source/client/smbspool.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    SMB backend for the Common UNIX Printing System ("CUPS")
   4    Copyright 1999 by Easy Software Products
   5    Copyright Andrew Tridgell 1994-1998
   6    Copyright Andrew Bartlett 2002
   7    Copyright Rodrigo Fernandez-Vizarra 2005
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 */
  23
  24 #include "includes.h"
  25
  26 #define TICKET_CC_DIR            "/tmp"
  27 #define CC_PREFIX                "krb5cc_" /* prefix of the ticket cache */
  28 #define CC_MAX_FILE_LEN          24
  29 #define CC_MAX_FILE_PATH_LEN     (sizeof(TICKET_CC_DIR)-1)+ CC_MAX_FILE_LEN+2
  30 #define OVERWRITE                1
  31 #define KRB5CCNAME               "KRB5CCNAME"
  32 #define MAX_RETRY_CONNECT        3
  33
  34
  35 /*
  36  * Globals...
  37  */
  38
  39 extern BOOL             in_client;      /* Boolean for client library */
  40
  41
  42 /*
  43  * Local functions...
  44  */
  45
  46 static void             list_devices(void);
  47 static struct cli_state *smb_complete_connection(const char *, const char *,int , const char *, const char *, const char *, const char *, int);
  48 static struct cli_state *smb_connect(const char *, const char *, int, const char *, const char *, const char *, const char *);
  49 static int              smb_print(struct cli_state *, char *, FILE *);
  50
  51
  52 /*
  53  * 'main()' - Main entry for SMB backend.
  54  */
  55
  56  int                            /* O - Exit status */
  57  main(int  argc,                        /* I - Number of command-line arguments */
  58      char *argv[])              /* I - Command-line arguments */
  59 {
  60   int           i;              /* Looping var */
  61   int           copies;         /* Number of copies */
  62   int           port;           /* Port number */
  63   char          uri[1024],      /* URI */
  64                 *sep,           /* Pointer to separator */
  65                 *password;      /* Password */
  66   const char    *username,      /* Username */
  67                 *server,        /* Server name */
  68                 *printer;       /* Printer name */
  69   const char    *workgroup;     /* Workgroup */
  70   FILE          *fp;            /* File to print */
  71   int           status=0;               /* Status of LPD job */
  72   struct cli_state *cli;        /* SMB interface */
  73   char null_str[1];
  74   int tries = 0;
  75
  76   null_str[0] = '\0';
  77
  78   /* we expect the URI in argv[0]. Detect the case where it is in argv[1] and cope */
  79   if (argc > 2 && strncmp(argv[0],"smb://", 6) && !strncmp(argv[1],"smb://", 6)) {
  80           argv++;
  81           argc--;
  82   }
  83
  84   if (argc == 1)
  85   {
  86    /*
  87     * NEW!  In CUPS 1.1 the backends are run with no arguments to list the
  88     *       available devices.  These can be devices served by this backend
  89     *       or any other backends (i.e. you can have an SNMP backend that
  90     *       is only used to enumerate the available network printers... :)
  91     */
  92
  93     list_devices();
  94     return (0);
  95   }
  96
  97   if (argc < 6 || argc > 7)
  98   {
  99     fprintf(stderr, "Usage: %s [DEVICE_URI] job-id user title copies options [file]\n",
 100             argv[0]);
 101     fputs("       The DEVICE_URI environment variable can also contain the\n", stderr);
 102     fputs("       destination printer:\n", stderr);
 103     fputs("\n", stderr);
 104     fputs("           smb://[username:password@][workgroup/]server[:port]/printer\n", stderr);
 105     return (1);
 106   }
 107
 108  /*
 109   * If we have 7 arguments, print the file named on the command-line.
 110   * Otherwise, print data from stdin...
 111   */
 112
 113
 114   if (argc == 6)
 115   {
 116    /*
 117     * Print from Copy stdin to a temporary file...
 118     */
 119
 120     fp     = stdin;
 121     copies = 1;
 122   }
 123   else if ((fp = fopen(argv[6], "rb")) == NULL)
 124   {
 125     perror("ERROR: Unable to open print file");
 126     return (1);
 127   }
 128   else
 129     copies = atoi(argv[4]);
 130
 131  /*
 132   * Find the URI...
 133   */
 134
 135   if (getenv("DEVICE_URI") != NULL)
 136     strncpy(uri, getenv("DEVICE_URI"), sizeof(uri) - 1);
 137   else if (strncmp(argv[0], "smb://", 6) == 0)
 138     strncpy(uri, argv[0], sizeof(uri) - 1);
 139   else
 140   {
 141     fputs("ERROR: No device URI found in DEVICE_URI environment variable or argv[0] !\n", stderr);
 142     return (1);
 143   }
 144
 145   uri[sizeof(uri) - 1] = '\0';
 146
 147  /*
 148   * Extract the destination from the URI...
