ssl/ssl_conf.c

   1 /*
   2  * Copyright 2012-2017 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <stdio.h>
  11 #include "ssl_locl.h"
  12 #include <openssl/conf.h>
  13 #include <openssl/objects.h>
  14 #include <openssl/dh.h>
  15 #include "internal/nelem.h"
  16
  17 /*
  18  * structure holding name tables. This is used for permitted elements in lists
  19  * such as TLSv1.
  20  */
  21
  22 typedef struct {
  23     const char *name;
  24     int namelen;
  25     unsigned int name_flags;
  26     unsigned long option_value;
  27 } ssl_flag_tbl;
  28
  29 /* Switch table: use for single command line switches like no_tls2 */
  30 typedef struct {
  31     unsigned long option_value;
  32     unsigned int name_flags;
  33 } ssl_switch_tbl;
  34
  35 /* Sense of name is inverted e.g. "TLSv1" will clear SSL_OP_NO_TLSv1 */
  36 #define SSL_TFLAG_INV   0x1
  37 /* Mask for type of flag referred to */
  38 #define SSL_TFLAG_TYPE_MASK 0xf00
  39 /* Flag is for options */
  40 #define SSL_TFLAG_OPTION    0x000
  41 /* Flag is for cert_flags */
  42 #define SSL_TFLAG_CERT      0x100
  43 /* Flag is for verify mode */
  44 #define SSL_TFLAG_VFY       0x200
  45 /* Option can only be used for clients */
  46 #define SSL_TFLAG_CLIENT SSL_CONF_FLAG_CLIENT
  47 /* Option can only be used for servers */
  48 #define SSL_TFLAG_SERVER SSL_CONF_FLAG_SERVER
  49 #define SSL_TFLAG_BOTH (SSL_TFLAG_CLIENT|SSL_TFLAG_SERVER)
  50
  51 #define SSL_FLAG_TBL(str, flag) \
  52         {str, (int)(sizeof(str) - 1), SSL_TFLAG_BOTH, flag}
  53 #define SSL_FLAG_TBL_SRV(str, flag) \
  54         {str, (int)(sizeof(str) - 1), SSL_TFLAG_SERVER, flag}
  55 #define SSL_FLAG_TBL_CLI(str, flag) \
  56         {str, (int)(sizeof(str) - 1), SSL_TFLAG_CLIENT, flag}
  57 #define SSL_FLAG_TBL_INV(str, flag) \
  58         {str, (int)(sizeof(str) - 1), SSL_TFLAG_INV|SSL_TFLAG_BOTH, flag}
  59 #define SSL_FLAG_TBL_SRV_INV(str, flag) \
  60         {str, (int)(sizeof(str) - 1), SSL_TFLAG_INV|SSL_TFLAG_SERVER, flag}
  61 #define SSL_FLAG_TBL_CERT(str, flag) \
  62         {str, (int)(sizeof(str) - 1), SSL_TFLAG_CERT|SSL_TFLAG_BOTH, flag}
  63
  64 #define SSL_FLAG_VFY_CLI(str, flag) \
  65         {str, (int)(sizeof(str) - 1), SSL_TFLAG_VFY | SSL_TFLAG_CLIENT, flag}
  66 #define SSL_FLAG_VFY_SRV(str, flag) \
  67         {str, (int)(sizeof(str) - 1), SSL_TFLAG_VFY | SSL_TFLAG_SERVER, flag}
  68
  69 /*
  70  * Opaque structure containing SSL configuration context.
  71  */
  72
  73 struct ssl_conf_ctx_st {
  74     /*
  75      * Various flags indicating (among other things) which options we will
  76      * recognise.
  77      */
  78     unsigned int flags;
  79     /* Prefix and length of commands */
  80     char *prefix;
  81     size_t prefixlen;
  82     /* SSL_CTX or SSL structure to perform operations on */
  83     SSL_CTX *ctx;
  84     SSL *ssl;
  85     /* Pointer to SSL or SSL_CTX options field or NULL if none */
  86     uint32_t *poptions;
  87     /* Certificate filenames for each type */
  88     char *cert_filename[SSL_PKEY_NUM];
  89     /* Pointer to SSL or SSL_CTX cert_flags or NULL if none */
  90     uint32_t *pcert_flags;
  91     /* Pointer to SSL or SSL_CTX verify_mode or NULL if none */
  92     uint32_t *pvfy_flags;
  93     /* Pointer to SSL or SSL_CTX min_version field or NULL if none */
  94     int *min_version;
  95     /* Pointer to SSL or SSL_CTX max_version field or NULL if none */
  96     int *max_version;
  97     /* Current flag table being worked on */
  98     const ssl_flag_tbl *tbl;
  99     /* Size of table */
 100     size_t ntbl;
 101     /* Client CA names */
 102     STACK_OF(X509_NAME) *canames;
 103 };
 104
 105 static void ssl_set_option(SSL_CONF_CTX *cctx, unsigned int name_flags,
 106                            unsigned long option_value, int onoff)
 107 {
 108     uint32_t *pflags;
 109     if (cctx->poptions == NULL)
 110         return;
 111     if (name_flags & SSL_TFLAG_INV)
 112         onoff ^= 1;
 113     switch (name_flags & SSL_TFLAG_TYPE_MASK) {
 114
 115     case SSL_TFLAG_CERT:
 116         pflags = cctx->pcert_flags;
 117         break;
 118
 119     case SSL_TFLAG_VFY:
 120         pflags = cctx->pvfy_flags;
 121         break;
 122
 123     case SSL_TFLAG_OPTION:
 124         pflags = cctx->poptions;
 125         break;
 126
 127     default:
 128         return;
 129
 130     }
 131     if (onoff)
 132         *pflags |= option_value;
 133     else
 134         *pflags &= ~option_value;
 135 }
 136
 137 static int ssl_match_option(SSL_CONF_CTX *cctx, const ssl_flag_tbl *tbl,
 138                             const char *name, int namelen, int onoff)
 139 {
 140     /* If name not relevant for context skip */
 141     if (!(cctx->flags & tbl->name_flags & SSL_TFLAG_BOTH))
 142         return 0;
 143     if (namelen == -1) {
 144         if (strcmp(tbl->name, name))
 145             return 0;
 146     } else if (tbl->namelen != namelen || strncasecmp(tbl->name, name, namelen))
 147         return 0;
 148     ssl_set_option(cctx, tbl->name_flags, tbl->option_value, onoff);
 149     return 1;
 150 }
 151
 152 static int ssl_set_option_list(const char *elem, int len, void *usr)
 153 {
 154     SSL_CONF_CTX *cctx = usr;
 155     size_t i;
 156     const ssl_flag_tbl *tbl;
 157     int onoff = 1;
 158     /*
 159      * len == -1 indicates not being called in list context, just for single
 160      * command line switches, so don't allow +, -.
