1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * AppArmor security module 4 * 5 * This file contains AppArmor auditing functions 6 * 7 * Copyright (C) 1998-2008 Novell/SUSE 8 * Copyright 2009-2010 Canonical Ltd. 9 */ 10 11 #include <linux/audit.h> 12 #include <linux/socket.h> 13 14 #include "include/apparmor.h" 15 #include "include/audit.h" 16 #include "include/policy.h" 17 #include "include/policy_ns.h" 18 #include "include/secid.h" 19 20 const char *const audit_mode_names[] = { 21 "normal", 22 "quiet_denied", 23 "quiet.allowed", 24 "quiet", 25 "noquiet", 26 "all" 27 }; 28 29 static const char *const aa_audit_type[] = { 30 "AUDIT", 31 "ALLOWED", 32 "DENIED", 33 "HINT", 34 "STATUS", 35 "ERROR", 36 "KILLED", 37 "AUTO" 38 }; 39 40 static const char *const aa_class_names[] = { 41 "none", 42 "unknown", 43 "file", 44 "cap", 45 "net", 46 "rlimits", 47 "domain", 48 "mount", 49 "unknown", 50 "ptrace", 51 "signal", 52 "xmatch", 53 "unknown", 54 "unknown", 55 "net", 56 "netv9", 57 "label", 58 "posix_mqueue", 59 "io_uring", 60 "module", 61 "lsm", 62 "namespace", 63 "io_uring", 64 "unknown", 65 "unknown", 66 "unknown", 67 "unknown", 68 "unknown", 69 "unknown", 70 "unknown", 71 "netv9_packet", 72 "X", 73 "dbus", 74 }; 75 76 77 /* 78 * Currently AppArmor auditing is fed straight into the audit framework. 79 * 80 * TODO: 81 * netlink interface for complain mode 82 * user auditing, - send user auditing to netlink interface 83 * system control of whether user audit messages go to system log 84 */ 85 86 /** 87 * audit_pre() - core AppArmor function. 88 * @ab: audit buffer to fill (NOT NULL) 89 * @va: audit structure containing data to audit (NOT NULL) 90 * 91 * Record common AppArmor audit data from @va 92 */ 93 static void audit_pre(struct audit_buffer *ab, void *va) 94 { 95 struct apparmor_audit_data *ad = aad_of_va(va); 96 97 if (aa_g_audit_header) { 98 audit_log_format(ab, "apparmor=\"%s\"", 99 aa_audit_type[ad->type]); 100 } 101 102 if (ad->op) 103 audit_log_format(ab, " operation=\"%s\"", ad->op); 104 105 if (ad->class) 106 audit_log_format(ab, " class=\"%s\"", 107 ad->class <= AA_CLASS_LAST ? 108 aa_class_names[ad->class] : 109 "unknown"); 110 111 if (ad->info) { 112 audit_log_format(ab, " info=\"%s\"", ad->info); 113 if (ad->error) 114 audit_log_format(ab, " error=%d", ad->error); 115 } 116 117 if (ad->subj_label) { 118 struct aa_label *label = ad->subj_label; 119 120 if (label_isprofile(label)) { 121 struct aa_profile *profile = labels_profile(label); 122 123 if (profile->ns != root_ns) { 124 audit_log_format(ab, " namespace="); 125 audit_log_untrustedstring(ab, 126 profile->ns->base.hname); 127 } 128 audit_log_format(ab, " profile="); 129 audit_log_untrustedstring(ab, profile->base.hname); 130 } else { 131 audit_log_format(ab, " label="); 132 aa_label_xaudit(ab, root_ns, label, FLAG_VIEW_SUBNS, 133 GFP_ATOMIC); 134 } 135 } 136 137 if (ad->name) { 138 audit_log_format(ab, " name="); 139 audit_log_untrustedstring(ab, ad->name); 140 } 141 } 142 143 /** 144 * aa_audit_msg - Log a message to the audit subsystem 145 * @type: audit type for the message 146 * @ad: audit event structure (NOT NULL) 147 * @cb: optional callback fn for type specific fields (MAYBE NULL) 148 */ 149 void aa_audit_msg(int type, struct apparmor_audit_data *ad, 150 void (*cb) (struct audit_buffer *, void *)) 151 { 