ssl/ssl_conf.c

   1 /*
   2  * ! \file ssl/ssl_conf.c \brief SSL configuration functions
   3  */
   4 /* ====================================================================
   5  * Copyright (c) 2012 The OpenSSL Project.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  *
  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
  17  *    distribution.
  18  *
  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/)"
  23  *
  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.
  28  *
  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.
  32  *
  33  * 6. Redistributions of any form whatsoever must retain the following
  34  *    acknowledgment:
  35  *    "This product includes software developed by the OpenSSL Project
  36  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  37  *
  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  * ====================================================================
  51  *
  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).
  55  *
  56  */
  57
  58 #ifdef REF_CHECK
  59 # include <assert.h>
  60 #endif
  61 #include <stdio.h>
  62 #include "ssl_locl.h"
  63 #include <openssl/conf.h>
  64 #include <openssl/objects.h>
  65 #ifndef OPENSSL_NO_DH
  66 # include <openssl/dh.h>
  67 #endif
  68
  69 /*
  70  * structure holding name tables. This is used for pemitted elements in lists
  71  * such as TLSv1.
  72  */
  73
  74 typedef struct {
  75     const char *name;
  76     int namelen;
  77     unsigned int name_flags;
  78     unsigned long option_value;
  79 } ssl_flag_tbl;
  80
  81 /* Switch table: use for single command line switches like no_tls2 */
  82 typedef struct {
  83     unsigned long option_value;
  84     unsigned int name_flags;
  85 } ssl_switch_tbl;
  86
  87 /* Sense of name is inverted e.g. "TLSv1" will clear SSL_OP_NO_TLSv1 */
  88 #define SSL_TFLAG_INV   0x1
  89 /* Mask for type of flag referred to */
  90 #define SSL_TFLAG_TYPE_MASK 0xf00
  91 /* Flag is for options */
  92 #define SSL_TFLAG_OPTION    0x000
  93 /* Flag is for cert_flags */
  94 #define SSL_TFLAG_CERT      0x100
  95 /* Flag is for verify mode */
  96 #define SSL_TFLAG_VFY       0x200
  97 /* Option can only be used for clients */
  98 #define SSL_TFLAG_CLIENT SSL_CONF_FLAG_CLIENT
  99 /* Option can only be used for servers */
 100 #define SSL_TFLAG_SERVER SSL_CONF_FLAG_SERVER
 101 #define SSL_TFLAG_BOTH (SSL_TFLAG_CLIENT|SSL_TFLAG_SERVER)
 102
 103 #define SSL_FLAG_TBL(str, flag) \
 104         {str, (int)(sizeof(str) - 1), SSL_TFLAG_BOTH, flag}
 105 #define SSL_FLAG_TBL_SRV(str, flag) \
 106         {str, (int)(sizeof(str) - 1), SSL_TFLAG_SERVER, flag}
 107 #define SSL_FLAG_TBL_CLI(str, flag) \
 108         {str, (int)(sizeof(str) - 1), SSL_TFLAG_CLIENT, flag}
 109 #define SSL_FLAG_TBL_INV(str, flag) \
 110         {str, (int)(sizeof(str) - 1), SSL_TFLAG_INV|SSL_TFLAG_BOTH, flag}
 111 #define SSL_FLAG_TBL_SRV_INV(str, flag) \
 112         {str, (int)(sizeof(str) - 1), SSL_TFLAG_INV|SSL_TFLAG_SERVER, flag}
 113 #define SSL_FLAG_TBL_CERT(str, flag) \
 114         {str, (int)(sizeof(str) - 1), SSL_TFLAG_CERT|SSL_TFLAG_BOTH, flag}
 115
 116 #define SSL_FLAG_VFY_CLI(str, flag) \
 117         {str, (int)(sizeof(str) - 1), SSL_TFLAG_VFY | SSL_TFLAG_CLIENT, flag}
 118 #define SSL_FLAG_VFY_SRV(str, flag) \
 119         {str, (int)(sizeof(str) - 1), SSL_TFLAG_VFY | SSL_TFLAG_SERVER, flag}
 120
 121 /*
 122  * Opaque structure containing SSL configuration context.
 123  */
 124
 125 struct ssl_conf_ctx_st {
 126     /*
 127      * Various flags indicating (among other things) which options we will
 128      * recognise.
