| 1 |
/* |
| 2 |
* fs/tomoyo_network.c |
| 3 |
* |
| 4 |
* Implementation of the Domain-Based Mandatory Access Control. |
| 5 |
* |
| 6 |
* Copyright (C) 2005-2009 NTT DATA CORPORATION |
| 7 |
* |
| 8 |
* Version: 1.6.8-pre 2009/05/08 |
| 9 |
* |
| 10 |
* This file is applicable to both 2.4.30 and 2.6.11 and later. |
| 11 |
* See README.ccs for ChangeLog. |
| 12 |
* |
| 13 |
*/ |
| 14 |
|
| 15 |
#include <linux/ccs_common.h> |
| 16 |
#include <linux/tomoyo.h> |
| 17 |
#include <linux/tomoyo_socket.h> |
| 18 |
#include <linux/realpath.h> |
| 19 |
#include <linux/net.h> |
| 20 |
#include <linux/inet.h> |
| 21 |
#include <linux/in.h> |
| 22 |
#include <linux/in6.h> |
| 23 |
#include <net/ip.h> |
| 24 |
#include <net/ipv6.h> |
| 25 |
#include <net/udp.h> |
| 26 |
|
| 27 |
/* Index numbers for Network Controls. */ |
| 28 |
enum ccs_network_acl_index { |
| 29 |
NETWORK_ACL_UDP_BIND, |
| 30 |
NETWORK_ACL_UDP_CONNECT, |
| 31 |
NETWORK_ACL_TCP_BIND, |
| 32 |
NETWORK_ACL_TCP_LISTEN, |
| 33 |
NETWORK_ACL_TCP_CONNECT, |
| 34 |
NETWORK_ACL_TCP_ACCEPT, |
| 35 |
NETWORK_ACL_RAW_BIND, |
| 36 |
NETWORK_ACL_RAW_CONNECT |
| 37 |
}; |
| 38 |
|
| 39 |
/** |
| 40 |
* ccs_audit_network_log - Audit network log. |
| 41 |
* |
| 42 |
* @r: Pointer to "struct ccs_request_info". |
| 43 |
* @operation: The name of operation. |
| 44 |
* @address: An IPv4 or IPv6 address. |
| 45 |
* @port: Port number. |
| 46 |
* @is_granted: True if this is a granted log. |
| 47 |
* |
| 48 |
* Returns 0 on success, negative value otherwise. |
| 49 |
*/ |
| 50 |
static int ccs_audit_network_log(struct ccs_request_info *r, |
| 51 |
const char *operation, const char *address, |
| 52 |
const u16 port, const bool is_granted) |
| 53 |
{ |
| 54 |
return ccs_write_audit_log(is_granted, r, KEYWORD_ALLOW_NETWORK |
| 55 |
"%s %s %u\n", operation, address, port); |
| 56 |
} |
| 57 |
|
| 58 |
/* The list for "struct ccs_address_group_entry". */ |
| 59 |
LIST_HEAD(ccs_address_group_list); |
| 60 |
|
| 61 |
/** |
| 62 |
* ccs_get_address_group - Allocate memory for "struct ccs_address_group_entry". |
| 63 |
* |
| 64 |
* @group_name: The name of address group. |
| 65 |
* |
| 66 |
* Returns pointer to "struct ccs_address_group_entry" on success, |
| 67 |
* NULL otherwise. |
| 68 |
*/ |
| 69 |
static struct ccs_address_group_entry *ccs_get_address_group(const char * |
| 70 |
group_name) |
| 71 |
{ |
| 72 |
struct ccs_address_group_entry *entry = NULL; |
| 73 |
struct ccs_address_group_entry *group; |
| 74 |
const struct ccs_path_info *saved_group_name; |
| 75 |
int error = -ENOMEM; |
| 76 |
if (!ccs_is_correct_path(group_name, 0, 0, 0, __func__) || |
| 77 |
!group_name[0]) |
| 78 |
return NULL; |
| 79 |
saved_group_name = ccs_get_name(group_name); |
| 80 |
if (!saved_group_name) |
| 81 |
return NULL; |
| 82 |
entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
| 83 |
/***** WRITER SECTION START *****/ |
| 84 |
down_write(&ccs_policy_lock); |
| 85 |
list_for_each_entry(group, &ccs_address_group_list, list) { |
| 86 |
if (saved_group_name != group->group_name) |
| 87 |
continue; |
| 88 |
atomic_inc(&group->users); |
| 89 |
error = 0; |
| 90 |
break; |
| 91 |
} |
| 92 |
if (error && ccs_memory_ok(entry)) { |
| 93 |
INIT_LIST_HEAD(&entry->address_group_member_list); |
| 94 |
entry->group_name = saved_group_name; |
| 95 |
saved_group_name = NULL; |
| 96 |
atomic_set(&entry->users, 1); |
| 97 |
list_add_tail(&entry->list, &ccs_address_group_list); |
| 98 |
group = entry; |
| 99 |
entry = NULL; |
| 100 |
error = 0; |
| 101 |
} |
| 102 |
up_write(&ccs_policy_lock); |
| 103 |
/***** WRITER SECTION END *****/ |
| 104 |
ccs_put_name(saved_group_name); |
| 105 |
kfree(entry); |
| 106 |
return !error ? group : NULL; |
| 107 |
} |
| 108 |
|
| 109 |
/** |
| 110 |
* ccs_update_address_group_entry - Update "struct ccs_address_group_entry" list. |
| 111 |
* |
| 112 |
* @group_name: The name of address group. |
| 113 |
* @is_ipv6: True if @min_address and @max_address are IPv6 addresses. |
| 114 |
* @min_address: Start of IPv4 or IPv6 address range. |
| 115 |
* @max_address: End of IPv4 or IPv6 address range. |
| 116 |
* @is_delete: True if it is a delete request. |
| 117 |
* |
| 118 |
* Returns 0 on success, negative value otherwise. |
| 119 |
*/ |
| 120 |
static int ccs_update_address_group_entry(const char *group_name, |
| 121 |
const bool is_ipv6, |
| 122 |
const u16 *min_address, |
| 123 |
const u16 *max_address, |
| 124 |
const bool is_delete) |
| 125 |
{ |
| 126 |
struct ccs_address_group_entry *group; |
| 127 |
struct ccs_address_group_member *entry = NULL; |
| 128 |
struct ccs_address_group_member *member; |
| 129 |
const struct in6_addr *saved_min_address = NULL; |
| 130 |
const struct in6_addr *saved_max_address = NULL; |
| 131 |
int error = is_delete ? -ENOENT : -ENOMEM; |
| 132 |
const u32 min_ipv4_address = ntohl(*(u32 *) min_address); |
| 133 |
const u32 max_ipv4_address = ntohl(*(u32 *) max_address); |
| 134 |
group = ccs_get_address_group(group_name); |
| 135 |
if (!group) |
| 136 |
return -ENOMEM; |
| 137 |
if (is_ipv6) { |
| 138 |
saved_min_address |
| 139 |
= ccs_get_ipv6_address((struct in6_addr *) |
| 140 |
min_address); |
| 141 |
saved_max_address |
| 142 |
= ccs_get_ipv6_address((struct in6_addr *) |
| 143 |
max_address); |
| 144 |
if (!saved_min_address || !saved_max_address) |
| 145 |
goto out; |
| 146 |
} |
| 147 |
if (!is_delete) |
| 148 |
entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
| 149 |
/***** WRITER SECTION START *****/ |
| 150 |
down_write(&ccs_policy_lock); |
| 151 |
list_for_each_entry(member, &group->address_group_member_list, list) { |
| 152 |
if (member->is_ipv6 != is_ipv6) |
| 153 |
continue; |
| 154 |
if (is_ipv6) { |
| 155 |
if (member->min.ipv6 != saved_min_address || |
| 156 |
member->max.ipv6 != saved_max_address) |
| 157 |
continue; |
| 158 |
} else { |
