citadel/modules/crypto/serv_crypto.c

   1 // Copyright (c) 1987-2022 by the citadel.org team
   2 //
   3 // This program is open source software; you can redistribute it and/or modify
   4 // it under the terms of the GNU General Public License version 3.
   5 //
   6 // This program is distributed in the hope that it will be useful,
   7 // but WITHOUT ANY WARRANTY; without even the implied warranty of
   8 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   9 // GNU General Public License for more details.
  10
  11 #include <string.h>
  12 #include <unistd.h>
  13 #include <sys/stat.h>
  14 #include <sys/types.h>
  15 #include "sysdep.h"
  16
  17 #ifdef HAVE_OPENSSL
  18 #include <openssl/ssl.h>
  19 #include <openssl/err.h>
  20 #include <openssl/rand.h>
  21 #endif
  22
  23 #include <time.h>
  24
  25 #ifdef HAVE_PTHREAD_H
  26 #include <pthread.h>
  27 #endif
  28
  29 #ifdef HAVE_SYS_SELECT_H
  30 #include <sys/select.h>
  31 #endif
  32
  33 #include <stdio.h>
  34 #include <libcitadel.h>
  35 #include "server.h"
  36 #include "serv_crypto.h"
  37 #include "sysdep_decls.h"
  38 #include "citadel.h"
  39 #include "config.h"
  40 #include "ctdl_module.h"
  41
  42 #ifdef HAVE_OPENSSL
  43 SSL_CTX *ssl_ctx;                               // SSL context for all sessions
  44
  45
  46 // If a private key does not exist, generate one now.
  47 void generate_key(char *keyfilename) {
  48         int ret = 0;
  49         RSA *rsa = NULL;
  50         BIGNUM *bne = NULL;
  51         int bits = 2048;
  52         unsigned long e = RSA_F4;
  53         FILE *fp;
  54
  55         if (access(keyfilename, R_OK) == 0) {   // Already have one.
  56                 return;
  57         }
  58
  59         syslog(LOG_INFO, "crypto: generating RSA key pair");
  60
  61         // generate rsa key
  62         bne = BN_new();
  63         ret = BN_set_word(bne,e);
  64         if (ret != 1) {
  65                 goto free_all;
  66         }
  67
  68         rsa = RSA_new();
  69         ret = RSA_generate_key_ex(rsa, bits, bne, NULL);
  70         if (ret != 1) {
  71                 goto free_all;
  72         }
  73
  74         // write the key file
  75         fp = fopen(keyfilename, "w");
  76         if (fp != NULL) {
  77                 chmod(keyfilename, 0600);
  78                 if (PEM_write_RSAPrivateKey(fp, // the file
  79                                         rsa,    // the key
  80                                         NULL,   // no enc
  81                                         NULL,   // no passphrase
  82                                         0,      // no passphrase
  83                                         NULL,   // no callback
  84                                         NULL    // no callback
  85                 ) != 1) {
  86                         syslog(LOG_ERR, "crypto: cannot write key: %s", ERR_reason_error_string(ERR_get_error()));
  87                         unlink(keyfilename);
  88                 }
  89                 fclose(fp);
  90         }
  91
  92         // free the memory we used
  93 free_all:
  94         RSA_free(rsa);
  95         BN_free(bne);
  96 }
  97
  98
  99 // If a certificate does not exist, generate a self-signed one now.
 100 void generate_certificate(char *keyfilename, char *certfilename) {
 101         RSA *private_key = NULL;
 102         EVP_PKEY *public_key = NULL;
 103         X509_REQ *certificate_signing_request = NULL;
 104         X509_NAME *name = NULL;
 105         X509 *certificate = NULL;
 106         FILE *fp;
 107
 108         if (access(certfilename, R_OK) == 0) {                  // already have one.
 109                 return;
 110         }
 111
 112         syslog(LOG_INFO, "crypto: generating a self-signed certificate");
 113
 114         // Read in our private key.
