Merge branch 'next' of git://git.infradead.org/users/pcmoore/selinux into next

security/selinux/hooks.c

@@ -2097,6 +2097,41 @@ static int selinux_vm_enough_memory(struct mm_struct *mm, long pages)
 
 /* binprm security operations */
 
+static int check_nnp_nosuid(const struct linux_binprm *bprm,
+			    const struct task_security_struct *old_tsec,
+			    const struct task_security_struct *new_tsec)
+{
+	int nnp = (bprm->unsafe & LSM_UNSAFE_NO_NEW_PRIVS);
+	int nosuid = (bprm->file->f_path.mnt->mnt_flags & MNT_NOSUID);
+	int rc;
+
+	if (!nnp && !nosuid)
+		return 0; /* neither NNP nor nosuid */
+
+	if (new_tsec->sid == old_tsec->sid)
+		return 0; /* No change in credentials */
+
+	/*
+	 * The only transitions we permit under NNP or nosuid
+	 * are transitions to bounded SIDs, i.e. SIDs that are
+	 * guaranteed to only be allowed a subset of the permissions
+	 * of the current SID.
+	 */
+	rc = security_bounded_transition(old_tsec->sid, new_tsec->sid);
+	if (rc) {
+		/*
+		 * On failure, preserve the errno values for NNP vs nosuid.
+		 * NNP:  Operation not permitted for caller.
+		 * nosuid:  Permission denied to file.
+		 */
+		if (nnp)
+			return -EPERM;
+		else
+			return -EACCES;
+	}
+	return 0;
+}
+
 static int selinux_bprm_set_creds(struct linux_binprm *bprm)
 {
 	const struct task_security_struct *old_tsec;
@@ -2133,14 +2168,10 @@ static int selinux_bprm_set_creds(struct linux_binprm *bprm)
 		/* Reset exec SID on execve. */
 		new_tsec->exec_sid = 0;
 
-		/*
-		 * Minimize confusion: if no_new_privs or nosuid and a
-		 * transition is explicitly requested, then fail the exec.
-		 */
-		if (bprm->unsafe & LSM_UNSAFE_NO_NEW_PRIVS)
-			return -EPERM;
-		if (bprm->file->f_path.mnt->mnt_flags & MNT_NOSUID)
-			return -EACCES;
+		/* Fail on NNP or nosuid if not an allowed transition. */
+		rc = check_nnp_nosuid(bprm, old_tsec, new_tsec);
+		if (rc)
+			return rc;
 	} else {
 		/* Check for a default transition on this program. */
 		rc = security_transition_sid(old_tsec->sid, isec->sid,
@@ -2148,15 +2179,19 @@ static int selinux_bprm_set_creds(struct linux_binprm *bprm)
 					     &new_tsec->sid);
 		if (rc)
 			return rc;
+
+		/*
+		 * Fallback to old SID on NNP or nosuid if not an allowed
+		 * transition.
+		 */
+		rc = check_nnp_nosuid(bprm, old_tsec, new_tsec);
+		if (rc)
+			new_tsec->sid = old_tsec->sid;
 	}
 
 	ad.type = LSM_AUDIT_DATA_PATH;
 	ad.u.path = bprm->file->f_path;
 
-	if ((bprm->file->f_path.mnt->mnt_flags & MNT_NOSUID) ||
-	    (bprm->unsafe & LSM_UNSAFE_NO_NEW_PRIVS))
-		new_tsec->sid = old_tsec->sid;
-
 	if (new_tsec->sid == old_tsec->sid) {
 		rc = avc_has_perm(old_tsec->sid, isec->sid,
 				  SECCLASS_FILE, FILE__EXECUTE_NO_TRANS, &ad);
@@ -4272,15 +4307,15 @@ static int selinux_socket_unix_may_send(struct socket *sock,
 			    &ad);
 }
 
-static int selinux_inet_sys_rcv_skb(int ifindex, char *addrp, u16 family,
-				    u32 peer_sid,
+static int selinux_inet_sys_rcv_skb(struct net *ns, int ifindex,
+				    char *addrp, u16 family, u32 peer_sid,
 				    struct common_audit_data *ad)
 {
 	int err;
 	u32 if_sid;
 	u32 node_sid;
 
