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- djm@cvs.openbsd.org 2008/06/13 04:40:22 

[auth2-pubkey.c auth-rhosts.c]
     refuse to read ~/.shosts or ~/.ssh/authorized_keys that are not
     regular files; report from Solar Designer via Colin Watson in bz#1471
     ok dtucker@ deraadt@
This commit is contained in:
Darren Tucker 2008-06-13 14:51:28 +10:00
parent 7517b5bd31
commit 06db584e9d
3 changed files with 50 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
ChangeLog
View File

@ -157,6 +157,11 @@
- dtucker@cvs.openbsd.org 2008/06/13 01:38:23
[misc.c]
upcast uid to long with matching %ld, prevents warnings in portable
- djm@cvs.openbsd.org 2008/06/13 04:40:22
[auth2-pubkey.c auth-rhosts.c]
refuse to read ~/.shosts or ~/.ssh/authorized_keys that are not
regular files; report from Solar Designer via Colin Watson in bz#1471
ok dtucker@ deraadt
- (dtucker) [clientloop.c serverloop.c] channel_register_filter now
takes 2 more args. with djm@
- (dtucker) [defines.h] Bug #1112: __dead is, well dead. Based on a patch
@ -4328,4 +4333,4 @@
OpenServer 6 and add osr5bigcrypt support so when someone migrates
passwords between UnixWare and OpenServer they will still work. OK dtucker@
$Id: ChangeLog,v 1.5001 2008/06/13 04:48:59 dtucker Exp $
$Id: ChangeLog,v 1.5002 2008/06/13 04:51:28 dtucker Exp $

25
auth-rhosts.c
View File

@ -1,4 +1,4 @@
/* $OpenBSD: auth-rhosts.c,v 1.41 2006/08/03 03:34:41 deraadt Exp $ */
/* $OpenBSD: auth-rhosts.c,v 1.42 2008/06/13 04:40:22 djm Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@ -26,6 +26,7 @@
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include <fcntl.h>
#include "packet.h"
#include "buffer.h"
@ -37,6 +38,7 @@
#include "key.h"
#include "hostfile.h"
#include "auth.h"
#include "misc.h"
/* import */
extern ServerOptions options;
@ -55,12 +57,27 @@ check_rhosts_file(const char *filename, const char *hostname,
{
FILE *f;
char buf[1024]; /* Must not be larger than host, user, dummy below. */
int fd;
struct stat st;
/* Open the .rhosts file, deny if unreadable */
f = fopen(filename, "r");
if (!f)
if ((fd = open(filename, O_RDONLY|O_NONBLOCK)) == -1)
return 0;
if (fstat(fd, &st) == -1) {
close(fd);
return 0;
}
if (!S_ISREG(st.st_mode)) {
logit("User %s hosts file %s is not a regular file",
server_user, filename);
close(fd);
return 0;
}
unset_nonblock(fd);
if ((f = fdopen(fd, "r")) == NULL) {
close(fd);
return 0;
}
while (fgets(buf, sizeof(buf), f)) {
/* All three must be at least as big as buf to avoid overflows. */
char hostbuf[1024], userbuf[1024], dummy[1024], *host, *user, *cp;

32
auth2-pubkey.c
View File

@ -1,4 +1,4 @@
/* $OpenBSD: auth2-pubkey.c,v 1.15 2006/08/03 03:34:41 deraadt Exp $ */
/* $OpenBSD: auth2-pubkey.c,v 1.16 2008/06/13 04:40:22 djm Exp $ */
/*
* Copyright (c) 2000 Markus Friedl. All rights reserved.
*
@ -28,6 +28,7 @@
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <pwd.h>
#include <stdio.h>
#include <stdarg.h>
@ -180,7 +181,7 @@ static int
user_key_allowed2(struct passwd *pw, Key *key, char *file)
{
char line[SSH_MAX_PUBKEY_BYTES];
int found_key = 0;
int found_key = 0, fd;
FILE *f;
u_long linenum = 0;
struct stat st;
@ -192,16 +193,29 @@ user_key_allowed2(struct passwd *pw, Key *key, char *file)
debug("trying public key file %s", file);
/* Fail quietly if file does not exist */
if (stat(file, &st) < 0) {
/* Restore the privileged uid. */
/*
* Open the file containing the authorized keys
* Fail quietly if file does not exist
*/
if ((fd = open(file, O_RDONLY|O_NONBLOCK)) == -1) {
restore_uid();
return 0;
}
/* Open the file containing the authorized keys. */
f = fopen(file, "r");
if (!f) {
/* Restore the privileged uid. */
if (fstat(fd, &st) < 0) {
close(fd);
restore_uid();
return 0;
}
if (!S_ISREG(st.st_mode)) {
logit("User %s authorized keys %s is not a regular file",
pw->pw_name, file);
close(fd);
restore_uid();
return 0;
}
unset_nonblock(fd);
if ((f = fdopen(fd, "r")) == NULL) {
close(fd);
restore_uid();
return 0;
}