cups/tls-gnutls.c

   1 /*
   2  * TLS support code for CUPS using GNU TLS.
   3  *
   4  * Copyright 2007-2016 by Apple Inc.
   5  * Copyright 1997-2007 by Easy Software Products, all rights reserved.
   6  *
   7  * These coded instructions, statements, and computer programs are the
   8  * property of Apple Inc. and are protected by Federal copyright
   9  * law.  Distribution and use rights are outlined in the file "LICENSE.txt"
  10  * which should have been included with this file.  If this file is
  11  * file is missing or damaged, see the license at "http://www.cups.org/".
  12  *
  13  * This file is subject to the Apple OS-Developed Software exception.
  14  */
  15
  16 /**** This file is included from tls.c ****/
  17
  18 /*
  19  * Include necessary headers...
  20  */
  21
  22 #include <sys/stat.h>
  23
  24
  25 /*
  26  * Local globals...
  27  */
  28
  29 static int              tls_auto_create = 0;
  30                                         /* Auto-create self-signed certs? */
  31 static char             *tls_common_name = NULL;
  32                                         /* Default common name */
  33 static gnutls_x509_crl_t tls_crl = NULL;/* Certificate revocation list */
  34 static char             *tls_keypath = NULL;
  35                                         /* Server cert keychain path */
  36 static _cups_mutex_t    tls_mutex = _CUPS_MUTEX_INITIALIZER;
  37                                         /* Mutex for keychain/certs */
  38 static int              tls_options = -1;/* Options for TLS connections */
  39
  40
  41 /*
  42  * Local functions...
  43  */
  44
  45 static gnutls_x509_crt_t http_gnutls_create_credential(http_credential_t *credential);
  46 static const char       *http_gnutls_default_path(char *buffer, size_t bufsize);
  47 static void             http_gnutls_load_crl(void);
  48 static const char       *http_gnutls_make_path(char *buffer, size_t bufsize, const char *dirname, const char *filename, const char *ext);
  49 static ssize_t          http_gnutls_read(gnutls_transport_ptr_t ptr, void *data, size_t length);
  50 static ssize_t          http_gnutls_write(gnutls_transport_ptr_t ptr, const void *data, size_t length);
  51
  52
  53 /*
  54  * 'cupsMakeServerCredentials()' - Make a self-signed certificate and private key pair.
  55  *
  56  * @since CUPS 2.0/OS 10.10@
  57  */
  58
  59 int                                     /* O - 1 on success, 0 on failure */
  60 cupsMakeServerCredentials(
  61     const char *path,                   /* I - Path to keychain/directory */
  62     const char *common_name,            /* I - Common name */
  63     int        num_alt_names,           /* I - Number of subject alternate names */
  64     const char **alt_names,             /* I - Subject Alternate Names */
  65     time_t     expiration_date)         /* I - Expiration date */
  66 {
  67   gnutls_x509_crt_t     crt;            /* Self-signed certificate */
  68   gnutls_x509_privkey_t key;            /* Encryption private key */
  69   char                  temp[1024],     /* Temporary directory name */
  70                         crtfile[1024],  /* Certificate filename */
  71                         keyfile[1024];  /* Private key filename */
  72   cups_lang_t           *language;      /* Default language info */
  73   cups_file_t           *fp;            /* Key/cert file */
  74   unsigned char         buffer[8192];   /* Buffer for x509 data */
  75   size_t                bytes;          /* Number of bytes of data */
  76   unsigned char         serial[4];      /* Serial number buffer */
  77   time_t                curtime;        /* Current time */
  78   int                   result;         /* Result of GNU TLS calls */
  79
  80
  81   DEBUG_printf(("cupsMakeServerCredentials(path=\"%s\", common_name=\"%s\", num_alt_names=%d, alt_names=%p, expiration_date=%d)", path, common_name, num_alt_names, alt_names, (int)expiration_date));
  82
  83  /*
  84   * Filenames...
  85   */
  86
  87   if (!path)
  88     path = http_gnutls_default_path(temp, sizeof(temp));
  89
  90   if (!path || !common_name)
  91   {
  92     _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(EINVAL), 0);
  93     return (0);
  94   }
  95
  96   http_gnutls_make_path(crtfile, sizeof(crtfile), path, common_name, "crt");
  97   http_gnutls_make_path(keyfile, sizeof(keyfile), path, common_name, "key");
  98
  99  /*
 100   * Create the encryption key...
 101   */
 102
 103   DEBUG_puts("1cupsMakeServerCredentials: Creating key pair.");
 104
 105   gnutls_x509_privkey_init(&key);
 106   gnutls_x509_privkey_generate(key, GNUTLS_PK_RSA, 2048, 0);
 107
 108   DEBUG_puts("1cupsMakeServerCredentials: Key pair created.");
 109
 110  /*
 111   * Save it...
 112   */
 113
 114   bytes = sizeof(buffer);
 115
 116   if ((result = gnutls_x509_privkey_export(key, GNUTLS_X509_FMT_PEM, buffer, &bytes)) < 0)
 117   {
 118     DEBUG_printf(("1cupsMakeServerCredentials: Unable to export private key: %s", gnutls_strerror(result)));
 119     _cupsSetError(IPP_STATUS_ERROR_INTERNAL, gnutls_strerror(result), 0);
 120     gnutls_x509_privkey_deinit(key);
 121     return (0);
 122   }
 123   else if ((fp = cupsFileOpen(keyfile, "w")) != NULL)
 124   {
 125     DEBUG_printf(("1cupsMakeServerCredentials: Writing private key to \"%s\".", keyfile));
 126     cupsFileWrite(fp, (char *)buffer, bytes);
 127     cupsFileClose(fp);
 128   }
 129   else
 130   {
 131     DEBUG_printf(("1cupsMakeServerCredentials: Unable to create private key file \"%s\": %s", keyfile, strerror(errno)));
 132     _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(errno), 0);
 133     gnutls_x509_privkey_deinit(key);
 134     return (0);
 135   }
 136
 137  /*
 138   * Create the self-signed certificate...
