597 lines
15 KiB
C
597 lines
15 KiB
C
/*! \file ssl/ssl_conf.c
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* \brief SSL configuration functions
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*/
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/* ====================================================================
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* Copyright (c) 2012 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* openssl-core@openssl.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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#ifdef REF_CHECK
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# include <assert.h>
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#endif
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#include <stdio.h>
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#include "ssl_locl.h"
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#include <openssl/conf.h>
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#include <openssl/objects.h>
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/* structure holding name tables. This is used for pemitted elements in
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* lists such as TLSv1 and single command line switches such as no_tls1
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*/
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typedef struct
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{
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const char *name;
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int namelen;
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unsigned int name_flags;
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unsigned long option_value;
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} ssl_flag_tbl;
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/* Sense of name is inverted e.g. "TLSv1" will clear SSL_OP_NO_TLSv1 */
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#define SSL_TFLAG_INV 0x1
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/* Flags refers to cert_flags not options */
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#define SSL_TFLAG_CERT 0x2
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/* Option can only be used for clients */
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#define SSL_TFLAG_CLIENT SSL_CONF_FLAG_CLIENT
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/* Option can only be used for servers */
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#define SSL_TFLAG_SERVER SSL_CONF_FLAG_SERVER
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#define SSL_TFLAG_BOTH (SSL_TFLAG_CLIENT|SSL_TFLAG_SERVER)
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#define SSL_FLAG_TBL(str, flag) \
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{str, (int)(sizeof(str) - 1), SSL_TFLAG_BOTH, flag}
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#define SSL_FLAG_TBL_SRV(str, flag) \
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{str, (int)(sizeof(str) - 1), SSL_TFLAG_SERVER, flag}
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#define SSL_FLAG_TBL_CLI(str, flag) \
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{str, (int)(sizeof(str) - 1), SSL_TFLAG_CLIENT, flag}
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#define SSL_FLAG_TBL_INV(str, flag) \
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{str, (int)(sizeof(str) - 1), SSL_TFLAG_INV|SSL_TFLAG_BOTH, flag}
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#define SSL_FLAG_TBL_SRV_INV(str, flag) \
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{str, (int)(sizeof(str) - 1), SSL_TFLAG_INV|SSL_TFLAG_SERVER, flag}
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#define SSL_FLAG_TBL_CERT(str, flag) \
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{str, (int)(sizeof(str) - 1), SSL_TFLAG_CERT|SSL_TFLAG_BOTH, flag}
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/* Opaque structure containing SSL configuration context.
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*/
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struct ssl_conf_ctx_st
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{
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/* Various flags indicating (among other things) which options we
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* will recognise.
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*/
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unsigned int flags;
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/* Prefix and length of commands */
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char *prefix;
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size_t prefixlen;
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/* SSL_CTX or SSL structure to perform operations on */
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SSL_CTX *ctx;
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SSL *ssl;
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/* Pointer to SSL or SSL_CTX options field or NULL if none */
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unsigned long *poptions;
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/* Pointer to SSL or SSL_CTX cert_flags or NULL if none */
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unsigned int *pcert_flags;
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/* Current flag table being worked on */
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const ssl_flag_tbl *tbl;
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/* Size of table */
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size_t ntbl;
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};
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static int ssl_match_option(SSL_CONF_CTX *cctx, const ssl_flag_tbl *tbl,
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const char *name, int namelen, int onoff)
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{
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/* If name not relevant for context skip */
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if (!(cctx->flags & tbl->name_flags & SSL_TFLAG_BOTH))
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return 0;
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if (namelen == -1)
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{
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if (strcmp(tbl->name, name))
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return 0;
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}
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else if (tbl->namelen != namelen || strncasecmp(tbl->name, name, namelen))
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return 0;
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if (cctx->poptions)
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{
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if (tbl->name_flags & SSL_TFLAG_INV)
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onoff ^= 1;
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if (tbl->name_flags & SSL_TFLAG_CERT)
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{
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if (onoff)
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*cctx->pcert_flags |= tbl->option_value;
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else
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*cctx->pcert_flags &= ~tbl->option_value;
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}
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else
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{
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if (onoff)
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*cctx->poptions |= tbl->option_value;
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else
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*cctx->poptions &= ~tbl->option_value;
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}
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}
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return 1;
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}
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static int ssl_set_option_list(const char *elem, int len, void *usr)
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{
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SSL_CONF_CTX *cctx = usr;
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size_t i;
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const ssl_flag_tbl *tbl;
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int onoff = 1;
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/* len == -1 indicates not being called in list context, just for
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* single command line switches, so don't allow +, -.
