| 1 |
/* |
| 2 |
* security/ccsecurity/policy_io.c |
| 3 |
* |
| 4 |
* Copyright (C) 2005-2010 NTT DATA CORPORATION |
| 5 |
* |
| 6 |
* Version: 1.7.2+ 2010/06/04 |
| 7 |
* |
| 8 |
* This file is applicable to both 2.4.30 and 2.6.11 and later. |
| 9 |
* See README.ccs for ChangeLog. |
| 10 |
* |
| 11 |
*/ |
| 12 |
|
| 13 |
#include "internal.h" |
| 14 |
|
| 15 |
static struct ccs_profile ccs_default_profile = { |
| 16 |
.learning = &ccs_default_profile.preference, |
| 17 |
.permissive = &ccs_default_profile.preference, |
| 18 |
.enforcing = &ccs_default_profile.preference, |
| 19 |
.audit = &ccs_default_profile.preference, |
| 20 |
#ifdef CONFIG_CCSECURITY_AUDIT |
| 21 |
.preference.audit_max_grant_log = CONFIG_CCSECURITY_MAX_GRANT_LOG, |
| 22 |
.preference.audit_max_reject_log = CONFIG_CCSECURITY_MAX_REJECT_LOG, |
| 23 |
#endif |
| 24 |
.preference.audit_task_info = true, |
| 25 |
.preference.audit_path_info = true, |
| 26 |
.preference.enforcing_penalty = 0, |
| 27 |
.preference.enforcing_verbose = true, |
| 28 |
.preference.learning_max_entry = CONFIG_CCSECURITY_MAX_ACCEPT_ENTRY, |
| 29 |
.preference.learning_verbose = false, |
| 30 |
.preference.learning_exec_realpath = true, |
| 31 |
.preference.learning_exec_argv0 = true, |
| 32 |
.preference.learning_symlink_target = true, |
| 33 |
.preference.permissive_verbose = true |
| 34 |
}; |
| 35 |
|
| 36 |
/* Profile version. Currently only 20090903 is defined. */ |
| 37 |
static unsigned int ccs_profile_version; |
| 38 |
|
| 39 |
/* Profile table. Memory is allocated as needed. */ |
| 40 |
static struct ccs_profile *ccs_profile_ptr[CCS_MAX_PROFILES]; |
| 41 |
|
| 42 |
/* String table for functionality that takes 4 modes. */ |
| 43 |
static const char *ccs_mode[CCS_CONFIG_MAX_MODE] = { |
| 44 |
[CCS_CONFIG_DISABLED] = "disabled", |
| 45 |
[CCS_CONFIG_LEARNING] = "learning", |
| 46 |
[CCS_CONFIG_PERMISSIVE] = "permissive", |
| 47 |
[CCS_CONFIG_ENFORCING] = "enforcing" |
| 48 |
}; |
| 49 |
|
| 50 |
/* String table for /proc/ccs/profile */ |
| 51 |
static const char *ccs_mac_keywords[CCS_MAX_MAC_INDEX + |
| 52 |
CCS_MAX_CAPABILITY_INDEX + |
| 53 |
CCS_MAX_MAC_CATEGORY_INDEX] = { |
| 54 |
[CCS_MAC_FILE_EXECUTE] |
| 55 |
= "file::execute", |
| 56 |
[CCS_MAC_FILE_OPEN] |
| 57 |
= "file::open", |
| 58 |
[CCS_MAC_FILE_CREATE] |
| 59 |
= "file::create", |
| 60 |
[CCS_MAC_FILE_UNLINK] |
| 61 |
= "file::unlink", |
| 62 |
[CCS_MAC_FILE_MKDIR] |
| 63 |
= "file::mkdir", |
| 64 |
[CCS_MAC_FILE_RMDIR] |
| 65 |
= "file::rmdir", |
| 66 |
[CCS_MAC_FILE_MKFIFO] |
| 67 |
= "file::mkfifo", |
| 68 |
[CCS_MAC_FILE_MKSOCK] |
| 69 |
= "file::mksock", |
| 70 |
[CCS_MAC_FILE_TRUNCATE] |
| 71 |
= "file::truncate", |
| 72 |
[CCS_MAC_FILE_SYMLINK] |
| 73 |
= "file::symlink", |
| 74 |
[CCS_MAC_FILE_REWRITE] |
| 75 |
= "file::rewrite", |
| 76 |
[CCS_MAC_FILE_MKBLOCK] |
| 77 |
= "file::mkblock", |
| 78 |
[CCS_MAC_FILE_MKCHAR] |
| 79 |
= "file::mkchar", |
| 80 |
[CCS_MAC_FILE_LINK] |
| 81 |
= "file::link", |
| 82 |
[CCS_MAC_FILE_RENAME] |
| 83 |
= "file::rename", |
| 84 |
[CCS_MAC_FILE_CHMOD] |
| 85 |
= "file::chmod", |
| 86 |
[CCS_MAC_FILE_CHOWN] |
| 87 |
= "file::chown", |
| 88 |
[CCS_MAC_FILE_CHGRP] |
| 89 |
= "file::chgrp", |
| 90 |
[CCS_MAC_FILE_IOCTL] |
| 91 |
= "file::ioctl", |
| 92 |
[CCS_MAC_FILE_CHROOT] |
| 93 |
= "file::chroot", |
| 94 |
[CCS_MAC_FILE_MOUNT] |
| 95 |
= "file::mount", |
| 96 |
[CCS_MAC_FILE_UMOUNT] |
| 97 |
= "file::umount", |
| 98 |
[CCS_MAC_FILE_PIVOT_ROOT] |
| 99 |
= "file::pivot_root", |
| 100 |
[CCS_MAC_FILE_TRANSIT] |
| 101 |
= "file::transit", |
| 102 |
[CCS_MAC_ENVIRON] |
| 103 |
= "misc::env", |
| 104 |
[CCS_MAC_NETWORK_UDP_BIND] |
| 105 |
= "network::inet_udp_bind", |
| 106 |
[CCS_MAC_NETWORK_UDP_CONNECT] |
| 107 |
= "network::inet_udp_connect", |
| 108 |
[CCS_MAC_NETWORK_TCP_BIND] |
| 109 |
= "network::inet_tcp_bind", |
| 110 |
[CCS_MAC_NETWORK_TCP_LISTEN] |
| 111 |
= "network::inet_tcp_listen", |
| 112 |
[CCS_MAC_NETWORK_TCP_CONNECT] |
| 113 |
= "network::inet_tcp_connect", |
| 114 |
[CCS_MAC_NETWORK_TCP_ACCEPT] |
| 115 |
= "network::inet_tcp_accept", |
| 116 |
[CCS_MAC_NETWORK_RAW_BIND] |
| 117 |
= "network::inet_raw_bind", |
| 118 |
[CCS_MAC_NETWORK_RAW_CONNECT] |
| 119 |
= "network::inet_raw_connect", |
| 120 |
[CCS_MAC_SIGNAL] |
| 121 |
= "ipc::signal", |
| 122 |
[CCS_MAX_MAC_INDEX + CCS_INET_STREAM_SOCKET_CREATE] |
| 123 |
= "capability::inet_tcp_create", |
| 124 |
[CCS_MAX_MAC_INDEX + CCS_INET_STREAM_SOCKET_LISTEN] |
| 125 |
= "capability::inet_tcp_listen", |
| 126 |
[CCS_MAX_MAC_INDEX + CCS_INET_STREAM_SOCKET_CONNECT] |
| 127 |
= "capability::inet_tcp_connect", |
| 128 |
[CCS_MAX_MAC_INDEX + CCS_USE_INET_DGRAM_SOCKET] |
| 129 |
= "capability::use_inet_udp", |
| 130 |
[CCS_MAX_MAC_INDEX + CCS_USE_INET_RAW_SOCKET] |
| 131 |
= "capability::use_inet_ip", |
| 132 |
[CCS_MAX_MAC_INDEX + CCS_USE_ROUTE_SOCKET] |
| 133 |
= "capability::use_route", |
| 134 |
[CCS_MAX_MAC_INDEX + CCS_USE_PACKET_SOCKET] |
| 135 |
= "capability::use_packet", |
| 136 |
[CCS_MAX_MAC_INDEX + CCS_SYS_MOUNT] |
| 137 |
= "capability::SYS_MOUNT", |
| 138 |
[CCS_MAX_MAC_INDEX + CCS_SYS_UMOUNT] |
| 139 |
= "capability::SYS_UMOUNT", |
| 140 |
[CCS_MAX_MAC_INDEX + CCS_SYS_REBOOT] |
| 141 |
= "capability::SYS_REBOOT", |
| 142 |
[CCS_MAX_MAC_INDEX + CCS_SYS_CHROOT] |
| 143 |
= "capability::SYS_CHROOT", |
| 144 |
[CCS_MAX_MAC_INDEX + CCS_SYS_KILL] |
| 145 |
= "capability::SYS_KILL", |
| 146 |
[CCS_MAX_MAC_INDEX + CCS_SYS_VHANGUP] |
| 147 |
= "capability::SYS_VHANGUP", |
| 148 |
[CCS_MAX_MAC_INDEX + CCS_SYS_SETTIME] |
| 149 |
= "capability::SYS_TIME", |
| 150 |
[CCS_MAX_MAC_INDEX + CCS_SYS_NICE] |
| 151 |
= "capability::SYS_NICE", |
| 152 |
[CCS_MAX_MAC_INDEX + CCS_SYS_SETHOSTNAME] |
| 153 |
= "capability::SYS_SETHOSTNAME", |
| 154 |
[CCS_MAX_MAC_INDEX + CCS_USE_KERNEL_MODULE] |
| 155 |
= "capability::use_kernel_module", |
| 156 |
[CCS_MAX_MAC_INDEX + CCS_CREATE_FIFO] |
| 157 |
= "capability::create_fifo", |
| 158 |
[CCS_MAX_MAC_INDEX + CCS_CREATE_BLOCK_DEV] |
| 159 |
= "capability::create_block_dev", |
| 160 |
[CCS_MAX_MAC_INDEX + CCS_CREATE_CHAR_DEV] |
| 161 |
= "capability::create_char_dev", |
| 162 |
[CCS_MAX_MAC_INDEX + CCS_CREATE_UNIX_SOCKET] |
| 163 |
= "capability::create_unix_socket", |
| 164 |
[CCS_MAX_MAC_INDEX + CCS_SYS_LINK] |
| 165 |
= "capability::SYS_LINK", |
| 166 |
[CCS_MAX_MAC_INDEX + CCS_SYS_SYMLINK] |
| 167 |
= "capability::SYS_SYMLINK", |
| 168 |
[CCS_MAX_MAC_INDEX + CCS_SYS_RENAME] |
| 169 |
= "capability::SYS_RENAME", |
| 170 |
[CCS_MAX_MAC_INDEX + CCS_SYS_UNLINK] |
| 171 |
= "capability::SYS_UNLINK", |
| 172 |
[CCS_MAX_MAC_INDEX + CCS_SYS_CHMOD] |
| 173 |
= "capability::SYS_CHMOD", |
| 174 |
[CCS_MAX_MAC_INDEX + CCS_SYS_CHOWN] |
| 175 |
= "capability::SYS_CHOWN", |
| 176 |
[CCS_MAX_MAC_INDEX + CCS_SYS_IOCTL] |
| 177 |
= "capability::SYS_IOCTL", |
| 178 |
[CCS_MAX_MAC_INDEX + CCS_SYS_KEXEC_LOAD] |
| 179 |
= "capability::SYS_KEXEC_LOAD", |
| 180 |
[CCS_MAX_MAC_INDEX + CCS_SYS_PIVOT_ROOT] |
| 181 |
= "capability::SYS_PIVOT_ROOT", |
| 182 |
[CCS_MAX_MAC_INDEX + CCS_SYS_PTRACE] |
| 183 |
= "capability::SYS_PTRACE", |
| 184 |
[CCS_MAX_MAC_INDEX + CCS_CONCEAL_MOUNT] |
| 185 |
= "capability::conceal_mount", |
| 186 |
[CCS_MAX_MAC_INDEX + CCS_MAX_CAPABILITY_INDEX |
| 187 |
+ CCS_MAC_CATEGORY_FILE] = "file", |
| 188 |
[CCS_MAX_MAC_INDEX + CCS_MAX_CAPABILITY_INDEX |
| 189 |
+ CCS_MAC_CATEGORY_NETWORK] = "network", |
| 190 |
[CCS_MAX_MAC_INDEX + CCS_MAX_CAPABILITY_INDEX |
| 191 |
+ CCS_MAC_CATEGORY_MISC] = "misc", |
| 192 |
[CCS_MAX_MAC_INDEX + CCS_MAX_CAPABILITY_INDEX |
| 193 |
+ CCS_MAC_CATEGORY_IPC] = "ipc", |
| 194 |
[CCS_MAX_MAC_INDEX + CCS_MAX_CAPABILITY_INDEX |
| 195 |
+ CCS_MAC_CATEGORY_CAPABILITY] = "capability", |
| 196 |
}; |
| 197 |
|
| 198 |
/* Permit policy management by non-root user? */ |
| 199 |
static bool ccs_manage_by_non_root; |
| 200 |
|
| 201 |
/** |
| 202 |
* ccs_cap2keyword - Convert capability operation to capability name. |
| 203 |
* |
| 204 |
* @operation: The capability index. |
| 205 |
* |
| 206 |
* Returns the name of the specified capability's name. |
| 207 |
*/ |
| 208 |
const char *ccs_cap2keyword(const u8 operation) |
| 209 |
{ |
| 210 |
return operation < CCS_MAX_CAPABILITY_INDEX |
| 211 |
? ccs_mac_keywords[CCS_MAX_MAC_INDEX + operation] + 12 : NULL; |
| 212 |
} |
| 213 |
|
| 214 |
/** |
| 215 |
* ccs_yesno - Return "yes" or "no". |
| 216 |
* |
| 217 |
* @value: Bool value. |
| 218 |
*/ |
| 219 |
static const char *ccs_yesno(const unsigned int value) |
| 220 |
{ |
| 221 |
return value ? "yes" : "no"; |
| 222 |
} |
| 223 |
|
| 224 |
/** |
| 225 |
* ccs_io_printf - Transactional printf() to "struct ccs_io_buffer" structure. |
| 226 |
* |
| 227 |
* @head: Pointer to "struct ccs_io_buffer". |
| 228 |
* @fmt: The printf()'s format string, followed by parameters. |
| 229 |
* |
| 230 |
* Returns true on success, false otherwise. |
| 231 |
* |
| 232 |
* The snprintf() will truncate, but ccs_io_printf() won't. |
| 233 |
*/ |
| 234 |
bool ccs_io_printf(struct ccs_io_buffer *head, const char *fmt, ...) |
| 235 |
{ |
| 236 |
va_list args; |
| 237 |
int len; |
| 238 |
int pos = head->read_avail; |
| 239 |
int size = head->readbuf_size - pos; |
| 240 |
if (size <= 0) |
| 241 |
return false; |
| 242 |
va_start(args, fmt); |
| 243 |
len = vsnprintf(head->read_buf + pos, size, fmt, args); |
| 244 |
va_end(args); |
| 245 |
if (pos + len >= head->readbuf_size) |
| 246 |
return false; |
| 247 |
head->read_avail += len; |
| 248 |
return true; |
| 249 |
} |
| 250 |
|
| 251 |
/** |
| 252 |
* ccs_assign_profile - Create a new profile. |
| 253 |
* |
| 254 |
* @profile: Profile number to create. |
| 255 |
* |
| 256 |
* Returns pointer to "struct ccs_profile" on success, NULL otherwise. |
| 257 |
*/ |
| 258 |
static struct ccs_profile *ccs_assign_profile(const unsigned int profile) |
| 259 |
{ |
| 260 |
struct ccs_profile *ptr; |
| 261 |
struct ccs_profile *entry; |
| 262 |
if (profile >= CCS_MAX_PROFILES) |
| 263 |
return NULL; |
| 264 |
ptr = ccs_profile_ptr[profile]; |
| 265 |
if (ptr) |
| 266 |
return ptr; |
| 267 |
entry = kzalloc(sizeof(*entry), CCS_GFP_FLAGS); |
| 268 |
if (mutex_lock_interruptible(&ccs_policy_lock)) |
| 269 |
goto out; |
| 270 |
ptr = ccs_profile_ptr[profile]; |
| 271 |
if (!ptr && ccs_memory_ok(entry, sizeof(*entry))) { |
| 272 |
ptr = entry; |
| 273 |
ptr->audit = &ccs_default_profile.preference; |
| 274 |
ptr->learning = &ccs_default_profile.preference; |
| 275 |
ptr->permissive = &ccs_default_profile.preference; |
| 276 |
ptr->enforcing = &ccs_default_profile.preference; |
| 277 |
ptr->default_config = CCS_CONFIG_DISABLED | |
| 278 |
CCS_CONFIG_WANT_GRANT_LOG | CCS_CONFIG_WANT_REJECT_LOG; |
| 279 |
memset(ptr->config, CCS_CONFIG_USE_DEFAULT, |
| 280 |
sizeof(ptr->config)); |
| 281 |
mb(); /* Avoid out-of-order execution. */ |
| 282 |
ccs_profile_ptr[profile] = ptr; |
| 283 |
entry = NULL; |
| 284 |
} |
| 285 |
mutex_unlock(&ccs_policy_lock); |
| 286 |
out: |
| 287 |
kfree(entry); |
| 288 |
return ptr; |
| 289 |
} |
| 290 |
|
| 291 |
/** |
| 292 |
* ccs_check_profile - Check all profiles currently assigned to domains are defined. |
| 293 |
*/ |
| 294 |
static void ccs_check_profile(void) |
| 295 |
{ |
| 296 |
struct ccs_domain_info *domain; |
| 297 |
const int idx = ccs_read_lock(); |
| 298 |
ccs_policy_loaded = true; |
| 299 |
list_for_each_entry_rcu(domain, &ccs_domain_list, list) { |
| 300 |
const u8 profile = domain->profile; |
| 301 |
if (ccs_profile_ptr[profile]) |
| 302 |
continue; |
| 303 |
panic("Profile %u (used by '%s') not defined.\n", |
| 304 |
profile, domain->domainname->name); |
| 305 |
} |
| 306 |
ccs_read_unlock(idx); |
| 307 |
if (ccs_profile_version != 20090903) |
| 308 |
panic("Profile version %u is not supported.\n", |
| 309 |
ccs_profile_version); |
| 310 |
printk(KERN_INFO "CCSecurity: 1.7.2+ 2010/06/04\n"); |
| 311 |
printk(KERN_INFO "Mandatory Access Control activated.\n"); |
| 312 |
} |
| 313 |
|
| 314 |
/** |
| 315 |
* ccs_profile - Find a profile. |
| 316 |
* |
| 317 |
* @profile: Profile number to find. |
| 318 |
* |
| 319 |
* Returns pointer to "struct ccs_profile". |
| 320 |
*/ |
| 321 |
struct ccs_profile *ccs_profile(const u8 profile) |
| 322 |
{ |
| 323 |
struct ccs_profile *ptr = ccs_profile_ptr[profile]; |
| 324 |
if (!ccs_policy_loaded) |
| 325 |
return &ccs_default_profile; |
| 326 |
BUG_ON(!ptr); |
| 327 |
return ptr; |
| 328 |
} |
| 329 |
|
| 330 |
static s8 ccs_find_yesno(const char *string, const char *find) |
| 331 |
{ |
| 332 |
const char *cp = strstr(string, find); |
| 333 |
if (cp) { |
| 334 |
cp += strlen(find); |
| 335 |
if (!strncmp(cp, "=yes", 4)) |
| 336 |
return 1; |
| 337 |
else if (!strncmp(cp, "=no", 3)) |
| 338 |
return 0; |
| 339 |
} |
| 340 |
return -1; |
| 341 |
} |
| 342 |
|
| 343 |
static void ccs_set_bool(bool *b, const char *string, const char *find) |
| 344 |
{ |
| 345 |
switch (ccs_find_yesno(string, find)) { |
| 346 |
case 1: |
| 347 |
*b = true; |
| 348 |
break; |
| 349 |
case 0: |
| 350 |
*b = false; |
| 351 |
break; |
| 352 |
} |
| 353 |
} |
| 354 |
|
| 355 |
static void ccs_set_uint(unsigned int *i, const char *string, const char *find) |
| 356 |
{ |
| 357 |
const char *cp = strstr(string, find); |
| 358 |
if (cp) |
| 359 |
sscanf(cp + strlen(find), "=%u", i); |
| 360 |
} |
| 361 |
|
| 362 |
static void ccs_set_pref(const char *name, const char *value, |
| 363 |
const bool use_default, struct ccs_profile *profile) |
| 364 |
{ |
| 365 |
struct ccs_preference **pref; |
| 366 |
bool *verbose; |
| 367 |
if (!strcmp(name, "audit")) { |
| 368 |
if (use_default) { |
| 369 |
pref = &profile->audit; |
| 370 |
goto set_default; |
| 371 |
} |
| 372 |
profile->audit = &profile->preference; |
| 373 |
#ifdef CONFIG_CCSECURITY_AUDIT |
| 374 |
ccs_set_uint(&profile->preference.audit_max_grant_log, value, |
| 375 |
"max_grant_log"); |
| 376 |
ccs_set_uint(&profile->preference.audit_max_reject_log, value, |
| 377 |
"max_reject_log"); |
| 378 |
#endif |
| 379 |
ccs_set_bool(&profile->preference.audit_task_info, value, |
| 380 |
"task_info"); |
| 381 |
ccs_set_bool(&profile->preference.audit_path_info, value, |
| 382 |
"path_info"); |
| 383 |
return; |
| 384 |
} |
| 385 |
if (!strcmp(name, "enforcing")) { |
| 386 |
if (use_default) { |
| 387 |
pref = &profile->enforcing; |
| 388 |
goto set_default; |
| 389 |
} |
| 390 |
profile->enforcing = &profile->preference; |
| 391 |
ccs_set_uint(&profile->preference.enforcing_penalty, value, |
| 392 |
"penalty"); |
| 393 |
verbose = &profile->preference.enforcing_verbose; |
| 394 |
goto set_verbose; |
| 395 |
} |
| 396 |
if (!strcmp(name, "permissive")) { |
| 397 |
if (use_default) { |
| 398 |
pref = &profile->permissive; |
| 399 |
goto set_default; |
| 400 |
} |
| 401 |
profile->permissive = &profile->preference; |
| 402 |
verbose = &profile->preference.permissive_verbose; |
| 403 |
goto set_verbose; |
| 404 |
} |
| 405 |
if (!strcmp(name, "learning")) { |
| 406 |
if (use_default) { |
| 407 |
pref = &profile->learning; |
| 408 |
goto set_default; |
| 409 |
} |
| 410 |
profile->learning = &profile->preference; |
| 411 |
ccs_set_uint(&profile->preference.learning_max_entry, value, |
| 412 |
"max_entry"); |
| 413 |
ccs_set_bool(&profile->preference.learning_exec_realpath, |
| 414 |
value, "exec.realpath"); |
| 415 |
ccs_set_bool(&profile->preference.learning_exec_argv0, value, |
| 416 |
"exec.argv0"); |
| 417 |
ccs_set_bool(&profile->preference.learning_symlink_target, |
| 418 |
value, "symlink.target"); |
| 419 |
verbose = &profile->preference.learning_verbose; |
| 420 |
goto set_verbose; |
| 421 |
} |
| 422 |
return; |
| 423 |
set_default: |
| 424 |
*pref = &ccs_default_profile.preference; |
| 425 |
return; |
| 426 |
set_verbose: |
| 427 |
ccs_set_bool(verbose, value, "verbose"); |
| 428 |
} |
| 429 |
|
| 430 |
static int ccs_set_mode(char *name, const char *value, const bool use_default, |
| 431 |
struct ccs_profile *profile) |
| 432 |
{ |
| 433 |
u8 i; |
| 434 |
u8 config; |
| 435 |
if (!strcmp(name, "CONFIG")) { |
| 436 |
i = CCS_MAX_MAC_INDEX + CCS_MAX_CAPABILITY_INDEX |
| 437 |
+ CCS_MAX_MAC_CATEGORY_INDEX; |
| 438 |
config = profile->default_config; |
| 439 |
} else if (ccs_str_starts(&name, "CONFIG::")) { |
| 440 |
config = 0; |
| 441 |
for (i = 0; i < CCS_MAX_MAC_INDEX + CCS_MAX_CAPABILITY_INDEX |
| 442 |
+ CCS_MAX_MAC_CATEGORY_INDEX; i++) { |
| 443 |
if (strcmp(name, ccs_mac_keywords[i])) |
| 444 |
continue; |
| 445 |
config = profile->config[i]; |
| 446 |
break; |
| 447 |
} |
| 448 |
if (i == CCS_MAX_MAC_INDEX + CCS_MAX_CAPABILITY_INDEX |
| 449 |
+ CCS_MAX_MAC_CATEGORY_INDEX) |
| 450 |
return -EINVAL; |
| 451 |
} else { |
| 452 |
return -EINVAL; |
| 453 |
} |
| 454 |
if (use_default) { |
| 455 |
config = CCS_CONFIG_USE_DEFAULT; |
| 456 |
} else { |
| 457 |
u8 mode; |
| 458 |
for (mode = 0; mode < CCS_CONFIG_MAX_MODE; mode++) |
| 459 |
if (strstr(value, ccs_mode[mode])) |
| 460 |
/* |
| 461 |
* Update lower 3 bits in order to distinguish |
| 462 |
* 'config' from 'CCS_CONFIG_USE_DEAFULT'. |
| 463 |
*/ |
| 464 |
config = (config & ~7) | mode; |
| 465 |
#ifdef CONFIG_CCSECURITY_AUDIT |
| 466 |
if (config != CCS_CONFIG_USE_DEFAULT) { |
| 467 |
switch (ccs_find_yesno(value, "grant_log")) { |
| 468 |
case 1: |
| 469 |
config |= CCS_CONFIG_WANT_GRANT_LOG; |
| 470 |
break; |
| 471 |
case 0: |
| 472 |
config &= ~CCS_CONFIG_WANT_GRANT_LOG; |
| 473 |
break; |
| 474 |
} |
| 475 |
switch (ccs_find_yesno(value, "reject_log")) { |
| 476 |
case 1: |
| 477 |
config |= CCS_CONFIG_WANT_REJECT_LOG; |
| 478 |
break; |
| 479 |
case 0: |
| 480 |
config &= ~CCS_CONFIG_WANT_REJECT_LOG; |
| 481 |
break; |
| 482 |
} |
| 483 |
} |
| 484 |
#endif |
| 485 |
} |
| 486 |
if (i < CCS_MAX_MAC_INDEX + CCS_MAX_CAPABILITY_INDEX |
| 487 |
+ CCS_MAX_MAC_CATEGORY_INDEX) |
| 488 |
profile->config[i] = config; |
| 489 |
else if (config != CCS_CONFIG_USE_DEFAULT) |
| 490 |
profile->default_config = config; |
| 491 |
return 0; |
| 492 |
} |
| 493 |
|
| 494 |
/** |
| 495 |
* ccs_write_profile - Write profile table. |
| 496 |
* |
| 497 |
* @head: Pointer to "struct ccs_io_buffer". |
| 498 |
* |
| 499 |
* Returns 0 on success, negative value otherwise. |
| 500 |
*/ |
| 501 |
static int ccs_write_profile(struct ccs_io_buffer *head) |
| 502 |
{ |
| 503 |
char *data = head->write_buf; |
| 504 |
bool use_default = false; |
| 505 |
char *cp; |
| 506 |
int i; |
| 507 |
struct ccs_profile *profile; |
| 508 |
if (sscanf(data, "PROFILE_VERSION=%u", &ccs_profile_version) == 1) |
| 509 |
return 0; |
| 510 |
i = simple_strtoul(data, &cp, 10); |
| 511 |
if (data == cp) { |
| 512 |
profile = &ccs_default_profile; |
| 513 |
} else { |
| 514 |
if (*cp != '-') |
| 515 |
return -EINVAL; |
| 516 |
data = cp + 1; |
| 517 |
profile = ccs_assign_profile(i); |
| 518 |
if (!profile) |
| 519 |
return -EINVAL; |
| 520 |
} |
| 521 |
cp = strchr(data, '='); |
| 522 |
if (!cp) |
| 523 |
return -EINVAL; |
| 524 |
*cp++ = '\0'; |
| 525 |
if (profile != &ccs_default_profile) |
| 526 |
use_default = strstr(cp, "use_default") != NULL; |
| 527 |
if (ccs_str_starts(&data, "PREFERENCE::")) { |
| 528 |
ccs_set_pref(data, cp, use_default, profile); |
| 529 |
return 0; |
| 530 |
} |
| 531 |
if (profile == &ccs_default_profile) |
| 532 |
return -EINVAL; |
| 533 |
if (!strcmp(data, "COMMENT")) { |
| 534 |
const struct ccs_path_info *old_comment = profile->comment; |
| 535 |
profile->comment = ccs_get_name(cp); |
| 536 |
ccs_put_name(old_comment); |
| 537 |
return 0; |
| 538 |
} |
| 539 |
return ccs_set_mode(data, cp, use_default, profile); |
| 540 |
} |
| 541 |
|
| 542 |
static bool ccs_print_preference(struct ccs_io_buffer *head, const int idx) |
| 543 |
{ |
| 544 |
struct ccs_preference *pref = &ccs_default_profile.preference; |
| 545 |
const struct ccs_profile *profile = idx >= 0 ? |
| 546 |
ccs_profile_ptr[idx] : NULL; |
| 547 |
char buffer[16] = ""; |
| 548 |
if (profile) { |
| 549 |
buffer[sizeof(buffer) - 1] = '\0'; |
| 550 |
snprintf(buffer, sizeof(buffer) - 1, "%u-", idx); |
| 551 |
} |
| 552 |
if (profile) { |
| 553 |
pref = profile->audit; |
| 554 |
if (pref == &ccs_default_profile.preference) |
| 555 |
pref = NULL; |
| 556 |
} |
| 557 |
if (pref && !ccs_io_printf(head, "%sPREFERENCE::%s={ " |
| 558 |
#ifdef CONFIG_CCSECURITY_AUDIT |
| 559 |
"max_grant_log=%u max_reject_log=%u " |
| 560 |
#endif |
| 561 |
"task_info=%s path_info=%s }\n", buffer, |
| 562 |
"audit", |
| 563 |
#ifdef CONFIG_CCSECURITY_AUDIT |
| 564 |
pref->audit_max_grant_log, |
| 565 |
pref->audit_max_reject_log, |
| 566 |
#endif |
| 567 |
ccs_yesno(pref->audit_task_info), |
| 568 |
ccs_yesno(pref->audit_path_info))) |
| 569 |
return false; |
| 570 |
if (profile) { |
| 571 |
pref = profile->learning; |
| 572 |
if (pref == &ccs_default_profile.preference) |
| 573 |
pref = NULL; |
| 574 |
} |
| 575 |
if (pref && !ccs_io_printf(head, "%sPREFERENCE::%s={ " |
| 576 |
"verbose=%s max_entry=%u exec.realpath=%s " |
| 577 |
"exec.argv0=%s symlink.target=%s }\n", |
| 578 |
buffer, "learning", |
| 579 |
ccs_yesno(pref->learning_verbose), |
| 580 |
pref->learning_max_entry, |
| 581 |
ccs_yesno(pref->learning_exec_realpath), |
| 582 |
ccs_yesno(pref->learning_exec_argv0), |
| 583 |
ccs_yesno(pref->learning_symlink_target))) |
| 584 |
return false; |
| 585 |
if (profile) { |
| 586 |
pref = profile->permissive; |
| 587 |
if (pref == &ccs_default_profile.preference) |
| 588 |
pref = NULL; |
| 589 |
} |
| 590 |
if (pref && !ccs_io_printf(head, "%sPREFERENCE::%s={ verbose=%s }\n", |
| 591 |
buffer, "permissive", |
| 592 |
ccs_yesno(pref->permissive_verbose))) |
| 593 |
return false; |
| 594 |
if (profile) { |
| 595 |
pref = profile->enforcing; |
| 596 |
if (pref == &ccs_default_profile.preference) |
| 597 |
pref = NULL; |
| 598 |
} |
| 599 |
return !pref || ccs_io_printf(head, "%sPREFERENCE::%s={ verbose=%s " |
| 600 |
"penalty=%u }\n", buffer, "enforcing", |
| 601 |
ccs_yesno(pref->enforcing_verbose), |
| 602 |
pref->enforcing_penalty); |
| 603 |
} |
| 604 |
|
| 605 |
/** |
| 606 |
* ccs_read_profile - Read profile table. |
| 607 |
* |
| 608 |
* @head: Pointer to "struct ccs_io_buffer". |
| 609 |
*/ |
| 610 |
static void ccs_read_profile(struct ccs_io_buffer *head) |
| 611 |
{ |
| 612 |
int index; |
| 613 |
if (head->read_eof) |
| 614 |
return; |
| 615 |
if (head->read_bit) |
| 616 |
goto body; |
| 617 |
ccs_io_printf(head, "PROFILE_VERSION=%s\n", "20090903"); |
| 618 |
ccs_print_preference(head, -1); |
| 619 |
head->read_bit = 1; |
| 620 |
body: |
| 621 |
for (index = head->read_step; index < CCS_MAX_PROFILES; index++) { |
| 622 |
bool done; |
| 623 |
u8 config; |
| 624 |
int i; |
| 625 |
int pos; |
| 626 |
const struct ccs_profile *profile = ccs_profile_ptr[index]; |
| 627 |
const struct ccs_path_info *comment; |
| 628 |
head->read_step = index; |
| 629 |
if (!profile) |
| 630 |
continue; |
