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 #include <stdio.h>
  59 #include "ssl_locl.h"
  60 #include <openssl/conf.h>
  61 #include <openssl/objects.h>
  62 #ifndef OPENSSL_NO_DH
  63 # include <openssl/dh.h>
  64 #endif
  65
  66 /*
  67  * structure holding name tables. This is used for pemitted elements in lists
  68  * such as TLSv1.
  69  */
  70
  71 typedef struct {
  72     const char *name;
  73     int namelen;
  74     unsigned int name_flags;
  75     unsigned long option_value;
  76 } ssl_flag_tbl;
  77
  78 /* Switch table: use for single command line switches like no_tls2 */
  79 typedef struct {
  80     unsigned long option_value;
  81     unsigned int name_flags;
  82 } ssl_switch_tbl;
  83
  84 /* Sense of name is inverted e.g. "TLSv1" will clear SSL_OP_NO_TLSv1 */
  85 #define SSL_TFLAG_INV   0x1
  86 /* Mask for type of flag referred to */
  87 #define SSL_TFLAG_TYPE_MASK 0xf00
  88 /* Flag is for options */
  89 #define SSL_TFLAG_OPTION    0x000
  90 /* Flag is for cert_flags */
  91 #define SSL_TFLAG_CERT      0x100
  92 /* Flag is for verify mode */
  93 #define SSL_TFLAG_VFY       0x200
  94 /* Option can only be used for clients */
  95 #define SSL_TFLAG_CLIENT SSL_CONF_FLAG_CLIENT
  96 /* Option can only be used for servers */
  97 #define SSL_TFLAG_SERVER SSL_CONF_FLAG_SERVER
  98 #define SSL_TFLAG_BOTH (SSL_TFLAG_CLIENT|SSL_TFLAG_SERVER)
  99
 100 #define SSL_FLAG_TBL(str, flag) \
 101         {str, (int)(sizeof(str) - 1), SSL_TFLAG_BOTH, flag}
 102 #define SSL_FLAG_TBL_SRV(str, flag) \
 103         {str, (int)(sizeof(str) - 1), SSL_TFLAG_SERVER, flag}
 104 #define SSL_FLAG_TBL_CLI(str, flag) \
 105         {str, (int)(sizeof(str) - 1), SSL_TFLAG_CLIENT, flag}
 106 #define SSL_FLAG_TBL_INV(str, flag) \
 107         {str, (int)(sizeof(str) - 1), SSL_TFLAG_INV|SSL_TFLAG_BOTH, flag}
 108 #define SSL_FLAG_TBL_SRV_INV(str, flag) \
 109         {str, (int)(sizeof(str) - 1), SSL_TFLAG_INV|SSL_TFLAG_SERVER, flag}
 110 #define SSL_FLAG_TBL_CERT(str, flag) \
 111         {str, (int)(sizeof(str) - 1), SSL_TFLAG_CERT|SSL_TFLAG_BOTH, flag}
 112
 113 #define SSL_FLAG_VFY_CLI(str, flag) \
 114         {str, (int)(sizeof(str) - 1), SSL_TFLAG_VFY | SSL_TFLAG_CLIENT, flag}
 115 #define SSL_FLAG_VFY_SRV(str, flag) \
 116         {str, (int)(sizeof(str) - 1), SSL_TFLAG_VFY | SSL_TFLAG_SERVER, flag}
 117
 118 /*
 119  * Opaque structure containing SSL configuration context.
 120  */
 121
 122 struct ssl_conf_ctx_st {
 123     /*
 124      * Various flags indicating (among other things) which options we will
 125      * recognise.
