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/**
* $Id$
* @file validate.c
* @brief Authentication for yubikey OTP tokens using the ykclient library.
*
* @author Arran Cudbard-Bell <a.cudbardb@networkradius.com>
* @copyright 2013 The FreeRADIUS server project
* @copyright 2013 Network RADIUS <info@networkradius.com>
*/
#include "rlm_yubikey.h"
#ifdef HAVE_YKCLIENT
#include <freeradius-devel/connection.h>
/** Frees a ykclient handle
*
* @param[in] yandle rlm_yubikey_handle_t to close and free.
* @return returns 0.
*/
static int _mod_conn_free(ykclient_handle_t **yandle)
{
ykclient_handle_done(yandle);
return 0;
}
/** Creates a new connection handle for use by the FR connection API.
*
* Matches the fr_connection_create_t function prototype, is passed to
* fr_connection_pool_init, and called when a new connection is required by the
* connection pool API.
*
* @see fr_connection_pool_init
* @see fr_connection_create_t
* @see connection.c
*/
static void *mod_conn_create(TALLOC_CTX *ctx, void *instance)
{
rlm_yubikey_t *inst = instance;
ykclient_rc status;
ykclient_handle_t *yandle, **marker;
status = ykclient_handle_init(inst->ykc, &yandle);
if (status != YKCLIENT_OK) {
ERROR("rlm_yubikey (%s): %s", inst->name, ykclient_strerror(status));
return NULL;
}
marker = talloc(ctx, ykclient_handle_t *);
talloc_set_destructor(marker, _mod_conn_free);
*marker = yandle;
return yandle;
}
int rlm_yubikey_ykclient_init(CONF_SECTION *conf, rlm_yubikey_t *inst)
{
ykclient_rc status;
CONF_SECTION *servers;
char prefix[100];
int count = 0;
if (!inst->client_id) {
ERROR("rlm_yubikey (%s): validation.client_id must be set (to a valid id) when validation is enabled",
inst->name);
return -1;
}
if (!inst->api_key || !*inst->api_key || is_zero(inst->api_key)) {
ERROR("rlm_yubikey (%s): validation.api_key must be set (to a valid key) when validation is enabled",
inst->name);
return -1;
}
DEBUG("rlm_yubikey (%s): Initialising ykclient", inst->name);
status = ykclient_global_init();
if (status != YKCLIENT_OK) {
yk_error:
ERROR("rlm_yubikey (%s): %s", ykclient_strerror(status), inst->name);
return -1;
}
status = ykclient_init(&inst->ykc);
if (status != YKCLIENT_OK) {
goto yk_error;
}
servers = cf_section_sub_find(conf, "servers");
if (servers) {
CONF_PAIR *uri, *first;
/*
* If there were no uris configured we just use the default
* ykclient uris which point to the yubico servers.
*/
first = uri = cf_pair_find(servers, "uri");
if (!uri) {
goto init;
}
while (uri) {
count++;
uri = cf_pair_find_next(servers, uri, "uri");
}
inst->uris = talloc_zero_array(inst, char const *, count);
uri = first;
count = 0;
while (uri) {
inst->uris[count++] = cf_pair_value(uri);
uri = cf_pair_find_next(servers, uri, "uri");
}
if (count) {
status = ykclient_set_url_templates(inst->ykc, count, inst->uris);
if (status != YKCLIENT_OK) {
goto yk_error;
}
}
}
init:
status = ykclient_set_client_b64(inst->ykc, inst->client_id, inst->api_key);
if (status != YKCLIENT_OK) {
ERROR("rlm_yubikey (%s): Failed setting API credentials: %s", ykclient_strerror(status), inst->name);
return -1;
}
snprintf(prefix, sizeof(prefix), "rlm_yubikey (%s)", inst->name);
inst->pool = fr_connection_pool_module_init(conf, inst, mod_conn_create, NULL, prefix);
if (!inst->pool) {
ykclient_done(&inst->ykc);
return -1;
}
return 0;
}
int rlm_yubikey_ykclient_detach(rlm_yubikey_t *inst)
{
fr_connection_pool_free(inst->pool);
ykclient_done(&inst->ykc);
ykclient_global_done();
return 0;
}
rlm_rcode_t rlm_yubikey_validate(rlm_yubikey_t *inst, REQUEST *request, char const *passcode)
{
rlm_rcode_t rcode = RLM_MODULE_OK;
ykclient_rc status;
ykclient_handle_t *yandle;
yandle = fr_connection_get(inst->pool);
if (!yandle) return RLM_MODULE_FAIL;
/*
* The libcurl multi-handle interface will tear down the TCP sockets for any partially completed
* requests when their easy handle is removed from the multistack.
*
* For performance reasons ykclient will stop processing the request immediately after receiving
* a response from one of the servers. If we then immediately call ykclient_handle_cleanup
* the connections are destroyed and will need to be re-established the next time the handle
* is used.
*
* To try and prevent this from happening, we leave cleanup until the *next* time
* the handle is used, by which time the requests will of hopefully completed and the connections
* can be re-used.
*
*/
ykclient_handle_cleanup(yandle);
status = ykclient_request_process(inst->ykc, yandle, passcode);
if (status != YKCLIENT_OK) {
REDEBUG("%s", ykclient_strerror(status));
switch (status) {
case YKCLIENT_BAD_OTP:
case YKCLIENT_REPLAYED_OTP:
rcode = RLM_MODULE_REJECT;
break;
case YKCLIENT_NO_SUCH_CLIENT:
rcode = RLM_MODULE_NOTFOUND;
break;
default:
rcode = RLM_MODULE_FAIL;
}
}
fr_connection_release(inst->pool, yandle);
return rcode;
}
#endif
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