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 #define ACC_MODE(x) ("\000\004\002\006"[(x)&O_ACCMODE]) 16b69a54eeSKentaro Takeda 17c3fa109aSTetsuo Handa /* 18c3fa109aSTetsuo Handa * tomoyo_globally_readable_file_entry is a structure which is used for holding 19c3fa109aSTetsuo Handa * "allow_read" entries. 20c3fa109aSTetsuo Handa * It has following fields. 21c3fa109aSTetsuo Handa * 22c3fa109aSTetsuo Handa * (1) "list" which is linked to tomoyo_globally_readable_list . 23c3fa109aSTetsuo Handa * (2) "filename" is a pathname which is allowed to open(O_RDONLY). 24c3fa109aSTetsuo Handa * (3) "is_deleted" is a bool which is true if marked as deleted, false 25c3fa109aSTetsuo Handa * otherwise. 26c3fa109aSTetsuo Handa */ 27b69a54eeSKentaro Takeda struct tomoyo_globally_readable_file_entry { 28b69a54eeSKentaro Takeda struct list_head list; 29b69a54eeSKentaro Takeda const struct tomoyo_path_info *filename; 30b69a54eeSKentaro Takeda bool is_deleted; 31b69a54eeSKentaro Takeda }; 32b69a54eeSKentaro Takeda 33c3fa109aSTetsuo Handa /* 34c3fa109aSTetsuo Handa * tomoyo_pattern_entry is a structure which is used for holding 35c3fa109aSTetsuo Handa * "tomoyo_pattern_list" entries. 36c3fa109aSTetsuo Handa * It has following fields. 37c3fa109aSTetsuo Handa * 38c3fa109aSTetsuo Handa * (1) "list" which is linked to tomoyo_pattern_list . 39c3fa109aSTetsuo Handa * (2) "pattern" is a pathname pattern which is used for converting pathnames 40c3fa109aSTetsuo Handa * to pathname patterns during learning mode. 41c3fa109aSTetsuo Handa * (3) "is_deleted" is a bool which is true if marked as deleted, false 42c3fa109aSTetsuo Handa * otherwise. 43c3fa109aSTetsuo Handa */ 44b69a54eeSKentaro Takeda struct tomoyo_pattern_entry { 45b69a54eeSKentaro Takeda struct list_head list; 46b69a54eeSKentaro Takeda const struct tomoyo_path_info *pattern; 47b69a54eeSKentaro Takeda bool is_deleted; 48b69a54eeSKentaro Takeda }; 49b69a54eeSKentaro Takeda 50c3fa109aSTetsuo Handa /* 51c3fa109aSTetsuo Handa * tomoyo_no_rewrite_entry is a structure which is used for holding 52c3fa109aSTetsuo Handa * "deny_rewrite" entries. 53c3fa109aSTetsuo Handa * It has following fields. 54c3fa109aSTetsuo Handa * 55c3fa109aSTetsuo Handa * (1) "list" which is linked to tomoyo_no_rewrite_list . 56c3fa109aSTetsuo Handa * (2) "pattern" is a pathname which is by default not permitted to modify 57c3fa109aSTetsuo Handa * already existing content. 58c3fa109aSTetsuo Handa * (3) "is_deleted" is a bool which is true if marked as deleted, false 59c3fa109aSTetsuo Handa * otherwise. 60c3fa109aSTetsuo Handa */ 61b69a54eeSKentaro Takeda struct tomoyo_no_rewrite_entry { 62b69a54eeSKentaro Takeda struct list_head list; 63b69a54eeSKentaro Takeda const struct tomoyo_path_info *pattern; 64b69a54eeSKentaro Takeda bool is_deleted; 65b69a54eeSKentaro Takeda }; 66b69a54eeSKentaro Takeda 67b69a54eeSKentaro Takeda /* Keyword array for single path operations. */ 68b69a54eeSKentaro Takeda static const char *tomoyo_sp_keyword[TOMOYO_MAX_SINGLE_PATH_OPERATION] = { 69b69a54eeSKentaro Takeda [TOMOYO_TYPE_READ_WRITE_ACL] = "read/write", 70b69a54eeSKentaro Takeda [TOMOYO_TYPE_EXECUTE_ACL] = "execute", 71b69a54eeSKentaro Takeda [TOMOYO_TYPE_READ_ACL] = "read", 72b69a54eeSKentaro Takeda [TOMOYO_TYPE_WRITE_ACL] = "write", 73b69a54eeSKentaro Takeda [TOMOYO_TYPE_CREATE_ACL] = "create", 74b69a54eeSKentaro Takeda [TOMOYO_TYPE_UNLINK_ACL] = "unlink", 75b69a54eeSKentaro Takeda [TOMOYO_TYPE_MKDIR_ACL] = "mkdir", 76b69a54eeSKentaro Takeda [TOMOYO_TYPE_RMDIR_ACL] = "rmdir", 77b69a54eeSKentaro Takeda [TOMOYO_TYPE_MKFIFO_ACL] = "mkfifo", 78b69a54eeSKentaro Takeda [TOMOYO_TYPE_MKSOCK_ACL] = "mksock", 79b69a54eeSKentaro Takeda [TOMOYO_TYPE_MKBLOCK_ACL] = "mkblock", 80b69a54eeSKentaro Takeda [TOMOYO_TYPE_MKCHAR_ACL] = "mkchar", 81b69a54eeSKentaro Takeda [TOMOYO_TYPE_TRUNCATE_ACL] = "truncate", 82b69a54eeSKentaro Takeda [TOMOYO_TYPE_SYMLINK_ACL] = "symlink", 83b69a54eeSKentaro Takeda [TOMOYO_TYPE_REWRITE_ACL] = "rewrite", 84b69a54eeSKentaro Takeda }; 85b69a54eeSKentaro Takeda 86b69a54eeSKentaro Takeda /* Keyword array for double path operations. */ 87b69a54eeSKentaro Takeda static const char *tomoyo_dp_keyword[TOMOYO_MAX_DOUBLE_PATH_OPERATION] = { 88b69a54eeSKentaro Takeda [TOMOYO_TYPE_LINK_ACL] = "link", 89b69a54eeSKentaro Takeda [TOMOYO_TYPE_RENAME_ACL] = "rename", 90b69a54eeSKentaro Takeda }; 91b69a54eeSKentaro Takeda 92b69a54eeSKentaro Takeda /** 93b69a54eeSKentaro Takeda * tomoyo_sp2keyword - Get the name of single path operation. 94b69a54eeSKentaro Takeda * 95b69a54eeSKentaro Takeda * @operation: Type of operation. 96b69a54eeSKentaro Takeda * 97b69a54eeSKentaro Takeda * Returns the name of single path operation. 98b69a54eeSKentaro Takeda */ 99b69a54eeSKentaro Takeda const char *tomoyo_sp2keyword(const u8 operation) 100b69a54eeSKentaro Takeda { 101b69a54eeSKentaro Takeda return (operation < TOMOYO_MAX_SINGLE_PATH_OPERATION) 102b69a54eeSKentaro Takeda ? tomoyo_sp_keyword[operation] : NULL; 103b69a54eeSKentaro Takeda } 104b69a54eeSKentaro Takeda 105b69a54eeSKentaro Takeda /** 106b69a54eeSKentaro Takeda * tomoyo_dp2keyword - Get the name of double path operation. 107b69a54eeSKentaro Takeda * 108b69a54eeSKentaro Takeda * @operation: Type of operation. 109b69a54eeSKentaro Takeda * 110b69a54eeSKentaro Takeda * Returns the name of double path operation. 111b69a54eeSKentaro Takeda */ 112b69a54eeSKentaro Takeda const char *tomoyo_dp2keyword(const u8 operation) 113b69a54eeSKentaro Takeda { 114b69a54eeSKentaro Takeda return (operation < TOMOYO_MAX_DOUBLE_PATH_OPERATION) 115b69a54eeSKentaro Takeda ? tomoyo_dp_keyword[operation] : NULL; 116b69a54eeSKentaro Takeda } 117b69a54eeSKentaro Takeda 118b69a54eeSKentaro Takeda /** 119b69a54eeSKentaro Takeda * tomoyo_strendswith - Check whether the token ends with the given token. 120b69a54eeSKentaro Takeda * 121b69a54eeSKentaro Takeda * @name: The token to check. 122b69a54eeSKentaro Takeda * @tail: The token to find. 123b69a54eeSKentaro Takeda * 124b69a54eeSKentaro Takeda * Returns true if @name ends with @tail, false otherwise. 125b69a54eeSKentaro Takeda */ 126b69a54eeSKentaro Takeda static bool tomoyo_strendswith(const char *name, const char *tail) 127b69a54eeSKentaro Takeda { 128b69a54eeSKentaro Takeda int len; 129b69a54eeSKentaro Takeda 130b69a54eeSKentaro Takeda if (!name || !tail) 131b69a54eeSKentaro Takeda return false; 132b69a54eeSKentaro Takeda len = strlen(name) - strlen(tail); 133b69a54eeSKentaro Takeda return len >= 0 && !strcmp(name + len, tail); 134b69a54eeSKentaro Takeda } 135b69a54eeSKentaro Takeda 136b69a54eeSKentaro Takeda /** 137b69a54eeSKentaro Takeda * tomoyo_get_path - Get realpath. 138b69a54eeSKentaro Takeda * 139b69a54eeSKentaro Takeda * @path: Pointer to "struct path". 140b69a54eeSKentaro Takeda * 141b69a54eeSKentaro Takeda * Returns pointer to "struct tomoyo_path_info" on success, NULL otherwise. 142b69a54eeSKentaro Takeda */ 143b69a54eeSKentaro Takeda static struct tomoyo_path_info *tomoyo_get_path(struct path *path) 144b69a54eeSKentaro Takeda { 145b69a54eeSKentaro Takeda int error; 146b69a54eeSKentaro Takeda struct tomoyo_path_info_with_data *buf = tomoyo_alloc(sizeof(*buf)); 147b69a54eeSKentaro Takeda 148b69a54eeSKentaro Takeda if (!buf) 149b69a54eeSKentaro Takeda return NULL; 150b69a54eeSKentaro Takeda /* Reserve one byte for appending "/". */ 151b69a54eeSKentaro Takeda error = tomoyo_realpath_from_path2(path, buf->body, 152b69a54eeSKentaro Takeda sizeof(buf->body) - 2); 153b69a54eeSKentaro Takeda if (!error) { 154b69a54eeSKentaro Takeda buf->head.name = buf->body; 155b69a54eeSKentaro Takeda tomoyo_fill_path_info(&buf->head); 156b69a54eeSKentaro Takeda return &buf->head; 157b69a54eeSKentaro Takeda } 158b69a54eeSKentaro Takeda tomoyo_free(buf); 159b69a54eeSKentaro Takeda return NULL; 160b69a54eeSKentaro Takeda } 161b69a54eeSKentaro Takeda 162b69a54eeSKentaro Takeda /* Lock for domain->acl_info_list. */ 163b69a54eeSKentaro Takeda DECLARE_RWSEM(tomoyo_domain_acl_info_list_lock); 164b69a54eeSKentaro Takeda 165b69a54eeSKentaro Takeda static int tomoyo_update_double_path_acl(const u8 type, const char *filename1, 166b69a54eeSKentaro Takeda const char *filename2, 167b69a54eeSKentaro Takeda struct tomoyo_domain_info * 168b69a54eeSKentaro Takeda const domain, const bool is_delete); 169b69a54eeSKentaro Takeda static int tomoyo_update_single_path_acl(const u8 type, const char *filename, 170b69a54eeSKentaro Takeda struct tomoyo_domain_info * 171b69a54eeSKentaro Takeda const domain, const bool is_delete); 172b69a54eeSKentaro Takeda 173c3fa109aSTetsuo Handa /* 174c3fa109aSTetsuo Handa * tomoyo_globally_readable_list is used for holding list of pathnames which 175c3fa109aSTetsuo Handa * are by default allowed to be open()ed for reading by any process. 