ssl/ssl_conf.c

   1 /*
   2  * Copyright 2012-2018 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (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_local.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     int nid;
 229
 230     /* Ignore values supported by 1.0.2 for the automatic selection */
 231     if ((cctx->flags & SSL_CONF_FLAG_FILE)
 232             && (strcasecmp(value, "+automatic") == 0
 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
 245     if (cctx->ctx)
 246         rv = SSL_CTX_set1_groups(cctx->ctx, &nid, 1);
 247     else if (cctx->ssl)
 248         rv = SSL_set1_groups(cctx->ssl, &nid, 1);
 249
 250     return rv > 0;
 251 }
 252 #endif
 253 static int cmd_CipherString(SSL_CONF_CTX *cctx, const char *value)
 254 {
 255     int rv = 1;
 256
 257     if (cctx->ctx)
 258         rv = SSL_CTX_set_cipher_list(cctx->ctx, value);
 259     if (cctx->ssl)
 260         rv = SSL_set_cipher_list(cctx->ssl, value);
 261     return rv > 0;
 262 }
 263
 264 static int cmd_Ciphersuites(SSL_CONF_CTX *cctx, const char *value)
 265 {
 266     int rv = 1;
 267
 268     if (cctx->ctx)
 269         rv = SSL_CTX_set_ciphersuites(cctx->ctx, value);
 270     if (cctx->ssl)
 271         rv = SSL_set_ciphersuites(cctx->ssl, value);
 272     return rv > 0;
 273 }
 274
 275 static int cmd_Protocol(SSL_CONF_CTX *cctx, const char *value)
 276 {
 277     static const ssl_flag_tbl ssl_protocol_list[] = {
 278         SSL_FLAG_TBL_INV("ALL", SSL_OP_NO_SSL_MASK),
 279         SSL_FLAG_TBL_INV("SSLv2", SSL_OP_NO_SSLv2),
 280         SSL_FLAG_TBL_INV("SSLv3", SSL_OP_NO_SSLv3),
 281         SSL_FLAG_TBL_INV("TLSv1", SSL_OP_NO_TLSv1),
 282         SSL_FLAG_TBL_INV("TLSv1.1", SSL_OP_NO_TLSv1_1),
 283         SSL_FLAG_TBL_INV("TLSv1.2", SSL_OP_NO_TLSv1_2),
 284         SSL_FLAG_TBL_INV("TLSv1.3", SSL_OP_NO_TLSv1_3),
 285         SSL_FLAG_TBL_INV("DTLSv1", SSL_OP_NO_DTLSv1),
 286         SSL_FLAG_TBL_INV("DTLSv1.2", SSL_OP_NO_DTLSv1_2)
 287     };
 288     cctx->tbl = ssl_protocol_list;
 289     cctx->ntbl = OSSL_NELEM(ssl_protocol_list);
 290     return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
 291 }
 292
 293 /*
 294  * protocol_from_string - converts a protocol version string to a number
 295  *
 296  * Returns -1 on failure or the version on success
 297  */
 298 static int protocol_from_string(const char *value)
 299 {
 300     struct protocol_versions {
 301         const char *name;
 302         int version;
 303     };
 304     static const struct protocol_versions versions[] = {
 305         {"None", 0},
 306         {"SSLv3", SSL3_VERSION},
 307         {"TLSv1", TLS1_VERSION},
 308         {"TLSv1.1", TLS1_1_VERSION},
 309         {"TLSv1.2", TLS1_2_VERSION},
 310         {"TLSv1.3", TLS1_3_VERSION},
 311         {"DTLSv1", DTLS1_VERSION},
 312         {"DTLSv1.2", DTLS1_2_VERSION}
 313     };
 314     size_t i;
 315     size_t n = OSSL_NELEM(versions);
 316
 317     for (i = 0; i < n; i++)
 318         if (strcmp(versions[i].name, value) == 0)
 319             return versions[i].version;
 320     return -1;
 321 }
 322
 323 static int min_max_proto(SSL_CONF_CTX *cctx, const char *value, int *bound)
 324 {
 325     int method_version;
 326     int new_version;
 327
 328     if (cctx->ctx != NULL)
 329         method_version = cctx->ctx->method->version;
 330     else if (cctx->ssl != NULL)
 331         method_version = cctx->ssl->ctx->method->version;
 332     else
 333         return 0;
 334     if ((new_version = protocol_from_string(value)) < 0)
 335         return 0;
 336     return ssl_set_version_bound(method_version, new_version, bound);
 337 }
 338
 339 /*
 340  * cmd_MinProtocol - Set min protocol version
 341  * @cctx: config structure to save settings in
 342  * @value: The min protocol version in string form
 343  *
 344  * Returns 1 on success and 0 on failure.
