cups/auth.c

   1 /*
   2  * Authentication functions for CUPS.
   3  *
   4  * Copyright 2007-2014 by Apple Inc.
   5  * Copyright 1997-2007 by Easy Software Products.
   6  *
   7  * This file contains Kerberos support code, copyright 2006 by
   8  * Jelmer Vernooij.
   9  *
  10  * These coded instructions, statements, and computer programs are the
  11  * property of Apple Inc. and are protected by Federal copyright
  12  * law.  Distribution and use rights are outlined in the file "LICENSE.txt"
  13  * which should have been included with this file.  If this file is
  14  * file is missing or damaged, see the license at "http://www.cups.org/".
  15  *
  16  * This file is subject to the Apple OS-Developed Software exception.
  17  */
  18
  19 /*
  20  * Include necessary headers...
  21  */
  22
  23 #include "cups-private.h"
  24 #include <fcntl.h>
  25 #include <sys/stat.h>
  26 #if defined(WIN32) || defined(__EMX__)
  27 #  include <io.h>
  28 #else
  29 #  include <unistd.h>
  30 #endif /* WIN32 || __EMX__ */
  31
  32 #if HAVE_AUTHORIZATION_H
  33 #  include <Security/Authorization.h>
  34 #  ifdef HAVE_SECBASEPRIV_H
  35 #    include <Security/SecBasePriv.h>
  36 #  else
  37 extern const char *cssmErrorString(int error);
  38 #  endif /* HAVE_SECBASEPRIV_H */
  39 #endif /* HAVE_AUTHORIZATION_H */
  40
  41 #if defined(SO_PEERCRED) && defined(AF_LOCAL)
  42 #  include <pwd.h>
  43 #endif /* SO_PEERCRED && AF_LOCAL */
  44
  45
  46 /*
  47  * Local functions...
  48  */
  49
  50 #ifdef HAVE_GSSAPI
  51 #  ifdef HAVE_GSS_ACQUIRE_CRED_EX_F
  52 #    ifdef HAVE_GSS_GSSAPI_SPI_H
  53 #      include <GSS/gssapi_spi.h>
  54 #    else
  55 #      define GSS_AUTH_IDENTITY_TYPE_1 1
  56 #      define gss_acquire_cred_ex_f __ApplePrivate_gss_acquire_cred_ex_f
  57 typedef struct gss_auth_identity
  58 {
  59   uint32_t type;
  60   uint32_t flags;
  61   char *username;
  62   char *realm;
  63   char *password;
  64   gss_buffer_t *credentialsRef;
  65 } gss_auth_identity_desc;
  66 extern OM_uint32 gss_acquire_cred_ex_f(gss_status_id_t, const gss_name_t,
  67                                        OM_uint32, OM_uint32, const gss_OID,
  68                                        gss_cred_usage_t, gss_auth_identity_t,
  69                                        void *, void (*)(void *, OM_uint32,
  70                                                         gss_status_id_t,
  71                                                         gss_cred_id_t,
  72                                                         gss_OID_set,
  73                                                         OM_uint32));
  74 #    endif /* HAVE_GSS_GSSAPI_SPI_H */
  75 #    include <dispatch/dispatch.h>
  76 typedef struct _cups_gss_acquire_s      /* Acquire callback data */
  77 {
  78   dispatch_semaphore_t  sem;            /* Synchronization semaphore */
  79   OM_uint32             major;          /* Returned status code */
  80   gss_cred_id_t         creds;          /* Returned credentials */
  81 } _cups_gss_acquire_t;
  82
  83 static void     cups_gss_acquire(void *ctx, OM_uint32 major,
  84                                  gss_status_id_t status,
  85                                  gss_cred_id_t creds, gss_OID_set oids,
  86                                  OM_uint32 time_rec);
  87 #  endif /* HAVE_GSS_ACQUIRE_CRED_EX_F */
  88 static gss_name_t cups_gss_getname(http_t *http, const char *service_name);
  89 #  ifdef DEBUG
  90 static void     cups_gss_printf(OM_uint32 major_status, OM_uint32 minor_status,
  91                                 const char *message);
  92 #  else
  93 #    define     cups_gss_printf(major, minor, message)
  94 #  endif /* DEBUG */
  95 #endif /* HAVE_GSSAPI */
  96 static int      cups_local_auth(http_t *http);
  97
  98
  99 /*
 100  * 'cupsDoAuthentication()' - Authenticate a request.
