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 /*
  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     int nid;
 229
 230     /* Ignore values supported by 1.0.2 for the automatic selection */
 231     if ((cctx->flags & SSL_CONF_FLAG_FILE)
 232             && (strcasecmp(value, "+automatic") == 0
 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
 245     if (cctx->ctx)
 246         rv = SSL_CTX_set1_groups(cctx->ctx, &nid, 1);
 247     else if (cctx->ssl)
 248         rv = SSL_set1_groups(cctx->ssl, &nid, 1);
 249
 250     return rv > 0;
 251 }
 252 #endif
 253 static int cmd_CipherString(SSL_CONF_CTX *cctx, const char *value)
 254 {
 255     int rv = 1;
 256
 257     if (cctx->ctx)
 258         rv = SSL_CTX_set_cipher_list(cctx->ctx, value);
 259     if (cctx->ssl)
 260         rv = SSL_set_cipher_list(cctx->ssl, value);
 261     return rv > 0;
 262 }
 263
 264 static int cmd_Ciphersuites(SSL_CONF_CTX *cctx, const char *value)
 265 {
 266     int rv = 1;
 267
 268     if (cctx->ctx)
 269         rv = SSL_CTX_set_ciphersuites(cctx->ctx, value);
 270     if (cctx->ssl)
 271         rv = SSL_set_ciphersuites(cctx->ssl, value);
 272     return rv > 0;
 273 }
 274
 275 static int cmd_Protocol(SSL_CONF_CTX *cctx, const char *value)
 276 {
 277     static const ssl_flag_tbl ssl_protocol_list[] = {
 278         SSL_FLAG_TBL_INV("ALL", SSL_OP_NO_SSL_MASK),
 279         SSL_FLAG_TBL_INV("SSLv2", SSL_OP_NO_SSLv2),
 280         SSL_FLAG_TBL_INV("SSLv3", SSL_OP_NO_SSLv3),
 281         SSL_FLAG_TBL_INV("TLSv1", SSL_OP_NO_TLSv1),
 282         SSL_FLAG_TBL_INV("TLSv1.1", SSL_OP_NO_TLSv1_1),
 283         SSL_FLAG_TBL_INV("TLSv1.2", SSL_OP_NO_TLSv1_2),
 284         SSL_FLAG_TBL_INV("TLSv1.3", SSL_OP_NO_TLSv1_3),
 285         SSL_FLAG_TBL_INV("DTLSv1", SSL_OP_NO_DTLSv1),
 286         SSL_FLAG_TBL_INV("DTLSv1.2", SSL_OP_NO_DTLSv1_2)
 287     };
 288     cctx->tbl = ssl_protocol_list;
 289     cctx->ntbl = OSSL_NELEM(ssl_protocol_list);
 290     return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
 291 }
 292
 293 /*
 294  * protocol_from_string - converts a protocol version string to a number
 295  *
 296  * Returns -1 on failure or the version on success
 297  */
 298 static int protocol_from_string(const char *value)
 299 {
 300     struct protocol_versions {
 301         const char *name;
 302         int version;
 303     };
 304     /*
 305      * Note: To avoid breaking previously valid configurations, we must retain
 306      * legacy entries in this table even if the underlying protocol is no
 307      * longer supported.  This also means that the constants SSL3_VERSION, ...
 308      * need to be retained indefinitely.  This table can only grow, never
 309      * shrink.
 310      */
 311     static const struct protocol_versions versions[] = {
 312         {"None", 0},
 313         {"SSLv3", SSL3_VERSION},
 314         {"TLSv1", TLS1_VERSION},
 315         {"TLSv1.1", TLS1_1_VERSION},
 316         {"TLSv1.2", TLS1_2_VERSION},
 317         {"TLSv1.3", TLS1_3_VERSION},
 318         {"DTLSv1", DTLS1_VERSION},
 319         {"DTLSv1.2", DTLS1_2_VERSION}
 320     };
 321     size_t i;
 322     size_t n = OSSL_NELEM(versions);
 323
 324     for (i = 0; i < n; i++)
 325         if (strcmp(versions[i].name, value) == 0)
 326             return versions[i].version;
 327     return -1;
 328 }
 329
 330 static int min_max_proto(SSL_CONF_CTX *cctx, const char *value, int *bound)
 331 {
 332     int method_version;
 333     int new_version;
 334
 335     if (cctx->ctx != NULL)
 336         method_version = cctx->ctx->method->version;
 337     else if (cctx->ssl != NULL)
 338         method_version = cctx->ssl->ctx->method->version;
 339     else
 340         return 0;
 341     if ((new_version = protocol_from_string(value)) < 0)
 342         return 0;
 343     return ssl_set_version_bound(method_version, new_version, bound);
 344 }
 345
 346 /*
 347  * cmd_MinProtocol - Set min protocol version
 348  * @cctx: config structure to save settings in
 349  * @value: The min protocol version in string form
 350  *
 351  * Returns 1 on success and 0 on failure.
