Date: Sun, 24 Jun 2012 22:10:33 -0400 From: Robert Simmons <rsimmons0@gmail.com> To: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net> Cc: freebsd-security@freebsd.org Subject: Re: Add rc.conf variables to control host key length Message-ID: <CA%2BQLa9Ck1Fyg=oLcMFtZ_qYGP7MbyhFFOUJTzXjrGV6vrNhffQ@mail.gmail.com> In-Reply-To: <90EAF0C3-C676-4C20-A981-86FC88BAC29D@lists.zabbadoz.net> References: <CA%2BQLa9CX26xEwRsz3g6FvBBbbFE0Gfw%2BUR6_RHYOXgZFcgCw5w@mail.gmail.com> <4828EFCC-E60A-4961-9228-4A1ADAD28F73@lists.zabbadoz.net> <CA%2BQLa9DxE5D5ZeQ6M-FQGRySCGytQ=Qn2ZyNMYuCfSLGV1gdQw@mail.gmail.com> <90EAF0C3-C676-4C20-A981-86FC88BAC29D@lists.zabbadoz.net>
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On Sun, Jun 24, 2012 at 9:46 PM, Bjoern A. Zeeb <bzeeb-lists@lists.zabbadoz.net> wrote: > > 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. =A0I have updated the patch to reflect this and >> attached the new patch. =A0Good 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. =A0Actually, "used with" is not controlled in sshd_config. =A0Only t= he >> path to the key files is controlled by that config. >> The sshd_flags variable in rc.conf is what controls "used with". =A0For >> 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. =A0The only way to go about this is to set the following: >> sshd_flags=3D"-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? =A0I'd really > prefer that to a command line option. And vice versa. Let's say you only uncomment the line for RSA keys in sshd_config. Your server will still present the ECDSA key to clients that understand it.
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