1b69a54eeSKentaro Takeda /* 2b69a54eeSKentaro Takeda * security/tomoyo/file.c 3b69a54eeSKentaro Takeda * 4b69a54eeSKentaro Takeda * Implementation of the Domain-Based Mandatory Access Control. 5b69a54eeSKentaro Takeda * 6b69a54eeSKentaro Takeda * Copyright (C) 2005-2009 NTT DATA CORPORATION 7b69a54eeSKentaro Takeda * 839826a1eSTetsuo Handa * Version: 2.2.0 2009/04/01 9b69a54eeSKentaro Takeda * 10b69a54eeSKentaro Takeda */ 11b69a54eeSKentaro Takeda 12b69a54eeSKentaro Takeda #include "common.h" 13b69a54eeSKentaro Takeda #include "tomoyo.h" 14b69a54eeSKentaro Takeda #include "realpath.h" 15b69a54eeSKentaro Takeda 16c3fa109aSTetsuo Handa /* 17c3fa109aSTetsuo Handa * tomoyo_globally_readable_file_entry is a structure which is used for holding 18c3fa109aSTetsuo Handa * "allow_read" entries. 19c3fa109aSTetsuo Handa * It has following fields. 20c3fa109aSTetsuo Handa * 21c3fa109aSTetsuo Handa * (1) "list" which is linked to tomoyo_globally_readable_list . 22c3fa109aSTetsuo Handa * (2) "filename" is a pathname which is allowed to open(O_RDONLY). 23c3fa109aSTetsuo Handa * (3) "is_deleted" is a bool which is true if marked as deleted, false 24c3fa109aSTetsuo Handa * otherwise. 25c3fa109aSTetsuo Handa */ 26b69a54eeSKentaro Takeda struct tomoyo_globally_readable_file_entry { 27b69a54eeSKentaro Takeda struct list_head list; 28b69a54eeSKentaro Takeda const struct tomoyo_path_info *filename; 29b69a54eeSKentaro Takeda bool is_deleted; 30b69a54eeSKentaro Takeda }; 31b69a54eeSKentaro Takeda 32c3fa109aSTetsuo Handa /* 33c3fa109aSTetsuo Handa * tomoyo_pattern_entry is a structure which is used for holding 34c3fa109aSTetsuo Handa * "tomoyo_pattern_list" entries. 35c3fa109aSTetsuo Handa * It has following fields. 36c3fa109aSTetsuo Handa * 37c3fa109aSTetsuo Handa * (1) "list" which is linked to tomoyo_pattern_list . 38c3fa109aSTetsuo Handa * (2) "pattern" is a pathname pattern which is used for converting pathnames 39c3fa109aSTetsuo Handa * to pathname patterns during learning mode. 40c3fa109aSTetsuo Handa * (3) "is_deleted" is a bool which is true if marked as deleted, false 41c3fa109aSTetsuo Handa * otherwise. 42c3fa109aSTetsuo Handa */ 43b69a54eeSKentaro Takeda struct tomoyo_pattern_entry { 44b69a54eeSKentaro Takeda struct list_head list; 45b69a54eeSKentaro Takeda const struct tomoyo_path_info *pattern; 46b69a54eeSKentaro Takeda bool is_deleted; 47b69a54eeSKentaro Takeda }; 48b69a54eeSKentaro Takeda 49c3fa109aSTetsuo Handa /* 50c3fa109aSTetsuo Handa * tomoyo_no_rewrite_entry is a structure which is used for holding 51c3fa109aSTetsuo Handa * "deny_rewrite" entries. 52c3fa109aSTetsuo Handa * It has following fields. 53c3fa109aSTetsuo Handa * 54c3fa109aSTetsuo Handa * (1) "list" which is linked to tomoyo_no_rewrite_list . 55c3fa109aSTetsuo Handa * (2) "pattern" is a pathname which is by default not permitted to modify 56c3fa109aSTetsuo Handa * already existing content. 57c3fa109aSTetsuo Handa * (3) "is_deleted" is a bool which is true if marked as deleted, false 58c3fa109aSTetsuo Handa * otherwise. 59c3fa109aSTetsuo Handa */ 60b69a54eeSKentaro Takeda struct tomoyo_no_rewrite_entry { 61b69a54eeSKentaro Takeda struct list_head list; 62b69a54eeSKentaro Takeda const struct tomoyo_path_info *pattern; 63b69a54eeSKentaro Takeda bool is_deleted; 64b69a54eeSKentaro Takeda }; 65b69a54eeSKentaro Takeda 66b69a54eeSKentaro Takeda /* Keyword array for single path operations. */ 67b69a54eeSKentaro Takeda static const char *tomoyo_sp_keyword[TOMOYO_MAX_SINGLE_PATH_OPERATION] = { 68b69a54eeSKentaro Takeda [TOMOYO_TYPE_READ_WRITE_ACL] = "read/write", 69b69a54eeSKentaro Takeda [TOMOYO_TYPE_EXECUTE_ACL] = "execute", 70b69a54eeSKentaro Takeda [TOMOYO_TYPE_READ_ACL] = "read", 71b69a54eeSKentaro Takeda [TOMOYO_TYPE_WRITE_ACL] = "write", 72b69a54eeSKentaro Takeda [TOMOYO_TYPE_CREATE_ACL] = "create", 73b69a54eeSKentaro Takeda [TOMOYO_TYPE_UNLINK_ACL] = "unlink", 74b69a54eeSKentaro Takeda [TOMOYO_TYPE_MKDIR_ACL] = "mkdir", 75b69a54eeSKentaro Takeda [TOMOYO_TYPE_RMDIR_ACL] = "rmdir", 76b69a54eeSKentaro Takeda [TOMOYO_TYPE_MKFIFO_ACL] = "mkfifo", 77b69a54eeSKentaro Takeda [TOMOYO_TYPE_MKSOCK_ACL] = "mksock", 78b69a54eeSKentaro Takeda [TOMOYO_TYPE_MKBLOCK_ACL] = "mkblock", 79b69a54eeSKentaro Takeda [TOMOYO_TYPE_MKCHAR_ACL] = "mkchar", 80b69a54eeSKentaro Takeda [TOMOYO_TYPE_TRUNCATE_ACL] = "truncate", 81b69a54eeSKentaro Takeda [TOMOYO_TYPE_SYMLINK_ACL] = "symlink", 82b69a54eeSKentaro Takeda [TOMOYO_TYPE_REWRITE_ACL] = "rewrite", 83937bf613STetsuo Handa [TOMOYO_TYPE_IOCTL_ACL] = "ioctl", 84937bf613STetsuo Handa [TOMOYO_TYPE_CHMOD_ACL] = "chmod", 85937bf613STetsuo Handa [TOMOYO_TYPE_CHOWN_ACL] = "chown", 86937bf613STetsuo Handa [TOMOYO_TYPE_CHGRP_ACL] = "chgrp", 87937bf613STetsuo Handa [TOMOYO_TYPE_CHROOT_ACL] = "chroot", 88937bf613STetsuo Handa [TOMOYO_TYPE_MOUNT_ACL] = "mount", 89937bf613STetsuo Handa [TOMOYO_TYPE_UMOUNT_ACL] = "unmount", 90b69a54eeSKentaro Takeda }; 91b69a54eeSKentaro Takeda 92b69a54eeSKentaro Takeda /* Keyword array for double path operations. */ 93b69a54eeSKentaro Takeda static const char *tomoyo_dp_keyword[TOMOYO_MAX_DOUBLE_PATH_OPERATION] = { 94b69a54eeSKentaro Takeda [TOMOYO_TYPE_LINK_ACL] = "link", 95b69a54eeSKentaro Takeda [TOMOYO_TYPE_RENAME_ACL] = "rename", 96937bf613STetsuo Handa [TOMOYO_TYPE_PIVOT_ROOT_ACL] = "pivot_root", 97b69a54eeSKentaro Takeda }; 98b69a54eeSKentaro Takeda 99b69a54eeSKentaro Takeda /** 100b69a54eeSKentaro Takeda * tomoyo_sp2keyword - Get the name of single path operation. 101b69a54eeSKentaro Takeda * 102b69a54eeSKentaro Takeda * @operation: Type of operation. 103b69a54eeSKentaro Takeda * 104b69a54eeSKentaro Takeda * Returns the name of single path operation. 105b69a54eeSKentaro Takeda */ 106b69a54eeSKentaro Takeda const char *tomoyo_sp2keyword(const u8 operation) 107b69a54eeSKentaro Takeda { 108b69a54eeSKentaro Takeda return (operation < TOMOYO_MAX_SINGLE_PATH_OPERATION) 109b69a54eeSKentaro Takeda ? tomoyo_sp_keyword[operation] : NULL; 110b69a54eeSKentaro Takeda } 111b69a54eeSKentaro Takeda 112b69a54eeSKentaro Takeda /** 113b69a54eeSKentaro Takeda * tomoyo_dp2keyword - Get the name of double path operation. 114b69a54eeSKentaro Takeda * 115b69a54eeSKentaro Takeda * @operation: Type of operation. 116b69a54eeSKentaro Takeda * 117b69a54eeSKentaro Takeda * Returns the name of double path operation. 118b69a54eeSKentaro Takeda */ 119b69a54eeSKentaro Takeda const char *tomoyo_dp2keyword(const u8 operation) 120b69a54eeSKentaro Takeda { 121b69a54eeSKentaro Takeda return (operation < TOMOYO_MAX_DOUBLE_PATH_OPERATION) 122b69a54eeSKentaro Takeda ? tomoyo_dp_keyword[operation] : NULL; 123b69a54eeSKentaro Takeda } 124b69a54eeSKentaro Takeda 125b69a54eeSKentaro Takeda /** 126b69a54eeSKentaro Takeda * tomoyo_strendswith - Check whether the token ends with the given token. 127b69a54eeSKentaro Takeda * 128b69a54eeSKentaro Takeda * @name: The token to check. 129b69a54eeSKentaro Takeda * @tail: The token to find. 130b69a54eeSKentaro Takeda * 131b69a54eeSKentaro Takeda * Returns true if @name ends with @tail, false otherwise. 132b69a54eeSKentaro Takeda */ 133b69a54eeSKentaro Takeda static bool tomoyo_strendswith(const char *name, const char *tail) 134b69a54eeSKentaro Takeda { 135b69a54eeSKentaro Takeda int len; 136b69a54eeSKentaro Takeda 137b69a54eeSKentaro Takeda if (!name || !tail) 138b69a54eeSKentaro Takeda return false; 139b69a54eeSKentaro Takeda len = strlen(name) - strlen(tail); 140b69a54eeSKentaro Takeda return len >= 0 && !strcmp(name + len, tail); 141b69a54eeSKentaro Takeda } 142b69a54eeSKentaro Takeda 143b69a54eeSKentaro Takeda /** 144b69a54eeSKentaro Takeda * tomoyo_get_path - Get realpath. 145b69a54eeSKentaro Takeda * 146b69a54eeSKentaro Takeda * @path: Pointer to "struct path". 147b69a54eeSKentaro Takeda * 148b69a54eeSKentaro Takeda * Returns pointer to "struct tomoyo_path_info" on success, NULL otherwise. 149b69a54eeSKentaro Takeda */ 150b69a54eeSKentaro Takeda static struct tomoyo_path_info *tomoyo_get_path(struct path *path) 151b69a54eeSKentaro Takeda { 152b69a54eeSKentaro Takeda int error; 1538e2d39a1STetsuo Handa struct tomoyo_path_info_with_data *buf = kzalloc(sizeof(*buf), 1548e2d39a1STetsuo Handa GFP_KERNEL); 155b69a54eeSKentaro Takeda 156b69a54eeSKentaro Takeda if (!buf) 157b69a54eeSKentaro Takeda return NULL; 158b69a54eeSKentaro Takeda /* Reserve one byte for appending "/". */ 159b69a54eeSKentaro Takeda error = tomoyo_realpath_from_path2(path, buf->body, 160b69a54eeSKentaro Takeda sizeof(buf->body) - 2); 161b69a54eeSKentaro Takeda if (!error) { 162b69a54eeSKentaro Takeda buf->head.name = buf->body; 163b69a54eeSKentaro Takeda tomoyo_fill_path_info(&buf->head); 164b69a54eeSKentaro Takeda return &buf->head; 165b69a54eeSKentaro Takeda } 1668e2d39a1STetsuo Handa kfree(buf); 167b69a54eeSKentaro Takeda return NULL; 168b69a54eeSKentaro Takeda } 169b69a54eeSKentaro Takeda 170b69a54eeSKentaro Takeda static int tomoyo_update_double_path_acl(const u8 type, const char *filename1, 171b69a54eeSKentaro Takeda const char *filename2, 172b69a54eeSKentaro Takeda struct tomoyo_domain_info * 173b69a54eeSKentaro Takeda const domain, const bool is_delete); 174b69a54eeSKentaro Takeda static int tomoyo_update_single_path_acl(const u8 type, const char *filename, 175b69a54eeSKentaro Takeda struct tomoyo_domain_info * 176b69a54eeSKentaro Takeda const domain, const bool is_delete); 177b69a54eeSKentaro Takeda 178c3fa109aSTetsuo Handa /* 179c3fa109aSTetsuo Handa * tomoyo_globally_readable_list is used for holding list of pathnames which 180c3fa109aSTetsuo Handa * are by default allowed to be open()ed for reading by any process. 