 352  */
 353 static int cmd_MinProtocol(SSL_CONF_CTX *cctx, const char *value)
 354 {
 355     return min_max_proto(cctx, value, cctx->min_version);
 356 }
 357
 358 /*
 359  * cmd_MaxProtocol - Set max protocol version
 360  * @cctx: config structure to save settings in
 361  * @value: The max protocol version in string form
 362  *
 363  * Returns 1 on success and 0 on failure.
 364  */
 365 static int cmd_MaxProtocol(SSL_CONF_CTX *cctx, const char *value)
 366 {
 367     return min_max_proto(cctx, value, cctx->max_version);
 368 }
 369
 370 static int cmd_Options(SSL_CONF_CTX *cctx, const char *value)
 371 {
 372     static const ssl_flag_tbl ssl_option_list[] = {
 373         SSL_FLAG_TBL_INV("SessionTicket", SSL_OP_NO_TICKET),
 374         SSL_FLAG_TBL_INV("EmptyFragments",
 375                          SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS),
 376         SSL_FLAG_TBL("Bugs", SSL_OP_ALL),
 377         SSL_FLAG_TBL_INV("Compression", SSL_OP_NO_COMPRESSION),
 378         SSL_FLAG_TBL_SRV("ServerPreference", SSL_OP_CIPHER_SERVER_PREFERENCE),
 379         SSL_FLAG_TBL_SRV("NoResumptionOnRenegotiation",
 380                          SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION),
 381         SSL_FLAG_TBL_SRV("DHSingle", SSL_OP_SINGLE_DH_USE),
 382         SSL_FLAG_TBL_SRV("ECDHSingle", SSL_OP_SINGLE_ECDH_USE),
 383         SSL_FLAG_TBL("UnsafeLegacyRenegotiation",
 384                      SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION),
 385         SSL_FLAG_TBL_INV("EncryptThenMac", SSL_OP_NO_ENCRYPT_THEN_MAC),
 386         SSL_FLAG_TBL("NoRenegotiation", SSL_OP_NO_RENEGOTIATION),
 387         SSL_FLAG_TBL("AllowNoDHEKEX", SSL_OP_ALLOW_NO_DHE_KEX),
 388         SSL_FLAG_TBL("PrioritizeChaCha", SSL_OP_PRIORITIZE_CHACHA),
 389         SSL_FLAG_TBL("MiddleboxCompat", SSL_OP_ENABLE_MIDDLEBOX_COMPAT),
 390         SSL_FLAG_TBL_INV("AntiReplay", SSL_OP_NO_ANTI_REPLAY),
 391         SSL_FLAG_TBL_INV("ExtendedMasterSecret", SSL_OP_NO_EXTENDED_MASTER_SECRET),
 392         SSL_FLAG_TBL_INV("CANames", SSL_OP_DISABLE_TLSEXT_CA_NAMES)
 393     };
 394     if (value == NULL)
 395         return -3;
 396     cctx->tbl = ssl_option_list;
 397     cctx->ntbl = OSSL_NELEM(ssl_option_list);
 398     return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
 399 }
 400
 401 static int cmd_VerifyMode(SSL_CONF_CTX *cctx, const char *value)
 402 {
 403     static const ssl_flag_tbl ssl_vfy_list[] = {
 404         SSL_FLAG_VFY_CLI("Peer", SSL_VERIFY_PEER),
 405         SSL_FLAG_VFY_SRV("Request", SSL_VERIFY_PEER),
 406         SSL_FLAG_VFY_SRV("Require",
 407                          SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT),
 408         SSL_FLAG_VFY_SRV("Once", SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE),
 409         SSL_FLAG_VFY_SRV("RequestPostHandshake",
 410                          SSL_VERIFY_PEER | SSL_VERIFY_POST_HANDSHAKE),
 411         SSL_FLAG_VFY_SRV("RequirePostHandshake",
 412                          SSL_VERIFY_PEER | SSL_VERIFY_POST_HANDSHAKE |
 413                          SSL_VERIFY_FAIL_IF_NO_PEER_CERT),
 414     };
 415     if (value == NULL)
 416         return -3;
 417     cctx->tbl = ssl_vfy_list;
 418     cctx->ntbl = OSSL_NELEM(ssl_vfy_list);
 419     return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
 420 }
 421
 422 static int cmd_Certificate(SSL_CONF_CTX *cctx, const char *value)
 423 {
 424     int rv = 1;
 425     CERT *c = NULL;
 426     if (cctx->ctx) {
 427         rv = SSL_CTX_use_certificate_chain_file(cctx->ctx, value);
 428         c = cctx->ctx->cert;
 429     }
 430     if (cctx->ssl) {
 431         rv = SSL_use_certificate_chain_file(cctx->ssl, value);
