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Date: Mon, 26 Mar 2007 16:58:55 -0600
From: Joy Latten <latten@...tin.ibm.com>
To: netdev@...r.kernel.org
Cc: davemloft@...emloft.net, eparis@...hat.com, jmorris@...ei.org,
selinux@...ho.nsa.gov
Subject: Re: [PATCH]: Add security check before flushing SAD/SPD
I have made improvements based on James' and Eric's comments.
Regards,
Joy
Signed-off-by: Joy Latten<latten@...tin.ibm.com>
diff -urpN linux-2.6.20.orig/include/net/xfrm.h linux-2.6.20.patch/include/net/xfrm.h
--- linux-2.6.20.orig/include/net/xfrm.h 2007-03-23 11:01:48.000000000 -0500
+++ linux-2.6.20.patch/include/net/xfrm.h 2007-03-25 21:36:05.000000000 -0500
@@ -937,7 +937,7 @@ static inline int xfrm_state_sort(struct
#endif
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 int xfrm_replay_check(struct xfrm_state *x, __be32 seq);
extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
extern void xfrm_replay_notify(struct xfrm_state *x, int event);
@@ -991,13 +991,13 @@ struct xfrm_policy *xfrm_policy_bysel_ct
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);
diff -urpN linux-2.6.20.orig/net/key/af_key.c linux-2.6.20.patch/net/key/af_key.c
--- linux-2.6.20.orig/net/key/af_key.c 2007-03-23 11:02:49.000000000 -0500
+++ linux-2.6.20.patch/net/key/af_key.c 2007-03-25 21:34:35.000000000 -0500
@@ -1645,6 +1645,7 @@ static int pfkey_flush(struct sock *sk,
unsigned proto;
struct km_event c;
struct xfrm_audit audit_info;
+ int err;
proto = pfkey_satype2proto(hdr->sadb_msg_satype);
if (proto == 0)
@@ -1652,7 +1653,9 @@ static int pfkey_flush(struct sock *sk,
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;
@@ -2628,10 +2631,13 @@ static int pfkey_spdflush(struct sock *s
{
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;
diff -urpN linux-2.6.20.orig/net/xfrm/xfrm_policy.c linux-2.6.20.patch/net/xfrm/xfrm_policy.c
--- linux-2.6.20.orig/net/xfrm/xfrm_policy.c 2007-03-23 11:02:46.000000000 -0500
+++ linux-2.6.20.patch/net/xfrm/xfrm_policy.c 2007-03-26 17:19:26.000000000 -0500
@@ -813,11 +813,67 @@ struct xfrm_policy *xfrm_policy_byid(u8
}
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;
@@ -870,7 +926,9 @@ void xfrm_policy_flush(u8 type, struct x
xfrm_policy_count[dir] -= killed;
}
atomic_inc(&flow_cache_genid);
+out:
write_unlock_bh(&xfrm_policy_lock);
+ return err;
}
EXPORT_SYMBOL(xfrm_policy_flush);
@@ -2485,4 +2543,3 @@ restore_state:
}
EXPORT_SYMBOL(xfrm_migrate);
#endif
-
diff -urpN linux-2.6.20.orig/net/xfrm/xfrm_state.c linux-2.6.20.patch/net/xfrm/xfrm_state.c
--- linux-2.6.20.orig/net/xfrm/xfrm_state.c 2007-03-23 11:02:46.000000000 -0500
+++ linux-2.6.20.patch/net/xfrm/xfrm_state.c 2007-03-26 17:19:56.000000000 -0500
@@ -388,12 +388,48 @@ int xfrm_state_delete(struct xfrm_state
}
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;
@@ -416,8 +452,12 @@ restart:
}
}
}
+ err = 0;
+
+out:
spin_unlock_bh(&xfrm_state_lock);
wake_up(&km_waitq);
+ return err;
}
EXPORT_SYMBOL(xfrm_state_flush);
diff -urpN linux-2.6.20.orig/net/xfrm/xfrm_user.c linux-2.6.20.patch/net/xfrm/xfrm_user.c
--- linux-2.6.20.orig/net/xfrm/xfrm_user.c 2007-03-23 11:02:46.000000000 -0500
+++ linux-2.6.20.patch/net/xfrm/xfrm_user.c 2007-03-25 21:33:52.000000000 -0500
@@ -1312,10 +1312,13 @@ static int xfrm_flush_sa(struct sk_buff
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;
@@ -1476,7 +1479,9 @@ static int xfrm_flush_policy(struct sk_b
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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