ssl/ssl_conf.c

   1 /*
   2  * ! \file ssl/ssl_conf.c \brief SSL configuration functions
   3  */
   4 /* ====================================================================
   5  * Copyright (c) 2012 The OpenSSL Project.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  *
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in
  16  *    the documentation and/or other materials provided with the
  17  *    distribution.
  18  *
  19  * 3. All advertising materials mentioning features or use of this
  20  *    software must display the following acknowledgment:
  21  *    "This product includes software developed by the OpenSSL Project
  22  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  23  *
  24  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  25  *    endorse or promote products derived from this software without
  26  *    prior written permission. For written permission, please contact
  27  *    openssl-core@openssl.org.
  28  *
  29  * 5. Products derived from this software may not be called "OpenSSL"
  30  *    nor may "OpenSSL" appear in their names without prior written
  31  *    permission of the OpenSSL Project.
  32  *
  33  * 6. Redistributions of any form whatsoever must retain the following
  34  *    acknowledgment:
  35  *    "This product includes software developed by the OpenSSL Project
  36  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  37  *
  38  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  39  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  40  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  41  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  42  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  43  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  44  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  45  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  46  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  47  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  48  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  49  * OF THE POSSIBILITY OF SUCH DAMAGE.
  50  * ====================================================================
  51  *
  52  * This product includes cryptographic software written by Eric Young
  53  * (eay@cryptsoft.com).  This product includes software written by Tim
  54  * Hudson (tjh@cryptsoft.com).
  55  *
  56  */
  57
  58 #ifdef REF_CHECK
  59 # include <assert.h>
  60 #endif
  61 #include <stdio.h>
  62 #include "ssl_locl.h"
  63 #include <openssl/conf.h>
  64 #include <openssl/objects.h>
  65 #ifndef OPENSSL_NO_DH
  66 # include <openssl/dh.h>
  67 #endif
  68
  69 /*
  70  * structure holding name tables. This is used for pemitted elements in lists
  71  * such as TLSv1.
  72  */
  73
  74 typedef struct {
  75     const char *name;
  76     int namelen;
  77     unsigned int name_flags;
  78     unsigned long option_value;
  79 } ssl_flag_tbl;
  80
  81 /* Switch table: use for single command line switches like no_tls2 */
  82 typedef struct {
  83     unsigned long option_value;
  84     unsigned int name_flags;
  85 } ssl_switch_tbl;
  86
  87 /* Sense of name is inverted e.g. "TLSv1" will clear SSL_OP_NO_TLSv1 */
  88 #define SSL_TFLAG_INV   0x1
  89 /* Mask for type of flag referred to */
  90 #define SSL_TFLAG_TYPE_MASK 0xf00
  91 /* Flag is for options */
  92 #define SSL_TFLAG_OPTION    0x000
  93 /* Flag is for cert_flags */
  94 #define SSL_TFLAG_CERT      0x100
  95 /* Flag is for verify mode */
  96 #define SSL_TFLAG_VFY       0x200
  97 /* Option can only be used for clients */
  98 #define SSL_TFLAG_CLIENT SSL_CONF_FLAG_CLIENT
  99 /* Option can only be used for servers */
 100 #define SSL_TFLAG_SERVER SSL_CONF_FLAG_SERVER
 101 #define SSL_TFLAG_BOTH (SSL_TFLAG_CLIENT|SSL_TFLAG_SERVER)
 102
 103 #define SSL_FLAG_TBL(str, flag) \
 104         {str, (int)(sizeof(str) - 1), SSL_TFLAG_BOTH, flag}
 105 #define SSL_FLAG_TBL_SRV(str, flag) \
 106         {str, (int)(sizeof(str) - 1), SSL_TFLAG_SERVER, flag}
 107 #define SSL_FLAG_TBL_CLI(str, flag) \
 108         {str, (int)(sizeof(str) - 1), SSL_TFLAG_CLIENT, flag}
 109 #define SSL_FLAG_TBL_INV(str, flag) \
 110         {str, (int)(sizeof(str) - 1), SSL_TFLAG_INV|SSL_TFLAG_BOTH, flag}
 111 #define SSL_FLAG_TBL_SRV_INV(str, flag) \
 112         {str, (int)(sizeof(str) - 1), SSL_TFLAG_INV|SSL_TFLAG_SERVER, flag}
 113 #define SSL_FLAG_TBL_CERT(str, flag) \
 114         {str, (int)(sizeof(str) - 1), SSL_TFLAG_CERT|SSL_TFLAG_BOTH, flag}
 115
 116 #define SSL_FLAG_VFY_CLI(str, flag) \
 117         {str, (int)(sizeof(str) - 1), SSL_TFLAG_VFY | SSL_TFLAG_CLIENT, flag}
 118 #define SSL_FLAG_VFY_SRV(str, flag) \
 119         {str, (int)(sizeof(str) - 1), SSL_TFLAG_VFY | SSL_TFLAG_SERVER, flag}
 120
 121 /*
 122  * Opaque structure containing SSL configuration context.
