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/decoder.h>
  15 #include <openssl/core_dispatch.h>
  16 #include "internal/nelem.h"
  17
  18 /*
  19  * structure holding name tables. This is used for permitted elements in lists
  20  * such as TLSv1.
  21  */
  22
  23 typedef struct {
  24     const char *name;
  25     int namelen;
  26     unsigned int name_flags;
  27     unsigned long option_value;
  28 } ssl_flag_tbl;
  29
  30 /* Switch table: use for single command line switches like no_tls2 */
  31 typedef struct {
  32     unsigned long option_value;
  33     unsigned int name_flags;
  34 } ssl_switch_tbl;
  35
  36 /* Sense of name is inverted e.g. "TLSv1" will clear SSL_OP_NO_TLSv1 */
  37 #define SSL_TFLAG_INV   0x1
  38 /* Mask for type of flag referred to */
  39 #define SSL_TFLAG_TYPE_MASK 0xf00
  40 /* Flag is for options */
  41 #define SSL_TFLAG_OPTION    0x000
  42 /* Flag is for cert_flags */
  43 #define SSL_TFLAG_CERT      0x100
  44 /* Flag is for verify mode */
  45 #define SSL_TFLAG_VFY       0x200
  46 /* Option can only be used for clients */
  47 #define SSL_TFLAG_CLIENT SSL_CONF_FLAG_CLIENT
  48 /* Option can only be used for servers */
  49 #define SSL_TFLAG_SERVER SSL_CONF_FLAG_SERVER
  50 #define SSL_TFLAG_BOTH (SSL_TFLAG_CLIENT|SSL_TFLAG_SERVER)
  51
  52 #define SSL_FLAG_TBL(str, flag) \
  53         {str, (int)(sizeof(str) - 1), SSL_TFLAG_BOTH, flag}
  54 #define SSL_FLAG_TBL_SRV(str, flag) \
  55         {str, (int)(sizeof(str) - 1), SSL_TFLAG_SERVER, flag}
  56 #define SSL_FLAG_TBL_CLI(str, flag) \
  57         {str, (int)(sizeof(str) - 1), SSL_TFLAG_CLIENT, flag}
  58 #define SSL_FLAG_TBL_INV(str, flag) \
  59         {str, (int)(sizeof(str) - 1), SSL_TFLAG_INV|SSL_TFLAG_BOTH, flag}
  60 #define SSL_FLAG_TBL_SRV_INV(str, flag) \
  61         {str, (int)(sizeof(str) - 1), SSL_TFLAG_INV|SSL_TFLAG_SERVER, flag}
  62 #define SSL_FLAG_TBL_CERT(str, flag) \
  63         {str, (int)(sizeof(str) - 1), SSL_TFLAG_CERT|SSL_TFLAG_BOTH, flag}
  64
  65 #define SSL_FLAG_VFY_CLI(str, flag) \
  66         {str, (int)(sizeof(str) - 1), SSL_TFLAG_VFY | SSL_TFLAG_CLIENT, flag}
  67 #define SSL_FLAG_VFY_SRV(str, flag) \
  68         {str, (int)(sizeof(str) - 1), SSL_TFLAG_VFY | SSL_TFLAG_SERVER, flag}
  69
  70 /*
  71  * Opaque structure containing SSL configuration context.
  72  */
  73
  74 struct ssl_conf_ctx_st {
  75     /*
  76      * Various flags indicating (among other things) which options we will
  77      * recognise.
  78      */
  79     unsigned int flags;
  80     /* Prefix and length of commands */
  81     char *prefix;
  82     size_t prefixlen;
  83     /* SSL_CTX or SSL structure to perform operations on */
  84     SSL_CTX *ctx;
  85     SSL *ssl;
  86     /* Pointer to SSL or SSL_CTX options field or NULL if none */
  87     uint32_t *poptions;
  88     /* Certificate filenames for each type */
  89     char *cert_filename[SSL_PKEY_NUM];
  90     /* Pointer to SSL or SSL_CTX cert_flags or NULL if none */
  91     uint32_t *pcert_flags;
  92     /* Pointer to SSL or SSL_CTX verify_mode or NULL if none */
  93     uint32_t *pvfy_flags;
  94     /* Pointer to SSL or SSL_CTX min_version field or NULL if none */
  95     int *min_version;
  96     /* Pointer to SSL or SSL_CTX max_version field or NULL if none */
  97     int *max_version;
  98     /* Current flag table being worked on */
  99     const ssl_flag_tbl *tbl;
 100     /* Size of table */
 101     size_t ntbl;
 102     /* Client CA names */
 103     STACK_OF(X509_NAME) *canames;
 104 };
 105
 106 static void ssl_set_option(SSL_CONF_CTX *cctx, unsigned int name_flags,
 107                            unsigned long option_value, int onoff)
 108 {
 109     uint32_t *pflags;
 110     if (cctx->poptions == NULL)
 111         return;
 112     if (name_flags & SSL_TFLAG_INV)
 113         onoff ^= 1;
 114     switch (name_flags & SSL_TFLAG_TYPE_MASK) {
 115
 116     case SSL_TFLAG_CERT:
 117         pflags = cctx->pcert_flags;
 118         break;
 119
 120     case SSL_TFLAG_VFY:
 121         pflags = cctx->pvfy_flags;
 122         break;
 123
 124     case SSL_TFLAG_OPTION:
 125         pflags = cctx->poptions;
 126         break;
 127
 128     default:
 129         return;
 130
 131     }
 132     if (onoff)
 133         *pflags |= option_value;
 134     else
 135         *pflags &= ~option_value;
 136 }
 137
 138 static int ssl_match_option(SSL_CONF_CTX *cctx, const ssl_flag_tbl *tbl,
 139                             const char *name, int namelen, int onoff)
 140 {
 141     /* If name not relevant for context skip */
 142     if (!(cctx->flags & tbl->name_flags & SSL_TFLAG_BOTH))
 143         return 0;
 144     if (namelen == -1) {
 145         if (strcmp(tbl->name, name))
 146             return 0;
 147     } else if (tbl->namelen != namelen || strncasecmp(tbl->name, name, namelen))
 148         return 0;
 149     ssl_set_option(cctx, tbl->name_flags, tbl->option_value, onoff);
 150     return 1;
 151 }
 152
 153 static int ssl_set_option_list(const char *elem, int len, void *usr)
 154 {
 155     SSL_CONF_CTX *cctx = usr;
 156     size_t i;
 157     const ssl_flag_tbl *tbl;
 158     int onoff = 1;
 159     /*
 160      * len == -1 indicates not being called in list context, just for single
 161      * command line switches, so don't allow +, -.
