emails for all denied network activity using ufw
0
I have ufw configured to deny all incoming and outgoing traffic except input for SSH:
ufw default deny outgoing
ufw default deny incoming
ufw limit in ssh
Is it possible to get e-mails of denied traffic? Something that says/shows traffic was denied, from who, to who, what port, to port, etc...
I feel the e-mails should be digest or something because if all of a sudden there are hundreds of denies in a short amount of time, it should send one e-mail instead of hundreds.
email firewall ufw
asked Feb 6 at 18:54
IMTheNachoManIMTheNachoMan
257212
add a comment |
0
I have ufw configured to deny all incoming and outgoing traffic except input for SSH:
ufw default deny outgoing
ufw default deny incoming
ufw limit in ssh
Is it possible to get e-mails of denied traffic? Something that says/shows traffic was denied, from who, to who, what port, to port, etc...
I feel the e-mails should be digest or something because if all of a sudden there are hundreds of denies in a short amount of time, it should send one e-mail instead of hundreds.
email firewall ufw
asked Feb 6 at 18:54
IMTheNachoManIMTheNachoMan
257212
I don't quite understand the need to lock down your system like this. It's totally crippled your system. Any emails, digest or otherwise, would be constant, and huge. Please explain.
– heynnema
Feb 6 at 19:01
It's a home server I use to play around with and learn on. I have a lot of ports explicitly opened like HTTP and HTTPS out soaptworks. I want to know everything going in and out of the system that I haven't explicitly allowed.
– IMTheNachoMan
Feb 6 at 19:04
You can just start with a simplegrep -i ufw /var/log/syslogormore /var/log/ufw.logto see what you're getting into. Then, if you're convinced that you REALLY want to see all of this noise, pipe either output into a mail message.
– heynnema
Feb 6 at 19:17
That is what I was thinking of doing but thought maybe UFW has a built in way to do it. I can set a daily cron job to create a report and send me email.
– IMTheNachoMan
Feb 6 at 20:13
add a comment |
0
0
0
I have ufw configured to deny all incoming and outgoing traffic except input for SSH:
ufw default deny outgoing
ufw default deny incoming
ufw limit in ssh
Is it possible to get e-mails of denied traffic? Something that says/shows traffic was denied, from who, to who, what port, to port, etc...
I feel the e-mails should be digest or something because if all of a sudden there are hundreds of denies in a short amount of time, it should send one e-mail instead of hundreds.
email firewall ufw
asked Feb 6 at 18:54
IMTheNachoManIMTheNachoMan
257212
I have ufw configured to deny all incoming and outgoing traffic except input for SSH:
ufw default deny outgoing
ufw default deny incoming
ufw limit in ssh
Is it possible to get e-mails of denied traffic? Something that says/shows traffic was denied, from who, to who, what port, to port, etc...
I feel the e-mails should be digest or something because if all of a sudden there are hundreds of denies in a short amount of time, it should send one e-mail instead of hundreds.
email firewall ufw
email firewall ufw
asked Feb 6 at 18:54
IMTheNachoManIMTheNachoMan
257212
asked Feb 6 at 18:54
IMTheNachoManIMTheNachoMan
257212
asked Feb 6 at 18:54
IMTheNachoManIMTheNachoMan
257212
asked Feb 6 at 18:54
IMTheNachoManIMTheNachoMan
257212
asked Feb 6 at 18:54
IMTheNachoManIMTheNachoMan
257212
257212
I don't quite understand the need to lock down your system like this. It's totally crippled your system. Any emails, digest or otherwise, would be constant, and huge. Please explain.
– heynnema
Feb 6 at 19:01
It's a home server I use to play around with and learn on. I have a lot of ports explicitly opened like HTTP and HTTPS out soaptworks. I want to know everything going in and out of the system that I haven't explicitly allowed.
– IMTheNachoMan
Feb 6 at 19:04
You can just start with a simplegrep -i ufw /var/log/syslogormore /var/log/ufw.logto see what you're getting into. Then, if you're convinced that you REALLY want to see all of this noise, pipe either output into a mail message.
– heynnema
Feb 6 at 19:17
That is what I was thinking of doing but thought maybe UFW has a built in way to do it. I can set a daily cron job to create a report and send me email.
