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     /* Pointer to SSL or SSL_CTX min_version field or NULL if none */
 146     int *min_version;
 147     /* Pointer to SSL or SSL_CTX max_version field or NULL if none */
 148     int *max_version;
 149     /* Current flag table being worked on */
 150     const ssl_flag_tbl *tbl;
 151     /* Size of table */
 152     size_t ntbl;
 153     /* Client CA names */
 154     STACK_OF(X509_NAME) *canames;
 155 };
 156
 157 static void ssl_set_option(SSL_CONF_CTX *cctx, unsigned int name_flags,
 158                            unsigned long option_value, int onoff)
 159 {
 160     uint32_t *pflags;
 161     if (cctx->poptions == NULL)
 162         return;
 163     if (name_flags & SSL_TFLAG_INV)
 164         onoff ^= 1;
 165     switch (name_flags & SSL_TFLAG_TYPE_MASK) {
 166
 167     case SSL_TFLAG_CERT:
 168         pflags = cctx->pcert_flags;
 169         break;
 170
 171     case SSL_TFLAG_VFY:
 172         pflags =  cctx->pvfy_flags;
 173         break;
 174
 175     case SSL_TFLAG_OPTION:
 176         pflags = cctx->poptions;
 177         break;
 178
 179     default:
 180         return;
 181
 182     }
 183     if (onoff)
 184         *pflags |= option_value;
 185     else
 186         *pflags &= ~option_value;
 187 }
 188
 189 static int ssl_match_option(SSL_CONF_CTX *cctx, const ssl_flag_tbl *tbl,
 190                             const char *name, int namelen, int onoff)
 191 {
 192     /* If name not relevant for context skip */
 193     if (!(cctx->flags & tbl->name_flags & SSL_TFLAG_BOTH))
 194         return 0;
 195     if (namelen == -1) {
 196         if (strcmp(tbl->name, name))
 197             return 0;
 198     } else if (tbl->namelen != namelen
 199                || strncasecmp(tbl->name, name, namelen))
 200         return 0;
 201     ssl_set_option(cctx, tbl->name_flags, tbl->option_value, onoff);
 202     return 1;
 203 }
 204
 205 static int ssl_set_option_list(const char *elem, int len, void *usr)
 206 {
 207     SSL_CONF_CTX *cctx = usr;
 208     size_t i;
 209     const ssl_flag_tbl *tbl;
 210     int onoff = 1;
 211     /*
 212      * len == -1 indicates not being called in list context, just for single
 213      * command line switches, so don't allow +, -.
 214      */
 215     if (elem == NULL)
 216         return 0;
 217     if (len != -1) {
 218         if (*elem == '+') {
 219             elem++;
 220             len--;
 221             onoff = 1;
 222         } else if (*elem == '-') {
 223             elem++;
 224             len--;
 225             onoff = 0;
 226         }
 227     }
 228     for (i = 0, tbl = cctx->tbl; i < cctx->ntbl; i++, tbl++) {
 229         if (ssl_match_option(cctx, tbl, elem, len, onoff))
 230             return 1;
 231     }
 232     return 0;
 233 }
 234
 235 /* Set supported signature algorithms */
 236 static int cmd_SignatureAlgorithms(SSL_CONF_CTX *cctx, const char *value)
 237 {
 238     int rv;
 239     if (cctx->ssl)
 240         rv = SSL_set1_sigalgs_list(cctx->ssl, value);
 241     /* NB: ctx == NULL performs syntax checking only */
 242     else
 243         rv = SSL_CTX_set1_sigalgs_list(cctx->ctx, value);
 244     return rv > 0;
 245 }
 246
 247 /* Set supported client signature algorithms */
 248 static int cmd_ClientSignatureAlgorithms(SSL_CONF_CTX *cctx,
 249                                          const char *value)
 250 {
 251     int rv;
 252     if (cctx->ssl)
 253         rv = SSL_set1_client_sigalgs_list(cctx->ssl, value);
 254     /* NB: ctx == NULL performs syntax checking only */
 255     else
 256         rv = SSL_CTX_set1_client_sigalgs_list(cctx->ctx, value);
 257     return rv > 0;
 258 }
 259
 260 static int cmd_Curves(SSL_CONF_CTX *cctx, const char *value)
