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 14b69a54eeSKentaro Takeda /* Keyword array for single path operations. */ 157ef61233STetsuo Handa static const char *tomoyo_path_keyword[TOMOYO_MAX_PATH_OPERATION] = { 167ef61233STetsuo Handa [TOMOYO_TYPE_READ_WRITE] = "read/write", 177ef61233STetsuo Handa [TOMOYO_TYPE_EXECUTE] = "execute", 187ef61233STetsuo Handa [TOMOYO_TYPE_READ] = "read", 197ef61233STetsuo Handa [TOMOYO_TYPE_WRITE] = "write", 207ef61233STetsuo Handa [TOMOYO_TYPE_CREATE] = "create", 217ef61233STetsuo Handa [TOMOYO_TYPE_UNLINK] = "unlink", 227ef61233STetsuo Handa [TOMOYO_TYPE_MKDIR] = "mkdir", 237ef61233STetsuo Handa [TOMOYO_TYPE_RMDIR] = "rmdir", 247ef61233STetsuo Handa [TOMOYO_TYPE_MKFIFO] = "mkfifo", 257ef61233STetsuo Handa [TOMOYO_TYPE_MKSOCK] = "mksock", 267ef61233STetsuo Handa [TOMOYO_TYPE_MKBLOCK] = "mkblock", 277ef61233STetsuo Handa [TOMOYO_TYPE_MKCHAR] = "mkchar", 287ef61233STetsuo Handa [TOMOYO_TYPE_TRUNCATE] = "truncate", 297ef61233STetsuo Handa [TOMOYO_TYPE_SYMLINK] = "symlink", 307ef61233STetsuo Handa [TOMOYO_TYPE_REWRITE] = "rewrite", 317ef61233STetsuo Handa [TOMOYO_TYPE_IOCTL] = "ioctl", 327ef61233STetsuo Handa [TOMOYO_TYPE_CHMOD] = "chmod", 337ef61233STetsuo Handa [TOMOYO_TYPE_CHOWN] = "chown", 347ef61233STetsuo Handa [TOMOYO_TYPE_CHGRP] = "chgrp", 357ef61233STetsuo Handa [TOMOYO_TYPE_CHROOT] = "chroot", 367ef61233STetsuo Handa [TOMOYO_TYPE_MOUNT] = "mount", 377ef61233STetsuo Handa [TOMOYO_TYPE_UMOUNT] = "unmount", 38b69a54eeSKentaro Takeda }; 39b69a54eeSKentaro Takeda 40b69a54eeSKentaro Takeda /* Keyword array for double path operations. */ 417ef61233STetsuo Handa static const char *tomoyo_path2_keyword[TOMOYO_MAX_PATH2_OPERATION] = { 427ef61233STetsuo Handa [TOMOYO_TYPE_LINK] = "link", 437ef61233STetsuo Handa [TOMOYO_TYPE_RENAME] = "rename", 447ef61233STetsuo Handa [TOMOYO_TYPE_PIVOT_ROOT] = "pivot_root", 45b69a54eeSKentaro Takeda }; 46b69a54eeSKentaro Takeda 47b69a54eeSKentaro Takeda /** 487ef61233STetsuo Handa * tomoyo_path2keyword - Get the name of single path operation. 49b69a54eeSKentaro Takeda * 50b69a54eeSKentaro Takeda * @operation: Type of operation. 51b69a54eeSKentaro Takeda * 52b69a54eeSKentaro Takeda * Returns the name of single path operation. 53b69a54eeSKentaro Takeda */ 547ef61233STetsuo Handa const char *tomoyo_path2keyword(const u8 operation) 55b69a54eeSKentaro Takeda { 567ef61233STetsuo Handa return (operation < TOMOYO_MAX_PATH_OPERATION) 577ef61233STetsuo Handa ? tomoyo_path_keyword[operation] : NULL; 58b69a54eeSKentaro Takeda } 59b69a54eeSKentaro Takeda 60b69a54eeSKentaro Takeda /** 617ef61233STetsuo Handa * tomoyo_path22keyword - Get the name of double path operation. 62b69a54eeSKentaro Takeda * 63b69a54eeSKentaro Takeda * @operation: Type of operation. 64b69a54eeSKentaro Takeda * 65b69a54eeSKentaro Takeda * Returns the name of double path operation. 66b69a54eeSKentaro Takeda */ 677ef61233STetsuo Handa const char *tomoyo_path22keyword(const u8 operation) 68b69a54eeSKentaro Takeda { 697ef61233STetsuo Handa return (operation < TOMOYO_MAX_PATH2_OPERATION) 707ef61233STetsuo Handa ? tomoyo_path2_keyword[operation] : NULL; 71b69a54eeSKentaro Takeda } 72b69a54eeSKentaro Takeda 73b69a54eeSKentaro Takeda /** 74b69a54eeSKentaro Takeda * tomoyo_strendswith - Check whether the token ends with the given token. 75b69a54eeSKentaro Takeda * 76b69a54eeSKentaro Takeda * @name: The token to check. 77b69a54eeSKentaro Takeda * @tail: The token to find. 78b69a54eeSKentaro Takeda * 79b69a54eeSKentaro Takeda * Returns true if @name ends with @tail, false otherwise. 80b69a54eeSKentaro Takeda */ 81b69a54eeSKentaro Takeda static bool tomoyo_strendswith(const char *name, const char *tail) 82b69a54eeSKentaro Takeda { 83b69a54eeSKentaro Takeda int len; 84b69a54eeSKentaro Takeda 85b69a54eeSKentaro Takeda if (!name || !tail) 86b69a54eeSKentaro Takeda return false; 87b69a54eeSKentaro Takeda len = strlen(name) - strlen(tail); 88b69a54eeSKentaro Takeda return len >= 0 && !strcmp(name + len, tail); 89b69a54eeSKentaro Takeda } 90b69a54eeSKentaro Takeda 91b69a54eeSKentaro Takeda /** 92b69a54eeSKentaro Takeda * tomoyo_get_path - Get realpath. 93b69a54eeSKentaro Takeda * 94b69a54eeSKentaro Takeda * @path: Pointer to "struct path". 95b69a54eeSKentaro Takeda * 96b69a54eeSKentaro Takeda * Returns pointer to "struct tomoyo_path_info" on success, NULL otherwise. 97b69a54eeSKentaro Takeda */ 98b69a54eeSKentaro Takeda static struct tomoyo_path_info *tomoyo_get_path(struct path *path) 99b69a54eeSKentaro Takeda { 100b69a54eeSKentaro Takeda int error; 1018e2d39a1STetsuo Handa struct tomoyo_path_info_with_data *buf = kzalloc(sizeof(*buf), 1024e5d6f7eSTetsuo Handa GFP_NOFS); 103b69a54eeSKentaro Takeda 104b69a54eeSKentaro Takeda if (!buf) 105b69a54eeSKentaro Takeda return NULL; 106b69a54eeSKentaro Takeda /* Reserve one byte for appending "/". */ 107b69a54eeSKentaro Takeda error = tomoyo_realpath_from_path2(path, buf->body, 108b69a54eeSKentaro Takeda sizeof(buf->body) - 2); 109b69a54eeSKentaro Takeda if (!error) { 110b69a54eeSKentaro Takeda buf->head.name = buf->body; 111b69a54eeSKentaro Takeda tomoyo_fill_path_info(&buf->head); 112b69a54eeSKentaro Takeda return &buf->head; 113b69a54eeSKentaro Takeda } 1148e2d39a1STetsuo Handa kfree(buf); 115b69a54eeSKentaro Takeda return NULL; 116b69a54eeSKentaro Takeda } 117b69a54eeSKentaro Takeda 1187ef61233STetsuo Handa static int tomoyo_update_path2_acl(const u8 type, const char *filename1, 119b69a54eeSKentaro Takeda const char *filename2, 1207ef61233STetsuo Handa struct tomoyo_domain_info *const domain, 1217ef61233STetsuo Handa const bool is_delete); 1227ef61233STetsuo Handa static int tomoyo_update_path_acl(const u8 type, const char *filename, 1237ef61233STetsuo Handa struct tomoyo_domain_info *const domain, 1247ef61233STetsuo Handa const bool is_delete); 125b69a54eeSKentaro Takeda 126c3fa109aSTetsuo Handa /* 127c3fa109aSTetsuo Handa * tomoyo_globally_readable_list is used for holding list of pathnames which 128c3fa109aSTetsuo Handa * are by default allowed to be open()ed for reading by any process. 129c3fa109aSTetsuo Handa * 130c3fa109aSTetsuo Handa * An entry is added by 131c3fa109aSTetsuo Handa * 132c3fa109aSTetsuo Handa * # echo 'allow_read /lib/libc-2.5.so' > \ 133c3fa109aSTetsuo Handa * /sys/kernel/security/tomoyo/exception_policy 134c3fa109aSTetsuo Handa * 135c3fa109aSTetsuo Handa * and is deleted by 136c3fa109aSTetsuo Handa * 137c3fa109aSTetsuo Handa * # echo 'delete allow_read /lib/libc-2.5.so' > \ 138c3fa109aSTetsuo Handa * /sys/kernel/security/tomoyo/exception_policy 139c3fa109aSTetsuo Handa * 140c3fa109aSTetsuo Handa * and all entries are retrieved by 141c3fa109aSTetsuo Handa * 142c3fa109aSTetsuo Handa * # grep ^allow_read /sys/kernel/security/tomoyo/exception_policy 143c3fa109aSTetsuo Handa * 144c3fa109aSTetsuo Handa * In the example above, any process is allowed to 145c3fa109aSTetsuo Handa * open("/lib/libc-2.5.so", O_RDONLY). 146c3fa109aSTetsuo Handa * One exception is, if the domain which current process belongs to is marked 147c3fa109aSTetsuo Handa * as "ignore_global_allow_read", current process can't do so unless explicitly 148c3fa109aSTetsuo Handa * given "allow_read /lib/libc-2.5.so" to the domain which current process 149c3fa109aSTetsuo Handa * belongs to. 150c3fa109aSTetsuo Handa */ 151847b173eSTetsuo Handa LIST_HEAD(tomoyo_globally_readable_list); 152b69a54eeSKentaro Takeda 153b69a54eeSKentaro Takeda /** 154b69a54eeSKentaro Takeda * tomoyo_update_globally_readable_entry - Update "struct tomoyo_globally_readable_file_entry" list. 155b69a54eeSKentaro Takeda * 156b69a54eeSKentaro Takeda * @filename: Filename unconditionally permitted to open() for reading. 157b69a54eeSKentaro Takeda * @is_delete: True if it is a delete request. 