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     };
 385     if (value == NULL)
 386         return -3;
 387     cctx->tbl = ssl_option_list;
 388     cctx->ntbl = OSSL_NELEM(ssl_option_list);
 389     return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
 390 }
 391
 392 static int cmd_VerifyMode(SSL_CONF_CTX *cctx, const char *value)
 393 {
 394     static const ssl_flag_tbl ssl_vfy_list[] = {
 395         SSL_FLAG_VFY_CLI("Peer", SSL_VERIFY_PEER),
 396         SSL_FLAG_VFY_SRV("Request", SSL_VERIFY_PEER),
 397         SSL_FLAG_VFY_SRV("Require",
 398                          SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT),
 399         SSL_FLAG_VFY_SRV("Once", SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE),
 400         SSL_FLAG_VFY_SRV("RequestPostHandshake",
 401                          SSL_VERIFY_PEER | SSL_VERIFY_POST_HANDSHAKE),
 402         SSL_FLAG_VFY_SRV("RequirePostHandshake",
 403                          SSL_VERIFY_PEER | SSL_VERIFY_POST_HANDSHAKE |
 404                          SSL_VERIFY_FAIL_IF_NO_PEER_CERT),
 405     };
 406     if (value == NULL)
 407         return -3;
 408     cctx->tbl = ssl_vfy_list;
 409     cctx->ntbl = OSSL_NELEM(ssl_vfy_list);
 410     return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
 411 }
 412
 413 static int cmd_Certificate(SSL_CONF_CTX *cctx, const char *value)
 414 {
 415     int rv = 1;
 416     CERT *c = NULL;
 417     if (cctx->ctx) {
 418         rv = SSL_CTX_use_certificate_chain_file(cctx->ctx, value);
 419         c = cctx->ctx->cert;
 420     }
 421     if (cctx->ssl) {
 422         rv = SSL_use_certificate_chain_file(cctx->ssl, value);
 423         c = cctx->ssl->cert;
 424     }
 425     if (rv > 0 && c && cctx->flags & SSL_CONF_FLAG_REQUIRE_PRIVATE) {
 426         char **pfilename = &cctx->cert_filename[c->key - c->pkeys];
 427         OPENSSL_free(*pfilename);
 428         *pfilename = OPENSSL_strdup(value);
 429         if (!*pfilename)
 430             rv = 0;
 431     }
 432
 433     return rv > 0;
 434 }
 435
 436 static int cmd_PrivateKey(SSL_CONF_CTX *cctx, const char *value)
 437 {
 438     int rv = 1;
 439     if (!(cctx->flags & SSL_CONF_FLAG_CERTIFICATE))
 440         return -2;
 441     if (cctx->ctx)
 442         rv = SSL_CTX_use_PrivateKey_file(cctx->ctx, value, SSL_FILETYPE_PEM);
 443     if (cctx->ssl)
 444         rv = SSL_use_PrivateKey_file(cctx->ssl, value, SSL_FILETYPE_PEM);
 445     return rv > 0;
 446 }
 447
 448 static int cmd_ServerInfoFile(SSL_CONF_CTX *cctx, const char *value)
 449 {
 450     int rv = 1;
 451     if (cctx->ctx)
 452         rv = SSL_CTX_use_serverinfo_file(cctx->ctx, value);
 453     return rv > 0;
 454 }
 455
 456 static int do_store(SSL_CONF_CTX *cctx,
 457                     const char *CAfile, const char *CApath, int verify_store)
 458 {
 459     CERT *cert;
 460     X509_STORE **st;
 461     if (cctx->ctx)
 462         cert = cctx->ctx->cert;
 463     else if (cctx->ssl)
 464         cert = cctx->ssl->cert;
 465     else
 466         return 1;
 467     st = verify_store ? &cert->verify_store : &cert->chain_store;
 468     if (*st == NULL) {
