diff options
Diffstat (limited to 'security/selinux')
| -rw-r--r-- | security/selinux/Makefile | 2 | ||||
| -rw-r--r-- | security/selinux/include/security.h | 24 | ||||
| -rw-r--r-- | security/selinux/include/selinux_netlabel.h | 71 | ||||
| -rw-r--r-- | security/selinux/netlabel.c | 363 | ||||
| -rw-r--r-- | security/selinux/ss/services.c | 423 |
5 files changed, 481 insertions, 402 deletions
diff --git a/security/selinux/Makefile b/security/selinux/Makefile index faf2e02e441..dc3502e30b1 100644 --- a/security/selinux/Makefile +++ b/security/selinux/Makefile @@ -8,5 +8,7 @@ selinux-y := avc.o hooks.o selinuxfs.o netlink.o nlmsgtab.o netif.o exports.o selinux-$(CONFIG_SECURITY_NETWORK_XFRM) += xfrm.o +selinux-$(CONFIG_NETLABEL) += netlabel.o + EXTRA_CFLAGS += -Isecurity/selinux/include diff --git a/security/selinux/include/security.h b/security/selinux/include/security.h index 210eec77e7f..605b07165af 100644 --- a/security/selinux/include/security.h +++ b/security/selinux/include/security.h @@ -35,6 +35,7 @@ #endif struct sk_buff; +struct netlbl_lsm_secattr; extern int selinux_enabled; extern int selinux_mls_enabled; @@ -102,5 +103,28 @@ int security_fs_use(const char *fstype, unsigned int *behavior, int security_genfs_sid(const char *fstype, char *name, u16 sclass, u32 *sid); +#ifdef CONFIG_NETLABEL +int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr, + u32 base_sid, + u32 *sid); + +int security_netlbl_sid_to_secattr(u32 sid, + struct netlbl_lsm_secattr *secattr); +#else +static inline int security_netlbl_secattr_to_sid( + struct netlbl_lsm_secattr *secattr, + u32 base_sid, + u32 *sid) +{ + return -EIDRM; +} + +static inline int security_netlbl_sid_to_secattr(u32 sid, + struct netlbl_lsm_secattr *secattr) +{ + return -ENOENT; +} +#endif /* CONFIG_NETLABEL */ + #endif /* _SELINUX_SECURITY_H_ */ diff --git a/security/selinux/include/selinux_netlabel.h b/security/selinux/include/selinux_netlabel.h index 2a732c9033e..218e3f77c35 100644 --- a/security/selinux/include/selinux_netlabel.h +++ b/security/selinux/include/selinux_netlabel.h @@ -38,19 +38,22 @@ #ifdef CONFIG_NETLABEL void selinux_netlbl_cache_invalidate(void); -int selinux_netlbl_skbuff_getsid(struct sk_buff *skb, u32 base_sid, u32 *sid); -int selinux_netlbl_socket_post_create(struct socket *sock); -void selinux_netlbl_sock_graft(struct sock *sk, struct socket *sock); -int selinux_netlbl_sock_rcv_skb(struct sk_security_struct *sksec, - struct sk_buff *skb, - struct avc_audit_data *ad); + void selinux_netlbl_sk_security_reset(struct sk_security_struct *ssec, int family); void selinux_netlbl_sk_security_init(struct sk_security_struct *ssec, int family); void selinux_netlbl_sk_security_clone(struct sk_security_struct *ssec, struct sk_security_struct *newssec); + +int selinux_netlbl_skbuff_getsid(struct sk_buff *skb, u32 base_sid, u32 *sid); + +void selinux_netlbl_sock_graft(struct sock *sk, struct socket *sock); +int selinux_netlbl_socket_post_create(struct socket *sock); int selinux_netlbl_inode_permission(struct inode *inode, int mask); +int selinux_netlbl_sock_rcv_skb(struct sk_security_struct *sksec, + struct sk_buff *skb, + struct avc_audit_data *ad); int selinux_netlbl_socket_setsockopt(struct socket *sock, int level, int optname); @@ -60,59 +63,53 @@ static inline void selinux_netlbl_cache_invalidate(void) return; } -static