 149   */
 150
 151   if ((sep = strrchr_m(uri, '@')) != NULL)
 152   {
 153     username = uri + 6;
 154     *sep++ = '\0';
 155
 156     server = sep;
 157
 158    /*
 159     * Extract password as needed...
 160     */
 161
 162     if ((password = strchr_m(username, ':')) != NULL)
 163       *password++ = '\0';
 164     else
 165       password = null_str;
 166   }
 167   else
 168   {
 169     username = null_str;
 170     password = null_str;
 171     server   = uri + 6;
 172   }
 173
 174   if ((sep = strchr_m(server, '/')) == NULL)
 175   {
 176     fputs("ERROR: Bad URI - need printer name!\n", stderr);
 177     return (1);
 178   }
 179
 180   *sep++ = '\0';
 181   printer = sep;
 182
 183   if ((sep = strchr_m(printer, '/')) != NULL)
 184   {
 185    /*
 186     * Convert to smb://[username:password@]workgroup/server/printer...
 187     */
 188
 189     *sep++ = '\0';
 190
 191     workgroup = server;
 192     server    = printer;
 193     printer   = sep;
 194   }
 195   else
 196     workgroup = NULL;
 197
 198   if ((sep = strrchr_m(server, ':')) != NULL)
 199   {
 200     *sep++ = '\0';
 201
 202     port=atoi(sep);
 203   }
 204   else
 205         port=0;
 206
 207
 208  /*
 209   * Setup the SAMBA server state...
 210   */
 211
 212   setup_logging("smbspool", True);
 213
 214   in_client = True;   /* Make sure that we tell lp_load we are */
 215
 216   load_case_tables();
 217
 218   if (!lp_load(dyn_CONFIGFILE, True, False, False, True))
 219   {
 220     fprintf(stderr, "ERROR: Can't load %s - run testparm to debug it\n", dyn_CONFIGFILE);
 221     return (1);
 222   }
 223
 224   if (workgroup == NULL)
 225     workgroup = lp_workgroup();
 226
 227   load_interfaces();
 228
 229   do
 230   {
 231     if ((cli = smb_connect(workgroup, server, port, printer, username, password, argv[2])) == NULL)
 232     {
 233       if (getenv("CLASS") == NULL)
 234       {
 235         fprintf(stderr, "ERROR: Unable to connect to CIFS host, will retry in 60 seconds...\n");
 236         sleep (60); /* should just waiting and retrying fix authentication  ??? */
 237         tries++;
 238       }
 239       else
 240       {
 241         fprintf(stderr, "ERROR: Unable to connect to CIFS host, trying next printer...\n");
 242         return (1);
 243       }
 244     }
 245   }
 246   while ((cli == NULL) && (tries < MAX_RETRY_CONNECT));
 247
 248   if (cli == NULL) {
 249         fprintf(stderr, "ERROR: Unable to connect to CIFS host after (tried %d times)\n", tries);
 250         return (1);
 251   }
 252
 253  /*
 254   * Now that we are connected to the server, ignore SIGTERM so that we
 255   * can finish out any page data the driver sends (e.g. to eject the
 256   * current page...  Only ignore SIGTERM if we are printing data from
 257   * stdin (otherwise you can't cancel raw jobs...)
 258   */
 259
 260   if (argc < 7)
 261     CatchSignal(SIGTERM, SIG_IGN);
 262
 263  /*
 264   * Queue the job...
 265   */
 266
 267   for (i = 0; i < copies; i ++)
 268     if ((status = smb_print(cli, argv[3] /* title */, fp)) != 0)
 269       break;
 270
 271   cli_shutdown(cli);
 272
 273  /*
 274   * Return the queue status...
 275   */
 276
 277   return (status);
 278 }
 279
 280
 281 /*
 282  * 'list_devices()' - List the available printers seen on the network...
 283  */
 284
 285 static void
 286 list_devices(void)
 287 {
 288  /*
 289   * Eventually, search the local workgroup for available hosts and printers.
 290   */
 291
 292   puts("network smb \"Unknown\" \"Windows Printer via SAMBA\"");
 293 }
 294
 295
 296 /*
 297  * get the name of the newest ticket cache for the uid user.
