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#!/bin/bash
#
# Copyright (C) 2004-2006 Debian Logcheck Team
# <logcheck-devel@alioth.lists.debian.org>
# Copyright (C) 2002,2003 Jonathan Middleton <jjm@ixtab.org.uk>
# Copyright (C) 1999-2002 Rene Mayrhofer <rmayr@debian.org>
# Copyright (C) 1996-1997 Craig Rowland <crowland@psionic.com>
# This file is part of Logcheck
# Logcheck is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
# Logcheck is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with Logcheck; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
# $Id: logcheck,v 1.142 2006/07/06 10:16:42 ttroxell Exp $
if [ $UID == 0 ]; then
echo "logcheck should not be run as root. Use su to invoke logcheck:"
echo "su -s /bin/bash -c \"/usr/sbin/logcheck${@:+ $@}\" logcheck"
echo "Or use sudo: sudo -u logcheck logcheck${@:+ $@}."
# you may want to uncomment that hack to let logcheck invoke itself.
# su -s /bin/bash -c "$0 $*" logcheck
exit 1
fi
if [ ! -f /usr/bin/lockfile-create -o \
! -f /usr/bin/lockfile-remove -o \
! -f /usr/bin/lockfile-touch ]; then
echo "fatal: lockfile-progs is a prerequisite for logcheck, and was not found."
exit 1
fi
# Set the umask
umask 077
# Set the flag variables
SYSTEM=0
SECURITY=0
ATTACK=0
# Set the getopts string
GETOPTS="c:dhH:l:L:m:opr:RsS:tTuvw"
# Get the details for the email message
DATE="$(date +'%Y-%m-%d %H:%M')"
VERSION="1.2.45"
# Set the default report level
REPORTLEVEL="server"
# default to sent mails to local root
SENDMAILTO="root"
# Set the default subject lines
ATTACKSUBJECT="Security Alerts"
SECURITYSUBJECT="Security Events"
EVENTSSUBJECT="System Events"
ADDTAG="no"
# Set the default paths
RULEDIR="/etc/logcheck"
CONFFILE="/etc/logcheck/logcheck.conf"
STATEDIR="/var/lib/logcheck"
LOGFILES_LIST="/etc/logcheck/logcheck.logfiles"
LOGFILE_FALLBACK="/var/log/syslog"
LOGTAIL="/usr/sbin/logtail"
CAT="/bin/cat"
SYSLOG_SUMMARY="/usr/bin/syslog-summary"
# Set the options defaults
INTRO=1
LOGCHECKDEBUG=0
MAILOUT=0
NOCLEANUP=0
REBOOT=0
FQDN=0
SORTUNIQ=0
SUPPORT_CRACKING_IGNORE=0
SYSLOGSUMMARY=0
LOCKDIR=/var/lock/logcheck
LOCKFILE="$LOCKDIR/logcheck"
# Carry out the clean up tasks
cleanup() {
if [ -n "$LOCK" ]; then
debug "cleanup: Killing lockfile-touch - $LOCK"
kill $LOCK && unset LOCK
fi
if [ -f "$LOCKFILE.lock" ]; then
debug "cleanup: Removing lockfile: $LOCKFILE.lock"
lockfile-remove $LOCKFILE
fi
if [ -d $TMPDIR ]; then
# Remove the tmp directory
if [ $NOCLEANUP -eq 0 ];then
cd /var/lib/logcheck
debug "cleanup: Removing - $TMPDIR"
rm -r $TMPDIR
else
debug "cleanup: Not removing - $TMPDIR"
fi
fi
}
# Log debug output to standard error
debug() {
if [ $LOGCHECKDEBUG -eq 1 ]; then
echo "D: [$(date +%s)] $1" >&2
fi
}
# Add warning
warn () {
message=$1
debug "Warning - $message"
if [ -d $TMPDIR ]; then
echo "$message" >> $TMPDIR/warnings \
|| error "Could not append to $TMPDIR/warnings."
fi
echo
return 0
}
# Mail error message to sysadmin
error() {
message=$1
if [ "$2" = "noclean" ]; then
debug "error: Not removing lockfile"
else
if [ -n "$LOCK" ]; then
debug "error: Killing lockfile-touch - $LOCK"
kill $LOCK && unset LOCK
fi
if [ -f "$LOCKFILE.lock" ]; then
debug "error: Removing lockfile: $LOCKFILE.lock"
lockfile-remove $LOCKFILE
fi
fi
debug "Error: $message"
if [ $MAILOUT -eq 0 ]; then
{
cat<<EOF
Warning: If you are seeing this message, your log files may not have been
checked!
