security/tomoyo/file.c

   1 /*
   2  * security/tomoyo/file.c
   3  *
   4  * Copyright (C) 2005-2011  NTT DATA CORPORATION
   5  */
   6
   7 #include "common.h"
   8 #include <linux/slab.h>
   9
  10 /*
  11  * Mapping table from "enum tomoyo_path_acl_index" to "enum tomoyo_mac_index".
  12  */
  13 static const u8 tomoyo_p2mac[TOMOYO_MAX_PATH_OPERATION] = {
  14         [TOMOYO_TYPE_EXECUTE]    = TOMOYO_MAC_FILE_EXECUTE,
  15         [TOMOYO_TYPE_READ]       = TOMOYO_MAC_FILE_OPEN,
  16         [TOMOYO_TYPE_WRITE]      = TOMOYO_MAC_FILE_OPEN,
  17         [TOMOYO_TYPE_APPEND]     = TOMOYO_MAC_FILE_OPEN,
  18         [TOMOYO_TYPE_UNLINK]     = TOMOYO_MAC_FILE_UNLINK,
  19         [TOMOYO_TYPE_GETATTR]    = TOMOYO_MAC_FILE_GETATTR,
  20         [TOMOYO_TYPE_RMDIR]      = TOMOYO_MAC_FILE_RMDIR,
  21         [TOMOYO_TYPE_TRUNCATE]   = TOMOYO_MAC_FILE_TRUNCATE,
  22         [TOMOYO_TYPE_SYMLINK]    = TOMOYO_MAC_FILE_SYMLINK,
  23         [TOMOYO_TYPE_CHROOT]     = TOMOYO_MAC_FILE_CHROOT,
  24         [TOMOYO_TYPE_UMOUNT]     = TOMOYO_MAC_FILE_UMOUNT,
  25 };
  26
  27 /*
  28  * Mapping table from "enum tomoyo_mkdev_acl_index" to "enum tomoyo_mac_index".
  29  */
  30 const u8 tomoyo_pnnn2mac[TOMOYO_MAX_MKDEV_OPERATION] = {
  31         [TOMOYO_TYPE_MKBLOCK] = TOMOYO_MAC_FILE_MKBLOCK,
  32         [TOMOYO_TYPE_MKCHAR]  = TOMOYO_MAC_FILE_MKCHAR,
  33 };
  34
  35 /*
  36  * Mapping table from "enum tomoyo_path2_acl_index" to "enum tomoyo_mac_index".
  37  */
  38 const u8 tomoyo_pp2mac[TOMOYO_MAX_PATH2_OPERATION] = {
  39         [TOMOYO_TYPE_LINK]       = TOMOYO_MAC_FILE_LINK,
  40         [TOMOYO_TYPE_RENAME]     = TOMOYO_MAC_FILE_RENAME,
  41         [TOMOYO_TYPE_PIVOT_ROOT] = TOMOYO_MAC_FILE_PIVOT_ROOT,
  42 };
  43
  44 /*
  45  * Mapping table from "enum tomoyo_path_number_acl_index" to
  46  * "enum tomoyo_mac_index".
  47  */
  48 const u8 tomoyo_pn2mac[TOMOYO_MAX_PATH_NUMBER_OPERATION] = {
  49         [TOMOYO_TYPE_CREATE] = TOMOYO_MAC_FILE_CREATE,
  50         [TOMOYO_TYPE_MKDIR]  = TOMOYO_MAC_FILE_MKDIR,
  51         [TOMOYO_TYPE_MKFIFO] = TOMOYO_MAC_FILE_MKFIFO,
  52         [TOMOYO_TYPE_MKSOCK] = TOMOYO_MAC_FILE_MKSOCK,
  53         [TOMOYO_TYPE_IOCTL]  = TOMOYO_MAC_FILE_IOCTL,
  54         [TOMOYO_TYPE_CHMOD]  = TOMOYO_MAC_FILE_CHMOD,
  55         [TOMOYO_TYPE_CHOWN]  = TOMOYO_MAC_FILE_CHOWN,
  56         [TOMOYO_TYPE_CHGRP]  = TOMOYO_MAC_FILE_CHGRP,
  57 };
  58
  59 /**
  60  * tomoyo_put_name_union - Drop reference on "struct tomoyo_name_union".
  61  *
  62  * @ptr: Pointer to "struct tomoyo_name_union".
  63  *
  64  * Returns nothing.
  65  */
  66 void tomoyo_put_name_union(struct tomoyo_name_union *ptr)
  67 {
  68         tomoyo_put_group(ptr->group);
  69         tomoyo_put_name(ptr->filename);
  70 }
  71
  72 /**
  73  * tomoyo_compare_name_union - Check whether a name matches "struct tomoyo_name_union" or not.
  74  *
  75  * @name: Pointer to "struct tomoyo_path_info".
  76  * @ptr:  Pointer to "struct tomoyo_name_union".
  77  *
  78  * Returns "struct tomoyo_path_info" if @name matches @ptr, NULL otherwise.
  79  */
  80 const struct tomoyo_path_info *
  81 tomoyo_compare_name_union(const struct tomoyo_path_info *name,
  82                           const struct tomoyo_name_union *ptr)
  83 {
  84         if (ptr->group)
  85                 return tomoyo_path_matches_group(name, ptr->group);
  86         if (tomoyo_path_matches_pattern(name, ptr->filename))
  87                 return ptr->filename;
  88         return NULL;
  89 }
  90
  91 /**
  92  * tomoyo_put_number_union - Drop reference on "struct tomoyo_number_union".
  93  *
  94  * @ptr: Pointer to "struct tomoyo_number_union".
  95  *
  96  * Returns nothing.
