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Subject: bug#33266: guix-copy: Honor the SSH port of a host when defined in ~/.ssh/config
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From: Maxim Cournoyer <maxim.cournoyer@HIDDEN>
Date: Sun, 04 Nov 2018 23:58:27 -0500
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--=-=-=
Content-Type: text/plain

Hello,

I recently stumbled on the bug where guix copy would the port 22 even
when I had specified a different one in my ~/.ssh/config file.

This bug is triggered when omitting the port in the --to= (or --from)
expression, such as in

guix copy --to=somehost bash

And where somehost exists in ~/.ssh/config, say:

Host somehost
     User someuser
     HostName someplace.somedns.net
     Port 1234

Instead of using port 1234, the port 22 would be used.  Commit
cc1dfc202f is the reason of this overriding; the attached patch 
reverts it, with a detailed explanation.

Thank you,

Maxim


--=-=-=
Content-Type: text/x-patch
Content-Disposition: attachment;
 filename=0001-Revert-copy-Default-to-port-22.patch

From 942eb8cabef5b7c8b4425c765b6ee2ac9f529ad8 Mon Sep 17 00:00:00 2001
From: Maxim Cournoyer <maxim.cournoyer@HIDDEN>
Date: Sun, 4 Nov 2018 23:35:16 -0500
Subject: [PATCH] Revert "copy: Default to port 22."

This reverts commit cc1dfc202f2fefb6c2eb9467d1fc90a9154550c9.  Specifying a
default port had the undesirable effect of disregarding a port specification
for a given host in the ~/.ssh/config that would otherwise have been honored
at the time `open-ssh-session' calls the `session-parse-config!' method.

In any case, `make-session' will default the port value of the created session
to 22 if left unspecified.
---
 guix/scripts/copy.scm | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/guix/scripts/copy.scm b/guix/scripts/copy.scm
index 4c8592985..d35eed74e 100644
--- a/guix/scripts/copy.scm
+++ b/guix/scripts/copy.scm
@@ -75,8 +75,7 @@ package names, build the underlying packages before sending them."
 
       (and (or (assoc-ref opts 'dry-run?)
                (build-derivations local drv))
-           (let* ((session (open-ssh-session host #:user user
-                                             #:port (or port 22)))
+           (let* ((session (open-ssh-session host #:user user #:port port))
                   (sent    (send-files local items
                                        (connect-to-remote-daemon session)
                                        #:recursive? #t)))
@@ -89,7 +88,7 @@ package names, build the underlying packages before sending them."
     (let*-values (((user host port)
                    (ssh-spec->user+host+port source))
                   ((session)
-                   (open-ssh-session host #:user user #:port (or port 22)))
+                   (open-ssh-session host #:user user #:port port))
                   ((remote)
                    (connect-to-remote-daemon session)))
       (set-build-options-from-command-line local opts)
-- 
2.19.0


--=-=-=--




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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Maxim Cournoyer <maxim.cournoyer@HIDDEN>
Subject: bug#33266: Acknowledgement (guix-copy: Honor the SSH port of a
 host when defined in ~/.ssh/config)
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X-Gnu-PR-Message: ack 33266
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Contact help-debbugs@HIDDEN with problems


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Subject: bug#33266: guix-copy: Honor the SSH port of a host when defined in ~/.ssh/config
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Hello,

Maxim Cournoyer <maxim.cournoyer@HIDDEN> skribis:

> From 942eb8cabef5b7c8b4425c765b6ee2ac9f529ad8 Mon Sep 17 00:00:00 2001
> From: Maxim Cournoyer <maxim.cournoyer@HIDDEN>
> Date: Sun, 4 Nov 2018 23:35:16 -0500
> Subject: [PATCH] Revert "copy: Default to port 22."
>
> This reverts commit cc1dfc202f2fefb6c2eb9467d1fc90a9154550c9.  Specifying=
 a
> default port had the undesirable effect of disregarding a port specificat=
ion
> for a given host in the ~/.ssh/config that would otherwise have been hono=
red
> at the time `open-ssh-session' calls the `session-parse-config!' method.
>
> In any case, `make-session' will default the port value of the created se=
ssion
> to 22 if left unspecified.

This looks good, and indeed it=E2=80=99s an unintended consequence of commit
cc1dfc202f2fefb6c2eb9467d1fc90a9154550c9.

However, the log of commit cc1dfc had this:

   Failing to do that, "%p" would be "0" when using "ProxyCommand"
   in ~/.ssh/config.

This is arguably a defect in either Guile-SSH or (more likely) libssh,
and it would be nice to report it.