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*/
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if (len != -1)
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{
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if (*elem == '+')
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{
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elem++;
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len--;
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onoff = 1;
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}
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else if (*elem == '-')
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{
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elem++;
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len--;
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onoff = 0;
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}
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}
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for (i = 0, tbl = cctx->tbl; i < cctx->ntbl; i++, tbl++)
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{
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if (ssl_match_option(cctx, tbl, elem, len, onoff))
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return 1;
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}
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return 0;
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}
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/* Single command line switches with no argument e.g. -no_ssl3 */
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static int ctrl_str_option(SSL_CONF_CTX *cctx, const char *cmd)
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{
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static const ssl_flag_tbl ssl_option_single[] =
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{
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SSL_FLAG_TBL("no_ssl2", SSL_OP_NO_SSLv2),
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SSL_FLAG_TBL("no_ssl3", SSL_OP_NO_SSLv3),
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SSL_FLAG_TBL("no_tls1", SSL_OP_NO_TLSv1),
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SSL_FLAG_TBL("no_tls1_1", SSL_OP_NO_TLSv1_1),
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SSL_FLAG_TBL("no_tls1_2", SSL_OP_NO_TLSv1_2),
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SSL_FLAG_TBL("no_tls1_2", SSL_OP_NO_TLSv1_2),
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SSL_FLAG_TBL("bugs", SSL_OP_ALL),
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SSL_FLAG_TBL("no_comp", SSL_OP_NO_COMPRESSION),
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#ifndef OPENSSL_NO_TLSEXT
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SSL_FLAG_TBL("no_ticket", SSL_OP_NO_TICKET),
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#endif
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SSL_FLAG_TBL_SRV("serverpref", SSL_OP_CIPHER_SERVER_PREFERENCE),
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SSL_FLAG_TBL("legacy_renegotiation", SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION),
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SSL_FLAG_TBL_SRV("legacy_server_connect", SSL_OP_LEGACY_SERVER_CONNECT),
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SSL_FLAG_TBL_SRV_INV("no_legacy_server_connect", SSL_OP_LEGACY_SERVER_CONNECT),
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SSL_FLAG_TBL_CERT("strict", SSL_CERT_FLAG_TLS_STRICT),
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#ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
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SSL_FLAG_TBL_CERT("debug_broken_protocol", SSL_CERT_FLAG_BROKEN_PROTOCOL),
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#endif
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};
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cctx->tbl = ssl_option_single;
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cctx->ntbl = sizeof(ssl_option_single)/sizeof(ssl_flag_tbl);
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return ssl_set_option_list(cmd, -1, cctx);
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}
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/* Set supported signature algorithms */
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static int cmd_sigalgs(SSL_CONF_CTX *cctx, const char *value)
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{
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int rv;
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if (cctx->ssl)
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rv = SSL_set1_sigalgs_list(cctx->ssl, value);
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/* NB: ctx == NULL performs syntax checking only */
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else
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rv = SSL_CTX_set1_sigalgs_list(cctx->ctx, value);
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return rv > 0;
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}
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/* Set supported client signature algorithms */
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static int cmd_client_sigalgs(SSL_CONF_CTX *cctx, const char *value)
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{
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int rv;
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if (cctx->ssl)
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rv = SSL_set1_client_sigalgs_list(cctx->ssl, value);
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/* NB: ctx == NULL performs syntax checking only */
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else
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rv = SSL_CTX_set1_client_sigalgs_list(cctx->ctx, value);
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return rv > 0;
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}
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static int cmd_curves(SSL_CONF_CTX *cctx, const char *value)
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{
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int rv;
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if (cctx->ssl)
