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Current File : //sbin/augenrules
#!/bin/bash # Script to concatenate rules files found in a base audit rules directory # to form a single /etc/audit/audit.rules file suitable for loading into # the Linux audit system # When forming the interim rules file, both empty lines and comment # lines (starting with # or <whitespace>#) are stripped as the source files # are processed. # # Having formed the interim rules file, the script checks if the file is empty # or is identical to the existing /etc/audit/audit.rules and if either of # these cases are true, it does not replace the existing file # # Variables # # DestinationFile: # Destination rules file # SourceRulesDir: # Directory location to find component rule files # TmpRules: # Temporary interim rules file # ASuffix: # Suffix for previous audit.rules file if this script replaces it. # The file is left in the destination directory with suffix with $ASuffix DestinationFile=/etc/audit/audit.rules SourceRulesDir=/etc/audit/rules.d TmpRules=`mktemp /tmp/aurules.XXXXXXXX` ASuffix="prev" OnlyCheck=0 LoadRules=0 RETVAL=0 usage="Usage: $0 [--check|--load]" # Delete the interim file on faults trap 'rm -f ${TmpRules}; exit 1' 1 2 3 13 15 try_load() { if [ $LoadRules -eq 1 ] ; then /sbin/auditctl -R ${DestinationFile} RETVAL=$? fi } while [ $# -ge 1 ] do if [ "$1" = "--check" ] ; then OnlyCheck=1 elif [ "$1" = "--load" ] ; then LoadRules=1 else echo "$usage" exit 1 fi shift done # Check environment if [ ! -d ${SourceRulesDir} ]; then echo "$0: No rules directory - ${SourceRulesDir}" rm -f ${TmpRules} try_load exit 1 fi # Create the interim rules file ensuring its access modes protect it # from normal users and strip empty lines and comment lines. We also ensure # - the last processed -D directive without an option is emitted as the first # line. -D directives with options are left in place # - the last processed -b directory is emitted as the second line # - the last processed -f directory is emitted as the third line # - the last processed -e directive is emitted as the last line umask 0137 echo "## This file is automatically generated from $SourceRulesDir" >> ${TmpRules} for rules in $(/bin/ls -1v ${SourceRulesDir} | grep "\.rules$") ; do cat ${SourceRulesDir}/${rules} done | awk ' BEGIN { minus_e = ""; minus_D = ""; minus_f = ""; minus_b = ""; rest = 0; } { if (length($0) < 1) { next; } if (match($0, "^\\s*#")) { next; } if (match($0, "^\\s*-e")) { minus_e = $0; next; } if (match($0, "^\\s*-D\\s*$")) { minus_D = $0; next; } if (match($0, "^\\s*-f")) { minus_f = $0; next; } if (match($0, "^\\s*-b")) { minus_b = $0; next; } rules[rest++] = $0; } END { printf "%s\n%s\n%s\n", minus_D, minus_b, minus_f; for (i = 0; i < rest; i++) { printf "%s\n", rules[i]; } printf "%s\n", minus_e; }' >> ${TmpRules} # If empty then quit if [ ! -s ${TmpRules} ]; then echo "$0: No rules" rm -f ${TmpRules} try_load exit $RETVAL fi # If the same then quit cmp -s ${TmpRules} ${DestinationFile} > /dev/null 2>&1 if [ $? -eq 0 ]; then echo "$0: No change" rm -f ${TmpRules} try_load exit $RETVAL elif [ $OnlyCheck -eq 1 ] ; then echo "$0: Rules have changed and should be updated" rm -f ${TmpRules} exit 0 fi # Otherwise we install the new file if [ -f ${DestinationFile} ]; then cp ${DestinationFile} ${DestinationFile}.${ASuffix} fi # We copy the file so that it gets the right selinux lable cp ${TmpRules} ${DestinationFile} chmod 0640 ${DestinationFile} # Restore context on MLS system. /tmp is SystemLow & audit.rules is SystemHigh if [ -x /usr/sbin/restorecon ] ; then /usr/sbin/restorecon -F ${DestinationFile} fi rm -f ${TmpRules} try_load exit $RETVAL
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