cups/auth.c

   1 /*
   2  * "$Id: auth.c 7720 2008-07-11 22:46:21Z mike $"
   3  *
   4  *   Authentication functions for CUPS.
   5  *
   6  *   Copyright 2007-2011 by Apple Inc.
   7  *   Copyright 1997-2007 by Easy Software Products.
   8  *
   9  *   This file contains Kerberos support code, copyright 2006 by
  10  *   Jelmer Vernooij.
  11  *
  12  *   These coded instructions, statements, and computer programs are the
  13  *   property of Apple Inc. and are protected by Federal copyright
  14  *   law.  Distribution and use rights are outlined in the file "LICENSE.txt"
  15  *   which should have been included with this file.  If this file is
  16  *   file is missing or damaged, see the license at "http://www.cups.org/".
  17  *
  18  *   This file is subject to the Apple OS-Developed Software exception.
  19  *
  20  * Contents:
  21  *
  22  *   cupsDoAuthentication() - Authenticate a request.
  23  *   cups_get_gssname()     - Get GSSAPI name for authentication.
  24  *   cups_gss_printf()      - Show error messages from GSSAPI...
  25  *   cups_local_auth()      - Get the local authorization certificate if
  26  *                            available/applicable...
  27  */
  28
  29 /*
  30  * Include necessary headers...
  31  */
  32
  33 #include "cups-private.h"
  34 #include <fcntl.h>
  35 #include <sys/stat.h>
  36 #if defined(WIN32) || defined(__EMX__)
  37 #  include <io.h>
  38 #else
  39 #  include <unistd.h>
  40 #endif /* WIN32 || __EMX__ */
  41
  42 #if HAVE_AUTHORIZATION_H
  43 #  include <Security/Authorization.h>
  44 #  ifdef HAVE_SECBASEPRIV_H
  45 #    include <Security/SecBasePriv.h>
  46 #  else
  47 extern const char *cssmErrorString(int error);
  48 #  endif /* HAVE_SECBASEPRIV_H */
  49 #endif /* HAVE_AUTHORIZATION_H */
  50
  51 #if defined(SO_PEERCRED) && defined(AF_LOCAL)
  52 #  include <pwd.h>
  53 #endif /* SO_PEERCRED && AF_LOCAL */
  54
  55
  56 /*
  57  * Local functions...
  58  */
  59
  60 #ifdef HAVE_GSSAPI
  61 static gss_name_t cups_get_gssname(http_t *http, const char *service_name);
  62 #  ifdef DEBUG
  63 static void     cups_gss_printf(OM_uint32 major_status, OM_uint32 minor_status,
  64                                 const char *message);
  65 #  else
  66 #    define     cups_gss_printf(major, minor, message)
  67 #  endif /* DEBUG */
  68 #endif /* HAVE_GSSAPI */
  69 static int      cups_local_auth(http_t *http);
  70
  71
  72 /*
  73  * 'cupsDoAuthentication()' - Authenticate a request.
  74  *
  75  * This function should be called in response to a @code HTTP_UNAUTHORIZED@
  76  * status, prior to resubmitting your request.
  77  *
  78  * @since CUPS 1.1.20/Mac OS X 10.4@
  79  */
  80
  81 int                                     /* O - 0 on success, -1 on error */
  82 cupsDoAuthentication(
  83     http_t     *http,                   /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
  84     const char *method,                 /* I - Request method ("GET", "POST", "PUT") */
  85     const char *resource)               /* I - Resource path */
  86 {
  87   const char    *password;              /* Password string */
  88   char          prompt[1024],           /* Prompt for user */
  89                 realm[HTTP_MAX_VALUE],  /* realm="xyz" string */
  90                 nonce[HTTP_MAX_VALUE];  /* nonce="xyz" string */
  91   int           localauth;              /* Local authentication result */
  92   _cups_globals_t *cg;                  /* Global data */
  93
  94
  95   DEBUG_printf(("cupsDoAuthentication(http=%p, method=\"%s\", resource=\"%s\")",
  96                 http, method, resource));
  97
  98   if (!http)
  99     http = _cupsConnect();
 100
 101   if (!http || !method || !resource)
 102     return (-1);
 103
 104   DEBUG_printf(("2cupsDoAuthentication: digest_tries=%d, userpass=\"%s\"",
 105                 http->digest_tries, http->userpass));
 106   DEBUG_printf(("2cupsDoAuthentication: WWW-Authenticate=\"%s\"",
 107                 httpGetField(http, HTTP_FIELD_WWW_AUTHENTICATE)));
 108
 109  /*
 110   * Clear the current authentication string...
