ssl/ssl_conf.c

   1 /*
   2  * Copyright 2012-2017 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 #include "internal/nelem.h"
  16
  17 /*
  18  * structure holding name tables. This is used for permitted elements in lists
  19  * such as TLSv1.
  20  */
  21
  22 typedef struct {
  23     const char *name;
  24     int namelen;
  25     unsigned int name_flags;
  26     unsigned long option_value;
  27 } ssl_flag_tbl;
  28
  29 /* Switch table: use for single command line switches like no_tls2 */
  30 typedef struct {
  31     unsigned long option_value;
  32     unsigned int name_flags;
  33 } ssl_switch_tbl;
  34
  35 /* Sense of name is inverted e.g. "TLSv1" will clear SSL_OP_NO_TLSv1 */
  36 #define SSL_TFLAG_INV   0x1
  37 /* Mask for type of flag referred to */
  38 #define SSL_TFLAG_TYPE_MASK 0xf00
  39 /* Flag is for options */
  40 #define SSL_TFLAG_OPTION    0x000
  41 /* Flag is for cert_flags */
  42 #define SSL_TFLAG_CERT      0x100
  43 /* Flag is for verify mode */
  44 #define SSL_TFLAG_VFY       0x200
  45 /* Option can only be used for clients */
  46 #define SSL_TFLAG_CLIENT SSL_CONF_FLAG_CLIENT
  47 /* Option can only be used for servers */
  48 #define SSL_TFLAG_SERVER SSL_CONF_FLAG_SERVER
  49 #define SSL_TFLAG_BOTH (SSL_TFLAG_CLIENT|SSL_TFLAG_SERVER)
  50
  51 #define SSL_FLAG_TBL(str, flag) \
  52         {str, (int)(sizeof(str) - 1), SSL_TFLAG_BOTH, flag}
  53 #define SSL_FLAG_TBL_SRV(str, flag) \
  54         {str, (int)(sizeof(str) - 1), SSL_TFLAG_SERVER, flag}
  55 #define SSL_FLAG_TBL_CLI(str, flag) \
  56         {str, (int)(sizeof(str) - 1), SSL_TFLAG_CLIENT, flag}
  57 #define SSL_FLAG_TBL_INV(str, flag) \
  58         {str, (int)(sizeof(str) - 1), SSL_TFLAG_INV|SSL_TFLAG_BOTH, flag}
  59 #define SSL_FLAG_TBL_SRV_INV(str, flag) \
  60         {str, (int)(sizeof(str) - 1), SSL_TFLAG_INV|SSL_TFLAG_SERVER, flag}
  61 #define SSL_FLAG_TBL_CERT(str, flag) \
  62         {str, (int)(sizeof(str) - 1), SSL_TFLAG_CERT|SSL_TFLAG_BOTH, flag}
  63
  64 #define SSL_FLAG_VFY_CLI(str, flag) \
  65         {str, (int)(sizeof(str) - 1), SSL_TFLAG_VFY | SSL_TFLAG_CLIENT, flag}
  66 #define SSL_FLAG_VFY_SRV(str, flag) \
  67         {str, (int)(sizeof(str) - 1), SSL_TFLAG_VFY | SSL_TFLAG_SERVER, flag}
  68
  69 /*
  70  * Opaque structure containing SSL configuration context.
  71  */
  72
  73 struct ssl_conf_ctx_st {
  74     /*
  75      * Various flags indicating (among other things) which options we will
  76      * recognise.
  77      */
  78     unsigned int flags;
  79     /* Prefix and length of commands */
  80     char *prefix;
  81     size_t prefixlen;
  82     /* SSL_CTX or SSL structure to perform operations on */
  83     SSL_CTX *ctx;
  84     SSL *ssl;
  85     /* Pointer to SSL or SSL_CTX options field or NULL if none */
  86     uint32_t *poptions;
  87     /* Certificate filenames for each type */
  88     char *cert_filename[SSL_PKEY_NUM];
  89     /* Pointer to SSL or SSL_CTX cert_flags or NULL if none */
  90     uint32_t *pcert_flags;
  91     /* Pointer to SSL or SSL_CTX verify_mode or NULL if none */
  92     uint32_t *pvfy_flags;
  93     /* Pointer to SSL or SSL_CTX min_version field or NULL if none */
  94     int *min_version;
  95     /* Pointer to SSL or SSL_CTX max_version field or NULL if none */
  96     int *max_version;
  97     /* Current flag table being worked on */
  98     const ssl_flag_tbl *tbl;
  99     /* Size of table */
 100     size_t ntbl;
 101     /* Client CA names */
 102     STACK_OF(X509_NAME) *canames;
 103 };
 104
 105 static void ssl_set_option(SSL_CONF_CTX *cctx, unsigned int name_flags,
 106                            unsigned long option_value, int onoff)
 107 {
 108     uint32_t *pflags;
 109     if (cctx->poptions == NULL)
 110         return;
 111     if (name_flags & SSL_TFLAG_INV)
 112         onoff ^= 1;
 113     switch (name_flags & SSL_TFLAG_TYPE_MASK) {
 114
 115     case SSL_TFLAG_CERT:
 116         pflags = cctx->pcert_flags;
 117         break;
 118
 119     case SSL_TFLAG_VFY:
