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_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     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)
 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, int verify_store)
 459 {
 460     CERT *cert;
 461     X509_STORE **st;
 462     if (cctx->ctx)
 463         cert = cctx->ctx->cert;
 464     else if (cctx->ssl)
 465         cert = cctx->ssl->cert;
 466     else
 467         return 1;
 468     st = verify_store ? &cert->verify_store : &cert->chain_store;
 469     if (*st == NULL) {
 470         *st = X509_STORE_new();
 471         if (*st == NULL)
 472             return 0;
 473     }
 474     return X509_STORE_load_locations(*st, CAfile, CApath) > 0;
 475 }
 476
 477 static int cmd_ChainCAPath(SSL_CONF_CTX *cctx, const char *value)
 478 {
 479     return do_store(cctx, NULL, value, 0);
 480 }
 481
 482 static int cmd_ChainCAFile(SSL_CONF_CTX *cctx, const char *value)
 483 {
 484     return do_store(cctx, value, NULL, 0);
 485 }
 486
 487 static int cmd_VerifyCAPath(SSL_CONF_CTX *cctx, const char *value)
 488 {
 489     return do_store(cctx, NULL, value, 1);
 490 }
 491
 492 static int cmd_VerifyCAFile(SSL_CONF_CTX *cctx, const char *value)
 493 {
 494     return do_store(cctx, value, NULL, 1);
 495 }
 496
 497 static int cmd_RequestCAFile(SSL_CONF_CTX *cctx, const char *value)
 498 {
 499     if (cctx->canames == NULL)
 500         cctx->canames = sk_X509_NAME_new_null();
 501     if (cctx->canames == NULL)
 502         return 0;
 503     return SSL_add_file_cert_subjects_to_stack(cctx->canames, value);
 504 }
 505
 506 static int cmd_ClientCAFile(SSL_CONF_CTX *cctx, const char *value)
 507 {
 508     return cmd_RequestCAFile(cctx, value);
 509 }
 510
 511 static int cmd_RequestCAPath(SSL_CONF_CTX *cctx, const char *value)
 512 {
 513     if (cctx->canames == NULL)
 514         cctx->canames = sk_X509_NAME_new_null();
 515     if (cctx->canames == NULL)
 516         return 0;
 517     return SSL_add_dir_cert_subjects_to_stack(cctx->canames, value);
 518 }
 519
 520 static int cmd_ClientCAPath(SSL_CONF_CTX *cctx, const char *value)
 521 {
 522     return cmd_RequestCAPath(cctx, value);
 523 }
 524
 525 #ifndef OPENSSL_NO_DH
 526 static int cmd_DHParameters(SSL_CONF_CTX *cctx, const char *value)
 527 {
 528     int rv = 0;
 529     DH *dh = NULL;
 530     BIO *in = NULL;
 531     if (cctx->ctx || cctx->ssl) {
 532         in = BIO_new(BIO_s_file());
 533         if (in == NULL)
 534             goto end;
 535         if (BIO_read_filename(in, value) <= 0)
 536             goto end;
 537         dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL);
 538         if (dh == NULL)
 539             goto end;
 540     } else
 541         return 1;
 542     if (cctx->ctx)
 543         rv = SSL_CTX_set_tmp_dh(cctx->ctx, dh);
 544     if (cctx->ssl)
 545         rv = SSL_set_tmp_dh(cctx->ssl, dh);
 546  end:
 547     DH_free(dh);
 548     BIO_free(in);
 549     return rv > 0;
 550 }
 551 #endif
 552
 553 static int cmd_RecordPadding(SSL_CONF_CTX *cctx, const char *value)
 554 {
 555     int rv = 0;
 556     int block_size = atoi(value);
 557
 558     /*
 559      * All we care about is a non-negative value,