 101  *
 102  * This function should be called in response to a @code HTTP_STATUS_UNAUTHORIZED@
 103  * status, prior to resubmitting your request.
 104  *
 105  * @since CUPS 1.1.20/OS X 10.4@
 106  */
 107
 108 int                                     /* O - 0 on success, -1 on error */
 109 cupsDoAuthentication(
 110     http_t     *http,                   /* I - Connection to server or @code CUPS_HTTP_DEFAULT@ */
 111     const char *method,                 /* I - Request method ("GET", "POST", "PUT") */
 112     const char *resource)               /* I - Resource path */
 113 {
 114   const char    *password,              /* Password string */
 115                 *www_auth;              /* WWW-Authenticate header */
 116   char          prompt[1024],           /* Prompt for user */
 117                 realm[HTTP_MAX_VALUE],  /* realm="xyz" string */
 118                 nonce[HTTP_MAX_VALUE];  /* nonce="xyz" string */
 119   int           localauth;              /* Local authentication result */
 120   _cups_globals_t *cg;                  /* Global data */
 121
 122
 123   DEBUG_printf(("cupsDoAuthentication(http=%p, method=\"%s\", resource=\"%s\")", (void *)http, method, resource));
 124
 125   if (!http)
 126     http = _cupsConnect();
 127
 128   if (!http || !method || !resource)
 129     return (-1);
 130
 131   DEBUG_printf(("2cupsDoAuthentication: digest_tries=%d, userpass=\"%s\"",
 132                 http->digest_tries, http->userpass));
 133   DEBUG_printf(("2cupsDoAuthentication: WWW-Authenticate=\"%s\"",
 134                 httpGetField(http, HTTP_FIELD_WWW_AUTHENTICATE)));
 135
 136  /*
 137   * Clear the current authentication string...
 138   */
 139
 140   httpSetAuthString(http, NULL, NULL);
 141
 142  /*
 143   * See if we can do local authentication...
 144   */
 145
 146   if (http->digest_tries < 3)
 147   {
 148     if ((localauth = cups_local_auth(http)) == 0)
 149     {
 150       DEBUG_printf(("2cupsDoAuthentication: authstring=\"%s\"",
 151                     http->authstring));
 152
 153       if (http->status == HTTP_STATUS_UNAUTHORIZED)
 154         http->digest_tries ++;
 155
 156       return (0);
 157     }
 158     else if (localauth == -1)
 159     {
 160       http->status = HTTP_STATUS_CUPS_AUTHORIZATION_CANCELED;
 161       return (-1);                      /* Error or canceled */
 162     }
 163   }
 164
 165  /*
 166   * Nope, see if we should retry the current username:password...
 167   */
 168
 169   www_auth = http->fields[HTTP_FIELD_WWW_AUTHENTICATE];
 170
 171   if ((http->digest_tries > 1 || !http->userpass[0]) &&
 172       (!_cups_strncasecmp(www_auth, "Basic", 5) ||
 173        !_cups_strncasecmp(www_auth, "Digest", 6)))
 174   {
 175    /*
 176     * Nope - get a new password from the user...
 177     */
 178
 179     char default_username[HTTP_MAX_VALUE];
 180                                         /* Default username */
 181
 182     cg = _cupsGlobals();
 183
 184     if (!cg->lang_default)
 185       cg->lang_default = cupsLangDefault();
 186
 187     if (httpGetSubField(http, HTTP_FIELD_WWW_AUTHENTICATE, "username",
 188                         default_username))
 189       cupsSetUser(default_username);
 190
 191     snprintf(prompt, sizeof(prompt),
 192              _cupsLangString(cg->lang_default, _("Password for %s on %s? ")),
 193              cupsUser(),
 194              http->hostname[0] == '/' ? "localhost" : http->hostname);
 195
 196     http->digest_tries  = _cups_strncasecmp(www_auth, "Digest", 6) != 0;
 197     http->userpass[0]   = '\0';
 198
 199     if ((password = cupsGetPassword2(prompt, http, method, resource)) == NULL)
 200     {
 201       http->status = HTTP_STATUS_CUPS_AUTHORIZATION_CANCELED;
 202       return (-1);
 203     }
 204
 205     snprintf(http->userpass, sizeof(http->userpass), "%s:%s", cupsUser(),
 206              password);
 207   }
 208   else if (http->status == HTTP_STATUS_UNAUTHORIZED)
 209     http->digest_tries ++;
 210
 211   if (http->status == HTTP_STATUS_UNAUTHORIZED && http->digest_tries >= 3)
 212   {
 213     DEBUG_printf(("1cupsDoAuthentication: Too many authentication tries (%d)",
 214                   http->digest_tries));
 215
 216     http->status = HTTP_STATUS_CUPS_AUTHORIZATION_CANCELED;
 217     return (-1);
 218   }
 219
 220  /*
 221   * Got a password; encode it for the server...
