2 * ! \file ssl/ssl_conf.c \brief SSL configuration functions
4 /* ====================================================================
5 * Copyright (c) 2012 The OpenSSL Project. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
19 * 3. All advertising materials mentioning features or use of this
20 * software must display the following acknowledgment:
21 * "This product includes software developed by the OpenSSL Project
22 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
24 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
25 * endorse or promote products derived from this software without
26 * prior written permission. For written permission, please contact
27 * openssl-core@openssl.org.
29 * 5. Products derived from this software may not be called "OpenSSL"
30 * nor may "OpenSSL" appear in their names without prior written
31 * permission of the OpenSSL Project.
33 * 6. Redistributions of any form whatsoever must retain the following
35 * "This product includes software developed by the OpenSSL Project
36 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
38 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
39 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
40 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
41 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
42 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
43 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
44 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
45 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
46 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
47 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
48 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
49 * OF THE POSSIBILITY OF SUCH DAMAGE.
50 * ====================================================================
52 * This product includes cryptographic software written by Eric Young
53 * (eay@cryptsoft.com). This product includes software written by Tim
54 * Hudson (tjh@cryptsoft.com).
63 #include <openssl/conf.h>
64 #include <openssl/objects.h>
66 # include <openssl/dh.h>
70 * structure holding name tables. This is used for pemitted elements in lists
71 * such as TLSv1 and single command line switches such as no_tls1
77 unsigned int name_flags;
78 unsigned long option_value;
81 /* Sense of name is inverted e.g. "TLSv1" will clear SSL_OP_NO_TLSv1 */
82 #define SSL_TFLAG_INV 0x1
83 /* Flags refers to cert_flags not options */
84 #define SSL_TFLAG_CERT 0x2
85 /* Option can only be used for clients */
86 #define SSL_TFLAG_CLIENT SSL_CONF_FLAG_CLIENT
87 /* Option can only be used for servers */
88 #define SSL_TFLAG_SERVER SSL_CONF_FLAG_SERVER
89 #define SSL_TFLAG_BOTH (SSL_TFLAG_CLIENT|SSL_TFLAG_SERVER)
91 #define SSL_FLAG_TBL(str, flag) \
92 {str, (int)(sizeof(str) - 1), SSL_TFLAG_BOTH, flag}
93 #define SSL_FLAG_TBL_SRV(str, flag) \
94 {str, (int)(sizeof(str) - 1), SSL_TFLAG_SERVER, flag}
95 #define SSL_FLAG_TBL_CLI(str, flag) \
96 {str, (int)(sizeof(str) - 1), SSL_TFLAG_CLIENT, flag}
97 #define SSL_FLAG_TBL_INV(str, flag) \
98 {str, (int)(sizeof(str) - 1), SSL_TFLAG_INV|SSL_TFLAG_BOTH, flag}
99 #define SSL_FLAG_TBL_SRV_INV(str, flag) \
100 {str, (int)(sizeof(str) - 1), SSL_TFLAG_INV|SSL_TFLAG_SERVER, flag}
101 #define SSL_FLAG_TBL_CERT(str, flag) \
102 {str, (int)(sizeof(str) - 1), SSL_TFLAG_CERT|SSL_TFLAG_BOTH, flag}
105 * Opaque structure containing SSL configuration context.
