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 { 218b69a54eeSKentaro Takeda struct tomoyo_globally_readable_file_entry *new_entry; 219b69a54eeSKentaro Takeda struct tomoyo_globally_readable_file_entry *ptr; 220b69a54eeSKentaro Takeda const struct tomoyo_path_info *saved_filename; 221b69a54eeSKentaro Takeda int error = -ENOMEM; 222b69a54eeSKentaro Takeda 223b69a54eeSKentaro Takeda if (!tomoyo_is_correct_path(filename, 1, 0, -1, __func__)) 224b69a54eeSKentaro Takeda return -EINVAL; 225b69a54eeSKentaro Takeda saved_filename = tomoyo_save_name(filename); 226b69a54eeSKentaro Takeda if (!saved_filename) 227b69a54eeSKentaro Takeda return -ENOMEM; 228cd7bec6aSTetsuo Handa new_entry = kmalloc(sizeof(*new_entry), GFP_KERNEL); 229f737d95dSTetsuo Handa mutex_lock(&tomoyo_policy_lock); 230fdb8ebb7STetsuo Handa list_for_each_entry_rcu(ptr, &tomoyo_globally_readable_list, list) { 231b69a54eeSKentaro Takeda if (ptr->filename != saved_filename) 232b69a54eeSKentaro Takeda continue; 233b69a54eeSKentaro Takeda ptr->is_deleted = is_delete; 234b69a54eeSKentaro Takeda error = 0; 235b69a54eeSKentaro Takeda goto out; 236b69a54eeSKentaro Takeda } 237b69a54eeSKentaro Takeda if (is_delete) { 238b69a54eeSKentaro Takeda error = -ENOENT; 239b69a54eeSKentaro Takeda goto out; 240b69a54eeSKentaro Takeda } 241cd7bec6aSTetsuo Handa if (!tomoyo_memory_ok(new_entry)) 242b69a54eeSKentaro Takeda goto out; 243b69a54eeSKentaro Takeda new_entry->filename = saved_filename; 244fdb8ebb7STetsuo Handa list_add_tail_rcu(&new_entry->list, &tomoyo_globally_readable_list); 245cd7bec6aSTetsuo Handa new_entry = NULL; 246b69a54eeSKentaro Takeda error = 0; 247b69a54eeSKentaro Takeda out: 248f737d95dSTetsuo Handa mutex_unlock(&tomoyo_policy_lock); 249cd7bec6aSTetsuo Handa kfree(new_entry); 250b69a54eeSKentaro Takeda return error; 251b69a54eeSKentaro Takeda } 252b69a54eeSKentaro Takeda 253b69a54eeSKentaro Takeda /** 254b69a54eeSKentaro Takeda * tomoyo_is_globally_readable_file - Check if the file is unconditionnaly permitted to be open()ed for reading. 255b69a54eeSKentaro Takeda * 256b69a54eeSKentaro Takeda * @filename: The filename to check. 257b69a54eeSKentaro Takeda * 258b69a54eeSKentaro Takeda * Returns true if any domain can open @filename for reading, false otherwise. 259fdb8ebb7STetsuo Handa * 260fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 261b69a54eeSKentaro Takeda */ 262b69a54eeSKentaro Takeda static bool tomoyo_is_globally_readable_file(const struct tomoyo_path_info * 263b69a54eeSKentaro Takeda filename) 264b69a54eeSKentaro Takeda { 265b69a54eeSKentaro Takeda struct tomoyo_globally_readable_file_entry *ptr; 266b69a54eeSKentaro Takeda bool found = false; 267fdb8ebb7STetsuo Handa 268fdb8ebb7STetsuo Handa list_for_each_entry_rcu(ptr, &tomoyo_globally_readable_list, list) { 269b69a54eeSKentaro Takeda if (!ptr->is_deleted && 270b69a54eeSKentaro Takeda tomoyo_path_matches_pattern(filename, ptr->filename)) { 271b69a54eeSKentaro Takeda found = true; 272b69a54eeSKentaro Takeda break; 273b69a54eeSKentaro Takeda } 274b69a54eeSKentaro Takeda } 275b69a54eeSKentaro Takeda return found; 276b69a54eeSKentaro Takeda } 277b69a54eeSKentaro Takeda 278b69a54eeSKentaro Takeda /** 279b69a54eeSKentaro Takeda * tomoyo_write_globally_readable_policy - Write "struct tomoyo_globally_readable_file_entry" list. 280b69a54eeSKentaro Takeda * 281b69a54eeSKentaro Takeda * @data: String to parse. 282b69a54eeSKentaro Takeda * @is_delete: True if it is a delete request. 283b69a54eeSKentaro Takeda * 284b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 285fdb8ebb7STetsuo Handa * 286fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 287b69a54eeSKentaro Takeda */ 288b69a54eeSKentaro Takeda int tomoyo_write_globally_readable_policy(char *data, const bool is_delete) 289b69a54eeSKentaro Takeda { 290b69a54eeSKentaro Takeda return tomoyo_update_globally_readable_entry(data, is_delete); 291b69a54eeSKentaro Takeda } 292b69a54eeSKentaro Takeda 293b69a54eeSKentaro Takeda /** 294b69a54eeSKentaro Takeda * tomoyo_read_globally_readable_policy - Read "struct tomoyo_globally_readable_file_entry" list. 295b69a54eeSKentaro Takeda * 296b69a54eeSKentaro Takeda * @head: Pointer to "struct tomoyo_io_buffer". 297b69a54eeSKentaro Takeda * 298b69a54eeSKentaro Takeda * Returns true on success, false otherwise. 299fdb8ebb7STetsuo Handa * 300fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 301b69a54eeSKentaro Takeda */ 302b69a54eeSKentaro Takeda bool tomoyo_read_globally_readable_policy(struct tomoyo_io_buffer *head) 303b69a54eeSKentaro Takeda { 304b69a54eeSKentaro Takeda struct list_head *pos; 305b69a54eeSKentaro Takeda bool done = true; 306b69a54eeSKentaro Takeda 307b69a54eeSKentaro Takeda list_for_each_cookie(pos, head->read_var2, 308b69a54eeSKentaro Takeda &tomoyo_globally_readable_list) { 309b69a54eeSKentaro Takeda struct tomoyo_globally_readable_file_entry *ptr; 310b69a54eeSKentaro Takeda ptr = list_entry(pos, 311b69a54eeSKentaro Takeda struct tomoyo_globally_readable_file_entry, 312b69a54eeSKentaro Takeda list); 313b69a54eeSKentaro Takeda if (ptr->is_deleted) 314b69a54eeSKentaro Takeda continue; 3157d2948b1STetsuo Handa done = tomoyo_io_printf(head, TOMOYO_KEYWORD_ALLOW_READ "%s\n", 3167d2948b1STetsuo Handa ptr->filename->name); 3177d2948b1STetsuo Handa if (!done) 318b69a54eeSKentaro Takeda break; 319b69a54eeSKentaro Takeda } 320b69a54eeSKentaro Takeda return done; 321b69a54eeSKentaro Takeda } 322b69a54eeSKentaro Takeda 323c3fa109aSTetsuo Handa /* tomoyo_pattern_list is used for holding list of pathnames which are used for 324c3fa109aSTetsuo Handa * converting pathnames to pathname patterns during learning mode. 325c3fa109aSTetsuo Handa * 326c3fa109aSTetsuo Handa * An entry is added by 327c3fa109aSTetsuo Handa * 328c3fa109aSTetsuo Handa * # echo 'file_pattern /proc/\$/mounts' > \ 329c3fa109aSTetsuo Handa * /sys/kernel/security/tomoyo/exception_policy 330c3fa109aSTetsuo Handa * 331c3fa109aSTetsuo Handa * and is deleted by 332c3fa109aSTetsuo Handa * 333c3fa109aSTetsuo Handa * # echo 'delete file_pattern /proc/\$/mounts' > \ 334c3fa109aSTetsuo Handa * /sys/kernel/security/tomoyo/exception_policy 335c3fa109aSTetsuo Handa * 336c3fa109aSTetsuo Handa * and all entries are retrieved by 337c3fa109aSTetsuo Handa * 338c3fa109aSTetsuo Handa * # grep ^file_pattern /sys/kernel/security/tomoyo/exception_policy 339c3fa109aSTetsuo Handa * 340c3fa109aSTetsuo Handa * In the example above, if a process which belongs to a domain which is in 341c3fa109aSTetsuo Handa * learning mode requested open("/proc/1/mounts", O_RDONLY), 342c3fa109aSTetsuo Handa * "allow_read /proc/\$/mounts" is automatically added to the domain which that 343c3fa109aSTetsuo Handa * process belongs to. 344c3fa109aSTetsuo Handa * 345c3fa109aSTetsuo Handa * It is not a desirable behavior that we have to use /proc/\$/ instead of 346c3fa109aSTetsuo Handa * /proc/self/ when current process needs to access only current process's 347c3fa109aSTetsuo Handa * information. As of now, LSM version of TOMOYO is using __d_path() for 348c3fa109aSTetsuo Handa * calculating pathname. Non LSM version of TOMOYO is using its own function 349c3fa109aSTetsuo Handa * which pretends as if /proc/self/ is not a symlink; so that we can forbid 350c3fa109aSTetsuo Handa * current process from accessing other process's information. 351c3fa109aSTetsuo Handa */ 352b69a54eeSKentaro Takeda static LIST_HEAD(tomoyo_pattern_list); 353b69a54eeSKentaro Takeda 354b69a54eeSKentaro Takeda /** 355b69a54eeSKentaro Takeda * tomoyo_update_file_pattern_entry - Update "struct tomoyo_pattern_entry" list. 356b69a54eeSKentaro Takeda * 357b69a54eeSKentaro Takeda * @pattern: Pathname pattern. 