cups/auth.c

   1 /*
   2  * "$Id: auth.c 7720 2008-07-11 22:46:21Z mike $"
   3  *
   4  *   Authentication functions for CUPS.
   5  *
   6  *   Copyright 2007-2011 by Apple Inc.
   7  *   Copyright 1997-2007 by Easy Software Products.
   8  *
   9  *   This file contains Kerberos support code, copyright 2006 by
  10  *   Jelmer Vernooij.
  11  *
  12  *   These coded instructions, statements, and computer programs are the
  13  *   property of Apple Inc. and are protected by Federal copyright
  14  *   law.  Distribution and use rights are outlined in the file "LICENSE.txt"
  15  *   which should have been included with this file.  If this file is
  16  *   file is missing or damaged, see the license at "http://www.cups.org/".
  17  *
  18  *   This file is subject to the Apple OS-Developed Software exception.
  19  *
  20  * Contents:
  21  *
  22  *   cupsDoAuthentication()        - Authenticate a request.
  23  *   _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 #      define GSS_AUTH_IDENTITY_TYPE_1 1
  69 #      define gss_acquire_cred_ex_f __ApplePrivate_gss_acquire_cred_ex_f
  70 typedef struct gss_auth_identity
  71 {
  72   uint32_t type;
  73   uint32_t flags;
  74   char *username;
  75   char *realm;
  76   char *password;
  77   gss_buffer_t *credentialsRef;
  78 } gss_auth_identity_desc;
  79 extern OM_uint32 gss_acquire_cred_ex_f(gss_status_id_t, const gss_name_t,
  80                                        OM_uint32, OM_uint32, const gss_OID,
  81                                        gss_cred_usage_t, gss_auth_identity_t,
  82                                        void *, void (*)(void *, OM_uint32,
  83                                                         gss_status_id_t,
  84                                                         gss_cred_id_t,
  85                                                         gss_OID_set,
  86                                                         OM_uint32));
  87 #    endif /* HAVE_GSS_GSSAPI_SPI_H */
  88 #    include <dispatch/dispatch.h>
  89 typedef struct _cups_gss_acquire_s      /* Acquire callback data */
  90 {
  91   dispatch_semaphore_t  sem;            /* Synchronization semaphore */
  92   OM_uint32             major;          /* Returned status code */
  93   gss_cred_id_t         creds;          /* Returned credentials */
  94 } _cups_gss_acquire_t;
  95
  96 static void     cups_gss_acquire(void *ctx, OM_uint32 major,
  97                                  gss_status_id_t status,
  98                                  gss_cred_id_t creds, gss_OID_set oids,
  99                                  OM_uint32 time_rec);
 100 #  endif /* HAVE_GSS_ACQUIRE_CRED_EX_F */
 101 static gss_name_t cups_gss_getname(http_t *http, const char *service_name);
 102 #  ifdef DEBUG
 103 static void     cups_gss_printf(OM_uint32 major_status, OM_uint32 minor_status,
 104                                 const char *message);
 105 #  else
 106 #    define     cups_gss_printf(major, minor, message)
 107 #  endif /* DEBUG */
 108 #endif /* HAVE_GSSAPI */
 109 static int      cups_local_auth(http_t *http);
 110
 111
 112 /*
 113  * 'cupsDoAuthentication()' - Authenticate a request.
 114  *
 115  * This function should be called in response to a @code HTTP_UNAUTHORIZED@
 116  * status, prior to resubmitting your request.
