ProFTPd LDAP authentication doesn't show up

UCS - Univention Corporate Server
,
#1

Hi,

I installed proftpd using this article, today.
https://wiki.univention.de/index.php/Cool_Solution_-_Install_ProFTP_and_setup_ldap_authentication

Unfortunatelly, every user gets an incorrect login response.

Attached is the log of my login attemp.
I can see all kinds of mod_*, but no mod_ldap shows up.

Would be perfect to get a hint, where to look for, or how to debug this problem.
Scan2SMB doesn’t work on Kyocera printers very reliable and that’s the reason why I need ftp. :wink:

Thanks in advanced,
Christian.

2018-04-18 13:38:13,742 datengrube proftpd[7127] datengrube.onex.local (baileys.onex.local[192.168.250.100]): dispatching PRE_CMD command 'USER christian' to mod_exec
2018-04-18 13:38:13,743 datengrube proftpd[7127] datengrube.onex.local (baileys.onex.local[192.168.250.100]): dispatching PRE_CMD command 'USER christian' to mod_rewrite
2018-04-18 13:38:13,743 datengrube proftpd[7127] datengrube.onex.local (baileys.onex.local[192.168.250.100]): dispatching PRE_CMD command 'USER christian' to mod_tls
2018-04-18 13:38:13,743 datengrube proftpd[7127] datengrube.onex.local (baileys.onex.local[192.168.250.100]): dispatching PRE_CMD command 'USER christian' to mod_core
2018-04-18 13:38:13,743 datengrube proftpd[7127] datengrube.onex.local (baileys.onex.local[192.168.250.100]): dispatching PRE_CMD command 'USER christian' to mod_core
2018-04-18 13:38:13,744 datengrube proftpd[7127] datengrube.onex.local (baileys.onex.local[192.168.250.100]): dispatching PRE_CMD command 'USER christian' to mod_delay
2018-04-18 13:38:13,744 datengrube proftpd[7127] datengrube.onex.local (baileys.onex.local[192.168.250.100]): dispatching PRE_CMD command 'USER christian' to mod_auth
2018-04-18 13:38:13,744 datengrube proftpd[7127] datengrube.onex.local (baileys.onex.local[192.168.250.100]): dispatching CMD command 'USER christian' to mod_ratio
2018-04-18 13:38:13,744 datengrube proftpd[7127] datengrube.onex.local (baileys.onex.local[192.168.250.100]): dispatching CMD command 'USER christian' to mod_auth
2018-04-18 13:38:13,744 datengrube proftpd[7127] datengrube.onex.local (baileys.onex.local[192.168.250.100]): dispatching POST_CMD command 'USER christian' to mod_exec
2018-04-18 13:38:13,744 datengrube proftpd[7127] datengrube.onex.local (baileys.onex.local[192.168.250.100]): dispatching POST_CMD command 'USER christian' to mod_delay
2018-04-18 13:38:13,745 datengrube proftpd[7127] datengrube.onex.local (baileys.onex.local[192.168.250.100]): dispatching LOG_CMD command 'USER christian' to mod_log
2018-04-18 13:38:19,517 datengrube proftpd[7127] datengrube.onex.local (baileys.onex.local[192.168.250.100]): dispatching PRE_CMD command 'PASS (hidden)' to mod_exec
2018-04-18 13:38:19,517 datengrube proftpd[7127] datengrube.onex.local (baileys.onex.local[192.168.250.100]): dispatching PRE_CMD command 'PASS (hidden)' to mod_rewrite
2018-04-18 13:38:19,517 datengrube proftpd[7127] datengrube.onex.local (baileys.onex.local[192.168.250.100]): dispatching PRE_CMD command 'PASS (hidden)' to mod_tls
2018-04-18 13:38:19,517 datengrube proftpd[7127] datengrube.onex.local (baileys.onex.local[192.168.250.100]): dispatching PRE_CMD command 'PASS (hidden)' to mod_core
2018-04-18 13:38:19,517 datengrube proftpd[7127] datengrube.onex.local (baileys.onex.local[192.168.250.100]): dispatching PRE_CMD command 'PASS (hidden)' to mod_core
2018-04-18 13:38:19,518 datengrube proftpd[7127] datengrube.onex.local (baileys.onex.local[192.168.250.100]): dispatching PRE_CMD command 'PASS (hidden)' to mod_ifsession
2018-04-18 13:38:19,531 datengrube proftpd[7127] datengrube.onex.local (baileys.onex.local[192.168.250.100]): dispatching PRE_CMD command 'PASS (hidden)' to mod_shaper
2018-04-18 13:38:19,531 datengrube proftpd[7127] datengrube.onex.local (baileys.onex.local[192.168.250.100]): ROOT PRIVS at mod_shaper.c:2026
2018-04-18 13:38:19,531 datengrube proftpd[7127] datengrube.onex.local (baileys.onex.local[192.168.250.100]): RELINQUISH PRIVS at mod_shaper.c:2028
2018-04-18 13:38:19,531 datengrube proftpd[7127] datengrube.onex.local (baileys.onex.local[192.168.250.100]): dispatching PRE_CMD command 'PASS (hidden)' to mod_wrap2
2018-04-18 13:38:19,532 datengrube proftpd[7127] datengrube.onex.local (baileys.onex.local[192.168.250.100]): dispatching PRE_CMD command 'PASS (hidden)' to mod_ban
2018-04-18 13:38:19,532 datengrube proftpd[7127] datengrube.onex.local (baileys.onex.local[192.168.250.100]): dispatching PRE_CMD command 'PASS (hidden)' to mod_wrap
2018-04-18 13:38:19,532 datengrube proftpd[7127] datengrube.onex.local (baileys.onex.local[192.168.250.100]): dispatching PRE_CMD command 'PASS (hidden)' to mod_radius
2018-04-18 13:38:19,532 datengrube proftpd[7127] datengrube.onex.local (baileys.onex.local[192.168.250.100]): dispatching PRE_CMD command 'PASS (hidden)' to mod_delay
2018-04-18 13:38:19,532 datengrube proftpd[7127] datengrube.onex.local (baileys.onex.local[192.168.250.100]): dispatching PRE_CMD command 'PASS (hidden)' to mod_auth
2018-04-18 13:38:19,533 datengrube proftpd[7127] datengrube.onex.local (baileys.onex.local[192.168.250.100]): dispatching CMD command 'PASS (hidden)' to mod_auth
2018-04-18 13:38:19,545 datengrube proftpd[7127] datengrube.onex.local (baileys.onex.local[192.168.250.100]): USER christian: no such user found from baileys.onex.local [192.168.250.100] to ::ffff:192.168.250.9:21
2018-04-18 13:38:19,546 datengrube proftpd[7127] datengrube.onex.local (baileys.onex.local[192.168.250.100]): dispatching POST_CMD_ERR command 'PASS (hidden)' to mod_exec
2018-04-18 13:38:19,546 datengrube proftpd[7127] datengrube.onex.local (baileys.onex.local[192.168.250.100]): dispatching POST_CMD_ERR command 'PASS (hidden)' to mod_shaper
2018-04-18 13:38:19,546 datengrube proftpd[7127] datengrube.onex.local (baileys.onex.local[192.168.250.100]): dispatching POST_CMD_ERR command 'PASS (hidden)' to mod_wrap2
2018-04-18 13:38:19,546 datengrube proftpd[7127] datengrube.onex.local (baileys.onex.local[192.168.250.100]): dispatching POST_CMD_ERR command 'PASS (hidden)' to mod_radius
2018-04-18 13:38:19,546 datengrube proftpd[7127] datengrube.onex.local (baileys.onex.local[192.168.250.100]): dispatching POST_CMD_ERR command 'PASS (hidden)' to mod_delay
2018-04-18 13:38:19,546 datengrube proftpd[7127] datengrube.onex.local (baileys.onex.local[192.168.250.100]): dispatching LOG_CMD_ERR command 'PASS (hidden)' to mod_log
2018-04-18 13:38:19,547 datengrube proftpd[7127] datengrube.onex.local (baileys.onex.local[192.168.250.100]): dispatching LOG_CMD_ERR command 'PASS (hidden)' to mod_auth
#2