158b69a54eeSKentaro Takeda * 159b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 160fdb8ebb7STetsuo Handa * 161fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 162b69a54eeSKentaro Takeda */ 163b69a54eeSKentaro Takeda static int tomoyo_update_globally_readable_entry(const char *filename, 164b69a54eeSKentaro Takeda const bool is_delete) 165b69a54eeSKentaro Takeda { 166ca0b7df3STetsuo Handa struct tomoyo_globally_readable_file_entry *entry = NULL; 167b69a54eeSKentaro Takeda struct tomoyo_globally_readable_file_entry *ptr; 168b69a54eeSKentaro Takeda const struct tomoyo_path_info *saved_filename; 169ca0b7df3STetsuo Handa int error = is_delete ? -ENOENT : -ENOMEM; 170b69a54eeSKentaro Takeda 17117080008STetsuo Handa if (!tomoyo_is_correct_path(filename, 1, 0, -1)) 172b69a54eeSKentaro Takeda return -EINVAL; 173bf24fb01STetsuo Handa saved_filename = tomoyo_get_name(filename); 174b69a54eeSKentaro Takeda if (!saved_filename) 175b69a54eeSKentaro Takeda return -ENOMEM; 176ca0b7df3STetsuo Handa if (!is_delete) 1774e5d6f7eSTetsuo Handa entry = kmalloc(sizeof(*entry), GFP_NOFS); 178f737d95dSTetsuo Handa mutex_lock(&tomoyo_policy_lock); 179fdb8ebb7STetsuo Handa list_for_each_entry_rcu(ptr, &tomoyo_globally_readable_list, list) { 180b69a54eeSKentaro Takeda if (ptr->filename != saved_filename) 181b69a54eeSKentaro Takeda continue; 182b69a54eeSKentaro Takeda ptr->is_deleted = is_delete; 183b69a54eeSKentaro Takeda error = 0; 184ca0b7df3STetsuo Handa break; 185b69a54eeSKentaro Takeda } 186ca0b7df3STetsuo Handa if (!is_delete && error && tomoyo_memory_ok(entry)) { 187ca0b7df3STetsuo Handa entry->filename = saved_filename; 188bf24fb01STetsuo Handa saved_filename = NULL; 189ca0b7df3STetsuo Handa list_add_tail_rcu(&entry->list, &tomoyo_globally_readable_list); 190ca0b7df3STetsuo Handa entry = NULL; 191b69a54eeSKentaro Takeda error = 0; 192ca0b7df3STetsuo Handa } 193f737d95dSTetsuo Handa mutex_unlock(&tomoyo_policy_lock); 194bf24fb01STetsuo Handa tomoyo_put_name(saved_filename); 195ca0b7df3STetsuo Handa kfree(entry); 196b69a54eeSKentaro Takeda return error; 197b69a54eeSKentaro Takeda } 198b69a54eeSKentaro Takeda 199b69a54eeSKentaro Takeda /** 200b69a54eeSKentaro Takeda * tomoyo_is_globally_readable_file - Check if the file is unconditionnaly permitted to be open()ed for reading. 201b69a54eeSKentaro Takeda * 202b69a54eeSKentaro Takeda * @filename: The filename to check. 203b69a54eeSKentaro Takeda * 204b69a54eeSKentaro Takeda * Returns true if any domain can open @filename for reading, false otherwise. 205fdb8ebb7STetsuo Handa * 206fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 207b69a54eeSKentaro Takeda */ 208b69a54eeSKentaro Takeda static bool tomoyo_is_globally_readable_file(const struct tomoyo_path_info * 209b69a54eeSKentaro Takeda filename) 210b69a54eeSKentaro Takeda { 211b69a54eeSKentaro Takeda struct tomoyo_globally_readable_file_entry *ptr; 212b69a54eeSKentaro Takeda bool found = false; 213fdb8ebb7STetsuo Handa 214fdb8ebb7STetsuo Handa list_for_each_entry_rcu(ptr, &tomoyo_globally_readable_list, list) { 215b69a54eeSKentaro Takeda if (!ptr->is_deleted && 216b69a54eeSKentaro Takeda tomoyo_path_matches_pattern(filename, ptr->filename)) { 217b69a54eeSKentaro Takeda found = true; 218b69a54eeSKentaro Takeda break; 219b69a54eeSKentaro Takeda } 220b69a54eeSKentaro Takeda } 221b69a54eeSKentaro Takeda return found; 222b69a54eeSKentaro Takeda } 223b69a54eeSKentaro Takeda 224b69a54eeSKentaro Takeda /** 225b69a54eeSKentaro Takeda * tomoyo_write_globally_readable_policy - Write "struct tomoyo_globally_readable_file_entry" list. 226b69a54eeSKentaro Takeda * 227b69a54eeSKentaro Takeda * @data: String to parse. 228b69a54eeSKentaro Takeda * @is_delete: True if it is a delete request. 229b69a54eeSKentaro Takeda * 230b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 231fdb8ebb7STetsuo Handa * 232fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 233b69a54eeSKentaro Takeda */ 234b69a54eeSKentaro Takeda int tomoyo_write_globally_readable_policy(char *data, const bool is_delete) 235b69a54eeSKentaro Takeda { 236b69a54eeSKentaro Takeda return tomoyo_update_globally_readable_entry(data, is_delete); 237b69a54eeSKentaro Takeda } 238b69a54eeSKentaro Takeda 239b69a54eeSKentaro Takeda /** 240b69a54eeSKentaro Takeda * tomoyo_read_globally_readable_policy - Read "struct tomoyo_globally_readable_file_entry" list. 241b69a54eeSKentaro Takeda * 242b69a54eeSKentaro Takeda * @head: Pointer to "struct tomoyo_io_buffer". 243b69a54eeSKentaro Takeda * 244b69a54eeSKentaro Takeda * Returns true on success, false otherwise. 245fdb8ebb7STetsuo Handa * 246fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 247b69a54eeSKentaro Takeda */ 248b69a54eeSKentaro Takeda bool tomoyo_read_globally_readable_policy(struct tomoyo_io_buffer *head) 249b69a54eeSKentaro Takeda { 250b69a54eeSKentaro Takeda struct list_head *pos; 251b69a54eeSKentaro Takeda bool done = true; 252b69a54eeSKentaro Takeda 253b69a54eeSKentaro Takeda list_for_each_cookie(pos, head->read_var2, 254b69a54eeSKentaro Takeda &tomoyo_globally_readable_list) { 255b69a54eeSKentaro Takeda struct tomoyo_globally_readable_file_entry *ptr; 256b69a54eeSKentaro Takeda ptr = list_entry(pos, 257b69a54eeSKentaro Takeda struct tomoyo_globally_readable_file_entry, 258b69a54eeSKentaro Takeda list); 259b69a54eeSKentaro Takeda if (ptr->is_deleted) 260b69a54eeSKentaro Takeda continue; 2617d2948b1STetsuo Handa done = tomoyo_io_printf(head, TOMOYO_KEYWORD_ALLOW_READ "%s\n", 2627d2948b1STetsuo Handa ptr->filename->name); 2637d2948b1STetsuo Handa if (!done) 264b69a54eeSKentaro Takeda break; 265b69a54eeSKentaro Takeda } 266b69a54eeSKentaro Takeda return done; 267b69a54eeSKentaro Takeda } 268b69a54eeSKentaro Takeda 269c3fa109aSTetsuo Handa /* tomoyo_pattern_list is used for holding list of pathnames which are used for 270c3fa109aSTetsuo Handa * converting pathnames to pathname patterns during learning mode. 271c3fa109aSTetsuo Handa * 272c3fa109aSTetsuo Handa * An entry is added by 273c3fa109aSTetsuo Handa * 274c3fa109aSTetsuo Handa * # echo 'file_pattern /proc/\$/mounts' > \ 275c3fa109aSTetsuo Handa * /sys/kernel/security/tomoyo/exception_policy 276c3fa109aSTetsuo Handa * 277c3fa109aSTetsuo Handa * and is deleted by 278c3fa109aSTetsuo Handa * 279c3fa109aSTetsuo Handa * # echo 'delete file_pattern /proc/\$/mounts' > \ 280c3fa109aSTetsuo Handa * /sys/kernel/security/tomoyo/exception_policy 281c3fa109aSTetsuo Handa * 282c3fa109aSTetsuo Handa * and all entries are retrieved by 283c3fa109aSTetsuo Handa * 284c3fa109aSTetsuo Handa * # grep ^file_pattern /sys/kernel/security/tomoyo/exception_policy 285c3fa109aSTetsuo Handa * 286c3fa109aSTetsuo Handa * In the example above, if a process which belongs to a domain which is in 287c3fa109aSTetsuo Handa * learning mode requested open("/proc/1/mounts", O_RDONLY), 288c3fa109aSTetsuo Handa * "allow_read /proc/\$/mounts" is automatically added to the domain which that 289c3fa109aSTetsuo Handa * process belongs to. 290c3fa109aSTetsuo Handa * 291c3fa109aSTetsuo Handa * It is not a desirable behavior that we have to use /proc/\$/ instead of 292c3fa109aSTetsuo Handa * /proc/self/ when current process needs to access only current process's 293c3fa109aSTetsuo Handa * information. As of now, LSM version of TOMOYO is using __d_path() for 294c3fa109aSTetsuo Handa * calculating pathname. Non LSM version of TOMOYO is using its own function 295c3fa109aSTetsuo Handa * which pretends as if /proc/self/ is not a symlink; so that we can forbid 296c3fa109aSTetsuo Handa * current process from accessing other process's information. 297c3fa109aSTetsuo Handa */ 298847b173eSTetsuo Handa LIST_HEAD(tomoyo_pattern_list); 299b69a54eeSKentaro Takeda 300b69a54eeSKentaro Takeda /** 301b69a54eeSKentaro Takeda * tomoyo_update_file_pattern_entry - Update "struct tomoyo_pattern_entry" list. 302b69a54eeSKentaro Takeda * 303b69a54eeSKentaro Takeda * @pattern: Pathname pattern. 304b69a54eeSKentaro Takeda * @is_delete: True if it is a delete request. 