Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Implementation of the security services. |
| 3 | * |
| 4 | * Authors : Stephen Smalley, <sds@epoch.ncsc.mil> |
| 5 | * James Morris <jmorris@redhat.com> |
| 6 | * |
| 7 | * Updated: Trusted Computer Solutions, Inc. <dgoeddel@trustedcs.com> |
| 8 | * |
| 9 | * Support for enhanced MLS infrastructure. |
| 10 | * |
| 11 | * Updated: Frank Mayer <mayerf@tresys.com> and Karl MacMillan <kmacmillan@tresys.com> |
| 12 | * |
| 13 | * Added conditional policy language extensions |
| 14 | * |
| 15 | * Copyright (C) 2004-2005 Trusted Computer Solutions, Inc. |
| 16 | * Copyright (C) 2003 - 2004 Tresys Technology, LLC |
| 17 | * Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com> |
| 18 | * This program is free software; you can redistribute it and/or modify |
| 19 | * it under the terms of the GNU General Public License as published by |
| 20 | * the Free Software Foundation, version 2. |
| 21 | */ |
| 22 | #include <linux/kernel.h> |
| 23 | #include <linux/slab.h> |
| 24 | #include <linux/string.h> |
| 25 | #include <linux/spinlock.h> |
| 26 | #include <linux/errno.h> |
| 27 | #include <linux/in.h> |
| 28 | #include <linux/sched.h> |
| 29 | #include <linux/audit.h> |
Ingo Molnar | bb003079 | 2006-03-22 00:09:14 -0800 | [diff] [blame] | 30 | #include <linux/mutex.h> |
| 31 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #include "flask.h" |
| 33 | #include "avc.h" |
| 34 | #include "avc_ss.h" |
| 35 | #include "security.h" |
| 36 | #include "context.h" |
| 37 | #include "policydb.h" |
| 38 | #include "sidtab.h" |
| 39 | #include "services.h" |
| 40 | #include "conditional.h" |
| 41 | #include "mls.h" |
| 42 | |
| 43 | extern void selnl_notify_policyload(u32 seqno); |
| 44 | unsigned int policydb_loaded_version; |
| 45 | |
| 46 | static DEFINE_RWLOCK(policy_rwlock); |
| 47 | #define POLICY_RDLOCK read_lock(&policy_rwlock) |
| 48 | #define POLICY_WRLOCK write_lock_irq(&policy_rwlock) |
| 49 | #define POLICY_RDUNLOCK read_unlock(&policy_rwlock) |
| 50 | #define POLICY_WRUNLOCK write_unlock_irq(&policy_rwlock) |
| 51 | |
Ingo Molnar | bb003079 | 2006-03-22 00:09:14 -0800 | [diff] [blame] | 52 | static DEFINE_MUTEX(load_mutex); |
| 53 | #define LOAD_LOCK mutex_lock(&load_mutex) |
| 54 | #define LOAD_UNLOCK mutex_unlock(&load_mutex) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | |
| 56 | static struct sidtab sidtab; |
| 57 | struct policydb policydb; |
| 58 | int ss_initialized = 0; |
| 59 | |
| 60 | /* |
| 61 | * The largest sequence number that has been used when |
| 62 | * providing an access decision to the access vector cache. |
| 63 | * The sequence number only changes when a policy change |
| 64 | * occurs. |
| 65 | */ |
| 66 | static u32 latest_granting = 0; |
| 67 | |
| 68 | /* Forward declaration. */ |
| 69 | static int context_struct_to_string(struct context *context, char **scontext, |
| 70 | u32 *scontext_len); |
| 71 | |
| 72 | /* |
| 73 | * Return the boolean value of a constraint expression |
| 74 | * when it is applied to the specified source and target |
| 75 | * security contexts. |
| 76 | * |
| 77 | * xcontext is a special beast... It is used by the validatetrans rules |
| 78 | * only. For these rules, scontext is the context before the transition, |
| 79 | * tcontext is the context after the transition, and xcontext is the context |
| 80 | * of the process performing the transition. All other callers of |
| 81 | * constraint_expr_eval should pass in NULL for xcontext. |
| 82 | */ |
| 83 | static int constraint_expr_eval(struct context *scontext, |
| 84 | struct context *tcontext, |
| 85 | struct context *xcontext, |
| 86 | struct constraint_expr *cexpr) |
| 87 | { |
| 88 | u32 val1, val2; |
| 89 | struct context *c; |
| 90 | struct role_datum *r1, *r2; |
| 91 | struct mls_level *l1, *l2; |
| 92 | struct constraint_expr *e; |
| 93 | int s[CEXPR_MAXDEPTH]; |
| 94 | int sp = -1; |
| 95 | |
| 96 | for (e = cexpr; e; e = e->next) { |
| 97 | switch (e->expr_type) { |
| 98 | case CEXPR_NOT: |
| 99 | BUG_ON(sp < 0); |
| 100 | s[sp] = !s[sp]; |
| 101 | break; |
| 102 | case CEXPR_AND: |
| 103 | BUG_ON(sp < 1); |
| 104 | sp--; |
| 105 | s[sp] &= s[sp+1]; |
| 106 | break; |
| 107 | case CEXPR_OR: |
| 108 | BUG_ON(sp < 1); |
| 109 | sp--; |
| 110 | s[sp] |= s[sp+1]; |
| 111 | break; |
| 112 | case CEXPR_ATTR: |
| 113 | if (sp == (CEXPR_MAXDEPTH-1)) |
| 114 | return 0; |
| 115 | switch (e->attr) { |
| 116 | case CEXPR_USER: |
| 117 | val1 = scontext->user; |
| 118 | val2 = tcontext->user; |
| 119 | break; |
| 120 | case CEXPR_TYPE: |
| 121 | val1 = scontext->type; |
| 122 | val2 = tcontext->type; |
| 123 | break; |
| 124 | case CEXPR_ROLE: |
| 125 | val1 = scontext->role; |
| 126 | val2 = tcontext->role; |
| 127 | r1 = policydb.role_val_to_struct[val1 - 1]; |
| 128 | r2 = policydb.role_val_to_struct[val2 - 1]; |
| 129 | switch (e->op) { |
| 130 | case CEXPR_DOM: |
| 131 | s[++sp] = ebitmap_get_bit(&r1->dominates, |
| 132 | val2 - 1); |
| 133 | continue; |
| 134 | case CEXPR_DOMBY: |
| 135 | s[++sp] = ebitmap_get_bit(&r2->dominates, |
| 136 | val1 - 1); |
| 137 | continue; |
| 138 | case CEXPR_INCOMP: |
| 139 | s[++sp] = ( !ebitmap_get_bit(&r1->dominates, |
| 140 | val2 - 1) && |
| 141 | !ebitmap_get_bit(&r2->dominates, |
| 142 | val1 - 1) ); |
| 143 | continue; |
| 144 | default: |
| 145 | break; |
| 146 | } |
| 147 | break; |
| 148 | case CEXPR_L1L2: |
| 149 | l1 = &(scontext->range.level[0]); |
| 150 | l2 = &(tcontext->range.level[0]); |
| 151 | goto mls_ops; |
| 152 | case CEXPR_L1H2: |
| 153 | l1 = &(scontext->range.level[0]); |
| 154 | l2 = &(tcontext->range.level[1]); |
| 155 | goto mls_ops; |
| 156 | case CEXPR_H1L2: |
| 157 | l1 = &(scontext->range.level[1]); |
| 158 | l2 = &(tcontext->range.level[0]); |
| 159 | goto mls_ops; |
| 160 | case CEXPR_H1H2: |
| 161 | l1 = &(scontext->range.level[1]); |
| 162 | l2 = &(tcontext->range.level[1]); |
| 163 | goto mls_ops; |
| 164 | case CEXPR_L1H1: |
| 165 | l1 = &(scontext->range.level[0]); |
| 166 | l2 = &(scontext->range.level[1]); |
| 167 | goto mls_ops; |
| 168 | case CEXPR_L2H2: |
| 169 | l1 = &(tcontext->range.level[0]); |
| 170 | l2 = &(tcontext->range.level[1]); |
| 171 | goto mls_ops; |
| 172 | mls_ops: |
| 173 | switch (e->op) { |
| 174 | case CEXPR_EQ: |
| 175 | s[++sp] = mls_level_eq(l1, l2); |
| 176 | continue; |
| 177 | case CEXPR_NEQ: |
| 178 | s[++sp] = !mls_level_eq(l1, l2); |
| 179 | continue; |
| 180 | case CEXPR_DOM: |
| 181 | s[++sp] = mls_level_dom(l1, l2); |
| 182 | continue; |
| 183 | case CEXPR_DOMBY: |
| 184 | s[++sp] = mls_level_dom(l2, l1); |
| 185 | continue; |
| 186 | case CEXPR_INCOMP: |
| 187 | s[++sp] = mls_level_incomp(l2, l1); |
| 188 | continue; |
| 189 | default: |
| 190 | BUG(); |
| 191 | return 0; |
| 192 | } |
| 193 | break; |
| 194 | default: |
| 195 | BUG(); |
| 196 | return 0; |
| 197 | } |
| 198 | |
| 199 | switch (e->op) { |
| 200 | case CEXPR_EQ: |
| 201 | s[++sp] = (val1 == val2); |
| 202 | break; |
| 203 | case CEXPR_NEQ: |
| 204 | s[++sp] = (val1 != val2); |
| 205 | break; |
| 206 | default: |
| 207 | BUG(); |
| 208 | return 0; |
| 209 | } |
| 210 | break; |
| 211 | case CEXPR_NAMES: |
| 212 | if (sp == (CEXPR_MAXDEPTH-1)) |
| 213 | return 0; |
| 214 | c = scontext; |
| 215 | if (e->attr & CEXPR_TARGET) |
| 216 | c = tcontext; |
| 217 | else if (e->attr & CEXPR_XTARGET) { |
| 218 | c = xcontext; |
| 219 | if (!c) { |
| 220 | BUG(); |
| 221 | return 0; |
| 222 | } |
| 223 | } |
| 224 | if (e->attr & CEXPR_USER) |
| 225 | val1 = c->user; |
| 226 | else if (e->attr & CEXPR_ROLE) |
| 227 | val1 = c->role; |
