ssl/ssl_conf.c

   1 /*
   2  * Copyright 2012-2018 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <stdio.h>
  11 #include "ssl_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     };
 388     if (value == NULL)
 389         return -3;
 390     cctx->tbl = ssl_option_list;
 391     cctx->ntbl = OSSL_NELEM(ssl_option_list);
 392     return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
 393 }
 394
 395 static int cmd_VerifyMode(SSL_CONF_CTX *cctx, const char *value)
 396 {
 397     static const ssl_flag_tbl ssl_vfy_list[] = {
 398         SSL_FLAG_VFY_CLI("Peer", SSL_VERIFY_PEER),
 399         SSL_FLAG_VFY_SRV("Request", SSL_VERIFY_PEER),
 400         SSL_FLAG_VFY_SRV("Require",
 401                          SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT),
 402         SSL_FLAG_VFY_SRV("Once", SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE),
 403         SSL_FLAG_VFY_SRV("RequestPostHandshake",
 404                          SSL_VERIFY_PEER | SSL_VERIFY_POST_HANDSHAKE),
 405         SSL_FLAG_VFY_SRV("RequirePostHandshake",
 406                          SSL_VERIFY_PEER | SSL_VERIFY_POST_HANDSHAKE |
 407                          SSL_VERIFY_FAIL_IF_NO_PEER_CERT),
 408     };
 409     if (value == NULL)
 410         return -3;
 411     cctx->tbl = ssl_vfy_list;
 412     cctx->ntbl = OSSL_NELEM(ssl_vfy_list);
 413     return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
 414 }
 415
 416 static int cmd_Certificate(SSL_CONF_CTX *cctx, const char *value)
 417 {
 418     int rv = 1;
 419     CERT *c = NULL;
 420     if (cctx->ctx) {
 421         rv = SSL_CTX_use_certificate_chain_file(cctx->ctx, value);
 422         c = cctx->ctx->cert;
 423     }
 424     if (cctx->ssl) {
 425         rv = SSL_use_certificate_chain_file(cctx->ssl, value);
 426         c = cctx->ssl->cert;
 427     }
 428     if (rv > 0 && c && cctx->flags & SSL_CONF_FLAG_REQUIRE_PRIVATE) {
 429         char **pfilename = &cctx->cert_filename[c->key - c->pkeys];
 430         OPENSSL_free(*pfilename);
 431         *pfilename = OPENSSL_strdup(value);
 432         if (*pfilename == NULL)
 433             rv = 0;
 434     }
 435
 436     return rv > 0;
 437 }
 438
 439 static int cmd_PrivateKey(SSL_CONF_CTX *cctx, const char *value)
 440 {
 441     int rv = 1;
 442     if (!(cctx->flags & SSL_CONF_FLAG_CERTIFICATE))
 443         return -2;
 444     if (cctx->ctx)
 445         rv = SSL_CTX_use_PrivateKey_file(cctx->ctx, value, SSL_FILETYPE_PEM);
 446     if (cctx->ssl)
 447         rv = SSL_use_PrivateKey_file(cctx->ssl, value, SSL_FILETYPE_PEM);
 448     return rv > 0;
 449 }
 450
 451 static int cmd_ServerInfoFile(SSL_CONF_CTX *cctx, const char *value)
 452 {
 453     int rv = 1;
 454     if (cctx->ctx)
 455         rv = SSL_CTX_use_serverinfo_file(cctx->ctx, value);
 456     return rv > 0;
 457 }
 458
 459 static int do_store(SSL_CONF_CTX *cctx,
 460                     const char *CAfile, const char *CApath, const char *CAstore,
 461                     int verify_store)
 462 {
 463     CERT *cert;
 464     X509_STORE **st;
 465
 466     if (cctx->ctx)
 467         cert = cctx->ctx->cert;
 468     else if (cctx->ssl)
 469         cert = cctx->ssl->cert;
 470     else
 471         return 1;
 472     st = verify_store ? &cert->verify_store : &cert->chain_store;
 473     if (*st == NULL) {