 161      */
 162     if (elem == NULL)
 163         return 0;
 164     if (len != -1) {
 165         if (*elem == '+') {
 166             elem++;
 167             len--;
 168             onoff = 1;
 169         } else if (*elem == '-') {
 170             elem++;
 171             len--;
 172             onoff = 0;
 173         }
 174     }
 175     for (i = 0, tbl = cctx->tbl; i < cctx->ntbl; i++, tbl++) {
 176         if (ssl_match_option(cctx, tbl, elem, len, onoff))
 177             return 1;
 178     }
 179     return 0;
 180 }
 181
 182 /* Set supported signature algorithms */
 183 static int cmd_SignatureAlgorithms(SSL_CONF_CTX *cctx, const char *value)
 184 {
 185     int rv;
 186     if (cctx->ssl)
 187         rv = SSL_set1_sigalgs_list(cctx->ssl, value);
 188     /* NB: ctx == NULL performs syntax checking only */
 189     else
 190         rv = SSL_CTX_set1_sigalgs_list(cctx->ctx, value);
 191     return rv > 0;
 192 }
 193
 194 /* Set supported client signature algorithms */
 195 static int cmd_ClientSignatureAlgorithms(SSL_CONF_CTX *cctx, const char *value)
 196 {
 197     int rv;
 198     if (cctx->ssl)
 199         rv = SSL_set1_client_sigalgs_list(cctx->ssl, value);
 200     /* NB: ctx == NULL performs syntax checking only */
 201     else
 202         rv = SSL_CTX_set1_client_sigalgs_list(cctx->ctx, value);
 203     return rv > 0;
 204 }
 205
 206 static int cmd_Groups(SSL_CONF_CTX *cctx, const char *value)
 207 {
 208     int rv;
 209     if (cctx->ssl)
 210         rv = SSL_set1_groups_list(cctx->ssl, value);
 211     /* NB: ctx == NULL performs syntax checking only */
 212     else
 213         rv = SSL_CTX_set1_groups_list(cctx->ctx, value);
 214     return rv > 0;
 215 }
 216
 217 /* This is the old name for cmd_Groups - retained for backwards compatibility */
 218 static int cmd_Curves(SSL_CONF_CTX *cctx, const char *value)
 219 {
 220     return cmd_Groups(cctx, value);
 221 }
 222
 223 #ifndef OPENSSL_NO_EC
 224 /* ECDH temporary parameters */
 225 static int cmd_ECDHParameters(SSL_CONF_CTX *cctx, const char *value)
 226 {
 227     int rv = 1;
 228     EC_KEY *ecdh;
 229     int nid;
 230
 231     /* Ignore values supported by 1.0.2 for the automatic selection */
 232     if ((cctx->flags & SSL_CONF_FLAG_FILE) &&
 233         strcasecmp(value, "+automatic") == 0)
 234         return 1;
 235     if ((cctx->flags & SSL_CONF_FLAG_CMDLINE) &&
 236         strcmp(value, "auto") == 0)
 237         return 1;
 238
 239     nid = EC_curve_nist2nid(value);
 240     if (nid == NID_undef)
 241         nid = OBJ_sn2nid(value);
 242     if (nid == 0)
 243         return 0;
 244     ecdh = EC_KEY_new_by_curve_name(nid);
 245     if (!ecdh)
 246         return 0;
 247     if (cctx->ctx)
 248         rv = SSL_CTX_set_tmp_ecdh(cctx->ctx, ecdh);
 249     else if (cctx->ssl)
 250         rv = SSL_set_tmp_ecdh(cctx->ssl, ecdh);
 251     EC_KEY_free(ecdh);
 252
 253     return rv > 0;
 254 }
 255 #endif
 256 static int cmd_CipherString(SSL_CONF_CTX *cctx, const char *value)
