Paul Moore | 5778eab | 2007-02-28 15:14:22 -0500 | [diff] [blame] | 1 | /* |
| 2 | * SELinux NetLabel Support |
| 3 | * |
| 4 | * This file provides the necessary glue to tie NetLabel into the SELinux |
| 5 | * subsystem. |
| 6 | * |
| 7 | * Author: Paul Moore <paul.moore@hp.com> |
| 8 | * |
| 9 | */ |
| 10 | |
| 11 | /* |
Paul Moore | 948bf85 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 12 | * (c) Copyright Hewlett-Packard Development Company, L.P., 2007, 2008 |
Paul Moore | 5778eab | 2007-02-28 15:14:22 -0500 | [diff] [blame] | 13 | * |
| 14 | * This program is free software; you can redistribute it and/or modify |
| 15 | * it under the terms of the GNU General Public License as published by |
| 16 | * the Free Software Foundation; either version 2 of the License, or |
| 17 | * (at your option) any later version. |
| 18 | * |
| 19 | * This program is distributed in the hope that it will be useful, |
| 20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
| 22 | * the GNU General Public License for more details. |
| 23 | * |
| 24 | * You should have received a copy of the GNU General Public License |
| 25 | * along with this program; if not, write to the Free Software |
| 26 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 27 | * |
| 28 | */ |
| 29 | |
| 30 | #include <linux/spinlock.h> |
| 31 | #include <linux/rcupdate.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 32 | #include <linux/gfp.h> |
Paul Moore | 014ab19 | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 33 | #include <linux/ip.h> |
| 34 | #include <linux/ipv6.h> |
Paul Moore | 5778eab | 2007-02-28 15:14:22 -0500 | [diff] [blame] | 35 | #include <net/sock.h> |
| 36 | #include <net/netlabel.h> |
Paul Moore | 014ab19 | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 37 | #include <net/ip.h> |
| 38 | #include <net/ipv6.h> |
Paul Moore | 5778eab | 2007-02-28 15:14:22 -0500 | [diff] [blame] | 39 | |
| 40 | #include "objsec.h" |
| 41 | #include "security.h" |
Adrian Bunk | d4ee423 | 2008-02-27 23:20:42 +0200 | [diff] [blame] | 42 | #include "netlabel.h" |
Paul Moore | 5778eab | 2007-02-28 15:14:22 -0500 | [diff] [blame] | 43 | |
| 44 | /** |
Paul Moore | 5dbe1eb | 2008-01-29 08:44:18 -0500 | [diff] [blame] | 45 | * selinux_netlbl_sidlookup_cached - Cache a SID lookup |
| 46 | * @skb: the packet |
| 47 | * @secattr: the NetLabel security attributes |
| 48 | * @sid: the SID |
| 49 | * |
| 50 | * Description: |
| 51 | * Query the SELinux security server to lookup the correct SID for the given |
| 52 | * security attributes. If the query is successful, cache the result to speed |
| 53 | * up future lookups. Returns zero on success, negative values on failure. |
| 54 | * |
| 55 | */ |
| 56 | static int selinux_netlbl_sidlookup_cached(struct sk_buff *skb, |
| 57 | struct netlbl_lsm_secattr *secattr, |
| 58 | u32 *sid) |
| 59 | { |
| 60 | int rc; |
| 61 | |
| 62 | rc = security_netlbl_secattr_to_sid(secattr, sid); |
| 63 | if (rc == 0 && |
| 64 | (secattr->flags & NETLBL_SECATTR_CACHEABLE) && |
| 65 | (secattr->flags & NETLBL_SECATTR_CACHE)) |
| 66 | netlbl_cache_add(skb, secattr); |
| 67 | |
