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 /* Flags refers to cert_flags not options */
  90 #define SSL_TFLAG_CERT  0x2
  91 /* Option can only be used for clients */
  92 #define SSL_TFLAG_CLIENT SSL_CONF_FLAG_CLIENT
  93 /* Option can only be used for servers */
  94 #define SSL_TFLAG_SERVER SSL_CONF_FLAG_SERVER
  95 #define SSL_TFLAG_BOTH (SSL_TFLAG_CLIENT|SSL_TFLAG_SERVER)
  96
  97 #define SSL_FLAG_TBL(str, flag) \
  98         {str, (int)(sizeof(str) - 1), SSL_TFLAG_BOTH, flag}
  99 #define SSL_FLAG_TBL_SRV(str, flag) \
 100         {str, (int)(sizeof(str) - 1), SSL_TFLAG_SERVER, flag}
 101 #define SSL_FLAG_TBL_CLI(str, flag) \
 102         {str, (int)(sizeof(str) - 1), SSL_TFLAG_CLIENT, flag}
 103 #define SSL_FLAG_TBL_INV(str, flag) \
 104         {str, (int)(sizeof(str) - 1), SSL_TFLAG_INV|SSL_TFLAG_BOTH, flag}
 105 #define SSL_FLAG_TBL_SRV_INV(str, flag) \
 106         {str, (int)(sizeof(str) - 1), SSL_TFLAG_INV|SSL_TFLAG_SERVER, flag}
 107 #define SSL_FLAG_TBL_CERT(str, flag) \
 108         {str, (int)(sizeof(str) - 1), SSL_TFLAG_CERT|SSL_TFLAG_BOTH, flag}
 109
 110 /*
 111  * Opaque structure containing SSL configuration context.
 112  */
 113
 114 struct ssl_conf_ctx_st {
 115     /*
 116      * Various flags indicating (among other things) which options we will
 117      * recognise.
 118      */
 119     unsigned int flags;
 120     /* Prefix and length of commands */
 121     char *prefix;
 122     size_t prefixlen;
 123     /* SSL_CTX or SSL structure to perform operations on */
 124     SSL_CTX *ctx;
 125     SSL *ssl;
 126     /* Pointer to SSL or SSL_CTX options field or NULL if none */
 127     unsigned long *poptions;
 128     /* Certificate filenames for each type */
 129     char *cert_filename[SSL_PKEY_NUM];
 130     /* Pointer to SSL or SSL_CTX cert_flags or NULL if none */
 131     unsigned int *pcert_flags;
 132     /* Current flag table being worked on */
 133     const ssl_flag_tbl *tbl;
 134     /* Size of table */
 135     size_t ntbl;
 136 };
 137
 138 static void ssl_set_option(SSL_CONF_CTX *cctx, unsigned int name_flags,
 139                            unsigned long option_value, int onoff)
 140 {
 141     if (cctx->poptions == NULL)
 142         return;
 143     if (name_flags & SSL_TFLAG_INV)
 144         onoff ^= 1;
 145     if (name_flags & SSL_TFLAG_CERT) {
 146         if (onoff)
 147             *cctx->pcert_flags |= option_value;
 148         else
 149             *cctx->pcert_flags &= ~option_value;
 150     } else {
 151         if (onoff)
 152             *cctx->poptions |= option_value;
 153         else
 154             *cctx->poptions &= ~option_value;
 155     }
 156 }
 157
 158 static int ssl_match_option(SSL_CONF_CTX *cctx, const ssl_flag_tbl *tbl,
 159                             const char *name, int namelen, int onoff)
 160 {
 161     /* If name not relevant for context skip */
 162     if (!(cctx->flags & tbl->name_flags & SSL_TFLAG_BOTH))
 163         return 0;
 164     if (namelen == -1) {
 165         if (strcmp(tbl->name, name))
 166             return 0;
 167     } else if (tbl->namelen != namelen
 168                || strncasecmp(tbl->name, name, namelen))
 169         return 0;
 170     ssl_set_option(cctx, tbl->name_flags, tbl->option_value, onoff);
 171     return 1;
 172 }
 173
 174 static int ssl_set_option_list(const char *elem, int len, void *usr)
 175 {
 176     SSL_CONF_CTX *cctx = usr;
 177     size_t i;
 178     const ssl_flag_tbl *tbl;
 179     int onoff = 1;
 180     /*
 181      * len == -1 indicates not being called in list context, just for single
 182      * command line switches, so don't allow +, -.
