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     /*
 307      * Note: To avoid breaking previously valid configurations, we must retain
 308      * legacy entries in this table even if the underlying protocol is no
 309      * longer supported.  This also means that the constants SSL3_VERSION, ...
 310      * need to be retained indefinitely.  This table can only grow, never
 311      * shrink.
 312      */
 313     static const struct protocol_versions versions[] = {
 314         {"None", 0},
 315         {"SSLv3", SSL3_VERSION},
 316         {"TLSv1", TLS1_VERSION},
 317         {"TLSv1.1", TLS1_1_VERSION},
 318         {"TLSv1.2", TLS1_2_VERSION},
 319         {"TLSv1.3", TLS1_3_VERSION},
 320         {"DTLSv1", DTLS1_VERSION},
 321         {"DTLSv1.2", DTLS1_2_VERSION}
 322     };
 323     size_t i;
 324     size_t n = OSSL_NELEM(versions);
 325
 326     for (i = 0; i < n; i++)
 327         if (strcmp(versions[i].name, value) == 0)
 328             return versions[i].version;
 329     return -1;
 330 }
 331
 332 static int min_max_proto(SSL_CONF_CTX *cctx, const char *value, int *bound)
 333 {
 334     int method_version;
 335     int new_version;
 336
 337     if (cctx->ctx != NULL)
 338         method_version = cctx->ctx->method->version;
 339     else if (cctx->ssl != NULL)
 340         method_version = cctx->ssl->ctx->method->version;
 341     else
 342         return 0;
 343     if ((new_version = protocol_from_string(value)) < 0)
 344         return 0;
 345     return ssl_set_version_bound(method_version, new_version, bound);
 346 }
 347
 348 /*
 349  * cmd_MinProtocol - Set min protocol version
 350  * @cctx: config structure to save settings in
 351  * @value: The min protocol version in string form
 352  *
 353  * Returns 1 on success and 0 on failure.
 354  */
 355 static int cmd_MinProtocol(SSL_CONF_CTX *cctx, const char *value)
 356 {
 357     return min_max_proto(cctx, value, cctx->min_version);
 358 }
 359
 360 /*
 361  * cmd_MaxProtocol - Set max protocol version
 362  * @cctx: config structure to save settings in
 363  * @value: The max protocol version in string form
 364  *
 365  * Returns 1 on success and 0 on failure.
 366  */
 367 static int cmd_MaxProtocol(SSL_CONF_CTX *cctx, const char *value)
 368 {
 369     return min_max_proto(cctx, value, cctx->max_version);
 370 }
 371
 372 static int cmd_Options(SSL_CONF_CTX *cctx, const char *value)
 373 {
 374     static const ssl_flag_tbl ssl_option_list[] = {
 375         SSL_FLAG_TBL_INV("SessionTicket", SSL_OP_NO_TICKET),
 376         SSL_FLAG_TBL_INV("EmptyFragments",
 377                          SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS),
 378         SSL_FLAG_TBL("Bugs", SSL_OP_ALL),
 379         SSL_FLAG_TBL_INV("Compression", SSL_OP_NO_COMPRESSION),
 380         SSL_FLAG_TBL_SRV("ServerPreference", SSL_OP_CIPHER_SERVER_PREFERENCE),
 381         SSL_FLAG_TBL_SRV("NoResumptionOnRenegotiation",
 382                          SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION),
 383         SSL_FLAG_TBL_SRV("DHSingle", SSL_OP_SINGLE_DH_USE),
 384         SSL_FLAG_TBL_SRV("ECDHSingle", SSL_OP_SINGLE_ECDH_USE),
 385         SSL_FLAG_TBL("UnsafeLegacyRenegotiation",
 386                      SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION),
 387         SSL_FLAG_TBL_INV("EncryptThenMac", SSL_OP_NO_ENCRYPT_THEN_MAC),
 388         SSL_FLAG_TBL("NoRenegotiation", SSL_OP_NO_RENEGOTIATION),
