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 typedef struct gss_auth_identity
  69 {
  70   uint32_t type;
  71   uint32_t flags;
  72   char *username;
  73   char *realm;
  74   char *password;
  75   gss_buffer_t *credentialsRef;
  76 } gss_auth_identity_desc;
  77 extern OM_uint32 gss_acquire_cred_ex_f(gss_status_id_t, const gss_name_t,
  78                                        OM_uint32, OM_uint32, const gss_OID,
  79                                        gss_cred_usage_t, gss_auth_identity_t,
  80                                        void *, void (*)(void *, OM_uint32,
  81                                                         gss_status_id_t,
  82                                                         gss_cred_id_t,
  83                                                         gss_OID_set,
  84                                                         OM_uint32));
  85 #    endif /* HAVE_GSS_GSSAPI_SPI_H */
  86 #    include <dispatch/dispatch.h>
  87 typedef struct _cups_gss_acquire_s      /* Acquire callback data */
  88 {
  89   dispatch_semaphore_t  sem;            /* Synchronization semaphore */
  90   OM_uint32             major;          /* Returned status code */
  91   gss_cred_id_t         creds;          /* Returned credentials */
  92 } _cups_gss_acquire_t;
  93
  94 static void     cups_gss_acquire(void *ctx, OM_uint32 major,
  95                                  gss_status_id_t status,
  96                                  gss_cred_id_t creds, gss_OID_set oids,
  97                                  OM_uint32 time_rec);
  98 #  endif /* HAVE_GSS_ACQUIRE_CRED_EX_F */
  99 static gss_name_t cups_gss_getname(http_t *http, const char *service_name);
 100 #  ifdef DEBUG
 101 static void     cups_gss_printf(OM_uint32 major_status, OM_uint32 minor_status,
 102                                 const char *message);
 103 #  else
 104 #    define     cups_gss_printf(major, minor, message)
 105 #  endif /* DEBUG */
 106 #endif /* HAVE_GSSAPI */
 107 static int      cups_local_auth(http_t *http);
 108
 109
 110 /*
 111  * 'cupsDoAuthentication()' - Authenticate a request.
 112  *
 113  * This function should be called in response to a @code HTTP_UNAUTHORIZED@
 114  * status, prior to resubmitting your request.
 115  *
 116  * @since CUPS 1.1.20/Mac OS X 10.4@
 117  */
 118
 119 int                                     /* O - 0 on success, -1 on error */
 120 cupsDoAuthentication(
 121     http_t     *http,                   /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
 122     const char *method,                 /* I - Request method ("GET", "POST", "PUT") */
 123     const char *resource)               /* I - Resource path */
 124 {
 125   const char    *password;              /* Password string */
 126   char          prompt[1024],           /* Prompt for user */
 127                 realm[HTTP_MAX_VALUE],  /* realm="xyz" string */
 128                 nonce[HTTP_MAX_VALUE];  /* nonce="xyz" string */
 129   int           localauth;              /* Local authentication result */
 130   _cups_globals_t *cg;                  /* Global data */
 131
 132
 133   DEBUG_printf(("cupsDoAuthentication(http=%p, method=\"%s\", resource=\"%s\")",
 134                 http, method, resource));
 135
 136   if (!http)
 137     http = _cupsConnect();
 138
 139   if (!http || !method || !resource)
 140     return (-1);
 141
 142   DEBUG_printf(("2cupsDoAuthentication: digest_tries=%d, userpass=\"%s\"",
 143                 http->digest_tries, http->userpass));
 144   DEBUG_printf(("2cupsDoAuthentication: WWW-Authenticate=\"%s\"",
 145                 httpGetField(http, HTTP_FIELD_WWW_AUTHENTICATE)));
 146
 147  /*
 148   * Clear the current authentication string...
 149   */
 150
 151   httpSetAuthString(http, NULL, NULL);
 152
 153  /*
 154   * See if we can do local authentication...
 155   */
 156
 157   if (http->digest_tries < 3)
 158   {
 159     if ((localauth = cups_local_auth(http)) == 0)
 160     {
 161       DEBUG_printf(("2cupsDoAuthentication: authstring=\"%s\"",
 162                     http->authstring));
 163
 164       if (http->status == HTTP_UNAUTHORIZED)
 165         http->digest_tries ++;
 166
 167       return (0);
 168     }
 169     else if (localauth == -1)
 170     {
 171       http->status = HTTP_AUTHORIZATION_CANCELED;
 172       return (-1);                      /* Error or canceled */
 173     }
 174   }
 175
 176  /*
 177   * Nope, see if we should retry the current username:password...
