| 85c8721 | 2005-04-29 16:23:29 +0100 | [diff] [blame] | 1 | /* audit.c -- Auditing support |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | * Gateway between the kernel (e.g., selinux) and the user-space audit daemon. |
| 3 | * System-call specific features have moved to auditsc.c |
| 4 | * |
Steve Grubb | 6a01b07 | 2007-01-19 14:39:55 -0500 | [diff] [blame] | 5 | * Copyright 2003-2007 Red Hat Inc., Durham, North Carolina. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | * All Rights Reserved. |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or |
| 11 | * (at your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, |
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | * GNU General Public License for more details. |
| 17 | * |
| 18 | * You should have received a copy of the GNU General Public License |
| 19 | * along with this program; if not, write to the Free Software |
| 20 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 21 | * |
| 22 | * Written by Rickard E. (Rik) Faith <faith@redhat.com> |
| 23 | * |
Ahmed S. Darwish | d7a96f3 | 2008-03-01 22:01:11 +0200 | [diff] [blame] | 24 | * Goals: 1) Integrate fully with Security Modules. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | * 2) Minimal run-time overhead: |
| 26 | * a) Minimal when syscall auditing is disabled (audit_enable=0). |
| 27 | * b) Small when syscall auditing is enabled and no audit record |
| 28 | * is generated (defer as much work as possible to record |
| 29 | * generation time): |
| 30 | * i) context is allocated, |
| 31 | * ii) names from getname are stored without a copy, and |
| 32 | * iii) inode information stored from path_lookup. |
| 33 | * 3) Ability to disable syscall auditing at boot time (audit=0). |
| 34 | * 4) Usable by other parts of the kernel (if audit_log* is called, |
| 35 | * then a syscall record will be generated automatically for the |
| 36 | * current syscall). |
| 37 | * 5) Netlink interface to user-space. |
| 38 | * 6) Support low-overhead kernel-based filtering to minimize the |
| 39 | * information that must be passed to user-space. |
| 40 | * |
| 85c8721 | 2005-04-29 16:23:29 +0100 | [diff] [blame] | 41 | * Example user-space utilities: http://people.redhat.com/sgrubb/audit/ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | */ |
| 43 | |
Joe Perches | d957f7b | 2014-01-14 10:33:12 -0800 | [diff] [blame] | 44 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 45 | |
Davidlohr Bueso | 5b28255 | 2015-02-22 18:20:09 -0800 | [diff] [blame] | 46 | #include <linux/file.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | #include <linux/init.h> |
Paul McQuade | 7153e40 | 2014-06-06 14:37:37 -0700 | [diff] [blame] | 48 | #include <linux/types.h> |
Arun Sharma | 60063497 | 2011-07-26 16:09:06 -0700 | [diff] [blame] | 49 | #include <linux/atomic.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | #include <linux/mm.h> |
Paul Gortmaker | 9984de1 | 2011-05-23 14:51:41 -0400 | [diff] [blame] | 51 | #include <linux/export.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 52 | #include <linux/slab.h> |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 53 | #include <linux/err.h> |
| 54 | #include <linux/kthread.h> |
Richard Guy Briggs | 46e959e | 2013-05-03 14:03:50 -0400 | [diff] [blame] | 55 | #include <linux/kernel.h> |
Eric Paris | b24a30a | 2013-04-30 15:30:32 -0400 | [diff] [blame] | 56 | #include <linux/syscalls.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | |
| 58 | #include <linux/audit.h> |
| 59 | |
| 60 | #include <net/sock.h> |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 61 | #include <net/netlink.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | #include <linux/skbuff.h> |
Mr Dash Four | 131ad62 | 2011-06-30 13:31:57 +0200 | [diff] [blame] | 63 | #ifdef CONFIG_SECURITY |
| 64 | #include <linux/security.h> |
| 65 | #endif |
Nigel Cunningham | 7dfb710 | 2006-12-06 20:34:23 -0800 | [diff] [blame] | 66 | #include <linux/freezer.h> |
Eric W. Biederman | 34e36d8 | 2012-09-10 23:20:20 -0700 | [diff] [blame] | 67 | #include <linux/pid_namespace.h> |
Richard Guy Briggs | 33faba7 | 2013-07-16 13:18:45 -0400 | [diff] [blame] | 68 | #include <net/netns/generic.h> |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 69 | |
| 70 | #include "audit.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | |
Eric Paris | a3f0711 | 2008-11-05 12:47:09 -0500 | [diff] [blame] | 72 | /* No auditing will take place until audit_initialized == AUDIT_INITIALIZED. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | * (Initialization happens after skb_init is called.) */ |
Eric Paris | a3f0711 | 2008-11-05 12:47:09 -0500 | [diff] [blame] | 74 | #define AUDIT_DISABLED -1 |
| 75 | #define AUDIT_UNINITIALIZED 0 |
| 76 | #define AUDIT_INITIALIZED 1 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | static int audit_initialized; |
| 78 | |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 79 | #define AUDIT_OFF 0 |
| 80 | #define AUDIT_ON 1 |
| 81 | #define AUDIT_LOCKED 2 |
Paul Moore | 93dedcf | 2017-09-01 09:44:34 -0400 | [diff] [blame] | 82 | u32 audit_enabled = AUDIT_OFF; |
| 83 | u32 audit_ever_enabled = !!AUDIT_OFF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | |
Jan Engelhardt | ae9d67af | 2011-01-18 06:48:12 +0100 | [diff] [blame] | 85 | EXPORT_SYMBOL_GPL(audit_enabled); |
| 86 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | /* Default state when kernel boots without any parameters. */ |
Paul Moore | 93dedcf | 2017-09-01 09:44:34 -0400 | [diff] [blame] | 88 | static u32 audit_default = AUDIT_OFF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | |
| 90 | /* If auditing cannot proceed, audit_failure selects what happens. */ |
Joe Perches | 3e1d0bb | 2014-01-14 10:33:13 -0800 | [diff] [blame] | 91 | static u32 audit_failure = AUDIT_FAIL_PRINTK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | |
Pavel Emelyanov | 75c0371 | 2008-03-20 15:39:41 -0700 | [diff] [blame] | 93 | /* |
| 94 | * If audit records are to be written to the netlink socket, audit_pid |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 95 | * contains the pid of the auditd process and audit_nlk_portid contains |
| 96 | * the portid to use to send netlink messages to that process. |
Pavel Emelyanov | 75c0371 | 2008-03-20 15:39:41 -0700 | [diff] [blame] | 97 | */ |
Steve Grubb | c2f0c7c | 2005-05-06 12:38:39 +0100 | [diff] [blame] | 98 | int audit_pid; |
Richard Guy Briggs | f944163 | 2013-08-14 11:32:45 -0400 | [diff] [blame] | 99 | static __u32 audit_nlk_portid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 101 | /* If audit_rate_limit is non-zero, limit the rate of sending audit records |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | * to that number per second. This prevents DoS attacks, but results in |
| 103 | * audit records being dropped. */ |
Joe Perches | 3e1d0bb | 2014-01-14 10:33:13 -0800 | [diff] [blame] | 104 | static u32 audit_rate_limit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | |
Richard Guy Briggs | 40c0775 | 2013-10-22 13:28:49 -0400 | [diff] [blame] | 106 | /* Number of outstanding audit_buffers allowed. |
| 107 | * When set to zero, this means unlimited. */ |
Joe Perches | 3e1d0bb | 2014-01-14 10:33:13 -0800 | [diff] [blame] | 108 | static u32 audit_backlog_limit = 64; |
Richard Guy Briggs | e789e56 | 2013-09-12 23:03:51 -0400 | [diff] [blame] | 109 | #define AUDIT_BACKLOG_WAIT_TIME (60 * HZ) |
Richard Guy Briggs | a77ed4e | 2015-02-23 15:37:59 -0500 | [diff] [blame] | 110 | static u32 audit_backlog_wait_time_master = AUDIT_BACKLOG_WAIT_TIME; |
Joe Perches | 3e1d0bb | 2014-01-14 10:33:13 -0800 | [diff] [blame] | 111 | static u32 audit_backlog_wait_time = AUDIT_BACKLOG_WAIT_TIME; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | |
Steve Grubb | c2f0c7c | 2005-05-06 12:38:39 +0100 | [diff] [blame] | 113 | /* The identity of the user shutting down the audit system. */ |
Eric W. Biederman | cca080d | 2012-02-07 16:53:48 -0800 | [diff] [blame] | 114 | kuid_t audit_sig_uid = INVALID_UID; |
Steve Grubb | c2f0c7c | 2005-05-06 12:38:39 +0100 | [diff] [blame] | 115 | pid_t audit_sig_pid = -1; |
Al Viro | e139606 | 2006-05-25 10:19:47 -0400 | [diff] [blame] | 116 | u32 audit_sig_sid = 0; |
Steve Grubb | c2f0c7c | 2005-05-06 12:38:39 +0100 | [diff] [blame] | 117 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | /* Records can be lost in several ways: |
| 119 | 0) [suppressed in audit_alloc] |
| 120 | 1) out of memory in audit_log_start [kmalloc of struct audit_buffer] |
| 121 | 2) out of memory in audit_log_move [alloc_skb] |
| 122 | 3) suppressed due to audit_rate_limit |
| 123 | 4) suppressed due to audit_backlog_limit |
| 124 | */ |
| 125 | static atomic_t audit_lost = ATOMIC_INIT(0); |
| 126 | |
| 127 | /* The netlink socket. */ |
Teng Fei Fan | a4f1356 | 2018-10-15 14:02:39 +0800 | [diff] [blame] | 128 | static DEFINE_MUTEX(audit_sock_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | static struct sock *audit_sock; |
Richard Guy Briggs | c0a8d9b | 2014-05-26 10:59:28 -0400 | [diff] [blame] | 130 | static int audit_net_id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 132 | /* Hash for inode-based rules */ |
| 133 | struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS]; |
| 134 | |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 135 | /* The audit_freelist is a list of pre-allocated audit buffers (if more |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | * than AUDIT_MAXFREE are in use, the audit buffer is freed instead of |
| 137 | * being placed on the freelist). */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | static DEFINE_SPINLOCK(audit_freelist_lock); |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 139 | static int audit_freelist_count; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | static LIST_HEAD(audit_freelist); |
| 141 | |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 142 | static struct sk_buff_head audit_skb_queue; |
Eric Paris | f3d357b | 2008-04-18 10:02:28 -0400 | [diff] [blame] | 143 | /* queue of skbs to send to auditd when/if it comes back */ |
| 144 | static struct sk_buff_head audit_skb_hold_queue; |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 145 | static struct task_struct *kauditd_task; |
| 146 | static DECLARE_WAIT_QUEUE_HEAD(kauditd_wait); |
David Woodhouse | 9ad9ad3 | 2005-06-22 15:04:33 +0100 | [diff] [blame] | 147 | static DECLARE_WAIT_QUEUE_HEAD(audit_backlog_wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | |
Eric Paris | b0fed40 | 2013-05-22 12:54:49 -0400 | [diff] [blame] | 149 | static struct audit_features af = {.vers = AUDIT_FEATURE_VERSION, |
| 150 | .mask = -1, |
| 151 | .features = 0, |
| 152 | .lock = 0,}; |
| 153 | |
Eric Paris | 21b85c3 | 2013-05-23 14:26:00 -0400 | [diff] [blame] | 154 | static char *audit_feature_names[2] = { |
Eric Paris | d040e5a | 2013-05-24 09:18:04 -0400 | [diff] [blame] | 155 | "only_unset_loginuid", |
Eric Paris | 21b85c3 | 2013-05-23 14:26:00 -0400 | [diff] [blame] | 156 | "loginuid_immutable", |
Eric Paris | b0fed40 | 2013-05-22 12:54:49 -0400 | [diff] [blame] | 157 | }; |
| 158 | |
| 159 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 160 | /* Serialize requests from userspace. */ |
Al Viro | 916d757 | 2009-06-24 00:02:38 -0400 | [diff] [blame] | 161 | DEFINE_MUTEX(audit_cmd_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | |
| 163 | /* AUDIT_BUFSIZ is the size of the temporary buffer used for formatting |
| 164 | * audit records. Since printk uses a 1024 byte buffer, this buffer |
| 165 | * should be at least that large. */ |
| 166 | #define AUDIT_BUFSIZ 1024 |
| 167 | |
| 168 | /* AUDIT_MAXFREE is the number of empty audit_buffers we keep on the |
| 169 | * audit_freelist. Doing so eliminates many kmalloc/kfree calls. */ |
| 170 | #define AUDIT_MAXFREE (2*NR_CPUS) |
| 171 | |
| 172 | /* The audit_buffer is used when formatting an audit record. The caller |
| 173 | * locks briefly to get the record off the freelist or to allocate the |
| 174 | * buffer, and locks briefly to send the buffer to the netlink layer or |
| 175 | * to place it on a transmit queue. Multiple audit_buffers can be in |
| 176 | * use simultaneously. */ |
| 177 | struct audit_buffer { |
| 178 | struct list_head list; |
Chris Wright | 8fc6115 | 2005-05-06 15:54:17 +0100 | [diff] [blame] | 179 | struct sk_buff *skb; /* formatted skb ready to send */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | struct audit_context *ctx; /* NULL or associated context */ |
Al Viro | 9796fdd | 2005-10-21 03:22:03 -0400 | [diff] [blame] | 181 | gfp_t gfp_mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | }; |
| 183 | |
Eric Paris | f09ac9d | 2008-04-18 10:11:04 -0400 | [diff] [blame] | 184 | struct audit_reply { |
Richard Guy Briggs | f944163 | 2013-08-14 11:32:45 -0400 | [diff] [blame] | 185 | __u32 portid; |
Eric W. Biederman | 638a0fd | 2014-02-28 10:49:05 -0800 | [diff] [blame] | 186 | struct net *net; |
Eric Paris | f09ac9d | 2008-04-18 10:11:04 -0400 | [diff] [blame] | 187 | struct sk_buff *skb; |
| 188 | }; |
| 189 | |
Richard Guy Briggs | f944163 | 2013-08-14 11:32:45 -0400 | [diff] [blame] | 190 | static void audit_set_portid(struct audit_buffer *ab, __u32 portid) |
Steve Grubb | c040499 | 2005-05-13 18:17:42 +0100 | [diff] [blame] | 191 | { |
Eric Paris | 50397bd | 2008-01-07 18:14:19 -0500 | [diff] [blame] | 192 | if (ab) { |
| 193 | struct nlmsghdr *nlh = nlmsg_hdr(ab->skb); |
Richard Guy Briggs | f944163 | 2013-08-14 11:32:45 -0400 | [diff] [blame] | 194 | nlh->nlmsg_pid = portid; |
Eric Paris | 50397bd | 2008-01-07 18:14:19 -0500 | [diff] [blame] | 195 | } |
Steve Grubb | c040499 | 2005-05-13 18:17:42 +0100 | [diff] [blame] | 196 | } |
| 197 | |
Dustin Kirkland | 8c8570f | 2005-11-03 17:15:16 +0000 | [diff] [blame] | 198 | void audit_panic(const char *message) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | { |
Joe Perches | d957f7b | 2014-01-14 10:33:12 -0800 | [diff] [blame] | 200 | switch (audit_failure) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | case AUDIT_FAIL_SILENT: |
| 202 | break; |
| 203 | case AUDIT_FAIL_PRINTK: |
Eric Paris | 320f1b1 | 2008-01-23 22:55:05 -0500 | [diff] [blame] | 204 | if (printk_ratelimit()) |
Joe Perches | d957f7b | 2014-01-14 10:33:12 -0800 | [diff] [blame] | 205 | pr_err("%s\n", message); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | break; |
| 207 | case AUDIT_FAIL_PANIC: |
Eric Paris | b29ee87 | 2008-02-21 15:53:05 -0500 | [diff] [blame] | 208 | /* test audit_pid since printk is always losey, why bother? */ |
| 209 | if (audit_pid) |
| 210 | panic("audit: %s\n", message); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | break; |
| 212 | } |
| 213 | } |
| 214 | |
| 215 | static inline int audit_rate_check(void) |
| 216 | { |
| 217 | static unsigned long last_check = 0; |
| 218 | static int messages = 0; |
| 219 | static DEFINE_SPINLOCK(lock); |
| 220 | unsigned long flags; |
| 221 | unsigned long now; |
| 222 | unsigned long elapsed; |
| 223 | int retval = 0; |
| 224 | |
| 225 | if (!audit_rate_limit) return 1; |
| 226 | |
| 227 | spin_lock_irqsave(&lock, flags); |
| 228 | if (++messages < audit_rate_limit) { |
| 229 | retval = 1; |
| 230 | } else { |
| 231 | now = jiffies; |
| 232 | elapsed = now - last_check; |
| 233 | if (elapsed > HZ) { |
| 234 | last_check = now; |
| 235 | messages = 0; |
| 236 | retval = 1; |
| 237 | } |
| 238 | } |
| 239 | spin_unlock_irqrestore(&lock, flags); |
| 240 | |
| 241 | return retval; |
| 242 | } |
| 243 | |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 244 | /** |
| 245 | * audit_log_lost - conditionally log lost audit message event |
| 246 | * @message: the message stating reason for lost audit message |
| 247 | * |
| 248 | * Emit at least 1 message per second, even if audit_rate_check is |
| 249 | * throttling. |
| 250 | * Always increment the lost messages counter. |
| 251 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | void audit_log_lost(const char *message) |
| 253 | { |
| 254 | static unsigned long last_msg = 0; |
| 255 | static DEFINE_SPINLOCK(lock); |
| 256 | unsigned long flags; |
| 257 | unsigned long now; |
| 258 | int print; |
| 259 | |
| 260 | atomic_inc(&audit_lost); |
| 261 | |
| 262 | print = (audit_failure == AUDIT_FAIL_PANIC || !audit_rate_limit); |