 117  *
 118  * @since CUPS 1.1.20/Mac OS X 10.4@
 119  */
 120
 121 int                                     /* O - 0 on success, -1 on error */
 122 cupsDoAuthentication(
 123     http_t     *http,                   /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
 124     const char *method,                 /* I - Request method ("GET", "POST", "PUT") */
 125     const char *resource)               /* I - Resource path */
 126 {
 127   const char    *password,              /* Password string */
 128                 *www_auth;              /* WWW-Authenticate header */
 129   char          prompt[1024],           /* Prompt for user */
 130                 realm[HTTP_MAX_VALUE],  /* realm="xyz" string */
 131                 nonce[HTTP_MAX_VALUE];  /* nonce="xyz" string */
 132   int           localauth;              /* Local authentication result */
 133   _cups_globals_t *cg;                  /* Global data */
 134
 135
 136   DEBUG_printf(("cupsDoAuthentication(http=%p, method=\"%s\", resource=\"%s\")",
 137                 http, method, resource));
 138
 139   if (!http)
 140     http = _cupsConnect();
 141
 142   if (!http || !method || !resource)
 143     return (-1);
 144
 145   DEBUG_printf(("2cupsDoAuthentication: digest_tries=%d, userpass=\"%s\"",
 146                 http->digest_tries, http->userpass));
 147   DEBUG_printf(("2cupsDoAuthentication: WWW-Authenticate=\"%s\"",
 148                 httpGetField(http, HTTP_FIELD_WWW_AUTHENTICATE)));
 149
 150  /*
 151   * Clear the current authentication string...
 152   */
 153
 154   httpSetAuthString(http, NULL, NULL);
 155
 156  /*
 157   * See if we can do local authentication...
 158   */
 159
 160   if (http->digest_tries < 3)
 161   {
 162     if ((localauth = cups_local_auth(http)) == 0)
 163     {
 164       DEBUG_printf(("2cupsDoAuthentication: authstring=\"%s\"",
 165                     http->authstring));
 166
 167       if (http->status == HTTP_UNAUTHORIZED)
 168         http->digest_tries ++;
 169
 170       return (0);
 171     }
 172     else if (localauth == -1)
 173     {
 174       http->status = HTTP_AUTHORIZATION_CANCELED;
 175       return (-1);                      /* Error or canceled */
 176     }
 177   }
 178
 179  /*
 180   * Nope, see if we should retry the current username:password...
 181   */
 182
 183   www_auth = http->fields[HTTP_FIELD_WWW_AUTHENTICATE];
 184
 185   if ((http->digest_tries > 1 || !http->userpass[0]) &&
 186       (!_cups_strncasecmp(www_auth, "Basic", 5) ||
 187        !_cups_strncasecmp(www_auth, "Digest", 6)))
 188   {
 189    /*
 190     * Nope - get a new password from the user...
 191     */
 192
 193     cg = _cupsGlobals();
 194
 195     if (!cg->lang_default)
 196       cg->lang_default = cupsLangDefault();
 197
 198     snprintf(prompt, sizeof(prompt),
 199              _cupsLangString(cg->lang_default, _("Password for %s on %s? ")),
 200              cupsUser(),
 201              http->hostname[0] == '/' ? "localhost" : http->hostname);
 202
 203     http->digest_tries  = _cups_strncasecmp(www_auth, "Digest", 6) != 0;
 204     http->userpass[0]   = '\0';
 205
 206     if ((password = cupsGetPassword2(prompt, http, method, resource)) == NULL)
 207     {
 208       http->status = HTTP_AUTHORIZATION_CANCELED;
 209       return (-1);
 210     }
 211
 212     snprintf(http->userpass, sizeof(http->userpass), "%s:%s", cupsUser(),
 213              password);
 214   }
 215   else if (http->status == HTTP_UNAUTHORIZED)
 216     http->digest_tries ++;
 217
 218   if (http->status == HTTP_UNAUTHORIZED && http->digest_tries >= 3)
 219   {
 220     DEBUG_printf(("1cupsDoAuthentication: Too many authentication tries (%d)",
 221                   http->digest_tries));
 222
 223     http->status = HTTP_AUTHORIZATION_CANCELED;
 224     return (-1);
 225   }
 226
 227  /*
 228   * Got a password; encode it for the server...
 229   */
 230
 231 #ifdef HAVE_GSSAPI
 232   if (!_cups_strncasecmp(www_auth, "Negotiate", 9))
 233   {
 234    /*
 235     * Kerberos authentication...