  97  */
  98 void tomoyo_put_number_union(struct tomoyo_number_union *ptr)
  99 {
 100         tomoyo_put_group(ptr->group);
 101 }
 102
 103 /**
 104  * tomoyo_compare_number_union - Check whether a value matches "struct tomoyo_number_union" or not.
 105  *
 106  * @value: Number to check.
 107  * @ptr:   Pointer to "struct tomoyo_number_union".
 108  *
 109  * Returns true if @value matches @ptr, false otherwise.
 110  */
 111 bool tomoyo_compare_number_union(const unsigned long value,
 112                                  const struct tomoyo_number_union *ptr)
 113 {
 114         if (ptr->group)
 115                 return tomoyo_number_matches_group(value, value, ptr->group);
 116         return value >= ptr->values[0] && value <= ptr->values[1];
 117 }
 118
 119 /**
 120  * tomoyo_add_slash - Add trailing '/' if needed.
 121  *
 122  * @buf: Pointer to "struct tomoyo_path_info".
 123  *
 124  * Returns nothing.
 125  *
 126  * @buf must be generated by tomoyo_encode() because this function does not
 127  * allocate memory for adding '/'.
 128  */
 129 static void tomoyo_add_slash(struct tomoyo_path_info *buf)
 130 {
 131         if (buf->is_dir)
 132                 return;
 133         /*
 134          * This is OK because tomoyo_encode() reserves space for appending "/".
 135          */
 136         strcat((char *) buf->name, "/");
 137         tomoyo_fill_path_info(buf);
 138 }
 139
 140 /**
 141  * tomoyo_get_realpath - Get realpath.
 142  *
 143  * @buf:  Pointer to "struct tomoyo_path_info".
 144  * @path: Pointer to "struct path".
 145  *
 146  * Returns true on success, false otherwise.
 147  */
 148 static bool tomoyo_get_realpath(struct tomoyo_path_info *buf, struct path *path)
 149 {
 150         buf->name = tomoyo_realpath_from_path(path);
 151         if (buf->name) {
 152                 tomoyo_fill_path_info(buf);
 153                 return true;
 154         }
 155         return false;
 156 }
 157
 158 /**
 159  * tomoyo_audit_path_log - Audit path request log.
 160  *
 161  * @r: Pointer to "struct tomoyo_request_info".
 162  *
 163  * Returns 0 on success, negative value otherwise.
 164  */
 165 static int tomoyo_audit_path_log(struct tomoyo_request_info *r)
 166 {
 167         return tomoyo_supervisor(r, "file %s %s\n", tomoyo_path_keyword
 168                                  [r->param.path.operation],
 169                                  r->param.path.filename->name);
 170 }
 171
 172 /**
 173  * tomoyo_audit_path2_log - Audit path/path request log.
 174  *
 175  * @r: Pointer to "struct tomoyo_request_info".
 176  *
 177  * Returns 0 on success, negative value otherwise.
 178  */
 179 static int tomoyo_audit_path2_log(struct tomoyo_request_info *r)
 180 {
 181         return tomoyo_supervisor(r, "file %s %s %s\n", tomoyo_mac_keywords
 182                                  [tomoyo_pp2mac[r->param.path2.operation]],
 183                                  r->param.path2.filename1->name,
 184                                  r->param.path2.filename2->name);
 185 }
 186
 187 /**
 188  * tomoyo_audit_mkdev_log - Audit path/number/number/number request log.
 189  *
 190  * @r: Pointer to "struct tomoyo_request_info".
 191  *
 192  * Returns 0 on success, negative value otherwise.
 193  */
 194 static int tomoyo_audit_mkdev_log(struct tomoyo_request_info *r)
 195 {
 196         return tomoyo_supervisor(r, "file %s %s 0%o %u %u\n",
 197                                  tomoyo_mac_keywords
 198                                  [tomoyo_pnnn2mac[r->param.mkdev.operation]],
 199                                  r->param.mkdev.filename->name,
 200                                  r->param.mkdev.mode, r->param.mkdev.major,
 201                                  r->param.mkdev.minor);
 202 }
 203
 204 /**
 205  * tomoyo_audit_path_number_log - Audit path/number request log.
 206  *
 207  * @r: Pointer to "struct tomoyo_request_info".
 208  *
 209  * Returns 0 on success, negative value otherwise.
 210  */
 211 static int tomoyo_audit_path_number_log(struct tomoyo_request_info *r)
 212 {
 213         const u8 type = r->param.path_number.operation;
 214         u8 radix;
 215         char buffer[64];
 216         switch (type) {
 217         case TOMOYO_TYPE_CREATE:
 218         case TOMOYO_TYPE_MKDIR:
 219         case TOMOYO_TYPE_MKFIFO:
 220         case TOMOYO_TYPE_MKSOCK:
 221         case TOMOYO_TYPE_CHMOD:
 222                 radix = TOMOYO_VALUE_TYPE_OCTAL;
 223                 break;
 224         case TOMOYO_TYPE_IOCTL:
 225                 radix = TOMOYO_VALUE_TYPE_HEXADECIMAL;
 226                 break;
 227         default:
 228                 radix = TOMOYO_VALUE_TYPE_DECIMAL;
 229                 break;
 230         }
 231         tomoyo_print_ulong(buffer, sizeof(buffer), r->param.path_number.number,
 232                            radix);
 233         return tomoyo_supervisor(r, "file %s %s %s\n", tomoyo_mac_keywords
 234                                  [tomoyo_pn2mac[type]],
 235                                  r->param.path_number.filename->name, buffer);
 236 }
 237
 238 /**
 239  * tomoyo_check_path_acl - Check permission for path operation.
 240  *
 241  * @r:   Pointer to "struct tomoyo_request_info".
 242  * @ptr: Pointer to "struct tomoyo_acl_info".
 243  *
 244  * Returns true if granted, false otherwise.
