cups/auth.c

   1 /*
   2  * "$Id$"
   3  *
   4  * Authentication functions for CUPS.
   5  *
   6  * Copyright 2007-2014 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
  21 /*
  22  * Include necessary headers...
  23  */
  24
  25 #include "cups-private.h"
  26 #include <fcntl.h>
  27 #include <sys/stat.h>
  28 #if defined(WIN32) || defined(__EMX__)
  29 #  include <io.h>
  30 #else
  31 #  include <unistd.h>
  32 #endif /* WIN32 || __EMX__ */
  33
  34 #if HAVE_AUTHORIZATION_H
  35 #  include <Security/Authorization.h>
  36 #  ifdef HAVE_SECBASEPRIV_H
  37 #    include <Security/SecBasePriv.h>
  38 #  else
  39 extern const char *cssmErrorString(int error);
  40 #  endif /* HAVE_SECBASEPRIV_H */
  41 #endif /* HAVE_AUTHORIZATION_H */
  42
  43 #if defined(SO_PEERCRED) && defined(AF_LOCAL)
  44 #  include <pwd.h>
  45 #endif /* SO_PEERCRED && AF_LOCAL */
  46
  47
  48 /*
  49  * Local functions...
  50  */
  51
  52 #ifdef HAVE_GSSAPI
  53 #  ifdef HAVE_GSS_ACQUIRE_CRED_EX_F
  54 #    ifdef HAVE_GSS_GSSAPI_SPI_H
  55 #      include <GSS/gssapi_spi.h>
  56 #    else
  57 #      define GSS_AUTH_IDENTITY_TYPE_1 1
  58 #      define gss_acquire_cred_ex_f __ApplePrivate_gss_acquire_cred_ex_f
  59 typedef struct gss_auth_identity
  60 {
  61   uint32_t type;
  62   uint32_t flags;
  63   char *username;
  64   char *realm;
  65   char *password;
  66   gss_buffer_t *credentialsRef;
  67 } gss_auth_identity_desc;
  68 extern OM_uint32 gss_acquire_cred_ex_f(gss_status_id_t, const gss_name_t,
  69                                        OM_uint32, OM_uint32, const gss_OID,
  70                                        gss_cred_usage_t, gss_auth_identity_t,
  71                                        void *, void (*)(void *, OM_uint32,
  72                                                         gss_status_id_t,
  73                                                         gss_cred_id_t,
  74                                                         gss_OID_set,
  75                                                         OM_uint32));
  76 #    endif /* HAVE_GSS_GSSAPI_SPI_H */
  77 #    include <dispatch/dispatch.h>
  78 typedef struct _cups_gss_acquire_s      /* Acquire callback data */
  79 {
  80   dispatch_semaphore_t  sem;            /* Synchronization semaphore */
  81   OM_uint32             major;          /* Returned status code */
  82   gss_cred_id_t         creds;          /* Returned credentials */
  83 } _cups_gss_acquire_t;
  84
  85 static void     cups_gss_acquire(void *ctx, OM_uint32 major,
  86                                  gss_status_id_t status,
  87                                  gss_cred_id_t creds, gss_OID_set oids,
  88                                  OM_uint32 time_rec);
  89 #  endif /* HAVE_GSS_ACQUIRE_CRED_EX_F */
  90 static gss_name_t cups_gss_getname(http_t *http, const char *service_name);
  91 #  ifdef DEBUG
  92 static void     cups_gss_printf(OM_uint32 major_status, OM_uint32 minor_status,
  93                                 const char *message);
  94 #  else
  95 #    define     cups_gss_printf(major, minor, message)
  96 #  endif /* DEBUG */
  97 #endif /* HAVE_GSSAPI */
  98 static int      cups_local_auth(http_t *http);
  99
 100
 101 /*
 102  * 'cupsDoAuthentication()' - Authenticate a request.
 103  *
 104  * This function should be called in response to a @code HTTP_STATUS_UNAUTHORIZED@
 105  * status, prior to resubmitting your request.
