source3/printing/printspoolss.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Printing routines that bridge to spoolss
   4    Copyright (C) Simo Sorce 2010
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21 #include "printing.h"
  22 #include "rpc_client/rpc_client.h"
  23 #include "../librpc/gen_ndr/ndr_spoolss_c.h"
  24 #include "rpc_server/rpc_ncacn_np.h"
  25 #include "smbd/globals.h"
  26 #include "../libcli/security/security.h"
  27
  28 struct print_file_data {
  29         char *svcname;
  30         char *docname;
  31         char *filename;
  32         struct policy_handle handle;
  33         uint32_t jobid;
  34         uint16 rap_jobid;
  35 };
  36
  37 uint16_t print_spool_rap_jobid(struct print_file_data *print_file)
  38 {
  39         if (print_file == NULL) {
  40                 return 0;
  41         }
  42
  43         return print_file->rap_jobid;
  44 }
  45
  46 void print_spool_terminate(struct connection_struct *conn,
  47                            struct print_file_data *print_file);
  48
  49 /***************************************************************************
  50  * Open a Document over spoolss
  51  ***************************************************************************/
  52
  53 #define DOCNAME_DEFAULT "Remote Downlevel Document"
  54 #ifndef PRINT_SPOOL_PREFIX
  55 #define PRINT_SPOOL_PREFIX "smbprn."
  56 #endif
  57
  58 NTSTATUS print_spool_open(files_struct *fsp,
  59                           const char *fname,
  60                           uint64_t current_vuid)
  61 {
  62         NTSTATUS status;
  63         TALLOC_CTX *tmp_ctx;
  64         struct print_file_data *pf;
  65         struct dcerpc_binding_handle *b = NULL;
  66         struct spoolss_DevmodeContainer devmode_ctr;
  67         union spoolss_DocumentInfo info;
  68         int fd = -1;
  69         WERROR werr;
  70
  71         tmp_ctx = talloc_new(fsp);
  72         if (!tmp_ctx) {
  73                 return NT_STATUS_NO_MEMORY;
  74         }
  75
  76         pf = talloc_zero(fsp, struct print_file_data);
  77         if (!pf) {
  78                 status = NT_STATUS_NO_MEMORY;
  79                 goto done;
  80         }
  81         pf->svcname = talloc_strdup(pf, lp_servicename(SNUM(fsp->conn)));
  82
  83         /* the document name is derived from the file name.
  84          * "Remote Downlevel Document" is added in front to
  85          * mimic what windows does in this case */
  86         pf->docname = talloc_strdup(pf, DOCNAME_DEFAULT);
  87         if (!pf->docname) {
  88                 status = NT_STATUS_NO_MEMORY;
  89                 goto done;
  90         }
  91         if (fname) {
  92                 const char *p = strrchr(fname, '/');
  93                 if (!p) {
  94                         p = fname;
  95                 }
  96                 pf->docname = talloc_asprintf_append(pf->docname, " %s", p);
  97                 if (!pf->docname) {
  98                         status = NT_STATUS_NO_MEMORY;
  99                         goto done;
 100                 }
 101         }
 102
 103         /*
 104          * Ok, now we have to open an actual file.
 105          * Here is the reason:
 106          * We want to write the spool job to this file in
 107          * smbd for scalability reason (and also because
 108          * apparently window printer drivers can seek when
 109          * spooling to a file).
 110          * So we first create a file, and then we pass it
 111          * to spoolss in output_file so it can monitor and
 112          * take over once we call EndDocPrinter().
 113          * Of course we will not start writing until
 114          * StartDocPrinter() actually gives the ok.
 115          * smbd spooler files do not include a print jobid
 116          * path component, as the jobid is only known after
 117          * calling StartDocPrinter().