181c3fa109aSTetsuo Handa * 182c3fa109aSTetsuo Handa * An entry is added by 183c3fa109aSTetsuo Handa * 184c3fa109aSTetsuo Handa * # echo 'allow_read /lib/libc-2.5.so' > \ 185c3fa109aSTetsuo Handa * /sys/kernel/security/tomoyo/exception_policy 186c3fa109aSTetsuo Handa * 187c3fa109aSTetsuo Handa * and is deleted by 188c3fa109aSTetsuo Handa * 189c3fa109aSTetsuo Handa * # echo 'delete allow_read /lib/libc-2.5.so' > \ 190c3fa109aSTetsuo Handa * /sys/kernel/security/tomoyo/exception_policy 191c3fa109aSTetsuo Handa * 192c3fa109aSTetsuo Handa * and all entries are retrieved by 193c3fa109aSTetsuo Handa * 194c3fa109aSTetsuo Handa * # grep ^allow_read /sys/kernel/security/tomoyo/exception_policy 195c3fa109aSTetsuo Handa * 196c3fa109aSTetsuo Handa * In the example above, any process is allowed to 197c3fa109aSTetsuo Handa * open("/lib/libc-2.5.so", O_RDONLY). 198c3fa109aSTetsuo Handa * One exception is, if the domain which current process belongs to is marked 199c3fa109aSTetsuo Handa * as "ignore_global_allow_read", current process can't do so unless explicitly 200c3fa109aSTetsuo Handa * given "allow_read /lib/libc-2.5.so" to the domain which current process 201c3fa109aSTetsuo Handa * belongs to. 202c3fa109aSTetsuo Handa */ 203b69a54eeSKentaro Takeda static LIST_HEAD(tomoyo_globally_readable_list); 204b69a54eeSKentaro Takeda 205b69a54eeSKentaro Takeda /** 206b69a54eeSKentaro Takeda * tomoyo_update_globally_readable_entry - Update "struct tomoyo_globally_readable_file_entry" list. 207b69a54eeSKentaro Takeda * 208b69a54eeSKentaro Takeda * @filename: Filename unconditionally permitted to open() for reading. 209b69a54eeSKentaro Takeda * @is_delete: True if it is a delete request. 210b69a54eeSKentaro Takeda * 211b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 212fdb8ebb7STetsuo Handa * 213fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 214b69a54eeSKentaro Takeda */ 215b69a54eeSKentaro Takeda static int tomoyo_update_globally_readable_entry(const char *filename, 216b69a54eeSKentaro Takeda const bool is_delete) 217b69a54eeSKentaro Takeda { 218ca0b7df3STetsuo Handa struct tomoyo_globally_readable_file_entry *entry = NULL; 219b69a54eeSKentaro Takeda struct tomoyo_globally_readable_file_entry *ptr; 220b69a54eeSKentaro Takeda const struct tomoyo_path_info *saved_filename; 221ca0b7df3STetsuo Handa int error = is_delete ? -ENOENT : -ENOMEM; 222b69a54eeSKentaro Takeda 223b69a54eeSKentaro Takeda if (!tomoyo_is_correct_path(filename, 1, 0, -1, __func__)) 224b69a54eeSKentaro Takeda return -EINVAL; 225bf24fb01STetsuo Handa saved_filename = tomoyo_get_name(filename); 226b69a54eeSKentaro Takeda if (!saved_filename) 227b69a54eeSKentaro Takeda return -ENOMEM; 228ca0b7df3STetsuo Handa if (!is_delete) 229ca0b7df3STetsuo Handa entry = kmalloc(sizeof(*entry), GFP_KERNEL); 230f737d95dSTetsuo Handa mutex_lock(&tomoyo_policy_lock); 231fdb8ebb7STetsuo Handa list_for_each_entry_rcu(ptr, &tomoyo_globally_readable_list, list) { 232b69a54eeSKentaro Takeda if (ptr->filename != saved_filename) 233b69a54eeSKentaro Takeda continue; 234b69a54eeSKentaro Takeda ptr->is_deleted = is_delete; 235b69a54eeSKentaro Takeda error = 0; 236ca0b7df3STetsuo Handa break; 237b69a54eeSKentaro Takeda } 238ca0b7df3STetsuo Handa if (!is_delete && error && tomoyo_memory_ok(entry)) { 239ca0b7df3STetsuo Handa entry->filename = saved_filename; 240bf24fb01STetsuo Handa saved_filename = NULL; 241ca0b7df3STetsuo Handa list_add_tail_rcu(&entry->list, &tomoyo_globally_readable_list); 242ca0b7df3STetsuo Handa entry = NULL; 243b69a54eeSKentaro Takeda error = 0; 244ca0b7df3STetsuo Handa } 245f737d95dSTetsuo Handa mutex_unlock(&tomoyo_policy_lock); 246bf24fb01STetsuo Handa tomoyo_put_name(saved_filename); 247ca0b7df3STetsuo Handa kfree(entry); 248b69a54eeSKentaro Takeda return error; 249b69a54eeSKentaro Takeda } 250b69a54eeSKentaro Takeda 251b69a54eeSKentaro Takeda /** 252b69a54eeSKentaro Takeda * tomoyo_is_globally_readable_file - Check if the file is unconditionnaly permitted to be open()ed for reading. 253b69a54eeSKentaro Takeda * 254b69a54eeSKentaro Takeda * @filename: The filename to check. 255b69a54eeSKentaro Takeda * 256b69a54eeSKentaro Takeda * Returns true if any domain can open @filename for reading, false otherwise. 257fdb8ebb7STetsuo Handa * 258fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 259b69a54eeSKentaro Takeda */ 260b69a54eeSKentaro Takeda static bool tomoyo_is_globally_readable_file(const struct tomoyo_path_info * 261b69a54eeSKentaro Takeda filename) 262b69a54eeSKentaro Takeda { 263b69a54eeSKentaro Takeda struct tomoyo_globally_readable_file_entry *ptr; 264b69a54eeSKentaro Takeda bool found = false; 265fdb8ebb7STetsuo Handa 266fdb8ebb7STetsuo Handa list_for_each_entry_rcu(ptr, &tomoyo_globally_readable_list, list) { 267b69a54eeSKentaro Takeda if (!ptr->is_deleted && 268b69a54eeSKentaro Takeda tomoyo_path_matches_pattern(filename, ptr->filename)) { 269b69a54eeSKentaro Takeda found = true; 270b69a54eeSKentaro Takeda break; 271b69a54eeSKentaro Takeda } 272b69a54eeSKentaro Takeda } 273b69a54eeSKentaro Takeda return found; 274b69a54eeSKentaro Takeda } 275b69a54eeSKentaro Takeda 276b69a54eeSKentaro Takeda /** 277b69a54eeSKentaro Takeda * tomoyo_write_globally_readable_policy - Write "struct tomoyo_globally_readable_file_entry" list. 278b69a54eeSKentaro Takeda * 279b69a54eeSKentaro Takeda * @data: String to parse. 280b69a54eeSKentaro Takeda * @is_delete: True if it is a delete request. 281b69a54eeSKentaro Takeda * 282b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 283fdb8ebb7STetsuo Handa * 284fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 285b69a54eeSKentaro Takeda */ 286b69a54eeSKentaro Takeda int tomoyo_write_globally_readable_policy(char *data, const bool is_delete) 287b69a54eeSKentaro Takeda { 288b69a54eeSKentaro Takeda return tomoyo_update_globally_readable_entry(data, is_delete); 289b69a54eeSKentaro Takeda } 290b69a54eeSKentaro Takeda 291b69a54eeSKentaro Takeda /** 292b69a54eeSKentaro Takeda * tomoyo_read_globally_readable_policy - Read "struct tomoyo_globally_readable_file_entry" list. 293b69a54eeSKentaro Takeda * 294b69a54eeSKentaro Takeda * @head: Pointer to "struct tomoyo_io_buffer". 295b69a54eeSKentaro Takeda * 296b69a54eeSKentaro Takeda * Returns true on success, false otherwise. 297fdb8ebb7STetsuo Handa * 298fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 299b69a54eeSKentaro Takeda */ 300b69a54eeSKentaro Takeda bool tomoyo_read_globally_readable_policy(struct tomoyo_io_buffer *head) 301b69a54eeSKentaro Takeda { 302b69a54eeSKentaro Takeda struct list_head *pos; 303b69a54eeSKentaro Takeda bool done = true; 304b69a54eeSKentaro Takeda 305b69a54eeSKentaro Takeda list_for_each_cookie(pos, head->read_var2, 306b69a54eeSKentaro Takeda &tomoyo_globally_readable_list) { 307b69a54eeSKentaro Takeda struct tomoyo_globally_readable_file_entry *ptr; 308b69a54eeSKentaro Takeda ptr = list_entry(pos, 309b69a54eeSKentaro Takeda struct tomoyo_globally_readable_file_entry, 310b69a54eeSKentaro Takeda list); 311b69a54eeSKentaro Takeda if (ptr->is_deleted) 312b69a54eeSKentaro Takeda continue; 3137d2948b1STetsuo Handa done = tomoyo_io_printf(head, TOMOYO_KEYWORD_ALLOW_READ "%s\n", 3147d2948b1STetsuo Handa ptr->filename->name); 3157d2948b1STetsuo Handa if (!done) 316b69a54eeSKentaro Takeda break; 317b69a54eeSKentaro Takeda } 318b69a54eeSKentaro Takeda return done; 319b69a54eeSKentaro Takeda } 320b69a54eeSKentaro Takeda 321c3fa109aSTetsuo Handa /* tomoyo_pattern_list is used for holding list of pathnames which are used for 322c3fa109aSTetsuo Handa * converting pathnames to pathname patterns during learning mode. 323c3fa109aSTetsuo Handa * 324c3fa109aSTetsuo Handa * An entry is added by 325c3fa109aSTetsuo Handa * 326c3fa109aSTetsuo Handa * # echo 'file_pattern /proc/\$/mounts' > \ 327c3fa109aSTetsuo Handa * /sys/kernel/security/tomoyo/exception_policy 328c3fa109aSTetsuo Handa * 329c3fa109aSTetsuo Handa * and is deleted by 330c3fa109aSTetsuo Handa * 331c3fa109aSTetsuo Handa * # echo 'delete file_pattern /proc/\$/mounts' > \ 332c3fa109aSTetsuo Handa * /sys/kernel/security/tomoyo/exception_policy 333c3fa109aSTetsuo Handa * 334c3fa109aSTetsuo Handa * and all entries are retrieved by 335c3fa109aSTetsuo Handa * 336c3fa109aSTetsuo Handa * # grep ^file_pattern /sys/kernel/security/tomoyo/exception_policy 337c3fa109aSTetsuo Handa * 338c3fa109aSTetsuo Handa * In the example above, if a process which belongs to a domain which is in 339c3fa109aSTetsuo Handa * learning mode requested open("/proc/1/mounts", O_RDONLY), 340c3fa109aSTetsuo Handa * "allow_read /proc/\$/mounts" is automatically added to the domain which that 341c3fa109aSTetsuo Handa * process belongs to. 342c3fa109aSTetsuo Handa * 343c3fa109aSTetsuo Handa * It is not a desirable behavior that we have to use /proc/\$/ instead of 344c3fa109aSTetsuo Handa * /proc/self/ when current process needs to access only current process's 345c3fa109aSTetsuo Handa * information. As of now, LSM version of TOMOYO is using __d_path() for 346c3fa109aSTetsuo Handa * calculating pathname. Non LSM version of TOMOYO is using its own function 347c3fa109aSTetsuo Handa * which pretends as if /proc/self/ is not a symlink; so that we can forbid 348c3fa109aSTetsuo Handa * current process from accessing other process's information. 