The path to the file holding the credentials to access the web interface. If unset no authentication will be required.
The file must contain user names and password hashes in the format username:hash, one for each line. Usernames must start with a lowecase ([a-z]) ASCII character, might contain non-consecutive underscores except at the end, and consists of small-case a-z characters and digits 0-9. The htpasswd tool from the apacheHttpd package may be used to generate the hash: htpasswd -bnBC 12 username password.