| 68 | return rc; |
| 69 | } |
| 70 | |
| 71 | /** |
Paul Moore | 6c5b3fc | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 72 | * selinux_netlbl_sock_genattr - Generate the NetLabel socket secattr |
| 73 | * @sk: the socket |
| 74 | * |
| 75 | * Description: |
| 76 | * Generate the NetLabel security attributes for a socket, making full use of |
| 77 | * the socket's attribute cache. Returns a pointer to the security attributes |
| 78 | * on success, NULL on failure. |
| 79 | * |
| 80 | */ |
| 81 | static struct netlbl_lsm_secattr *selinux_netlbl_sock_genattr(struct sock *sk) |
| 82 | { |
| 83 | int rc; |
| 84 | struct sk_security_struct *sksec = sk->sk_security; |
| 85 | struct netlbl_lsm_secattr *secattr; |
| 86 | |
| 87 | if (sksec->nlbl_secattr != NULL) |
| 88 | return sksec->nlbl_secattr; |
| 89 | |
| 90 | secattr = netlbl_secattr_alloc(GFP_ATOMIC); |
| 91 | if (secattr == NULL) |
| 92 | return NULL; |
| 93 | rc = security_netlbl_sid_to_secattr(sksec->sid, secattr); |
| 94 | if (rc != 0) { |
| 95 | netlbl_secattr_free(secattr); |
| 96 | return NULL; |
| 97 | } |
| 98 | sksec->nlbl_secattr = secattr; |
| 99 | |
| 100 | return secattr; |
| 101 | } |
| 102 | |
| 103 | /** |
Paul Moore | 5778eab | 2007-02-28 15:14:22 -0500 | [diff] [blame] | 104 | * selinux_netlbl_cache_invalidate - Invalidate the NetLabel cache |
| 105 | * |
| 106 | * Description: |
| 107 | * Invalidate the NetLabel security attribute mapping cache. |
| 108 | * |
| 109 | */ |
| 110 | void selinux_netlbl_cache_invalidate(void) |
| 111 | { |
| 112 | netlbl_cache_invalidate(); |
| 113 | } |
| 114 | |
| 115 | /** |
Paul Moore | dfaebe9 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 116 | * selinux_netlbl_err - Handle a NetLabel packet error |
| 117 | * @skb: the packet |
| 118 | * @error: the error code |
| 119 | * @gateway: true if host is acting as a gateway, false otherwise |
| 120 | * |
| 121 | * Description: |
| 122 | * When a packet is dropped due to a call to avc_has_perm() pass the error |
| 123 | * code to the NetLabel subsystem so any protocol specific processing can be |
| 124 | * done. This is safe to call even if you are unsure if NetLabel labeling is |
| 125 | * present on the packet, NetLabel is smart enough to only act when it should. |
| 126 | * |
| 127 | */ |
| 128 | void selinux_netlbl_err(struct sk_buff *skb, int error, int gateway) |
| 129 | { |
| 130 | netlbl_skbuff_err(skb, error, gateway); |
| 131 | } |
| 132 | |
| 133 | /** |
Paul Moore | 6c5b3fc | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 134 | * selinux_netlbl_sk_security_free - Free the NetLabel fields |
Eric Paris | dd3e783 | 2010-04-07 15:08:46 -0400 | [diff] [blame] | 135 | * @sksec: the sk_security_struct |
Paul Moore | 6c5b3fc | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 136 | * |
| 137 | * Description: |
| 138 | * Free all of the memory in the NetLabel fields of a sk_security_struct. |
| 139 | * |
| 140 | */ |
Eric Paris | dd3e783 | 2010-04-07 15:08:46 -0400 | [diff] [blame] | 141 | void selinux_netlbl_sk_security_free(struct sk_security_struct *sksec) |
Paul Moore | 6c5b3fc | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 142 | { |
