diff options
Diffstat (limited to 'security/selinux/netlabel.c')
| -rw-r--r-- | security/selinux/netlabel.c | 115 |
1 files changed, 79 insertions, 36 deletions
diff --git a/security/selinux/netlabel.c b/security/selinux/netlabel.c index b22b7dafa0e3..f58701a7b728 100644 --- a/security/selinux/netlabel.c +++ b/security/selinux/netlabel.c @@ -68,6 +68,38 @@ static int selinux_netlbl_sidlookup_cached(struct sk_buff *skb, } /** + * 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_sock_setsid - Label a socket using the NetLabel mechanism * @sk: the socket to label * @@ -80,17 +112,15 @@ static int selinux_netlbl_sock_setsid(struct sock *sk) { int rc; struct sk_security_struct *sksec = sk->sk_security; - struct netlbl_lsm_secattr secattr; + struct netlbl_lsm_secattr *secattr; if (sksec->nlbl_state != NLBL_REQUIRE) return 0; - netlbl_secattr_init(&secattr); - - rc = security_netlbl_sid_to_secattr(sksec->sid, &secattr); - if (rc != 0) - goto sock_setsid_return; - rc = netlbl_sock_setattr(sk, &secattr); + secattr = selinux_netlbl_sock_genattr(sk); + if (secattr == NULL) + return -ENOMEM; + rc = netlbl_sock_setattr(sk, secattr); switch (rc) { case 0: sksec->nlbl_state = NLBL_LABELED; @@ -101,8 +131,6 @@ static int selinux_netlbl_sock_setsid(struct sock *sk) break; } -sock_setsid_return: - netlbl_secattr_destroy(&secattr); return rc; } @@ -137,6 +165,20 @@ void selinux_netlbl_err(struct sk_buff *skb, int error, int gateway) } /** + * selinux_netlbl_sk_security_free - Free the NetLabel fields + * @sssec: 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 *ssec) +{ + if (ssec->nlbl_secattr != NULL) + netlbl_secattr_free(ssec->nlbl_secattr); +} + +/** * selinux_netlbl_sk_security_reset - Reset the NetLabel fields * @ssec: the sk_security_struct * @family: the socket family @@ -209,7 +251,8 @@ int selinux_netlbl_skbuff_setsid(struct sk_buff *skb, u32 sid) { int rc; - struct netlbl_lsm_secattr secattr; + 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 @@ -219,16 +262,21 @@ int selinux_netlbl_skbuff_setsid(struct sk_buff *skb, 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; } - 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); + rc = netlbl_skbuff_setattr(skb, family, secattr); skbuff_setsid_return: - netlbl_secattr_destroy(&secattr); + if (secattr == &secattr_storage) + netlbl_secattr_destroy(secattr); return rc; } @@ -245,18 +293,18 @@ void selinux_netlbl_inet_conn_established(struct sock *sk, u16 family) { int rc; struct sk_security_struct *sksec = sk->sk_security; - struct netlbl_lsm_secattr secattr; + struct netlbl_lsm_secattr *secattr; struct inet_sock *sk_inet = inet_sk(sk); struct sockaddr_in addr; if (sksec->nlbl_state != NLBL_REQUIRE) return; - netlbl_secattr_init(&secattr); - if (security_netlbl_sid_to_secattr(sksec->sid, &secattr) != 0) - goto inet_conn_established_return; + secattr = selinux_netlbl_sock_genattr(sk); + if (secattr == NULL) + return; - rc = netlbl_sock_setattr(sk, &secattr); + rc = netlbl_sock_setattr(sk, secattr); switch (rc) { case 0: sksec->nlbl_state = NLBL_LABELED; @@ -266,13 +314,13 @@ void selinux_netlbl_inet_conn_established(struct sock *sk, u16 family) * labeling protocols */ if (family != PF_INET) { sksec->nlbl_state = NLBL_UNSET; - goto inet_conn_established_return; + return; } addr.sin_family = family; addr.sin_addr.s_addr = sk_inet->daddr; if (netlbl_conn_setattr(sk, (struct sockaddr *)&addr, - &secattr) != 0) { + secattr) != 0) { /* we failed to label the connected socket (could be * for a variety of reasons, the actual "why" isn't * important here) so we have to go to our backup plan, @@ -300,10 +348,6 @@ void selinux_netlbl_inet_conn_established(struct sock *sk, u16 family) * return an error code */ break; } - -inet_conn_established_return: - netlbl_secattr_destroy(&secattr); - return; } /** @@ -468,13 +512,12 @@ 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; + struct netlbl_lsm_secattr *secattr; if (sksec->nlbl_state != NLBL_REQSKB && sksec->nlbl_state != NLBL_CONNLABELED) return 0; - netlbl_secattr_init(&secattr); local_bh_disable(); bh_lock_sock_nested(sk); @@ -487,17 +530,17 @@ int selinux_netlbl_socket_connect(struct sock *sk, struct sockaddr *addr) rc = 0; goto socket_connect_return; } - rc = security_netlbl_sid_to_secattr(sksec->sid, &secattr); - if (rc != 0) + 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) - goto socket_connect_return; - sksec->nlbl_state = NLBL_CONNLABELED; + } + 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(); - netlbl_secattr_destroy(&secattr); return rc; } |