cups/auth.c

   1 /*
   2  * "$Id: auth.c 7720 2008-07-11 22:46:21Z mike $"
   3  *
   4  *   Authentication functions for the Common UNIX Printing System (CUPS).
   5  *
   6  *   Copyright 2007-2009 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 "globals.h"
  34 #include "debug.h"
  35 #include <stdlib.h>
  36 #include <ctype.h>
  37 #include <errno.h>
  38 #include <fcntl.h>
  39 #include <sys/stat.h>
  40 #if defined(WIN32) || defined(__EMX__)
  41 #  include <io.h>
  42 #else
  43 #  include <unistd.h>
  44 #endif /* WIN32 || __EMX__ */
  45
  46 #if HAVE_AUTHORIZATION_H
  47 #  include <Security/Authorization.h>
  48 #  ifdef HAVE_SECBASEPRIV_H
  49 #    include <Security/SecBasePriv.h>
  50 #  else
  51 extern const char *cssmErrorString(int error);
  52 #  endif /* HAVE_SECBASEPRIV_H */
  53 #endif /* HAVE_AUTHORIZATION_H */
  54
  55 #if defined(SO_PEERCRED) && defined(AF_LOCAL)
  56 #  include <pwd.h>
  57 #endif /* SO_PEERCRED && AF_LOCAL */
  58
  59
  60 /*
  61  * Local functions...
  62  */
  63
  64 #ifdef HAVE_GSSAPI
  65 static gss_name_t cups_get_gssname(http_t *http, const char *service_name);
  66 #  ifdef DEBUG
  67 static void     cups_gss_printf(OM_uint32 major_status, OM_uint32 minor_status,
  68                                 const char *message);
  69 #  else
  70 #    define     cups_gss_printf(major, minor, message)
  71 #  endif /* DEBUG */
  72 #endif /* HAVE_GSSAPI */
  73 static int      cups_local_auth(http_t *http);
  74
  75
  76 /*
  77  * 'cupsDoAuthentication()' - Authenticate a request.
  78  *
  79  * This function should be called in response to a @code HTTP_UNAUTHORIZED@
  80  * status, prior to resubmitting your request.
  81  *
  82  * @since CUPS 1.1.20/Mac OS X 10.4@
  83  */
  84
  85 int                                     /* O - 0 on success, -1 on error */
  86 cupsDoAuthentication(
  87     http_t     *http,                   /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
  88     const char *method,                 /* I - Request method ("GET", "POST", "PUT") */
  89     const char *resource)               /* I - Resource path */
  90 {
  91   const char    *password;              /* Password string */
  92   char          prompt[1024],           /* Prompt for user */
  93                 realm[HTTP_MAX_VALUE],  /* realm="xyz" string */
  94                 nonce[HTTP_MAX_VALUE];  /* nonce="xyz" string */
  95   int           localauth;              /* Local authentication result */
  96   _cups_globals_t *cg;                  /* Global data */
  97
  98
  99   DEBUG_printf(("cupsDoAuthentication(http=%p, method=\"%s\", resource=\"%s\")",
 100                 http, method, resource));
 101   DEBUG_printf(("2cupsDoAuthentication: digest_tries=%d, userpass=\"%s\"",
 102                 http->digest_tries, http->userpass));
 103   DEBUG_printf(("2cupsDoAuthentication: WWW-Authenticate=\"%s\"",
 104                 httpGetField(http, HTTP_FIELD_WWW_AUTHENTICATE)));
 105
 106   if (!http)
 107     http = _cupsConnect();
 108
 109   if (!http || !method || !resource)
 110     return (-1);
 111
 112  /*
 113   * Clear the current authentication string...
 114   */
 115
 116   httpSetAuthString(http, NULL, NULL);
 117
 118  /*
 119   * See if we can do local authentication...
 120   */
 121
 122   if (http->digest_tries < 3)
 123   {
 124     if ((localauth = cups_local_auth(http)) == 0)
 125     {
 126       DEBUG_printf(("2cupsDoAuthentication: authstring=\"%s\"",
 127                     http->authstring));
 128
 129       if (http->status == HTTP_UNAUTHORIZED)
 130         http->digest_tries ++;
 131
 132       return (0);
 133     }
 134     else if (localauth == -1)
 135     {
 136       http->status = HTTP_AUTHORIZATION_CANCELED;
 137       return (-1);                      /* Error or canceled */
 138     }
 139   }
 140
 141  /*
 142   * Nope, see if we should retry the current username:password...