inline int selinux_netlbl_skbuff_getsid(struct sk_buff *skb, - u32 base_sid, - u32 *sid) +static inline void selinux_netlbl_sk_security_reset( + struct sk_security_struct *ssec, + int family) { - *sid = SECSID_NULL; - return 0; + return; } - -static inline int selinux_netlbl_socket_post_create(struct socket *sock) +static inline void selinux_netlbl_sk_security_init( + struct sk_security_struct *ssec, + int family) { - return 0; + return; } - -static inline void selinux_netlbl_sock_graft(struct sock *sk, - struct socket *sock) +static inline void selinux_netlbl_sk_security_clone( + struct sk_security_struct *ssec, + struct sk_security_struct *newssec) { return; } -static inline int selinux_netlbl_sock_rcv_skb(struct sk_security_struct *sksec, - struct sk_buff *skb, - struct avc_audit_data *ad) +static inline int selinux_netlbl_skbuff_getsid(struct sk_buff *skb, + u32 base_sid, + u32 *sid) { + *sid = SECSID_NULL; return 0; } -static inline void selinux_netlbl_sk_security_reset( - struct sk_security_struct *ssec, - int family) -{ - return; -} - -static inline void selinux_netlbl_sk_security_init( - struct sk_security_struct *ssec, - int family) +static inline void selinux_netlbl_sock_graft(struct sock *sk, + struct socket *sock) { return; } - -static inline void selinux_netlbl_sk_security_clone( - struct sk_security_struct *ssec, - struct sk_security_struct *newssec) +static inline int selinux_netlbl_socket_post_create(struct socket *sock) { - return; + return 0; } - static inline int selinux_netlbl_inode_permission(struct inode *inode, int mask) { return 0; } - +static inline int selinux_netlbl_sock_rcv_skb(struct sk_security_struct *sksec, + struct sk_buff *skb, + struct avc_audit_data *ad) +{ + return 0; +} static inline int selinux_netlbl_socket_setsockopt(struct socket *sock, int level, int optname) diff --git a/security/selinux/netlabel.c b/security/selinux/netlabel.c new file mode 100644 index 00000000000..bf8750791dd --- /dev/null +++ b/security/selinux/netlabel.c @@ -0,0 +1,363 @@ +/* + * SELinux NetLabel Support + * + * This file provides the necessary glue to tie NetLabel into the SELinux + * subsystem. + * + * Author: Paul Moore <paul.moore@hp.com> + * + */ + +/* + * (c) Copyright Hewlett-Packard Development Company, L.P., 2007 + * + * 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 <net/sock.h> +#include <net/netlabel.h> + +#include "objsec.h" +#include "security.h" + +/** + * selinux_netlbl_socket_setsid - Label a socket using the NetLabel mechanism + * @sock: the socket to label + * @sid: the SID to use + * + * Description: + * Attempt to label a socket using the NetLabel mechanism using the given + * SID. Returns zero values on success, negative values on failure. The + * caller is responsibile for calling rcu_read_lock() before calling this + * this function and rcu_read_unlock() after this function returns. + * + */ +static int selinux_netlbl_socket_setsid(struct socket *sock, u32 sid) +{ + int rc; + struct sk_security_struct *sksec = sock->sk->sk_security; + struct netlbl_lsm_secattr secattr; + + rc = security_netlbl_sid_to_secattr(sid, &secattr); + if (rc != 0) + return rc; + + rc = netlbl_socket_setattr(sock, &secattr); + if (rc == 0) { + spin_lock_bh(&sksec->nlbl_lock); + sksec->nlbl_state = NLBL_LABELED; + spin_unlock_bh(&sksec->nlbl_lock); + } + + return