ssl/ssl_conf.c

   1 /*
   2  * Copyright 2012-2020 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 DEFINE_STACK_OF(X509_NAME)
  18
  19 /*
  20  * structure holding name tables. This is used for permitted elements in lists
  21  * such as TLSv1.
  22  */
  23
  24 typedef struct {
  25     const char *name;
  26     int namelen;
  27     unsigned int name_flags;
  28     unsigned long option_value;
  29 } ssl_flag_tbl;
  30
  31 /* Switch table: use for single command line switches like no_tls2 */
  32 typedef struct {
  33     unsigned long option_value;
  34     unsigned int name_flags;
  35 } ssl_switch_tbl;
  36
  37 /* Sense of name is inverted e.g. "TLSv1" will clear SSL_OP_NO_TLSv1 */
  38 #define SSL_TFLAG_INV   0x1
  39 /* Mask for type of flag referred to */
  40 #define SSL_TFLAG_TYPE_MASK 0xf00
  41 /* Flag is for options */
  42 #define SSL_TFLAG_OPTION    0x000
  43 /* Flag is for cert_flags */
  44 #define SSL_TFLAG_CERT      0x100
  45 /* Flag is for verify mode */
  46 #define SSL_TFLAG_VFY       0x200
  47 /* Option can only be used for clients */
  48 #define SSL_TFLAG_CLIENT SSL_CONF_FLAG_CLIENT
  49 /* Option can only be used for servers */
  50 #define SSL_TFLAG_SERVER SSL_CONF_FLAG_SERVER
  51 #define SSL_TFLAG_BOTH (SSL_TFLAG_CLIENT|SSL_TFLAG_SERVER)
  52
  53 #define SSL_FLAG_TBL(str, flag) \
  54         {str, (int)(sizeof(str) - 1), SSL_TFLAG_BOTH, flag}
  55 #define SSL_FLAG_TBL_SRV(str, flag) \
  56         {str, (int)(sizeof(str) - 1), SSL_TFLAG_SERVER, flag}
  57 #define SSL_FLAG_TBL_CLI(str, flag) \
  58         {str, (int)(sizeof(str) - 1), SSL_TFLAG_CLIENT, flag}
  59 #define SSL_FLAG_TBL_INV(str, flag) \
  60         {str, (int)(sizeof(str) - 1), SSL_TFLAG_INV|SSL_TFLAG_BOTH, flag}
  61 #define SSL_FLAG_TBL_SRV_INV(str, flag) \
  62         {str, (int)(sizeof(str) - 1), SSL_TFLAG_INV|SSL_TFLAG_SERVER, flag}
  63 #define SSL_FLAG_TBL_CERT(str, flag) \
  64         {str, (int)(sizeof(str) - 1), SSL_TFLAG_CERT|SSL_TFLAG_BOTH, flag}
  65
  66 #define SSL_FLAG_VFY_CLI(str, flag) \
  67         {str, (int)(sizeof(str) - 1), SSL_TFLAG_VFY | SSL_TFLAG_CLIENT, flag}
  68 #define SSL_FLAG_VFY_SRV(str, flag) \
  69         {str, (int)(sizeof(str) - 1), SSL_TFLAG_VFY | SSL_TFLAG_SERVER, flag}
  70
  71 /*
  72  * Opaque structure containing SSL configuration context.
  73  */
  74
  75 struct ssl_conf_ctx_st {
  76     /*
  77      * Various flags indicating (among other things) which options we will
  78      * recognise.
  79      */
  80     unsigned int flags;
  81     /* Prefix and length of commands */
  82     char *prefix;
  83     size_t prefixlen;
  84     /* SSL_CTX or SSL structure to perform operations on */
  85     SSL_CTX *ctx;
  86     SSL *ssl;
  87     /* Pointer to SSL or SSL_CTX options field or NULL if none */
  88     uint32_t *poptions;
  89     /* Certificate filenames for each type */
  90     char *cert_filename[SSL_PKEY_NUM];
  91     /* Pointer to SSL or SSL_CTX cert_flags or NULL if none */
  92     uint32_t *pcert_flags;
  93     /* Pointer to SSL or SSL_CTX verify_mode or NULL if none */
  94     uint32_t *pvfy_flags;
  95     /* Pointer to SSL or SSL_CTX min_version field or NULL if none */
  96     int *min_version;
  97     /* Pointer to SSL or SSL_CTX max_version field or NULL if none */
  98     int *max_version;
  99     /* Current flag table being worked on */
 100     const ssl_flag_tbl *tbl;
 101     /* Size of table */
 102     size_t ntbl;
 103     /* Client CA names */
 104     STACK_OF(X509_NAME) *canames;
 105 };
 106
 107 static void ssl_set_option(SSL_CONF_CTX *cctx, unsigned int name_flags,
 108                            unsigned long option_value, int onoff)
 109 {
 110     uint32_t *pflags;
 111     if (cctx->poptions == NULL)
 112         return;
 113     if (name_flags & SSL_TFLAG_INV)
 114         onoff ^= 1;
 115     switch (name_flags & SSL_TFLAG_TYPE_MASK) {
 116
 117     case SSL_TFLAG_CERT:
 118         pflags = cctx->pcert_flags;
 119         break;
 120
 121     case SSL_TFLAG_VFY:
 122         pflags = cctx->pvfy_flags;
 123         break;
 124
 125     case SSL_TFLAG_OPTION:
 126         pflags = cctx->poptions;
 127         break;
 128
 129     default:
 130         return;
 131
 132     }
 133     if (onoff)
 134         *pflags |= option_value;
 135     else
 136         *pflags &= ~option_value;
 137 }
 138
 139 static int ssl_match_option(SSL_CONF_CTX *cctx, const ssl_flag_tbl *tbl,
 140                             const char *name, int namelen, int onoff)
 141 {
 142     /* If name not relevant for context skip */
 143     if (!(cctx->flags & tbl->name_flags & SSL_TFLAG_BOTH))
 144         return 0;
 145     if (namelen == -1) {
 146         if (strcmp(tbl->name, name))
 147             return 0;
 148     } else if (tbl->namelen != namelen || strncasecmp(tbl->name, name, namelen))
 149         return 0;
 150     ssl_set_option(cctx, tbl->name_flags, tbl->option_value, onoff);
 151     return 1;
 152 }
 153
 154 static int ssl_set_option_list(const char *elem, int len, void *usr)
 155 {
 156     SSL_CONF_CTX *cctx = usr;
 157     size_t i;
 158     const ssl_flag_tbl *tbl;
 159     int onoff = 1;
 160     /*
 161      * len == -1 indicates not being called in list context, just for single
 162      * command line switches, so don't allow +, -.