 236     */
 237
 238     if (_cupsSetNegotiateAuthString(http, method, resource))
 239     {
 240       http->status = HTTP_AUTHORIZATION_CANCELED;
 241       return (-1);
 242     }
 243   }
 244   else
 245 #endif /* HAVE_GSSAPI */
 246   if (!_cups_strncasecmp(www_auth, "Basic", 5))
 247   {
 248    /*
 249     * Basic authentication...
 250     */
 251
 252     char        encode[256];            /* Base64 buffer */
 253
 254
 255     httpEncode64_2(encode, sizeof(encode), http->userpass,
 256                    (int)strlen(http->userpass));
 257     httpSetAuthString(http, "Basic", encode);
 258   }
 259   else if (!_cups_strncasecmp(www_auth, "Digest", 6))
 260   {
 261    /*
 262     * Digest authentication...
 263     */
 264
 265     char        encode[33],             /* MD5 buffer */
 266                 digest[1024];           /* Digest auth data */
 267
 268
 269     httpGetSubField(http, HTTP_FIELD_WWW_AUTHENTICATE, "realm", realm);
 270     httpGetSubField(http, HTTP_FIELD_WWW_AUTHENTICATE, "nonce", nonce);
 271
 272     httpMD5(cupsUser(), realm, strchr(http->userpass, ':') + 1, encode);
 273     httpMD5Final(nonce, method, resource, encode);
 274     snprintf(digest, sizeof(digest),
 275              "username=\"%s\", realm=\"%s\", nonce=\"%s\", uri=\"%s\", "
 276              "response=\"%s\"", cupsUser(), realm, nonce, resource, encode);
 277     httpSetAuthString(http, "Digest", digest);
 278   }
 279   else
 280   {
 281     DEBUG_printf(("1cupsDoAuthentication: Unknown auth type: \"%s\"",
 282                   www_auth));
 283     http->status = HTTP_AUTHORIZATION_CANCELED;
 284     return (-1);
 285   }
 286
 287   DEBUG_printf(("1cupsDoAuthentication: authstring=\"%s\"", http->authstring));
 288
 289   return (0);
 290 }
 291
 292
 293 #ifdef HAVE_GSSAPI
 294 /*
 295  * '_cupsSetNegotiateAuthString()' - Set the Kerberos authentication string.
 296  */
 297
 298 int                                     /* O - 0 on success, -1 on error */
 299 _cupsSetNegotiateAuthString(
 300     http_t     *http,                   /* I - Connection to server */
 301     const char *method,                 /* I - Request method ("GET", "POST", "PUT") */
 302     const char *resource)               /* I - Resource path */
 303 {
 304   OM_uint32     minor_status,           /* Minor status code */
 305                 major_status;           /* Major status code */
 306   gss_buffer_desc output_token = GSS_C_EMPTY_BUFFER;
 307                                         /* Output token */
 308
 309
 310   (void)method;
 311   (void)resource;
 312
 313 #  ifdef __APPLE__
 314  /*
 315   * If the weak-linked GSSAPI/Kerberos library is not present, don't try
 316   * to use it...
 317   */
 318
 319   if (gss_init_sec_context == NULL)
 320   {
 321     DEBUG_puts("1_cupsSetNegotiateAuthString: Weak-linked GSSAPI/Kerberos "
 322                "framework is not present");
 323     return (-1);
 324   }
 325 #  endif /* __APPLE__ */
 326
 327   if (http->gssname == GSS_C_NO_NAME)
 328   {
 329     http->gssname = cups_gss_getname(http, _cupsGSSServiceName());
 330   }
 331
 332   if (http->gssctx != GSS_C_NO_CONTEXT)
 333   {
 334     gss_delete_sec_context(&minor_status, &http->gssctx, GSS_C_NO_BUFFER);
 335     http->gssctx = GSS_C_NO_CONTEXT;
 336   }
 337
 338   major_status = gss_init_sec_context(&minor_status, GSS_C_NO_CREDENTIAL,
 339                                       &http->gssctx,
 340                                       http->gssname, http->gssmech,
 341                                       GSS_C_MUTUAL_FLAG | GSS_C_INTEG_FLAG,
 342                                       GSS_C_INDEFINITE,
 343                                       GSS_C_NO_CHANNEL_BINDINGS,
 344                                       GSS_C_NO_BUFFER, &http->gssmech,
 345                                       &output_token, NULL, NULL);
 346
 347 #ifdef HAVE_GSS_ACQUIRE_CRED_EX_F
 348   if (major_status == GSS_S_NO_CRED)
 349   {
 350    /*
 351     * Ask the user for credentials...