 139   */
 140
 141   DEBUG_puts("1cupsMakeServerCredentials: Generating self-signed X.509 certificate.");
 142
 143   language  = cupsLangDefault();
 144   curtime   = time(NULL);
 145   serial[0] = curtime >> 24;
 146   serial[1] = curtime >> 16;
 147   serial[2] = curtime >> 8;
 148   serial[3] = curtime;
 149
 150   gnutls_x509_crt_init(&crt);
 151   if (strlen(language->language) == 5)
 152     gnutls_x509_crt_set_dn_by_oid(crt, GNUTLS_OID_X520_COUNTRY_NAME, 0,
 153                                   language->language + 3, 2);
 154   else
 155     gnutls_x509_crt_set_dn_by_oid(crt, GNUTLS_OID_X520_COUNTRY_NAME, 0,
 156                                   "US", 2);
 157   gnutls_x509_crt_set_dn_by_oid(crt, GNUTLS_OID_X520_COMMON_NAME, 0,
 158                                 common_name, strlen(common_name));
 159   gnutls_x509_crt_set_dn_by_oid(crt, GNUTLS_OID_X520_ORGANIZATION_NAME, 0,
 160                                 common_name, strlen(common_name));
 161   gnutls_x509_crt_set_dn_by_oid(crt, GNUTLS_OID_X520_ORGANIZATIONAL_UNIT_NAME,
 162                                 0, "Unknown", 7);
 163   gnutls_x509_crt_set_dn_by_oid(crt, GNUTLS_OID_X520_STATE_OR_PROVINCE_NAME, 0,
 164                                 "Unknown", 7);
 165   gnutls_x509_crt_set_dn_by_oid(crt, GNUTLS_OID_X520_LOCALITY_NAME, 0,
 166                                 "Unknown", 7);
 167 /*  gnutls_x509_crt_set_dn_by_oid(crt, GNUTLS_OID_PKCS9_EMAIL, 0,
 168                                 ServerAdmin, strlen(ServerAdmin));*/
 169   gnutls_x509_crt_set_key(crt, key);
 170   gnutls_x509_crt_set_serial(crt, serial, sizeof(serial));
 171   gnutls_x509_crt_set_activation_time(crt, curtime);
 172   gnutls_x509_crt_set_expiration_time(crt, curtime + 10 * 365 * 86400);
 173   gnutls_x509_crt_set_ca_status(crt, 0);
 174   if (num_alt_names > 0)
 175     gnutls_x509_crt_set_subject_alternative_name(crt, GNUTLS_SAN_DNSNAME, alt_names[0]);
 176   gnutls_x509_crt_set_key_purpose_oid(crt, GNUTLS_KP_TLS_WWW_SERVER, 0);
 177   gnutls_x509_crt_set_key_usage(crt, GNUTLS_KEY_KEY_ENCIPHERMENT);
 178   gnutls_x509_crt_set_version(crt, 3);
 179
 180   bytes = sizeof(buffer);
 181   if (gnutls_x509_crt_get_key_id(crt, 0, buffer, &bytes) >= 0)
 182     gnutls_x509_crt_set_subject_key_id(crt, buffer, bytes);
 183
 184   gnutls_x509_crt_sign(crt, crt, key);
 185
 186  /*
 187   * Save it...
 188   */
 189
 190   bytes = sizeof(buffer);
 191   if ((result = gnutls_x509_crt_export(crt, GNUTLS_X509_FMT_PEM, buffer, &bytes)) < 0)
 192   {
 193     DEBUG_printf(("1cupsMakeServerCredentials: Unable to export public key and X.509 certificate: %s", gnutls_strerror(result)));
 194     _cupsSetError(IPP_STATUS_ERROR_INTERNAL, gnutls_strerror(result), 0);
 195     gnutls_x509_crt_deinit(crt);
 196     gnutls_x509_privkey_deinit(key);
 197     return (0);
 198   }
 199   else if ((fp = cupsFileOpen(crtfile, "w")) != NULL)
 200   {
 201     DEBUG_printf(("1cupsMakeServerCredentials: Writing public key and X.509 certificate to \"%s\".", crtfile));
 202     cupsFileWrite(fp, (char *)buffer, bytes);
 203     cupsFileClose(fp);
 204   }
 205   else
 206   {
 207     DEBUG_printf(("1cupsMakeServerCredentials: Unable to create public key and X.509 certificate file \"%s\": %s", crtfile, strerror(errno)));
 208     _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(errno), 0);
 209     gnutls_x509_crt_deinit(crt);
 210     gnutls_x509_privkey_deinit(key);
 211     return (0);
 212   }
 213
 214  /*
 215   * Cleanup...
 216   */
 217
 218   gnutls_x509_crt_deinit(crt);
 219   gnutls_x509_privkey_deinit(key);
 220
 221   DEBUG_puts("1cupsMakeServerCredentials: Successfully created credentials.");
 222
 223   return (1);
 224 }
 225
 226
 227 /*
 228  * 'cupsSetServerCredentials()' - Set the default server credentials.
 229  *
 230  * Note: The server credentials are used by all threads in the running process.
 231  * This function is threadsafe.
 232  *
 233  * @since CUPS 2.0/OS 10.10@
 234  */
 235
 236 int                                     /* O - 1 on success, 0 on failure */
 237 cupsSetServerCredentials(
 238     const char *path,                   /* I - Path to keychain/directory */
 239     const char *common_name,            /* I - Default common name for server */
 240     int        auto_create)             /* I - 1 = automatically create self-signed certificates */
 241 {
 242   char  temp[1024];                     /* Default path buffer */
 243
 244
 245   DEBUG_printf(("cupsSetServerCredentials(path=\"%s\", common_name=\"%s\", auto_create=%d)", path, common_name, auto_create));
 246
 247  /*
 248   * Use defaults as needed...
 249   */
 250
 251   if (!path)
 252     path = http_gnutls_default_path(temp, sizeof(temp));
 253
 254  /*
 255   * Range check input...
 256   */
 257
 258   if (!path || !common_name)
 259   {
 260     _cupsSetError(IPP_STATUS_ERROR_INTERNAL, strerror(EINVAL), 0);
 261     return (0);
 262   }
 263
 264   _cupsMutexLock(&tls_mutex);
 265
 266  /*
 267   * Free old values...
 268   */
 269
 270   if (tls_keypath)
 271     _cupsStrFree(tls_keypath);
 272
 273   if (tls_common_name)
 274     _cupsStrFree(tls_common_name);
 275
 276  /*
 277   * Save the new values...
 278   */
 279
 280   tls_keypath     = _cupsStrAlloc(path);
 281   tls_auto_create = auto_create;
 282   tls_common_name = _cupsStrAlloc(common_name);
 283
 284   _cupsMutexUnlock(&tls_mutex);
 285
 286   return (1);
 287 }
 288
 289
 290 /*
 291  * 'httpCopyCredentials()' - Copy the credentials associated with the peer in
 292  *                           an encrypted connection.
 293  *
 294  * @since CUPS 1.5/macOS 10.7@
 295  */
 296
 297 int                                     /* O - Status of call (0 = success) */
 298 httpCopyCredentials(
 299     http_t       *http,                 /* I - Connection to server */
 300     cups_array_t **credentials)         /* O - Array of credentials */
 301 {
 302   unsigned              count;          /* Number of certificates */
 303   const gnutls_datum_t *certs;          /* Certificates */
 304
 305
 306   DEBUG_printf(("httpCopyCredentials(http=%p, credentials=%p)", http, credentials));
 307
 308   if (credentials)
 309     *credentials = NULL;
 310
 311   if (!http || !http->tls || !credentials)
 312     return (-1);
 313
 314   *credentials = cupsArrayNew(NULL, NULL);
 315   certs        = gnutls_certificate_get_peers(http->tls, &count);
 316
 317   DEBUG_printf(("1httpCopyCredentials: certs=%p, count=%u", certs, count));
 318
 319   if (certs && count)
 320   {
 321     while (count > 0)
 322     {
 323       httpAddCredential(*credentials, certs->data, certs->size);
 324       certs ++;
 325       count --;
 326     }
 327   }
 328
 329   return (0);
 330 }
 331
 332
 333 /*
 334  * '_httpCreateCredentials()' - Create credentials in the internal format.