108 struct ssl_conf_ctx_st {
110 * Various flags indicating (among other things) which options we will
114 /* Prefix and length of commands */
117 /* SSL_CTX or SSL structure to perform operations on */
120 /* Pointer to SSL or SSL_CTX options field or NULL if none */
121 unsigned long *poptions;
122 /* Pointer to SSL or SSL_CTX cert_flags or NULL if none */
123 unsigned int *pcert_flags;
124 /* Current flag table being worked on */
125 const ssl_flag_tbl *tbl;
130 static int ssl_match_option(SSL_CONF_CTX *cctx, const ssl_flag_tbl *tbl,
131 const char *name, int namelen, int onoff)
133 /* If name not relevant for context skip */
134 if (!(cctx->flags & tbl->name_flags & SSL_TFLAG_BOTH))
137 if (strcmp(tbl->name, name))
139 } else if (tbl->namelen != namelen
140 || strncasecmp(tbl->name, name, namelen))
142 if (cctx->poptions) {
143 if (tbl->name_flags & SSL_TFLAG_INV)
145 if (tbl->name_flags & SSL_TFLAG_CERT) {
147 *cctx->pcert_flags |= tbl->option_value;
149 *cctx->pcert_flags &= ~tbl->option_value;
152 *cctx->poptions |= tbl->option_value;
154 *cctx->poptions &= ~tbl->option_value;
160 static int ssl_set_option_list(const char *elem, int len, void *usr)
162 SSL_CONF_CTX *cctx = usr;
164 const ssl_flag_tbl *tbl;
167 * len == -1 indicates not being called in list context, just for single
168 * command line switches, so don't allow +, -.
177 } else if (*elem == '-') {
183 for (i = 0, tbl = cctx->tbl; i < cctx->ntbl; i++, tbl++) {
184 if (ssl_match_option(cctx, tbl, elem, len, onoff))
190 /* Single command line switches with no argument e.g. -no_ssl3 */
191 static int ctrl_str_option(SSL_CONF_CTX *cctx, const char *cmd)
193 static const ssl_flag_tbl ssl_option_single[] = {
194 SSL_FLAG_TBL("no_ssl2", SSL_OP_NO_SSLv2),
195 SSL_FLAG_TBL("no_ssl3", SSL_OP_NO_SSLv3),
196 SSL_FLAG_TBL("no_tls1", SSL_OP_NO_TLSv1),
197 SSL_FLAG_TBL("no_tls1_1", SSL_OP_NO_TLSv1_1),
198 SSL_FLAG_TBL("no_tls1_2", SSL_OP_NO_TLSv1_2),
199 SSL_FLAG_TBL("bugs", SSL_OP_ALL),
200 SSL_FLAG_TBL("no_comp", SSL_OP_NO_COMPRESSION),
201 SSL_FLAG_TBL_SRV("ecdh_single", SSL_OP_SINGLE_ECDH_USE),
202 #ifndef OPENSSL_NO_TLSEXT
203 SSL_FLAG_TBL("no_ticket", SSL_OP_NO_TICKET),
205 SSL_FLAG_TBL_SRV("serverpref", SSL_OP_CIPHER_SERVER_PREFERENCE),
206 SSL_FLAG_TBL("legacy_renegotiation",
207 SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION),
208 SSL_FLAG_TBL_SRV("legacy_server_connect",
209 SSL_OP_LEGACY_SERVER_CONNECT),
210 SSL_FLAG_TBL_SRV("no_resumption_on_reneg",
211 SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION),
212 SSL_FLAG_TBL_SRV_INV("no_legacy_server_connect",
213 SSL_OP_LEGACY_SERVER_CONNECT),
214 SSL_FLAG_TBL_CERT("strict", SSL_CERT_FLAG_TLS_STRICT),
215 #ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
216 SSL_FLAG_TBL_CERT("debug_broken_protocol",
217 SSL_CERT_FLAG_BROKEN_PROTOCOL),
220 cctx->tbl = ssl_option_single;
221 cctx->ntbl = sizeof(ssl_option_single) / sizeof(ssl_flag_tbl);
222 return ssl_set_option_list(cmd, -1, cctx);