 352     */
 353
 354     char                prompt[1024],   /* Prompt for user */
 355                         userbuf[256];   /* Kerberos username */
 356     const char          *username,      /* Username string */
 357                         *password;      /* Password string */
 358     _cups_gss_acquire_t data;           /* Callback data */
 359     gss_auth_identity_desc identity;    /* Kerberos user identity */
 360     _cups_globals_t     *cg = _cupsGlobals();
 361                                         /* Per-thread global data */
 362
 363     if (!cg->lang_default)
 364       cg->lang_default = cupsLangDefault();
 365
 366     snprintf(prompt, sizeof(prompt),
 367              _cupsLangString(cg->lang_default, _("Password for %s on %s? ")),
 368              cupsUser(), http->gsshost);
 369
 370     if ((password = cupsGetPassword2(prompt, http, method, resource)) == NULL)
 371       return (-1);
 372
 373    /*
 374     * Try to acquire credentials...
 375     */
 376
 377     username = cupsUser();
 378     if (!strchr(username, '@'))
 379     {
 380       snprintf(userbuf, sizeof(userbuf), "%s@%s", username, http->gsshost);
 381       username = userbuf;
 382     }
 383
 384     identity.type           = GSS_AUTH_IDENTITY_TYPE_1;
 385     identity.flags          = 0;
 386     identity.username       = (char *)username;
 387     identity.realm          = (char *)"";
 388     identity.password       = (char *)password;
 389     identity.credentialsRef = NULL;
 390
 391     data.sem   = dispatch_semaphore_create(0);
 392     data.major = 0;
 393     data.creds = NULL;
 394
 395     if (data.sem)
 396     {
 397       major_status = gss_acquire_cred_ex_f(NULL, GSS_C_NO_NAME, 0,
 398                                            GSS_C_INDEFINITE, GSS_KRB5_MECHANISM,
 399                                            GSS_C_INITIATE, &identity, &data,
 400                                            cups_gss_acquire);
 401
 402       if (major_status == GSS_S_COMPLETE)
 403       {
 404         dispatch_semaphore_wait(data.sem, DISPATCH_TIME_FOREVER);
 405         major_status = data.major;
 406       }
 407
 408       dispatch_release(data.sem);
 409
 410       if (major_status == GSS_S_COMPLETE)
 411       {
 412         OM_uint32       release_minor;  /* Minor status from releasing creds */
 413
 414         major_status = gss_init_sec_context(&minor_status, data.creds,
 415                                             &http->gssctx,
 416                                             http->gssname, http->gssmech,
 417                                             GSS_C_MUTUAL_FLAG | GSS_C_INTEG_FLAG,
 418                                             GSS_C_INDEFINITE,
 419                                             GSS_C_NO_CHANNEL_BINDINGS,
 420                                             GSS_C_NO_BUFFER, &http->gssmech,
 421                                             &output_token, NULL, NULL);
 422         gss_release_cred(&release_minor, &data.creds);
 423       }
 424     }
 425   }
 426 #endif /* HAVE_GSS_ACQUIRED_CRED_EX_F */
 427
 428   if (GSS_ERROR(major_status))
 429   {
 430     cups_gss_printf(major_status, minor_status,
 431                     "_cupsSetNegotiateAuthString: Unable to initialize "
 432                     "security context");
 433     return (-1);
 434   }
 435
 436 #ifdef DEBUG
 437   else if (major_status == GSS_S_CONTINUE_NEEDED)
 438     cups_gss_printf(major_status, minor_status,
 439                     "_cupsSetNegotiateAuthString: Continuation needed!");
 440 #endif /* DEBUG */
 441
 442   if (output_token.length > 0 && output_token.length <= 65536)
 443   {
 444    /*
 445     * Allocate the authorization string since Windows KDCs can have
 446     * arbitrarily large credentials...