349c3fa109aSTetsuo Handa */ 350b69a54eeSKentaro Takeda static LIST_HEAD(tomoyo_pattern_list); 351b69a54eeSKentaro Takeda 352b69a54eeSKentaro Takeda /** 353b69a54eeSKentaro Takeda * tomoyo_update_file_pattern_entry - Update "struct tomoyo_pattern_entry" list. 354b69a54eeSKentaro Takeda * 355b69a54eeSKentaro Takeda * @pattern: Pathname pattern. 356b69a54eeSKentaro Takeda * @is_delete: True if it is a delete request. 357b69a54eeSKentaro Takeda * 358b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 359fdb8ebb7STetsuo Handa * 360fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 361b69a54eeSKentaro Takeda */ 362b69a54eeSKentaro Takeda static int tomoyo_update_file_pattern_entry(const char *pattern, 363b69a54eeSKentaro Takeda const bool is_delete) 364b69a54eeSKentaro Takeda { 365ca0b7df3STetsuo Handa struct tomoyo_pattern_entry *entry = NULL; 366b69a54eeSKentaro Takeda struct tomoyo_pattern_entry *ptr; 367b69a54eeSKentaro Takeda const struct tomoyo_path_info *saved_pattern; 368ca0b7df3STetsuo Handa int error = is_delete ? -ENOENT : -ENOMEM; 369b69a54eeSKentaro Takeda 370bf24fb01STetsuo Handa saved_pattern = tomoyo_get_name(pattern); 371b69a54eeSKentaro Takeda if (!saved_pattern) 372ca0b7df3STetsuo Handa return error; 373ca0b7df3STetsuo Handa if (!saved_pattern->is_patterned) 374ca0b7df3STetsuo Handa goto out; 375ca0b7df3STetsuo Handa if (!is_delete) 376ca0b7df3STetsuo Handa entry = kmalloc(sizeof(*entry), GFP_KERNEL); 377f737d95dSTetsuo Handa mutex_lock(&tomoyo_policy_lock); 378fdb8ebb7STetsuo Handa list_for_each_entry_rcu(ptr, &tomoyo_pattern_list, list) { 379b69a54eeSKentaro Takeda if (saved_pattern != ptr->pattern) 380b69a54eeSKentaro Takeda continue; 381b69a54eeSKentaro Takeda ptr->is_deleted = is_delete; 382b69a54eeSKentaro Takeda error = 0; 383ca0b7df3STetsuo Handa break; 384b69a54eeSKentaro Takeda } 385ca0b7df3STetsuo Handa if (!is_delete && error && tomoyo_memory_ok(entry)) { 386ca0b7df3STetsuo Handa entry->pattern = saved_pattern; 387bf24fb01STetsuo Handa saved_pattern = NULL; 388ca0b7df3STetsuo Handa list_add_tail_rcu(&entry->list, &tomoyo_pattern_list); 389ca0b7df3STetsuo Handa entry = NULL; 390b69a54eeSKentaro Takeda error = 0; 391ca0b7df3STetsuo Handa } 392f737d95dSTetsuo Handa mutex_unlock(&tomoyo_policy_lock); 393ca0b7df3STetsuo Handa out: 394ca0b7df3STetsuo Handa kfree(entry); 395bf24fb01STetsuo Handa tomoyo_put_name(saved_pattern); 396b69a54eeSKentaro Takeda return error; 397b69a54eeSKentaro Takeda } 398b69a54eeSKentaro Takeda 399b69a54eeSKentaro Takeda /** 400b69a54eeSKentaro Takeda * tomoyo_get_file_pattern - Get patterned pathname. 401b69a54eeSKentaro Takeda * 402b69a54eeSKentaro Takeda * @filename: The filename to find patterned pathname. 403b69a54eeSKentaro Takeda * 404b69a54eeSKentaro Takeda * Returns pointer to pathname pattern if matched, @filename otherwise. 405fdb8ebb7STetsuo Handa * 406fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 407b69a54eeSKentaro Takeda */ 408b69a54eeSKentaro Takeda static const struct tomoyo_path_info * 409b69a54eeSKentaro Takeda tomoyo_get_file_pattern(const struct tomoyo_path_info *filename) 410b69a54eeSKentaro Takeda { 411b69a54eeSKentaro Takeda struct tomoyo_pattern_entry *ptr; 412b69a54eeSKentaro Takeda const struct tomoyo_path_info *pattern = NULL; 413b69a54eeSKentaro Takeda 414fdb8ebb7STetsuo Handa list_for_each_entry_rcu(ptr, &tomoyo_pattern_list, list) { 415b69a54eeSKentaro Takeda if (ptr->is_deleted) 416b69a54eeSKentaro Takeda continue; 417b69a54eeSKentaro Takeda if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) 418b69a54eeSKentaro Takeda continue; 419b69a54eeSKentaro Takeda pattern = ptr->pattern; 420b69a54eeSKentaro Takeda if (tomoyo_strendswith(pattern->name, "/\\*")) { 421b69a54eeSKentaro Takeda /* Do nothing. Try to find the better match. */ 422b69a54eeSKentaro Takeda } else { 423b69a54eeSKentaro Takeda /* This would be the better match. Use this. */ 424b69a54eeSKentaro Takeda break; 425b69a54eeSKentaro Takeda } 426b69a54eeSKentaro Takeda } 427b69a54eeSKentaro Takeda if (pattern) 428b69a54eeSKentaro Takeda filename = pattern; 429b69a54eeSKentaro Takeda return filename; 430b69a54eeSKentaro Takeda } 431b69a54eeSKentaro Takeda 432b69a54eeSKentaro Takeda /** 433b69a54eeSKentaro Takeda * tomoyo_write_pattern_policy - Write "struct tomoyo_pattern_entry" list. 434b69a54eeSKentaro Takeda * 435b69a54eeSKentaro Takeda * @data: String to parse. 436b69a54eeSKentaro Takeda * @is_delete: True if it is a delete request. 437b69a54eeSKentaro Takeda * 438b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 439fdb8ebb7STetsuo Handa * 440fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 441b69a54eeSKentaro Takeda */ 442b69a54eeSKentaro Takeda int tomoyo_write_pattern_policy(char *data, const bool is_delete) 443b69a54eeSKentaro Takeda { 444b69a54eeSKentaro Takeda return tomoyo_update_file_pattern_entry(data, is_delete); 445b69a54eeSKentaro Takeda } 446b69a54eeSKentaro Takeda 447b69a54eeSKentaro Takeda /** 448b69a54eeSKentaro Takeda * tomoyo_read_file_pattern - Read "struct tomoyo_pattern_entry" list. 449b69a54eeSKentaro Takeda * 450b69a54eeSKentaro Takeda * @head: Pointer to "struct tomoyo_io_buffer". 451b69a54eeSKentaro Takeda * 452b69a54eeSKentaro Takeda * Returns true on success, false otherwise. 453fdb8ebb7STetsuo Handa * 454fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 455b69a54eeSKentaro Takeda */ 456b69a54eeSKentaro Takeda bool tomoyo_read_file_pattern(struct tomoyo_io_buffer *head) 457b69a54eeSKentaro Takeda { 458b69a54eeSKentaro Takeda struct list_head *pos; 459b69a54eeSKentaro Takeda bool done = true; 460b69a54eeSKentaro Takeda 461b69a54eeSKentaro Takeda list_for_each_cookie(pos, head->read_var2, &tomoyo_pattern_list) { 462b69a54eeSKentaro Takeda struct tomoyo_pattern_entry *ptr; 463b69a54eeSKentaro Takeda ptr = list_entry(pos, struct tomoyo_pattern_entry, list); 464b69a54eeSKentaro Takeda if (ptr->is_deleted) 465b69a54eeSKentaro Takeda continue; 4667d2948b1STetsuo Handa done = tomoyo_io_printf(head, TOMOYO_KEYWORD_FILE_PATTERN 4677d2948b1STetsuo Handa "%s\n", ptr->pattern->name); 4687d2948b1STetsuo Handa if (!done) 469b69a54eeSKentaro Takeda break; 470b69a54eeSKentaro Takeda } 471b69a54eeSKentaro Takeda return done; 472b69a54eeSKentaro Takeda } 473b69a54eeSKentaro Takeda 474c3fa109aSTetsuo Handa /* 475c3fa109aSTetsuo Handa * tomoyo_no_rewrite_list is used for holding list of pathnames which are by 476c3fa109aSTetsuo Handa * default forbidden to modify already written content of a file. 477c3fa109aSTetsuo Handa * 478c3fa109aSTetsuo Handa * An entry is added by 479c3fa109aSTetsuo Handa * 480c3fa109aSTetsuo Handa * # echo 'deny_rewrite /var/log/messages' > \ 481c3fa109aSTetsuo Handa * /sys/kernel/security/tomoyo/exception_policy 482c3fa109aSTetsuo Handa * 483c3fa109aSTetsuo Handa * and is deleted by 484c3fa109aSTetsuo Handa * 485c3fa109aSTetsuo Handa * # echo 'delete deny_rewrite /var/log/messages' > \ 486c3fa109aSTetsuo Handa * /sys/kernel/security/tomoyo/exception_policy 487c3fa109aSTetsuo Handa * 488c3fa109aSTetsuo Handa * and all entries are retrieved by 489c3fa109aSTetsuo Handa * 490c3fa109aSTetsuo Handa * # grep ^deny_rewrite /sys/kernel/security/tomoyo/exception_policy 491c3fa109aSTetsuo Handa * 492c3fa109aSTetsuo Handa * In the example above, if a process requested to rewrite /var/log/messages , 493c3fa109aSTetsuo Handa * the process can't rewrite unless the domain which that process belongs to 494c3fa109aSTetsuo Handa * has "allow_rewrite /var/log/messages" entry. 495c3fa109aSTetsuo Handa * 496c3fa109aSTetsuo Handa * It is not a desirable behavior that we have to add "\040(deleted)" suffix 497c3fa109aSTetsuo Handa * when we want to allow rewriting already unlink()ed file. As of now, 498c3fa109aSTetsuo Handa * LSM version of TOMOYO is using __d_path() for calculating pathname. 