 126      */
 127     unsigned int flags;
 128     /* Prefix and length of commands */
 129     char *prefix;
 130     size_t prefixlen;
 131     /* SSL_CTX or SSL structure to perform operations on */
 132     SSL_CTX *ctx;
 133     SSL *ssl;
 134     /* Pointer to SSL or SSL_CTX options field or NULL if none */
 135     uint32_t *poptions;
 136     /* Certificate filenames for each type */
 137     char *cert_filename[SSL_PKEY_NUM];
 138     /* Pointer to SSL or SSL_CTX cert_flags or NULL if none */
 139     uint32_t *pcert_flags;
 140     /* Pointer to SSL or SSL_CTX verify_mode or NULL if none */
 141     uint32_t *pvfy_flags;
 142     /* Pointer to SSL or SSL_CTX min_version field or NULL if none */
 143     int *min_version;
 144     /* Pointer to SSL or SSL_CTX max_version field or NULL if none */
 145     int *max_version;
 146     /* Current flag table being worked on */
 147     const ssl_flag_tbl *tbl;
 148     /* Size of table */
 149     size_t ntbl;
 150     /* Client CA names */
 151     STACK_OF(X509_NAME) *canames;
 152 };
 153
 154 static void ssl_set_option(SSL_CONF_CTX *cctx, unsigned int name_flags,
 155                            unsigned long option_value, int onoff)
 156 {
 157     uint32_t *pflags;
 158     if (cctx->poptions == NULL)
 159         return;
 160     if (name_flags & SSL_TFLAG_INV)
 161         onoff ^= 1;
 162     switch (name_flags & SSL_TFLAG_TYPE_MASK) {
 163
 164     case SSL_TFLAG_CERT:
 165         pflags = cctx->pcert_flags;
 166         break;
 167
 168     case SSL_TFLAG_VFY:
 169         pflags =  cctx->pvfy_flags;
 170         break;
 171
 172     case SSL_TFLAG_OPTION:
 173         pflags = cctx->poptions;
 174         break;
 175
 176     default:
 177         return;
 178
 179     }
 180     if (onoff)
 181         *pflags |= option_value;
 182     else
 183         *pflags &= ~option_value;
 184 }
 185
 186 static int ssl_match_option(SSL_CONF_CTX *cctx, const ssl_flag_tbl *tbl,
 187                             const char *name, int namelen, int onoff)
 188 {
 189     /* If name not relevant for context skip */
 190     if (!(cctx->flags & tbl->name_flags & SSL_TFLAG_BOTH))
 191         return 0;
 192     if (namelen == -1) {
 193         if (strcmp(tbl->name, name))
 194             return 0;
 195     } else if (tbl->namelen != namelen
 196                || strncasecmp(tbl->name, name, namelen))
 197         return 0;
 198     ssl_set_option(cctx, tbl->name_flags, tbl->option_value, onoff);
 199     return 1;
 200 }
 201
 202 static int ssl_set_option_list(const char *elem, int len, void *usr)
 203 {
 204     SSL_CONF_CTX *cctx = usr;
 205     size_t i;
 206     const ssl_flag_tbl *tbl;
 207     int onoff = 1;
 208     /*
 209      * len == -1 indicates not being called in list context, just for single
 210      * command line switches, so don't allow +, -.
 211      */
 212     if (elem == NULL)
 213         return 0;
 214     if (len != -1) {
 215         if (*elem == '+') {
 216             elem++;
 217             len--;
 218             onoff = 1;
 219         } else if (*elem == '-') {
 220             elem++;
 221             len--;
 222             onoff = 0;
 223         }
 224     }
 225     for (i = 0, tbl = cctx->tbl; i < cctx->ntbl; i++, tbl++) {
 226         if (ssl_match_option(cctx, tbl, elem, len, onoff))
 227             return 1;
 228     }
 229     return 0;
 230 }
 231
 232 /* Set supported signature algorithms */
 233 static int cmd_SignatureAlgorithms(SSL_CONF_CTX *cctx, const char *value)
 234 {
 235     int rv;
 236     if (cctx->ssl)
 237         rv = SSL_set1_sigalgs_list(cctx->ssl, value);
 238     /* NB: ctx == NULL performs syntax checking only */
 239     else
 240         rv = SSL_CTX_set1_sigalgs_list(cctx->ctx, value);
 241     return rv > 0;
 242 }
 243
 244 /* Set supported client signature algorithms */
 245 static int cmd_ClientSignatureAlgorithms(SSL_CONF_CTX *cctx,
 246                                          const char *value)
 247 {
 248     int rv;
 249     if (cctx->ssl)
 250         rv = SSL_set1_client_sigalgs_list(cctx->ssl, value);
 251     /* NB: ctx == NULL performs syntax checking only */
 252     else
 253         rv = SSL_CTX_set1_client_sigalgs_list(cctx->ctx, value);