 447     */
 448
 449     int authsize = 10 +                         /* "Negotiate " */
 450                    output_token.length * 4 / 3 + 1 +    /* Base64 */
 451                    1;                                   /* nul */
 452
 453     httpSetAuthString(http, NULL, NULL);
 454
 455     if ((http->authstring = malloc(authsize)) == NULL)
 456     {
 457       http->authstring = http->_authstring;
 458       authsize         = sizeof(http->_authstring);
 459     }
 460
 461     strcpy(http->authstring, "Negotiate ");
 462     httpEncode64_2(http->authstring + 10, authsize - 10, output_token.value,
 463                    output_token.length);
 464
 465     gss_release_buffer(&minor_status, &output_token);
 466   }
 467   else
 468   {
 469     DEBUG_printf(("1_cupsSetNegotiateAuthString: Kerberos credentials too "
 470                   "large - %d bytes!", (int)output_token.length));
 471     gss_release_buffer(&minor_status, &output_token);
 472
 473     return (-1);
 474   }
 475
 476   return (0);
 477 }
 478
 479
 480 #  ifdef HAVE_GSS_ACQUIRE_CRED_EX_F
 481 /*
 482  * 'cups_gss_acquire()' - Kerberos credentials callback.
 483  */
 484 static void
 485 cups_gss_acquire(
 486     void            *ctx,               /* I - Caller context */
 487     OM_uint32       major,              /* I - Major error code */
 488     gss_status_id_t status,             /* I - Status (unused) */
 489     gss_cred_id_t   creds,              /* I - Credentials (if any) */
 490     gss_OID_set     oids,               /* I - Mechanism OIDs (unused) */
 491     OM_uint32       time_rec)           /* I - Timestamp (unused) */
 492 {
 493   uint32_t              min;            /* Minor error code */
 494   _cups_gss_acquire_t   *data;          /* Callback data */
 495
 496
 497   (void)status;
 498   (void)time_rec;
 499
 500   data        = (_cups_gss_acquire_t *)ctx;
 501   data->major = major;
 502   data->creds = creds;
 503
 504   gss_release_oid_set(&min, &oids);
 505   dispatch_semaphore_signal(data->sem);
 506 }
 507 #  endif /* HAVE_GSS_ACQUIRE_CRED_EX_F */
 508
 509
 510 /*
 511  * 'cups_gss_getname()' - Get CUPS service credentials for authentication.
 512  */
 513
 514 static gss_name_t                       /* O - Server name */
 515 cups_gss_getname(
 516     http_t     *http,                   /* I - Connection to server */
 517     const char *service_name)           /* I - Service name */
 518 {
 519   gss_buffer_desc token = GSS_C_EMPTY_BUFFER;
 520                                         /* Service token */
 521   OM_uint32       major_status,         /* Major status code */
 522                   minor_status;         /* Minor status code */
 523   gss_name_t      server_name;          /* Server name */
 524   char            buf[1024];            /* Name buffer */
 525
 526
 527   DEBUG_printf(("7cups_gss_getname(http=%p, service_name=\"%s\")", http,
 528                 service_name));
 529
 530
 531  /*
 532   * Get the hostname...
 533   */
 534
 535   if (!http->gsshost[0])
 536   {
 537     httpGetHostname(http, http->gsshost, sizeof(http->gsshost));
 538
 539     if (!strcmp(http->gsshost, "localhost"))
 540     {
 541       if (gethostname(http->gsshost, sizeof(http->gsshost)) < 0)
 542       {
 543         DEBUG_printf(("1cups_gss_getname: gethostname() failed: %s",
 544                       strerror(errno)));
 545         http->gsshost[0] = '\0';
 546         return (NULL);
 547       }
 548
 549       if (!strchr(http->gsshost, '.'))
