security/tomoyo/file.c

   1 /*
   2  * security/tomoyo/file.c
   3  *
   4  * Pathname restriction functions.
   5  *
   6  * Copyright (C) 2005-2010  NTT DATA CORPORATION
   7  */
   8
   9 #include "common.h"
  10 #include <linux/slab.h>
  11
  12 /* Keyword array for operations with one pathname. */
  13 const char *tomoyo_path_keyword[TOMOYO_MAX_PATH_OPERATION] = {
  14         [TOMOYO_TYPE_EXECUTE]    = "execute",
  15         [TOMOYO_TYPE_READ]       = "read",
  16         [TOMOYO_TYPE_WRITE]      = "write",
  17         [TOMOYO_TYPE_APPEND]     = "append",
  18         [TOMOYO_TYPE_UNLINK]     = "unlink",
  19         [TOMOYO_TYPE_GETATTR]    = "getattr",
  20         [TOMOYO_TYPE_RMDIR]      = "rmdir",
  21         [TOMOYO_TYPE_TRUNCATE]   = "truncate",
  22         [TOMOYO_TYPE_SYMLINK]    = "symlink",
  23         [TOMOYO_TYPE_CHROOT]     = "chroot",
  24         [TOMOYO_TYPE_UMOUNT]     = "unmount",
  25 };
  26
  27 /* Keyword array for operations with one pathname and three numbers. */
  28 const char *tomoyo_mkdev_keyword[TOMOYO_MAX_MKDEV_OPERATION] = {
  29         [TOMOYO_TYPE_MKBLOCK]    = "mkblock",
  30         [TOMOYO_TYPE_MKCHAR]     = "mkchar",
  31 };
  32
  33 /* Keyword array for operations with two pathnames. */
  34 const char *tomoyo_path2_keyword[TOMOYO_MAX_PATH2_OPERATION] = {
  35         [TOMOYO_TYPE_LINK]       = "link",
  36         [TOMOYO_TYPE_RENAME]     = "rename",
  37         [TOMOYO_TYPE_PIVOT_ROOT] = "pivot_root",
  38 };
  39
  40 /* Keyword array for operations with one pathname and one number. */
  41 const char *tomoyo_path_number_keyword[TOMOYO_MAX_PATH_NUMBER_OPERATION] = {
  42         [TOMOYO_TYPE_CREATE]     = "create",
  43         [TOMOYO_TYPE_MKDIR]      = "mkdir",
  44         [TOMOYO_TYPE_MKFIFO]     = "mkfifo",
  45         [TOMOYO_TYPE_MKSOCK]     = "mksock",
  46         [TOMOYO_TYPE_IOCTL]      = "ioctl",
  47         [TOMOYO_TYPE_CHMOD]      = "chmod",
  48         [TOMOYO_TYPE_CHOWN]      = "chown",
  49         [TOMOYO_TYPE_CHGRP]      = "chgrp",
  50 };
  51
  52 static const u8 tomoyo_p2mac[TOMOYO_MAX_PATH_OPERATION] = {
  53         [TOMOYO_TYPE_EXECUTE]    = TOMOYO_MAC_FILE_EXECUTE,
  54         [TOMOYO_TYPE_READ]       = TOMOYO_MAC_FILE_OPEN,
  55         [TOMOYO_TYPE_WRITE]      = TOMOYO_MAC_FILE_OPEN,
  56         [TOMOYO_TYPE_APPEND]     = TOMOYO_MAC_FILE_OPEN,
  57         [TOMOYO_TYPE_UNLINK]     = TOMOYO_MAC_FILE_UNLINK,
  58         [TOMOYO_TYPE_GETATTR]    = TOMOYO_MAC_FILE_GETATTR,
  59         [TOMOYO_TYPE_RMDIR]      = TOMOYO_MAC_FILE_RMDIR,
  60         [TOMOYO_TYPE_TRUNCATE]   = TOMOYO_MAC_FILE_TRUNCATE,
  61         [TOMOYO_TYPE_SYMLINK]    = TOMOYO_MAC_FILE_SYMLINK,
  62         [TOMOYO_TYPE_CHROOT]     = TOMOYO_MAC_FILE_CHROOT,
  63         [TOMOYO_TYPE_UMOUNT]     = TOMOYO_MAC_FILE_UMOUNT,
  64 };
  65
  66 static const u8 tomoyo_pnnn2mac[TOMOYO_MAX_MKDEV_OPERATION] = {
  67         [TOMOYO_TYPE_MKBLOCK] = TOMOYO_MAC_FILE_MKBLOCK,
  68         [TOMOYO_TYPE_MKCHAR]  = TOMOYO_MAC_FILE_MKCHAR,
  69 };
  70
  71 static const u8 tomoyo_pp2mac[TOMOYO_MAX_PATH2_OPERATION] = {
  72         [TOMOYO_TYPE_LINK]       = TOMOYO_MAC_FILE_LINK,
  73         [TOMOYO_TYPE_RENAME]     = TOMOYO_MAC_FILE_RENAME,
  74         [TOMOYO_TYPE_PIVOT_ROOT] = TOMOYO_MAC_FILE_PIVOT_ROOT,
  75 };
  76
  77 static const u8 tomoyo_pn2mac[TOMOYO_MAX_PATH_NUMBER_OPERATION] = {
  78         [TOMOYO_TYPE_CREATE] = TOMOYO_MAC_FILE_CREATE,
  79         [TOMOYO_TYPE_MKDIR]  = TOMOYO_MAC_FILE_MKDIR,
  80         [TOMOYO_TYPE_MKFIFO] = TOMOYO_MAC_FILE_MKFIFO,
  81         [TOMOYO_TYPE_MKSOCK] = TOMOYO_MAC_FILE_MKSOCK,
  82         [TOMOYO_TYPE_IOCTL]  = TOMOYO_MAC_FILE_IOCTL,
  83         [TOMOYO_TYPE_CHMOD]  = TOMOYO_MAC_FILE_CHMOD,
  84         [TOMOYO_TYPE_CHOWN]  = TOMOYO_MAC_FILE_CHOWN,