 123  */
 124
 125 struct ssl_conf_ctx_st {
 126     /*
 127      * Various flags indicating (among other things) which options we will
 128      * recognise.
 129      */
 130     unsigned int flags;
 131     /* Prefix and length of commands */
 132     char *prefix;
 133     size_t prefixlen;
 134     /* SSL_CTX or SSL structure to perform operations on */
 135     SSL_CTX *ctx;
 136     SSL *ssl;
 137     /* Pointer to SSL or SSL_CTX options field or NULL if none */
 138     uint32_t *poptions;
 139     /* Certificate filenames for each type */
 140     char *cert_filename[SSL_PKEY_NUM];
 141     /* Pointer to SSL or SSL_CTX cert_flags or NULL if none */
 142     uint32_t *pcert_flags;
 143     /* Pointer to SSL or SSL_CTX verify_mode or NULL if none */
 144     uint32_t *pvfy_flags;
 145     /* Current flag table being worked on */
 146     const ssl_flag_tbl *tbl;
 147     /* Size of table */
 148     size_t ntbl;
 149     /* Client CA names */
 150     STACK_OF(X509_NAME) *canames;
 151 };
 152
 153 static void ssl_set_option(SSL_CONF_CTX *cctx, unsigned int name_flags,
 154                            unsigned long option_value, int onoff)
 155 {
 156     uint32_t *pflags;
 157     if (cctx->poptions == NULL)
 158         return;
 159     if (name_flags & SSL_TFLAG_INV)
 160         onoff ^= 1;
 161     switch (name_flags & SSL_TFLAG_TYPE_MASK) {
 162
 163     case SSL_TFLAG_CERT:
 164         pflags = cctx->pcert_flags;
 165         break;
 166
 167     case SSL_TFLAG_VFY:
 168         pflags =  cctx->pvfy_flags;
 169         break;
 170
 171     case SSL_TFLAG_OPTION:
 172         pflags = cctx->poptions;
 173         break;
 174
 175     default:
 176         return;
 177
 178     }
 179     if (onoff)
 180         *pflags |= option_value;
 181     else
 182         *pflags &= ~option_value;
 183 }
 184
 185 static int ssl_match_option(SSL_CONF_CTX *cctx, const ssl_flag_tbl *tbl,
 186                             const char *name, int namelen, int onoff)
 187 {
 188     /* If name not relevant for context skip */
 189     if (!(cctx->flags & tbl->name_flags & SSL_TFLAG_BOTH))
 190         return 0;
 191     if (namelen == -1) {
 192         if (strcmp(tbl->name, name))
 193             return 0;
 194     } else if (tbl->namelen != namelen
 195                || strncasecmp(tbl->name, name, namelen))
 196         return 0;
 197     ssl_set_option(cctx, tbl->name_flags, tbl->option_value, onoff);
 198     return 1;
 199 }
 200
 201 static int ssl_set_option_list(const char *elem, int len, void *usr)
 202 {
 203     SSL_CONF_CTX *cctx = usr;
 204     size_t i;
 205     const ssl_flag_tbl *tbl;
 206     int onoff = 1;
 207     /*
 208      * len == -1 indicates not being called in list context, just for single
 209      * command line switches, so don't allow +, -.