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rv = SSL_set1_curves_list(cctx->ssl, value);
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/* NB: ctx == NULL performs syntax checking only */
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else
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rv = SSL_CTX_set1_curves_list(cctx->ctx, value);
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return rv > 0;
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}
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#ifndef OPENSSL_NO_ECDH
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/* ECDH temporary parameters */
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static int cmd_ecdhparam(SSL_CONF_CTX *cctx, const char *value)
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{
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int onoff = -1, rv = 1;
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if (!(cctx->flags & SSL_CONF_FLAG_SERVER))
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return -2;
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if (cctx->flags & SSL_CONF_FLAG_FILE)
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{
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if (*value == '+')
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{
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onoff = 1;
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value++;
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}
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if (*value == '-')
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{
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onoff = 0;
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value++;
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}
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if (!strcasecmp(value, "automatic"))
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{
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if (onoff == -1)
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onoff = 1;
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}
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else if (onoff != -1)
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return 0;
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}
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else if (cctx->flags & SSL_CONF_FLAG_CMDLINE)
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{
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if (!strcmp(value, "auto"))
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onoff = 1;
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}
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if (onoff != -1)
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{
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if (cctx->ctx)
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rv = SSL_CTX_set_ecdh_auto(cctx->ctx, onoff);
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else if (cctx->ssl)
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rv = SSL_set_ecdh_auto(cctx->ssl, onoff);
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}
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else
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{
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EC_KEY *ecdh;
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int nid;
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nid = EC_curve_nist2nid(value);
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if (nid == NID_undef)
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nid = OBJ_sn2nid(value);
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if (nid == 0)
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return 0;
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ecdh = EC_KEY_new_by_curve_name(nid);
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if (!ecdh)
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return 0;
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if (cctx->ctx)
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rv = SSL_CTX_set_tmp_ecdh(cctx->ctx, ecdh);
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else if (cctx->ssl)
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rv = SSL_set_tmp_ecdh(cctx->ssl, ecdh);
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EC_KEY_free(ecdh);
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}
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return rv > 0;
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}
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#endif
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static int cmd_cipher_list(SSL_CONF_CTX *cctx, const char *value)
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{
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int rv = 1;
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if (cctx->ctx)
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rv = SSL_CTX_set_cipher_list(cctx->ctx, value);
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if (cctx->ssl)
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rv = SSL_set_cipher_list(cctx->ssl, value);
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return rv > 0;
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}
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static int cmd_protocol(SSL_CONF_CTX *cctx, const char *value)
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{
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static const ssl_flag_tbl ssl_protocol_list[] =
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{
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SSL_FLAG_TBL_INV("ALL", SSL_OP_NO_SSL_MASK),
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SSL_FLAG_TBL_INV("SSLv2", SSL_OP_NO_SSLv2),
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SSL_FLAG_TBL_INV("SSLv3", SSL_OP_NO_SSLv3),
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SSL_FLAG_TBL_INV("TLSv1", SSL_OP_NO_TLSv1),
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SSL_FLAG_TBL_INV("TLSv1.1", SSL_OP_NO_TLSv1_1),
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SSL_FLAG_TBL_INV("TLSv1.2", SSL_OP_NO_TLSv1_2)