 111   */
 112
 113   httpSetAuthString(http, NULL, NULL);
 114
 115  /*
 116   * See if we can do local authentication...
 117   */
 118
 119   if (http->digest_tries < 3)
 120   {
 121     if ((localauth = cups_local_auth(http)) == 0)
 122     {
 123       DEBUG_printf(("2cupsDoAuthentication: authstring=\"%s\"",
 124                     http->authstring));
 125
 126       if (http->status == HTTP_UNAUTHORIZED)
 127         http->digest_tries ++;
 128
 129       return (0);
 130     }
 131     else if (localauth == -1)
 132     {
 133       http->status = HTTP_AUTHORIZATION_CANCELED;
 134       return (-1);                      /* Error or canceled */
 135     }
 136   }
 137
 138  /*
 139   * Nope, see if we should retry the current username:password...
 140   */
 141
 142   if ((http->digest_tries > 1 || !http->userpass[0]) &&
 143       (!strncmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Basic", 5) ||
 144        !strncmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Digest", 6)))
 145   {
 146    /*
 147     * Nope - get a new password from the user...
 148     */
 149
 150     cg = _cupsGlobals();
 151
 152     if (!cg->lang_default)
 153       cg->lang_default = cupsLangDefault();
 154
 155     snprintf(prompt, sizeof(prompt),
 156              _cupsLangString(cg->lang_default, _("Password for %s on %s? ")),
 157              cupsUser(),
 158              http->hostname[0] == '/' ? "localhost" : http->hostname);
 159
 160     http->digest_tries  = strncasecmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE],
 161                                       "Digest", 5) != 0;
 162     http->userpass[0]   = '\0';
 163
 164     if ((password = cupsGetPassword2(prompt, http, method, resource)) == NULL)
 165     {
 166       http->status = HTTP_AUTHORIZATION_CANCELED;
 167       return (-1);
 168     }
 169
 170     snprintf(http->userpass, sizeof(http->userpass), "%s:%s", cupsUser(),
 171              password);
 172   }
 173   else if (http->status == HTTP_UNAUTHORIZED)
 174     http->digest_tries ++;
 175
 176   if (http->status == HTTP_UNAUTHORIZED && http->digest_tries >= 3)
 177   {
 178     DEBUG_printf(("1cupsDoAuthentication: Too many authentication tries (%d)",
 179                   http->digest_tries));
 180
 181     http->status = HTTP_AUTHORIZATION_CANCELED;
 182     return (-1);
 183   }
 184
 185  /*
 186   * Got a password; encode it for the server...
 187   */
 188
 189 #ifdef HAVE_GSSAPI
 190   if (!strncmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Negotiate", 9))
 191   {
 192    /*
 193     * Kerberos authentication...
 194     */
 195
 196     if (_cupsSetNegotiateAuthString(http))
 197     {
 198       http->status = HTTP_AUTHORIZATION_CANCELED;
 199       return (-1);
 200     }
 201   }
 202   else
 203 #endif /* HAVE_GSSAPI */
 204   if (!strncmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Basic", 5))
 205   {
 206    /*
 207     * Basic authentication...
 208     */
 209
 210     char        encode[256];            /* Base64 buffer */
 211
 212
 213     httpEncode64_2(encode, sizeof(encode), http->userpass,
 214                    (int)strlen(http->userpass));
 215     httpSetAuthString(http, "Basic", encode);
 216   }
 217   else if (!strncmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Digest", 6))
 218   {
 219    /*
 220     * Digest authentication...
