Problem with sshd on W7 with 32bit cygwin 3.0

Problem with sshd on W7 with 32bit cygwin 3.0

[Enrico Forestieri]

After upgrading to cygwin 3.0.0 (32bit version) on W7 64bit, it is
not possible to connect using ssh. The returned error is something
like "Connection closed by x.x.x.x port 22".

I also tried the 2019-02-18 snapshot without success.
However, simply downgrading to 2.11.2 fixes the issue.

This issue does not seem to affect 64bit cygwin versions on W10.

-- 
Enrico

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Re: Problem with sshd on W7 with 32bit cygwin 3.0

[Corinna Vinschen]

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On Feb 18 11:58, Enrico Forestieri wrote:
> After upgrading to cygwin 3.0.0 (32bit version) on W7 64bit, it is
> not possible to connect using ssh. The returned error is something
> like "Connection closed by x.x.x.x port 22".
> 
> I also tried the 2019-02-18 snapshot without success.
> However, simply downgrading to 2.11.2 fixes the issue.

I tested this myself and from what I can tell, Microsoft didn't
implement S4U for local accounts on WOW64 on older OSes.  If I
start a 32 bit sshd from an Windows 7 64 bit WOW64 environment,
then domain accounts work fine using kerberos S4U, but for local
accounts with MsV1_0 S4U the underlying Windows function returns
STATUS_INVALID_PARAMETER.

Note that this works fine in Windows 7 64 bit with 64 bit Cygwin.  It
seems only older WOW64 environments (maybe even only in W7) didn't
implement this.

Two workarounds for now:

- Start sshd as 64 bit Cygwin process.
- Utilize https://cygwin.com/cygwin-ug-net/ntsec.html#ntsec-nopasswd3


Corinna

-- 
Corinna Vinschen
Cygwin Maintainer

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Re: Problem with sshd on W7 with 32bit cygwin 3.0

[Enrico Forestieri]

On Mon, Feb 18, 2019 at 03:11:11PM +0100, Corinna Vinschen wrote:
> 
> Two workarounds for now:
> 
> - Start sshd as 64 bit Cygwin process.
> - Utilize https://cygwin.com/cygwin-ug-net/ntsec.html#ntsec-nopasswd3

Thank you. The second method above worked. This is a private network,
so that is Ok.

-- 
Enrico

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Re: Problem with sshd on W7 with 32bit cygwin 3.0

[Corinna Vinschen]

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On Feb 18 17:04, Enrico Forestieri wrote:
> On Mon, Feb 18, 2019 at 03:11:11PM +0100, Corinna Vinschen wrote:
> > 
> > Two workarounds for now:
> > 
> > - Start sshd as 64 bit Cygwin process.
> > - Utilize https://cygwin.com/cygwin-ug-net/ntsec.html#ntsec-nopasswd3
> 
> Thank you. The second method above worked. This is a private network,
> so that is Ok.

I uploaded new developer snapshots with fixes for this problem:
https://cygwin.com/snapshots/  Please give it a try. 


Thanks,
Corinna

-- 
Corinna Vinschen
Cygwin Maintainer

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Re: Problem with sshd on W7 with 32bit cygwin 3.0

[Enrico Forestieri]

On Mon, Feb 18, 2019 at 09:54:50PM +0100, Corinna Vinschen wrote:
> On Feb 18 17:04, Enrico Forestieri wrote:
> > On Mon, Feb 18, 2019@03:11:11PM +0100, Corinna Vinschen wrote:
> > > 
> > > Two workarounds for now:
> > > 
> > > - Start sshd as 64 bit Cygwin process.
> > > - Utilize https://cygwin.com/cygwin-ug-net/ntsec.html#ntsec-nopasswd3
> > 
> > Thank you. The second method above worked. This is a private network,
> > so that is Ok.
> 
> I uploaded new developer snapshots with fixes for this problem:
> https://cygwin.com/snapshots/  Please give it a try. 

Thanks. I can confirm that with this snaspshot sshd works fine without
the need for the workaround.

-- 
Enrico

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Re: Problem with sshd on W7 with 32bit cygwin 3.0

[Corinna Vinschen]

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On Feb 19 11:30, Enrico Forestieri wrote:
> On Mon, Feb 18, 2019 at 09:54:50PM +0100, Corinna Vinschen wrote:
> > On Feb 18 17:04, Enrico Forestieri wrote:
> > > On Mon, Feb 18, 2019@03:11:11PM +0100, Corinna Vinschen wrote:
> > > > 
> > > > Two workarounds for now:
> > > > 
> > > > - Start sshd as 64 bit Cygwin process.
> > > > - Utilize https://cygwin.com/cygwin-ug-net/ntsec.html#ntsec-nopasswd3
> > > 
> > > Thank you. The second method above worked. This is a private network,
> > > so that is Ok.
> > 
> > I uploaded new developer snapshots with fixes for this problem:
> > https://cygwin.com/snapshots/  Please give it a try. 
> 
> Thanks. I can confirm that with this snaspshot sshd works fine without
> the need for the workaround.

Thanks for testing!


Corinna

-- 
Corinna Vinschen
Cygwin Maintainer

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