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   if (major_status == GSS_S_CONTINUE_NEEDED)
 313     cups_gss_printf(major_status, minor_status,
 314                     "_cupsSetNegotiateAuthString: Continuation needed!");
 315
 316   if (output_token.length > 0 && output_token.length <= 65536)
 317   {
 318    /*
 319     * Allocate the authorization string since Windows KDCs can have
 320     * arbitrarily large credentials...
 321     */
 322
 323     int authsize = 10 +                         /* "Negotiate " */
 324                    output_token.length * 4 / 3 + 1 +    /* Base64 */
 325                    1;                                   /* nul */
 326
 327     httpSetAuthString(http, NULL, NULL);
 328
 329     if ((http->authstring = malloc(authsize)) == NULL)
 330     {
 331       http->authstring = http->_authstring;
 332       authsize         = sizeof(http->_authstring);
 333     }
 334
 335     strcpy(http->authstring, "Negotiate ");
 336     httpEncode64_2(http->authstring + 10, authsize - 10, output_token.value,
 337                    output_token.length);
 338
 339     gss_release_buffer(&minor_status, &output_token);
 340   }
 341   else
 342   {
 343     DEBUG_printf(("1_cupsSetNegotiateAuthString: Kerberos credentials too "
 344                   "large - %d bytes!", (int)output_token.length));
 345     gss_release_buffer(&minor_status, &output_token);
 346
 347     return (-1);
 348   }
 349
 350   return (0);
 351 }
 352
 353
 354 /*
 355  * 'cups_get_gssname()' - Get CUPS service credentials for authentication.
 356  */
 357
 358 static gss_name_t                       /* O - Server name */
 359 cups_get_gssname(
 360     http_t     *http,                   /* I - Connection to server */
 361     const char *service_name)           /* I - Service name */
 362 {
 363   gss_buffer_desc token = GSS_C_EMPTY_BUFFER;
 364                                         /* Service token */
 365   OM_uint32       major_status,         /* Major status code */
 366                   minor_status;         /* Minor status code */
 367   gss_name_t      server_name;          /* Server name */
 368   char            buf[1024],            /* Name buffer */
 369                   fqdn[HTTP_MAX_URI];   /* Server name buffer */
 370
 371
 372   DEBUG_printf(("7cups_get_gssname(http=%p, service_name=\"%s\")", http,
 373                 service_name));
 374
 375
 376  /*
 377   * Get the hostname...
 378   */
 379
 380   httpGetHostname(http, fqdn, sizeof(fqdn));
 381
 382   if (!strcmp(fqdn, "localhost"))
 383     httpGetHostname(NULL, fqdn, sizeof(fqdn));
 384
 385  /*
 386   * Get a server name we can use for authentication purposes...
 387   */
 388
 389   snprintf(buf, sizeof(buf), "%s@%s", service_name, fqdn);
 390
 391   DEBUG_printf(("9cups_get_gssname: Looking up %s...", buf));
 392
 393   token.value  = buf;
 394   token.length = strlen(buf);
 395   server_name  = GSS_C_NO_NAME;
 396   major_status = gss_import_name(&minor_status, &token,
 397                                  GSS_C_NT_HOSTBASED_SERVICE,
 398                                  &server_name);
 399
 400   if (GSS_ERROR(major_status))
 401   {
 402     cups_gss_printf(major_status, minor_status,
 403                     "cups_get_gssname: gss_import_name() failed");
 404     return (NULL);
 405   }
 406
 407   return (server_name);
 408 }
 409
 410
 411 #  ifdef DEBUG
 412 /*
 413  * 'cups_gss_printf()' - Show debug error messages from GSSAPI...
 414  */
 415
 416 static void
 417 cups_gss_printf(OM_uint32  major_status,/* I - Major status code */
 418                 OM_uint32  minor_status,/* I - Minor status code */
 419                 const char *message)    /* I - Prefix for error message */
 420 {
 421   OM_uint32     err_major_status,       /* Major status code for display */
 422                 err_minor_status;       /* Minor status code for display */
 423   OM_uint32     msg_ctx;                /* Message context */
 424   gss_buffer_desc major_status_string = GSS_C_EMPTY_BUFFER,
 425                                         /* Major status message */
 426                 minor_status_string = GSS_C_EMPTY_BUFFER;
 427                                         /* Minor status message */
 428
 429
 430   msg_ctx          = 0;
 431   err_major_status = gss_display_status(&err_minor_status,
 432                                         major_status,
 433                                         GSS_C_GSS_CODE,
 434                                         GSS_C_NO_OID,
 435                                         &msg_ctx,
 436                                         &major_status_string);
 437
 438   if (!GSS_ERROR(err_major_status))
 439     gss_display_status(&err_minor_status, minor_status, GSS_C_MECH_CODE,
 440                        GSS_C_NULL_OID, &msg_ctx, &minor_status_string);
 441
 442   DEBUG_printf(("1%s: %s, %s", message, (char *)major_status_string.value,
 443                 (char *)minor_status_string.value));
 444
 445   gss_release_buffer(&err_minor_status, &major_status_string);
 446   gss_release_buffer(&err_minor_status, &minor_status_string);
 447 }
 448 #  endif /* DEBUG */
 449 #endif /* HAVE_GSSAPI */
 450
 451
 452 /*
 453  * 'cups_local_auth()' - Get the local authorization certificate if
 454  *                       available/applicable...