 222   */
 223
 224 #ifdef HAVE_GSSAPI
 225   if (!_cups_strncasecmp(www_auth, "Negotiate", 9))
 226   {
 227    /*
 228     * Kerberos authentication...
 229     */
 230
 231     if (_cupsSetNegotiateAuthString(http, method, resource))
 232     {
 233       http->status = HTTP_STATUS_CUPS_AUTHORIZATION_CANCELED;
 234       return (-1);
 235     }
 236   }
 237   else
 238 #endif /* HAVE_GSSAPI */
 239   if (!_cups_strncasecmp(www_auth, "Basic", 5))
 240   {
 241    /*
 242     * Basic authentication...
 243     */
 244
 245     char        encode[256];            /* Base64 buffer */
 246
 247
 248     httpEncode64_2(encode, sizeof(encode), http->userpass,
 249                    (int)strlen(http->userpass));
 250     httpSetAuthString(http, "Basic", encode);
 251   }
 252   else if (!_cups_strncasecmp(www_auth, "Digest", 6))
 253   {
 254    /*
 255     * Digest authentication...
 256     */
 257
 258     char        encode[33],             /* MD5 buffer */
 259                 digest[1024];           /* Digest auth data */
 260
 261     httpGetSubField(http, HTTP_FIELD_WWW_AUTHENTICATE, "realm", realm);
 262     httpGetSubField(http, HTTP_FIELD_WWW_AUTHENTICATE, "nonce", nonce);
 263
 264     httpMD5(cupsUser(), realm, strchr(http->userpass, ':') + 1, encode);
 265     httpMD5Final(nonce, method, resource, encode);
 266     snprintf(digest, sizeof(digest),
 267              "username=\"%s\", realm=\"%s\", nonce=\"%s\", uri=\"%s\", "
 268              "response=\"%s\"", cupsUser(), realm, nonce, resource, encode);
 269     httpSetAuthString(http, "Digest", digest);
 270   }
 271   else
 272   {
 273     DEBUG_printf(("1cupsDoAuthentication: Unknown auth type: \"%s\"",
 274                   www_auth));
 275     http->status = HTTP_STATUS_CUPS_AUTHORIZATION_CANCELED;
 276     return (-1);
 277   }
 278
 279   DEBUG_printf(("1cupsDoAuthentication: authstring=\"%s\"", http->authstring));
 280
 281   return (0);
 282 }
 283
 284
 285 #ifdef HAVE_GSSAPI
 286 /*
 287  * '_cupsSetNegotiateAuthString()' - Set the Kerberos authentication string.
 288  */
 289
 290 int                                     /* O - 0 on success, -1 on error */
 291 _cupsSetNegotiateAuthString(
 292     http_t     *http,                   /* I - Connection to server */
 293     const char *method,                 /* I - Request method ("GET", "POST", "PUT") */
 294     const char *resource)               /* I - Resource path */
 295 {
 296   OM_uint32     minor_status,           /* Minor status code */
 297                 major_status;           /* Major status code */
 298   gss_buffer_desc output_token = GSS_C_EMPTY_BUFFER;
 299                                         /* Output token */
 300
 301
 302   (void)method;
 303   (void)resource;
 304
 305 #  ifdef __APPLE__
 306  /*
 307   * If the weak-linked GSSAPI/Kerberos library is not present, don't try
 308   * to use it...