-	err = sel_netif_sid(ifindex, &if_sid);
+	err = sel_netif_sid(ns, ifindex, &if_sid);
 	if (err)
 		return err;
 	err = avc_has_perm(peer_sid, if_sid,
@@ -4373,8 +4408,8 @@ static int selinux_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
 		err = selinux_skb_peerlbl_sid(skb, family, &peer_sid);
 		if (err)
 			return err;
-		err = selinux_inet_sys_rcv_skb(skb->skb_iif, addrp, family,
-					       peer_sid, &ad);
+		err = selinux_inet_sys_rcv_skb(sock_net(sk), skb->skb_iif,
+					       addrp, family, peer_sid, &ad);
 		if (err) {
 			selinux_netlbl_err(skb, err, 0);
 			return err;
@@ -4692,10 +4727,9 @@ static int selinux_nlmsg_perm(struct sock *sk, struct sk_buff *skb)
 	err = selinux_nlmsg_lookup(sksec->sclass, nlh->nlmsg_type, &perm);
 	if (err) {
 		if (err == -EINVAL) {
-			audit_log(current->audit_context, GFP_KERNEL, AUDIT_SELINUX_ERR,
-				  "SELinux:  unrecognized netlink message"
-				  " type=%hu for sclass=%hu\n",
-				  nlh->nlmsg_type, sksec->sclass);
+			WARN_ONCE(1, "selinux_nlmsg_perm: unrecognized netlink message:"
+				  " protocol=%hu nlmsg_type=%hu sclass=%hu\n",
+				  sk->sk_protocol, nlh->nlmsg_type, sksec->sclass);
 			if (!selinux_enforcing || security_get_allow_unknown())
 				err = 0;
 		}
@@ -4713,7 +4747,8 @@ static int selinux_nlmsg_perm(struct sock *sk, struct sk_buff *skb)
 
 #ifdef CONFIG_NETFILTER
 
-static unsigned int selinux_ip_forward(struct sk_buff *skb, int ifindex,
+static unsigned int selinux_ip_forward(struct sk_buff *skb,
+				       const struct net_device *indev,
 				       u16 family)
 {
 	int err;
@@ -4739,14 +4774,14 @@ static unsigned int selinux_ip_forward(struct sk_buff *skb, int ifindex,
 
 	ad.type = LSM_AUDIT_DATA_NET;
 	ad.u.net = &net;
-	ad.u.net->netif = ifindex;
+	ad.u.net->netif = indev->ifindex;
 	ad.u.net->family = family;
 	if (selinux_parse_skb(skb, &ad, &addrp, 1, NULL) != 0)
 		return NF_DROP;
 
 	if (peerlbl_active) {
-		err = selinux_inet_sys_rcv_skb(ifindex, addrp, family,
-					       peer_sid, &ad);
+		err = selinux_inet_sys_rcv_skb(dev_net(indev), indev->ifindex,
+					       addrp, family, peer_sid, &ad);
 		if (err) {
 			selinux_netlbl_err(skb, err, 1);
 			return NF_DROP;
@@ -4775,7 +4810,7 @@ static unsigned int selinux_ipv4_forward(const struct nf_hook_ops *ops,
 					 const struct net_device *out,
 					 int (*okfn)(struct sk_buff *))
 {
-	return selinux_ip_forward(skb, in->ifindex, PF_INET);
+	return selinux_ip_forward(skb, in, PF_INET);
 }
 
 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
@@ -4785,7 +4820,7 @@ static unsigned int selinux_ipv6_forward(const struct nf_hook_ops *ops,
 					 const struct net_device *out,
 					 int (*okfn)(struct sk_buff *))
 {
-	return selinux_ip_forward(skb, in->ifindex, PF_INET6);
+	return selinux_ip_forward(skb, in, PF_INET6);
 }
 #endif	/* IPV6 */
 
@@ -4873,11 +4908,13 @@ static unsigned int selinux_ip_postroute_compat(struct sk_buff *skb,
 	return NF_ACCEPT;
 }
 
-static unsigned int selinux_ip_postroute(struct sk_buff *skb, int ifindex,
+static unsigned int selinux_ip_postroute(struct sk_buff *skb,
+					 const struct net_device *outdev,
 					 u16 family)
 {
 	u32 secmark_perm;
 	u32 peer_sid;
+	int ifindex = outdev->ifindex;
 	struct sock *sk;
 	struct common_audit_data ad;
 	struct lsm_network_audit net = {0,};
@@ -4958,6 +4995,7 @@ static unsigned int selinux_ip_postroute(struct sk_buff *skb, int ifindex,
 			case PF_INET6:
 				if (IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED)
 					return NF_ACCEPT;
+				break;
 			default:
 				return NF_DROP_ERR(-ECONNREFUSED);
 			}
@@ -4989,7 +5027,7 @@ static unsigned int selinux_ip_postroute(struct sk_buff *skb, int ifindex,
 		u32 if_sid;
 		u32 node_sid;
 