 257 {
 258     int rv = 1;
 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_Protocol(SSL_CONF_CTX *cctx, const char *value)
 267 {
 268     static const ssl_flag_tbl ssl_protocol_list[] = {
 269         SSL_FLAG_TBL_INV("ALL", SSL_OP_NO_SSL_MASK),
 270         SSL_FLAG_TBL_INV("SSLv2", SSL_OP_NO_SSLv2),
 271         SSL_FLAG_TBL_INV("SSLv3", SSL_OP_NO_SSLv3),
 272         SSL_FLAG_TBL_INV("TLSv1", SSL_OP_NO_TLSv1),
 273         SSL_FLAG_TBL_INV("TLSv1.1", SSL_OP_NO_TLSv1_1),
 274         SSL_FLAG_TBL_INV("TLSv1.2", SSL_OP_NO_TLSv1_2),
 275         SSL_FLAG_TBL_INV("TLSv1.3", SSL_OP_NO_TLSv1_3),
 276         SSL_FLAG_TBL_INV("DTLSv1", SSL_OP_NO_DTLSv1),
 277         SSL_FLAG_TBL_INV("DTLSv1.2", SSL_OP_NO_DTLSv1_2)
 278     };
 279     cctx->tbl = ssl_protocol_list;
 280     cctx->ntbl = OSSL_NELEM(ssl_protocol_list);
 281     return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
 282 }
 283
 284 /*
 285  * protocol_from_string - converts a protocol version string to a number
 286  *
 287  * Returns -1 on failure or the version on success
 288  */
 289 static int protocol_from_string(const char *value)
 290 {
 291     struct protocol_versions {
 292         const char *name;
 293         int version;
 294     };
 295     static const struct protocol_versions versions[] = {
 296         {"None", 0},
 297         {"SSLv3", SSL3_VERSION},
 298         {"TLSv1", TLS1_VERSION},
 299         {"TLSv1.1", TLS1_1_VERSION},
 300         {"TLSv1.2", TLS1_2_VERSION},
 301         {"TLSv1.3", TLS1_3_VERSION},
 302         {"DTLSv1", DTLS1_VERSION},
 303         {"DTLSv1.2", DTLS1_2_VERSION}
 304     };
 305     size_t i;
 306     size_t n = OSSL_NELEM(versions);
 307
 308     for (i = 0; i < n; i++)
 309         if (strcmp(versions[i].name, value) == 0)
 310             return versions[i].version;
 311     return -1;
 312 }
 313
 314 static int min_max_proto(SSL_CONF_CTX *cctx, const char *value, int *bound)
 315 {
 316     int method_version;
 317     int new_version;
 318
 319     if (cctx->ctx != NULL)
 320         method_version = cctx->ctx->method->version;
 321     else if (cctx->ssl != NULL)
 322         method_version = cctx->ssl->ctx->method->version;
 323     else
 324         return 0;
 325     if ((new_version = protocol_from_string(value)) < 0)
 326         return 0;
 327     return ssl_set_version_bound(method_version, new_version, bound);
 328 }
 329
 330 /*
 331  * cmd_MinProtocol - Set min protocol version
 332  * @cctx: config structure to save settings in
 333  * @value: The min protocol version in string form
 334  *
 335  * Returns 1 on success and 0 on failure.
 336  */
 337 static int cmd_MinProtocol(SSL_CONF_CTX *cctx, const char *value)
 338 {
 339     return min_max_proto(cctx, value, cctx->min_version);
 340 }
 341
 342 /*
 343  * cmd_MaxProtocol - Set max protocol version
 344  * @cctx: config structure to save settings in
 345  * @value: The max protocol version in string form
 346  *
 347  * Returns 1 on success and 0 on failure.