– IMTheNachoMan
Feb 6 at 20:13
add a comment |
I don't quite understand the need to lock down your system like this. It's totally crippled your system. Any emails, digest or otherwise, would be constant, and huge. Please explain.
– heynnema
Feb 6 at 19:01
It's a home server I use to play around with and learn on. I have a lot of ports explicitly opened like HTTP and HTTPS out soaptworks. I want to know everything going in and out of the system that I haven't explicitly allowed.
– IMTheNachoMan
Feb 6 at 19:04
You can just start with a simplegrep -i ufw /var/log/syslogormore /var/log/ufw.logto see what you're getting into. Then, if you're convinced that you REALLY want to see all of this noise, pipe either output into a mail message.
– heynnema
Feb 6 at 19:17
That is what I was thinking of doing but thought maybe UFW has a built in way to do it. I can set a daily cron job to create a report and send me email.
– IMTheNachoMan
Feb 6 at 20:13
I don't quite understand the need to lock down your system like this. It's totally crippled your system. Any emails, digest or otherwise, would be constant, and huge. Please explain.
– heynnema
Feb 6 at 19:01
I don't quite understand the need to lock down your system like this. It's totally crippled your system. Any emails, digest or otherwise, would be constant, and huge. Please explain.
– heynnema
Feb 6 at 19:01
It's a home server I use to play around with and learn on. I have a lot of ports explicitly opened like HTTP and HTTPS out so
apt works. I want to know everything going in and out of the system that I haven't explicitly allowed.– IMTheNachoMan
Feb 6 at 19:04
It's a home server I use to play around with and learn on. I have a lot of ports explicitly opened like HTTP and HTTPS out so
apt works. I want to know everything going in and out of the system that I haven't explicitly allowed.– IMTheNachoMan
Feb 6 at 19:04
You can just start with a simple
grep -i ufw /var/log/syslog or more /var/log/ufw.log to see what you're getting into. Then, if you're convinced that you REALLY want to see all of this noise, pipe either output into a mail message.– heynnema
Feb 6 at 19:17
You can just start with a simple
grep -i ufw /var/log/syslog or more /var/log/ufw.log to see what you're getting into. Then, if you're convinced that you REALLY want to see all of this noise, pipe either output into a mail message.– heynnema
Feb 6 at 19:17
That is what I was thinking of doing but thought maybe UFW has a built in way to do it. I can set a daily cron job to create a report and send me email.
– IMTheNachoMan
Feb 6 at 20:13
That is what I was thinking of doing but thought maybe UFW has a built in way to do it. I can set a daily cron job to create a report and send me email.
– IMTheNachoMan
Feb 6 at 20:13
add a comment |
1 Answer
1
active
oldest
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0
I could not find an answer I liked so per @heynnema's advice, I am capturing what I want from /var/log/ufw.log and formatting into a table for e-mail.
echo '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">';
echo '<html>';
echo '<head>';
echo '<title></title>';
echo '<style>table, th, td { border: 1px solid black; border-collapse: collapse; padding: 2px;}</style>';
echo '</head>';
echo '<body>';
echo '<table>';
echo '<tr><th>count</th><th>in or out</th><th>source IP</th><th>destination IP</th><th>source port</th><th>destination port</th></tr>';
# get all lines from yesterday
# capture the relevant data: IN, OUT, SRC, DST, SPT, and DPT
# send to awk
# get hostname for SRC and DST
# print everything as a table
sed -r "s/^$(date --date=yesterday +"%b %_d").*?[UFW BLOCK].*?IN=([^ ]*) OUT=([^ ]*) .*?SRC=([^ ]*) DST=([^ ]*) .*?SPT=([^ ]*) DPT=([^ ]*).*$/,1,2,3,4,5,6/;t;d" /var/log/ufw.log | sort | uniq -c | sort -nr | awk -F"," '{
inOrOut=$2==""?($3==""?"unknown":"out"):"in"
cmd=sprintf("nslookup %s 2>/dev/null | sed -r -e "s/^.*name = (.*).$/\1/;t;d"", $4)
cmd | getline sourceName
close(cmd)
cmd=sprintf("nslookup %s 2>/dev/null | sed -r -e "s/^.*name = (.*).$/\1/;t;d"", $5)
cmd | getline destinationName
close(cmd)
printf "<tr><td>%s</td><td>%s</td><td>%s (%s)</td><td>%s (%s)</td><td>%s</td><td>%s</td></tr>n", $1, inOrOut, $4, sourceName, $5, destinationName, $6, $7
}';
echo '</table>';
echo '<br>';
echo '<br>';
echo '</body>';
echo '</html>';
I have a daily cron job that runs this script and sends as HTML email.