 389         SSL_FLAG_TBL("AllowNoDHEKEX", SSL_OP_ALLOW_NO_DHE_KEX),
 390         SSL_FLAG_TBL("PrioritizeChaCha", SSL_OP_PRIORITIZE_CHACHA),
 391         SSL_FLAG_TBL("MiddleboxCompat", SSL_OP_ENABLE_MIDDLEBOX_COMPAT),
 392         SSL_FLAG_TBL_INV("AntiReplay", SSL_OP_NO_ANTI_REPLAY),
 393         SSL_FLAG_TBL_INV("ExtendedMasterSecret", SSL_OP_NO_EXTENDED_MASTER_SECRET),
 394         SSL_FLAG_TBL_INV("CANames", SSL_OP_DISABLE_TLSEXT_CA_NAMES)
 395     };
 396     if (value == NULL)
 397         return -3;
 398     cctx->tbl = ssl_option_list;
 399     cctx->ntbl = OSSL_NELEM(ssl_option_list);
 400     return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
 401 }
 402
 403 static int cmd_VerifyMode(SSL_CONF_CTX *cctx, const char *value)
 404 {
 405     static const ssl_flag_tbl ssl_vfy_list[] = {
 406         SSL_FLAG_VFY_CLI("Peer", SSL_VERIFY_PEER),
 407         SSL_FLAG_VFY_SRV("Request", SSL_VERIFY_PEER),
 408         SSL_FLAG_VFY_SRV("Require",
 409                          SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT),
 410         SSL_FLAG_VFY_SRV("Once", SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE),
 411         SSL_FLAG_VFY_SRV("RequestPostHandshake",
 412                          SSL_VERIFY_PEER | SSL_VERIFY_POST_HANDSHAKE),
 413         SSL_FLAG_VFY_SRV("RequirePostHandshake",
 414                          SSL_VERIFY_PEER | SSL_VERIFY_POST_HANDSHAKE |
 415                          SSL_VERIFY_FAIL_IF_NO_PEER_CERT),
 416     };
 417     if (value == NULL)
 418         return -3;
 419     cctx->tbl = ssl_vfy_list;
 420     cctx->ntbl = OSSL_NELEM(ssl_vfy_list);
 421     return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
 422 }
 423
 424 static int cmd_Certificate(SSL_CONF_CTX *cctx, const char *value)
 425 {
 426     int rv = 1;
 427     CERT *c = NULL;
 428     if (cctx->ctx) {
 429         rv = SSL_CTX_use_certificate_chain_file(cctx->ctx, value);
 430         c = cctx->ctx->cert;
 431     }
 432     if (cctx->ssl) {
 433         rv = SSL_use_certificate_chain_file(cctx->ssl, value);
 434         c = cctx->ssl->cert;
 435     }
 436     if (rv > 0 && c && cctx->flags & SSL_CONF_FLAG_REQUIRE_PRIVATE) {
 437         char **pfilename = &cctx->cert_filename[c->key - c->pkeys];
 438         OPENSSL_free(*pfilename);
 439         *pfilename = OPENSSL_strdup(value);
 440         if (*pfilename == NULL)
 441             rv = 0;
 442     }
 443
 444     return rv > 0;
 445 }
 446
 447 static int cmd_PrivateKey(SSL_CONF_CTX *cctx, const char *value)
 448 {
 449     int rv = 1;
 450     if (!(cctx->flags & SSL_CONF_FLAG_CERTIFICATE))
 451         return -2;
 452     if (cctx->ctx)
 453         rv = SSL_CTX_use_PrivateKey_file(cctx->ctx, value, SSL_FILETYPE_PEM);
 454     if (cctx->ssl)
 455         rv = SSL_use_PrivateKey_file(cctx->ssl, value, SSL_FILETYPE_PEM);
 456     return rv > 0;
 457 }
 458
 459 static int cmd_ServerInfoFile(SSL_CONF_CTX *cctx, const char *value)
 460 {
 461     int rv = 1;
 462     if (cctx->ctx)
 463         rv = SSL_CTX_use_serverinfo_file(cctx->ctx, value);
 464     return rv > 0;
 465 }
 466
 467 static int do_store(SSL_CONF_CTX *cctx,
 468                     const char *CAfile, const char *CApath, const char *CAstore,
 469                     int verify_store)
 470 {
 471     CERT *cert;
 472     X509_STORE **st;
 473     SSL_CTX *ctx;
 474     OPENSSL_CTX *libctx = NULL;
 475     const char *propq = NULL;
 476
 477     if (cctx->ctx != NULL) {
 478         cert = cctx->ctx->cert;