 432         c = cctx->ssl->cert;
 433     }
 434     if (rv > 0 && c && cctx->flags & SSL_CONF_FLAG_REQUIRE_PRIVATE) {
 435         char **pfilename = &cctx->cert_filename[c->key - c->pkeys];
 436         OPENSSL_free(*pfilename);
 437         *pfilename = OPENSSL_strdup(value);
 438         if (*pfilename == NULL)
 439             rv = 0;
 440     }
 441
 442     return rv > 0;
 443 }
 444
 445 static int cmd_PrivateKey(SSL_CONF_CTX *cctx, const char *value)
 446 {
 447     int rv = 1;
 448     if (!(cctx->flags & SSL_CONF_FLAG_CERTIFICATE))
 449         return -2;
 450     if (cctx->ctx)
 451         rv = SSL_CTX_use_PrivateKey_file(cctx->ctx, value, SSL_FILETYPE_PEM);
 452     if (cctx->ssl)
 453         rv = SSL_use_PrivateKey_file(cctx->ssl, value, SSL_FILETYPE_PEM);
 454     return rv > 0;
 455 }
 456
 457 static int cmd_ServerInfoFile(SSL_CONF_CTX *cctx, const char *value)
 458 {
 459     int rv = 1;
 460     if (cctx->ctx)
 461         rv = SSL_CTX_use_serverinfo_file(cctx->ctx, value);
 462     return rv > 0;
 463 }
 464
 465 static int do_store(SSL_CONF_CTX *cctx,
 466                     const char *CAfile, const char *CApath, const char *CAstore,
 467                     int verify_store)
 468 {
 469     CERT *cert;
 470     X509_STORE **st;
 471     SSL_CTX *ctx;
 472     OSSL_LIB_CTX *libctx = NULL;
 473     const char *propq = NULL;
 474
 475     if (cctx->ctx != NULL) {
 476         cert = cctx->ctx->cert;
 477         ctx = cctx->ctx;
 478     } else if (cctx->ssl != NULL) {
 479         cert = cctx->ssl->cert;
 480         ctx = cctx->ssl->ctx;
 481     } else {
 482         return 1;
 483     }
 484     if (ctx != NULL) {
 485         libctx = ctx->libctx;
 486         propq = ctx->propq;
 487     }
 488     st = verify_store ? &cert->verify_store : &cert->chain_store;
 489     if (*st == NULL) {
 490         *st = X509_STORE_new();
 491         if (*st == NULL)
 492             return 0;
 493     }
 494
 495     if (CAfile != NULL && !X509_STORE_load_file_ex(*st, CAfile, libctx, propq))
 496         return 0;
 497     if (CApath != NULL && !X509_STORE_load_path(*st, CApath))
 498         return 0;
 499     if (CAstore != NULL && !X509_STORE_load_store_ex(*st, CAstore, libctx,
 500                                                      propq))
 501         return 0;
 502     return 1;
 503 }
 504
 505 static int cmd_ChainCAPath(SSL_CONF_CTX *cctx, const char *value)
 506 {
 507     return do_store(cctx, NULL, value, NULL, 0);
 508 }
 509
 510 static int cmd_ChainCAFile(SSL_CONF_CTX *cctx, const char *value)
 511 {
 512     return do_store(cctx, value, NULL, NULL, 0);
 513 }
 514
 515 static int cmd_ChainCAStore(SSL_CONF_CTX *cctx, const char *value)
 516 {
 517     return do_store(cctx, NULL, NULL, value, 0);
 518 }
 519
 520 static int cmd_VerifyCAPath(SSL_CONF_CTX *cctx, const char *value)
 521 {
 522     return do_store(cctx, NULL, value, NULL, 1);
 523 }
 524
 525 static int cmd_VerifyCAFile(SSL_CONF_CTX *cctx, const char *value)
 526 {
 527     return do_store(cctx, value, NULL, NULL, 1);
 528 }
 529
 530 static int cmd_VerifyCAStore(SSL_CONF_CTX *cctx, const char *value)
 531 {
 532     return do_store(cctx, NULL, NULL, value, 1);
 533 }
 534
 535 static int cmd_RequestCAFile(SSL_CONF_CTX *cctx, const char *value)
 536 {
 537     if (cctx->canames == NULL)
 538         cctx->canames = sk_X509_NAME_new_null();
 539     if (cctx->canames == NULL)
 540         return 0;
 541     return SSL_add_file_cert_subjects_to_stack(cctx->canames, value);
 542 }
 543
 544 static int cmd_ClientCAFile(SSL_CONF_CTX *cctx, const char *value)
 545 {
 546     return cmd_RequestCAFile(cctx, value);
 547 }
 548
