source3/client/smbspool.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    SMB backend for the Common UNIX Printing System ("CUPS")
   4
   5    Copyright (C) Michael R Sweet            1999
   6    Copyright (C) Andrew Tridgell            1994-1998
   7    Copyright (C) Andrew Bartlett            2002
   8    Copyright (C) Rodrigo Fernandez-Vizarra  2005
   9    Copyright (C) James Peach                2008
  10
  11    This program is free software; you can redistribute it and/or modify
  12    it under the terms of the GNU General Public License as published by
  13    the Free Software Foundation; either version 3 of the License, or
  14    (at your option) any later version.
  15
  16    This program is distributed in the hope that it will be useful,
  17    but WITHOUT ANY WARRANTY; without even the implied warranty of
  18    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19    GNU General Public License for more details.
  20
  21    You should have received a copy of the GNU General Public License
  22    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  23 */
  24
  25 #include "includes.h"
  26 #include "system/filesys.h"
  27 #include "system/passwd.h"
  28 #include "libsmb/libsmb.h"
  29
  30 /*
  31  * Starting with CUPS 1.3, Kerberos support is provided by cupsd including
  32  * the forwarding of user credentials via the authenticated session between
  33  * user and server and the KRB5CCNAME environment variable which will point
  34  * to a temporary file or an in-memory representation depending on the version
  35  * of Kerberos you use.  As a result, all of the ticket code that used to
  36  * live here has been removed, and we depend on the user session (if you
  37  * run smbspool by hand) or cupsd to provide the necessary Kerberos info.
  38  *
  39  * Also, the AUTH_USERNAME and AUTH_PASSWORD environment variables provide
  40  * for per-job authentication for non-Kerberized printing.  We use those
  41  * if there is no username and password specified in the device URI.
  42  *
  43  * Finally, if we have an authentication failure we return exit code 2
  44  * which tells CUPS to hold the job for authentication and bug the user
  45  * to get the necessary credentials.
  46  */
  47
  48 #define MAX_RETRY_CONNECT        3
  49
  50
  51 /*
  52  * Globals...
  53  */
  54
  55
  56
  57 /*
  58  * Local functions...
  59  */
  60
  61 static int      get_exit_code(struct cli_state * cli, NTSTATUS nt_status);
  62 static void     list_devices(void);
  63 static struct cli_state *smb_complete_connection(const char *, const char *,
  64         int, const char *, const char *, const char *, const char *, int, bool *need_auth);
  65 static struct cli_state *smb_connect(const char *, const char *, int, const
  66         char *, const char *, const char *, const char *, bool *need_auth);
  67 static int      smb_print(struct cli_state *, char *, FILE *);
  68 static char    *uri_unescape_alloc(const char *);
  69 #if 0
  70 static bool     smb_encrypt;
  71 #endif
  72
  73 /*
  74  * 'main()' - Main entry for SMB backend.
  75  */
  76
  77 int                             /* O - Exit status */
  78 main(int argc,                  /* I - Number of command-line arguments */
  79      char *argv[])
  80 {                               /* I - Command-line arguments */
  81         int             i;      /* Looping var */
  82         int             copies; /* Number of copies */
  83         int             port;   /* Port number */
  84         char            uri[1024],      /* URI */
  85                        *sep,    /* Pointer to separator */
  86                        *tmp, *tmp2,     /* Temp pointers to do escaping */
  87                        *password;       /* Password */
  88         char           *username,       /* Username */
  89                        *server, /* Server name */
  90                        *printer;/* Printer name */
  91         const char     *workgroup;      /* Workgroup */
  92         FILE           *fp;     /* File to print */
  93         int             status = 1;     /* Status of LPD job */
  94         struct cli_state *cli;  /* SMB interface */
  95         char            null_str[1];
  96         int             tries = 0;
  97         bool            need_auth = true;
  98         const char     *dev_uri;
  99         TALLOC_CTX     *frame = talloc_stackframe();
 100
 101         null_str[0] = '\0';
 102
 103         /*
 104          * we expect the URI in argv[0]. Detect the case where it is in
 105          * argv[1] and cope
 106          */
 107         if (argc > 2 && strncmp(argv[0], "smb://", 6) &&
 108             strncmp(argv[1], "smb://", 6) == 0) {
 109                 argv++;
 110                 argc--;
 111         }
 112
 113         if (argc == 1) {
 114                 /*
 115                  * NEW!  In CUPS 1.1 the backends are run with no arguments
 116                  * to list the available devices.  These can be devices
 117                  * served by this backend or any other backends (i.e. you
 118                  * can have an SNMP backend that is only used to enumerate
 119                  * the available network printers... :)
 120                  */
 121
 122                 list_devices();
 123                 status = 0;
 124                 goto done;
 125         }
 126
 127         if (argc < 6 || argc > 7) {
 128                 fprintf(stderr,
 129 "Usage: %s [DEVICE_URI] job-id user title copies options [file]\n"
 130 "       The DEVICE_URI environment variable can also contain the\n"
 131 "       destination printer:\n"
 132 "\n"
 133 "           smb://[username:password@][workgroup/]server[:port]/printer\n",
 134                         argv[0]);
 135                 goto done;
 136         }
 137
 138         /*
 139          * If we have 7 arguments, print the file named on the command-line.