 309   */
 310
 311   if (&gss_init_sec_context == NULL)
 312   {
 313     DEBUG_puts("1_cupsSetNegotiateAuthString: Weak-linked GSSAPI/Kerberos "
 314                "framework is not present");
 315     return (-1);
 316   }
 317 #  endif /* __APPLE__ */
 318
 319   if (http->gssname == GSS_C_NO_NAME)
 320   {
 321     http->gssname = cups_gss_getname(http, _cupsGSSServiceName());
 322   }
 323
 324   if (http->gssctx != GSS_C_NO_CONTEXT)
 325   {
 326     gss_delete_sec_context(&minor_status, &http->gssctx, GSS_C_NO_BUFFER);
 327     http->gssctx = GSS_C_NO_CONTEXT;
 328   }
 329
 330   major_status = gss_init_sec_context(&minor_status, GSS_C_NO_CREDENTIAL,
 331                                       &http->gssctx,
 332                                       http->gssname, http->gssmech,
 333                                       GSS_C_MUTUAL_FLAG | GSS_C_INTEG_FLAG,
 334                                       GSS_C_INDEFINITE,
 335                                       GSS_C_NO_CHANNEL_BINDINGS,
 336                                       GSS_C_NO_BUFFER, &http->gssmech,
 337                                       &output_token, NULL, NULL);
 338
 339 #ifdef HAVE_GSS_ACQUIRE_CRED_EX_F
 340   if (major_status == GSS_S_NO_CRED)
 341   {
 342    /*
 343     * Ask the user for credentials...
 344     */
 345
 346     char                prompt[1024],   /* Prompt for user */
 347                         userbuf[256];   /* Kerberos username */
 348     const char          *username,      /* Username string */
 349                         *password;      /* Password string */
 350     _cups_gss_acquire_t data;           /* Callback data */
 351     gss_auth_identity_desc identity;    /* Kerberos user identity */
 352     _cups_globals_t     *cg = _cupsGlobals();
 353                                         /* Per-thread global data */
 354
 355     if (!cg->lang_default)
 356       cg->lang_default = cupsLangDefault();
 357
 358     snprintf(prompt, sizeof(prompt),
 359              _cupsLangString(cg->lang_default, _("Password for %s on %s? ")),
 360              cupsUser(), http->gsshost);
 361
 362     if ((password = cupsGetPassword2(prompt, http, method, resource)) == NULL)
 363       return (-1);
 364
 365    /*
 366     * Try to acquire credentials...
 367     */
 368
 369     username = cupsUser();
 370     if (!strchr(username, '@'))
 371     {
 372       snprintf(userbuf, sizeof(userbuf), "%s@%s", username, http->gsshost);
 373       username = userbuf;
 374     }
 375
 376     identity.type           = GSS_AUTH_IDENTITY_TYPE_1;
 377     identity.flags          = 0;
 378     identity.username       = (char *)username;
 379     identity.realm          = (char *)"";
 380     identity.password       = (char *)password;
 381     identity.credentialsRef = NULL;
 382
 383     data.sem   = dispatch_semaphore_create(0);
 384     data.major = 0;
 385     data.creds = NULL;
 386
 387     if (data.sem)
 388     {
 389       major_status = gss_acquire_cred_ex_f(NULL, GSS_C_NO_NAME, 0,
 390                                            GSS_C_INDEFINITE, GSS_KRB5_MECHANISM,
 391                                            GSS_C_INITIATE, &identity, &data,
 392                                            cups_gss_acquire);
 393
 394       if (major_status == GSS_S_COMPLETE)
 395       {
 396         dispatch_semaphore_wait(data.sem, DISPATCH_TIME_FOREVER);
 397         major_status = data.major;
 398       }
 399
 400       dispatch_release(data.sem);
 401
 402       if (major_status == GSS_S_COMPLETE)
 403       {
 404         OM_uint32       release_minor;  /* Minor status from releasing creds */
 405
 406         major_status = gss_init_sec_context(&minor_status, data.creds,
 407                                             &http->gssctx,
 408                                             http->gssname, http->gssmech,
 409                                             GSS_C_MUTUAL_FLAG | GSS_C_INTEG_FLAG,
 410                                             GSS_C_INDEFINITE,
 411                                             GSS_C_NO_CHANNEL_BINDINGS,
 412                                             GSS_C_NO_BUFFER, &http->gssmech,
 413                                             &output_token, NULL, NULL);
 414         gss_release_cred(&release_minor, &data.creds);
 415       }
 416     }
 417   }
 418 #endif /* HAVE_GSS_ACQUIRED_CRED_EX_F */
 419
 420   if (GSS_ERROR(major_status))
 421   {
 422     cups_gss_printf(major_status, minor_status,
 423                     "_cupsSetNegotiateAuthString: Unable to initialize "
 424                     "security context");
 425     return (-1);
 426   }
 427
 428 #ifdef DEBUG
 429   else if (major_status == GSS_S_CONTINUE_NEEDED)
 430     cups_gss_printf(major_status, minor_status,
 431                     "_cupsSetNegotiateAuthString: Continuation needed!");
 432 #endif /* DEBUG */
 433
 434   if (output_token.length > 0 && output_token.length <= 65536)
 435   {
 436    /*
 437     * Allocate the authorization string since Windows KDCs can have
 438     * arbitrarily large credentials...