 298  * pam_krb5 defines a non default ticket cache for each user
 299  */
 300 static
 301 char * get_ticket_cache( uid_t uid )
 302 {
 303   char *ticket_file = NULL;
 304   SMB_STRUCT_DIR *tcdir;                  /* directory where ticket caches are stored */
 305   SMB_STRUCT_DIRENT *dirent;   /* directory entry */
 306   char *filename = NULL;       /* holds file names on the tmp directory */
 307   SMB_STRUCT_STAT buf;
 308   char user_cache_prefix[CC_MAX_FILE_LEN];
 309   char file_path[CC_MAX_FILE_PATH_LEN];
 310   time_t t = 0;
 311
 312   snprintf(user_cache_prefix, CC_MAX_FILE_LEN, "%s%d", CC_PREFIX, uid );
 313   tcdir = sys_opendir( TICKET_CC_DIR );
 314   if ( tcdir == NULL )
 315     return NULL;
 316
 317   while ( (dirent = sys_readdir( tcdir ) ) )
 318   {
 319     filename = dirent->d_name;
 320     snprintf(file_path, CC_MAX_FILE_PATH_LEN,"%s/%s", TICKET_CC_DIR, filename);
 321     if (sys_stat(file_path, &buf) == 0 )
 322     {
 323       if ( ( buf.st_uid == uid ) && ( S_ISREG(buf.st_mode) ) )
 324       {
 325         /*
 326          * check the user id of the file to prevent denial of
 327          * service attacks by creating fake ticket caches for the
 328          * user
 329          */
 330         if ( strstr( filename, user_cache_prefix ) )
 331         {
 332           if ( buf.st_mtime > t )
 333           {
 334             /*
 335              * a newer ticket cache found
 336              */
 337             free(ticket_file);
 338             ticket_file=SMB_STRDUP(file_path);
 339             t = buf.st_mtime;
 340           }
 341         }
 342       }
 343     }
 344   }
 345
 346   sys_closedir(tcdir);
 347
 348   if ( ticket_file == NULL )
 349   {
 350     /* no ticket cache found */
 351     fprintf(stderr, "ERROR: No ticket cache found for userid=%d\n", uid);
 352     return NULL;
 353   }
 354
 355   return ticket_file;
 356 }
 357
 358 static struct cli_state
 359 *smb_complete_connection(const char *myname,
 360             const char *server,
 361             int port,
 362             const char *username,
 363             const char *password,
 364             const char *workgroup,
 365             const char *share,
 366             int flags)
 367 {
 368   struct cli_state  *cli;    /* New connection */
 369   NTSTATUS nt_status;
 370
 371   /* Start the SMB connection */
 372   nt_status = cli_start_connection( &cli, myname, server, NULL, port,
 373                                     Undefined, flags, NULL);
 374   if (!NT_STATUS_IS_OK(nt_status))
 375   {
 376     return NULL;
 377   }
 378
 379   /* We pretty much guarentee password must be valid or a pointer
 380      to a 0 char. */
 381   if (!password) {
 382     return NULL;
 383   }
 384
 385   if ( (username) && (*username) &&
 386       (strlen(password) == 0 ) &&
 387        (cli->use_kerberos) )
 388   {
 389     /* Use kerberos authentication */
 390     struct passwd *pw;
 391     char *cache_file;
 392
 393
 394     if ( !(pw = sys_getpwnam(username)) ) {
 395       fprintf(stderr,"ERROR Can not get %s uid\n", username);
 396       cli_shutdown(cli);
 397       return NULL;
 398     }
 399
 400     /*
 401      * Get the ticket cache of the user to set KRB5CCNAME env
 402      * variable
 403      */
 404     cache_file = get_ticket_cache( pw->pw_uid );
 405     if ( cache_file == NULL )
 406     {
 407       fprintf(stderr, "ERROR: Can not get the ticket cache for %s\n", username);
 408       cli_shutdown(cli);
 409       return NULL;
 410     }
 411
 412     if ( setenv(KRB5CCNAME, cache_file, OVERWRITE) < 0 )
 413     {
 414       fprintf(stderr, "ERROR: Can not add KRB5CCNAME to the environment");
 415       cli_shutdown(cli);
 416       free(cache_file);
 417       return NULL;
 418     }
 419     free(cache_file);
 420
 421     /*
 422      * Change the UID of the process to be able to read the kerberos
 423      * ticket cache
 424      */
 425     setuid(pw->pw_uid);
 426
 427   }
 428
 429
 430   if (!cli_session_setup(cli, username, password, strlen(password)+1,
 431                          password, strlen(password)+1,
 432                          workgroup))
 433   {
 434     fprintf(stderr,"ERROR: Session setup failed: %s\n", cli_errstr(cli));
 435     if (NT_STATUS_V(cli_nt_error(cli)) ==
 436         NT_STATUS_V(NT_STATUS_MORE_PROCESSING_REQUIRED))
 437     {
 438       fprintf(stderr, "did you forget to run kinit?\n");
 439     }
 440     cli_shutdown(cli);
 441
 442     return NULL;
 443   }
 444
 445   if (!cli_send_tconX(cli, share, "?????", password, strlen(password)+1))
 446   {
 447     fprintf(stderr, "ERROR: Tree connect failed (%s)\n", cli_errstr(cli));
 448     cli_shutdown(cli);
 449     return NULL;
 450   }
 451
 452   return cli;
 453 }
 454
 455 /*
 456  * 'smb_connect()' - Return a connection to a server.