 560      * the setters check the range
 561      */
 562     if (block_size >= 0) {
 563         if (cctx->ctx)
 564             rv = SSL_CTX_set_block_padding(cctx->ctx, block_size);
 565         if (cctx->ssl)
 566             rv = SSL_set_block_padding(cctx->ssl, block_size);
 567     }
 568     return rv;
 569 }
 570
 571
 572 static int cmd_NumTickets(SSL_CONF_CTX *cctx, const char *value)
 573 {
 574     int rv = 0;
 575     int num_tickets = atoi(value);
 576
 577     if (num_tickets >= 0) {
 578         if (cctx->ctx)
 579             rv = SSL_CTX_set_num_tickets(cctx->ctx, num_tickets);
 580         if (cctx->ssl)
 581             rv = SSL_set_num_tickets(cctx->ssl, num_tickets);
 582     }
 583     return rv;
 584 }
 585
 586 typedef struct {
 587     int (*cmd) (SSL_CONF_CTX *cctx, const char *value);
 588     const char *str_file;
 589     const char *str_cmdline;
 590     unsigned short flags;
 591     unsigned short value_type;
 592 } ssl_conf_cmd_tbl;
 593
 594 /* Table of supported parameters */
 595
 596 #define SSL_CONF_CMD(name, cmdopt, flags, type) \
 597         {cmd_##name, #name, cmdopt, flags, type}
 598
 599 #define SSL_CONF_CMD_STRING(name, cmdopt, flags) \
 600         SSL_CONF_CMD(name, cmdopt, flags, SSL_CONF_TYPE_STRING)
 601
 602 #define SSL_CONF_CMD_SWITCH(name, flags) \
 603         {0, NULL, name, flags, SSL_CONF_TYPE_NONE}
 604
 605 /* See apps/apps.h if you change this table. */
 606 static const ssl_conf_cmd_tbl ssl_conf_cmds[] = {
 607     SSL_CONF_CMD_SWITCH("no_ssl3", 0),
 608     SSL_CONF_CMD_SWITCH("no_tls1", 0),
 609     SSL_CONF_CMD_SWITCH("no_tls1_1", 0),
 610     SSL_CONF_CMD_SWITCH("no_tls1_2", 0),
 611     SSL_CONF_CMD_SWITCH("no_tls1_3", 0),
 612     SSL_CONF_CMD_SWITCH("bugs", 0),
 613     SSL_CONF_CMD_SWITCH("no_comp", 0),
 614     SSL_CONF_CMD_SWITCH("comp", 0),
 615     SSL_CONF_CMD_SWITCH("ecdh_single", SSL_CONF_FLAG_SERVER),
 616     SSL_CONF_CMD_SWITCH("no_ticket", 0),
 617     SSL_CONF_CMD_SWITCH("serverpref", SSL_CONF_FLAG_SERVER),
 618     SSL_CONF_CMD_SWITCH("legacy_renegotiation", 0),
 619     SSL_CONF_CMD_SWITCH("legacy_server_connect", SSL_CONF_FLAG_SERVER),
 620     SSL_CONF_CMD_SWITCH("no_renegotiation", 0),
 621     SSL_CONF_CMD_SWITCH("no_resumption_on_reneg", SSL_CONF_FLAG_SERVER),
 622     SSL_CONF_CMD_SWITCH("no_legacy_server_connect", SSL_CONF_FLAG_SERVER),
 623     SSL_CONF_CMD_SWITCH("allow_no_dhe_kex", 0),
 624     SSL_CONF_CMD_SWITCH("prioritize_chacha", SSL_CONF_FLAG_SERVER),
 625     SSL_CONF_CMD_SWITCH("strict", 0),
 626     SSL_CONF_CMD_SWITCH("no_middlebox", 0),
 627     SSL_CONF_CMD_SWITCH("anti_replay", SSL_CONF_FLAG_SERVER),
 628     SSL_CONF_CMD_SWITCH("no_anti_replay", SSL_CONF_FLAG_SERVER),
 629     SSL_CONF_CMD_STRING(SignatureAlgorithms, "sigalgs", 0),
 630     SSL_CONF_CMD_STRING(ClientSignatureAlgorithms, "client_sigalgs", 0),
 631     SSL_CONF_CMD_STRING(Curves, "curves", 0),
 632     SSL_CONF_CMD_STRING(Groups, "groups", 0),
 633 #ifndef OPENSSL_NO_EC
 634     SSL_CONF_CMD_STRING(ECDHParameters, "named_curve", SSL_CONF_FLAG_SERVER),
 635 #endif
 636     SSL_CONF_CMD_STRING(CipherString, "cipher", 0),
 637     SSL_CONF_CMD_STRING(Ciphersuites, "ciphersuites", 0),
 638     SSL_CONF_CMD_STRING(Protocol, NULL, 0),