225 /* Set supported signature algorithms */
226 static int cmd_SignatureAlgorithms(SSL_CONF_CTX *cctx, const char *value)
230 rv = SSL_set1_sigalgs_list(cctx->ssl, value);
231 /* NB: ctx == NULL performs syntax checking only */
233 rv = SSL_CTX_set1_sigalgs_list(cctx->ctx, value);
237 /* Set supported client signature algorithms */
238 static int cmd_ClientSignatureAlgorithms(SSL_CONF_CTX *cctx,
243 rv = SSL_set1_client_sigalgs_list(cctx->ssl, value);
244 /* NB: ctx == NULL performs syntax checking only */
246 rv = SSL_CTX_set1_client_sigalgs_list(cctx->ctx, value);
250 static int cmd_Curves(SSL_CONF_CTX *cctx, const char *value)
254 rv = SSL_set1_curves_list(cctx->ssl, value);
255 /* NB: ctx == NULL performs syntax checking only */
257 rv = SSL_CTX_set1_curves_list(cctx->ctx, value);
261 #ifndef OPENSSL_NO_ECDH
262 /* ECDH temporary parameters */
263 static int cmd_ECDHParameters(SSL_CONF_CTX *cctx, const char *value)
265 int onoff = -1, rv = 1;
266 if (!(cctx->flags & SSL_CONF_FLAG_SERVER))
268 if (cctx->flags & SSL_CONF_FLAG_FILE) {
277 if (!strcasecmp(value, "automatic")) {
280 } else if (onoff != -1)
282 } else if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
283 if (!strcmp(value, "auto"))
289 rv = SSL_CTX_set_ecdh_auto(cctx->ctx, onoff);
291 rv = SSL_set_ecdh_auto(cctx->ssl, onoff);
295 nid = EC_curve_nist2nid(value);
296 if (nid == NID_undef)
297 nid = OBJ_sn2nid(value);
300 ecdh = EC_KEY_new_by_curve_name(nid);
304 rv = SSL_CTX_set_tmp_ecdh(cctx->ctx, ecdh);
306 rv = SSL_set_tmp_ecdh(cctx->ssl, ecdh);
313 static int cmd_CipherString(SSL_CONF_CTX *cctx, const char *value)
317 rv = SSL_CTX_set_cipher_list(cctx->ctx, value);
319 rv = SSL_set_cipher_list(cctx->ssl, value);
323 static int cmd_Protocol(SSL_CONF_CTX *cctx, const char *value)
325 static const ssl_flag_tbl ssl_protocol_list[] = {
326 SSL_FLAG_TBL_INV("ALL", SSL_OP_NO_SSL_MASK),
327 SSL_FLAG_TBL_INV("SSLv2", SSL_OP_NO_SSLv2),
328 SSL_FLAG_TBL_INV("SSLv3", SSL_OP_NO_SSLv3),
329 SSL_FLAG_TBL_INV("TLSv1", SSL_OP_NO_TLSv1),
330 SSL_FLAG_TBL_INV("TLSv1.1", SSL_OP_NO_TLSv1_1),
331 SSL_FLAG_TBL_INV("TLSv1.2", SSL_OP_NO_TLSv1_2)
333 if (!(cctx->flags & SSL_CONF_FLAG_FILE))
335 cctx->tbl = ssl_protocol_list;
336 cctx->ntbl = sizeof(ssl_protocol_list) / sizeof(ssl_flag_tbl);
337 return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
340 static int cmd_Options(SSL_CONF_CTX *cctx, const char *value)
342 static const ssl_flag_tbl ssl_option_list[] = {
343 SSL_FLAG_TBL_INV("SessionTicket", SSL_OP_NO_TICKET),
344 SSL_FLAG_TBL_INV("EmptyFragments",
345 SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS),
346 SSL_FLAG_TBL("Bugs", SSL_OP_ALL),
347 SSL_FLAG_TBL_INV("Compression", SSL_OP_NO_COMPRESSION),
348 SSL_FLAG_TBL_SRV("ServerPreference", SSL_OP_CIPHER_SERVER_PREFERENCE),
349 SSL_FLAG_TBL_SRV("NoResumptionOnRenegotiation",
350 SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION),
351 SSL_FLAG_TBL_SRV("DHSingle", SSL_OP_SINGLE_DH_USE),