| 263 | |
| 264 | if (!print) { |
| 265 | spin_lock_irqsave(&lock, flags); |
| 266 | now = jiffies; |
| 267 | if (now - last_msg > HZ) { |
| 268 | print = 1; |
| 269 | last_msg = now; |
| 270 | } |
| 271 | spin_unlock_irqrestore(&lock, flags); |
| 272 | } |
| 273 | |
| 274 | if (print) { |
Eric Paris | 320f1b1 | 2008-01-23 22:55:05 -0500 | [diff] [blame] | 275 | if (printk_ratelimit()) |
Joe Perches | 3e1d0bb | 2014-01-14 10:33:13 -0800 | [diff] [blame] | 276 | pr_warn("audit_lost=%u audit_rate_limit=%u audit_backlog_limit=%u\n", |
Eric Paris | 320f1b1 | 2008-01-23 22:55:05 -0500 | [diff] [blame] | 277 | atomic_read(&audit_lost), |
| 278 | audit_rate_limit, |
| 279 | audit_backlog_limit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | audit_panic(message); |
| 281 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | } |
| 283 | |
Joe Perches | 3e1d0bb | 2014-01-14 10:33:13 -0800 | [diff] [blame] | 284 | static int audit_log_config_change(char *function_name, u32 new, u32 old, |
Eric Paris | 2532386 | 2008-04-18 10:09:25 -0400 | [diff] [blame] | 285 | int allow_changes) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | { |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 287 | struct audit_buffer *ab; |
| 288 | int rc = 0; |
Steve Grubb | 6a01b07 | 2007-01-19 14:39:55 -0500 | [diff] [blame] | 289 | |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 290 | ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE); |
Kees Cook | 0644ec0 | 2013-01-11 14:32:07 -0800 | [diff] [blame] | 291 | if (unlikely(!ab)) |
| 292 | return rc; |
Joe Perches | 3e1d0bb | 2014-01-14 10:33:13 -0800 | [diff] [blame] | 293 | audit_log_format(ab, "%s=%u old=%u", function_name, new, old); |
Eric Paris | 4d3fb70 | 2013-04-30 09:53:34 -0400 | [diff] [blame] | 294 | audit_log_session_info(ab); |
Eric Paris | b122c37 | 2013-04-19 15:00:33 -0400 | [diff] [blame] | 295 | rc = audit_log_task_context(ab); |
| 296 | if (rc) |
| 297 | allow_changes = 0; /* Something weird, deny request */ |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 298 | audit_log_format(ab, " res=%d", allow_changes); |
| 299 | audit_log_end(ab); |
| 300 | return rc; |
| 301 | } |
| 302 | |
Joe Perches | 3e1d0bb | 2014-01-14 10:33:13 -0800 | [diff] [blame] | 303 | static int audit_do_config_change(char *function_name, u32 *to_change, u32 new) |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 304 | { |
Joe Perches | 3e1d0bb | 2014-01-14 10:33:13 -0800 | [diff] [blame] | 305 | int allow_changes, rc = 0; |
| 306 | u32 old = *to_change; |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 307 | |
| 308 | /* check if we are locked */ |
| 309 | if (audit_enabled == AUDIT_LOCKED) |
| 310 | allow_changes = 0; |
| 311 | else |
| 312 | allow_changes = 1; |
| 313 | |
| 314 | if (audit_enabled != AUDIT_OFF) { |
Eric Paris | dc9eb69 | 2013-04-19 13:23:09 -0400 | [diff] [blame] | 315 | rc = audit_log_config_change(function_name, new, old, allow_changes); |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 316 | if (rc) |
| 317 | allow_changes = 0; |
| 318 | } |
Steve Grubb | 6a01b07 | 2007-01-19 14:39:55 -0500 | [diff] [blame] | 319 | |
| 320 | /* If we are allowed, make the change */ |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 321 | if (allow_changes == 1) |
| 322 | *to_change = new; |
Steve Grubb | 6a01b07 | 2007-01-19 14:39:55 -0500 | [diff] [blame] | 323 | /* Not allowed, update reason */ |
| 324 | else if (rc == 0) |
| 325 | rc = -EPERM; |
| 326 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | } |
| 328 | |
Joe Perches | 3e1d0bb | 2014-01-14 10:33:13 -0800 | [diff] [blame] | 329 | static int audit_set_rate_limit(u32 limit) |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 330 | { |
Eric Paris | dc9eb69 | 2013-04-19 13:23:09 -0400 | [diff] [blame] | 331 | return audit_do_config_change("audit_rate_limit", &audit_rate_limit, limit); |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 332 | } |
| 333 | |
Joe Perches | 3e1d0bb | 2014-01-14 10:33:13 -0800 | [diff] [blame] | 334 | static int audit_set_backlog_limit(u32 limit) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | { |
Eric Paris | dc9eb69 | 2013-04-19 13:23:09 -0400 | [diff] [blame] | 336 | return audit_do_config_change("audit_backlog_limit", &audit_backlog_limit, limit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | } |
| 338 | |
Joe Perches | 3e1d0bb | 2014-01-14 10:33:13 -0800 | [diff] [blame] | 339 | static int audit_set_backlog_wait_time(u32 timeout) |
Richard Guy Briggs | 51cc83f | 2013-09-18 11:55:12 -0400 | [diff] [blame] | 340 | { |
| 341 | return audit_do_config_change("audit_backlog_wait_time", |
Richard Guy Briggs | a77ed4e | 2015-02-23 15:37:59 -0500 | [diff] [blame] | 342 | &audit_backlog_wait_time_master, timeout); |
Richard Guy Briggs | 51cc83f | 2013-09-18 11:55:12 -0400 | [diff] [blame] | 343 | } |
| 344 | |
Joe Perches | 3e1d0bb | 2014-01-14 10:33:13 -0800 | [diff] [blame] | 345 | static int audit_set_enabled(u32 state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | { |
Eric Paris | b593d38 | 2008-01-08 17:38:31 -0500 | [diff] [blame] | 347 | int rc; |
Pranith Kumar | 724e7bf | 2015-03-11 14:08:19 -0400 | [diff] [blame] | 348 | if (state > AUDIT_LOCKED) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | return -EINVAL; |
Steve Grubb | ce29b68 | 2006-04-01 18:29:34 -0500 | [diff] [blame] | 350 | |
Eric Paris | dc9eb69 | 2013-04-19 13:23:09 -0400 | [diff] [blame] | 351 | rc = audit_do_config_change("audit_enabled", &audit_enabled, state); |
Eric Paris | b593d38 | 2008-01-08 17:38:31 -0500 | [diff] [blame] | 352 | if (!rc) |
| 353 | audit_ever_enabled |= !!state; |
| 354 | |
| 355 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | } |
| 357 | |
Joe Perches | 3e1d0bb | 2014-01-14 10:33:13 -0800 | [diff] [blame] | 358 | static int audit_set_failure(u32 state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | if (state != AUDIT_FAIL_SILENT |
| 361 | && state != AUDIT_FAIL_PRINTK |
| 362 | && state != AUDIT_FAIL_PANIC) |
| 363 | return -EINVAL; |
Steve Grubb | ce29b68 | 2006-04-01 18:29:34 -0500 | [diff] [blame] | 364 | |
Eric Paris | dc9eb69 | 2013-04-19 13:23:09 -0400 | [diff] [blame] | 365 | return audit_do_config_change("audit_failure", &audit_failure, state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | } |
| 367 | |
Eric Paris | f3d357b | 2008-04-18 10:02:28 -0400 | [diff] [blame] | 368 | /* |
| 369 | * Queue skbs to be sent to auditd when/if it comes back. These skbs should |
| 370 | * already have been sent via prink/syslog and so if these messages are dropped |
| 371 | * it is not a huge concern since we already passed the audit_log_lost() |
| 372 | * notification and stuff. This is just nice to get audit messages during |
| 373 | * boot before auditd is running or messages generated while auditd is stopped. |
| 374 | * This only holds messages is audit_default is set, aka booting with audit=1 |
| 375 | * or building your kernel that way. |
| 376 | */ |
| 377 | static void audit_hold_skb(struct sk_buff *skb) |
| 378 | { |
| 379 | if (audit_default && |
Richard Guy Briggs | 40c0775 | 2013-10-22 13:28:49 -0400 | [diff] [blame] | 380 | (!audit_backlog_limit || |
| 381 | skb_queue_len(&audit_skb_hold_queue) < audit_backlog_limit)) |
Eric Paris | f3d357b | 2008-04-18 10:02:28 -0400 | [diff] [blame] | 382 | skb_queue_tail(&audit_skb_hold_queue, skb); |
| 383 | else |
| 384 | kfree_skb(skb); |
| 385 | } |
| 386 | |
Eric Paris | 038cbcf | 2009-06-11 14:31:35 -0400 | [diff] [blame] | 387 | /* |
| 388 | * For one reason or another this nlh isn't getting delivered to the userspace |
| 389 | * audit daemon, just send it to printk. |
| 390 | */ |
| 391 | static void audit_printk_skb(struct sk_buff *skb) |
| 392 | { |
| 393 | struct nlmsghdr *nlh = nlmsg_hdr(skb); |
David S. Miller | c64e66c | 2012-06-26 21:45:21 -0700 | [diff] [blame] | 394 | char *data = nlmsg_data(nlh); |
Eric Paris | 038cbcf | 2009-06-11 14:31:35 -0400 | [diff] [blame] | 395 | |
| 396 | if (nlh->nlmsg_type != AUDIT_EOE) { |
| 397 | if (printk_ratelimit()) |
Joe Perches | d957f7b | 2014-01-14 10:33:12 -0800 | [diff] [blame] | 398 | pr_notice("type=%d %s\n", nlh->nlmsg_type, data); |
Eric Paris | 038cbcf | 2009-06-11 14:31:35 -0400 | [diff] [blame] | 399 | else |
Josh Boyer | f128352 | 2014-03-05 16:29:55 -0500 | [diff] [blame] | 400 | audit_log_lost("printk limit exceeded"); |
Eric Paris | 038cbcf | 2009-06-11 14:31:35 -0400 | [diff] [blame] | 401 | } |
| 402 | |
| 403 | audit_hold_skb(skb); |
| 404 | } |
| 405 | |
Eric Paris | f3d357b | 2008-04-18 10:02:28 -0400 | [diff] [blame] | 406 | static void kauditd_send_skb(struct sk_buff *skb) |
| 407 | { |
| 408 | int err; |
Richard Guy Briggs | 32a1dba | 2015-11-04 08:23:50 -0500 | [diff] [blame] | 409 | int attempts = 0; |
| 410 | #define AUDITD_RETRIES 5 |
| 411 | |
| 412 | restart: |
Eric Paris | f3d357b | 2008-04-18 10:02:28 -0400 | [diff] [blame] | 413 | /* take a reference in case we can't send it and we want to hold it */ |
| 414 | skb_get(skb); |
Teng Fei Fan | a4f1356 | 2018-10-15 14:02:39 +0800 | [diff] [blame] | 415 | mutex_lock(&audit_sock_mutex); |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 416 | err = netlink_unicast(audit_sock, skb, audit_nlk_portid, 0); |
Teng Fei Fan | a4f1356 | 2018-10-15 14:02:39 +0800 | [diff] [blame] | 417 | mutex_unlock(&audit_sock_mutex); |
Eric Paris | f3d357b | 2008-04-18 10:02:28 -0400 | [diff] [blame] | 418 | if (err < 0) { |
Richard Guy Briggs | 32a1dba | 2015-11-04 08:23:50 -0500 | [diff] [blame] | 419 | pr_err("netlink_unicast sending to audit_pid=%d returned error: %d\n", |
| 420 | audit_pid, err); |
Richard Guy Briggs | 04ee1a3 | 2013-11-26 18:49:12 -0500 | [diff] [blame] | 421 | if (audit_pid) { |
Richard Guy Briggs | 32a1dba | 2015-11-04 08:23:50 -0500 | [diff] [blame] | 422 | if (err == -ECONNREFUSED || err == -EPERM |
| 423 | || ++attempts >= AUDITD_RETRIES) { |
| 424 | char s[32]; |
| 425 | |
| 426 | snprintf(s, sizeof(s), "audit_pid=%d reset", audit_pid); |
| 427 | audit_log_lost(s); |
| 428 | audit_pid = 0; |
Teng Fei Fan | a4f1356 | 2018-10-15 14:02:39 +0800 | [diff] [blame] | 429 | mutex_lock(&audit_sock_mutex); |
Richard Guy Briggs | 32a1dba | 2015-11-04 08:23:50 -0500 | [diff] [blame] | 430 | audit_sock = NULL; |
Teng Fei Fan | a4f1356 | 2018-10-15 14:02:39 +0800 | [diff] [blame] | 431 | mutex_unlock(&audit_sock_mutex); |
Richard Guy Briggs | 32a1dba | 2015-11-04 08:23:50 -0500 | [diff] [blame] | 432 | } else { |
| 433 | pr_warn("re-scheduling(#%d) write to audit_pid=%d\n", |
| 434 | attempts, audit_pid); |
| 435 | set_current_state(TASK_INTERRUPTIBLE); |
| 436 | schedule(); |
Richard Guy Briggs | 32a1dba | 2015-11-04 08:23:50 -0500 | [diff] [blame] | 437 | goto restart; |
| 438 | } |
Richard Guy Briggs | 04ee1a3 | 2013-11-26 18:49:12 -0500 | [diff] [blame] | 439 | } |
Eric Paris | f3d357b | 2008-04-18 10:02:28 -0400 | [diff] [blame] | 440 | /* we might get lucky and get this in the next auditd */ |
| 441 | audit_hold_skb(skb); |
| 442 | } else |
| 443 | /* drop the extra reference if sent ok */ |
Neil Horman | 70d4bf6 | 2010-07-20 06:45:56 +0000 | [diff] [blame] | 444 | consume_skb(skb); |
Eric Paris | f3d357b | 2008-04-18 10:02:28 -0400 | [diff] [blame] | 445 | } |
| 446 | |
Richard Guy Briggs | b551d1d | 2013-01-24 13:15:10 -0500 | [diff] [blame] | 447 | /* |
Richard Guy Briggs | 451f921 | 2014-04-22 21:31:57 -0400 | [diff] [blame] | 448 | * kauditd_send_multicast_skb - send the skb to multicast userspace listeners |
| 449 | * |
| 450 | * This function doesn't consume an skb as might be expected since it has to |
| 451 | * copy it anyways. |
| 452 | */ |
Richard Guy Briggs | 54dc77d | 2014-12-18 23:09:27 -0500 | [diff] [blame] | 453 | static void kauditd_send_multicast_skb(struct sk_buff *skb, gfp_t gfp_mask) |
Richard Guy Briggs | 451f921 | 2014-04-22 21:31:57 -0400 | [diff] [blame] | 454 | { |
| 455 | struct sk_buff *copy; |
| 456 | struct audit_net *aunet = net_generic(&init_net, audit_net_id); |
| 457 | struct sock *sock = aunet->nlsk; |
| 458 | |
Richard Guy Briggs | 7f74ecd | 2014-04-22 21:31:58 -0400 | [diff] [blame] | 459 | if (!netlink_has_listeners(sock, AUDIT_NLGRP_READLOG)) |
| 460 | return; |
| 461 | |
Richard Guy Briggs | 451f921 | 2014-04-22 21:31:57 -0400 | [diff] [blame] | 462 | /* |
| 463 | * The seemingly wasteful skb_copy() rather than bumping the refcount |
| 464 | * using skb_get() is necessary because non-standard mods are made to |
| 465 | * the skb by the original kaudit unicast socket send routine. The |
| 466 | * existing auditd daemon assumes this breakage. Fixing this would |
| 467 | * require co-ordinating a change in the established protocol between |
| 468 | * the kaudit kernel subsystem and the auditd userspace code. There is |
| 469 | * no reason for new multicast clients to continue with this |
| 470 | * non-compliance. |
| 471 | */ |
Richard Guy Briggs | 54dc77d | 2014-12-18 23:09:27 -0500 | [diff] [blame] | 472 | copy = skb_copy(skb, gfp_mask); |
Richard Guy Briggs | 451f921 | 2014-04-22 21:31:57 -0400 | [diff] [blame] | 473 | if (!copy) |
| 474 | return; |
| 475 | |
Richard Guy Briggs | 54dc77d | 2014-12-18 23:09:27 -0500 | [diff] [blame] | 476 | nlmsg_multicast(sock, copy, 0, AUDIT_NLGRP_READLOG, gfp_mask); |
Richard Guy Briggs | 451f921 | 2014-04-22 21:31:57 -0400 | [diff] [blame] | 477 | } |
| 478 | |
| 479 | /* |
Richard Guy Briggs | b551d1d | 2013-01-24 13:15:10 -0500 | [diff] [blame] | 480 | * flush_hold_queue - empty the hold queue if auditd appears |
| 481 | * |
| 482 | * If auditd just started, drain the queue of messages already |
| 483 | * sent to syslog/printk. Remember loss here is ok. We already |
| 484 | * called audit_log_lost() if it didn't go out normally. so the |
| 485 | * race between the skb_dequeue and the next check for audit_pid |
| 486 | * doesn't matter. |
| 487 | * |
| 488 | * If you ever find kauditd to be too slow we can get a perf win |
| 489 | * by doing our own locking and keeping better track if there |
| 490 | * are messages in this queue. I don't see the need now, but |
| 491 | * in 5 years when I want to play with this again I'll see this |
| 492 | * note and still have no friggin idea what i'm thinking today. |
| 493 | */ |
| 494 | static void flush_hold_queue(void) |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 495 | { |
| 496 | struct sk_buff *skb; |
| 497 | |
Richard Guy Briggs | b551d1d | 2013-01-24 13:15:10 -0500 | [diff] [blame] | 498 | if (!audit_default || !audit_pid) |
| 499 | return; |
| 500 | |
| 501 | skb = skb_dequeue(&audit_skb_hold_queue); |
| 502 | if (likely(!skb)) |
| 503 | return; |
| 504 | |
| 505 | while (skb && audit_pid) { |
| 506 | kauditd_send_skb(skb); |
| 507 | skb = skb_dequeue(&audit_skb_hold_queue); |
| 508 | } |
| 509 | |
| 510 | /* |
| 511 | * if auditd just disappeared but we |
| 512 | * dequeued an skb we need to drop ref |
| 513 | */ |
Markus Elfring | d865e57 | 2016-01-13 09:18:55 -0500 | [diff] [blame] | 514 | consume_skb(skb); |
Richard Guy Briggs | b551d1d | 2013-01-24 13:15:10 -0500 | [diff] [blame] | 515 | } |
| 516 | |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 517 | static int kauditd_thread(void *dummy) |
| 518 | { |
Rafael J. Wysocki | 8314418 | 2007-07-17 04:03:35 -0700 | [diff] [blame] | 519 | set_freezable(); |
Andrew Morton | 4899b8b | 2006-10-06 00:43:48 -0700 | [diff] [blame] | 520 | while (!kthread_should_stop()) { |
Richard Guy Briggs | 3320c51 | 2013-01-24 13:15:11 -0500 | [diff] [blame] | 521 | struct sk_buff *skb; |
Richard Guy Briggs | 3320c51 | 2013-01-24 13:15:11 -0500 | [diff] [blame] | 522 | |
Richard Guy Briggs | b551d1d | 2013-01-24 13:15:10 -0500 | [diff] [blame] | 523 | flush_hold_queue(); |
Eric Paris | f3d357b | 2008-04-18 10:02:28 -0400 | [diff] [blame] | 524 | |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 525 | skb = skb_dequeue(&audit_skb_queue); |
Dan Duval | db89731 | 2013-09-16 11:11:12 -0400 | [diff] [blame] | 526 | |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 527 | if (skb) { |
Richard Guy Briggs | 1194b99 | 2016-01-13 09:18:54 -0500 | [diff] [blame] | 528 | if (!audit_backlog_limit || |
| 529 | (skb_queue_len(&audit_skb_queue) <= audit_backlog_limit)) |