358b69a54eeSKentaro Takeda * @is_delete: True if it is a delete request. 359b69a54eeSKentaro Takeda * 360b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 361fdb8ebb7STetsuo Handa * 362fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 363b69a54eeSKentaro Takeda */ 364b69a54eeSKentaro Takeda static int tomoyo_update_file_pattern_entry(const char *pattern, 365b69a54eeSKentaro Takeda const bool is_delete) 366b69a54eeSKentaro Takeda { 367b69a54eeSKentaro Takeda struct tomoyo_pattern_entry *new_entry; 368b69a54eeSKentaro Takeda struct tomoyo_pattern_entry *ptr; 369b69a54eeSKentaro Takeda const struct tomoyo_path_info *saved_pattern; 370b69a54eeSKentaro Takeda int error = -ENOMEM; 371b69a54eeSKentaro Takeda 372b69a54eeSKentaro Takeda if (!tomoyo_is_correct_path(pattern, 0, 1, 0, __func__)) 373b69a54eeSKentaro Takeda return -EINVAL; 374b69a54eeSKentaro Takeda saved_pattern = tomoyo_save_name(pattern); 375b69a54eeSKentaro Takeda if (!saved_pattern) 376b69a54eeSKentaro Takeda return -ENOMEM; 377cd7bec6aSTetsuo Handa new_entry = kmalloc(sizeof(*new_entry), GFP_KERNEL); 378f737d95dSTetsuo Handa mutex_lock(&tomoyo_policy_lock); 379fdb8ebb7STetsuo Handa list_for_each_entry_rcu(ptr, &tomoyo_pattern_list, list) { 380b69a54eeSKentaro Takeda if (saved_pattern != ptr->pattern) 381b69a54eeSKentaro Takeda continue; 382b69a54eeSKentaro Takeda ptr->is_deleted = is_delete; 383b69a54eeSKentaro Takeda error = 0; 384b69a54eeSKentaro Takeda goto out; 385b69a54eeSKentaro Takeda } 386b69a54eeSKentaro Takeda if (is_delete) { 387b69a54eeSKentaro Takeda error = -ENOENT; 388b69a54eeSKentaro Takeda goto out; 389b69a54eeSKentaro Takeda } 390cd7bec6aSTetsuo Handa if (!tomoyo_memory_ok(new_entry)) 391b69a54eeSKentaro Takeda goto out; 392b69a54eeSKentaro Takeda new_entry->pattern = saved_pattern; 393fdb8ebb7STetsuo Handa list_add_tail_rcu(&new_entry->list, &tomoyo_pattern_list); 394cd7bec6aSTetsuo Handa new_entry = NULL; 395b69a54eeSKentaro Takeda error = 0; 396b69a54eeSKentaro Takeda out: 397f737d95dSTetsuo Handa mutex_unlock(&tomoyo_policy_lock); 398cd7bec6aSTetsuo Handa kfree(new_entry); 399b69a54eeSKentaro Takeda return error; 400b69a54eeSKentaro Takeda } 401b69a54eeSKentaro Takeda 402b69a54eeSKentaro Takeda /** 403b69a54eeSKentaro Takeda * tomoyo_get_file_pattern - Get patterned pathname. 404b69a54eeSKentaro Takeda * 405b69a54eeSKentaro Takeda * @filename: The filename to find patterned pathname. 406b69a54eeSKentaro Takeda * 407b69a54eeSKentaro Takeda * Returns pointer to pathname pattern if matched, @filename otherwise. 408fdb8ebb7STetsuo Handa * 409fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 410b69a54eeSKentaro Takeda */ 411b69a54eeSKentaro Takeda static const struct tomoyo_path_info * 412b69a54eeSKentaro Takeda tomoyo_get_file_pattern(const struct tomoyo_path_info *filename) 413b69a54eeSKentaro Takeda { 414b69a54eeSKentaro Takeda struct tomoyo_pattern_entry *ptr; 415b69a54eeSKentaro Takeda const struct tomoyo_path_info *pattern = NULL; 416b69a54eeSKentaro Takeda 417fdb8ebb7STetsuo Handa list_for_each_entry_rcu(ptr, &tomoyo_pattern_list, list) { 418b69a54eeSKentaro Takeda if (ptr->is_deleted) 419b69a54eeSKentaro Takeda continue; 420b69a54eeSKentaro Takeda if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) 421b69a54eeSKentaro Takeda continue; 422b69a54eeSKentaro Takeda pattern = ptr->pattern; 423b69a54eeSKentaro Takeda if (tomoyo_strendswith(pattern->name, "/\\*")) { 424b69a54eeSKentaro Takeda /* Do nothing. Try to find the better match. */ 425b69a54eeSKentaro Takeda } else { 426b69a54eeSKentaro Takeda /* This would be the better match. Use this. */ 427b69a54eeSKentaro Takeda break; 428b69a54eeSKentaro Takeda } 429b69a54eeSKentaro Takeda } 430b69a54eeSKentaro Takeda if (pattern) 431b69a54eeSKentaro Takeda filename = pattern; 432b69a54eeSKentaro Takeda return filename; 433b69a54eeSKentaro Takeda } 434b69a54eeSKentaro Takeda 435b69a54eeSKentaro Takeda /** 436b69a54eeSKentaro Takeda * tomoyo_write_pattern_policy - Write "struct tomoyo_pattern_entry" list. 437b69a54eeSKentaro Takeda * 438b69a54eeSKentaro Takeda * @data: String to parse. 439b69a54eeSKentaro Takeda * @is_delete: True if it is a delete request. 440b69a54eeSKentaro Takeda * 441b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 442fdb8ebb7STetsuo Handa * 443fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 444b69a54eeSKentaro Takeda */ 445b69a54eeSKentaro Takeda int tomoyo_write_pattern_policy(char *data, const bool is_delete) 446b69a54eeSKentaro Takeda { 447b69a54eeSKentaro Takeda return tomoyo_update_file_pattern_entry(data, is_delete); 448b69a54eeSKentaro Takeda } 449b69a54eeSKentaro Takeda 450b69a54eeSKentaro Takeda /** 451b69a54eeSKentaro Takeda * tomoyo_read_file_pattern - Read "struct tomoyo_pattern_entry" list. 452b69a54eeSKentaro Takeda * 453b69a54eeSKentaro Takeda * @head: Pointer to "struct tomoyo_io_buffer". 454b69a54eeSKentaro Takeda * 455b69a54eeSKentaro Takeda * Returns true on success, false otherwise. 456fdb8ebb7STetsuo Handa * 457fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 458b69a54eeSKentaro Takeda */ 459b69a54eeSKentaro Takeda bool tomoyo_read_file_pattern(struct tomoyo_io_buffer *head) 460b69a54eeSKentaro Takeda { 461b69a54eeSKentaro Takeda struct list_head *pos; 462b69a54eeSKentaro Takeda bool done = true; 463b69a54eeSKentaro Takeda 464b69a54eeSKentaro Takeda list_for_each_cookie(pos, head->read_var2, &tomoyo_pattern_list) { 465b69a54eeSKentaro Takeda struct tomoyo_pattern_entry *ptr; 466b69a54eeSKentaro Takeda ptr = list_entry(pos, struct tomoyo_pattern_entry, list); 467b69a54eeSKentaro Takeda if (ptr->is_deleted) 468b69a54eeSKentaro Takeda continue; 4697d2948b1STetsuo Handa done = tomoyo_io_printf(head, TOMOYO_KEYWORD_FILE_PATTERN 4707d2948b1STetsuo Handa "%s\n", ptr->pattern->name); 4717d2948b1STetsuo Handa if (!done) 472b69a54eeSKentaro Takeda break; 473b69a54eeSKentaro Takeda } 474b69a54eeSKentaro Takeda return done; 475b69a54eeSKentaro Takeda } 476b69a54eeSKentaro Takeda 477c3fa109aSTetsuo Handa /* 478c3fa109aSTetsuo Handa * tomoyo_no_rewrite_list is used for holding list of pathnames which are by 479c3fa109aSTetsuo Handa * default forbidden to modify already written content of a file. 480c3fa109aSTetsuo Handa * 481c3fa109aSTetsuo Handa * An entry is added by 482c3fa109aSTetsuo Handa * 483c3fa109aSTetsuo Handa * # echo 'deny_rewrite /var/log/messages' > \ 484c3fa109aSTetsuo Handa * /sys/kernel/security/tomoyo/exception_policy 485c3fa109aSTetsuo Handa * 486c3fa109aSTetsuo Handa * and is deleted by 487c3fa109aSTetsuo Handa * 488c3fa109aSTetsuo Handa * # echo 'delete deny_rewrite /var/log/messages' > \ 489c3fa109aSTetsuo Handa * /sys/kernel/security/tomoyo/exception_policy 490c3fa109aSTetsuo Handa * 491c3fa109aSTetsuo Handa * and all entries are retrieved by 492c3fa109aSTetsuo Handa * 493c3fa109aSTetsuo Handa * # grep ^deny_rewrite /sys/kernel/security/tomoyo/exception_policy 494c3fa109aSTetsuo Handa * 495c3fa109aSTetsuo Handa * In the example above, if a process requested to rewrite /var/log/messages , 496c3fa109aSTetsuo Handa * the process can't rewrite unless the domain which that process belongs to 497c3fa109aSTetsuo Handa * has "allow_rewrite /var/log/messages" entry. 498c3fa109aSTetsuo Handa * 499c3fa109aSTetsuo Handa * It is not a desirable behavior that we have to add "\040(deleted)" suffix 500c3fa109aSTetsuo Handa * when we want to allow rewriting already unlink()ed file. As of now, 501c3fa109aSTetsuo Handa * LSM version of TOMOYO is using __d_path() for calculating pathname. 