ssl/ssl_conf.c

   1 /*
   2  * Copyright 2012-2016 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
  16 /*
  17  * structure holding name tables. This is used for permitted elements in lists
  18  * such as TLSv1.
  19  */
  20
  21 typedef struct {
  22     const char *name;
  23     int namelen;
  24     unsigned int name_flags;
  25     unsigned long option_value;
  26 } ssl_flag_tbl;
  27
  28 /* Switch table: use for single command line switches like no_tls2 */
  29 typedef struct {
  30     unsigned long option_value;
  31     unsigned int name_flags;
  32 } ssl_switch_tbl;
  33
  34 /* Sense of name is inverted e.g. "TLSv1" will clear SSL_OP_NO_TLSv1 */
  35 #define SSL_TFLAG_INV   0x1
  36 /* Mask for type of flag referred to */
  37 #define SSL_TFLAG_TYPE_MASK 0xf00
  38 /* Flag is for options */
  39 #define SSL_TFLAG_OPTION    0x000
  40 /* Flag is for cert_flags */
  41 #define SSL_TFLAG_CERT      0x100
  42 /* Flag is for verify mode */
  43 #define SSL_TFLAG_VFY       0x200
  44 /* Option can only be used for clients */
  45 #define SSL_TFLAG_CLIENT SSL_CONF_FLAG_CLIENT
  46 /* Option can only be used for servers */
  47 #define SSL_TFLAG_SERVER SSL_CONF_FLAG_SERVER
  48 #define SSL_TFLAG_BOTH (SSL_TFLAG_CLIENT|SSL_TFLAG_SERVER)
  49
  50 #define SSL_FLAG_TBL(str, flag) \
  51         {str, (int)(sizeof(str) - 1), SSL_TFLAG_BOTH, flag}
  52 #define SSL_FLAG_TBL_SRV(str, flag) \
  53         {str, (int)(sizeof(str) - 1), SSL_TFLAG_SERVER, flag}
  54 #define SSL_FLAG_TBL_CLI(str, flag) \
  55         {str, (int)(sizeof(str) - 1), SSL_TFLAG_CLIENT, flag}
  56 #define SSL_FLAG_TBL_INV(str, flag) \
  57         {str, (int)(sizeof(str) - 1), SSL_TFLAG_INV|SSL_TFLAG_BOTH, flag}
  58 #define SSL_FLAG_TBL_SRV_INV(str, flag) \
  59         {str, (int)(sizeof(str) - 1), SSL_TFLAG_INV|SSL_TFLAG_SERVER, flag}
  60 #define SSL_FLAG_TBL_CERT(str, flag) \
  61         {str, (int)(sizeof(str) - 1), SSL_TFLAG_CERT|SSL_TFLAG_BOTH, flag}
  62
  63 #define SSL_FLAG_VFY_CLI(str, flag) \
  64         {str, (int)(sizeof(str) - 1), SSL_TFLAG_VFY | SSL_TFLAG_CLIENT, flag}
  65 #define SSL_FLAG_VFY_SRV(str, flag) \
  66         {str, (int)(sizeof(str) - 1), SSL_TFLAG_VFY | SSL_TFLAG_SERVER, flag}
  67
  68 /*
  69  * Opaque structure containing SSL configuration context.
  70  */
  71
  72 struct ssl_conf_ctx_st {
  73     /*
  74      * Various flags indicating (among other things) which options we will
  75      * recognise.
  76      */
  77     unsigned int flags;
  78     /* Prefix and length of commands */
  79     char *prefix;
  80     size_t prefixlen;
  81     /* SSL_CTX or SSL structure to perform operations on */
  82     SSL_CTX *ctx;
  83     SSL *ssl;
  84     /* Pointer to SSL or SSL_CTX options field or NULL if none */
  85     uint32_t *poptions;
  86     /* Certificate filenames for each type */
  87     char *cert_filename[SSL_PKEY_NUM];
  88     /* Pointer to SSL or SSL_CTX cert_flags or NULL if none */
  89     uint32_t *pcert_flags;
  90     /* Pointer to SSL or SSL_CTX verify_mode or NULL if none */
  91     uint32_t *pvfy_flags;
  92     /* Pointer to SSL or SSL_CTX min_version field or NULL if none */
  93     int *min_version;
  94     /* Pointer to SSL or SSL_CTX max_version field or NULL if none */
  95     int *max_version;
  96     /* Current flag table being worked on */
  97     const ssl_flag_tbl *tbl;
  98     /* Size of table */
  99     size_t ntbl;
 100     /* Client CA names */
 101     STACK_OF(X509_NAME) *canames;
 102 };
 103
 104 static void ssl_set_option(SSL_CONF_CTX *cctx, unsigned int name_flags,
 105                            unsigned long option_value, int onoff)
 106 {
 107     uint32_t *pflags;
 108     if (cctx->poptions == NULL)
