source3/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 PW_MAX_BUF_SIZE          sysconf(_SC_GETPW_R_SIZE_MAX)
  27 #define TICKET_CC_DIR            "/tmp"
  28 #define CC_PREFIX                "krb5cc_" /* prefix of the ticket cache */
  29 #define CC_MAX_FILE_LEN          24
  30 #define CC_MAX_FILE_PATH_LEN     (sizeof(TICKET_CC_DIR)-1)+ CC_MAX_FILE_LEN+2
  31 #define OVERWRITE                1
  32 #define KRB5CCNAME               "KRB5CCNAME"
  33 #define MAX_RETRY_CONNECT        3
  34
  35
  36 /*
  37  * Globals...
  38  */
  39
  40 extern BOOL             in_client;      /* Boolean for client library */
  41
  42
  43 /*
  44  * Local functions...
  45  */
  46
  47 static void             list_devices(void);
  48 static struct cli_state *smb_complete_connection(const char *, const char *,int , const char *, const char *, const char *, const char *, int);
  49 static struct cli_state *smb_connect(const char *, const char *, int, const char *, const char *, const char *, const char *);
  50 static int              smb_print(struct cli_state *, char *, FILE *);
  51
  52
  53 /*
  54  * 'main()' - Main entry for SMB backend.
  55  */
  56
  57  int                            /* O - Exit status */
  58  main(int  argc,                        /* I - Number of command-line arguments */
  59      char *argv[])              /* I - Command-line arguments */
  60 {
  61   int           i;              /* Looping var */
  62   int           copies;         /* Number of copies */
  63   int           port;           /* Port number */
  64   char          uri[1024],      /* URI */
  65                 *sep,           /* Pointer to separator */
  66                 *password;      /* Password */
  67   const char    *username,      /* Username */
  68                 *server,        /* Server name */
  69                 *printer;       /* Printer name */
  70   const char    *workgroup;     /* Workgroup */
  71   FILE          *fp;            /* File to print */
  72   int           status=0;               /* Status of LPD job */
  73   struct cli_state *cli;        /* SMB interface */
  74   char null_str[1];
  75   int tries = 0;
  76
  77   null_str[0] = '\0';
  78
  79   /* we expect the URI in argv[0]. Detect the case where it is in argv[1] and cope */
  80   if (argc > 2 && strncmp(argv[0],"smb://", 6) && !strncmp(argv[1],"smb://", 6)) {
  81           argv++;
  82           argc--;
  83   }
  84
  85   if (argc == 1)
  86   {
  87    /*
  88     * NEW!  In CUPS 1.1 the backends are run with no arguments to list the
  89     *       available devices.  These can be devices served by this backend
  90     *       or any other backends (i.e. you can have an SNMP backend that
  91     *       is only used to enumerate the available network printers... :)
  92     */
  93
  94     list_devices();
  95     return (0);
  96   }
  97
  98   if (argc < 6 || argc > 7)
  99   {
 100     fprintf(stderr, "Usage: %s [DEVICE_URI] job-id user title copies options [file]\n",
 101             argv[0]);
 102     fputs("       The DEVICE_URI environment variable can also contain the\n", stderr);
 103     fputs("       destination printer:\n", stderr);
 104     fputs("\n", stderr);
 105     fputs("           smb://[username:password@][workgroup/]server[:port]/printer\n", stderr);
 106     return (1);
 107   }
 108
 109  /*
 110   * If we have 7 arguments, print the file named on the command-line.
 111   * Otherwise, print data from stdin...
 112   */
 113
 114
 115   if (argc == 6)
 116   {
 117    /*
 118     * Print from Copy stdin to a temporary file...
 119     */
 120
 121     fp     = stdin;
 122     copies = 1;
 123   }
 124   else if ((fp = fopen(argv[6], "rb")) == NULL)
 125   {
 126     perror("ERROR: Unable to open print file");
 127     return (1);
 128   }
 129   else
 130     copies = atoi(argv[4]);
 131
 132  /*
 133   * Find the URI...
 134   */
 135
 136   if (getenv("DEVICE_URI") != NULL)
 137     strncpy(uri, getenv("DEVICE_URI"), sizeof(uri) - 1);
 138   else if (strncmp(argv[0], "smb://", 6) == 0)
 139     strncpy(uri, argv[0], sizeof(uri) - 1);
 140   else
 141   {
 142     fputs("ERROR: No device URI found in DEVICE_URI environment variable or argv[0] !\n", stderr);
 143     return (1);
 144   }
 145
 146   uri[sizeof(uri) - 1] = '\0';
 147
 148  /*
 149   * Extract the destination from the URI...