 474         *st = X509_STORE_new();
 475         if (*st == NULL)
 476             return 0;
 477     }
 478
 479     if (CAfile != NULL && !X509_STORE_load_file(*st, CAfile))
 480         return 0;
 481     if (CApath != NULL && !X509_STORE_load_path(*st, CApath))
 482         return 0;
 483     if (CAstore != NULL && !X509_STORE_load_store(*st, CAstore))
 484         return 0;
 485     return 1;
 486 }
 487
 488 static int cmd_ChainCAPath(SSL_CONF_CTX *cctx, const char *value)
 489 {
 490     return do_store(cctx, NULL, value, NULL, 0);
 491 }
 492
 493 static int cmd_ChainCAFile(SSL_CONF_CTX *cctx, const char *value)
 494 {
 495     return do_store(cctx, value, NULL, NULL, 0);
 496 }
 497
 498 static int cmd_ChainCAStore(SSL_CONF_CTX *cctx, const char *value)
 499 {
 500     return do_store(cctx, NULL, NULL, value, 0);
 501 }
 502
 503 static int cmd_VerifyCAPath(SSL_CONF_CTX *cctx, const char *value)
 504 {
 505     return do_store(cctx, NULL, value, NULL, 1);
 506 }
 507
 508 static int cmd_VerifyCAFile(SSL_CONF_CTX *cctx, const char *value)
 509 {
 510     return do_store(cctx, value, NULL, NULL, 1);
 511 }
 512
 513 static int cmd_VerifyCAStore(SSL_CONF_CTX *cctx, const char *value)
 514 {
 515     return do_store(cctx, NULL, NULL, value, 1);
 516 }
 517
 518 static int cmd_RequestCAFile(SSL_CONF_CTX *cctx, const char *value)
 519 {
 520     if (cctx->canames == NULL)
 521         cctx->canames = sk_X509_NAME_new_null();
 522     if (cctx->canames == NULL)
 523         return 0;
 524     return SSL_add_file_cert_subjects_to_stack(cctx->canames, value);
 525 }
 526
 527 static int cmd_ClientCAFile(SSL_CONF_CTX *cctx, const char *value)
 528 {
 529     return cmd_RequestCAFile(cctx, value);
 530 }
 531
 532 static int cmd_RequestCAPath(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_dir_cert_subjects_to_stack(cctx->canames, value);
 539 }
 540
 541 static int cmd_ClientCAPath(SSL_CONF_CTX *cctx, const char *value)
 542 {
 543     return cmd_RequestCAPath(cctx, value);
 544 }
 545
 546 static int cmd_RequestCAStore(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_store_cert_subjects_to_stack(cctx->canames, value);
 553 }
 554
 555 static int cmd_ClientCAStore(SSL_CONF_CTX *cctx, const char *value)
 556 {
 557     return cmd_RequestCAStore(cctx, value);
 558 }
 559
 560 #ifndef OPENSSL_NO_DH
 561 static int cmd_DHParameters(SSL_CONF_CTX *cctx, const char *value)
 562 {
 563     int rv = 0;
 564     DH *dh = NULL;
 565     BIO *in = NULL;
 566     if (cctx->ctx || cctx->ssl) {
 567         in = BIO_new(BIO_s_file());
 568         if (in == NULL)
 569             goto end;
 570         if (BIO_read_filename(in, value) <= 0)
 571             goto end;
 572         dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL);
 573         if (dh == NULL)
 574             goto end;
 575     } else
 576         return 1;
 577     if (cctx->ctx)
 578         rv = SSL_CTX_set_tmp_dh(cctx->ctx, dh);
 579     if (cctx->ssl)
 580         rv = SSL_set_tmp_dh(cctx->ssl, dh);
 581  end:
 582     DH_free(dh);
 583     BIO_free(in);
 584     return rv > 0;
 585 }
 586 #endif
 587
 588 static int cmd_RecordPadding(SSL_CONF_CTX *cctx, const char *value)
 589 {
 590     int rv = 0;
 591     int block_size = atoi(value);
 592
 593     /*
 594      * All we care about is a non-negative value,
