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\")", (void *)http, method, resource));
 126
 127   if (!http)
 128     http = _cupsConnect();
 129
 130   if (!http || !method || !resource)
 131     return (-1);
 132
 133   DEBUG_printf(("2cupsDoAuthentication: digest_tries=%d, userpass=\"%s\"",
 134                 http->digest_tries, http->userpass));
 135   DEBUG_printf(("2cupsDoAuthentication: WWW-Authenticate=\"%s\"",
 136                 httpGetField(http, HTTP_FIELD_WWW_AUTHENTICATE)));
 137
 138  /*
 139   * Clear the current authentication string...
 140   */
 141
 142   httpSetAuthString(http, NULL, NULL);
 143
 144  /*
 145   * See if we can do local authentication...
 146   */
 147
 148   if (http->digest_tries < 3)
 149   {
 150     if ((localauth = cups_local_auth(http)) == 0)
 151     {
 152       DEBUG_printf(("2cupsDoAuthentication: authstring=\"%s\"",
 153                     http->authstring));
 154
 155       if (http->status == HTTP_STATUS_UNAUTHORIZED)
 156         http->digest_tries ++;
 157
 158       return (0);
 159     }
 160     else if (localauth == -1)
 161     {
 162       http->status = HTTP_STATUS_CUPS_AUTHORIZATION_CANCELED;
 163       return (-1);                      /* Error or canceled */
 164     }
 165   }
 166
 167  /*
 168   * Nope, see if we should retry the current username:password...
 169   */
 170
 171   www_auth = http->fields[HTTP_FIELD_WWW_AUTHENTICATE];
 172
 173   if ((http->digest_tries > 1 || !http->userpass[0]) &&
 174       (!_cups_strncasecmp(www_auth, "Basic", 5) ||
 175        !_cups_strncasecmp(www_auth, "Digest", 6)))
 176   {
 177    /*
 178     * Nope - get a new password from the user...
 179     */
 180
 181     char default_username[HTTP_MAX_VALUE];
 182                                         /* Default username */
 183
 184     cg = _cupsGlobals();
 185
 186     if (!cg->lang_default)
 187       cg->lang_default = cupsLangDefault();
 188
 189     if (httpGetSubField(http, HTTP_FIELD_WWW_AUTHENTICATE, "username",
 190                         default_username))
 191       cupsSetUser(default_username);
 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  = _cups_strncasecmp(www_auth, "Digest", 6) != 0;
 199     http->userpass[0]   = '\0';
 200
 201     if ((password = cupsGetPassword2(prompt, http, method, resource)) == NULL)
 202     {
 203       http->status = HTTP_STATUS_CUPS_AUTHORIZATION_CANCELED;
 204       return (-1);
 205     }
 206
 207     snprintf(http->userpass, sizeof(http->userpass), "%s:%s", cupsUser(),
 208              password);
 209   }
 210   else if (http->status == HTTP_STATUS_UNAUTHORIZED)
 211     http->digest_tries ++;
 212
 213   if (http->status == HTTP_STATUS_UNAUTHORIZED && http->digest_tries >= 3)
 214   {
 215     DEBUG_printf(("1cupsDoAuthentication: Too many authentication tries (%d)",
 216                   http->digest_tries));
 217
 218     http->status = HTTP_STATUS_CUPS_AUTHORIZATION_CANCELED;
 219     return (-1);
 220   }
 221
 222  /*
 223   * Got a password; encode it for the server...
 224   */
 225
 226 #ifdef HAVE_GSSAPI
 227   if (!_cups_strncasecmp(www_auth, "Negotiate", 9))
 228   {
 229    /*
 230     * Kerberos authentication...
 231     */
 232
 233     if (_cupsSetNegotiateAuthString(http, method, resource))
 234     {
 235       http->status = HTTP_STATUS_CUPS_AUTHORIZATION_CANCELED;
 236       return (-1);
 237     }
 238   }
 239   else
 240 #endif /* HAVE_GSSAPI */
 241   if (!_cups_strncasecmp(www_auth, "Basic", 5))
 242   {
 243    /*
 244     * Basic authentication...