 109         return;
 110     if (name_flags & SSL_TFLAG_INV)
 111         onoff ^= 1;
 112     switch (name_flags & SSL_TFLAG_TYPE_MASK) {
 113
 114     case SSL_TFLAG_CERT:
 115         pflags = cctx->pcert_flags;
 116         break;
 117
 118     case SSL_TFLAG_VFY:
 119         pflags = cctx->pvfy_flags;
 120         break;
 121
 122     case SSL_TFLAG_OPTION:
 123         pflags = cctx->poptions;
 124         break;
 125
 126     default:
 127         return;
 128
 129     }
 130     if (onoff)
 131         *pflags |= option_value;
 132     else
 133         *pflags &= ~option_value;
 134 }
 135
 136 static int ssl_match_option(SSL_CONF_CTX *cctx, const ssl_flag_tbl *tbl,
 137                             const char *name, int namelen, int onoff)
 138 {
 139     /* If name not relevant for context skip */
 140     if (!(cctx->flags & tbl->name_flags & SSL_TFLAG_BOTH))
 141         return 0;
 142     if (namelen == -1) {
 143         if (strcmp(tbl->name, name))
 144             return 0;
 145     } else if (tbl->namelen != namelen || strncasecmp(tbl->name, name, namelen))
 146         return 0;
 147     ssl_set_option(cctx, tbl->name_flags, tbl->option_value, onoff);
 148     return 1;
 149 }
 150
 151 static int ssl_set_option_list(const char *elem, int len, void *usr)
 152 {
 153     SSL_CONF_CTX *cctx = usr;
 154     size_t i;
 155     const ssl_flag_tbl *tbl;
 156     int onoff = 1;
 157     /*
 158      * len == -1 indicates not being called in list context, just for single
 159      * command line switches, so don't allow +, -.
 160      */
 161     if (elem == NULL)
 162         return 0;
 163     if (len != -1) {
 164         if (*elem == '+') {
 165             elem++;
 166             len--;
 167             onoff = 1;
 168         } else if (*elem == '-') {
 169             elem++;
 170             len--;
 171             onoff = 0;
 172         }
 173     }
 174     for (i = 0, tbl = cctx->tbl; i < cctx->ntbl; i++, tbl++) {
 175         if (ssl_match_option(cctx, tbl, elem, len, onoff))
 176             return 1;
 177     }
 178     return 0;
 179 }
 180
 181 /* Set supported signature algorithms */
 182 static int cmd_SignatureAlgorithms(SSL_CONF_CTX *cctx, const char *value)
 183 {
 184     int rv;
 185     if (cctx->ssl)
 186         rv = SSL_set1_sigalgs_list(cctx->ssl, value);
 187     /* NB: ctx == NULL performs syntax checking only */
 188     else
 189         rv = SSL_CTX_set1_sigalgs_list(cctx->ctx, value);
 190     return rv > 0;
 191 }
 192
 193 /* Set supported client signature algorithms */
 194 static int cmd_ClientSignatureAlgorithms(SSL_CONF_CTX *cctx, const char *value)
 195 {
 196     int rv;
 197     if (cctx->ssl)
 198         rv = SSL_set1_client_sigalgs_list(cctx->ssl, value);
 199     /* NB: ctx == NULL performs syntax checking only */
 200     else
 201         rv = SSL_CTX_set1_client_sigalgs_list(cctx->ctx, value);
 202     return rv > 0;
 203 }
 204
 205 static int cmd_Groups(SSL_CONF_CTX *cctx, const char *value)
 206 {
 207     int rv;
 208     if (cctx->ssl)
 209         rv = SSL_set1_groups_list(cctx->ssl, value);
 210     /* NB: ctx == NULL performs syntax checking only */
 211     else
 212         rv = SSL_CTX_set1_groups_list(cctx->ctx, value);
 213     return rv > 0;
 214 }
 215
 216 /* This is the old name for cmd_Groups - retained for backwards compatibility */
 217 static int cmd_Curves(SSL_CONF_CTX *cctx, const char *value)
 218 {
 219     return cmd_Groups(cctx, value);
 220 }
 221
 222 #ifndef OPENSSL_NO_EC
 223 /* ECDH temporary parameters */
 224 static int cmd_ECDHParameters(SSL_CONF_CTX *cctx, const char *value)
 225 {
 226     int rv = 1;
 227     EC_KEY *ecdh;
 228     int nid;
 229