 469         *st = X509_STORE_new();
 470         if (*st == NULL)
 471             return 0;
 472     }
 473     return X509_STORE_load_locations(*st, CAfile, CApath) > 0;
 474 }
 475
 476 static int cmd_ChainCAPath(SSL_CONF_CTX *cctx, const char *value)
 477 {
 478     return do_store(cctx, NULL, value, 0);
 479 }
 480
 481 static int cmd_ChainCAFile(SSL_CONF_CTX *cctx, const char *value)
 482 {
 483     return do_store(cctx, value, NULL, 0);
 484 }
 485
 486 static int cmd_VerifyCAPath(SSL_CONF_CTX *cctx, const char *value)
 487 {
 488     return do_store(cctx, NULL, value, 1);
 489 }
 490
 491 static int cmd_VerifyCAFile(SSL_CONF_CTX *cctx, const char *value)
 492 {
 493     return do_store(cctx, value, NULL, 1);
 494 }
 495
 496 static int cmd_RequestCAFile(SSL_CONF_CTX *cctx, const char *value)
 497 {
 498     if (cctx->canames == NULL)
 499         cctx->canames = sk_X509_NAME_new_null();
 500     if (cctx->canames == NULL)
 501         return 0;
 502     return SSL_add_file_cert_subjects_to_stack(cctx->canames, value);
 503 }
 504
 505 static int cmd_ClientCAFile(SSL_CONF_CTX *cctx, const char *value)
 506 {
 507     return cmd_RequestCAFile(cctx, value);
 508 }
 509
 510 static int cmd_RequestCAPath(SSL_CONF_CTX *cctx, const char *value)
 511 {
 512     if (cctx->canames == NULL)
 513         cctx->canames = sk_X509_NAME_new_null();
 514     if (cctx->canames == NULL)
 515         return 0;
 516     return SSL_add_dir_cert_subjects_to_stack(cctx->canames, value);
 517 }
 518
 519 static int cmd_ClientCAPath(SSL_CONF_CTX *cctx, const char *value)
 520 {
 521     return cmd_RequestCAPath(cctx, value);
 522 }
 523
 524 #ifndef OPENSSL_NO_DH
 525 static int cmd_DHParameters(SSL_CONF_CTX *cctx, const char *value)
 526 {
 527     int rv = 0;
 528     DH *dh = NULL;
 529     BIO *in = NULL;
 530     if (cctx->ctx || cctx->ssl) {
 531         in = BIO_new(BIO_s_file());
 532         if (in == NULL)
 533             goto end;
 534         if (BIO_read_filename(in, value) <= 0)
 535             goto end;
 536         dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL);
 537         if (dh == NULL)
 538             goto end;
 539     } else
 540         return 1;
 541     if (cctx->ctx)
 542         rv = SSL_CTX_set_tmp_dh(cctx->ctx, dh);
 543     if (cctx->ssl)
 544         rv = SSL_set_tmp_dh(cctx->ssl, dh);
 545  end:
 546     DH_free(dh);
 547     BIO_free(in);
 548     return rv > 0;
 549 }
 550 #endif
 551
 552 static int cmd_RecordPadding(SSL_CONF_CTX *cctx, const char *value)
 553 {
 554     int rv = 0;
 555     int block_size = atoi(value);
 556
 557     /*
 558      * All we care about is a non-negative value,
 559      * the setters check the range
 560      */
 561     if (block_size >= 0) {
 562         if (cctx->ctx)
 563             rv = SSL_CTX_set_block_padding(cctx->ctx, block_size);
 564         if (cctx->ssl)
 565             rv = SSL_set_block_padding(cctx->ssl, block_size);
 566     }
 567     return rv;
 568 }
 569
 570
 571 static int cmd_NumTickets(SSL_CONF_CTX *cctx, const char *value)
 572 {
 573     int rv = 0;
 574     int num_tickets = atoi(value);