 345  */
 346 static int cmd_MinProtocol(SSL_CONF_CTX *cctx, const char *value)
 347 {
 348     return min_max_proto(cctx, value, cctx->min_version);
 349 }
 350
 351 /*
 352  * cmd_MaxProtocol - Set max protocol version
 353  * @cctx: config structure to save settings in
 354  * @value: The max protocol version in string form
 355  *
 356  * Returns 1 on success and 0 on failure.
 357  */
 358 static int cmd_MaxProtocol(SSL_CONF_CTX *cctx, const char *value)
 359 {
 360     return min_max_proto(cctx, value, cctx->max_version);
 361 }
 362
 363 static int cmd_Options(SSL_CONF_CTX *cctx, const char *value)
 364 {
 365     static const ssl_flag_tbl ssl_option_list[] = {
 366         SSL_FLAG_TBL_INV("SessionTicket", SSL_OP_NO_TICKET),
 367         SSL_FLAG_TBL_INV("EmptyFragments",
 368                          SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS),
 369         SSL_FLAG_TBL("Bugs", SSL_OP_ALL),
 370         SSL_FLAG_TBL_INV("Compression", SSL_OP_NO_COMPRESSION),
 371         SSL_FLAG_TBL_SRV("ServerPreference", SSL_OP_CIPHER_SERVER_PREFERENCE),
 372         SSL_FLAG_TBL_SRV("NoResumptionOnRenegotiation",
 373                          SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION),
 374         SSL_FLAG_TBL_SRV("DHSingle", SSL_OP_SINGLE_DH_USE),
 375         SSL_FLAG_TBL_SRV("ECDHSingle", SSL_OP_SINGLE_ECDH_USE),
 376         SSL_FLAG_TBL("UnsafeLegacyRenegotiation",
 377                      SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION),
 378         SSL_FLAG_TBL_INV("EncryptThenMac", SSL_OP_NO_ENCRYPT_THEN_MAC),
 379         SSL_FLAG_TBL("NoRenegotiation", SSL_OP_NO_RENEGOTIATION),
 380         SSL_FLAG_TBL("AllowNoDHEKEX", SSL_OP_ALLOW_NO_DHE_KEX),
 381         SSL_FLAG_TBL("PrioritizeChaCha", SSL_OP_PRIORITIZE_CHACHA),
 382         SSL_FLAG_TBL("MiddleboxCompat", SSL_OP_ENABLE_MIDDLEBOX_COMPAT),
 383         SSL_FLAG_TBL_INV("AntiReplay", SSL_OP_NO_ANTI_REPLAY),
 384         SSL_FLAG_TBL_INV("ExtendedMasterSecret", SSL_OP_NO_EXTENDED_MASTER_SECRET)
 385     };
 386     if (value == NULL)
 387         return -3;
 388     cctx->tbl = ssl_option_list;
 389     cctx->ntbl = OSSL_NELEM(ssl_option_list);
 390     return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
 391 }
 392
 393 static int cmd_VerifyMode(SSL_CONF_CTX *cctx, const char *value)
 394 {
 395     static const ssl_flag_tbl ssl_vfy_list[] = {
 396         SSL_FLAG_VFY_CLI("Peer", SSL_VERIFY_PEER),
 397         SSL_FLAG_VFY_SRV("Request", SSL_VERIFY_PEER),
 398         SSL_FLAG_VFY_SRV("Require",
 399                          SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT),
 400         SSL_FLAG_VFY_SRV("Once", SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE),
 401         SSL_FLAG_VFY_SRV("RequestPostHandshake",
 402                          SSL_VERIFY_PEER | SSL_VERIFY_POST_HANDSHAKE),
 403         SSL_FLAG_VFY_SRV("RequirePostHandshake",
 404                          SSL_VERIFY_PEER | SSL_VERIFY_POST_HANDSHAKE |
 405                          SSL_VERIFY_FAIL_IF_NO_PEER_CERT),
 406     };
 407     if (value == NULL)
 408         return -3;
 409     cctx->tbl = ssl_vfy_list;
 410     cctx->ntbl = OSSL_NELEM(ssl_vfy_list);
 411     return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
 412 }
 413
 414 static int cmd_Certificate(SSL_CONF_CTX *cctx, const char *value)
 415 {
 416     int rv = 1;
 417     CERT *c = NULL;
 418     if (cctx->ctx) {
 419         rv = SSL_CTX_use_certificate_chain_file(cctx->ctx, value);
 420         c = cctx->ctx->cert;
 421     }
 422     if (cctx->ssl) {
 423         rv = SSL_use_certificate_chain_file(cctx->ssl, value);