 163      */
 164     if (elem == NULL)
 165         return 0;
 166     if (len != -1) {
 167         if (*elem == '+') {
 168             elem++;
 169             len--;
 170             onoff = 1;
 171         } else if (*elem == '-') {
 172             elem++;
 173             len--;
 174             onoff = 0;
 175         }
 176     }
 177     for (i = 0, tbl = cctx->tbl; i < cctx->ntbl; i++, tbl++) {
 178         if (ssl_match_option(cctx, tbl, elem, len, onoff))
 179             return 1;
 180     }
 181     return 0;
 182 }
 183
 184 /* Set supported signature algorithms */
 185 static int cmd_SignatureAlgorithms(SSL_CONF_CTX *cctx, const char *value)
 186 {
 187     int rv;
 188     if (cctx->ssl)
 189         rv = SSL_set1_sigalgs_list(cctx->ssl, value);
 190     /* NB: ctx == NULL performs syntax checking only */
 191     else
 192         rv = SSL_CTX_set1_sigalgs_list(cctx->ctx, value);
 193     return rv > 0;
 194 }
 195
 196 /* Set supported client signature algorithms */
 197 static int cmd_ClientSignatureAlgorithms(SSL_CONF_CTX *cctx, const char *value)
 198 {
 199     int rv;
 200     if (cctx->ssl)
 201         rv = SSL_set1_client_sigalgs_list(cctx->ssl, value);
 202     /* NB: ctx == NULL performs syntax checking only */
 203     else
 204         rv = SSL_CTX_set1_client_sigalgs_list(cctx->ctx, value);
 205     return rv > 0;
 206 }
 207
 208 static int cmd_Groups(SSL_CONF_CTX *cctx, const char *value)
 209 {
 210     int rv;
 211     if (cctx->ssl)
 212         rv = SSL_set1_groups_list(cctx->ssl, value);
 213     /* NB: ctx == NULL performs syntax checking only */
 214     else
 215         rv = SSL_CTX_set1_groups_list(cctx->ctx, value);
 216     return rv > 0;
 217 }
 218
 219 /* This is the old name for cmd_Groups - retained for backwards compatibility */
 220 static int cmd_Curves(SSL_CONF_CTX *cctx, const char *value)
 221 {
 222     return cmd_Groups(cctx, value);
 223 }
 224
 225 #ifndef OPENSSL_NO_EC
 226 /* ECDH temporary parameters */
 227 static int cmd_ECDHParameters(SSL_CONF_CTX *cctx, const char *value)
 228 {
 229     int rv = 1;
 230     int nid;
 231
 232     /* Ignore values supported by 1.0.2 for the automatic selection */
 233     if ((cctx->flags & SSL_CONF_FLAG_FILE)
 234             && (strcasecmp(value, "+automatic") == 0
 235                 || strcasecmp(value, "automatic") == 0))
 236         return 1;
 237     if ((cctx->flags & SSL_CONF_FLAG_CMDLINE) &&
 238         strcmp(value, "auto") == 0)
 239         return 1;
 240
 241     nid = EC_curve_nist2nid(value);
 242     if (nid == NID_undef)
 243         nid = OBJ_sn2nid(value);
 244     if (nid == 0)
 245         return 0;
 246
 247     if (cctx->ctx)
 248         rv = SSL_CTX_set1_groups(cctx->ctx, &nid, 1);
 249     else if (cctx->ssl)
 250         rv = SSL_set1_groups(cctx->ssl, &nid, 1);
 251
 252     return rv > 0;
 253 }
 254 #endif
 255 static int cmd_CipherString(SSL_CONF_CTX *cctx, const char *value)
 256 {
 257     int rv = 1;
 258
 259     if (cctx->ctx)
 260         rv = SSL_CTX_set_cipher_list(cctx->ctx, value);
 261     if (cctx->ssl)
 262         rv = SSL_set_cipher_list(cctx->ssl, value);
 263     return rv > 0;
 264 }
 265
 266 static int cmd_Ciphersuites(SSL_CONF_CTX *cctx, const char *value)
 267 {
 268     int rv = 1;
 269
 270     if (cctx->ctx)
 271         rv = SSL_CTX_set_ciphersuites(cctx->ctx, value);
 272     if (cctx->ssl)
 273         rv = SSL_set_ciphersuites(cctx->ssl, value);
 274     return rv > 0;
 275 }
 276
 277 static int cmd_Protocol(SSL_CONF_CTX *cctx, const char *value)
 278 {
 279     static const ssl_flag_tbl ssl_protocol_list[] = {
 280         SSL_FLAG_TBL_INV("ALL", SSL_OP_NO_SSL_MASK),
 281         SSL_FLAG_TBL_INV("SSLv2", SSL_OP_NO_SSLv2),
 282         SSL_FLAG_TBL_INV("SSLv3", SSL_OP_NO_SSLv3),
 283         SSL_FLAG_TBL_INV("TLSv1", SSL_OP_NO_TLSv1),
 284         SSL_FLAG_TBL_INV("TLSv1.1", SSL_OP_NO_TLSv1_1),
 285         SSL_FLAG_TBL_INV("TLSv1.2", SSL_OP_NO_TLSv1_2),
 286         SSL_FLAG_TBL_INV("TLSv1.3", SSL_OP_NO_TLSv1_3),
 287         SSL_FLAG_TBL_INV("DTLSv1", SSL_OP_NO_DTLSv1),
 288         SSL_FLAG_TBL_INV("DTLSv1.2", SSL_OP_NO_DTLSv1_2)
 289     };
 290     cctx->tbl = ssl_protocol_list;
 291     cctx->ntbl = OSSL_NELEM(ssl_protocol_list);
 292     return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
 293 }
 294
 295 /*
 296  * protocol_from_string - converts a protocol version string to a number
 297  *
 298  * Returns -1 on failure or the version on success
 299  */