| 159 |
if (member->min.ipv4 != min_ipv4_address || |
| 160 |
member->max.ipv4 != max_ipv4_address) |
| 161 |
continue; |
| 162 |
} |
| 163 |
member->is_deleted = is_delete; |
| 164 |
error = 0; |
| 165 |
break; |
| 166 |
} |
| 167 |
if (!is_delete && error && ccs_memory_ok(entry)) { |
| 168 |
entry->is_ipv6 = is_ipv6; |
| 169 |
if (is_ipv6) { |
| 170 |
entry->min.ipv6 = saved_min_address; |
| 171 |
saved_min_address = NULL; |
| 172 |
entry->max.ipv6 = saved_max_address; |
| 173 |
saved_max_address = NULL; |
| 174 |
} else { |
| 175 |
entry->min.ipv4 = min_ipv4_address; |
| 176 |
entry->max.ipv4 = max_ipv4_address; |
| 177 |
} |
| 178 |
list_add_tail(&entry->list, &group->address_group_member_list); |
| 179 |
entry = NULL; |
| 180 |
error = 0; |
| 181 |
} |
| 182 |
up_write(&ccs_policy_lock); |
| 183 |
/***** WRITER SECTION END *****/ |
| 184 |
out: |
| 185 |
ccs_put_ipv6_address(saved_min_address); |
| 186 |
ccs_put_ipv6_address(saved_max_address); |
| 187 |
ccs_put_address_group(group); |
| 188 |
ccs_update_counter(CCS_UPDATES_COUNTER_EXCEPTION_POLICY); |
| 189 |
return error; |
| 190 |
} |
| 191 |
|
| 192 |
/** |
| 193 |
* ccs_parse_ip_address - Parse an IP address. |
| 194 |
* |
| 195 |
* @address: String to parse. |
| 196 |
* @min: Pointer to store min address. |
| 197 |
* @max: Pointer to store max address. |
| 198 |
* |
| 199 |
* Returns 2 if @address is an IPv6, 1 if @address is an IPv4, 0 otherwise. |
| 200 |
*/ |
| 201 |
static int ccs_parse_ip_address(char *address, u16 *min, u16 *max) |
| 202 |
{ |
| 203 |
int count = sscanf(address, "%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx" |
| 204 |
"-%hx:%hx:%hx:%hx:%hx:%hx:%hx:%hx", |
| 205 |
&min[0], &min[1], &min[2], &min[3], |
| 206 |
&min[4], &min[5], &min[6], &min[7], |
| 207 |
&max[0], &max[1], &max[2], &max[3], |
| 208 |
&max[4], &max[5], &max[6], &max[7]); |
| 209 |
if (count == 8 || count == 16) { |
| 210 |
u8 i; |
| 211 |
if (count == 8) |
| 212 |
memmove(max, min, sizeof(u16) * 8); |
| 213 |
for (i = 0; i < 8; i++) { |
| 214 |
min[i] = htons(min[i]); |
| 215 |
max[i] = htons(max[i]); |
| 216 |
} |
| 217 |
return 2; |
| 218 |
} |
| 219 |
count = sscanf(address, "%hu.%hu.%hu.%hu-%hu.%hu.%hu.%hu", |
| 220 |
&min[0], &min[1], &min[2], &min[3], |
| 221 |
&max[0], &max[1], &max[2], &max[3]); |
| 222 |
if (count == 4 || count == 8) { |
| 223 |
u32 ip = htonl((((u8) min[0]) << 24) + (((u8) min[1]) << 16) |
| 224 |
+ (((u8) min[2]) << 8) + (u8) min[3]); |
| 225 |
memmove(min, &ip, sizeof(ip)); |
| 226 |
if (count == 8) |
| 227 |
ip = htonl((((u8) max[0]) << 24) + (((u8) max[1]) << 16) |
| 228 |
+ (((u8) max[2]) << 8) + (u8) max[3]); |
| 229 |
memmove(max, &ip, sizeof(ip)); |
| 230 |
return 1; |
| 231 |
} |
| 232 |
return 0; |
| 233 |
} |
| 234 |
|
| 235 |
/** |
| 236 |
* ccs_write_address_group_policy - Write "struct ccs_address_group_entry" list. |
| 237 |
* |
| 238 |
* @data: String to parse. |
| 239 |
* @is_delete: True if it is a delete request. |
| 240 |
* |
| 241 |
* Returns 0 on success, negative value otherwise. |
| 242 |
*/ |
| 243 |
int ccs_write_address_group_policy(char *data, const bool is_delete) |
| 244 |
{ |
| 245 |
bool is_ipv6; |
| 246 |
u16 min_address[8]; |
| 247 |
u16 max_address[8]; |
| 248 |
char *cp = strchr(data, ' '); |
| 249 |
if (!cp) |
| 250 |
return -EINVAL; |
| 251 |
*cp++ = '\0'; |
| 252 |
switch (ccs_parse_ip_address(cp, min_address, max_address)) { |
| 253 |
case 2: |
| 254 |
is_ipv6 = true; |
| 255 |
break; |
| 256 |
case 1: |
| 257 |
is_ipv6 = false; |
| 258 |
break; |
| 259 |
default: |
| 260 |
return -EINVAL; |
| 261 |
} |
| 262 |
return ccs_update_address_group_entry(data, is_ipv6, min_address, |
| 263 |
max_address, is_delete); |
| 264 |
} |
| 265 |
|
| 266 |
/** |
| 267 |
* ccs_address_matches_group - Check whether the given address matches members of the given address group. |
| 268 |
* |
| 269 |
* @is_ipv6: True if @address is an IPv6 address. |
| 270 |
* @address: An IPv4 or IPv6 address. |
| 271 |
* @group: Pointer to "struct ccs_address_group_entry". |
| 272 |
* |
| 273 |
* Returns true if @address matches addresses in @group group, false otherwise. |
| 274 |
* |
| 275 |
* Caller holds ccs_policy_lockfor reading. |
| 276 |
*/ |
| 277 |
static bool ccs_address_matches_group(const bool is_ipv6, const u32 *address, |
| 278 |
const struct ccs_address_group_entry * |
| 279 |
group) |
| 280 |
{ |
| 281 |
struct ccs_address_group_member *member; |
| 282 |
const u32 ip = ntohl(*address); |
| 283 |
bool matched = false; |
| 284 |
list_for_each_entry(member, &group->address_group_member_list, list) { |
| 285 |
if (member->is_deleted) |
| 286 |
continue; |
| 287 |
if (member->is_ipv6) { |
| 288 |
if (is_ipv6 && |
| 289 |
memcmp(member->min.ipv6, address, 16) <= 0 && |
| 290 |
memcmp(address, member->max.ipv6, 16) <= 0) { |
| 291 |
matched = true; |
| 292 |
break; |
| 293 |
} |
| 294 |
} else { |
| 295 |
if (!is_ipv6 && |
| 296 |
member->min.ipv4 <= ip && ip <= member->max.ipv4) { |
| 297 |
matched = true; |
| 298 |
break; |
| 299 |
} |
| 300 |
} |
| 301 |
} |
| 302 |
return matched; |
| 303 |
} |
| 304 |
|
| 305 |
/** |
| 306 |
* ccs_read_address_group_policy - Read "struct ccs_address_group_entry" list. |
| 307 |
* |
| 308 |
* @head: Pointer to "struct ccs_io_buffer". |
| 309 |
* |
| 310 |
* Returns true on success, false otherwise. |
| 311 |
*/ |
| 312 |
bool ccs_read_address_group_policy(struct ccs_io_buffer *head) |
| 313 |
{ |
| 314 |
struct list_head *gpos; |
| 315 |
struct list_head *mpos; |
| 316 |
bool done = true; |
| 317 |
/***** READER SECTION START *****/ |
| 318 |
down_read(&ccs_policy_lock); |
| 319 |
list_for_each_cookie(gpos, head->read_var1.u.list, |
| 320 |
&ccs_address_group_list) { |
| 321 |
struct ccs_address_group_entry *group; |
| 322 |
group = list_entry(gpos, struct ccs_address_group_entry, list); |
| 323 |