This results in a table like so:
| count | in or out | source IP | destination IP | source port | destination port |
|-------|-----------|-----------------------|-----------------------|-------------|------------------|
| 3 | out | 192.168.1.100 (host1) | 192.168.1.101 (host2) | 100 | 400 |
| 1 | in | 192.168.1.101 (host2) | 192.168.1.100 (host1) | 200 | 500 |
| 1 | out | 192.168.1.100 (host1) | 192.168.1.100 (host1) | 300 | 600 |
answered Feb 8 at 14:00
IMTheNachoManIMTheNachoMan
257212
add a comment |
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0
I could not find an answer I liked so per @heynnema's advice, I am capturing what I want from /var/log/ufw.log and formatting into a table for e-mail.
echo '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">';
echo '<html>';
echo '<head>';
echo '<title></title>';
echo '<style>table, th, td { border: 1px solid black; border-collapse: collapse; padding: 2px;}</style>';
echo '</head>';
echo '<body>';
echo '<table>';
echo '<tr><th>count</th><th>in or out</th><th>source IP</th><th>destination IP</th><th>source port</th><th>destination port</th></tr>';
# get all lines from yesterday
# capture the relevant data: IN, OUT, SRC, DST, SPT, and DPT
# send to awk
# get hostname for SRC and DST
# print everything as a table
sed -r "s/^$(date --date=yesterday +"%b %_d").*?[UFW BLOCK].*?IN=([^ ]*) OUT=([^ ]*) .*?SRC=([^ ]*) DST=([^ ]*) .*?SPT=([^ ]*) DPT=([^ ]*).*$/,1,2,3,4,5,6/;t;d" /var/log/ufw.log | sort | uniq -c | sort -nr | awk -F"," '{
inOrOut=$2==""?($3==""?"unknown":"out"):"in"
cmd=sprintf("nslookup %s 2>/dev/null | sed -r -e "s/^.*name = (.*).$/\1/;t;d"", $4)
cmd | getline sourceName
close(cmd)
cmd=sprintf("nslookup %s 2>/dev/null | sed -r -e "s/^.*name = (.*).$/\1/;t;d"", $5)
cmd | getline destinationName
close(cmd)
printf "<tr><td>%s</td><td>%s</td><td>%s (%s)</td><td>%s (%s)</td><td>%s</td><td>%s</td></tr>n", $1, inOrOut, $4, sourceName, $5, destinationName, $6, $7
}';
echo '</table>';
echo '<br>';
echo '<br>';
echo '</body>';
echo '</html>';
I have a daily cron job that runs this script and sends as HTML email.
This results in a table like so:
| count | in or out | source IP | destination IP | source port | destination port |
|-------|-----------|-----------------------|-----------------------|-------------|------------------|
| 3 | out | 192.168.1.100 (host1) | 192.168.1.101 (host2) | 100 | 400 |
| 1 | in | 192.168.1.101 (host2) | 192.168.1.100 (host1) | 200 | 500 |
| 1 | out | 192.168.1.100 (host1) | 192.168.1.100 (host1) | 300 | 600 |
answered Feb 8 at 14:00
IMTheNachoManIMTheNachoMan
257212
add a comment |
0
I could not find an answer I liked so per @heynnema's advice, I am capturing what I want from /var/log/ufw.log and formatting into a table for e-mail.
