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" |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 13 | #include <linux/binfmts.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 14 | #include <linux/slab.h> |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 15 | |
| 16 | /* Variables definitions.*/ |
| 17 | |
| 18 | /* The initial domain. */ |
| 19 | struct tomoyo_domain_info tomoyo_kernel_domain; |
| 20 | |
Tetsuo Handa | c3fa109 | 2009-06-08 12:37:39 +0900 | [diff] [blame] | 21 | /* |
| 22 | * tomoyo_domain_list is used for holding list of domains. |
| 23 | * The ->acl_info_list of "struct tomoyo_domain_info" is used for holding |
| 24 | * permissions (e.g. "allow_read /lib/libc-2.5.so") given to each domain. |
| 25 | * |
| 26 | * An entry is added by |
| 27 | * |
| 28 | * # ( echo "<kernel>"; echo "allow_execute /sbin/init" ) > \ |
| 29 | * /sys/kernel/security/tomoyo/domain_policy |
| 30 | * |
| 31 | * and is deleted by |
| 32 | * |
| 33 | * # ( echo "<kernel>"; echo "delete allow_execute /sbin/init" ) > \ |
| 34 | * /sys/kernel/security/tomoyo/domain_policy |
| 35 | * |
| 36 | * and all entries are retrieved by |
| 37 | * |
| 38 | * # cat /sys/kernel/security/tomoyo/domain_policy |
| 39 | * |
| 40 | * A domain is added by |
| 41 | * |
| 42 | * # echo "<kernel>" > /sys/kernel/security/tomoyo/domain_policy |
| 43 | * |
| 44 | * and is deleted by |
| 45 | * |
| 46 | * # echo "delete <kernel>" > /sys/kernel/security/tomoyo/domain_policy |
| 47 | * |
| 48 | * and all domains are retrieved by |
| 49 | * |
| 50 | * # grep '^<kernel>' /sys/kernel/security/tomoyo/domain_policy |
| 51 | * |
| 52 | * Normally, a domainname is monotonically getting longer because a domainname |
| 53 | * which the process will belong to if an execve() operation succeeds is |
| 54 | * defined as a concatenation of "current domainname" + "pathname passed to |
| 55 | * execve()". |
| 56 | * See tomoyo_domain_initializer_list and tomoyo_domain_keeper_list for |
| 57 | * exceptions. |
| 58 | */ |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 59 | LIST_HEAD(tomoyo_domain_list); |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 60 | |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 61 | /** |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 62 | * tomoyo_get_last_name - Get last component of a domainname. |
| 63 | * |
| 64 | * @domain: Pointer to "struct tomoyo_domain_info". |
| 65 | * |
| 66 | * Returns the last component of the domainname. |
| 67 | */ |
| 68 | const char *tomoyo_get_last_name(const struct tomoyo_domain_info *domain) |
| 69 | { |
| 70 | const char *cp0 = domain->domainname->name; |
| 71 | const char *cp1 = strrchr(cp0, ' '); |
| 72 | |
| 73 | if (cp1) |
| 74 | return cp1 + 1; |
| 75 | return cp0; |
| 76 | } |
| 77 | |
Tetsuo Handa | c3fa109 | 2009-06-08 12:37:39 +0900 | [diff] [blame] | 78 | /* |
| 79 | * tomoyo_domain_initializer_list is used for holding list of programs which |
| 80 | * triggers reinitialization of domainname. Normally, a domainname is |
| 81 | * monotonically getting longer. But sometimes, we restart daemon programs. |
| 82 | * It would be convenient for us that "a daemon started upon system boot" and |
| 83 | * "the daemon restarted from console" belong to the same domain. Thus, TOMOYO |
| 84 | * provides a way to shorten domainnames. |
| 85 | * |
| 86 | * An entry is added by |
| 87 | * |
| 88 | * # echo 'initialize_domain /usr/sbin/httpd' > \ |
| 89 | * /sys/kernel/security/tomoyo/exception_policy |
| 90 | * |
| 91 | * and is deleted by |
| 92 | * |
| 93 | * # echo 'delete initialize_domain /usr/sbin/httpd' > \ |
| 94 | * /sys/kernel/security/tomoyo/exception_policy |
| 95 | * |
| 96 | * and all entries are retrieved by |
| 97 | * |
| 98 | * # grep ^initialize_domain /sys/kernel/security/tomoyo/exception_policy |
| 99 | * |
| 100 | * In the example above, /usr/sbin/httpd will belong to |
| 101 | * "<kernel> /usr/sbin/httpd" domain. |
| 102 | * |
| 103 | * You may specify a domainname using "from" keyword. |
| 104 | * "initialize_domain /usr/sbin/httpd from <kernel> /etc/rc.d/init.d/httpd" |
| 105 | * will cause "/usr/sbin/httpd" executed from "<kernel> /etc/rc.d/init.d/httpd" |
| 106 | * domain to belong to "<kernel> /usr/sbin/httpd" domain. |
| 107 | * |
| 108 | * You may add "no_" prefix to "initialize_domain". |
| 109 | * "initialize_domain /usr/sbin/httpd" and |
| 110 | * "no_initialize_domain /usr/sbin/httpd from <kernel> /etc/rc.d/init.d/httpd" |
| 111 | * will cause "/usr/sbin/httpd" to belong to "<kernel> /usr/sbin/httpd" domain |
| 112 | * unless executed from "<kernel> /etc/rc.d/init.d/httpd" domain. |
| 113 | */ |
Tetsuo Handa | 847b173 | 2010-02-11 09:43:54 +0900 | [diff] [blame] | 114 | LIST_HEAD(tomoyo_domain_initializer_list); |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 115 | |
| 116 | /** |
| 117 | * tomoyo_update_domain_initializer_entry - Update "struct tomoyo_domain_initializer_entry" list. |
| 118 | * |
| 119 | * @domainname: The name of domain. May be NULL. |
| 120 | * @program: The name of program. |
| 121 | * @is_not: True if it is "no_initialize_domain" entry. |