 162      */
 163     if (elem == NULL)
 164         return 0;
 165     if (len != -1) {
 166         if (*elem == '+') {
 167             elem++;
 168             len--;
 169             onoff = 1;
 170         } else if (*elem == '-') {
 171             elem++;
 172             len--;
 173             onoff = 0;
 174         }
 175     }
 176     for (i = 0, tbl = cctx->tbl; i < cctx->ntbl; i++, tbl++) {
 177         if (ssl_match_option(cctx, tbl, elem, len, onoff))
 178             return 1;
 179     }
 180     return 0;
 181 }
 182
 183 /* Set supported signature algorithms */
 184 static int cmd_SignatureAlgorithms(SSL_CONF_CTX *cctx, const char *value)
 185 {
 186     int rv;
 187     if (cctx->ssl)
 188         rv = SSL_set1_sigalgs_list(cctx->ssl, value);
 189     /* NB: ctx == NULL performs syntax checking only */
 190     else
 191         rv = SSL_CTX_set1_sigalgs_list(cctx->ctx, value);
 192     return rv > 0;
 193 }
 194
 195 /* Set supported client signature algorithms */
 196 static int cmd_ClientSignatureAlgorithms(SSL_CONF_CTX *cctx, const char *value)
 197 {
 198     int rv;
 199     if (cctx->ssl)
 200         rv = SSL_set1_client_sigalgs_list(cctx->ssl, value);
 201     /* NB: ctx == NULL performs syntax checking only */
 202     else
 203         rv = SSL_CTX_set1_client_sigalgs_list(cctx->ctx, value);
 204     return rv > 0;
 205 }
 206
 207 static int cmd_Groups(SSL_CONF_CTX *cctx, const char *value)
 208 {
 209     int rv;
 210     if (cctx->ssl)
 211         rv = SSL_set1_groups_list(cctx->ssl, value);
 212     /* NB: ctx == NULL performs syntax checking only */
 213     else
 214         rv = SSL_CTX_set1_groups_list(cctx->ctx, value);
 215     return rv > 0;
 216 }
 217
 218 /* This is the old name for cmd_Groups - retained for backwards compatibility */
 219 static int cmd_Curves(SSL_CONF_CTX *cctx, const char *value)
 220 {
 221     return cmd_Groups(cctx, value);
 222 }
 223
 224 /* ECDH temporary parameters */
 225 static int cmd_ECDHParameters(SSL_CONF_CTX *cctx, const char *value)
 226 {
 227     int rv = 1;
 228
 229     /* Ignore values supported by 1.0.2 for the automatic selection */
 230     if ((cctx->flags & SSL_CONF_FLAG_FILE)
 231             && (strcasecmp(value, "+automatic") == 0
 232                 || strcasecmp(value, "automatic") == 0))
 233         return 1;
 234     if ((cctx->flags & SSL_CONF_FLAG_CMDLINE) &&
 235         strcmp(value, "auto") == 0)
 236         return 1;
 237
 238     /* ECDHParameters accepts a single group name */
 239     if (strstr(value, ":") != NULL)
 240         return 0;
 241
 242     if (cctx->ctx)
 243         rv = SSL_CTX_set1_groups_list(cctx->ctx, value);
 244     else if (cctx->ssl)
 245         rv = SSL_set1_groups_list(cctx->ssl, value);
 246
 247     return rv > 0;
 248 }
 249
 250 static int cmd_CipherString(SSL_CONF_CTX *cctx, const char *value)
 251 {
 252     int rv = 1;
 253
 254     if (cctx->ctx)
 255         rv = SSL_CTX_set_cipher_list(cctx->ctx, value);
 256     if (cctx->ssl)
 257         rv = SSL_set_cipher_list(cctx->ssl, value);
 258     return rv > 0;
 259 }
 260
 261 static int cmd_Ciphersuites(SSL_CONF_CTX *cctx, const char *value)
 262 {
 263     int rv = 1;
 264
 265     if (cctx->ctx)
 266         rv = SSL_CTX_set_ciphersuites(cctx->ctx, value);
 267     if (cctx->ssl)
 268         rv = SSL_set_ciphersuites(cctx->ssl, value);
 269     return rv > 0;
 270 }
 271
 272 static int cmd_Protocol(SSL_CONF_CTX *cctx, const char *value)
 273 {
 274     static const ssl_flag_tbl ssl_protocol_list[] = {
 275         SSL_FLAG_TBL_INV("ALL", SSL_OP_NO_SSL_MASK),
 276         SSL_FLAG_TBL_INV("SSLv2", SSL_OP_NO_SSLv2),
 277         SSL_FLAG_TBL_INV("SSLv3", SSL_OP_NO_SSLv3),
 278         SSL_FLAG_TBL_INV("TLSv1", SSL_OP_NO_TLSv1),
 279         SSL_FLAG_TBL_INV("TLSv1.1", SSL_OP_NO_TLSv1_1),
 280         SSL_FLAG_TBL_INV("TLSv1.2", SSL_OP_NO_TLSv1_2),
 281         SSL_FLAG_TBL_INV("TLSv1.3", SSL_OP_NO_TLSv1_3),
 282         SSL_FLAG_TBL_INV("DTLSv1", SSL_OP_NO_DTLSv1),
 283         SSL_FLAG_TBL_INV("DTLSv1.2", SSL_OP_NO_DTLSv1_2)
 284     };
 285     cctx->tbl = ssl_protocol_list;
 286     cctx->ntbl = OSSL_NELEM(ssl_protocol_list);
 287     return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
 288 }
 289
 290 /*
 291  * protocol_from_string - converts a protocol version string to a number
 292  *
 293  * Returns -1 on failure or the version on success
 294  */
 295 static int protocol_from_string(const char *value)
 296 {
 297     struct protocol_versions {
 298         const char *name;
 299         int version;
 300     };
 301     /*
 302      * Note: To avoid breaking previously valid configurations, we must retain
 303      * legacy entries in this table even if the underlying protocol is no
 304      * longer supported.  This also means that the constants SSL3_VERSION, ...
