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_ssl3", SSL_OP_NO_SSLv3),
 195         SSL_FLAG_TBL("no_tls1", SSL_OP_NO_TLSv1),
 196         SSL_FLAG_TBL("no_tls1_1", SSL_OP_NO_TLSv1_1),
 197         SSL_FLAG_TBL("no_tls1_2", SSL_OP_NO_TLSv1_2),
 198         SSL_FLAG_TBL("bugs", SSL_OP_ALL),
 199         SSL_FLAG_TBL("no_comp", SSL_OP_NO_COMPRESSION),
 200         SSL_FLAG_TBL_SRV("ecdh_single", SSL_OP_SINGLE_ECDH_USE),
 201 #ifndef OPENSSL_NO_TLSEXT
 202         SSL_FLAG_TBL("no_ticket", SSL_OP_NO_TICKET),
 203 #endif
 204         SSL_FLAG_TBL_SRV("serverpref", SSL_OP_CIPHER_SERVER_PREFERENCE),
 205         SSL_FLAG_TBL("legacy_renegotiation",
 206                      SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION),
 207         SSL_FLAG_TBL_SRV("legacy_server_connect",
 208                          SSL_OP_LEGACY_SERVER_CONNECT),
 209         SSL_FLAG_TBL_SRV("no_resumption_on_reneg",
 210                          SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION),
 211         SSL_FLAG_TBL_SRV_INV("no_legacy_server_connect",
 212                              SSL_OP_LEGACY_SERVER_CONNECT),
 213         SSL_FLAG_TBL_CERT("strict", SSL_CERT_FLAG_TLS_STRICT),
 214 #ifdef OPENSSL_SSL_DEBUG_BROKEN_PROTOCOL
 215         SSL_FLAG_TBL_CERT("debug_broken_protocol",
 216                           SSL_CERT_FLAG_BROKEN_PROTOCOL),
 217 #endif
 218     };
 219     cctx->tbl = ssl_option_single;
 220     cctx->ntbl = sizeof(ssl_option_single) / sizeof(ssl_flag_tbl);
 221     return ssl_set_option_list(cmd, -1, cctx);
 222 }
 223
 224 /* Set supported signature algorithms */
 225 static int cmd_SignatureAlgorithms(SSL_CONF_CTX *cctx, const char *value)
 226 {
 227     int rv;
 228     if (cctx->ssl)
 229         rv = SSL_set1_sigalgs_list(cctx->ssl, value);
 230     /* NB: ctx == NULL performs syntax checking only */
 231     else
 232         rv = SSL_CTX_set1_sigalgs_list(cctx->ctx, value);
 233     return rv > 0;
 234 }
 235
 236 /* Set supported client signature algorithms */
 237 static int cmd_ClientSignatureAlgorithms(SSL_CONF_CTX *cctx,
 238                                          const char *value)
 239 {
 240     int rv;
 241     if (cctx->ssl)
 242         rv = SSL_set1_client_sigalgs_list(cctx->ssl, value);
 243     /* NB: ctx == NULL performs syntax checking only */
 244     else
 245         rv = SSL_CTX_set1_client_sigalgs_list(cctx->ctx, value);
 246     return rv > 0;
 247 }
 248
 249 static int cmd_Curves(SSL_CONF_CTX *cctx, const char *value)
 250 {
 251     int rv;
 252     if (cctx->ssl)
 253         rv = SSL_set1_curves_list(cctx->ssl, value);
 254     /* NB: ctx == NULL performs syntax checking only */
 255     else
 256         rv = SSL_CTX_set1_curves_list(cctx->ctx, value);
 257     return rv > 0;
 258 }
 259
 260 #ifndef OPENSSL_NO_EC
 261 /* ECDH temporary parameters */
 262 static int cmd_ECDHParameters(SSL_CONF_CTX *cctx, const char *value)
 263 {
 264     int onoff = -1, rv = 1;
 265     if (!(cctx->flags & SSL_CONF_FLAG_SERVER))
 266         return -2;
 267     if (cctx->flags & SSL_CONF_FLAG_FILE) {
 268         if (*value == '+') {
 269             onoff = 1;
 270             value++;
 271         }
 272         if (*value == '-') {
 273             onoff = 0;
 274             value++;
 275         }
 276         if (!strcasecmp(value, "automatic")) {
 277             if (onoff == -1)
 278                 onoff = 1;
 279         } else if (onoff != -1)
 280             return 0;
 281     } else if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
 282         if (!strcmp(value, "auto"))
 283             onoff = 1;
 284     }
 285
 286     if (onoff != -1) {
 287         if (cctx->ctx)
 288             rv = SSL_CTX_set_ecdh_auto(cctx->ctx, onoff);
 289         else if (cctx->ssl)
 290             rv = SSL_set_ecdh_auto(cctx->ssl, onoff);
 291     } else {
 292         EC_KEY *ecdh;
 293         int nid;
 294         nid = EC_curve_nist2nid(value);
 295         if (nid == NID_undef)
 296             nid = OBJ_sn2nid(value);
 297         if (nid == 0)
 298             return 0;
 299         ecdh = EC_KEY_new_by_curve_name(nid);
 300         if (!ecdh)
 301             return 0;
 302         if (cctx->ctx)
 303             rv = SSL_CTX_set_tmp_ecdh(cctx->ctx, ecdh);
 304         else if (cctx->ssl)
 305             rv = SSL_set_tmp_ecdh(cctx->ssl, ecdh);
 306         EC_KEY_free(ecdh);
 307     }
 308
 309     return rv > 0;
 310 }
 311 #endif
 312 static int cmd_CipherString(SSL_CONF_CTX *cctx, const char *value)
 313 {
 314     int rv = 1;
 315     if (cctx->ctx)
 316         rv = SSL_CTX_set_cipher_list(cctx->ctx, value);
 317     if (cctx->ssl)
 318         rv = SSL_set_cipher_list(cctx->ssl, value);
 319     return rv > 0;
 320 }
 321
 322 static int cmd_Protocol(SSL_CONF_CTX *cctx, const char *value)
 323 {
 324     static const ssl_flag_tbl ssl_protocol_list[] = {
 325         SSL_FLAG_TBL_INV("ALL", SSL_OP_NO_SSL_MASK),
 326         SSL_FLAG_TBL_INV("SSLv2", SSL_OP_NO_SSLv2),
 327         SSL_FLAG_TBL_INV("SSLv3", SSL_OP_NO_SSLv3),
 328         SSL_FLAG_TBL_INV("TLSv1", SSL_OP_NO_TLSv1),
 329         SSL_FLAG_TBL_INV("TLSv1.1", SSL_OP_NO_TLSv1_1),
 330         SSL_FLAG_TBL_INV("TLSv1.2", SSL_OP_NO_TLSv1_2)
 331     };
 332     if (!(cctx->flags & SSL_CONF_FLAG_FILE))
 333         return -2;
 334     cctx->tbl = ssl_protocol_list;
 335     cctx->ntbl = sizeof(ssl_protocol_list) / sizeof(ssl_flag_tbl);
 336     return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
 337 }
 338
 339 static int cmd_Options(SSL_CONF_CTX *cctx, const char *value)
 340 {
 341     static const ssl_flag_tbl ssl_option_list[] = {
 342         SSL_FLAG_TBL_INV("SessionTicket", SSL_OP_NO_TICKET),
 343         SSL_FLAG_TBL_INV("EmptyFragments",
 344                          SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS),
 345         SSL_FLAG_TBL("Bugs", SSL_OP_ALL),
 346         SSL_FLAG_TBL_INV("Compression", SSL_OP_NO_COMPRESSION),
 347         SSL_FLAG_TBL_SRV("ServerPreference", SSL_OP_CIPHER_SERVER_PREFERENCE),
 348         SSL_FLAG_TBL_SRV("NoResumptionOnRenegotiation",
 349                          SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION),
 350         SSL_FLAG_TBL_SRV("DHSingle", SSL_OP_SINGLE_DH_USE),
 351         SSL_FLAG_TBL_SRV("ECDHSingle", SSL_OP_SINGLE_ECDH_USE),
 352         SSL_FLAG_TBL("UnsafeLegacyRenegotiation",
 353                      SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION),
 354     };
 355     if (!(cctx->flags & SSL_CONF_FLAG_FILE))
 356         return -2;
 357     if (value == NULL)
 358         return -3;
 359     cctx->tbl = ssl_option_list;
 360     cctx->ntbl = sizeof(ssl_option_list) / sizeof(ssl_flag_tbl);