 210      */
 211     if (elem == NULL)
 212         return 0;
 213     if (len != -1) {
 214         if (*elem == '+') {
 215             elem++;
 216             len--;
 217             onoff = 1;
 218         } else if (*elem == '-') {
 219             elem++;
 220             len--;
 221             onoff = 0;
 222         }
 223     }
 224     for (i = 0, tbl = cctx->tbl; i < cctx->ntbl; i++, tbl++) {
 225         if (ssl_match_option(cctx, tbl, elem, len, onoff))
 226             return 1;
 227     }
 228     return 0;
 229 }
 230
 231 /* Set supported signature algorithms */
 232 static int cmd_SignatureAlgorithms(SSL_CONF_CTX *cctx, const char *value)
 233 {
 234     int rv;
 235     if (cctx->ssl)
 236         rv = SSL_set1_sigalgs_list(cctx->ssl, value);
 237     /* NB: ctx == NULL performs syntax checking only */
 238     else
 239         rv = SSL_CTX_set1_sigalgs_list(cctx->ctx, value);
 240     return rv > 0;
 241 }
 242
 243 /* Set supported client signature algorithms */
 244 static int cmd_ClientSignatureAlgorithms(SSL_CONF_CTX *cctx,
 245                                          const char *value)
 246 {
 247     int rv;
 248     if (cctx->ssl)
 249         rv = SSL_set1_client_sigalgs_list(cctx->ssl, value);
 250     /* NB: ctx == NULL performs syntax checking only */
 251     else
 252         rv = SSL_CTX_set1_client_sigalgs_list(cctx->ctx, value);
 253     return rv > 0;
 254 }
 255
 256 static int cmd_Curves(SSL_CONF_CTX *cctx, const char *value)
 257 {
 258     int rv;
 259     if (cctx->ssl)
 260         rv = SSL_set1_curves_list(cctx->ssl, value);
 261     /* NB: ctx == NULL performs syntax checking only */
 262     else
 263         rv = SSL_CTX_set1_curves_list(cctx->ctx, value);
 264     return rv > 0;
 265 }
 266
 267 #ifndef OPENSSL_NO_EC
 268 /* ECDH temporary parameters */
 269 static int cmd_ECDHParameters(SSL_CONF_CTX *cctx, const char *value)
 270 {
 271     int rv = 1;
 272     EC_KEY *ecdh;
 273     int nid;
 274
 275     nid = EC_curve_nist2nid(value);
 276     if (nid == NID_undef)
 277         nid = OBJ_sn2nid(value);
 278     if (nid == 0)
 279         return 0;
 280     ecdh = EC_KEY_new_by_curve_name(nid);
 281     if (!ecdh)
 282         return 0;
 283     if (cctx->ctx)
 284         rv = SSL_CTX_set_tmp_ecdh(cctx->ctx, ecdh);
 285     else if (cctx->ssl)
 286         rv = SSL_set_tmp_ecdh(cctx->ssl, ecdh);
 287     EC_KEY_free(ecdh);
 288
 289     return rv > 0;
 290 }
 291 #endif
 292 static int cmd_CipherString(SSL_CONF_CTX *cctx, const char *value)
 293 {
 294     int rv = 1;
 295     if (cctx->ctx)
 296         rv = SSL_CTX_set_cipher_list(cctx->ctx, value);
 297     if (cctx->ssl)
 298         rv = SSL_set_cipher_list(cctx->ssl, value);
 299     return rv > 0;
 300 }
 301
 302 static int cmd_Protocol(SSL_CONF_CTX *cctx, const char *value)
 303 {
 304     static const ssl_flag_tbl ssl_protocol_list[] = {
 305         SSL_FLAG_TBL_INV("ALL", SSL_OP_NO_SSL_MASK),
 306         SSL_FLAG_TBL_INV("SSLv2", SSL_OP_NO_SSLv2),
 307         SSL_FLAG_TBL_INV("SSLv3", SSL_OP_NO_SSLv3),
 308         SSL_FLAG_TBL_INV("TLSv1", SSL_OP_NO_TLSv1),
 309         SSL_FLAG_TBL_INV("TLSv1.1", SSL_OP_NO_TLSv1_1),
 310         SSL_FLAG_TBL_INV("TLSv1.2", SSL_OP_NO_TLSv1_2)
 311     };
 312     cctx->tbl = ssl_protocol_list;
 313     cctx->ntbl = OSSL_NELEM(ssl_protocol_list);
 314     return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
 315 }
 316
 317 static int cmd_Options(SSL_CONF_CTX *cctx, const char *value)
 318 {
 319     static const ssl_flag_tbl ssl_option_list[] = {
 320         SSL_FLAG_TBL_INV("SessionTicket", SSL_OP_NO_TICKET),
 321         SSL_FLAG_TBL_INV("EmptyFragments",
 322                          SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS),
 323         SSL_FLAG_TBL("Bugs", SSL_OP_ALL),
 324         SSL_FLAG_TBL_INV("Compression", SSL_OP_NO_COMPRESSION),