 106  *
 107  * @since CUPS 1.1.20/OS X 10.4@
 108  */
 109
 110 int                                     /* O - 0 on success, -1 on error */
 111 cupsDoAuthentication(
 112     http_t     *http,                   /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
 113     const char *method,                 /* I - Request method ("GET", "POST", "PUT") */
 114     const char *resource)               /* I - Resource path */
 115 {
 116   const char    *password,              /* Password string */
 117                 *www_auth;              /* WWW-Authenticate header */
 118   char          prompt[1024],           /* Prompt for user */
 119                 realm[HTTP_MAX_VALUE],  /* realm="xyz" string */
 120                 nonce[HTTP_MAX_VALUE];  /* nonce="xyz" string */
 121   int           localauth;              /* Local authentication result */
 122   _cups_globals_t *cg;                  /* Global data */
 123
 124
 125   DEBUG_printf(("cupsDoAuthentication(http=%p, method=\"%s\", resource=\"%s\")",
 126                 http, method, resource));
 127
 128   if (!http)
 129     http = _cupsConnect();
 130
 131   if (!http || !method || !resource)
 132     return (-1);
 133
 134   DEBUG_printf(("2cupsDoAuthentication: digest_tries=%d, userpass=\"%s\"",
 135                 http->digest_tries, http->userpass));
 136   DEBUG_printf(("2cupsDoAuthentication: WWW-Authenticate=\"%s\"",
 137                 httpGetField(http, HTTP_FIELD_WWW_AUTHENTICATE)));
 138
 139  /*
 140   * Clear the current authentication string...
 141   */
 142
 143   httpSetAuthString(http, NULL, NULL);
 144
 145  /*
 146   * See if we can do local authentication...
 147   */
 148
 149   if (http->digest_tries < 3)
 150   {
 151     if ((localauth = cups_local_auth(http)) == 0)
 152     {
 153       DEBUG_printf(("2cupsDoAuthentication: authstring=\"%s\"",
 154                     http->authstring));
 155
 156       if (http->status == HTTP_STATUS_UNAUTHORIZED)
 157         http->digest_tries ++;
 158
 159       return (0);
 160     }
 161     else if (localauth == -1)
 162     {
 163       http->status = HTTP_STATUS_CUPS_AUTHORIZATION_CANCELED;
 164       return (-1);                      /* Error or canceled */
 165     }
 166   }
 167
 168  /*
 169   * Nope, see if we should retry the current username:password...
 170   */
 171
 172   www_auth = http->fields[HTTP_FIELD_WWW_AUTHENTICATE];
 173
 174   if ((http->digest_tries > 1 || !http->userpass[0]) &&
 175       (!_cups_strncasecmp(www_auth, "Basic", 5) ||
 176        !_cups_strncasecmp(www_auth, "Digest", 6)))
 177   {
 178    /*
 179     * Nope - get a new password from the user...
 180     */
 181
 182     char default_username[HTTP_MAX_VALUE];
 183                                         /* Default username */
 184
 185     cg = _cupsGlobals();
 186
 187     if (!cg->lang_default)
 188       cg->lang_default = cupsLangDefault();
 189
 190     if (httpGetSubField(http, HTTP_FIELD_WWW_AUTHENTICATE, "username",
 191                         default_username))
 192       cupsSetUser(default_username);
 193
 194     snprintf(prompt, sizeof(prompt),
 195              _cupsLangString(cg->lang_default, _("Password for %s on %s? ")),
 196              cupsUser(),
 197              http->hostname[0] == '/' ? "localhost" : http->hostname);
 198
 199     http->digest_tries  = _cups_strncasecmp(www_auth, "Digest", 6) != 0;
 200     http->userpass[0]   = '\0';
 201
 202     if ((password = cupsGetPassword2(prompt, http, method, resource)) == NULL)
 203     {
 204       http->status = HTTP_STATUS_CUPS_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_STATUS_UNAUTHORIZED)
 212     http->digest_tries ++;
 213
 214   if (http->status == HTTP_STATUS_UNAUTHORIZED && http->digest_tries >= 3)
 215   {
 216     DEBUG_printf(("1cupsDoAuthentication: Too many authentication tries (%d)",
 217                   http->digest_tries));
 218
 219     http->status = HTTP_STATUS_CUPS_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 (!_cups_strncasecmp(www_auth, "Negotiate", 9))
 229   {
 230    /*
 231     * Kerberos authentication...
 232     */
 233
 234     if (_cupsSetNegotiateAuthString(http, method, resource))
 235     {
 236       http->status = HTTP_STATUS_CUPS_AUTHORIZATION_CANCELED;
 237       return (-1);
 238     }
 239   }
 240   else
 241 #endif /* HAVE_GSSAPI */
 242   if (!_cups_strncasecmp(www_auth, "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 (!_cups_strncasecmp(www_auth, "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                   www_auth));
 279     http->status = HTTP_STATUS_CUPS_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   (void)method;
 307   (void)resource;
 308
 309 #  ifdef __APPLE__
 310  /*
 311   * If the weak-linked GSSAPI/Kerberos library is not present, don't try
 312   * to use it...
