Date: Mon, 25 Jun 2012 01:46:02 +0000 From: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net> To: Robert Simmons <rsimmons0@gmail.com> Cc: freebsd-security@freebsd.org Subject: Re: Add rc.conf variables to control host key length Message-ID: <90EAF0C3-C676-4C20-A981-86FC88BAC29D@lists.zabbadoz.net> In-Reply-To: <CA%2BQLa9DxE5D5ZeQ6M-FQGRySCGytQ=Qn2ZyNMYuCfSLGV1gdQw@mail.gmail.com> References: <CA%2BQLa9CX26xEwRsz3g6FvBBbbFE0Gfw%2BUR6_RHYOXgZFcgCw5w@mail.gmail.com> <4828EFCC-E60A-4961-9228-4A1ADAD28F73@lists.zabbadoz.net> <CA%2BQLa9DxE5D5ZeQ6M-FQGRySCGytQ=Qn2ZyNMYuCfSLGV1gdQw@mail.gmail.com>
index | next in thread | previous in thread | raw e-mail
On 24. Jun 2012, at 17:14 , Robert Simmons wrote: > On Sun, Jun 24, 2012 at 12:34 PM, Bjoern A. Zeeb > <bzeeb-lists@lists.zabbadoz.net> wrote: >> On 24. Jun 2012, at 16:07 , Robert Simmons wrote: >>> Here is a set of patches that add functionality to rc.conf allowing >>> users an easy way to control the length of the host keys used with ssh >>> (specifically RSA and ECDSA used with protocol version 2). >> >> Created for, not used with -- right? > > Yes, created for. I have updated the patch to reflect this and > attached the new patch. Good eye, thanks. > >> The used with is controlled in sshd_config and if the key is not there >> but it's enabled in sshd_config you'll get a warning on boot which is >> very annoying. > > No. Actually, "used with" is not controlled in sshd_config. Only the > path to the key files is controlled by that config. > The sshd_flags variable in rc.conf is what controls "used with". For > example, on my installs, I only want to use the ECDSA key and not > present any other protocol v2 keys to clients, thereby restricting it > to ECDSA. The only way to go about this is to set the following: > sshd_flags="-h /etc/ssh/ssh_host_ecdsa_key" > Take a look at sshd(8), specifically the -h option for clarification. Aha, multiple options to accomplish the same thing. HostKey /etc/ssh/ssh_host_ecdsa_key in sshd_config should accomplish the same, shouldn't it? I'd really prefer that to a command line option. /bz -- Bjoern A. Zeeb You have to have visions! It does not matter how good you are. It matters what good you do!home | help
Want to link to this message? Use this
URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?90EAF0C3-C676-4C20-A981-86FC88BAC29D>