2022-02-01 20:34:39 +00:00
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---
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keywords:
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- IT
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---
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2022-01-17 07:33:46 +00:00
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# systemd cheat sheet
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## ssh systemd rerverse shell as service
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2022-01-17 08:22:46 +00:00
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- persistent reverse SSH connection with systemd
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2022-01-17 07:33:46 +00:00
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```
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-g Allows remote hosts to connect to local forwarded ports
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-N Do not execute a remote command
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-T Disable pseudo-terminal allocation
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-o Used to give options in the format used in the configuration file (man ssh_config)
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ServerAliveInterval Interval in seconds to ping the server while connection has been inactive
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ExitOnForwardFailure Whether to terminate the connection if it cannot set up all requested port forwards
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-R Forward given remote TCP port (22221) to the local port (22)
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-v Verbose mode. More v's increase verbosity.
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```
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the specific unit file to place under: `/etc/systemd/system/ssh-reverse.service`
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```
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[Unit]
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Description=Reverse SSH connection
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After=network.target
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[Service]
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Type=simple
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ExecStart=/usr/bin/ssh -vvv -g -N -T -o "ServerAliveInterval 10" -o "ExitOnForwardFailure yes" -R 22221:localhost:22 {target_IP}
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Restart=always
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RestartSec=5s
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[Install]
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WantedBy=default.target
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```
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credits belongs to blog.stigok.com
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