apps/s_cb.c

   1 /*
   2  * Copyright 1995-2016 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 /* callback functions used by s_client, s_server, and s_time */
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <string.h> /* for memcpy() and strcmp() */
  14 #define USE_SOCKETS
  15 #include "apps.h"
  16 #undef USE_SOCKETS
  17 #include <openssl/err.h>
  18 #include <openssl/rand.h>
  19 #include <openssl/x509.h>
  20 #include <openssl/ssl.h>
  21 #include <openssl/bn.h>
  22 #ifndef OPENSSL_NO_DH
  23 # include <openssl/dh.h>
  24 #endif
  25 #include "s_apps.h"
  26
  27 #define COOKIE_SECRET_LENGTH    16
  28
  29 VERIFY_CB_ARGS verify_args = { 0, 0, X509_V_OK, 0 };
  30
  31 #ifndef OPENSSL_NO_SOCK
  32 static unsigned char cookie_secret[COOKIE_SECRET_LENGTH];
  33 static int cookie_initialized = 0;
  34 #endif
  35 static BIO *bio_keylog = NULL;
  36
  37 static const char *lookup(int val, const STRINT_PAIR* list, const char* def)
  38 {
  39     for ( ; list->name; ++list)
  40         if (list->retval == val)
  41             return list->name;
  42     return def;
  43 }
  44
  45 int verify_callback(int ok, X509_STORE_CTX *ctx)
  46 {
  47     X509 *err_cert;
  48     int err, depth;
  49
  50     err_cert = X509_STORE_CTX_get_current_cert(ctx);
  51     err = X509_STORE_CTX_get_error(ctx);
  52     depth = X509_STORE_CTX_get_error_depth(ctx);
  53
  54     if (!verify_args.quiet || !ok) {
  55         BIO_printf(bio_err, "depth=%d ", depth);
  56         if (err_cert) {
  57             X509_NAME_print_ex(bio_err,
  58                                X509_get_subject_name(err_cert),
  59                                0, XN_FLAG_ONELINE);
  60             BIO_puts(bio_err, "\n");
  61         } else
  62             BIO_puts(bio_err, "<no cert>\n");
  63     }
  64     if (!ok) {
  65         BIO_printf(bio_err, "verify error:num=%d:%s\n", err,
  66                    X509_verify_cert_error_string(err));
  67         if (verify_args.depth >= depth) {
  68             if (!verify_args.return_error)
  69                 ok = 1;
  70             verify_args.error = err;
  71         } else {
  72             ok = 0;
  73             verify_args.error = X509_V_ERR_CERT_CHAIN_TOO_LONG;
  74         }
  75     }
  76     switch (err) {
  77     case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
  78         BIO_puts(bio_err, "issuer= ");
  79         X509_NAME_print_ex(bio_err, X509_get_issuer_name(err_cert),
  80                            0, XN_FLAG_ONELINE);
  81         BIO_puts(bio_err, "\n");
  82         break;
  83     case X509_V_ERR_CERT_NOT_YET_VALID:
  84     case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
  85         BIO_printf(bio_err, "notBefore=");
  86         ASN1_TIME_print(bio_err, X509_get0_notBefore(err_cert));
  87         BIO_printf(bio_err, "\n");
  88         break;
  89     case X509_V_ERR_CERT_HAS_EXPIRED:
  90     case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
  91         BIO_printf(bio_err, "notAfter=");
  92         ASN1_TIME_print(bio_err, X509_get0_notAfter(err_cert));
  93         BIO_printf(bio_err, "\n");
  94         break;
  95     case X509_V_ERR_NO_EXPLICIT_POLICY:
  96         if (!verify_args.quiet)
  97             policies_print(ctx);
  98         break;
  99     }
 100     if (err == X509_V_OK && ok == 2 && !verify_args.quiet)
 101         policies_print(ctx);
 102     if (ok && !verify_args.quiet)
 103         BIO_printf(bio_err, "verify return:%d\n", ok);
 104     return (ok);
 105 }
 106
 107 int set_cert_stuff(SSL_CTX *ctx, char *cert_file, char *key_file)
 108 {
 109     if (cert_file != NULL) {
 110         if (SSL_CTX_use_certificate_file(ctx, cert_file,
 111                                          SSL_FILETYPE_PEM) <= 0) {
 112             BIO_printf(bio_err, "unable to get certificate from '%s'\n",
 113                        cert_file);
 114             ERR_print_errors(bio_err);
 115             return (0);
 116         }
 117         if (key_file == NULL)
 118             key_file = cert_file;
 119         if (SSL_CTX_use_PrivateKey_file(ctx, key_file, SSL_FILETYPE_PEM) <= 0) {
 120             BIO_printf(bio_err, "unable to get private key from '%s'\n",
 121                        key_file);
 122             ERR_print_errors(bio_err);
 123             return (0);
 124         }
 125
 126         /*
 127          * If we are using DSA, we can copy the parameters from the private
 128          * key
 129          */
 130
 131         /*
 132          * Now we know that a key and cert have been set against the SSL
 133          * context
 134          */
 135         if (!SSL_CTX_check_private_key(ctx)) {
 136             BIO_printf(bio_err,
 137                        "Private key does not match the certificate public key\n");
 138             return (0);
 139         }
 140     }
 141     return (1);
 142 }
 143
 144 int set_cert_key_stuff(SSL_CTX *ctx, X509 *cert, EVP_PKEY *key,
 145                        STACK_OF(X509) *chain, int build_chain)
 146 {
 147     int chflags = chain ? SSL_BUILD_CHAIN_FLAG_CHECK : 0;
 148     if (cert == NULL)
 149         return 1;
 150     if (SSL_CTX_use_certificate(ctx, cert) <= 0) {
 151         BIO_printf(bio_err, "error setting certificate\n");
 152         ERR_print_errors(bio_err);
 153         return 0;
 154     }
 155
 156     if (SSL_CTX_use_PrivateKey(ctx, key) <= 0) {
 157         BIO_printf(bio_err, "error setting private key\n");
 158         ERR_print_errors(bio_err);
 159         return 0;
 160     }
 161
 162     /*
 163      * Now we know that a key and cert have been set against the SSL context
 164      */
 165     if (!SSL_CTX_check_private_key(ctx)) {
 166         BIO_printf(bio_err,
 167                    "Private key does not match the certificate public key\n");
 168         return 0;
 169     }
 170     if (chain && !SSL_CTX_set1_chain(ctx, chain)) {
 171         BIO_printf(bio_err, "error setting certificate chain\n");
 172         ERR_print_errors(bio_err);
 173         return 0;
 174     }
 175     if (build_chain && !SSL_CTX_build_cert_chain(ctx, chflags)) {
 176         BIO_printf(bio_err, "error building certificate chain\n");
 177         ERR_print_errors(bio_err);
 178         return 0;
 179     }
 180     return 1;
 181 }
 182
 183 static STRINT_PAIR cert_type_list[] = {
 184     {"RSA sign", TLS_CT_RSA_SIGN},