176c3fa109aSTetsuo Handa * 177c3fa109aSTetsuo Handa * An entry is added by 178c3fa109aSTetsuo Handa * 179c3fa109aSTetsuo Handa * # echo 'allow_read /lib/libc-2.5.so' > \ 180c3fa109aSTetsuo Handa * /sys/kernel/security/tomoyo/exception_policy 181c3fa109aSTetsuo Handa * 182c3fa109aSTetsuo Handa * and is deleted by 183c3fa109aSTetsuo Handa * 184c3fa109aSTetsuo Handa * # echo 'delete allow_read /lib/libc-2.5.so' > \ 185c3fa109aSTetsuo Handa * /sys/kernel/security/tomoyo/exception_policy 186c3fa109aSTetsuo Handa * 187c3fa109aSTetsuo Handa * and all entries are retrieved by 188c3fa109aSTetsuo Handa * 189c3fa109aSTetsuo Handa * # grep ^allow_read /sys/kernel/security/tomoyo/exception_policy 190c3fa109aSTetsuo Handa * 191c3fa109aSTetsuo Handa * In the example above, any process is allowed to 192c3fa109aSTetsuo Handa * open("/lib/libc-2.5.so", O_RDONLY). 193c3fa109aSTetsuo Handa * One exception is, if the domain which current process belongs to is marked 194c3fa109aSTetsuo Handa * as "ignore_global_allow_read", current process can't do so unless explicitly 195c3fa109aSTetsuo Handa * given "allow_read /lib/libc-2.5.so" to the domain which current process 196c3fa109aSTetsuo Handa * belongs to. 197c3fa109aSTetsuo Handa */ 198b69a54eeSKentaro Takeda static LIST_HEAD(tomoyo_globally_readable_list); 199b69a54eeSKentaro Takeda static DECLARE_RWSEM(tomoyo_globally_readable_list_lock); 200b69a54eeSKentaro Takeda 201b69a54eeSKentaro Takeda /** 202b69a54eeSKentaro Takeda * tomoyo_update_globally_readable_entry - Update "struct tomoyo_globally_readable_file_entry" list. 203b69a54eeSKentaro Takeda * 204b69a54eeSKentaro Takeda * @filename: Filename unconditionally permitted to open() for reading. 205b69a54eeSKentaro Takeda * @is_delete: True if it is a delete request. 206b69a54eeSKentaro Takeda * 207b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 208b69a54eeSKentaro Takeda */ 209b69a54eeSKentaro Takeda static int tomoyo_update_globally_readable_entry(const char *filename, 210b69a54eeSKentaro Takeda const bool is_delete) 211b69a54eeSKentaro Takeda { 212b69a54eeSKentaro Takeda struct tomoyo_globally_readable_file_entry *new_entry; 213b69a54eeSKentaro Takeda struct tomoyo_globally_readable_file_entry *ptr; 214b69a54eeSKentaro Takeda const struct tomoyo_path_info *saved_filename; 215b69a54eeSKentaro Takeda int error = -ENOMEM; 216b69a54eeSKentaro Takeda 217b69a54eeSKentaro Takeda if (!tomoyo_is_correct_path(filename, 1, 0, -1, __func__)) 218b69a54eeSKentaro Takeda return -EINVAL; 219b69a54eeSKentaro Takeda saved_filename = tomoyo_save_name(filename); 220b69a54eeSKentaro Takeda if (!saved_filename) 221b69a54eeSKentaro Takeda return -ENOMEM; 222b69a54eeSKentaro Takeda down_write(&tomoyo_globally_readable_list_lock); 223b69a54eeSKentaro Takeda list_for_each_entry(ptr, &tomoyo_globally_readable_list, list) { 224b69a54eeSKentaro Takeda if (ptr->filename != saved_filename) 225b69a54eeSKentaro Takeda continue; 226b69a54eeSKentaro Takeda ptr->is_deleted = is_delete; 227b69a54eeSKentaro Takeda error = 0; 228b69a54eeSKentaro Takeda goto out; 229b69a54eeSKentaro Takeda } 230b69a54eeSKentaro Takeda if (is_delete) { 231b69a54eeSKentaro Takeda error = -ENOENT; 232b69a54eeSKentaro Takeda goto out; 233b69a54eeSKentaro Takeda } 234b69a54eeSKentaro Takeda new_entry = tomoyo_alloc_element(sizeof(*new_entry)); 235b69a54eeSKentaro Takeda if (!new_entry) 236b69a54eeSKentaro Takeda goto out; 237b69a54eeSKentaro Takeda new_entry->filename = saved_filename; 238b69a54eeSKentaro Takeda list_add_tail(&new_entry->list, &tomoyo_globally_readable_list); 239b69a54eeSKentaro Takeda error = 0; 240b69a54eeSKentaro Takeda out: 241b69a54eeSKentaro Takeda up_write(&tomoyo_globally_readable_list_lock); 242b69a54eeSKentaro Takeda return error; 243b69a54eeSKentaro Takeda } 244b69a54eeSKentaro Takeda 245b69a54eeSKentaro Takeda /** 246b69a54eeSKentaro Takeda * tomoyo_is_globally_readable_file - Check if the file is unconditionnaly permitted to be open()ed for reading. 247b69a54eeSKentaro Takeda * 248b69a54eeSKentaro Takeda * @filename: The filename to check. 249b69a54eeSKentaro Takeda * 250b69a54eeSKentaro Takeda * Returns true if any domain can open @filename for reading, false otherwise. 251b69a54eeSKentaro Takeda */ 252b69a54eeSKentaro Takeda static bool tomoyo_is_globally_readable_file(const struct tomoyo_path_info * 253b69a54eeSKentaro Takeda filename) 254b69a54eeSKentaro Takeda { 255b69a54eeSKentaro Takeda struct tomoyo_globally_readable_file_entry *ptr; 256b69a54eeSKentaro Takeda bool found = false; 257b69a54eeSKentaro Takeda down_read(&tomoyo_globally_readable_list_lock); 258b69a54eeSKentaro Takeda list_for_each_entry(ptr, &tomoyo_globally_readable_list, list) { 259b69a54eeSKentaro Takeda if (!ptr->is_deleted && 260b69a54eeSKentaro Takeda tomoyo_path_matches_pattern(filename, ptr->filename)) { 261b69a54eeSKentaro Takeda found = true; 262b69a54eeSKentaro Takeda break; 263b69a54eeSKentaro Takeda } 264b69a54eeSKentaro Takeda } 265b69a54eeSKentaro Takeda up_read(&tomoyo_globally_readable_list_lock); 266b69a54eeSKentaro Takeda return found; 267b69a54eeSKentaro Takeda } 268b69a54eeSKentaro Takeda 269b69a54eeSKentaro Takeda /** 270b69a54eeSKentaro Takeda * tomoyo_write_globally_readable_policy - Write "struct tomoyo_globally_readable_file_entry" list. 271b69a54eeSKentaro Takeda * 272b69a54eeSKentaro Takeda * @data: String to parse. 273b69a54eeSKentaro Takeda * @is_delete: True if it is a delete request. 274b69a54eeSKentaro Takeda * 275b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 276b69a54eeSKentaro Takeda */ 277b69a54eeSKentaro Takeda int tomoyo_write_globally_readable_policy(char *data, const bool is_delete) 278b69a54eeSKentaro Takeda { 279b69a54eeSKentaro Takeda return tomoyo_update_globally_readable_entry(data, is_delete); 280b69a54eeSKentaro Takeda } 281b69a54eeSKentaro Takeda 282b69a54eeSKentaro Takeda /** 283b69a54eeSKentaro Takeda * tomoyo_read_globally_readable_policy - Read "struct tomoyo_globally_readable_file_entry" list. 284b69a54eeSKentaro Takeda * 285b69a54eeSKentaro Takeda * @head: Pointer to "struct tomoyo_io_buffer". 286b69a54eeSKentaro Takeda * 287b69a54eeSKentaro Takeda * Returns true on success, false otherwise. 288b69a54eeSKentaro Takeda */ 289b69a54eeSKentaro Takeda bool tomoyo_read_globally_readable_policy(struct tomoyo_io_buffer *head) 290b69a54eeSKentaro Takeda { 291b69a54eeSKentaro Takeda struct list_head *pos; 292b69a54eeSKentaro Takeda bool done = true; 293b69a54eeSKentaro Takeda 294b69a54eeSKentaro Takeda down_read(&tomoyo_globally_readable_list_lock); 295b69a54eeSKentaro Takeda list_for_each_cookie(pos, head->read_var2, 296b69a54eeSKentaro Takeda &tomoyo_globally_readable_list) { 297b69a54eeSKentaro Takeda struct tomoyo_globally_readable_file_entry *ptr; 298b69a54eeSKentaro Takeda ptr = list_entry(pos, 299b69a54eeSKentaro Takeda struct tomoyo_globally_readable_file_entry, 300b69a54eeSKentaro Takeda list); 301b69a54eeSKentaro Takeda if (ptr->is_deleted) 302b69a54eeSKentaro Takeda continue; 3037d2948b1STetsuo Handa done = tomoyo_io_printf(head, TOMOYO_KEYWORD_ALLOW_READ "%s\n", 3047d2948b1STetsuo Handa ptr->filename->name); 3057d2948b1STetsuo Handa if (!done) 306b69a54eeSKentaro Takeda break; 307b69a54eeSKentaro Takeda } 308b69a54eeSKentaro Takeda up_read(&tomoyo_globally_readable_list_lock); 309b69a54eeSKentaro Takeda return done; 310b69a54eeSKentaro Takeda } 311b69a54eeSKentaro Takeda 312c3fa109aSTetsuo Handa /* tomoyo_pattern_list is used for holding list of pathnames which are used for 313c3fa109aSTetsuo Handa * converting pathnames to pathname patterns during learning mode. 314c3fa109aSTetsuo Handa * 315c3fa109aSTetsuo Handa * An entry is added by 316c3fa109aSTetsuo Handa * 317c3fa109aSTetsuo Handa * # echo 'file_pattern /proc/\$/mounts' > \ 318c3fa109aSTetsuo Handa * /sys/kernel/security/tomoyo/exception_policy 319c3fa109aSTetsuo Handa * 320c3fa109aSTetsuo Handa * and is deleted by 321c3fa109aSTetsuo Handa * 322c3fa109aSTetsuo Handa * # echo 'delete file_pattern /proc/\$/mounts' > \ 323c3fa109aSTetsuo Handa * /sys/kernel/security/tomoyo/exception_policy 324c3fa109aSTetsuo Handa * 325c3fa109aSTetsuo Handa * and all entries are retrieved by 326c3fa109aSTetsuo Handa * 327c3fa109aSTetsuo Handa * # grep ^file_pattern /sys/kernel/security/tomoyo/exception_policy 328c3fa109aSTetsuo Handa * 329c3fa109aSTetsuo Handa * In the example above, if a process which belongs to a domain which is in 330c3fa109aSTetsuo Handa * learning mode requested open("/proc/1/mounts", O_RDONLY), 331c3fa109aSTetsuo Handa * "allow_read /proc/\$/mounts" is automatically added to the domain which that 332c3fa109aSTetsuo Handa * process belongs to. 333c3fa109aSTetsuo Handa * 334c3fa109aSTetsuo Handa * It is not a desirable behavior that we have to use /proc/\$/ instead of 335c3fa109aSTetsuo Handa * /proc/self/ when current process needs to access only current process's 336c3fa109aSTetsuo Handa * information. As of now, LSM version of TOMOYO is using __d_path() for 337c3fa109aSTetsuo Handa * calculating pathname. Non LSM version of TOMOYO is using its own function 338c3fa109aSTetsuo Handa * which pretends as if /proc/self/ is not a symlink; so that we can forbid 339c3fa109aSTetsuo Handa * current process from accessing other process's information. 