 305      * need to be retained indefinitely.  This table can only grow, never
 306      * shrink.
 307      */
 308     static const struct protocol_versions versions[] = {
 309         {"None", 0},
 310         {"SSLv3", SSL3_VERSION},
 311         {"TLSv1", TLS1_VERSION},
 312         {"TLSv1.1", TLS1_1_VERSION},
 313         {"TLSv1.2", TLS1_2_VERSION},
 314         {"TLSv1.3", TLS1_3_VERSION},
 315         {"DTLSv1", DTLS1_VERSION},
 316         {"DTLSv1.2", DTLS1_2_VERSION}
 317     };
 318     size_t i;
 319     size_t n = OSSL_NELEM(versions);
 320
 321     for (i = 0; i < n; i++)
 322         if (strcmp(versions[i].name, value) == 0)
 323             return versions[i].version;
 324     return -1;
 325 }
 326
 327 static int min_max_proto(SSL_CONF_CTX *cctx, const char *value, int *bound)
 328 {
 329     int method_version;
 330     int new_version;
 331
 332     if (cctx->ctx != NULL)
 333         method_version = cctx->ctx->method->version;
 334     else if (cctx->ssl != NULL)
 335         method_version = cctx->ssl->ctx->method->version;
 336     else
 337         return 0;
 338     if ((new_version = protocol_from_string(value)) < 0)
 339         return 0;
 340     return ssl_set_version_bound(method_version, new_version, bound);
 341 }
 342
 343 /*
 344  * cmd_MinProtocol - Set min protocol version
 345  * @cctx: config structure to save settings in
 346  * @value: The min protocol version in string form
 347  *
 348  * Returns 1 on success and 0 on failure.
 349  */
 350 static int cmd_MinProtocol(SSL_CONF_CTX *cctx, const char *value)
 351 {
 352     return min_max_proto(cctx, value, cctx->min_version);
 353 }
 354
 355 /*
 356  * cmd_MaxProtocol - Set max protocol version
 357  * @cctx: config structure to save settings in
 358  * @value: The max protocol version in string form
 359  *
 360  * Returns 1 on success and 0 on failure.
 361  */
 362 static int cmd_MaxProtocol(SSL_CONF_CTX *cctx, const char *value)
 363 {
 364     return min_max_proto(cctx, value, cctx->max_version);
 365 }
 366
 367 static int cmd_Options(SSL_CONF_CTX *cctx, const char *value)
 368 {
 369     static const ssl_flag_tbl ssl_option_list[] = {
 370         SSL_FLAG_TBL_INV("SessionTicket", SSL_OP_NO_TICKET),
 371         SSL_FLAG_TBL_INV("EmptyFragments",
 372                          SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS),
 373         SSL_FLAG_TBL("Bugs", SSL_OP_ALL),
 374         SSL_FLAG_TBL_INV("Compression", SSL_OP_NO_COMPRESSION),
 375         SSL_FLAG_TBL_SRV("ServerPreference", SSL_OP_CIPHER_SERVER_PREFERENCE),
 376         SSL_FLAG_TBL_SRV("NoResumptionOnRenegotiation",
 377                          SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION),
 378         SSL_FLAG_TBL_SRV("DHSingle", SSL_OP_SINGLE_DH_USE),
 379         SSL_FLAG_TBL_SRV("ECDHSingle", SSL_OP_SINGLE_ECDH_USE),
 380         SSL_FLAG_TBL("UnsafeLegacyRenegotiation",
 381                      SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION),
 382         SSL_FLAG_TBL_INV("EncryptThenMac", SSL_OP_NO_ENCRYPT_THEN_MAC),
 383         SSL_FLAG_TBL("NoRenegotiation", SSL_OP_NO_RENEGOTIATION),
 384         SSL_FLAG_TBL("AllowNoDHEKEX", SSL_OP_ALLOW_NO_DHE_KEX),
 385         SSL_FLAG_TBL("PrioritizeChaCha", SSL_OP_PRIORITIZE_CHACHA),
 386         SSL_FLAG_TBL("MiddleboxCompat", SSL_OP_ENABLE_MIDDLEBOX_COMPAT),
 387         SSL_FLAG_TBL_INV("AntiReplay", SSL_OP_NO_ANTI_REPLAY),
 388         SSL_FLAG_TBL_INV("ExtendedMasterSecret", SSL_OP_NO_EXTENDED_MASTER_SECRET),
 389         SSL_FLAG_TBL_INV("CANames", SSL_OP_DISABLE_TLSEXT_CA_NAMES)
 390     };
 391     if (value == NULL)
 392         return -3;
 393     cctx->tbl = ssl_option_list;
 394     cctx->ntbl = OSSL_NELEM(ssl_option_list);
 395     return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
 396 }
 397
 398 static int cmd_VerifyMode(SSL_CONF_CTX *cctx, const char *value)
 399 {
 400     static const ssl_flag_tbl ssl_vfy_list[] = {
 401         SSL_FLAG_VFY_CLI("Peer", SSL_VERIFY_PEER),
 402         SSL_FLAG_VFY_SRV("Request", SSL_VERIFY_PEER),
 403         SSL_FLAG_VFY_SRV("Require",
 404                          SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT),
 405         SSL_FLAG_VFY_SRV("Once", SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE),
 406         SSL_FLAG_VFY_SRV("RequestPostHandshake",
 407                          SSL_VERIFY_PEER | SSL_VERIFY_POST_HANDSHAKE),
 408         SSL_FLAG_VFY_SRV("RequirePostHandshake",
 409                          SSL_VERIFY_PEER | SSL_VERIFY_POST_HANDSHAKE |
 410                          SSL_VERIFY_FAIL_IF_NO_PEER_CERT),
 411     };
 412     if (value == NULL)
 413         return -3;
