ssl/ssl_conf.c

   1 /*
   2  * Copyright 2012-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <stdio.h>
  11 #include "ssl_locl.h"
  12 #include <openssl/conf.h>
  13 #include <openssl/objects.h>
  14 #include <openssl/dh.h>
  15
  16 /*
  17  * structure holding name tables. This is used for pemitted elements in lists
  18  * such as TLSv1.
  19  */
  20
  21 typedef struct {
  22     const char *name;
  23     int namelen;
  24     unsigned int name_flags;
  25     unsigned long option_value;
  26 } ssl_flag_tbl;
  27
  28 /* Switch table: use for single command line switches like no_tls2 */
  29 typedef struct {
  30     unsigned long option_value;
  31     unsigned int name_flags;
  32 } ssl_switch_tbl;
  33
  34 /* Sense of name is inverted e.g. "TLSv1" will clear SSL_OP_NO_TLSv1 */
  35 #define SSL_TFLAG_INV   0x1
  36 /* Mask for type of flag referred to */
  37 #define SSL_TFLAG_TYPE_MASK 0xf00
  38 /* Flag is for options */
  39 #define SSL_TFLAG_OPTION    0x000
  40 /* Flag is for cert_flags */
  41 #define SSL_TFLAG_CERT      0x100
  42 /* Flag is for verify mode */
  43 #define SSL_TFLAG_VFY       0x200
  44 /* Option can only be used for clients */
  45 #define SSL_TFLAG_CLIENT SSL_CONF_FLAG_CLIENT
  46 /* Option can only be used for servers */
  47 #define SSL_TFLAG_SERVER SSL_CONF_FLAG_SERVER
  48 #define SSL_TFLAG_BOTH (SSL_TFLAG_CLIENT|SSL_TFLAG_SERVER)
  49
  50 #define SSL_FLAG_TBL(str, flag) \
  51         {str, (int)(sizeof(str) - 1), SSL_TFLAG_BOTH, flag}
  52 #define SSL_FLAG_TBL_SRV(str, flag) \
  53         {str, (int)(sizeof(str) - 1), SSL_TFLAG_SERVER, flag}
  54 #define SSL_FLAG_TBL_CLI(str, flag) \
  55         {str, (int)(sizeof(str) - 1), SSL_TFLAG_CLIENT, flag}
  56 #define SSL_FLAG_TBL_INV(str, flag) \
  57         {str, (int)(sizeof(str) - 1), SSL_TFLAG_INV|SSL_TFLAG_BOTH, flag}
  58 #define SSL_FLAG_TBL_SRV_INV(str, flag) \
  59         {str, (int)(sizeof(str) - 1), SSL_TFLAG_INV|SSL_TFLAG_SERVER, flag}
  60 #define SSL_FLAG_TBL_CERT(str, flag) \
  61         {str, (int)(sizeof(str) - 1), SSL_TFLAG_CERT|SSL_TFLAG_BOTH, flag}
  62
  63 #define SSL_FLAG_VFY_CLI(str, flag) \
  64         {str, (int)(sizeof(str) - 1), SSL_TFLAG_VFY | SSL_TFLAG_CLIENT, flag}
  65 #define SSL_FLAG_VFY_SRV(str, flag) \
  66         {str, (int)(sizeof(str) - 1), SSL_TFLAG_VFY | SSL_TFLAG_SERVER, flag}
  67
  68 /*
  69  * Opaque structure containing SSL configuration context.
  70  */
  71
  72 struct ssl_conf_ctx_st {
  73     /*
  74      * Various flags indicating (among other things) which options we will
  75      * recognise.