 115         fp = fopen(keyfilename, "r");
 116         if (fp) {
 117                 private_key = PEM_read_RSAPrivateKey(fp, NULL, NULL, NULL);
 118                 fclose(fp);
 119         }
 120
 121         if (!private_key) {
 122                 syslog(LOG_ERR, "crypto: cannot read the private key");
 123                 return;
 124         }
 125
 126         // Create a public key from the private key
 127         public_key = EVP_PKEY_new();
 128         if (!public_key) {
 129                 syslog(LOG_ERR, "crypto: cannot allocate public key");
 130                 RSA_free(private_key);
 131                 return;
 132         }
 133         EVP_PKEY_assign_RSA(public_key, private_key);
 134
 135         // Create a certificate signing request
 136         certificate_signing_request = X509_REQ_new();
 137         if (!certificate_signing_request) {
 138                 syslog(LOG_ERR, "crypto: cannot allocate certificate signing request");
 139                 RSA_free(private_key);
 140                 EVP_PKEY_free(public_key);
 141                 return;
 142         }
 143
 144         // Assign the public key to the certificate signing request
 145         X509_REQ_set_pubkey(certificate_signing_request, public_key);
 146         X509_REQ_set_version(certificate_signing_request, 0L);
 147
 148         // Tell it who we are
 149         name = X509_REQ_get_subject_name(certificate_signing_request);
 150         X509_NAME_add_entry_by_txt(name, "C", MBSTRING_ASC, (unsigned const char *)"ZZ", -1, -1, 0);
 151         X509_NAME_add_entry_by_txt(name, "ST", MBSTRING_ASC, (unsigned const char *)"The World", -1, -1, 0);
 152         X509_NAME_add_entry_by_txt(name, "L", MBSTRING_ASC, (unsigned const char *)"My Location", -1, -1, 0);
 153         X509_NAME_add_entry_by_txt(name, "O", MBSTRING_ASC, (unsigned const char *)"Generic certificate", -1, -1, 0);
 154         X509_NAME_add_entry_by_txt(name, "OU", MBSTRING_ASC, (unsigned const char *)"Citadel server", -1, -1, 0);
 155         X509_NAME_add_entry_by_txt(name, "CN", MBSTRING_ASC, (unsigned const char *)"*", -1, -1, 0);
 156         X509_REQ_set_subject_name(certificate_signing_request, name);
 157
 158         // Sign the CSR
 159         if (!X509_REQ_sign(certificate_signing_request, public_key, EVP_md5())) {
 160                 syslog(LOG_ERR, "crypto: X509_REQ_sign(): error");
 161                 X509_REQ_free(certificate_signing_request);
 162                 RSA_free(private_key);
 163                 EVP_PKEY_free(public_key);
 164                 return;
 165         }
 166
 167         // Generate the self-signed certificate
 168         certificate = X509_new();
 169         if (!certificate) {
 170                 syslog(LOG_ERR, "crypto: cannot allocate X.509 certificate");
 171                 X509_REQ_free(certificate_signing_request);
 172                 RSA_free(private_key);
 173                 EVP_PKEY_free(public_key);
 174                 return;
 175         }
 176
 177         ASN1_INTEGER_set(X509_get_serialNumber(certificate), 0);
 178         X509_set_issuer_name(certificate, X509_REQ_get_subject_name(certificate_signing_request));
 179         X509_set_subject_name(certificate, X509_REQ_get_subject_name(certificate_signing_request));
 180         X509_gmtime_adj(X509_get_notBefore(certificate), 0);
 181         X509_gmtime_adj(X509_get_notAfter(certificate), (long)60*60*24*SIGN_DAYS);
 182         X509_set_pubkey(certificate, public_key);
 183         X509_REQ_free(certificate_signing_request);             // We're done with the CSR; free it
 184
 185         // Finally, sign the certificate with our private key.
 186         if (!X509_sign(certificate, public_key, EVP_md5())) {
 187                 syslog(LOG_ERR, "crypto: X509_sign() error");
 188                 X509_free(certificate);
 189                 RSA_free(private_key);
 190                 EVP_PKEY_free(public_key);
 191                 return;
 192         }
 193
 194         // Write the certificate to disk
 195         fp = fopen(certfilename, "w");
 196         if (fp != NULL) {
 197                 chmod(certfilename, 0600);
 198                 PEM_write_X509(fp, certificate);
 199                 fclose(fp);
 200         }
 201         else {
 202                 syslog(LOG_ERR, "crypto: %s: %m", certfilename);
 203         }
 204
 205         X509_free(certificate);
 206         EVP_PKEY_free(public_key);
 207         // RSA_free(private_key);                               // private_key is freed by EVP_PKEY_free() above
 208 }
 209
 210
 211 // Set the private key and certificate chain for the global SSL Context.