 150   */
 151
 152   if ((sep = strrchr_m(uri, '@')) != NULL)
 153   {
 154     username = uri + 6;
 155     *sep++ = '\0';
 156
 157     server = sep;
 158
 159    /*
 160     * Extract password as needed...
 161     */
 162
 163     if ((password = strchr_m(username, ':')) != NULL)
 164       *password++ = '\0';
 165     else
 166       password = null_str;
 167   }
 168   else
 169   {
 170     username = null_str;
 171     password = null_str;
 172     server   = uri + 6;
 173   }
 174
 175   if ((sep = strchr_m(server, '/')) == NULL)
 176   {
 177     fputs("ERROR: Bad URI - need printer name!\n", stderr);
 178     return (1);
 179   }
 180
 181   *sep++ = '\0';
 182   printer = sep;
 183
 184   if ((sep = strchr_m(printer, '/')) != NULL)
 185   {
 186    /*
 187     * Convert to smb://[username:password@]workgroup/server/printer...
 188     */
 189
 190     *sep++ = '\0';
 191
 192     workgroup = server;
 193     server    = printer;
 194     printer   = sep;
 195   }
 196   else
 197     workgroup = NULL;
 198
 199   if ((sep = strrchr_m(server, ':')) != NULL)
 200   {
 201     *sep++ = '\0';
 202
 203     port=atoi(sep);
 204   }
 205   else
 206         port=0;
 207
 208
 209  /*
 210   * Setup the SAMBA server state...
 211   */
 212
 213   setup_logging("smbspool", True);
 214
 215   in_client = True;   /* Make sure that we tell lp_load we are */
 216
 217   if (!lp_load(dyn_CONFIGFILE, True, False, False, True))
 218   {
 219     fprintf(stderr, "ERROR: Can't load %s - run testparm to debug it\n", dyn_CONFIGFILE);
 220     return (1);
 221   }
 222
 223   if (workgroup == NULL)
 224     workgroup = lp_workgroup();
 225
 226   load_interfaces();
 227
 228   do
 229   {
 230     if ((cli = smb_connect(workgroup, server, port, printer, username, password, argv[2])) == NULL)
 231     {
 232       if (getenv("CLASS") == NULL)
 233       {
 234         fprintf(stderr, "ERROR: Unable to connect to CIFS host, will retry in 60 seconds...\n");
 235         sleep (60); /* should just waiting and retrying fix authentication  ??? */
 236         tries++;
 237       }
 238       else
 239       {
 240         fprintf(stderr, "ERROR: Unable to connect to CIFS host, trying next printer...\n");
 241         return (1);
 242       }
 243     }
 244   }
 245   while ((cli == NULL) && (tries < MAX_RETRY_CONNECT));
 246
 247   if (cli == NULL) {
 248         fprintf(stderr, "ERROR: Unable to connect to CIFS host after (tried %d times)\n", tries);
 249         return (1);
 250   }
 251
 252  /*
 253   * Now that we are connected to the server, ignore SIGTERM so that we
 254   * can finish out any page data the driver sends (e.g. to eject the
 255   * current page...  Only ignore SIGTERM if we are printing data from
 256   * stdin (otherwise you can't cancel raw jobs...)
 257   */
 258
 259   if (argc < 7)
 260     CatchSignal(SIGTERM, SIG_IGN);
 261
 262  /*
 263   * Queue the job...
 264   */
 265
 266   for (i = 0; i < copies; i ++)
 267     if ((status = smb_print(cli, argv[3] /* title */, fp)) != 0)
 268       break;
 269
 270   cli_shutdown(cli);
 271
 272  /*
 273   * Return the queue status...
 274   */
 275
 276   return (status);
 277 }
 278
 279
 280 /*
 281  * 'list_devices()' - List the available printers seen on the network...
 282  */
 283
 284 static void
 285 list_devices(void)
 286 {
 287  /*
 288   * Eventually, search the local workgroup for available hosts and printers.
 289   */
 290
 291   puts("network smb \"Unknown\" \"Windows Printer via SAMBA\"");
 292 }
 293
 294
 295 /*
 296  * get the name of the newest ticket cache for the uid user.
