[Asterisk-code-review] AST-2018-008: Fix enumeration of endpoints from ACL rejected... (asterisk[15.4])

[Kevin Harwell]

Kevin Harwell has submitted this change and it was merged. ( https://gerrit.asterisk.org/9159 )

Change subject: AST-2018-008: Fix enumeration of endpoints from ACL rejected addresses.
......................................................................

AST-2018-008: Fix enumeration of endpoints from ACL rejected addresses.

When endpoint specific ACL rules block a SIP request they respond with a
403 forbidden.  However, if an endpoint is not identified then a 401
unauthorized response is sent.  This vulnerability just discloses which
requests hit a defined endpoint.  The ACL rules cannot be bypassed to gain
access to the disclosed endpoints.

* Made endpoint specific ACL rules now respond with a 401 unauthorized
which is the same as if an endpoint were not identified.  The fix is
accomplished by replacing the found endpoint with the artificial endpoint
which always fails authentication.

ASTERISK-27818

Change-Id: Icb275a54ff8e2df6c671a6d9bda37b5d732b3b32
---
M res/res_pjsip/pjsip_distributor.c
1 file changed, 30 insertions(+), 8 deletions(-)

Approvals:
  Jenkins2: Verified
  Kevin Harwell: Looks good to me, approved; Approved for Submit



diff --git a/res/res_pjsip/pjsip_distributor.c b/res/res_pjsip/pjsip_distributor.c
index 7f512d1..5173817 100644
--- a/res/res_pjsip/pjsip_distributor.c
+++ b/res/res_pjsip/pjsip_distributor.c
@@ -676,6 +676,26 @@
 	ao2_unlock(unid);
 }
 
+static int apply_endpoint_acl(pjsip_rx_data *rdata, struct ast_sip_endpoint *endpoint);
+static int apply_endpoint_contact_acl(pjsip_rx_data *rdata, struct ast_sip_endpoint *endpoint);
+
+static void apply_acls(pjsip_rx_data *rdata)
+{
+	struct ast_sip_endpoint *endpoint;
+
+	/* Is the endpoint allowed with the source or contact address? */
+	endpoint = rdata->endpt_info.mod_data[endpoint_mod.id];
+	if (endpoint != artificial_endpoint
+		&& (apply_endpoint_acl(rdata, endpoint)
+			|| apply_endpoint_contact_acl(rdata, endpoint))) {
+		ast_debug(1, "Endpoint '%s' not allowed by ACL\n",
+			ast_sorcery_object_get_id(endpoint));
+
+		/* Replace the rdata endpoint with the artificial endpoint. */
+		ao2_replace(rdata->endpt_info.mod_data[endpoint_mod.id], artificial_endpoint);
+	}
+}
+
 static pj_bool_t endpoint_lookup(pjsip_rx_data *rdata)
 {
 	struct ast_sip_endpoint *endpoint;
@@ -694,6 +714,7 @@
 			ao2_unlink(unidentified_requests, unid);
 			ao2_ref(unid, -1);
 		}
+		apply_acls(rdata);
 		return PJ_FALSE;
 	}
 
@@ -753,6 +774,8 @@
 			ast_sip_report_invalid_endpoint(name, rdata);
 		}
 	}
+
+	apply_acls(rdata);
 	return PJ_FALSE;
 }
 
@@ -836,16 +859,11 @@
 
 	ast_assert(endpoint != NULL);
 
-	if (endpoint!=artificial_endpoint) {
-		if (apply_endpoint_acl(rdata, endpoint) || apply_endpoint_contact_acl(rdata, endpoint)) {
-			if (!is_ack) {
-				pjsip_endpt_respond_stateless(ast_sip_get_pjsip_endpoint(), rdata, 403, NULL, NULL, NULL);
-			}
-			return PJ_TRUE;
-		}
+	if (is_ack) {
+		return PJ_FALSE;
 	}
 
-	if (!is_ack && ast_sip_requires_authentication(endpoint, rdata)) {
+	if (ast_sip_requires_authentication(endpoint, rdata)) {
 		pjsip_tx_data *tdata;
 		struct unidentified_request *unid;
 
@@ -881,6 +899,10 @@
 			return PJ_TRUE;
 		}
 		pjsip_tx_data_dec_ref(tdata);
+	} else if (endpoint == artificial_endpoint) {
+		/* Uh. Oh.  The artificial endpoint couldn't challenge so block the request. */
+		pjsip_endpt_respond_stateless(ast_sip_get_pjsip_endpoint(), rdata, 500, NULL, NULL, NULL);
+		return PJ_TRUE;
 	}
 
 	return PJ_FALSE;

-- 
To view, visit https://gerrit.asterisk.org/9159
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Gerrit-Project: asterisk
Gerrit-Branch: 15.4
Gerrit-MessageType: merged
Gerrit-Change-Id: Icb275a54ff8e2df6c671a6d9bda37b5d732b3b32
Gerrit-Change-Number: 9159
Gerrit-PatchSet: 1
Gerrit-Owner: Richard Mudgett <rmudgett at digium.com>
Gerrit-Reviewer: Jenkins2
Gerrit-Reviewer: Kevin Harwell <kharwell at digium.com>
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