| 228 | else if (e->attr & CEXPR_TYPE) |
| 229 | val1 = c->type; |
| 230 | else { |
| 231 | BUG(); |
| 232 | return 0; |
| 233 | } |
| 234 | |
| 235 | switch (e->op) { |
| 236 | case CEXPR_EQ: |
| 237 | s[++sp] = ebitmap_get_bit(&e->names, val1 - 1); |
| 238 | break; |
| 239 | case CEXPR_NEQ: |
| 240 | s[++sp] = !ebitmap_get_bit(&e->names, val1 - 1); |
| 241 | break; |
| 242 | default: |
| 243 | BUG(); |
| 244 | return 0; |
| 245 | } |
| 246 | break; |
| 247 | default: |
| 248 | BUG(); |
| 249 | return 0; |
| 250 | } |
| 251 | } |
| 252 | |
| 253 | BUG_ON(sp != 0); |
| 254 | return s[0]; |
| 255 | } |
| 256 | |
| 257 | /* |
| 258 | * Compute access vectors based on a context structure pair for |
| 259 | * the permissions in a particular class. |
| 260 | */ |
| 261 | static int context_struct_compute_av(struct context *scontext, |
| 262 | struct context *tcontext, |
| 263 | u16 tclass, |
| 264 | u32 requested, |
| 265 | struct av_decision *avd) |
| 266 | { |
| 267 | struct constraint_node *constraint; |
| 268 | struct role_allow *ra; |
| 269 | struct avtab_key avkey; |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 270 | struct avtab_node *node; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | struct class_datum *tclass_datum; |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 272 | struct ebitmap *sattr, *tattr; |
| 273 | struct ebitmap_node *snode, *tnode; |
| 274 | unsigned int i, j; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | |
| 276 | /* |
| 277 | * Remap extended Netlink classes for old policy versions. |
| 278 | * Do this here rather than socket_type_to_security_class() |
| 279 | * in case a newer policy version is loaded, allowing sockets |
| 280 | * to remain in the correct class. |
| 281 | */ |
| 282 | if (policydb_loaded_version < POLICYDB_VERSION_NLCLASS) |
| 283 | if (tclass >= SECCLASS_NETLINK_ROUTE_SOCKET && |
| 284 | tclass <= SECCLASS_NETLINK_DNRT_SOCKET) |
| 285 | tclass = SECCLASS_NETLINK_SOCKET; |
| 286 | |
| 287 | if (!tclass || tclass > policydb.p_classes.nprim) { |
| 288 | printk(KERN_ERR "security_compute_av: unrecognized class %d\n", |
| 289 | tclass); |
| 290 | return -EINVAL; |
| 291 | } |
| 292 | tclass_datum = policydb.class_val_to_struct[tclass - 1]; |
| 293 | |
| 294 | /* |
| 295 | * Initialize the access vectors to the default values. |
| 296 | */ |
| 297 | avd->allowed = 0; |
| 298 | avd->decided = 0xffffffff; |
| 299 | avd->auditallow = 0; |
| 300 | avd->auditdeny = 0xffffffff; |
| 301 | avd->seqno = latest_granting; |
| 302 | |
| 303 | /* |
| 304 | * If a specific type enforcement rule was defined for |
| 305 | * this permission check, then use it. |
| 306 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | avkey.target_class = tclass; |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 308 | avkey.specified = AVTAB_AV; |
| 309 | sattr = &policydb.type_attr_map[scontext->type - 1]; |
| 310 | tattr = &policydb.type_attr_map[tcontext->type - 1]; |
| 311 | ebitmap_for_each_bit(sattr, snode, i) { |
| 312 | if (!ebitmap_node_get_bit(snode, i)) |
| 313 | continue; |
| 314 | ebitmap_for_each_bit(tattr, tnode, j) { |
| 315 | if (!ebitmap_node_get_bit(tnode, j)) |
| 316 | continue; |
| 317 | avkey.source_type = i + 1; |
| 318 | avkey.target_type = j + 1; |
| 319 | for (node = avtab_search_node(&policydb.te_avtab, &avkey); |
| 320 | node != NULL; |
| 321 | node = avtab_search_node_next(node, avkey.specified)) { |
| 322 | if (node->key.specified == AVTAB_ALLOWED) |
| 323 | avd->allowed |= node->datum.data; |
| 324 | else if (node->key.specified == AVTAB_AUDITALLOW) |
| 325 | avd->auditallow |= node->datum.data; |
| 326 | else if (node->key.specified == AVTAB_AUDITDENY) |
| 327 | avd->auditdeny &= node->datum.data; |
| 328 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 330 | /* Check conditional av table for additional permissions */ |
| 331 | cond_compute_av(&policydb.te_cond_avtab, &avkey, avd); |
| 332 | |
| 333 | } |
| 334 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | |
| 336 | /* |
| 337 | * Remove any permissions prohibited by a constraint (this includes |
| 338 | * the MLS policy). |
| 339 | */ |
| 340 | constraint = tclass_datum->constraints; |
| 341 | while (constraint) { |
| 342 | if ((constraint->permissions & (avd->allowed)) && |
| 343 | !constraint_expr_eval(scontext, tcontext, NULL, |
| 344 | constraint->expr)) { |
| 345 | avd->allowed = (avd->allowed) & ~(constraint->permissions); |
| 346 | } |
| 347 | constraint = constraint->next; |
| 348 | } |
| 349 | |
| 350 | /* |
| 351 | * If checking process transition permission and the |
| 352 | * role is changing, then check the (current_role, new_role) |
| 353 | * pair. |
| 354 | */ |
| 355 | if (tclass == SECCLASS_PROCESS && |
| 356 | (avd->allowed & (PROCESS__TRANSITION | PROCESS__DYNTRANSITION)) && |
| 357 | scontext->role != tcontext->role) { |
| 358 | for (ra = policydb.role_allow; ra; ra = ra->next) { |
| 359 | if (scontext->role == ra->role && |
| 360 | tcontext->role == ra->new_role) |
| 361 | break; |
| 362 | } |
| 363 | if (!ra) |
| 364 | avd->allowed = (avd->allowed) & ~(PROCESS__TRANSITION | |
| 365 | PROCESS__DYNTRANSITION); |
| 366 | } |
| 367 | |
| 368 | return 0; |
| 369 | } |
| 370 | |
| 371 | static int security_validtrans_handle_fail(struct context *ocontext, |
| 372 | struct context *ncontext, |
| 373 | struct context *tcontext, |
| 374 | u16 tclass) |
| 375 | { |
| 376 | char *o = NULL, *n = NULL, *t = NULL; |
| 377 | u32 olen, nlen, tlen; |
| 378 | |
| 379 | if (context_struct_to_string(ocontext, &o, &olen) < 0) |
| 380 | goto out; |
| 381 | if (context_struct_to_string(ncontext, &n, &nlen) < 0) |
| 382 | goto out; |
| 383 | if (context_struct_to_string(tcontext, &t, &tlen) < 0) |
| 384 | goto out; |
David Woodhouse | 9ad9ad3 | 2005-06-22 15:04:33 +0100 | [diff] [blame] | 385 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | "security_validate_transition: denied for" |
| 387 | " oldcontext=%s newcontext=%s taskcontext=%s tclass=%s", |
| 388 | o, n, t, policydb.p_class_val_to_name[tclass-1]); |
| 389 | out: |
| 390 | kfree(o); |
| 391 | kfree(n); |
| 392 | kfree(t); |
| 393 | |
| 394 | if (!selinux_enforcing) |
| 395 | return 0; |
| 396 | return -EPERM; |
| 397 | } |
| 398 | |
| 399 | int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid, |
| 400 | u16 tclass) |
| 401 | { |
| 402 | struct context *ocontext; |
| 403 | struct context *ncontext; |
| 404 | struct context *tcontext; |
| 405 | struct class_datum *tclass_datum; |
| 406 | struct constraint_node *constraint; |
| 407 | int rc = 0; |
| 408 | |
| 409 | if (!ss_initialized) |
| 410 | return 0; |
| 411 | |
| 412 | POLICY_RDLOCK; |
| 413 | |
| 414 | /* |
| 415 | * Remap extended Netlink classes for old policy versions. |
| 416 | * Do this here rather than socket_type_to_security_class() |
| 417 | * in case a newer policy version is loaded, allowing sockets |
| 418 | * to remain in the correct class. |
| 419 | */ |
| 420 | if (policydb_loaded_version < POLICYDB_VERSION_NLCLASS) |
| 421 | if (tclass >= SECCLASS_NETLINK_ROUTE_SOCKET && |
| 422 | tclass <= SECCLASS_NETLINK_DNRT_SOCKET) |
| 423 | tclass = SECCLASS_NETLINK_SOCKET; |
| 424 | |
| 425 | if (!tclass || tclass > policydb.p_classes.nprim) { |
| 426 | printk(KERN_ERR "security_validate_transition: " |
| 427 | "unrecognized class %d\n", tclass); |
| 428 | rc = -EINVAL; |
| 429 | goto out; |
| 430 | } |
| 431 | tclass_datum = policydb.class_val_to_struct[tclass - 1]; |
| 432 | |
| 433 | ocontext = sidtab_search(&sidtab, oldsid); |
| 434 | if (!ocontext) { |
| 435 | printk(KERN_ERR "security_validate_transition: " |
| 436 | " unrecognized SID %d\n", oldsid); |
| 437 | rc = -EINVAL; |
| 438 | goto out; |
| 439 | } |
| 440 | |
| 441 | ncontext = sidtab_search(&sidtab, newsid); |
| 442 | if (!ncontext) { |
| 443 | printk(KERN_ERR "security_validate_transition: " |
| 444 | " unrecognized SID %d\n", newsid); |
| 445 | rc = -EINVAL; |
| 446 | goto out; |
| 447 | } |
| 448 | |
| 449 | tcontext = sidtab_search(&sidtab, tasksid); |
| 450 | if (!tcontext) { |
| 451 | printk(KERN_ERR "security_validate_transition: " |
| 452 | " unrecognized SID %d\n", tasksid); |
| 453 | rc = -EINVAL; |
| 454 | goto out; |
| 455 | } |
| 456 | |
| 457 | constraint = tclass_datum->validatetrans; |
| 458 | while (constraint) { |
| 459 | if (!constraint_expr_eval(ocontext, ncontext, tcontext, |
| 460 | constraint->expr)) { |
| 461 | rc = security_validtrans_handle_fail(ocontext, ncontext, |
| 462 | tcontext, tclass); |
| 463 | goto out; |
| 464 | } |
| 465 | constraint = constraint->next; |
| 466 | } |
| 467 | |
| 468 | out: |
| 469 | POLICY_RDUNLOCK; |
| 470 | return rc; |
| 471 | } |
| 472 | |
| 473 | /** |
| 474 | * security_compute_av - Compute access vector decisions. |
| 475 | * @ssid: source security identifier |
| 476 | * @tsid: target security identifier |
| 477 | * @tclass: target security class |
| 478 | * @requested: requested permissions |
| 479 | * @avd: access vector decisions |
| 480 | * |
| 481 | * Compute a set of access vector decisions based on the |
| 482 | * SID pair (@ssid, @tsid) for the permissions in @tclass. |
| 483 | * Return -%EINVAL if any of the parameters are invalid or %0 |
| 484 | * if the access vector decisions were computed successfully. |
| 485 | */ |
| 486 | int security_compute_av(u32 ssid, |
| 487 | u32 tsid, |
| 488 | u16 tclass, |
| 489 | u32 requested, |
| 490 | struct av_decision *avd) |
| 491 | { |
| 492 | struct context *scontext = NULL, *tcontext = NULL; |
| 493 | int rc = 0; |
| 494 | |
| 495 | if (!ss_initialized) { |
Stephen Smalley | 4c443d1 | 2005-05-16 21:53:52 -0700 | [diff] [blame] | 496 | avd->allowed = 0xffffffff; |
| 497 | avd->decided = 0xffffffff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | avd->auditallow = 0; |
| 499 | avd->auditdeny = 0xffffffff; |
| 500 | avd->seqno = latest_granting; |
| 501 | return 0; |
| 502 | } |
| 503 | |
| 504 | POLICY_RDLOCK; |
| 505 | |
| 506 | scontext = sidtab_search(&sidtab, ssid); |
| 507 | if (!scontext) { |
| 508 | printk(KERN_ERR "security_compute_av: unrecognized SID %d\n", |
| 509 | ssid); |
| 510 | rc = -EINVAL; |
| 511 | goto out; |
| 512 | } |
| 513 | tcontext = sidtab_search(&sidtab, tsid); |
| 514 | if (!tcontext) { |
| 515 | printk(KERN_ERR "security_compute_av: unrecognized SID %d\n", |
| 516 | tsid); |
| 517 | rc = -EINVAL; |
| 518 | goto out; |
| 519 | } |
| 520 | |
| 521 | rc = context_struct_compute_av(scontext, tcontext, tclass, |
| 522 | requested, avd); |
| 523 | out: |
| 524 | POLICY_RDUNLOCK; |
| 525 | return rc; |
| 526 | } |
| 527 | |
| 528 | /* |
| 529 | * Write the security context string representation of |
| 530 | * the context structure `context' into a dynamically |
| 531 | * allocated string of the correct size. Set `*scontext' |
| 532 | * to point to this string and set `*scontext_len' to |
| 533 | * the length of the string. |
| 534 | */ |
| 535 | static int context_struct_to_string(struct context *context, char **scontext, u32 *scontext_len) |
| 536 | { |
| 537 | char *scontextp; |
| 538 | |
| 539 | *scontext = NULL; |
| 540 | *scontext_len = 0; |
| 541 | |
| 542 | /* Compute the size of the context. */ |
| 543 | *scontext_len += strlen(policydb.p_user_val_to_name[context->user - 1]) + 1; |
| 544 | *scontext_len += strlen(policydb.p_role_val_to_name[context->role - 1]) + 1; |
| 545 | *scontext_len += strlen(policydb.p_type_val_to_name[context->type - 1]) + 1; |
| 546 | *scontext_len += mls_compute_context_len(context); |
| 547 | |
| 548 | /* Allocate space for the context; caller must free this space. */ |
| 549 | scontextp = kmalloc(*scontext_len, GFP_ATOMIC); |
| 550 | if (!scontextp) { |
| 551 | return -ENOMEM; |
| 552 | } |
| 553 | *scontext = scontextp; |
| 554 | |
| 555 | /* |
| 556 | * Copy the user name, role name and type name into the context. |
| 557 | */ |
| 558 | sprintf(scontextp, "%s:%s:%s", |
| 559 | policydb.p_user_val_to_name[context->user - 1], |
| 560 | policydb.p_role_val_to_name[context->role - 1], |
| 561 | policydb.p_type_val_to_name[context->type - 1]); |
| 562 | scontextp += strlen(policydb.p_user_val_to_name[context->user - 1]) + |
| 563 | 1 + strlen(policydb.p_role_val_to_name[context->role - 1]) + |
| 564 | 1 + strlen(policydb.p_type_val_to_name[context->type - 1]); |
| 565 | |
| 566 | mls_sid_to_context(context, &scontextp); |
| 567 | |
| 568 | *scontextp = 0; |
| 569 | |
| 570 | return 0; |
| 571 | } |
| 572 | |
| 573 | #include "initial_sid_to_string.h" |
| 574 | |
| 575 | /** |
| 576 | * security_sid_to_context - Obtain a context for a given SID. |
| 577 | * @sid: security identifier, SID |
| 578 | * @scontext: security context |
| 579 | * @scontext_len: length in bytes |
| 580 | * |
| 581 | * Write the string representation of the context associated with @sid |
| 582 | * into a dynamically allocated string of the correct size. Set @scontext |
| 583 | * to point to this string and set @scontext_len to the length of the string. |
| 584 | */ |
| 585 | int security_sid_to_context(u32 sid, char **scontext, u32 *scontext_len) |
| 586 | { |
| 587 | struct context *context; |
| 588 | int rc = 0; |
| 589 | |
| 590 | if (!ss_initialized) { |
| 591 | if (sid <= SECINITSID_NUM) { |
| 592 | char *scontextp; |
| 593 | |
| 594 | *scontext_len = strlen(initial_sid_to_string[sid]) + 1; |
| 595 | scontextp = kmalloc(*scontext_len,GFP_ATOMIC); |
| 596 | strcpy(scontextp, initial_sid_to_string[sid]); |
| 597 | *scontext = scontextp; |
| 598 | goto out; |
| 599 | } |
| 600 | printk(KERN_ERR "security_sid_to_context: called before initial " |
| 601 | "load_policy on unknown SID %d\n", sid); |
| 602 | rc = -EINVAL; |
| 603 | goto out; |
| 604 | } |
| 605 | POLICY_RDLOCK; |
| 606 | context = sidtab_search(&sidtab, sid); |
| 607 | if (!context) { |
| 608 | printk(KERN_ERR "security_sid_to_context: unrecognized SID " |
| 609 | "%d\n", sid); |
| 610 | rc = -EINVAL; |
| 611 | goto out_unlock; |
| 612 | } |
| 613 | rc = context_struct_to_string(context, scontext, scontext_len); |
| 614 | out_unlock: |
| 615 | POLICY_RDUNLOCK; |
| 616 | out: |
| 617 | return rc; |
| 618 | |
| 619 | } |
| 620 | |
James Morris | f5c1d5b | 2005-07-28 01:07:37 -0700 | [diff] [blame] | 621 | static int security_context_to_sid_core(char *scontext, u32 scontext_len, u32 *sid, u32 def_sid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | { |
| 623 | char *scontext2; |
| 624 | struct context context; |
| 625 | struct role_datum *role; |
| 626 | struct type_datum *typdatum; |
| 627 | struct user_datum *usrdatum; |
| 628 | char *scontextp, *p, oldc; |
| 629 | int rc = 0; |
| 630 | |
| 631 | if (!ss_initialized) { |
| 632 | int i; |
| 633 | |
| 634 | for (i = 1; i < SECINITSID_NUM; i++) { |
| 635 | if (!strcmp(initial_sid_to_string[i], scontext)) { |
| 636 | *sid = i; |
| 637 | goto out; |
| 638 | } |
| 639 | } |
| 640 | *sid = SECINITSID_KERNEL; |
| 641 | goto out; |
| 642 | } |
| 643 | *sid = SECSID_NULL; |
| 644 | |
| 645 | /* Copy the string so that we can modify the copy as we parse it. |
| 646 | The string should already by null terminated, but we append a |
| 647 | null suffix to the copy to avoid problems with the existing |