 479         ctx = cctx->ctx;
 480     } else if (cctx->ssl != NULL) {
 481         cert = cctx->ssl->cert;
 482         ctx = cctx->ssl->ctx;
 483     } else {
 484         return 1;
 485     }
 486     if (ctx != NULL) {
 487         libctx = ctx->libctx;
 488         propq = ctx->propq;
 489     }
 490     st = verify_store ? &cert->verify_store : &cert->chain_store;
 491     if (*st == NULL) {
 492         *st = X509_STORE_new();
 493         if (*st == NULL)
 494             return 0;
 495     }
 496
 497     if (CAfile != NULL && !X509_STORE_load_file_with_libctx(*st, CAfile,
 498                                                             libctx, propq))
 499         return 0;
 500     if (CApath != NULL && !X509_STORE_load_path(*st, CApath))
 501         return 0;
 502     if (CAstore != NULL && !X509_STORE_load_store_with_libctx(*st, CAstore,
 503                                                               libctx, propq))
 504         return 0;
 505     return 1;
 506 }
 507
 508 static int cmd_ChainCAPath(SSL_CONF_CTX *cctx, const char *value)
 509 {
 510     return do_store(cctx, NULL, value, NULL, 0);
 511 }
 512
 513 static int cmd_ChainCAFile(SSL_CONF_CTX *cctx, const char *value)
 514 {
 515     return do_store(cctx, value, NULL, NULL, 0);
 516 }
 517
 518 static int cmd_ChainCAStore(SSL_CONF_CTX *cctx, const char *value)
 519 {
 520     return do_store(cctx, NULL, NULL, value, 0);
 521 }
 522
 523 static int cmd_VerifyCAPath(SSL_CONF_CTX *cctx, const char *value)
 524 {
 525     return do_store(cctx, NULL, value, NULL, 1);
 526 }
 527
 528 static int cmd_VerifyCAFile(SSL_CONF_CTX *cctx, const char *value)
 529 {
 530     return do_store(cctx, value, NULL, NULL, 1);
 531 }
 532
 533 static int cmd_VerifyCAStore(SSL_CONF_CTX *cctx, const char *value)
 534 {
 535     return do_store(cctx, NULL, NULL, value, 1);
 536 }
 537
 538 static int cmd_RequestCAFile(SSL_CONF_CTX *cctx, const char *value)
 539 {
 540     if (cctx->canames == NULL)
 541         cctx->canames = sk_X509_NAME_new_null();
 542     if (cctx->canames == NULL)
 543         return 0;
 544     return SSL_add_file_cert_subjects_to_stack(cctx->canames, value);
 545 }
 546
 547 static int cmd_ClientCAFile(SSL_CONF_CTX *cctx, const char *value)
 548 {
 549     return cmd_RequestCAFile(cctx, value);
 550 }
 551
 552 static int cmd_RequestCAPath(SSL_CONF_CTX *cctx, const char *value)
 553 {
 554     if (cctx->canames == NULL)
 555         cctx->canames = sk_X509_NAME_new_null();
 556     if (cctx->canames == NULL)
 557         return 0;
 558     return SSL_add_dir_cert_subjects_to_stack(cctx->canames, value);
 559 }
 560
 561 static int cmd_ClientCAPath(SSL_CONF_CTX *cctx, const char *value)
 562 {
 563     return cmd_RequestCAPath(cctx, value);
 564 }
 565
 566 static int cmd_RequestCAStore(SSL_CONF_CTX *cctx, const char *value)
 567 {
 568     if (cctx->canames == NULL)
 569         cctx->canames = sk_X509_NAME_new_null();
 570     if (cctx->canames == NULL)
 571         return 0;
 572     return SSL_add_store_cert_subjects_to_stack(cctx->canames, value);
 573 }
 574
 575 static int cmd_ClientCAStore(SSL_CONF_CTX *cctx, const char *value)
 576 {
 577     return cmd_RequestCAStore(cctx, value);
 578 }
 579
 580 #ifndef OPENSSL_NO_DH
 581 static int cmd_DHParameters(SSL_CONF_CTX *cctx, const char *value)
 582 {
 583     int rv = 0;
 584     DH *dh = NULL;
 585     BIO *in = NULL;
 586     if (cctx->ctx || cctx->ssl) {