 455  */
 456
 457 static int                              /* O - 0 if available */
 458                                         /*     1 if not available */
 459                                         /*    -1 error */
 460 cups_local_auth(http_t *http)           /* I - HTTP connection to server */
 461 {
 462 #if defined(WIN32) || defined(__EMX__)
 463  /*
 464   * Currently WIN32 and OS-2 do not support the CUPS server...
 465   */
 466
 467   return (1);
 468 #else
 469   int                   pid;            /* Current process ID */
 470   FILE                  *fp;            /* Certificate file */
 471   char                  trc[16],        /* Try Root Certificate parameter */
 472                         filename[1024], /* Certificate filename */
 473                         certificate[33];/* Certificate string */
 474   _cups_globals_t *cg = _cupsGlobals(); /* Global data */
 475 #  if defined(HAVE_AUTHORIZATION_H)
 476   OSStatus              status;         /* Status */
 477   AuthorizationItem     auth_right;     /* Authorization right */
 478   AuthorizationRights   auth_rights;    /* Authorization rights */
 479   AuthorizationFlags    auth_flags;     /* Authorization flags */
 480   AuthorizationExternalForm auth_extrn; /* Authorization ref external */
 481   char                  auth_key[1024]; /* Buffer */
 482   char                  buffer[1024];   /* Buffer */
 483 #  endif /* HAVE_AUTHORIZATION_H */
 484
 485
 486   DEBUG_printf(("7cups_local_auth(http=%p) hostaddr=%s, hostname=\"%s\"",
 487                 http, httpAddrString(http->hostaddr, filename, sizeof(filename)), http->hostname));
 488
 489  /*
 490   * See if we are accessing localhost...
 491   */
 492
 493   if (!httpAddrLocalhost(http->hostaddr) &&
 494       strcasecmp(http->hostname, "localhost") != 0)
 495   {
 496     DEBUG_puts("8cups_local_auth: Not a local connection!");
 497     return (1);
 498   }
 499
 500 #  if defined(HAVE_AUTHORIZATION_H)
 501  /*
 502   * Delete any previous authorization reference...
 503   */
 504
 505   if (http->auth_ref)
 506   {
 507     AuthorizationFree(http->auth_ref, kAuthorizationFlagDefaults);
 508     http->auth_ref = NULL;
 509   }
 510
 511   if (!getenv("GATEWAY_INTERFACE") &&
 512       httpGetSubField2(http, HTTP_FIELD_WWW_AUTHENTICATE, "authkey",
 513                        auth_key, sizeof(auth_key)))
 514   {
 515     status = AuthorizationCreate(NULL, kAuthorizationEmptyEnvironment,
 516                                  kAuthorizationFlagDefaults, &http->auth_ref);
 517     if (status != errAuthorizationSuccess)
 518     {
 519       DEBUG_printf(("8cups_local_auth: AuthorizationCreate() returned %d (%s)",
 520                     (int)status, cssmErrorString(status)));
 521       return (-1);
 522     }
 523
 524     auth_right.name        = auth_key;
 525     auth_right.valueLength = 0;
 526     auth_right.value       = NULL;
 527     auth_right.flags       = 0;
 528
 529     auth_rights.count = 1;
 530     auth_rights.items = &auth_right;
 531
 532     auth_flags = kAuthorizationFlagDefaults |
 533                  kAuthorizationFlagPreAuthorize |
 534                  kAuthorizationFlagInteractionAllowed |
 535                  kAuthorizationFlagExtendRights;
 536
 537     status = AuthorizationCopyRights(http->auth_ref, &auth_rights,
 538                                      kAuthorizationEmptyEnvironment,
 539                                      auth_flags, NULL);
 540     if (status == errAuthorizationSuccess)
 541       status = AuthorizationMakeExternalForm(http->auth_ref, &auth_extrn);
 542
 543     if (status == errAuthorizationSuccess)
 544     {
 545      /*
 546       * Set the authorization string and return...