 221     */
 222
 223     char        encode[33],             /* MD5 buffer */
 224                 digest[1024];           /* Digest auth data */
 225
 226
 227     httpGetSubField(http, HTTP_FIELD_WWW_AUTHENTICATE, "realm", realm);
 228     httpGetSubField(http, HTTP_FIELD_WWW_AUTHENTICATE, "nonce", nonce);
 229
 230     httpMD5(cupsUser(), realm, strchr(http->userpass, ':') + 1, encode);
 231     httpMD5Final(nonce, method, resource, encode);
 232     snprintf(digest, sizeof(digest),
 233              "username=\"%s\", realm=\"%s\", nonce=\"%s\", uri=\"%s\", "
 234              "response=\"%s\"", cupsUser(), realm, nonce, resource, encode);
 235     httpSetAuthString(http, "Digest", digest);
 236   }
 237   else
 238   {
 239     DEBUG_printf(("1cupsDoAuthentication: Unknown auth type: \"%s\"",
 240                   http->fields[HTTP_FIELD_WWW_AUTHENTICATE]));
 241     http->status = HTTP_AUTHORIZATION_CANCELED;
 242     return (-1);
 243   }
 244
 245   DEBUG_printf(("1cupsDoAuthentication: authstring=\"%s\"", http->authstring));
 246
 247   return (0);
 248 }
 249
 250
 251 #ifdef HAVE_GSSAPI
 252 /*
 253  * '_cupsSetNegotiateAuthString()' - Set the Kerberos authentication string.
 254  */
 255
 256 int                                     /* O - 0 on success, -1 on error */
 257 _cupsSetNegotiateAuthString(
 258     http_t *http)                       /* I - Connection to server */
 259 {
 260   OM_uint32     minor_status,           /* Minor status code */
 261                 major_status;           /* Major status code */
 262   gss_buffer_desc output_token = GSS_C_EMPTY_BUFFER;
 263                                         /* Output token */
 264   _cups_globals_t *cg = _cupsGlobals(); /* Thread globals */
 265
 266
 267 #  ifdef __APPLE__
 268  /*
 269   * If the weak-linked GSSAPI/Kerberos library is not present, don't try
 270   * to use it...
 271   */
 272
 273   if (gss_init_sec_context == NULL)
 274   {
 275     DEBUG_puts("1_cupsSetNegotiateAuthString: Weak-linked GSSAPI/Kerberos "
 276                "framework is not present");
 277     return (-1);
 278   }
 279 #  endif /* __APPLE__ */
 280
 281   if (http->gssname == GSS_C_NO_NAME)
 282   {
 283     if (!cg->gss_service_name[0])
 284       _cupsSetDefaults();
 285
 286     http->gssname = cups_get_gssname(http, cg->gss_service_name);
 287   }
 288
 289   if (http->gssctx != GSS_C_NO_CONTEXT)
 290   {
 291     gss_delete_sec_context(&minor_status, &http->gssctx, GSS_C_NO_BUFFER);
 292     http->gssctx = GSS_C_NO_CONTEXT;
 293   }
 294
 295   major_status  = gss_init_sec_context(&minor_status, GSS_C_NO_CREDENTIAL,
 296                                        &http->gssctx,
 297                                        http->gssname, http->gssmech,
 298                                        GSS_C_MUTUAL_FLAG | GSS_C_INTEG_FLAG,
 299                                        GSS_C_INDEFINITE,
 300                                        GSS_C_NO_CHANNEL_BINDINGS,
 301                                        GSS_C_NO_BUFFER, &http->gssmech,
 302                                        &output_token, NULL, NULL);
 303
 304   if (GSS_ERROR(major_status))
 305   {
 306     cups_gss_printf(major_status, minor_status,
 307                     "_cupsSetNegotiateAuthString: Unable to initialize "
 308                     "security context");
 309     return (-1);
 310   }
 311
 312 #ifdef DEBUG
 313   if (major_status == GSS_S_CONTINUE_NEEDED)
 314     cups_gss_printf(major_status, minor_status,
 315                     "_cupsSetNegotiateAuthString: Continuation needed!");
 316 #endif /* DEBUG */
 317
 318   if (output_token.length > 0 && output_token.length <= 65536)
 319   {
 320    /*
 321     * Allocate the authorization string since Windows KDCs can have
 322     * arbitrarily large credentials...
 323     */
 324
 325     int authsize = 10 +                         /* "Negotiate " */
 326                    output_token.length * 4 / 3 + 1 +    /* Base64 */
 327                    1;                                   /* nul */
 328
 329     httpSetAuthString(http, NULL, NULL);
 330
 331     if ((http->authstring = malloc(authsize)) == NULL)
 332     {
 333       http->authstring = http->_authstring;
 334       authsize         = sizeof(http->_authstring);
 335     }
 336
 337     strcpy(http->authstring, "Negotiate ");
 338     httpEncode64_2(http->authstring + 10, authsize - 10, output_token.value,
 339                    output_token.length);
 340
 341     gss_release_buffer(&minor_status, &output_token);
 342   }
 343   else
 344   {
 345     DEBUG_printf(("1_cupsSetNegotiateAuthString: Kerberos credentials too "
 346                   "large - %d bytes!", (int)output_token.length));
 347     gss_release_buffer(&minor_status, &output_token);
 348
 349     return (-1);
 350   }
 351
 352   return (0);
 353 }
 354
 355
 356 /*
 357  * 'cups_get_gssname()' - Get CUPS service credentials for authentication.