152 ad->type = type; 153 common_lsm_audit(&ad->common, audit_pre, cb); 154 } 155 156 /** 157 * aa_audit - Log a profile based audit event to the audit subsystem 158 * @type: audit type for the message 159 * @profile: profile to check against (NOT NULL) 160 * @ad: audit event (NOT NULL) 161 * @cb: optional callback fn for type specific fields (MAYBE NULL) 162 * 163 * Handle default message switching based off of audit mode flags 164 * 165 * Returns: error on failure 166 */ 167 int aa_audit(int type, struct aa_profile *profile, 168 struct apparmor_audit_data *ad, 169 void (*cb) (struct audit_buffer *, void *)) 170 { 171 AA_BUG(!profile); 172 173 if (type == AUDIT_APPARMOR_AUTO) { 174 if (likely(!ad->error)) { 175 if (AUDIT_MODE(profile) != AUDIT_ALL) 176 return 0; 177 type = AUDIT_APPARMOR_AUDIT; 178 } else if (COMPLAIN_MODE(profile)) 179 type = AUDIT_APPARMOR_ALLOWED; 180 else 181 type = AUDIT_APPARMOR_DENIED; 182 } 183 if (AUDIT_MODE(profile) == AUDIT_QUIET || 184 (type == AUDIT_APPARMOR_DENIED && 185 AUDIT_MODE(profile) == AUDIT_QUIET_DENIED)) 186 return ad->error; 187 188 if (KILL_MODE(profile) && type == AUDIT_APPARMOR_DENIED) 189 type = AUDIT_APPARMOR_KILL; 190 191 ad->subj_label = &profile->label; 192 193 aa_audit_msg(type, ad, cb); 194 195 if (ad->type == AUDIT_APPARMOR_KILL) 196 send_sig_info(profile->signal, SEND_SIG_NOINFO, 197 ad->common.type == LSM_AUDIT_DATA_TASK && 198 ad->common.u.tsk ? ad->common.u.tsk : current); 199 200 if (ad->type == AUDIT_APPARMOR_ALLOWED) 201 return complain_error(ad->error); 202 203 return ad->error; 204 } 205 206 struct aa_audit_rule { 207 struct aa_label *label; 208 }; 209 210 void aa_audit_rule_free(void *vrule) 211 { 212 struct aa_audit_rule *rule = vrule; 213 214 if (rule) { 215 if (!IS_ERR(rule->label)) 216 aa_put_label(rule->label); 217 kfree(rule); 218 } 219 } 220 221 int aa_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule, gfp_t gfp) 222 { 223 struct aa_audit_rule *rule; 224 225 switch (field) { 226 case AUDIT_SUBJ_ROLE: 227 if (op != Audit_equal && op != Audit_not_equal) 228 return -EINVAL; 229 break; 230 default: 231 return -EINVAL; 232 } 233 234 rule = kzalloc_obj(struct aa_audit_rule, gfp); 235 236 if (!rule) 237 return -ENOMEM; 238 239 /* Currently rules are treated as coming from the root ns */ 240 rule->label = aa_label_parse(&root_ns->unconfined->label, rulestr, 241 gfp, true, false); 242 if (IS_ERR(rule->label)) { 243 int err = PTR_ERR(rule->label); 244 aa_audit_rule_free(rule); 245 return err; 246 } 247 248 *vrule = rule; 249 return 0; 250 } 251 252 int aa_audit_rule_known(struct audit_krule *rule) 253 { 254 int i; 255 256 for (i = 0; i < rule->field_count; i++) { 257 struct audit_field *f = &rule->fields[i]; 258 259 switch (f->type) { 260 case AUDIT_SUBJ_ROLE: 261 return 1; 262 } 263 } 264 265 return 0; 266 } 267 268 int aa_audit_rule_match(struct lsm_prop *prop, u32 field, u32 op, void *vrule) 269 { 270 struct aa_audit_rule *rule = vrule; 271 struct aa_label *label; 272 int found = 0; 273 274 label = prop->apparmor.label; 275 276 if (!label) 277 return -ENOENT; 278 279 if (aa_label_is_subset(label, rule->label)) 280 found = 1; 281 282 switch (field) { 283 case AUDIT_SUBJ_ROLE: 284 switch (op) { 285 case Audit_equal: 286 return found; 287 case Audit_not_equal: 288 return !found; 289 } 290 } 291 return 0; 292 } 293