rc; +} + +/** + * 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_sk_security_reset - Reset the NetLabel fields + * @ssec: 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 responsibile for all the NetLabel sk_security_struct locking. + * + */ +void selinux_netlbl_sk_security_reset(struct sk_security_struct *ssec, + int family) +{ + if (family == PF_INET) + ssec->nlbl_state = NLBL_REQUIRE; + else + ssec->nlbl_state = NLBL_UNSET; +} + +/** + * selinux_netlbl_sk_security_init - Setup the NetLabel fields + * @ssec: the sk_security_struct + * @family: the socket family + * + * Description: + * Called when a new sk_security_struct is allocated to initialize the NetLabel + * fields. + * + */ +void selinux_netlbl_sk_security_init(struct sk_security_struct *ssec, + int family) +{ + /* No locking needed, we are the only one who has access to ssec */ + selinux_netlbl_sk_security_reset(ssec, family); + spin_lock_init(&ssec->nlbl_lock); +} + +/** + * selinux_netlbl_sk_security_clone - Copy the NetLabel fields + * @ssec: the original sk_security_struct + * @newssec: the cloned sk_security_struct + * + * Description: + * Clone the NetLabel specific sk_security_struct fields from @ssec to + * @newssec. + * + */ +void selinux_netlbl_sk_security_clone(struct sk_security_struct *ssec, + struct sk_security_struct *newssec) +{ + /* We don't need to take newssec->nlbl_lock because we are the only + * thread with access to newssec, but we do need to take the RCU read + * lock as other threads could have access to ssec */ + rcu_read_lock(); + selinux_netlbl_sk_security_reset(newssec, ssec->sk->sk_family); + newssec->sclass = ssec->sclass; + rcu_read_unlock(); +} + +/** + * selinux_netlbl_skbuff_getsid - Get the sid of a packet using NetLabel + * @skb: the packet + * @base_sid: the SELinux SID to use as a context for MLS only attributes + * @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, u32 base_sid, u32 *sid) +{ + int rc; + struct netlbl_lsm_secattr secattr; + + netlbl_secattr_init(&secattr); + rc = netlbl_skbuff_getattr(skb, &secattr); + if (rc == 0 && secattr.flags != NETLBL_SECATTR_NONE) + rc = security_netlbl_secattr_to_sid(&secattr, + base_sid, + sid); + else + *sid = SECSID_NULL; + netlbl_secattr_destroy(&secattr); + + return rc; +} + +/** + * selinux_netlbl_sock_graft - Netlabel the new socket + * @sk: the new connection + * @sock: the new socket + * + * Description: + * The connection represented by @sk is being grafted onto @sock so set the + * socket's NetLabel to match the SID of @sk. + * + */ +void selinux_netlbl_sock_graft(struct sock *sk, struct socket *sock) +{ + struct inode_security_struct *isec = SOCK_INODE(sock)->i_security; + struct sk_security_struct *sksec = sk->sk_security; + struct netlbl_lsm_secattr secattr; + u32 nlbl_peer_sid; + + sksec->sclass = isec->sclass; + + rcu_read_lock(); + + if (sksec->nlbl_state != NLBL_REQUIRE) { + rcu_read_unlock(); + return; + } + + netlbl_secattr_init(&secattr); + if (netlbl_sock_getattr(sk, &secattr) == 0 && + secattr.flags != NETLBL_SECATTR_NONE && + security_netlbl_secattr_to_sid(&secattr, + SECINITSID_UNLABELED, + &nlbl_peer_sid) == 0) + sksec->peer_sid = nlbl_peer_sid; + netlbl_secattr_destroy(&secattr); + + /* Try to set the NetLabel on the socket to save time later, if we fail + * here we will pick up the pieces in