 325         SSL_FLAG_TBL_SRV("ServerPreference", SSL_OP_CIPHER_SERVER_PREFERENCE),
 326         SSL_FLAG_TBL_SRV("NoResumptionOnRenegotiation",
 327                          SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION),
 328         SSL_FLAG_TBL_SRV("DHSingle", SSL_OP_SINGLE_DH_USE),
 329         SSL_FLAG_TBL_SRV("ECDHSingle", SSL_OP_SINGLE_ECDH_USE),
 330         SSL_FLAG_TBL("UnsafeLegacyRenegotiation",
 331                      SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION),
 332     };
 333     if (value == NULL)
 334         return -3;
 335     cctx->tbl = ssl_option_list;
 336     cctx->ntbl = OSSL_NELEM(ssl_option_list);
 337     return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
 338 }
 339
 340 static int cmd_VerifyMode(SSL_CONF_CTX *cctx, const char *value)
 341 {
 342     static const ssl_flag_tbl ssl_vfy_list[] = {
 343         SSL_FLAG_VFY_CLI("Peer", SSL_VERIFY_PEER),
 344         SSL_FLAG_VFY_SRV("Request", SSL_VERIFY_PEER),
 345         SSL_FLAG_VFY_SRV("Require",
 346                          SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT),
 347         SSL_FLAG_VFY_SRV("Once", SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE)
 348     };
 349     if (value == NULL)
 350         return -3;
 351     cctx->tbl = ssl_vfy_list;
 352     cctx->ntbl = OSSL_NELEM(ssl_vfy_list);
 353     return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
 354 }
 355
 356 static int cmd_Certificate(SSL_CONF_CTX *cctx, const char *value)
 357 {
 358     int rv = 1;
 359     CERT *c = NULL;
 360     if (cctx->ctx) {
 361         rv = SSL_CTX_use_certificate_chain_file(cctx->ctx, value);
 362         c = cctx->ctx->cert;
 363     }
 364     if (cctx->ssl) {
 365         rv = SSL_use_certificate_chain_file(cctx->ssl, value);
 366         c = cctx->ssl->cert;
 367     }
 368     if (rv > 0 && c && cctx->flags & SSL_CONF_FLAG_REQUIRE_PRIVATE) {
 369         char **pfilename = &cctx->cert_filename[c->key - c->pkeys];
 370         OPENSSL_free(*pfilename);
 371         *pfilename = OPENSSL_strdup(value);
 372         if (!*pfilename)
 373             rv = 0;
 374     }
 375
 376     return rv > 0;
 377 }
 378
 379 static int cmd_PrivateKey(SSL_CONF_CTX *cctx, const char *value)
 380 {
 381     int rv = 1;
 382     if (!(cctx->flags & SSL_CONF_FLAG_CERTIFICATE))
 383         return -2;
 384     if (cctx->ctx)
 385         rv = SSL_CTX_use_PrivateKey_file(cctx->ctx, value, SSL_FILETYPE_PEM);
 386     if (cctx->ssl)
 387         rv = SSL_use_PrivateKey_file(cctx->ssl, value, SSL_FILETYPE_PEM);
 388     return rv > 0;
 389 }
 390
 391 static int cmd_ServerInfoFile(SSL_CONF_CTX *cctx, const char *value)
 392 {
 393     int rv = 1;
 394     if (cctx->ctx)
 395         rv = SSL_CTX_use_serverinfo_file(cctx->ctx, value);
 396     return rv > 0;
 397 }
 398
 399 static int do_store(SSL_CONF_CTX *cctx,
 400                     const char *CAfile, const char *CApath, int verify_store)
 401 {
 402     CERT *cert;
 403     X509_STORE **st;
 404     if (cctx->ctx)
 405         cert = cctx->ctx->cert;
 406     else if (cctx->ssl)
 407         cert = cctx->ssl->cert;
 408     else
 409         return 1;
 410     st = verify_store ? &cert->verify_store : &cert->chain_store;
 411     if (*st == NULL) {
 412         *st = X509_STORE_new();
 413         if (*st == NULL)
 414             return 0;
 415     }
 416     return X509_STORE_load_locations(*st, CAfile, CApath) > 0;
 417 }
 418
 419 static int cmd_ChainCAPath(SSL_CONF_CTX *cctx, const char *value)
 420 {
 421     return do_store(cctx, NULL, value, 0);
 422 }
 423
 424 static int cmd_ChainCAFile(SSL_CONF_CTX *cctx, const char *value)
 425 {
 426     return do_store(cctx, value, NULL, 0);
 427 }
 428
 429 static int cmd_VerifyCAPath(SSL_CONF_CTX *cctx, const char *value)
 430 {