 245     */
 246
 247     char        encode[256];            /* Base64 buffer */
 248
 249
 250     httpEncode64_2(encode, sizeof(encode), http->userpass,
 251                    (int)strlen(http->userpass));
 252     httpSetAuthString(http, "Basic", encode);
 253   }
 254   else if (!_cups_strncasecmp(www_auth, "Digest", 6))
 255   {
 256    /*
 257     * Digest authentication...
 258     */
 259
 260     char        encode[33],             /* MD5 buffer */
 261                 digest[1024];           /* Digest auth data */
 262
 263     httpGetSubField(http, HTTP_FIELD_WWW_AUTHENTICATE, "realm", realm);
 264     httpGetSubField(http, HTTP_FIELD_WWW_AUTHENTICATE, "nonce", nonce);
 265
 266     httpMD5(cupsUser(), realm, strchr(http->userpass, ':') + 1, encode);
 267     httpMD5Final(nonce, method, resource, encode);
 268     snprintf(digest, sizeof(digest),
 269              "username=\"%s\", realm=\"%s\", nonce=\"%s\", uri=\"%s\", "
 270              "response=\"%s\"", cupsUser(), realm, nonce, resource, encode);
 271     httpSetAuthString(http, "Digest", digest);
 272   }
 273   else
 274   {
 275     DEBUG_printf(("1cupsDoAuthentication: Unknown auth type: \"%s\"",
 276                   www_auth));
 277     http->status = HTTP_STATUS_CUPS_AUTHORIZATION_CANCELED;
 278     return (-1);
 279   }
 280
 281   DEBUG_printf(("1cupsDoAuthentication: authstring=\"%s\"", http->authstring));
 282
 283   return (0);
 284 }
 285
 286
 287 #ifdef HAVE_GSSAPI
 288 /*
 289  * '_cupsSetNegotiateAuthString()' - Set the Kerberos authentication string.
 290  */
 291
 292 int                                     /* O - 0 on success, -1 on error */
 293 _cupsSetNegotiateAuthString(
 294     http_t     *http,                   /* I - Connection to server */
 295     const char *method,                 /* I - Request method ("GET", "POST", "PUT") */
 296     const char *resource)               /* I - Resource path */
 297 {
 298   OM_uint32     minor_status,           /* Minor status code */
 299                 major_status;           /* Major status code */
 300   gss_buffer_desc output_token = GSS_C_EMPTY_BUFFER;
 301                                         /* Output token */
 302
 303
 304   (void)method;
 305   (void)resource;
 306
 307 #  ifdef __APPLE__
 308  /*
 309   * If the weak-linked GSSAPI/Kerberos library is not present, don't try
 310   * to use it...
 311   */
 312
 313   if (&gss_init_sec_context == NULL)
 314   {
 315     DEBUG_puts("1_cupsSetNegotiateAuthString: Weak-linked GSSAPI/Kerberos "
 316                "framework is not present");
 317     return (-1);
 318   }
 319 #  endif /* __APPLE__ */
 320
 321   if (http->gssname == GSS_C_NO_NAME)
 322   {
 323     http->gssname = cups_gss_getname(http, _cupsGSSServiceName());
 324   }
 325
 326   if (http->gssctx != GSS_C_NO_CONTEXT)
 327   {
 328     gss_delete_sec_context(&minor_status, &http->gssctx, GSS_C_NO_BUFFER);
 329     http->gssctx = GSS_C_NO_CONTEXT;
 330   }
 331
 332   major_status = gss_init_sec_context(&minor_status, GSS_C_NO_CREDENTIAL,
 333                                       &http->gssctx,
 334                                       http->gssname, http->gssmech,
 335                                       GSS_C_MUTUAL_FLAG | GSS_C_INTEG_FLAG,
 336                                       GSS_C_INDEFINITE,
 337                                       GSS_C_NO_CHANNEL_BINDINGS,
 338                                       GSS_C_NO_BUFFER, &http->gssmech,
 339                                       &output_token, NULL, NULL);
 340
 341 #ifdef HAVE_GSS_ACQUIRE_CRED_EX_F
 342   if (major_status == GSS_S_NO_CRED)
 343   {
 344    /*
 345     * Ask the user for credentials...