| 122 | * @is_delete: True if it is a delete request. |
| 123 | * |
| 124 | * Returns 0 on success, negative value otherwise. |
Tetsuo Handa | fdb8ebb | 2009-12-08 09:34:43 +0900 | [diff] [blame] | 125 | * |
| 126 | * Caller holds tomoyo_read_lock(). |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 127 | */ |
| 128 | static int tomoyo_update_domain_initializer_entry(const char *domainname, |
| 129 | const char *program, |
| 130 | const bool is_not, |
| 131 | const bool is_delete) |
| 132 | { |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 133 | struct tomoyo_domain_initializer_entry *ptr; |
Tetsuo Handa | 9e4b50e | 2010-05-06 12:40:02 +0900 | [diff] [blame] | 134 | struct tomoyo_domain_initializer_entry e = { .is_not = is_not }; |
Tetsuo Handa | ca0b7df | 2010-02-07 20:23:59 +0900 | [diff] [blame] | 135 | int error = is_delete ? -ENOENT : -ENOMEM; |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 136 | |
Tetsuo Handa | 1708000 | 2010-02-16 21:14:48 +0900 | [diff] [blame] | 137 | if (!tomoyo_is_correct_path(program, 1, -1, -1)) |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 138 | return -EINVAL; /* No patterns allowed. */ |
| 139 | if (domainname) { |
| 140 | if (!tomoyo_is_domain_def(domainname) && |
Tetsuo Handa | 1708000 | 2010-02-16 21:14:48 +0900 | [diff] [blame] | 141 | tomoyo_is_correct_path(domainname, 1, -1, -1)) |
Tetsuo Handa | 9e4b50e | 2010-05-06 12:40:02 +0900 | [diff] [blame] | 142 | e.is_last_name = true; |
Tetsuo Handa | 1708000 | 2010-02-16 21:14:48 +0900 | [diff] [blame] | 143 | else if (!tomoyo_is_correct_domain(domainname)) |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 144 | return -EINVAL; |
Tetsuo Handa | 9e4b50e | 2010-05-06 12:40:02 +0900 | [diff] [blame] | 145 | e.domainname = tomoyo_get_name(domainname); |
| 146 | if (!e.domainname) |
Tetsuo Handa | ca0b7df | 2010-02-07 20:23:59 +0900 | [diff] [blame] | 147 | goto out; |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 148 | } |
Tetsuo Handa | 9e4b50e | 2010-05-06 12:40:02 +0900 | [diff] [blame] | 149 | e.program = tomoyo_get_name(program); |
| 150 | if (!e.program) |
Tetsuo Handa | ca0b7df | 2010-02-07 20:23:59 +0900 | [diff] [blame] | 151 | goto out; |
Tetsuo Handa | 2928238 | 2010-05-06 00:18:15 +0900 | [diff] [blame] | 152 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
| 153 | goto out; |
Tetsuo Handa | fdb8ebb | 2009-12-08 09:34:43 +0900 | [diff] [blame] | 154 | list_for_each_entry_rcu(ptr, &tomoyo_domain_initializer_list, list) { |
Tetsuo Handa | 9e4b50e | 2010-05-06 12:40:02 +0900 | [diff] [blame] | 155 | if (!tomoyo_is_same_domain_initializer_entry(ptr, &e)) |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 156 | continue; |
| 157 | ptr->is_deleted = is_delete; |
| 158 | error = 0; |
Tetsuo Handa | ca0b7df | 2010-02-07 20:23:59 +0900 | [diff] [blame] | 159 | break; |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 160 | } |
Tetsuo Handa | 9e4b50e | 2010-05-06 12:40:02 +0900 | [diff] [blame] | 161 | if (!is_delete && error) { |
| 162 | struct tomoyo_domain_initializer_entry *entry = |
| 163 | tomoyo_commit_ok(&e, sizeof(e)); |
| 164 | if (entry) { |
| 165 | list_add_tail_rcu(&entry->list, |
| 166 | &tomoyo_domain_initializer_list); |
| 167 | error = 0; |
| 168 | } |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 169 | } |
Tetsuo Handa | f737d95 | 2010-01-03 21:16:32 +0900 | [diff] [blame] | 170 | mutex_unlock(&tomoyo_policy_lock); |
Tetsuo Handa | ca0b7df | 2010-02-07 20:23:59 +0900 | [diff] [blame] | 171 | out: |
Tetsuo Handa | 9e4b50e | 2010-05-06 12:40:02 +0900 | [diff] [blame] | 172 | tomoyo_put_name(e.domainname); |
| 173 | tomoyo_put_name(e.program); |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 174 | return error; |
| 175 | } |
| 176 | |
| 177 | /** |
| 178 | * tomoyo_read_domain_initializer_policy - Read "struct tomoyo_domain_initializer_entry" list. |
| 179 | * |
| 180 | * @head: Pointer to "struct tomoyo_io_buffer". |
| 181 | * |
| 182 | * Returns true on success, false otherwise. |
Tetsuo Handa | fdb8ebb | 2009-12-08 09:34:43 +0900 | [diff] [blame] | 183 | * |
| 184 | * Caller holds tomoyo_read_lock(). |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 185 | */ |
| 186 | bool tomoyo_read_domain_initializer_policy(struct tomoyo_io_buffer *head) |
| 187 | { |
| 188 | struct list_head *pos; |
| 189 | bool done = true; |
| 190 | |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 191 | list_for_each_cookie(pos, head->read_var2, |
| 192 | &tomoyo_domain_initializer_list) { |
| 193 | const char *no; |
| 194 | const char *from = ""; |
| 195 | const char *domain = ""; |
| 196 | struct tomoyo_domain_initializer_entry *ptr; |
| 197 | ptr = list_entry(pos, struct tomoyo_domain_initializer_entry, |
| 198 | list); |
| 199 | if (ptr->is_deleted) |
| 200 | continue; |
| 201 | no = ptr->is_not ? "no_" : ""; |
| 202 | if (ptr->domainname) { |
| 203 | from = " from "; |
| 204 | domain = ptr->domainname->name; |
| 205 | } |
Tetsuo Handa | 7d2948b | 2009-06-02 20:42:24 +0900 | [diff] [blame] | 206 | done = tomoyo_io_printf(head, |
| 207 | "%s" TOMOYO_KEYWORD_INITIALIZE_DOMAIN |
| 208 | "%s%s%s\n", no, ptr->program->name, |