 183      */
 184     if (elem == NULL)
 185         return 0;
 186     if (len != -1) {
 187         if (*elem == '+') {
 188             elem++;
 189             len--;
 190             onoff = 1;
 191         } else if (*elem == '-') {
 192             elem++;
 193             len--;
 194             onoff = 0;
 195         }
 196     }
 197     for (i = 0, tbl = cctx->tbl; i < cctx->ntbl; i++, tbl++) {
 198         if (ssl_match_option(cctx, tbl, elem, len, onoff))
 199             return 1;
 200     }
 201     return 0;
 202 }
 203
 204 /* Set supported signature algorithms */
 205 static int cmd_SignatureAlgorithms(SSL_CONF_CTX *cctx, const char *value)
 206 {
 207     int rv;
 208     if (cctx->ssl)
 209         rv = SSL_set1_sigalgs_list(cctx->ssl, value);
 210     /* NB: ctx == NULL performs syntax checking only */
 211     else
 212         rv = SSL_CTX_set1_sigalgs_list(cctx->ctx, value);
 213     return rv > 0;
 214 }
 215
 216 /* Set supported client signature algorithms */
 217 static int cmd_ClientSignatureAlgorithms(SSL_CONF_CTX *cctx,
 218                                          const char *value)
 219 {
 220     int rv;
 221     if (cctx->ssl)
 222         rv = SSL_set1_client_sigalgs_list(cctx->ssl, value);
 223     /* NB: ctx == NULL performs syntax checking only */
 224     else
 225         rv = SSL_CTX_set1_client_sigalgs_list(cctx->ctx, value);
 226     return rv > 0;
 227 }
 228
 229 static int cmd_Curves(SSL_CONF_CTX *cctx, const char *value)
 230 {
 231     int rv;
 232     if (cctx->ssl)
 233         rv = SSL_set1_curves_list(cctx->ssl, value);
 234     /* NB: ctx == NULL performs syntax checking only */
 235     else
 236         rv = SSL_CTX_set1_curves_list(cctx->ctx, value);
 237     return rv > 0;
 238 }
 239
 240 #ifndef OPENSSL_NO_EC
 241 /* ECDH temporary parameters */
 242 static int cmd_ECDHParameters(SSL_CONF_CTX *cctx, const char *value)
 243 {
 244     int onoff = -1, rv = 1;
 245     if (cctx->flags & SSL_CONF_FLAG_FILE) {
 246         if (*value == '+') {
 247             onoff = 1;
 248             value++;
 249         }
 250         if (*value == '-') {
 251             onoff = 0;
 252             value++;
 253         }
 254         if (strcasecmp(value, "automatic") == 0) {
 255             if (onoff == -1)
 256                 onoff = 1;
 257         } else if (onoff != -1)
 258             return 0;
 259     } else if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
 260         if (strcmp(value, "auto") == 0)
 261             onoff = 1;
 262     }
 263
 264     if (onoff != -1) {
 265         if (cctx->ctx)
 266             rv = SSL_CTX_set_ecdh_auto(cctx->ctx, onoff);
 267         else if (cctx->ssl)
 268             rv = SSL_set_ecdh_auto(cctx->ssl, onoff);
 269     } else {
 270         EC_KEY *ecdh;
 271         int nid;
 272         nid = EC_curve_nist2nid(value);
 273         if (nid == NID_undef)
 274             nid = OBJ_sn2nid(value);
 275         if (nid == 0)
 276             return 0;
 277         ecdh = EC_KEY_new_by_curve_name(nid);
 278         if (!ecdh)
 279             return 0;
 280         if (cctx->ctx)
 281             rv = SSL_CTX_set_tmp_ecdh(cctx->ctx, ecdh);
 282         else if (cctx->ssl)
 283             rv = SSL_set_tmp_ecdh(cctx->ssl, ecdh);
 284         EC_KEY_free(ecdh);
 285     }
 286
 287     return rv > 0;
 288 }
 289 #endif
 290 static int cmd_CipherString(SSL_CONF_CTX *cctx, const char *value)