 118          */
 119
 120         pf->filename = talloc_asprintf(pf, "%s/%sXXXXXX",
 121                                         lp_pathname(SNUM(fsp->conn)),
 122                                         PRINT_SPOOL_PREFIX);
 123         if (!pf->filename) {
 124                 status = NT_STATUS_NO_MEMORY;
 125                 goto done;
 126         }
 127         errno = 0;
 128         fd = mkstemp(pf->filename);
 129         if (fd == -1) {
 130                 if (errno == EACCES) {
 131                         /* Common setup error, force a report. */
 132                         DEBUG(0, ("Insufficient permissions "
 133                                   "to open spool file %s.\n",
 134                                   pf->filename));
 135                 } else {
 136                         /* Normal case, report at level 3 and above. */
 137                         DEBUG(3, ("can't open spool file %s,\n",
 138                                   pf->filename));
 139                         DEBUGADD(3, ("errno = %d (%s).\n",
 140                                      errno, strerror(errno)));
 141                 }
 142                 status = map_nt_error_from_unix(errno);
 143                 goto done;
 144         }
 145
 146         /* now open a document over spoolss so that it does
 147          * all printer verification, and eventually assigns
 148          * a job id */
 149
 150         status = rpc_pipe_open_interface(fsp->conn,
 151                                          &ndr_table_spoolss.syntax_id,
 152                                          fsp->conn->session_info,
 153                                          fsp->conn->sconn->remote_address,
 154                                          fsp->conn->sconn->msg_ctx,
 155                                          &fsp->conn->spoolss_pipe);
 156         if (!NT_STATUS_IS_OK(status)) {
 157                 goto done;
 158         }
 159         b = fsp->conn->spoolss_pipe->binding_handle;
 160
 161         ZERO_STRUCT(devmode_ctr);
 162
 163         status = dcerpc_spoolss_OpenPrinter(b, pf, pf->svcname,
 164                                             "RAW", devmode_ctr,
 165                                             SEC_FLAG_MAXIMUM_ALLOWED,
 166                                             &pf->handle, &werr);
 167         if (!NT_STATUS_IS_OK(status)) {
 168                 goto done;
 169         }
 170         if (!W_ERROR_IS_OK(werr)) {
 171                 status = werror_to_ntstatus(werr);
 172                 goto done;
 173         }
 174
 175         info.info1 = talloc(tmp_ctx, struct spoolss_DocumentInfo1);
 176         if (!info.info1) {
 177                 status = NT_STATUS_NO_MEMORY;
 178                 goto done;
 179         }
 180         info.info1->document_name = pf->docname;
 181         info.info1->output_file = pf->filename;
 182         info.info1->datatype = "RAW";
 183
 184         status = dcerpc_spoolss_StartDocPrinter(b, tmp_ctx, &pf->handle,
 185                                                 1, info, &pf->jobid, &werr);
 186         if (!NT_STATUS_IS_OK(status)) {
 187                 goto done;
 188         }
 189         if (!W_ERROR_IS_OK(werr)) {
 190                 status = werror_to_ntstatus(werr);
 191                 goto done;
 192         }
 193
 194         /* Convert to RAP id. */
 195         pf->rap_jobid = pjobid_to_rap(pf->svcname, pf->jobid);
 196         if (pf->rap_jobid == 0) {
 197                 /* No errno around here */
 198                 status = NT_STATUS_ACCESS_DENIED;
 199                 goto done;
 200         }
 201
 202         /* setup a full fsp */
 203         status = create_synthetic_smb_fname(fsp, pf->filename, NULL,
 204                                             NULL, &fsp->fsp_name);
 205         if (!NT_STATUS_IS_OK(status)) {
 206                 goto done;
 207         }
 208
 209         if (sys_fstat(fd, &fsp->fsp_name->st, false) != 0) {
 210                 status = map_nt_error_from_unix(errno);
 211                 goto done;
 212         }
 213
 214         fsp->file_id = vfs_file_id_from_sbuf(fsp->conn, &fsp->fsp_name->st);
 215         fsp->fh->fd = fd;
 216
 217         fsp->vuid = current_vuid;
 218         fsp->can_lock = false;
 219         fsp->can_read = false;
 220         fsp->access_mask = FILE_GENERIC_WRITE;
 221         fsp->can_write = true;
 222         fsp->modified = false;
 223         fsp->oplock_type = NO_OPLOCK;
 224         fsp->sent_oplock_break = NO_BREAK_SENT;
 225         fsp->is_directory = false;
 226
 227         fsp->print_file = pf;
 228
 229         status = NT_STATUS_OK;
 230 done:
 231         if (!NT_STATUS_IS_OK(status)) {
 232                 if (fd != -1) {
 233                         close(fd);
 234                         if (fsp->print_file) {
 235                                 unlink(fsp->print_file->filename);
 236                         }
 237                 }
 238                 /* We need to delete the job from spoolss too */
 239                 if (pf->jobid) {
 240                         print_spool_terminate(fsp->conn, pf);
 241                 }
 242         }
 243         talloc_free(tmp_ctx);
 244         return status;
 245 }
 246
 247 int print_spool_write(files_struct *fsp,
 248                       const char *data, uint32_t size,
 249                       off_t offset, uint32_t *written)
 250 {
 251         SMB_STRUCT_STAT st;
 252         ssize_t n;
 253         int ret;
 254
 255         *written = 0;
 256
 257         /* first of all stat file to find out if it is still there.
