diff options
Diffstat (limited to 'ANDROID_3.4.5/security/selinux/netlabel.c')
| -rw-r--r-- | ANDROID_3.4.5/security/selinux/netlabel.c | 470 |
1 files changed, 0 insertions, 470 deletions
diff --git a/ANDROID_3.4.5/security/selinux/netlabel.c b/ANDROID_3.4.5/security/selinux/netlabel.c deleted file mode 100644 index da4b8b23..00000000 --- a/ANDROID_3.4.5/security/selinux/netlabel.c +++ /dev/null @@ -1,470 +0,0 @@ -/* - * SELinux NetLabel Support - * - * This file provides the necessary glue to tie NetLabel into the SELinux - * subsystem. - * - * Author: Paul Moore <paul@paul-moore.com> - * - */ - -/* - * (c) Copyright Hewlett-Packard Development Company, L.P., 2007, 2008 - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See - * the GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - * - */ - -#include <linux/spinlock.h> -#include <linux/rcupdate.h> -#include <linux/gfp.h> -#include <linux/ip.h> -#include <linux/ipv6.h> -#include <net/sock.h> -#include <net/netlabel.h> -#include <net/ip.h> -#include <net/ipv6.h> - -#include "objsec.h" -#include "security.h" -#include "netlabel.h" - -/** - * selinux_netlbl_sidlookup_cached - Cache a SID lookup - * @skb: the packet - * @secattr: the NetLabel security attributes - * @sid: the SID - * - * Description: - * Query the SELinux security server to lookup the correct SID for the given - * security attributes. If the query is successful, cache the result to speed - * up future lookups. Returns zero on success, negative values on failure. - * - */ -static int selinux_netlbl_sidlookup_cached(struct sk_buff *skb, - struct netlbl_lsm_secattr *secattr, - u32 *sid) -{ - int rc; - - rc = security_netlbl_secattr_to_sid(secattr, sid); - if (rc == 0 && - (secattr->flags & NETLBL_SECATTR_CACHEABLE) && - (secattr->flags & NETLBL_SECATTR_CACHE)) - netlbl_cache_add(skb, secattr); - - return rc; -} - -/** - * selinux_netlbl_sock_genattr - Generate the NetLabel socket secattr - * @sk: the socket - * - * Description: - * Generate the NetLabel security attributes for a socket, making full use of - * the socket's attribute cache. Returns a pointer to the security attributes - * on success, NULL on failure. - * - */ -static struct netlbl_lsm_secattr *selinux_netlbl_sock_genattr(struct sock *sk) -{ - int rc; - struct sk_security_struct *sksec = sk->sk_security; - struct netlbl_lsm_secattr *secattr; - - if (sksec->nlbl_secattr != NULL) - return sksec->nlbl_secattr; - - secattr = netlbl_secattr_alloc(GFP_ATOMIC); - if (secattr == NULL) - return NULL; - rc = security_netlbl_sid_to_secattr(sksec->sid, secattr); - if (rc != 0) { - netlbl_secattr_free(secattr); - return NULL; - } - sksec->nlbl_secattr = secattr; - - return secattr; -} - -/** - * selinux_netlbl_cache_invalidate - Invalidate the NetLabel cache - * - * Description: - * Invalidate the NetLabel security attribute mapping cache. - * - */ -void selinux_netlbl_cache_invalidate(void) -{ - netlbl_cache_invalidate(); -} - -/** - * selinux_netlbl_err - Handle a NetLabel packet error - * @skb: the packet - * @error: the error code - * @gateway: true if host is acting as a gateway, false otherwise - * - * Description: - * When a packet is dropped due to a call to avc_has_perm() pass the error - * code to the NetLabel subsystem so any protocol specific processing can be - * done. This is safe to call even if you are unsure if NetLabel labeling is - * present on the packet, NetLabel is smart enough to only act when it should. - * - */ -void selinux_netlbl_err(struct sk_buff *skb, int error, int gateway) -{ - netlbl_skbuff_err(skb, error, gateway); -} - -/** - * selinux_netlbl_sk_security_free - Free the NetLabel fields - * @sksec: the sk_security_struct - * - * Description: - * Free all of the memory in the NetLabel fields of a sk_security_struct. - * - */ -void selinux_netlbl_sk_security_free(struct sk_security_struct *sksec) -{ - if (sksec->nlbl_secattr != NULL) - netlbl_secattr_free(sksec->nlbl_secattr); -} - -/** - * selinux_netlbl_sk_security_reset - Reset the NetLabel fields - * @sksec: the sk_security_struct - * @family: the socket family - * - * Description: - * Called when the NetLabel state of a sk_security_struct needs to be reset. - * The caller