305b69a54eeSKentaro Takeda * 306b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 307fdb8ebb7STetsuo Handa * 308fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 309b69a54eeSKentaro Takeda */ 310b69a54eeSKentaro Takeda static int tomoyo_update_file_pattern_entry(const char *pattern, 311b69a54eeSKentaro Takeda const bool is_delete) 312b69a54eeSKentaro Takeda { 313ca0b7df3STetsuo Handa struct tomoyo_pattern_entry *entry = NULL; 314b69a54eeSKentaro Takeda struct tomoyo_pattern_entry *ptr; 315b69a54eeSKentaro Takeda const struct tomoyo_path_info *saved_pattern; 316ca0b7df3STetsuo Handa int error = is_delete ? -ENOENT : -ENOMEM; 317b69a54eeSKentaro Takeda 318bf24fb01STetsuo Handa saved_pattern = tomoyo_get_name(pattern); 319b69a54eeSKentaro Takeda if (!saved_pattern) 320ca0b7df3STetsuo Handa return error; 321ca0b7df3STetsuo Handa if (!saved_pattern->is_patterned) 322ca0b7df3STetsuo Handa goto out; 323ca0b7df3STetsuo Handa if (!is_delete) 3244e5d6f7eSTetsuo Handa entry = kmalloc(sizeof(*entry), GFP_NOFS); 325f737d95dSTetsuo Handa mutex_lock(&tomoyo_policy_lock); 326fdb8ebb7STetsuo Handa list_for_each_entry_rcu(ptr, &tomoyo_pattern_list, list) { 327b69a54eeSKentaro Takeda if (saved_pattern != ptr->pattern) 328b69a54eeSKentaro Takeda continue; 329b69a54eeSKentaro Takeda ptr->is_deleted = is_delete; 330b69a54eeSKentaro Takeda error = 0; 331ca0b7df3STetsuo Handa break; 332b69a54eeSKentaro Takeda } 333ca0b7df3STetsuo Handa if (!is_delete && error && tomoyo_memory_ok(entry)) { 334ca0b7df3STetsuo Handa entry->pattern = saved_pattern; 335bf24fb01STetsuo Handa saved_pattern = NULL; 336ca0b7df3STetsuo Handa list_add_tail_rcu(&entry->list, &tomoyo_pattern_list); 337ca0b7df3STetsuo Handa entry = NULL; 338b69a54eeSKentaro Takeda error = 0; 339ca0b7df3STetsuo Handa } 340f737d95dSTetsuo Handa mutex_unlock(&tomoyo_policy_lock); 341ca0b7df3STetsuo Handa out: 342ca0b7df3STetsuo Handa kfree(entry); 343bf24fb01STetsuo Handa tomoyo_put_name(saved_pattern); 344b69a54eeSKentaro Takeda return error; 345b69a54eeSKentaro Takeda } 346b69a54eeSKentaro Takeda 347b69a54eeSKentaro Takeda /** 348b69a54eeSKentaro Takeda * tomoyo_get_file_pattern - Get patterned pathname. 349b69a54eeSKentaro Takeda * 350b69a54eeSKentaro Takeda * @filename: The filename to find patterned pathname. 351b69a54eeSKentaro Takeda * 352b69a54eeSKentaro Takeda * Returns pointer to pathname pattern if matched, @filename otherwise. 353fdb8ebb7STetsuo Handa * 354fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 355b69a54eeSKentaro Takeda */ 356b69a54eeSKentaro Takeda static const struct tomoyo_path_info * 357b69a54eeSKentaro Takeda tomoyo_get_file_pattern(const struct tomoyo_path_info *filename) 358b69a54eeSKentaro Takeda { 359b69a54eeSKentaro Takeda struct tomoyo_pattern_entry *ptr; 360b69a54eeSKentaro Takeda const struct tomoyo_path_info *pattern = NULL; 361b69a54eeSKentaro Takeda 362fdb8ebb7STetsuo Handa list_for_each_entry_rcu(ptr, &tomoyo_pattern_list, list) { 363b69a54eeSKentaro Takeda if (ptr->is_deleted) 364b69a54eeSKentaro Takeda continue; 365b69a54eeSKentaro Takeda if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) 366b69a54eeSKentaro Takeda continue; 367b69a54eeSKentaro Takeda pattern = ptr->pattern; 368b69a54eeSKentaro Takeda if (tomoyo_strendswith(pattern->name, "/\\*")) { 369b69a54eeSKentaro Takeda /* Do nothing. Try to find the better match. */ 370b69a54eeSKentaro Takeda } else { 371b69a54eeSKentaro Takeda /* This would be the better match. Use this. */ 372b69a54eeSKentaro Takeda break; 373b69a54eeSKentaro Takeda } 374b69a54eeSKentaro Takeda } 375b69a54eeSKentaro Takeda if (pattern) 376b69a54eeSKentaro Takeda filename = pattern; 377b69a54eeSKentaro Takeda return filename; 378b69a54eeSKentaro Takeda } 379b69a54eeSKentaro Takeda 380b69a54eeSKentaro Takeda /** 381b69a54eeSKentaro Takeda * tomoyo_write_pattern_policy - Write "struct tomoyo_pattern_entry" list. 382b69a54eeSKentaro Takeda * 383b69a54eeSKentaro Takeda * @data: String to parse. 384b69a54eeSKentaro Takeda * @is_delete: True if it is a delete request. 385b69a54eeSKentaro Takeda * 386b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 387fdb8ebb7STetsuo Handa * 388fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 389b69a54eeSKentaro Takeda */ 390b69a54eeSKentaro Takeda int tomoyo_write_pattern_policy(char *data, const bool is_delete) 391b69a54eeSKentaro Takeda { 392b69a54eeSKentaro Takeda return tomoyo_update_file_pattern_entry(data, is_delete); 393b69a54eeSKentaro Takeda } 394b69a54eeSKentaro Takeda 395b69a54eeSKentaro Takeda /** 396b69a54eeSKentaro Takeda * tomoyo_read_file_pattern - Read "struct tomoyo_pattern_entry" list. 397b69a54eeSKentaro Takeda * 398b69a54eeSKentaro Takeda * @head: Pointer to "struct tomoyo_io_buffer". 399b69a54eeSKentaro Takeda * 400b69a54eeSKentaro Takeda * Returns true on success, false otherwise. 401fdb8ebb7STetsuo Handa * 402fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 403b69a54eeSKentaro Takeda */ 404b69a54eeSKentaro Takeda bool tomoyo_read_file_pattern(struct tomoyo_io_buffer *head) 405b69a54eeSKentaro Takeda { 406b69a54eeSKentaro Takeda struct list_head *pos; 407b69a54eeSKentaro Takeda bool done = true; 408b69a54eeSKentaro Takeda 409b69a54eeSKentaro Takeda list_for_each_cookie(pos, head->read_var2, &tomoyo_pattern_list) { 410b69a54eeSKentaro Takeda struct tomoyo_pattern_entry *ptr; 411b69a54eeSKentaro Takeda ptr = list_entry(pos, struct tomoyo_pattern_entry, list); 412b69a54eeSKentaro Takeda if (ptr->is_deleted) 413b69a54eeSKentaro Takeda continue; 4147d2948b1STetsuo Handa done = tomoyo_io_printf(head, TOMOYO_KEYWORD_FILE_PATTERN 4157d2948b1STetsuo Handa "%s\n", ptr->pattern->name); 4167d2948b1STetsuo Handa if (!done) 417b69a54eeSKentaro Takeda break; 418b69a54eeSKentaro Takeda } 419b69a54eeSKentaro Takeda return done; 420b69a54eeSKentaro Takeda } 421b69a54eeSKentaro Takeda 422c3fa109aSTetsuo Handa /* 423c3fa109aSTetsuo Handa * tomoyo_no_rewrite_list is used for holding list of pathnames which are by 424c3fa109aSTetsuo Handa * default forbidden to modify already written content of a file. 425c3fa109aSTetsuo Handa * 426c3fa109aSTetsuo Handa * An entry is added by 427c3fa109aSTetsuo Handa * 428c3fa109aSTetsuo Handa * # echo 'deny_rewrite /var/log/messages' > \ 429c3fa109aSTetsuo Handa * /sys/kernel/security/tomoyo/exception_policy 430c3fa109aSTetsuo Handa * 431c3fa109aSTetsuo Handa * and is deleted by 432c3fa109aSTetsuo Handa * 433c3fa109aSTetsuo Handa * # echo 'delete deny_rewrite /var/log/messages' > \ 434c3fa109aSTetsuo Handa * /sys/kernel/security/tomoyo/exception_policy 435c3fa109aSTetsuo Handa * 436c3fa109aSTetsuo Handa * and all entries are retrieved by 437c3fa109aSTetsuo Handa * 438c3fa109aSTetsuo Handa * # grep ^deny_rewrite /sys/kernel/security/tomoyo/exception_policy 439c3fa109aSTetsuo Handa * 440c3fa109aSTetsuo Handa * In the example above, if a process requested to rewrite /var/log/messages , 441c3fa109aSTetsuo Handa * the process can't rewrite unless the domain which that process belongs to 442c3fa109aSTetsuo Handa * has "allow_rewrite /var/log/messages" entry. 443c3fa109aSTetsuo Handa * 444c3fa109aSTetsuo Handa * It is not a desirable behavior that we have to add "\040(deleted)" suffix 445c3fa109aSTetsuo Handa * when we want to allow rewriting already unlink()ed file. As of now, 446c3fa109aSTetsuo Handa * LSM version of TOMOYO is using __d_path() for calculating pathname. 447c3fa109aSTetsuo Handa * Non LSM version of TOMOYO is using its own function which doesn't append 448c3fa109aSTetsuo Handa * " (deleted)" suffix if the file is already unlink()ed; so that we don't 449c3fa109aSTetsuo Handa * need to worry whether the file is already unlink()ed or not. 450c3fa109aSTetsuo Handa */ 451847b173eSTetsuo Handa LIST_HEAD(tomoyo_no_rewrite_list); 452b69a54eeSKentaro Takeda 453b69a54eeSKentaro Takeda /** 454b69a54eeSKentaro Takeda * tomoyo_update_no_rewrite_entry - Update "struct tomoyo_no_rewrite_entry" list. 455b69a54eeSKentaro Takeda * 456b69a54eeSKentaro Takeda * @pattern: Pathname pattern that are not rewritable by default. 457b69a54eeSKentaro Takeda * @is_delete: True if it is a delete request. 458b69a54eeSKentaro Takeda * 459b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 460fdb8ebb7STetsuo Handa * 461fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 462b69a54eeSKentaro Takeda */ 463b69a54eeSKentaro Takeda static int tomoyo_update_no_rewrite_entry(const char *pattern, 464b69a54eeSKentaro Takeda const bool is_delete) 465b69a54eeSKentaro Takeda { 466ca0b7df3STetsuo Handa struct tomoyo_no_rewrite_entry *entry = NULL; 467ca0b7df3STetsuo Handa struct tomoyo_no_rewrite_entry *ptr; 468b69a54eeSKentaro Takeda const struct tomoyo_path_info *saved_pattern; 469ca0b7df3STetsuo Handa int error = is_delete ? -ENOENT : -ENOMEM; 470b69a54eeSKentaro Takeda 47117080008STetsuo Handa if (!tomoyo_is_correct_path(pattern, 0, 0, 0)) 472b69a54eeSKentaro Takeda return -EINVAL; 473bf24fb01STetsuo Handa saved_pattern = tomoyo_get_name(pattern); 474b69a54eeSKentaro Takeda if (!saved_pattern) 475ca0b7df3STetsuo Handa return error; 476ca0b7df3STetsuo Handa if (!is_delete) 4774e5d6f7eSTetsuo Handa entry = kmalloc(sizeof(*entry), GFP_NOFS); 478f737d95dSTetsuo Handa mutex_lock(&tomoyo_policy_lock); 479fdb8ebb7STetsuo Handa list_for_each_entry_rcu(ptr, &tomoyo_no_rewrite_list, list) { 480b69a54eeSKentaro Takeda if (ptr->pattern != saved_pattern) 481b69a54eeSKentaro Takeda continue; 482b69a54eeSKentaro Takeda ptr->is_deleted = is_delete; 483b69a54eeSKentaro Takeda error = 0; 484ca0b7df3STetsuo Handa break; 485b69a54eeSKentaro Takeda } 486ca0b7df3STetsuo Handa if (!is_delete && error && tomoyo_memory_ok(entry)) { 487ca0b7df3STetsuo Handa entry->pattern = saved_pattern; 488bf24fb01STetsuo Handa saved_pattern = NULL; 489ca0b7df3STetsuo Handa list_add_tail_rcu(&entry->list, &tomoyo_no_rewrite_list); 490ca0b7df3STetsuo Handa entry = NULL; 491b69a54eeSKentaro Takeda error = 0; 492ca0b7df3STetsuo Handa } 493f737d95dSTetsuo Handa mutex_unlock(&tomoyo_policy_lock); 494bf24fb01STetsuo Handa tomoyo_put_name(saved_pattern); 495ca0b7df3STetsuo Handa kfree(entry); 496b69a54eeSKentaro Takeda return error; 497b69a54eeSKentaro Takeda } 498b69a54eeSKentaro Takeda 499b69a54eeSKentaro Takeda /** 500b69a54eeSKentaro Takeda * tomoyo_is_no_rewrite_file - Check if the given pathname is not permitted to be rewrited. 