 291 {
 292     int rv = 1;
 293     if (cctx->ctx)
 294         rv = SSL_CTX_set_cipher_list(cctx->ctx, value);
 295     if (cctx->ssl)
 296         rv = SSL_set_cipher_list(cctx->ssl, value);
 297     return rv > 0;
 298 }
 299
 300 static int cmd_Protocol(SSL_CONF_CTX *cctx, const char *value)
 301 {
 302     static const ssl_flag_tbl ssl_protocol_list[] = {
 303         SSL_FLAG_TBL_INV("ALL", SSL_OP_NO_SSL_MASK),
 304         SSL_FLAG_TBL_INV("SSLv2", SSL_OP_NO_SSLv2),
 305         SSL_FLAG_TBL_INV("SSLv3", SSL_OP_NO_SSLv3),
 306         SSL_FLAG_TBL_INV("TLSv1", SSL_OP_NO_TLSv1),
 307         SSL_FLAG_TBL_INV("TLSv1.1", SSL_OP_NO_TLSv1_1),
 308         SSL_FLAG_TBL_INV("TLSv1.2", SSL_OP_NO_TLSv1_2)
 309     };
 310     cctx->tbl = ssl_protocol_list;
 311     cctx->ntbl = OSSL_NELEM(ssl_protocol_list);
 312     return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
 313 }
 314
 315 static int cmd_Options(SSL_CONF_CTX *cctx, const char *value)
 316 {
 317     static const ssl_flag_tbl ssl_option_list[] = {
 318         SSL_FLAG_TBL_INV("SessionTicket", SSL_OP_NO_TICKET),
 319         SSL_FLAG_TBL_INV("EmptyFragments",
 320                          SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS),
 321         SSL_FLAG_TBL("Bugs", SSL_OP_ALL),
 322         SSL_FLAG_TBL_INV("Compression", SSL_OP_NO_COMPRESSION),
 323         SSL_FLAG_TBL_SRV("ServerPreference", SSL_OP_CIPHER_SERVER_PREFERENCE),
 324         SSL_FLAG_TBL_SRV("NoResumptionOnRenegotiation",
 325                          SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION),
 326         SSL_FLAG_TBL_SRV("DHSingle", SSL_OP_SINGLE_DH_USE),
 327         SSL_FLAG_TBL_SRV("ECDHSingle", SSL_OP_SINGLE_ECDH_USE),
 328         SSL_FLAG_TBL("UnsafeLegacyRenegotiation",
 329                      SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION),
 330     };
 331     if (value == NULL)
 332         return -3;
 333     cctx->tbl = ssl_option_list;
 334     cctx->ntbl = OSSL_NELEM(ssl_option_list);
 335     return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
 336 }
 337
 338 static int cmd_Certificate(SSL_CONF_CTX *cctx, const char *value)
 339 {
 340     int rv = 1;
 341     CERT *c = NULL;
 342     if (cctx->ctx) {
 343         rv = SSL_CTX_use_certificate_chain_file(cctx->ctx, value);
 344         c = cctx->ctx->cert;
 345     }
 346     if (cctx->ssl) {
 347         rv = SSL_use_certificate_chain_file(cctx->ssl, value);
 348         c = cctx->ssl->cert;
 349     }
 350     if (rv > 0 && c && cctx->flags & SSL_CONF_FLAG_REQUIRE_PRIVATE) {
 351         char **pfilename = &cctx->cert_filename[c->key - c->pkeys];
 352         OPENSSL_free(*pfilename);
 353         *pfilename = BUF_strdup(value);
 354         if (!*pfilename)
 355             rv = 0;
 356     }
 357
 358     return rv > 0;
 359 }
 360
 361 static int cmd_PrivateKey(SSL_CONF_CTX *cctx, const char *value)
 362 {
 363     int rv = 1;
 364     if (!(cctx->flags & SSL_CONF_FLAG_CERTIFICATE))
 365         return -2;
 366     if (cctx->ctx)
 367         rv = SSL_CTX_use_PrivateKey_file(cctx->ctx, value, SSL_FILETYPE_PEM);
 368     if (cctx->ssl)
 369         rv = SSL_use_PrivateKey_file(cctx->ssl, value, SSL_FILETYPE_PEM);
 370     return rv > 0;
 371 }
 372
 373 static int cmd_ServerInfoFile(SSL_CONF_CTX *cctx, const char *value)
 374 {
 375     int rv = 1;
 376     if (cctx->ctx)