 595      * the setters check the range
 596      */
 597     if (block_size >= 0) {
 598         if (cctx->ctx)
 599             rv = SSL_CTX_set_block_padding(cctx->ctx, block_size);
 600         if (cctx->ssl)
 601             rv = SSL_set_block_padding(cctx->ssl, block_size);
 602     }
 603     return rv;
 604 }
 605
 606
 607 static int cmd_NumTickets(SSL_CONF_CTX *cctx, const char *value)
 608 {
 609     int rv = 0;
 610     int num_tickets = atoi(value);
 611
 612     if (num_tickets >= 0) {
 613         if (cctx->ctx)
 614             rv = SSL_CTX_set_num_tickets(cctx->ctx, num_tickets);
 615         if (cctx->ssl)
 616             rv = SSL_set_num_tickets(cctx->ssl, num_tickets);
 617     }
 618     return rv;
 619 }
 620
 621 typedef struct {
 622     int (*cmd) (SSL_CONF_CTX *cctx, const char *value);
 623     const char *str_file;
 624     const char *str_cmdline;
 625     unsigned short flags;
 626     unsigned short value_type;
 627 } ssl_conf_cmd_tbl;
 628
 629 /* Table of supported parameters */
 630
 631 #define SSL_CONF_CMD(name, cmdopt, flags, type) \
 632         {cmd_##name, #name, cmdopt, flags, type}
 633
 634 #define SSL_CONF_CMD_STRING(name, cmdopt, flags) \
 635         SSL_CONF_CMD(name, cmdopt, flags, SSL_CONF_TYPE_STRING)
 636
 637 #define SSL_CONF_CMD_SWITCH(name, flags) \
 638         {0, NULL, name, flags, SSL_CONF_TYPE_NONE}
 639
 640 /* See apps/apps.h if you change this table. */
 641 static const ssl_conf_cmd_tbl ssl_conf_cmds[] = {
 642     SSL_CONF_CMD_SWITCH("no_ssl3", 0),
 643     SSL_CONF_CMD_SWITCH("no_tls1", 0),
 644     SSL_CONF_CMD_SWITCH("no_tls1_1", 0),
 645     SSL_CONF_CMD_SWITCH("no_tls1_2", 0),
 646     SSL_CONF_CMD_SWITCH("no_tls1_3", 0),
 647     SSL_CONF_CMD_SWITCH("bugs", 0),
 648     SSL_CONF_CMD_SWITCH("no_comp", 0),
 649     SSL_CONF_CMD_SWITCH("comp", 0),
 650     SSL_CONF_CMD_SWITCH("ecdh_single", SSL_CONF_FLAG_SERVER),
 651     SSL_CONF_CMD_SWITCH("no_ticket", 0),
 652     SSL_CONF_CMD_SWITCH("serverpref", SSL_CONF_FLAG_SERVER),
 653     SSL_CONF_CMD_SWITCH("legacy_renegotiation", 0),
 654     SSL_CONF_CMD_SWITCH("legacy_server_connect", SSL_CONF_FLAG_SERVER),
 655     SSL_CONF_CMD_SWITCH("no_renegotiation", 0),
 656     SSL_CONF_CMD_SWITCH("no_resumption_on_reneg", SSL_CONF_FLAG_SERVER),
 657     SSL_CONF_CMD_SWITCH("no_legacy_server_connect", SSL_CONF_FLAG_SERVER),
 658     SSL_CONF_CMD_SWITCH("allow_no_dhe_kex", 0),
 659     SSL_CONF_CMD_SWITCH("prioritize_chacha", SSL_CONF_FLAG_SERVER),
 660     SSL_CONF_CMD_SWITCH("strict", 0),
 661     SSL_CONF_CMD_SWITCH("no_middlebox", 0),
 662     SSL_CONF_CMD_SWITCH("anti_replay", SSL_CONF_FLAG_SERVER),
 663     SSL_CONF_CMD_SWITCH("no_anti_replay", SSL_CONF_FLAG_SERVER),
 664     SSL_CONF_CMD_STRING(SignatureAlgorithms, "sigalgs", 0),
 665     SSL_CONF_CMD_STRING(ClientSignatureAlgorithms, "client_sigalgs", 0),
 666     SSL_CONF_CMD_STRING(Curves, "curves", 0),
 667     SSL_CONF_CMD_STRING(Groups, "groups", 0),
 668 #ifndef OPENSSL_NO_EC
 669     SSL_CONF_CMD_STRING(ECDHParameters, "named_curve", SSL_CONF_FLAG_SERVER),
 670 #endif
 671     SSL_CONF_CMD_STRING(CipherString, "cipher", 0),
 672     SSL_CONF_CMD_STRING(Ciphersuites, "ciphersuites", 0),
 673     SSL_CONF_CMD_STRING(Protocol, NULL, 0),
 674     SSL_CONF_CMD_STRING(MinProtocol, "min_protocol", 0),
 675     SSL_CONF_CMD_STRING(MaxProtocol, "max_protocol", 0),