 245  *
 246  * To be able to use wildcard for domain transition, this function sets
 247  * matching entry on success. Since the caller holds tomoyo_read_lock(),
 248  * it is safe to set matching entry.
 249  */
 250 static bool tomoyo_check_path_acl(struct tomoyo_request_info *r,
 251                                   const struct tomoyo_acl_info *ptr)
 252 {
 253         const struct tomoyo_path_acl *acl = container_of(ptr, typeof(*acl),
 254                                                          head);
 255         if (acl->perm & (1 << r->param.path.operation)) {
 256                 r->param.path.matched_path =
 257                         tomoyo_compare_name_union(r->param.path.filename,
 258                                                   &acl->name);
 259                 return r->param.path.matched_path != NULL;
 260         }
 261         return false;
 262 }
 263
 264 /**
 265  * tomoyo_check_path_number_acl - Check permission for path number operation.
 266  *
 267  * @r:   Pointer to "struct tomoyo_request_info".
 268  * @ptr: Pointer to "struct tomoyo_acl_info".
 269  *
 270  * Returns true if granted, false otherwise.
 271  */
 272 static bool tomoyo_check_path_number_acl(struct tomoyo_request_info *r,
 273                                          const struct tomoyo_acl_info *ptr)
 274 {
 275         const struct tomoyo_path_number_acl *acl =
 276                 container_of(ptr, typeof(*acl), head);
 277         return (acl->perm & (1 << r->param.path_number.operation)) &&
 278                 tomoyo_compare_number_union(r->param.path_number.number,
 279                                             &acl->number) &&
 280                 tomoyo_compare_name_union(r->param.path_number.filename,
 281                                           &acl->name);
 282 }
 283
 284 /**
 285  * tomoyo_check_path2_acl - Check permission for path path operation.
 286  *
 287  * @r:   Pointer to "struct tomoyo_request_info".
 288  * @ptr: Pointer to "struct tomoyo_acl_info".
 289  *
 290  * Returns true if granted, false otherwise.
 291  */
 292 static bool tomoyo_check_path2_acl(struct tomoyo_request_info *r,
 293                                    const struct tomoyo_acl_info *ptr)
 294 {
 295         const struct tomoyo_path2_acl *acl =
 296                 container_of(ptr, typeof(*acl), head);
 297         return (acl->perm & (1 << r->param.path2.operation)) &&
 298                 tomoyo_compare_name_union(r->param.path2.filename1, &acl->name1)
 299                 && tomoyo_compare_name_union(r->param.path2.filename2,
 300                                              &acl->name2);
 301 }
 302
 303 /**
 304  * tomoyo_check_mkdev_acl - Check permission for path number number number operation.
 305  *
 306  * @r:   Pointer to "struct tomoyo_request_info".
 307  * @ptr: Pointer to "struct tomoyo_acl_info".
 308  *
 309  * Returns true if granted, false otherwise.
 310  */
 311 static bool tomoyo_check_mkdev_acl(struct tomoyo_request_info *r,
 312                                    const struct tomoyo_acl_info *ptr)
 313 {
 314         const struct tomoyo_mkdev_acl *acl =
 315                 container_of(ptr, typeof(*acl), head);
 316         return (acl->perm & (1 << r->param.mkdev.operation)) &&
 317                 tomoyo_compare_number_union(r->param.mkdev.mode,
 318                                             &acl->mode) &&
 319                 tomoyo_compare_number_union(r->param.mkdev.major,
 320                                             &acl->major) &&
 321                 tomoyo_compare_number_union(r->param.mkdev.minor,
 322                                             &acl->minor) &&
 323                 tomoyo_compare_name_union(r->param.mkdev.filename,
 324                                           &acl->name);
 325 }
 326
 327 /**
 328  * tomoyo_same_path_acl - Check for duplicated "struct tomoyo_path_acl" entry.
 329  *
 330  * @a: Pointer to "struct tomoyo_acl_info".
 331  * @b: Pointer to "struct tomoyo_acl_info".
 332  *
 333  * Returns true if @a == @b except permission bits, false otherwise.
 334  */
 335 static bool tomoyo_same_path_acl(const struct tomoyo_acl_info *a,
 336                                  const struct tomoyo_acl_info *b)
 337 {
 338         const struct tomoyo_path_acl *p1 = container_of(a, typeof(*p1), head);
 339         const struct tomoyo_path_acl *p2 = container_of(b, typeof(*p2), head);
 340         return tomoyo_same_name_union(&p1->name, &p2->name);
 341 }
 342
 343 /**
 344  * tomoyo_merge_path_acl - Merge duplicated "struct tomoyo_path_acl" entry.
 345  *
 346  * @a:         Pointer to "struct tomoyo_acl_info".
 347  * @b:         Pointer to "struct tomoyo_acl_info".
 348  * @is_delete: True for @a &= ~@b, false for @a |= @b.
 349  *
 350  * Returns true if @a is empty, false otherwise.
 351  */
 352 static bool tomoyo_merge_path_acl(struct tomoyo_acl_info *a,
 353                                   struct tomoyo_acl_info *b,
 354                                   const bool is_delete)
 355 {
 356         u16 * const a_perm = &container_of(a, struct tomoyo_path_acl, head)
 357                 ->perm;
 358         u16 perm = *a_perm;
 359         const u16 b_perm = container_of(b, struct tomoyo_path_acl, head)->perm;
 360         if (is_delete)
 361                 perm &= ~b_perm;
 362         else
 363                 perm |= b_perm;
 364         *a_perm = perm;
 365         return !perm;
 366 }
 367
 368 /**
 369  * tomoyo_update_path_acl - Update "struct tomoyo_path_acl" list.
 370  *
 371  * @perm:  Permission.
 372  * @param: Pointer to "struct tomoyo_acl_param".
