cups/auth.c

   1 /*
   2  * "$Id$"
   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  *   _cupsSetNegotiateAuthString() - Set the Kerberos authentication string.
  24  *   cups_gss_acquire()            - Kerberos credentials callback.
  25  *   cups_gss_getname()            - Get CUPS service credentials for
  26  *                                   authentication.
  27  *   cups_gss_printf()             - Show debug error messages from GSSAPI.
  28  *   cups_local_auth()             - Get the local authorization certificate if
  29  *                                   available/applicable.
  30  */
  31
  32 /*
  33  * Include necessary headers...
  34  */
  35
  36 #include "cups-private.h"
  37 #include <fcntl.h>
  38 #include <sys/stat.h>
  39 #if defined(WIN32) || defined(__EMX__)
  40 #  include <io.h>
  41 #else
  42 #  include <unistd.h>
  43 #endif /* WIN32 || __EMX__ */
  44
  45 #if HAVE_AUTHORIZATION_H
  46 #  include <Security/Authorization.h>
  47 #  ifdef HAVE_SECBASEPRIV_H
  48 #    include <Security/SecBasePriv.h>
  49 #  else
  50 extern const char *cssmErrorString(int error);
  51 #  endif /* HAVE_SECBASEPRIV_H */
  52 #endif /* HAVE_AUTHORIZATION_H */
  53
  54 #if defined(SO_PEERCRED) && defined(AF_LOCAL)
  55 #  include <pwd.h>
  56 #endif /* SO_PEERCRED && AF_LOCAL */
  57
  58
  59 /*
  60  * Local functions...
  61  */
  62
  63 #ifdef HAVE_GSSAPI
  64 #  ifdef HAVE_GSS_ACQUIRE_CRED_EX_F
  65 #    ifdef HAVE_GSS_GSSAPI_SPI_H
  66 #      include <GSS/gssapi_spi.h>
  67 #    else
  68 typedef struct gss_auth_identity
  69 {
  70   uint32_t type;
  71   uint32_t flags;
  72   char *username;
  73   char *realm;
  74   char *password;
  75   gss_buffer_t *credentialsRef;
  76 } gss_auth_identity_desc;
  77 extern OM_uint32 gss_acquire_cred_ex_f(gss_status_id_t, const gss_name_t,
  78                                        OM_uint32, OM_uint32, const gss_OID,
  79                                        gss_cred_usage_t, gss_auth_identity_t,
  80                                        void *, void (*)(void *, OM_uint32,
  81                                                         gss_status_id_t,
  82                                                         gss_cred_id_t,
  83                                                         gss_OID_set,
  84                                                         OM_uint32));
  85 #    endif /* HAVE_GSS_GSSAPI_SPI_H */
  86 #    include <dispatch/dispatch.h>
  87 typedef struct _cups_gss_acquire_s      /* Acquire callback data */
  88 {
  89   dispatch_semaphore_t  sem;            /* Synchronization semaphore */
  90   OM_uint32             major;          /* Returned status code */
  91   gss_cred_id_t         creds;          /* Returned credentials */
  92 } _cups_gss_acquire_t;
  93
  94 static void     cups_gss_acquire(void *ctx, OM_uint32 major,
  95                                  gss_status_id_t status,
  96                                  gss_cred_id_t creds, gss_OID_set oids,
  97                                  OM_uint32 time_rec);
  98 #  endif /* HAVE_GSS_ACQUIRE_CRED_EX_F */
  99 static gss_name_t cups_gss_getname(http_t *http, const char *service_name);
 100 #  ifdef DEBUG
 101 static void     cups_gss_printf(OM_uint32 major_status, OM_uint32 minor_status,
 102                                 const char *message);
 103 #  else
 104 #    define     cups_gss_printf(major, minor, message)
 105 #  endif /* DEBUG */
 106 #endif /* HAVE_GSSAPI */
 107 static int      cups_local_auth(http_t *http);
 108
 109
 110 /*
 111  * 'cupsDoAuthentication()' - Authenticate a request.
 112  *
 113  * This function should be called in response to a @code HTTP_UNAUTHORIZED@
 114  * status, prior to resubmitting your request.