340c3fa109aSTetsuo Handa */ 341b69a54eeSKentaro Takeda static LIST_HEAD(tomoyo_pattern_list); 342b69a54eeSKentaro Takeda static DECLARE_RWSEM(tomoyo_pattern_list_lock); 343b69a54eeSKentaro Takeda 344b69a54eeSKentaro Takeda /** 345b69a54eeSKentaro Takeda * tomoyo_update_file_pattern_entry - Update "struct tomoyo_pattern_entry" list. 346b69a54eeSKentaro Takeda * 347b69a54eeSKentaro Takeda * @pattern: Pathname pattern. 348b69a54eeSKentaro Takeda * @is_delete: True if it is a delete request. 349b69a54eeSKentaro Takeda * 350b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 351b69a54eeSKentaro Takeda */ 352b69a54eeSKentaro Takeda static int tomoyo_update_file_pattern_entry(const char *pattern, 353b69a54eeSKentaro Takeda const bool is_delete) 354b69a54eeSKentaro Takeda { 355b69a54eeSKentaro Takeda struct tomoyo_pattern_entry *new_entry; 356b69a54eeSKentaro Takeda struct tomoyo_pattern_entry *ptr; 357b69a54eeSKentaro Takeda const struct tomoyo_path_info *saved_pattern; 358b69a54eeSKentaro Takeda int error = -ENOMEM; 359b69a54eeSKentaro Takeda 360b69a54eeSKentaro Takeda if (!tomoyo_is_correct_path(pattern, 0, 1, 0, __func__)) 361b69a54eeSKentaro Takeda return -EINVAL; 362b69a54eeSKentaro Takeda saved_pattern = tomoyo_save_name(pattern); 363b69a54eeSKentaro Takeda if (!saved_pattern) 364b69a54eeSKentaro Takeda return -ENOMEM; 365b69a54eeSKentaro Takeda down_write(&tomoyo_pattern_list_lock); 366b69a54eeSKentaro Takeda list_for_each_entry(ptr, &tomoyo_pattern_list, list) { 367b69a54eeSKentaro Takeda if (saved_pattern != ptr->pattern) 368b69a54eeSKentaro Takeda continue; 369b69a54eeSKentaro Takeda ptr->is_deleted = is_delete; 370b69a54eeSKentaro Takeda error = 0; 371b69a54eeSKentaro Takeda goto out; 372b69a54eeSKentaro Takeda } 373b69a54eeSKentaro Takeda if (is_delete) { 374b69a54eeSKentaro Takeda error = -ENOENT; 375b69a54eeSKentaro Takeda goto out; 376b69a54eeSKentaro Takeda } 377b69a54eeSKentaro Takeda new_entry = tomoyo_alloc_element(sizeof(*new_entry)); 378b69a54eeSKentaro Takeda if (!new_entry) 379b69a54eeSKentaro Takeda goto out; 380b69a54eeSKentaro Takeda new_entry->pattern = saved_pattern; 381b69a54eeSKentaro Takeda list_add_tail(&new_entry->list, &tomoyo_pattern_list); 382b69a54eeSKentaro Takeda error = 0; 383b69a54eeSKentaro Takeda out: 384b69a54eeSKentaro Takeda up_write(&tomoyo_pattern_list_lock); 385b69a54eeSKentaro Takeda return error; 386b69a54eeSKentaro Takeda } 387b69a54eeSKentaro Takeda 388b69a54eeSKentaro Takeda /** 389b69a54eeSKentaro Takeda * tomoyo_get_file_pattern - Get patterned pathname. 390b69a54eeSKentaro Takeda * 391b69a54eeSKentaro Takeda * @filename: The filename to find patterned pathname. 392b69a54eeSKentaro Takeda * 393b69a54eeSKentaro Takeda * Returns pointer to pathname pattern if matched, @filename otherwise. 394b69a54eeSKentaro Takeda */ 395b69a54eeSKentaro Takeda static const struct tomoyo_path_info * 396b69a54eeSKentaro Takeda tomoyo_get_file_pattern(const struct tomoyo_path_info *filename) 397b69a54eeSKentaro Takeda { 398b69a54eeSKentaro Takeda struct tomoyo_pattern_entry *ptr; 399b69a54eeSKentaro Takeda const struct tomoyo_path_info *pattern = NULL; 400b69a54eeSKentaro Takeda 401b69a54eeSKentaro Takeda down_read(&tomoyo_pattern_list_lock); 402b69a54eeSKentaro Takeda list_for_each_entry(ptr, &tomoyo_pattern_list, list) { 403b69a54eeSKentaro Takeda if (ptr->is_deleted) 404b69a54eeSKentaro Takeda continue; 405b69a54eeSKentaro Takeda if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) 406b69a54eeSKentaro Takeda continue; 407b69a54eeSKentaro Takeda pattern = ptr->pattern; 408b69a54eeSKentaro Takeda if (tomoyo_strendswith(pattern->name, "/\\*")) { 409b69a54eeSKentaro Takeda /* Do nothing. Try to find the better match. */ 410b69a54eeSKentaro Takeda } else { 411b69a54eeSKentaro Takeda /* This would be the better match. Use this. */ 412b69a54eeSKentaro Takeda break; 413b69a54eeSKentaro Takeda } 414b69a54eeSKentaro Takeda } 415b69a54eeSKentaro Takeda up_read(&tomoyo_pattern_list_lock); 416b69a54eeSKentaro Takeda if (pattern) 417b69a54eeSKentaro Takeda filename = pattern; 418b69a54eeSKentaro Takeda return filename; 419b69a54eeSKentaro Takeda } 420b69a54eeSKentaro Takeda 421b69a54eeSKentaro Takeda /** 422b69a54eeSKentaro Takeda * tomoyo_write_pattern_policy - Write "struct tomoyo_pattern_entry" list. 423b69a54eeSKentaro Takeda * 424b69a54eeSKentaro Takeda * @data: String to parse. 425b69a54eeSKentaro Takeda * @is_delete: True if it is a delete request. 426b69a54eeSKentaro Takeda * 427b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 428b69a54eeSKentaro Takeda */ 429b69a54eeSKentaro Takeda int tomoyo_write_pattern_policy(char *data, const bool is_delete) 430b69a54eeSKentaro Takeda { 431b69a54eeSKentaro Takeda return tomoyo_update_file_pattern_entry(data, is_delete); 432b69a54eeSKentaro Takeda } 433b69a54eeSKentaro Takeda 434b69a54eeSKentaro Takeda /** 435b69a54eeSKentaro Takeda * tomoyo_read_file_pattern - Read "struct tomoyo_pattern_entry" list. 436b69a54eeSKentaro Takeda * 437b69a54eeSKentaro Takeda * @head: Pointer to "struct tomoyo_io_buffer". 438b69a54eeSKentaro Takeda * 439b69a54eeSKentaro Takeda * Returns true on success, false otherwise. 440b69a54eeSKentaro Takeda */ 441b69a54eeSKentaro Takeda bool tomoyo_read_file_pattern(struct tomoyo_io_buffer *head) 442b69a54eeSKentaro Takeda { 443b69a54eeSKentaro Takeda struct list_head *pos; 444b69a54eeSKentaro Takeda bool done = true; 445b69a54eeSKentaro Takeda 446b69a54eeSKentaro Takeda down_read(&tomoyo_pattern_list_lock); 447b69a54eeSKentaro Takeda list_for_each_cookie(pos, head->read_var2, &tomoyo_pattern_list) { 448b69a54eeSKentaro Takeda struct tomoyo_pattern_entry *ptr; 449b69a54eeSKentaro Takeda ptr = list_entry(pos, struct tomoyo_pattern_entry, list); 450b69a54eeSKentaro Takeda if (ptr->is_deleted) 451b69a54eeSKentaro Takeda continue; 4527d2948b1STetsuo Handa done = tomoyo_io_printf(head, TOMOYO_KEYWORD_FILE_PATTERN 4537d2948b1STetsuo Handa "%s\n", ptr->pattern->name); 4547d2948b1STetsuo Handa if (!done) 455b69a54eeSKentaro Takeda break; 456b69a54eeSKentaro Takeda } 457b69a54eeSKentaro Takeda up_read(&tomoyo_pattern_list_lock); 458b69a54eeSKentaro Takeda return done; 459b69a54eeSKentaro Takeda } 460b69a54eeSKentaro Takeda 461c3fa109aSTetsuo Handa /* 462c3fa109aSTetsuo Handa * tomoyo_no_rewrite_list is used for holding list of pathnames which are by 463c3fa109aSTetsuo Handa * default forbidden to modify already written content of a file. 464c3fa109aSTetsuo Handa * 465c3fa109aSTetsuo Handa * An entry is added by 466c3fa109aSTetsuo Handa * 467c3fa109aSTetsuo Handa * # echo 'deny_rewrite /var/log/messages' > \ 468c3fa109aSTetsuo Handa * /sys/kernel/security/tomoyo/exception_policy 469c3fa109aSTetsuo Handa * 470c3fa109aSTetsuo Handa * and is deleted by 471c3fa109aSTetsuo Handa * 472c3fa109aSTetsuo Handa * # echo 'delete deny_rewrite /var/log/messages' > \ 473c3fa109aSTetsuo Handa * /sys/kernel/security/tomoyo/exception_policy 474c3fa109aSTetsuo Handa * 475c3fa109aSTetsuo Handa * and all entries are retrieved by 476c3fa109aSTetsuo Handa * 477c3fa109aSTetsuo Handa * # grep ^deny_rewrite /sys/kernel/security/tomoyo/exception_policy 478c3fa109aSTetsuo Handa * 479c3fa109aSTetsuo Handa * In the example above, if a process requested to rewrite /var/log/messages , 480c3fa109aSTetsuo Handa * the process can't rewrite unless the domain which that process belongs to 481c3fa109aSTetsuo Handa * has "allow_rewrite /var/log/messages" entry. 482c3fa109aSTetsuo Handa * 483c3fa109aSTetsuo Handa * It is not a desirable behavior that we have to add "\040(deleted)" suffix 484c3fa109aSTetsuo Handa * when we want to allow rewriting already unlink()ed file. As of now, 485c3fa109aSTetsuo Handa * LSM version of TOMOYO is using __d_path() for calculating pathname. 486c3fa109aSTetsuo Handa * Non LSM version of TOMOYO is using its own function which doesn't append 487c3fa109aSTetsuo Handa * " (deleted)" suffix if the file is already unlink()ed; so that we don't 488c3fa109aSTetsuo Handa * need to worry whether the file is already unlink()ed or not. 489c3fa109aSTetsuo Handa */ 490b69a54eeSKentaro Takeda static LIST_HEAD(tomoyo_no_rewrite_list); 491b69a54eeSKentaro Takeda static DECLARE_RWSEM(tomoyo_no_rewrite_list_lock); 492b69a54eeSKentaro Takeda 493b69a54eeSKentaro Takeda /** 494b69a54eeSKentaro Takeda * tomoyo_update_no_rewrite_entry - Update "struct tomoyo_no_rewrite_entry" list. 495b69a54eeSKentaro Takeda * 496b69a54eeSKentaro Takeda * @pattern: Pathname pattern that are not rewritable by default. 497b69a54eeSKentaro Takeda * @is_delete: True if it is a delete request. 