 140          * Otherwise, print data from stdin...
 141          */
 142
 143         if (argc == 6) {
 144                 /*
 145                  * Print from Copy stdin to a temporary file...
 146                  */
 147
 148                 fp = stdin;
 149                 copies = 1;
 150         } else if ((fp = fopen(argv[6], "rb")) == NULL) {
 151                 perror("ERROR: Unable to open print file");
 152                 goto done;
 153         } else {
 154                 copies = atoi(argv[4]);
 155         }
 156
 157         /*
 158          * Find the URI...
 159          */
 160
 161         dev_uri = getenv("DEVICE_URI");
 162         if (dev_uri) {
 163                 strncpy(uri, dev_uri, sizeof(uri) - 1);
 164         } else if (strncmp(argv[0], "smb://", 6) == 0) {
 165                 strncpy(uri, argv[0], sizeof(uri) - 1);
 166         } else {
 167                 fputs("ERROR: No device URI found in DEVICE_URI environment variable or argv[0] !\n", stderr);
 168                 goto done;
 169         }
 170
 171         uri[sizeof(uri) - 1] = '\0';
 172
 173         /*
 174          * Extract the destination from the URI...
 175          */
 176
 177         if ((sep = strrchr_m(uri, '@')) != NULL) {
 178                 tmp = uri + 6;
 179                 *sep++ = '\0';
 180
 181                 /* username is in tmp */
 182
 183                 server = sep;
 184
 185                 /*
 186                  * Extract password as needed...
 187                  */
 188
 189                 if ((tmp2 = strchr_m(tmp, ':')) != NULL) {
 190                         *tmp2++ = '\0';
 191                         password = uri_unescape_alloc(tmp2);
 192                 } else {
 193                         password = null_str;
 194                 }
 195                 username = uri_unescape_alloc(tmp);
 196         } else {
 197                 if ((username = getenv("AUTH_USERNAME")) == NULL) {
 198                         username = null_str;
 199                 }
 200
 201                 if ((password = getenv("AUTH_PASSWORD")) == NULL) {
 202                         password = null_str;
 203                 }
 204
 205                 server = uri + 6;
 206         }
 207
 208         tmp = server;
 209
 210         if ((sep = strchr_m(tmp, '/')) == NULL) {
 211                 fputs("ERROR: Bad URI - need printer name!\n", stderr);
 212                 goto done;
 213         }
 214
 215         *sep++ = '\0';
 216         tmp2 = sep;
 217
 218         if ((sep = strchr_m(tmp2, '/')) != NULL) {
 219                 /*
 220                  * Convert to smb://[username:password@]workgroup/server/printer...
 221                  */
 222
 223                 *sep++ = '\0';
 224
 225                 workgroup = uri_unescape_alloc(tmp);
 226                 server = uri_unescape_alloc(tmp2);
 227                 printer = uri_unescape_alloc(sep);
 228         } else {
 229                 workgroup = NULL;
 230                 server = uri_unescape_alloc(tmp);
 231                 printer = uri_unescape_alloc(tmp2);
 232         }
 233
 234         if ((sep = strrchr_m(server, ':')) != NULL) {
 235                 *sep++ = '\0';
 236
 237                 port = atoi(sep);
 238         } else {
 239                 port = 0;
 240         }
 241
 242         /*
 243          * Setup the SAMBA server state...