 361     return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
 362 }
 363
 364 static int cmd_Certificate(SSL_CONF_CTX *cctx, const char *value)
 365 {
 366     int rv = 1;
 367     if (!(cctx->flags & SSL_CONF_FLAG_CERTIFICATE))
 368         return -2;
 369     if (cctx->ctx)
 370         rv = SSL_CTX_use_certificate_chain_file(cctx->ctx, value);
 371     if (cctx->ssl)
 372         rv = SSL_use_certificate_file(cctx->ssl, value, SSL_FILETYPE_PEM);
 373     return rv > 0;
 374 }
 375
 376 static int cmd_PrivateKey(SSL_CONF_CTX *cctx, const char *value)
 377 {
 378     int rv = 1;
 379     if (!(cctx->flags & SSL_CONF_FLAG_CERTIFICATE))
 380         return -2;
 381     if (cctx->ctx)
 382         rv = SSL_CTX_use_PrivateKey_file(cctx->ctx, value, SSL_FILETYPE_PEM);
 383     if (cctx->ssl)
 384         rv = SSL_use_PrivateKey_file(cctx->ssl, value, SSL_FILETYPE_PEM);
 385     return rv > 0;
 386 }
 387
 388 static int cmd_ServerInfoFile(SSL_CONF_CTX *cctx, const char *value)
 389 {
 390     int rv = 1;
 391     if (!(cctx->flags & SSL_CONF_FLAG_CERTIFICATE))
 392         return -2;
 393     if (!(cctx->flags & SSL_CONF_FLAG_SERVER))
 394         return -2;
 395     if (cctx->ctx)
 396         rv = SSL_CTX_use_serverinfo_file(cctx->ctx, value);
 397     return rv > 0;
 398 }
 399
 400 #ifndef OPENSSL_NO_DH
 401 static int cmd_DHParameters(SSL_CONF_CTX *cctx, const char *value)
 402 {
 403     int rv = 0;
 404     DH *dh = NULL;
 405     BIO *in = NULL;
 406     if (!(cctx->flags & SSL_CONF_FLAG_CERTIFICATE))
 407         return -2;
 408     if (cctx->ctx || cctx->ssl) {
 409         in = BIO_new(BIO_s_file_internal());
 410         if (!in)
 411             goto end;
 412         if (BIO_read_filename(in, value) <= 0)
 413             goto end;
 414         dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL);
 415         if (!dh)
 416             goto end;
 417     } else
 418         return 1;
 419     if (cctx->ctx)
 420         rv = SSL_CTX_set_tmp_dh(cctx->ctx, dh);
 421     if (cctx->ssl)
 422         rv = SSL_set_tmp_dh(cctx->ssl, dh);
 423  end:
 424     DH_free(dh);
 425     if (in)
 426         BIO_free(in);
 427     return rv > 0;
 428 }
 429 #endif
 430 typedef struct {
 431     int (*cmd) (SSL_CONF_CTX *cctx, const char *value);
 432     const char *str_file;
 433     const char *str_cmdline;
 434     unsigned int value_type;
 435 } ssl_conf_cmd_tbl;
 436
 437 /* Table of supported parameters */
 438
 439 #define SSL_CONF_CMD(name, cmdopt, type) \
 440         {cmd_##name, #name, cmdopt, type}
 441
 442 #define SSL_CONF_CMD_STRING(name, cmdopt) \
 443         SSL_CONF_CMD(name, cmdopt, SSL_CONF_TYPE_STRING)
 444
 445 static const ssl_conf_cmd_tbl ssl_conf_cmds[] = {
 446     SSL_CONF_CMD_STRING(SignatureAlgorithms, "sigalgs"),
 447     SSL_CONF_CMD_STRING(ClientSignatureAlgorithms, "client_sigalgs"),
 448     SSL_CONF_CMD_STRING(Curves, "curves"),
 449 #ifndef OPENSSL_NO_EC
 450     SSL_CONF_CMD_STRING(ECDHParameters, "named_curve"),
 451 #endif
 452     SSL_CONF_CMD_STRING(CipherString, "cipher"),
 453     SSL_CONF_CMD_STRING(Protocol, NULL),
 454     SSL_CONF_CMD_STRING(Options, NULL),
 455     SSL_CONF_CMD(Certificate, "cert", SSL_CONF_TYPE_FILE),
 456     SSL_CONF_CMD(PrivateKey, "key", SSL_CONF_TYPE_FILE),
 457     SSL_CONF_CMD(ServerInfoFile, NULL, SSL_CONF_TYPE_FILE),
 458 #ifndef OPENSSL_NO_DH
