release/src/router/openssl/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 and single command line switches such as no_tls1
  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 /* Sense of name is inverted e.g. "TLSv1" will clear SSL_OP_NO_TLSv1 */
  82 #define SSL_TFLAG_INV   0x1
  83 /* Flags refers to cert_flags not options */
  84 #define SSL_TFLAG_CERT  0x2
  85 /* Option can only be used for clients */
  86 #define SSL_TFLAG_CLIENT SSL_CONF_FLAG_CLIENT
  87 /* Option can only be used for servers */
  88 #define SSL_TFLAG_SERVER SSL_CONF_FLAG_SERVER
  89 #define SSL_TFLAG_BOTH (SSL_TFLAG_CLIENT|SSL_TFLAG_SERVER)
  90
  91 #define SSL_FLAG_TBL(str, flag) \
  92         {str, (int)(sizeof(str) - 1), SSL_TFLAG_BOTH, flag}
  93 #define SSL_FLAG_TBL_SRV(str, flag) \
  94         {str, (int)(sizeof(str) - 1), SSL_TFLAG_SERVER, flag}
  95 #define SSL_FLAG_TBL_CLI(str, flag) \
  96         {str, (int)(sizeof(str) - 1), SSL_TFLAG_CLIENT, flag}
  97 #define SSL_FLAG_TBL_INV(str, flag) \
  98         {str, (int)(sizeof(str) - 1), SSL_TFLAG_INV|SSL_TFLAG_BOTH, flag}
  99 #define SSL_FLAG_TBL_SRV_INV(str, flag) \
 100         {str, (int)(sizeof(str) - 1), SSL_TFLAG_INV|SSL_TFLAG_SERVER, flag}
 101 #define SSL_FLAG_TBL_CERT(str, flag) \
 102         {str, (int)(sizeof(str) - 1), SSL_TFLAG_CERT|SSL_TFLAG_BOTH, flag}
 103
 104 /*
 105  * Opaque structure containing SSL configuration context.
 106  */
 107
 108 struct ssl_conf_ctx_st {
 109     /*
 110      * Various flags indicating (among other things) which options we will
 111      * recognise.
 112      */
 113     unsigned int flags;
 114     /* Prefix and length of commands */
 115     char *prefix;
 116     size_t prefixlen;
 117     /* SSL_CTX or SSL structure to perform operations on */
 118     SSL_CTX *ctx;
 119     SSL *ssl;
 120     /* Pointer to SSL or SSL_CTX options field or NULL if none */
 121     unsigned long *poptions;
 122     /* Pointer to SSL or SSL_CTX cert_flags or NULL if none */
 123     unsigned int *pcert_flags;
 124     /* Current flag table being worked on */
 125     const ssl_flag_tbl *tbl;
 126     /* Size of table */
 127     size_t ntbl;
 128 };
 129
 130 static int ssl_match_option(SSL_CONF_CTX *cctx, const ssl_flag_tbl *tbl,
 131                             const char *name, int namelen, int onoff)
 132 {
 133     /* If name not relevant for context skip */
 134     if (!(cctx->flags & tbl->name_flags & SSL_TFLAG_BOTH))
 135         return 0;
 136     if (namelen == -1) {
 137         if (strcmp(tbl->name, name))
 138             return 0;
 139     } else if (tbl->namelen != namelen
 140                || strncasecmp(tbl->name, name, namelen))
 141         return 0;
 142     if (cctx->poptions) {
 143         if (tbl->name_flags & SSL_TFLAG_INV)
 144             onoff ^= 1;
 145         if (tbl->name_flags & SSL_TFLAG_CERT) {
 146             if (onoff)
 147                 *cctx->pcert_flags |= tbl->option_value;
 148             else
 149                 *cctx->pcert_flags &= ~tbl->option_value;
 150         } else {
 151             if (onoff)
 152                 *cctx->poptions |= tbl->option_value;
 153             else
 154                 *cctx->poptions &= ~tbl->option_value;
 155         }
 156     }
 157     return 1;
 158 }
 159
 160 static int ssl_set_option_list(const char *elem, int len, void *usr)
 161 {
 162     SSL_CONF_CTX *cctx = usr;
 163     size_t i;
 164     const ssl_flag_tbl *tbl;
 165     int onoff = 1;
 166     /*
 167      * len == -1 indicates not being called in list context, just for single
 168      * command line switches, so don't allow +, -.
