revoking ssh-cert.pub with serial revokes also younger certs
wertstoffe at schuerz.at
Tue Sep 17 01:12:36 AEST 2019
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?
Am 16.09.19 um 04:18 schrieb Damien Miller:
> On Fri, 13 Sep 2019, Jakob Schürz wrote:
>> Hi there!
>> What am I doing wrong?
>> I created a ssh-certificate
>> id_user_rsa-cert.pub with this dump:
>> 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
>> Critical Options: (none)
>> Now i try to revoke this certificate with
>> ssh-keygen -s ../user_ca.pub -kf /etc/ssh/revoked_keys -z 17
>> 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)):
>> 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.
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