Eric Paris | dd3e783 | 2010-04-07 15:08:46 -0400 | [diff] [blame] | 143 | if (sksec->nlbl_secattr != NULL) |
| 144 | netlbl_secattr_free(sksec->nlbl_secattr); |
Paul Moore | 6c5b3fc | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 145 | } |
| 146 | |
| 147 | /** |
Paul Moore | 5778eab | 2007-02-28 15:14:22 -0500 | [diff] [blame] | 148 | * selinux_netlbl_sk_security_reset - Reset the NetLabel fields |
Eric Paris | dd3e783 | 2010-04-07 15:08:46 -0400 | [diff] [blame] | 149 | * @sksec: the sk_security_struct |
Paul Moore | 5778eab | 2007-02-28 15:14:22 -0500 | [diff] [blame] | 150 | * @family: the socket family |
| 151 | * |
| 152 | * Description: |
| 153 | * Called when the NetLabel state of a sk_security_struct needs to be reset. |
| 154 | * The caller is responsibile for all the NetLabel sk_security_struct locking. |
| 155 | * |
| 156 | */ |
Eric Paris | dd3e783 | 2010-04-07 15:08:46 -0400 | [diff] [blame] | 157 | void selinux_netlbl_sk_security_reset(struct sk_security_struct *sksec) |
Paul Moore | 5778eab | 2007-02-28 15:14:22 -0500 | [diff] [blame] | 158 | { |
Eric Paris | dd3e783 | 2010-04-07 15:08:46 -0400 | [diff] [blame] | 159 | sksec->nlbl_state = NLBL_UNSET; |
Paul Moore | 5778eab | 2007-02-28 15:14:22 -0500 | [diff] [blame] | 160 | } |
| 161 | |
| 162 | /** |
Paul Moore | 5778eab | 2007-02-28 15:14:22 -0500 | [diff] [blame] | 163 | * selinux_netlbl_skbuff_getsid - Get the sid of a packet using NetLabel |
| 164 | * @skb: the packet |
Paul Moore | 75e2291 | 2008-01-29 08:38:04 -0500 | [diff] [blame] | 165 | * @family: protocol family |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 166 | * @type: NetLabel labeling protocol type |
Paul Moore | 5778eab | 2007-02-28 15:14:22 -0500 | [diff] [blame] | 167 | * @sid: the SID |
| 168 | * |
| 169 | * Description: |
| 170 | * Call the NetLabel mechanism to get the security attributes of the given |
| 171 | * packet and use those attributes to determine the correct context/SID to |
| 172 | * assign to the packet. Returns zero on success, negative values on failure. |
| 173 | * |
| 174 | */ |
Paul Moore | 75e2291 | 2008-01-29 08:38:04 -0500 | [diff] [blame] | 175 | int selinux_netlbl_skbuff_getsid(struct sk_buff *skb, |
| 176 | u16 family, |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 177 | u32 *type, |
Paul Moore | 75e2291 | 2008-01-29 08:38:04 -0500 | [diff] [blame] | 178 | u32 *sid) |
Paul Moore | 5778eab | 2007-02-28 15:14:22 -0500 | [diff] [blame] | 179 | { |
| 180 | int rc; |
| 181 | struct netlbl_lsm_secattr secattr; |
| 182 | |
Paul Moore | 23bcdc1 | 2007-07-18 12:28:45 -0400 | [diff] [blame] | 183 | if (!netlbl_enabled()) { |
| 184 | *sid = SECSID_NULL; |
| 185 | return 0; |
| 186 | } |
| 187 | |
Paul Moore | 5778eab | 2007-02-28 15:14:22 -0500 | [diff] [blame] | 188 | netlbl_secattr_init(&secattr); |
Paul Moore | 75e2291 | 2008-01-29 08:38:04 -0500 | [diff] [blame] | 189 | rc = netlbl_skbuff_getattr(skb, family, &secattr); |
Paul Moore | 5dbe1eb | 2008-01-29 08:44:18 -0500 | [diff] [blame] | 190 | if (rc == 0 && secattr.flags != NETLBL_SECATTR_NONE) |