 261 {
 262     int rv;
 263     if (cctx->ssl)
 264         rv = SSL_set1_curves_list(cctx->ssl, value);
 265     /* NB: ctx == NULL performs syntax checking only */
 266     else
 267         rv = SSL_CTX_set1_curves_list(cctx->ctx, value);
 268     return rv > 0;
 269 }
 270
 271 #ifndef OPENSSL_NO_EC
 272 /* ECDH temporary parameters */
 273 static int cmd_ECDHParameters(SSL_CONF_CTX *cctx, const char *value)
 274 {
 275     int rv = 1;
 276     EC_KEY *ecdh;
 277     int nid;
 278
 279     nid = EC_curve_nist2nid(value);
 280     if (nid == NID_undef)
 281         nid = OBJ_sn2nid(value);
 282     if (nid == 0)
 283         return 0;
 284     ecdh = EC_KEY_new_by_curve_name(nid);
 285     if (!ecdh)
 286         return 0;
 287     if (cctx->ctx)
 288         rv = SSL_CTX_set_tmp_ecdh(cctx->ctx, ecdh);
 289     else if (cctx->ssl)
 290         rv = SSL_set_tmp_ecdh(cctx->ssl, ecdh);
 291     EC_KEY_free(ecdh);
 292
 293     return rv > 0;
 294 }
 295 #endif
 296 static int cmd_CipherString(SSL_CONF_CTX *cctx, const char *value)
 297 {
 298     int rv = 1;
 299     if (cctx->ctx)
 300         rv = SSL_CTX_set_cipher_list(cctx->ctx, value);
 301     if (cctx->ssl)
 302         rv = SSL_set_cipher_list(cctx->ssl, value);
 303     return rv > 0;
 304 }
 305
 306 static int cmd_Protocol(SSL_CONF_CTX *cctx, const char *value)
 307 {
 308     static const ssl_flag_tbl ssl_protocol_list[] = {
 309         SSL_FLAG_TBL_INV("ALL", SSL_OP_NO_SSL_MASK),
 310         SSL_FLAG_TBL_INV("SSLv2", SSL_OP_NO_SSLv2),
 311         SSL_FLAG_TBL_INV("SSLv3", SSL_OP_NO_SSLv3),
 312         SSL_FLAG_TBL_INV("TLSv1", SSL_OP_NO_TLSv1),
 313         SSL_FLAG_TBL_INV("TLSv1.1", SSL_OP_NO_TLSv1_1),
 314         SSL_FLAG_TBL_INV("TLSv1.2", SSL_OP_NO_TLSv1_2),
 315         SSL_FLAG_TBL_INV("DTLSv1", SSL_OP_NO_DTLSv1),
 316         SSL_FLAG_TBL_INV("DTLSv1.2", SSL_OP_NO_DTLSv1_2)
 317     };
 318     cctx->tbl = ssl_protocol_list;
 319     cctx->ntbl = OSSL_NELEM(ssl_protocol_list);
 320     return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
 321 }
 322
 323 /*
 324  * protocol_from_string - converts a protocol version string to a number
 325  *
 326  * Returns -1 on failure or the version on success
 327  */
 328 static int protocol_from_string(const char *value)
 329 {
 330     struct protocol_versions {
 331         const char *name;
 332         int version;
 333     };
 334     static const struct protocol_versions versions[] = {
 335         {"None", 0},
 336         {"SSLv3", SSL3_VERSION},
 337         {"TLSv1", TLS1_VERSION},
 338         {"TLSv1.1", TLS1_1_VERSION},
 339         {"TLSv1.2", TLS1_2_VERSION},
 340         {"DTLSv1", DTLS1_VERSION},
 341         {"DTLSv1.2", DTLS1_2_VERSION}};
 342     size_t i;
 343     size_t n = OSSL_NELEM(versions);
 344
 345     for (i = 0; i < n; i++)
 346         if (strcmp(versions[i].name, value) == 0)
 347             return versions[i].version;
 348     return -1;
 349 }
 350
 351 static int min_max_proto(SSL_CONF_CTX *cctx, const char *value, int *bound)
 352 {
 353     int method_version;
 354     int new_version;
 355
 356     if (cctx->ctx != NULL)
 357         method_version = cctx->ctx->method->version;
 358     else if (cctx->ssl != NULL)
 359         method_version = cctx->ssl->ctx->method->version;
 360     else
 361         return 0;
 362     if ((new_version = protocol_from_string(value)) < 0)
 363         return 0;
 364     return ssl_set_version_bound(method_version, new_version, bound);
 365 }
 366
 367 /*
 368  * cmd_MinProtocol - Set min protocol version
 369  * @cctx: config structure to save settings in
 370  * @value: The min protocol version in string form
 371  *
 372  * Returns 1 on success and 0 on failure.