| 209 | from, domain); |
| 210 | if (!done) |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 211 | break; |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 212 | } |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 213 | return done; |
| 214 | } |
| 215 | |
| 216 | /** |
| 217 | * tomoyo_write_domain_initializer_policy - Write "struct tomoyo_domain_initializer_entry" list. |
| 218 | * |
| 219 | * @data: String to parse. |
| 220 | * @is_not: True if it is "no_initialize_domain" entry. |
| 221 | * @is_delete: True if it is a delete request. |
| 222 | * |
| 223 | * Returns 0 on success, negative value otherwise. |
Tetsuo Handa | fdb8ebb | 2009-12-08 09:34:43 +0900 | [diff] [blame] | 224 | * |
| 225 | * Caller holds tomoyo_read_lock(). |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 226 | */ |
| 227 | int tomoyo_write_domain_initializer_policy(char *data, const bool is_not, |
| 228 | const bool is_delete) |
| 229 | { |
| 230 | char *cp = strstr(data, " from "); |
| 231 | |
| 232 | if (cp) { |
| 233 | *cp = '\0'; |
| 234 | return tomoyo_update_domain_initializer_entry(cp + 6, data, |
| 235 | is_not, |
| 236 | is_delete); |
| 237 | } |
| 238 | return tomoyo_update_domain_initializer_entry(NULL, data, is_not, |
| 239 | is_delete); |
| 240 | } |
| 241 | |
| 242 | /** |
| 243 | * tomoyo_is_domain_initializer - Check whether the given program causes domainname reinitialization. |
| 244 | * |
| 245 | * @domainname: The name of domain. |
| 246 | * @program: The name of program. |
| 247 | * @last_name: The last component of @domainname. |
| 248 | * |
| 249 | * Returns true if executing @program reinitializes domain transition, |
| 250 | * false otherwise. |
Tetsuo Handa | fdb8ebb | 2009-12-08 09:34:43 +0900 | [diff] [blame] | 251 | * |
| 252 | * Caller holds tomoyo_read_lock(). |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 253 | */ |
| 254 | static bool tomoyo_is_domain_initializer(const struct tomoyo_path_info * |
| 255 | domainname, |
| 256 | const struct tomoyo_path_info *program, |
| 257 | const struct tomoyo_path_info * |
| 258 | last_name) |
| 259 | { |
| 260 | struct tomoyo_domain_initializer_entry *ptr; |
| 261 | bool flag = false; |
| 262 | |
Tetsuo Handa | fdb8ebb | 2009-12-08 09:34:43 +0900 | [diff] [blame] | 263 | list_for_each_entry_rcu(ptr, &tomoyo_domain_initializer_list, list) { |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 264 | if (ptr->is_deleted) |
| 265 | continue; |
| 266 | if (ptr->domainname) { |
| 267 | if (!ptr->is_last_name) { |
| 268 | if (ptr->domainname != domainname) |
| 269 | continue; |
| 270 | } else { |
| 271 | if (tomoyo_pathcmp(ptr->domainname, last_name)) |
| 272 | continue; |
| 273 | } |
| 274 | } |
| 275 | if (tomoyo_pathcmp(ptr->program, program)) |
| 276 | continue; |
| 277 | if (ptr->is_not) { |
| 278 | flag = false; |
| 279 | break; |
| 280 | } |
| 281 | flag = true; |
| 282 | } |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 283 | return flag; |
| 284 | } |
| 285 | |
Tetsuo Handa | c3fa109 | 2009-06-08 12:37:39 +0900 | [diff] [blame] | 286 | /* |
| 287 | * tomoyo_domain_keeper_list is used for holding list of domainnames which |
| 288 | * suppresses domain transition. Normally, a domainname is monotonically |
| 289 | * getting longer. But sometimes, we want to suppress domain transition. |
| 290 | * It would be convenient for us that programs executed from a login session |
| 291 | * belong to the same domain. Thus, TOMOYO provides a way to suppress domain |
| 292 | * transition. |
| 293 | * |
| 294 | * An entry is added by |
| 295 | * |
| 296 | * # echo 'keep_domain <kernel> /usr/sbin/sshd /bin/bash' > \ |
| 297 | * /sys/kernel/security/tomoyo/exception_policy |
| 298 | * |
| 299 | * and is deleted by |
| 300 | * |
| 301 | * # echo 'delete keep_domain <kernel> /usr/sbin/sshd /bin/bash' > \ |
| 302 | * /sys/kernel/security/tomoyo/exception_policy |
| 303 | * |
| 304 | * and all entries are retrieved by |
| 305 | * |
| 306 | * # grep ^keep_domain /sys/kernel/security/tomoyo/exception_policy |
| 307 | * |
| 308 | * In the example above, any process which belongs to |
| 309 | * "<kernel> /usr/sbin/sshd /bin/bash" domain will remain in that domain, |
| 310 | * unless explicitly specified by "initialize_domain" or "no_keep_domain". |
| 311 | * |
| 312 | * You may specify a program using "from" keyword. |
| 313 | * "keep_domain /bin/pwd from <kernel> /usr/sbin/sshd /bin/bash" |
| 314 | * will cause "/bin/pwd" executed from "<kernel> /usr/sbin/sshd /bin/bash" |
| 315 | * domain to remain in "<kernel> /usr/sbin/sshd /bin/bash" domain. |
| 316 | * |
| 317 | * You may add "no_" prefix to "keep_domain". |
| 318 | * "keep_domain <kernel> /usr/sbin/sshd /bin/bash" and |
| 319 | * "no_keep_domain /usr/bin/passwd from <kernel> /usr/sbin/sshd /bin/bash" will |
| 320 | * cause "/usr/bin/passwd" to belong to |
| 321 | * "<kernel> /usr/sbin/sshd /bin/bash /usr/bin/passwd" domain, unless |
| 322 | * explicitly specified by "initialize_domain". |
| 323 | */ |
Tetsuo Handa | 847b173 | 2010-02-11 09:43:54 +0900 | [diff] [blame] | 324 | LIST_HEAD(tomoyo_domain_keeper_list); |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 325 | |