 120         pflags = cctx->pvfy_flags;
 121         break;
 122
 123     case SSL_TFLAG_OPTION:
 124         pflags = cctx->poptions;
 125         break;
 126
 127     default:
 128         return;
 129
 130     }
 131     if (onoff)
 132         *pflags |= option_value;
 133     else
 134         *pflags &= ~option_value;
 135 }
 136
 137 static int ssl_match_option(SSL_CONF_CTX *cctx, const ssl_flag_tbl *tbl,
 138                             const char *name, int namelen, int onoff)
 139 {
 140     /* If name not relevant for context skip */
 141     if (!(cctx->flags & tbl->name_flags & SSL_TFLAG_BOTH))
 142         return 0;
 143     if (namelen == -1) {
 144         if (strcmp(tbl->name, name))
 145             return 0;
 146     } else if (tbl->namelen != namelen || 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, const char *value)
 196 {
 197     int rv;
 198     if (cctx->ssl)
 199         rv = SSL_set1_client_sigalgs_list(cctx->ssl, value);
 200     /* NB: ctx == NULL performs syntax checking only */
 201     else
 202         rv = SSL_CTX_set1_client_sigalgs_list(cctx->ctx, value);
 203     return rv > 0;
 204 }
 205
 206 static int cmd_Groups(SSL_CONF_CTX *cctx, const char *value)
 207 {
 208     int rv;
 209     if (cctx->ssl)
 210         rv = SSL_set1_groups_list(cctx->ssl, value);
 211     /* NB: ctx == NULL performs syntax checking only */
 212     else
 213         rv = SSL_CTX_set1_groups_list(cctx->ctx, value);
 214     return rv > 0;
 215 }
 216
 217 /* This is the old name for cmd_Groups - retained for backwards compatibility */
 218 static int cmd_Curves(SSL_CONF_CTX *cctx, const char *value)
 219 {
 220     return cmd_Groups(cctx, value);
 221 }
 222
 223 #ifndef OPENSSL_NO_EC
 224 /* ECDH temporary parameters */
 225 static int cmd_ECDHParameters(SSL_CONF_CTX *cctx, const char *value)
 226 {
 227     int rv = 1;
 228     EC_KEY *ecdh;
 229     int nid;
 230
 231     /* Ignore values supported by 1.0.2 for the automatic selection */
 232     if ((cctx->flags & SSL_CONF_FLAG_FILE) &&
 233         strcasecmp(value, "+automatic") == 0)
 234         return 1;
 235     if ((cctx->flags & SSL_CONF_FLAG_CMDLINE) &&
 236         strcmp(value, "auto") == 0)
 237         return 1;
 238
 239     nid = EC_curve_nist2nid(value);
 240     if (nid == NID_undef)
 241         nid = OBJ_sn2nid(value);
 242     if (nid == 0)
 243         return 0;
 244     ecdh = EC_KEY_new_by_curve_name(nid);
 245     if (!ecdh)
 246         return 0;
 247     if (cctx->ctx)
 248         rv = SSL_CTX_set_tmp_ecdh(cctx->ctx, ecdh);
 249     else if (cctx->ssl)
 250         rv = SSL_set_tmp_ecdh(cctx->ssl, ecdh);
 251     EC_KEY_free(ecdh);
 252
 253     return rv > 0;
 254 }
 255 #endif
 256 static int cmd_CipherString(SSL_CONF_CTX *cctx, const char *value)
 257 {
 258     int rv = 1;
 259     if (cctx->ctx)
 260         rv = SSL_CTX_set_cipher_list(cctx->ctx, value);
 261     if (cctx->ssl)
 262         rv = SSL_set_cipher_list(cctx->ssl, value);
 263     return rv > 0;
 264 }
 265
 266 static int cmd_Protocol(SSL_CONF_CTX *cctx, const char *value)
 267 {
 268     static const ssl_flag_tbl ssl_protocol_list[] = {
 269         SSL_FLAG_TBL_INV("ALL", SSL_OP_NO_SSL_MASK),
 270         SSL_FLAG_TBL_INV("SSLv2", SSL_OP_NO_SSLv2),
 271         SSL_FLAG_TBL_INV("SSLv3", SSL_OP_NO_SSLv3),
 272         SSL_FLAG_TBL_INV("TLSv1", SSL_OP_NO_TLSv1),
 273         SSL_FLAG_TBL_INV("TLSv1.1", SSL_OP_NO_TLSv1_1),
 274         SSL_FLAG_TBL_INV("TLSv1.2", SSL_OP_NO_TLSv1_2),
 275         SSL_FLAG_TBL_INV("TLSv1.3", SSL_OP_NO_TLSv1_3),
 276         SSL_FLAG_TBL_INV("DTLSv1", SSL_OP_NO_DTLSv1),
 277         SSL_FLAG_TBL_INV("DTLSv1.2", SSL_OP_NO_DTLSv1_2)
 278     };
 279     cctx->tbl = ssl_protocol_list;
 280     cctx->ntbl = OSSL_NELEM(ssl_protocol_list);
 281     return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
 282 }
 283
 284 /*
 285  * protocol_from_string - converts a protocol version string to a number
 286  *
 287  * Returns -1 on failure or the version on success