501b69a54eeSKentaro Takeda * 502b69a54eeSKentaro Takeda * @filename: Filename to check. 503b69a54eeSKentaro Takeda * 504b69a54eeSKentaro Takeda * Returns true if @filename is specified by "deny_rewrite" directive, 505b69a54eeSKentaro Takeda * false otherwise. 506fdb8ebb7STetsuo Handa * 507fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 508b69a54eeSKentaro Takeda */ 509b69a54eeSKentaro Takeda static bool tomoyo_is_no_rewrite_file(const struct tomoyo_path_info *filename) 510b69a54eeSKentaro Takeda { 511b69a54eeSKentaro Takeda struct tomoyo_no_rewrite_entry *ptr; 512b69a54eeSKentaro Takeda bool found = false; 513b69a54eeSKentaro Takeda 514fdb8ebb7STetsuo Handa list_for_each_entry_rcu(ptr, &tomoyo_no_rewrite_list, list) { 515b69a54eeSKentaro Takeda if (ptr->is_deleted) 516b69a54eeSKentaro Takeda continue; 517b69a54eeSKentaro Takeda if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) 518b69a54eeSKentaro Takeda continue; 519b69a54eeSKentaro Takeda found = true; 520b69a54eeSKentaro Takeda break; 521b69a54eeSKentaro Takeda } 522b69a54eeSKentaro Takeda return found; 523b69a54eeSKentaro Takeda } 524b69a54eeSKentaro Takeda 525b69a54eeSKentaro Takeda /** 526b69a54eeSKentaro Takeda * tomoyo_write_no_rewrite_policy - Write "struct tomoyo_no_rewrite_entry" list. 527b69a54eeSKentaro Takeda * 528b69a54eeSKentaro Takeda * @data: String to parse. 529b69a54eeSKentaro Takeda * @is_delete: True if it is a delete request. 530b69a54eeSKentaro Takeda * 531b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 532fdb8ebb7STetsuo Handa * 533fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 534b69a54eeSKentaro Takeda */ 535b69a54eeSKentaro Takeda int tomoyo_write_no_rewrite_policy(char *data, const bool is_delete) 536b69a54eeSKentaro Takeda { 537b69a54eeSKentaro Takeda return tomoyo_update_no_rewrite_entry(data, is_delete); 538b69a54eeSKentaro Takeda } 539b69a54eeSKentaro Takeda 540b69a54eeSKentaro Takeda /** 541b69a54eeSKentaro Takeda * tomoyo_read_no_rewrite_policy - Read "struct tomoyo_no_rewrite_entry" list. 542b69a54eeSKentaro Takeda * 543b69a54eeSKentaro Takeda * @head: Pointer to "struct tomoyo_io_buffer". 544b69a54eeSKentaro Takeda * 545b69a54eeSKentaro Takeda * Returns true on success, false otherwise. 546fdb8ebb7STetsuo Handa * 547fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 548b69a54eeSKentaro Takeda */ 549b69a54eeSKentaro Takeda bool tomoyo_read_no_rewrite_policy(struct tomoyo_io_buffer *head) 550b69a54eeSKentaro Takeda { 551b69a54eeSKentaro Takeda struct list_head *pos; 552b69a54eeSKentaro Takeda bool done = true; 553b69a54eeSKentaro Takeda 554b69a54eeSKentaro Takeda list_for_each_cookie(pos, head->read_var2, &tomoyo_no_rewrite_list) { 555b69a54eeSKentaro Takeda struct tomoyo_no_rewrite_entry *ptr; 556b69a54eeSKentaro Takeda ptr = list_entry(pos, struct tomoyo_no_rewrite_entry, list); 557b69a54eeSKentaro Takeda if (ptr->is_deleted) 558b69a54eeSKentaro Takeda continue; 5597d2948b1STetsuo Handa done = tomoyo_io_printf(head, TOMOYO_KEYWORD_DENY_REWRITE 5607d2948b1STetsuo Handa "%s\n", ptr->pattern->name); 5617d2948b1STetsuo Handa if (!done) 562b69a54eeSKentaro Takeda break; 563b69a54eeSKentaro Takeda } 564b69a54eeSKentaro Takeda return done; 565b69a54eeSKentaro Takeda } 566b69a54eeSKentaro Takeda 567b69a54eeSKentaro Takeda /** 568b69a54eeSKentaro Takeda * tomoyo_update_file_acl - Update file's read/write/execute ACL. 569b69a54eeSKentaro Takeda * 570b69a54eeSKentaro Takeda * @filename: Filename. 571b69a54eeSKentaro Takeda * @perm: Permission (between 1 to 7). 572b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 573b69a54eeSKentaro Takeda * @is_delete: True if it is a delete request. 574b69a54eeSKentaro Takeda * 575b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 576b69a54eeSKentaro Takeda * 577b69a54eeSKentaro Takeda * This is legacy support interface for older policy syntax. 578b69a54eeSKentaro Takeda * Current policy syntax uses "allow_read/write" instead of "6", 579b69a54eeSKentaro Takeda * "allow_read" instead of "4", "allow_write" instead of "2", 580b69a54eeSKentaro Takeda * "allow_execute" instead of "1". 581fdb8ebb7STetsuo Handa * 582fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 583b69a54eeSKentaro Takeda */ 584b69a54eeSKentaro Takeda static int tomoyo_update_file_acl(const char *filename, u8 perm, 585b69a54eeSKentaro Takeda struct tomoyo_domain_info * const domain, 586b69a54eeSKentaro Takeda const bool is_delete) 587b69a54eeSKentaro Takeda { 588b69a54eeSKentaro Takeda if (perm > 7 || !perm) { 589b69a54eeSKentaro Takeda printk(KERN_DEBUG "%s: Invalid permission '%d %s'\n", 590b69a54eeSKentaro Takeda __func__, perm, filename); 591b69a54eeSKentaro Takeda return -EINVAL; 592b69a54eeSKentaro Takeda } 593b69a54eeSKentaro Takeda if (filename[0] != '@' && tomoyo_strendswith(filename, "/")) 594b69a54eeSKentaro Takeda /* 595b69a54eeSKentaro Takeda * Only 'allow_mkdir' and 'allow_rmdir' are valid for 596b69a54eeSKentaro Takeda * directory permissions. 597b69a54eeSKentaro Takeda */ 598b69a54eeSKentaro Takeda return 0; 599b69a54eeSKentaro Takeda if (perm & 4) 6007ef61233STetsuo Handa tomoyo_update_path_acl(TOMOYO_TYPE_READ, filename, domain, 6017ef61233STetsuo Handa is_delete); 602b69a54eeSKentaro Takeda if (perm & 2) 6037ef61233STetsuo Handa tomoyo_update_path_acl(TOMOYO_TYPE_WRITE, filename, domain, 6047ef61233STetsuo Handa is_delete); 605b69a54eeSKentaro Takeda if (perm & 1) 6067ef61233STetsuo Handa tomoyo_update_path_acl(TOMOYO_TYPE_EXECUTE, filename, domain, 6077ef61233STetsuo Handa is_delete); 608b69a54eeSKentaro Takeda return 0; 609b69a54eeSKentaro Takeda } 610b69a54eeSKentaro Takeda 611b69a54eeSKentaro Takeda /** 6127ef61233STetsuo Handa * tomoyo_path_acl2 - Check permission for single path operation. 613b69a54eeSKentaro Takeda * 614b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 615b69a54eeSKentaro Takeda * @filename: Filename to check. 616b69a54eeSKentaro Takeda * @perm: Permission. 617b69a54eeSKentaro Takeda * @may_use_pattern: True if patterned ACL is permitted. 618b69a54eeSKentaro Takeda * 619b69a54eeSKentaro Takeda * Returns 0 on success, -EPERM otherwise. 620fdb8ebb7STetsuo Handa * 621fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 622b69a54eeSKentaro Takeda */ 6237ef61233STetsuo Handa static int tomoyo_path_acl2(const struct tomoyo_domain_info *domain, 6247ef61233STetsuo Handa const struct tomoyo_path_info *filename, 6257ef61233STetsuo Handa const u32 perm, const bool may_use_pattern) 626b69a54eeSKentaro Takeda { 627b69a54eeSKentaro Takeda struct tomoyo_acl_info *ptr; 628b69a54eeSKentaro Takeda int error = -EPERM; 629b69a54eeSKentaro Takeda 630fdb8ebb7STetsuo Handa list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { 6317ef61233STetsuo Handa struct tomoyo_path_acl *acl; 6327ef61233STetsuo Handa if (ptr->type != TOMOYO_TYPE_PATH_ACL) 633b69a54eeSKentaro Takeda continue; 6347ef61233STetsuo Handa acl = container_of(ptr, struct tomoyo_path_acl, head); 635937bf613STetsuo Handa if (perm <= 0xFFFF) { 636b69a54eeSKentaro Takeda if (!(acl->perm & perm)) 637b69a54eeSKentaro Takeda continue; 638937bf613STetsuo Handa } else { 639937bf613STetsuo Handa if (!