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Fix bug in SET SESSION AUTHORIZATION that allows unprivileged users to crash

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the server, if it has been compiled with Asserts enabled (CVE-2006-0553).
Thanks to Akio Ishida for reporting this problem.
This commit is contained in:
Tom Lane 2006-02-12 22:33:29 +00:00
parent 86b2da894a
commit 7ef174c032
4 changed files with 20 additions and 9 deletions
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6
src/backend/commands/variable.c
View File

@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/commands/variable.c,v 1.88.2.2 2005/06/05 01:48:55 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/commands/variable.c,v 1.88.2.3 2006/02/12 22:33:28 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -736,7 +736,9 @@ assign_client_encoding(const char *value, bool doit, bool interactive)
* by the numeric userid, followed by a comma, followed by the user name.
* This cannot be confused with a plain user name because of the NAMEDATALEN
* limit on names, so we can tell whether we're being passed an initial
* username or a saved/restored value.
* username or a saved/restored value. (NOTE: we rely on guc.c to have
* properly truncated any incoming value, but not to truncate already-stored
* values. See GUC_IS_NAME processing.)
*/
extern char *session_authorization_string; /* in guc.c */

4
src/backend/utils/mb/encnames.c
View File

@ -2,7 +2,7 @@
* Encoding names and routines for work with it. All
* in this file is shared bedween FE and BE.
*
* $Id: encnames.c,v 1.17 2003/07/25 20:17:55 tgl Exp $
* $Id: encnames.c,v 1.17.4.1 2006/02/12 22:33:28 tgl Exp $
*/
#ifdef FRONTEND
#include "postgres_fe.h"
@ -434,7 +434,7 @@ pg_char_to_encname_struct(const char *name)
if (name == NULL || *name == '\0')
return NULL;
if (strlen(name) > NAMEDATALEN)
if (strlen(name) >= NAMEDATALEN)
{
#ifdef FRONTEND
fprintf(stderr, "encoding name too long\n");

16
src/backend/utils/misc/guc.c
View File

@ -10,7 +10,7 @@
* Written by Peter Eisentraut <peter_e@gmx.net>.
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/misc/guc.c,v 1.164.2.3 2004/08/11 21:10:52 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/misc/guc.c,v 1.164.2.4 2006/02/12 22:33:28 tgl Exp $
*
*--------------------------------------------------------------------
*/
@ -44,6 +44,7 @@
#include "optimizer/prep.h"
#include "parser/parse_expr.h"
#include "parser/parse_relation.h"
#include "parser/scansup.h"
#include "storage/fd.h"
#include "storage/freespace.h"
#include "storage/lock.h"
@ -1284,7 +1285,7 @@ static struct config_string ConfigureNamesString[] =
{"client_encoding", PGC_USERSET, CLIENT_CONN_LOCALE,
gettext_noop("Sets the client's character set encoding."),
NULL,
GUC_REPORT
GUC_IS_NAME | GUC_REPORT
},
&client_encoding_string,
"SQL_ASCII", assign_client_encoding, NULL
@ -1475,7 +1476,7 @@ static struct config_string ConfigureNamesString[] =
{"server_encoding", PGC_INTERNAL, CLIENT_CONN_LOCALE,
gettext_noop("Sets the server (database) character set encoding."),
NULL,
GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
GUC_IS_NAME | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
},
&server_encoding_string,
"SQL_ASCII", NULL, NULL
@ -1497,7 +1498,7 @@ static struct config_string ConfigureNamesString[] =
{"session_authorization", PGC_USERSET, UNGROUPED,
gettext_noop("Shows the session user name."),
NULL,
GUC_REPORT | GUC_NO_SHOW_ALL | GUC_NO_RESET_ALL | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
GUC_IS_NAME | GUC_REPORT | GUC_NO_SHOW_ALL | GUC_NO_RESET_ALL | GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
},
&session_authorization_string,
NULL, assign_session_authorization, show_session_authorization
@ -2831,6 +2832,13 @@ set_config_option(const char *name, const char *value,
return false;
}
/*
* The only sort of "parsing" check we need to do is
* apply truncation if GUC_IS_NAME.
*/
if (conf->gen.flags & GUC_IS_NAME)
truncate_identifier(newval, strlen(newval), true);
if (record->context == PGC_USERLIMIT &&
*conf->variable)
{

3
src/include/utils/guc_tables.h
View File

@ -7,7 +7,7 @@
*
* Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
*
* $Id: guc_tables.h,v 1.6 2003/08/04 02:40:15 momjian Exp $
* $Id: guc_tables.h,v 1.6.4.1 2006/02/12 22:33:29 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -97,6 +97,7 @@ struct config_generic
#define GUC_REPORT 0x0010 /* auto-report changes to client */
#define GUC_NOT_IN_SAMPLE 0x0020 /* not in postgresql.conf.sample */
#define GUC_DISALLOW_IN_FILE 0x0040 /* can't set in postgresql.conf */
#define GUC_IS_NAME 0x0080 /* limit string to NAMEDATALEN-1 */
/* bit values in status field */
#define GUC_HAVE_TENTATIVE 0x0001 /* tentative value is defined */