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 static unsigned long nmflag = XN_FLAG_ONELINE;
  37
  38 int set_nameopt(const char *arg)
  39 {
  40   return set_name_ex(&nmflag, arg);
  41 }
  42
  43 static const char *lookup(int val, const STRINT_PAIR* list, const char* def)
  44 {
  45     for ( ; list->name; ++list)
  46         if (list->retval == val)
  47             return list->name;
  48     return def;
  49 }
  50
  51 int verify_callback(int ok, X509_STORE_CTX *ctx)
  52 {
  53     X509 *err_cert;
  54     int err, depth;
  55
  56     err_cert = X509_STORE_CTX_get_current_cert(ctx);
  57     err = X509_STORE_CTX_get_error(ctx);
  58     depth = X509_STORE_CTX_get_error_depth(ctx);
  59
  60     if (!verify_args.quiet || !ok) {
  61         BIO_printf(bio_err, "depth=%d ", depth);
  62         if (err_cert) {
  63             X509_NAME_print_ex(bio_err,
  64                                X509_get_subject_name(err_cert),
  65                                0, nmflag);
  66             BIO_puts(bio_err, "\n");
  67         } else
  68             BIO_puts(bio_err, "<no cert>\n");
  69     }
  70     if (!ok) {
  71         BIO_printf(bio_err, "verify error:num=%d:%s\n", err,
  72                    X509_verify_cert_error_string(err));
  73         if (verify_args.depth >= depth) {
  74             if (!verify_args.return_error)
  75                 ok = 1;
  76             verify_args.error = err;
  77         } else {
  78             ok = 0;
  79             verify_args.error = X509_V_ERR_CERT_CHAIN_TOO_LONG;
  80         }
  81     }
  82     switch (err) {
  83     case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
  84         BIO_puts(bio_err, "issuer= ");
  85         X509_NAME_print_ex(bio_err, X509_get_issuer_name(err_cert),
  86                            0, nmflag);
  87         BIO_puts(bio_err, "\n");
  88         break;
  89     case X509_V_ERR_CERT_NOT_YET_VALID:
  90     case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
  91         BIO_printf(bio_err, "notBefore=");
  92         ASN1_TIME_print(bio_err, X509_get0_notBefore(err_cert));
  93         BIO_printf(bio_err, "\n");
  94         break;
  95     case X509_V_ERR_CERT_HAS_EXPIRED:
  96     case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
  97         BIO_printf(bio_err, "notAfter=");
  98         ASN1_TIME_print(bio_err, X509_get0_notAfter(err_cert));
  99         BIO_printf(bio_err, "\n");
 100         break;
 101     case X509_V_ERR_NO_EXPLICIT_POLICY:
 102         if (!verify_args.quiet)
 103             policies_print(ctx);
 104         break;
 105     }
 106     if (err == X509_V_OK && ok == 2 && !verify_args.quiet)
 107         policies_print(ctx);
 108     if (ok && !verify_args.quiet)
 109         BIO_printf(bio_err, "verify return:%d\n", ok);
 110     return (ok);
 111 }
 112
 113 int set_cert_stuff(SSL_CTX *ctx, char *cert_file, char *key_file)
 114 {
 115     if (cert_file != NULL) {
 116         if (SSL_CTX_use_certificate_file(ctx, cert_file,
 117                                          SSL_FILETYPE_PEM) <= 0) {
 118             BIO_printf(bio_err, "unable to get certificate from '%s'\n",
 119                        cert_file);
 120             ERR_print_errors(bio_err);
 121             return (0);
 122         }
 123         if (key_file == NULL)
 124             key_file = cert_file;
 125         if (SSL_CTX_use_PrivateKey_file(ctx, key_file, SSL_FILETYPE_PEM) <= 0) {
 126             BIO_printf(bio_err, "unable to get private key from '%s'\n",
 127                        key_file);
 128             ERR_print_errors(bio_err);
 129             return (0);
 130         }
 131
 132         /*
 133          * If we are using DSA, we can copy the parameters from the private
 134          * key
 135          */
 136
 137         /*
 138          * Now we know that a key and cert have been set against the SSL
 139          * context
 140          */
 141         if (!SSL_CTX_check_private_key(ctx)) {
 142             BIO_printf(bio_err,
 143                        "Private key does not match the certificate public key\n");
 144             return (0);
 145         }
 146     }
 147     return (1);
 148 }
 149
 150 int set_cert_key_stuff(SSL_CTX *ctx, X509 *cert, EVP_PKEY *key,
 151                        STACK_OF(X509) *chain, int build_chain)
 152 {
 153     int chflags = chain ? SSL_BUILD_CHAIN_FLAG_CHECK : 0;
 154     if (cert == NULL)
 155         return 1;
 156     if (SSL_CTX_use_certificate(ctx, cert) <= 0) {
 157         BIO_printf(bio_err, "error setting certificate\n");
 158         ERR_print_errors(bio_err);
 159         return 0;
 160     }
 161
 162     if (SSL_CTX_use_PrivateKey(ctx, key) <= 0) {
 163         BIO_printf(bio_err, "error setting private key\n");
 164         ERR_print_errors(bio_err);
 165         return 0;
 166     }
 167
 168     /*
 169      * Now we know that a key and cert have been set against the SSL context
 170      */
 171     if (!SSL_CTX_check_private_key(ctx)) {
 172         BIO_printf(bio_err,
 173                    "Private key does not match the certificate public key\n");
 174         return 0;
 175     }
 176     if (chain && !SSL_CTX_set1_chain(ctx, chain)) {
 177         BIO_printf(bio_err, "error setting certificate chain\n");
 178         ERR_print_errors(bio_err);
 179         return 0;
 180     }
 181     if (build_chain && !SSL_CTX_build_cert_chain(ctx, chflags)) {
 182         BIO_printf(bio_err, "error building certificate chain\n");
 183         ERR_print_errors(bio_err);
 184         return 0;
 185     }
 186     return 1;
 187 }
 188
 189 static STRINT_PAIR cert_type_list[] = {
 190     {"RSA sign", TLS_CT_RSA_SIGN},
 191     {"DSA sign", TLS_CT_DSS_SIGN},
 192     {"RSA fixed DH", TLS_CT_RSA_FIXED_DH},
 193     {"DSS fixed DH", TLS_CT_DSS_FIXED_DH},
 194     {"ECDSA sign", TLS_CT_ECDSA_SIGN},
 195     {"RSA fixed ECDH", TLS_CT_RSA_FIXED_ECDH},
 196     {"ECDSA fixed ECDH", TLS_CT_ECDSA_FIXED_ECDH},
 197     {"GOST01 Sign", TLS_CT_GOST01_SIGN},
 198     {NULL}
 199 };
 200
 201 static void ssl_print_client_cert_types(BIO *bio, SSL *s)
 202 {
 203     const unsigned char *p;
 204     int i;
 205     int cert_type_num = SSL_get0_certificate_types(s, &p);
 206     if (!cert_type_num)
 207         return;
 208     BIO_puts(bio, "Client Certificate Types: ");
 209     for (i = 0; i < cert_type_num; i++) {
 210         unsigned char cert_type = p[i];