later calls to + * selinux_netlbl_inode_permission(). */ + selinux_netlbl_socket_setsid(sock, sksec->sid); + + rcu_read_unlock(); +} + +/** + * selinux_netlbl_socket_post_create - Label a socket using NetLabel + * @sock: the socket to label + * + * 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 socket *sock) +{ + int rc = 0; + struct inode_security_struct *isec = SOCK_INODE(sock)->i_security; + struct sk_security_struct *sksec = sock->sk->sk_security; + + sksec->sclass = isec->sclass; + + rcu_read_lock(); + if (sksec->nlbl_state == NLBL_REQUIRE) + rc = selinux_netlbl_socket_setsid(sock, sksec->sid); + rcu_read_unlock(); + + return rc; +} + +/** + * selinux_netlbl_inode_permission - Verify the socket is NetLabel labeled + * @inode: the file descriptor's inode + * @mask: the permission mask + * + * Description: + * Looks at a file's inode and if it is marked as a socket protected by + * NetLabel then verify that the socket has been labeled, if not try to label + * the socket now with the inode's SID. Returns zero on success, negative + * values on failure. + * + */ +int selinux_netlbl_inode_permission(struct inode *inode, int mask) +{ + int rc; + struct sk_security_struct *sksec; + struct socket *sock; + + if (!S_ISSOCK(inode->i_mode) || + ((mask & (MAY_WRITE | MAY_APPEND)) == 0)) + return 0; + sock = SOCKET_I(inode); + sksec = sock->sk->sk_security; + + rcu_read_lock(); + if (sksec->nlbl_state != NLBL_REQUIRE) { + rcu_read_unlock(); + return 0; + } + local_bh_disable(); + bh_lock_sock_nested(sock->sk); + rc = selinux_netlbl_socket_setsid(sock, sksec->sid); + bh_unlock_sock(sock->sk); + local_bh_enable(); + rcu_read_unlock(); + + return rc; +} + +/** + * selinux_netlbl_sock_rcv_skb - Do an inbound access check using NetLabel + * @sksec: the sock's sk_security_struct + * @skb: the packet + * @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, + struct avc_audit_data *ad) +{ + int rc; + u32 netlbl_sid; + u32 recv_perm; + + rc = selinux_netlbl_skbuff_getsid(skb, + SECINITSID_UNLABELED, + &netlbl_sid); + if (rc != 0) + return rc; + + if (netlbl_sid == SECSID_NULL) + return 0; + + switch (sksec->sclass) { + case SECCLASS_UDP_SOCKET: + recv_perm = UDP_SOCKET__RECVFROM; + break; + case SECCLASS_TCP_SOCKET: + recv_perm = TCP_SOCKET__RECVFROM; + break; + default: + recv_perm = RAWIP_SOCKET__RECVFROM; + } + + rc = avc_has_perm(sksec->sid, + netlbl_sid, + sksec->sclass, + recv_perm, + ad); + if (rc == 0) + return 0; + + netlbl_skbuff_err(skb, rc); + 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 sk_security_struct *sksec = sock->sk->sk_security; + struct netlbl_lsm_secattr secattr; + + rcu_read_lock(); + if (level == IPPROTO_IP && optname == IP_OPTIONS && + sksec->nlbl_state == NLBL_LABELED) { + netlbl_secattr_init(&secattr); + rc = netlbl_socket_getattr(sock, &secattr); + if (rc == 0 && secattr.flags != NETLBL_SECATTR_NONE) + rc = -EACCES; + netlbl_secattr_destroy(&secattr); + } + rcu_read_unlock(); + + return rc; +} diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c index 1e52356664d..c8913c5dbe2 100644 --- a/security/selinux/ss/services.c +++ b/security/selinux/ss/services.c @@ -2226,13 +2226,13 @@ void security_skb_extlbl_sid(struct sk_buff *skb, u32 base_sid, u32 *sid) #ifdef CONFIG_NETLABEL /* - * This is the structure we store inside the NetLabel cache block. + * NetLabel