 212 // This is called during initialization, and can be called again later if the certificate changes.
 213 void bind_to_key_and_certificate(void) {
 214
 215         syslog(LOG_DEBUG, "crypto: using certificate chain %s", file_crpt_file_cer);
 216         SSL_CTX_use_certificate_chain_file(ssl_ctx, file_crpt_file_cer);
 217
 218         syslog(LOG_DEBUG, "crypto: using private key %s", file_crpt_file_key);
 219         SSL_CTX_use_PrivateKey_file(ssl_ctx, file_crpt_file_key, SSL_FILETYPE_PEM);
 220         if ( !SSL_CTX_check_private_key(ssl_ctx) ) {
 221                 syslog(LOG_ERR, "crypto: cannot install certificate: %s", ERR_reason_error_string(ERR_get_error()));
 222         }
 223 }
 224
 225
 226 // Check the modification time of the key and certificate files.  Reload if either one changed.
 227 void update_key_and_cert_if_needed(void) {
 228         static time_t previous_mtime = 0;
 229         struct stat keystat;
 230         struct stat certstat;
 231
 232         if (stat(file_crpt_file_key, &keystat) != 0) {
 233                 syslog(LOG_ERR, "%s: %s", file_crpt_file_key, strerror(errno));
 234                 return;
 235         }
 236         if (stat(file_crpt_file_cer, &certstat) != 0) {
 237                 syslog(LOG_ERR, "%s: %s", file_crpt_file_cer, strerror(errno));
 238                 return;
 239         }
 240
 241         if ((keystat.st_mtime + certstat.st_mtime) != previous_mtime) {
 242                 bind_to_key_and_certificate();
 243                 previous_mtime = keystat.st_mtime + certstat.st_mtime;
 244         }
 245 }
 246
 247
 248 // Initialize the SSL/TLS subsystem.
 249 void init_ssl(void) {
 250         SSL_library_init();                                             // Initialize SSL transport layer
 251         SSL_load_error_strings();
 252         if (!(ssl_ctx = SSL_CTX_new(SSLv23_server_method()))) {
 253                 syslog(LOG_ERR, "crypto: SSL_CTX_new failed: %s", ERR_reason_error_string(ERR_get_error()));
 254                 return;
 255         }
 256         if (!(SSL_CTX_set_cipher_list(ssl_ctx, CIT_CIPHERS))) {
 257                 syslog(LOG_ERR, "crypto: No ciphers available");
 258                 SSL_CTX_free(ssl_ctx);
 259                 ssl_ctx = NULL;
 260                 return;
 261         }
 262
 263         mkdir(ctdl_key_dir, 0700);                                      // If the keys directory does not exist, create it
 264         generate_key(file_crpt_file_key);                               // If a private key does not exist, create it
 265         generate_certificate(file_crpt_file_key, file_crpt_file_cer);   // If a certificate does not exist, create it
 266         bind_to_key_and_certificate();                                  // Load key and cert from disk, and bind to them.
 267
 268         // Finally let the server know we're here
 269         CtdlRegisterProtoHook(cmd_stls, "STLS", "Start SSL/TLS session");
 270         CtdlRegisterProtoHook(cmd_gtls, "GTLS", "Get SSL/TLS session status");
 271         CtdlRegisterSessionHook(endtls, EVT_STOP, PRIO_STOP + 10);
 272 }
 273
 274
 275 // client_write_ssl() Send binary data to the client encrypted.
 276 void client_write_ssl(const char *buf, int nbytes) {
 277         int retval;
 278         int nremain;
 279         char junk[1];
 280
 281         nremain = nbytes;
 282
 283         while (nremain > 0) {
 284                 if (SSL_want_write(CC->ssl)) {
 285                         if ((SSL_read(CC->ssl, junk, 0)) < 1) {
 286                                 syslog(LOG_DEBUG, "crypto: SSL_read in client_write: %s", ERR_reason_error_string(ERR_get_error()));
 287                         }
 288                 }
 289                 retval =
 290                     SSL_write(CC->ssl, &buf[nbytes - nremain], nremain);
 291                 if (retval < 1) {
 292                         long errval;
 293
 294                         errval = SSL_get_error(CC->ssl, retval);
 295                         if (errval == SSL_ERROR_WANT_READ ||
 296                             errval == SSL_ERROR_WANT_WRITE) {
 297                                 sleep(1);
 298                                 continue;
 299                         }
 300                         syslog(LOG_DEBUG, "crypto: SSL_write got error %ld, ret %d", errval, retval);
 301                         if (retval == -1) {
 302                                 syslog(LOG_DEBUG, "crypto: errno is %d", errno);
 303                         }
 304                         endtls();
 305                         client_write(&buf[nbytes - nremain], nremain);
 306                         return;
 307                 }
 308                 nremain -= retval;
 309         }
 310 }
 311
 312
 313 // read data from the encrypted layer.