 346     */
 347
 348     char                prompt[1024],   /* Prompt for user */
 349                         userbuf[256];   /* Kerberos username */
 350     const char          *username,      /* Username string */
 351                         *password;      /* Password string */
 352     _cups_gss_acquire_t data;           /* Callback data */
 353     gss_auth_identity_desc identity;    /* Kerberos user identity */
 354     _cups_globals_t     *cg = _cupsGlobals();
 355                                         /* Per-thread global data */
 356
 357     if (!cg->lang_default)
 358       cg->lang_default = cupsLangDefault();
 359
 360     snprintf(prompt, sizeof(prompt),
 361              _cupsLangString(cg->lang_default, _("Password for %s on %s? ")),
 362              cupsUser(), http->gsshost);
 363
 364     if ((password = cupsGetPassword2(prompt, http, method, resource)) == NULL)
 365       return (-1);
 366
 367    /*
 368     * Try to acquire credentials...
 369     */
 370
 371     username = cupsUser();
 372     if (!strchr(username, '@'))
 373     {
 374       snprintf(userbuf, sizeof(userbuf), "%s@%s", username, http->gsshost);
 375       username = userbuf;
 376     }
 377
 378     identity.type           = GSS_AUTH_IDENTITY_TYPE_1;
 379     identity.flags          = 0;
 380     identity.username       = (char *)username;
 381     identity.realm          = (char *)"";
 382     identity.password       = (char *)password;
 383     identity.credentialsRef = NULL;
 384
 385     data.sem   = dispatch_semaphore_create(0);
 386     data.major = 0;
 387     data.creds = NULL;
 388
 389     if (data.sem)
 390     {
 391       major_status = gss_acquire_cred_ex_f(NULL, GSS_C_NO_NAME, 0,
 392                                            GSS_C_INDEFINITE, GSS_KRB5_MECHANISM,
 393                                            GSS_C_INITIATE, &identity, &data,
 394                                            cups_gss_acquire);
 395
 396       if (major_status == GSS_S_COMPLETE)
 397       {
 398         dispatch_semaphore_wait(data.sem, DISPATCH_TIME_FOREVER);
 399         major_status = data.major;
 400       }
 401
 402       dispatch_release(data.sem);
 403
 404       if (major_status == GSS_S_COMPLETE)
 405       {
 406         OM_uint32       release_minor;  /* Minor status from releasing creds */
 407
 408         major_status = gss_init_sec_context(&minor_status, data.creds,
 409                                             &http->gssctx,
 410                                             http->gssname, http->gssmech,
 411                                             GSS_C_MUTUAL_FLAG | GSS_C_INTEG_FLAG,
 412                                             GSS_C_INDEFINITE,
 413                                             GSS_C_NO_CHANNEL_BINDINGS,
 414                                             GSS_C_NO_BUFFER, &http->gssmech,
 415                                             &output_token, NULL, NULL);
 416         gss_release_cred(&release_minor, &data.creds);
 417       }
 418     }
 419   }
 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                    (int)output_token.length * 4 / 3 + 1 + 1;
 445                                         /* Base64 + nul */
 446
 447     httpSetAuthString(http, NULL, NULL);
 448
 449     if ((http->authstring = malloc((size_t)authsize)) == NULL)
 450     {
 451       http->authstring = http->_authstring;
 452       authsize         = sizeof(http->_authstring);
 453     }
 454
 455     strlcpy(http->authstring, "Negotiate ", (size_t)authsize);
 456     httpEncode64_2(http->authstring + 10, authsize - 10, output_token.value,
 457                    (int)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   _cups_globals_t *cg = _cupsGlobals(); /* Global data */
 659 #  if defined(HAVE_AUTHORIZATION_H)
 660   OSStatus              status;         /* Status */
 661   AuthorizationItem     auth_right;     /* Authorization right */
 662   AuthorizationRights   auth_rights;    /* Authorization rights */
 663   AuthorizationFlags    auth_flags;     /* Authorization flags */
 664   AuthorizationExternalForm auth_extrn; /* Authorization ref external */
 665   char                  auth_key[1024]; /* Buffer */
 666   char                  buffer[1024];   /* Buffer */
 667 #  endif /* HAVE_AUTHORIZATION_H */
 668
 669
 670   DEBUG_printf(("7cups_local_auth(http=%p) hostaddr=%s, hostname=\"%s\"", (void *)http, httpAddrString(http->hostaddr, filename, sizeof(filename)), http->hostname));
 671
 672  /*
 673   * See if we are accessing localhost...