 439     */
 440
 441     int authsize = 10 +                 /* "Negotiate " */
 442                    (int)output_token.length * 4 / 3 + 1 + 1;
 443                                         /* Base64 + nul */
 444
 445     httpSetAuthString(http, NULL, NULL);
 446
 447     if ((http->authstring = malloc((size_t)authsize)) == NULL)
 448     {
 449       http->authstring = http->_authstring;
 450       authsize         = sizeof(http->_authstring);
 451     }
 452
 453     strlcpy(http->authstring, "Negotiate ", (size_t)authsize);
 454     httpEncode64_2(http->authstring + 10, authsize - 10, output_token.value,
 455                    (int)output_token.length);
 456
 457     gss_release_buffer(&minor_status, &output_token);
 458   }
 459   else
 460   {
 461     DEBUG_printf(("1_cupsSetNegotiateAuthString: Kerberos credentials too "
 462                   "large - %d bytes!", (int)output_token.length));
 463     gss_release_buffer(&minor_status, &output_token);
 464
 465     return (-1);
 466   }
 467
 468   return (0);
 469 }
 470
 471
 472 #  ifdef HAVE_GSS_ACQUIRE_CRED_EX_F
 473 /*
 474  * 'cups_gss_acquire()' - Kerberos credentials callback.
 475  */
 476 static void
 477 cups_gss_acquire(
 478     void            *ctx,               /* I - Caller context */
 479     OM_uint32       major,              /* I - Major error code */
 480     gss_status_id_t status,             /* I - Status (unused) */
 481     gss_cred_id_t   creds,              /* I - Credentials (if any) */
 482     gss_OID_set     oids,               /* I - Mechanism OIDs (unused) */
 483     OM_uint32       time_rec)           /* I - Timestamp (unused) */
 484 {
 485   uint32_t              min;            /* Minor error code */
 486   _cups_gss_acquire_t   *data;          /* Callback data */
 487
 488
 489   (void)status;
 490   (void)time_rec;
 491
 492   data        = (_cups_gss_acquire_t *)ctx;
 493   data->major = major;
 494   data->creds = creds;
 495
 496   gss_release_oid_set(&min, &oids);
 497   dispatch_semaphore_signal(data->sem);
 498 }
 499 #  endif /* HAVE_GSS_ACQUIRE_CRED_EX_F */
 500
 501
 502 /*
 503  * 'cups_gss_getname()' - Get CUPS service credentials for authentication.
 504  */
 505
 506 static gss_name_t                       /* O - Server name */
 507 cups_gss_getname(
 508     http_t     *http,                   /* I - Connection to server */
 509     const char *service_name)           /* I - Service name */
 510 {
 511   gss_buffer_desc token = GSS_C_EMPTY_BUFFER;
 512                                         /* Service token */
 513   OM_uint32       major_status,         /* Major status code */
 514                   minor_status;         /* Minor status code */
 515   gss_name_t      server_name;          /* Server name */
 516   char            buf[1024];            /* Name buffer */
 517
 518
 519   DEBUG_printf(("7cups_gss_getname(http=%p, service_name=\"%s\")", http,
 520                 service_name));
 521
 522
 523  /*
 524   * Get the hostname...