 348  */
 349 static int cmd_MaxProtocol(SSL_CONF_CTX *cctx, const char *value)
 350 {
 351     return min_max_proto(cctx, value, cctx->max_version);
 352 }
 353
 354 static int cmd_Options(SSL_CONF_CTX *cctx, const char *value)
 355 {
 356     static const ssl_flag_tbl ssl_option_list[] = {
 357         SSL_FLAG_TBL_INV("SessionTicket", SSL_OP_NO_TICKET),
 358         SSL_FLAG_TBL_INV("EmptyFragments",
 359                          SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS),
 360         SSL_FLAG_TBL("Bugs", SSL_OP_ALL),
 361         SSL_FLAG_TBL_INV("Compression", SSL_OP_NO_COMPRESSION),
 362         SSL_FLAG_TBL_SRV("ServerPreference", SSL_OP_CIPHER_SERVER_PREFERENCE),
 363         SSL_FLAG_TBL_SRV("NoResumptionOnRenegotiation",
 364                          SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION),
 365         SSL_FLAG_TBL_SRV("DHSingle", SSL_OP_SINGLE_DH_USE),
 366         SSL_FLAG_TBL_SRV("ECDHSingle", SSL_OP_SINGLE_ECDH_USE),
 367         SSL_FLAG_TBL("UnsafeLegacyRenegotiation",
 368                      SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION),
 369         SSL_FLAG_TBL_INV("EncryptThenMac", SSL_OP_NO_ENCRYPT_THEN_MAC),
 370         SSL_FLAG_TBL("NoRenegotiation", SSL_OP_NO_RENEGOTIATION),
 371         SSL_FLAG_TBL("AllowNoDHEKEX", SSL_OP_ALLOW_NO_DHE_KEX)
 372     };
 373     if (value == NULL)
 374         return -3;
 375     cctx->tbl = ssl_option_list;
 376     cctx->ntbl = OSSL_NELEM(ssl_option_list);
 377     return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
 378 }
 379
 380 static int cmd_VerifyMode(SSL_CONF_CTX *cctx, const char *value)
 381 {
 382     static const ssl_flag_tbl ssl_vfy_list[] = {
 383         SSL_FLAG_VFY_CLI("Peer", SSL_VERIFY_PEER),
 384         SSL_FLAG_VFY_SRV("Request", SSL_VERIFY_PEER),
 385         SSL_FLAG_VFY_SRV("Require",
 386                          SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT),
 387         SSL_FLAG_VFY_SRV("Once", SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE)
 388     };
 389     if (value == NULL)
 390         return -3;
 391     cctx->tbl = ssl_vfy_list;
 392     cctx->ntbl = OSSL_NELEM(ssl_vfy_list);
 393     return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
 394 }
 395
 396 static int cmd_Certificate(SSL_CONF_CTX *cctx, const char *value)
 397 {
 398     int rv = 1;
 399     CERT *c = NULL;
 400     if (cctx->ctx) {
 401         rv = SSL_CTX_use_certificate_chain_file(cctx->ctx, value);
 402         c = cctx->ctx->cert;
 403     }
 404     if (cctx->ssl) {
 405         rv = SSL_use_certificate_chain_file(cctx->ssl, value);
 406         c = cctx->ssl->cert;
 407     }
 408     if (rv > 0 && c && cctx->flags & SSL_CONF_FLAG_REQUIRE_PRIVATE) {
 409         char **pfilename = &cctx->cert_filename[c->key - c->pkeys];
 410         OPENSSL_free(*pfilename);
 411         *pfilename = OPENSSL_strdup(value);
 412         if (!*pfilename)
 413             rv = 0;
 414     }
 415
 416     return rv > 0;
 417 }
 418
 419 static int cmd_PrivateKey(SSL_CONF_CTX *cctx, const char *value)
 420 {
 421     int rv = 1;
 422     if (!(cctx->flags & SSL_CONF_FLAG_CERTIFICATE))
 423         return -2;
 424     if (cctx->ctx)
 425         rv = SSL_CTX_use_PrivateKey_file(cctx->ctx, value, SSL_FILETYPE_PEM);
 426     if (cctx->ssl)
 427         rv = SSL_use_PrivateKey_file(cctx->ssl, value, SSL_FILETYPE_PEM);
 428     return rv > 0;
 429 }
 430
 431 static int cmd_ServerInfoFile(SSL_CONF_CTX *cctx, const char *value)
 432 {
 433     int rv = 1;
 434     if (cctx->ctx)
 435         rv = SSL_CTX_use_serverinfo_file(cctx->ctx, value);
 436     return rv > 0;
 437 }
 438
 439 static int do_store(SSL_CONF_CTX *cctx,
 440                     const char *CAfile, const char *CApath, int verify_store)
 441 {
 442     CERT *cert;
 443     X509_STORE **st;
 444     if (cctx->ctx)
 445         cert = cctx->ctx->cert;
 446     else if (cctx->ssl)
 447         cert = cctx->ssl->cert;
 448     else
 449         return 1;
 450     st = verify_store ? &cert->verify_store : &cert->chain_store;
 451     if (*st == NULL) {
 452         *st = X509_STORE_new();
 453         if (*st == NULL)
 454             return 0;
 455     }
 456     return X509_STORE_load_locations(*st, CAfile, CApath) > 0;
 457 }
 458
 459 static int cmd_ChainCAPath(SSL_CONF_CTX *cctx, const char *value)