 373  *
 374  * Returns 0 on success, negative value otherwise.
 375  *
 376  * Caller holds tomoyo_read_lock().
 377  */
 378 static int tomoyo_update_path_acl(const u16 perm,
 379                                   struct tomoyo_acl_param *param)
 380 {
 381         struct tomoyo_path_acl e = {
 382                 .head.type = TOMOYO_TYPE_PATH_ACL,
 383                 .perm = perm
 384         };
 385         int error;
 386         if (!tomoyo_parse_name_union(param, &e.name))
 387                 error = -EINVAL;
 388         else
 389                 error = tomoyo_update_domain(&e.head, sizeof(e), param,
 390                                              tomoyo_same_path_acl,
 391                                              tomoyo_merge_path_acl);
 392         tomoyo_put_name_union(&e.name);
 393         return error;
 394 }
 395
 396 /**
 397  * tomoyo_same_mkdev_acl - Check for duplicated "struct tomoyo_mkdev_acl" entry.
 398  *
 399  * @a: Pointer to "struct tomoyo_acl_info".
 400  * @b: Pointer to "struct tomoyo_acl_info".
 401  *
 402  * Returns true if @a == @b except permission bits, false otherwise.
 403  */
 404 static bool tomoyo_same_mkdev_acl(const struct tomoyo_acl_info *a,
 405                                          const struct tomoyo_acl_info *b)
 406 {
 407         const struct tomoyo_mkdev_acl *p1 = container_of(a, typeof(*p1), head);
 408         const struct tomoyo_mkdev_acl *p2 = container_of(b, typeof(*p2), head);
 409         return tomoyo_same_name_union(&p1->name, &p2->name) &&
 410                 tomoyo_same_number_union(&p1->mode, &p2->mode) &&
 411                 tomoyo_same_number_union(&p1->major, &p2->major) &&
 412                 tomoyo_same_number_union(&p1->minor, &p2->minor);
 413 }
 414
 415 /**
 416  * tomoyo_merge_mkdev_acl - Merge duplicated "struct tomoyo_mkdev_acl" entry.
 417  *
 418  * @a:         Pointer to "struct tomoyo_acl_info".
 419  * @b:         Pointer to "struct tomoyo_acl_info".
 420  * @is_delete: True for @a &= ~@b, false for @a |= @b.
 421  *
 422  * Returns true if @a is empty, false otherwise.
 423  */
 424 static bool tomoyo_merge_mkdev_acl(struct tomoyo_acl_info *a,
 425                                    struct tomoyo_acl_info *b,
 426                                    const bool is_delete)
 427 {
 428         u8 *const a_perm = &container_of(a, struct tomoyo_mkdev_acl,
 429                                          head)->perm;
 430         u8 perm = *a_perm;
 431         const u8 b_perm = container_of(b, struct tomoyo_mkdev_acl, head)
 432                 ->perm;
 433         if (is_delete)
 434                 perm &= ~b_perm;
 435         else
 436                 perm |= b_perm;
 437         *a_perm = perm;
 438         return !perm;
 439 }
 440
 441 /**
 442  * tomoyo_update_mkdev_acl - Update "struct tomoyo_mkdev_acl" list.
 443  *
 444  * @perm:  Permission.
 445  * @param: Pointer to "struct tomoyo_acl_param".
 446  *
 447  * Returns 0 on success, negative value otherwise.
 448  *
 449  * Caller holds tomoyo_read_lock().
 450  */
 451 static int tomoyo_update_mkdev_acl(const u8 perm,
 452                                    struct tomoyo_acl_param *param)
 453 {
 454         struct tomoyo_mkdev_acl e = {
 455                 .head.type = TOMOYO_TYPE_MKDEV_ACL,
 456                 .perm = perm
 457         };
 458         int error;
 459         if (!tomoyo_parse_name_union(param, &e.name) ||
 460             !tomoyo_parse_number_union(param, &e.mode) ||
 461             !tomoyo_parse_number_union(param, &e.major) ||
 462             !tomoyo_parse_number_union(param, &e.minor))
 463                 error = -EINVAL;
 464         else
 465                 error = tomoyo_update_domain(&e.head, sizeof(e), param,
 466                                              tomoyo_same_mkdev_acl,
 467                                              tomoyo_merge_mkdev_acl);
 468         tomoyo_put_name_union(&e.name);
 469         tomoyo_put_number_union(&e.mode);
 470         tomoyo_put_number_union(&e.major);
 471         tomoyo_put_number_union(&e.minor);
 472         return error;
 473 }
 474
 475 /**
 476  * tomoyo_same_path2_acl - Check for duplicated "struct tomoyo_path2_acl" entry.
 477  *
 478  * @a: Pointer to "struct tomoyo_acl_info".
 479  * @b: Pointer to "struct tomoyo_acl_info".
 480  *
 481  * Returns true if @a == @b except permission bits, false otherwise.
 482  */
 483 static bool tomoyo_same_path2_acl(const struct tomoyo_acl_info *a,
 484                                   const struct tomoyo_acl_info *b)
 485 {
 486         const struct tomoyo_path2_acl *p1 = container_of(a, typeof(*p1), head);
 487         const struct tomoyo_path2_acl *p2 = container_of(b, typeof(*p2), head);
 488         return tomoyo_same_name_union(&p1->name1, &p2->name1) &&
 489                 tomoyo_same_name_union(&p1->name2, &p2->name2);
 490 }
 491
 492 /**
 493  * tomoyo_merge_path2_acl - Merge duplicated "struct tomoyo_path2_acl" entry.
 494  *
 495  * @a:         Pointer to "struct tomoyo_acl_info".
 496  * @b:         Pointer to "struct tomoyo_acl_info".
 497  * @is_delete: True for @a &= ~@b, false for @a |= @b.
