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
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"
31 struct aa_profile *profile;
35 static DEFINE_PER_CPU(struct audit_cache, audit_cache);
38 * audit_cb - call back for capability components of audit struct
39 * @ab - audit buffer (NOT NULL)
40 * @va - audit struct to audit data from (NOT NULL)
42 static void audit_cb(struct audit_buffer *ab, void *va)
44 struct common_audit_data *sa = va;
45 audit_log_format(ab, " capname=");
46 audit_log_untrustedstring(ab, capability_names[sa->u.cap]);
50 * audit_caps - audit a capability
51 * @profile: profile confining task (NOT NULL)
52 * @task: task capability test was performed against (NOT NULL)
53 * @cap: capability tested
54 * @error: error code returned by test
56 * Do auditing of capability and handle, audit/complain/kill modes switching
57 * and duplicate message elimination.
59 * Returns: 0 or sa->error on success, error code on failure
61 static int audit_caps(struct aa_profile *profile, struct task_struct *task,
64 struct audit_cache *ent;
65 int type = AUDIT_APPARMOR_AUTO;
66 struct common_audit_data sa;
67 COMMON_AUDIT_DATA_INIT(&sa, CAP);
70 sa.aad.op = OP_CAPABLE;
74 /* test if auditing is being forced */
75 if (likely((AUDIT_MODE(profile) != AUDIT_ALL) &&
76 !cap_raised(profile->caps.audit, cap)))
78 type = AUDIT_APPARMOR_AUDIT;
79 } else if (KILL_MODE(profile) ||
80 cap_raised(profile->caps.kill, cap)) {
81 type = AUDIT_APPARMOR_KILL;
82 } else if (cap_raised(profile->caps.quiet, cap) &&
83 AUDIT_MODE(profile) != AUDIT_NOQUIET &&
84 AUDIT_MODE(profile) != AUDIT_ALL) {
89 /* Do simple duplicate message elimination */
90 ent = &get_cpu_var(audit_cache);
91 if (profile == ent->profile && cap_raised(ent->caps, cap)) {
92 put_cpu_var(audit_cache);
93 if (COMPLAIN_MODE(profile))
94 return complain_error(error);
97 aa_put_profile(ent->profile);
98 ent->profile = aa_get_profile(profile);
99 cap_raise(ent->caps, cap);
101 put_cpu_var(audit_cache);
103 return aa_audit(type, profile, GFP_ATOMIC, &sa, audit_cb);
107 * profile_capable - test if profile allows use of capability @cap
108 * @profile: profile being enforced (NOT NULL, NOT unconfined)
109 * @cap: capability to test if allowed
111 * Returns: 0 if allowed else -EPERM
113 static int profile_capable(struct aa_profile *profile, int cap)
115 return cap_raised(profile->caps.allow, cap) ? 0 : -EPERM;
119 * aa_capable - test permission to use capability
120 * @task: task doing capability test against (NOT NULL)
121 * @profile: profile confining @task (NOT NULL)
122 * @cap: capability to be tested
123 * @audit: whether an audit record should be generated
125 * Look up capability in profile capability set.
127 * Returns: 0 on success, or else an error code.
129 int aa_capable(struct task_struct *task, struct aa_profile *profile, int cap,
132 int error = profile_capable(profile, cap);
135 if (COMPLAIN_MODE(profile))
136 return complain_error(error);
140 return audit_caps(profile, task, cap, error);