 297  * pam_krb5 defines a non default ticket cache for each user
 298  */
 299 static
 300 char * get_ticket_cache( uid_t uid )
 301 {
 302   char *ticket_file = NULL;
 303   SMB_STRUCT_DIR *tcdir;                  /* directory where ticket caches are stored */
 304   SMB_STRUCT_DIRENT *dirent;   /* directory entry */
 305   char *filename = NULL;       /* holds file names on the tmp directory */
 306   SMB_STRUCT_STAT buf;
 307   char user_cache_prefix[CC_MAX_FILE_LEN];
 308   char file_path[CC_MAX_FILE_PATH_LEN];
 309   time_t t = 0;
 310
 311   snprintf(user_cache_prefix, CC_MAX_FILE_LEN, "%s%d", CC_PREFIX, uid );
 312   tcdir = sys_opendir( TICKET_CC_DIR );
 313   if ( tcdir == NULL )
 314     return NULL;
 315
 316   while ( (dirent = sys_readdir( tcdir ) ) )
 317   {
 318     filename = dirent->d_name;
 319     snprintf(file_path, CC_MAX_FILE_PATH_LEN,"%s/%s", TICKET_CC_DIR, filename);
 320     if (sys_stat(file_path, &buf) == 0 )
 321     {
 322       if ( ( buf.st_uid == uid ) && ( S_ISREG(buf.st_mode) ) )
 323       {
 324         /*
 325          * check the user id of the file to prevent denial of
 326          * service attacks by creating fake ticket caches for the
 327          * user
 328          */
 329         if ( strstr( filename, user_cache_prefix ) )
 330         {
 331           if ( buf.st_mtime > t )
 332           {
 333             /*
 334              * a newer ticket cache found
 335              */
 336             free(ticket_file);
 337             ticket_file=SMB_STRDUP(file_path);
 338             t = buf.st_mtime;
 339           }
 340         }
 341       }
 342     }
 343   }
 344
 345   sys_closedir(tcdir);
 346
 347   if ( ticket_file == NULL )
 348   {
 349     /* no ticket cache found */
 350     fprintf(stderr, "ERROR: No ticket cache found for userid=%d\n", uid);
 351     return NULL;
 352   }
 353
 354   return ticket_file;
 355 }
 356
 357 static struct cli_state
 358 *smb_complete_connection(const char *myname,
 359             const char *server,
 360             int port,
 361             const char *username,
 362             const char *password,
 363             const char *workgroup,
 364             const char *share,
 365             int flags)
 366 {
 367   struct cli_state  *cli;    /* New connection */
 368   NTSTATUS nt_status;
 369
 370   /* Start the SMB connection */
 371   nt_status = cli_start_connection( &cli, myname, server, NULL, port,
 372                                     Undefined, flags, NULL);
 373   if (!NT_STATUS_IS_OK(nt_status))
 374   {
 375     return NULL;
 376   }
 377
 378
 379   if ( (username) && (*username) &&
 380       ((!password) || ((password) && (strlen(password) == 0 ))) &&
 381        (cli->use_kerberos) )
 382   {
 383     /* Use kerberos authentication */
 384     struct passwd *pw;
 385     char *cache_file;
 386
 387
 388     if ( !(pw = sys_getpwnam(username)) ) {
 389       fprintf(stderr,"ERROR Can not get %s uid\n", username);
 390       cli_shutdown(cli);
 391       return NULL;
 392     }
 393
 394     /*
 395      * Get the ticket cache of the user to set KRB5CCNAME env
 396      * variable
 397      */
 398     cache_file = get_ticket_cache( pw->pw_uid );
 399     if ( cache_file == NULL )
 400     {
 401       fprintf(stderr, "ERROR: Can not get the ticket cache for %s\n", username);
 402       cli_shutdown(cli);
 403       return NULL;
 404     }
 405
 406     if ( setenv(KRB5CCNAME, cache_file, OVERWRITE) < 0 )
 407     {
 408       fprintf(stderr, "ERROR: Can not add KRB5CCNAME to the environment");
 409       cli_shutdown(cli);
 410       free(cache_file);
 411       return NULL;
 412     }
 413     free(cache_file);
 414
 415     /*
 416      * Change the UID of the process to be able to read the kerberos
 417      * ticket cache
 418      */
 419     setuid(pw->pw_uid);
 420
 421   }
 422
 423
 424   if (!cli_session_setup(cli, username, password, strlen(password)+1,
 425                          password, strlen(password)+1,
 426                          workgroup))
 427   {
 428     fprintf(stderr,"ERROR: Session setup failed: %s\n", cli_errstr(cli));
 429     if (NT_STATUS_V(cli_nt_error(cli)) ==
 430         NT_STATUS_V(NT_STATUS_MORE_PROCESSING_REQUIRED))
 431     {
 432       fprintf(stderr, "did you forget to run kinit?\n");
 433     }
 434     cli_shutdown(cli);
 435
 436     return NULL;
 437   }
 438
 439   if (!cli_send_tconX(cli, share, "?????", password, strlen(password)+1))
 440   {
 441     fprintf(stderr, "ERROR: Tree connect failed (%s)\n", cli_errstr(cli));
 442     cli_shutdown(cli);
 443     return NULL;
 444   }
 445
 446   return cli;
 447 }
 448
 449 /*
 450  * 'smb_connect()' - Return a connection to a server.