499c3fa109aSTetsuo Handa * Non LSM version of TOMOYO is using its own function which doesn't append 500c3fa109aSTetsuo Handa * " (deleted)" suffix if the file is already unlink()ed; so that we don't 501c3fa109aSTetsuo Handa * need to worry whether the file is already unlink()ed or not. 502c3fa109aSTetsuo Handa */ 503b69a54eeSKentaro Takeda static LIST_HEAD(tomoyo_no_rewrite_list); 504b69a54eeSKentaro Takeda 505b69a54eeSKentaro Takeda /** 506b69a54eeSKentaro Takeda * tomoyo_update_no_rewrite_entry - Update "struct tomoyo_no_rewrite_entry" list. 507b69a54eeSKentaro Takeda * 508b69a54eeSKentaro Takeda * @pattern: Pathname pattern that are not rewritable by default. 509b69a54eeSKentaro Takeda * @is_delete: True if it is a delete request. 510b69a54eeSKentaro Takeda * 511b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 512fdb8ebb7STetsuo Handa * 513fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 514b69a54eeSKentaro Takeda */ 515b69a54eeSKentaro Takeda static int tomoyo_update_no_rewrite_entry(const char *pattern, 516b69a54eeSKentaro Takeda const bool is_delete) 517b69a54eeSKentaro Takeda { 518ca0b7df3STetsuo Handa struct tomoyo_no_rewrite_entry *entry = NULL; 519ca0b7df3STetsuo Handa struct tomoyo_no_rewrite_entry *ptr; 520b69a54eeSKentaro Takeda const struct tomoyo_path_info *saved_pattern; 521ca0b7df3STetsuo Handa int error = is_delete ? -ENOENT : -ENOMEM; 522b69a54eeSKentaro Takeda 523b69a54eeSKentaro Takeda if (!tomoyo_is_correct_path(pattern, 0, 0, 0, __func__)) 524b69a54eeSKentaro Takeda return -EINVAL; 525bf24fb01STetsuo Handa saved_pattern = tomoyo_get_name(pattern); 526b69a54eeSKentaro Takeda if (!saved_pattern) 527ca0b7df3STetsuo Handa return error; 528ca0b7df3STetsuo Handa if (!is_delete) 529ca0b7df3STetsuo Handa entry = kmalloc(sizeof(*entry), GFP_KERNEL); 530f737d95dSTetsuo Handa mutex_lock(&tomoyo_policy_lock); 531fdb8ebb7STetsuo Handa list_for_each_entry_rcu(ptr, &tomoyo_no_rewrite_list, list) { 532b69a54eeSKentaro Takeda if (ptr->pattern != saved_pattern) 533b69a54eeSKentaro Takeda continue; 534b69a54eeSKentaro Takeda ptr->is_deleted = is_delete; 535b69a54eeSKentaro Takeda error = 0; 536ca0b7df3STetsuo Handa break; 537b69a54eeSKentaro Takeda } 538ca0b7df3STetsuo Handa if (!is_delete && error && tomoyo_memory_ok(entry)) { 539ca0b7df3STetsuo Handa entry->pattern = saved_pattern; 540bf24fb01STetsuo Handa saved_pattern = NULL; 541ca0b7df3STetsuo Handa list_add_tail_rcu(&entry->list, &tomoyo_no_rewrite_list); 542ca0b7df3STetsuo Handa entry = NULL; 543b69a54eeSKentaro Takeda error = 0; 544ca0b7df3STetsuo Handa } 545f737d95dSTetsuo Handa mutex_unlock(&tomoyo_policy_lock); 546bf24fb01STetsuo Handa tomoyo_put_name(saved_pattern); 547ca0b7df3STetsuo Handa kfree(entry); 548b69a54eeSKentaro Takeda return error; 549b69a54eeSKentaro Takeda } 550b69a54eeSKentaro Takeda 551b69a54eeSKentaro Takeda /** 552b69a54eeSKentaro Takeda * tomoyo_is_no_rewrite_file - Check if the given pathname is not permitted to be rewrited. 553b69a54eeSKentaro Takeda * 554b69a54eeSKentaro Takeda * @filename: Filename to check. 555b69a54eeSKentaro Takeda * 556b69a54eeSKentaro Takeda * Returns true if @filename is specified by "deny_rewrite" directive, 557b69a54eeSKentaro Takeda * false otherwise. 558fdb8ebb7STetsuo Handa * 559fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 560b69a54eeSKentaro Takeda */ 561b69a54eeSKentaro Takeda static bool tomoyo_is_no_rewrite_file(const struct tomoyo_path_info *filename) 562b69a54eeSKentaro Takeda { 563b69a54eeSKentaro Takeda struct tomoyo_no_rewrite_entry *ptr; 564b69a54eeSKentaro Takeda bool found = false; 565b69a54eeSKentaro Takeda 566fdb8ebb7STetsuo Handa list_for_each_entry_rcu(ptr, &tomoyo_no_rewrite_list, list) { 567b69a54eeSKentaro Takeda if (ptr->is_deleted) 568b69a54eeSKentaro Takeda continue; 569b69a54eeSKentaro Takeda if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) 570b69a54eeSKentaro Takeda continue; 571b69a54eeSKentaro Takeda found = true; 572b69a54eeSKentaro Takeda break; 573b69a54eeSKentaro Takeda } 574b69a54eeSKentaro Takeda return found; 575b69a54eeSKentaro Takeda } 576b69a54eeSKentaro Takeda 577b69a54eeSKentaro Takeda /** 578b69a54eeSKentaro Takeda * tomoyo_write_no_rewrite_policy - Write "struct tomoyo_no_rewrite_entry" list. 579b69a54eeSKentaro Takeda * 580b69a54eeSKentaro Takeda * @data: String to parse. 581b69a54eeSKentaro Takeda * @is_delete: True if it is a delete request. 582b69a54eeSKentaro Takeda * 583b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 584fdb8ebb7STetsuo Handa * 585fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 586b69a54eeSKentaro Takeda */ 587b69a54eeSKentaro Takeda int tomoyo_write_no_rewrite_policy(char *data, const bool is_delete) 588b69a54eeSKentaro Takeda { 589b69a54eeSKentaro Takeda return tomoyo_update_no_rewrite_entry(data, is_delete); 590b69a54eeSKentaro Takeda } 591b69a54eeSKentaro Takeda 592b69a54eeSKentaro Takeda /** 593b69a54eeSKentaro Takeda * tomoyo_read_no_rewrite_policy - Read "struct tomoyo_no_rewrite_entry" list. 594b69a54eeSKentaro Takeda * 595b69a54eeSKentaro Takeda * @head: Pointer to "struct tomoyo_io_buffer". 596b69a54eeSKentaro Takeda * 597b69a54eeSKentaro Takeda * Returns true on success, false otherwise. 598fdb8ebb7STetsuo Handa * 599fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 600b69a54eeSKentaro Takeda */ 601b69a54eeSKentaro Takeda bool tomoyo_read_no_rewrite_policy(struct tomoyo_io_buffer *head) 602b69a54eeSKentaro Takeda { 603b69a54eeSKentaro Takeda struct list_head *pos; 604b69a54eeSKentaro Takeda bool done = true; 605b69a54eeSKentaro Takeda 606b69a54eeSKentaro Takeda list_for_each_cookie(pos, head->read_var2, &tomoyo_no_rewrite_list) { 607b69a54eeSKentaro Takeda struct tomoyo_no_rewrite_entry *ptr; 608b69a54eeSKentaro Takeda ptr = list_entry(pos, struct tomoyo_no_rewrite_entry, list); 609b69a54eeSKentaro Takeda if (ptr->is_deleted) 610b69a54eeSKentaro Takeda continue; 6117d2948b1STetsuo Handa done = tomoyo_io_printf(head, TOMOYO_KEYWORD_DENY_REWRITE 6127d2948b1STetsuo Handa "%s\n", ptr->pattern->name); 6137d2948b1STetsuo Handa if (!done) 614b69a54eeSKentaro Takeda break; 615b69a54eeSKentaro Takeda } 616b69a54eeSKentaro Takeda return done; 617b69a54eeSKentaro Takeda } 618b69a54eeSKentaro Takeda 619b69a54eeSKentaro Takeda /** 620b69a54eeSKentaro Takeda * tomoyo_update_file_acl - Update file's read/write/execute ACL. 621b69a54eeSKentaro Takeda * 622b69a54eeSKentaro Takeda * @filename: Filename. 623b69a54eeSKentaro Takeda * @perm: Permission (between 1 to 7). 624b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 625b69a54eeSKentaro Takeda * @is_delete: True if it is a delete request. 626b69a54eeSKentaro Takeda * 627b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 628b69a54eeSKentaro Takeda * 629b69a54eeSKentaro Takeda * This is legacy support interface for older policy syntax. 630b69a54eeSKentaro Takeda * Current policy syntax uses "allow_read/write" instead of "6", 631b69a54eeSKentaro Takeda * "allow_read" instead of "4", "allow_write" instead of "2", 632b69a54eeSKentaro Takeda * "allow_execute" instead of "1". 633fdb8ebb7STetsuo Handa * 634fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 635b69a54eeSKentaro Takeda */ 636b69a54eeSKentaro Takeda static int tomoyo_update_file_acl(const char *filename, u8 perm, 637b69a54eeSKentaro Takeda struct tomoyo_domain_info * const domain, 638b69a54eeSKentaro Takeda const bool is_delete) 639b69a54eeSKentaro Takeda { 640b69a54eeSKentaro Takeda if (perm > 7 || !perm) { 641b69a54eeSKentaro Takeda printk(KERN_DEBUG "%s: Invalid permission '%d %s'\n", 642b69a54eeSKentaro Takeda __func__, perm, filename); 643b69a54eeSKentaro Takeda return -EINVAL; 644b69a54eeSKentaro Takeda } 645b69a54eeSKentaro Takeda if (filename[0] != '@' && tomoyo_strendswith(filename, "/")) 646b69a54eeSKentaro Takeda /* 647b69a54eeSKentaro Takeda * Only 'allow_mkdir' and 'allow_rmdir' are valid for 648b69a54eeSKentaro Takeda * directory permissions. 649b69a54eeSKentaro Takeda */ 650b69a54eeSKentaro Takeda return 0; 651b69a54eeSKentaro Takeda if (perm & 4) 652b69a54eeSKentaro Takeda tomoyo_update_single_path_acl(TOMOYO_TYPE_READ_ACL, filename, 653b69a54eeSKentaro Takeda domain, is_delete); 654b69a54eeSKentaro Takeda if (perm & 2) 655b69a54eeSKentaro Takeda tomoyo_update_single_path_acl(TOMOYO_TYPE_WRITE_ACL, filename, 656b69a54eeSKentaro Takeda domain, is_delete); 657b69a54eeSKentaro Takeda if (perm & 1) 658b69a54eeSKentaro Takeda tomoyo_update_single_path_acl(TOMOYO_TYPE_EXECUTE_ACL, 659b69a54eeSKentaro Takeda filename, domain, is_delete); 660b69a54eeSKentaro Takeda return 0; 661b69a54eeSKentaro Takeda } 662b69a54eeSKentaro Takeda 663b69a54eeSKentaro Takeda /** 664b69a54eeSKentaro Takeda * tomoyo_check_single_path_acl2 - Check permission for single path operation. 665b69a54eeSKentaro Takeda * 666b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 667b69a54eeSKentaro Takeda * @filename: Filename to check. 668b69a54eeSKentaro Takeda * @perm: Permission. 669b69a54eeSKentaro Takeda * @may_use_pattern: True if patterned ACL is permitted. 670b69a54eeSKentaro Takeda * 671b69a54eeSKentaro Takeda * Returns 0 on success, -EPERM otherwise. 