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authorAndrew Perepechko <anserper@ya.ru>2015-12-24 11:09:41 -0500
committerPaul Moore <pmoore@redhat.com>2015-12-24 11:09:41 -0500
commitf9df6458218f4fe8a1c3bf0af89c1fa9eaf0db39 (patch)
treebed3081497a3b7a628fe77f919514e01650d4d8a /security/selinux/ss
parentf39814f60ad0fa982ac87a97af1fb0bde244c319 (diff)
selinux: export validatetrans decisions
Make validatetrans decisions available through selinuxfs. "/validatetrans" is added to selinuxfs for this purpose. This functionality is needed by file system servers implemented in userspace or kernelspace without the VFS layer. Writing "$oldcontext $newcontext $tclass $taskcontext" to /validatetrans is expected to return 0 if the transition is allowed and -EPERM otherwise. Signed-off-by: Andrew Perepechko <anserper@ya.ru> CC: andrew.perepechko@seagate.com Acked-by: Stephen Smalley <sds@tycho.nsa.gov> Signed-off-by: Paul Moore <pmoore@redhat.com>
Diffstat (limited to 'security/selinux/ss')
-rw-r--r--security/selinux/ss/services.c34
1 files changed, 27 insertions, 7 deletions
diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c
index ebb5eb3c318c..ebda97333f1b 100644
--- a/security/selinux/ss/services.c
+++ b/security/selinux/ss/services.c
@@ -778,8 +778,8 @@ out:
return -EPERM;
}
-int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid,
- u16 orig_tclass)
+static int security_compute_validatetrans(u32 oldsid, u32 newsid, u32 tasksid,
+ u16 orig_tclass, bool user)
{
struct context *ocontext;
struct context *ncontext;
@@ -794,11 +794,12 @@ int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid,
read_lock(&policy_rwlock);
- tclass = unmap_class(orig_tclass);
+ if (!user)
+ tclass = unmap_class(orig_tclass);
+ else
+ tclass = orig_tclass;
if (!tclass || tclass > policydb.p_classes.nprim) {
- printk(KERN_ERR "SELinux: %s: unrecognized class %d\n",
- __func__, tclass);
rc = -EINVAL;
goto out;
}
@@ -832,8 +833,13 @@ int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid,
while (constraint) {
if (!constraint_expr_eval(ocontext, ncontext, tcontext,
constraint->expr)) {
- rc = security_validtrans_handle_fail(ocontext, ncontext,
- tcontext, tclass);
+ if (user)
+ rc = -EPERM;
+ else
+ rc = security_validtrans_handle_fail(ocontext,
+ ncontext,
+ tcontext,
+ tclass);
goto out;
}
constraint = constraint->next;
@@ -844,6 +850,20 @@ out:
return rc;
}
+int security_validate_transition_user(u32 oldsid, u32 newsid, u32 tasksid,
+ u16 tclass)
+{
+ return security_compute_validatetrans(oldsid, newsid, tasksid,
+ tclass, true);
+}
+
+int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid,
+ u16 orig_tclass)
+{
+ return security_compute_validatetrans(oldsid, newsid, tasksid,
+ orig_tclass, false);
+}
+
/*
* security_bounded_transition - check whether the given
* transition is directed to bounded, or not.