 314 int client_read_sslbuffer(StrBuf *buf, int timeout) {
 315         char sbuf[16384];       // OpenSSL communicates in 16k blocks, so let's speak its native tongue.
 316         int rlen;
 317         char junk[1];
 318         SSL *pssl = CC->ssl;
 319
 320         if (pssl == NULL) return(-1);
 321
 322         while (1) {
 323                 if (SSL_want_read(pssl)) {
 324                         if ((SSL_write(pssl, junk, 0)) < 1) {
 325                                 syslog(LOG_DEBUG, "crypto: SSL_write in client_read");
 326                         }
 327                 }
 328                 rlen = SSL_read(pssl, sbuf, sizeof(sbuf));
 329                 if (rlen < 1) {
 330                         long errval;
 331
 332                         errval = SSL_get_error(pssl, rlen);
 333                         if (errval == SSL_ERROR_WANT_READ || errval == SSL_ERROR_WANT_WRITE) {
 334                                 sleep(1);
 335                                 continue;
 336                         }
 337                         syslog(LOG_DEBUG, "crypto: SSL_read got error %ld", errval);
 338                         endtls();
 339                         return (-1);
 340                 }
 341                 StrBufAppendBufPlain(buf, sbuf, rlen, 0);
 342                 return rlen;
 343         }
 344         return (0);
 345 }
 346
 347
 348 int client_readline_sslbuffer(StrBuf *Line, StrBuf *IOBuf, const char **Pos, int timeout) {
 349         const char *pos = NULL;
 350         const char *pLF;
 351         int len, rlen;
 352         int nSuccessLess = 0;
 353         const char *pch = NULL;
 354
 355         if ((Line == NULL) || (Pos == NULL) || (IOBuf == NULL)) {
 356                 if (Pos != NULL) {
 357                         *Pos = NULL;
 358                 }
 359                 return -1;
 360         }
 361
 362         pos = *Pos;
 363         if ((StrLength(IOBuf) > 0) && (pos != NULL) && (pos < ChrPtr(IOBuf) + StrLength(IOBuf))) {
 364                 pch = pos;
 365                 pch = strchr(pch, '\n');
 366
 367                 if (pch == NULL) {
 368                         StrBufAppendBufPlain(Line, pos, StrLength(IOBuf) - (pos - ChrPtr(IOBuf)), 0);
 369                         FlushStrBuf(IOBuf);
 370                         *Pos = NULL;
 371                 }
 372                 else {
 373                         int n = 0;
 374                         if ((pch > ChrPtr(IOBuf)) &&
 375                             (*(pch - 1) == '\r')) {
 376                                 n = 1;
 377                         }
 378                         StrBufAppendBufPlain(Line, pos,
 379                                              (pch - pos - n), 0);
 380
 381                         if (StrLength(IOBuf) <= (pch - ChrPtr(IOBuf) + 1)) {
 382                                 FlushStrBuf(IOBuf);
 383                                 *Pos = NULL;
 384                         }
 385                         else
 386                                 *Pos = pch + 1;
 387                         return StrLength(Line);
 388                 }
 389         }
 390
 391         pLF = NULL;
 392         while ((nSuccessLess < timeout) &&
 393                (pLF == NULL) &&
 394                (CC->ssl != NULL)) {
 395
 396                 rlen = client_read_sslbuffer(IOBuf, timeout);
 397                 if (rlen < 1) {
 398                         return -1;
 399                 }
 400                 else if (rlen > 0) {
 401                         pLF = strchr(ChrPtr(IOBuf), '\n');
 402                 }
