Category: Webservers

File Upload Size Limits

July 28, 2004

In php.ini the following parameters impact file uploads: file_uploads http://www.php.net/manual/en/ini.sect.file_uploads.php#ini.file-uploads upload_tmp_dir http://www.php.net/manual/en/ini.sect.file_uploads.php#ini.upload-tmp-dir upload_max_filesize http://www.php.net/manual/en/ini.sect.file_uploads.php#ini.upload-max-filesize post_max_size http://www.php.net/manual/en/ini.sect.data-handling.php#ini.post-max-size max_input_time http://www.php.net/manual/en/ref.info.php#ini.max-input-time memory_limit http://www.php.net/manual/en/ini.sect.resource-limits.php#ini.memory-limit Apache might also impose a limit on the size of file uploads using the LimitBodyRequest directive. See http://httpd.apache.org/docs-2.1/ko/mod/core.html#limitrequestbody for details.

Squid Guard

July 28, 2004


#!/bin/bash
# squid		This shell script takes care of starting and stopping
#		Squid Internet Object Cache
#
# chkconfig: - 90 25
# description: Squid - Internet Object Cache. Internet object caching is \
# 	a way to store requested Internet objects (i.e., data available \
# 	via the HTTP, FTP, and gopher protocols) on a system closer to the \
#	requesting site than to the source. Web browsers can then use the \
#	local Squid cache as a proxy HTTP server, reducing access time as \
#	well as bandwidth consumption.
# pidfile: /var/run/squid.pid
# config: /etc/squid/squid.conf

PATH=/usr/bin:/sbin:/bin:/usr/sbin
export PATH

# Source function library.
. /etc/rc.d/init.d/functions

# Source networking configuration.
. /etc/sysconfig/network

# Check that networking is up.
[ ${NETWORKING} = "no" ] && exit 0

# check if the squid conf file is present
[ -f /usr/local/squid/etc/squid.conf ] || exit 0

# determine the name of the squid binary
[ -f /usr/local/squid/sbin/squid ] && SQUID=squid
[ -z "$SQUID" ] && exit 0

prog="$SQUID"

# determine which one is the cache_swap directory
CACHE_SWAP=`sed -e 's/#.*//g' /usr/local/squid/etc/squid.conf | \
	grep cache_dir |  awk '{ print $3 }'`
[ -z "$CACHE_SWAP" ] && CACHE_SWAP=/usr/local/squid/var/cache

RETVAL=0

start() {
    for adir in $CACHE_SWAP; do
        if [ ! -d $adir/00 ]; then 
	     echo -n "init_cache_dir $adir... "
	     /usr/local/squid/sbin/squid -z -F 2>/dev/null
	fi
    done
    echo -n $"Starting $SQUID $prog: "
    /usr/local/squid/sbin/squid $SQUID_OPTS 2> /dev/null &
    RETVAL=$?
    [ $RETVAL -eq 0 ] && touch /var/lock/subsys/$SQUID
    [ $RETVAL -eq 0 ] && echo_success
    [ $RETVAL -ne 0 ] && echo_failure
    echo
    return $RETVAL
}

stop() {
    echo -n  $"Stopping $prog: "
    /usr/local/squid/sbin/squid -k check >/dev/null 2>&1
    RETVAL=$?
    if [ $RETVAL -eq 0 ] ; then
        /usr/local/squid/sbin/squid -k shutdown &
    	rm -f /var/lock/subsys/$SQUID
	timeout=0
 	while : ; do
		[ -f /usr/local/squid/var/logs/squid.pid ] || break
		sleep 2 && echo -n "." 
		timeout=$((timeout+2))
    	done
	echo_success
	echo 
    else
    	echo_failure
	echo
    fi
    return $RETVAL
}    

reload() {
    /usr/local/squid/sbin/squid $SQUID_OPTS -k reconfigure 
}

restart() {
    stop
    start
}    

condrestart() {
    [ -e /var/lock/subsys/squid ] && restart || :
}

rhstatus() { 
    status $SQUID
    /usr/local/squid/sbin/squid -k check
}

probe() {
    return 0
}    

case "$1" in
start)
    start
    ;;

stop)
    stop
    ;;

reload)
    reload
    ;;

restart)
    restart
    ;;

condrestart)
    condrestart
    ;;

status)
    rhstatus
    ;;

probe)
    exit 0
    ;;

*)
    echo $"Usage: $0 {start|stop|status|reload|restart|condrestart}"
    exit 1
esac

exit $?