(acl->perm_high & (perm >> 16))) 640937bf613STetsuo Handa continue; 641937bf613STetsuo Handa } 642b69a54eeSKentaro Takeda if (may_use_pattern || !acl->filename->is_patterned) { 643b69a54eeSKentaro Takeda if (!tomoyo_path_matches_pattern(filename, 644b69a54eeSKentaro Takeda acl->filename)) 645b69a54eeSKentaro Takeda continue; 646b69a54eeSKentaro Takeda } else { 647b69a54eeSKentaro Takeda continue; 648b69a54eeSKentaro Takeda } 649b69a54eeSKentaro Takeda error = 0; 650b69a54eeSKentaro Takeda break; 651b69a54eeSKentaro Takeda } 652b69a54eeSKentaro Takeda return error; 653b69a54eeSKentaro Takeda } 654b69a54eeSKentaro Takeda 655b69a54eeSKentaro Takeda /** 656b69a54eeSKentaro Takeda * tomoyo_check_file_acl - Check permission for opening files. 657b69a54eeSKentaro Takeda * 658b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 659b69a54eeSKentaro Takeda * @filename: Filename to check. 660b69a54eeSKentaro Takeda * @operation: Mode ("read" or "write" or "read/write" or "execute"). 661b69a54eeSKentaro Takeda * 662b69a54eeSKentaro Takeda * Returns 0 on success, -EPERM otherwise. 663fdb8ebb7STetsuo Handa * 664fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 665b69a54eeSKentaro Takeda */ 666b69a54eeSKentaro Takeda static int tomoyo_check_file_acl(const struct tomoyo_domain_info *domain, 667b69a54eeSKentaro Takeda const struct tomoyo_path_info *filename, 668b69a54eeSKentaro Takeda const u8 operation) 669b69a54eeSKentaro Takeda { 670937bf613STetsuo Handa u32 perm = 0; 671b69a54eeSKentaro Takeda 672b69a54eeSKentaro Takeda if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE)) 673b69a54eeSKentaro Takeda return 0; 674b69a54eeSKentaro Takeda if (operation == 6) 6757ef61233STetsuo Handa perm = 1 << TOMOYO_TYPE_READ_WRITE; 676b69a54eeSKentaro Takeda else if (operation == 4) 6777ef61233STetsuo Handa perm = 1 << TOMOYO_TYPE_READ; 678b69a54eeSKentaro Takeda else if (operation == 2) 6797ef61233STetsuo Handa perm = 1 << TOMOYO_TYPE_WRITE; 680b69a54eeSKentaro Takeda else if (operation == 1) 6817ef61233STetsuo Handa perm = 1 << TOMOYO_TYPE_EXECUTE; 682b69a54eeSKentaro Takeda else 683b69a54eeSKentaro Takeda BUG(); 6847ef61233STetsuo Handa return tomoyo_path_acl2(domain, filename, perm, operation != 1); 685b69a54eeSKentaro Takeda } 686b69a54eeSKentaro Takeda 687b69a54eeSKentaro Takeda /** 688b69a54eeSKentaro Takeda * tomoyo_check_file_perm2 - Check permission for opening files. 689b69a54eeSKentaro Takeda * 690b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 691b69a54eeSKentaro Takeda * @filename: Filename to check. 692b69a54eeSKentaro Takeda * @perm: Mode ("read" or "write" or "read/write" or "execute"). 693b69a54eeSKentaro Takeda * @operation: Operation name passed used for verbose mode. 694b69a54eeSKentaro Takeda * @mode: Access control mode. 695b69a54eeSKentaro Takeda * 696b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 697fdb8ebb7STetsuo Handa * 698fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 699b69a54eeSKentaro Takeda */ 700b69a54eeSKentaro Takeda static int tomoyo_check_file_perm2(struct tomoyo_domain_info * const domain, 701b69a54eeSKentaro Takeda const struct tomoyo_path_info *filename, 702b69a54eeSKentaro Takeda const u8 perm, const char *operation, 703b69a54eeSKentaro Takeda const u8 mode) 704b69a54eeSKentaro Takeda { 705b69a54eeSKentaro Takeda const bool is_enforce = (mode == 3); 706b69a54eeSKentaro Takeda const char *msg = "<unknown>"; 707b69a54eeSKentaro Takeda int error = 0; 708b69a54eeSKentaro Takeda 709b69a54eeSKentaro Takeda if (!filename) 710b69a54eeSKentaro Takeda return 0; 711b69a54eeSKentaro Takeda error = tomoyo_check_file_acl(domain, filename, perm); 712ea13ddbaSTetsuo Handa if (error && perm == 4 && !domain->ignore_global_allow_read 713b69a54eeSKentaro Takeda && tomoyo_is_globally_readable_file(filename)) 714b69a54eeSKentaro Takeda error = 0; 715b69a54eeSKentaro Takeda if (perm == 6) 7167ef61233STetsuo Handa msg = tomoyo_path2keyword(TOMOYO_TYPE_READ_WRITE); 717b69a54eeSKentaro Takeda else if (perm == 4) 7187ef61233STetsuo Handa msg = tomoyo_path2keyword(TOMOYO_TYPE_READ); 719b69a54eeSKentaro Takeda else if (perm == 2) 7207ef61233STetsuo Handa msg = tomoyo_path2keyword(TOMOYO_TYPE_WRITE); 721b69a54eeSKentaro Takeda else if (perm == 1) 7227ef61233STetsuo Handa msg = tomoyo_path2keyword(TOMOYO_TYPE_EXECUTE); 723b69a54eeSKentaro Takeda else 724b69a54eeSKentaro Takeda BUG(); 725b69a54eeSKentaro Takeda if (!error) 726b69a54eeSKentaro Takeda return 0; 727b69a54eeSKentaro Takeda if (tomoyo_verbose_mode(domain)) 728b69a54eeSKentaro Takeda printk(KERN_WARNING "TOMOYO-%s: Access '%s(%s) %s' denied " 729b69a54eeSKentaro Takeda "for %s\n", tomoyo_get_msg(is_enforce), msg, operation, 730b69a54eeSKentaro Takeda filename->name, tomoyo_get_last_name(domain)); 731b69a54eeSKentaro Takeda if (is_enforce) 732b69a54eeSKentaro Takeda return error; 733b69a54eeSKentaro Takeda if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) { 734b69a54eeSKentaro Takeda /* Don't use patterns for execute permission. */ 735b69a54eeSKentaro Takeda const struct tomoyo_path_info *patterned_file = (perm != 1) ? 736b69a54eeSKentaro Takeda tomoyo_get_file_pattern(filename) : filename; 737b69a54eeSKentaro Takeda tomoyo_update_file_acl(patterned_file->name, perm, 738b69a54eeSKentaro Takeda domain, false); 739b69a54eeSKentaro Takeda } 740b69a54eeSKentaro Takeda return 0; 741b69a54eeSKentaro Takeda } 742b69a54eeSKentaro Takeda 743b69a54eeSKentaro Takeda /** 744b69a54eeSKentaro Takeda * tomoyo_write_file_policy - Update file related list. 745b69a54eeSKentaro Takeda * 746b69a54eeSKentaro Takeda * @data: String to parse. 747b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 748b69a54eeSKentaro Takeda * @is_delete: True if it is a delete request. 749b69a54eeSKentaro Takeda * 750b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 751fdb8ebb7STetsuo Handa * 752fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 753b69a54eeSKentaro Takeda */ 754b69a54eeSKentaro Takeda int tomoyo_write_file_policy(char *data, struct tomoyo_domain_info *domain, 755b69a54eeSKentaro Takeda const bool is_delete) 756b69a54eeSKentaro Takeda { 757b69a54eeSKentaro Takeda char *filename = strchr(data, ' '); 758b69a54eeSKentaro Takeda char *filename2; 759b69a54eeSKentaro Takeda unsigned int perm; 760b69a54eeSKentaro Takeda u8 type; 761b69a54eeSKentaro Takeda 762b69a54eeSKentaro Takeda if (!filename) 763b69a54eeSKentaro Takeda return -EINVAL; 764b69a54eeSKentaro Takeda *filename++ = '\0'; 765b69a54eeSKentaro Takeda if (sscanf(data, "%u", &perm) == 1) 766b69a54eeSKentaro Takeda return tomoyo_update_file_acl(filename, (u8) perm, domain, 767b69a54eeSKentaro Takeda is_delete); 768b69a54eeSKentaro Takeda if (strncmp(data, "allow_", 6)) 769b69a54eeSKentaro Takeda goto out; 770b69a54eeSKentaro Takeda data += 6; 7717ef61233STetsuo Handa for (type = 0; type < TOMOYO_MAX_PATH_OPERATION; type++) { 7727ef61233STetsuo Handa if (strcmp(data, tomoyo_path_keyword[type])) 773b69a54eeSKentaro Takeda continue; 7747ef61233STetsuo Handa return tomoyo_update_path_acl(type, filename, domain, 7757ef61233STetsuo Handa is_delete); 776b69a54eeSKentaro Takeda } 777b69a54eeSKentaro Takeda filename2 = strchr(filename, ' '); 778b69a54eeSKentaro Takeda if (!filename2) 779b69a54eeSKentaro Takeda goto out; 780b69a54eeSKentaro Takeda *filename2++ = '\0'; 7817ef61233STetsuo Handa for (type = 0; type < TOMOYO_MAX_PATH2_OPERATION; type++) { 7827ef61233STetsuo Handa if (strcmp(data, tomoyo_path2_keyword[type])) 783b69a54eeSKentaro Takeda continue; 7847ef61233STetsuo Handa return tomoyo_update_path2_acl(type, filename, filename2, 785b69a54eeSKentaro Takeda domain, is_delete); 786b69a54eeSKentaro Takeda } 787b69a54eeSKentaro Takeda out: 788b69a54eeSKentaro Takeda return -EINVAL; 789b69a54eeSKentaro Takeda } 790b69a54eeSKentaro Takeda 791b69a54eeSKentaro Takeda /** 7927ef61233STetsuo Handa * tomoyo_update_path_acl - Update "struct tomoyo_path_acl" list. 793b69a54eeSKentaro Takeda * 794b69a54eeSKentaro Takeda * @type: Type of operation. 795b69a54eeSKentaro Takeda * @filename: Filename. 796b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 797b69a54eeSKentaro Takeda * @is_delete: True if it is a delete request. 