 254     return rv > 0;
 255 }
 256
 257 static int cmd_Curves(SSL_CONF_CTX *cctx, const char *value)
 258 {
 259     int rv;
 260     if (cctx->ssl)
 261         rv = SSL_set1_curves_list(cctx->ssl, value);
 262     /* NB: ctx == NULL performs syntax checking only */
 263     else
 264         rv = SSL_CTX_set1_curves_list(cctx->ctx, value);
 265     return rv > 0;
 266 }
 267
 268 #ifndef OPENSSL_NO_EC
 269 /* ECDH temporary parameters */
 270 static int cmd_ECDHParameters(SSL_CONF_CTX *cctx, const char *value)
 271 {
 272     int rv = 1;
 273     EC_KEY *ecdh;
 274     int nid;
 275
 276     nid = EC_curve_nist2nid(value);
 277     if (nid == NID_undef)
 278         nid = OBJ_sn2nid(value);
 279     if (nid == 0)
 280         return 0;
 281     ecdh = EC_KEY_new_by_curve_name(nid);
 282     if (!ecdh)
 283         return 0;
 284     if (cctx->ctx)
 285         rv = SSL_CTX_set_tmp_ecdh(cctx->ctx, ecdh);
 286     else if (cctx->ssl)
 287         rv = SSL_set_tmp_ecdh(cctx->ssl, ecdh);
 288     EC_KEY_free(ecdh);
 289
 290     return rv > 0;
 291 }
 292 #endif
 293 static int cmd_CipherString(SSL_CONF_CTX *cctx, const char *value)
 294 {
 295     int rv = 1;
 296     if (cctx->ctx)
 297         rv = SSL_CTX_set_cipher_list(cctx->ctx, value);
 298     if (cctx->ssl)
 299         rv = SSL_set_cipher_list(cctx->ssl, value);
 300     return rv > 0;
 301 }
 302
 303 static int cmd_Protocol(SSL_CONF_CTX *cctx, const char *value)
 304 {
 305     static const ssl_flag_tbl ssl_protocol_list[] = {
 306         SSL_FLAG_TBL_INV("ALL", SSL_OP_NO_SSL_MASK),
 307         SSL_FLAG_TBL_INV("SSLv2", SSL_OP_NO_SSLv2),
 308         SSL_FLAG_TBL_INV("SSLv3", SSL_OP_NO_SSLv3),
 309         SSL_FLAG_TBL_INV("TLSv1", SSL_OP_NO_TLSv1),
 310         SSL_FLAG_TBL_INV("TLSv1.1", SSL_OP_NO_TLSv1_1),
 311         SSL_FLAG_TBL_INV("TLSv1.2", SSL_OP_NO_TLSv1_2),
 312         SSL_FLAG_TBL_INV("DTLSv1", SSL_OP_NO_DTLSv1),
 313         SSL_FLAG_TBL_INV("DTLSv1.2", SSL_OP_NO_DTLSv1_2)
 314     };
 315     cctx->tbl = ssl_protocol_list;
 316     cctx->ntbl = OSSL_NELEM(ssl_protocol_list);
 317     return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
 318 }
 319
 320 /*
 321  * protocol_from_string - converts a protocol version string to a number
 322  *
 323  * Returns -1 on failure or the version on success
 324  */
 325 static int protocol_from_string(const char *value)
 326 {
 327     struct protocol_versions {
 328         const char *name;
 329         int version;
 330     };
 331     static const struct protocol_versions versions[] = {
 332         {"None", 0},
 333         {"SSLv3", SSL3_VERSION},
 334         {"TLSv1", TLS1_VERSION},
 335         {"TLSv1.1", TLS1_1_VERSION},
 336         {"TLSv1.2", TLS1_2_VERSION},
 337         {"DTLSv1", DTLS1_VERSION},
 338         {"DTLSv1.2", DTLS1_2_VERSION}};
 339     size_t i;
 340     size_t n = OSSL_NELEM(versions);
 341
 342     for (i = 0; i < n; i++)
 343         if (strcmp(versions[i].name, value) == 0)
 344             return versions[i].version;
 345     return -1;
 346 }
 347
 348 static int min_max_proto(SSL_CONF_CTX *cctx, const char *value, int *bound)
 349 {
 350     int method_version;
 351     int new_version;
 352
 353     if (cctx->ctx != NULL)
 354         method_version = cctx->ctx->method->version;
 355     else if (cctx->ssl != NULL)
 356         method_version = cctx->ssl->ctx->method->version;
 357     else
 358         return 0;
 359     if ((new_version = protocol_from_string(value)) < 0)
 360         return 0;
 361     return ssl_set_version_bound(method_version, new_version, bound);
 362 }
 363
 364 /*
 365  * cmd_MinProtocol - Set min protocol version
 366  * @cctx: config structure to save settings in
 367  * @value: The min protocol version in string form
 368  *
 369  * Returns 1 on success and 0 on failure.
 370  */
 371 static int cmd_MinProtocol(SSL_CONF_CTX *cctx, const char *value)
 372 {
 373     return min_max_proto(cctx, value, cctx->min_version);
 374 }
 375
 376 /*
 377  * cmd_MaxProtocol - Set max protocol version
 378  * @cctx: config structure to save settings in
 379  * @value: The max protocol version in string form
 380  *
 381  * Returns 1 on success and 0 on failure.
