Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 1 | /* |
| 2 | * security/tomoyo/domain.c |
| 3 | * |
| 4 | * Implementation of the Domain-Based Mandatory Access Control. |
| 5 | * |
| 6 | * Copyright (C) 2005-2009 NTT DATA CORPORATION |
| 7 | * |
Tetsuo Handa | 39826a1 | 2009-04-08 22:31:28 +0900 | [diff] [blame] | 8 | * Version: 2.2.0 2009/04/01 |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 9 | * |
| 10 | */ |
| 11 | |
| 12 | #include "common.h" |
| 13 | #include "tomoyo.h" |
| 14 | #include "realpath.h" |
| 15 | #include <linux/binfmts.h> |
| 16 | |
| 17 | /* Variables definitions.*/ |
| 18 | |
| 19 | /* The initial domain. */ |
| 20 | struct tomoyo_domain_info tomoyo_kernel_domain; |
| 21 | |
Tetsuo Handa | c3fa109 | 2009-06-08 12:37:39 +0900 | [diff] [blame] | 22 | /* |
| 23 | * tomoyo_domain_list is used for holding list of domains. |
| 24 | * The ->acl_info_list of "struct tomoyo_domain_info" is used for holding |
| 25 | * permissions (e.g. "allow_read /lib/libc-2.5.so") given to each domain. |
| 26 | * |
| 27 | * An entry is added by |
| 28 | * |
| 29 | * # ( echo "<kernel>"; echo "allow_execute /sbin/init" ) > \ |
| 30 | * /sys/kernel/security/tomoyo/domain_policy |
| 31 | * |
| 32 | * and is deleted by |
| 33 | * |
| 34 | * # ( echo "<kernel>"; echo "delete allow_execute /sbin/init" ) > \ |
| 35 | * /sys/kernel/security/tomoyo/domain_policy |
| 36 | * |
| 37 | * and all entries are retrieved by |
| 38 | * |
| 39 | * # cat /sys/kernel/security/tomoyo/domain_policy |
| 40 | * |
| 41 | * A domain is added by |
| 42 | * |
| 43 | * # echo "<kernel>" > /sys/kernel/security/tomoyo/domain_policy |
| 44 | * |
| 45 | * and is deleted by |
| 46 | * |
| 47 | * # echo "delete <kernel>" > /sys/kernel/security/tomoyo/domain_policy |
| 48 | * |
| 49 | * and all domains are retrieved by |
| 50 | * |
| 51 | * # grep '^<kernel>' /sys/kernel/security/tomoyo/domain_policy |
| 52 | * |
| 53 | * Normally, a domainname is monotonically getting longer because a domainname |
| 54 | * which the process will belong to if an execve() operation succeeds is |
| 55 | * defined as a concatenation of "current domainname" + "pathname passed to |
| 56 | * execve()". |
| 57 | * See tomoyo_domain_initializer_list and tomoyo_domain_keeper_list for |
| 58 | * exceptions. |
| 59 | */ |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 60 | LIST_HEAD(tomoyo_domain_list); |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 61 | |
Tetsuo Handa | c3fa109 | 2009-06-08 12:37:39 +0900 | [diff] [blame] | 62 | /* |
| 63 | * tomoyo_domain_initializer_entry is a structure which is used for holding |
| 64 | * "initialize_domain" and "no_initialize_domain" entries. |
| 65 | * It has following fields. |
| 66 | * |
| 67 | * (1) "list" which is linked to tomoyo_domain_initializer_list . |
| 68 | * (2) "domainname" which is "a domainname" or "the last component of a |
| 69 | * domainname". This field is NULL if "from" clause is not specified. |
| 70 | * (3) "program" which is a program's pathname. |
| 71 | * (4) "is_deleted" is a bool which is true if marked as deleted, false |
| 72 | * otherwise. |
| 73 | * (5) "is_not" is a bool which is true if "no_initialize_domain", false |
| 74 | * otherwise. |
| 75 | * (6) "is_last_name" is a bool which is true if "domainname" is "the last |
| 76 | * component of a domainname", false otherwise. |
| 77 | */ |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 78 | struct tomoyo_domain_initializer_entry { |
| 79 | struct list_head list; |
| 80 | const struct tomoyo_path_info *domainname; /* This may be NULL */ |
| 81 | const struct tomoyo_path_info *program; |
| 82 | bool is_deleted; |
| 83 | bool is_not; /* True if this entry is "no_initialize_domain". */ |
| 84 | /* True if the domainname is tomoyo_get_last_name(). */ |
| 85 | bool is_last_name; |
| 86 | }; |
| 87 | |
Tetsuo Handa | c3fa109 | 2009-06-08 12:37:39 +0900 | [diff] [blame] | 88 | /* |
| 89 | * tomoyo_domain_keeper_entry is a structure which is used for holding |
| 90 | * "keep_domain" and "no_keep_domain" entries. |
| 91 | * It has following fields. |
| 92 | * |
| 93 | * (1) "list" which is linked to tomoyo_domain_keeper_list . |
| 94 | * (2) "domainname" which is "a domainname" or "the last component of a |
| 95 | * domainname". |
| 96 | * (3) "program" which is a program's pathname. |
| 97 | * This field is NULL if "from" clause is not specified. |
| 98 | * (4) "is_deleted" is a bool which is true if marked as deleted, false |
| 99 | * otherwise. |
| 100 | * (5) "is_not" is a bool which is true if "no_initialize_domain", false |
| 101 | * otherwise. |
| 102 | * (6) "is_last_name" is a bool which is true if "domainname" is "the last |
| 103 | * component of a domainname", false otherwise. |
| 104 | */ |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 105 | struct tomoyo_domain_keeper_entry { |
| 106 | struct list_head list; |
| 107 | const struct tomoyo_path_info *domainname; |
| 108 | const struct tomoyo_path_info *program; /* This may be NULL */ |
| 109 | bool is_deleted; |
| 110 | bool is_not; /* True if this entry is "no_keep_domain". */ |
| 111 | /* True if the domainname is tomoyo_get_last_name(). */ |
| 112 | bool is_last_name; |
| 113 | }; |
| 114 | |
Tetsuo Handa | c3fa109 | 2009-06-08 12:37:39 +0900 | [diff] [blame] | 115 | /* |
| 116 | * tomoyo_alias_entry is a structure which is used for holding "alias" entries. |