Hey,

please show us your proftpd configuration file(s).

m.

#3

ldap.conf:

#
# Proftpd sample configuration for LDAP authentication.
#
# (This is not to be used if you prefer a PAM-based LDAP authentication)
#

<IfModule mod_ldap.c>
#
# This is used for ordinary LDAP connections, with or without TLS
#
#LDAPServer ldap://ldap.example.com
#LDAPBindDN "cn=admin,dc=example,dc=com" "admin_password"
#LDAPUsers dc=users,dc=example,dc=com (uid=%u) (uidNumber=%u)
#
# To be set on only for LDAP/TLS on ordinary port, for LDAP+SSL see below
#LDAPUseTLS on
#

#
# This is used for encrypted LDAPS connections
#
#LDAPServer ldaps://ldap.example.com
#LDAPBindDN "cn=admin,dc=example,dc=com" "admin_password"
#LDAPUsers dc=users,dc=example,dc=com (uid=%u) (uidNumber=%u)
#

LDAPServer ldaps://master.onex.local:7636/??sub
LDAPBindDN "uid=proftp,cn=users,dc=onex,dc=local" "password for user proftp"
LDAPUsers "cn=users,dc=onex,dc=local" "(&(uid=%v)(objectclass=posixAccount))"

</IfModule>

proftpd.conf:

#
# /etc/proftpd/proftpd.conf -- This is a basic ProFTPD configuration file.
# To really apply changes, reload proftpd after modifications, if
# it runs in daemon mode. It is not required in inetd/xinetd mode.
#

# Includes DSO modules
Include /etc/proftpd/modules.conf

# Set off to disable IPv6 support which is annoying on IPv4 only boxes.
UseIPv6                         on
# If set on you can experience a longer connection delay in many cases.
IdentLookups                    off

ServerName                      "Datengrube"
ServerType                      standalone
DeferWelcome                    off

MultilineRFC2228                on
DefaultServer                   on
ShowSymlinks                    on

TimeoutNoTransfer               600
TimeoutStalled                  600
TimeoutIdle                     1200

DisplayLogin                    welcome.msg
DisplayChdir                    .message true
ListOptions                     "-l"

DenyFilter                      \*.*/

# Use this to jail all users in their homes
# DefaultRoot                   ~

# Users require a valid shell listed in /etc/shells to login.
# Use this directive to release that constrain.
# RequireValidShell             off

# Port 21 is the standard FTP port.
Port                            21

# In some cases you have to specify passive ports range to by-pass
# firewall limitations. Ephemeral ports can be used for that, but
# feel free to use a more narrow range.
PassivePorts                  49152 65534

# If your host was NATted, this option is useful in order to
# allow passive tranfers to work. You have to use your public
# address and opening the passive ports used on your firewall as well.
# MasqueradeAddress             1.2.3.4

# This is useful for masquerading address with dynamic IPs:
# refresh any configured MasqueradeAddress directives every 8 hours
<IfModule mod_dynmasq.c>
# DynMasqRefresh 28800
</IfModule>

# To prevent DoS attacks, set the maximum number of child processes
# to 30.  If you need to allow more than 30 concurrent connections
# at once, simply increase this value.  Note that this ONLY works
# in standalone mode, in inetd mode you should use an inetd server
# that allows you to limit maximum number of processes per service
# (such as xinetd)
MaxInstances                    30

# Set the user and group that the server normally runs at.
User                            proftpd
Group                           nogroup

# Umask 022 is a good standard umask to prevent new files and dirs
# (second parm) from being group and world writable.
Umask                           022  022
# Normally, we want files to be overwriteable.
AllowOverwrite                  on

# Uncomment this if you are using NIS or LDAP via NSS to retrieve passwords:
# PersistentPasswd              off

# This is required to use both PAM-based authentication and local passwords
# AuthOrder                     mod_auth_pam.c* mod_auth_unix.c
AuthOrder mod_ldap.c

# Be warned: use of this directive impacts CPU average load!
# Uncomment this if you like to see progress and transfer rate with ftpwho
# in downloads. That is not needed for uploads rates.
#
# UseSendFile                   off

TransferLog /var/log/proftpd/xferlog
SystemLog   /var/log/proftpd/proftpd.log

# Logging onto /var/log/lastlog is enabled but set to off by default
#UseLastlog on

# In order to keep log file dates consistent after chroot, use timezone info
# from /etc/localtime.  If this is not set, and proftpd is configured to
# chroot (e.g. DefaultRoot or <Anonymous>), it will use the non-daylight
# savings timezone regardless of whether DST is in effect.
#SetEnv TZ :/etc/localtime

<IfModule mod_quotatab.c>
QuotaEngine off
</IfModule>

<IfModule mod_ratio.c>
Ratios off
</IfModule>


# Delay engine reduces impact of the so-called Timing Attack described in
# http://www.securityfocus.com/bid/11430/discuss
# It is on by default.
<IfModule mod_delay.c>
DelayEngine on
</IfModule>

<IfModule mod_ctrls.c>
ControlsEngine        off
ControlsMaxClients    2
ControlsLog           /var/log/proftpd/controls.log
ControlsInterval      5
ControlsSocket        /var/run/proftpd/proftpd.sock
</IfModule>

