Change how realms are handled for outbound authentication.

With this change, if no realm is specified in an outbound auth
section, then we will simply match the realm that was present
in the 401/407 challenge.

(closes issue ASTERISK-22471)
Reported by George Joseph
(closes issue ASTERISK-22386)
Reported by Rusty Newton

Patches:
	outbound_auth_realm_v4.patch uploaded by George Joseph (License #6322)
........

Merged revisions 399059 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@399082 65c4cc65-6c06-0410-ace0-fbb531ad65f3

res/res_pjsip/config_auth.c

@@ -117,7 +117,7 @@ int ast_sip_initialize_sorcery_auth(struct ast_sorcery *sorcery)
 	ast_sorcery_object_field_register(sorcery, SIP_SORCERY_AUTH_TYPE, "md5_cred",
 			"", OPT_STRINGFIELD_T, 0, STRFLDSET(struct ast_sip_auth, md5_creds));
 	ast_sorcery_object_field_register(sorcery, SIP_SORCERY_AUTH_TYPE, "realm",
-			"asterisk", OPT_STRINGFIELD_T, 0, STRFLDSET(struct ast_sip_auth, realm));
+			"", OPT_STRINGFIELD_T, 0, STRFLDSET(struct ast_sip_auth, realm));
 	ast_sorcery_object_field_register(sorcery, SIP_SORCERY_AUTH_TYPE, "nonce_lifetime",
 			"32", OPT_UINT_T, 0, FLDSET(struct ast_sip_auth, nonce_lifetime));
 	ast_sorcery_object_field_register_custom(sorcery, SIP_SORCERY_AUTH_TYPE, "auth_type",

res/res_pjsip_authenticator_digest.c

@@ -395,6 +395,9 @@ static enum ast_sip_check_auth_result digest_check_auth(struct ast_sip_endpoint
 	}
 
 	for (i = 0; i < endpoint->inbound_auths.num; ++i) {
+		if (ast_strlen_zero(auths[i]->realm)) {
+			ast_string_field_set(auths[i], realm, "asterisk");
+		}
 		verify_res[i] = verify(auths[i], rdata, tdata->pool);
 		if (verify_res[i] == AUTH_SUCCESS) {
 			res = AST_SIP_AUTHENTICATION_SUCCESS;

res/res_pjsip_outbound_authenticator_digest.c

@@ -31,10 +31,30 @@
 #include "asterisk/module.h"
 #include "asterisk/strings.h"
 
-static int set_outbound_authentication_credentials(pjsip_auth_clt_sess *auth_sess, const struct ast_sip_auth_array *array)
+static pjsip_www_authenticate_hdr *get_auth_header(pjsip_rx_data *challenge) {
+	pjsip_hdr_e search_type;
+
+	if (challenge->msg_info.msg->line.status.code == PJSIP_SC_UNAUTHORIZED) {
+		search_type = PJSIP_H_WWW_AUTHENTICATE;
+	} else if (challenge->msg_info.msg->line.status.code == PJSIP_SC_PROXY_AUTHENTICATION_REQUIRED) {
+		search_type = PJSIP_H_PROXY_AUTHENTICATE;
+	} else {
+		ast_log(LOG_ERROR,
+				"Status code %d was received when it should have been 401 or 407.\n",
+				challenge->msg_info.msg->line.status.code);
+		return NULL ;
+	}
+
+	return pjsip_msg_find_hdr(challenge->msg_info.msg, search_type, NULL);
+
+}
+
+static int set_outbound_authentication_credentials(pjsip_auth_clt_sess *auth_sess,
+		const struct ast_sip_auth_array *array, pjsip_rx_data *challenge)
 {
 	struct ast_sip_auth **auths = ast_alloca(array->num * sizeof(*auths));
 	pjsip_cred_info *auth_creds = ast_alloca(array->num * sizeof(*auth_creds));
+	pjsip_www_authenticate_hdr *auth_hdr = NULL;
 	int res = 0;
 	int i;
 
@@ -43,8 +63,19 @@ static int set_outbound_authentication_credentials(pjsip_auth_clt_sess *auth_ses
 		goto cleanup;
 	}
 
+	auth_hdr = get_auth_header(challenge);
+	if (auth_hdr == NULL) {
+		res = -1;
+		ast_log(LOG_ERROR, "Unable to find authenticate header in challenge.\n");
+		goto cleanup;
+	}
+
 	for (i = 0; i < array->num; ++i) {
+		if (ast_strlen_zero(auths[i]->realm)) {
+			pj_cstr(&auth_creds[i].realm, auth_hdr->challenge.common.realm.ptr);
+		} else {
 			pj_cstr(&auth_creds[i].realm, auths[i]->realm);
+		}
 		pj_cstr(&auth_creds[i].username, auths[i]->auth_user);
 		pj_cstr(&auth_creds[i].scheme, "digest");
 		switch (auths[i]->type) {
@@ -80,7 +111,7 @@ static int digest_create_request_with_auth(const struct ast_sip_auth_array *auth
 		return -1;
 	}
 
-	if (set_outbound_authentication_credentials(&auth_sess, auths)) {
+	if (set_outbound_authentication_credentials(&auth_sess, auths, challenge)) {
 		ast_log(LOG_WARNING, "Failed to set authentication credentials\n");
 		return -1;
 	}