672fdb8ebb7STetsuo Handa * 673fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 674b69a54eeSKentaro Takeda */ 675b69a54eeSKentaro Takeda static int tomoyo_check_single_path_acl2(const struct tomoyo_domain_info * 676b69a54eeSKentaro Takeda domain, 677b69a54eeSKentaro Takeda const struct tomoyo_path_info * 678b69a54eeSKentaro Takeda filename, 679937bf613STetsuo Handa const u32 perm, 680b69a54eeSKentaro Takeda const bool may_use_pattern) 681b69a54eeSKentaro Takeda { 682b69a54eeSKentaro Takeda struct tomoyo_acl_info *ptr; 683b69a54eeSKentaro Takeda int error = -EPERM; 684b69a54eeSKentaro Takeda 685fdb8ebb7STetsuo Handa list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { 686b69a54eeSKentaro Takeda struct tomoyo_single_path_acl_record *acl; 687ea13ddbaSTetsuo Handa if (ptr->type != TOMOYO_TYPE_SINGLE_PATH_ACL) 688b69a54eeSKentaro Takeda continue; 689b69a54eeSKentaro Takeda acl = container_of(ptr, struct tomoyo_single_path_acl_record, 690b69a54eeSKentaro Takeda head); 691937bf613STetsuo Handa if (perm <= 0xFFFF) { 692b69a54eeSKentaro Takeda if (!(acl->perm & perm)) 693b69a54eeSKentaro Takeda continue; 694937bf613STetsuo Handa } else { 695937bf613STetsuo Handa if (!(acl->perm_high & (perm >> 16))) 696937bf613STetsuo Handa continue; 697937bf613STetsuo Handa } 698b69a54eeSKentaro Takeda if (may_use_pattern || !acl->filename->is_patterned) { 699b69a54eeSKentaro Takeda if (!tomoyo_path_matches_pattern(filename, 700b69a54eeSKentaro Takeda acl->filename)) 701b69a54eeSKentaro Takeda continue; 702b69a54eeSKentaro Takeda } else { 703b69a54eeSKentaro Takeda continue; 704b69a54eeSKentaro Takeda } 705b69a54eeSKentaro Takeda error = 0; 706b69a54eeSKentaro Takeda break; 707b69a54eeSKentaro Takeda } 708b69a54eeSKentaro Takeda return error; 709b69a54eeSKentaro Takeda } 710b69a54eeSKentaro Takeda 711b69a54eeSKentaro Takeda /** 712b69a54eeSKentaro Takeda * tomoyo_check_file_acl - Check permission for opening files. 713b69a54eeSKentaro Takeda * 714b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 715b69a54eeSKentaro Takeda * @filename: Filename to check. 716b69a54eeSKentaro Takeda * @operation: Mode ("read" or "write" or "read/write" or "execute"). 717b69a54eeSKentaro Takeda * 718b69a54eeSKentaro Takeda * Returns 0 on success, -EPERM otherwise. 719fdb8ebb7STetsuo Handa * 720fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 721b69a54eeSKentaro Takeda */ 722b69a54eeSKentaro Takeda static int tomoyo_check_file_acl(const struct tomoyo_domain_info *domain, 723b69a54eeSKentaro Takeda const struct tomoyo_path_info *filename, 724b69a54eeSKentaro Takeda const u8 operation) 725b69a54eeSKentaro Takeda { 726937bf613STetsuo Handa u32 perm = 0; 727b69a54eeSKentaro Takeda 728b69a54eeSKentaro Takeda if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE)) 729b69a54eeSKentaro Takeda return 0; 730b69a54eeSKentaro Takeda if (operation == 6) 731b69a54eeSKentaro Takeda perm = 1 << TOMOYO_TYPE_READ_WRITE_ACL; 732b69a54eeSKentaro Takeda else if (operation == 4) 733b69a54eeSKentaro Takeda perm = 1 << TOMOYO_TYPE_READ_ACL; 734b69a54eeSKentaro Takeda else if (operation == 2) 735b69a54eeSKentaro Takeda perm = 1 << TOMOYO_TYPE_WRITE_ACL; 736b69a54eeSKentaro Takeda else if (operation == 1) 737b69a54eeSKentaro Takeda perm = 1 << TOMOYO_TYPE_EXECUTE_ACL; 738b69a54eeSKentaro Takeda else 739b69a54eeSKentaro Takeda BUG(); 740b69a54eeSKentaro Takeda return tomoyo_check_single_path_acl2(domain, filename, perm, 741b69a54eeSKentaro Takeda operation != 1); 742b69a54eeSKentaro Takeda } 743b69a54eeSKentaro Takeda 744b69a54eeSKentaro Takeda /** 745b69a54eeSKentaro Takeda * tomoyo_check_file_perm2 - Check permission for opening files. 746b69a54eeSKentaro Takeda * 747b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 748b69a54eeSKentaro Takeda * @filename: Filename to check. 749b69a54eeSKentaro Takeda * @perm: Mode ("read" or "write" or "read/write" or "execute"). 750b69a54eeSKentaro Takeda * @operation: Operation name passed used for verbose mode. 751b69a54eeSKentaro Takeda * @mode: Access control mode. 752b69a54eeSKentaro Takeda * 753b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 754fdb8ebb7STetsuo Handa * 755fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 756b69a54eeSKentaro Takeda */ 757b69a54eeSKentaro Takeda static int tomoyo_check_file_perm2(struct tomoyo_domain_info * const domain, 758b69a54eeSKentaro Takeda const struct tomoyo_path_info *filename, 759b69a54eeSKentaro Takeda const u8 perm, const char *operation, 760b69a54eeSKentaro Takeda const u8 mode) 761b69a54eeSKentaro Takeda { 762b69a54eeSKentaro Takeda const bool is_enforce = (mode == 3); 763b69a54eeSKentaro Takeda const char *msg = "<unknown>"; 764b69a54eeSKentaro Takeda int error = 0; 765b69a54eeSKentaro Takeda 766b69a54eeSKentaro Takeda if (!filename) 767b69a54eeSKentaro Takeda return 0; 768b69a54eeSKentaro Takeda error = tomoyo_check_file_acl(domain, filename, perm); 769ea13ddbaSTetsuo Handa if (error && perm == 4 && !domain->ignore_global_allow_read 770b69a54eeSKentaro Takeda && tomoyo_is_globally_readable_file(filename)) 771b69a54eeSKentaro Takeda error = 0; 772b69a54eeSKentaro Takeda if (perm == 6) 773b69a54eeSKentaro Takeda msg = tomoyo_sp2keyword(TOMOYO_TYPE_READ_WRITE_ACL); 774b69a54eeSKentaro Takeda else if (perm == 4) 775b69a54eeSKentaro Takeda msg = tomoyo_sp2keyword(TOMOYO_TYPE_READ_ACL); 776b69a54eeSKentaro Takeda else if (perm == 2) 777b69a54eeSKentaro Takeda msg = tomoyo_sp2keyword(TOMOYO_TYPE_WRITE_ACL); 778b69a54eeSKentaro Takeda else if (perm == 1) 779b69a54eeSKentaro Takeda msg = tomoyo_sp2keyword(TOMOYO_TYPE_EXECUTE_ACL); 780b69a54eeSKentaro Takeda else 781b69a54eeSKentaro Takeda BUG(); 782b69a54eeSKentaro Takeda if (!error) 783b69a54eeSKentaro Takeda return 0; 784b69a54eeSKentaro Takeda if (tomoyo_verbose_mode(domain)) 785b69a54eeSKentaro Takeda printk(KERN_WARNING "TOMOYO-%s: Access '%s(%s) %s' denied " 786b69a54eeSKentaro Takeda "for %s\n", tomoyo_get_msg(is_enforce), msg, operation, 787b69a54eeSKentaro Takeda filename->name, tomoyo_get_last_name(domain)); 788b69a54eeSKentaro Takeda if (is_enforce) 789b69a54eeSKentaro Takeda return error; 790b69a54eeSKentaro Takeda if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) { 791b69a54eeSKentaro Takeda /* Don't use patterns for execute permission. */ 792b69a54eeSKentaro Takeda const struct tomoyo_path_info *patterned_file = (perm != 1) ? 793b69a54eeSKentaro Takeda tomoyo_get_file_pattern(filename) : filename; 794b69a54eeSKentaro Takeda tomoyo_update_file_acl(patterned_file->name, perm, 795b69a54eeSKentaro Takeda domain, false); 796b69a54eeSKentaro Takeda } 797b69a54eeSKentaro Takeda return 0; 798b69a54eeSKentaro Takeda } 799b69a54eeSKentaro Takeda 800b69a54eeSKentaro Takeda /** 801b69a54eeSKentaro Takeda * tomoyo_write_file_policy - Update file related list. 802b69a54eeSKentaro Takeda * 803b69a54eeSKentaro Takeda * @data: String to parse. 804b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 805b69a54eeSKentaro Takeda * @is_delete: True if it is a delete request. 806b69a54eeSKentaro Takeda * 807b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 808fdb8ebb7STetsuo Handa * 809fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 810b69a54eeSKentaro Takeda */ 811b69a54eeSKentaro Takeda int tomoyo_write_file_policy(char *data, struct tomoyo_domain_info *domain, 812b69a54eeSKentaro Takeda const bool is_delete) 813b69a54eeSKentaro Takeda { 814b69a54eeSKentaro Takeda char *filename = strchr(data, ' '); 815b69a54eeSKentaro Takeda char *filename2; 816b69a54eeSKentaro Takeda unsigned int perm; 817b69a54eeSKentaro Takeda u8 type; 818b69a54eeSKentaro Takeda 819b69a54eeSKentaro Takeda if (!filename) 820b69a54eeSKentaro Takeda return -EINVAL; 821b69a54eeSKentaro Takeda *filename++ = '\0'; 822b69a54eeSKentaro Takeda if (sscanf(data, "%u", &perm) == 1) 823b69a54eeSKentaro Takeda return tomoyo_update_file_acl(filename, (u8) perm, domain, 824b69a54eeSKentaro Takeda is_delete); 825b69a54eeSKentaro Takeda if (strncmp(data, "allow_", 6)) 826b69a54eeSKentaro Takeda goto out; 827b69a54eeSKentaro Takeda data += 6; 828b69a54eeSKentaro Takeda for (type = 0; type < TOMOYO_MAX_SINGLE_PATH_OPERATION; type++) { 829b69a54eeSKentaro Takeda if (strcmp(data, tomoyo_sp_keyword[type])) 830b69a54eeSKentaro Takeda continue; 831b69a54eeSKentaro Takeda return tomoyo_update_single_path_acl(type, filename, 832b69a54eeSKentaro Takeda domain, is_delete); 833b69a54eeSKentaro Takeda } 834b69a54eeSKentaro Takeda filename2 = strchr(filename, ' '); 835b69a54eeSKentaro Takeda if (!filename2) 836b69a54eeSKentaro Takeda goto out; 837b69a54eeSKentaro Takeda *filename2++ = '\0'; 838b69a54eeSKentaro Takeda for (type = 0; type < TOMOYO_MAX_DOUBLE_PATH_OPERATION; type++) { 839b69a54eeSKentaro Takeda if (strcmp(data, tomoyo_dp_keyword[type])) 840b69a54eeSKentaro Takeda continue; 841b69a54eeSKentaro Takeda return tomoyo_update_double_path_acl(type, filename, filename2, 842b69a54eeSKentaro Takeda domain, is_delete); 843b69a54eeSKentaro Takeda } 844b69a54eeSKentaro Takeda out: 845b69a54eeSKentaro Takeda return -EINVAL; 846b69a54eeSKentaro Takeda } 847b69a54eeSKentaro Takeda 848b69a54eeSKentaro Takeda /** 849b69a54eeSKentaro Takeda * tomoyo_update_single_path_acl - Update "struct tomoyo_single_path_acl_record" list. 850b69a54eeSKentaro Takeda * 851b69a54eeSKentaro Takeda * @type: Type of operation. 