 575
 576     if (num_tickets >= 0) {
 577         if (cctx->ctx)
 578             rv = SSL_CTX_set_num_tickets(cctx->ctx, num_tickets);
 579         if (cctx->ssl)
 580             rv = SSL_set_num_tickets(cctx->ssl, num_tickets);
 581     }
 582     return rv;
 583 }
 584
 585 typedef struct {
 586     int (*cmd) (SSL_CONF_CTX *cctx, const char *value);
 587     const char *str_file;
 588     const char *str_cmdline;
 589     unsigned short flags;
 590     unsigned short value_type;
 591 } ssl_conf_cmd_tbl;
 592
 593 /* Table of supported parameters */
 594
 595 #define SSL_CONF_CMD(name, cmdopt, flags, type) \
 596         {cmd_##name, #name, cmdopt, flags, type}
 597
 598 #define SSL_CONF_CMD_STRING(name, cmdopt, flags) \
 599         SSL_CONF_CMD(name, cmdopt, flags, SSL_CONF_TYPE_STRING)
 600
 601 #define SSL_CONF_CMD_SWITCH(name, flags) \
 602         {0, NULL, name, flags, SSL_CONF_TYPE_NONE}
 603
 604 /* See apps/apps.h if you change this table. */
 605 static const ssl_conf_cmd_tbl ssl_conf_cmds[] = {
 606     SSL_CONF_CMD_SWITCH("no_ssl3", 0),
 607     SSL_CONF_CMD_SWITCH("no_tls1", 0),
 608     SSL_CONF_CMD_SWITCH("no_tls1_1", 0),
 609     SSL_CONF_CMD_SWITCH("no_tls1_2", 0),
 610     SSL_CONF_CMD_SWITCH("no_tls1_3", 0),
 611     SSL_CONF_CMD_SWITCH("bugs", 0),
 612     SSL_CONF_CMD_SWITCH("no_comp", 0),
 613     SSL_CONF_CMD_SWITCH("comp", 0),
 614     SSL_CONF_CMD_SWITCH("ecdh_single", SSL_CONF_FLAG_SERVER),
 615     SSL_CONF_CMD_SWITCH("no_ticket", 0),
 616     SSL_CONF_CMD_SWITCH("serverpref", SSL_CONF_FLAG_SERVER),
 617     SSL_CONF_CMD_SWITCH("legacy_renegotiation", 0),
 618     SSL_CONF_CMD_SWITCH("legacy_server_connect", SSL_CONF_FLAG_SERVER),
 619     SSL_CONF_CMD_SWITCH("no_renegotiation", 0),
 620     SSL_CONF_CMD_SWITCH("no_resumption_on_reneg", SSL_CONF_FLAG_SERVER),
 621     SSL_CONF_CMD_SWITCH("no_legacy_server_connect", SSL_CONF_FLAG_SERVER),
 622     SSL_CONF_CMD_SWITCH("allow_no_dhe_kex", 0),
 623     SSL_CONF_CMD_SWITCH("prioritize_chacha", SSL_CONF_FLAG_SERVER),
 624     SSL_CONF_CMD_SWITCH("strict", 0),
 625     SSL_CONF_CMD_SWITCH("no_middlebox", 0),
 626     SSL_CONF_CMD_SWITCH("anti_replay", SSL_CONF_FLAG_SERVER),
 627     SSL_CONF_CMD_SWITCH("no_anti_replay", SSL_CONF_FLAG_SERVER),
 628     SSL_CONF_CMD_STRING(SignatureAlgorithms, "sigalgs", 0),
 629     SSL_CONF_CMD_STRING(ClientSignatureAlgorithms, "client_sigalgs", 0),
 630     SSL_CONF_CMD_STRING(Curves, "curves", 0),
 631     SSL_CONF_CMD_STRING(Groups, "groups", 0),
 632 #ifndef OPENSSL_NO_EC
 633     SSL_CONF_CMD_STRING(ECDHParameters, "named_curve", SSL_CONF_FLAG_SERVER),
 634 #endif
 635     SSL_CONF_CMD_STRING(CipherString, "cipher", 0),
 636     SSL_CONF_CMD_STRING(Ciphersuites, "ciphersuites", 0),
 637     SSL_CONF_CMD_STRING(Protocol, NULL, 0),
 638     SSL_CONF_CMD_STRING(MinProtocol, "min_protocol", 0),
 639     SSL_CONF_CMD_STRING(MaxProtocol, "max_protocol", 0),
 640     SSL_CONF_CMD_STRING(Options, NULL, 0),
 641     SSL_CONF_CMD_STRING(VerifyMode, NULL, 0),
 642     SSL_CONF_CMD(Certificate, "cert", SSL_CONF_FLAG_CERTIFICATE,
 643                  SSL_CONF_TYPE_FILE),