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#!/bin/bash

# squid This shell script takes care of starting and stopping

# Squid Internet Object Cache

# chkconfig: - 90 25

# description: Squid - Internet Object Cache. Internet object caching is \

# a way to store requested Internet objects (i.e., data available \

# via the HTTP, FTP, and gopher protocols) on a system closer to the \

# requesting site than to the source. Web browsers can then use the \

# local Squid cache as a proxy HTTP server, reducing access time as \

# well as bandwidth consumption.

# pidfile: /var/run/squid.pid

# config: /etc/squid/squid.conf

PATH=/usr/bin:/sbin:/bin:/usr/sbin

export PATH

# Source function library.

. /etc/rc.d/init.d/functions

# Source networking configuration.

. /etc/sysconfig/network

# Check that networking is up.

[ ${NETWORKING} = "no" ] && exit 0

# check if the squid conf file is present

[ -f /usr/local/squid/etc/squid.conf ] || exit 0

# determine the name of the squid binary

[ -f /usr/local/squid/sbin/squid ] && SQUID=squid

[ -z "$SQUID" ] && exit 0

prog="$SQUID"

# determine which one is the cache_swap directory

CACHE_SWAP=`sed -e 's/#.*//g' /usr/local/squid/etc/squid.conf | \

grep cache_dir | awk '{ print $3 }'`

[ -z "$CACHE_SWAP" ] && CACHE_SWAP=/usr/local/squid/var/cache

RETVAL=0

start() {

for adir in $CACHE_SWAP; do

if [ ! -d $adir/00 ]; then

echo -n "init_cache_dir $adir... "

/usr/local/squid/sbin/squid -z -F 2>/dev/null

done

echo -n $"Starting $SQUID $prog: "

/usr/local/squid/sbin/squid $SQUID_OPTS 2> /dev/null &

RETVAL=$?

[ $RETVAL -eq 0 ] && touch /var/lock/subsys/$SQUID

[ $RETVAL -eq 0 ] && echo_success

[ $RETVAL -ne 0 ] && echo_failure

echo

return $RETVAL

}

stop() {

echo -n $"Stopping $prog: "

/usr/local/squid/sbin/squid -k check >/dev/null 2>&1

RETVAL=$?

if [ $RETVAL -eq 0 ] ; then

/usr/local/squid/sbin/squid -k shutdown &

rm -f /var/lock/subsys/$SQUID

timeout=0

while : ; do

[ -f /usr/local/squid/var/logs/squid.pid ] || break

sleep 2 && echo -n "."

timeout=$((timeout+2))

done

echo_success

echo

else

echo_failure

echo

return $RETVAL

}

reload() {

/usr/local/squid/sbin/squid $SQUID_OPTS -k reconfigure

}

restart() {

stop

start

}

condrestart() {

[ -e /var/lock/subsys/squid ] && restart || :

}

rhstatus() {

status $SQUID

/usr/local/squid/sbin/squid -k check

}

probe() {

return 0

}

case "$1" in

start)

start

;;

stop)

stop

;;

reload)

reload

;;

restart)

restart

;;

condrestart)

condrestart

;;

status)

rhstatus

;;

probe)

exit 0

;;

echo $"Usage: $0 {start|stop|status|reload|restart|condrestart}"

exit 1

esac

exit $?