 459     SSL_CONF_CMD(DHParameters, "dhparam", SSL_CONF_TYPE_FILE)
 460 #endif
 461 };
 462
 463 static int ssl_conf_cmd_skip_prefix(SSL_CONF_CTX *cctx, const char **pcmd)
 464 {
 465     if (!pcmd || !*pcmd)
 466         return 0;
 467     /* If a prefix is set, check and skip */
 468     if (cctx->prefix) {
 469         if (strlen(*pcmd) <= cctx->prefixlen)
 470             return 0;
 471         if (cctx->flags & SSL_CONF_FLAG_CMDLINE &&
 472             strncmp(*pcmd, cctx->prefix, cctx->prefixlen))
 473             return 0;
 474         if (cctx->flags & SSL_CONF_FLAG_FILE &&
 475             strncasecmp(*pcmd, cctx->prefix, cctx->prefixlen))
 476             return 0;
 477         *pcmd += cctx->prefixlen;
 478     } else if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
 479         if (**pcmd != '-' || !(*pcmd)[1])
 480             return 0;
 481         *pcmd += 1;
 482     }
 483     return 1;
 484 }
 485
 486 static const ssl_conf_cmd_tbl *ssl_conf_cmd_lookup(SSL_CONF_CTX *cctx,
 487                                                    const char *cmd)
 488 {
 489     const ssl_conf_cmd_tbl *t;
 490     size_t i;
 491     if (cmd == NULL)
 492         return NULL;
 493
 494     /* Look for matching parameter name in table */
 495     for (i = 0, t = ssl_conf_cmds;
 496          i < sizeof(ssl_conf_cmds) / sizeof(ssl_conf_cmd_tbl); i++, t++) {
 497         if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
 498             if (t->str_cmdline && !strcmp(t->str_cmdline, cmd))
 499                 return t;
 500         }
 501         if (cctx->flags & SSL_CONF_FLAG_FILE) {
 502             if (t->str_file && !strcasecmp(t->str_file, cmd))
 503                 return t;
 504         }
 505     }
 506     return NULL;
 507 }
 508
 509 int SSL_CONF_cmd(SSL_CONF_CTX *cctx, const char *cmd, const char *value)
 510 {
 511     const ssl_conf_cmd_tbl *runcmd;
 512     if (cmd == NULL) {
 513         SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_INVALID_NULL_CMD_NAME);
 514         return 0;
 515     }
 516
 517     if (!ssl_conf_cmd_skip_prefix(cctx, &cmd))
 518         return -2;
 519
 520     runcmd = ssl_conf_cmd_lookup(cctx, cmd);
 521
 522     if (runcmd) {
 523         int rv;
 524         if (value == NULL)
 525             return -3;
 526         rv = runcmd->cmd(cctx, value);
 527         if (rv > 0)
 528             return 2;
 529         if (rv == -2)
 530             return -2;
 531         if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS) {
 532             SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_BAD_VALUE);
 533             ERR_add_error_data(4, "cmd=", cmd, ", value=", value);
 534         }
 535         return 0;
 536     }
 537
 538     if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
 539         if (ctrl_str_option(cctx, cmd))
 540             return 1;
 541     }
 542
 543     if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS) {
 544         SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_UNKNOWN_CMD_NAME);
 545         ERR_add_error_data(2, "cmd=", cmd);
 546     }
 547
 548     return -2;
 549 }
 550
 551 int SSL_CONF_cmd_argv(SSL_CONF_CTX *cctx, int *pargc, char ***pargv)
 552 {
 553     int rv;
 554     const char *arg = NULL, *argn;
 555     if (pargc && *pargc == 0)
 556         return 0;
 557     if (!pargc || *pargc > 0)
 558         arg = **pargv;