502c3fa109aSTetsuo Handa * Non LSM version of TOMOYO is using its own function which doesn't append 503c3fa109aSTetsuo Handa * " (deleted)" suffix if the file is already unlink()ed; so that we don't 504c3fa109aSTetsuo Handa * need to worry whether the file is already unlink()ed or not. 505c3fa109aSTetsuo Handa */ 506b69a54eeSKentaro Takeda static LIST_HEAD(tomoyo_no_rewrite_list); 507b69a54eeSKentaro Takeda 508b69a54eeSKentaro Takeda /** 509b69a54eeSKentaro Takeda * tomoyo_update_no_rewrite_entry - Update "struct tomoyo_no_rewrite_entry" list. 510b69a54eeSKentaro Takeda * 511b69a54eeSKentaro Takeda * @pattern: Pathname pattern that are not rewritable by default. 512b69a54eeSKentaro Takeda * @is_delete: True if it is a delete request. 513b69a54eeSKentaro Takeda * 514b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 515fdb8ebb7STetsuo Handa * 516fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 517b69a54eeSKentaro Takeda */ 518b69a54eeSKentaro Takeda static int tomoyo_update_no_rewrite_entry(const char *pattern, 519b69a54eeSKentaro Takeda const bool is_delete) 520b69a54eeSKentaro Takeda { 521b69a54eeSKentaro Takeda struct tomoyo_no_rewrite_entry *new_entry, *ptr; 522b69a54eeSKentaro Takeda const struct tomoyo_path_info *saved_pattern; 523b69a54eeSKentaro Takeda int error = -ENOMEM; 524b69a54eeSKentaro Takeda 525b69a54eeSKentaro Takeda if (!tomoyo_is_correct_path(pattern, 0, 0, 0, __func__)) 526b69a54eeSKentaro Takeda return -EINVAL; 527b69a54eeSKentaro Takeda saved_pattern = tomoyo_save_name(pattern); 528b69a54eeSKentaro Takeda if (!saved_pattern) 529b69a54eeSKentaro Takeda return -ENOMEM; 530cd7bec6aSTetsuo Handa new_entry = kmalloc(sizeof(*new_entry), GFP_KERNEL); 531f737d95dSTetsuo Handa mutex_lock(&tomoyo_policy_lock); 532fdb8ebb7STetsuo Handa list_for_each_entry_rcu(ptr, &tomoyo_no_rewrite_list, list) { 533b69a54eeSKentaro Takeda if (ptr->pattern != saved_pattern) 534b69a54eeSKentaro Takeda continue; 535b69a54eeSKentaro Takeda ptr->is_deleted = is_delete; 536b69a54eeSKentaro Takeda error = 0; 537b69a54eeSKentaro Takeda goto out; 538b69a54eeSKentaro Takeda } 539b69a54eeSKentaro Takeda if (is_delete) { 540b69a54eeSKentaro Takeda error = -ENOENT; 541b69a54eeSKentaro Takeda goto out; 542b69a54eeSKentaro Takeda } 543cd7bec6aSTetsuo Handa if (!tomoyo_memory_ok(new_entry)) 544b69a54eeSKentaro Takeda goto out; 545b69a54eeSKentaro Takeda new_entry->pattern = saved_pattern; 546fdb8ebb7STetsuo Handa list_add_tail_rcu(&new_entry->list, &tomoyo_no_rewrite_list); 547cd7bec6aSTetsuo Handa new_entry = NULL; 548b69a54eeSKentaro Takeda error = 0; 549b69a54eeSKentaro Takeda out: 550f737d95dSTetsuo Handa mutex_unlock(&tomoyo_policy_lock); 551cd7bec6aSTetsuo Handa kfree(new_entry); 552b69a54eeSKentaro Takeda return error; 553b69a54eeSKentaro Takeda } 554b69a54eeSKentaro Takeda 555b69a54eeSKentaro Takeda /** 556b69a54eeSKentaro Takeda * tomoyo_is_no_rewrite_file - Check if the given pathname is not permitted to be rewrited. 557b69a54eeSKentaro Takeda * 558b69a54eeSKentaro Takeda * @filename: Filename to check. 559b69a54eeSKentaro Takeda * 560b69a54eeSKentaro Takeda * Returns true if @filename is specified by "deny_rewrite" directive, 561b69a54eeSKentaro Takeda * false otherwise. 562fdb8ebb7STetsuo Handa * 563fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 564b69a54eeSKentaro Takeda */ 565b69a54eeSKentaro Takeda static bool tomoyo_is_no_rewrite_file(const struct tomoyo_path_info *filename) 566b69a54eeSKentaro Takeda { 567b69a54eeSKentaro Takeda struct tomoyo_no_rewrite_entry *ptr; 568b69a54eeSKentaro Takeda bool found = false; 569b69a54eeSKentaro Takeda 570fdb8ebb7STetsuo Handa list_for_each_entry_rcu(ptr, &tomoyo_no_rewrite_list, list) { 571b69a54eeSKentaro Takeda if (ptr->is_deleted) 572b69a54eeSKentaro Takeda continue; 573b69a54eeSKentaro Takeda if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) 574b69a54eeSKentaro Takeda continue; 575b69a54eeSKentaro Takeda found = true; 576b69a54eeSKentaro Takeda break; 577b69a54eeSKentaro Takeda } 578b69a54eeSKentaro Takeda return found; 579b69a54eeSKentaro Takeda } 580b69a54eeSKentaro Takeda 581b69a54eeSKentaro Takeda /** 582b69a54eeSKentaro Takeda * tomoyo_write_no_rewrite_policy - Write "struct tomoyo_no_rewrite_entry" list. 583b69a54eeSKentaro Takeda * 584b69a54eeSKentaro Takeda * @data: String to parse. 585b69a54eeSKentaro Takeda * @is_delete: True if it is a delete request. 586b69a54eeSKentaro Takeda * 587b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 588fdb8ebb7STetsuo Handa * 589fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 590b69a54eeSKentaro Takeda */ 591b69a54eeSKentaro Takeda int tomoyo_write_no_rewrite_policy(char *data, const bool is_delete) 592b69a54eeSKentaro Takeda { 593b69a54eeSKentaro Takeda return tomoyo_update_no_rewrite_entry(data, is_delete); 594b69a54eeSKentaro Takeda } 595b69a54eeSKentaro Takeda 596b69a54eeSKentaro Takeda /** 597b69a54eeSKentaro Takeda * tomoyo_read_no_rewrite_policy - Read "struct tomoyo_no_rewrite_entry" list. 598b69a54eeSKentaro Takeda * 599b69a54eeSKentaro Takeda * @head: Pointer to "struct tomoyo_io_buffer". 600b69a54eeSKentaro Takeda * 601b69a54eeSKentaro Takeda * Returns true on success, false otherwise. 602fdb8ebb7STetsuo Handa * 603fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 604b69a54eeSKentaro Takeda */ 605b69a54eeSKentaro Takeda bool tomoyo_read_no_rewrite_policy(struct tomoyo_io_buffer *head) 606b69a54eeSKentaro Takeda { 607b69a54eeSKentaro Takeda struct list_head *pos; 608b69a54eeSKentaro Takeda bool done = true; 609b69a54eeSKentaro Takeda 610b69a54eeSKentaro Takeda list_for_each_cookie(pos, head->read_var2, &tomoyo_no_rewrite_list) { 611b69a54eeSKentaro Takeda struct tomoyo_no_rewrite_entry *ptr; 612b69a54eeSKentaro Takeda ptr = list_entry(pos, struct tomoyo_no_rewrite_entry, list); 613b69a54eeSKentaro Takeda if (ptr->is_deleted) 614b69a54eeSKentaro Takeda continue; 6157d2948b1STetsuo Handa done = tomoyo_io_printf(head, TOMOYO_KEYWORD_DENY_REWRITE 6167d2948b1STetsuo Handa "%s\n", ptr->pattern->name); 6177d2948b1STetsuo Handa if (!done) 618b69a54eeSKentaro Takeda break; 619b69a54eeSKentaro Takeda } 620b69a54eeSKentaro Takeda return done; 621b69a54eeSKentaro Takeda } 622b69a54eeSKentaro Takeda 623b69a54eeSKentaro Takeda /** 624b69a54eeSKentaro Takeda * tomoyo_update_file_acl - Update file's read/write/execute ACL. 625b69a54eeSKentaro Takeda * 626b69a54eeSKentaro Takeda * @filename: Filename. 627b69a54eeSKentaro Takeda * @perm: Permission (between 1 to 7). 628b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 629b69a54eeSKentaro Takeda * @is_delete: True if it is a delete request. 630b69a54eeSKentaro Takeda * 631b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 632b69a54eeSKentaro Takeda * 633b69a54eeSKentaro Takeda * This is legacy support interface for older policy syntax. 634b69a54eeSKentaro Takeda * Current policy syntax uses "allow_read/write" instead of "6", 635b69a54eeSKentaro Takeda * "allow_read" instead of "4", "allow_write" instead of "2", 636b69a54eeSKentaro Takeda * "allow_execute" instead of "1". 637fdb8ebb7STetsuo Handa * 638fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 639b69a54eeSKentaro Takeda */ 640b69a54eeSKentaro Takeda static int tomoyo_update_file_acl(const char *filename, u8 perm, 641b69a54eeSKentaro Takeda struct tomoyo_domain_info * const domain, 642b69a54eeSKentaro Takeda const bool is_delete) 643b69a54eeSKentaro Takeda { 644b69a54eeSKentaro Takeda if (perm > 7 || !perm) { 645b69a54eeSKentaro Takeda printk(KERN_DEBUG "%s: Invalid permission '%d %s'\n", 646b69a54eeSKentaro Takeda __func__, perm, filename); 647b69a54eeSKentaro Takeda return -EINVAL; 648b69a54eeSKentaro Takeda } 649b69a54eeSKentaro Takeda if (filename[0] != '@' && tomoyo_strendswith(filename, "/")) 650b69a54eeSKentaro Takeda /* 651b69a54eeSKentaro Takeda * Only 'allow_mkdir' and 'allow_rmdir' are valid for 652b69a54eeSKentaro Takeda * directory permissions. 