 178   */
 179
 180   if ((http->digest_tries > 1 || !http->userpass[0]) &&
 181       (!strncmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Basic", 5) ||
 182        !strncmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Digest", 6)))
 183   {
 184    /*
 185     * Nope - get a new password from the user...
 186     */
 187
 188     cg = _cupsGlobals();
 189
 190     if (!cg->lang_default)
 191       cg->lang_default = cupsLangDefault();
 192
 193     snprintf(prompt, sizeof(prompt),
 194              _cupsLangString(cg->lang_default, _("Password for %s on %s? ")),
 195              cupsUser(),
 196              http->hostname[0] == '/' ? "localhost" : http->hostname);
 197
 198     http->digest_tries  = _cups_strncasecmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE],
 199                                       "Digest", 5) != 0;
 200     http->userpass[0]   = '\0';
 201
 202     if ((password = cupsGetPassword2(prompt, http, method, resource)) == NULL)
 203     {
 204       http->status = HTTP_AUTHORIZATION_CANCELED;
 205       return (-1);
 206     }
 207
 208     snprintf(http->userpass, sizeof(http->userpass), "%s:%s", cupsUser(),
 209              password);
 210   }
 211   else if (http->status == HTTP_UNAUTHORIZED)
 212     http->digest_tries ++;
 213
 214   if (http->status == HTTP_UNAUTHORIZED && http->digest_tries >= 3)
 215   {
 216     DEBUG_printf(("1cupsDoAuthentication: Too many authentication tries (%d)",
 217                   http->digest_tries));
 218
 219     http->status = HTTP_AUTHORIZATION_CANCELED;
 220     return (-1);
 221   }
 222
 223  /*
 224   * Got a password; encode it for the server...
 225   */
 226
 227 #ifdef HAVE_GSSAPI
 228   if (!strncmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Negotiate", 9))
 229   {
 230    /*
 231     * Kerberos authentication...
 232     */
 233
 234     if (_cupsSetNegotiateAuthString(http, method, resource))
 235     {
 236       http->status = HTTP_AUTHORIZATION_CANCELED;
 237       return (-1);
 238     }
 239   }
 240   else
 241 #endif /* HAVE_GSSAPI */
 242   if (!strncmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Basic", 5))
 243   {
 244    /*
 245     * Basic authentication...
 246     */
 247
 248     char        encode[256];            /* Base64 buffer */
 249
 250
 251     httpEncode64_2(encode, sizeof(encode), http->userpass,
 252                    (int)strlen(http->userpass));
 253     httpSetAuthString(http, "Basic", encode);
 254   }
 255   else if (!strncmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Digest", 6))
 256   {
 257    /*
 258     * Digest authentication...
 259     */
 260
 261     char        encode[33],             /* MD5 buffer */
 262                 digest[1024];           /* Digest auth data */
 263
 264
 265     httpGetSubField(http, HTTP_FIELD_WWW_AUTHENTICATE, "realm", realm);
 266     httpGetSubField(http, HTTP_FIELD_WWW_AUTHENTICATE, "nonce", nonce);
 267
 268     httpMD5(cupsUser(), realm, strchr(http->userpass, ':') + 1, encode);
 269     httpMD5Final(nonce, method, resource, encode);
 270     snprintf(digest, sizeof(digest),
 271              "username=\"%s\", realm=\"%s\", nonce=\"%s\", uri=\"%s\", "
 272              "response=\"%s\"", cupsUser(), realm, nonce, resource, encode);
 273     httpSetAuthString(http, "Digest", digest);
 274   }
 275   else
 276   {
 277     DEBUG_printf(("1cupsDoAuthentication: Unknown auth type: \"%s\"",
 278                   http->fields[HTTP_FIELD_WWW_AUTHENTICATE]));
 279     http->status = HTTP_AUTHORIZATION_CANCELED;
 280     return (-1);
 281   }
 282
 283   DEBUG_printf(("1cupsDoAuthentication: authstring=\"%s\"", http->authstring));
 284
 285   return (0);
 286 }
 287
 288
 289 #ifdef HAVE_GSSAPI
 290 /*
 291  * '_cupsSetNegotiateAuthString()' - Set the Kerberos authentication string.