 460 {
 461     return do_store(cctx, NULL, value, 0);
 462 }
 463
 464 static int cmd_ChainCAFile(SSL_CONF_CTX *cctx, const char *value)
 465 {
 466     return do_store(cctx, value, NULL, 0);
 467 }
 468
 469 static int cmd_VerifyCAPath(SSL_CONF_CTX *cctx, const char *value)
 470 {
 471     return do_store(cctx, NULL, value, 1);
 472 }
 473
 474 static int cmd_VerifyCAFile(SSL_CONF_CTX *cctx, const char *value)
 475 {
 476     return do_store(cctx, value, NULL, 1);
 477 }
 478
 479 static int cmd_RequestCAFile(SSL_CONF_CTX *cctx, const char *value)
 480 {
 481     if (cctx->canames == NULL)
 482         cctx->canames = sk_X509_NAME_new_null();
 483     if (cctx->canames == NULL)
 484         return 0;
 485     return SSL_add_file_cert_subjects_to_stack(cctx->canames, value);
 486 }
 487
 488 static int cmd_ClientCAFile(SSL_CONF_CTX *cctx, const char *value)
 489 {
 490     return cmd_RequestCAFile(cctx, value);
 491 }
 492
 493 static int cmd_RequestCAPath(SSL_CONF_CTX *cctx, const char *value)
 494 {
 495     if (cctx->canames == NULL)
 496         cctx->canames = sk_X509_NAME_new_null();
 497     if (cctx->canames == NULL)
 498         return 0;
 499     return SSL_add_dir_cert_subjects_to_stack(cctx->canames, value);
 500 }
 501
 502 static int cmd_ClientCAPath(SSL_CONF_CTX *cctx, const char *value)
 503 {
 504     return cmd_RequestCAPath(cctx, value);
 505 }
 506
 507 #ifndef OPENSSL_NO_DH
 508 static int cmd_DHParameters(SSL_CONF_CTX *cctx, const char *value)
 509 {
 510     int rv = 0;
 511     DH *dh = NULL;
 512     BIO *in = NULL;
 513     if (cctx->ctx || cctx->ssl) {
 514         in = BIO_new(BIO_s_file());
 515         if (in == NULL)
 516             goto end;
 517         if (BIO_read_filename(in, value) <= 0)
 518             goto end;
 519         dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL);
 520         if (dh == NULL)
 521             goto end;
 522     } else
 523         return 1;
 524     if (cctx->ctx)
 525         rv = SSL_CTX_set_tmp_dh(cctx->ctx, dh);
 526     if (cctx->ssl)
 527         rv = SSL_set_tmp_dh(cctx->ssl, dh);
 528  end:
 529     DH_free(dh);
 530     BIO_free(in);
 531     return rv > 0;
 532 }
 533 #endif
 534
 535 static int cmd_RecordPadding(SSL_CONF_CTX *cctx, const char *value)
 536 {
 537     int rv = 0;
 538     int block_size = atoi(value);
 539
 540     /*
 541      * All we care about is a non-negative value,
 542      * the setters check the range
 543      */
 544     if (block_size >= 0) {
 545         if (cctx->ctx)
 546             rv = SSL_CTX_set_block_padding(cctx->ctx, block_size);
 547         if (cctx->ssl)
 548             rv = SSL_set_block_padding(cctx->ssl, block_size);
 549     }
 550     return rv;
 551 }
 552
 553 typedef struct {
 554     int (*cmd) (SSL_CONF_CTX *cctx, const char *value);
 555     const char *str_file;
 556     const char *str_cmdline;
 557     unsigned short flags;
 558     unsigned short value_type;
 559 } ssl_conf_cmd_tbl;
 560
 561 /* Table of supported parameters */
 562
 563 #define SSL_CONF_CMD(name, cmdopt, flags, type) \
 564         {cmd_##name, #name, cmdopt, flags, type}
 565
 566 #define SSL_CONF_CMD_STRING(name, cmdopt, flags) \
 567         SSL_CONF_CMD(name, cmdopt, flags, SSL_CONF_TYPE_STRING)
 568
 569 #define SSL_CONF_CMD_SWITCH(name, flags) \
 570         {0, NULL, name, flags, SSL_CONF_TYPE_NONE}
 571
 572 /* See apps/apps.h if you change this table. */
 573 static const ssl_conf_cmd_tbl ssl_conf_cmds[] = {
 574     SSL_CONF_CMD_SWITCH("no_ssl3", 0),
 575     SSL_CONF_CMD_SWITCH("no_tls1", 0),
 576     SSL_CONF_CMD_SWITCH("no_tls1_1", 0),
 577     SSL_CONF_CMD_SWITCH("no_tls1_2", 0),
 578     SSL_CONF_CMD_SWITCH("no_tls1_3", 0),
 579     SSL_CONF_CMD_SWITCH("bugs", 0),
 580     SSL_CONF_CMD_SWITCH("no_comp", 0),
 581     SSL_CONF_CMD_SWITCH("comp", 0),
 582     SSL_CONF_CMD_SWITCH("ecdh_single", SSL_CONF_FLAG_SERVER),
 583     SSL_CONF_CMD_SWITCH("no_ticket", 0),
 584     SSL_CONF_CMD_SWITCH("serverpref", SSL_CONF_FLAG_SERVER),
 585     SSL_CONF_CMD_SWITCH("legacy_renegotiation", 0),
 586     SSL_CONF_CMD_SWITCH("legacy_server_connect", SSL_CONF_FLAG_SERVER),
 587     SSL_CONF_CMD_SWITCH("no_renegotiation", 0),
 588     SSL_CONF_CMD_SWITCH("no_resumption_on_reneg", SSL_CONF_FLAG_SERVER),
 589     SSL_CONF_CMD_SWITCH("no_legacy_server_connect", SSL_CONF_FLAG_SERVER),