 424         c = cctx->ssl->cert;
 425     }
 426     if (rv > 0 && c && cctx->flags & SSL_CONF_FLAG_REQUIRE_PRIVATE) {
 427         char **pfilename = &cctx->cert_filename[c->key - c->pkeys];
 428         OPENSSL_free(*pfilename);
 429         *pfilename = OPENSSL_strdup(value);
 430         if (*pfilename == NULL)
 431             rv = 0;
 432     }
 433
 434     return rv > 0;
 435 }
 436
 437 static int cmd_PrivateKey(SSL_CONF_CTX *cctx, const char *value)
 438 {
 439     int rv = 1;
 440     if (!(cctx->flags & SSL_CONF_FLAG_CERTIFICATE))
 441         return -2;
 442     if (cctx->ctx)
 443         rv = SSL_CTX_use_PrivateKey_file(cctx->ctx, value, SSL_FILETYPE_PEM);
 444     if (cctx->ssl)
 445         rv = SSL_use_PrivateKey_file(cctx->ssl, value, SSL_FILETYPE_PEM);
 446     return rv > 0;
 447 }
 448
 449 static int cmd_ServerInfoFile(SSL_CONF_CTX *cctx, const char *value)
 450 {
 451     int rv = 1;
 452     if (cctx->ctx)
 453         rv = SSL_CTX_use_serverinfo_file(cctx->ctx, value);
 454     return rv > 0;
 455 }
 456
 457 static int do_store(SSL_CONF_CTX *cctx,
 458                     const char *CAfile, const char *CApath, const char *CAstore,
 459                     int verify_store)
 460 {
 461     CERT *cert;
 462     X509_STORE **st;
 463
 464     if (cctx->ctx)
 465         cert = cctx->ctx->cert;
 466     else if (cctx->ssl)
 467         cert = cctx->ssl->cert;
 468     else
 469         return 1;
 470     st = verify_store ? &cert->verify_store : &cert->chain_store;
 471     if (*st == NULL) {
 472         *st = X509_STORE_new();
 473         if (*st == NULL)
 474             return 0;
 475     }
 476
 477     if (CAfile != NULL && !X509_STORE_load_file(*st, CAfile))
 478         return 0;
 479     if (CApath != NULL && !X509_STORE_load_path(*st, CApath))
 480         return 0;
 481     if (CAstore != NULL && !X509_STORE_load_store(*st, CAstore))
 482         return 0;
 483     return 1;
 484 }
 485
 486 static int cmd_ChainCAPath(SSL_CONF_CTX *cctx, const char *value)
 487 {
 488     return do_store(cctx, NULL, value, NULL, 0);
 489 }
 490
 491 static int cmd_ChainCAFile(SSL_CONF_CTX *cctx, const char *value)
 492 {
 493     return do_store(cctx, value, NULL, NULL, 0);
 494 }
 495
 496 static int cmd_ChainCAStore(SSL_CONF_CTX *cctx, const char *value)
 497 {
 498     return do_store(cctx, NULL, NULL, value, 0);
 499 }
 500
 501 static int cmd_VerifyCAPath(SSL_CONF_CTX *cctx, const char *value)
 502 {
 503     return do_store(cctx, NULL, value, NULL, 1);
 504 }
 505
 506 static int cmd_VerifyCAFile(SSL_CONF_CTX *cctx, const char *value)
 507 {
 508     return do_store(cctx, value, NULL, NULL, 1);
 509 }
 510
 511 static int cmd_VerifyCAStore(SSL_CONF_CTX *cctx, const char *value)
 512 {
 513     return do_store(cctx, NULL, NULL, value, 1);
 514 }
 515
 516 static int cmd_RequestCAFile(SSL_CONF_CTX *cctx, const char *value)
 517 {
 518     if (cctx->canames == NULL)
 519         cctx->canames = sk_X509_NAME_new_null();
 520     if (cctx->canames == NULL)
 521         return 0;
 522     return SSL_add_file_cert_subjects_to_stack(cctx->canames, value);
 523 }
 524
 525 static int cmd_ClientCAFile(SSL_CONF_CTX *cctx, const char *value)
 526 {
 527     return cmd_RequestCAFile(cctx, value);
 528 }
 529
 530 static int cmd_RequestCAPath(SSL_CONF_CTX *cctx, const char *value)
 531 {
 532     if (cctx->canames == NULL)
 533         cctx->canames = sk_X509_NAME_new_null();
 534     if (cctx->canames == NULL)
 535         return 0;
 536     return SSL_add_dir_cert_subjects_to_stack(cctx->canames, value);
 537 }
 538
 539 static int cmd_ClientCAPath(SSL_CONF_CTX *cctx, const char *value)
 540 {