798b69a54eeSKentaro Takeda * 799b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 800fdb8ebb7STetsuo Handa * 801fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 802b69a54eeSKentaro Takeda */ 8037ef61233STetsuo Handa static int tomoyo_update_path_acl(const u8 type, const char *filename, 8047ef61233STetsuo Handa struct tomoyo_domain_info *const domain, 8057ef61233STetsuo Handa const bool is_delete) 806b69a54eeSKentaro Takeda { 807937bf613STetsuo Handa static const u32 rw_mask = 8087ef61233STetsuo Handa (1 << TOMOYO_TYPE_READ) | (1 << TOMOYO_TYPE_WRITE); 809b69a54eeSKentaro Takeda const struct tomoyo_path_info *saved_filename; 810b69a54eeSKentaro Takeda struct tomoyo_acl_info *ptr; 8117ef61233STetsuo Handa struct tomoyo_path_acl *entry = NULL; 812ca0b7df3STetsuo Handa int error = is_delete ? -ENOENT : -ENOMEM; 813937bf613STetsuo Handa const u32 perm = 1 << type; 814b69a54eeSKentaro Takeda 815b69a54eeSKentaro Takeda if (!domain) 816b69a54eeSKentaro Takeda return -EINVAL; 81717080008STetsuo Handa if (!tomoyo_is_correct_path(filename, 0, 0, 0)) 818b69a54eeSKentaro Takeda return -EINVAL; 819bf24fb01STetsuo Handa saved_filename = tomoyo_get_name(filename); 820b69a54eeSKentaro Takeda if (!saved_filename) 821b69a54eeSKentaro Takeda return -ENOMEM; 822ca0b7df3STetsuo Handa if (!is_delete) 8234e5d6f7eSTetsuo Handa entry = kmalloc(sizeof(*entry), GFP_NOFS); 824f737d95dSTetsuo Handa mutex_lock(&tomoyo_policy_lock); 825fdb8ebb7STetsuo Handa list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { 8267ef61233STetsuo Handa struct tomoyo_path_acl *acl = 8277ef61233STetsuo Handa container_of(ptr, struct tomoyo_path_acl, head); 8287ef61233STetsuo Handa if (ptr->type != TOMOYO_TYPE_PATH_ACL) 829b69a54eeSKentaro Takeda continue; 830b69a54eeSKentaro Takeda if (acl->filename != saved_filename) 831b69a54eeSKentaro Takeda continue; 832ca0b7df3STetsuo Handa if (is_delete) { 833ca0b7df3STetsuo Handa if (perm <= 0xFFFF) 834ca0b7df3STetsuo Handa acl->perm &= ~perm; 835ca0b7df3STetsuo Handa else 836ca0b7df3STetsuo Handa acl->perm_high &= ~(perm >> 16); 837ca0b7df3STetsuo Handa if ((acl->perm & rw_mask) != rw_mask) 8387ef61233STetsuo Handa acl->perm &= ~(1 << TOMOYO_TYPE_READ_WRITE); 8397ef61233STetsuo Handa else if (!(acl->perm & (1 << TOMOYO_TYPE_READ_WRITE))) 840ca0b7df3STetsuo Handa acl->perm &= ~rw_mask; 841ca0b7df3STetsuo Handa } else { 842937bf613STetsuo Handa if (perm <= 0xFFFF) 843b69a54eeSKentaro Takeda acl->perm |= perm; 844937bf613STetsuo Handa else 845937bf613STetsuo Handa acl->perm_high |= (perm >> 16); 846b69a54eeSKentaro Takeda if ((acl->perm & rw_mask) == rw_mask) 8477ef61233STetsuo Handa acl->perm |= 1 << TOMOYO_TYPE_READ_WRITE; 8487ef61233STetsuo Handa else if (acl->perm & (1 << TOMOYO_TYPE_READ_WRITE)) 849b69a54eeSKentaro Takeda acl->perm |= rw_mask; 850b69a54eeSKentaro Takeda } 851b69a54eeSKentaro Takeda error = 0; 852b69a54eeSKentaro Takeda break; 853b69a54eeSKentaro Takeda } 854ca0b7df3STetsuo Handa if (!is_delete && error && tomoyo_memory_ok(entry)) { 8557ef61233STetsuo Handa entry->head.type = TOMOYO_TYPE_PATH_ACL; 856ca0b7df3STetsuo Handa if (perm <= 0xFFFF) 857ca0b7df3STetsuo Handa entry->perm = perm; 858ca0b7df3STetsuo Handa else 859ca0b7df3STetsuo Handa entry->perm_high = (perm >> 16); 8607ef61233STetsuo Handa if (perm == (1 << TOMOYO_TYPE_READ_WRITE)) 861ca0b7df3STetsuo Handa entry->perm |= rw_mask; 862ca0b7df3STetsuo Handa entry->filename = saved_filename; 863bf24fb01STetsuo Handa saved_filename = NULL; 864ca0b7df3STetsuo Handa list_add_tail_rcu(&entry->head.list, &domain->acl_info_list); 865ca0b7df3STetsuo Handa entry = NULL; 866ca0b7df3STetsuo Handa error = 0; 867ca0b7df3STetsuo Handa } 868f737d95dSTetsuo Handa mutex_unlock(&tomoyo_policy_lock); 869ca0b7df3STetsuo Handa kfree(entry); 870bf24fb01STetsuo Handa tomoyo_put_name(saved_filename); 871b69a54eeSKentaro Takeda return error; 872b69a54eeSKentaro Takeda } 873b69a54eeSKentaro Takeda 874b69a54eeSKentaro Takeda /** 8757ef61233STetsuo Handa * tomoyo_update_path2_acl - Update "struct tomoyo_path2_acl" list. 876b69a54eeSKentaro Takeda * 877b69a54eeSKentaro Takeda * @type: Type of operation. 878b69a54eeSKentaro Takeda * @filename1: First filename. 879b69a54eeSKentaro Takeda * @filename2: Second filename. 880b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 881b69a54eeSKentaro Takeda * @is_delete: True if it is a delete request. 882b69a54eeSKentaro Takeda * 883b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 884fdb8ebb7STetsuo Handa * 885fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 886b69a54eeSKentaro Takeda */ 8877ef61233STetsuo Handa static int tomoyo_update_path2_acl(const u8 type, const char *filename1, 888b69a54eeSKentaro Takeda const char *filename2, 8897ef61233STetsuo Handa struct tomoyo_domain_info *const domain, 8907ef61233STetsuo Handa const bool is_delete) 891b69a54eeSKentaro Takeda { 892b69a54eeSKentaro Takeda const struct tomoyo_path_info *saved_filename1; 893b69a54eeSKentaro Takeda const struct tomoyo_path_info *saved_filename2; 894b69a54eeSKentaro Takeda struct tomoyo_acl_info *ptr; 8957ef61233STetsuo Handa struct tomoyo_path2_acl *entry = NULL; 896ca0b7df3STetsuo Handa int error = is_delete ? -ENOENT : -ENOMEM; 897b69a54eeSKentaro Takeda const u8 perm = 1 << type; 898b69a54eeSKentaro Takeda 899b69a54eeSKentaro Takeda if (!domain) 900b69a54eeSKentaro Takeda return -EINVAL; 90117080008STetsuo Handa if (!tomoyo_is_correct_path(filename1, 0, 0, 0) || 90217080008STetsuo Handa !tomoyo_is_correct_path(filename2, 0, 0, 0)) 903b69a54eeSKentaro Takeda return -EINVAL; 904bf24fb01STetsuo Handa saved_filename1 = tomoyo_get_name(filename1); 905bf24fb01STetsuo Handa saved_filename2 = tomoyo_get_name(filename2); 906b69a54eeSKentaro Takeda if (!saved_filename1 || !saved_filename2) 907ca0b7df3STetsuo Handa goto out; 908ca0b7df3STetsuo Handa if (!is_delete) 9094e5d6f7eSTetsuo Handa entry = kmalloc(sizeof(*entry), GFP_NOFS); 910f737d95dSTetsuo Handa mutex_lock(&tomoyo_policy_lock); 911ca0b7df3STetsuo Handa list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { 9127ef61233STetsuo Handa struct tomoyo_path2_acl *acl = 9137ef61233STetsuo Handa container_of(ptr, struct tomoyo_path2_acl, head); 9147ef61233STetsuo Handa if (ptr->type != TOMOYO_TYPE_PATH2_ACL) 915ca0b7df3STetsuo Handa continue; 916ca0b7df3STetsuo Handa if (acl->filename1 != saved_filename1 || 917ca0b7df3STetsuo Handa acl->filename2 != saved_filename2) 918ca0b7df3STetsuo Handa continue; 919b69a54eeSKentaro Takeda if (is_delete) 920b69a54eeSKentaro Takeda acl->perm &= ~perm; 921ca0b7df3STetsuo Handa else 922ca0b7df3STetsuo Handa acl->perm |= perm; 923b69a54eeSKentaro Takeda error = 0; 924b69a54eeSKentaro Takeda break; 925b69a54eeSKentaro Takeda } 926ca0b7df3STetsuo Handa if (!is_delete && error && tomoyo_memory_ok(entry)) { 9277ef61233STetsuo Handa entry->head.type = TOMOYO_TYPE_PATH2_ACL; 928ca0b7df3STetsuo Handa entry->perm = perm; 929ca0b7df3STetsuo Handa entry->filename1 = saved_filename1; 930bf24fb01STetsuo Handa saved_filename1 = NULL; 931ca0b7df3STetsuo Handa entry->filename2 = saved_filename2; 932bf24fb01STetsuo Handa saved_filename2 = NULL; 933ca0b7df3STetsuo Handa list_add_tail_rcu(&entry->head.list, &domain->acl_info_list); 934ca0b7df3STetsuo Handa entry = NULL; 935ca0b7df3STetsuo Handa error = 0; 936ca0b7df3STetsuo Handa } 937f737d95dSTetsuo Handa mutex_unlock(&tomoyo_policy_lock); 938ca0b7df3STetsuo Handa out: 939bf24fb01STetsuo Handa tomoyo_put_name(saved_filename1); 940bf24fb01STetsuo Handa tomoyo_put_name(saved_filename2); 941ca0b7df3STetsuo Handa kfree(entry); 942b69a54eeSKentaro Takeda return error; 943b69a54eeSKentaro Takeda } 944b69a54eeSKentaro Takeda 945b69a54eeSKentaro Takeda /** 9467ef61233STetsuo Handa * tomoyo_path_acl - Check permission for single path operation. 947b69a54eeSKentaro Takeda * 948b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 949b69a54eeSKentaro Takeda * @type: Type of operation. 950b69a54eeSKentaro Takeda * @filename: Filename to check. 951b69a54eeSKentaro Takeda * 952b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 953fdb8ebb7STetsuo Handa * 954fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 955b69a54eeSKentaro Takeda */ 9567ef61233STetsuo Handa static int tomoyo_path_acl(struct tomoyo_domain_info *domain, const u8 type, 957b69a54eeSKentaro Takeda const struct tomoyo_path_info *filename) 958b69a54eeSKentaro Takeda { 959b69a54eeSKentaro Takeda if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE)) 960b69a54eeSKentaro Takeda return 0; 9617ef61233STetsuo Handa return tomoyo_path_acl2(domain, filename, 1 << type, 1); 962b69a54eeSKentaro Takeda } 963b69a54eeSKentaro Takeda 964b69a54eeSKentaro Takeda /** 9657ef61233STetsuo Handa * tomoyo_path2_acl - Check permission for double path operation. 