[Buildroot] Using an older package than the one provided by BR

[Buildroot] Using an older package than the one provided by BR

[Jacques Samoun]

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Hello,

I know that the following is not supported, for a lot of reason, but:

I am using a quite recent version of BR (embedded platform, ARM base) which
comes with openssh 8.6p1. However, as i have to support legacy connected
devices, i discovered that "old" ssh clients (7.1, 7.3, etc ..) have
sometimes problems connecting to ssh server 8.6p1.
So i am contemplating the option of "downgrading" the openssh package to
something like "7.6" but still keeping my BR at the same version.
I also know that there might be compatibility issues with newer libs, etc
.. However, this is worth a try.

What do guys think is the best way to do so ?

Thanks,
Jacques

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Re: [Buildroot] Using an older package than the one provided by BR

[Thomas Petazzoni]

On Mon, 27 Dec 2021 18:18:16 +0200
Jacques Samoun <jacques.samoun33@gmail.com> wrote:

> I am using a quite recent version of BR (embedded platform, ARM base) which
> comes with openssh 8.6p1. However, as i have to support legacy connected
> devices, i discovered that "old" ssh clients (7.1, 7.3, etc ..) have
> sometimes problems connecting to ssh server 8.6p1.
> So i am contemplating the option of "downgrading" the openssh package to
> something like "7.6" but still keeping my BR at the same version.
> I also know that there might be compatibility issues with newer libs, etc
> .. However, this is worth a try.
> 
> What do guys think is the best way to do so ?

For something such as openssh that doesn't have any (or very few)
reverse dependencies, you could create an old-openssh package in your
BR2_EXTERNAL, stuck to whatever version makes sense to you.

I'm not familiar with all the incompatibilities between OpenSSH
versions, but isn't there a way to convince your OpenSSH 8.x to support
the older cyphers/protocols used by OpenSSH 7.x ?

Thomas
-- 
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com
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Re: [Buildroot] Using an older package than the one provided by BR

[Jacques Samoun]

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Hi,

thanks for the tip, this look like the most sensible way of doing it. I
will go this route.

..... and yes, still struggling convincing OpenSSH8 to behave correctly
with older clients  !
THanks,
Jacques

On Mon, Dec 27, 2021 at 10:05 PM Thomas Petazzoni <
thomas.petazzoni@bootlin.com> wrote:

> On Mon, 27 Dec 2021 18:18:16 +0200
> Jacques Samoun <jacques.samoun33@gmail.com> wrote:
>
> > I am using a quite recent version of BR (embedded platform, ARM base)
> which
> > comes with openssh 8.6p1. However, as i have to support legacy connected
> > devices, i discovered that "old" ssh clients (7.1, 7.3, etc ..) have
> > sometimes problems connecting to ssh server 8.6p1.
> > So i am contemplating the option of "downgrading" the openssh package to
> > something like "7.6" but still keeping my BR at the same version.
> > I also know that there might be compatibility issues with newer libs, etc
> > .. However, this is worth a try.
> >
> > What do guys think is the best way to do so ?
>
> For something such as openssh that doesn't have any (or very few)
> reverse dependencies, you could create an old-openssh package in your
> BR2_EXTERNAL, stuck to whatever version makes sense to you.
>
> I'm not familiar with all the incompatibilities between OpenSSH
> versions, but isn't there a way to convince your OpenSSH 8.x to support
> the older cyphers/protocols used by OpenSSH 7.x ?
>
> Thomas
> --
> Thomas Petazzoni, co-owner and CEO, Bootlin
> Embedded Linux and Kernel engineering and training
> https://bootlin.com
>

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