| 117 | * It has following fields. |
| 118 | * |
| 119 | * (1) "list" which is linked to tomoyo_alias_list . |
| 120 | * (2) "original_name" which is a dereferenced pathname. |
| 121 | * (3) "aliased_name" which is a symlink's pathname. |
| 122 | * (4) "is_deleted" is a bool which is true if marked as deleted, false |
| 123 | * otherwise. |
| 124 | */ |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 125 | struct tomoyo_alias_entry { |
| 126 | struct list_head list; |
| 127 | const struct tomoyo_path_info *original_name; |
| 128 | const struct tomoyo_path_info *aliased_name; |
| 129 | bool is_deleted; |
| 130 | }; |
| 131 | |
| 132 | /** |
| 133 | * tomoyo_set_domain_flag - Set or clear domain's attribute flags. |
| 134 | * |
| 135 | * @domain: Pointer to "struct tomoyo_domain_info". |
| 136 | * @is_delete: True if it is a delete request. |
| 137 | * @flags: Flags to set or clear. |
| 138 | * |
| 139 | * Returns nothing. |
| 140 | */ |
| 141 | void tomoyo_set_domain_flag(struct tomoyo_domain_info *domain, |
| 142 | const bool is_delete, const u8 flags) |
| 143 | { |
| 144 | /* We need to serialize because this is bitfield operation. */ |
| 145 | static DEFINE_SPINLOCK(lock); |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 146 | spin_lock(&lock); |
| 147 | if (!is_delete) |
| 148 | domain->flags |= flags; |
| 149 | else |
| 150 | domain->flags &= ~flags; |
| 151 | spin_unlock(&lock); |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 152 | } |
| 153 | |
| 154 | /** |
| 155 | * tomoyo_get_last_name - Get last component of a domainname. |
| 156 | * |
| 157 | * @domain: Pointer to "struct tomoyo_domain_info". |
| 158 | * |
| 159 | * Returns the last component of the domainname. |
| 160 | */ |
| 161 | const char *tomoyo_get_last_name(const struct tomoyo_domain_info *domain) |
| 162 | { |
| 163 | const char *cp0 = domain->domainname->name; |
| 164 | const char *cp1 = strrchr(cp0, ' '); |
| 165 | |
| 166 | if (cp1) |
| 167 | return cp1 + 1; |
| 168 | return cp0; |
| 169 | } |
| 170 | |
Tetsuo Handa | c3fa109 | 2009-06-08 12:37:39 +0900 | [diff] [blame] | 171 | /* |
| 172 | * tomoyo_domain_initializer_list is used for holding list of programs which |
| 173 | * triggers reinitialization of domainname. Normally, a domainname is |
| 174 | * monotonically getting longer. But sometimes, we restart daemon programs. |
| 175 | * It would be convenient for us that "a daemon started upon system boot" and |
| 176 | * "the daemon restarted from console" belong to the same domain. Thus, TOMOYO |
| 177 | * provides a way to shorten domainnames. |
| 178 | * |
| 179 | * An entry is added by |
| 180 | * |
| 181 | * # echo 'initialize_domain /usr/sbin/httpd' > \ |
| 182 | * /sys/kernel/security/tomoyo/exception_policy |
| 183 | * |
| 184 | * and is deleted by |
| 185 | * |
| 186 | * # echo 'delete initialize_domain /usr/sbin/httpd' > \ |
| 187 | * /sys/kernel/security/tomoyo/exception_policy |
| 188 | * |
| 189 | * and all entries are retrieved by |
| 190 | * |
| 191 | * # grep ^initialize_domain /sys/kernel/security/tomoyo/exception_policy |
| 192 | * |
| 193 | * In the example above, /usr/sbin/httpd will belong to |
| 194 | * "<kernel> /usr/sbin/httpd" domain. |
| 195 | * |
| 196 | * You may specify a domainname using "from" keyword. |
| 197 | * "initialize_domain /usr/sbin/httpd from <kernel> /etc/rc.d/init.d/httpd" |
| 198 | * will cause "/usr/sbin/httpd" executed from "<kernel> /etc/rc.d/init.d/httpd" |
| 199 | * domain to belong to "<kernel> /usr/sbin/httpd" domain. |
| 200 | * |
| 201 | * You may add "no_" prefix to "initialize_domain". |
| 202 | * "initialize_domain /usr/sbin/httpd" and |
| 203 | * "no_initialize_domain /usr/sbin/httpd from <kernel> /etc/rc.d/init.d/httpd" |
| 204 | * will cause "/usr/sbin/httpd" to belong to "<kernel> /usr/sbin/httpd" domain |
| 205 | * unless executed from "<kernel> /etc/rc.d/init.d/httpd" domain. |
| 206 | */ |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 207 | static LIST_HEAD(tomoyo_domain_initializer_list); |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 208 | |
| 209 | /** |
| 210 | * tomoyo_update_domain_initializer_entry - Update "struct tomoyo_domain_initializer_entry" list. |
| 211 | * |
| 212 | * @domainname: The name of domain. May be NULL. |
| 213 | * @program: The name of program. |
| 214 | * @is_not: True if it is "no_initialize_domain" entry. |
| 215 | * @is_delete: True if it is a delete request. |
| 216 | * |
| 217 | * Returns 0 on success, negative value otherwise. |
Tetsuo Handa | fdb8ebb | 2009-12-08 09:34:43 +0900 | [diff] [blame] | 218 | * |
| 219 | * Caller holds tomoyo_read_lock(). |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 220 | */ |
| 221 | static int tomoyo_update_domain_initializer_entry(const char *domainname, |
| 222 | const char *program, |
| 223 | const bool is_not, |
| 224 | const bool is_delete) |
| 225 | { |
| 226 | struct tomoyo_domain_initializer_entry *new_entry; |
| 227 | struct tomoyo_domain_initializer_entry *ptr; |
| 228 | const struct tomoyo_path_info *saved_program; |
| 229 | const struct tomoyo_path_info *saved_domainname = NULL; |
| 230 | int error = -ENOMEM; |
| 231 | bool is_last_name = false; |
| 232 | |
| 233 | if (!tomoyo_is_correct_path(program, 1, -1, -1, __func__)) |
| 234 | return -EINVAL; /* No patterns allowed. */ |
| 235 | if (domainname) { |
