Cygwin 3.4.9 - how to install ssh-keygen

[Brian Inglis]

On 2023-11-26 10:12, Matthias--- via Cygwin wrote:
> Am Samstag, dem 25.11.2023 um 19:45 +0100 schrieb ASSI via Cygwin:
>> Matthias--- via Cygwin writes:
>>> Yes - That's the reason in my VM too:
>>>     strace ssh-keygen -A
>>>     --- Process 8280 loaded C:\Windows\System32\ntmarta.dll at 00007ffcbc790000
>>>     --- Process 8280 thread 12528 created
>>>     --- Process 8280 thread 15124 created
>>>     --- Process 8280 thread 3324 created
>>>     --- Process 8280, exception c0000005 at 0000000000000000
>>>     --- Process 8280 thread 12528 exited with status 0x0
>>>     --- Process 8280 loaded C:\Windows\System32\kernel.appcore.dll at 00007ffcbb550000
>>>     --- Process 8280 thread 13908 exited with status 0xc0000005
>>>     --- Process 8280 thread 3324 exited with status 0xc0000005
>>>     --- Process 8280 exited with status 0xc0000005
>>>     Segmentation fault

>> I'm fairly certain that this is not Cygwin's ssh-keygen…

> I believe it is Cygwin's ssh-keygen because it is loading cygwin dlls too:
>     strace /usr/bin/ssh-keygen.exe -A
>     --- Process 14116 created
>     --- Process 14116 loaded C:\Windows\System32\ntdll.dll at 00007ffcbff90000
>     --- Process 14116 loaded C:\Windows\System32\kernel32.dll at 00007ffcbe610000
>     --- Process 14116 loaded C:\Windows\System32\KernelBase.dll at 00007ffcbd710000
>     --- Process 14116 loaded C:\Windows\System32\apphelp.dll at 00007ffcbaea0000
>     --- Process 14116 loaded C:\cygwin64\bin\cygcrypto-3.dll at 00000003ff8c0000
>     --- Process 14116 loaded C:\cygwin64\bin\cygwin1.dll at 00007ffc74c90000
>     --- Process 14116 loaded C:\cygwin64\bin\cyggcc_s-seh-1.dll at 00000003ff790000
>     --- Process 14116 loaded C:\cygwin64\bin\cygz.dll at 00000003feb50000
>         1       1 [main] ssh-keygen (14116) **********************************************
>       279     280 [main] ssh-keygen (14116) Program name: C:\cygwin64\bin\ssh-keygen.exe (windows pid
>     14116)
>       190     470 [main] ssh-keygen (14116) OS version:   Windows NT-10.0
>       125     595 [main] ssh-keygen (14116) **********************************************
>     --- Process 14116 loaded C:\Windows\System32\advapi32.dll at 00007ffcbfac0000
>     :
>     --- Process 14116 loaded C:\Windows\System32\ntmarta.dll at 00007ffcbc790000
>     --- Process 14116 thread 15044 created
>     --- Process 14116 thread 10544 created
>     --- Process 14116 thread 13588 created
>     --- Process 14116, exception c0000005 at 0000000000000000
>     --- Process 14116 thread 15044 exited with status 0x0
>     --- Process 14116 thread 10544 exited with status 0xc0000005
>     --- Process 14116 thread 14316 exited with status 0xc0000005
>     --- Process 14116 exited with status 0xc0000005
>     Segmentation fault
> 
> The Windows OpenSSH-Client is also installed in my VM:
>     strace /cygdrive/C/Windows/System32/OpenSSH/ssh-keygen.exe -A
>     --- Process 12532 created
>     --- Process 12532 loaded C:\Windows\System32\ntdll.dll at 00007ffcbff90000
>     --- Process 12532 loaded C:\Windows\System32\kernel32.dll at 00007ffcbe610000
>     --- Process 12532 loaded C:\Windows\System32\KernelBase.dll at 00007ffcbd710000
>     --- Process 12532 loaded C:\Windows\System32\apphelp.dll at 00007ffcbaea0000
>     :
>     --- Process 12532 loaded C:\Windows\System32\winrnr.dll at 00007ffc77150000
>     ssh-keygen: generating new host keys: RSA DSA ECDSA ED25519
>     --- Process 12532 unloaded DLL at 00007ffc77110000
>     :
>     and all keys are created in C:\ProgramData\ssh
> 
> So it looks like cygwin ssh-keygen.exe have a problem :(
> BTW: similar Segmentation faults I have with "strace /usr/sbin/sshd.exe --help" as well as with
> "strace /usr/bin/ssh.exe --help".
> Both are loading cygwin dlls like cygcrypt-2.dll or cygiconv-2.dll as well as Windows dlls like
> ntdll.dll or kernel32.dll.
> 
> Any hints?

That intercept does not run under strace on my Win 10 latest patches system.
My strace shows DHCP contacted before running gethostname, then keygens.

Does this system run a legacy A/V?

Add to BLODA? - legacy embedded security provider interface:

https://learn.microsoft.com/en-us/previous-versions/windows/embedded/aa939264(v=winembedded.5)?redirectedfrom=MSDN

-- 
Take care. Thanks, Brian Inglis              Calgary, Alberta, Canada

La perfection est atteinte                   Perfection is achieved
non pas lorsqu'il n'y a plus rien à ajouter  not when there is no more to add
mais lorsqu'il n'y a plus rien à retirer     but when there is no more to cut
                                 -- Antoine de Saint-Exupéry