 288  */
 289 static int protocol_from_string(const char *value)
 290 {
 291     struct protocol_versions {
 292         const char *name;
 293         int version;
 294     };
 295     static const struct protocol_versions versions[] = {
 296         {"None", 0},
 297         {"SSLv3", SSL3_VERSION},
 298         {"TLSv1", TLS1_VERSION},
 299         {"TLSv1.1", TLS1_1_VERSION},
 300         {"TLSv1.2", TLS1_2_VERSION},
 301         {"TLSv1.3", TLS1_3_VERSION},
 302         {"DTLSv1", DTLS1_VERSION},
 303         {"DTLSv1.2", DTLS1_2_VERSION}
 304     };
 305     size_t i;
 306     size_t n = OSSL_NELEM(versions);
 307
 308     for (i = 0; i < n; i++)
 309         if (strcmp(versions[i].name, value) == 0)
 310             return versions[i].version;
 311     return -1;
 312 }
 313
 314 static int min_max_proto(SSL_CONF_CTX *cctx, const char *value, int *bound)
 315 {
 316     int method_version;
 317     int new_version;
 318
 319     if (cctx->ctx != NULL)
 320         method_version = cctx->ctx->method->version;
 321     else if (cctx->ssl != NULL)
 322         method_version = cctx->ssl->ctx->method->version;
 323     else
 324         return 0;
 325     if ((new_version = protocol_from_string(value)) < 0)
 326         return 0;
 327     return ssl_set_version_bound(method_version, new_version, bound);
 328 }
 329
 330 /*
 331  * cmd_MinProtocol - Set min protocol version
 332  * @cctx: config structure to save settings in
 333  * @value: The min protocol version in string form
 334  *
 335  * Returns 1 on success and 0 on failure.
 336  */
 337 static int cmd_MinProtocol(SSL_CONF_CTX *cctx, const char *value)
 338 {
 339     return min_max_proto(cctx, value, cctx->min_version);
 340 }
 341
 342 /*
 343  * cmd_MaxProtocol - Set max protocol version
 344  * @cctx: config structure to save settings in
 345  * @value: The max protocol version in string form
 346  *
 347  * Returns 1 on success and 0 on failure.
 348  */
 349 static int cmd_MaxProtocol(SSL_CONF_CTX *cctx, const char *value)
 350 {
 351     return min_max_proto(cctx, value, cctx->max_version);
 352 }
 353
 354 static int cmd_Options(SSL_CONF_CTX *cctx, const char *value)
 355 {
 356     static const ssl_flag_tbl ssl_option_list[] = {
 357         SSL_FLAG_TBL_INV("SessionTicket", SSL_OP_NO_TICKET),
 358         SSL_FLAG_TBL_INV("EmptyFragments",
 359                          SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS),
 360         SSL_FLAG_TBL("Bugs", SSL_OP_ALL),
 361         SSL_FLAG_TBL_INV("Compression", SSL_OP_NO_COMPRESSION),
 362         SSL_FLAG_TBL_SRV("ServerPreference", SSL_OP_CIPHER_SERVER_PREFERENCE),
 363         SSL_FLAG_TBL_SRV("NoResumptionOnRenegotiation",
 364                          SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION),
 365         SSL_FLAG_TBL_SRV("DHSingle", SSL_OP_SINGLE_DH_USE),
 366         SSL_FLAG_TBL_SRV("ECDHSingle", SSL_OP_SINGLE_ECDH_USE),
 367         SSL_FLAG_TBL("UnsafeLegacyRenegotiation",
 368                      SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION),
 369         SSL_FLAG_TBL_INV("EncryptThenMac", SSL_OP_NO_ENCRYPT_THEN_MAC),
 370         SSL_FLAG_TBL("NoRenegotiation", SSL_OP_NO_RENEGOTIATION),
 371         SSL_FLAG_TBL("AllowNoDHEKEX", SSL_OP_ALLOW_NO_DHE_KEX),
 372         SSL_FLAG_TBL("PrioritizeChaCha", SSL_OP_PRIORITIZE_CHACHA),
 373         SSL_FLAG_TBL("MiddleboxCompat", SSL_OP_ENABLE_MIDDLEBOX_COMPAT)
 374     };
 375     if (value == NULL)
 376         return -3;
 377     cctx->tbl = ssl_option_list;
 378     cctx->ntbl = OSSL_NELEM(ssl_option_list);
 379     return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
 380 }
 381
 382 static int cmd_VerifyMode(SSL_CONF_CTX *cctx, const char *value)
 383 {
 384     static const ssl_flag_tbl ssl_vfy_list[] = {
 385         SSL_FLAG_VFY_CLI("Peer", SSL_VERIFY_PEER),
 386         SSL_FLAG_VFY_SRV("Request", SSL_VERIFY_PEER),
 387         SSL_FLAG_VFY_SRV("Require",
 388                          SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT),