list_for_each_cookie(mpos, head->read_var2.u.list, |
| 324 |
&group->address_group_member_list) { |
| 325 |
char buf[128]; |
| 326 |
struct ccs_address_group_member *member; |
| 327 |
member = list_entry(mpos, |
| 328 |
struct ccs_address_group_member, |
| 329 |
list); |
| 330 |
if (member->is_deleted) |
| 331 |
continue; |
| 332 |
if (member->is_ipv6) { |
| 333 |
const struct in6_addr *min_address |
| 334 |
= member->min.ipv6; |
| 335 |
const struct in6_addr *max_address |
| 336 |
= member->max.ipv6; |
| 337 |
ccs_print_ipv6(buf, sizeof(buf), min_address); |
| 338 |
if (min_address != max_address) { |
| 339 |
int len; |
| 340 |
char *cp = buf + strlen(buf); |
| 341 |
*cp++ = '-'; |
| 342 |
len = strlen(buf); |
| 343 |
ccs_print_ipv6(cp, sizeof(buf) - len, |
| 344 |
max_address); |
| 345 |
} |
| 346 |
} else { |
| 347 |
const u32 min_address = member->min.ipv4; |
| 348 |
const u32 max_address = member->max.ipv4; |
| 349 |
memset(buf, 0, sizeof(buf)); |
| 350 |
snprintf(buf, sizeof(buf) - 1, "%u.%u.%u.%u", |
| 351 |
HIPQUAD(min_address)); |
| 352 |
if (min_address != max_address) { |
| 353 |
const int len = strlen(buf); |
| 354 |
snprintf(buf + len, |
| 355 |
sizeof(buf) - 1 - len, |
| 356 |
"-%u.%u.%u.%u", |
| 357 |
HIPQUAD(max_address)); |
| 358 |
} |
| 359 |
} |
| 360 |
done = ccs_io_printf(head, KEYWORD_ADDRESS_GROUP |
| 361 |
"%s %s\n", group->group_name->name, |
| 362 |
buf); |
| 363 |
if (!done) |
| 364 |
break; |
| 365 |
} |
| 366 |
if (!done) |
| 367 |
break; |
| 368 |
} |
| 369 |
up_read(&ccs_policy_lock); |
| 370 |
/***** READER SECTION END *****/ |
| 371 |
return done; |
| 372 |
} |
| 373 |
|
| 374 |
#if !defined(NIP6) |
| 375 |
#define NIP6(addr) \ |
| 376 |
ntohs((addr).s6_addr16[0]), ntohs((addr).s6_addr16[1]), \ |
| 377 |
ntohs((addr).s6_addr16[2]), ntohs((addr).s6_addr16[3]), \ |
| 378 |
ntohs((addr).s6_addr16[4]), ntohs((addr).s6_addr16[5]), \ |
| 379 |
ntohs((addr).s6_addr16[6]), ntohs((addr).s6_addr16[7]) |
| 380 |
#endif |
| 381 |
|
| 382 |
/** |
| 383 |
* ccs_print_ipv6 - Print an IPv6 address. |
| 384 |
* |
| 385 |
* @buffer: Buffer to write to. |
| 386 |
* @buffer_len: Size of @buffer. |
| 387 |
* @ip: Pointer to "struct in6_addr". |
| 388 |
* |
| 389 |
* Returns nothing. |
| 390 |
*/ |
| 391 |
void ccs_print_ipv6(char *buffer, const int buffer_len, |
| 392 |
const struct in6_addr *ip) |
| 393 |
{ |
| 394 |
memset(buffer, 0, buffer_len); |
| 395 |
snprintf(buffer, buffer_len - 1, "%x:%x:%x:%x:%x:%x:%x:%x", NIP6(*ip)); |
| 396 |
} |
| 397 |
|
| 398 |
/** |
| 399 |
* ccs_net2keyword - Convert network operation index to network operation name. |
| 400 |
* |
| 401 |
* @operation: Type of operation. |
| 402 |
* |
| 403 |
* Returns the name of operation. |
| 404 |
*/ |
| 405 |
const char *ccs_net2keyword(const u8 operation) |
| 406 |
{ |
| 407 |
const char *keyword = "unknown"; |
| 408 |
switch (operation) { |
| 409 |
case NETWORK_ACL_UDP_BIND: |
| 410 |
keyword = "UDP bind"; |
| 411 |
break; |
| 412 |
case NETWORK_ACL_UDP_CONNECT: |
| 413 |
keyword = "UDP connect"; |
| 414 |
break; |
| 415 |
case NETWORK_ACL_TCP_BIND: |
| 416 |
keyword = "TCP bind"; |
| 417 |
break; |
| 418 |
case NETWORK_ACL_TCP_LISTEN: |
| 419 |
keyword = "TCP listen"; |
| 420 |
break; |
| 421 |
case NETWORK_ACL_TCP_CONNECT: |
| 422 |
keyword = "TCP connect"; |
| 423 |
break; |
| 424 |
case NETWORK_ACL_TCP_ACCEPT: |
| 425 |
keyword = "TCP accept"; |
| 426 |
break; |
| 427 |
case NETWORK_ACL_RAW_BIND: |
| 428 |
keyword = "RAW bind"; |
| 429 |
break; |
| 430 |
case NETWORK_ACL_RAW_CONNECT: |
| 431 |
keyword = "RAW connect"; |
| 432 |
break; |
| 433 |
} |
| 434 |
return keyword; |
| 435 |
} |
| 436 |
|
| 437 |
/** |
| 438 |
* ccs_update_network_entry - Update "struct ccs_ip_network_acl_record" list. |
| 439 |
* |
| 440 |
* @operation: Type of operation. |
| 441 |
* @record_type: Type of address. |
| 442 |
* @group: Name of group. May be NULL. |
| 443 |
* @min_address: Start of IPv4 or IPv6 address range. |
| 444 |
* @max_address: End of IPv4 or IPv6 address range. |
| 445 |
* @min_port: Start of port number range. |
| 446 |
* @max_port: End of port number range. |
| 447 |
* @domain: Pointer to "struct ccs_domain_info". |
| 448 |
* @condition: Pointer to "struct ccs_condition_list". May be NULL. |
| 449 |
* @is_delete: True if it is a delete request. |
| 450 |
* |
| 451 |
* Returns 0 on success, negative value otherwise. |
| 452 |
*/ |
| 453 |
static int ccs_update_network_entry(const u8 operation, const u8 record_type, |
| 454 |
const char *group_name, |
| 455 |
const u32 *min_address, |
| 456 |
const u32 *max_address, |
| 457 |
const u16 min_port, const u16 max_port, |
| 458 |
struct ccs_domain_info *domain, |
| 459 |
struct ccs_condition_list *condition, |
| 460 |
const bool is_delete) |
| 461 |
{ |
| 462 |
struct ccs_ip_network_acl_record *entry = NULL; |
| 463 |
struct ccs_acl_info *ptr; |
| 464 |
int error = is_delete ? -ENOENT : -ENOMEM; |
| 465 |
/* using host byte order to allow u32 comparison than memcmp().*/ |
| 466 |
const u32 min_ip = ntohl(*min_address); |
| 467 |
const u32 max_ip = ntohl(*max_address); |
| 468 |
const struct in6_addr *saved_min_address = NULL; |
| 469 |
const struct in6_addr *saved_max_address = NULL; |
| 470 |
struct ccs_address_group_entry *group = NULL; |
| 471 |
if (!domain) |
| 472 |
return -EINVAL; |
| 473 |
if (group_name) { |
| 474 |
group = ccs_get_address_group(group_name); |
| 475 |
if (!group) |
| 476 |
return -ENOMEM; |
| 477 |
} else if (record_type == IP_RECORD_TYPE_IPv6) { |
| 478 |
saved_min_address = ccs_get_ipv6_address((struct in6_addr *) |
| 479 |
min_address); |
| 480 |
saved_max_address = ccs_get_ipv6_address((struct in6_addr *) |
| 481 |
max_address); |
| 482 |
if (!saved_min_address || !saved_max_address) |
| 483 |
goto out; |
| 484 |
} |
| 485 |
if (is_delete) |
| 486 |
goto delete; |
| 487 |
entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
| 488 |
/***** WRITER SECTION START *****/ |
| 489 |
down_write(&ccs_policy_lock); |
| 490 |
list_for_each_entry(ptr, &domain->acl_info_list, list) { |
| 491 |
struct ccs_ip_network_acl_record *acl; |
| 492 |
if (ccs_acl_type1(ptr) != TYPE_IP_NETWORK_ACL) |
| 493 |
continue; |
| 494 |
if (ptr->cond != condition) |
| 495 |
continue; |
| 496 |
acl = container_of(ptr, struct ccs_ip_network_acl_record, head); |
| 497 |
if (acl->operation_type != operation || |
| 498 |
acl->record_type != record_type || |
| 499 |
acl->min_port != min_port || max_port != acl->max_port) |
| 500 |
continue; |
| 501 |
if (record_type == IP_RECORD_TYPE_ADDRESS_GROUP) { |
| 502 |
if (acl->u.group != group) |
| 503 |
continue; |
| 504 |
} else if (record_type == IP_RECORD_TYPE_IPv4) { |
| 505 |
if (acl->u.ipv4.min != min_ip || |
| 506 |
max_ip != acl->u.ipv4.max) |
| 507 |
continue; |
| 508 |
} else if (record_type == IP_RECORD_TYPE_IPv6) { |
| 509 |
if (acl->u.ipv6.min != saved_min_address || |
| 510 |
saved_max_address != acl->u.ipv6.max) |
| 511 |
continue; |
| 512 |
} |
| 513 |
error = ccs_add_domain_acl(NULL, ptr); |
| 514 |
break; |
| 515 |
} |
| 516 |
if (error && ccs_memory_ok(entry)) { |
| 517 |
entry->head.type = TYPE_IP_NETWORK_ACL; |
| 518 |
entry->head.cond = condition; |
| 519 |
entry->operation_type = operation; |
| 520 |
entry->record_type = record_type; |
| 521 |
if (record_type == IP_RECORD_TYPE_ADDRESS_GROUP) { |
| 522 |
entry->u.group = group; |
| 523 |
group = NULL; |
| 524 |
} else if (record_type == IP_RECORD_TYPE_IPv4) { |
| 525 |
entry->u.ipv4.min = min_ip; |
| 526 |
entry->u.ipv4.max = max_ip; |
| 527 |
} else { |
| 528 |
entry->u.ipv6.min = saved_min_address; |
| 529 |
saved_min_address = NULL; |
| 530 |
entry->u.ipv6.max = saved_max_address; |
| 531 |
saved_max_address = NULL; |
| 532 |
} |
| 533 |
entry->min_port = min_port; |
| 534 |
entry->max_port = max_port; |
| 535 |
error = ccs_add_domain_acl(domain, &entry->head); |
| 536 |
entry = NULL; |
| 537 |
} |
| 538 |
up_write(&ccs_policy_lock); |
| 539 |
/***** WRITER SECTION END *****/ |
| 540 |
goto out; |
| 541 |
delete: |
| 542 |
/***** WRITER SECTION START *****/ |
| 543 |
down_write(&ccs_policy_lock); |
| 544 |
list_for_each_entry(ptr, &domain->acl_info_list, list) { |
| 545 |
struct ccs_ip_network_acl_record *acl; |
| 546 |
if (ccs_acl_type2(ptr) != TYPE_IP_NETWORK_ACL) |
| 547 |
continue; |
| 548 |
if (ptr->cond != condition) |
| 549 |
continue; |
| 550 |
acl = container_of(ptr, struct ccs_ip_network_acl_record, head); |
| 551 |
if (acl->operation_type != operation || |
| 552 |
acl->record_type != record_type || |
| 553 |
acl->min_port != min_port || max_port != acl->max_port) |
| 554 |
continue; |
| 555 |
if (record_type == IP_RECORD_TYPE_ADDRESS_GROUP) { |
| 556 |
if (acl->u.group != group) |
| 557 |
continue; |
| 558 |
} else if (record_type == IP_RECORD_TYPE_IPv4) { |
| 559 |
if (acl->u.ipv4.min != min_ip || |
| 560 |
max_ip != acl->u.ipv4.max) |
| 561 |
continue; |
| 562 |
} else if (record_type == IP_RECORD_TYPE_IPv6) { |
| 563 |
if (acl->u.ipv6.min != saved_min_address || |
| 564 |
saved_max_address != acl->u.ipv6.max) |
| 565 |
continue; |
| 566 |
} |
| 567 |
error = ccs_del_domain_acl(ptr); |
| 568 |
break; |
| 569 |
} |
| 570 |
up_write(&ccs_policy_lock); |
| 571 |
/***** WRITER SECTION END *****/ |
| 572 |
out: |
| 573 |
ccs_put_ipv6_address(saved_min_address); |
| 574 |
ccs_put_ipv6_address(saved_max_address); |
| 575 |
ccs_put_address_group(group); |
| 576 |
kfree(entry); |
| 577 |
return error; |
| 578 |
} |
| 579 |
|
| 580 |
/** |
| 581 |
* ccs_check_network_entry - Check permission for network operation. |
| 582 |
* |
| 583 |
* @is_ipv6: True if @address is an IPv6 address. |
| 584 |
* @operation: Type of operation. |
| 585 |
* @address: An IPv4 or IPv6 address. |
| 586 |
* @port: Port number. |
| 587 |
* |
| 588 |
* Returns 0 on success, negative value otherwise. |
| 589 |
*/ |
| 590 |
static int ccs_check_network_entry(const bool is_ipv6, const u8 operation, |
| 591 |
const u32 *address, const u16 port) |
| 592 |
{ |
| 593 |
struct ccs_request_info r; |
| 594 |
struct ccs_acl_info *ptr; |
| 595 |
const char *keyword = ccs_net2keyword(operation); |
| 596 |
bool is_enforce; |
| 597 |
/* using host byte order to allow u32 comparison than memcmp().*/ |
| 598 |
const u32 ip = ntohl(*address); |
| 599 |
bool found = false; |
| 600 |
int error = -EPERM; |
| 601 |
char buf[64]; |
| 602 |
if (!ccs_can_sleep()) |
| 603 |
return 0; |
| 604 |
ccs_init_request_info(&r, NULL, CCS_MAC_FOR_NETWORK); |
| 605 |
is_enforce = (r.mode == 3); |
| 606 |
if (!r.mode) { |
| 607 |
error = 0; |
| 608 |
goto done; |
| 609 |
} |
| 610 |
retry: |
| 611 |
/***** READER SECTION START *****/ |
| 612 |
down_read(&ccs_policy_lock); |
| 613 |
list_for_each_entry(ptr, &r.cookie.u.domain->acl_info_list, list) { |
| 614 |
struct ccs_ip_network_acl_record *acl; |
| 615 |
if (ccs_acl_type2(ptr) != TYPE_IP_NETWORK_ACL) |
| 616 |
continue; |
| 617 |
acl = container_of(ptr, struct ccs_ip_network_acl_record, head); |
| 618 |
if (acl->operation_type != operation || port < acl->min_port || |
| 619 |
acl->max_port < port || !ccs_check_condition(&r, ptr)) |
| 620 |
continue; |
| 621 |
if (acl->record_type == IP_RECORD_TYPE_ADDRESS_GROUP) { |
| 622 |
if (!ccs_address_matches_group(is_ipv6, address, |
| 623 |
acl->u.group)) |
| 624 |
continue; |
| 625 |
} else if (acl->record_type == IP_RECORD_TYPE_IPv4) { |
| 626 |
if (is_ipv6 || |
| 627 |
ip < acl->u.ipv4.min || acl->u.ipv4.max < ip) |
| 628 |
continue; |
| 629 |
} else { |
| 630 |
if (!is_ipv6 || |
| 631 |
memcmp(acl->u.ipv6.min, address, 16) > 0 || |
| 632 |
memcmp(address, acl->u.ipv6.max, 16) > 0) |
| 633 |
continue; |
| 634 |
} |
| 635 |
r.condition_cookie.u.cond = ptr->cond; |
| 636 |
found = true; |