Dan Duval | db89731 | 2013-09-16 11:11:12 -0400 | [diff] [blame] | 530 | wake_up(&audit_backlog_wait); |
Eric Paris | f3d357b | 2008-04-18 10:02:28 -0400 | [diff] [blame] | 531 | if (audit_pid) |
| 532 | kauditd_send_skb(skb); |
Eric Paris | 038cbcf | 2009-06-11 14:31:35 -0400 | [diff] [blame] | 533 | else |
| 534 | audit_printk_skb(skb); |
Richard Guy Briggs | 3320c51 | 2013-01-24 13:15:11 -0500 | [diff] [blame] | 535 | continue; |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 536 | } |
Richard Guy Briggs | 3320c51 | 2013-01-24 13:15:11 -0500 | [diff] [blame] | 537 | |
Peter Zijlstra | 6b55fc6 | 2014-10-02 12:22:51 +0200 | [diff] [blame] | 538 | wait_event_freezable(kauditd_wait, skb_queue_len(&audit_skb_queue)); |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 539 | } |
Andrew Morton | 4899b8b | 2006-10-06 00:43:48 -0700 | [diff] [blame] | 540 | return 0; |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 541 | } |
| 542 | |
Paul Moore | 249293b | 2020-04-21 09:10:56 -0400 | [diff] [blame] | 543 | int audit_send_list_thread(void *_dest) |
Al Viro | 9044e6b | 2006-05-22 01:09:24 -0400 | [diff] [blame] | 544 | { |
| 545 | struct audit_netlink_list *dest = _dest; |
Al Viro | 9044e6b | 2006-05-22 01:09:24 -0400 | [diff] [blame] | 546 | struct sk_buff *skb; |
Eric W. Biederman | 48095d9 | 2014-02-03 17:25:33 -0800 | [diff] [blame] | 547 | struct net *net = dest->net; |
Richard Guy Briggs | 33faba7 | 2013-07-16 13:18:45 -0400 | [diff] [blame] | 548 | struct audit_net *aunet = net_generic(net, audit_net_id); |
Al Viro | 9044e6b | 2006-05-22 01:09:24 -0400 | [diff] [blame] | 549 | |
| 550 | /* wait for parent to finish and send an ACK */ |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 551 | mutex_lock(&audit_cmd_mutex); |
| 552 | mutex_unlock(&audit_cmd_mutex); |
Al Viro | 9044e6b | 2006-05-22 01:09:24 -0400 | [diff] [blame] | 553 | |
| 554 | while ((skb = __skb_dequeue(&dest->q)) != NULL) |
Richard Guy Briggs | 33faba7 | 2013-07-16 13:18:45 -0400 | [diff] [blame] | 555 | netlink_unicast(aunet->nlsk, skb, dest->portid, 0); |
Al Viro | 9044e6b | 2006-05-22 01:09:24 -0400 | [diff] [blame] | 556 | |
Eric W. Biederman | 48095d9 | 2014-02-03 17:25:33 -0800 | [diff] [blame] | 557 | put_net(net); |
Al Viro | 9044e6b | 2006-05-22 01:09:24 -0400 | [diff] [blame] | 558 | kfree(dest); |
| 559 | |
| 560 | return 0; |
| 561 | } |
| 562 | |
Richard Guy Briggs | f944163 | 2013-08-14 11:32:45 -0400 | [diff] [blame] | 563 | struct sk_buff *audit_make_reply(__u32 portid, int seq, int type, int done, |
Stephen Hemminger | b8800aa | 2010-10-20 17:23:50 -0700 | [diff] [blame] | 564 | int multi, const void *payload, int size) |
Al Viro | 9044e6b | 2006-05-22 01:09:24 -0400 | [diff] [blame] | 565 | { |
| 566 | struct sk_buff *skb; |
| 567 | struct nlmsghdr *nlh; |
Al Viro | 9044e6b | 2006-05-22 01:09:24 -0400 | [diff] [blame] | 568 | void *data; |
| 569 | int flags = multi ? NLM_F_MULTI : 0; |
| 570 | int t = done ? NLMSG_DONE : type; |
| 571 | |
Eric Paris | ee080e6 | 2009-06-11 14:31:35 -0400 | [diff] [blame] | 572 | skb = nlmsg_new(size, GFP_KERNEL); |
Al Viro | 9044e6b | 2006-05-22 01:09:24 -0400 | [diff] [blame] | 573 | if (!skb) |
| 574 | return NULL; |
| 575 | |
Richard Guy Briggs | f944163 | 2013-08-14 11:32:45 -0400 | [diff] [blame] | 576 | nlh = nlmsg_put(skb, portid, seq, t, size, flags); |
David S. Miller | c64e66c | 2012-06-26 21:45:21 -0700 | [diff] [blame] | 577 | if (!nlh) |
| 578 | goto out_kfree_skb; |
| 579 | data = nlmsg_data(nlh); |
Al Viro | 9044e6b | 2006-05-22 01:09:24 -0400 | [diff] [blame] | 580 | memcpy(data, payload, size); |
| 581 | return skb; |
| 582 | |
David S. Miller | c64e66c | 2012-06-26 21:45:21 -0700 | [diff] [blame] | 583 | out_kfree_skb: |
| 584 | kfree_skb(skb); |
Al Viro | 9044e6b | 2006-05-22 01:09:24 -0400 | [diff] [blame] | 585 | return NULL; |
| 586 | } |
| 587 | |
Paul Moore | 61ec5d8 | 2020-04-20 10:09:29 -0400 | [diff] [blame] | 588 | static void audit_free_reply(struct audit_reply *reply) |
| 589 | { |
| 590 | if (!reply) |
| 591 | return; |
| 592 | |
| 593 | if (reply->skb) |
| 594 | kfree_skb(reply->skb); |
| 595 | if (reply->net) |
| 596 | put_net(reply->net); |
| 597 | kfree(reply); |
| 598 | } |
| 599 | |
Eric Paris | f09ac9d | 2008-04-18 10:11:04 -0400 | [diff] [blame] | 600 | static int audit_send_reply_thread(void *arg) |
| 601 | { |
| 602 | struct audit_reply *reply = (struct audit_reply *)arg; |
Eric W. Biederman | 48095d9 | 2014-02-03 17:25:33 -0800 | [diff] [blame] | 603 | struct net *net = reply->net; |
Richard Guy Briggs | 33faba7 | 2013-07-16 13:18:45 -0400 | [diff] [blame] | 604 | struct audit_net *aunet = net_generic(net, audit_net_id); |
Eric Paris | f09ac9d | 2008-04-18 10:11:04 -0400 | [diff] [blame] | 605 | |
| 606 | mutex_lock(&audit_cmd_mutex); |
| 607 | mutex_unlock(&audit_cmd_mutex); |
| 608 | |
| 609 | /* Ignore failure. It'll only happen if the sender goes away, |
| 610 | because our timeout is set to infinite. */ |
Richard Guy Briggs | 33faba7 | 2013-07-16 13:18:45 -0400 | [diff] [blame] | 611 | netlink_unicast(aunet->nlsk , reply->skb, reply->portid, 0); |
Paul Moore | 61ec5d8 | 2020-04-20 10:09:29 -0400 | [diff] [blame] | 612 | reply->skb = NULL; |
| 613 | audit_free_reply(reply); |
Eric Paris | f09ac9d | 2008-04-18 10:11:04 -0400 | [diff] [blame] | 614 | return 0; |
| 615 | } |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 616 | /** |
| 617 | * audit_send_reply - send an audit reply message via netlink |
Eric W. Biederman | d211f17 | 2014-03-08 15:31:54 -0800 | [diff] [blame] | 618 | * @request_skb: skb of request we are replying to (used to target the reply) |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 619 | * @seq: sequence number |
| 620 | * @type: audit message type |
| 621 | * @done: done (last) flag |
| 622 | * @multi: multi-part message flag |
| 623 | * @payload: payload data |
| 624 | * @size: payload size |
| 625 | * |
Paul Moore | 61ec5d8 | 2020-04-20 10:09:29 -0400 | [diff] [blame] | 626 | * Allocates a skb, builds the netlink message, and sends it to the port id. |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 627 | */ |
Eric W. Biederman | 6f285b1 | 2014-02-28 19:44:55 -0800 | [diff] [blame] | 628 | static void audit_send_reply(struct sk_buff *request_skb, int seq, int type, int done, |
Richard Guy Briggs | f944163 | 2013-08-14 11:32:45 -0400 | [diff] [blame] | 629 | int multi, const void *payload, int size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | { |
Eric W. Biederman | 6f285b1 | 2014-02-28 19:44:55 -0800 | [diff] [blame] | 631 | u32 portid = NETLINK_CB(request_skb).portid; |
Eric Paris | f09ac9d | 2008-04-18 10:11:04 -0400 | [diff] [blame] | 632 | struct task_struct *tsk; |
Paul Moore | 61ec5d8 | 2020-04-20 10:09:29 -0400 | [diff] [blame] | 633 | struct audit_reply *reply; |
Eric Paris | f09ac9d | 2008-04-18 10:11:04 -0400 | [diff] [blame] | 634 | |
Paul Moore | 61ec5d8 | 2020-04-20 10:09:29 -0400 | [diff] [blame] | 635 | reply = kzalloc(sizeof(*reply), GFP_KERNEL); |
Eric Paris | f09ac9d | 2008-04-18 10:11:04 -0400 | [diff] [blame] | 636 | if (!reply) |
| 637 | return; |
| 638 | |
Paul Moore | 61ec5d8 | 2020-04-20 10:09:29 -0400 | [diff] [blame] | 639 | reply->skb = audit_make_reply(portid, seq, type, done, multi, payload, size); |
| 640 | if (!reply->skb) |
| 641 | goto err; |
Eric Paris | f09ac9d | 2008-04-18 10:11:04 -0400 | [diff] [blame] | 642 | |
Paul Moore | 61ec5d8 | 2020-04-20 10:09:29 -0400 | [diff] [blame] | 643 | reply->net = get_net(sock_net(NETLINK_CB(request_skb).sk)); |
Richard Guy Briggs | f944163 | 2013-08-14 11:32:45 -0400 | [diff] [blame] | 644 | reply->portid = portid; |
Eric Paris | f09ac9d | 2008-04-18 10:11:04 -0400 | [diff] [blame] | 645 | |
| 646 | tsk = kthread_run(audit_send_reply_thread, reply, "audit_send_reply"); |
Paul Moore | 61ec5d8 | 2020-04-20 10:09:29 -0400 | [diff] [blame] | 647 | if (IS_ERR(tsk)) |
| 648 | goto err; |
| 649 | |
| 650 | return; |
| 651 | |
| 652 | err: |
| 653 | audit_free_reply(reply); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | } |
| 655 | |
| 656 | /* |
| 657 | * Check for appropriate CAP_AUDIT_ capabilities on incoming audit |
| 658 | * control messages. |
| 659 | */ |
Darrel Goeddel | c7bdb54 | 2006-06-27 13:26:11 -0700 | [diff] [blame] | 660 | static int audit_netlink_ok(struct sk_buff *skb, u16 msg_type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | { |
| 662 | int err = 0; |
| 663 | |
Richard Guy Briggs | 5a3cb3b | 2013-08-16 00:04:46 -0400 | [diff] [blame] | 664 | /* Only support initial user namespace for now. */ |
Eric Paris | aa4af83 | 2014-03-30 19:07:54 -0400 | [diff] [blame] | 665 | /* |
| 666 | * We return ECONNREFUSED because it tricks userspace into thinking |
| 667 | * that audit was not configured into the kernel. Lots of users |
| 668 | * configure their PAM stack (because that's what the distro does) |
| 669 | * to reject login if unable to send messages to audit. If we return |
| 670 | * ECONNREFUSED the PAM stack thinks the kernel does not have audit |
| 671 | * configured in and will let login proceed. If we return EPERM |
| 672 | * userspace will reject all logins. This should be removed when we |
| 673 | * support non init namespaces!! |
| 674 | */ |
Linus Torvalds | 0b74717 | 2014-04-12 12:38:53 -0700 | [diff] [blame] | 675 | if (current_user_ns() != &init_user_ns) |
Eric Paris | aa4af83 | 2014-03-30 19:07:54 -0400 | [diff] [blame] | 676 | return -ECONNREFUSED; |
Eric W. Biederman | 34e36d8 | 2012-09-10 23:20:20 -0700 | [diff] [blame] | 677 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | switch (msg_type) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | case AUDIT_LIST: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | case AUDIT_ADD: |
| 681 | case AUDIT_DEL: |
Eric Paris | 1890090 | 2013-04-18 19:16:36 -0400 | [diff] [blame] | 682 | return -EOPNOTSUPP; |
| 683 | case AUDIT_GET: |
| 684 | case AUDIT_SET: |
Eric Paris | b0fed40 | 2013-05-22 12:54:49 -0400 | [diff] [blame] | 685 | case AUDIT_GET_FEATURE: |
| 686 | case AUDIT_SET_FEATURE: |
Eric Paris | 1890090 | 2013-04-18 19:16:36 -0400 | [diff] [blame] | 687 | case AUDIT_LIST_RULES: |
| 688 | case AUDIT_ADD_RULE: |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 689 | case AUDIT_DEL_RULE: |
Steve Grubb | c2f0c7c | 2005-05-06 12:38:39 +0100 | [diff] [blame] | 690 | case AUDIT_SIGNAL_INFO: |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 691 | case AUDIT_TTY_GET: |
| 692 | case AUDIT_TTY_SET: |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 693 | case AUDIT_TRIM: |
| 694 | case AUDIT_MAKE_EQUIV: |
Richard Guy Briggs | 5a3cb3b | 2013-08-16 00:04:46 -0400 | [diff] [blame] | 695 | /* Only support auditd and auditctl in initial pid namespace |
| 696 | * for now. */ |
Ameen Ali | 5985de6 | 2015-02-23 15:38:00 -0500 | [diff] [blame] | 697 | if (task_active_pid_ns(current) != &init_pid_ns) |
Richard Guy Briggs | 5a3cb3b | 2013-08-16 00:04:46 -0400 | [diff] [blame] | 698 | return -EPERM; |
| 699 | |
Eric W. Biederman | 90f62cf | 2014-04-23 14:29:27 -0700 | [diff] [blame] | 700 | if (!netlink_capable(skb, CAP_AUDIT_CONTROL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | err = -EPERM; |
| 702 | break; |
Steve Grubb | 0547410 | 2005-05-21 00:18:37 +0100 | [diff] [blame] | 703 | case AUDIT_USER: |
Robert P. J. Day | 039b6b3 | 2007-05-08 00:29:20 -0700 | [diff] [blame] | 704 | case AUDIT_FIRST_USER_MSG ... AUDIT_LAST_USER_MSG: |
| 705 | case AUDIT_FIRST_USER_MSG2 ... AUDIT_LAST_USER_MSG2: |
Eric W. Biederman | 90f62cf | 2014-04-23 14:29:27 -0700 | [diff] [blame] | 706 | if (!netlink_capable(skb, CAP_AUDIT_WRITE)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | err = -EPERM; |
| 708 | break; |
| 709 | default: /* bad msg */ |
| 710 | err = -EINVAL; |
| 711 | } |
| 712 | |
| 713 | return err; |
| 714 | } |
| 715 | |
Paul Moore | 233a686 | 2015-11-04 08:23:52 -0500 | [diff] [blame] | 716 | static void audit_log_common_recv_msg(struct audit_buffer **ab, u16 msg_type) |
Eric Paris | 50397bd | 2008-01-07 18:14:19 -0500 | [diff] [blame] | 717 | { |
Eric Paris | dc9eb69 | 2013-04-19 13:23:09 -0400 | [diff] [blame] | 718 | uid_t uid = from_kuid(&init_user_ns, current_uid()); |
Richard Guy Briggs | f1dc486 | 2013-12-11 13:52:26 -0500 | [diff] [blame] | 719 | pid_t pid = task_tgid_nr(current); |
Eric Paris | 50397bd | 2008-01-07 18:14:19 -0500 | [diff] [blame] | 720 | |
Tyler Hicks | 0868a5e | 2013-07-25 18:02:55 -0700 | [diff] [blame] | 721 | if (!audit_enabled && msg_type != AUDIT_USER_AVC) { |
Eric Paris | 50397bd | 2008-01-07 18:14:19 -0500 | [diff] [blame] | 722 | *ab = NULL; |
Paul Moore | 233a686 | 2015-11-04 08:23:52 -0500 | [diff] [blame] | 723 | return; |
Eric Paris | 50397bd | 2008-01-07 18:14:19 -0500 | [diff] [blame] | 724 | } |
| 725 | |
| 726 | *ab = audit_log_start(NULL, GFP_KERNEL, msg_type); |
Kees Cook | 0644ec0 | 2013-01-11 14:32:07 -0800 | [diff] [blame] | 727 | if (unlikely(!*ab)) |
Paul Moore | 233a686 | 2015-11-04 08:23:52 -0500 | [diff] [blame] | 728 | return; |
Richard Guy Briggs | f1dc486 | 2013-12-11 13:52:26 -0500 | [diff] [blame] | 729 | audit_log_format(*ab, "pid=%d uid=%u", pid, uid); |
Eric Paris | 4d3fb70 | 2013-04-30 09:53:34 -0400 | [diff] [blame] | 730 | audit_log_session_info(*ab); |
Eric Paris | b122c37 | 2013-04-19 15:00:33 -0400 | [diff] [blame] | 731 | audit_log_task_context(*ab); |
Eric Paris | 50397bd | 2008-01-07 18:14:19 -0500 | [diff] [blame] | 732 | } |
| 733 | |
Eric Paris | b0fed40 | 2013-05-22 12:54:49 -0400 | [diff] [blame] | 734 | int is_audit_feature_set(int i) |
| 735 | { |
| 736 | return af.features & AUDIT_FEATURE_TO_MASK(i); |
| 737 | } |
| 738 | |
| 739 | |
| 740 | static int audit_get_feature(struct sk_buff *skb) |
| 741 | { |
| 742 | u32 seq; |
| 743 | |
| 744 | seq = nlmsg_hdr(skb)->nlmsg_seq; |
| 745 | |
Richard Guy Briggs | 9ef9151 | 2014-08-24 20:37:52 -0400 | [diff] [blame] | 746 | audit_send_reply(skb, seq, AUDIT_GET_FEATURE, 0, 0, &af, sizeof(af)); |
Eric Paris | b0fed40 | 2013-05-22 12:54:49 -0400 | [diff] [blame] | 747 | |
| 748 | return 0; |
| 749 | } |
| 750 | |
| 751 | static void audit_log_feature_change(int which, u32 old_feature, u32 new_feature, |
| 752 | u32 old_lock, u32 new_lock, int res) |
| 753 | { |
| 754 | struct audit_buffer *ab; |
| 755 | |
Gao feng | b6c50fe | 2013-11-01 19:34:43 +0800 | [diff] [blame] | 756 | if (audit_enabled == AUDIT_OFF) |
| 757 | return; |
| 758 | |
Eric Paris | b0fed40 | 2013-05-22 12:54:49 -0400 | [diff] [blame] | 759 | ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_FEATURE_CHANGE); |
Richard Guy Briggs | 85e924b | 2018-02-21 04:30:07 -0500 | [diff] [blame] | 760 | if (!ab) |
| 761 | return; |
Richard Guy Briggs | ad2ac26 | 2014-01-07 13:08:41 -0500 | [diff] [blame] | 762 | audit_log_task_info(ab, current); |
Richard Guy Briggs | 897f1ac | 2014-10-30 11:22:53 -0400 | [diff] [blame] | 763 | audit_log_format(ab, " feature=%s old=%u new=%u old_lock=%u new_lock=%u res=%d", |
Eric Paris | b0fed40 | 2013-05-22 12:54:49 -0400 | [diff] [blame] | 764 | audit_feature_names[which], !!old_feature, !!new_feature, |
| 765 | !!old_lock, !!new_lock, res); |
| 766 | audit_log_end(ab); |
| 767 | } |
| 768 | |
Paul Moore | eef128d | 2020-02-24 16:38:57 -0500 | [diff] [blame] | 769 | static int audit_set_feature(struct audit_features *uaf) |
Eric Paris | b0fed40 | 2013-05-22 12:54:49 -0400 | [diff] [blame] | 770 | { |
Eric Paris | b0fed40 | 2013-05-22 12:54:49 -0400 | [diff] [blame] | 771 | int i; |
| 772 | |
Fabian Frederick | 6eed9b2 | 2014-06-03 22:05:10 +0200 | [diff] [blame] | 773 | BUILD_BUG_ON(AUDIT_LAST_FEATURE + 1 > ARRAY_SIZE(audit_feature_names)); |
Eric Paris | b0fed40 | 2013-05-22 12:54:49 -0400 | [diff] [blame] | 774 | |
| 775 | /* if there is ever a version 2 we should handle that here */ |
| 776 | |
| 777 | for (i = 0; i <= AUDIT_LAST_FEATURE; i++) { |
| 778 | u32 feature = AUDIT_FEATURE_TO_MASK(i); |
| 779 | u32 old_feature, new_feature, old_lock, new_lock; |
| 780 | |
| 781 | /* if we are not changing this feature, move along */ |
| 782 | if (!(feature & uaf->mask)) |
| 783 | continue; |
| 784 | |
| 785 | old_feature = af.features & feature; |
| 786 | new_feature = uaf->features & feature; |
| 787 | new_lock = (uaf->lock | af.lock) & feature; |
| 788 | old_lock = af.lock & feature; |
| 789 | |