 377         rv = SSL_CTX_use_serverinfo_file(cctx->ctx, value);
 378     return rv > 0;
 379 }
 380
 381 #ifndef OPENSSL_NO_DH
 382 static int cmd_DHParameters(SSL_CONF_CTX *cctx, const char *value)
 383 {
 384     int rv = 0;
 385     DH *dh = NULL;
 386     BIO *in = NULL;
 387     if (cctx->ctx || cctx->ssl) {
 388         in = BIO_new(BIO_s_file_internal());
 389         if (!in)
 390             goto end;
 391         if (BIO_read_filename(in, value) <= 0)
 392             goto end;
 393         dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL);
 394         if (!dh)
 395             goto end;
 396     } else
 397         return 1;
 398     if (cctx->ctx)
 399         rv = SSL_CTX_set_tmp_dh(cctx->ctx, dh);
 400     if (cctx->ssl)
 401         rv = SSL_set_tmp_dh(cctx->ssl, dh);
 402  end:
 403     DH_free(dh);
 404     BIO_free(in);
 405     return rv > 0;
 406 }
 407 #endif
 408 typedef struct {
 409     int (*cmd) (SSL_CONF_CTX *cctx, const char *value);
 410     const char *str_file;
 411     const char *str_cmdline;
 412     unsigned short flags;
 413     unsigned short value_type;
 414 } ssl_conf_cmd_tbl;
 415
 416 /* Table of supported parameters */
 417
 418 #define SSL_CONF_CMD(name, cmdopt, flags, type) \
 419         {cmd_##name, #name, cmdopt, flags, type}
 420
 421 #define SSL_CONF_CMD_STRING(name, cmdopt, flags) \
 422         SSL_CONF_CMD(name, cmdopt, flags, SSL_CONF_TYPE_STRING)
 423
 424 #define SSL_CONF_CMD_SWITCH(name, flags) \
 425         {0, NULL, name, flags, SSL_CONF_TYPE_NONE}
 426
 427 /* See apps/apps.h if you change this table. */
 428 static const ssl_conf_cmd_tbl ssl_conf_cmds[] = {
 429     SSL_CONF_CMD_SWITCH("no_ssl3", 0),
 430     SSL_CONF_CMD_SWITCH("no_tls1", 0),
 431     SSL_CONF_CMD_SWITCH("no_tls1_1", 0),
 432     SSL_CONF_CMD_SWITCH("no_tls1_2", 0),
 433     SSL_CONF_CMD_SWITCH("bugs", 0),
 434     SSL_CONF_CMD_SWITCH("no_comp", 0),
 435     SSL_CONF_CMD_SWITCH("ecdh_single", SSL_CONF_FLAG_SERVER),
 436 #ifndef OPENSSL_NO_TLSEXT
 437     SSL_CONF_CMD_SWITCH("no_ticket", 0),
 438 #endif
 439     SSL_CONF_CMD_SWITCH("serverpref", SSL_CONF_FLAG_SERVER),
 440     SSL_CONF_CMD_SWITCH("legacy_renegotiation", 0),
 441     SSL_CONF_CMD_SWITCH("legacy_server_connect", SSL_CONF_FLAG_SERVER),
 442     SSL_CONF_CMD_SWITCH("no_resumption_on_reneg", SSL_CONF_FLAG_SERVER),
 443     SSL_CONF_CMD_SWITCH("no_legacy_server_connect", SSL_CONF_FLAG_SERVER),
 444     SSL_CONF_CMD_SWITCH("strict", 0),
 445 #ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
 446     SSL_CONF_CMD_SWITCH("debug_broken_protocol", 0),
 447 #endif
 448     SSL_CONF_CMD_STRING(SignatureAlgorithms, "sigalgs", 0),
 449     SSL_CONF_CMD_STRING(ClientSignatureAlgorithms, "client_sigalgs", 0),
 450     SSL_CONF_CMD_STRING(Curves, "curves", 0),
 451 #ifndef OPENSSL_NO_EC
 452     SSL_CONF_CMD_STRING(ECDHParameters, "named_curve", SSL_CONF_FLAG_SERVER),
 453 #endif
 454     SSL_CONF_CMD_STRING(CipherString, "cipher", 0),
 455     SSL_CONF_CMD_STRING(Protocol, NULL, 0),
 456     SSL_CONF_CMD_STRING(Options, NULL, 0),
 457     SSL_CONF_CMD(Certificate, "cert", SSL_CONF_FLAG_CERTIFICATE,
 458                  SSL_CONF_TYPE_FILE),
 459     SSL_CONF_CMD(PrivateKey, "key", SSL_CONF_FLAG_CERTIFICATE,
 460                  SSL_CONF_TYPE_FILE),
 461     SSL_CONF_CMD(ServerInfoFile, NULL,
 462                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 463                  SSL_CONF_TYPE_FILE),
