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-rw-r--r--source4/dsdb/samdb/ldb_modules/rootdse.c103
1 files changed, 84 insertions, 19 deletions
diff --git a/source4/dsdb/samdb/ldb_modules/rootdse.c b/source4/dsdb/samdb/ldb_modules/rootdse.c
index a51785e64d..5c6090fc68 100644
--- a/source4/dsdb/samdb/ldb_modules/rootdse.c
+++ b/source4/dsdb/samdb/ldb_modules/rootdse.c
@@ -535,34 +535,84 @@ static int rootdse_callback(struct ldb_request *req, struct ldb_reply *ares)
}
/*
- mark our registered controls as non-critical in the request
-
- This is needed as clients may mark controls as critical even if they
- are not needed at all in a request. For example, the centrify client
- sets the SD_FLAGS control as critical on ldap modify requests which
- are setting the dNSHostName attribute on the machine account. That
- request doesn't need SD_FLAGS at all, but centrify adds it on all
- ldap requests.
+ filter from controls from clients in several ways
+
+ 1) mark our registered controls as non-critical in the request
+
+ This is needed as clients may mark controls as critical even if
+ they are not needed at all in a request. For example, the centrify
+ client sets the SD_FLAGS control as critical on ldap modify
+ requests which are setting the dNSHostName attribute on the
+ machine account. That request doesn't need SD_FLAGS at all, but
+ centrify adds it on all ldap requests.
+
+ 2) if this request is untrusted then remove any non-registered
+ controls that are non-critical
+
+ This is used on ldap:// connections to prevent remote users from
+ setting an internal control that may be dangerous
+
+ 3) if this request is untrusted then fail any request that includes
+ a critical non-registered control
*/
-static void rootdse_mark_noncritical(struct ldb_module *module, struct ldb_control **controls)
+static int rootdse_filter_controls(struct ldb_module *module, struct ldb_request *req)
{
unsigned int i, j;
struct private_data *priv = talloc_get_type(ldb_module_get_private(module), struct private_data);
+ bool is_untrusted;
- if (!controls) return;
+ if (!req->controls) {
+ return LDB_SUCCESS;
+ }
+
+ is_untrusted = ldb_req_is_untrusted(req);
- for (i=0; controls[i]; i++) {
- if (controls[i]->critical == 0) {
+ for (i=0; req->controls[i]; i++) {
+ bool is_registered = false;
+ bool is_critical = (req->controls[i]->critical != 0);
+
+ if (req->controls[i]->oid == NULL) {
continue;
}
- for (j=0; j<priv->num_controls; j++) {
- if (strcasecmp(priv->controls[j], controls[i]->oid) == 0) {
- controls[i]->critical = 0;
+
+ if (is_untrusted || is_critical) {
+ for (j=0; j<priv->num_controls; j++) {
+ if (strcasecmp(priv->controls[j], req->controls[i]->oid) == 0) {
+ is_registered = true;
+ break;
+ }
}
}
+
+ if (is_untrusted && !is_registered) {
+ if (!is_critical) {
+ /* remove it by marking the oid NULL */
+ req->controls[i]->oid = NULL;
+ req->controls[i]->data = NULL;
+ req->controls[i]->critical = 0;
+ continue;
+ }
+ /* its a critical unregistered control - give
+ an error */
+ ldb_asprintf_errstring(ldb_module_get_ctx(module),
+ "Attempt to use critical non-registered control '%s'",
+ req->controls[i]->oid);
+ return LDB_ERR_UNSUPPORTED_CRITICAL_EXTENSION;
+ }
+
+ if (!is_critical) {
+ continue;
+ }
+
+ if (is_registered) {
+ req->controls[i]->critical = 0;
+ }
}
+
+ return LDB_SUCCESS;
}
+
static int rootdse_search(struct ldb_module *module, struct ldb_request *req)
{
struct ldb_context *ldb;
@@ -570,7 +620,10 @@ static int rootdse_search(struct ldb_module *module, struct ldb_request *req)
struct ldb_request *down_req;
int ret;
- rootdse_mark_noncritical(module, req->controls);
+ ret = rootdse_filter_controls(module, req);
+ if (ret != LDB_SUCCESS) {
+ return ret;
+ }
ldb = ldb_module_get_ctx(module);
@@ -1036,8 +1089,12 @@ static int rootdse_schemaupdatenow(struct ldb_module *module, struct ldb_request
static int rootdse_add(struct ldb_module *module, struct ldb_request *req)
{
struct ldb_context *ldb = ldb_module_get_ctx(module);
+ int ret;
- rootdse_mark_noncritical(module, req->controls);
+ ret = rootdse_filter_controls(module, req);
+ if (ret != LDB_SUCCESS) {
+ return ret;
+ }
/*
If dn is not "" we should let it pass through
@@ -1103,8 +1160,12 @@ static int rootdse_become_master(struct ldb_module *module,
static int rootdse_modify(struct ldb_module *module, struct ldb_request *req)
{
struct ldb_context *ldb = ldb_module_get_ctx(module);
+ int ret;
- rootdse_mark_noncritical(module, req->controls);
+ ret = rootdse_filter_controls(module, req);
+ if (ret != LDB_SUCCESS) {
+ return ret;
+ }
/*
If dn is not "" we should let it pass through
@@ -1146,8 +1207,12 @@ static int rootdse_modify(struct ldb_module *module, struct ldb_request *req)
static int rootdse_delete(struct ldb_module *module, struct ldb_request *req)
{
struct ldb_context *ldb = ldb_module_get_ctx(module);
+ int ret;
- rootdse_mark_noncritical(module, req->controls);
+ ret = rootdse_filter_controls(module, req);
+ if (ret != LDB_SUCCESS) {
+ return ret;
+ }
/*
If dn is not "" we should let it pass through