| 631 |
pos = head->read_avail; |
| 632 |
comment = profile->comment; |
| 633 |
done = ccs_io_printf(head, "%u-COMMENT=%s\n", index, |
| 634 |
comment ? comment->name : ""); |
| 635 |
if (!done) |
| 636 |
goto out; |
| 637 |
config = profile->default_config; |
| 638 |
#ifdef CONFIG_CCSECURITY_AUDIT |
| 639 |
if (!ccs_io_printf(head, "%u-%s%s={ mode=%s " |
| 640 |
"grant_log=%s reject_log=%s }\n", index, |
| 641 |
"CONFIG", "", ccs_mode[config & 3], |
| 642 |
ccs_yesno(config & |
| 643 |
CCS_CONFIG_WANT_GRANT_LOG), |
| 644 |
ccs_yesno(config & |
| 645 |
CCS_CONFIG_WANT_REJECT_LOG))) |
| 646 |
goto out; |
| 647 |
#else |
| 648 |
if (!ccs_io_printf(head, "%u-%s%s={ mode=%s }\n", index, |
| 649 |
"CONFIG", "", ccs_mode[config & 3])) |
| 650 |
goto out; |
| 651 |
#endif |
| 652 |
for (i = 0; i < CCS_MAX_MAC_INDEX + CCS_MAX_CAPABILITY_INDEX |
| 653 |
+ CCS_MAX_MAC_CATEGORY_INDEX; i++) { |
| 654 |
#ifdef CONFIG_CCSECURITY_AUDIT |
| 655 |
const char *g; |
| 656 |
const char *r; |
| 657 |
#endif |
| 658 |
config = profile->config[i]; |
| 659 |
if (config == CCS_CONFIG_USE_DEFAULT) |
| 660 |
continue; |
| 661 |
#ifdef CONFIG_CCSECURITY_AUDIT |
| 662 |
g = ccs_yesno(config & CCS_CONFIG_WANT_GRANT_LOG); |
| 663 |
r = ccs_yesno(config & CCS_CONFIG_WANT_REJECT_LOG); |
| 664 |
if (!ccs_io_printf(head, "%u-%s%s={ mode=%s " |
| 665 |
"grant_log=%s reject_log=%s }\n", |
| 666 |
index, "CONFIG::", |
| 667 |
ccs_mac_keywords[i], |
| 668 |
ccs_mode[config & 3], g, r)) |
| 669 |
goto out; |
| 670 |
#else |
| 671 |
if (!ccs_io_printf(head, "%u-%s%s={ mode=%s }\n", |
| 672 |
index, "CONFIG::", |
| 673 |
ccs_mac_keywords[i], |
| 674 |
ccs_mode[config & 3])) |
| 675 |
goto out; |
| 676 |
#endif |
| 677 |
} |
| 678 |
if (!ccs_print_preference(head, index)) |
| 679 |
goto out; |
| 680 |
continue; |
| 681 |
out: |
| 682 |
head->read_avail = pos; |
| 683 |
break; |
| 684 |
} |
| 685 |
if (index == CCS_MAX_PROFILES) |
| 686 |
head->read_eof = true; |
| 687 |
} |
| 688 |
|
| 689 |
static bool ccs_same_manager_entry(const struct ccs_acl_head *a, |
| 690 |
const struct ccs_acl_head *b) |
| 691 |
{ |
| 692 |
return container_of(a, struct ccs_manager, head)->manager |
| 693 |
== container_of(b, struct ccs_manager, head)->manager; |
| 694 |
} |
| 695 |
|
| 696 |
/** |
| 697 |
* ccs_update_manager_entry - Add a manager entry. |
| 698 |
* |
| 699 |
* @manager: The path to manager or the domainnamme. |
| 700 |
* @is_delete: True if it is a delete request. |
| 701 |
* |
| 702 |
* Returns 0 on success, negative value otherwise. |
| 703 |
*/ |
| 704 |
static int ccs_update_manager_entry(const char *manager, const bool is_delete) |
| 705 |
{ |
| 706 |
struct ccs_manager e = { }; |
| 707 |
int error = is_delete ? -ENOENT : -ENOMEM; |
| 708 |
if (ccs_domain_def(manager)) { |
| 709 |
if (!ccs_correct_domain(manager)) |
| 710 |
return -EINVAL; |
| 711 |
e.is_domain = true; |
| 712 |
} else { |
| 713 |
if (!ccs_correct_path(manager)) |
| 714 |
return -EINVAL; |
| 715 |
} |
| 716 |
e.manager = ccs_get_name(manager); |
| 717 |
if (!e.manager) |
| 718 |
return error; |
| 719 |
error = ccs_update_policy(&e.head, sizeof(e), is_delete, |
| 720 |
&ccs_policy_list[CCS_ID_MANAGER], |
| 721 |
ccs_same_manager_entry); |
| 722 |
ccs_put_name(e.manager); |
| 723 |
return error; |
| 724 |
} |
| 725 |
|
| 726 |
/** |
| 727 |
* ccs_write_manager - Write manager policy. |
| 728 |
* |
| 729 |
* @head: Pointer to "struct ccs_io_buffer". |
| 730 |
* |
| 731 |
* Returns 0 on success, negative value otherwise. |
| 732 |
*/ |
| 733 |
static int ccs_write_manager(struct ccs_io_buffer *head) |
| 734 |
{ |
| 735 |
char *data = head->write_buf; |
| 736 |
bool is_delete = ccs_str_starts(&data, CCS_KEYWORD_DELETE); |
| 737 |
if (!strcmp(data, "manage_by_non_root")) { |
| 738 |
ccs_manage_by_non_root = !is_delete; |
| 739 |
return 0; |
| 740 |
} |
| 741 |
return ccs_update_manager_entry(data, is_delete); |
| 742 |
} |
| 743 |
|
| 744 |
/** |
| 745 |
* ccs_read_manager - Read manager policy. |
| 746 |
* |
| 747 |
* @head: Pointer to "struct ccs_io_buffer". |
| 748 |
* |
| 749 |
* Caller holds ccs_read_lock(). |
| 750 |
*/ |
| 751 |
static void ccs_read_manager(struct ccs_io_buffer *head) |
| 752 |
{ |
| 753 |
struct list_head *pos; |
| 754 |
if (head->read_eof) |
| 755 |
return; |
| 756 |
list_for_each_cookie(pos, head->read_var2, |
| 757 |
&ccs_policy_list[CCS_ID_MANAGER]) { |
| 758 |
struct ccs_manager *ptr |
| 759 |
= list_entry(pos, typeof(*ptr), head.list); |
| 760 |
if (ptr->head.is_deleted) |
| 761 |
continue; |
| 762 |
if (!ccs_io_printf(head, "%s\n", ptr->manager->name)) |
| 763 |
return; |
| 764 |
} |
| 765 |
head->read_eof = true; |
| 766 |
} |
| 767 |
|
| 768 |
/** |
| 769 |
* ccs_manager - Check whether the current process is a policy manager. |
| 770 |
* |
| 771 |
* Returns true if the current process is permitted to modify policy |
| 772 |
* via /proc/ccs/ interface. |
| 773 |
* |
| 774 |
* Caller holds ccs_read_lock(). |
| 775 |
*/ |
| 776 |
static bool ccs_manager(void) |
| 777 |
{ |
| 778 |
struct ccs_manager *ptr; |
| 779 |
const char *exe; |
| 780 |
struct task_struct *task = current; |
| 781 |
const struct ccs_path_info *domainname |
| 782 |
= ccs_current_domain()->domainname; |
| 783 |
bool found = false; |
| 784 |
if (!ccs_policy_loaded) |
| 785 |
return true; |
| 786 |
if (task->ccs_flags & CCS_TASK_IS_MANAGER) |
| 787 |
return true; |
| 788 |
if (!ccs_manage_by_non_root && (current_uid() || current_euid())) |
| 789 |
return false; |
| 790 |
exe = ccs_get_exe(); |
| 791 |
list_for_each_entry_rcu(ptr, &ccs_policy_list[CCS_ID_MANAGER], |
| 792 |
head.list) { |
| 793 |
if (ptr->head.is_deleted) |
| 794 |
continue; |
| 795 |
if (ptr->is_domain) { |
| 796 |
if (ccs_pathcmp(domainname, ptr->manager)) |
| 797 |
continue; |
| 798 |
} else { |
| 799 |
if (!exe || strcmp(exe, ptr->manager->name)) |
| 800 |
continue; |
| 801 |
} |
| 802 |
/* Set manager flag. */ |
| 803 |
task->ccs_flags |= CCS_TASK_IS_MANAGER; |
| 804 |
found = true; |
| 805 |
break; |
| 806 |
} |
| 807 |
if (!found) { /* Reduce error messages. */ |
| 808 |
static pid_t ccs_last_pid; |
| 809 |
const pid_t pid = current->pid; |
| 810 |
if (ccs_last_pid != pid) { |
| 811 |
printk(KERN_WARNING "%s ( %s ) is not permitted to " |
| 812 |
"update policies.\n", domainname->name, exe); |
| 813 |
ccs_last_pid = pid; |
| 814 |
} |
| 815 |
} |
| 816 |
kfree(exe); |
| 817 |
return found; |
| 818 |
} |
| 819 |
|
| 820 |
/** |
| 821 |
* ccs_find_condition_part - Find condition part from the statement. |
| 822 |
* |
| 823 |
* @data: String to parse. |
| 824 |
* |
| 825 |
* Returns pointer to the condition part if it was found in the statement, |
| 826 |
* NULL otherwise. |
| 827 |
*/ |
| 828 |
static char *ccs_find_condition_part(char *data) |
| 829 |
{ |
| 830 |
char *cp = strstr(data, " if "); |
| 831 |
if (!cp) |
| 832 |
cp = strstr(data, " ; set "); |
| 833 |
if (cp) |
| 834 |
*cp++ = '\0'; |
| 835 |
return cp; |
| 836 |
} |
| 837 |
|
| 838 |
/** |
| 839 |
* ccs_select_one - Parse select command. |
| 840 |
* |
| 841 |
* @head: Pointer to "struct ccs_io_buffer". |
| 842 |
* @data: String to parse. |
| 843 |
* |
| 844 |
* Returns true on success, false otherwise. |
| 845 |
* |
| 846 |
* Caller holds ccs_read_lock(). |
| 847 |
*/ |
| 848 |
static bool ccs_select_one(struct ccs_io_buffer *head, const char *data) |
| 849 |
{ |
| 850 |
unsigned int pid; |
| 851 |
struct ccs_domain_info *domain = NULL; |
| 852 |
bool global_pid = false; |
| 853 |
if (!strcmp(data, "allow_execute")) { |
| 854 |
head->read_execute_only = true; |
| 855 |
return true; |
| 856 |
} |
| 857 |
if (sscanf(data, "pid=%u", &pid) == 1 || |
| 858 |
(global_pid = true, sscanf(data, "global-pid=%u", &pid) == 1)) { |
| 859 |
struct task_struct *p; |
| 860 |
ccs_tasklist_lock(); |
| 861 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 24) |
| 862 |
if (global_pid) |
| 863 |
p = ccsecurity_exports.find_task_by_pid_ns(pid, |
| 864 |
&init_pid_ns); |
| 865 |
else |
| 866 |
p = ccsecurity_exports.find_task_by_vpid(pid); |
| 867 |
#else |
| 868 |
p = find_task_by_pid(pid); |
| 869 |
#endif |
| 870 |
if (p) |
| 871 |
domain = ccs_task_domain(p); |
| 872 |
ccs_tasklist_unlock(); |
| 873 |
} else if (!strncmp(data, "domain=", 7)) { |
| 874 |
if (ccs_domain_def(data + 7)) |
| 875 |
domain = ccs_find_domain(data + 7); |
| 876 |
} else |
| 877 |
return false; |
| 878 |
head->write_var1 = domain; |
| 879 |
/* Accessing read_buf is safe because head->io_sem is held. */ |
| 880 |
if (!head->read_buf) |
| 881 |
return true; /* Do nothing if open(O_WRONLY). */ |
| 882 |
head->read_avail = 0; |
| 883 |
head->read_cond = false; |
| 884 |
ccs_io_printf(head, "# select %s\n", data); |
| 885 |
head->read_single_domain = true; |
| 886 |
head->read_eof = !domain; |
| 887 |
head->read_var1 = &domain->list; |
| 888 |
head->read_var2 = NULL; |
| 889 |
head->read_bit = 0; |
| 890 |
head->read_step = 0; |
| 891 |
if (domain && domain->is_deleted) |
| 892 |
ccs_io_printf(head, "# This is a deleted domain.\n"); |
| 893 |
return true; |
| 894 |
} |
| 895 |
|
| 896 |
static int ccs_write_domain2(char *data, struct ccs_domain_info *domain, |
| 897 |
const bool is_delete) |
| 898 |
{ |
| 899 |
static const struct { |
| 900 |
const char *keyword; |
| 901 |
int (*write) (char *, struct ccs_domain_info *, |
| 902 |
struct ccs_condition *, const bool); |
| 903 |
} ccs_callback[5] = { |
| 904 |
{ CCS_KEYWORD_ALLOW_NETWORK, ccs_write_network }, |
| 905 |
{ CCS_KEYWORD_ALLOW_ENV, ccs_write_env }, |
| 906 |
{ CCS_KEYWORD_ALLOW_CAPABILITY, ccs_write_capability }, |
| 907 |
{ CCS_KEYWORD_ALLOW_SIGNAL, ccs_write_signal }, |
| 908 |
{ CCS_KEYWORD_ALLOW_MOUNT, ccs_write_mount } |
| 909 |
}; |
| 910 |
int (*write) (char *, struct ccs_domain_info *, struct ccs_condition *, |
| 911 |
const bool) = ccs_write_file; |
| 912 |
int error; |
| 913 |
u8 i; |
| 914 |
struct ccs_condition *cond = NULL; |
| 915 |
char *cp = ccs_find_condition_part(data); |
| 916 |
if (cp) { |
| 917 |
cond = ccs_get_condition(cp); |
| 918 |
if (!cond) |
| 919 |
return -EINVAL; |
| 920 |
} |
| 921 |
for (i = 0; i < 5; i++) { |
| 922 |
if (!ccs_str_starts(&data, ccs_callback[i].keyword)) |
| 923 |
continue; |
| 924 |
write = ccs_callback[i].write; |
| 925 |
break; |
| 926 |
} |
| 927 |
error = write(data, domain, cond, is_delete); |
| 928 |
if (cond) |
| 929 |
ccs_put_condition(cond); |
| 930 |
return error; |
| 931 |
} |
| 932 |
|
| 933 |
static const char *ccs_dif[CCS_MAX_DOMAIN_INFO_FLAGS] = { |
| 934 |
[CCS_DIF_QUOTA_WARNED] = CCS_KEYWORD_QUOTA_EXCEEDED "\n", |
| 935 |
[CCS_DIF_IGNORE_GLOBAL] = CCS_KEYWORD_IGNORE_GLOBAL "\n", |
| 936 |
[CCS_DIF_IGNORE_GLOBAL_ALLOW_READ] |
| 937 |
= CCS_KEYWORD_IGNORE_GLOBAL_ALLOW_READ "\n", |
| 938 |
[CCS_DIF_IGNORE_GLOBAL_ALLOW_ENV] |
| 939 |
= CCS_KEYWORD_IGNORE_GLOBAL_ALLOW_ENV "\n", |
| 940 |
[CCS_DIF_TRANSITION_FAILED] = CCS_KEYWORD_TRANSITION_FAILED "\n" |
| 941 |
}; |
| 942 |
|
| 943 |
/** |
| 944 |
* ccs_write_domain - Write domain policy. |
| 945 |
* |
| 946 |
* @head: Pointer to "struct ccs_io_buffer". |
| 947 |
* |
| 948 |
* Returns 0 on success, negative value otherwise. |
| 949 |
*/ |
| 950 |
static int ccs_write_domain(struct ccs_io_buffer *head) |
| 951 |
{ |
| 952 |
char *data = head->write_buf; |
| 953 |
struct ccs_domain_info *domain = head->write_var1; |
| 954 |
bool is_delete = false; |
| 955 |
bool is_select = false; |
| 956 |