| 236 | if (!tomoyo_is_domain_def(domainname) && |
| 237 | tomoyo_is_correct_path(domainname, 1, -1, -1, __func__)) |
| 238 | is_last_name = true; |
| 239 | else if (!tomoyo_is_correct_domain(domainname, __func__)) |
| 240 | return -EINVAL; |
| 241 | saved_domainname = tomoyo_save_name(domainname); |
| 242 | if (!saved_domainname) |
| 243 | return -ENOMEM; |
| 244 | } |
| 245 | saved_program = tomoyo_save_name(program); |
| 246 | if (!saved_program) |
| 247 | return -ENOMEM; |
Tetsuo Handa | cd7bec6 | 2010-01-05 06:39:37 +0900 | [diff] [blame^] | 248 | new_entry = kmalloc(sizeof(*new_entry), GFP_KERNEL); |
Tetsuo Handa | f737d95 | 2010-01-03 21:16:32 +0900 | [diff] [blame] | 249 | mutex_lock(&tomoyo_policy_lock); |
Tetsuo Handa | fdb8ebb | 2009-12-08 09:34:43 +0900 | [diff] [blame] | 250 | list_for_each_entry_rcu(ptr, &tomoyo_domain_initializer_list, list) { |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 251 | if (ptr->is_not != is_not || |
| 252 | ptr->domainname != saved_domainname || |
| 253 | ptr->program != saved_program) |
| 254 | continue; |
| 255 | ptr->is_deleted = is_delete; |
| 256 | error = 0; |
| 257 | goto out; |
| 258 | } |
| 259 | if (is_delete) { |
| 260 | error = -ENOENT; |
| 261 | goto out; |
| 262 | } |
Tetsuo Handa | cd7bec6 | 2010-01-05 06:39:37 +0900 | [diff] [blame^] | 263 | if (!tomoyo_memory_ok(new_entry)) |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 264 | goto out; |
| 265 | new_entry->domainname = saved_domainname; |
| 266 | new_entry->program = saved_program; |
| 267 | new_entry->is_not = is_not; |
| 268 | new_entry->is_last_name = is_last_name; |
Tetsuo Handa | fdb8ebb | 2009-12-08 09:34:43 +0900 | [diff] [blame] | 269 | list_add_tail_rcu(&new_entry->list, &tomoyo_domain_initializer_list); |
Tetsuo Handa | cd7bec6 | 2010-01-05 06:39:37 +0900 | [diff] [blame^] | 270 | new_entry = NULL; |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 271 | error = 0; |
| 272 | out: |
Tetsuo Handa | f737d95 | 2010-01-03 21:16:32 +0900 | [diff] [blame] | 273 | mutex_unlock(&tomoyo_policy_lock); |
Tetsuo Handa | cd7bec6 | 2010-01-05 06:39:37 +0900 | [diff] [blame^] | 274 | kfree(new_entry); |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 275 | return error; |
| 276 | } |
| 277 | |
| 278 | /** |
| 279 | * tomoyo_read_domain_initializer_policy - Read "struct tomoyo_domain_initializer_entry" list. |
| 280 | * |
| 281 | * @head: Pointer to "struct tomoyo_io_buffer". |
| 282 | * |
| 283 | * Returns true on success, false otherwise. |
Tetsuo Handa | fdb8ebb | 2009-12-08 09:34:43 +0900 | [diff] [blame] | 284 | * |
| 285 | * Caller holds tomoyo_read_lock(). |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 286 | */ |
| 287 | bool tomoyo_read_domain_initializer_policy(struct tomoyo_io_buffer *head) |
| 288 | { |
| 289 | struct list_head *pos; |
| 290 | bool done = true; |
| 291 | |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 292 | list_for_each_cookie(pos, head->read_var2, |
| 293 | &tomoyo_domain_initializer_list) { |
| 294 | const char *no; |
| 295 | const char *from = ""; |
| 296 | const char *domain = ""; |
| 297 | struct tomoyo_domain_initializer_entry *ptr; |
| 298 | ptr = list_entry(pos, struct tomoyo_domain_initializer_entry, |
| 299 | list); |
| 300 | if (ptr->is_deleted) |
| 301 | continue; |
| 302 | no = ptr->is_not ? "no_" : ""; |
| 303 | if (ptr->domainname) { |
| 304 | from = " from "; |
| 305 | domain = ptr->domainname->name; |
| 306 | } |
Tetsuo Handa | 7d2948b | 2009-06-02 20:42:24 +0900 | [diff] [blame] | 307 | done = tomoyo_io_printf(head, |
| 308 | "%s" TOMOYO_KEYWORD_INITIALIZE_DOMAIN |
| 309 | "%s%s%s\n", no, ptr->program->name, |
| 310 | from, domain); |
| 311 | if (!done) |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 312 | break; |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 313 | } |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 314 | return done; |
| 315 | } |
| 316 | |
| 317 | /** |
| 318 | * tomoyo_write_domain_initializer_policy - Write "struct tomoyo_domain_initializer_entry" list. |
| 319 | * |
| 320 | * @data: String to parse. |
| 321 | * @is_not: True if it is "no_initialize_domain" entry. |
| 322 | * @is_delete: True if it is a delete request. |
| 323 | * |
| 324 | * Returns 0 on success, negative value otherwise. |
Tetsuo Handa | fdb8ebb | 2009-12-08 09:34:43 +0900 | [diff] [blame] | 325 | * |
| 326 | * Caller holds tomoyo_read_lock(). |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 327 | */ |
| 328 | int tomoyo_write_domain_initializer_policy(char *data, const bool is_not, |
| 329 | const bool is_delete) |
| 330 | { |
| 331 | char *cp = strstr(data, " from "); |
| 332 | |
| 333 | if (cp) { |
| 334 | *cp = '\0'; |
| 335 | return tomoyo_update_domain_initializer_entry(cp + 6, data, |
| 336 | is_not, |
| 337 | is_delete); |
| 338 | } |
| 339 | return tomoyo_update_domain_initializer_entry(NULL, data, is_not, |
| 340 | is_delete); |
| 341 | } |
| 342 | |
| 343 | /** |
| 344 | * tomoyo_is_domain_initializer - Check whether the given program causes domainname reinitialization. |
| 345 | * |
| 346 | * @domainname: The name of domain. |
| 347 | * @program: The name of program. |
| 348 | * @last_name: The last component of @domainname. |
| 349 | * |
| 350 | * Returns true if executing @program reinitializes domain transition, |
| 351 | * false otherwise. |