Would you like to report it upstream?

Thanks,
Ludo=E2=80=99.




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From: Maxim Cournoyer <maxim.cournoyer@HIDDEN>
References: <87a7mo5de4.fsf@HIDDEN> <87o9b21ehv.fsf@HIDDEN>
Date: Thu, 08 Nov 2018 22:35:32 -0500
In-Reply-To: <87o9b21ehv.fsf@HIDDEN> ("Ludovic
 \=\?utf-8\?Q\?Court\=C3\=A8s\=22'\?\=
 \=\?utf-8\?Q\?s\?\= message of "Tue, 06 Nov 2018 15:12:44 +0100")
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Hello!

ludo@HIDDEN (Ludovic Court=C3=A8s) writes:

[...]

> This looks good, and indeed it=E2=80=99s an unintended consequence of com=
mit
> cc1dfc202f2fefb6c2eb9467d1fc90a9154550c9.
>
> However, the log of commit cc1dfc had this:
>
>    Failing to do that, "%p" would be "0" when using "ProxyCommand"
>    in ~/.ssh/config.

Yeah, I had seen this message, but was doubting if it was still
valid. Helas, it seems so:

Given the ~/.ssh/config snippet (and configured machines):
--8<---------------cut here---------------start------------->8---
Host vm-host
     HostName 10.5.5.5
     User someuser
=20=20=20=20=20
Host some-guest
     IdentityFile ~/.ssh/vm-host/id_rsa
     HostName some-guest
     User guest
     ProxyCommand ssh vm-host nc %h %p
--8<---------------cut here---------------end--------------->8---

--8<---------------cut here---------------start------------->8---
scheme@(guile-user)> ,use (ssh session)
scheme@(guile-user)> (make-session #:host "some-guest")
$1 =3D #<session #<undefined>@some-guest:22 (disconnected) 11dffe0>
scheme@(guile-user)> (session-get $1 'host)
$2 =3D "some-guest"
scheme@(guile-user)> (session-get $1 'port)
$3 =3D 22
scheme@(guile-user)> (session-parse-config! $1 "~/.ssh/config")
$4 =3D #<undefined>
scheme@(guile-user)> (session-get $1 'port)
$5 =3D 22
scheme@(guile-user)> (connect! $1)
$6 =3D error
scheme@(guile-user)> (make-session #:host "some-guest" #:port 22)
$7 =3D #<session #<undefined>@some-guest:22 (disconnected) 11dffc0>
scheme@(guile-user)> (session-parse-config! $7 "~/.ssh/config")
$8 =3D #<undefined>
scheme@(guile-user)> (session-get $7 'port)
$9 =3D 22
scheme@(guile-user)> (connect! $7)
$10 =3D ok
--8<---------------cut here---------------end--------------->8---

> This is arguably a defect in either Guile-SSH or (more likely) libssh,
> and it would be nice to report it.
>
> Would you like to report it upstream?

It has to be in libssh. I'll try to come up with a repro in C, and
submit the issue to them.

When it's done, I'll add a note in the code.

To be continued... Thanks for looking :)

Maxim




Message sent to bug-guix@HIDDEN:


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From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
References: <87a7mo5de4.fsf@HIDDEN> <87o9b21ehv.fsf@HIDDEN>
 <871s7u53ej.fsf@HIDDEN>
Date: Tue, 22 Jan 2019 23:09:07 +0100
In-Reply-To: <871s7u53ej.fsf@HIDDEN> (Maxim Cournoyer's message of "Thu, 08
 Nov 2018 22:35:32 -0500")
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Hi Maxim,

Maxim Cournoyer <maxim.cournoyer@HIDDEN> skribis:

> ludo@HIDDEN (Ludovic Court=C3=A8s) writes:
>
> [...]
>
>> This looks good, and indeed it=E2=80=99s an unintended consequence of co=
mmit
>> cc1dfc202f2fefb6c2eb9467d1fc90a9154550c9.
>>
>> However, the log of commit cc1dfc had this:
>>
>>    Failing to do that, "%p" would be "0" when using "ProxyCommand"
>>    in ~/.ssh/config.
>
> Yeah, I had seen this message, but was doubting if it was still
> valid. Helas, it seems so:

[...]

>> This is arguably a defect in either Guile-SSH or (more likely) libssh,
>> and it would be nice to report it.
>>
>> Would you like to report it upstream?
>
> It has to be in libssh. I'll try to come up with a repro in C, and
> submit the issue to them.

With the recent upgrade to libssh 0.8.6, is the issue still present?

Ludo=E2=80=99.





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