966b69a54eeSKentaro Takeda * 967b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 968b69a54eeSKentaro Takeda * @type: Type of operation. 969b69a54eeSKentaro Takeda * @filename1: First filename to check. 970b69a54eeSKentaro Takeda * @filename2: Second filename to check. 971b69a54eeSKentaro Takeda * 972b69a54eeSKentaro Takeda * Returns 0 on success, -EPERM otherwise. 973fdb8ebb7STetsuo Handa * 974fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 975b69a54eeSKentaro Takeda */ 9767ef61233STetsuo Handa static int tomoyo_path2_acl(const struct tomoyo_domain_info *domain, 977b69a54eeSKentaro Takeda const u8 type, 9787ef61233STetsuo Handa const struct tomoyo_path_info *filename1, 9797ef61233STetsuo Handa const struct tomoyo_path_info *filename2) 980b69a54eeSKentaro Takeda { 981b69a54eeSKentaro Takeda struct tomoyo_acl_info *ptr; 982b69a54eeSKentaro Takeda const u8 perm = 1 << type; 983b69a54eeSKentaro Takeda int error = -EPERM; 984b69a54eeSKentaro Takeda 985b69a54eeSKentaro Takeda if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE)) 986b69a54eeSKentaro Takeda return 0; 987fdb8ebb7STetsuo Handa list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { 9887ef61233STetsuo Handa struct tomoyo_path2_acl *acl; 9897ef61233STetsuo Handa if (ptr->type != TOMOYO_TYPE_PATH2_ACL) 990b69a54eeSKentaro Takeda continue; 9917ef61233STetsuo Handa acl = container_of(ptr, struct tomoyo_path2_acl, head); 992b69a54eeSKentaro Takeda if (!(acl->perm & perm)) 993b69a54eeSKentaro Takeda continue; 994b69a54eeSKentaro Takeda if (!tomoyo_path_matches_pattern(filename1, acl->filename1)) 995b69a54eeSKentaro Takeda continue; 996b69a54eeSKentaro Takeda if (!tomoyo_path_matches_pattern(filename2, acl->filename2)) 997b69a54eeSKentaro Takeda continue; 998b69a54eeSKentaro Takeda error = 0; 999b69a54eeSKentaro Takeda break; 1000b69a54eeSKentaro Takeda } 1001b69a54eeSKentaro Takeda return error; 1002b69a54eeSKentaro Takeda } 1003b69a54eeSKentaro Takeda 1004b69a54eeSKentaro Takeda /** 10057ef61233STetsuo Handa * tomoyo_path_permission2 - Check permission for single path operation. 1006b69a54eeSKentaro Takeda * 1007b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 1008b69a54eeSKentaro Takeda * @operation: Type of operation. 1009b69a54eeSKentaro Takeda * @filename: Filename to check. 1010b69a54eeSKentaro Takeda * @mode: Access control mode. 1011b69a54eeSKentaro Takeda * 1012b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 1013fdb8ebb7STetsuo Handa * 1014fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 1015b69a54eeSKentaro Takeda */ 10167ef61233STetsuo Handa static int tomoyo_path_permission2(struct tomoyo_domain_info *const domain, 10177ef61233STetsuo Handa u8 operation, 10187ef61233STetsuo Handa const struct tomoyo_path_info *filename, 10197ef61233STetsuo Handa const u8 mode) 1020b69a54eeSKentaro Takeda { 1021b69a54eeSKentaro Takeda const char *msg; 1022b69a54eeSKentaro Takeda int error; 1023b69a54eeSKentaro Takeda const bool is_enforce = (mode == 3); 1024b69a54eeSKentaro Takeda 1025b69a54eeSKentaro Takeda if (!mode) 1026b69a54eeSKentaro Takeda return 0; 1027b69a54eeSKentaro Takeda next: 10287ef61233STetsuo Handa error = tomoyo_path_acl(domain, operation, filename); 10297ef61233STetsuo Handa msg = tomoyo_path2keyword(operation); 1030b69a54eeSKentaro Takeda if (!error) 1031b69a54eeSKentaro Takeda goto ok; 1032b69a54eeSKentaro Takeda if (tomoyo_verbose_mode(domain)) 1033b69a54eeSKentaro Takeda printk(KERN_WARNING "TOMOYO-%s: Access '%s %s' denied for %s\n", 1034b69a54eeSKentaro Takeda tomoyo_get_msg(is_enforce), msg, filename->name, 1035b69a54eeSKentaro Takeda tomoyo_get_last_name(domain)); 1036b69a54eeSKentaro Takeda if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) { 1037b69a54eeSKentaro Takeda const char *name = tomoyo_get_file_pattern(filename)->name; 10387ef61233STetsuo Handa tomoyo_update_path_acl(operation, name, domain, false); 1039b69a54eeSKentaro Takeda } 1040b69a54eeSKentaro Takeda if (!is_enforce) 1041b69a54eeSKentaro Takeda error = 0; 1042b69a54eeSKentaro Takeda ok: 1043b69a54eeSKentaro Takeda /* 1044b69a54eeSKentaro Takeda * Since "allow_truncate" doesn't imply "allow_rewrite" permission, 1045b69a54eeSKentaro Takeda * we need to check "allow_rewrite" permission if the filename is 1046b69a54eeSKentaro Takeda * specified by "deny_rewrite" keyword. 1047b69a54eeSKentaro Takeda */ 10487ef61233STetsuo Handa if (!error && operation == TOMOYO_TYPE_TRUNCATE && 1049b69a54eeSKentaro Takeda tomoyo_is_no_rewrite_file(filename)) { 10507ef61233STetsuo Handa operation = TOMOYO_TYPE_REWRITE; 1051b69a54eeSKentaro Takeda goto next; 1052b69a54eeSKentaro Takeda } 1053b69a54eeSKentaro Takeda return error; 1054b69a54eeSKentaro Takeda } 1055b69a54eeSKentaro Takeda 1056b69a54eeSKentaro Takeda /** 1057b69a54eeSKentaro Takeda * tomoyo_check_exec_perm - Check permission for "execute". 1058b69a54eeSKentaro Takeda * 1059b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 1060b69a54eeSKentaro Takeda * @filename: Check permission for "execute". 1061b69a54eeSKentaro Takeda * 1062b69a54eeSKentaro Takeda * Returns 0 on success, negativevalue otherwise. 1063fdb8ebb7STetsuo Handa * 1064fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 1065b69a54eeSKentaro Takeda */ 1066b69a54eeSKentaro Takeda int tomoyo_check_exec_perm(struct tomoyo_domain_info *domain, 1067bcb86975STetsuo Handa const struct tomoyo_path_info *filename) 1068b69a54eeSKentaro Takeda { 1069b69a54eeSKentaro Takeda const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); 1070b69a54eeSKentaro Takeda 1071b69a54eeSKentaro Takeda if (!mode) 1072b69a54eeSKentaro Takeda return 0; 1073b69a54eeSKentaro Takeda return tomoyo_check_file_perm2(domain, filename, 1, "do_execve", mode); 1074b69a54eeSKentaro Takeda } 1075b69a54eeSKentaro Takeda 1076b69a54eeSKentaro Takeda /** 1077b69a54eeSKentaro Takeda * tomoyo_check_open_permission - Check permission for "read" and "write". 1078b69a54eeSKentaro Takeda * 1079b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 1080b69a54eeSKentaro Takeda * @path: Pointer to "struct path". 1081b69a54eeSKentaro Takeda * @flag: Flags for open(). 1082b69a54eeSKentaro Takeda * 1083b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 1084b69a54eeSKentaro Takeda */ 1085b69a54eeSKentaro Takeda int tomoyo_check_open_permission(struct tomoyo_domain_info *domain, 1086b69a54eeSKentaro Takeda struct path *path, const int flag) 1087b69a54eeSKentaro Takeda { 1088b69a54eeSKentaro Takeda const u8 acc_mode = ACC_MODE(flag); 1089b69a54eeSKentaro Takeda int error = -ENOMEM; 1090b69a54eeSKentaro Takeda struct tomoyo_path_info *buf; 1091b69a54eeSKentaro Takeda const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); 1092b69a54eeSKentaro Takeda const bool is_enforce = (mode == 3); 1093fdb8ebb7STetsuo Handa int idx; 1094b69a54eeSKentaro Takeda 1095b69a54eeSKentaro Takeda if (!mode || !path->mnt) 1096b69a54eeSKentaro Takeda return 0; 1097b69a54eeSKentaro Takeda if (acc_mode == 0) 1098b69a54eeSKentaro Takeda return 0; 1099b69a54eeSKentaro Takeda if (path->dentry->d_inode && S_ISDIR(path->dentry->d_inode->i_mode)) 1100b69a54eeSKentaro Takeda /* 1101b69a54eeSKentaro Takeda * I don't check directories here because mkdir() and rmdir() 1102b69a54eeSKentaro Takeda * don't call me. 1103b69a54eeSKentaro Takeda */ 1104b69a54eeSKentaro Takeda return 0; 1105fdb8ebb7STetsuo Handa idx = tomoyo_read_lock(); 1106b69a54eeSKentaro Takeda buf = tomoyo_get_path(path); 1107b69a54eeSKentaro Takeda if (!buf) 1108b69a54eeSKentaro Takeda goto out; 1109b69a54eeSKentaro Takeda error = 0; 1110b69a54eeSKentaro Takeda /* 1111b69a54eeSKentaro Takeda * If the filename is specified by "deny_rewrite" keyword, 1112b69a54eeSKentaro Takeda * we need to check "allow_rewrite" permission when the filename is not 1113b69a54eeSKentaro Takeda * opened for append mode or the filename is truncated at open time. 1114b69a54eeSKentaro Takeda */ 1115b69a54eeSKentaro Takeda if ((acc_mode & MAY_WRITE) && 1116b69a54eeSKentaro Takeda ((flag & O_TRUNC) || !