 244          */
 245
 246         setup_logging("smbspool", DEBUG_STDOUT);
 247
 248         lp_set_in_client(True); /* Make sure that we tell lp_load we are */
 249
 250         load_case_tables();
 251
 252         if (!lp_load(get_dyn_CONFIGFILE(), True, False, False, True)) {
 253                 fprintf(stderr, "ERROR: Can't load %s - run testparm to debug it\n", get_dyn_CONFIGFILE());
 254                 goto done;
 255         }
 256
 257         if (workgroup == NULL) {
 258                 workgroup = lp_workgroup();
 259         }
 260
 261         load_interfaces();
 262
 263         do {
 264                 cli = smb_connect(workgroup, server, port, printer,
 265                         username, password, argv[2], &need_auth);
 266                 if (cli == NULL) {
 267                         if (need_auth) {
 268                                 exit(2);
 269                         } else if (getenv("CLASS") == NULL) {
 270                                 fprintf(stderr, "ERROR: Unable to connect to CIFS host, will retry in 60 seconds...\n");
 271                                 sleep(60);
 272                                 tries++;
 273                         } else {
 274                                 fprintf(stderr, "ERROR: Unable to connect to CIFS host, trying next printer...\n");
 275                                 goto done;
 276                         }
 277                 }
 278         } while ((cli == NULL) && (tries < MAX_RETRY_CONNECT));
 279
 280         if (cli == NULL) {
 281                 fprintf(stderr, "ERROR: Unable to connect to CIFS host after (tried %d times)\n", tries);
 282                 goto done;
 283         }
 284
 285         /*
 286          * Now that we are connected to the server, ignore SIGTERM so that we
 287          * can finish out any page data the driver sends (e.g. to eject the
 288          * current page...  Only ignore SIGTERM if we are printing data from
 289          * stdin (otherwise you can't cancel raw jobs...)
 290          */
 291
 292         if (argc < 7) {
 293                 CatchSignal(SIGTERM, SIG_IGN);
 294         }
 295
 296         /*
 297          * Queue the job...
 298          */
 299
 300         for (i = 0; i < copies; i++) {
 301                 status = smb_print(cli, argv[3] /* title */ , fp);
 302                 if (status != 0) {
 303                         break;
 304                 }
 305         }
 306
 307         cli_shutdown(cli);
 308
 309         /*
 310          * Return the queue status...
 311          */
 312
 313 done:
 314
 315         TALLOC_FREE(frame);
 316         return (status);
 317 }
 318
 319
 320 /*
 321  * 'get_exit_code()' - Get the backend exit code based on the current error.
 322  */
 323
 324 static int
 325 get_exit_code(struct cli_state * cli,
 326               NTSTATUS nt_status)
 327 {
 328         int i;
 329
 330         /* List of NTSTATUS errors that are considered
 331          * authentication errors
 332          */
 333         static const NTSTATUS auth_errors[] =
 334         {
 335                 NT_STATUS_ACCESS_DENIED, NT_STATUS_ACCESS_VIOLATION,
 336                 NT_STATUS_SHARING_VIOLATION, NT_STATUS_PRIVILEGE_NOT_HELD,
 337                 NT_STATUS_INVALID_ACCOUNT_NAME, NT_STATUS_NO_SUCH_USER,
 338                 NT_STATUS_WRONG_PASSWORD, NT_STATUS_LOGON_FAILURE,
 339                 NT_STATUS_ACCOUNT_RESTRICTION, NT_STATUS_INVALID_LOGON_HOURS,
 340                 NT_STATUS_PASSWORD_EXPIRED, NT_STATUS_ACCOUNT_DISABLED
 341         };
 342
 343
 344         fprintf(stderr, "DEBUG: get_exit_code(cli=%p, nt_status=%x)\n",
 345                 cli, NT_STATUS_V(nt_status));
 346
 347         for (i = 0; i < ARRAY_SIZE(auth_errors); i++) {
 348                 if (!NT_STATUS_EQUAL(nt_status, auth_errors[i])) {
 349                         continue;
 350                 }
 351
 352                 if (cli) {
 353                         if (cli->use_kerberos && cli->got_kerberos_mechanism)
 354                                 fputs("ATTR: auth-info-required=negotiate\n", stderr);
 355                         else
 356                                 fputs("ATTR: auth-info-required=username,password\n", stderr);
 357                 }
 358
 359                 /*
 360                  * 2 = authentication required...
 361                  */
 362
 363                 return (2);
 364
 365         }
 366
 367         /*
 368          * 1 = fail
 369          */
 370
 371         return (1);
 372 }
 373
 374
 375 /*
 376  * 'list_devices()' - List the available printers seen on the network...
