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   const char *dev_uri;
  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   dev_uri = getenv("DEVICE_URI");
 137   if (dev_uri)
 138     strncpy(uri, dev_uri, sizeof(uri) - 1);
 139   else if (strncmp(argv[0], "smb://", 6) == 0)
 140     strncpy(uri, argv[0], sizeof(uri) - 1);
 141   else
 142   {
 143     fputs("ERROR: No device URI found in DEVICE_URI environment variable or argv[0] !\n", stderr);
 144     return (1);
 145   }
 146
 147   uri[sizeof(uri) - 1] = '\0';
 148
 149  /*
 150   * Extract the destination from the URI...
 151   */
 152
 153   if ((sep = strrchr_m(uri, '@')) != NULL)
 154   {
 155     username = uri + 6;
 156     *sep++ = '\0';
 157
 158     server = sep;
 159
 160    /*
 161     * Extract password as needed...
 162     */
 163
 164     if ((password = strchr_m(username, ':')) != NULL)
 165       *password++ = '\0';
 166     else
 167       password = null_str;
 168   }
 169   else
 170   {
 171     username = null_str;
 172     password = null_str;
 173     server   = uri + 6;
 174   }
 175
 176   if ((sep = strchr_m(server, '/')) == NULL)
 177   {
 178     fputs("ERROR: Bad URI - need printer name!\n", stderr);
 179     return (1);
 180   }
 181
 182   *sep++ = '\0';
 183   printer = sep;
 184
 185   if ((sep = strchr_m(printer, '/')) != NULL)
 186   {
 187    /*
 188     * Convert to smb://[username:password@]workgroup/server/printer...
 189     */
 190
 191     *sep++ = '\0';
 192
 193     workgroup = server;
 194     server    = printer;
 195     printer   = sep;
 196   }
 197   else
 198     workgroup = NULL;
 199
 200   if ((sep = strrchr_m(server, ':')) != NULL)
 201   {
 202     *sep++ = '\0';
 203
 204     port=atoi(sep);
 205   }
 206   else
 207         port=0;
 208
 209
 210  /*
 211   * Setup the SAMBA server state...
 212   */
 213
 214   setup_logging("smbspool", True);
 215
 216   in_client = True;   /* Make sure that we tell lp_load we are */
 217
 218   load_case_tables();
 219
 220   if (!lp_load(dyn_CONFIGFILE, True, False, False, True))
 221   {
 222     fprintf(stderr, "ERROR: Can't load %s - run testparm to debug it\n", dyn_CONFIGFILE);
 223     return (1);
 224   }
 225
 226   if (workgroup == NULL)
 227     workgroup = lp_workgroup();
 228
 229   load_interfaces();
 230
 231   do
 232   {
 233     if ((cli = smb_connect(workgroup, server, port, printer, username, password, argv[2])) == NULL)
 234     {
 235       if (getenv("CLASS") == NULL)
 236       {
 237         fprintf(stderr, "ERROR: Unable to connect to CIFS host, will retry in 60 seconds...\n");
 238         sleep (60); /* should just waiting and retrying fix authentication  ??? */
 239         tries++;
 240       }
 241       else
 242       {
 243         fprintf(stderr, "ERROR: Unable to connect to CIFS host, trying next printer...\n");
 244         return (1);
 245       }
 246     }
 247   }
 248   while ((cli == NULL) && (tries < MAX_RETRY_CONNECT));
 249
 250   if (cli == NULL) {
 251         fprintf(stderr, "ERROR: Unable to connect to CIFS host after (tried %d times)\n", tries);
 252         return (1);
 253   }
 254
 255  /*
 256   * Now that we are connected to the server, ignore SIGTERM so that we
 257   * can finish out any page data the driver sends (e.g. to eject the
 258   * current page...  Only ignore SIGTERM if we are printing data from
 259   * stdin (otherwise you can't cancel raw jobs...)
 260   */
 261
 262   if (argc < 7)
 263     CatchSignal(SIGTERM, SIG_IGN);
 264
 265  /*
 266   * Queue the job...
 267   */
 268
 269   for (i = 0; i < copies; i ++)
 270     if ((status = smb_print(cli, argv[3] /* title */, fp)) != 0)
 271       break;
 272
 273   cli_shutdown(cli);
 274
 275  /*
 276   * Return the queue status...
 277   */
 278
 279   return (status);
 280 }
 281
 282
 283 /*
 284  * 'list_devices()' - List the available printers seen on the network...
 285  */
 286
 287 static void
 288 list_devices(void)
 289 {
 290  /*
 291   * Eventually, search the local workgroup for available hosts and printers.
 292   */
 293
 294   puts("network smb \"Unknown\" \"Windows Printer via SAMBA\"");
 295 }
 296
 297
 298 /*
 299  * get the name of the newest ticket cache for the uid user.