 211         const char *cname = lookup((int)cert_type, cert_type_list, NULL);
 212
 213         if (i)
 214             BIO_puts(bio, ", ");
 215         if (cname)
 216             BIO_puts(bio, cname);
 217         else
 218             BIO_printf(bio, "UNKNOWN (%d),", cert_type);
 219     }
 220     BIO_puts(bio, "\n");
 221 }
 222
 223 static const char *get_sigtype(int nid)
 224 {
 225     switch (nid) {
 226     case EVP_PKEY_RSA:
 227         return "RSA";
 228
 229     case EVP_PKEY_RSA_PSS:
 230         return "RSA-PSS";
 231
 232     case EVP_PKEY_DSA:
 233         return "DSA";
 234
 235      case EVP_PKEY_EC:
 236         return "ECDSA";
 237
 238     default:
 239         return NULL;
 240     }
 241 }
 242
 243 static int do_print_sigalgs(BIO *out, SSL *s, int shared)
 244 {
 245     int i, nsig, client;
 246     client = SSL_is_server(s) ? 0 : 1;
 247     if (shared)
 248         nsig = SSL_get_shared_sigalgs(s, 0, NULL, NULL, NULL, NULL, NULL);
 249     else
 250         nsig = SSL_get_sigalgs(s, -1, NULL, NULL, NULL, NULL, NULL);
 251     if (nsig == 0)
 252         return 1;
 253
 254     if (shared)
 255         BIO_puts(out, "Shared ");
 256
 257     if (client)
 258         BIO_puts(out, "Requested ");
 259     BIO_puts(out, "Signature Algorithms: ");
 260     for (i = 0; i < nsig; i++) {
 261         int hash_nid, sign_nid;
 262         unsigned char rhash, rsign;
 263         const char *sstr = NULL;
 264         if (shared)
 265             SSL_get_shared_sigalgs(s, i, &sign_nid, &hash_nid, NULL,
 266                                    &rsign, &rhash);
 267         else
 268             SSL_get_sigalgs(s, i, &sign_nid, &hash_nid, NULL, &rsign, &rhash);
 269         if (i)
 270             BIO_puts(out, ":");
 271         sstr = get_sigtype(sign_nid);
 272         if (sstr)
 273             BIO_printf(out, "%s+", sstr);
 274         else
 275             BIO_printf(out, "0x%02X+", (int)rsign);
 276         if (hash_nid != NID_undef)
 277             BIO_printf(out, "%s", OBJ_nid2sn(hash_nid));
 278         else
 279             BIO_printf(out, "0x%02X", (int)rhash);
 280     }
 281     BIO_puts(out, "\n");
 282     return 1;
 283 }
 284
 285 int ssl_print_sigalgs(BIO *out, SSL *s)
 286 {
 287     int nid;
 288     if (!SSL_is_server(s))
 289         ssl_print_client_cert_types(out, s);
 290     do_print_sigalgs(out, s, 0);
 291     do_print_sigalgs(out, s, 1);
 292     if (SSL_get_peer_signature_nid(s, &nid))
 293         BIO_printf(out, "Peer signing digest: %s\n", OBJ_nid2sn(nid));
 294     if (SSL_get_peer_signature_type_nid(s, &nid))
 295         BIO_printf(out, "Peer signature type: %s\n", get_sigtype(nid));
 296     return 1;
 297 }
 298
 299 #ifndef OPENSSL_NO_EC
 300 int ssl_print_point_formats(BIO *out, SSL *s)
 301 {
 302     int i, nformats;
 303     const char *pformats;
 304     nformats = SSL_get0_ec_point_formats(s, &pformats);
 305     if (nformats <= 0)
 306         return 1;
 307     BIO_puts(out, "Supported Elliptic Curve Point Formats: ");
 308     for (i = 0; i < nformats; i++, pformats++) {
 309         if (i)
 310             BIO_puts(out, ":");
 311         switch (*pformats) {
 312         case TLSEXT_ECPOINTFORMAT_uncompressed:
 313             BIO_puts(out, "uncompressed");
 314             break;
 315
 316         case TLSEXT_ECPOINTFORMAT_ansiX962_compressed_prime:
 317             BIO_puts(out, "ansiX962_compressed_prime");
 318             break;
 319
 320         case TLSEXT_ECPOINTFORMAT_ansiX962_compressed_char2:
 321             BIO_puts(out, "ansiX962_compressed_char2");
 322             break;
 323
 324         default:
 325             BIO_printf(out, "unknown(%d)", (int)*pformats);
 326             break;
 327
 328         }
 329     }
 330     BIO_puts(out, "\n");
 331     return 1;
 332 }
 333
 334 int ssl_print_groups(BIO *out, SSL *s, int noshared)
 335 {
 336     int i, ngroups, *groups, nid;
 337     const char *gname;
 338
 339     ngroups = SSL_get1_groups(s, NULL);
 340     if (ngroups <= 0)
 341         return 1;
 342     groups = app_malloc(ngroups * sizeof(int), "groups to print");
 343     SSL_get1_groups(s, groups);
 344
 345     BIO_puts(out, "Supported Elliptic Groups: ");
 346     for (i = 0; i < ngroups; i++) {
 347         if (i)
 348             BIO_puts(out, ":");
 349         nid = groups[i];
 350         /* If unrecognised print out hex version */
 351         if (nid & TLSEXT_nid_unknown)
 352             BIO_printf(out, "0x%04X", nid & 0xFFFF);
 353         else {
 354             /* TODO(TLS1.3): Get group name here */
 355             /* Use NIST name for curve if it exists */
 356             gname = EC_curve_nid2nist(nid);
 357             if (!gname)
 358                 gname = OBJ_nid2sn(nid);
 359             BIO_printf(out, "%s", gname);
 360         }
 361     }
 362     OPENSSL_free(groups);
 363     if (noshared) {
 364         BIO_puts(out, "\n");
 365         return 1;
 366     }
 367     BIO_puts(out, "\nShared Elliptic groups: ");
 368     ngroups = SSL_get_shared_group(s, -1);
 369     for (i = 0; i < ngroups; i++) {
 370         if (i)
 371             BIO_puts(out, ":");
 372         nid = SSL_get_shared_group(s, i);
 373         /* TODO(TLS1.3): Convert for DH groups */
 374         gname = EC_curve_nid2nist(nid);
 375         if (!gname)
 376             gname = OBJ_nid2sn(nid);
 377         BIO_printf(out, "%s", gname);
 378     }
 379     if (ngroups == 0)
 380         BIO_puts(out, "NONE");
 381     BIO_puts(out, "\n");
 382     return 1;
 383 }
 384 #endif
 385 int ssl_print_tmp_key(BIO *out, SSL *s)
 386 {
 387     EVP_PKEY *key;
 388     if (!SSL_get_server_tmp_key(s, &key))
 389         return 1;
 390     BIO_puts(out, "Server Temp Key: ");
 391     switch (EVP_PKEY_id(key)) {
 392     case EVP_PKEY_RSA:
 393         BIO_printf(out, "RSA, %d bits\n", EVP_PKEY_bits(key));
 394         break;
 395
 396     case EVP_PKEY_DH:
 397         BIO_printf(out, "DH, %d bits\n", EVP_PKEY_bits(key));
 398         break;
 399 #ifndef OPENSSL_NO_EC
 400     case EVP_PKEY_EC:
 401         {
 402             EC_KEY *ec = EVP_PKEY_get1_EC_KEY(key);
 403             int nid;
 404             const char *cname;
 405             nid = EC_GROUP_get_curve_name(EC_KEY_get0_group(ec));
 406             EC_KEY_free(ec);
 407             cname = EC_curve_nid2nist(nid);
 408             if (!cname)