| 191 | rc = selinux_netlbl_sidlookup_cached(skb, &secattr, sid); |
| 192 | else |
Paul Moore | 5778eab | 2007-02-28 15:14:22 -0500 | [diff] [blame] | 193 | *sid = SECSID_NULL; |
Paul Moore | 220deb9 | 2008-01-29 08:38:23 -0500 | [diff] [blame] | 194 | *type = secattr.type; |
Paul Moore | 5778eab | 2007-02-28 15:14:22 -0500 | [diff] [blame] | 195 | netlbl_secattr_destroy(&secattr); |
| 196 | |
| 197 | return rc; |
| 198 | } |
| 199 | |
| 200 | /** |
Paul Moore | 948bf85 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 201 | * selinux_netlbl_skbuff_setsid - Set the NetLabel on a packet given a sid |
| 202 | * @skb: the packet |
| 203 | * @family: protocol family |
| 204 | * @sid: the SID |
| 205 | * |
| 206 | * Description |
| 207 | * Call the NetLabel mechanism to set the label of a packet using @sid. |
André Goddard Rosa | af901ca | 2009-11-14 13:09:05 -0200 | [diff] [blame] | 208 | * Returns zero on success, negative values on failure. |
Paul Moore | 948bf85 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 209 | * |
| 210 | */ |
| 211 | int selinux_netlbl_skbuff_setsid(struct sk_buff *skb, |
| 212 | u16 family, |
| 213 | u32 sid) |
| 214 | { |
| 215 | int rc; |
Paul Moore | 6c5b3fc | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 216 | struct netlbl_lsm_secattr secattr_storage; |
| 217 | struct netlbl_lsm_secattr *secattr = NULL; |
Paul Moore | 948bf85 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 218 | struct sock *sk; |
| 219 | |
| 220 | /* if this is a locally generated packet check to see if it is already |
| 221 | * being labeled by it's parent socket, if it is just exit */ |
| 222 | sk = skb->sk; |
| 223 | if (sk != NULL) { |
| 224 | struct sk_security_struct *sksec = sk->sk_security; |
| 225 | if (sksec->nlbl_state != NLBL_REQSKB) |
| 226 | return 0; |
Paul Moore | 6c5b3fc | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 227 | secattr = sksec->nlbl_secattr; |
| 228 | } |
| 229 | if (secattr == NULL) { |
| 230 | secattr = &secattr_storage; |
| 231 | netlbl_secattr_init(secattr); |
| 232 | rc = security_netlbl_sid_to_secattr(sid, secattr); |
| 233 | if (rc != 0) |
| 234 | goto skbuff_setsid_return; |
Paul Moore | 948bf85 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 235 | } |
| 236 | |
Paul Moore | 6c5b3fc | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 237 | rc = netlbl_skbuff_setattr(skb, family, secattr); |
Paul Moore | 948bf85 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 238 | |
| 239 | skbuff_setsid_return: |
Paul Moore | 6c5b3fc | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 240 | if (secattr == &secattr_storage) |
| 241 | netlbl_secattr_destroy(secattr); |
Paul Moore | 948bf85 | 2008-10-10 10:16:32 -0400 | [diff] [blame] | 242 | return rc; |
| 243 | } |
| 244 | |
| 245 | /** |
Paul Moore | 389fb80 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 246 | * selinux_netlbl_inet_conn_request - Label an incoming stream connection |
| 247 | * @req: incoming connection request socket |
Paul Moore | 5778eab | 2007-02-28 15:14:22 -0500 | [diff] [blame] | 248 | * |
| 249 | * Description: |