<IfModule mod_ctrls_admin.c>
AdminControlsEngine off
</IfModule>

#
# Alternative authentication frameworks
#
Include /etc/proftpd/ldap.conf
#Include /etc/proftpd/sql.conf

# 
# This is used for FTPS connections
# 
#Include /etc/proftpd/tls.conf

# 
# Useful to keep VirtualHost/VirtualRoot directives separated
#
#Include /etc/proftpd/virtuals.conf

# A basic anonymous configuration, no upload directories.

# <Anonymous ~ftp>
#   User                                ftp
#   Group                               nogroup
#   # We want clients to be able to login with "anonymous" as well as "ftp"
#   UserAlias                   anonymous ftp
#   # Cosmetic changes, all files belongs to ftp user
#   DirFakeUser on ftp
#   DirFakeGroup on ftp
#
#   RequireValidShell           off
#
#   # Limit the maximum number of anonymous logins
#   MaxClients                  10
# 
#   # We want 'welcome.msg' displayed at login, and '.message' displayed
#   # in each newly chdired directory.
#   DisplayLogin                        welcome.msg
#   DisplayChdir                .message
#
#   # Limit WRITE everywhere in the anonymous chroot
#   <Directory *>
#     <Limit WRITE>
#       DenyAll
#     </Limit>
#   </Directory>
#
#   # Uncomment this if you're brave.
#   # <Directory incoming>
#   #   # Umask 022 is a good standard umask to prevent new files and dirs
#   #   # (second parm) from being group and world writable.
#   #   Umask                           022  022
#   #            <Limit READ WRITE>
#   #            DenyAll
#   #            </Limit>
#   #            <Limit STOR>
#   #            AllowAll
#   #            </Limit>
#   # </Directory>
#
# </Anonymous>

# Include other custom configuration files
Include /etc/proftpd/conf.d/

modules.conf:

#
# This file is used to manage DSO modules and features.
#

# This is the directory where DSO modules reside

ModulePath /usr/lib/proftpd

# Allow only user root to load and unload modules, but allow everyone
# to see which modules have been loaded

ModuleControlsACLs insmod,rmmod allow user root
ModuleControlsACLs lsmod allow user *

LoadModule mod_ctrls_admin.c
LoadModule mod_tls.c

# Install one of proftpd-mod-mysql, proftpd-mod-pgsql or any other
# SQL backend engine to use this module and the required backend.
# This module must be mandatory loaded before anyone of
# the existent SQL backeds.
#LoadModule mod_sql.c

# Install proftpd-mod-ldap to use this
LoadModule mod_ldap.c

#
# 'SQLBackend mysql' or 'SQLBackend postgres' (or any other valid backend) directives
# are required to have SQL authorization working. You can also comment out the
# unused module here, in alternative.
#

# Install proftpd-mod-mysql and decomment the previous
# mod_sql.c module to use this.
#LoadModule mod_sql_mysql.c

# Install proftpd-mod-pgsql and decomment the previous
# mod_sql.c module to use this.
#LoadModule mod_sql_postgres.c

# Install proftpd-mod-sqlite and decomment the previous
# mod_sql.c module to use this
#LoadModule mod_sql_sqlite.c

# Install proftpd-mod-odbc and decomment the previous
# mod_sql.c module to use this
#LoadModule mod_sql_odbc.c

# Install one of the previous SQL backends and decomment
# the previous mod_sql.c module to use this
#LoadModule mod_sql_passwd.c

LoadModule mod_radius.c
LoadModule mod_quotatab.c
LoadModule mod_quotatab_file.c

# Install proftpd-mod-ldap to use this
#LoadModule mod_quotatab_ldap.c

# Install one of the previous SQL backends and decomment
# the previous mod_sql.c module to use this
#LoadModule mod_quotatab_sql.c
LoadModule mod_quotatab_radius.c
LoadModule mod_wrap.c
LoadModule mod_rewrite.c
LoadModule mod_load.c
LoadModule mod_ban.c
LoadModule mod_wrap2.c
LoadModule mod_wrap2_file.c
# Install one of the previous SQL backends and decomment
# the previous mod_sql.c module to use this
#LoadModule mod_wrap2_sql.c
LoadModule mod_dynmasq.c
LoadModule mod_exec.c
LoadModule mod_shaper.c
LoadModule mod_ratio.c
LoadModule mod_site_misc.c

LoadModule mod_sftp.c
LoadModule mod_sftp_pam.c
# Install one of the previous SQL backends and decomment
# the previous mod_sql.c module to use this
#LoadModule mod_sftp_sql.c

LoadModule mod_facl.c
LoadModule mod_unique_id.c
LoadModule mod_copy.c
LoadModule mod_deflate.c
LoadModule mod_ifversion.c
LoadModule mod_tls_memcache.c

# Install proftpd-mod-geoip to use the GeoIP feature
#LoadModule mod_geoip.c

# keep this module the last one
LoadModule mod_ifsession.c
#4

Hey,

your configuration looks good to me and works just fine on my 4.3 test installation. I’m not sure why it wouldn’t work on 4.2 — one possible reason might be that the user’s home directory doesn’t exist.

The question remains, though, why you’re trying to use ProFTPd with LDAP support instead of its PAM support. For me ProFTPd works out of the box on UCS 4.2 with PAM — meaning I install it and can immediately log in as a regular user. In that setup ProFTPd will look up the user account via NSS and try to authenticate via PAM. The default PAM configuration for ProFTPd is the default system PAM configuration, meaning LDAP lookups & binds.

Another advantage of using the PAM variant is that home directories will be mounted (if so configured) or created if they don’t exist yet (see /etc/pam.d/common-session).

Kind regards,
mosu

1 Like
#5

cool idea! :wink:
tyvm for your help.

Mastodon