| 790 | /* are we changing a locked feature? */ |
Gao feng | 4547b3b | 2013-11-01 19:34:44 +0800 | [diff] [blame] | 791 | if (old_lock && (new_feature != old_feature)) { |
Eric Paris | b0fed40 | 2013-05-22 12:54:49 -0400 | [diff] [blame] | 792 | audit_log_feature_change(i, old_feature, new_feature, |
| 793 | old_lock, new_lock, 0); |
| 794 | return -EPERM; |
| 795 | } |
| 796 | } |
| 797 | /* nothing invalid, do the changes */ |
| 798 | for (i = 0; i <= AUDIT_LAST_FEATURE; i++) { |
| 799 | u32 feature = AUDIT_FEATURE_TO_MASK(i); |
| 800 | u32 old_feature, new_feature, old_lock, new_lock; |
| 801 | |
| 802 | /* if we are not changing this feature, move along */ |
| 803 | if (!(feature & uaf->mask)) |
| 804 | continue; |
| 805 | |
| 806 | old_feature = af.features & feature; |
| 807 | new_feature = uaf->features & feature; |
| 808 | old_lock = af.lock & feature; |
| 809 | new_lock = (uaf->lock | af.lock) & feature; |
| 810 | |
| 811 | if (new_feature != old_feature) |
| 812 | audit_log_feature_change(i, old_feature, new_feature, |
| 813 | old_lock, new_lock, 1); |
| 814 | |
| 815 | if (new_feature) |
| 816 | af.features |= feature; |
| 817 | else |
| 818 | af.features &= ~feature; |
| 819 | af.lock |= new_lock; |
| 820 | } |
| 821 | |
| 822 | return 0; |
| 823 | } |
| 824 | |
Richard Guy Briggs | 133e1e5 | 2016-01-25 18:04:15 -0500 | [diff] [blame] | 825 | static int audit_replace(pid_t pid) |
| 826 | { |
Teng Fei Fan | a4f1356 | 2018-10-15 14:02:39 +0800 | [diff] [blame] | 827 | int len; |
Richard Guy Briggs | 133e1e5 | 2016-01-25 18:04:15 -0500 | [diff] [blame] | 828 | struct sk_buff *skb = audit_make_reply(0, 0, AUDIT_REPLACE, 0, 0, |
| 829 | &pid, sizeof(pid)); |
| 830 | |
| 831 | if (!skb) |
| 832 | return -ENOMEM; |
Teng Fei Fan | a4f1356 | 2018-10-15 14:02:39 +0800 | [diff] [blame] | 833 | mutex_lock(&audit_sock_mutex); |
| 834 | len = netlink_unicast(audit_sock, skb, audit_nlk_portid, 0); |
| 835 | mutex_unlock(&audit_sock_mutex); |
| 836 | return len; |
Richard Guy Briggs | 133e1e5 | 2016-01-25 18:04:15 -0500 | [diff] [blame] | 837 | } |
| 838 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 839 | static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh) |
| 840 | { |
Eric Paris | dc9eb69 | 2013-04-19 13:23:09 -0400 | [diff] [blame] | 841 | u32 seq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | void *data; |
Paul Moore | eef128d | 2020-02-24 16:38:57 -0500 | [diff] [blame] | 843 | int data_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 844 | int err; |
Steve Grubb | c040499 | 2005-05-13 18:17:42 +0100 | [diff] [blame] | 845 | struct audit_buffer *ab; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | u16 msg_type = nlh->nlmsg_type; |
Al Viro | e139606 | 2006-05-25 10:19:47 -0400 | [diff] [blame] | 847 | struct audit_sig_info *sig_data; |
Eric Paris | 50397bd | 2008-01-07 18:14:19 -0500 | [diff] [blame] | 848 | char *ctx = NULL; |
Al Viro | e139606 | 2006-05-25 10:19:47 -0400 | [diff] [blame] | 849 | u32 len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 850 | |
Darrel Goeddel | c7bdb54 | 2006-06-27 13:26:11 -0700 | [diff] [blame] | 851 | err = audit_netlink_ok(skb, msg_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | if (err) |
| 853 | return err; |
| 854 | |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 855 | /* As soon as there's any sign of userspace auditd, |
| 856 | * start kauditd to talk to it */ |
Gao feng | 13f51e1 | 2013-04-29 15:05:14 -0700 | [diff] [blame] | 857 | if (!kauditd_task) { |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 858 | kauditd_task = kthread_run(kauditd_thread, NULL, "kauditd"); |
Gao feng | 13f51e1 | 2013-04-29 15:05:14 -0700 | [diff] [blame] | 859 | if (IS_ERR(kauditd_task)) { |
| 860 | err = PTR_ERR(kauditd_task); |
| 861 | kauditd_task = NULL; |
| 862 | return err; |
| 863 | } |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 864 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | seq = nlh->nlmsg_seq; |
David S. Miller | c64e66c | 2012-06-26 21:45:21 -0700 | [diff] [blame] | 866 | data = nlmsg_data(nlh); |
Paul Moore | eef128d | 2020-02-24 16:38:57 -0500 | [diff] [blame] | 867 | data_len = nlmsg_len(nlh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 868 | |
| 869 | switch (msg_type) { |
Richard Guy Briggs | 09f883a | 2013-09-18 09:32:24 -0400 | [diff] [blame] | 870 | case AUDIT_GET: { |
| 871 | struct audit_status s; |
| 872 | memset(&s, 0, sizeof(s)); |
| 873 | s.enabled = audit_enabled; |
| 874 | s.failure = audit_failure; |
| 875 | s.pid = audit_pid; |
| 876 | s.rate_limit = audit_rate_limit; |
| 877 | s.backlog_limit = audit_backlog_limit; |
| 878 | s.lost = atomic_read(&audit_lost); |
| 879 | s.backlog = skb_queue_len(&audit_skb_queue); |
Richard Guy Briggs | 0288d71 | 2014-11-17 15:51:01 -0500 | [diff] [blame] | 880 | s.feature_bitmap = AUDIT_FEATURE_BITMAP_ALL; |
Richard Guy Briggs | a77ed4e | 2015-02-23 15:37:59 -0500 | [diff] [blame] | 881 | s.backlog_wait_time = audit_backlog_wait_time_master; |
Eric W. Biederman | 6f285b1 | 2014-02-28 19:44:55 -0800 | [diff] [blame] | 882 | audit_send_reply(skb, seq, AUDIT_GET, 0, 0, &s, sizeof(s)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 883 | break; |
Richard Guy Briggs | 09f883a | 2013-09-18 09:32:24 -0400 | [diff] [blame] | 884 | } |
| 885 | case AUDIT_SET: { |
| 886 | struct audit_status s; |
| 887 | memset(&s, 0, sizeof(s)); |
| 888 | /* guard against past and future API changes */ |
Paul Moore | eef128d | 2020-02-24 16:38:57 -0500 | [diff] [blame] | 889 | memcpy(&s, data, min_t(size_t, sizeof(s), data_len)); |
Richard Guy Briggs | 09f883a | 2013-09-18 09:32:24 -0400 | [diff] [blame] | 890 | if (s.mask & AUDIT_STATUS_ENABLED) { |
| 891 | err = audit_set_enabled(s.enabled); |
zhangxiliang | 20c6aaa | 2008-07-31 10:11:19 +0800 | [diff] [blame] | 892 | if (err < 0) |
| 893 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 894 | } |
Richard Guy Briggs | 09f883a | 2013-09-18 09:32:24 -0400 | [diff] [blame] | 895 | if (s.mask & AUDIT_STATUS_FAILURE) { |
| 896 | err = audit_set_failure(s.failure); |
zhangxiliang | 20c6aaa | 2008-07-31 10:11:19 +0800 | [diff] [blame] | 897 | if (err < 0) |
| 898 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | } |
Richard Guy Briggs | 09f883a | 2013-09-18 09:32:24 -0400 | [diff] [blame] | 900 | if (s.mask & AUDIT_STATUS_PID) { |
Paul Moore | fa2bea2 | 2016-08-30 17:19:13 -0400 | [diff] [blame] | 901 | /* NOTE: we are using task_tgid_vnr() below because |
| 902 | * the s.pid value is relative to the namespace |
| 903 | * of the caller; at present this doesn't matter |
| 904 | * much since you can really only run auditd |
| 905 | * from the initial pid namespace, but something |
| 906 | * to keep in mind if this changes */ |
Richard Guy Briggs | 09f883a | 2013-09-18 09:32:24 -0400 | [diff] [blame] | 907 | int new_pid = s.pid; |
Richard Guy Briggs | 133e1e5 | 2016-01-25 18:04:15 -0500 | [diff] [blame] | 908 | pid_t requesting_pid = task_tgid_vnr(current); |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 909 | |
Richard Guy Briggs | 935c9e7 | 2016-01-25 18:04:15 -0500 | [diff] [blame] | 910 | if ((!new_pid) && (requesting_pid != audit_pid)) { |
| 911 | audit_log_config_change("audit_pid", new_pid, audit_pid, 0); |
Richard Guy Briggs | 34eab0a | 2013-06-21 14:47:13 -0400 | [diff] [blame] | 912 | return -EACCES; |
Richard Guy Briggs | 935c9e7 | 2016-01-25 18:04:15 -0500 | [diff] [blame] | 913 | } |
Richard Guy Briggs | 133e1e5 | 2016-01-25 18:04:15 -0500 | [diff] [blame] | 914 | if (audit_pid && new_pid && |
Richard Guy Briggs | 935c9e7 | 2016-01-25 18:04:15 -0500 | [diff] [blame] | 915 | audit_replace(requesting_pid) != -ECONNREFUSED) { |
| 916 | audit_log_config_change("audit_pid", new_pid, audit_pid, 0); |
Richard Guy Briggs | 133e1e5 | 2016-01-25 18:04:15 -0500 | [diff] [blame] | 917 | return -EEXIST; |
Richard Guy Briggs | 935c9e7 | 2016-01-25 18:04:15 -0500 | [diff] [blame] | 918 | } |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 919 | if (audit_enabled != AUDIT_OFF) |
Eric Paris | dc9eb69 | 2013-04-19 13:23:09 -0400 | [diff] [blame] | 920 | audit_log_config_change("audit_pid", new_pid, audit_pid, 1); |
Huang Yiwei | 329c49e | 2020-02-20 16:34:58 +0800 | [diff] [blame] | 921 | mutex_lock(&audit_sock_mutex); |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 922 | audit_pid = new_pid; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 923 | audit_nlk_portid = NETLINK_CB(skb).portid; |
Gao feng | de92fc9 | 2013-12-17 11:10:42 +0800 | [diff] [blame] | 924 | audit_sock = skb->sk; |
Teng Fei Fan | a4f1356 | 2018-10-15 14:02:39 +0800 | [diff] [blame] | 925 | mutex_unlock(&audit_sock_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 926 | } |
Richard Guy Briggs | 09f883a | 2013-09-18 09:32:24 -0400 | [diff] [blame] | 927 | if (s.mask & AUDIT_STATUS_RATE_LIMIT) { |
| 928 | err = audit_set_rate_limit(s.rate_limit); |
zhangxiliang | 20c6aaa | 2008-07-31 10:11:19 +0800 | [diff] [blame] | 929 | if (err < 0) |
| 930 | return err; |
| 931 | } |
Richard Guy Briggs | 51cc83f | 2013-09-18 11:55:12 -0400 | [diff] [blame] | 932 | if (s.mask & AUDIT_STATUS_BACKLOG_LIMIT) { |
Richard Guy Briggs | 09f883a | 2013-09-18 09:32:24 -0400 | [diff] [blame] | 933 | err = audit_set_backlog_limit(s.backlog_limit); |
Richard Guy Briggs | 51cc83f | 2013-09-18 11:55:12 -0400 | [diff] [blame] | 934 | if (err < 0) |
| 935 | return err; |
| 936 | } |
Eric Paris | 3f0c5fa | 2014-01-13 16:49:28 -0500 | [diff] [blame] | 937 | if (s.mask & AUDIT_STATUS_BACKLOG_WAIT_TIME) { |
| 938 | if (sizeof(s) > (size_t)nlh->nlmsg_len) |
| 939 | return -EINVAL; |
Pranith Kumar | 724e7bf | 2015-03-11 14:08:19 -0400 | [diff] [blame] | 940 | if (s.backlog_wait_time > 10*AUDIT_BACKLOG_WAIT_TIME) |
Eric Paris | 3f0c5fa | 2014-01-13 16:49:28 -0500 | [diff] [blame] | 941 | return -EINVAL; |
| 942 | err = audit_set_backlog_wait_time(s.backlog_wait_time); |
| 943 | if (err < 0) |
| 944 | return err; |
Richard Guy Briggs | 51cc83f | 2013-09-18 11:55:12 -0400 | [diff] [blame] | 945 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 946 | break; |
Richard Guy Briggs | 09f883a | 2013-09-18 09:32:24 -0400 | [diff] [blame] | 947 | } |
Eric Paris | b0fed40 | 2013-05-22 12:54:49 -0400 | [diff] [blame] | 948 | case AUDIT_GET_FEATURE: |
| 949 | err = audit_get_feature(skb); |
| 950 | if (err) |
| 951 | return err; |
| 952 | break; |
| 953 | case AUDIT_SET_FEATURE: |
Paul Moore | eef128d | 2020-02-24 16:38:57 -0500 | [diff] [blame] | 954 | if (data_len < sizeof(struct audit_features)) |
| 955 | return -EINVAL; |
| 956 | err = audit_set_feature(data); |
Eric Paris | b0fed40 | 2013-05-22 12:54:49 -0400 | [diff] [blame] | 957 | if (err) |
| 958 | return err; |
| 959 | break; |
Steve Grubb | 0547410 | 2005-05-21 00:18:37 +0100 | [diff] [blame] | 960 | case AUDIT_USER: |
Robert P. J. Day | 039b6b3 | 2007-05-08 00:29:20 -0700 | [diff] [blame] | 961 | case AUDIT_FIRST_USER_MSG ... AUDIT_LAST_USER_MSG: |
| 962 | case AUDIT_FIRST_USER_MSG2 ... AUDIT_LAST_USER_MSG2: |
David Woodhouse | 4a4cd63 | 2005-06-22 14:56:47 +0100 | [diff] [blame] | 963 | if (!audit_enabled && msg_type != AUDIT_USER_AVC) |
| 964 | return 0; |
Paul Moore | 3fb1c81 | 2020-04-20 16:24:34 -0400 | [diff] [blame] | 965 | /* exit early if there isn't at least one character to print */ |
| 966 | if (data_len < 2) |
| 967 | return -EINVAL; |
David Woodhouse | 0f45aa1 | 2005-06-19 19:35:50 +0100 | [diff] [blame] | 968 | |
Richard Guy Briggs | 86b2efb | 2016-06-24 16:35:46 -0400 | [diff] [blame] | 969 | err = audit_filter(msg_type, AUDIT_FILTER_USER); |
Richard Guy Briggs | 724e4fc | 2013-11-25 21:57:51 -0500 | [diff] [blame] | 970 | if (err == 1) { /* match or error */ |
Paul Moore | eef128d | 2020-02-24 16:38:57 -0500 | [diff] [blame] | 971 | char *str = data; |
| 972 | |
David Woodhouse | 4a4cd63 | 2005-06-22 14:56:47 +0100 | [diff] [blame] | 973 | err = 0; |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 974 | if (msg_type == AUDIT_USER_TTY) { |
Peter Hurley | 37282a7 | 2016-01-09 22:55:31 -0800 | [diff] [blame] | 975 | err = tty_audit_push(); |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 976 | if (err) |
| 977 | break; |
| 978 | } |
Richard Guy Briggs | 1b7b533 | 2013-12-02 11:33:01 -0500 | [diff] [blame] | 979 | mutex_unlock(&audit_cmd_mutex); |
Eric Paris | dc9eb69 | 2013-04-19 13:23:09 -0400 | [diff] [blame] | 980 | audit_log_common_recv_msg(&ab, msg_type); |
Paul Moore | eef128d | 2020-02-24 16:38:57 -0500 | [diff] [blame] | 981 | if (msg_type != AUDIT_USER_TTY) { |
| 982 | /* ensure NULL termination */ |
| 983 | str[data_len - 1] = '\0'; |
Richard Guy Briggs | b50eba7 | 2013-09-16 18:20:42 -0400 | [diff] [blame] | 984 | audit_log_format(ab, " msg='%.*s'", |
| 985 | AUDIT_MESSAGE_TEXT_MAX, |
Paul Moore | eef128d | 2020-02-24 16:38:57 -0500 | [diff] [blame] | 986 | str); |
| 987 | } else { |
Eric Paris | f761610 | 2013-04-11 11:25:00 -0400 | [diff] [blame] | 988 | audit_log_format(ab, " data="); |
Paul Moore | eef128d | 2020-02-24 16:38:57 -0500 | [diff] [blame] | 989 | if (data_len > 0 && str[data_len - 1] == '\0') |
| 990 | data_len--; |
| 991 | audit_log_n_untrustedstring(ab, str, data_len); |
David Woodhouse | 4a4cd63 | 2005-06-22 14:56:47 +0100 | [diff] [blame] | 992 | } |
Richard Guy Briggs | f944163 | 2013-08-14 11:32:45 -0400 | [diff] [blame] | 993 | audit_set_portid(ab, NETLINK_CB(skb).portid); |
Eric Paris | 50397bd | 2008-01-07 18:14:19 -0500 | [diff] [blame] | 994 | audit_log_end(ab); |
Richard Guy Briggs | 1b7b533 | 2013-12-02 11:33:01 -0500 | [diff] [blame] | 995 | mutex_lock(&audit_cmd_mutex); |
David Woodhouse | 0f45aa1 | 2005-06-19 19:35:50 +0100 | [diff] [blame] | 996 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 997 | break; |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 998 | case AUDIT_ADD_RULE: |
| 999 | case AUDIT_DEL_RULE: |
Paul Moore | eef128d | 2020-02-24 16:38:57 -0500 | [diff] [blame] | 1000 | if (data_len < sizeof(struct audit_rule_data)) |
Amy Griffis | 93315ed | 2006-02-07 12:05:27 -0500 | [diff] [blame] | 1001 | return -EINVAL; |
Eric Paris | 1a6b9f2 | 2008-01-07 17:09:31 -0500 | [diff] [blame] | 1002 | if (audit_enabled == AUDIT_LOCKED) { |
Eric Paris | dc9eb69 | 2013-04-19 13:23:09 -0400 | [diff] [blame] | 1003 | audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE); |
| 1004 | audit_log_format(ab, " audit_enabled=%d res=0", audit_enabled); |
Eric Paris | 50397bd | 2008-01-07 18:14:19 -0500 | [diff] [blame] | 1005 | audit_log_end(ab); |
Steve Grubb | 6a01b07 | 2007-01-19 14:39:55 -0500 | [diff] [blame] | 1006 | return -EPERM; |
| 1007 | } |
Richard Guy Briggs | ce0d9f0 | 2013-11-20 14:01:53 -0500 | [diff] [blame] | 1008 | err = audit_rule_change(msg_type, NETLINK_CB(skb).portid, |
Paul Moore | eef128d | 2020-02-24 16:38:57 -0500 | [diff] [blame] | 1009 | seq, data, data_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1010 | break; |
Richard Guy Briggs | ce0d9f0 | 2013-11-20 14:01:53 -0500 | [diff] [blame] | 1011 | case AUDIT_LIST_RULES: |
Eric W. Biederman | 6f285b1 | 2014-02-28 19:44:55 -0800 | [diff] [blame] | 1012 | err = audit_list_rules_send(skb, seq); |
Richard Guy Briggs | ce0d9f0 | 2013-11-20 14:01:53 -0500 | [diff] [blame] | 1013 | break; |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 1014 | case AUDIT_TRIM: |
| 1015 | audit_trim_trees(); |
Eric Paris | dc9eb69 | 2013-04-19 13:23:09 -0400 | [diff] [blame] | 1016 | audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE); |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 1017 | audit_log_format(ab, " op=trim res=1"); |
| 1018 | audit_log_end(ab); |
| 1019 | break; |
| 1020 | case AUDIT_MAKE_EQUIV: { |
| 1021 | void *bufp = data; |
| 1022 | u32 sizes[2]; |
Paul Moore | eef128d | 2020-02-24 16:38:57 -0500 | [diff] [blame] | 1023 | size_t msglen = data_len; |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 1024 | char *old, *new; |
| 1025 | |
| 1026 | err = -EINVAL; |
Harvey Harrison | 7719e43 | 2008-04-27 02:39:56 -0700 | [diff] [blame] | 1027 | if (msglen < 2 * sizeof(u32)) |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 1028 | break; |
| 1029 | memcpy(sizes, bufp, 2 * sizeof(u32)); |
| 1030 | bufp += 2 * sizeof(u32); |
Harvey Harrison | 7719e43 | 2008-04-27 02:39:56 -0700 | [diff] [blame] | 1031 | msglen -= 2 * sizeof(u32); |