 230     nid = EC_curve_nist2nid(value);
 231     if (nid == NID_undef)
 232         nid = OBJ_sn2nid(value);
 233     if (nid == 0)
 234         return 0;
 235     ecdh = EC_KEY_new_by_curve_name(nid);
 236     if (!ecdh)
 237         return 0;
 238     if (cctx->ctx)
 239         rv = SSL_CTX_set_tmp_ecdh(cctx->ctx, ecdh);
 240     else if (cctx->ssl)
 241         rv = SSL_set_tmp_ecdh(cctx->ssl, ecdh);
 242     EC_KEY_free(ecdh);
 243
 244     return rv > 0;
 245 }
 246 #endif
 247 static int cmd_CipherString(SSL_CONF_CTX *cctx, const char *value)
 248 {
 249     int rv = 1;
 250     if (cctx->ctx)
 251         rv = SSL_CTX_set_cipher_list(cctx->ctx, value);
 252     if (cctx->ssl)
 253         rv = SSL_set_cipher_list(cctx->ssl, value);
 254     return rv > 0;
 255 }
 256
 257 static int cmd_Protocol(SSL_CONF_CTX *cctx, const char *value)
 258 {
 259     static const ssl_flag_tbl ssl_protocol_list[] = {
 260         SSL_FLAG_TBL_INV("ALL", SSL_OP_NO_SSL_MASK),
 261         SSL_FLAG_TBL_INV("SSLv2", SSL_OP_NO_SSLv2),
 262         SSL_FLAG_TBL_INV("SSLv3", SSL_OP_NO_SSLv3),
 263         SSL_FLAG_TBL_INV("TLSv1", SSL_OP_NO_TLSv1),
 264         SSL_FLAG_TBL_INV("TLSv1.1", SSL_OP_NO_TLSv1_1),
 265         SSL_FLAG_TBL_INV("TLSv1.2", SSL_OP_NO_TLSv1_2),
 266         SSL_FLAG_TBL_INV("TLSv1.3", SSL_OP_NO_TLSv1_3),
 267         SSL_FLAG_TBL_INV("DTLSv1", SSL_OP_NO_DTLSv1),
 268         SSL_FLAG_TBL_INV("DTLSv1.2", SSL_OP_NO_DTLSv1_2)
 269     };
 270     cctx->tbl = ssl_protocol_list;
 271     cctx->ntbl = OSSL_NELEM(ssl_protocol_list);
 272     return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
 273 }
 274
 275 /*
 276  * protocol_from_string - converts a protocol version string to a number
 277  *
 278  * Returns -1 on failure or the version on success
 279  */
 280 static int protocol_from_string(const char *value)
 281 {
 282     struct protocol_versions {
 283         const char *name;
 284         int version;
 285     };
 286     static const struct protocol_versions versions[] = {
 287         {"None", 0},
 288         {"SSLv3", SSL3_VERSION},
 289         {"TLSv1", TLS1_VERSION},
 290         {"TLSv1.1", TLS1_1_VERSION},
 291         {"TLSv1.2", TLS1_2_VERSION},
 292         {"TLSv1.3", TLS1_3_VERSION},
 293         {"DTLSv1", DTLS1_VERSION},
 294         {"DTLSv1.2", DTLS1_2_VERSION}
 295     };
 296     size_t i;
 297     size_t n = OSSL_NELEM(versions);
 298
 299     for (i = 0; i < n; i++)
 300         if (strcmp(versions[i].name, value) == 0)
 301             return versions[i].version;
 302     return -1;
 303 }
 304
 305 static int min_max_proto(SSL_CONF_CTX *cctx, const char *value, int *bound)
 306 {
 307     int method_version;
 308     int new_version;
 309
 310     if (cctx->ctx != NULL)
 311         method_version = cctx->ctx->method->version;
 312     else if (cctx->ssl != NULL)
 313         method_version = cctx->ssl->ctx->method->version;
 314     else
 315         return 0;
 316     if ((new_version = protocol_from_string(value)) < 0)
 317         return 0;
 318     return ssl_set_version_bound(method_version, new_version, bound);
 319 }
 320
 321 /*
 322  * cmd_MinProtocol - Set min protocol version
 323  * @cctx: config structure to save settings in
 324  * @value: The min protocol version in string form
 325  *
 326  * Returns 1 on success and 0 on failure.
 327  */
 328 static int cmd_MinProtocol(SSL_CONF_CTX *cctx, const char *value)
 329 {
 330     return min_max_proto(cctx, value, cctx->min_version);
 331 }
 332
 333 /*
 334  * cmd_MaxProtocol - Set max protocol version
 335  * @cctx: config structure to save settings in
 336  * @value: The max protocol version in string form
 337  *
 338  * Returns 1 on success and 0 on failure.
