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-rw-r--r--include/linux/security.h24
-rw-r--r--include/net/xfrm.h3
-rw-r--r--net/ipv4/xfrm4_policy.c2
-rw-r--r--net/ipv6/xfrm6_policy.c2
-rw-r--r--net/key/af_key.c5
-rw-r--r--net/xfrm/xfrm_policy.c7
-rw-r--r--net/xfrm/xfrm_user.c9
-rw-r--r--security/dummy.c3
-rw-r--r--security/selinux/include/xfrm.h3
-rw-r--r--security/selinux/xfrm.c53
10 files changed, 62 insertions, 49 deletions
diff --git a/include/linux/security.h b/include/linux/security.h
index 9b5fea81f55e..b200b9856f32 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -882,7 +882,8 @@ struct request_sock;
* Check permission when a flow selects a xfrm_policy for processing
* XFRMs on a packet. The hook is called when selecting either a
* per-socket policy or a generic xfrm policy.
- * Return 0 if permission is granted.
+ * Return 0 if permission is granted, -ESRCH otherwise, or -errno
+ * on other errors.
* @xfrm_state_pol_flow_match:
* @x contains the state to match.
* @xp contains the policy to check for a match.
@@ -891,6 +892,7 @@ struct request_sock;
* @xfrm_flow_state_match:
* @fl contains the flow key to match.
* @xfrm points to the xfrm_state to match.
+ * @xp points to the xfrm_policy to match.
* Return 1 if there is a match.
* @xfrm_decode_session:
* @skb points to skb to decode.
@@ -1388,7 +1390,8 @@ struct security_operations {
int (*xfrm_policy_lookup)(struct xfrm_policy *xp, u32 fl_secid, u8 dir);
int (*xfrm_state_pol_flow_match)(struct xfrm_state *x,
struct xfrm_policy *xp, struct flowi *fl);
- int (*xfrm_flow_state_match)(struct flowi *fl, struct xfrm_state *xfrm);
+ int (*xfrm_flow_state_match)(struct flowi *fl, struct xfrm_state *xfrm,
+ struct xfrm_policy *xp);
int (*xfrm_decode_session)(struct sk_buff *skb, u32 *secid, int ckall);
#endif /* CONFIG_SECURITY_NETWORK_XFRM */
@@ -3120,11 +3123,6 @@ static inline int security_xfrm_policy_alloc(struct xfrm_policy *xp, struct xfrm
return security_ops->xfrm_policy_alloc_security(xp, sec_ctx, NULL);
}
-static inline int security_xfrm_sock_policy_alloc(struct xfrm_policy *xp, struct sock *sk)
-{
- return security_ops->xfrm_policy_alloc_security(xp, NULL, sk);
-}
-
static inline int security_xfrm_policy_clone(struct xfrm_policy *old, struct xfrm_policy *new)
{
return security_ops->xfrm_policy_clone_security(old, new);
@@ -3175,9 +3173,10 @@ static inline int security_xfrm_state_pol_flow_match(struct xfrm_state *x,
return security_ops->xfrm_state_pol_flow_match(x, xp, fl);
}
-static inline int security_xfrm_flow_state_match(struct flowi *fl, struct xfrm_state *xfrm)
+static inline int security_xfrm_flow_state_match(struct flowi *fl,
+ struct xfrm_state *xfrm, struct xfrm_policy *xp)
{
- return security_ops->xfrm_flow_state_match(fl, xfrm);
+ return security_ops->xfrm_flow_state_match(fl, xfrm, xp);
}
static inline int security_xfrm_decode_session(struct sk_buff *skb, u32 *secid)
@@ -3197,11 +3196,6 @@ static inline int security_xfrm_policy_alloc(struct xfrm_policy *xp, struct xfrm
return 0;
}
-static inline int security_xfrm_sock_policy_alloc(struct xfrm_policy *xp, struct sock *sk)
-{
- return 0;
-}
-
static inline int security_xfrm_policy_clone(struct xfrm_policy *old, struct xfrm_policy *new)
{
return 0;
@@ -3249,7 +3243,7 @@ static inline int security_xfrm_state_pol_flow_match(struct xfrm_state *x,
}
static inline int security_xfrm_flow_state_match(struct flowi *fl,
- struct xfrm_state *xfrm)
+ struct xfrm_state *xfrm, struct xfrm_policy *xp)
{
return 1;
}
diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index 1e2a4ddec96e..737fdb2ee8a4 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -995,7 +995,8 @@ struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