| 326 | /** |
| 327 | * tomoyo_update_domain_keeper_entry - Update "struct tomoyo_domain_keeper_entry" list. |
| 328 | * |
| 329 | * @domainname: The name of domain. |
| 330 | * @program: The name of program. May be NULL. |
| 331 | * @is_not: True if it is "no_keep_domain" entry. |
| 332 | * @is_delete: True if it is a delete request. |
| 333 | * |
| 334 | * Returns 0 on success, negative value otherwise. |
Tetsuo Handa | fdb8ebb | 2009-12-08 09:34:43 +0900 | [diff] [blame] | 335 | * |
| 336 | * Caller holds tomoyo_read_lock(). |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 337 | */ |
| 338 | static int tomoyo_update_domain_keeper_entry(const char *domainname, |
| 339 | const char *program, |
| 340 | const bool is_not, |
| 341 | const bool is_delete) |
| 342 | { |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 343 | struct tomoyo_domain_keeper_entry *ptr; |
Tetsuo Handa | 9e4b50e | 2010-05-06 12:40:02 +0900 | [diff] [blame] | 344 | struct tomoyo_domain_keeper_entry e = { .is_not = is_not }; |
Tetsuo Handa | ca0b7df | 2010-02-07 20:23:59 +0900 | [diff] [blame] | 345 | int error = is_delete ? -ENOENT : -ENOMEM; |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 346 | |
| 347 | if (!tomoyo_is_domain_def(domainname) && |
Tetsuo Handa | 1708000 | 2010-02-16 21:14:48 +0900 | [diff] [blame] | 348 | tomoyo_is_correct_path(domainname, 1, -1, -1)) |
Tetsuo Handa | 9e4b50e | 2010-05-06 12:40:02 +0900 | [diff] [blame] | 349 | e.is_last_name = true; |
Tetsuo Handa | 1708000 | 2010-02-16 21:14:48 +0900 | [diff] [blame] | 350 | else if (!tomoyo_is_correct_domain(domainname)) |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 351 | return -EINVAL; |
| 352 | if (program) { |
Tetsuo Handa | 1708000 | 2010-02-16 21:14:48 +0900 | [diff] [blame] | 353 | if (!tomoyo_is_correct_path(program, 1, -1, -1)) |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 354 | return -EINVAL; |
Tetsuo Handa | 9e4b50e | 2010-05-06 12:40:02 +0900 | [diff] [blame] | 355 | e.program = tomoyo_get_name(program); |
| 356 | if (!e.program) |
Tetsuo Handa | ca0b7df | 2010-02-07 20:23:59 +0900 | [diff] [blame] | 357 | goto out; |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 358 | } |
Tetsuo Handa | 9e4b50e | 2010-05-06 12:40:02 +0900 | [diff] [blame] | 359 | e.domainname = tomoyo_get_name(domainname); |
| 360 | if (!e.domainname) |
Tetsuo Handa | ca0b7df | 2010-02-07 20:23:59 +0900 | [diff] [blame] | 361 | goto out; |
Tetsuo Handa | 2928238 | 2010-05-06 00:18:15 +0900 | [diff] [blame] | 362 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
| 363 | goto out; |
Tetsuo Handa | fdb8ebb | 2009-12-08 09:34:43 +0900 | [diff] [blame] | 364 | list_for_each_entry_rcu(ptr, &tomoyo_domain_keeper_list, list) { |
Tetsuo Handa | 9e4b50e | 2010-05-06 12:40:02 +0900 | [diff] [blame] | 365 | if (!tomoyo_is_same_domain_keeper_entry(ptr, &e)) |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 366 | continue; |
| 367 | ptr->is_deleted = is_delete; |
| 368 | error = 0; |
Tetsuo Handa | ca0b7df | 2010-02-07 20:23:59 +0900 | [diff] [blame] | 369 | break; |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 370 | } |
Tetsuo Handa | 9e4b50e | 2010-05-06 12:40:02 +0900 | [diff] [blame] | 371 | if (!is_delete && error) { |
| 372 | struct tomoyo_domain_keeper_entry *entry = |
| 373 | tomoyo_commit_ok(&e, sizeof(e)); |
| 374 | if (entry) { |
| 375 | list_add_tail_rcu(&entry->list, |
| 376 | &tomoyo_domain_keeper_list); |
| 377 | error = 0; |
| 378 | } |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 379 | } |
Tetsuo Handa | f737d95 | 2010-01-03 21:16:32 +0900 | [diff] [blame] | 380 | mutex_unlock(&tomoyo_policy_lock); |
Tetsuo Handa | ca0b7df | 2010-02-07 20:23:59 +0900 | [diff] [blame] | 381 | out: |
Tetsuo Handa | 9e4b50e | 2010-05-06 12:40:02 +0900 | [diff] [blame] | 382 | tomoyo_put_name(e.domainname); |
| 383 | tomoyo_put_name(e.program); |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 384 | return error; |
| 385 | } |
| 386 | |
| 387 | /** |
| 388 | * tomoyo_write_domain_keeper_policy - Write "struct tomoyo_domain_keeper_entry" list. |
| 389 | * |
| 390 | * @data: String to parse. |
| 391 | * @is_not: True if it is "no_keep_domain" entry. |
| 392 | * @is_delete: True if it is a delete request. |
| 393 | * |
Tetsuo Handa | fdb8ebb | 2009-12-08 09:34:43 +0900 | [diff] [blame] | 394 | * Caller holds tomoyo_read_lock(). |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 395 | */ |
| 396 | int tomoyo_write_domain_keeper_policy(char *data, const bool is_not, |
| 397 | const bool is_delete) |
| 398 | { |
| 399 | char *cp = strstr(data, " from "); |
| 400 | |
| 401 | if (cp) { |
| 402 | *cp = '\0'; |
| 403 | return tomoyo_update_domain_keeper_entry(cp + 6, data, is_not, |
| 404 | is_delete); |
| 405 | } |
| 406 | return tomoyo_update_domain_keeper_entry(data, NULL, is_not, is_delete); |
| 407 | } |
| 408 | |
| 409 | /** |
| 410 | * tomoyo_read_domain_keeper_policy - Read "struct tomoyo_domain_keeper_entry" list. |
| 411 | * |
| 412 | * @head: Pointer to "struct tomoyo_io_buffer". |
| 413 | * |
| 414 | * Returns true on success, false otherwise. |