Details:
$message
${TMPDIR:+Check temporary directory: $TMPDIR
}
Also verify that the logcheck user can read all files referenced in
/etc/logcheck/logcheck.logfiles!
$(export)
EOF
} | mail -s "Logcheck: $HOSTNAME $DATE exiting due to errors" \
"$SENDMAILTO"
elif [ $MAILOUT -eq 1 ]; then
{
echo "Error: $message."
}
fi
exit 1
}
# Add an identification line at the beginning of the sent mail
setintro() {
if [ -f /etc/logcheck/header.txt -a -r /etc/logcheck/header.txt ] ; then
$CAT /etc/logcheck/header.txt >> $TMPDIR/report \
|| error "Could not append header to $TMPDIR/report."
fi
}
# Add a footer to the report.
setfooter() {
if [ -f /etc/logcheck/footer.txt -a -r /etc/logcheck/footer.txt ] ; then
$CAT /etc/logcheck/footer.txt >> $TMPDIR/report \
|| error "Could not append footer to $TMPDIR/report."
fi
}
# Clean a directory (or single file) to a cleaned tmp version
# takes two args: directory and cleaned file
cleanrules() {
dir=$1
cleaned=$2
if [ -d $dir ]; then
if [ ! -d $cleaned ]; then
mkdir $cleaned \
|| error "Could not make dir $cleaned for cleaned rulefiles."
fi
for rulefile in $(run-parts --list $dir); do
rulefile=$(basename $rulefile)
if [ -f ${dir}/${rulefile} ]; then
debug "cleanrules: ${dir}/${rulefile}"
if [ -r ${dir}/${rulefile} ]; then
# pipe to cat on greps to get usable exit status
egrep --text -v '^[[:space:]]*$|^#' $dir/$rulefile | cat \
>> $cleaned/$rulefile \
|| error "Couldn't append to $cleaned/$rulefile."
else
error "Couldn't read $dir/$rulefile"
fi
fi
done
elif [ -f $dir ]; then
error "cleanrules: '$dir' is a file, not a directory"
elif [ -z $dir ]; then
error "cleanrules: called without argument"
fi
}
# Add any events to the report
report() {
if [ -s $TMPDIR/checked ]; then
printheader "$*" >> $TMPDIR/report \
|| error "Could not append to report."
if [ $SYSLOGSUMMARY -eq 1 ] && [ -x $SYSLOG_SUMMARY ]; then
debug "report: running syslog-summary - $*"
$SYSLOG_SUMMARY $TMPDIR/checked | \
egrep -v "^Summarizing " | cat >> $TMPDIR/report \
|| error "Could not append to report."
else
if [ $SYSLOGSUMMARY -eq 1 ] && [ ! -x $SYSLOG_SUMMARY ]; then
debug "report : WARNING : can't exec $SYSLOG_SUMMARY. Running without summary"
fi
debug "report: cat'ing - $*"
cat $TMPDIR/checked >> $TMPDIR/report \
|| error "Could not append to report."
fi
echo >> $TMPDIR/report \
|| error "Could not append to report."