498b69a54eeSKentaro Takeda * 499b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 500b69a54eeSKentaro Takeda */ 501b69a54eeSKentaro Takeda static int tomoyo_update_no_rewrite_entry(const char *pattern, 502b69a54eeSKentaro Takeda const bool is_delete) 503b69a54eeSKentaro Takeda { 504b69a54eeSKentaro Takeda struct tomoyo_no_rewrite_entry *new_entry, *ptr; 505b69a54eeSKentaro Takeda const struct tomoyo_path_info *saved_pattern; 506b69a54eeSKentaro Takeda int error = -ENOMEM; 507b69a54eeSKentaro Takeda 508b69a54eeSKentaro Takeda if (!tomoyo_is_correct_path(pattern, 0, 0, 0, __func__)) 509b69a54eeSKentaro Takeda return -EINVAL; 510b69a54eeSKentaro Takeda saved_pattern = tomoyo_save_name(pattern); 511b69a54eeSKentaro Takeda if (!saved_pattern) 512b69a54eeSKentaro Takeda return -ENOMEM; 513b69a54eeSKentaro Takeda down_write(&tomoyo_no_rewrite_list_lock); 514b69a54eeSKentaro Takeda list_for_each_entry(ptr, &tomoyo_no_rewrite_list, list) { 515b69a54eeSKentaro Takeda if (ptr->pattern != saved_pattern) 516b69a54eeSKentaro Takeda continue; 517b69a54eeSKentaro Takeda ptr->is_deleted = is_delete; 518b69a54eeSKentaro Takeda error = 0; 519b69a54eeSKentaro Takeda goto out; 520b69a54eeSKentaro Takeda } 521b69a54eeSKentaro Takeda if (is_delete) { 522b69a54eeSKentaro Takeda error = -ENOENT; 523b69a54eeSKentaro Takeda goto out; 524b69a54eeSKentaro Takeda } 525b69a54eeSKentaro Takeda new_entry = tomoyo_alloc_element(sizeof(*new_entry)); 526b69a54eeSKentaro Takeda if (!new_entry) 527b69a54eeSKentaro Takeda goto out; 528b69a54eeSKentaro Takeda new_entry->pattern = saved_pattern; 529b69a54eeSKentaro Takeda list_add_tail(&new_entry->list, &tomoyo_no_rewrite_list); 530b69a54eeSKentaro Takeda error = 0; 531b69a54eeSKentaro Takeda out: 532b69a54eeSKentaro Takeda up_write(&tomoyo_no_rewrite_list_lock); 533b69a54eeSKentaro Takeda return error; 534b69a54eeSKentaro Takeda } 535b69a54eeSKentaro Takeda 536b69a54eeSKentaro Takeda /** 537b69a54eeSKentaro Takeda * tomoyo_is_no_rewrite_file - Check if the given pathname is not permitted to be rewrited. 538b69a54eeSKentaro Takeda * 539b69a54eeSKentaro Takeda * @filename: Filename to check. 540b69a54eeSKentaro Takeda * 541b69a54eeSKentaro Takeda * Returns true if @filename is specified by "deny_rewrite" directive, 542b69a54eeSKentaro Takeda * false otherwise. 543b69a54eeSKentaro Takeda */ 544b69a54eeSKentaro Takeda static bool tomoyo_is_no_rewrite_file(const struct tomoyo_path_info *filename) 545b69a54eeSKentaro Takeda { 546b69a54eeSKentaro Takeda struct tomoyo_no_rewrite_entry *ptr; 547b69a54eeSKentaro Takeda bool found = false; 548b69a54eeSKentaro Takeda 549b69a54eeSKentaro Takeda down_read(&tomoyo_no_rewrite_list_lock); 550b69a54eeSKentaro Takeda list_for_each_entry(ptr, &tomoyo_no_rewrite_list, list) { 551b69a54eeSKentaro Takeda if (ptr->is_deleted) 552b69a54eeSKentaro Takeda continue; 553b69a54eeSKentaro Takeda if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) 554b69a54eeSKentaro Takeda continue; 555b69a54eeSKentaro Takeda found = true; 556b69a54eeSKentaro Takeda break; 557b69a54eeSKentaro Takeda } 558b69a54eeSKentaro Takeda up_read(&tomoyo_no_rewrite_list_lock); 559b69a54eeSKentaro Takeda return found; 560b69a54eeSKentaro Takeda } 561b69a54eeSKentaro Takeda 562b69a54eeSKentaro Takeda /** 563b69a54eeSKentaro Takeda * tomoyo_write_no_rewrite_policy - Write "struct tomoyo_no_rewrite_entry" list. 564b69a54eeSKentaro Takeda * 565b69a54eeSKentaro Takeda * @data: String to parse. 566b69a54eeSKentaro Takeda * @is_delete: True if it is a delete request. 567b69a54eeSKentaro Takeda * 568b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 569b69a54eeSKentaro Takeda */ 570b69a54eeSKentaro Takeda int tomoyo_write_no_rewrite_policy(char *data, const bool is_delete) 571b69a54eeSKentaro Takeda { 572b69a54eeSKentaro Takeda return tomoyo_update_no_rewrite_entry(data, is_delete); 573b69a54eeSKentaro Takeda } 574b69a54eeSKentaro Takeda 575b69a54eeSKentaro Takeda /** 576b69a54eeSKentaro Takeda * tomoyo_read_no_rewrite_policy - Read "struct tomoyo_no_rewrite_entry" list. 577b69a54eeSKentaro Takeda * 578b69a54eeSKentaro Takeda * @head: Pointer to "struct tomoyo_io_buffer". 579b69a54eeSKentaro Takeda * 580b69a54eeSKentaro Takeda * Returns true on success, false otherwise. 581b69a54eeSKentaro Takeda */ 582b69a54eeSKentaro Takeda bool tomoyo_read_no_rewrite_policy(struct tomoyo_io_buffer *head) 583b69a54eeSKentaro Takeda { 584b69a54eeSKentaro Takeda struct list_head *pos; 585b69a54eeSKentaro Takeda bool done = true; 586b69a54eeSKentaro Takeda 587b69a54eeSKentaro Takeda down_read(&tomoyo_no_rewrite_list_lock); 588b69a54eeSKentaro Takeda list_for_each_cookie(pos, head->read_var2, &tomoyo_no_rewrite_list) { 589b69a54eeSKentaro Takeda struct tomoyo_no_rewrite_entry *ptr; 590b69a54eeSKentaro Takeda ptr = list_entry(pos, struct tomoyo_no_rewrite_entry, list); 591b69a54eeSKentaro Takeda if (ptr->is_deleted) 592b69a54eeSKentaro Takeda continue; 5937d2948b1STetsuo Handa done = tomoyo_io_printf(head, TOMOYO_KEYWORD_DENY_REWRITE 5947d2948b1STetsuo Handa "%s\n", ptr->pattern->name); 5957d2948b1STetsuo Handa if (!done) 596b69a54eeSKentaro Takeda break; 597b69a54eeSKentaro Takeda } 598b69a54eeSKentaro Takeda up_read(&tomoyo_no_rewrite_list_lock); 599b69a54eeSKentaro Takeda return done; 600b69a54eeSKentaro Takeda } 601b69a54eeSKentaro Takeda 602b69a54eeSKentaro Takeda /** 603b69a54eeSKentaro Takeda * tomoyo_update_file_acl - Update file's read/write/execute ACL. 604b69a54eeSKentaro Takeda * 605b69a54eeSKentaro Takeda * @filename: Filename. 606b69a54eeSKentaro Takeda * @perm: Permission (between 1 to 7). 607b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 608b69a54eeSKentaro Takeda * @is_delete: True if it is a delete request. 609b69a54eeSKentaro Takeda * 610b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 611b69a54eeSKentaro Takeda * 612b69a54eeSKentaro Takeda * This is legacy support interface for older policy syntax. 613b69a54eeSKentaro Takeda * Current policy syntax uses "allow_read/write" instead of "6", 614b69a54eeSKentaro Takeda * "allow_read" instead of "4", "allow_write" instead of "2", 615b69a54eeSKentaro Takeda * "allow_execute" instead of "1". 616b69a54eeSKentaro Takeda */ 617b69a54eeSKentaro Takeda static int tomoyo_update_file_acl(const char *filename, u8 perm, 618b69a54eeSKentaro Takeda struct tomoyo_domain_info * const domain, 619b69a54eeSKentaro Takeda const bool is_delete) 620b69a54eeSKentaro Takeda { 621b69a54eeSKentaro Takeda if (perm > 7 || !perm) { 622b69a54eeSKentaro Takeda printk(KERN_DEBUG "%s: Invalid permission '%d %s'\n", 623b69a54eeSKentaro Takeda __func__, perm, filename); 624b69a54eeSKentaro Takeda return -EINVAL; 625b69a54eeSKentaro Takeda } 626b69a54eeSKentaro Takeda if (filename[0] != '@' && tomoyo_strendswith(filename, "/")) 627b69a54eeSKentaro Takeda /* 628b69a54eeSKentaro Takeda * Only 'allow_mkdir' and 'allow_rmdir' are valid for 629b69a54eeSKentaro Takeda * directory permissions. 630b69a54eeSKentaro Takeda */ 631b69a54eeSKentaro Takeda return 0; 632b69a54eeSKentaro Takeda if (perm & 4) 633b69a54eeSKentaro Takeda tomoyo_update_single_path_acl(TOMOYO_TYPE_READ_ACL, filename, 634b69a54eeSKentaro Takeda domain, is_delete); 635b69a54eeSKentaro Takeda if (perm & 2) 636b69a54eeSKentaro Takeda tomoyo_update_single_path_acl(TOMOYO_TYPE_WRITE_ACL, filename, 637b69a54eeSKentaro Takeda domain, is_delete); 638b69a54eeSKentaro Takeda if (perm & 1) 639b69a54eeSKentaro Takeda tomoyo_update_single_path_acl(TOMOYO_TYPE_EXECUTE_ACL, 640b69a54eeSKentaro Takeda filename, domain, is_delete); 641b69a54eeSKentaro Takeda return 0; 642b69a54eeSKentaro Takeda } 643b69a54eeSKentaro Takeda 644b69a54eeSKentaro Takeda /** 645b69a54eeSKentaro Takeda * tomoyo_check_single_path_acl2 - Check permission for single path operation. 646b69a54eeSKentaro Takeda * 647b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 648b69a54eeSKentaro Takeda * @filename: Filename to check. 649b69a54eeSKentaro Takeda * @perm: Permission. 650b69a54eeSKentaro Takeda * @may_use_pattern: True if patterned ACL is permitted. 651b69a54eeSKentaro Takeda * 652b69a54eeSKentaro Takeda * Returns 0 on success, -EPERM otherwise. 653b69a54eeSKentaro Takeda */ 654b69a54eeSKentaro Takeda static int tomoyo_check_single_path_acl2(const struct tomoyo_domain_info * 655b69a54eeSKentaro Takeda domain, 656b69a54eeSKentaro Takeda const struct tomoyo_path_info * 657b69a54eeSKentaro Takeda filename, 658b69a54eeSKentaro Takeda const u16 perm, 659b69a54eeSKentaro Takeda const bool may_use_pattern) 660b69a54eeSKentaro Takeda { 661b69a54eeSKentaro Takeda struct tomoyo_acl_info *ptr; 662b69a54eeSKentaro Takeda int error = -EPERM; 663b69a54eeSKentaro Takeda 664b69a54eeSKentaro Takeda down_read(&tomoyo_domain_acl_info_list_lock); 665b69a54eeSKentaro Takeda list_for_each_entry(ptr, &domain->acl_info_list, list) { 666b69a54eeSKentaro Takeda struct tomoyo_single_path_acl_record *acl; 667b69a54eeSKentaro Takeda if (tomoyo_acl_type2(ptr) != TOMOYO_TYPE_SINGLE_PATH_ACL) 668b69a54eeSKentaro Takeda continue; 669b69a54eeSKentaro Takeda acl = container_of(ptr, struct tomoyo_single_path_acl_record, 670b69a54eeSKentaro Takeda head); 671b69a54eeSKentaro Takeda if (!