Paul Moore | 389fb80 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 250 | * A new incoming connection request is represented by @req, we need to label |
| 251 | * the new request_sock here and the stack will ensure the on-the-wire label |
| 252 | * will get preserved when a full sock is created once the connection handshake |
| 253 | * is complete. Returns zero on success, negative values on failure. |
Paul Moore | 5778eab | 2007-02-28 15:14:22 -0500 | [diff] [blame] | 254 | * |
| 255 | */ |
Paul Moore | 389fb80 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 256 | int selinux_netlbl_inet_conn_request(struct request_sock *req, u16 family) |
Paul Moore | 5778eab | 2007-02-28 15:14:22 -0500 | [diff] [blame] | 257 | { |
Paul Moore | 014ab19 | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 258 | int rc; |
Paul Moore | 389fb80 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 259 | struct netlbl_lsm_secattr secattr; |
| 260 | |
| 261 | if (family != PF_INET) |
| 262 | return 0; |
| 263 | |
| 264 | netlbl_secattr_init(&secattr); |
| 265 | rc = security_netlbl_sid_to_secattr(req->secid, &secattr); |
| 266 | if (rc != 0) |
| 267 | goto inet_conn_request_return; |
| 268 | rc = netlbl_req_setattr(req, &secattr); |
| 269 | inet_conn_request_return: |
| 270 | netlbl_secattr_destroy(&secattr); |
| 271 | return rc; |
| 272 | } |
| 273 | |
| 274 | /** |
| 275 | * selinux_netlbl_inet_csk_clone - Initialize the newly created sock |
| 276 | * @sk: the new sock |
| 277 | * |
| 278 | * Description: |
| 279 | * A new connection has been established using @sk, we've already labeled the |
| 280 | * socket via the request_sock struct in selinux_netlbl_inet_conn_request() but |
| 281 | * we need to set the NetLabel state here since we now have a sock structure. |
| 282 | * |
| 283 | */ |
| 284 | void selinux_netlbl_inet_csk_clone(struct sock *sk, u16 family) |
| 285 | { |
Paul Moore | 014ab19 | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 286 | struct sk_security_struct *sksec = sk->sk_security; |
Paul Moore | 014ab19 | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 287 | |
Paul Moore | 389fb80 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 288 | if (family == PF_INET) |
Paul Moore | 014ab19 | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 289 | sksec->nlbl_state = NLBL_LABELED; |
Paul Moore | 389fb80 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 290 | else |
| 291 | sksec->nlbl_state = NLBL_UNSET; |
Paul Moore | 5778eab | 2007-02-28 15:14:22 -0500 | [diff] [blame] | 292 | } |
| 293 | |
| 294 | /** |
| 295 | * selinux_netlbl_socket_post_create - Label a socket using NetLabel |
| 296 | * @sock: the socket to label |
Paul Moore | 389fb80 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 297 | * @family: protocol family |
Paul Moore | 5778eab | 2007-02-28 15:14:22 -0500 | [diff] [blame] | 298 | * |
| 299 | * Description: |
| 300 | * Attempt to label a socket using the NetLabel mechanism using the given |
| 301 | * SID. Returns zero values on success, negative values on failure. |
| 302 | * |
| 303 | */ |