 414     cctx->tbl = ssl_vfy_list;
 415     cctx->ntbl = OSSL_NELEM(ssl_vfy_list);
 416     return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
 417 }
 418
 419 static int cmd_Certificate(SSL_CONF_CTX *cctx, const char *value)
 420 {
 421     int rv = 1;
 422     CERT *c = NULL;
 423     if (cctx->ctx) {
 424         rv = SSL_CTX_use_certificate_chain_file(cctx->ctx, value);
 425         c = cctx->ctx->cert;
 426     }
 427     if (cctx->ssl) {
 428         rv = SSL_use_certificate_chain_file(cctx->ssl, value);
 429         c = cctx->ssl->cert;
 430     }
 431     if (rv > 0 && c && cctx->flags & SSL_CONF_FLAG_REQUIRE_PRIVATE) {
 432         char **pfilename = &cctx->cert_filename[c->key - c->pkeys];
 433         OPENSSL_free(*pfilename);
 434         *pfilename = OPENSSL_strdup(value);
 435         if (*pfilename == NULL)
 436             rv = 0;
 437     }
 438
 439     return rv > 0;
 440 }
 441
 442 static int cmd_PrivateKey(SSL_CONF_CTX *cctx, const char *value)
 443 {
 444     int rv = 1;
 445     if (!(cctx->flags & SSL_CONF_FLAG_CERTIFICATE))
 446         return -2;
 447     if (cctx->ctx)
 448         rv = SSL_CTX_use_PrivateKey_file(cctx->ctx, value, SSL_FILETYPE_PEM);
 449     if (cctx->ssl)
 450         rv = SSL_use_PrivateKey_file(cctx->ssl, value, SSL_FILETYPE_PEM);
 451     return rv > 0;
 452 }
 453
 454 static int cmd_ServerInfoFile(SSL_CONF_CTX *cctx, const char *value)
 455 {
 456     int rv = 1;
 457     if (cctx->ctx)
 458         rv = SSL_CTX_use_serverinfo_file(cctx->ctx, value);
 459     return rv > 0;
 460 }
 461
 462 static int do_store(SSL_CONF_CTX *cctx,
 463                     const char *CAfile, const char *CApath, const char *CAstore,
 464                     int verify_store)
 465 {
 466     CERT *cert;
 467     X509_STORE **st;
 468     SSL_CTX *ctx;
 469     OSSL_LIB_CTX *libctx = NULL;
 470     const char *propq = NULL;
 471
 472     if (cctx->ctx != NULL) {
 473         cert = cctx->ctx->cert;
 474         ctx = cctx->ctx;
 475     } else if (cctx->ssl != NULL) {
 476         cert = cctx->ssl->cert;
 477         ctx = cctx->ssl->ctx;
 478     } else {
 479         return 1;
 480     }
 481     if (ctx != NULL) {
 482         libctx = ctx->libctx;
 483         propq = ctx->propq;
 484     }
 485     st = verify_store ? &cert->verify_store : &cert->chain_store;
 486     if (*st == NULL) {
 487         *st = X509_STORE_new();
 488         if (*st == NULL)
 489             return 0;
 490     }
 491
 492     if (CAfile != NULL && !X509_STORE_load_file_ex(*st, CAfile, libctx, propq))
 493         return 0;
 494     if (CApath != NULL && !X509_STORE_load_path(*st, CApath))
 495         return 0;
 496     if (CAstore != NULL && !X509_STORE_load_store_ex(*st, CAstore, libctx,
 497                                                      propq))
 498         return 0;
 499     return 1;
 500 }
 501
 502 static int cmd_ChainCAPath(SSL_CONF_CTX *cctx, const char *value)
 503 {
 504     return do_store(cctx, NULL, value, NULL, 0);
 505 }
 506
 507 static int cmd_ChainCAFile(SSL_CONF_CTX *cctx, const char *value)
 508 {
 509     return do_store(cctx, value, NULL, NULL, 0);
 510 }
 511
 512 static int cmd_ChainCAStore(SSL_CONF_CTX *cctx, const char *value)
 513 {
 514     return do_store(cctx, NULL, NULL, value, 0);
 515 }
 516
 517 static int cmd_VerifyCAPath(SSL_CONF_CTX *cctx, const char *value)
 518 {
 519     return do_store(cctx, NULL, value, NULL, 1);
 520 }
 521
 522 static int cmd_VerifyCAFile(SSL_CONF_CTX *cctx, const char *value)
 523 {
 524     return do_store(cctx, value, NULL, NULL, 1);
 525 }
 526
 527 static int cmd_VerifyCAStore(SSL_CONF_CTX *cctx, const char *value)
 528 {
 529     return do_store(cctx, NULL, NULL, value, 1);
 530 }
 531
 532 static int cmd_RequestCAFile(SSL_CONF_CTX *cctx, const char *value)
 533 {
 534     if (cctx->canames == NULL)
 535         cctx->canames = sk_X509_NAME_new_null();
 536     if (cctx->canames == NULL)
 537         return 0;
 538     return SSL_add_file_cert_subjects_to_stack(cctx->canames, value);
 539 }
 540
 541 static int cmd_ClientCAFile(SSL_CONF_CTX *cctx, const char *value)
 542 {
 543     return cmd_RequestCAFile(cctx, value);
 544 }
 545
 546 static int cmd_RequestCAPath(SSL_CONF_CTX *cctx, const char *value)
 547 {
 548     if (cctx->canames == NULL)
 549         cctx->canames = sk_X509_NAME_new_null();
 550     if (cctx->canames == NULL)
 551         return 0;
 552     return SSL_add_dir_cert_subjects_to_stack(cctx->canames, value);
 553 }
 554
 555 static int cmd_ClientCAPath(SSL_CONF_CTX *cctx, const char *value)
 556 {
 557     return cmd_RequestCAPath(cctx, value);
 558 }
 559