653b69a54eeSKentaro Takeda */ 654b69a54eeSKentaro Takeda return 0; 655b69a54eeSKentaro Takeda if (perm & 4) 656b69a54eeSKentaro Takeda tomoyo_update_single_path_acl(TOMOYO_TYPE_READ_ACL, filename, 657b69a54eeSKentaro Takeda domain, is_delete); 658b69a54eeSKentaro Takeda if (perm & 2) 659b69a54eeSKentaro Takeda tomoyo_update_single_path_acl(TOMOYO_TYPE_WRITE_ACL, filename, 660b69a54eeSKentaro Takeda domain, is_delete); 661b69a54eeSKentaro Takeda if (perm & 1) 662b69a54eeSKentaro Takeda tomoyo_update_single_path_acl(TOMOYO_TYPE_EXECUTE_ACL, 663b69a54eeSKentaro Takeda filename, domain, is_delete); 664b69a54eeSKentaro Takeda return 0; 665b69a54eeSKentaro Takeda } 666b69a54eeSKentaro Takeda 667b69a54eeSKentaro Takeda /** 668b69a54eeSKentaro Takeda * tomoyo_check_single_path_acl2 - Check permission for single path operation. 669b69a54eeSKentaro Takeda * 670b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 671b69a54eeSKentaro Takeda * @filename: Filename to check. 672b69a54eeSKentaro Takeda * @perm: Permission. 673b69a54eeSKentaro Takeda * @may_use_pattern: True if patterned ACL is permitted. 674b69a54eeSKentaro Takeda * 675b69a54eeSKentaro Takeda * Returns 0 on success, -EPERM otherwise. 676fdb8ebb7STetsuo Handa * 677fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 678b69a54eeSKentaro Takeda */ 679b69a54eeSKentaro Takeda static int tomoyo_check_single_path_acl2(const struct tomoyo_domain_info * 680b69a54eeSKentaro Takeda domain, 681b69a54eeSKentaro Takeda const struct tomoyo_path_info * 682b69a54eeSKentaro Takeda filename, 683937bf613STetsuo Handa const u32 perm, 684b69a54eeSKentaro Takeda const bool may_use_pattern) 685b69a54eeSKentaro Takeda { 686b69a54eeSKentaro Takeda struct tomoyo_acl_info *ptr; 687b69a54eeSKentaro Takeda int error = -EPERM; 688b69a54eeSKentaro Takeda 689fdb8ebb7STetsuo Handa list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { 690b69a54eeSKentaro Takeda struct tomoyo_single_path_acl_record *acl; 691ea13ddbaSTetsuo Handa if (ptr->type != TOMOYO_TYPE_SINGLE_PATH_ACL) 692b69a54eeSKentaro Takeda continue; 693b69a54eeSKentaro Takeda acl = container_of(ptr, struct tomoyo_single_path_acl_record, 694b69a54eeSKentaro Takeda head); 695937bf613STetsuo Handa if (perm <= 0xFFFF) { 696b69a54eeSKentaro Takeda if (!(acl->perm & perm)) 697b69a54eeSKentaro Takeda continue; 698937bf613STetsuo Handa } else { 699937bf613STetsuo Handa if (!(acl->perm_high & (perm >> 16))) 700937bf613STetsuo Handa continue; 701937bf613STetsuo Handa } 702b69a54eeSKentaro Takeda if (may_use_pattern || !acl->filename->is_patterned) { 703b69a54eeSKentaro Takeda if (!tomoyo_path_matches_pattern(filename, 704b69a54eeSKentaro Takeda acl->filename)) 705b69a54eeSKentaro Takeda continue; 706b69a54eeSKentaro Takeda } else { 707b69a54eeSKentaro Takeda continue; 708b69a54eeSKentaro Takeda } 709b69a54eeSKentaro Takeda error = 0; 710b69a54eeSKentaro Takeda break; 711b69a54eeSKentaro Takeda } 712b69a54eeSKentaro Takeda return error; 713b69a54eeSKentaro Takeda } 714b69a54eeSKentaro Takeda 715b69a54eeSKentaro Takeda /** 716b69a54eeSKentaro Takeda * tomoyo_check_file_acl - Check permission for opening files. 717b69a54eeSKentaro Takeda * 718b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 719b69a54eeSKentaro Takeda * @filename: Filename to check. 720b69a54eeSKentaro Takeda * @operation: Mode ("read" or "write" or "read/write" or "execute"). 721b69a54eeSKentaro Takeda * 722b69a54eeSKentaro Takeda * Returns 0 on success, -EPERM otherwise. 723fdb8ebb7STetsuo Handa * 724fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 725b69a54eeSKentaro Takeda */ 726b69a54eeSKentaro Takeda static int tomoyo_check_file_acl(const struct tomoyo_domain_info *domain, 727b69a54eeSKentaro Takeda const struct tomoyo_path_info *filename, 728b69a54eeSKentaro Takeda const u8 operation) 729b69a54eeSKentaro Takeda { 730937bf613STetsuo Handa u32 perm = 0; 731b69a54eeSKentaro Takeda 732b69a54eeSKentaro Takeda if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE)) 733b69a54eeSKentaro Takeda return 0; 734b69a54eeSKentaro Takeda if (operation == 6) 735b69a54eeSKentaro Takeda perm = 1 << TOMOYO_TYPE_READ_WRITE_ACL; 736b69a54eeSKentaro Takeda else if (operation == 4) 737b69a54eeSKentaro Takeda perm = 1 << TOMOYO_TYPE_READ_ACL; 738b69a54eeSKentaro Takeda else if (operation == 2) 739b69a54eeSKentaro Takeda perm = 1 << TOMOYO_TYPE_WRITE_ACL; 740b69a54eeSKentaro Takeda else if (operation == 1) 741b69a54eeSKentaro Takeda perm = 1 << TOMOYO_TYPE_EXECUTE_ACL; 742b69a54eeSKentaro Takeda else 743b69a54eeSKentaro Takeda BUG(); 744b69a54eeSKentaro Takeda return tomoyo_check_single_path_acl2(domain, filename, perm, 745b69a54eeSKentaro Takeda operation != 1); 746b69a54eeSKentaro Takeda } 747b69a54eeSKentaro Takeda 748b69a54eeSKentaro Takeda /** 749b69a54eeSKentaro Takeda * tomoyo_check_file_perm2 - Check permission for opening files. 750b69a54eeSKentaro Takeda * 751b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 752b69a54eeSKentaro Takeda * @filename: Filename to check. 753b69a54eeSKentaro Takeda * @perm: Mode ("read" or "write" or "read/write" or "execute"). 754b69a54eeSKentaro Takeda * @operation: Operation name passed used for verbose mode. 755b69a54eeSKentaro Takeda * @mode: Access control mode. 756b69a54eeSKentaro Takeda * 757b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 758fdb8ebb7STetsuo Handa * 759fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 760b69a54eeSKentaro Takeda */ 761b69a54eeSKentaro Takeda static int tomoyo_check_file_perm2(struct tomoyo_domain_info * const domain, 762b69a54eeSKentaro Takeda const struct tomoyo_path_info *filename, 763b69a54eeSKentaro Takeda const u8 perm, const char *operation, 764b69a54eeSKentaro Takeda const u8 mode) 765b69a54eeSKentaro Takeda { 766b69a54eeSKentaro Takeda const bool is_enforce = (mode == 3); 767b69a54eeSKentaro Takeda const char *msg = "<unknown>"; 768b69a54eeSKentaro Takeda int error = 0; 769b69a54eeSKentaro Takeda 770b69a54eeSKentaro Takeda if (!filename) 771b69a54eeSKentaro Takeda return 0; 772b69a54eeSKentaro Takeda error = tomoyo_check_file_acl(domain, filename, perm); 773ea13ddbaSTetsuo Handa if (error && perm == 4 && !domain->ignore_global_allow_read 774b69a54eeSKentaro Takeda && tomoyo_is_globally_readable_file(filename)) 775b69a54eeSKentaro Takeda error = 0; 776b69a54eeSKentaro Takeda if (perm == 6) 777b69a54eeSKentaro Takeda msg = tomoyo_sp2keyword(TOMOYO_TYPE_READ_WRITE_ACL); 778b69a54eeSKentaro Takeda else if (perm == 4) 779b69a54eeSKentaro Takeda msg = tomoyo_sp2keyword(TOMOYO_TYPE_READ_ACL); 780b69a54eeSKentaro Takeda else if (perm == 2) 781b69a54eeSKentaro Takeda msg = tomoyo_sp2keyword(TOMOYO_TYPE_WRITE_ACL); 782b69a54eeSKentaro Takeda else if (perm == 1) 783b69a54eeSKentaro Takeda msg = tomoyo_sp2keyword(TOMOYO_TYPE_EXECUTE_ACL); 784b69a54eeSKentaro Takeda else 785b69a54eeSKentaro Takeda BUG(); 786b69a54eeSKentaro Takeda if (!error) 787b69a54eeSKentaro Takeda return 0; 788b69a54eeSKentaro Takeda if (tomoyo_verbose_mode(domain)) 789b69a54eeSKentaro Takeda printk(KERN_WARNING "TOMOYO-%s: Access '%s(%s) %s' denied " 790b69a54eeSKentaro Takeda "for %s\n", tomoyo_get_msg(is_enforce), msg, operation, 791b69a54eeSKentaro Takeda filename->name, tomoyo_get_last_name(domain)); 792b69a54eeSKentaro Takeda if (is_enforce) 793b69a54eeSKentaro Takeda return error; 794b69a54eeSKentaro Takeda if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) { 795b69a54eeSKentaro Takeda /* Don't use patterns for execute permission. */ 796b69a54eeSKentaro Takeda const struct tomoyo_path_info *patterned_file = (perm != 1) ? 