 525   */
 526
 527   if (!http->gsshost[0])
 528   {
 529     httpGetHostname(http, http->gsshost, sizeof(http->gsshost));
 530
 531     if (!strcmp(http->gsshost, "localhost"))
 532     {
 533       if (gethostname(http->gsshost, sizeof(http->gsshost)) < 0)
 534       {
 535         DEBUG_printf(("1cups_gss_getname: gethostname() failed: %s",
 536                       strerror(errno)));
 537         http->gsshost[0] = '\0';
 538         return (NULL);
 539       }
 540
 541       if (!strchr(http->gsshost, '.'))
 542       {
 543        /*
 544         * The hostname is not a FQDN, so look it up...
 545         */
 546
 547         struct hostent  *host;          /* Host entry to get FQDN */
 548
 549         if ((host = gethostbyname(http->gsshost)) != NULL && host->h_name)
 550         {
 551          /*
 552           * Use the resolved hostname...
 553           */
 554
 555           strlcpy(http->gsshost, host->h_name, sizeof(http->gsshost));
 556         }
 557         else
 558         {
 559           DEBUG_printf(("1cups_gss_getname: gethostbyname(\"%s\") failed.",
 560                         http->gsshost));
 561           http->gsshost[0] = '\0';
 562           return (NULL);
 563         }
 564       }
 565     }
 566   }
 567
 568  /*
 569   * Get a service name we can use for authentication purposes...
 570   */
 571
 572   snprintf(buf, sizeof(buf), "%s@%s", service_name, http->gsshost);
 573
 574   DEBUG_printf(("8cups_gss_getname: Looking up \"%s\".", buf));
 575
 576   token.value  = buf;
 577   token.length = strlen(buf);
 578   server_name  = GSS_C_NO_NAME;
 579   major_status = gss_import_name(&minor_status, &token,
 580                                  GSS_C_NT_HOSTBASED_SERVICE,
 581                                  &server_name);
 582
 583   if (GSS_ERROR(major_status))
 584   {
 585     cups_gss_printf(major_status, minor_status,
 586                     "cups_gss_getname: gss_import_name() failed");
 587     return (NULL);
 588   }
 589
 590   return (server_name);
 591 }
 592
 593
 594 #  ifdef DEBUG
 595 /*
 596  * 'cups_gss_printf()' - Show debug error messages from GSSAPI.
 597  */
 598
 599 static void
 600 cups_gss_printf(OM_uint32  major_status,/* I - Major status code */
 601                 OM_uint32  minor_status,/* I - Minor status code */
 602                 const char *message)    /* I - Prefix for error message */
 603 {
 604   OM_uint32     err_major_status,       /* Major status code for display */
 605                 err_minor_status;       /* Minor status code for display */
 606   OM_uint32     msg_ctx;                /* Message context */
 607   gss_buffer_desc major_status_string = GSS_C_EMPTY_BUFFER,
 608                                         /* Major status message */
 609                 minor_status_string = GSS_C_EMPTY_BUFFER;
 610                                         /* Minor status message */
 611
 612
 613   msg_ctx          = 0;
 614   err_major_status = gss_display_status(&err_minor_status,
 615                                         major_status,
 616                                         GSS_C_GSS_CODE,
 617                                         GSS_C_NO_OID,
 618                                         &msg_ctx,
 619                                         &major_status_string);
 620
 621   if (!GSS_ERROR(err_major_status))
 622     gss_display_status(&err_minor_status, minor_status, GSS_C_MECH_CODE,
 623                        GSS_C_NULL_OID, &msg_ctx, &minor_status_string);
 624
 625   DEBUG_printf(("1%s: %s, %s", message, (char *)major_status_string.value,
 626                 (char *)minor_status_string.value));
 627
 628   gss_release_buffer(&err_minor_status, &major_status_string);
 629   gss_release_buffer(&err_minor_status, &minor_status_string);
 630 }
 631 #  endif /* DEBUG */
 632 #endif /* HAVE_GSSAPI */
 633
 634
 635 /*
 636  * 'cups_local_auth()' - Get the local authorization certificate if
 637  *                       available/applicable.
 638  */
 639
 640 static int                              /* O - 0 if available */
 641                                         /*     1 if not available */
 642                                         /*    -1 error */
 643 cups_local_auth(http_t *http)           /* I - HTTP connection to server */
 644 {
 645 #if defined(WIN32) || defined(__EMX__)
 646  /*
 647   * Currently WIN32 and OS-2 do not support the CUPS server...