 115  *
 116  * @since CUPS 1.1.20/Mac OS X 10.4@
 117  */
 118
 119 int                                     /* O - 0 on success, -1 on error */
 120 cupsDoAuthentication(
 121     http_t     *http,                   /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
 122     const char *method,                 /* I - Request method ("GET", "POST", "PUT") */
 123     const char *resource)               /* I - Resource path */
 124 {
 125   const char    *password;              /* Password string */
 126   char          prompt[1024],           /* Prompt for user */
 127                 realm[HTTP_MAX_VALUE],  /* realm="xyz" string */
 128                 nonce[HTTP_MAX_VALUE];  /* nonce="xyz" string */
 129   int           localauth;              /* Local authentication result */
 130   _cups_globals_t *cg;                  /* Global data */
 131
 132
 133   DEBUG_printf(("cupsDoAuthentication(http=%p, method=\"%s\", resource=\"%s\")",
 134                 http, method, resource));
 135
 136   if (!http)
 137     http = _cupsConnect();
 138
 139   if (!http || !method || !resource)
 140     return (-1);
 141
 142   DEBUG_printf(("2cupsDoAuthentication: digest_tries=%d, userpass=\"%s\"",
 143                 http->digest_tries, http->userpass));
 144   DEBUG_printf(("2cupsDoAuthentication: WWW-Authenticate=\"%s\"",
 145                 httpGetField(http, HTTP_FIELD_WWW_AUTHENTICATE)));
 146
 147  /*
 148   * Clear the current authentication string...
 149   */
 150
 151   httpSetAuthString(http, NULL, NULL);
 152
 153  /*
 154   * See if we can do local authentication...
 155   */
 156
 157   if (http->digest_tries < 3)
 158   {
 159     if ((localauth = cups_local_auth(http)) == 0)
 160     {
 161       DEBUG_printf(("2cupsDoAuthentication: authstring=\"%s\"",
 162                     http->authstring));
 163
 164       if (http->status == HTTP_UNAUTHORIZED)
 165         http->digest_tries ++;
 166
 167       return (0);
 168     }
 169     else if (localauth == -1)
 170     {
 171       http->status = HTTP_AUTHORIZATION_CANCELED;
 172       return (-1);                      /* Error or canceled */
 173     }
 174   }
 175
 176  /*
 177   * Nope, see if we should retry the current username:password...
 178   */
 179
 180   if ((http->digest_tries > 1 || !http->userpass[0]) &&
 181       (!strncmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Basic", 5) ||
 182        !strncmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Digest", 6)))
 183   {
 184    /*
 185     * Nope - get a new password from the user...
 186     */
 187
 188     cg = _cupsGlobals();
 189
 190     if (!cg->lang_default)
 191       cg->lang_default = cupsLangDefault();
 192
 193     snprintf(prompt, sizeof(prompt),
 194              _cupsLangString(cg->lang_default, _("Password for %s on %s? ")),
 195              cupsUser(),
 196              http->hostname[0] == '/' ? "localhost" : http->hostname);
 197
 198     http->digest_tries  = strncasecmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE],
 199                                       "Digest", 5) != 0;
 200     http->userpass[0]   = '\0';
 201
 202     if ((password = cupsGetPassword2(prompt, http, method, resource)) == NULL)
 203     {
 204       http->status = HTTP_AUTHORIZATION_CANCELED;
 205       return (-1);
 206     }
 207
 208     snprintf(http->userpass, sizeof(http->userpass), "%s:%s", cupsUser(),
 209              password);
 210   }
 211   else if (http->status == HTTP_UNAUTHORIZED)
 212     http->digest_tries ++;
 213
 214   if (http->status == HTTP_UNAUTHORIZED && http->digest_tries >= 3)
 215   {
 216     DEBUG_printf(("1cupsDoAuthentication: Too many authentication tries (%d)",
 217                   http->digest_tries));
 218
 219     http->status = HTTP_AUTHORIZATION_CANCELED;
 220     return (-1);
 221   }
 222
 223  /*
 224   * Got a password; encode it for the server...
