TLA  Line data    Source code

       1                 : /*-------------------------------------------------------------------------
       2                 :  *
       3                 :  * File and directory permission routines
       4                 :  *
       5                 :  *
       6                 :  * Portions Copyright (c) 1996-2023, 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 CBC        3323 : SetDataDirectoryCreatePerm(int dataDirMode)
      35                 : {
      36                 :     /* If the data directory mode has group access */
      37            3323 :     if ((PG_DIR_MODE_GROUP & dataDirMode) == PG_DIR_MODE_GROUP)
      38                 :     {
      39             156 :         pg_dir_create_mode = PG_DIR_MODE_GROUP;
      40             156 :         pg_file_create_mode = PG_FILE_MODE_GROUP;
      41             156 :         pg_mode_mask = PG_MODE_MASK_GROUP;
      42                 :     }
      43                 :     /* Else use default permissions */
      44                 :     else
      45                 :     {
      46            3167 :         pg_dir_create_mode = PG_DIR_MODE_OWNER;
      47            3167 :         pg_file_create_mode = PG_FILE_MODE_OWNER;
      48            3167 :         pg_mode_mask = PG_MODE_MASK_OWNER;
      49                 :     }
      50            3323 : }
      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            1195 : 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            1195 :     if (stat(dataDir, &statBuf) == -1)
      76               4 :         return false;
      77                 : 
      78                 :     /* Set permissions */
      79            1191 :     SetDataDirectoryCreatePerm(statBuf.st_mode);
      80            1191 :     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 */