 389         SSL_FLAG_VFY_SRV("Once", SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE)
 390     };
 391     if (value == NULL)
 392         return -3;
 393     cctx->tbl = ssl_vfy_list;
 394     cctx->ntbl = OSSL_NELEM(ssl_vfy_list);
 395     return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
 396 }
 397
 398 static int cmd_Certificate(SSL_CONF_CTX *cctx, const char *value)
 399 {
 400     int rv = 1;
 401     CERT *c = NULL;
 402     if (cctx->ctx) {
 403         rv = SSL_CTX_use_certificate_chain_file(cctx->ctx, value);
 404         c = cctx->ctx->cert;
 405     }
 406     if (cctx->ssl) {
 407         rv = SSL_use_certificate_chain_file(cctx->ssl, value);
 408         c = cctx->ssl->cert;
 409     }
 410     if (rv > 0 && c && cctx->flags & SSL_CONF_FLAG_REQUIRE_PRIVATE) {
 411         char **pfilename = &cctx->cert_filename[c->key - c->pkeys];
 412         OPENSSL_free(*pfilename);
 413         *pfilename = OPENSSL_strdup(value);
 414         if (!*pfilename)
 415             rv = 0;
 416     }
 417
 418     return rv > 0;
 419 }
 420
 421 static int cmd_PrivateKey(SSL_CONF_CTX *cctx, const char *value)
 422 {
 423     int rv = 1;
 424     if (!(cctx->flags & SSL_CONF_FLAG_CERTIFICATE))
 425         return -2;
 426     if (cctx->ctx)
 427         rv = SSL_CTX_use_PrivateKey_file(cctx->ctx, value, SSL_FILETYPE_PEM);
 428     if (cctx->ssl)
 429         rv = SSL_use_PrivateKey_file(cctx->ssl, value, SSL_FILETYPE_PEM);
 430     return rv > 0;
 431 }
 432
 433 static int cmd_ServerInfoFile(SSL_CONF_CTX *cctx, const char *value)
 434 {
 435     int rv = 1;
 436     if (cctx->ctx)
 437         rv = SSL_CTX_use_serverinfo_file(cctx->ctx, value);
 438     return rv > 0;
 439 }
 440
 441 static int do_store(SSL_CONF_CTX *cctx,
 442                     const char *CAfile, const char *CApath, int verify_store)
 443 {
 444     CERT *cert;
 445     X509_STORE **st;
 446     if (cctx->ctx)
 447         cert = cctx->ctx->cert;
 448     else if (cctx->ssl)
 449         cert = cctx->ssl->cert;
 450     else
 451         return 1;
 452     st = verify_store ? &cert->verify_store : &cert->chain_store;
 453     if (*st == NULL) {
 454         *st = X509_STORE_new();
 455         if (*st == NULL)
 456             return 0;
 457     }
 458     return X509_STORE_load_locations(*st, CAfile, CApath) > 0;
 459 }
 460
 461 static int cmd_ChainCAPath(SSL_CONF_CTX *cctx, const char *value)
 462 {
 463     return do_store(cctx, NULL, value, 0);
 464 }
 465
 466 static int cmd_ChainCAFile(SSL_CONF_CTX *cctx, const char *value)
 467 {
 468     return do_store(cctx, value, NULL, 0);
 469 }
 470
 471 static int cmd_VerifyCAPath(SSL_CONF_CTX *cctx, const char *value)
 472 {
 473     return do_store(cctx, NULL, value, 1);
 474 }
 475
 476 static int cmd_VerifyCAFile(SSL_CONF_CTX *cctx, const char *value)
 477 {
 478     return do_store(cctx, value, NULL, 1);
 479 }
 480
 481 static int cmd_RequestCAFile(SSL_CONF_CTX *cctx, const char *value)
 482 {
 483     if (cctx->canames == NULL)
 484         cctx->canames = sk_X509_NAME_new_null();
 485     if (cctx->canames == NULL)
 486         return 0;
 487     return SSL_add_file_cert_subjects_to_stack(cctx->canames, value);
 488 }
 489
 490 static int cmd_ClientCAFile(SSL_CONF_CTX *cctx, const char *value)
 491 {
 492     return cmd_RequestCAFile(cctx, value);
 493 }
 494
 495 static int cmd_RequestCAPath(SSL_CONF_CTX *cctx, const char *value)
 496 {
 497     if (cctx->canames == NULL)
 498         cctx->canames = sk_X509_NAME_new_null();
 499     if (cctx->canames == NULL)
 500         return 0;
 501     return SSL_add_dir_cert_subjects_to_stack(cctx->canames, value);
 502 }
 503
 504 static int cmd_ClientCAPath(SSL_CONF_CTX *cctx, const char *value)
 505 {
 506     return cmd_RequestCAPath(cctx, value);
 507 }
 508
 509 #ifndef OPENSSL_NO_DH
 510 static int cmd_DHParameters(SSL_CONF_CTX *cctx, const char *value)
 511 {
 512     int rv = 0;
 513     DH *dh = NULL;
 514     BIO *in = NULL;
 515     if (cctx->ctx || cctx->ssl) {