 225   */
 226
 227 #ifdef HAVE_GSSAPI
 228   if (!strncmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Negotiate", 9))
 229   {
 230    /*
 231     * Kerberos authentication...
 232     */
 233
 234     if (_cupsSetNegotiateAuthString(http, method, resource))
 235     {
 236       http->status = HTTP_AUTHORIZATION_CANCELED;
 237       return (-1);
 238     }
 239   }
 240   else
 241 #endif /* HAVE_GSSAPI */
 242   if (!strncmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Basic", 5))
 243   {
 244    /*
 245     * Basic authentication...
 246     */
 247
 248     char        encode[256];            /* Base64 buffer */
 249
 250
 251     httpEncode64_2(encode, sizeof(encode), http->userpass,
 252                    (int)strlen(http->userpass));
 253     httpSetAuthString(http, "Basic", encode);
 254   }
 255   else if (!strncmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Digest", 6))
 256   {
 257    /*
 258     * Digest authentication...
 259     */
 260
 261     char        encode[33],             /* MD5 buffer */
 262                 digest[1024];           /* Digest auth data */
 263
 264
 265     httpGetSubField(http, HTTP_FIELD_WWW_AUTHENTICATE, "realm", realm);
 266     httpGetSubField(http, HTTP_FIELD_WWW_AUTHENTICATE, "nonce", nonce);
 267
 268     httpMD5(cupsUser(), realm, strchr(http->userpass, ':') + 1, encode);
 269     httpMD5Final(nonce, method, resource, encode);
 270     snprintf(digest, sizeof(digest),
 271              "username=\"%s\", realm=\"%s\", nonce=\"%s\", uri=\"%s\", "
 272              "response=\"%s\"", cupsUser(), realm, nonce, resource, encode);
 273     httpSetAuthString(http, "Digest", digest);
 274   }
 275   else
 276   {
 277     DEBUG_printf(("1cupsDoAuthentication: Unknown auth type: \"%s\"",
 278                   http->fields[HTTP_FIELD_WWW_AUTHENTICATE]));
 279     http->status = HTTP_AUTHORIZATION_CANCELED;
 280     return (-1);
 281   }
 282
 283   DEBUG_printf(("1cupsDoAuthentication: authstring=\"%s\"", http->authstring));
 284
 285   return (0);
 286 }
 287
 288
 289 #ifdef HAVE_GSSAPI
 290 /*
 291  * '_cupsSetNegotiateAuthString()' - Set the Kerberos authentication string.
 292  */
 293
 294 int                                     /* O - 0 on success, -1 on error */
 295 _cupsSetNegotiateAuthString(
 296     http_t     *http,                   /* I - Connection to server */
 297     const char *method,                 /* I - Request method ("GET", "POST", "PUT") */
 298     const char *resource)               /* I - Resource path */
 299 {
 300   OM_uint32     minor_status,           /* Minor status code */
 301                 major_status;           /* Major status code */
 302   gss_buffer_desc output_token = GSS_C_EMPTY_BUFFER;
 303                                         /* Output token */
 304
 305
 306 #  ifdef __APPLE__
 307  /*
 308   * If the weak-linked GSSAPI/Kerberos library is not present, don't try
 309   * to use it...
 310   */
 311
 312   if (gss_init_sec_context == NULL)
 313   {
 314     DEBUG_puts("1_cupsSetNegotiateAuthString: Weak-linked GSSAPI/Kerberos "
 315                "framework is not present");
 316     return (-1);
 317   }
 318 #  endif /* __APPLE__ */
 319
 320   if (http->gssname == GSS_C_NO_NAME)
 321   {
 322     http->gssname = cups_gss_getname(http, _cupsGSSServiceName());
 323   }
 324
 325   if (http->gssctx != GSS_C_NO_CONTEXT)
 326   {
 327     gss_delete_sec_context(&minor_status, &http->gssctx, GSS_C_NO_BUFFER);
 328     http->gssctx = GSS_C_NO_CONTEXT;
 329   }
 330
 331   major_status = gss_init_sec_context(&minor_status, GSS_C_NO_CREDENTIAL,
 332                                       &http->gssctx,
 333                                       http->gssname, http->gssmech,
 334                                       GSS_C_MUTUAL_FLAG | GSS_C_INTEG_FLAG,
 335                                       GSS_C_INDEFINITE,
 336                                       GSS_C_NO_CHANNEL_BINDINGS,
 337                                       GSS_C_NO_BUFFER, &http->gssmech,
 338                                       &output_token, NULL, NULL);
 339
 340 #ifdef HAVE_GSS_ACQUIRE_CRED_EX_F
 341   if (major_status == GSS_S_NO_CRED)
 342   {
 343    /*
 344     * Ask the user for credentials...