| 637 |
break; |
| 638 |
} |
| 639 |
up_read(&ccs_policy_lock); |
| 640 |
/***** READER SECTION END *****/ |
| 641 |
memset(buf, 0, sizeof(buf)); |
| 642 |
if (is_ipv6) |
| 643 |
ccs_print_ipv6(buf, sizeof(buf), |
| 644 |
(const struct in6_addr *) address); |
| 645 |
else |
| 646 |
snprintf(buf, sizeof(buf) - 1, "%u.%u.%u.%u", HIPQUAD(ip)); |
| 647 |
ccs_audit_network_log(&r, keyword, buf, port, found); |
| 648 |
if (found) { |
| 649 |
error = 0; |
| 650 |
goto done; |
| 651 |
} |
| 652 |
if (ccs_verbose_mode(r.cookie.u.domain)) |
| 653 |
printk(KERN_WARNING "TOMOYO-%s: %s to %s %u denied for %s\n", |
| 654 |
ccs_get_msg(is_enforce), keyword, buf, port, |
| 655 |
ccs_get_last_name(r.cookie.u.domain)); |
| 656 |
if (is_enforce) { |
| 657 |
int err = ccs_check_supervisor(&r, KEYWORD_ALLOW_NETWORK |
| 658 |
"%s %s %u\n", keyword, buf, |
| 659 |
port); |
| 660 |
if (err == 1) |
| 661 |
goto retry; |
| 662 |
error = err; |
| 663 |
goto done; |
| 664 |
} |
| 665 |
if (r.mode == 1 && ccs_domain_quota_ok(r.cookie.u.domain)) |
| 666 |
ccs_update_network_entry(operation, is_ipv6 ? |
| 667 |
IP_RECORD_TYPE_IPv6 : |
| 668 |
IP_RECORD_TYPE_IPv4, |
| 669 |
NULL, address, address, port, port, |
| 670 |
r.cookie.u.domain, ccs_handler_cond(), |
| 671 |
false); |
| 672 |
error = 0; |
| 673 |
done: |
| 674 |
ccs_exit_request_info(&r); |
| 675 |
return error; |
| 676 |
} |
| 677 |
|
| 678 |
/** |
| 679 |
* ccs_write_network_policy - Write "struct ccs_ip_network_acl_record" list. |
| 680 |
* |
| 681 |
* @data: String to parse. |
| 682 |
* @domain: Pointer to "struct ccs_domain_info". |
| 683 |
* @condition: Pointer to "struct ccs_condition_list". May be NULL. |
| 684 |
* @is_delete: True if it is a delete request. |
| 685 |
* |
| 686 |
* Returns 0 on success, negative value otherwise. |
| 687 |
*/ |
| 688 |
int ccs_write_network_policy(char *data, struct ccs_domain_info *domain, |
| 689 |
struct ccs_condition_list *condition, |
| 690 |
const bool is_delete) |
| 691 |
{ |
| 692 |
u8 sock_type; |
| 693 |
u8 operation; |
| 694 |
u8 record_type; |
| 695 |
u16 min_address[8]; |
| 696 |
u16 max_address[8]; |
| 697 |
const char *group_name = NULL; |
| 698 |
u16 min_port; |
| 699 |
u16 max_port; |
| 700 |
u8 count; |
| 701 |
char *cp1 = strchr(data, ' '); |
| 702 |
char *cp2; |
| 703 |
if (!cp1) |
| 704 |
goto out; |
| 705 |
cp1++; |
| 706 |
if (!strncmp(data, "TCP ", 4)) |
| 707 |
sock_type = SOCK_STREAM; |
| 708 |
else if (!strncmp(data, "UDP ", 4)) |
| 709 |
sock_type = SOCK_DGRAM; |
| 710 |
else if (!strncmp(data, "RAW ", 4)) |
| 711 |
sock_type = SOCK_RAW; |
| 712 |
else |
| 713 |
goto out; |
| 714 |
cp2 = strchr(cp1, ' '); |
| 715 |
if (!cp2) |
| 716 |
goto out; |
| 717 |
cp2++; |
| 718 |
if (!strncmp(cp1, "bind ", 5)) |
| 719 |
switch (sock_type) { |
| 720 |
case SOCK_STREAM: |
| 721 |
operation = NETWORK_ACL_TCP_BIND; |
| 722 |
break; |
| 723 |
case SOCK_DGRAM: |
| 724 |
operation = NETWORK_ACL_UDP_BIND; |
| 725 |
break; |
| 726 |
default: |
| 727 |
operation = NETWORK_ACL_RAW_BIND; |
| 728 |
} |
| 729 |
else if (!strncmp(cp1, "connect ", 8)) |
| 730 |
switch (sock_type) { |
| 731 |
case SOCK_STREAM: |
| 732 |
operation = NETWORK_ACL_TCP_CONNECT; |
| 733 |
break; |
| 734 |
case SOCK_DGRAM: |
| 735 |
operation = NETWORK_ACL_UDP_CONNECT; |
| 736 |
break; |
| 737 |
default: |
| 738 |
operation = NETWORK_ACL_RAW_CONNECT; |
| 739 |
} |
| 740 |
else if (sock_type == SOCK_STREAM && !strncmp(cp1, "listen ", 7)) |
| 741 |
operation = NETWORK_ACL_TCP_LISTEN; |
| 742 |
else if (sock_type == SOCK_STREAM && !strncmp(cp1, "accept ", 7)) |
| 743 |
operation = NETWORK_ACL_TCP_ACCEPT; |
| 744 |
else |
| 745 |
goto out; |
| 746 |
cp1 = strchr(cp2, ' '); |
| 747 |
if (!cp1) |
| 748 |
goto out; |
| 749 |
*cp1++ = '\0'; |
| 750 |
switch (ccs_parse_ip_address(cp2, min_address, max_address)) { |
| 751 |
case 2: |
| 752 |
record_type = IP_RECORD_TYPE_IPv6; |
| 753 |
break; |
| 754 |
case 1: |
| 755 |
record_type = IP_RECORD_TYPE_IPv4; |
| 756 |
break; |
| 757 |
default: |
| 758 |
if (*cp2 != '@') |
| 759 |
goto out; |
| 760 |
group_name = cp2 + 1; |
| 761 |
record_type = IP_RECORD_TYPE_ADDRESS_GROUP; |
| 762 |
break; |
| 763 |
} |
| 764 |
if (strchr(cp1, ' ')) |
| 765 |
goto out; |
| 766 |
count = sscanf(cp1, "%hu-%hu", &min_port, &max_port); |
| 767 |
if (count != 1 && count != 2) |
| 768 |
goto out; |
| 769 |
if (count == 1) |
| 770 |
max_port = min_port; |
| 771 |
return ccs_update_network_entry(operation, record_type, group_name, |
| 772 |
(u32 *) min_address, |
| 773 |
(u32 *) max_address, |
| 774 |
min_port, max_port, domain, condition, |
| 775 |
is_delete); |
| 776 |
out: |
| 777 |
return -EINVAL; |
| 778 |
} |
| 779 |
|
| 780 |
/** |
| 781 |
* ccs_check_network_listen_acl - Check permission for listen() operation. |
| 782 |
* |
| 783 |
* @is_ipv6: True if @address is an IPv6 address. |
| 784 |
* @address: An IPv4 or IPv6 address. |
| 785 |
* @port: Port number. |
| 786 |
* |
| 787 |
* Returns 0 on success, negative value otherwise. |
| 788 |
*/ |
| 789 |
static inline int ccs_check_network_listen_acl(const bool is_ipv6, |
| 790 |
const u8 *address, |
| 791 |
const u16 port) |
| 792 |
{ |
| 793 |
return ccs_check_network_entry(is_ipv6, NETWORK_ACL_TCP_LISTEN, |
| 794 |
(const u32 *) address, ntohs(port)); |
| 795 |
} |
| 796 |
|
| 797 |
/** |
| 798 |
* ccs_check_network_connect_acl - Check permission for connect() operation. |
| 799 |
* |
| 800 |
* @is_ipv6: True if @address is an IPv6 address. |
| 801 |
* @sock_type: Type of socket. (TCP or UDP or RAW) |
| 802 |
* @address: An IPv4 or IPv6 address. |
| 803 |
* @port: Port number. |
| 804 |
* |
| 805 |
* Returns 0 on success, negative value otherwise. |
| 806 |
*/ |
| 807 |
static inline int ccs_check_network_connect_acl(const bool is_ipv6, |
| 808 |
const int sock_type, |
| 809 |
const u8 *address, |
| 810 |
const u16 port) |