 644     SSL_CONF_CMD(PrivateKey, "key", SSL_CONF_FLAG_CERTIFICATE,
 645                  SSL_CONF_TYPE_FILE),
 646     SSL_CONF_CMD(ServerInfoFile, NULL,
 647                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 648                  SSL_CONF_TYPE_FILE),
 649     SSL_CONF_CMD(ChainCAPath, "chainCApath", SSL_CONF_FLAG_CERTIFICATE,
 650                  SSL_CONF_TYPE_DIR),
 651     SSL_CONF_CMD(ChainCAFile, "chainCAfile", SSL_CONF_FLAG_CERTIFICATE,
 652                  SSL_CONF_TYPE_FILE),
 653     SSL_CONF_CMD(VerifyCAPath, "verifyCApath", SSL_CONF_FLAG_CERTIFICATE,
 654                  SSL_CONF_TYPE_DIR),
 655     SSL_CONF_CMD(VerifyCAFile, "verifyCAfile", SSL_CONF_FLAG_CERTIFICATE,
 656                  SSL_CONF_TYPE_FILE),
 657     SSL_CONF_CMD(RequestCAFile, "requestCAFile", SSL_CONF_FLAG_CERTIFICATE,
 658                  SSL_CONF_TYPE_FILE),
 659     SSL_CONF_CMD(ClientCAFile, NULL,
 660                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 661                  SSL_CONF_TYPE_FILE),
 662     SSL_CONF_CMD(RequestCAPath, NULL, SSL_CONF_FLAG_CERTIFICATE,
 663                  SSL_CONF_TYPE_DIR),
 664     SSL_CONF_CMD(ClientCAPath, NULL,
 665                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 666                  SSL_CONF_TYPE_DIR),
 667 #ifndef OPENSSL_NO_DH
 668     SSL_CONF_CMD(DHParameters, "dhparam",
 669                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 670                  SSL_CONF_TYPE_FILE),
 671 #endif
 672     SSL_CONF_CMD_STRING(RecordPadding, "record_padding", 0),
 673     SSL_CONF_CMD_STRING(NumTickets, "num_tickets", SSL_CONF_FLAG_SERVER),
 674 };
 675
 676 /* Supported switches: must match order of switches in ssl_conf_cmds */
 677 static const ssl_switch_tbl ssl_cmd_switches[] = {
 678     {SSL_OP_NO_SSLv3, 0},       /* no_ssl3 */
 679     {SSL_OP_NO_TLSv1, 0},       /* no_tls1 */
 680     {SSL_OP_NO_TLSv1_1, 0},     /* no_tls1_1 */
 681     {SSL_OP_NO_TLSv1_2, 0},     /* no_tls1_2 */
 682     {SSL_OP_NO_TLSv1_3, 0},     /* no_tls1_3 */
 683     {SSL_OP_ALL, 0},            /* bugs */
 684     {SSL_OP_NO_COMPRESSION, 0}, /* no_comp */
 685     {SSL_OP_NO_COMPRESSION, SSL_TFLAG_INV}, /* comp */
 686     {SSL_OP_SINGLE_ECDH_USE, 0}, /* ecdh_single */
 687     {SSL_OP_NO_TICKET, 0},      /* no_ticket */
 688     {SSL_OP_CIPHER_SERVER_PREFERENCE, 0}, /* serverpref */
 689     /* legacy_renegotiation */
 690     {SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION, 0},
 691     /* legacy_server_connect */
 692     {SSL_OP_LEGACY_SERVER_CONNECT, 0},
 693     /* no_renegotiation */
 694     {SSL_OP_NO_RENEGOTIATION, 0},
 695     /* no_resumption_on_reneg */
 696     {SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION, 0},
 697     /* no_legacy_server_connect */
 698     {SSL_OP_LEGACY_SERVER_CONNECT, SSL_TFLAG_INV},
 699     /* allow_no_dhe_kex */
 700     {SSL_OP_ALLOW_NO_DHE_KEX, 0},
 701     /* chacha reprioritization */
 702     {SSL_OP_PRIORITIZE_CHACHA, 0},
 703     {SSL_CERT_FLAG_TLS_STRICT, SSL_TFLAG_CERT}, /* strict */
 704     /* no_middlebox */
 705     {SSL_OP_ENABLE_MIDDLEBOX_COMPAT, SSL_TFLAG_INV},
