aboutsummaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorKaiGai Kohei <kaigai@ak.jp.nec.com>2009-06-18 17:26:13 +0900
committerJames Morris <jmorris@namei.org>2009-06-19 00:12:28 +1000
commit44c2d9bdd7022ca7d240d5adc009296fc1c6ce08 (patch)
tree33115ee8d7e167d2a26558c2af8e0edfdca099d5
parentcaabbdc07df4249f2ed516b2c3e2d6b0973bcbb3 (diff)
downloadmrst-s0i3-test-44c2d9bdd7022ca7d240d5adc009296fc1c6ce08.tar.gz
mrst-s0i3-test-44c2d9bdd7022ca7d240d5adc009296fc1c6ce08.tar.xz
mrst-s0i3-test-44c2d9bdd7022ca7d240d5adc009296fc1c6ce08.zip
Add audit messages on type boundary violations
The attached patch adds support to generate audit messages on two cases. The first one is a case when a multi-thread process tries to switch its performing security context using setcon(3), but new security context is not bounded by the old one. type=SELINUX_ERR msg=audit(1245311998.599:17): \ op=security_bounded_transition result=denied \ oldcontext=system_u:system_r:httpd_t:s0 \ newcontext=system_u:system_r:guest_webapp_t:s0 The other one is a case when security_compute_av() masked any permissions due to the type boundary violation. type=SELINUX_ERR msg=audit(1245312836.035:32): \ op=security_compute_av reason=bounds \ scontext=system_u:object_r:user_webapp_t:s0 \ tcontext=system_u:object_r:shadow_t:s0:c0 \ tclass=file perms=getattr,open Signed-off-by: KaiGai Kohei <kaigai@ak.jp.nec.com> Acked-by: Stephen Smalley <sds@tycho.nsa.gov> Signed-off-by: James Morris <jmorris@namei.org>
-rw-r--r--security/selinux/avc.c2
-rw-r--r--security/selinux/include/avc.h3
-rw-r--r--security/selinux/ss/services.c136
3 files changed, 118 insertions, 23 deletions
diff --git a/security/selinux/avc.c b/security/selinux/avc.c
index 7f9b5fac877..4bf5d08a1f5 100644
--- a/security/selinux/avc.c
+++ b/security/selinux/avc.c
@@ -137,7 +137,7 @@ static inline int avc_hash(u32 ssid, u32 tsid, u16 tclass)
* @tclass: target security class
* @av: access vector
*/
-void avc_dump_av(struct audit_buffer *ab, u16 tclass, u32 av)
+static void avc_dump_av(struct audit_buffer *ab, u16 tclass, u32 av)
{
const char **common_pts = NULL;
u32 common_base = 0;
diff --git a/security/selinux/include/avc.h b/security/selinux/include/avc.h
index d12ff1a9c0a..46a940d9af6 100644
--- a/security/selinux/include/avc.h
+++ b/security/selinux/include/avc.h
@@ -127,9 +127,6 @@ int avc_add_callback(int (*callback)(u32 event, u32 ssid, u32 tsid,
u32 events, u32 ssid, u32 tsid,
u16 tclass, u32 perms);
-/* Shows permission in human readable form */
-void avc_dump_av(struct audit_buffer *ab, u16 tclass, u32 av);
-
/* Exported to selinuxfs */
int avc_get_hash_stats(char *page);
extern unsigned int avc_cache_threshold;
diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c
index cad5765ca1c..a90cab207d9 100644
--- a/security/selinux/ss/services.c
+++ b/security/selinux/ss/services.c
@@ -22,6 +22,11 @@
*
* Added validation of kernel classes and permissions
*
+ * Updated: KaiGai Kohei <kaigai@ak.jp.nec.com>
+ *
+ * Added support for bounds domain and audit messaged on masked permissions
+ *
+ * Copyright (C) 2008, 2009 NEC Corporation
* Copyright (C) 2006, 2007 Hewlett-Packard Development Company, L.P.
* Copyright (C) 2004-2006 Trusted Computer Solutions, Inc.
* Copyright (C) 2003 - 2004, 2006 Tresys Technology, LLC
@@ -279,6 +284,95 @@ mls_ops:
}
/*
+ * security_dump_masked_av - dumps masked permissions during
+ * security_compute_av due to RBAC, MLS/Constraint and Type bounds.
