il
a05951f883
update notes: - add http_status and http_verb for each expressions (actual budget, immich, opencloud) - fix crowdsec and issues documents
34 lines
1.1 KiB
Markdown
34 lines
1.1 KiB
Markdown
# OpenCloud crowdsec false positive issue
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## Status
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- Finished
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## Date
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- 2026-04-04
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## Version
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- OpenCloud: 4.0.4
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## Problem
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- When users download some files, all connections to homelab services are refused.
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- fw ban users' IP address.
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## Reason
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- OpenCloud uses chunks when clients uploads or download files to it.
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- LAPI decides a ban when a lot of chunks file is uploaded or downloaded from external devices
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## Timeline
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- 2026-04-04: Release OpenCloud
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- 2026-04-04: Find the false positive case, and add whitelist
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- 2026-05-07: Optimize whitelist expression
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## Solution
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- Access to fw
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- Check the ban list with `sudo cscli alerts list`
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- Read the ban case with `sudo cscli alerts inspect $NUMBER`
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- Add expressions on whitelist
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- evt.Meta.target_fqdn == '{{ services['opencloud']['domain']['public'] }}.{{ domain['public'] }}' && evt.Meta.http_status in ['200', '304'] && evt.Meta.http_verb == 'GET' && evt.Meta.http_path contains '/js/chunks/'
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- Delete false positive decision
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- Check false positive decision with `sudo cscli decision list`
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- Delete false positive decision with `sudo cscli decision delete --id $ID`
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