 358  */
 359
 360 static gss_name_t                       /* O - Server name */
 361 cups_get_gssname(
 362     http_t     *http,                   /* I - Connection to server */
 363     const char *service_name)           /* I - Service name */
 364 {
 365   gss_buffer_desc token = GSS_C_EMPTY_BUFFER;
 366                                         /* Service token */
 367   OM_uint32       major_status,         /* Major status code */
 368                   minor_status;         /* Minor status code */
 369   gss_name_t      server_name;          /* Server name */
 370   char            buf[1024],            /* Name buffer */
 371                   fqdn[HTTP_MAX_URI];   /* Server name buffer */
 372
 373
 374   DEBUG_printf(("7cups_get_gssname(http=%p, service_name=\"%s\")", http,
 375                 service_name));
 376
 377
 378  /*
 379   * Get the hostname...
 380   */
 381
 382   httpGetHostname(http, fqdn, sizeof(fqdn));
 383
 384   if (!strcmp(fqdn, "localhost"))
 385     httpGetHostname(NULL, fqdn, sizeof(fqdn));
 386
 387  /*
 388   * Get a server name we can use for authentication purposes...
 389   */
 390
 391   snprintf(buf, sizeof(buf), "%s@%s", service_name, fqdn);
 392
 393   DEBUG_printf(("9cups_get_gssname: Looking up %s...", buf));
 394
 395   token.value  = buf;
 396   token.length = strlen(buf);
 397   server_name  = GSS_C_NO_NAME;
 398   major_status = gss_import_name(&minor_status, &token,
 399                                  GSS_C_NT_HOSTBASED_SERVICE,
 400                                  &server_name);
 401
 402   if (GSS_ERROR(major_status))
 403   {
 404     cups_gss_printf(major_status, minor_status,
 405                     "cups_get_gssname: gss_import_name() failed");
 406     return (NULL);
 407   }
 408
 409   return (server_name);
 410 }
 411
 412
 413 #  ifdef DEBUG
 414 /*
 415  * 'cups_gss_printf()' - Show debug error messages from GSSAPI...
 416  */
 417
 418 static void
 419 cups_gss_printf(OM_uint32  major_status,/* I - Major status code */
 420                 OM_uint32  minor_status,/* I - Minor status code */
 421                 const char *message)    /* I - Prefix for error message */
 422 {
 423   OM_uint32     err_major_status,       /* Major status code for display */
 424                 err_minor_status;       /* Minor status code for display */
 425   OM_uint32     msg_ctx;                /* Message context */
 426   gss_buffer_desc major_status_string = GSS_C_EMPTY_BUFFER,
 427                                         /* Major status message */
 428                 minor_status_string = GSS_C_EMPTY_BUFFER;
 429                                         /* Minor status message */
 430
 431
 432   msg_ctx          = 0;
 433   err_major_status = gss_display_status(&err_minor_status,
 434                                         major_status,
 435                                         GSS_C_GSS_CODE,
 436                                         GSS_C_NO_OID,
 437                                         &msg_ctx,
 438                                         &major_status_string);
 439
 440   if (!GSS_ERROR(err_major_status))
 441     gss_display_status(&err_minor_status, minor_status, GSS_C_MECH_CODE,
 442                        GSS_C_NULL_OID, &msg_ctx, &minor_status_string);
 443
 444   DEBUG_printf(("1%s: %s, %s", message, (char *)major_status_string.value,
 445                 (char *)minor_status_string.value));
 446
 447   gss_release_buffer(&err_minor_status, &major_status_string);
 448   gss_release_buffer(&err_minor_status, &minor_status_string);
 449 }
 450 #  endif /* DEBUG */
 451 #endif /* HAVE_GSSAPI */
 452
 453
 454 /*
 455  * 'cups_local_auth()' - Get the local authorization certificate if
 456  *                       available/applicable...