 648   */
 649
 650   return (1);
 651 #else
 652   int                   pid;            /* Current process ID */
 653   FILE                  *fp;            /* Certificate file */
 654   char                  trc[16],        /* Try Root Certificate parameter */
 655                         filename[1024]; /* Certificate filename */
 656   _cups_globals_t *cg = _cupsGlobals(); /* Global data */
 657 #  if defined(HAVE_AUTHORIZATION_H)
 658   OSStatus              status;         /* Status */
 659   AuthorizationItem     auth_right;     /* Authorization right */
 660   AuthorizationRights   auth_rights;    /* Authorization rights */
 661   AuthorizationFlags    auth_flags;     /* Authorization flags */
 662   AuthorizationExternalForm auth_extrn; /* Authorization ref external */
 663   char                  auth_key[1024]; /* Buffer */
 664   char                  buffer[1024];   /* Buffer */
 665 #  endif /* HAVE_AUTHORIZATION_H */
 666
 667
 668   DEBUG_printf(("7cups_local_auth(http=%p) hostaddr=%s, hostname=\"%s\"", (void *)http, httpAddrString(http->hostaddr, filename, sizeof(filename)), http->hostname));
 669
 670  /*
 671   * See if we are accessing localhost...
 672   */
 673
 674   if (!httpAddrLocalhost(http->hostaddr) &&
 675       _cups_strcasecmp(http->hostname, "localhost") != 0)
 676   {
 677     DEBUG_puts("8cups_local_auth: Not a local connection!");
 678     return (1);
 679   }
 680
 681 #  if defined(HAVE_AUTHORIZATION_H)
 682  /*
 683   * Delete any previous authorization reference...
 684   */
 685
 686   if (http->auth_ref)
 687   {
 688     AuthorizationFree(http->auth_ref, kAuthorizationFlagDefaults);
 689     http->auth_ref = NULL;
 690   }
 691
 692   if (!getenv("GATEWAY_INTERFACE") &&
 693       httpGetSubField2(http, HTTP_FIELD_WWW_AUTHENTICATE, "authkey",
 694                        auth_key, sizeof(auth_key)))
 695   {
 696     status = AuthorizationCreate(NULL, kAuthorizationEmptyEnvironment,
 697                                  kAuthorizationFlagDefaults, &http->auth_ref);
 698     if (status != errAuthorizationSuccess)
 699     {
 700       DEBUG_printf(("8cups_local_auth: AuthorizationCreate() returned %d (%s)",
 701                     (int)status, cssmErrorString(status)));
 702       return (-1);
 703     }
 704
 705     auth_right.name        = auth_key;
 706     auth_right.valueLength = 0;
 707     auth_right.value       = NULL;
 708     auth_right.flags       = 0;
 709
 710     auth_rights.count = 1;
 711     auth_rights.items = &auth_right;
 712
 713     auth_flags = kAuthorizationFlagDefaults |
 714                  kAuthorizationFlagPreAuthorize |
 715                  kAuthorizationFlagInteractionAllowed |
 716                  kAuthorizationFlagExtendRights;
 717
 718     status = AuthorizationCopyRights(http->auth_ref, &auth_rights,
 719                                      kAuthorizationEmptyEnvironment,
 720                                      auth_flags, NULL);
 721     if (status == errAuthorizationSuccess)
 722       status = AuthorizationMakeExternalForm(http->auth_ref, &auth_extrn);
 723
 724     if (status == errAuthorizationSuccess)
 725     {
 726      /*
 727       * Set the authorization string and return...
 728       */
 729
 730       httpEncode64_2(buffer, sizeof(buffer), (void *)&auth_extrn,
 731                      sizeof(auth_extrn));
 732
 733       httpSetAuthString(http, "AuthRef", buffer);
 734
 735       DEBUG_printf(("8cups_local_auth: Returning authstring=\"%s\"",
 736                     http->authstring));
 737       return (0);
 738     }
 739     else if (status == errAuthorizationCanceled)
 740       return (-1);
 741
 742     DEBUG_printf(("9cups_local_auth: AuthorizationCopyRights() returned %d (%s)",
 743                   (int)status, cssmErrorString(status)));
 744
 745   /*
 746    * Fall through to try certificates...