 335  */
 336
 337 http_tls_credentials_t                  /* O - Internal credentials */
 338 _httpCreateCredentials(
 339     cups_array_t *credentials)          /* I - Array of credentials */
 340 {
 341   (void)credentials;
 342
 343   return (NULL);
 344 }
 345
 346
 347 /*
 348  * '_httpFreeCredentials()' - Free internal credentials.
 349  */
 350
 351 void
 352 _httpFreeCredentials(
 353     http_tls_credentials_t credentials) /* I - Internal credentials */
 354 {
 355   (void)credentials;
 356 }
 357
 358
 359 /*
 360  * 'httpCredentialsAreValidForName()' - Return whether the credentials are valid for the given name.
 361  *
 362  * @since CUPS 2.0/OS 10.10@
 363  */
 364
 365 int                                     /* O - 1 if valid, 0 otherwise */
 366 httpCredentialsAreValidForName(
 367     cups_array_t *credentials,          /* I - Credentials */
 368     const char   *common_name)          /* I - Name to check */
 369 {
 370   gnutls_x509_crt_t     cert;           /* Certificate */
 371   int                   result = 0;     /* Result */
 372
 373
 374   cert = http_gnutls_create_credential((http_credential_t *)cupsArrayFirst(credentials));
 375   if (cert)
 376   {
 377     result = gnutls_x509_crt_check_hostname(cert, common_name) != 0;
 378
 379     if (result)
 380     {
 381       int               i,              /* Looping var */
 382                         count;          /* Number of revoked certificates */
 383       unsigned char     cserial[1024],  /* Certificate serial number */
 384                         rserial[1024];  /* Revoked serial number */
 385       size_t            cserial_size,   /* Size of cert serial number */
 386                         rserial_size;   /* Size of revoked serial number */
 387
 388       _cupsMutexLock(&tls_mutex);
 389
 390       count = gnutls_x509_crl_get_crt_count(tls_crl);
 391
 392       if (count > 0)
 393       {
 394         cserial_size = sizeof(cserial);
 395         gnutls_x509_crt_get_serial(cert, cserial, &cserial_size);
 396
 397         for (i = 0; i < count; i ++)
 398         {
 399           rserial_size = sizeof(rserial);
 400           if (!gnutls_x509_crl_get_crt_serial(tls_crl, i, rserial, &rserial_size, NULL) && cserial_size == rserial_size && !memcmp(cserial, rserial, rserial_size))
 401           {
 402             result = 0;
 403             break;
 404           }
 405         }
 406       }
 407
 408       _cupsMutexUnlock(&tls_mutex);
 409     }
 410
 411     gnutls_x509_crt_deinit(cert);
 412   }
 413
 414   return (result);
 415 }
 416
 417
 418 /*
 419  * 'httpCredentialsGetTrust()' - Return the trust of credentials.
 420  *
 421  * @since CUPS 2.0/OS 10.10@
 422  */
 423
 424 http_trust_t                            /* O - Level of trust */
 425 httpCredentialsGetTrust(
 426     cups_array_t *credentials,          /* I - Credentials */
 427     const char   *common_name)          /* I - Common name for trust lookup */
 428 {
 429   http_trust_t          trust = HTTP_TRUST_OK;
 430                                         /* Trusted? */
 431   gnutls_x509_crt_t     cert;           /* Certificate */
 432   cups_array_t          *tcreds = NULL; /* Trusted credentials */
 433   _cups_globals_t       *cg = _cupsGlobals();
 434                                         /* Per-thread globals */
 435
 436
 437   if (!common_name)
 438     return (HTTP_TRUST_UNKNOWN);
 439
 440   if ((cert = http_gnutls_create_credential((http_credential_t *)cupsArrayFirst(credentials))) == NULL)
 441     return (HTTP_TRUST_UNKNOWN);
 442
 443   if (cg->any_root < 0)
 444   {
 445     _cupsSetDefaults();
 446     http_gnutls_load_crl();
 447   }
 448
 449  /*
 450   * Look this common name up in the default keychains...
 451   */
 452
 453   httpLoadCredentials(NULL, &tcreds, common_name);
 454
 455   if (tcreds)
 456   {
 457     char        credentials_str[1024],  /* String for incoming credentials */
 458                 tcreds_str[1024];       /* String for saved credentials */
 459
 460     httpCredentialsString(credentials, credentials_str, sizeof(credentials_str));
 461     httpCredentialsString(tcreds, tcreds_str, sizeof(tcreds_str));
 462
 463     if (strcmp(credentials_str, tcreds_str))
 464     {
 465      /*
 466       * Credentials don't match, let's look at the expiration date of the new
 467       * credentials and allow if the new ones have a later expiration...
 468       */
 469
 470       if (!cg->trust_first)
 471       {
 472        /*
 473         * Do not trust certificates on first use...
 474         */
 475
 476         trust = HTTP_TRUST_INVALID;
 477       }
 478       else if (httpCredentialsGetExpiration(credentials) <= httpCredentialsGetExpiration(tcreds) || !httpCredentialsAreValidForName(credentials, common_name))
 479       {
 480        /*
 481         * Either the new credentials are not newly issued, or the common name
 482         * does not match the issued certificate...
 483         */
 484
 485         trust = HTTP_TRUST_INVALID;
 486       }
 487       else if (httpCredentialsGetExpiration(tcreds) < time(NULL))
 488       {
 489        /*
 490         * Save the renewed credentials...
 491         */
 492
 493         trust = HTTP_TRUST_RENEWED;
 494
 495         httpSaveCredentials(NULL, credentials, common_name);
 496       }
 497     }
 498
 499     httpFreeCredentials(tcreds);
 500   }
 501   else if (cg->validate_certs && !httpCredentialsAreValidForName(credentials, common_name))
 502     trust = HTTP_TRUST_INVALID;
 503
 504   if (trust == HTTP_TRUST_OK && !cg->expired_certs)
 505   {
 506     time_t      curtime;                /* Current date/time */
 507
 508     time(&curtime);
 509     if (curtime < gnutls_x509_crt_get_activation_time(cert) ||
 510         curtime > gnutls_x509_crt_get_expiration_time(cert))
 511       trust = HTTP_TRUST_EXPIRED;
 512   }
 513
 514   if (trust == HTTP_TRUST_OK && !cg->any_root && cupsArrayCount(credentials) == 1)
 515     trust = HTTP_TRUST_INVALID;
 516
 517   gnutls_x509_crt_deinit(cert);
 518
 519   return (trust);
 520 }
 521
 522
 523 /*
 524  * 'httpCredentialsGetExpiration()' - Return the expiration date of the credentials.
 525  *
 526  * @since CUPS 2.0/OS 10.10@
 527  */
 528
 529 time_t                                  /* O - Expiration date of credentials */
 530 httpCredentialsGetExpiration(
 531     cups_array_t *credentials)          /* I - Credentials */
 532 {
 533   gnutls_x509_crt_t     cert;           /* Certificate */
 534   time_t                result = 0;     /* Result */
 535
 536
 537   cert = http_gnutls_create_credential((http_credential_t *)cupsArrayFirst(credentials));
 538   if (cert)
 539   {
 540     result = gnutls_x509_crt_get_expiration_time(cert);
 541     gnutls_x509_crt_deinit(cert);
 542   }
 543
 544   return (result);
 545 }
 546
 547
 548 /*
 549  * 'httpCredentialsString()' - Return a string representing the credentials.