 457  */
 458
 459 static struct cli_state *    /* O - SMB connection */
 460 smb_connect(const char *workgroup,    /* I - Workgroup */
 461             const char *server,    /* I - Server */
 462             const int port,    /* I - Port */
 463             const char *share,    /* I - Printer */
 464             const char *username,    /* I - Username */
 465             const char *password,    /* I - Password */
 466       const char *jobusername)   /* I - User who issued the print job */
 467 {
 468   struct cli_state  *cli;    /* New connection */
 469   pstring    myname;    /* Client name */
 470   struct passwd *pwd;
 471
 472  /*
 473   * Get the names and addresses of the client and server...
 474   */
 475
 476   get_myname(myname);
 477
 478   /* See if we have a username first.  This is for backwards compatible
 479      behavior with 3.0.14a */
 480
 481   if ( username &&  *username )
 482   {
 483       cli = smb_complete_connection(myname, server, port, username,
 484                                     password, workgroup, share, 0 );
 485       if (cli)
 486         return cli;
 487   }
 488
 489   /*
 490    * Try to use the user kerberos credentials (if any) to authenticate
 491    */
 492   cli = smb_complete_connection(myname, server, port, jobusername, "",
 493                                 workgroup, share,
 494                                 CLI_FULL_CONNECTION_USE_KERBEROS );
 495
 496   if (cli ) { return cli; }
 497
 498   /* give a chance for a passwordless NTLMSSP session setup */
 499
 500   pwd = getpwuid(geteuid());
 501   if (pwd == NULL) {
 502      return NULL;
 503   }
 504
 505   cli = smb_complete_connection(myname, server, port, pwd->pw_name, "",
 506                                 workgroup, share, 0);
 507
 508   if (cli) { return cli; }
 509
 510   /*
 511    * last try. Use anonymous authentication
 512    */
 513
 514   cli = smb_complete_connection(myname, server, port, "", "",
 515                                 workgroup, share, 0);
 516   /*
 517    * Return the new connection...
 518    */
 519
 520   return (cli);
 521 }
 522
 523
 524 /*
 525  * 'smb_print()' - Queue a job for printing using the SMB protocol.
 526  */
 527
 528 static int                              /* O - 0 = success, non-0 = failure */
 529 smb_print(struct cli_state *cli,        /* I - SMB connection */
 530           char             *title,      /* I - Title/job name */
 531           FILE             *fp)         /* I - File to print */
 532 {
 533   int   fnum;           /* File number */
 534   int   nbytes,         /* Number of bytes read */
 535         tbytes;         /* Total bytes read */
 536   char  buffer[8192],   /* Buffer for copy */
 537         *ptr;           /* Pointer into tile */
 538
 539
 540  /*
 541   * Sanitize the title...
 542   */
 543
 544   for (ptr = title; *ptr; ptr ++)
 545     if (!isalnum((int)*ptr) && !isspace((int)*ptr))
 546       *ptr = '_';
 547
 548  /*
 549   * Open the printer device...
 550   */
 551
 552   if ((fnum = cli_open(cli, title, O_RDWR | O_CREAT | O_TRUNC, DENY_NONE)) == -1)
 553   {
 554     fprintf(stderr, "ERROR: %s opening remote spool %s\n",
 555             cli_errstr(cli), title);
 556     return (1);
 557   }
 558
 559  /*
 560   * Copy the file to the printer...
 561   */
 562
 563   if (fp != stdin)
 564     rewind(fp);
 565
 566   tbytes = 0;
 567
 568   while ((nbytes = fread(buffer, 1, sizeof(buffer), fp)) > 0)
 569   {
 570     if (cli_write(cli, fnum, 0, buffer, tbytes, nbytes) != nbytes)
 571     {
 572       fprintf(stderr, "ERROR: Error writing spool: %s\n", cli_errstr(cli));
 573       break;
 574     }
 575
 576     tbytes += nbytes;
 577   }
 578
 579   if (!cli_close(cli, fnum))
 580   {
 581     fprintf(stderr, "ERROR: %s closing remote spool %s\n",
 582             cli_errstr(cli), title);
 583     return (1);
 584   }
 585   else
 586     return (0);
 587 }