 587         in = BIO_new(BIO_s_file());
 588         if (in == NULL)
 589             goto end;
 590         if (BIO_read_filename(in, value) <= 0)
 591             goto end;
 592         dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL);
 593         if (dh == NULL)
 594             goto end;
 595     } else
 596         return 1;
 597     if (cctx->ctx)
 598         rv = SSL_CTX_set_tmp_dh(cctx->ctx, dh);
 599     if (cctx->ssl)
 600         rv = SSL_set_tmp_dh(cctx->ssl, dh);
 601  end:
 602     DH_free(dh);
 603     BIO_free(in);
 604     return rv > 0;
 605 }
 606 #endif
 607
 608 static int cmd_RecordPadding(SSL_CONF_CTX *cctx, const char *value)
 609 {
 610     int rv = 0;
 611     int block_size = atoi(value);
 612
 613     /*
 614      * All we care about is a non-negative value,
 615      * the setters check the range
 616      */
 617     if (block_size >= 0) {
 618         if (cctx->ctx)
 619             rv = SSL_CTX_set_block_padding(cctx->ctx, block_size);
 620         if (cctx->ssl)
 621             rv = SSL_set_block_padding(cctx->ssl, block_size);
 622     }
 623     return rv;
 624 }
 625
 626
 627 static int cmd_NumTickets(SSL_CONF_CTX *cctx, const char *value)
 628 {
 629     int rv = 0;
 630     int num_tickets = atoi(value);
 631
 632     if (num_tickets >= 0) {
 633         if (cctx->ctx)
 634             rv = SSL_CTX_set_num_tickets(cctx->ctx, num_tickets);
 635         if (cctx->ssl)
 636             rv = SSL_set_num_tickets(cctx->ssl, num_tickets);
 637     }
 638     return rv;
 639 }
 640
 641 typedef struct {
 642     int (*cmd) (SSL_CONF_CTX *cctx, const char *value);
 643     const char *str_file;
 644     const char *str_cmdline;
 645     unsigned short flags;
 646     unsigned short value_type;
 647 } ssl_conf_cmd_tbl;
 648
 649 /* Table of supported parameters */
 650
 651 #define SSL_CONF_CMD(name, cmdopt, flags, type) \
 652         {cmd_##name, #name, cmdopt, flags, type}
 653
 654 #define SSL_CONF_CMD_STRING(name, cmdopt, flags) \
 655         SSL_CONF_CMD(name, cmdopt, flags, SSL_CONF_TYPE_STRING)
 656
 657 #define SSL_CONF_CMD_SWITCH(name, flags) \
 658         {0, NULL, name, flags, SSL_CONF_TYPE_NONE}
 659
 660 /* See apps/apps.h if you change this table. */
 661 static const ssl_conf_cmd_tbl ssl_conf_cmds[] = {
 662     SSL_CONF_CMD_SWITCH("no_ssl3", 0),
 663     SSL_CONF_CMD_SWITCH("no_tls1", 0),
 664     SSL_CONF_CMD_SWITCH("no_tls1_1", 0),
 665     SSL_CONF_CMD_SWITCH("no_tls1_2", 0),
 666     SSL_CONF_CMD_SWITCH("no_tls1_3", 0),
 667     SSL_CONF_CMD_SWITCH("bugs", 0),
 668     SSL_CONF_CMD_SWITCH("no_comp", 0),
 669     SSL_CONF_CMD_SWITCH("comp", 0),
 670     SSL_CONF_CMD_SWITCH("ecdh_single", SSL_CONF_FLAG_SERVER),
 671     SSL_CONF_CMD_SWITCH("no_ticket", 0),
 672     SSL_CONF_CMD_SWITCH("serverpref", SSL_CONF_FLAG_SERVER),
 673     SSL_CONF_CMD_SWITCH("legacy_renegotiation", 0),
 674     SSL_CONF_CMD_SWITCH("legacy_server_connect", SSL_CONF_FLAG_SERVER),
 675     SSL_CONF_CMD_SWITCH("no_renegotiation", 0),
 676     SSL_CONF_CMD_SWITCH("no_resumption_on_reneg", SSL_CONF_FLAG_SERVER),
 677     SSL_CONF_CMD_SWITCH("no_legacy_server_connect", SSL_CONF_FLAG_SERVER),
 678     SSL_CONF_CMD_SWITCH("allow_no_dhe_kex", 0),
 679     SSL_CONF_CMD_SWITCH("prioritize_chacha", SSL_CONF_FLAG_SERVER),
 680     SSL_CONF_CMD_SWITCH("strict", 0),
 681     SSL_CONF_CMD_SWITCH("no_middlebox", 0),
 682     SSL_CONF_CMD_SWITCH("anti_replay", SSL_CONF_FLAG_SERVER),