  85         [TOMOYO_TYPE_CHGRP]  = TOMOYO_MAC_FILE_CHGRP,
  86 };
  87
  88 void tomoyo_put_name_union(struct tomoyo_name_union *ptr)
  89 {
  90         if (!ptr)
  91                 return;
  92         if (ptr->is_group)
  93                 tomoyo_put_group(ptr->group);
  94         else
  95                 tomoyo_put_name(ptr->filename);
  96 }
  97
  98 const struct tomoyo_path_info *
  99 tomoyo_compare_name_union(const struct tomoyo_path_info *name,
 100                           const struct tomoyo_name_union *ptr)
 101 {
 102         if (ptr->is_group)
 103                 return tomoyo_path_matches_group(name, ptr->group);
 104         if (tomoyo_path_matches_pattern(name, ptr->filename))
 105                 return ptr->filename;
 106         return NULL;
 107 }
 108
 109 void tomoyo_put_number_union(struct tomoyo_number_union *ptr)
 110 {
 111         if (ptr && ptr->is_group)
 112                 tomoyo_put_group(ptr->group);
 113 }
 114
 115 bool tomoyo_compare_number_union(const unsigned long value,
 116                                  const struct tomoyo_number_union *ptr)
 117 {
 118         if (ptr->is_group)
 119                 return tomoyo_number_matches_group(value, value, ptr->group);
 120         return value >= ptr->values[0] && value <= ptr->values[1];
 121 }
 122
 123 static void tomoyo_add_slash(struct tomoyo_path_info *buf)
 124 {
 125         if (buf->is_dir)
 126                 return;
 127         /*
 128          * This is OK because tomoyo_encode() reserves space for appending "/".
 129          */
 130         strcat((char *) buf->name, "/");
 131         tomoyo_fill_path_info(buf);
 132 }
 133
 134 /**
 135  * tomoyo_get_realpath - Get realpath.
 136  *
 137  * @buf:  Pointer to "struct tomoyo_path_info".
 138  * @path: Pointer to "struct path".
 139  *
 140  * Returns true on success, false otherwise.
 141  */
 142 static bool tomoyo_get_realpath(struct tomoyo_path_info *buf, struct path *path)
 143 {
 144         buf->name = tomoyo_realpath_from_path(path);
 145         if (buf->name) {
 146                 tomoyo_fill_path_info(buf);
 147                 return true;
 148         }
 149         return false;
 150 }
 151
 152 /**
 153  * tomoyo_audit_path_log - Audit path request log.
 154  *
 155  * @r: Pointer to "struct tomoyo_request_info".
 156  *
 157  * Returns 0 on success, negative value otherwise.
 158  */
 159 static int tomoyo_audit_path_log(struct tomoyo_request_info *r)
 160 {
 161         const char *operation = tomoyo_path_keyword[r->param.path.operation];
 162         const struct tomoyo_path_info *filename = r->param.path.filename;
 163         if (r->granted)
 164                 return 0;
 165         tomoyo_warn_log(r, "%s %s", operation, filename->name);
 166         return tomoyo_supervisor(r, "allow_%s %s\n", operation,
 167                                  filename->name);
 168 }
 169
 170 /**
 171  * tomoyo_audit_path2_log - Audit path/path request log.
 172  *
 173  * @r: Pointer to "struct tomoyo_request_info".
 174  *
 175  * Returns 0 on success, negative value otherwise.
 176  */
 177 static int tomoyo_audit_path2_log(struct tomoyo_request_info *r)
 178 {
 179         const char *operation = tomoyo_path2_keyword[r->param.path2.operation];
 180         const struct tomoyo_path_info *filename1 = r->param.path2.filename1;
 181         const struct tomoyo_path_info *filename2 = r->param.path2.filename2;
 182         if (r->granted)
 183                 return 0;
 184         tomoyo_warn_log(r, "%s %s %s", operation, filename1->name,
 185                         filename2->name);
 186         return tomoyo_supervisor(r, "allow_%s %s %s\n", operation,
 187                                  filename1->name, filename2->name);
 188 }
 189
 190 /**
 191  * tomoyo_audit_mkdev_log - Audit path/number/number/number request log.