 339  */
 340 static int cmd_MaxProtocol(SSL_CONF_CTX *cctx, const char *value)
 341 {
 342     return min_max_proto(cctx, value, cctx->max_version);
 343 }
 344
 345 static int cmd_Options(SSL_CONF_CTX *cctx, const char *value)
 346 {
 347     static const ssl_flag_tbl ssl_option_list[] = {
 348         SSL_FLAG_TBL_INV("SessionTicket", SSL_OP_NO_TICKET),
 349         SSL_FLAG_TBL_INV("EmptyFragments",
 350                          SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS),
 351         SSL_FLAG_TBL("Bugs", SSL_OP_ALL),
 352         SSL_FLAG_TBL_INV("Compression", SSL_OP_NO_COMPRESSION),
 353         SSL_FLAG_TBL_SRV("ServerPreference", SSL_OP_CIPHER_SERVER_PREFERENCE),
 354         SSL_FLAG_TBL_SRV("NoResumptionOnRenegotiation",
 355                          SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION),
 356         SSL_FLAG_TBL_SRV("DHSingle", SSL_OP_SINGLE_DH_USE),
 357         SSL_FLAG_TBL_SRV("ECDHSingle", SSL_OP_SINGLE_ECDH_USE),
 358         SSL_FLAG_TBL("UnsafeLegacyRenegotiation",
 359                      SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION),
 360         SSL_FLAG_TBL_INV("EncryptThenMac", SSL_OP_NO_ENCRYPT_THEN_MAC),
 361     };
 362     if (value == NULL)
 363         return -3;
 364     cctx->tbl = ssl_option_list;
 365     cctx->ntbl = OSSL_NELEM(ssl_option_list);
 366     return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
 367 }
 368
 369 static int cmd_VerifyMode(SSL_CONF_CTX *cctx, const char *value)
 370 {
 371     static const ssl_flag_tbl ssl_vfy_list[] = {
 372         SSL_FLAG_VFY_CLI("Peer", SSL_VERIFY_PEER),
 373         SSL_FLAG_VFY_SRV("Request", SSL_VERIFY_PEER),
 374         SSL_FLAG_VFY_SRV("Require",
 375                          SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT),
 376         SSL_FLAG_VFY_SRV("Once", SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE)
 377     };
 378     if (value == NULL)
 379         return -3;
 380     cctx->tbl = ssl_vfy_list;
 381     cctx->ntbl = OSSL_NELEM(ssl_vfy_list);
 382     return CONF_parse_list(value, ',', 1, ssl_set_option_list, cctx);
 383 }
 384
 385 static int cmd_Certificate(SSL_CONF_CTX *cctx, const char *value)
 386 {
 387     int rv = 1;
 388     CERT *c = NULL;
 389     if (cctx->ctx) {
 390         rv = SSL_CTX_use_certificate_chain_file(cctx->ctx, value);
 391         c = cctx->ctx->cert;
 392     }
 393     if (cctx->ssl) {
 394         rv = SSL_use_certificate_chain_file(cctx->ssl, value);
 395         c = cctx->ssl->cert;
 396     }
 397     if (rv > 0 && c && cctx->flags & SSL_CONF_FLAG_REQUIRE_PRIVATE) {
 398         char **pfilename = &cctx->cert_filename[c->key - c->pkeys];
 399         OPENSSL_free(*pfilename);
 400         *pfilename = OPENSSL_strdup(value);
 401         if (!*pfilename)
 402             rv = 0;
 403     }
 404
 405     return rv > 0;
 406 }
 407
 408 static int cmd_PrivateKey(SSL_CONF_CTX *cctx, const char *value)
 409 {
 410     int rv = 1;
 411     if (!(cctx->flags & SSL_CONF_FLAG_CERTIFICATE))
 412         return -2;
 413     if (cctx->ctx)
 414         rv = SSL_CTX_use_PrivateKey_file(cctx->ctx, value, SSL_FILETYPE_PEM);
 415     if (cctx->ssl)
 416         rv = SSL_use_PrivateKey_file(cctx->ssl, value, SSL_FILETYPE_PEM);
 417     return rv > 0;
 418 }
 419
 420 static int cmd_ServerInfoFile(SSL_CONF_CTX *cctx, const char *value)
 421 {
 422     int rv = 1;
 423     if (cctx->ctx)
 424         rv = SSL_CTX_use_serverinfo_file(cctx->ctx, value);
 425     return rv > 0;
 426 }
 427
 428 static int do_store(SSL_CONF_CTX *cctx,
 429                     const char *CAfile, const char *CApath, int verify_store)
 430 {
 431     CERT *cert;
 432     X509_STORE **st;
 433     if (cctx->ctx)
 434         cert = cctx->ctx->cert;
 435     else if (cctx->ssl)
 436         cert = cctx->ssl->cert;
 437     else
 438         return 1;
 439     st = verify_store ? &cert->verify_store : &cert->chain_store;
 440     if (*st == NULL) {
 441         *st = X509_STORE_new();
 442         if (*st == NULL)