 676     SSL_CONF_CMD_STRING(Options, NULL, 0),
 677     SSL_CONF_CMD_STRING(VerifyMode, NULL, 0),
 678     SSL_CONF_CMD(Certificate, "cert", SSL_CONF_FLAG_CERTIFICATE,
 679                  SSL_CONF_TYPE_FILE),
 680     SSL_CONF_CMD(PrivateKey, "key", SSL_CONF_FLAG_CERTIFICATE,
 681                  SSL_CONF_TYPE_FILE),
 682     SSL_CONF_CMD(ServerInfoFile, NULL,
 683                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 684                  SSL_CONF_TYPE_FILE),
 685     SSL_CONF_CMD(ChainCAPath, "chainCApath", SSL_CONF_FLAG_CERTIFICATE,
 686                  SSL_CONF_TYPE_DIR),
 687     SSL_CONF_CMD(ChainCAFile, "chainCAfile", SSL_CONF_FLAG_CERTIFICATE,
 688                  SSL_CONF_TYPE_FILE),
 689     SSL_CONF_CMD(ChainCAStore, "chainCAstore", SSL_CONF_FLAG_CERTIFICATE,
 690                  SSL_CONF_TYPE_STORE),
 691     SSL_CONF_CMD(VerifyCAPath, "verifyCApath", SSL_CONF_FLAG_CERTIFICATE,
 692                  SSL_CONF_TYPE_DIR),
 693     SSL_CONF_CMD(VerifyCAFile, "verifyCAfile", SSL_CONF_FLAG_CERTIFICATE,
 694                  SSL_CONF_TYPE_FILE),
 695     SSL_CONF_CMD(VerifyCAStore, "verifyCAstore", SSL_CONF_FLAG_CERTIFICATE,
 696                  SSL_CONF_TYPE_STORE),
 697     SSL_CONF_CMD(RequestCAFile, "requestCAFile", SSL_CONF_FLAG_CERTIFICATE,
 698                  SSL_CONF_TYPE_FILE),
 699     SSL_CONF_CMD(ClientCAFile, NULL,
 700                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 701                  SSL_CONF_TYPE_FILE),
 702     SSL_CONF_CMD(RequestCAPath, NULL, SSL_CONF_FLAG_CERTIFICATE,
 703                  SSL_CONF_TYPE_DIR),
 704     SSL_CONF_CMD(ClientCAPath, NULL,
 705                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 706                  SSL_CONF_TYPE_DIR),
 707     SSL_CONF_CMD(RequestCAStore, "requestCAStore", SSL_CONF_FLAG_CERTIFICATE,
 708                  SSL_CONF_TYPE_STORE),
 709     SSL_CONF_CMD(ClientCAStore, NULL,
 710                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 711                  SSL_CONF_TYPE_STORE),
 712 #ifndef OPENSSL_NO_DH
 713     SSL_CONF_CMD(DHParameters, "dhparam",
 714                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 715                  SSL_CONF_TYPE_FILE),
 716 #endif
 717     SSL_CONF_CMD_STRING(RecordPadding, "record_padding", 0),
 718     SSL_CONF_CMD_STRING(NumTickets, "num_tickets", SSL_CONF_FLAG_SERVER),
 719 };
 720
 721 /* Supported switches: must match order of switches in ssl_conf_cmds */
 722 static const ssl_switch_tbl ssl_cmd_switches[] = {
 723     {SSL_OP_NO_SSLv3, 0},       /* no_ssl3 */
 724     {SSL_OP_NO_TLSv1, 0},       /* no_tls1 */
 725     {SSL_OP_NO_TLSv1_1, 0},     /* no_tls1_1 */
 726     {SSL_OP_NO_TLSv1_2, 0},     /* no_tls1_2 */
 727     {SSL_OP_NO_TLSv1_3, 0},     /* no_tls1_3 */
 728     {SSL_OP_ALL, 0},            /* bugs */
 729     {SSL_OP_NO_COMPRESSION, 0}, /* no_comp */
 730     {SSL_OP_NO_COMPRESSION, SSL_TFLAG_INV}, /* comp */
 731     {SSL_OP_SINGLE_ECDH_USE, 0}, /* ecdh_single */
 732     {SSL_OP_NO_TICKET, 0},      /* no_ticket */
 733     {SSL_OP_CIPHER_SERVER_PREFERENCE, 0}, /* serverpref */
 734     /* legacy_renegotiation */
 735     {SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION, 0},
 736     /* legacy_server_connect */
 737     {SSL_OP_LEGACY_SERVER_CONNECT, 0},