 192  *
 193  * @r: Pointer to "struct tomoyo_request_info".
 194  *
 195  * Returns 0 on success, negative value otherwise.
 196  */
 197 static int tomoyo_audit_mkdev_log(struct tomoyo_request_info *r)
 198 {
 199         const char *operation = tomoyo_mkdev_keyword[r->param.mkdev.operation];
 200         const struct tomoyo_path_info *filename = r->param.mkdev.filename;
 201         const unsigned int major = r->param.mkdev.major;
 202         const unsigned int minor = r->param.mkdev.minor;
 203         const unsigned int mode = r->param.mkdev.mode;
 204         if (r->granted)
 205                 return 0;
 206         tomoyo_warn_log(r, "%s %s 0%o %u %u", operation, filename->name, mode,
 207                         major, minor);
 208         return tomoyo_supervisor(r, "allow_%s %s 0%o %u %u\n", operation,
 209                                  filename->name, mode, major, minor);
 210 }
 211
 212 /**
 213  * tomoyo_audit_path_number_log - Audit path/number request log.
 214  *
 215  * @r:     Pointer to "struct tomoyo_request_info".
 216  * @error: Error code.
 217  *
 218  * Returns 0 on success, negative value otherwise.
 219  */
 220 static int tomoyo_audit_path_number_log(struct tomoyo_request_info *r)
 221 {
 222         const u8 type = r->param.path_number.operation;
 223         u8 radix;
 224         const struct tomoyo_path_info *filename = r->param.path_number.filename;
 225         const char *operation = tomoyo_path_number_keyword[type];
 226         char buffer[64];
 227         if (r->granted)
 228                 return 0;
 229         switch (type) {
 230         case TOMOYO_TYPE_CREATE:
 231         case TOMOYO_TYPE_MKDIR:
 232         case TOMOYO_TYPE_MKFIFO:
 233         case TOMOYO_TYPE_MKSOCK:
 234         case TOMOYO_TYPE_CHMOD:
 235                 radix = TOMOYO_VALUE_TYPE_OCTAL;
 236                 break;
 237         case TOMOYO_TYPE_IOCTL:
 238                 radix = TOMOYO_VALUE_TYPE_HEXADECIMAL;
 239                 break;
 240         default:
 241                 radix = TOMOYO_VALUE_TYPE_DECIMAL;
 242                 break;
 243         }
 244         tomoyo_print_ulong(buffer, sizeof(buffer), r->param.path_number.number,
 245                            radix);
 246         tomoyo_warn_log(r, "%s %s %s", operation, filename->name, buffer);
 247         return tomoyo_supervisor(r, "allow_%s %s %s\n", operation,
 248                                  filename->name, buffer);
 249 }
 250
 251 static bool tomoyo_check_path_acl(struct tomoyo_request_info *r,
 252                                   const struct tomoyo_acl_info *ptr)
 253 {
 254         const struct tomoyo_path_acl *acl = container_of(ptr, typeof(*acl),
 255                                                          head);
 256         if (acl->perm & (1 << r->param.path.operation)) {
 257                 r->param.path.matched_path =
 258                         tomoyo_compare_name_union(r->param.path.filename,
 259                                                   &acl->name);
 260                 return r->param.path.matched_path != NULL;
 261         }
 262         return false;
 263 }
 264
 265 static bool tomoyo_check_path_number_acl(struct tomoyo_request_info *r,
 266                                          const struct tomoyo_acl_info *ptr)
 267 {
 268         const struct tomoyo_path_number_acl *acl =
 269                 container_of(ptr, typeof(*acl), head);
 270         return (acl->perm & (1 << r->param.path_number.operation)) &&
 271                 tomoyo_compare_number_union(r->param.path_number.number,
 272                                             &acl->number) &&
 273                 tomoyo_compare_name_union(r->param.path_number.filename,
 274                                           &acl->name);
 275 }
 276
 277 static bool tomoyo_check_path2_acl(struct tomoyo_request_info *r,
 278                                    const struct tomoyo_acl_info *ptr)
 279 {
 280         const struct tomoyo_path2_acl *acl =
 281                 container_of(ptr, typeof(*acl), head);
 282         return (acl->perm & (1 << r->param.path2.operation)) &&
 283                 tomoyo_compare_name_union(r->param.path2.filename1, &acl->name1)
 284                 && tomoyo_compare_name_union(r->param.path2.filename2,
 285                                              &acl->name2);
 286 }
 287
 288 static bool tomoyo_check_mkdev_acl(struct tomoyo_request_info *r,
 289                                 const struct tomoyo_acl_info *ptr)
 290 {
 291         const struct tomoyo_mkdev_acl *acl =
 292                 container_of(ptr, typeof(*acl), head);
 293         return (acl->perm & (1 << r->param.mkdev.operation)) &&
 294                 tomoyo_compare_number_union(r->param.mkdev.mode,
 295                                             &acl->mode) &&
 296                 tomoyo_compare_number_union(r->param.mkdev.major,
 297                                             &acl->major) &&
 298                 tomoyo_compare_number_union(r->param.mkdev.minor,
 299                                             &acl->minor) &&
 300                 tomoyo_compare_name_union(r->param.mkdev.filename,
 301                                           &acl->name);
 302 }
 303
 304 static bool tomoyo_same_path_acl(const struct tomoyo_acl_info *a,
 305                                  const struct tomoyo_acl_info *b)
 306 {
 307         const struct tomoyo_path_acl *p1 = container_of(a, typeof(*p1), head);
 308         const struct tomoyo_path_acl *p2 = container_of(b, typeof(*p2), head);
 309         return tomoyo_same_acl_head(&p1->head, &p2->head) &&
 310                 tomoyo_same_name_union(&p1->name, &p2->name);
 311 }
 312
 313 /**
 314  * tomoyo_merge_path_acl - Merge duplicated "struct tomoyo_path_acl" entry.