 431     return do_store(cctx, NULL, value, 1);
 432 }
 433
 434 static int cmd_VerifyCAFile(SSL_CONF_CTX *cctx, const char *value)
 435 {
 436     return do_store(cctx, value, NULL, 1);
 437 }
 438
 439 static int cmd_ClientCAFile(SSL_CONF_CTX *cctx, const char *value)
 440 {
 441     if (cctx->canames == NULL)
 442         cctx->canames = sk_X509_NAME_new_null();
 443     if (cctx->canames == NULL)
 444         return 0;
 445     return SSL_add_file_cert_subjects_to_stack(cctx->canames, value);
 446 }
 447
 448 static int cmd_ClientCAPath(SSL_CONF_CTX *cctx, const char *value)
 449 {
 450     if (cctx->canames == NULL)
 451         cctx->canames = sk_X509_NAME_new_null();
 452     if (cctx->canames == NULL)
 453         return 0;
 454     return SSL_add_dir_cert_subjects_to_stack(cctx->canames, value);
 455 }
 456
 457 #ifndef OPENSSL_NO_DH
 458 static int cmd_DHParameters(SSL_CONF_CTX *cctx, const char *value)
 459 {
 460     int rv = 0;
 461     DH *dh = NULL;
 462     BIO *in = NULL;
 463     if (cctx->ctx || cctx->ssl) {
 464         in = BIO_new(BIO_s_file());
 465         if (in == NULL)
 466             goto end;
 467         if (BIO_read_filename(in, value) <= 0)
 468             goto end;
 469         dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL);
 470         if (dh == NULL)
 471             goto end;
 472     } else
 473         return 1;
 474     if (cctx->ctx)
 475         rv = SSL_CTX_set_tmp_dh(cctx->ctx, dh);
 476     if (cctx->ssl)
 477         rv = SSL_set_tmp_dh(cctx->ssl, dh);
 478  end:
 479     DH_free(dh);
 480     BIO_free(in);
 481     return rv > 0;
 482 }
 483 #endif
 484 typedef struct {
 485     int (*cmd) (SSL_CONF_CTX *cctx, const char *value);
 486     const char *str_file;
 487     const char *str_cmdline;
 488     unsigned short flags;
 489     unsigned short value_type;
 490 } ssl_conf_cmd_tbl;
 491
 492 /* Table of supported parameters */
 493
 494 #define SSL_CONF_CMD(name, cmdopt, flags, type) \
 495         {cmd_##name, #name, cmdopt, flags, type}
 496
 497 #define SSL_CONF_CMD_STRING(name, cmdopt, flags) \
 498         SSL_CONF_CMD(name, cmdopt, flags, SSL_CONF_TYPE_STRING)
 499
 500 #define SSL_CONF_CMD_SWITCH(name, flags) \
 501         {0, NULL, name, flags, SSL_CONF_TYPE_NONE}
 502
 503 /* See apps/apps.h if you change this table. */
 504 static const ssl_conf_cmd_tbl ssl_conf_cmds[] = {
 505     SSL_CONF_CMD_SWITCH("no_ssl3", 0),
 506     SSL_CONF_CMD_SWITCH("no_tls1", 0),
 507     SSL_CONF_CMD_SWITCH("no_tls1_1", 0),
 508     SSL_CONF_CMD_SWITCH("no_tls1_2", 0),
 509     SSL_CONF_CMD_SWITCH("bugs", 0),
 510     SSL_CONF_CMD_SWITCH("no_comp", 0),
 511     SSL_CONF_CMD_SWITCH("ecdh_single", SSL_CONF_FLAG_SERVER),
 512     SSL_CONF_CMD_SWITCH("no_ticket", 0),
 513     SSL_CONF_CMD_SWITCH("serverpref", SSL_CONF_FLAG_SERVER),
 514     SSL_CONF_CMD_SWITCH("legacy_renegotiation", 0),
 515     SSL_CONF_CMD_SWITCH("legacy_server_connect", SSL_CONF_FLAG_SERVER),
 516     SSL_CONF_CMD_SWITCH("no_resumption_on_reneg", SSL_CONF_FLAG_SERVER),
 517     SSL_CONF_CMD_SWITCH("no_legacy_server_connect", SSL_CONF_FLAG_SERVER),
 518     SSL_CONF_CMD_SWITCH("strict", 0),
 519 #ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
 520     SSL_CONF_CMD_SWITCH("debug_broken_protocol", 0),
 521 #endif
 522     SSL_CONF_CMD_STRING(SignatureAlgorithms, "sigalgs", 0),
 523     SSL_CONF_CMD_STRING(ClientSignatureAlgorithms, "client_sigalgs", 0),
 524     SSL_CONF_CMD_STRING(Curves, "curves", 0),
 525 #ifndef OPENSSL_NO_EC
 526     SSL_CONF_CMD_STRING(ECDHParameters, "named_curve", SSL_CONF_FLAG_SERVER),
 527 #endif
 528     SSL_CONF_CMD_STRING(CipherString, "cipher", 0),
 529     SSL_CONF_CMD_STRING(Protocol, NULL, 0),
 530     SSL_CONF_CMD_STRING(Options, NULL, 0),
 531     SSL_CONF_CMD_STRING(VerifyMode, NULL, 0),
 532     SSL_CONF_CMD(Certificate, "cert", SSL_CONF_FLAG_CERTIFICATE,
