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" 135a0e3ad6STejun Heo #include <linux/slab.h> 14b69a54eeSKentaro Takeda 15b69a54eeSKentaro Takeda /* Keyword array for single path operations. */ 167ef61233STetsuo Handa static const char *tomoyo_path_keyword[TOMOYO_MAX_PATH_OPERATION] = { 177ef61233STetsuo Handa [TOMOYO_TYPE_READ_WRITE] = "read/write", 187ef61233STetsuo Handa [TOMOYO_TYPE_EXECUTE] = "execute", 197ef61233STetsuo Handa [TOMOYO_TYPE_READ] = "read", 207ef61233STetsuo Handa [TOMOYO_TYPE_WRITE] = "write", 217ef61233STetsuo Handa [TOMOYO_TYPE_CREATE] = "create", 227ef61233STetsuo Handa [TOMOYO_TYPE_UNLINK] = "unlink", 237ef61233STetsuo Handa [TOMOYO_TYPE_MKDIR] = "mkdir", 247ef61233STetsuo Handa [TOMOYO_TYPE_RMDIR] = "rmdir", 257ef61233STetsuo Handa [TOMOYO_TYPE_MKFIFO] = "mkfifo", 267ef61233STetsuo Handa [TOMOYO_TYPE_MKSOCK] = "mksock", 277ef61233STetsuo Handa [TOMOYO_TYPE_MKBLOCK] = "mkblock", 287ef61233STetsuo Handa [TOMOYO_TYPE_MKCHAR] = "mkchar", 297ef61233STetsuo Handa [TOMOYO_TYPE_TRUNCATE] = "truncate", 307ef61233STetsuo Handa [TOMOYO_TYPE_SYMLINK] = "symlink", 317ef61233STetsuo Handa [TOMOYO_TYPE_REWRITE] = "rewrite", 327ef61233STetsuo Handa [TOMOYO_TYPE_IOCTL] = "ioctl", 337ef61233STetsuo Handa [TOMOYO_TYPE_CHMOD] = "chmod", 347ef61233STetsuo Handa [TOMOYO_TYPE_CHOWN] = "chown", 357ef61233STetsuo Handa [TOMOYO_TYPE_CHGRP] = "chgrp", 367ef61233STetsuo Handa [TOMOYO_TYPE_CHROOT] = "chroot", 377ef61233STetsuo Handa [TOMOYO_TYPE_MOUNT] = "mount", 387ef61233STetsuo Handa [TOMOYO_TYPE_UMOUNT] = "unmount", 39b69a54eeSKentaro Takeda }; 40b69a54eeSKentaro Takeda 41b69a54eeSKentaro Takeda /* Keyword array for double path operations. */ 427ef61233STetsuo Handa static const char *tomoyo_path2_keyword[TOMOYO_MAX_PATH2_OPERATION] = { 437ef61233STetsuo Handa [TOMOYO_TYPE_LINK] = "link", 447ef61233STetsuo Handa [TOMOYO_TYPE_RENAME] = "rename", 457ef61233STetsuo Handa [TOMOYO_TYPE_PIVOT_ROOT] = "pivot_root", 46b69a54eeSKentaro Takeda }; 47b69a54eeSKentaro Takeda 48b69a54eeSKentaro Takeda /** 497ef61233STetsuo Handa * tomoyo_path2keyword - Get the name of single path operation. 50b69a54eeSKentaro Takeda * 51b69a54eeSKentaro Takeda * @operation: Type of operation. 52b69a54eeSKentaro Takeda * 53b69a54eeSKentaro Takeda * Returns the name of single path operation. 54b69a54eeSKentaro Takeda */ 557ef61233STetsuo Handa const char *tomoyo_path2keyword(const u8 operation) 56b69a54eeSKentaro Takeda { 577ef61233STetsuo Handa return (operation < TOMOYO_MAX_PATH_OPERATION) 587ef61233STetsuo Handa ? tomoyo_path_keyword[operation] : NULL; 59b69a54eeSKentaro Takeda } 60b69a54eeSKentaro Takeda 61b69a54eeSKentaro Takeda /** 627ef61233STetsuo Handa * tomoyo_path22keyword - Get the name of double path operation. 63b69a54eeSKentaro Takeda * 64b69a54eeSKentaro Takeda * @operation: Type of operation. 65b69a54eeSKentaro Takeda * 66b69a54eeSKentaro Takeda * Returns the name of double path operation. 67b69a54eeSKentaro Takeda */ 687ef61233STetsuo Handa const char *tomoyo_path22keyword(const u8 operation) 69b69a54eeSKentaro Takeda { 707ef61233STetsuo Handa return (operation < TOMOYO_MAX_PATH2_OPERATION) 717ef61233STetsuo Handa ? tomoyo_path2_keyword[operation] : NULL; 72b69a54eeSKentaro Takeda } 73b69a54eeSKentaro Takeda 74b69a54eeSKentaro Takeda /** 75b69a54eeSKentaro Takeda * tomoyo_strendswith - Check whether the token ends with the given token. 76b69a54eeSKentaro Takeda * 77b69a54eeSKentaro Takeda * @name: The token to check. 78b69a54eeSKentaro Takeda * @tail: The token to find. 79b69a54eeSKentaro Takeda * 80b69a54eeSKentaro Takeda * Returns true if @name ends with @tail, false otherwise. 81b69a54eeSKentaro Takeda */ 82b69a54eeSKentaro Takeda static bool tomoyo_strendswith(const char *name, const char *tail) 83b69a54eeSKentaro Takeda { 84b69a54eeSKentaro Takeda int len; 85b69a54eeSKentaro Takeda 86b69a54eeSKentaro Takeda if (!name || !tail) 87b69a54eeSKentaro Takeda return false; 88b69a54eeSKentaro Takeda len = strlen(name) - strlen(tail); 89b69a54eeSKentaro Takeda return len >= 0 && !strcmp(name + len, tail); 90b69a54eeSKentaro Takeda } 91b69a54eeSKentaro Takeda 92b69a54eeSKentaro Takeda /** 93b69a54eeSKentaro Takeda * tomoyo_get_path - Get realpath. 94b69a54eeSKentaro Takeda * 95b69a54eeSKentaro Takeda * @path: Pointer to "struct path". 96b69a54eeSKentaro Takeda * 97b69a54eeSKentaro Takeda * Returns pointer to "struct tomoyo_path_info" on success, NULL otherwise. 98b69a54eeSKentaro Takeda */ 99b69a54eeSKentaro Takeda static struct tomoyo_path_info *tomoyo_get_path(struct path *path) 100b69a54eeSKentaro Takeda { 101b69a54eeSKentaro Takeda int error; 1028e2d39a1STetsuo Handa struct tomoyo_path_info_with_data *buf = kzalloc(sizeof(*buf), 1038e2d39a1STetsuo Handa GFP_KERNEL); 104b69a54eeSKentaro Takeda 105b69a54eeSKentaro Takeda if (!buf) 106b69a54eeSKentaro Takeda return NULL; 107b69a54eeSKentaro Takeda /* Reserve one byte for appending "/". */ 108b69a54eeSKentaro Takeda error = tomoyo_realpath_from_path2(path, buf->body, 109b69a54eeSKentaro Takeda sizeof(buf->body) - 2); 110b69a54eeSKentaro Takeda if (!error) { 111b69a54eeSKentaro Takeda buf->head.name = buf->body; 112b69a54eeSKentaro Takeda tomoyo_fill_path_info(&buf->head); 113b69a54eeSKentaro Takeda return &buf->head; 114b69a54eeSKentaro Takeda } 1158e2d39a1STetsuo Handa kfree(buf); 116b69a54eeSKentaro Takeda return NULL; 117b69a54eeSKentaro Takeda } 118b69a54eeSKentaro Takeda 1197ef61233STetsuo Handa static int tomoyo_update_path2_acl(const u8 type, const char *filename1, 120b69a54eeSKentaro Takeda const char *filename2, 1217ef61233STetsuo Handa struct tomoyo_domain_info *const domain, 1227ef61233STetsuo Handa const bool is_delete); 1237ef61233STetsuo Handa static int tomoyo_update_path_acl(const u8 type, const char *filename, 1247ef61233STetsuo Handa struct tomoyo_domain_info *const domain, 1257ef61233STetsuo Handa const bool is_delete); 126b69a54eeSKentaro Takeda 127c3fa109aSTetsuo Handa /* 128c3fa109aSTetsuo Handa * tomoyo_globally_readable_list is used for holding list of pathnames which 129c3fa109aSTetsuo Handa * are by default allowed to be open()ed for reading by any process. 130c3fa109aSTetsuo Handa * 131c3fa109aSTetsuo Handa * An entry is added by 132c3fa109aSTetsuo Handa * 133c3fa109aSTetsuo Handa * # echo 'allow_read /lib/libc-2.5.so' > \ 134c3fa109aSTetsuo Handa * /sys/kernel/security/tomoyo/exception_policy 135c3fa109aSTetsuo Handa * 136c3fa109aSTetsuo Handa * and is deleted by 137c3fa109aSTetsuo Handa * 138c3fa109aSTetsuo Handa * # echo 'delete allow_read /lib/libc-2.5.so' > \ 139c3fa109aSTetsuo Handa * /sys/kernel/security/tomoyo/exception_policy 140c3fa109aSTetsuo Handa * 141c3fa109aSTetsuo Handa * and all entries are retrieved by 142c3fa109aSTetsuo Handa * 143c3fa109aSTetsuo Handa * # grep ^allow_read /sys/kernel/security/tomoyo/exception_policy 144c3fa109aSTetsuo Handa * 145c3fa109aSTetsuo Handa * In the example above, any process is allowed to 146c3fa109aSTetsuo Handa * open("/lib/libc-2.5.so", O_RDONLY). 147c3fa109aSTetsuo Handa * One exception is, if the domain which current process belongs to is marked 148c3fa109aSTetsuo Handa * as "ignore_global_allow_read", current process can't do so unless explicitly 149c3fa109aSTetsuo Handa * given "allow_read /lib/libc-2.5.so" to the domain which current process 150c3fa109aSTetsuo Handa * belongs to. 151c3fa109aSTetsuo Handa */ 152847b173eSTetsuo Handa LIST_HEAD(tomoyo_globally_readable_list); 153b69a54eeSKentaro Takeda 154b69a54eeSKentaro Takeda /** 155b69a54eeSKentaro Takeda * tomoyo_update_globally_readable_entry - Update "struct tomoyo_globally_readable_file_entry" list. 156b69a54eeSKentaro Takeda * 157b69a54eeSKentaro Takeda * @filename: Filename unconditionally permitted to open() for reading. 158b69a54eeSKentaro Takeda * @is_delete: True if it is a delete request. 