 313   */
 314
 315   if (gss_init_sec_context == NULL)
 316   {
 317     DEBUG_puts("1_cupsSetNegotiateAuthString: Weak-linked GSSAPI/Kerberos "
 318                "framework is not present");
 319     return (-1);
 320   }
 321 #  endif /* __APPLE__ */
 322
 323   if (http->gssname == GSS_C_NO_NAME)
 324   {
 325     http->gssname = cups_gss_getname(http, _cupsGSSServiceName());
 326   }
 327
 328   if (http->gssctx != GSS_C_NO_CONTEXT)
 329   {
 330     gss_delete_sec_context(&minor_status, &http->gssctx, GSS_C_NO_BUFFER);
 331     http->gssctx = GSS_C_NO_CONTEXT;
 332   }
 333
 334   major_status = gss_init_sec_context(&minor_status, GSS_C_NO_CREDENTIAL,
 335                                       &http->gssctx,
 336                                       http->gssname, http->gssmech,
 337                                       GSS_C_MUTUAL_FLAG | GSS_C_INTEG_FLAG,
 338                                       GSS_C_INDEFINITE,
 339                                       GSS_C_NO_CHANNEL_BINDINGS,
 340                                       GSS_C_NO_BUFFER, &http->gssmech,
 341                                       &output_token, NULL, NULL);
 342
 343 #ifdef HAVE_GSS_ACQUIRE_CRED_EX_F
 344   if (major_status == GSS_S_NO_CRED)
 345   {
 346    /*
 347     * Ask the user for credentials...
 348     */
 349
 350     char                prompt[1024],   /* Prompt for user */
 351                         userbuf[256];   /* Kerberos username */
 352     const char          *username,      /* Username string */
 353                         *password;      /* Password string */
 354     _cups_gss_acquire_t data;           /* Callback data */
 355     gss_auth_identity_desc identity;    /* Kerberos user identity */
 356     _cups_globals_t     *cg = _cupsGlobals();
 357                                         /* Per-thread global data */
 358
 359     if (!cg->lang_default)
 360       cg->lang_default = cupsLangDefault();
 361
 362     snprintf(prompt, sizeof(prompt),
 363              _cupsLangString(cg->lang_default, _("Password for %s on %s? ")),
 364              cupsUser(), http->gsshost);
 365
 366     if ((password = cupsGetPassword2(prompt, http, method, resource)) == NULL)
 367       return (-1);
 368
 369    /*
 370     * Try to acquire credentials...
 371     */
 372
 373     username = cupsUser();
 374     if (!strchr(username, '@'))
 375     {
 376       snprintf(userbuf, sizeof(userbuf), "%s@%s", username, http->gsshost);
 377       username = userbuf;
 378     }
 379
 380     identity.type           = GSS_AUTH_IDENTITY_TYPE_1;
 381     identity.flags          = 0;
 382     identity.username       = (char *)username;
 383     identity.realm          = (char *)"";
 384     identity.password       = (char *)password;
 385     identity.credentialsRef = NULL;
 386
 387     data.sem   = dispatch_semaphore_create(0);
 388     data.major = 0;
 389     data.creds = NULL;
 390
 391     if (data.sem)
 392     {
 393       major_status = gss_acquire_cred_ex_f(NULL, GSS_C_NO_NAME, 0,
 394                                            GSS_C_INDEFINITE, GSS_KRB5_MECHANISM,
 395                                            GSS_C_INITIATE, &identity, &data,
 396                                            cups_gss_acquire);
 397
 398       if (major_status == GSS_S_COMPLETE)
 399       {
 400         dispatch_semaphore_wait(data.sem, DISPATCH_TIME_FOREVER);
 401         major_status = data.major;
 402       }
 403
 404       dispatch_release(data.sem);
 405
 406       if (major_status == GSS_S_COMPLETE)
 407       {
 408         OM_uint32       release_minor;  /* Minor status from releasing creds */
 409
 410         major_status = gss_init_sec_context(&minor_status, data.creds,
 411                                             &http->gssctx,
 412                                             http->gssname, http->gssmech,
 413                                             GSS_C_MUTUAL_FLAG | GSS_C_INTEG_FLAG,
 414                                             GSS_C_INDEFINITE,
 415                                             GSS_C_NO_CHANNEL_BINDINGS,
 416                                             GSS_C_NO_BUFFER, &http->gssmech,
 417                                             &output_token, NULL, NULL);
 418         gss_release_cred(&release_minor, &data.creds);
 419       }
 420     }
 421   }
 422 #endif /* HAVE_GSS_ACQUIRED_CRED_EX_F */
 423
 424   if (GSS_ERROR(major_status))
 425   {
 426     cups_gss_printf(major_status, minor_status,
 427                     "_cupsSetNegotiateAuthString: Unable to initialize "
 428                     "security context");
 429     return (-1);
 430   }
 431
 432 #ifdef DEBUG
 433   else if (major_status == GSS_S_CONTINUE_NEEDED)
 434     cups_gss_printf(major_status, minor_status,
 435                     "_cupsSetNegotiateAuthString: Continuation needed!");
 436 #endif /* DEBUG */
 437
 438   if (output_token.length > 0 && output_token.length <= 65536)
 439   {
 440    /*
 441     * Allocate the authorization string since Windows KDCs can have
 442     * arbitrarily large credentials...
