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-rw-r--r--security/selinux/hooks.c50
-rw-r--r--security/selinux/include/netlabel.h9
-rw-r--r--security/selinux/include/objsec.h1
-rw-r--r--security/selinux/netlabel.c68
4 files changed, 125 insertions, 3 deletions
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index a91146a6b37..7432bdd5d36 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -4407,13 +4407,15 @@ static unsigned int selinux_ip_forward(struct sk_buff *skb, int ifindex,
u32 peer_sid;
struct avc_audit_data ad;
u8 secmark_active;
+ u8 netlbl_active;
u8 peerlbl_active;
if (!selinux_policycap_netpeer)
return NF_ACCEPT;
secmark_active = selinux_secmark_enabled();
- peerlbl_active = netlbl_enabled() || selinux_xfrm_enabled();
+ netlbl_active = netlbl_enabled();
+ peerlbl_active = netlbl_active || selinux_xfrm_enabled();
if (!secmark_active && !peerlbl_active)
return NF_ACCEPT;
@@ -4440,6 +4442,14 @@ static unsigned int selinux_ip_forward(struct sk_buff *skb, int ifindex,
SECCLASS_PACKET, PACKET__FORWARD_IN, &ad))
return NF_DROP;
+ if (netlbl_active)
+ /* we do this in the FORWARD path and not the POST_ROUTING
+ * path because we want to make sure we apply the necessary
+ * labeling before IPsec is applied so we can leverage AH
+ * protection */
+ if (selinux_netlbl_skbuff_setsid(skb, family, peer_sid) != 0)
+ return NF_DROP;
+
return NF_ACCEPT;
}
@@ -4463,6 +4473,37 @@ static unsigned int selinux_ipv6_forward(unsigned int hooknum,
}
#endif /* IPV6 */
+static unsigned int selinux_ip_output(struct sk_buff *skb,
+ u16 family)
+{
+ u32 sid;
+
+ if (!netlbl_enabled())
+ return NF_ACCEPT;
+
+ /* we do this in the LOCAL_OUT path and not the POST_ROUTING path
+ * because we want to make sure we apply the necessary labeling
+ * before IPsec is applied so we can leverage AH protection */
+ if (skb->sk) {
+ struct sk_security_struct *sksec = skb->sk->sk_security;
+ sid = sksec->sid;
+ } else
+ sid = SECINITSID_KERNEL;
+ if (selinux_netlbl_skbuff_setsid(skb, family, sid) != 0)
+ return NF_DROP;
+
+ return NF_ACCEPT;
+}
+
+static unsigned int selinux_ipv4_output(unsigned int hooknum,
+ struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ int (*okfn)(struct sk_buff *))
+{
+ return selinux_ip_output(skb, PF_INET);
+}
+
static int selinux_ip_postroute_iptables_compat(struct sock *sk,
int ifindex,
struct avc_audit_data *ad,
@@ -5700,6 +5741,13 @@ static struct nf_hook_ops selinux_ipv4_ops[] = {
.pf = PF_INET,
.hooknum = NF_INET_FORWARD,
.priority = NF_IP_PRI_SELINUX_FIRST,
+ },
+ {
+ .hook = selinux_ipv4_output,
+ .owner = THIS_MODULE,
+ .pf = PF_INET,
+ .hooknum = NF_INET_LOCAL_OUT,
+ .priority = NF_IP_PRI_SELINUX_FIRST,
}
};
diff --git a/security/selinux/include/netlabel.h b/security/selinux/include/netlabel.h
index d4e3ac8a7fb..b3e6ae071fc 100644
--- a/security/selinux/include/netlabel.h
+++ b/security/selinux/include/netlabel.h
@@ -48,6 +48,9 @@ int selinux_netlbl_skbuff_getsid(struct sk_buff *skb,
u16 family,
u32 *type,
u32 *sid);
+int selinux_netlbl_skbuff_setsid(struct sk_buff *skb,
+ u16 family,
+ u32 sid);