797b69a54eeSKentaro Takeda tomoyo_get_file_pattern(filename) : filename; 798b69a54eeSKentaro Takeda tomoyo_update_file_acl(patterned_file->name, perm, 799b69a54eeSKentaro Takeda domain, false); 800b69a54eeSKentaro Takeda } 801b69a54eeSKentaro Takeda return 0; 802b69a54eeSKentaro Takeda } 803b69a54eeSKentaro Takeda 804b69a54eeSKentaro Takeda /** 805b69a54eeSKentaro Takeda * tomoyo_write_file_policy - Update file related list. 806b69a54eeSKentaro Takeda * 807b69a54eeSKentaro Takeda * @data: String to parse. 808b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 809b69a54eeSKentaro Takeda * @is_delete: True if it is a delete request. 810b69a54eeSKentaro Takeda * 811b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 812fdb8ebb7STetsuo Handa * 813fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 814b69a54eeSKentaro Takeda */ 815b69a54eeSKentaro Takeda int tomoyo_write_file_policy(char *data, struct tomoyo_domain_info *domain, 816b69a54eeSKentaro Takeda const bool is_delete) 817b69a54eeSKentaro Takeda { 818b69a54eeSKentaro Takeda char *filename = strchr(data, ' '); 819b69a54eeSKentaro Takeda char *filename2; 820b69a54eeSKentaro Takeda unsigned int perm; 821b69a54eeSKentaro Takeda u8 type; 822b69a54eeSKentaro Takeda 823b69a54eeSKentaro Takeda if (!filename) 824b69a54eeSKentaro Takeda return -EINVAL; 825b69a54eeSKentaro Takeda *filename++ = '\0'; 826b69a54eeSKentaro Takeda if (sscanf(data, "%u", &perm) == 1) 827b69a54eeSKentaro Takeda return tomoyo_update_file_acl(filename, (u8) perm, domain, 828b69a54eeSKentaro Takeda is_delete); 829b69a54eeSKentaro Takeda if (strncmp(data, "allow_", 6)) 830b69a54eeSKentaro Takeda goto out; 831b69a54eeSKentaro Takeda data += 6; 832b69a54eeSKentaro Takeda for (type = 0; type < TOMOYO_MAX_SINGLE_PATH_OPERATION; type++) { 833b69a54eeSKentaro Takeda if (strcmp(data, tomoyo_sp_keyword[type])) 834b69a54eeSKentaro Takeda continue; 835b69a54eeSKentaro Takeda return tomoyo_update_single_path_acl(type, filename, 836b69a54eeSKentaro Takeda domain, is_delete); 837b69a54eeSKentaro Takeda } 838b69a54eeSKentaro Takeda filename2 = strchr(filename, ' '); 839b69a54eeSKentaro Takeda if (!filename2) 840b69a54eeSKentaro Takeda goto out; 841b69a54eeSKentaro Takeda *filename2++ = '\0'; 842b69a54eeSKentaro Takeda for (type = 0; type < TOMOYO_MAX_DOUBLE_PATH_OPERATION; type++) { 843b69a54eeSKentaro Takeda if (strcmp(data, tomoyo_dp_keyword[type])) 844b69a54eeSKentaro Takeda continue; 845b69a54eeSKentaro Takeda return tomoyo_update_double_path_acl(type, filename, filename2, 846b69a54eeSKentaro Takeda domain, is_delete); 847b69a54eeSKentaro Takeda } 848b69a54eeSKentaro Takeda out: 849b69a54eeSKentaro Takeda return -EINVAL; 850b69a54eeSKentaro Takeda } 851b69a54eeSKentaro Takeda 852b69a54eeSKentaro Takeda /** 853b69a54eeSKentaro Takeda * tomoyo_update_single_path_acl - Update "struct tomoyo_single_path_acl_record" list. 854b69a54eeSKentaro Takeda * 855b69a54eeSKentaro Takeda * @type: Type of operation. 856b69a54eeSKentaro Takeda * @filename: Filename. 857b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 858b69a54eeSKentaro Takeda * @is_delete: True if it is a delete request. 859b69a54eeSKentaro Takeda * 860b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 861fdb8ebb7STetsuo Handa * 862fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 863b69a54eeSKentaro Takeda */ 864b69a54eeSKentaro Takeda static int tomoyo_update_single_path_acl(const u8 type, const char *filename, 865b69a54eeSKentaro Takeda struct tomoyo_domain_info * 866b69a54eeSKentaro Takeda const domain, const bool is_delete) 867b69a54eeSKentaro Takeda { 868937bf613STetsuo Handa static const u32 rw_mask = 869b69a54eeSKentaro Takeda (1 << TOMOYO_TYPE_READ_ACL) | (1 << TOMOYO_TYPE_WRITE_ACL); 870b69a54eeSKentaro Takeda const struct tomoyo_path_info *saved_filename; 871b69a54eeSKentaro Takeda struct tomoyo_acl_info *ptr; 872b69a54eeSKentaro Takeda struct tomoyo_single_path_acl_record *acl; 873b69a54eeSKentaro Takeda int error = -ENOMEM; 874937bf613STetsuo Handa const u32 perm = 1 << type; 875b69a54eeSKentaro Takeda 876b69a54eeSKentaro Takeda if (!domain) 877b69a54eeSKentaro Takeda return -EINVAL; 878b69a54eeSKentaro Takeda if (!tomoyo_is_correct_path(filename, 0, 0, 0, __func__)) 879b69a54eeSKentaro Takeda return -EINVAL; 880b69a54eeSKentaro Takeda saved_filename = tomoyo_save_name(filename); 881b69a54eeSKentaro Takeda if (!saved_filename) 882b69a54eeSKentaro Takeda return -ENOMEM; 883f737d95dSTetsuo Handa mutex_lock(&tomoyo_policy_lock); 884b69a54eeSKentaro Takeda if (is_delete) 885b69a54eeSKentaro Takeda goto delete; 886fdb8ebb7STetsuo Handa list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { 887ea13ddbaSTetsuo Handa if (ptr->type != TOMOYO_TYPE_SINGLE_PATH_ACL) 888b69a54eeSKentaro Takeda continue; 889b69a54eeSKentaro Takeda acl = container_of(ptr, struct tomoyo_single_path_acl_record, 890b69a54eeSKentaro Takeda head); 891b69a54eeSKentaro Takeda if (acl->filename != saved_filename) 892b69a54eeSKentaro Takeda continue; 893937bf613STetsuo Handa if (perm <= 0xFFFF) 894b69a54eeSKentaro Takeda acl->perm |= perm; 895937bf613STetsuo Handa else 896937bf613STetsuo Handa acl->perm_high |= (perm >> 16); 897b69a54eeSKentaro Takeda if ((acl->perm & rw_mask) == rw_mask) 898b69a54eeSKentaro Takeda acl->perm |= 1 << TOMOYO_TYPE_READ_WRITE_ACL; 899b69a54eeSKentaro Takeda else if (acl->perm & (1 << TOMOYO_TYPE_READ_WRITE_ACL)) 900b69a54eeSKentaro Takeda acl->perm |= rw_mask; 901b69a54eeSKentaro Takeda error = 0; 902b69a54eeSKentaro Takeda goto out; 903b69a54eeSKentaro Takeda } 904b69a54eeSKentaro Takeda /* Not found. Append it to the tail. */ 905cd7bec6aSTetsuo Handa acl = kmalloc(sizeof(*acl), GFP_KERNEL); 906cd7bec6aSTetsuo Handa if (!tomoyo_memory_ok(acl)) { 907cd7bec6aSTetsuo Handa kfree(acl); 908cd7bec6aSTetsuo Handa acl = NULL; 909b69a54eeSKentaro Takeda goto out; 910cd7bec6aSTetsuo Handa } 911cd7bec6aSTetsuo Handa acl->head.type = TOMOYO_TYPE_SINGLE_PATH_ACL; 912937bf613STetsuo Handa if (perm <= 0xFFFF) 913b69a54eeSKentaro Takeda acl->perm = perm; 914937bf613STetsuo Handa else 915937bf613STetsuo Handa acl->perm_high = (perm >> 16); 916b69a54eeSKentaro Takeda if (perm == (1 << TOMOYO_TYPE_READ_WRITE_ACL)) 917b69a54eeSKentaro Takeda acl->perm |= rw_mask; 918b69a54eeSKentaro Takeda acl->filename = saved_filename; 919fdb8ebb7STetsuo Handa list_add_tail_rcu(&acl->head.list, &domain->acl_info_list); 920b69a54eeSKentaro Takeda error = 0; 921b69a54eeSKentaro Takeda goto out; 922b69a54eeSKentaro Takeda delete: 923b69a54eeSKentaro Takeda error = -ENOENT; 924fdb8ebb7STetsuo Handa list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { 925ea13ddbaSTetsuo Handa if (ptr->type != TOMOYO_TYPE_SINGLE_PATH_ACL) 926b69a54eeSKentaro Takeda continue; 927b69a54eeSKentaro Takeda acl = container_of(ptr, struct tomoyo_single_path_acl_record, 928b69a54eeSKentaro Takeda head); 929b69a54eeSKentaro Takeda if (acl->filename != saved_filename) 930b69a54eeSKentaro Takeda continue; 931937bf613STetsuo Handa if (perm <= 0xFFFF) 932b69a54eeSKentaro Takeda acl->perm &= ~perm; 933937bf613STetsuo Handa else 934937bf613STetsuo Handa acl->perm_high &= ~(perm >> 16); 935b69a54eeSKentaro Takeda if ((acl->perm & rw_mask) != rw_mask) 936b69a54eeSKentaro Takeda acl->perm &= ~(1 << TOMOYO_TYPE_READ_WRITE_ACL); 937b69a54eeSKentaro Takeda else if (!