 683     SSL_CONF_CMD_SWITCH("no_anti_replay", SSL_CONF_FLAG_SERVER),
 684     SSL_CONF_CMD_STRING(SignatureAlgorithms, "sigalgs", 0),
 685     SSL_CONF_CMD_STRING(ClientSignatureAlgorithms, "client_sigalgs", 0),
 686     SSL_CONF_CMD_STRING(Curves, "curves", 0),
 687     SSL_CONF_CMD_STRING(Groups, "groups", 0),
 688 #ifndef OPENSSL_NO_EC
 689     SSL_CONF_CMD_STRING(ECDHParameters, "named_curve", SSL_CONF_FLAG_SERVER),
 690 #endif
 691     SSL_CONF_CMD_STRING(CipherString, "cipher", 0),
 692     SSL_CONF_CMD_STRING(Ciphersuites, "ciphersuites", 0),
 693     SSL_CONF_CMD_STRING(Protocol, NULL, 0),
 694     SSL_CONF_CMD_STRING(MinProtocol, "min_protocol", 0),
 695     SSL_CONF_CMD_STRING(MaxProtocol, "max_protocol", 0),
 696     SSL_CONF_CMD_STRING(Options, NULL, 0),
 697     SSL_CONF_CMD_STRING(VerifyMode, NULL, 0),
 698     SSL_CONF_CMD(Certificate, "cert", SSL_CONF_FLAG_CERTIFICATE,
 699                  SSL_CONF_TYPE_FILE),
 700     SSL_CONF_CMD(PrivateKey, "key", SSL_CONF_FLAG_CERTIFICATE,
 701                  SSL_CONF_TYPE_FILE),
 702     SSL_CONF_CMD(ServerInfoFile, NULL,
 703                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 704                  SSL_CONF_TYPE_FILE),
 705     SSL_CONF_CMD(ChainCAPath, "chainCApath", SSL_CONF_FLAG_CERTIFICATE,
 706                  SSL_CONF_TYPE_DIR),
 707     SSL_CONF_CMD(ChainCAFile, "chainCAfile", SSL_CONF_FLAG_CERTIFICATE,
 708                  SSL_CONF_TYPE_FILE),
 709     SSL_CONF_CMD(ChainCAStore, "chainCAstore", SSL_CONF_FLAG_CERTIFICATE,
 710                  SSL_CONF_TYPE_STORE),
 711     SSL_CONF_CMD(VerifyCAPath, "verifyCApath", SSL_CONF_FLAG_CERTIFICATE,
 712                  SSL_CONF_TYPE_DIR),
 713     SSL_CONF_CMD(VerifyCAFile, "verifyCAfile", SSL_CONF_FLAG_CERTIFICATE,
 714                  SSL_CONF_TYPE_FILE),
 715     SSL_CONF_CMD(VerifyCAStore, "verifyCAstore", SSL_CONF_FLAG_CERTIFICATE,
 716                  SSL_CONF_TYPE_STORE),
 717     SSL_CONF_CMD(RequestCAFile, "requestCAFile", SSL_CONF_FLAG_CERTIFICATE,
 718                  SSL_CONF_TYPE_FILE),
 719     SSL_CONF_CMD(ClientCAFile, NULL,
 720                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 721                  SSL_CONF_TYPE_FILE),
 722     SSL_CONF_CMD(RequestCAPath, NULL, SSL_CONF_FLAG_CERTIFICATE,
 723                  SSL_CONF_TYPE_DIR),
 724     SSL_CONF_CMD(ClientCAPath, NULL,
 725                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 726                  SSL_CONF_TYPE_DIR),
 727     SSL_CONF_CMD(RequestCAStore, "requestCAStore", SSL_CONF_FLAG_CERTIFICATE,
 728                  SSL_CONF_TYPE_STORE),
 729     SSL_CONF_CMD(ClientCAStore, NULL,
 730                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 731                  SSL_CONF_TYPE_STORE),
 732 #ifndef OPENSSL_NO_DH
 733     SSL_CONF_CMD(DHParameters, "dhparam",
 734                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 735                  SSL_CONF_TYPE_FILE),
 736 #endif
 737     SSL_CONF_CMD_STRING(RecordPadding, "record_padding", 0),
 738     SSL_CONF_CMD_STRING(NumTickets, "num_tickets", SSL_CONF_FLAG_SERVER),
 739 };
 740
 741 /* Supported switches: must match order of switches in ssl_conf_cmds */
 742 static const ssl_switch_tbl ssl_cmd_switches[] = {
 743     {SSL_OP_NO_SSLv3, 0},       /* no_ssl3 */
 744     {SSL_OP_NO_TLSv1, 0},       /* no_tls1 */
 745     {SSL_OP_NO_TLSv1_1, 0},     /* no_tls1_1 */
 746     {SSL_OP_NO_TLSv1_2, 0},     /* no_tls1_2 */