 541     return cmd_RequestCAPath(cctx, value);
 542 }
 543
 544 static int cmd_RequestCAStore(SSL_CONF_CTX *cctx, const char *value)
 545 {
 546     if (cctx->canames == NULL)
 547         cctx->canames = sk_X509_NAME_new_null();
 548     if (cctx->canames == NULL)
 549         return 0;
 550     return SSL_add_store_cert_subjects_to_stack(cctx->canames, value);
 551 }
 552
 553 static int cmd_ClientCAStore(SSL_CONF_CTX *cctx, const char *value)
 554 {
 555     return cmd_RequestCAStore(cctx, value);
 556 }
 557
 558 #ifndef OPENSSL_NO_DH
 559 static int cmd_DHParameters(SSL_CONF_CTX *cctx, const char *value)
 560 {
 561     int rv = 0;
 562     DH *dh = NULL;
 563     BIO *in = NULL;
 564     if (cctx->ctx || cctx->ssl) {
 565         in = BIO_new(BIO_s_file());
 566         if (in == NULL)
 567             goto end;
 568         if (BIO_read_filename(in, value) <= 0)
 569             goto end;
 570         dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL);
 571         if (dh == NULL)
 572             goto end;
 573     } else
 574         return 1;
 575     if (cctx->ctx)
 576         rv = SSL_CTX_set_tmp_dh(cctx->ctx, dh);
 577     if (cctx->ssl)
 578         rv = SSL_set_tmp_dh(cctx->ssl, dh);
 579  end:
 580     DH_free(dh);
 581     BIO_free(in);
 582     return rv > 0;
 583 }
 584 #endif
 585
 586 static int cmd_RecordPadding(SSL_CONF_CTX *cctx, const char *value)
 587 {
 588     int rv = 0;
 589     int block_size = atoi(value);
 590
 591     /*
 592      * All we care about is a non-negative value,
 593      * the setters check the range
 594      */
 595     if (block_size >= 0) {
 596         if (cctx->ctx)
 597             rv = SSL_CTX_set_block_padding(cctx->ctx, block_size);
 598         if (cctx->ssl)
 599             rv = SSL_set_block_padding(cctx->ssl, block_size);
 600     }
 601     return rv;
 602 }
 603
 604
 605 static int cmd_NumTickets(SSL_CONF_CTX *cctx, const char *value)
 606 {
 607     int rv = 0;
 608     int num_tickets = atoi(value);
 609
 610     if (num_tickets >= 0) {
 611         if (cctx->ctx)
 612             rv = SSL_CTX_set_num_tickets(cctx->ctx, num_tickets);
 613         if (cctx->ssl)
 614             rv = SSL_set_num_tickets(cctx->ssl, num_tickets);
 615     }
 616     return rv;
 617 }
 618
 619 typedef struct {
 620     int (*cmd) (SSL_CONF_CTX *cctx, const char *value);
 621     const char *str_file;
 622     const char *str_cmdline;
 623     unsigned short flags;
 624     unsigned short value_type;
 625 } ssl_conf_cmd_tbl;
 626
 627 /* Table of supported parameters */
 628
 629 #define SSL_CONF_CMD(name, cmdopt, flags, type) \
 630         {cmd_##name, #name, cmdopt, flags, type}
 631
 632 #define SSL_CONF_CMD_STRING(name, cmdopt, flags) \
 633         SSL_CONF_CMD(name, cmdopt, flags, SSL_CONF_TYPE_STRING)
 634
 635 #define SSL_CONF_CMD_SWITCH(name, flags) \
 636         {0, NULL, name, flags, SSL_CONF_TYPE_NONE}
 637
 638 /* See apps/apps.h if you change this table. */
 639 static const ssl_conf_cmd_tbl ssl_conf_cmds[] = {
 640     SSL_CONF_CMD_SWITCH("no_ssl3", 0),
 641     SSL_CONF_CMD_SWITCH("no_tls1", 0),
 642     SSL_CONF_CMD_SWITCH("no_tls1_1", 0),
 643     SSL_CONF_CMD_SWITCH("no_tls1_2", 0),
 644     SSL_CONF_CMD_SWITCH("no_tls1_3", 0),
 645     SSL_CONF_CMD_SWITCH("bugs", 0),
 646     SSL_CONF_CMD_SWITCH("no_comp", 0),
 647     SSL_CONF_CMD_SWITCH("comp", 0),
 648     SSL_CONF_CMD_SWITCH("ecdh_single", SSL_CONF_FLAG_SERVER),
 649     SSL_CONF_CMD_SWITCH("no_ticket", 0),
 650     SSL_CONF_CMD_SWITCH("serverpref", SSL_CONF_FLAG_SERVER),
 651     SSL_CONF_CMD_SWITCH("legacy_renegotiation", 0),
 652     SSL_CONF_CMD_SWITCH("legacy_server_connect", SSL_CONF_FLAG_SERVER),