 498  *
 499  * Returns true if @a is empty, false otherwise.
 500  */
 501 static bool tomoyo_merge_path2_acl(struct tomoyo_acl_info *a,
 502                                    struct tomoyo_acl_info *b,
 503                                    const bool is_delete)
 504 {
 505         u8 * const a_perm = &container_of(a, struct tomoyo_path2_acl, head)
 506                 ->perm;
 507         u8 perm = *a_perm;
 508         const u8 b_perm = container_of(b, struct tomoyo_path2_acl, head)->perm;
 509         if (is_delete)
 510                 perm &= ~b_perm;
 511         else
 512                 perm |= b_perm;
 513         *a_perm = perm;
 514         return !perm;
 515 }
 516
 517 /**
 518  * tomoyo_update_path2_acl - Update "struct tomoyo_path2_acl" list.
 519  *
 520  * @perm:  Permission.
 521  * @param: Pointer to "struct tomoyo_acl_param".
 522  *
 523  * Returns 0 on success, negative value otherwise.
 524  *
 525  * Caller holds tomoyo_read_lock().
 526  */
 527 static int tomoyo_update_path2_acl(const u8 perm,
 528                                    struct tomoyo_acl_param *param)
 529 {
 530         struct tomoyo_path2_acl e = {
 531                 .head.type = TOMOYO_TYPE_PATH2_ACL,
 532                 .perm = perm
 533         };
 534         int error;
 535         if (!tomoyo_parse_name_union(param, &e.name1) ||
 536             !tomoyo_parse_name_union(param, &e.name2))
 537                 error = -EINVAL;
 538         else
 539                 error = tomoyo_update_domain(&e.head, sizeof(e), param,
 540                                              tomoyo_same_path2_acl,
 541                                              tomoyo_merge_path2_acl);
 542         tomoyo_put_name_union(&e.name1);
 543         tomoyo_put_name_union(&e.name2);
 544         return error;
 545 }
 546
 547 /**
 548  * tomoyo_path_permission - Check permission for single path operation.
 549  *
 550  * @r:         Pointer to "struct tomoyo_request_info".
 551  * @operation: Type of operation.
 552  * @filename:  Filename to check.
 553  *
 554  * Returns 0 on success, negative value otherwise.
 555  *
 556  * Caller holds tomoyo_read_lock().
 557  */
 558 static int tomoyo_path_permission(struct tomoyo_request_info *r, u8 operation,
 559                                   const struct tomoyo_path_info *filename)
 560 {
 561         int error;
 562
 563         r->type = tomoyo_p2mac[operation];
 564         r->mode = tomoyo_get_mode(r->domain->ns, r->profile, r->type);
 565         if (r->mode == TOMOYO_CONFIG_DISABLED)
 566                 return 0;
 567         r->param_type = TOMOYO_TYPE_PATH_ACL;
 568         r->param.path.filename = filename;
 569         r->param.path.operation = operation;
 570         do {
 571                 tomoyo_check_acl(r, tomoyo_check_path_acl);
 572                 error = tomoyo_audit_path_log(r);
 573         } while (error == TOMOYO_RETRY_REQUEST);
 574         return error;
 575 }
 576
 577 /**
 578  * tomoyo_execute_permission - Check permission for execute operation.
 579  *
 580  * @r:         Pointer to "struct tomoyo_request_info".
 581  * @filename:  Filename to check.
 582  *
 583  * Returns 0 on success, negative value otherwise.
 584  *
 585  * Caller holds tomoyo_read_lock().
 586  */
 587 int tomoyo_execute_permission(struct tomoyo_request_info *r,
 588                               const struct tomoyo_path_info *filename)
 589 {
 590         /*
 591          * Unlike other permission checks, this check is done regardless of
 592          * profile mode settings in order to check for domain transition
 593          * preference.
 594          */
 595         r->type = TOMOYO_MAC_FILE_EXECUTE;
 596         r->mode = tomoyo_get_mode(r->domain->ns, r->profile, r->type);
 597         r->param_type = TOMOYO_TYPE_PATH_ACL;
 598         r->param.path.filename = filename;
 599         r->param.path.operation = TOMOYO_TYPE_EXECUTE;
 600         tomoyo_check_acl(r, tomoyo_check_path_acl);
 601         r->ee->transition = r->matched_acl && r->matched_acl->cond ?
 602                 r->matched_acl->cond->transit : NULL;
 603         if (r->mode != TOMOYO_CONFIG_DISABLED)
 604                 return tomoyo_audit_path_log(r);
 605         return 0;
 606 }
 607
 608 /**
 609  * tomoyo_same_path_number_acl - Check for duplicated "struct tomoyo_path_number_acl" entry.
 610  *
 611  * @a: Pointer to "struct tomoyo_acl_info".
 612  * @b: Pointer to "struct tomoyo_acl_info".
 613  *
 614  * Returns true if @a == @b except permission bits, false otherwise.
 615  */
 616 static bool tomoyo_same_path_number_acl(const struct tomoyo_acl_info *a,
 617                                         const struct tomoyo_acl_info *b)
 618 {
 619         const struct tomoyo_path_number_acl *p1 = container_of(a, typeof(*p1),
 620                                                                head);
 621         const struct tomoyo_path_number_acl *p2 = container_of(b, typeof(*p2),
 622                                                                head);
 623         return tomoyo_same_name_union(&p1->name, &p2->name) &&
 624                 tomoyo_same_number_union(&p1->number, &p2->number);
 625 }
 626
 627 /**
 628  * tomoyo_merge_path_number_acl - Merge duplicated "struct tomoyo_path_number_acl" entry.
 629  *
 630  * @a:         Pointer to "struct tomoyo_acl_info".
 631  * @b:         Pointer to "struct tomoyo_acl_info".