unsigned int profile; |
| 957 |
if (ccs_str_starts(&data, CCS_KEYWORD_DELETE)) |
| 958 |
is_delete = true; |
| 959 |
else if (ccs_str_starts(&data, CCS_KEYWORD_SELECT)) |
| 960 |
is_select = true; |
| 961 |
if (is_select && ccs_select_one(head, data)) |
| 962 |
return 0; |
| 963 |
/* Don't allow updating policies by non manager programs. */ |
| 964 |
if (!ccs_manager()) |
| 965 |
return -EPERM; |
| 966 |
if (ccs_domain_def(data)) { |
| 967 |
domain = NULL; |
| 968 |
if (is_delete) |
| 969 |
ccs_delete_domain(data); |
| 970 |
else if (is_select) |
| 971 |
domain = ccs_find_domain(data); |
| 972 |
else |
| 973 |
domain = ccs_assign_domain(data, 0); |
| 974 |
head->write_var1 = domain; |
| 975 |
return 0; |
| 976 |
} |
| 977 |
if (!domain) |
| 978 |
return -EINVAL; |
| 979 |
|
| 980 |
if (sscanf(data, CCS_KEYWORD_USE_PROFILE "%u", &profile) == 1 |
| 981 |
&& profile < CCS_MAX_PROFILES) { |
| 982 |
if (!ccs_policy_loaded || ccs_profile_ptr[(u8) profile]) |
| 983 |
domain->profile = (u8) profile; |
| 984 |
return 0; |
| 985 |
} |
| 986 |
for (profile = 0; profile < CCS_MAX_DOMAIN_INFO_FLAGS; profile++) { |
| 987 |
const char *cp = ccs_dif[profile]; |
| 988 |
if (strncmp(data, cp, strlen(cp) - 1)) |
| 989 |
continue; |
| 990 |
domain->flags[profile] = !is_delete; |
| 991 |
return 0; |
| 992 |
} |
| 993 |
return ccs_write_domain2(data, domain, is_delete); |
| 994 |
} |
| 995 |
|
| 996 |
/** |
| 997 |
* ccs_print_name_union - Print a ccs_name_union. |
| 998 |
* |
| 999 |
* @head: Pointer to "struct ccs_io_buffer". |
| 1000 |
* @ptr: Pointer to "struct ccs_name_union". |
| 1001 |
* |
| 1002 |
* Returns true on success, false otherwise. |
| 1003 |
*/ |
| 1004 |
static bool ccs_print_name_union(struct ccs_io_buffer *head, |
| 1005 |
const struct ccs_name_union *ptr) |
| 1006 |
{ |
| 1007 |
int pos = head->read_avail; |
| 1008 |
if (pos && head->read_buf[pos - 1] == ' ') |
| 1009 |
head->read_avail--; |
| 1010 |
if (ptr->is_group) |
| 1011 |
return ccs_io_printf(head, " @%s", |
| 1012 |
ptr->group->group_name->name); |
| 1013 |
return ccs_io_printf(head, " %s", ptr->filename->name); |
| 1014 |
} |
| 1015 |
|
| 1016 |
/** |
| 1017 |
* ccs_print_name_union_quoted - Print a ccs_name_union with double quotes. |
| 1018 |
* |
| 1019 |
* @head: Pointer to "struct ccs_io_buffer". |
| 1020 |
* @ptr: Pointer to "struct ccs_name_union". |
| 1021 |
* |
| 1022 |
* Returns true on success, false otherwise. |
| 1023 |
*/ |
| 1024 |
static bool ccs_print_name_union_quoted(struct ccs_io_buffer *head, |
| 1025 |
const struct ccs_name_union *ptr) |
| 1026 |
{ |
| 1027 |
if (ptr->is_group) |
| 1028 |
return ccs_io_printf(head, "@%s", |
| 1029 |
ptr->group->group_name->name); |
| 1030 |
return ccs_io_printf(head, "\"%s\"", ptr->filename->name); |
| 1031 |
} |
| 1032 |
|
| 1033 |
static void ccs_print_number(char *buffer, int buffer_len, |
| 1034 |
const struct ccs_number_union *ptr) |
| 1035 |
{ |
| 1036 |
int i; |
| 1037 |
unsigned long min = ptr->values[0]; |
| 1038 |
const unsigned long max = ptr->values[1]; |
| 1039 |
u8 min_type = ptr->value_type[0]; |
| 1040 |
const u8 max_type = ptr->value_type[1]; |
| 1041 |
memset(buffer, 0, buffer_len); |
| 1042 |
buffer_len -= 2; |
| 1043 |
for (i = 0; i < 2; i++) { |
| 1044 |
int len; |
| 1045 |
switch (min_type) { |
| 1046 |
case CCS_VALUE_TYPE_HEXADECIMAL: |
| 1047 |
snprintf(buffer, buffer_len, "0x%lX", min); |
| 1048 |
break; |
| 1049 |
case CCS_VALUE_TYPE_OCTAL: |
| 1050 |
snprintf(buffer, buffer_len, "0%lo", min); |
| 1051 |
break; |
| 1052 |
default: |
| 1053 |
snprintf(buffer, buffer_len, "%lu", min); |
| 1054 |
break; |
| 1055 |
} |
| 1056 |
if (min == max && min_type == max_type) |
| 1057 |
break; |
| 1058 |
len = strlen(buffer); |
| 1059 |
buffer[len++] = '-'; |
| 1060 |
buffer += len; |
| 1061 |
buffer_len -= len; |
| 1062 |
min_type = max_type; |
| 1063 |
min = max; |
| 1064 |
} |
| 1065 |
} |
| 1066 |
|
| 1067 |
/** |
| 1068 |
* ccs_print_number_union_common - Print a ccs_number_union. |
| 1069 |
* |
| 1070 |
* @head: Pointer to "struct ccs_io_buffer". |
| 1071 |
* @ptr: Pointer to "struct ccs_number_union". |
| 1072 |
* @need_space: True if a space character is needed. |
| 1073 |
* |
| 1074 |
* Returns true on success, false otherwise. |
| 1075 |
*/ |
| 1076 |
static bool ccs_print_number_union_common(struct ccs_io_buffer *head, |
| 1077 |
const struct ccs_number_union *ptr, |
| 1078 |
const bool need_space) |
| 1079 |
{ |
| 1080 |
char buffer[128]; |
| 1081 |
if (need_space && !ccs_io_printf(head, " ")) |
| 1082 |
return false; |
| 1083 |
if (ptr->is_group) |
| 1084 |
return ccs_io_printf(head, "@%s", |
| 1085 |
ptr->group->group_name->name); |
| 1086 |
ccs_print_number(buffer, sizeof(buffer), ptr); |
| 1087 |
return ccs_io_printf(head, "%s", buffer); |
| 1088 |
} |
| 1089 |
|
| 1090 |
/** |
| 1091 |
* ccs_print_number_union - Print a ccs_number_union. |
| 1092 |
* |
| 1093 |
* @head: Pointer to "struct ccs_io_buffer". |
| 1094 |
* @ptr: Pointer to "struct ccs_number_union". |
| 1095 |
* |
| 1096 |
* Returns true on success, false otherwise. |
| 1097 |
*/ |
| 1098 |
static bool ccs_print_number_union(struct ccs_io_buffer *head, |
| 1099 |
const struct ccs_number_union *ptr) |
| 1100 |
{ |
| 1101 |
return ccs_print_number_union_common(head, ptr, true); |
| 1102 |
} |
| 1103 |
|
| 1104 |
/** |
| 1105 |
* ccs_print_number_union_nospace - Print a ccs_number_union without a space character. |
| 1106 |
* |
| 1107 |
* @head: Pointer to "struct ccs_io_buffer". |
| 1108 |
* @ptr: Pointer to "struct ccs_number_union". |
| 1109 |
* |
| 1110 |
* Returns true on success, false otherwise. |
| 1111 |
*/ |
| 1112 |
static bool ccs_print_number_union_nospace(struct ccs_io_buffer *head, |
| 1113 |
const struct ccs_number_union *ptr) |
| 1114 |
{ |
| 1115 |
return ccs_print_number_union_common(head, ptr, false); |
| 1116 |
} |
| 1117 |
|
| 1118 |
/** |
| 1119 |
* ccs_print_condition - Print condition part. |
| 1120 |
* |
| 1121 |
* @head: Pointer to "struct ccs_io_buffer". |
| 1122 |
* @cond: Pointer to "struct ccs_condition". Maybe NULL. |
| 1123 |
* |
| 1124 |
* Returns true on success, false otherwise. |
| 1125 |
*/ |
| 1126 |
static bool ccs_print_condition(struct ccs_io_buffer *head, |
| 1127 |
const struct ccs_condition *cond) |
| 1128 |
{ |
| 1129 |
const struct ccs_condition_element *condp; |
| 1130 |
const struct ccs_number_union *numbers_p; |
| 1131 |
const struct ccs_name_union *names_p; |
| 1132 |
const struct ccs_argv *argv; |
| 1133 |
const struct ccs_envp *envp; |
| 1134 |
u16 condc; |
| 1135 |
u16 i; |
| 1136 |
u16 j; |
| 1137 |
char buffer[32]; |
| 1138 |
if (!cond) |
| 1139 |
goto no_condition; |
| 1140 |
condc = cond->condc; |
| 1141 |
condp = (const struct ccs_condition_element *) (cond + 1); |
| 1142 |
numbers_p = (const struct ccs_number_union *) (condp + condc); |
| 1143 |
names_p = (const struct ccs_name_union *) |
| 1144 |
(numbers_p + cond->numbers_count); |
| 1145 |
argv = (const struct ccs_argv *) (names_p + cond->names_count); |
| 1146 |
envp = (const struct ccs_envp *) (argv + cond->argc); |
| 1147 |
memset(buffer, 0, sizeof(buffer)); |
| 1148 |
if (condc && !ccs_io_printf(head, "%s", " if")) |
| 1149 |
goto out; |
| 1150 |
for (i = 0; i < condc; i++) { |
| 1151 |
const u8 match = condp->equals; |
| 1152 |
const u8 left = condp->left; |
| 1153 |
const u8 right = condp->right; |
| 1154 |
condp++; |
| 1155 |
switch (left) { |
| 1156 |
case CCS_ARGV_ENTRY: |
| 1157 |
if (!ccs_io_printf(head, " exec.argv[%u]%s\"%s\"", |
| 1158 |
argv->index, argv->is_not ? |
| 1159 |
"!=" : "=", argv->value->name)) |
| 1160 |
goto out; |
| 1161 |
argv++; |
| 1162 |
continue; |
| 1163 |
case CCS_ENVP_ENTRY: |
| 1164 |
if (!ccs_io_printf(head, " exec.envp[\"%s\"]%s", |
| 1165 |
envp->name->name, envp->is_not ? |
| 1166 |
"!=" : "=")) |
| 1167 |
goto out; |
| 1168 |
if (envp->value) { |
| 1169 |
if (!ccs_io_printf(head, "\"%s\"", |
| 1170 |
envp->value->name)) |
| 1171 |
goto out; |
| 1172 |
} else { |
| 1173 |
if (!ccs_io_printf(head, "NULL")) |
| 1174 |
goto out; |
| 1175 |
} |
| 1176 |
envp++; |
| 1177 |
continue; |
| 1178 |
case CCS_NUMBER_UNION: |
| 1179 |
if (!ccs_print_number_union(head, numbers_p++)) |
| 1180 |
goto out; |
| 1181 |
break; |
| 1182 |
default: |
| 1183 |
if (left >= CCS_MAX_CONDITION_KEYWORD) |
| 1184 |
goto out; |
| 1185 |
if (!ccs_io_printf(head, " %s", |
| 1186 |
ccs_condition_keyword[left])) |
| 1187 |
goto out; |
| 1188 |
break; |
| 1189 |
} |
| 1190 |
if (!ccs_io_printf(head, "%s", match ? "=" : "!=")) |
| 1191 |
goto out; |
| 1192 |
switch (right) { |
| 1193 |
case CCS_NAME_UNION: |
| 1194 |
if (!ccs_print_name_union_quoted(head, names_p++)) |
| 1195 |
goto out; |
| 1196 |
break; |
| 1197 |
case CCS_NUMBER_UNION: |
| 1198 |
if (!ccs_print_number_union_nospace(head, numbers_p++)) |
| 1199 |
goto out; |
| 1200 |
break; |
| 1201 |
default: |
| 1202 |
if (right >= CCS_MAX_CONDITION_KEYWORD) |
| 1203 |
goto out; |
| 1204 |
if (!ccs_io_printf(head, "%s", |
| 1205 |
ccs_condition_keyword[right])) |
| 1206 |
goto out; |
| 1207 |
break; |
| 1208 |
} |
| 1209 |
} |
| 1210 |
i = cond->post_state[3]; |
| 1211 |
if (!i) |
| 1212 |
goto no_condition; |
| 1213 |
if (!ccs_io_printf(head, " ; set")) |
| 1214 |
goto out; |
| 1215 |
for (j = 0; j < 3; j++) { |
| 1216 |
if (!(i & (1 << j))) |
| 1217 |
continue; |
| 1218 |
if (!ccs_io_printf(head, " task.state[%u]=%u", j, |
| 1219 |
cond->post_state[j])) |
| 1220 |
goto out; |
| 1221 |
} |
| 1222 |
if (i & (1 << 4)) { |
| 1223 |
if (!ccs_io_printf(head, " audit=%s", |
| 1224 |
ccs_yesno(cond->post_state[4]))) |
| 1225 |
goto out; |
| 1226 |
} |
| 1227 |
no_condition: |
| 1228 |
if (ccs_io_printf(head, "\n")) |
| 1229 |
return true; |
| 1230 |
out: |
| 1231 |
return false; |
| 1232 |
} |
| 1233 |
|
| 1234 |
/** |
| 1235 |
* ccs_print_entry - Print an ACL entry. |
| 1236 |
* |
| 1237 |
* @head: Pointer to "struct ccs_io_buffer". |
| 1238 |
* @ptr: Pointer to an ACL entry. |
| 1239 |
* |
| 1240 |
* Returns true on success, false otherwise. |
| 1241 |
*/ |
| 1242 |
static bool ccs_print_entry(struct ccs_io_buffer *head, |
| 1243 |
const struct ccs_acl_info *acl) |
| 1244 |
{ |
| 1245 |
int pos; |
| 1246 |
const u8 acl_type = acl->type; |
| 1247 |
u8 bit = head->read_bit; |
| 1248 |
if (head->read_cond) |
| 1249 |
goto print_cond; |
| 1250 |
if (acl->is_deleted) |
| 1251 |
return true; |
| 1252 |
next: |
| 1253 |
pos = head->read_avail; |
| 1254 |
if (acl_type == CCS_TYPE_PATH_ACL) { |
| 1255 |
struct ccs_path_acl *ptr |
| 1256 |
= container_of(acl, typeof(*ptr), head); |
| 1257 |
const u16 perm = ptr->perm; |
| 1258 |
for ( ; bit < CCS_MAX_PATH_OPERATION; bit++) { |
| 1259 |
if (!(perm & (1 << bit))) |
| 1260 |
continue; |
| 1261 |
if (head->read_execute_only && bit != CCS_TYPE_EXECUTE |
| 1262 |
&& bit != CCS_TYPE_TRANSIT) |
| 1263 |
continue; |
| 1264 |
/* Print "read/write" instead of "read" and "write". */ |
| 1265 |
if ((bit == CCS_TYPE_READ || bit == CCS_TYPE_WRITE) |
| 1266 |
&& (perm & (1 << CCS_TYPE_READ_WRITE))) |
| 1267 |
continue; |
| 1268 |
break; |
| 1269 |
} |
| 1270 |
if (bit == CCS_MAX_PATH_OPERATION) |
| 1271 |
goto done; |
| 1272 |
if (!ccs_io_printf(head, "allow_%s", ccs_path_keyword[bit]) || |
| 1273 |
!ccs_print_name_union(head, &ptr->name)) |
| 1274 |
goto fail; |
| 1275 |
} else if (acl_type == CCS_TYPE_EXECUTE_HANDLER || |
| 1276 |
acl_type == CCS_TYPE_DENIED_EXECUTE_HANDLER) { |