is responsible for all the NetLabel sk_security_struct locking. - * - */ -void selinux_netlbl_sk_security_reset(struct sk_security_struct *sksec) -{ - sksec->nlbl_state = NLBL_UNSET; -} - -/** - * selinux_netlbl_skbuff_getsid - Get the sid of a packet using NetLabel - * @skb: the packet - * @family: protocol family - * @type: NetLabel labeling protocol type - * @sid: the SID - * - * Description: - * Call the NetLabel mechanism to get the security attributes of the given - * packet and use those attributes to determine the correct context/SID to - * assign to the packet. Returns zero on success, negative values on failure. - * - */ -int selinux_netlbl_skbuff_getsid(struct sk_buff *skb, - u16 family, - u32 *type, - u32 *sid) -{ - int rc; - struct netlbl_lsm_secattr secattr; - - if (!netlbl_enabled()) { - *sid = SECSID_NULL; - return 0; - } - - netlbl_secattr_init(&secattr); - rc = netlbl_skbuff_getattr(skb, family, &secattr); - if (rc == 0 && secattr.flags != NETLBL_SECATTR_NONE) - rc = selinux_netlbl_sidlookup_cached(skb, &secattr, sid); - else - *sid = SECSID_NULL; - *type = secattr.type; - netlbl_secattr_destroy(&secattr); - - return rc; -} - -/** - * selinux_netlbl_skbuff_setsid - Set the NetLabel on a packet given a sid - * @skb: the packet - * @family: protocol family - * @sid: the SID - * - * Description - * Call the NetLabel mechanism to set the label of a packet using @sid. - * Returns zero on success, negative values on failure. - * - */ -int selinux_netlbl_skbuff_setsid(struct sk_buff *skb, - u16 family, - u32 sid) -{ - int rc; - struct netlbl_lsm_secattr secattr_storage; - struct netlbl_lsm_secattr *secattr = NULL; - struct sock *sk; - - /* if this is a locally generated packet check to see if it is already - * being labeled by it's parent socket, if it is just exit */ - sk = skb->sk; - if (sk != NULL) { - struct sk_security_struct *sksec = sk->sk_security; - if (sksec->nlbl_state != NLBL_REQSKB) - return 0; - secattr = sksec->nlbl_secattr; - } - if (secattr == NULL) { - secattr = &secattr_storage; - netlbl_secattr_init(secattr); - rc = security_netlbl_sid_to_secattr(sid, secattr); - if (rc != 0) - goto skbuff_setsid_return; - } - - rc = netlbl_skbuff_setattr(skb, family, secattr); - -skbuff_setsid_return: - if (secattr == &secattr_storage) - netlbl_secattr_destroy(secattr); - return rc; -} - -/** - * selinux_netlbl_inet_conn_request - Label an incoming stream connection - * @req: incoming connection request socket - * - * Description: - * A new incoming connection request is represented by @req, we need to label - * the new request_sock here and the stack will ensure the on-the-wire label - * will get preserved when a full sock is created once the connection handshake - * is complete. Returns zero on success, negative values on failure. - * - */ -int selinux_netlbl_inet_conn_request(struct request_sock *req, u16 family) -{ - int rc; - struct netlbl_lsm_secattr secattr; - - if (family != PF_INET) - return 0; - - netlbl_secattr_init(&secattr); - rc = security_netlbl_sid_to_secattr(req->secid, &secattr); - if (rc != 0) - goto inet_conn_request_return; - rc = netlbl_req_setattr(req, &secattr); -inet_conn_request_return: - netlbl_secattr_destroy(&secattr); - return rc; -} - -/** - * selinux_netlbl_inet_csk_clone - Initialize the newly created sock - * @sk: the new sock - * - * Description: - * A new connection has been established using @sk, we've already labeled the - * socket via the request_sock struct in selinux_netlbl_inet_conn_request() but - * we need to set the NetLabel state here since we now have a sock structure. - * - */ -void selinux_netlbl_inet_csk_clone(struct sock *sk, u16 family) -{ - struct sk_security_struct *sksec = sk->sk_security; - - if (family == PF_INET) - sksec->nlbl_state = NLBL_LABELED; - else - sksec->nlbl_state = NLBL_UNSET; -} - -/** - * selinux_netlbl_socket_post_create - Label a socket using NetLabel - * @sock: the socket to label - * @family: protocol family - * - * Description: - * Attempt to label a socket using the NetLabel mechanism using the given - * SID. Returns zero values on success, negative values on failure. - * - */ -int selinux_netlbl_socket_post_create(struct sock *sk, u16 