Paul Moore | 389fb80 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 304 | int selinux_netlbl_socket_post_create(struct sock *sk, u16 family) |
Paul Moore | 5778eab | 2007-02-28 15:14:22 -0500 | [diff] [blame] | 305 | { |
| 306 | int rc; |
Paul Moore | 389fb80 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 307 | struct sk_security_struct *sksec = sk->sk_security; |
| 308 | struct netlbl_lsm_secattr *secattr; |
Paul Moore | 5778eab | 2007-02-28 15:14:22 -0500 | [diff] [blame] | 309 | |
Paul Moore | 389fb80 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 310 | if (family != PF_INET) |
Paul Moore | 5778eab | 2007-02-28 15:14:22 -0500 | [diff] [blame] | 311 | return 0; |
Paul Moore | f74af6e | 2008-02-25 11:40:33 -0500 | [diff] [blame] | 312 | |
Paul Moore | 389fb80 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 313 | secattr = selinux_netlbl_sock_genattr(sk); |
| 314 | if (secattr == NULL) |
| 315 | return -ENOMEM; |
| 316 | rc = netlbl_sock_setattr(sk, family, secattr); |
| 317 | switch (rc) { |
| 318 | case 0: |
| 319 | sksec->nlbl_state = NLBL_LABELED; |
| 320 | break; |
| 321 | case -EDESTADDRREQ: |
| 322 | sksec->nlbl_state = NLBL_REQSKB; |
Paul Moore | f74af6e | 2008-02-25 11:40:33 -0500 | [diff] [blame] | 323 | rc = 0; |
Paul Moore | 389fb80 | 2009-03-27 17:10:34 -0400 | [diff] [blame] | 324 | break; |
| 325 | } |
Paul Moore | 5778eab | 2007-02-28 15:14:22 -0500 | [diff] [blame] | 326 | |
| 327 | return rc; |
| 328 | } |
| 329 | |
| 330 | /** |
| 331 | * selinux_netlbl_sock_rcv_skb - Do an inbound access check using NetLabel |
| 332 | * @sksec: the sock's sk_security_struct |
| 333 | * @skb: the packet |
Paul Moore | 75e2291 | 2008-01-29 08:38:04 -0500 | [diff] [blame] | 334 | * @family: protocol family |
Paul Moore | 5778eab | 2007-02-28 15:14:22 -0500 | [diff] [blame] | 335 | * @ad: the audit data |
| 336 | * |
| 337 | * Description: |
| 338 | * Fetch the NetLabel security attributes from @skb and perform an access check |
| 339 | * against the receiving socket. Returns zero on success, negative values on |
| 340 | * error. |
| 341 | * |
| 342 | */ |
| 343 | int selinux_netlbl_sock_rcv_skb(struct sk_security_struct *sksec, |
| 344 | struct sk_buff *skb, |
Paul Moore | 75e2291 | 2008-01-29 08:38:04 -0500 | [diff] [blame] | 345 | u16 family, |
Thomas Liu | 2bf4969 | 2009-07-14 12:14:09 -0400 | [diff] [blame] | 346 | struct common_audit_data *ad) |
Paul Moore | 5778eab | 2007-02-28 15:14:22 -0500 | [diff] [blame] | 347 | { |
| 348 | int rc; |
Paul Moore | f36158c | 2007-07-18 12:28:46 -0400 | [diff] [blame] | 349 | u32 nlbl_sid; |
| 350 | u32 perm; |
| 351 | struct netlbl_lsm_secattr secattr; |
Paul Moore | 5778eab | 2007-02-28 15:14:22 -0500 | [diff] [blame] | 352 | |
Paul Moore | 23bcdc1 | 2007-07-18 12:28:45 -0400 | [diff] [blame] | 353 | if (!netlbl_enabled()) |
| 354 | return 0; |
| 355 | |
Paul Moore | f36158c | 2007-07-18 12:28:46 -0400 | [diff] [blame] | 356 | netlbl_secattr_init(&secattr); |
Paul Moore | 75e2291 | 2008-01-29 08:38:04 -0500 | [diff] [blame] | 357 | rc = netlbl_skbuff_getattr(skb, family, &secattr); |
Paul Moore | 5dbe1eb | 2008-01-29 08:44:18 -0500 | [diff] [blame] | 358 | if (rc == 0 && secattr.flags != NETLBL_SECATTR_NONE) |