(acl->perm & (1 << TOMOYO_TYPE_READ_WRITE_ACL))) 938b69a54eeSKentaro Takeda acl->perm &= ~rw_mask; 939b69a54eeSKentaro Takeda error = 0; 940b69a54eeSKentaro Takeda break; 941b69a54eeSKentaro Takeda } 942b69a54eeSKentaro Takeda out: 943f737d95dSTetsuo Handa mutex_unlock(&tomoyo_policy_lock); 944b69a54eeSKentaro Takeda return error; 945b69a54eeSKentaro Takeda } 946b69a54eeSKentaro Takeda 947b69a54eeSKentaro Takeda /** 948b69a54eeSKentaro Takeda * tomoyo_update_double_path_acl - Update "struct tomoyo_double_path_acl_record" list. 949b69a54eeSKentaro Takeda * 950b69a54eeSKentaro Takeda * @type: Type of operation. 951b69a54eeSKentaro Takeda * @filename1: First filename. 952b69a54eeSKentaro Takeda * @filename2: Second filename. 953b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 954b69a54eeSKentaro Takeda * @is_delete: True if it is a delete request. 955b69a54eeSKentaro Takeda * 956b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 957fdb8ebb7STetsuo Handa * 958fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 959b69a54eeSKentaro Takeda */ 960b69a54eeSKentaro Takeda static int tomoyo_update_double_path_acl(const u8 type, const char *filename1, 961b69a54eeSKentaro Takeda const char *filename2, 962b69a54eeSKentaro Takeda struct tomoyo_domain_info * 963b69a54eeSKentaro Takeda const domain, const bool is_delete) 964b69a54eeSKentaro Takeda { 965b69a54eeSKentaro Takeda const struct tomoyo_path_info *saved_filename1; 966b69a54eeSKentaro Takeda const struct tomoyo_path_info *saved_filename2; 967b69a54eeSKentaro Takeda struct tomoyo_acl_info *ptr; 968b69a54eeSKentaro Takeda struct tomoyo_double_path_acl_record *acl; 969b69a54eeSKentaro Takeda int error = -ENOMEM; 970b69a54eeSKentaro Takeda const u8 perm = 1 << type; 971b69a54eeSKentaro Takeda 972b69a54eeSKentaro Takeda if (!domain) 973b69a54eeSKentaro Takeda return -EINVAL; 974b69a54eeSKentaro Takeda if (!tomoyo_is_correct_path(filename1, 0, 0, 0, __func__) || 975b69a54eeSKentaro Takeda !tomoyo_is_correct_path(filename2, 0, 0, 0, __func__)) 976b69a54eeSKentaro Takeda return -EINVAL; 977b69a54eeSKentaro Takeda saved_filename1 = tomoyo_save_name(filename1); 978b69a54eeSKentaro Takeda saved_filename2 = tomoyo_save_name(filename2); 979b69a54eeSKentaro Takeda if (!saved_filename1 || !saved_filename2) 980b69a54eeSKentaro Takeda return -ENOMEM; 981f737d95dSTetsuo Handa mutex_lock(&tomoyo_policy_lock); 982b69a54eeSKentaro Takeda if (is_delete) 983b69a54eeSKentaro Takeda goto delete; 984fdb8ebb7STetsuo Handa list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { 985ea13ddbaSTetsuo Handa if (ptr->type != TOMOYO_TYPE_DOUBLE_PATH_ACL) 986b69a54eeSKentaro Takeda continue; 987b69a54eeSKentaro Takeda acl = container_of(ptr, struct tomoyo_double_path_acl_record, 988b69a54eeSKentaro Takeda head); 989b69a54eeSKentaro Takeda if (acl->filename1 != saved_filename1 || 990b69a54eeSKentaro Takeda acl->filename2 != saved_filename2) 991b69a54eeSKentaro Takeda continue; 992b69a54eeSKentaro Takeda acl->perm |= perm; 993b69a54eeSKentaro Takeda error = 0; 994b69a54eeSKentaro Takeda goto out; 995b69a54eeSKentaro Takeda } 996b69a54eeSKentaro Takeda /* Not found. Append it to the tail. */ 997cd7bec6aSTetsuo Handa acl = kmalloc(sizeof(*acl), GFP_KERNEL); 998cd7bec6aSTetsuo Handa if (!tomoyo_memory_ok(acl)) { 999cd7bec6aSTetsuo Handa kfree(acl); 1000cd7bec6aSTetsuo Handa acl = NULL; 1001b69a54eeSKentaro Takeda goto out; 1002cd7bec6aSTetsuo Handa } 1003cd7bec6aSTetsuo Handa acl->head.type = TOMOYO_TYPE_DOUBLE_PATH_ACL; 1004b69a54eeSKentaro Takeda acl->perm = perm; 1005b69a54eeSKentaro Takeda acl->filename1 = saved_filename1; 1006b69a54eeSKentaro Takeda acl->filename2 = saved_filename2; 1007fdb8ebb7STetsuo Handa list_add_tail_rcu(&acl->head.list, &domain->acl_info_list); 1008b69a54eeSKentaro Takeda error = 0; 1009b69a54eeSKentaro Takeda goto out; 1010b69a54eeSKentaro Takeda delete: 1011b69a54eeSKentaro Takeda error = -ENOENT; 1012fdb8ebb7STetsuo Handa list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { 1013ea13ddbaSTetsuo Handa if (ptr->type != TOMOYO_TYPE_DOUBLE_PATH_ACL) 1014b69a54eeSKentaro Takeda continue; 1015b69a54eeSKentaro Takeda acl = container_of(ptr, struct tomoyo_double_path_acl_record, 1016b69a54eeSKentaro Takeda head); 1017b69a54eeSKentaro Takeda if (acl->filename1 != saved_filename1 || 1018b69a54eeSKentaro Takeda acl->filename2 != saved_filename2) 1019b69a54eeSKentaro Takeda continue; 1020b69a54eeSKentaro Takeda acl->perm &= ~perm; 1021b69a54eeSKentaro Takeda error = 0; 1022b69a54eeSKentaro Takeda break; 1023b69a54eeSKentaro Takeda } 1024b69a54eeSKentaro Takeda out: 1025f737d95dSTetsuo Handa mutex_unlock(&tomoyo_policy_lock); 1026b69a54eeSKentaro Takeda return error; 1027b69a54eeSKentaro Takeda } 1028b69a54eeSKentaro Takeda 1029b69a54eeSKentaro Takeda /** 1030b69a54eeSKentaro Takeda * tomoyo_check_single_path_acl - Check permission for single path operation. 1031b69a54eeSKentaro Takeda * 1032b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 1033b69a54eeSKentaro Takeda * @type: Type of operation. 1034b69a54eeSKentaro Takeda * @filename: Filename to check. 1035b69a54eeSKentaro Takeda * 1036b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 1037fdb8ebb7STetsuo Handa * 1038fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 1039b69a54eeSKentaro Takeda */ 1040b69a54eeSKentaro Takeda static int tomoyo_check_single_path_acl(struct tomoyo_domain_info *domain, 1041b69a54eeSKentaro Takeda const u8 type, 1042b69a54eeSKentaro Takeda const struct tomoyo_path_info *filename) 1043b69a54eeSKentaro Takeda { 1044b69a54eeSKentaro Takeda if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE)) 1045b69a54eeSKentaro Takeda return 0; 1046b69a54eeSKentaro Takeda return tomoyo_check_single_path_acl2(domain, filename, 1 << type, 1); 1047b69a54eeSKentaro Takeda } 1048b69a54eeSKentaro Takeda 1049b69a54eeSKentaro Takeda /** 1050b69a54eeSKentaro Takeda * tomoyo_check_double_path_acl - Check permission for double path operation. 1051b69a54eeSKentaro Takeda * 1052b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 1053b69a54eeSKentaro Takeda * @type: Type of operation. 1054b69a54eeSKentaro Takeda * @filename1: First filename to check. 1055b69a54eeSKentaro Takeda * @filename2: Second filename to check. 1056b69a54eeSKentaro Takeda * 1057b69a54eeSKentaro Takeda * Returns 0 on success, -EPERM otherwise. 1058fdb8ebb7STetsuo Handa * 1059fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 1060b69a54eeSKentaro Takeda */ 1061b69a54eeSKentaro Takeda static int tomoyo_check_double_path_acl(const struct tomoyo_domain_info *domain, 1062b69a54eeSKentaro Takeda const u8 type, 1063b69a54eeSKentaro Takeda const struct tomoyo_path_info * 1064b69a54eeSKentaro Takeda filename1, 1065b69a54eeSKentaro Takeda const struct tomoyo_path_info * 1066b69a54eeSKentaro Takeda filename2) 1067b69a54eeSKentaro Takeda { 1068b69a54eeSKentaro Takeda struct tomoyo_acl_info *ptr; 1069b69a54eeSKentaro Takeda const u8 perm = 1 << type; 1070b69a54eeSKentaro Takeda int error = -EPERM; 1071b69a54eeSKentaro Takeda 1072b69a54eeSKentaro Takeda if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE)) 1073b69a54eeSKentaro Takeda return 0; 1074fdb8ebb7STetsuo Handa list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { 1075b69a54eeSKentaro Takeda struct tomoyo_double_path_acl_record *acl; 1076ea13ddbaSTetsuo Handa if (ptr->type != TOMOYO_TYPE_DOUBLE_PATH_ACL) 1077b69a54eeSKentaro Takeda continue; 1078b69a54eeSKentaro Takeda acl = container_of(ptr, struct tomoyo_double_path_acl_record, 1079b69a54eeSKentaro Takeda head); 1080b69a54eeSKentaro Takeda if (!