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server-side FTP tweaks ...

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#1 Tue, 04/10/2012 - 21:48

Gary

server-side FTP tweaks ...

hi,

wondering if there's a simple way to tweak FTP response of a VM server, in terms of - you might say - the "persistence" of the connection.

using Dreamweaver for my sites; FTP connection seems to get 'stuck on' but loses it live connection after a short period of non-use. Is there any way of either lengthening the time window of the active connection, or else forcing a disconnect after, say 30 sec of non-activity?

I've tried all the possible combination of FTP settings on the dreamweaver end, but nothing seems to work.

thanks for any suggestions ...

Gary

#2 Tue, 04/10/2012 - 22:06

andreychek

Howdy,

You could try editing /etc/proftpd/proftpd.conf, and tweak the "TimeoutIdle" setting.

It's set to 600 seconds by default on my distro, but you could lower that to 30.

-Eric

#3 Thu, 04/12/2012 - 03:27

Gary

hi Andreychek,

the "Timeoutidle" parameter does not seem to exist in my file, which was located under "etc" (no folder called "proftpd") ...

Here's the content of the file, is there any other parameter that might work? Thanks!

Gary

# This is the ProFTPD configuration file
#
# See: http://www.proftpd.org/docs/directives/linked/by-name.html
 
# Server Config - config used for anything outside a <VirtualHost> or <Global> context
# See: http://www.proftpd.org/docs/howto/Vhost.html
 
ServerName          "ProFTPD server"
ServerIdent         on "FTP Server ready."
ServerAdmin         root@localhost
DefaultServer           on
 
# Cause every FTP user except adm to be chrooted into their home directory
# Aliasing /etc/security/pam_env.conf into the chroot allows pam_env to
# work at session-end time (http://bugzilla.redhat.com/477120)
VRootEngine         on
DefaultRoot         ~ !adm
VRootAlias          etc/security/pam_env.conf /etc/security/pam_env.conf
 
# Use pam to authenticate (default) and be authoritative
AuthPAMConfig           proftpd
AuthOrder           mod_auth_pam.c* mod_auth_unix.c
# If you use NIS/YP/LDAP you may need to disable PersistentPasswd
#PersistentPasswd       off
 
# Don't do reverse DNS lookups (hangs on DNS problems)
UseReverseDNS           off
 
# Set the user and group that the server runs as
User                nobody
Group               nobody
 
# To prevent DoS attacks, set the maximum number of child processes
# to 20.  If you need to allow more than 20 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            20
 
# Disable sendfile by default since it breaks displaying the download speeds in
# ftptop and ftpwho
UseSendfile         off
 
# Define the log formats
LogFormat           default "%h %l %u %t \"%r\" %s %b"
LogFormat           auth    "%v [%P] %h %t \"%r\" %s"
 