 300 static int protocol_from_string(const char *value)
 301 {
 302     struct protocol_versions {
 303         const char *name;
 304         int version;
 305     };
 306     static const struct protocol_versions versions[] = {
 307         {"None", 0},
 308         {"SSLv3", SSL3_VERSION},
 309         {"TLSv1", TLS1_VERSION},
 310         {"TLSv1.1", TLS1_1_VERSION},
 311         {"TLSv1.2", TLS1_2_VERSION},
 312         {"TLSv1.3", TLS1_3_VERSION},
 313         {"DTLSv1", DTLS1_VERSION},
 314         {"DTLSv1.2", DTLS1_2_VERSION}
 315     };
 316     size_t i;
 317     size_t n = OSSL_NELEM(versions);
 318
 319     for (i = 0; i < n; i++)
 320         if (strcmp(versions[i].name, value) == 0)
 321             return versions[i].version;
 322     return -1;
 323 }
 324
 325 static int min_max_proto(SSL_CONF_CTX *cctx, const char *value, int *bound)
 326 {
 327     int method_version;
 328     int new_version;
 329
 330     if (cctx->ctx != NULL)
 331         method_version = cctx->ctx->method->version;
 332     else if (cctx->ssl != NULL)
 333         method_version = cctx->ssl->ctx->method->version;
 334     else
 335         return 0;
 336     if ((new_version = protocol_from_string(value)) < 0)
 337         return 0;
 338     return ssl_set_version_bound(method_version, new_version, bound);
 339 }
 340
 341 /*
 342  * cmd_MinProtocol - Set min protocol version
 343  * @cctx: config structure to save settings in
 344  * @value: The min protocol version in string form
 345  *
 346  * Returns 1 on success and 0 on failure.
 347  */
 348 static int cmd_MinProtocol(SSL_CONF_CTX *cctx, const char *value)
 349 {
 350     return min_max_proto(cctx, value, cctx->min_version);
 351 }
 352
 353 /*
 354  * cmd_MaxProtocol - Set max protocol version
 355  * @cctx: config structure to save settings in
 356  * @value: The max protocol version in string form
 357  *
 358  * Returns 1 on success and 0 on failure.
 359  */
 360 static int cmd_MaxProtocol(SSL_CONF_CTX *cctx, const char *value)
 361 {
 362     return min_max_proto(cctx, value, cctx->max_version);
 363 }
 364
 365 static int cmd_Options(SSL_CONF_CTX *cctx, const char *value)
 366 {
 367     static const ssl_flag_tbl ssl_option_list[] = {
 368         SSL_FLAG_TBL_INV("SessionTicket", SSL_OP_NO_TICKET),
 369         SSL_FLAG_TBL_INV("EmptyFragments",
 370                          SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS),
 371         SSL_FLAG_TBL("Bugs", SSL_OP_ALL),
 372         SSL_FLAG_TBL_INV("Compression", SSL_OP_NO_COMPRESSION),
 373         SSL_FLAG_TBL_SRV("ServerPreference", SSL_OP_CIPHER_SERVER_PREFERENCE),
 374         SSL_FLAG_TBL_SRV("NoResumptionOnRenegotiation",
 375                          SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION),
 376         SSL_FLAG_TBL_SRV("DHSingle", SSL_OP_SINGLE_DH_USE),
 377         SSL_FLAG_TBL_SRV("ECDHSingle", SSL_OP_SINGLE_ECDH_USE),
 378         SSL_FLAG_TBL("UnsafeLegacyRenegotiation",
 379                      SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION),
 380         SSL_FLAG_TBL_INV("EncryptThenMac", SSL_OP_NO_ENCRYPT_THEN_MAC),
 381         SSL_FLAG_TBL("NoRenegotiation", SSL_OP_NO_RENEGOTIATION),
 382         SSL_FLAG_TBL("AllowNoDHEKEX", SSL_OP_ALLOW_NO_DHE_KEX),
 383         SSL_FLAG_TBL("PrioritizeChaCha", SSL_OP_PRIORITIZE_CHACHA),
 384         SSL_FLAG_TBL("MiddleboxCompat", SSL_OP_ENABLE_MIDDLEBOX_COMPAT),
 385         SSL_FLAG_TBL_INV("AntiReplay", SSL_OP_NO_ANTI_REPLAY),
 386         SSL_FLAG_TBL_INV("ExtendedMasterSecret", SSL_OP_NO_EXTENDED_MASTER_SECRET),
 387         SSL_FLAG_TBL_INV("CANames", SSL_OP_DISABLE_TLSEXT_CA_NAMES)
 388     };
 389     if (value == NULL)
 390         return -3;
 391     cctx->tbl = ssl_option_list;
 392     cctx->ntbl = OSSL_NELEM(ssl_option_list);
 393     return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
 394 }
 395
 396 static int cmd_VerifyMode(SSL_CONF_CTX *cctx, const char *value)
 397 {
 398     static const ssl_flag_tbl ssl_vfy_list[] = {
 399         SSL_FLAG_VFY_CLI("Peer", SSL_VERIFY_PEER),
 400         SSL_FLAG_VFY_SRV("Request", SSL_VERIFY_PEER),
 401         SSL_FLAG_VFY_SRV("Require",
 402                          SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT),
 403         SSL_FLAG_VFY_SRV("Once", SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE),
 404         SSL_FLAG_VFY_SRV("RequestPostHandshake",
 405                          SSL_VERIFY_PEER | SSL_VERIFY_POST_HANDSHAKE),
 406         SSL_FLAG_VFY_SRV("RequirePostHandshake",