 550  *
 551  * @since CUPS 2.0/OS 10.10@
 552  */
 553
 554 size_t                                  /* O - Total size of credentials string */
 555 httpCredentialsString(
 556     cups_array_t *credentials,          /* I - Credentials */
 557     char         *buffer,               /* I - Buffer or @code NULL@ */
 558     size_t       bufsize)               /* I - Size of buffer */
 559 {
 560   http_credential_t     *first;         /* First certificate */
 561   gnutls_x509_crt_t     cert;           /* Certificate */
 562
 563
 564   DEBUG_printf(("httpCredentialsString(credentials=%p, buffer=%p, bufsize=" CUPS_LLFMT ")", credentials, buffer, CUPS_LLCAST bufsize));
 565
 566   if (!buffer)
 567     return (0);
 568
 569   if (buffer && bufsize > 0)
 570     *buffer = '\0';
 571
 572   if ((first = (http_credential_t *)cupsArrayFirst(credentials)) != NULL &&
 573       (cert = http_gnutls_create_credential(first)) != NULL)
 574   {
 575     char                name[256];      /* Common name associated with cert */
 576     size_t              namelen;        /* Length of name */
 577     time_t              expiration;     /* Expiration date of cert */
 578     _cups_md5_state_t   md5_state;      /* MD5 state */
 579     unsigned char       md5_digest[16]; /* MD5 result */
 580
 581     namelen = sizeof(name) - 1;
 582     if (gnutls_x509_crt_get_dn_by_oid(cert, GNUTLS_OID_X520_COMMON_NAME, 0, 0, name, &namelen) >= 0)
 583       name[namelen] = '\0';
 584     else
 585       strlcpy(name, "unknown", sizeof(name));
 586
 587     expiration = gnutls_x509_crt_get_expiration_time(cert);
 588
 589     _cupsMD5Init(&md5_state);
 590     _cupsMD5Append(&md5_state, first->data, (int)first->datalen);
 591     _cupsMD5Finish(&md5_state, md5_digest);
 592
 593     snprintf(buffer, bufsize, "%s / %s / %02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X%02X", name, httpGetDateString(expiration), md5_digest[0], md5_digest[1], md5_digest[2], md5_digest[3], md5_digest[4], md5_digest[5], md5_digest[6], md5_digest[7], md5_digest[8], md5_digest[9], md5_digest[10], md5_digest[11], md5_digest[12], md5_digest[13], md5_digest[14], md5_digest[15]);
 594
 595     gnutls_x509_crt_deinit(cert);
 596   }
 597
 598   DEBUG_printf(("1httpCredentialsString: Returning \"%s\".", buffer));
 599
 600   return (strlen(buffer));
 601 }
 602
 603
 604 /*
 605  * 'httpLoadCredentials()' - Load X.509 credentials from a keychain file.
 606  *
 607  * @since CUPS 2.0/OS 10.10@
 608  */
 609
 610 int                                     /* O - 0 on success, -1 on error */
 611 httpLoadCredentials(
 612     const char   *path,                 /* I  - Keychain/PKCS#12 path */
 613     cups_array_t **credentials,         /* IO - Credentials */
 614     const char   *common_name)          /* I  - Common name for credentials */
 615 {
 616   cups_file_t           *fp;            /* Certificate file */
 617   char                  filename[1024], /* filename.crt */
 618                         temp[1024],     /* Temporary string */
 619                         line[256];      /* Base64-encoded line */
 620   unsigned char         *data = NULL;   /* Buffer for cert data */
 621   size_t                alloc_data = 0, /* Bytes allocated */
 622                         num_data = 0;   /* Bytes used */
 623   int                   decoded;        /* Bytes decoded */
 624
 625
 626   if (!credentials || !common_name)
 627     return (-1);
 628
 629   if (!path)
 630     path = http_gnutls_default_path(temp, sizeof(temp));
 631   if (!path)
 632     return (-1);
 633
 634   http_gnutls_make_path(filename, sizeof(filename), path, common_name, "crt");
 635
 636   if ((fp = cupsFileOpen(filename, "r")) == NULL)
 637     return (-1);
 638
 639   while (cupsFileGets(fp, line, sizeof(line)))
 640   {
 641     if (!strcmp(line, "-----BEGIN CERTIFICATE-----"))
 642     {
 643       if (num_data)
 644       {
 645        /*
 646         * Missing END CERTIFICATE...
 647         */
 648
 649         httpFreeCredentials(*credentials);
 650         *credentials = NULL;
 651         break;
 652       }
 653     }
 654     else if (!strcmp(line, "-----END CERTIFICATE-----"))
 655     {
 656       if (!num_data)
 657       {
 658        /*
 659         * Missing data...
 660         */
 661
 662         httpFreeCredentials(*credentials);
 663         *credentials = NULL;
 664         break;
 665       }
 666
 667       if (!*credentials)
 668         *credentials = cupsArrayNew(NULL, NULL);
 669
 670       if (httpAddCredential(*credentials, data, num_data))
 671       {
 672         httpFreeCredentials(*credentials);
 673         *credentials = NULL;
 674         break;
 675       }
 676
 677       num_data = 0;
 678     }
 679     else
 680     {
 681       if (alloc_data == 0)
 682       {
 683         data       = malloc(2048);
 684         alloc_data = 2048;
 685
 686         if (!data)
 687           break;
 688       }
 689       else if ((num_data + strlen(line)) >= alloc_data)
 690       {
 691         unsigned char *tdata = realloc(data, alloc_data + 1024);
 692                                         /* Expanded buffer */
 693
 694         if (!tdata)
 695         {
 696           httpFreeCredentials(*credentials);
 697           *credentials = NULL;
 698           break;
 699         }
 700
 701         data       = tdata;
 702         alloc_data += 1024;
 703       }
 704
 705       decoded = alloc_data - num_data;
 706       httpDecode64_2((char *)data + num_data, &decoded, line);
 707       num_data += (size_t)decoded;
 708     }
 709   }
 710
 711   cupsFileClose(fp);
 712
 713   if (num_data)
 714   {
 715    /*
 716     * Missing END CERTIFICATE...
 717     */
 718
 719     httpFreeCredentials(*credentials);
 720     *credentials = NULL;
 721   }
 722
 723   if (data)
 724     free(data);
 725
 726   return (*credentials ? 0 : -1);
 727 }
 728
 729
 730 /*
 731  * 'httpSaveCredentials()' - Save X.509 credentials to a keychain file.