Route Table Testing

July 28, 2004

Use this command:


> ip route get <i>{dest ip}</i>

> ip route get {dest ip}

To test from a specific source use:


> ip route get <i>{dest ip}</i> from <i>{src ip}</i>

> ip route get {dest ip} from {src ip}

Squid Guard

July 26, 2004

We’ll start by installing Squid:


> cd /root
> wget http://www.squid-cache.org/Versions/v2/2.5/squid-2.5.STABLE3.tar.gz
> tar -xvzf squid-2.5.STABLE3.tar.gz
> cd squid-2.5.STABLE3
> ./configure
> make
> make install
> cd /root
> rm -rf squid-2.5.STABLE3
> mkdir archive
> mv squid-2.5.STABLE3.tar.gz archive

> cd /root

> wget http://www.squid-cache.org/Versions/v2/2.5/squid-2.5.STABLE3.tar.gz

> tar -xvzf squid-2.5.STABLE3.tar.gz

> cd squid-2.5.STABLE3

> ./configure

> make

> make install

> cd /root

> rm -rf squid-2.5.STABLE3

> mkdir archive

> mv squid-2.5.STABLE3.tar.gz archive

Squid is now installed at /usr/local/squid. Notice that we use the “wget” command to download the software. Then we unpack and build the software. The build sequence is very typical for Linux packages – configure, make, make install. We finish up by saving the distribution to /root/archive and removing the build directory that is no longer needed. Configuration for squid is pretty simple in the basic case. All configuration is stored in a single file located at /usr/local/squid/etc/squid.conf. The squid.conf file can be edited with your favoriate text editor. All though there are hundreds of configuration options only a few are needed in a basic install. We made the following changes: a. Find the line that looks like this (approx line 684):


  #cache_dir ufs /usr/local/squid/var/cache 100 16 256

#cache_dir ufs /usr/local/squid/var/cache 100 16 256

Remove the “#” comment from the begining of the line and set the desired cache size and location:


  cache_dir ufs /usr/local/squid/var/cache 768 16 256

cache_dir ufs /usr/local/squid/var/cache 768 16 256

This defines

Squid + NTLM

July 26, 2004


Setup working directory

> mkdir /root/squid
> cd /root/squid

Download squid and samba

> wget http://www.squid-cache.org/Versions/v2/2.5/squid-2.5.STABLE3.tar.gz
> wget http://us2.samba.org/samba/ftp/samba-latest.tar.gz

Unpack squid and samba

> tar -xvzf squid-2.5.STABLE3.tar.gz
> tar -xvzf samba-latest.tar.gz

Build samba

> cd samba-2.2.8a/source
> ./configure --with-winbind --with-winbind-auth-challenge
> make
> make install

Configure samba

> cd /root/samba-2.2.8.a/examples/simple
> cp smb.conf /usr/local/samba/lib/
> emacs /usr/local/samba/lib/smb.conf

Add the following lines to the [global] section of the smb.conf file:

    encrypt passwords = true
    workgroup = RELIABLEPENGUIN
    password server = ADTEST
    security = domain
    winbind uid = 10000-20000
    winbind gid = 10000-20000
    winbind use default domain = yes

Replace RELIABLEPENGUIN and ADTEST with the name of the domain and pdc to
be used for this install. Press Ctrl-X Ctrl-C to save and exit emacs.

Comment out entirely the [homes] and [printers] sections.

Join the server to the windows domain.

> ./smbpasswd -j RELIABLEPENGUIN -r ADTEST -U Administrator

Start the samba services:

> /usr/local/samba/bin/nmbd
> /usr/local/samba/bin/winbindd

Test and verify proper operation:

> /usr/local/samba/bin/wbinfo -t
Secret is good

If wbinfo returns "Secret is bad" then run the above command to join the domain
again.

> /usr/local/samba/bin/wbinfo -a RELIABLEPENGUIN\\Administrator%testing
plaintext password authentication succeeded
challenge/response password authentication succeeded

If you get and error then there is something wrong with the domain membership.