 169      */
 170     if (elem == NULL)
 171         return 0;
 172     if (len != -1) {
 173         if (*elem == '+') {
 174             elem++;
 175             len--;
 176             onoff = 1;
 177         } else if (*elem == '-') {
 178             elem++;
 179             len--;
 180             onoff = 0;
 181         }
 182     }
 183     for (i = 0, tbl = cctx->tbl; i < cctx->ntbl; i++, tbl++) {
 184         if (ssl_match_option(cctx, tbl, elem, len, onoff))
 185             return 1;
 186     }
 187     return 0;
 188 }
 189
 190 /* Single command line switches with no argument e.g. -no_ssl3 */
 191 static int ctrl_str_option(SSL_CONF_CTX *cctx, const char *cmd)
 192 {
 193     static const ssl_flag_tbl ssl_option_single[] = {
 194         SSL_FLAG_TBL("no_ssl2", SSL_OP_NO_SSLv2),
 195         SSL_FLAG_TBL("no_ssl3", SSL_OP_NO_SSLv3),
 196         SSL_FLAG_TBL("no_tls1", SSL_OP_NO_TLSv1),
 197         SSL_FLAG_TBL("no_tls1_1", SSL_OP_NO_TLSv1_1),
 198         SSL_FLAG_TBL("no_tls1_2", SSL_OP_NO_TLSv1_2),
 199         SSL_FLAG_TBL("bugs", SSL_OP_ALL),
 200         SSL_FLAG_TBL("no_comp", SSL_OP_NO_COMPRESSION),
 201         SSL_FLAG_TBL_SRV("ecdh_single", SSL_OP_SINGLE_ECDH_USE),
 202 #ifndef OPENSSL_NO_TLSEXT
 203         SSL_FLAG_TBL("no_ticket", SSL_OP_NO_TICKET),
 204 #endif
 205         SSL_FLAG_TBL_SRV("serverpref", SSL_OP_CIPHER_SERVER_PREFERENCE),
 206         SSL_FLAG_TBL("legacy_renegotiation",
 207                      SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION),
 208         SSL_FLAG_TBL_SRV("legacy_server_connect",
 209                          SSL_OP_LEGACY_SERVER_CONNECT),
 210         SSL_FLAG_TBL_SRV("no_resumption_on_reneg",
 211                          SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION),
 212         SSL_FLAG_TBL_SRV_INV("no_legacy_server_connect",
 213                              SSL_OP_LEGACY_SERVER_CONNECT),
 214         SSL_FLAG_TBL_CERT("strict", SSL_CERT_FLAG_TLS_STRICT),
 215 #ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
 216         SSL_FLAG_TBL_CERT("debug_broken_protocol",
 217                           SSL_CERT_FLAG_BROKEN_PROTOCOL),
 218 #endif
 219     };
 220     cctx->tbl = ssl_option_single;
 221     cctx->ntbl = sizeof(ssl_option_single) / sizeof(ssl_flag_tbl);
 222     return ssl_set_option_list(cmd, -1, cctx);
 223 }
 224
 225 /* Set supported signature algorithms */
 226 static int cmd_SignatureAlgorithms(SSL_CONF_CTX *cctx, const char *value)
 227 {
 228     int rv;
 229     if (cctx->ssl)
 230         rv = SSL_set1_sigalgs_list(cctx->ssl, value);
 231     /* NB: ctx == NULL performs syntax checking only */
 232     else
 233         rv = SSL_CTX_set1_sigalgs_list(cctx->ctx, value);
 234     return rv > 0;
 235 }
 236
 237 /* Set supported client signature algorithms */
 238 static int cmd_ClientSignatureAlgorithms(SSL_CONF_CTX *cctx,
 239                                          const char *value)
 240 {
 241     int rv;
 242     if (cctx->ssl)
 243         rv = SSL_set1_client_sigalgs_list(cctx->ssl, value);
 244     /* NB: ctx == NULL performs syntax checking only */
 245     else
 246         rv = SSL_CTX_set1_client_sigalgs_list(cctx->ctx, value);
 247     return rv > 0;
 248 }
 249
 250 static int cmd_Curves(SSL_CONF_CTX *cctx, const char *value)
 251 {
 252     int rv;
 253     if (cctx->ssl)
 254         rv = SSL_set1_curves_list(cctx->ssl, value);
 255     /* NB: ctx == NULL performs syntax checking only */
 256     else
 257         rv = SSL_CTX_set1_curves_list(cctx->ctx, value);