Tetsuo Handa | fdb8ebb | 2009-12-08 09:34:43 +0900 | [diff] [blame] | 415 | * |
| 416 | * Caller holds tomoyo_read_lock(). |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 417 | */ |
| 418 | bool tomoyo_read_domain_keeper_policy(struct tomoyo_io_buffer *head) |
| 419 | { |
| 420 | struct list_head *pos; |
Tetsuo Handa | 33043cb | 2009-02-13 16:00:58 +0900 | [diff] [blame] | 421 | bool done = true; |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 422 | |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 423 | list_for_each_cookie(pos, head->read_var2, |
| 424 | &tomoyo_domain_keeper_list) { |
| 425 | struct tomoyo_domain_keeper_entry *ptr; |
| 426 | const char *no; |
| 427 | const char *from = ""; |
| 428 | const char *program = ""; |
| 429 | |
| 430 | ptr = list_entry(pos, struct tomoyo_domain_keeper_entry, list); |
| 431 | if (ptr->is_deleted) |
| 432 | continue; |
| 433 | no = ptr->is_not ? "no_" : ""; |
| 434 | if (ptr->program) { |
| 435 | from = " from "; |
| 436 | program = ptr->program->name; |
| 437 | } |
Tetsuo Handa | 7d2948b | 2009-06-02 20:42:24 +0900 | [diff] [blame] | 438 | done = tomoyo_io_printf(head, |
| 439 | "%s" TOMOYO_KEYWORD_KEEP_DOMAIN |
| 440 | "%s%s%s\n", no, program, from, |
| 441 | ptr->domainname->name); |
| 442 | if (!done) |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 443 | break; |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 444 | } |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 445 | return done; |
| 446 | } |
| 447 | |
| 448 | /** |
| 449 | * tomoyo_is_domain_keeper - Check whether the given program causes domain transition suppression. |
| 450 | * |
| 451 | * @domainname: The name of domain. |
| 452 | * @program: The name of program. |
| 453 | * @last_name: The last component of @domainname. |
| 454 | * |
| 455 | * Returns true if executing @program supresses domain transition, |
| 456 | * false otherwise. |
Tetsuo Handa | fdb8ebb | 2009-12-08 09:34:43 +0900 | [diff] [blame] | 457 | * |
| 458 | * Caller holds tomoyo_read_lock(). |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 459 | */ |
| 460 | static bool tomoyo_is_domain_keeper(const struct tomoyo_path_info *domainname, |
| 461 | const struct tomoyo_path_info *program, |
| 462 | const struct tomoyo_path_info *last_name) |
| 463 | { |
| 464 | struct tomoyo_domain_keeper_entry *ptr; |
| 465 | bool flag = false; |
| 466 | |
Tetsuo Handa | fdb8ebb | 2009-12-08 09:34:43 +0900 | [diff] [blame] | 467 | list_for_each_entry_rcu(ptr, &tomoyo_domain_keeper_list, list) { |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 468 | if (ptr->is_deleted) |
| 469 | continue; |
| 470 | if (!ptr->is_last_name) { |
| 471 | if (ptr->domainname != domainname) |
| 472 | continue; |
| 473 | } else { |
| 474 | if (tomoyo_pathcmp(ptr->domainname, last_name)) |
| 475 | continue; |
| 476 | } |
| 477 | if (ptr->program && tomoyo_pathcmp(ptr->program, program)) |
| 478 | continue; |
| 479 | if (ptr->is_not) { |
| 480 | flag = false; |
| 481 | break; |
| 482 | } |
| 483 | flag = true; |
| 484 | } |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 485 | return flag; |
| 486 | } |
| 487 | |
Tetsuo Handa | c3fa109 | 2009-06-08 12:37:39 +0900 | [diff] [blame] | 488 | /* |
| 489 | * tomoyo_alias_list is used for holding list of symlink's pathnames which are |
| 490 | * allowed to be passed to an execve() request. Normally, the domainname which |
| 491 | * the current process will belong to after execve() succeeds is calculated |
| 492 | * using dereferenced pathnames. But some programs behave differently depending |
| 493 | * on the name passed to argv[0]. For busybox, calculating domainname using |
| 494 | * dereferenced pathnames will cause all programs in the busybox to belong to |
| 495 | * the same domain. Thus, TOMOYO provides a way to allow use of symlink's |
| 496 | * pathname for checking execve()'s permission and calculating domainname which |
| 497 | * the current process will belong to after execve() succeeds. |
| 498 | * |
| 499 | * An entry is added by |
| 500 | * |
| 501 | * # echo 'alias /bin/busybox /bin/cat' > \ |
| 502 | * /sys/kernel/security/tomoyo/exception_policy |
| 503 | * |
| 504 | * and is deleted by |
| 505 | * |
| 506 | * # echo 'delete alias /bin/busybox /bin/cat' > \ |
| 507 | * /sys/kernel/security/tomoyo/exception_policy |
| 508 | * |
| 509 | * and all entries are retrieved by |
| 510 | * |
| 511 | * # grep ^alias /sys/kernel/security/tomoyo/exception_policy |
| 512 | * |
| 513 | * In the example above, if /bin/cat is a symlink to /bin/busybox and execution |
| 514 | * of /bin/cat is requested, permission is checked for /bin/cat rather than |
| 515 | * /bin/busybox and domainname which the current process will belong to after |
| 516 | * execve() succeeds is calculated using /bin/cat rather than /bin/busybox . |
| 517 | */ |
Tetsuo Handa | 847b173 | 2010-02-11 09:43:54 +0900 | [diff] [blame] | 518 | LIST_HEAD(tomoyo_alias_list); |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 519 | |
| 520 | /** |
| 521 | * tomoyo_update_alias_entry - Update "struct tomoyo_alias_entry" list. |
| 522 | * |