 639     SSL_CONF_CMD_STRING(MinProtocol, "min_protocol", 0),
 640     SSL_CONF_CMD_STRING(MaxProtocol, "max_protocol", 0),
 641     SSL_CONF_CMD_STRING(Options, NULL, 0),
 642     SSL_CONF_CMD_STRING(VerifyMode, NULL, 0),
 643     SSL_CONF_CMD(Certificate, "cert", SSL_CONF_FLAG_CERTIFICATE,
 644                  SSL_CONF_TYPE_FILE),
 645     SSL_CONF_CMD(PrivateKey, "key", SSL_CONF_FLAG_CERTIFICATE,
 646                  SSL_CONF_TYPE_FILE),
 647     SSL_CONF_CMD(ServerInfoFile, NULL,
 648                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 649                  SSL_CONF_TYPE_FILE),
 650     SSL_CONF_CMD(ChainCAPath, "chainCApath", SSL_CONF_FLAG_CERTIFICATE,
 651                  SSL_CONF_TYPE_DIR),
 652     SSL_CONF_CMD(ChainCAFile, "chainCAfile", SSL_CONF_FLAG_CERTIFICATE,
 653                  SSL_CONF_TYPE_FILE),
 654     SSL_CONF_CMD(VerifyCAPath, "verifyCApath", SSL_CONF_FLAG_CERTIFICATE,
 655                  SSL_CONF_TYPE_DIR),
 656     SSL_CONF_CMD(VerifyCAFile, "verifyCAfile", SSL_CONF_FLAG_CERTIFICATE,
 657                  SSL_CONF_TYPE_FILE),
 658     SSL_CONF_CMD(RequestCAFile, "requestCAFile", SSL_CONF_FLAG_CERTIFICATE,
 659                  SSL_CONF_TYPE_FILE),
 660     SSL_CONF_CMD(ClientCAFile, NULL,
 661                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 662                  SSL_CONF_TYPE_FILE),
 663     SSL_CONF_CMD(RequestCAPath, NULL, SSL_CONF_FLAG_CERTIFICATE,
 664                  SSL_CONF_TYPE_DIR),
 665     SSL_CONF_CMD(ClientCAPath, NULL,
 666                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 667                  SSL_CONF_TYPE_DIR),
 668 #ifndef OPENSSL_NO_DH
 669     SSL_CONF_CMD(DHParameters, "dhparam",
 670                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 671                  SSL_CONF_TYPE_FILE),
 672 #endif
 673     SSL_CONF_CMD_STRING(RecordPadding, "record_padding", 0),
 674     SSL_CONF_CMD_STRING(NumTickets, "num_tickets", SSL_CONF_FLAG_SERVER),
 675 };
 676
 677 /* Supported switches: must match order of switches in ssl_conf_cmds */
 678 static const ssl_switch_tbl ssl_cmd_switches[] = {
 679     {SSL_OP_NO_SSLv3, 0},       /* no_ssl3 */
 680     {SSL_OP_NO_TLSv1, 0},       /* no_tls1 */
 681     {SSL_OP_NO_TLSv1_1, 0},     /* no_tls1_1 */
 682     {SSL_OP_NO_TLSv1_2, 0},     /* no_tls1_2 */
 683     {SSL_OP_NO_TLSv1_3, 0},     /* no_tls1_3 */
 684     {SSL_OP_ALL, 0},            /* bugs */
 685     {SSL_OP_NO_COMPRESSION, 0}, /* no_comp */
 686     {SSL_OP_NO_COMPRESSION, SSL_TFLAG_INV}, /* comp */
 687     {SSL_OP_SINGLE_ECDH_USE, 0}, /* ecdh_single */
 688     {SSL_OP_NO_TICKET, 0},      /* no_ticket */
 689     {SSL_OP_CIPHER_SERVER_PREFERENCE, 0}, /* serverpref */
 690     /* legacy_renegotiation */
 691     {SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION, 0},
 692     /* legacy_server_connect */
 693     {SSL_OP_LEGACY_SERVER_CONNECT, 0},
 694     /* no_renegotiation */
 695     {SSL_OP_NO_RENEGOTIATION, 0},
 696     /* no_resumption_on_reneg */
 697     {SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION, 0},
 698     /* no_legacy_server_connect */
 699     {SSL_OP_LEGACY_SERVER_CONNECT, SSL_TFLAG_INV},
 700     /* allow_no_dhe_kex */