Now build squid:

> cd /root/squid/squid-2.5.STABLE3
> ./configure --enable-auth="ntlm,basic" \
     --enable-basic-auth-helpers="winbind" \
     --enable-ntlm-auth-helpers="winbind" \
     --sysconfdir=/etc/squid \
     --sbindir=/usr/sbin \
     --bindir=/usr/sbin \
     --libexecdir=/usr/lib/squid \
     --datadir=/usr/share/squid \
     --localstatedir=/var/run \
     --mandir=/usr/share/man
> make
> make install

Test the winbind helper:

> /usr/lib/squid/wb_auth -d
/wb_auth[16936](wb_basic_auth.c:168): basic winbindd auth helper build Jun  3 2003, 12:03:17 starting up...
RELIABLEPENGUIN\Administrator testing
/wb_auth[16936](wb_basic_auth.c:129): Got 'RELIABLEPENGUIN\Administrator testing' from squid (length: 37).
/wb_auth[16936](wb_basic_auth.c:55): winbindd result: 1
/wb_auth[16936](wb_basic_auth.c:58): sending 'OK' to squid
OK

Now configure squid to use the helper.
Edit /etc/squid/squid.conf and add the following lines:

  pid_filename /var/run/squid.pid

  ....

  cache_dir ufs /var/cache/squid 5000 16 256

  ....

  cache_access_log /var/log/squid/access.log

  ....

  cache_log /var/log/squid/cache.log

  ....

  cache_store_log /var/log/squid/store.log

  ....

  auth_param ntlm program /usr/lib/squid/wb_ntlmauth
  auth_param ntlm children 5
  auth_param ntlm max_challenge_reuses 0
  auth_param ntlm max_challenge_lifetime 2 minutes

  auth_param basic program /usr/lib/squid/wb_auth
  auth_param basic children 5
  auth_param basic realm Squid proxy-caching web server
  auth_param basic credentialsttl 2 hours

  ....

  acl localnetwork src 10.0.0.0/255.0.0.0
  acl password proxy_auth REQUIRED

  ....

  http_access allow password
  http_access allow localnetwork

Do squid cache setup:

> cd /var/cache
> mkdir squid
> chgrp squid squid
> chmod g+w squid
> squid -z

Do squid logs setup:

> cd /var/log
> mkdir squid
> chgrp squid squid
> chmod g+w squid

Setup squid and samba to start on boot:

The stock startup file distributed by redhat with squid is sufficient
for starting squid. This file is located at /etc/init.d/squid. If the file
does not exists on the target system then copy from another system or extract
from the redhat squid rpm.

A custom startup script is required for samba since we're not acting as a file
server - just nmbd and winbind. A suitable file is located at /etc/init.d/samba.
Copy this file to the target system.

Now symlink the startup scripts into the rc dirctories:

ln -s ../init.d/squid /etc/rc3.d/S25squid
ln -s ../init.d/samba /etc/rc3.d/S24samba
ln -s ../init.d/squid /etc/rc3.d/K25squid
ln -s ../init.d/samba /etc/rc3.d/K24samba

And that does it.

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Setup working directory

> mkdir /root/squid

> cd /root/squid

Download squid and samba

> wget http://www.squid-cache.org/Versions/v2/2.5/squid-2.5.STABLE3.tar.gz

> wget http://us2.samba.org/samba/ftp/samba-latest.tar.gz

Unpack squid and samba

> tar -xvzf squid-2.5.STABLE3.tar.gz

> tar -xvzf samba-latest.tar.gz

Build samba

> cd samba-2.2.8a/source

> ./configure --with-winbind --with-winbind-auth-challenge

> make

> make install

Configure samba

> cd /root/samba-2.2.8.a/examples/simple

> cp smb.conf /usr/local/samba/lib/

> emacs /usr/local/samba/lib/smb.conf

Add the following lines to the [global] section of the smb.conf file:

encrypt passwords = true

workgroup = RELIABLEPENGUIN

password server = ADTEST

security = domain

winbind uid = 10000-20000

winbind gid = 10000-20000

winbind use default domain = yes

Replace RELIABLEPENGUIN and ADTEST with the name of the domain and pdc to

be used for this install. Press Ctrl-X Ctrl-C to save and exit emacs.