 632  * @is_delete: True for @a &= ~@b, false for @a |= @b.
 633  *
 634  * Returns true if @a is empty, false otherwise.
 635  */
 636 static bool tomoyo_merge_path_number_acl(struct tomoyo_acl_info *a,
 637                                          struct tomoyo_acl_info *b,
 638                                          const bool is_delete)
 639 {
 640         u8 * const a_perm = &container_of(a, struct tomoyo_path_number_acl,
 641                                           head)->perm;
 642         u8 perm = *a_perm;
 643         const u8 b_perm = container_of(b, struct tomoyo_path_number_acl, head)
 644                 ->perm;
 645         if (is_delete)
 646                 perm &= ~b_perm;
 647         else
 648                 perm |= b_perm;
 649         *a_perm = perm;
 650         return !perm;
 651 }
 652
 653 /**
 654  * tomoyo_update_path_number_acl - Update ioctl/chmod/chown/chgrp ACL.
 655  *
 656  * @perm:  Permission.
 657  * @param: Pointer to "struct tomoyo_acl_param".
 658  *
 659  * Returns 0 on success, negative value otherwise.
 660  */
 661 static int tomoyo_update_path_number_acl(const u8 perm,
 662                                          struct tomoyo_acl_param *param)
 663 {
 664         struct tomoyo_path_number_acl e = {
 665                 .head.type = TOMOYO_TYPE_PATH_NUMBER_ACL,
 666                 .perm = perm
 667         };
 668         int error;
 669         if (!tomoyo_parse_name_union(param, &e.name) ||
 670             !tomoyo_parse_number_union(param, &e.number))
 671                 error = -EINVAL;
 672         else
 673                 error = tomoyo_update_domain(&e.head, sizeof(e), param,
 674                                              tomoyo_same_path_number_acl,
 675                                              tomoyo_merge_path_number_acl);
 676         tomoyo_put_name_union(&e.name);
 677         tomoyo_put_number_union(&e.number);
 678         return error;
 679 }
 680
 681 /**
 682  * tomoyo_path_number_perm - Check permission for "create", "mkdir", "mkfifo", "mksock", "ioctl", "chmod", "chown", "chgrp".
 683  *
 684  * @type:   Type of operation.
 685  * @path:   Pointer to "struct path".
 686  * @number: Number.
 687  *
 688  * Returns 0 on success, negative value otherwise.
 689  */
 690 int tomoyo_path_number_perm(const u8 type, struct path *path,
 691                             unsigned long number)
 692 {
 693         struct tomoyo_request_info r;
 694         struct tomoyo_obj_info obj = {
 695                 .path1 = *path,
 696         };
 697         int error = -ENOMEM;
 698         struct tomoyo_path_info buf;
 699         int idx;
 700
 701         if (tomoyo_init_request_info(&r, NULL, tomoyo_pn2mac[type])
 702             == TOMOYO_CONFIG_DISABLED || !path->dentry)
 703                 return 0;
 704         idx = tomoyo_read_lock();
 705         if (!tomoyo_get_realpath(&buf, path))
 706                 goto out;
 707         r.obj = &obj;
 708         if (type == TOMOYO_TYPE_MKDIR)
 709                 tomoyo_add_slash(&buf);
 710         r.param_type = TOMOYO_TYPE_PATH_NUMBER_ACL;
 711         r.param.path_number.operation = type;
 712         r.param.path_number.filename = &buf;
 713         r.param.path_number.number = number;
 714         do {
 715                 tomoyo_check_acl(&r, tomoyo_check_path_number_acl);
 716                 error = tomoyo_audit_path_number_log(&r);
 717         } while (error == TOMOYO_RETRY_REQUEST);
 718         kfree(buf.name);
 719  out:
 720         tomoyo_read_unlock(idx);
 721         if (r.mode != TOMOYO_CONFIG_ENFORCING)
 722                 error = 0;
 723         return error;
 724 }
 725
 726 /**
 727  * tomoyo_check_open_permission - Check permission for "read" and "write".
 728  *
 729  * @domain: Pointer to "struct tomoyo_domain_info".
 730  * @path:   Pointer to "struct path".
 731  * @flag:   Flags for open().
 732  *
 733  * Returns 0 on success, negative value otherwise.
 734  */
 735 int tomoyo_check_open_permission(struct tomoyo_domain_info *domain,
 736                                  struct path *path, const int flag)
 737 {
 738         const u8 acc_mode = ACC_MODE(flag);
 739         int error = 0;
 740         struct tomoyo_path_info buf;
 741         struct tomoyo_request_info r;
 742         struct tomoyo_obj_info obj = {
 743                 .path1 = *path,
 744         };
 745         int idx;
 746
 747         buf.name = NULL;
 748         r.mode = TOMOYO_CONFIG_DISABLED;
 749         idx = tomoyo_read_lock();
 750         if (acc_mode &&
 751             tomoyo_init_request_info(&r, domain, TOMOYO_MAC_FILE_OPEN)
 752             != TOMOYO_CONFIG_DISABLED) {
 753                 if (!tomoyo_get_realpath(&buf, path)) {
 754                         error = -ENOMEM;
 755                         goto out;
 756                 }
 757                 r.obj = &obj;
 758                 if (acc_mode & MAY_READ)
 759                         error = tomoyo_path_permission(&r, TOMOYO_TYPE_READ,
 760                                                        &buf);
 761                 if (!error && (acc_mode & MAY_WRITE))
 762                         error = tomoyo_path_permission(&r, (flag & O_APPEND) ?