 292  */
 293
 294 int                                     /* O - 0 on success, -1 on error */
 295 _cupsSetNegotiateAuthString(
 296     http_t     *http,                   /* I - Connection to server */
 297     const char *method,                 /* I - Request method ("GET", "POST", "PUT") */
 298     const char *resource)               /* I - Resource path */
 299 {
 300   OM_uint32     minor_status,           /* Minor status code */
 301                 major_status;           /* Major status code */
 302   gss_buffer_desc output_token = GSS_C_EMPTY_BUFFER;
 303                                         /* Output token */
 304
 305
 306   (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   else
 423 #endif /* HAVE_GSS_ACQUIRED_CRED_EX_F */
 424
 425   if (GSS_ERROR(major_status))
 426   {
 427     cups_gss_printf(major_status, minor_status,
 428                     "_cupsSetNegotiateAuthString: Unable to initialize "
 429                     "security context");
 430     return (-1);
 431   }
 432
 433 #ifdef DEBUG
 434   else if (major_status == GSS_S_CONTINUE_NEEDED)
 435     cups_gss_printf(major_status, minor_status,
 436                     "_cupsSetNegotiateAuthString: Continuation needed!");
 437 #endif /* DEBUG */
 438
 439   if (output_token.length > 0 && output_token.length <= 65536)
 440   {
 441    /*
 442     * Allocate the authorization string since Windows KDCs can have
 443     * arbitrarily large credentials...
 444     */
 445
 446     int authsize = 10 +                         /* "Negotiate " */
 447                    output_token.length * 4 / 3 + 1 +    /* Base64 */
 448                    1;                                   /* nul */
 449
 450     httpSetAuthString(http, NULL, NULL);
 451
 452     if ((http->authstring = malloc(authsize)) == NULL)
 453     {
 454       http->authstring = http->_authstring;
 455       authsize         = sizeof(http->_authstring);
 456     }
 457
 458     strcpy(http->authstring, "Negotiate ");
 459     httpEncode64_2(http->authstring + 10, authsize - 10, output_token.value,
 460                    output_token.length);
 461
 462     gss_release_buffer(&minor_status, &output_token);
 463   }
 464   else
 465   {
 466     DEBUG_printf(("1_cupsSetNegotiateAuthString: Kerberos credentials too "
 467                   "large - %d bytes!", (int)output_token.length));
 468     gss_release_buffer(&minor_status, &output_token);
 469
 470     return (-1);
 471   }
 472
 473   return (0);
 474 }
 475
 476
 477 #  ifdef HAVE_GSS_ACQUIRE_CRED_EX_F
 478 /*
 479  * 'cups_gss_acquire()' - Kerberos credentials callback.
 480  */
 481 static void
 482 cups_gss_acquire(
 483     void            *ctx,               /* I - Caller context */
 484     OM_uint32       major,              /* I - Major error code */
 485     gss_status_id_t status,             /* I - Status (unused) */
 486     gss_cred_id_t   creds,              /* I - Credentials (if any) */
 487     gss_OID_set     oids,               /* I - Mechanism OIDs (unused) */
 488     OM_uint32       time_rec)           /* I - Timestamp (unused) */
 489 {
 490   uint32_t              min;            /* Minor error code */
 491   _cups_gss_acquire_t   *data;          /* Callback data */
 492
 493
 494   (void)status;
 495   (void)time_rec;
 496
 497   data        = (_cups_gss_acquire_t *)ctx;
 498   data->major = major;
 499   data->creds = creds;
 500
 501   gss_release_oid_set(&min, &oids);
 502   dispatch_semaphore_signal(data->sem);
 503 }
 504 #  endif /* HAVE_GSS_ACQUIRE_CRED_EX_F */
 505
 506
 507 /*
 508  * 'cups_gss_getname()' - Get CUPS service credentials for authentication.
 509  */
 510
 511 static gss_name_t                       /* O - Server name */
 512 cups_gss_getname(
 513     http_t     *http,                   /* I - Connection to server */
 514     const char *service_name)           /* I - Service name */
 515 {
 516   gss_buffer_desc token = GSS_C_EMPTY_BUFFER;
 517                                         /* Service token */
 518   OM_uint32       major_status,         /* Major status code */
 519                   minor_status;         /* Minor status code */
 520   gss_name_t      server_name;          /* Server name */
 521   char            buf[1024];            /* Name buffer */
 522
 523
 524   DEBUG_printf(("7cups_gss_getname(http=%p, service_name=\"%s\")", http,
 525                 service_name));
 526
 527
 528  /*
 529   * Get the hostname...