| 648 | attr package, which doesn't view the null terminator as part |
| 649 | of the attribute value. */ |
| 650 | scontext2 = kmalloc(scontext_len+1,GFP_KERNEL); |
| 651 | if (!scontext2) { |
| 652 | rc = -ENOMEM; |
| 653 | goto out; |
| 654 | } |
| 655 | memcpy(scontext2, scontext, scontext_len); |
| 656 | scontext2[scontext_len] = 0; |
| 657 | |
| 658 | context_init(&context); |
| 659 | *sid = SECSID_NULL; |
| 660 | |
| 661 | POLICY_RDLOCK; |
| 662 | |
| 663 | /* Parse the security context. */ |
| 664 | |
| 665 | rc = -EINVAL; |
| 666 | scontextp = (char *) scontext2; |
| 667 | |
| 668 | /* Extract the user. */ |
| 669 | p = scontextp; |
| 670 | while (*p && *p != ':') |
| 671 | p++; |
| 672 | |
| 673 | if (*p == 0) |
| 674 | goto out_unlock; |
| 675 | |
| 676 | *p++ = 0; |
| 677 | |
| 678 | usrdatum = hashtab_search(policydb.p_users.table, scontextp); |
| 679 | if (!usrdatum) |
| 680 | goto out_unlock; |
| 681 | |
| 682 | context.user = usrdatum->value; |
| 683 | |
| 684 | /* Extract role. */ |
| 685 | scontextp = p; |
| 686 | while (*p && *p != ':') |
| 687 | p++; |
| 688 | |
| 689 | if (*p == 0) |
| 690 | goto out_unlock; |
| 691 | |
| 692 | *p++ = 0; |
| 693 | |
| 694 | role = hashtab_search(policydb.p_roles.table, scontextp); |
| 695 | if (!role) |
| 696 | goto out_unlock; |
| 697 | context.role = role->value; |
| 698 | |
| 699 | /* Extract type. */ |
| 700 | scontextp = p; |
| 701 | while (*p && *p != ':') |
| 702 | p++; |
| 703 | oldc = *p; |
| 704 | *p++ = 0; |
| 705 | |
| 706 | typdatum = hashtab_search(policydb.p_types.table, scontextp); |
| 707 | if (!typdatum) |
| 708 | goto out_unlock; |
| 709 | |
| 710 | context.type = typdatum->value; |
| 711 | |
James Morris | f5c1d5b | 2005-07-28 01:07:37 -0700 | [diff] [blame] | 712 | rc = mls_context_to_sid(oldc, &p, &context, &sidtab, def_sid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | if (rc) |
| 714 | goto out_unlock; |
| 715 | |
| 716 | if ((p - scontext2) < scontext_len) { |
| 717 | rc = -EINVAL; |
| 718 | goto out_unlock; |
| 719 | } |
| 720 | |
| 721 | /* Check the validity of the new context. */ |
| 722 | if (!policydb_context_isvalid(&policydb, &context)) { |
| 723 | rc = -EINVAL; |
| 724 | goto out_unlock; |
| 725 | } |
| 726 | /* Obtain the new sid. */ |
| 727 | rc = sidtab_context_to_sid(&sidtab, &context, sid); |
| 728 | out_unlock: |
| 729 | POLICY_RDUNLOCK; |
| 730 | context_destroy(&context); |
| 731 | kfree(scontext2); |
| 732 | out: |
| 733 | return rc; |
| 734 | } |
| 735 | |
James Morris | f5c1d5b | 2005-07-28 01:07:37 -0700 | [diff] [blame] | 736 | /** |
| 737 | * security_context_to_sid - Obtain a SID for a given security context. |
| 738 | * @scontext: security context |
| 739 | * @scontext_len: length in bytes |
| 740 | * @sid: security identifier, SID |
| 741 | * |
| 742 | * Obtains a SID associated with the security context that |
| 743 | * has the string representation specified by @scontext. |
| 744 | * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient |
| 745 | * memory is available, or 0 on success. |
| 746 | */ |
| 747 | int security_context_to_sid(char *scontext, u32 scontext_len, u32 *sid) |
| 748 | { |
| 749 | return security_context_to_sid_core(scontext, scontext_len, |
| 750 | sid, SECSID_NULL); |
| 751 | } |
| 752 | |
| 753 | /** |
| 754 | * security_context_to_sid_default - Obtain a SID for a given security context, |
| 755 | * falling back to specified default if needed. |
| 756 | * |
| 757 | * @scontext: security context |
| 758 | * @scontext_len: length in bytes |
| 759 | * @sid: security identifier, SID |
| 760 | * @def_sid: default SID to assign on errror |
| 761 | * |
| 762 | * Obtains a SID associated with the security context that |
| 763 | * has the string representation specified by @scontext. |
| 764 | * The default SID is passed to the MLS layer to be used to allow |
| 765 | * kernel labeling of the MLS field if the MLS field is not present |
| 766 | * (for upgrading to MLS without full relabel). |
| 767 | * Returns -%EINVAL if the context is invalid, -%ENOMEM if insufficient |
| 768 | * memory is available, or 0 on success. |
| 769 | */ |
| 770 | int security_context_to_sid_default(char *scontext, u32 scontext_len, u32 *sid, u32 def_sid) |
| 771 | { |
| 772 | return security_context_to_sid_core(scontext, scontext_len, |
| 773 | sid, def_sid); |
| 774 | } |
| 775 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | static int compute_sid_handle_invalid_context( |
| 777 | struct context *scontext, |
| 778 | struct context *tcontext, |
| 779 | u16 tclass, |
| 780 | struct context *newcontext) |
| 781 | { |
| 782 | char *s = NULL, *t = NULL, *n = NULL; |
| 783 | u32 slen, tlen, nlen; |
| 784 | |
| 785 | if (context_struct_to_string(scontext, &s, &slen) < 0) |
| 786 | goto out; |
| 787 | if (context_struct_to_string(tcontext, &t, &tlen) < 0) |
| 788 | goto out; |
| 789 | if (context_struct_to_string(newcontext, &n, &nlen) < 0) |
| 790 | goto out; |
David Woodhouse | 9ad9ad3 | 2005-06-22 15:04:33 +0100 | [diff] [blame] | 791 | audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | "security_compute_sid: invalid context %s" |
| 793 | " for scontext=%s" |
| 794 | " tcontext=%s" |
| 795 | " tclass=%s", |
| 796 | n, s, t, policydb.p_class_val_to_name[tclass-1]); |
| 797 | out: |
| 798 | kfree(s); |
| 799 | kfree(t); |
| 800 | kfree(n); |
| 801 | if (!selinux_enforcing) |
| 802 | return 0; |
| 803 | return -EACCES; |
| 804 | } |
| 805 | |
| 806 | static int security_compute_sid(u32 ssid, |
| 807 | u32 tsid, |
| 808 | u16 tclass, |
| 809 | u32 specified, |
| 810 | u32 *out_sid) |
| 811 | { |
| 812 | struct context *scontext = NULL, *tcontext = NULL, newcontext; |
| 813 | struct role_trans *roletr = NULL; |
| 814 | struct avtab_key avkey; |
| 815 | struct avtab_datum *avdatum; |
| 816 | struct avtab_node *node; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 817 | int rc = 0; |
| 818 | |
| 819 | if (!ss_initialized) { |
| 820 | switch (tclass) { |
| 821 | case SECCLASS_PROCESS: |
| 822 | *out_sid = ssid; |
| 823 | break; |
| 824 | default: |
| 825 | *out_sid = tsid; |
| 826 | break; |
| 827 | } |
| 828 | goto out; |
| 829 | } |
| 830 | |
| 831 | POLICY_RDLOCK; |
| 832 | |
| 833 | scontext = sidtab_search(&sidtab, ssid); |
| 834 | if (!scontext) { |
| 835 | printk(KERN_ERR "security_compute_sid: unrecognized SID %d\n", |
| 836 | ssid); |
| 837 | rc = -EINVAL; |
| 838 | goto out_unlock; |
| 839 | } |
| 840 | tcontext = sidtab_search(&sidtab, tsid); |
| 841 | if (!tcontext) { |
| 842 | printk(KERN_ERR "security_compute_sid: unrecognized SID %d\n", |
| 843 | tsid); |
| 844 | rc = -EINVAL; |
| 845 | goto out_unlock; |
| 846 | } |
| 847 | |
| 848 | context_init(&newcontext); |
| 849 | |
| 850 | /* Set the user identity. */ |
| 851 | switch (specified) { |
| 852 | case AVTAB_TRANSITION: |
| 853 | case AVTAB_CHANGE: |
| 854 | /* Use the process user identity. */ |
| 855 | newcontext.user = scontext->user; |
| 856 | break; |
| 857 | case AVTAB_MEMBER: |
| 858 | /* Use the related object owner. */ |
| 859 | newcontext.user = tcontext->user; |
| 860 | break; |
| 861 | } |
| 862 | |
| 863 | /* Set the role and type to default values. */ |
| 864 | switch (tclass) { |
| 865 | case SECCLASS_PROCESS: |
| 866 | /* Use the current role and type of process. */ |
| 867 | newcontext.role = scontext->role; |
| 868 | newcontext.type = scontext->type; |
| 869 | break; |
| 870 | default: |
| 871 | /* Use the well-defined object role. */ |
| 872 | newcontext.role = OBJECT_R_VAL; |
| 873 | /* Use the type of the related object. */ |
| 874 | newcontext.type = tcontext->type; |
| 875 | } |
| 876 | |