# Dynamic Shared Object (DSO) loading
# See README.DSO and howto/DSO.html for more details
#
# General database support (http://www.proftpd.org/docs/contrib/mod_sql.html)
#   LoadModule mod_sql.c
#
# Support for base-64 or hex encoded MD5 and SHA1 passwords from SQL tables
# (contrib/mod_sql_passwd.html)
#   LoadModule mod_sql_passwd.c
#
# Mysql support (requires proftpd-mysql package)
# (http://www.proftpd.org/docs/contrib/mod_sql.html)
#   LoadModule mod_sql_mysql.c
#
# Postgresql support (requires proftpd-postgresql package)
# (http://www.proftpd.org/docs/contrib/mod_sql.html)
#   LoadModule mod_sql_postgres.c
#
# Quota support (http://www.proftpd.org/docs/contrib/mod_quotatab.html)
#   LoadModule mod_quotatab.c
#
# File-specific "driver" for storing quota table information in files
# (http://www.proftpd.org/docs/contrib/mod_quotatab_file.html)
#   LoadModule mod_quotatab_file.c
#
# SQL database "driver" for storing quota table information in SQL tables
# (http://www.proftpd.org/docs/contrib/mod_quotatab_sql.html)
#   LoadModule mod_quotatab_sql.c
#
# LDAP support (requires proftpd-ldap package)
# (http://www.proftpd.org/docs/directives/linked/config_ref_mod_ldap.html)
#   LoadModule mod_ldap.c
#
# LDAP quota support (requires proftpd-ldap package)
# (http://www.proftpd.org/docs/contrib/mod_quotatab_ldap.html)
#   LoadModule mod_quotatab_ldap.c
#
# Support for authenticating users using the RADIUS protocol
# (http://www.proftpd.org/docs/contrib/mod_radius.html)
#   LoadModule mod_radius.c
#
# Retrieve quota limit table information from a RADIUS server
# (http://www.proftpd.org/docs/contrib/mod_quotatab_radius.html)
#   LoadModule mod_quotatab_radius.c
#
# Administrative control actions for the ftpdctl program
# (http://www.proftpd.org/docs/contrib/mod_ctrls_admin.html)
#   LoadModule mod_ctrls_admin.c
#
# Execute external programs or scripts at various points in the process
# of handling FTP commands
# (http://www.castaglia.org/proftpd/modules/mod_exec.html)
#   LoadModule mod_exec.c
#
# Support for POSIX ACLs
# (http://www.proftpd.org/docs/modules/mod_facl.html)
#   LoadModule mod_facl.c
#
# Support for using the GeoIP library to look up geographical information on
# the connecting client and usng that to set access controls for the server
# (http://www.castaglia.org/proftpd/modules/mod_geoip.html)
#   LoadModule mod_geoip.c
#
# Configure server availability based on system load
# (http://www.proftpd.org/docs/contrib/mod_load.html)
#   LoadModule mod_load.c
#
# Limit downloads to a multiple of upload volume (see README.ratio)
#   LoadModule mod_ratio.c
#
# Rewrite FTP commands sent by clients on-the-fly,
# using regular expression matching and substitution 
# (http://www.proftpd.org/docs/contrib/mod_rewrite.html)
#   LoadModule mod_rewrite.c
#
# Support for the SSH2, SFTP, and SCP protocols, for secure file transfer over
# an SSH2 connection (http://www.castaglia.org/proftpd/modules/mod_sftp.html)
#   LoadModule mod_sftp.c
#
# Use PAM to provide a 'keyboard-interactive' SSH2 authentication method for
# mod_sftp (http://www.castaglia.org/proftpd/modules/mod_sftp_pam.html)
#   LoadModule mod_sftp_pam.c
#
# Use SQL (via mod_sql) for looking up authorized SSH2 public keys for user
# and host based authentication
# (http://www.castaglia.org/proftpd/modules/mod_sftp_sql.html)
#   LoadModule mod_sftp_sql.c
#
# Provide data transfer rate "shaping" across the entire server
# (http://www.castaglia.org/proftpd/modules/mod_shaper.html)
#   LoadModule mod_shaper.c
#
# Support for miscellaneous SITE commands such as SITE MKDIR, SITE SYMLINK,
# and SITE UTIME (http://www.proftpd.org/docs/contrib/mod_site_misc.html)
#   LoadModule mod_site_misc.c
#
# Provide an external SSL session cache using shared memory
# (contrib/mod_tls_shmcache.html)
#   LoadModule mod_tls_shmcache.c
#
# Use the /etc/hosts.allow and /etc/hosts.deny files, or other allow/deny
# files, for IP-based access control
# (http://www.proftpd.org/docs/contrib/mod_wrap.html)
#   LoadModule mod_wrap.c
#
# Use the /etc/hosts.allow and /etc/hosts.deny files, or other allow/deny
# files, as well as SQL-based access rules, for IP-based access control
# (http://www.proftpd.org/docs/contrib/mod_wrap2.html)
#   LoadModule mod_wrap2.c
#
# Support module for mod_wrap2 that handles access rules stored in specially
# formatted files on disk
# (http://www.proftpd.org/docs/contrib/mod_wrap2_file.html)
#   LoadModule mod_wrap2_file.c
#
# Support module for mod_wrap2 that handles access rules stored in SQL
# database tables (http://www.proftpd.org/docs/contrib/mod_wrap2_sql.html)
#   LoadModule mod_wrap2_sql.c
#
# Provide a flexible way of specifying that certain configuration directives
# only apply to certain sessions, based on credentials such as connection
# class, user, or group membership
# (http://www.proftpd.org/docs/contrib/mod_ifsession.html)
#   LoadModule mod_ifsession.c
 