 443             return 0;
 444     }
 445     return X509_STORE_load_locations(*st, CAfile, CApath) > 0;
 446 }
 447
 448 static int cmd_ChainCAPath(SSL_CONF_CTX *cctx, const char *value)
 449 {
 450     return do_store(cctx, NULL, value, 0);
 451 }
 452
 453 static int cmd_ChainCAFile(SSL_CONF_CTX *cctx, const char *value)
 454 {
 455     return do_store(cctx, value, NULL, 0);
 456 }
 457
 458 static int cmd_VerifyCAPath(SSL_CONF_CTX *cctx, const char *value)
 459 {
 460     return do_store(cctx, NULL, value, 1);
 461 }
 462
 463 static int cmd_VerifyCAFile(SSL_CONF_CTX *cctx, const char *value)
 464 {
 465     return do_store(cctx, value, NULL, 1);
 466 }
 467
 468 static int cmd_ClientCAFile(SSL_CONF_CTX *cctx, const char *value)
 469 {
 470     if (cctx->canames == NULL)
 471         cctx->canames = sk_X509_NAME_new_null();
 472     if (cctx->canames == NULL)
 473         return 0;
 474     return SSL_add_file_cert_subjects_to_stack(cctx->canames, value);
 475 }
 476
 477 static int cmd_ClientCAPath(SSL_CONF_CTX *cctx, const char *value)
 478 {
 479     if (cctx->canames == NULL)
 480         cctx->canames = sk_X509_NAME_new_null();
 481     if (cctx->canames == NULL)
 482         return 0;
 483     return SSL_add_dir_cert_subjects_to_stack(cctx->canames, value);
 484 }
 485
 486 #ifndef OPENSSL_NO_DH
 487 static int cmd_DHParameters(SSL_CONF_CTX *cctx, const char *value)
 488 {
 489     int rv = 0;
 490     DH *dh = NULL;
 491     BIO *in = NULL;
 492     if (cctx->ctx || cctx->ssl) {
 493         in = BIO_new(BIO_s_file());
 494         if (in == NULL)
 495             goto end;
 496         if (BIO_read_filename(in, value) <= 0)
 497             goto end;
 498         dh = PEM_read_bio_DHparams(in, NULL, NULL, NULL);
 499         if (dh == NULL)
 500             goto end;
 501     } else
 502         return 1;
 503     if (cctx->ctx)
 504         rv = SSL_CTX_set_tmp_dh(cctx->ctx, dh);
 505     if (cctx->ssl)
 506         rv = SSL_set_tmp_dh(cctx->ssl, dh);
 507  end:
 508     DH_free(dh);
 509     BIO_free(in);
 510     return rv > 0;
 511 }
 512 #endif
 513 typedef struct {
 514     int (*cmd) (SSL_CONF_CTX *cctx, const char *value);
 515     const char *str_file;
 516     const char *str_cmdline;
 517     unsigned short flags;
 518     unsigned short value_type;
 519 } ssl_conf_cmd_tbl;
 520
 521 /* Table of supported parameters */
 522
 523 #define SSL_CONF_CMD(name, cmdopt, flags, type) \
 524         {cmd_##name, #name, cmdopt, flags, type}
 525
 526 #define SSL_CONF_CMD_STRING(name, cmdopt, flags) \
 527         SSL_CONF_CMD(name, cmdopt, flags, SSL_CONF_TYPE_STRING)
 528
 529 #define SSL_CONF_CMD_SWITCH(name, flags) \
 530         {0, NULL, name, flags, SSL_CONF_TYPE_NONE}
 531
 532 /* See apps/apps.h if you change this table. */
 533 static const ssl_conf_cmd_tbl ssl_conf_cmds[] = {
 534     SSL_CONF_CMD_SWITCH("no_ssl3", 0),
 535     SSL_CONF_CMD_SWITCH("no_tls1", 0),
 536     SSL_CONF_CMD_SWITCH("no_tls1_1", 0),
 537     SSL_CONF_CMD_SWITCH("no_tls1_2", 0),
 538     SSL_CONF_CMD_SWITCH("no_tls1_3", 0),
 539     SSL_CONF_CMD_SWITCH("bugs", 0),
 540     SSL_CONF_CMD_SWITCH("no_comp", 0),
 541     SSL_CONF_CMD_SWITCH("comp", 0),
 542     SSL_CONF_CMD_SWITCH("ecdh_single", SSL_CONF_FLAG_SERVER),
 543     SSL_CONF_CMD_SWITCH("no_ticket", 0),
 544     SSL_CONF_CMD_SWITCH("serverpref", SSL_CONF_FLAG_SERVER),
 545     SSL_CONF_CMD_SWITCH("legacy_renegotiation", 0),
 546     SSL_CONF_CMD_SWITCH("legacy_server_connect", SSL_CONF_FLAG_SERVER),
 547     SSL_CONF_CMD_SWITCH("no_resumption_on_reneg", SSL_CONF_FLAG_SERVER),
 548     SSL_CONF_CMD_SWITCH("no_legacy_server_connect", SSL_CONF_FLAG_SERVER),
 549     SSL_CONF_CMD_SWITCH("strict", 0),
 550     SSL_CONF_CMD_STRING(SignatureAlgorithms, "sigalgs", 0),
 551     SSL_CONF_CMD_STRING(ClientSignatureAlgorithms, "client_sigalgs", 0),
 552     SSL_CONF_CMD_STRING(Curves, "curves", 0),
 553     SSL_CONF_CMD_STRING(Groups, "groups", 0),
 554 #ifndef OPENSSL_NO_EC
 555     SSL_CONF_CMD_STRING(ECDHParameters, "named_curve", SSL_CONF_FLAG_SERVER),