 409                 cname = OBJ_nid2sn(nid);
 410             BIO_printf(out, "ECDH, %s, %d bits\n", cname, EVP_PKEY_bits(key));
 411         }
 412     break;
 413 #endif
 414     default:
 415         BIO_printf(out, "%s, %d bits\n", OBJ_nid2sn(EVP_PKEY_id(key)),
 416                    EVP_PKEY_bits(key));
 417     }
 418     EVP_PKEY_free(key);
 419     return 1;
 420 }
 421
 422 long bio_dump_callback(BIO *bio, int cmd, const char *argp,
 423                        int argi, long argl, long ret)
 424 {
 425     BIO *out;
 426
 427     out = (BIO *)BIO_get_callback_arg(bio);
 428     if (out == NULL)
 429         return (ret);
 430
 431     if (cmd == (BIO_CB_READ | BIO_CB_RETURN)) {
 432         BIO_printf(out, "read from %p [%p] (%lu bytes => %ld (0x%lX))\n",
 433                    (void *)bio, (void *)argp, (unsigned long)argi, ret, ret);
 434         BIO_dump(out, argp, (int)ret);
 435         return (ret);
 436     } else if (cmd == (BIO_CB_WRITE | BIO_CB_RETURN)) {
 437         BIO_printf(out, "write to %p [%p] (%lu bytes => %ld (0x%lX))\n",
 438                    (void *)bio, (void *)argp, (unsigned long)argi, ret, ret);
 439         BIO_dump(out, argp, (int)ret);
 440     }
 441     return (ret);
 442 }
 443
 444 void apps_ssl_info_callback(const SSL *s, int where, int ret)
 445 {
 446     const char *str;
 447     int w;
 448
 449     w = where & ~SSL_ST_MASK;
 450
 451     if (w & SSL_ST_CONNECT)
 452         str = "SSL_connect";
 453     else if (w & SSL_ST_ACCEPT)
 454         str = "SSL_accept";
 455     else
 456         str = "undefined";
 457
 458     if (where & SSL_CB_LOOP) {
 459         BIO_printf(bio_err, "%s:%s\n", str, SSL_state_string_long(s));
 460     } else if (where & SSL_CB_ALERT) {
 461         str = (where & SSL_CB_READ) ? "read" : "write";
 462         BIO_printf(bio_err, "SSL3 alert %s:%s:%s\n",
 463                    str,
 464                    SSL_alert_type_string_long(ret),
 465                    SSL_alert_desc_string_long(ret));
 466     } else if (where & SSL_CB_EXIT) {
 467         if (ret == 0)
 468             BIO_printf(bio_err, "%s:failed in %s\n",
 469                        str, SSL_state_string_long(s));
 470         else if (ret < 0) {
 471             BIO_printf(bio_err, "%s:error in %s\n",
 472                        str, SSL_state_string_long(s));
 473         }
 474     }
 475 }
 476
 477 static STRINT_PAIR ssl_versions[] = {
 478     {"SSL 3.0", SSL3_VERSION},
 479     {"TLS 1.0", TLS1_VERSION},
 480     {"TLS 1.1", TLS1_1_VERSION},
 481     {"TLS 1.2", TLS1_2_VERSION},
 482     {"TLS 1.3", TLS1_3_VERSION},
 483     {"DTLS 1.0", DTLS1_VERSION},
 484     {"DTLS 1.0 (bad)", DTLS1_BAD_VER},
 485     {NULL}
 486 };
 487 static STRINT_PAIR alert_types[] = {
 488     {" close_notify", 0},
 489     {" end_of_early_data", 1},
 490     {" unexpected_message", 10},
 491     {" bad_record_mac", 20},
 492     {" decryption_failed", 21},
 493     {" record_overflow", 22},
 494     {" decompression_failure", 30},
 495     {" handshake_failure", 40},
 496     {" bad_certificate", 42},
 497     {" unsupported_certificate", 43},
 498     {" certificate_revoked", 44},
 499     {" certificate_expired", 45},
 500     {" certificate_unknown", 46},
 501     {" illegal_parameter", 47},
 502     {" unknown_ca", 48},
 503     {" access_denied", 49},
 504     {" decode_error", 50},
 505     {" decrypt_error", 51},
 506     {" export_restriction", 60},
 507     {" protocol_version", 70},
 508     {" insufficient_security", 71},
 509     {" internal_error", 80},
 510     {" inappropriate_fallback", 86},
 511     {" user_canceled", 90},
 512     {" no_renegotiation", 100},
 513     {" missing_extension", 109},
 514     {" unsupported_extension", 110},
 515     {" certificate_unobtainable", 111},
 516     {" unrecognized_name", 112},
 517     {" bad_certificate_status_response", 113},
 518     {" bad_certificate_hash_value", 114},
 519     {" unknown_psk_identity", 115},
 520     {" certificate_required", 116},
 521     {NULL}
 522 };
 523
 524 static STRINT_PAIR handshakes[] = {
 525     {", HelloRequest", SSL3_MT_HELLO_REQUEST},
 526     {", ClientHello", SSL3_MT_CLIENT_HELLO},
 527     {", ServerHello", SSL3_MT_SERVER_HELLO},
 528     {", HelloVerifyRequest", DTLS1_MT_HELLO_VERIFY_REQUEST},
 529     {", NewSessionTicket", SSL3_MT_NEWSESSION_TICKET},
 530     {", EndOfEarlyData", SSL3_MT_END_OF_EARLY_DATA},
 531     {", HelloRetryRequest", SSL3_MT_HELLO_RETRY_REQUEST},
 532     {", EncryptedExtensions", SSL3_MT_ENCRYPTED_EXTENSIONS},
 533     {", Certificate", SSL3_MT_CERTIFICATE},
 534     {", ServerKeyExchange", SSL3_MT_SERVER_KEY_EXCHANGE},
 535     {", CertificateRequest", SSL3_MT_CERTIFICATE_REQUEST},
 536     {", ServerHelloDone", SSL3_MT_SERVER_DONE},
 537     {", CertificateVerify", SSL3_MT_CERTIFICATE_VERIFY},
 538     {", ClientKeyExchange", SSL3_MT_CLIENT_KEY_EXCHANGE},
 539     {", Finished", SSL3_MT_FINISHED},
 540     {", CertificateUrl", 21},
 541     {", CertificateStatus", SSL3_MT_CERTIFICATE_STATUS},
 542     {", SupplementalData", 23},
 543     {", KeyUpdate", SSL3_MT_KEY_UPDATE},
 544 #ifndef OPENSSL_NO_NEXTPROTONEG
 545     {", NextProto", SSL3_MT_NEXT_PROTO},
 546 #endif
 547     {", MessageHash", SSL3_MT_MESSAGE_HASH},
 548     {NULL}
 549 };
 550
 551 void msg_cb(int write_p, int version, int content_type, const void *buf,
 552             size_t len, SSL *ssl, void *arg)
 553 {
 554     BIO *bio = arg;
 555     const char *str_write_p = write_p ? ">>>" : "<<<";
 556     const char *str_version = lookup(version, ssl_versions, "???");
 557     const char *str_content_type = "", *str_details1 = "", *str_details2 = "";
 558     const unsigned char* bp = buf;
 559
 560     if (version == SSL3_VERSION ||
 561         version == TLS1_VERSION ||
 562         version == TLS1_1_VERSION ||
 563         version == TLS1_2_VERSION ||
 564         version == TLS1_3_VERSION ||
 565         version == DTLS1_VERSION || version == DTLS1_BAD_VER) {
 566         switch (content_type) {
 567         case 20:
 568             str_content_type = ", ChangeCipherSpec";
 569             break;
 570         case 21:
 571             str_content_type = ", Alert";
 572             str_details1 = ", ???";
 573             if (len == 2) {
 574                 switch (bp[0]) {
 575                 case 1:
 576                     str_details1 = ", warning";
 577                     break;
 578                 case 2:
 579                     str_details1 = ", fatal";
 580                     break;
 581                 }
 582                 str_details2 = lookup((int)bp[1], alert_types, " ???");
 583             }
 584             break;
 585         case 22:
 586             str_content_type = ", Handshake";
 587             str_details1 = "???";
 588             if (len > 0)
 589                 str_details1 = lookup((int)bp[0], handshakes, "???");
 590             break;
 591         case 23:
 592             str_content_type = ", ApplicationData";
 593             break;
 594 #ifndef OPENSSL_NO_HEARTBEATS
 595         case 24:
 596             str_details1 = ", Heartbeat";
 597
 598             if (len > 0) {
 599                 switch (bp[0]) {
 600                 case 1:
 601                     str_details1 = ", HeartbeatRequest";
 602                     break;
 603                 case 2:
 604                     str_details1 = ", HeartbeatResponse";
 605                     break;
 606                 }
 607             }
 608             break;
 609 #endif
 610         }
 611     }
 612
 613     BIO_printf(bio, "%s %s%s [length %04lx]%s%s\n", str_write_p, str_version,
 614                str_content_type, (unsigned long)len, str_details1,
 615                str_details2);
 616
 617     if (len > 0) {
 618         size_t num, i;
 619
 620         BIO_printf(bio, "   ");
 621         num = len;
 622         for (i = 0; i < num; i++) {
 623             if (i % 16 == 0 && i > 0)
 624                 BIO_printf(bio, "\n   ");
 625             BIO_printf(bio, " %02x", ((const unsigned char *)buf)[i]);
 626         }
 627         if (i < len)
 628             BIO_printf(bio, " ...");
 629         BIO_printf(bio, "\n");
 630     }
 631     (void)BIO_flush(bio);
 632 }
 633
 634 static STRINT_PAIR tlsext_types[] = {
 635     {"server name", TLSEXT_TYPE_server_name},
 636     {"max fragment length", TLSEXT_TYPE_max_fragment_length},
 637     {"client certificate URL", TLSEXT_TYPE_client_certificate_url},
 638     {"trusted CA keys", TLSEXT_TYPE_trusted_ca_keys},
 639     {"truncated HMAC", TLSEXT_TYPE_truncated_hmac},
 640     {"status request", TLSEXT_TYPE_status_request},
 641     {"user mapping", TLSEXT_TYPE_user_mapping},
 642     {"client authz", TLSEXT_TYPE_client_authz},
 643     {"server authz", TLSEXT_TYPE_server_authz},
 644     {"cert type", TLSEXT_TYPE_cert_type},
 645     {"supported_groups", TLSEXT_TYPE_supported_groups},
 646     {"EC point formats", TLSEXT_TYPE_ec_point_formats},
 647     {"SRP", TLSEXT_TYPE_srp},
 648     {"signature algorithms", TLSEXT_TYPE_signature_algorithms},
 649     {"use SRTP", TLSEXT_TYPE_use_srtp},
 650     {"heartbeat", TLSEXT_TYPE_heartbeat},
 651     {"session ticket", TLSEXT_TYPE_session_ticket},
 652     {"renegotiation info", TLSEXT_TYPE_renegotiate},
 653     {"signed certificate timestamps", TLSEXT_TYPE_signed_certificate_timestamp},
 654     {"TLS padding", TLSEXT_TYPE_padding},
 655 #ifdef TLSEXT_TYPE_next_proto_neg
 656     {"next protocol", TLSEXT_TYPE_next_proto_neg},
 657 #endif
 658 #ifdef TLSEXT_TYPE_encrypt_then_mac
 659     {"encrypt-then-mac", TLSEXT_TYPE_encrypt_then_mac},
 660 #endif
 661 #ifdef TLSEXT_TYPE_application_layer_protocol_negotiation
 662     {"application layer protocol negotiation",
 663      TLSEXT_TYPE_application_layer_protocol_negotiation},
 664 #endif
 665 #ifdef TLSEXT_TYPE_extended_master_secret
 666     {"extended master secret", TLSEXT_TYPE_extended_master_secret},
 667 #endif
 668     {NULL}
 669 };
 670
 671 void tlsext_cb(SSL *s, int client_server, int type,
 672                const unsigned char *data, int len, void *arg)
 673 {
 674     BIO *bio = arg;
 675     const char *extname = lookup(type, tlsext_types, "unknown");
 676
 677     BIO_printf(bio, "TLS %s extension \"%s\" (id=%d), len=%d\n",
 678                client_server ? "server" : "client", extname, type, len);
 679     BIO_dump(bio, (const char *)data, len);
 680     (void)BIO_flush(bio);
 681 }
 682
 683 #ifndef OPENSSL_NO_SOCK
 684 int generate_cookie_callback(SSL *ssl, unsigned char *cookie,
 685                              unsigned int *cookie_len)
 686 {
 687     unsigned char *buffer;
 688     size_t length;
 689     unsigned short port;
 690     BIO_ADDR *peer = NULL;
 691
 692     /* Initialize a random secret */
 693     if (!cookie_initialized) {
 694         if (RAND_bytes(cookie_secret, COOKIE_SECRET_LENGTH) <= 0) {
 695             BIO_printf(bio_err, "error setting random cookie secret\n");
 696             return 0;
 697         }
 698         cookie_initialized = 1;
 699     }
 700
 701     peer = BIO_ADDR_new();
 702     if (peer == NULL) {
 703         BIO_printf(bio_err, "memory full\n");
 704         return 0;
 705     }
 706
 707     /* Read peer information */
 708     (void)BIO_dgram_get_peer(SSL_get_rbio(ssl), peer);
 709
 710     /* Create buffer with peer's address and port */
 711     BIO_ADDR_rawaddress(peer, NULL, &length);
 712     OPENSSL_assert(length != 0);
 713     port = BIO_ADDR_rawport(peer);
 714     length += sizeof(port);
 715     buffer = app_malloc(length, "cookie generate buffer");
 716
 717     memcpy(buffer, &port, sizeof(port));
 718     BIO_ADDR_rawaddress(peer, buffer + sizeof(port), NULL);
 719
 720     /* Calculate HMAC of buffer using the secret */
 721     HMAC(EVP_sha1(), cookie_secret, COOKIE_SECRET_LENGTH,
 722          buffer, length, cookie, cookie_len);
 723
 724     OPENSSL_free(buffer);
 725     BIO_ADDR_free(peer);
 726
 727     return 1;
 728 }
 729
 730 int verify_cookie_callback(SSL *ssl, const unsigned char *cookie,
 731                            unsigned int cookie_len)
 732 {
 733     unsigned char result[EVP_MAX_MD_SIZE];
 734     unsigned int resultlength;
 735
 736     /* Note: we check cookie_initialized because if it's not,
 737      * it cannot be valid */
 738     if (cookie_initialized
 739         && generate_cookie_callback(ssl, result, &resultlength)
 740         && cookie_len == resultlength
 741         && memcmp(result, cookie, resultlength) == 0)
 742         return 1;
 743
 744     return 0;
 745 }
 746 #endif
 747
 748 /*
 749  * Example of extended certificate handling. Where the standard support of
 750  * one certificate per algorithm is not sufficient an application can decide
 751  * which certificate(s) to use at runtime based on whatever criteria it deems
 752  * appropriate.
