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Install Pure-FTPd with OpenLDAP backend on RHEL/CentOS

Install Pure-FTPd

Install PureFTPD from EPEL yum repo:

# yum install pure-ftpd

Use a proper LDAP bind dn/password to query accounts

iRedMail generates a LDAP bind dn cn=vmail,dc=xxx,dc=xxx with read-only access to all mail accounts, we use it in ejabberd to query accounts.

Password of cn=vmail,dc=xxx,dc=xxx was generated randomly during iRedMail installation, you can find the full dn and password in /etc/postfix/ldap/catchall_maps.cf:

# grep 'bind_' /etc/postfix/ldap/catchall_maps.cf
bind_dn         = cn=vmail,dc=example,dc=com
bind_pw         = InYTi8qGjamTb6Me2ESwbb6rxQUs5y

Configure the LDAP setting for PureFTPD

• Open /etc/pure-ftpd/pureftpd-ldap.conf and update below parameters:

LDAPServer localhost
LDAPPort 389
LDAPBaseDN o=domains,dc=example,dc=com
LDAPBindDN cn=vmail,dc=example,dc=com
LDAPBindPW InYTi8qGjamTb6Me2ESwbb6rxQUs5y       # cn=vmail password 
LDAPDefaultUID 2000                             # <- UID of `vmail` user.
LDAPDefaultGID 2000                             # <- GID of `vmail` user.
LDAPFilter (&(objectClass=PureFTPdUser)(mail=\L)(FTPStatus=enabled))
LDAPHomeDir FTPHomeDir                          # <- New LDAP attribute, we will add it later.
LDAPVersion 3

Config OpenLDAP

• Get the schema modify by iredmail

# wget https://bitbucket.org/zhb/iredmail/raw/default/extra/samples/pureftpd.schema
# mv pureftpd.schema /etc/openldap/schema/ 

• Open /etc/openldap/slapd.conf, include pureftpd.schema after iredmail.schema:

include /etc/openldap/schema/iredmail.schema
include /etc/openldap/schema/pureftpd.schema    # <-- Add this line.

• Open /etc/openldap/slapd.conf, append required indexes for attributes defined in pureftpd.schema:

# Indexes for Pure-FTPd LDAP attributes.
index FTPQuotaFiles,FTPQuotaMBytes eq,pres
index FTPUploadRatio,FTPDownloadRatio eq,pres
index FTPUploadBandwidth,FTPDownloadBandwidth eq,pres
index FTPStatus,FTPuid,FTPgid,FTPHomeDir eq,pres

Create FTP Home Directory

We're going to store all FTP data under /home/ftp/ directory, so let's create /home/ftp/ now, owner must be root user.

# mkdir /home/ftp/
# ls -dl /home/ftp
drwxr-xr-x 3 root root 4096 Jun  7 20:18 /home/ftp/

Restart OpenLDAP and Pure-FTPD Service

Make sure pure-ftpd is running:

# /etc/init.d/ldap restart
# /etc/init.d/pure-ftpd restart 

# netstat -ntlp | grep pure-ftpd
tcp 0   0 0.0.0.0:21    0.0.0.0:*   LISTEN  2062/pure-ftpd (SERVER)
tcp 0   0 :::21         :::*        LISTEN  2062/pure-ftpd (SERVER)

Add LDAP FTP attributes and values for new user

use the iredmail tools quick create the user include the PureFTP attributes and values.

• Open /iRedMail-x.y.z/tools/create_mail_user_OpenLDAP.sh and set correct values:

LDAP_SUFFIX="dc=example,dc=com" # <- Change the LDAP suffix 
BINDPW='passwd'                 # <- Password for the bind dn `cn=Manager,dc=example,dc=com`
PUREFTPD_INTEGRATION='YES'      # <- Change to YES, enable the pureftp inteegration

• Run the script to create a new user user1@example.com. The default password is same as user name (user1) by default.

# bash create_mail_user_OpenLDAP.sh example.com user1

adding new entry "ou=Users,domainName=example.com,o=domains,dc=example,dc=com"
ldapadd: Already exists (68)
adding new entry "ou=Groups,domainName=example.com,o=domains,dc=example,dc=com"
ldapadd: Already exists (68)
adding new entry "ou=Aliases,domainName=example.com,o=domains,dc=example,dc=com"
ldapadd: Already exists (68)
adding new entry "mail=user1@example.com,ou=Users,domainName=example.com,o=domains,dc=example,dc=com"

Configure iptables

iRedMail doesn't open port 20 and 21 by default, you must open them first.

• Open /etc/sysconfig/iptables and set correct values:

-A INPUT -p tcp --dport 20 -j ACCEPT
-A INPUT -p tcp --dport 21 -j ACCEPT

• Restart the iptables service

# /etc/init.d/iptables restart 

Testing

You can use windows FTP client or Linux ftp client (e.g. command line ftp client lftp or GUI client FileZilla) for testing.

$ lftp localhost
localhost:~> debug 4
localhost:~> login user1@example.com user1 # <-- input the username and password
user1@example.com@localhost:~> ls 
---- Connecting to localhost (127.0.0.1) port 21
<--- 220---------- Welcome to Pure-FTPd [privsep] [TLS] ----------
<--- 220-You are user number 1 of 50 allowed.
<--- 220-Local time is now 16:25. Server port: 21.
<--- 220-IPv6 connections are also welcome on this server.
<--- 220 You will be disconnected after 15 minutes of inactivity.
<--- 211-Extensions supported:
<---  EPRT
<---  IDLE
<---  MDTM
<---  SIZE
<---  REST STREAM
<---  MLST type*;size*;sizd*;modify*;UNIX.mode*;UNIX.uid*;UNIX.gid*;unique*;
<---  MLSD
<---  ESTP
<---  PASV
<---  EPSV
<---  SPSV
<---  ESTA
<---  AUTH TLS
<---  PBSZ
<---  PROT
<---  UTF8
<--- 211 End.
<--- 500 This security scheme is not implemented
<--- 200 OK, UTF-8 enabled
<--- 200  MLST OPTS type;size;sizd;modify;UNIX.mode;UNIX.uid;UNIX.gid;unique;
<--- 331 User user1@example.com OK. Password required
<--- 230-Your bandwidth usage is restricted
<--- 230-User user1@example.com has group access to:  vmail   
<--- 230-You must respect a 1:5 (UL/DL) ratio
<--- 230-OK. Current restricted directory is /
<--- 230-0 files used (0%) - authorized: 50 files
<--- 230 0 Kbytes used (0%) - authorized: 10240 Kb
<--- 257 "/" is your current location
<--- 227 Entering Passive Mode (127,0,0,1,32,58)
<--- 150 Accepted data connection
drwxr-xr-x    2 500      vmail        4096 Jun 10 16:16 .
drwxr-xr-x    2 500      vmail        4096 Jun 10 16:16 ..
-rw-------    1 500      vmail           0 Jun 10 16:16 .ftpquota

Troubleshooting

Enable verbose log in pure-ftpd

• Open /etc/pure-ftpd/pure-ftpd.conf and set correct values:

VerboseLog                  yes # <-- change form no to yes 

• Open /etc/syslog.conf and set correct values:

ftp.*                       -/var/log/pureftpd.log # <-- Add entry

• Restart services

#/etc/init.d/pure-ftpd restart
#/etc/init.d/syslog restart

Monitor /var/log/pureftpd.log for troubleshooting:

# tail -0f /var/log/pureftpd.log

If you need to debug OpenLDAP, please refer to another document: Debug OpenLDAP.

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