 258     return rv > 0;
 259 }
 260
 261 #ifndef OPENSSL_NO_ECDH
 262 /* ECDH temporary parameters */
 263 static int cmd_ECDHParameters(SSL_CONF_CTX *cctx, const char *value)
 264 {
 265     int onoff = -1, rv = 1;
 266     if (!(cctx->flags & SSL_CONF_FLAG_SERVER))
 267         return -2;
 268     if (cctx->flags & SSL_CONF_FLAG_FILE) {
 269         if (*value == '+') {
 270             onoff = 1;
 271             value++;
 272         }
 273         if (*value == '-') {
 274             onoff = 0;
 275             value++;
 276         }
 277         if (!strcasecmp(value, "automatic")) {
 278             if (onoff == -1)
 279                 onoff = 1;
 280         } else if (onoff != -1)
 281             return 0;
 282     } else if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
 283         if (!strcmp(value, "auto"))
 284             onoff = 1;
 285     }
 286
 287     if (onoff != -1) {
 288         if (cctx->ctx)
 289             rv = SSL_CTX_set_ecdh_auto(cctx->ctx, onoff);
 290         else if (cctx->ssl)
 291             rv = SSL_set_ecdh_auto(cctx->ssl, onoff);
 292     } else {
 293         EC_KEY *ecdh;
 294         int nid;
 295         nid = EC_curve_nist2nid(value);
 296         if (nid == NID_undef)
 297             nid = OBJ_sn2nid(value);
 298         if (nid == 0)
 299             return 0;
 300         ecdh = EC_KEY_new_by_curve_name(nid);
 301         if (!ecdh)
 302             return 0;
 303         if (cctx->ctx)
 304             rv = SSL_CTX_set_tmp_ecdh(cctx->ctx, ecdh);
 305         else if (cctx->ssl)
 306             rv = SSL_set_tmp_ecdh(cctx->ssl, ecdh);
 307         EC_KEY_free(ecdh);
 308     }
 309
 310     return rv > 0;
 311 }
 312 #endif
 313 static int cmd_CipherString(SSL_CONF_CTX *cctx, const char *value)
 314 {
 315     int rv = 1;
 316     if (cctx->ctx)
 317         rv = SSL_CTX_set_cipher_list(cctx->ctx, value);
 318     if (cctx->ssl)
 319         rv = SSL_set_cipher_list(cctx->ssl, value);
 320     return rv > 0;
 321 }
 322
 323 static int cmd_Protocol(SSL_CONF_CTX *cctx, const char *value)
 324 {
 325     static const ssl_flag_tbl ssl_protocol_list[] = {
 326         SSL_FLAG_TBL_INV("ALL", SSL_OP_NO_SSL_MASK),
 327         SSL_FLAG_TBL_INV("SSLv2", SSL_OP_NO_SSLv2),
 328         SSL_FLAG_TBL_INV("SSLv3", SSL_OP_NO_SSLv3),
 329         SSL_FLAG_TBL_INV("TLSv1", SSL_OP_NO_TLSv1),
 330         SSL_FLAG_TBL_INV("TLSv1.1", SSL_OP_NO_TLSv1_1),
 331         SSL_FLAG_TBL_INV("TLSv1.2", SSL_OP_NO_TLSv1_2)
 332     };
 333     if (!(cctx->flags & SSL_CONF_FLAG_FILE))
 334         return -2;
 335     cctx->tbl = ssl_protocol_list;
 336     cctx->ntbl = sizeof(ssl_protocol_list) / sizeof(ssl_flag_tbl);
 337     return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
 338 }
 339
 340 static int cmd_Options(SSL_CONF_CTX *cctx, const char *value)
 341 {
 342     static const ssl_flag_tbl ssl_option_list[] = {
 343         SSL_FLAG_TBL_INV("SessionTicket", SSL_OP_NO_TICKET),
 344         SSL_FLAG_TBL_INV("EmptyFragments",
 345                          SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS),
 346         SSL_FLAG_TBL("Bugs", SSL_OP_ALL),
 347         SSL_FLAG_TBL_INV("Compression", SSL_OP_NO_COMPRESSION),
 348         SSL_FLAG_TBL_SRV("ServerPreference", SSL_OP_CIPHER_SERVER_PREFERENCE),
 349         SSL_FLAG_TBL_SRV("NoResumptionOnRenegotiation",
 350                          SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION),
 351         SSL_FLAG_TBL_SRV("DHSingle", SSL_OP_SINGLE_DH_USE),