 732  *
 733  * @since CUPS 2.0/OS 10.10@
 734  */
 735
 736 int                                     /* O - -1 on error, 0 on success */
 737 httpSaveCredentials(
 738     const char   *path,                 /* I - Keychain/PKCS#12 path */
 739     cups_array_t *credentials,          /* I - Credentials */
 740     const char   *common_name)          /* I - Common name for credentials */
 741 {
 742   cups_file_t           *fp;            /* Certificate file */
 743   char                  filename[1024], /* filename.crt */
 744                         nfilename[1024],/* filename.crt.N */
 745                         temp[1024],     /* Temporary string */
 746                         line[256];      /* Base64-encoded line */
 747   const unsigned char   *ptr;           /* Pointer into certificate */
 748   ssize_t               remaining;      /* Bytes left */
 749   http_credential_t     *cred;          /* Current credential */
 750
 751
 752   if (!credentials || !common_name)
 753     return (-1);
 754
 755   if (!path)
 756     path = http_gnutls_default_path(temp, sizeof(temp));
 757   if (!path)
 758     return (-1);
 759
 760   http_gnutls_make_path(filename, sizeof(filename), path, common_name, "crt");
 761   snprintf(nfilename, sizeof(nfilename), "%s.N", filename);
 762
 763   if ((fp = cupsFileOpen(nfilename, "w")) == NULL)
 764     return (-1);
 765
 766   fchmod(cupsFileNumber(fp), 0600);
 767
 768   for (cred = (http_credential_t *)cupsArrayFirst(credentials);
 769        cred;
 770        cred = (http_credential_t *)cupsArrayNext(credentials))
 771   {
 772     cupsFilePuts(fp, "-----BEGIN CERTIFICATE-----\n");
 773     for (ptr = cred->data, remaining = (ssize_t)cred->datalen; remaining > 0; remaining -= 45, ptr += 45)
 774     {
 775       httpEncode64_2(line, sizeof(line), (char *)ptr, remaining > 45 ? 45 : remaining);
 776       cupsFilePrintf(fp, "%s\n", line);
 777     }
 778     cupsFilePuts(fp, "-----END CERTIFICATE-----\n");
 779   }
 780
 781   cupsFileClose(fp);
 782
 783   return (rename(nfilename, filename));
 784 }
 785
 786
 787 /*
 788  * 'http_gnutls_create_credential()' - Create a single credential in the internal format.
 789  */
 790
 791 static gnutls_x509_crt_t                        /* O - Certificate */
 792 http_gnutls_create_credential(
 793     http_credential_t *credential)              /* I - Credential */
 794 {
 795   int                   result;                 /* Result from GNU TLS */
 796   gnutls_x509_crt_t     cert;                   /* Certificate */
 797   gnutls_datum_t        datum;                  /* Data record */
 798
 799
 800   DEBUG_printf(("3http_gnutls_create_credential(credential=%p)", credential));
 801
 802   if (!credential)
 803     return (NULL);
 804
 805   if ((result = gnutls_x509_crt_init(&cert)) < 0)
 806   {
 807     DEBUG_printf(("4http_gnutls_create_credential: init error: %s", gnutls_strerror(result)));
 808     return (NULL);
 809   }
 810
 811   datum.data = credential->data;
 812   datum.size = credential->datalen;
 813
 814   if ((result = gnutls_x509_crt_import(cert, &datum, GNUTLS_X509_FMT_DER)) < 0)
 815   {
 816     DEBUG_printf(("4http_gnutls_create_credential: import error: %s", gnutls_strerror(result)));
 817
 818     gnutls_x509_crt_deinit(cert);
 819     return (NULL);
 820   }
 821
 822   return (cert);
 823 }
 824
 825
 826 /*
 827  * 'http_gnutls_default_path()' - Get the default credential store path.
 828  */
 829
 830 static const char *                     /* O - Path or NULL on error */
 831 http_gnutls_default_path(char   *buffer,/* I - Path buffer */
 832                          size_t bufsize)/* I - Size of path buffer */
 833 {
 834   const char *home = getenv("HOME");    /* HOME environment variable */
 835
 836
 837   if (getuid() && home)
 838   {
 839     snprintf(buffer, bufsize, "%s/.cups", home);
 840     if (access(buffer, 0))
 841     {
 842       DEBUG_printf(("1http_gnutls_default_path: Making directory \"%s\".", buffer));
 843       if (mkdir(buffer, 0700))
 844       {
 845         DEBUG_printf(("1http_gnutls_default_path: Failed to make directory: %s", strerror(errno)));
 846         return (NULL);
 847       }
 848     }
 849
 850     snprintf(buffer, bufsize, "%s/.cups/ssl", home);
 851     if (access(buffer, 0))
 852     {
 853       DEBUG_printf(("1http_gnutls_default_path: Making directory \"%s\".", buffer));
 854       if (mkdir(buffer, 0700))
 855       {
 856         DEBUG_printf(("1http_gnutls_default_path: Failed to make directory: %s", strerror(errno)));
 857         return (NULL);
 858       }
 859     }
 860   }
 861   else
 862     strlcpy(buffer, CUPS_SERVERROOT "/ssl", bufsize);
 863
 864   DEBUG_printf(("1http_gnutls_default_path: Using default path \"%s\".", buffer));
 865
 866   return (buffer);
 867 }
 868
 869
 870 /*
 871  * 'http_gnutls_load_crl()' - Load the certificate revocation list, if any.
 872  */
 873
 874 static void
 875 http_gnutls_load_crl(void)
 876 {
 877   _cupsMutexLock(&tls_mutex);
 878
 879   if (!gnutls_x509_crl_init(&tls_crl))
 880   {
 881     cups_file_t         *fp;            /* CRL file */
 882     char                filename[1024], /* site.crl */
 883                         line[256];      /* Base64-encoded line */
 884     unsigned char       *data = NULL;   /* Buffer for cert data */
 885     size_t              alloc_data = 0, /* Bytes allocated */
 886                         num_data = 0;   /* Bytes used */
 887     int                 decoded;        /* Bytes decoded */
 888     gnutls_datum_t      datum;          /* Data record */
 889
 890
 891     http_gnutls_make_path(filename, sizeof(filename), CUPS_SERVERROOT, "site", "crl");
 892
 893     if ((fp = cupsFileOpen(filename, "r")) != NULL)
 894     {
 895       while (cupsFileGets(fp, line, sizeof(line)))
 896       {
 897         if (!strcmp(line, "-----BEGIN X509 CRL-----"))
 898         {
 899           if (num_data)
 900           {
 901            /*
 902             * Missing END X509 CRL...
 903             */
 904
 905             break;
 906           }
 907         }
 908         else if (!strcmp(line, "-----END X509 CRL-----"))
 909         {
 910           if (!num_data)
 911           {
 912            /*
 913             * Missing data...
 914             */
 915
 916             break;
 917           }
 918
 919           datum.data = data;
 920           datum.size = num_data;
 921
 922           gnutls_x509_crl_import(tls_crl, &datum, GNUTLS_X509_FMT_PEM);
 923
 924           num_data = 0;
 925         }
 926         else
 927         {
 928           if (alloc_data == 0)
 929           {
 930             data       = malloc(2048);
 931             alloc_data = 2048;
 932
 933             if (!data)
 934               break;
 935           }
 936           else if ((num_data + strlen(line)) >= alloc_data)
 937           {
 938             unsigned char *tdata = realloc(data, alloc_data + 1024);
 939                                             /* Expanded buffer */
 940
 941             if (!tdata)
 942               break;
 943
 944             data       = tdata;
 945             alloc_data += 1024;
 946           }
 947
 948           decoded = alloc_data - num_data;
 949           httpDecode64_2((char *)data + num_data, &decoded, line);
 950           num_data += (size_t)decoded;
 951         }
 952       }
 953
 954       cupsFileClose(fp);
 955
 956       if (data)
 957         free(data);
 958     }
 959   }
 960
 961   _cupsMutexUnlock(&tls_mutex);
 962 }
 963
 964
 965 /*
 966  * 'http_gnutls_make_path()' - Format a filename for a certificate or key file.