 590     SSL_CONF_CMD_SWITCH("allow_no_dhe_kex", 0),
 591     SSL_CONF_CMD_SWITCH("strict", 0),
 592     SSL_CONF_CMD_STRING(SignatureAlgorithms, "sigalgs", 0),
 593     SSL_CONF_CMD_STRING(ClientSignatureAlgorithms, "client_sigalgs", 0),
 594     SSL_CONF_CMD_STRING(Curves, "curves", 0),
 595     SSL_CONF_CMD_STRING(Groups, "groups", 0),
 596 #ifndef OPENSSL_NO_EC
 597     SSL_CONF_CMD_STRING(ECDHParameters, "named_curve", SSL_CONF_FLAG_SERVER),
 598 #endif
 599     SSL_CONF_CMD_STRING(CipherString, "cipher", 0),
 600     SSL_CONF_CMD_STRING(Protocol, NULL, 0),
 601     SSL_CONF_CMD_STRING(MinProtocol, "min_protocol", 0),
 602     SSL_CONF_CMD_STRING(MaxProtocol, "max_protocol", 0),
 603     SSL_CONF_CMD_STRING(Options, NULL, 0),
 604     SSL_CONF_CMD_STRING(VerifyMode, NULL, 0),
 605     SSL_CONF_CMD(Certificate, "cert", SSL_CONF_FLAG_CERTIFICATE,
 606                  SSL_CONF_TYPE_FILE),
 607     SSL_CONF_CMD(PrivateKey, "key", SSL_CONF_FLAG_CERTIFICATE,
 608                  SSL_CONF_TYPE_FILE),
 609     SSL_CONF_CMD(ServerInfoFile, NULL,
 610                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 611                  SSL_CONF_TYPE_FILE),
 612     SSL_CONF_CMD(ChainCAPath, "chainCApath", SSL_CONF_FLAG_CERTIFICATE,
 613                  SSL_CONF_TYPE_DIR),
 614     SSL_CONF_CMD(ChainCAFile, "chainCAfile", SSL_CONF_FLAG_CERTIFICATE,
 615                  SSL_CONF_TYPE_FILE),
 616     SSL_CONF_CMD(VerifyCAPath, "verifyCApath", SSL_CONF_FLAG_CERTIFICATE,
 617                  SSL_CONF_TYPE_DIR),
 618     SSL_CONF_CMD(VerifyCAFile, "verifyCAfile", SSL_CONF_FLAG_CERTIFICATE,
 619                  SSL_CONF_TYPE_FILE),
 620     SSL_CONF_CMD(RequestCAFile, "requestCAFile", SSL_CONF_FLAG_CERTIFICATE,
 621                  SSL_CONF_TYPE_FILE),
 622     SSL_CONF_CMD(ClientCAFile, NULL,
 623                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 624                  SSL_CONF_TYPE_FILE),
 625     SSL_CONF_CMD(RequestCAPath, NULL, SSL_CONF_FLAG_CERTIFICATE,
 626                  SSL_CONF_TYPE_DIR),
 627     SSL_CONF_CMD(ClientCAPath, NULL,
 628                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 629                  SSL_CONF_TYPE_DIR),
 630 #ifndef OPENSSL_NO_DH
 631     SSL_CONF_CMD(DHParameters, "dhparam",
 632                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 633                  SSL_CONF_TYPE_FILE),
 634 #endif
 635     SSL_CONF_CMD_STRING(RecordPadding, "record_padding", 0)
 636 };
 637
 638 /* Supported switches: must match order of switches in ssl_conf_cmds */
 639 static const ssl_switch_tbl ssl_cmd_switches[] = {
 640     {SSL_OP_NO_SSLv3, 0},       /* no_ssl3 */
 641     {SSL_OP_NO_TLSv1, 0},       /* no_tls1 */
 642     {SSL_OP_NO_TLSv1_1, 0},     /* no_tls1_1 */
 643     {SSL_OP_NO_TLSv1_2, 0},     /* no_tls1_2 */
 644     {SSL_OP_NO_TLSv1_3, 0},     /* no_tls1_3 */
 645     {SSL_OP_ALL, 0},            /* bugs */
 646     {SSL_OP_NO_COMPRESSION, 0}, /* no_comp */
 647     {SSL_OP_NO_COMPRESSION, SSL_TFLAG_INV}, /* comp */
 648     {SSL_OP_SINGLE_ECDH_USE, 0}, /* ecdh_single */
 649     {SSL_OP_NO_TICKET, 0},      /* no_ticket */
 650     {SSL_OP_CIPHER_SERVER_PREFERENCE, 0}, /* serverpref */
 651     /* legacy_renegotiation */
 652     {SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION, 0},
 653     /* legacy_server_connect */
 654     {SSL_OP_LEGACY_SERVER_CONNECT, 0},
 655     /* no_renegotiation */
 656     {SSL_OP_NO_RENEGOTIATION, 0},
 657     /* no_resumption_on_reneg */
 658     {SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION, 0},
 659     /* no_legacy_server_connect */
 660     {SSL_OP_LEGACY_SERVER_CONNECT, SSL_TFLAG_INV},
 661     /* allow_no_dhe_kex */
 662     {SSL_OP_ALLOW_NO_DHE_KEX, 0},
 663     {SSL_CERT_FLAG_TLS_STRICT, SSL_TFLAG_CERT}, /* strict */
 664 };
 665
 666 static int ssl_conf_cmd_skip_prefix(SSL_CONF_CTX *cctx, const char **pcmd)
 667 {
 668     if (!pcmd || !*pcmd)
 669         return 0;
 670     /* If a prefix is set, check and skip */
 671     if (cctx->prefix) {
 672         if (strlen(*pcmd) <= cctx->prefixlen)
 673             return 0;
 674         if (cctx->flags & SSL_CONF_FLAG_CMDLINE &&
 675             strncmp(*pcmd, cctx->prefix, cctx->prefixlen))
 676             return 0;
 677         if (cctx->flags & SSL_CONF_FLAG_FILE &&
 678             strncasecmp(*pcmd, cctx->prefix, cctx->prefixlen))