| 1277 |
struct ccs_execute_handler *ptr |
| 1278 |
= container_of(acl, typeof(*ptr), head); |
| 1279 |
if (!ccs_io_printf(head, "%s %s", |
| 1280 |
acl_type == CCS_TYPE_EXECUTE_HANDLER ? |
| 1281 |
CCS_KEYWORD_EXECUTE_HANDLER : |
| 1282 |
CCS_KEYWORD_DENIED_EXECUTE_HANDLER, |
| 1283 |
ptr->handler->name)) |
| 1284 |
goto fail; |
| 1285 |
} if (head->read_execute_only) { |
| 1286 |
return true; |
| 1287 |
} else if (acl_type == CCS_TYPE_MKDEV_ACL) { |
| 1288 |
struct ccs_mkdev_acl *ptr |
| 1289 |
= container_of(acl, typeof(*ptr), head); |
| 1290 |
const u8 perm = ptr->perm; |
| 1291 |
for ( ; bit < CCS_MAX_MKDEV_OPERATION; bit++) { |
| 1292 |
if (!(perm & (1 << bit))) |
| 1293 |
continue; |
| 1294 |
break; |
| 1295 |
} |
| 1296 |
if (bit == CCS_MAX_MKDEV_OPERATION) |
| 1297 |
goto done; |
| 1298 |
if (!ccs_io_printf(head, "allow_%s", ccs_mkdev_keyword[bit]) || |
| 1299 |
!ccs_print_name_union(head, &ptr->name) || |
| 1300 |
!ccs_print_number_union(head, &ptr->mode) || |
| 1301 |
!ccs_print_number_union(head, &ptr->major) || |
| 1302 |
!ccs_print_number_union(head, &ptr->minor)) |
| 1303 |
goto fail; |
| 1304 |
} else if (acl_type == CCS_TYPE_PATH2_ACL) { |
| 1305 |
struct ccs_path2_acl *ptr |
| 1306 |
= container_of(acl, typeof(*ptr), head); |
| 1307 |
const u8 perm = ptr->perm; |
| 1308 |
for ( ; bit < CCS_MAX_PATH2_OPERATION; bit++) { |
| 1309 |
if (!(perm & (1 << bit))) |
| 1310 |
continue; |
| 1311 |
break; |
| 1312 |
} |
| 1313 |
if (bit == CCS_MAX_PATH2_OPERATION) |
| 1314 |
goto done; |
| 1315 |
if (!ccs_io_printf(head, "allow_%s", ccs_path2_keyword[bit]) || |
| 1316 |
!ccs_print_name_union(head, &ptr->name1) || |
| 1317 |
!ccs_print_name_union(head, &ptr->name2)) |
| 1318 |
goto fail; |
| 1319 |
} else if (acl_type == CCS_TYPE_PATH_NUMBER_ACL) { |
| 1320 |
struct ccs_path_number_acl *ptr |
| 1321 |
= container_of(acl, typeof(*ptr), head); |
| 1322 |
const u8 perm = ptr->perm; |
| 1323 |
for ( ; bit < CCS_MAX_PATH_NUMBER_OPERATION; bit++) { |
| 1324 |
if (!(perm & (1 << bit))) |
| 1325 |
continue; |
| 1326 |
break; |
| 1327 |
} |
| 1328 |
if (bit == CCS_MAX_PATH_NUMBER_OPERATION) |
| 1329 |
goto done; |
| 1330 |
if (!ccs_io_printf(head, "allow_%s", |
| 1331 |
ccs_path_number_keyword[bit]) || |
| 1332 |
!ccs_print_name_union(head, &ptr->name) || |
| 1333 |
!ccs_print_number_union(head, &ptr->number)) |
| 1334 |
goto fail; |
| 1335 |
} else if (acl_type == CCS_TYPE_ENV_ACL) { |
| 1336 |
struct ccs_env_acl *ptr |
| 1337 |
= container_of(acl, typeof(*ptr), head); |
| 1338 |
if (!ccs_io_printf(head, CCS_KEYWORD_ALLOW_ENV "%s", |
| 1339 |
ptr->env->name)) |
| 1340 |
goto fail; |
| 1341 |
} else if (acl_type == CCS_TYPE_CAPABILITY_ACL) { |
| 1342 |
struct ccs_capability_acl *ptr |
| 1343 |
= container_of(acl, typeof(*ptr), head); |
| 1344 |
if (!ccs_io_printf(head, CCS_KEYWORD_ALLOW_CAPABILITY "%s", |
| 1345 |
ccs_cap2keyword(ptr->operation))) |
| 1346 |
goto fail; |
| 1347 |
} else if (acl_type == CCS_TYPE_IP_NETWORK_ACL) { |
| 1348 |
struct ccs_ip_network_acl *ptr |
| 1349 |
= container_of(acl, typeof(*ptr), head); |
| 1350 |
char buf[128]; |
| 1351 |
const char *w[2] = { buf, "" }; |
| 1352 |
const u8 perm = ptr->perm; |
| 1353 |
for ( ; bit < CCS_MAX_NETWORK_OPERATION; bit++) { |
| 1354 |
if (!(perm & (1 << bit))) |
| 1355 |
continue; |
| 1356 |
break; |
| 1357 |
} |
| 1358 |
if (bit == CCS_MAX_NETWORK_OPERATION) |
| 1359 |
goto done; |
| 1360 |
switch (ptr->address_type) { |
| 1361 |
case CCS_IP_ADDRESS_TYPE_ADDRESS_GROUP: |
| 1362 |
w[0] = "@"; |
| 1363 |
w[1] = ptr->address.group->group_name->name; |
| 1364 |
break; |
| 1365 |
case CCS_IP_ADDRESS_TYPE_IPv4: |
| 1366 |
ccs_print_ipv4(buf, sizeof(buf), ptr->address.ipv4.min, |
| 1367 |
ptr->address.ipv4.max); |
| 1368 |
break; |
| 1369 |
case CCS_IP_ADDRESS_TYPE_IPv6: |
| 1370 |
ccs_print_ipv6(buf, sizeof(buf), ptr->address.ipv6.min, |
| 1371 |
ptr->address.ipv6.max); |
| 1372 |
break; |
| 1373 |
} |
| 1374 |
if (!ccs_io_printf(head, CCS_KEYWORD_ALLOW_NETWORK "%s %s%s", |
| 1375 |
ccs_net_keyword[bit], w[0], w[1]) || |
| 1376 |
!ccs_print_number_union(head, &ptr->port)) |
| 1377 |
goto fail; |
| 1378 |
} else if (acl_type == CCS_TYPE_SIGNAL_ACL) { |
| 1379 |
struct ccs_signal_acl *ptr |
| 1380 |
= container_of(acl, typeof(*ptr), head); |
| 1381 |
if (!ccs_io_printf(head, CCS_KEYWORD_ALLOW_SIGNAL "%u %s", |
| 1382 |
ptr->sig, ptr->domainname->name)) |
| 1383 |
goto fail; |
| 1384 |
} else if (acl_type == CCS_TYPE_MOUNT_ACL) { |
| 1385 |
struct ccs_mount_acl *ptr |
| 1386 |
= container_of(acl, typeof(*ptr), head); |
| 1387 |
if (!ccs_io_printf(head, CCS_KEYWORD_ALLOW_MOUNT) || |
| 1388 |
!ccs_print_name_union(head, &ptr->dev_name) || |
| 1389 |
!ccs_print_name_union(head, &ptr->dir_name) || |
| 1390 |
!ccs_print_name_union(head, &ptr->fs_type) || |
| 1391 |
!ccs_print_number_union(head, &ptr->flags)) |
| 1392 |
goto fail; |
| 1393 |
} |
| 1394 |
head->read_bit = bit; |
| 1395 |
head->read_cond = true; |
| 1396 |
print_cond: |
| 1397 |
pos = head->read_avail; |
| 1398 |
if (!ccs_print_condition(head, acl->cond)) { |
| 1399 |
head->read_avail = pos; |
| 1400 |
return false; |
| 1401 |
} |
| 1402 |
head->read_cond = false; |
| 1403 |
switch (acl_type) { |
| 1404 |
case CCS_TYPE_PATH_ACL: |
| 1405 |
case CCS_TYPE_MKDEV_ACL: |
| 1406 |
case CCS_TYPE_PATH2_ACL: |
| 1407 |
case CCS_TYPE_PATH_NUMBER_ACL: |
| 1408 |
case CCS_TYPE_IP_NETWORK_ACL: |
| 1409 |
bit++; |
| 1410 |
goto next; |
| 1411 |
} |
| 1412 |
done: |
| 1413 |
head->read_bit = 0; |
| 1414 |
return true; |
| 1415 |
fail: |
| 1416 |
head->read_bit = bit; |
| 1417 |
head->read_avail = pos; |
| 1418 |
return false; |
| 1419 |
} |
| 1420 |
|
| 1421 |
/** |
| 1422 |
* ccs_read_domain2 - Read domain policy. |
| 1423 |
* |
| 1424 |
* @head: Pointer to "struct ccs_io_buffer". |
| 1425 |
* @domain: Pointer to "struct ccs_domain_info". |
| 1426 |
* |
| 1427 |
* Caller holds ccs_read_lock(). |
| 1428 |
* |
| 1429 |
* Returns true on success, false otherwise. |
| 1430 |
*/ |
| 1431 |
static bool ccs_read_domain2(struct ccs_io_buffer *head, |
| 1432 |
struct ccs_domain_info *domain) |
| 1433 |
{ |
| 1434 |
struct list_head *pos; |
| 1435 |
/* Print ACL entries in the domain. */ |
| 1436 |
list_for_each_cookie(pos, head->read_var2, &domain->acl_info_list) { |
| 1437 |
struct ccs_acl_info *ptr |
| 1438 |
= list_entry(pos, struct ccs_acl_info, list); |
| 1439 |
if (!ccs_print_entry(head, ptr)) |
| 1440 |
return false; |
| 1441 |
} |
| 1442 |
return true; |
| 1443 |
} |
| 1444 |
|
| 1445 |
/** |
| 1446 |
* ccs_read_domain - Read domain policy. |
| 1447 |
* |
| 1448 |
* @head: Pointer to "struct ccs_io_buffer". |
| 1449 |
* |
| 1450 |
* Caller holds ccs_read_lock(). |
| 1451 |
*/ |
| 1452 |
static void ccs_read_domain(struct ccs_io_buffer *head) |
| 1453 |
{ |
| 1454 |
struct list_head *pos; |
| 1455 |
if (head->read_eof) |
| 1456 |
return; |
| 1457 |
list_for_each_cookie(pos, head->read_var1, &ccs_domain_list) { |
| 1458 |
struct ccs_domain_info *domain = |
| 1459 |
list_entry(pos, struct ccs_domain_info, list); |
| 1460 |
switch (head->read_step) { |
| 1461 |
u8 i; |
| 1462 |
const char *w[CCS_MAX_DOMAIN_INFO_FLAGS]; |
| 1463 |
case 0: |
| 1464 |
if (domain->is_deleted && !head->read_single_domain) |
| 1465 |
continue; |
| 1466 |
/* Print domainname and flags. */ |
| 1467 |
for (i = 0; i < CCS_MAX_DOMAIN_INFO_FLAGS; i++) |
| 1468 |
w[i] = domain->flags[i] ? ccs_dif[i] : ""; |
| 1469 |
if (!ccs_io_printf(head, "%s\n" CCS_KEYWORD_USE_PROFILE |
| 1470 |
"%u\n%s%s%s%s%s\n", |
| 1471 |
domain->domainname->name, |
| 1472 |
domain->profile, |
| 1473 |
w[CCS_DIF_QUOTA_WARNED], |
| 1474 |
w[CCS_DIF_IGNORE_GLOBAL], |
| 1475 |
w[CCS_DIF_IGNORE_GLOBAL_ALLOW_READ], |
| 1476 |
w[CCS_DIF_IGNORE_GLOBAL_ALLOW_ENV], |
| 1477 |
w[CCS_DIF_TRANSITION_FAILED])) |
| 1478 |
return; |
| 1479 |
head->read_step++; |
| 1480 |
/* fall through */ |
| 1481 |
case 1: |
| 1482 |
if (!ccs_read_domain2(head, domain)) |
| 1483 |
return; |
| 1484 |
head->read_step++; |
| 1485 |
/* fall through */ |
| 1486 |
case 2: |
| 1487 |
if (!ccs_io_printf(head, "\n")) |
| 1488 |
return; |
| 1489 |
head->read_step = 0; |
| 1490 |
if (head->read_single_domain) |
| 1491 |
goto out; |
| 1492 |
} |
| 1493 |
} |
| 1494 |
out: |
| 1495 |
head->read_eof = true; |
| 1496 |
} |
| 1497 |
|
| 1498 |
/** |
| 1499 |
* ccs_write_domain_profile - Assign profile for specified domain. |
| 1500 |
* |
| 1501 |
* @head: Pointer to "struct ccs_io_buffer". |
| 1502 |
* |
| 1503 |
* Returns 0 on success, -EINVAL otherwise. |
| 1504 |
* |
| 1505 |
* This is equivalent to doing |
| 1506 |
* |
| 1507 |
* ( echo "select " $domainname; echo "use_profile " $profile ) | |
| 1508 |
* /usr/sbin/ccs-loadpolicy -d |
| 1509 |
* |
| 1510 |
* Caller holds ccs_read_lock(). |
| 1511 |
*/ |
| 1512 |
static int ccs_write_domain_profile(struct ccs_io_buffer *head) |
| 1513 |
{ |
| 1514 |
char *data = head->write_buf; |
| 1515 |
char *cp = strchr(data, ' '); |
| 1516 |
struct ccs_domain_info *domain; |
| 1517 |
unsigned int profile; |
| 1518 |
if (!cp) |
| 1519 |
return -EINVAL; |
| 1520 |
*cp = '\0'; |
| 1521 |
profile = simple_strtoul(data, NULL, 10); |
| 1522 |
if (profile >= CCS_MAX_PROFILES) |
| 1523 |
return -EINVAL; |
| 1524 |
domain = ccs_find_domain(cp + 1); |
| 1525 |
if (domain && (!ccs_policy_loaded || ccs_profile_ptr[(u8) profile])) |
| 1526 |
domain->profile = (u8) profile; |
| 1527 |
return 0; |
| 1528 |
} |
| 1529 |
|
| 1530 |
/** |
| 1531 |
* ccs_read_domain_profile - Read only domainname and profile. |
| 1532 |
* |
| 1533 |
* @head: Pointer to "struct ccs_io_buffer". |
| 1534 |
* |
| 1535 |
* This is equivalent to doing |
| 1536 |
* |
| 1537 |
* grep -A 1 '^<kernel>' /proc/ccs/domain_policy | |
| 1538 |
* awk ' { if ( domainname == "" ) { if ( $1 == "<kernel>" ) |
| 1539 |
* domainname = $0; } else if ( $1 == "use_profile" ) { |
| 1540 |
* print $2 " " domainname; domainname = ""; } } ; ' |
| 1541 |
* |
| 1542 |
* Caller holds ccs_read_lock(). |
| 1543 |
*/ |
| 1544 |
static void ccs_read_domain_profile(struct ccs_io_buffer *head) |
| 1545 |
{ |
| 1546 |
struct list_head *pos; |
| 1547 |
if (head->read_eof) |
| 1548 |
return; |
| 1549 |
list_for_each_cookie(pos, head->read_var1, &ccs_domain_list) { |
| 1550 |
struct ccs_domain_info *domain; |
| 1551 |
domain = list_entry(pos, struct ccs_domain_info, list); |
| 1552 |
if (domain->is_deleted) |
| 1553 |
continue; |
| 1554 |
if (!ccs_io_printf(head, "%u %s\n", domain->profile, |
| 1555 |
domain->domainname->name)) |
| 1556 |
return; |
| 1557 |
} |
| 1558 |
head->read_eof = true; |
| 1559 |
} |
| 1560 |
|
| 1561 |
/** |
| 1562 |
* ccs_write_pid: Specify PID to obtain domainname. |
| 1563 |
* |
| 1564 |
* @head: Pointer to "struct ccs_io_buffer". |
| 1565 |
* |
| 1566 |
* Returns 0. |
| 1567 |
*/ |
| 1568 |
static int ccs_write_pid(struct ccs_io_buffer *head) |
| 1569 |
{ |
| 1570 |
head->read_eof = false; |
| 1571 |
return 0; |
| 1572 |
} |
| 1573 |
|
| 1574 |
/** |
| 1575 |
* ccs_read_pid - Read information of a process. |
| 1576 |
* |
| 1577 |
* @head: Pointer to "struct ccs_io_buffer". |
| 1578 |
* |
| 1579 |
* Returns the domainname which the specified PID is in or |
| 1580 |
* process information of the specified PID on success, |
| 1581 |
* empty string otherwise. |
| 1582 |
* |
| 1583 |
* Caller holds ccs_read_lock(). |
| 1584 |
*/ |
| 1585 |
static void ccs_read_pid(struct ccs_io_buffer *head) |
