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