| 811 |
{ |
| 812 |
u8 operation; |
| 813 |
switch (sock_type) { |
| 814 |
case SOCK_STREAM: |
| 815 |
operation = NETWORK_ACL_TCP_CONNECT; |
| 816 |
break; |
| 817 |
case SOCK_DGRAM: |
| 818 |
operation = NETWORK_ACL_UDP_CONNECT; |
| 819 |
break; |
| 820 |
default: |
| 821 |
operation = NETWORK_ACL_RAW_CONNECT; |
| 822 |
} |
| 823 |
return ccs_check_network_entry(is_ipv6, operation, |
| 824 |
(const u32 *) address, ntohs(port)); |
| 825 |
} |
| 826 |
|
| 827 |
/** |
| 828 |
* ccs_check_network_bind_acl - Check permission for bind() operation. |
| 829 |
* |
| 830 |
* @is_ipv6: True if @address is an IPv6 address. |
| 831 |
* @sock_type: Type of socket. (TCP or UDP or RAW) |
| 832 |
* @address: An IPv4 or IPv6 address. |
| 833 |
* @port: Port number. |
| 834 |
* |
| 835 |
* Returns 0 on success, negative value otherwise. |
| 836 |
*/ |
| 837 |
static int ccs_check_network_bind_acl(const bool is_ipv6, const int sock_type, |
| 838 |
const u8 *address, const u16 port) |
| 839 |
{ |
| 840 |
u8 operation; |
| 841 |
switch (sock_type) { |
| 842 |
case SOCK_STREAM: |
| 843 |
operation = NETWORK_ACL_TCP_BIND; |
| 844 |
break; |
| 845 |
case SOCK_DGRAM: |
| 846 |
operation = NETWORK_ACL_UDP_BIND; |
| 847 |
break; |
| 848 |
default: |
| 849 |
operation = NETWORK_ACL_RAW_BIND; |
| 850 |
} |
| 851 |
return ccs_check_network_entry(is_ipv6, operation, |
| 852 |
(const u32 *) address, ntohs(port)); |
| 853 |
} |
| 854 |
|
| 855 |
/** |
| 856 |
* ccs_check_network_accept_acl - Check permission for accept() operation. |
| 857 |
* |
| 858 |
* @is_ipv6: True if @address is an IPv6 address. |
| 859 |
* @address: An IPv4 or IPv6 address. |
| 860 |
* @port: Port number. |
| 861 |
* |
| 862 |
* Returns 0 on success, negative value otherwise. |
| 863 |
*/ |
| 864 |
static inline int ccs_check_network_accept_acl(const bool is_ipv6, |
| 865 |
const u8 *address, |
| 866 |
const u16 port) |
| 867 |
{ |
| 868 |
int retval; |
| 869 |
current->ccs_flags |= CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
| 870 |
retval = ccs_check_network_entry(is_ipv6, NETWORK_ACL_TCP_ACCEPT, |
| 871 |
(const u32 *) address, ntohs(port)); |
| 872 |
current->ccs_flags &= ~CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
| 873 |
return retval; |
| 874 |
} |
| 875 |
|
| 876 |
/** |
| 877 |
* ccs_check_network_sendmsg_acl - Check permission for sendmsg() operation. |
| 878 |
* |
| 879 |
* @is_ipv6: True if @address is an IPv6 address. |
| 880 |
* @sock_type: Type of socket. (UDP or RAW) |
| 881 |
* @address: An IPv4 or IPv6 address. |
| 882 |
* @port: Port number. |
| 883 |
* |
| 884 |
* Returns 0 on success, negative value otherwise. |
| 885 |
*/ |
| 886 |
static inline int ccs_check_network_sendmsg_acl(const bool is_ipv6, |
| 887 |
const int sock_type, |
| 888 |
const u8 *address, |
| 889 |
const u16 port) |
| 890 |
{ |
| 891 |
u8 operation; |
| 892 |
if (sock_type == SOCK_DGRAM) |
| 893 |
operation = NETWORK_ACL_UDP_CONNECT; |
| 894 |
else |
| 895 |
operation = NETWORK_ACL_RAW_CONNECT; |
| 896 |
return ccs_check_network_entry(is_ipv6, operation, |
| 897 |
(const u32 *) address, ntohs(port)); |
| 898 |
} |
| 899 |
|
| 900 |
/** |
| 901 |
* ccs_check_network_recvmsg_acl - Check permission for recvmsg() operation. |
| 902 |
* |
| 903 |
* @is_ipv6: True if @address is an IPv6 address. |
| 904 |
* @sock_type: Type of socket. (UDP or RAW) |
| 905 |
* @address: An IPv4 or IPv6 address. |
| 906 |
* @port: Port number. |
| 907 |
* |
| 908 |
* Returns 0 on success, negative value otherwise. |
| 909 |
*/ |
| 910 |
static inline int ccs_check_network_recvmsg_acl(const bool is_ipv6, |
| 911 |
const int sock_type, |
| 912 |
const u8 *address, |
| 913 |
const u16 port) |
| 914 |
{ |
| 915 |
int retval; |
| 916 |
const u8 operation |
| 917 |
= (sock_type == SOCK_DGRAM) ? |
| 918 |
NETWORK_ACL_UDP_CONNECT : NETWORK_ACL_RAW_CONNECT; |
| 919 |
current->ccs_flags |= CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
| 920 |
retval = ccs_check_network_entry(is_ipv6, operation, |
| 921 |
(const u32 *) address, ntohs(port)); |
| 922 |
current->ccs_flags &= ~CCS_DONT_SLEEP_ON_ENFORCE_ERROR; |
| 923 |
return retval; |
| 924 |
} |
| 925 |
|
| 926 |
#define MAX_SOCK_ADDR 128 /* net/socket.c */ |
| 927 |
|
| 928 |
/* Check permission for creating a socket. */ |
| 929 |
int ccs_socket_create_permission(int family, int type, int protocol) |
| 930 |
{ |
| 931 |
int error = 0; |
| 932 |
/* Nothing to do if I am a kernel service. */ |
| 933 |
if (segment_eq(get_fs(), KERNEL_DS)) |
| 934 |
return 0; |
| 935 |
if (family == PF_PACKET && !ccs_capable(CCS_USE_PACKET_SOCKET)) |
| 936 |
return -EPERM; |
| 937 |
if (family == PF_ROUTE && !ccs_capable(CCS_USE_ROUTE_SOCKET)) |
| 938 |
return -EPERM; |
| 939 |
if (family != PF_INET && family != PF_INET6) |
| 940 |
return 0; |
| 941 |
switch (type) { |
| 942 |
case SOCK_STREAM: |
| 943 |
if (!ccs_capable(CCS_INET_STREAM_SOCKET_CREATE)) |
| 944 |
error = -EPERM; |
| 945 |
break; |
| 946 |
case SOCK_DGRAM: |
| 947 |
if (!ccs_capable(CCS_USE_INET_DGRAM_SOCKET)) |
| 948 |
error = -EPERM; |
| 949 |
break; |
| 950 |
case SOCK_RAW: |
| 951 |
if (!ccs_capable(CCS_USE_INET_RAW_SOCKET)) |
| 952 |
error = -EPERM; |
| 953 |
break; |
| 954 |
} |
| 955 |
return error; |
| 956 |
} |
| 957 |
|
| 958 |
/* Check permission for listening a TCP socket. */ |
| 959 |
int ccs_socket_listen_permission(struct socket *sock) |
| 960 |
{ |
| 961 |
int error = 0; |
| 962 |
char addr[MAX_SOCK_ADDR]; |
| 963 |
int addr_len; |
| 964 |
/* Nothing to do if I am a kernel service. */ |
| 965 |
if (segment_eq(get_fs(), KERNEL_DS)) |
| 966 |
return 0; |
| 967 |
if (sock->type != SOCK_STREAM) |
| 968 |
return 0; |
| 969 |
switch (sock->sk->sk_family) { |
| 970 |
case PF_INET: |
| 971 |
case PF_INET6: |
| 972 |
break; |
| 973 |
default: |
| 974 |
return 0; |
| 975 |
} |
| 976 |