 556 #endif
 557     SSL_CONF_CMD_STRING(CipherString, "cipher", 0),
 558     SSL_CONF_CMD_STRING(Protocol, NULL, 0),
 559     SSL_CONF_CMD_STRING(MinProtocol, "min_protocol", 0),
 560     SSL_CONF_CMD_STRING(MaxProtocol, "max_protocol", 0),
 561     SSL_CONF_CMD_STRING(Options, NULL, 0),
 562     SSL_CONF_CMD_STRING(VerifyMode, NULL, 0),
 563     SSL_CONF_CMD(Certificate, "cert", SSL_CONF_FLAG_CERTIFICATE,
 564                  SSL_CONF_TYPE_FILE),
 565     SSL_CONF_CMD(PrivateKey, "key", SSL_CONF_FLAG_CERTIFICATE,
 566                  SSL_CONF_TYPE_FILE),
 567     SSL_CONF_CMD(ServerInfoFile, NULL,
 568                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 569                  SSL_CONF_TYPE_FILE),
 570     SSL_CONF_CMD(ChainCAPath, "chainCApath", SSL_CONF_FLAG_CERTIFICATE,
 571                  SSL_CONF_TYPE_DIR),
 572     SSL_CONF_CMD(ChainCAFile, "chainCAfile", SSL_CONF_FLAG_CERTIFICATE,
 573                  SSL_CONF_TYPE_FILE),
 574     SSL_CONF_CMD(VerifyCAPath, "verifyCApath", SSL_CONF_FLAG_CERTIFICATE,
 575                  SSL_CONF_TYPE_DIR),
 576     SSL_CONF_CMD(VerifyCAFile, "verifyCAfile", SSL_CONF_FLAG_CERTIFICATE,
 577                  SSL_CONF_TYPE_FILE),
 578     SSL_CONF_CMD(ClientCAFile, NULL,
 579                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 580                  SSL_CONF_TYPE_FILE),
 581     SSL_CONF_CMD(ClientCAPath, NULL,
 582                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 583                  SSL_CONF_TYPE_DIR),
 584 #ifndef OPENSSL_NO_DH
 585     SSL_CONF_CMD(DHParameters, "dhparam",
 586                  SSL_CONF_FLAG_SERVER | SSL_CONF_FLAG_CERTIFICATE,
 587                  SSL_CONF_TYPE_FILE)
 588 #endif
 589 };
 590
 591 /* Supported switches: must match order of switches in ssl_conf_cmds */
 592 static const ssl_switch_tbl ssl_cmd_switches[] = {
 593     {SSL_OP_NO_SSLv3, 0},       /* no_ssl3 */
 594     {SSL_OP_NO_TLSv1, 0},       /* no_tls1 */
 595     {SSL_OP_NO_TLSv1_1, 0},     /* no_tls1_1 */
 596     {SSL_OP_NO_TLSv1_2, 0},     /* no_tls1_2 */
 597     {SSL_OP_NO_TLSv1_3, 0},     /* no_tls1_3 */
 598     {SSL_OP_ALL, 0},            /* bugs */
 599     {SSL_OP_NO_COMPRESSION, 0}, /* no_comp */
 600     {SSL_OP_NO_COMPRESSION, SSL_TFLAG_INV}, /* comp */
 601     {SSL_OP_SINGLE_ECDH_USE, 0}, /* ecdh_single */
 602     {SSL_OP_NO_TICKET, 0},      /* no_ticket */
 603     {SSL_OP_CIPHER_SERVER_PREFERENCE, 0}, /* serverpref */
 604     /* legacy_renegotiation */
 605     {SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION, 0},
 606     /* legacy_server_connect */
 607     {SSL_OP_LEGACY_SERVER_CONNECT, 0},
 608     /* no_resumption_on_reneg */
 609     {SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION, 0},
 610     /* no_legacy_server_connect */
 611     {SSL_OP_LEGACY_SERVER_CONNECT, SSL_TFLAG_INV},
 612     {SSL_CERT_FLAG_TLS_STRICT, SSL_TFLAG_CERT}, /* strict */
 613 };
 614
 615 static int ssl_conf_cmd_skip_prefix(SSL_CONF_CTX *cctx, const char **pcmd)
 616 {
 617     if (!pcmd || !*pcmd)
 618         return 0;
 619     /* If a prefix is set, check and skip */
 620     if (cctx->prefix) {
 621         if (strlen(*pcmd) <= cctx->prefixlen)
 622             return 0;
 623         if (cctx->flags & SSL_CONF_FLAG_CMDLINE &&
 624             strncmp(*pcmd, cctx->prefix, cctx->prefixlen))
 625             return 0;
 626         if (cctx->flags & SSL_CONF_FLAG_FILE &&
 627             strncasecmp(*pcmd, cctx->prefix, cctx->prefixlen))
 628             return 0;
 629         *pcmd += cctx->prefixlen;
 630     } else if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
 631         if (**pcmd != '-' || !(*pcmd)[1])
 632             return 0;
 633         *pcmd += 1;
 634     }
 635     return 1;
 636 }
 637
 638 /* Determine if a command is allowed according to cctx flags */
 639 static int ssl_conf_cmd_allowed(SSL_CONF_CTX *cctx, const ssl_conf_cmd_tbl * t)
 640 {
 641     unsigned int tfl = t->flags;
 642     unsigned int cfl = cctx->flags;
 643     if ((tfl & SSL_CONF_FLAG_SERVER) && !(cfl & SSL_CONF_FLAG_SERVER))
