[Proftpd-user] SFTP check-file extension

Hi all,

I'm using ProFTPD Version 1.3.5a on a Ubuntu 16.04 machine. I want to check the remote files hash and compare with the local ones to choose weather or no to download them.

I have this config:


<IfModule mod_sftp.c>

SFTPEngine on
Port 2222
SFTPLog /var/log/proftpd/sftp.log

# Configure both the RSA and DSA host keys, using the same host key
# files that OpenSSH uses.
SFTPHostKey /etc/ssh/ssh_host_rsa_key
SFTPHostKey /etc/ssh/ssh_host_dsa_key

SFTPAuthMethods publickey

SFTPAuthorizedUserKeys file:/etc/proftpd/authorized_keys/%u

# Enable compression
SFTPCompression delayed

SFTPExtensions +checkFile

</IfModule>

I know that checkFile extension should be available by default, but I'm hitting this error:


2018-10-30 18:32:09,989 mod_sftp/0.9.9[869]: sent server version 'SSH-2.0-mod_sftp/0.9.9'
2018-10-30 18:32:09,990 mod_sftp/0.9.9[869]: received client version 'SSH-2.0-paramiko_2.4.2'
2018-10-30 18:32:09,990 mod_sftp/0.9.9[869]: handling connection from SSH2 client 'paramiko_2.4.2'
2018-10-30 18:32:09,990 mod_sftp/0.9.9[869]: + Session key exchange: ecdh-sha2-nistp256
2018-10-30 18:32:09,990 mod_sftp/0.9.9[869]: + Session server hostkey: ssh-rsa
2018-10-30 18:32:09,990 mod_sftp/0.9.9[869]: + Session client-to-server encryption: aes128-ctr
2018-10-30 18:32:09,990 mod_sftp/0.9.9[869]: + Session server-to-client encryption: aes128-ctr
2018-10-30 18:32:09,990 mod_sftp/0.9.9[869]: + Session client-to-server MAC: hmac-sha2-256
2018-10-30 18:32:09,990 mod_sftp/0.9.9[869]: + Session server-to-client MAC: hmac-sha2-256
2018-10-30 18:32:09,990 mod_sftp/0.9.9[869]: + Session client-to-server compression: none
2018-10-30 18:32:09,990 mod_sftp/0.9.9[869]: + Session server-to-client compression: none
2018-10-30 18:32:10,081 mod_sftp/0.9.9[869]: public key MD5 fingerprint: [redacted]
2018-10-30 18:32:10,084 mod_sftp/0.9.9[869]: sending userauth success
2018-10-30 18:32:10,084 mod_sftp/0.9.9[869]: user 'ubuntu' authenticated via 'publickey' method
2018-10-30 18:32:10,086 mod_sftp/0.9.9[869]: 'subsystem' channel request for 'sftp' subsystem
2018-10-30 18:32:10,088 mod_sftp/0.9.9[869]: using SFTP protocol version 3 for this session (channel ID 0)
2018-10-30 18:32:10,104 mod_sftp/0.9.9[869]: client requested 'check-file' extension, rejecting
2018-10-30 18:32:10,205 mod_sftp/0.9.9[869]: disconnecting client (received EOF)
2018-10-30 18:32:10,206 mod_sftp/0.9.9[869]: aborting 1 unclosed file handle

I've added SFTPExtensions +checkFile to be sure the extension was enabled... do any of you know why it's rejecting? Other operations on the file like reading line or renaming works fine.

Thanks,
Miguel


[Cyan Connode Logo]<http://www.cyanconnode.com> [Cyan Connode Logo]

Miguel Aveiro
Senior Software Engineer

+44 (0)1223 225060

www.cyanconnode.com<http://www.cyanconnode.com>


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