Tetsuo Handa | fdb8ebb | 2009-12-08 09:34:43 +0900 | [diff] [blame] | 352 | * |
| 353 | * Caller holds tomoyo_read_lock(). |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 354 | */ |
| 355 | static bool tomoyo_is_domain_initializer(const struct tomoyo_path_info * |
| 356 | domainname, |
| 357 | const struct tomoyo_path_info *program, |
| 358 | const struct tomoyo_path_info * |
| 359 | last_name) |
| 360 | { |
| 361 | struct tomoyo_domain_initializer_entry *ptr; |
| 362 | bool flag = false; |
| 363 | |
Tetsuo Handa | fdb8ebb | 2009-12-08 09:34:43 +0900 | [diff] [blame] | 364 | list_for_each_entry_rcu(ptr, &tomoyo_domain_initializer_list, list) { |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 365 | if (ptr->is_deleted) |
| 366 | continue; |
| 367 | if (ptr->domainname) { |
| 368 | if (!ptr->is_last_name) { |
| 369 | if (ptr->domainname != domainname) |
| 370 | continue; |
| 371 | } else { |
| 372 | if (tomoyo_pathcmp(ptr->domainname, last_name)) |
| 373 | continue; |
| 374 | } |
| 375 | } |
| 376 | if (tomoyo_pathcmp(ptr->program, program)) |
| 377 | continue; |
| 378 | if (ptr->is_not) { |
| 379 | flag = false; |
| 380 | break; |
| 381 | } |
| 382 | flag = true; |
| 383 | } |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 384 | return flag; |
| 385 | } |
| 386 | |
Tetsuo Handa | c3fa109 | 2009-06-08 12:37:39 +0900 | [diff] [blame] | 387 | /* |
| 388 | * tomoyo_domain_keeper_list is used for holding list of domainnames which |
| 389 | * suppresses domain transition. Normally, a domainname is monotonically |
| 390 | * getting longer. But sometimes, we want to suppress domain transition. |
| 391 | * It would be convenient for us that programs executed from a login session |
| 392 | * belong to the same domain. Thus, TOMOYO provides a way to suppress domain |
| 393 | * transition. |
| 394 | * |
| 395 | * An entry is added by |
| 396 | * |
| 397 | * # echo 'keep_domain <kernel> /usr/sbin/sshd /bin/bash' > \ |
| 398 | * /sys/kernel/security/tomoyo/exception_policy |
| 399 | * |
| 400 | * and is deleted by |
| 401 | * |
| 402 | * # echo 'delete keep_domain <kernel> /usr/sbin/sshd /bin/bash' > \ |
| 403 | * /sys/kernel/security/tomoyo/exception_policy |
| 404 | * |
| 405 | * and all entries are retrieved by |
| 406 | * |
| 407 | * # grep ^keep_domain /sys/kernel/security/tomoyo/exception_policy |
| 408 | * |
| 409 | * In the example above, any process which belongs to |
| 410 | * "<kernel> /usr/sbin/sshd /bin/bash" domain will remain in that domain, |
| 411 | * unless explicitly specified by "initialize_domain" or "no_keep_domain". |
| 412 | * |
| 413 | * You may specify a program using "from" keyword. |
| 414 | * "keep_domain /bin/pwd from <kernel> /usr/sbin/sshd /bin/bash" |
| 415 | * will cause "/bin/pwd" executed from "<kernel> /usr/sbin/sshd /bin/bash" |
| 416 | * domain to remain in "<kernel> /usr/sbin/sshd /bin/bash" domain. |
| 417 | * |
| 418 | * You may add "no_" prefix to "keep_domain". |
| 419 | * "keep_domain <kernel> /usr/sbin/sshd /bin/bash" and |
| 420 | * "no_keep_domain /usr/bin/passwd from <kernel> /usr/sbin/sshd /bin/bash" will |
| 421 | * cause "/usr/bin/passwd" to belong to |
| 422 | * "<kernel> /usr/sbin/sshd /bin/bash /usr/bin/passwd" domain, unless |
| 423 | * explicitly specified by "initialize_domain". |
| 424 | */ |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 425 | static LIST_HEAD(tomoyo_domain_keeper_list); |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 426 | |
| 427 | /** |
| 428 | * tomoyo_update_domain_keeper_entry - Update "struct tomoyo_domain_keeper_entry" list. |
| 429 | * |
| 430 | * @domainname: The name of domain. |
| 431 | * @program: The name of program. May be NULL. |
| 432 | * @is_not: True if it is "no_keep_domain" entry. |
| 433 | * @is_delete: True if it is a delete request. |
| 434 | * |
| 435 | * Returns 0 on success, negative value otherwise. |
Tetsuo Handa | fdb8ebb | 2009-12-08 09:34:43 +0900 | [diff] [blame] | 436 | * |
| 437 | * Caller holds tomoyo_read_lock(). |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 438 | */ |
| 439 | static int tomoyo_update_domain_keeper_entry(const char *domainname, |
| 440 | const char *program, |
| 441 | const bool is_not, |
| 442 | const bool is_delete) |
| 443 | { |
| 444 | struct tomoyo_domain_keeper_entry *new_entry; |
| 445 | struct tomoyo_domain_keeper_entry *ptr; |
| 446 | const struct tomoyo_path_info *saved_domainname; |
| 447 | const struct tomoyo_path_info *saved_program = NULL; |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 448 | int error = -ENOMEM; |
| 449 | bool is_last_name = false; |
| 450 | |
| 451 | if (!tomoyo_is_domain_def(domainname) && |
| 452 | tomoyo_is_correct_path(domainname, 1, -1, -1, __func__)) |
| 453 | is_last_name = true; |
| 454 | else if (!tomoyo_is_correct_domain(domainname, __func__)) |
| 455 | return -EINVAL; |
| 456 | if (program) { |
| 457 | if (!tomoyo_is_correct_path(program, 1, -1, -1, __func__)) |
| 458 | return -EINVAL; |
| 459 | saved_program = tomoyo_save_name(program); |
| 460 | if (!saved_program) |
| 461 | return -ENOMEM; |
| 462 | } |
| 463 | saved_domainname = tomoyo_save_name(domainname); |
| 464 | if (!saved_domainname) |
| 465 | return -ENOMEM; |
Tetsuo Handa | cd7bec6 | 2010-01-05 06:39:37 +0900 | [diff] [blame^] | 466 | new_entry = kmalloc(sizeof(*new_entry), GFP_KERNEL); |