 549 static int cmd_RequestCAPath(SSL_CONF_CTX *cctx, const char *value)
 550 {
 551     if (cctx->canames == NULL)
 552         cctx->canames = sk_X509_NAME_new_null();
 553     if (cctx->canames == NULL)
 554         return 0;
 555     return SSL_add_dir_cert_subjects_to_stack(cctx->canames, value);
 556 }
 557
 558 static int cmd_ClientCAPath(SSL_CONF_CTX *cctx, const char *value)
 559 {
 560     return cmd_RequestCAPath(cctx, value);
 561 }
 562
 563 static int cmd_RequestCAStore(SSL_CONF_CTX *cctx, const char *value)
 564 {
 565     if (cctx->canames == NULL)
 566         cctx->canames = sk_X509_NAME_new_null();
 567     if (cctx->canames == NULL)
 568         return 0;
 569     return SSL_add_store_cert_subjects_to_stack(cctx->canames, value);
 570 }
 571
 572 static int cmd_ClientCAStore(SSL_CONF_CTX *cctx, const char *value)
 573 {
 574     return cmd_RequestCAStore(cctx, value);
 575 }
 576
 577 #ifndef OPENSSL_NO_DH
 578 static int cmd_DHParameters(SSL_CONF_CTX *cctx, const char *value)
 579 {
 580     int rv = 0;
 581     DH *dh = NULL;
 582     BIO *in = NULL;
 583     if (cctx->ctx || cctx->ssl) {
 584         in = BIO_new(BIO_s_file());
 585         if (in == NULL)
 586             goto end;
 587         if (BIO_read_filename(in, value) <= 0)
 588             goto end;
 589         dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL);
 590         if (dh == NULL)
 591             goto end;
 592     } else
 593         return 1;
 594     if (cctx->ctx)
 595         rv = SSL_CTX_set_tmp_dh(cctx->ctx, dh);
 596     if (cctx->ssl)
 597         rv = SSL_set_tmp_dh(cctx->ssl, dh);
 598  end:
 599     DH_free(dh);
 600     BIO_free(in);
 601     return rv > 0;
 602 }
 603 #endif
 604
 605 static int cmd_RecordPadding(SSL_CONF_CTX *cctx, const char *value)
 606 {
 607     int rv = 0;
 608     int block_size = atoi(value);
 609
 610     /*
 611      * All we care about is a non-negative value,
 612      * the setters check the range
 613      */
 614     if (block_size >= 0) {
 615         if (cctx->ctx)
 616             rv = SSL_CTX_set_block_padding(cctx->ctx, block_size);
 617         if (cctx->ssl)
 618             rv = SSL_set_block_padding(cctx->ssl, block_size);
 619     }
 620     return rv;
 621 }
 622
 623
 624 static int cmd_NumTickets(SSL_CONF_CTX *cctx, const char *value)
 625 {
 626     int rv = 0;
 627     int num_tickets = atoi(value);
 628
 629     if (num_tickets >= 0) {
 630         if (cctx->ctx)
 631             rv = SSL_CTX_set_num_tickets(cctx->ctx, num_tickets);
 632         if (cctx->ssl)
 633             rv = SSL_set_num_tickets(cctx->ssl, num_tickets);
 634     }
 635     return rv;
 636 }
 637
 638 typedef struct {
 639     int (*cmd) (SSL_CONF_CTX *cctx, const char *value);
 640     const char *str_file;
 641     const char *str_cmdline;
 642     unsigned short flags;
 643     unsigned short value_type;
 644 } ssl_conf_cmd_tbl;
 645
 646 /* Table of supported parameters */
 647
 648 #define SSL_CONF_CMD(name, cmdopt, flags, type) \
 649         {cmd_##name, #name, cmdopt, flags, type}
 650
 651 #define SSL_CONF_CMD_STRING(name, cmdopt, flags) \
 652         SSL_CONF_CMD(name, cmdopt, flags, SSL_CONF_TYPE_STRING)
 653
 654 #define SSL_CONF_CMD_SWITCH(name, flags) \
 655         {0, NULL, name, flags, SSL_CONF_TYPE_NONE}
 656
 657 /* See apps/apps.h if you change this table. */
 658 static const ssl_conf_cmd_tbl ssl_conf_cmds[] = {
 659     SSL_CONF_CMD_SWITCH("no_ssl3", 0),
 660     SSL_CONF_CMD_SWITCH("no_tls1", 0),
 661     SSL_CONF_CMD_SWITCH("no_tls1_1", 0),
 662     SSL_CONF_CMD_SWITCH("no_tls1_2", 0),
 663     SSL_CONF_CMD_SWITCH("no_tls1_3", 0),
 664     SSL_CONF_CMD_SWITCH("bugs", 0),
 665     SSL_CONF_CMD_SWITCH("no_comp", 0),