 516         in = BIO_new(BIO_s_file());
 517         if (in == NULL)
 518             goto end;
 519         if (BIO_read_filename(in, value) <= 0)
 520             goto end;
 521         dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL);
 522         if (dh == NULL)
 523             goto end;
 524     } else
 525         return 1;
 526     if (cctx->ctx)
 527         rv = SSL_CTX_set_tmp_dh(cctx->ctx, dh);
 528     if (cctx->ssl)
 529         rv = SSL_set_tmp_dh(cctx->ssl, dh);
 530  end:
 531     DH_free(dh);
 532     BIO_free(in);
 533     return rv > 0;
 534 }
 535 #endif
 536
 537 static int cmd_RecordPadding(SSL_CONF_CTX *cctx, const char *value)
 538 {
 539     int rv = 0;
 540     int block_size = atoi(value);
 541
 542     /*
 543      * All we care about is a non-negative value,
 544      * the setters check the range
 545      */
 546     if (block_size >= 0) {
 547         if (cctx->ctx)
 548             rv = SSL_CTX_set_block_padding(cctx->ctx, block_size);
 549         if (cctx->ssl)
 550             rv = SSL_set_block_padding(cctx->ssl, block_size);
 551     }
 552     return rv;
 553 }
 554
 555 typedef struct {
 556     int (*cmd) (SSL_CONF_CTX *cctx, const char *value);
 557     const char *str_file;
 558     const char *str_cmdline;
 559     unsigned short flags;
 560     unsigned short value_type;
 561 } ssl_conf_cmd_tbl;
 562
 563 /* Table of supported parameters */
 564
 565 #define SSL_CONF_CMD(name, cmdopt, flags, type) \
 566         {cmd_##name, #name, cmdopt, flags, type}
 567
 568 #define SSL_CONF_CMD_STRING(name, cmdopt, flags) \
 569         SSL_CONF_CMD(name, cmdopt, flags, SSL_CONF_TYPE_STRING)
 570
 571 #define SSL_CONF_CMD_SWITCH(name, flags) \
 572         {0, NULL, name, flags, SSL_CONF_TYPE_NONE}
 573
 574 /* See apps/apps.h if you change this table. */
 575 static const ssl_conf_cmd_tbl ssl_conf_cmds[] = {
 576     SSL_CONF_CMD_SWITCH("no_ssl3", 0),
 577     SSL_CONF_CMD_SWITCH("no_tls1", 0),
 578     SSL_CONF_CMD_SWITCH("no_tls1_1", 0),
 579     SSL_CONF_CMD_SWITCH("no_tls1_2", 0),
 580     SSL_CONF_CMD_SWITCH("no_tls1_3", 0),
 581     SSL_CONF_CMD_SWITCH("bugs", 0),
 582     SSL_CONF_CMD_SWITCH("no_comp", 0),
 583     SSL_CONF_CMD_SWITCH("comp", 0),
 584     SSL_CONF_CMD_SWITCH("ecdh_single", SSL_CONF_FLAG_SERVER),
 585     SSL_CONF_CMD_SWITCH("no_ticket", 0),
 586     SSL_CONF_CMD_SWITCH("serverpref", SSL_CONF_FLAG_SERVER),
 587     SSL_CONF_CMD_SWITCH("legacy_renegotiation", 0),
 588     SSL_CONF_CMD_SWITCH("legacy_server_connect", SSL_CONF_FLAG_SERVER),
 589     SSL_CONF_CMD_SWITCH("no_renegotiation", 0),
 590     SSL_CONF_CMD_SWITCH("no_resumption_on_reneg", SSL_CONF_FLAG_SERVER),
 591     SSL_CONF_CMD_SWITCH("no_legacy_server_connect", SSL_CONF_FLAG_SERVER),
 592     SSL_CONF_CMD_SWITCH("allow_no_dhe_kex", 0),
 593     SSL_CONF_CMD_SWITCH("prioritize_chacha", SSL_CONF_FLAG_SERVER),
 594     SSL_CONF_CMD_SWITCH("strict", 0),
 595     SSL_CONF_CMD_SWITCH("no_middlebox", SSL_CONF_FLAG_CLIENT),
 596     SSL_CONF_CMD_STRING(SignatureAlgorithms, "sigalgs", 0),
 597     SSL_CONF_CMD_STRING(ClientSignatureAlgorithms, "client_sigalgs", 0),
 598     SSL_CONF_CMD_STRING(Curves, "curves", 0),
 599     SSL_CONF_CMD_STRING(Groups, "groups", 0),
 600 #ifndef OPENSSL_NO_EC
 601     SSL_CONF_CMD_STRING(ECDHParameters, "named_curve", SSL_CONF_FLAG_SERVER),
 602 #endif
 603     SSL_CONF_CMD_STRING(CipherString, "cipher", 0),
 604     SSL_CONF_CMD_STRING(Protocol, NULL, 0),
 605     SSL_CONF_CMD_STRING(MinProtocol, "min_protocol", 0),
 606     SSL_CONF_CMD_STRING(MaxProtocol, "max_protocol", 0),
 607     SSL_CONF_CMD_STRING(Options, NULL, 0),
 608     SSL_CONF_CMD_STRING(VerifyMode, NULL, 0),
 609     SSL_CONF_CMD(Certificate, "cert", SSL_CONF_FLAG_CERTIFICATE,
 610                  SSL_CONF_TYPE_FILE),
 611     SSL_CONF_CMD(PrivateKey, "key", SSL_CONF_FLAG_CERTIFICATE,
 612                  SSL_CONF_TYPE_FILE),
 613     SSL_CONF_CMD(ServerInfoFile, NULL,
 614                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 615                  SSL_CONF_TYPE_FILE),