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};
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if (!(cctx->flags & SSL_CONF_FLAG_FILE))
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return -2;
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cctx->tbl = ssl_protocol_list;
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cctx->ntbl = sizeof(ssl_protocol_list)/sizeof(ssl_flag_tbl);
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return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
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}
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static int cmd_options(SSL_CONF_CTX *cctx, const char *value)
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{
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static const ssl_flag_tbl ssl_option_list[] =
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{
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SSL_FLAG_TBL_INV("SessionTicket", SSL_OP_NO_TICKET),
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SSL_FLAG_TBL_INV("EmptyFragments", SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS),
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SSL_FLAG_TBL("Bugs", SSL_OP_ALL),
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SSL_FLAG_TBL_INV("Compression", SSL_OP_NO_COMPRESSION),
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SSL_FLAG_TBL_SRV("ServerPreference", SSL_OP_CIPHER_SERVER_PREFERENCE),
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SSL_FLAG_TBL_SRV("DHSingle", SSL_OP_SINGLE_DH_USE),
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SSL_FLAG_TBL_SRV("ECDHSingle", SSL_OP_SINGLE_ECDH_USE),
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SSL_FLAG_TBL("UnsafeLegacyRenegotiation", SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION),
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};
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if (!(cctx->flags & SSL_CONF_FLAG_FILE))
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return -2;
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if (value == NULL)
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return -3;
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cctx->tbl = ssl_option_list;
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cctx->ntbl = sizeof(ssl_option_list)/sizeof(ssl_flag_tbl);
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return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
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}
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typedef struct
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{
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int (*cmd)(SSL_CONF_CTX *cctx, const char *value);
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const char *str_file;
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const char *str_cmdline;
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} ssl_conf_cmd_tbl;
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/* Table of supported patameters */
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static ssl_conf_cmd_tbl ssl_conf_cmds[] = {
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{cmd_sigalgs, "SignatureAlgorithms", "sigalgs"},
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{cmd_client_sigalgs, "ClientSignatureAlgorithms", "client_sigalgs"},
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{cmd_curves, "Curves", "curves"},
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#ifndef OPENSSL_NO_ECDH
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{cmd_ecdhparam, "ECDHParameters", "named_curve"},
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#endif
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{cmd_cipher_list, "CipherString", "cipher"},
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{cmd_protocol, "Protocol", NULL},
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{cmd_options, "Options", NULL},
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};
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int SSL_CONF_cmd(SSL_CONF_CTX *cctx, const char *cmd, const char *value)
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{
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ssl_conf_cmd_tbl *t, *runcmd = NULL;
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size_t i;
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if (cmd == NULL)
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{
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SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_INVALID_NULL_CMD_NAME);
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return 0;
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}
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/* If a prefix is set, check and skip */
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if (cctx->prefix)
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{
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if (strlen(cmd) <= cctx->prefixlen)
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return -2;
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if (cctx->flags & SSL_CONF_FLAG_CMDLINE &&
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strncmp(cmd, cctx->prefix, cctx->prefixlen))
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return -2;
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if (cctx->flags & SSL_CONF_FLAG_FILE &&
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strncasecmp(cmd, cctx->prefix, cctx->prefixlen))
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return -2;
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cmd += cctx->prefixlen;
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}
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else if (cctx->flags & SSL_CONF_FLAG_CMDLINE)
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{
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if (*cmd != '-' || !cmd[1])
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return -2;
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cmd++;
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}
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/* Look for matching parameter name in table */
