blob: c929bf4a3df1c0b005996cb04b620d9ff0f40854 [file] [log] [blame]
Thomas Gleixnerb886d83c2019-06-01 10:08:55 +02001// SPDX-License-Identifier: GPL-2.0-only
John Johansen63e2b422010-07-29 14:48:03 -07002/*
3 * AppArmor security module
4 *
5 * This file contains AppArmor /proc/<pid>/attr/ interface functions
6 *
7 * Copyright (C) 1998-2008 Novell/SUSE
8 * Copyright 2009-2010 Canonical Ltd.
John Johansen63e2b422010-07-29 14:48:03 -07009 */
10
11#include "include/apparmor.h"
John Johansend8889d42017-10-11 01:04:48 -070012#include "include/cred.h"
John Johansen63e2b422010-07-29 14:48:03 -070013#include "include/policy.h"
John Johansencff281f2017-01-16 00:42:15 -080014#include "include/policy_ns.h"
John Johansen63e2b422010-07-29 14:48:03 -070015#include "include/domain.h"
James Morriscc7db092011-08-29 11:45:44 +100016#include "include/procattr.h"
John Johansen63e2b422010-07-29 14:48:03 -070017
18
19/**
20 * aa_getprocattr - Return the profile information for @profile
21 * @profile: the profile to print profile info about (NOT NULL)
22 * @string: Returns - string containing the profile info (NOT NULL)
23 *
24 * Returns: length of @string on success else error on failure
25 *
26 * Requires: profile != NULL
27 *
28 * Creates a string containing the namespace_name://profile_name for
29 * @profile.
30 *
31 * Returns: size of string placed in @string else error code on failure
32 */
John Johansen76a1d262017-06-09 12:47:17 -070033int aa_getprocattr(struct aa_label *label, char **string)
John Johansen63e2b422010-07-29 14:48:03 -070034{
John Johansen76a1d262017-06-09 12:47:17 -070035 struct aa_ns *ns = labels_ns(label);
John Johansencf797c02017-06-09 02:08:28 -070036 struct aa_ns *current_ns = aa_get_current_ns();
John Johansen76a1d262017-06-09 12:47:17 -070037 int len;
John Johansen63e2b422010-07-29 14:48:03 -070038
John Johansen76a1d262017-06-09 12:47:17 -070039 if (!aa_ns_visible(current_ns, ns, true)) {
40 aa_put_ns(current_ns);
John Johansen63e2b422010-07-29 14:48:03 -070041 return -EACCES;
John Johansen63e2b422010-07-29 14:48:03 -070042 }
John Johansen63e2b422010-07-29 14:48:03 -070043
John Johansen76a1d262017-06-09 12:47:17 -070044 len = aa_label_snxprint(NULL, 0, current_ns, label,
45 FLAG_SHOW_MODE | FLAG_VIEW_SUBNS |
46 FLAG_HIDDEN_UNCONFINED);
47 AA_BUG(len < 0);
48
49 *string = kmalloc(len + 2, GFP_KERNEL);
50 if (!*string) {
51 aa_put_ns(current_ns);
52 return -ENOMEM;
53 }
54
55 len = aa_label_snxprint(*string, len + 2, current_ns, label,
56 FLAG_SHOW_MODE | FLAG_VIEW_SUBNS |
57 FLAG_HIDDEN_UNCONFINED);
58 if (len < 0) {
59 aa_put_ns(current_ns);
60 return len;
61 }
62
63 (*string)[len] = '\n';
64 (*string)[len + 1] = 0;
65
66 aa_put_ns(current_ns);
67 return len + 1;
John Johansen63e2b422010-07-29 14:48:03 -070068}
69
70/**
71 * split_token_from_name - separate a string of form <token>^<name>
72 * @op: operation being checked
73 * @args: string to parse (NOT NULL)
74 * @token: stores returned parsed token value (NOT NULL)
75 *
76 * Returns: start position of name after token else NULL on failure
77 */
John Johansen47f6e5c2017-01-16 00:43:01 -080078static char *split_token_from_name(const char *op, char *args, u64 *token)
John Johansen63e2b422010-07-29 14:48:03 -070079{
80 char *name;
81
82 *token = simple_strtoull(args, &name, 16);
83 if ((name == args) || *name != '^') {
John Johansen47f6e5c2017-01-16 00:43:01 -080084 AA_ERROR("%s: Invalid input '%s'", op, args);
John Johansen63e2b422010-07-29 14:48:03 -070085 return ERR_PTR(-EINVAL);
86 }
87
88 name++; /* skip ^ */
89 if (!*name)
90 name = NULL;
91 return name;
92}
93
94/**
95 * aa_setprocattr_chagnehat - handle procattr interface to change_hat
96 * @args: args received from writing to /proc/<pid>/attr/current (NOT NULL)
97 * @size: size of the args
John Johansendf8073c2017-06-09 11:36:48 -070098 * @flags: set of flags governing behavior
John Johansen63e2b422010-07-29 14:48:03 -070099 *
100 * Returns: %0 or error code if change_hat fails
101 */
John Johansendf8073c2017-06-09 11:36:48 -0700102int aa_setprocattr_changehat(char *args, size_t size, int flags)
John Johansen63e2b422010-07-29 14:48:03 -0700103{
104 char *hat;
105 u64 token;
106 const char *hats[16]; /* current hard limit on # of names */
107 int count = 0;
108
109 hat = split_token_from_name(OP_CHANGE_HAT, args, &token);
110 if (IS_ERR(hat))
111 return PTR_ERR(hat);
112
113 if (!hat && !token) {
114 AA_ERROR("change_hat: Invalid input, NULL hat and NULL magic");
115 return -EINVAL;
116 }
117
118 if (hat) {
119 /* set up hat name vector, args guaranteed null terminated
120 * at args[size] by setprocattr.
121 *
122 * If there are multiple hat names in the buffer each is
123 * separated by a \0. Ie. userspace writes them pre tokenized
124 */
125 char *end = args + size;
126 for (count = 0; (hat < end) && count < 16; ++count) {
127 char *next = hat + strlen(hat) + 1;
128 hats[count] = hat;
John Johansenc3e1e582017-01-16 00:43:05 -0800129 AA_DEBUG("%s: (pid %d) Magic 0x%llx count %d hat '%s'\n"
130 , __func__, current->pid, token, count, hat);
John Johansen63e2b422010-07-29 14:48:03 -0700131 hat = next;
132 }
John Johansenc3e1e582017-01-16 00:43:05 -0800133 } else
134 AA_DEBUG("%s: (pid %d) Magic 0x%llx count %d Hat '%s'\n",
135 __func__, current->pid, token, count, "<NULL>");
John Johansen63e2b422010-07-29 14:48:03 -0700136
John Johansendf8073c2017-06-09 11:36:48 -0700137 return aa_change_hat(hats, count, token, flags);
John Johansen63e2b422010-07-29 14:48:03 -0700138}