 701     {SSL_OP_ALLOW_NO_DHE_KEX, 0},
 702     /* chacha reprioritization */
 703     {SSL_OP_PRIORITIZE_CHACHA, 0},
 704     {SSL_CERT_FLAG_TLS_STRICT, SSL_TFLAG_CERT}, /* strict */
 705     /* no_middlebox */
 706     {SSL_OP_ENABLE_MIDDLEBOX_COMPAT, SSL_TFLAG_INV},
 707     /* anti_replay */
 708     {SSL_OP_NO_ANTI_REPLAY, SSL_TFLAG_INV},
 709     /* no_anti_replay */
 710     {SSL_OP_NO_ANTI_REPLAY, 0},
 711 };
 712
 713 static int ssl_conf_cmd_skip_prefix(SSL_CONF_CTX *cctx, const char **pcmd)
 714 {
 715     if (!pcmd || !*pcmd)
 716         return 0;
 717     /* If a prefix is set, check and skip */
 718     if (cctx->prefix) {
 719         if (strlen(*pcmd) <= cctx->prefixlen)
 720             return 0;
 721         if (cctx->flags & SSL_CONF_FLAG_CMDLINE &&
 722             strncmp(*pcmd, cctx->prefix, cctx->prefixlen))
 723             return 0;
 724         if (cctx->flags & SSL_CONF_FLAG_FILE &&
 725             strncasecmp(*pcmd, cctx->prefix, cctx->prefixlen))
 726             return 0;
 727         *pcmd += cctx->prefixlen;
 728     } else if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
 729         if (**pcmd != '-' || !(*pcmd)[1])
 730             return 0;
 731         *pcmd += 1;
 732     }
 733     return 1;
 734 }
 735
 736 /* Determine if a command is allowed according to cctx flags */
 737 static int ssl_conf_cmd_allowed(SSL_CONF_CTX *cctx, const ssl_conf_cmd_tbl * t)
 738 {
 739     unsigned int tfl = t->flags;
 740     unsigned int cfl = cctx->flags;
 741     if ((tfl & SSL_CONF_FLAG_SERVER) && !(cfl & SSL_CONF_FLAG_SERVER))
 742         return 0;
 743     if ((tfl & SSL_CONF_FLAG_CLIENT) && !(cfl & SSL_CONF_FLAG_CLIENT))
 744         return 0;
 745     if ((tfl & SSL_CONF_FLAG_CERTIFICATE)
 746         && !(cfl & SSL_CONF_FLAG_CERTIFICATE))
 747         return 0;
 748     return 1;
 749 }
 750
 751 static const ssl_conf_cmd_tbl *ssl_conf_cmd_lookup(SSL_CONF_CTX *cctx,
 752                                                    const char *cmd)
 753 {
 754     const ssl_conf_cmd_tbl *t;
 755     size_t i;
 756     if (cmd == NULL)
 757         return NULL;
 758
 759     /* Look for matching parameter name in table */
 760     for (i = 0, t = ssl_conf_cmds; i < OSSL_NELEM(ssl_conf_cmds); i++, t++) {
 761         if (ssl_conf_cmd_allowed(cctx, t)) {
 762             if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
 763                 if (t->str_cmdline && strcmp(t->str_cmdline, cmd) == 0)
 764                     return t;
 765             }
 766             if (cctx->flags & SSL_CONF_FLAG_FILE) {
 767                 if (t->str_file && strcasecmp(t->str_file, cmd) == 0)
 768                     return t;
 769             }
 770         }
 771     }
 772     return NULL;
 773 }
 774
 775 static int ctrl_switch_option(SSL_CONF_CTX *cctx, const ssl_conf_cmd_tbl * cmd)
 776 {
 777     /* Find index of command in table */
 778     size_t idx = cmd - ssl_conf_cmds;
 779     const ssl_switch_tbl *scmd;
 780     /* Sanity check index */
 781     if (idx >= OSSL_NELEM(ssl_cmd_switches))
 782         return 0;
 783     /* Obtain switches entry with same index */
 784     scmd = ssl_cmd_switches + idx;
 785     ssl_set_option(cctx, scmd->name_flags, scmd->option_value, 1);