 706     /* anti_replay */
 707     {SSL_OP_NO_ANTI_REPLAY, SSL_TFLAG_INV},
 708     /* no_anti_replay */
 709     {SSL_OP_NO_ANTI_REPLAY, 0},
 710 };
 711
 712 static int ssl_conf_cmd_skip_prefix(SSL_CONF_CTX *cctx, const char **pcmd)
 713 {
 714     if (!pcmd || !*pcmd)
 715         return 0;
 716     /* If a prefix is set, check and skip */
 717     if (cctx->prefix) {
 718         if (strlen(*pcmd) <= cctx->prefixlen)
 719             return 0;
 720         if (cctx->flags & SSL_CONF_FLAG_CMDLINE &&
 721             strncmp(*pcmd, cctx->prefix, cctx->prefixlen))
 722             return 0;
 723         if (cctx->flags & SSL_CONF_FLAG_FILE &&
 724             strncasecmp(*pcmd, cctx->prefix, cctx->prefixlen))
 725             return 0;
 726         *pcmd += cctx->prefixlen;
 727     } else if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
 728         if (**pcmd != '-' || !(*pcmd)[1])
 729             return 0;
 730         *pcmd += 1;
 731     }
 732     return 1;
 733 }
 734
 735 /* Determine if a command is allowed according to cctx flags */
 736 static int ssl_conf_cmd_allowed(SSL_CONF_CTX *cctx, const ssl_conf_cmd_tbl * t)
 737 {
 738     unsigned int tfl = t->flags;
 739     unsigned int cfl = cctx->flags;
 740     if ((tfl & SSL_CONF_FLAG_SERVER) && !(cfl & SSL_CONF_FLAG_SERVER))
 741         return 0;
 742     if ((tfl & SSL_CONF_FLAG_CLIENT) && !(cfl & SSL_CONF_FLAG_CLIENT))
 743         return 0;
 744     if ((tfl & SSL_CONF_FLAG_CERTIFICATE)
 745         && !(cfl & SSL_CONF_FLAG_CERTIFICATE))
 746         return 0;
 747     return 1;
 748 }
 749
 750 static const ssl_conf_cmd_tbl *ssl_conf_cmd_lookup(SSL_CONF_CTX *cctx,
 751                                                    const char *cmd)
 752 {
 753     const ssl_conf_cmd_tbl *t;
 754     size_t i;
 755     if (cmd == NULL)
 756         return NULL;
 757
 758     /* Look for matching parameter name in table */
 759     for (i = 0, t = ssl_conf_cmds; i < OSSL_NELEM(ssl_conf_cmds); i++, t++) {
 760         if (ssl_conf_cmd_allowed(cctx, t)) {
 761             if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
 762                 if (t->str_cmdline && strcmp(t->str_cmdline, cmd) == 0)
 763                     return t;
 764             }
 765             if (cctx->flags & SSL_CONF_FLAG_FILE) {
 766                 if (t->str_file && strcasecmp(t->str_file, cmd) == 0)
 767                     return t;
 768             }
 769         }
 770     }
 771     return NULL;
 772 }
 773
 774 static int ctrl_switch_option(SSL_CONF_CTX *cctx, const ssl_conf_cmd_tbl * cmd)
 775 {
 776     /* Find index of command in table */
 777     size_t idx = cmd - ssl_conf_cmds;
 778     const ssl_switch_tbl *scmd;
 779     /* Sanity check index */
 780     if (idx >= OSSL_NELEM(ssl_cmd_switches))
 781         return 0;
 782     /* Obtain switches entry with same index */
 783     scmd = ssl_cmd_switches + idx;
 784     ssl_set_option(cctx, scmd->name_flags, scmd->option_value, 1);
 785     return 1;
 786 }
 787
 788 int SSL_CONF_cmd(SSL_CONF_CTX *cctx, const char *cmd, const char *value)
 789 {
 790     const ssl_conf_cmd_tbl *runcmd;