 143   */
 144
 145   if ((http->digest_tries > 1 || !http->userpass[0]) &&
 146       strncmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Negotiate", 9))
 147   {
 148    /*
 149     * Nope - get a new password from the user...
 150     */
 151
 152     cg = _cupsGlobals();
 153
 154     if (!cg->lang_default)
 155       cg->lang_default = cupsLangDefault();
 156
 157     snprintf(prompt, sizeof(prompt),
 158              _cupsLangString(cg->lang_default, _("Password for %s on %s? ")),
 159              cupsUser(),
 160              http->hostname[0] == '/' ? "localhost" : http->hostname);
 161
 162     http->digest_tries  = strncasecmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE],
 163                                       "Digest", 5) != 0;
 164     http->userpass[0]   = '\0';
 165
 166     if ((password = cupsGetPassword2(prompt, http, method, resource)) == NULL)
 167     {
 168       http->status = HTTP_AUTHORIZATION_CANCELED;
 169       return (-1);
 170     }
 171
 172     if (!password[0])
 173     {
 174       http->status = HTTP_AUTHORIZATION_CANCELED;
 175       return (-1);
 176     }
 177
 178     snprintf(http->userpass, sizeof(http->userpass), "%s:%s", cupsUser(),
 179              password);
 180   }
 181   else if (http->status == HTTP_UNAUTHORIZED)
 182     http->digest_tries ++;
 183
 184  /*
 185   * Got a password; encode it for the server...
 186   */
 187
 188   if (!strncmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Negotiate", 9))
 189   {
 190 #ifdef HAVE_GSSAPI
 191    /*
 192     * Kerberos authentication...
 193     */
 194
 195     OM_uint32           minor_status,   /* Minor status code */
 196                         major_status;   /* Major status code */
 197     gss_buffer_desc     output_token = GSS_C_EMPTY_BUFFER,
 198                                         /* Output token */
 199                         input_token = GSS_C_EMPTY_BUFFER;
 200                                         /* Input token */
 201     char                *gss_service_name;
 202                                         /* GSS service name */
 203 #  ifdef USE_SPNEGO
 204     const char          *authorization;
 205                                         /* Pointer into Authorization string */
 206 #  endif /* USE_SPNEGO */
 207
 208
 209 #  ifdef __APPLE__
 210    /*
 211     * If the weak-linked GSSAPI/Kerberos library is not present, don't try
 212     * to use it...
 213     */
 214
 215     if (gss_init_sec_context == NULL)
 216     {
 217       DEBUG_puts("1cupsDoAuthentication: Weak-linked GSSAPI/Kerberos framework "
 218                  "is not present");
 219       http->status = HTTP_AUTHORIZATION_CANCELED;
 220
 221       return (-1);
 222     }
 223 #  endif /* __APPLE__ */
 224
 225     if (http->status == HTTP_UNAUTHORIZED && http->digest_tries >= 3)
 226     {
 227       DEBUG_printf(("1cupsDoAuthentication: too many Negotiate tries (%d)",
 228                     http->digest_tries));
 229       http->status = HTTP_AUTHORIZATION_CANCELED;
 230
 231       return (-1);
 232     }
 233
 234     if (http->gssname == GSS_C_NO_NAME)
 235     {
 236       if ((gss_service_name = getenv("CUPS_GSSSERVICENAME")) == NULL)
 237         gss_service_name = CUPS_DEFAULT_GSSSERVICENAME;
 238       else
 239         DEBUG_puts("2cupsDoAuthentication: GSS service name set via "
 240                    "environment variable");
 241
 242       http->gssname = cups_get_gssname(http, gss_service_name);
 243     }
 244
 245 #  ifdef USE_SPNEGO /* We don't implement SPNEGO just yet... */
 246    /*
 247     * Find the start of the Kerberos input token...
 248     */
 249
 250     authorization = httpGetField(http, HTTP_FIELD_WWW_AUTHENTICATE);
 251
 252     authorization += 9;
 253     while (*authorization && isspace(*authorization & 255))
 254       authorization ++;
 255
 256     if (*authorization)
 257     {
 258      /*
 259       * Decode the authorization string to get the input token...