 129      */
 130     unsigned int flags;
 131     /* Prefix and length of commands */
 132     char *prefix;
 133     size_t prefixlen;
 134     /* SSL_CTX or SSL structure to perform operations on */
 135     SSL_CTX *ctx;
 136     SSL *ssl;
 137     /* Pointer to SSL or SSL_CTX options field or NULL if none */
 138     uint32_t *poptions;
 139     /* Certificate filenames for each type */
 140     char *cert_filename[SSL_PKEY_NUM];
 141     /* Pointer to SSL or SSL_CTX cert_flags or NULL if none */
 142     uint32_t *pcert_flags;
 143     /* Pointer to SSL or SSL_CTX verify_mode or NULL if none */
 144     uint32_t *pvfy_flags;
 145     /* Current flag table being worked on */
 146     const ssl_flag_tbl *tbl;
 147     /* Size of table */
 148     size_t ntbl;
 149     /* Client CA names */
 150     STACK_OF(X509_NAME) *canames;
 151 };
 152
 153 static void ssl_set_option(SSL_CONF_CTX *cctx, unsigned int name_flags,
 154                            unsigned long option_value, int onoff)
 155 {
 156     unint32_t *pflags;
 157     if (cctx->poptions == NULL)
 158         return;
 159     if (name_flags & SSL_TFLAG_INV)
 160         onoff ^= 1;
 161     switch (name_flags & SSL_TFLAG_TYPE_MASK) {
 162
 163     case SSL_TFLAG_CERT:
 164         pflags = cctx->pcert_flags;
 165         break;
 166
 167     case SSL_TFLAG_VFY:
 168         pflags =  cctx->pvfy_flags;
 169         break;
 170
 171     case SSL_TFLAG_OPTION:
 172         pflags = cctx->poptions;
 173         break;
 174
 175     default:
 176         return;
 177
 178     }
 179     if (onoff)
 180         *pflags |= option_value;
 181     else
 182         *pflags &= ~option_value;
 183 }
 184
 185 static int ssl_match_option(SSL_CONF_CTX *cctx, const ssl_flag_tbl *tbl,
 186                             const char *name, int namelen, int onoff)
 187 {
 188     /* If name not relevant for context skip */
 189     if (!(cctx->flags & tbl->name_flags & SSL_TFLAG_BOTH))
 190         return 0;
 191     if (namelen == -1) {
 192         if (strcmp(tbl->name, name))
 193             return 0;
 194     } else if (tbl->namelen != namelen
 195                || strncasecmp(tbl->name, name, namelen))
 196         return 0;
 197     ssl_set_option(cctx, tbl->name_flags, tbl->option_value, onoff);
 198     return 1;
 199 }
 200
 201 static int ssl_set_option_list(const char *elem, int len, void *usr)
 202 {
 203     SSL_CONF_CTX *cctx = usr;
 204     size_t i;
 205     const ssl_flag_tbl *tbl;
 206     int onoff = 1;
 207     /*
 208      * len == -1 indicates not being called in list context, just for single
 209      * command line switches, so don't allow +, -.
 210      */
 211     if (elem == NULL)
 212         return 0;
 213     if (len != -1) {
 214         if (*elem == '+') {
 215             elem++;
 216             len--;
 217             onoff = 1;
 218         } else if (*elem == '-') {
 219             elem++;
 220             len--;
 221             onoff = 0;
 222         }
 223     }
 224     for (i = 0, tbl = cctx->tbl; i < cctx->ntbl; i++, tbl++) {
 225         if (ssl_match_option(cctx, tbl, elem, len, onoff))
 226             return 1;
 227     }
 228     return 0;
 229 }
 230
 231 /* Set supported signature algorithms */
 232 static int cmd_SignatureAlgorithms(SSL_CONF_CTX *cctx, const char *value)
 233 {
 234     int rv;
 235     if (cctx->ssl)
 236         rv = SSL_set1_sigalgs_list(cctx->ssl, value);
 237     /* NB: ctx == NULL performs syntax checking only */
 238     else
 239         rv = SSL_CTX_set1_sigalgs_list(cctx->ctx, value);
 240     return rv > 0;
 241 }
 242
 243 /* Set supported client signature algorithms */
 244 static int cmd_ClientSignatureAlgorithms(SSL_CONF_CTX *cctx,
 245                                          const char *value)
 246 {
 247     int rv;
 248     if (cctx->ssl)
 249         rv = SSL_set1_client_sigalgs_list(cctx->ssl, value);