 967  */
 968
 969 static const char *                     /* O - Filename */
 970 http_gnutls_make_path(
 971     char       *buffer,                 /* I - Filename buffer */
 972     size_t     bufsize,                 /* I - Size of buffer */
 973     const char *dirname,                /* I - Directory */
 974     const char *filename,               /* I - Filename (usually hostname) */
 975     const char *ext)                    /* I - Extension */
 976 {
 977   char  *bufptr,                        /* Pointer into buffer */
 978         *bufend = buffer + bufsize - 1; /* End of buffer */
 979
 980
 981   snprintf(buffer, bufsize, "%s/", dirname);
 982   bufptr = buffer + strlen(buffer);
 983
 984   while (*filename && bufptr < bufend)
 985   {
 986     if (_cups_isalnum(*filename) || *filename == '-' || *filename == '.')
 987       *bufptr++ = *filename;
 988     else
 989       *bufptr++ = '_';
 990
 991     filename ++;
 992   }
 993
 994   if (bufptr < bufend)
 995     *bufptr++ = '.';
 996
 997   strlcpy(bufptr, ext, (size_t)(bufend - bufptr + 1));
 998
 999   return (buffer);
1000 }
1001
1002
1003 /*
1004  * 'http_gnutls_read()' - Read function for the GNU TLS library.
1005  */
1006
1007 static ssize_t                          /* O - Number of bytes read or -1 on error */
1008 http_gnutls_read(
1009     gnutls_transport_ptr_t ptr,         /* I - Connection to server */
1010     void                   *data,       /* I - Buffer */
1011     size_t                 length)      /* I - Number of bytes to read */
1012 {
1013   http_t        *http;                  /* HTTP connection */
1014   ssize_t       bytes;                  /* Bytes read */
1015
1016
1017   DEBUG_printf(("6http_gnutls_read(ptr=%p, data=%p, length=%d)", ptr, data, (int)length));
1018
1019   http = (http_t *)ptr;
1020
1021   if (!http->blocking)
1022   {
1023    /*
1024     * Make sure we have data before we read...
1025     */
1026
1027     while (!_httpWait(http, http->wait_value, 0))
1028     {
1029       if (http->timeout_cb && (*http->timeout_cb)(http, http->timeout_data))
1030         continue;
1031
1032       http->error = ETIMEDOUT;
1033       return (-1);
1034     }
1035   }
1036
1037   bytes = recv(http->fd, data, length, 0);
1038   DEBUG_printf(("6http_gnutls_read: bytes=%d", (int)bytes));
1039   return (bytes);
1040 }
1041
1042
1043 /*
1044  * 'http_gnutls_write()' - Write function for the GNU TLS library.
1045  */
1046
1047 static ssize_t                          /* O - Number of bytes written or -1 on error */
1048 http_gnutls_write(
1049     gnutls_transport_ptr_t ptr,         /* I - Connection to server */
1050     const void             *data,       /* I - Data buffer */
1051     size_t                 length)      /* I - Number of bytes to write */
1052 {
1053   ssize_t bytes;                        /* Bytes written */
1054
1055
1056   DEBUG_printf(("6http_gnutls_write(ptr=%p, data=%p, length=%d)", ptr, data,
1057                 (int)length));
1058   bytes = send(((http_t *)ptr)->fd, data, length, 0);
1059   DEBUG_printf(("http_gnutls_write: bytes=%d", (int)bytes));
1060
1061   return (bytes);
1062 }
1063
1064
1065 /*
1066  * '_httpTLSInitialize()' - Initialize the TLS stack.
1067  */
1068
1069 void
1070 _httpTLSInitialize(void)
1071 {
1072  /*
1073   * Initialize GNU TLS...
1074   */
1075
1076   gnutls_global_init();
1077 }
1078
1079
1080 /*
1081  * '_httpTLSPending()' - Return the number of pending TLS-encrypted bytes.
1082  */
1083
1084 size_t                                  /* O - Bytes available */
1085 _httpTLSPending(http_t *http)           /* I - HTTP connection */
1086 {
1087   return (gnutls_record_check_pending(http->tls));
1088 }
1089
1090
1091 /*
1092  * '_httpTLSRead()' - Read from a SSL/TLS connection.
1093  */
1094
1095 int                                     /* O - Bytes read */
1096 _httpTLSRead(http_t *http,              /* I - Connection to server */
1097              char   *buf,               /* I - Buffer to store data */
1098              int    len)                /* I - Length of buffer */
1099 {
1100   ssize_t       result;                 /* Return value */
1101
1102
1103   result = gnutls_record_recv(http->tls, buf, (size_t)len);
1104
1105   if (result < 0 && !errno)
1106   {
1107    /*
1108     * Convert GNU TLS error to errno value...
1109     */
1110
1111     switch (result)
1112     {
1113       case GNUTLS_E_INTERRUPTED :
1114           errno = EINTR;
1115           break;
1116
1117       case GNUTLS_E_AGAIN :
1118           errno = EAGAIN;
1119           break;
1120
1121       default :
1122           errno = EPIPE;
1123           break;
1124     }
1125
1126     result = -1;
1127   }
1128
1129   return ((int)result);
1130 }
1131
1132
1133 /*
1134  * '_httpTLSSetCredentials()' - Set the TLS credentials.
1135  */
1136
1137 int                                     /* O - Status of connection */
1138 _httpTLSSetCredentials(http_t *http)    /* I - Connection to server */
1139 {
1140   (void)http;
1141
1142   return (0);
1143 }
1144
1145
1146 /*
1147  * '_httpTLSSetOptions()' - Set TLS protocol and cipher suite options.
1148  */
1149
1150 void
1151 _httpTLSSetOptions(int options)         /* I - Options */
1152 {
1153   tls_options = options;
1154 }
1155
1156
1157 /*
1158  * '_httpTLSStart()' - Set up SSL/TLS support on a connection.