 407                          SSL_VERIFY_PEER | SSL_VERIFY_POST_HANDSHAKE |
 408                          SSL_VERIFY_FAIL_IF_NO_PEER_CERT),
 409     };
 410     if (value == NULL)
 411         return -3;
 412     cctx->tbl = ssl_vfy_list;
 413     cctx->ntbl = OSSL_NELEM(ssl_vfy_list);
 414     return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
 415 }
 416
 417 static int cmd_Certificate(SSL_CONF_CTX *cctx, const char *value)
 418 {
 419     int rv = 1;
 420     CERT *c = NULL;
 421     if (cctx->ctx) {
 422         rv = SSL_CTX_use_certificate_chain_file(cctx->ctx, value);
 423         c = cctx->ctx->cert;
 424     }
 425     if (cctx->ssl) {
 426         rv = SSL_use_certificate_chain_file(cctx->ssl, value);
 427         c = cctx->ssl->cert;
 428     }
 429     if (rv > 0 && c && cctx->flags & SSL_CONF_FLAG_REQUIRE_PRIVATE) {
 430         char **pfilename = &cctx->cert_filename[c->key - c->pkeys];
 431         OPENSSL_free(*pfilename);
 432         *pfilename = OPENSSL_strdup(value);
 433         if (*pfilename == NULL)
 434             rv = 0;
 435     }
 436
 437     return rv > 0;
 438 }
 439
 440 static int cmd_PrivateKey(SSL_CONF_CTX *cctx, const char *value)
 441 {
 442     int rv = 1;
 443     if (!(cctx->flags & SSL_CONF_FLAG_CERTIFICATE))
 444         return -2;
 445     if (cctx->ctx)
 446         rv = SSL_CTX_use_PrivateKey_file(cctx->ctx, value, SSL_FILETYPE_PEM);
 447     if (cctx->ssl)
 448         rv = SSL_use_PrivateKey_file(cctx->ssl, value, SSL_FILETYPE_PEM);
 449     return rv > 0;
 450 }
 451
 452 static int cmd_ServerInfoFile(SSL_CONF_CTX *cctx, const char *value)
 453 {
 454     int rv = 1;
 455     if (cctx->ctx)
 456         rv = SSL_CTX_use_serverinfo_file(cctx->ctx, value);
 457     return rv > 0;
 458 }
 459
 460 static int do_store(SSL_CONF_CTX *cctx,
 461                     const char *CAfile, const char *CApath, const char *CAstore,
 462                     int verify_store)
 463 {
 464     CERT *cert;
 465     X509_STORE **st;
 466
 467     if (cctx->ctx)
 468         cert = cctx->ctx->cert;
 469     else if (cctx->ssl)
 470         cert = cctx->ssl->cert;
 471     else
 472         return 1;
 473     st = verify_store ? &cert->verify_store : &cert->chain_store;
 474     if (*st == NULL) {
 475         *st = X509_STORE_new();
 476         if (*st == NULL)
 477             return 0;
 478     }
 479
 480     if (CAfile != NULL && !X509_STORE_load_file(*st, CAfile))
 481         return 0;
 482     if (CApath != NULL && !X509_STORE_load_path(*st, CApath))
 483         return 0;
 484     if (CAstore != NULL && !X509_STORE_load_store(*st, CAstore))
 485         return 0;
 486     return 1;
 487 }
 488
 489 static int cmd_ChainCAPath(SSL_CONF_CTX *cctx, const char *value)
 490 {
 491     return do_store(cctx, NULL, value, NULL, 0);
 492 }
 493
 494 static int cmd_ChainCAFile(SSL_CONF_CTX *cctx, const char *value)
 495 {
 496     return do_store(cctx, value, NULL, NULL, 0);
 497 }
 498
 499 static int cmd_ChainCAStore(SSL_CONF_CTX *cctx, const char *value)
 500 {
 501     return do_store(cctx, NULL, NULL, value, 0);
 502 }
 503
 504 static int cmd_VerifyCAPath(SSL_CONF_CTX *cctx, const char *value)
 505 {
 506     return do_store(cctx, NULL, value, NULL, 1);
 507 }
 508
 509 static int cmd_VerifyCAFile(SSL_CONF_CTX *cctx, const char *value)
 510 {
 511     return do_store(cctx, value, NULL, NULL, 1);
 512 }
 513
 514 static int cmd_VerifyCAStore(SSL_CONF_CTX *cctx, const char *value)
 515 {
 516     return do_store(cctx, NULL, NULL, value, 1);
 517 }
 518
 519 static int cmd_RequestCAFile(SSL_CONF_CTX *cctx, const char *value)
 520 {
 521     if (cctx->canames == NULL)
 522         cctx->canames = sk_X509_NAME_new_null();
 523     if (cctx->canames == NULL)
 524         return 0;
 525     return SSL_add_file_cert_subjects_to_stack(cctx->canames, value);
 526 }
 527
 528 static int cmd_ClientCAFile(SSL_CONF_CTX *cctx, const char *value)
 529 {
 530     return cmd_RequestCAFile(cctx, value);
 531 }
 532
 533 static int cmd_RequestCAPath(SSL_CONF_CTX *cctx, const char *value)
 534 {
 535     if (cctx->canames == NULL)
 536         cctx->canames = sk_X509_NAME_new_null();
 537     if (cctx->canames == NULL)
 538         return 0;
 539     return SSL_add_dir_cert_subjects_to_stack(cctx->canames, value);
 540 }
 541
 542 static int cmd_ClientCAPath(SSL_CONF_CTX *cctx, const char *value)
 543 {
 544     return cmd_RequestCAPath(cctx, value);
 545 }
 546
 547 static int cmd_RequestCAStore(SSL_CONF_CTX *cctx, const char *value)
 548 {
