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Refactor dir/file permissions

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Consolidate directory and file create permissions for tools which work
with the PG data directory by adding a new module (common/file_perm.c)
that contains variables (pg_file_create_mode, pg_dir_create_mode) and
constants to initialize them (0600 for files and 0700 for directories).

Convert mkdir() calls in the backend to MakePGDirectory() if the
original call used default permissions (always the case for regular PG
directories).

Add tests to make sure permissions in PGDATA are set correctly by the
tools which modify the PG data directory.

Authors: David Steele <david@pgmasters.net>,
         Adam Brightwell <adam.brightwell@crunchydata.com>
Reviewed-By: Michael Paquier, with discussion amongst many others.
Discussion: https://postgr.es/m/ad346fe6-b23e-59f1-ecb7-0e08390ad629%40pgmasters.net
This commit is contained in:
Stephen Frost
2018-04-07 17:45:39 -04:00
parent 499be013de
commit da9b580d89
34 changed files with 330 additions and 75 deletions
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5
src/backend/utils/init/miscinit.c
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@ -32,6 +32,7 @@
#include "access/htup_details.h"
#include "catalog/pg_authid.h"
#include "common/file_perm.h"
#include "libpq/libpq.h"
#include "mb/pg_wchar.h"
#include "miscadmin.h"
@ -831,7 +832,7 @@ CreateLockFile(const char *filename, bool amPostmaster,
* Think not to make the file protection weaker than 0600. See
* comments below.
*/
fd = open(filename, O_RDWR | O_CREAT | O_EXCL, 0600);
fd = open(filename, O_RDWR | O_CREAT | O_EXCL, pg_file_create_mode);
if (fd >= 0)
break; /* Success; exit the retry loop */
@ -848,7 +849,7 @@ CreateLockFile(const char *filename, bool amPostmaster,
* Read the file to get the old owner's PID. Note race condition
* here: file might have been deleted since we tried to create it.
*/
fd = open(filename, O_RDONLY, 0600);
fd = open(filename, O_RDONLY, pg_file_create_mode);
if (fd < 0)
{
if (errno == ENOENT)