1159  */
1160
1161 int                                     /* O - 0 on success, -1 on failure */
1162 _httpTLSStart(http_t *http)             /* I - Connection to server */
1163 {
1164   char                  hostname[256],  /* Hostname */
1165                         *hostptr;       /* Pointer into hostname */
1166   int                   status;         /* Status of handshake */
1167   gnutls_certificate_credentials_t *credentials;
1168                                         /* TLS credentials */
1169   char                  priority_string[1024];
1170                                         /* Priority string */
1171
1172
1173   DEBUG_printf(("3_httpTLSStart(http=%p)", http));
1174
1175   if (tls_options < 0)
1176   {
1177     DEBUG_puts("4_httpTLSStart: Setting defaults.");
1178     _cupsSetDefaults();
1179     DEBUG_printf(("4_httpTLSStart: tls_options=%x", tls_options));
1180   }
1181
1182   if (http->mode == _HTTP_MODE_SERVER && !tls_keypath)
1183   {
1184     DEBUG_puts("4_httpTLSStart: cupsSetServerCredentials not called.");
1185     http->error  = errno = EINVAL;
1186     http->status = HTTP_STATUS_ERROR;
1187     _cupsSetError(IPP_STATUS_ERROR_INTERNAL, _("Server credentials not set."), 1);
1188
1189     return (-1);
1190   }
1191
1192   credentials = (gnutls_certificate_credentials_t *)
1193                     malloc(sizeof(gnutls_certificate_credentials_t));
1194   if (credentials == NULL)
1195   {
1196     DEBUG_printf(("8_httpStartTLS: Unable to allocate credentials: %s",
1197                   strerror(errno)));
1198     http->error  = errno;
1199     http->status = HTTP_STATUS_ERROR;
1200     _cupsSetHTTPError(HTTP_STATUS_ERROR);
1201
1202     return (-1);
1203   }
1204
1205   gnutls_certificate_allocate_credentials(credentials);
1206   status = gnutls_init(&http->tls, http->mode == _HTTP_MODE_CLIENT ? GNUTLS_CLIENT : GNUTLS_SERVER);
1207   if (!status)
1208     status = gnutls_set_default_priority(http->tls);
1209
1210   if (status)
1211   {
1212     http->error  = EIO;
1213     http->status = HTTP_STATUS_ERROR;
1214
1215     DEBUG_printf(("4_httpTLSStart: Unable to initialize common TLS parameters: %s", gnutls_strerror(status)));
1216     _cupsSetError(IPP_STATUS_ERROR_CUPS_PKI, gnutls_strerror(status), 0);
1217
1218     gnutls_deinit(http->tls);
1219     gnutls_certificate_free_credentials(*credentials);
1220     free(credentials);
1221     http->tls = NULL;
1222
1223     return (-1);
1224   }
1225
1226   if (http->mode == _HTTP_MODE_CLIENT)
1227   {
1228    /*
1229     * Client: get the hostname to use for TLS...
1230     */
1231
1232     if (httpAddrLocalhost(http->hostaddr))
1233     {
1234       strlcpy(hostname, "localhost", sizeof(hostname));
1235     }
1236     else
1237     {
1238      /*
1239       * Otherwise make sure the hostname we have does not end in a trailing dot.
1240       */
1241
1242       strlcpy(hostname, http->hostname, sizeof(hostname));
1243       if ((hostptr = hostname + strlen(hostname) - 1) >= hostname &&
1244           *hostptr == '.')
1245         *hostptr = '\0';
1246     }
1247
1248     status = gnutls_server_name_set(http->tls, GNUTLS_NAME_DNS, hostname, strlen(hostname));
1249   }
1250   else
1251   {
1252    /*
1253     * Server: get certificate and private key...
1254     */
1255
1256     char        crtfile[1024],          /* Certificate file */
1257                 keyfile[1024];          /* Private key file */
1258     int         have_creds = 0;         /* Have credentials? */
1259
1260     if (http->fields[HTTP_FIELD_HOST][0])
1261     {
1262      /*
1263       * Use hostname for TLS upgrade...
1264       */
1265
1266       strlcpy(hostname, http->fields[HTTP_FIELD_HOST], sizeof(hostname));
1267     }
1268     else
1269     {
1270      /*
1271       * Resolve hostname from connection address...
1272       */
1273
1274       http_addr_t       addr;           /* Connection address */
1275       socklen_t         addrlen;        /* Length of address */
1276
1277       addrlen = sizeof(addr);
1278       if (getsockname(http->fd, (struct sockaddr *)&addr, &addrlen))
1279       {
1280         DEBUG_printf(("4_httpTLSStart: Unable to get socket address: %s", strerror(errno)));
1281         hostname[0] = '\0';
1282       }
1283       else if (httpAddrLocalhost(&addr))
1284         hostname[0] = '\0';
1285       else
1286       {
1287         httpAddrLookup(&addr, hostname, sizeof(hostname));
1288         DEBUG_printf(("4_httpTLSStart: Resolved socket address to \"%s\".", hostname));
1289       }
1290     }
1291
1292     if (isdigit(hostname[0] & 255) || hostname[0] == '[')
1293       hostname[0] = '\0';               /* Don't allow numeric addresses */
1294
1295     if (hostname[0])
1296     {
1297      /*
1298       * First look for CA certs...
1299       */
1300
1301       snprintf(crtfile, sizeof(crtfile), "/etc/letsencrypt/live/%s/fullchain.pem", hostname);
1302       snprintf(keyfile, sizeof(keyfile), "/etc/letsencrypt/live/%s/privkey.pem", hostname);
1303
1304       if ((access(crtfile, R_OK) || access(keyfile, R_OK)) && (hostptr = strchr(hostname, '.')) != NULL)
1305       {
1306        /*
1307         * Try just domain name...
1308         */
1309
1310         hostptr ++;
1311         if (strchr(hostptr, '.'))
1312         {
1313           snprintf(crtfile, sizeof(crtfile), "/etc/letsencrypt/live/%s/fullchain.pem", hostptr);
1314           snprintf(keyfile, sizeof(keyfile), "/etc/letsencrypt/live/%s/privkey.pem", hostptr);
1315         }
1316       }
1317
1318       if (access(crtfile, R_OK) || access(keyfile, R_OK))
1319       {
1320        /*
1321         * Then look in the CUPS keystore...
1322         */
1323
1324         http_gnutls_make_path(crtfile, sizeof(crtfile), tls_keypath, hostname, "crt");
1325         http_gnutls_make_path(keyfile, sizeof(keyfile), tls_keypath, hostname, "key");
1326       }
1327
1328       have_creds = !access(crtfile, R_OK) && !access(keyfile, R_OK);
1329     }
1330     else if (tls_common_name)
1331     {
1332      /*
1333       * First look for CA certs...
1334       */
1335
1336       snprintf(crtfile, sizeof(crtfile), "/etc/letsencrypt/live/%s/fullchain.pem", tls_common_name);
1337       snprintf(keyfile, sizeof(keyfile), "/etc/letsencrypt/live/%s/privkey.pem", tls_common_name);
1338
1339       if ((access(crtfile, R_OK) || access(keyfile, R_OK)) && (hostptr = strchr(tls_common_name, '.')) != NULL)
1340       {
1341        /*
1342         * Try just domain name...
1343         */
1344
1345         hostptr ++;
1346         if (strchr(hostptr, '.'))
1347         {
1348           snprintf(crtfile, sizeof(crtfile), "/etc/letsencrypt/live/%s/fullchain.pem", hostptr);
1349           snprintf(keyfile, sizeof(keyfile), "/etc/letsencrypt/live/%s/privkey.pem", hostptr);
1350         }
1351       }
1352
1353       if (access(crtfile, R_OK) || access(keyfile, R_OK))
1354       {
1355        /*
1356         * Then look in the CUPS keystore...
