From: Chad Sellers <csellers@tresys.com>
To: Chad Hanson <chanson@TrustedCS.com>
Cc: SELinux List <selinux@tycho.nsa.gov>,
Stephen Smalley <sds@tycho.nsa.gov>
Subject: Re: [PATCH] mls passwd policy
Date: Thu, 26 Jan 2006 21:58:57 -0500 [thread overview]
Message-ID: <43D98C71.9010601@tresys.com> (raw)
In-Reply-To: <20060126222637.GB13279@dhcp-236.il.tcs-sec.com>
Chad Hanson wrote:
> Below is a patch to enable generic user password changing at labels above s0.
> The passwd command only changes the shadow file and does not touch the
> password file. The chfn/chsh commands do not have MLS privileges, so there
> is not a downgrade channel at the current time.
At first look, chage is labeled passwd_exec_t as well, so that's a
bigger downgrade channel. So, if we want to make passwd a trusted
program, we have to split out chage into a separate domain, and make
sure nothing else can get into passwd_t.
That said, as Steve S. pointed out, passwd is still a downgrade channel.
It may be somewhat limited in bandwidth, but it's available to all users
of the system. So, we need to at least document these channels, as Steve
G. pointed out.
Chad Sellers
>
> -Chad
>
>
> diff -Nur serefpolicy-2.2.4/policy/modules/admin/usermanage.te serefpolicy-2.2.4.new/policy/modules/admin/usermanage.te
> --- serefpolicy-2.2.4/policy/modules/admin/usermanage.te 2006-01-23 07:33:45.000000000 -0600
> +++ serefpolicy-2.2.4.new/policy/modules/admin/usermanage.te 2006-01-25 15:54:16.000000000 -0600
> @@ -328,6 +328,9 @@
>
> miscfiles_read_localization(passwd_t)
>
> +mls_file_write_down(passwd_t)
> +mls_file_downgrade(passwd_t)
> +
> seutil_dontaudit_search_config(passwd_t)
>
> userdom_use_unpriv_users_fd(passwd_t)
>
--
----------------------
Chad Sellers
Tresys Technology, LLC
http://www.tresys.com
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next prev parent reply other threads:[~2006-01-27 2:58 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-26 22:26 [PATCH] mls passwd policy Chad Hanson
2006-01-27 2:58 ` Chad Sellers [this message]
-- strict thread matches above, loose matches on Subject: below --
2006-01-27 16:46 Chad Hanson
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