 260       */
 261
 262       int len = strlen(authorization);
 263
 264       input_token.value  = malloc(len);
 265       input_token.value  = httpDecode64_2(input_token.value, &len,
 266                                           authorization);
 267       input_token.length = len;
 268
 269 #    ifdef DEBUG
 270       {
 271         char *ptr = (char *)input_token.value;
 272         int left = len;
 273
 274         fputs("input_token=", stdout);
 275         while (left > 0)
 276         {
 277           if (*ptr < ' ')
 278             printf("\\%03o", *ptr & 255);
 279           else
 280             putchar(*ptr);
 281           ptr ++;
 282           left --;
 283         }
 284         putchar('\n');
 285       }
 286 #    endif /* DEBUG */
 287     }
 288 #  endif /* USE_SPNEGO */
 289
 290     if (http->gssctx != GSS_C_NO_CONTEXT)
 291     {
 292       gss_delete_sec_context(&minor_status, &http->gssctx, GSS_C_NO_BUFFER);
 293       http->gssctx = GSS_C_NO_CONTEXT;
 294     }
 295
 296     major_status  = gss_init_sec_context(&minor_status, GSS_C_NO_CREDENTIAL,
 297                                          &http->gssctx,
 298                                          http->gssname, http->gssmech,
 299 #ifdef GSS_C_DELEG_POLICY_FLAG
 300                                          GSS_C_DELEG_POLICY_FLAG |
 301 #endif /* GSS_C_DELEG_POLICY_FLAG */
 302                                          GSS_C_MUTUAL_FLAG | GSS_C_INTEG_FLAG,
 303                                          GSS_C_INDEFINITE,
 304                                          GSS_C_NO_CHANNEL_BINDINGS,
 305                                          &input_token, &http->gssmech,
 306                                          &output_token, NULL, NULL);
 307
 308     if (input_token.value)
 309       free(input_token.value);
 310
 311     if (GSS_ERROR(major_status))
 312     {
 313       cups_gss_printf(major_status, minor_status,
 314                       "cupsDoAuthentication: Unable to initialize security "
 315                       "context");
 316       http->status = HTTP_AUTHORIZATION_CANCELED;
 317
 318       return (-1);
 319     }
 320
 321     if (major_status == GSS_S_CONTINUE_NEEDED)
 322       cups_gss_printf(major_status, minor_status,
 323                       "cupsDoAuthentication: Continuation needed!");
 324
 325     if (output_token.length > 0 && output_token.length <= 65536)
 326     {
 327      /*
 328       * Allocate the authorization string since Windows KDCs can have
 329       * arbitrarily large credentials...
 330       */
 331
 332       int authsize = 10 +                               /* "Negotiate " */
 333                      output_token.length * 4 / 3 + 1 +  /* Base64 */
 334                      1;                                 /* nul */
 335
 336       httpSetAuthString(http, NULL, NULL);
 337
 338       if ((http->authstring = malloc(authsize)) == NULL)
 339       {
 340         http->authstring = http->_authstring;
 341         authsize         = sizeof(http->_authstring);
 342       }
 343
 344       strcpy(http->authstring, "Negotiate ");
 345       httpEncode64_2(http->authstring + 10, authsize - 10, output_token.value,
 346                      output_token.length);
 347
 348       gss_release_buffer(&minor_status, &output_token);
 349     }
 350     else
 351     {
 352       DEBUG_printf(("1cupsDoAuthentication: Kerberos credentials too large - "
 353                     "%d bytes!", (int)output_token.length));
 354       http->status = HTTP_AUTHORIZATION_CANCELED;
 355       gss_release_buffer(&minor_status, &output_token);
 356
 357       return (-1);
 358     }
 359 #endif /* HAVE_GSSAPI */
 360   }
 361   else if (strncmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Digest", 6))
 362   {
 363    /*
 364     * Basic authentication...
 365     */
 366
 367     char        encode[256];            /* Base64 buffer */
 368
 369
 370     httpEncode64_2(encode, sizeof(encode), http->userpass,
 371                    (int)strlen(http->userpass));
 372     httpSetAuthString(http, "Basic", encode);
 373   }
 374   else
 375   {
 376    /*
 377     * Digest authentication...
