SFTP logging: is there a way?

OpenSSH versions 4.4p1 and up (which should include the latest version with CentOS 5) have SFTP logging capability built in – you just need to configure it.

Find this in your sshd_config (in centos, file /etc/ssh/sshd_config):

Subsystem       sftp    /usr/libexec/openssh/sftp-server

and change it to:

Subsystem       sftp    /usr/libexec/openssh/sftp-server -l INFO

INFO is just one level of detail over what you’re seeing by default – it provides detailed information regarding file transfers, permission changes, etc. If you need more info, you can adjust the log level accordingly. The various levels (in order of detail) are:

QUIET, FATAL, ERROR, INFO, VERBOSE, DEBUG, DEBUG1, DEBUG2, and DEBUG3

Anything over VERBOSE is probably more information than you’re looking for, but it might be useful.

Finally restart the SSH service to update the changes (centos):

systemctl restart sshd

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