Find out which process steadily creates new outgoing ssh connections
up vote
0
down vote
favorite
I'm trying to figure out which process is flooding the system with outgoing ssh connections. I know that netstat can be used for this, but it doesn't show me the pid of such a connection. Also, the connections are all in the TIME_WAIT state. Executing the command
root@debian:~# netstat -taupent | grep "Inode|192.168.0.9:(4|5).*"
displays the following output
Proto Recv-Q Send-Q Local Address Foreign Address State Benutzer Inode PID/Program name
tcp 0 0 192.168.0.9:57592 192.168.0.2:22 TIME_WAIT 0 0 -
tcp 0 0 192.168.0.9:57590 192.168.0.2:22 TIME_WAIT 0 0 -
tcp 0 0 192.168.0.9:57588 192.168.0.2:22 TIME_WAIT 0 0 -
tcp 0 0 192.168.0.9:57594 192.168.0.2:22 TIME_WAIT 0 0 -
After a minute the same command gives me new connections with different ports. These ports are also not listed in the lsof -i :<port> output.
I've added a rule in iptables -A OUTPUT -p tcp -m tcp --dport 22 -j LOG --log-prefix "ssh connection" in the hope to get some more information, but I'm not seeing anything in the log output that helps me to solve my problem. Here is a sample log entry:
[1944832.763717] ssh connectionIN= OUT=enp0s3 SRC=192.168.0.9 DST=192.168.0.2 LEN=52 TOS=0x08 PREC=0x00 TTL=64 ID=54394 DF PROTO=TCP SPT=59532 DPT=22 WINDOW=431 RES=0x00 ACK URGP=0
Any help appreciated!
System Info:
Icon name: computer-vm
Chassis: vm
Virtualization: oracle
Operating System: Debian GNU/Linux 9 (stretch)
Kernel: Linux 4.9.0-8-amd64
Architecture: x86-64
linux ssh netstat
asked Dec 3 at 10:42
dejard
1
add a comment |
up vote
0
down vote
favorite
I'm trying to figure out which process is flooding the system with outgoing ssh connections. I know that netstat can be used for this, but it doesn't show me the pid of such a connection. Also, the connections are all in the TIME_WAIT state. Executing the command
root@debian:~# netstat -taupent | grep "Inode|192.168.0.9:(4|5).*"
displays the following output
Proto Recv-Q Send-Q Local Address Foreign Address State Benutzer Inode PID/Program name
tcp 0 0 192.168.0.9:57592 192.168.0.2:22 TIME_WAIT 0 0 -
tcp 0 0 192.168.0.9:57590 192.168.0.2:22 TIME_WAIT 0 0 -
tcp 0 0 192.168.0.9:57588 192.168.0.2:22 TIME_WAIT 0 0 -
tcp 0 0 192.168.0.9:57594 192.168.0.2:22 TIME_WAIT 0 0 -
After a minute the same command gives me new connections with different ports. These ports are also not listed in the lsof -i :<port> output.
I've added a rule in iptables -A OUTPUT -p tcp -m tcp --dport 22 -j LOG --log-prefix "ssh connection" in the hope to get some more information, but I'm not seeing anything in the log output that helps me to solve my problem. Here is a sample log entry:
[1944832.763717] ssh connectionIN= OUT=enp0s3 SRC=192.168.0.9 DST=192.168.0.2 LEN=52 TOS=0x08 PREC=0x00 TTL=64 ID=54394 DF PROTO=TCP SPT=59532 DPT=22 WINDOW=431 RES=0x00 ACK URGP=0
Any help appreciated!
System Info:
Icon name: computer-vm
Chassis: vm
Virtualization: oracle
Operating System: Debian GNU/Linux 9 (stretch)
Kernel: Linux 4.9.0-8-amd64
Architecture: x86-64
linux ssh netstat
asked Dec 3 at 10:42
dejard
1
2
TIME_WAITis explained here. You may try this approach applied tossh(instead ofrm).
– Kamil Maciorowski
Dec 3 at 11:38
@KamilMaciorowski It worked,thank you very much! And btw, really nice trick!
– dejard
Dec 4 at 7:00
add a comment |
up vote
0
down vote
favorite
up vote
0
down vote
favorite
I'm trying to figure out which process is flooding the system with outgoing ssh connections. I know that netstat can be used for this, but it doesn't show me the pid of such a connection. Also, the connections are all in the TIME_WAIT state. Executing the command
root@debian:~# netstat -taupent | grep "Inode|192.168.0.9:(4|5).*"
displays the following output
Proto Recv-Q Send-Q Local Address Foreign Address State Benutzer Inode PID/Program name
tcp 0 0 192.168.0.9:57592 192.168.0.2:22 TIME_WAIT 0 0 -
tcp 0 0 192.168.0.9:57590 192.168.0.2:22 TIME_WAIT 0 0 -
tcp 0 0 192.168.0.9:57588 192.168.0.2:22 TIME_WAIT 0 0 -
tcp 0 0 192.168.0.9:57594 192.168.0.2:22 TIME_WAIT 0 0 -
After a minute the same command gives me new connections with different ports. These ports are also not listed in the lsof -i :<port> output.