 616     SSL_CONF_CMD(ChainCAPath, "chainCApath", SSL_CONF_FLAG_CERTIFICATE,
 617                  SSL_CONF_TYPE_DIR),
 618     SSL_CONF_CMD(ChainCAFile, "chainCAfile", SSL_CONF_FLAG_CERTIFICATE,
 619                  SSL_CONF_TYPE_FILE),
 620     SSL_CONF_CMD(VerifyCAPath, "verifyCApath", SSL_CONF_FLAG_CERTIFICATE,
 621                  SSL_CONF_TYPE_DIR),
 622     SSL_CONF_CMD(VerifyCAFile, "verifyCAfile", SSL_CONF_FLAG_CERTIFICATE,
 623                  SSL_CONF_TYPE_FILE),
 624     SSL_CONF_CMD(RequestCAFile, "requestCAFile", SSL_CONF_FLAG_CERTIFICATE,
 625                  SSL_CONF_TYPE_FILE),
 626     SSL_CONF_CMD(ClientCAFile, NULL,
 627                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 628                  SSL_CONF_TYPE_FILE),
 629     SSL_CONF_CMD(RequestCAPath, NULL, SSL_CONF_FLAG_CERTIFICATE,
 630                  SSL_CONF_TYPE_DIR),
 631     SSL_CONF_CMD(ClientCAPath, NULL,
 632                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 633                  SSL_CONF_TYPE_DIR),
 634 #ifndef OPENSSL_NO_DH
 635     SSL_CONF_CMD(DHParameters, "dhparam",
 636                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 637                  SSL_CONF_TYPE_FILE),
 638 #endif
 639     SSL_CONF_CMD_STRING(RecordPadding, "record_padding", 0)
 640 };
 641
 642 /* Supported switches: must match order of switches in ssl_conf_cmds */
 643 static const ssl_switch_tbl ssl_cmd_switches[] = {
 644     {SSL_OP_NO_SSLv3, 0},       /* no_ssl3 */
 645     {SSL_OP_NO_TLSv1, 0},       /* no_tls1 */
 646     {SSL_OP_NO_TLSv1_1, 0},     /* no_tls1_1 */
 647     {SSL_OP_NO_TLSv1_2, 0},     /* no_tls1_2 */
 648     {SSL_OP_NO_TLSv1_3, 0},     /* no_tls1_3 */
 649     {SSL_OP_ALL, 0},            /* bugs */
 650     {SSL_OP_NO_COMPRESSION, 0}, /* no_comp */
 651     {SSL_OP_NO_COMPRESSION, SSL_TFLAG_INV}, /* comp */
 652     {SSL_OP_SINGLE_ECDH_USE, 0}, /* ecdh_single */
 653     {SSL_OP_NO_TICKET, 0},      /* no_ticket */
 654     {SSL_OP_CIPHER_SERVER_PREFERENCE, 0}, /* serverpref */
 655     /* legacy_renegotiation */
 656     {SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION, 0},
 657     /* legacy_server_connect */
 658     {SSL_OP_LEGACY_SERVER_CONNECT, 0},
 659     /* no_renegotiation */
 660     {SSL_OP_NO_RENEGOTIATION, 0},
 661     /* no_resumption_on_reneg */
 662     {SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION, 0},
 663     /* no_legacy_server_connect */
 664     {SSL_OP_LEGACY_SERVER_CONNECT, SSL_TFLAG_INV},
 665     /* allow_no_dhe_kex */
 666     {SSL_OP_ALLOW_NO_DHE_KEX, 0},
 667     /* chacha reprioritization */
 668     {SSL_OP_PRIORITIZE_CHACHA, 0},
 669     {SSL_CERT_FLAG_TLS_STRICT, SSL_TFLAG_CERT}, /* strict */
 670     /* no_middlebox */
 671     {SSL_OP_ENABLE_MIDDLEBOX_COMPAT, SSL_TFLAG_INV},
 672 };
 673
 674 static int ssl_conf_cmd_skip_prefix(SSL_CONF_CTX *cctx, const char **pcmd)
 675 {
 676     if (!pcmd || !*pcmd)
 677         return 0;
 678     /* If a prefix is set, check and skip */
 679     if (cctx->prefix) {
 680         if (strlen(*pcmd) <= cctx->prefixlen)
 681             return 0;
 682         if (cctx->flags & SSL_CONF_FLAG_CMDLINE &&
 683             strncmp(*pcmd, cctx->prefix, cctx->prefixlen))
 684             return 0;
 685         if (cctx->flags & SSL_CONF_FLAG_FILE &&
 686             strncasecmp(*pcmd, cctx->prefix, cctx->prefixlen))
 687             return 0;
 688         *pcmd += cctx->prefixlen;
 689     } else if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
 690         if (**pcmd != '-' || !(*pcmd)[1])
 691             return 0;
 692         *pcmd += 1;
 693     }
 694     return 1;
 695 }
 696
 697 /* Determine if a command is allowed according to cctx flags */
 698 static int ssl_conf_cmd_allowed(SSL_CONF_CTX *cctx, const ssl_conf_cmd_tbl * t)
 699 {
 700     unsigned int tfl = t->flags;
 701     unsigned int cfl = cctx->flags;
 702     if ((tfl & SSL_CONF_FLAG_SERVER) && !(cfl & SSL_CONF_FLAG_SERVER))
 703         return 0;