 373  */
 374 static int cmd_MinProtocol(SSL_CONF_CTX *cctx, const char *value)
 375 {
 376     return min_max_proto(cctx, value, cctx->min_version);
 377 }
 378
 379 /*
 380  * cmd_MaxProtocol - Set max protocol version
 381  * @cctx: config structure to save settings in
 382  * @value: The max protocol version in string form
 383  *
 384  * Returns 1 on success and 0 on failure.
 385  */
 386 static int cmd_MaxProtocol(SSL_CONF_CTX *cctx, const char *value)
 387 {
 388     return min_max_proto(cctx, value, cctx->max_version);
 389 }
 390
 391 static int cmd_Options(SSL_CONF_CTX *cctx, const char *value)
 392 {
 393     static const ssl_flag_tbl ssl_option_list[] = {
 394         SSL_FLAG_TBL_INV("SessionTicket", SSL_OP_NO_TICKET),
 395         SSL_FLAG_TBL_INV("EmptyFragments",
 396                          SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS),
 397         SSL_FLAG_TBL("Bugs", SSL_OP_ALL),
 398         SSL_FLAG_TBL_INV("Compression", SSL_OP_NO_COMPRESSION),
 399         SSL_FLAG_TBL_SRV("ServerPreference", SSL_OP_CIPHER_SERVER_PREFERENCE),
 400         SSL_FLAG_TBL_SRV("NoResumptionOnRenegotiation",
 401                          SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION),
 402         SSL_FLAG_TBL_SRV("DHSingle", SSL_OP_SINGLE_DH_USE),
 403         SSL_FLAG_TBL_SRV("ECDHSingle", SSL_OP_SINGLE_ECDH_USE),
 404         SSL_FLAG_TBL("UnsafeLegacyRenegotiation",
 405                      SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION),
 406     };
 407     if (value == NULL)
 408         return -3;
 409     cctx->tbl = ssl_option_list;
 410     cctx->ntbl = OSSL_NELEM(ssl_option_list);
 411     return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
 412 }
 413
 414 static int cmd_VerifyMode(SSL_CONF_CTX *cctx, const char *value)
 415 {
 416     static const ssl_flag_tbl ssl_vfy_list[] = {
 417         SSL_FLAG_VFY_CLI("Peer", SSL_VERIFY_PEER),
 418         SSL_FLAG_VFY_SRV("Request", SSL_VERIFY_PEER),
 419         SSL_FLAG_VFY_SRV("Require",
 420                          SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT),
 421         SSL_FLAG_VFY_SRV("Once", SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE)
 422     };
 423     if (value == NULL)
 424         return -3;
 425     cctx->tbl = ssl_vfy_list;
 426     cctx->ntbl = OSSL_NELEM(ssl_vfy_list);
 427     return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
 428 }
 429
 430 static int cmd_Certificate(SSL_CONF_CTX *cctx, const char *value)
 431 {
 432     int rv = 1;
 433     CERT *c = NULL;
 434     if (cctx->ctx) {
 435         rv = SSL_CTX_use_certificate_chain_file(cctx->ctx, value);
 436         c = cctx->ctx->cert;
 437     }
 438     if (cctx->ssl) {
 439         rv = SSL_use_certificate_chain_file(cctx->ssl, value);
 440         c = cctx->ssl->cert;
 441     }
 442     if (rv > 0 && c && cctx->flags & SSL_CONF_FLAG_REQUIRE_PRIVATE) {
 443         char **pfilename = &cctx->cert_filename[c->key - c->pkeys];
 444         OPENSSL_free(*pfilename);
 445         *pfilename = OPENSSL_strdup(value);
 446         if (!*pfilename)
 447             rv = 0;
 448     }
 449
 450     return rv > 0;
 451 }
 452
 453 static int cmd_PrivateKey(SSL_CONF_CTX *cctx, const char *value)
 454 {
 455     int rv = 1;
 456     if (!(cctx->flags & SSL_CONF_FLAG_CERTIFICATE))
 457         return -2;
 458     if (cctx->ctx)
 459         rv = SSL_CTX_use_PrivateKey_file(cctx->ctx, value, SSL_FILETYPE_PEM);
 460     if (cctx->ssl)