 763                                                        TOMOYO_TYPE_APPEND :
 764                                                        TOMOYO_TYPE_WRITE,
 765                                                        &buf);
 766         }
 767  out:
 768         kfree(buf.name);
 769         tomoyo_read_unlock(idx);
 770         if (r.mode != TOMOYO_CONFIG_ENFORCING)
 771                 error = 0;
 772         return error;
 773 }
 774
 775 /**
 776  * tomoyo_path_perm - Check permission for "unlink", "rmdir", "truncate", "symlink", "append", "chroot" and "unmount".
 777  *
 778  * @operation: Type of operation.
 779  * @path:      Pointer to "struct path".
 780  * @target:    Symlink's target if @operation is TOMOYO_TYPE_SYMLINK,
 781  *             NULL otherwise.
 782  *
 783  * Returns 0 on success, negative value otherwise.
 784  */
 785 int tomoyo_path_perm(const u8 operation, struct path *path, const char *target)
 786 {
 787         struct tomoyo_request_info r;
 788         struct tomoyo_obj_info obj = {
 789                 .path1 = *path,
 790         };
 791         int error;
 792         struct tomoyo_path_info buf;
 793         bool is_enforce;
 794         struct tomoyo_path_info symlink_target;
 795         int idx;
 796
 797         if (tomoyo_init_request_info(&r, NULL, tomoyo_p2mac[operation])
 798             == TOMOYO_CONFIG_DISABLED)
 799                 return 0;
 800         is_enforce = (r.mode == TOMOYO_CONFIG_ENFORCING);
 801         error = -ENOMEM;
 802         buf.name = NULL;
 803         idx = tomoyo_read_lock();
 804         if (!tomoyo_get_realpath(&buf, path))
 805                 goto out;
 806         r.obj = &obj;
 807         switch (operation) {
 808         case TOMOYO_TYPE_RMDIR:
 809         case TOMOYO_TYPE_CHROOT:
 810                 tomoyo_add_slash(&buf);
 811                 break;
 812         case TOMOYO_TYPE_SYMLINK:
 813                 symlink_target.name = tomoyo_encode(target);
 814                 if (!symlink_target.name)
 815                         goto out;
 816                 tomoyo_fill_path_info(&symlink_target);
 817                 obj.symlink_target = &symlink_target;
 818                 break;
 819         }
 820         error = tomoyo_path_permission(&r, operation, &buf);
 821         if (operation == TOMOYO_TYPE_SYMLINK)
 822                 kfree(symlink_target.name);
 823  out:
 824         kfree(buf.name);
 825         tomoyo_read_unlock(idx);
 826         if (!is_enforce)
 827                 error = 0;
 828         return error;
 829 }
 830
 831 /**
 832  * tomoyo_mkdev_perm - Check permission for "mkblock" and "mkchar".
 833  *
 834  * @operation: Type of operation. (TOMOYO_TYPE_MKCHAR or TOMOYO_TYPE_MKBLOCK)
 835  * @path:      Pointer to "struct path".
 836  * @mode:      Create mode.
 837  * @dev:       Device number.
 838  *
 839  * Returns 0 on success, negative value otherwise.
 840  */
 841 int tomoyo_mkdev_perm(const u8 operation, struct path *path,
 842                       const unsigned int mode, unsigned int dev)
 843 {
 844         struct tomoyo_request_info r;
 845         struct tomoyo_obj_info obj = {
 846                 .path1 = *path,
 847         };
 848         int error = -ENOMEM;
 849         struct tomoyo_path_info buf;
 850         int idx;
 851
 852         if (tomoyo_init_request_info(&r, NULL, tomoyo_pnnn2mac[operation])
 853             == TOMOYO_CONFIG_DISABLED)
 854                 return 0;
 855         idx = tomoyo_read_lock();
 856         error = -ENOMEM;
 857         if (tomoyo_get_realpath(&buf, path)) {
 858                 r.obj = &obj;
 859                 dev = new_decode_dev(dev);
 860                 r.param_type = TOMOYO_TYPE_MKDEV_ACL;
 861                 r.param.mkdev.filename = &buf;
 862                 r.param.mkdev.operation = operation;
 863                 r.param.mkdev.mode = mode;
 864                 r.param.mkdev.major = MAJOR(dev);
 865                 r.param.mkdev.minor = MINOR(dev);
 866                 tomoyo_check_acl(&r, tomoyo_check_mkdev_acl);
 867                 error = tomoyo_audit_mkdev_log(&r);
 868                 kfree(buf.name);
 869         }
 870         tomoyo_read_unlock(idx);
 871         if (r.mode != TOMOYO_CONFIG_ENFORCING)
 872                 error = 0;
 873         return error;
 874 }
 875
 876 /**
 877  * tomoyo_path2_perm - Check permission for "rename", "link" and "pivot_root".
 878  *
 879  * @operation: Type of operation.
 880  * @path1:      Pointer to "struct path".
 881  * @path2:      Pointer to "struct path".
 882  *
 883  * Returns 0 on success, negative value otherwise.