 738     /* no_renegotiation */
 739     {SSL_OP_NO_RENEGOTIATION, 0},
 740     /* no_resumption_on_reneg */
 741     {SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION, 0},
 742     /* no_legacy_server_connect */
 743     {SSL_OP_LEGACY_SERVER_CONNECT, SSL_TFLAG_INV},
 744     /* allow_no_dhe_kex */
 745     {SSL_OP_ALLOW_NO_DHE_KEX, 0},
 746     /* chacha reprioritization */
 747     {SSL_OP_PRIORITIZE_CHACHA, 0},
 748     {SSL_CERT_FLAG_TLS_STRICT, SSL_TFLAG_CERT}, /* strict */
 749     /* no_middlebox */
 750     {SSL_OP_ENABLE_MIDDLEBOX_COMPAT, SSL_TFLAG_INV},
 751     /* anti_replay */
 752     {SSL_OP_NO_ANTI_REPLAY, SSL_TFLAG_INV},
 753     /* no_anti_replay */
 754     {SSL_OP_NO_ANTI_REPLAY, 0},
 755 };
 756
 757 static int ssl_conf_cmd_skip_prefix(SSL_CONF_CTX *cctx, const char **pcmd)
 758 {
 759     if (pcmd == NULL || *pcmd == NULL)
 760         return 0;
 761     /* If a prefix is set, check and skip */
 762     if (cctx->prefix) {
 763         if (strlen(*pcmd) <= cctx->prefixlen)
 764             return 0;
 765         if (cctx->flags & SSL_CONF_FLAG_CMDLINE &&
 766             strncmp(*pcmd, cctx->prefix, cctx->prefixlen))
 767             return 0;
 768         if (cctx->flags & SSL_CONF_FLAG_FILE &&
 769             strncasecmp(*pcmd, cctx->prefix, cctx->prefixlen))
 770             return 0;
 771         *pcmd += cctx->prefixlen;
 772     } else if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
 773         if (**pcmd != '-' || !(*pcmd)[1])
 774             return 0;
 775         *pcmd += 1;
 776     }
 777     return 1;
 778 }
 779
 780 /* Determine if a command is allowed according to cctx flags */
 781 static int ssl_conf_cmd_allowed(SSL_CONF_CTX *cctx, const ssl_conf_cmd_tbl * t)
 782 {
 783     unsigned int tfl = t->flags;
 784     unsigned int cfl = cctx->flags;
 785     if ((tfl & SSL_CONF_FLAG_SERVER) && !(cfl & SSL_CONF_FLAG_SERVER))
 786         return 0;
 787     if ((tfl & SSL_CONF_FLAG_CLIENT) && !(cfl & SSL_CONF_FLAG_CLIENT))
 788         return 0;
 789     if ((tfl & SSL_CONF_FLAG_CERTIFICATE)
 790         && !(cfl & SSL_CONF_FLAG_CERTIFICATE))
 791         return 0;
 792     return 1;
 793 }
 794
 795 static const ssl_conf_cmd_tbl *ssl_conf_cmd_lookup(SSL_CONF_CTX *cctx,
 796                                                    const char *cmd)
 797 {
 798     const ssl_conf_cmd_tbl *t;
 799     size_t i;
 800     if (cmd == NULL)
 801         return NULL;
 802
 803     /* Look for matching parameter name in table */
 804     for (i = 0, t = ssl_conf_cmds; i < OSSL_NELEM(ssl_conf_cmds); i++, t++) {
 805         if (ssl_conf_cmd_allowed(cctx, t)) {
 806             if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
 807                 if (t->str_cmdline && strcmp(t->str_cmdline, cmd) == 0)
 808                     return t;
 809             }
 810             if (cctx->flags & SSL_CONF_FLAG_FILE) {
 811                 if (t->str_file && strcasecmp(t->str_file, cmd) == 0)
 812                     return t;
 813             }
 814         }
 815     }
 816     return NULL;
 817 }
 818
 819 static int ctrl_switch_option(SSL_CONF_CTX *cctx, const ssl_conf_cmd_tbl * cmd)
 820 {
 821     /* Find index of command in table */
 822     size_t idx = cmd - ssl_conf_cmds;
 823     const ssl_switch_tbl *scmd;
 824     /* Sanity check index */