echo '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">';
echo '<html>';
echo '<head>';
echo '<title></title>';
echo '<style>table, th, td { border: 1px solid black; border-collapse: collapse; padding: 2px;}</style>';
echo '</head>';
echo '<body>';
echo '<table>';
echo '<tr><th>count</th><th>in or out</th><th>source IP</th><th>destination IP</th><th>source port</th><th>destination port</th></tr>';
# get all lines from yesterday
# capture the relevant data: IN, OUT, SRC, DST, SPT, and DPT
# send to awk
# get hostname for SRC and DST
# print everything as a table
sed -r "s/^$(date --date=yesterday +"%b %_d").*?[UFW BLOCK].*?IN=([^ ]*) OUT=([^ ]*) .*?SRC=([^ ]*) DST=([^ ]*) .*?SPT=([^ ]*) DPT=([^ ]*).*$/,1,2,3,4,5,6/;t;d" /var/log/ufw.log | sort | uniq -c | sort -nr | awk -F"," '{
inOrOut=$2==""?($3==""?"unknown":"out"):"in"
cmd=sprintf("nslookup %s 2>/dev/null | sed -r -e "s/^.*name = (.*).$/\1/;t;d"", $4)
cmd | getline sourceName
close(cmd)
cmd=sprintf("nslookup %s 2>/dev/null | sed -r -e "s/^.*name = (.*).$/\1/;t;d"", $5)
cmd | getline destinationName
close(cmd)
printf "<tr><td>%s</td><td>%s</td><td>%s (%s)</td><td>%s (%s)</td><td>%s</td><td>%s</td></tr>n", $1, inOrOut, $4, sourceName, $5, destinationName, $6, $7
}';
echo '</table>';
echo '<br>';
echo '<br>';
echo '</body>';
echo '</html>';
I have a daily cron job that runs this script and sends as HTML email.
This results in a table like so:
| count | in or out | source IP | destination IP | source port | destination port |
|-------|-----------|-----------------------|-----------------------|-------------|------------------|
| 3 | out | 192.168.1.100 (host1) | 192.168.1.101 (host2) | 100 | 400 |
| 1 | in | 192.168.1.101 (host2) | 192.168.1.100 (host1) | 200 | 500 |
| 1 | out | 192.168.1.100 (host1) | 192.168.1.100 (host1) | 300 | 600 |
answered Feb 8 at 14:00
IMTheNachoManIMTheNachoMan
257212
add a comment |
0
0
0
I could not find an answer I liked so per @heynnema's advice, I am capturing what I want from /var/log/ufw.log and formatting into a table for e-mail.
echo '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">';
echo '<html>';
echo '<head>';
echo '<title></title>';
echo '<style>table, th, td { border: 1px solid black; border-collapse: collapse; padding: 2px;}</style>';
echo '</head>';
echo '<body>';
echo '<table>';
echo '<tr><th>count</th><th>in or out</th><th>source IP</th><th>destination IP</th><th>source port</th><th>destination port</th></tr>';
# get all lines from yesterday
# capture the relevant data: IN, OUT, SRC, DST, SPT, and DPT
# send to awk
# get hostname for SRC and DST
# print everything as a table
sed -r "s/^$(date --date=yesterday +"%b %_d").*?[UFW BLOCK].*?IN=([^ ]*) OUT=([^ ]*) .*?SRC=([^ ]*) DST=([^ ]*) .*?SPT=([^ ]*) DPT=([^ ]*).*$/,1,2,3,4,5,6/;t;d" /var/log/ufw.log | sort | uniq -c | sort -nr | awk -F"," '{
inOrOut=$2==""?($3==""?"unknown":"out"):"in"
cmd=sprintf("nslookup %s 2>/dev/null | sed -r -e "s/^.*name = (.*).$/\1/;t;d"", $4)
cmd | getline sourceName
close(cmd)
cmd=sprintf("nslookup %s 2>/dev/null | sed -r -e "s/^.*name = (.*).$/\1/;t;d"", $5)
cmd | getline destinationName
close(cmd)
printf "<tr><td>%s</td><td>%s</td><td>%s (%s)</td><td>%s (%s)</td><td>%s</td><td>%s</td></tr>n", $1, inOrOut, $4, sourceName, $5, destinationName, $6, $7
}';
echo '</table>';
echo '<br>';
echo '<br>';
echo '</body>';
echo '</html>';
I have a daily cron job that runs this script and sends as HTML email.