cache structure */ -#define NETLBL_CACHE(x) ((struct netlbl_cache *)(x)) +#define NETLBL_CACHE(x) ((struct selinux_netlbl_cache *)(x)) #define NETLBL_CACHE_T_NONE 0 #define NETLBL_CACHE_T_SID 1 #define NETLBL_CACHE_T_MLS 2 -struct netlbl_cache { +struct selinux_netlbl_cache { u32 type; union { u32 sid; @@ -2241,7 +2241,7 @@ struct netlbl_cache { }; /** - * selinux_netlbl_cache_free - Free the NetLabel cached data + * security_netlbl_cache_free - Free the NetLabel cached data * @data: the data to free * * Description: @@ -2249,9 +2249,9 @@ struct netlbl_cache { * netlbl_lsm_cache structure. * */ -static void selinux_netlbl_cache_free(const void *data) +static void security_netlbl_cache_free(const void *data) { - struct netlbl_cache *cache; + struct selinux_netlbl_cache *cache; if (data == NULL) return; @@ -2266,33 +2266,33 @@ static void selinux_netlbl_cache_free(const void *data) } /** - * selinux_netlbl_cache_add - Add an entry to the NetLabel cache - * @skb: the packet + * security_netlbl_cache_add - Add an entry to the NetLabel cache + * @secattr: the NetLabel packet security attributes * @ctx: the SELinux context * * Description: * Attempt to cache the context in @ctx, which was derived from the packet in - * @skb, in the NetLabel subsystem cache. + * @skb, in the NetLabel subsystem cache. This function assumes @secattr has + * already been initialized. * */ -static void selinux_netlbl_cache_add(struct sk_buff *skb, struct context *ctx) +static void security_netlbl_cache_add(struct netlbl_lsm_secattr *secattr, + struct context *ctx) { - struct netlbl_cache *cache = NULL; - struct netlbl_lsm_secattr secattr; + struct selinux_netlbl_cache *cache = NULL; - netlbl_secattr_init(&secattr); - secattr.cache = netlbl_secattr_cache_alloc(GFP_ATOMIC); - if (secattr.cache == NULL) - goto netlbl_cache_add_return; + secattr->cache = netlbl_secattr_cache_alloc(GFP_ATOMIC); + if (secattr->cache == NULL) + return; cache = kzalloc(sizeof(*cache), GFP_ATOMIC); if (cache == NULL) - goto netlbl_cache_add_return; + return; cache->type = NETLBL_CACHE_T_MLS; if (ebitmap_cpy(&cache->data.mls_label.level[0].cat, &ctx->range.level[0].cat) != 0) - goto netlbl_cache_add_return; + return; cache->data.mls_label.level[1].cat.highbit = cache->data.mls_label.level[0].cat.highbit; cache->data.mls_label.level[1].cat.node = @@ -2300,52 +2300,40 @@ static void selinux_netlbl_cache_add(struct sk_buff *skb, struct context *ctx) cache->data.mls_label.level[0].sens = ctx->range.level[0].sens; cache->data.mls_label.level[1].sens = ctx->range.level[0].sens; - secattr.cache->free = selinux_netlbl_cache_free; - secattr.cache->data = (void *)cache; - secattr.flags = NETLBL_SECATTR_CACHE; - - netlbl_cache_add(skb, &secattr); - -netlbl_cache_add_return: - netlbl_secattr_destroy(&secattr); + secattr->cache->free = security_netlbl_cache_free; + secattr->cache->data = (void *)cache; + secattr->flags |= NETLBL_SECATTR_CACHE; } /** - * 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_secattr_to_sid - Convert a NetLabel secattr to a SELinux SID - * @skb: the network packet + * security_netlbl_secattr_to_sid - Convert a NetLabel secattr to a SELinux SID * @secattr: the NetLabel packet security attributes * @base_sid: the SELinux SID to use as a context for MLS only attributes * @sid: the SELinux SID * * Description: - * Convert