 786     return 1;
 787 }
 788
 789 int SSL_CONF_cmd(SSL_CONF_CTX *cctx, const char *cmd, const char *value)
 790 {
 791     const ssl_conf_cmd_tbl *runcmd;
 792     if (cmd == NULL) {
 793         SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_INVALID_NULL_CMD_NAME);
 794         return 0;
 795     }
 796
 797     if (!ssl_conf_cmd_skip_prefix(cctx, &cmd))
 798         return -2;
 799
 800     runcmd = ssl_conf_cmd_lookup(cctx, cmd);
 801
 802     if (runcmd) {
 803         int rv;
 804         if (runcmd->value_type == SSL_CONF_TYPE_NONE) {
 805             return ctrl_switch_option(cctx, runcmd);
 806         }
 807         if (value == NULL)
 808             return -3;
 809         rv = runcmd->cmd(cctx, value);
 810         if (rv > 0)
 811             return 2;
 812         if (rv == -2)
 813             return -2;
 814         if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS) {
 815             SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_BAD_VALUE);
 816             ERR_add_error_data(4, "cmd=", cmd, ", value=", value);
 817         }
 818         return 0;
 819     }
 820
 821     if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS) {
 822         SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_UNKNOWN_CMD_NAME);
 823         ERR_add_error_data(2, "cmd=", cmd);
 824     }
 825
 826     return -2;
 827 }
 828
 829 int SSL_CONF_cmd_argv(SSL_CONF_CTX *cctx, int *pargc, char ***pargv)
 830 {
 831     int rv;
 832     const char *arg = NULL, *argn;
 833     if (pargc && *pargc == 0)
 834         return 0;
 835     if (!pargc || *pargc > 0)
 836         arg = **pargv;
 837     if (arg == NULL)
 838         return 0;
 839     if (!pargc || *pargc > 1)
 840         argn = (*pargv)[1];
 841     else
 842         argn = NULL;
 843     cctx->flags &= ~SSL_CONF_FLAG_FILE;
 844     cctx->flags |= SSL_CONF_FLAG_CMDLINE;
 845     rv = SSL_CONF_cmd(cctx, arg, argn);
 846     if (rv > 0) {
 847         /* Success: update pargc, pargv */
 848         (*pargv) += rv;
 849         if (pargc)
 850             (*pargc) -= rv;
 851         return rv;
 852     }
 853     /* Unknown switch: indicate no arguments processed */
 854     if (rv == -2)
 855         return 0;
 856     /* Some error occurred processing command, return fatal error */
 857     if (rv == 0)
 858         return -1;
 859     return rv;
 860 }
 861
 862 int SSL_CONF_cmd_value_type(SSL_CONF_CTX *cctx, const char *cmd)
 863 {
 864     if (ssl_conf_cmd_skip_prefix(cctx, &cmd)) {
 865         const ssl_conf_cmd_tbl *runcmd;
 866         runcmd = ssl_conf_cmd_lookup(cctx, cmd);
 867         if (runcmd)
 868             return runcmd->value_type;
 869     }
 870     return SSL_CONF_TYPE_UNKNOWN;
 871 }
 872
 873 SSL_CONF_CTX *SSL_CONF_CTX_new(void)
 874 {
 875     SSL_CONF_CTX *ret = OPENSSL_zalloc(sizeof(*ret));
 876
 877     return ret;
 878 }
 879
 880 int SSL_CONF_CTX_finish(SSL_CONF_CTX *cctx)
 881 {
 882     /* See if any certificates are missing private keys */
 883     size_t i;
 884     CERT *c = NULL;
 885     if (cctx->ctx)
 886         c = cctx->ctx->cert;
 887     else if (cctx->ssl)
 888         c = cctx->ssl->cert;
 889     if (c && cctx->flags & SSL_CONF_FLAG_REQUIRE_PRIVATE) {