int create, unsigned short family);
extern void xfrm_policy_flush(u8 type);
extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
-extern int xfrm_bundle_ok(struct xfrm_dst *xdst, struct flowi *fl, int family, int strict);
+extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
+ struct flowi *fl, int family, int strict);
extern void xfrm_init_pmtu(struct dst_entry *dst);
extern wait_queue_head_t km_waitq;
diff --git a/net/ipv4/xfrm4_policy.c b/net/ipv4/xfrm4_policy.c
index 7a7a00147e55..1bed0cdf53e3 100644
--- a/net/ipv4/xfrm4_policy.c
+++ b/net/ipv4/xfrm4_policy.c
@@ -52,7 +52,7 @@ __xfrm4_find_bundle(struct flowi *fl, struct xfrm_policy *policy)
xdst->u.rt.fl.fl4_dst == fl->fl4_dst &&
xdst->u.rt.fl.fl4_src == fl->fl4_src &&
xdst->u.rt.fl.fl4_tos == fl->fl4_tos &&
- xfrm_bundle_ok(xdst, fl, AF_INET, 0)) {
+ xfrm_bundle_ok(policy, xdst, fl, AF_INET, 0)) {
dst_clone(dst);
break;
}
diff --git a/net/ipv6/xfrm6_policy.c b/net/ipv6/xfrm6_policy.c
index 6a252e2134d1..73cee2ec07e8 100644
--- a/net/ipv6/xfrm6_policy.c
+++ b/net/ipv6/xfrm6_policy.c
@@ -73,7 +73,7 @@ __xfrm6_find_bundle(struct flowi *fl, struct xfrm_policy *policy)
xdst->u.rt6.rt6i_src.plen);
if (ipv6_addr_equal(&xdst->u.rt6.rt6i_dst.addr, &fl_dst_prefix) &&
ipv6_addr_equal(&xdst->u.rt6.rt6i_src.addr, &fl_src_prefix) &&
- xfrm_bundle_ok(xdst, fl, AF_INET6,
+ xfrm_bundle_ok(policy, xdst, fl, AF_INET6,
(xdst->u.rt6.rt6i_dst.plen != 128 ||
xdst->u.rt6.rt6i_src.plen != 128))) {
dst_clone(dst);
diff --git a/net/key/af_key.c b/net/key/af_key.c
index ff98e70b0931..20ff7cca1d07 100644
--- a/net/key/af_key.c
+++ b/net/key/af_key.c
@@ -2928,11 +2928,6 @@ static struct xfrm_policy *pfkey_compile_policy(struct sock *sk, int opt,
if (*dir)
goto out;
}
- else {
- *dir = security_xfrm_sock_policy_alloc(xp, sk);
- if (*dir)
- goto out;
- }
*dir = pol->sadb_x_policy_dir-1;
return xp;
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index fffdd34f3baf..695761ff1321 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -1744,7 +1744,7 @@ static struct dst_entry *xfrm_dst_check(struct dst_entry *dst, u32 cookie)
static int stale_bundle(struct dst_entry *dst)
{
- return !xfrm_bundle_ok((struct xfrm_dst *)dst, NULL, AF_UNSPEC, 0);
+ return !xfrm_bundle_ok(NULL, (struct xfrm_dst *)dst, NULL, AF_UNSPEC, 0);
}
void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev)
@@ -1866,7 +1866,8 @@ EXPORT_SYMBOL(xfrm_init_pmtu);
* still valid.
*/
-int xfrm_bundle_ok(struct xfrm_dst *first, struct flowi *fl, int family, int strict)
+int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first,
+ struct flowi *fl, int family, int strict)
{
struct dst_entry *dst = &first->u.dst;
struct xfrm_dst *last;
@@ -1883,7 +1884,7 @@ int xfrm_bundle_ok(struct xfrm_dst *first, struct flowi *fl, int family, int str
if (fl && !xfrm_selector_match(&dst->xfrm->sel, fl, family))
return 0;
- if (fl && !security_xfrm_flow_state_match(fl, dst->xfrm))
+ if (fl && !security_xfrm_flow_state_match(fl, dst->xfrm, pol))
return 0;
if (dst->xfrm->km.state != XFRM_STATE_VALID)
return 0;
diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index d54b3a70d5df..2b2e59d8ffbc 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -1992,15 +1992,6 @@ static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
xp->type = XFRM_POLICY_TYPE_MAIN;
copy_templates(xp, ut, nr);
- if (!xp->security) {
- int err = security_xfrm_sock_policy_alloc(xp, sk);
- if (err) {
- kfree(xp);
- *dir = err;
- return NULL;
- }
- }
-
*dir = p->dir;
return xp;
diff --git a/security/dummy.c b/security/dummy.c
index aeee70565509..43874c1e6e23 100644