(acl->perm & perm)) 672b69a54eeSKentaro Takeda continue; 673b69a54eeSKentaro Takeda if (may_use_pattern || !acl->filename->is_patterned) { 674b69a54eeSKentaro Takeda if (!tomoyo_path_matches_pattern(filename, 675b69a54eeSKentaro Takeda acl->filename)) 676b69a54eeSKentaro Takeda continue; 677b69a54eeSKentaro Takeda } else { 678b69a54eeSKentaro Takeda continue; 679b69a54eeSKentaro Takeda } 680b69a54eeSKentaro Takeda error = 0; 681b69a54eeSKentaro Takeda break; 682b69a54eeSKentaro Takeda } 683b69a54eeSKentaro Takeda up_read(&tomoyo_domain_acl_info_list_lock); 684b69a54eeSKentaro Takeda return error; 685b69a54eeSKentaro Takeda } 686b69a54eeSKentaro Takeda 687b69a54eeSKentaro Takeda /** 688b69a54eeSKentaro Takeda * tomoyo_check_file_acl - Check permission for opening files. 689b69a54eeSKentaro Takeda * 690b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 691b69a54eeSKentaro Takeda * @filename: Filename to check. 692b69a54eeSKentaro Takeda * @operation: Mode ("read" or "write" or "read/write" or "execute"). 693b69a54eeSKentaro Takeda * 694b69a54eeSKentaro Takeda * Returns 0 on success, -EPERM otherwise. 695b69a54eeSKentaro Takeda */ 696b69a54eeSKentaro Takeda static int tomoyo_check_file_acl(const struct tomoyo_domain_info *domain, 697b69a54eeSKentaro Takeda const struct tomoyo_path_info *filename, 698b69a54eeSKentaro Takeda const u8 operation) 699b69a54eeSKentaro Takeda { 700b69a54eeSKentaro Takeda u16 perm = 0; 701b69a54eeSKentaro Takeda 702b69a54eeSKentaro Takeda if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE)) 703b69a54eeSKentaro Takeda return 0; 704b69a54eeSKentaro Takeda if (operation == 6) 705b69a54eeSKentaro Takeda perm = 1 << TOMOYO_TYPE_READ_WRITE_ACL; 706b69a54eeSKentaro Takeda else if (operation == 4) 707b69a54eeSKentaro Takeda perm = 1 << TOMOYO_TYPE_READ_ACL; 708b69a54eeSKentaro Takeda else if (operation == 2) 709b69a54eeSKentaro Takeda perm = 1 << TOMOYO_TYPE_WRITE_ACL; 710b69a54eeSKentaro Takeda else if (operation == 1) 711b69a54eeSKentaro Takeda perm = 1 << TOMOYO_TYPE_EXECUTE_ACL; 712b69a54eeSKentaro Takeda else 713b69a54eeSKentaro Takeda BUG(); 714b69a54eeSKentaro Takeda return tomoyo_check_single_path_acl2(domain, filename, perm, 715b69a54eeSKentaro Takeda operation != 1); 716b69a54eeSKentaro Takeda } 717b69a54eeSKentaro Takeda 718b69a54eeSKentaro Takeda /** 719b69a54eeSKentaro Takeda * tomoyo_check_file_perm2 - Check permission for opening files. 720b69a54eeSKentaro Takeda * 721b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 722b69a54eeSKentaro Takeda * @filename: Filename to check. 723b69a54eeSKentaro Takeda * @perm: Mode ("read" or "write" or "read/write" or "execute"). 724b69a54eeSKentaro Takeda * @operation: Operation name passed used for verbose mode. 725b69a54eeSKentaro Takeda * @mode: Access control mode. 726b69a54eeSKentaro Takeda * 727b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 728b69a54eeSKentaro Takeda */ 729b69a54eeSKentaro Takeda static int tomoyo_check_file_perm2(struct tomoyo_domain_info * const domain, 730b69a54eeSKentaro Takeda const struct tomoyo_path_info *filename, 731b69a54eeSKentaro Takeda const u8 perm, const char *operation, 732b69a54eeSKentaro Takeda const u8 mode) 733b69a54eeSKentaro Takeda { 734b69a54eeSKentaro Takeda const bool is_enforce = (mode == 3); 735b69a54eeSKentaro Takeda const char *msg = "<unknown>"; 736b69a54eeSKentaro Takeda int error = 0; 737b69a54eeSKentaro Takeda 738b69a54eeSKentaro Takeda if (!filename) 739b69a54eeSKentaro Takeda return 0; 740b69a54eeSKentaro Takeda error = tomoyo_check_file_acl(domain, filename, perm); 741b69a54eeSKentaro Takeda if (error && perm == 4 && 742b69a54eeSKentaro Takeda (domain->flags & TOMOYO_DOMAIN_FLAGS_IGNORE_GLOBAL_ALLOW_READ) == 0 743b69a54eeSKentaro Takeda && tomoyo_is_globally_readable_file(filename)) 744b69a54eeSKentaro Takeda error = 0; 745b69a54eeSKentaro Takeda if (perm == 6) 746b69a54eeSKentaro Takeda msg = tomoyo_sp2keyword(TOMOYO_TYPE_READ_WRITE_ACL); 747b69a54eeSKentaro Takeda else if (perm == 4) 748b69a54eeSKentaro Takeda msg = tomoyo_sp2keyword(TOMOYO_TYPE_READ_ACL); 749b69a54eeSKentaro Takeda else if (perm == 2) 750b69a54eeSKentaro Takeda msg = tomoyo_sp2keyword(TOMOYO_TYPE_WRITE_ACL); 751b69a54eeSKentaro Takeda else if (perm == 1) 752b69a54eeSKentaro Takeda msg = tomoyo_sp2keyword(TOMOYO_TYPE_EXECUTE_ACL); 753b69a54eeSKentaro Takeda else 754b69a54eeSKentaro Takeda BUG(); 755b69a54eeSKentaro Takeda if (!error) 756b69a54eeSKentaro Takeda return 0; 757b69a54eeSKentaro Takeda if (tomoyo_verbose_mode(domain)) 758b69a54eeSKentaro Takeda printk(KERN_WARNING "TOMOYO-%s: Access '%s(%s) %s' denied " 759b69a54eeSKentaro Takeda "for %s\n", tomoyo_get_msg(is_enforce), msg, operation, 760b69a54eeSKentaro Takeda filename->name, tomoyo_get_last_name(domain)); 761b69a54eeSKentaro Takeda if (is_enforce) 762b69a54eeSKentaro Takeda return error; 763b69a54eeSKentaro Takeda if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) { 764b69a54eeSKentaro Takeda /* Don't use patterns for execute permission. */ 765b69a54eeSKentaro Takeda const struct tomoyo_path_info *patterned_file = (perm != 1) ? 766b69a54eeSKentaro Takeda tomoyo_get_file_pattern(filename) : filename; 767b69a54eeSKentaro Takeda tomoyo_update_file_acl(patterned_file->name, perm, 768b69a54eeSKentaro Takeda domain, false); 769b69a54eeSKentaro Takeda } 770b69a54eeSKentaro Takeda return 0; 771b69a54eeSKentaro Takeda } 772b69a54eeSKentaro Takeda 773b69a54eeSKentaro Takeda /** 774b69a54eeSKentaro Takeda * tomoyo_write_file_policy - Update file related list. 775b69a54eeSKentaro Takeda * 776b69a54eeSKentaro Takeda * @data: String to parse. 777b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 778b69a54eeSKentaro Takeda * @is_delete: True if it is a delete request. 779b69a54eeSKentaro Takeda * 780b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 781b69a54eeSKentaro Takeda */ 782b69a54eeSKentaro Takeda int tomoyo_write_file_policy(char *data, struct tomoyo_domain_info *domain, 783b69a54eeSKentaro Takeda const bool is_delete) 784b69a54eeSKentaro Takeda { 785b69a54eeSKentaro Takeda char *filename = strchr(data, ' '); 786b69a54eeSKentaro Takeda char *filename2; 787b69a54eeSKentaro Takeda unsigned int perm; 788b69a54eeSKentaro Takeda u8 type; 789b69a54eeSKentaro Takeda 790b69a54eeSKentaro Takeda if (!filename) 791b69a54eeSKentaro Takeda return -EINVAL; 792b69a54eeSKentaro Takeda *filename++ = '\0'; 793b69a54eeSKentaro Takeda if (sscanf(data, "%u", &perm) == 1) 794b69a54eeSKentaro Takeda return tomoyo_update_file_acl(filename, (u8) perm, domain, 795b69a54eeSKentaro Takeda is_delete); 796b69a54eeSKentaro Takeda if (strncmp(data, "allow_", 6)) 797b69a54eeSKentaro Takeda goto out; 798b69a54eeSKentaro Takeda data += 6; 799b69a54eeSKentaro Takeda for (type = 0; type < TOMOYO_MAX_SINGLE_PATH_OPERATION; type++) { 800b69a54eeSKentaro Takeda if (strcmp(data, tomoyo_sp_keyword[type])) 801b69a54eeSKentaro Takeda continue; 802b69a54eeSKentaro Takeda return tomoyo_update_single_path_acl(type, filename, 803b69a54eeSKentaro Takeda domain, is_delete); 804b69a54eeSKentaro Takeda } 805b69a54eeSKentaro Takeda filename2 = strchr(filename, ' '); 806b69a54eeSKentaro Takeda if (!filename2) 807b69a54eeSKentaro Takeda goto out; 808b69a54eeSKentaro Takeda *filename2++ = '\0'; 809b69a54eeSKentaro Takeda for (type = 0; type < TOMOYO_MAX_DOUBLE_PATH_OPERATION; type++) { 810b69a54eeSKentaro Takeda if (strcmp(data, tomoyo_dp_keyword[type])) 811b69a54eeSKentaro Takeda continue; 812b69a54eeSKentaro Takeda return tomoyo_update_double_path_acl(type, filename, filename2, 813b69a54eeSKentaro Takeda domain, is_delete); 814b69a54eeSKentaro Takeda } 815b69a54eeSKentaro Takeda out: 816b69a54eeSKentaro Takeda return -EINVAL; 817b69a54eeSKentaro Takeda } 818b69a54eeSKentaro Takeda 819b69a54eeSKentaro Takeda /** 820b69a54eeSKentaro Takeda * tomoyo_update_single_path_acl - Update "struct tomoyo_single_path_acl_record" list. 821b69a54eeSKentaro Takeda * 822b69a54eeSKentaro Takeda * @type: Type of operation. 823b69a54eeSKentaro Takeda * @filename: Filename. 824b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 825b69a54eeSKentaro Takeda * @is_delete: True if it is a delete request. 