 185     {"DSA sign", TLS_CT_DSS_SIGN},
 186     {"RSA fixed DH", TLS_CT_RSA_FIXED_DH},
 187     {"DSS fixed DH", TLS_CT_DSS_FIXED_DH},
 188     {"ECDSA sign", TLS_CT_ECDSA_SIGN},
 189     {"RSA fixed ECDH", TLS_CT_RSA_FIXED_ECDH},
 190     {"ECDSA fixed ECDH", TLS_CT_ECDSA_FIXED_ECDH},
 191     {"GOST01 Sign", TLS_CT_GOST01_SIGN},
 192     {NULL}
 193 };
 194
 195 static void ssl_print_client_cert_types(BIO *bio, SSL *s)
 196 {
 197     const unsigned char *p;
 198     int i;
 199     int cert_type_num = SSL_get0_certificate_types(s, &p);
 200     if (!cert_type_num)
 201         return;
 202     BIO_puts(bio, "Client Certificate Types: ");
 203     for (i = 0; i < cert_type_num; i++) {
 204         unsigned char cert_type = p[i];
 205         const char *cname = lookup((int)cert_type, cert_type_list, NULL);
 206
 207         if (i)
 208             BIO_puts(bio, ", ");
 209         if (cname)
 210             BIO_puts(bio, cname);
 211         else
 212             BIO_printf(bio, "UNKNOWN (%d),", cert_type);
 213     }
 214     BIO_puts(bio, "\n");
 215 }
 216
 217 static const char *get_sigtype(int nid)
 218 {
 219     switch (nid) {
 220     case EVP_PKEY_RSA:
 221         return "RSA";
 222
 223     case EVP_PKEY_RSA_PSS:
 224         return "RSA-PSS";
 225
 226     case EVP_PKEY_DSA:
 227         return "DSA";
 228
 229      case EVP_PKEY_EC:
 230         return "ECDSA";
 231
 232     default:
 233         return NULL;
 234     }
 235 }
 236
 237 static int do_print_sigalgs(BIO *out, SSL *s, int shared)
 238 {
 239     int i, nsig, client;
 240     client = SSL_is_server(s) ? 0 : 1;
 241     if (shared)
 242         nsig = SSL_get_shared_sigalgs(s, 0, NULL, NULL, NULL, NULL, NULL);
 243     else
 244         nsig = SSL_get_sigalgs(s, -1, NULL, NULL, NULL, NULL, NULL);
 245     if (nsig == 0)
 246         return 1;
 247
 248     if (shared)
 249         BIO_puts(out, "Shared ");
 250
 251     if (client)
 252         BIO_puts(out, "Requested ");
 253     BIO_puts(out, "Signature Algorithms: ");
 254     for (i = 0; i < nsig; i++) {
 255         int hash_nid, sign_nid;
 256         unsigned char rhash, rsign;
 257         const char *sstr = NULL;
 258         if (shared)
 259             SSL_get_shared_sigalgs(s, i, &sign_nid, &hash_nid, NULL,
 260                                    &rsign, &rhash);
 261         else
 262             SSL_get_sigalgs(s, i, &sign_nid, &hash_nid, NULL, &rsign, &rhash);
 263         if (i)
 264             BIO_puts(out, ":");
 265         sstr = get_sigtype(sign_nid);
 266         if (sstr)
 267             BIO_printf(out, "%s+", sstr);
 268         else
 269             BIO_printf(out, "0x%02X+", (int)rsign);
 270         if (hash_nid != NID_undef)
 271             BIO_printf(out, "%s", OBJ_nid2sn(hash_nid));
 272         else
 273             BIO_printf(out, "0x%02X", (int)rhash);
 274     }
 275     BIO_puts(out, "\n");
 276     return 1;
 277 }
 278
 279 int ssl_print_sigalgs(BIO *out, SSL *s)
 280 {
 281     int nid;
 282     if (!SSL_is_server(s))
 283         ssl_print_client_cert_types(out, s);
 284     do_print_sigalgs(out, s, 0);
 285     do_print_sigalgs(out, s, 1);
 286     if (SSL_get_peer_signature_nid(s, &nid))
 287         BIO_printf(out, "Peer signing digest: %s\n", OBJ_nid2sn(nid));
 288     if (SSL_get_peer_signature_type_nid(s, &nid))
 289         BIO_printf(bio_err, "Peer signature type: %s\n", get_sigtype(nid));
 290     return 1;
 291 }
 292
 293 #ifndef OPENSSL_NO_EC
 294 int ssl_print_point_formats(BIO *out, SSL *s)
 295 {
 296     int i, nformats;
 297     const char *pformats;
 298     nformats = SSL_get0_ec_point_formats(s, &pformats);
 299     if (nformats <= 0)
 300         return 1;
 301     BIO_puts(out, "Supported Elliptic Curve Point Formats: ");
 302     for (i = 0; i < nformats; i++, pformats++) {
 303         if (i)
 304             BIO_puts(out, ":");
 305         switch (*pformats) {
 306         case TLSEXT_ECPOINTFORMAT_uncompressed:
 307             BIO_puts(out, "uncompressed");
 308             break;
 309
 310         case TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime:
 311             BIO_puts(out, "ansiX962_compressed_prime");
 312             break;
 313
 314         case TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2:
 315             BIO_puts(out, "ansiX962_compressed_char2");
 316             break;
 317
 318         default:
 319             BIO_printf(out, "unknown(%d)", (int)*pformats);
 320             break;
 321
 322         }
 323     }
 324     BIO_puts(out, "\n");
 325     return 1;
 326 }
 327
 328 int ssl_print_groups(BIO *out, SSL *s, int noshared)
 329 {
 330     int i, ngroups, *groups, nid;
 331     const char *gname;
 332
 333     ngroups = SSL_get1_groups(s, NULL);
 334     if (ngroups <= 0)
 335         return 1;
 336     groups = app_malloc(ngroups * sizeof(int), "groups to print");
 337     SSL_get1_groups(s, groups);
 338
 339     BIO_puts(out, "Supported Elliptic Groups: ");
 340     for (i = 0; i < ngroups; i++) {
 341         if (i)
 342             BIO_puts(out, ":");
 343         nid = groups[i];
 344         /* If unrecognised print out hex version */
 345         if (nid & TLSEXT_nid_unknown)
 346             BIO_printf(out, "0x%04X", nid & 0xFFFF);
 347         else {
 348             /* TODO(TLS1.3): Get group name here */
 349             /* Use NIST name for curve if it exists */
 350             gname = EC_curve_nid2nist(nid);
 351             if (!gname)
 352                 gname = OBJ_nid2sn(nid);
 353             BIO_printf(out, "%s", gname);
 354         }
 355     }
 356     OPENSSL_free(groups);
 357     if (noshared) {
 358         BIO_puts(out, "\n");
 359         return 1;
 360     }
 361     BIO_puts(out, "\nShared Elliptic groups: ");
 362     ngroups = SSL_get_shared_group(s, -1);
 363     for (i = 0; i < ngroups; i++) {
 364         if (i)
 365             BIO_puts(out, ":");
 366         nid = SSL_get_shared_group(s, i);
 367         /* TODO(TLS1.3): Convert for DH groups */
 368         gname = EC_curve_nid2nist(nid);
 369         if (!gname)
 370             gname = OBJ_nid2sn(nid);
 371         BIO_printf(out, "%s", gname);
 372     }
 373     if (ngroups == 0)
 374         BIO_puts(out, "NONE");
 375     BIO_puts(out, "\n");
 376     return 1;
 377 }
 378 #endif
 379 int ssl_print_tmp_key(BIO *out, SSL *s)
 380 {
 381     EVP_PKEY *key;