 666     SSL_CONF_CMD_SWITCH("comp", 0),
 667     SSL_CONF_CMD_SWITCH("ecdh_single", SSL_CONF_FLAG_SERVER),
 668     SSL_CONF_CMD_SWITCH("no_ticket", 0),
 669     SSL_CONF_CMD_SWITCH("serverpref", SSL_CONF_FLAG_SERVER),
 670     SSL_CONF_CMD_SWITCH("legacy_renegotiation", 0),
 671     SSL_CONF_CMD_SWITCH("legacy_server_connect", SSL_CONF_FLAG_SERVER),
 672     SSL_CONF_CMD_SWITCH("no_renegotiation", 0),
 673     SSL_CONF_CMD_SWITCH("no_resumption_on_reneg", SSL_CONF_FLAG_SERVER),
 674     SSL_CONF_CMD_SWITCH("no_legacy_server_connect", SSL_CONF_FLAG_SERVER),
 675     SSL_CONF_CMD_SWITCH("allow_no_dhe_kex", 0),
 676     SSL_CONF_CMD_SWITCH("prioritize_chacha", SSL_CONF_FLAG_SERVER),
 677     SSL_CONF_CMD_SWITCH("strict", 0),
 678     SSL_CONF_CMD_SWITCH("no_middlebox", 0),
 679     SSL_CONF_CMD_SWITCH("anti_replay", SSL_CONF_FLAG_SERVER),
 680     SSL_CONF_CMD_SWITCH("no_anti_replay", SSL_CONF_FLAG_SERVER),
 681     SSL_CONF_CMD_STRING(SignatureAlgorithms, "sigalgs", 0),
 682     SSL_CONF_CMD_STRING(ClientSignatureAlgorithms, "client_sigalgs", 0),
 683     SSL_CONF_CMD_STRING(Curves, "curves", 0),
 684     SSL_CONF_CMD_STRING(Groups, "groups", 0),
 685 #ifndef OPENSSL_NO_EC
 686     SSL_CONF_CMD_STRING(ECDHParameters, "named_curve", SSL_CONF_FLAG_SERVER),
 687 #endif
 688     SSL_CONF_CMD_STRING(CipherString, "cipher", 0),
 689     SSL_CONF_CMD_STRING(Ciphersuites, "ciphersuites", 0),
 690     SSL_CONF_CMD_STRING(Protocol, NULL, 0),
 691     SSL_CONF_CMD_STRING(MinProtocol, "min_protocol", 0),
 692     SSL_CONF_CMD_STRING(MaxProtocol, "max_protocol", 0),
 693     SSL_CONF_CMD_STRING(Options, NULL, 0),
 694     SSL_CONF_CMD_STRING(VerifyMode, NULL, 0),
 695     SSL_CONF_CMD(Certificate, "cert", SSL_CONF_FLAG_CERTIFICATE,
 696                  SSL_CONF_TYPE_FILE),
 697     SSL_CONF_CMD(PrivateKey, "key", SSL_CONF_FLAG_CERTIFICATE,
 698                  SSL_CONF_TYPE_FILE),
 699     SSL_CONF_CMD(ServerInfoFile, NULL,
 700                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 701                  SSL_CONF_TYPE_FILE),
 702     SSL_CONF_CMD(ChainCAPath, "chainCApath", SSL_CONF_FLAG_CERTIFICATE,
 703                  SSL_CONF_TYPE_DIR),
 704     SSL_CONF_CMD(ChainCAFile, "chainCAfile", SSL_CONF_FLAG_CERTIFICATE,
 705                  SSL_CONF_TYPE_FILE),
 706     SSL_CONF_CMD(ChainCAStore, "chainCAstore", SSL_CONF_FLAG_CERTIFICATE,
 707                  SSL_CONF_TYPE_STORE),
 708     SSL_CONF_CMD(VerifyCAPath, "verifyCApath", SSL_CONF_FLAG_CERTIFICATE,
 709                  SSL_CONF_TYPE_DIR),
 710     SSL_CONF_CMD(VerifyCAFile, "verifyCAfile", SSL_CONF_FLAG_CERTIFICATE,
 711                  SSL_CONF_TYPE_FILE),
 712     SSL_CONF_CMD(VerifyCAStore, "verifyCAstore", SSL_CONF_FLAG_CERTIFICATE,
 713                  SSL_CONF_TYPE_STORE),
 714     SSL_CONF_CMD(RequestCAFile, "requestCAFile", SSL_CONF_FLAG_CERTIFICATE,
 715                  SSL_CONF_TYPE_FILE),
 716     SSL_CONF_CMD(ClientCAFile, NULL,
 717                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 718                  SSL_CONF_TYPE_FILE),
 719     SSL_CONF_CMD(RequestCAPath, NULL, SSL_CONF_FLAG_CERTIFICATE,
 720                  SSL_CONF_TYPE_DIR),
 721     SSL_CONF_CMD(ClientCAPath, NULL,
 722                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 723                  SSL_CONF_TYPE_DIR),
 724     SSL_CONF_CMD(RequestCAStore, "requestCAStore", SSL_CONF_FLAG_CERTIFICATE,
 725                  SSL_CONF_TYPE_STORE),
 726     SSL_CONF_CMD(ClientCAStore, NULL,
 727                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 728                  SSL_CONF_TYPE_STORE),
 729 #ifndef OPENSSL_NO_DH
 730     SSL_CONF_CMD(DHParameters, "dhparam",