852b69a54eeSKentaro Takeda * @filename: Filename. 853b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 854b69a54eeSKentaro Takeda * @is_delete: True if it is a delete request. 855b69a54eeSKentaro Takeda * 856b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 857fdb8ebb7STetsuo Handa * 858fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 859b69a54eeSKentaro Takeda */ 860b69a54eeSKentaro Takeda static int tomoyo_update_single_path_acl(const u8 type, const char *filename, 861b69a54eeSKentaro Takeda struct tomoyo_domain_info * 862b69a54eeSKentaro Takeda const domain, const bool is_delete) 863b69a54eeSKentaro Takeda { 864937bf613STetsuo Handa static const u32 rw_mask = 865b69a54eeSKentaro Takeda (1 << TOMOYO_TYPE_READ_ACL) | (1 << TOMOYO_TYPE_WRITE_ACL); 866b69a54eeSKentaro Takeda const struct tomoyo_path_info *saved_filename; 867b69a54eeSKentaro Takeda struct tomoyo_acl_info *ptr; 868ca0b7df3STetsuo Handa struct tomoyo_single_path_acl_record *entry = NULL; 869ca0b7df3STetsuo Handa int error = is_delete ? -ENOENT : -ENOMEM; 870937bf613STetsuo Handa const u32 perm = 1 << type; 871b69a54eeSKentaro Takeda 872b69a54eeSKentaro Takeda if (!domain) 873b69a54eeSKentaro Takeda return -EINVAL; 874b69a54eeSKentaro Takeda if (!tomoyo_is_correct_path(filename, 0, 0, 0, __func__)) 875b69a54eeSKentaro Takeda return -EINVAL; 876bf24fb01STetsuo Handa saved_filename = tomoyo_get_name(filename); 877b69a54eeSKentaro Takeda if (!saved_filename) 878b69a54eeSKentaro Takeda return -ENOMEM; 879ca0b7df3STetsuo Handa if (!is_delete) 880ca0b7df3STetsuo Handa entry = kmalloc(sizeof(*entry), GFP_KERNEL); 881f737d95dSTetsuo Handa mutex_lock(&tomoyo_policy_lock); 882fdb8ebb7STetsuo Handa list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { 883ca0b7df3STetsuo Handa struct tomoyo_single_path_acl_record *acl = 884ca0b7df3STetsuo Handa container_of(ptr, struct tomoyo_single_path_acl_record, 885ca0b7df3STetsuo Handa head); 886ea13ddbaSTetsuo Handa if (ptr->type != TOMOYO_TYPE_SINGLE_PATH_ACL) 887b69a54eeSKentaro Takeda continue; 888b69a54eeSKentaro Takeda if (acl->filename != saved_filename) 889b69a54eeSKentaro Takeda continue; 890ca0b7df3STetsuo Handa if (is_delete) { 891ca0b7df3STetsuo Handa if (perm <= 0xFFFF) 892ca0b7df3STetsuo Handa acl->perm &= ~perm; 893ca0b7df3STetsuo Handa else 894ca0b7df3STetsuo Handa acl->perm_high &= ~(perm >> 16); 895ca0b7df3STetsuo Handa if ((acl->perm & rw_mask) != rw_mask) 896ca0b7df3STetsuo Handa acl->perm &= ~(1 << TOMOYO_TYPE_READ_WRITE_ACL); 897ca0b7df3STetsuo Handa else if (!(acl->perm & 898ca0b7df3STetsuo Handa (1 << TOMOYO_TYPE_READ_WRITE_ACL))) 899ca0b7df3STetsuo Handa acl->perm &= ~rw_mask; 900ca0b7df3STetsuo Handa } else { 901937bf613STetsuo Handa if (perm <= 0xFFFF) 902b69a54eeSKentaro Takeda acl->perm |= perm; 903937bf613STetsuo Handa else 904937bf613STetsuo Handa acl->perm_high |= (perm >> 16); 905b69a54eeSKentaro Takeda if ((acl->perm & rw_mask) == rw_mask) 906b69a54eeSKentaro Takeda acl->perm |= 1 << TOMOYO_TYPE_READ_WRITE_ACL; 907b69a54eeSKentaro Takeda else if (acl->perm & (1 << TOMOYO_TYPE_READ_WRITE_ACL)) 908b69a54eeSKentaro Takeda acl->perm |= rw_mask; 909b69a54eeSKentaro Takeda } 910b69a54eeSKentaro Takeda error = 0; 911b69a54eeSKentaro Takeda break; 912b69a54eeSKentaro Takeda } 913ca0b7df3STetsuo Handa if (!is_delete && error && tomoyo_memory_ok(entry)) { 914ca0b7df3STetsuo Handa entry->head.type = TOMOYO_TYPE_SINGLE_PATH_ACL; 915ca0b7df3STetsuo Handa if (perm <= 0xFFFF) 916ca0b7df3STetsuo Handa entry->perm = perm; 917ca0b7df3STetsuo Handa else 918ca0b7df3STetsuo Handa entry->perm_high = (perm >> 16); 919ca0b7df3STetsuo Handa if (perm == (1 << TOMOYO_TYPE_READ_WRITE_ACL)) 920ca0b7df3STetsuo Handa entry->perm |= rw_mask; 921ca0b7df3STetsuo Handa entry->filename = saved_filename; 922bf24fb01STetsuo Handa saved_filename = NULL; 923ca0b7df3STetsuo Handa list_add_tail_rcu(&entry->head.list, &domain->acl_info_list); 924ca0b7df3STetsuo Handa entry = NULL; 925ca0b7df3STetsuo Handa error = 0; 926ca0b7df3STetsuo Handa } 927f737d95dSTetsuo Handa mutex_unlock(&tomoyo_policy_lock); 928ca0b7df3STetsuo Handa kfree(entry); 929bf24fb01STetsuo Handa tomoyo_put_name(saved_filename); 930b69a54eeSKentaro Takeda return error; 931b69a54eeSKentaro Takeda } 932b69a54eeSKentaro Takeda 933b69a54eeSKentaro Takeda /** 934b69a54eeSKentaro Takeda * tomoyo_update_double_path_acl - Update "struct tomoyo_double_path_acl_record" list. 935b69a54eeSKentaro Takeda * 936b69a54eeSKentaro Takeda * @type: Type of operation. 937b69a54eeSKentaro Takeda * @filename1: First filename. 938b69a54eeSKentaro Takeda * @filename2: Second filename. 939b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 940b69a54eeSKentaro Takeda * @is_delete: True if it is a delete request. 941b69a54eeSKentaro Takeda * 942b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 943fdb8ebb7STetsuo Handa * 944fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 945b69a54eeSKentaro Takeda */ 946b69a54eeSKentaro Takeda static int tomoyo_update_double_path_acl(const u8 type, const char *filename1, 947b69a54eeSKentaro Takeda const char *filename2, 948b69a54eeSKentaro Takeda struct tomoyo_domain_info * 949b69a54eeSKentaro Takeda const domain, const bool is_delete) 950b69a54eeSKentaro Takeda { 951b69a54eeSKentaro Takeda const struct tomoyo_path_info *saved_filename1; 952b69a54eeSKentaro Takeda const struct tomoyo_path_info *saved_filename2; 953b69a54eeSKentaro Takeda struct tomoyo_acl_info *ptr; 954ca0b7df3STetsuo Handa struct tomoyo_double_path_acl_record *entry = NULL; 955ca0b7df3STetsuo Handa int error = is_delete ? -ENOENT : -ENOMEM; 956b69a54eeSKentaro Takeda const u8 perm = 1 << type; 957b69a54eeSKentaro Takeda 958b69a54eeSKentaro Takeda if (!domain) 959b69a54eeSKentaro Takeda return -EINVAL; 960b69a54eeSKentaro Takeda if (!tomoyo_is_correct_path(filename1, 0, 0, 0, __func__) || 961b69a54eeSKentaro Takeda !tomoyo_is_correct_path(filename2, 0, 0, 0, __func__)) 962b69a54eeSKentaro Takeda return -EINVAL; 963bf24fb01STetsuo Handa saved_filename1 = tomoyo_get_name(filename1); 964bf24fb01STetsuo Handa saved_filename2 = tomoyo_get_name(filename2); 965b69a54eeSKentaro Takeda if (!saved_filename1 || !saved_filename2) 966ca0b7df3STetsuo Handa goto out; 967ca0b7df3STetsuo Handa if (!is_delete) 968ca0b7df3STetsuo Handa entry = kmalloc(sizeof(*entry), GFP_KERNEL); 969f737d95dSTetsuo Handa mutex_lock(&tomoyo_policy_lock); 970ca0b7df3STetsuo Handa list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { 971ca0b7df3STetsuo Handa struct tomoyo_double_path_acl_record *acl = 972ca0b7df3STetsuo Handa container_of(ptr, struct tomoyo_double_path_acl_record, 973ca0b7df3STetsuo Handa head); 974ca0b7df3STetsuo Handa if (ptr->type != TOMOYO_TYPE_DOUBLE_PATH_ACL) 975ca0b7df3STetsuo Handa continue; 976ca0b7df3STetsuo Handa if (acl->filename1 != saved_filename1 || 977ca0b7df3STetsuo Handa acl->filename2 != saved_filename2) 978ca0b7df3STetsuo Handa continue; 979b69a54eeSKentaro Takeda if (is_delete) 980b69a54eeSKentaro Takeda acl->perm &= ~perm; 981ca0b7df3STetsuo Handa else 982ca0b7df3STetsuo Handa acl->perm |= perm; 983b69a54eeSKentaro Takeda error = 0; 984b69a54eeSKentaro Takeda break; 985b69a54eeSKentaro Takeda } 986ca0b7df3STetsuo Handa if (!is_delete && error && tomoyo_memory_ok(entry)) { 987ca0b7df3STetsuo Handa entry->head.type = TOMOYO_TYPE_DOUBLE_PATH_ACL; 988ca0b7df3STetsuo Handa entry->perm = perm; 989ca0b7df3STetsuo Handa entry->filename1 = saved_filename1; 990bf24fb01STetsuo Handa saved_filename1 = NULL; 991ca0b7df3STetsuo Handa entry->filename2 = saved_filename2; 992bf24fb01STetsuo Handa saved_filename2 = NULL; 993ca0b7df3STetsuo Handa list_add_tail_rcu(&entry->head.list, &domain->acl_info_list); 994ca0b7df3STetsuo Handa entry = NULL; 995ca0b7df3STetsuo Handa error = 0; 996ca0b7df3STetsuo Handa } 997f737d95dSTetsuo Handa mutex_unlock(&tomoyo_policy_lock); 998ca0b7df3STetsuo Handa out: 999bf24fb01STetsuo Handa tomoyo_put_name(saved_filename1); 1000bf24fb01STetsuo Handa tomoyo_put_name(saved_filename2); 1001ca0b7df3STetsuo Handa kfree(entry); 1002b69a54eeSKentaro Takeda return error; 1003b69a54eeSKentaro Takeda } 1004b69a54eeSKentaro Takeda 1005b69a54eeSKentaro Takeda /** 1006b69a54eeSKentaro Takeda * tomoyo_check_single_path_acl - Check permission for single path operation. 1007b69a54eeSKentaro Takeda * 1008b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 1009b69a54eeSKentaro Takeda * @type: Type of operation. 1010b69a54eeSKentaro Takeda * @filename: Filename to check. 