Cherry-pick #14004 to 7.4: [SIEM] Add DNS enrichment to system/socket dataset #14065
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This patch adds DNS monitoring to the system/socket dataset so that events can be enriched with domain names. Its been implemented using af_packet so that filtering can be used at the kernel level and only DNS responses are copied to userspace. In the future it might be possible to use a kprobes-based implementation which will make correlating DNS requests to processes much easier, but we need to find out how to filter DNS requests at kprobe level, given that sometimes is necessary to inspect the packet to obtain the source port. (cherry picked from commit ed9dba5)
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Not backporting a feature to 7.4.1 :) |
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Cherry-pick of PR #14004 to 7.4 branch. Original message:
This patch adds DNS monitoring to the system/socket dataset so that events can be enriched with domain names.
Its been implemented using af_packet so that filtering can be used at the kernel level and only DNS responses are copied to userspace.
In the future it might be possible to use a kprobes-based implementation which will make correlating DNS requests to processes much easier, but we need to find out how to filter DNS requests at kprobe level, given that sometimes is necessary to inspect the packet to obtain the source port.