 825     if (idx >= OSSL_NELEM(ssl_cmd_switches))
 826         return 0;
 827     /* Obtain switches entry with same index */
 828     scmd = ssl_cmd_switches + idx;
 829     ssl_set_option(cctx, scmd->name_flags, scmd->option_value, 1);
 830     return 1;
 831 }
 832
 833 int SSL_CONF_cmd(SSL_CONF_CTX *cctx, const char *cmd, const char *value)
 834 {
 835     const ssl_conf_cmd_tbl *runcmd;
 836     if (cmd == NULL) {
 837         SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_INVALID_NULL_CMD_NAME);
 838         return 0;
 839     }
 840
 841     if (!ssl_conf_cmd_skip_prefix(cctx, &cmd))
 842         return -2;
 843
 844     runcmd = ssl_conf_cmd_lookup(cctx, cmd);
 845
 846     if (runcmd) {
 847         int rv;
 848         if (runcmd->value_type == SSL_CONF_TYPE_NONE) {
 849             return ctrl_switch_option(cctx, runcmd);
 850         }
 851         if (value == NULL)
 852             return -3;
 853         rv = runcmd->cmd(cctx, value);
 854         if (rv > 0)
 855             return 2;
 856         if (rv == -2)
 857             return -2;
 858         if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS) {
 859             SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_BAD_VALUE);
 860             ERR_add_error_data(4, "cmd=", cmd, ", value=", value);
 861         }
 862         return 0;
 863     }
 864
 865     if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS) {
 866         SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_UNKNOWN_CMD_NAME);
 867         ERR_add_error_data(2, "cmd=", cmd);
 868     }
 869
 870     return -2;
 871 }
 872
 873 int SSL_CONF_cmd_argv(SSL_CONF_CTX *cctx, int *pargc, char ***pargv)
 874 {
 875     int rv;
 876     const char *arg = NULL, *argn;
 877
 878     if (pargc != NULL && *pargc == 0)
 879         return 0;
 880     if (pargc == NULL || *pargc > 0)
 881         arg = **pargv;
 882     if (arg == NULL)
 883         return 0;
 884     if (pargc == NULL || *pargc > 1)
 885         argn = (*pargv)[1];
 886     else
 887         argn = NULL;
 888     cctx->flags &= ~SSL_CONF_FLAG_FILE;
 889     cctx->flags |= SSL_CONF_FLAG_CMDLINE;
 890     rv = SSL_CONF_cmd(cctx, arg, argn);
 891     if (rv > 0) {
 892         /* Success: update pargc, pargv */
 893         (*pargv) += rv;
 894         if (pargc)
 895             (*pargc) -= rv;
 896         return rv;
 897     }
 898     /* Unknown switch: indicate no arguments processed */
 899     if (rv == -2)
 900         return 0;
 901     /* Some error occurred processing command, return fatal error */
 902     if (rv == 0)
 903         return -1;
 904     return rv;
 905 }
 906
 907 int SSL_CONF_cmd_value_type(SSL_CONF_CTX *cctx, const char *cmd)
 908 {
 909     if (ssl_conf_cmd_skip_prefix(cctx, &cmd)) {
 910         const ssl_conf_cmd_tbl *runcmd;
 911         runcmd = ssl_conf_cmd_lookup(cctx, cmd);
 912         if (runcmd)
 913             return runcmd->value_type;
 914     }
 915     return SSL_CONF_TYPE_UNKNOWN;
 916 }
 917
 918 SSL_CONF_CTX *SSL_CONF_CTX_new(void)
 919 {
 920     SSL_CONF_CTX *ret = OPENSSL_zalloc(sizeof(*ret));
 921
 922     return ret;
 923 }
 924
 925 int SSL_CONF_CTX_finish(SSL_CONF_CTX *cctx)
 926 {
 927     /* See if any certificates are missing private keys */
 928     size_t i;
 929     CERT *c = NULL;
 930     if (cctx->ctx)
 931         c = cctx->ctx->cert;