 747     {SSL_OP_NO_TLSv1_3, 0},     /* no_tls1_3 */
 748     {SSL_OP_ALL, 0},            /* bugs */
 749     {SSL_OP_NO_COMPRESSION, 0}, /* no_comp */
 750     {SSL_OP_NO_COMPRESSION, SSL_TFLAG_INV}, /* comp */
 751     {SSL_OP_SINGLE_ECDH_USE, 0}, /* ecdh_single */
 752     {SSL_OP_NO_TICKET, 0},      /* no_ticket */
 753     {SSL_OP_CIPHER_SERVER_PREFERENCE, 0}, /* serverpref */
 754     /* legacy_renegotiation */
 755     {SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION, 0},
 756     /* legacy_server_connect */
 757     {SSL_OP_LEGACY_SERVER_CONNECT, 0},
 758     /* no_renegotiation */
 759     {SSL_OP_NO_RENEGOTIATION, 0},
 760     /* no_resumption_on_reneg */
 761     {SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION, 0},
 762     /* no_legacy_server_connect */
 763     {SSL_OP_LEGACY_SERVER_CONNECT, SSL_TFLAG_INV},
 764     /* allow_no_dhe_kex */
 765     {SSL_OP_ALLOW_NO_DHE_KEX, 0},
 766     /* chacha reprioritization */
 767     {SSL_OP_PRIORITIZE_CHACHA, 0},
 768     {SSL_CERT_FLAG_TLS_STRICT, SSL_TFLAG_CERT}, /* strict */
 769     /* no_middlebox */
 770     {SSL_OP_ENABLE_MIDDLEBOX_COMPAT, SSL_TFLAG_INV},
 771     /* anti_replay */
 772     {SSL_OP_NO_ANTI_REPLAY, SSL_TFLAG_INV},
 773     /* no_anti_replay */
 774     {SSL_OP_NO_ANTI_REPLAY, 0},
 775 };
 776
 777 static int ssl_conf_cmd_skip_prefix(SSL_CONF_CTX *cctx, const char **pcmd)
 778 {
 779     if (pcmd == NULL || *pcmd == NULL)
 780         return 0;
 781     /* If a prefix is set, check and skip */
 782     if (cctx->prefix) {
 783         if (strlen(*pcmd) <= cctx->prefixlen)
 784             return 0;
 785         if (cctx->flags & SSL_CONF_FLAG_CMDLINE &&
 786             strncmp(*pcmd, cctx->prefix, cctx->prefixlen))
 787             return 0;
 788         if (cctx->flags & SSL_CONF_FLAG_FILE &&
 789             strncasecmp(*pcmd, cctx->prefix, cctx->prefixlen))
 790             return 0;
 791         *pcmd += cctx->prefixlen;
 792     } else if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
 793         if (**pcmd != '-' || !(*pcmd)[1])
 794             return 0;
 795         *pcmd += 1;
 796     }
 797     return 1;
 798 }
 799
 800 /* Determine if a command is allowed according to cctx flags */
 801 static int ssl_conf_cmd_allowed(SSL_CONF_CTX *cctx, const ssl_conf_cmd_tbl * t)
 802 {
 803     unsigned int tfl = t->flags;
 804     unsigned int cfl = cctx->flags;
 805     if ((tfl & SSL_CONF_FLAG_SERVER) && !(cfl & SSL_CONF_FLAG_SERVER))
 806         return 0;
 807     if ((tfl & SSL_CONF_FLAG_CLIENT) && !(cfl & SSL_CONF_FLAG_CLIENT))
 808         return 0;
 809     if ((tfl & SSL_CONF_FLAG_CERTIFICATE)
 810         && !(cfl & SSL_CONF_FLAG_CERTIFICATE))
 811         return 0;
 812     return 1;
 813 }
 814
 815 static const ssl_conf_cmd_tbl *ssl_conf_cmd_lookup(SSL_CONF_CTX *cctx,
 816                                                    const char *cmd)
 817 {
 818     const ssl_conf_cmd_tbl *t;
 819     size_t i;
 820     if (cmd == NULL)
 821         return NULL;
 822
 823     /* Look for matching parameter name in table */
 824     for (i = 0, t = ssl_conf_cmds; i < OSSL_NELEM(ssl_conf_cmds); i++, t++) {
 825         if (ssl_conf_cmd_allowed(cctx, t)) {
 826             if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
 827                 if (t->str_cmdline && strcmp(t->str_cmdline, cmd) == 0)
 828                     return t;
 829             }
 830             if (cctx->flags & SSL_CONF_FLAG_FILE) {