 560 static int cmd_RequestCAStore(SSL_CONF_CTX *cctx, const char *value)
 561 {
 562     if (cctx->canames == NULL)
 563         cctx->canames = sk_X509_NAME_new_null();
 564     if (cctx->canames == NULL)
 565         return 0;
 566     return SSL_add_store_cert_subjects_to_stack(cctx->canames, value);
 567 }
 568
 569 static int cmd_ClientCAStore(SSL_CONF_CTX *cctx, const char *value)
 570 {
 571     return cmd_RequestCAStore(cctx, value);
 572 }
 573
 574 static int cmd_DHParameters(SSL_CONF_CTX *cctx, const char *value)
 575 {
 576     int rv = 0;
 577     EVP_PKEY *dhpkey = NULL;
 578     BIO *in = NULL;
 579     SSL_CTX *sslctx = (cctx->ssl != NULL) ? cctx->ssl->ctx : cctx->ctx;
 580     OSSL_DECODER_CTX *decoderctx = NULL;
 581
 582     if (cctx->ctx != NULL || cctx->ssl != NULL) {
 583         in = BIO_new(BIO_s_file());
 584         if (in == NULL)
 585             goto end;
 586         if (BIO_read_filename(in, value) <= 0)
 587             goto end;
 588
 589         decoderctx
 590             = OSSL_DECODER_CTX_new_for_pkey(&dhpkey, "PEM", NULL, "DH",
 591                                             OSSL_KEYMGMT_SELECT_DOMAIN_PARAMETERS,
 592                                             sslctx->libctx, sslctx->propq);
 593         if (decoderctx == NULL
 594                 || !OSSL_DECODER_from_bio(decoderctx, in)) {
 595             OSSL_DECODER_CTX_free(decoderctx);
 596             goto end;
 597         }
 598         OSSL_DECODER_CTX_free(decoderctx);
 599
 600         if (dhpkey == NULL)
 601             goto end;
 602     } else {
 603         return 1;
 604     }
 605
 606     if (cctx->ctx != NULL) {
 607         if ((rv = SSL_CTX_set0_tmp_dh_pkey(cctx->ctx, dhpkey)) > 0)
 608             dhpkey = NULL;
 609     }
 610     if (cctx->ssl != NULL) {
 611         if ((rv = SSL_set0_tmp_dh_pkey(cctx->ssl, dhpkey)) > 0)
 612             dhpkey = NULL;
 613     }
 614  end:
 615     EVP_PKEY_free(dhpkey);
 616     BIO_free(in);
 617     return rv > 0;
 618 }
 619
 620 static int cmd_RecordPadding(SSL_CONF_CTX *cctx, const char *value)
 621 {
 622     int rv = 0;
 623     int block_size = atoi(value);
 624
 625     /*
 626      * All we care about is a non-negative value,
 627      * the setters check the range
 628      */
 629     if (block_size >= 0) {
 630         if (cctx->ctx)
 631             rv = SSL_CTX_set_block_padding(cctx->ctx, block_size);
 632         if (cctx->ssl)
 633             rv = SSL_set_block_padding(cctx->ssl, block_size);
 634     }
 635     return rv;
 636 }
 637
 638
 639 static int cmd_NumTickets(SSL_CONF_CTX *cctx, const char *value)
 640 {
 641     int rv = 0;
 642     int num_tickets = atoi(value);
 643
 644     if (num_tickets >= 0) {
 645         if (cctx->ctx)
 646             rv = SSL_CTX_set_num_tickets(cctx->ctx, num_tickets);
 647         if (cctx->ssl)
 648             rv = SSL_set_num_tickets(cctx->ssl, num_tickets);
 649     }
 650     return rv;
 651 }
 652
 653 typedef struct {
 654     int (*cmd) (SSL_CONF_CTX *cctx, const char *value);
 655     const char *str_file;
 656     const char *str_cmdline;
 657     unsigned short flags;
 658     unsigned short value_type;
 659 } ssl_conf_cmd_tbl;
 660
 661 /* Table of supported parameters */
 662
 663 #define SSL_CONF_CMD(name, cmdopt, flags, type) \
 664         {cmd_##name, #name, cmdopt, flags, type}
 665
 666 #define SSL_CONF_CMD_STRING(name, cmdopt, flags) \
 667         SSL_CONF_CMD(name, cmdopt, flags, SSL_CONF_TYPE_STRING)
 668
 669 #define SSL_CONF_CMD_SWITCH(name, flags) \
 670         {0, NULL, name, flags, SSL_CONF_TYPE_NONE}
 671
 672 /* See apps/apps.h if you change this table. */
 673 static const ssl_conf_cmd_tbl ssl_conf_cmds[] = {
 674     SSL_CONF_CMD_SWITCH("no_ssl3", 0),
 675     SSL_CONF_CMD_SWITCH("no_tls1", 0),
 676     SSL_CONF_CMD_SWITCH("no_tls1_1", 0),
 677     SSL_CONF_CMD_SWITCH("no_tls1_2", 0),
 678     SSL_CONF_CMD_SWITCH("no_tls1_3", 0),
 679     SSL_CONF_CMD_SWITCH("bugs", 0),
 680     SSL_CONF_CMD_SWITCH("no_comp", 0),
 681     SSL_CONF_CMD_SWITCH("comp", 0),
 682     SSL_CONF_CMD_SWITCH("ecdh_single", SSL_CONF_FLAG_SERVER),
 683     SSL_CONF_CMD_SWITCH("no_ticket", 0),
 684     SSL_CONF_CMD_SWITCH("serverpref", SSL_CONF_FLAG_SERVER),
 685     SSL_CONF_CMD_SWITCH("legacy_renegotiation", 0),
 686     SSL_CONF_CMD_SWITCH("legacy_server_connect", SSL_CONF_FLAG_SERVER),
 687     SSL_CONF_CMD_SWITCH("no_renegotiation", 0),
 688     SSL_CONF_CMD_SWITCH("no_resumption_on_reneg", SSL_CONF_FLAG_SERVER),
 689     SSL_CONF_CMD_SWITCH("no_legacy_server_connect", SSL_CONF_FLAG_SERVER),
 690     SSL_CONF_CMD_SWITCH("allow_no_dhe_kex", 0),
 691     SSL_CONF_CMD_SWITCH("prioritize_chacha", SSL_CONF_FLAG_SERVER),