 731                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 732                  SSL_CONF_TYPE_FILE),
 733 #endif
 734     SSL_CONF_CMD_STRING(RecordPadding, "record_padding", 0),
 735     SSL_CONF_CMD_STRING(NumTickets, "num_tickets", SSL_CONF_FLAG_SERVER),
 736 };
 737
 738 /* Supported switches: must match order of switches in ssl_conf_cmds */
 739 static const ssl_switch_tbl ssl_cmd_switches[] = {
 740     {SSL_OP_NO_SSLv3, 0},       /* no_ssl3 */
 741     {SSL_OP_NO_TLSv1, 0},       /* no_tls1 */
 742     {SSL_OP_NO_TLSv1_1, 0},     /* no_tls1_1 */
 743     {SSL_OP_NO_TLSv1_2, 0},     /* no_tls1_2 */
 744     {SSL_OP_NO_TLSv1_3, 0},     /* no_tls1_3 */
 745     {SSL_OP_ALL, 0},            /* bugs */
 746     {SSL_OP_NO_COMPRESSION, 0}, /* no_comp */
 747     {SSL_OP_NO_COMPRESSION, SSL_TFLAG_INV}, /* comp */
 748     {SSL_OP_SINGLE_ECDH_USE, 0}, /* ecdh_single */
 749     {SSL_OP_NO_TICKET, 0},      /* no_ticket */
 750     {SSL_OP_CIPHER_SERVER_PREFERENCE, 0}, /* serverpref */
 751     /* legacy_renegotiation */
 752     {SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION, 0},
 753     /* legacy_server_connect */
 754     {SSL_OP_LEGACY_SERVER_CONNECT, 0},
 755     /* no_renegotiation */
 756     {SSL_OP_NO_RENEGOTIATION, 0},
 757     /* no_resumption_on_reneg */
 758     {SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION, 0},
 759     /* no_legacy_server_connect */
 760     {SSL_OP_LEGACY_SERVER_CONNECT, SSL_TFLAG_INV},
 761     /* allow_no_dhe_kex */
 762     {SSL_OP_ALLOW_NO_DHE_KEX, 0},
 763     /* chacha reprioritization */
 764     {SSL_OP_PRIORITIZE_CHACHA, 0},
 765     {SSL_CERT_FLAG_TLS_STRICT, SSL_TFLAG_CERT}, /* strict */
 766     /* no_middlebox */
 767     {SSL_OP_ENABLE_MIDDLEBOX_COMPAT, SSL_TFLAG_INV},
 768     /* anti_replay */
 769     {SSL_OP_NO_ANTI_REPLAY, SSL_TFLAG_INV},
 770     /* no_anti_replay */
 771     {SSL_OP_NO_ANTI_REPLAY, 0},
 772 };
 773
 774 static int ssl_conf_cmd_skip_prefix(SSL_CONF_CTX *cctx, const char **pcmd)
 775 {
 776     if (pcmd == NULL || *pcmd == NULL)
 777         return 0;
 778     /* If a prefix is set, check and skip */
 779     if (cctx->prefix) {
 780         if (strlen(*pcmd) <= cctx->prefixlen)
 781             return 0;
 782         if (cctx->flags & SSL_CONF_FLAG_CMDLINE &&
 783             strncmp(*pcmd, cctx->prefix, cctx->prefixlen))
 784             return 0;
 785         if (cctx->flags & SSL_CONF_FLAG_FILE &&
 786             strncasecmp(*pcmd, cctx->prefix, cctx->prefixlen))
 787             return 0;
 788         *pcmd += cctx->prefixlen;
 789     } else if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
 790         if (**pcmd != '-' || !(*pcmd)[1])
 791             return 0;
 792         *pcmd += 1;
 793     }
 794     return 1;
 795 }
 796
 797 /* Determine if a command is allowed according to cctx flags */
 798 static int ssl_conf_cmd_allowed(SSL_CONF_CTX *cctx, const ssl_conf_cmd_tbl * t)
 799 {
 800     unsigned int tfl = t->flags;
 801     unsigned int cfl = cctx->flags;
 802     if ((tfl & SSL_CONF_FLAG_SERVER) && !(cfl & SSL_CONF_FLAG_SERVER))
 803         return 0;
 804     if ((tfl & SSL_CONF_FLAG_CLIENT) && !(cfl & SSL_CONF_FLAG_CLIENT))
 805         return 0;
 806     if ((tfl & SSL_CONF_FLAG_CERTIFICATE)
 807         && !(cfl & SSL_CONF_FLAG_CERTIFICATE))
 808         return 0;
 809     return 1;
 810 }
 811
 812 static const ssl_conf_cmd_tbl *ssl_conf_cmd_lookup(SSL_CONF_CTX *cctx,
 813                                                    const char *cmd)
 814 {
 815     const ssl_conf_cmd_tbl *t;
 816     size_t i;
 817     if (cmd == NULL)
 818         return NULL;
 819
 820     /* Look for matching parameter name in table */