 382  */
 383 static int cmd_MaxProtocol(SSL_CONF_CTX *cctx, const char *value)
 384 {
 385     return min_max_proto(cctx, value, cctx->max_version);
 386 }
 387
 388 static int cmd_Options(SSL_CONF_CTX *cctx, const char *value)
 389 {
 390     static const ssl_flag_tbl ssl_option_list[] = {
 391         SSL_FLAG_TBL_INV("SessionTicket", SSL_OP_NO_TICKET),
 392         SSL_FLAG_TBL_INV("EmptyFragments",
 393                          SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS),
 394         SSL_FLAG_TBL("Bugs", SSL_OP_ALL),
 395         SSL_FLAG_TBL_INV("Compression", SSL_OP_NO_COMPRESSION),
 396         SSL_FLAG_TBL_SRV("ServerPreference", SSL_OP_CIPHER_SERVER_PREFERENCE),
 397         SSL_FLAG_TBL_SRV("NoResumptionOnRenegotiation",
 398                          SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION),
 399         SSL_FLAG_TBL_SRV("DHSingle", SSL_OP_SINGLE_DH_USE),
 400         SSL_FLAG_TBL_SRV("ECDHSingle", SSL_OP_SINGLE_ECDH_USE),
 401         SSL_FLAG_TBL("UnsafeLegacyRenegotiation",
 402                      SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION),
 403     };
 404     if (value == NULL)
 405         return -3;
 406     cctx->tbl = ssl_option_list;
 407     cctx->ntbl = OSSL_NELEM(ssl_option_list);
 408     return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
 409 }
 410
 411 static int cmd_VerifyMode(SSL_CONF_CTX *cctx, const char *value)
 412 {
 413     static const ssl_flag_tbl ssl_vfy_list[] = {
 414         SSL_FLAG_VFY_CLI("Peer", SSL_VERIFY_PEER),
 415         SSL_FLAG_VFY_SRV("Request", SSL_VERIFY_PEER),
 416         SSL_FLAG_VFY_SRV("Require",
 417                          SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT),
 418         SSL_FLAG_VFY_SRV("Once", SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE)
 419     };
 420     if (value == NULL)
 421         return -3;
 422     cctx->tbl = ssl_vfy_list;
 423     cctx->ntbl = OSSL_NELEM(ssl_vfy_list);
 424     return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
 425 }
 426
 427 static int cmd_Certificate(SSL_CONF_CTX *cctx, const char *value)
 428 {
 429     int rv = 1;
 430     CERT *c = NULL;
 431     if (cctx->ctx) {
 432         rv = SSL_CTX_use_certificate_chain_file(cctx->ctx, value);
 433         c = cctx->ctx->cert;
 434     }
 435     if (cctx->ssl) {
 436         rv = SSL_use_certificate_chain_file(cctx->ssl, value);
 437         c = cctx->ssl->cert;
 438     }
 439     if (rv > 0 && c && cctx->flags & SSL_CONF_FLAG_REQUIRE_PRIVATE) {
 440         char **pfilename = &cctx->cert_filename[c->key - c->pkeys];
 441         OPENSSL_free(*pfilename);
 442         *pfilename = OPENSSL_strdup(value);
 443         if (!*pfilename)
 444             rv = 0;
 445     }
 446
 447     return rv > 0;
 448 }
 449
 450 static int cmd_PrivateKey(SSL_CONF_CTX *cctx, const char *value)
 451 {
 452     int rv = 1;
 453     if (!(cctx->flags & SSL_CONF_FLAG_CERTIFICATE))
 454         return -2;
 455     if (cctx->ctx)
 456         rv = SSL_CTX_use_PrivateKey_file(cctx->ctx, value, SSL_FILETYPE_PEM);
 457     if (cctx->ssl)
 458         rv = SSL_use_PrivateKey_file(cctx->ssl, value, SSL_FILETYPE_PEM);
 459     return rv > 0;
 460 }
 461
 462 static int cmd_ServerInfoFile(SSL_CONF_CTX *cctx, const char *value)
 463 {
 464     int rv = 1;
 465     if (cctx->ctx)
 466         rv = SSL_CTX_use_serverinfo_file(cctx->ctx, value);
 467     return rv > 0;
 468 }
 469
 470 static int do_store(SSL_CONF_CTX *cctx,
 471                     const char *CAfile, const char *CApath, int verify_store)
 472 {
 473     CERT *cert;
 474     X509_STORE **st;
 475     if (cctx->ctx)
 476         cert = cctx->ctx->cert;
 477     else if (cctx->ssl)
 478         cert = cctx->ssl->cert;
 479     else
 480         return 1;
 481     st = verify_store ? &cert->verify_store : &cert->chain_store;
 482     if (*st == NULL) {
 483         *st = X509_STORE_new();
 484         if (*st == NULL)
 485             return 0;
 486     }
 487     return X509_STORE_load_locations(*st, CAfile, CApath) > 0;