+ */
+static int dump_masked_av_helper(void *k, void *d, void *args)
+{
+ struct perm_datum *pdatum = d;
+ char **permission_names = args;
+
+ BUG_ON(pdatum->value < 1 || pdatum->value > 32);
+
+ permission_names[pdatum->value - 1] = (char *)k;
+
+ return 0;
+}
+
+static void security_dump_masked_av(struct context *scontext,
+ struct context *tcontext,
+ u16 tclass,
+ u32 permissions,
+ const char *reason)
+{
+ struct common_datum *common_dat;
+ struct class_datum *tclass_dat;
+ struct audit_buffer *ab;
+ char *tclass_name;
+ char *scontext_name = NULL;
+ char *tcontext_name = NULL;
+ char *permission_names[32];
+ int index, length;
+ bool need_comma = false;
+
+ if (!permissions)
+ return;
+
+ tclass_name = policydb.p_class_val_to_name[tclass - 1];
+ tclass_dat = policydb.class_val_to_struct[tclass - 1];
+ common_dat = tclass_dat->comdatum;
+
+ /* init permission_names */
+ if (common_dat &&
+ hashtab_map(common_dat->permissions.table,
+ dump_masked_av_helper, permission_names) < 0)
+ goto out;
+
+ if (hashtab_map(tclass_dat->permissions.table,
+ dump_masked_av_helper, permission_names) < 0)
+ goto out;
+
+ /* get scontext/tcontext in text form */
+ if (context_struct_to_string(scontext,
+ &scontext_name, &length) < 0)
+ goto out;
+
+ if (context_struct_to_string(tcontext,
+ &tcontext_name, &length) < 0)
+ goto out;
+
+ /* audit a message */
+ ab = audit_log_start(current->audit_context,
+ GFP_ATOMIC, AUDIT_SELINUX_ERR);
+ if (!ab)
+ goto out;
+
+ audit_log_format(ab, "op=security_compute_av reason=%s "
+ "scontext=%s tcontext=%s tclass=%s perms=",
+ reason, scontext_name, tcontext_name, tclass_name);
+
+ for (index = 0; index < 32; index++) {
+ u32 mask = (1 << index);
+
+ if ((mask & permissions) == 0)
+ continue;
+
+ audit_log_format(ab, "%s%s",
+ need_comma ? "," : "",
+ permission_names[index]
+ ? permission_names[index] : "????");
+ need_comma = true;
+ }
+ audit_log_end(ab);
+out:
+ /* release scontext/tcontext */
+ kfree(tcontext_name);
+ kfree(scontext_name);
+
+ return;
+}
+
+/*
* security_boundary_permission - drops violated permissions
* on boundary constraint.
*/
@@ -347,28 +441,12 @@ static void type_attribute_bounds_av(struct context *scontext,
}
if (masked) {
- struct audit_buffer *ab;
- char *stype_name
- = policydb.p_type_val_to_name[source->value - 1];
- char *ttype_name
- = policydb.p_type_val_to_name[target->value - 1];
- char *tclass_name
- = policydb.p_class_val_to_name[tclass - 1];
-
/* mask violated permissions */
avd->allowed &= ~masked;
- /* notice to userspace via audit message */
- ab = audit_log_start(current->audit_context,
- GFP_ATOMIC, AUDIT_SELINUX_ERR);
- if (!ab)
- return;
-
- audit_log_format(ab, "av boundary violation: "
- "source=%s target=%s tclass=%s",
- stype_name, ttype_name, tclass_name);
- avc_dump_av(ab, tclass, masked);
- audit_log_end(ab);
+ /* audit masked permissions */
+ security_dump_masked_av(scontext, tcontext,
+ tclass, masked, "bounds");
}
}
@@ -711,6 +789,26 @@ int security_bounded_transition(u32 old_sid, u32 new_sid)
}
index = type->bounds;
}
+
+ if (rc) {
+ char *old_name = NULL;
+ char *new_name = NULL;
+ int length;
+
+ if (!context_struct_to_string(old_context,
+ &old_name, &length) &&
+ !context_struct_to_string(new_context,
+ &new_name, &length)) {
+ audit_log(current->audit_context,
+ GFP_ATOMIC, AUDIT_SELINUX_ERR,
+ "op=security_bounded_transition "
+ "result=denied "
+ "oldcontext=%s newcontext=%s",
+ old_name, new_name);
+ }
+ kfree(new_name);
+ kfree(old_name);
+ }
out:
read_unlock(&policy_rwlock);