 530   */
 531
 532   if (!http->gsshost[0])
 533   {
 534     httpGetHostname(http, http->gsshost, sizeof(http->gsshost));
 535
 536     if (!strcmp(http->gsshost, "localhost"))
 537     {
 538       if (gethostname(http->gsshost, sizeof(http->gsshost)) < 0)
 539       {
 540         DEBUG_printf(("1cups_gss_getname: gethostname() failed: %s",
 541                       strerror(errno)));
 542         http->gsshost[0] = '\0';
 543         return (NULL);
 544       }
 545
 546       if (!strchr(http->gsshost, '.'))
 547       {
 548        /*
 549         * The hostname is not a FQDN, so look it up...
 550         */
 551
 552         struct hostent  *host;          /* Host entry to get FQDN */
 553
 554         if ((host = gethostbyname(http->gsshost)) != NULL && host->h_name)
 555         {
 556          /*
 557           * Use the resolved hostname...
 558           */
 559
 560           strlcpy(http->gsshost, host->h_name, sizeof(http->gsshost));
 561         }
 562         else
 563         {
 564           DEBUG_printf(("1cups_gss_getname: gethostbyname(\"%s\") failed.",
 565                         http->gsshost));
 566           http->gsshost[0] = '\0';
 567           return (NULL);
 568         }
 569       }
 570     }
 571   }
 572
 573  /*
 574   * Get a service name we can use for authentication purposes...
 575   */
 576
 577   snprintf(buf, sizeof(buf), "%s@%s", service_name, http->gsshost);
 578
 579   DEBUG_printf(("8cups_gss_getname: Looking up \"%s\".", buf));
 580
 581   token.value  = buf;
 582   token.length = strlen(buf);
 583   server_name  = GSS_C_NO_NAME;
 584   major_status = gss_import_name(&minor_status, &token,
 585                                  GSS_C_NT_HOSTBASED_SERVICE,
 586                                  &server_name);
 587
 588   if (GSS_ERROR(major_status))
 589   {
 590     cups_gss_printf(major_status, minor_status,
 591                     "cups_gss_getname: gss_import_name() failed");
 592     return (NULL);
 593   }
 594
 595   return (server_name);
 596 }
 597
 598
 599 #  ifdef DEBUG
 600 /*
 601  * 'cups_gss_printf()' - Show debug error messages from GSSAPI.
 602  */
 603
 604 static void
 605 cups_gss_printf(OM_uint32  major_status,/* I - Major status code */
 606                 OM_uint32  minor_status,/* I - Minor status code */
 607                 const char *message)    /* I - Prefix for error message */
 608 {
 609   OM_uint32     err_major_status,       /* Major status code for display */
 610                 err_minor_status;       /* Minor status code for display */
 611   OM_uint32     msg_ctx;                /* Message context */
 612   gss_buffer_desc major_status_string = GSS_C_EMPTY_BUFFER,
 613                                         /* Major status message */
 614                 minor_status_string = GSS_C_EMPTY_BUFFER;
 615                                         /* Minor status message */
 616
 617
 618   msg_ctx          = 0;
 619   err_major_status = gss_display_status(&err_minor_status,
 620                                         major_status,
 621                                         GSS_C_GSS_CODE,
 622                                         GSS_C_NO_OID,
 623                                         &msg_ctx,
 624                                         &major_status_string);
 625
 626   if (!GSS_ERROR(err_major_status))
 627     gss_display_status(&err_minor_status, minor_status, GSS_C_MECH_CODE,
 628                        GSS_C_NULL_OID, &msg_ctx, &minor_status_string);
 629
 630   DEBUG_printf(("1%s: %s, %s", message, (char *)major_status_string.value,
 631                 (char *)minor_status_string.value));
 632
 633   gss_release_buffer(&err_minor_status, &major_status_string);
 634   gss_release_buffer(&err_minor_status, &minor_status_string);
 635 }
 636 #  endif /* DEBUG */
 637 #endif /* HAVE_GSSAPI */
 638
 639
 640 /*
 641  * 'cups_local_auth()' - Get the local authorization certificate if
 642  *                       available/applicable.