| 1032 | old = audit_unpack_string(&bufp, &msglen, sizes[0]); |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 1033 | if (IS_ERR(old)) { |
| 1034 | err = PTR_ERR(old); |
| 1035 | break; |
| 1036 | } |
Harvey Harrison | 7719e43 | 2008-04-27 02:39:56 -0700 | [diff] [blame] | 1037 | new = audit_unpack_string(&bufp, &msglen, sizes[1]); |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 1038 | if (IS_ERR(new)) { |
| 1039 | err = PTR_ERR(new); |
| 1040 | kfree(old); |
| 1041 | break; |
| 1042 | } |
| 1043 | /* OK, here comes... */ |
| 1044 | err = audit_tag_tree(old, new); |
| 1045 | |
Eric Paris | dc9eb69 | 2013-04-19 13:23:09 -0400 | [diff] [blame] | 1046 | audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE); |
Eric Paris | 50397bd | 2008-01-07 18:14:19 -0500 | [diff] [blame] | 1047 | |
Al Viro | 74c3cbe | 2007-07-22 08:04:18 -0400 | [diff] [blame] | 1048 | audit_log_format(ab, " op=make_equiv old="); |
| 1049 | audit_log_untrustedstring(ab, old); |
| 1050 | audit_log_format(ab, " new="); |
| 1051 | audit_log_untrustedstring(ab, new); |
| 1052 | audit_log_format(ab, " res=%d", !err); |
| 1053 | audit_log_end(ab); |
| 1054 | kfree(old); |
| 1055 | kfree(new); |
| 1056 | break; |
| 1057 | } |
Steve Grubb | c2f0c7c | 2005-05-06 12:38:39 +0100 | [diff] [blame] | 1058 | case AUDIT_SIGNAL_INFO: |
Eric Paris | 939cbf2 | 2009-09-23 13:46:00 -0400 | [diff] [blame] | 1059 | len = 0; |
| 1060 | if (audit_sig_sid) { |
| 1061 | err = security_secid_to_secctx(audit_sig_sid, &ctx, &len); |
| 1062 | if (err) |
| 1063 | return err; |
| 1064 | } |
Al Viro | e139606 | 2006-05-25 10:19:47 -0400 | [diff] [blame] | 1065 | sig_data = kmalloc(sizeof(*sig_data) + len, GFP_KERNEL); |
| 1066 | if (!sig_data) { |
Eric Paris | 939cbf2 | 2009-09-23 13:46:00 -0400 | [diff] [blame] | 1067 | if (audit_sig_sid) |
| 1068 | security_release_secctx(ctx, len); |
Al Viro | e139606 | 2006-05-25 10:19:47 -0400 | [diff] [blame] | 1069 | return -ENOMEM; |
| 1070 | } |
Eric W. Biederman | cca080d | 2012-02-07 16:53:48 -0800 | [diff] [blame] | 1071 | sig_data->uid = from_kuid(&init_user_ns, audit_sig_uid); |
Al Viro | e139606 | 2006-05-25 10:19:47 -0400 | [diff] [blame] | 1072 | sig_data->pid = audit_sig_pid; |
Eric Paris | 939cbf2 | 2009-09-23 13:46:00 -0400 | [diff] [blame] | 1073 | if (audit_sig_sid) { |
| 1074 | memcpy(sig_data->ctx, ctx, len); |
| 1075 | security_release_secctx(ctx, len); |
| 1076 | } |
Eric W. Biederman | 6f285b1 | 2014-02-28 19:44:55 -0800 | [diff] [blame] | 1077 | audit_send_reply(skb, seq, AUDIT_SIGNAL_INFO, 0, 0, |
| 1078 | sig_data, sizeof(*sig_data) + len); |
Al Viro | e139606 | 2006-05-25 10:19:47 -0400 | [diff] [blame] | 1079 | kfree(sig_data); |
Steve Grubb | c2f0c7c | 2005-05-06 12:38:39 +0100 | [diff] [blame] | 1080 | break; |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 1081 | case AUDIT_TTY_GET: { |
| 1082 | struct audit_tty_status s; |
Peter Hurley | 2e28d38 | 2016-01-09 22:55:33 -0800 | [diff] [blame] | 1083 | unsigned int t; |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 1084 | |
Peter Hurley | 2e28d38 | 2016-01-09 22:55:33 -0800 | [diff] [blame] | 1085 | t = READ_ONCE(current->signal->audit_tty); |
| 1086 | s.enabled = t & AUDIT_TTY_ENABLE; |
| 1087 | s.log_passwd = !!(t & AUDIT_TTY_LOG_PASSWD); |
Thomas Gleixner | 2070320 | 2009-12-09 14:19:35 +0000 | [diff] [blame] | 1088 | |
Eric W. Biederman | 6f285b1 | 2014-02-28 19:44:55 -0800 | [diff] [blame] | 1089 | audit_send_reply(skb, seq, AUDIT_TTY_GET, 0, 0, &s, sizeof(s)); |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 1090 | break; |
| 1091 | } |
| 1092 | case AUDIT_TTY_SET: { |
Richard Guy Briggs | a06e56b | 2013-11-15 11:29:02 -0500 | [diff] [blame] | 1093 | struct audit_tty_status s, old; |
Richard Guy Briggs | a06e56b | 2013-11-15 11:29:02 -0500 | [diff] [blame] | 1094 | struct audit_buffer *ab; |
Peter Hurley | 2e28d38 | 2016-01-09 22:55:33 -0800 | [diff] [blame] | 1095 | unsigned int t; |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 1096 | |
Richard Guy Briggs | 46e959e | 2013-05-03 14:03:50 -0400 | [diff] [blame] | 1097 | memset(&s, 0, sizeof(s)); |
| 1098 | /* guard against past and future API changes */ |
Paul Moore | eef128d | 2020-02-24 16:38:57 -0500 | [diff] [blame] | 1099 | memcpy(&s, data, min_t(size_t, sizeof(s), data_len)); |
Eric Paris | 0e23bac | 2014-01-13 21:12:34 -0500 | [diff] [blame] | 1100 | /* check if new data is valid */ |
| 1101 | if ((s.enabled != 0 && s.enabled != 1) || |
| 1102 | (s.log_passwd != 0 && s.log_passwd != 1)) |
| 1103 | err = -EINVAL; |
| 1104 | |
Peter Hurley | 2e28d38 | 2016-01-09 22:55:33 -0800 | [diff] [blame] | 1105 | if (err) |
| 1106 | t = READ_ONCE(current->signal->audit_tty); |
| 1107 | else { |
| 1108 | t = s.enabled | (-s.log_passwd & AUDIT_TTY_LOG_PASSWD); |
| 1109 | t = xchg(¤t->signal->audit_tty, t); |
Eric Paris | 0e23bac | 2014-01-13 21:12:34 -0500 | [diff] [blame] | 1110 | } |
Peter Hurley | 2e28d38 | 2016-01-09 22:55:33 -0800 | [diff] [blame] | 1111 | old.enabled = t & AUDIT_TTY_ENABLE; |
| 1112 | old.log_passwd = !!(t & AUDIT_TTY_LOG_PASSWD); |
Eric Paris | 0e23bac | 2014-01-13 21:12:34 -0500 | [diff] [blame] | 1113 | |
Richard Guy Briggs | a06e56b | 2013-11-15 11:29:02 -0500 | [diff] [blame] | 1114 | audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE); |
Eric Paris | 1ce319f | 2014-01-13 21:16:59 -0500 | [diff] [blame] | 1115 | audit_log_format(ab, " op=tty_set old-enabled=%d new-enabled=%d" |
| 1116 | " old-log_passwd=%d new-log_passwd=%d res=%d", |
| 1117 | old.enabled, s.enabled, old.log_passwd, |
| 1118 | s.log_passwd, !err); |
Richard Guy Briggs | a06e56b | 2013-11-15 11:29:02 -0500 | [diff] [blame] | 1119 | audit_log_end(ab); |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 1120 | break; |
| 1121 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1122 | default: |
| 1123 | err = -EINVAL; |
| 1124 | break; |
| 1125 | } |
| 1126 | |
| 1127 | return err < 0 ? err : 0; |
| 1128 | } |
| 1129 | |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1130 | /* |
Eric Paris | ea7ae60 | 2009-06-11 14:31:35 -0400 | [diff] [blame] | 1131 | * Get message from skb. Each message is processed by audit_receive_msg. |
| 1132 | * Malformed skbs with wrong length are discarded silently. |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1133 | */ |
Herbert Xu | 2a0a6eb | 2005-05-03 14:55:09 -0700 | [diff] [blame] | 1134 | static void audit_receive_skb(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1135 | { |
Eric Paris | ea7ae60 | 2009-06-11 14:31:35 -0400 | [diff] [blame] | 1136 | struct nlmsghdr *nlh; |
| 1137 | /* |
Hong zhi guo | 9419121 | 2013-03-27 06:49:06 +0000 | [diff] [blame] | 1138 | * len MUST be signed for nlmsg_next to be able to dec it below 0 |
Eric Paris | ea7ae60 | 2009-06-11 14:31:35 -0400 | [diff] [blame] | 1139 | * if the nlmsg_len was not aligned |
| 1140 | */ |
| 1141 | int len; |
| 1142 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1143 | |
Eric Paris | ea7ae60 | 2009-06-11 14:31:35 -0400 | [diff] [blame] | 1144 | nlh = nlmsg_hdr(skb); |
| 1145 | len = skb->len; |
| 1146 | |
Hong zhi guo | 9419121 | 2013-03-27 06:49:06 +0000 | [diff] [blame] | 1147 | while (nlmsg_ok(nlh, len)) { |
Eric Paris | ea7ae60 | 2009-06-11 14:31:35 -0400 | [diff] [blame] | 1148 | err = audit_receive_msg(skb, nlh); |
| 1149 | /* if err or if this message says it wants a response */ |
| 1150 | if (err || (nlh->nlmsg_flags & NLM_F_ACK)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1151 | netlink_ack(skb, nlh, err); |
Eric Paris | ea7ae60 | 2009-06-11 14:31:35 -0400 | [diff] [blame] | 1152 | |
Alexandru Copot | 2851da5 | 2013-03-28 23:31:29 +0200 | [diff] [blame] | 1153 | nlh = nlmsg_next(nlh, &len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1154 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1155 | } |
| 1156 | |
| 1157 | /* Receive messages from netlink socket. */ |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 1158 | static void audit_receive(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1159 | { |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1160 | mutex_lock(&audit_cmd_mutex); |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 1161 | audit_receive_skb(skb); |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1162 | mutex_unlock(&audit_cmd_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1163 | } |
| 1164 | |
Richard Guy Briggs | 3a101b8 | 2014-04-22 21:31:56 -0400 | [diff] [blame] | 1165 | /* Run custom bind function on netlink socket group connect or bind requests. */ |
Johannes Berg | 023e2cf | 2014-12-23 21:00:06 +0100 | [diff] [blame] | 1166 | static int audit_bind(struct net *net, int group) |
Richard Guy Briggs | 3a101b8 | 2014-04-22 21:31:56 -0400 | [diff] [blame] | 1167 | { |
| 1168 | if (!capable(CAP_AUDIT_READ)) |
| 1169 | return -EPERM; |
| 1170 | |
| 1171 | return 0; |
| 1172 | } |
| 1173 | |
Richard Guy Briggs | 33faba7 | 2013-07-16 13:18:45 -0400 | [diff] [blame] | 1174 | static int __net_init audit_net_init(struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1175 | { |
Pablo Neira Ayuso | a31f2d1 | 2012-06-29 06:15:21 +0000 | [diff] [blame] | 1176 | struct netlink_kernel_cfg cfg = { |
| 1177 | .input = audit_receive, |
Richard Guy Briggs | 3a101b8 | 2014-04-22 21:31:56 -0400 | [diff] [blame] | 1178 | .bind = audit_bind, |
Richard Guy Briggs | 451f921 | 2014-04-22 21:31:57 -0400 | [diff] [blame] | 1179 | .flags = NL_CFG_F_NONROOT_RECV, |
| 1180 | .groups = AUDIT_NLGRP_MAX, |
Pablo Neira Ayuso | a31f2d1 | 2012-06-29 06:15:21 +0000 | [diff] [blame] | 1181 | }; |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1182 | |
Richard Guy Briggs | 33faba7 | 2013-07-16 13:18:45 -0400 | [diff] [blame] | 1183 | struct audit_net *aunet = net_generic(net, audit_net_id); |
| 1184 | |
Richard Guy Briggs | 33faba7 | 2013-07-16 13:18:45 -0400 | [diff] [blame] | 1185 | aunet->nlsk = netlink_kernel_create(net, NETLINK_AUDIT, &cfg); |
Gao feng | 11ee39e | 2013-12-17 11:10:41 +0800 | [diff] [blame] | 1186 | if (aunet->nlsk == NULL) { |
Richard Guy Briggs | 33faba7 | 2013-07-16 13:18:45 -0400 | [diff] [blame] | 1187 | audit_panic("cannot initialize netlink socket in namespace"); |
Gao feng | 11ee39e | 2013-12-17 11:10:41 +0800 | [diff] [blame] | 1188 | return -ENOMEM; |
| 1189 | } |
| 1190 | aunet->nlsk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; |
Richard Guy Briggs | 33faba7 | 2013-07-16 13:18:45 -0400 | [diff] [blame] | 1191 | return 0; |
| 1192 | } |
| 1193 | |
| 1194 | static void __net_exit audit_net_exit(struct net *net) |
| 1195 | { |
| 1196 | struct audit_net *aunet = net_generic(net, audit_net_id); |
| 1197 | struct sock *sock = aunet->nlsk; |
Teng Fei Fan | a4f1356 | 2018-10-15 14:02:39 +0800 | [diff] [blame] | 1198 | mutex_lock(&audit_sock_mutex); |
Richard Guy Briggs | 33faba7 | 2013-07-16 13:18:45 -0400 | [diff] [blame] | 1199 | if (sock == audit_sock) { |
| 1200 | audit_pid = 0; |
| 1201 | audit_sock = NULL; |
| 1202 | } |
Teng Fei Fan | a4f1356 | 2018-10-15 14:02:39 +0800 | [diff] [blame] | 1203 | mutex_unlock(&audit_sock_mutex); |
Richard Guy Briggs | 33faba7 | 2013-07-16 13:18:45 -0400 | [diff] [blame] | 1204 | |
Monam Agarwal | e231d54 | 2014-03-24 00:16:19 +0530 | [diff] [blame] | 1205 | RCU_INIT_POINTER(aunet->nlsk, NULL); |
Richard Guy Briggs | 33faba7 | 2013-07-16 13:18:45 -0400 | [diff] [blame] | 1206 | synchronize_net(); |
| 1207 | netlink_kernel_release(sock); |
| 1208 | } |
| 1209 | |
Richard Guy Briggs | 8626877 | 2013-07-16 13:18:45 -0400 | [diff] [blame] | 1210 | static struct pernet_operations audit_net_ops __net_initdata = { |
Richard Guy Briggs | 33faba7 | 2013-07-16 13:18:45 -0400 | [diff] [blame] | 1211 | .init = audit_net_init, |
| 1212 | .exit = audit_net_exit, |
| 1213 | .id = &audit_net_id, |
| 1214 | .size = sizeof(struct audit_net), |
| 1215 | }; |
| 1216 | |
| 1217 | /* Initialize audit support at boot time. */ |
| 1218 | static int __init audit_init(void) |
| 1219 | { |
| 1220 | int i; |
| 1221 | |
Eric Paris | a3f0711 | 2008-11-05 12:47:09 -0500 | [diff] [blame] | 1222 | if (audit_initialized == AUDIT_DISABLED) |
| 1223 | return 0; |
| 1224 | |
Joe Perches | d957f7b | 2014-01-14 10:33:12 -0800 | [diff] [blame] | 1225 | pr_info("initializing netlink subsys (%s)\n", |
| 1226 | audit_default ? "enabled" : "disabled"); |
Richard Guy Briggs | 33faba7 | 2013-07-16 13:18:45 -0400 | [diff] [blame] | 1227 | register_pernet_subsys(&audit_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1228 | |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 1229 | skb_queue_head_init(&audit_skb_queue); |
Eric Paris | f3d357b | 2008-04-18 10:02:28 -0400 | [diff] [blame] | 1230 | skb_queue_head_init(&audit_skb_hold_queue); |
Eric Paris | a3f0711 | 2008-11-05 12:47:09 -0500 | [diff] [blame] | 1231 | audit_initialized = AUDIT_INITIALIZED; |
Darrel Goeddel | 3dc7e31 | 2006-03-10 18:14:06 -0600 | [diff] [blame] | 1232 | |
David Woodhouse | 9ad9ad3 | 2005-06-22 15:04:33 +0100 | [diff] [blame] | 1233 | audit_log(NULL, GFP_KERNEL, AUDIT_KERNEL, "initialized"); |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1234 | |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1235 | for (i = 0; i < AUDIT_INODE_BUCKETS; i++) |
| 1236 | INIT_LIST_HEAD(&audit_inode_hash[i]); |
Amy Griffis | f368c07d | 2006-04-07 16:55:56 -0400 | [diff] [blame] | 1237 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1238 | return 0; |
| 1239 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1240 | __initcall(audit_init); |
| 1241 | |
| 1242 | /* Process kernel command-line parameter at boot time. audit=0 or audit=1. */ |
| 1243 | static int __init audit_enable(char *str) |
| 1244 | { |
| 1245 | audit_default = !!simple_strtol(str, NULL, 0); |
Eric Paris | a3f0711 | 2008-11-05 12:47:09 -0500 | [diff] [blame] | 1246 | if (!audit_default) |
| 1247 | audit_initialized = AUDIT_DISABLED; |
Paul Moore | 93dedcf | 2017-09-01 09:44:34 -0400 | [diff] [blame] | 1248 | audit_enabled = audit_default; |
| 1249 | audit_ever_enabled = !!audit_enabled; |
Eric Paris | a3f0711 | 2008-11-05 12:47:09 -0500 | [diff] [blame] | 1250 | |
Joe Perches | d957f7b | 2014-01-14 10:33:12 -0800 | [diff] [blame] | 1251 | pr_info("%s\n", audit_default ? |
Gao feng | d3ca034 | 2013-10-31 14:31:01 +0800 | [diff] [blame] | 1252 | "enabled (after initialization)" : "disabled (until reboot)"); |
Eric Paris | a3f0711 | 2008-11-05 12:47:09 -0500 | [diff] [blame] | 1253 | |
OGAWA Hirofumi | 9b41046 | 2006-03-31 02:30:33 -0800 | [diff] [blame] | 1254 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1255 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1256 | __setup("audit=", audit_enable); |
| 1257 | |
Richard Guy Briggs | f910fde | 2013-09-17 12:34:52 -0400 | [diff] [blame] | 1258 | /* Process kernel command-line parameter at boot time. |
| 1259 | * audit_backlog_limit=<n> */ |
| 1260 | static int __init audit_backlog_limit_set(char *str) |
| 1261 | { |
Joe Perches | 3e1d0bb | 2014-01-14 10:33:13 -0800 | [diff] [blame] | 1262 | u32 audit_backlog_limit_arg; |
Joe Perches | d957f7b | 2014-01-14 10:33:12 -0800 | [diff] [blame] | 1263 | |
Richard Guy Briggs | f910fde | 2013-09-17 12:34:52 -0400 | [diff] [blame] | 1264 | pr_info("audit_backlog_limit: "); |
Joe Perches | 3e1d0bb | 2014-01-14 10:33:13 -0800 | [diff] [blame] | 1265 | if (kstrtouint(str, 0, &audit_backlog_limit_arg)) { |
| 1266 | pr_cont("using default of %u, unable to parse %s\n", |
Joe Perches | d957f7b | 2014-01-14 10:33:12 -0800 | [diff] [blame] | 1267 | audit_backlog_limit, str); |
Richard Guy Briggs | f910fde | 2013-09-17 12:34:52 -0400 | [diff] [blame] | 1268 | return 1; |
| 1269 | } |
Joe Perches | 3e1d0bb | 2014-01-14 10:33:13 -0800 | [diff] [blame] | 1270 | |
| 1271 | audit_backlog_limit = audit_backlog_limit_arg; |
Joe Perches | d957f7b | 2014-01-14 10:33:12 -0800 | [diff] [blame] | 1272 | pr_cont("%d\n", audit_backlog_limit); |
Richard Guy Briggs | f910fde | 2013-09-17 12:34:52 -0400 | [diff] [blame] | 1273 | |
| 1274 | return 1; |
| 1275 | } |
| 1276 | __setup("audit_backlog_limit=", audit_backlog_limit_set); |
| 1277 | |
Chris Wright | 16e1904 | 2005-05-06 15:53:34 +0100 | [diff] [blame] | 1278 | static void audit_buffer_free(struct audit_buffer *ab) |
| 1279 | { |
| 1280 | unsigned long flags; |