 377  */
 378
 379 static void
 380 list_devices(void)
 381 {
 382         /*
 383          * Eventually, search the local workgroup for available hosts and printers.
 384          */
 385
 386         puts("network smb \"Unknown\" \"Windows Printer via SAMBA\"");
 387 }
 388
 389
 390 static struct cli_state *
 391 smb_complete_connection(const char *myname,
 392                         const char *server,
 393                         int port,
 394                         const char *username,
 395                         const char *password,
 396                         const char *workgroup,
 397                         const char *share,
 398                         int flags,
 399                         bool *need_auth)
 400 {
 401         struct cli_state *cli;  /* New connection */
 402         NTSTATUS        nt_status;
 403
 404         /* Start the SMB connection */
 405         *need_auth = false;
 406         nt_status = cli_start_connection(&cli, myname, server, NULL, port,
 407                                          Undefined, flags);
 408         if (!NT_STATUS_IS_OK(nt_status)) {
 409                 fprintf(stderr, "ERROR: Connection failed: %s\n", nt_errstr(nt_status));
 410                 return NULL;
 411         }
 412
 413         /*
 414          * We pretty much guarantee password must be valid or a pointer to a
 415          * 0 char.
 416          */
 417         if (!password) {
 418                 *need_auth = true;
 419                 return NULL;
 420         }
 421
 422         nt_status = cli_session_setup(cli, username,
 423                                       password, strlen(password) + 1,
 424                                       password, strlen(password) + 1,
 425                                       workgroup);
 426         if (!NT_STATUS_IS_OK(nt_status)) {
 427                 fprintf(stderr, "ERROR: Session setup failed: %s\n", nt_errstr(nt_status));
 428
 429                 if (get_exit_code(cli, nt_status) == 2) {
 430                         *need_auth = true;
 431                 }
 432
 433                 cli_shutdown(cli);
 434
 435                 return NULL;
 436         }
 437
 438         nt_status = cli_tcon_andx(cli, share, "?????", password,
 439                                   strlen(password) + 1);
 440         if (!NT_STATUS_IS_OK(nt_status)) {
 441                 fprintf(stderr, "ERROR: Tree connect failed (%s)\n",
 442                         nt_errstr(nt_status));
 443
 444                 if (get_exit_code(cli, nt_status) == 2) {
 445                         *need_auth = true;
 446                 }
 447
 448                 cli_shutdown(cli);
 449
 450                 return NULL;
 451         }
 452 #if 0
 453         /* Need to work out how to specify this on the URL. */
 454         if (smb_encrypt) {
 455                 if (!cli_cm_force_encryption(cli,
 456                                              username,
 457                                              password,
 458                                              workgroup,
 459                                              share)) {
 460                         fprintf(stderr, "ERROR: encryption setup failed\n");
 461                         cli_shutdown(cli);
 462                         return NULL;
 463                 }
 464         }
 465 #endif
 466
 467         return cli;
 468 }
 469
 470 /*
 471  * 'smb_connect()' - Return a connection to a server.
 472  */
 473
 474 static struct cli_state *       /* O - SMB connection */
 475 smb_connect(const char *workgroup,      /* I - Workgroup */
 476             const char *server, /* I - Server */
 477             const int port,     /* I - Port */
 478             const char *share,  /* I - Printer */
 479             const char *username,       /* I - Username */
 480             const char *password,       /* I - Password */
 481             const char *jobusername,    /* I - User who issued the print job */
 482             bool *need_auth)
 483 {                               /* O - Need authentication? */
 484         struct cli_state *cli;  /* New connection */
 485         char           *myname = NULL;  /* Client name */
 486         struct passwd  *pwd;
 487
 488         /*
 489          * Get the names and addresses of the client and server...