 461         rv = SSL_use_PrivateKey_file(cctx->ssl, value, SSL_FILETYPE_PEM);
 462     return rv > 0;
 463 }
 464
 465 static int cmd_ServerInfoFile(SSL_CONF_CTX *cctx, const char *value)
 466 {
 467     int rv = 1;
 468     if (cctx->ctx)
 469         rv = SSL_CTX_use_serverinfo_file(cctx->ctx, value);
 470     return rv > 0;
 471 }
 472
 473 static int do_store(SSL_CONF_CTX *cctx,
 474                     const char *CAfile, const char *CApath, int verify_store)
 475 {
 476     CERT *cert;
 477     X509_STORE **st;
 478     if (cctx->ctx)
 479         cert = cctx->ctx->cert;
 480     else if (cctx->ssl)
 481         cert = cctx->ssl->cert;
 482     else
 483         return 1;
 484     st = verify_store ? &cert->verify_store : &cert->chain_store;
 485     if (*st == NULL) {
 486         *st = X509_STORE_new();
 487         if (*st == NULL)
 488             return 0;
 489     }
 490     return X509_STORE_load_locations(*st, CAfile, CApath) > 0;
 491 }
 492
 493 static int cmd_ChainCAPath(SSL_CONF_CTX *cctx, const char *value)
 494 {
 495     return do_store(cctx, NULL, value, 0);
 496 }
 497
 498 static int cmd_ChainCAFile(SSL_CONF_CTX *cctx, const char *value)
 499 {
 500     return do_store(cctx, value, NULL, 0);
 501 }
 502
 503 static int cmd_VerifyCAPath(SSL_CONF_CTX *cctx, const char *value)
 504 {
 505     return do_store(cctx, NULL, value, 1);
 506 }
 507
 508 static int cmd_VerifyCAFile(SSL_CONF_CTX *cctx, const char *value)
 509 {
 510     return do_store(cctx, value, NULL, 1);
 511 }
 512
 513 static int cmd_ClientCAFile(SSL_CONF_CTX *cctx, const char *value)
 514 {
 515     if (cctx->canames == NULL)
 516         cctx->canames = sk_X509_NAME_new_null();
 517     if (cctx->canames == NULL)
 518         return 0;
 519     return SSL_add_file_cert_subjects_to_stack(cctx->canames, value);
 520 }
 521
 522 static int cmd_ClientCAPath(SSL_CONF_CTX *cctx, const char *value)
 523 {
 524     if (cctx->canames == NULL)
 525         cctx->canames = sk_X509_NAME_new_null();
 526     if (cctx->canames == NULL)
 527         return 0;
 528     return SSL_add_dir_cert_subjects_to_stack(cctx->canames, value);
 529 }
 530
 531 #ifndef OPENSSL_NO_DH
 532 static int cmd_DHParameters(SSL_CONF_CTX *cctx, const char *value)
 533 {
 534     int rv = 0;
 535     DH *dh = NULL;
 536     BIO *in = NULL;
 537     if (cctx->ctx || cctx->ssl) {
 538         in = BIO_new(BIO_s_file());
 539         if (in == NULL)
 540             goto end;
 541         if (BIO_read_filename(in, value) <= 0)
 542             goto end;
 543         dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL);
 544         if (dh == NULL)
 545             goto end;
 546     } else
 547         return 1;
 548     if (cctx->ctx)
 549         rv = SSL_CTX_set_tmp_dh(cctx->ctx, dh);
 550     if (cctx->ssl)
 551         rv = SSL_set_tmp_dh(cctx->ssl, dh);
 552  end:
 553     DH_free(dh);
 554     BIO_free(in);
 555     return rv > 0;
 556 }
 557 #endif
 558 typedef struct {
 559     int (*cmd) (SSL_CONF_CTX *cctx, const char *value);
 560     const char *str_file;
 561     const char *str_cmdline;
 562     unsigned short flags;
 563     unsigned short value_type;
 564 } ssl_conf_cmd_tbl;
 565
 566 /* Table of supported parameters */
 567
 568 #define SSL_CONF_CMD(name, cmdopt, flags, type) \
 569         {cmd_##name, #name, cmdopt, flags, type}
 570
 571 #define SSL_CONF_CMD_STRING(name, cmdopt, flags) \
 572         SSL_CONF_CMD(name, cmdopt, flags, SSL_CONF_TYPE_STRING)
 573