(flag & O_APPEND)) && 1117b69a54eeSKentaro Takeda (tomoyo_is_no_rewrite_file(buf))) { 11187ef61233STetsuo Handa error = tomoyo_path_permission2(domain, TOMOYO_TYPE_REWRITE, 1119b69a54eeSKentaro Takeda buf, mode); 1120b69a54eeSKentaro Takeda } 1121b69a54eeSKentaro Takeda if (!error) 1122b69a54eeSKentaro Takeda error = tomoyo_check_file_perm2(domain, buf, acc_mode, "open", 1123b69a54eeSKentaro Takeda mode); 1124b69a54eeSKentaro Takeda if (!error && (flag & O_TRUNC)) 11257ef61233STetsuo Handa error = tomoyo_path_permission2(domain, TOMOYO_TYPE_TRUNCATE, 1126b69a54eeSKentaro Takeda buf, mode); 1127b69a54eeSKentaro Takeda out: 11288e2d39a1STetsuo Handa kfree(buf); 1129fdb8ebb7STetsuo Handa tomoyo_read_unlock(idx); 1130b69a54eeSKentaro Takeda if (!is_enforce) 1131b69a54eeSKentaro Takeda error = 0; 1132b69a54eeSKentaro Takeda return error; 1133b69a54eeSKentaro Takeda } 1134b69a54eeSKentaro Takeda 1135b69a54eeSKentaro Takeda /** 11367ef61233STetsuo Handa * tomoyo_path_perm - Check permission for "create", "unlink", "mkdir", "rmdir", "mkfifo", "mksock", "mkblock", "mkchar", "truncate", "symlink", "ioctl", "chmod", "chown", "chgrp", "chroot", "mount" and "unmount". 1137b69a54eeSKentaro Takeda * 1138b69a54eeSKentaro Takeda * @operation: Type of operation. 1139b69a54eeSKentaro Takeda * @path: Pointer to "struct path". 1140b69a54eeSKentaro Takeda * 1141b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 1142b69a54eeSKentaro Takeda */ 114397d6931eSTetsuo Handa int tomoyo_path_perm(const u8 operation, struct path *path) 1144b69a54eeSKentaro Takeda { 1145b69a54eeSKentaro Takeda int error = -ENOMEM; 1146b69a54eeSKentaro Takeda struct tomoyo_path_info *buf; 114797d6931eSTetsuo Handa struct tomoyo_domain_info *domain = tomoyo_domain(); 1148b69a54eeSKentaro Takeda const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); 1149b69a54eeSKentaro Takeda const bool is_enforce = (mode == 3); 1150fdb8ebb7STetsuo Handa int idx; 1151b69a54eeSKentaro Takeda 1152b69a54eeSKentaro Takeda if (!mode || !path->mnt) 1153b69a54eeSKentaro Takeda return 0; 1154fdb8ebb7STetsuo Handa idx = tomoyo_read_lock(); 1155b69a54eeSKentaro Takeda buf = tomoyo_get_path(path); 1156b69a54eeSKentaro Takeda if (!buf) 1157b69a54eeSKentaro Takeda goto out; 1158b69a54eeSKentaro Takeda switch (operation) { 11597ef61233STetsuo Handa case TOMOYO_TYPE_MKDIR: 11607ef61233STetsuo Handa case TOMOYO_TYPE_RMDIR: 11617ef61233STetsuo Handa case TOMOYO_TYPE_CHROOT: 1162b69a54eeSKentaro Takeda if (!buf->is_dir) { 1163b69a54eeSKentaro Takeda /* 1164b69a54eeSKentaro Takeda * tomoyo_get_path() reserves space for appending "/." 1165b69a54eeSKentaro Takeda */ 1166b69a54eeSKentaro Takeda strcat((char *) buf->name, "/"); 1167b69a54eeSKentaro Takeda tomoyo_fill_path_info(buf); 1168b69a54eeSKentaro Takeda } 1169b69a54eeSKentaro Takeda } 11707ef61233STetsuo Handa error = tomoyo_path_permission2(domain, operation, buf, mode); 1171b69a54eeSKentaro Takeda out: 11728e2d39a1STetsuo Handa kfree(buf); 1173fdb8ebb7STetsuo Handa tomoyo_read_unlock(idx); 1174b69a54eeSKentaro Takeda if (!is_enforce) 1175b69a54eeSKentaro Takeda error = 0; 1176b69a54eeSKentaro Takeda return error; 1177b69a54eeSKentaro Takeda } 1178b69a54eeSKentaro Takeda 1179b69a54eeSKentaro Takeda /** 1180b69a54eeSKentaro Takeda * tomoyo_check_rewrite_permission - Check permission for "rewrite". 1181b69a54eeSKentaro Takeda * 1182b69a54eeSKentaro Takeda * @filp: Pointer to "struct file". 1183b69a54eeSKentaro Takeda * 1184b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 1185b69a54eeSKentaro Takeda */ 118697d6931eSTetsuo Handa int tomoyo_check_rewrite_permission(struct file *filp) 1187b69a54eeSKentaro Takeda { 1188b69a54eeSKentaro Takeda int error = -ENOMEM; 118997d6931eSTetsuo Handa struct tomoyo_domain_info *domain = tomoyo_domain(); 1190b69a54eeSKentaro Takeda const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); 1191b69a54eeSKentaro Takeda const bool is_enforce = (mode == 3); 1192b69a54eeSKentaro Takeda struct tomoyo_path_info *buf; 1193fdb8ebb7STetsuo Handa int idx; 1194b69a54eeSKentaro Takeda 1195b69a54eeSKentaro Takeda if (!mode || !filp->f_path.mnt) 1196b69a54eeSKentaro Takeda return 0; 1197fdb8ebb7STetsuo Handa 1198fdb8ebb7STetsuo Handa idx = tomoyo_read_lock(); 1199b69a54eeSKentaro Takeda buf = tomoyo_get_path(&filp->f_path); 1200b69a54eeSKentaro Takeda if (!buf) 1201b69a54eeSKentaro Takeda goto out; 1202b69a54eeSKentaro Takeda if (!tomoyo_is_no_rewrite_file(buf)) { 1203b69a54eeSKentaro Takeda error = 0; 1204b69a54eeSKentaro Takeda goto out; 1205b69a54eeSKentaro Takeda } 12067ef61233STetsuo Handa error = tomoyo_path_permission2(domain, TOMOYO_TYPE_REWRITE, buf, mode); 1207b69a54eeSKentaro Takeda out: 12088e2d39a1STetsuo Handa kfree(buf); 1209fdb8ebb7STetsuo Handa tomoyo_read_unlock(idx); 1210b69a54eeSKentaro Takeda if (!is_enforce) 1211b69a54eeSKentaro Takeda error = 0; 1212b69a54eeSKentaro Takeda return error; 1213b69a54eeSKentaro Takeda } 1214b69a54eeSKentaro Takeda 1215b69a54eeSKentaro Takeda /** 12167ef61233STetsuo Handa * tomoyo_path2_perm - Check permission for "rename", "link" and "pivot_root". 1217b69a54eeSKentaro Takeda * 1218b69a54eeSKentaro Takeda * @operation: Type of operation. 1219b69a54eeSKentaro Takeda * @path1: Pointer to "struct path". 1220b69a54eeSKentaro Takeda * @path2: Pointer to "struct path". 1221b69a54eeSKentaro Takeda * 1222b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 1223b69a54eeSKentaro Takeda */ 122497d6931eSTetsuo Handa int tomoyo_path2_perm(const u8 operation, struct path *path1, 1225b69a54eeSKentaro Takeda struct path *path2) 1226b69a54eeSKentaro Takeda { 1227b69a54eeSKentaro Takeda int error = -ENOMEM; 1228b69a54eeSKentaro Takeda struct tomoyo_path_info *buf1, *buf2; 122997d6931eSTetsuo Handa struct tomoyo_domain_info *domain = tomoyo_domain(); 1230b69a54eeSKentaro Takeda const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); 1231b69a54eeSKentaro Takeda const bool is_enforce = (mode == 3); 1232b69a54eeSKentaro Takeda const char *msg; 1233fdb8ebb7STetsuo Handa int idx; 1234b69a54eeSKentaro Takeda 1235b69a54eeSKentaro Takeda if (!mode || !path1->mnt || !path2->mnt) 1236b69a54eeSKentaro Takeda return 0; 1237fdb8ebb7STetsuo Handa idx = tomoyo_read_lock(); 1238b69a54eeSKentaro Takeda buf1 = tomoyo_get_path(path1); 1239b69a54eeSKentaro Takeda buf2 = tomoyo_get_path(path2); 1240b69a54eeSKentaro Takeda if (!buf1 || !buf2) 1241b69a54eeSKentaro Takeda goto out; 1242b69a54eeSKentaro Takeda { 1243b69a54eeSKentaro Takeda struct dentry *dentry = path1->dentry; 1244b69a54eeSKentaro Takeda if (dentry->d_inode && S_ISDIR(dentry->d_inode->i_mode)) { 1245b69a54eeSKentaro Takeda /* 1246b69a54eeSKentaro Takeda * tomoyo_get_path() reserves space for appending "/." 1247b69a54eeSKentaro Takeda */ 1248b69a54eeSKentaro Takeda if (!buf1->is_dir) { 1249b69a54eeSKentaro Takeda strcat((char *) buf1->name, "/"); 1250b69a54eeSKentaro Takeda tomoyo_fill_path_info(buf1); 1251b69a54eeSKentaro Takeda } 1252b69a54eeSKentaro Takeda if (!buf2->is_dir) { 1253b69a54eeSKentaro Takeda strcat((char *) buf2->name, "/"); 1254b69a54eeSKentaro Takeda tomoyo_fill_path_info(buf2); 1255b69a54eeSKentaro Takeda } 1256b69a54eeSKentaro Takeda } 1257b69a54eeSKentaro Takeda } 12587ef61233STetsuo Handa error = tomoyo_path2_acl(domain, operation, buf1, buf2); 12597ef61233STetsuo Handa msg = tomoyo_path22keyword(operation); 1260b69a54eeSKentaro Takeda if (!error) 1261b69a54eeSKentaro Takeda goto out; 1262b69a54eeSKentaro Takeda if (tomoyo_verbose_mode(domain)) 1263b69a54eeSKentaro Takeda printk(KERN_WARNING "TOMOYO-%s: Access '%s %s %s' " 1264b69a54eeSKentaro Takeda "denied for %s\n", tomoyo_get_msg(is_enforce), 1265b69a54eeSKentaro Takeda msg, buf1->name, buf2->name, 1266b69a54eeSKentaro Takeda tomoyo_get_last_name(domain)); 1267b69a54eeSKentaro Takeda if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) { 1268b69a54eeSKentaro Takeda const char *name1 = tomoyo_get_file_pattern(buf1)->name; 1269b69a54eeSKentaro Takeda const char *name2 = tomoyo_get_file_pattern(buf2)->name; 12707ef61233STetsuo Handa tomoyo_update_path2_acl(operation, name1, name2, domain, 1271b69a54eeSKentaro Takeda false); 1272b69a54eeSKentaro Takeda } 1273b69a54eeSKentaro Takeda out: 12748e2d39a1STetsuo Handa kfree(buf1); 12758e2d39a1STetsuo Handa kfree(buf2); 1276fdb8ebb7STetsuo Handa tomoyo_read_unlock(idx); 1277b69a54eeSKentaro Takeda if (!is_enforce) 1278b69a54eeSKentaro Takeda error = 0; 1279b69a54eeSKentaro Takeda return error; 1280b69a54eeSKentaro Takeda } 1281