 488 }
 489
 490 static int cmd_ChainCAPath(SSL_CONF_CTX *cctx, const char *value)
 491 {
 492     return do_store(cctx, NULL, value, 0);
 493 }
 494
 495 static int cmd_ChainCAFile(SSL_CONF_CTX *cctx, const char *value)
 496 {
 497     return do_store(cctx, value, NULL, 0);
 498 }
 499
 500 static int cmd_VerifyCAPath(SSL_CONF_CTX *cctx, const char *value)
 501 {
 502     return do_store(cctx, NULL, value, 1);
 503 }
 504
 505 static int cmd_VerifyCAFile(SSL_CONF_CTX *cctx, const char *value)
 506 {
 507     return do_store(cctx, value, NULL, 1);
 508 }
 509
 510 static int cmd_ClientCAFile(SSL_CONF_CTX *cctx, const char *value)
 511 {
 512     if (cctx->canames == NULL)
 513         cctx->canames = sk_X509_NAME_new_null();
 514     if (cctx->canames == NULL)
 515         return 0;
 516     return SSL_add_file_cert_subjects_to_stack(cctx->canames, value);
 517 }
 518
 519 static int cmd_ClientCAPath(SSL_CONF_CTX *cctx, const char *value)
 520 {
 521     if (cctx->canames == NULL)
 522         cctx->canames = sk_X509_NAME_new_null();
 523     if (cctx->canames == NULL)
 524         return 0;
 525     return SSL_add_dir_cert_subjects_to_stack(cctx->canames, value);
 526 }
 527
 528 #ifndef OPENSSL_NO_DH
 529 static int cmd_DHParameters(SSL_CONF_CTX *cctx, const char *value)
 530 {
 531     int rv = 0;
 532     DH *dh = NULL;
 533     BIO *in = NULL;
 534     if (cctx->ctx || cctx->ssl) {
 535         in = BIO_new(BIO_s_file());
 536         if (in == NULL)
 537             goto end;
 538         if (BIO_read_filename(in, value) <= 0)
 539             goto end;
 540         dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL);
 541         if (dh == NULL)
 542             goto end;
 543     } else
 544         return 1;
 545     if (cctx->ctx)
 546         rv = SSL_CTX_set_tmp_dh(cctx->ctx, dh);
 547     if (cctx->ssl)
 548         rv = SSL_set_tmp_dh(cctx->ssl, dh);
 549  end:
 550     DH_free(dh);
 551     BIO_free(in);
 552     return rv > 0;
 553 }
 554 #endif
 555 typedef struct {
 556     int (*cmd) (SSL_CONF_CTX *cctx, const char *value);
 557     const char *str_file;
 558     const char *str_cmdline;
 559     unsigned short flags;
 560     unsigned short value_type;
 561 } ssl_conf_cmd_tbl;
 562
 563 /* Table of supported parameters */
 564
 565 #define SSL_CONF_CMD(name, cmdopt, flags, type) \
 566         {cmd_##name, #name, cmdopt, flags, type}
 567
 568 #define SSL_CONF_CMD_STRING(name, cmdopt, flags) \
 569         SSL_CONF_CMD(name, cmdopt, flags, SSL_CONF_TYPE_STRING)
 570
 571 #define SSL_CONF_CMD_SWITCH(name, flags) \
 572         {0, NULL, name, flags, SSL_CONF_TYPE_NONE}
 573
 574 /* See apps/apps.h if you change this table. */
 575 static const ssl_conf_cmd_tbl ssl_conf_cmds[] = {
 576     SSL_CONF_CMD_SWITCH("no_ssl3", 0),
 577     SSL_CONF_CMD_SWITCH("no_tls1", 0),
 578     SSL_CONF_CMD_SWITCH("no_tls1_1", 0),
 579     SSL_CONF_CMD_SWITCH("no_tls1_2", 0),
 580     SSL_CONF_CMD_SWITCH("bugs", 0),
 581     SSL_CONF_CMD_SWITCH("no_comp", 0),
 582     SSL_CONF_CMD_SWITCH("comp", 0),
 583     SSL_CONF_CMD_SWITCH("ecdh_single", SSL_CONF_FLAG_SERVER),
 584     SSL_CONF_CMD_SWITCH("no_ticket", 0),
 585     SSL_CONF_CMD_SWITCH("serverpref", SSL_CONF_FLAG_SERVER),
 586     SSL_CONF_CMD_SWITCH("legacy_renegotiation", 0),
 587     SSL_CONF_CMD_SWITCH("legacy_server_connect", SSL_CONF_FLAG_SERVER),
 588     SSL_CONF_CMD_SWITCH("no_resumption_on_reneg", SSL_CONF_FLAG_SERVER),
 589     SSL_CONF_CMD_SWITCH("no_legacy_server_connect", SSL_CONF_FLAG_SERVER),
 590     SSL_CONF_CMD_SWITCH("strict", 0),
 591     SSL_CONF_CMD_STRING(SignatureAlgorithms, "sigalgs", 0),
 592     SSL_CONF_CMD_STRING(ClientSignatureAlgorithms, "client_sigalgs", 0),
 593     SSL_CONF_CMD_STRING(Curves, "curves", 0),
 594 #ifndef OPENSSL_NO_EC
 595     SSL_CONF_CMD_STRING(ECDHParameters, "named_curve", SSL_CONF_FLAG_SERVER),
 596 #endif
 597     SSL_CONF_CMD_STRING(CipherString, "cipher", 0),
 598     SSL_CONF_CMD_STRING(Protocol, NULL, 0),
 599     SSL_CONF_CMD_STRING(MinProtocol, "min_protocol", SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CLIENT),
