Commit 4aa2e62c authored by Joy Latten's avatar Joy Latten Committed by David S. Miller
Browse files

xfrm: Add security check before flushing SAD/SPD 



Currently we check for permission before deleting entries from SAD and
SPD, (see security_xfrm_policy_delete() security_xfrm_state_delete())
However we are not checking for authorization when flushing the SPD and
the SAD completely. It was perhaps missed in the original security hooks
patch.

This patch adds a security check when flushing entries from the SAD and
SPD.  It runs the entire database and checks each entry for a denial.
If the process attempting the flush is unable to remove all of the
entries a denial is logged the the flush function returns an error
without removing anything.

This is particularly useful when a process may need to create or delete
its own xfrm entries used for things like labeled networking but that
same process should not be able to delete other entries or flush the
entire database.

Signed-off-by: default avatarJoy <Latten&lt;latten@austin.ibm.com>
Signed-off-by: default avatarEric Paris <eparis@parisplace.org>
Signed-off-by: default avatarJames Morris <jmorris@namei.org>
parent b00b4bf9

include/net/xfrm.h

+3 −3
Original line number Diff line number Diff line
@@ -964,7 +964,7 @@ struct xfrmk_spdinfo { 


extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);

extern int xfrm_state_delete(struct xfrm_state *x);

extern void xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info);

extern int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info);

extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si);

extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si);

extern int xfrm_replay_check(struct xfrm_state *x, __be32 seq);
@@ -1020,13 +1020,13 @@ struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir, 
					  struct xfrm_sec_ctx *ctx, int delete,

					  int *err);

struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err);

void xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);

int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);

u32 xfrm_get_acqseq(void);

void xfrm_alloc_spi(struct xfrm_state *x, __be32 minspi, __be32 maxspi);

struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,

				  xfrm_address_t *daddr, xfrm_address_t *saddr,

				  int create, unsigned short family);

extern void xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);

extern int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);

extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);

extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,

			  struct flowi *fl, int family, int strict);

net/key/af_key.c

+8 −2
Original line number Diff line number Diff line
@@ -1682,6 +1682,7 @@ static int pfkey_flush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hd 
	unsigned proto;

	struct km_event c;

	struct xfrm_audit audit_info;

	int err;



	proto = pfkey_satype2proto(hdr->sadb_msg_satype);

	if (proto == 0)
@@ -1689,7 +1690,9 @@ static int pfkey_flush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hd 


	audit_info.loginuid = audit_get_loginuid(current->audit_context);

	audit_info.secid = 0;

	xfrm_state_flush(proto, &audit_info);

	err = xfrm_state_flush(proto, &audit_info);

	if (err)

		return err;

	c.data.proto = proto;

	c.seq = hdr->sadb_msg_seq;

	c.pid = hdr->sadb_msg_pid;
@@ -2683,10 +2686,13 @@ static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, struct sadb_msg 
{

	struct km_event c;

	struct xfrm_audit audit_info;

	int err;



	audit_info.loginuid = audit_get_loginuid(current->audit_context);

	audit_info.secid = 0;

	xfrm_policy_flush(XFRM_POLICY_TYPE_MAIN, &audit_info);

	err = xfrm_policy_flush(XFRM_POLICY_TYPE_MAIN, &audit_info);

	if (err)

		return err;

	c.data.type = XFRM_POLICY_TYPE_MAIN;

	c.event = XFRM_MSG_FLUSHPOLICY;

	c.pid = hdr->sadb_msg_pid;

net/xfrm/xfrm_policy.c

+60 −3
Original line number Diff line number Diff line
@@ -834,11 +834,67 @@ struct xfrm_policy *xfrm_policy_byid(u8 type, int dir, u32 id, int delete, 
}

EXPORT_SYMBOL(xfrm_policy_byid);



void xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info)

#ifdef CONFIG_SECURITY_NETWORK_XFRM

static inline int

xfrm_policy_flush_secctx_check(u8 type, struct xfrm_audit *audit_info)

{

	int dir;

	int dir, err = 0;



	for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {

		struct xfrm_policy *pol;

		struct hlist_node *entry;

		int i;



		hlist_for_each_entry(pol, entry,

				     &xfrm_policy_inexact[dir], bydst) {

			if (pol->type != type)

				continue;

			err = security_xfrm_policy_delete(pol);

			if (err) {

				xfrm_audit_log(audit_info->loginuid,

					       audit_info->secid,

					       AUDIT_MAC_IPSEC_DELSPD, 0,

					       pol, NULL);

				return err;