 653     SSL_CONF_CMD_SWITCH("no_renegotiation", 0),
 654     SSL_CONF_CMD_SWITCH("no_resumption_on_reneg", SSL_CONF_FLAG_SERVER),
 655     SSL_CONF_CMD_SWITCH("no_legacy_server_connect", SSL_CONF_FLAG_SERVER),
 656     SSL_CONF_CMD_SWITCH("allow_no_dhe_kex", 0),
 657     SSL_CONF_CMD_SWITCH("prioritize_chacha", SSL_CONF_FLAG_SERVER),
 658     SSL_CONF_CMD_SWITCH("strict", 0),
 659     SSL_CONF_CMD_SWITCH("no_middlebox", 0),
 660     SSL_CONF_CMD_SWITCH("anti_replay", SSL_CONF_FLAG_SERVER),
 661     SSL_CONF_CMD_SWITCH("no_anti_replay", SSL_CONF_FLAG_SERVER),
 662     SSL_CONF_CMD_STRING(SignatureAlgorithms, "sigalgs", 0),
 663     SSL_CONF_CMD_STRING(ClientSignatureAlgorithms, "client_sigalgs", 0),
 664     SSL_CONF_CMD_STRING(Curves, "curves", 0),
 665     SSL_CONF_CMD_STRING(Groups, "groups", 0),
 666 #ifndef OPENSSL_NO_EC
 667     SSL_CONF_CMD_STRING(ECDHParameters, "named_curve", SSL_CONF_FLAG_SERVER),
 668 #endif
 669     SSL_CONF_CMD_STRING(CipherString, "cipher", 0),
 670     SSL_CONF_CMD_STRING(Ciphersuites, "ciphersuites", 0),
 671     SSL_CONF_CMD_STRING(Protocol, NULL, 0),
 672     SSL_CONF_CMD_STRING(MinProtocol, "min_protocol", 0),
 673     SSL_CONF_CMD_STRING(MaxProtocol, "max_protocol", 0),
 674     SSL_CONF_CMD_STRING(Options, NULL, 0),
 675     SSL_CONF_CMD_STRING(VerifyMode, NULL, 0),
 676     SSL_CONF_CMD(Certificate, "cert", SSL_CONF_FLAG_CERTIFICATE,
 677                  SSL_CONF_TYPE_FILE),
 678     SSL_CONF_CMD(PrivateKey, "key", SSL_CONF_FLAG_CERTIFICATE,
 679                  SSL_CONF_TYPE_FILE),
 680     SSL_CONF_CMD(ServerInfoFile, NULL,
 681                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 682                  SSL_CONF_TYPE_FILE),
 683     SSL_CONF_CMD(ChainCAPath, "chainCApath", SSL_CONF_FLAG_CERTIFICATE,
 684                  SSL_CONF_TYPE_DIR),
 685     SSL_CONF_CMD(ChainCAFile, "chainCAfile", SSL_CONF_FLAG_CERTIFICATE,
 686                  SSL_CONF_TYPE_FILE),
 687     SSL_CONF_CMD(ChainCAStore, "chainCAstore", SSL_CONF_FLAG_CERTIFICATE,
 688                  SSL_CONF_TYPE_STORE),
 689     SSL_CONF_CMD(VerifyCAPath, "verifyCApath", SSL_CONF_FLAG_CERTIFICATE,
 690                  SSL_CONF_TYPE_DIR),
 691     SSL_CONF_CMD(VerifyCAFile, "verifyCAfile", SSL_CONF_FLAG_CERTIFICATE,
 692                  SSL_CONF_TYPE_FILE),
 693     SSL_CONF_CMD(VerifyCAStore, "verifyCAstore", SSL_CONF_FLAG_CERTIFICATE,
 694                  SSL_CONF_TYPE_STORE),
 695     SSL_CONF_CMD(RequestCAFile, "requestCAFile", SSL_CONF_FLAG_CERTIFICATE,
 696                  SSL_CONF_TYPE_FILE),
 697     SSL_CONF_CMD(ClientCAFile, NULL,
 698                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 699                  SSL_CONF_TYPE_FILE),
 700     SSL_CONF_CMD(RequestCAPath, NULL, SSL_CONF_FLAG_CERTIFICATE,
 701                  SSL_CONF_TYPE_DIR),
 702     SSL_CONF_CMD(ClientCAPath, NULL,
 703                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 704                  SSL_CONF_TYPE_DIR),
 705     SSL_CONF_CMD(RequestCAStore, "requestCAStore", SSL_CONF_FLAG_CERTIFICATE,
 706                  SSL_CONF_TYPE_STORE),
 707     SSL_CONF_CMD(ClientCAStore, NULL,
 708                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 709                  SSL_CONF_TYPE_STORE),
 710 #ifndef OPENSSL_NO_DH
 711     SSL_CONF_CMD(DHParameters, "dhparam",
 712                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 713                  SSL_CONF_TYPE_FILE),
 714 #endif
 715     SSL_CONF_CMD_STRING(RecordPadding, "record_padding", 0),
 716     SSL_CONF_CMD_STRING(NumTickets, "num_tickets", SSL_CONF_FLAG_SERVER),