 679             return 0;
 680         *pcmd += cctx->prefixlen;
 681     } else if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
 682         if (**pcmd != '-' || !(*pcmd)[1])
 683             return 0;
 684         *pcmd += 1;
 685     }
 686     return 1;
 687 }
 688
 689 /* Determine if a command is allowed according to cctx flags */
 690 static int ssl_conf_cmd_allowed(SSL_CONF_CTX *cctx, const ssl_conf_cmd_tbl * t)
 691 {
 692     unsigned int tfl = t->flags;
 693     unsigned int cfl = cctx->flags;
 694     if ((tfl & SSL_CONF_FLAG_SERVER) && !(cfl & SSL_CONF_FLAG_SERVER))
 695         return 0;
 696     if ((tfl & SSL_CONF_FLAG_CLIENT) && !(cfl & SSL_CONF_FLAG_CLIENT))
 697         return 0;
 698     if ((tfl & SSL_CONF_FLAG_CERTIFICATE)
 699         && !(cfl & SSL_CONF_FLAG_CERTIFICATE))
 700         return 0;
 701     return 1;
 702 }
 703
 704 static const ssl_conf_cmd_tbl *ssl_conf_cmd_lookup(SSL_CONF_CTX *cctx,
 705                                                    const char *cmd)
 706 {
 707     const ssl_conf_cmd_tbl *t;
 708     size_t i;
 709     if (cmd == NULL)
 710         return NULL;
 711
 712     /* Look for matching parameter name in table */
 713     for (i = 0, t = ssl_conf_cmds; i < OSSL_NELEM(ssl_conf_cmds); i++, t++) {
 714         if (ssl_conf_cmd_allowed(cctx, t)) {
 715             if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
 716                 if (t->str_cmdline && strcmp(t->str_cmdline, cmd) == 0)
 717                     return t;
 718             }
 719             if (cctx->flags & SSL_CONF_FLAG_FILE) {
 720                 if (t->str_file && strcasecmp(t->str_file, cmd) == 0)
 721                     return t;
 722             }
 723         }
 724     }
 725     return NULL;
 726 }
 727
 728 static int ctrl_switch_option(SSL_CONF_CTX *cctx, const ssl_conf_cmd_tbl * cmd)
 729 {
 730     /* Find index of command in table */
 731     size_t idx = cmd - ssl_conf_cmds;
 732     const ssl_switch_tbl *scmd;
 733     /* Sanity check index */
 734     if (idx >= OSSL_NELEM(ssl_cmd_switches))
 735         return 0;
 736     /* Obtain switches entry with same index */
 737     scmd = ssl_cmd_switches + idx;
 738     ssl_set_option(cctx, scmd->name_flags, scmd->option_value, 1);
 739     return 1;
 740 }
 741
 742 int SSL_CONF_cmd(SSL_CONF_CTX *cctx, const char *cmd, const char *value)
 743 {
 744     const ssl_conf_cmd_tbl *runcmd;
 745     if (cmd == NULL) {
 746         SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_INVALID_NULL_CMD_NAME);
 747         return 0;
 748     }
 749
 750     if (!ssl_conf_cmd_skip_prefix(cctx, &cmd))
 751         return -2;
 752
 753     runcmd = ssl_conf_cmd_lookup(cctx, cmd);
 754
 755     if (runcmd) {
 756         int rv;
 757         if (runcmd->value_type == SSL_CONF_TYPE_NONE) {
 758             return ctrl_switch_option(cctx, runcmd);
 759         }
 760         if (value == NULL)
 761             return -3;
 762         rv = runcmd->cmd(cctx, value);
 763         if (rv > 0)
 764             return 2;
 765         if (rv == -2)
 766             return -2;
 767         if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS) {
 768             SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_BAD_VALUE);
 769             ERR_add_error_data(4, "cmd=", cmd, ", value=", value);
 770         }
 771         return 0;
 772     }
 773
 774     if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS) {
 775         SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_UNKNOWN_CMD_NAME);
 776         ERR_add_error_data(2, "cmd=", cmd);
 777     }
 778
 779     return -2;
 780 }
 781
 782 int SSL_CONF_cmd_argv(SSL_CONF_CTX *cctx, int *pargc, char ***pargv)
 783 {
 784     int rv;
 785     const char *arg = NULL, *argn;
 786     if (pargc && *pargc == 0)
 787         return 0;
 788     if (!pargc || *pargc > 0)
 789         arg = **pargv;
 790     if (arg == NULL)
 791         return 0;
 792     if (!pargc || *pargc > 1)
 793         argn = (*pargv)[1];
 794     else
 795         argn = NULL;
 796     cctx->flags &= ~SSL_CONF_FLAG_FILE;
 797     cctx->flags |= SSL_CONF_FLAG_CMDLINE;
 798     rv = SSL_CONF_cmd(cctx, arg, argn);
 799     if (rv > 0) {
 800         /* Success: update pargc, pargv */
 801         (*pargv) += rv;
 802         if (pargc)
 803             (*pargc) -= rv;
