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Re: [Qemu-devel] [PATCH] block: Add support for Secure Shell (ssh) block
From: |
Richard W.M. Jones |
Subject: |
Re: [Qemu-devel] [PATCH] block: Add support for Secure Shell (ssh) block device. |
Date: |
Thu, 21 Mar 2013 20:31:37 +0000 |
User-agent: |
Mutt/1.5.20 (2009-12-10) |
On Thu, Mar 21, 2013 at 08:35:29PM +0100, Stefan Hajnoczi wrote:
> On Thu, Mar 21, 2013 at 2:38 PM, Richard W.M. Jones <address@hidden> wrote:
> > From: "Richard W.M. Jones" <address@hidden>
> >
> > qemu-system-x86_64 -drive file=ssh://hostname/some/image
> >
> > QEMU will ssh into 'hostname' and open '/some/image' which is made
> > available as a standard block device.
> >
> > You can specify a username (ssh://address@hidden/...) and/or a port number
> > (ssh://host:port/...).
> >
> > Current limitations:
> >
> > - Authentication must be done without passwords or passphrases, using
> > ssh-agent. Other authentication methods are not supported. (*)
> >
> > - Does not check host key. (*)
> >
> > - New remote files cannot be created. (*)
> >
> > - Uses coroutine read/write, instead of true AIO. (libssh2 supports
> > non-blocking access, so this could be fixed with some effort).
> >
> > - Blocks during connection and authentication.
> >
> > (*) = potentially easy fix
> >
> > This is implemented using libssh2 on the client side. The server just
> > requires a regular ssh daemon with sftp-server support. Most ssh
> > daemons on Unix/Linux systems will work out of the box.
> > ---
> > block/Makefile.objs | 1 +
> > block/ssh.c | 514
> > ++++++++++++++++++++++++++++++++++++++++++++++++++++
> > configure | 47 +++++
> > qemu-doc.texi | 28 +++
> > 4 files changed, 590 insertions(+)
> > create mode 100644 block/ssh.c
>
> Just noticed that libcurl supports sftp.
>
> Did you try enabling sftp support in block/curl.c? I think you just
> need to add CURLPROTO_SFTP to #define PROTOCOLS.
Interestingly curl's sftp support is implemented using libssh2. I'll
take a look at how easy this will be.
Rich.
--
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
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Re: [Qemu-devel] [PATCH] block: Add support for Secure Shell (ssh) block device., Kevin Wolf, 2013/03/25