 315  *
 316  * @a:         Pointer to "struct tomoyo_acl_info".
 317  * @b:         Pointer to "struct tomoyo_acl_info".
 318  * @is_delete: True for @a &= ~@b, false for @a |= @b.
 319  *
 320  * Returns true if @a is empty, false otherwise.
 321  */
 322 static bool tomoyo_merge_path_acl(struct tomoyo_acl_info *a,
 323                                   struct tomoyo_acl_info *b,
 324                                   const bool is_delete)
 325 {
 326         u16 * const a_perm = &container_of(a, struct tomoyo_path_acl, head)
 327                 ->perm;
 328         u16 perm = *a_perm;
 329         const u16 b_perm = container_of(b, struct tomoyo_path_acl, head)->perm;
 330         if (is_delete)
 331                 perm &= ~b_perm;
 332         else
 333                 perm |= b_perm;
 334         *a_perm = perm;
 335         return !perm;
 336 }
 337
 338 /**
 339  * tomoyo_update_path_acl - Update "struct tomoyo_path_acl" list.
 340  *
 341  * @type:      Type of operation.
 342  * @filename:  Filename.
 343  * @domain:    Pointer to "struct tomoyo_domain_info".
 344  * @is_delete: True if it is a delete request.
 345  *
 346  * Returns 0 on success, negative value otherwise.
 347  *
 348  * Caller holds tomoyo_read_lock().
 349  */
 350 static int tomoyo_update_path_acl(const u8 type, const char *filename,
 351                                   struct tomoyo_domain_info * const domain,
 352                                   const bool is_delete)
 353 {
 354         struct tomoyo_path_acl e = {
 355                 .head.type = TOMOYO_TYPE_PATH_ACL,
 356                 .perm = 1 << type
 357         };
 358         int error;
 359         if (!tomoyo_parse_name_union(filename, &e.name))
 360                 return -EINVAL;
 361         error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain,
 362                                      tomoyo_same_path_acl,
 363                                      tomoyo_merge_path_acl);
 364         tomoyo_put_name_union(&e.name);
 365         return error;
 366 }
 367
 368 static bool tomoyo_same_mkdev_acl(const struct tomoyo_acl_info *a,
 369                                          const struct tomoyo_acl_info *b)
 370 {
 371         const struct tomoyo_mkdev_acl *p1 = container_of(a, typeof(*p1),
 372                                                                 head);
 373         const struct tomoyo_mkdev_acl *p2 = container_of(b, typeof(*p2),
 374                                                                 head);
 375         return tomoyo_same_acl_head(&p1->head, &p2->head)
 376                 && tomoyo_same_name_union(&p1->name, &p2->name)
 377                 && tomoyo_same_number_union(&p1->mode, &p2->mode)
 378                 && tomoyo_same_number_union(&p1->major, &p2->major)
 379                 && tomoyo_same_number_union(&p1->minor, &p2->minor);
 380 }
 381
 382 static bool tomoyo_merge_mkdev_acl(struct tomoyo_acl_info *a,
 383                                           struct tomoyo_acl_info *b,
 384                                           const bool is_delete)
 385 {
 386         u8 *const a_perm = &container_of(a, struct tomoyo_mkdev_acl,
 387                                          head)->perm;
 388         u8 perm = *a_perm;
 389         const u8 b_perm = container_of(b, struct tomoyo_mkdev_acl, head)
 390                 ->perm;
 391         if (is_delete)
 392                 perm &= ~b_perm;
 393         else
 394                 perm |= b_perm;
 395         *a_perm = perm;
 396         return !perm;
 397 }
 398
 399 /**
 400  * tomoyo_update_mkdev_acl - Update "struct tomoyo_mkdev_acl" list.
 401  *
 402  * @type:      Type of operation.
 403  * @filename:  Filename.
 404  * @mode:      Create mode.
 405  * @major:     Device major number.
 406  * @minor:     Device minor number.
 407  * @domain:    Pointer to "struct tomoyo_domain_info".
 408  * @is_delete: True if it is a delete request.