 644         return 0;
 645     if ((tfl & SSL_CONF_FLAG_CLIENT) && !(cfl & SSL_CONF_FLAG_CLIENT))
 646         return 0;
 647     if ((tfl & SSL_CONF_FLAG_CERTIFICATE)
 648         && !(cfl & SSL_CONF_FLAG_CERTIFICATE))
 649         return 0;
 650     return 1;
 651 }
 652
 653 static const ssl_conf_cmd_tbl *ssl_conf_cmd_lookup(SSL_CONF_CTX *cctx,
 654                                                    const char *cmd)
 655 {
 656     const ssl_conf_cmd_tbl *t;
 657     size_t i;
 658     if (cmd == NULL)
 659         return NULL;
 660
 661     /* Look for matching parameter name in table */
 662     for (i = 0, t = ssl_conf_cmds; i < OSSL_NELEM(ssl_conf_cmds); i++, t++) {
 663         if (ssl_conf_cmd_allowed(cctx, t)) {
 664             if (cctx->flags & SSL_CONF_FLAG_CMDLINE) {
 665                 if (t->str_cmdline && strcmp(t->str_cmdline, cmd) == 0)
 666                     return t;
 667             }
 668             if (cctx->flags & SSL_CONF_FLAG_FILE) {
 669                 if (t->str_file && strcasecmp(t->str_file, cmd) == 0)
 670                     return t;
 671             }
 672         }
 673     }
 674     return NULL;
 675 }
 676
 677 static int ctrl_switch_option(SSL_CONF_CTX *cctx, const ssl_conf_cmd_tbl * cmd)
 678 {
 679     /* Find index of command in table */
 680     size_t idx = cmd - ssl_conf_cmds;
 681     const ssl_switch_tbl *scmd;
 682     /* Sanity check index */
 683     if (idx >= OSSL_NELEM(ssl_cmd_switches))
 684         return 0;
 685     /* Obtain switches entry with same index */
 686     scmd = ssl_cmd_switches + idx;
 687     ssl_set_option(cctx, scmd->name_flags, scmd->option_value, 1);
 688     return 1;
 689 }
 690
 691 int SSL_CONF_cmd(SSL_CONF_CTX *cctx, const char *cmd, const char *value)
 692 {
 693     const ssl_conf_cmd_tbl *runcmd;
 694     if (cmd == NULL) {
 695         SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_INVALID_NULL_CMD_NAME);
 696         return 0;
 697     }
 698
 699     if (!ssl_conf_cmd_skip_prefix(cctx, &cmd))
 700         return -2;
 701
 702     runcmd = ssl_conf_cmd_lookup(cctx, cmd);
 703
 704     if (runcmd) {
 705         int rv;
 706         if (runcmd->value_type == SSL_CONF_TYPE_NONE) {
 707             return ctrl_switch_option(cctx, runcmd);
 708         }
 709         if (value == NULL)
 710             return -3;
 711         rv = runcmd->cmd(cctx, value);
 712         if (rv > 0)
 713             return 2;
 714         if (rv == -2)
 715             return -2;
 716         if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS) {
 717             SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_BAD_VALUE);
 718             ERR_add_error_data(4, "cmd=", cmd, ", value=", value);
 719         }
 720         return 0;
 721     }
 722
 723     if (cctx->flags & SSL_CONF_FLAG_SHOW_ERRORS) {
 724         SSLerr(SSL_F_SSL_CONF_CMD, SSL_R_UNKNOWN_CMD_NAME);
 725         ERR_add_error_data(2, "cmd=", cmd);
 726     }
 727
 728     return -2;
 729 }
 730
 731 int SSL_CONF_cmd_argv(SSL_CONF_CTX *cctx, int *pargc, char ***pargv)
 732 {
 733     int rv;
 734     const char *arg = NULL, *argn;
 735     if (pargc && *pargc == 0)
 736         return 0;
 737     if (!pargc || *pargc > 0)
 738         arg = **pargv;
 739     if (arg == NULL)
 740         return 0;
 741     if (!pargc || *pargc > 1)
 742         argn = (*pargv)[1];
 743     else
 744         argn = NULL;
 745     cctx->flags &= ~SSL_CONF_FLAG_FILE;
 746     cctx->flags |= SSL_CONF_FLAG_CMDLINE;
 747     rv = SSL_CONF_cmd(cctx, arg, argn);
 748     if (rv > 0) {
 749         /* Success: update pargc, pargv */
 750         (*pargv) += rv;
 751         if (pargc)
 752             (*pargc) -= rv;
 753         return rv;
 754     }
 755     /* Unknown switch: indicate no arguments processed */
 756     if (rv == -2)
 757         return 0;
 758     /* Some error occurred processing command, return fatal error */
 759     if (rv == 0)
 760         return -1;
 761     return rv;
 762 }
 763