 549     if (cctx->canames == NULL)
 550         cctx->canames = sk_X509_NAME_new_null();
 551     if (cctx->canames == NULL)
 552         return 0;
 553     return SSL_add_store_cert_subjects_to_stack(cctx->canames, value);
 554 }
 555
 556 static int cmd_ClientCAStore(SSL_CONF_CTX *cctx, const char *value)
 557 {
 558     return cmd_RequestCAStore(cctx, value);
 559 }
 560
 561 #ifndef OPENSSL_NO_DH
 562 static int cmd_DHParameters(SSL_CONF_CTX *cctx, const char *value)
 563 {
 564     int rv = 0;
 565     DH *dh = NULL;
 566     BIO *in = NULL;
 567     if (cctx->ctx || cctx->ssl) {
 568         in = BIO_new(BIO_s_file());
 569         if (in == NULL)
 570             goto end;
 571         if (BIO_read_filename(in, value) <= 0)
 572             goto end;
 573         dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL);
 574         if (dh == NULL)
 575             goto end;
 576     } else
 577         return 1;
 578     if (cctx->ctx)
 579         rv = SSL_CTX_set_tmp_dh(cctx->ctx, dh);
 580     if (cctx->ssl)
 581         rv = SSL_set_tmp_dh(cctx->ssl, dh);
 582  end:
 583     DH_free(dh);
 584     BIO_free(in);
 585     return rv > 0;
 586 }
 587 #endif
 588
 589 static int cmd_RecordPadding(SSL_CONF_CTX *cctx, const char *value)
 590 {
 591     int rv = 0;
 592     int block_size = atoi(value);
 593
 594     /*
 595      * All we care about is a non-negative value,
 596      * the setters check the range
 597      */
 598     if (block_size >= 0) {
 599         if (cctx->ctx)
 600             rv = SSL_CTX_set_block_padding(cctx->ctx, block_size);
 601         if (cctx->ssl)
 602             rv = SSL_set_block_padding(cctx->ssl, block_size);
 603     }
 604     return rv;
 605 }
 606
 607
 608 static int cmd_NumTickets(SSL_CONF_CTX *cctx, const char *value)
 609 {
 610     int rv = 0;
 611     int num_tickets = atoi(value);
 612
 613     if (num_tickets >= 0) {
 614         if (cctx->ctx)
 615             rv = SSL_CTX_set_num_tickets(cctx->ctx, num_tickets);
 616         if (cctx->ssl)
 617             rv = SSL_set_num_tickets(cctx->ssl, num_tickets);
 618     }
 619     return rv;
 620 }
 621
 622 typedef struct {
 623     int (*cmd) (SSL_CONF_CTX *cctx, const char *value);
 624     const char *str_file;
 625     const char *str_cmdline;
 626     unsigned short flags;
 627     unsigned short value_type;
 628 } ssl_conf_cmd_tbl;
 629
 630 /* Table of supported parameters */
 631
 632 #define SSL_CONF_CMD(name, cmdopt, flags, type) \
 633         {cmd_##name, #name, cmdopt, flags, type}
 634
 635 #define SSL_CONF_CMD_STRING(name, cmdopt, flags) \
 636         SSL_CONF_CMD(name, cmdopt, flags, SSL_CONF_TYPE_STRING)
 637
 638 #define SSL_CONF_CMD_SWITCH(name, flags) \
 639         {0, NULL, name, flags, SSL_CONF_TYPE_NONE}
 640
 641 /* See apps/apps.h if you change this table. */
 642 static const ssl_conf_cmd_tbl ssl_conf_cmds[] = {
 643     SSL_CONF_CMD_SWITCH("no_ssl3", 0),
 644     SSL_CONF_CMD_SWITCH("no_tls1", 0),
 645     SSL_CONF_CMD_SWITCH("no_tls1_1", 0),
 646     SSL_CONF_CMD_SWITCH("no_tls1_2", 0),
 647     SSL_CONF_CMD_SWITCH("no_tls1_3", 0),
 648     SSL_CONF_CMD_SWITCH("bugs", 0),
 649     SSL_CONF_CMD_SWITCH("no_comp", 0),
 650     SSL_CONF_CMD_SWITCH("comp", 0),
 651     SSL_CONF_CMD_SWITCH("ecdh_single", SSL_CONF_FLAG_SERVER),
 652     SSL_CONF_CMD_SWITCH("no_ticket", 0),
 653     SSL_CONF_CMD_SWITCH("serverpref", SSL_CONF_FLAG_SERVER),
 654     SSL_CONF_CMD_SWITCH("legacy_renegotiation", 0),
 655     SSL_CONF_CMD_SWITCH("legacy_server_connect", SSL_CONF_FLAG_SERVER),
 656     SSL_CONF_CMD_SWITCH("no_renegotiation", 0),
 657     SSL_CONF_CMD_SWITCH("no_resumption_on_reneg", SSL_CONF_FLAG_SERVER),
 658     SSL_CONF_CMD_SWITCH("no_legacy_server_connect", SSL_CONF_FLAG_SERVER),
 659     SSL_CONF_CMD_SWITCH("allow_no_dhe_kex", 0),
 660     SSL_CONF_CMD_SWITCH("prioritize_chacha", SSL_CONF_FLAG_SERVER),
 661     SSL_CONF_CMD_SWITCH("strict", 0),
 662     SSL_CONF_CMD_SWITCH("no_middlebox", 0),
 663     SSL_CONF_CMD_SWITCH("anti_replay", SSL_CONF_FLAG_SERVER),
 664     SSL_CONF_CMD_SWITCH("no_anti_replay", SSL_CONF_FLAG_SERVER),
 665     SSL_CONF_CMD_STRING(SignatureAlgorithms, "sigalgs", 0),
 666     SSL_CONF_CMD_STRING(ClientSignatureAlgorithms, "client_sigalgs", 0),
 667     SSL_CONF_CMD_STRING(Curves, "curves", 0),
 668     SSL_CONF_CMD_STRING(Groups, "groups", 0),
 669 #ifndef OPENSSL_NO_EC
 670     SSL_CONF_CMD_STRING(ECDHParameters, "named_curve", SSL_CONF_FLAG_SERVER),
 671 #endif
 672     SSL_CONF_CMD_STRING(CipherString, "cipher", 0),