 547       */
 548
 549       httpEncode64_2(buffer, sizeof(buffer), (void *)&auth_extrn,
 550                      sizeof(auth_extrn));
 551
 552       httpSetAuthString(http, "AuthRef", buffer);
 553
 554       DEBUG_printf(("8cups_local_auth: Returning authstring=\"%s\"",
 555                     http->authstring));
 556       return (0);
 557     }
 558     else if (status == errAuthorizationCanceled)
 559       return (-1);
 560
 561     DEBUG_printf(("9cups_local_auth: AuthorizationCopyRights() returned %d (%s)",
 562                   (int)status, cssmErrorString(status)));
 563
 564   /*
 565    * Fall through to try certificates...
 566    */
 567   }
 568 #  endif /* HAVE_AUTHORIZATION_H */
 569
 570 #  if defined(SO_PEERCRED) && defined(AF_LOCAL)
 571  /*
 572   * See if we can authenticate using the peer credentials provided over a
 573   * domain socket; if so, specify "PeerCred username" as the authentication
 574   * information...
 575   */
 576
 577   if (
 578 #    ifdef HAVE_GSSAPI
 579       strncmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Negotiate", 9) &&
 580 #    endif /* HAVE_GSSAPI */
 581 #    ifdef HAVE_AUTHORIZATION_H
 582       !httpGetSubField2(http, HTTP_FIELD_WWW_AUTHENTICATE, "authkey",
 583                         auth_key, sizeof(auth_key)) &&
 584 #    endif /* HAVE_AUTHORIZATION_H */
 585       http->hostaddr->addr.sa_family == AF_LOCAL &&
 586       !getenv("GATEWAY_INTERFACE"))     /* Not via CGI programs... */
 587   {
 588    /*
 589     * Verify that the current cupsUser() matches the current UID...
 590     */
 591
 592     struct passwd       *pwd;           /* Password information */
 593     const char          *username;      /* Current username */
 594
 595     username = cupsUser();
 596
 597     if ((pwd = getpwnam(username)) != NULL && pwd->pw_uid == getuid())
 598     {
 599       httpSetAuthString(http, "PeerCred", username);
 600
 601       DEBUG_printf(("8cups_local_auth: Returning authstring=\"%s\"",
 602                     http->authstring));
 603
 604       return (0);
 605     }
 606   }
 607 #  endif /* SO_PEERCRED && AF_LOCAL */
 608
 609  /*
 610   * Try opening a certificate file for this PID.  If that fails,
 611   * try the root certificate...
 612   */
 613
 614   pid = getpid();
 615   snprintf(filename, sizeof(filename), "%s/certs/%d", cg->cups_statedir, pid);
 616   if ((fp = fopen(filename, "r")) == NULL && pid > 0)
 617   {
 618    /*
 619     * No certificate for this PID; see if we can get the root certificate...
 620     */
 621
 622     DEBUG_printf(("9cups_local_auth: Unable to open file %s: %s",
 623                   filename, strerror(errno)));
 624
 625 #  ifdef HAVE_GSSAPI
 626     if (!strncmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Negotiate", 9))
 627     {
 628      /*
 629       * Kerberos required, don't try the root certificate...
 630       */
 631
 632       return (1);
 633     }
 634 #  endif /* HAVE_GSSAPI */
 635
 636 #  ifdef HAVE_AUTHORIZATION_H
 637     if (httpGetSubField2(http, HTTP_FIELD_WWW_AUTHENTICATE, "authkey",
 638                          auth_key, sizeof(auth_key)))
 639     {
 640      /*
 641       * Don't use the root certificate as a replacement for an authkey...
 642       */
 643
 644       return (1);
 645     }
 646 #  endif /* HAVE_AUTHORIZATION_H */
 647     if (!httpGetSubField2(http, HTTP_FIELD_WWW_AUTHENTICATE, "trc", trc,
 648                           sizeof(trc)))
 649     {
 650      /*
 651       * Scheduler doesn't want us to use the root certificate...
 652       */
 653
 654       return (1);
 655     }
 656
 657     snprintf(filename, sizeof(filename), "%s/certs/0", cg->cups_statedir);
 658     fp = fopen(filename, "r");
 659   }
 660
 661   if (fp)
 662   {
 663    /*
 664     * Read the certificate from the file...
 665     */
 666
 667     fgets(certificate, sizeof(certificate), fp);
 668     fclose(fp);
 669
 670    /*
 671     * Set the authorization string and return...
 672     */
 673
 674     httpSetAuthString(http, "Local", certificate);
 675
 676     DEBUG_printf(("8cups_local_auth: Returning authstring=\"%s\"",
 677                   http->authstring));
 678
 679     return (0);
 680   }
 681
 682   return (1);
 683 #endif /* WIN32 || __EMX__ */
 684 }
 685
 686
 687 /*
 688  * End of "$Id: auth.c 7720 2008-07-11 22:46:21Z mike $".
 689  */