 600     SSL_CONF_CMD_STRING(MaxProtocol, "max_protocol", SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CLIENT),
 601     SSL_CONF_CMD_STRING(Options, NULL, 0),
 602     SSL_CONF_CMD_STRING(VerifyMode, NULL, 0),
 603     SSL_CONF_CMD(Certificate, "cert", SSL_CONF_FLAG_CERTIFICATE,
 604                  SSL_CONF_TYPE_FILE),
 605     SSL_CONF_CMD(PrivateKey, "key", SSL_CONF_FLAG_CERTIFICATE,
 606                  SSL_CONF_TYPE_FILE),
 607     SSL_CONF_CMD(ServerInfoFile, NULL,
 608                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 609                  SSL_CONF_TYPE_FILE),
 610     SSL_CONF_CMD(ChainCAPath, "chainCApath", SSL_CONF_FLAG_CERTIFICATE,
 611                  SSL_CONF_TYPE_DIR),
 612     SSL_CONF_CMD(ChainCAFile, "chainCAfile", SSL_CONF_FLAG_CERTIFICATE,
 613                  SSL_CONF_TYPE_FILE),
 614     SSL_CONF_CMD(VerifyCAPath, "verifyCApath", SSL_CONF_FLAG_CERTIFICATE,
 615                  SSL_CONF_TYPE_DIR),
 616     SSL_CONF_CMD(VerifyCAFile, "verifyCAfile", SSL_CONF_FLAG_CERTIFICATE,
 617                  SSL_CONF_TYPE_FILE),
 618     SSL_CONF_CMD(ClientCAFile, NULL,
 619                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 620                  SSL_CONF_TYPE_FILE),
 621     SSL_CONF_CMD(ClientCAPath, NULL,
 622                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 623                  SSL_CONF_TYPE_DIR),
 624 #ifndef OPENSSL_NO_DH
 625     SSL_CONF_CMD(DHParameters, "dhparam",
 626                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 627                  SSL_CONF_TYPE_FILE)
 628 #endif
 629 };
 630
 631 /* Supported switches: must match order of switches in ssl_conf_cmds */
 632 static const ssl_switch_tbl ssl_cmd_switches[] = {
 633     {SSL_OP_NO_SSLv3, 0},       /* no_ssl3 */
 634     {SSL_OP_NO_TLSv1, 0},       /* no_tls1 */
 635     {SSL_OP_NO_TLSv1_1, 0},     /* no_tls1_1 */
 636     {SSL_OP_NO_TLSv1_2, 0},     /* no_tls1_2 */
 637     {SSL_OP_ALL, 0},            /* bugs */
 638     {SSL_OP_NO_COMPRESSION, 0}, /* no_comp */
 639     {SSL_OP_NO_COMPRESSION, SSL_TFLAG_INV}, /* comp */
 640     {SSL_OP_SINGLE_ECDH_USE, 0}, /* ecdh_single */
 641     {SSL_OP_NO_TICKET, 0},      /* no_ticket */
 642     {SSL_OP_CIPHER_SERVER_PREFERENCE, 0}, /* serverpref */
 643     /* legacy_renegotiation */
 644     {SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION, 0},
 645     /* legacy_server_connect */
 646     {SSL_OP_LEGACY_SERVER_CONNECT, 0},
 647     /* no_resumption_on_reneg */
 648     {SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION, 0},
 649     /* no_legacy_server_connect */
 650     {SSL_OP_LEGACY_SERVER_CONNECT, SSL_TFLAG_INV},
 651     {SSL_CERT_FLAG_TLS_STRICT, SSL_TFLAG_CERT}, /* strict */
 652 };
 653
 654 static int ssl_conf_cmd_skip_prefix(SSL_CONF_CTX *cctx, const char **pcmd)
 655 {
 656     if (!pcmd || !*pcmd)
 657         return 0;
 658     /* If a prefix is set, check and skip */
 659     if (cctx->prefix) {
 660         if (strlen(*pcmd) <= cctx->prefixlen)
 661             return 0;
 662         if (cctx->flags & SSL_CONF_FLAG_CMDLINE &&
 663             strncmp(*pcmd, cctx->prefix, cctx->prefixlen))
 664             return 0;
 665         if (cctx->flags & SSL_CONF_FLAG_FILE &&
 666             strncasecmp(*pcmd, cctx->prefix, cctx->prefixlen))
 667             return 0;
 668         *pcmd += cctx->prefixlen;
 669     } else if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
 670         if (**pcmd != '-' || !(*pcmd)[1])
 671             return 0;
 672         *pcmd += 1;
 673     }
 674     return 1;
 675 }
 676
 677 /* Determine if a command is allowed according to cctx flags */
 678 static int ssl_conf_cmd_allowed(SSL_CONF_CTX *cctx,
 679                                 const ssl_conf_cmd_tbl * t)
 680 {
 681     unsigned int tfl = t->flags;
 682     unsigned int cfl = cctx->flags;
 683     if ((tfl & SSL_CONF_FLAG_SERVER) && !(cfl & SSL_CONF_FLAG_SERVER))
 684         return 0;
