From: ludo@gnu.org (Ludovic Courtès)
To: "Thompson, David" <dthompson2@worcester.edu>
Cc: 23605@debbugs.gnu.org
Subject: bug#23605: /dev/urandom not seeded across reboots
Date: Wed, 25 May 2016 23:53:33 +0200 [thread overview]
Message-ID: <87a8jd9542.fsf@gnu.org> (raw)
In-Reply-To: <CAJ=Rwfb0gqA757c5hPXtcNEaT5dOa-Rowp+sf-mQwdT+oLHP=g@mail.gmail.com> (David Thompson's message of "Tue, 24 May 2016 12:26:29 -0400")
"Thompson, David" <dthompson2@worcester.edu> skribis:
> On Tue, May 24, 2016 at 12:16 PM, Leo Famulari <leo@famulari.name> wrote:
[...]
>> When I boot a GuixSD VM for the first time [0], it requires me to dance
>> on the keyboard until it has collected ~200 bits of entropy. I assumed
>> this is to properly bootstrap the CSPRNG in /dev/urandom, but I'm not
>> sure.
>
> This is just an annoying feature of GNU lsh. I want to switch my
> machines to OpenSSH sometime, partly due to this.
It’s actually ‘lsh-make-seed’ that does that (info "(lsh)
lsh-make-seed"), and it’s invoked from our ‘lsh-service’ when
#:initialize? is #t (the default).
It’s possible to set #:initialize? to #f, but then you still need to
create (or provide) the random seed at some point. At the time people
felt that having it default to #t would be less surprising.
> It impedes automated provisioning of servers, which OpenSSH does not do.
Maybe OpenSSH assumes that the kernel-provided randomness is good
enough?
Ludo’.
next prev parent reply other threads:[~2016-05-25 21:54 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-23 17:58 bug#23605: /dev/urandom not seeded across reboots Leo Famulari
2016-05-24 7:05 ` Taylan Ulrich Bayırlı/Kammer
2016-05-24 16:16 ` Leo Famulari
2016-05-24 16:26 ` Thompson, David
2016-05-24 17:23 ` Leo Famulari
2016-05-24 17:29 ` Thompson, David
2016-05-25 21:53 ` Ludovic Courtès [this message]
2016-05-24 12:24 ` Ludovic Courtès
2016-05-25 16:38 ` Leo Famulari
2016-05-25 16:54 ` Ludovic Courtès
2016-05-26 16:47 ` Leo Famulari
2016-05-28 13:57 ` Ludovic Courtès
2016-05-28 18:05 ` Leo Famulari
2016-05-28 18:10 ` Leo Famulari
2016-05-28 18:26 ` Leo Famulari
2016-05-28 20:41 ` Leo Famulari
2016-05-28 20:53 ` Ludovic Courtès
2016-05-29 0:00 ` Leo Famulari
2016-05-29 0:04 ` Leo Famulari
2016-05-29 20:23 ` Ludovic Courtès
2016-05-28 1:12 ` Leo Famulari
2016-05-28 13:51 ` Ludovic Courtès
2016-05-28 1:05 ` Leo Famulari
2016-05-28 1:11 ` Ben Woodcroft
2016-05-28 1:45 ` Leo Famulari
2016-05-28 9:40 ` Ben Woodcroft
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
List information: https://guix.gnu.org/
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=87a8jd9542.fsf@gnu.org \
--to=ludo@gnu.org \
--cc=23605@debbugs.gnu.org \
--cc=dthompson2@worcester.edu \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this public inbox
https://git.savannah.gnu.org/cgit/guix.git
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).