 533                  SSL_CONF_TYPE_FILE),
 534     SSL_CONF_CMD(PrivateKey, "key", SSL_CONF_FLAG_CERTIFICATE,
 535                  SSL_CONF_TYPE_FILE),
 536     SSL_CONF_CMD(ServerInfoFile, NULL,
 537                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 538                  SSL_CONF_TYPE_FILE),
 539     SSL_CONF_CMD(ChainCAPath, "chainCApath", SSL_CONF_FLAG_CERTIFICATE,
 540                  SSL_CONF_TYPE_DIR),
 541     SSL_CONF_CMD(ChainCAFile, "chainCAfile", SSL_CONF_FLAG_CERTIFICATE,
 542                  SSL_CONF_TYPE_FILE),
 543     SSL_CONF_CMD(VerifyCAPath, "verifyCApath", SSL_CONF_FLAG_CERTIFICATE,
 544                  SSL_CONF_TYPE_DIR),
 545     SSL_CONF_CMD(VerifyCAFile, "verifyCAfile", SSL_CONF_FLAG_CERTIFICATE,
 546                  SSL_CONF_TYPE_FILE),
 547     SSL_CONF_CMD(ClientCAFile, NULL,
 548                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 549                  SSL_CONF_TYPE_FILE),
 550     SSL_CONF_CMD(ClientCAPath, NULL,
 551                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 552                  SSL_CONF_TYPE_DIR),
 553 #ifndef OPENSSL_NO_DH
 554     SSL_CONF_CMD(DHParameters, "dhparam",
 555                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 556                  SSL_CONF_TYPE_FILE)
 557 #endif
 558 };
 559
 560 /* Supported switches: must match order of switches in ssl_conf_cmds */
 561 static const ssl_switch_tbl ssl_cmd_switches[] = {
 562     {SSL_OP_NO_SSLv3, 0},       /* no_ssl3 */
 563     {SSL_OP_NO_TLSv1, 0},       /* no_tls1 */
 564     {SSL_OP_NO_TLSv1_1, 0},     /* no_tls1_1 */
 565     {SSL_OP_NO_TLSv1_2, 0},     /* no_tls1_2 */
 566     {SSL_OP_ALL, 0},            /* bugs */
 567     {SSL_OP_NO_COMPRESSION, 0}, /* no_comp */
 568     {SSL_OP_SINGLE_ECDH_USE, 0}, /* ecdh_single */
 569     {SSL_OP_NO_TICKET, 0},      /* no_ticket */
 570     {SSL_OP_CIPHER_SERVER_PREFERENCE, 0}, /* serverpref */
 571     /* legacy_renegotiation */
 572     {SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION, 0},
 573     /* legacy_server_connect */
 574     {SSL_OP_LEGACY_SERVER_CONNECT, 0},
 575     /* no_resumption_on_reneg */
 576     {SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION, 0},
 577     /* no_legacy_server_connect */
 578     {SSL_OP_LEGACY_SERVER_CONNECT, SSL_TFLAG_INV},
 579     {SSL_CERT_FLAG_TLS_STRICT, SSL_TFLAG_CERT}, /* strict */
 580 #ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
 581     {SSL_CERT_FLAG_BROKEN_PROTOCOL, SSL_TFLAG_CERT} /* debug_broken_protocol */
 582 #endif
 583 };
 584
 585 static int ssl_conf_cmd_skip_prefix(SSL_CONF_CTX *cctx, const char **pcmd)
 586 {
 587     if (!pcmd || !*pcmd)
 588         return 0;
 589     /* If a prefix is set, check and skip */
 590     if (cctx->prefix) {
 591         if (strlen(*pcmd) <= cctx->prefixlen)
 592             return 0;
 593         if (cctx->flags & SSL_CONF_FLAG_CMDLINE &&
 594             strncmp(*pcmd, cctx->prefix, cctx->prefixlen))
 595             return 0;
 596         if (cctx->flags & SSL_CONF_FLAG_FILE &&
 597             strncasecmp(*pcmd, cctx->prefix, cctx->prefixlen))
 598             return 0;
 599         *pcmd += cctx->prefixlen;
 600     } else if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
 601         if (**pcmd != '-' || !(*pcmd)[1])
 602             return 0;
 603         *pcmd += 1;
 604     }
 605     return 1;
 606 }
 607
 608 /* Determine if a command is allowed according to cctx flags */
 609 static int ssl_conf_cmd_allowed(SSL_CONF_CTX *cctx,
 610                                 const ssl_conf_cmd_tbl * t)
 611 {
 612     unsigned int tfl = t->flags;
 613     unsigned int cfl = cctx->flags;
 614     if ((tfl & SSL_CONF_FLAG_SERVER) && !(cfl & SSL_CONF_FLAG_SERVER))
 615         return 0;
 616     if ((tfl & SSL_CONF_FLAG_CLIENT) && !(cfl & SSL_CONF_FLAG_CLIENT))