(acl->perm & perm)) 1081b69a54eeSKentaro Takeda continue; 1082b69a54eeSKentaro Takeda if (!tomoyo_path_matches_pattern(filename1, acl->filename1)) 1083b69a54eeSKentaro Takeda continue; 1084b69a54eeSKentaro Takeda if (!tomoyo_path_matches_pattern(filename2, acl->filename2)) 1085b69a54eeSKentaro Takeda continue; 1086b69a54eeSKentaro Takeda error = 0; 1087b69a54eeSKentaro Takeda break; 1088b69a54eeSKentaro Takeda } 1089b69a54eeSKentaro Takeda return error; 1090b69a54eeSKentaro Takeda } 1091b69a54eeSKentaro Takeda 1092b69a54eeSKentaro Takeda /** 1093b69a54eeSKentaro Takeda * tomoyo_check_single_path_permission2 - Check permission for single path operation. 1094b69a54eeSKentaro Takeda * 1095b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 1096b69a54eeSKentaro Takeda * @operation: Type of operation. 1097b69a54eeSKentaro Takeda * @filename: Filename to check. 1098b69a54eeSKentaro Takeda * @mode: Access control mode. 1099b69a54eeSKentaro Takeda * 1100b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 1101fdb8ebb7STetsuo Handa * 1102fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 1103b69a54eeSKentaro Takeda */ 1104b69a54eeSKentaro Takeda static int tomoyo_check_single_path_permission2(struct tomoyo_domain_info * 1105b69a54eeSKentaro Takeda const domain, u8 operation, 1106b69a54eeSKentaro Takeda const struct tomoyo_path_info * 1107b69a54eeSKentaro Takeda filename, const u8 mode) 1108b69a54eeSKentaro Takeda { 1109b69a54eeSKentaro Takeda const char *msg; 1110b69a54eeSKentaro Takeda int error; 1111b69a54eeSKentaro Takeda const bool is_enforce = (mode == 3); 1112b69a54eeSKentaro Takeda 1113b69a54eeSKentaro Takeda if (!mode) 1114b69a54eeSKentaro Takeda return 0; 1115b69a54eeSKentaro Takeda next: 1116b69a54eeSKentaro Takeda error = tomoyo_check_single_path_acl(domain, operation, filename); 1117b69a54eeSKentaro Takeda msg = tomoyo_sp2keyword(operation); 1118b69a54eeSKentaro Takeda if (!error) 1119b69a54eeSKentaro Takeda goto ok; 1120b69a54eeSKentaro Takeda if (tomoyo_verbose_mode(domain)) 1121b69a54eeSKentaro Takeda printk(KERN_WARNING "TOMOYO-%s: Access '%s %s' denied for %s\n", 1122b69a54eeSKentaro Takeda tomoyo_get_msg(is_enforce), msg, filename->name, 1123b69a54eeSKentaro Takeda tomoyo_get_last_name(domain)); 1124b69a54eeSKentaro Takeda if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) { 1125b69a54eeSKentaro Takeda const char *name = tomoyo_get_file_pattern(filename)->name; 1126b69a54eeSKentaro Takeda tomoyo_update_single_path_acl(operation, name, domain, false); 1127b69a54eeSKentaro Takeda } 1128b69a54eeSKentaro Takeda if (!is_enforce) 1129b69a54eeSKentaro Takeda error = 0; 1130b69a54eeSKentaro Takeda ok: 1131b69a54eeSKentaro Takeda /* 1132b69a54eeSKentaro Takeda * Since "allow_truncate" doesn't imply "allow_rewrite" permission, 1133b69a54eeSKentaro Takeda * we need to check "allow_rewrite" permission if the filename is 1134b69a54eeSKentaro Takeda * specified by "deny_rewrite" keyword. 1135b69a54eeSKentaro Takeda */ 1136b69a54eeSKentaro Takeda if (!error && operation == TOMOYO_TYPE_TRUNCATE_ACL && 1137b69a54eeSKentaro Takeda tomoyo_is_no_rewrite_file(filename)) { 1138b69a54eeSKentaro Takeda operation = TOMOYO_TYPE_REWRITE_ACL; 1139b69a54eeSKentaro Takeda goto next; 1140b69a54eeSKentaro Takeda } 1141b69a54eeSKentaro Takeda return error; 1142b69a54eeSKentaro Takeda } 1143b69a54eeSKentaro Takeda 1144b69a54eeSKentaro Takeda /** 1145b69a54eeSKentaro Takeda * tomoyo_check_exec_perm - Check permission for "execute". 1146b69a54eeSKentaro Takeda * 1147b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 1148b69a54eeSKentaro Takeda * @filename: Check permission for "execute". 1149b69a54eeSKentaro Takeda * 1150b69a54eeSKentaro Takeda * Returns 0 on success, negativevalue otherwise. 1151fdb8ebb7STetsuo Handa * 1152fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 1153b69a54eeSKentaro Takeda */ 1154b69a54eeSKentaro Takeda int tomoyo_check_exec_perm(struct tomoyo_domain_info *domain, 1155bcb86975STetsuo Handa const struct tomoyo_path_info *filename) 1156b69a54eeSKentaro Takeda { 1157b69a54eeSKentaro Takeda const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); 1158b69a54eeSKentaro Takeda 1159b69a54eeSKentaro Takeda if (!mode) 1160b69a54eeSKentaro Takeda return 0; 1161b69a54eeSKentaro Takeda return tomoyo_check_file_perm2(domain, filename, 1, "do_execve", mode); 1162b69a54eeSKentaro Takeda } 1163b69a54eeSKentaro Takeda 1164b69a54eeSKentaro Takeda /** 1165b69a54eeSKentaro Takeda * tomoyo_check_open_permission - Check permission for "read" and "write". 1166b69a54eeSKentaro Takeda * 1167b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 1168b69a54eeSKentaro Takeda * @path: Pointer to "struct path". 1169b69a54eeSKentaro Takeda * @flag: Flags for open(). 1170b69a54eeSKentaro Takeda * 1171b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 1172b69a54eeSKentaro Takeda */ 1173b69a54eeSKentaro Takeda int tomoyo_check_open_permission(struct tomoyo_domain_info *domain, 1174b69a54eeSKentaro Takeda struct path *path, const int flag) 1175b69a54eeSKentaro Takeda { 1176b69a54eeSKentaro Takeda const u8 acc_mode = ACC_MODE(flag); 1177b69a54eeSKentaro Takeda int error = -ENOMEM; 1178b69a54eeSKentaro Takeda struct tomoyo_path_info *buf; 1179b69a54eeSKentaro Takeda const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); 1180b69a54eeSKentaro Takeda const bool is_enforce = (mode == 3); 1181fdb8ebb7STetsuo Handa int idx; 1182b69a54eeSKentaro Takeda 1183b69a54eeSKentaro Takeda if (!mode || !path->mnt) 1184b69a54eeSKentaro Takeda return 0; 1185b69a54eeSKentaro Takeda if (acc_mode == 0) 1186b69a54eeSKentaro Takeda return 0; 1187b69a54eeSKentaro Takeda if (path->dentry->d_inode && S_ISDIR(path->dentry->d_inode->i_mode)) 1188b69a54eeSKentaro Takeda /* 1189b69a54eeSKentaro Takeda * I don't check directories here because mkdir() and rmdir() 1190b69a54eeSKentaro Takeda * don't call me. 1191b69a54eeSKentaro Takeda */ 1192b69a54eeSKentaro Takeda return 0; 1193fdb8ebb7STetsuo Handa idx = tomoyo_read_lock(); 1194b69a54eeSKentaro Takeda buf = tomoyo_get_path(path); 1195b69a54eeSKentaro Takeda if (!buf) 1196b69a54eeSKentaro Takeda goto out; 1197b69a54eeSKentaro Takeda error = 0; 1198b69a54eeSKentaro Takeda /* 1199b69a54eeSKentaro Takeda * If the filename is specified by "deny_rewrite" keyword, 1200b69a54eeSKentaro Takeda * we need to check "allow_rewrite" permission when the filename is not 1201b69a54eeSKentaro Takeda * opened for append mode or the filename is truncated at open time. 1202b69a54eeSKentaro Takeda */ 1203b69a54eeSKentaro Takeda if ((acc_mode & MAY_WRITE) && 1204b69a54eeSKentaro Takeda ((flag & O_TRUNC) || !(flag & O_APPEND)) && 1205b69a54eeSKentaro Takeda (tomoyo_is_no_rewrite_file(buf))) { 1206b69a54eeSKentaro Takeda error = tomoyo_check_single_path_permission2(domain, 1207b69a54eeSKentaro Takeda TOMOYO_TYPE_REWRITE_ACL, 1208b69a54eeSKentaro Takeda buf, mode); 1209b69a54eeSKentaro Takeda } 1210b69a54eeSKentaro Takeda if (!error) 1211b69a54eeSKentaro Takeda error = tomoyo_check_file_perm2(domain, buf, acc_mode, "open", 1212b69a54eeSKentaro Takeda mode); 1213b69a54eeSKentaro Takeda if (!error && (flag & O_TRUNC)) 1214b69a54eeSKentaro Takeda error = tomoyo_check_single_path_permission2(domain, 1215b69a54eeSKentaro Takeda TOMOYO_TYPE_TRUNCATE_ACL, 1216b69a54eeSKentaro Takeda buf, mode); 1217b69a54eeSKentaro Takeda out: 12188e2d39a1STetsuo Handa kfree(buf); 1219fdb8ebb7STetsuo Handa tomoyo_read_unlock(idx); 1220b69a54eeSKentaro Takeda if (!is_enforce) 1221b69a54eeSKentaro Takeda error = 0; 1222b69a54eeSKentaro Takeda return error; 1223b69a54eeSKentaro Takeda } 1224b69a54eeSKentaro Takeda 1225b69a54eeSKentaro Takeda /** 1226937bf613STetsuo 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". 