return 0
else
return 1
fi
}
# Add eventual section titles to the report
printheader() {
char="="
header="$1"
number="$(echo $header | wc -c)"
num=1
line=""
while [ "$num" -lt "$number" ]; do
line="${line}${char}"
if [ "$char" = "=" ]; then
char="-"
else
char="="
fi
num=$(($num + 1))
done
echo "$header"
echo "$line"
}
# Mail the report
sendreport() {
if [ $REBOOT -eq 1 ]; then
subject="Reboot: $HOSTNAME $DATE $*"
else
subject="$HOSTNAME $DATE $*"
fi
if [ $ADDTAG = "yes" ]; then
subject="[logcheck] $subject"
fi
if [ $MAILOUT -eq 1 ]; then
debug "Sending report to STDOUT"
cat $TMPDIR/report
debug "Sent report to STDOUT"
else
debug "Sending report: '$subject' to $SENDMAILTO"
cat $TMPDIR/report | mail -s "$subject" "$SENDMAILTO"
fi
}
# Clean the report to level for type
greplogoutput() {
raise="$1"
sectionstring="$2"
ignore="$3"
ignorehigher="$4"
RETURN=1
for grepfile in $(ls -1 $raise); do
debug "greplogoutput: $grepfile"
# Raise entries that match
egrep --text -f $raise/$grepfile $TMPDIR/logoutput-sorted | cat \
> $TMPDIR/checked \
|| error "Could not output to $TMPDIR/checked."
# apply different ignore rules
if [ -s $TMPDIR/checked ]; then
debug "greplogoutput: Entries in checked"
if [ -n "$ignore" -a -f "$ignore/$(basename $grepfile)" ]; then
cleanchecked "$ignore/$(basename $grepfile)"
fi
# quick and dirty fix for ignoring logcheck-foo files
# in the case logcheck itself has no raised entry
if [ -n "$ignore" -a -f "$ignore/logcheck-$(basename $grepfile)" ]; then
cleanchecked "$ignore/logcheck-$(basename $grepfile)"
fi
# If it's the logcheck file, we do something special
if [ "$(basename $grepfile)" = "logcheck" ]; then
# Now ignore all entries from the ignore dir
# old logcheck versions only ignored logcheck-<package> files
if [ -n "$ignore" ]; then
debug "Applying Logcheck override files"
for file in $(ls -1 $ignore/) ; do
debug "clean logcheck-<package>: $file"
cleanchecked "$ignore/$file"
done
else
debug "No Logcheck override files"
fi
debug "Cleaning logcheck"
# Remove any entries already reported
for file in $(ls $raise/ | grep -v '^logcheck') ; do
debug "Cleaning logcheck: $file"
cleanchecked "$raise/$file"
done
fi
if [ -n "$ignorehigher" ]; then
if [ -d $ignorehigher -a -s $TMPDIR/checked ]; then
cleanchecked "$ignorehigher"
fi
fi
# Apply local rules before we report
if [ -n "$ignore" ]; then
if [ -f $ignore/local -a -s $TMPDIR/checked ]; then
cleanchecked "$ignore/local"
fi
# Now apply any local-* files
for file in $(ls -1 $ignore/ | grep '^local-') ; do
cleanchecked "$ignore/$file"
done
fi
if [ "$(basename $grepfile)" = "logcheck" ]; then
report "${sectionstring}" && RETURN=0
else
report "${sectionstring} for $(basename $grepfile)" \
&& RETURN=0
fi
fi
done
debug "greplogoutput: returning $RETURN"
return $RETURN
}
# Process a logfile snippet with egrep.
cleanchecked() {
clean=$1
if [ -f $clean ]; then
debug "cleanchecked - file: $clean"
egrep --text -v -f $clean $TMPDIR/checked | cat >> $TMPDIR/checked.1 \
|| error "Could not output to $TMPDIR/checked.1."
mv $TMPDIR/checked.1 $TMPDIR/checked \
|| error "Could not move $TMPDIR/checked.1 to $TMPDIR/checked"
elif [ -d $clean ]; then
debug "cleanchecked - dir - $clean"
for file in $(ls -1 $clean/); do
debug "cleanchecked - dir - $clean/$file"
egrep --text -v -f "$clean/$file" $TMPDIR/checked | cat \
>> $TMPDIR/checked.1 \
|| error "Could not output to TMPDIR/checked.1."
mv $TMPDIR/checked.1 $TMPDIR/checked \
|| error "Could not move $TMPDIR/checked.1 to $TMPDIR/checked"
done
else
error "cleanchecked: Not a file or a directory $clean"
fi
}
# Get the yet unseen part of one logfile.
logoutput() {
file=$1
# There are some problems with this section.
debug "logoutput called with file: $file"
if [ -f "$file" ]; then
offsetfile="$STATEDIR/offset$(echo $file | tr / .)"