 258          * spoolss may have deleted it to signal someone has killed
 259          * the job through it's interface */
 260
 261         if (sys_fstat(fsp->fh->fd, &st, false) != 0) {
 262                 ret = errno;
 263                 DEBUG(3, ("printfile_offset: sys_fstat failed on %s (%s)\n",
 264                           fsp_str_dbg(fsp), strerror(ret)));
 265                 return ret;
 266         }
 267
 268         /* check if the file is unlinked, this will signal spoolss has
 269          * killed it, just return an error and close the file */
 270         if (st.st_ex_nlink == 0) {
 271                 close(fsp->fh->fd);
 272                 return EBADF;
 273         }
 274
 275         /* When print files go beyond 4GB, the 32-bit offset sent in
 276          * old SMBwrite calls is relative to the current 4GB chunk
 277          * we're writing to.
 278          *    Discovered by Sebastian Kloska <oncaphillis@snafu.de>.
 279          */
 280         if (offset < 0xffffffff00000000LL) {
 281                 offset = (st.st_ex_size & 0xffffffff00000000LL) + offset;
 282         }
 283
 284         n = write_data_at_offset(fsp->fh->fd, data, size, offset);
 285         if (n == -1) {
 286                 ret = errno;
 287                 print_spool_terminate(fsp->conn, fsp->print_file);
 288         } else {
 289                 *written = n;
 290                 ret = 0;
 291         }
 292
 293         return ret;
 294 }
 295
 296 void print_spool_end(files_struct *fsp, enum file_close_type close_type)
 297 {
 298         NTSTATUS status;
 299         WERROR werr;
 300         struct dcerpc_binding_handle *b = NULL;
 301
 302         b = fsp->conn->spoolss_pipe->binding_handle;
 303
 304         switch (close_type) {
 305         case NORMAL_CLOSE:
 306         case SHUTDOWN_CLOSE:
 307                 /* this also automatically calls spoolss_EndDocPrinter */
 308                 status = dcerpc_spoolss_ClosePrinter(b, fsp->print_file,
 309                                                 &fsp->print_file->handle,
 310                                                 &werr);
 311                 if (!NT_STATUS_IS_OK(status) ||
 312                     !NT_STATUS_IS_OK(status = werror_to_ntstatus(werr))) {
 313                         DEBUG(3, ("Failed to close printer %s [%s]\n",
 314                               fsp->print_file->svcname, nt_errstr(status)));
 315                 }
 316                 break;
 317         case ERROR_CLOSE:
 318                 print_spool_terminate(fsp->conn, fsp->print_file);
 319                 break;
 320         }
 321 }
 322
 323
 324 void print_spool_terminate(struct connection_struct *conn,
 325                            struct print_file_data *print_file)
 326 {
 327         NTSTATUS status;
 328         WERROR werr;
 329         struct dcerpc_binding_handle *b = NULL;
 330
 331         rap_jobid_delete(print_file->svcname, print_file->jobid);
 332
 333         status = rpc_pipe_open_interface(conn,
 334                                          &ndr_table_spoolss.syntax_id,
 335                                          conn->session_info,
 336                                          conn->sconn->remote_address,
 337                                          conn->sconn->msg_ctx,
 338                                          &conn->spoolss_pipe);
 339         if (!NT_STATUS_IS_OK(status)) {
 340                 DEBUG(0, ("print_spool_terminate: "
 341                           "Failed to get spoolss pipe [%s]\n",
 342                           nt_errstr(status)));
 343                 return;
 344         }
 345         b = conn->spoolss_pipe->binding_handle;
 346
 347         status = dcerpc_spoolss_SetJob(b, print_file,
 348                                         &print_file->handle,
 349                                         print_file->jobid,
 350                                         NULL, SPOOLSS_JOB_CONTROL_DELETE,
 351                                         &werr);
 352         if (!NT_STATUS_IS_OK(status) ||
 353             !NT_STATUS_IS_OK(status = werror_to_ntstatus(werr))) {
 354                 DEBUG(3, ("Failed to delete job %d [%s]\n",
 355                           print_file->jobid, nt_errstr(status)));
 356                 return;
 357         }
 358         status = dcerpc_spoolss_ClosePrinter(b, print_file,
 359                                              &print_file->handle,
 360                                              &werr);
 361         if (!NT_STATUS_IS_OK(status) ||
 362             !NT_STATUS_IS_OK(status = werror_to_ntstatus(werr))) {
 363                 DEBUG(3, ("Failed to close printer %s [%s]\n",
 364                           print_file->svcname, nt_errstr(status)));
 365                 return;
 366         }
 367 }