 717 };
 718
 719 /* Supported switches: must match order of switches in ssl_conf_cmds */
 720 static const ssl_switch_tbl ssl_cmd_switches[] = {
 721     {SSL_OP_NO_SSLv3, 0},       /* no_ssl3 */
 722     {SSL_OP_NO_TLSv1, 0},       /* no_tls1 */
 723     {SSL_OP_NO_TLSv1_1, 0},     /* no_tls1_1 */
 724     {SSL_OP_NO_TLSv1_2, 0},     /* no_tls1_2 */
 725     {SSL_OP_NO_TLSv1_3, 0},     /* no_tls1_3 */
 726     {SSL_OP_ALL, 0},            /* bugs */
 727     {SSL_OP_NO_COMPRESSION, 0}, /* no_comp */
 728     {SSL_OP_NO_COMPRESSION, SSL_TFLAG_INV}, /* comp */
 729     {SSL_OP_SINGLE_ECDH_USE, 0}, /* ecdh_single */
 730     {SSL_OP_NO_TICKET, 0},      /* no_ticket */
 731     {SSL_OP_CIPHER_SERVER_PREFERENCE, 0}, /* serverpref */
 732     /* legacy_renegotiation */
 733     {SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION, 0},
 734     /* legacy_server_connect */
 735     {SSL_OP_LEGACY_SERVER_CONNECT, 0},
 736     /* no_renegotiation */
 737     {SSL_OP_NO_RENEGOTIATION, 0},
 738     /* no_resumption_on_reneg */
 739     {SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION, 0},
 740     /* no_legacy_server_connect */
 741     {SSL_OP_LEGACY_SERVER_CONNECT, SSL_TFLAG_INV},
 742     /* allow_no_dhe_kex */
 743     {SSL_OP_ALLOW_NO_DHE_KEX, 0},
 744     /* chacha reprioritization */
 745     {SSL_OP_PRIORITIZE_CHACHA, 0},
 746     {SSL_CERT_FLAG_TLS_STRICT, SSL_TFLAG_CERT}, /* strict */
 747     /* no_middlebox */
 748     {SSL_OP_ENABLE_MIDDLEBOX_COMPAT, SSL_TFLAG_INV},
 749     /* anti_replay */
 750     {SSL_OP_NO_ANTI_REPLAY, SSL_TFLAG_INV},
 751     /* no_anti_replay */
 752     {SSL_OP_NO_ANTI_REPLAY, 0},
 753 };
 754
 755 static int ssl_conf_cmd_skip_prefix(SSL_CONF_CTX *cctx, const char **pcmd)
 756 {
 757     if (pcmd == NULL || *pcmd == NULL)
 758         return 0;
 759     /* If a prefix is set, check and skip */
 760     if (cctx->prefix) {
 761         if (strlen(*pcmd) <= cctx->prefixlen)
 762             return 0;
 763         if (cctx->flags & SSL_CONF_FLAG_CMDLINE &&
 764             strncmp(*pcmd, cctx->prefix, cctx->prefixlen))
 765             return 0;
 766         if (cctx->flags & SSL_CONF_FLAG_FILE &&
 767             strncasecmp(*pcmd, cctx->prefix, cctx->prefixlen))
 768             return 0;
 769         *pcmd += cctx->prefixlen;
 770     } else if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
 771         if (**pcmd != '-' || !(*pcmd)[1])
 772             return 0;
 773         *pcmd += 1;
 774     }
 775     return 1;
 776 }
 777
 778 /* Determine if a command is allowed according to cctx flags */
 779 static int ssl_conf_cmd_allowed(SSL_CONF_CTX *cctx, const ssl_conf_cmd_tbl * t)
 780 {
 781     unsigned int tfl = t->flags;
 782     unsigned int cfl = cctx->flags;
 783     if ((tfl & SSL_CONF_FLAG_SERVER) && !(cfl & SSL_CONF_FLAG_SERVER))
 784         return 0;
 785     if ((tfl & SSL_CONF_FLAG_CLIENT) && !(cfl & SSL_CONF_FLAG_CLIENT))
 786         return 0;
 787     if ((tfl & SSL_CONF_FLAG_CERTIFICATE)
 788         && !(cfl & SSL_CONF_FLAG_CERTIFICATE))
 789         return 0;
 790     return 1;
 791 }
 792
 793 static const ssl_conf_cmd_tbl *ssl_conf_cmd_lookup(SSL_CONF_CTX *cctx,
 794                                                    const char *cmd)
 795 {
 796     const ssl_conf_cmd_tbl *t;
 797     size_t i;
 798     if (cmd == NULL)
 799         return NULL;
 800
 801     /* Look for matching parameter name in table */
 802     for (i = 0, t = ssl_conf_cmds; i < OSSL_NELEM(ssl_conf_cmds); i++, t++) {
 803         if (ssl_conf_cmd_allowed(cctx, t)) {
 804             if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