 831                 if (t->str_file && strcasecmp(t->str_file, cmd) == 0)
 832                     return t;
 833             }
 834         }
 835     }
 836     return NULL;
 837 }
 838
 839 static int ctrl_switch_option(SSL_CONF_CTX *cctx, const ssl_conf_cmd_tbl * cmd)
 840 {
 841     /* Find index of command in table */
 842     size_t idx = cmd - ssl_conf_cmds;
 843     const ssl_switch_tbl *scmd;
 844     /* Sanity check index */
 845     if (idx >= OSSL_NELEM(ssl_cmd_switches))
 846         return 0;
 847     /* Obtain switches entry with same index */
 848     scmd = ssl_cmd_switches + idx;
 849     ssl_set_option(cctx, scmd->name_flags, scmd->option_value, 1);
 850     return 1;
 851 }
 852
 853 int SSL_CONF_cmd(SSL_CONF_CTX *cctx, const char *cmd, const char *value)
 854 {
 855     const ssl_conf_cmd_tbl *runcmd;
 856     if (cmd == NULL) {
 857         SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_INVALID_NULL_CMD_NAME);
 858         return 0;
 859     }
 860
 861     if (!ssl_conf_cmd_skip_prefix(cctx, &cmd))
 862         return -2;
 863
 864     runcmd = ssl_conf_cmd_lookup(cctx, cmd);
 865
 866     if (runcmd) {
 867         int rv;
 868         if (runcmd->value_type == SSL_CONF_TYPE_NONE) {
 869             return ctrl_switch_option(cctx, runcmd);
 870         }
 871         if (value == NULL)
 872             return -3;
 873         rv = runcmd->cmd(cctx, value);
 874         if (rv > 0)
 875             return 2;
 876         if (rv == -2)
 877             return -2;
 878         if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS) {
 879             SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_BAD_VALUE);
 880             ERR_add_error_data(4, "cmd=", cmd, ", value=", value);
 881         }
 882         return 0;
 883     }
 884
 885     if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS) {
 886         SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_UNKNOWN_CMD_NAME);
 887         ERR_add_error_data(2, "cmd=", cmd);
 888     }
 889
 890     return -2;
 891 }
 892
 893 int SSL_CONF_cmd_argv(SSL_CONF_CTX *cctx, int *pargc, char ***pargv)
 894 {
 895     int rv;
 896     const char *arg = NULL, *argn;
 897
 898     if (pargc != NULL && *pargc == 0)
 899         return 0;
 900     if (pargc == NULL || *pargc > 0)
 901         arg = **pargv;
 902     if (arg == NULL)
 903         return 0;
 904     if (pargc == NULL || *pargc > 1)
 905         argn = (*pargv)[1];
 906     else
 907         argn = NULL;
 908     cctx->flags &= ~SSL_CONF_FLAG_FILE;
 909     cctx->flags |= SSL_CONF_FLAG_CMDLINE;
 910     rv = SSL_CONF_cmd(cctx, arg, argn);
 911     if (rv > 0) {
 912         /* Success: update pargc, pargv */
 913         (*pargv) += rv;
 914         if (pargc)
 915             (*pargc) -= rv;
 916         return rv;
 917     }
 918     /* Unknown switch: indicate no arguments processed */
 919     if (rv == -2)
 920         return 0;
 921     /* Some error occurred processing command, return fatal error */
 922     if (rv == 0)
 923         return -1;
 924     return rv;
 925 }
 926
 927 int SSL_CONF_cmd_value_type(SSL_CONF_CTX *cctx, const char *cmd)
 928 {
 929     if (ssl_conf_cmd_skip_prefix(cctx, &cmd)) {
 930         const ssl_conf_cmd_tbl *runcmd;
 931         runcmd = ssl_conf_cmd_lookup(cctx, cmd);
 932         if (runcmd)
 933             return runcmd->value_type;
 934     }
 935     return SSL_CONF_TYPE_UNKNOWN;
 936 }
 937
 938 SSL_CONF_CTX *SSL_CONF_CTX_new(void)
