From 2764d5dcfa84d240c901c20ec6e194f72d82b78a Mon Sep 17 00:00:00 2001
From: Peter Eisentraut <peter_e@gmx.net>
Date: Mon, 2 Apr 2018 11:34:52 -0400
Subject: Make be-secure-common.c more consistent for future SSL
 implementations

Recent commit 8a3d9425 has introduced be-secure-common.c, which is aimed
at including backend-side APIs that can be used by any SSL
implementation.  The purpose is similar to fe-secure-common.c for the
frontend-side APIs.

However, this has forgotten to include check_ssl_key_file_permissions()
in the move, which causes a double dependency between be-secure.c and
be-secure-openssl.c.

Refactor the code in a more logical way.  This also puts into light an
API which is usable by future SSL implementations for permissions on SSL
key files.

Author: Michael Paquier <michael@paquier.xyz>
---
 src/backend/libpq/be-secure.c | 69 -------------------------------------------
 1 file changed, 69 deletions(-)

(limited to 'src/backend/libpq/be-secure.c')

diff --git a/src/backend/libpq/be-secure.c b/src/backend/libpq/be-secure.c
index fb1f6b5bbe7..edfe2c0751c 100644
--- a/src/backend/libpq/be-secure.c
+++ b/src/backend/libpq/be-secure.c
@@ -18,12 +18,10 @@
 
 #include "postgres.h"
 
-#include <sys/stat.h>
 #include <signal.h>
 #include <fcntl.h>
 #include <ctype.h>
 #include <sys/socket.h>
-#include <unistd.h>
 #include <netdb.h>
 #include <netinet/in.h>
 #ifdef HAVE_NETINET_TCP_H
@@ -320,70 +318,3 @@ secure_raw_write(Port *port, const void *ptr, size_t len)
 
 	return n;
 }
-
-bool
-check_ssl_key_file_permissions(const char *ssl_key_file, bool isServerStart)
-{
-	int			loglevel = isServerStart ? FATAL : LOG;
-	struct stat	buf;
-
-	if (stat(ssl_key_file, &buf) != 0)
-	{
-		ereport(loglevel,
-				(errcode_for_file_access(),
-				 errmsg("could not access private key file \"%s\": %m",
-						ssl_key_file)));
-		return false;
-	}
-
-	if (!S_ISREG(buf.st_mode))
-	{
-		ereport(loglevel,
-				(errcode(ERRCODE_CONFIG_FILE_ERROR),
-				 errmsg("private key file \"%s\" is not a regular file",
-						ssl_key_file)));
-		return false;
-	}
-
-	/*
-	 * Refuse to load key files owned by users other than us or root.
-	 *
-	 * XXX surely we can check this on Windows somehow, too.
-	 */
-#if !defined(WIN32) && !defined(__CYGWIN__)
-	if (buf.st_uid != geteuid() && buf.st_uid != 0)
-	{
-		ereport(loglevel,
-				(errcode(ERRCODE_CONFIG_FILE_ERROR),
-				 errmsg("private key file \"%s\" must be owned by the database user or root",
-						ssl_key_file)));
-		return false;
-	}
-#endif
-
-	/*
-	 * Require no public access to key file. If the file is owned by us,
-	 * require mode 0600 or less. If owned by root, require 0640 or less to
-	 * allow read access through our gid, or a supplementary gid that allows
-	 * to read system-wide certificates.
-	 *
-	 * XXX temporarily suppress check when on Windows, because there may not
-	 * be proper support for Unix-y file permissions.  Need to think of a
-	 * reasonable check to apply on Windows.  (See also the data directory
-	 * permission check in postmaster.c)
-	 */
-#if !defined(WIN32) && !defined(__CYGWIN__)
-	if ((buf.st_uid == geteuid() && buf.st_mode & (S_IRWXG | S_IRWXO)) ||
-		(buf.st_uid == 0 && buf.st_mode & (S_IWGRP | S_IXGRP | S_IRWXO)))
-	{
-		ereport(loglevel,
-				(errcode(ERRCODE_CONFIG_FILE_ERROR),
-				 errmsg("private key file \"%s\" has group or world access",
-						ssl_key_file),
-				 errdetail("File must have permissions u=rw (0600) or less if owned by the database user, or permissions u=rw,g=r (0640) or less if owned by root.")));
-		return false;
-	}
-#endif
-
-	return true;
-}
-- 
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