 692     SSL_CONF_CMD_SWITCH("strict", 0),
 693     SSL_CONF_CMD_SWITCH("no_middlebox", 0),
 694     SSL_CONF_CMD_SWITCH("anti_replay", SSL_CONF_FLAG_SERVER),
 695     SSL_CONF_CMD_SWITCH("no_anti_replay", SSL_CONF_FLAG_SERVER),
 696     SSL_CONF_CMD_STRING(SignatureAlgorithms, "sigalgs", 0),
 697     SSL_CONF_CMD_STRING(ClientSignatureAlgorithms, "client_sigalgs", 0),
 698     SSL_CONF_CMD_STRING(Curves, "curves", 0),
 699     SSL_CONF_CMD_STRING(Groups, "groups", 0),
 700     SSL_CONF_CMD_STRING(ECDHParameters, "named_curve", SSL_CONF_FLAG_SERVER),
 701     SSL_CONF_CMD_STRING(CipherString, "cipher", 0),
 702     SSL_CONF_CMD_STRING(Ciphersuites, "ciphersuites", 0),
 703     SSL_CONF_CMD_STRING(Protocol, NULL, 0),
 704     SSL_CONF_CMD_STRING(MinProtocol, "min_protocol", 0),
 705     SSL_CONF_CMD_STRING(MaxProtocol, "max_protocol", 0),
 706     SSL_CONF_CMD_STRING(Options, NULL, 0),
 707     SSL_CONF_CMD_STRING(VerifyMode, NULL, 0),
 708     SSL_CONF_CMD(Certificate, "cert", SSL_CONF_FLAG_CERTIFICATE,
 709                  SSL_CONF_TYPE_FILE),
 710     SSL_CONF_CMD(PrivateKey, "key", SSL_CONF_FLAG_CERTIFICATE,
 711                  SSL_CONF_TYPE_FILE),
 712     SSL_CONF_CMD(ServerInfoFile, NULL,
 713                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 714                  SSL_CONF_TYPE_FILE),
 715     SSL_CONF_CMD(ChainCAPath, "chainCApath", SSL_CONF_FLAG_CERTIFICATE,
 716                  SSL_CONF_TYPE_DIR),
 717     SSL_CONF_CMD(ChainCAFile, "chainCAfile", SSL_CONF_FLAG_CERTIFICATE,
 718                  SSL_CONF_TYPE_FILE),
 719     SSL_CONF_CMD(ChainCAStore, "chainCAstore", SSL_CONF_FLAG_CERTIFICATE,
 720                  SSL_CONF_TYPE_STORE),
 721     SSL_CONF_CMD(VerifyCAPath, "verifyCApath", SSL_CONF_FLAG_CERTIFICATE,
 722                  SSL_CONF_TYPE_DIR),
 723     SSL_CONF_CMD(VerifyCAFile, "verifyCAfile", SSL_CONF_FLAG_CERTIFICATE,
 724                  SSL_CONF_TYPE_FILE),
 725     SSL_CONF_CMD(VerifyCAStore, "verifyCAstore", SSL_CONF_FLAG_CERTIFICATE,
 726                  SSL_CONF_TYPE_STORE),
 727     SSL_CONF_CMD(RequestCAFile, "requestCAFile", SSL_CONF_FLAG_CERTIFICATE,
 728                  SSL_CONF_TYPE_FILE),
 729     SSL_CONF_CMD(ClientCAFile, NULL,
 730                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 731                  SSL_CONF_TYPE_FILE),
 732     SSL_CONF_CMD(RequestCAPath, NULL, SSL_CONF_FLAG_CERTIFICATE,
 733                  SSL_CONF_TYPE_DIR),
 734     SSL_CONF_CMD(ClientCAPath, NULL,
 735                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 736                  SSL_CONF_TYPE_DIR),
 737     SSL_CONF_CMD(RequestCAStore, "requestCAStore", SSL_CONF_FLAG_CERTIFICATE,
 738                  SSL_CONF_TYPE_STORE),
 739     SSL_CONF_CMD(ClientCAStore, NULL,
 740                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 741                  SSL_CONF_TYPE_STORE),
 742     SSL_CONF_CMD(DHParameters, "dhparam",
 743                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 744                  SSL_CONF_TYPE_FILE),
 745     SSL_CONF_CMD_STRING(RecordPadding, "record_padding", 0),
 746     SSL_CONF_CMD_STRING(NumTickets, "num_tickets", SSL_CONF_FLAG_SERVER),
 747 };
 748
 749 /* Supported switches: must match order of switches in ssl_conf_cmds */
 750 static const ssl_switch_tbl ssl_cmd_switches[] = {
 751     {SSL_OP_NO_SSLv3, 0},       /* no_ssl3 */
 752     {SSL_OP_NO_TLSv1, 0},       /* no_tls1 */
 753     {SSL_OP_NO_TLSv1_1, 0},     /* no_tls1_1 */
 754     {SSL_OP_NO_TLSv1_2, 0},     /* no_tls1_2 */
 755     {SSL_OP_NO_TLSv1_3, 0},     /* no_tls1_3 */
 756     {SSL_OP_ALL, 0},            /* bugs */
 757     {SSL_OP_NO_COMPRESSION, 0}, /* no_comp */
 758     {SSL_OP_NO_COMPRESSION, SSL_TFLAG_INV}, /* comp */
 759     {SSL_OP_SINGLE_ECDH_USE, 0}, /* ecdh_single */
 760     {SSL_OP_NO_TICKET, 0},      /* no_ticket */
 761     {SSL_OP_CIPHER_SERVER_PREFERENCE, 0}, /* serverpref */
 762     /* legacy_renegotiation */
 763     {SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION, 0},
 764     /* legacy_server_connect */
 765     {SSL_OP_LEGACY_SERVER_CONNECT, 0},
 766     /* no_renegotiation */
 767     {SSL_OP_NO_RENEGOTIATION, 0},
 768     /* no_resumption_on_reneg */
 769     {SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION, 0},
 770     /* no_legacy_server_connect */
 771     {SSL_OP_LEGACY_SERVER_CONNECT, SSL_TFLAG_INV},
 772     /* allow_no_dhe_kex */
 773     {SSL_OP_ALLOW_NO_DHE_KEX, 0},
 774     /* chacha reprioritization */
 775     {SSL_OP_PRIORITIZE_CHACHA, 0},
 776     {SSL_CERT_FLAG_TLS_STRICT, SSL_TFLAG_CERT}, /* strict */
 777     /* no_middlebox */