 457  */
 458
 459 static int                              /* O - 0 if available */
 460                                         /*     1 if not available */
 461                                         /*    -1 error */
 462 cups_local_auth(http_t *http)           /* I - HTTP connection to server */
 463 {
 464 #if defined(WIN32) || defined(__EMX__)
 465  /*
 466   * Currently WIN32 and OS-2 do not support the CUPS server...
 467   */
 468
 469   return (1);
 470 #else
 471   int                   pid;            /* Current process ID */
 472   FILE                  *fp;            /* Certificate file */
 473   char                  trc[16],        /* Try Root Certificate parameter */
 474                         filename[1024], /* Certificate filename */
 475                         certificate[33];/* Certificate string */
 476   _cups_globals_t *cg = _cupsGlobals(); /* Global data */
 477 #  if defined(HAVE_AUTHORIZATION_H)
 478   OSStatus              status;         /* Status */
 479   AuthorizationItem     auth_right;     /* Authorization right */
 480   AuthorizationRights   auth_rights;    /* Authorization rights */
 481   AuthorizationFlags    auth_flags;     /* Authorization flags */
 482   AuthorizationExternalForm auth_extrn; /* Authorization ref external */
 483   char                  auth_key[1024]; /* Buffer */
 484   char                  buffer[1024];   /* Buffer */
 485 #  endif /* HAVE_AUTHORIZATION_H */
 486
 487
 488   DEBUG_printf(("7cups_local_auth(http=%p) hostaddr=%s, hostname=\"%s\"",
 489                 http, httpAddrString(http->hostaddr, filename, sizeof(filename)), http->hostname));
 490
 491  /*
 492   * See if we are accessing localhost...
 493   */
 494
 495   if (!httpAddrLocalhost(http->hostaddr) &&
 496       strcasecmp(http->hostname, "localhost") != 0)
 497   {
 498     DEBUG_puts("8cups_local_auth: Not a local connection!");
 499     return (1);
 500   }
 501
 502 #  if defined(HAVE_AUTHORIZATION_H)
 503  /*
 504   * Delete any previous authorization reference...
 505   */
 506
 507   if (http->auth_ref)
 508   {
 509     AuthorizationFree(http->auth_ref, kAuthorizationFlagDefaults);
 510     http->auth_ref = NULL;
 511   }
 512
 513   if (!getenv("GATEWAY_INTERFACE") &&
 514       httpGetSubField2(http, HTTP_FIELD_WWW_AUTHENTICATE, "authkey",
 515                        auth_key, sizeof(auth_key)))
 516   {
 517     status = AuthorizationCreate(NULL, kAuthorizationEmptyEnvironment,
 518                                  kAuthorizationFlagDefaults, &http->auth_ref);
 519     if (status != errAuthorizationSuccess)
 520     {
 521       DEBUG_printf(("8cups_local_auth: AuthorizationCreate() returned %d (%s)",
 522                     (int)status, cssmErrorString(status)));
 523       return (-1);
 524     }
 525
 526     auth_right.name        = auth_key;
 527     auth_right.valueLength = 0;
 528     auth_right.value       = NULL;
 529     auth_right.flags       = 0;
 530
 531     auth_rights.count = 1;
 532     auth_rights.items = &auth_right;
 533
 534     auth_flags = kAuthorizationFlagDefaults |
 535                  kAuthorizationFlagPreAuthorize |
 536                  kAuthorizationFlagInteractionAllowed |
 537                  kAuthorizationFlagExtendRights;
 538
 539     status = AuthorizationCopyRights(http->auth_ref, &auth_rights,
 540                                      kAuthorizationEmptyEnvironment,
 541                                      auth_flags, NULL);
 542     if (status == errAuthorizationSuccess)
 543       status = AuthorizationMakeExternalForm(http->auth_ref, &auth_extrn);
 544
 545     if (status == errAuthorizationSuccess)
 546     {
 547      /*
 548       * Set the authorization string and return...
 549       */
 550
 551       httpEncode64_2(buffer, sizeof(buffer), (void *)&auth_extrn,
 552                      sizeof(auth_extrn));
 553
 554       httpSetAuthString(http, "AuthRef", buffer);
 555
 556       DEBUG_printf(("8cups_local_auth: Returning authstring=\"%s\"",
 557                     http->authstring));
 558       return (0);
 559     }
 560     else if (status == errAuthorizationCanceled)
 561       return (-1);
 562
 563     DEBUG_printf(("9cups_local_auth: AuthorizationCopyRights() returned %d (%s)",
 564                   (int)status, cssmErrorString(status)));
 565
 566   /*
 567    * Fall through to try certificates...