Tetsuo Handa | f737d95 | 2010-01-03 21:16:32 +0900 | [diff] [blame] | 467 | mutex_lock(&tomoyo_policy_lock); |
Tetsuo Handa | fdb8ebb | 2009-12-08 09:34:43 +0900 | [diff] [blame] | 468 | list_for_each_entry_rcu(ptr, &tomoyo_domain_keeper_list, list) { |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 469 | if (ptr->is_not != is_not || |
| 470 | ptr->domainname != saved_domainname || |
| 471 | ptr->program != saved_program) |
| 472 | continue; |
| 473 | ptr->is_deleted = is_delete; |
| 474 | error = 0; |
| 475 | goto out; |
| 476 | } |
| 477 | if (is_delete) { |
| 478 | error = -ENOENT; |
| 479 | goto out; |
| 480 | } |
Tetsuo Handa | cd7bec6 | 2010-01-05 06:39:37 +0900 | [diff] [blame^] | 481 | if (!tomoyo_memory_ok(new_entry)) |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 482 | goto out; |
| 483 | new_entry->domainname = saved_domainname; |
| 484 | new_entry->program = saved_program; |
| 485 | new_entry->is_not = is_not; |
| 486 | new_entry->is_last_name = is_last_name; |
Tetsuo Handa | fdb8ebb | 2009-12-08 09:34:43 +0900 | [diff] [blame] | 487 | list_add_tail_rcu(&new_entry->list, &tomoyo_domain_keeper_list); |
Tetsuo Handa | cd7bec6 | 2010-01-05 06:39:37 +0900 | [diff] [blame^] | 488 | new_entry = NULL; |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 489 | error = 0; |
| 490 | out: |
Tetsuo Handa | f737d95 | 2010-01-03 21:16:32 +0900 | [diff] [blame] | 491 | mutex_unlock(&tomoyo_policy_lock); |
Tetsuo Handa | cd7bec6 | 2010-01-05 06:39:37 +0900 | [diff] [blame^] | 492 | kfree(new_entry); |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 493 | return error; |
| 494 | } |
| 495 | |
| 496 | /** |
| 497 | * tomoyo_write_domain_keeper_policy - Write "struct tomoyo_domain_keeper_entry" list. |
| 498 | * |
| 499 | * @data: String to parse. |
| 500 | * @is_not: True if it is "no_keep_domain" entry. |
| 501 | * @is_delete: True if it is a delete request. |
| 502 | * |
Tetsuo Handa | fdb8ebb | 2009-12-08 09:34:43 +0900 | [diff] [blame] | 503 | * Caller holds tomoyo_read_lock(). |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 504 | */ |
| 505 | int tomoyo_write_domain_keeper_policy(char *data, const bool is_not, |
| 506 | const bool is_delete) |
| 507 | { |
| 508 | char *cp = strstr(data, " from "); |
| 509 | |
| 510 | if (cp) { |
| 511 | *cp = '\0'; |
| 512 | return tomoyo_update_domain_keeper_entry(cp + 6, data, is_not, |
| 513 | is_delete); |
| 514 | } |
| 515 | return tomoyo_update_domain_keeper_entry(data, NULL, is_not, is_delete); |
| 516 | } |
| 517 | |
| 518 | /** |
| 519 | * tomoyo_read_domain_keeper_policy - Read "struct tomoyo_domain_keeper_entry" list. |
| 520 | * |
| 521 | * @head: Pointer to "struct tomoyo_io_buffer". |
| 522 | * |
| 523 | * Returns true on success, false otherwise. |
Tetsuo Handa | fdb8ebb | 2009-12-08 09:34:43 +0900 | [diff] [blame] | 524 | * |
| 525 | * Caller holds tomoyo_read_lock(). |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 526 | */ |
| 527 | bool tomoyo_read_domain_keeper_policy(struct tomoyo_io_buffer *head) |
| 528 | { |
| 529 | struct list_head *pos; |
Tetsuo Handa | 33043cb | 2009-02-13 16:00:58 +0900 | [diff] [blame] | 530 | bool done = true; |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 531 | |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 532 | list_for_each_cookie(pos, head->read_var2, |
| 533 | &tomoyo_domain_keeper_list) { |
| 534 | struct tomoyo_domain_keeper_entry *ptr; |
| 535 | const char *no; |
| 536 | const char *from = ""; |
| 537 | const char *program = ""; |
| 538 | |
| 539 | ptr = list_entry(pos, struct tomoyo_domain_keeper_entry, list); |
| 540 | if (ptr->is_deleted) |
| 541 | continue; |
| 542 | no = ptr->is_not ? "no_" : ""; |
| 543 | if (ptr->program) { |
| 544 | from = " from "; |
| 545 | program = ptr->program->name; |
| 546 | } |
Tetsuo Handa | 7d2948b | 2009-06-02 20:42:24 +0900 | [diff] [blame] | 547 | done = tomoyo_io_printf(head, |
| 548 | "%s" TOMOYO_KEYWORD_KEEP_DOMAIN |
| 549 | "%s%s%s\n", no, program, from, |
| 550 | ptr->domainname->name); |
| 551 | if (!done) |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 552 | break; |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 553 | } |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 554 | return done; |
| 555 | } |
| 556 | |
| 557 | /** |
| 558 | * tomoyo_is_domain_keeper - Check whether the given program causes domain transition suppression. |
| 559 | * |
| 560 | * @domainname: The name of domain. |
| 561 | * @program: The name of program. |
| 562 | * @last_name: The last component of @domainname. |
| 563 | * |
| 564 | * Returns true if executing @program supresses domain transition, |
| 565 | * false otherwise. |
Tetsuo Handa | fdb8ebb | 2009-12-08 09:34:43 +0900 | [diff] [blame] | 566 | * |
| 567 | * Caller holds tomoyo_read_lock(). |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 568 | */ |
| 569 | static bool tomoyo_is_domain_keeper(const struct tomoyo_path_info *domainname, |
| 570 | const struct tomoyo_path_info *program, |
| 571 | const struct tomoyo_path_info *last_name) |
| 572 | { |
| 573 | struct tomoyo_domain_keeper_entry *ptr; |
| 574 | bool flag = false; |
| 575 | |
Tetsuo Handa | fdb8ebb | 2009-12-08 09:34:43 +0900 | [diff] [blame] | 576 | list_for_each_entry_rcu(ptr, &tomoyo_domain_keeper_list, list) { |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 577 | if (ptr->is_deleted) |
| 578 | continue; |