 382     if (!SSL_get_server_tmp_key(s, &key))
 383         return 1;
 384     BIO_puts(out, "Server Temp Key: ");
 385     switch (EVP_PKEY_id(key)) {
 386     case EVP_PKEY_RSA:
 387         BIO_printf(out, "RSA, %d bits\n", EVP_PKEY_bits(key));
 388         break;
 389
 390     case EVP_PKEY_DH:
 391         BIO_printf(out, "DH, %d bits\n", EVP_PKEY_bits(key));
 392         break;
 393 #ifndef OPENSSL_NO_EC
 394     case EVP_PKEY_EC:
 395         {
 396             EC_KEY *ec = EVP_PKEY_get1_EC_KEY(key);
 397             int nid;
 398             const char *cname;
 399             nid = EC_GROUP_get_curve_name(EC_KEY_get0_group(ec));
 400             EC_KEY_free(ec);
 401             cname = EC_curve_nid2nist(nid);
 402             if (!cname)
 403                 cname = OBJ_nid2sn(nid);
 404             BIO_printf(out, "ECDH, %s, %d bits\n", cname, EVP_PKEY_bits(key));
 405         }
 406     break;
 407 #endif
 408     default:
 409         BIO_printf(out, "%s, %d bits\n", OBJ_nid2sn(EVP_PKEY_id(key)),
 410                    EVP_PKEY_bits(key));
 411     }
 412     EVP_PKEY_free(key);
 413     return 1;
 414 }
 415
 416 long bio_dump_callback(BIO *bio, int cmd, const char *argp,
 417                        int argi, long argl, long ret)
 418 {
 419     BIO *out;
 420
 421     out = (BIO *)BIO_get_callback_arg(bio);
 422     if (out == NULL)
 423         return (ret);
 424
 425     if (cmd == (BIO_CB_READ | BIO_CB_RETURN)) {
 426         BIO_printf(out, "read from %p [%p] (%lu bytes => %ld (0x%lX))\n",
 427                    (void *)bio, (void *)argp, (unsigned long)argi, ret, ret);
 428         BIO_dump(out, argp, (int)ret);
 429         return (ret);
 430     } else if (cmd == (BIO_CB_WRITE | BIO_CB_RETURN)) {
 431         BIO_printf(out, "write to %p [%p] (%lu bytes => %ld (0x%lX))\n",
 432                    (void *)bio, (void *)argp, (unsigned long)argi, ret, ret);
 433         BIO_dump(out, argp, (int)ret);
 434     }
 435     return (ret);
 436 }
 437
 438 void apps_ssl_info_callback(const SSL *s, int where, int ret)
 439 {
 440     const char *str;
 441     int w;
 442
 443     w = where & ~SSL_ST_MASK;
 444
 445     if (w & SSL_ST_CONNECT)
 446         str = "SSL_connect";
 447     else if (w & SSL_ST_ACCEPT)
 448         str = "SSL_accept";
 449     else
 450         str = "undefined";
 451
 452     if (where & SSL_CB_LOOP) {
 453         BIO_printf(bio_err, "%s:%s\n", str, SSL_state_string_long(s));
 454     } else if (where & SSL_CB_ALERT) {
 455         str = (where & SSL_CB_READ) ? "read" : "write";
 456         BIO_printf(bio_err, "SSL3 alert %s:%s:%s\n",
 457                    str,
 458                    SSL_alert_type_string_long(ret),
 459                    SSL_alert_desc_string_long(ret));
 460     } else if (where & SSL_CB_EXIT) {
 461         if (ret == 0)
 462             BIO_printf(bio_err, "%s:failed in %s\n",
 463                        str, SSL_state_string_long(s));
 464         else if (ret < 0) {
 465             BIO_printf(bio_err, "%s:error in %s\n",
 466                        str, SSL_state_string_long(s));
 467         }
 468     }
 469 }
 470
 471 static STRINT_PAIR ssl_versions[] = {
 472     {"SSL 3.0", SSL3_VERSION},
 473     {"TLS 1.0", TLS1_VERSION},
 474     {"TLS 1.1", TLS1_1_VERSION},
 475     {"TLS 1.2", TLS1_2_VERSION},
 476     {"TLS 1.3", TLS1_3_VERSION},
 477     {"DTLS 1.0", DTLS1_VERSION},
 478     {"DTLS 1.0 (bad)", DTLS1_BAD_VER},
 479     {NULL}
 480 };
 481 static STRINT_PAIR alert_types[] = {
 482     {" close_notify", 0},
 483     {" unexpected_message", 10},
 484     {" bad_record_mac", 20},
 485     {" decryption_failed", 21},
 486     {" record_overflow", 22},
 487     {" decompression_failure", 30},
 488     {" handshake_failure", 40},
 489     {" bad_certificate", 42},
 490     {" unsupported_certificate", 43},
 491     {" certificate_revoked", 44},
 492     {" certificate_expired", 45},
 493     {" certificate_unknown", 46},
 494     {" illegal_parameter", 47},
 495     {" unknown_ca", 48},
 496     {" access_denied", 49},
 497     {" decode_error", 50},
 498     {" decrypt_error", 51},
 499     {" export_restriction", 60},
 500     {" protocol_version", 70},
 501     {" insufficient_security", 71},
 502     {" internal_error", 80},
 503     {" user_canceled", 90},
 504     {" no_renegotiation", 100},
 505     {" unsupported_extension", 110},
 506     {" certificate_unobtainable", 111},
 507     {" unrecognized_name", 112},
 508     {" bad_certificate_status_response", 113},
 509     {" bad_certificate_hash_value", 114},
 510     {" unknown_psk_identity", 115},
 511     {NULL}
 512 };
 513
 514 static STRINT_PAIR handshakes[] = {
 515     {", HelloRequest", 0},
 516     {", ClientHello", 1},
 517     {", ServerHello", 2},
 518     {", HelloVerifyRequest", 3},
 519     {", NewSessionTicket", 4},
 520     {", Certificate", 11},
 521     {", ServerKeyExchange", 12},
 522     {", CertificateRequest", 13},
 523     {", ServerHelloDone", 14},
 524     {", CertificateVerify", 15},
 525     {", ClientKeyExchange", 16},
 526     {", Finished", 20},
 527     {", CertificateUrl", 21},
 528     {", CertificateStatus", 22},
 529     {", SupplementalData", 23},
 530     {NULL}
 531 };
 532
 533 void msg_cb(int write_p, int version, int content_type, const void *buf,
 534             size_t len, SSL *ssl, void *arg)
 535 {
 536     BIO *bio = arg;
 537     const char *str_write_p = write_p ? ">>>" : "<<<";
 538     const char *str_version = lookup(version, ssl_versions, "???");
 539     const char *str_content_type = "", *str_details1 = "", *str_details2 = "";
 540     const unsigned char* bp = buf;
 541
 542     if (version == SSL3_VERSION ||
 543         version == TLS1_VERSION ||
 544         version == TLS1_1_VERSION ||
 545         version == TLS1_2_VERSION ||
 546         version == TLS1_3_VERSION ||
 547         version == DTLS1_VERSION || version == DTLS1_BAD_VER) {
 548         switch (content_type) {
 549         case 20:
 550             str_content_type = "ChangeCipherSpec";
 551             break;
 552         case 21:
 553             str_content_type = "Alert";
 554             str_details1 = ", ???";
 555             if (len == 2) {
 556                 switch (bp[0]) {
 557                 case 1:
 558                     str_details1 = ", warning";
 559                     break;
 560                 case 2:
 561                     str_details1 = ", fatal";
 562                     break;
 563                 }
 564                 str_details2 = lookup((int)bp[1], alert_types, " ???");
 565             }
 566             break;
 567         case 22:
 568             str_content_type = "Handshake";
 569             str_details1 = "???";
 570             if (len > 0)
 571                 str_details1 = lookup((int)bp[0], handshakes, "???");
 572             break;
 573         case 23:
 574             str_content_type = "ApplicationData";
 575             break;
 576 #ifndef OPENSSL_NO_HEARTBEATS
 577         case 24:
 578             str_details1 = ", Heartbeat";
 579
 580             if (len > 0) {
 581                 switch (bp[0]) {
 582                 case 1:
 583                     str_details1 = ", HeartbeatRequest";
 584                     break;
 585                 case 2:
 586                     str_details1 = ", HeartbeatResponse";
 587                     break;
 588                 }
 589             }
 590             break;
 591 #endif
 592         }
 593     }
 594
 595     BIO_printf(bio, "%s %s%s [length %04lx]%s%s\n", str_write_p, str_version,
 596                str_content_type, (unsigned long)len, str_details1,
 597                str_details2);
 598
 599     if (len > 0) {
 600         size_t num, i;
 601
 602         BIO_printf(bio, "   ");
 603         num = len;
 604         for (i = 0; i < num; i++) {
 605             if (i % 16 == 0 && i > 0)
 606                 BIO_printf(bio, "\n   ");
 607             BIO_printf(bio, " %02x", ((const unsigned char *)buf)[i]);
 608         }
 609         if (i < len)
 610             BIO_printf(bio, " ...");
 611         BIO_printf(bio, "\n");
 612     }
 613     (void)BIO_flush(bio);
 614 }
 615
 616 static STRINT_PAIR tlsext_types[] = {
 617     {"server name", TLSEXT_TYPE_server_name},
 618     {"max fragment length", TLSEXT_TYPE_max_fragment_length},
 619     {"client certificate URL", TLSEXT_TYPE_client_certificate_url},
 620     {"trusted CA keys", TLSEXT_TYPE_trusted_ca_keys},
 621     {"truncated HMAC", TLSEXT_TYPE_truncated_hmac},
 622     {"status request", TLSEXT_TYPE_status_request},
 623     {"user mapping", TLSEXT_TYPE_user_mapping},
 624     {"client authz", TLSEXT_TYPE_client_authz},
 625     {"server authz", TLSEXT_TYPE_server_authz},
 626     {"cert type", TLSEXT_TYPE_cert_type},
 627     {"supported_groups", TLSEXT_TYPE_supported_groups},
 628     {"EC point formats", TLSEXT_TYPE_ec_point_formats},
 629     {"SRP", TLSEXT_TYPE_srp},
 630     {"signature algorithms", TLSEXT_TYPE_signature_algorithms},
 631     {"use SRTP", TLSEXT_TYPE_use_srtp},
 632     {"heartbeat", TLSEXT_TYPE_heartbeat},
 633     {"session ticket", TLSEXT_TYPE_session_ticket},
 634     {"renegotiation info", TLSEXT_TYPE_renegotiate},
 635     {"signed certificate timestamps", TLSEXT_TYPE_signed_certificate_timestamp},
 636     {"TLS padding", TLSEXT_TYPE_padding},
 637 #ifdef TLSEXT_TYPE_next_proto_neg
 638     {"next protocol", TLSEXT_TYPE_next_proto_neg},
 639 #endif
 640 #ifdef TLSEXT_TYPE_encrypt_then_mac
 641     {"encrypt-then-mac", TLSEXT_TYPE_encrypt_then_mac},
 642 #endif
 643 #ifdef TLSEXT_TYPE_application_layer_protocol_negotiation
 644     {"application layer protocol negotiation",
 645      TLSEXT_TYPE_application_layer_protocol_negotiation},
 646 #endif
 647 #ifdef TLSEXT_TYPE_extended_master_secret
 648     {"extended master secret", TLSEXT_TYPE_extended_master_secret},
 649 #endif
 650     {NULL}
 651 };
 652
 653 void tlsext_cb(SSL *s, int client_server, int type,
 654                const unsigned char *data, int len, void *arg)
 655 {
 656     BIO *bio = arg;
 657     const char *extname = lookup(type, tlsext_types, "unknown");
 658
 659     BIO_printf(bio, "TLS %s extension \"%s\" (id=%d), len=%d\n",
 660                client_server ? "server" : "client", extname, type, len);
 661     BIO_dump(bio, (const char *)data, len);
 662     (void)BIO_flush(bio);
 663 }
 664
 665 #ifndef OPENSSL_NO_SOCK
 666 int generate_cookie_callback(SSL *ssl, unsigned char *cookie,
 667                              unsigned int *cookie_len)
 668 {
 669     unsigned char *buffer;
 670     size_t length;
 671     unsigned short port;
 672     BIO_ADDR *peer = NULL;
 673
 674     /* Initialize a random secret */
 675     if (!cookie_initialized) {
 676         if (RAND_bytes(cookie_secret, COOKIE_SECRET_LENGTH) <= 0) {
 677             BIO_printf(bio_err, "error setting random cookie secret\n");
 678             return 0;
 679         }
 680         cookie_initialized = 1;
 681     }
 682
 683     peer = BIO_ADDR_new();
 684     if (peer == NULL) {
 685         BIO_printf(bio_err, "memory full\n");
 686         return 0;
 687     }
 688
 689     /* Read peer information */
 690     (void)BIO_dgram_get_peer(SSL_get_rbio(ssl), peer);
 691
 692     /* Create buffer with peer's address and port */
 693     BIO_ADDR_rawaddress(peer, NULL, &length);
 694     OPENSSL_assert(length != 0);
 695     port = BIO_ADDR_rawport(peer);
 696     length += sizeof(port);
 697     buffer = app_malloc(length, "cookie generate buffer");
 698
 699     memcpy(buffer, &port, sizeof(port));
 700     BIO_ADDR_rawaddress(peer, buffer + sizeof(port), NULL);
 701
 702     /* Calculate HMAC of buffer using the secret */
 703     HMAC(EVP_sha1(), cookie_secret, COOKIE_SECRET_LENGTH,
 704          buffer, length, cookie, cookie_len);
 705
 706     OPENSSL_free(buffer);
 707     BIO_ADDR_free(peer);
 708
 709     return 1;
 710 }
 711
 712 int verify_cookie_callback(SSL *ssl, const unsigned char *cookie,
 713                            unsigned int cookie_len)
 714 {
 715     unsigned char result[EVP_MAX_MD_SIZE];
 716     unsigned int resultlength;
 717
 718     /* Note: we check cookie_initialized because if it's not,
 719      * it cannot be valid */
 720     if (cookie_initialized
 721         && generate_cookie_callback(ssl, result, &resultlength)
 722         && cookie_len == resultlength
 723         && memcmp(result, cookie, resultlength) == 0)
 724         return 1;
 725
 726     return 0;
 727 }
 728 #endif
 729
 730 /*
 731  * Example of extended certificate handling. Where the standard support of
 732  * one certificate per algorithm is not sufficient an application can decide
 733  * which certificate(s) to use at runtime based on whatever criteria it deems
 734  * appropriate.