 490          */
 491         myname = get_myname(talloc_tos());
 492         if (!myname) {
 493                 return NULL;
 494         }
 495
 496         /*
 497          * See if we have a username first.  This is for backwards compatible
 498          * behavior with 3.0.14a
 499          */
 500
 501         if (username && *username && !getenv("KRB5CCNAME")) {
 502                 cli = smb_complete_connection(myname, server, port, username,
 503                                     password, workgroup, share, 0, need_auth);
 504                 if (cli) {
 505                         fputs("DEBUG: Connected with username/password...\n", stderr);
 506                         return (cli);
 507                 }
 508         }
 509
 510         /*
 511          * Try to use the user kerberos credentials (if any) to authenticate
 512          */
 513         cli = smb_complete_connection(myname, server, port, jobusername, "",
 514                                       workgroup, share,
 515                                  CLI_FULL_CONNECTION_USE_KERBEROS, need_auth);
 516
 517         if (cli) {
 518                 fputs("DEBUG: Connected using Kerberos...\n", stderr);
 519                 return (cli);
 520         }
 521
 522         /* give a chance for a passwordless NTLMSSP session setup */
 523         pwd = getpwuid(geteuid());
 524         if (pwd == NULL) {
 525                 return NULL;
 526         }
 527
 528         cli = smb_complete_connection(myname, server, port, pwd->pw_name, "",
 529                                       workgroup, share, 0, need_auth);
 530
 531         if (cli) {
 532                 fputs("DEBUG: Connected with NTLMSSP...\n", stderr);
 533                 return (cli);
 534         }
 535
 536         /*
 537          * last try. Use anonymous authentication
 538          */
 539
 540         cli = smb_complete_connection(myname, server, port, "", "",
 541                                       workgroup, share, 0, need_auth);
 542         /*
 543          * Return the new connection...
 544          */
 545
 546         return (cli);
 547 }
 548
 549
 550 /*
 551  * 'smb_print()' - Queue a job for printing using the SMB protocol.
 552  */
 553
 554 static int                      /* O - 0 = success, non-0 = failure */
 555 smb_print(struct cli_state * cli,       /* I - SMB connection */
 556           char *title,          /* I - Title/job name */
 557           FILE * fp)
 558 {                               /* I - File to print */
 559         uint16_t             fnum;      /* File number */
 560         int             nbytes, /* Number of bytes read */
 561                         tbytes; /* Total bytes read */
 562         char            buffer[8192],   /* Buffer for copy */
 563                        *ptr;    /* Pointer into title */
 564         NTSTATUS nt_status;
 565
 566
 567         /*
 568          * Sanitize the title...
 569          */
 570
 571         for (ptr = title; *ptr; ptr++) {
 572                 if (!isalnum((int) *ptr) && !isspace((int) *ptr)) {
 573                         *ptr = '_';
 574                 }
 575         }
 576
 577         /*
 578          * Open the printer device...
 579          */
 580
 581         nt_status = cli_open(cli, title, O_RDWR | O_CREAT | O_TRUNC, DENY_NONE,
 582                           &fnum);
 583         if (!NT_STATUS_IS_OK(nt_status)) {
 584                 fprintf(stderr, "ERROR: %s opening remote spool %s\n",
 585                         nt_errstr(nt_status), title);
 586                 return get_exit_code(cli, nt_status);
 587         }
 588
 589         /*
 590          * Copy the file to the printer...
 591          */
 592
 593         if (fp != stdin)
 594                 rewind(fp);
 595
 596         tbytes = 0;
 597
 598         while ((nbytes = fread(buffer, 1, sizeof(buffer), fp)) > 0) {
 599                 NTSTATUS status;
 600
 601                 status = cli_writeall(cli, fnum, 0, (uint8_t *)buffer,
 602                                       tbytes, nbytes, NULL);
 603                 if (!NT_STATUS_IS_OK(status)) {
 604                         int ret = get_exit_code(cli, status);
 605                         fprintf(stderr, "ERROR: Error writing spool: %s\n",
 606                                 nt_errstr(status));
 607                         fprintf(stderr, "DEBUG: Returning status %d...\n",
 608                                 ret);
 609                         cli_close(cli, fnum);
 610
 611                         return (ret);
 612                 }
 613                 tbytes += nbytes;
 614         }
 615
 616         nt_status = cli_close(cli, fnum);
 617         if (!NT_STATUS_IS_OK(nt_status)) {
 618                 fprintf(stderr, "ERROR: %s closing remote spool %s\n",
 619                         nt_errstr(nt_status), title);
 620                 return get_exit_code(cli, nt_status);
 621         } else {
 622                 return (0);
 623         }
 624 }
 625
 626 static char *
 627 uri_unescape_alloc(const char *uritok)
 628 {
 629         char *ret;
 630
 631         ret = (char *) SMB_STRDUP(uritok);
 632         if (!ret) {
 633                 return NULL;
 634         }
 635
 636         rfc1738_unescape(ret);
 637         return ret;
 638 }