| 1281 | |
Chris Wright | 8fc6115 | 2005-05-06 15:54:17 +0100 | [diff] [blame] | 1282 | if (!ab) |
| 1283 | return; |
| 1284 | |
Markus Elfring | d865e57 | 2016-01-13 09:18:55 -0500 | [diff] [blame] | 1285 | kfree_skb(ab->skb); |
Chris Wright | 16e1904 | 2005-05-06 15:53:34 +0100 | [diff] [blame] | 1286 | spin_lock_irqsave(&audit_freelist_lock, flags); |
Serge E. Hallyn | 5d136a0 | 2006-04-27 16:45:14 -0500 | [diff] [blame] | 1287 | if (audit_freelist_count > AUDIT_MAXFREE) |
Chris Wright | 16e1904 | 2005-05-06 15:53:34 +0100 | [diff] [blame] | 1288 | kfree(ab); |
Serge E. Hallyn | 5d136a0 | 2006-04-27 16:45:14 -0500 | [diff] [blame] | 1289 | else { |
| 1290 | audit_freelist_count++; |
Chris Wright | 16e1904 | 2005-05-06 15:53:34 +0100 | [diff] [blame] | 1291 | list_add(&ab->list, &audit_freelist); |
Serge E. Hallyn | 5d136a0 | 2006-04-27 16:45:14 -0500 | [diff] [blame] | 1292 | } |
Chris Wright | 16e1904 | 2005-05-06 15:53:34 +0100 | [diff] [blame] | 1293 | spin_unlock_irqrestore(&audit_freelist_lock, flags); |
| 1294 | } |
| 1295 | |
Steve Grubb | c040499 | 2005-05-13 18:17:42 +0100 | [diff] [blame] | 1296 | static struct audit_buffer * audit_buffer_alloc(struct audit_context *ctx, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 1297 | gfp_t gfp_mask, int type) |
Chris Wright | 16e1904 | 2005-05-06 15:53:34 +0100 | [diff] [blame] | 1298 | { |
| 1299 | unsigned long flags; |
| 1300 | struct audit_buffer *ab = NULL; |
Steve Grubb | c040499 | 2005-05-13 18:17:42 +0100 | [diff] [blame] | 1301 | struct nlmsghdr *nlh; |
Chris Wright | 16e1904 | 2005-05-06 15:53:34 +0100 | [diff] [blame] | 1302 | |
| 1303 | spin_lock_irqsave(&audit_freelist_lock, flags); |
| 1304 | if (!list_empty(&audit_freelist)) { |
| 1305 | ab = list_entry(audit_freelist.next, |
| 1306 | struct audit_buffer, list); |
| 1307 | list_del(&ab->list); |
| 1308 | --audit_freelist_count; |
| 1309 | } |
| 1310 | spin_unlock_irqrestore(&audit_freelist_lock, flags); |
| 1311 | |
| 1312 | if (!ab) { |
David Woodhouse | 4332bdd | 2005-05-06 15:59:57 +0100 | [diff] [blame] | 1313 | ab = kmalloc(sizeof(*ab), gfp_mask); |
Chris Wright | 16e1904 | 2005-05-06 15:53:34 +0100 | [diff] [blame] | 1314 | if (!ab) |
Chris Wright | 8fc6115 | 2005-05-06 15:54:17 +0100 | [diff] [blame] | 1315 | goto err; |
Chris Wright | 16e1904 | 2005-05-06 15:53:34 +0100 | [diff] [blame] | 1316 | } |
Chris Wright | 8fc6115 | 2005-05-06 15:54:17 +0100 | [diff] [blame] | 1317 | |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 1318 | ab->ctx = ctx; |
David Woodhouse | 9ad9ad3 | 2005-06-22 15:04:33 +0100 | [diff] [blame] | 1319 | ab->gfp_mask = gfp_mask; |
Eric Paris | ee080e6 | 2009-06-11 14:31:35 -0400 | [diff] [blame] | 1320 | |
| 1321 | ab->skb = nlmsg_new(AUDIT_BUFSIZ, gfp_mask); |
| 1322 | if (!ab->skb) |
David S. Miller | c64e66c | 2012-06-26 21:45:21 -0700 | [diff] [blame] | 1323 | goto err; |
Eric Paris | ee080e6 | 2009-06-11 14:31:35 -0400 | [diff] [blame] | 1324 | |
David S. Miller | c64e66c | 2012-06-26 21:45:21 -0700 | [diff] [blame] | 1325 | nlh = nlmsg_put(ab->skb, 0, 0, type, 0, 0); |
| 1326 | if (!nlh) |
| 1327 | goto out_kfree_skb; |
Eric Paris | ee080e6 | 2009-06-11 14:31:35 -0400 | [diff] [blame] | 1328 | |
Chris Wright | 16e1904 | 2005-05-06 15:53:34 +0100 | [diff] [blame] | 1329 | return ab; |
Eric Paris | ee080e6 | 2009-06-11 14:31:35 -0400 | [diff] [blame] | 1330 | |
David S. Miller | c64e66c | 2012-06-26 21:45:21 -0700 | [diff] [blame] | 1331 | out_kfree_skb: |
Eric Paris | ee080e6 | 2009-06-11 14:31:35 -0400 | [diff] [blame] | 1332 | kfree_skb(ab->skb); |
| 1333 | ab->skb = NULL; |
Chris Wright | 8fc6115 | 2005-05-06 15:54:17 +0100 | [diff] [blame] | 1334 | err: |
| 1335 | audit_buffer_free(ab); |
| 1336 | return NULL; |
Chris Wright | 16e1904 | 2005-05-06 15:53:34 +0100 | [diff] [blame] | 1337 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1338 | |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1339 | /** |
| 1340 | * audit_serial - compute a serial number for the audit record |
| 1341 | * |
| 1342 | * Compute a serial number for the audit record. Audit records are |
David Woodhouse | bfb4496 | 2005-05-21 21:08:09 +0100 | [diff] [blame] | 1343 | * written to user-space as soon as they are generated, so a complete |
| 1344 | * audit record may be written in several pieces. The timestamp of the |
| 1345 | * record and this serial number are used by the user-space tools to |
| 1346 | * determine which pieces belong to the same audit record. The |
| 1347 | * (timestamp,serial) tuple is unique for each syscall and is live from |
| 1348 | * syscall entry to syscall exit. |
| 1349 | * |
David Woodhouse | bfb4496 | 2005-05-21 21:08:09 +0100 | [diff] [blame] | 1350 | * NOTE: Another possibility is to store the formatted records off the |
| 1351 | * audit context (for those records that have a context), and emit them |
| 1352 | * all at syscall exit. However, this could delay the reporting of |
| 1353 | * significant errors until syscall exit (or never, if the system |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1354 | * halts). |
| 1355 | */ |
David Woodhouse | bfb4496 | 2005-05-21 21:08:09 +0100 | [diff] [blame] | 1356 | unsigned int audit_serial(void) |
| 1357 | { |
Richard Guy Briggs | 01478d7 | 2014-06-13 18:22:00 -0400 | [diff] [blame] | 1358 | static atomic_t serial = ATOMIC_INIT(0); |
David Woodhouse | bfb4496 | 2005-05-21 21:08:09 +0100 | [diff] [blame] | 1359 | |
Richard Guy Briggs | 01478d7 | 2014-06-13 18:22:00 -0400 | [diff] [blame] | 1360 | return atomic_add_return(1, &serial); |
David Woodhouse | bfb4496 | 2005-05-21 21:08:09 +0100 | [diff] [blame] | 1361 | } |
| 1362 | |
Daniel Walker | 5600b89 | 2007-10-18 03:06:10 -0700 | [diff] [blame] | 1363 | static inline void audit_get_stamp(struct audit_context *ctx, |
David Woodhouse | bfb4496 | 2005-05-21 21:08:09 +0100 | [diff] [blame] | 1364 | struct timespec *t, unsigned int *serial) |
| 1365 | { |
Al Viro | 48887e6 | 2008-12-06 01:05:50 -0500 | [diff] [blame] | 1366 | if (!ctx || !auditsc_get_stamp(ctx, t, serial)) { |
David Woodhouse | bfb4496 | 2005-05-21 21:08:09 +0100 | [diff] [blame] | 1367 | *t = CURRENT_TIME; |
| 1368 | *serial = audit_serial(); |
| 1369 | } |
| 1370 | } |
| 1371 | |
Andrew Morton | 8291991 | 2013-01-11 14:32:11 -0800 | [diff] [blame] | 1372 | /* |
| 1373 | * Wait for auditd to drain the queue a little |
| 1374 | */ |
Eric Paris | c81825d | 2014-01-13 15:42:16 -0500 | [diff] [blame] | 1375 | static long wait_for_auditd(long sleep_time) |
Andrew Morton | 8291991 | 2013-01-11 14:32:11 -0800 | [diff] [blame] | 1376 | { |
| 1377 | DECLARE_WAITQUEUE(wait, current); |
Andrew Morton | 8291991 | 2013-01-11 14:32:11 -0800 | [diff] [blame] | 1378 | |
| 1379 | if (audit_backlog_limit && |
Paul Moore | 7ffb8e3 | 2016-04-04 16:44:02 -0400 | [diff] [blame] | 1380 | skb_queue_len(&audit_skb_queue) > audit_backlog_limit) { |
| 1381 | add_wait_queue_exclusive(&audit_backlog_wait, &wait); |
| 1382 | set_current_state(TASK_UNINTERRUPTIBLE); |
Eric Paris | c81825d | 2014-01-13 15:42:16 -0500 | [diff] [blame] | 1383 | sleep_time = schedule_timeout(sleep_time); |
Paul Moore | 7ffb8e3 | 2016-04-04 16:44:02 -0400 | [diff] [blame] | 1384 | remove_wait_queue(&audit_backlog_wait, &wait); |
| 1385 | } |
Richard Guy Briggs | ae887e0 | 2013-09-16 10:45:59 -0400 | [diff] [blame] | 1386 | |
Eric Paris | c81825d | 2014-01-13 15:42:16 -0500 | [diff] [blame] | 1387 | return sleep_time; |
Andrew Morton | 8291991 | 2013-01-11 14:32:11 -0800 | [diff] [blame] | 1388 | } |
| 1389 | |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1390 | /** |
| 1391 | * audit_log_start - obtain an audit buffer |
| 1392 | * @ctx: audit_context (may be NULL) |
| 1393 | * @gfp_mask: type of allocation |
| 1394 | * @type: audit message type |
| 1395 | * |
| 1396 | * Returns audit_buffer pointer on success or NULL on error. |
| 1397 | * |
| 1398 | * Obtain an audit buffer. This routine does locking to obtain the |
| 1399 | * audit buffer, but then no locking is required for calls to |
| 1400 | * audit_log_*format. If the task (ctx) is a task that is currently in a |
| 1401 | * syscall, then the syscall is marked as auditable and an audit record |
| 1402 | * will be written at syscall exit. If there is no associated task, then |
| 1403 | * task context (ctx) should be NULL. |
| 1404 | */ |
Al Viro | 9796fdd | 2005-10-21 03:22:03 -0400 | [diff] [blame] | 1405 | struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, |
David Woodhouse | 9ad9ad3 | 2005-06-22 15:04:33 +0100 | [diff] [blame] | 1406 | int type) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1407 | { |
| 1408 | struct audit_buffer *ab = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1409 | struct timespec t; |
Andrew Morton | ef00be0 | 2008-01-10 11:02:39 -0800 | [diff] [blame] | 1410 | unsigned int uninitialized_var(serial); |
Toshiyuki Okajima | 6dd80ab | 2013-12-05 16:15:23 +0900 | [diff] [blame] | 1411 | int reserve = 5; /* Allow atomic callers to go up to five |
| 1412 | entries over the normal backlog limit */ |
David Woodhouse | ac4cec4 | 2005-07-02 14:08:48 +0100 | [diff] [blame] | 1413 | unsigned long timeout_start = jiffies; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1414 | |
Eric Paris | a3f0711 | 2008-11-05 12:47:09 -0500 | [diff] [blame] | 1415 | if (audit_initialized != AUDIT_INITIALIZED) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1416 | return NULL; |
| 1417 | |
Richard Guy Briggs | 86b2efb | 2016-06-24 16:35:46 -0400 | [diff] [blame] | 1418 | if (unlikely(!audit_filter(type, AUDIT_FILTER_TYPE))) |
Dustin Kirkland | c8edc80 | 2005-11-03 16:12:36 +0000 | [diff] [blame] | 1419 | return NULL; |
| 1420 | |
Mel Gorman | d0164ad | 2015-11-06 16:28:21 -0800 | [diff] [blame] | 1421 | if (gfp_mask & __GFP_DIRECT_RECLAIM) { |
Richard Guy Briggs | f48a942 | 2016-01-13 09:15:19 -0500 | [diff] [blame] | 1422 | if (audit_pid && audit_pid == current->tgid) |
Mel Gorman | d0164ad | 2015-11-06 16:28:21 -0800 | [diff] [blame] | 1423 | gfp_mask &= ~__GFP_DIRECT_RECLAIM; |
Toshiyuki Okajima | 6dd80ab | 2013-12-05 16:15:23 +0900 | [diff] [blame] | 1424 | else |
| 1425 | reserve = 0; |
| 1426 | } |
David Woodhouse | 9ad9ad3 | 2005-06-22 15:04:33 +0100 | [diff] [blame] | 1427 | |
| 1428 | while (audit_backlog_limit |
| 1429 | && skb_queue_len(&audit_skb_queue) > audit_backlog_limit + reserve) { |
Mel Gorman | d0164ad | 2015-11-06 16:28:21 -0800 | [diff] [blame] | 1430 | if (gfp_mask & __GFP_DIRECT_RECLAIM && audit_backlog_wait_time) { |
Eric Paris | c81825d | 2014-01-13 15:42:16 -0500 | [diff] [blame] | 1431 | long sleep_time; |
David Woodhouse | ac4cec4 | 2005-07-02 14:08:48 +0100 | [diff] [blame] | 1432 | |
Eric Paris | c81825d | 2014-01-13 15:42:16 -0500 | [diff] [blame] | 1433 | sleep_time = timeout_start + audit_backlog_wait_time - jiffies; |
| 1434 | if (sleep_time > 0) { |
Richard Guy Briggs | ae887e0 | 2013-09-16 10:45:59 -0400 | [diff] [blame] | 1435 | sleep_time = wait_for_auditd(sleep_time); |
Eric Paris | c81825d | 2014-01-13 15:42:16 -0500 | [diff] [blame] | 1436 | if (sleep_time > 0) |
Richard Guy Briggs | ae887e0 | 2013-09-16 10:45:59 -0400 | [diff] [blame] | 1437 | continue; |
Konstantin Khlebnikov | 8ac1c8d | 2013-09-24 15:27:42 -0700 | [diff] [blame] | 1438 | } |
David Woodhouse | 9ad9ad3 | 2005-06-22 15:04:33 +0100 | [diff] [blame] | 1439 | } |
Eric Paris | 320f1b1 | 2008-01-23 22:55:05 -0500 | [diff] [blame] | 1440 | if (audit_rate_check() && printk_ratelimit()) |
Joe Perches | d957f7b | 2014-01-14 10:33:12 -0800 | [diff] [blame] | 1441 | pr_warn("audit_backlog=%d > audit_backlog_limit=%d\n", |
| 1442 | skb_queue_len(&audit_skb_queue), |
| 1443 | audit_backlog_limit); |
David Woodhouse | fb19b4c | 2005-05-19 14:55:56 +0100 | [diff] [blame] | 1444 | audit_log_lost("backlog limit exceeded"); |
Paul Moore | eb8baf6 | 2016-01-13 09:15:18 -0500 | [diff] [blame] | 1445 | audit_backlog_wait_time = 0; |
David Woodhouse | ac4cec4 | 2005-07-02 14:08:48 +0100 | [diff] [blame] | 1446 | wake_up(&audit_backlog_wait); |
David Woodhouse | fb19b4c | 2005-05-19 14:55:56 +0100 | [diff] [blame] | 1447 | return NULL; |
| 1448 | } |
| 1449 | |
Richard Guy Briggs | c4b7a77 | 2016-01-13 09:15:18 -0500 | [diff] [blame] | 1450 | if (!reserve && !audit_backlog_wait_time) |
Richard Guy Briggs | efef73a | 2015-02-23 15:38:00 -0500 | [diff] [blame] | 1451 | audit_backlog_wait_time = audit_backlog_wait_time_master; |
Richard Guy Briggs | e789e56 | 2013-09-12 23:03:51 -0400 | [diff] [blame] | 1452 | |
David Woodhouse | 9ad9ad3 | 2005-06-22 15:04:33 +0100 | [diff] [blame] | 1453 | ab = audit_buffer_alloc(ctx, gfp_mask, type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1454 | if (!ab) { |
| 1455 | audit_log_lost("out of memory in audit_log_start"); |
| 1456 | return NULL; |
| 1457 | } |
| 1458 | |
David Woodhouse | bfb4496 | 2005-05-21 21:08:09 +0100 | [diff] [blame] | 1459 | audit_get_stamp(ab->ctx, &t, &serial); |
Chris Wright | 197c69c | 2005-05-11 10:54:05 +0100 | [diff] [blame] | 1460 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1461 | audit_log_format(ab, "audit(%lu.%03lu:%u): ", |
| 1462 | t.tv_sec, t.tv_nsec/1000000, serial); |
| 1463 | return ab; |
| 1464 | } |
| 1465 | |
Chris Wright | 8fc6115 | 2005-05-06 15:54:17 +0100 | [diff] [blame] | 1466 | /** |
Chris Wright | 5ac52f3 | 2005-05-06 15:54:53 +0100 | [diff] [blame] | 1467 | * audit_expand - expand skb in the audit buffer |
Chris Wright | 8fc6115 | 2005-05-06 15:54:17 +0100 | [diff] [blame] | 1468 | * @ab: audit_buffer |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1469 | * @extra: space to add at tail of the skb |
Chris Wright | 8fc6115 | 2005-05-06 15:54:17 +0100 | [diff] [blame] | 1470 | * |
| 1471 | * Returns 0 (no space) on failed expansion, or available space if |
| 1472 | * successful. |
| 1473 | */ |
David Woodhouse | e3b926b | 2005-05-10 18:56:08 +0100 | [diff] [blame] | 1474 | static inline int audit_expand(struct audit_buffer *ab, int extra) |
Chris Wright | 8fc6115 | 2005-05-06 15:54:17 +0100 | [diff] [blame] | 1475 | { |
Chris Wright | 5ac52f3 | 2005-05-06 15:54:53 +0100 | [diff] [blame] | 1476 | struct sk_buff *skb = ab->skb; |
Herbert Xu | 406a1d8 | 2008-01-28 20:47:09 -0800 | [diff] [blame] | 1477 | int oldtail = skb_tailroom(skb); |
| 1478 | int ret = pskb_expand_head(skb, 0, extra, ab->gfp_mask); |
| 1479 | int newtail = skb_tailroom(skb); |
| 1480 | |
Chris Wright | 5ac52f3 | 2005-05-06 15:54:53 +0100 | [diff] [blame] | 1481 | if (ret < 0) { |
| 1482 | audit_log_lost("out of memory in audit_expand"); |
Chris Wright | 8fc6115 | 2005-05-06 15:54:17 +0100 | [diff] [blame] | 1483 | return 0; |
Chris Wright | 5ac52f3 | 2005-05-06 15:54:53 +0100 | [diff] [blame] | 1484 | } |
Herbert Xu | 406a1d8 | 2008-01-28 20:47:09 -0800 | [diff] [blame] | 1485 | |
| 1486 | skb->truesize += newtail - oldtail; |
| 1487 | return newtail; |
Chris Wright | 8fc6115 | 2005-05-06 15:54:17 +0100 | [diff] [blame] | 1488 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1489 | |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1490 | /* |
| 1491 | * Format an audit message into the audit buffer. If there isn't enough |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1492 | * room in the audit buffer, more room will be allocated and vsnprint |
| 1493 | * will be called a second time. Currently, we assume that a printk |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1494 | * can't format message larger than 1024 bytes, so we don't either. |
| 1495 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1496 | static void audit_log_vformat(struct audit_buffer *ab, const char *fmt, |
| 1497 | va_list args) |
| 1498 | { |
| 1499 | int len, avail; |
Chris Wright | 5ac52f3 | 2005-05-06 15:54:53 +0100 | [diff] [blame] | 1500 | struct sk_buff *skb; |
David Woodhouse | eecb0a7 | 2005-05-10 18:58:51 +0100 | [diff] [blame] | 1501 | va_list args2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1502 | |
| 1503 | if (!ab) |
| 1504 | return; |
| 1505 | |
Chris Wright | 5ac52f3 | 2005-05-06 15:54:53 +0100 | [diff] [blame] | 1506 | BUG_ON(!ab->skb); |
| 1507 | skb = ab->skb; |
| 1508 | avail = skb_tailroom(skb); |
| 1509 | if (avail == 0) { |
David Woodhouse | e3b926b | 2005-05-10 18:56:08 +0100 | [diff] [blame] | 1510 | avail = audit_expand(ab, AUDIT_BUFSIZ); |