 753  */
 754
 755 /* Linked list of certificates, keys and chains */
 756 struct ssl_excert_st {
 757     int certform;
 758     const char *certfile;
 759     int keyform;
 760     const char *keyfile;
 761     const char *chainfile;
 762     X509 *cert;
 763     EVP_PKEY *key;
 764     STACK_OF(X509) *chain;
 765     int build_chain;
 766     struct ssl_excert_st *next, *prev;
 767 };
 768
 769 static STRINT_PAIR chain_flags[] = {
 770     {"Overall Validity", CERT_PKEY_VALID},
 771     {"Sign with EE key", CERT_PKEY_SIGN},
 772     {"EE signature", CERT_PKEY_EE_SIGNATURE},
 773     {"CA signature", CERT_PKEY_CA_SIGNATURE},
 774     {"EE key parameters", CERT_PKEY_EE_PARAM},
 775     {"CA key parameters", CERT_PKEY_CA_PARAM},
 776     {"Explicitly sign with EE key", CERT_PKEY_EXPLICIT_SIGN},
 777     {"Issuer Name", CERT_PKEY_ISSUER_NAME},
 778     {"Certificate Type", CERT_PKEY_CERT_TYPE},
 779     {NULL}
 780 };
 781
 782 static void print_chain_flags(SSL *s, int flags)
 783 {
 784     STRINT_PAIR *pp;
 785
 786     for (pp = chain_flags; pp->name; ++pp)
 787         BIO_printf(bio_err, "\t%s: %s\n",
 788                    pp->name,
 789                    (flags & pp->retval) ? "OK" : "NOT OK");
 790     BIO_printf(bio_err, "\tSuite B: ");
 791     if (SSL_set_cert_flags(s, 0) & SSL_CERT_FLAG_SUITEB_128_LOS)
 792         BIO_puts(bio_err, flags & CERT_PKEY_SUITEB ? "OK\n" : "NOT OK\n");
 793     else
 794         BIO_printf(bio_err, "not tested\n");
 795 }
 796
 797 /*
 798  * Very basic selection callback: just use any certificate chain reported as
 799  * valid. More sophisticated could prioritise according to local policy.
 800  */
 801 static int set_cert_cb(SSL *ssl, void *arg)
 802 {
 803     int i, rv;
 804     SSL_EXCERT *exc = arg;
 805 #ifdef CERT_CB_TEST_RETRY
 806     static int retry_cnt;
 807     if (retry_cnt < 5) {
 808         retry_cnt++;
 809         BIO_printf(bio_err,
 810                    "Certificate callback retry test: count %d\n",
 811                    retry_cnt);
 812         return -1;
 813     }
 814 #endif
 815     SSL_certs_clear(ssl);
 816
 817     if (!exc)
 818         return 1;
 819
 820     /*
 821      * Go to end of list and traverse backwards since we prepend newer
 822      * entries this retains the original order.
 823      */
 824     while (exc->next)
 825         exc = exc->next;
 826
 827     i = 0;
 828
 829     while (exc) {
 830         i++;
 831         rv = SSL_check_chain(ssl, exc->cert, exc->key, exc->chain);
 832         BIO_printf(bio_err, "Checking cert chain %d:\nSubject: ", i);
 833         X509_NAME_print_ex(bio_err, X509_get_subject_name(exc->cert), 0,
 834                            nmflag);
 835         BIO_puts(bio_err, "\n");
 836         print_chain_flags(ssl, rv);
 837         if (rv & CERT_PKEY_VALID) {
 838             if (!SSL_use_certificate(ssl, exc->cert)
 839                     || !SSL_use_PrivateKey(ssl, exc->key)) {
 840                 return 0;
 841             }
 842             /*
 843              * NB: we wouldn't normally do this as it is not efficient
 844              * building chains on each connection better to cache the chain
 845              * in advance.