826b69a54eeSKentaro Takeda * 827b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 828b69a54eeSKentaro Takeda */ 829b69a54eeSKentaro Takeda static int tomoyo_update_single_path_acl(const u8 type, const char *filename, 830b69a54eeSKentaro Takeda struct tomoyo_domain_info * 831b69a54eeSKentaro Takeda const domain, const bool is_delete) 832b69a54eeSKentaro Takeda { 833b69a54eeSKentaro Takeda static const u16 rw_mask = 834b69a54eeSKentaro Takeda (1 << TOMOYO_TYPE_READ_ACL) | (1 << TOMOYO_TYPE_WRITE_ACL); 835b69a54eeSKentaro Takeda const struct tomoyo_path_info *saved_filename; 836b69a54eeSKentaro Takeda struct tomoyo_acl_info *ptr; 837b69a54eeSKentaro Takeda struct tomoyo_single_path_acl_record *acl; 838b69a54eeSKentaro Takeda int error = -ENOMEM; 839b69a54eeSKentaro Takeda const u16 perm = 1 << type; 840b69a54eeSKentaro Takeda 841b69a54eeSKentaro Takeda if (!domain) 842b69a54eeSKentaro Takeda return -EINVAL; 843b69a54eeSKentaro Takeda if (!tomoyo_is_correct_path(filename, 0, 0, 0, __func__)) 844b69a54eeSKentaro Takeda return -EINVAL; 845b69a54eeSKentaro Takeda saved_filename = tomoyo_save_name(filename); 846b69a54eeSKentaro Takeda if (!saved_filename) 847b69a54eeSKentaro Takeda return -ENOMEM; 848b69a54eeSKentaro Takeda down_write(&tomoyo_domain_acl_info_list_lock); 849b69a54eeSKentaro Takeda if (is_delete) 850b69a54eeSKentaro Takeda goto delete; 851b69a54eeSKentaro Takeda list_for_each_entry(ptr, &domain->acl_info_list, list) { 852b69a54eeSKentaro Takeda if (tomoyo_acl_type1(ptr) != TOMOYO_TYPE_SINGLE_PATH_ACL) 853b69a54eeSKentaro Takeda continue; 854b69a54eeSKentaro Takeda acl = container_of(ptr, struct tomoyo_single_path_acl_record, 855b69a54eeSKentaro Takeda head); 856b69a54eeSKentaro Takeda if (acl->filename != saved_filename) 857b69a54eeSKentaro Takeda continue; 858b69a54eeSKentaro Takeda /* Special case. Clear all bits if marked as deleted. */ 859b69a54eeSKentaro Takeda if (ptr->type & TOMOYO_ACL_DELETED) 860b69a54eeSKentaro Takeda acl->perm = 0; 861b69a54eeSKentaro Takeda acl->perm |= perm; 862b69a54eeSKentaro Takeda if ((acl->perm & rw_mask) == rw_mask) 863b69a54eeSKentaro Takeda acl->perm |= 1 << TOMOYO_TYPE_READ_WRITE_ACL; 864b69a54eeSKentaro Takeda else if (acl->perm & (1 << TOMOYO_TYPE_READ_WRITE_ACL)) 865b69a54eeSKentaro Takeda acl->perm |= rw_mask; 866b69a54eeSKentaro Takeda ptr->type &= ~TOMOYO_ACL_DELETED; 867b69a54eeSKentaro Takeda error = 0; 868b69a54eeSKentaro Takeda goto out; 869b69a54eeSKentaro Takeda } 870b69a54eeSKentaro Takeda /* Not found. Append it to the tail. */ 871b69a54eeSKentaro Takeda acl = tomoyo_alloc_acl_element(TOMOYO_TYPE_SINGLE_PATH_ACL); 872b69a54eeSKentaro Takeda if (!acl) 873b69a54eeSKentaro Takeda goto out; 874b69a54eeSKentaro Takeda acl->perm = perm; 875b69a54eeSKentaro Takeda if (perm == (1 << TOMOYO_TYPE_READ_WRITE_ACL)) 876b69a54eeSKentaro Takeda acl->perm |= rw_mask; 877b69a54eeSKentaro Takeda acl->filename = saved_filename; 878b69a54eeSKentaro Takeda list_add_tail(&acl->head.list, &domain->acl_info_list); 879b69a54eeSKentaro Takeda error = 0; 880b69a54eeSKentaro Takeda goto out; 881b69a54eeSKentaro Takeda delete: 882b69a54eeSKentaro Takeda error = -ENOENT; 883b69a54eeSKentaro Takeda list_for_each_entry(ptr, &domain->acl_info_list, list) { 884b69a54eeSKentaro Takeda if (tomoyo_acl_type2(ptr) != TOMOYO_TYPE_SINGLE_PATH_ACL) 885b69a54eeSKentaro Takeda continue; 886b69a54eeSKentaro Takeda acl = container_of(ptr, struct tomoyo_single_path_acl_record, 887b69a54eeSKentaro Takeda head); 888b69a54eeSKentaro Takeda if (acl->filename != saved_filename) 889b69a54eeSKentaro Takeda continue; 890b69a54eeSKentaro Takeda acl->perm &= ~perm; 891b69a54eeSKentaro Takeda if ((acl->perm & rw_mask) != rw_mask) 892b69a54eeSKentaro Takeda acl->perm &= ~(1 << TOMOYO_TYPE_READ_WRITE_ACL); 893b69a54eeSKentaro Takeda else if (!(acl->perm & (1 << TOMOYO_TYPE_READ_WRITE_ACL))) 894b69a54eeSKentaro Takeda acl->perm &= ~rw_mask; 895b69a54eeSKentaro Takeda if (!acl->perm) 896b69a54eeSKentaro Takeda ptr->type |= TOMOYO_ACL_DELETED; 897b69a54eeSKentaro Takeda error = 0; 898b69a54eeSKentaro Takeda break; 899b69a54eeSKentaro Takeda } 900b69a54eeSKentaro Takeda out: 901b69a54eeSKentaro Takeda up_write(&tomoyo_domain_acl_info_list_lock); 902b69a54eeSKentaro Takeda return error; 903b69a54eeSKentaro Takeda } 904b69a54eeSKentaro Takeda 905b69a54eeSKentaro Takeda /** 906b69a54eeSKentaro Takeda * tomoyo_update_double_path_acl - Update "struct tomoyo_double_path_acl_record" list. 907b69a54eeSKentaro Takeda * 908b69a54eeSKentaro Takeda * @type: Type of operation. 909b69a54eeSKentaro Takeda * @filename1: First filename. 910b69a54eeSKentaro Takeda * @filename2: Second filename. 911b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 912b69a54eeSKentaro Takeda * @is_delete: True if it is a delete request. 913b69a54eeSKentaro Takeda * 914b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 915b69a54eeSKentaro Takeda */ 916b69a54eeSKentaro Takeda static int tomoyo_update_double_path_acl(const u8 type, const char *filename1, 917b69a54eeSKentaro Takeda const char *filename2, 918b69a54eeSKentaro Takeda struct tomoyo_domain_info * 919b69a54eeSKentaro Takeda const domain, const bool is_delete) 920b69a54eeSKentaro Takeda { 921b69a54eeSKentaro Takeda const struct tomoyo_path_info *saved_filename1; 922b69a54eeSKentaro Takeda const struct tomoyo_path_info *saved_filename2; 923b69a54eeSKentaro Takeda struct tomoyo_acl_info *ptr; 924b69a54eeSKentaro Takeda struct tomoyo_double_path_acl_record *acl; 925b69a54eeSKentaro Takeda int error = -ENOMEM; 926b69a54eeSKentaro Takeda const u8 perm = 1 << type; 927b69a54eeSKentaro Takeda 928b69a54eeSKentaro Takeda if (!domain) 929b69a54eeSKentaro Takeda return -EINVAL; 930b69a54eeSKentaro Takeda if (!tomoyo_is_correct_path(filename1, 0, 0, 0, __func__) || 931b69a54eeSKentaro Takeda !tomoyo_is_correct_path(filename2, 0, 0, 0, __func__)) 932b69a54eeSKentaro Takeda return -EINVAL; 933b69a54eeSKentaro Takeda saved_filename1 = tomoyo_save_name(filename1); 934b69a54eeSKentaro Takeda saved_filename2 = tomoyo_save_name(filename2); 935b69a54eeSKentaro Takeda if (!saved_filename1 || !saved_filename2) 936b69a54eeSKentaro Takeda return -ENOMEM; 937b69a54eeSKentaro Takeda down_write(&tomoyo_domain_acl_info_list_lock); 938b69a54eeSKentaro Takeda if (is_delete) 939b69a54eeSKentaro Takeda goto delete; 940b69a54eeSKentaro Takeda list_for_each_entry(ptr, &domain->acl_info_list, list) { 941b69a54eeSKentaro Takeda if (tomoyo_acl_type1(ptr) != TOMOYO_TYPE_DOUBLE_PATH_ACL) 942b69a54eeSKentaro Takeda continue; 943b69a54eeSKentaro Takeda acl = container_of(ptr, struct tomoyo_double_path_acl_record, 944b69a54eeSKentaro Takeda head); 945b69a54eeSKentaro Takeda if (acl->filename1 != saved_filename1 || 946b69a54eeSKentaro Takeda acl->filename2 != saved_filename2) 947b69a54eeSKentaro Takeda continue; 948b69a54eeSKentaro Takeda /* Special case. Clear all bits if marked as deleted. */ 949b69a54eeSKentaro Takeda if (ptr->type & TOMOYO_ACL_DELETED) 950b69a54eeSKentaro Takeda acl->perm = 0; 951b69a54eeSKentaro Takeda acl->perm |= perm; 952b69a54eeSKentaro Takeda ptr->type &= ~TOMOYO_ACL_DELETED; 953b69a54eeSKentaro Takeda error = 0; 954b69a54eeSKentaro Takeda goto out; 955b69a54eeSKentaro Takeda } 956b69a54eeSKentaro Takeda /* Not found. Append it to the tail. */ 957b69a54eeSKentaro Takeda acl = tomoyo_alloc_acl_element(TOMOYO_TYPE_DOUBLE_PATH_ACL); 958b69a54eeSKentaro Takeda if (!acl) 959b69a54eeSKentaro Takeda goto out; 960b69a54eeSKentaro Takeda acl->perm = perm; 961b69a54eeSKentaro Takeda acl->filename1 = saved_filename1; 962b69a54eeSKentaro Takeda acl->filename2 = saved_filename2; 963b69a54eeSKentaro Takeda list_add_tail(&acl->head.list, &domain->acl_info_list); 964b69a54eeSKentaro Takeda error = 0; 965b69a54eeSKentaro Takeda goto out; 966b69a54eeSKentaro Takeda delete: 967b69a54eeSKentaro Takeda error = -ENOENT; 968b69a54eeSKentaro Takeda list_for_each_entry(ptr, &domain->acl_info_list, list) { 969b69a54eeSKentaro Takeda if (tomoyo_acl_type2(ptr) != TOMOYO_TYPE_DOUBLE_PATH_ACL) 970b69a54eeSKentaro Takeda continue; 971b69a54eeSKentaro Takeda acl = container_of(ptr, struct tomoyo_double_path_acl_record, 972b69a54eeSKentaro Takeda head); 973b69a54eeSKentaro Takeda if (acl->filename1 != saved_filename1 || 974b69a54eeSKentaro Takeda acl->filename2 != saved_filename2) 975b69a54eeSKentaro Takeda continue; 976b69a54eeSKentaro Takeda acl->perm &= ~perm; 977b69a54eeSKentaro Takeda if (!acl->perm) 978b69a54eeSKentaro Takeda ptr->type |= TOMOYO_ACL_DELETED; 979b69a54eeSKentaro Takeda error = 0; 980b69a54eeSKentaro Takeda break; 981b69a54eeSKentaro Takeda } 982b69a54eeSKentaro Takeda out: 983b69a54eeSKentaro Takeda up_write(&tomoyo_domain_acl_info_list_lock); 984b69a54eeSKentaro Takeda return error; 985b69a54eeSKentaro Takeda } 986b69a54eeSKentaro Takeda 987b69a54eeSKentaro Takeda /** 988b69a54eeSKentaro Takeda * tomoyo_check_single_path_acl - Check permission for single path operation. 989b69a54eeSKentaro Takeda * 990b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 991b69a54eeSKentaro Takeda * @type: Type of operation. 992b69a54eeSKentaro Takeda * @filename: Filename to check. 993b69a54eeSKentaro Takeda * 994b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 995b69a54eeSKentaro Takeda */ 996b69a54eeSKentaro Takeda static int tomoyo_check_single_path_acl(struct tomoyo_domain_info *domain, 997b69a54eeSKentaro Takeda const u8 type, 998b69a54eeSKentaro Takeda const struct tomoyo_path_info *filename) 999b69a54eeSKentaro Takeda { 1000b69a54eeSKentaro Takeda if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE)) 1001b69a54eeSKentaro Takeda return 0; 1002b69a54eeSKentaro Takeda return tomoyo_check_single_path_acl2(domain, filename, 1 << type, 1); 1003b69a54eeSKentaro Takeda } 1004b69a54eeSKentaro Takeda 1005b69a54eeSKentaro Takeda /** 1006b69a54eeSKentaro Takeda * tomoyo_check_double_path_acl - Check permission for double path operation. 