  76      */
  77     unsigned int flags;
  78     /* Prefix and length of commands */
  79     char *prefix;
  80     size_t prefixlen;
  81     /* SSL_CTX or SSL structure to perform operations on */
  82     SSL_CTX *ctx;
  83     SSL *ssl;
  84     /* Pointer to SSL or SSL_CTX options field or NULL if none */
  85     uint32_t *poptions;
  86     /* Certificate filenames for each type */
  87     char *cert_filename[SSL_PKEY_NUM];
  88     /* Pointer to SSL or SSL_CTX cert_flags or NULL if none */
  89     uint32_t *pcert_flags;
  90     /* Pointer to SSL or SSL_CTX verify_mode or NULL if none */
  91     uint32_t *pvfy_flags;
  92     /* Pointer to SSL or SSL_CTX min_version field or NULL if none */
  93     int *min_version;
  94     /* Pointer to SSL or SSL_CTX max_version field or NULL if none */
  95     int *max_version;
  96     /* Current flag table being worked on */
  97     const ssl_flag_tbl *tbl;
  98     /* Size of table */
  99     size_t ntbl;
 100     /* Client CA names */
 101     STACK_OF(X509_NAME) *canames;
 102 };
 103
 104 static void ssl_set_option(SSL_CONF_CTX *cctx, unsigned int name_flags,
 105                            unsigned long option_value, int onoff)
 106 {
 107     uint32_t *pflags;
 108     if (cctx->poptions == NULL)
 109         return;
 110     if (name_flags & SSL_TFLAG_INV)
 111         onoff ^= 1;
 112     switch (name_flags & SSL_TFLAG_TYPE_MASK) {
 113
 114     case SSL_TFLAG_CERT:
 115         pflags = cctx->pcert_flags;
 116         break;
 117
 118     case SSL_TFLAG_VFY:
 119         pflags =  cctx->pvfy_flags;
 120         break;
 121
 122     case SSL_TFLAG_OPTION:
 123         pflags = cctx->poptions;
 124         break;
 125
 126     default:
 127         return;
 128
 129     }
 130     if (onoff)
 131         *pflags |= option_value;
 132     else
 133         *pflags &= ~option_value;
 134 }
 135
 136 static int ssl_match_option(SSL_CONF_CTX *cctx, const ssl_flag_tbl *tbl,
 137                             const char *name, int namelen, int onoff)
 138 {
 139     /* If name not relevant for context skip */
 140     if (!(cctx->flags & tbl->name_flags & SSL_TFLAG_BOTH))
 141         return 0;
 142     if (namelen == -1) {
 143         if (strcmp(tbl->name, name))
 144             return 0;
 145     } else if (tbl->namelen != namelen
 146                || strncasecmp(tbl->name, name, namelen))
 147         return 0;
 148     ssl_set_option(cctx, tbl->name_flags, tbl->option_value, onoff);
 149     return 1;
 150 }
 151
 152 static int ssl_set_option_list(const char *elem, int len, void *usr)
 153 {
 154     SSL_CONF_CTX *cctx = usr;
 155     size_t i;
 156     const ssl_flag_tbl *tbl;
 157     int onoff = 1;
 158     /*
 159      * len == -1 indicates not being called in list context, just for single
 160      * command line switches, so don't allow +, -.
 161      */
 162     if (elem == NULL)
 163         return 0;
 164     if (len != -1) {
 165         if (*elem == '+') {
 166             elem++;
 167             len--;
 168             onoff = 1;
 169         } else if (*elem == '-') {
 170             elem++;
 171             len--;
 172             onoff = 0;
 173         }
 174     }
 175     for (i = 0, tbl = cctx->tbl; i < cctx->ntbl; i++, tbl++) {
 176         if (ssl_match_option(cctx, tbl, elem, len, onoff))
 177             return 1;
 178     }
 179     return 0;
 180 }
 181
 182 /* Set supported signature algorithms */
 183 static int cmd_SignatureAlgorithms(SSL_CONF_CTX *cctx, const char *value)
 184 {
 185     int rv;
 186     if (cctx->ssl)
 187         rv = SSL_set1_sigalgs_list(cctx->ssl, value);
 188     /* NB: ctx == NULL performs syntax checking only */
 189     else
 190         rv = SSL_CTX_set1_sigalgs_list(cctx->ctx, value);
 191     return rv > 0;
 192 }
 193
 194 /* Set supported client signature algorithms */
 195 static int cmd_ClientSignatureAlgorithms(SSL_CONF_CTX *cctx,
 196                                          const char *value)
 197 {
 198     int rv;
 199     if (cctx->ssl)
 200         rv = SSL_set1_client_sigalgs_list(cctx->ssl, value);
 201     /* NB: ctx == NULL performs syntax checking only */
 202     else
 203         rv = SSL_CTX_set1_client_sigalgs_list(cctx->ctx, value);