| 359 | rc = selinux_netlbl_sidlookup_cached(skb, &secattr, &nlbl_sid); |
| 360 | else |
Paul Moore | f36158c | 2007-07-18 12:28:46 -0400 | [diff] [blame] | 361 | nlbl_sid = SECINITSID_UNLABELED; |
| 362 | netlbl_secattr_destroy(&secattr); |
Paul Moore | 5778eab | 2007-02-28 15:14:22 -0500 | [diff] [blame] | 363 | if (rc != 0) |
| 364 | return rc; |
Linus Torvalds | 8d9107e | 2007-07-13 16:53:18 -0700 | [diff] [blame] | 365 | |
Paul Moore | 5778eab | 2007-02-28 15:14:22 -0500 | [diff] [blame] | 366 | switch (sksec->sclass) { |
| 367 | case SECCLASS_UDP_SOCKET: |
Paul Moore | f36158c | 2007-07-18 12:28:46 -0400 | [diff] [blame] | 368 | perm = UDP_SOCKET__RECVFROM; |
Paul Moore | 5778eab | 2007-02-28 15:14:22 -0500 | [diff] [blame] | 369 | break; |
| 370 | case SECCLASS_TCP_SOCKET: |
Paul Moore | f36158c | 2007-07-18 12:28:46 -0400 | [diff] [blame] | 371 | perm = TCP_SOCKET__RECVFROM; |
Paul Moore | 5778eab | 2007-02-28 15:14:22 -0500 | [diff] [blame] | 372 | break; |
| 373 | default: |
Paul Moore | f36158c | 2007-07-18 12:28:46 -0400 | [diff] [blame] | 374 | perm = RAWIP_SOCKET__RECVFROM; |
Paul Moore | 5778eab | 2007-02-28 15:14:22 -0500 | [diff] [blame] | 375 | } |
| 376 | |
Paul Moore | f36158c | 2007-07-18 12:28:46 -0400 | [diff] [blame] | 377 | rc = avc_has_perm(sksec->sid, nlbl_sid, sksec->sclass, perm, ad); |
Paul Moore | 5778eab | 2007-02-28 15:14:22 -0500 | [diff] [blame] | 378 | if (rc == 0) |
| 379 | return 0; |
| 380 | |
Paul Moore | f36158c | 2007-07-18 12:28:46 -0400 | [diff] [blame] | 381 | if (nlbl_sid != SECINITSID_UNLABELED) |
Paul Moore | dfaebe9 | 2008-10-10 10:16:31 -0400 | [diff] [blame] | 382 | netlbl_skbuff_err(skb, rc, 0); |
Paul Moore | 5778eab | 2007-02-28 15:14:22 -0500 | [diff] [blame] | 383 | return rc; |
| 384 | } |
| 385 | |
| 386 | /** |
| 387 | * selinux_netlbl_socket_setsockopt - Do not allow users to remove a NetLabel |
| 388 | * @sock: the socket |
| 389 | * @level: the socket level or protocol |
| 390 | * @optname: the socket option name |
| 391 | * |
| 392 | * Description: |
| 393 | * Check the setsockopt() call and if the user is trying to replace the IP |
| 394 | * options on a socket and a NetLabel is in place for the socket deny the |
| 395 | * access; otherwise allow the access. Returns zero when the access is |
| 396 | * allowed, -EACCES when denied, and other negative values on error. |
| 397 | * |
| 398 | */ |
| 399 | int selinux_netlbl_socket_setsockopt(struct socket *sock, |
| 400 | int level, |
| 401 | int optname) |
| 402 | { |
| 403 | int rc = 0; |
Paul Moore | ba6ff9f | 2007-06-07 18:37:15 -0700 | [diff] [blame] | 404 | struct sock *sk = sock->sk; |
| 405 | struct sk_security_struct *sksec = sk->sk_security; |
Paul Moore | 5778eab | 2007-02-28 15:14:22 -0500 | [diff] [blame] | 406 | struct netlbl_lsm_secattr secattr; |
| 407 | |
Paul Moore | 5778eab | 2007-02-28 15:14:22 -0500 | [diff] [blame] | 408 | if (level == IPPROTO_IP && optname == IP_OPTIONS && |
Paul Moore | 014ab19 | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 409 | (sksec->nlbl_state == NLBL_LABELED || |
