asterisk/res/res_pjsip/config_auth.c

/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 2013, Digium, Inc.
 *
 * Mark Michelson <mmichelson@digium.com>
 *
 * See http://www.asterisk.org for more information about
 * the Asterisk project. Please do not directly contact
 * any of the maintainers of this project for assistance;
 * the project provides a web site, mailing lists and IRC
 * channels for your use.
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License Version 2. See the LICENSE file
 * at the top of the source tree.
 */

#include "asterisk.h"

#include <pjsip.h>
#include <pjlib.h>
#include "asterisk/res_pjsip.h"
#include "asterisk/logger.h"
#include "asterisk/sorcery.h"
#include "include/res_pjsip_private.h"

static void auth_destroy(void *obj)
{
	struct ast_sip_auth *auth = obj;
	ast_string_field_free_memory(auth);
}

static void *auth_alloc(const char *name)
{
	struct ast_sip_auth *auth = ast_sorcery_generic_alloc(sizeof(*auth), auth_destroy);

	if (!auth) {
		return NULL;
	}

	if (ast_string_field_init(auth, 64)) {
		ao2_cleanup(auth);
		return NULL;
	}

	return auth;
}

static int auth_type_handler(const struct aco_option *opt, struct ast_variable *var, void *obj)
{
	struct ast_sip_auth *auth = obj;
	if (!strcasecmp(var->value, "userpass")) {
		auth->type = AST_SIP_AUTH_TYPE_USER_PASS;
	} else if (!strcasecmp(var->value, "md5")) {
		auth->type = AST_SIP_AUTH_TYPE_MD5;
	} else {
		ast_log(LOG_WARNING, "Unknown authentication storage type '%s' specified for %s\n",
				var->value, var->name);
		return -1;
	}
	return 0;
}

static const char *auth_types_map[] = {
	[AST_SIP_AUTH_TYPE_USER_PASS] = "userpass",
	[AST_SIP_AUTH_TYPE_MD5] = "md5"
};

const char *ast_sip_auth_type_to_str(enum ast_sip_auth_type type)
{
	return ARRAY_IN_BOUNDS(type, auth_types_map) ?
		auth_types_map[type] : "";
}

static int auth_type_to_str(const void *obj, const intptr_t *args, char **buf)
{
	const struct ast_sip_auth *auth = obj;
	*buf = ast_strdup(ast_sip_auth_type_to_str(auth->type));
	return 0;
}

static int auth_apply(const struct ast_sorcery *sorcery, void *obj)
{
	struct ast_sip_auth *auth = obj;
	int res = 0;

	if (ast_strlen_zero(auth->auth_user)) {
		ast_log(LOG_ERROR, "No authentication username for auth '%s'\n",
				ast_sorcery_object_get_id(auth));
		return -1;
	}

	switch (auth->type) {
	case AST_SIP_AUTH_TYPE_USER_PASS:
		if (ast_strlen_zero(auth->auth_pass)) {
			ast_log(LOG_ERROR, "'userpass' authentication specified but no"
					"password specified for auth '%s'\n", ast_sorcery_object_get_id(auth));
			res = -1;
		}
		break;
	case AST_SIP_AUTH_TYPE_MD5:
		if (ast_strlen_zero(auth->md5_creds)) {
			ast_log(LOG_ERROR, "'md5' authentication specified but no md5_cred"
					"specified for auth '%s'\n", ast_sorcery_object_get_id(auth));
			res = -1;
		} else if (strlen(auth->md5_creds) != PJSIP_MD5STRLEN) {
			ast_log(LOG_ERROR, "'md5' authentication requires digest of size '%d', but"
				"digest is '%d' in size for auth '%s'\n", PJSIP_MD5STRLEN, (int)strlen(auth->md5_creds),
				ast_sorcery_object_get_id(auth));
			res = -1;
		}
		break;
	case AST_SIP_AUTH_TYPE_ARTIFICIAL:
		break;
	}

	return res;
}

int ast_sip_for_each_auth(const struct ast_sip_auth_array *array,
			  ao2_callback_fn on_auth, void *arg)
{
	int i;

	if (!array || !array->num) {
		return 0;
	}

	for (i = 0; i < array->num; ++i) {
		RAII_VAR(struct ast_sip_auth *, auth, ast_sorcery_retrieve_by_id(
				 ast_sip_get_sorcery(), SIP_SORCERY_AUTH_TYPE,
				 array->names[i]), ao2_cleanup);

		if (!auth) {
			continue;
		}

		if (on_auth(auth, arg, 0)) {
			return -1;
		}
	}

	return 0;
}

static int sip_auth_to_ami(const struct ast_sip_auth *auth,
			   struct ast_str **buf)
{
	return ast_sip_sorcery_object_to_ami(auth, buf);
}

static int format_ami_auth_handler(void *obj, void *arg, int flags)
{
	const struct ast_sip_auth *auth = obj;
	struct ast_sip_ami *ami = arg;
	const struct ast_sip_endpoint *endpoint = ami->arg;
	RAII_VAR(struct ast_str *, buf,
		 ast_sip_create_ami_event("AuthDetail", ami), ast_free);

	if (!buf) {
		return -1;
	}

	if (sip_auth_to_ami(auth, &buf)) {
		return -1;
	}

	if (endpoint) {
		ast_str_append(&buf, 0, "EndpointName: %s\r\n",
		       ast_sorcery_object_get_id(endpoint));
	}

	astman_append(ami->s, "%s\r\n", ast_str_buffer(buf));
	return 0;
}

int ast_sip_format_auths_ami(const struct ast_sip_auth_array *auths,
			     struct ast_sip_ami *ami)
{
	return ast_sip_for_each_auth(auths, format_ami_auth_handler, ami);
}

static int format_ami_endpoint_auth(const struct ast_sip_endpoint *endpoint,
				    struct ast_sip_ami *ami)
{
	ami->arg = (void *)endpoint;
	if (ast_sip_format_auths_ami(&endpoint->inbound_auths, ami)) {
		return -1;
	}

	return ast_sip_format_auths_ami(&endpoint->outbound_auths, ami);
}

static struct ast_sip_endpoint_formatter endpoint_auth_formatter = {
	.format_ami = format_ami_endpoint_auth
};

/*! \brief Initialize sorcery with auth support */
int ast_sip_initialize_sorcery_auth(struct ast_sorcery *sorcery)
{
	ast_sorcery_apply_default(sorcery, SIP_SORCERY_AUTH_TYPE, "config", "pjsip.conf,criteria=type=auth");

	if (ast_sorcery_object_register(sorcery, SIP_SORCERY_AUTH_TYPE, auth_alloc, NULL, auth_apply)) {
		return -1;
	}

	ast_sorcery_object_field_register(sorcery, SIP_SORCERY_AUTH_TYPE, "type", "",
			OPT_NOOP_T, 0, 0);
	ast_sorcery_object_field_register(sorcery, SIP_SORCERY_AUTH_TYPE, "username",
			"", OPT_STRINGFIELD_T, 0, STRFLDSET(struct ast_sip_auth, auth_user));
	ast_sorcery_object_field_register(sorcery, SIP_SORCERY_AUTH_TYPE, "password",
			"", OPT_STRINGFIELD_T, 0, STRFLDSET(struct ast_sip_auth, auth_pass));
	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",
			"", 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",
			"userpass", auth_type_handler, auth_type_to_str, 0, 0);

	ast_sip_register_endpoint_formatter(&endpoint_auth_formatter);
	return 0;
}