 204     return rv > 0;
 205 }
 206
 207 static int cmd_Curves(SSL_CONF_CTX *cctx, const char *value)
 208 {
 209     int rv;
 210     if (cctx->ssl)
 211         rv = SSL_set1_curves_list(cctx->ssl, value);
 212     /* NB: ctx == NULL performs syntax checking only */
 213     else
 214         rv = SSL_CTX_set1_curves_list(cctx->ctx, value);
 215     return rv > 0;
 216 }
 217
 218 #ifndef OPENSSL_NO_EC
 219 /* ECDH temporary parameters */
 220 static int cmd_ECDHParameters(SSL_CONF_CTX *cctx, const char *value)
 221 {
 222     int rv = 1;
 223     EC_KEY *ecdh;
 224     int nid;
 225
 226     nid = EC_curve_nist2nid(value);
 227     if (nid == NID_undef)
 228         nid = OBJ_sn2nid(value);
 229     if (nid == 0)
 230         return 0;
 231     ecdh = EC_KEY_new_by_curve_name(nid);
 232     if (!ecdh)
 233         return 0;
 234     if (cctx->ctx)
 235         rv = SSL_CTX_set_tmp_ecdh(cctx->ctx, ecdh);
 236     else if (cctx->ssl)
 237         rv = SSL_set_tmp_ecdh(cctx->ssl, ecdh);
 238     EC_KEY_free(ecdh);
 239
 240     return rv > 0;
 241 }
 242 #endif
 243 static int cmd_CipherString(SSL_CONF_CTX *cctx, const char *value)
 244 {
 245     int rv = 1;
 246     if (cctx->ctx)
 247         rv = SSL_CTX_set_cipher_list(cctx->ctx, value);
 248     if (cctx->ssl)
 249         rv = SSL_set_cipher_list(cctx->ssl, value);
 250     return rv > 0;
 251 }
 252
 253 static int cmd_Protocol(SSL_CONF_CTX *cctx, const char *value)
 254 {
 255     static const ssl_flag_tbl ssl_protocol_list[] = {
 256         SSL_FLAG_TBL_INV("ALL", SSL_OP_NO_SSL_MASK),
 257         SSL_FLAG_TBL_INV("SSLv2", SSL_OP_NO_SSLv2),
 258         SSL_FLAG_TBL_INV("SSLv3", SSL_OP_NO_SSLv3),
 259         SSL_FLAG_TBL_INV("TLSv1", SSL_OP_NO_TLSv1),
 260         SSL_FLAG_TBL_INV("TLSv1.1", SSL_OP_NO_TLSv1_1),
 261         SSL_FLAG_TBL_INV("TLSv1.2", SSL_OP_NO_TLSv1_2),
 262         SSL_FLAG_TBL_INV("DTLSv1", SSL_OP_NO_DTLSv1),
 263         SSL_FLAG_TBL_INV("DTLSv1.2", SSL_OP_NO_DTLSv1_2)
 264     };
 265     cctx->tbl = ssl_protocol_list;
 266     cctx->ntbl = OSSL_NELEM(ssl_protocol_list);
 267     return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
 268 }
 269
 270 /*
 271  * protocol_from_string - converts a protocol version string to a number
 272  *
 273  * Returns -1 on failure or the version on success
 274  */
 275 static int protocol_from_string(const char *value)
 276 {
 277     struct protocol_versions {
 278         const char *name;
 279         int version;
 280     };
 281     static const struct protocol_versions versions[] = {
 282         {"None", 0},
 283         {"SSLv3", SSL3_VERSION},
 284         {"TLSv1", TLS1_VERSION},
 285         {"TLSv1.1", TLS1_1_VERSION},
 286         {"TLSv1.2", TLS1_2_VERSION},
 287         {"DTLSv1", DTLS1_VERSION},
 288         {"DTLSv1.2", DTLS1_2_VERSION}};
 289     size_t i;
 290     size_t n = OSSL_NELEM(versions);
 291
 292     for (i = 0; i < n; i++)
 293         if (strcmp(versions[i].name, value) == 0)
 294             return versions[i].version;
 295     return -1;
 296 }
 297
 298 static int min_max_proto(SSL_CONF_CTX *cctx, const char *value, int *bound)
 299 {
 300     int method_version;
 301     int new_version;
 302
 303     if (cctx->ctx != NULL)
 304         method_version = cctx->ctx->method->version;
 305     else if (cctx->ssl != NULL)
 306         method_version = cctx->ssl->ctx->method->version;
 307     else
 308         return 0;
 309     if ((new_version = protocol_from_string(value)) < 0)
 310         return 0;
 311     return ssl_set_version_bound(method_version, new_version, bound);
 312 }
 313
 314 /*
 315  * cmd_MinProtocol - Set min protocol version
 316  * @cctx: config structure to save settings in
 317  * @value: The min protocol version in string form
 318  *
 319  * Returns 1 on success and 0 on failure.
 320  */
 321 static int cmd_MinProtocol(SSL_CONF_CTX *cctx, const char *value)
 322 {
 323     return min_max_proto(cctx, value, cctx->min_version);
 324 }
 325
 326 /*
 327  * cmd_MaxProtocol - Set max protocol version
 328  * @cctx: config structure to save settings in
 329  * @value: The max protocol version in string form
 330  *
 331  * Returns 1 on success and 0 on failure.