1357         */
1358
1359         http_gnutls_make_path(crtfile, sizeof(crtfile), tls_keypath, tls_common_name, "crt");
1360         http_gnutls_make_path(keyfile, sizeof(keyfile), tls_keypath, tls_common_name, "key");
1361       }
1362
1363       have_creds = !access(crtfile, R_OK) && !access(keyfile, R_OK);
1364     }
1365
1366     if (!have_creds && tls_auto_create && (hostname[0] || tls_common_name))
1367     {
1368       DEBUG_printf(("4_httpTLSStart: Auto-create credentials for \"%s\".", hostname[0] ? hostname : tls_common_name));
1369
1370       if (!cupsMakeServerCredentials(tls_keypath, hostname[0] ? hostname : tls_common_name, 0, NULL, time(NULL) + 365 * 86400))
1371       {
1372         DEBUG_puts("4_httpTLSStart: cupsMakeServerCredentials failed.");
1373         http->error  = errno = EINVAL;
1374         http->status = HTTP_STATUS_ERROR;
1375         _cupsSetError(IPP_STATUS_ERROR_INTERNAL, _("Unable to create server credentials."), 1);
1376
1377         return (-1);
1378       }
1379     }
1380
1381     DEBUG_printf(("4_httpTLSStart: Using certificate \"%s\" and private key \"%s\".", crtfile, keyfile));
1382
1383     if (!status)
1384       status = gnutls_certificate_set_x509_key_file(*credentials, crtfile, keyfile, GNUTLS_X509_FMT_PEM);
1385   }
1386
1387   if (!status)
1388     status = gnutls_credentials_set(http->tls, GNUTLS_CRD_CERTIFICATE, *credentials);
1389
1390   if (status)
1391   {
1392     http->error  = EIO;
1393     http->status = HTTP_STATUS_ERROR;
1394
1395     DEBUG_printf(("4_httpTLSStart: Unable to complete client/server setup: %s", gnutls_strerror(status)));
1396     _cupsSetError(IPP_STATUS_ERROR_CUPS_PKI, gnutls_strerror(status), 0);
1397
1398     gnutls_deinit(http->tls);
1399     gnutls_certificate_free_credentials(*credentials);
1400     free(credentials);
1401     http->tls = NULL;
1402
1403     return (-1);
1404   }
1405
1406   strlcpy(priority_string, "NORMAL", sizeof(priority_string));
1407
1408   if (tls_options & _HTTP_TLS_DENY_TLS10)
1409     strlcat(priority_string, ":+VERS-TLS-ALL:-VERS-TLS1.0:-VERS-SSL3.0", sizeof(priority_string));
1410   else if (tls_options & _HTTP_TLS_ALLOW_SSL3)
1411     strlcat(priority_string, ":+VERS-TLS-ALL", sizeof(priority_string));
1412   else
1413     strlcat(priority_string, ":+VERS-TLS-ALL:-VERS-SSL3.0", sizeof(priority_string));
1414
1415   if (!(tls_options & _HTTP_TLS_ALLOW_RC4))
1416     strlcat(priority_string, ":-ARCFOUR-128", sizeof(priority_string));
1417
1418   if (!(tls_options & _HTTP_TLS_ALLOW_DH))
1419     strlcat(priority_string, ":!ANON-DH", sizeof(priority_string));
1420
1421 #ifdef HAVE_GNUTLS_PRIORITY_SET_DIRECT
1422   gnutls_priority_set_direct(http->tls, priority_string, NULL);
1423
1424 #else
1425   gnutls_priority_t priority;           /* Priority */
1426
1427   gnutls_priority_init(&priority, priority_string, NULL);
1428   gnutls_priority_set(http->tls, priority);
1429   gnutls_priority_deinit(priority);
1430 #endif /* HAVE_GNUTLS_PRIORITY_SET_DIRECT */
1431
1432   gnutls_transport_set_ptr(http->tls, (gnutls_transport_ptr_t)http);
1433   gnutls_transport_set_pull_function(http->tls, http_gnutls_read);
1434 #ifdef HAVE_GNUTLS_TRANSPORT_SET_PULL_TIMEOUT_FUNCTION
1435   gnutls_transport_set_pull_timeout_function(http->tls, (gnutls_pull_timeout_func)httpWait);
1436 #endif /* HAVE_GNUTLS_TRANSPORT_SET_PULL_TIMEOUT_FUNCTION */
1437   gnutls_transport_set_push_function(http->tls, http_gnutls_write);
1438
1439   while ((status = gnutls_handshake(http->tls)) != GNUTLS_E_SUCCESS)
1440   {
1441     DEBUG_printf(("5_httpStartTLS: gnutls_handshake returned %d (%s)",
1442                   status, gnutls_strerror(status)));
1443
1444     if (gnutls_error_is_fatal(status))
1445     {
1446       http->error  = EIO;
1447       http->status = HTTP_STATUS_ERROR;
1448
1449       _cupsSetError(IPP_STATUS_ERROR_CUPS_PKI, gnutls_strerror(status), 0);
1450
1451       gnutls_deinit(http->tls);
1452       gnutls_certificate_free_credentials(*credentials);
1453       free(credentials);
1454       http->tls = NULL;
1455
1456       return (-1);
1457     }
1458   }
1459
1460   http->tls_credentials = credentials;
1461
1462   return (0);
1463 }
1464
1465
1466 /*
1467  * '_httpTLSStop()' - Shut down SSL/TLS on a connection.
1468  */
1469
1470 void
1471 _httpTLSStop(http_t *http)              /* I - Connection to server */
1472 {
1473   int   error;                          /* Error code */
1474
1475
1476   error = gnutls_bye(http->tls, http->mode == _HTTP_MODE_CLIENT ? GNUTLS_SHUT_RDWR : GNUTLS_SHUT_WR);
1477   if (error != GNUTLS_E_SUCCESS)
1478     _cupsSetError(IPP_STATUS_ERROR_INTERNAL, gnutls_strerror(errno), 0);
1479
1480   gnutls_deinit(http->tls);
1481   http->tls = NULL;
1482
1483   if (http->tls_credentials)
1484   {
1485     gnutls_certificate_free_credentials(*(http->tls_credentials));
1486     free(http->tls_credentials);
1487     http->tls_credentials = NULL;
1488   }
1489 }
1490
1491
1492 /*
1493  * '_httpTLSWrite()' - Write to a SSL/TLS connection.
1494  */
1495
1496 int                                     /* O - Bytes written */
1497 _httpTLSWrite(http_t     *http,         /* I - Connection to server */
1498               const char *buf,          /* I - Buffer holding data */
1499               int        len)           /* I - Length of buffer */
1500 {
1501   ssize_t       result;                 /* Return value */
1502
1503
1504   DEBUG_printf(("2http_write_ssl(http=%p, buf=%p, len=%d)", http, buf, len));
1505
1506   result = gnutls_record_send(http->tls, buf, (size_t)len);
1507
1508   if (result < 0 && !errno)
1509   {
1510    /*
1511     * Convert GNU TLS error to errno value...
1512     */
1513
1514     switch (result)
1515     {
1516       case GNUTLS_E_INTERRUPTED :
1517           errno = EINTR;
1518           break;
1519
1520       case GNUTLS_E_AGAIN :
1521           errno = EAGAIN;
1522           break;
1523
1524       default :
1525           errno = EPIPE;
1526           break;
1527     }
1528
1529     result = -1;
1530   }
1531
1532   DEBUG_printf(("3http_write_ssl: Returning %d.", (int)result));
1533
1534   return ((int)result);
1535 }