 673     SSL_CONF_CMD_STRING(Ciphersuites, "ciphersuites", 0),
 674     SSL_CONF_CMD_STRING(Protocol, NULL, 0),
 675     SSL_CONF_CMD_STRING(MinProtocol, "min_protocol", 0),
 676     SSL_CONF_CMD_STRING(MaxProtocol, "max_protocol", 0),
 677     SSL_CONF_CMD_STRING(Options, NULL, 0),
 678     SSL_CONF_CMD_STRING(VerifyMode, NULL, 0),
 679     SSL_CONF_CMD(Certificate, "cert", SSL_CONF_FLAG_CERTIFICATE,
 680                  SSL_CONF_TYPE_FILE),
 681     SSL_CONF_CMD(PrivateKey, "key", SSL_CONF_FLAG_CERTIFICATE,
 682                  SSL_CONF_TYPE_FILE),
 683     SSL_CONF_CMD(ServerInfoFile, NULL,
 684                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 685                  SSL_CONF_TYPE_FILE),
 686     SSL_CONF_CMD(ChainCAPath, "chainCApath", SSL_CONF_FLAG_CERTIFICATE,
 687                  SSL_CONF_TYPE_DIR),
 688     SSL_CONF_CMD(ChainCAFile, "chainCAfile", SSL_CONF_FLAG_CERTIFICATE,
 689                  SSL_CONF_TYPE_FILE),
 690     SSL_CONF_CMD(ChainCAStore, "chainCAstore", SSL_CONF_FLAG_CERTIFICATE,
 691                  SSL_CONF_TYPE_STORE),
 692     SSL_CONF_CMD(VerifyCAPath, "verifyCApath", SSL_CONF_FLAG_CERTIFICATE,
 693                  SSL_CONF_TYPE_DIR),
 694     SSL_CONF_CMD(VerifyCAFile, "verifyCAfile", SSL_CONF_FLAG_CERTIFICATE,
 695                  SSL_CONF_TYPE_FILE),
 696     SSL_CONF_CMD(VerifyCAStore, "verifyCAstore", SSL_CONF_FLAG_CERTIFICATE,
 697                  SSL_CONF_TYPE_STORE),
 698     SSL_CONF_CMD(RequestCAFile, "requestCAFile", SSL_CONF_FLAG_CERTIFICATE,
 699                  SSL_CONF_TYPE_FILE),
 700     SSL_CONF_CMD(ClientCAFile, NULL,
 701                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 702                  SSL_CONF_TYPE_FILE),
 703     SSL_CONF_CMD(RequestCAPath, NULL, SSL_CONF_FLAG_CERTIFICATE,
 704                  SSL_CONF_TYPE_DIR),
 705     SSL_CONF_CMD(ClientCAPath, NULL,
 706                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 707                  SSL_CONF_TYPE_DIR),
 708     SSL_CONF_CMD(RequestCAStore, "requestCAStore", SSL_CONF_FLAG_CERTIFICATE,
 709                  SSL_CONF_TYPE_STORE),
 710     SSL_CONF_CMD(ClientCAStore, NULL,
 711                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 712                  SSL_CONF_TYPE_STORE),
 713 #ifndef OPENSSL_NO_DH
 714     SSL_CONF_CMD(DHParameters, "dhparam",
 715                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 716                  SSL_CONF_TYPE_FILE),
 717 #endif
 718     SSL_CONF_CMD_STRING(RecordPadding, "record_padding", 0),
 719     SSL_CONF_CMD_STRING(NumTickets, "num_tickets", SSL_CONF_FLAG_SERVER),
 720 };
 721
 722 /* Supported switches: must match order of switches in ssl_conf_cmds */
 723 static const ssl_switch_tbl ssl_cmd_switches[] = {
 724     {SSL_OP_NO_SSLv3, 0},       /* no_ssl3 */
 725     {SSL_OP_NO_TLSv1, 0},       /* no_tls1 */
 726     {SSL_OP_NO_TLSv1_1, 0},     /* no_tls1_1 */
 727     {SSL_OP_NO_TLSv1_2, 0},     /* no_tls1_2 */
 728     {SSL_OP_NO_TLSv1_3, 0},     /* no_tls1_3 */
 729     {SSL_OP_ALL, 0},            /* bugs */
 730     {SSL_OP_NO_COMPRESSION, 0}, /* no_comp */
 731     {SSL_OP_NO_COMPRESSION, SSL_TFLAG_INV}, /* comp */
 732     {SSL_OP_SINGLE_ECDH_USE, 0}, /* ecdh_single */
 733     {SSL_OP_NO_TICKET, 0},      /* no_ticket */
 734     {SSL_OP_CIPHER_SERVER_PREFERENCE, 0}, /* serverpref */
 735     /* legacy_renegotiation */
 736     {SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION, 0},
 737     /* legacy_server_connect */
 738     {SSL_OP_LEGACY_SERVER_CONNECT, 0},
 739     /* no_renegotiation */
 740     {SSL_OP_NO_RENEGOTIATION, 0},
 741     /* no_resumption_on_reneg */
 742     {SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION, 0},
 743     /* no_legacy_server_connect */
 744     {SSL_OP_LEGACY_SERVER_CONNECT, SSL_TFLAG_INV},
 745     /* allow_no_dhe_kex */
 746     {SSL_OP_ALLOW_NO_DHE_KEX, 0},
 747     /* chacha reprioritization */
 748     {SSL_OP_PRIORITIZE_CHACHA, 0},
 749     {SSL_CERT_FLAG_TLS_STRICT, SSL_TFLAG_CERT}, /* strict */
 750     /* no_middlebox */
 751     {SSL_OP_ENABLE_MIDDLEBOX_COMPAT, SSL_TFLAG_INV},
 752     /* anti_replay */
 753     {SSL_OP_NO_ANTI_REPLAY, SSL_TFLAG_INV},
 754     /* no_anti_replay */
 755     {SSL_OP_NO_ANTI_REPLAY, 0},
 756 };
 757
 758 static int ssl_conf_cmd_skip_prefix(SSL_CONF_CTX *cctx, const char **pcmd)
 759 {
 760     if (pcmd == NULL || *pcmd == NULL)
 761         return 0;
 762     /* If a prefix is set, check and skip */
 763     if (cctx->prefix) {