| 1586 |
{ |
| 1587 |
char *buf = head->write_buf; |
| 1588 |
bool task_info = false; |
| 1589 |
bool global_pid = false; |
| 1590 |
unsigned int pid; |
| 1591 |
struct task_struct *p; |
| 1592 |
struct ccs_domain_info *domain = NULL; |
| 1593 |
u32 ccs_flags = 0; |
| 1594 |
/* Accessing write_buf is safe because head->io_sem is held. */ |
| 1595 |
if (!buf) { |
| 1596 |
head->read_eof = true; |
| 1597 |
return; /* Do nothing if open(O_RDONLY). */ |
| 1598 |
} |
| 1599 |
if (head->read_avail || head->read_eof) |
| 1600 |
return; |
| 1601 |
head->read_eof = true; |
| 1602 |
if (ccs_str_starts(&buf, "info ")) |
| 1603 |
task_info = true; |
| 1604 |
if (ccs_str_starts(&buf, "global-pid ")) |
| 1605 |
global_pid = true; |
| 1606 |
pid = (unsigned int) simple_strtoul(buf, NULL, 10); |
| 1607 |
ccs_tasklist_lock(); |
| 1608 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 24) |
| 1609 |
if (global_pid) |
| 1610 |
p = ccsecurity_exports.find_task_by_pid_ns(pid, &init_pid_ns); |
| 1611 |
else |
| 1612 |
p = ccsecurity_exports.find_task_by_vpid(pid); |
| 1613 |
#else |
| 1614 |
p = find_task_by_pid(pid); |
| 1615 |
#endif |
| 1616 |
if (p) { |
| 1617 |
domain = ccs_task_domain(p); |
| 1618 |
ccs_flags = p->ccs_flags; |
| 1619 |
} |
| 1620 |
ccs_tasklist_unlock(); |
| 1621 |
if (!domain) |
| 1622 |
return; |
| 1623 |
if (!task_info) |
| 1624 |
ccs_io_printf(head, "%u %u %s", pid, domain->profile, |
| 1625 |
domain->domainname->name); |
| 1626 |
else |
| 1627 |
ccs_io_printf(head, "%u manager=%s execute_handler=%s " |
| 1628 |
"state[0]=%u state[1]=%u state[2]=%u", pid, |
| 1629 |
ccs_yesno(ccs_flags & |
| 1630 |
CCS_TASK_IS_MANAGER), |
| 1631 |
ccs_yesno(ccs_flags & |
| 1632 |
CCS_TASK_IS_EXECUTE_HANDLER), |
| 1633 |
(u8) (ccs_flags >> 24), |
| 1634 |
(u8) (ccs_flags >> 16), |
| 1635 |
(u8) (ccs_flags >> 8)); |
| 1636 |
} |
| 1637 |
|
| 1638 |
static const char *ccs_transition_type[CCS_MAX_TRANSITION_TYPE] = { |
| 1639 |
[CCS_TRANSITION_CONTROL_NO_INITIALIZE] |
| 1640 |
= CCS_KEYWORD_NO_INITIALIZE_DOMAIN, |
| 1641 |
[CCS_TRANSITION_CONTROL_INITIALIZE] = CCS_KEYWORD_INITIALIZE_DOMAIN, |
| 1642 |
[CCS_TRANSITION_CONTROL_NO_KEEP] = CCS_KEYWORD_NO_KEEP_DOMAIN, |
| 1643 |
[CCS_TRANSITION_CONTROL_KEEP] = CCS_KEYWORD_KEEP_DOMAIN |
| 1644 |
}; |
| 1645 |
|
| 1646 |
static const char *ccs_group_name[CCS_MAX_GROUP] = { |
| 1647 |
[CCS_PATH_GROUP] = CCS_KEYWORD_PATH_GROUP, |
| 1648 |
[CCS_NUMBER_GROUP] = CCS_KEYWORD_NUMBER_GROUP, |
| 1649 |
[CCS_ADDRESS_GROUP] = CCS_KEYWORD_ADDRESS_GROUP |
| 1650 |
}; |
| 1651 |
|
| 1652 |
/** |
| 1653 |
* ccs_write_exception - Write exception policy. |
| 1654 |
* |
| 1655 |
* @head: Pointer to "struct ccs_io_buffer". |
| 1656 |
* |
| 1657 |
* Returns 0 on success, negative value otherwise. |
| 1658 |
*/ |
| 1659 |
static int ccs_write_exception(struct ccs_io_buffer *head) |
| 1660 |
{ |
| 1661 |
char *data = head->write_buf; |
| 1662 |
const bool is_delete = ccs_str_starts(&data, CCS_KEYWORD_DELETE); |
| 1663 |
u8 i; |
| 1664 |
static const struct { |
| 1665 |
const char *keyword; |
| 1666 |
int (*write) (char *, const bool); |
| 1667 |
} ccs_callback[4] = { |
| 1668 |
{ CCS_KEYWORD_AGGREGATOR, ccs_write_aggregator }, |
| 1669 |
{ CCS_KEYWORD_FILE_PATTERN, ccs_write_pattern }, |
| 1670 |
{ CCS_KEYWORD_DENY_REWRITE, ccs_write_no_rewrite }, |
| 1671 |
{ CCS_KEYWORD_DENY_AUTOBIND, ccs_write_reserved_port } |
| 1672 |
}; |
| 1673 |
for (i = 0; i < 4; i++) { |
| 1674 |
if (ccs_str_starts(&data, ccs_callback[i].keyword)) |
| 1675 |
return ccs_callback[i].write(data, is_delete); |
| 1676 |
} |
| 1677 |
for (i = 0; i < CCS_MAX_TRANSITION_TYPE; i++) { |
| 1678 |
if (ccs_str_starts(&data, ccs_transition_type[i])) |
| 1679 |
return ccs_write_transition_control(data, is_delete, |
| 1680 |
i); |
| 1681 |
} |
| 1682 |
for (i = 0; i < CCS_MAX_GROUP; i++) { |
| 1683 |
if (ccs_str_starts(&data, ccs_group_name[i])) |
| 1684 |
return ccs_write_group(data, is_delete, i); |
| 1685 |
} |
| 1686 |
return ccs_write_domain2(data, &ccs_global_domain, is_delete); |
| 1687 |
} |
| 1688 |
|
| 1689 |
/** |
| 1690 |
* ccs_read_group - Read "struct ccs_path_group"/"struct ccs_number_group"/"struct ccs_address_group" list. |
| 1691 |
* |
| 1692 |
* @head: Pointer to "struct ccs_io_buffer". |
| 1693 |
* @idx: Index number. |
| 1694 |
* |
| 1695 |
* Returns true on success, false otherwise. |
| 1696 |
* |
| 1697 |
* Caller holds ccs_read_lock(). |
| 1698 |
*/ |
| 1699 |
static bool ccs_read_group(struct ccs_io_buffer *head, const int idx) |
| 1700 |
{ |
| 1701 |
struct list_head *gpos; |
| 1702 |
struct list_head *mpos; |
| 1703 |
const char *w[3] = { "", "", "" }; |
| 1704 |
w[0] = ccs_group_name[idx]; |
| 1705 |
list_for_each_cookie(gpos, head->read_var1, &ccs_group_list[idx]) { |
| 1706 |
struct ccs_group *group = |
| 1707 |
list_entry(gpos, struct ccs_group, head.list); |
| 1708 |
w[1] = group->group_name->name; |
| 1709 |
list_for_each_cookie(mpos, head->read_var2, |
| 1710 |
&group->member_list) { |
| 1711 |
char buffer[128]; |
| 1712 |
struct ccs_acl_head *ptr = |
| 1713 |
list_entry(mpos, struct ccs_acl_head, list); |
| 1714 |
if (ptr->is_deleted) |
| 1715 |
continue; |
| 1716 |
w[2] = buffer; |
| 1717 |
if (idx == CCS_PATH_GROUP) { |
| 1718 |
w[2] = container_of(ptr, struct ccs_path_group, |
| 1719 |
head)->member_name->name; |
| 1720 |
} else if (idx == CCS_NUMBER_GROUP) { |
| 1721 |
ccs_print_number(buffer, sizeof(buffer), |
| 1722 |
&container_of |
| 1723 |
(ptr, struct ccs_number_group, |
| 1724 |
head)->number); |
| 1725 |
} else if (idx == CCS_ADDRESS_GROUP) { |
| 1726 |
struct ccs_address_group *member = |
| 1727 |
container_of(ptr, typeof(*member), |
| 1728 |
head); |
| 1729 |
if (member->is_ipv6) |
| 1730 |
ccs_print_ipv6(buffer, sizeof(buffer), |
| 1731 |
member->min.ipv6, |
| 1732 |
member->max.ipv6); |
| 1733 |
else |
| 1734 |
ccs_print_ipv4(buffer, sizeof(buffer), |
| 1735 |
member->min.ipv4, |
| 1736 |
member->max.ipv4); |
| 1737 |
} |
| 1738 |
if (!ccs_io_printf(head, "%s%s %s\n", w[0], w[1], |
| 1739 |
w[2])) |
| 1740 |
return false; |
| 1741 |
} |
| 1742 |
} |
| 1743 |
return true; |
| 1744 |
} |
| 1745 |
|
| 1746 |
/** |
| 1747 |
* ccs_read_policy - Read "struct ccs_..._entry" list. |
| 1748 |
* |
| 1749 |
* @head: Pointer to "struct ccs_io_buffer". |
| 1750 |
* @idx: Index number. |
| 1751 |
* |
| 1752 |
* Returns true on success, false otherwise. |
| 1753 |
* |
| 1754 |
* Caller holds ccs_read_lock(). |
| 1755 |
*/ |
| 1756 |
static bool ccs_read_policy(struct ccs_io_buffer *head, const int idx) |
| 1757 |
{ |
| 1758 |
struct list_head *pos; |
| 1759 |
list_for_each_cookie(pos, head->read_var2, &ccs_policy_list[idx]) { |
| 1760 |
const char *w[4] = { "", "", "", "" }; |
| 1761 |
char buffer[16]; |
| 1762 |
struct ccs_acl_head *acl = container_of(pos, typeof(*acl), |
| 1763 |
list); |
| 1764 |
if (acl->is_deleted) |
| 1765 |
continue; |
| 1766 |
switch (idx) { |
| 1767 |
case CCS_ID_TRANSITION_CONTROL: |
| 1768 |
{ |
| 1769 |
struct ccs_transition_control *ptr = |
| 1770 |
container_of(acl, typeof(*ptr), head); |
| 1771 |
w[0] = ccs_transition_type[ptr->type]; |
| 1772 |
w[1] = ptr->program ? ptr->program->name |
| 1773 |
: "any"; |
| 1774 |
w[2] = " from "; |
| 1775 |
w[3] = ptr->domainname ? ptr->domainname->name |
| 1776 |
: "any"; |
| 1777 |
} |
| 1778 |
break; |
| 1779 |
case CCS_ID_AGGREGATOR: |
| 1780 |
{ |
| 1781 |
struct ccs_aggregator *ptr = |
| 1782 |
container_of(acl, typeof(*ptr), head); |
| 1783 |
w[0] = CCS_KEYWORD_AGGREGATOR; |
| 1784 |
w[1] = ptr->original_name->name; |
| 1785 |
w[2] = " "; |
| 1786 |
w[3] = ptr->aggregated_name->name; |
| 1787 |
} |
| 1788 |
break; |
| 1789 |
case CCS_ID_PATTERN: |
| 1790 |
{ |
| 1791 |
struct ccs_pattern *ptr = |
| 1792 |
container_of(acl, typeof(*ptr), head); |
| 1793 |
w[0] = CCS_KEYWORD_FILE_PATTERN; |
| 1794 |
w[1] = ptr->pattern->name; |
| 1795 |
} |
| 1796 |
break; |
| 1797 |
case CCS_ID_NO_REWRITE: |
| 1798 |
{ |
| 1799 |
struct ccs_no_rewrite *ptr = |
| 1800 |
container_of(acl, typeof(*ptr), head); |
| 1801 |
w[0] = CCS_KEYWORD_DENY_REWRITE; |
| 1802 |
w[1] = ptr->pattern->name; |
| 1803 |
} |
| 1804 |
break; |
| 1805 |
case CCS_ID_RESERVEDPORT: |
| 1806 |
{ |
| 1807 |
struct ccs_reserved *ptr = |
| 1808 |
container_of(acl, typeof(*ptr), head); |
| 1809 |
const u16 min_port = ptr->min_port; |
| 1810 |
const u16 max_port = ptr->max_port; |
| 1811 |
w[0] = CCS_KEYWORD_DENY_AUTOBIND; |
| 1812 |
snprintf(buffer, sizeof(buffer) - 1, "%u%c%u", |
| 1813 |
min_port, min_port != max_port ? |
| 1814 |
'-' : '\0', max_port); |
| 1815 |
buffer[sizeof(buffer) - 1] = '\0'; |
| 1816 |
w[1] = buffer; |
| 1817 |
} |
| 1818 |
break; |
| 1819 |
default: |
| 1820 |
continue; |
| 1821 |
} |
| 1822 |
if (!ccs_io_printf(head, "%s%s%s%s\n", w[0], w[1], w[2], w[3])) |
| 1823 |
return false; |
| 1824 |
} |
| 1825 |
return true; |
| 1826 |
} |
| 1827 |
|
| 1828 |
static void ccs_read_global_domain(struct ccs_io_buffer *head) |
| 1829 |
{ |
| 1830 |
if (!head->read_eof) |
| 1831 |
head->read_eof = ccs_read_domain2(head, &ccs_global_domain); |
| 1832 |
} |
| 1833 |
|
| 1834 |
/** |
| 1835 |
* ccs_read_exception - Read exception policy. |
| 1836 |
* |
| 1837 |
* @head: Pointer to "struct ccs_io_buffer". |
| 1838 |
* |
| 1839 |
* Caller holds ccs_read_lock(). |
| 1840 |
*/ |
| 1841 |
static void ccs_read_exception(struct ccs_io_buffer *head) |
| 1842 |
{ |
| 1843 |
if (head->read_eof) |
| 1844 |
return; |
| 1845 |
while (head->read_step < CCS_MAX_POLICY && |
| 1846 |
ccs_read_policy(head, head->read_step)) |
| 1847 |
head->read_step++; |
| 1848 |
if (head->read_step < CCS_MAX_POLICY) |
| 1849 |
return; |
| 1850 |
while (head->read_step < CCS_MAX_POLICY + CCS_MAX_GROUP && |
| 1851 |
ccs_read_group(head, head->read_step - CCS_MAX_POLICY)) |
| 1852 |
head->read_step++; |
| 1853 |
if (head->read_step < CCS_MAX_POLICY + CCS_MAX_GROUP) |
| 1854 |
return; |
| 1855 |
head->read = ccs_read_global_domain; |
| 1856 |
} |
| 1857 |
|
| 1858 |
/* Wait queue for ccs_query_list. */ |
| 1859 |
static DECLARE_WAIT_QUEUE_HEAD(ccs_query_wait); |
| 1860 |
|
| 1861 |
/* Lock for manipulating ccs_query_list. */ |
| 1862 |
static DEFINE_SPINLOCK(ccs_query_list_lock); |
| 1863 |
|
| 1864 |
/* Structure for query. */ |
| 1865 |
struct ccs_query_entry { |
| 1866 |
struct list_head list; |
| 1867 |
char *query; |
| 1868 |
int query_len; |
| 1869 |
unsigned int serial; |
| 1870 |
int timer; |
| 1871 |
int answer; |
| 1872 |
}; |
| 1873 |
|
| 1874 |
/* The list for "struct ccs_query_entry". */ |
| 1875 |
static LIST_HEAD(ccs_query_list); |
| 1876 |
|
| 1877 |
/* Number of "struct file" referring /proc/ccs/query interface. */ |
| 1878 |
static atomic_t ccs_query_observers = ATOMIC_INIT(0); |
| 1879 |
|
| 1880 |
static void ccs_addprintf(char *buffer, int len, const char *fmt, ...) |
| 1881 |
{ |
| 1882 |
va_list args; |
| 1883 |
const int pos = strlen(buffer); |
| 1884 |
va_start(args, fmt); |
| 1885 |
vsnprintf(buffer + pos, len - pos - 1, fmt, args); |
| 1886 |
va_end(args); |
| 1887 |
} |
| 1888 |
|
| 1889 |
static void ccs_truncate(char *str) |
| 1890 |
{ |
| 1891 |
while (* (unsigned char *) str > (unsigned char) ' ') |
| 1892 |
str++; |
| 1893 |
*str = '\0'; |
| 1894 |
} |
| 1895 |
|
| 1896 |
/** |
| 1897 |
* ccs_supervisor - Ask for the supervisor's decision. |
| 1898 |
* |
| 1899 |
* @r: Pointer to "struct ccs_request_info". |
