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selinux: look for IPsec labels on both inbound and outbound packets

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Previously selinux_skb_peerlbl_sid() would only check for labeled
IPsec security labels on inbound packets, this patch enables it to
check both inbound and outbound traffic for labeled IPsec security
labels.

Reported-by: Janak Desai <Janak.Desai@gtri.gatech.edu>
Cc: stable@vger.kernel.org
Signed-off-by: Paul Moore <pmoore@redhat.com>
This commit is contained in:
Paul Moore 2013-12-10 14:57:54 -05:00
parent 446b802437
commit 817eff718d
3 changed files with 49 additions and 16 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
security/selinux/hooks.c
View file

@ -3829,7 +3829,7 @@ static int selinux_skb_peerlbl_sid(struct sk_buff *skb, u16 family, u32 *sid)
u32 nlbl_sid; u32 nlbl_sid;
u32 nlbl_type; u32 nlbl_type;
err = selinux_skb_xfrm_sid(skb, &xfrm_sid); err = selinux_xfrm_skb_sid(skb, &xfrm_sid);
if (unlikely(err)) if (unlikely(err))
return -EACCES; return -EACCES;
err = selinux_netlbl_skbuff_getsid(skb, family, &nlbl_type, &nlbl_sid); err = selinux_netlbl_skbuff_getsid(skb, family, &nlbl_type, &nlbl_sid);

12
security/selinux/include/xfrm.h
View file

@ -39,6 +39,7 @@ int selinux_xfrm_sock_rcv_skb(u32 sk_sid, struct sk_buff *skb,
int selinux_xfrm_postroute_last(u32 sk_sid, struct sk_buff *skb, int selinux_xfrm_postroute_last(u32 sk_sid, struct sk_buff *skb,
struct common_audit_data *ad, u8 proto); struct common_audit_data *ad, u8 proto);
int selinux_xfrm_decode_session(struct sk_buff *skb, u32 *sid, int ckall); int selinux_xfrm_decode_session(struct sk_buff *skb, u32 *sid, int ckall);
int selinux_xfrm_skb_sid(struct sk_buff *skb, u32 *sid);
static inline void selinux_xfrm_notify_policyload(void) static inline void selinux_xfrm_notify_policyload(void)
{ {
@ -79,11 +80,12 @@ static inline int selinux_xfrm_decode_session(struct sk_buff *skb, u32 *sid,
static inline void selinux_xfrm_notify_policyload(void) static inline void selinux_xfrm_notify_policyload(void)
{ {
} }
static inline int selinux_xfrm_skb_sid(struct sk_buff *skb, u32 *sid)
{
*sid = SECSID_NULL;
return 0;
}
#endif #endif
static inline int selinux_skb_xfrm_sid(struct sk_buff *skb, u32 *sid)
{
return selinux_xfrm_decode_session(skb, sid, 0);
}
#endif /* _SELINUX_XFRM_H_ */ #endif /* _SELINUX_XFRM_H_ */

51
security/selinux/xfrm.c
View file

@ -209,19 +209,26 @@ int selinux_xfrm_state_pol_flow_match(struct xfrm_state *x,
NULL) ? 0 : 1); NULL) ? 0 : 1);
} }
/* static u32 selinux_xfrm_skb_sid_egress(struct sk_buff *skb)
* LSM hook implementation that checks and/or returns the xfrm sid for the {
* incoming packet. struct dst_entry *dst = skb_dst(skb);
*/ struct xfrm_state *x;
int selinux_xfrm_decode_session(struct sk_buff *skb, u32 *sid, int ckall)
if (dst == NULL)
return SECSID_NULL;
x = dst->xfrm;
if (x == NULL || !selinux_authorizable_xfrm(x))
return SECSID_NULL;
return x->security->ctx_sid;
}
static int selinux_xfrm_skb_sid_ingress(struct sk_buff *skb,
u32 *sid, int ckall)
{ {
u32 sid_session = SECSID_NULL; u32 sid_session = SECSID_NULL;
struct sec_path *sp; struct sec_path *sp = skb->sp;
if (skb == NULL)
goto out;
sp = skb->sp;
if (sp) { if (sp) {
int i; int i;
@ -247,6 +254,30 @@ out:
return 0; return 0;
} }
/*
* LSM hook implementation that checks and/or returns the xfrm sid for the
* incoming packet.
*/
int selinux_xfrm_decode_session(struct sk_buff *skb, u32 *sid, int ckall)
{
if (skb == NULL) {
*sid = SECSID_NULL;
return 0;
}
return selinux_xfrm_skb_sid_ingress(skb, sid, ckall);
}
int selinux_xfrm_skb_sid(struct sk_buff *skb, u32 *sid)
{
int rc;
rc = selinux_xfrm_skb_sid_ingress(skb, sid, 0);
if (rc == 0 && *sid == SECSID_NULL)
*sid = selinux_xfrm_skb_sid_egress(skb);
return rc;
}
/* /*
* LSM hook implementation that allocs and transfers uctx spec to xfrm_policy. * LSM hook implementation that allocs and transfers uctx spec to xfrm_policy.
*/ */