 735  */
 736
 737 /* Linked list of certificates, keys and chains */
 738 struct ssl_excert_st {
 739     int certform;
 740     const char *certfile;
 741     int keyform;
 742     const char *keyfile;
 743     const char *chainfile;
 744     X509 *cert;
 745     EVP_PKEY *key;
 746     STACK_OF(X509) *chain;
 747     int build_chain;
 748     struct ssl_excert_st *next, *prev;
 749 };
 750
 751 static STRINT_PAIR chain_flags[] = {
 752     {"Overall Validity", CERT_PKEY_VALID},
 753     {"Sign with EE key", CERT_PKEY_SIGN},
 754     {"EE signature", CERT_PKEY_EE_SIGNATURE},
 755     {"CA signature", CERT_PKEY_CA_SIGNATURE},
 756     {"EE key parameters", CERT_PKEY_EE_PARAM},
 757     {"CA key parameters", CERT_PKEY_CA_PARAM},
 758     {"Explicitly sign with EE key", CERT_PKEY_EXPLICIT_SIGN},
 759     {"Issuer Name", CERT_PKEY_ISSUER_NAME},
 760     {"Certificate Type", CERT_PKEY_CERT_TYPE},
 761     {NULL}
 762 };
 763
 764 static void print_chain_flags(SSL *s, int flags)
 765 {
 766     STRINT_PAIR *pp;
 767
 768     for (pp = chain_flags; pp->name; ++pp)
 769         BIO_printf(bio_err, "\t%s: %s\n",
 770                    pp->name,
 771                    (flags & pp->retval) ? "OK" : "NOT OK");
 772     BIO_printf(bio_err, "\tSuite B: ");
 773     if (SSL_set_cert_flags(s, 0) & SSL_CERT_FLAG_SUITEB_128_LOS)
 774         BIO_puts(bio_err, flags & CERT_PKEY_SUITEB ? "OK\n" : "NOT OK\n");
 775     else
 776         BIO_printf(bio_err, "not tested\n");
 777 }
 778
 779 /*
 780  * Very basic selection callback: just use any certificate chain reported as
 781  * valid. More sophisticated could prioritise according to local policy.
 782  */
 783 static int set_cert_cb(SSL *ssl, void *arg)
 784 {
 785     int i, rv;
 786     SSL_EXCERT *exc = arg;
 787 #ifdef CERT_CB_TEST_RETRY
 788     static int retry_cnt;
 789     if (retry_cnt < 5) {
 790         retry_cnt++;
 791         BIO_printf(bio_err,
 792                    "Certificate callback retry test: count %d\n",
 793                    retry_cnt);
 794         return -1;
 795     }
 796 #endif
 797     SSL_certs_clear(ssl);
 798
 799     if (!exc)
 800         return 1;
 801
 802     /*
 803      * Go to end of list and traverse backwards since we prepend newer
 804      * entries this retains the original order.
 805      */
 806     while (exc->next)
 807         exc = exc->next;
 808
 809     i = 0;
 810
 811     while (exc) {
 812         i++;
 813         rv = SSL_check_chain(ssl, exc->cert, exc->key, exc->chain);
 814         BIO_printf(bio_err, "Checking cert chain %d:\nSubject: ", i);
 815         X509_NAME_print_ex(bio_err, X509_get_subject_name(exc->cert), 0,
 816                            XN_FLAG_ONELINE);
 817         BIO_puts(bio_err, "\n");
 818         print_chain_flags(ssl, rv);
 819         if (rv & CERT_PKEY_VALID) {
 820             if (!SSL_use_certificate(ssl, exc->cert)
 821                     || !SSL_use_PrivateKey(ssl, exc->key)) {
 822                 return 0;
 823             }
 824             /*
 825              * NB: we wouldn't normally do this as it is not efficient
 826              * building chains on each connection better to cache the chain
 827              * in advance.