352 SSL_FLAG_TBL_SRV("ECDHSingle", SSL_OP_SINGLE_ECDH_USE),
353 SSL_FLAG_TBL("UnsafeLegacyRenegotiation",
354 SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION),
356 if (!(cctx->flags & SSL_CONF_FLAG_FILE))
360 cctx->tbl = ssl_option_list;
361 cctx->ntbl = sizeof(ssl_option_list) / sizeof(ssl_flag_tbl);
362 return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
365 static int cmd_Certificate(SSL_CONF_CTX *cctx, const char *value)
368 if (!(cctx->flags & SSL_CONF_FLAG_CERTIFICATE))
371 rv = SSL_CTX_use_certificate_chain_file(cctx->ctx, value);
373 rv = SSL_use_certificate_file(cctx->ssl, value, SSL_FILETYPE_PEM);
377 static int cmd_PrivateKey(SSL_CONF_CTX *cctx, const char *value)
380 if (!(cctx->flags & SSL_CONF_FLAG_CERTIFICATE))
383 rv = SSL_CTX_use_PrivateKey_file(cctx->ctx, value, SSL_FILETYPE_PEM);
385 rv = SSL_use_PrivateKey_file(cctx->ssl, value, SSL_FILETYPE_PEM);
389 #ifndef OPENSSL_NO_DH
390 static int cmd_DHParameters(SSL_CONF_CTX *cctx, const char *value)
395 if (!(cctx->flags & SSL_CONF_FLAG_CERTIFICATE))
397 if (cctx->ctx || cctx->ssl) {
398 in = BIO_new(BIO_s_file_internal());
401 if (BIO_read_filename(in, value) <= 0)
403 dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL);
409 rv = SSL_CTX_set_tmp_dh(cctx->ctx, dh);
411 rv = SSL_set_tmp_dh(cctx->ssl, dh);
421 int (*cmd) (SSL_CONF_CTX *cctx, const char *value);
422 const char *str_file;
423 const char *str_cmdline;
424 unsigned int value_type;
427 /* Table of supported parameters */
429 #define SSL_CONF_CMD(name, cmdopt, type) \
430 {cmd_##name, #name, cmdopt, type}
432 #define SSL_CONF_CMD_STRING(name, cmdopt) \
433 SSL_CONF_CMD(name, cmdopt, SSL_CONF_TYPE_STRING)
435 static const ssl_conf_cmd_tbl ssl_conf_cmds[] = {
436 SSL_CONF_CMD_STRING(SignatureAlgorithms, "sigalgs"),
437 SSL_CONF_CMD_STRING(ClientSignatureAlgorithms, "client_sigalgs"),
438 SSL_CONF_CMD_STRING(Curves, "curves"),
439 #ifndef OPENSSL_NO_ECDH
440 SSL_CONF_CMD_STRING(ECDHParameters, "named_curve"),
442 SSL_CONF_CMD_STRING(CipherString, "cipher"),
443 SSL_CONF_CMD_STRING(Protocol, NULL),
444 SSL_CONF_CMD_STRING(Options, NULL),
445 SSL_CONF_CMD(Certificate, "cert", SSL_CONF_TYPE_FILE),
446 SSL_CONF_CMD(PrivateKey, "key", SSL_CONF_TYPE_FILE),
447 #ifndef OPENSSL_NO_DH
448 SSL_CONF_CMD(DHParameters, "dhparam", SSL_CONF_TYPE_FILE)
452 static int ssl_conf_cmd_skip_prefix(SSL_CONF_CTX *cctx, const char **pcmd)
456 /* If a prefix is set, check and skip */
458 if (strlen(*pcmd) <= cctx->prefixlen)
460 if (cctx->flags & SSL_CONF_FLAG_CMDLINE &&
461 strncmp(*pcmd, cctx->prefix, cctx->prefixlen))
463 if (cctx->flags & SSL_CONF_FLAG_FILE &&
464 strncasecmp(*pcmd, cctx->prefix, cctx->prefixlen))
466 *pcmd += cctx->prefixlen;
467 } else if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
468 if (**pcmd != '-' || !(*pcmd)[1])
475 static const ssl_conf_cmd_tbl *ssl_conf_cmd_lookup(SSL_CONF_CTX *cctx,
478 const ssl_conf_cmd_tbl *t;