 409  *
 410  * Returns 0 on success, negative value otherwise.
 411  *
 412  * Caller holds tomoyo_read_lock().
 413  */
 414 static int tomoyo_update_mkdev_acl(const u8 type, const char *filename,
 415                                           char *mode, char *major, char *minor,
 416                                           struct tomoyo_domain_info * const
 417                                           domain, const bool is_delete)
 418 {
 419         struct tomoyo_mkdev_acl e = {
 420                 .head.type = TOMOYO_TYPE_MKDEV_ACL,
 421                 .perm = 1 << type
 422         };
 423         int error = is_delete ? -ENOENT : -ENOMEM;
 424         if (!tomoyo_parse_name_union(filename, &e.name) ||
 425             !tomoyo_parse_number_union(mode, &e.mode) ||
 426             !tomoyo_parse_number_union(major, &e.major) ||
 427             !tomoyo_parse_number_union(minor, &e.minor))
 428                 goto out;
 429         error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain,
 430                                      tomoyo_same_mkdev_acl,
 431                                      tomoyo_merge_mkdev_acl);
 432  out:
 433         tomoyo_put_name_union(&e.name);
 434         tomoyo_put_number_union(&e.mode);
 435         tomoyo_put_number_union(&e.major);
 436         tomoyo_put_number_union(&e.minor);
 437         return error;
 438 }
 439
 440 static bool tomoyo_same_path2_acl(const struct tomoyo_acl_info *a,
 441                                   const struct tomoyo_acl_info *b)
 442 {
 443         const struct tomoyo_path2_acl *p1 = container_of(a, typeof(*p1), head);
 444         const struct tomoyo_path2_acl *p2 = container_of(b, typeof(*p2), head);
 445         return tomoyo_same_acl_head(&p1->head, &p2->head)
 446                 && tomoyo_same_name_union(&p1->name1, &p2->name1)
 447                 && tomoyo_same_name_union(&p1->name2, &p2->name2);
 448 }
 449
 450 static bool tomoyo_merge_path2_acl(struct tomoyo_acl_info *a,
 451                                    struct tomoyo_acl_info *b,
 452                                    const bool is_delete)
 453 {
 454         u8 * const a_perm = &container_of(a, struct tomoyo_path2_acl, head)
 455                 ->perm;
 456         u8 perm = *a_perm;
 457         const u8 b_perm = container_of(b, struct tomoyo_path2_acl, head)->perm;
 458         if (is_delete)
 459                 perm &= ~b_perm;
 460         else
 461                 perm |= b_perm;
 462         *a_perm = perm;
 463         return !perm;
 464 }
 465
 466 /**
 467  * tomoyo_update_path2_acl - Update "struct tomoyo_path2_acl" list.
 468  *
 469  * @type:      Type of operation.
 470  * @filename1: First filename.
 471  * @filename2: Second filename.
 472  * @domain:    Pointer to "struct tomoyo_domain_info".
 473  * @is_delete: True if it is a delete request.
 474  *
 475  * Returns 0 on success, negative value otherwise.
 476  *
 477  * Caller holds tomoyo_read_lock().
 478  */
 479 static int tomoyo_update_path2_acl(const u8 type, const char *filename1,
 480                                    const char *filename2,
 481                                    struct tomoyo_domain_info * const domain,
 482                                    const bool is_delete)
 483 {
 484         struct tomoyo_path2_acl e = {
 485                 .head.type = TOMOYO_TYPE_PATH2_ACL,
 486                 .perm = 1 << type
 487         };
 488         int error = is_delete ? -ENOENT : -ENOMEM;
 489         if (!tomoyo_parse_name_union(filename1, &e.name1) ||
 490             !tomoyo_parse_name_union(filename2, &e.name2))
 491                 goto out;
 492         error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain,
 493                                      tomoyo_same_path2_acl,
 494                                      tomoyo_merge_path2_acl);
 495  out:
 496         tomoyo_put_name_union(&e.name1);
 497         tomoyo_put_name_union(&e.name2);
 498         return error;
 499 }
 500
 501 /**
 502  * tomoyo_path_permission - Check permission for single path operation.
 503  *
 504  * @r:         Pointer to "struct tomoyo_request_info".
 505  * @operation: Type of operation.
 506  * @filename:  Filename to check.
 507  *
 508  * Returns 0 on success, negative value otherwise.
 509  *
 510  * Caller holds tomoyo_read_lock().
 511  */
 512 int tomoyo_path_permission(struct tomoyo_request_info *r, u8 operation,
 513                            const struct tomoyo_path_info *filename)
 514 {
 515         int error;
 516
 517         r->type = tomoyo_p2mac[operation];
 518         r->mode = tomoyo_get_mode(r->profile, r->type);
 519         if (r->mode == TOMOYO_CONFIG_DISABLED)
 520                 return 0;
 521         r->param_type = TOMOYO_TYPE_PATH_ACL;
 522         r->param.path.filename = filename;
 523         r->param.path.operation = operation;
 524         do {
 525                 tomoyo_check_acl(r, tomoyo_check_path_acl);
 526                 error = tomoyo_audit_path_log(r);
 527                 /*
 528                  * Do not retry for execute request, for alias may have
 529                  * changed.