if [ -s "$offsetfile" -a -r "$offsetfile" ]; then
if [[ $(wc -c < "$file") -lt $(tail -n 1 "$offsetfile") ]]; then
# assume the log is rotated by savelog(8)
# syslog-ng leaves old files here
if [ -e "$file.0" -a "$file.0" -nt "$file.1.gz" ]; then
debug "Running logtail on rotated: $file.0"
$LOGTAIL -f "$file.0" -o "$offsetfile" $LOGTAIL_OPTS > \
$TMPDIR/logoutput/$(basename "$file") 2>&1 \
|| error "Could not run logtail or save output"
rm -f "$offsetfile" \
|| error "Could not remove $offsetfile"
# assume the log is rotated by logrotate(8)
# should also probably check if file is still fresh
elif [ -e "$file.1" ]; then
debug "Running logtail on rotated: $file.1"
$LOGTAIL -f "$file.1" -o "$offsetfile" $LOGTAIL_OPTS > \
$TMPDIR/logoutput/$(basename "$file") 2>&1 \
|| error "Could not run logtail or save output"
rm -f "$offsetfile" \
|| error "Could not remove $offsetfile"
fi
fi
fi
debug "Running logtail: $file"
$LOGTAIL -f "$file" -o "$offsetfile" $LOGTAIL_OPTS \
>> $TMPDIR/logoutput/$(basename "$file") 2>&1 \
|| error "Could not run logtail or save output"
else
echo "E: File could not be read: $file" >> $TMPDIR/errors \
|| error "Could not output to $TMPDIR/errors."
fi
}
# Show all the cli options to our users.
usage() {
debug "usage: Printing usage and exiting"
cat<<EOF
usage: logcheck [-c CFG] [-d] [-h] [-H HOST] [-l LOG] [-L CFG] [-m MAIL] [-o]
[-r DIR] [-s|-p|-w] [-R] [-S DIR] [-t] [-T] [-u]
-c CFG = override default configuration file
-d = debug mode
-h = print this usage information and exit
-H HOST = use this hostname in the subject of any generated mail
-l LOG = check the specified logfile
-L CFG = override default logfiles list
-m MAIL = send the report to the specified recipient
-o = send the report to stdout, no mail will be sent
-p = use the "paranoid" runlevel
-r DIR = override default rules directory
-R = adds "Reboot:" to email subject
-s = use the "server" runlevel
-S DIR = override default state directory
-t = testing mode, don't update the logfile offsets
-T = do not remove the TMPDIR
-u = enable syslog-summary
-v = print version
-w = use the "workstation" runlevel
EOF
}
# Check the commandline options for a change to the config file option
while getopts $GETOPTS opt; do
case "$opt" in
c)
debug "Setting CONFFILE to $OPTARG"
CONFFILE="$OPTARG"
if [ ! -r $CONFFILE ]; then
error "Config file $CONFFILE unreadable or does not exists"
fi
;;
d)
LOGCHECKDEBUG=1
debug "Turning debug mode on"
;;
h)
usage
exit 0
;;
T)
debug "Setting NOCLEANUP to 1"
NOCLEANUP=1
;;
v)
echo "logcheck $VERSION"
exit 0
;;
\?)
usage
exit 1
;;
esac
done
# Now reset $OPTIND to 1
OPTIND=1
debug "Sourcing - $CONFFILE"
# Now source the config file - before things that should not be changed
if [ -r $CONFFILE ]; then
. $CONFFILE
elif [ -f $CONFFILE ]; then
error "Config file $CONFFILE could not be read"
fi
# Setup the compatibility for the old style of setting $INTRO
# And handle it being set to ""
if [ -z "$INTRO" ]; then
INTRO=1
else
if [ "$INTRO" = "no" ]; then
INTRO=0
elif [ "$INTRO" = "yes" ]; then
INTRO=1
fi
fi
# Use sort -u or -k 1,3 -s
if [ $SORTUNIQ -eq 1 ];then
SORT="sort -u"
else
SORT="sort -k 1,3 -s"