 884  */
 885 int tomoyo_path2_perm(const u8 operation, struct path *path1,
 886                       struct path *path2)
 887 {
 888         int error = -ENOMEM;
 889         struct tomoyo_path_info buf1;
 890         struct tomoyo_path_info buf2;
 891         struct tomoyo_request_info r;
 892         struct tomoyo_obj_info obj = {
 893                 .path1 = *path1,
 894                 .path2 = *path2,
 895         };
 896         int idx;
 897
 898         if (tomoyo_init_request_info(&r, NULL, tomoyo_pp2mac[operation])
 899             == TOMOYO_CONFIG_DISABLED)
 900                 return 0;
 901         buf1.name = NULL;
 902         buf2.name = NULL;
 903         idx = tomoyo_read_lock();
 904         if (!tomoyo_get_realpath(&buf1, path1) ||
 905             !tomoyo_get_realpath(&buf2, path2))
 906                 goto out;
 907         switch (operation) {
 908                 struct dentry *dentry;
 909         case TOMOYO_TYPE_RENAME:
 910         case TOMOYO_TYPE_LINK:
 911                 dentry = path1->dentry;
 912                 if (!dentry->d_inode || !S_ISDIR(dentry->d_inode->i_mode))
 913                         break;
 914                 /* fall through */
 915         case TOMOYO_TYPE_PIVOT_ROOT:
 916                 tomoyo_add_slash(&buf1);
 917                 tomoyo_add_slash(&buf2);
 918                 break;
 919         }
 920         r.obj = &obj;
 921         r.param_type = TOMOYO_TYPE_PATH2_ACL;
 922         r.param.path2.operation = operation;
 923         r.param.path2.filename1 = &buf1;
 924         r.param.path2.filename2 = &buf2;
 925         do {
 926                 tomoyo_check_acl(&r, tomoyo_check_path2_acl);
 927                 error = tomoyo_audit_path2_log(&r);
 928         } while (error == TOMOYO_RETRY_REQUEST);
 929  out:
 930         kfree(buf1.name);
 931         kfree(buf2.name);
 932         tomoyo_read_unlock(idx);
 933         if (r.mode != TOMOYO_CONFIG_ENFORCING)
 934                 error = 0;
 935         return error;
 936 }
 937
 938 /**
 939  * tomoyo_same_mount_acl - Check for duplicated "struct tomoyo_mount_acl" entry.
 940  *
 941  * @a: Pointer to "struct tomoyo_acl_info".
 942  * @b: Pointer to "struct tomoyo_acl_info".
 943  *
 944  * Returns true if @a == @b, false otherwise.
 945  */
 946 static bool tomoyo_same_mount_acl(const struct tomoyo_acl_info *a,
 947                                   const struct tomoyo_acl_info *b)
 948 {
 949         const struct tomoyo_mount_acl *p1 = container_of(a, typeof(*p1), head);
 950         const struct tomoyo_mount_acl *p2 = container_of(b, typeof(*p2), head);
 951         return tomoyo_same_name_union(&p1->dev_name, &p2->dev_name) &&
 952                 tomoyo_same_name_union(&p1->dir_name, &p2->dir_name) &&
 953                 tomoyo_same_name_union(&p1->fs_type, &p2->fs_type) &&
 954                 tomoyo_same_number_union(&p1->flags, &p2->flags);
 955 }
 956
 957 /**
 958  * tomoyo_update_mount_acl - Write "struct tomoyo_mount_acl" list.
 959  *
 960  * @param: Pointer to "struct tomoyo_acl_param".
 961  *
 962  * Returns 0 on success, negative value otherwise.
 963  *
 964  * Caller holds tomoyo_read_lock().
 965  */
 966 static int tomoyo_update_mount_acl(struct tomoyo_acl_param *param)
 967 {
 968         struct tomoyo_mount_acl e = { .head.type = TOMOYO_TYPE_MOUNT_ACL };
 969         int error;
 970         if (!tomoyo_parse_name_union(param, &e.dev_name) ||
 971             !tomoyo_parse_name_union(param, &e.dir_name) ||
 972             !tomoyo_parse_name_union(param, &e.fs_type) ||
 973             !tomoyo_parse_number_union(param, &e.flags))
 974                 error = -EINVAL;
 975         else
 976                 error = tomoyo_update_domain(&e.head, sizeof(e), param,
 977                                              tomoyo_same_mount_acl, NULL);
 978         tomoyo_put_name_union(&e.dev_name);
 979         tomoyo_put_name_union(&e.dir_name);
 980         tomoyo_put_name_union(&e.fs_type);
 981         tomoyo_put_number_union(&e.flags);
 982         return error;
 983 }
 984
 985 /**
 986  * tomoyo_write_file - Update file related list.
 987  *
 988  * @param: Pointer to "struct tomoyo_acl_param".
 989  *
 990  * Returns 0 on success, negative value otherwise.
 991  *
 992  * Caller holds tomoyo_read_lock().
 993  */
 994 int tomoyo_write_file(struct tomoyo_acl_param *param)
 995 {
 996         u16 perm = 0;
 997         u8 type;
 998         const char *operation = tomoyo_read_token(param);
 999         for (type = 0; type < TOMOYO_MAX_PATH_OPERATION; type++)
1000                 if (tomoyo_permstr(operation, tomoyo_path_keyword[type]))
1001                         perm |= 1 << type;
1002         if (perm)
1003                 return tomoyo_update_path_acl(perm, param);
1004         for (type = 0; type < TOMOYO_MAX_PATH2_OPERATION; type++)
1005                 if (tomoyo_permstr(operation,
1006                                    tomoyo_mac_keywords[tomoyo_pp2mac[type]]))
1007                         perm |= 1 << type;
1008         if (perm)
1009                 return tomoyo_update_path2_acl(perm, param);
1010         for (type = 0; type < TOMOYO_MAX_PATH_NUMBER_OPERATION; type++)
1011                 if (tomoyo_permstr(operation,
1012                                    tomoyo_mac_keywords[tomoyo_pn2mac[type]]))
1013                         perm |= 1 << type;
1014         if (perm)
1015                 return tomoyo_update_path_number_acl(perm, param);
1016         for (type = 0; type < TOMOYO_MAX_MKDEV_OPERATION; type++)
1017                 if (tomoyo_permstr(operation,
1018                                    tomoyo_mac_keywords[tomoyo_pnnn2mac[type]]))
1019                         perm |= 1 << type;
1020         if (perm)
1021                 return tomoyo_update_mkdev_acl(perm, param);
1022         if (tomoyo_permstr(operation,
1023                            tomoyo_mac_keywords[TOMOYO_MAC_FILE_MOUNT]))
1024                 return tomoyo_update_mount_acl(param);
1025         return -EINVAL;
1026 }