 464 #ifndef OPENSSL_NO_DH
 465     SSL_CONF_CMD(DHParameters, "dhparam",
 466                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 467                  SSL_CONF_TYPE_FILE)
 468 #endif
 469 };
 470
 471 /* Supported switches: must match order of switches in ssl_conf_cmds */
 472 static const ssl_switch_tbl ssl_cmd_switches[] = {
 473     {SSL_OP_NO_SSLv3, 0},       /* no_ssl3 */
 474     {SSL_OP_NO_TLSv1, 0},       /* no_tls1 */
 475     {SSL_OP_NO_TLSv1_1, 0},     /* no_tls1_1 */
 476     {SSL_OP_NO_TLSv1_2, 0},     /* no_tls1_2 */
 477     {SSL_OP_ALL, 0},            /* bugs */
 478     {SSL_OP_NO_COMPRESSION, 0}, /* no_comp */
 479     {SSL_OP_SINGLE_ECDH_USE, 0}, /* ecdh_single */
 480 #ifndef OPENSSL_NO_TLSEXT
 481     {SSL_OP_NO_TICKET, 0},      /* no_ticket */
 482 #endif
 483     {SSL_OP_CIPHER_SERVER_PREFERENCE, 0}, /* serverpref */
 484     /* legacy_renegotiation */
 485     {SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION, 0},
 486     /* legacy_server_connect */
 487     {SSL_OP_LEGACY_SERVER_CONNECT, 0},
 488     /* no_resumption_on_reneg */
 489     {SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION, 0},
 490     /* no_legacy_server_connect */
 491     {SSL_OP_LEGACY_SERVER_CONNECT, SSL_TFLAG_INV},
 492     {SSL_CERT_FLAG_TLS_STRICT, SSL_TFLAG_CERT}, /* strict */
 493 #ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
 494     {SSL_CERT_FLAG_BROKEN_PROTOCOL, SSL_TFLAG_CERT} /* debug_broken_protocol */
 495 #endif
 496 };
 497
 498 static int ssl_conf_cmd_skip_prefix(SSL_CONF_CTX *cctx, const char **pcmd)
 499 {
 500     if (!pcmd || !*pcmd)
 501         return 0;
 502     /* If a prefix is set, check and skip */
 503     if (cctx->prefix) {
 504         if (strlen(*pcmd) <= cctx->prefixlen)
 505             return 0;
 506         if (cctx->flags & SSL_CONF_FLAG_CMDLINE &&
 507             strncmp(*pcmd, cctx->prefix, cctx->prefixlen))
 508             return 0;
 509         if (cctx->flags & SSL_CONF_FLAG_FILE &&
 510             strncasecmp(*pcmd, cctx->prefix, cctx->prefixlen))
 511             return 0;
 512         *pcmd += cctx->prefixlen;
 513     } else if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
 514         if (**pcmd != '-' || !(*pcmd)[1])
 515             return 0;
 516         *pcmd += 1;
 517     }
 518     return 1;
 519 }
 520
 521 /* Determine if a command is allowed according to cctx flags */
 522 static int ssl_conf_cmd_allowed(SSL_CONF_CTX *cctx,
 523                                 const ssl_conf_cmd_tbl * t)
 524 {
 525     unsigned int tfl = t->flags;
 526     unsigned int cfl = cctx->flags;
 527     if ((tfl & SSL_CONF_FLAG_SERVER) && !(cfl & SSL_CONF_FLAG_SERVER))
 528         return 0;
 529     if ((tfl & SSL_CONF_FLAG_CLIENT) && !(cfl & SSL_CONF_FLAG_CLIENT))
 530         return 0;
 531     if ((tfl & SSL_CONF_FLAG_CERTIFICATE)
 532         && !(cfl & SSL_CONF_FLAG_CERTIFICATE))
 533         return 0;
 534     return 1;
 535 }
 536
 537 static const ssl_conf_cmd_tbl *ssl_conf_cmd_lookup(SSL_CONF_CTX *cctx,
 538                                                    const char *cmd)
 539 {
 540     const ssl_conf_cmd_tbl *t;
 541     size_t i;
 542     if (cmd == NULL)
 543         return NULL;
 544
 545     /* Look for matching parameter name in table */
 546     for (i = 0, t = ssl_conf_cmds; i < OSSL_NELEM(ssl_conf_cmds); i++, t++) {
 547         if (ssl_conf_cmd_allowed(cctx, t)) {