159b69a54eeSKentaro Takeda * 160b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 161fdb8ebb7STetsuo Handa * 162fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 163b69a54eeSKentaro Takeda */ 164b69a54eeSKentaro Takeda static int tomoyo_update_globally_readable_entry(const char *filename, 165b69a54eeSKentaro Takeda const bool is_delete) 166b69a54eeSKentaro Takeda { 167ca0b7df3STetsuo Handa struct tomoyo_globally_readable_file_entry *entry = NULL; 168b69a54eeSKentaro Takeda struct tomoyo_globally_readable_file_entry *ptr; 169b69a54eeSKentaro Takeda const struct tomoyo_path_info *saved_filename; 170ca0b7df3STetsuo Handa int error = is_delete ? -ENOENT : -ENOMEM; 171b69a54eeSKentaro Takeda 17217080008STetsuo Handa if (!tomoyo_is_correct_path(filename, 1, 0, -1)) 173b69a54eeSKentaro Takeda return -EINVAL; 174bf24fb01STetsuo Handa saved_filename = tomoyo_get_name(filename); 175b69a54eeSKentaro Takeda if (!saved_filename) 176b69a54eeSKentaro Takeda return -ENOMEM; 177ca0b7df3STetsuo Handa if (!is_delete) 178ca0b7df3STetsuo Handa entry = kmalloc(sizeof(*entry), GFP_KERNEL); 179f737d95dSTetsuo Handa mutex_lock(&tomoyo_policy_lock); 180fdb8ebb7STetsuo Handa list_for_each_entry_rcu(ptr, &tomoyo_globally_readable_list, list) { 181b69a54eeSKentaro Takeda if (ptr->filename != saved_filename) 182b69a54eeSKentaro Takeda continue; 183b69a54eeSKentaro Takeda ptr->is_deleted = is_delete; 184b69a54eeSKentaro Takeda error = 0; 185ca0b7df3STetsuo Handa break; 186b69a54eeSKentaro Takeda } 187ca0b7df3STetsuo Handa if (!is_delete && error && tomoyo_memory_ok(entry)) { 188ca0b7df3STetsuo Handa entry->filename = saved_filename; 189bf24fb01STetsuo Handa saved_filename = NULL; 190ca0b7df3STetsuo Handa list_add_tail_rcu(&entry->list, &tomoyo_globally_readable_list); 191ca0b7df3STetsuo Handa entry = NULL; 192b69a54eeSKentaro Takeda error = 0; 193ca0b7df3STetsuo Handa } 194f737d95dSTetsuo Handa mutex_unlock(&tomoyo_policy_lock); 195bf24fb01STetsuo Handa tomoyo_put_name(saved_filename); 196ca0b7df3STetsuo Handa kfree(entry); 197b69a54eeSKentaro Takeda return error; 198b69a54eeSKentaro Takeda } 199b69a54eeSKentaro Takeda 200b69a54eeSKentaro Takeda /** 201b69a54eeSKentaro Takeda * tomoyo_is_globally_readable_file - Check if the file is unconditionnaly permitted to be open()ed for reading. 202b69a54eeSKentaro Takeda * 203b69a54eeSKentaro Takeda * @filename: The filename to check. 204b69a54eeSKentaro Takeda * 205b69a54eeSKentaro Takeda * Returns true if any domain can open @filename for reading, false otherwise. 206fdb8ebb7STetsuo Handa * 207fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 208b69a54eeSKentaro Takeda */ 209b69a54eeSKentaro Takeda static bool tomoyo_is_globally_readable_file(const struct tomoyo_path_info * 210b69a54eeSKentaro Takeda filename) 211b69a54eeSKentaro Takeda { 212b69a54eeSKentaro Takeda struct tomoyo_globally_readable_file_entry *ptr; 213b69a54eeSKentaro Takeda bool found = false; 214fdb8ebb7STetsuo Handa 215fdb8ebb7STetsuo Handa list_for_each_entry_rcu(ptr, &tomoyo_globally_readable_list, list) { 216b69a54eeSKentaro Takeda if (!ptr->is_deleted && 217b69a54eeSKentaro Takeda tomoyo_path_matches_pattern(filename, ptr->filename)) { 218b69a54eeSKentaro Takeda found = true; 219b69a54eeSKentaro Takeda break; 220b69a54eeSKentaro Takeda } 221b69a54eeSKentaro Takeda } 222b69a54eeSKentaro Takeda return found; 223b69a54eeSKentaro Takeda } 224b69a54eeSKentaro Takeda 225b69a54eeSKentaro Takeda /** 226b69a54eeSKentaro Takeda * tomoyo_write_globally_readable_policy - Write "struct tomoyo_globally_readable_file_entry" list. 227b69a54eeSKentaro Takeda * 228b69a54eeSKentaro Takeda * @data: String to parse. 229b69a54eeSKentaro Takeda * @is_delete: True if it is a delete request. 230b69a54eeSKentaro Takeda * 231b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 232fdb8ebb7STetsuo Handa * 233fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 234b69a54eeSKentaro Takeda */ 235b69a54eeSKentaro Takeda int tomoyo_write_globally_readable_policy(char *data, const bool is_delete) 236b69a54eeSKentaro Takeda { 237b69a54eeSKentaro Takeda return tomoyo_update_globally_readable_entry(data, is_delete); 238b69a54eeSKentaro Takeda } 239b69a54eeSKentaro Takeda 240b69a54eeSKentaro Takeda /** 241b69a54eeSKentaro Takeda * tomoyo_read_globally_readable_policy - Read "struct tomoyo_globally_readable_file_entry" list. 242b69a54eeSKentaro Takeda * 243b69a54eeSKentaro Takeda * @head: Pointer to "struct tomoyo_io_buffer". 244b69a54eeSKentaro Takeda * 245b69a54eeSKentaro Takeda * Returns true on success, false otherwise. 246fdb8ebb7STetsuo Handa * 247fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 248b69a54eeSKentaro Takeda */ 249b69a54eeSKentaro Takeda bool tomoyo_read_globally_readable_policy(struct tomoyo_io_buffer *head) 250b69a54eeSKentaro Takeda { 251b69a54eeSKentaro Takeda struct list_head *pos; 252b69a54eeSKentaro Takeda bool done = true; 253b69a54eeSKentaro Takeda 254b69a54eeSKentaro Takeda list_for_each_cookie(pos, head->read_var2, 255b69a54eeSKentaro Takeda &tomoyo_globally_readable_list) { 256b69a54eeSKentaro Takeda struct tomoyo_globally_readable_file_entry *ptr; 257b69a54eeSKentaro Takeda ptr = list_entry(pos, 258b69a54eeSKentaro Takeda struct tomoyo_globally_readable_file_entry, 259b69a54eeSKentaro Takeda list); 260b69a54eeSKentaro Takeda if (ptr->is_deleted) 261b69a54eeSKentaro Takeda continue; 2627d2948b1STetsuo Handa done = tomoyo_io_printf(head, TOMOYO_KEYWORD_ALLOW_READ "%s\n", 2637d2948b1STetsuo Handa ptr->filename->name); 2647d2948b1STetsuo Handa if (!done) 265b69a54eeSKentaro Takeda break; 266b69a54eeSKentaro Takeda } 267b69a54eeSKentaro Takeda return done; 268b69a54eeSKentaro Takeda } 269b69a54eeSKentaro Takeda 270c3fa109aSTetsuo Handa /* tomoyo_pattern_list is used for holding list of pathnames which are used for 271c3fa109aSTetsuo Handa * converting pathnames to pathname patterns during learning mode. 272c3fa109aSTetsuo Handa * 273c3fa109aSTetsuo Handa * An entry is added by 274c3fa109aSTetsuo Handa * 275c3fa109aSTetsuo Handa * # echo 'file_pattern /proc/\$/mounts' > \ 276c3fa109aSTetsuo Handa * /sys/kernel/security/tomoyo/exception_policy 277c3fa109aSTetsuo Handa * 278c3fa109aSTetsuo Handa * and is deleted by 279c3fa109aSTetsuo Handa * 280c3fa109aSTetsuo Handa * # echo 'delete file_pattern /proc/\$/mounts' > \ 281c3fa109aSTetsuo Handa * /sys/kernel/security/tomoyo/exception_policy 282c3fa109aSTetsuo Handa * 283c3fa109aSTetsuo Handa * and all entries are retrieved by 284c3fa109aSTetsuo Handa * 285c3fa109aSTetsuo Handa * # grep ^file_pattern /sys/kernel/security/tomoyo/exception_policy 286c3fa109aSTetsuo Handa * 287c3fa109aSTetsuo Handa * In the example above, if a process which belongs to a domain which is in 288c3fa109aSTetsuo Handa * learning mode requested open("/proc/1/mounts", O_RDONLY), 289c3fa109aSTetsuo Handa * "allow_read /proc/\$/mounts" is automatically added to the domain which that 290c3fa109aSTetsuo Handa * process belongs to. 291c3fa109aSTetsuo Handa * 292c3fa109aSTetsuo Handa * It is not a desirable behavior that we have to use /proc/\$/ instead of 293c3fa109aSTetsuo Handa * /proc/self/ when current process needs to access only current process's 294c3fa109aSTetsuo Handa * information. As of now, LSM version of TOMOYO is using __d_path() for 295c3fa109aSTetsuo Handa * calculating pathname. Non LSM version of TOMOYO is using its own function 296c3fa109aSTetsuo Handa * which pretends as if /proc/self/ is not a symlink; so that we can forbid 297c3fa109aSTetsuo Handa * current process from accessing other process's information. 298c3fa109aSTetsuo Handa */ 299847b173eSTetsuo Handa LIST_HEAD(tomoyo_pattern_list); 300b69a54eeSKentaro Takeda 301b69a54eeSKentaro Takeda /** 302b69a54eeSKentaro Takeda * tomoyo_update_file_pattern_entry - Update "struct tomoyo_pattern_entry" list. 303b69a54eeSKentaro Takeda * 304b69a54eeSKentaro Takeda * @pattern: Pathname pattern. 305b69a54eeSKentaro Takeda * @is_delete: True if it is a delete request. 