 403         }
 404         *Pos = NULL;
 405         if (pLF != NULL) {
 406                 pos = ChrPtr(IOBuf);
 407                 len = pLF - pos;
 408                 if (len > 0 && (*(pLF - 1) == '\r') )
 409                         len --;
 410                 StrBufAppendBufPlain(Line, pos, len, 0);
 411                 if (pLF + 1 >= ChrPtr(IOBuf) + StrLength(IOBuf))
 412                 {
 413                         FlushStrBuf(IOBuf);
 414                 }
 415                 else
 416                         *Pos = pLF + 1;
 417                 return StrLength(Line);
 418         }
 419         return -1;
 420 }
 421
 422
 423 int client_read_sslblob(StrBuf *Target, long bytes, int timeout) {
 424         long baselen;
 425         long RemainRead;
 426         int retval = 0;
 427
 428         baselen = StrLength(Target);
 429
 430         if (StrLength(CC->RecvBuf.Buf) > 0) {
 431                 long RemainLen;
 432                 long TotalLen;
 433                 const char *pchs;
 434
 435                 if (CC->RecvBuf.ReadWritePointer == NULL) {
 436                         CC->RecvBuf.ReadWritePointer = ChrPtr(CC->RecvBuf.Buf);
 437                 }
 438                 pchs = ChrPtr(CC->RecvBuf.Buf);
 439                 TotalLen = StrLength(CC->RecvBuf.Buf);
 440                 RemainLen = TotalLen - (pchs - CC->RecvBuf.ReadWritePointer);
 441                 if (RemainLen > bytes) {
 442                         RemainLen = bytes;
 443                 }
 444                 if (RemainLen > 0) {
 445                         StrBufAppendBufPlain(Target, CC->RecvBuf.ReadWritePointer, RemainLen, 0);
 446                         CC->RecvBuf.ReadWritePointer += RemainLen;
 447                 }
 448                 if ((ChrPtr(CC->RecvBuf.Buf) + StrLength(CC->RecvBuf.Buf)) <= CC->RecvBuf.ReadWritePointer) {
 449                         CC->RecvBuf.ReadWritePointer = NULL;
 450                         FlushStrBuf(CC->RecvBuf.Buf);
 451                 }
 452         }
 453
 454         if (StrLength(Target) >= bytes + baselen) {
 455                 return 1;
 456         }
 457
 458         CC->RecvBuf.ReadWritePointer = NULL;
 459
 460         while ((StrLength(Target) < bytes + baselen) && (retval >= 0)) {
 461                 retval = client_read_sslbuffer(CC->RecvBuf.Buf, timeout);
 462                 if (retval >= 0) {
 463                         RemainRead = bytes - (StrLength (Target) - baselen);
 464                         if (RemainRead < StrLength(CC->RecvBuf.Buf)) {
 465                                 StrBufAppendBufPlain(
 466                                         Target,
 467                                         ChrPtr(CC->RecvBuf.Buf),
 468                                         RemainRead, 0);
 469                                 CC->RecvBuf.ReadWritePointer = ChrPtr(CC->RecvBuf.Buf) + RemainRead;
 470                                 break;
 471                         }
 472                         StrBufAppendBuf(Target, CC->RecvBuf.Buf, 0);    // todo: Buf > bytes?
 473                         FlushStrBuf(CC->RecvBuf.Buf);
 474                 }
 475                 else {
 476                         FlushStrBuf(CC->RecvBuf.Buf);
 477                         return -1;
 478
 479                 }
 480         }
 481         return 1;
 482 }
 483
 484
 485 // CtdlStartTLS() starts SSL/TLS encryption for the current session.  It
 486 // must be supplied with pre-generated strings for responses of "ok," "no
 487 // support for TLS," and "error" so that we can use this in any protocol.
