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/* CLI (command line interface) common methods
*
* Copyright (c) 2020, Redis Labs
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Redis nor the names of its contributors may be used
* to endorse or promote products derived from this software without
* specific prior written permission.
*
* 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.
*/
#include "cli_common.h"
#include <errno.h>
#include <hiredis.h>
#include <sdscompat.h> /* Use hiredis' sds compat header that maps sds calls to their hi_ variants */
#include <sds.h> /* use sds.h from hiredis, so that only one set of sds functions will be present in the binary */
#ifdef USE_OPENSSL
#include <openssl/ssl.h>
#include <openssl/err.h>
#include <hiredis_ssl.h>
#endif
/* Wrapper around redisSecureConnection to avoid hiredis_ssl dependencies if
* not building with TLS support.
*/
int cliSecureConnection(redisContext *c, cliSSLconfig config, const char **err) {
#ifdef USE_OPENSSL
static SSL_CTX *ssl_ctx = NULL;
if (!ssl_ctx) {
ssl_ctx = SSL_CTX_new(SSLv23_client_method());
if (!ssl_ctx) {
*err = "Failed to create SSL_CTX";
goto error;
}
SSL_CTX_set_options(ssl_ctx, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3);
SSL_CTX_set_verify(ssl_ctx, SSL_VERIFY_PEER, NULL);
if (config.cacert || config.cacertdir) {
if (!SSL_CTX_load_verify_locations(ssl_ctx, config.cacert, config.cacertdir)) {
*err = "Invalid CA Certificate File/Directory";
goto error;
}
} else {
if (!SSL_CTX_set_default_verify_paths(ssl_ctx)) {
*err = "Failed to use default CA paths";
goto error;
}
}
if (config.cert && !SSL_CTX_use_certificate_chain_file(ssl_ctx, config.cert)) {
*err = "Invalid client certificate";
goto error;
}
if (config.key && !SSL_CTX_use_PrivateKey_file(ssl_ctx, config.key, SSL_FILETYPE_PEM)) {
*err = "Invalid private key";
goto error;
}
}
SSL *ssl = SSL_new(ssl_ctx);
if (!ssl) {
*err = "Failed to create SSL object";
return REDIS_ERR;
}
if (config.sni && !SSL_set_tlsext_host_name(ssl, config.sni)) {
*err = "Failed to configure SNI";
SSL_free(ssl);
return REDIS_ERR;
}
return redisInitiateSSL(c, ssl);
error:
SSL_CTX_free(ssl_ctx);
ssl_ctx = NULL;
return REDIS_ERR;
#else
(void) config;
(void) c;
(void) err;
return REDIS_OK;
#endif
}
/* Wrapper around hiredis to allow arbitrary reads and writes.
*
* We piggybacks on top of hiredis to achieve transparent TLS support,
* and use its internal buffers so it can co-exist with commands
* previously/later issued on the connection.
*
* Interface is close to enough to read()/write() so things should mostly
* work transparently.
*/
/* Write a raw buffer through a redisContext. If we already have something
* in the buffer (leftovers from hiredis operations) it will be written
* as well.
*/
ssize_t cliWriteConn(redisContext *c, const char *buf, size_t buf_len)
{
int done = 0;
/* Append data to buffer which is *usually* expected to be empty
* but we don't assume that, and write.
*/
c->obuf = sdscatlen(c->obuf, buf, buf_len);
if (redisBufferWrite(c, &done) == REDIS_ERR) {
if (!(c->flags & REDIS_BLOCK))
errno = EAGAIN;
/* On error, we assume nothing was written and we roll back the
* buffer to its original state.
*/
if (sdslen(c->obuf) > buf_len)
sdsrange(c->obuf, 0, -(buf_len+1));
else
sdsclear(c->obuf);
return -1;
}
/* If we're done, free up everything. We may have written more than
* buf_len (if c->obuf was not initially empty) but we don't have to
* tell.
*/
if (done) {
sdsclear(c->obuf);
return buf_len;
}
/* Write was successful but we have some leftovers which we should
* remove from the buffer.
*
* Do we still have data that was there prior to our buf? If so,
* restore buffer to it's original state and report no new data was
* writen.
*/
if (sdslen(c->obuf) > buf_len) {
sdsrange(c->obuf, 0, -(buf_len+1));
return 0;
}
/* At this point we're sure no prior data is left. We flush the buffer
* and report how much we've written.
*/
size_t left = sdslen(c->obuf);
sdsclear(c->obuf);
return buf_len - left;
}
/* Wrapper around OpenSSL (libssl and libcrypto) initialisation
*/
int cliSecureInit()
{
#ifdef USE_OPENSSL
ERR_load_crypto_strings();
SSL_load_error_strings();
SSL_library_init();
#endif
return REDIS_OK;
}
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