 530                  */
 531         } while (error == TOMOYO_RETRY_REQUEST &&
 532                  operation != TOMOYO_TYPE_EXECUTE);
 533         return error;
 534 }
 535
 536 static bool tomoyo_same_path_number_acl(const struct tomoyo_acl_info *a,
 537                                         const struct tomoyo_acl_info *b)
 538 {
 539         const struct tomoyo_path_number_acl *p1 = container_of(a, typeof(*p1),
 540                                                                head);
 541         const struct tomoyo_path_number_acl *p2 = container_of(b, typeof(*p2),
 542                                                                head);
 543         return tomoyo_same_acl_head(&p1->head, &p2->head)
 544                 && tomoyo_same_name_union(&p1->name, &p2->name)
 545                 && tomoyo_same_number_union(&p1->number, &p2->number);
 546 }
 547
 548 static bool tomoyo_merge_path_number_acl(struct tomoyo_acl_info *a,
 549                                          struct tomoyo_acl_info *b,
 550                                          const bool is_delete)
 551 {
 552         u8 * const a_perm = &container_of(a, struct tomoyo_path_number_acl,
 553                                           head)->perm;
 554         u8 perm = *a_perm;
 555         const u8 b_perm = container_of(b, struct tomoyo_path_number_acl, head)
 556                 ->perm;
 557         if (is_delete)
 558                 perm &= ~b_perm;
 559         else
 560                 perm |= b_perm;
 561         *a_perm = perm;
 562         return !perm;
 563 }
 564
 565 /**
 566  * tomoyo_update_path_number_acl - Update ioctl/chmod/chown/chgrp ACL.
 567  *
 568  * @type:      Type of operation.
 569  * @filename:  Filename.
 570  * @number:    Number.
 571  * @domain:    Pointer to "struct tomoyo_domain_info".
 572  * @is_delete: True if it is a delete request.
 573  *
 574  * Returns 0 on success, negative value otherwise.
 575  */
 576 static int tomoyo_update_path_number_acl(const u8 type, const char *filename,
 577                                          char *number,
 578                                          struct tomoyo_domain_info * const
 579                                          domain,
 580                                          const bool is_delete)
 581 {
 582         struct tomoyo_path_number_acl e = {
 583                 .head.type = TOMOYO_TYPE_PATH_NUMBER_ACL,
 584                 .perm = 1 << type
 585         };
 586         int error = is_delete ? -ENOENT : -ENOMEM;
 587         if (!tomoyo_parse_name_union(filename, &e.name))
 588                 return -EINVAL;
 589         if (!tomoyo_parse_number_union(number, &e.number))
 590                 goto out;
 591         error = tomoyo_update_domain(&e.head, sizeof(e), is_delete, domain,
 592                                      tomoyo_same_path_number_acl,
 593                                      tomoyo_merge_path_number_acl);
 594  out:
 595         tomoyo_put_name_union(&e.name);
 596         tomoyo_put_number_union(&e.number);
 597         return error;
 598 }
 599
 600 /**
 601  * tomoyo_path_number_perm - Check permission for "create", "mkdir", "mkfifo", "mksock", "ioctl", "chmod", "chown", "chgrp".
 602  *
 603  * @type:   Type of operation.
 604  * @path:   Pointer to "struct path".
 605  * @number: Number.
 606  *
 607  * Returns 0 on success, negative value otherwise.
 608  */
 609 int tomoyo_path_number_perm(const u8 type, struct path *path,
 610                             unsigned long number)
 611 {
 612         struct tomoyo_request_info r;
 613         int error = -ENOMEM;
 614         struct tomoyo_path_info buf;
 615         int idx;
 616
 617         if (tomoyo_init_request_info(&r, NULL, tomoyo_pn2mac[type])
 618             == TOMOYO_CONFIG_DISABLED || !path->mnt || !path->dentry)
 619                 return 0;
 620         idx = tomoyo_read_lock();
 621         if (!tomoyo_get_realpath(&buf, path))
 622                 goto out;
 623         if (type == TOMOYO_TYPE_MKDIR)
 624                 tomoyo_add_slash(&buf);
 625         r.param_type = TOMOYO_TYPE_PATH_NUMBER_ACL;
 626         r.param.path_number.operation = type;
 627         r.param.path_number.filename = &buf;
 628         r.param.path_number.number = number;
 629         do {
 630                 tomoyo_check_acl(&r, tomoyo_check_path_number_acl);
 631                 error = tomoyo_audit_path_number_log(&r);
 632         } while (error == TOMOYO_RETRY_REQUEST);
 633         kfree(buf.name);
 634  out:
 635         tomoyo_read_unlock(idx);
 636         if (r.mode != TOMOYO_CONFIG_ENFORCING)
 637                 error = 0;
 638         return error;
 639 }
 640
 641 /**
 642  * tomoyo_check_open_permission - Check permission for "read" and "write".