 704     if ((tfl & SSL_CONF_FLAG_CLIENT) && !(cfl & SSL_CONF_FLAG_CLIENT))
 705         return 0;
 706     if ((tfl & SSL_CONF_FLAG_CERTIFICATE)
 707         && !(cfl & SSL_CONF_FLAG_CERTIFICATE))
 708         return 0;
 709     return 1;
 710 }
 711
 712 static const ssl_conf_cmd_tbl *ssl_conf_cmd_lookup(SSL_CONF_CTX *cctx,
 713                                                    const char *cmd)
 714 {
 715     const ssl_conf_cmd_tbl *t;
 716     size_t i;
 717     if (cmd == NULL)
 718         return NULL;
 719
 720     /* Look for matching parameter name in table */
 721     for (i = 0, t = ssl_conf_cmds; i < OSSL_NELEM(ssl_conf_cmds); i++, t++) {
 722         if (ssl_conf_cmd_allowed(cctx, t)) {
 723             if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
 724                 if (t->str_cmdline && strcmp(t->str_cmdline, cmd) == 0)
 725                     return t;
 726             }
 727             if (cctx->flags & SSL_CONF_FLAG_FILE) {
 728                 if (t->str_file && strcasecmp(t->str_file, cmd) == 0)
 729                     return t;
 730             }
 731         }
 732     }
 733     return NULL;
 734 }
 735
 736 static int ctrl_switch_option(SSL_CONF_CTX *cctx, const ssl_conf_cmd_tbl * cmd)
 737 {
 738     /* Find index of command in table */
 739     size_t idx = cmd - ssl_conf_cmds;
 740     const ssl_switch_tbl *scmd;
 741     /* Sanity check index */
 742     if (idx >= OSSL_NELEM(ssl_cmd_switches))
 743         return 0;
 744     /* Obtain switches entry with same index */
 745     scmd = ssl_cmd_switches + idx;
 746     ssl_set_option(cctx, scmd->name_flags, scmd->option_value, 1);
 747     return 1;
 748 }
 749
 750 int SSL_CONF_cmd(SSL_CONF_CTX *cctx, const char *cmd, const char *value)
 751 {
 752     const ssl_conf_cmd_tbl *runcmd;
 753     if (cmd == NULL) {
 754         SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_INVALID_NULL_CMD_NAME);
 755         return 0;
 756     }
 757
 758     if (!ssl_conf_cmd_skip_prefix(cctx, &cmd))
 759         return -2;
 760
 761     runcmd = ssl_conf_cmd_lookup(cctx, cmd);
 762
 763     if (runcmd) {
 764         int rv;
 765         if (runcmd->value_type == SSL_CONF_TYPE_NONE) {
 766             return ctrl_switch_option(cctx, runcmd);
 767         }
 768         if (value == NULL)
 769             return -3;
 770         rv = runcmd->cmd(cctx, value);
 771         if (rv > 0)
 772             return 2;
 773         if (rv == -2)
 774             return -2;
 775         if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS) {
 776             SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_BAD_VALUE);
 777             ERR_add_error_data(4, "cmd=", cmd, ", value=", value);
 778         }
 779         return 0;
 780     }
 781
 782     if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS) {
 783         SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_UNKNOWN_CMD_NAME);
 784         ERR_add_error_data(2, "cmd=", cmd);
 785     }
 786
 787     return -2;
 788 }
 789
 790 int SSL_CONF_cmd_argv(SSL_CONF_CTX *cctx, int *pargc, char ***pargv)
 791 {
 792     int rv;
 793     const char *arg = NULL, *argn;
 794     if (pargc && *pargc == 0)
 795         return 0;
 796     if (!pargc || *pargc > 0)
 797         arg = **pargv;
 798     if (arg == NULL)
 799         return 0;
 800     if (!pargc || *pargc > 1)
 801         argn = (*pargv)[1];
 802     else
 803         argn = NULL;
 804     cctx->flags &= ~SSL_CONF_FLAG_FILE;
 805     cctx->flags |= SSL_CONF_FLAG_CMDLINE;
 806     rv = SSL_CONF_cmd(cctx, arg, argn);
 807     if (rv > 0) {
 808         /* Success: update pargc, pargv */
 809         (*pargv) += rv;
 810         if (pargc)
 811             (*pargc) -= rv;
 812         return rv;
 813     }
 814     /* Unknown switch: indicate no arguments processed */
 815     if (rv == -2)
 816         return 0;
 817     /* Some error occurred processing command, return fatal error */
 818     if (rv == 0)
 819         return -1;
 820     return rv;
 821 }
 822