306b69a54eeSKentaro Takeda * 307b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 308fdb8ebb7STetsuo Handa * 309fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 310b69a54eeSKentaro Takeda */ 311b69a54eeSKentaro Takeda static int tomoyo_update_file_pattern_entry(const char *pattern, 312b69a54eeSKentaro Takeda const bool is_delete) 313b69a54eeSKentaro Takeda { 314ca0b7df3STetsuo Handa struct tomoyo_pattern_entry *entry = NULL; 315b69a54eeSKentaro Takeda struct tomoyo_pattern_entry *ptr; 316b69a54eeSKentaro Takeda const struct tomoyo_path_info *saved_pattern; 317ca0b7df3STetsuo Handa int error = is_delete ? -ENOENT : -ENOMEM; 318b69a54eeSKentaro Takeda 319bf24fb01STetsuo Handa saved_pattern = tomoyo_get_name(pattern); 320b69a54eeSKentaro Takeda if (!saved_pattern) 321ca0b7df3STetsuo Handa return error; 322ca0b7df3STetsuo Handa if (!saved_pattern->is_patterned) 323ca0b7df3STetsuo Handa goto out; 324ca0b7df3STetsuo Handa if (!is_delete) 325ca0b7df3STetsuo Handa entry = kmalloc(sizeof(*entry), GFP_KERNEL); 326f737d95dSTetsuo Handa mutex_lock(&tomoyo_policy_lock); 327fdb8ebb7STetsuo Handa list_for_each_entry_rcu(ptr, &tomoyo_pattern_list, list) { 328b69a54eeSKentaro Takeda if (saved_pattern != ptr->pattern) 329b69a54eeSKentaro Takeda continue; 330b69a54eeSKentaro Takeda ptr->is_deleted = is_delete; 331b69a54eeSKentaro Takeda error = 0; 332ca0b7df3STetsuo Handa break; 333b69a54eeSKentaro Takeda } 334ca0b7df3STetsuo Handa if (!is_delete && error && tomoyo_memory_ok(entry)) { 335ca0b7df3STetsuo Handa entry->pattern = saved_pattern; 336bf24fb01STetsuo Handa saved_pattern = NULL; 337ca0b7df3STetsuo Handa list_add_tail_rcu(&entry->list, &tomoyo_pattern_list); 338ca0b7df3STetsuo Handa entry = NULL; 339b69a54eeSKentaro Takeda error = 0; 340ca0b7df3STetsuo Handa } 341f737d95dSTetsuo Handa mutex_unlock(&tomoyo_policy_lock); 342ca0b7df3STetsuo Handa out: 343ca0b7df3STetsuo Handa kfree(entry); 344bf24fb01STetsuo Handa tomoyo_put_name(saved_pattern); 345b69a54eeSKentaro Takeda return error; 346b69a54eeSKentaro Takeda } 347b69a54eeSKentaro Takeda 348b69a54eeSKentaro Takeda /** 349b69a54eeSKentaro Takeda * tomoyo_get_file_pattern - Get patterned pathname. 350b69a54eeSKentaro Takeda * 351b69a54eeSKentaro Takeda * @filename: The filename to find patterned pathname. 352b69a54eeSKentaro Takeda * 353b69a54eeSKentaro Takeda * Returns pointer to pathname pattern if matched, @filename otherwise. 354fdb8ebb7STetsuo Handa * 355fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 356b69a54eeSKentaro Takeda */ 357b69a54eeSKentaro Takeda static const struct tomoyo_path_info * 358b69a54eeSKentaro Takeda tomoyo_get_file_pattern(const struct tomoyo_path_info *filename) 359b69a54eeSKentaro Takeda { 360b69a54eeSKentaro Takeda struct tomoyo_pattern_entry *ptr; 361b69a54eeSKentaro Takeda const struct tomoyo_path_info *pattern = NULL; 362b69a54eeSKentaro Takeda 363fdb8ebb7STetsuo Handa list_for_each_entry_rcu(ptr, &tomoyo_pattern_list, list) { 364b69a54eeSKentaro Takeda if (ptr->is_deleted) 365b69a54eeSKentaro Takeda continue; 366b69a54eeSKentaro Takeda if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) 367b69a54eeSKentaro Takeda continue; 368b69a54eeSKentaro Takeda pattern = ptr->pattern; 369b69a54eeSKentaro Takeda if (tomoyo_strendswith(pattern->name, "/\\*")) { 370b69a54eeSKentaro Takeda /* Do nothing. Try to find the better match. */ 371b69a54eeSKentaro Takeda } else { 372b69a54eeSKentaro Takeda /* This would be the better match. Use this. */ 373b69a54eeSKentaro Takeda break; 374b69a54eeSKentaro Takeda } 375b69a54eeSKentaro Takeda } 376b69a54eeSKentaro Takeda if (pattern) 377b69a54eeSKentaro Takeda filename = pattern; 378b69a54eeSKentaro Takeda return filename; 379b69a54eeSKentaro Takeda } 380b69a54eeSKentaro Takeda 381b69a54eeSKentaro Takeda /** 382b69a54eeSKentaro Takeda * tomoyo_write_pattern_policy - Write "struct tomoyo_pattern_entry" list. 383b69a54eeSKentaro Takeda * 384b69a54eeSKentaro Takeda * @data: String to parse. 385b69a54eeSKentaro Takeda * @is_delete: True if it is a delete request. 386b69a54eeSKentaro Takeda * 387b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 388fdb8ebb7STetsuo Handa * 389fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 390b69a54eeSKentaro Takeda */ 391b69a54eeSKentaro Takeda int tomoyo_write_pattern_policy(char *data, const bool is_delete) 392b69a54eeSKentaro Takeda { 393b69a54eeSKentaro Takeda return tomoyo_update_file_pattern_entry(data, is_delete); 394b69a54eeSKentaro Takeda } 395b69a54eeSKentaro Takeda 396b69a54eeSKentaro Takeda /** 397b69a54eeSKentaro Takeda * tomoyo_read_file_pattern - Read "struct tomoyo_pattern_entry" list. 398b69a54eeSKentaro Takeda * 399b69a54eeSKentaro Takeda * @head: Pointer to "struct tomoyo_io_buffer". 400b69a54eeSKentaro Takeda * 401b69a54eeSKentaro Takeda * Returns true on success, false otherwise. 402fdb8ebb7STetsuo Handa * 403fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 404b69a54eeSKentaro Takeda */ 405b69a54eeSKentaro Takeda bool tomoyo_read_file_pattern(struct tomoyo_io_buffer *head) 406b69a54eeSKentaro Takeda { 407b69a54eeSKentaro Takeda struct list_head *pos; 408b69a54eeSKentaro Takeda bool done = true; 409b69a54eeSKentaro Takeda 410b69a54eeSKentaro Takeda list_for_each_cookie(pos, head->read_var2, &tomoyo_pattern_list) { 411b69a54eeSKentaro Takeda struct tomoyo_pattern_entry *ptr; 412b69a54eeSKentaro Takeda ptr = list_entry(pos, struct tomoyo_pattern_entry, list); 413b69a54eeSKentaro Takeda if (ptr->is_deleted) 414b69a54eeSKentaro Takeda continue; 4157d2948b1STetsuo Handa done = tomoyo_io_printf(head, TOMOYO_KEYWORD_FILE_PATTERN 4167d2948b1STetsuo Handa "%s\n", ptr->pattern->name); 4177d2948b1STetsuo Handa if (!done) 418b69a54eeSKentaro Takeda break; 419b69a54eeSKentaro Takeda } 420b69a54eeSKentaro Takeda return done; 421b69a54eeSKentaro Takeda } 422b69a54eeSKentaro Takeda 423c3fa109aSTetsuo Handa /* 424c3fa109aSTetsuo Handa * tomoyo_no_rewrite_list is used for holding list of pathnames which are by 425c3fa109aSTetsuo Handa * default forbidden to modify already written content of a file. 426c3fa109aSTetsuo Handa * 427c3fa109aSTetsuo Handa * An entry is added by 428c3fa109aSTetsuo Handa * 429c3fa109aSTetsuo Handa * # echo 'deny_rewrite /var/log/messages' > \ 430c3fa109aSTetsuo Handa * /sys/kernel/security/tomoyo/exception_policy 431c3fa109aSTetsuo Handa * 432c3fa109aSTetsuo Handa * and is deleted by 433c3fa109aSTetsuo Handa * 434c3fa109aSTetsuo Handa * # echo 'delete deny_rewrite /var/log/messages' > \ 435c3fa109aSTetsuo Handa * /sys/kernel/security/tomoyo/exception_policy 436c3fa109aSTetsuo Handa * 437c3fa109aSTetsuo Handa * and all entries are retrieved by 438c3fa109aSTetsuo Handa * 439c3fa109aSTetsuo Handa * # grep ^deny_rewrite /sys/kernel/security/tomoyo/exception_policy 440c3fa109aSTetsuo Handa * 441c3fa109aSTetsuo Handa * In the example above, if a process requested to rewrite /var/log/messages , 442c3fa109aSTetsuo Handa * the process can't rewrite unless the domain which that process belongs to 443c3fa109aSTetsuo Handa * has "allow_rewrite /var/log/messages" entry. 444c3fa109aSTetsuo Handa * 445c3fa109aSTetsuo Handa * It is not a desirable behavior that we have to add "\040(deleted)" suffix 446c3fa109aSTetsuo Handa * when we want to allow rewriting already unlink()ed file. As of now, 447c3fa109aSTetsuo Handa * LSM version of TOMOYO is using __d_path() for calculating pathname. 448c3fa109aSTetsuo Handa * Non LSM version of TOMOYO is using its own function which doesn't append 449c3fa109aSTetsuo Handa * " (deleted)" suffix if the file is already unlink()ed; so that we don't 450c3fa109aSTetsuo Handa * need to worry whether the file is already unlink()ed or not. 451c3fa109aSTetsuo Handa */ 452847b173eSTetsuo Handa LIST_HEAD(tomoyo_no_rewrite_list); 453b69a54eeSKentaro Takeda 454b69a54eeSKentaro Takeda /** 455b69a54eeSKentaro Takeda * tomoyo_update_no_rewrite_entry - Update "struct tomoyo_no_rewrite_entry" list. 456b69a54eeSKentaro Takeda * 457b69a54eeSKentaro Takeda * @pattern: Pathname pattern that are not rewritable by default. 458b69a54eeSKentaro Takeda * @is_delete: True if it is a delete request. 