 451  */
 452
 453 static struct cli_state *    /* O - SMB connection */
 454 smb_connect(const char *workgroup,    /* I - Workgroup */
 455             const char *server,    /* I - Server */
 456             const int port,    /* I - Port */
 457             const char *share,    /* I - Printer */
 458             const char *username,    /* I - Username */
 459             const char *password,    /* I - Password */
 460       const char *jobusername)   /* I - User who issued the print job */
 461 {
 462   struct cli_state  *cli;    /* New connection */
 463   pstring    myname;    /* Client name */
 464   struct passwd *pwd;
 465
 466  /*
 467   * Get the names and addresses of the client and server...
 468   */
 469
 470   get_myname(myname);
 471
 472   /* See if we have a username first.  This is for backwards compatible
 473      behavior with 3.0.14a */
 474
 475   if ( username &&  *username )
 476   {
 477       cli = smb_complete_connection(myname, server, port, username,
 478                                     password, workgroup, share, 0 );
 479       if (cli)
 480         return cli;
 481   }
 482
 483   /*
 484    * Try to use the user kerberos credentials (if any) to authenticate
 485    */
 486   cli = smb_complete_connection(myname, server, port, jobusername, "",
 487                                 workgroup, share,
 488                                 CLI_FULL_CONNECTION_USE_KERBEROS );
 489
 490   if (cli ) { return cli; }
 491
 492   /* give a chance for a passwordless NTLMSSP session setup */
 493
 494   pwd = getpwuid(geteuid());
 495   if (pwd == NULL) {
 496      return NULL;
 497   }
 498
 499   cli = smb_complete_connection(myname, server, port, pwd->pw_name, "",
 500                                 workgroup, share, 0);
 501
 502   if (cli) { return cli; }
 503
 504   /*
 505    * last try. Use anonymous authentication
 506    */
 507
 508   cli = smb_complete_connection(myname, server, port, "", "",
 509                                 workgroup, share, 0);
 510   /*
 511    * Return the new connection...
 512    */
 513
 514   return (cli);
 515 }
 516
 517
 518 /*
 519  * 'smb_print()' - Queue a job for printing using the SMB protocol.
 520  */
 521
 522 static int                              /* O - 0 = success, non-0 = failure */
 523 smb_print(struct cli_state *cli,        /* I - SMB connection */
 524           char             *title,      /* I - Title/job name */
 525           FILE             *fp)         /* I - File to print */
 526 {
 527   int   fnum;           /* File number */
 528   int   nbytes,         /* Number of bytes read */
 529         tbytes;         /* Total bytes read */
 530   char  buffer[8192],   /* Buffer for copy */
 531         *ptr;           /* Pointer into tile */
 532
 533
 534  /*
 535   * Sanitize the title...
 536   */
 537
 538   for (ptr = title; *ptr; ptr ++)
 539     if (!isalnum((int)*ptr) && !isspace((int)*ptr))
 540       *ptr = '_';
 541
 542  /*
 543   * Open the printer device...
 544   */
 545
 546   if ((fnum = cli_open(cli, title, O_RDWR | O_CREAT | O_TRUNC, DENY_NONE)) == -1)
 547   {
 548     fprintf(stderr, "ERROR: %s opening remote spool %s\n",
 549             cli_errstr(cli), title);
 550     return (1);
 551   }
 552
 553  /*
 554   * Copy the file to the printer...
 555   */
 556
 557   if (fp != stdin)
 558     rewind(fp);
 559
 560   tbytes = 0;
 561
 562   while ((nbytes = fread(buffer, 1, sizeof(buffer), fp)) > 0)
 563   {
 564     if (cli_write(cli, fnum, 0, buffer, tbytes, nbytes) != nbytes)
 565     {
 566       fprintf(stderr, "ERROR: Error writing spool: %s\n", cli_errstr(cli));
 567       break;
 568     }
 569
 570     tbytes += nbytes;
 571   }
 572
 573   if (!cli_close(cli, fnum))
 574   {
 575     fprintf(stderr, "ERROR: %s closing remote spool %s\n",
 576             cli_errstr(cli), title);
 577     return (1);
 578   }
 579   else
 580     return (0);
 581 }