# TLS (http://www.castaglia.org/proftpd/modules/mod_tls.html)
<IfDefine TLS>
  TLSEngine         on
  TLSRequired           on
  TLSRSACertificateFile     /etc/pki/tls/certs/proftpd.pem
  TLSRSACertificateKeyFile  /etc/pki/tls/certs/proftpd.pem
  TLSCipherSuite        ALL:!ADH:!DES
  TLSOptions            NoCertRequest
  TLSVerifyClient       off
  #TLSRenegotiate       ctrl 3600 data 512000 required off timeout 300
  TLSLog            /var/log/proftpd/tls.log
  <IfModule mod_tls_shmcache.c>
    TLSSessionCache     shm:/file=/var/run/proftpd/sesscache
  </IfModule>
</IfDefine>
 
# Dynamic ban lists (http://www.proftpd.org/docs/contrib/mod_ban.html)
# Enable this with PROFTPD_OPTIONS=-DDYNAMIC_BAN_LISTS in /etc/sysconfig/proftpd
<IfDefine DYNAMIC_BAN_LISTS>
  LoadModule            mod_ban.c
  BanEngine         on
  BanLog            /var/log/proftpd/ban.log
  BanTable          /var/run/proftpd/ban.tab
 
  # If the same client reaches the MaxLoginAttempts limit 2 times
  # within 10 minutes, automatically add a ban for that client that
  # will expire after one hour.
  BanOnEvent            MaxLoginAttempts 2/00:10:00 01:00:00
 
  # Allow the FTP admin to manually add/remove bans
  BanControlsACLs       all allow user ftpadm
</IfDefine>
 
# Global Config - config common to Server Config and all virtual hosts
# See: http://www.proftpd.org/docs/howto/Vhost.html
<Global>
 
  # Umask 022 is a good standard umask to prevent new dirs and files
  # from being group and world writable
  Umask             022
 
  # Allow users to overwrite files and change permissions
  AllowOverwrite        yes
  <Limit ALL SITE_CHMOD>
    AllowAll
  </Limit>
 
</Global>
 
# A basic anonymous configuration, with an upload directory
# Enable this with PROFTPD_OPTIONS=-DANONYMOUS_FTP in /etc/sysconfig/proftpd
<IfDefine ANONYMOUS_FTP>
  <Anonymous ~ftp>
    User            ftp
    Group           ftp
    AccessGrantMsg      "Anonymous login ok, restrictions apply."
 
    # We want clients to be able to login with "anonymous" as well as "ftp"
    UserAlias           anonymous ftp
 
    # Limit the maximum number of anonymous logins
    MaxClients          10 "Sorry, max %m users -- try again later"
 
    # Put the user into /pub right after login
    #DefaultChdir       /pub
 
    # We want 'welcome.msg' displayed at login, '.message' displayed in
    # each newly chdired directory and tell users to read README* files. 
    DisplayLogin        /welcome.msg
    DisplayChdir        .message
    DisplayReadme       README*
 
    # Cosmetic option to make all files appear to be owned by user "ftp"
    DirFakeUser         on ftp
    DirFakeGroup        on ftp
 
    # Limit WRITE everywhere in the anonymous chroot
    <Limit WRITE SITE_CHMOD>
      DenyAll
    </Limit>
 
    # An upload directory that allows storing files but not retrieving
    # or creating directories.
    <Directory uploads/*>
      AllowOverwrite        no
      <Limit READ>
        DenyAll
      </Limit>
 
      <Limit STOR>
        AllowAll
      </Limit>
    </Directory>
 
    # Don't write anonymous accesses to the system wtmp file (good idea!)
    WtmpLog         off
 
    # Logging for the anonymous transfers
    ExtendedLog         /var/log/proftpd/access.log WRITE,READ default
    ExtendedLog         /var/log/proftpd/auth.log AUTH auth
 
  </Anonymous>
</IfDefine>

#4 Thu, 04/12/2012 - 08:34

andreychek

Well, different distributions have different defaults that they add to their config files.

You could just add a TimeoutIdle line near the top of your config file, and set it to your desired value.

Details on that parameter are here:

http://www.proftpd.org/docs/directives/linked/config_ref_TimeoutIdle.html

After you add it, you'd need to restart Proftpd.

-Eric

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