I've added a rule in iptables -A OUTPUT -p tcp -m tcp --dport 22 -j LOG --log-prefix "ssh connection" in the hope to get some more information, but I'm not seeing anything in the log output that helps me to solve my problem. Here is a sample log entry:
[1944832.763717] ssh connectionIN= OUT=enp0s3 SRC=192.168.0.9 DST=192.168.0.2 LEN=52 TOS=0x08 PREC=0x00 TTL=64 ID=54394 DF PROTO=TCP SPT=59532 DPT=22 WINDOW=431 RES=0x00 ACK URGP=0
Any help appreciated!
System Info:
Icon name: computer-vm
Chassis: vm
Virtualization: oracle
Operating System: Debian GNU/Linux 9 (stretch)
Kernel: Linux 4.9.0-8-amd64
Architecture: x86-64
linux ssh netstat
asked Dec 3 at 10:42
dejard
1
I'm trying to figure out which process is flooding the system with outgoing ssh connections. I know that netstat can be used for this, but it doesn't show me the pid of such a connection. Also, the connections are all in the TIME_WAIT state. Executing the command
root@debian:~# netstat -taupent | grep "Inode|192.168.0.9:(4|5).*"
displays the following output
Proto Recv-Q Send-Q Local Address Foreign Address State Benutzer Inode PID/Program name
tcp 0 0 192.168.0.9:57592 192.168.0.2:22 TIME_WAIT 0 0 -
tcp 0 0 192.168.0.9:57590 192.168.0.2:22 TIME_WAIT 0 0 -
tcp 0 0 192.168.0.9:57588 192.168.0.2:22 TIME_WAIT 0 0 -
tcp 0 0 192.168.0.9:57594 192.168.0.2:22 TIME_WAIT 0 0 -
After a minute the same command gives me new connections with different ports. These ports are also not listed in the lsof -i :<port> output.
I've added a rule in iptables -A OUTPUT -p tcp -m tcp --dport 22 -j LOG --log-prefix "ssh connection" in the hope to get some more information, but I'm not seeing anything in the log output that helps me to solve my problem. Here is a sample log entry:
[1944832.763717] ssh connectionIN= OUT=enp0s3 SRC=192.168.0.9 DST=192.168.0.2 LEN=52 TOS=0x08 PREC=0x00 TTL=64 ID=54394 DF PROTO=TCP SPT=59532 DPT=22 WINDOW=431 RES=0x00 ACK URGP=0
Any help appreciated!
System Info:
Icon name: computer-vm
Chassis: vm
Virtualization: oracle
Operating System: Debian GNU/Linux 9 (stretch)
Kernel: Linux 4.9.0-8-amd64
Architecture: x86-64
linux ssh netstat
linux ssh netstat
asked Dec 3 at 10:42
dejard
1
asked Dec 3 at 10:42
dejard
1
asked Dec 3 at 10:42
dejard
1
asked Dec 3 at 10:42
dejard
1
asked Dec 3 at 10:42
dejard
1
1
2
TIME_WAITis explained here. You may try this approach applied tossh(instead ofrm).
– Kamil Maciorowski
Dec 3 at 11:38
@KamilMaciorowski It worked,thank you very much! And btw, really nice trick!
– dejard
Dec 4 at 7:00
add a comment |
2
TIME_WAITis explained here. You may try this approach applied tossh(instead ofrm).
– Kamil Maciorowski
Dec 3 at 11:38
@KamilMaciorowski It worked,thank you very much! And btw, really nice trick!
– dejard
Dec 4 at 7:00
2
2
TIME_WAIT is explained here. You may try this approach applied to ssh (instead of rm).– Kamil Maciorowski
Dec 3 at 11:38
TIME_WAIT is explained here. You may try this approach applied to ssh (instead of rm).– Kamil Maciorowski
Dec 3 at 11:38
@KamilMaciorowski It worked,thank you very much! And btw, really nice trick!
– dejard
Dec 4 at 7:00
@KamilMaciorowski It worked,thank you very much! And btw, really nice trick!
– dejard
Dec 4 at 7:00
add a comment |
active
oldest
votes
Your Answer
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "3"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fsuperuser.com%2fquestions%2f1380368%2ffind-out-which-process-steadily-creates-new-outgoing-ssh-connections%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
active
oldest
votes
active
oldest
votes
active
oldest
votes
active
oldest
votes
Thanks for contributing an answer to Super User!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Some of your past answers have not been well-received, and you're in danger of being blocked from answering.
Please pay close attention to the following guidance:
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fsuperuser.com%2fquestions%2f1380368%2ffind-out-which-process-steadily-creates-new-outgoing-ssh-connections%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
2
TIME_WAITis explained here. You may try this approach applied tossh(instead ofrm).– Kamil Maciorowski
Dec 3 at 11:38
@KamilMaciorowski It worked,thank you very much! And btw, really nice trick!
– dejard
Dec 4 at 7:00