 345     */
 346
 347     char                prompt[1024],   /* Prompt for user */
 348                         userbuf[256];   /* Kerberos username */
 349     const char          *username,      /* Username string */
 350                         *password;      /* Password string */
 351     _cups_gss_acquire_t data;           /* Callback data */
 352     gss_auth_identity_desc identity;    /* Kerberos user identity */
 353     _cups_globals_t     *cg = _cupsGlobals();
 354                                         /* Per-thread global data */
 355
 356     if (!cg->lang_default)
 357       cg->lang_default = cupsLangDefault();
 358
 359     snprintf(prompt, sizeof(prompt),
 360              _cupsLangString(cg->lang_default, _("Password for %s on %s? ")),
 361              cupsUser(), http->gssname);
 362
 363     if ((password = cupsGetPassword2(prompt, http, method, resource)) == NULL)
 364       return (-1);
 365
 366    /*
 367     * Try to acquire credentials...
 368     */
 369
 370     username = cupsUser();
 371     if (!strchr(username, '@'))
 372     {
 373       snprintf(userbuf, sizeof(userbuf), "%s@%s", username, http->gssname);
 374       username = userbuf;
 375     }
 376
 377     identity.type           = GSS_AUTH_IDENTITY_TYPE_1;
 378     identity.flags          = 0;
 379     identity.username       = (char *)username;
 380     identity.realm          = (char *)"";
 381     identity.password       = (char *)password;
 382     identity.credentialsRef = NULL;
 383
 384     data.sem   = dispatch_semaphore_create(0);
 385     data.major = 0;
 386     data.creds = NULL;
 387
 388     if (data.sem)
 389     {
 390       major_status = gss_acquire_cred_ex_f(NULL, GSS_C_NO_NAME, 0,
 391                                            GSS_C_INDEFINITE, GSS_KRB5_MECHANISM,
 392                                            GSS_C_INITIATE, &identity, &data,
 393                                            cups_gss_acquire);
 394
 395       if (major_status == GSS_S_COMPLETE)
 396       {
 397         dispatch_semaphore_wait(data.sem, DISPATCH_TIME_FOREVER);
 398         major_status = data.major;
 399       }
 400
 401       dispatch_release(data.sem);
 402
 403       if (major_status == GSS_S_COMPLETE)
 404       {
 405         OM_uint32       release_minor;  /* Minor status from releasing creds */
 406
 407         major_status = gss_init_sec_context(&minor_status, data.creds,
 408                                             &http->gssctx,
 409                                             http->gssname, http->gssmech,
 410                                             GSS_C_MUTUAL_FLAG | GSS_C_INTEG_FLAG,
 411                                             GSS_C_INDEFINITE,
 412                                             GSS_C_NO_CHANNEL_BINDINGS,
 413                                             GSS_C_NO_BUFFER, &http->gssmech,
 414                                             &output_token, NULL, NULL);
 415         gss_release_cred(&release_minor, &data.creds);
 416       }
 417     }
 418   }
 419   else
 420 #endif /* HAVE_GSS_ACQUIRED_CRED_EX_F */
 421
 422   if (GSS_ERROR(major_status))
 423   {
 424     cups_gss_printf(major_status, minor_status,
 425                     "_cupsSetNegotiateAuthString: Unable to initialize "
 426                     "security context");
 427     return (-1);
 428   }
 429
 430 #ifdef DEBUG
 431   else if (major_status == GSS_S_CONTINUE_NEEDED)
 432     cups_gss_printf(major_status, minor_status,
 433                     "_cupsSetNegotiateAuthString: Continuation needed!");
 434 #endif /* DEBUG */
 435
 436   if (output_token.length > 0 && output_token.length <= 65536)
 437   {
 438    /*
 439     * Allocate the authorization string since Windows KDCs can have
 440     * arbitrarily large credentials...
