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authorPaul Moore <paul.moore@hp.com>2008-01-29 08:43:36 -0500
committerJames Morris <jmorris@namei.org>2008-01-30 08:17:26 +1100
commitd621d35e576aa20a0ddae8022c3810f38357c8ff (patch)
tree318e8aa890dbe715b901b11b019ebac3badb693d /security/selinux/xfrm.c
parent220deb966ea51e0dedb6a187c0763120809f3e64 (diff)
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SELinux: Enable dynamic enable/disable of the network access checks
This patch introduces a mechanism for checking when labeled IPsec or SECMARK are in use by keeping introducing a configuration reference counter for each subsystem. In the case of labeled IPsec, whenever a labeled SA or SPD entry is created the labeled IPsec/XFRM reference count is increased and when the entry is removed it is decreased. In the case of SECMARK, when a SECMARK target is created the reference count is increased and later decreased when the target is removed. These reference counters allow SELinux to quickly determine if either of these subsystems are enabled. NetLabel already has a similar mechanism which provides the netlbl_enabled() function. This patch also renames the selinux_relabel_packet_permission() function to selinux_secmark_relabel_packet_permission() as the original name and description were misleading in that they referenced a single packet label which is not the case. Signed-off-by: Paul Moore <paul.moore@hp.com> Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'security/selinux/xfrm.c')
-rw-r--r--security/selinux/xfrm.c18
1 files changed, 16 insertions, 2 deletions
diff --git a/security/selinux/xfrm.c b/security/selinux/xfrm.c
index e0760396903..7e158205d08 100644
--- a/security/selinux/xfrm.c
+++ b/security/selinux/xfrm.c
@@ -46,11 +46,14 @@
#include <net/checksum.h>
#include <net/udp.h>
#include <asm/semaphore.h>
+#include <asm/atomic.h>
#include "avc.h"
#include "objsec.h"
#include "xfrm.h"
+/* Labeled XFRM instance counter */
+atomic_t selinux_xfrm_refcount = ATOMIC_INIT(0);
/*
* Returns true if an LSM/SELinux context
@@ -293,6 +296,9 @@ int selinux_xfrm_policy_alloc(struct xfrm_policy *xp,
BUG_ON(!uctx);
err = selinux_xfrm_sec_ctx_alloc(&xp->security, uctx, 0);
+ if (err == 0)
+ atomic_inc(&selinux_xfrm_refcount);
+
return err;
}
@@ -340,10 +346,13 @@ int selinux_xfrm_policy_delete(struct xfrm_policy *xp)
struct xfrm_sec_ctx *ctx = xp->security;
int rc = 0;
- if (ctx)
+ if (ctx) {
rc = avc_has_perm(tsec->sid, ctx->ctx_sid,
SECCLASS_ASSOCIATION,
ASSOCIATION__SETCONTEXT, NULL);
+ if (rc == 0)
+ atomic_dec(&selinux_xfrm_refcount);
+ }
return rc;
}
@@ -360,6 +369,8 @@ int selinux_xfrm_state_alloc(struct xfrm_state *x, struct xfrm_user_sec_ctx *uct
BUG_ON(!x);
err = selinux_xfrm_sec_ctx_alloc(&x->security, uctx, secid);
+ if (err == 0)
+ atomic_inc(&selinux_xfrm_refcount);
return err;
}
@@ -382,10 +393,13 @@ int selinux_xfrm_state_delete(struct xfrm_state *x)
struct xfrm_sec_ctx *ctx = x->security;
int rc = 0;
- if (ctx)
+ if (ctx) {
rc = avc_has_perm(tsec->sid, ctx->ctx_sid,
SECCLASS_ASSOCIATION,
ASSOCIATION__SETCONTEXT, NULL);
+ if (rc == 0)
+ atomic_dec(&selinux_xfrm_refcount);
+ }
return rc;
}