 378     */
 379
 380     char        encode[33],             /* MD5 buffer */
 381                 digest[1024];           /* Digest auth data */
 382
 383
 384     httpGetSubField(http, HTTP_FIELD_WWW_AUTHENTICATE, "realm", realm);
 385     httpGetSubField(http, HTTP_FIELD_WWW_AUTHENTICATE, "nonce", nonce);
 386
 387     httpMD5(cupsUser(), realm, strchr(http->userpass, ':') + 1, encode);
 388     httpMD5Final(nonce, method, resource, encode);
 389     snprintf(digest, sizeof(digest),
 390              "username=\"%s\", realm=\"%s\", nonce=\"%s\", uri=\"%s\", "
 391              "response=\"%s\"", cupsUser(), realm, nonce, resource, encode);
 392     httpSetAuthString(http, "Digest", digest);
 393   }
 394
 395   DEBUG_printf(("1cupsDoAuthentication: authstring=\"%s\"", http->authstring));
 396
 397   return (0);
 398 }
 399
 400
 401 #ifdef HAVE_GSSAPI
 402 /*
 403  * 'cups_get_gssname()' - Get CUPS service credentials for authentication.
 404  */
 405
 406 static gss_name_t                       /* O - Server name */
 407 cups_get_gssname(
 408     http_t     *http,                   /* I - Connection to server */
 409     const char *service_name)           /* I - Service name */
 410 {
 411   gss_buffer_desc token = GSS_C_EMPTY_BUFFER;
 412                                         /* Service token */
 413   OM_uint32       major_status,         /* Major status code */
 414                   minor_status;         /* Minor status code */
 415   gss_name_t      server_name;          /* Server name */
 416   char            buf[1024],            /* Name buffer */
 417                   fqdn[HTTP_MAX_URI];   /* Server name buffer */
 418
 419
 420   DEBUG_printf(("7cups_get_gssname(http=%p, service_name=\"%s\")", http,
 421                 service_name));
 422
 423
 424  /*
 425   * Get the hostname...
 426   */
 427
 428   httpGetHostname(http, fqdn, sizeof(fqdn));
 429
 430   if (!strcmp(fqdn, "localhost"))
 431     httpGetHostname(NULL, fqdn, sizeof(fqdn));
 432
 433  /*
 434   * Get a server name we can use for authentication purposes...
 435   */
 436
 437   snprintf(buf, sizeof(buf), "%s@%s", service_name, fqdn);
 438
 439   DEBUG_printf(("9cups_get_gssname: Looking up %s...", buf));
 440
 441   token.value  = buf;
 442   token.length = strlen(buf);
 443   server_name  = GSS_C_NO_NAME;
 444   major_status = gss_import_name(&minor_status, &token,
 445                                  GSS_C_NT_HOSTBASED_SERVICE,
 446                                  &server_name);
 447
 448   if (GSS_ERROR(major_status))
 449   {
 450     cups_gss_printf(major_status, minor_status,
 451                     "cups_get_gssname: gss_import_name() failed");
 452     return (NULL);
 453   }
 454
 455   return (server_name);
 456 }
 457
 458
 459 #  ifdef DEBUG
 460 /*
 461  * 'cups_gss_printf()' - Show debug error messages from GSSAPI...
 462  */
 463
 464 static void
 465 cups_gss_printf(OM_uint32  major_status,/* I - Major status code */
 466                 OM_uint32  minor_status,/* I - Minor status code */
 467                 const char *message)    /* I - Prefix for error message */
 468 {
 469   OM_uint32     err_major_status,       /* Major status code for display */
 470                 err_minor_status;       /* Minor status code for display */
 471   OM_uint32     msg_ctx;                /* Message context */
 472   gss_buffer_desc major_status_string = GSS_C_EMPTY_BUFFER,
 473                                         /* Major status message */
 474                 minor_status_string = GSS_C_EMPTY_BUFFER;
 475                                         /* Minor status message */
 476
 477
 478   msg_ctx          = 0;
 479   err_major_status = gss_display_status(&err_minor_status,
 480                                         major_status,
 481                                         GSS_C_GSS_CODE,
 482                                         GSS_C_NO_OID,
 483                                         &msg_ctx,
 484                                         &major_status_string);
 485
 486   if (!GSS_ERROR(err_major_status))
 487     gss_display_status(&err_minor_status, minor_status, GSS_C_MECH_CODE,
 488                        GSS_C_NULL_OID, &msg_ctx, &minor_status_string);
 489
 490   DEBUG_printf(("1%s: %s, %s", message, (char *)major_status_string.value,
 491                 (char *)minor_status_string.value));
 492
 493   gss_release_buffer(&err_minor_status, &major_status_string);
 494   gss_release_buffer(&err_minor_status, &minor_status_string);
 495 }
 496 #  endif /* DEBUG */
 497 #endif /* HAVE_GSSAPI */
 498
 499
 500 /*
 501  * 'cups_local_auth()' - Get the local authorization certificate if
 502  *                       available/applicable...