 778     {SSL_OP_ENABLE_MIDDLEBOX_COMPAT, SSL_TFLAG_INV},
 779     /* anti_replay */
 780     {SSL_OP_NO_ANTI_REPLAY, SSL_TFLAG_INV},
 781     /* no_anti_replay */
 782     {SSL_OP_NO_ANTI_REPLAY, 0},
 783 };
 784
 785 static int ssl_conf_cmd_skip_prefix(SSL_CONF_CTX *cctx, const char **pcmd)
 786 {
 787     if (pcmd == NULL || *pcmd == NULL)
 788         return 0;
 789     /* If a prefix is set, check and skip */
 790     if (cctx->prefix) {
 791         if (strlen(*pcmd) <= cctx->prefixlen)
 792             return 0;
 793         if (cctx->flags & SSL_CONF_FLAG_CMDLINE &&
 794             strncmp(*pcmd, cctx->prefix, cctx->prefixlen))
 795             return 0;
 796         if (cctx->flags & SSL_CONF_FLAG_FILE &&
 797             strncasecmp(*pcmd, cctx->prefix, cctx->prefixlen))
 798             return 0;
 799         *pcmd += cctx->prefixlen;
 800     } else if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
 801         if (**pcmd != '-' || !(*pcmd)[1])
 802             return 0;
 803         *pcmd += 1;
 804     }
 805     return 1;
 806 }
 807
 808 /* Determine if a command is allowed according to cctx flags */
 809 static int ssl_conf_cmd_allowed(SSL_CONF_CTX *cctx, const ssl_conf_cmd_tbl * t)
 810 {
 811     unsigned int tfl = t->flags;
 812     unsigned int cfl = cctx->flags;
 813     if ((tfl & SSL_CONF_FLAG_SERVER) && !(cfl & SSL_CONF_FLAG_SERVER))
 814         return 0;
 815     if ((tfl & SSL_CONF_FLAG_CLIENT) && !(cfl & SSL_CONF_FLAG_CLIENT))
 816         return 0;
 817     if ((tfl & SSL_CONF_FLAG_CERTIFICATE)
 818         && !(cfl & SSL_CONF_FLAG_CERTIFICATE))
 819         return 0;
 820     return 1;
 821 }
 822
 823 static const ssl_conf_cmd_tbl *ssl_conf_cmd_lookup(SSL_CONF_CTX *cctx,
 824                                                    const char *cmd)
 825 {
 826     const ssl_conf_cmd_tbl *t;
 827     size_t i;
 828     if (cmd == NULL)
 829         return NULL;
 830
 831     /* Look for matching parameter name in table */
 832     for (i = 0, t = ssl_conf_cmds; i < OSSL_NELEM(ssl_conf_cmds); i++, t++) {
 833         if (ssl_conf_cmd_allowed(cctx, t)) {
 834             if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
 835                 if (t->str_cmdline && strcmp(t->str_cmdline, cmd) == 0)
 836                     return t;
 837             }
 838             if (cctx->flags & SSL_CONF_FLAG_FILE) {
 839                 if (t->str_file && strcasecmp(t->str_file, cmd) == 0)
 840                     return t;
 841             }
 842         }
 843     }
 844     return NULL;
 845 }
 846
 847 static int ctrl_switch_option(SSL_CONF_CTX *cctx, const ssl_conf_cmd_tbl * cmd)
 848 {
 849     /* Find index of command in table */
 850     size_t idx = cmd - ssl_conf_cmds;
 851     const ssl_switch_tbl *scmd;
 852     /* Sanity check index */
 853     if (idx >= OSSL_NELEM(ssl_cmd_switches))
 854         return 0;
 855     /* Obtain switches entry with same index */
 856     scmd = ssl_cmd_switches + idx;
 857     ssl_set_option(cctx, scmd->name_flags, scmd->option_value, 1);
 858     return 1;
 859 }
 860
 861 int SSL_CONF_cmd(SSL_CONF_CTX *cctx, const char *cmd, const char *value)
 862 {
 863     const ssl_conf_cmd_tbl *runcmd;
 864     if (cmd == NULL) {
 865         ERR_raise(ERR_LIB_SSL, SSL_R_INVALID_NULL_CMD_NAME);
 866         return 0;
 867     }
 868
 869     if (!ssl_conf_cmd_skip_prefix(cctx, &cmd))
 870         return -2;
 871
 872     runcmd = ssl_conf_cmd_lookup(cctx, cmd);
 873
 874     if (runcmd) {
 875         int rv;
 876         if (runcmd->value_type == SSL_CONF_TYPE_NONE) {
 877             return ctrl_switch_option(cctx, runcmd);
 878         }
 879         if (value == NULL)
 880             return -3;
 881         rv = runcmd->cmd(cctx, value);
 882         if (rv > 0)
 883             return 2;
 884         if (rv == -2)
 885             return -2;
 886         if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS)
 887             ERR_raise_data(ERR_LIB_SSL, SSL_R_BAD_VALUE,
 888                            "cmd=%s, value=%s", cmd, value);
 889         return 0;
 890     }
 891
 892     if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS)
 893         ERR_raise_data(ERR_LIB_SSL, SSL_R_UNKNOWN_CMD_NAME, "cmd=%s", cmd);
 894
 895     return -2;
 896 }
 897
 898 int SSL_CONF_cmd_argv(SSL_CONF_CTX *cctx, int *pargc, char ***pargv)
 899 {
 900     int rv;
 901     const char *arg = NULL, *argn;
 902
 903     if (pargc != NULL && *pargc == 0)
 904         return 0;
 905     if (pargc == NULL || *pargc > 0)
 906         arg = **pargv;
 907     if (arg == NULL)
 908         return 0;
 909     if (pargc == NULL || *pargc > 1)
 910         argn = (*pargv)[1];
 911     else