459b69a54eeSKentaro Takeda * 460b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 461fdb8ebb7STetsuo Handa * 462fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 463b69a54eeSKentaro Takeda */ 464b69a54eeSKentaro Takeda static int tomoyo_update_no_rewrite_entry(const char *pattern, 465b69a54eeSKentaro Takeda const bool is_delete) 466b69a54eeSKentaro Takeda { 467ca0b7df3STetsuo Handa struct tomoyo_no_rewrite_entry *entry = NULL; 468ca0b7df3STetsuo Handa struct tomoyo_no_rewrite_entry *ptr; 469b69a54eeSKentaro Takeda const struct tomoyo_path_info *saved_pattern; 470ca0b7df3STetsuo Handa int error = is_delete ? -ENOENT : -ENOMEM; 471b69a54eeSKentaro Takeda 47217080008STetsuo Handa if (!tomoyo_is_correct_path(pattern, 0, 0, 0)) 473b69a54eeSKentaro Takeda return -EINVAL; 474bf24fb01STetsuo Handa saved_pattern = tomoyo_get_name(pattern); 475b69a54eeSKentaro Takeda if (!saved_pattern) 476ca0b7df3STetsuo Handa return error; 477ca0b7df3STetsuo Handa if (!is_delete) 478ca0b7df3STetsuo Handa entry = kmalloc(sizeof(*entry), GFP_KERNEL); 479f737d95dSTetsuo Handa mutex_lock(&tomoyo_policy_lock); 480fdb8ebb7STetsuo Handa list_for_each_entry_rcu(ptr, &tomoyo_no_rewrite_list, list) { 481b69a54eeSKentaro Takeda if (ptr->pattern != saved_pattern) 482b69a54eeSKentaro Takeda continue; 483b69a54eeSKentaro Takeda ptr->is_deleted = is_delete; 484b69a54eeSKentaro Takeda error = 0; 485ca0b7df3STetsuo Handa break; 486b69a54eeSKentaro Takeda } 487ca0b7df3STetsuo Handa if (!is_delete && error && tomoyo_memory_ok(entry)) { 488ca0b7df3STetsuo Handa entry->pattern = saved_pattern; 489bf24fb01STetsuo Handa saved_pattern = NULL; 490ca0b7df3STetsuo Handa list_add_tail_rcu(&entry->list, &tomoyo_no_rewrite_list); 491ca0b7df3STetsuo Handa entry = NULL; 492b69a54eeSKentaro Takeda error = 0; 493ca0b7df3STetsuo Handa } 494f737d95dSTetsuo Handa mutex_unlock(&tomoyo_policy_lock); 495bf24fb01STetsuo Handa tomoyo_put_name(saved_pattern); 496ca0b7df3STetsuo Handa kfree(entry); 497b69a54eeSKentaro Takeda return error; 498b69a54eeSKentaro Takeda } 499b69a54eeSKentaro Takeda 500b69a54eeSKentaro Takeda /** 501b69a54eeSKentaro Takeda * tomoyo_is_no_rewrite_file - Check if the given pathname is not permitted to be rewrited. 502b69a54eeSKentaro Takeda * 503b69a54eeSKentaro Takeda * @filename: Filename to check. 504b69a54eeSKentaro Takeda * 505b69a54eeSKentaro Takeda * Returns true if @filename is specified by "deny_rewrite" directive, 506b69a54eeSKentaro Takeda * false otherwise. 507fdb8ebb7STetsuo Handa * 508fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 509b69a54eeSKentaro Takeda */ 510b69a54eeSKentaro Takeda static bool tomoyo_is_no_rewrite_file(const struct tomoyo_path_info *filename) 511b69a54eeSKentaro Takeda { 512b69a54eeSKentaro Takeda struct tomoyo_no_rewrite_entry *ptr; 513b69a54eeSKentaro Takeda bool found = false; 514b69a54eeSKentaro Takeda 515fdb8ebb7STetsuo Handa list_for_each_entry_rcu(ptr, &tomoyo_no_rewrite_list, list) { 516b69a54eeSKentaro Takeda if (ptr->is_deleted) 517b69a54eeSKentaro Takeda continue; 518b69a54eeSKentaro Takeda if (!tomoyo_path_matches_pattern(filename, ptr->pattern)) 519b69a54eeSKentaro Takeda continue; 520b69a54eeSKentaro Takeda found = true; 521b69a54eeSKentaro Takeda break; 522b69a54eeSKentaro Takeda } 523b69a54eeSKentaro Takeda return found; 524b69a54eeSKentaro Takeda } 525b69a54eeSKentaro Takeda 526b69a54eeSKentaro Takeda /** 527b69a54eeSKentaro Takeda * tomoyo_write_no_rewrite_policy - Write "struct tomoyo_no_rewrite_entry" list. 528b69a54eeSKentaro Takeda * 529b69a54eeSKentaro Takeda * @data: String to parse. 530b69a54eeSKentaro Takeda * @is_delete: True if it is a delete request. 531b69a54eeSKentaro Takeda * 532b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 533fdb8ebb7STetsuo Handa * 534fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 535b69a54eeSKentaro Takeda */ 536b69a54eeSKentaro Takeda int tomoyo_write_no_rewrite_policy(char *data, const bool is_delete) 537b69a54eeSKentaro Takeda { 538b69a54eeSKentaro Takeda return tomoyo_update_no_rewrite_entry(data, is_delete); 539b69a54eeSKentaro Takeda } 540b69a54eeSKentaro Takeda 541b69a54eeSKentaro Takeda /** 542b69a54eeSKentaro Takeda * tomoyo_read_no_rewrite_policy - Read "struct tomoyo_no_rewrite_entry" list. 543b69a54eeSKentaro Takeda * 544b69a54eeSKentaro Takeda * @head: Pointer to "struct tomoyo_io_buffer". 545b69a54eeSKentaro Takeda * 546b69a54eeSKentaro Takeda * Returns true on success, false otherwise. 547fdb8ebb7STetsuo Handa * 548fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 549b69a54eeSKentaro Takeda */ 550b69a54eeSKentaro Takeda bool tomoyo_read_no_rewrite_policy(struct tomoyo_io_buffer *head) 551b69a54eeSKentaro Takeda { 552b69a54eeSKentaro Takeda struct list_head *pos; 553b69a54eeSKentaro Takeda bool done = true; 554b69a54eeSKentaro Takeda 555b69a54eeSKentaro Takeda list_for_each_cookie(pos, head->read_var2, &tomoyo_no_rewrite_list) { 556b69a54eeSKentaro Takeda struct tomoyo_no_rewrite_entry *ptr; 557b69a54eeSKentaro Takeda ptr = list_entry(pos, struct tomoyo_no_rewrite_entry, list); 558b69a54eeSKentaro Takeda if (ptr->is_deleted) 559b69a54eeSKentaro Takeda continue; 5607d2948b1STetsuo Handa done = tomoyo_io_printf(head, TOMOYO_KEYWORD_DENY_REWRITE 5617d2948b1STetsuo Handa "%s\n", ptr->pattern->name); 5627d2948b1STetsuo Handa if (!done) 563b69a54eeSKentaro Takeda break; 564b69a54eeSKentaro Takeda } 565b69a54eeSKentaro Takeda return done; 566b69a54eeSKentaro Takeda } 567b69a54eeSKentaro Takeda 568b69a54eeSKentaro Takeda /** 569b69a54eeSKentaro Takeda * tomoyo_update_file_acl - Update file's read/write/execute ACL. 570b69a54eeSKentaro Takeda * 571b69a54eeSKentaro Takeda * @filename: Filename. 572b69a54eeSKentaro Takeda * @perm: Permission (between 1 to 7). 573b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 574b69a54eeSKentaro Takeda * @is_delete: True if it is a delete request. 575b69a54eeSKentaro Takeda * 576b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 577b69a54eeSKentaro Takeda * 578b69a54eeSKentaro Takeda * This is legacy support interface for older policy syntax. 579b69a54eeSKentaro Takeda * Current policy syntax uses "allow_read/write" instead of "6", 580b69a54eeSKentaro Takeda * "allow_read" instead of "4", "allow_write" instead of "2", 581b69a54eeSKentaro Takeda * "allow_execute" instead of "1". 582fdb8ebb7STetsuo Handa * 583fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 584b69a54eeSKentaro Takeda */ 585b69a54eeSKentaro Takeda static int tomoyo_update_file_acl(const char *filename, u8 perm, 586b69a54eeSKentaro Takeda struct tomoyo_domain_info * const domain, 587b69a54eeSKentaro Takeda const bool is_delete) 588b69a54eeSKentaro Takeda { 589b69a54eeSKentaro Takeda if (perm > 7 || !perm) { 590b69a54eeSKentaro Takeda printk(KERN_DEBUG "%s: Invalid permission '%d %s'\n", 591b69a54eeSKentaro Takeda __func__, perm, filename); 592b69a54eeSKentaro Takeda return -EINVAL; 593b69a54eeSKentaro Takeda } 594b69a54eeSKentaro Takeda if (filename[0] != '@' && tomoyo_strendswith(filename, "/")) 595b69a54eeSKentaro Takeda /* 596b69a54eeSKentaro Takeda * Only 'allow_mkdir' and 'allow_rmdir' are valid for 597b69a54eeSKentaro Takeda * directory permissions. 598b69a54eeSKentaro Takeda */ 599b69a54eeSKentaro Takeda return 0; 600b69a54eeSKentaro Takeda if (perm & 4) 6017ef61233STetsuo Handa tomoyo_update_path_acl(TOMOYO_TYPE_READ, filename, domain, 6027ef61233STetsuo Handa is_delete); 603b69a54eeSKentaro Takeda if (perm & 2) 6047ef61233STetsuo Handa tomoyo_update_path_acl(TOMOYO_TYPE_WRITE, filename, domain, 6057ef61233STetsuo Handa is_delete); 606b69a54eeSKentaro Takeda if (perm & 1) 6077ef61233STetsuo Handa tomoyo_update_path_acl(TOMOYO_TYPE_EXECUTE, filename, domain, 6087ef61233STetsuo Handa is_delete); 609b69a54eeSKentaro Takeda return 0; 610b69a54eeSKentaro Takeda } 611b69a54eeSKentaro Takeda 612b69a54eeSKentaro Takeda /** 6137ef61233STetsuo Handa * tomoyo_path_acl2 - Check permission for single path operation. 614b69a54eeSKentaro Takeda * 615b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 616b69a54eeSKentaro Takeda * @filename: Filename to check. 617b69a54eeSKentaro Takeda * @perm: Permission. 618b69a54eeSKentaro Takeda * @may_use_pattern: True if patterned ACL is permitted. 619b69a54eeSKentaro Takeda * 620b69a54eeSKentaro Takeda * Returns 0 on success, -EPERM otherwise. 621fdb8ebb7STetsuo Handa * 622fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 623b69a54eeSKentaro Takeda */ 6247ef61233STetsuo Handa static int tomoyo_path_acl2(const struct tomoyo_domain_info *domain, 6257ef61233STetsuo Handa const struct tomoyo_path_info *filename, 6267ef61233STetsuo Handa const u32 perm, const bool may_use_pattern) 627b69a54eeSKentaro Takeda { 628b69a54eeSKentaro Takeda struct tomoyo_acl_info *ptr; 629b69a54eeSKentaro Takeda int error = -EPERM; 630b69a54eeSKentaro Takeda 631fdb8ebb7STetsuo Handa list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { 6327ef61233STetsuo Handa struct tomoyo_path_acl *acl; 6337ef61233STetsuo Handa if (ptr->type != TOMOYO_TYPE_PATH_ACL) 634b69a54eeSKentaro Takeda continue; 6357ef61233STetsuo Handa acl = container_of(ptr, struct tomoyo_path_acl, head); 636937bf613STetsuo Handa if (perm <= 0xFFFF) { 637b69a54eeSKentaro Takeda if (!(acl->perm & perm)) 638b69a54eeSKentaro Takeda continue; 639937bf613STetsuo Handa } else { 640937bf613STetsuo Handa if (!