 550       {
 551        /*
 552         * The hostname is not a FQDN, so look it up...
 553         */
 554
 555         struct hostent  *host;          /* Host entry to get FQDN */
 556
 557         if ((host = gethostbyname(http->gsshost)) != NULL && host->h_name)
 558         {
 559          /*
 560           * Use the resolved hostname...
 561           */
 562
 563           strlcpy(http->gsshost, host->h_name, sizeof(http->gsshost));
 564         }
 565         else
 566         {
 567           DEBUG_printf(("1cups_gss_getname: gethostbyname(\"%s\") failed.",
 568                         http->gsshost));
 569           http->gsshost[0] = '\0';
 570           return (NULL);
 571         }
 572       }
 573     }
 574   }
 575
 576  /*
 577   * Get a service name we can use for authentication purposes...
 578   */
 579
 580   snprintf(buf, sizeof(buf), "%s@%s", service_name, http->gsshost);
 581
 582   DEBUG_printf(("8cups_gss_getname: Looking up \"%s\".", buf));
 583
 584   token.value  = buf;
 585   token.length = strlen(buf);
 586   server_name  = GSS_C_NO_NAME;
 587   major_status = gss_import_name(&minor_status, &token,
 588                                  GSS_C_NT_HOSTBASED_SERVICE,
 589                                  &server_name);
 590
 591   if (GSS_ERROR(major_status))
 592   {
 593     cups_gss_printf(major_status, minor_status,
 594                     "cups_gss_getname: gss_import_name() failed");
 595     return (NULL);
 596   }
 597
 598   return (server_name);
 599 }
 600
 601
 602 #  ifdef DEBUG
 603 /*
 604  * 'cups_gss_printf()' - Show debug error messages from GSSAPI.
 605  */
 606
 607 static void
 608 cups_gss_printf(OM_uint32  major_status,/* I - Major status code */
 609                 OM_uint32  minor_status,/* I - Minor status code */
 610                 const char *message)    /* I - Prefix for error message */
 611 {
 612   OM_uint32     err_major_status,       /* Major status code for display */
 613                 err_minor_status;       /* Minor status code for display */
 614   OM_uint32     msg_ctx;                /* Message context */
 615   gss_buffer_desc major_status_string = GSS_C_EMPTY_BUFFER,
 616                                         /* Major status message */
 617                 minor_status_string = GSS_C_EMPTY_BUFFER;
 618                                         /* Minor status message */
 619
 620
 621   msg_ctx          = 0;
 622   err_major_status = gss_display_status(&err_minor_status,
 623                                         major_status,
 624                                         GSS_C_GSS_CODE,
 625                                         GSS_C_NO_OID,
 626                                         &msg_ctx,
 627                                         &major_status_string);
 628
 629   if (!GSS_ERROR(err_major_status))
 630     gss_display_status(&err_minor_status, minor_status, GSS_C_MECH_CODE,
 631                        GSS_C_NULL_OID, &msg_ctx, &minor_status_string);
 632
 633   DEBUG_printf(("1%s: %s, %s", message, (char *)major_status_string.value,
 634                 (char *)minor_status_string.value));
 635
 636   gss_release_buffer(&err_minor_status, &major_status_string);
 637   gss_release_buffer(&err_minor_status, &minor_status_string);
 638 }
 639 #  endif /* DEBUG */
 640 #endif /* HAVE_GSSAPI */
 641
 642
 643 /*
 644  * 'cups_local_auth()' - Get the local authorization certificate if
 645  *                       available/applicable.
 646  */
 647
 648 static int                              /* O - 0 if available */
 649                                         /*     1 if not available */
 650                                         /*    -1 error */
 651 cups_local_auth(http_t *http)           /* I - HTTP connection to server */
 652 {
 653 #if defined(WIN32) || defined(__EMX__)
 654  /*
 655   * Currently WIN32 and OS-2 do not support the CUPS server...