 643  */
 644
 645 static int                              /* O - 0 if available */
 646                                         /*     1 if not available */
 647                                         /*    -1 error */
 648 cups_local_auth(http_t *http)           /* I - HTTP connection to server */
 649 {
 650 #if defined(WIN32) || defined(__EMX__)
 651  /*
 652   * Currently WIN32 and OS-2 do not support the CUPS server...
 653   */
 654
 655   return (1);
 656 #else
 657   int                   pid;            /* Current process ID */
 658   FILE                  *fp;            /* Certificate file */
 659   char                  trc[16],        /* Try Root Certificate parameter */
 660                         filename[1024], /* Certificate filename */
 661                         certificate[33];/* Certificate string */
 662   _cups_globals_t *cg = _cupsGlobals(); /* Global data */
 663 #  if defined(HAVE_AUTHORIZATION_H)
 664   OSStatus              status;         /* Status */
 665   AuthorizationItem     auth_right;     /* Authorization right */
 666   AuthorizationRights   auth_rights;    /* Authorization rights */
 667   AuthorizationFlags    auth_flags;     /* Authorization flags */
 668   AuthorizationExternalForm auth_extrn; /* Authorization ref external */
 669   char                  auth_key[1024]; /* Buffer */
 670   char                  buffer[1024];   /* Buffer */
 671 #  endif /* HAVE_AUTHORIZATION_H */
 672
 673
 674   DEBUG_printf(("7cups_local_auth(http=%p) hostaddr=%s, hostname=\"%s\"",
 675                 http, httpAddrString(http->hostaddr, filename, sizeof(filename)), http->hostname));
 676
 677  /*
 678   * See if we are accessing localhost...
 679   */
 680
 681   if (!httpAddrLocalhost(http->hostaddr) &&
 682       _cups_strcasecmp(http->hostname, "localhost") != 0)
 683   {
 684     DEBUG_puts("8cups_local_auth: Not a local connection!");
 685     return (1);
 686   }
 687
 688 #  if defined(HAVE_AUTHORIZATION_H)
 689  /*
 690   * Delete any previous authorization reference...
 691   */
 692
 693   if (http->auth_ref)
 694   {
 695     AuthorizationFree(http->auth_ref, kAuthorizationFlagDefaults);
 696     http->auth_ref = NULL;
 697   }
 698
 699   if (!getenv("GATEWAY_INTERFACE") &&
 700       httpGetSubField2(http, HTTP_FIELD_WWW_AUTHENTICATE, "authkey",
 701                        auth_key, sizeof(auth_key)))
 702   {
 703     status = AuthorizationCreate(NULL, kAuthorizationEmptyEnvironment,
 704                                  kAuthorizationFlagDefaults, &http->auth_ref);
 705     if (status != errAuthorizationSuccess)
 706     {
 707       DEBUG_printf(("8cups_local_auth: AuthorizationCreate() returned %d (%s)",
 708                     (int)status, cssmErrorString(status)));
 709       return (-1);
 710     }
 711
 712     auth_right.name        = auth_key;
 713     auth_right.valueLength = 0;
 714     auth_right.value       = NULL;
 715     auth_right.flags       = 0;
 716
 717     auth_rights.count = 1;
 718     auth_rights.items = &auth_right;
 719
 720     auth_flags = kAuthorizationFlagDefaults |
 721                  kAuthorizationFlagPreAuthorize |
 722                  kAuthorizationFlagInteractionAllowed |
 723                  kAuthorizationFlagExtendRights;
 724
 725     status = AuthorizationCopyRights(http->auth_ref, &auth_rights,
 726                                      kAuthorizationEmptyEnvironment,
 727                                      auth_flags, NULL);
 728     if (status == errAuthorizationSuccess)
 729       status = AuthorizationMakeExternalForm(http->auth_ref, &auth_extrn);
 730
 731     if (status == errAuthorizationSuccess)
 732     {
 733      /*
 734       * Set the authorization string and return...