fi
# Hostname either fully qualified or not.
if [ $FQDN -eq 1 ]; then
HOSTNAME="$(hostname --fqdn)" > /dev/null 2>&1
else
HOSTNAME="$(hostname --short)" > /dev/null 2>&1
fi
# Now check for the other options
while getopts $GETOPTS opt; do
case "$opt" in
H)
debug "Setting HOSTNAME to $OPTARG"
HOSTNAME="$OPTARG"
;;
l)
debug "Setting LOGFILE to $OPTARG"
LOGFILE="$OPTARG"
;;
L)
debug "Setting LOGFILES_LIST to $OPTARG"
LOGFILES_LIST="$OPTARG"
;;
m)
debug "Setting SENDMAILTO to $OPTARG"
SENDMAILTO="$OPTARG"
;;
o)
debug "Setting MAILOUT to 1"
MAILOUT="1"
;;
p)
debug "Setting REPORTLEVEL to paranoid"
REPORTLEVEL="paranoid"
;;
r)
debug "Setting RULEDIR to $OPTARG"
RULEDIR="$OPTARG"
;;
R)
debug "Setting REBOOT to 1"
REBOOT=1
;;
s)
debug "Setting REPORTLEVEL to server"
REPORTLEVEL="server"
;;
S)
debug "Setting STATEDIR to $OPTARG"
STATEDIR="$OPTARG"
;;
u)
debug "Setting SYSLOGSUMMARY to 1"
SYSLOGSUMMARY="1"
;;
t)
debug "Setting LOGTAIL_OPTS to -t"
LOGTAIL_OPTS=' -t'
;;
w)
debug "Setting REPORTLEVEL to workstation"
REPORTLEVEL="workstation"
;;
\?)
usage
exit 1
;;
esac
done
debug "Finished getopts $GETOPTS"
shift `expr $OPTIND - 1`
if [ $REPORTLEVEL = "workstation" ]; then
REPORTLEVELS="workstation server paranoid"
elif [ $REPORTLEVEL = "server" ]; then
REPORTLEVELS="server paranoid"
elif [ $REPORTLEVEL = "paranoid" ]; then
REPORTLEVELS="paranoid"
else
error "REPORTLEVEL is set to an unknown value" "noclean"
fi
trap 'cleanup' 0
debug "Trying to get lockfile: $LOCKFILE.lock"
if [ ! -d $LOCKDIR ]; then
mkdir -m 0755 $LOCKDIR
fi
lockfile-create --retry 1 $LOCKFILE > /dev/null 2>&1
if [ $? -eq 1 ]; then
trap 0
error "Failed to get lockfile: $LOCKFILE.lock" "noclean"
else
debug "Running lockfile-touch $LOCKFILE.lock"
lockfile-touch $LOCKFILE &
LOCK="$!"
fi
# Create the secure temporary directory or exit
TMPDIR=$(mktemp -d -p /tmp logcheck.XXXXXX) \
|| TMPDIR=$(mktemp -d -p /var/tmp logcheck.XXXXXX) \
|| error "Could not create temporary directory"