 674   */
 675
 676   if (!httpAddrLocalhost(http->hostaddr) &&
 677       _cups_strcasecmp(http->hostname, "localhost") != 0)
 678   {
 679     DEBUG_puts("8cups_local_auth: Not a local connection!");
 680     return (1);
 681   }
 682
 683 #  if defined(HAVE_AUTHORIZATION_H)
 684  /*
 685   * Delete any previous authorization reference...
 686   */
 687
 688   if (http->auth_ref)
 689   {
 690     AuthorizationFree(http->auth_ref, kAuthorizationFlagDefaults);
 691     http->auth_ref = NULL;
 692   }
 693
 694   if (!getenv("GATEWAY_INTERFACE") &&
 695       httpGetSubField2(http, HTTP_FIELD_WWW_AUTHENTICATE, "authkey",
 696                        auth_key, sizeof(auth_key)))
 697   {
 698     status = AuthorizationCreate(NULL, kAuthorizationEmptyEnvironment,
 699                                  kAuthorizationFlagDefaults, &http->auth_ref);
 700     if (status != errAuthorizationSuccess)
 701     {
 702       DEBUG_printf(("8cups_local_auth: AuthorizationCreate() returned %d (%s)",
 703                     (int)status, cssmErrorString(status)));
 704       return (-1);
 705     }
 706
 707     auth_right.name        = auth_key;
 708     auth_right.valueLength = 0;
 709     auth_right.value       = NULL;
 710     auth_right.flags       = 0;
 711
 712     auth_rights.count = 1;
 713     auth_rights.items = &auth_right;
 714
 715     auth_flags = kAuthorizationFlagDefaults |
 716                  kAuthorizationFlagPreAuthorize |
 717                  kAuthorizationFlagInteractionAllowed |
 718                  kAuthorizationFlagExtendRights;
 719
 720     status = AuthorizationCopyRights(http->auth_ref, &auth_rights,
 721                                      kAuthorizationEmptyEnvironment,
 722                                      auth_flags, NULL);
 723     if (status == errAuthorizationSuccess)
 724       status = AuthorizationMakeExternalForm(http->auth_ref, &auth_extrn);
 725
 726     if (status == errAuthorizationSuccess)
 727     {
 728      /*
 729       * Set the authorization string and return...
 730       */
 731
 732       httpEncode64_2(buffer, sizeof(buffer), (void *)&auth_extrn,
 733                      sizeof(auth_extrn));
 734
 735       httpSetAuthString(http, "AuthRef", buffer);
 736
 737       DEBUG_printf(("8cups_local_auth: Returning authstring=\"%s\"",
 738                     http->authstring));
 739       return (0);
 740     }
 741     else if (status == errAuthorizationCanceled)
 742       return (-1);
 743
 744     DEBUG_printf(("9cups_local_auth: AuthorizationCopyRights() returned %d (%s)",
 745                   (int)status, cssmErrorString(status)));
 746
 747   /*
 748    * Fall through to try certificates...
 749    */
 750   }
 751 #  endif /* HAVE_AUTHORIZATION_H */
 752
 753 #  if defined(SO_PEERCRED) && defined(AF_LOCAL)
 754  /*
 755   * See if we can authenticate using the peer credentials provided over a
 756   * domain socket; if so, specify "PeerCred username" as the authentication
 757   * information...
