[36345] in Kerberos
New remctl ACL scheme and execution of external ACL checking program
daemon@ATHENA.MIT.EDU (=?windows-1252?Q?R=E9mi_Ferrand?=)
Tue Aug 5 11:55:58 2014
Message-ID: <53E0FE7B.4020201@cc.in2p3.fr>
Date: Tue, 05 Aug 2014 17:55:39 +0200
From: =?windows-1252?Q?R=E9mi_Ferrand?= <remi.ferrand@cc.in2p3.fr>
MIME-Version: 1.0
To: Russ Allbery <eagle@eyrie.org>
In-Reply-To: <53C7C022.3050508@cc.in2p3.fr>
Cc: "kerberos@mit.edu" <kerberos@mit.edu>
Content-Type: multipart/mixed; boundary="===============0222924091=="
Errors-To: kerberos-bounces@mit.edu
This is a cryptographically signed message in MIME format.
--===============0222924091==
Content-Type: multipart/signed; protocol="application/pkcs7-signature";
micalg=sha1; boundary="------------ms090605030909090009010106"
This is a cryptographically signed message in MIME format.
--------------ms090605030909090009010106
Content-Type: text/plain; charset=windows-1252; format=flowed
Content-Transfer-Encoding: quoted-printable
Sorry for the spam, afterwards I realized that this was more appropriate =
to open a new thread for this very subject.
Regards
R=E9mi
On 17/07/2014 14:22, R=E9mi Ferrand wrote:
>
> * REMCTL-8: Add support for external ACL checking programs. If the
> program exits with a zero status, access is granted. If it exits 1,
> access is not granted but checking continues. If it exits with any
> other exit status, access is not granted and checking aborts. Ideally,
> for writing generic ACL checking programs, the program should get the
> type and service of the remctl command as well as any arguments.
> However, it would also be good to support passing other arguments into
> the program as specified in the ACL file.
>
I've started to think about this feature and I think that this could be=20
a great enhancement to be able to access to requested command,=20
subcommand and args in the "acl_check_" functions (I guess that by "type =
and service of the remctl command as well as any arguments" you meant=20
"command, subcommand and args", didn't you ?)
I've created https://github.com/rra/remctl/pull/2 as a proposal but this =
could be a little "na=EFve" since it was very straightforward.
This should be more considered as a "discussion starter" about how to=20
grant access to command, subcommand and args to "acl_check_" functions.
Talking about the support for external ACL checking programs,
for now my idea is to have a configuration line like:
testcmd ALL /usr/bin/myprogram.pl exec_extra_arg=3D"--arg1 --arg2=20
--arg-with-value=3D'foo'" exec:/path/to/acl_checking_command.pl
with the new "exec" (or something like this) ACL scheme that would=20
execute the external program "/path/to/acl_checking_command.pl" and=20
check for its return code to allow/deny access or continue ACL processing=
=2E
My idea was that the program "/path/to/acl_checking_command.pl" would=20
always receive those arguments:
--user=3D"remote user authenticated throw gssapi"
--command=3D"requested command"
--subcommand=3D"requested subcommand" (if subcommand is not NULL)
(people that, in the future, would write external validation scripts=20
MUST support those options)
and if option "exec_extra_arg" is used in configurationn file, then=20
those extra arguments should be appended to previous mandatory ones,=20
which could lead to the final execution of
/path/to/acl_checking_command.pl \
--user=3D"the_user" \
--command=3D"the_command" \
--subcommand=3D"subcommand_if_any" \
--arg1 \
--arg2 \
--arg-with-value=3D'foo'
Everything above is just a proposal and opened to discussion, actually=20
I'll be glad to have other ideas / opinions.
Cheers
R=E9mi
--------------ms090605030909090009010106
Content-Type: application/pkcs7-signature; name="smime.p7s"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="smime.p7s"
Content-Description: S/MIME Cryptographic Signature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--------------ms090605030909090009010106--
--===============0222924091==
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
________________________________________________
Kerberos mailing list Kerberos@mit.edu
https://mailman.mit.edu/mailman/listinfo/kerberos
--===============0222924091==--