 912         argn = NULL;
 913     cctx->flags &= ~SSL_CONF_FLAG_FILE;
 914     cctx->flags |= SSL_CONF_FLAG_CMDLINE;
 915     rv = SSL_CONF_cmd(cctx, arg, argn);
 916     if (rv > 0) {
 917         /* Success: update pargc, pargv */
 918         (*pargv) += rv;
 919         if (pargc)
 920             (*pargc) -= rv;
 921         return rv;
 922     }
 923     /* Unknown switch: indicate no arguments processed */
 924     if (rv == -2)
 925         return 0;
 926     /* Some error occurred processing command, return fatal error */
 927     if (rv == 0)
 928         return -1;
 929     return rv;
 930 }
 931
 932 int SSL_CONF_cmd_value_type(SSL_CONF_CTX *cctx, const char *cmd)
 933 {
 934     if (ssl_conf_cmd_skip_prefix(cctx, &cmd)) {
 935         const ssl_conf_cmd_tbl *runcmd;
 936         runcmd = ssl_conf_cmd_lookup(cctx, cmd);
 937         if (runcmd)
 938             return runcmd->value_type;
 939     }
 940     return SSL_CONF_TYPE_UNKNOWN;
 941 }
 942
 943 SSL_CONF_CTX *SSL_CONF_CTX_new(void)
 944 {
 945     SSL_CONF_CTX *ret = OPENSSL_zalloc(sizeof(*ret));
 946
 947     return ret;
 948 }
 949
 950 int SSL_CONF_CTX_finish(SSL_CONF_CTX *cctx)
 951 {
 952     /* See if any certificates are missing private keys */
 953     size_t i;
 954     CERT *c = NULL;
 955     if (cctx->ctx)
 956         c = cctx->ctx->cert;
 957     else if (cctx->ssl)
 958         c = cctx->ssl->cert;
 959     if (c && cctx->flags & SSL_CONF_FLAG_REQUIRE_PRIVATE) {
 960         for (i = 0; i < SSL_PKEY_NUM; i++) {
 961             const char *p = cctx->cert_filename[i];
 962             /*
 963              * If missing private key try to load one from certificate file
 964              */
 965             if (p && !c->pkeys[i].privatekey) {
 966                 if (!cmd_PrivateKey(cctx, p))
 967                     return 0;
 968             }
 969         }
 970     }
 971     if (cctx->canames) {
 972         if (cctx->ssl)
 973             SSL_set0_CA_list(cctx->ssl, cctx->canames);
 974         else if (cctx->ctx)
 975             SSL_CTX_set0_CA_list(cctx->ctx, cctx->canames);
 976         else
 977             sk_X509_NAME_pop_free(cctx->canames, X509_NAME_free);
 978         cctx->canames = NULL;
 979     }
 980     return 1;
 981 }
 982
 983 void SSL_CONF_CTX_free(SSL_CONF_CTX *cctx)
 984 {
 985     if (cctx) {
 986         size_t i;
 987         for (i = 0; i < SSL_PKEY_NUM; i++)
 988             OPENSSL_free(cctx->cert_filename[i]);
 989         OPENSSL_free(cctx->prefix);
 990         sk_X509_NAME_pop_free(cctx->canames, X509_NAME_free);
 991         OPENSSL_free(cctx);
 992     }
 993 }
 994
 995 unsigned int SSL_CONF_CTX_set_flags(SSL_CONF_CTX *cctx, unsigned int flags)
 996 {
 997     cctx->flags |= flags;
 998     return cctx->flags;
 999 }
1000
1001 unsigned int SSL_CONF_CTX_clear_flags(SSL_CONF_CTX *cctx, unsigned int flags)
1002 {
1003     cctx->flags &= ~flags;
1004     return cctx->flags;
1005 }
1006
1007 int SSL_CONF_CTX_set1_prefix(SSL_CONF_CTX *cctx, const char *pre)
1008 {
1009     char *tmp = NULL;
1010     if (pre) {
1011         tmp = OPENSSL_strdup(pre);
1012         if (tmp == NULL)
1013             return 0;
1014     }
1015     OPENSSL_free(cctx->prefix);
1016     cctx->prefix = tmp;
1017     if (tmp)
1018         cctx->prefixlen = strlen(tmp);
1019     else
1020         cctx->prefixlen = 0;
1021     return 1;
1022 }
1023
1024 void SSL_CONF_CTX_set_ssl(SSL_CONF_CTX *cctx, SSL *ssl)
1025 {
1026     cctx->ssl = ssl;
1027     cctx->ctx = NULL;
1028     if (ssl) {
1029         cctx->poptions = &ssl->options;
1030         cctx->min_version = &ssl->min_proto_version;
1031         cctx->max_version = &ssl->max_proto_version;
1032         cctx->pcert_flags = &ssl->cert->cert_flags;
1033         cctx->pvfy_flags = &ssl->verify_mode;
1034     } else {
1035         cctx->poptions = NULL;
1036         cctx->min_version = NULL;
1037         cctx->max_version = NULL;
1038         cctx->pcert_flags = NULL;
1039         cctx->pvfy_flags = NULL;
1040     }
1041 }
1042
1043 void SSL_CONF_CTX_set_ssl_ctx(SSL_CONF_CTX *cctx, SSL_CTX *ctx)
1044 {
1045     cctx->ctx = ctx;
1046     cctx->ssl = NULL;
1047     if (ctx) {
1048         cctx->poptions = &ctx->options;
1049         cctx->min_version = &ctx->min_proto_version;
1050         cctx->max_version = &ctx->max_proto_version;
1051         cctx->pcert_flags = &ctx->cert->cert_flags;
1052         cctx->pvfy_flags = &ctx->verify_mode;
1053     } else {
1054         cctx->poptions = NULL;
1055         cctx->min_version = NULL;
1056         cctx->max_version = NULL;
1057         cctx->pcert_flags = NULL;
1058         cctx->pvfy_flags = NULL;
1059     }
1060 }