 548             if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
 549                 if (t->str_cmdline && strcmp(t->str_cmdline, cmd) == 0)
 550                     return t;
 551             }
 552             if (cctx->flags & SSL_CONF_FLAG_FILE) {
 553                 if (t->str_file && strcasecmp(t->str_file, cmd) == 0)
 554                     return t;
 555             }
 556         }
 557     }
 558     return NULL;
 559 }
 560
 561 static int ctrl_switch_option(SSL_CONF_CTX *cctx,
 562                               const ssl_conf_cmd_tbl * cmd)
 563 {
 564     /* Find index of command in table */
 565     size_t idx = cmd - ssl_conf_cmds;
 566     const ssl_switch_tbl *scmd;
 567     /* Sanity check index */
 568     if (idx >= OSSL_NELEM(ssl_cmd_switches))
 569         return 0;
 570     /* Obtain switches entry with same index */
 571     scmd = ssl_cmd_switches + idx;
 572     ssl_set_option(cctx, scmd->name_flags, scmd->option_value, 1);
 573     return 1;
 574 }
 575
 576 int SSL_CONF_cmd(SSL_CONF_CTX *cctx, const char *cmd, const char *value)
 577 {
 578     const ssl_conf_cmd_tbl *runcmd;
 579     if (cmd == NULL) {
 580         SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_INVALID_NULL_CMD_NAME);
 581         return 0;
 582     }
 583
 584     if (!ssl_conf_cmd_skip_prefix(cctx, &cmd))
 585         return -2;
 586
 587     runcmd = ssl_conf_cmd_lookup(cctx, cmd);
 588
 589     if (runcmd) {
 590         int rv;
 591         if (runcmd->value_type == SSL_CONF_TYPE_NONE) {
 592             return ctrl_switch_option(cctx, runcmd);
 593         }
 594         if (value == NULL)
 595             return -3;
 596         rv = runcmd->cmd(cctx, value);
 597         if (rv > 0)
 598             return 2;
 599         if (rv == -2)
 600             return -2;
 601         if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS) {
 602             SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_BAD_VALUE);
 603             ERR_add_error_data(4, "cmd=", cmd, ", value=", value);
 604         }
 605         return 0;
 606     }
 607
 608     if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS) {
 609         SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_UNKNOWN_CMD_NAME);
 610         ERR_add_error_data(2, "cmd=", cmd);
 611     }
 612
 613     return -2;
 614 }
 615
 616 int SSL_CONF_cmd_argv(SSL_CONF_CTX *cctx, int *pargc, char ***pargv)
 617 {
 618     int rv;
 619     const char *arg = NULL, *argn;
 620     if (pargc && *pargc == 0)
 621         return 0;
 622     if (!pargc || *pargc > 0)
 623         arg = **pargv;
 624     if (arg == NULL)
 625         return 0;
 626     if (!pargc || *pargc > 1)
 627         argn = (*pargv)[1];
 628     else
 629         argn = NULL;
 630     cctx->flags &= ~SSL_CONF_FLAG_FILE;
 631     cctx->flags |= SSL_CONF_FLAG_CMDLINE;
 632     rv = SSL_CONF_cmd(cctx, arg, argn);
 633     if (rv > 0) {
 634         /* Success: update pargc, pargv */
 635         (*pargv) += rv;
 636         if (pargc)
 637             (*pargc) -= rv;
 638         return rv;
 639     }
 640     /* Unknown switch: indicate no arguments processed */
 641     if (rv == -2)
 642         return 0;
 643     /* Some error occurred processing command, return fatal error */
 644     if (rv == 0)
 645         return -1;
 646     return rv;
 647 }
 648
 649 int SSL_CONF_cmd_value_type(SSL_CONF_CTX *cctx, const char *cmd)
 650 {