 250     /* NB: ctx == NULL performs syntax checking only */
 251     else
 252         rv = SSL_CTX_set1_client_sigalgs_list(cctx->ctx, value);
 253     return rv > 0;
 254 }
 255
 256 static int cmd_Curves(SSL_CONF_CTX *cctx, const char *value)
 257 {
 258     int rv;
 259     if (cctx->ssl)
 260         rv = SSL_set1_curves_list(cctx->ssl, value);
 261     /* NB: ctx == NULL performs syntax checking only */
 262     else
 263         rv = SSL_CTX_set1_curves_list(cctx->ctx, value);
 264     return rv > 0;
 265 }
 266
 267 #ifndef OPENSSL_NO_EC
 268 /* ECDH temporary parameters */
 269 static int cmd_ECDHParameters(SSL_CONF_CTX *cctx, const char *value)
 270 {
 271     int onoff = -1, rv = 1;
 272     if (cctx->flags & SSL_CONF_FLAG_FILE) {
 273         if (*value == '+') {
 274             onoff = 1;
 275             value++;
 276         }
 277         if (*value == '-') {
 278             onoff = 0;
 279             value++;
 280         }
 281         if (strcasecmp(value, "automatic") == 0) {
 282             if (onoff == -1)
 283                 onoff = 1;
 284         } else if (onoff != -1)
 285             return 0;
 286     } else if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
 287         if (strcmp(value, "auto") == 0)
 288             onoff = 1;
 289     }
 290
 291     if (onoff != -1) {
 292         if (cctx->ctx)
 293             rv = SSL_CTX_set_ecdh_auto(cctx->ctx, onoff);
 294         else if (cctx->ssl)
 295             rv = SSL_set_ecdh_auto(cctx->ssl, onoff);
 296     } else {
 297         EC_KEY *ecdh;
 298         int nid;
 299         nid = EC_curve_nist2nid(value);
 300         if (nid == NID_undef)
 301             nid = OBJ_sn2nid(value);
 302         if (nid == 0)
 303             return 0;
 304         ecdh = EC_KEY_new_by_curve_name(nid);
 305         if (!ecdh)
 306             return 0;
 307         if (cctx->ctx)
 308             rv = SSL_CTX_set_tmp_ecdh(cctx->ctx, ecdh);
 309         else if (cctx->ssl)
 310             rv = SSL_set_tmp_ecdh(cctx->ssl, ecdh);
 311         EC_KEY_free(ecdh);
 312     }
 313
 314     return rv > 0;
 315 }
 316 #endif
 317 static int cmd_CipherString(SSL_CONF_CTX *cctx, const char *value)
 318 {
 319     int rv = 1;
 320     if (cctx->ctx)
 321         rv = SSL_CTX_set_cipher_list(cctx->ctx, value);
 322     if (cctx->ssl)
 323         rv = SSL_set_cipher_list(cctx->ssl, value);
 324     return rv > 0;
 325 }
 326
 327 static int cmd_Protocol(SSL_CONF_CTX *cctx, const char *value)
 328 {
 329     static const ssl_flag_tbl ssl_protocol_list[] = {
 330         SSL_FLAG_TBL_INV("ALL", SSL_OP_NO_SSL_MASK),
 331         SSL_FLAG_TBL_INV("SSLv2", SSL_OP_NO_SSLv2),
 332         SSL_FLAG_TBL_INV("SSLv3", SSL_OP_NO_SSLv3),
 333         SSL_FLAG_TBL_INV("TLSv1", SSL_OP_NO_TLSv1),
 334         SSL_FLAG_TBL_INV("TLSv1.1", SSL_OP_NO_TLSv1_1),
 335         SSL_FLAG_TBL_INV("TLSv1.2", SSL_OP_NO_TLSv1_2)
 336     };
 337     cctx->tbl = ssl_protocol_list;
 338     cctx->ntbl = OSSL_NELEM(ssl_protocol_list);
 339     return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
 340 }
 341
 342 static int cmd_Options(SSL_CONF_CTX *cctx, const char *value)
 343 {
 344     static const ssl_flag_tbl ssl_option_list[] = {
 345         SSL_FLAG_TBL_INV("SessionTicket", SSL_OP_NO_TICKET),
 346         SSL_FLAG_TBL_INV("EmptyFragments",
 347                          SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS),
 348         SSL_FLAG_TBL("Bugs", SSL_OP_ALL),
 349         SSL_FLAG_TBL_INV("Compression", SSL_OP_NO_COMPRESSION),
 350         SSL_FLAG_TBL_SRV("ServerPreference", SSL_OP_CIPHER_SERVER_PREFERENCE),
 351         SSL_FLAG_TBL_SRV("NoResumptionOnRenegotiation",
 352                          SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION),
 353         SSL_FLAG_TBL_SRV("DHSingle", SSL_OP_SINGLE_DH_USE),