 574 #define SSL_CONF_CMD_SWITCH(name, flags) \
 575         {0, NULL, name, flags, SSL_CONF_TYPE_NONE}
 576
 577 /* See apps/apps.h if you change this table. */
 578 static const ssl_conf_cmd_tbl ssl_conf_cmds[] = {
 579     SSL_CONF_CMD_SWITCH("no_ssl3", 0),
 580     SSL_CONF_CMD_SWITCH("no_tls1", 0),
 581     SSL_CONF_CMD_SWITCH("no_tls1_1", 0),
 582     SSL_CONF_CMD_SWITCH("no_tls1_2", 0),
 583     SSL_CONF_CMD_SWITCH("bugs", 0),
 584     SSL_CONF_CMD_SWITCH("no_comp", 0),
 585     SSL_CONF_CMD_SWITCH("comp", 0),
 586     SSL_CONF_CMD_SWITCH("ecdh_single", SSL_CONF_FLAG_SERVER),
 587     SSL_CONF_CMD_SWITCH("no_ticket", 0),
 588     SSL_CONF_CMD_SWITCH("serverpref", SSL_CONF_FLAG_SERVER),
 589     SSL_CONF_CMD_SWITCH("legacy_renegotiation", 0),
 590     SSL_CONF_CMD_SWITCH("legacy_server_connect", SSL_CONF_FLAG_SERVER),
 591     SSL_CONF_CMD_SWITCH("no_resumption_on_reneg", SSL_CONF_FLAG_SERVER),
 592     SSL_CONF_CMD_SWITCH("no_legacy_server_connect", SSL_CONF_FLAG_SERVER),
 593     SSL_CONF_CMD_SWITCH("strict", 0),
 594 #ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
 595     SSL_CONF_CMD_SWITCH("debug_broken_protocol", 0),
 596 #endif
 597     SSL_CONF_CMD_STRING(SignatureAlgorithms, "sigalgs", 0),
 598     SSL_CONF_CMD_STRING(ClientSignatureAlgorithms, "client_sigalgs", 0),
 599     SSL_CONF_CMD_STRING(Curves, "curves", 0),
 600 #ifndef OPENSSL_NO_EC
 601     SSL_CONF_CMD_STRING(ECDHParameters, "named_curve", SSL_CONF_FLAG_SERVER),
 602 #endif
 603     SSL_CONF_CMD_STRING(CipherString, "cipher", 0),
 604     SSL_CONF_CMD_STRING(Protocol, NULL, 0),
 605     SSL_CONF_CMD_STRING(MinProtocol, "min_protocol", SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CLIENT),
 606     SSL_CONF_CMD_STRING(MaxProtocol, "max_protocol", SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CLIENT),
 607     SSL_CONF_CMD_STRING(Options, NULL, 0),
 608     SSL_CONF_CMD_STRING(VerifyMode, NULL, 0),
 609     SSL_CONF_CMD(Certificate, "cert", SSL_CONF_FLAG_CERTIFICATE,
 610                  SSL_CONF_TYPE_FILE),
 611     SSL_CONF_CMD(PrivateKey, "key", SSL_CONF_FLAG_CERTIFICATE,
 612                  SSL_CONF_TYPE_FILE),
 613     SSL_CONF_CMD(ServerInfoFile, NULL,
 614                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 615                  SSL_CONF_TYPE_FILE),
 616     SSL_CONF_CMD(ChainCAPath, "chainCApath", SSL_CONF_FLAG_CERTIFICATE,
 617                  SSL_CONF_TYPE_DIR),
 618     SSL_CONF_CMD(ChainCAFile, "chainCAfile", SSL_CONF_FLAG_CERTIFICATE,
 619                  SSL_CONF_TYPE_FILE),
 620     SSL_CONF_CMD(VerifyCAPath, "verifyCApath", SSL_CONF_FLAG_CERTIFICATE,
 621                  SSL_CONF_TYPE_DIR),
 622     SSL_CONF_CMD(VerifyCAFile, "verifyCAfile", SSL_CONF_FLAG_CERTIFICATE,
 623                  SSL_CONF_TYPE_FILE),
 624     SSL_CONF_CMD(ClientCAFile, NULL,
 625                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 626                  SSL_CONF_TYPE_FILE),
 627     SSL_CONF_CMD(ClientCAPath, NULL,
 628                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 629                  SSL_CONF_TYPE_DIR),
 630 #ifndef OPENSSL_NO_DH
 631     SSL_CONF_CMD(DHParameters, "dhparam",
 632                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 633                  SSL_CONF_TYPE_FILE)
 634 #endif
 635 };
 636
 637 /* Supported switches: must match order of switches in ssl_conf_cmds */
 638 static const ssl_switch_tbl ssl_cmd_switches[] = {
 639     {SSL_OP_NO_SSLv3, 0},       /* no_ssl3 */