483 /* Look for matching parameter name in table */
484 for (i = 0, t = ssl_conf_cmds;
485 i < sizeof(ssl_conf_cmds) / sizeof(ssl_conf_cmd_tbl); i++, t++) {
486 if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
487 if (t->str_cmdline && !strcmp(t->str_cmdline, cmd))
490 if (cctx->flags & SSL_CONF_FLAG_FILE) {
491 if (t->str_file && !strcasecmp(t->str_file, cmd))
498 int SSL_CONF_cmd(SSL_CONF_CTX *cctx, const char *cmd, const char *value)
500 const ssl_conf_cmd_tbl *runcmd;
502 SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_INVALID_NULL_CMD_NAME);
506 if (!ssl_conf_cmd_skip_prefix(cctx, &cmd))
509 runcmd = ssl_conf_cmd_lookup(cctx, cmd);
515 rv = runcmd->cmd(cctx, value);
520 if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS) {
521 SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_BAD_VALUE);
522 ERR_add_error_data(4, "cmd=", cmd, ", value=", value);
527 if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
528 if (ctrl_str_option(cctx, cmd))
532 if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS) {
533 SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_UNKNOWN_CMD_NAME);
534 ERR_add_error_data(2, "cmd=", cmd);
540 int SSL_CONF_cmd_argv(SSL_CONF_CTX *cctx, int *pargc, char ***pargv)
543 const char *arg = NULL, *argn;
544 if (pargc && *pargc == 0)
546 if (!pargc || *pargc > 0)
550 if (!pargc || *pargc > 1)
554 cctx->flags &= ~SSL_CONF_FLAG_FILE;
555 cctx->flags |= SSL_CONF_FLAG_CMDLINE;
556 rv = SSL_CONF_cmd(cctx, arg, argn);
558 /* Success: update pargc, pargv */
564 /* Unknown switch: indicate no arguments processed */
567 /* Some error occurred processing command, return fatal error */
573 int SSL_CONF_cmd_value_type(SSL_CONF_CTX *cctx, const char *cmd)
575 if (ssl_conf_cmd_skip_prefix(cctx, &cmd)) {
576 const ssl_conf_cmd_tbl *runcmd;
577 runcmd = ssl_conf_cmd_lookup(cctx, cmd);
579 return runcmd->value_type;
581 return SSL_CONF_TYPE_UNKNOWN;
584 SSL_CONF_CTX *SSL_CONF_CTX_new(void)
587 ret = OPENSSL_malloc(sizeof(SSL_CONF_CTX));
594 ret->poptions = NULL;
595 ret->pcert_flags = NULL;
602 int SSL_CONF_CTX_finish(SSL_CONF_CTX *cctx)
607 void SSL_CONF_CTX_free(SSL_CONF_CTX *cctx)
611 OPENSSL_free(cctx->prefix);
616 unsigned int SSL_CONF_CTX_set_flags(SSL_CONF_CTX *cctx, unsigned int flags)
618 cctx->flags |= flags;
622 unsigned int SSL_CONF_CTX_clear_flags(SSL_CONF_CTX *cctx, unsigned int flags)
624 cctx->flags &= ~flags;
628 int SSL_CONF_CTX_set1_prefix(SSL_CONF_CTX *cctx, const char *pre)
632 tmp = BUF_strdup(pre);
637 OPENSSL_free(cctx->prefix);
640 cctx->prefixlen = strlen(tmp);
646 void SSL_CONF_CTX_set_ssl(SSL_CONF_CTX *cctx, SSL *ssl)
651 cctx->poptions = &ssl->options;
652 cctx->pcert_flags = &ssl->cert->cert_flags;
654 cctx->poptions = NULL;
655 cctx->pcert_flags = NULL;
659 void SSL_CONF_CTX_set_ssl_ctx(SSL_CONF_CTX *cctx, SSL_CTX *ctx)
664 cctx->poptions = &ctx->options;
665 cctx->pcert_flags = &ctx->cert->cert_flags;
667 cctx->poptions = NULL;
668 cctx->pcert_flags = NULL;