| 523 | * @original_name: The original program's real name. |
| 524 | * @aliased_name: The symbolic program's symbolic link's name. |
| 525 | * @is_delete: True if it is a delete request. |
| 526 | * |
| 527 | * Returns 0 on success, negative value otherwise. |
Tetsuo Handa | fdb8ebb | 2009-12-08 09:34:43 +0900 | [diff] [blame] | 528 | * |
| 529 | * Caller holds tomoyo_read_lock(). |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 530 | */ |
| 531 | static int tomoyo_update_alias_entry(const char *original_name, |
| 532 | const char *aliased_name, |
| 533 | const bool is_delete) |
| 534 | { |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 535 | struct tomoyo_alias_entry *ptr; |
Tetsuo Handa | 9e4b50e | 2010-05-06 12:40:02 +0900 | [diff] [blame] | 536 | struct tomoyo_alias_entry e = { }; |
Tetsuo Handa | ca0b7df | 2010-02-07 20:23:59 +0900 | [diff] [blame] | 537 | int error = is_delete ? -ENOENT : -ENOMEM; |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 538 | |
Tetsuo Handa | 1708000 | 2010-02-16 21:14:48 +0900 | [diff] [blame] | 539 | if (!tomoyo_is_correct_path(original_name, 1, -1, -1) || |
| 540 | !tomoyo_is_correct_path(aliased_name, 1, -1, -1)) |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 541 | return -EINVAL; /* No patterns allowed. */ |
Tetsuo Handa | 9e4b50e | 2010-05-06 12:40:02 +0900 | [diff] [blame] | 542 | e.original_name = tomoyo_get_name(original_name); |
| 543 | e.aliased_name = tomoyo_get_name(aliased_name); |
| 544 | if (!e.original_name || !e.aliased_name) |
Tetsuo Handa | ca0b7df | 2010-02-07 20:23:59 +0900 | [diff] [blame] | 545 | goto out; |
Tetsuo Handa | 2928238 | 2010-05-06 00:18:15 +0900 | [diff] [blame] | 546 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
| 547 | goto out; |
Tetsuo Handa | fdb8ebb | 2009-12-08 09:34:43 +0900 | [diff] [blame] | 548 | list_for_each_entry_rcu(ptr, &tomoyo_alias_list, list) { |
Tetsuo Handa | 9e4b50e | 2010-05-06 12:40:02 +0900 | [diff] [blame] | 549 | if (!tomoyo_is_same_alias_entry(ptr, &e)) |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 550 | continue; |
| 551 | ptr->is_deleted = is_delete; |
| 552 | error = 0; |
Tetsuo Handa | ca0b7df | 2010-02-07 20:23:59 +0900 | [diff] [blame] | 553 | break; |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 554 | } |
Tetsuo Handa | 9e4b50e | 2010-05-06 12:40:02 +0900 | [diff] [blame] | 555 | if (!is_delete && error) { |
| 556 | struct tomoyo_alias_entry *entry = |
| 557 | tomoyo_commit_ok(&e, sizeof(e)); |
| 558 | if (entry) { |
| 559 | list_add_tail_rcu(&entry->list, &tomoyo_alias_list); |
| 560 | error = 0; |
| 561 | } |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 562 | } |
Tetsuo Handa | f737d95 | 2010-01-03 21:16:32 +0900 | [diff] [blame] | 563 | mutex_unlock(&tomoyo_policy_lock); |
Tetsuo Handa | ca0b7df | 2010-02-07 20:23:59 +0900 | [diff] [blame] | 564 | out: |
Tetsuo Handa | 9e4b50e | 2010-05-06 12:40:02 +0900 | [diff] [blame] | 565 | tomoyo_put_name(e.original_name); |
| 566 | tomoyo_put_name(e.aliased_name); |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 567 | return error; |
| 568 | } |
| 569 | |
| 570 | /** |
| 571 | * tomoyo_read_alias_policy - Read "struct tomoyo_alias_entry" list. |
| 572 | * |
| 573 | * @head: Pointer to "struct tomoyo_io_buffer". |
| 574 | * |
| 575 | * Returns true on success, false otherwise. |
Tetsuo Handa | fdb8ebb | 2009-12-08 09:34:43 +0900 | [diff] [blame] | 576 | * |
| 577 | * Caller holds tomoyo_read_lock(). |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 578 | */ |
| 579 | bool tomoyo_read_alias_policy(struct tomoyo_io_buffer *head) |
| 580 | { |
| 581 | struct list_head *pos; |
| 582 | bool done = true; |
| 583 | |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 584 | list_for_each_cookie(pos, head->read_var2, &tomoyo_alias_list) { |
| 585 | struct tomoyo_alias_entry *ptr; |
| 586 | |
| 587 | ptr = list_entry(pos, struct tomoyo_alias_entry, list); |
| 588 | if (ptr->is_deleted) |
| 589 | continue; |
Tetsuo Handa | 7d2948b | 2009-06-02 20:42:24 +0900 | [diff] [blame] | 590 | done = tomoyo_io_printf(head, TOMOYO_KEYWORD_ALIAS "%s %s\n", |
| 591 | ptr->original_name->name, |
| 592 | ptr->aliased_name->name); |
| 593 | if (!done) |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 594 | break; |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 595 | } |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 596 | return done; |
| 597 | } |
| 598 | |
| 599 | /** |
| 600 | * tomoyo_write_alias_policy - Write "struct tomoyo_alias_entry" list. |
| 601 | * |
| 602 | * @data: String to parse. |
| 603 | * @is_delete: True if it is a delete request. |
| 604 | * |
| 605 | * Returns 0 on success, negative value otherwise. |
Tetsuo Handa | fdb8ebb | 2009-12-08 09:34:43 +0900 | [diff] [blame] | 606 | * |
| 607 | * Caller holds tomoyo_read_lock(). |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 608 | */ |
| 609 | int tomoyo_write_alias_policy(char *data, const bool is_delete) |
| 610 | { |
| 611 | char *cp = strchr(data, ' '); |
| 612 | |
| 613 | if (!cp) |
| 614 | return -EINVAL; |
| 615 | *cp++ = '\0'; |
| 616 | return tomoyo_update_alias_entry(data, cp, is_delete); |