 735       */
 736
 737       httpEncode64_2(buffer, sizeof(buffer), (void *)&auth_extrn,
 738                      sizeof(auth_extrn));
 739
 740       httpSetAuthString(http, "AuthRef", buffer);
 741
 742       DEBUG_printf(("8cups_local_auth: Returning authstring=\"%s\"",
 743                     http->authstring));
 744       return (0);
 745     }
 746     else if (status == errAuthorizationCanceled)
 747       return (-1);
 748
 749     DEBUG_printf(("9cups_local_auth: AuthorizationCopyRights() returned %d (%s)",
 750                   (int)status, cssmErrorString(status)));
 751
 752   /*
 753    * Fall through to try certificates...
 754    */
 755   }
 756 #  endif /* HAVE_AUTHORIZATION_H */
 757
 758 #  if defined(SO_PEERCRED) && defined(AF_LOCAL)
 759  /*
 760   * See if we can authenticate using the peer credentials provided over a
 761   * domain socket; if so, specify "PeerCred username" as the authentication
 762   * information...
 763   */
 764
 765   if (
 766 #    ifdef HAVE_GSSAPI
 767       strncmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Negotiate", 9) &&
 768 #    endif /* HAVE_GSSAPI */
 769 #    ifdef HAVE_AUTHORIZATION_H
 770       !httpGetSubField2(http, HTTP_FIELD_WWW_AUTHENTICATE, "authkey",
 771                         auth_key, sizeof(auth_key)) &&
 772 #    endif /* HAVE_AUTHORIZATION_H */
 773       http->hostaddr->addr.sa_family == AF_LOCAL &&
 774       !getenv("GATEWAY_INTERFACE"))     /* Not via CGI programs... */
 775   {
 776    /*
 777     * Verify that the current cupsUser() matches the current UID...
 778     */
 779
 780     struct passwd       *pwd;           /* Password information */
 781     const char          *username;      /* Current username */
 782
 783     username = cupsUser();
 784
 785     if ((pwd = getpwnam(username)) != NULL && pwd->pw_uid == getuid())
 786     {
 787       httpSetAuthString(http, "PeerCred", username);
 788
 789       DEBUG_printf(("8cups_local_auth: Returning authstring=\"%s\"",
 790                     http->authstring));
 791
 792       return (0);
 793     }
 794   }
 795 #  endif /* SO_PEERCRED && AF_LOCAL */
 796
 797  /*
 798   * Try opening a certificate file for this PID.  If that fails,
 799   * try the root certificate...
 800   */
 801
 802   pid = getpid();
 803   snprintf(filename, sizeof(filename), "%s/certs/%d", cg->cups_statedir, pid);
 804   if ((fp = fopen(filename, "r")) == NULL && pid > 0)
 805   {
 806    /*
 807     * No certificate for this PID; see if we can get the root certificate...
 808     */
 809
 810     DEBUG_printf(("9cups_local_auth: Unable to open file %s: %s",
 811                   filename, strerror(errno)));
 812
 813 #  ifdef HAVE_GSSAPI
 814     if (!strncmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Negotiate", 9))
 815     {
 816      /*
 817       * Kerberos required, don't try the root certificate...
 818       */
 819
 820       return (1);
 821     }
 822 #  endif /* HAVE_GSSAPI */
 823
 824 #  ifdef HAVE_AUTHORIZATION_H
 825     if (httpGetSubField2(http, HTTP_FIELD_WWW_AUTHENTICATE, "authkey",
 826                          auth_key, sizeof(auth_key)))
 827     {
 828      /*
 829       * Don't use the root certificate as a replacement for an authkey...
 830       */
 831
 832       return (1);
 833     }
 834 #  endif /* HAVE_AUTHORIZATION_H */
 835     if (!httpGetSubField2(http, HTTP_FIELD_WWW_AUTHENTICATE, "trc", trc,
 836                           sizeof(trc)))
 837     {
 838      /*
 839       * Scheduler doesn't want us to use the root certificate...
 840       */
 841
 842       return (1);
 843     }
 844
 845     snprintf(filename, sizeof(filename), "%s/certs/0", cg->cups_statedir);
 846     fp = fopen(filename, "r");
 847   }
 848
 849   if (fp)
 850   {
 851    /*
 852     * Read the certificate from the file...
 853     */
 854
 855     fgets(certificate, sizeof(certificate), fp);
 856     fclose(fp);
 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   return (1);
 871 #endif /* WIN32 || __EMX__ */
 872 }
 873
 874
 875 /*
 876  * End of "$Id: auth.c 7720 2008-07-11 22:46:21Z mike $".
 877  */