 640     {SSL_OP_NO_TLSv1, 0},       /* no_tls1 */
 641     {SSL_OP_NO_TLSv1_1, 0},     /* no_tls1_1 */
 642     {SSL_OP_NO_TLSv1_2, 0},     /* no_tls1_2 */
 643     {SSL_OP_ALL, 0},            /* bugs */
 644     {SSL_OP_NO_COMPRESSION, 0}, /* no_comp */
 645     {SSL_OP_NO_COMPRESSION, SSL_TFLAG_INV}, /* comp */
 646     {SSL_OP_SINGLE_ECDH_USE, 0}, /* ecdh_single */
 647     {SSL_OP_NO_TICKET, 0},      /* no_ticket */
 648     {SSL_OP_CIPHER_SERVER_PREFERENCE, 0}, /* serverpref */
 649     /* legacy_renegotiation */
 650     {SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION, 0},
 651     /* legacy_server_connect */
 652     {SSL_OP_LEGACY_SERVER_CONNECT, 0},
 653     /* no_resumption_on_reneg */
 654     {SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION, 0},
 655     /* no_legacy_server_connect */
 656     {SSL_OP_LEGACY_SERVER_CONNECT, SSL_TFLAG_INV},
 657     {SSL_CERT_FLAG_TLS_STRICT, SSL_TFLAG_CERT}, /* strict */
 658 #ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
 659     {SSL_CERT_FLAG_BROKEN_PROTOCOL, SSL_TFLAG_CERT} /* debug_broken_protocol */
 660 #endif
 661 };
 662
 663 static int ssl_conf_cmd_skip_prefix(SSL_CONF_CTX *cctx, const char **pcmd)
 664 {
 665     if (!pcmd || !*pcmd)
 666         return 0;
 667     /* If a prefix is set, check and skip */
 668     if (cctx->prefix) {
 669         if (strlen(*pcmd) <= cctx->prefixlen)
 670             return 0;
 671         if (cctx->flags & SSL_CONF_FLAG_CMDLINE &&
 672             strncmp(*pcmd, cctx->prefix, cctx->prefixlen))
 673             return 0;
 674         if (cctx->flags & SSL_CONF_FLAG_FILE &&
 675             strncasecmp(*pcmd, cctx->prefix, cctx->prefixlen))
 676             return 0;
 677         *pcmd += cctx->prefixlen;
 678     } else if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
 679         if (**pcmd != '-' || !(*pcmd)[1])
 680             return 0;
 681         *pcmd += 1;
 682     }
 683     return 1;
 684 }
 685
 686 /* Determine if a command is allowed according to cctx flags */
 687 static int ssl_conf_cmd_allowed(SSL_CONF_CTX *cctx,
 688                                 const ssl_conf_cmd_tbl * t)
 689 {
 690     unsigned int tfl = t->flags;
 691     unsigned int cfl = cctx->flags;
 692     if ((tfl & SSL_CONF_FLAG_SERVER) && !(cfl & SSL_CONF_FLAG_SERVER))
 693         return 0;
 694     if ((tfl & SSL_CONF_FLAG_CLIENT) && !(cfl & SSL_CONF_FLAG_CLIENT))
 695         return 0;
 696     if ((tfl & SSL_CONF_FLAG_CERTIFICATE)
 697         && !(cfl & SSL_CONF_FLAG_CERTIFICATE))
 698         return 0;
 699     return 1;
 700 }
 701
 702 static const ssl_conf_cmd_tbl *ssl_conf_cmd_lookup(SSL_CONF_CTX *cctx,
 703                                                    const char *cmd)
 704 {
 705     const ssl_conf_cmd_tbl *t;
 706     size_t i;
 707     if (cmd == NULL)
 708         return NULL;
 709
 710     /* Look for matching parameter name in table */
 711     for (i = 0, t = ssl_conf_cmds; i < OSSL_NELEM(ssl_conf_cmds); i++, t++) {
 712         if (ssl_conf_cmd_allowed(cctx, t)) {
 713             if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
 714                 if (t->str_cmdline && strcmp(t->str_cmdline, cmd) == 0)
 715                     return t;
 716             }
 717             if (cctx->flags & SSL_CONF_FLAG_FILE) {
 718                 if (t->str_file && strcasecmp(t->str_file, cmd) == 0)
 719                     return t;
 720             }
 721         }
 722     }
 723     return NULL;