 939 {
 940     SSL_CONF_CTX *ret = OPENSSL_zalloc(sizeof(*ret));
 941
 942     return ret;
 943 }
 944
 945 int SSL_CONF_CTX_finish(SSL_CONF_CTX *cctx)
 946 {
 947     /* See if any certificates are missing private keys */
 948     size_t i;
 949     CERT *c = NULL;
 950     if (cctx->ctx)
 951         c = cctx->ctx->cert;
 952     else if (cctx->ssl)
 953         c = cctx->ssl->cert;
 954     if (c && cctx->flags & SSL_CONF_FLAG_REQUIRE_PRIVATE) {
 955         for (i = 0; i < SSL_PKEY_NUM; i++) {
 956             const char *p = cctx->cert_filename[i];
 957             /*
 958              * If missing private key try to load one from certificate file
 959              */
 960             if (p && !c->pkeys[i].privatekey) {
 961                 if (!cmd_PrivateKey(cctx, p))
 962                     return 0;
 963             }
 964         }
 965     }
 966     if (cctx->canames) {
 967         if (cctx->ssl)
 968             SSL_set0_CA_list(cctx->ssl, cctx->canames);
 969         else if (cctx->ctx)
 970             SSL_CTX_set0_CA_list(cctx->ctx, cctx->canames);
 971         else
 972             sk_X509_NAME_pop_free(cctx->canames, X509_NAME_free);
 973         cctx->canames = NULL;
 974     }
 975     return 1;
 976 }
 977
 978 void SSL_CONF_CTX_free(SSL_CONF_CTX *cctx)
 979 {
 980     if (cctx) {
 981         size_t i;
 982         for (i = 0; i < SSL_PKEY_NUM; i++)
 983             OPENSSL_free(cctx->cert_filename[i]);
 984         OPENSSL_free(cctx->prefix);
 985         sk_X509_NAME_pop_free(cctx->canames, X509_NAME_free);
 986         OPENSSL_free(cctx);
 987     }
 988 }
 989
 990 unsigned int SSL_CONF_CTX_set_flags(SSL_CONF_CTX *cctx, unsigned int flags)
 991 {
 992     cctx->flags |= flags;
 993     return cctx->flags;
 994 }
 995
 996 unsigned int SSL_CONF_CTX_clear_flags(SSL_CONF_CTX *cctx, unsigned int flags)
 997 {
 998     cctx->flags &= ~flags;
 999     return cctx->flags;
1000 }
1001
1002 int SSL_CONF_CTX_set1_prefix(SSL_CONF_CTX *cctx, const char *pre)
1003 {
1004     char *tmp = NULL;
1005     if (pre) {
1006         tmp = OPENSSL_strdup(pre);
1007         if (tmp == NULL)
1008             return 0;
1009     }
1010     OPENSSL_free(cctx->prefix);
1011     cctx->prefix = tmp;
1012     if (tmp)
1013         cctx->prefixlen = strlen(tmp);
1014     else
1015         cctx->prefixlen = 0;
1016     return 1;
1017 }
1018
1019 void SSL_CONF_CTX_set_ssl(SSL_CONF_CTX *cctx, SSL *ssl)
1020 {
1021     cctx->ssl = ssl;
1022     cctx->ctx = NULL;
1023     if (ssl) {
1024         cctx->poptions = &ssl->options;
1025         cctx->min_version = &ssl->min_proto_version;
1026         cctx->max_version = &ssl->max_proto_version;
1027         cctx->pcert_flags = &ssl->cert->cert_flags;
1028         cctx->pvfy_flags = &ssl->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 }
1037
1038 void SSL_CONF_CTX_set_ssl_ctx(SSL_CONF_CTX *cctx, SSL_CTX *ctx)
1039 {
1040     cctx->ctx = ctx;
1041     cctx->ssl = NULL;
1042     if (ctx) {
1043         cctx->poptions = &ctx->options;
1044         cctx->min_version = &ctx->min_proto_version;
1045         cctx->max_version = &ctx->max_proto_version;
1046         cctx->pcert_flags = &ctx->cert->cert_flags;
1047         cctx->pvfy_flags = &ctx->verify_mode;
1048     } else {
1049         cctx->poptions = NULL;
1050         cctx->min_version = NULL;
1051         cctx->max_version = NULL;
1052         cctx->pcert_flags = NULL;
1053         cctx->pvfy_flags = NULL;
1054     }
1055 }