 821     for (i = 0, t = ssl_conf_cmds; i < OSSL_NELEM(ssl_conf_cmds); i++, t++) {
 822         if (ssl_conf_cmd_allowed(cctx, t)) {
 823             if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
 824                 if (t->str_cmdline && strcmp(t->str_cmdline, cmd) == 0)
 825                     return t;
 826             }
 827             if (cctx->flags & SSL_CONF_FLAG_FILE) {
 828                 if (t->str_file && strcasecmp(t->str_file, cmd) == 0)
 829                     return t;
 830             }
 831         }
 832     }
 833     return NULL;
 834 }
 835
 836 static int ctrl_switch_option(SSL_CONF_CTX *cctx, const ssl_conf_cmd_tbl * cmd)
 837 {
 838     /* Find index of command in table */
 839     size_t idx = cmd - ssl_conf_cmds;
 840     const ssl_switch_tbl *scmd;
 841     /* Sanity check index */
 842     if (idx >= OSSL_NELEM(ssl_cmd_switches))
 843         return 0;
 844     /* Obtain switches entry with same index */
 845     scmd = ssl_cmd_switches + idx;
 846     ssl_set_option(cctx, scmd->name_flags, scmd->option_value, 1);
 847     return 1;
 848 }
 849
 850 int SSL_CONF_cmd(SSL_CONF_CTX *cctx, const char *cmd, const char *value)
 851 {
 852     const ssl_conf_cmd_tbl *runcmd;
 853     if (cmd == NULL) {
 854         ERR_raise(ERR_LIB_SSL, SSL_R_INVALID_NULL_CMD_NAME);
 855         return 0;
 856     }
 857
 858     if (!ssl_conf_cmd_skip_prefix(cctx, &cmd))
 859         return -2;
 860
 861     runcmd = ssl_conf_cmd_lookup(cctx, cmd);
 862
 863     if (runcmd) {
 864         int rv;
 865         if (runcmd->value_type == SSL_CONF_TYPE_NONE) {
 866             return ctrl_switch_option(cctx, runcmd);
 867         }
 868         if (value == NULL)
 869             return -3;
 870         rv = runcmd->cmd(cctx, value);
 871         if (rv > 0)
 872             return 2;
 873         if (rv == -2)
 874             return -2;
 875         if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS)
 876             ERR_raise_data(ERR_LIB_SSL, SSL_R_BAD_VALUE,
 877                            "cmd=%s, value=%s", cmd, value);
 878         return 0;
 879     }
 880
 881     if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS)
 882         ERR_raise_data(ERR_LIB_SSL, SSL_R_UNKNOWN_CMD_NAME, "cmd=%s", cmd);
 883
 884     return -2;
 885 }
 886
 887 int SSL_CONF_cmd_argv(SSL_CONF_CTX *cctx, int *pargc, char ***pargv)
 888 {
 889     int rv;
 890     const char *arg = NULL, *argn;
 891
 892     if (pargc != NULL && *pargc == 0)
 893         return 0;
 894     if (pargc == NULL || *pargc > 0)
 895         arg = **pargv;
 896     if (arg == NULL)
 897         return 0;
 898     if (pargc == NULL || *pargc > 1)
 899         argn = (*pargv)[1];
 900     else
 901         argn = NULL;
 902     cctx->flags &= ~SSL_CONF_FLAG_FILE;
 903     cctx->flags |= SSL_CONF_FLAG_CMDLINE;
 904     rv = SSL_CONF_cmd(cctx, arg, argn);
 905     if (rv > 0) {
 906         /* Success: update pargc, pargv */
 907         (*pargv) += rv;
 908         if (pargc)
 909             (*pargc) -= rv;
 910         return rv;
 911     }
 912     /* Unknown switch: indicate no arguments processed */
 913     if (rv == -2)
 914         return 0;
 915     /* Some error occurred processing command, return fatal error */
 916     if (rv == 0)
 917         return -1;
 918     return rv;
 919 }
 920
 921 int SSL_CONF_cmd_value_type(SSL_CONF_CTX *cctx, const char *cmd)
 922 {
 923     if (ssl_conf_cmd_skip_prefix(cctx, &cmd)) {
 924         const ssl_conf_cmd_tbl *runcmd;
 925         runcmd = ssl_conf_cmd_lookup(cctx, cmd);
 926         if (runcmd)
 927             return runcmd->value_type;
 928     }
 929     return SSL_CONF_TYPE_UNKNOWN;
 930 }