 441     */
 442
 443     int authsize = 10 +                         /* "Negotiate " */
 444                    output_token.length * 4 / 3 + 1 +    /* Base64 */
 445                    1;                                   /* nul */
 446
 447     httpSetAuthString(http, NULL, NULL);
 448
 449     if ((http->authstring = malloc(authsize)) == NULL)
 450     {
 451       http->authstring = http->_authstring;
 452       authsize         = sizeof(http->_authstring);
 453     }
 454
 455     strcpy(http->authstring, "Negotiate ");
 456     httpEncode64_2(http->authstring + 10, authsize - 10, output_token.value,
 457                    output_token.length);
 458
 459     gss_release_buffer(&minor_status, &output_token);
 460   }
 461   else
 462   {
 463     DEBUG_printf(("1_cupsSetNegotiateAuthString: Kerberos credentials too "
 464                   "large - %d bytes!", (int)output_token.length));
 465     gss_release_buffer(&minor_status, &output_token);
 466
 467     return (-1);
 468   }
 469
 470   return (0);
 471 }
 472
 473
 474 #  ifdef HAVE_GSS_ACQUIRE_CRED_EX_F
 475 /*
 476  * 'cups_gss_acquire()' - Kerberos credentials callback.
 477  */
 478 static void
 479 cups_gss_acquire(
 480     void            *ctx,               /* I - Caller context */
 481     OM_uint32       major,              /* I - Major error code */
 482     gss_status_id_t status,             /* I - Status (unused) */
 483     gss_cred_id_t   creds,              /* I - Credentials (if any) */
 484     gss_OID_set     oids,               /* I - Mechanism OIDs (unused) */
 485     OM_uint32       time_rec)           /* I - Timestamp (unused) */
 486 {
 487   uint32_t              min;            /* Minor error code */
 488   _cups_gss_acquire_t   *data;          /* Callback data */
 489
 490
 491   (void)status;
 492   (void)time_rec;
 493
 494   data        = (_cups_gss_acquire_t *)ctx;
 495   data->major = major;
 496   data->creds = creds;
 497
 498   gss_release_oid_set(&min, &oids);
 499   dispatch_semaphore_signal(data->sem);
 500 }
 501 #  endif /* HAVE_GSS_ACQUIRE_CRED_EX_F */
 502
 503
 504 /*
 505  * 'cups_gss_getname()' - Get CUPS service credentials for authentication.
 506  */
 507
 508 static gss_name_t                       /* O - Server name */
 509 cups_gss_getname(
 510     http_t     *http,                   /* I - Connection to server */
 511     const char *service_name)           /* I - Service name */
 512 {
 513   gss_buffer_desc token = GSS_C_EMPTY_BUFFER;
 514                                         /* Service token */
 515   OM_uint32       major_status,         /* Major status code */
 516                   minor_status;         /* Minor status code */
 517   gss_name_t      server_name;          /* Server name */
 518   char            buf[1024];            /* Name buffer */
 519
 520
 521   DEBUG_printf(("7cups_gss_getname(http=%p, service_name=\"%s\")", http,
 522                 service_name));
 523
 524
 525  /*
 526   * Get the hostname...
 527   */
 528
 529   if (!http->gsshost[0])
 530   {
 531     httpGetHostname(http, http->gsshost, sizeof(http->gsshost));
 532
 533     if (!strcmp(http->gsshost, "localhost"))
 534     {
 535       if (gethostname(http->gsshost, sizeof(http->gsshost)) < 0)
 536       {
 537         DEBUG_printf(("1cups_gss_getname: gethostname() failed: %s",
 538                       strerror(errno)));
 539         http->gsshost[0] = '\0';
 540         return (NULL);
 541       }
 542
 543       if (!strchr(http->gsshost, '.'))