 685     if ((tfl & SSL_CONF_FLAG_CLIENT) && !(cfl & SSL_CONF_FLAG_CLIENT))
 686         return 0;
 687     if ((tfl & SSL_CONF_FLAG_CERTIFICATE)
 688         && !(cfl & SSL_CONF_FLAG_CERTIFICATE))
 689         return 0;
 690     return 1;
 691 }
 692
 693 static const ssl_conf_cmd_tbl *ssl_conf_cmd_lookup(SSL_CONF_CTX *cctx,
 694                                                    const char *cmd)
 695 {
 696     const ssl_conf_cmd_tbl *t;
 697     size_t i;
 698     if (cmd == NULL)
 699         return NULL;
 700
 701     /* Look for matching parameter name in table */
 702     for (i = 0, t = ssl_conf_cmds; i < OSSL_NELEM(ssl_conf_cmds); i++, t++) {
 703         if (ssl_conf_cmd_allowed(cctx, t)) {
 704             if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
 705                 if (t->str_cmdline && strcmp(t->str_cmdline, cmd) == 0)
 706                     return t;
 707             }
 708             if (cctx->flags & SSL_CONF_FLAG_FILE) {
 709                 if (t->str_file && strcasecmp(t->str_file, cmd) == 0)
 710                     return t;
 711             }
 712         }
 713     }
 714     return NULL;
 715 }
 716
 717 static int ctrl_switch_option(SSL_CONF_CTX *cctx,
 718                               const ssl_conf_cmd_tbl * cmd)
 719 {
 720     /* Find index of command in table */
 721     size_t idx = cmd - ssl_conf_cmds;
 722     const ssl_switch_tbl *scmd;
 723     /* Sanity check index */
 724     if (idx >= OSSL_NELEM(ssl_cmd_switches))
 725         return 0;
 726     /* Obtain switches entry with same index */
 727     scmd = ssl_cmd_switches + idx;
 728     ssl_set_option(cctx, scmd->name_flags, scmd->option_value, 1);
 729     return 1;
 730 }
 731
 732 int SSL_CONF_cmd(SSL_CONF_CTX *cctx, const char *cmd, const char *value)
 733 {
 734     const ssl_conf_cmd_tbl *runcmd;
 735     if (cmd == NULL) {
 736         SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_INVALID_NULL_CMD_NAME);
 737         return 0;
 738     }
 739
 740     if (!ssl_conf_cmd_skip_prefix(cctx, &cmd))
 741         return -2;
 742
 743     runcmd = ssl_conf_cmd_lookup(cctx, cmd);
 744
 745     if (runcmd) {
 746         int rv;
 747         if (runcmd->value_type == SSL_CONF_TYPE_NONE) {
 748             return ctrl_switch_option(cctx, runcmd);
 749         }
 750         if (value == NULL)
 751             return -3;
 752         rv = runcmd->cmd(cctx, value);
 753         if (rv > 0)
 754             return 2;
 755         if (rv == -2)
 756             return -2;
 757         if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS) {
 758             SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_BAD_VALUE);
 759             ERR_add_error_data(4, "cmd=", cmd, ", value=", value);
 760         }
 761         return 0;
 762     }
 763
 764     if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS) {
 765         SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_UNKNOWN_CMD_NAME);
 766         ERR_add_error_data(2, "cmd=", cmd);
 767     }
 768
 769     return -2;
 770 }
 771
 772 int SSL_CONF_cmd_argv(SSL_CONF_CTX *cctx, int *pargc, char ***pargv)
 773 {
 774     int rv;
 775     const char *arg = NULL, *argn;
 776     if (pargc && *pargc == 0)
 777         return 0;
 778     if (!pargc || *pargc > 0)
 779         arg = **pargv;
 780     if (arg == NULL)
 781         return 0;
 782     if (!pargc || *pargc > 1)
 783         argn = (*pargv)[1];
 784     else
 785         argn = NULL;
 786     cctx->flags &= ~SSL_CONF_FLAG_FILE;
 787     cctx->flags |= SSL_CONF_FLAG_CMDLINE;
 788     rv = SSL_CONF_cmd(cctx, arg, argn);
 789     if (rv > 0) {
 790         /* Success: update pargc, pargv */
 791         (*pargv) += rv;
 792         if (pargc)
 793             (*pargc) -= rv;
 794         return rv;
 795     }
 796     /* Unknown switch: indicate no arguments processed */
 797     if (rv == -2)
 798         return 0;
 799     /* Some error occurred processing command, return fatal error */
 800     if (rv == 0)
 801         return -1;
 802     return rv;
 803 }
 804