 764 int SSL_CONF_cmd_value_type(SSL_CONF_CTX *cctx, const char *cmd)
 765 {
 766     if (ssl_conf_cmd_skip_prefix(cctx, &cmd)) {
 767         const ssl_conf_cmd_tbl *runcmd;
 768         runcmd = ssl_conf_cmd_lookup(cctx, cmd);
 769         if (runcmd)
 770             return runcmd->value_type;
 771     }
 772     return SSL_CONF_TYPE_UNKNOWN;
 773 }
 774
 775 SSL_CONF_CTX *SSL_CONF_CTX_new(void)
 776 {
 777     SSL_CONF_CTX *ret = OPENSSL_zalloc(sizeof(*ret));
 778
 779     return ret;
 780 }
 781
 782 int SSL_CONF_CTX_finish(SSL_CONF_CTX *cctx)
 783 {
 784     /* See if any certificates are missing private keys */
 785     size_t i;
 786     CERT *c = NULL;
 787     if (cctx->ctx)
 788         c = cctx->ctx->cert;
 789     else if (cctx->ssl)
 790         c = cctx->ssl->cert;
 791     if (c && cctx->flags & SSL_CONF_FLAG_REQUIRE_PRIVATE) {
 792         for (i = 0; i < SSL_PKEY_NUM; i++) {
 793             const char *p = cctx->cert_filename[i];
 794             /*
 795              * If missing private key try to load one from certificate file
 796              */
 797             if (p && !c->pkeys[i].privatekey) {
 798                 if (!cmd_PrivateKey(cctx, p))
 799                     return 0;
 800             }
 801         }
 802     }
 803     if (cctx->canames) {
 804         if (cctx->ssl)
 805             SSL_set_client_CA_list(cctx->ssl, cctx->canames);
 806         else if (cctx->ctx)
 807             SSL_CTX_set_client_CA_list(cctx->ctx, cctx->canames);
 808         else
 809             sk_X509_NAME_pop_free(cctx->canames, X509_NAME_free);
 810         cctx->canames = NULL;
 811     }
 812     return 1;
 813 }
 814
 815 void SSL_CONF_CTX_free(SSL_CONF_CTX *cctx)
 816 {
 817     if (cctx) {
 818         size_t i;
 819         for (i = 0; i < SSL_PKEY_NUM; i++)
 820             OPENSSL_free(cctx->cert_filename[i]);
 821         OPENSSL_free(cctx->prefix);
 822         sk_X509_NAME_pop_free(cctx->canames, X509_NAME_free);
 823         OPENSSL_free(cctx);
 824     }
 825 }
 826
 827 unsigned int SSL_CONF_CTX_set_flags(SSL_CONF_CTX *cctx, unsigned int flags)
 828 {
 829     cctx->flags |= flags;
 830     return cctx->flags;
 831 }
 832
 833 unsigned int SSL_CONF_CTX_clear_flags(SSL_CONF_CTX *cctx, unsigned int flags)
 834 {
 835     cctx->flags &= ~flags;
 836     return cctx->flags;
 837 }
 838
 839 int SSL_CONF_CTX_set1_prefix(SSL_CONF_CTX *cctx, const char *pre)
 840 {
 841     char *tmp = NULL;
 842     if (pre) {
 843         tmp = OPENSSL_strdup(pre);
 844         if (tmp == NULL)
 845             return 0;
 846     }
 847     OPENSSL_free(cctx->prefix);
 848     cctx->prefix = tmp;
 849     if (tmp)
 850         cctx->prefixlen = strlen(tmp);
 851     else
 852         cctx->prefixlen = 0;
 853     return 1;
 854 }
 855
 856 void SSL_CONF_CTX_set_ssl(SSL_CONF_CTX *cctx, SSL *ssl)
 857 {
 858     cctx->ssl = ssl;
 859     cctx->ctx = NULL;
 860     if (ssl) {
 861         cctx->poptions = &ssl->options;
 862         cctx->min_version = &ssl->min_proto_version;
 863         cctx->max_version = &ssl->max_proto_version;
 864         cctx->pcert_flags = &ssl->cert->cert_flags;
 865         cctx->pvfy_flags = &ssl->verify_mode;
 866     } else {
 867         cctx->poptions = NULL;
 868         cctx->min_version = NULL;
 869         cctx->max_version = NULL;
 870         cctx->pcert_flags = NULL;
 871         cctx->pvfy_flags = NULL;
 872     }
 873 }
 874
 875 void SSL_CONF_CTX_set_ssl_ctx(SSL_CONF_CTX *cctx, SSL_CTX *ctx)
 876 {
 877     cctx->ctx = ctx;
 878     cctx->ssl = NULL;
 879     if (ctx) {
 880         cctx->poptions = &ctx->options;
 881         cctx->min_version = &ctx->min_proto_version;
 882         cctx->max_version = &ctx->max_proto_version;
 883         cctx->pcert_flags = &ctx->cert->cert_flags;
 884         cctx->pvfy_flags = &ctx->verify_mode;
 885     } else {
 886         cctx->poptions = NULL;
 887         cctx->min_version = NULL;
 888         cctx->max_version = NULL;
 889         cctx->pcert_flags = NULL;
 890         cctx->pvfy_flags = NULL;
 891     }
 892 }