 503  */
 504
 505 static int                              /* O - 0 if available */
 506                                         /*     1 if not available */
 507                                         /*    -1 error */
 508 cups_local_auth(http_t *http)           /* I - HTTP connection to server */
 509 {
 510 #if defined(WIN32) || defined(__EMX__)
 511  /*
 512   * Currently WIN32 and OS-2 do not support the CUPS server...
 513   */
 514
 515   return (1);
 516 #else
 517   int                   pid;            /* Current process ID */
 518   FILE                  *fp;            /* Certificate file */
 519   char                  trc[16],        /* Try Root Certificate parameter */
 520                         filename[1024], /* Certificate filename */
 521                         certificate[33];/* Certificate string */
 522   _cups_globals_t *cg = _cupsGlobals(); /* Global data */
 523 #  if defined(HAVE_AUTHORIZATION_H)
 524   OSStatus              status;         /* Status */
 525   AuthorizationItem     auth_right;     /* Authorization right */
 526   AuthorizationRights   auth_rights;    /* Authorization rights */
 527   AuthorizationFlags    auth_flags;     /* Authorization flags */
 528   AuthorizationExternalForm auth_extrn; /* Authorization ref external */
 529   char                  auth_key[1024]; /* Buffer */
 530   char                  buffer[1024];   /* Buffer */
 531 #  endif /* HAVE_AUTHORIZATION_H */
 532
 533
 534   DEBUG_printf(("7cups_local_auth(http=%p) hostaddr=%s, hostname=\"%s\"",
 535                 http, httpAddrString(http->hostaddr, filename, sizeof(filename)), http->hostname));
 536
 537  /*
 538   * See if we are accessing localhost...
 539   */
 540
 541   if (!httpAddrLocalhost(http->hostaddr) &&
 542       strcasecmp(http->hostname, "localhost") != 0)
 543   {
 544     DEBUG_puts("8cups_local_auth: Not a local connection!");
 545     return (1);
 546   }
 547
 548 #  if defined(HAVE_AUTHORIZATION_H)
 549  /*
 550   * Delete any previous authorization reference...
 551   */
 552
 553   if (http->auth_ref)
 554   {
 555     AuthorizationFree(http->auth_ref, kAuthorizationFlagDefaults);
 556     http->auth_ref = NULL;
 557   }
 558
 559   if (!getenv("GATEWAY_INTERFACE") &&
 560       httpGetSubField2(http, HTTP_FIELD_WWW_AUTHENTICATE, "authkey",
 561                        auth_key, sizeof(auth_key)))
 562   {
 563     status = AuthorizationCreate(NULL, kAuthorizationEmptyEnvironment,
 564                                  kAuthorizationFlagDefaults, &http->auth_ref);
 565     if (status != errAuthorizationSuccess)
 566     {
 567       DEBUG_printf(("8cups_local_auth: AuthorizationCreate() returned %d (%s)",
 568                     (int)status, cssmErrorString(status)));
 569       return (-1);
 570     }
 571
 572     auth_right.name        = auth_key;
 573     auth_right.valueLength = 0;
 574     auth_right.value       = NULL;
 575     auth_right.flags       = 0;
 576
 577     auth_rights.count = 1;
 578     auth_rights.items = &auth_right;
 579
 580     auth_flags = kAuthorizationFlagDefaults |
 581                  kAuthorizationFlagPreAuthorize |
 582                  kAuthorizationFlagInteractionAllowed |
 583                  kAuthorizationFlagExtendRights;
 584
 585     status = AuthorizationCopyRights(http->auth_ref, &auth_rights,
 586                                      kAuthorizationEmptyEnvironment,
 587                                      auth_flags, NULL);
 588     if (status == errAuthorizationSuccess)
 589       status = AuthorizationMakeExternalForm(http->auth_ref, &auth_extrn);
 590
 591     if (status == errAuthorizationSuccess)
 592     {
 593      /*
 594       * Set the authorization string and return...
