Line data    Source code

       1             : /*-------------------------------------------------------------------------
       2             :  *
       3             :  * File and directory permission routines
       4             :  *
       5             :  *
       6             :  * Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
       7             :  * Portions Copyright (c) 1994, Regents of the University of California
       8             :  *
       9             :  * src/common/file_perm.c
      10             :  *
      11             :  *-------------------------------------------------------------------------
      12             :  */
      13             : #include "c.h"
      14             : 
      15             : #include "common/file_perm.h"
      16             : 
      17             : /* Modes for creating directories and files in the data directory */
      18             : int         pg_dir_create_mode = PG_DIR_MODE_OWNER;
      19             : int         pg_file_create_mode = PG_FILE_MODE_OWNER;
      20             : 
      21             : /*
      22             :  * Mode mask to pass to umask().  This is more of a preventative measure since
      23             :  * all file/directory creates should be performed using the create modes above.
      24             :  */
      25             : int         pg_mode_mask = PG_MODE_MASK_OWNER;
      26             : 
      27             : /*
      28             :  * Set create modes and mask to use when writing to PGDATA based on the data
      29             :  * directory mode passed.  If group read/execute are present in the mode, then
      30             :  * create modes and mask will be relaxed to allow group read/execute on all
      31             :  * newly created files and directories.
      32             :  */
      33             : void
      34        3878 : SetDataDirectoryCreatePerm(int dataDirMode)
      35             : {
      36             :     /* If the data directory mode has group access */
      37        3878 :     if ((PG_DIR_MODE_GROUP & dataDirMode) == PG_DIR_MODE_GROUP)
      38             :     {
      39         254 :         pg_dir_create_mode = PG_DIR_MODE_GROUP;
      40         254 :         pg_file_create_mode = PG_FILE_MODE_GROUP;
      41         254 :         pg_mode_mask = PG_MODE_MASK_GROUP;
      42             :     }
      43             :     /* Else use default permissions */
      44             :     else
      45             :     {
      46        3624 :         pg_dir_create_mode = PG_DIR_MODE_OWNER;
      47        3624 :         pg_file_create_mode = PG_FILE_MODE_OWNER;
      48        3624 :         pg_mode_mask = PG_MODE_MASK_OWNER;
      49             :     }
      50        3878 : }
      51             : 
      52             : #ifdef FRONTEND
      53             : 
      54             : /*
      55             :  * Get the create modes and mask to use when writing to PGDATA by examining the
      56             :  * mode of the PGDATA directory and calling SetDataDirectoryCreatePerm().
      57             :  *
      58             :  * Errors are not handled here and should be reported by the application when
      59             :  * false is returned.
      60             :  *
      61             :  * Suppress when on Windows, because there may not be proper support for Unix-y
      62             :  * file permissions.
      63             :  */
      64             : bool
      65        1396 : GetDataDirectoryCreatePerm(const char *dataDir)
      66             : {
      67             : #if !defined(WIN32) && !defined(__CYGWIN__)
      68             :     struct stat statBuf;
      69             : 
      70             :     /*
      71             :      * If an error occurs getting the mode then return false.  The caller is
      72             :      * responsible for generating an error, if appropriate, indicating that we
      73             :      * were unable to access the data directory.
      74             :      */
      75        1396 :     if (stat(dataDir, &statBuf) == -1)
      76           8 :         return false;
      77             : 
      78             :     /* Set permissions */
      79        1388 :     SetDataDirectoryCreatePerm(statBuf.st_mode);
      80        1388 :     return true;
      81             : #else                           /* !defined(WIN32) && !defined(__CYGWIN__) */
      82             :     /*
      83             :      * On Windows, we don't have anything to do here since they don't have
      84             :      * Unix-y permissions.
      85             :      */
      86             :     return true;
      87             : #endif
      88             : }
      89             : 
      90             : 
      91             : #endif                          /* FRONTEND */