 791     if (cmd == NULL) {
 792         SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_INVALID_NULL_CMD_NAME);
 793         return 0;
 794     }
 795
 796     if (!ssl_conf_cmd_skip_prefix(cctx, &cmd))
 797         return -2;
 798
 799     runcmd = ssl_conf_cmd_lookup(cctx, cmd);
 800
 801     if (runcmd) {
 802         int rv;
 803         if (runcmd->value_type == SSL_CONF_TYPE_NONE) {
 804             return ctrl_switch_option(cctx, runcmd);
 805         }
 806         if (value == NULL)
 807             return -3;
 808         rv = runcmd->cmd(cctx, value);
 809         if (rv > 0)
 810             return 2;
 811         if (rv == -2)
 812             return -2;
 813         if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS) {
 814             SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_BAD_VALUE);
 815             ERR_add_error_data(4, "cmd=", cmd, ", value=", value);
 816         }
 817         return 0;
 818     }
 819
 820     if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS) {
 821         SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_UNKNOWN_CMD_NAME);
 822         ERR_add_error_data(2, "cmd=", cmd);
 823     }
 824
 825     return -2;
 826 }
 827
 828 int SSL_CONF_cmd_argv(SSL_CONF_CTX *cctx, int *pargc, char ***pargv)
 829 {
 830     int rv;
 831     const char *arg = NULL, *argn;
 832     if (pargc && *pargc == 0)
 833         return 0;
 834     if (!pargc || *pargc > 0)
 835         arg = **pargv;
 836     if (arg == NULL)
 837         return 0;
 838     if (!pargc || *pargc > 1)
 839         argn = (*pargv)[1];
 840     else
 841         argn = NULL;
 842     cctx->flags &= ~SSL_CONF_FLAG_FILE;
 843     cctx->flags |= SSL_CONF_FLAG_CMDLINE;
 844     rv = SSL_CONF_cmd(cctx, arg, argn);
 845     if (rv > 0) {
 846         /* Success: update pargc, pargv */
 847         (*pargv) += rv;
 848         if (pargc)
 849             (*pargc) -= rv;
 850         return rv;
 851     }
 852     /* Unknown switch: indicate no arguments processed */
 853     if (rv == -2)
 854         return 0;
 855     /* Some error occurred processing command, return fatal error */
 856     if (rv == 0)
 857         return -1;
 858     return rv;
 859 }
 860
 861 int SSL_CONF_cmd_value_type(SSL_CONF_CTX *cctx, const char *cmd)
 862 {
 863     if (ssl_conf_cmd_skip_prefix(cctx, &cmd)) {
 864         const ssl_conf_cmd_tbl *runcmd;
 865         runcmd = ssl_conf_cmd_lookup(cctx, cmd);
 866         if (runcmd)
 867             return runcmd->value_type;
 868     }
 869     return SSL_CONF_TYPE_UNKNOWN;
 870 }
 871
 872 SSL_CONF_CTX *SSL_CONF_CTX_new(void)
 873 {
 874     SSL_CONF_CTX *ret = OPENSSL_zalloc(sizeof(*ret));
 875
 876     return ret;
 877 }
 878
 879 int SSL_CONF_CTX_finish(SSL_CONF_CTX *cctx)
 880 {
 881     /* See if any certificates are missing private keys */
 882     size_t i;
 883     CERT *c = NULL;
 884     if (cctx->ctx)
 885         c = cctx->ctx->cert;
 886     else if (cctx->ssl)
 887         c = cctx->ssl->cert;
 888     if (c && cctx->flags & SSL_CONF_FLAG_REQUIRE_PRIVATE) {
 889         for (i = 0; i < SSL_PKEY_NUM; i++) {
