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/*
* librdkafka - The Apache Kafka C/C++ library
*
* Copyright (c) 2017 Magnus Edenhill
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/**
* Builtin SASL PLAIN support when Cyrus SASL is not available
*/
#include "rdkafka_int.h"
#include "rdkafka_transport.h"
#include "rdkafka_transport_int.h"
#include "rdkafka_sasl.h"
#include "rdkafka_sasl_int.h"
/**
* @brief Handle received frame from broker.
*/
static int rd_kafka_sasl_plain_recv(struct rd_kafka_transport_s *rktrans,
const void *buf,
size_t size,
char *errstr,
size_t errstr_size) {
if (size)
rd_rkb_dbg(rktrans->rktrans_rkb, SECURITY, "SASLPLAIN",
"Received non-empty SASL PLAIN (builtin) "
"response from broker (%" PRIusz " bytes)",
size);
rd_kafka_sasl_auth_done(rktrans);
return 0;
}
/**
* @brief Initialize and start SASL PLAIN (builtin) authentication.
*
* Returns 0 on successful init and -1 on error.
*
* @locality broker thread
*/
int rd_kafka_sasl_plain_client_new(rd_kafka_transport_t *rktrans,
const char *hostname,
char *errstr,
size_t errstr_size) {
rd_kafka_broker_t *rkb = rktrans->rktrans_rkb;
rd_kafka_t *rk = rkb->rkb_rk;
/* [authzid] UTF8NUL authcid UTF8NUL passwd */
char *buf;
int of = 0;
int zidlen = 0;
int cidlen, pwlen;
mtx_lock(&rk->rk_conf.sasl.lock);
cidlen = rk->rk_conf.sasl.username
? (int)strlen(rk->rk_conf.sasl.username)
: 0;
pwlen = rk->rk_conf.sasl.password
? (int)strlen(rk->rk_conf.sasl.password)
: 0;
buf = rd_alloca(zidlen + 1 + cidlen + 1 + pwlen + 1);
/* authzid: none (empty) */
/* UTF8NUL */
buf[of++] = 0;
/* authcid */
memcpy(&buf[of], rk->rk_conf.sasl.username, cidlen);
of += cidlen;
/* UTF8NUL */
buf[of++] = 0;
/* passwd */
memcpy(&buf[of], rk->rk_conf.sasl.password, pwlen);
of += pwlen;
mtx_unlock(&rk->rk_conf.sasl.lock);
rd_rkb_dbg(rkb, SECURITY, "SASLPLAIN",
"Sending SASL PLAIN (builtin) authentication token");
if (rd_kafka_sasl_send(rktrans, buf, of, errstr, errstr_size))
return -1;
/* PLAIN is appearantly done here, but we still need to make sure
* the PLAIN frame is sent and we get a response back (empty) */
rktrans->rktrans_sasl.complete = 1;
return 0;
}
/**
* @brief Validate PLAIN config
*/
static int rd_kafka_sasl_plain_conf_validate(rd_kafka_t *rk,
char *errstr,
size_t errstr_size) {
rd_bool_t both_set;
mtx_lock(&rk->rk_conf.sasl.lock);
both_set = rk->rk_conf.sasl.username && rk->rk_conf.sasl.password;
mtx_unlock(&rk->rk_conf.sasl.lock);
if (!both_set) {
rd_snprintf(errstr, errstr_size,
"sasl.username and sasl.password must be set");
return -1;
}
return 0;
}
const struct rd_kafka_sasl_provider rd_kafka_sasl_plain_provider = {
.name = "PLAIN (builtin)",
.client_new = rd_kafka_sasl_plain_client_new,
.recv = rd_kafka_sasl_plain_recv,
.conf_validate = rd_kafka_sasl_plain_conf_validate};
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