 724 }
 725
 726 static int ctrl_switch_option(SSL_CONF_CTX *cctx,
 727                               const ssl_conf_cmd_tbl * cmd)
 728 {
 729     /* Find index of command in table */
 730     size_t idx = cmd - ssl_conf_cmds;
 731     const ssl_switch_tbl *scmd;
 732     /* Sanity check index */
 733     if (idx >= OSSL_NELEM(ssl_cmd_switches))
 734         return 0;
 735     /* Obtain switches entry with same index */
 736     scmd = ssl_cmd_switches + idx;
 737     ssl_set_option(cctx, scmd->name_flags, scmd->option_value, 1);
 738     return 1;
 739 }
 740
 741 int SSL_CONF_cmd(SSL_CONF_CTX *cctx, const char *cmd, const char *value)
 742 {
 743     const ssl_conf_cmd_tbl *runcmd;
 744     if (cmd == NULL) {
 745         SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_INVALID_NULL_CMD_NAME);
 746         return 0;
 747     }
 748
 749     if (!ssl_conf_cmd_skip_prefix(cctx, &cmd))
 750         return -2;
 751
 752     runcmd = ssl_conf_cmd_lookup(cctx, cmd);
 753
 754     if (runcmd) {
 755         int rv;
 756         if (runcmd->value_type == SSL_CONF_TYPE_NONE) {
 757             return ctrl_switch_option(cctx, runcmd);
 758         }
 759         if (value == NULL)
 760             return -3;
 761         rv = runcmd->cmd(cctx, value);
 762         if (rv > 0)
 763             return 2;
 764         if (rv == -2)
 765             return -2;
 766         if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS) {
 767             SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_BAD_VALUE);
 768             ERR_add_error_data(4, "cmd=", cmd, ", value=", value);
 769         }
 770         return 0;
 771     }
 772
 773     if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS) {
 774         SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_UNKNOWN_CMD_NAME);
 775         ERR_add_error_data(2, "cmd=", cmd);
 776     }
 777
 778     return -2;
 779 }
 780
 781 int SSL_CONF_cmd_argv(SSL_CONF_CTX *cctx, int *pargc, char ***pargv)
 782 {
 783     int rv;
 784     const char *arg = NULL, *argn;
 785     if (pargc && *pargc == 0)
 786         return 0;
 787     if (!pargc || *pargc > 0)
 788         arg = **pargv;
 789     if (arg == NULL)
 790         return 0;
 791     if (!pargc || *pargc > 1)
 792         argn = (*pargv)[1];
 793     else
 794         argn = NULL;
 795     cctx->flags &= ~SSL_CONF_FLAG_FILE;
 796     cctx->flags |= SSL_CONF_FLAG_CMDLINE;
 797     rv = SSL_CONF_cmd(cctx, arg, argn);
 798     if (rv > 0) {
 799         /* Success: update pargc, pargv */
 800         (*pargv) += rv;
 801         if (pargc)
 802             (*pargc) -= rv;
 803         return rv;
 804     }
 805     /* Unknown switch: indicate no arguments processed */
 806     if (rv == -2)
 807         return 0;
 808     /* Some error occurred processing command, return fatal error */
 809     if (rv == 0)
 810         return -1;
 811     return rv;
 812 }
 813
 814 int SSL_CONF_cmd_value_type(SSL_CONF_CTX *cctx, const char *cmd)
 815 {
 816     if (ssl_conf_cmd_skip_prefix(cctx, &cmd)) {
 817         const ssl_conf_cmd_tbl *runcmd;
 818         runcmd = ssl_conf_cmd_lookup(cctx, cmd);
 819         if (runcmd)
 820             return runcmd->value_type;
 821     }
 822     return SSL_CONF_TYPE_UNKNOWN;
 823 }
 824
 825 SSL_CONF_CTX *SSL_CONF_CTX_new(void)
 826 {
 827     SSL_CONF_CTX *ret = OPENSSL_zalloc(sizeof(*ret));
 828
 829     return ret;
 830 }
 831
 832 int SSL_CONF_CTX_finish(SSL_CONF_CTX *cctx)
 833 {