 354         SSL_FLAG_TBL_SRV("ECDHSingle", SSL_OP_SINGLE_ECDH_USE),
 355         SSL_FLAG_TBL("UnsafeLegacyRenegotiation",
 356                      SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION),
 357     };
 358     if (value == NULL)
 359         return -3;
 360     cctx->tbl = ssl_option_list;
 361     cctx->ntbl = OSSL_NELEM(ssl_option_list);
 362     return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
 363 }
 364
 365 static int cmd_VerifyMode(SSL_CONF_CTX *cctx, const char *value)
 366 {
 367     static const ssl_flag_tbl ssl_vfy_list[] = {
 368         SSL_FLAG_VFY_CLI("Peer", SSL_VERIFY_PEER),
 369         SSL_FLAG_VFY_SRV("Request", SSL_VERIFY_PEER),
 370         SSL_FLAG_VFY_SRV("Require",
 371                          SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT),
 372         SSL_FLAG_VFY_SRV("Once", SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE)
 373     };
 374     if (value == NULL)
 375         return -3;
 376     cctx->tbl = ssl_vfy_list;
 377     cctx->ntbl = OSSL_NELEM(ssl_vfy_list);
 378     return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
 379 }
 380
 381 static int cmd_Certificate(SSL_CONF_CTX *cctx, const char *value)
 382 {
 383     int rv = 1;
 384     CERT *c = NULL;
 385     if (cctx->ctx) {
 386         rv = SSL_CTX_use_certificate_chain_file(cctx->ctx, value);
 387         c = cctx->ctx->cert;
 388     }
 389     if (cctx->ssl) {
 390         rv = SSL_use_certificate_chain_file(cctx->ssl, value);
 391         c = cctx->ssl->cert;
 392     }
 393     if (rv > 0 && c && cctx->flags & SSL_CONF_FLAG_REQUIRE_PRIVATE) {
 394         char **pfilename = &cctx->cert_filename[c->key - c->pkeys];
 395         OPENSSL_free(*pfilename);
 396         *pfilename = BUF_strdup(value);
 397         if (!*pfilename)
 398             rv = 0;
 399     }
 400
 401     return rv > 0;
 402 }
 403
 404 static int cmd_PrivateKey(SSL_CONF_CTX *cctx, const char *value)
 405 {
 406     int rv = 1;
 407     if (!(cctx->flags & SSL_CONF_FLAG_CERTIFICATE))
 408         return -2;
 409     if (cctx->ctx)
 410         rv = SSL_CTX_use_PrivateKey_file(cctx->ctx, value, SSL_FILETYPE_PEM);
 411     if (cctx->ssl)
 412         rv = SSL_use_PrivateKey_file(cctx->ssl, value, SSL_FILETYPE_PEM);
 413     return rv > 0;
 414 }
 415
 416 static int cmd_ServerInfoFile(SSL_CONF_CTX *cctx, const char *value)
 417 {
 418     int rv = 1;
 419     if (cctx->ctx)
 420         rv = SSL_CTX_use_serverinfo_file(cctx->ctx, value);
 421     return rv > 0;
 422 }
 423
 424 static int do_store(SSL_CONF_CTX *cctx,
 425                     const char *CAfile, const char *CApath, int verify_store)
 426 {
 427     CERT *cert;
 428     X509_STORE **st;
 429     if (cctx->ctx)
 430         cert = cctx->ctx->cert;
 431     else if (cctx->ssl)
 432         cert = cctx->ssl->cert;
 433     else
 434         return 1;
 435     st = verify_store ? &cert->verify_store : &cert->chain_store;
 436     if (*st == NULL) {
 437         *st = X509_STORE_new();
 438         if (*st == NULL)
 439             return 0;
 440     }
 441     return X509_STORE_load_locations(*st, CAfile, CApath) > 0;
 442 }
 443
 444 static int cmd_ChainCAPath(SSL_CONF_CTX *cctx, const char *value)
 445 {
 446     return do_store(cctx, NULL, value, 0);
 447 }
 448
 449 static int cmd_ChainCAFile(SSL_CONF_CTX *cctx, const char *value)
 450 {
 451     return do_store(cctx, value, NULL, 0);
 452 }
 453
 454 static int cmd_VerifyCAPath(SSL_CONF_CTX *cctx, const char *value)
 455 {
 456     return do_store(cctx, NULL, value, 1);
 457 }
 458
 459 static int cmd_VerifyCAFile(SSL_CONF_CTX *cctx, const char *value)
 460 {
 461     return do_store(cctx, value, NULL, 1);
 462 }
 463
 464 static int cmd_ClientCAFile(SSL_CONF_CTX *cctx, const char *value)
 465 {
 466     if (cctx->canames == NULL)
 467         cctx->canames = sk_X509_NAME_new_null();