the given NetLabel packet security attributes in @secattr into a + * Convert the given NetLabel security attributes in @secattr into a * SELinux SID. If the @secattr field does not contain a full SELinux - * SID/context then use the context in @base_sid as the foundation. If @skb - * is not NULL attempt to cache as much data as possibile. Returns zero on - * success, negative values on failure. + * SID/context then use the context in @base_sid as the foundation. If + * possibile the 'cache' field of @secattr is set and the CACHE flag is set; + * this is to allow the @secattr to be used by NetLabel to cache the secattr to + * SID conversion for future lookups. Returns zero on success, negative + * values on failure. * */ -static int selinux_netlbl_secattr_to_sid(struct sk_buff *skb, - struct netlbl_lsm_secattr *secattr, - u32 base_sid, - u32 *sid) +int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr, + u32 base_sid, + u32 *sid) { int rc = -EIDRM; struct context *ctx; struct context ctx_new; - struct netlbl_cache *cache; + struct selinux_netlbl_cache *cache; + + if (!ss_initialized) { + *sid = SECSID_NULL; + return 0; + } POLICY_RDLOCK; @@ -2410,8 +2398,8 @@ static int selinux_netlbl_secattr_to_sid(struct sk_buff *skb, if (rc != 0) goto netlbl_secattr_to_sid_return_cleanup; - if (skb != NULL) - selinux_netlbl_cache_add(skb, &ctx_new); + security_netlbl_cache_add(secattr, &ctx_new); + ebitmap_destroy(&ctx_new.range.level[0].cat); } else { *sid = SECSID_NULL; @@ -2427,338 +2415,43 @@ netlbl_secattr_to_sid_return_cleanup: } /** - * selinux_netlbl_skbuff_getsid - Get the sid of a packet using NetLabel - * @skb: the packet - * @base_sid: the SELinux SID to use as a context for MLS only attributes - * @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, u32 base_sid, u32 *sid) -{ - int rc; - struct netlbl_lsm_secattr secattr; - - netlbl_secattr_init(&secattr); - rc = netlbl_skbuff_getattr(skb, &secattr); - if (rc == 0 && secattr.flags != NETLBL_SECATTR_NONE) - rc = selinux_netlbl_secattr_to_sid(skb, - &secattr, - base_sid, - sid); - else - *sid = SECSID_NULL; - netlbl_secattr_destroy(&secattr); - - return rc; -} - -/** - * selinux_netlbl_socket_setsid - Label a socket using the NetLabel mechanism - * @sock: the socket to label - * @sid: the SID to use + * security_netlbl_sid_to_secattr - Convert a SELinux SID to a NetLabel secattr + * @sid: the SELinux SID + * @secattr: the NetLabel packet security attributes * * Description: - * Attempt to label a socket using the NetLabel mechanism using the given - * SID. Returns zero values on success, negative values on failure. The - * caller is responsibile for calling rcu_read_lock() before calling this - * this function and rcu_read_unlock() after this function returns. + * Convert the given SELinux SID in @sid into a NetLabel security attribute. + * Returns zero on success, negative values on failure. * */ -static int selinux_netlbl_socket_setsid(struct socket *sock, u32 sid) +int security_netlbl_sid_to_secattr(u32 sid, struct netlbl_lsm_secattr *secattr) { int rc = -ENOENT; - struct sk_security_struct *sksec = sock->sk->sk_security; - struct netlbl_lsm_secattr secattr; struct context *ctx; + netlbl_secattr_init(secattr); + if (!ss_initialized) return 0; - netlbl_secattr_init(&secattr); - POLICY_RDLOCK; - ctx = sidtab_search(&sidtab, sid); if (ctx == NULL) - goto netlbl_socket_setsid_return; - - secattr.domain = kstrdup(policydb.p_type_val_to_name[ctx->type - 1], - GFP_ATOMIC); - secattr.flags |= NETLBL_SECATTR_DOMAIN; - mls_export_netlbl_lvl(ctx, &secattr); - rc = mls_export_netlbl_cat(ctx, &secattr); + goto netlbl_sid_to_secattr_failure; + secattr->domain = kstrdup(policydb.p_type_val_to_name[ctx->type - 1], + GFP_ATOMIC); + secattr->flags |= NETLBL_SECATTR_DOMAIN; + mls_export_netlbl_lvl(ctx, secattr); + rc = mls_export_netlbl_cat(ctx, secattr); if (rc != 0) - goto netlbl_socket_setsid_return; - - rc = netlbl_socket_setattr(sock, &secattr); - if (rc == 0) { - spin_lock_bh(&sksec->nlbl_lock); - sksec->nlbl_state = NLBL_LABELED; - spin_unlock_bh(&sksec->nlbl_lock); - } - -netlbl_socket_setsid_return: + goto netlbl_sid_to_secattr_failure; POLICY_RDUNLOCK; - netlbl_secattr_destroy(&secattr); - return rc; -} - -/** - * selinux_netlbl_sk_security_reset - Reset the NetLabel fields - * @ssec: 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 responsibile for all the NetLabel sk_security_struct locking. - * - */ -void selinux_netlbl_sk_security_reset(struct sk_security_struct *ssec, - int family) -{ - if (family == PF_INET) - ssec->nlbl_state = NLBL_REQUIRE; - else - ssec->nlbl_state = NLBL_UNSET; -} - -/** - * selinux_netlbl_sk_security_init - Setup the NetLabel fields - * @ssec: the sk_security_struct - * @family: the socket family - * - * Description: - * Called when a new sk_security_struct is allocated to initialize the NetLabel - * fields. - * - */ -void selinux_netlbl_sk_security_init(struct sk_security_struct *ssec, - int family) -{ - /* No locking needed, we are the only one who has access to ssec */ - selinux_netlbl_sk_security_reset(ssec, family); - spin_lock_init(&ssec->nlbl_lock); -} -/** - * selinux_netlbl_sk_security_clone - Copy the NetLabel fields - * @ssec: the original sk_security_struct - * @newssec: the cloned sk_security_struct - * - * Description: - * Clone the NetLabel specific sk_security_struct fields from @ssec to - * @newssec. - * - */ -void selinux_netlbl_sk_security_clone(struct sk_security_struct *ssec, - struct sk_security_struct *newssec) -{ - /* We don't need to take newssec->nlbl_lock because we are the only - * thread with access to newssec, but we do need to take the RCU read - * lock as other threads could have access to ssec */ - rcu_read_lock(); - selinux_netlbl_sk_security_reset(newssec, ssec->sk->sk_family); - newssec->sclass = ssec->sclass; - rcu_read_unlock(); -} - -/** - * selinux_netlbl_socket_post_create - Label a socket using NetLabel - * @sock: the socket to label - * - * 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 socket *sock) -{ - int rc = 0; - struct inode_security_struct *isec = SOCK_INODE(sock)->i_security; - struct sk_security_struct *sksec = sock->sk->sk_security; - - sksec->sclass = isec->sclass; - - rcu_read_lock(); - if (sksec->nlbl_state == NLBL_REQUIRE) - rc = selinux_netlbl_socket_setsid(sock, sksec->sid); - rcu_read_unlock(); - - return rc; -} - -/** - * selinux_netlbl_sock_graft - Netlabel the new socket - * @sk: the new connection - * @sock: the new socket - * - * Description: - * The connection represented by @sk is being grafted onto @sock so set the - * socket's NetLabel to match the SID of @sk. - * - */ -void selinux_netlbl_sock_graft(struct