 805 int SSL_CONF_cmd_value_type(SSL_CONF_CTX *cctx, const char *cmd)
 806 {
 807     if (ssl_conf_cmd_skip_prefix(cctx, &cmd)) {
 808         const ssl_conf_cmd_tbl *runcmd;
 809         runcmd = ssl_conf_cmd_lookup(cctx, cmd);
 810         if (runcmd)
 811             return runcmd->value_type;
 812     }
 813     return SSL_CONF_TYPE_UNKNOWN;
 814 }
 815
 816 SSL_CONF_CTX *SSL_CONF_CTX_new(void)
 817 {
 818     SSL_CONF_CTX *ret = OPENSSL_zalloc(sizeof(*ret));
 819
 820     return ret;
 821 }
 822
 823 int SSL_CONF_CTX_finish(SSL_CONF_CTX *cctx)
 824 {
 825     /* See if any certificates are missing private keys */
 826     size_t i;
 827     CERT *c = NULL;
 828     if (cctx->ctx)
 829         c = cctx->ctx->cert;
 830     else if (cctx->ssl)
 831         c = cctx->ssl->cert;
 832     if (c && cctx->flags & SSL_CONF_FLAG_REQUIRE_PRIVATE) {
 833         for (i = 0; i < SSL_PKEY_NUM; i++) {
 834             const char *p = cctx->cert_filename[i];
 835             /*
 836              * If missing private key try to load one from certificate file
 837              */
 838             if (p && !c->pkeys[i].privatekey) {
 839                 if (!cmd_PrivateKey(cctx, p))
 840                     return 0;
 841             }
 842         }
 843     }
 844     if (cctx->canames) {
 845         if (cctx->ssl)
 846             SSL_set_client_CA_list(cctx->ssl, cctx->canames);
 847         else if (cctx->ctx)
 848             SSL_CTX_set_client_CA_list(cctx->ctx, cctx->canames);
 849         else
 850             sk_X509_NAME_pop_free(cctx->canames, X509_NAME_free);
 851         cctx->canames = NULL;
 852     }
 853     return 1;
 854 }
 855
 856 void SSL_CONF_CTX_free(SSL_CONF_CTX *cctx)
 857 {
 858     if (cctx) {
 859         size_t i;
 860         for (i = 0; i < SSL_PKEY_NUM; i++)
 861             OPENSSL_free(cctx->cert_filename[i]);
 862         OPENSSL_free(cctx->prefix);
 863         sk_X509_NAME_pop_free(cctx->canames, X509_NAME_free);
 864         OPENSSL_free(cctx);
 865     }
 866 }
 867
 868 unsigned int SSL_CONF_CTX_set_flags(SSL_CONF_CTX *cctx, unsigned int flags)
 869 {
 870     cctx->flags |= flags;
 871     return cctx->flags;
 872 }
 873
 874 unsigned int SSL_CONF_CTX_clear_flags(SSL_CONF_CTX *cctx, unsigned int flags)
 875 {
 876     cctx->flags &= ~flags;
 877     return cctx->flags;
 878 }
 879
 880 int SSL_CONF_CTX_set1_prefix(SSL_CONF_CTX *cctx, const char *pre)
 881 {
 882     char *tmp = NULL;
 883     if (pre) {
 884         tmp = OPENSSL_strdup(pre);
 885         if (tmp == NULL)
 886             return 0;
 887     }
 888     OPENSSL_free(cctx->prefix);
 889     cctx->prefix = tmp;
 890     if (tmp)
 891         cctx->prefixlen = strlen(tmp);
 892     else
 893         cctx->prefixlen = 0;
 894     return 1;
 895 }
 896
 897 void SSL_CONF_CTX_set_ssl(SSL_CONF_CTX *cctx, SSL *ssl)
 898 {
 899     cctx->ssl = ssl;
 900     cctx->ctx = NULL;
 901     if (ssl) {
 902         cctx->poptions = &ssl->options;
 903         cctx->min_version = &ssl->min_proto_version;
 904         cctx->max_version = &ssl->max_proto_version;
 905         cctx->pcert_flags = &ssl->cert->cert_flags;
 906         cctx->pvfy_flags = &ssl->verify_mode;
 907     } else {
 908         cctx->poptions = NULL;
 909         cctx->min_version = NULL;
 910         cctx->max_version = NULL;
 911         cctx->pcert_flags = NULL;
 912         cctx->pvfy_flags = NULL;
 913     }
 914 }
 915
 916 void SSL_CONF_CTX_set_ssl_ctx(SSL_CONF_CTX *cctx, SSL_CTX *ctx)
 917 {
 918     cctx->ctx = ctx;
 919     cctx->ssl = NULL;
 920     if (ctx) {
 921         cctx->poptions = &ctx->options;
 922         cctx->min_version = &ctx->min_proto_version;
 923         cctx->max_version = &ctx->max_proto_version;
 924         cctx->pcert_flags = &ctx->cert->cert_flags;
 925         cctx->pvfy_flags = &ctx->verify_mode;
 926     } else {
 927         cctx->poptions = NULL;
 928         cctx->min_version = NULL;
 929         cctx->max_version = NULL;
 930         cctx->pcert_flags = NULL;
 931         cctx->pvfy_flags = NULL;
 932     }
 933 }