 332  */
 333 static int cmd_MaxProtocol(SSL_CONF_CTX *cctx, const char *value)
 334 {
 335     return min_max_proto(cctx, value, cctx->max_version);
 336 }
 337
 338 static int cmd_Options(SSL_CONF_CTX *cctx, const char *value)
 339 {
 340     static const ssl_flag_tbl ssl_option_list[] = {
 341         SSL_FLAG_TBL_INV("SessionTicket", SSL_OP_NO_TICKET),
 342         SSL_FLAG_TBL_INV("EmptyFragments",
 343                          SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS),
 344         SSL_FLAG_TBL("Bugs", SSL_OP_ALL),
 345         SSL_FLAG_TBL_INV("Compression", SSL_OP_NO_COMPRESSION),
 346         SSL_FLAG_TBL_SRV("ServerPreference", SSL_OP_CIPHER_SERVER_PREFERENCE),
 347         SSL_FLAG_TBL_SRV("NoResumptionOnRenegotiation",
 348                          SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION),
 349         SSL_FLAG_TBL_SRV("DHSingle", SSL_OP_SINGLE_DH_USE),
 350         SSL_FLAG_TBL_SRV("ECDHSingle", SSL_OP_SINGLE_ECDH_USE),
 351         SSL_FLAG_TBL("UnsafeLegacyRenegotiation",
 352                      SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION),
 353     };
 354     if (value == NULL)
 355         return -3;
 356     cctx->tbl = ssl_option_list;
 357     cctx->ntbl = OSSL_NELEM(ssl_option_list);
 358     return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
 359 }
 360
 361 static int cmd_VerifyMode(SSL_CONF_CTX *cctx, const char *value)
 362 {
 363     static const ssl_flag_tbl ssl_vfy_list[] = {
 364         SSL_FLAG_VFY_CLI("Peer", SSL_VERIFY_PEER),
 365         SSL_FLAG_VFY_SRV("Request", SSL_VERIFY_PEER),
 366         SSL_FLAG_VFY_SRV("Require",
 367                          SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT),
 368         SSL_FLAG_VFY_SRV("Once", SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE)
 369     };
 370     if (value == NULL)
 371         return -3;
 372     cctx->tbl = ssl_vfy_list;
 373     cctx->ntbl = OSSL_NELEM(ssl_vfy_list);
 374     return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
 375 }
 376
 377 static int cmd_Certificate(SSL_CONF_CTX *cctx, const char *value)
 378 {
 379     int rv = 1;
 380     CERT *c = NULL;
 381     if (cctx->ctx) {
 382         rv = SSL_CTX_use_certificate_chain_file(cctx->ctx, value);
 383         c = cctx->ctx->cert;
 384     }
 385     if (cctx->ssl) {
 386         rv = SSL_use_certificate_chain_file(cctx->ssl, value);
 387         c = cctx->ssl->cert;
 388     }
 389     if (rv > 0 && c && cctx->flags & SSL_CONF_FLAG_REQUIRE_PRIVATE) {
 390         char **pfilename = &cctx->cert_filename[c->key - c->pkeys];
 391         OPENSSL_free(*pfilename);
 392         *pfilename = OPENSSL_strdup(value);
 393         if (!*pfilename)
 394             rv = 0;
 395     }
 396
 397     return rv > 0;
 398 }
 399
 400 static int cmd_PrivateKey(SSL_CONF_CTX *cctx, const char *value)
 401 {
 402     int rv = 1;
 403     if (!(cctx->flags & SSL_CONF_FLAG_CERTIFICATE))
 404         return -2;
 405     if (cctx->ctx)
 406         rv = SSL_CTX_use_PrivateKey_file(cctx->ctx, value, SSL_FILETYPE_PEM);
 407     if (cctx->ssl)
 408         rv = SSL_use_PrivateKey_file(cctx->ssl, value, SSL_FILETYPE_PEM);
 409     return rv > 0;
 410 }
 411
 412 static int cmd_ServerInfoFile(SSL_CONF_CTX *cctx, const char *value)
 413 {
 414     int rv = 1;
 415     if (cctx->ctx)
 416         rv = SSL_CTX_use_serverinfo_file(cctx->ctx, value);
 417     return rv > 0;
 418 }
 419
 420 static int do_store(SSL_CONF_CTX *cctx,
 421                     const char *CAfile, const char *CApath, int verify_store)
 422 {
 423     CERT *cert;
 424     X509_STORE **st;
 425     if (cctx->ctx)
 426         cert = cctx->ctx->cert;
 427     else if (cctx->ssl)
 428         cert = cctx->ssl->cert;
 429     else
 430         return 1;
 431     st = verify_store ? &cert->verify_store : &cert->chain_store;
 432     if (*st == NULL) {
 433         *st = X509_STORE_new();
 434         if (*st == NULL)
 435             return 0;
 436     }
 437     return X509_STORE_load_locations(*st, CAfile, CApath) > 0;