 488 void CtdlStartTLS(char *ok_response, char *nosup_response, char *error_response) {
 489         int retval, bits, alg_bits;
 490
 491         if (CC->redirect_ssl) {
 492                 syslog(LOG_ERR, "crypto: attempt to begin SSL on an already encrypted connection");
 493                 if (error_response != NULL) {
 494                         cprintf("%s", error_response);
 495                 }
 496                 return;
 497         }
 498
 499         if (!ssl_ctx) {
 500                 syslog(LOG_ERR, "crypto: SSL failed: context has not been initialized");
 501                 if (nosup_response != NULL) {
 502                         cprintf("%s", nosup_response);
 503                 }
 504                 return;
 505         }
 506
 507         update_key_and_cert_if_needed();                // did someone update the key or cert?  if so, re-bind them
 508
 509         if (!(CC->ssl = SSL_new(ssl_ctx))) {
 510                 syslog(LOG_ERR, "crypto: SSL_new failed: %s", ERR_reason_error_string(ERR_get_error()));
 511                 if (error_response != NULL) {
 512                         cprintf("%s", error_response);
 513                 }
 514                 return;
 515         }
 516         if (!(SSL_set_fd(CC->ssl, CC->client_socket))) {
 517                 syslog(LOG_ERR, "crypto: SSL_set_fd failed: %s", ERR_reason_error_string(ERR_get_error()));
 518                 SSL_free(CC->ssl);
 519                 CC->ssl = NULL;
 520                 if (error_response != NULL) {
 521                         cprintf("%s", error_response);
 522                 }
 523                 return;
 524         }
 525         if (ok_response != NULL) {
 526                 cprintf("%s", ok_response);
 527         }
 528         retval = SSL_accept(CC->ssl);
 529         if (retval < 1) {
 530                 // Can't notify the client of an error here; they will
 531                 // discover the problem at the SSL layer and should
 532                 // revert to unencrypted communications.
 533                 long errval;
 534                 char error_string[128];
 535
 536                 errval = SSL_get_error(CC->ssl, retval);
 537                 syslog(LOG_ERR, "crypto: SSL_accept failed: retval=%d, errval=%ld, err=%s",
 538                         retval,
 539                         errval,
 540                         ERR_error_string(errval, error_string)
 541                 );
 542                 SSL_free(CC->ssl);
 543                 CC->ssl = NULL;
 544                 return;
 545         }
 546         bits = SSL_CIPHER_get_bits(SSL_get_current_cipher(CC->ssl), &alg_bits);
 547         syslog(LOG_INFO, "crypto: SSL/TLS using %s on %s (%d of %d bits)",
 548                 SSL_CIPHER_get_name(SSL_get_current_cipher(CC->ssl)),
 549                 SSL_CIPHER_get_version(SSL_get_current_cipher(CC->ssl)),
 550                 bits, alg_bits
 551         );
 552         CC->redirect_ssl = 1;
 553 }
 554
 555
 556 // cmd_stls() starts SSL/TLS encryption for the current session
 557 void cmd_stls(char *params) {
 558         char ok_response[SIZ];
 559         char nosup_response[SIZ];
 560         char error_response[SIZ];
 561
 562         unbuffer_output();
 563
 564         sprintf(ok_response, "%d Begin TLS negotiation now\n", CIT_OK);
 565         sprintf(nosup_response, "%d TLS not supported here\n", ERROR + CMD_NOT_SUPPORTED);
 566         sprintf(error_response, "%d TLS negotiation error\n", ERROR + INTERNAL_ERROR);
 567
 568         CtdlStartTLS(ok_response, nosup_response, error_response);
 569 }
 570
 571
 572 // cmd_gtls() returns status info about the TLS connection
 573 void cmd_gtls(char *params) {
 574         int bits, alg_bits;
 575
 576         if (!CC->ssl || !CC->redirect_ssl) {
 577                 cprintf("%d Session is not encrypted.\n", ERROR);
 578                 return;
 579         }
 580         bits =
 581             SSL_CIPHER_get_bits(SSL_get_current_cipher(CC->ssl),
 582                                 &alg_bits);
 583         cprintf("%d %s|%s|%d|%d\n", CIT_OK,
 584                 SSL_CIPHER_get_version(SSL_get_current_cipher(CC->ssl)),
 585                 SSL_CIPHER_get_name(SSL_get_current_cipher(CC->ssl)),
 586                 alg_bits, bits);
 587 }
 588
 589
 590 // endtls() shuts down the TLS connection
 591 //
 592 // WARNING:  This may make your session vulnerable to a known plaintext
 593 // attack in the current implmentation.
 594 void endtls(void) {
 595         if (!CC->ssl) {
 596                 CC->redirect_ssl = 0;
 597                 return;
 598         }
 599
 600         syslog(LOG_INFO, "crypto: ending SSL/TLS");
 601         SSL_shutdown(CC->ssl);
 602         SSL_free(CC->ssl);
 603         CC->ssl = NULL;
 604         CC->redirect_ssl = 0;
 605 }
 606
 607 #endif  // HAVE_OPENSSL