| 1900 |
* @fmt: The printf()'s format string, followed by parameters. |
| 1901 |
* |
| 1902 |
* Returns 0 if the supervisor decided to permit the access request which |
| 1903 |
* violated the policy in enforcing mode, CCS_RETRY_REQUEST if the supervisor |
| 1904 |
* decided to retry the access request which violated the policy in enforcing |
| 1905 |
* mode, 0 if it is not in enforcing mode, -EPERM otherwise. |
| 1906 |
*/ |
| 1907 |
int ccs_supervisor(struct ccs_request_info *r, const char *fmt, ...) |
| 1908 |
{ |
| 1909 |
va_list args; |
| 1910 |
int error = -EPERM; |
| 1911 |
int pos; |
| 1912 |
int len; |
| 1913 |
static unsigned int ccs_serial; |
| 1914 |
struct ccs_query_entry *ccs_query_entry = NULL; |
| 1915 |
bool quota_exceeded = false; |
| 1916 |
char *header; |
| 1917 |
struct ccs_domain_info * const domain = ccs_current_domain(); |
| 1918 |
va_start(args, fmt); |
| 1919 |
len = vsnprintf((char *) &pos, sizeof(pos) - 1, fmt, args) + 80; |
| 1920 |
va_end(args); |
| 1921 |
if (r->mode == CCS_CONFIG_LEARNING) { |
| 1922 |
char *buffer; |
| 1923 |
char *realpath = NULL; |
| 1924 |
char *argv0 = NULL; |
| 1925 |
char *symlink = NULL; |
| 1926 |
char *handler = NULL; |
| 1927 |
const struct ccs_preference *pref; |
| 1928 |
if (!ccs_domain_quota_ok(r)) |
| 1929 |
return 0; |
| 1930 |
header = ccs_init_log(&len, r); |
| 1931 |
if (!header) |
| 1932 |
return 0; |
| 1933 |
pref = ccs_profile(r->profile)->learning; |
| 1934 |
/* strstr() will return NULL if ordering is wrong. */ |
| 1935 |
if (r->param_type == CCS_TYPE_PATH_ACL && |
| 1936 |
r->param.path.operation == CCS_TYPE_EXECUTE) { |
| 1937 |
if (pref->learning_exec_argv0) { |
| 1938 |
argv0 = strstr(header, " argv[]={ \""); |
| 1939 |
if (argv0) { |
| 1940 |
argv0 += 10; |
| 1941 |
ccs_truncate(argv0); |
| 1942 |
} |
| 1943 |
} |
| 1944 |
if (pref->learning_exec_realpath) { |
| 1945 |
realpath = strstr(header, |
| 1946 |
" exec={ realpath=\""); |
| 1947 |
if (realpath) { |
| 1948 |
realpath += 8; |
| 1949 |
ccs_truncate(realpath); |
| 1950 |
} |
| 1951 |
} |
| 1952 |
} else if (r->param_type == CCS_TYPE_PATH_ACL && |
| 1953 |
r->param.path.operation == CCS_TYPE_SYMLINK && |
| 1954 |
pref->learning_symlink_target) { |
| 1955 |
symlink = strstr(header, " symlink.target=\""); |
| 1956 |
if (symlink) |
| 1957 |
ccs_truncate(symlink + 1); |
| 1958 |
} |
| 1959 |
handler = strstr(header, "type=execute_handler"); |
| 1960 |
if (handler) |
| 1961 |
ccs_truncate(handler); |
| 1962 |
buffer = kmalloc(len, CCS_GFP_FLAGS); |
| 1963 |
if (buffer) { |
| 1964 |
va_start(args, fmt); |
| 1965 |
vsnprintf(buffer, len - 1, fmt, args); |
| 1966 |
va_end(args); |
| 1967 |
if (handler || realpath || argv0 || symlink) { |
| 1968 |
ccs_addprintf(buffer, len, " if"); |
| 1969 |
if (handler) |
| 1970 |
ccs_addprintf(buffer, len, " task.%s", |
| 1971 |
handler); |
| 1972 |
if (realpath) |
| 1973 |
ccs_addprintf(buffer, len, " exec.%s", |
| 1974 |
realpath); |
| 1975 |
if (argv0) |
| 1976 |
ccs_addprintf(buffer, len, |
| 1977 |
" exec.argv[0]=%s", |
| 1978 |
argv0); |
| 1979 |
if (symlink) |
| 1980 |
ccs_addprintf(buffer, len, "%s", |
| 1981 |
symlink); |
| 1982 |
} |
| 1983 |
ccs_normalize_line(buffer); |
| 1984 |
ccs_write_domain2(buffer, domain, false); |
| 1985 |
kfree(buffer); |
| 1986 |
} |
| 1987 |
kfree(header); |
| 1988 |
return 0; |
| 1989 |
} |
| 1990 |
if (r->mode != CCS_CONFIG_ENFORCING) |
| 1991 |
return 0; |
| 1992 |
if (!atomic_read(&ccs_query_observers)) { |
| 1993 |
int i; |
| 1994 |
if (current->ccs_flags & CCS_DONT_SLEEP_ON_ENFORCE_ERROR) |
| 1995 |
return -EPERM; |
| 1996 |
for (i = 0; i < ccs_profile(domain->profile)->enforcing-> |
| 1997 |
enforcing_penalty; i++) { |
| 1998 |
set_current_state(TASK_INTERRUPTIBLE); |
| 1999 |
schedule_timeout(HZ / 10); |
| 2000 |
} |
| 2001 |
return -EPERM; |
| 2002 |
} |
| 2003 |
header = ccs_init_log(&len, r); |
| 2004 |
if (!header) |
| 2005 |
goto out; |
| 2006 |
ccs_query_entry = kzalloc(sizeof(*ccs_query_entry), CCS_GFP_FLAGS); |
| 2007 |
if (!ccs_query_entry) |
| 2008 |
goto out; |
| 2009 |
len = ccs_round2(len); |
| 2010 |
ccs_query_entry->query = kzalloc(len, CCS_GFP_FLAGS); |
| 2011 |
if (!ccs_query_entry->query) |
| 2012 |
goto out; |
| 2013 |
INIT_LIST_HEAD(&ccs_query_entry->list); |
| 2014 |
spin_lock(&ccs_query_list_lock); |
| 2015 |
if (ccs_quota_for_query && ccs_query_memory_size + len + |
| 2016 |
sizeof(*ccs_query_entry) >= ccs_quota_for_query) { |
| 2017 |
quota_exceeded = true; |
| 2018 |
} else { |
| 2019 |
ccs_query_memory_size += len + sizeof(*ccs_query_entry); |
| 2020 |
ccs_query_entry->serial = ccs_serial++; |
| 2021 |
} |
| 2022 |
spin_unlock(&ccs_query_list_lock); |
| 2023 |
if (quota_exceeded) |
| 2024 |
goto out; |
| 2025 |
snprintf(ccs_query_entry->query, len - 1, "Q%u-%hu\n%s", |
| 2026 |
ccs_query_entry->serial, r->retry, header); |
| 2027 |
kfree(header); |
| 2028 |
header = NULL; |
| 2029 |
ccs_addprintf(ccs_query_entry->query, len, fmt, args); |
| 2030 |
ccs_query_entry->query_len = strlen(ccs_query_entry->query) + 1; |
| 2031 |
spin_lock(&ccs_query_list_lock); |
| 2032 |
list_add_tail(&ccs_query_entry->list, &ccs_query_list); |
| 2033 |
spin_unlock(&ccs_query_list_lock); |
| 2034 |
/* Give 10 seconds for supervisor's opinion. */ |
| 2035 |
for (ccs_query_entry->timer = 0; |
| 2036 |
atomic_read(&ccs_query_observers) && ccs_query_entry->timer < 100; |
| 2037 |
ccs_query_entry->timer++) { |
| 2038 |
wake_up(&ccs_query_wait); |
| 2039 |
set_current_state(TASK_INTERRUPTIBLE); |
| 2040 |
schedule_timeout(HZ / 10); |
| 2041 |
if (ccs_query_entry->answer) |
| 2042 |
break; |
| 2043 |
} |
| 2044 |
spin_lock(&ccs_query_list_lock); |
| 2045 |
list_del(&ccs_query_entry->list); |
| 2046 |
ccs_query_memory_size -= len + sizeof(*ccs_query_entry); |
| 2047 |
spin_unlock(&ccs_query_list_lock); |
| 2048 |
switch (ccs_query_entry->answer) { |
| 2049 |
case 3: /* Asked to retry by administrator. */ |
| 2050 |
error = CCS_RETRY_REQUEST; |
| 2051 |
r->retry++; |
| 2052 |
break; |
| 2053 |
case 1: |
| 2054 |
/* Granted by administrator. */ |
| 2055 |
error = 0; |
| 2056 |
break; |
| 2057 |
case 0: |
| 2058 |
/* Timed out. */ |
| 2059 |
break; |
| 2060 |
default: |
| 2061 |
/* Rejected by administrator. */ |
| 2062 |
break; |
| 2063 |
} |
| 2064 |
out: |
| 2065 |
if (ccs_query_entry) |
| 2066 |
kfree(ccs_query_entry->query); |
| 2067 |
kfree(ccs_query_entry); |
| 2068 |
kfree(header); |
| 2069 |
return error; |
| 2070 |
} |
| 2071 |
|
| 2072 |
/** |
| 2073 |
* ccs_poll_query - poll() for /proc/ccs/query. |
| 2074 |
* |
| 2075 |
* @file: Pointer to "struct file". |
| 2076 |
* @wait: Pointer to "poll_table". |
| 2077 |
* |
| 2078 |
* Returns POLLIN | POLLRDNORM when ready to read, 0 otherwise. |
| 2079 |
* |
| 2080 |
* Waits for access requests which violated policy in enforcing mode. |
| 2081 |
*/ |
| 2082 |
static int ccs_poll_query(struct file *file, poll_table *wait) |
| 2083 |
{ |
| 2084 |
struct list_head *tmp; |
| 2085 |
bool found = false; |
| 2086 |
u8 i; |
| 2087 |
for (i = 0; i < 2; i++) { |
| 2088 |
spin_lock(&ccs_query_list_lock); |
| 2089 |
list_for_each(tmp, &ccs_query_list) { |
| 2090 |
struct ccs_query_entry *ptr = |
| 2091 |
list_entry(tmp, struct ccs_query_entry, list); |
| 2092 |
if (ptr->answer) |
| 2093 |
continue; |
| 2094 |
found = true; |
| 2095 |
break; |
| 2096 |
} |
| 2097 |
spin_unlock(&ccs_query_list_lock); |
| 2098 |
if (found) |
| 2099 |
return POLLIN | POLLRDNORM; |
| 2100 |
if (i) |
| 2101 |
break; |
| 2102 |
poll_wait(file, &ccs_query_wait, wait); |
| 2103 |
} |
| 2104 |
return 0; |
| 2105 |
} |
| 2106 |
|
| 2107 |
/** |
| 2108 |
* ccs_read_query - Read access requests which violated policy in enforcing mode. |
| 2109 |
* |
| 2110 |
* @head: Pointer to "struct ccs_io_buffer". |
| 2111 |
*/ |
| 2112 |
static void ccs_read_query(struct ccs_io_buffer *head) |
| 2113 |
{ |
| 2114 |
struct list_head *tmp; |
| 2115 |
int pos = 0; |
| 2116 |
int len = 0; |
| 2117 |
char *buf; |
| 2118 |
if (head->read_avail) |
| 2119 |
return; |
| 2120 |
if (head->read_buf) { |
| 2121 |
kfree(head->read_buf); |
| 2122 |
head->read_buf = NULL; |
| 2123 |
head->readbuf_size = 0; |
| 2124 |
} |
| 2125 |
spin_lock(&ccs_query_list_lock); |
| 2126 |
list_for_each(tmp, &ccs_query_list) { |
| 2127 |
struct ccs_query_entry *ptr |
| 2128 |
= list_entry(tmp, struct ccs_query_entry, list); |
| 2129 |
if (ptr->answer) |
| 2130 |
continue; |
| 2131 |
if (pos++ != head->read_step) |
| 2132 |
continue; |
| 2133 |
len = ptr->query_len; |
| 2134 |
break; |
| 2135 |
} |
| 2136 |
spin_unlock(&ccs_query_list_lock); |
| 2137 |
if (!len) { |
| 2138 |
head->read_step = 0; |
| 2139 |
return; |
| 2140 |
} |
| 2141 |
buf = kzalloc(len, CCS_GFP_FLAGS); |
| 2142 |
if (!buf) |
| 2143 |
return; |
| 2144 |
pos = 0; |
| 2145 |
spin_lock(&ccs_query_list_lock); |
| 2146 |
list_for_each(tmp, &ccs_query_list) { |
| 2147 |
struct ccs_query_entry *ptr |
| 2148 |
= list_entry(tmp, struct ccs_query_entry, list); |
| 2149 |
if (ptr->answer) |
| 2150 |
continue; |
| 2151 |
if (pos++ != head->read_step) |
| 2152 |
continue; |
| 2153 |
/* |
| 2154 |
* Some query can be skipped because ccs_query_list |
| 2155 |
* can change, but I don't care. |
| 2156 |
*/ |
| 2157 |
if (len == ptr->query_len) |
| 2158 |
memmove(buf, ptr->query, len); |
| 2159 |
break; |
| 2160 |
} |
| 2161 |
spin_unlock(&ccs_query_list_lock); |
| 2162 |
if (buf[0]) { |
| 2163 |
head->read_avail = len; |
| 2164 |
head->readbuf_size = head->read_avail; |
| 2165 |
head->read_buf = buf; |
| 2166 |
head->read_step++; |
| 2167 |
} else { |
| 2168 |
kfree(buf); |
| 2169 |
} |
| 2170 |
} |
| 2171 |
|
| 2172 |
/** |
| 2173 |
* ccs_write_answer - Write the supervisor's decision. |
| 2174 |
* |
| 2175 |
* @head: Pointer to "struct ccs_io_buffer". |
| 2176 |
* |
| 2177 |
* Returns 0 on success, -EINVAL otherwise. |
| 2178 |
*/ |
| 2179 |
static int ccs_write_answer(struct ccs_io_buffer *head) |
| 2180 |
{ |
| 2181 |
char *data = head->write_buf; |
| 2182 |
struct list_head *tmp; |
| 2183 |
unsigned int serial; |
| 2184 |
unsigned int answer; |
| 2185 |
spin_lock(&ccs_query_list_lock); |
| 2186 |
list_for_each(tmp, &ccs_query_list) { |
| 2187 |
struct ccs_query_entry *ptr |
| 2188 |
= list_entry(tmp, struct ccs_query_entry, list); |
| 2189 |
ptr->timer = 0; |
| 2190 |
} |
| 2191 |
spin_unlock(&ccs_query_list_lock); |
| 2192 |
if (sscanf(data, "A%u=%u", &serial, &answer) != 2) |
| 2193 |
return -EINVAL; |
| 2194 |
spin_lock(&ccs_query_list_lock); |
| 2195 |
list_for_each(tmp, &ccs_query_list) { |
| 2196 |
struct ccs_query_entry *ptr |
| 2197 |
= list_entry(tmp, struct ccs_query_entry, list); |
| 2198 |
if (ptr->serial != serial) |
| 2199 |
continue; |
| 2200 |
if (!ptr->answer) |
| 2201 |
ptr->answer = answer; |
| 2202 |
break; |
| 2203 |
} |
| 2204 |
spin_unlock(&ccs_query_list_lock); |
| 2205 |
return 0; |
| 2206 |
} |
| 2207 |
|
| 2208 |
/** |
| 2209 |
* ccs_read_version: Get version. |
| 2210 |
* |
| 2211 |
* @head: Pointer to "struct ccs_io_buffer". |
| 2212 |
*/ |
| 2213 |
static void ccs_read_version(struct ccs_io_buffer *head) |
| 2214 |
{ |
| 2215 |
if (head->read_eof) |
| 2216 |
return; |
| 2217 |
ccs_io_printf(head, "1.7.2"); |
| 2218 |
head->read_eof = true; |
| 2219 |
} |
| 2220 |
|
| 2221 |
/** |
| 2222 |
* ccs_read_self_domain - Get the current process's domainname. |
| 2223 |
* |
| 2224 |
* @head: Pointer to "struct ccs_io_buffer". |
