Bug#1131161: proftpd-mod-crypto: SFTPExtensions +checkFile does not enable check-file

[Jörg Eichhorn]

Ahoi,


> At [1] I can read "All extensions except vendorID and xattr are enabled 
> by default." The page reports more extensions, than these from your log 
> file, e.g. limits. I'm not sure if the log is complete.

I'm not sure, how the release and the documentation fit each other, 
since 1.3.8 won't accept "userGroupNames".

```
2026-03-23 11:43:39,874 test-vm3 proftpd[66933]: fatal: SFTPExtensions: 
unknown extension: 'userGroupNames' on line 13 of '/etc/proftpd/sftp.conf'
```

Testing against 1.3.9 from debian testing, as suggested, the list looks 
way more complete. See below.

 >> When using paramiko.sftp_file.SFTPFile.check anyways - the request
 >> won't be accepted:
 >>
 >
 > I guess this your proof that, that the extension is really not
 > activated, right?

Yes this was my intention. But testing against 1.3.9 it did not work 
either. So I've tested again using bitvise ssh client - proftpd 
calculates checksums as intended. Works even in 1.3.8 as in trixie, 
though not listing the feature.
So no issue here.

Thanks for pointing into the right direction.

Best, Joerg




```
2026-03-23 09:35:59,220 [1572] <sftp:7>: received request: INIT 3
2026-03-23 09:35:59,220 [1572] <sftp:8>: sending response: VERSION 3
2026-03-23 09:35:59,220 [1572] <sftp:11>: + SFTP extension: versions = 
'2,3,4,5,6'
2026-03-23 09:35:59,220 [1572] <sftp:11>: + SFTP extension: check-file = '1'
2026-03-23 09:35:59,220 [1572] <sftp:11>: + SFTP extension: copy-file = '1'
2026-03-23 09:35:59,220 [1572] <sftp:11>: + SFTP extension: 
home-directory = '1'
2026-03-23 09:35:59,220 [1572] <sftp:11>: + SFTP extension: 
space-available = '1'
2026-03-23 09:35:59,220 [1572] <sftp:11>: + SFTP extension: vendor-id = 
{ vendorName = 'ProFTPD Project', productName = 'mod_sftp', 
productVersion = 'mod_sftp/1.2.0', buildNumber = 16976132 }
2026-03-23 09:35:59,220 [1572] <sftp:11>: + SFTP extension: 
fsync at openssh.com = '1'
2026-03-23 09:35:59,220 [1572] <sftp:11>: + SFTP extension: 
posix-rename at openssh.com = '1'
2026-03-23 09:35:59,220 [1572] <sftp:11>: + SFTP extension: 
statvfs at openssh.com = '2'
2026-03-23 09:35:59,220 [1572] <sftp:11>: + SFTP extension: 
fstatvfs at openssh.com = '2'
2026-03-23 09:35:59,220 [1572] <sftp:11>: + SFTP extension: 
hardlink at openssh.com = '1'
2026-03-23 09:35:59,220 [1572] <sftp:11>: + SFTP extension: 
limits at openssh.com = '1'
2026-03-23 09:35:59,220 [1572] <sftp:11>: + SFTP extension: 
users-groups-by-id at openssh.com = '1'
2026-03-23 09:35:59,220 [1572] <sftp:11>: + SFTP extension: 
xattr at proftpd.org = '1'
2026-03-23 09:35:59,220 [1572] <encode:5>: decoded 'INIT' into 'INIT'
```


> 

> Before opening a bug at upstream: do you have an unstable installation 
> running 1.3.9 and could test if the issue is solved there? If needed I 
> can provide backports for Debian stable.
> 
> Hilmar
> 
> [1] http://www.proftpd.org/docs/contrib/mod_sftp.html#SFTPExtensions