 643  *
 644  * @domain: Pointer to "struct tomoyo_domain_info".
 645  * @path:   Pointer to "struct path".
 646  * @flag:   Flags for open().
 647  *
 648  * Returns 0 on success, negative value otherwise.
 649  */
 650 int tomoyo_check_open_permission(struct tomoyo_domain_info *domain,
 651                                  struct path *path, const int flag)
 652 {
 653         const u8 acc_mode = ACC_MODE(flag);
 654         int error = 0;
 655         struct tomoyo_path_info buf;
 656         struct tomoyo_request_info r;
 657         int idx;
 658
 659         if (!path->mnt)
 660                 return 0;
 661         buf.name = NULL;
 662         r.mode = TOMOYO_CONFIG_DISABLED;
 663         idx = tomoyo_read_lock();
 664         if (acc_mode &&
 665             tomoyo_init_request_info(&r, domain, TOMOYO_MAC_FILE_OPEN)
 666             != TOMOYO_CONFIG_DISABLED) {
 667                 if (!tomoyo_get_realpath(&buf, path)) {
 668                         error = -ENOMEM;
 669                         goto out;
 670                 }
 671                 if (acc_mode & MAY_READ)
 672                         error = tomoyo_path_permission(&r, TOMOYO_TYPE_READ,
 673                                                        &buf);
 674                 if (!error && (acc_mode & MAY_WRITE))
 675                         error = tomoyo_path_permission(&r, (flag & O_APPEND) ?
 676                                                        TOMOYO_TYPE_APPEND :
 677                                                        TOMOYO_TYPE_WRITE,
 678                                                        &buf);
 679         }
 680  out:
 681         kfree(buf.name);
 682         tomoyo_read_unlock(idx);
 683         if (r.mode != TOMOYO_CONFIG_ENFORCING)
 684                 error = 0;
 685         return error;
 686 }
 687
 688 /**
 689  * tomoyo_path_perm - Check permission for "unlink", "rmdir", "truncate", "symlink", "append", "chroot" and "unmount".
 690  *
 691  * @operation: Type of operation.
 692  * @path:      Pointer to "struct path".
 693  *
 694  * Returns 0 on success, negative value otherwise.
 695  */
 696 int tomoyo_path_perm(const u8 operation, struct path *path)
 697 {
 698         struct tomoyo_request_info r;
 699         int error;
 700         struct tomoyo_path_info buf;
 701         bool is_enforce;
 702         int idx;
 703
 704         if (!path->mnt)
 705                 return 0;
 706         if (tomoyo_init_request_info(&r, NULL, tomoyo_p2mac[operation])
 707             == TOMOYO_CONFIG_DISABLED)
 708                 return 0;
 709         is_enforce = (r.mode == TOMOYO_CONFIG_ENFORCING);
 710         error = -ENOMEM;
 711         buf.name = NULL;
 712         idx = tomoyo_read_lock();
 713         if (!tomoyo_get_realpath(&buf, path))
 714                 goto out;
 715         switch (operation) {
 716         case TOMOYO_TYPE_RMDIR:
 717         case TOMOYO_TYPE_CHROOT:
 718                 tomoyo_add_slash(&buf);
 719                 break;
 720         }
 721         error = tomoyo_path_permission(&r, operation, &buf);
 722  out:
 723         kfree(buf.name);
 724         tomoyo_read_unlock(idx);
 725         if (!is_enforce)
 726                 error = 0;
 727         return error;
 728 }
 729
 730 /**
 731  * tomoyo_mkdev_perm - Check permission for "mkblock" and "mkchar".
 732  *
 733  * @operation: Type of operation. (TOMOYO_TYPE_MKCHAR or TOMOYO_TYPE_MKBLOCK)
 734  * @path:      Pointer to "struct path".
 735  * @mode:      Create mode.
 736  * @dev:       Device number.
 737  *
 738  * Returns 0 on success, negative value otherwise.
 739  */
 740 int tomoyo_mkdev_perm(const u8 operation, struct path *path,
 741                              const unsigned int mode, unsigned int dev)
 742 {
 743         struct tomoyo_request_info r;
 744         int error = -ENOMEM;
 745         struct tomoyo_path_info buf;
 746         int idx;
 747
 748         if (!path->mnt ||
 749             tomoyo_init_request_info(&r, NULL, tomoyo_pnnn2mac[operation])
 750             == TOMOYO_CONFIG_DISABLED)
 751                 return 0;
 752         idx = tomoyo_read_lock();
 753         error = -ENOMEM;
 754         if (tomoyo_get_realpath(&buf, path)) {
 755                 dev = new_decode_dev(dev);
 756                 r.param_type = TOMOYO_TYPE_MKDEV_ACL;
 757                 r.param.mkdev.filename = &buf;
 758                 r.param.mkdev.operation = operation;
 759                 r.param.mkdev.mode = mode;
 760                 r.param.mkdev.major = MAJOR(dev);
 761                 r.param.mkdev.minor = MINOR(dev);
 762                 tomoyo_check_acl(&r, tomoyo_check_mkdev_acl);
 763                 error = tomoyo_audit_mkdev_log(&r);
 764                 kfree(buf.name);
 765         }
 766         tomoyo_read_unlock(idx);
 767         if (r.mode != TOMOYO_CONFIG_ENFORCING)
 768                 error = 0;
 769         return error;
 770 }
 771
 772 /**
 773  * tomoyo_path2_perm - Check permission for "rename", "link" and "pivot_root".
