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path: root/security/selinux/netlabel.c
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Diffstat (limited to 'security/selinux/netlabel.c')
-rw-r--r--security/selinux/netlabel.c85
1 files changed, 49 insertions, 36 deletions
diff --git a/security/selinux/netlabel.c b/security/selinux/netlabel.c
index bf8750791dd1..051b14c88e2d 100644
--- a/security/selinux/netlabel.c
+++ b/security/selinux/netlabel.c
@@ -36,8 +36,8 @@
#include "security.h"
/**
- * selinux_netlbl_socket_setsid - Label a socket using the NetLabel mechanism
- * @sock: the socket to label
+ * selinux_netlbl_sock_setsid - Label a socket using the NetLabel mechanism
+ * @sk: the socket to label
* @sid: the SID to use
*
* Description:
@@ -47,17 +47,17 @@
* this function and rcu_read_unlock() after this function returns.
*
*/
-static int selinux_netlbl_socket_setsid(struct socket *sock, u32 sid)
+static int selinux_netlbl_sock_setsid(struct sock *sk, u32 sid)
{
int rc;
- struct sk_security_struct *sksec = sock->sk->sk_security;
+ struct sk_security_struct *sksec = 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);
+ rc = netlbl_sock_setattr(sk, &secattr);
if (rc == 0) {
spin_lock_bh(&sksec->nlbl_lock);
sksec->nlbl_state = NLBL_LABELED;
@@ -155,12 +155,15 @@ int selinux_netlbl_skbuff_getsid(struct sk_buff *skb, u32 base_sid, 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, &secattr);
if (rc == 0 && secattr.flags != NETLBL_SECATTR_NONE)
- rc = security_netlbl_secattr_to_sid(&secattr,
- base_sid,
- sid);
+ rc = security_netlbl_secattr_to_sid(&secattr, base_sid, sid);
else
*sid = SECSID_NULL;
netlbl_secattr_destroy(&secattr);
@@ -198,7 +201,7 @@ void selinux_netlbl_sock_graft(struct sock *sk, struct socket *sock)
if (netlbl_sock_getattr(sk, &secattr) == 0 &&
secattr.flags != NETLBL_SECATTR_NONE &&
security_netlbl_secattr_to_sid(&secattr,
- SECINITSID_UNLABELED,
+ SECINITSID_NETMSG,
&nlbl_peer_sid) == 0)
sksec->peer_sid = nlbl_peer_sid;
netlbl_secattr_destroy(&secattr);
@@ -206,7 +209,7 @@ void selinux_netlbl_sock_graft(struct sock *sk, struct socket *sock)
/* 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);
+ selinux_netlbl_sock_setsid(sk, sksec->sid);
rcu_read_unlock();
}
@@ -223,14 +226,15 @@ void selinux_netlbl_sock_graft(struct sock *sk, struct socket *sock)
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 = sock->sk->sk_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_socket_setsid(sock, sksec->sid);
+ rc = selinux_netlbl_sock_setsid(sk, sksec->sid);
rcu_read_unlock();
return rc;
@@ -251,14 +255,16 @@ int selinux_netlbl_socket_post_create(struct socket *sock)
int selinux_netlbl_inode_permission(struct inode *inode, int mask)
{
int rc;
- struct sk_security_struct *sksec;
+ struct sock *sk;
struct socket *sock;
+ struct sk_security_struct *sksec;
if (!S_ISSOCK(inode->i_mode) ||
((mask & (MAY_WRITE | MAY_APPEND)) == 0))
return 0;
sock = SOCKET_I(inode);
- sksec = sock->sk->sk_security;
+ sk = sock->sk;
+ sksec = sk->sk_security;
rcu_read_lock();
if (sksec->nlbl_state != NLBL_REQUIRE) {
@@ -266,9 +272,9 @@ int selinux_netlbl_inode_permission(struct inode *inode, int mask)
return 0;
}
local_bh_disable();
- bh_lock_sock_nested(sock->sk);
- rc = selinux_netlbl_socket_setsid(sock, sksec->sid);
- bh_unlock_sock(sock->sk);
+ bh_lock_sock_nested(sk);
+ rc = selinux_netlbl_sock_setsid(sk, sksec->sid);
+ bh_unlock_sock(sk);
local_bh_enable();
rcu_read_unlock();
@@ -292,38 +298,42 @@ int selinux_netlbl_sock_rcv_skb(struct sk_security_struct *sksec,
struct avc_audit_data *ad)
{
int rc;
- u32 netlbl_sid;
- u32 recv_perm;
+ u32 nlbl_sid;
+ u32 perm;
+ struct netlbl_lsm_secattr secattr;
- rc = selinux_netlbl_skbuff_getsid(skb,
- SECINITSID_UNLABELED,
- &netlbl_sid);
+ if (!netlbl_enabled())
+ 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);
+ else
+ nlbl_sid = SECINITSID_UNLABELED;
+ netlbl_secattr_destroy(&secattr);
if (rc != 0)
return rc;
- if (netlbl_sid == SECSID_NULL)
- return 0;
-
switch (sksec->sclass) {
case SECCLASS_UDP_SOCKET:
- recv_perm = UDP_SOCKET__RECVFROM;
+ perm = UDP_SOCKET__RECVFROM;
break;
case SECCLASS_TCP_SOCKET:
- recv_perm = TCP_SOCKET__RECVFROM;
+ perm = TCP_SOCKET__RECVFROM;
break;
default:
- recv_perm = RAWIP_SOCKET__RECVFROM;
+ perm = RAWIP_SOCKET__RECVFROM;
}
- rc = avc_has_perm(sksec->sid,
- netlbl_sid,
- sksec->sclass,
- recv_perm,
- ad);
+ rc = avc_has_perm(sksec->sid, nlbl_sid, sksec->sclass, perm, ad);
if (rc == 0)
return 0;
- netlbl_skbuff_err(skb, rc);
+ if (nlbl_sid != SECINITSID_UNLABELED)
+ netlbl_skbuff_err(skb, rc);
return rc;
}
@@ -345,14 +355,17 @@ int selinux_netlbl_socket_setsockopt(struct socket *sock,
int optname)
{
int rc = 0;
- struct sk_security_struct *sksec = sock->sk->sk_security;
+ struct sock *sk = sock->sk;
+ struct sk_security_struct *sksec = 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);
+ lock_sock(sk);
+ rc = netlbl_sock_getattr(sk, &secattr);
+ release_sock(sk);
if (rc == 0 && secattr.flags != NETLBL_SECATTR_NONE)
rc = -EACCES;
netlbl_secattr_destroy(&secattr);
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-02 20:24:14 +0000