 468     if (cctx->canames == NULL)
 469         return 0;
 470     return SSL_add_file_cert_subjects_to_stack(cctx->canames, value);
 471 }
 472
 473 static int cmd_ClientCAPath(SSL_CONF_CTX *cctx, const char *value)
 474 {
 475     if (cctx->canames == NULL)
 476         cctx->canames = sk_X509_NAME_new_null();
 477     if (cctx->canames == NULL)
 478         return 0;
 479     return SSL_add_dir_cert_subjects_to_stack(cctx->canames, value);
 480 }
 481
 482 #ifndef OPENSSL_NO_DH
 483 static int cmd_DHParameters(SSL_CONF_CTX *cctx, const char *value)
 484 {
 485     int rv = 0;
 486     DH *dh = NULL;
 487     BIO *in = NULL;
 488     if (cctx->ctx || cctx->ssl) {
 489         in = BIO_new(BIO_s_file_internal());
 490         if (!in)
 491             goto end;
 492         if (BIO_read_filename(in, value) <= 0)
 493             goto end;
 494         dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL);
 495         if (!dh)
 496             goto end;
 497     } else
 498         return 1;
 499     if (cctx->ctx)
 500         rv = SSL_CTX_set_tmp_dh(cctx->ctx, dh);
 501     if (cctx->ssl)
 502         rv = SSL_set_tmp_dh(cctx->ssl, dh);
 503  end:
 504     DH_free(dh);
 505     BIO_free(in);
 506     return rv > 0;
 507 }
 508 #endif
 509 typedef struct {
 510     int (*cmd) (SSL_CONF_CTX *cctx, const char *value);
 511     const char *str_file;
 512     const char *str_cmdline;
 513     unsigned short flags;
 514     unsigned short value_type;
 515 } ssl_conf_cmd_tbl;
 516
 517 /* Table of supported parameters */
 518
 519 #define SSL_CONF_CMD(name, cmdopt, flags, type) \
 520         {cmd_##name, #name, cmdopt, flags, type}
 521
 522 #define SSL_CONF_CMD_STRING(name, cmdopt, flags) \
 523         SSL_CONF_CMD(name, cmdopt, flags, SSL_CONF_TYPE_STRING)
 524
 525 #define SSL_CONF_CMD_SWITCH(name, flags) \
 526         {0, NULL, name, flags, SSL_CONF_TYPE_NONE}
 527
 528 /* See apps/apps.h if you change this table. */
 529 static const ssl_conf_cmd_tbl ssl_conf_cmds[] = {
 530     SSL_CONF_CMD_SWITCH("no_ssl3", 0),
 531     SSL_CONF_CMD_SWITCH("no_tls1", 0),
 532     SSL_CONF_CMD_SWITCH("no_tls1_1", 0),
 533     SSL_CONF_CMD_SWITCH("no_tls1_2", 0),
 534     SSL_CONF_CMD_SWITCH("bugs", 0),
 535     SSL_CONF_CMD_SWITCH("no_comp", 0),
 536     SSL_CONF_CMD_SWITCH("ecdh_single", SSL_CONF_FLAG_SERVER),
 537     SSL_CONF_CMD_SWITCH("no_ticket", 0),
 538     SSL_CONF_CMD_SWITCH("serverpref", SSL_CONF_FLAG_SERVER),
 539     SSL_CONF_CMD_SWITCH("legacy_renegotiation", 0),
 540     SSL_CONF_CMD_SWITCH("legacy_server_connect", SSL_CONF_FLAG_SERVER),
 541     SSL_CONF_CMD_SWITCH("no_resumption_on_reneg", SSL_CONF_FLAG_SERVER),
 542     SSL_CONF_CMD_SWITCH("no_legacy_server_connect", SSL_CONF_FLAG_SERVER),
 543     SSL_CONF_CMD_SWITCH("strict", 0),
 544 #ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
 545     SSL_CONF_CMD_SWITCH("debug_broken_protocol", 0),
 546 #endif
 547     SSL_CONF_CMD_STRING(SignatureAlgorithms, "sigalgs", 0),
 548     SSL_CONF_CMD_STRING(ClientSignatureAlgorithms, "client_sigalgs", 0),
 549     SSL_CONF_CMD_STRING(Curves, "curves", 0),
 550 #ifndef OPENSSL_NO_EC
 551     SSL_CONF_CMD_STRING(ECDHParameters, "named_curve", SSL_CONF_FLAG_SERVER),
 552 #endif
 553     SSL_CONF_CMD_STRING(CipherString, "cipher", 0),
 554     SSL_CONF_CMD_STRING(Protocol, NULL, 0),
 555     SSL_CONF_CMD_STRING(Options, NULL, 0),
 556     SSL_CONF_CMD_STRING(VerifyMode, NULL, 0),
 557     SSL_CONF_CMD(Certificate, "cert", SSL_CONF_FLAG_CERTIFICATE,
 558                  SSL_CONF_TYPE_FILE),
 559     SSL_CONF_CMD(PrivateKey, "key", SSL_CONF_FLAG_CERTIFICATE,
 560                  SSL_CONF_TYPE_FILE),
 561     SSL_CONF_CMD(ServerInfoFile, NULL,
 562                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 563                  SSL_CONF_TYPE_FILE),
 564     SSL_CONF_CMD(ChainCAPath, "chainCApath", SSL_CONF_FLAG_CERTIFICATE,