 656   */
 657
 658   return (1);
 659 #else
 660   int                   pid;            /* Current process ID */
 661   FILE                  *fp;            /* Certificate file */
 662   char                  trc[16],        /* Try Root Certificate parameter */
 663                         filename[1024], /* Certificate filename */
 664                         certificate[33];/* Certificate string */
 665   _cups_globals_t *cg = _cupsGlobals(); /* Global data */
 666 #  if defined(HAVE_AUTHORIZATION_H)
 667   OSStatus              status;         /* Status */
 668   AuthorizationItem     auth_right;     /* Authorization right */
 669   AuthorizationRights   auth_rights;    /* Authorization rights */
 670   AuthorizationFlags    auth_flags;     /* Authorization flags */
 671   AuthorizationExternalForm auth_extrn; /* Authorization ref external */
 672   char                  auth_key[1024]; /* Buffer */
 673   char                  buffer[1024];   /* Buffer */
 674 #  endif /* HAVE_AUTHORIZATION_H */
 675
 676
 677   DEBUG_printf(("7cups_local_auth(http=%p) hostaddr=%s, hostname=\"%s\"",
 678                 http, httpAddrString(http->hostaddr, filename, sizeof(filename)), http->hostname));
 679
 680  /*
 681   * See if we are accessing localhost...
 682   */
 683
 684   if (!httpAddrLocalhost(http->hostaddr) &&
 685       _cups_strcasecmp(http->hostname, "localhost") != 0)
 686   {
 687     DEBUG_puts("8cups_local_auth: Not a local connection!");
 688     return (1);
 689   }
 690
 691 #  if defined(HAVE_AUTHORIZATION_H)
 692  /*
 693   * Delete any previous authorization reference...
 694   */
 695
 696   if (http->auth_ref)
 697   {
 698     AuthorizationFree(http->auth_ref, kAuthorizationFlagDefaults);
 699     http->auth_ref = NULL;
 700   }
 701
 702   if (!getenv("GATEWAY_INTERFACE") &&
 703       httpGetSubField2(http, HTTP_FIELD_WWW_AUTHENTICATE, "authkey",
 704                        auth_key, sizeof(auth_key)))
 705   {
 706     status = AuthorizationCreate(NULL, kAuthorizationEmptyEnvironment,
 707                                  kAuthorizationFlagDefaults, &http->auth_ref);
 708     if (status != errAuthorizationSuccess)
 709     {
 710       DEBUG_printf(("8cups_local_auth: AuthorizationCreate() returned %d (%s)",
 711                     (int)status, cssmErrorString(status)));
 712       return (-1);
 713     }
 714
 715     auth_right.name        = auth_key;
 716     auth_right.valueLength = 0;
 717     auth_right.value       = NULL;
 718     auth_right.flags       = 0;
 719
 720     auth_rights.count = 1;
 721     auth_rights.items = &auth_right;
 722
 723     auth_flags = kAuthorizationFlagDefaults |
 724                  kAuthorizationFlagPreAuthorize |
 725                  kAuthorizationFlagInteractionAllowed |
 726                  kAuthorizationFlagExtendRights;
 727
 728     status = AuthorizationCopyRights(http->auth_ref, &auth_rights,
 729                                      kAuthorizationEmptyEnvironment,
 730                                      auth_flags, NULL);
 731     if (status == errAuthorizationSuccess)
 732       status = AuthorizationMakeExternalForm(http->auth_ref, &auth_extrn);
 733
 734     if (status == errAuthorizationSuccess)
 735     {
 736      /*
 737       * Set the authorization string and return...
 738       */
 739
 740       httpEncode64_2(buffer, sizeof(buffer), (void *)&auth_extrn,
 741                      sizeof(auth_extrn));
 742
 743       httpSetAuthString(http, "AuthRef", buffer);
 744
 745       DEBUG_printf(("8cups_local_auth: Returning authstring=\"%s\"",
 746                     http->authstring));
 747       return (0);
 748     }
 749     else if (status == errAuthorizationCanceled)
 750       return (-1);
 751
 752     DEBUG_printf(("9cups_local_auth: AuthorizationCopyRights() returned %d (%s)",
 753                   (int)status, cssmErrorString(status)));
 754
 755   /*
 756    * Fall through to try certificates...