| 579 | if (!ptr->is_last_name) { |
| 580 | if (ptr->domainname != domainname) |
| 581 | continue; |
| 582 | } else { |
| 583 | if (tomoyo_pathcmp(ptr->domainname, last_name)) |
| 584 | continue; |
| 585 | } |
| 586 | if (ptr->program && tomoyo_pathcmp(ptr->program, program)) |
| 587 | continue; |
| 588 | if (ptr->is_not) { |
| 589 | flag = false; |
| 590 | break; |
| 591 | } |
| 592 | flag = true; |
| 593 | } |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 594 | return flag; |
| 595 | } |
| 596 | |
Tetsuo Handa | c3fa109 | 2009-06-08 12:37:39 +0900 | [diff] [blame] | 597 | /* |
| 598 | * tomoyo_alias_list is used for holding list of symlink's pathnames which are |
| 599 | * allowed to be passed to an execve() request. Normally, the domainname which |
| 600 | * the current process will belong to after execve() succeeds is calculated |
| 601 | * using dereferenced pathnames. But some programs behave differently depending |
| 602 | * on the name passed to argv[0]. For busybox, calculating domainname using |
| 603 | * dereferenced pathnames will cause all programs in the busybox to belong to |
| 604 | * the same domain. Thus, TOMOYO provides a way to allow use of symlink's |
| 605 | * pathname for checking execve()'s permission and calculating domainname which |
| 606 | * the current process will belong to after execve() succeeds. |
| 607 | * |
| 608 | * An entry is added by |
| 609 | * |
| 610 | * # echo 'alias /bin/busybox /bin/cat' > \ |
| 611 | * /sys/kernel/security/tomoyo/exception_policy |
| 612 | * |
| 613 | * and is deleted by |
| 614 | * |
| 615 | * # echo 'delete alias /bin/busybox /bin/cat' > \ |
| 616 | * /sys/kernel/security/tomoyo/exception_policy |
| 617 | * |
| 618 | * and all entries are retrieved by |
| 619 | * |
| 620 | * # grep ^alias /sys/kernel/security/tomoyo/exception_policy |
| 621 | * |
| 622 | * In the example above, if /bin/cat is a symlink to /bin/busybox and execution |
| 623 | * of /bin/cat is requested, permission is checked for /bin/cat rather than |
| 624 | * /bin/busybox and domainname which the current process will belong to after |
| 625 | * execve() succeeds is calculated using /bin/cat rather than /bin/busybox . |
| 626 | */ |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 627 | static LIST_HEAD(tomoyo_alias_list); |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 628 | |
| 629 | /** |
| 630 | * tomoyo_update_alias_entry - Update "struct tomoyo_alias_entry" list. |
| 631 | * |
| 632 | * @original_name: The original program's real name. |
| 633 | * @aliased_name: The symbolic program's symbolic link's name. |
| 634 | * @is_delete: True if it is a delete request. |
| 635 | * |
| 636 | * Returns 0 on success, negative value otherwise. |
Tetsuo Handa | fdb8ebb | 2009-12-08 09:34:43 +0900 | [diff] [blame] | 637 | * |
| 638 | * Caller holds tomoyo_read_lock(). |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 639 | */ |
| 640 | static int tomoyo_update_alias_entry(const char *original_name, |
| 641 | const char *aliased_name, |
| 642 | const bool is_delete) |
| 643 | { |
| 644 | struct tomoyo_alias_entry *new_entry; |
| 645 | struct tomoyo_alias_entry *ptr; |
| 646 | const struct tomoyo_path_info *saved_original_name; |
| 647 | const struct tomoyo_path_info *saved_aliased_name; |
| 648 | int error = -ENOMEM; |
| 649 | |
| 650 | if (!tomoyo_is_correct_path(original_name, 1, -1, -1, __func__) || |
| 651 | !tomoyo_is_correct_path(aliased_name, 1, -1, -1, __func__)) |
| 652 | return -EINVAL; /* No patterns allowed. */ |
| 653 | saved_original_name = tomoyo_save_name(original_name); |
| 654 | saved_aliased_name = tomoyo_save_name(aliased_name); |
| 655 | if (!saved_original_name || !saved_aliased_name) |
| 656 | return -ENOMEM; |
Tetsuo Handa | cd7bec6 | 2010-01-05 06:39:37 +0900 | [diff] [blame^] | 657 | new_entry = kmalloc(sizeof(*new_entry), GFP_KERNEL); |
Tetsuo Handa | f737d95 | 2010-01-03 21:16:32 +0900 | [diff] [blame] | 658 | mutex_lock(&tomoyo_policy_lock); |
Tetsuo Handa | fdb8ebb | 2009-12-08 09:34:43 +0900 | [diff] [blame] | 659 | list_for_each_entry_rcu(ptr, &tomoyo_alias_list, list) { |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 660 | if (ptr->original_name != saved_original_name || |
| 661 | ptr->aliased_name != saved_aliased_name) |
| 662 | continue; |
| 663 | ptr->is_deleted = is_delete; |
| 664 | error = 0; |
| 665 | goto out; |
| 666 | } |
| 667 | if (is_delete) { |
| 668 | error = -ENOENT; |
| 669 | goto out; |
| 670 | } |
Tetsuo Handa | cd7bec6 | 2010-01-05 06:39:37 +0900 | [diff] [blame^] | 671 | if (!tomoyo_memory_ok(new_entry)) |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 672 | goto out; |
| 673 | new_entry->original_name = saved_original_name; |
| 674 | new_entry->aliased_name = saved_aliased_name; |
Tetsuo Handa | fdb8ebb | 2009-12-08 09:34:43 +0900 | [diff] [blame] | 675 | list_add_tail_rcu(&new_entry->list, &tomoyo_alias_list); |
Tetsuo Handa | cd7bec6 | 2010-01-05 06:39:37 +0900 | [diff] [blame^] | 676 | new_entry = NULL; |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 677 | error = 0; |
| 678 | out: |
Tetsuo Handa | f737d95 | 2010-01-03 21:16:32 +0900 | [diff] [blame] | 679 | mutex_unlock(&tomoyo_policy_lock); |
Tetsuo Handa | cd7bec6 | 2010-01-05 06:39:37 +0900 | [diff] [blame^] | 680 | kfree(new_entry); |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 681 | return error; |