 764         if (strlen(*pcmd) <= cctx->prefixlen)
 765             return 0;
 766         if (cctx->flags & SSL_CONF_FLAG_CMDLINE &&
 767             strncmp(*pcmd, cctx->prefix, cctx->prefixlen))
 768             return 0;
 769         if (cctx->flags & SSL_CONF_FLAG_FILE &&
 770             strncasecmp(*pcmd, cctx->prefix, cctx->prefixlen))
 771             return 0;
 772         *pcmd += cctx->prefixlen;
 773     } else if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
 774         if (**pcmd != '-' || !(*pcmd)[1])
 775             return 0;
 776         *pcmd += 1;
 777     }
 778     return 1;
 779 }
 780
 781 /* Determine if a command is allowed according to cctx flags */
 782 static int ssl_conf_cmd_allowed(SSL_CONF_CTX *cctx, const ssl_conf_cmd_tbl * t)
 783 {
 784     unsigned int tfl = t->flags;
 785     unsigned int cfl = cctx->flags;
 786     if ((tfl & SSL_CONF_FLAG_SERVER) && !(cfl & SSL_CONF_FLAG_SERVER))
 787         return 0;
 788     if ((tfl & SSL_CONF_FLAG_CLIENT) && !(cfl & SSL_CONF_FLAG_CLIENT))
 789         return 0;
 790     if ((tfl & SSL_CONF_FLAG_CERTIFICATE)
 791         && !(cfl & SSL_CONF_FLAG_CERTIFICATE))
 792         return 0;
 793     return 1;
 794 }
 795
 796 static const ssl_conf_cmd_tbl *ssl_conf_cmd_lookup(SSL_CONF_CTX *cctx,
 797                                                    const char *cmd)
 798 {
 799     const ssl_conf_cmd_tbl *t;
 800     size_t i;
 801     if (cmd == NULL)
 802         return NULL;
 803
 804     /* Look for matching parameter name in table */
 805     for (i = 0, t = ssl_conf_cmds; i < OSSL_NELEM(ssl_conf_cmds); i++, t++) {
 806         if (ssl_conf_cmd_allowed(cctx, t)) {
 807             if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
 808                 if (t->str_cmdline && strcmp(t->str_cmdline, cmd) == 0)
 809                     return t;
 810             }
 811             if (cctx->flags & SSL_CONF_FLAG_FILE) {
 812                 if (t->str_file && strcasecmp(t->str_file, cmd) == 0)
 813                     return t;
 814             }
 815         }
 816     }
 817     return NULL;
 818 }
 819
 820 static int ctrl_switch_option(SSL_CONF_CTX *cctx, const ssl_conf_cmd_tbl * cmd)
 821 {
 822     /* Find index of command in table */
 823     size_t idx = cmd - ssl_conf_cmds;
 824     const ssl_switch_tbl *scmd;
 825     /* Sanity check index */
 826     if (idx >= OSSL_NELEM(ssl_cmd_switches))
 827         return 0;
 828     /* Obtain switches entry with same index */
 829     scmd = ssl_cmd_switches + idx;
 830     ssl_set_option(cctx, scmd->name_flags, scmd->option_value, 1);
 831     return 1;
 832 }
 833
 834 int SSL_CONF_cmd(SSL_CONF_CTX *cctx, const char *cmd, const char *value)
 835 {
 836     const ssl_conf_cmd_tbl *runcmd;
 837     if (cmd == NULL) {
 838         SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_INVALID_NULL_CMD_NAME);
 839         return 0;
 840     }
 841
 842     if (!ssl_conf_cmd_skip_prefix(cctx, &cmd))
 843         return -2;
 844
 845     runcmd = ssl_conf_cmd_lookup(cctx, cmd);
 846
 847     if (runcmd) {
 848         int rv;
 849         if (runcmd->value_type == SSL_CONF_TYPE_NONE) {
 850             return ctrl_switch_option(cctx, runcmd);
 851         }
 852         if (value == NULL)
 853             return -3;
 854         rv = runcmd->cmd(cctx, value);
 855         if (rv > 0)
 856             return 2;
 857         if (rv == -2)
 858             return -2;
 859         if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS) {
 860             SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_BAD_VALUE);
 861             ERR_add_error_data(4, "cmd=", cmd, ", value=", value);
 862         }
 863         return 0;
 864     }
 865
 866     if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS) {
 867         SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_UNKNOWN_CMD_NAME);
 868         ERR_add_error_data(2, "cmd=", cmd);
 869     }
 870
 871     return -2;
 872 }
 873
 874 int SSL_CONF_cmd_argv(SSL_CONF_CTX *cctx, int *pargc, char ***pargv)
 875 {
 876     int rv;
 877     const char *arg = NULL, *argn;
 878
 879     if (pargc != NULL && *pargc == 0)
 880         return 0;
 881     if (pargc == NULL || *pargc > 0)
 882         arg = **pargv;
 883     if (arg == NULL)
 884         return 0;
 885     if (pargc == NULL || *pargc > 1)
 886         argn = (*pargv)[1];
 887     else
 888         argn = NULL;
 889     cctx->flags &= ~SSL_CONF_FLAG_FILE;
 890     cctx->flags |= SSL_CONF_FLAG_CMDLINE;
 891     rv = SSL_CONF_cmd(cctx, arg, argn);