 300  * pam_krb5 defines a non default ticket cache for each user
 301  */
 302 static
 303 char * get_ticket_cache( uid_t uid )
 304 {
 305   char *ticket_file = NULL;
 306   SMB_STRUCT_DIR *tcdir;                  /* directory where ticket caches are stored */
 307   SMB_STRUCT_DIRENT *dirent;   /* directory entry */
 308   char *filename = NULL;       /* holds file names on the tmp directory */
 309   SMB_STRUCT_STAT buf;
 310   char user_cache_prefix[CC_MAX_FILE_LEN];
 311   char file_path[CC_MAX_FILE_PATH_LEN];
 312   time_t t = 0;
 313
 314   snprintf(user_cache_prefix, CC_MAX_FILE_LEN, "%s%d", CC_PREFIX, uid );
 315   tcdir = sys_opendir( TICKET_CC_DIR );
 316   if ( tcdir == NULL )
 317     return NULL;
 318
 319   while ( (dirent = sys_readdir( tcdir ) ) )
 320   {
 321     filename = dirent->d_name;
 322     snprintf(file_path, CC_MAX_FILE_PATH_LEN,"%s/%s", TICKET_CC_DIR, filename);
 323     if (sys_stat(file_path, &buf) == 0 )
 324     {
 325       if ( ( buf.st_uid == uid ) && ( S_ISREG(buf.st_mode) ) )
 326       {
 327         /*
 328          * check the user id of the file to prevent denial of
 329          * service attacks by creating fake ticket caches for the
 330          * user
 331          */
 332         if ( strstr( filename, user_cache_prefix ) )
 333         {
 334           if ( buf.st_mtime > t )
 335           {
 336             /*
 337              * a newer ticket cache found
 338              */
 339             free(ticket_file);
 340             ticket_file=SMB_STRDUP(file_path);
 341             t = buf.st_mtime;
 342           }
 343         }
 344       }
 345     }
 346   }
 347
 348   sys_closedir(tcdir);
 349
 350   if ( ticket_file == NULL )
 351   {
 352     /* no ticket cache found */
 353     fprintf(stderr, "ERROR: No ticket cache found for userid=%d\n", uid);
 354     return NULL;
 355   }
 356
 357   return ticket_file;
 358 }
 359
 360 static struct cli_state
 361 *smb_complete_connection(const char *myname,
 362             const char *server,
 363             int port,
 364             const char *username,
 365             const char *password,
 366             const char *workgroup,
 367             const char *share,
 368             int flags)
 369 {
 370   struct cli_state  *cli;    /* New connection */
 371   NTSTATUS nt_status;
 372
 373   /* Start the SMB connection */
 374   nt_status = cli_start_connection( &cli, myname, server, NULL, port,
 375                                     Undefined, flags, NULL);
 376   if (!NT_STATUS_IS_OK(nt_status))
 377   {
 378     return NULL;
 379   }
 380
 381   /* We pretty much guarentee password must be valid or a pointer
 382      to a 0 char. */
 383   if (!password) {
 384     return NULL;
 385   }
 386
 387   if ( (username) && (*username) &&
 388       (strlen(password) == 0 ) &&
 389        (cli->use_kerberos) )
 390   {
 391     /* Use kerberos authentication */
 392     struct passwd *pw;
 393     char *cache_file;
 394
 395
 396     if ( !(pw = sys_getpwnam(username)) ) {
 397       fprintf(stderr,"ERROR Can not get %s uid\n", username);
 398       cli_shutdown(cli);
 399       return NULL;
 400     }
 401
 402     /*
 403      * Get the ticket cache of the user to set KRB5CCNAME env
 404      * variable
 405      */
 406     cache_file = get_ticket_cache( pw->pw_uid );
 407     if ( cache_file == NULL )
 408     {
 409       fprintf(stderr, "ERROR: Can not get the ticket cache for %s\n", username);
 410       cli_shutdown(cli);
 411       return NULL;
 412     }
 413
 414     if ( setenv(KRB5CCNAME, cache_file, OVERWRITE) < 0 )
 415     {
 416       fprintf(stderr, "ERROR: Can not add KRB5CCNAME to the environment");
 417       cli_shutdown(cli);
 418       free(cache_file);
 419       return NULL;
 420     }
 421     free(cache_file);
 422
 423     /*
 424      * Change the UID of the process to be able to read the kerberos
 425      * ticket cache
 426      */
 427     setuid(pw->pw_uid);
 428
 429   }
 430
 431
 432   if (!cli_session_setup(cli, username, password, strlen(password)+1,
 433                          password, strlen(password)+1,
 434                          workgroup))
 435   {
 436     fprintf(stderr,"ERROR: Session setup failed: %s\n", cli_errstr(cli));
 437     if (NT_STATUS_V(cli_nt_error(cli)) ==
 438         NT_STATUS_V(NT_STATUS_MORE_PROCESSING_REQUIRED))
 439     {
 440       fprintf(stderr, "did you forget to run kinit?\n");
 441     }
 442     cli_shutdown(cli);
 443
 444     return NULL;
 445   }
 446
 447   if (!cli_send_tconX(cli, share, "?????", password, strlen(password)+1))
 448   {
 449     fprintf(stderr, "ERROR: Tree connect failed (%s)\n", cli_errstr(cli));
 450     cli_shutdown(cli);
 451     return NULL;
 452   }
 453
 454   return cli;
 455 }
 456
 457 /*
 458  * 'smb_connect()' - Return a connection to a server.
