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0ed3b28a JJ |
1 | /* |
2 | * AppArmor security module | |
3 | * | |
4 | * This file contains AppArmor capability mediation functions | |
5 | * | |
6 | * Copyright (C) 1998-2008 Novell/SUSE | |
7 | * Copyright 2009-2010 Canonical Ltd. | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License as | |
11 | * published by the Free Software Foundation, version 2 of the | |
12 | * License. | |
13 | */ | |
14 | ||
15 | #include <linux/capability.h> | |
16 | #include <linux/errno.h> | |
17 | #include <linux/gfp.h> | |
12eb87d5 | 18 | #include <linux/security.h> |
0ed3b28a JJ |
19 | |
20 | #include "include/apparmor.h" | |
21 | #include "include/capability.h" | |
22 | #include "include/context.h" | |
23 | #include "include/policy.h" | |
24 | #include "include/audit.h" | |
25 | ||
26 | /* | |
27 | * Table of capability names: we generate it from capabilities.h. | |
28 | */ | |
29 | #include "capability_names.h" | |
30 | ||
84f1f787 JJ |
31 | struct aa_fs_entry aa_fs_entry_caps[] = { |
32 | AA_FS_FILE_STRING("mask", AA_FS_CAPS_MASK), | |
33 | { } | |
34 | }; | |
35 | ||
0ed3b28a JJ |
36 | struct audit_cache { |
37 | struct aa_profile *profile; | |
38 | kernel_cap_t caps; | |
39 | }; | |
40 | ||
41 | static DEFINE_PER_CPU(struct audit_cache, audit_cache); | |
42 | ||
43 | /** | |
44 | * audit_cb - call back for capability components of audit struct | |
45 | * @ab - audit buffer (NOT NULL) | |
46 | * @va - audit struct to audit data from (NOT NULL) | |
47 | */ | |
48 | static void audit_cb(struct audit_buffer *ab, void *va) | |
49 | { | |
50 | struct common_audit_data *sa = va; | |
51 | audit_log_format(ab, " capname="); | |
52 | audit_log_untrustedstring(ab, capability_names[sa->u.cap]); | |
53 | } | |
54 | ||
55 | /** | |
56 | * audit_caps - audit a capability | |
dd0c6e86 | 57 | * @profile: profile being tested for confinement (NOT NULL) |
0ed3b28a | 58 | * @cap: capability tested |
12eb87d5 | 59 | @audit: whether an audit record should be generated |
0ed3b28a JJ |
60 | * @error: error code returned by test |
61 | * | |
62 | * Do auditing of capability and handle, audit/complain/kill modes switching | |
63 | * and duplicate message elimination. | |
64 | * | |
65 | * Returns: 0 or sa->error on success, error code on failure | |
66 | */ | |
12eb87d5 JJ |
67 | static int audit_caps(struct aa_profile *profile, int cap, int audit, |
68 | int error) | |
0ed3b28a JJ |
69 | { |
70 | struct audit_cache *ent; | |
71 | int type = AUDIT_APPARMOR_AUTO; | |
ef88a7ac | 72 | DEFINE_AUDIT_DATA(sa, LSM_AUDIT_DATA_CAP, OP_CAPABLE); |
0ed3b28a | 73 | sa.u.cap = cap; |
ef88a7ac | 74 | aad(&sa)->error = error; |
12eb87d5 JJ |
75 | if (audit == SECURITY_CAP_NOAUDIT) |
76 | aad(&sa)->info = "optional: no audit"; | |
0ed3b28a JJ |
77 | |
78 | if (likely(!error)) { | |
79 | /* test if auditing is being forced */ | |
80 | if (likely((AUDIT_MODE(profile) != AUDIT_ALL) && | |
81 | !cap_raised(profile->caps.audit, cap))) | |
82 | return 0; | |
83 | type = AUDIT_APPARMOR_AUDIT; | |
84 | } else if (KILL_MODE(profile) || | |
85 | cap_raised(profile->caps.kill, cap)) { | |
86 | type = AUDIT_APPARMOR_KILL; | |
87 | } else if (cap_raised(profile->caps.quiet, cap) && | |
88 | AUDIT_MODE(profile) != AUDIT_NOQUIET && | |
89 | AUDIT_MODE(profile) != AUDIT_ALL) { | |
90 | /* quiet auditing */ | |
91 | return error; | |
92 | } | |
93 | ||
94 | /* Do simple duplicate message elimination */ | |
95 | ent = &get_cpu_var(audit_cache); | |
96 | if (profile == ent->profile && cap_raised(ent->caps, cap)) { | |
97 | put_cpu_var(audit_cache); | |
98 | if (COMPLAIN_MODE(profile)) | |
99 | return complain_error(error); | |
100 | return error; | |
101 | } else { | |
102 | aa_put_profile(ent->profile); | |
103 | ent->profile = aa_get_profile(profile); | |
104 | cap_raise(ent->caps, cap); | |
105 | } | |
106 | put_cpu_var(audit_cache); | |
107 | ||
ef88a7ac | 108 | return aa_audit(type, profile, &sa, audit_cb); |
0ed3b28a JJ |
109 | } |
110 | ||
111 | /** | |
112 | * profile_capable - test if profile allows use of capability @cap | |
113 | * @profile: profile being enforced (NOT NULL, NOT unconfined) | |
114 | * @cap: capability to test if allowed | |
115 | * | |
116 | * Returns: 0 if allowed else -EPERM | |
117 | */ | |
118 | static int profile_capable(struct aa_profile *profile, int cap) | |
119 | { | |
120 | return cap_raised(profile->caps.allow, cap) ? 0 : -EPERM; | |
121 | } | |
122 | ||
123 | /** | |
124 | * aa_capable - test permission to use capability | |
dd0c6e86 | 125 | * @profile: profile being tested against (NOT NULL) |
0ed3b28a JJ |
126 | * @cap: capability to be tested |
127 | * @audit: whether an audit record should be generated | |
128 | * | |
129 | * Look up capability in profile capability set. | |
130 | * | |
131 | * Returns: 0 on success, or else an error code. | |
132 | */ | |
dd0c6e86 | 133 | int aa_capable(struct aa_profile *profile, int cap, int audit) |
0ed3b28a JJ |
134 | { |
135 | int error = profile_capable(profile, cap); | |
136 | ||
12eb87d5 JJ |
137 | if (audit == SECURITY_CAP_NOAUDIT) { |
138 | if (!COMPLAIN_MODE(profile)) | |
139 | return error; | |
0ed3b28a JJ |
140 | } |
141 | ||
12eb87d5 | 142 | return audit_caps(profile, cap, audit, error); |
0ed3b28a | 143 | } |