full-disclosure - OpenSSHd - Publickey-Authentication - Has 3.9 problems with 16384Bit DSA-keys?

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Message-ID: <20050113195443.48e31770.vh@helith.net>
From: vh at helith.net (vh)
Subject: OpenSSHd - Publickey-Authentication - Has 3.9
 problems with 16384Bit DSA-keys?

Can sombody confirm that OpenSSHd is not able to handle 16384-Bit
DSA-Keys?

I don't know if I miss something in the configuration but I didn't read
anything about a size-limitation for Public-Authentication and DSA-Keys
(or RSA, but I use DSA).

I created a 16384-Bit DSA-Key and stored the public part of this key in
./ssh/authorized-keys. I'm able to login with a 4096Bit DSA-Key but the
SSHd wont accapt the 16384Bit-Key and falls back to passwort
authentication.

Did I miss something in the configuration or is that a issue of OpenSSH?
Why does ssh-keygen provide -b 16384 if I can't use it?

I tested that on 3 different OpenBSD 3.6-stable mashines wich use 2
diffrent architectures.

1. normal x86
2. AMD64 in 64Bit-Mode

I asked already the misc@...nbsd-Mailinglist but during censorship the
mail wasn't send to the mailinglist yet.

The message I read in the logfiles:

Jan 13 16:15:54 inri sshd[31741]: error: key_read: uudecode
AAAAB3NzaC1kc3MAAAgBAJTlesfdygujbjsC8wWwfIuIutph2WkGoeib3ck4ZBLzZZ4sOkj
Q0XwDn7aEqGs3eXN48H0SY14kox7Gl0PUs
ZgBJxKrVzQhoxusHwq4o6AtvNK+Cwu4M7byGPNDuDrxfiXwvW25WzjpfvSL2gRc0yhhT5DM
KLpCIwIe8Wza4wnAyIGtLfNldfJ+47TG6dZ1DN7gtKQ1soVsif1TmuxRQqtJ9TpBgVT7MYH
WT54dZ2M+Vn2+eB6TkZ5L6g
dmab7f2WECMW2NBQyy7L2cPhhqnm86vaQgAzolbpTBvmvC4CKzEN0aQ2dsWGNYXDpsEh6Qn
ZaN4fuwCud9sRDwVnKoiPKsWMHvYX/5Sel4n6MI7sKDpw46ClRar0YBi50RbkLd1EDIOlkn
W/wgmwjlrKkA+pR+xhdSOLh
VCwS54/WqJVZMYK7Ts661/6WhXY8n1OzTdz7dDx

Looks like a Bug or?

Thanks for any clues.

vH
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