-		if (sel_netif_sid(ifindex, &if_sid))
+		if (sel_netif_sid(dev_net(outdev), ifindex, &if_sid))
 			return NF_DROP;
 		if (avc_has_perm(peer_sid, if_sid,
 				 SECCLASS_NETIF, NETIF__EGRESS, &ad))
@@ -5011,7 +5049,7 @@ static unsigned int selinux_ipv4_postroute(const struct nf_hook_ops *ops,
 					   const struct net_device *out,
 					   int (*okfn)(struct sk_buff *))
 {
-	return selinux_ip_postroute(skb, out->ifindex, PF_INET);
+	return selinux_ip_postroute(skb, out, PF_INET);
 }
 
 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
@@ -5021,7 +5059,7 @@ static unsigned int selinux_ipv6_postroute(const struct nf_hook_ops *ops,
 					   const struct net_device *out,
 					   int (*okfn)(struct sk_buff *))
 {
-	return selinux_ip_postroute(skb, out->ifindex, PF_INET6);
+	return selinux_ip_postroute(skb, out, PF_INET6);
 }
 #endif	/* IPV6 */
 
@@ -6035,7 +6073,7 @@ security_initcall(selinux_init);
 
 #if defined(CONFIG_NETFILTER)
 
-static struct nf_hook_ops selinux_ipv4_ops[] = {
+static struct nf_hook_ops selinux_nf_ops[] = {
 	{
 		.hook =		selinux_ipv4_postroute,
 		.owner =	THIS_MODULE,
@@ -6056,12 +6094,8 @@ static struct nf_hook_ops selinux_ipv4_ops[] = {
 		.pf =		NFPROTO_IPV4,
 		.hooknum =	NF_INET_LOCAL_OUT,
 		.priority =	NF_IP_PRI_SELINUX_FIRST,
-	}
-};
-
+	},
 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
-
-static struct nf_hook_ops selinux_ipv6_ops[] = {
 	{
 		.hook =		selinux_ipv6_postroute,
 		.owner =	THIS_MODULE,
@@ -6075,32 +6109,24 @@ static struct nf_hook_ops selinux_ipv6_ops[] = {
 		.pf =		NFPROTO_IPV6,
 		.hooknum =	NF_INET_FORWARD,
 		.priority =	NF_IP6_PRI_SELINUX_FIRST,
-	}
-};
-
+	},
 #endif	/* IPV6 */
+};
 
 static int __init selinux_nf_ip_init(void)
 {
-	int err = 0;
+	int err;
 
 	if (!selinux_enabled)
-		goto out;
+		return 0;
 
 	printk(KERN_DEBUG "SELinux:  Registering netfilter hooks\n");
 
-	err = nf_register_hooks(selinux_ipv4_ops, ARRAY_SIZE(selinux_ipv4_ops));
+	err = nf_register_hooks(selinux_nf_ops, ARRAY_SIZE(selinux_nf_ops));
 	if (err)
-		panic("SELinux: nf_register_hooks for IPv4: error %d\n", err);
+		panic("SELinux: nf_register_hooks: error %d\n", err);
 
-#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
-	err = nf_register_hooks(selinux_ipv6_ops, ARRAY_SIZE(selinux_ipv6_ops));
-	if (err)
-		panic("SELinux: nf_register_hooks for IPv6: error %d\n", err);
-#endif	/* IPV6 */
-
-out:
-	return err;
+	return 0;
 }
 
 __initcall(selinux_nf_ip_init);
@@ -6110,10 +6136,7 @@ static void selinux_nf_ip_exit(void)
 {
 	printk(KERN_DEBUG "SELinux:  Unregistering netfilter hooks\n");
 
-	nf_unregister_hooks(selinux_ipv4_ops, ARRAY_SIZE(selinux_ipv4_ops));
-#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
-	nf_unregister_hooks(selinux_ipv6_ops, ARRAY_SIZE(selinux_ipv6_ops));
-#endif	/* IPV6 */
+	nf_unregister_hooks(selinux_nf_ops, ARRAY_SIZE(selinux_nf_ops));
 }
 #endif
 

security/selinux/include/netif.h

@@ -17,9 +17,11 @@
 #ifndef _SELINUX_NETIF_H_
 #define _SELINUX_NETIF_H_
 
+#include <net/net_namespace.h>
+
 void sel_netif_flush(void);
 
-int sel_netif_sid(int ifindex, u32 *sid);
+int sel_netif_sid(struct net *ns, int ifindex, u32 *sid);
 