 443     */
 444
 445     int authsize = 10 +                 /* "Negotiate " */
 446                    (int)output_token.length * 4 / 3 + 1 + 1;
 447                                         /* Base64 + nul */
 448
 449     httpSetAuthString(http, NULL, NULL);
 450
 451     if ((http->authstring = malloc((size_t)authsize)) == NULL)
 452     {
 453       http->authstring = http->_authstring;
 454       authsize         = sizeof(http->_authstring);
 455     }
 456
 457     strlcpy(http->authstring, "Negotiate ", (size_t)authsize);
 458     httpEncode64_2(http->authstring + 10, authsize - 10, output_token.value,
 459                    (int)output_token.length);
 460
 461     gss_release_buffer(&minor_status, &output_token);
 462   }
 463   else
 464   {
 465     DEBUG_printf(("1_cupsSetNegotiateAuthString: Kerberos credentials too "
 466                   "large - %d bytes!", (int)output_token.length));
 467     gss_release_buffer(&minor_status, &output_token);
 468
 469     return (-1);
 470   }
 471
 472   return (0);
 473 }
 474
 475
 476 #  ifdef HAVE_GSS_ACQUIRE_CRED_EX_F
 477 /*
 478  * 'cups_gss_acquire()' - Kerberos credentials callback.
 479  */
 480 static void
 481 cups_gss_acquire(
 482     void            *ctx,               /* I - Caller context */
 483     OM_uint32       major,              /* I - Major error code */
 484     gss_status_id_t status,             /* I - Status (unused) */
 485     gss_cred_id_t   creds,              /* I - Credentials (if any) */
 486     gss_OID_set     oids,               /* I - Mechanism OIDs (unused) */
 487     OM_uint32       time_rec)           /* I - Timestamp (unused) */
 488 {
 489   uint32_t              min;            /* Minor error code */
 490   _cups_gss_acquire_t   *data;          /* Callback data */
 491
 492
 493   (void)status;
 494   (void)time_rec;
 495
 496   data        = (_cups_gss_acquire_t *)ctx;
 497   data->major = major;
 498   data->creds = creds;
 499
 500   gss_release_oid_set(&min, &oids);
 501   dispatch_semaphore_signal(data->sem);
 502 }
 503 #  endif /* HAVE_GSS_ACQUIRE_CRED_EX_F */
 504
 505
 506 /*
 507  * 'cups_gss_getname()' - Get CUPS service credentials for authentication.
 508  */
 509
 510 static gss_name_t                       /* O - Server name */
 511 cups_gss_getname(
 512     http_t     *http,                   /* I - Connection to server */
 513     const char *service_name)           /* I - Service name */
 514 {
 515   gss_buffer_desc token = GSS_C_EMPTY_BUFFER;
 516                                         /* Service token */
 517   OM_uint32       major_status,         /* Major status code */
 518                   minor_status;         /* Minor status code */
 519   gss_name_t      server_name;          /* Server name */
 520   char            buf[1024];            /* Name buffer */
 521
 522
 523   DEBUG_printf(("7cups_gss_getname(http=%p, service_name=\"%s\")", http,
 524                 service_name));
 525
 526
 527  /*
 528   * Get the hostname...