Chris Wright | 8fc6115 | 2005-05-06 15:54:17 +0100 | [diff] [blame] | 1511 | if (!avail) |
| 1512 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1513 | } |
David Woodhouse | eecb0a7 | 2005-05-10 18:58:51 +0100 | [diff] [blame] | 1514 | va_copy(args2, args); |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 1515 | len = vsnprintf(skb_tail_pointer(skb), avail, fmt, args); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1516 | if (len >= avail) { |
| 1517 | /* The printk buffer is 1024 bytes long, so if we get |
| 1518 | * here and AUDIT_BUFSIZ is at least 1024, then we can |
| 1519 | * log everything that printk could have logged. */ |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1520 | avail = audit_expand(ab, |
| 1521 | max_t(unsigned, AUDIT_BUFSIZ, 1+len-avail)); |
Chris Wright | 8fc6115 | 2005-05-06 15:54:17 +0100 | [diff] [blame] | 1522 | if (!avail) |
Jesper Juhl | a0e86bd | 2012-01-08 22:44:29 +0100 | [diff] [blame] | 1523 | goto out_va_end; |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 1524 | len = vsnprintf(skb_tail_pointer(skb), avail, fmt, args2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1525 | } |
Steve Grubb | 168b717 | 2005-05-19 10:24:22 +0100 | [diff] [blame] | 1526 | if (len > 0) |
| 1527 | skb_put(skb, len); |
Jesper Juhl | a0e86bd | 2012-01-08 22:44:29 +0100 | [diff] [blame] | 1528 | out_va_end: |
| 1529 | va_end(args2); |
Chris Wright | 8fc6115 | 2005-05-06 15:54:17 +0100 | [diff] [blame] | 1530 | out: |
| 1531 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1532 | } |
| 1533 | |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1534 | /** |
| 1535 | * audit_log_format - format a message into the audit buffer. |
| 1536 | * @ab: audit_buffer |
| 1537 | * @fmt: format string |
| 1538 | * @...: optional parameters matching @fmt string |
| 1539 | * |
| 1540 | * All the work is done in audit_log_vformat. |
| 1541 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1542 | void audit_log_format(struct audit_buffer *ab, const char *fmt, ...) |
| 1543 | { |
| 1544 | va_list args; |
| 1545 | |
| 1546 | if (!ab) |
| 1547 | return; |
| 1548 | va_start(args, fmt); |
| 1549 | audit_log_vformat(ab, fmt, args); |
| 1550 | va_end(args); |
| 1551 | } |
| 1552 | |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1553 | /** |
| 1554 | * audit_log_hex - convert a buffer to hex and append it to the audit skb |
| 1555 | * @ab: the audit_buffer |
| 1556 | * @buf: buffer to convert to hex |
| 1557 | * @len: length of @buf to be converted |
| 1558 | * |
| 1559 | * No return value; failure to expand is silently ignored. |
| 1560 | * |
| 1561 | * This function will take the passed buf and convert it into a string of |
| 1562 | * ascii hex digits. The new string is placed onto the skb. |
| 1563 | */ |
Eric Paris | b556f8a | 2008-04-18 10:12:59 -0400 | [diff] [blame] | 1564 | void audit_log_n_hex(struct audit_buffer *ab, const unsigned char *buf, |
Steve Grubb | 168b717 | 2005-05-19 10:24:22 +0100 | [diff] [blame] | 1565 | size_t len) |
| 83c7d09 | 2005-04-29 15:54:44 +0100 | [diff] [blame] | 1566 | { |
Steve Grubb | 168b717 | 2005-05-19 10:24:22 +0100 | [diff] [blame] | 1567 | int i, avail, new_len; |
| 1568 | unsigned char *ptr; |
| 1569 | struct sk_buff *skb; |
| 83c7d09 | 2005-04-29 15:54:44 +0100 | [diff] [blame] | 1570 | |
Amy Griffis | 8ef2d30 | 2006-09-07 17:03:02 -0400 | [diff] [blame] | 1571 | if (!ab) |
| 1572 | return; |
| 1573 | |
Steve Grubb | 168b717 | 2005-05-19 10:24:22 +0100 | [diff] [blame] | 1574 | BUG_ON(!ab->skb); |
| 1575 | skb = ab->skb; |
| 1576 | avail = skb_tailroom(skb); |
| 1577 | new_len = len<<1; |
| 1578 | if (new_len >= avail) { |
| 1579 | /* Round the buffer request up to the next multiple */ |
| 1580 | new_len = AUDIT_BUFSIZ*(((new_len-avail)/AUDIT_BUFSIZ) + 1); |
| 1581 | avail = audit_expand(ab, new_len); |
| 1582 | if (!avail) |
| 1583 | return; |
| 1584 | } |
| 1585 | |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 1586 | ptr = skb_tail_pointer(skb); |
Joe Perches | b8dbc32 | 2014-01-13 23:31:27 -0800 | [diff] [blame] | 1587 | for (i = 0; i < len; i++) |
| 1588 | ptr = hex_byte_pack_upper(ptr, buf[i]); |
Steve Grubb | 168b717 | 2005-05-19 10:24:22 +0100 | [diff] [blame] | 1589 | *ptr = 0; |
| 1590 | skb_put(skb, len << 1); /* new string is twice the old string */ |
| 83c7d09 | 2005-04-29 15:54:44 +0100 | [diff] [blame] | 1591 | } |
| 1592 | |
Amy Griffis | 9c937dc | 2006-06-08 23:19:31 -0400 | [diff] [blame] | 1593 | /* |
| 1594 | * Format a string of no more than slen characters into the audit buffer, |
| 1595 | * enclosed in quote marks. |
| 1596 | */ |
Eric Paris | b556f8a | 2008-04-18 10:12:59 -0400 | [diff] [blame] | 1597 | void audit_log_n_string(struct audit_buffer *ab, const char *string, |
| 1598 | size_t slen) |
Amy Griffis | 9c937dc | 2006-06-08 23:19:31 -0400 | [diff] [blame] | 1599 | { |
| 1600 | int avail, new_len; |
| 1601 | unsigned char *ptr; |
| 1602 | struct sk_buff *skb; |
| 1603 | |
Amy Griffis | 8ef2d30 | 2006-09-07 17:03:02 -0400 | [diff] [blame] | 1604 | if (!ab) |
| 1605 | return; |
| 1606 | |
Amy Griffis | 9c937dc | 2006-06-08 23:19:31 -0400 | [diff] [blame] | 1607 | BUG_ON(!ab->skb); |
| 1608 | skb = ab->skb; |
| 1609 | avail = skb_tailroom(skb); |
| 1610 | new_len = slen + 3; /* enclosing quotes + null terminator */ |
| 1611 | if (new_len > avail) { |
| 1612 | avail = audit_expand(ab, new_len); |
| 1613 | if (!avail) |
| 1614 | return; |
| 1615 | } |
Arnaldo Carvalho de Melo | 27a884d | 2007-04-19 20:29:13 -0700 | [diff] [blame] | 1616 | ptr = skb_tail_pointer(skb); |
Amy Griffis | 9c937dc | 2006-06-08 23:19:31 -0400 | [diff] [blame] | 1617 | *ptr++ = '"'; |
| 1618 | memcpy(ptr, string, slen); |
| 1619 | ptr += slen; |
| 1620 | *ptr++ = '"'; |
| 1621 | *ptr = 0; |
| 1622 | skb_put(skb, slen + 2); /* don't include null terminator */ |
| 1623 | } |
| 1624 | |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1625 | /** |
Eric Paris | de6bbd1 | 2008-01-07 14:31:58 -0500 | [diff] [blame] | 1626 | * audit_string_contains_control - does a string need to be logged in hex |
Dave Jones | f706d5d | 2008-03-28 14:15:56 -0700 | [diff] [blame] | 1627 | * @string: string to be checked |
| 1628 | * @len: max length of the string to check |
Eric Paris | de6bbd1 | 2008-01-07 14:31:58 -0500 | [diff] [blame] | 1629 | */ |
Yaowei Bai | 9fcf836 | 2015-11-04 08:23:51 -0500 | [diff] [blame] | 1630 | bool audit_string_contains_control(const char *string, size_t len) |
Eric Paris | de6bbd1 | 2008-01-07 14:31:58 -0500 | [diff] [blame] | 1631 | { |
| 1632 | const unsigned char *p; |
Miloslav Trmac | b3897f5 | 2009-03-19 09:48:27 -0400 | [diff] [blame] | 1633 | for (p = string; p < (const unsigned char *)string + len; p++) { |
Vesa-Matti J Kari | 1d6c964 | 2008-07-23 00:06:13 +0300 | [diff] [blame] | 1634 | if (*p == '"' || *p < 0x21 || *p > 0x7e) |
Yaowei Bai | 9fcf836 | 2015-11-04 08:23:51 -0500 | [diff] [blame] | 1635 | return true; |
Eric Paris | de6bbd1 | 2008-01-07 14:31:58 -0500 | [diff] [blame] | 1636 | } |
Yaowei Bai | 9fcf836 | 2015-11-04 08:23:51 -0500 | [diff] [blame] | 1637 | return false; |
Eric Paris | de6bbd1 | 2008-01-07 14:31:58 -0500 | [diff] [blame] | 1638 | } |
| 1639 | |
| 1640 | /** |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 1641 | * audit_log_n_untrustedstring - log a string that may contain random characters |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1642 | * @ab: audit_buffer |
Dave Jones | f706d5d | 2008-03-28 14:15:56 -0700 | [diff] [blame] | 1643 | * @len: length of string (not including trailing null) |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1644 | * @string: string to be logged |
| 1645 | * |
| 1646 | * This code will escape a string that is passed to it if the string |
| 1647 | * contains a control character, unprintable character, double quote mark, |
Steve Grubb | 168b717 | 2005-05-19 10:24:22 +0100 | [diff] [blame] | 1648 | * or a space. Unescaped strings will start and end with a double quote mark. |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1649 | * Strings that are escaped are printed in hex (2 digits per char). |
Amy Griffis | 9c937dc | 2006-06-08 23:19:31 -0400 | [diff] [blame] | 1650 | * |
| 1651 | * The caller specifies the number of characters in the string to log, which may |
| 1652 | * or may not be the entire string. |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1653 | */ |
Eric Paris | b556f8a | 2008-04-18 10:12:59 -0400 | [diff] [blame] | 1654 | void audit_log_n_untrustedstring(struct audit_buffer *ab, const char *string, |
| 1655 | size_t len) |
| 83c7d09 | 2005-04-29 15:54:44 +0100 | [diff] [blame] | 1656 | { |
Eric Paris | de6bbd1 | 2008-01-07 14:31:58 -0500 | [diff] [blame] | 1657 | if (audit_string_contains_control(string, len)) |
Eric Paris | b556f8a | 2008-04-18 10:12:59 -0400 | [diff] [blame] | 1658 | audit_log_n_hex(ab, string, len); |
Eric Paris | de6bbd1 | 2008-01-07 14:31:58 -0500 | [diff] [blame] | 1659 | else |
Eric Paris | b556f8a | 2008-04-18 10:12:59 -0400 | [diff] [blame] | 1660 | audit_log_n_string(ab, string, len); |
| 83c7d09 | 2005-04-29 15:54:44 +0100 | [diff] [blame] | 1661 | } |
| 1662 | |
Amy Griffis | 9c937dc | 2006-06-08 23:19:31 -0400 | [diff] [blame] | 1663 | /** |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 1664 | * audit_log_untrustedstring - log a string that may contain random characters |
Amy Griffis | 9c937dc | 2006-06-08 23:19:31 -0400 | [diff] [blame] | 1665 | * @ab: audit_buffer |
| 1666 | * @string: string to be logged |
| 1667 | * |
Miloslav Trmac | 522ed77 | 2007-07-15 23:40:56 -0700 | [diff] [blame] | 1668 | * Same as audit_log_n_untrustedstring(), except that strlen is used to |
Amy Griffis | 9c937dc | 2006-06-08 23:19:31 -0400 | [diff] [blame] | 1669 | * determine string length. |
| 1670 | */ |
Eric Paris | de6bbd1 | 2008-01-07 14:31:58 -0500 | [diff] [blame] | 1671 | void audit_log_untrustedstring(struct audit_buffer *ab, const char *string) |
Amy Griffis | 9c937dc | 2006-06-08 23:19:31 -0400 | [diff] [blame] | 1672 | { |
Eric Paris | b556f8a | 2008-04-18 10:12:59 -0400 | [diff] [blame] | 1673 | audit_log_n_untrustedstring(ab, string, strlen(string)); |
Amy Griffis | 9c937dc | 2006-06-08 23:19:31 -0400 | [diff] [blame] | 1674 | } |
| 1675 | |
Steve Grubb | 168b717 | 2005-05-19 10:24:22 +0100 | [diff] [blame] | 1676 | /* This is a helper-function to print the escaped d_path */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1677 | void audit_log_d_path(struct audit_buffer *ab, const char *prefix, |
Al Viro | 66b3fad | 2012-03-14 21:48:20 -0400 | [diff] [blame] | 1678 | const struct path *path) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1679 | { |
Jan Blunck | 44707fd | 2008-02-14 19:38:33 -0800 | [diff] [blame] | 1680 | char *p, *pathname; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1681 | |
Chris Wright | 8fc6115 | 2005-05-06 15:54:17 +0100 | [diff] [blame] | 1682 | if (prefix) |
Kees Cook | c158a35 | 2012-01-06 14:07:10 -0800 | [diff] [blame] | 1683 | audit_log_format(ab, "%s", prefix); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1684 | |
Steve Grubb | 168b717 | 2005-05-19 10:24:22 +0100 | [diff] [blame] | 1685 | /* We will allow 11 spaces for ' (deleted)' to be appended */ |
Jan Blunck | 44707fd | 2008-02-14 19:38:33 -0800 | [diff] [blame] | 1686 | pathname = kmalloc(PATH_MAX+11, ab->gfp_mask); |
| 1687 | if (!pathname) { |
Eric Paris | def5754 | 2009-03-10 18:00:14 -0400 | [diff] [blame] | 1688 | audit_log_string(ab, "<no_memory>"); |
Steve Grubb | 168b717 | 2005-05-19 10:24:22 +0100 | [diff] [blame] | 1689 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1690 | } |
Jan Blunck | cf28b48 | 2008-02-14 19:38:44 -0800 | [diff] [blame] | 1691 | p = d_path(path, pathname, PATH_MAX+11); |
Steve Grubb | 168b717 | 2005-05-19 10:24:22 +0100 | [diff] [blame] | 1692 | if (IS_ERR(p)) { /* Should never happen since we send PATH_MAX */ |
| 1693 | /* FIXME: can we save some information here? */ |
Eric Paris | def5754 | 2009-03-10 18:00:14 -0400 | [diff] [blame] | 1694 | audit_log_string(ab, "<too_long>"); |
Daniel Walker | 5600b89 | 2007-10-18 03:06:10 -0700 | [diff] [blame] | 1695 | } else |
Steve Grubb | 168b717 | 2005-05-19 10:24:22 +0100 | [diff] [blame] | 1696 | audit_log_untrustedstring(ab, p); |
Jan Blunck | 44707fd | 2008-02-14 19:38:33 -0800 | [diff] [blame] | 1697 | kfree(pathname); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1698 | } |
| 1699 | |
Eric Paris | 4d3fb70 | 2013-04-30 09:53:34 -0400 | [diff] [blame] | 1700 | void audit_log_session_info(struct audit_buffer *ab) |
| 1701 | { |
Eric Paris | 4440e85 | 2013-11-27 17:35:17 -0500 | [diff] [blame] | 1702 | unsigned int sessionid = audit_get_sessionid(current); |
Eric Paris | 4d3fb70 | 2013-04-30 09:53:34 -0400 | [diff] [blame] | 1703 | uid_t auid = from_kuid(&init_user_ns, audit_get_loginuid(current)); |
| 1704 | |
Richard Guy Briggs | b8f89ca | 2013-09-18 11:17:43 -0400 | [diff] [blame] | 1705 | audit_log_format(ab, " auid=%u ses=%u", auid, sessionid); |
Eric Paris | 4d3fb70 | 2013-04-30 09:53:34 -0400 | [diff] [blame] | 1706 | } |
| 1707 | |
Eric Paris | 9d96098 | 2009-06-11 14:31:37 -0400 | [diff] [blame] | 1708 | void audit_log_key(struct audit_buffer *ab, char *key) |
| 1709 | { |
| 1710 | audit_log_format(ab, " key="); |
| 1711 | if (key) |
| 1712 | audit_log_untrustedstring(ab, key); |
| 1713 | else |
| 1714 | audit_log_format(ab, "(null)"); |
| 1715 | } |
| 1716 | |
Eric Paris | b24a30a | 2013-04-30 15:30:32 -0400 | [diff] [blame] | 1717 | void audit_log_cap(struct audit_buffer *ab, char *prefix, kernel_cap_t *cap) |
| 1718 | { |
| 1719 | int i; |
| 1720 | |
| 1721 | audit_log_format(ab, " %s=", prefix); |
| 1722 | CAP_FOR_EACH_U32(i) { |
| 1723 | audit_log_format(ab, "%08x", |
Eric Paris | 7d8b6c6 | 2014-07-23 15:36:26 -0400 | [diff] [blame] | 1724 | cap->cap[CAP_LAST_U32 - i]); |
Eric Paris | b24a30a | 2013-04-30 15:30:32 -0400 | [diff] [blame] | 1725 | } |
| 1726 | } |
| 1727 | |
Richard Guy Briggs | 691e6d5 | 2014-05-26 11:02:48 -0400 | [diff] [blame] | 1728 | static void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name) |
Eric Paris | b24a30a | 2013-04-30 15:30:32 -0400 | [diff] [blame] | 1729 | { |
| 1730 | kernel_cap_t *perm = &name->fcap.permitted; |
| 1731 | kernel_cap_t *inh = &name->fcap.inheritable; |
| 1732 | int log = 0; |
| 1733 | |
| 1734 | if (!cap_isclear(*perm)) { |
| 1735 | audit_log_cap(ab, "cap_fp", perm); |
| 1736 | log = 1; |
| 1737 | } |
| 1738 | if (!cap_isclear(*inh)) { |
| 1739 | audit_log_cap(ab, "cap_fi", inh); |
| 1740 | log = 1; |
| 1741 | } |
| 1742 | |
| 1743 | if (log) |
| 1744 | audit_log_format(ab, " cap_fe=%d cap_fver=%x", |
| 1745 | name->fcap.fE, name->fcap_ver); |
| 1746 | } |
| 1747 | |
| 1748 | static inline int audit_copy_fcaps(struct audit_names *name, |
| 1749 | const struct dentry *dentry) |
| 1750 | { |
| 1751 | struct cpu_vfs_cap_data caps; |
| 1752 | int rc; |
| 1753 | |
| 1754 | if (!dentry) |
| 1755 | return 0; |
| 1756 | |
| 1757 | rc = get_vfs_caps_from_disk(dentry, &caps); |
| 1758 | if (rc) |
| 1759 | return rc; |
| 1760 | |
| 1761 | name->fcap.permitted = caps.permitted; |
| 1762 | name->fcap.inheritable = caps.inheritable; |
| 1763 | name->fcap.fE = !!(caps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE); |
| 1764 | name->fcap_ver = (caps.magic_etc & VFS_CAP_REVISION_MASK) >> |
| 1765 | VFS_CAP_REVISION_SHIFT; |
| 1766 | |
| 1767 | return 0; |
| 1768 | } |
| 1769 | |
| 1770 | /* Copy inode data into an audit_names. */ |
| 1771 | void audit_copy_inode(struct audit_names *name, const struct dentry *dentry, |
Andreas Gruenbacher | d6335d7 | 2015-12-24 11:09:39 -0500 | [diff] [blame] | 1772 | struct inode *inode) |
Eric Paris | b24a30a | 2013-04-30 15:30:32 -0400 | [diff] [blame] | 1773 | { |
| 1774 | name->ino = inode->i_ino; |
| 1775 | name->dev = inode->i_sb->s_dev; |
| 1776 | name->mode = inode->i_mode; |
| 1777 | name->uid = inode->i_uid; |
| 1778 | name->gid = inode->i_gid; |
| 1779 | name->rdev = inode->i_rdev; |
| 1780 | security_inode_getsecid(inode, &name->osid); |
| 1781 | audit_copy_fcaps(name, dentry); |
| 1782 | } |
| 1783 | |
| 1784 | /** |
| 1785 | * audit_log_name - produce AUDIT_PATH record from struct audit_names |