 617         return 0;
 618     if ((tfl & SSL_CONF_FLAG_CERTIFICATE)
 619         && !(cfl & SSL_CONF_FLAG_CERTIFICATE))
 620         return 0;
 621     return 1;
 622 }
 623
 624 static const ssl_conf_cmd_tbl *ssl_conf_cmd_lookup(SSL_CONF_CTX *cctx,
 625                                                    const char *cmd)
 626 {
 627     const ssl_conf_cmd_tbl *t;
 628     size_t i;
 629     if (cmd == NULL)
 630         return NULL;
 631
 632     /* Look for matching parameter name in table */
 633     for (i = 0, t = ssl_conf_cmds; i < OSSL_NELEM(ssl_conf_cmds); i++, t++) {
 634         if (ssl_conf_cmd_allowed(cctx, t)) {
 635             if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
 636                 if (t->str_cmdline && strcmp(t->str_cmdline, cmd) == 0)
 637                     return t;
 638             }
 639             if (cctx->flags & SSL_CONF_FLAG_FILE) {
 640                 if (t->str_file && strcasecmp(t->str_file, cmd) == 0)
 641                     return t;
 642             }
 643         }
 644     }
 645     return NULL;
 646 }
 647
 648 static int ctrl_switch_option(SSL_CONF_CTX *cctx,
 649                               const ssl_conf_cmd_tbl * cmd)
 650 {
 651     /* Find index of command in table */
 652     size_t idx = cmd - ssl_conf_cmds;
 653     const ssl_switch_tbl *scmd;
 654     /* Sanity check index */
 655     if (idx >= OSSL_NELEM(ssl_cmd_switches))
 656         return 0;
 657     /* Obtain switches entry with same index */
 658     scmd = ssl_cmd_switches + idx;
 659     ssl_set_option(cctx, scmd->name_flags, scmd->option_value, 1);
 660     return 1;
 661 }
 662
 663 int SSL_CONF_cmd(SSL_CONF_CTX *cctx, const char *cmd, const char *value)
 664 {
 665     const ssl_conf_cmd_tbl *runcmd;
 666     if (cmd == NULL) {
 667         SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_INVALID_NULL_CMD_NAME);
 668         return 0;
 669     }
 670
 671     if (!ssl_conf_cmd_skip_prefix(cctx, &cmd))
 672         return -2;
 673
 674     runcmd = ssl_conf_cmd_lookup(cctx, cmd);
 675
 676     if (runcmd) {
 677         int rv;
 678         if (runcmd->value_type == SSL_CONF_TYPE_NONE) {
 679             return ctrl_switch_option(cctx, runcmd);
 680         }
 681         if (value == NULL)
 682             return -3;
 683         rv = runcmd->cmd(cctx, value);
 684         if (rv > 0)
 685             return 2;
 686         if (rv == -2)
 687             return -2;
 688         if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS) {
 689             SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_BAD_VALUE);
 690             ERR_add_error_data(4, "cmd=", cmd, ", value=", value);
 691         }
 692         return 0;
 693     }
 694
 695     if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS) {
 696         SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_UNKNOWN_CMD_NAME);
 697         ERR_add_error_data(2, "cmd=", cmd);
 698     }
 699
 700     return -2;
 701 }
 702
 703 int SSL_CONF_cmd_argv(SSL_CONF_CTX *cctx, int *pargc, char ***pargv)
 704 {
 705     int rv;
 706     const char *arg = NULL, *argn;
 707     if (pargc && *pargc == 0)
 708         return 0;
 709     if (!pargc || *pargc > 0)
 710         arg = **pargv;
 711     if (arg == NULL)
 712         return 0;
 713     if (!pargc || *pargc > 1)
 714         argn = (*pargv)[1];
 715     else
 716         argn = NULL;
 717     cctx->flags &= ~SSL_CONF_FLAG_FILE;
 718     cctx->flags |= SSL_CONF_FLAG_CMDLINE;
 719     rv = SSL_CONF_cmd(cctx, arg, argn);
 720     if (rv > 0) {
 721         /* Success: update pargc, pargv */
 722         (*pargv) += rv;
 723         if (pargc)
 724             (*pargc) -= rv;
 725         return rv;
 726     }
 727     /* Unknown switch: indicate no arguments processed */
 728     if (rv == -2)