 846              */
 847             if (exc->build_chain) {
 848                 if (!SSL_build_cert_chain(ssl, 0))
 849                     return 0;
 850             } else if (exc->chain)
 851                 SSL_set1_chain(ssl, exc->chain);
 852         }
 853         exc = exc->prev;
 854     }
 855     return 1;
 856 }
 857
 858 void ssl_ctx_set_excert(SSL_CTX *ctx, SSL_EXCERT *exc)
 859 {
 860     SSL_CTX_set_cert_cb(ctx, set_cert_cb, exc);
 861 }
 862
 863 static int ssl_excert_prepend(SSL_EXCERT **pexc)
 864 {
 865     SSL_EXCERT *exc = app_malloc(sizeof(*exc), "prepend cert");
 866
 867     memset(exc, 0, sizeof(*exc));
 868
 869     exc->next = *pexc;
 870     *pexc = exc;
 871
 872     if (exc->next) {
 873         exc->certform = exc->next->certform;
 874         exc->keyform = exc->next->keyform;
 875         exc->next->prev = exc;
 876     } else {
 877         exc->certform = FORMAT_PEM;
 878         exc->keyform = FORMAT_PEM;
 879     }
 880     return 1;
 881
 882 }
 883
 884 void ssl_excert_free(SSL_EXCERT *exc)
 885 {
 886     SSL_EXCERT *curr;
 887
 888     if (!exc)
 889         return;
 890     while (exc) {
 891         X509_free(exc->cert);
 892         EVP_PKEY_free(exc->key);
 893         sk_X509_pop_free(exc->chain, X509_free);
 894         curr = exc;
 895         exc = exc->next;
 896         OPENSSL_free(curr);
 897     }
 898 }
 899
 900 int load_excert(SSL_EXCERT **pexc)
 901 {
 902     SSL_EXCERT *exc = *pexc;
 903     if (!exc)
 904         return 1;
 905     /* If nothing in list, free and set to NULL */
 906     if (!exc->certfile && !exc->next) {
 907         ssl_excert_free(exc);
 908         *pexc = NULL;
 909         return 1;
 910     }
 911     for (; exc; exc = exc->next) {
 912         if (!exc->certfile) {
 913             BIO_printf(bio_err, "Missing filename\n");
 914             return 0;
 915         }
 916         exc->cert = load_cert(exc->certfile, exc->certform,
 917                               "Server Certificate");
 918         if (!exc->cert)
 919             return 0;
 920         if (exc->keyfile) {
 921             exc->key = load_key(exc->keyfile, exc->keyform,
 922                                 0, NULL, NULL, "Server Key");
 923         } else {
 924             exc->key = load_key(exc->certfile, exc->certform,
 925                                 0, NULL, NULL, "Server Key");
 926         }
 927         if (!exc->key)
 928             return 0;
 929         if (exc->chainfile) {
 930             if (!load_certs(exc->chainfile, &exc->chain, FORMAT_PEM, NULL,
 931                             "Server Chain"))
 932                 return 0;
 933         }
 934     }
 935     return 1;
 936 }
 937
 938 enum range { OPT_X_ENUM };
 939
 940 int args_excert(int opt, SSL_EXCERT **pexc)
 941 {
 942     SSL_EXCERT *exc = *pexc;
 943
 944     assert(opt > OPT_X__FIRST);
 945     assert(opt < OPT_X__LAST);
 946
 947     if (exc == NULL) {
 948         if (!ssl_excert_prepend(&exc)) {
 949             BIO_printf(bio_err, " %s: Error initialising xcert\n",
 950                        opt_getprog());
 951             goto err;
 952         }
 953         *pexc = exc;
 954     }
 955
 956     switch ((enum range)opt) {
 957     case OPT_X__FIRST:
 958     case OPT_X__LAST:
 959         return 0;
 960     case OPT_X_CERT:
 961         if (exc->certfile && !ssl_excert_prepend(&exc)) {
 962             BIO_printf(bio_err, "%s: Error adding xcert\n", opt_getprog());
 963             goto err;
 964         }
 965         *pexc = exc;
 966         exc->certfile = opt_arg();
 967         break;
 968     case OPT_X_KEY:
 969         if (exc->keyfile) {
 970             BIO_printf(bio_err, "%s: Key already specified\n", opt_getprog());
 971             goto err;
 972         }
 973         exc->keyfile = opt_arg();
 974         break;
 975     case OPT_X_CHAIN:
 976         if (exc->chainfile) {
 977             BIO_printf(bio_err, "%s: Chain already specified\n",
 978                        opt_getprog());
 979             goto err;
 980         }
 981         exc->chainfile = opt_arg();
 982         break;
 983     case OPT_X_CHAIN_BUILD:
 984         exc->build_chain = 1;
 985         break;
 986     case OPT_X_CERTFORM:
 987         if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &exc->certform))
 988             return 0;
 989         break;
 990     case OPT_X_KEYFORM:
 991         if (!opt_format(opt_arg(), OPT_FMT_PEMDER, &exc->keyform))
 992             return 0;
 993         break;
 994     }
 995     return 1;
 996
 997  err:
 998     ERR_print_errors(bio_err);
 999     ssl_excert_free(exc);
1000     *pexc = NULL;
1001     return 0;
1002 }
1003
1004 static void print_raw_cipherlist(SSL *s)
1005 {
1006     const unsigned char *rlist;
1007     static const unsigned char scsv_id[] = { 0, 0xFF };
1008     size_t i, rlistlen, num;
1009     if (!SSL_is_server(s))
1010         return;
1011     num = SSL_get0_raw_cipherlist(s, NULL);
1012     OPENSSL_assert(num == 2);
1013     rlistlen = SSL_get0_raw_cipherlist(s, &rlist);
1014     BIO_puts(bio_err, "Client cipher list: ");
1015     for (i = 0; i < rlistlen; i += num, rlist += num) {
1016         const SSL_CIPHER *c = SSL_CIPHER_find(s, rlist);
1017         if (i)
1018             BIO_puts(bio_err, ":");
1019         if (c)
1020             BIO_puts(bio_err, SSL_CIPHER_get_name(c));
1021         else if (!memcmp(rlist, scsv_id, num))
1022             BIO_puts(bio_err, "SCSV");
1023         else {
1024             size_t j;
1025             BIO_puts(bio_err, "0x");
1026             for (j = 0; j < num; j++)
1027                 BIO_printf(bio_err, "%02X", rlist[j]);
1028         }
1029     }
1030     BIO_puts(bio_err, "\n");
1031 }
1032
1033 /*
1034  * Hex encoder for TLSA RRdata, not ':' delimited.
1035  */
1036 static char *hexencode(const unsigned char *data, size_t len)
1037 {
1038     static const char *hex = "0123456789abcdef";
1039     char *out;
1040     char *cp;
1041     size_t outlen = 2 * len + 1;
1042     int ilen = (int) outlen;
1043
1044     if (outlen < len || ilen < 0 || outlen != (size_t)ilen) {
1045         BIO_printf(bio_err, "%s: %zu-byte buffer too large to hexencode\n",
1046                    opt_getprog(), len);
1047         exit(1);
1048     }
1049     cp = out = app_malloc(ilen, "TLSA hex data buffer");
1050
1051     while (len-- > 0) {
1052         *cp++ = hex[(*data >> 4) & 0x0f];
1053         *cp++ = hex[*data++ & 0x0f];
1054     }
1055     *cp = '\0';
1056     return out;
1057 }
1058
1059 void print_verify_detail(SSL *s, BIO *bio)
1060 {
1061     int mdpth;
1062     EVP_PKEY *mspki;
1063     long verify_err = SSL_get_verify_result(s);
1064
1065     if (verify_err == X509_V_OK) {
1066         const char *peername = SSL_get0_peername(s);
1067
1068         BIO_printf(bio, "Verification: OK\n");
1069         if (peername != NULL)
1070             BIO_printf(bio, "Verified peername: %s\n", peername);
1071     } else {
1072         const char *reason = X509_verify_cert_error_string(verify_err);
1073
1074         BIO_printf(bio, "Verification error: %s\n", reason);
1075     }
1076
1077     if ((mdpth = SSL_get0_dane_authority(s, NULL, &mspki)) >= 0) {
1078         uint8_t usage, selector, mtype;
1079         const unsigned char *data = NULL;
1080         size_t dlen = 0;
1081         char *hexdata;
1082
1083         mdpth = SSL_get0_dane_tlsa(s, &usage, &selector, &mtype, &data, &dlen);
1084
1085         /*
1086          * The TLSA data field can be quite long when it is a certificate,
1087          * public key or even a SHA2-512 digest.  Because the initial octets of
1088          * ASN.1 certificates and public keys contain mostly boilerplate OIDs
1089          * and lengths, we show the last 12 bytes of the data instead, as these
1090          * are more likely to distinguish distinct TLSA records.