 352         SSL_FLAG_TBL_SRV("ECDHSingle", SSL_OP_SINGLE_ECDH_USE),
 353         SSL_FLAG_TBL("UnsafeLegacyRenegotiation",
 354                      SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION),
 355     };
 356     if (!(cctx->flags & SSL_CONF_FLAG_FILE))
 357         return -2;
 358     if (value == NULL)
 359         return -3;
 360     cctx->tbl = ssl_option_list;
 361     cctx->ntbl = sizeof(ssl_option_list) / sizeof(ssl_flag_tbl);
 362     return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
 363 }
 364
 365 static int cmd_Certificate(SSL_CONF_CTX *cctx, const char *value)
 366 {
 367     int rv = 1;
 368     if (!(cctx->flags & SSL_CONF_FLAG_CERTIFICATE))
 369         return -2;
 370     if (cctx->ctx)
 371         rv = SSL_CTX_use_certificate_chain_file(cctx->ctx, value);
 372     if (cctx->ssl)
 373         rv = SSL_use_certificate_file(cctx->ssl, value, SSL_FILETYPE_PEM);
 374     return rv > 0;
 375 }
 376
 377 static int cmd_PrivateKey(SSL_CONF_CTX *cctx, const char *value)
 378 {
 379     int rv = 1;
 380     if (!(cctx->flags & SSL_CONF_FLAG_CERTIFICATE))
 381         return -2;
 382     if (cctx->ctx)
 383         rv = SSL_CTX_use_PrivateKey_file(cctx->ctx, value, SSL_FILETYPE_PEM);
 384     if (cctx->ssl)
 385         rv = SSL_use_PrivateKey_file(cctx->ssl, value, SSL_FILETYPE_PEM);
 386     return rv > 0;
 387 }
 388
 389 static int cmd_ServerInfoFile(SSL_CONF_CTX *cctx, const char *value)
 390 {
 391     int rv = 1;
 392     if (!(cctx->flags & SSL_CONF_FLAG_CERTIFICATE))
 393         return -2;
 394     if (!(cctx->flags & SSL_CONF_FLAG_SERVER))
 395         return -2;
 396     if (cctx->ctx)
 397         rv = SSL_CTX_use_serverinfo_file(cctx->ctx, value);
 398     return rv > 0;
 399 }
 400
 401 #ifndef OPENSSL_NO_DH
 402 static int cmd_DHParameters(SSL_CONF_CTX *cctx, const char *value)
 403 {
 404     int rv = 0;
 405     DH *dh = NULL;
 406     BIO *in = NULL;
 407     if (!(cctx->flags & SSL_CONF_FLAG_CERTIFICATE))
 408         return -2;
 409     if (cctx->ctx || cctx->ssl) {
 410         in = BIO_new(BIO_s_file_internal());
 411         if (!in)
 412             goto end;
 413         if (BIO_read_filename(in, value) <= 0)
 414             goto end;
 415         dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL);
 416         if (!dh)
 417             goto end;
 418     } else
 419         return 1;
 420     if (cctx->ctx)
 421         rv = SSL_CTX_set_tmp_dh(cctx->ctx, dh);
 422     if (cctx->ssl)
 423         rv = SSL_set_tmp_dh(cctx->ssl, dh);
 424  end:
 425     if (dh)
 426         DH_free(dh);
 427     if (in)
 428         BIO_free(in);
 429     return rv > 0;
 430 }
 431 #endif
 432 typedef struct {
 433     int (*cmd) (SSL_CONF_CTX *cctx, const char *value);
 434     const char *str_file;
 435     const char *str_cmdline;
 436     unsigned int value_type;
 437 } ssl_conf_cmd_tbl;
 438
 439 /* Table of supported parameters */
 440
 441 #define SSL_CONF_CMD(name, cmdopt, type) \
 442         {cmd_##name, #name, cmdopt, type}
 443
 444 #define SSL_CONF_CMD_STRING(name, cmdopt) \
 445         SSL_CONF_CMD(name, cmdopt, SSL_CONF_TYPE_STRING)
 446
 447 static const ssl_conf_cmd_tbl ssl_conf_cmds[] = {
 448     SSL_CONF_CMD_STRING(SignatureAlgorithms, "sigalgs"),
 449     SSL_CONF_CMD_STRING(ClientSignatureAlgorithms, "client_sigalgs"),
 450     SSL_CONF_CMD_STRING(Curves, "curves"),
 451 #ifndef OPENSSL_NO_ECDH
 452     SSL_CONF_CMD_STRING(ECDHParameters, "named_curve"),
 453 #endif
 454     SSL_CONF_CMD_STRING(CipherString, "cipher"),