 544       {
 545        /*
 546         * The hostname is not a FQDN, so look it up...
 547         */
 548
 549         struct hostent  *host;          /* Host entry to get FQDN */
 550
 551         if ((host = gethostbyname(http->gsshost)) != NULL && host->h_name)
 552         {
 553          /*
 554           * Use the resolved hostname...
 555           */
 556
 557           strlcpy(http->gsshost, host->h_name, sizeof(http->gsshost));
 558         }
 559         else
 560         {
 561           DEBUG_printf(("1cups_gss_getname: gethostbyname(\"%s\") failed.",
 562                         http->gsshost));
 563           http->gsshost[0] = '\0';
 564           return (NULL);
 565         }
 566       }
 567     }
 568   }
 569
 570  /*
 571   * Get a service name we can use for authentication purposes...
 572   */
 573
 574   snprintf(buf, sizeof(buf), "%s@%s", service_name, http->gsshost);
 575
 576   DEBUG_printf(("8cups_gss_getname: Looking up \"%s\".", buf));
 577
 578   token.value  = buf;
 579   token.length = strlen(buf);
 580   server_name  = GSS_C_NO_NAME;
 581   major_status = gss_import_name(&minor_status, &token,
 582                                  GSS_C_NT_HOSTBASED_SERVICE,
 583                                  &server_name);
 584
 585   if (GSS_ERROR(major_status))
 586   {
 587     cups_gss_printf(major_status, minor_status,
 588                     "cups_gss_getname: gss_import_name() failed");
 589     return (NULL);
 590   }
 591
 592   return (server_name);
 593 }
 594
 595
 596 #  ifdef DEBUG
 597 /*
 598  * 'cups_gss_printf()' - Show debug error messages from GSSAPI.
 599  */
 600
 601 static void
 602 cups_gss_printf(OM_uint32  major_status,/* I - Major status code */
 603                 OM_uint32  minor_status,/* I - Minor status code */
 604                 const char *message)    /* I - Prefix for error message */
 605 {
 606   OM_uint32     err_major_status,       /* Major status code for display */
 607                 err_minor_status;       /* Minor status code for display */
 608   OM_uint32     msg_ctx;                /* Message context */
 609   gss_buffer_desc major_status_string = GSS_C_EMPTY_BUFFER,
 610                                         /* Major status message */
 611                 minor_status_string = GSS_C_EMPTY_BUFFER;
 612                                         /* Minor status message */
 613
 614
 615   msg_ctx          = 0;
 616   err_major_status = gss_display_status(&err_minor_status,
 617                                         major_status,
 618                                         GSS_C_GSS_CODE,
 619                                         GSS_C_NO_OID,
 620                                         &msg_ctx,
 621                                         &major_status_string);
 622
 623   if (!GSS_ERROR(err_major_status))
 624     gss_display_status(&err_minor_status, minor_status, GSS_C_MECH_CODE,
 625                        GSS_C_NULL_OID, &msg_ctx, &minor_status_string);
 626
 627   DEBUG_printf(("1%s: %s, %s", message, (char *)major_status_string.value,
 628                 (char *)minor_status_string.value));
 629
 630   gss_release_buffer(&err_minor_status, &major_status_string);
 631   gss_release_buffer(&err_minor_status, &minor_status_string);
 632 }
 633 #  endif /* DEBUG */
 634 #endif /* HAVE_GSSAPI */
 635
 636
 637 /*
 638  * 'cups_local_auth()' - Get the local authorization certificate if
 639  *                       available/applicable.
 640  */
 641
 642 static int                              /* O - 0 if available */
 643                                         /*     1 if not available */
 644                                         /*    -1 error */
 645 cups_local_auth(http_t *http)           /* I - HTTP connection to server */
 646 {
 647 #if defined(WIN32) || defined(__EMX__)
 648  /*
 649   * Currently WIN32 and OS-2 do not support the CUPS server...