(acl->perm_high & (perm >> 16))) 641937bf613STetsuo Handa continue; 642937bf613STetsuo Handa } 643b69a54eeSKentaro Takeda if (may_use_pattern || !acl->filename->is_patterned) { 644b69a54eeSKentaro Takeda if (!tomoyo_path_matches_pattern(filename, 645b69a54eeSKentaro Takeda acl->filename)) 646b69a54eeSKentaro Takeda continue; 647b69a54eeSKentaro Takeda } else { 648b69a54eeSKentaro Takeda continue; 649b69a54eeSKentaro Takeda } 650b69a54eeSKentaro Takeda error = 0; 651b69a54eeSKentaro Takeda break; 652b69a54eeSKentaro Takeda } 653b69a54eeSKentaro Takeda return error; 654b69a54eeSKentaro Takeda } 655b69a54eeSKentaro Takeda 656b69a54eeSKentaro Takeda /** 657b69a54eeSKentaro Takeda * tomoyo_check_file_acl - Check permission for opening files. 658b69a54eeSKentaro Takeda * 659b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 660b69a54eeSKentaro Takeda * @filename: Filename to check. 661b69a54eeSKentaro Takeda * @operation: Mode ("read" or "write" or "read/write" or "execute"). 662b69a54eeSKentaro Takeda * 663b69a54eeSKentaro Takeda * Returns 0 on success, -EPERM otherwise. 664fdb8ebb7STetsuo Handa * 665fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 666b69a54eeSKentaro Takeda */ 667b69a54eeSKentaro Takeda static int tomoyo_check_file_acl(const struct tomoyo_domain_info *domain, 668b69a54eeSKentaro Takeda const struct tomoyo_path_info *filename, 669b69a54eeSKentaro Takeda const u8 operation) 670b69a54eeSKentaro Takeda { 671937bf613STetsuo Handa u32 perm = 0; 672b69a54eeSKentaro Takeda 673b69a54eeSKentaro Takeda if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE)) 674b69a54eeSKentaro Takeda return 0; 675b69a54eeSKentaro Takeda if (operation == 6) 6767ef61233STetsuo Handa perm = 1 << TOMOYO_TYPE_READ_WRITE; 677b69a54eeSKentaro Takeda else if (operation == 4) 6787ef61233STetsuo Handa perm = 1 << TOMOYO_TYPE_READ; 679b69a54eeSKentaro Takeda else if (operation == 2) 6807ef61233STetsuo Handa perm = 1 << TOMOYO_TYPE_WRITE; 681b69a54eeSKentaro Takeda else if (operation == 1) 6827ef61233STetsuo Handa perm = 1 << TOMOYO_TYPE_EXECUTE; 683b69a54eeSKentaro Takeda else 684b69a54eeSKentaro Takeda BUG(); 6857ef61233STetsuo Handa return tomoyo_path_acl2(domain, filename, perm, operation != 1); 686b69a54eeSKentaro Takeda } 687b69a54eeSKentaro Takeda 688b69a54eeSKentaro Takeda /** 689b69a54eeSKentaro Takeda * tomoyo_check_file_perm2 - Check permission for opening files. 690b69a54eeSKentaro Takeda * 691b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 692b69a54eeSKentaro Takeda * @filename: Filename to check. 693b69a54eeSKentaro Takeda * @perm: Mode ("read" or "write" or "read/write" or "execute"). 694b69a54eeSKentaro Takeda * @operation: Operation name passed used for verbose mode. 695b69a54eeSKentaro Takeda * @mode: Access control mode. 696b69a54eeSKentaro Takeda * 697b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 698fdb8ebb7STetsuo Handa * 699fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 700b69a54eeSKentaro Takeda */ 701b69a54eeSKentaro Takeda static int tomoyo_check_file_perm2(struct tomoyo_domain_info * const domain, 702b69a54eeSKentaro Takeda const struct tomoyo_path_info *filename, 703b69a54eeSKentaro Takeda const u8 perm, const char *operation, 704b69a54eeSKentaro Takeda const u8 mode) 705b69a54eeSKentaro Takeda { 706b69a54eeSKentaro Takeda const bool is_enforce = (mode == 3); 707b69a54eeSKentaro Takeda const char *msg = "<unknown>"; 708b69a54eeSKentaro Takeda int error = 0; 709b69a54eeSKentaro Takeda 710b69a54eeSKentaro Takeda if (!filename) 711b69a54eeSKentaro Takeda return 0; 712b69a54eeSKentaro Takeda error = tomoyo_check_file_acl(domain, filename, perm); 713ea13ddbaSTetsuo Handa if (error && perm == 4 && !domain->ignore_global_allow_read 714b69a54eeSKentaro Takeda && tomoyo_is_globally_readable_file(filename)) 715b69a54eeSKentaro Takeda error = 0; 716b69a54eeSKentaro Takeda if (perm == 6) 7177ef61233STetsuo Handa msg = tomoyo_path2keyword(TOMOYO_TYPE_READ_WRITE); 718b69a54eeSKentaro Takeda else if (perm == 4) 7197ef61233STetsuo Handa msg = tomoyo_path2keyword(TOMOYO_TYPE_READ); 720b69a54eeSKentaro Takeda else if (perm == 2) 7217ef61233STetsuo Handa msg = tomoyo_path2keyword(TOMOYO_TYPE_WRITE); 722b69a54eeSKentaro Takeda else if (perm == 1) 7237ef61233STetsuo Handa msg = tomoyo_path2keyword(TOMOYO_TYPE_EXECUTE); 724b69a54eeSKentaro Takeda else 725b69a54eeSKentaro Takeda BUG(); 726b69a54eeSKentaro Takeda if (!error) 727b69a54eeSKentaro Takeda return 0; 728b69a54eeSKentaro Takeda if (tomoyo_verbose_mode(domain)) 729b69a54eeSKentaro Takeda printk(KERN_WARNING "TOMOYO-%s: Access '%s(%s) %s' denied " 730b69a54eeSKentaro Takeda "for %s\n", tomoyo_get_msg(is_enforce), msg, operation, 731b69a54eeSKentaro Takeda filename->name, tomoyo_get_last_name(domain)); 732b69a54eeSKentaro Takeda if (is_enforce) 733b69a54eeSKentaro Takeda return error; 734b69a54eeSKentaro Takeda if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) { 735b69a54eeSKentaro Takeda /* Don't use patterns for execute permission. */ 736b69a54eeSKentaro Takeda const struct tomoyo_path_info *patterned_file = (perm != 1) ? 737b69a54eeSKentaro Takeda tomoyo_get_file_pattern(filename) : filename; 738b69a54eeSKentaro Takeda tomoyo_update_file_acl(patterned_file->name, perm, 739b69a54eeSKentaro Takeda domain, false); 740b69a54eeSKentaro Takeda } 741b69a54eeSKentaro Takeda return 0; 742b69a54eeSKentaro Takeda } 743b69a54eeSKentaro Takeda 744b69a54eeSKentaro Takeda /** 745b69a54eeSKentaro Takeda * tomoyo_write_file_policy - Update file related list. 746b69a54eeSKentaro Takeda * 747b69a54eeSKentaro Takeda * @data: String to parse. 748b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 749b69a54eeSKentaro Takeda * @is_delete: True if it is a delete request. 750b69a54eeSKentaro Takeda * 751b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 752fdb8ebb7STetsuo Handa * 753fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 754b69a54eeSKentaro Takeda */ 755b69a54eeSKentaro Takeda int tomoyo_write_file_policy(char *data, struct tomoyo_domain_info *domain, 756b69a54eeSKentaro Takeda const bool is_delete) 757b69a54eeSKentaro Takeda { 758b69a54eeSKentaro Takeda char *filename = strchr(data, ' '); 759b69a54eeSKentaro Takeda char *filename2; 760b69a54eeSKentaro Takeda unsigned int perm; 761b69a54eeSKentaro Takeda u8 type; 762b69a54eeSKentaro Takeda 763b69a54eeSKentaro Takeda if (!filename) 764b69a54eeSKentaro Takeda return -EINVAL; 765b69a54eeSKentaro Takeda *filename++ = '\0'; 766b69a54eeSKentaro Takeda if (sscanf(data, "%u", &perm) == 1) 767b69a54eeSKentaro Takeda return tomoyo_update_file_acl(filename, (u8) perm, domain, 768b69a54eeSKentaro Takeda is_delete); 769b69a54eeSKentaro Takeda if (strncmp(data, "allow_", 6)) 770b69a54eeSKentaro Takeda goto out; 771b69a54eeSKentaro Takeda data += 6; 7727ef61233STetsuo Handa for (type = 0; type < TOMOYO_MAX_PATH_OPERATION; type++) { 7737ef61233STetsuo Handa if (strcmp(data, tomoyo_path_keyword[type])) 774b69a54eeSKentaro Takeda continue; 7757ef61233STetsuo Handa return tomoyo_update_path_acl(type, filename, domain, 7767ef61233STetsuo Handa is_delete); 777b69a54eeSKentaro Takeda } 778b69a54eeSKentaro Takeda filename2 = strchr(filename, ' '); 779b69a54eeSKentaro Takeda if (!filename2) 780b69a54eeSKentaro Takeda goto out; 781b69a54eeSKentaro Takeda *filename2++ = '\0'; 7827ef61233STetsuo Handa for (type = 0; type < TOMOYO_MAX_PATH2_OPERATION; type++) { 7837ef61233STetsuo Handa if (strcmp(data, tomoyo_path2_keyword[type])) 784b69a54eeSKentaro Takeda continue; 7857ef61233STetsuo Handa return tomoyo_update_path2_acl(type, filename, filename2, 786b69a54eeSKentaro Takeda domain, is_delete); 787b69a54eeSKentaro Takeda } 788b69a54eeSKentaro Takeda out: 789b69a54eeSKentaro Takeda return -EINVAL; 790b69a54eeSKentaro Takeda } 791b69a54eeSKentaro Takeda 792b69a54eeSKentaro Takeda /** 7937ef61233STetsuo Handa * tomoyo_update_path_acl - Update "struct tomoyo_path_acl" list. 794b69a54eeSKentaro Takeda * 795b69a54eeSKentaro Takeda * @type: Type of operation. 796b69a54eeSKentaro Takeda * @filename: Filename. 797b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 798b69a54eeSKentaro Takeda * @is_delete: True if it is a delete request. 