 565                  SSL_CONF_TYPE_DIR),
 566     SSL_CONF_CMD(ChainCAFile, "chainCAfile", SSL_CONF_FLAG_CERTIFICATE,
 567                  SSL_CONF_TYPE_FILE),
 568     SSL_CONF_CMD(VerifyCAPath, "verifyCApath", SSL_CONF_FLAG_CERTIFICATE,
 569                  SSL_CONF_TYPE_DIR),
 570     SSL_CONF_CMD(VerifyCAFile, "verifyCAfile", SSL_CONF_FLAG_CERTIFICATE,
 571                  SSL_CONF_TYPE_FILE),
 572     SSL_CONF_CMD(ClientCAFile, NULL,
 573                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 574                  SSL_CONF_TYPE_FILE),
 575     SSL_CONF_CMD(ClientCAPath, NULL,
 576                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 577                  SSL_CONF_TYPE_DIR),
 578 #ifndef OPENSSL_NO_DH
 579     SSL_CONF_CMD(DHParameters, "dhparam",
 580                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 581                  SSL_CONF_TYPE_FILE)
 582 #endif
 583 };
 584
 585 /* Supported switches: must match order of switches in ssl_conf_cmds */
 586 static const ssl_switch_tbl ssl_cmd_switches[] = {
 587     {SSL_OP_NO_SSLv3, 0},       /* no_ssl3 */
 588     {SSL_OP_NO_TLSv1, 0},       /* no_tls1 */
 589     {SSL_OP_NO_TLSv1_1, 0},     /* no_tls1_1 */
 590     {SSL_OP_NO_TLSv1_2, 0},     /* no_tls1_2 */
 591     {SSL_OP_ALL, 0},            /* bugs */
 592     {SSL_OP_NO_COMPRESSION, 0}, /* no_comp */
 593     {SSL_OP_SINGLE_ECDH_USE, 0}, /* ecdh_single */
 594     {SSL_OP_NO_TICKET, 0},      /* no_ticket */
 595     {SSL_OP_CIPHER_SERVER_PREFERENCE, 0}, /* serverpref */
 596     /* legacy_renegotiation */
 597     {SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION, 0},
 598     /* legacy_server_connect */
 599     {SSL_OP_LEGACY_SERVER_CONNECT, 0},
 600     /* no_resumption_on_reneg */
 601     {SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION, 0},
 602     /* no_legacy_server_connect */
 603     {SSL_OP_LEGACY_SERVER_CONNECT, SSL_TFLAG_INV},
 604     {SSL_CERT_FLAG_TLS_STRICT, SSL_TFLAG_CERT}, /* strict */
 605 #ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
 606     {SSL_CERT_FLAG_BROKEN_PROTOCOL, SSL_TFLAG_CERT} /* debug_broken_protocol */
 607 #endif
 608 };
 609
 610 static int ssl_conf_cmd_skip_prefix(SSL_CONF_CTX *cctx, const char **pcmd)
 611 {
 612     if (!pcmd || !*pcmd)
 613         return 0;
 614     /* If a prefix is set, check and skip */
 615     if (cctx->prefix) {
 616         if (strlen(*pcmd) <= cctx->prefixlen)
 617             return 0;
 618         if (cctx->flags & SSL_CONF_FLAG_CMDLINE &&
 619             strncmp(*pcmd, cctx->prefix, cctx->prefixlen))
 620             return 0;
 621         if (cctx->flags & SSL_CONF_FLAG_FILE &&
 622             strncasecmp(*pcmd, cctx->prefix, cctx->prefixlen))
 623             return 0;
 624         *pcmd += cctx->prefixlen;
 625     } else if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
 626         if (**pcmd != '-' || !(*pcmd)[1])
 627             return 0;
 628         *pcmd += 1;
 629     }
 630     return 1;
 631 }
 632
 633 /* Determine if a command is allowed according to cctx flags */
 634 static int ssl_conf_cmd_allowed(SSL_CONF_CTX *cctx,
 635                                 const ssl_conf_cmd_tbl * t)
 636 {
 637     unsigned int tfl = t->flags;
 638     unsigned int cfl = cctx->flags;
 639     if ((tfl & SSL_CONF_FLAG_SERVER) && !(cfl & SSL_CONF_FLAG_SERVER))
 640         return 0;
 641     if ((tfl & SSL_CONF_FLAG_CLIENT) && !(cfl & SSL_CONF_FLAG_CLIENT))
 642         return 0;
 643     if ((tfl & SSL_CONF_FLAG_CERTIFICATE)
 644         && !(cfl & SSL_CONF_FLAG_CERTIFICATE))
 645         return 0;
 646     return 1;
 647 }
 648
 649 static const ssl_conf_cmd_tbl *ssl_conf_cmd_lookup(SSL_CONF_CTX *cctx,
 650                                                    const char *cmd)
 651 {
 652     const ssl_conf_cmd_tbl *t;
 653     size_t i;
 654     if (cmd == NULL)