family) -{ - int rc; - struct sk_security_struct *sksec = sk->sk_security; - struct netlbl_lsm_secattr *secattr; - - if (family != PF_INET) - return 0; - - secattr = selinux_netlbl_sock_genattr(sk); - if (secattr == NULL) - return -ENOMEM; - rc = netlbl_sock_setattr(sk, family, secattr); - switch (rc) { - case 0: - sksec->nlbl_state = NLBL_LABELED; - break; - case -EDESTADDRREQ: - sksec->nlbl_state = NLBL_REQSKB; - rc = 0; - break; - } - - return rc; -} - -/** - * selinux_netlbl_sock_rcv_skb - Do an inbound access check using NetLabel - * @sksec: the sock's sk_security_struct - * @skb: the packet - * @family: protocol family - * @ad: the audit data - * - * Description: - * Fetch the NetLabel security attributes from @skb and perform an access check - * against the receiving socket. Returns zero on success, negative values on - * error. - * - */ -int selinux_netlbl_sock_rcv_skb(struct sk_security_struct *sksec, - struct sk_buff *skb, - u16 family, - struct common_audit_data *ad) -{ - int rc; - u32 nlbl_sid; - u32 perm; - struct netlbl_lsm_secattr secattr; - - if (!netlbl_enabled()) - return 0; - - netlbl_secattr_init(&secattr); - rc = netlbl_skbuff_getattr(skb, family, &secattr); - if (rc == 0 && secattr.flags != NETLBL_SECATTR_NONE) - rc = selinux_netlbl_sidlookup_cached(skb, &secattr, &nlbl_sid); - else - nlbl_sid = SECINITSID_UNLABELED; - netlbl_secattr_destroy(&secattr); - if (rc != 0) - return rc; - - switch (sksec->sclass) { - case SECCLASS_UDP_SOCKET: - perm = UDP_SOCKET__RECVFROM; - break; - case SECCLASS_TCP_SOCKET: - perm = TCP_SOCKET__RECVFROM; - break; - default: - perm = RAWIP_SOCKET__RECVFROM; - } - - rc = avc_has_perm(sksec->sid, nlbl_sid, sksec->sclass, perm, ad); - if (rc == 0) - return 0; - - if (nlbl_sid != SECINITSID_UNLABELED) - netlbl_skbuff_err(skb, rc, 0); - return rc; -} - -/** - * selinux_netlbl_socket_setsockopt - Do not allow users to remove a NetLabel - * @sock: the socket - * @level: the socket level or protocol - * @optname: the socket option name - * - * Description: - * Check the setsockopt() call and if the user is trying to replace the IP - * options on a socket and a NetLabel is in place for the socket deny the - * access; otherwise allow the access. Returns zero when the access is - * allowed, -EACCES when denied, and other negative values on error. - * - */ -int selinux_netlbl_socket_setsockopt(struct socket *sock, - int level, - int optname) -{ - int rc = 0; - struct sock *sk = sock->sk; - struct sk_security_struct *sksec = sk->sk_security; - struct netlbl_lsm_secattr secattr; - - if (level == IPPROTO_IP && optname == IP_OPTIONS && - (sksec->nlbl_state == NLBL_LABELED || - sksec->nlbl_state == NLBL_CONNLABELED)) { - netlbl_secattr_init(&secattr); - lock_sock(sk); - rc = netlbl_sock_getattr(sk, &secattr); - release_sock(sk); - if (rc == 0) - rc = -EACCES; - else if (rc == -ENOMSG) - rc = 0; - netlbl_secattr_destroy(&secattr); - } - - return rc; -} - -/** - * selinux_netlbl_socket_connect - Label a client-side socket on connect - * @sk: the socket to label - * @addr: the destination address - * - * Description: - * Attempt to label a connected socket with NetLabel using the given address. - * Returns zero values on success, negative values on failure. - * - */ -int selinux_netlbl_socket_connect(struct sock *sk, struct sockaddr *addr) -{ - int rc; - struct sk_security_struct *sksec = sk->sk_security; - struct netlbl_lsm_secattr *secattr; - - if (sksec->nlbl_state != NLBL_REQSKB && - sksec->nlbl_state != NLBL_CONNLABELED) - return 0; - - local_bh_disable(); - bh_lock_sock_nested(sk); - - /* connected sockets are allowed to disconnect when the address family - * is set to AF_UNSPEC, if that is what is happening we want to reset - * the socket */ - if (addr->sa_family == AF_UNSPEC) { - netlbl_sock_delattr(sk); - sksec->nlbl_state = NLBL_REQSKB; - rc = 0; - goto socket_connect_return; - } - secattr = selinux_netlbl_sock_genattr(sk); - if (secattr == NULL) { - rc = -ENOMEM; - goto socket_connect_return; - } - rc = netlbl_conn_setattr(sk, addr, secattr); - if (rc == 0) - sksec->nlbl_state = NLBL_CONNLABELED; - -socket_connect_return: - bh_unlock_sock(sk); - local_bh_enable(); - return rc; -} |