 #endif	/* _SELINUX_NETIF_H_ */
 

security/selinux/include/objsec.h

@@ -24,6 +24,7 @@
 #include <linux/binfmts.h>
 #include <linux/in.h>
 #include <linux/spinlock.h>
+#include <net/net_namespace.h>
 #include "flask.h"
 #include "avc.h"
 
@@ -78,6 +79,7 @@ struct ipc_security_struct {
 };
 
 struct netif_security_struct {
+	struct net *ns;			/* network namespace */
 	int ifindex;			/* device index */
 	u32 sid;			/* SID for this interface */
 };

security/selinux/netif.c

@@ -45,6 +45,7 @@ static struct list_head sel_netif_hash[SEL_NETIF_HASH_SIZE];
 
 /**
  * sel_netif_hashfn - Hashing function for the interface table
+ * @ns: the network namespace
  * @ifindex: the network interface
  *
  * Description:
@@ -52,13 +53,14 @@ static struct list_head sel_netif_hash[SEL_NETIF_HASH_SIZE];
  * bucket number for the given interface.
  *
  */
-static inline u32 sel_netif_hashfn(int ifindex)
+static inline u32 sel_netif_hashfn(const struct net *ns, int ifindex)
 {
-	return (ifindex & (SEL_NETIF_HASH_SIZE - 1));
+	return (((uintptr_t)ns + ifindex) & (SEL_NETIF_HASH_SIZE - 1));
 }
 
 /**
  * sel_netif_find - Search for an interface record
+ * @ns: the network namespace
  * @ifindex: the network interface
  *
  * Description:
@@ -66,15 +68,15 @@ static inline u32 sel_netif_hashfn(int ifindex)
  * If an entry can not be found in the table return NULL.
  *
  */
-static inline struct sel_netif *sel_netif_find(int ifindex)
+static inline struct sel_netif *sel_netif_find(const struct net *ns,
+					       int ifindex)
 {
-	int idx = sel_netif_hashfn(ifindex);
+	int idx = sel_netif_hashfn(ns, ifindex);
 	struct sel_netif *netif;
 
 	list_for_each_entry_rcu(netif, &sel_netif_hash[idx], list)
-		/* all of the devices should normally fit in the hash, so we
-		 * optimize for that case */
-		if (likely(netif->nsec.ifindex == ifindex))
+		if (net_eq(netif->nsec.ns, ns) &&
+		    netif->nsec.ifindex == ifindex)
 			return netif;
 
 	return NULL;
@@ -96,7 +98,7 @@ static int sel_netif_insert(struct sel_netif *netif)
 	if (sel_netif_total >= SEL_NETIF_HASH_MAX)
 		return -ENOSPC;
 
-	idx = sel_netif_hashfn(netif->nsec.ifindex);
+	idx = sel_netif_hashfn(netif->nsec.ns, netif->nsec.ifindex);
 	list_add_rcu(&netif->list, &sel_netif_hash[idx]);
 	sel_netif_total++;
 
@@ -120,6 +122,7 @@ static void sel_netif_destroy(struct sel_netif *netif)
 
 /**
  * sel_netif_sid_slow - Lookup the SID of a network interface using the policy
+ * @ns: the network namespace
  * @ifindex: the network interface
  * @sid: interface SID
  *
@@ -130,7 +133,7 @@ static void sel_netif_destroy(struct sel_netif *netif)
  * failure.
  *
  */
-static int sel_netif_sid_slow(int ifindex, u32 *sid)
+static int sel_netif_sid_slow(struct net *ns, int ifindex, u32 *sid)
 {
 	int ret;
 	struct sel_netif *netif;
@@ -140,7 +143,7 @@ static int sel_netif_sid_slow(int ifindex, u32 *sid)
 	/* NOTE: we always use init's network namespace since we don't
 	 * currently support containers */
 
-	dev = dev_get_by_index(&init_net, ifindex);
+	dev = dev_get_by_index(ns, ifindex);
 	if (unlikely(dev == NULL)) {
 		printk(KERN_WARNING
 		       "SELinux: failure in sel_netif_sid_slow(),"
@@ -149,7 +152,7 @@ static int sel_netif_sid_slow(int ifindex, u32 *sid)
 	}
 
 	spin_lock_bh(&sel_netif_lock);
-	netif = sel_netif_find(ifindex);
+	netif = sel_netif_find(ns, ifindex);
 	if (netif != NULL) {
 		*sid = netif->nsec.sid;
 		ret = 0;
@@ -163,6 +166,7 @@ static int sel_netif_sid_slow(int ifindex, u32 *sid)
 	ret = security_netif_sid(dev->name, &new->nsec.sid);
 	if (ret != 0)
 		goto out;
+	new->nsec.ns = ns;
 	new->nsec.ifindex = ifindex;
 	ret = sel_netif_insert(new);
 	if (ret != 0)
@@ -184,6 +188,7 @@ static int sel_netif_sid_slow(int ifindex, u32 *sid)
 