 655         return NULL;
 656
 657     /* Look for matching parameter name in table */
 658     for (i = 0, t = ssl_conf_cmds; i < OSSL_NELEM(ssl_conf_cmds); i++, t++) {
 659         if (ssl_conf_cmd_allowed(cctx, t)) {
 660             if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
 661                 if (t->str_cmdline && strcmp(t->str_cmdline, cmd) == 0)
 662                     return t;
 663             }
 664             if (cctx->flags & SSL_CONF_FLAG_FILE) {
 665                 if (t->str_file && strcasecmp(t->str_file, cmd) == 0)
 666                     return t;
 667             }
 668         }
 669     }
 670     return NULL;
 671 }
 672
 673 static int ctrl_switch_option(SSL_CONF_CTX *cctx,
 674                               const ssl_conf_cmd_tbl * cmd)
 675 {
 676     /* Find index of command in table */
 677     size_t idx = cmd - ssl_conf_cmds;
 678     const ssl_switch_tbl *scmd;
 679     /* Sanity check index */
 680     if (idx >= OSSL_NELEM(ssl_cmd_switches))
 681         return 0;
 682     /* Obtain switches entry with same index */
 683     scmd = ssl_cmd_switches + idx;
 684     ssl_set_option(cctx, scmd->name_flags, scmd->option_value, 1);
 685     return 1;
 686 }
 687
 688 int SSL_CONF_cmd(SSL_CONF_CTX *cctx, const char *cmd, const char *value)
 689 {
 690     const ssl_conf_cmd_tbl *runcmd;
 691     if (cmd == NULL) {
 692         SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_INVALID_NULL_CMD_NAME);
 693         return 0;
 694     }
 695
 696     if (!ssl_conf_cmd_skip_prefix(cctx, &cmd))
 697         return -2;
 698
 699     runcmd = ssl_conf_cmd_lookup(cctx, cmd);
 700
 701     if (runcmd) {
 702         int rv;
 703         if (runcmd->value_type == SSL_CONF_TYPE_NONE) {
 704             return ctrl_switch_option(cctx, runcmd);
 705         }
 706         if (value == NULL)
 707             return -3;
 708         rv = runcmd->cmd(cctx, value);
 709         if (rv > 0)
 710             return 2;
 711         if (rv == -2)
 712             return -2;
 713         if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS) {
 714             SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_BAD_VALUE);
 715             ERR_add_error_data(4, "cmd=", cmd, ", value=", value);
 716         }
 717         return 0;
 718     }
 719
 720     if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS) {
 721         SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_UNKNOWN_CMD_NAME);
 722         ERR_add_error_data(2, "cmd=", cmd);
 723     }
 724
 725     return -2;
 726 }
 727
 728 int SSL_CONF_cmd_argv(SSL_CONF_CTX *cctx, int *pargc, char ***pargv)
 729 {
 730     int rv;
 731     const char *arg = NULL, *argn;
 732     if (pargc && *pargc == 0)
 733         return 0;
 734     if (!pargc || *pargc > 0)
 735         arg = **pargv;
 736     if (arg == NULL)
 737         return 0;
 738     if (!pargc || *pargc > 1)
 739         argn = (*pargv)[1];
 740     else
 741         argn = NULL;
 742     cctx->flags &= ~SSL_CONF_FLAG_FILE;
 743     cctx->flags |= SSL_CONF_FLAG_CMDLINE;
 744     rv = SSL_CONF_cmd(cctx, arg, argn);
 745     if (rv > 0) {
 746         /* Success: update pargc, pargv */
 747         (*pargv) += rv;
 748         if (pargc)
 749             (*pargc) -= rv;
 750         return rv;
 751     }
 752     /* Unknown switch: indicate no arguments processed */
 753     if (rv == -2)
 754         return 0;
 755     /* Some error occurred processing command, return fatal error */
 756     if (rv == 0)
 757         return -1;
 758     return rv;
 759 }
 760
 761 int SSL_CONF_cmd_value_type(SSL_CONF_CTX *cctx, const char *cmd)
 762 {
 763     if (ssl_conf_cmd_skip_prefix(cctx, &cmd)) {
 764         const ssl_conf_cmd_tbl *runcmd;
 765         runcmd = ssl_conf_cmd_lookup(cctx, cmd);
 766         if (runcmd)
 767             return runcmd->value_type;