 438 }
 439
 440 static int cmd_ChainCAPath(SSL_CONF_CTX *cctx, const char *value)
 441 {
 442     return do_store(cctx, NULL, value, 0);
 443 }
 444
 445 static int cmd_ChainCAFile(SSL_CONF_CTX *cctx, const char *value)
 446 {
 447     return do_store(cctx, value, NULL, 0);
 448 }
 449
 450 static int cmd_VerifyCAPath(SSL_CONF_CTX *cctx, const char *value)
 451 {
 452     return do_store(cctx, NULL, value, 1);
 453 }
 454
 455 static int cmd_VerifyCAFile(SSL_CONF_CTX *cctx, const char *value)
 456 {
 457     return do_store(cctx, value, NULL, 1);
 458 }
 459
 460 static int cmd_ClientCAFile(SSL_CONF_CTX *cctx, const char *value)
 461 {
 462     if (cctx->canames == NULL)
 463         cctx->canames = sk_X509_NAME_new_null();
 464     if (cctx->canames == NULL)
 465         return 0;
 466     return SSL_add_file_cert_subjects_to_stack(cctx->canames, value);
 467 }
 468
 469 static int cmd_ClientCAPath(SSL_CONF_CTX *cctx, const char *value)
 470 {
 471     if (cctx->canames == NULL)
 472         cctx->canames = sk_X509_NAME_new_null();
 473     if (cctx->canames == NULL)
 474         return 0;
 475     return SSL_add_dir_cert_subjects_to_stack(cctx->canames, value);
 476 }
 477
 478 #ifndef OPENSSL_NO_DH
 479 static int cmd_DHParameters(SSL_CONF_CTX *cctx, const char *value)
 480 {
 481     int rv = 0;
 482     DH *dh = NULL;
 483     BIO *in = NULL;
 484     if (cctx->ctx || cctx->ssl) {
 485         in = BIO_new(BIO_s_file());
 486         if (in == NULL)
 487             goto end;
 488         if (BIO_read_filename(in, value) <= 0)
 489             goto end;
 490         dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL);
 491         if (dh == NULL)
 492             goto end;
 493     } else
 494         return 1;
 495     if (cctx->ctx)
 496         rv = SSL_CTX_set_tmp_dh(cctx->ctx, dh);
 497     if (cctx->ssl)
 498         rv = SSL_set_tmp_dh(cctx->ssl, dh);
 499  end:
 500     DH_free(dh);
 501     BIO_free(in);
 502     return rv > 0;
 503 }
 504 #endif
 505 typedef struct {
 506     int (*cmd) (SSL_CONF_CTX *cctx, const char *value);
 507     const char *str_file;
 508     const char *str_cmdline;
 509     unsigned short flags;
 510     unsigned short value_type;
 511 } ssl_conf_cmd_tbl;
 512
 513 /* Table of supported parameters */
 514
 515 #define SSL_CONF_CMD(name, cmdopt, flags, type) \
 516         {cmd_##name, #name, cmdopt, flags, type}
 517
 518 #define SSL_CONF_CMD_STRING(name, cmdopt, flags) \
 519         SSL_CONF_CMD(name, cmdopt, flags, SSL_CONF_TYPE_STRING)
 520
 521 #define SSL_CONF_CMD_SWITCH(name, flags) \
 522         {0, NULL, name, flags, SSL_CONF_TYPE_NONE}
 523
 524 /* See apps/apps.h if you change this table. */
 525 static const ssl_conf_cmd_tbl ssl_conf_cmds[] = {
 526     SSL_CONF_CMD_SWITCH("no_ssl3", 0),
 527     SSL_CONF_CMD_SWITCH("no_tls1", 0),
 528     SSL_CONF_CMD_SWITCH("no_tls1_1", 0),
 529     SSL_CONF_CMD_SWITCH("no_tls1_2", 0),
 530     SSL_CONF_CMD_SWITCH("bugs", 0),
 531     SSL_CONF_CMD_SWITCH("no_comp", 0),
 532     SSL_CONF_CMD_SWITCH("comp", 0),
 533     SSL_CONF_CMD_SWITCH("ecdh_single", SSL_CONF_FLAG_SERVER),
 534     SSL_CONF_CMD_SWITCH("no_ticket", 0),
 535     SSL_CONF_CMD_SWITCH("serverpref", SSL_CONF_FLAG_SERVER),
 536     SSL_CONF_CMD_SWITCH("legacy_renegotiation", 0),
 537     SSL_CONF_CMD_SWITCH("legacy_server_connect", SSL_CONF_FLAG_SERVER),
 538     SSL_CONF_CMD_SWITCH("no_resumption_on_reneg", SSL_CONF_FLAG_SERVER),
 539     SSL_CONF_CMD_SWITCH("no_legacy_server_connect", SSL_CONF_FLAG_SERVER),
 540     SSL_CONF_CMD_SWITCH("strict", 0),
 541     SSL_CONF_CMD_STRING(SignatureAlgorithms, "sigalgs", 0),
 542     SSL_CONF_CMD_STRING(ClientSignatureAlgorithms, "client_sigalgs", 0),
 543     SSL_CONF_CMD_STRING(Curves, "curves", 0),
 544 #ifndef OPENSSL_NO_EC
 545     SSL_CONF_CMD_STRING(ECDHParameters, "named_curve", SSL_CONF_FLAG_SERVER),
 546 #endif
 547     SSL_CONF_CMD_STRING(CipherString, "cipher", 0),
 548     SSL_CONF_CMD_STRING(Protocol, NULL, 0),