sock *sk, struct socket *sock) -{ - struct inode_security_struct *isec = SOCK_INODE(sock)->i_security; - struct sk_security_struct *sksec = sk->sk_security; - struct netlbl_lsm_secattr secattr; - u32 nlbl_peer_sid; - - sksec->sclass = isec->sclass; - - rcu_read_lock(); - - if (sksec->nlbl_state != NLBL_REQUIRE) { - rcu_read_unlock(); - return; - } - - netlbl_secattr_init(&secattr); - if (netlbl_sock_getattr(sk, &secattr) == 0 && - secattr.flags != NETLBL_SECATTR_NONE && - selinux_netlbl_secattr_to_sid(NULL, - &secattr, - SECINITSID_UNLABELED, - &nlbl_peer_sid) == 0) - sksec->peer_sid = nlbl_peer_sid; - netlbl_secattr_destroy(&secattr); - - /* Try to set the NetLabel on the socket to save time later, if we fail - * here we will pick up the pieces in later calls to - * selinux_netlbl_inode_permission(). */ - selinux_netlbl_socket_setsid(sock, sksec->sid); - - rcu_read_unlock(); -} - -/** - * selinux_netlbl_inode_permission - Verify the socket is NetLabel labeled - * @inode: the file descriptor's inode - * @mask: the permission mask - * - * Description: - * Looks at a file's inode and if it is marked as a socket protected by - * NetLabel then verify that the socket has been labeled, if not try to label - * the socket now with the inode's SID. Returns zero on success, negative - * values on failure. - * - */ -int selinux_netlbl_inode_permission(struct inode *inode, int mask) -{ - int rc; - struct sk_security_struct *sksec; - struct socket *sock; - - if (!S_ISSOCK(inode->i_mode) || - ((mask & (MAY_WRITE | MAY_APPEND)) == 0)) - return 0; - sock = SOCKET_I(inode); - sksec = sock->sk->sk_security; - - rcu_read_lock(); - if (sksec->nlbl_state != NLBL_REQUIRE) { - rcu_read_unlock(); - return 0; - } - local_bh_disable(); - bh_lock_sock_nested(sock->sk); - rc = selinux_netlbl_socket_setsid(sock, sksec->sid); - bh_unlock_sock(sock->sk); - local_bh_enable(); - rcu_read_unlock(); - - return rc; -} - -/** - * selinux_netlbl_sock_rcv_skb - Do an inbound access check using NetLabel - * @sksec: the sock's sk_security_struct - * @skb: the packet - * @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, - struct avc_audit_data *ad) -{ - int rc; - u32 netlbl_sid; - u32 recv_perm; - - rc = selinux_netlbl_skbuff_getsid(skb, - SECINITSID_UNLABELED, - &netlbl_sid); - if (rc != 0) - return rc; - - if (netlbl_sid == SECSID_NULL) - return 0; - - switch (sksec->sclass) { - case SECCLASS_UDP_SOCKET: - recv_perm = UDP_SOCKET__RECVFROM; - break; - case SECCLASS_TCP_SOCKET: - recv_perm = TCP_SOCKET__RECVFROM; - break; - default: - recv_perm = RAWIP_SOCKET__RECVFROM; - } - - rc = avc_has_perm(sksec->sid, - netlbl_sid, - sksec->sclass, - recv_perm, - ad); - if (rc == 0) - return 0; - - netlbl_skbuff_err(skb, rc); - 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 sk_security_struct *sksec = sock->sk->sk_security; - struct netlbl_lsm_secattr secattr; - - rcu_read_lock(); - if (level == IPPROTO_IP && optname == IP_OPTIONS && - sksec->nlbl_state == NLBL_LABELED) { - netlbl_secattr_init(&secattr); - rc = netlbl_socket_getattr(sock, &secattr); - if (rc == 0 && secattr.flags != NETLBL_SECATTR_NONE) - rc = -EACCES; - netlbl_secattr_destroy(&secattr); - } - rcu_read_unlock(); + return 0; +netlbl_sid_to_secattr_failure: + POLICY_RDUNLOCK; + netlbl_secattr_destroy(secattr); return rc; } #endif /* CONFIG_NETLABEL */ |