| 877 | /* Look for a type transition/member/change rule. */ |
| 878 | avkey.source_type = scontext->type; |
| 879 | avkey.target_type = tcontext->type; |
| 880 | avkey.target_class = tclass; |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 881 | avkey.specified = specified; |
| 882 | avdatum = avtab_search(&policydb.te_avtab, &avkey); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 883 | |
| 884 | /* If no permanent rule, also check for enabled conditional rules */ |
| 885 | if(!avdatum) { |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 886 | node = avtab_search_node(&policydb.te_cond_avtab, &avkey); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | for (; node != NULL; node = avtab_search_node_next(node, specified)) { |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 888 | if (node->key.specified & AVTAB_ENABLED) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 889 | avdatum = &node->datum; |
| 890 | break; |
| 891 | } |
| 892 | } |
| 893 | } |
| 894 | |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 895 | if (avdatum) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | /* Use the type from the type transition/member/change rule. */ |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 897 | newcontext.type = avdatum->data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 898 | } |
| 899 | |
| 900 | /* Check for class-specific changes. */ |
| 901 | switch (tclass) { |
| 902 | case SECCLASS_PROCESS: |
| 903 | if (specified & AVTAB_TRANSITION) { |
| 904 | /* Look for a role transition rule. */ |
| 905 | for (roletr = policydb.role_tr; roletr; |
| 906 | roletr = roletr->next) { |
| 907 | if (roletr->role == scontext->role && |
| 908 | roletr->type == tcontext->type) { |
| 909 | /* Use the role transition rule. */ |
| 910 | newcontext.role = roletr->new_role; |
| 911 | break; |
| 912 | } |
| 913 | } |
| 914 | } |
| 915 | break; |
| 916 | default: |
| 917 | break; |
| 918 | } |
| 919 | |
| 920 | /* Set the MLS attributes. |
| 921 | This is done last because it may allocate memory. */ |
| 922 | rc = mls_compute_sid(scontext, tcontext, tclass, specified, &newcontext); |
| 923 | if (rc) |
| 924 | goto out_unlock; |
| 925 | |
| 926 | /* Check the validity of the context. */ |
| 927 | if (!policydb_context_isvalid(&policydb, &newcontext)) { |
| 928 | rc = compute_sid_handle_invalid_context(scontext, |
| 929 | tcontext, |
| 930 | tclass, |
| 931 | &newcontext); |
| 932 | if (rc) |
| 933 | goto out_unlock; |
| 934 | } |
| 935 | /* Obtain the sid for the context. */ |
| 936 | rc = sidtab_context_to_sid(&sidtab, &newcontext, out_sid); |
| 937 | out_unlock: |
| 938 | POLICY_RDUNLOCK; |
| 939 | context_destroy(&newcontext); |
| 940 | out: |
| 941 | return rc; |
| 942 | } |
| 943 | |
| 944 | /** |
| 945 | * security_transition_sid - Compute the SID for a new subject/object. |
| 946 | * @ssid: source security identifier |
| 947 | * @tsid: target security identifier |
| 948 | * @tclass: target security class |
| 949 | * @out_sid: security identifier for new subject/object |
| 950 | * |
| 951 | * Compute a SID to use for labeling a new subject or object in the |
| 952 | * class @tclass based on a SID pair (@ssid, @tsid). |
| 953 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM |
| 954 | * if insufficient memory is available, or %0 if the new SID was |
| 955 | * computed successfully. |
| 956 | */ |
| 957 | int security_transition_sid(u32 ssid, |
| 958 | u32 tsid, |
| 959 | u16 tclass, |
| 960 | u32 *out_sid) |
| 961 | { |
| 962 | return security_compute_sid(ssid, tsid, tclass, AVTAB_TRANSITION, out_sid); |
| 963 | } |
| 964 | |
| 965 | /** |
| 966 | * security_member_sid - Compute the SID for member selection. |
| 967 | * @ssid: source security identifier |
| 968 | * @tsid: target security identifier |
| 969 | * @tclass: target security class |
| 970 | * @out_sid: security identifier for selected member |
| 971 | * |
| 972 | * Compute a SID to use when selecting a member of a polyinstantiated |
| 973 | * object of class @tclass based on a SID pair (@ssid, @tsid). |
| 974 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM |
| 975 | * if insufficient memory is available, or %0 if the SID was |
| 976 | * computed successfully. |
| 977 | */ |
| 978 | int security_member_sid(u32 ssid, |
| 979 | u32 tsid, |
| 980 | u16 tclass, |
| 981 | u32 *out_sid) |
| 982 | { |
| 983 | return security_compute_sid(ssid, tsid, tclass, AVTAB_MEMBER, out_sid); |
| 984 | } |
| 985 | |
| 986 | /** |
| 987 | * security_change_sid - Compute the SID for object relabeling. |
| 988 | * @ssid: source security identifier |
| 989 | * @tsid: target security identifier |
| 990 | * @tclass: target security class |
| 991 | * @out_sid: security identifier for selected member |
| 992 | * |
| 993 | * Compute a SID to use for relabeling an object of class @tclass |
| 994 | * based on a SID pair (@ssid, @tsid). |
| 995 | * Return -%EINVAL if any of the parameters are invalid, -%ENOMEM |
| 996 | * if insufficient memory is available, or %0 if the SID was |
| 997 | * computed successfully. |
| 998 | */ |
| 999 | int security_change_sid(u32 ssid, |
| 1000 | u32 tsid, |
| 1001 | u16 tclass, |
| 1002 | u32 *out_sid) |
| 1003 | { |
| 1004 | return security_compute_sid(ssid, tsid, tclass, AVTAB_CHANGE, out_sid); |
| 1005 | } |
| 1006 | |
| 1007 | /* |
| 1008 | * Verify that each permission that is defined under the |
| 1009 | * existing policy is still defined with the same value |
| 1010 | * in the new policy. |
| 1011 | */ |
| 1012 | static int validate_perm(void *key, void *datum, void *p) |
| 1013 | { |
| 1014 | struct hashtab *h; |
| 1015 | struct perm_datum *perdatum, *perdatum2; |
| 1016 | int rc = 0; |
| 1017 | |
| 1018 | |
| 1019 | h = p; |
| 1020 | perdatum = datum; |
| 1021 | |
| 1022 | perdatum2 = hashtab_search(h, key); |
| 1023 | if (!perdatum2) { |
| 1024 | printk(KERN_ERR "security: permission %s disappeared", |
| 1025 | (char *)key); |
| 1026 | rc = -ENOENT; |
| 1027 | goto out; |
| 1028 | } |
| 1029 | if (perdatum->value != perdatum2->value) { |
| 1030 | printk(KERN_ERR "security: the value of permission %s changed", |
| 1031 | (char *)key); |
| 1032 | rc = -EINVAL; |
| 1033 | } |
| 1034 | out: |
| 1035 | return rc; |
| 1036 | } |
| 1037 | |
| 1038 | /* |
| 1039 | * Verify that each class that is defined under the |
| 1040 | * existing policy is still defined with the same |
| 1041 | * attributes in the new policy. |
| 1042 | */ |
| 1043 | static int validate_class(void *key, void *datum, void *p) |
| 1044 | { |
| 1045 | struct policydb *newp; |
| 1046 | struct class_datum *cladatum, *cladatum2; |
| 1047 | int rc; |
| 1048 | |
| 1049 | newp = p; |
| 1050 | cladatum = datum; |
| 1051 | |
| 1052 | cladatum2 = hashtab_search(newp->p_classes.table, key); |
| 1053 | if (!cladatum2) { |
| 1054 | printk(KERN_ERR "security: class %s disappeared\n", |
| 1055 | (char *)key); |
| 1056 | rc = -ENOENT; |
| 1057 | goto out; |
| 1058 | } |
| 1059 | if (cladatum->value != cladatum2->value) { |
| 1060 | printk(KERN_ERR "security: the value of class %s changed\n", |
| 1061 | (char *)key); |
| 1062 | rc = -EINVAL; |
| 1063 | goto out; |
| 1064 | } |
| 1065 | if ((cladatum->comdatum && !cladatum2->comdatum) || |
| 1066 | (!cladatum->comdatum && cladatum2->comdatum)) { |
| 1067 | printk(KERN_ERR "security: the inherits clause for the access " |
| 1068 | "vector definition for class %s changed\n", (char *)key); |
| 1069 | rc = -EINVAL; |
| 1070 | goto out; |
| 1071 | } |
| 1072 | if (cladatum->comdatum) { |
| 1073 | rc = hashtab_map(cladatum->comdatum->permissions.table, validate_perm, |