| 1786 | * @context: audit_context for the task |
| 1787 | * @n: audit_names structure with reportable details |
| 1788 | * @path: optional path to report instead of audit_names->name |
| 1789 | * @record_num: record number to report when handling a list of names |
| 1790 | * @call_panic: optional pointer to int that will be updated if secid fails |
| 1791 | */ |
| 1792 | void audit_log_name(struct audit_context *context, struct audit_names *n, |
| 1793 | struct path *path, int record_num, int *call_panic) |
| 1794 | { |
| 1795 | struct audit_buffer *ab; |
| 1796 | ab = audit_log_start(context, GFP_KERNEL, AUDIT_PATH); |
| 1797 | if (!ab) |
| 1798 | return; |
| 1799 | |
| 1800 | audit_log_format(ab, "item=%d", record_num); |
| 1801 | |
| 1802 | if (path) |
| 1803 | audit_log_d_path(ab, " name=", path); |
| 1804 | else if (n->name) { |
| 1805 | switch (n->name_len) { |
| 1806 | case AUDIT_NAME_FULL: |
| 1807 | /* log the full path */ |
| 1808 | audit_log_format(ab, " name="); |
| 1809 | audit_log_untrustedstring(ab, n->name->name); |
| 1810 | break; |
| 1811 | case 0: |
| 1812 | /* name was specified as a relative path and the |
| 1813 | * directory component is the cwd */ |
| 1814 | audit_log_d_path(ab, " name=", &context->pwd); |
| 1815 | break; |
| 1816 | default: |
| 1817 | /* log the name's directory component */ |
| 1818 | audit_log_format(ab, " name="); |
| 1819 | audit_log_n_untrustedstring(ab, n->name->name, |
| 1820 | n->name_len); |
| 1821 | } |
| 1822 | } else |
| 1823 | audit_log_format(ab, " name=(null)"); |
| 1824 | |
Linus Torvalds | 425afcf | 2015-09-08 13:34:59 -0700 | [diff] [blame] | 1825 | if (n->ino != AUDIT_INO_UNSET) |
Eric Paris | b24a30a | 2013-04-30 15:30:32 -0400 | [diff] [blame] | 1826 | audit_log_format(ab, " inode=%lu" |
| 1827 | " dev=%02x:%02x mode=%#ho" |
| 1828 | " ouid=%u ogid=%u rdev=%02x:%02x", |
| 1829 | n->ino, |
| 1830 | MAJOR(n->dev), |
| 1831 | MINOR(n->dev), |
| 1832 | n->mode, |
| 1833 | from_kuid(&init_user_ns, n->uid), |
| 1834 | from_kgid(&init_user_ns, n->gid), |
| 1835 | MAJOR(n->rdev), |
| 1836 | MINOR(n->rdev)); |
Eric Paris | b24a30a | 2013-04-30 15:30:32 -0400 | [diff] [blame] | 1837 | if (n->osid != 0) { |
| 1838 | char *ctx = NULL; |
| 1839 | u32 len; |
| 1840 | if (security_secid_to_secctx( |
| 1841 | n->osid, &ctx, &len)) { |
| 1842 | audit_log_format(ab, " osid=%u", n->osid); |
| 1843 | if (call_panic) |
| 1844 | *call_panic = 2; |
| 1845 | } else { |
| 1846 | audit_log_format(ab, " obj=%s", ctx); |
| 1847 | security_release_secctx(ctx, len); |
| 1848 | } |
| 1849 | } |
| 1850 | |
Jeff Layton | d3aea84 | 2013-05-08 10:32:23 -0400 | [diff] [blame] | 1851 | /* log the audit_names record type */ |
| 1852 | audit_log_format(ab, " nametype="); |
| 1853 | switch(n->type) { |
| 1854 | case AUDIT_TYPE_NORMAL: |
| 1855 | audit_log_format(ab, "NORMAL"); |
| 1856 | break; |
| 1857 | case AUDIT_TYPE_PARENT: |
| 1858 | audit_log_format(ab, "PARENT"); |
| 1859 | break; |
| 1860 | case AUDIT_TYPE_CHILD_DELETE: |
| 1861 | audit_log_format(ab, "DELETE"); |
| 1862 | break; |
| 1863 | case AUDIT_TYPE_CHILD_CREATE: |
| 1864 | audit_log_format(ab, "CREATE"); |
| 1865 | break; |
| 1866 | default: |
| 1867 | audit_log_format(ab, "UNKNOWN"); |
| 1868 | break; |
| 1869 | } |
| 1870 | |
Eric Paris | b24a30a | 2013-04-30 15:30:32 -0400 | [diff] [blame] | 1871 | audit_log_fcaps(ab, n); |
| 1872 | audit_log_end(ab); |
| 1873 | } |
| 1874 | |
| 1875 | int audit_log_task_context(struct audit_buffer *ab) |
| 1876 | { |
| 1877 | char *ctx = NULL; |
| 1878 | unsigned len; |
| 1879 | int error; |
| 1880 | u32 sid; |
| 1881 | |
| 1882 | security_task_getsecid(current, &sid); |
| 1883 | if (!sid) |
| 1884 | return 0; |
| 1885 | |
| 1886 | error = security_secid_to_secctx(sid, &ctx, &len); |
| 1887 | if (error) { |
| 1888 | if (error != -EINVAL) |
| 1889 | goto error_path; |
| 1890 | return 0; |
| 1891 | } |
| 1892 | |
| 1893 | audit_log_format(ab, " subj=%s", ctx); |
| 1894 | security_release_secctx(ctx, len); |
| 1895 | return 0; |
| 1896 | |
| 1897 | error_path: |
| 1898 | audit_panic("error in audit_log_task_context"); |
| 1899 | return error; |
| 1900 | } |
| 1901 | EXPORT_SYMBOL(audit_log_task_context); |
| 1902 | |
Davidlohr Bueso | 4766b19 | 2015-02-22 18:20:00 -0800 | [diff] [blame] | 1903 | void audit_log_d_path_exe(struct audit_buffer *ab, |
| 1904 | struct mm_struct *mm) |
| 1905 | { |
Davidlohr Bueso | 5b28255 | 2015-02-22 18:20:09 -0800 | [diff] [blame] | 1906 | struct file *exe_file; |
Davidlohr Bueso | 4766b19 | 2015-02-22 18:20:00 -0800 | [diff] [blame] | 1907 | |
Davidlohr Bueso | 5b28255 | 2015-02-22 18:20:09 -0800 | [diff] [blame] | 1908 | if (!mm) |
| 1909 | goto out_null; |
| 1910 | |
| 1911 | exe_file = get_mm_exe_file(mm); |
| 1912 | if (!exe_file) |
| 1913 | goto out_null; |
| 1914 | |
| 1915 | audit_log_d_path(ab, " exe=", &exe_file->f_path); |
| 1916 | fput(exe_file); |
| 1917 | return; |
| 1918 | out_null: |
| 1919 | audit_log_format(ab, " exe=(null)"); |
Davidlohr Bueso | 4766b19 | 2015-02-22 18:20:00 -0800 | [diff] [blame] | 1920 | } |
| 1921 | |
Richard Guy Briggs | 3f5be2d | 2016-06-28 12:07:50 -0400 | [diff] [blame] | 1922 | struct tty_struct *audit_get_tty(struct task_struct *tsk) |
| 1923 | { |
| 1924 | struct tty_struct *tty = NULL; |
| 1925 | unsigned long flags; |
| 1926 | |
| 1927 | spin_lock_irqsave(&tsk->sighand->siglock, flags); |
| 1928 | if (tsk->signal) |
| 1929 | tty = tty_kref_get(tsk->signal->tty); |
| 1930 | spin_unlock_irqrestore(&tsk->sighand->siglock, flags); |
| 1931 | return tty; |
| 1932 | } |
| 1933 | |
| 1934 | void audit_put_tty(struct tty_struct *tty) |
| 1935 | { |
| 1936 | tty_kref_put(tty); |
| 1937 | } |
| 1938 | |
Eric Paris | b24a30a | 2013-04-30 15:30:32 -0400 | [diff] [blame] | 1939 | void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk) |
| 1940 | { |
| 1941 | const struct cred *cred; |
Richard Guy Briggs | 9eab339 | 2014-03-15 18:42:34 -0400 | [diff] [blame] | 1942 | char comm[sizeof(tsk->comm)]; |
Richard Guy Briggs | db0a6fb | 2016-04-21 14:14:01 -0400 | [diff] [blame] | 1943 | struct tty_struct *tty; |
Eric Paris | b24a30a | 2013-04-30 15:30:32 -0400 | [diff] [blame] | 1944 | |
| 1945 | if (!ab) |
| 1946 | return; |
| 1947 | |
| 1948 | /* tsk == current */ |
| 1949 | cred = current_cred(); |
Richard Guy Briggs | db0a6fb | 2016-04-21 14:14:01 -0400 | [diff] [blame] | 1950 | tty = audit_get_tty(tsk); |
Eric Paris | b24a30a | 2013-04-30 15:30:32 -0400 | [diff] [blame] | 1951 | audit_log_format(ab, |
Richard Guy Briggs | c92cdeb | 2013-12-10 22:10:41 -0500 | [diff] [blame] | 1952 | " ppid=%d pid=%d auid=%u uid=%u gid=%u" |
Eric Paris | b24a30a | 2013-04-30 15:30:32 -0400 | [diff] [blame] | 1953 | " euid=%u suid=%u fsuid=%u" |
Richard Guy Briggs | 2f2ad10 | 2013-07-15 10:23:11 -0400 | [diff] [blame] | 1954 | " egid=%u sgid=%u fsgid=%u tty=%s ses=%u", |
Richard Guy Briggs | c92cdeb | 2013-12-10 22:10:41 -0500 | [diff] [blame] | 1955 | task_ppid_nr(tsk), |
Paul Moore | fa2bea2 | 2016-08-30 17:19:13 -0400 | [diff] [blame] | 1956 | task_tgid_nr(tsk), |
Eric Paris | b24a30a | 2013-04-30 15:30:32 -0400 | [diff] [blame] | 1957 | from_kuid(&init_user_ns, audit_get_loginuid(tsk)), |
| 1958 | from_kuid(&init_user_ns, cred->uid), |
| 1959 | from_kgid(&init_user_ns, cred->gid), |
| 1960 | from_kuid(&init_user_ns, cred->euid), |
| 1961 | from_kuid(&init_user_ns, cred->suid), |
| 1962 | from_kuid(&init_user_ns, cred->fsuid), |
| 1963 | from_kgid(&init_user_ns, cred->egid), |
| 1964 | from_kgid(&init_user_ns, cred->sgid), |
| 1965 | from_kgid(&init_user_ns, cred->fsgid), |
Richard Guy Briggs | db0a6fb | 2016-04-21 14:14:01 -0400 | [diff] [blame] | 1966 | tty ? tty_name(tty) : "(none)", |
| 1967 | audit_get_sessionid(tsk)); |
| 1968 | audit_put_tty(tty); |
Eric Paris | b24a30a | 2013-04-30 15:30:32 -0400 | [diff] [blame] | 1969 | audit_log_format(ab, " comm="); |
Richard Guy Briggs | 9eab339 | 2014-03-15 18:42:34 -0400 | [diff] [blame] | 1970 | audit_log_untrustedstring(ab, get_task_comm(comm, tsk)); |
Davidlohr Bueso | 4766b19 | 2015-02-22 18:20:00 -0800 | [diff] [blame] | 1971 | audit_log_d_path_exe(ab, tsk->mm); |
Eric Paris | b24a30a | 2013-04-30 15:30:32 -0400 | [diff] [blame] | 1972 | audit_log_task_context(ab); |
| 1973 | } |
| 1974 | EXPORT_SYMBOL(audit_log_task_info); |
| 1975 | |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 1976 | /** |
Kees Cook | a51d9ea | 2012-07-25 17:29:08 -0700 | [diff] [blame] | 1977 | * audit_log_link_denied - report a link restriction denial |
Shailendra Verma | 22011964 | 2015-05-23 10:40:27 +0530 | [diff] [blame] | 1978 | * @operation: specific link operation |
Kees Cook | a51d9ea | 2012-07-25 17:29:08 -0700 | [diff] [blame] | 1979 | * @link: the path that triggered the restriction |
| 1980 | */ |
| 1981 | void audit_log_link_denied(const char *operation, struct path *link) |
| 1982 | { |
| 1983 | struct audit_buffer *ab; |
Eric Paris | b24a30a | 2013-04-30 15:30:32 -0400 | [diff] [blame] | 1984 | struct audit_names *name; |
Kees Cook | a51d9ea | 2012-07-25 17:29:08 -0700 | [diff] [blame] | 1985 | |
Eric Paris | b24a30a | 2013-04-30 15:30:32 -0400 | [diff] [blame] | 1986 | name = kzalloc(sizeof(*name), GFP_NOFS); |
| 1987 | if (!name) |
| 1988 | return; |
| 1989 | |
| 1990 | /* Generate AUDIT_ANOM_LINK with subject, operation, outcome. */ |
Kees Cook | a51d9ea | 2012-07-25 17:29:08 -0700 | [diff] [blame] | 1991 | ab = audit_log_start(current->audit_context, GFP_KERNEL, |
| 1992 | AUDIT_ANOM_LINK); |
Sasha Levin | d1c7d97 | 2012-10-04 19:57:31 -0400 | [diff] [blame] | 1993 | if (!ab) |
Eric Paris | b24a30a | 2013-04-30 15:30:32 -0400 | [diff] [blame] | 1994 | goto out; |
| 1995 | audit_log_format(ab, "op=%s", operation); |
| 1996 | audit_log_task_info(ab, current); |
| 1997 | audit_log_format(ab, " res=0"); |
Kees Cook | a51d9ea | 2012-07-25 17:29:08 -0700 | [diff] [blame] | 1998 | audit_log_end(ab); |
Eric Paris | b24a30a | 2013-04-30 15:30:32 -0400 | [diff] [blame] | 1999 | |
| 2000 | /* Generate AUDIT_PATH record with object. */ |
| 2001 | name->type = AUDIT_TYPE_NORMAL; |
David Howells | 3b36215 | 2015-03-17 22:26:21 +0000 | [diff] [blame] | 2002 | audit_copy_inode(name, link->dentry, d_backing_inode(link->dentry)); |
Eric Paris | b24a30a | 2013-04-30 15:30:32 -0400 | [diff] [blame] | 2003 | audit_log_name(current->audit_context, name, link, 0, NULL); |
| 2004 | out: |
| 2005 | kfree(name); |
Kees Cook | a51d9ea | 2012-07-25 17:29:08 -0700 | [diff] [blame] | 2006 | } |
| 2007 | |
| 2008 | /** |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 2009 | * audit_log_end - end one audit record |
| 2010 | * @ab: the audit_buffer |
| 2011 | * |
Richard Guy Briggs | 451f921 | 2014-04-22 21:31:57 -0400 | [diff] [blame] | 2012 | * netlink_unicast() cannot be called inside an irq context because it blocks |
| 2013 | * (last arg, flags, is not set to MSG_DONTWAIT), so the audit buffer is placed |
| 2014 | * on a queue and a tasklet is scheduled to remove them from the queue outside |
| 2015 | * the irq context. May be called in any context. |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 2016 | */ |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 2017 | void audit_log_end(struct audit_buffer *ab) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2018 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2019 | if (!ab) |
| 2020 | return; |
| 2021 | if (!audit_rate_check()) { |
| 2022 | audit_log_lost("rate limit exceeded"); |
| 2023 | } else { |
Steve Grubb | 8d07a67 | 2008-02-21 16:59:22 -0500 | [diff] [blame] | 2024 | struct nlmsghdr *nlh = nlmsg_hdr(ab->skb); |
Richard Guy Briggs | 451f921 | 2014-04-22 21:31:57 -0400 | [diff] [blame] | 2025 | |
Richard Guy Briggs | 54e05ed | 2014-08-21 13:40:41 -0400 | [diff] [blame] | 2026 | nlh->nlmsg_len = ab->skb->len; |
Richard Guy Briggs | 54dc77d | 2014-12-18 23:09:27 -0500 | [diff] [blame] | 2027 | kauditd_send_multicast_skb(ab->skb, ab->gfp_mask); |
Richard Guy Briggs | 451f921 | 2014-04-22 21:31:57 -0400 | [diff] [blame] | 2028 | |
| 2029 | /* |
| 2030 | * The original kaudit unicast socket sends up messages with |
| 2031 | * nlmsg_len set to the payload length rather than the entire |
| 2032 | * message length. This breaks the standard set by netlink. |
| 2033 | * The existing auditd daemon assumes this breakage. Fixing |
| 2034 | * this would require co-ordinating a change in the established |
| 2035 | * protocol between the kaudit kernel subsystem and the auditd |
| 2036 | * userspace code. |
| 2037 | */ |
Richard Guy Briggs | 54e05ed | 2014-08-21 13:40:41 -0400 | [diff] [blame] | 2038 | nlh->nlmsg_len -= NLMSG_HDRLEN; |
Eric Paris | f3d357b | 2008-04-18 10:02:28 -0400 | [diff] [blame] | 2039 | |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 2040 | if (audit_pid) { |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 2041 | skb_queue_tail(&audit_skb_queue, ab->skb); |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 2042 | wake_up_interruptible(&kauditd_wait); |
Eric Paris | f3d357b | 2008-04-18 10:02:28 -0400 | [diff] [blame] | 2043 | } else { |
Eric Paris | 038cbcf | 2009-06-11 14:31:35 -0400 | [diff] [blame] | 2044 | audit_printk_skb(ab->skb); |
David Woodhouse | b7d1125 | 2005-05-19 10:56:58 +0100 | [diff] [blame] | 2045 | } |
Eric Paris | f3d357b | 2008-04-18 10:02:28 -0400 | [diff] [blame] | 2046 | ab->skb = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2047 | } |
Chris Wright | 16e1904 | 2005-05-06 15:53:34 +0100 | [diff] [blame] | 2048 | audit_buffer_free(ab); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2049 | } |
| 2050 | |
Randy Dunlap | b0dd25a | 2005-09-13 12:47:11 -0700 | [diff] [blame] | 2051 | /** |
| 2052 | * audit_log - Log an audit record |
| 2053 | * @ctx: audit context |
| 2054 | * @gfp_mask: type of allocation |
| 2055 | * @type: audit message type |
| 2056 | * @fmt: format string to use |
| 2057 | * @...: variable parameters matching the format string |
| 2058 | * |
| 2059 | * This is a convenience function that calls audit_log_start, |
| 2060 | * audit_log_vformat, and audit_log_end. It may be called |
| 2061 | * in any context. |
| 2062 | */ |
Daniel Walker | 5600b89 | 2007-10-18 03:06:10 -0700 | [diff] [blame] | 2063 | void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type, |
David Woodhouse | 9ad9ad3 | 2005-06-22 15:04:33 +0100 | [diff] [blame] | 2064 | const char *fmt, ...) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2065 | { |
| 2066 | struct audit_buffer *ab; |
| 2067 | va_list args; |
| 2068 | |
David Woodhouse | 9ad9ad3 | 2005-06-22 15:04:33 +0100 | [diff] [blame] | 2069 | ab = audit_log_start(ctx, gfp_mask, type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2070 | if (ab) { |
| 2071 | va_start(args, fmt); |
| 2072 | audit_log_vformat(ab, fmt, args); |
| 2073 | va_end(args); |
| 2074 | audit_log_end(ab); |
| 2075 | } |
| 2076 | } |
lorenzo@gnu.org | bf45da9 | 2006-03-09 00:33:47 +0100 | [diff] [blame] | 2077 | |
Mr Dash Four | 131ad62 | 2011-06-30 13:31:57 +0200 | [diff] [blame] | 2078 | #ifdef CONFIG_SECURITY |
| 2079 | /** |
| 2080 | * audit_log_secctx - Converts and logs SELinux context |
| 2081 | * @ab: audit_buffer |
| 2082 | * @secid: security number |
| 2083 | * |
| 2084 | * This is a helper function that calls security_secid_to_secctx to convert |
| 2085 | * secid to secctx and then adds the (converted) SELinux context to the audit |
| 2086 | * log by calling audit_log_format, thus also preventing leak of internal secid |
| 2087 | * to userspace. If secid cannot be converted audit_panic is called. |
| 2088 | */ |
| 2089 | void audit_log_secctx(struct audit_buffer *ab, u32 secid) |
| 2090 | { |
| 2091 | u32 len; |
| 2092 | char *secctx; |
| 2093 | |
| 2094 | if (security_secid_to_secctx(secid, &secctx, &len)) { |
| 2095 | audit_panic("Cannot convert secid to context"); |
| 2096 | } else { |
| 2097 | audit_log_format(ab, " obj=%s", secctx); |
| 2098 | security_release_secctx(secctx, len); |
| 2099 | } |
| 2100 | } |
| 2101 | EXPORT_SYMBOL(audit_log_secctx); |
| 2102 | #endif |
| 2103 | |
lorenzo@gnu.org | bf45da9 | 2006-03-09 00:33:47 +0100 | [diff] [blame] | 2104 | EXPORT_SYMBOL(audit_log_start); |
| 2105 | EXPORT_SYMBOL(audit_log_end); |
| 2106 | EXPORT_SYMBOL(audit_log_format); |
| 2107 | EXPORT_SYMBOL(audit_log); |