--- a/security/dummy.c
+++ b/security/dummy.c
@@ -881,7 +881,8 @@ static int dummy_xfrm_state_pol_flow_match(struct xfrm_state *x,
return 1;
}
-static int dummy_xfrm_flow_state_match(struct flowi *fl, struct xfrm_state *xfrm)
+static int dummy_xfrm_flow_state_match(struct flowi *fl, struct xfrm_state *xfrm,
+ struct xfrm_policy *xp)
{
return 1;
}
diff --git a/security/selinux/include/xfrm.h b/security/selinux/include/xfrm.h
index 81eb59890162..526b28019aca 100644
--- a/security/selinux/include/xfrm.h
+++ b/security/selinux/include/xfrm.h
@@ -19,7 +19,8 @@ int selinux_xfrm_state_delete(struct xfrm_state *x);
int selinux_xfrm_policy_lookup(struct xfrm_policy *xp, u32 fl_secid, u8 dir);
int selinux_xfrm_state_pol_flow_match(struct xfrm_state *x,
struct xfrm_policy *xp, struct flowi *fl);
-int selinux_xfrm_flow_state_match(struct flowi *fl, struct xfrm_state *xfrm);
+int selinux_xfrm_flow_state_match(struct flowi *fl, struct xfrm_state *xfrm,
+ struct xfrm_policy *xp);
/*
diff --git a/security/selinux/xfrm.c b/security/selinux/xfrm.c
index 3e742b850af6..675b995a67c3 100644
--- a/security/selinux/xfrm.c
+++ b/security/selinux/xfrm.c
@@ -77,8 +77,8 @@ static inline int selinux_authorizable_xfrm(struct xfrm_state *x)
*/
int selinux_xfrm_policy_lookup(struct xfrm_policy *xp, u32 fl_secid, u8 dir)
{
- int rc = 0;
- u32 sel_sid = SECINITSID_UNLABELED;
+ int rc;
+ u32 sel_sid;
struct xfrm_sec_ctx *ctx;
/* Context sid is either set to label or ANY_ASSOC */
@@ -88,11 +88,21 @@ int selinux_xfrm_policy_lookup(struct xfrm_policy *xp, u32 fl_secid, u8 dir)
sel_sid = ctx->ctx_sid;
}
+ else
+ /*
+ * All flows should be treated as polmatch'ing an
+ * otherwise applicable "non-labeled" policy. This
+ * would prevent inadvertent "leaks".
+ */
+ return 0;
rc = avc_has_perm(fl_secid, sel_sid, SECCLASS_ASSOCIATION,
ASSOCIATION__POLMATCH,
NULL);
+ if (rc == -EACCES)
+ rc = -ESRCH;
+
return rc;
}
@@ -108,15 +118,20 @@ int selinux_xfrm_state_pol_flow_match(struct xfrm_state *x, struct xfrm_policy *
u32 pol_sid;
int err;
- if (x->security)
- state_sid = x->security->ctx_sid;
- else
- state_sid = SECINITSID_UNLABELED;
-
- if (xp->security)
+ if (xp->security) {
+ if (!x->security)
+ /* unlabeled SA and labeled policy can't match */
+ return 0;
+ else
+ state_sid = x->security->ctx_sid;
pol_sid = xp->security->ctx_sid;
- else
- pol_sid = SECINITSID_UNLABELED;
+ } else
+ if (x->security)
+ /* unlabeled policy and labeled SA can't match */
+ return 0;
+ else
+ /* unlabeled policy and unlabeled SA match all flows */
+ return 1;
err = avc_has_perm(state_sid, pol_sid, SECCLASS_ASSOCIATION,
ASSOCIATION__POLMATCH,
@@ -125,7 +140,11 @@ int selinux_xfrm_state_pol_flow_match(struct xfrm_state *x, struct xfrm_policy *
if (err)
return 0;
- return selinux_xfrm_flow_state_match(fl, x);
+ err = avc_has_perm(fl->secid, state_sid, SECCLASS_ASSOCIATION,
+ ASSOCIATION__SENDTO,
+ NULL)? 0:1;
+
+ return err;
}
/*
@@ -133,12 +152,22 @@ int selinux_xfrm_state_pol_flow_match(struct xfrm_state *x, struct xfrm_policy *
* can use a given security association.
*/
-int selinux_xfrm_flow_state_match(struct flowi *fl, struct xfrm_state *xfrm)
+int selinux_xfrm_flow_state_match(struct flowi *fl, struct xfrm_state *xfrm,
+ struct xfrm_policy *xp)
{
int rc = 0;
u32 sel_sid = SECINITSID_UNLABELED;
struct xfrm_sec_ctx *ctx;
+ if (!xp->security)
+ if (!xfrm->security)
+ return 1;
+ else
+ return 0;
+ else
+ if (!xfrm->security)
+ return 0;
+
/* Context sid is either set to label or ANY_ASSOC */
if ((ctx = xfrm->security)) {
if (!selinux_authorizable_ctx(ctx))
generated by cgit v1.2.3-58-ga151 (git 2.39.0) at 2024-12-14 10:22:39 +0000