 529   */
 530
 531   if (!http->gsshost[0])
 532   {
 533     httpGetHostname(http, http->gsshost, sizeof(http->gsshost));
 534
 535     if (!strcmp(http->gsshost, "localhost"))
 536     {
 537       if (gethostname(http->gsshost, sizeof(http->gsshost)) < 0)
 538       {
 539         DEBUG_printf(("1cups_gss_getname: gethostname() failed: %s",
 540                       strerror(errno)));
 541         http->gsshost[0] = '\0';
 542         return (NULL);
 543       }
 544
 545       if (!strchr(http->gsshost, '.'))
 546       {
 547        /*
 548         * The hostname is not a FQDN, so look it up...
 549         */
 550
 551         struct hostent  *host;          /* Host entry to get FQDN */
 552
 553         if ((host = gethostbyname(http->gsshost)) != NULL && host->h_name)
 554         {
 555          /*
 556           * Use the resolved hostname...
 557           */
 558
 559           strlcpy(http->gsshost, host->h_name, sizeof(http->gsshost));
 560         }
 561         else
 562         {
 563           DEBUG_printf(("1cups_gss_getname: gethostbyname(\"%s\") failed.",
 564                         http->gsshost));
 565           http->gsshost[0] = '\0';
 566           return (NULL);
 567         }
 568       }
 569     }
 570   }
 571
 572  /*
 573   * Get a service name we can use for authentication purposes...
 574   */
 575
 576   snprintf(buf, sizeof(buf), "%s@%s", service_name, http->gsshost);
 577
 578   DEBUG_printf(("8cups_gss_getname: Looking up \"%s\".", buf));
 579
 580   token.value  = buf;
 581   token.length = strlen(buf);
 582   server_name  = GSS_C_NO_NAME;
 583   major_status = gss_import_name(&minor_status, &token,
 584                                  GSS_C_NT_HOSTBASED_SERVICE,
 585                                  &server_name);
 586
 587   if (GSS_ERROR(major_status))
 588   {
 589     cups_gss_printf(major_status, minor_status,
 590                     "cups_gss_getname: gss_import_name() failed");
 591     return (NULL);
 592   }
 593
 594   return (server_name);
 595 }
 596
 597
 598 #  ifdef DEBUG
 599 /*
 600  * 'cups_gss_printf()' - Show debug error messages from GSSAPI.
 601  */
 602
 603 static void
 604 cups_gss_printf(OM_uint32  major_status,/* I - Major status code */
 605                 OM_uint32  minor_status,/* I - Minor status code */
 606                 const char *message)    /* I - Prefix for error message */
 607 {
 608   OM_uint32     err_major_status,       /* Major status code for display */
 609                 err_minor_status;       /* Minor status code for display */
 610   OM_uint32     msg_ctx;                /* Message context */
 611   gss_buffer_desc major_status_string = GSS_C_EMPTY_BUFFER,
 612                                         /* Major status message */
 613                 minor_status_string = GSS_C_EMPTY_BUFFER;
 614                                         /* Minor status message */
 615
 616
 617   msg_ctx          = 0;
 618   err_major_status = gss_display_status(&err_minor_status,
 619                                         major_status,
 620                                         GSS_C_GSS_CODE,
 621                                         GSS_C_NO_OID,
 622                                         &msg_ctx,
 623                                         &major_status_string);
 624
 625   if (!GSS_ERROR(err_major_status))
 626     gss_display_status(&err_minor_status, minor_status, GSS_C_MECH_CODE,
 627                        GSS_C_NULL_OID, &msg_ctx, &minor_status_string);
 628
 629   DEBUG_printf(("1%s: %s, %s", message, (char *)major_status_string.value,
 630                 (char *)minor_status_string.value));
 631
 632   gss_release_buffer(&err_minor_status, &major_status_string);
 633   gss_release_buffer(&err_minor_status, &minor_status_string);
 634 }
 635 #  endif /* DEBUG */
 636 #endif /* HAVE_GSSAPI */
 637
 638
 639 /*
 640  * 'cups_local_auth()' - Get the local authorization certificate if
 641  *                       available/applicable.