 549     SSL_CONF_CMD_STRING(MinProtocol, "min_protocol", 0),
 550     SSL_CONF_CMD_STRING(MaxProtocol, "max_protocol", 0),
 551     SSL_CONF_CMD_STRING(Options, NULL, 0),
 552     SSL_CONF_CMD_STRING(VerifyMode, NULL, 0),
 553     SSL_CONF_CMD(Certificate, "cert", SSL_CONF_FLAG_CERTIFICATE,
 554                  SSL_CONF_TYPE_FILE),
 555     SSL_CONF_CMD(PrivateKey, "key", SSL_CONF_FLAG_CERTIFICATE,
 556                  SSL_CONF_TYPE_FILE),
 557     SSL_CONF_CMD(ServerInfoFile, NULL,
 558                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 559                  SSL_CONF_TYPE_FILE),
 560     SSL_CONF_CMD(ChainCAPath, "chainCApath", SSL_CONF_FLAG_CERTIFICATE,
 561                  SSL_CONF_TYPE_DIR),
 562     SSL_CONF_CMD(ChainCAFile, "chainCAfile", SSL_CONF_FLAG_CERTIFICATE,
 563                  SSL_CONF_TYPE_FILE),
 564     SSL_CONF_CMD(VerifyCAPath, "verifyCApath", SSL_CONF_FLAG_CERTIFICATE,
 565                  SSL_CONF_TYPE_DIR),
 566     SSL_CONF_CMD(VerifyCAFile, "verifyCAfile", SSL_CONF_FLAG_CERTIFICATE,
 567                  SSL_CONF_TYPE_FILE),
 568     SSL_CONF_CMD(ClientCAFile, NULL,
 569                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 570                  SSL_CONF_TYPE_FILE),
 571     SSL_CONF_CMD(ClientCAPath, NULL,
 572                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 573                  SSL_CONF_TYPE_DIR),
 574 #ifndef OPENSSL_NO_DH
 575     SSL_CONF_CMD(DHParameters, "dhparam",
 576                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 577                  SSL_CONF_TYPE_FILE)
 578 #endif
 579 };
 580
 581 /* Supported switches: must match order of switches in ssl_conf_cmds */
 582 static const ssl_switch_tbl ssl_cmd_switches[] = {
 583     {SSL_OP_NO_SSLv3, 0},       /* no_ssl3 */
 584     {SSL_OP_NO_TLSv1, 0},       /* no_tls1 */
 585     {SSL_OP_NO_TLSv1_1, 0},     /* no_tls1_1 */
 586     {SSL_OP_NO_TLSv1_2, 0},     /* no_tls1_2 */
 587     {SSL_OP_ALL, 0},            /* bugs */
 588     {SSL_OP_NO_COMPRESSION, 0}, /* no_comp */
 589     {SSL_OP_NO_COMPRESSION, SSL_TFLAG_INV}, /* comp */
 590     {SSL_OP_SINGLE_ECDH_USE, 0}, /* ecdh_single */
 591     {SSL_OP_NO_TICKET, 0},      /* no_ticket */
 592     {SSL_OP_CIPHER_SERVER_PREFERENCE, 0}, /* serverpref */
 593     /* legacy_renegotiation */
 594     {SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION, 0},
 595     /* legacy_server_connect */
 596     {SSL_OP_LEGACY_SERVER_CONNECT, 0},
 597     /* no_resumption_on_reneg */
 598     {SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION, 0},
 599     /* no_legacy_server_connect */
 600     {SSL_OP_LEGACY_SERVER_CONNECT, SSL_TFLAG_INV},
 601     {SSL_CERT_FLAG_TLS_STRICT, SSL_TFLAG_CERT}, /* strict */
 602 };
 603
 604 static int ssl_conf_cmd_skip_prefix(SSL_CONF_CTX *cctx, const char **pcmd)
 605 {
 606     if (!pcmd || !*pcmd)
 607         return 0;
 608     /* If a prefix is set, check and skip */
 609     if (cctx->prefix) {
 610         if (strlen(*pcmd) <= cctx->prefixlen)
 611             return 0;
 612         if (cctx->flags & SSL_CONF_FLAG_CMDLINE &&
 613             strncmp(*pcmd, cctx->prefix, cctx->prefixlen))
 614             return 0;
 615         if (cctx->flags & SSL_CONF_FLAG_FILE &&
 616             strncasecmp(*pcmd, cctx->prefix, cctx->prefixlen))
 617             return 0;
 618         *pcmd += cctx->prefixlen;
 619     } else if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
 620         if (**pcmd != '-' || !(*pcmd)[1])
 621             return 0;
 622         *pcmd += 1;
 623     }
 624     return 1;
 625 }
 626
 627 /* Determine if a command is allowed according to cctx flags */
 628 static int ssl_conf_cmd_allowed(SSL_CONF_CTX *cctx,
 629                                 const ssl_conf_cmd_tbl * t)
 630 {
 631     unsigned int tfl = t->flags;
 632     unsigned int cfl = cctx->flags;
 633     if ((tfl & SSL_CONF_FLAG_SERVER) && !(cfl & SSL_CONF_FLAG_SERVER))
 634         return 0;
 635     if ((tfl & SSL_CONF_FLAG_CLIENT) && !(cfl & SSL_CONF_FLAG_CLIENT))