| 1074 | cladatum2->comdatum->permissions.table); |
| 1075 | if (rc) { |
| 1076 | printk(" in the access vector definition for class " |
| 1077 | "%s\n", (char *)key); |
| 1078 | goto out; |
| 1079 | } |
| 1080 | } |
| 1081 | rc = hashtab_map(cladatum->permissions.table, validate_perm, |
| 1082 | cladatum2->permissions.table); |
| 1083 | if (rc) |
| 1084 | printk(" in access vector definition for class %s\n", |
| 1085 | (char *)key); |
| 1086 | out: |
| 1087 | return rc; |
| 1088 | } |
| 1089 | |
| 1090 | /* Clone the SID into the new SID table. */ |
| 1091 | static int clone_sid(u32 sid, |
| 1092 | struct context *context, |
| 1093 | void *arg) |
| 1094 | { |
| 1095 | struct sidtab *s = arg; |
| 1096 | |
| 1097 | return sidtab_insert(s, sid, context); |
| 1098 | } |
| 1099 | |
| 1100 | static inline int convert_context_handle_invalid_context(struct context *context) |
| 1101 | { |
| 1102 | int rc = 0; |
| 1103 | |
| 1104 | if (selinux_enforcing) { |
| 1105 | rc = -EINVAL; |
| 1106 | } else { |
| 1107 | char *s; |
| 1108 | u32 len; |
| 1109 | |
| 1110 | context_struct_to_string(context, &s, &len); |
| 1111 | printk(KERN_ERR "security: context %s is invalid\n", s); |
| 1112 | kfree(s); |
| 1113 | } |
| 1114 | return rc; |
| 1115 | } |
| 1116 | |
| 1117 | struct convert_context_args { |
| 1118 | struct policydb *oldp; |
| 1119 | struct policydb *newp; |
| 1120 | }; |
| 1121 | |
| 1122 | /* |
| 1123 | * Convert the values in the security context |
| 1124 | * structure `c' from the values specified |
| 1125 | * in the policy `p->oldp' to the values specified |
| 1126 | * in the policy `p->newp'. Verify that the |
| 1127 | * context is valid under the new policy. |
| 1128 | */ |
| 1129 | static int convert_context(u32 key, |
| 1130 | struct context *c, |
| 1131 | void *p) |
| 1132 | { |
| 1133 | struct convert_context_args *args; |
| 1134 | struct context oldc; |
| 1135 | struct role_datum *role; |
| 1136 | struct type_datum *typdatum; |
| 1137 | struct user_datum *usrdatum; |
| 1138 | char *s; |
| 1139 | u32 len; |
| 1140 | int rc; |
| 1141 | |
| 1142 | args = p; |
| 1143 | |
| 1144 | rc = context_cpy(&oldc, c); |
| 1145 | if (rc) |
| 1146 | goto out; |
| 1147 | |
| 1148 | rc = -EINVAL; |
| 1149 | |
| 1150 | /* Convert the user. */ |
| 1151 | usrdatum = hashtab_search(args->newp->p_users.table, |
| 1152 | args->oldp->p_user_val_to_name[c->user - 1]); |
| 1153 | if (!usrdatum) { |
| 1154 | goto bad; |
| 1155 | } |
| 1156 | c->user = usrdatum->value; |
| 1157 | |
| 1158 | /* Convert the role. */ |
| 1159 | role = hashtab_search(args->newp->p_roles.table, |
| 1160 | args->oldp->p_role_val_to_name[c->role - 1]); |
| 1161 | if (!role) { |
| 1162 | goto bad; |
| 1163 | } |
| 1164 | c->role = role->value; |
| 1165 | |
| 1166 | /* Convert the type. */ |
| 1167 | typdatum = hashtab_search(args->newp->p_types.table, |
| 1168 | args->oldp->p_type_val_to_name[c->type - 1]); |
| 1169 | if (!typdatum) { |
| 1170 | goto bad; |
| 1171 | } |
| 1172 | c->type = typdatum->value; |
| 1173 | |
| 1174 | rc = mls_convert_context(args->oldp, args->newp, c); |
| 1175 | if (rc) |
| 1176 | goto bad; |
| 1177 | |
| 1178 | /* Check the validity of the new context. */ |
| 1179 | if (!policydb_context_isvalid(args->newp, c)) { |
| 1180 | rc = convert_context_handle_invalid_context(&oldc); |
| 1181 | if (rc) |
| 1182 | goto bad; |
| 1183 | } |
| 1184 | |
| 1185 | context_destroy(&oldc); |
| 1186 | out: |
| 1187 | return rc; |
| 1188 | bad: |
| 1189 | context_struct_to_string(&oldc, &s, &len); |
| 1190 | context_destroy(&oldc); |
| 1191 | printk(KERN_ERR "security: invalidating context %s\n", s); |
| 1192 | kfree(s); |
| 1193 | goto out; |
| 1194 | } |
| 1195 | |
| 1196 | extern void selinux_complete_init(void); |
| 1197 | |
| 1198 | /** |
| 1199 | * security_load_policy - Load a security policy configuration. |
| 1200 | * @data: binary policy data |
| 1201 | * @len: length of data in bytes |
| 1202 | * |
| 1203 | * Load a new set of security policy configuration data, |
| 1204 | * validate it and convert the SID table as necessary. |
| 1205 | * This function will flush the access vector cache after |
| 1206 | * loading the new policy. |
| 1207 | */ |
| 1208 | int security_load_policy(void *data, size_t len) |
| 1209 | { |
| 1210 | struct policydb oldpolicydb, newpolicydb; |
| 1211 | struct sidtab oldsidtab, newsidtab; |
| 1212 | struct convert_context_args args; |
| 1213 | u32 seqno; |
| 1214 | int rc = 0; |
| 1215 | struct policy_file file = { data, len }, *fp = &file; |
| 1216 | |
| 1217 | LOAD_LOCK; |
| 1218 | |
| 1219 | if (!ss_initialized) { |
| 1220 | avtab_cache_init(); |
| 1221 | if (policydb_read(&policydb, fp)) { |
| 1222 | LOAD_UNLOCK; |
| 1223 | avtab_cache_destroy(); |
| 1224 | return -EINVAL; |
| 1225 | } |
| 1226 | if (policydb_load_isids(&policydb, &sidtab)) { |
| 1227 | LOAD_UNLOCK; |
| 1228 | policydb_destroy(&policydb); |
| 1229 | avtab_cache_destroy(); |
| 1230 | return -EINVAL; |
| 1231 | } |
| 1232 | policydb_loaded_version = policydb.policyvers; |
| 1233 | ss_initialized = 1; |
Stephen Smalley | 4c443d1 | 2005-05-16 21:53:52 -0700 | [diff] [blame] | 1234 | seqno = ++latest_granting; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1235 | LOAD_UNLOCK; |
| 1236 | selinux_complete_init(); |
Stephen Smalley | 4c443d1 | 2005-05-16 21:53:52 -0700 | [diff] [blame] | 1237 | avc_ss_reset(seqno); |
| 1238 | selnl_notify_policyload(seqno); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1239 | return 0; |
| 1240 | } |
| 1241 | |
| 1242 | #if 0 |
| 1243 | sidtab_hash_eval(&sidtab, "sids"); |
| 1244 | #endif |
| 1245 | |
| 1246 | if (policydb_read(&newpolicydb, fp)) { |
| 1247 | LOAD_UNLOCK; |
| 1248 | return -EINVAL; |
| 1249 | } |
| 1250 | |
| 1251 | sidtab_init(&newsidtab); |
| 1252 | |
| 1253 | /* Verify that the existing classes did not change. */ |
| 1254 | if (hashtab_map(policydb.p_classes.table, validate_class, &newpolicydb)) { |
| 1255 | printk(KERN_ERR "security: the definition of an existing " |
| 1256 | "class changed\n"); |
| 1257 | rc = -EINVAL; |
| 1258 | goto err; |
| 1259 | } |
| 1260 | |
| 1261 | /* Clone the SID table. */ |
| 1262 | sidtab_shutdown(&sidtab); |
| 1263 | if (sidtab_map(&sidtab, clone_sid, &newsidtab)) { |
| 1264 | rc = -ENOMEM; |
| 1265 | goto err; |
| 1266 | } |
| 1267 | |
| 1268 | /* Convert the internal representations of contexts |
| 1269 | in the new SID table and remove invalid SIDs. */ |
| 1270 | args.oldp = &policydb; |
| 1271 | args.newp = &newpolicydb; |
| 1272 | sidtab_map_remove_on_error(&newsidtab, convert_context, &args); |
| 1273 | |
| 1274 | /* Save the old policydb and SID table to free later. */ |
| 1275 | memcpy(&oldpolicydb, &policydb, sizeof policydb); |
| 1276 | sidtab_set(&oldsidtab, &sidtab); |
| 1277 | |
| 1278 | /* Install the new policydb and SID table. */ |
| 1279 | POLICY_WRLOCK; |
| 1280 | memcpy(&policydb, &newpolicydb, sizeof policydb); |
| 1281 | sidtab_set(&sidtab, &newsidtab); |
| 1282 | seqno = ++latest_granting; |
| 1283 | policydb_loaded_version = policydb.policyvers; |
| 1284 | POLICY_WRUNLOCK; |
| 1285 | LOAD_UNLOCK; |
| 1286 | |
| 1287 | /* Free the old policydb and SID table. */ |
| 1288 | policydb_destroy(&oldpolicydb); |
| 1289 | sidtab_destroy(&oldsidtab); |
| 1290 | |
| 1291 | avc_ss_reset(seqno); |
| 1292 | selnl_notify_policyload(seqno); |
| 1293 | |
| 1294 | return 0; |
| 1295 | |
| 1296 | err: |
| 1297 | LOAD_UNLOCK; |
| 1298 | sidtab_destroy(&newsidtab); |
| 1299 | policydb_destroy(&newpolicydb); |
| 1300 | return rc; |
| 1301 | |
| 1302 | } |
| 1303 | |
| 1304 | /** |