1227b69a54eeSKentaro Takeda * 1228b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 1229b69a54eeSKentaro Takeda * @operation: Type of operation. 1230b69a54eeSKentaro Takeda * @path: Pointer to "struct path". 1231b69a54eeSKentaro Takeda * 1232b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 1233b69a54eeSKentaro Takeda */ 1234b69a54eeSKentaro Takeda int tomoyo_check_1path_perm(struct tomoyo_domain_info *domain, 1235b69a54eeSKentaro Takeda const u8 operation, struct path *path) 1236b69a54eeSKentaro Takeda { 1237b69a54eeSKentaro Takeda int error = -ENOMEM; 1238b69a54eeSKentaro Takeda struct tomoyo_path_info *buf; 1239b69a54eeSKentaro Takeda const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); 1240b69a54eeSKentaro Takeda const bool is_enforce = (mode == 3); 1241fdb8ebb7STetsuo Handa int idx; 1242b69a54eeSKentaro Takeda 1243b69a54eeSKentaro Takeda if (!mode || !path->mnt) 1244b69a54eeSKentaro Takeda return 0; 1245fdb8ebb7STetsuo Handa idx = tomoyo_read_lock(); 1246b69a54eeSKentaro Takeda buf = tomoyo_get_path(path); 1247b69a54eeSKentaro Takeda if (!buf) 1248b69a54eeSKentaro Takeda goto out; 1249b69a54eeSKentaro Takeda switch (operation) { 1250b69a54eeSKentaro Takeda case TOMOYO_TYPE_MKDIR_ACL: 1251b69a54eeSKentaro Takeda case TOMOYO_TYPE_RMDIR_ACL: 1252937bf613STetsuo Handa case TOMOYO_TYPE_CHROOT_ACL: 1253b69a54eeSKentaro Takeda if (!buf->is_dir) { 1254b69a54eeSKentaro Takeda /* 1255b69a54eeSKentaro Takeda * tomoyo_get_path() reserves space for appending "/." 1256b69a54eeSKentaro Takeda */ 1257b69a54eeSKentaro Takeda strcat((char *) buf->name, "/"); 1258b69a54eeSKentaro Takeda tomoyo_fill_path_info(buf); 1259b69a54eeSKentaro Takeda } 1260b69a54eeSKentaro Takeda } 1261b69a54eeSKentaro Takeda error = tomoyo_check_single_path_permission2(domain, operation, buf, 1262b69a54eeSKentaro Takeda mode); 1263b69a54eeSKentaro Takeda out: 12648e2d39a1STetsuo Handa kfree(buf); 1265fdb8ebb7STetsuo Handa tomoyo_read_unlock(idx); 1266b69a54eeSKentaro Takeda if (!is_enforce) 1267b69a54eeSKentaro Takeda error = 0; 1268b69a54eeSKentaro Takeda return error; 1269b69a54eeSKentaro Takeda } 1270b69a54eeSKentaro Takeda 1271b69a54eeSKentaro Takeda /** 1272b69a54eeSKentaro Takeda * tomoyo_check_rewrite_permission - Check permission for "rewrite". 1273b69a54eeSKentaro Takeda * 1274b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 1275b69a54eeSKentaro Takeda * @filp: Pointer to "struct file". 1276b69a54eeSKentaro Takeda * 1277b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 1278b69a54eeSKentaro Takeda */ 1279b69a54eeSKentaro Takeda int tomoyo_check_rewrite_permission(struct tomoyo_domain_info *domain, 1280b69a54eeSKentaro Takeda struct file *filp) 1281b69a54eeSKentaro Takeda { 1282b69a54eeSKentaro Takeda int error = -ENOMEM; 1283b69a54eeSKentaro Takeda const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); 1284b69a54eeSKentaro Takeda const bool is_enforce = (mode == 3); 1285b69a54eeSKentaro Takeda struct tomoyo_path_info *buf; 1286fdb8ebb7STetsuo Handa int idx; 1287b69a54eeSKentaro Takeda 1288b69a54eeSKentaro Takeda if (!mode || !filp->f_path.mnt) 1289b69a54eeSKentaro Takeda return 0; 1290fdb8ebb7STetsuo Handa 1291fdb8ebb7STetsuo Handa idx = tomoyo_read_lock(); 1292b69a54eeSKentaro Takeda buf = tomoyo_get_path(&filp->f_path); 1293b69a54eeSKentaro Takeda if (!buf) 1294b69a54eeSKentaro Takeda goto out; 1295b69a54eeSKentaro Takeda if (!tomoyo_is_no_rewrite_file(buf)) { 1296b69a54eeSKentaro Takeda error = 0; 1297b69a54eeSKentaro Takeda goto out; 1298b69a54eeSKentaro Takeda } 1299b69a54eeSKentaro Takeda error = tomoyo_check_single_path_permission2(domain, 1300b69a54eeSKentaro Takeda TOMOYO_TYPE_REWRITE_ACL, 1301b69a54eeSKentaro Takeda buf, mode); 1302b69a54eeSKentaro Takeda out: 13038e2d39a1STetsuo Handa kfree(buf); 1304fdb8ebb7STetsuo Handa tomoyo_read_unlock(idx); 1305b69a54eeSKentaro Takeda if (!is_enforce) 1306b69a54eeSKentaro Takeda error = 0; 1307b69a54eeSKentaro Takeda return error; 1308b69a54eeSKentaro Takeda } 1309b69a54eeSKentaro Takeda 1310b69a54eeSKentaro Takeda /** 1311937bf613STetsuo Handa * tomoyo_check_2path_perm - Check permission for "rename", "link" and "pivot_root". 1312b69a54eeSKentaro Takeda * 1313b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 1314b69a54eeSKentaro Takeda * @operation: Type of operation. 1315b69a54eeSKentaro Takeda * @path1: Pointer to "struct path". 1316b69a54eeSKentaro Takeda * @path2: Pointer to "struct path". 1317b69a54eeSKentaro Takeda * 1318b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 1319b69a54eeSKentaro Takeda */ 1320b69a54eeSKentaro Takeda int tomoyo_check_2path_perm(struct tomoyo_domain_info * const domain, 1321b69a54eeSKentaro Takeda const u8 operation, struct path *path1, 1322b69a54eeSKentaro Takeda struct path *path2) 1323b69a54eeSKentaro Takeda { 1324b69a54eeSKentaro Takeda int error = -ENOMEM; 1325b69a54eeSKentaro Takeda struct tomoyo_path_info *buf1, *buf2; 1326b69a54eeSKentaro Takeda const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); 1327b69a54eeSKentaro Takeda const bool is_enforce = (mode == 3); 1328b69a54eeSKentaro Takeda const char *msg; 1329fdb8ebb7STetsuo Handa int idx; 1330b69a54eeSKentaro Takeda 1331b69a54eeSKentaro Takeda if (!mode || !path1->mnt || !path2->mnt) 1332b69a54eeSKentaro Takeda return 0; 1333fdb8ebb7STetsuo Handa idx = tomoyo_read_lock(); 1334b69a54eeSKentaro Takeda buf1 = tomoyo_get_path(path1); 1335b69a54eeSKentaro Takeda buf2 = tomoyo_get_path(path2); 1336b69a54eeSKentaro Takeda if (!buf1 || !buf2) 1337b69a54eeSKentaro Takeda goto out; 1338b69a54eeSKentaro Takeda { 1339b69a54eeSKentaro Takeda struct dentry *dentry = path1->dentry; 1340b69a54eeSKentaro Takeda if (dentry->d_inode && S_ISDIR(dentry->d_inode->i_mode)) { 1341b69a54eeSKentaro Takeda /* 1342b69a54eeSKentaro Takeda * tomoyo_get_path() reserves space for appending "/." 1343b69a54eeSKentaro Takeda */ 1344b69a54eeSKentaro Takeda if (!buf1->is_dir) { 1345b69a54eeSKentaro Takeda strcat((char *) buf1->name, "/"); 1346b69a54eeSKentaro Takeda tomoyo_fill_path_info(buf1); 1347b69a54eeSKentaro Takeda } 1348b69a54eeSKentaro Takeda if (!buf2->is_dir) { 1349b69a54eeSKentaro Takeda strcat((char *) buf2->name, "/"); 1350b69a54eeSKentaro Takeda tomoyo_fill_path_info(buf2); 1351b69a54eeSKentaro Takeda } 1352b69a54eeSKentaro Takeda } 1353b69a54eeSKentaro Takeda } 1354b69a54eeSKentaro Takeda error = tomoyo_check_double_path_acl(domain, operation, buf1, buf2); 1355b69a54eeSKentaro Takeda msg = tomoyo_dp2keyword(operation); 1356b69a54eeSKentaro Takeda if (!error) 1357b69a54eeSKentaro Takeda goto out; 1358b69a54eeSKentaro Takeda if (tomoyo_verbose_mode(domain)) 1359b69a54eeSKentaro Takeda printk(KERN_WARNING "TOMOYO-%s: Access '%s %s %s' " 1360b69a54eeSKentaro Takeda "denied for %s\n", tomoyo_get_msg(is_enforce), 1361b69a54eeSKentaro Takeda msg, buf1->name, buf2->name, 1362b69a54eeSKentaro Takeda tomoyo_get_last_name(domain)); 1363b69a54eeSKentaro Takeda if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) { 1364b69a54eeSKentaro Takeda const char *name1 = tomoyo_get_file_pattern(buf1)->name; 1365b69a54eeSKentaro Takeda const char *name2 = tomoyo_get_file_pattern(buf2)->name; 1366b69a54eeSKentaro Takeda tomoyo_update_double_path_acl(operation, name1, name2, domain, 1367b69a54eeSKentaro Takeda false); 1368b69a54eeSKentaro Takeda } 1369b69a54eeSKentaro Takeda out: 13708e2d39a1STetsuo Handa kfree(buf1); 13718e2d39a1STetsuo Handa kfree(buf2); 1372fdb8ebb7STetsuo Handa tomoyo_read_unlock(idx); 1373b69a54eeSKentaro Takeda if (!is_enforce) 1374b69a54eeSKentaro Takeda error = 0; 1375b69a54eeSKentaro Takeda return error; 1376b69a54eeSKentaro Takeda } 1377