 804         return rv;
 805     }
 806     /* Unknown switch: indicate no arguments processed */
 807     if (rv == -2)
 808         return 0;
 809     /* Some error occurred processing command, return fatal error */
 810     if (rv == 0)
 811         return -1;
 812     return rv;
 813 }
 814
 815 int SSL_CONF_cmd_value_type(SSL_CONF_CTX *cctx, const char *cmd)
 816 {
 817     if (ssl_conf_cmd_skip_prefix(cctx, &cmd)) {
 818         const ssl_conf_cmd_tbl *runcmd;
 819         runcmd = ssl_conf_cmd_lookup(cctx, cmd);
 820         if (runcmd)
 821             return runcmd->value_type;
 822     }
 823     return SSL_CONF_TYPE_UNKNOWN;
 824 }
 825
 826 SSL_CONF_CTX *SSL_CONF_CTX_new(void)
 827 {
 828     SSL_CONF_CTX *ret = OPENSSL_zalloc(sizeof(*ret));
 829
 830     return ret;
 831 }
 832
 833 int SSL_CONF_CTX_finish(SSL_CONF_CTX *cctx)
 834 {
 835     /* See if any certificates are missing private keys */
 836     size_t i;
 837     CERT *c = NULL;
 838     if (cctx->ctx)
 839         c = cctx->ctx->cert;
 840     else if (cctx->ssl)
 841         c = cctx->ssl->cert;
 842     if (c && cctx->flags & SSL_CONF_FLAG_REQUIRE_PRIVATE) {
 843         for (i = 0; i < SSL_PKEY_NUM; i++) {
 844             const char *p = cctx->cert_filename[i];
 845             /*
 846              * If missing private key try to load one from certificate file
 847              */
 848             if (p && !c->pkeys[i].privatekey) {
 849                 if (!cmd_PrivateKey(cctx, p))
 850                     return 0;
 851             }
 852         }
 853     }
 854     if (cctx->canames) {
 855         if (cctx->ssl)
 856             SSL_set0_CA_list(cctx->ssl, cctx->canames);
 857         else if (cctx->ctx)
 858             SSL_CTX_set0_CA_list(cctx->ctx, cctx->canames);
 859         else
 860             sk_X509_NAME_pop_free(cctx->canames, X509_NAME_free);
 861         cctx->canames = NULL;
 862     }
 863     return 1;
 864 }
 865
 866 void SSL_CONF_CTX_free(SSL_CONF_CTX *cctx)
 867 {
 868     if (cctx) {
 869         size_t i;
 870         for (i = 0; i < SSL_PKEY_NUM; i++)
 871             OPENSSL_free(cctx->cert_filename[i]);
 872         OPENSSL_free(cctx->prefix);
 873         sk_X509_NAME_pop_free(cctx->canames, X509_NAME_free);
 874         OPENSSL_free(cctx);
 875     }
 876 }
 877
 878 unsigned int SSL_CONF_CTX_set_flags(SSL_CONF_CTX *cctx, unsigned int flags)
 879 {
 880     cctx->flags |= flags;
 881     return cctx->flags;
 882 }
 883
 884 unsigned int SSL_CONF_CTX_clear_flags(SSL_CONF_CTX *cctx, unsigned int flags)
 885 {
 886     cctx->flags &= ~flags;
 887     return cctx->flags;
 888 }
 889
 890 int SSL_CONF_CTX_set1_prefix(SSL_CONF_CTX *cctx, const char *pre)
 891 {
 892     char *tmp = NULL;
 893     if (pre) {
 894         tmp = OPENSSL_strdup(pre);
 895         if (tmp == NULL)
 896             return 0;
 897     }
 898     OPENSSL_free(cctx->prefix);
 899     cctx->prefix = tmp;
 900     if (tmp)
 901         cctx->prefixlen = strlen(tmp);
 902     else
 903         cctx->prefixlen = 0;
 904     return 1;
 905 }
 906
 907 void SSL_CONF_CTX_set_ssl(SSL_CONF_CTX *cctx, SSL *ssl)
 908 {
 909     cctx->ssl = ssl;
 910     cctx->ctx = NULL;
 911     if (ssl) {
 912         cctx->poptions = &ssl->options;
 913         cctx->min_version = &ssl->min_proto_version;
 914         cctx->max_version = &ssl->max_proto_version;
 915         cctx->pcert_flags = &ssl->cert->cert_flags;
 916         cctx->pvfy_flags = &ssl->verify_mode;
 917     } else {
 918         cctx->poptions = NULL;
 919         cctx->min_version = NULL;
 920         cctx->max_version = NULL;
 921         cctx->pcert_flags = NULL;
 922         cctx->pvfy_flags = NULL;
 923     }
 924 }
 925
 926 void SSL_CONF_CTX_set_ssl_ctx(SSL_CONF_CTX *cctx, SSL_CTX *ctx)
 927 {
 928     cctx->ctx = ctx;
 929     cctx->ssl = NULL;
 930     if (ctx) {
 931         cctx->poptions = &ctx->options;
 932         cctx->min_version = &ctx->min_proto_version;
 933         cctx->max_version = &ctx->max_proto_version;
 934         cctx->pcert_flags = &ctx->cert->cert_flags;
 935         cctx->pvfy_flags = &ctx->verify_mode;
 936     } else {
 937         cctx->poptions = NULL;
 938         cctx->min_version = NULL;
 939         cctx->max_version = NULL;
 940         cctx->pcert_flags = NULL;
 941         cctx->pvfy_flags = NULL;
 942     }
 943 }