| 1305 | * security_port_sid - Obtain the SID for a port. |
| 1306 | * @domain: communication domain aka address family |
| 1307 | * @type: socket type |
| 1308 | * @protocol: protocol number |
| 1309 | * @port: port number |
| 1310 | * @out_sid: security identifier |
| 1311 | */ |
| 1312 | int security_port_sid(u16 domain, |
| 1313 | u16 type, |
| 1314 | u8 protocol, |
| 1315 | u16 port, |
| 1316 | u32 *out_sid) |
| 1317 | { |
| 1318 | struct ocontext *c; |
| 1319 | int rc = 0; |
| 1320 | |
| 1321 | POLICY_RDLOCK; |
| 1322 | |
| 1323 | c = policydb.ocontexts[OCON_PORT]; |
| 1324 | while (c) { |
| 1325 | if (c->u.port.protocol == protocol && |
| 1326 | c->u.port.low_port <= port && |
| 1327 | c->u.port.high_port >= port) |
| 1328 | break; |
| 1329 | c = c->next; |
| 1330 | } |
| 1331 | |
| 1332 | if (c) { |
| 1333 | if (!c->sid[0]) { |
| 1334 | rc = sidtab_context_to_sid(&sidtab, |
| 1335 | &c->context[0], |
| 1336 | &c->sid[0]); |
| 1337 | if (rc) |
| 1338 | goto out; |
| 1339 | } |
| 1340 | *out_sid = c->sid[0]; |
| 1341 | } else { |
| 1342 | *out_sid = SECINITSID_PORT; |
| 1343 | } |
| 1344 | |
| 1345 | out: |
| 1346 | POLICY_RDUNLOCK; |
| 1347 | return rc; |
| 1348 | } |
| 1349 | |
| 1350 | /** |
| 1351 | * security_netif_sid - Obtain the SID for a network interface. |
| 1352 | * @name: interface name |
| 1353 | * @if_sid: interface SID |
| 1354 | * @msg_sid: default SID for received packets |
| 1355 | */ |
| 1356 | int security_netif_sid(char *name, |
| 1357 | u32 *if_sid, |
| 1358 | u32 *msg_sid) |
| 1359 | { |
| 1360 | int rc = 0; |
| 1361 | struct ocontext *c; |
| 1362 | |
| 1363 | POLICY_RDLOCK; |
| 1364 | |
| 1365 | c = policydb.ocontexts[OCON_NETIF]; |
| 1366 | while (c) { |
| 1367 | if (strcmp(name, c->u.name) == 0) |
| 1368 | break; |
| 1369 | c = c->next; |
| 1370 | } |
| 1371 | |
| 1372 | if (c) { |
| 1373 | if (!c->sid[0] || !c->sid[1]) { |
| 1374 | rc = sidtab_context_to_sid(&sidtab, |
| 1375 | &c->context[0], |
| 1376 | &c->sid[0]); |
| 1377 | if (rc) |
| 1378 | goto out; |
| 1379 | rc = sidtab_context_to_sid(&sidtab, |
| 1380 | &c->context[1], |
| 1381 | &c->sid[1]); |
| 1382 | if (rc) |
| 1383 | goto out; |
| 1384 | } |
| 1385 | *if_sid = c->sid[0]; |
| 1386 | *msg_sid = c->sid[1]; |
| 1387 | } else { |
| 1388 | *if_sid = SECINITSID_NETIF; |
| 1389 | *msg_sid = SECINITSID_NETMSG; |
| 1390 | } |
| 1391 | |
| 1392 | out: |
| 1393 | POLICY_RDUNLOCK; |
| 1394 | return rc; |
| 1395 | } |
| 1396 | |
| 1397 | static int match_ipv6_addrmask(u32 *input, u32 *addr, u32 *mask) |
| 1398 | { |
| 1399 | int i, fail = 0; |
| 1400 | |
| 1401 | for(i = 0; i < 4; i++) |
| 1402 | if(addr[i] != (input[i] & mask[i])) { |
| 1403 | fail = 1; |
| 1404 | break; |
| 1405 | } |
| 1406 | |
| 1407 | return !fail; |
| 1408 | } |
| 1409 | |
| 1410 | /** |
| 1411 | * security_node_sid - Obtain the SID for a node (host). |
| 1412 | * @domain: communication domain aka address family |
| 1413 | * @addrp: address |
| 1414 | * @addrlen: address length in bytes |
| 1415 | * @out_sid: security identifier |
| 1416 | */ |
| 1417 | int security_node_sid(u16 domain, |
| 1418 | void *addrp, |
| 1419 | u32 addrlen, |
| 1420 | u32 *out_sid) |
| 1421 | { |
| 1422 | int rc = 0; |
| 1423 | struct ocontext *c; |
| 1424 | |
| 1425 | POLICY_RDLOCK; |
| 1426 | |
| 1427 | switch (domain) { |
| 1428 | case AF_INET: { |
| 1429 | u32 addr; |
| 1430 | |
| 1431 | if (addrlen != sizeof(u32)) { |
| 1432 | rc = -EINVAL; |
| 1433 | goto out; |
| 1434 | } |
| 1435 | |
| 1436 | addr = *((u32 *)addrp); |
| 1437 | |
| 1438 | c = policydb.ocontexts[OCON_NODE]; |
| 1439 | while (c) { |
| 1440 | if (c->u.node.addr == (addr & c->u.node.mask)) |
| 1441 | break; |
| 1442 | c = c->next; |
| 1443 | } |
| 1444 | break; |
| 1445 | } |
| 1446 | |
| 1447 | case AF_INET6: |
| 1448 | if (addrlen != sizeof(u64) * 2) { |
| 1449 | rc = -EINVAL; |
| 1450 | goto out; |
| 1451 | } |
| 1452 | c = policydb.ocontexts[OCON_NODE6]; |
| 1453 | while (c) { |
| 1454 | if (match_ipv6_addrmask(addrp, c->u.node6.addr, |
| 1455 | c->u.node6.mask)) |
| 1456 | break; |
| 1457 | c = c->next; |
| 1458 | } |
| 1459 | break; |
| 1460 | |
| 1461 | default: |
| 1462 | *out_sid = SECINITSID_NODE; |
| 1463 | goto out; |
| 1464 | } |
| 1465 | |
| 1466 | if (c) { |
| 1467 | if (!c->sid[0]) { |
| 1468 | rc = sidtab_context_to_sid(&sidtab, |
| 1469 | &c->context[0], |
| 1470 | &c->sid[0]); |
| 1471 | if (rc) |
| 1472 | goto out; |
| 1473 | } |
| 1474 | *out_sid = c->sid[0]; |
| 1475 | } else { |
| 1476 | *out_sid = SECINITSID_NODE; |
| 1477 | } |
| 1478 | |
| 1479 | out: |
| 1480 | POLICY_RDUNLOCK; |
| 1481 | return rc; |
| 1482 | } |
| 1483 | |
| 1484 | #define SIDS_NEL 25 |
| 1485 | |
| 1486 | /** |
| 1487 | * security_get_user_sids - Obtain reachable SIDs for a user. |
| 1488 | * @fromsid: starting SID |
| 1489 | * @username: username |
| 1490 | * @sids: array of reachable SIDs for user |
| 1491 | * @nel: number of elements in @sids |
| 1492 | * |
| 1493 | * Generate the set of SIDs for legal security contexts |
| 1494 | * for a given user that can be reached by @fromsid. |
| 1495 | * Set *@sids to point to a dynamically allocated |
| 1496 | * array containing the set of SIDs. Set *@nel to the |
| 1497 | * number of elements in the array. |
| 1498 | */ |
| 1499 | |
| 1500 | int security_get_user_sids(u32 fromsid, |
| 1501 | char *username, |
| 1502 | u32 **sids, |
| 1503 | u32 *nel) |
| 1504 | { |
| 1505 | struct context *fromcon, usercon; |
| 1506 | u32 *mysids, *mysids2, sid; |
| 1507 | u32 mynel = 0, maxnel = SIDS_NEL; |
| 1508 | struct user_datum *user; |
| 1509 | struct role_datum *role; |
| 1510 | struct av_decision avd; |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 1511 | struct ebitmap_node *rnode, *tnode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1512 | int rc = 0, i, j; |
| 1513 | |
| 1514 | if (!ss_initialized) { |
| 1515 | *sids = NULL; |
| 1516 | *nel = 0; |
| 1517 | goto out; |
| 1518 | } |
| 1519 | |
| 1520 | POLICY_RDLOCK; |
| 1521 | |
| 1522 | fromcon = sidtab_search(&sidtab, fromsid); |
| 1523 | if (!fromcon) { |
| 1524 | rc = -EINVAL; |
| 1525 | goto out_unlock; |
| 1526 | } |
| 1527 | |
| 1528 | user = hashtab_search(policydb.p_users.table, username); |
| 1529 | if (!user) { |
| 1530 | rc = -EINVAL; |
| 1531 | goto out_unlock; |
| 1532 | } |
| 1533 | usercon.user = user->value; |
| 1534 | |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 1535 | mysids = kcalloc(maxnel, sizeof(*mysids), GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1536 | if (!mysids) { |
| 1537 | rc = -ENOMEM; |
| 1538 | goto out_unlock; |
| 1539 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1540 | |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 1541 | ebitmap_for_each_bit(&user->roles, rnode, i) { |
| 1542 | if (!ebitmap_node_get_bit(rnode, i)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1543 | continue; |
| 1544 | role = policydb.role_val_to_struct[i]; |
| 1545 | usercon.role = i+1; |
Stephen Smalley | 782ebb9 | 2005-09-03 15:55:16 -0700 | [diff] [blame] | 1546 | ebitmap_for_each_bit(&role->types, tnode, j) { |
| 1547 | if (!ebitmap_node_get_bit(tnode, j)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1548 | continue; |
| 1549 | usercon.type = j+1; |
| 1550 | |
| 1551 | if (mls_setup_user_range(fromcon, user, &usercon)) |
| 1552 | continue; |
| 1553 | |
| 1554 | rc = context_struct_compute_av(fromcon, &usercon, |
| 1555 | SECCLASS_PROCESS, |
| 1556 | PROCESS__TRANSITION, |
| 1557 | &avd); |
| 1558 | if (rc || !(avd.allowed & PROCESS__TRANSITION)) |
| 1559 | continue; |
| 1560 | rc = sidtab_context_to_sid(&sidtab, &usercon, &sid); |