| 682 | } |
| 683 | |
| 684 | /** |
| 685 | * tomoyo_read_alias_policy - Read "struct tomoyo_alias_entry" list. |
| 686 | * |
| 687 | * @head: Pointer to "struct tomoyo_io_buffer". |
| 688 | * |
| 689 | * Returns true on success, false otherwise. |
Tetsuo Handa | fdb8ebb | 2009-12-08 09:34:43 +0900 | [diff] [blame] | 690 | * |
| 691 | * Caller holds tomoyo_read_lock(). |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 692 | */ |
| 693 | bool tomoyo_read_alias_policy(struct tomoyo_io_buffer *head) |
| 694 | { |
| 695 | struct list_head *pos; |
| 696 | bool done = true; |
| 697 | |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 698 | list_for_each_cookie(pos, head->read_var2, &tomoyo_alias_list) { |
| 699 | struct tomoyo_alias_entry *ptr; |
| 700 | |
| 701 | ptr = list_entry(pos, struct tomoyo_alias_entry, list); |
| 702 | if (ptr->is_deleted) |
| 703 | continue; |
Tetsuo Handa | 7d2948b | 2009-06-02 20:42:24 +0900 | [diff] [blame] | 704 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_ALIAS "%s %s\n", |
| 705 | ptr->original_name->name, |
| 706 | ptr->aliased_name->name); |
| 707 | if (!done) |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 708 | break; |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 709 | } |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 710 | return done; |
| 711 | } |
| 712 | |
| 713 | /** |
| 714 | * tomoyo_write_alias_policy - Write "struct tomoyo_alias_entry" list. |
| 715 | * |
| 716 | * @data: String to parse. |
| 717 | * @is_delete: True if it is a delete request. |
| 718 | * |
| 719 | * Returns 0 on success, negative value otherwise. |
Tetsuo Handa | fdb8ebb | 2009-12-08 09:34:43 +0900 | [diff] [blame] | 720 | * |
| 721 | * Caller holds tomoyo_read_lock(). |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 722 | */ |
| 723 | int tomoyo_write_alias_policy(char *data, const bool is_delete) |
| 724 | { |
| 725 | char *cp = strchr(data, ' '); |
| 726 | |
| 727 | if (!cp) |
| 728 | return -EINVAL; |
| 729 | *cp++ = '\0'; |
| 730 | return tomoyo_update_alias_entry(data, cp, is_delete); |
| 731 | } |
| 732 | |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 733 | /** |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 734 | * tomoyo_find_or_assign_new_domain - Create a domain. |
| 735 | * |
| 736 | * @domainname: The name of domain. |
| 737 | * @profile: Profile number to assign if the domain was newly created. |
| 738 | * |
| 739 | * Returns pointer to "struct tomoyo_domain_info" on success, NULL otherwise. |
Tetsuo Handa | fdb8ebb | 2009-12-08 09:34:43 +0900 | [diff] [blame] | 740 | * |
| 741 | * Caller holds tomoyo_read_lock(). |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 742 | */ |
| 743 | struct tomoyo_domain_info *tomoyo_find_or_assign_new_domain(const char * |
| 744 | domainname, |
| 745 | const u8 profile) |
| 746 | { |
Tetsuo Handa | cd7bec6 | 2010-01-05 06:39:37 +0900 | [diff] [blame^] | 747 | struct tomoyo_domain_info *domain; |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 748 | const struct tomoyo_path_info *saved_domainname; |
| 749 | |
Tetsuo Handa | f737d95 | 2010-01-03 21:16:32 +0900 | [diff] [blame] | 750 | mutex_lock(&tomoyo_policy_lock); |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 751 | domain = tomoyo_find_domain(domainname); |
| 752 | if (domain) |
| 753 | goto out; |
| 754 | if (!tomoyo_is_correct_domain(domainname, __func__)) |
| 755 | goto out; |
| 756 | saved_domainname = tomoyo_save_name(domainname); |
| 757 | if (!saved_domainname) |
| 758 | goto out; |
Tetsuo Handa | cd7bec6 | 2010-01-05 06:39:37 +0900 | [diff] [blame^] | 759 | domain = kmalloc(sizeof(*domain), GFP_KERNEL); |
| 760 | if (tomoyo_memory_ok(domain)) { |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 761 | INIT_LIST_HEAD(&domain->acl_info_list); |
| 762 | domain->domainname = saved_domainname; |
| 763 | domain->profile = profile; |
Tetsuo Handa | fdb8ebb | 2009-12-08 09:34:43 +0900 | [diff] [blame] | 764 | list_add_tail_rcu(&domain->list, &tomoyo_domain_list); |
Tetsuo Handa | cd7bec6 | 2010-01-05 06:39:37 +0900 | [diff] [blame^] | 765 | } else { |
| 766 | kfree(domain); |
| 767 | domain = NULL; |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 768 | } |
Tetsuo Handa | cd7bec6 | 2010-01-05 06:39:37 +0900 | [diff] [blame^] | 769 | |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 770 | out: |
Tetsuo Handa | f737d95 | 2010-01-03 21:16:32 +0900 | [diff] [blame] | 771 | mutex_unlock(&tomoyo_policy_lock); |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 772 | return domain; |
| 773 | } |
| 774 | |
| 775 | /** |
| 776 | * tomoyo_find_next_domain - Find a domain. |
| 777 | * |
Tetsuo Handa | 56f8c9bc | 2009-06-19 14:13:27 +0900 | [diff] [blame] | 778 | * @bprm: Pointer to "struct linux_binprm". |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 779 | * |
| 780 | * Returns 0 on success, negative value otherwise. |
Tetsuo Handa | fdb8ebb | 2009-12-08 09:34:43 +0900 | [diff] [blame] | 781 | * |
| 782 | * Caller holds tomoyo_read_lock(). |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 783 | */ |
Tetsuo Handa | 56f8c9bc | 2009-06-19 14:13:27 +0900 | [diff] [blame] | 784 | int tomoyo_find_next_domain(struct linux_binprm *bprm) |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 785 | { |
| 786 | /* |
| 787 | * This function assumes that the size of buffer returned by |
