Chapter 7. FTP configuration

Table of Contents

7.1. Per-domain authentication
7.2. Multi-user authentication
7.3. Other forms of authentication
7.4. Quotas
7.5. FTP configuration layout

FTP users can be authenticated in two ways: on a per-domain basis, or on a per-user-per-domain basis. It is possible to enable other forms of authentication too.

7.1. Per-domain authentication

Basic per-domain authentication is controlled by the config/ftp-password file. This file contains the plain-text or hashed password for the FTP user whose username is the domain name. This user is limited to accessing the public directory for that domain.

For example, /srv/ contains the password for the FTP user, and that user will be limited to accessing /srv/

7.2. Multi-user authentication

This authentication method is controlled by the config/ftp-users file. This file contains more than just the password. Each line in the file represents a different user, and contains the username, password, base directory, and quota. Comments in the file start with #.

# username:password:directory:quota
bab:babs password:/path/to/base:10M

The directory and quota fields are optional. If the password field is empty, the user will not be able to log in.

In the above example, if that file was kept at /srv/ then the user babs@my-brilliant-site would be able to log in with the password babs password. She’d be limited to the accessing files and directories below /path/to/base, and uploads to that that directory would be prohibited if it contains more than 10 Megabytes of data.

7.3. Other forms of authentication

It is possible to use the other forms of authentication provided by Pure-FTPd. The Pure-FTPd manual gives a good run down of all the various ways to do it. Here the two most common ways have been documented.

PureDB authentication

To enable authentication for virtual users, but would rather not use the Symbiosis method, you can create a Pure FTPd authentication DB, and use that. To tell the server to authenticate against it, you can run the following commands, as root.

echo /etc/pure-ftpd/pureftpd.pdb > /etc/pure-ftpd/conf/PureDB
touch /etc/pure-ftpd/pureftpd.pdb
ln -s /etc/pure-ftpd/conf/PureDB /etc/pure-ftpd/auth/50puredb
service pure-ftpd restart

Then you can use the pure-pw command to add new users. For example to add the user foo, you can run:

pure-pw useradd foo -u 1000 -g 1000 -d /path/to/home -m

It will prompt you for the password, and then rebuild the password file /etc/pure-ftpd/pureftpd.pdb automatically.

Pam authentication

If you would like to add normal PAM authentication, then you can run the following commands as root.

echo 1 > /etc/pure-ftpd/conf/PAMAuthentication
ln -s /etc/pure-ftpd/conf/PAMAuthentication /etc/pure-ftpd/auth/50pam
serivce pure-ftpd restart

Normal UNIX users should be able to log in now with their standard passwords.

7.4. Quotas

There are two ways of specifying a quota. The default quota for a domain goes in config/ftp-quota. This controls the quota for the per-domain user in public, as well as the default quota for users specified in config/ftp-users. Its format is the same as that for email quotas.

For the multi-user configuration file, a user’s quota can be specified in the final field, again in the same format as that used for email quotas.

7.5. FTP configuration layout

Domain-wide FTP user’s password.
Default FTP quota for the domain.
Per-user configuration for a domain.