 892     if (rv > 0) {
 893         /* Success: update pargc, pargv */
 894         (*pargv) += rv;
 895         if (pargc)
 896             (*pargc) -= rv;
 897         return rv;
 898     }
 899     /* Unknown switch: indicate no arguments processed */
 900     if (rv == -2)
 901         return 0;
 902     /* Some error occurred processing command, return fatal error */
 903     if (rv == 0)
 904         return -1;
 905     return rv;
 906 }
 907
 908 int SSL_CONF_cmd_value_type(SSL_CONF_CTX *cctx, const char *cmd)
 909 {
 910     if (ssl_conf_cmd_skip_prefix(cctx, &cmd)) {
 911         const ssl_conf_cmd_tbl *runcmd;
 912         runcmd = ssl_conf_cmd_lookup(cctx, cmd);
 913         if (runcmd)
 914             return runcmd->value_type;
 915     }
 916     return SSL_CONF_TYPE_UNKNOWN;
 917 }
 918
 919 SSL_CONF_CTX *SSL_CONF_CTX_new(void)
 920 {
 921     SSL_CONF_CTX *ret = OPENSSL_zalloc(sizeof(*ret));
 922
 923     return ret;
 924 }
 925
 926 int SSL_CONF_CTX_finish(SSL_CONF_CTX *cctx)
 927 {
 928     /* See if any certificates are missing private keys */
 929     size_t i;
 930     CERT *c = NULL;
 931     if (cctx->ctx)
 932         c = cctx->ctx->cert;
 933     else if (cctx->ssl)
 934         c = cctx->ssl->cert;
 935     if (c && cctx->flags & SSL_CONF_FLAG_REQUIRE_PRIVATE) {
 936         for (i = 0; i < SSL_PKEY_NUM; i++) {
 937             const char *p = cctx->cert_filename[i];
 938             /*
 939              * If missing private key try to load one from certificate file
 940              */
 941             if (p && !c->pkeys[i].privatekey) {
 942                 if (!cmd_PrivateKey(cctx, p))
 943                     return 0;
 944             }
 945         }
 946     }
 947     if (cctx->canames) {
 948         if (cctx->ssl)
 949             SSL_set0_CA_list(cctx->ssl, cctx->canames);
 950         else if (cctx->ctx)
 951             SSL_CTX_set0_CA_list(cctx->ctx, cctx->canames);
 952         else
 953             sk_X509_NAME_pop_free(cctx->canames, X509_NAME_free);
 954         cctx->canames = NULL;
 955     }
 956     return 1;
 957 }
 958
 959 void SSL_CONF_CTX_free(SSL_CONF_CTX *cctx)
 960 {
 961     if (cctx) {
 962         size_t i;
 963         for (i = 0; i < SSL_PKEY_NUM; i++)
 964             OPENSSL_free(cctx->cert_filename[i]);
 965         OPENSSL_free(cctx->prefix);
 966         sk_X509_NAME_pop_free(cctx->canames, X509_NAME_free);
 967         OPENSSL_free(cctx);
 968     }
 969 }
 970
 971 unsigned int SSL_CONF_CTX_set_flags(SSL_CONF_CTX *cctx, unsigned int flags)
 972 {
 973     cctx->flags |= flags;
 974     return cctx->flags;
 975 }
 976
 977 unsigned int SSL_CONF_CTX_clear_flags(SSL_CONF_CTX *cctx, unsigned int flags)
 978 {
 979     cctx->flags &= ~flags;
 980     return cctx->flags;
 981 }
 982
 983 int SSL_CONF_CTX_set1_prefix(SSL_CONF_CTX *cctx, const char *pre)
 984 {
 985     char *tmp = NULL;
 986     if (pre) {
 987         tmp = OPENSSL_strdup(pre);
 988         if (tmp == NULL)
 989             return 0;
 990     }
 991     OPENSSL_free(cctx->prefix);
 992     cctx->prefix = tmp;
 993     if (tmp)
 994         cctx->prefixlen = strlen(tmp);
 995     else
 996         cctx->prefixlen = 0;
 997     return 1;
 998 }
 999
1000 void SSL_CONF_CTX_set_ssl(SSL_CONF_CTX *cctx, SSL *ssl)
1001 {
1002     cctx->ssl = ssl;
1003     cctx->ctx = NULL;
1004     if (ssl) {
1005         cctx->poptions = &ssl->options;
1006         cctx->min_version = &ssl->min_proto_version;
1007         cctx->max_version = &ssl->max_proto_version;
1008         cctx->pcert_flags = &ssl->cert->cert_flags;
1009         cctx->pvfy_flags = &ssl->verify_mode;
1010     } else {
1011         cctx->poptions = NULL;
1012         cctx->min_version = NULL;
1013         cctx->max_version = NULL;
1014         cctx->pcert_flags = NULL;
1015         cctx->pvfy_flags = NULL;
1016     }
1017 }
1018
1019 void SSL_CONF_CTX_set_ssl_ctx(SSL_CONF_CTX *cctx, SSL_CTX *ctx)
1020 {
1021     cctx->ctx = ctx;
1022     cctx->ssl = NULL;
1023     if (ctx) {
1024         cctx->poptions = &ctx->options;
1025         cctx->min_version = &ctx->min_proto_version;
1026         cctx->max_version = &ctx->max_proto_version;
1027         cctx->pcert_flags = &ctx->cert->cert_flags;
1028         cctx->pvfy_flags = &ctx->verify_mode;
1029     } else {
1030         cctx->poptions = NULL;
1031         cctx->min_version = NULL;
1032         cctx->max_version = NULL;
1033         cctx->pcert_flags = NULL;
1034         cctx->pvfy_flags = NULL;
1035     }
1036 }