 805                 if (t->str_cmdline && strcmp(t->str_cmdline, cmd) == 0)
 806                     return t;
 807             }
 808             if (cctx->flags & SSL_CONF_FLAG_FILE) {
 809                 if (t->str_file && strcasecmp(t->str_file, cmd) == 0)
 810                     return t;
 811             }
 812         }
 813     }
 814     return NULL;
 815 }
 816
 817 static int ctrl_switch_option(SSL_CONF_CTX *cctx, const ssl_conf_cmd_tbl * cmd)
 818 {
 819     /* Find index of command in table */
 820     size_t idx = cmd - ssl_conf_cmds;
 821     const ssl_switch_tbl *scmd;
 822     /* Sanity check index */
 823     if (idx >= OSSL_NELEM(ssl_cmd_switches))
 824         return 0;
 825     /* Obtain switches entry with same index */
 826     scmd = ssl_cmd_switches + idx;
 827     ssl_set_option(cctx, scmd->name_flags, scmd->option_value, 1);
 828     return 1;
 829 }
 830
 831 int SSL_CONF_cmd(SSL_CONF_CTX *cctx, const char *cmd, const char *value)
 832 {
 833     const ssl_conf_cmd_tbl *runcmd;
 834     if (cmd == NULL) {
 835         SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_INVALID_NULL_CMD_NAME);
 836         return 0;
 837     }
 838
 839     if (!ssl_conf_cmd_skip_prefix(cctx, &cmd))
 840         return -2;
 841
 842     runcmd = ssl_conf_cmd_lookup(cctx, cmd);
 843
 844     if (runcmd) {
 845         int rv;
 846         if (runcmd->value_type == SSL_CONF_TYPE_NONE) {
 847             return ctrl_switch_option(cctx, runcmd);
 848         }
 849         if (value == NULL)
 850             return -3;
 851         rv = runcmd->cmd(cctx, value);
 852         if (rv > 0)
 853             return 2;
 854         if (rv == -2)
 855             return -2;
 856         if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS) {
 857             SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_BAD_VALUE);
 858             ERR_add_error_data(4, "cmd=", cmd, ", value=", value);
 859         }
 860         return 0;
 861     }
 862
 863     if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS) {
 864         SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_UNKNOWN_CMD_NAME);
 865         ERR_add_error_data(2, "cmd=", cmd);
 866     }
 867
 868     return -2;
 869 }
 870
 871 int SSL_CONF_cmd_argv(SSL_CONF_CTX *cctx, int *pargc, char ***pargv)
 872 {
 873     int rv;
 874     const char *arg = NULL, *argn;
 875
 876     if (pargc != NULL && *pargc == 0)
 877         return 0;
 878     if (pargc == NULL || *pargc > 0)
 879         arg = **pargv;
 880     if (arg == NULL)
 881         return 0;
 882     if (pargc == NULL || *pargc > 1)
 883         argn = (*pargv)[1];
 884     else
 885         argn = NULL;
 886     cctx->flags &= ~SSL_CONF_FLAG_FILE;
 887     cctx->flags |= SSL_CONF_FLAG_CMDLINE;
 888     rv = SSL_CONF_cmd(cctx, arg, argn);
 889     if (rv > 0) {
 890         /* Success: update pargc, pargv */
 891         (*pargv) += rv;
 892         if (pargc)
 893             (*pargc) -= rv;
 894         return rv;
 895     }
 896     /* Unknown switch: indicate no arguments processed */
 897     if (rv == -2)
 898         return 0;
 899     /* Some error occurred processing command, return fatal error */
 900     if (rv == 0)
 901         return -1;
 902     return rv;
 903 }
 904
 905 int SSL_CONF_cmd_value_type(SSL_CONF_CTX *cctx, const char *cmd)
 906 {
 907     if (ssl_conf_cmd_skip_prefix(cctx, &cmd)) {
 908         const ssl_conf_cmd_tbl *runcmd;
 909         runcmd = ssl_conf_cmd_lookup(cctx, cmd);
 910         if (runcmd)
 911             return runcmd->value_type;
 912     }
 913     return SSL_CONF_TYPE_UNKNOWN;
 914 }
 915
 916 SSL_CONF_CTX *SSL_CONF_CTX_new(void)
