powerpc/vphn: move VPHN parsing logic to a separate file
[linux/fpc-iii.git] / security / apparmor / capability.c
blob1101c6f64bb7cb36602957ef2bcbc1538ee8aa63
1 /*
2 * AppArmor security module
4 * This file contains AppArmor capability mediation functions
6 * Copyright (C) 1998-2008 Novell/SUSE
7 * Copyright 2009-2010 Canonical Ltd.
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.
15 #include <linux/capability.h>
16 #include <linux/errno.h>
17 #include <linux/gfp.h>
19 #include "include/apparmor.h"
20 #include "include/capability.h"
21 #include "include/context.h"
22 #include "include/policy.h"
23 #include "include/audit.h"
26 * Table of capability names: we generate it from capabilities.h.
28 #include "capability_names.h"
30 struct aa_fs_entry aa_fs_entry_caps[] = {
31 AA_FS_FILE_STRING("mask", AA_FS_CAPS_MASK),
32 { }
35 struct audit_cache {
36 struct aa_profile *profile;
37 kernel_cap_t caps;
40 static DEFINE_PER_CPU(struct audit_cache, audit_cache);
42 /**
43 * audit_cb - call back for capability components of audit struct
44 * @ab - audit buffer (NOT NULL)
45 * @va - audit struct to audit data from (NOT NULL)
47 static void audit_cb(struct audit_buffer *ab, void *va)
49 struct common_audit_data *sa = va;
50 audit_log_format(ab, " capname=");
51 audit_log_untrustedstring(ab, capability_names[sa->u.cap]);
54 /**
55 * audit_caps - audit a capability
56 * @profile: profile being tested for confinement (NOT NULL)
57 * @cap: capability tested
58 * @error: error code returned by test
60 * Do auditing of capability and handle, audit/complain/kill modes switching
61 * and duplicate message elimination.
63 * Returns: 0 or sa->error on success, error code on failure
65 static int audit_caps(struct aa_profile *profile, int cap, int error)
67 struct audit_cache *ent;
68 int type = AUDIT_APPARMOR_AUTO;
69 struct common_audit_data sa;
70 struct apparmor_audit_data aad = {0,};
71 sa.type = LSM_AUDIT_DATA_CAP;
72 sa.aad = &aad;
73 sa.u.cap = cap;
74 sa.aad->op = OP_CAPABLE;
75 sa.aad->error = error;
77 if (likely(!error)) {
78 /* test if auditing is being forced */
79 if (likely((AUDIT_MODE(profile) != AUDIT_ALL) &&
80 !cap_raised(profile->caps.audit, cap)))
81 return 0;
82 type = AUDIT_APPARMOR_AUDIT;
83 } else if (KILL_MODE(profile) ||
84 cap_raised(profile->caps.kill, cap)) {
85 type = AUDIT_APPARMOR_KILL;
86 } else if (cap_raised(profile->caps.quiet, cap) &&
87 AUDIT_MODE(profile) != AUDIT_NOQUIET &&
88 AUDIT_MODE(profile) != AUDIT_ALL) {
89 /* quiet auditing */
90 return error;
93 /* Do simple duplicate message elimination */
94 ent = &get_cpu_var(audit_cache);
95 if (profile == ent->profile && cap_raised(ent->caps, cap)) {
96 put_cpu_var(audit_cache);
97 if (COMPLAIN_MODE(profile))
98 return complain_error(error);
99 return error;
100 } else {
101 aa_put_profile(ent->profile);
102 ent->profile = aa_get_profile(profile);
103 cap_raise(ent->caps, cap);
105 put_cpu_var(audit_cache);
107 return aa_audit(type, profile, GFP_ATOMIC, &sa, audit_cb);
111 * profile_capable - test if profile allows use of capability @cap
112 * @profile: profile being enforced (NOT NULL, NOT unconfined)
113 * @cap: capability to test if allowed
115 * Returns: 0 if allowed else -EPERM
117 static int profile_capable(struct aa_profile *profile, int cap)
119 return cap_raised(profile->caps.allow, cap) ? 0 : -EPERM;
123 * aa_capable - test permission to use capability
124 * @profile: profile being tested against (NOT NULL)
125 * @cap: capability to be tested
126 * @audit: whether an audit record should be generated
128 * Look up capability in profile capability set.
130 * Returns: 0 on success, or else an error code.
132 int aa_capable(struct aa_profile *profile, int cap, int audit)
134 int error = profile_capable(profile, cap);
136 if (!audit) {
137 if (COMPLAIN_MODE(profile))
138 return complain_error(error);
139 return error;
142 return audit_caps(profile, cap, error);