 651     if (ssl_conf_cmd_skip_prefix(cctx, &cmd)) {
 652         const ssl_conf_cmd_tbl *runcmd;
 653         runcmd = ssl_conf_cmd_lookup(cctx, cmd);
 654         if (runcmd)
 655             return runcmd->value_type;
 656     }
 657     return SSL_CONF_TYPE_UNKNOWN;
 658 }
 659
 660 SSL_CONF_CTX *SSL_CONF_CTX_new(void)
 661 {
 662     SSL_CONF_CTX *ret = OPENSSL_malloc(sizeof(*ret));
 663     size_t i;
 664
 665     if (ret) {
 666         ret->flags = 0;
 667         ret->prefix = NULL;
 668         ret->prefixlen = 0;
 669         ret->ssl = NULL;
 670         ret->ctx = NULL;
 671         ret->poptions = NULL;
 672         ret->pcert_flags = NULL;
 673         ret->tbl = NULL;
 674         ret->ntbl = 0;
 675         for (i = 0; i < SSL_PKEY_NUM; i++)
 676             ret->cert_filename[i] = NULL;
 677     }
 678     return ret;
 679 }
 680
 681 int SSL_CONF_CTX_finish(SSL_CONF_CTX *cctx)
 682 {
 683     /* See if any certificates are missing private keys */
 684     size_t i;
 685     CERT *c = NULL;
 686     if (cctx->ctx)
 687         c = cctx->ctx->cert;
 688     else if (cctx->ssl)
 689         c = cctx->ssl->cert;
 690     if (c && cctx->flags & SSL_CONF_FLAG_REQUIRE_PRIVATE) {
 691         for (i = 0; i < SSL_PKEY_NUM; i++) {
 692             const char *p = cctx->cert_filename[i];
 693             /*
 694              * If missing private key try to load one from certificate file
 695              */
 696             if (p && !c->pkeys[i].privatekey) {
 697                 if (!cmd_PrivateKey(cctx, p))
 698                     return 0;
 699             }
 700         }
 701     }
 702     return 1;
 703 }
 704
 705 void SSL_CONF_CTX_free(SSL_CONF_CTX *cctx)
 706 {
 707     if (cctx) {
 708         size_t i;
 709         for (i = 0; i < SSL_PKEY_NUM; i++)
 710             OPENSSL_free(cctx->cert_filename[i]);
 711         OPENSSL_free(cctx->prefix);
 712         OPENSSL_free(cctx);
 713     }
 714 }
 715
 716 unsigned int SSL_CONF_CTX_set_flags(SSL_CONF_CTX *cctx, unsigned int flags)
 717 {
 718     cctx->flags |= flags;
 719     return cctx->flags;
 720 }
 721
 722 unsigned int SSL_CONF_CTX_clear_flags(SSL_CONF_CTX *cctx, unsigned int flags)
 723 {
 724     cctx->flags &= ~flags;
 725     return cctx->flags;
 726 }
 727
 728 int SSL_CONF_CTX_set1_prefix(SSL_CONF_CTX *cctx, const char *pre)
 729 {
 730     char *tmp = NULL;
 731     if (pre) {
 732         tmp = BUF_strdup(pre);
 733         if (tmp == NULL)
 734             return 0;
 735     }
 736     OPENSSL_free(cctx->prefix);
 737     cctx->prefix = tmp;
 738     if (tmp)
 739         cctx->prefixlen = strlen(tmp);
 740     else
 741         cctx->prefixlen = 0;
 742     return 1;
 743 }
 744
 745 void SSL_CONF_CTX_set_ssl(SSL_CONF_CTX *cctx, SSL *ssl)
 746 {
 747     cctx->ssl = ssl;
 748     cctx->ctx = NULL;
 749     if (ssl) {
 750         cctx->poptions = &ssl->options;
 751         cctx->pcert_flags = &ssl->cert->cert_flags;
 752     } else {
 753         cctx->poptions = NULL;
 754         cctx->pcert_flags = NULL;
 755     }
 756 }
 757
 758 void SSL_CONF_CTX_set_ssl_ctx(SSL_CONF_CTX *cctx, SSL_CTX *ctx)
 759 {
 760     cctx->ctx = ctx;
 761     cctx->ssl = NULL;
 762     if (ctx) {
 763         cctx->poptions = &ctx->options;
 764         cctx->pcert_flags = &ctx->cert->cert_flags;
 765     } else {
 766         cctx->poptions = NULL;
 767         cctx->pcert_flags = NULL;
 768     }
 769 }