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for (i = 0, t = ssl_conf_cmds;
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i < sizeof(ssl_conf_cmds)/sizeof(ssl_conf_cmd_tbl); i++, t++)
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{
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if (cctx->flags & SSL_CONF_FLAG_CMDLINE)
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{
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if (t->str_cmdline && !strcmp(t->str_cmdline, cmd))
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{
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runcmd = t;
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break;
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}
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}
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if (cctx->flags & SSL_CONF_FLAG_FILE)
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{
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if (t->str_file && !strcasecmp(t->str_file, cmd))
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{
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runcmd = t;
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break;
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}
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}
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}
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if (runcmd)
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{
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int rv;
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if (value == NULL)
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return -3;
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rv = t->cmd(cctx, value);
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if (rv > 0)
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return 2;
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if (rv == -2)
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return -2;
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if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS)
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{
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SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_BAD_VALUE);
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ERR_add_error_data(4, "cmd=", cmd, ", value=", value);
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}
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return 0;
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}
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if (cctx->flags & SSL_CONF_FLAG_CMDLINE)
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{
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if (ctrl_str_option(cctx, cmd))
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return 1;
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}
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if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS)
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{
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SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_UNKNOWN_CMD_NAME);
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ERR_add_error_data(2, "cmd=", cmd);
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}
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return -2;
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}
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int SSL_CONF_cmd_argv(SSL_CONF_CTX *cctx, int *pargc, char ***pargv)
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{
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int rv;
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const char *arg = NULL, *argn;
|
|
if (pargc && *pargc == 0)
|
|
return 0;
|
|
if (!pargc || *pargc > 0)
|
|
arg = **pargv;
|
|
if (arg == NULL)
|
|
return 0;
|
|
if (!pargc || *pargc > 1)
|
|
argn = (*pargv)[1];
|
|
else
|
|
argn = NULL;
|
|
cctx->flags &= ~SSL_CONF_FLAG_FILE;
|
|
cctx->flags |= SSL_CONF_FLAG_CMDLINE;
|
|
rv = SSL_CONF_cmd(cctx, arg, argn);
|
|
if (rv > 0)
|
|
{
|
|
/* Success: update pargc, pargv */
|
|
(*pargv) += rv;
|
|
if (pargc)
|
|
(*pargc) -= rv;
|
|
return rv;
|
|
}
|
|
/* Unknown swicth: indicate no arguments processed */
|
|
if (rv == -2)
|
|
return 0;
|
|
/* Some error occurred processing command, return fatal error */
|
|
if (rv == 0)
|
|
return -1;
|
|
return rv;
|
|
}
|
|
|
|
SSL_CONF_CTX *SSL_CONF_CTX_new(void)
|
|
{
|
|
SSL_CONF_CTX *ret;
|
|
ret = OPENSSL_malloc(sizeof(SSL_CONF_CTX));
|
|
if (ret)
|
|
{
|
|
ret->flags = 0;
|
|
ret->prefix = NULL;
|
|
ret->prefixlen = 0;
|
|
ret->ssl = NULL;
|
|
ret->ctx = NULL;
|
|
ret->poptions = NULL;
|
|
ret->pcert_flags = NULL;
|
|
ret->tbl = NULL;
|
|
ret->ntbl = 0;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
void SSL_CONF_CTX_free(SSL_CONF_CTX *cctx)
|
|
{
|
|
if (cctx)
|
|
{
|
|
if (cctx->prefix)
|
|
OPENSSL_free(cctx->prefix);
|
|
OPENSSL_free(cctx);
|
|
}
|
|
}
|
|
|
|
unsigned int SSL_CONF_CTX_set_flags(SSL_CONF_CTX *cctx, unsigned int flags)
|
|
{
|
|
cctx->flags |= flags;
|
|
return cctx->flags;
|
|
}
|
|
|
|
unsigned int SSL_CONF_CTX_clear_flags(SSL_CONF_CTX *cctx, unsigned int flags)
|
|
{
|
|
cctx->flags &= ~flags;
|
|
return cctx->flags;
|
|
}
|
|
|
|
int SSL_CONF_CTX_set1_prefix(SSL_CONF_CTX *cctx, const char *pre)
|
|
{
|
|
char *tmp = NULL;
|
|
if (pre)
|
|
{
|
|
tmp = BUF_strdup(pre);
|
|
if (tmp == NULL)
|
|
return 0;
|
|
}
|
|
if (cctx->prefix)
|
|
OPENSSL_free(cctx->prefix);
|
|
cctx->prefix = tmp;
|
|
if (tmp)
|
|
cctx->prefixlen = strlen(tmp);
|
|
else
|
|
cctx->prefixlen = 0;
|
|
return 1;
|
|
}
|
|
|
|
void SSL_CONF_CTX_set_ssl(SSL_CONF_CTX *cctx, SSL *ssl)
|
|
{
|
|
cctx->ssl = ssl;
|
|
cctx->ctx = NULL;
|
|
if (ssl)
|
|
{
|
|
cctx->poptions = &ssl->options;
|
|
cctx->pcert_flags = &ssl->cert->cert_flags;
|
|
}
|
|
else
|
|
{
|
|
cctx->poptions = NULL;
|
|
cctx->pcert_flags = NULL;
|
|
}
|
|
}
|
|
|
|
void SSL_CONF_CTX_set_ssl_ctx(SSL_CONF_CTX *cctx, SSL_CTX *ctx)
|
|
{
|
|
cctx->ctx = ctx;
|
|
cctx->ssl = NULL;
|
|
if (ctx)
|
|
{
|
|
cctx->poptions = &ctx->options;
|
|
cctx->pcert_flags = &ctx->cert->cert_flags;
|
|
}
|
|
else
|
|
{
|
|
cctx->poptions = NULL;
|
|
cctx->pcert_flags = NULL;
|
|
}
|
|
}
|