| 788 | * tomoyo_realpath() = TOMOYO_MAX_PATHNAME_LEN. |
| 789 | */ |
| 790 | struct tomoyo_page_buffer *tmp = tomoyo_alloc(sizeof(*tmp)); |
| 791 | struct tomoyo_domain_info *old_domain = tomoyo_domain(); |
| 792 | struct tomoyo_domain_info *domain = NULL; |
| 793 | const char *old_domain_name = old_domain->domainname->name; |
| 794 | const char *original_name = bprm->filename; |
| 795 | char *new_domain_name = NULL; |
| 796 | char *real_program_name = NULL; |
| 797 | char *symlink_program_name = NULL; |
| 798 | const u8 mode = tomoyo_check_flags(old_domain, TOMOYO_MAC_FOR_FILE); |
| 799 | const bool is_enforce = (mode == 3); |
| 800 | int retval = -ENOMEM; |
| 801 | struct tomoyo_path_info r; /* real name */ |
| 802 | struct tomoyo_path_info s; /* symlink name */ |
| 803 | struct tomoyo_path_info l; /* last name */ |
| 804 | static bool initialized; |
| 805 | |
| 806 | if (!tmp) |
| 807 | goto out; |
| 808 | |
| 809 | if (!initialized) { |
| 810 | /* |
| 811 | * Built-in initializers. This is needed because policies are |
| 812 | * not loaded until starting /sbin/init. |
| 813 | */ |
| 814 | tomoyo_update_domain_initializer_entry(NULL, "/sbin/hotplug", |
| 815 | false, false); |
| 816 | tomoyo_update_domain_initializer_entry(NULL, "/sbin/modprobe", |
| 817 | false, false); |
| 818 | initialized = true; |
| 819 | } |
| 820 | |
| 821 | /* Get tomoyo_realpath of program. */ |
| 822 | retval = -ENOENT; |
| 823 | /* I hope tomoyo_realpath() won't fail with -ENOMEM. */ |
| 824 | real_program_name = tomoyo_realpath(original_name); |
| 825 | if (!real_program_name) |
| 826 | goto out; |
| 827 | /* Get tomoyo_realpath of symbolic link. */ |
| 828 | symlink_program_name = tomoyo_realpath_nofollow(original_name); |
| 829 | if (!symlink_program_name) |
| 830 | goto out; |
| 831 | |
| 832 | r.name = real_program_name; |
| 833 | tomoyo_fill_path_info(&r); |
| 834 | s.name = symlink_program_name; |
| 835 | tomoyo_fill_path_info(&s); |
| 836 | l.name = tomoyo_get_last_name(old_domain); |
| 837 | tomoyo_fill_path_info(&l); |
| 838 | |
| 839 | /* Check 'alias' directive. */ |
| 840 | if (tomoyo_pathcmp(&r, &s)) { |
| 841 | struct tomoyo_alias_entry *ptr; |
| 842 | /* Is this program allowed to be called via symbolic links? */ |
Tetsuo Handa | fdb8ebb | 2009-12-08 09:34:43 +0900 | [diff] [blame] | 843 | list_for_each_entry_rcu(ptr, &tomoyo_alias_list, list) { |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 844 | if (ptr->is_deleted || |
| 845 | tomoyo_pathcmp(&r, ptr->original_name) || |
| 846 | tomoyo_pathcmp(&s, ptr->aliased_name)) |
| 847 | continue; |
| 848 | memset(real_program_name, 0, TOMOYO_MAX_PATHNAME_LEN); |
| 849 | strncpy(real_program_name, ptr->aliased_name->name, |
| 850 | TOMOYO_MAX_PATHNAME_LEN - 1); |
| 851 | tomoyo_fill_path_info(&r); |
| 852 | break; |
| 853 | } |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 854 | } |
| 855 | |
| 856 | /* Check execute permission. */ |
Tetsuo Handa | bcb8697 | 2009-06-04 15:14:34 +0900 | [diff] [blame] | 857 | retval = tomoyo_check_exec_perm(old_domain, &r); |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 858 | if (retval < 0) |
| 859 | goto out; |
| 860 | |
| 861 | new_domain_name = tmp->buffer; |
| 862 | if (tomoyo_is_domain_initializer(old_domain->domainname, &r, &l)) { |
| 863 | /* Transit to the child of tomoyo_kernel_domain domain. */ |
| 864 | snprintf(new_domain_name, TOMOYO_MAX_PATHNAME_LEN + 1, |
| 865 | TOMOYO_ROOT_NAME " " "%s", real_program_name); |
| 866 | } else if (old_domain == &tomoyo_kernel_domain && |
| 867 | !tomoyo_policy_loaded) { |
| 868 | /* |
| 869 | * Needn't to transit from kernel domain before starting |
| 870 | * /sbin/init. But transit from kernel domain if executing |
| 871 | * initializers because they might start before /sbin/init. |
| 872 | */ |
| 873 | domain = old_domain; |
| 874 | } else if (tomoyo_is_domain_keeper(old_domain->domainname, &r, &l)) { |
| 875 | /* Keep current domain. */ |
| 876 | domain = old_domain; |
| 877 | } else { |
| 878 | /* Normal domain transition. */ |
| 879 | snprintf(new_domain_name, TOMOYO_MAX_PATHNAME_LEN + 1, |
| 880 | "%s %s", old_domain_name, real_program_name); |
| 881 | } |
| 882 | if (domain || strlen(new_domain_name) >= TOMOYO_MAX_PATHNAME_LEN) |
| 883 | goto done; |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 884 | domain = tomoyo_find_domain(new_domain_name); |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 885 | if (domain) |
| 886 | goto done; |
| 887 | if (is_enforce) |
| 888 | goto done; |
| 889 | domain = tomoyo_find_or_assign_new_domain(new_domain_name, |
| 890 | old_domain->profile); |
| 891 | done: |
| 892 | if (domain) |
| 893 | goto out; |
| 894 | printk(KERN_WARNING "TOMOYO-ERROR: Domain '%s' not defined.\n", |
| 895 | new_domain_name); |
| 896 | if (is_enforce) |
| 897 | retval = -EPERM; |
| 898 | else |
| 899 | tomoyo_set_domain_flag(old_domain, false, |
| 900 | TOMOYO_DOMAIN_FLAGS_TRANSITION_FAILED); |
| 901 | out: |
Tetsuo Handa | 56f8c9bc | 2009-06-19 14:13:27 +0900 | [diff] [blame] | 902 | if (!domain) |
| 903 | domain = old_domain; |
| 904 | bprm->cred->security = domain; |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 905 | tomoyo_free(real_program_name); |
| 906 | tomoyo_free(symlink_program_name); |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 907 | tomoyo_free(tmp); |
| 908 | return retval; |
| 909 | } |