if (!ccs_capable(CCS_INET_STREAM_SOCKET_LISTEN)) |
| 977 |
return -EPERM; |
| 978 |
if (sock->ops->getname(sock, (struct sockaddr *) addr, &addr_len, 0)) |
| 979 |
return -EPERM; |
| 980 |
switch (((struct sockaddr *) addr)->sa_family) { |
| 981 |
struct sockaddr_in6 *addr6; |
| 982 |
struct sockaddr_in *addr4; |
| 983 |
case AF_INET6: |
| 984 |
addr6 = (struct sockaddr_in6 *) addr; |
| 985 |
error = ccs_check_network_listen_acl(true, |
| 986 |
addr6->sin6_addr.s6_addr, |
| 987 |
addr6->sin6_port); |
| 988 |
break; |
| 989 |
case AF_INET: |
| 990 |
addr4 = (struct sockaddr_in *) addr; |
| 991 |
error = ccs_check_network_listen_acl(false, |
| 992 |
(u8 *) &addr4->sin_addr, |
| 993 |
addr4->sin_port); |
| 994 |
break; |
| 995 |
} |
| 996 |
return error; |
| 997 |
} |
| 998 |
|
| 999 |
/* Check permission for setting the remote IP address/port pair of a socket. */ |
| 1000 |
int ccs_socket_connect_permission(struct socket *sock, struct sockaddr *addr, |
| 1001 |
int addr_len) |
| 1002 |
{ |
| 1003 |
int error = 0; |
| 1004 |
const unsigned int type = sock->type; |
| 1005 |
/* Nothing to do if I am a kernel service. */ |
| 1006 |
if (segment_eq(get_fs(), KERNEL_DS)) |
| 1007 |
return 0; |
| 1008 |
switch (type) { |
| 1009 |
case SOCK_STREAM: |
| 1010 |
case SOCK_DGRAM: |
| 1011 |
case SOCK_RAW: |
| 1012 |
break; |
| 1013 |
default: |
| 1014 |
return 0; |
| 1015 |
} |
| 1016 |
switch (addr->sa_family) { |
| 1017 |
struct sockaddr_in6 *addr6; |
| 1018 |
struct sockaddr_in *addr4; |
| 1019 |
u16 port; |
| 1020 |
case AF_INET6: |
| 1021 |
if (addr_len < SIN6_LEN_RFC2133) |
| 1022 |
break; |
| 1023 |
addr6 = (struct sockaddr_in6 *) addr; |
| 1024 |
if (type != SOCK_RAW) |
| 1025 |
port = addr6->sin6_port; |
| 1026 |
else |
| 1027 |
port = htons(sock->sk->sk_protocol); |
| 1028 |
error = ccs_check_network_connect_acl(true, type, |
| 1029 |
addr6->sin6_addr.s6_addr, |
| 1030 |
port); |
| 1031 |
break; |
| 1032 |
case AF_INET: |
| 1033 |
if (addr_len < sizeof(struct sockaddr_in)) |
| 1034 |
break; |
| 1035 |
addr4 = (struct sockaddr_in *) addr; |
| 1036 |
if (type != SOCK_RAW) |
| 1037 |
port = addr4->sin_port; |
| 1038 |
else |
| 1039 |
port = htons(sock->sk->sk_protocol); |
| 1040 |
error = ccs_check_network_connect_acl(false, type, |
| 1041 |
(u8 *) &addr4->sin_addr, |
| 1042 |
port); |
| 1043 |
break; |
| 1044 |
} |
| 1045 |
if (type != SOCK_STREAM) |
| 1046 |
return error; |
| 1047 |
switch (sock->sk->sk_family) { |
| 1048 |
case PF_INET: |
| 1049 |
case PF_INET6: |
| 1050 |
if (!ccs_capable(CCS_INET_STREAM_SOCKET_CONNECT)) |
| 1051 |
error = -EPERM; |
| 1052 |
break; |
| 1053 |
} |
| 1054 |
return error; |
| 1055 |
} |
| 1056 |
|
| 1057 |
/* Check permission for setting the local IP address/port pair of a socket. */ |
| 1058 |
int ccs_socket_bind_permission(struct socket *sock, struct sockaddr *addr, |
| 1059 |
int addr_len) |
| 1060 |
{ |
| 1061 |
int error = 0; |
| 1062 |
const unsigned int type = sock->type; |
| 1063 |
/* Nothing to do if I am a kernel service. */ |
| 1064 |
if (segment_eq(get_fs(), KERNEL_DS)) |
| 1065 |
return 0; |
| 1066 |
switch (type) { |
| 1067 |
case SOCK_STREAM: |
| 1068 |
case SOCK_DGRAM: |
| 1069 |
case SOCK_RAW: |
| 1070 |
break; |
| 1071 |
default: |
| 1072 |
return 0; |
| 1073 |
} |
| 1074 |
switch (addr->sa_family) { |
| 1075 |
struct sockaddr_in6 *addr6; |
| 1076 |
struct sockaddr_in *addr4; |
| 1077 |
u16 port; |
| 1078 |
case AF_INET6: |
| 1079 |
if (addr_len < SIN6_LEN_RFC2133) |
| 1080 |
break; |
| 1081 |
addr6 = (struct sockaddr_in6 *) addr; |
| 1082 |
if (type != SOCK_RAW) |
| 1083 |
port = addr6->sin6_port; |
| 1084 |
else |
| 1085 |
port = htons(sock->sk->sk_protocol); |
| 1086 |
error = ccs_check_network_bind_acl(true, type, |
| 1087 |
addr6->sin6_addr.s6_addr, |
| 1088 |
port); |
| 1089 |
break; |
| 1090 |
case AF_INET: |
| 1091 |
if (addr_len < sizeof(struct sockaddr_in)) |
| 1092 |
break; |
| 1093 |
addr4 = (struct sockaddr_in *) addr; |
| 1094 |
if (type != SOCK_RAW) |
| 1095 |
port = addr4->sin_port; |
| 1096 |
else |
| 1097 |
port = htons(sock->sk->sk_protocol); |
| 1098 |
error = ccs_check_network_bind_acl(false, type, |
| 1099 |
(u8 *) &addr4->sin_addr, |
| 1100 |
port); |
| 1101 |
break; |
| 1102 |
} |
| 1103 |
return error; |
| 1104 |
} |
| 1105 |
|
| 1106 |
/* |
| 1107 |
* Check permission for accepting a TCP socket. |
| 1108 |
* |
| 1109 |
* Currently, the LSM hook for this purpose is not provided. |
| 1110 |
*/ |
| 1111 |
int ccs_socket_accept_permission(struct socket *sock, struct sockaddr *addr) |
| 1112 |
{ |
| 1113 |
int error = 0; |
| 1114 |
int addr_len; |
| 1115 |
/* Nothing to do if I am a kernel service. */ |
| 1116 |
if (segment_eq(get_fs(), KERNEL_DS)) |
| 1117 |
return 0; |
| 1118 |
switch (sock->sk->sk_family) { |
| 1119 |
case PF_INET: |
| 1120 |
case PF_INET6: |
| 1121 |
break; |
| 1122 |
default: |
| 1123 |
return 0; |
| 1124 |
} |
| 1125 |
error = sock->ops->getname(sock, addr, &addr_len, 2); |
| 1126 |
if (error) |
| 1127 |
return error; |
| 1128 |
switch (addr->sa_family) { |
| 1129 |
struct sockaddr_in6 *addr6; |
| 1130 |
struct sockaddr_in *addr4; |
| 1131 |
case AF_INET6: |
| 1132 |
addr6 = (struct sockaddr_in6 *) addr; |
| 1133 |
error = ccs_check_network_accept_acl(true, |
| 1134 |
addr6->sin6_addr.s6_addr, |
| 1135 |
addr6->sin6_port); |
| 1136 |
break; |
| 1137 |
case AF_INET: |
| 1138 |
addr4 = (struct sockaddr_in *) addr; |
| 1139 |
error = ccs_check_network_accept_acl(false, |
| 1140 |
(u8 *) &addr4->sin_addr, |
| 1141 |
addr4->sin_port); |
| 1142 |
break; |
| 1143 |
} |
| 1144 |
return error; |
| 1145 |
} |
| 1146 |
|
| 1147 |
/* Check permission for sending a datagram via a UDP or RAW socket. */ |
| 1148 |
int ccs_socket_sendmsg_permission(struct socket *sock, struct sockaddr *addr, |
| 1149 |
int addr_len) |
| 1150 |
{ |
| 1151 |
int error = 0; |
| 1152 |
const int type = sock->type; |