1091          */
1092 #define TLSA_TAIL_SIZE 12
1093         if (dlen > TLSA_TAIL_SIZE)
1094             hexdata = hexencode(data + dlen - TLSA_TAIL_SIZE, TLSA_TAIL_SIZE);
1095         else
1096             hexdata = hexencode(data, dlen);
1097         BIO_printf(bio, "DANE TLSA %d %d %d %s%s %s at depth %d\n",
1098                    usage, selector, mtype,
1099                    (dlen > TLSA_TAIL_SIZE) ? "..." : "", hexdata,
1100                    (mspki != NULL) ? "signed the certificate" :
1101                    mdpth ? "matched TA certificate" : "matched EE certificate",
1102                    mdpth);
1103         OPENSSL_free(hexdata);
1104     }
1105 }
1106
1107 void print_ssl_summary(SSL *s)
1108 {
1109     const SSL_CIPHER *c;
1110     X509 *peer;
1111
1112     BIO_printf(bio_err, "Protocol version: %s\n", SSL_get_version(s));
1113     print_raw_cipherlist(s);
1114     c = SSL_get_current_cipher(s);
1115     BIO_printf(bio_err, "Ciphersuite: %s\n", SSL_CIPHER_get_name(c));
1116     do_print_sigalgs(bio_err, s, 0);
1117     peer = SSL_get_peer_certificate(s);
1118     if (peer) {
1119         int nid;
1120
1121         BIO_puts(bio_err, "Peer certificate: ");
1122         X509_NAME_print_ex(bio_err, X509_get_subject_name(peer),
1123                            0, nmflag);
1124         BIO_puts(bio_err, "\n");
1125         if (SSL_get_peer_signature_nid(s, &nid))
1126             BIO_printf(bio_err, "Hash used: %s\n", OBJ_nid2sn(nid));
1127         if (SSL_get_peer_signature_type_nid(s, &nid))
1128             BIO_printf(bio_err, "Signature type: %s\n", get_sigtype(nid));
1129         print_verify_detail(s, bio_err);
1130     } else
1131         BIO_puts(bio_err, "No peer certificate\n");
1132     X509_free(peer);
1133 #ifndef OPENSSL_NO_EC
1134     ssl_print_point_formats(bio_err, s);
1135     if (SSL_is_server(s))
1136         ssl_print_groups(bio_err, s, 1);
1137     else
1138         ssl_print_tmp_key(bio_err, s);
1139 #else
1140     if (!SSL_is_server(s))
1141         ssl_print_tmp_key(bio_err, s);
1142 #endif
1143 }
1144
1145 int config_ctx(SSL_CONF_CTX *cctx, STACK_OF(OPENSSL_STRING) *str,
1146                SSL_CTX *ctx)
1147 {
1148     int i;
1149
1150     SSL_CONF_CTX_set_ssl_ctx(cctx, ctx);
1151     for (i = 0; i < sk_OPENSSL_STRING_num(str); i += 2) {
1152         const char *flag = sk_OPENSSL_STRING_value(str, i);
1153         const char *arg = sk_OPENSSL_STRING_value(str, i + 1);
1154         if (SSL_CONF_cmd(cctx, flag, arg) <= 0) {
1155             if (arg)
1156                 BIO_printf(bio_err, "Error with command: \"%s %s\"\n",
1157                            flag, arg);
1158             else
1159                 BIO_printf(bio_err, "Error with command: \"%s\"\n", flag);
1160             ERR_print_errors(bio_err);
1161             return 0;
1162         }
1163     }
1164     if (!SSL_CONF_CTX_finish(cctx)) {
1165         BIO_puts(bio_err, "Error finishing context\n");
1166         ERR_print_errors(bio_err);
1167         return 0;
1168     }
1169     return 1;
1170 }
1171
1172 static int add_crls_store(X509_STORE *st, STACK_OF(X509_CRL) *crls)
1173 {
1174     X509_CRL *crl;
1175     int i;
1176     for (i = 0; i < sk_X509_CRL_num(crls); i++) {
1177         crl = sk_X509_CRL_value(crls, i);
1178         X509_STORE_add_crl(st, crl);
1179     }
1180     return 1;
1181 }
1182
1183 int ssl_ctx_add_crls(SSL_CTX *ctx, STACK_OF(X509_CRL) *crls, int crl_download)
1184 {
1185     X509_STORE *st;
1186     st = SSL_CTX_get_cert_store(ctx);
1187     add_crls_store(st, crls);
1188     if (crl_download)
1189         store_setup_crl_download(st);
1190     return 1;
1191 }
1192
1193 int ssl_load_stores(SSL_CTX *ctx,
1194                     const char *vfyCApath, const char *vfyCAfile,
1195                     const char *chCApath, const char *chCAfile,
1196                     STACK_OF(X509_CRL) *crls, int crl_download)
1197 {
1198     X509_STORE *vfy = NULL, *ch = NULL;
1199     int rv = 0;
1200     if (vfyCApath != NULL || vfyCAfile != NULL) {
1201         vfy = X509_STORE_new();
1202         if (vfy == NULL)
1203             goto err;
1204         if (!X509_STORE_load_locations(vfy, vfyCAfile, vfyCApath))
1205             goto err;
1206         add_crls_store(vfy, crls);
1207         SSL_CTX_set1_verify_cert_store(ctx, vfy);
1208         if (crl_download)
1209             store_setup_crl_download(vfy);
1210     }
1211     if (chCApath != NULL || chCAfile != NULL) {
1212         ch = X509_STORE_new();
1213         if (ch == NULL)
1214             goto err;
1215         if (!X509_STORE_load_locations(ch, chCAfile, chCApath))
1216             goto err;
1217         SSL_CTX_set1_chain_cert_store(ctx, ch);
1218     }
1219     rv = 1;
1220  err:
1221     X509_STORE_free(vfy);
1222     X509_STORE_free(ch);
1223     return rv;
1224 }
1225
1226 /* Verbose print out of security callback */
1227
1228 typedef struct {
1229     BIO *out;
1230     int verbose;
1231     int (*old_cb) (const SSL *s, const SSL_CTX *ctx, int op, int bits, int nid,
1232                    void *other, void *ex);
1233 } security_debug_ex;
1234
1235 static STRINT_PAIR callback_types[] = {
1236     {"Supported Ciphersuite", SSL_SECOP_CIPHER_SUPPORTED},
1237     {"Shared Ciphersuite", SSL_SECOP_CIPHER_SHARED},
1238     {"Check Ciphersuite", SSL_SECOP_CIPHER_CHECK},
1239 #ifndef OPENSSL_NO_DH
1240     {"Temp DH key bits", SSL_SECOP_TMP_DH},
1241 #endif
1242     {"Supported Curve", SSL_SECOP_CURVE_SUPPORTED},
1243     {"Shared Curve", SSL_SECOP_CURVE_SHARED},
1244     {"Check Curve", SSL_SECOP_CURVE_CHECK},
1245     {"Supported Signature Algorithm digest", SSL_SECOP_SIGALG_SUPPORTED},
1246     {"Shared Signature Algorithm digest", SSL_SECOP_SIGALG_SHARED},
1247     {"Check Signature Algorithm digest", SSL_SECOP_SIGALG_CHECK},
1248     {"Signature Algorithm mask", SSL_SECOP_SIGALG_MASK},
1249     {"Certificate chain EE key", SSL_SECOP_EE_KEY},
1250     {"Certificate chain CA key", SSL_SECOP_CA_KEY},