 /**
  * sel_netif_sid - Lookup the SID of a network interface
+ * @ns: the network namespace
  * @ifindex: the network interface
  * @sid: interface SID
  *
@@ -195,12 +200,12 @@ static int sel_netif_sid_slow(int ifindex, u32 *sid)
  * on failure.
  *
  */
-int sel_netif_sid(int ifindex, u32 *sid)
+int sel_netif_sid(struct net *ns, int ifindex, u32 *sid)
 {
 	struct sel_netif *netif;
 
 	rcu_read_lock();
-	netif = sel_netif_find(ifindex);
+	netif = sel_netif_find(ns, ifindex);
 	if (likely(netif != NULL)) {
 		*sid = netif->nsec.sid;
 		rcu_read_unlock();
@@ -208,11 +213,12 @@ int sel_netif_sid(int ifindex, u32 *sid)
 	}
 	rcu_read_unlock();
 
-	return sel_netif_sid_slow(ifindex, sid);
+	return sel_netif_sid_slow(ns, ifindex, sid);
 }
 
 /**
  * sel_netif_kill - Remove an entry from the network interface table
+ * @ns: the network namespace
  * @ifindex: the network interface
  *
  * Description:
@@ -220,13 +226,13 @@ int sel_netif_sid(int ifindex, u32 *sid)
  * table if it exists.
  *
  */
-static void sel_netif_kill(int ifindex)
+static void sel_netif_kill(const struct net *ns, int ifindex)
 {
 	struct sel_netif *netif;
 
 	rcu_read_lock();
 	spin_lock_bh(&sel_netif_lock);
-	netif = sel_netif_find(ifindex);
+	netif = sel_netif_find(ns, ifindex);
 	if (netif)
 		sel_netif_destroy(netif);
 	spin_unlock_bh(&sel_netif_lock);
@@ -257,11 +263,8 @@ static int sel_netif_netdev_notifier_handler(struct notifier_block *this,
 {
 	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
 
-	if (dev_net(dev) != &init_net)
-		return NOTIFY_DONE;
-
 	if (event == NETDEV_DOWN)
-		sel_netif_kill(dev->ifindex);
+		sel_netif_kill(dev_net(dev), dev->ifindex);
 
 	return NOTIFY_DONE;
 }

security/selinux/ss/services.c

@@ -728,7 +728,7 @@ static int security_validtrans_handle_fail(struct context *ocontext,
 	if (context_struct_to_string(tcontext, &t, &tlen))
 		goto out;
 	audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR,
-		  "security_validate_transition:  denied for"
+		  "op=security_validate_transition seresult=denied"
 		  " oldcontext=%s newcontext=%s taskcontext=%s tclass=%s",
 		  o, n, t, sym_name(&policydb, SYM_CLASSES, tclass-1));
 out:
@@ -877,7 +877,7 @@ int security_bounded_transition(u32 old_sid, u32 new_sid)
 			audit_log(current->audit_context,
 				  GFP_ATOMIC, AUDIT_SELINUX_ERR,
 				  "op=security_bounded_transition "
-				  "result=denied "
+				  "seresult=denied "
 				  "oldcontext=%s newcontext=%s",
 				  old_name, new_name);
 		}
@@ -1351,8 +1351,8 @@ static int compute_sid_handle_invalid_context(
 	if (context_struct_to_string(newcontext, &n, &nlen))
 		goto out;
 	audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR,
-		  "security_compute_sid:  invalid context %s"
-		  " for scontext=%s"
+		  "op=security_compute_sid invalid_context=%s"
+		  " scontext=%s"
 		  " tcontext=%s"
 		  " tclass=%s",
 		  n, s, t, sym_name(&policydb, SYM_CLASSES, tclass-1));
@@ -2607,8 +2607,10 @@ int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid)
 		rc = convert_context_handle_invalid_context(&newcon);
 		if (rc) {
 			if (!context_struct_to_string(&newcon, &s, &len)) {
-				audit_log(current->audit_context, GFP_ATOMIC, AUDIT_SELINUX_ERR,
-					  "security_sid_mls_copy: invalid context %s", s);
+				audit_log(current->audit_context,
+					  GFP_ATOMIC, AUDIT_SELINUX_ERR,
+					  "op=security_sid_mls_copy "
+					  "invalid_context=%s", s);
 				kfree(s);
 			}
 			goto out_unlock;