 823 int SSL_CONF_cmd_value_type(SSL_CONF_CTX *cctx, const char *cmd)
 824 {
 825     if (ssl_conf_cmd_skip_prefix(cctx, &cmd)) {
 826         const ssl_conf_cmd_tbl *runcmd;
 827         runcmd = ssl_conf_cmd_lookup(cctx, cmd);
 828         if (runcmd)
 829             return runcmd->value_type;
 830     }
 831     return SSL_CONF_TYPE_UNKNOWN;
 832 }
 833
 834 SSL_CONF_CTX *SSL_CONF_CTX_new(void)
 835 {
 836     SSL_CONF_CTX *ret = OPENSSL_zalloc(sizeof(*ret));
 837
 838     return ret;
 839 }
 840
 841 int SSL_CONF_CTX_finish(SSL_CONF_CTX *cctx)
 842 {
 843     /* See if any certificates are missing private keys */
 844     size_t i;
 845     CERT *c = NULL;
 846     if (cctx->ctx)
 847         c = cctx->ctx->cert;
 848     else if (cctx->ssl)
 849         c = cctx->ssl->cert;
 850     if (c && cctx->flags & SSL_CONF_FLAG_REQUIRE_PRIVATE) {
 851         for (i = 0; i < SSL_PKEY_NUM; i++) {
 852             const char *p = cctx->cert_filename[i];
 853             /*
 854              * If missing private key try to load one from certificate file
 855              */
 856             if (p && !c->pkeys[i].privatekey) {
 857                 if (!cmd_PrivateKey(cctx, p))
 858                     return 0;
 859             }
 860         }
 861     }
 862     if (cctx->canames) {
 863         if (cctx->ssl)
 864             SSL_set0_CA_list(cctx->ssl, cctx->canames);
 865         else if (cctx->ctx)
 866             SSL_CTX_set0_CA_list(cctx->ctx, cctx->canames);
 867         else
 868             sk_X509_NAME_pop_free(cctx->canames, X509_NAME_free);
 869         cctx->canames = NULL;
 870     }
 871     return 1;
 872 }
 873
 874 void SSL_CONF_CTX_free(SSL_CONF_CTX *cctx)
 875 {
 876     if (cctx) {
 877         size_t i;
 878         for (i = 0; i < SSL_PKEY_NUM; i++)
 879             OPENSSL_free(cctx->cert_filename[i]);
 880         OPENSSL_free(cctx->prefix);
 881         sk_X509_NAME_pop_free(cctx->canames, X509_NAME_free);
 882         OPENSSL_free(cctx);
 883     }
 884 }
 885
 886 unsigned int SSL_CONF_CTX_set_flags(SSL_CONF_CTX *cctx, unsigned int flags)
 887 {
 888     cctx->flags |= flags;
 889     return cctx->flags;
 890 }
 891
 892 unsigned int SSL_CONF_CTX_clear_flags(SSL_CONF_CTX *cctx, unsigned int flags)
 893 {
 894     cctx->flags &= ~flags;
 895     return cctx->flags;
 896 }
 897
 898 int SSL_CONF_CTX_set1_prefix(SSL_CONF_CTX *cctx, const char *pre)
 899 {
 900     char *tmp = NULL;
 901     if (pre) {
 902         tmp = OPENSSL_strdup(pre);
 903         if (tmp == NULL)
 904             return 0;
 905     }
 906     OPENSSL_free(cctx->prefix);
 907     cctx->prefix = tmp;
 908     if (tmp)
 909         cctx->prefixlen = strlen(tmp);
 910     else
 911         cctx->prefixlen = 0;
 912     return 1;
 913 }
 914
 915 void SSL_CONF_CTX_set_ssl(SSL_CONF_CTX *cctx, SSL *ssl)
 916 {
 917     cctx->ssl = ssl;
 918     cctx->ctx = NULL;
 919     if (ssl) {
 920         cctx->poptions = &ssl->options;
 921         cctx->min_version = &ssl->min_proto_version;
 922         cctx->max_version = &ssl->max_proto_version;
 923         cctx->pcert_flags = &ssl->cert->cert_flags;
 924         cctx->pvfy_flags = &ssl->verify_mode;
 925     } else {
 926         cctx->poptions = NULL;
 927         cctx->min_version = NULL;
 928         cctx->max_version = NULL;
 929         cctx->pcert_flags = NULL;
 930         cctx->pvfy_flags = NULL;
 931     }
 932 }
 933
 934 void SSL_CONF_CTX_set_ssl_ctx(SSL_CONF_CTX *cctx, SSL_CTX *ctx)
 935 {
 936     cctx->ctx = ctx;
 937     cctx->ssl = NULL;
 938     if (ctx) {
 939         cctx->poptions = &ctx->options;
 940         cctx->min_version = &ctx->min_proto_version;
 941         cctx->max_version = &ctx->max_proto_version;
 942         cctx->pcert_flags = &ctx->cert->cert_flags;
 943         cctx->pvfy_flags = &ctx->verify_mode;
 944     } else {
 945         cctx->poptions = NULL;
 946         cctx->min_version = NULL;
 947         cctx->max_version = NULL;
 948         cctx->pcert_flags = NULL;
 949         cctx->pvfy_flags = NULL;
 950     }
 951 }