void selinux_netlbl_sock_graft(struct sock *sk, struct socket *sock);
int selinux_netlbl_socket_post_create(struct socket *sock);
@@ -88,6 +91,12 @@ static inline int selinux_netlbl_skbuff_getsid(struct sk_buff *skb,
*sid = SECSID_NULL;
return 0;
}
+static inline int selinux_netlbl_skbuff_setsid(struct sk_buff *skb,
+ u16 family,
+ u32 sid)
+{
+ return 0;
+}
static inline void selinux_netlbl_sock_graft(struct sock *sk,
struct socket *sock)
diff --git a/security/selinux/include/objsec.h b/security/selinux/include/objsec.h
index 91070ab874c..f46dd1c3d01 100644
--- a/security/selinux/include/objsec.h
+++ b/security/selinux/include/objsec.h
@@ -117,6 +117,7 @@ struct sk_security_struct {
NLBL_UNSET = 0,
NLBL_REQUIRE,
NLBL_LABELED,
+ NLBL_REQSKB,
} nlbl_state;
#endif
};
diff --git a/security/selinux/netlabel.c b/security/selinux/netlabel.c
index 4053f7fc95f..090404d6e51 100644
--- a/security/selinux/netlabel.c
+++ b/security/selinux/netlabel.c
@@ -9,7 +9,7 @@
*/
/*
- * (c) Copyright Hewlett-Packard Development Company, L.P., 2007
+ * (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
@@ -31,6 +31,8 @@
#include <linux/rcupdate.h>
#include <net/sock.h>
#include <net/netlabel.h>
+#include <net/inet_sock.h>
+#include <net/inet_connection_sock.h>
#include "objsec.h"
#include "security.h"
@@ -77,6 +79,8 @@ 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 inet_sock *sk_inet;
+ struct inet_connection_sock *sk_conn;
if (sksec->nlbl_state != NLBL_REQUIRE)
return 0;
@@ -87,8 +91,29 @@ static int selinux_netlbl_sock_setsid(struct sock *sk)
if (rc != 0)
goto sock_setsid_return;
rc = netlbl_sock_setattr(sk, &secattr);
- if (rc == 0)
+ switch (rc) {
+ case 0:
sksec->nlbl_state = NLBL_LABELED;
+ break;
+ case -EDESTADDRREQ:
+ /* we are going to possibly end up labeling the individual
+ * packets later which is problematic for stream sockets
+ * because of the additional IP header size, our solution is to
+ * allow for the maximum IP header length (40 bytes for IPv4,
+ * we don't have to worry about IPv6 yet) just in case */
+ sk_inet = inet_sk(sk);
+ if (sk_inet->is_icsk) {
+ sk_conn = inet_csk(sk);
+ if (sk_inet->opt)
+ sk_conn->icsk_ext_hdr_len -=
+ sk_inet->opt->optlen;
+ sk_conn->icsk_ext_hdr_len += 40;
+ sk_conn->icsk_sync_mss(sk, sk_conn->icsk_pmtu_cookie);
+ }
+ sksec->nlbl_state = NLBL_REQSKB;
+ rc = 0;
+ break;
+ }
sock_setsid_return:
netlbl_secattr_destroy(&secattr);
@@ -183,6 +208,45 @@ int selinux_netlbl_skbuff_getsid(struct sk_buff *skb,
}
/**
+ * 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 auccess, negative values on failure.
+ *
+ */
+int selinux_netlbl_skbuff_setsid(struct sk_buff *skb,
+ u16 family,
+ u32 sid)
+{
+ int rc;
+ struct netlbl_lsm_secattr secattr;
+ 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;
+ }
+
+ 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:
+ netlbl_secattr_destroy(&secattr);
+ return rc;
+}
+
+/**
* selinux_netlbl_sock_graft - Netlabel the new socket
* @sk: the new connection
* @sock: the new socket
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-20 02:36:41 +0000