 834     /* See if any certificates are missing private keys */
 835     size_t i;
 836     CERT *c = NULL;
 837     if (cctx->ctx)
 838         c = cctx->ctx->cert;
 839     else if (cctx->ssl)
 840         c = cctx->ssl->cert;
 841     if (c && cctx->flags & SSL_CONF_FLAG_REQUIRE_PRIVATE) {
 842         for (i = 0; i < SSL_PKEY_NUM; i++) {
 843             const char *p = cctx->cert_filename[i];
 844             /*
 845              * If missing private key try to load one from certificate file
 846              */
 847             if (p && !c->pkeys[i].privatekey) {
 848                 if (!cmd_PrivateKey(cctx, p))
 849                     return 0;
 850             }
 851         }
 852     }
 853     if (cctx->canames) {
 854         if (cctx->ssl)
 855             SSL_set_client_CA_list(cctx->ssl, cctx->canames);
 856         else if (cctx->ctx)
 857             SSL_CTX_set_client_CA_list(cctx->ctx, cctx->canames);
 858         else
 859             sk_X509_NAME_pop_free(cctx->canames, X509_NAME_free);
 860         cctx->canames = NULL;
 861     }
 862     return 1;
 863 }
 864
 865 void SSL_CONF_CTX_free(SSL_CONF_CTX *cctx)
 866 {
 867     if (cctx) {
 868         size_t i;
 869         for (i = 0; i < SSL_PKEY_NUM; i++)
 870             OPENSSL_free(cctx->cert_filename[i]);
 871         OPENSSL_free(cctx->prefix);
 872         sk_X509_NAME_pop_free(cctx->canames, X509_NAME_free);
 873         OPENSSL_free(cctx);
 874     }
 875 }
 876
 877 unsigned int SSL_CONF_CTX_set_flags(SSL_CONF_CTX *cctx, unsigned int flags)
 878 {
 879     cctx->flags |= flags;
 880     return cctx->flags;
 881 }
 882
 883 unsigned int SSL_CONF_CTX_clear_flags(SSL_CONF_CTX *cctx, unsigned int flags)
 884 {
 885     cctx->flags &= ~flags;
 886     return cctx->flags;
 887 }
 888
 889 int SSL_CONF_CTX_set1_prefix(SSL_CONF_CTX *cctx, const char *pre)
 890 {
 891     char *tmp = NULL;
 892     if (pre) {
 893         tmp = OPENSSL_strdup(pre);
 894         if (tmp == NULL)
 895             return 0;
 896     }
 897     OPENSSL_free(cctx->prefix);
 898     cctx->prefix = tmp;
 899     if (tmp)
 900         cctx->prefixlen = strlen(tmp);
 901     else
 902         cctx->prefixlen = 0;
 903     return 1;
 904 }
 905
 906 void SSL_CONF_CTX_set_ssl(SSL_CONF_CTX *cctx, SSL *ssl)
 907 {
 908     cctx->ssl = ssl;
 909     cctx->ctx = NULL;
 910     if (ssl) {
 911         cctx->poptions = &ssl->options;
 912         cctx->min_version = &ssl->min_proto_version;
 913         cctx->max_version = &ssl->max_proto_version;
 914         cctx->pcert_flags = &ssl->cert->cert_flags;
 915         cctx->pvfy_flags = &ssl->verify_mode;
 916     } else {
 917         cctx->poptions = NULL;
 918         cctx->min_version = NULL;
 919         cctx->max_version = NULL;
 920         cctx->pcert_flags = NULL;
 921         cctx->pvfy_flags = NULL;
 922     }
 923 }
 924
 925 void SSL_CONF_CTX_set_ssl_ctx(SSL_CONF_CTX *cctx, SSL_CTX *ctx)
 926 {
 927     cctx->ctx = ctx;
 928     cctx->ssl = NULL;
 929     if (ctx) {
 930         cctx->poptions = &ctx->options;
 931         cctx->min_version = &ctx->min_proto_version;
 932         cctx->max_version = &ctx->max_proto_version;
 933         cctx->pcert_flags = &ctx->cert->cert_flags;
 934         cctx->pvfy_flags = &ctx->verify_mode;
 935     } else {
 936         cctx->poptions = NULL;
 937         cctx->min_version = NULL;
 938         cctx->max_version = NULL;
 939         cctx->pcert_flags = NULL;
 940         cctx->pvfy_flags = NULL;
 941     }
 942 }