 636         return 0;
 637     if ((tfl & SSL_CONF_FLAG_CERTIFICATE)
 638         && !(cfl & SSL_CONF_FLAG_CERTIFICATE))
 639         return 0;
 640     return 1;
 641 }
 642
 643 static const ssl_conf_cmd_tbl *ssl_conf_cmd_lookup(SSL_CONF_CTX *cctx,
 644                                                    const char *cmd)
 645 {
 646     const ssl_conf_cmd_tbl *t;
 647     size_t i;
 648     if (cmd == NULL)
 649         return NULL;
 650
 651     /* Look for matching parameter name in table */
 652     for (i = 0, t = ssl_conf_cmds; i < OSSL_NELEM(ssl_conf_cmds); i++, t++) {
 653         if (ssl_conf_cmd_allowed(cctx, t)) {
 654             if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
 655                 if (t->str_cmdline && strcmp(t->str_cmdline, cmd) == 0)
 656                     return t;
 657             }
 658             if (cctx->flags & SSL_CONF_FLAG_FILE) {
 659                 if (t->str_file && strcasecmp(t->str_file, cmd) == 0)
 660                     return t;
 661             }
 662         }
 663     }
 664     return NULL;
 665 }
 666
 667 static int ctrl_switch_option(SSL_CONF_CTX *cctx,
 668                               const ssl_conf_cmd_tbl * cmd)
 669 {
 670     /* Find index of command in table */
 671     size_t idx = cmd - ssl_conf_cmds;
 672     const ssl_switch_tbl *scmd;
 673     /* Sanity check index */
 674     if (idx >= OSSL_NELEM(ssl_cmd_switches))
 675         return 0;
 676     /* Obtain switches entry with same index */
 677     scmd = ssl_cmd_switches + idx;
 678     ssl_set_option(cctx, scmd->name_flags, scmd->option_value, 1);
 679     return 1;
 680 }
 681
 682 int SSL_CONF_cmd(SSL_CONF_CTX *cctx, const char *cmd, const char *value)
 683 {
 684     const ssl_conf_cmd_tbl *runcmd;
 685     if (cmd == NULL) {
 686         SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_INVALID_NULL_CMD_NAME);
 687         return 0;
 688     }
 689
 690     if (!ssl_conf_cmd_skip_prefix(cctx, &cmd))
 691         return -2;
 692
 693     runcmd = ssl_conf_cmd_lookup(cctx, cmd);
 694
 695     if (runcmd) {
 696         int rv;
 697         if (runcmd->value_type == SSL_CONF_TYPE_NONE) {
 698             return ctrl_switch_option(cctx, runcmd);
 699         }
 700         if (value == NULL)
 701             return -3;
 702         rv = runcmd->cmd(cctx, value);
 703         if (rv > 0)
 704             return 2;
 705         if (rv == -2)
 706             return -2;
 707         if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS) {
 708             SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_BAD_VALUE);
 709             ERR_add_error_data(4, "cmd=", cmd, ", value=", value);
 710         }
 711         return 0;
 712     }
 713
 714     if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS) {
 715         SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_UNKNOWN_CMD_NAME);
 716         ERR_add_error_data(2, "cmd=", cmd);
 717     }
 718
 719     return -2;
 720 }
 721
 722 int SSL_CONF_cmd_argv(SSL_CONF_CTX *cctx, int *pargc, char ***pargv)
 723 {
 724     int rv;
 725     const char *arg = NULL, *argn;
 726     if (pargc && *pargc == 0)
 727         return 0;
 728     if (!pargc || *pargc > 0)
 729         arg = **pargv;
 730     if (arg == NULL)
 731         return 0;
 732     if (!pargc || *pargc > 1)
 733         argn = (*pargv)[1];
 734     else
 735         argn = NULL;
 736     cctx->flags &= ~SSL_CONF_FLAG_FILE;
 737     cctx->flags |= SSL_CONF_FLAG_CMDLINE;
 738     rv = SSL_CONF_cmd(cctx, arg, argn);
 739     if (rv > 0) {
 740         /* Success: update pargc, pargv */
 741         (*pargv) += rv;
 742         if (pargc)
 743             (*pargc) -= rv;
 744         return rv;
 745     }
 746     /* Unknown switch: indicate no arguments processed */
 747     if (rv == -2)
 748         return 0;
 749     /* Some error occurred processing command, return fatal error */
 750     if (rv == 0)
 751         return -1;
 752     return rv;
 753 }
 754
 755 int SSL_CONF_cmd_value_type(SSL_CONF_CTX *cctx, const char *cmd)