| 617 | } |
| 618 | |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 619 | /** |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 620 | * tomoyo_find_or_assign_new_domain - Create a domain. |
| 621 | * |
| 622 | * @domainname: The name of domain. |
| 623 | * @profile: Profile number to assign if the domain was newly created. |
| 624 | * |
| 625 | * Returns pointer to "struct tomoyo_domain_info" on success, NULL otherwise. |
Tetsuo Handa | fdb8ebb | 2009-12-08 09:34:43 +0900 | [diff] [blame] | 626 | * |
| 627 | * Caller holds tomoyo_read_lock(). |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 628 | */ |
| 629 | struct tomoyo_domain_info *tomoyo_find_or_assign_new_domain(const char * |
| 630 | domainname, |
| 631 | const u8 profile) |
| 632 | { |
Tetsuo Handa | ca0b7df | 2010-02-07 20:23:59 +0900 | [diff] [blame] | 633 | struct tomoyo_domain_info *entry; |
Tetsuo Handa | 2928238 | 2010-05-06 00:18:15 +0900 | [diff] [blame] | 634 | struct tomoyo_domain_info *domain = NULL; |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 635 | const struct tomoyo_path_info *saved_domainname; |
Tetsuo Handa | ca0b7df | 2010-02-07 20:23:59 +0900 | [diff] [blame] | 636 | bool found = false; |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 637 | |
Tetsuo Handa | 1708000 | 2010-02-16 21:14:48 +0900 | [diff] [blame] | 638 | if (!tomoyo_is_correct_domain(domainname)) |
Tetsuo Handa | ca0b7df | 2010-02-07 20:23:59 +0900 | [diff] [blame] | 639 | return NULL; |
Tetsuo Handa | bf24fb0 | 2010-02-11 09:41:58 +0900 | [diff] [blame] | 640 | saved_domainname = tomoyo_get_name(domainname); |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 641 | if (!saved_domainname) |
Tetsuo Handa | ca0b7df | 2010-02-07 20:23:59 +0900 | [diff] [blame] | 642 | return NULL; |
Tetsuo Handa | 4e5d6f7 | 2010-04-28 14:17:42 +0900 | [diff] [blame] | 643 | entry = kzalloc(sizeof(*entry), GFP_NOFS); |
Tetsuo Handa | 2928238 | 2010-05-06 00:18:15 +0900 | [diff] [blame] | 644 | if (mutex_lock_interruptible(&tomoyo_policy_lock)) |
| 645 | goto out; |
Tetsuo Handa | ca0b7df | 2010-02-07 20:23:59 +0900 | [diff] [blame] | 646 | list_for_each_entry_rcu(domain, &tomoyo_domain_list, list) { |
| 647 | if (domain->is_deleted || |
| 648 | tomoyo_pathcmp(saved_domainname, domain->domainname)) |
| 649 | continue; |
| 650 | found = true; |
| 651 | break; |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 652 | } |
Tetsuo Handa | ca0b7df | 2010-02-07 20:23:59 +0900 | [diff] [blame] | 653 | if (!found && tomoyo_memory_ok(entry)) { |
| 654 | INIT_LIST_HEAD(&entry->acl_info_list); |
| 655 | entry->domainname = saved_domainname; |
Tetsuo Handa | bf24fb0 | 2010-02-11 09:41:58 +0900 | [diff] [blame] | 656 | saved_domainname = NULL; |
Tetsuo Handa | ca0b7df | 2010-02-07 20:23:59 +0900 | [diff] [blame] | 657 | entry->profile = profile; |
| 658 | list_add_tail_rcu(&entry->list, &tomoyo_domain_list); |
| 659 | domain = entry; |
| 660 | entry = NULL; |
| 661 | found = true; |
| 662 | } |
Tetsuo Handa | f737d95 | 2010-01-03 21:16:32 +0900 | [diff] [blame] | 663 | mutex_unlock(&tomoyo_policy_lock); |
Tetsuo Handa | 2928238 | 2010-05-06 00:18:15 +0900 | [diff] [blame] | 664 | out: |
Tetsuo Handa | bf24fb0 | 2010-02-11 09:41:58 +0900 | [diff] [blame] | 665 | tomoyo_put_name(saved_domainname); |
Tetsuo Handa | ca0b7df | 2010-02-07 20:23:59 +0900 | [diff] [blame] | 666 | kfree(entry); |
| 667 | return found ? domain : NULL; |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 668 | } |
| 669 | |
| 670 | /** |
| 671 | * tomoyo_find_next_domain - Find a domain. |
| 672 | * |
Tetsuo Handa | 56f8c9bc | 2009-06-19 14:13:27 +0900 | [diff] [blame] | 673 | * @bprm: Pointer to "struct linux_binprm". |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 674 | * |
| 675 | * Returns 0 on success, negative value otherwise. |
Tetsuo Handa | fdb8ebb | 2009-12-08 09:34:43 +0900 | [diff] [blame] | 676 | * |
| 677 | * Caller holds tomoyo_read_lock(). |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 678 | */ |
Tetsuo Handa | 56f8c9bc | 2009-06-19 14:13:27 +0900 | [diff] [blame] | 679 | int tomoyo_find_next_domain(struct linux_binprm *bprm) |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 680 | { |
| 681 | /* |
| 682 | * This function assumes that the size of buffer returned by |
| 683 | * tomoyo_realpath() = TOMOYO_MAX_PATHNAME_LEN. |
| 684 | */ |
Tetsuo Handa | 4e5d6f7 | 2010-04-28 14:17:42 +0900 | [diff] [blame] | 685 | struct tomoyo_page_buffer *tmp = kzalloc(sizeof(*tmp), GFP_NOFS); |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 686 | struct tomoyo_domain_info *old_domain = tomoyo_domain(); |
| 687 | struct tomoyo_domain_info *domain = NULL; |
| 688 | const char *old_domain_name = old_domain->domainname->name; |
| 689 | const char *original_name = bprm->filename; |
| 690 | char *new_domain_name = NULL; |
| 691 | char *real_program_name = NULL; |
| 692 | char *symlink_program_name = NULL; |
| 693 | const u8 mode = tomoyo_check_flags(old_domain, TOMOYO_MAC_FOR_FILE); |
Tetsuo Handa | cb0abe6 | 2010-05-17 10:08:05 +0900 | [diff] [blame^] | 694 | const bool is_enforce = (mode == TOMOYO_CONFIG_ENFORCING); |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 695 | int retval = -ENOMEM; |