			}

                }

		for (i = xfrm_policy_bydst[dir].hmask; i >= 0; i--) {

			hlist_for_each_entry(pol, entry,

					     xfrm_policy_bydst[dir].table + i,

					     bydst) {

				if (pol->type != type)

					continue;

				err = security_xfrm_policy_delete(pol);

				if (err) {

					xfrm_audit_log(audit_info->loginuid,

						       audit_info->secid,

						       AUDIT_MAC_IPSEC_DELSPD,

						       0, pol, NULL);

					return err;

				}

			}

		}

	}

	return err;

}

#else

static inline int

xfrm_policy_flush_secctx_check(u8 type, struct xfrm_audit *audit_info)

{

	return 0;

}

#endif



int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info)

{

	int dir, err = 0;



	write_lock_bh(&xfrm_policy_lock);



	err = xfrm_policy_flush_secctx_check(type, audit_info);

	if (err)

		goto out;



	for (dir = 0; dir < XFRM_POLICY_MAX; dir++) {

		struct xfrm_policy *pol;

		struct hlist_node *entry;
@@ -891,7 +947,9 @@ void xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info) 
		xfrm_policy_count[dir] -= killed;

	}

	atomic_inc(&flow_cache_genid);

out:

	write_unlock_bh(&xfrm_policy_lock);

	return err;

}

EXPORT_SYMBOL(xfrm_policy_flush);
@@ -2583,4 +2641,3 @@ restore_state: 
}

EXPORT_SYMBOL(xfrm_migrate);

#endif

net/xfrm/xfrm_state.c

+43 −3
Original line number Diff line number Diff line
@@ -391,12 +391,48 @@ int xfrm_state_delete(struct xfrm_state *x) 
}

EXPORT_SYMBOL(xfrm_state_delete);



void xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info)

#ifdef CONFIG_SECURITY_NETWORK_XFRM

static inline int

xfrm_state_flush_secctx_check(u8 proto, struct xfrm_audit *audit_info)

{

	int i;

	int err = 0;

	int i, err = 0;



	for (i = 0; i <= xfrm_state_hmask; i++) {

		struct hlist_node *entry;

		struct xfrm_state *x;



		hlist_for_each_entry(x, entry, xfrm_state_bydst+i, bydst) {

			if (xfrm_id_proto_match(x->id.proto, proto) &&

			   (err = security_xfrm_state_delete(x)) != 0) {

				xfrm_audit_log(audit_info->loginuid,

					       audit_info->secid,

					       AUDIT_MAC_IPSEC_DELSA,

                                               0, NULL, x);



				return err;

			}

		}

	}



	return err;

}

#else

static inline int

xfrm_state_flush_secctx_check(u8 proto, struct xfrm_audit *audit_info)

{

	return 0;

}

#endif



int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info)

{

	int i, err = 0;



	spin_lock_bh(&xfrm_state_lock);

	err = xfrm_state_flush_secctx_check(proto, audit_info);

	if (err)

		goto out;



	for (i = 0; i <= xfrm_state_hmask; i++) {

		struct hlist_node *entry;

		struct xfrm_state *x;
@@ -419,8 +455,12 @@ restart: 
			}

		}

	}

	err = 0;



out:

	spin_unlock_bh(&xfrm_state_lock);

	wake_up(&km_waitq);

	return err;

}

EXPORT_SYMBOL(xfrm_state_flush);

net/xfrm/xfrm_user.c

+7 −2
Original line number Diff line number Diff line
@@ -1418,10 +1418,13 @@ static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, 
	struct km_event c;

	struct xfrm_usersa_flush *p = NLMSG_DATA(nlh);

	struct xfrm_audit audit_info;

	int err;



	audit_info.loginuid = NETLINK_CB(skb).loginuid;

	audit_info.secid = NETLINK_CB(skb).sid;

	xfrm_state_flush(p->proto, &audit_info);

	err = xfrm_state_flush(p->proto, &audit_info);

	if (err)

		return err;

	c.data.proto = p->proto;

	c.event = nlh->nlmsg_type;

	c.seq = nlh->nlmsg_seq;
@@ -1582,7 +1585,9 @@ static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, 


	audit_info.loginuid = NETLINK_CB(skb).loginuid;

	audit_info.secid = NETLINK_CB(skb).sid;

	xfrm_policy_flush(type, &audit_info);

	err = xfrm_policy_flush(type, &audit_info);

	if (err)

		return err;

	c.data.type = type;

	c.event = nlh->nlmsg_type;

	c.seq = nlh->nlmsg_seq;

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