 774  *
 775  * @operation: Type of operation.
 776  * @path1:      Pointer to "struct path".
 777  * @path2:      Pointer to "struct path".
 778  *
 779  * Returns 0 on success, negative value otherwise.
 780  */
 781 int tomoyo_path2_perm(const u8 operation, struct path *path1,
 782                       struct path *path2)
 783 {
 784         int error = -ENOMEM;
 785         struct tomoyo_path_info buf1;
 786         struct tomoyo_path_info buf2;
 787         struct tomoyo_request_info r;
 788         int idx;
 789
 790         if (!path1->mnt || !path2->mnt ||
 791             tomoyo_init_request_info(&r, NULL, tomoyo_pp2mac[operation])
 792             == TOMOYO_CONFIG_DISABLED)
 793                 return 0;
 794         buf1.name = NULL;
 795         buf2.name = NULL;
 796         idx = tomoyo_read_lock();
 797         if (!tomoyo_get_realpath(&buf1, path1) ||
 798             !tomoyo_get_realpath(&buf2, path2))
 799                 goto out;
 800         switch (operation) {
 801                 struct dentry *dentry;
 802         case TOMOYO_TYPE_RENAME:
 803         case TOMOYO_TYPE_LINK:
 804                 dentry = path1->dentry;
 805                 if (!dentry->d_inode || !S_ISDIR(dentry->d_inode->i_mode))
 806                         break;
 807                 /* fall through */
 808         case TOMOYO_TYPE_PIVOT_ROOT:
 809                 tomoyo_add_slash(&buf1);
 810                 tomoyo_add_slash(&buf2);
 811                 break;
 812         }
 813         r.param_type = TOMOYO_TYPE_PATH2_ACL;
 814         r.param.path2.operation = operation;
 815         r.param.path2.filename1 = &buf1;
 816         r.param.path2.filename2 = &buf2;
 817         do {
 818                 tomoyo_check_acl(&r, tomoyo_check_path2_acl);
 819                 error = tomoyo_audit_path2_log(&r);
 820         } while (error == TOMOYO_RETRY_REQUEST);
 821  out:
 822         kfree(buf1.name);
 823         kfree(buf2.name);
 824         tomoyo_read_unlock(idx);
 825         if (r.mode != TOMOYO_CONFIG_ENFORCING)
 826                 error = 0;
 827         return error;
 828 }
 829
 830 /**
 831  * tomoyo_write_file - Update file related list.
 832  *
 833  * @data:      String to parse.
 834  * @domain:    Pointer to "struct tomoyo_domain_info".
 835  * @is_delete: True if it is a delete request.
 836  *
 837  * Returns 0 on success, negative value otherwise.
 838  *
 839  * Caller holds tomoyo_read_lock().
 840  */
 841 int tomoyo_write_file(char *data, struct tomoyo_domain_info *domain,
 842                       const bool is_delete)
 843 {
 844         char *w[5];
 845         u8 type;
 846         if (!tomoyo_tokenize(data, w, sizeof(w)) || !w[1][0])
 847                 return -EINVAL;
 848         if (strncmp(w[0], "allow_", 6))
 849                 goto out;
 850         w[0] += 6;
 851         for (type = 0; type < TOMOYO_MAX_PATH_OPERATION; type++) {
 852                 if (strcmp(w[0], tomoyo_path_keyword[type]))
 853                         continue;
 854                 return tomoyo_update_path_acl(type, w[1], domain, is_delete);
 855         }
 856         if (!w[2][0])
 857                 goto out;
 858         for (type = 0; type < TOMOYO_MAX_PATH2_OPERATION; type++) {
 859                 if (strcmp(w[0], tomoyo_path2_keyword[type]))
 860                         continue;
 861                 return tomoyo_update_path2_acl(type, w[1], w[2], domain,
 862                                                is_delete);
 863         }
 864         for (type = 0; type < TOMOYO_MAX_PATH_NUMBER_OPERATION; type++) {
 865                 if (strcmp(w[0], tomoyo_path_number_keyword[type]))
 866                         continue;
 867                 return tomoyo_update_path_number_acl(type, w[1], w[2], domain,
 868                                                      is_delete);
 869         }
 870         if (!w[3][0] || !w[4][0])
 871                 goto out;
 872         for (type = 0; type < TOMOYO_MAX_MKDEV_OPERATION; type++) {
 873                 if (strcmp(w[0], tomoyo_mkdev_keyword[type]))
 874                         continue;
 875                 return tomoyo_update_mkdev_acl(type, w[1], w[2], w[3],
 876                                                w[4], domain, is_delete);
 877         }
 878  out:
 879         return -EINVAL;
 880 }