1011b69a54eeSKentaro Takeda * 1012b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 1013fdb8ebb7STetsuo Handa * 1014fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 1015b69a54eeSKentaro Takeda */ 1016b69a54eeSKentaro Takeda static int tomoyo_check_single_path_acl(struct tomoyo_domain_info *domain, 1017b69a54eeSKentaro Takeda const u8 type, 1018b69a54eeSKentaro Takeda const struct tomoyo_path_info *filename) 1019b69a54eeSKentaro Takeda { 1020b69a54eeSKentaro Takeda if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE)) 1021b69a54eeSKentaro Takeda return 0; 1022b69a54eeSKentaro Takeda return tomoyo_check_single_path_acl2(domain, filename, 1 << type, 1); 1023b69a54eeSKentaro Takeda } 1024b69a54eeSKentaro Takeda 1025b69a54eeSKentaro Takeda /** 1026b69a54eeSKentaro Takeda * tomoyo_check_double_path_acl - Check permission for double path operation. 1027b69a54eeSKentaro Takeda * 1028b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 1029b69a54eeSKentaro Takeda * @type: Type of operation. 1030b69a54eeSKentaro Takeda * @filename1: First filename to check. 1031b69a54eeSKentaro Takeda * @filename2: Second filename to check. 1032b69a54eeSKentaro Takeda * 1033b69a54eeSKentaro Takeda * Returns 0 on success, -EPERM otherwise. 1034fdb8ebb7STetsuo Handa * 1035fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 1036b69a54eeSKentaro Takeda */ 1037b69a54eeSKentaro Takeda static int tomoyo_check_double_path_acl(const struct tomoyo_domain_info *domain, 1038b69a54eeSKentaro Takeda const u8 type, 1039b69a54eeSKentaro Takeda const struct tomoyo_path_info * 1040b69a54eeSKentaro Takeda filename1, 1041b69a54eeSKentaro Takeda const struct tomoyo_path_info * 1042b69a54eeSKentaro Takeda filename2) 1043b69a54eeSKentaro Takeda { 1044b69a54eeSKentaro Takeda struct tomoyo_acl_info *ptr; 1045b69a54eeSKentaro Takeda const u8 perm = 1 << type; 1046b69a54eeSKentaro Takeda int error = -EPERM; 1047b69a54eeSKentaro Takeda 1048b69a54eeSKentaro Takeda if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE)) 1049b69a54eeSKentaro Takeda return 0; 1050fdb8ebb7STetsuo Handa list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { 1051b69a54eeSKentaro Takeda struct tomoyo_double_path_acl_record *acl; 1052ea13ddbaSTetsuo Handa if (ptr->type != TOMOYO_TYPE_DOUBLE_PATH_ACL) 1053b69a54eeSKentaro Takeda continue; 1054b69a54eeSKentaro Takeda acl = container_of(ptr, struct tomoyo_double_path_acl_record, 1055b69a54eeSKentaro Takeda head); 1056b69a54eeSKentaro Takeda if (!(acl->perm & perm)) 1057b69a54eeSKentaro Takeda continue; 1058b69a54eeSKentaro Takeda if (!tomoyo_path_matches_pattern(filename1, acl->filename1)) 1059b69a54eeSKentaro Takeda continue; 1060b69a54eeSKentaro Takeda if (!tomoyo_path_matches_pattern(filename2, acl->filename2)) 1061b69a54eeSKentaro Takeda continue; 1062b69a54eeSKentaro Takeda error = 0; 1063b69a54eeSKentaro Takeda break; 1064b69a54eeSKentaro Takeda } 1065b69a54eeSKentaro Takeda return error; 1066b69a54eeSKentaro Takeda } 1067b69a54eeSKentaro Takeda 1068b69a54eeSKentaro Takeda /** 1069b69a54eeSKentaro Takeda * tomoyo_check_single_path_permission2 - Check permission for single path operation. 1070b69a54eeSKentaro Takeda * 1071b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 1072b69a54eeSKentaro Takeda * @operation: Type of operation. 1073b69a54eeSKentaro Takeda * @filename: Filename to check. 1074b69a54eeSKentaro Takeda * @mode: Access control mode. 1075b69a54eeSKentaro Takeda * 1076b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 1077fdb8ebb7STetsuo Handa * 1078fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 1079b69a54eeSKentaro Takeda */ 1080b69a54eeSKentaro Takeda static int tomoyo_check_single_path_permission2(struct tomoyo_domain_info * 1081b69a54eeSKentaro Takeda const domain, u8 operation, 1082b69a54eeSKentaro Takeda const struct tomoyo_path_info * 1083b69a54eeSKentaro Takeda filename, const u8 mode) 1084b69a54eeSKentaro Takeda { 1085b69a54eeSKentaro Takeda const char *msg; 1086b69a54eeSKentaro Takeda int error; 1087b69a54eeSKentaro Takeda const bool is_enforce = (mode == 3); 1088b69a54eeSKentaro Takeda 1089b69a54eeSKentaro Takeda if (!mode) 1090b69a54eeSKentaro Takeda return 0; 1091b69a54eeSKentaro Takeda next: 1092b69a54eeSKentaro Takeda error = tomoyo_check_single_path_acl(domain, operation, filename); 1093b69a54eeSKentaro Takeda msg = tomoyo_sp2keyword(operation); 1094b69a54eeSKentaro Takeda if (!error) 1095b69a54eeSKentaro Takeda goto ok; 1096b69a54eeSKentaro Takeda if (tomoyo_verbose_mode(domain)) 1097b69a54eeSKentaro Takeda printk(KERN_WARNING "TOMOYO-%s: Access '%s %s' denied for %s\n", 1098b69a54eeSKentaro Takeda tomoyo_get_msg(is_enforce), msg, filename->name, 1099b69a54eeSKentaro Takeda tomoyo_get_last_name(domain)); 1100b69a54eeSKentaro Takeda if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) { 1101b69a54eeSKentaro Takeda const char *name = tomoyo_get_file_pattern(filename)->name; 1102b69a54eeSKentaro Takeda tomoyo_update_single_path_acl(operation, name, domain, false); 1103b69a54eeSKentaro Takeda } 1104b69a54eeSKentaro Takeda if (!is_enforce) 1105b69a54eeSKentaro Takeda error = 0; 1106b69a54eeSKentaro Takeda ok: 1107b69a54eeSKentaro Takeda /* 1108b69a54eeSKentaro Takeda * Since "allow_truncate" doesn't imply "allow_rewrite" permission, 1109b69a54eeSKentaro Takeda * we need to check "allow_rewrite" permission if the filename is 1110b69a54eeSKentaro Takeda * specified by "deny_rewrite" keyword. 1111b69a54eeSKentaro Takeda */ 1112b69a54eeSKentaro Takeda if (!error && operation == TOMOYO_TYPE_TRUNCATE_ACL && 1113b69a54eeSKentaro Takeda tomoyo_is_no_rewrite_file(filename)) { 1114b69a54eeSKentaro Takeda operation = TOMOYO_TYPE_REWRITE_ACL; 1115b69a54eeSKentaro Takeda goto next; 1116b69a54eeSKentaro Takeda } 1117b69a54eeSKentaro Takeda return error; 1118b69a54eeSKentaro Takeda } 1119b69a54eeSKentaro Takeda 1120b69a54eeSKentaro Takeda /** 1121b69a54eeSKentaro Takeda * tomoyo_check_exec_perm - Check permission for "execute". 1122b69a54eeSKentaro Takeda * 1123b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 1124b69a54eeSKentaro Takeda * @filename: Check permission for "execute". 1125b69a54eeSKentaro Takeda * 1126b69a54eeSKentaro Takeda * Returns 0 on success, negativevalue otherwise. 1127fdb8ebb7STetsuo Handa * 1128fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 1129b69a54eeSKentaro Takeda */ 1130b69a54eeSKentaro Takeda int tomoyo_check_exec_perm(struct tomoyo_domain_info *domain, 1131bcb86975STetsuo Handa const struct tomoyo_path_info *filename) 1132b69a54eeSKentaro Takeda { 1133b69a54eeSKentaro Takeda const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); 1134b69a54eeSKentaro Takeda 1135b69a54eeSKentaro Takeda if (!mode) 1136b69a54eeSKentaro Takeda return 0; 1137b69a54eeSKentaro Takeda return tomoyo_check_file_perm2(domain, filename, 1, "do_execve", mode); 1138b69a54eeSKentaro Takeda } 1139b69a54eeSKentaro Takeda 1140b69a54eeSKentaro Takeda /** 1141b69a54eeSKentaro Takeda * tomoyo_check_open_permission - Check permission for "read" and "write". 1142b69a54eeSKentaro Takeda * 1143b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 1144b69a54eeSKentaro Takeda * @path: Pointer to "struct path". 1145b69a54eeSKentaro Takeda * @flag: Flags for open(). 1146b69a54eeSKentaro Takeda * 1147b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 1148b69a54eeSKentaro Takeda */ 1149b69a54eeSKentaro Takeda int tomoyo_check_open_permission(struct tomoyo_domain_info *domain, 1150b69a54eeSKentaro Takeda struct path *path, const int flag) 1151b69a54eeSKentaro Takeda { 1152b69a54eeSKentaro Takeda const u8 acc_mode = ACC_MODE(flag); 1153b69a54eeSKentaro Takeda int error = -ENOMEM; 1154b69a54eeSKentaro Takeda struct tomoyo_path_info *buf; 1155b69a54eeSKentaro Takeda const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); 1156b69a54eeSKentaro Takeda const bool is_enforce = (mode == 3); 1157fdb8ebb7STetsuo Handa int idx; 1158b69a54eeSKentaro Takeda 1159b69a54eeSKentaro Takeda if (!mode || !path->mnt) 1160b69a54eeSKentaro Takeda return 0; 1161b69a54eeSKentaro Takeda if (acc_mode == 0) 1162b69a54eeSKentaro Takeda return 0; 1163b69a54eeSKentaro Takeda if (path->dentry->d_inode && S_ISDIR(path->dentry->d_inode->i_mode)) 1164b69a54eeSKentaro Takeda /* 1165b69a54eeSKentaro Takeda * I don't check directories here because mkdir() and rmdir() 1166b69a54eeSKentaro Takeda * don't call me. 1167b69a54eeSKentaro Takeda */ 1168b69a54eeSKentaro Takeda return 0; 1169fdb8ebb7STetsuo Handa idx = tomoyo_read_lock(); 1170b69a54eeSKentaro Takeda buf = tomoyo_get_path(path); 1171b69a54eeSKentaro Takeda if (!buf) 1172b69a54eeSKentaro Takeda goto out; 1173b69a54eeSKentaro Takeda error = 0; 1174b69a54eeSKentaro Takeda /* 1175b69a54eeSKentaro Takeda * If the filename is specified by "deny_rewrite" keyword, 1176b69a54eeSKentaro Takeda * we need to check "allow_rewrite" permission when the filename is not 1177b69a54eeSKentaro Takeda * opened for append mode or the filename is truncated at open time. 1178b69a54eeSKentaro Takeda */ 1179b69a54eeSKentaro Takeda if ((acc_mode & MAY_WRITE) && 1180b69a54eeSKentaro Takeda ((flag & O_TRUNC) || !