1007b69a54eeSKentaro Takeda * 1008b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 1009b69a54eeSKentaro Takeda * @type: Type of operation. 1010b69a54eeSKentaro Takeda * @filename1: First filename to check. 1011b69a54eeSKentaro Takeda * @filename2: Second filename to check. 1012b69a54eeSKentaro Takeda * 1013b69a54eeSKentaro Takeda * Returns 0 on success, -EPERM otherwise. 1014b69a54eeSKentaro Takeda */ 1015b69a54eeSKentaro Takeda static int tomoyo_check_double_path_acl(const struct tomoyo_domain_info *domain, 1016b69a54eeSKentaro Takeda const u8 type, 1017b69a54eeSKentaro Takeda const struct tomoyo_path_info * 1018b69a54eeSKentaro Takeda filename1, 1019b69a54eeSKentaro Takeda const struct tomoyo_path_info * 1020b69a54eeSKentaro Takeda filename2) 1021b69a54eeSKentaro Takeda { 1022b69a54eeSKentaro Takeda struct tomoyo_acl_info *ptr; 1023b69a54eeSKentaro Takeda const u8 perm = 1 << type; 1024b69a54eeSKentaro Takeda int error = -EPERM; 1025b69a54eeSKentaro Takeda 1026b69a54eeSKentaro Takeda if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE)) 1027b69a54eeSKentaro Takeda return 0; 1028b69a54eeSKentaro Takeda down_read(&tomoyo_domain_acl_info_list_lock); 1029b69a54eeSKentaro Takeda list_for_each_entry(ptr, &domain->acl_info_list, list) { 1030b69a54eeSKentaro Takeda struct tomoyo_double_path_acl_record *acl; 1031b69a54eeSKentaro Takeda if (tomoyo_acl_type2(ptr) != TOMOYO_TYPE_DOUBLE_PATH_ACL) 1032b69a54eeSKentaro Takeda continue; 1033b69a54eeSKentaro Takeda acl = container_of(ptr, struct tomoyo_double_path_acl_record, 1034b69a54eeSKentaro Takeda head); 1035b69a54eeSKentaro Takeda if (!(acl->perm & perm)) 1036b69a54eeSKentaro Takeda continue; 1037b69a54eeSKentaro Takeda if (!tomoyo_path_matches_pattern(filename1, acl->filename1)) 1038b69a54eeSKentaro Takeda continue; 1039b69a54eeSKentaro Takeda if (!tomoyo_path_matches_pattern(filename2, acl->filename2)) 1040b69a54eeSKentaro Takeda continue; 1041b69a54eeSKentaro Takeda error = 0; 1042b69a54eeSKentaro Takeda break; 1043b69a54eeSKentaro Takeda } 1044b69a54eeSKentaro Takeda up_read(&tomoyo_domain_acl_info_list_lock); 1045b69a54eeSKentaro Takeda return error; 1046b69a54eeSKentaro Takeda } 1047b69a54eeSKentaro Takeda 1048b69a54eeSKentaro Takeda /** 1049b69a54eeSKentaro Takeda * tomoyo_check_single_path_permission2 - Check permission for single path operation. 1050b69a54eeSKentaro Takeda * 1051b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 1052b69a54eeSKentaro Takeda * @operation: Type of operation. 1053b69a54eeSKentaro Takeda * @filename: Filename to check. 1054b69a54eeSKentaro Takeda * @mode: Access control mode. 1055b69a54eeSKentaro Takeda * 1056b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 1057b69a54eeSKentaro Takeda */ 1058b69a54eeSKentaro Takeda static int tomoyo_check_single_path_permission2(struct tomoyo_domain_info * 1059b69a54eeSKentaro Takeda const domain, u8 operation, 1060b69a54eeSKentaro Takeda const struct tomoyo_path_info * 1061b69a54eeSKentaro Takeda filename, const u8 mode) 1062b69a54eeSKentaro Takeda { 1063b69a54eeSKentaro Takeda const char *msg; 1064b69a54eeSKentaro Takeda int error; 1065b69a54eeSKentaro Takeda const bool is_enforce = (mode == 3); 1066b69a54eeSKentaro Takeda 1067b69a54eeSKentaro Takeda if (!mode) 1068b69a54eeSKentaro Takeda return 0; 1069b69a54eeSKentaro Takeda next: 1070b69a54eeSKentaro Takeda error = tomoyo_check_single_path_acl(domain, operation, filename); 1071b69a54eeSKentaro Takeda msg = tomoyo_sp2keyword(operation); 1072b69a54eeSKentaro Takeda if (!error) 1073b69a54eeSKentaro Takeda goto ok; 1074b69a54eeSKentaro Takeda if (tomoyo_verbose_mode(domain)) 1075b69a54eeSKentaro Takeda printk(KERN_WARNING "TOMOYO-%s: Access '%s %s' denied for %s\n", 1076b69a54eeSKentaro Takeda tomoyo_get_msg(is_enforce), msg, filename->name, 1077b69a54eeSKentaro Takeda tomoyo_get_last_name(domain)); 1078b69a54eeSKentaro Takeda if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) { 1079b69a54eeSKentaro Takeda const char *name = tomoyo_get_file_pattern(filename)->name; 1080b69a54eeSKentaro Takeda tomoyo_update_single_path_acl(operation, name, domain, false); 1081b69a54eeSKentaro Takeda } 1082b69a54eeSKentaro Takeda if (!is_enforce) 1083b69a54eeSKentaro Takeda error = 0; 1084b69a54eeSKentaro Takeda ok: 1085b69a54eeSKentaro Takeda /* 1086b69a54eeSKentaro Takeda * Since "allow_truncate" doesn't imply "allow_rewrite" permission, 1087b69a54eeSKentaro Takeda * we need to check "allow_rewrite" permission if the filename is 1088b69a54eeSKentaro Takeda * specified by "deny_rewrite" keyword. 1089b69a54eeSKentaro Takeda */ 1090b69a54eeSKentaro Takeda if (!error && operation == TOMOYO_TYPE_TRUNCATE_ACL && 1091b69a54eeSKentaro Takeda tomoyo_is_no_rewrite_file(filename)) { 1092b69a54eeSKentaro Takeda operation = TOMOYO_TYPE_REWRITE_ACL; 1093b69a54eeSKentaro Takeda goto next; 1094b69a54eeSKentaro Takeda } 1095b69a54eeSKentaro Takeda return error; 1096b69a54eeSKentaro Takeda } 1097b69a54eeSKentaro Takeda 1098b69a54eeSKentaro Takeda /** 1099b69a54eeSKentaro Takeda * tomoyo_check_file_perm - Check permission for sysctl()'s "read" and "write". 1100b69a54eeSKentaro Takeda * 1101b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 1102b69a54eeSKentaro Takeda * @filename: Filename to check. 1103b69a54eeSKentaro Takeda * @perm: Mode ("read" or "write" or "read/write"). 1104b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 1105b69a54eeSKentaro Takeda */ 1106b69a54eeSKentaro Takeda int tomoyo_check_file_perm(struct tomoyo_domain_info *domain, 1107b69a54eeSKentaro Takeda const char *filename, const u8 perm) 1108b69a54eeSKentaro Takeda { 1109b69a54eeSKentaro Takeda struct tomoyo_path_info name; 1110b69a54eeSKentaro Takeda const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); 1111b69a54eeSKentaro Takeda 1112b69a54eeSKentaro Takeda if (!mode) 1113b69a54eeSKentaro Takeda return 0; 1114b69a54eeSKentaro Takeda name.name = filename; 1115b69a54eeSKentaro Takeda tomoyo_fill_path_info(&name); 1116b69a54eeSKentaro Takeda return tomoyo_check_file_perm2(domain, &name, perm, "sysctl", mode); 1117b69a54eeSKentaro Takeda } 1118b69a54eeSKentaro Takeda 1119b69a54eeSKentaro Takeda /** 1120b69a54eeSKentaro Takeda * tomoyo_check_exec_perm - Check permission for "execute". 1121b69a54eeSKentaro Takeda * 1122b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 1123b69a54eeSKentaro Takeda * @filename: Check permission for "execute". 1124b69a54eeSKentaro Takeda * 1125b69a54eeSKentaro Takeda * Returns 0 on success, negativevalue otherwise. 1126b69a54eeSKentaro Takeda */ 1127b69a54eeSKentaro Takeda int tomoyo_check_exec_perm(struct tomoyo_domain_info *domain, 1128bcb86975STetsuo Handa const struct tomoyo_path_info *filename) 1129b69a54eeSKentaro Takeda { 1130b69a54eeSKentaro Takeda const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); 1131b69a54eeSKentaro Takeda 1132b69a54eeSKentaro Takeda if (!mode) 1133b69a54eeSKentaro Takeda return 0; 1134b69a54eeSKentaro Takeda return tomoyo_check_file_perm2(domain, filename, 1, "do_execve", mode); 1135b69a54eeSKentaro Takeda } 1136b69a54eeSKentaro Takeda 1137b69a54eeSKentaro Takeda /** 1138b69a54eeSKentaro Takeda * tomoyo_check_open_permission - Check permission for "read" and "write". 1139b69a54eeSKentaro Takeda * 1140b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 1141b69a54eeSKentaro Takeda * @path: Pointer to "struct path". 1142b69a54eeSKentaro Takeda * @flag: Flags for open(). 1143b69a54eeSKentaro Takeda * 1144b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 1145b69a54eeSKentaro Takeda */ 1146b69a54eeSKentaro Takeda int tomoyo_check_open_permission(struct tomoyo_domain_info *domain, 1147b69a54eeSKentaro Takeda struct path *path, const int flag) 1148b69a54eeSKentaro Takeda { 1149b69a54eeSKentaro Takeda const u8 acc_mode = ACC_MODE(flag); 1150b69a54eeSKentaro Takeda int error = -ENOMEM; 1151b69a54eeSKentaro Takeda struct tomoyo_path_info *buf; 1152b69a54eeSKentaro Takeda const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); 1153b69a54eeSKentaro Takeda const bool is_enforce = (mode == 3); 1154b69a54eeSKentaro Takeda 1155b69a54eeSKentaro Takeda if (!mode || !path->mnt) 1156b69a54eeSKentaro Takeda return 0; 1157b69a54eeSKentaro Takeda if (acc_mode == 0) 1158b69a54eeSKentaro Takeda return 0; 1159b69a54eeSKentaro Takeda if (path->dentry->d_inode && S_ISDIR(path->dentry->d_inode->i_mode)) 1160b69a54eeSKentaro Takeda /* 1161b69a54eeSKentaro Takeda * I don't check directories here because mkdir() and rmdir() 1162b69a54eeSKentaro Takeda * don't call me. 1163b69a54eeSKentaro Takeda */ 1164b69a54eeSKentaro Takeda return 0; 1165b69a54eeSKentaro Takeda buf = tomoyo_get_path(path); 1166b69a54eeSKentaro Takeda if (!buf) 1167b69a54eeSKentaro Takeda goto out; 1168b69a54eeSKentaro Takeda error = 0; 1169b69a54eeSKentaro Takeda /* 1170b69a54eeSKentaro Takeda * If the filename is specified by "deny_rewrite" keyword, 1171b69a54eeSKentaro Takeda * we need to check "allow_rewrite" permission when the filename is not 1172b69a54eeSKentaro Takeda * opened for append mode or the filename is truncated at open time. 1173b69a54eeSKentaro Takeda */ 1174b69a54eeSKentaro Takeda if ((acc_mode & MAY_WRITE) && 1175b69a54eeSKentaro Takeda ((flag & O_TRUNC) || !