 828              */
 829             if (exc->build_chain) {
 830                 if (!SSL_build_cert_chain(ssl, 0))
 831                     return 0;
 832             } else if (exc->chain)
 833                 SSL_set1_chain(ssl, exc->chain);
 834         }
 835         exc = exc->prev;
 836     }
 837     return 1;
 838 }
 839
 840 void ssl_ctx_set_excert(SSL_CTX *ctx, SSL_EXCERT *exc)
 841 {
 842     SSL_CTX_set_cert_cb(ctx, set_cert_cb, exc);
 843 }
 844
 845 static int ssl_excert_prepend(SSL_EXCERT **pexc)
 846 {
 847     SSL_EXCERT *exc = app_malloc(sizeof(*exc), "prepend cert");
 848
 849     memset(exc, 0, sizeof(*exc));
 850
 851     exc->next = *pexc;
 852     *pexc = exc;
 853
 854     if (exc->next) {
 855         exc->certform = exc->next->certform;
 856         exc->keyform = exc->next->keyform;
 857         exc->next->prev = exc;
 858     } else {
 859         exc->certform = FORMAT_PEM;
 860         exc->keyform = FORMAT_PEM;
 861     }
 862     return 1;
 863
 864 }
 865
 866 void ssl_excert_free(SSL_EXCERT *exc)
 867 {
 868     SSL_EXCERT *curr;
 869
 870     if (!exc)
 871         return;
 872     while (exc) {
 873         X509_free(exc->cert);
 874         EVP_PKEY_free(exc->key);
 875         sk_X509_pop_free(exc->chain, X509_free);
 876         curr = exc;
 877         exc = exc->next;
 878         OPENSSL_free(curr);
 879     }
 880 }
 881
 882 int load_excert(SSL_EXCERT **pexc)
 883 {
 884     SSL_EXCERT *exc = *pexc;
 885     if (!exc)
 886         return 1;
 887     /* If nothing in list, free and set to NULL */
 888     if (!exc->certfile && !exc->next) {
 889         ssl_excert_free(exc);
 890         *pexc = NULL;
 891         return 1;
 892     }
 893     for (; exc; exc = exc->next) {
 894         if (!exc->certfile) {
 895             BIO_printf(bio_err, "Missing filename\n");
 896             return 0;
 897         }
 898         exc->cert = load_cert(exc->certfile, exc->certform,
 899                               "Server Certificate");
 900         if (!exc->cert)
 901             return 0;
 902         if (exc->keyfile) {
 903             exc->key = load_key(exc->keyfile, exc->keyform,
 904                                 0, NULL, NULL, "Server Key");
 905         } else {
 906             exc->key = load_key(exc->certfile, exc->certform,
 907                                 0, NULL, NULL, "Server Key");
 908         }
 909         if (!exc->key)
 910             return 0;
 911         if (exc->chainfile) {
 912             if (!load_certs(exc->chainfile, &exc->chain, FORMAT_PEM, NULL,
 913                             "Server Chain"))
 914                 return 0;
 915         }
 916     }
 917     return 1;
 918 }
 919
 920 enum range { OPT_X_ENUM };
 921
 922 int args_excert(int opt, SSL_EXCERT **pexc)
 923 {
 924     SSL_EXCERT *exc = *pexc;
 925
 926     assert(opt > OPT_X__FIRST);
 927     assert(opt < OPT_X__LAST);
 928
 929     if (exc == NULL) {
 930         if (!ssl_excert_prepend(&exc)) {
 931             BIO_printf(bio_err, " %s: Error initialising xcert\n",
 932                        opt_getprog());
 933             goto err;
 934         }
 935         *pexc = exc;
 936     }
 937
 938     switch ((enum range)opt) {
 939     case OPT_X__FIRST:
 940     case OPT_X__LAST:
 941         return 0;
 942     case OPT_X_CERT:
 943         if (exc->certfile && !ssl_excert_prepend(&exc)) {
 944             BIO_printf(bio_err, "%s: Error adding xcert\n", opt_getprog());
 945             goto err;
 946         }
 947         exc->certfile = opt_arg();
 948         break;
 949     case OPT_X_KEY:
 950         if (exc->keyfile) {
 951             BIO_printf(bio_err, "%s: Key already specified\n", opt_getprog());
 952             goto err;
 953         }
 954         exc->keyfile = opt_arg();
 955         break;
 956     case OPT_X_CHAIN:
 957         if (exc->chainfile) {
 958             BIO_printf(bio_err, "%s: Chain already specified\n",
 959                        opt_getprog());
 960             goto err;
 961         }
 962         exc->chainfile = opt_arg();
 963         break;
 964     case OPT_X_CHAIN_BUILD:
 965         exc->build_chain = 1;
 966         break;
 967     case OPT_X_CERTFORM:
 968         if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &exc->certform))
 969             return 0;
 970         break;
 971     case OPT_X_KEYFORM:
 972         if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &exc->keyform))
 973             return 0;
 974         break;
 975     }
 976     return 1;
 977
 978  err:
 979     ERR_print_errors(bio_err);
 980     ssl_excert_free(exc);
 981     *pexc = NULL;
 982     return 0;
 983 }
 984
 985 static void print_raw_cipherlist(SSL *s)
 986 {
 987     const unsigned char *rlist;
 988     static const unsigned char scsv_id[] = { 0, 0xFF };
 989     size_t i, rlistlen, num;
 990     if (!SSL_is_server(s))
 991         return;
 992     num = SSL_get0_raw_cipherlist(s, NULL);
 993     OPENSSL_assert(num == 2);
 994     rlistlen = SSL_get0_raw_cipherlist(s, &rlist);
 995     BIO_puts(bio_err, "Client cipher list: ");
 996     for (i = 0; i < rlistlen; i += num, rlist += num) {
 997         const SSL_CIPHER *c = SSL_CIPHER_find(s, rlist);
 998         if (i)
 999             BIO_puts(bio_err, ":");
1000         if (c)
1001             BIO_puts(bio_err, SSL_CIPHER_get_name(c));
1002         else if (!memcmp(rlist, scsv_id, num))
1003             BIO_puts(bio_err, "SCSV");
1004         else {
1005             size_t j;
1006             BIO_puts(bio_err, "0x");
1007             for (j = 0; j < num; j++)
1008                 BIO_printf(bio_err, "%02X", rlist[j]);
1009         }
1010     }
1011     BIO_puts(bio_err, "\n");
1012 }
1013
1014 /*
1015  * Hex encoder for TLSA RRdata, not ':' delimited.
1016  */
1017 static char *hexencode(const unsigned char *data, size_t len)
1018 {
1019     static const char *hex = "0123456789abcdef";
1020     char *out;
1021     char *cp;
1022     size_t outlen = 2 * len + 1;
1023     int ilen = (int) outlen;
1024
1025     if (outlen < len || ilen < 0 || outlen != (size_t)ilen) {
1026         BIO_printf(bio_err, "%s: %" PRIu64 "-byte buffer too large to hexencode\n",
1027                    opt_getprog(), (uint64_t)len);
1028         exit(1);
1029     }
1030     cp = out = app_malloc(ilen, "TLSA hex data buffer");
1031
1032     while (len-- > 0) {
1033         *cp++ = hex[(*data >> 4) & 0x0f];
1034         *cp++ = hex[*data++ & 0x0f];
1035     }
1036     *cp = '\0';
1037     return out;
1038 }
1039
1040 void print_verify_detail(SSL *s, BIO *bio)
1041 {
1042     int mdpth;
1043     EVP_PKEY *mspki;
1044     long verify_err = SSL_get_verify_result(s);
1045
1046     if (verify_err == X509_V_OK) {
1047         const char *peername = SSL_get0_peername(s);
1048
1049         BIO_printf(bio, "Verification: OK\n");
1050         if (peername != NULL)
1051             BIO_printf(bio, "Verified peername: %s\n", peername);
1052     } else {
1053         const char *reason = X509_verify_cert_error_string(verify_err);
1054
1055         BIO_printf(bio, "Verification error: %s\n", reason);
1056     }
1057
1058     if ((mdpth = SSL_get0_dane_authority(s, NULL, &mspki)) >= 0) {
1059         uint8_t usage, selector, mtype;
1060         const unsigned char *data = NULL;
1061         size_t dlen = 0;
1062         char *hexdata;
1063
1064         mdpth = SSL_get0_dane_tlsa(s, &usage, &selector, &mtype, &data, &dlen);
1065
1066         /*
1067          * The TLSA data field can be quite long when it is a certificate,
1068          * public key or even a SHA2-512 digest.  Because the initial octets of
1069          * ASN.1 certificates and public keys contain mostly boilerplate OIDs
1070          * and lengths, we show the last 12 bytes of the data instead, as these
1071          * are more likely to distinguish distinct TLSA records.
