[PATCH] audit: support for object context filters

This patch introduces object audit filters based on the elements
of the SELinux context.

Signed-off-by: Darrel Goeddel <dgoeddel@trustedcs.com>
Acked-by:  Stephen Smalley <sds@tycho.nsa.gov>

 kernel/auditfilter.c           |   25 +++++++++++++++++++++++++
 kernel/auditsc.c               |   40 ++++++++++++++++++++++++++++++++++++++++
 security/selinux/ss/services.c |   18 +++++++++++++++++-
 3 files changed, 82 insertions(+), 1 deletion(-)
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 17 insertions, 1 deletions

diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c
index 92e80b99d18..d2e80e62ff0 100644
--- a/security/selinux/ss/services.c
+++ b/security/selinux/ss/services.c
@@ -1848,12 +1848,17 @@ int selinux_audit_rule_init(u32 field, u32 op, char *rulestr,
         case AUDIT_SUBJ_USER:
         case AUDIT_SUBJ_ROLE:
         case AUDIT_SUBJ_TYPE:
+        case AUDIT_OBJ_USER:
+        case AUDIT_OBJ_ROLE:
+        case AUDIT_OBJ_TYPE:
                 /* only 'equals' and 'not equals' fit user, role, and type */
                 if (op != AUDIT_EQUAL && op != AUDIT_NOT_EQUAL)
                         return -EINVAL;
                 break;
         case AUDIT_SUBJ_SEN:
         case AUDIT_SUBJ_CLR:
+        case AUDIT_OBJ_LEV_LOW:
+        case AUDIT_OBJ_LEV_HIGH:
                 /* we do not allow a range, indicated by the presense of '-' */
                 if (strchr(rulestr, '-'))
                         return -EINVAL;
@@ -1875,6 +1880,7 @@ int selinux_audit_rule_init(u32 field, u32 op, char *rulestr,
 
         switch (field) {
         case AUDIT_SUBJ_USER:
+        case AUDIT_OBJ_USER:
                 userdatum = hashtab_search(policydb.p_users.table, rulestr);
                 if (!userdatum)
                         rc = -EINVAL;
@@ -1882,6 +1888,7 @@ int selinux_audit_rule_init(u32 field, u32 op, char *rulestr,
                         tmprule->au_ctxt.user = userdatum->value;
                 break;
         case AUDIT_SUBJ_ROLE:
+        case AUDIT_OBJ_ROLE:
                 roledatum = hashtab_search(policydb.p_roles.table, rulestr);
                 if (!roledatum)
                         rc = -EINVAL;
@@ -1889,6 +1896,7 @@ int selinux_audit_rule_init(u32 field, u32 op, char *rulestr,
                         tmprule->au_ctxt.role = roledatum->value;
                 break;
         case AUDIT_SUBJ_TYPE:
+        case AUDIT_OBJ_TYPE:
                 typedatum = hashtab_search(policydb.p_types.table, rulestr);
                 if (!typedatum)
                         rc = -EINVAL;
@@ -1897,6 +1905,8 @@ int selinux_audit_rule_init(u32 field, u32 op, char *rulestr,
                 break;
         case AUDIT_SUBJ_SEN:
         case AUDIT_SUBJ_CLR:
+        case AUDIT_OBJ_LEV_LOW:
+        case AUDIT_OBJ_LEV_HIGH:
                 rc = mls_from_string(rulestr, &tmprule->au_ctxt, GFP_ATOMIC);
                 break;
         }
@@ -1949,6 +1959,7 @@ int selinux_audit_rule_match(u32 ctxid, u32 field, u32 op,
            without a match */
         switch (field) {
         case AUDIT_SUBJ_USER:
+        case AUDIT_OBJ_USER:
                 switch (op) {
                 case AUDIT_EQUAL:
                         match = (ctxt->user == rule->au_ctxt.user);
@@ -1959,6 +1970,7 @@ int selinux_audit_rule_match(u32 ctxid, u32 field, u32 op,
                 }
                 break;
         case AUDIT_SUBJ_ROLE:
+        case AUDIT_OBJ_ROLE:
                 switch (op) {
                 case AUDIT_EQUAL:
                         match = (ctxt->role == rule->au_ctxt.role);
@@ -1969,6 +1981,7 @@ int selinux_audit_rule_match(u32 ctxid, u32 field, u32 op,
                 }
                 break;
         case AUDIT_SUBJ_TYPE:
+        case AUDIT_OBJ_TYPE:
                 switch (op) {
                 case AUDIT_EQUAL:
                         match = (ctxt->type == rule->au_ctxt.type);
@@ -1980,7 +1993,10 @@ int selinux_audit_rule_match(u32 ctxid, u32 field, u32 op,
                 break;
         case AUDIT_SUBJ_SEN:
         case AUDIT_SUBJ_CLR:
-                level = (field == AUDIT_SUBJ_SEN ?
+        case AUDIT_OBJ_LEV_LOW:
+        case AUDIT_OBJ_LEV_HIGH:
+                level = ((field == AUDIT_SUBJ_SEN ||
+                          field == AUDIT_OBJ_LEV_LOW) ?
                          &ctxt->range.level[0] : &ctxt->range.level[1]);
                 switch (op) {
                 case AUDIT_EQUAL: