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Linux/security/apparmor/capability.c

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  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>
 18 
 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"
 24 
 25 /*
 26  * Table of capability names: we generate it from capabilities.h.
 27  */
 28 #include "capability_names.h"
 29 
 30 struct aa_fs_entry aa_fs_entry_caps[] = {
 31         AA_FS_FILE_STRING("mask", AA_FS_CAPS_MASK),
 32         { }
 33 };
 34 
 35 struct audit_cache {
 36         struct aa_profile *profile;
 37         kernel_cap_t caps;
 38 };
 39 
 40 static DEFINE_PER_CPU(struct audit_cache, audit_cache);
 41 
 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)
 46  */
 47 static void audit_cb(struct audit_buffer *ab, void *va)
 48 {
 49         struct common_audit_data *sa = va;
 50         audit_log_format(ab, " capname=");
 51         audit_log_untrustedstring(ab, capability_names[sa->u.cap]);
 52 }
 53 
 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
 59  *
 60  * Do auditing of capability and handle, audit/complain/kill modes switching
 61  * and duplicate message elimination.
 62  *
 63  * Returns: 0 or sa->error on success,  error code on failure
 64  */
 65 static int audit_caps(struct aa_profile *profile, int cap, int error)
 66 {
 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;
 76 
 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;
 91         }
 92 
 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);
104         }
105         put_cpu_var(audit_cache);
106 
107         return aa_audit(type, profile, GFP_ATOMIC, &sa, audit_cb);
108 }
109 
110 /**
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
114  *
115  * Returns: 0 if allowed else -EPERM
116  */
117 static int profile_capable(struct aa_profile *profile, int cap)
118 {
119         return cap_raised(profile->caps.allow, cap) ? 0 : -EPERM;
120 }
121 
122 /**
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
127  *
128  * Look up capability in profile capability set.
129  *
130  * Returns: 0 on success, or else an error code.
131  */
132 int aa_capable(struct aa_profile *profile, int cap, int audit)
133 {
134         int error = profile_capable(profile, cap);
135 
136         if (!audit) {
137                 if (COMPLAIN_MODE(profile))
138                         return complain_error(error);
139                 return error;
140         }
141 
142         return audit_caps(profile, cap, error);
143 }
144 

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