(flag & O_APPEND)) && 1176b69a54eeSKentaro Takeda (tomoyo_is_no_rewrite_file(buf))) { 1177b69a54eeSKentaro Takeda error = tomoyo_check_single_path_permission2(domain, 1178b69a54eeSKentaro Takeda TOMOYO_TYPE_REWRITE_ACL, 1179b69a54eeSKentaro Takeda buf, mode); 1180b69a54eeSKentaro Takeda } 1181b69a54eeSKentaro Takeda if (!error) 1182b69a54eeSKentaro Takeda error = tomoyo_check_file_perm2(domain, buf, acc_mode, "open", 1183b69a54eeSKentaro Takeda mode); 1184b69a54eeSKentaro Takeda if (!error && (flag & O_TRUNC)) 1185b69a54eeSKentaro Takeda error = tomoyo_check_single_path_permission2(domain, 1186b69a54eeSKentaro Takeda TOMOYO_TYPE_TRUNCATE_ACL, 1187b69a54eeSKentaro Takeda buf, mode); 1188b69a54eeSKentaro Takeda out: 1189b69a54eeSKentaro Takeda tomoyo_free(buf); 1190b69a54eeSKentaro Takeda if (!is_enforce) 1191b69a54eeSKentaro Takeda error = 0; 1192b69a54eeSKentaro Takeda return error; 1193b69a54eeSKentaro Takeda } 1194b69a54eeSKentaro Takeda 1195b69a54eeSKentaro Takeda /** 1196b69a54eeSKentaro Takeda * tomoyo_check_1path_perm - Check permission for "create", "unlink", "mkdir", "rmdir", "mkfifo", "mksock", "mkblock", "mkchar", "truncate" and "symlink". 1197b69a54eeSKentaro Takeda * 1198b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 1199b69a54eeSKentaro Takeda * @operation: Type of operation. 1200b69a54eeSKentaro Takeda * @path: Pointer to "struct path". 1201b69a54eeSKentaro Takeda * 1202b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 1203b69a54eeSKentaro Takeda */ 1204b69a54eeSKentaro Takeda int tomoyo_check_1path_perm(struct tomoyo_domain_info *domain, 1205b69a54eeSKentaro Takeda const u8 operation, struct path *path) 1206b69a54eeSKentaro Takeda { 1207b69a54eeSKentaro Takeda int error = -ENOMEM; 1208b69a54eeSKentaro Takeda struct tomoyo_path_info *buf; 1209b69a54eeSKentaro Takeda const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); 1210b69a54eeSKentaro Takeda const bool is_enforce = (mode == 3); 1211b69a54eeSKentaro Takeda 1212b69a54eeSKentaro Takeda if (!mode || !path->mnt) 1213b69a54eeSKentaro Takeda return 0; 1214b69a54eeSKentaro Takeda buf = tomoyo_get_path(path); 1215b69a54eeSKentaro Takeda if (!buf) 1216b69a54eeSKentaro Takeda goto out; 1217b69a54eeSKentaro Takeda switch (operation) { 1218b69a54eeSKentaro Takeda case TOMOYO_TYPE_MKDIR_ACL: 1219b69a54eeSKentaro Takeda case TOMOYO_TYPE_RMDIR_ACL: 1220b69a54eeSKentaro Takeda if (!buf->is_dir) { 1221b69a54eeSKentaro Takeda /* 1222b69a54eeSKentaro Takeda * tomoyo_get_path() reserves space for appending "/." 1223b69a54eeSKentaro Takeda */ 1224b69a54eeSKentaro Takeda strcat((char *) buf->name, "/"); 1225b69a54eeSKentaro Takeda tomoyo_fill_path_info(buf); 1226b69a54eeSKentaro Takeda } 1227b69a54eeSKentaro Takeda } 1228b69a54eeSKentaro Takeda error = tomoyo_check_single_path_permission2(domain, operation, buf, 1229b69a54eeSKentaro Takeda mode); 1230b69a54eeSKentaro Takeda out: 1231b69a54eeSKentaro Takeda tomoyo_free(buf); 1232b69a54eeSKentaro Takeda if (!is_enforce) 1233b69a54eeSKentaro Takeda error = 0; 1234b69a54eeSKentaro Takeda return error; 1235b69a54eeSKentaro Takeda } 1236b69a54eeSKentaro Takeda 1237b69a54eeSKentaro Takeda /** 1238b69a54eeSKentaro Takeda * tomoyo_check_rewrite_permission - Check permission for "rewrite". 1239b69a54eeSKentaro Takeda * 1240b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 1241b69a54eeSKentaro Takeda * @filp: Pointer to "struct file". 1242b69a54eeSKentaro Takeda * 1243b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 1244b69a54eeSKentaro Takeda */ 1245b69a54eeSKentaro Takeda int tomoyo_check_rewrite_permission(struct tomoyo_domain_info *domain, 1246b69a54eeSKentaro Takeda struct file *filp) 1247b69a54eeSKentaro Takeda { 1248b69a54eeSKentaro Takeda int error = -ENOMEM; 1249b69a54eeSKentaro Takeda const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); 1250b69a54eeSKentaro Takeda const bool is_enforce = (mode == 3); 1251b69a54eeSKentaro Takeda struct tomoyo_path_info *buf; 1252b69a54eeSKentaro Takeda 1253b69a54eeSKentaro Takeda if (!mode || !filp->f_path.mnt) 1254b69a54eeSKentaro Takeda return 0; 1255b69a54eeSKentaro Takeda buf = tomoyo_get_path(&filp->f_path); 1256b69a54eeSKentaro Takeda if (!buf) 1257b69a54eeSKentaro Takeda goto out; 1258b69a54eeSKentaro Takeda if (!tomoyo_is_no_rewrite_file(buf)) { 1259b69a54eeSKentaro Takeda error = 0; 1260b69a54eeSKentaro Takeda goto out; 1261b69a54eeSKentaro Takeda } 1262b69a54eeSKentaro Takeda error = tomoyo_check_single_path_permission2(domain, 1263b69a54eeSKentaro Takeda TOMOYO_TYPE_REWRITE_ACL, 1264b69a54eeSKentaro Takeda buf, mode); 1265b69a54eeSKentaro Takeda out: 1266b69a54eeSKentaro Takeda tomoyo_free(buf); 1267b69a54eeSKentaro Takeda if (!is_enforce) 1268b69a54eeSKentaro Takeda error = 0; 1269b69a54eeSKentaro Takeda return error; 1270b69a54eeSKentaro Takeda } 1271b69a54eeSKentaro Takeda 1272b69a54eeSKentaro Takeda /** 1273b69a54eeSKentaro Takeda * tomoyo_check_2path_perm - Check permission for "rename" and "link". 1274b69a54eeSKentaro Takeda * 1275b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 1276b69a54eeSKentaro Takeda * @operation: Type of operation. 1277b69a54eeSKentaro Takeda * @path1: Pointer to "struct path". 1278b69a54eeSKentaro Takeda * @path2: Pointer to "struct path". 1279b69a54eeSKentaro Takeda * 1280b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 1281b69a54eeSKentaro Takeda */ 1282b69a54eeSKentaro Takeda int tomoyo_check_2path_perm(struct tomoyo_domain_info * const domain, 1283b69a54eeSKentaro Takeda const u8 operation, struct path *path1, 1284b69a54eeSKentaro Takeda struct path *path2) 1285b69a54eeSKentaro Takeda { 1286b69a54eeSKentaro Takeda int error = -ENOMEM; 1287b69a54eeSKentaro Takeda struct tomoyo_path_info *buf1, *buf2; 1288b69a54eeSKentaro Takeda const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); 1289b69a54eeSKentaro Takeda const bool is_enforce = (mode == 3); 1290b69a54eeSKentaro Takeda const char *msg; 1291b69a54eeSKentaro Takeda 1292b69a54eeSKentaro Takeda if (!mode || !path1->mnt || !path2->mnt) 1293b69a54eeSKentaro Takeda return 0; 1294b69a54eeSKentaro Takeda buf1 = tomoyo_get_path(path1); 1295b69a54eeSKentaro Takeda buf2 = tomoyo_get_path(path2); 1296b69a54eeSKentaro Takeda if (!buf1 || !buf2) 1297b69a54eeSKentaro Takeda goto out; 1298b69a54eeSKentaro Takeda { 1299b69a54eeSKentaro Takeda struct dentry *dentry = path1->dentry; 1300b69a54eeSKentaro Takeda if (dentry->d_inode && S_ISDIR(dentry->d_inode->i_mode)) { 1301b69a54eeSKentaro Takeda /* 1302b69a54eeSKentaro Takeda * tomoyo_get_path() reserves space for appending "/." 1303b69a54eeSKentaro Takeda */ 1304b69a54eeSKentaro Takeda if (!buf1->is_dir) { 1305b69a54eeSKentaro Takeda strcat((char *) buf1->name, "/"); 1306b69a54eeSKentaro Takeda tomoyo_fill_path_info(buf1); 1307b69a54eeSKentaro Takeda } 1308b69a54eeSKentaro Takeda if (!buf2->is_dir) { 1309b69a54eeSKentaro Takeda strcat((char *) buf2->name, "/"); 1310b69a54eeSKentaro Takeda tomoyo_fill_path_info(buf2); 1311b69a54eeSKentaro Takeda } 1312b69a54eeSKentaro Takeda } 1313b69a54eeSKentaro Takeda } 1314b69a54eeSKentaro Takeda error = tomoyo_check_double_path_acl(domain, operation, buf1, buf2); 1315b69a54eeSKentaro Takeda msg = tomoyo_dp2keyword(operation); 1316b69a54eeSKentaro Takeda if (!error) 1317b69a54eeSKentaro Takeda goto out; 1318b69a54eeSKentaro Takeda if (tomoyo_verbose_mode(domain)) 1319b69a54eeSKentaro Takeda printk(KERN_WARNING "TOMOYO-%s: Access '%s %s %s' " 1320b69a54eeSKentaro Takeda "denied for %s\n", tomoyo_get_msg(is_enforce), 1321b69a54eeSKentaro Takeda msg, buf1->name, buf2->name, 1322b69a54eeSKentaro Takeda tomoyo_get_last_name(domain)); 1323b69a54eeSKentaro Takeda if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) { 1324b69a54eeSKentaro Takeda const char *name1 = tomoyo_get_file_pattern(buf1)->name; 1325b69a54eeSKentaro Takeda const char *name2 = tomoyo_get_file_pattern(buf2)->name; 1326b69a54eeSKentaro Takeda tomoyo_update_double_path_acl(operation, name1, name2, domain, 1327b69a54eeSKentaro Takeda false); 1328b69a54eeSKentaro Takeda } 1329b69a54eeSKentaro Takeda out: 1330b69a54eeSKentaro Takeda tomoyo_free(buf1); 1331b69a54eeSKentaro Takeda tomoyo_free(buf2); 1332b69a54eeSKentaro Takeda if (!is_enforce) 1333b69a54eeSKentaro Takeda error = 0; 1334b69a54eeSKentaro Takeda return error; 1335b69a54eeSKentaro Takeda } 1336