 595       */
 596
 597       httpEncode64_2(buffer, sizeof(buffer), (void *)&auth_extrn,
 598                      sizeof(auth_extrn));
 599
 600       httpSetAuthString(http, "AuthRef", buffer);
 601
 602       DEBUG_printf(("8cups_local_auth: Returning authstring=\"%s\"",
 603                     http->authstring));
 604       return (0);
 605     }
 606     else if (status == errAuthorizationCanceled)
 607       return (-1);
 608
 609     DEBUG_printf(("9cups_local_auth: AuthorizationCopyRights() returned %d (%s)",
 610                   (int)status, cssmErrorString(status)));
 611
 612   /*
 613    * Fall through to try certificates...
 614    */
 615   }
 616 #  endif /* HAVE_AUTHORIZATION_H */
 617
 618 #  if defined(SO_PEERCRED) && defined(AF_LOCAL)
 619  /*
 620   * See if we can authenticate using the peer credentials provided over a
 621   * domain socket; if so, specify "PeerCred username" as the authentication
 622   * information...
 623   */
 624
 625 #    ifdef HAVE_GSSAPI
 626   if (strncmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Negotiate", 9) &&
 627 #    else
 628   if (
 629 #    endif /* HAVE_GSSAPI */
 630       http->hostaddr->addr.sa_family == AF_LOCAL &&
 631       !getenv("GATEWAY_INTERFACE"))     /* Not via CGI programs... */
 632   {
 633    /*
 634     * Verify that the current cupsUser() matches the current UID...
 635     */
 636
 637     struct passwd       *pwd;           /* Password information */
 638     const char          *username;      /* Current username */
 639
 640     username = cupsUser();
 641
 642     if ((pwd = getpwnam(username)) != NULL && pwd->pw_uid == getuid())
 643     {
 644       httpSetAuthString(http, "PeerCred", username);
 645
 646       DEBUG_printf(("8cups_local_auth: Returning authstring=\"%s\"",
 647                     http->authstring));
 648
 649       return (0);
 650     }
 651   }
 652 #  endif /* SO_PEERCRED && AF_LOCAL */
 653
 654  /*
 655   * Try opening a certificate file for this PID.  If that fails,
 656   * try the root certificate...
 657   */
 658
 659   pid = getpid();
 660   snprintf(filename, sizeof(filename), "%s/certs/%d", cg->cups_statedir, pid);
 661   if ((fp = fopen(filename, "r")) == NULL && pid > 0)
 662   {
 663    /*
 664     * No certificate for this PID; see if we can get the root certificate...
 665     */
 666
 667     DEBUG_printf(("9cups_local_auth: Unable to open file %s: %s",
 668                   filename, strerror(errno)));
 669
 670 #ifdef HAVE_GSSAPI
 671     if (!strncmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Negotiate", 9))
 672     {
 673      /*
 674       * Kerberos required, don't try the root certificate...
 675       */
 676
 677       return (1);
 678     }
 679 #endif /* HAVE_GSSAPI */
 680
 681     if (!httpGetSubField2(http, HTTP_FIELD_WWW_AUTHENTICATE, "trc", trc,
 682                           sizeof(trc)))
 683     {
 684      /*
 685       * Scheduler doesn't want us to use the root certificate...
 686       */
 687
 688       return (1);
 689     }
 690
 691     snprintf(filename, sizeof(filename), "%s/certs/0", cg->cups_statedir);
 692     fp = fopen(filename, "r");
 693   }
 694
 695   if (fp)
 696   {
 697    /*
 698     * Read the certificate from the file...
 699     */
 700
 701     fgets(certificate, sizeof(certificate), fp);
 702     fclose(fp);
 703
 704    /*
 705     * Set the authorization string and return...
 706     */
 707
 708     httpSetAuthString(http, "Local", certificate);
 709
 710     DEBUG_printf(("8cups_local_auth: Returning authstring=\"%s\"",
 711                   http->authstring));
 712
 713     return (0);
 714   }
 715
 716   return (1);
 717 #endif /* WIN32 || __EMX__ */
 718 }
 719
 720
 721 /*
 722  * End of "$Id: auth.c 7720 2008-07-11 22:46:21Z mike $".
 723  */