 917 {
 918     SSL_CONF_CTX *ret = OPENSSL_zalloc(sizeof(*ret));
 919
 920     return ret;
 921 }
 922
 923 int SSL_CONF_CTX_finish(SSL_CONF_CTX *cctx)
 924 {
 925     /* See if any certificates are missing private keys */
 926     size_t i;
 927     CERT *c = NULL;
 928     if (cctx->ctx)
 929         c = cctx->ctx->cert;
 930     else if (cctx->ssl)
 931         c = cctx->ssl->cert;
 932     if (c && cctx->flags & SSL_CONF_FLAG_REQUIRE_PRIVATE) {
 933         for (i = 0; i < SSL_PKEY_NUM; i++) {
 934             const char *p = cctx->cert_filename[i];
 935             /*
 936              * If missing private key try to load one from certificate file
 937              */
 938             if (p && !c->pkeys[i].privatekey) {
 939                 if (!cmd_PrivateKey(cctx, p))
 940                     return 0;
 941             }
 942         }
 943     }
 944     if (cctx->canames) {
 945         if (cctx->ssl)
 946             SSL_set0_CA_list(cctx->ssl, cctx->canames);
 947         else if (cctx->ctx)
 948             SSL_CTX_set0_CA_list(cctx->ctx, cctx->canames);
 949         else
 950             sk_X509_NAME_pop_free(cctx->canames, X509_NAME_free);
 951         cctx->canames = NULL;
 952     }
 953     return 1;
 954 }
 955
 956 void SSL_CONF_CTX_free(SSL_CONF_CTX *cctx)
 957 {
 958     if (cctx) {
 959         size_t i;
 960         for (i = 0; i < SSL_PKEY_NUM; i++)
 961             OPENSSL_free(cctx->cert_filename[i]);
 962         OPENSSL_free(cctx->prefix);
 963         sk_X509_NAME_pop_free(cctx->canames, X509_NAME_free);
 964         OPENSSL_free(cctx);
 965     }
 966 }
 967
 968 unsigned int SSL_CONF_CTX_set_flags(SSL_CONF_CTX *cctx, unsigned int flags)
 969 {
 970     cctx->flags |= flags;
 971     return cctx->flags;
 972 }
 973
 974 unsigned int SSL_CONF_CTX_clear_flags(SSL_CONF_CTX *cctx, unsigned int flags)
 975 {
 976     cctx->flags &= ~flags;
 977     return cctx->flags;
 978 }
 979
 980 int SSL_CONF_CTX_set1_prefix(SSL_CONF_CTX *cctx, const char *pre)
 981 {
 982     char *tmp = NULL;
 983     if (pre) {
 984         tmp = OPENSSL_strdup(pre);
 985         if (tmp == NULL)
 986             return 0;
 987     }
 988     OPENSSL_free(cctx->prefix);
 989     cctx->prefix = tmp;
 990     if (tmp)
 991         cctx->prefixlen = strlen(tmp);
 992     else
 993         cctx->prefixlen = 0;
 994     return 1;
 995 }
 996
 997 void SSL_CONF_CTX_set_ssl(SSL_CONF_CTX *cctx, SSL *ssl)
 998 {
 999     cctx->ssl = ssl;
1000     cctx->ctx = NULL;
1001     if (ssl) {
1002         cctx->poptions = &ssl->options;
1003         cctx->min_version = &ssl->min_proto_version;
1004         cctx->max_version = &ssl->max_proto_version;
1005         cctx->pcert_flags = &ssl->cert->cert_flags;
1006         cctx->pvfy_flags = &ssl->verify_mode;
1007     } else {
1008         cctx->poptions = NULL;
1009         cctx->min_version = NULL;
1010         cctx->max_version = NULL;
1011         cctx->pcert_flags = NULL;
1012         cctx->pvfy_flags = NULL;
1013     }
1014 }
1015
1016 void SSL_CONF_CTX_set_ssl_ctx(SSL_CONF_CTX *cctx, SSL_CTX *ctx)
1017 {
1018     cctx->ctx = ctx;
1019     cctx->ssl = NULL;
1020     if (ctx) {
1021         cctx->poptions = &ctx->options;
1022         cctx->min_version = &ctx->min_proto_version;
1023         cctx->max_version = &ctx->max_proto_version;
1024         cctx->pcert_flags = &ctx->cert->cert_flags;
1025         cctx->pvfy_flags = &ctx->verify_mode;
1026     } else {
1027         cctx->poptions = NULL;
1028         cctx->min_version = NULL;
1029         cctx->max_version = NULL;
1030         cctx->pcert_flags = NULL;
1031         cctx->pvfy_flags = NULL;
1032     }
1033 }