799b69a54eeSKentaro Takeda * 800b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 801fdb8ebb7STetsuo Handa * 802fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 803b69a54eeSKentaro Takeda */ 8047ef61233STetsuo Handa static int tomoyo_update_path_acl(const u8 type, const char *filename, 8057ef61233STetsuo Handa struct tomoyo_domain_info *const domain, 8067ef61233STetsuo Handa const bool is_delete) 807b69a54eeSKentaro Takeda { 808937bf613STetsuo Handa static const u32 rw_mask = 8097ef61233STetsuo Handa (1 << TOMOYO_TYPE_READ) | (1 << TOMOYO_TYPE_WRITE); 810b69a54eeSKentaro Takeda const struct tomoyo_path_info *saved_filename; 811b69a54eeSKentaro Takeda struct tomoyo_acl_info *ptr; 8127ef61233STetsuo Handa struct tomoyo_path_acl *entry = NULL; 813ca0b7df3STetsuo Handa int error = is_delete ? -ENOENT : -ENOMEM; 814937bf613STetsuo Handa const u32 perm = 1 << type; 815b69a54eeSKentaro Takeda 816b69a54eeSKentaro Takeda if (!domain) 817b69a54eeSKentaro Takeda return -EINVAL; 81817080008STetsuo Handa if (!tomoyo_is_correct_path(filename, 0, 0, 0)) 819b69a54eeSKentaro Takeda return -EINVAL; 820bf24fb01STetsuo Handa saved_filename = tomoyo_get_name(filename); 821b69a54eeSKentaro Takeda if (!saved_filename) 822b69a54eeSKentaro Takeda return -ENOMEM; 823ca0b7df3STetsuo Handa if (!is_delete) 824ca0b7df3STetsuo Handa entry = kmalloc(sizeof(*entry), GFP_KERNEL); 825f737d95dSTetsuo Handa mutex_lock(&tomoyo_policy_lock); 826fdb8ebb7STetsuo Handa list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { 8277ef61233STetsuo Handa struct tomoyo_path_acl *acl = 8287ef61233STetsuo Handa container_of(ptr, struct tomoyo_path_acl, head); 8297ef61233STetsuo Handa if (ptr->type != TOMOYO_TYPE_PATH_ACL) 830b69a54eeSKentaro Takeda continue; 831b69a54eeSKentaro Takeda if (acl->filename != saved_filename) 832b69a54eeSKentaro Takeda continue; 833ca0b7df3STetsuo Handa if (is_delete) { 834ca0b7df3STetsuo Handa if (perm <= 0xFFFF) 835ca0b7df3STetsuo Handa acl->perm &= ~perm; 836ca0b7df3STetsuo Handa else 837ca0b7df3STetsuo Handa acl->perm_high &= ~(perm >> 16); 838ca0b7df3STetsuo Handa if ((acl->perm & rw_mask) != rw_mask) 8397ef61233STetsuo Handa acl->perm &= ~(1 << TOMOYO_TYPE_READ_WRITE); 8407ef61233STetsuo Handa else if (!(acl->perm & (1 << TOMOYO_TYPE_READ_WRITE))) 841ca0b7df3STetsuo Handa acl->perm &= ~rw_mask; 842ca0b7df3STetsuo Handa } else { 843937bf613STetsuo Handa if (perm <= 0xFFFF) 844b69a54eeSKentaro Takeda acl->perm |= perm; 845937bf613STetsuo Handa else 846937bf613STetsuo Handa acl->perm_high |= (perm >> 16); 847b69a54eeSKentaro Takeda if ((acl->perm & rw_mask) == rw_mask) 8487ef61233STetsuo Handa acl->perm |= 1 << TOMOYO_TYPE_READ_WRITE; 8497ef61233STetsuo Handa else if (acl->perm & (1 << TOMOYO_TYPE_READ_WRITE)) 850b69a54eeSKentaro Takeda acl->perm |= rw_mask; 851b69a54eeSKentaro Takeda } 852b69a54eeSKentaro Takeda error = 0; 853b69a54eeSKentaro Takeda break; 854b69a54eeSKentaro Takeda } 855ca0b7df3STetsuo Handa if (!is_delete && error && tomoyo_memory_ok(entry)) { 8567ef61233STetsuo Handa entry->head.type = TOMOYO_TYPE_PATH_ACL; 857ca0b7df3STetsuo Handa if (perm <= 0xFFFF) 858ca0b7df3STetsuo Handa entry->perm = perm; 859ca0b7df3STetsuo Handa else 860ca0b7df3STetsuo Handa entry->perm_high = (perm >> 16); 8617ef61233STetsuo Handa if (perm == (1 << TOMOYO_TYPE_READ_WRITE)) 862ca0b7df3STetsuo Handa entry->perm |= rw_mask; 863ca0b7df3STetsuo Handa entry->filename = saved_filename; 864bf24fb01STetsuo Handa saved_filename = NULL; 865ca0b7df3STetsuo Handa list_add_tail_rcu(&entry->head.list, &domain->acl_info_list); 866ca0b7df3STetsuo Handa entry = NULL; 867ca0b7df3STetsuo Handa error = 0; 868ca0b7df3STetsuo Handa } 869f737d95dSTetsuo Handa mutex_unlock(&tomoyo_policy_lock); 870ca0b7df3STetsuo Handa kfree(entry); 871bf24fb01STetsuo Handa tomoyo_put_name(saved_filename); 872b69a54eeSKentaro Takeda return error; 873b69a54eeSKentaro Takeda } 874b69a54eeSKentaro Takeda 875b69a54eeSKentaro Takeda /** 8767ef61233STetsuo Handa * tomoyo_update_path2_acl - Update "struct tomoyo_path2_acl" list. 877b69a54eeSKentaro Takeda * 878b69a54eeSKentaro Takeda * @type: Type of operation. 879b69a54eeSKentaro Takeda * @filename1: First filename. 880b69a54eeSKentaro Takeda * @filename2: Second filename. 881b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 882b69a54eeSKentaro Takeda * @is_delete: True if it is a delete request. 883b69a54eeSKentaro Takeda * 884b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 885fdb8ebb7STetsuo Handa * 886fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 887b69a54eeSKentaro Takeda */ 8887ef61233STetsuo Handa static int tomoyo_update_path2_acl(const u8 type, const char *filename1, 889b69a54eeSKentaro Takeda const char *filename2, 8907ef61233STetsuo Handa struct tomoyo_domain_info *const domain, 8917ef61233STetsuo Handa const bool is_delete) 892b69a54eeSKentaro Takeda { 893b69a54eeSKentaro Takeda const struct tomoyo_path_info *saved_filename1; 894b69a54eeSKentaro Takeda const struct tomoyo_path_info *saved_filename2; 895b69a54eeSKentaro Takeda struct tomoyo_acl_info *ptr; 8967ef61233STetsuo Handa struct tomoyo_path2_acl *entry = NULL; 897ca0b7df3STetsuo Handa int error = is_delete ? -ENOENT : -ENOMEM; 898b69a54eeSKentaro Takeda const u8 perm = 1 << type; 899b69a54eeSKentaro Takeda 900b69a54eeSKentaro Takeda if (!domain) 901b69a54eeSKentaro Takeda return -EINVAL; 90217080008STetsuo Handa if (!tomoyo_is_correct_path(filename1, 0, 0, 0) || 90317080008STetsuo Handa !tomoyo_is_correct_path(filename2, 0, 0, 0)) 904b69a54eeSKentaro Takeda return -EINVAL; 905bf24fb01STetsuo Handa saved_filename1 = tomoyo_get_name(filename1); 906bf24fb01STetsuo Handa saved_filename2 = tomoyo_get_name(filename2); 907b69a54eeSKentaro Takeda if (!saved_filename1 || !saved_filename2) 908ca0b7df3STetsuo Handa goto out; 909ca0b7df3STetsuo Handa if (!is_delete) 910ca0b7df3STetsuo Handa entry = kmalloc(sizeof(*entry), GFP_KERNEL); 911f737d95dSTetsuo Handa mutex_lock(&tomoyo_policy_lock); 912ca0b7df3STetsuo Handa list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { 9137ef61233STetsuo Handa struct tomoyo_path2_acl *acl = 9147ef61233STetsuo Handa container_of(ptr, struct tomoyo_path2_acl, head); 9157ef61233STetsuo Handa if (ptr->type != TOMOYO_TYPE_PATH2_ACL) 916ca0b7df3STetsuo Handa continue; 917ca0b7df3STetsuo Handa if (acl->filename1 != saved_filename1 || 918ca0b7df3STetsuo Handa acl->filename2 != saved_filename2) 919ca0b7df3STetsuo Handa continue; 920b69a54eeSKentaro Takeda if (is_delete) 921b69a54eeSKentaro Takeda acl->perm &= ~perm; 922ca0b7df3STetsuo Handa else 923ca0b7df3STetsuo Handa acl->perm |= perm; 924b69a54eeSKentaro Takeda error = 0; 925b69a54eeSKentaro Takeda break; 926b69a54eeSKentaro Takeda } 927ca0b7df3STetsuo Handa if (!is_delete && error && tomoyo_memory_ok(entry)) { 9287ef61233STetsuo Handa entry->head.type = TOMOYO_TYPE_PATH2_ACL; 929ca0b7df3STetsuo Handa entry->perm = perm; 930ca0b7df3STetsuo Handa entry->filename1 = saved_filename1; 931bf24fb01STetsuo Handa saved_filename1 = NULL; 932ca0b7df3STetsuo Handa entry->filename2 = saved_filename2; 933bf24fb01STetsuo Handa saved_filename2 = NULL; 934ca0b7df3STetsuo Handa list_add_tail_rcu(&entry->head.list, &domain->acl_info_list); 935ca0b7df3STetsuo Handa entry = NULL; 936ca0b7df3STetsuo Handa error = 0; 937ca0b7df3STetsuo Handa } 938f737d95dSTetsuo Handa mutex_unlock(&tomoyo_policy_lock); 939ca0b7df3STetsuo Handa out: 940bf24fb01STetsuo Handa tomoyo_put_name(saved_filename1); 941bf24fb01STetsuo Handa tomoyo_put_name(saved_filename2); 942ca0b7df3STetsuo Handa kfree(entry); 943b69a54eeSKentaro Takeda return error; 944b69a54eeSKentaro Takeda } 945b69a54eeSKentaro Takeda 946b69a54eeSKentaro Takeda /** 9477ef61233STetsuo Handa * tomoyo_path_acl - Check permission for single path operation. 948b69a54eeSKentaro Takeda * 949b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 950b69a54eeSKentaro Takeda * @type: Type of operation. 951b69a54eeSKentaro Takeda * @filename: Filename to check. 952b69a54eeSKentaro Takeda * 953b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 954fdb8ebb7STetsuo Handa * 955fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 956b69a54eeSKentaro Takeda */ 9577ef61233STetsuo Handa static int tomoyo_path_acl(struct tomoyo_domain_info *domain, const u8 type, 958b69a54eeSKentaro Takeda const struct tomoyo_path_info *filename) 959b69a54eeSKentaro Takeda { 960b69a54eeSKentaro Takeda if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE)) 961b69a54eeSKentaro Takeda return 0; 9627ef61233STetsuo Handa return tomoyo_path_acl2(domain, filename, 1 << type, 1); 963b69a54eeSKentaro Takeda } 964b69a54eeSKentaro Takeda 965b69a54eeSKentaro Takeda /** 9667ef61233STetsuo Handa * tomoyo_path2_acl - Check permission for double path operation. 