 747    */
 748   }
 749 #  endif /* HAVE_AUTHORIZATION_H */
 750
 751 #  if defined(SO_PEERCRED) && defined(AF_LOCAL)
 752  /*
 753   * See if we can authenticate using the peer credentials provided over a
 754   * domain socket; if so, specify "PeerCred username" as the authentication
 755   * information...
 756   */
 757
 758   if (
 759 #    ifdef HAVE_GSSAPI
 760       _cups_strncasecmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Negotiate", 9) &&
 761 #    endif /* HAVE_GSSAPI */
 762 #    ifdef HAVE_AUTHORIZATION_H
 763       !httpGetSubField2(http, HTTP_FIELD_WWW_AUTHENTICATE, "authkey",
 764                         auth_key, sizeof(auth_key)) &&
 765 #    endif /* HAVE_AUTHORIZATION_H */
 766       http->hostaddr->addr.sa_family == AF_LOCAL &&
 767       !getenv("GATEWAY_INTERFACE"))     /* Not via CGI programs... */
 768   {
 769    /*
 770     * Verify that the current cupsUser() matches the current UID...
 771     */
 772
 773     struct passwd       *pwd;           /* Password information */
 774     const char          *username;      /* Current username */
 775
 776     username = cupsUser();
 777
 778     if ((pwd = getpwnam(username)) != NULL && pwd->pw_uid == getuid())
 779     {
 780       httpSetAuthString(http, "PeerCred", username);
 781
 782       DEBUG_printf(("8cups_local_auth: Returning authstring=\"%s\"",
 783                     http->authstring));
 784
 785       return (0);
 786     }
 787   }
 788 #  endif /* SO_PEERCRED && AF_LOCAL */
 789
 790  /*
 791   * Try opening a certificate file for this PID.  If that fails,
 792   * try the root certificate...
 793   */
 794
 795   pid = getpid();
 796   snprintf(filename, sizeof(filename), "%s/certs/%d", cg->cups_statedir, pid);
 797   if ((fp = fopen(filename, "r")) == NULL && pid > 0)
 798   {
 799    /*
 800     * No certificate for this PID; see if we can get the root certificate...
 801     */
 802
 803     DEBUG_printf(("9cups_local_auth: Unable to open file %s: %s",
 804                   filename, strerror(errno)));
 805
 806 #  ifdef HAVE_GSSAPI
 807     if (!_cups_strncasecmp(http->fields[HTTP_FIELD_WWW_AUTHENTICATE], "Negotiate", 9))
 808     {
 809      /*
 810       * Kerberos required, don't try the root certificate...
 811       */
 812
 813       return (1);
 814     }
 815 #  endif /* HAVE_GSSAPI */
 816
 817 #  ifdef HAVE_AUTHORIZATION_H
 818     if (httpGetSubField2(http, HTTP_FIELD_WWW_AUTHENTICATE, "authkey",
 819                          auth_key, sizeof(auth_key)))
 820     {
 821      /*
 822       * Don't use the root certificate as a replacement for an authkey...
 823       */
 824
 825       return (1);
 826     }
 827 #  endif /* HAVE_AUTHORIZATION_H */
 828     if (!httpGetSubField2(http, HTTP_FIELD_WWW_AUTHENTICATE, "trc", trc,
 829                           sizeof(trc)))
 830     {
 831      /*
 832       * Scheduler doesn't want us to use the root certificate...
 833       */
 834
 835       return (1);
 836     }
 837
 838     snprintf(filename, sizeof(filename), "%s/certs/0", cg->cups_statedir);
 839     fp = fopen(filename, "r");
 840   }
 841
 842   if (fp)
 843   {
 844    /*
 845     * Read the certificate from the file...
 846     */
 847
 848     char        certificate[33],        /* Certificate string */
 849                 *certptr;               /* Pointer to certificate string */
 850
 851     certptr = fgets(certificate, sizeof(certificate), fp);
 852     fclose(fp);
 853
 854     if (certptr)
 855     {
 856      /*
 857       * Set the authorization string and return...
 858       */
 859
 860       httpSetAuthString(http, "Local", certificate);
 861
 862       DEBUG_printf(("8cups_local_auth: Returning authstring=\"%s\"",
 863                     http->authstring));
 864
 865       return (0);
 866     }
 867   }
 868
 869   return (1);
 870 #endif /* WIN32 || __EMX__ */
 871 }