1072          */
1073 #define TLSA_TAIL_SIZE 12
1074         if (dlen > TLSA_TAIL_SIZE)
1075             hexdata = hexencode(data + dlen - TLSA_TAIL_SIZE, TLSA_TAIL_SIZE);
1076         else
1077             hexdata = hexencode(data, dlen);
1078         BIO_printf(bio, "DANE TLSA %d %d %d %s%s %s at depth %d\n",
1079                    usage, selector, mtype,
1080                    (dlen > TLSA_TAIL_SIZE) ? "..." : "", hexdata,
1081                    (mspki != NULL) ? "signed the certificate" :
1082                    mdpth ? "matched TA certificate" : "matched EE certificate",
1083                    mdpth);
1084         OPENSSL_free(hexdata);
1085     }
1086 }
1087
1088 void print_ssl_summary(SSL *s)
1089 {
1090     const SSL_CIPHER *c;
1091     X509 *peer;
1092     /* const char *pnam = SSL_is_server(s) ? "client" : "server"; */
1093
1094     BIO_printf(bio_err, "Protocol version: %s\n", SSL_get_version(s));
1095     print_raw_cipherlist(s);
1096     c = SSL_get_current_cipher(s);
1097     BIO_printf(bio_err, "Ciphersuite: %s\n", SSL_CIPHER_get_name(c));
1098     do_print_sigalgs(bio_err, s, 0);
1099     peer = SSL_get_peer_certificate(s);
1100     if (peer) {
1101         int nid;
1102
1103         BIO_puts(bio_err, "Peer certificate: ");
1104         X509_NAME_print_ex(bio_err, X509_get_subject_name(peer),
1105                            0, XN_FLAG_ONELINE);
1106         BIO_puts(bio_err, "\n");
1107         if (SSL_get_peer_signature_nid(s, &nid))
1108             BIO_printf(bio_err, "Hash used: %s\n", OBJ_nid2sn(nid));
1109         if (SSL_get_peer_signature_type_nid(s, &nid))
1110             BIO_printf(bio_err, "Signature type: %s\n", get_sigtype(nid));
1111         print_verify_detail(s, bio_err);
1112     } else
1113         BIO_puts(bio_err, "No peer certificate\n");
1114     X509_free(peer);
1115 #ifndef OPENSSL_NO_EC
1116     ssl_print_point_formats(bio_err, s);
1117     if (SSL_is_server(s))
1118         ssl_print_groups(bio_err, s, 1);
1119     else
1120         ssl_print_tmp_key(bio_err, s);
1121 #else
1122     if (!SSL_is_server(s))
1123         ssl_print_tmp_key(bio_err, s);
1124 #endif
1125 }
1126
1127 int config_ctx(SSL_CONF_CTX *cctx, STACK_OF(OPENSSL_STRING) *str,
1128                SSL_CTX *ctx)
1129 {
1130     int i;
1131
1132     SSL_CONF_CTX_set_ssl_ctx(cctx, ctx);
1133     for (i = 0; i < sk_OPENSSL_STRING_num(str); i += 2) {
1134         const char *flag = sk_OPENSSL_STRING_value(str, i);
1135         const char *arg = sk_OPENSSL_STRING_value(str, i + 1);
1136         if (SSL_CONF_cmd(cctx, flag, arg) <= 0) {
1137             if (arg)
1138                 BIO_printf(bio_err, "Error with command: \"%s %s\"\n",
1139                            flag, arg);
1140             else
1141                 BIO_printf(bio_err, "Error with command: \"%s\"\n", flag);
1142             ERR_print_errors(bio_err);
1143             return 0;
1144         }
1145     }
1146     if (!SSL_CONF_CTX_finish(cctx)) {
1147         BIO_puts(bio_err, "Error finishing context\n");
1148         ERR_print_errors(bio_err);
1149         return 0;
1150     }
1151     return 1;
1152 }
1153
1154 static int add_crls_store(X509_STORE *st, STACK_OF(X509_CRL) *crls)
1155 {
1156     X509_CRL *crl;
1157     int i;
1158     for (i = 0; i < sk_X509_CRL_num(crls); i++) {
1159         crl = sk_X509_CRL_value(crls, i);
1160         X509_STORE_add_crl(st, crl);
1161     }
1162     return 1;
1163 }
1164
1165 int ssl_ctx_add_crls(SSL_CTX *ctx, STACK_OF(X509_CRL) *crls, int crl_download)
1166 {
1167     X509_STORE *st;
1168     st = SSL_CTX_get_cert_store(ctx);
1169     add_crls_store(st, crls);
1170     if (crl_download)
1171         store_setup_crl_download(st);
1172     return 1;
1173 }
1174
1175 int ssl_load_stores(SSL_CTX *ctx,
1176                     const char *vfyCApath, const char *vfyCAfile,
1177                     const char *chCApath, const char *chCAfile,
1178                     STACK_OF(X509_CRL) *crls, int crl_download)
1179 {
1180     X509_STORE *vfy = NULL, *ch = NULL;
1181     int rv = 0;
1182     if (vfyCApath != NULL || vfyCAfile != NULL) {
1183         vfy = X509_STORE_new();
1184         if (vfy == NULL)
1185             goto err;
1186         if (!X509_STORE_load_locations(vfy, vfyCAfile, vfyCApath))
1187             goto err;
1188         add_crls_store(vfy, crls);
1189         SSL_CTX_set1_verify_cert_store(ctx, vfy);
1190         if (crl_download)
1191             store_setup_crl_download(vfy);
1192     }
1193     if (chCApath != NULL || chCAfile != NULL) {
1194         ch = X509_STORE_new();
1195         if (ch == NULL)
1196             goto err;
1197         if (!X509_STORE_load_locations(ch, chCAfile, chCApath))
1198             goto err;
1199         SSL_CTX_set1_chain_cert_store(ctx, ch);
1200     }
1201     rv = 1;
1202  err:
1203     X509_STORE_free(vfy);
1204     X509_STORE_free(ch);
1205     return rv;
1206 }
1207
1208 /* Verbose print out of security callback */
1209
1210 typedef struct {
1211     BIO *out;
1212     int verbose;
1213     int (*old_cb) (const SSL *s, const SSL_CTX *ctx, int op, int bits, int nid,
1214                    void *other, void *ex);
1215 } security_debug_ex;
1216
1217 static STRINT_PAIR callback_types[] = {
1218     {"Supported Ciphersuite", SSL_SECOP_CIPHER_SUPPORTED},
1219     {"Shared Ciphersuite", SSL_SECOP_CIPHER_SHARED},
1220     {"Check Ciphersuite", SSL_SECOP_CIPHER_CHECK},
1221 #ifndef OPENSSL_NO_DH
1222     {"Temp DH key bits", SSL_SECOP_TMP_DH},
1223 #endif
1224     {"Supported Curve", SSL_SECOP_CURVE_SUPPORTED},
1225     {"Shared Curve", SSL_SECOP_CURVE_SHARED},
1226     {"Check Curve", SSL_SECOP_CURVE_CHECK},
1227     {"Supported Signature Algorithm digest", SSL_SECOP_SIGALG_SUPPORTED},
1228     {"Shared Signature Algorithm digest", SSL_SECOP_SIGALG_SHARED},
1229     {"Check Signature Algorithm digest", SSL_SECOP_SIGALG_CHECK},
1230     {"Signature Algorithm mask", SSL_SECOP_SIGALG_MASK},
1231     {"Certificate chain EE key", SSL_SECOP_EE_KEY},