1251     {"Peer Chain EE key", SSL_SECOP_PEER_EE_KEY},
1252     {"Peer Chain CA key", SSL_SECOP_PEER_CA_KEY},
1253     {"Certificate chain CA digest", SSL_SECOP_CA_MD},
1254     {"Peer chain CA digest", SSL_SECOP_PEER_CA_MD},
1255     {"SSL compression", SSL_SECOP_COMPRESSION},
1256     {"Session ticket", SSL_SECOP_TICKET},
1257     {NULL}
1258 };
1259
1260 static int security_callback_debug(const SSL *s, const SSL_CTX *ctx,
1261                                    int op, int bits, int nid,
1262                                    void *other, void *ex)
1263 {
1264     security_debug_ex *sdb = ex;
1265     int rv, show_bits = 1, cert_md = 0;
1266     const char *nm;
1267     rv = sdb->old_cb(s, ctx, op, bits, nid, other, ex);
1268     if (rv == 1 && sdb->verbose < 2)
1269         return 1;
1270     BIO_puts(sdb->out, "Security callback: ");
1271
1272     nm = lookup(op, callback_types, NULL);
1273     switch (op) {
1274     case SSL_SECOP_TICKET:
1275     case SSL_SECOP_COMPRESSION:
1276         show_bits = 0;
1277         nm = NULL;
1278         break;
1279     case SSL_SECOP_VERSION:
1280         BIO_printf(sdb->out, "Version=%s", lookup(nid, ssl_versions, "???"));
1281         show_bits = 0;
1282         nm = NULL;
1283         break;
1284     case SSL_SECOP_CA_MD:
1285     case SSL_SECOP_PEER_CA_MD:
1286         cert_md = 1;
1287         break;
1288     }
1289     if (nm)
1290         BIO_printf(sdb->out, "%s=", nm);
1291
1292     switch (op & SSL_SECOP_OTHER_TYPE) {
1293
1294     case SSL_SECOP_OTHER_CIPHER:
1295         BIO_puts(sdb->out, SSL_CIPHER_get_name(other));
1296         break;
1297
1298 #ifndef OPENSSL_NO_EC
1299     case SSL_SECOP_OTHER_CURVE:
1300         {
1301             const char *cname;
1302             cname = EC_curve_nid2nist(nid);
1303             if (cname == NULL)
1304                 cname = OBJ_nid2sn(nid);
1305             BIO_puts(sdb->out, cname);
1306         }
1307         break;
1308 #endif
1309 #ifndef OPENSSL_NO_DH
1310     case SSL_SECOP_OTHER_DH:
1311         {
1312             DH *dh = other;
1313             BIO_printf(sdb->out, "%d", DH_bits(dh));
1314             break;
1315         }
1316 #endif
1317     case SSL_SECOP_OTHER_CERT:
1318         {
1319             if (cert_md) {
1320                 int sig_nid = X509_get_signature_nid(other);
1321                 BIO_puts(sdb->out, OBJ_nid2sn(sig_nid));
1322             } else {
1323                 EVP_PKEY *pkey = X509_get0_pubkey(other);
1324                 const char *algname = "";
1325                 EVP_PKEY_asn1_get0_info(NULL, NULL, NULL, NULL,
1326                                         &algname, EVP_PKEY_get0_asn1(pkey));
1327                 BIO_printf(sdb->out, "%s, bits=%d",
1328                            algname, EVP_PKEY_bits(pkey));
1329             }
1330             break;
1331         }
1332     case SSL_SECOP_OTHER_SIGALG:
1333         {
1334             const unsigned char *salg = other;
1335             const char *sname = NULL;
1336             switch (salg[1]) {
1337             case TLSEXT_signature_anonymous:
1338                 sname = "anonymous";
1339                 break;
1340             case TLSEXT_signature_rsa:
1341                 sname = "RSA";
1342                 break;
1343             case TLSEXT_signature_dsa:
1344                 sname = "DSA";
1345                 break;
1346             case TLSEXT_signature_ecdsa:
1347                 sname = "ECDSA";
1348                 break;
1349             }
1350
1351             BIO_puts(sdb->out, OBJ_nid2sn(nid));
1352             if (sname)
1353                 BIO_printf(sdb->out, ", algorithm=%s", sname);
1354             else
1355                 BIO_printf(sdb->out, ", algid=%d", salg[1]);
1356             break;
1357         }
1358
1359     }
1360
1361     if (show_bits)
1362         BIO_printf(sdb->out, ", security bits=%d", bits);
1363     BIO_printf(sdb->out, ": %s\n", rv ? "yes" : "no");
1364     return rv;
1365 }
1366
1367 void ssl_ctx_security_debug(SSL_CTX *ctx, int verbose)
1368 {
1369     static security_debug_ex sdb;
1370
1371     sdb.out = bio_err;
1372     sdb.verbose = verbose;
1373     sdb.old_cb = SSL_CTX_get_security_callback(ctx);
1374     SSL_CTX_set_security_callback(ctx, security_callback_debug);
1375     SSL_CTX_set0_security_ex_data(ctx, &sdb);
1376 }
1377
1378 static void keylog_callback(const SSL *ssl, const char *line)
1379 {
1380     if (bio_keylog == NULL) {
1381         BIO_printf(bio_err, "Keylog callback is invoked without valid file!\n");
1382         return;
1383     }
1384
1385     /*
1386      * There might be concurrent writers to the keylog file, so we must ensure
1387      * that the given line is written at once.
1388      */
1389     BIO_printf(bio_keylog, "%s\n", line);
1390     (void)BIO_flush(bio_keylog);
1391 }
1392
1393 int set_keylog_file(SSL_CTX *ctx, const char *keylog_file)
1394 {
1395     /* Close any open files */
1396     BIO_free_all(bio_keylog);
1397     bio_keylog = NULL;
1398
1399     if (ctx == NULL || keylog_file == NULL) {
1400         /* Keylogging is disabled, OK. */
1401         return 0;
1402     }
1403
1404     /*
1405      * Append rather than write in order to allow concurrent modification.
1406      * Furthermore, this preserves existing keylog files which is useful when
1407      * the tool is run multiple times.
1408      */
1409     bio_keylog = BIO_new_file(keylog_file, "a");
1410     if (bio_keylog == NULL) {
1411         BIO_printf(bio_err, "Error writing keylog file %s\n", keylog_file);
1412         return 1;
1413     }
1414
1415     /* Write a header for seekable, empty files (this excludes pipes). */
1416     if (BIO_tell(bio_keylog) == 0) {
1417         BIO_puts(bio_keylog,
1418                  "# SSL/TLS secrets log file, generated by OpenSSL\n");
1419         (void)BIO_flush(bio_keylog);
1420     }
1421     SSL_CTX_set_keylog_callback(ctx, keylog_callback);
1422     return 0;
1423 }