Date: Thu, 20 Apr 2000 06:20:04 -0700 (PDT) From: IKEDA Kenji <noroi@mob.or.jp> To: freebsd-bugs@FreeBSD.org Subject: Re: misc/18109: if pw_shell is empty(/bin/sh is assumed), cannot login via ssh. Message-ID: <200004201320.GAA52589@freefall.freebsd.org>
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The following reply was made to PR misc/18109; it has been noted by GNATS.
From: IKEDA Kenji <noroi@mob.or.jp>
To: alex@big.endian.de
Cc: freebsd-gnats-submit@FreeBSD.ORG
Subject: Re: misc/18109: if pw_shell is empty(/bin/sh is assumed), cannot
login via ssh.
Date: Thu, 20 Apr 2000 22:13:24 +0900
On Thu, 20 Apr 2000 13:31:07 +0200, Alexander Langer <alex@big.endian.de> wrote:
> You should add indentation to make your code more readable.
Sorry.
> What will happen if it is == 0 now?
if pw->pw_shell == 0 then ... segmentation violation will happen.
if pw->pw_shell[0] == 0 then ... it means /bin/sh. /bin/sh always valid.
--- sshd.c.~1~ Thu Apr 20 21:37:40 2000
+++ sshd.c Thu Apr 20 21:47:58 2000
@@ -1211,11 +1211,13 @@
if (!pw)
return 0;
- /* deny if shell does not exists or is not executable */
- if (stat(pw->pw_shell, &st) != 0)
- return 0;
- if (!((st.st_mode & S_IFREG) && (st.st_mode & (S_IXOTH|S_IXUSR|S_IXGRP))))
- return 0;
+ if (pw->pw_shell && pw->pw_shell[0]) {
+ /* deny if shell does not exists or is not executable */
+ if (stat(pw->pw_shell, &st) != 0)
+ return 0;
+ if (!((st.st_mode & S_IFREG) && (st.st_mode & (S_IXOTH|S_IXUSR|S_IXGRP))))
+ return 0;
+ }
/* Return false if user is listed in DenyUsers */
if (options.num_deny_users > 0) {
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