 931
 932 SSL_CONF_CTX *SSL_CONF_CTX_new(void)
 933 {
 934     SSL_CONF_CTX *ret = OPENSSL_zalloc(sizeof(*ret));
 935
 936     return ret;
 937 }
 938
 939 int SSL_CONF_CTX_finish(SSL_CONF_CTX *cctx)
 940 {
 941     /* See if any certificates are missing private keys */
 942     size_t i;
 943     CERT *c = NULL;
 944     if (cctx->ctx)
 945         c = cctx->ctx->cert;
 946     else if (cctx->ssl)
 947         c = cctx->ssl->cert;
 948     if (c && cctx->flags & SSL_CONF_FLAG_REQUIRE_PRIVATE) {
 949         for (i = 0; i < SSL_PKEY_NUM; i++) {
 950             const char *p = cctx->cert_filename[i];
 951             /*
 952              * If missing private key try to load one from certificate file
 953              */
 954             if (p && !c->pkeys[i].privatekey) {
 955                 if (!cmd_PrivateKey(cctx, p))
 956                     return 0;
 957             }
 958         }
 959     }
 960     if (cctx->canames) {
 961         if (cctx->ssl)
 962             SSL_set0_CA_list(cctx->ssl, cctx->canames);
 963         else if (cctx->ctx)
 964             SSL_CTX_set0_CA_list(cctx->ctx, cctx->canames);
 965         else
 966             sk_X509_NAME_pop_free(cctx->canames, X509_NAME_free);
 967         cctx->canames = NULL;
 968     }
 969     return 1;
 970 }
 971
 972 void SSL_CONF_CTX_free(SSL_CONF_CTX *cctx)
 973 {
 974     if (cctx) {
 975         size_t i;
 976         for (i = 0; i < SSL_PKEY_NUM; i++)
 977             OPENSSL_free(cctx->cert_filename[i]);
 978         OPENSSL_free(cctx->prefix);
 979         sk_X509_NAME_pop_free(cctx->canames, X509_NAME_free);
 980         OPENSSL_free(cctx);
 981     }
 982 }
 983
 984 unsigned int SSL_CONF_CTX_set_flags(SSL_CONF_CTX *cctx, unsigned int flags)
 985 {
 986     cctx->flags |= flags;
 987     return cctx->flags;
 988 }
 989
 990 unsigned int SSL_CONF_CTX_clear_flags(SSL_CONF_CTX *cctx, unsigned int flags)
 991 {
 992     cctx->flags &= ~flags;
 993     return cctx->flags;
 994 }
 995
 996 int SSL_CONF_CTX_set1_prefix(SSL_CONF_CTX *cctx, const char *pre)
 997 {
 998     char *tmp = NULL;
 999     if (pre) {
1000         tmp = OPENSSL_strdup(pre);
1001         if (tmp == NULL)
1002             return 0;
1003     }
1004     OPENSSL_free(cctx->prefix);
1005     cctx->prefix = tmp;
1006     if (tmp)
1007         cctx->prefixlen = strlen(tmp);
1008     else
1009         cctx->prefixlen = 0;
1010     return 1;
1011 }
1012
1013 void SSL_CONF_CTX_set_ssl(SSL_CONF_CTX *cctx, SSL *ssl)
1014 {
1015     cctx->ssl = ssl;
1016     cctx->ctx = NULL;
1017     if (ssl) {
1018         cctx->poptions = &ssl->options;
1019         cctx->min_version = &ssl->min_proto_version;
1020         cctx->max_version = &ssl->max_proto_version;
1021         cctx->pcert_flags = &ssl->cert->cert_flags;
1022         cctx->pvfy_flags = &ssl->verify_mode;
1023     } else {
1024         cctx->poptions = NULL;
1025         cctx->min_version = NULL;
1026         cctx->max_version = NULL;
1027         cctx->pcert_flags = NULL;
1028         cctx->pvfy_flags = NULL;
1029     }
1030 }
1031
1032 void SSL_CONF_CTX_set_ssl_ctx(SSL_CONF_CTX *cctx, SSL_CTX *ctx)
1033 {
1034     cctx->ctx = ctx;
1035     cctx->ssl = NULL;
1036     if (ctx) {
1037         cctx->poptions = &ctx->options;
1038         cctx->min_version = &ctx->min_proto_version;
1039         cctx->max_version = &ctx->max_proto_version;
1040         cctx->pcert_flags = &ctx->cert->cert_flags;
1041         cctx->pvfy_flags = &ctx->verify_mode;
1042     } else {
1043         cctx->poptions = NULL;
1044         cctx->min_version = NULL;
1045         cctx->max_version = NULL;
1046         cctx->pcert_flags = NULL;
1047         cctx->pvfy_flags = NULL;
1048     }
1049 }