967b69a54eeSKentaro Takeda * 968b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 969b69a54eeSKentaro Takeda * @type: Type of operation. 970b69a54eeSKentaro Takeda * @filename1: First filename to check. 971b69a54eeSKentaro Takeda * @filename2: Second filename to check. 972b69a54eeSKentaro Takeda * 973b69a54eeSKentaro Takeda * Returns 0 on success, -EPERM otherwise. 974fdb8ebb7STetsuo Handa * 975fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 976b69a54eeSKentaro Takeda */ 9777ef61233STetsuo Handa static int tomoyo_path2_acl(const struct tomoyo_domain_info *domain, 978b69a54eeSKentaro Takeda const u8 type, 9797ef61233STetsuo Handa const struct tomoyo_path_info *filename1, 9807ef61233STetsuo Handa const struct tomoyo_path_info *filename2) 981b69a54eeSKentaro Takeda { 982b69a54eeSKentaro Takeda struct tomoyo_acl_info *ptr; 983b69a54eeSKentaro Takeda const u8 perm = 1 << type; 984b69a54eeSKentaro Takeda int error = -EPERM; 985b69a54eeSKentaro Takeda 986b69a54eeSKentaro Takeda if (!tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE)) 987b69a54eeSKentaro Takeda return 0; 988fdb8ebb7STetsuo Handa list_for_each_entry_rcu(ptr, &domain->acl_info_list, list) { 9897ef61233STetsuo Handa struct tomoyo_path2_acl *acl; 9907ef61233STetsuo Handa if (ptr->type != TOMOYO_TYPE_PATH2_ACL) 991b69a54eeSKentaro Takeda continue; 9927ef61233STetsuo Handa acl = container_of(ptr, struct tomoyo_path2_acl, head); 993b69a54eeSKentaro Takeda if (!(acl->perm & perm)) 994b69a54eeSKentaro Takeda continue; 995b69a54eeSKentaro Takeda if (!tomoyo_path_matches_pattern(filename1, acl->filename1)) 996b69a54eeSKentaro Takeda continue; 997b69a54eeSKentaro Takeda if (!tomoyo_path_matches_pattern(filename2, acl->filename2)) 998b69a54eeSKentaro Takeda continue; 999b69a54eeSKentaro Takeda error = 0; 1000b69a54eeSKentaro Takeda break; 1001b69a54eeSKentaro Takeda } 1002b69a54eeSKentaro Takeda return error; 1003b69a54eeSKentaro Takeda } 1004b69a54eeSKentaro Takeda 1005b69a54eeSKentaro Takeda /** 10067ef61233STetsuo Handa * tomoyo_path_permission2 - Check permission for single path operation. 1007b69a54eeSKentaro Takeda * 1008b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 1009b69a54eeSKentaro Takeda * @operation: Type of operation. 1010b69a54eeSKentaro Takeda * @filename: Filename to check. 1011b69a54eeSKentaro Takeda * @mode: Access control mode. 1012b69a54eeSKentaro Takeda * 1013b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 1014fdb8ebb7STetsuo Handa * 1015fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 1016b69a54eeSKentaro Takeda */ 10177ef61233STetsuo Handa static int tomoyo_path_permission2(struct tomoyo_domain_info *const domain, 10187ef61233STetsuo Handa u8 operation, 10197ef61233STetsuo Handa const struct tomoyo_path_info *filename, 10207ef61233STetsuo Handa const u8 mode) 1021b69a54eeSKentaro Takeda { 1022b69a54eeSKentaro Takeda const char *msg; 1023b69a54eeSKentaro Takeda int error; 1024b69a54eeSKentaro Takeda const bool is_enforce = (mode == 3); 1025b69a54eeSKentaro Takeda 1026b69a54eeSKentaro Takeda if (!mode) 1027b69a54eeSKentaro Takeda return 0; 1028b69a54eeSKentaro Takeda next: 10297ef61233STetsuo Handa error = tomoyo_path_acl(domain, operation, filename); 10307ef61233STetsuo Handa msg = tomoyo_path2keyword(operation); 1031b69a54eeSKentaro Takeda if (!error) 1032b69a54eeSKentaro Takeda goto ok; 1033b69a54eeSKentaro Takeda if (tomoyo_verbose_mode(domain)) 1034b69a54eeSKentaro Takeda printk(KERN_WARNING "TOMOYO-%s: Access '%s %s' denied for %s\n", 1035b69a54eeSKentaro Takeda tomoyo_get_msg(is_enforce), msg, filename->name, 1036b69a54eeSKentaro Takeda tomoyo_get_last_name(domain)); 1037b69a54eeSKentaro Takeda if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) { 1038b69a54eeSKentaro Takeda const char *name = tomoyo_get_file_pattern(filename)->name; 10397ef61233STetsuo Handa tomoyo_update_path_acl(operation, name, domain, false); 1040b69a54eeSKentaro Takeda } 1041b69a54eeSKentaro Takeda if (!is_enforce) 1042b69a54eeSKentaro Takeda error = 0; 1043b69a54eeSKentaro Takeda ok: 1044b69a54eeSKentaro Takeda /* 1045b69a54eeSKentaro Takeda * Since "allow_truncate" doesn't imply "allow_rewrite" permission, 1046b69a54eeSKentaro Takeda * we need to check "allow_rewrite" permission if the filename is 1047b69a54eeSKentaro Takeda * specified by "deny_rewrite" keyword. 1048b69a54eeSKentaro Takeda */ 10497ef61233STetsuo Handa if (!error && operation == TOMOYO_TYPE_TRUNCATE && 1050b69a54eeSKentaro Takeda tomoyo_is_no_rewrite_file(filename)) { 10517ef61233STetsuo Handa operation = TOMOYO_TYPE_REWRITE; 1052b69a54eeSKentaro Takeda goto next; 1053b69a54eeSKentaro Takeda } 1054b69a54eeSKentaro Takeda return error; 1055b69a54eeSKentaro Takeda } 1056b69a54eeSKentaro Takeda 1057b69a54eeSKentaro Takeda /** 1058b69a54eeSKentaro Takeda * tomoyo_check_exec_perm - Check permission for "execute". 1059b69a54eeSKentaro Takeda * 1060b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 1061b69a54eeSKentaro Takeda * @filename: Check permission for "execute". 1062b69a54eeSKentaro Takeda * 1063b69a54eeSKentaro Takeda * Returns 0 on success, negativevalue otherwise. 1064fdb8ebb7STetsuo Handa * 1065fdb8ebb7STetsuo Handa * Caller holds tomoyo_read_lock(). 1066b69a54eeSKentaro Takeda */ 1067b69a54eeSKentaro Takeda int tomoyo_check_exec_perm(struct tomoyo_domain_info *domain, 1068bcb86975STetsuo Handa const struct tomoyo_path_info *filename) 1069b69a54eeSKentaro Takeda { 1070b69a54eeSKentaro Takeda const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); 1071b69a54eeSKentaro Takeda 1072b69a54eeSKentaro Takeda if (!mode) 1073b69a54eeSKentaro Takeda return 0; 1074b69a54eeSKentaro Takeda return tomoyo_check_file_perm2(domain, filename, 1, "do_execve", mode); 1075b69a54eeSKentaro Takeda } 1076b69a54eeSKentaro Takeda 1077b69a54eeSKentaro Takeda /** 1078b69a54eeSKentaro Takeda * tomoyo_check_open_permission - Check permission for "read" and "write". 1079b69a54eeSKentaro Takeda * 1080b69a54eeSKentaro Takeda * @domain: Pointer to "struct tomoyo_domain_info". 1081b69a54eeSKentaro Takeda * @path: Pointer to "struct path". 1082b69a54eeSKentaro Takeda * @flag: Flags for open(). 1083b69a54eeSKentaro Takeda * 1084b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 1085b69a54eeSKentaro Takeda */ 1086b69a54eeSKentaro Takeda int tomoyo_check_open_permission(struct tomoyo_domain_info *domain, 1087b69a54eeSKentaro Takeda struct path *path, const int flag) 1088b69a54eeSKentaro Takeda { 1089b69a54eeSKentaro Takeda const u8 acc_mode = ACC_MODE(flag); 1090b69a54eeSKentaro Takeda int error = -ENOMEM; 1091b69a54eeSKentaro Takeda struct tomoyo_path_info *buf; 1092b69a54eeSKentaro Takeda const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); 1093b69a54eeSKentaro Takeda const bool is_enforce = (mode == 3); 1094fdb8ebb7STetsuo Handa int idx; 1095b69a54eeSKentaro Takeda 1096b69a54eeSKentaro Takeda if (!mode || !path->mnt) 1097b69a54eeSKentaro Takeda return 0; 1098b69a54eeSKentaro Takeda if (acc_mode == 0) 1099b69a54eeSKentaro Takeda return 0; 1100b69a54eeSKentaro Takeda if (path->dentry->d_inode && S_ISDIR(path->dentry->d_inode->i_mode)) 1101b69a54eeSKentaro Takeda /* 1102b69a54eeSKentaro Takeda * I don't check directories here because mkdir() and rmdir() 1103b69a54eeSKentaro Takeda * don't call me. 1104b69a54eeSKentaro Takeda */ 1105b69a54eeSKentaro Takeda return 0; 1106fdb8ebb7STetsuo Handa idx = tomoyo_read_lock(); 1107b69a54eeSKentaro Takeda buf = tomoyo_get_path(path); 1108b69a54eeSKentaro Takeda if (!buf) 1109b69a54eeSKentaro Takeda goto out; 1110b69a54eeSKentaro Takeda error = 0; 1111b69a54eeSKentaro Takeda /* 1112b69a54eeSKentaro Takeda * If the filename is specified by "deny_rewrite" keyword, 1113b69a54eeSKentaro Takeda * we need to check "allow_rewrite" permission when the filename is not 1114b69a54eeSKentaro Takeda * opened for append mode or the filename is truncated at open time. 1115b69a54eeSKentaro Takeda */ 1116b69a54eeSKentaro Takeda if ((acc_mode & MAY_WRITE) && 1117b69a54eeSKentaro Takeda ((flag & O_TRUNC) || !