 756 {
 757     if (ssl_conf_cmd_skip_prefix(cctx, &cmd)) {
 758         const ssl_conf_cmd_tbl *runcmd;
 759         runcmd = ssl_conf_cmd_lookup(cctx, cmd);
 760         if (runcmd)
 761             return runcmd->value_type;
 762     }
 763     return SSL_CONF_TYPE_UNKNOWN;
 764 }
 765
 766 SSL_CONF_CTX *SSL_CONF_CTX_new(void)
 767 {
 768     SSL_CONF_CTX *ret = OPENSSL_zalloc(sizeof(*ret));
 769
 770     return ret;
 771 }
 772
 773 int SSL_CONF_CTX_finish(SSL_CONF_CTX *cctx)
 774 {
 775     /* See if any certificates are missing private keys */
 776     size_t i;
 777     CERT *c = NULL;
 778     if (cctx->ctx)
 779         c = cctx->ctx->cert;
 780     else if (cctx->ssl)
 781         c = cctx->ssl->cert;
 782     if (c && cctx->flags & SSL_CONF_FLAG_REQUIRE_PRIVATE) {
 783         for (i = 0; i < SSL_PKEY_NUM; i++) {
 784             const char *p = cctx->cert_filename[i];
 785             /*
 786              * If missing private key try to load one from certificate file
 787              */
 788             if (p && !c->pkeys[i].privatekey) {
 789                 if (!cmd_PrivateKey(cctx, p))
 790                     return 0;
 791             }
 792         }
 793     }
 794     if (cctx->canames) {
 795         if (cctx->ssl)
 796             SSL_set_client_CA_list(cctx->ssl, cctx->canames);
 797         else if (cctx->ctx)
 798             SSL_CTX_set_client_CA_list(cctx->ctx, cctx->canames);
 799         else
 800             sk_X509_NAME_pop_free(cctx->canames, X509_NAME_free);
 801         cctx->canames = NULL;
 802     }
 803     return 1;
 804 }
 805
 806 void SSL_CONF_CTX_free(SSL_CONF_CTX *cctx)
 807 {
 808     if (cctx) {
 809         size_t i;
 810         for (i = 0; i < SSL_PKEY_NUM; i++)
 811             OPENSSL_free(cctx->cert_filename[i]);
 812         OPENSSL_free(cctx->prefix);
 813         sk_X509_NAME_pop_free(cctx->canames, X509_NAME_free);
 814         OPENSSL_free(cctx);
 815     }
 816 }
 817
 818 unsigned int SSL_CONF_CTX_set_flags(SSL_CONF_CTX *cctx, unsigned int flags)
 819 {
 820     cctx->flags |= flags;
 821     return cctx->flags;
 822 }
 823
 824 unsigned int SSL_CONF_CTX_clear_flags(SSL_CONF_CTX *cctx, unsigned int flags)
 825 {
 826     cctx->flags &= ~flags;
 827     return cctx->flags;
 828 }
 829
 830 int SSL_CONF_CTX_set1_prefix(SSL_CONF_CTX *cctx, const char *pre)
 831 {
 832     char *tmp = NULL;
 833     if (pre) {
 834         tmp = OPENSSL_strdup(pre);
 835         if (tmp == NULL)
 836             return 0;
 837     }
 838     OPENSSL_free(cctx->prefix);
 839     cctx->prefix = tmp;
 840     if (tmp)
 841         cctx->prefixlen = strlen(tmp);
 842     else
 843         cctx->prefixlen = 0;
 844     return 1;
 845 }
 846
 847 void SSL_CONF_CTX_set_ssl(SSL_CONF_CTX *cctx, SSL *ssl)
 848 {
 849     cctx->ssl = ssl;
 850     cctx->ctx = NULL;
 851     if (ssl) {
 852         cctx->poptions = &ssl->options;
 853         cctx->min_version = &ssl->min_proto_version;
 854         cctx->max_version = &ssl->max_proto_version;
 855         cctx->pcert_flags = &ssl->cert->cert_flags;
 856         cctx->pvfy_flags = &ssl->verify_mode;
 857     } else {
 858         cctx->poptions = NULL;
 859         cctx->min_version = NULL;
 860         cctx->max_version = NULL;
 861         cctx->pcert_flags = NULL;
 862         cctx->pvfy_flags = NULL;
 863     }
 864 }
 865
 866 void SSL_CONF_CTX_set_ssl_ctx(SSL_CONF_CTX *cctx, SSL_CTX *ctx)
 867 {
 868     cctx->ctx = ctx;
 869     cctx->ssl = NULL;
 870     if (ctx) {
 871         cctx->poptions = &ctx->options;
 872         cctx->min_version = &ctx->min_proto_version;
 873         cctx->max_version = &ctx->max_proto_version;
 874         cctx->pcert_flags = &ctx->cert->cert_flags;
 875         cctx->pvfy_flags = &ctx->verify_mode;
 876     } else {
 877         cctx->poptions = NULL;
 878         cctx->min_version = NULL;
 879         cctx->max_version = NULL;
 880         cctx->pcert_flags = NULL;
 881         cctx->pvfy_flags = NULL;
 882     }
 883 }