 559     if (arg == NULL)
 560         return 0;
 561     if (!pargc || *pargc > 1)
 562         argn = (*pargv)[1];
 563     else
 564         argn = NULL;
 565     cctx->flags &= ~SSL_CONF_FLAG_FILE;
 566     cctx->flags |= SSL_CONF_FLAG_CMDLINE;
 567     rv = SSL_CONF_cmd(cctx, arg, argn);
 568     if (rv > 0) {
 569         /* Success: update pargc, pargv */
 570         (*pargv) += rv;
 571         if (pargc)
 572             (*pargc) -= rv;
 573         return rv;
 574     }
 575     /* Unknown switch: indicate no arguments processed */
 576     if (rv == -2)
 577         return 0;
 578     /* Some error occurred processing command, return fatal error */
 579     if (rv == 0)
 580         return -1;
 581     return rv;
 582 }
 583
 584 int SSL_CONF_cmd_value_type(SSL_CONF_CTX *cctx, const char *cmd)
 585 {
 586     if (ssl_conf_cmd_skip_prefix(cctx, &cmd)) {
 587         const ssl_conf_cmd_tbl *runcmd;
 588         runcmd = ssl_conf_cmd_lookup(cctx, cmd);
 589         if (runcmd)
 590             return runcmd->value_type;
 591     }
 592     return SSL_CONF_TYPE_UNKNOWN;
 593 }
 594
 595 SSL_CONF_CTX *SSL_CONF_CTX_new(void)
 596 {
 597     SSL_CONF_CTX *ret;
 598     ret = OPENSSL_malloc(sizeof(SSL_CONF_CTX));
 599     if (ret) {
 600         ret->flags = 0;
 601         ret->prefix = NULL;
 602         ret->prefixlen = 0;
 603         ret->ssl = NULL;
 604         ret->ctx = NULL;
 605         ret->poptions = NULL;
 606         ret->pcert_flags = NULL;
 607         ret->tbl = NULL;
 608         ret->ntbl = 0;
 609     }
 610     return ret;
 611 }
 612
 613 int SSL_CONF_CTX_finish(SSL_CONF_CTX *cctx)
 614 {
 615     return 1;
 616 }
 617
 618 void SSL_CONF_CTX_free(SSL_CONF_CTX *cctx)
 619 {
 620     if (cctx) {
 621         if (cctx->prefix)
 622             OPENSSL_free(cctx->prefix);
 623         OPENSSL_free(cctx);
 624     }
 625 }
 626
 627 unsigned int SSL_CONF_CTX_set_flags(SSL_CONF_CTX *cctx, unsigned int flags)
 628 {
 629     cctx->flags |= flags;
 630     return cctx->flags;
 631 }
 632
 633 unsigned int SSL_CONF_CTX_clear_flags(SSL_CONF_CTX *cctx, unsigned int flags)
 634 {
 635     cctx->flags &= ~flags;
 636     return cctx->flags;
 637 }
 638
 639 int SSL_CONF_CTX_set1_prefix(SSL_CONF_CTX *cctx, const char *pre)
 640 {
 641     char *tmp = NULL;
 642     if (pre) {
 643         tmp = BUF_strdup(pre);
 644         if (tmp == NULL)
 645             return 0;
 646     }
 647     if (cctx->prefix)
 648         OPENSSL_free(cctx->prefix);
 649     cctx->prefix = tmp;
 650     if (tmp)
 651         cctx->prefixlen = strlen(tmp);
 652     else
 653         cctx->prefixlen = 0;
 654     return 1;
 655 }
 656
 657 void SSL_CONF_CTX_set_ssl(SSL_CONF_CTX *cctx, SSL *ssl)
 658 {
 659     cctx->ssl = ssl;
 660     cctx->ctx = NULL;
 661     if (ssl) {
 662         cctx->poptions = &ssl->options;
 663         cctx->pcert_flags = &ssl->cert->cert_flags;
 664     } else {
 665         cctx->poptions = NULL;
 666         cctx->pcert_flags = NULL;
 667     }
 668 }
 669
 670 void SSL_CONF_CTX_set_ssl_ctx(SSL_CONF_CTX *cctx, SSL_CTX *ctx)
 671 {
 672     cctx->ctx = ctx;
 673     cctx->ssl = NULL;
 674     if (ctx) {
 675         cctx->poptions = &ctx->options;
 676         cctx->pcert_flags = &ctx->cert->cert_flags;
 677     } else {
 678         cctx->poptions = NULL;
 679         cctx->pcert_flags = NULL;
 680     }
 681 }