| 2225 |
*/ |
| 2226 |
static void ccs_read_self_domain(struct ccs_io_buffer *head) |
| 2227 |
{ |
| 2228 |
if (head->read_eof) |
| 2229 |
return; |
| 2230 |
/* |
| 2231 |
* ccs_current_domain()->domainname != NULL because every process |
| 2232 |
* belongs to a domain and the domain's name cannot be NULL. |
| 2233 |
*/ |
| 2234 |
ccs_io_printf(head, "%s", ccs_current_domain()->domainname->name); |
| 2235 |
head->read_eof = true; |
| 2236 |
} |
| 2237 |
|
| 2238 |
/** |
| 2239 |
* ccs_open_control - open() for /proc/ccs/ interface. |
| 2240 |
* |
| 2241 |
* @type: Type of interface. |
| 2242 |
* @file: Pointer to "struct file". |
| 2243 |
* |
| 2244 |
* Associates policy handler and returns 0 on success, -ENOMEM otherwise. |
| 2245 |
*/ |
| 2246 |
int ccs_open_control(const u8 type, struct file *file) |
| 2247 |
{ |
| 2248 |
struct ccs_io_buffer *head = kzalloc(sizeof(*head), CCS_GFP_FLAGS); |
| 2249 |
if (!head) |
| 2250 |
return -ENOMEM; |
| 2251 |
mutex_init(&head->io_sem); |
| 2252 |
head->type = type; |
| 2253 |
switch (type) { |
| 2254 |
case CCS_DOMAINPOLICY: /* /proc/ccs/domain_policy */ |
| 2255 |
head->write = ccs_write_domain; |
| 2256 |
head->read = ccs_read_domain; |
| 2257 |
break; |
| 2258 |
case CCS_EXCEPTIONPOLICY: /* /proc/ccs/exception_policy */ |
| 2259 |
head->write = ccs_write_exception; |
| 2260 |
head->read = ccs_read_exception; |
| 2261 |
break; |
| 2262 |
#ifdef CONFIG_CCSECURITY_AUDIT |
| 2263 |
case CCS_GRANTLOG: /* /proc/ccs/grant_log */ |
| 2264 |
case CCS_REJECTLOG: /* /proc/ccs/reject_log */ |
| 2265 |
head->poll = ccs_poll_log; |
| 2266 |
head->read = ccs_read_log; |
| 2267 |
break; |
| 2268 |
#endif |
| 2269 |
case CCS_SELFDOMAIN: /* /proc/ccs/self_domain */ |
| 2270 |
head->read = ccs_read_self_domain; |
| 2271 |
break; |
| 2272 |
case CCS_DOMAIN_STATUS: /* /proc/ccs/.domain_status */ |
| 2273 |
head->write = ccs_write_domain_profile; |
| 2274 |
head->read = ccs_read_domain_profile; |
| 2275 |
break; |
| 2276 |
case CCS_EXECUTE_HANDLER: /* /proc/ccs/.execute_handler */ |
| 2277 |
/* Allow execute_handler to read process's status. */ |
| 2278 |
if (!(current->ccs_flags & CCS_TASK_IS_EXECUTE_HANDLER)) { |
| 2279 |
kfree(head); |
| 2280 |
return -EPERM; |
| 2281 |
} |
| 2282 |
/* fall through */ |
| 2283 |
case CCS_PROCESS_STATUS: /* /proc/ccs/.process_status */ |
| 2284 |
head->write = ccs_write_pid; |
| 2285 |
head->read = ccs_read_pid; |
| 2286 |
break; |
| 2287 |
case CCS_VERSION: /* /proc/ccs/version */ |
| 2288 |
head->read = ccs_read_version; |
| 2289 |
head->readbuf_size = 128; |
| 2290 |
break; |
| 2291 |
case CCS_MEMINFO: /* /proc/ccs/meminfo */ |
| 2292 |
head->write = ccs_write_memory_quota; |
| 2293 |
head->read = ccs_read_memory_counter; |
| 2294 |
head->readbuf_size = 512; |
| 2295 |
break; |
| 2296 |
case CCS_PROFILE: /* /proc/ccs/profile */ |
| 2297 |
head->write = ccs_write_profile; |
| 2298 |
head->read = ccs_read_profile; |
| 2299 |
break; |
| 2300 |
case CCS_QUERY: /* /proc/ccs/query */ |
| 2301 |
head->poll = ccs_poll_query; |
| 2302 |
head->write = ccs_write_answer; |
| 2303 |
head->read = ccs_read_query; |
| 2304 |
break; |
| 2305 |
case CCS_MANAGER: /* /proc/ccs/manager */ |
| 2306 |
head->write = ccs_write_manager; |
| 2307 |
head->read = ccs_read_manager; |
| 2308 |
break; |
| 2309 |
} |
| 2310 |
if (!(file->f_mode & FMODE_READ)) { |
| 2311 |
/* |
| 2312 |
* No need to allocate read_buf since it is not opened |
| 2313 |
* for reading. |
| 2314 |
*/ |
| 2315 |
head->read = NULL; |
| 2316 |
head->poll = NULL; |
| 2317 |
} else if (!head->poll) { |
| 2318 |
/* Don't allocate read_buf for poll() access. */ |
| 2319 |
if (!head->readbuf_size) |
| 2320 |
head->readbuf_size = 4096; |
| 2321 |
head->read_buf = kzalloc(head->readbuf_size, CCS_GFP_FLAGS); |
| 2322 |
if (!head->read_buf) { |
| 2323 |
kfree(head); |
| 2324 |
return -ENOMEM; |
| 2325 |
} |
| 2326 |
} |
| 2327 |
if (!(file->f_mode & FMODE_WRITE)) { |
| 2328 |
/* |
| 2329 |
* No need to allocate write_buf since it is not opened |
| 2330 |
* for writing. |
| 2331 |
*/ |
| 2332 |
head->write = NULL; |
| 2333 |
} else if (head->write) { |
| 2334 |
head->writebuf_size = 4096; |
| 2335 |
head->write_buf = kzalloc(head->writebuf_size, CCS_GFP_FLAGS); |
| 2336 |
if (!head->write_buf) { |
| 2337 |
kfree(head->read_buf); |
| 2338 |
kfree(head); |
| 2339 |
return -ENOMEM; |
| 2340 |
} |
| 2341 |
} |
| 2342 |
if (type != CCS_QUERY && |
| 2343 |
type != CCS_GRANTLOG && type != CCS_REJECTLOG) |
| 2344 |
head->reader_idx = ccs_lock(); |
| 2345 |
file->private_data = head; |
| 2346 |
/* |
| 2347 |
* Call the handler now if the file is /proc/ccs/self_domain |
| 2348 |
* so that the user can use "cat < /proc/ccs/self_domain" to |
| 2349 |
* know the current process's domainname. |
| 2350 |
*/ |
| 2351 |
if (type == CCS_SELFDOMAIN) |
| 2352 |
ccs_read_control(file, NULL, 0); |
| 2353 |
/* |
| 2354 |
* If the file is /proc/ccs/query , increment the observer counter. |
| 2355 |
* The obserber counter is used by ccs_supervisor() to see if |
| 2356 |
* there is some process monitoring /proc/ccs/query. |
| 2357 |
*/ |
| 2358 |
else if (type == CCS_QUERY) |
| 2359 |
atomic_inc(&ccs_query_observers); |
| 2360 |
return 0; |
| 2361 |
} |
| 2362 |
|
| 2363 |
/** |
| 2364 |
* ccs_poll_control - poll() for /proc/ccs/ interface. |
| 2365 |
* |
| 2366 |
* @file: Pointer to "struct file". |
| 2367 |
* @wait: Pointer to "poll_table". |
| 2368 |
* |
| 2369 |
* Waits for read readiness. |
| 2370 |
* /proc/ccs/query is handled by /usr/sbin/ccs-queryd and |
| 2371 |
* /proc/ccs/grant_log and /proc/ccs/reject_log are handled by |
| 2372 |
* /usr/sbin/ccs-auditd . |
| 2373 |
*/ |
| 2374 |
int ccs_poll_control(struct file *file, poll_table *wait) |
| 2375 |
{ |
| 2376 |
struct ccs_io_buffer *head = file->private_data; |
| 2377 |
if (!head->poll) |
| 2378 |
return -ENOSYS; |
| 2379 |
return head->poll(file, wait); |
| 2380 |
} |
| 2381 |
|
| 2382 |
/** |
| 2383 |
* ccs_read_control - read() for /proc/ccs/ interface. |
| 2384 |
* |
| 2385 |
* @file: Pointer to "struct file". |
| 2386 |
* @buffer: Poiner to buffer to write to. |
| 2387 |
* @buffer_len: Size of @buffer. |
| 2388 |
* |
| 2389 |
* Returns bytes read on success, negative value otherwise. |
| 2390 |
*/ |
| 2391 |
int ccs_read_control(struct file *file, char __user *buffer, |
| 2392 |
const int buffer_len) |
| 2393 |
{ |
| 2394 |
int len = 0; |
| 2395 |
struct ccs_io_buffer *head = file->private_data; |
| 2396 |
char *cp; |
| 2397 |
int idx; |
| 2398 |
if (!head->read) |
| 2399 |
return -ENOSYS; |
| 2400 |
if (!access_ok(VERIFY_WRITE, buffer, buffer_len)) |
| 2401 |
return -EFAULT; |
| 2402 |
if (mutex_lock_interruptible(&head->io_sem)) |
| 2403 |
return -EINTR; |
| 2404 |
idx = ccs_read_lock(); |
| 2405 |
while (1) { |
| 2406 |
/* Call the policy handler. */ |
| 2407 |
head->read(head); |
| 2408 |
/* Write to buffer. */ |
| 2409 |
len = head->read_avail; |
| 2410 |
if (len || head->poll || head->read_eof) |
| 2411 |
break; |
| 2412 |
len = head->readbuf_size * 2; |
| 2413 |
cp = kzalloc(len, CCS_GFP_FLAGS); |
| 2414 |
if (!cp) { |
| 2415 |
len = -ENOMEM; |
| 2416 |
goto out; |
| 2417 |
} |
| 2418 |
kfree(head->read_buf); |
| 2419 |
head->read_buf = cp; |
| 2420 |
head->readbuf_size = len; |
| 2421 |
} |
| 2422 |
if (len > buffer_len) |
| 2423 |
len = buffer_len; |
| 2424 |
if (!len) |
| 2425 |
goto out; |
| 2426 |
/* head->read_buf changes by some functions. */ |
| 2427 |
cp = head->read_buf; |
| 2428 |
if (copy_to_user(buffer, cp, len)) { |
| 2429 |
len = -EFAULT; |
| 2430 |
goto out; |
| 2431 |
} |
| 2432 |
head->read_avail -= len; |
| 2433 |
memmove(cp, cp + len, head->read_avail); |
| 2434 |
out: |
| 2435 |
ccs_read_unlock(idx); |
| 2436 |
mutex_unlock(&head->io_sem); |
| 2437 |
return len; |
| 2438 |
} |
| 2439 |
|
| 2440 |
/** |
| 2441 |
* ccs_write_control - write() for /proc/ccs/ interface. |
| 2442 |
* |
| 2443 |
* @file: Pointer to "struct file". |
| 2444 |
* @buffer: Pointer to buffer to read from. |
| 2445 |
* @buffer_len: Size of @buffer. |
| 2446 |
* |
| 2447 |
* Returns @buffer_len on success, negative value otherwise. |
| 2448 |
*/ |
| 2449 |
int ccs_write_control(struct file *file, const char __user *buffer, |
| 2450 |
const int buffer_len) |
| 2451 |
{ |
| 2452 |
struct ccs_io_buffer *head = file->private_data; |
| 2453 |
int error = buffer_len; |
| 2454 |
int avail_len = buffer_len; |
| 2455 |
char *cp0 = head->write_buf; |
| 2456 |
int idx; |
| 2457 |
if (!head->write) |
| 2458 |
return -ENOSYS; |
| 2459 |
if (!access_ok(VERIFY_READ, buffer, buffer_len)) |
| 2460 |
return -EFAULT; |
| 2461 |
if (mutex_lock_interruptible(&head->io_sem)) |
| 2462 |
return -EINTR; |
| 2463 |
idx = ccs_read_lock(); |
| 2464 |
/* Don't allow updating policies by non manager programs. */ |
| 2465 |
if (head->write != ccs_write_pid && head->write != ccs_write_domain && |
| 2466 |
!ccs_manager()) { |
| 2467 |
ccs_read_unlock(idx); |
| 2468 |
mutex_unlock(&head->io_sem); |
| 2469 |
return -EPERM; |
| 2470 |
} |
| 2471 |
/* Read a line and dispatch it to the policy handler. */ |
| 2472 |
while (avail_len > 0) { |
| 2473 |
char c; |
| 2474 |
if (head->write_avail >= head->writebuf_size - 1) { |
| 2475 |
const int len = head->writebuf_size * 2; |
| 2476 |
char *cp = kzalloc(len, CCS_GFP_FLAGS); |
| 2477 |
if (!cp) { |
| 2478 |
error = -ENOMEM; |
| 2479 |
break; |
| 2480 |
} |
| 2481 |
memmove(cp, cp0, head->write_avail); |
| 2482 |
kfree(cp0); |
| 2483 |
head->write_buf = cp; |
| 2484 |
cp0 = cp; |
| 2485 |
head->writebuf_size = len; |
| 2486 |
} |
| 2487 |
if (get_user(c, buffer)) { |
| 2488 |
error = -EFAULT; |
| 2489 |
break; |
| 2490 |
} |
| 2491 |
buffer++; |
| 2492 |
avail_len--; |
| 2493 |
cp0[head->write_avail++] = c; |
| 2494 |
if (c != '\n') |
| 2495 |
continue; |
| 2496 |
cp0[head->write_avail - 1] = '\0'; |
| 2497 |
head->write_avail = 0; |
| 2498 |
ccs_normalize_line(cp0); |
| 2499 |
head->write(head); |
| 2500 |
} |
| 2501 |
ccs_read_unlock(idx); |
| 2502 |
mutex_unlock(&head->io_sem); |
| 2503 |
return error; |
| 2504 |
} |
| 2505 |
|
| 2506 |
/** |
| 2507 |
* ccs_close_control - close() for /proc/ccs/ interface. |
| 2508 |
* |
| 2509 |
* @file: Pointer to "struct file". |
| 2510 |
* |
| 2511 |
* Releases memory and returns 0. |
| 2512 |
*/ |
| 2513 |
int ccs_close_control(struct file *file) |
| 2514 |
{ |
| 2515 |
struct ccs_io_buffer *head = file->private_data; |
| 2516 |
const bool is_write = head->write_buf != NULL; |
| 2517 |
const u8 type = head->type; |
| 2518 |
/* |
| 2519 |
* If the file is /proc/ccs/query , decrement the observer counter. |
| 2520 |
*/ |
| 2521 |
if (type == CCS_QUERY) |
| 2522 |
atomic_dec(&ccs_query_observers); |
| 2523 |
if (type != CCS_QUERY && |
| 2524 |
type != CCS_GRANTLOG && type != CCS_REJECTLOG) |
| 2525 |
ccs_unlock(head->reader_idx); |
| 2526 |
/* Release memory used for policy I/O. */ |
| 2527 |
kfree(head->read_buf); |
| 2528 |
head->read_buf = NULL; |
| 2529 |
kfree(head->write_buf); |
| 2530 |
head->write_buf = NULL; |
| 2531 |
kfree(head); |
| 2532 |
head = NULL; |
| 2533 |
file->private_data = NULL; |
| 2534 |
if (is_write) |
| 2535 |
ccs_run_gc(); |
| 2536 |
return 0; |
| 2537 |
} |
| 2538 |
|
| 2539 |
void __init ccs_policy_io_init(void) |
| 2540 |
{ |
| 2541 |
ccsecurity_ops.check_profile = ccs_check_profile; |
| 2542 |
} |
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