| 1153 |
/* Nothing to do if I am a kernel service. */ |
| 1154 |
if (segment_eq(get_fs(), KERNEL_DS)) |
| 1155 |
return 0; |
| 1156 |
if (!addr || (type != SOCK_DGRAM && type != SOCK_RAW)) |
| 1157 |
return 0; |
| 1158 |
switch (addr->sa_family) { |
| 1159 |
struct sockaddr_in6 *addr6; |
| 1160 |
struct sockaddr_in *addr4; |
| 1161 |
u16 port; |
| 1162 |
case AF_INET6: |
| 1163 |
if (addr_len < SIN6_LEN_RFC2133) |
| 1164 |
break; |
| 1165 |
addr6 = (struct sockaddr_in6 *) addr; |
| 1166 |
if (type == SOCK_DGRAM) |
| 1167 |
port = addr6->sin6_port; |
| 1168 |
else |
| 1169 |
port = htons(sock->sk->sk_protocol); |
| 1170 |
error = ccs_check_network_sendmsg_acl(true, type, |
| 1171 |
addr6->sin6_addr.s6_addr, |
| 1172 |
port); |
| 1173 |
break; |
| 1174 |
case AF_INET: |
| 1175 |
if (addr_len < sizeof(struct sockaddr_in)) |
| 1176 |
break; |
| 1177 |
addr4 = (struct sockaddr_in *) addr; |
| 1178 |
if (type == SOCK_DGRAM) |
| 1179 |
port = addr4->sin_port; |
| 1180 |
else |
| 1181 |
port = htons(sock->sk->sk_protocol); |
| 1182 |
error = ccs_check_network_sendmsg_acl(false, type, |
| 1183 |
(u8 *) &addr4->sin_addr, |
| 1184 |
port); |
| 1185 |
break; |
| 1186 |
} |
| 1187 |
return error; |
| 1188 |
} |
| 1189 |
|
| 1190 |
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 22) |
| 1191 |
#if !defined(RHEL_MAJOR) || RHEL_MAJOR != 5 |
| 1192 |
|
| 1193 |
static inline struct iphdr *ip_hdr(const struct sk_buff *skb) |
| 1194 |
{ |
| 1195 |
return skb->nh.iph; |
| 1196 |
} |
| 1197 |
|
| 1198 |
static inline struct udphdr *udp_hdr(const struct sk_buff *skb) |
| 1199 |
{ |
| 1200 |
return skb->h.uh; |
| 1201 |
} |
| 1202 |
|
| 1203 |
static inline struct ipv6hdr *ipv6_hdr(const struct sk_buff *skb) |
| 1204 |
{ |
| 1205 |
return skb->nh.ipv6h; |
| 1206 |
} |
| 1207 |
|
| 1208 |
#endif |
| 1209 |
#endif |
| 1210 |
|
| 1211 |
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 12) |
| 1212 |
static void skb_kill_datagram(struct sock *sk, struct sk_buff *skb, |
| 1213 |
unsigned int flags) |
| 1214 |
{ |
| 1215 |
/* Clear queue. */ |
| 1216 |
if (flags & MSG_PEEK) { |
| 1217 |
int clear = 0; |
| 1218 |
spin_lock_irq(&sk->sk_receive_queue.lock); |
| 1219 |
if (skb == skb_peek(&sk->sk_receive_queue)) { |
| 1220 |
__skb_unlink(skb, &sk->sk_receive_queue); |
| 1221 |
clear = 1; |
| 1222 |
} |
| 1223 |
spin_unlock_irq(&sk->sk_receive_queue.lock); |
| 1224 |
if (clear) |
| 1225 |
kfree_skb(skb); |
| 1226 |
} |
| 1227 |
skb_free_datagram(sk, skb); |
| 1228 |
} |
| 1229 |
#elif LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 16) |
| 1230 |
static void skb_kill_datagram(struct sock *sk, struct sk_buff *skb, |
| 1231 |
unsigned int flags) |
| 1232 |
{ |
| 1233 |
/* Clear queue. */ |
| 1234 |
if (flags & MSG_PEEK) { |
| 1235 |
int clear = 0; |
| 1236 |
spin_lock_bh(&sk->sk_receive_queue.lock); |
| 1237 |
if (skb == skb_peek(&sk->sk_receive_queue)) { |
| 1238 |
__skb_unlink(skb, &sk->sk_receive_queue); |
| 1239 |
clear = 1; |
| 1240 |
} |
| 1241 |
spin_unlock_bh(&sk->sk_receive_queue.lock); |
| 1242 |
if (clear) |
| 1243 |
kfree_skb(skb); |
| 1244 |
} |
| 1245 |
skb_free_datagram(sk, skb); |
| 1246 |
} |
| 1247 |
#endif |
| 1248 |
|
| 1249 |
/* |
| 1250 |
* Check permission for receiving a datagram via a UDP or RAW socket. |
| 1251 |
* |
| 1252 |
* Currently, the LSM hook for this purpose is not provided. |
| 1253 |
*/ |
| 1254 |
int ccs_socket_recvmsg_permission(struct sock *sk, struct sk_buff *skb, |
| 1255 |
const unsigned int flags) |
| 1256 |
{ |
| 1257 |
int error = 0; |
| 1258 |
const unsigned int type = sk->sk_type; |
| 1259 |
if (type != SOCK_DGRAM && type != SOCK_RAW) |
| 1260 |
return 0; |
| 1261 |
/* Nothing to do if I am a kernel service. */ |
| 1262 |
if (segment_eq(get_fs(), KERNEL_DS)) |
| 1263 |
return 0; |
| 1264 |
|
| 1265 |
switch (sk->sk_family) { |
| 1266 |
struct in6_addr sin6; |
| 1267 |
struct in_addr sin4; |
| 1268 |
u16 port; |
| 1269 |
case PF_INET6: |
| 1270 |
if (type == SOCK_DGRAM) { /* UDP IPv6 */ |
| 1271 |
if (skb->protocol == htons(ETH_P_IP)) { |
| 1272 |
ipv6_addr_set(&sin6, 0, 0, htonl(0xffff), |
| 1273 |
ip_hdr(skb)->saddr); |
| 1274 |
} else { |
| 1275 |
ipv6_addr_copy(&sin6, &ipv6_hdr(skb)->saddr); |
| 1276 |
} |
| 1277 |
port = udp_hdr(skb)->source; |
| 1278 |
} else { /* RAW IPv6 */ |
| 1279 |
ipv6_addr_copy(&sin6, &ipv6_hdr(skb)->saddr); |
| 1280 |
port = htons(sk->sk_protocol); |
| 1281 |
} |
| 1282 |
error = ccs_check_network_recvmsg_acl(true, type, |
| 1283 |
(u8 *) &sin6, port); |
| 1284 |
break; |
| 1285 |
case PF_INET: |
| 1286 |
if (type == SOCK_DGRAM) { /* UDP IPv4 */ |
| 1287 |
sin4.s_addr = ip_hdr(skb)->saddr; |
| 1288 |
port = udp_hdr(skb)->source; |
| 1289 |
} else { /* RAW IPv4 */ |
| 1290 |
sin4.s_addr = ip_hdr(skb)->saddr; |
| 1291 |
port = htons(sk->sk_protocol); |
| 1292 |
} |
| 1293 |
error = ccs_check_network_recvmsg_acl(false, type, |
| 1294 |
(u8 *) &sin4, port); |
| 1295 |
break; |
| 1296 |
} |
| 1297 |
if (!error) |
| 1298 |
return 0; |
| 1299 |
/* |
| 1300 |
* Remove from queue if MSG_PEEK is used so that |
| 1301 |
* the head message from unwanted source in receive queue will not |
| 1302 |
* prevent the caller from picking up next message from wanted source |
| 1303 |
* when the caller is using MSG_PEEK flag for picking up. |
| 1304 |
*/ |
| 1305 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
| 1306 |
if (type == SOCK_DGRAM) |
| 1307 |
lock_sock(sk); |
| 1308 |
#endif |
| 1309 |
skb_kill_datagram(sk, skb, flags); |
| 1310 |
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 25) |
| 1311 |
if (type == SOCK_DGRAM) |
| 1312 |
release_sock(sk); |
| 1313 |
#endif |
| 1314 |
/* Hope less harmful than -EPERM. */ |
| 1315 |
return -ENOMEM; |
| 1316 |
} |
| 1317 |
EXPORT_SYMBOL(ccs_socket_recvmsg_permission); |
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