This results in a table like so:
| count | in or out | source IP | destination IP | source port | destination port |
|-------|-----------|-----------------------|-----------------------|-------------|------------------|
| 3 | out | 192.168.1.100 (host1) | 192.168.1.101 (host2) | 100 | 400 |
| 1 | in | 192.168.1.101 (host2) | 192.168.1.100 (host1) | 200 | 500 |
| 1 | out | 192.168.1.100 (host1) | 192.168.1.100 (host1) | 300 | 600 |
answered Feb 8 at 14:00
IMTheNachoManIMTheNachoMan
257212
I could not find an answer I liked so per @heynnema's advice, I am capturing what I want from /var/log/ufw.log and formatting into a table for e-mail.
echo '<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">';
echo '<html>';
echo '<head>';
echo '<title></title>';
echo '<style>table, th, td { border: 1px solid black; border-collapse: collapse; padding: 2px;}</style>';
echo '</head>';
echo '<body>';
echo '<table>';
echo '<tr><th>count</th><th>in or out</th><th>source IP</th><th>destination IP</th><th>source port</th><th>destination port</th></tr>';
# get all lines from yesterday
# capture the relevant data: IN, OUT, SRC, DST, SPT, and DPT
# send to awk
# get hostname for SRC and DST
# print everything as a table
sed -r "s/^$(date --date=yesterday +"%b %_d").*?[UFW BLOCK].*?IN=([^ ]*) OUT=([^ ]*) .*?SRC=([^ ]*) DST=([^ ]*) .*?SPT=([^ ]*) DPT=([^ ]*).*$/,1,2,3,4,5,6/;t;d" /var/log/ufw.log | sort | uniq -c | sort -nr | awk -F"," '{
inOrOut=$2==""?($3==""?"unknown":"out"):"in"
cmd=sprintf("nslookup %s 2>/dev/null | sed -r -e "s/^.*name = (.*).$/\1/;t;d"", $4)
cmd | getline sourceName
close(cmd)
cmd=sprintf("nslookup %s 2>/dev/null | sed -r -e "s/^.*name = (.*).$/\1/;t;d"", $5)
cmd | getline destinationName
close(cmd)
printf "<tr><td>%s</td><td>%s</td><td>%s (%s)</td><td>%s (%s)</td><td>%s</td><td>%s</td></tr>n", $1, inOrOut, $4, sourceName, $5, destinationName, $6, $7
}';
echo '</table>';
echo '<br>';
echo '<br>';
echo '</body>';
echo '</html>';
I have a daily cron job that runs this script and sends as HTML email.
This results in a table like so:
| count | in or out | source IP | destination IP | source port | destination port |
|-------|-----------|-----------------------|-----------------------|-------------|------------------|
| 3 | out | 192.168.1.100 (host1) | 192.168.1.101 (host2) | 100 | 400 |
| 1 | in | 192.168.1.101 (host2) | 192.168.1.100 (host1) | 200 | 500 |
| 1 | out | 192.168.1.100 (host1) | 192.168.1.100 (host1) | 300 | 600 |
answered Feb 8 at 14:00
IMTheNachoManIMTheNachoMan
257212
answered Feb 8 at 14:00
IMTheNachoManIMTheNachoMan
257212
answered Feb 8 at 14:00
IMTheNachoManIMTheNachoMan
257212
answered Feb 8 at 14:00
IMTheNachoManIMTheNachoMan
257212
257212
add a comment |
add a comment |
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I don't quite understand the need to lock down your system like this. It's totally crippled your system. Any emails, digest or otherwise, would be constant, and huge. Please explain.
– heynnema
Feb 6 at 19:01
It's a home server I use to play around with and learn on. I have a lot of ports explicitly opened like HTTP and HTTPS out so
aptworks. I want to know everything going in and out of the system that I haven't explicitly allowed.– IMTheNachoMan
Feb 6 at 19:04
You can just start with a simple
grep -i ufw /var/log/syslogormore /var/log/ufw.logto see what you're getting into. Then, if you're convinced that you REALLY want to see all of this noise, pipe either output into a mail message.– heynnema
Feb 6 at 19:17
That is what I was thinking of doing but thought maybe UFW has a built in way to do it. I can set a daily cron job to create a report and send me email.
– IMTheNachoMan
Feb 6 at 20:13