Comment out entirely the [homes] and [printers] sections.

Join the server to the windows domain.

> ./smbpasswd -j RELIABLEPENGUIN -r ADTEST -U Administrator

Start the samba services:

> /usr/local/samba/bin/nmbd

> /usr/local/samba/bin/winbindd

Test and verify proper operation:

> /usr/local/samba/bin/wbinfo -t

Secret is good

If wbinfo returns "Secret is bad" then run the above command to join the domain

again.

> /usr/local/samba/bin/wbinfo -a RELIABLEPENGUIN\\Administrator%testing

plaintext password authentication succeeded

challenge/response password authentication succeeded

If you get and error then there is something wrong with the domain membership.

Now build squid:

> cd /root/squid/squid-2.5.STABLE3

> ./configure --enable-auth="ntlm,basic" \

--enable-basic-auth-helpers="winbind" \

--enable-ntlm-auth-helpers="winbind" \

--sysconfdir=/etc/squid \

--sbindir=/usr/sbin \

--bindir=/usr/sbin \

--libexecdir=/usr/lib/squid \

--datadir=/usr/share/squid \

--localstatedir=/var/run \

--mandir=/usr/share/man

> make

> make install

Test the winbind helper:

> /usr/lib/squid/wb_auth -d

/wb_auth[16936](wb_basic_auth.c:168): basic winbindd auth helper build Jun 3 2003, 12:03:17 starting up...

RELIABLEPENGUIN\Administrator testing

/wb_auth[16936](wb_basic_auth.c:129): Got 'RELIABLEPENGUIN\Administrator testing' from squid (length: 37).

/wb_auth[16936](wb_basic_auth.c:55): winbindd result: 1

/wb_auth[16936](wb_basic_auth.c:58): sending 'OK' to squid

Now configure squid to use the helper.

Edit /etc/squid/squid.conf and add the following lines:

pid_filename /var/run/squid.pid

....

cache_dir ufs /var/cache/squid 5000 16 256

....

cache_access_log /var/log/squid/access.log

....

cache_log /var/log/squid/cache.log

....

cache_store_log /var/log/squid/store.log

....

auth_param ntlm program /usr/lib/squid/wb_ntlmauth

auth_param ntlm children 5

auth_param ntlm max_challenge_reuses 0

auth_param ntlm max_challenge_lifetime 2 minutes

auth_param basic program /usr/lib/squid/wb_auth

auth_param basic children 5

auth_param basic realm Squid proxy-caching web server

auth_param basic credentialsttl 2 hours

....

acl localnetwork src 10.0.0.0/255.0.0.0

acl password proxy_auth REQUIRED

....

http_access allow password

http_access allow localnetwork

Do squid cache setup:

> cd /var/cache

> mkdir squid

> chgrp squid squid

> chmod g+w squid

> squid -z

Do squid logs setup:

> cd /var/log

> mkdir squid

> chgrp squid squid

> chmod g+w squid

Setup squid and samba to start on boot:

The stock startup file distributed by redhat with squid is sufficient

for starting squid. This file is located at /etc/init.d/squid. If the file

does not exists on the target system then copy from another system or extract

from the redhat squid rpm.

A custom startup script is required for samba since we're not acting as a file

server - just nmbd and winbind. A suitable file is located at /etc/init.d/samba.

Copy this file to the target system.

Now symlink the startup scripts into the rc dirctories:

ln -s ../init.d/squid /etc/rc3.d/S25squid

ln -s ../init.d/samba /etc/rc3.d/S24samba

ln -s ../init.d/squid /etc/rc3.d/K25squid

ln -s ../init.d/samba /etc/rc3.d/K24samba

And that does it.

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Category: Webservers

File Upload Size Limits

Squid Guard

Route Table Testing

Squid Guard

Squid + NTLM

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