(flag & O_APPEND)) && 1118b69a54eeSKentaro Takeda (tomoyo_is_no_rewrite_file(buf))) { 11197ef61233STetsuo Handa error = tomoyo_path_permission2(domain, TOMOYO_TYPE_REWRITE, 1120b69a54eeSKentaro Takeda buf, mode); 1121b69a54eeSKentaro Takeda } 1122b69a54eeSKentaro Takeda if (!error) 1123b69a54eeSKentaro Takeda error = tomoyo_check_file_perm2(domain, buf, acc_mode, "open", 1124b69a54eeSKentaro Takeda mode); 1125b69a54eeSKentaro Takeda if (!error && (flag & O_TRUNC)) 11267ef61233STetsuo Handa error = tomoyo_path_permission2(domain, TOMOYO_TYPE_TRUNCATE, 1127b69a54eeSKentaro Takeda buf, mode); 1128b69a54eeSKentaro Takeda out: 11298e2d39a1STetsuo Handa kfree(buf); 1130fdb8ebb7STetsuo Handa tomoyo_read_unlock(idx); 1131b69a54eeSKentaro Takeda if (!is_enforce) 1132b69a54eeSKentaro Takeda error = 0; 1133b69a54eeSKentaro Takeda return error; 1134b69a54eeSKentaro Takeda } 1135b69a54eeSKentaro Takeda 1136b69a54eeSKentaro Takeda /** 11377ef61233STetsuo 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". 1138b69a54eeSKentaro Takeda * 1139b69a54eeSKentaro Takeda * @operation: Type of operation. 1140b69a54eeSKentaro Takeda * @path: Pointer to "struct path". 1141b69a54eeSKentaro Takeda * 1142b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 1143b69a54eeSKentaro Takeda */ 114497d6931eSTetsuo Handa int tomoyo_path_perm(const u8 operation, struct path *path) 1145b69a54eeSKentaro Takeda { 1146b69a54eeSKentaro Takeda int error = -ENOMEM; 1147b69a54eeSKentaro Takeda struct tomoyo_path_info *buf; 114897d6931eSTetsuo Handa struct tomoyo_domain_info *domain = tomoyo_domain(); 1149b69a54eeSKentaro Takeda const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); 1150b69a54eeSKentaro Takeda const bool is_enforce = (mode == 3); 1151fdb8ebb7STetsuo Handa int idx; 1152b69a54eeSKentaro Takeda 1153b69a54eeSKentaro Takeda if (!mode || !path->mnt) 1154b69a54eeSKentaro Takeda return 0; 1155fdb8ebb7STetsuo Handa idx = tomoyo_read_lock(); 1156b69a54eeSKentaro Takeda buf = tomoyo_get_path(path); 1157b69a54eeSKentaro Takeda if (!buf) 1158b69a54eeSKentaro Takeda goto out; 1159b69a54eeSKentaro Takeda switch (operation) { 11607ef61233STetsuo Handa case TOMOYO_TYPE_MKDIR: 11617ef61233STetsuo Handa case TOMOYO_TYPE_RMDIR: 11627ef61233STetsuo Handa case TOMOYO_TYPE_CHROOT: 1163b69a54eeSKentaro Takeda if (!buf->is_dir) { 1164b69a54eeSKentaro Takeda /* 1165b69a54eeSKentaro Takeda * tomoyo_get_path() reserves space for appending "/." 1166b69a54eeSKentaro Takeda */ 1167b69a54eeSKentaro Takeda strcat((char *) buf->name, "/"); 1168b69a54eeSKentaro Takeda tomoyo_fill_path_info(buf); 1169b69a54eeSKentaro Takeda } 1170b69a54eeSKentaro Takeda } 11717ef61233STetsuo Handa error = tomoyo_path_permission2(domain, operation, buf, mode); 1172b69a54eeSKentaro Takeda out: 11738e2d39a1STetsuo Handa kfree(buf); 1174fdb8ebb7STetsuo Handa tomoyo_read_unlock(idx); 1175b69a54eeSKentaro Takeda if (!is_enforce) 1176b69a54eeSKentaro Takeda error = 0; 1177b69a54eeSKentaro Takeda return error; 1178b69a54eeSKentaro Takeda } 1179b69a54eeSKentaro Takeda 1180b69a54eeSKentaro Takeda /** 1181b69a54eeSKentaro Takeda * tomoyo_check_rewrite_permission - Check permission for "rewrite". 1182b69a54eeSKentaro Takeda * 1183b69a54eeSKentaro Takeda * @filp: Pointer to "struct file". 1184b69a54eeSKentaro Takeda * 1185b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 1186b69a54eeSKentaro Takeda */ 118797d6931eSTetsuo Handa int tomoyo_check_rewrite_permission(struct file *filp) 1188b69a54eeSKentaro Takeda { 1189b69a54eeSKentaro Takeda int error = -ENOMEM; 119097d6931eSTetsuo Handa struct tomoyo_domain_info *domain = tomoyo_domain(); 1191b69a54eeSKentaro Takeda const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); 1192b69a54eeSKentaro Takeda const bool is_enforce = (mode == 3); 1193b69a54eeSKentaro Takeda struct tomoyo_path_info *buf; 1194fdb8ebb7STetsuo Handa int idx; 1195b69a54eeSKentaro Takeda 1196b69a54eeSKentaro Takeda if (!mode || !filp->f_path.mnt) 1197b69a54eeSKentaro Takeda return 0; 1198fdb8ebb7STetsuo Handa 1199fdb8ebb7STetsuo Handa idx = tomoyo_read_lock(); 1200b69a54eeSKentaro Takeda buf = tomoyo_get_path(&filp->f_path); 1201b69a54eeSKentaro Takeda if (!buf) 1202b69a54eeSKentaro Takeda goto out; 1203b69a54eeSKentaro Takeda if (!tomoyo_is_no_rewrite_file(buf)) { 1204b69a54eeSKentaro Takeda error = 0; 1205b69a54eeSKentaro Takeda goto out; 1206b69a54eeSKentaro Takeda } 12077ef61233STetsuo Handa error = tomoyo_path_permission2(domain, TOMOYO_TYPE_REWRITE, buf, mode); 1208b69a54eeSKentaro Takeda out: 12098e2d39a1STetsuo Handa kfree(buf); 1210fdb8ebb7STetsuo Handa tomoyo_read_unlock(idx); 1211b69a54eeSKentaro Takeda if (!is_enforce) 1212b69a54eeSKentaro Takeda error = 0; 1213b69a54eeSKentaro Takeda return error; 1214b69a54eeSKentaro Takeda } 1215b69a54eeSKentaro Takeda 1216b69a54eeSKentaro Takeda /** 12177ef61233STetsuo Handa * tomoyo_path2_perm - Check permission for "rename", "link" and "pivot_root". 1218b69a54eeSKentaro Takeda * 1219b69a54eeSKentaro Takeda * @operation: Type of operation. 1220b69a54eeSKentaro Takeda * @path1: Pointer to "struct path". 1221b69a54eeSKentaro Takeda * @path2: Pointer to "struct path". 1222b69a54eeSKentaro Takeda * 1223b69a54eeSKentaro Takeda * Returns 0 on success, negative value otherwise. 1224b69a54eeSKentaro Takeda */ 122597d6931eSTetsuo Handa int tomoyo_path2_perm(const u8 operation, struct path *path1, 1226b69a54eeSKentaro Takeda struct path *path2) 1227b69a54eeSKentaro Takeda { 1228b69a54eeSKentaro Takeda int error = -ENOMEM; 1229b69a54eeSKentaro Takeda struct tomoyo_path_info *buf1, *buf2; 123097d6931eSTetsuo Handa struct tomoyo_domain_info *domain = tomoyo_domain(); 1231b69a54eeSKentaro Takeda const u8 mode = tomoyo_check_flags(domain, TOMOYO_MAC_FOR_FILE); 1232b69a54eeSKentaro Takeda const bool is_enforce = (mode == 3); 1233b69a54eeSKentaro Takeda const char *msg; 1234fdb8ebb7STetsuo Handa int idx; 1235b69a54eeSKentaro Takeda 1236b69a54eeSKentaro Takeda if (!mode || !path1->mnt || !path2->mnt) 1237b69a54eeSKentaro Takeda return 0; 1238fdb8ebb7STetsuo Handa idx = tomoyo_read_lock(); 1239b69a54eeSKentaro Takeda buf1 = tomoyo_get_path(path1); 1240b69a54eeSKentaro Takeda buf2 = tomoyo_get_path(path2); 1241b69a54eeSKentaro Takeda if (!buf1 || !buf2) 1242b69a54eeSKentaro Takeda goto out; 1243b69a54eeSKentaro Takeda { 1244b69a54eeSKentaro Takeda struct dentry *dentry = path1->dentry; 1245b69a54eeSKentaro Takeda if (dentry->d_inode && S_ISDIR(dentry->d_inode->i_mode)) { 1246b69a54eeSKentaro Takeda /* 1247b69a54eeSKentaro Takeda * tomoyo_get_path() reserves space for appending "/." 1248b69a54eeSKentaro Takeda */ 1249b69a54eeSKentaro Takeda if (!buf1->is_dir) { 1250b69a54eeSKentaro Takeda strcat((char *) buf1->name, "/"); 1251b69a54eeSKentaro Takeda tomoyo_fill_path_info(buf1); 1252b69a54eeSKentaro Takeda } 1253b69a54eeSKentaro Takeda if (!buf2->is_dir) { 1254b69a54eeSKentaro Takeda strcat((char *) buf2->name, "/"); 1255b69a54eeSKentaro Takeda tomoyo_fill_path_info(buf2); 1256b69a54eeSKentaro Takeda } 1257b69a54eeSKentaro Takeda } 1258b69a54eeSKentaro Takeda } 12597ef61233STetsuo Handa error = tomoyo_path2_acl(domain, operation, buf1, buf2); 12607ef61233STetsuo Handa msg = tomoyo_path22keyword(operation); 1261b69a54eeSKentaro Takeda if (!error) 1262b69a54eeSKentaro Takeda goto out; 1263b69a54eeSKentaro Takeda if (tomoyo_verbose_mode(domain)) 1264b69a54eeSKentaro Takeda printk(KERN_WARNING "TOMOYO-%s: Access '%s %s %s' " 1265b69a54eeSKentaro Takeda "denied for %s\n", tomoyo_get_msg(is_enforce), 1266b69a54eeSKentaro Takeda msg, buf1->name, buf2->name, 1267b69a54eeSKentaro Takeda tomoyo_get_last_name(domain)); 1268b69a54eeSKentaro Takeda if (mode == 1 && tomoyo_domain_quota_is_ok(domain)) { 1269b69a54eeSKentaro Takeda const char *name1 = tomoyo_get_file_pattern(buf1)->name; 1270b69a54eeSKentaro Takeda const char *name2 = tomoyo_get_file_pattern(buf2)->name; 12717ef61233STetsuo Handa tomoyo_update_path2_acl(operation, name1, name2, domain, 1272b69a54eeSKentaro Takeda false); 1273b69a54eeSKentaro Takeda } 1274b69a54eeSKentaro Takeda out: 12758e2d39a1STetsuo Handa kfree(buf1); 12768e2d39a1STetsuo Handa kfree(buf2); 1277fdb8ebb7STetsuo Handa tomoyo_read_unlock(idx); 1278b69a54eeSKentaro Takeda if (!is_enforce) 1279b69a54eeSKentaro Takeda error = 0; 1280b69a54eeSKentaro Takeda return error; 1281b69a54eeSKentaro Takeda } 1282