# Now clean the rulefiles in the directories
cleanrules "$RULEDIR/cracking.d" $TMPDIR/cracking
cleanrules "$RULEDIR/violations.d" $TMPDIR/violations
cleanrules "$RULEDIR/violations.ignore.d" $TMPDIR/violations-ignore
# Now clean the ignore rulefiles for the report levels
for level in $REPORTLEVELS; do
cleanrules "$RULEDIR/ignore.d.$level" $TMPDIR/ignore
done
# The following cracking.ignore directory will only be used if
# $SUPPORT_CRACKING_IGNORE is set to 1 in the configuration file.
# This is *only* for local admin use.
if [ $SUPPORT_CRACKING_IGNORE -eq 1 ]; then
cleanrules "$RULEDIR/cracking.ignore.d" $TMPDIR/cracking-ignore
fi
# Get the list of log files from config file
# Handle log rotation correctly, idea taken from Wiktor Niesiobedzki.
mkdir $TMPDIR/logoutput \
|| error "Could not mkdir for log files"
if [ ! $LOGFILE ] && [ -r $LOGFILES_LIST ]; then
for file in $(egrep --text -v "(^#|^[[:space:]]*$)" $LOGFILES_LIST); do
logoutput "$file"
done
elif [ $LOGFILE ]; then
if [ -f $LOGFILE ] && [ -r $LOGFILE ]; then
logoutput "$LOGFILE"
else
error "$LOGFILE don't exist or we do not have permissions to read it"
fi
elif [ -r $LOGFILE_FALLBACK ]; then
logoutput "$LOGFILE_FALLBACK"
else
error "Gave up no Logfile exist or we do not have permissions to read it"
fi
# First sort the logs to remove duplicate lines (from different logfiles with
# the same lines) and reduce CPU and memory usage afterwards.
debug "Sorting logs"
$SORT $TMPDIR/logoutput/* | sed -e 's/[[:space:]]\+$//' | cat \
> $TMPDIR/logoutput-sorted \
|| error "Could not output to $TMPDIR/logoutput-sorted."
# See if the tmp file exists and actually has data to check,
# if it doesn't we should erase it and exit as our job is done.
if [ ! -s $TMPDIR/logoutput-sorted -a ! -f $TMPDIR/errors ]; then
debug "Nothing to report"
exit 0
elif [ ! -s $TMPDIR/logoutput-sorted -a -f $TMPDIR/errors ]; then
error "$(cat $TMPDIR/errors)"
fi
if [ $INTRO -eq 1 ]; then
debug "Setting the Intro"
setintro
else
debug "Not setting the Intro"
fi
if [ -f $TMPDIR/errors ]; then
{
cat<<EOF
$(cat $TMPDIR/errors)
EOF
} >> $TMPDIR/report \
|| error "Could not output to $TMPDIR/report."
fi
# Check for blatant cracking attempts
if [ -d $TMPDIR/cracking ]; then
if [ $SUPPORT_CRACKING_IGNORE -eq 1 ]; then
debug "Checking for security alerts and using cracking-ignore"
if [ -d $TMPDIR/cracking-ignore ]; then
greplogoutput $TMPDIR/cracking "$ATTACKSUBJECT" \
$TMPDIR/cracking-ignore && ATTACK="1"
fi
else
debug "Checking for security alerts"
greplogoutput $TMPDIR/cracking "$ATTACKSUBJECT" \
&& ATTACK="1"
fi
fi
# Check for security events
if [ -d $TMPDIR/violations ]; then
debug "Checking for security events"
rm -f $TMPDIR/checked
if [ $ATTACK -eq 1 ]; then
greplogoutput $TMPDIR/violations "$SECURITYSUBJECT" \
$TMPDIR/violations-ignore $TMPDIR/cracking && SECURITY="1"
else
greplogoutput $TMPDIR/violations "$SECURITYSUBJECT" \
$TMPDIR/violations-ignore && SECURITY="1"
fi
fi
# Do reverse grep on patterns we want to ignore
if [ -d $TMPDIR/ignore ]; then
debug "Checking for system events"
cp $TMPDIR/logoutput-sorted $TMPDIR/checked \
|| error "Could not copy $TMPDIR/logoutput-sorted to $TMPDIR/checked"
cleanchecked $TMPDIR/ignore
if [ -s $TMPDIR/checked ]; then
debug "Removing alerts from system events"
cleanchecked $TMPDIR/cracking
fi
if [ -s $TMPDIR/checked ]; then
debug "Removing violations from system events"
cleanchecked $TMPDIR/violations
fi
report "$EVENTSSUBJECT" && SYSTEM="1"
fi
# Add warnings to report
if [ -f $TMPDIR/warnings ]; then
printheader "Logcheck Warnings" >> $TMPDIR/report \
|| error "Cannot append warnings to report."
cat $TMPDIR/warnings >> $TMPDIR/report && echo >> $TMPDIR/report \
|| error "Cannot append warnings to report."
fi
# Include the footer if present.
if [ $INTRO -eq 1 ]; then
debug "Setting the footer text"
setfooter
else
debug "Not setting the footer text"
fi
# If there are results, mail them to sysadmin
if [ $ATTACK -eq 1 ]; then
sendreport "$ATTACKSUBJECT"
elif [ $SECURITY -eq 1 ]; then
sendreport "$SECURITYSUBJECT"
elif [ $SYSTEM -eq 1 ]; then
sendreport "$EVENTSSUBJECT"
fi
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