| 696 | struct tomoyo_path_info r; /* real name */ |
| 697 | struct tomoyo_path_info s; /* symlink name */ |
| 698 | struct tomoyo_path_info l; /* last name */ |
| 699 | static bool initialized; |
| 700 | |
| 701 | if (!tmp) |
| 702 | goto out; |
| 703 | |
| 704 | if (!initialized) { |
| 705 | /* |
| 706 | * Built-in initializers. This is needed because policies are |
| 707 | * not loaded until starting /sbin/init. |
| 708 | */ |
| 709 | tomoyo_update_domain_initializer_entry(NULL, "/sbin/hotplug", |
| 710 | false, false); |
| 711 | tomoyo_update_domain_initializer_entry(NULL, "/sbin/modprobe", |
| 712 | false, false); |
| 713 | initialized = true; |
| 714 | } |
| 715 | |
| 716 | /* Get tomoyo_realpath of program. */ |
| 717 | retval = -ENOENT; |
| 718 | /* I hope tomoyo_realpath() won't fail with -ENOMEM. */ |
| 719 | real_program_name = tomoyo_realpath(original_name); |
| 720 | if (!real_program_name) |
| 721 | goto out; |
| 722 | /* Get tomoyo_realpath of symbolic link. */ |
| 723 | symlink_program_name = tomoyo_realpath_nofollow(original_name); |
| 724 | if (!symlink_program_name) |
| 725 | goto out; |
| 726 | |
| 727 | r.name = real_program_name; |
| 728 | tomoyo_fill_path_info(&r); |
| 729 | s.name = symlink_program_name; |
| 730 | tomoyo_fill_path_info(&s); |
| 731 | l.name = tomoyo_get_last_name(old_domain); |
| 732 | tomoyo_fill_path_info(&l); |
| 733 | |
| 734 | /* Check 'alias' directive. */ |
| 735 | if (tomoyo_pathcmp(&r, &s)) { |
| 736 | struct tomoyo_alias_entry *ptr; |
| 737 | /* Is this program allowed to be called via symbolic links? */ |
Tetsuo Handa | fdb8ebb | 2009-12-08 09:34:43 +0900 | [diff] [blame] | 738 | list_for_each_entry_rcu(ptr, &tomoyo_alias_list, list) { |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 739 | if (ptr->is_deleted || |
| 740 | tomoyo_pathcmp(&r, ptr->original_name) || |
| 741 | tomoyo_pathcmp(&s, ptr->aliased_name)) |
| 742 | continue; |
| 743 | memset(real_program_name, 0, TOMOYO_MAX_PATHNAME_LEN); |
| 744 | strncpy(real_program_name, ptr->aliased_name->name, |
| 745 | TOMOYO_MAX_PATHNAME_LEN - 1); |
| 746 | tomoyo_fill_path_info(&r); |
| 747 | break; |
| 748 | } |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 749 | } |
| 750 | |
| 751 | /* Check execute permission. */ |
Tetsuo Handa | bcb8697 | 2009-06-04 15:14:34 +0900 | [diff] [blame] | 752 | retval = tomoyo_check_exec_perm(old_domain, &r); |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 753 | if (retval < 0) |
| 754 | goto out; |
| 755 | |
| 756 | new_domain_name = tmp->buffer; |
| 757 | if (tomoyo_is_domain_initializer(old_domain->domainname, &r, &l)) { |
| 758 | /* Transit to the child of tomoyo_kernel_domain domain. */ |
| 759 | snprintf(new_domain_name, TOMOYO_MAX_PATHNAME_LEN + 1, |
| 760 | TOMOYO_ROOT_NAME " " "%s", real_program_name); |
| 761 | } else if (old_domain == &tomoyo_kernel_domain && |
| 762 | !tomoyo_policy_loaded) { |
| 763 | /* |
| 764 | * Needn't to transit from kernel domain before starting |
| 765 | * /sbin/init. But transit from kernel domain if executing |
| 766 | * initializers because they might start before /sbin/init. |
| 767 | */ |
| 768 | domain = old_domain; |
| 769 | } else if (tomoyo_is_domain_keeper(old_domain->domainname, &r, &l)) { |
| 770 | /* Keep current domain. */ |
| 771 | domain = old_domain; |
| 772 | } else { |
| 773 | /* Normal domain transition. */ |
| 774 | snprintf(new_domain_name, TOMOYO_MAX_PATHNAME_LEN + 1, |
| 775 | "%s %s", old_domain_name, real_program_name); |
| 776 | } |
| 777 | if (domain || strlen(new_domain_name) >= TOMOYO_MAX_PATHNAME_LEN) |
| 778 | goto done; |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 779 | domain = tomoyo_find_domain(new_domain_name); |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 780 | if (domain) |
| 781 | goto done; |
| 782 | if (is_enforce) |
| 783 | goto done; |
| 784 | domain = tomoyo_find_or_assign_new_domain(new_domain_name, |
| 785 | old_domain->profile); |
| 786 | done: |
| 787 | if (domain) |
| 788 | goto out; |
| 789 | printk(KERN_WARNING "TOMOYO-ERROR: Domain '%s' not defined.\n", |
| 790 | new_domain_name); |
| 791 | if (is_enforce) |
| 792 | retval = -EPERM; |
| 793 | else |
Tetsuo Handa | ea13ddb | 2010-02-03 06:43:06 +0900 | [diff] [blame] | 794 | old_domain->transition_failed = true; |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 795 | out: |
Tetsuo Handa | 56f8c9bc | 2009-06-19 14:13:27 +0900 | [diff] [blame] | 796 | if (!domain) |
| 797 | domain = old_domain; |
Tetsuo Handa | ec8e6a4 | 2010-02-11 09:43:20 +0900 | [diff] [blame] | 798 | /* Update reference count on "struct tomoyo_domain_info". */ |
| 799 | atomic_inc(&domain->users); |
Tetsuo Handa | 56f8c9bc | 2009-06-19 14:13:27 +0900 | [diff] [blame] | 800 | bprm->cred->security = domain; |
Tetsuo Handa | 8e2d39a | 2010-01-26 20:45:27 +0900 | [diff] [blame] | 801 | kfree(real_program_name); |
| 802 | kfree(symlink_program_name); |
| 803 | kfree(tmp); |
Kentaro Takeda | 26a2a1c | 2009-02-05 17:18:15 +0900 | [diff] [blame] | 804 | return retval; |
| 805 | } |