 650   */
 651
 652   return (1);
 653 #else
 654   int                   pid;            /* Current process ID */
 655   FILE                  *fp;            /* Certificate file */
 656   char                  trc[16],        /* Try Root Certificate parameter */
 657                         filename[1024], /* Certificate filename */
 658                         certificate[33];/* Certificate string */
 659   _cups_globals_t *cg = _cupsGlobals(); /* Global data */
 660 #  if defined(HAVE_AUTHORIZATION_H)
 661   OSStatus              status;         /* Status */
 662   AuthorizationItem     auth_right;     /* Authorization right */
 663   AuthorizationRights   auth_rights;    /* Authorization rights */
 664   AuthorizationFlags    auth_flags;     /* Authorization flags */
 665   AuthorizationExternalForm auth_extrn; /* Authorization ref external */
 666   char                  auth_key[1024]; /* Buffer */
 667   char                  buffer[1024];   /* Buffer */
 668 #  endif /* HAVE_AUTHORIZATION_H */
 669
 670
 671   DEBUG_printf(("7cups_local_auth(http=%p) hostaddr=%s, hostname=\"%s\"",
 672                 http, httpAddrString(http->hostaddr, filename, sizeof(filename)), http->hostname));
 673
 674  /*
 675   * See if we are accessing localhost...
 676   */
 677
 678   if (!httpAddrLocalhost(http->hostaddr) &&
 679       strcasecmp(http->hostname, "localhost") != 0)
 680   {
 681     DEBUG_puts("8cups_local_auth: Not a local connection!");
 682     return (1);
 683   }
 684
 685 #  if defined(HAVE_AUTHORIZATION_H)
 686  /*
 687   * Delete any previous authorization reference...
 688   */
 689
 690   if (http->auth_ref)
 691   {
 692     AuthorizationFree(http->auth_ref, kAuthorizationFlagDefaults);
 693     http->auth_ref = NULL;
 694   }
 695
 696   if (!getenv("GATEWAY_INTERFACE") &&
 697       httpGetSubField2(http, HTTP_FIELD_WWW_AUTHENTICATE, "authkey",
 698                        auth_key, sizeof(auth_key)))
 699   {
 700     status = AuthorizationCreate(NULL, kAuthorizationEmptyEnvironment,
 701                                  kAuthorizationFlagDefaults, &http->auth_ref);
 702     if (status != errAuthorizationSuccess)
 703     {
 704       DEBUG_printf(("8cups_local_auth: AuthorizationCreate() returned %d (%s)",
 705                     (int)status, cssmErrorString(status)));
 706       return (-1);
 707     }
 708
 709     auth_right.name        = auth_key;
 710     auth_right.valueLength = 0;
 711     auth_right.value       = NULL;
 712     auth_right.flags       = 0;
 713
 714     auth_rights.count = 1;
 715     auth_rights.items = &auth_right;
 716
 717     auth_flags = kAuthorizationFlagDefaults |
 718                  kAuthorizationFlagPreAuthorize |
 719                  kAuthorizationFlagInteractionAllowed |
 720                  kAuthorizationFlagExtendRights;
 721
 722     status = AuthorizationCopyRights(http->auth_ref, &auth_rights,
 723                                      kAuthorizationEmptyEnvironment,
 724                                      auth_flags, NULL);
 725     if (status == errAuthorizationSuccess)
 726       status = AuthorizationMakeExternalForm(http->auth_ref, &auth_extrn);
 727
 728     if (status == errAuthorizationSuccess)
 729     {
 730      /*
 731       * Set the authorization string and return...
 732       */
 733
 734       httpEncode64_2(buffer, sizeof(buffer), (void *)&auth_extrn,
 735                      sizeof(auth_extrn));
 736
 737       httpSetAuthString(http, "AuthRef", buffer);
 738
 739       DEBUG_printf(("8cups_local_auth: Returning authstring=\"%s\"",
 740                     http->authstring));
 741       return (0);
 742     }
 743     else if (status == errAuthorizationCanceled)
 744       return (-1);
 745
 746     DEBUG_printf(("9cups_local_auth: AuthorizationCopyRights() returned %d (%s)",
 747                   (int)status, cssmErrorString(status)));
 748
 749   /*
 750    * Fall through to try certificates...