 768     }
 769     return SSL_CONF_TYPE_UNKNOWN;
 770 }
 771
 772 SSL_CONF_CTX *SSL_CONF_CTX_new(void)
 773 {
 774     SSL_CONF_CTX *ret = OPENSSL_malloc(sizeof(*ret));
 775     size_t i;
 776
 777     if (ret) {
 778         ret->flags = 0;
 779         ret->prefix = NULL;
 780         ret->prefixlen = 0;
 781         ret->ssl = NULL;
 782         ret->ctx = NULL;
 783         ret->poptions = NULL;
 784         ret->pcert_flags = NULL;
 785         ret->pvfy_flags = NULL;
 786         ret->tbl = NULL;
 787         ret->ntbl = 0;
 788         for (i = 0; i < SSL_PKEY_NUM; i++)
 789             ret->cert_filename[i] = NULL;
 790         ret->canames = NULL;
 791     }
 792     return ret;
 793 }
 794
 795 int SSL_CONF_CTX_finish(SSL_CONF_CTX *cctx)
 796 {
 797     /* See if any certificates are missing private keys */
 798     size_t i;
 799     CERT *c = NULL;
 800     if (cctx->ctx)
 801         c = cctx->ctx->cert;
 802     else if (cctx->ssl)
 803         c = cctx->ssl->cert;
 804     if (c && cctx->flags & SSL_CONF_FLAG_REQUIRE_PRIVATE) {
 805         for (i = 0; i < SSL_PKEY_NUM; i++) {
 806             const char *p = cctx->cert_filename[i];
 807             /*
 808              * If missing private key try to load one from certificate file
 809              */
 810             if (p && !c->pkeys[i].privatekey) {
 811                 if (!cmd_PrivateKey(cctx, p))
 812                     return 0;
 813             }
 814         }
 815     }
 816     if (cctx->canames) {
 817         if (cctx->ssl)
 818             SSL_set_client_CA_list(cctx->ssl, cctx->canames);
 819         else if (cctx->ctx)
 820             SSL_CTX_set_client_CA_list(cctx->ctx, cctx->canames);
 821         else
 822             sk_X509_NAME_pop_free(cctx->canames, X509_NAME_free);
 823         cctx->canames = NULL;
 824     }
 825     return 1;
 826 }
 827
 828 void SSL_CONF_CTX_free(SSL_CONF_CTX *cctx)
 829 {
 830     if (cctx) {
 831         size_t i;
 832         for (i = 0; i < SSL_PKEY_NUM; i++)
 833             OPENSSL_free(cctx->cert_filename[i]);
 834         OPENSSL_free(cctx->prefix);
 835         OPENSSL_free(cctx);
 836         sk_X509_NAME_pop_free(cctx->canames, X509_NAME_free);
 837     }
 838 }
 839
 840 unsigned int SSL_CONF_CTX_set_flags(SSL_CONF_CTX *cctx, unsigned int flags)
 841 {
 842     cctx->flags |= flags;
 843     return cctx->flags;
 844 }
 845
 846 unsigned int SSL_CONF_CTX_clear_flags(SSL_CONF_CTX *cctx, unsigned int flags)
 847 {
 848     cctx->flags &= ~flags;
 849     return cctx->flags;
 850 }
 851
 852 int SSL_CONF_CTX_set1_prefix(SSL_CONF_CTX *cctx, const char *pre)
 853 {
 854     char *tmp = NULL;
 855     if (pre) {
 856         tmp = BUF_strdup(pre);
 857         if (tmp == NULL)
 858             return 0;
 859     }
 860     OPENSSL_free(cctx->prefix);
 861     cctx->prefix = tmp;
 862     if (tmp)
 863         cctx->prefixlen = strlen(tmp);
 864     else
 865         cctx->prefixlen = 0;
 866     return 1;
 867 }
 868
 869 void SSL_CONF_CTX_set_ssl(SSL_CONF_CTX *cctx, SSL *ssl)
 870 {
 871     cctx->ssl = ssl;
 872     cctx->ctx = NULL;
 873     if (ssl) {
 874         cctx->poptions = &ssl->options;
 875         cctx->pcert_flags = &ssl->cert->cert_flags;
 876         cctx->pvfy_flags = &ssl->verify_mode;
 877     } else {
 878         cctx->poptions = NULL;
 879         cctx->pcert_flags = NULL;
 880         cctx->pvfy_flags = NULL;
 881     }
 882 }
 883
 884 void SSL_CONF_CTX_set_ssl_ctx(SSL_CONF_CTX *cctx, SSL_CTX *ctx)
 885 {
 886     cctx->ctx = ctx;
 887     cctx->ssl = NULL;
 888     if (ctx) {
 889         cctx->poptions = &ctx->options;
 890         cctx->pcert_flags = &ctx->cert->cert_flags;
 891         cctx->pvfy_flags = &ctx->verify_mode;
 892     } else {
 893         cctx->poptions = NULL;
 894         cctx->pcert_flags = NULL;
 895         cctx->pvfy_flags = NULL;
 896     }
 897 }