| 410 | sksec->nlbl_state == NLBL_CONNLABELED)) { |
Paul Moore | 5778eab | 2007-02-28 15:14:22 -0500 | [diff] [blame] | 411 | netlbl_secattr_init(&secattr); |
Paul Moore | ba6ff9f | 2007-06-07 18:37:15 -0700 | [diff] [blame] | 412 | lock_sock(sk); |
| 413 | rc = netlbl_sock_getattr(sk, &secattr); |
| 414 | release_sock(sk); |
Paul Moore | 09c50b4 | 2009-02-20 16:33:02 -0500 | [diff] [blame] | 415 | if (rc == 0) |
Paul Moore | 5778eab | 2007-02-28 15:14:22 -0500 | [diff] [blame] | 416 | rc = -EACCES; |
Paul Moore | 09c50b4 | 2009-02-20 16:33:02 -0500 | [diff] [blame] | 417 | else if (rc == -ENOMSG) |
| 418 | rc = 0; |
Paul Moore | 5778eab | 2007-02-28 15:14:22 -0500 | [diff] [blame] | 419 | netlbl_secattr_destroy(&secattr); |
| 420 | } |
Paul Moore | 5778eab | 2007-02-28 15:14:22 -0500 | [diff] [blame] | 421 | |
| 422 | return rc; |
| 423 | } |
Paul Moore | 014ab19 | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 424 | |
| 425 | /** |
| 426 | * selinux_netlbl_socket_connect - Label a client-side socket on connect |
| 427 | * @sk: the socket to label |
| 428 | * @addr: the destination address |
| 429 | * |
| 430 | * Description: |
| 431 | * Attempt to label a connected socket with NetLabel using the given address. |
| 432 | * Returns zero values on success, negative values on failure. |
| 433 | * |
| 434 | */ |
| 435 | int selinux_netlbl_socket_connect(struct sock *sk, struct sockaddr *addr) |
| 436 | { |
| 437 | int rc; |
| 438 | struct sk_security_struct *sksec = sk->sk_security; |
Paul Moore | 6c5b3fc | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 439 | struct netlbl_lsm_secattr *secattr; |
Paul Moore | 014ab19 | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 440 | |
| 441 | if (sksec->nlbl_state != NLBL_REQSKB && |
| 442 | sksec->nlbl_state != NLBL_CONNLABELED) |
| 443 | return 0; |
| 444 | |
Paul Moore | 014ab19 | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 445 | local_bh_disable(); |
| 446 | bh_lock_sock_nested(sk); |
| 447 | |
| 448 | /* connected sockets are allowed to disconnect when the address family |
| 449 | * is set to AF_UNSPEC, if that is what is happening we want to reset |
| 450 | * the socket */ |
| 451 | if (addr->sa_family == AF_UNSPEC) { |
| 452 | netlbl_sock_delattr(sk); |
| 453 | sksec->nlbl_state = NLBL_REQSKB; |
| 454 | rc = 0; |
| 455 | goto socket_connect_return; |
| 456 | } |
Paul Moore | 6c5b3fc | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 457 | secattr = selinux_netlbl_sock_genattr(sk); |
| 458 | if (secattr == NULL) { |
| 459 | rc = -ENOMEM; |
Paul Moore | 014ab19 | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 460 | goto socket_connect_return; |
Paul Moore | 6c5b3fc | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 461 | } |
| 462 | rc = netlbl_conn_setattr(sk, addr, secattr); |
| 463 | if (rc == 0) |
| 464 | sksec->nlbl_state = NLBL_CONNLABELED; |
Paul Moore | 014ab19 | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 465 | |
| 466 | socket_connect_return: |
| 467 | bh_unlock_sock(sk); |
| 468 | local_bh_enable(); |
Paul Moore | 014ab19 | 2008-10-10 10:16:33 -0400 | [diff] [blame] | 469 | return rc; |
| 470 | } |