 758   */
 759
 760   if (
 761 #    ifdef HAVE_GSSAPI
 762       _cups_strncasecmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Negotiate", 9) &&
 763 #    endif /* HAVE_GSSAPI */
 764 #    ifdef HAVE_AUTHORIZATION_H
 765       !httpGetSubField2(http, HTTP_FIELD_WWW_AUTHENTICATE, "authkey",
 766                         auth_key, sizeof(auth_key)) &&
 767 #    endif /* HAVE_AUTHORIZATION_H */
 768       http->hostaddr->addr.sa_family == AF_LOCAL &&
 769       !getenv("GATEWAY_INTERFACE"))     /* Not via CGI programs... */
 770   {
 771    /*
 772     * Verify that the current cupsUser() matches the current UID...
 773     */
 774
 775     struct passwd       *pwd;           /* Password information */
 776     const char          *username;      /* Current username */
 777
 778     username = cupsUser();
 779
 780     if ((pwd = getpwnam(username)) != NULL && pwd->pw_uid == getuid())
 781     {
 782       httpSetAuthString(http, "PeerCred", username);
 783
 784       DEBUG_printf(("8cups_local_auth: Returning authstring=\"%s\"",
 785                     http->authstring));
 786
 787       return (0);
 788     }
 789   }
 790 #  endif /* SO_PEERCRED && AF_LOCAL */
 791
 792  /*
 793   * Try opening a certificate file for this PID.  If that fails,
 794   * try the root certificate...
 795   */
 796
 797   pid = getpid();
 798   snprintf(filename, sizeof(filename), "%s/certs/%d", cg->cups_statedir, pid);
 799   if ((fp = fopen(filename, "r")) == NULL && pid > 0)
 800   {
 801    /*
 802     * No certificate for this PID; see if we can get the root certificate...
 803     */
 804
 805     DEBUG_printf(("9cups_local_auth: Unable to open file %s: %s",
 806                   filename, strerror(errno)));
 807
 808 #  ifdef HAVE_GSSAPI
 809     if (!_cups_strncasecmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Negotiate", 9))
 810     {
 811      /*
 812       * Kerberos required, don't try the root certificate...
 813       */
 814
 815       return (1);
 816     }
 817 #  endif /* HAVE_GSSAPI */
 818
 819 #  ifdef HAVE_AUTHORIZATION_H
 820     if (httpGetSubField2(http, HTTP_FIELD_WWW_AUTHENTICATE, "authkey",
 821                          auth_key, sizeof(auth_key)))
 822     {
 823      /*
 824       * Don't use the root certificate as a replacement for an authkey...
 825       */
 826
 827       return (1);
 828     }
 829 #  endif /* HAVE_AUTHORIZATION_H */
 830     if (!httpGetSubField2(http, HTTP_FIELD_WWW_AUTHENTICATE, "trc", trc,
 831                           sizeof(trc)))
 832     {
 833      /*
 834       * Scheduler doesn't want us to use the root certificate...
 835       */
 836
 837       return (1);
 838     }
 839
 840     snprintf(filename, sizeof(filename), "%s/certs/0", cg->cups_statedir);
 841     fp = fopen(filename, "r");
 842   }
 843
 844   if (fp)
 845   {
 846    /*
 847     * Read the certificate from the file...
 848     */
 849
 850     char        certificate[33],        /* Certificate string */
 851                 *certptr;               /* Pointer to certificate string */
 852
 853     certptr = fgets(certificate, sizeof(certificate), fp);
 854     fclose(fp);
 855
 856     if (certptr)
 857     {
 858      /*
 859       * Set the authorization string and return...
 860       */
 861
 862       httpSetAuthString(http, "Local", certificate);
 863
 864       DEBUG_printf(("8cups_local_auth: Returning authstring=\"%s\"",
 865                     http->authstring));
 866
 867       return (0);
 868     }
 869   }
 870
 871   return (1);
 872 #endif /* WIN32 || __EMX__ */
 873 }
 874
 875
 876 /*
 877  * End of "$Id$".
 878  */