Date: Tue, 20 Sep 2011 15:13:32 -0400 From: Mike Tancsa <mike@sentex.net> To: Corey Smith <corsmith@gmail.com> Cc: freebsd-security@freebsd.org Subject: pam_ssh_agent_auth coredump on AMD64 (was Re: PAM modules) Message-ID: <4E78E5DC.6050600@sentex.net> In-Reply-To: <4E778357.1030206@sentex.net> References: <CAHQQXOObKpCU9syvv0tYfets9%2BsMKjYU0ONeQ23KGkOOnxJOaA@mail.gmail.com> <4E778357.1030206@sentex.net>
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On 9/19/2011 2:00 PM, Mike Tancsa wrote:
> On 9/16/2011 3:10 PM, Corey Smith wrote:
>> On 09/16/2011 11:05 AM, Dag-Erling Smørgrav wrote:
>>> My question is: which ones?
>>
>> security/pam_ssh_agent_auth
>>
>> It is BSD licensed and handy for sudo.
>
>
> Neato, I didnt know of this module for sudo! However, with the default
> install on AMD64, I am getting coredump.
Actually, I tried the same setup on i386 and it seems to work just fine.
However, on an AMD64 machine, sudo just coredumps. Anyone running this
setup on amd64 ?
Running with -D9, normally it looks something like
% sudo -D9 su
sudo: settings: debug_level=9
sudo: settings: progname=sudo
sudo: settings: network_addrs=....
sudo: sudo_mode 1
sudo: policy plugin returns 1
sudo: command info: umask=022
sudo: command info: command=/usr/bin/su
sudo: command info: runas_uid=0
sudo: command info: runas_gid=0
sudo: command info: runas_groups=0,5
sudo: command info: closefrom=3
sudo: command info: set_utmp=true
sudo: command info: login_class=default
where as on amd64,
% sudo -D9 su
sudo: settings: debug_level=9
sudo: settings: progname=sudo
sudo: settings: network_addrs=....
sudo: sudo_mode 1
Segmentation fault
It seems to die in the call to
static int
policy_check(struct plugin_container *plugin, int argc, char * const argv[],
char *env_add[], char **command_info[], char **argv_out[],
char **user_env_out[])
{
return plugin->u.policy->check_policy(argc, argv, env_add, command_info,
argv_out, user_env_out);
}
I cant get it to coredump since its setuid. Before I start adding more
debug printfs, does anyone have any suggestions as to what it might be ?
---Mike
>
> I added
>
>
> # auth
> auth include system
> -
> +auth sufficient /usr/local/lib/pam_ssh_agent_auth.so
> file=/etc/sudokeys debug
> # account
> account include system
>
> to /usr/local/etc/pam.d/sudo
>
> and added
>
> --- sudoers.sample 2011-09-19 13:24:56.000000000 -0400
> +++ sudoers 2011-09-19 13:29:17.000000000 -0400
> @@ -62,6 +62,10 @@
> ## Uncomment to enable special input methods. Care should be taken as
> ## this may allow users to subvert the command being run via sudo.
> # Defaults env_keep += "XMODIFIERS GTK_IM_MODULE QT_IM_MODULE
> QT_IM_SWITCHER"
> +
> +Defaults env_keep += SSH_AUTH_SOCK
> +
> +
>
>
> I must be missing something obvious?
>
> ---Mike
>
>
--
-------------------
Mike Tancsa, tel +1 519 651 3400
Sentex Communications, mike@sentex.net
Providing Internet services since 1994 www.sentex.net
Cambridge, Ontario Canada http://www.tancsa.com/
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