 459  */
 460
 461 static struct cli_state *    /* O - SMB connection */
 462 smb_connect(const char *workgroup,    /* I - Workgroup */
 463             const char *server,    /* I - Server */
 464             const int port,    /* I - Port */
 465             const char *share,    /* I - Printer */
 466             const char *username,    /* I - Username */
 467             const char *password,    /* I - Password */
 468       const char *jobusername)   /* I - User who issued the print job */
 469 {
 470   struct cli_state  *cli;    /* New connection */
 471   pstring    myname;    /* Client name */
 472   struct passwd *pwd;
 473
 474  /*
 475   * Get the names and addresses of the client and server...
 476   */
 477
 478   get_myname(myname);
 479
 480   /* See if we have a username first.  This is for backwards compatible
 481      behavior with 3.0.14a */
 482
 483   if ( username &&  *username )
 484   {
 485       cli = smb_complete_connection(myname, server, port, username,
 486                                     password, workgroup, share, 0 );
 487       if (cli)
 488         return cli;
 489   }
 490
 491   /*
 492    * Try to use the user kerberos credentials (if any) to authenticate
 493    */
 494   cli = smb_complete_connection(myname, server, port, jobusername, "",
 495                                 workgroup, share,
 496                                 CLI_FULL_CONNECTION_USE_KERBEROS );
 497
 498   if (cli ) { return cli; }
 499
 500   /* give a chance for a passwordless NTLMSSP session setup */
 501
 502   pwd = getpwuid(geteuid());
 503   if (pwd == NULL) {
 504      return NULL;
 505   }
 506
 507   cli = smb_complete_connection(myname, server, port, pwd->pw_name, "",
 508                                 workgroup, share, 0);
 509
 510   if (cli) { return cli; }
 511
 512   /*
 513    * last try. Use anonymous authentication
 514    */
 515
 516   cli = smb_complete_connection(myname, server, port, "", "",
 517                                 workgroup, share, 0);
 518   /*
 519    * Return the new connection...
 520    */
 521
 522   return (cli);
 523 }
 524
 525
 526 /*
 527  * 'smb_print()' - Queue a job for printing using the SMB protocol.
 528  */
 529
 530 static int                              /* O - 0 = success, non-0 = failure */
 531 smb_print(struct cli_state *cli,        /* I - SMB connection */
 532           char             *title,      /* I - Title/job name */
 533           FILE             *fp)         /* I - File to print */
 534 {
 535   int   fnum;           /* File number */
 536   int   nbytes,         /* Number of bytes read */
 537         tbytes;         /* Total bytes read */
 538   char  buffer[8192],   /* Buffer for copy */
 539         *ptr;           /* Pointer into tile */
 540
 541
 542  /*
 543   * Sanitize the title...
 544   */
 545
 546   for (ptr = title; *ptr; ptr ++)
 547     if (!isalnum((int)*ptr) && !isspace((int)*ptr))
 548       *ptr = '_';
 549
 550  /*
 551   * Open the printer device...
 552   */
 553
 554   if ((fnum = cli_open(cli, title, O_RDWR | O_CREAT | O_TRUNC, DENY_NONE)) == -1)
 555   {
 556     fprintf(stderr, "ERROR: %s opening remote spool %s\n",
 557             cli_errstr(cli), title);
 558     return (1);
 559   }
 560
 561  /*
 562   * Copy the file to the printer...
 563   */
 564
 565   if (fp != stdin)
 566     rewind(fp);
 567
 568   tbytes = 0;
 569
 570   while ((nbytes = fread(buffer, 1, sizeof(buffer), fp)) > 0)
 571   {
 572     if (cli_write(cli, fnum, 0, buffer, tbytes, nbytes) != nbytes)
 573     {
 574       fprintf(stderr, "ERROR: Error writing spool: %s\n", cli_errstr(cli));
 575       break;
 576     }
 577
 578     tbytes += nbytes;
 579   }
 580
 581   if (!cli_close(cli, fnum))
 582   {
 583     fprintf(stderr, "ERROR: %s closing remote spool %s\n",
 584             cli_errstr(cli), title);
 585     return (1);
 586   }
 587   else
 588     return (0);
 589 }