 751    */
 752   }
 753 #  endif /* HAVE_AUTHORIZATION_H */
 754
 755 #  if defined(SO_PEERCRED) && defined(AF_LOCAL)
 756  /*
 757   * See if we can authenticate using the peer credentials provided over a
 758   * domain socket; if so, specify "PeerCred username" as the authentication
 759   * information...
 760   */
 761
 762   if (
 763 #    ifdef HAVE_GSSAPI
 764       strncmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Negotiate", 9) &&
 765 #    endif /* HAVE_GSSAPI */
 766 #    ifdef HAVE_AUTHORIZATION_H
 767       !httpGetSubField2(http, HTTP_FIELD_WWW_AUTHENTICATE, "authkey",
 768                         auth_key, sizeof(auth_key)) &&
 769 #    endif /* HAVE_AUTHORIZATION_H */
 770       http->hostaddr->addr.sa_family == AF_LOCAL &&
 771       !getenv("GATEWAY_INTERFACE"))     /* Not via CGI programs... */
 772   {
 773    /*
 774     * Verify that the current cupsUser() matches the current UID...
 775     */
 776
 777     struct passwd       *pwd;           /* Password information */
 778     const char          *username;      /* Current username */
 779
 780     username = cupsUser();
 781
 782     if ((pwd = getpwnam(username)) != NULL && pwd->pw_uid == getuid())
 783     {
 784       httpSetAuthString(http, "PeerCred", username);
 785
 786       DEBUG_printf(("8cups_local_auth: Returning authstring=\"%s\"",
 787                     http->authstring));
 788
 789       return (0);
 790     }
 791   }
 792 #  endif /* SO_PEERCRED && AF_LOCAL */
 793
 794  /*
 795   * Try opening a certificate file for this PID.  If that fails,
 796   * try the root certificate...
 797   */
 798
 799   pid = getpid();
 800   snprintf(filename, sizeof(filename), "%s/certs/%d", cg->cups_statedir, pid);
 801   if ((fp = fopen(filename, "r")) == NULL && pid > 0)
 802   {
 803    /*
 804     * No certificate for this PID; see if we can get the root certificate...
 805     */
 806
 807     DEBUG_printf(("9cups_local_auth: Unable to open file %s: %s",
 808                   filename, strerror(errno)));
 809
 810 #  ifdef HAVE_GSSAPI
 811     if (!strncmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Negotiate", 9))
 812     {
 813      /*
 814       * Kerberos required, don't try the root certificate...
 815       */
 816
 817       return (1);
 818     }
 819 #  endif /* HAVE_GSSAPI */
 820
 821 #  ifdef HAVE_AUTHORIZATION_H
 822     if (httpGetSubField2(http, HTTP_FIELD_WWW_AUTHENTICATE, "authkey",
 823                          auth_key, sizeof(auth_key)))
 824     {
 825      /*
 826       * Don't use the root certificate as a replacement for an authkey...
 827       */
 828
 829       return (1);
 830     }
 831 #  endif /* HAVE_AUTHORIZATION_H */
 832     if (!httpGetSubField2(http, HTTP_FIELD_WWW_AUTHENTICATE, "trc", trc,
 833                           sizeof(trc)))
 834     {
 835      /*
 836       * Scheduler doesn't want us to use the root certificate...
 837       */
 838
 839       return (1);
 840     }
 841
 842     snprintf(filename, sizeof(filename), "%s/certs/0", cg->cups_statedir);
 843     fp = fopen(filename, "r");
 844   }
 845
 846   if (fp)
 847   {
 848    /*
 849     * Read the certificate from the file...
 850     */
 851
 852     fgets(certificate, sizeof(certificate), fp);
 853     fclose(fp);
 854
 855    /*
 856     * Set the authorization string and return...
 857     */
 858
 859     httpSetAuthString(http, "Local", certificate);
 860
 861     DEBUG_printf(("8cups_local_auth: Returning authstring=\"%s\"",
 862                   http->authstring));
 863
 864     return (0);
 865   }
 866
 867   return (1);
 868 #endif /* WIN32 || __EMX__ */
 869 }
 870
 871
 872 /*
 873  * End of "$Id$".
 874  */