| 1561 | if (rc) { |
| 1562 | kfree(mysids); |
| 1563 | goto out_unlock; |
| 1564 | } |
| 1565 | if (mynel < maxnel) { |
| 1566 | mysids[mynel++] = sid; |
| 1567 | } else { |
| 1568 | maxnel += SIDS_NEL; |
James Morris | 89d155e | 2005-10-30 14:59:21 -0800 | [diff] [blame] | 1569 | mysids2 = kcalloc(maxnel, sizeof(*mysids2), GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1570 | if (!mysids2) { |
| 1571 | rc = -ENOMEM; |
| 1572 | kfree(mysids); |
| 1573 | goto out_unlock; |
| 1574 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1575 | memcpy(mysids2, mysids, mynel * sizeof(*mysids2)); |
| 1576 | kfree(mysids); |
| 1577 | mysids = mysids2; |
| 1578 | mysids[mynel++] = sid; |
| 1579 | } |
| 1580 | } |
| 1581 | } |
| 1582 | |
| 1583 | *sids = mysids; |
| 1584 | *nel = mynel; |
| 1585 | |
| 1586 | out_unlock: |
| 1587 | POLICY_RDUNLOCK; |
| 1588 | out: |
| 1589 | return rc; |
| 1590 | } |
| 1591 | |
| 1592 | /** |
| 1593 | * security_genfs_sid - Obtain a SID for a file in a filesystem |
| 1594 | * @fstype: filesystem type |
| 1595 | * @path: path from root of mount |
| 1596 | * @sclass: file security class |
| 1597 | * @sid: SID for path |
| 1598 | * |
| 1599 | * Obtain a SID to use for a file in a filesystem that |
| 1600 | * cannot support xattr or use a fixed labeling behavior like |
| 1601 | * transition SIDs or task SIDs. |
| 1602 | */ |
| 1603 | int security_genfs_sid(const char *fstype, |
| 1604 | char *path, |
| 1605 | u16 sclass, |
| 1606 | u32 *sid) |
| 1607 | { |
| 1608 | int len; |
| 1609 | struct genfs *genfs; |
| 1610 | struct ocontext *c; |
| 1611 | int rc = 0, cmp = 0; |
| 1612 | |
| 1613 | POLICY_RDLOCK; |
| 1614 | |
| 1615 | for (genfs = policydb.genfs; genfs; genfs = genfs->next) { |
| 1616 | cmp = strcmp(fstype, genfs->fstype); |
| 1617 | if (cmp <= 0) |
| 1618 | break; |
| 1619 | } |
| 1620 | |
| 1621 | if (!genfs || cmp) { |
| 1622 | *sid = SECINITSID_UNLABELED; |
| 1623 | rc = -ENOENT; |
| 1624 | goto out; |
| 1625 | } |
| 1626 | |
| 1627 | for (c = genfs->head; c; c = c->next) { |
| 1628 | len = strlen(c->u.name); |
| 1629 | if ((!c->v.sclass || sclass == c->v.sclass) && |
| 1630 | (strncmp(c->u.name, path, len) == 0)) |
| 1631 | break; |
| 1632 | } |
| 1633 | |
| 1634 | if (!c) { |
| 1635 | *sid = SECINITSID_UNLABELED; |
| 1636 | rc = -ENOENT; |
| 1637 | goto out; |
| 1638 | } |
| 1639 | |
| 1640 | if (!c->sid[0]) { |
| 1641 | rc = sidtab_context_to_sid(&sidtab, |
| 1642 | &c->context[0], |
| 1643 | &c->sid[0]); |
| 1644 | if (rc) |
| 1645 | goto out; |
| 1646 | } |
| 1647 | |
| 1648 | *sid = c->sid[0]; |
| 1649 | out: |
| 1650 | POLICY_RDUNLOCK; |
| 1651 | return rc; |
| 1652 | } |
| 1653 | |
| 1654 | /** |
| 1655 | * security_fs_use - Determine how to handle labeling for a filesystem. |
| 1656 | * @fstype: filesystem type |
| 1657 | * @behavior: labeling behavior |
| 1658 | * @sid: SID for filesystem (superblock) |
| 1659 | */ |
| 1660 | int security_fs_use( |
| 1661 | const char *fstype, |
| 1662 | unsigned int *behavior, |
| 1663 | u32 *sid) |
| 1664 | { |
| 1665 | int rc = 0; |
| 1666 | struct ocontext *c; |
| 1667 | |
| 1668 | POLICY_RDLOCK; |
| 1669 | |
| 1670 | c = policydb.ocontexts[OCON_FSUSE]; |
| 1671 | while (c) { |
| 1672 | if (strcmp(fstype, c->u.name) == 0) |
| 1673 | break; |
| 1674 | c = c->next; |
| 1675 | } |
| 1676 | |
| 1677 | if (c) { |
| 1678 | *behavior = c->v.behavior; |
| 1679 | if (!c->sid[0]) { |
| 1680 | rc = sidtab_context_to_sid(&sidtab, |
| 1681 | &c->context[0], |
| 1682 | &c->sid[0]); |
| 1683 | if (rc) |
| 1684 | goto out; |
| 1685 | } |
| 1686 | *sid = c->sid[0]; |
| 1687 | } else { |
| 1688 | rc = security_genfs_sid(fstype, "/", SECCLASS_DIR, sid); |
| 1689 | if (rc) { |
| 1690 | *behavior = SECURITY_FS_USE_NONE; |
| 1691 | rc = 0; |
| 1692 | } else { |
| 1693 | *behavior = SECURITY_FS_USE_GENFS; |
| 1694 | } |
| 1695 | } |
| 1696 | |
| 1697 | out: |
| 1698 | POLICY_RDUNLOCK; |
| 1699 | return rc; |
| 1700 | } |
| 1701 | |
| 1702 | int security_get_bools(int *len, char ***names, int **values) |
| 1703 | { |
| 1704 | int i, rc = -ENOMEM; |
| 1705 | |
| 1706 | POLICY_RDLOCK; |
| 1707 | *names = NULL; |
| 1708 | *values = NULL; |
| 1709 | |
| 1710 | *len = policydb.p_bools.nprim; |
| 1711 | if (!*len) { |
| 1712 | rc = 0; |
| 1713 | goto out; |
| 1714 | } |
| 1715 | |
Jesper Juhl | e0795cf | 2006-01-09 20:54:46 -0800 | [diff] [blame] | 1716 | *names = kcalloc(*len, sizeof(char*), GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1717 | if (!*names) |
| 1718 | goto err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1719 | |
Jesper Juhl | e0795cf | 2006-01-09 20:54:46 -0800 | [diff] [blame] | 1720 | *values = kcalloc(*len, sizeof(int), GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1721 | if (!*values) |
| 1722 | goto err; |
| 1723 | |
| 1724 | for (i = 0; i < *len; i++) { |
| 1725 | size_t name_len; |
| 1726 | (*values)[i] = policydb.bool_val_to_struct[i]->state; |
| 1727 | name_len = strlen(policydb.p_bool_val_to_name[i]) + 1; |
Jesper Juhl | e0795cf | 2006-01-09 20:54:46 -0800 | [diff] [blame] | 1728 | (*names)[i] = kmalloc(sizeof(char) * name_len, GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1729 | if (!(*names)[i]) |
| 1730 | goto err; |
| 1731 | strncpy((*names)[i], policydb.p_bool_val_to_name[i], name_len); |
| 1732 | (*names)[i][name_len - 1] = 0; |
| 1733 | } |
| 1734 | rc = 0; |
| 1735 | out: |
| 1736 | POLICY_RDUNLOCK; |
| 1737 | return rc; |
| 1738 | err: |
| 1739 | if (*names) { |
| 1740 | for (i = 0; i < *len; i++) |
Jesper Juhl | 9a5f04b | 2005-06-25 14:58:51 -0700 | [diff] [blame] | 1741 | kfree((*names)[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1742 | } |
Jesper Juhl | 9a5f04b | 2005-06-25 14:58:51 -0700 | [diff] [blame] | 1743 | kfree(*values); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1744 | goto out; |
| 1745 | } |
| 1746 | |
| 1747 | |
| 1748 | int security_set_bools(int len, int *values) |
| 1749 | { |
| 1750 | int i, rc = 0; |
| 1751 | int lenp, seqno = 0; |
| 1752 | struct cond_node *cur; |
| 1753 | |
| 1754 | POLICY_WRLOCK; |
| 1755 | |
| 1756 | lenp = policydb.p_bools.nprim; |
| 1757 | if (len != lenp) { |
| 1758 | rc = -EFAULT; |
| 1759 | goto out; |
| 1760 | } |
| 1761 | |
| 1762 | printk(KERN_INFO "security: committed booleans { "); |
| 1763 | for (i = 0; i < len; i++) { |
| 1764 | if (values[i]) { |
| 1765 | policydb.bool_val_to_struct[i]->state = 1; |
| 1766 | } else { |
| 1767 | policydb.bool_val_to_struct[i]->state = 0; |
| 1768 | } |
| 1769 | if (i != 0) |
| 1770 | printk(", "); |
| 1771 | printk("%s:%d", policydb.p_bool_val_to_name[i], |
| 1772 | policydb.bool_val_to_struct[i]->state); |
| 1773 | } |
| 1774 | printk(" }\n"); |
| 1775 | |
| 1776 | for (cur = policydb.cond_list; cur != NULL; cur = cur->next) { |
| 1777 | rc = evaluate_cond_node(&policydb, cur); |
| 1778 | if (rc) |
| 1779 | goto out; |
| 1780 | } |
| 1781 | |
| 1782 | seqno = ++latest_granting; |
| 1783 | |
| 1784 | out: |
| 1785 | POLICY_WRUNLOCK; |
| 1786 | if (!rc) { |
| 1787 | avc_ss_reset(seqno); |
| 1788 | selnl_notify_policyload(seqno); |
| 1789 | } |
| 1790 | return rc; |
| 1791 | } |
| 1792 | |
| 1793 | int security_get_bool_value(int bool) |
| 1794 | { |
| 1795 | int rc = 0; |
| 1796 | int len; |
| 1797 | |
| 1798 | POLICY_RDLOCK; |
| 1799 | |
| 1800 | len = policydb.p_bools.nprim; |
| 1801 | if (bool >= len) { |
| 1802 | rc = -EFAULT; |
| 1803 | goto out; |
| 1804 | } |
| 1805 | |
| 1806 | rc = policydb.bool_val_to_struct[bool]->state; |
| 1807 | out: |
| 1808 | POLICY_RDUNLOCK; |
| 1809 | return rc; |
| 1810 | } |