 455     SSL_CONF_CMD_STRING(Protocol, NULL),
 456     SSL_CONF_CMD_STRING(Options, NULL),
 457     SSL_CONF_CMD(Certificate, "cert", SSL_CONF_TYPE_FILE),
 458     SSL_CONF_CMD(PrivateKey, "key", SSL_CONF_TYPE_FILE),
 459     SSL_CONF_CMD(ServerInfoFile, NULL, SSL_CONF_TYPE_FILE),
 460 #ifndef OPENSSL_NO_DH
 461     SSL_CONF_CMD(DHParameters, "dhparam", SSL_CONF_TYPE_FILE)
 462 #endif
 463 };
 464
 465 static int ssl_conf_cmd_skip_prefix(SSL_CONF_CTX *cctx, const char **pcmd)
 466 {
 467     if (!pcmd || !*pcmd)
 468         return 0;
 469     /* If a prefix is set, check and skip */
 470     if (cctx->prefix) {
 471         if (strlen(*pcmd) <= cctx->prefixlen)
 472             return 0;
 473         if (cctx->flags & SSL_CONF_FLAG_CMDLINE &&
 474             strncmp(*pcmd, cctx->prefix, cctx->prefixlen))
 475             return 0;
 476         if (cctx->flags & SSL_CONF_FLAG_FILE &&
 477             strncasecmp(*pcmd, cctx->prefix, cctx->prefixlen))
 478             return 0;
 479         *pcmd += cctx->prefixlen;
 480     } else if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
 481         if (**pcmd != '-' || !(*pcmd)[1])
 482             return 0;
 483         *pcmd += 1;
 484     }
 485     return 1;
 486 }
 487
 488 static const ssl_conf_cmd_tbl *ssl_conf_cmd_lookup(SSL_CONF_CTX *cctx,
 489                                                    const char *cmd)
 490 {
 491     const ssl_conf_cmd_tbl *t;
 492     size_t i;
 493     if (cmd == NULL)
 494         return NULL;
 495
 496     /* Look for matching parameter name in table */
 497     for (i = 0, t = ssl_conf_cmds;
 498          i < sizeof(ssl_conf_cmds) / sizeof(ssl_conf_cmd_tbl); i++, t++) {
 499         if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
 500             if (t->str_cmdline && !strcmp(t->str_cmdline, cmd))
 501                 return t;
 502         }
 503         if (cctx->flags & SSL_CONF_FLAG_FILE) {
 504             if (t->str_file && !strcasecmp(t->str_file, cmd))
 505                 return t;
 506         }
 507     }
 508     return NULL;
 509 }
 510
 511 int SSL_CONF_cmd(SSL_CONF_CTX *cctx, const char *cmd, const char *value)
 512 {
 513     const ssl_conf_cmd_tbl *runcmd;
 514     if (cmd == NULL) {
 515         SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_INVALID_NULL_CMD_NAME);
 516         return 0;
 517     }
 518
 519     if (!ssl_conf_cmd_skip_prefix(cctx, &cmd))
 520         return -2;
 521
 522     runcmd = ssl_conf_cmd_lookup(cctx, cmd);
 523
 524     if (runcmd) {
 525         int rv;
 526         if (value == NULL)
 527             return -3;
 528         rv = runcmd->cmd(cctx, value);
 529         if (rv > 0)
 530             return 2;
 531         if (rv == -2)
 532             return -2;
 533         if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS) {
 534             SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_BAD_VALUE);
 535             ERR_add_error_data(4, "cmd=", cmd, ", value=", value);
 536         }
 537         return 0;
 538     }
 539
 540     if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
 541         if (ctrl_str_option(cctx, cmd))
 542             return 1;
 543     }
 544
 545     if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS) {
 546         SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_UNKNOWN_CMD_NAME);
 547         ERR_add_error_data(2, "cmd=", cmd);
 548     }
 549
 550     return -2;
 551 }
 552
 553 int SSL_CONF_cmd_argv(SSL_CONF_CTX *cctx, int *pargc, char ***pargv)
 554 {
 555     int rv;