(flag & O_APPEND)) && 1181b69a54eeSKentaro Takeda (tomoyo_is_no_rewrite_file(buf))) { 1182b69a54eeSKentaro Takeda error = tomoyo_check_single_path_permission2(domain, 1183b69a54eeSKentaro Takeda TOMOYO_TYPE_REWRITE_ACL, 1184b69a54eeSKentaro Takeda buf, mode); 1185b69a54eeSKentaro Takeda } 1186b69a54eeSKentaro Takeda if (!error) 1187b69a54eeSKentaro Takeda error = tomoyo_check_file_perm2(domain, buf, acc_mode, "open", 1188b69a54eeSKentaro Takeda mode); 1189b69a54eeSKentaro Takeda if (!error && (flag & O_TRUNC)) 1190b69a54eeSKentaro Takeda error = tomoyo_check_single_path_permission2(domain, 1191b69a54eeSKentaro Takeda TOMOYO_TYPE_TRUNCATE_ACL, 1192b69a54eeSKentaro Takeda buf, mode); 1193b69a54eeSKentaro Takeda out: 11948e2d39a1STetsuo Handa kfree(buf); 1195fdb8ebb7STetsuo Handa tomoyo_read_unlock(idx); 1196b69a54eeSKentaro Takeda if (!is_enforce) 1197b69a54eeSKentaro Takeda error = 0; 1198b69a54eeSKentaro Takeda return error; 1199b69a54eeSKentaro Takeda } 1200b69a54eeSKentaro Takeda 1201b69a54eeSKentaro Takeda /** 1202937bf613STetsuo Handa * tomoyo_check_1path_perm - Check permission for "create", "unlink", "mkdir", "rmdir", "mkfifo", "mksock", "mkblock", "mkchar", "truncate", "symlink", "ioctl", "chmod", "chown", "chgrp", "chroot", "mount" and "unmount". 1203b69a54eeSKentaro Takeda * 1204b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 1205b69a54eeSKentaro Takeda * @operation: Type of operation. 1206b69a54eeSKentaro Takeda * @path: Pointer to "struct path". 1207b69a54eeSKentaro Takeda * 1208b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 1209b69a54eeSKentaro Takeda */ 1210b69a54eeSKentaro Takeda int tomoyo_check_1path_perm(struct tomoyo_domain_info *domain, 1211b69a54eeSKentaro Takeda const u8 operation, struct path *path) 1212b69a54eeSKentaro Takeda { 1213b69a54eeSKentaro Takeda int error = -ENOMEM; 1214b69a54eeSKentaro Takeda struct tomoyo_path_info *buf; 1215b69a54eeSKentaro Takeda const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); 1216b69a54eeSKentaro Takeda const bool is_enforce = (mode == 3); 1217fdb8ebb7STetsuo Handa int idx; 1218b69a54eeSKentaro Takeda 1219b69a54eeSKentaro Takeda if (!mode || !path->mnt) 1220b69a54eeSKentaro Takeda return 0; 1221fdb8ebb7STetsuo Handa idx = tomoyo_read_lock(); 1222b69a54eeSKentaro Takeda buf = tomoyo_get_path(path); 1223b69a54eeSKentaro Takeda if (!buf) 1224b69a54eeSKentaro Takeda goto out; 1225b69a54eeSKentaro Takeda switch (operation) { 1226b69a54eeSKentaro Takeda case TOMOYO_TYPE_MKDIR_ACL: 1227b69a54eeSKentaro Takeda case TOMOYO_TYPE_RMDIR_ACL: 1228937bf613STetsuo Handa case TOMOYO_TYPE_CHROOT_ACL: 1229b69a54eeSKentaro Takeda if (!buf->is_dir) { 1230b69a54eeSKentaro Takeda /* 1231b69a54eeSKentaro Takeda * tomoyo_get_path() reserves space for appending "/." 1232b69a54eeSKentaro Takeda */ 1233b69a54eeSKentaro Takeda strcat((char *) buf->name, "/"); 1234b69a54eeSKentaro Takeda tomoyo_fill_path_info(buf); 1235b69a54eeSKentaro Takeda } 1236b69a54eeSKentaro Takeda } 1237b69a54eeSKentaro Takeda error = tomoyo_check_single_path_permission2(domain, operation, buf, 1238b69a54eeSKentaro Takeda mode); 1239b69a54eeSKentaro Takeda out: 12408e2d39a1STetsuo Handa kfree(buf); 1241fdb8ebb7STetsuo Handa tomoyo_read_unlock(idx); 1242b69a54eeSKentaro Takeda if (!is_enforce) 1243b69a54eeSKentaro Takeda error = 0; 1244b69a54eeSKentaro Takeda return error; 1245b69a54eeSKentaro Takeda } 1246b69a54eeSKentaro Takeda 1247b69a54eeSKentaro Takeda /** 1248b69a54eeSKentaro Takeda * tomoyo_check_rewrite_permission - Check permission for "rewrite". 1249b69a54eeSKentaro Takeda * 1250b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 1251b69a54eeSKentaro Takeda * @filp: Pointer to "struct file". 1252b69a54eeSKentaro Takeda * 1253b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 1254b69a54eeSKentaro Takeda */ 1255b69a54eeSKentaro Takeda int tomoyo_check_rewrite_permission(struct tomoyo_domain_info *domain, 1256b69a54eeSKentaro Takeda struct file *filp) 1257b69a54eeSKentaro Takeda { 1258b69a54eeSKentaro Takeda int error = -ENOMEM; 1259b69a54eeSKentaro Takeda const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); 1260b69a54eeSKentaro Takeda const bool is_enforce = (mode == 3); 1261b69a54eeSKentaro Takeda struct tomoyo_path_info *buf; 1262fdb8ebb7STetsuo Handa int idx; 1263b69a54eeSKentaro Takeda 1264b69a54eeSKentaro Takeda if (!mode || !filp->f_path.mnt) 1265b69a54eeSKentaro Takeda return 0; 1266fdb8ebb7STetsuo Handa 1267fdb8ebb7STetsuo Handa idx = tomoyo_read_lock(); 1268b69a54eeSKentaro Takeda buf = tomoyo_get_path(&filp->f_path); 1269b69a54eeSKentaro Takeda if (!buf) 1270b69a54eeSKentaro Takeda goto out; 1271b69a54eeSKentaro Takeda if (!tomoyo_is_no_rewrite_file(buf)) { 1272b69a54eeSKentaro Takeda error = 0; 1273b69a54eeSKentaro Takeda goto out; 1274b69a54eeSKentaro Takeda } 1275b69a54eeSKentaro Takeda error = tomoyo_check_single_path_permission2(domain, 1276b69a54eeSKentaro Takeda TOMOYO_TYPE_REWRITE_ACL, 1277b69a54eeSKentaro Takeda buf, mode); 1278b69a54eeSKentaro Takeda out: 12798e2d39a1STetsuo Handa kfree(buf); 1280fdb8ebb7STetsuo Handa tomoyo_read_unlock(idx); 1281b69a54eeSKentaro Takeda if (!is_enforce) 1282b69a54eeSKentaro Takeda error = 0; 1283b69a54eeSKentaro Takeda return error; 1284b69a54eeSKentaro Takeda } 1285b69a54eeSKentaro Takeda 1286b69a54eeSKentaro Takeda /** 1287937bf613STetsuo Handa * tomoyo_check_2path_perm - Check permission for "rename", "link" and "pivot_root". 1288b69a54eeSKentaro Takeda * 1289b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 1290b69a54eeSKentaro Takeda * @operation: Type of operation. 1291b69a54eeSKentaro Takeda * @path1: Pointer to "struct path". 1292b69a54eeSKentaro Takeda * @path2: Pointer to "struct path". 1293b69a54eeSKentaro Takeda * 1294b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 1295b69a54eeSKentaro Takeda */ 1296b69a54eeSKentaro Takeda int tomoyo_check_2path_perm(struct tomoyo_domain_info * const domain, 1297b69a54eeSKentaro Takeda const u8 operation, struct path *path1, 1298b69a54eeSKentaro Takeda struct path *path2) 1299b69a54eeSKentaro Takeda { 1300b69a54eeSKentaro Takeda int error = -ENOMEM; 1301b69a54eeSKentaro Takeda struct tomoyo_path_info *buf1, *buf2; 1302b69a54eeSKentaro Takeda const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); 1303b69a54eeSKentaro Takeda const bool is_enforce = (mode == 3); 1304b69a54eeSKentaro Takeda const char *msg; 1305fdb8ebb7STetsuo Handa int idx; 1306b69a54eeSKentaro Takeda 1307b69a54eeSKentaro Takeda if (!mode || !path1->mnt || !path2->mnt) 1308b69a54eeSKentaro Takeda return 0; 1309fdb8ebb7STetsuo Handa idx = tomoyo_read_lock(); 1310b69a54eeSKentaro Takeda buf1 = tomoyo_get_path(path1); 1311b69a54eeSKentaro Takeda buf2 = tomoyo_get_path(path2); 1312b69a54eeSKentaro Takeda if (!buf1 || !buf2) 1313b69a54eeSKentaro Takeda goto out; 1314b69a54eeSKentaro Takeda { 1315b69a54eeSKentaro Takeda struct dentry *dentry = path1->dentry; 1316b69a54eeSKentaro Takeda if (dentry->d_inode && S_ISDIR(dentry->d_inode->i_mode)) { 1317b69a54eeSKentaro Takeda /* 1318b69a54eeSKentaro Takeda * tomoyo_get_path() reserves space for appending "/." 1319b69a54eeSKentaro Takeda */ 1320b69a54eeSKentaro Takeda if (!buf1->is_dir) { 1321b69a54eeSKentaro Takeda strcat((char *) buf1->name, "/"); 1322b69a54eeSKentaro Takeda tomoyo_fill_path_info(buf1); 1323b69a54eeSKentaro Takeda } 1324b69a54eeSKentaro Takeda if (!buf2->is_dir) { 1325b69a54eeSKentaro Takeda strcat((char *) buf2->name, "/"); 1326b69a54eeSKentaro Takeda tomoyo_fill_path_info(buf2); 1327b69a54eeSKentaro Takeda } 1328b69a54eeSKentaro Takeda } 1329b69a54eeSKentaro Takeda } 1330b69a54eeSKentaro Takeda error = tomoyo_check_double_path_acl(domain, operation, buf1, buf2); 1331b69a54eeSKentaro Takeda msg = tomoyo_dp2keyword(operation); 1332b69a54eeSKentaro Takeda if (!error) 1333b69a54eeSKentaro Takeda goto out; 1334b69a54eeSKentaro Takeda if (tomoyo_verbose_mode(domain)) 1335b69a54eeSKentaro Takeda printk(KERN_WARNING "TOMOYO-%s: Access '%s %s %s' " 1336b69a54eeSKentaro Takeda "denied for %s\n", tomoyo_get_msg(is_enforce), 1337b69a54eeSKentaro Takeda msg, buf1->name, buf2->name, 1338b69a54eeSKentaro Takeda tomoyo_get_last_name(domain)); 1339b69a54eeSKentaro Takeda if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) { 1340b69a54eeSKentaro Takeda const char *name1 = tomoyo_get_file_pattern(buf1)->name; 1341b69a54eeSKentaro Takeda const char *name2 = tomoyo_get_file_pattern(buf2)->name; 1342b69a54eeSKentaro Takeda tomoyo_update_double_path_acl(operation, name1, name2, domain, 1343b69a54eeSKentaro Takeda false); 1344b69a54eeSKentaro Takeda } 1345b69a54eeSKentaro Takeda out: 13468e2d39a1STetsuo Handa kfree(buf1); 13478e2d39a1STetsuo Handa kfree(buf2); 1348fdb8ebb7STetsuo Handa tomoyo_read_unlock(idx); 1349b69a54eeSKentaro Takeda if (!is_enforce) 1350b69a54eeSKentaro Takeda error = 0; 1351b69a54eeSKentaro Takeda return error; 1352b69a54eeSKentaro Takeda } 1353