 757    */
 758   }
 759 #  endif /* HAVE_AUTHORIZATION_H */
 760
 761 #  if defined(SO_PEERCRED) && defined(AF_LOCAL)
 762  /*
 763   * See if we can authenticate using the peer credentials provided over a
 764   * domain socket; if so, specify "PeerCred username" as the authentication
 765   * information...
 766   */
 767
 768   if (
 769 #    ifdef HAVE_GSSAPI
 770       strncmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Negotiate", 9) &&
 771 #    endif /* HAVE_GSSAPI */
 772 #    ifdef HAVE_AUTHORIZATION_H
 773       !httpGetSubField2(http, HTTP_FIELD_WWW_AUTHENTICATE, "authkey",
 774                         auth_key, sizeof(auth_key)) &&
 775 #    endif /* HAVE_AUTHORIZATION_H */
 776       http->hostaddr->addr.sa_family == AF_LOCAL &&
 777       !getenv("GATEWAY_INTERFACE"))     /* Not via CGI programs... */
 778   {
 779    /*
 780     * Verify that the current cupsUser() matches the current UID...
 781     */
 782
 783     struct passwd       *pwd;           /* Password information */
 784     const char          *username;      /* Current username */
 785
 786     username = cupsUser();
 787
 788     if ((pwd = getpwnam(username)) != NULL && pwd->pw_uid == getuid())
 789     {
 790       httpSetAuthString(http, "PeerCred", username);
 791
 792       DEBUG_printf(("8cups_local_auth: Returning authstring=\"%s\"",
 793                     http->authstring));
 794
 795       return (0);
 796     }
 797   }
 798 #  endif /* SO_PEERCRED && AF_LOCAL */
 799
 800  /*
 801   * Try opening a certificate file for this PID.  If that fails,
 802   * try the root certificate...
 803   */
 804
 805   pid = getpid();
 806   snprintf(filename, sizeof(filename), "%s/certs/%d", cg->cups_statedir, pid);
 807   if ((fp = fopen(filename, "r")) == NULL && pid > 0)
 808   {
 809    /*
 810     * No certificate for this PID; see if we can get the root certificate...
 811     */
 812
 813     DEBUG_printf(("9cups_local_auth: Unable to open file %s: %s",
 814                   filename, strerror(errno)));
 815
 816 #  ifdef HAVE_GSSAPI
 817     if (!strncmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Negotiate", 9))
 818     {
 819      /*
 820       * Kerberos required, don't try the root certificate...
 821       */
 822
 823       return (1);
 824     }
 825 #  endif /* HAVE_GSSAPI */
 826
 827 #  ifdef HAVE_AUTHORIZATION_H
 828     if (httpGetSubField2(http, HTTP_FIELD_WWW_AUTHENTICATE, "authkey",
 829                          auth_key, sizeof(auth_key)))
 830     {
 831      /*
 832       * Don't use the root certificate as a replacement for an authkey...
 833       */
 834
 835       return (1);
 836     }
 837 #  endif /* HAVE_AUTHORIZATION_H */
 838     if (!httpGetSubField2(http, HTTP_FIELD_WWW_AUTHENTICATE, "trc", trc,
 839                           sizeof(trc)))
 840     {
 841      /*
 842       * Scheduler doesn't want us to use the root certificate...
 843       */
 844
 845       return (1);
 846     }
 847
 848     snprintf(filename, sizeof(filename), "%s/certs/0", cg->cups_statedir);
 849     fp = fopen(filename, "r");
 850   }
 851
 852   if (fp)
 853   {
 854    /*
 855     * Read the certificate from the file...
 856     */
 857
 858     fgets(certificate, sizeof(certificate), fp);
 859     fclose(fp);
 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   return (1);
 874 #endif /* WIN32 || __EMX__ */
 875 }
 876
 877
 878 /*
 879  * End of "$Id: auth.c 7720 2008-07-11 22:46:21Z mike $".
 880  */