 932     else if (cctx->ssl)
 933         c = cctx->ssl->cert;
 934     if (c && cctx->flags & SSL_CONF_FLAG_REQUIRE_PRIVATE) {
 935         for (i = 0; i < SSL_PKEY_NUM; i++) {
 936             const char *p = cctx->cert_filename[i];
 937             /*
 938              * If missing private key try to load one from certificate file
 939              */
 940             if (p && !c->pkeys[i].privatekey) {
 941                 if (!cmd_PrivateKey(cctx, p))
 942                     return 0;
 943             }
 944         }
 945     }
 946     if (cctx->canames) {
 947         if (cctx->ssl)
 948             SSL_set0_CA_list(cctx->ssl, cctx->canames);
 949         else if (cctx->ctx)
 950             SSL_CTX_set0_CA_list(cctx->ctx, cctx->canames);
 951         else
 952             sk_X509_NAME_pop_free(cctx->canames, X509_NAME_free);
 953         cctx->canames = NULL;
 954     }
 955     return 1;
 956 }
 957
 958 void SSL_CONF_CTX_free(SSL_CONF_CTX *cctx)
 959 {
 960     if (cctx) {
 961         size_t i;
 962         for (i = 0; i < SSL_PKEY_NUM; i++)
 963             OPENSSL_free(cctx->cert_filename[i]);
 964         OPENSSL_free(cctx->prefix);
 965         sk_X509_NAME_pop_free(cctx->canames, X509_NAME_free);
 966         OPENSSL_free(cctx);
 967     }
 968 }
 969
 970 unsigned int SSL_CONF_CTX_set_flags(SSL_CONF_CTX *cctx, unsigned int flags)
 971 {
 972     cctx->flags |= flags;
 973     return cctx->flags;
 974 }
 975
 976 unsigned int SSL_CONF_CTX_clear_flags(SSL_CONF_CTX *cctx, unsigned int flags)
 977 {
 978     cctx->flags &= ~flags;
 979     return cctx->flags;
 980 }
 981
 982 int SSL_CONF_CTX_set1_prefix(SSL_CONF_CTX *cctx, const char *pre)
 983 {
 984     char *tmp = NULL;
 985     if (pre) {
 986         tmp = OPENSSL_strdup(pre);
 987         if (tmp == NULL)
 988             return 0;
 989     }
 990     OPENSSL_free(cctx->prefix);
 991     cctx->prefix = tmp;
 992     if (tmp)
 993         cctx->prefixlen = strlen(tmp);
 994     else
 995         cctx->prefixlen = 0;
 996     return 1;
 997 }
 998
 999 void SSL_CONF_CTX_set_ssl(SSL_CONF_CTX *cctx, SSL *ssl)
1000 {
1001     cctx->ssl = ssl;
1002     cctx->ctx = NULL;
1003     if (ssl) {
1004         cctx->poptions = &ssl->options;
1005         cctx->min_version = &ssl->min_proto_version;
1006         cctx->max_version = &ssl->max_proto_version;
1007         cctx->pcert_flags = &ssl->cert->cert_flags;
1008         cctx->pvfy_flags = &ssl->verify_mode;
1009     } else {
1010         cctx->poptions = NULL;
1011         cctx->min_version = NULL;
1012         cctx->max_version = NULL;
1013         cctx->pcert_flags = NULL;
1014         cctx->pvfy_flags = NULL;
1015     }
1016 }
1017
1018 void SSL_CONF_CTX_set_ssl_ctx(SSL_CONF_CTX *cctx, SSL_CTX *ctx)
1019 {
1020     cctx->ctx = ctx;
1021     cctx->ssl = NULL;
1022     if (ctx) {
1023         cctx->poptions = &ctx->options;
1024         cctx->min_version = &ctx->min_proto_version;
1025         cctx->max_version = &ctx->max_proto_version;
1026         cctx->pcert_flags = &ctx->cert->cert_flags;
1027         cctx->pvfy_flags = &ctx->verify_mode;
1028     } else {
1029         cctx->poptions = NULL;
1030         cctx->min_version = NULL;
1031         cctx->max_version = NULL;
1032         cctx->pcert_flags = NULL;
1033         cctx->pvfy_flags = NULL;
1034     }
1035 }