 890         for (i = 0; i < SSL_PKEY_NUM; i++) {
 891             const char *p = cctx->cert_filename[i];
 892             /*
 893              * If missing private key try to load one from certificate file
 894              */
 895             if (p && !c->pkeys[i].privatekey) {
 896                 if (!cmd_PrivateKey(cctx, p))
 897                     return 0;
 898             }
 899         }
 900     }
 901     if (cctx->canames) {
 902         if (cctx->ssl)
 903             SSL_set0_CA_list(cctx->ssl, cctx->canames);
 904         else if (cctx->ctx)
 905             SSL_CTX_set0_CA_list(cctx->ctx, cctx->canames);
 906         else
 907             sk_X509_NAME_pop_free(cctx->canames, X509_NAME_free);
 908         cctx->canames = NULL;
 909     }
 910     return 1;
 911 }
 912
 913 void SSL_CONF_CTX_free(SSL_CONF_CTX *cctx)
 914 {
 915     if (cctx) {
 916         size_t i;
 917         for (i = 0; i < SSL_PKEY_NUM; i++)
 918             OPENSSL_free(cctx->cert_filename[i]);
 919         OPENSSL_free(cctx->prefix);
 920         sk_X509_NAME_pop_free(cctx->canames, X509_NAME_free);
 921         OPENSSL_free(cctx);
 922     }
 923 }
 924
 925 unsigned int SSL_CONF_CTX_set_flags(SSL_CONF_CTX *cctx, unsigned int flags)
 926 {
 927     cctx->flags |= flags;
 928     return cctx->flags;
 929 }
 930
 931 unsigned int SSL_CONF_CTX_clear_flags(SSL_CONF_CTX *cctx, unsigned int flags)
 932 {
 933     cctx->flags &= ~flags;
 934     return cctx->flags;
 935 }
 936
 937 int SSL_CONF_CTX_set1_prefix(SSL_CONF_CTX *cctx, const char *pre)
 938 {
 939     char *tmp = NULL;
 940     if (pre) {
 941         tmp = OPENSSL_strdup(pre);
 942         if (tmp == NULL)
 943             return 0;
 944     }
 945     OPENSSL_free(cctx->prefix);
 946     cctx->prefix = tmp;
 947     if (tmp)
 948         cctx->prefixlen = strlen(tmp);
 949     else
 950         cctx->prefixlen = 0;
 951     return 1;
 952 }
 953
 954 void SSL_CONF_CTX_set_ssl(SSL_CONF_CTX *cctx, SSL *ssl)
 955 {
 956     cctx->ssl = ssl;
 957     cctx->ctx = NULL;
 958     if (ssl) {
 959         cctx->poptions = &ssl->options;
 960         cctx->min_version = &ssl->min_proto_version;
 961         cctx->max_version = &ssl->max_proto_version;
 962         cctx->pcert_flags = &ssl->cert->cert_flags;
 963         cctx->pvfy_flags = &ssl->verify_mode;
 964     } else {
 965         cctx->poptions = NULL;
 966         cctx->min_version = NULL;
 967         cctx->max_version = NULL;
 968         cctx->pcert_flags = NULL;
 969         cctx->pvfy_flags = NULL;
 970     }
 971 }
 972
 973 void SSL_CONF_CTX_set_ssl_ctx(SSL_CONF_CTX *cctx, SSL_CTX *ctx)
 974 {
 975     cctx->ctx = ctx;
 976     cctx->ssl = NULL;
 977     if (ctx) {
 978         cctx->poptions = &ctx->options;
 979         cctx->min_version = &ctx->min_proto_version;
 980         cctx->max_version = &ctx->max_proto_version;
 981         cctx->pcert_flags = &ctx->cert->cert_flags;
 982         cctx->pvfy_flags = &ctx->verify_mode;
 983     } else {
 984         cctx->poptions = NULL;
 985         cctx->min_version = NULL;
 986         cctx->max_version = NULL;
 987         cctx->pcert_flags = NULL;
 988         cctx->pvfy_flags = NULL;
 989     }
 990 }