 729         return 0;
 730     /* Some error occurred processing command, return fatal error */
 731     if (rv == 0)
 732         return -1;
 733     return rv;
 734 }
 735
 736 int SSL_CONF_cmd_value_type(SSL_CONF_CTX *cctx, const char *cmd)
 737 {
 738     if (ssl_conf_cmd_skip_prefix(cctx, &cmd)) {
 739         const ssl_conf_cmd_tbl *runcmd;
 740         runcmd = ssl_conf_cmd_lookup(cctx, cmd);
 741         if (runcmd)
 742             return runcmd->value_type;
 743     }
 744     return SSL_CONF_TYPE_UNKNOWN;
 745 }
 746
 747 SSL_CONF_CTX *SSL_CONF_CTX_new(void)
 748 {
 749     SSL_CONF_CTX *ret = OPENSSL_zalloc(sizeof(*ret));
 750
 751     return ret;
 752 }
 753
 754 int SSL_CONF_CTX_finish(SSL_CONF_CTX *cctx)
 755 {
 756     /* See if any certificates are missing private keys */
 757     size_t i;
 758     CERT *c = NULL;
 759     if (cctx->ctx)
 760         c = cctx->ctx->cert;
 761     else if (cctx->ssl)
 762         c = cctx->ssl->cert;
 763     if (c && cctx->flags & SSL_CONF_FLAG_REQUIRE_PRIVATE) {
 764         for (i = 0; i < SSL_PKEY_NUM; i++) {
 765             const char *p = cctx->cert_filename[i];
 766             /*
 767              * If missing private key try to load one from certificate file
 768              */
 769             if (p && !c->pkeys[i].privatekey) {
 770                 if (!cmd_PrivateKey(cctx, p))
 771                     return 0;
 772             }
 773         }
 774     }
 775     if (cctx->canames) {
 776         if (cctx->ssl)
 777             SSL_set_client_CA_list(cctx->ssl, cctx->canames);
 778         else if (cctx->ctx)
 779             SSL_CTX_set_client_CA_list(cctx->ctx, cctx->canames);
 780         else
 781             sk_X509_NAME_pop_free(cctx->canames, X509_NAME_free);
 782         cctx->canames = NULL;
 783     }
 784     return 1;
 785 }
 786
 787 void SSL_CONF_CTX_free(SSL_CONF_CTX *cctx)
 788 {
 789     if (cctx) {
 790         size_t i;
 791         for (i = 0; i < SSL_PKEY_NUM; i++)
 792             OPENSSL_free(cctx->cert_filename[i]);
 793         OPENSSL_free(cctx->prefix);
 794         sk_X509_NAME_pop_free(cctx->canames, X509_NAME_free);
 795         OPENSSL_free(cctx);
 796     }
 797 }
 798
 799 unsigned int SSL_CONF_CTX_set_flags(SSL_CONF_CTX *cctx, unsigned int flags)
 800 {
 801     cctx->flags |= flags;
 802     return cctx->flags;
 803 }
 804
 805 unsigned int SSL_CONF_CTX_clear_flags(SSL_CONF_CTX *cctx, unsigned int flags)
 806 {
 807     cctx->flags &= ~flags;
 808     return cctx->flags;
 809 }
 810
 811 int SSL_CONF_CTX_set1_prefix(SSL_CONF_CTX *cctx, const char *pre)
 812 {
 813     char *tmp = NULL;
 814     if (pre) {
 815         tmp = OPENSSL_strdup(pre);
 816         if (tmp == NULL)
 817             return 0;
 818     }
 819     OPENSSL_free(cctx->prefix);
 820     cctx->prefix = tmp;
 821     if (tmp)
 822         cctx->prefixlen = strlen(tmp);
 823     else
 824         cctx->prefixlen = 0;
 825     return 1;
 826 }
 827
 828 void SSL_CONF_CTX_set_ssl(SSL_CONF_CTX *cctx, SSL *ssl)
 829 {
 830     cctx->ssl = ssl;
 831     cctx->ctx = NULL;
 832     if (ssl) {
 833         cctx->poptions = &ssl->options;
 834         cctx->pcert_flags = &ssl->cert->cert_flags;
 835         cctx->pvfy_flags = &ssl->verify_mode;
 836     } else {
 837         cctx->poptions = NULL;
 838         cctx->pcert_flags = NULL;
 839         cctx->pvfy_flags = NULL;
 840     }
 841 }
 842
 843 void SSL_CONF_CTX_set_ssl_ctx(SSL_CONF_CTX *cctx, SSL_CTX *ctx)
 844 {
 845     cctx->ctx = ctx;
 846     cctx->ssl = NULL;
 847     if (ctx) {
 848         cctx->poptions = &ctx->options;
 849         cctx->pcert_flags = &ctx->cert->cert_flags;
 850         cctx->pvfy_flags = &ctx->verify_mode;
 851     } else {
 852         cctx->poptions = NULL;
 853         cctx->pcert_flags = NULL;
 854         cctx->pvfy_flags = NULL;
 855     }
 856 }