 568    */
 569   }
 570 #  endif /* HAVE_AUTHORIZATION_H */
 571
 572 #  if defined(SO_PEERCRED) && defined(AF_LOCAL)
 573  /*
 574   * See if we can authenticate using the peer credentials provided over a
 575   * domain socket; if so, specify "PeerCred username" as the authentication
 576   * information...
 577   */
 578
 579   if (
 580 #    ifdef HAVE_GSSAPI
 581       strncmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Negotiate", 9) &&
 582 #    endif /* HAVE_GSSAPI */
 583 #    ifdef HAVE_AUTHORIZATION_H
 584       !httpGetSubField2(http, HTTP_FIELD_WWW_AUTHENTICATE, "authkey",
 585                         auth_key, sizeof(auth_key)) &&
 586 #    endif /* HAVE_AUTHORIZATION_H */
 587       http->hostaddr->addr.sa_family == AF_LOCAL &&
 588       !getenv("GATEWAY_INTERFACE"))     /* Not via CGI programs... */
 589   {
 590    /*
 591     * Verify that the current cupsUser() matches the current UID...
 592     */
 593
 594     struct passwd       *pwd;           /* Password information */
 595     const char          *username;      /* Current username */
 596
 597     username = cupsUser();
 598
 599     if ((pwd = getpwnam(username)) != NULL && pwd->pw_uid == getuid())
 600     {
 601       httpSetAuthString(http, "PeerCred", username);
 602
 603       DEBUG_printf(("8cups_local_auth: Returning authstring=\"%s\"",
 604                     http->authstring));
 605
 606       return (0);
 607     }
 608   }
 609 #  endif /* SO_PEERCRED && AF_LOCAL */
 610
 611  /*
 612   * Try opening a certificate file for this PID.  If that fails,
 613   * try the root certificate...
 614   */
 615
 616   pid = getpid();
 617   snprintf(filename, sizeof(filename), "%s/certs/%d", cg->cups_statedir, pid);
 618   if ((fp = fopen(filename, "r")) == NULL && pid > 0)
 619   {
 620    /*
 621     * No certificate for this PID; see if we can get the root certificate...
 622     */
 623
 624     DEBUG_printf(("9cups_local_auth: Unable to open file %s: %s",
 625                   filename, strerror(errno)));
 626
 627 #  ifdef HAVE_GSSAPI
 628     if (!strncmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Negotiate", 9))
 629     {
 630      /*
 631       * Kerberos required, don't try the root certificate...
 632       */
 633
 634       return (1);
 635     }
 636 #  endif /* HAVE_GSSAPI */
 637
 638 #  ifdef HAVE_AUTHORIZATION_H
 639     if (httpGetSubField2(http, HTTP_FIELD_WWW_AUTHENTICATE, "authkey",
 640                          auth_key, sizeof(auth_key)))
 641     {
 642      /*
 643       * Don't use the root certificate as a replacement for an authkey...
 644       */
 645
 646       return (1);
 647     }
 648 #  endif /* HAVE_AUTHORIZATION_H */
 649     if (!httpGetSubField2(http, HTTP_FIELD_WWW_AUTHENTICATE, "trc", trc,
 650                           sizeof(trc)))
 651     {
 652      /*
 653       * Scheduler doesn't want us to use the root certificate...
 654       */
 655
 656       return (1);
 657     }
 658
 659     snprintf(filename, sizeof(filename), "%s/certs/0", cg->cups_statedir);
 660     fp = fopen(filename, "r");
 661   }
 662
 663   if (fp)
 664   {
 665    /*
 666     * Read the certificate from the file...
 667     */
 668
 669     fgets(certificate, sizeof(certificate), fp);
 670     fclose(fp);
 671
 672    /*
 673     * Set the authorization string and return...
 674     */
 675
 676     httpSetAuthString(http, "Local", certificate);
 677
 678     DEBUG_printf(("8cups_local_auth: Returning authstring=\"%s\"",
 679                   http->authstring));
 680
 681     return (0);
 682   }
 683
 684   return (1);
 685 #endif /* WIN32 || __EMX__ */
 686 }
 687
 688
 689 /*
 690  * End of "$Id: auth.c 7720 2008-07-11 22:46:21Z mike $".
 691  */