132 lines
4.7 KiB
Awk
Executable File
132 lines
4.7 KiB
Awk
Executable File
#!/bin/bash
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# Check pawn attempts
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# Warn on blank log
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# Incorrect timestamp - very old TS or latest TS older than older TS
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# out of order or blocks of time are missing
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# Give options to process only a certain number of day's log
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# Check if mawk is available -> if yes, use that
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# Since changing language improves performance
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LC_ALL=C
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# Adding the port-program mapping to a shell variable
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# We shall pass it to awk later
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declare port_programs=$(sudo ss -lpntu |
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awk 'BEGIN {FS=":"}
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NR>1 && $1 !~ "\\[" {print $2, $NF} # Row does NOT contains [ -> Fetch 2nd and last columns
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NR>1 && $1 ~ "\\[" {print $4, $NF} # Row contains [ -> Fetch 4th and last columns
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' |
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awk '{
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port = $1
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program = substr($3,
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index($3, "\"")+1,
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index($3, ",")-index($3,"\"")-2)
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# Add multiple programs listening on a single port as comma separated list
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if (port_programs[port]==""){
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port_programs[port]=program
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}else if (index(port_programs[port], program) > 0){ # Remove duplicates
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next
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}
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else{
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port_programs[port]=port_programs[port]","program
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}
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}
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END {
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for (port in port_programs)
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print port, port_programs[port]
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}')
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cat /var/log/ufw.log |
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mawk '
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function GetValue(currentColumnValue, stringToSearch) {
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if(currentColumnValue~"^"stringToSearch){
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sub(stringToSearch"=", "", currentColumnValue)
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currentColumnValue=(currentColumnValue=="")?"-NA-":currentColumnValue
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return currentColumnValue
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}
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}
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$0~/BLOCK/{
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# loop through each column
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# Capture value of those that contain "IN", "OUT" "SRC", "DST", "SPT", "DPT" & "PROTO" capture
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for (n=1;n<=NF;n++){
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if($n=="[UFW" && $(n+1)~/]$/)
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EVENT=$n "-" $(n+1)
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if($n=="[UFW" && $(n+2)~/]$/)
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EVENT=$n "-" $(n+1) "-" $(n+2)
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if($n~/^IN/) IN = GetValue($n, "IN")
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if($n~/^OUT/) OUT = GetValue($n, "OUT")
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if($n~/^SRC/) SRC = GetValue($n, "SRC")
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if($n~/^DST/) DST = GetValue($n, "DST")
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if($n~/^SPT/) SRCPORT = GetValue($n, "SPT")
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if($n~/^DPT/) DSTPORT = GetValue($n, "DPT")
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if($n~/^PROTO/) PROTO = GetValue($n, "PROTO")
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}
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print EVENT, IN, OUT, SRC, DST, SRCPORT, DSTPORT, PROTO
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}' | uniq -c | sort -n |
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awk -v port_programs_bash="$port_programs" '
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BEGIN{
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# Column headers
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printf ("%6s %15s %10s %10s %15s %15s %8s %8s %8s %20s\n", "Count", "Event-Type", "IN-BOUND?", "OUT-BOUND?", "SRC-Addr", "DST-Addr", "SRC-PORT", "DST-PORT", "Protocol", "Port-Listeners")
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print "-----------------------------------------------------------------------------------------------------------------------------"
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#Deserialize the port_programs_bash
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len=split(port_programs_bash, temp)
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for (i=2;i<=len;i+=2) {
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port_programs[temp[i-1]]=temp[i]
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}
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i=0
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}
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{
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total+=$1
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SRC_IPS[$5]+=$1
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DST_IPS[$6]+=$1
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printf ("%6d %15s %10s %10s %15s %15s %8d %8d %8s %20s\n", $1, $2, $3, $4, $5, $6, $7, $8, $9, port_programs[$7])
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}
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END {
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print ""
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print "Top-5 Most-blocked Destination-IPs"
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print "-----","-----", "-----", "-----", "-----", "-----"
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printf ("%16s\t%5s \n", "IP", "Count")
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PROCINFO["sorted_in"] = "@val_num_desc"
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for (IP in DST_IPS){
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printf ("%16s\t%5d \n", IP, DST_IPS[IP])
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i++; if(i==5) break
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}
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print " "
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print "Top-5 Most-blocked Source-IPs"
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print "-----","-----", "-----", "-----", "-----"
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printf ("%16s\t%5s \n", "IP", "Count")
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for (IP in SRC_IPS){
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printf ("%16s\t%5d \n", IP, SRC_IPS[IP])
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j++; if(j==5) break
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}
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print ""
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print "Total records parsed = "total
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}
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'
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# Check if there are huge gaps in TS
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cat /var/log/ufw.log |
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awk '{
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curr_ts=$1
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# TS out of order
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if(last_ts != "" && curr_ts < last_ts)
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something_wrong_at[i++]=curr_ts
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if (last_ts != "" && curr_ts > (last_ts + huge_gap))
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gaps_at[++j]=curr_ts
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last_ts=curr_ts
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}
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' |