 642  */
 643
 644 static int                              /* O - 0 if available */
 645                                         /*     1 if not available */
 646                                         /*    -1 error */
 647 cups_local_auth(http_t *http)           /* I - HTTP connection to server */
 648 {
 649 #if defined(WIN32) || defined(__EMX__)
 650  /*
 651   * Currently WIN32 and OS-2 do not support the CUPS server...
 652   */
 653
 654   return (1);
 655 #else
 656   int                   pid;            /* Current process ID */
 657   FILE                  *fp;            /* Certificate file */
 658   char                  trc[16],        /* Try Root Certificate parameter */
 659                         filename[1024]; /* Certificate filename */
 660   _cups_globals_t *cg = _cupsGlobals(); /* Global data */
 661 #  if defined(HAVE_AUTHORIZATION_H)
 662   OSStatus              status;         /* Status */
 663   AuthorizationItem     auth_right;     /* Authorization right */
 664   AuthorizationRights   auth_rights;    /* Authorization rights */
 665   AuthorizationFlags    auth_flags;     /* Authorization flags */
 666   AuthorizationExternalForm auth_extrn; /* Authorization ref external */
 667   char                  auth_key[1024]; /* Buffer */
 668   char                  buffer[1024];   /* Buffer */
 669 #  endif /* HAVE_AUTHORIZATION_H */
 670
 671
 672   DEBUG_printf(("7cups_local_auth(http=%p) hostaddr=%s, hostname=\"%s\"",
 673                 http, httpAddrString(http->hostaddr, filename, sizeof(filename)), http->hostname));
 674
 675  /*
 676   * See if we are accessing localhost...
 677   */
 678
 679   if (!httpAddrLocalhost(http->hostaddr) &&
 680       _cups_strcasecmp(http->hostname, "localhost") != 0)
 681   {
 682     DEBUG_puts("8cups_local_auth: Not a local connection!");
 683     return (1);
 684   }
 685
 686 #  if defined(HAVE_AUTHORIZATION_H)
 687  /*
 688   * Delete any previous authorization reference...
 689   */
 690
 691   if (http->auth_ref)
 692   {
 693     AuthorizationFree(http->auth_ref, kAuthorizationFlagDefaults);
 694     http->auth_ref = NULL;
 695   }
 696
 697   if (!getenv("GATEWAY_INTERFACE") &&
 698       httpGetSubField2(http, HTTP_FIELD_WWW_AUTHENTICATE, "authkey",
 699                        auth_key, sizeof(auth_key)))
 700   {
 701     status = AuthorizationCreate(NULL, kAuthorizationEmptyEnvironment,
 702                                  kAuthorizationFlagDefaults, &http->auth_ref);
 703     if (status != errAuthorizationSuccess)
 704     {
 705       DEBUG_printf(("8cups_local_auth: AuthorizationCreate() returned %d (%s)",
 706                     (int)status, cssmErrorString(status)));
 707       return (-1);
 708     }
 709
 710     auth_right.name        = auth_key;
 711     auth_right.valueLength = 0;
 712     auth_right.value       = NULL;
 713     auth_right.flags       = 0;
 714
 715     auth_rights.count = 1;
 716     auth_rights.items = &auth_right;
 717
 718     auth_flags = kAuthorizationFlagDefaults |
 719                  kAuthorizationFlagPreAuthorize |
 720                  kAuthorizationFlagInteractionAllowed |
 721                  kAuthorizationFlagExtendRights;
 722
 723     status = AuthorizationCopyRights(http->auth_ref, &auth_rights,
 724                                      kAuthorizationEmptyEnvironment,
 725                                      auth_flags, NULL);
 726     if (status == errAuthorizationSuccess)
 727       status = AuthorizationMakeExternalForm(http->auth_ref, &auth_extrn);
 728
 729     if (status == errAuthorizationSuccess)
 730     {
 731      /*
 732       * Set the authorization string and return...
 733       */
 734
 735       httpEncode64_2(buffer, sizeof(buffer), (void *)&auth_extrn,
 736                      sizeof(auth_extrn));
 737
 738       httpSetAuthString(http, "AuthRef", buffer);
 739
 740       DEBUG_printf(("8cups_local_auth: Returning authstring=\"%s\"",
 741                     http->authstring));
 742       return (0);
 743     }
 744     else if (status == errAuthorizationCanceled)
 745       return (-1);
 746
 747     DEBUG_printf(("9cups_local_auth: AuthorizationCopyRights() returned %d (%s)",
 748                   (int)status, cssmErrorString(status)));
 749
 750   /*
 751    * Fall through to try certificates...