 890             const char *p = cctx->cert_filename[i];
 891             /*
 892              * If missing private key try to load one from certificate file
 893              */
 894             if (p && !c->pkeys[i].privatekey) {
 895                 if (!cmd_PrivateKey(cctx, p))
 896                     return 0;
 897             }
 898         }
 899     }
 900     if (cctx->canames) {
 901         if (cctx->ssl)
 902             SSL_set0_CA_list(cctx->ssl, cctx->canames);
 903         else if (cctx->ctx)
 904             SSL_CTX_set0_CA_list(cctx->ctx, cctx->canames);
 905         else
 906             sk_X509_NAME_pop_free(cctx->canames, X509_NAME_free);
 907         cctx->canames = NULL;
 908     }
 909     return 1;
 910 }
 911
 912 void SSL_CONF_CTX_free(SSL_CONF_CTX *cctx)
 913 {
 914     if (cctx) {
 915         size_t i;
 916         for (i = 0; i < SSL_PKEY_NUM; i++)
 917             OPENSSL_free(cctx->cert_filename[i]);
 918         OPENSSL_free(cctx->prefix);
 919         sk_X509_NAME_pop_free(cctx->canames, X509_NAME_free);
 920         OPENSSL_free(cctx);
 921     }
 922 }
 923
 924 unsigned int SSL_CONF_CTX_set_flags(SSL_CONF_CTX *cctx, unsigned int flags)
 925 {
 926     cctx->flags |= flags;
 927     return cctx->flags;
 928 }
 929
 930 unsigned int SSL_CONF_CTX_clear_flags(SSL_CONF_CTX *cctx, unsigned int flags)
 931 {
 932     cctx->flags &= ~flags;
 933     return cctx->flags;
 934 }
 935
 936 int SSL_CONF_CTX_set1_prefix(SSL_CONF_CTX *cctx, const char *pre)
 937 {
 938     char *tmp = NULL;
 939     if (pre) {
 940         tmp = OPENSSL_strdup(pre);
 941         if (tmp == NULL)
 942             return 0;
 943     }
 944     OPENSSL_free(cctx->prefix);
 945     cctx->prefix = tmp;
 946     if (tmp)
 947         cctx->prefixlen = strlen(tmp);
 948     else
 949         cctx->prefixlen = 0;
 950     return 1;
 951 }
 952
 953 void SSL_CONF_CTX_set_ssl(SSL_CONF_CTX *cctx, SSL *ssl)
 954 {
 955     cctx->ssl = ssl;
 956     cctx->ctx = NULL;
 957     if (ssl) {
 958         cctx->poptions = &ssl->options;
 959         cctx->min_version = &ssl->min_proto_version;
 960         cctx->max_version = &ssl->max_proto_version;
 961         cctx->pcert_flags = &ssl->cert->cert_flags;
 962         cctx->pvfy_flags = &ssl->verify_mode;
 963     } else {
 964         cctx->poptions = NULL;
 965         cctx->min_version = NULL;
 966         cctx->max_version = NULL;
 967         cctx->pcert_flags = NULL;
 968         cctx->pvfy_flags = NULL;
 969     }
 970 }
 971
 972 void SSL_CONF_CTX_set_ssl_ctx(SSL_CONF_CTX *cctx, SSL_CTX *ctx)
 973 {
 974     cctx->ctx = ctx;
 975     cctx->ssl = NULL;
 976     if (ctx) {
 977         cctx->poptions = &ctx->options;
 978         cctx->min_version = &ctx->min_proto_version;
 979         cctx->max_version = &ctx->max_proto_version;
 980         cctx->pcert_flags = &ctx->cert->cert_flags;
 981         cctx->pvfy_flags = &ctx->verify_mode;
 982     } else {
 983         cctx->poptions = NULL;
 984         cctx->min_version = NULL;
 985         cctx->max_version = NULL;
 986         cctx->pcert_flags = NULL;
 987         cctx->pvfy_flags = NULL;
 988     }
 989 }