1232     {"Certificate chain CA key", SSL_SECOP_CA_KEY},
1233     {"Peer Chain EE key", SSL_SECOP_PEER_EE_KEY},
1234     {"Peer Chain CA key", SSL_SECOP_PEER_CA_KEY},
1235     {"Certificate chain CA digest", SSL_SECOP_CA_MD},
1236     {"Peer chain CA digest", SSL_SECOP_PEER_CA_MD},
1237     {"SSL compression", SSL_SECOP_COMPRESSION},
1238     {"Session ticket", SSL_SECOP_TICKET},
1239     {NULL}
1240 };
1241
1242 static int security_callback_debug(const SSL *s, const SSL_CTX *ctx,
1243                                    int op, int bits, int nid,
1244                                    void *other, void *ex)
1245 {
1246     security_debug_ex *sdb = ex;
1247     int rv, show_bits = 1, cert_md = 0;
1248     const char *nm;
1249     rv = sdb->old_cb(s, ctx, op, bits, nid, other, ex);
1250     if (rv == 1 && sdb->verbose < 2)
1251         return 1;
1252     BIO_puts(sdb->out, "Security callback: ");
1253
1254     nm = lookup(op, callback_types, NULL);
1255     switch (op) {
1256     case SSL_SECOP_TICKET:
1257     case SSL_SECOP_COMPRESSION:
1258         show_bits = 0;
1259         nm = NULL;
1260         break;
1261     case SSL_SECOP_VERSION:
1262         BIO_printf(sdb->out, "Version=%s", lookup(nid, ssl_versions, "???"));
1263         show_bits = 0;
1264         nm = NULL;
1265         break;
1266     case SSL_SECOP_CA_MD:
1267     case SSL_SECOP_PEER_CA_MD:
1268         cert_md = 1;
1269         break;
1270     }
1271     if (nm)
1272         BIO_printf(sdb->out, "%s=", nm);
1273
1274     switch (op & SSL_SECOP_OTHER_TYPE) {
1275
1276     case SSL_SECOP_OTHER_CIPHER:
1277         BIO_puts(sdb->out, SSL_CIPHER_get_name(other));
1278         break;
1279
1280 #ifndef OPENSSL_NO_EC
1281     case SSL_SECOP_OTHER_CURVE:
1282         {
1283             const char *cname;
1284             cname = EC_curve_nid2nist(nid);
1285             if (cname == NULL)
1286                 cname = OBJ_nid2sn(nid);
1287             BIO_puts(sdb->out, cname);
1288         }
1289         break;
1290 #endif
1291 #ifndef OPENSSL_NO_DH
1292     case SSL_SECOP_OTHER_DH:
1293         {
1294             DH *dh = other;
1295             BIO_printf(sdb->out, "%d", DH_bits(dh));
1296             break;
1297         }
1298 #endif
1299     case SSL_SECOP_OTHER_CERT:
1300         {
1301             if (cert_md) {
1302                 int sig_nid = X509_get_signature_nid(other);
1303                 BIO_puts(sdb->out, OBJ_nid2sn(sig_nid));
1304             } else {
1305                 EVP_PKEY *pkey = X509_get0_pubkey(other);
1306                 const char *algname = "";
1307                 EVP_PKEY_asn1_get0_info(NULL, NULL, NULL, NULL,
1308                                         &algname, EVP_PKEY_get0_asn1(pkey));
1309                 BIO_printf(sdb->out, "%s, bits=%d",
1310                            algname, EVP_PKEY_bits(pkey));
1311             }
1312             break;
1313         }
1314     case SSL_SECOP_OTHER_SIGALG:
1315         {
1316             const unsigned char *salg = other;
1317             const char *sname = NULL;
1318             switch (salg[1]) {
1319             case TLSEXT_signature_anonymous:
1320                 sname = "anonymous";
1321                 break;
1322             case TLSEXT_signature_rsa:
1323                 sname = "RSA";
1324                 break;
1325             case TLSEXT_signature_dsa:
1326                 sname = "DSA";
1327                 break;
1328             case TLSEXT_signature_ecdsa:
1329                 sname = "ECDSA";
1330                 break;
1331             }
1332
1333             BIO_puts(sdb->out, OBJ_nid2sn(nid));
1334             if (sname)
1335                 BIO_printf(sdb->out, ", algorithm=%s", sname);
1336             else
1337                 BIO_printf(sdb->out, ", algid=%d", salg[1]);
1338             break;
1339         }
1340
1341     }
1342
1343     if (show_bits)
1344         BIO_printf(sdb->out, ", security bits=%d", bits);
1345     BIO_printf(sdb->out, ": %s\n", rv ? "yes" : "no");
1346     return rv;
1347 }
1348
1349 void ssl_ctx_security_debug(SSL_CTX *ctx, int verbose)
1350 {
1351     static security_debug_ex sdb;
1352
1353     sdb.out = bio_err;
1354     sdb.verbose = verbose;
1355     sdb.old_cb = SSL_CTX_get_security_callback(ctx);
1356     SSL_CTX_set_security_callback(ctx, security_callback_debug);
1357     SSL_CTX_set0_security_ex_data(ctx, &sdb);
1358 }
1359
1360 static void keylog_callback(const SSL *ssl, const char *line)
1361 {
1362     if (bio_keylog == NULL) {
1363         BIO_printf(bio_err, "Keylog callback is invoked without valid file!\n");
1364         return;
1365     }
1366
1367     /*
1368      * There might be concurrent writers to the keylog file, so we must ensure
1369      * that the given line is written at once.
1370      */
1371     BIO_printf(bio_keylog, "%s\n", line);
1372     (void)BIO_flush(bio_keylog);
1373 }
1374
1375 int set_keylog_file(SSL_CTX *ctx, const char *keylog_file)
1376 {
1377     /* Close any open files */
1378     BIO_free_all(bio_keylog);
1379     bio_keylog = NULL;
1380
1381     if (ctx == NULL || keylog_file == NULL) {
1382         /* Keylogging is disabled, OK. */
1383         return 0;
1384     }
1385
1386     /*
1387      * Append rather than write in order to allow concurrent modification.
1388      * Furthermore, this preserves existing keylog files which is useful when
1389      * the tool is run multiple times.
1390      */
1391     bio_keylog = BIO_new_file(keylog_file, "a");
1392     if (bio_keylog == NULL) {
1393         BIO_printf(bio_err, "Error writing keylog file %s\n", keylog_file);
1394         return 1;
1395     }
1396
1397     /* Write a header for seekable, empty files (this excludes pipes). */
1398     if (BIO_tell(bio_keylog) == 0) {
1399         BIO_puts(bio_keylog,
1400                  "# SSL/TLS secrets log file, generated by OpenSSL\n");
1401         (void)BIO_flush(bio_keylog);
1402     }
1403     SSL_CTX_set_keylog_callback(ctx, keylog_callback);
1404     return 0;
1405 }