 752    */
 753   }
 754 #  endif /* HAVE_AUTHORIZATION_H */
 755
 756 #  if defined(SO_PEERCRED) && defined(AF_LOCAL)
 757  /*
 758   * See if we can authenticate using the peer credentials provided over a
 759   * domain socket; if so, specify "PeerCred username" as the authentication
 760   * information...
 761   */
 762
 763   if (
 764 #    ifdef HAVE_GSSAPI
 765       strncmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Negotiate", 9) &&
 766 #    endif /* HAVE_GSSAPI */
 767 #    ifdef HAVE_AUTHORIZATION_H
 768       !httpGetSubField2(http, HTTP_FIELD_WWW_AUTHENTICATE, "authkey",
 769                         auth_key, sizeof(auth_key)) &&
 770 #    endif /* HAVE_AUTHORIZATION_H */
 771       http->hostaddr->addr.sa_family == AF_LOCAL &&
 772       !getenv("GATEWAY_INTERFACE"))     /* Not via CGI programs... */
 773   {
 774    /*
 775     * Verify that the current cupsUser() matches the current UID...
 776     */
 777
 778     struct passwd       *pwd;           /* Password information */
 779     const char          *username;      /* Current username */
 780
 781     username = cupsUser();
 782
 783     if ((pwd = getpwnam(username)) != NULL && pwd->pw_uid == getuid())
 784     {
 785       httpSetAuthString(http, "PeerCred", username);
 786
 787       DEBUG_printf(("8cups_local_auth: Returning authstring=\"%s\"",
 788                     http->authstring));
 789
 790       return (0);
 791     }
 792   }
 793 #  endif /* SO_PEERCRED && AF_LOCAL */
 794
 795  /*
 796   * Try opening a certificate file for this PID.  If that fails,
 797   * try the root certificate...
 798   */
 799
 800   pid = getpid();
 801   snprintf(filename, sizeof(filename), "%s/certs/%d", cg->cups_statedir, pid);
 802   if ((fp = fopen(filename, "r")) == NULL && pid > 0)
 803   {
 804    /*
 805     * No certificate for this PID; see if we can get the root certificate...
 806     */
 807
 808     DEBUG_printf(("9cups_local_auth: Unable to open file %s: %s",
 809                   filename, strerror(errno)));
 810
 811 #  ifdef HAVE_GSSAPI
 812     if (!strncmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Negotiate", 9))
 813     {
 814      /*
 815       * Kerberos required, don't try the root certificate...
 816       */
 817
 818       return (1);
 819     }
 820 #  endif /* HAVE_GSSAPI */
 821
 822 #  ifdef HAVE_AUTHORIZATION_H
 823     if (httpGetSubField2(http, HTTP_FIELD_WWW_AUTHENTICATE, "authkey",
 824                          auth_key, sizeof(auth_key)))
 825     {
 826      /*
 827       * Don't use the root certificate as a replacement for an authkey...
 828       */
 829
 830       return (1);
 831     }
 832 #  endif /* HAVE_AUTHORIZATION_H */
 833     if (!httpGetSubField2(http, HTTP_FIELD_WWW_AUTHENTICATE, "trc", trc,
 834                           sizeof(trc)))
 835     {
 836      /*
 837       * Scheduler doesn't want us to use the root certificate...
 838       */
 839
 840       return (1);
 841     }
 842
 843     snprintf(filename, sizeof(filename), "%s/certs/0", cg->cups_statedir);
 844     fp = fopen(filename, "r");
 845   }
 846
 847   if (fp)
 848   {
 849    /*
 850     * Read the certificate from the file...
 851     */
 852
 853     char        certificate[33],        /* Certificate string */
 854                 *certptr;               /* Pointer to certificate string */
 855
 856     certptr = fgets(certificate, sizeof(certificate), fp);
 857     fclose(fp);
 858
 859     if (certptr)
 860     {
 861      /*
 862       * Set the authorization string and return...
 863       */
 864
 865       httpSetAuthString(http, "Local", certificate);
 866
 867       DEBUG_printf(("8cups_local_auth: Returning authstring=\"%s\"",
 868                     http->authstring));
 869
 870       return (0);
 871     }
 872   }
 873
 874   return (1);
 875 #endif /* WIN32 || __EMX__ */
 876 }
 877
 878
 879 /*
 880  * End of "$Id$".
 881  */