openssh unix dev - Sep 2019 - revoking ssh-cert.pub with serial revokes also younger certs

Hi there!

What am I doing wrong?

I created a ssh-certificate

id_user_rsa-cert.pub with this dump:

id_user_rsa-cert.pub:
root at host # ssh-keygen -Lf id_user_rsa-cert.pub
??????? Type: ssh-rsa-cert-v01 at openssh.com user certificate
??????? Public key: RSA-CERT SHA256:kPitwgxblaUH4viBoFoozSPq9Pblubbedk
??????? Signing CA: ED25519 SHA256:8p2foobarQo3Tfcblubb5+I5cboeckvpnktiHdUs
??????? Key ID: "test at myhost.mydomain.example"
??????? Serial: 18
??????? Valid: from 2019-07-29T02:08:00 to 2020-07-28T02:09:43
??????? Principals:
??????????????? test
??????? Critical Options: (none)
??????? Extensions:
??????????????? permit-X11-forwarding
??????????????? permit-agent-forwarding
??????????????? permit-port-forwarding
??????????????? permit-pty
??????????????? permit-user-rc


Now i try to revoke this certificate with

ssh-keygen -s ../user_ca.pub -kf /etc/ssh/revoked_keys -z 17
id_user_rsa-cert.pub

The serial is 1 less the serial of my created certificate

Check, if my certificate is valid

root at host # ssh-keygen -Qf /etc/ssh/revoked_keys id_user_rsa-cert.pub
id_user_rsa-cert.pub (test on myhost - created by ansible (1564358942)):
REVOKED

Why? I thougt, when i use -s <Serialnumber> only this specific
certificate for a pubkey is revoked...

jakob

-- 
lore ipsum

On Fri, 13 Sep 2019, Jakob Sch?rz wrote:
> Hi there!
> 
> What am I doing wrong?
> 
> I created a ssh-certificate
> 
> id_user_rsa-cert.pub with this dump:
> 
> id_user_rsa-cert.pub:
> root at host # ssh-keygen -Lf id_user_rsa-cert.pub
> ??????? Type: ssh-rsa-cert-v01 at openssh.com user certificate
> ??????? Public key: RSA-CERT SHA256:kPitwgxblaUH4viBoFoozSPq9Pblubbedk
> ??????? Signing CA: ED25519 SHA256:8p2foobarQo3Tfcblubb5+I5cboeckvpnktiHdUs
> ??????? Key ID: "test at myhost.mydomain.example"
> ??????? Serial: 18
> ??????? Valid: from 2019-07-29T02:08:00 to 2020-07-28T02:09:43
> ??????? Principals:
> ??????????????? test
> ??????? Critical Options: (none)
> ??????? Extensions:
> ??????????????? permit-X11-forwarding
> ??????????????? permit-agent-forwarding
> ??????????????? permit-port-forwarding
> ??????????????? permit-pty
> ??????????????? permit-user-rc
> 
> 
> Now i try to revoke this certificate with
> 
> ssh-keygen -s ../user_ca.pub -kf /etc/ssh/revoked_keys -z 17
> id_user_rsa-cert.pub
> 
> The serial is 1 less the serial of my created certificate
> 
> Check, if my certificate is valid
> 
> root at host # ssh-keygen -Qf /etc/ssh/revoked_keys id_user_rsa-cert.pub
> id_user_rsa-cert.pub (test on myhost - created by ansible (1564358942)):
> REVOKED
> 
> Why? I thougt, when i use -s <Serialnumber> only this specific
> certificate for a pubkey is revoked...
If you compile krl.c with -DDEBUG_KRL=1 then you can get some extra
debugging that might show what is going on. You'll probably need to
add -vvv to ssh-keygen's flags too.

-d

Hi Daminan!


Hmmm... thought about a little...

when i use -vvv with ssh-keygen -Qf i see "debug1:..." So i think,
debug
is compiled in.

ssh-keygen --help gives me

ssh-keygen -k -f krl_file [-u] [-s ca_public] [-z version_number] file ...

so... option -z is not the serial of the certificate, it is the
version-number of the KRL-File...

My openssh-Verision from Debian is 1:7.4p1-10+deb9u7. Maybe, this
openssh-version does not support revoking a certificate by it's
serialnumber. This leads me to the next question... The serial-number of
a certificate is uniq over all certificates, or is it allowed, to
increment serial-numbers for each certificate separate? How is the design?


thank you

jakob

Am 16.09.19 um 04:18 schrieb Damien Miller:
> On Fri, 13 Sep 2019, Jakob Sch?rz wrote:
>
>> Hi there!
>>
>> What am I doing wrong?
>>
>> I created a ssh-certificate
>>
>> id_user_rsa-cert.pub with this dump:
>>
>> id_user_rsa-cert.pub:
>> root at host # ssh-keygen -Lf id_user_rsa-cert.pub
>> ??????? Type: ssh-rsa-cert-v01 at openssh.com user certificate
>> ??????? Public key: RSA-CERT SHA256:kPitwgxblaUH4viBoFoozSPq9Pblubbedk
>> ??????? Signing CA: ED25519
SHA256:8p2foobarQo3Tfcblubb5+I5cboeckvpnktiHdUs
>> ??????? Key ID: "test at myhost.mydomain.example"
>> ??????? Serial: 18
>> ??????? Valid: from 2019-07-29T02:08:00 to 2020-07-28T02:09:43
>> ??????? Principals:
>> ??????????????? test
>> ??????? Critical Options: (none)
>> ??????? Extensions:
>> ??????????????? permit-X11-forwarding
>> ??????????????? permit-agent-forwarding
>> ??????????????? permit-port-forwarding
>> ??????????????? permit-pty
>> ??????????????? permit-user-rc
>>
>>
>> Now i try to revoke this certificate with
>>
>> ssh-keygen -s ../user_ca.pub -kf /etc/ssh/revoked_keys -z 17
>> id_user_rsa-cert.pub
>>
>> The serial is 1 less the serial of my created certificate
>>
>> Check, if my certificate is valid
>>
>> root at host # ssh-keygen -Qf /etc/ssh/revoked_keys
id_user_rsa-cert.pub
>> id_user_rsa-cert.pub (test on myhost - created by ansible
(1564358942)):
>> REVOKED
>>
>> Why? I thougt, when i use -s <Serialnumber> only this specific
>> certificate for a pubkey is revoked...
> If you compile krl.c with -DDEBUG_KRL=1 then you can get some extra
> debugging that might show what is going on. You'll probably need to
> add -vvv to ssh-keygen's flags too.
>
> -d
> _______________________________________________
> openssh-unix-dev mailing list
> openssh-unix-dev at mindrot.org
> https://lists.mindrot.org/mailman/listinfo/openssh-unix-dev
-- 
lore ipsum