diff options
Diffstat (limited to 'security/selinux/netlabel.c')
| -rw-r--r-- | security/selinux/netlabel.c | 82 |
1 files changed, 50 insertions, 32 deletions
diff --git a/security/selinux/netlabel.c b/security/selinux/netlabel.c index d243ddc..0fa2be4 100644 --- a/security/selinux/netlabel.c +++ b/security/selinux/netlabel.c @@ -36,6 +36,33 @@ #include "security.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_setsid - Label a socket using the NetLabel mechanism * @sk: the socket to label * @sid: the SID to use @@ -53,10 +80,11 @@ static int selinux_netlbl_sock_setsid(struct sock *sk, u32 sid) struct sk_security_struct *sksec = sk->sk_security; struct netlbl_lsm_secattr secattr; + netlbl_secattr_init(&secattr); + rc = security_netlbl_sid_to_secattr(sid, &secattr); if (rc != 0) - return rc; - + goto sock_setsid_return; rc = netlbl_sock_setattr(sk, &secattr); if (rc == 0) { spin_lock_bh(&sksec->nlbl_lock); @@ -64,6 +92,8 @@ static int selinux_netlbl_sock_setsid(struct sock *sk, u32 sid) spin_unlock_bh(&sksec->nlbl_lock); } +sock_setsid_return: + netlbl_secattr_destroy(&secattr); return rc; } @@ -134,14 +164,14 @@ void selinux_netlbl_sk_security_clone(struct sk_security_struct *ssec, * 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 + * @family: protocol family + * @type: NetLabel labeling protocol type * @sid: the SID * * Description: @@ -150,7 +180,10 @@ void selinux_netlbl_sk_security_clone(struct sk_security_struct *ssec, * 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 selinux_netlbl_skbuff_getsid(struct sk_buff *skb, + u16 family, + u32 *type, + u32 *sid) { int rc; struct netlbl_lsm_secattr secattr; @@ -161,15 +194,12 @@ int selinux_netlbl_skbuff_getsid(struct sk_buff *skb, u32 base_sid, u32 *sid) } 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); - if (rc == 0 && - (secattr.flags & NETLBL_SECATTR_CACHEABLE) && - (secattr.flags & NETLBL_SECATTR_CACHE)) - netlbl_cache_add(skb, &secattr); - } else + 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; @@ -187,13 +217,10 @@ 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) { - 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) { @@ -204,9 +231,7 @@ void selinux_netlbl_sock_graft(struct sock *sk, struct socket *sock) netlbl_secattr_init(&secattr); if (netlbl_sock_getattr(sk, &secattr) == 0 && secattr.flags != NETLBL_SECATTR_NONE && - security_netlbl_secattr_to_sid(&secattr, - SECINITSID_NETMSG, - &nlbl_peer_sid) == 0) + security_netlbl_secattr_to_sid(&secattr, &nlbl_peer_sid) == 0) sksec->peer_sid = nlbl_peer_sid; netlbl_secattr_destroy(&secattr); @@ -231,11 +256,8 @@ int selinux_netlbl_socket_post_create(struct socket *sock) { int rc = 0; struct sock *sk = sock->sk; - struct inode_security_struct *isec = SOCK_INODE(sock)->i_security; struct sk_security_struct *sksec = sk->sk_security; - sksec->sclass = isec->sclass; - rcu_read_lock(); if (sksec->nlbl_state == NLBL_REQUIRE) rc = selinux_netlbl_sock_setsid(sk, sksec->sid); @@ -289,6 +311,7 @@ int selinux_netlbl_inode_permission(struct inode *inode, int mask) * 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: @@ -299,6 +322,7 @@ 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, + u16 family, struct avc_audit_data *ad) { int rc; @@ -310,16 +334,10 @@ int selinux_netlbl_sock_rcv_skb(struct sk_security_struct *sksec, return 0; 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, - SECINITSID_NETMSG, - &nlbl_sid); - if (rc == 0 && - (secattr.flags & NETLBL_SECATTR_CACHEABLE) && - (secattr.flags & NETLBL_SECATTR_CACHE)) - netlbl_cache_add(skb, &secattr); - } else + 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) |