 556     const char *arg = NULL, *argn;
 557     if (pargc && *pargc == 0)
 558         return 0;
 559     if (!pargc || *pargc > 0)
 560         arg = **pargv;
 561     if (arg == NULL)
 562         return 0;
 563     if (!pargc || *pargc > 1)
 564         argn = (*pargv)[1];
 565     else
 566         argn = NULL;
 567     cctx->flags &= ~SSL_CONF_FLAG_FILE;
 568     cctx->flags |= SSL_CONF_FLAG_CMDLINE;
 569     rv = SSL_CONF_cmd(cctx, arg, argn);
 570     if (rv > 0) {
 571         /* Success: update pargc, pargv */
 572         (*pargv) += rv;
 573         if (pargc)
 574             (*pargc) -= rv;
 575         return rv;
 576     }
 577     /* Unknown switch: indicate no arguments processed */
 578     if (rv == -2)
 579         return 0;
 580     /* Some error occurred processing command, return fatal error */
 581     if (rv == 0)
 582         return -1;
 583     return rv;
 584 }
 585
 586 int SSL_CONF_cmd_value_type(SSL_CONF_CTX *cctx, const char *cmd)
 587 {
 588     if (ssl_conf_cmd_skip_prefix(cctx, &cmd)) {
 589         const ssl_conf_cmd_tbl *runcmd;
 590         runcmd = ssl_conf_cmd_lookup(cctx, cmd);
 591         if (runcmd)
 592             return runcmd->value_type;
 593     }
 594     return SSL_CONF_TYPE_UNKNOWN;
 595 }
 596
 597 SSL_CONF_CTX *SSL_CONF_CTX_new(void)
 598 {
 599     SSL_CONF_CTX *ret;
 600     ret = OPENSSL_malloc(sizeof(SSL_CONF_CTX));
 601     if (ret) {
 602         ret->flags = 0;
 603         ret->prefix = NULL;
 604         ret->prefixlen = 0;
 605         ret->ssl = NULL;
 606         ret->ctx = NULL;
 607         ret->poptions = NULL;
 608         ret->pcert_flags = NULL;
 609         ret->tbl = NULL;
 610         ret->ntbl = 0;
 611     }
 612     return ret;
 613 }
 614
 615 int SSL_CONF_CTX_finish(SSL_CONF_CTX *cctx)
 616 {
 617     return 1;
 618 }
 619
 620 void SSL_CONF_CTX_free(SSL_CONF_CTX *cctx)
 621 {
 622     if (cctx) {
 623         if (cctx->prefix)
 624             OPENSSL_free(cctx->prefix);
 625         OPENSSL_free(cctx);
 626     }
 627 }
 628
 629 unsigned int SSL_CONF_CTX_set_flags(SSL_CONF_CTX *cctx, unsigned int flags)
 630 {
 631     cctx->flags |= flags;
 632     return cctx->flags;
 633 }
 634
 635 unsigned int SSL_CONF_CTX_clear_flags(SSL_CONF_CTX *cctx, unsigned int flags)
 636 {
 637     cctx->flags &= ~flags;
 638     return cctx->flags;
 639 }
 640
 641 int SSL_CONF_CTX_set1_prefix(SSL_CONF_CTX *cctx, const char *pre)
 642 {
 643     char *tmp = NULL;
 644     if (pre) {
 645         tmp = BUF_strdup(pre);
 646         if (tmp == NULL)
 647             return 0;
 648     }
 649     if (cctx->prefix)
 650         OPENSSL_free(cctx->prefix);
 651     cctx->prefix = tmp;
 652     if (tmp)
 653         cctx->prefixlen = strlen(tmp);
 654     else
 655         cctx->prefixlen = 0;
 656     return 1;
 657 }
 658
 659 void SSL_CONF_CTX_set_ssl(SSL_CONF_CTX *cctx, SSL *ssl)
 660 {
 661     cctx->ssl = ssl;
 662     cctx->ctx = NULL;
 663     if (ssl) {
 664         cctx->poptions = &ssl->options;
 665         cctx->pcert_flags = &ssl->cert->cert_flags;
 666     } else {
 667         cctx->poptions = NULL;
 668         cctx->pcert_flags = NULL;
 669     }
 670 }
 671
 672 void SSL_CONF_CTX_set_ssl_ctx(SSL_CONF_CTX *cctx, SSL_CTX *ctx)
 673 {
 674     cctx->ctx = ctx;
 675     cctx->ssl = NULL;
 676     if (ctx) {
 677         cctx->poptions = &ctx->options;
 678         cctx->pcert_flags = &ctx->cert->cert_flags;
 679     } else {
 680         cctx->poptions = NULL;
 681         cctx->pcert_flags = NULL;
 682     }
 683 }