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fix: grant cap_net_raw to scanner binaries for non-root execution #35

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Merged
reloadfast merged 1 commit into from
Feb 28, 2026
Merged

fix: grant cap_net_raw to scanner binaries for non-root execution #35

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9 changes: 8 additions & 1 deletion docker/Dockerfile
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Original file line number Diff line number Diff line change
Expand Up @@ -33,13 +33,20 @@ LABEL org.opencontainers.image.title="NetworkCrawler" \
org.opencontainers.image.vendor="talesofthemoon" \
org.opencontainers.image.licenses="MIT"

# Install system-level scanning tools
# Install system-level scanning tools + libcap2-bin for setcap
RUN apt-get update \
&& apt-get install -y --no-install-recommends \
nmap \
arp-scan \
libcap2-bin \
&& rm -rf /var/lib/apt/lists/*

# Grant cap_net_raw to the scanner binaries so they can open raw sockets when
# running as non-root uid 1000. --cap-add=NET_RAW at runtime puts NET_RAW in
# the bounding set; setcap +ep promotes it to the effective set on exec.
RUN setcap cap_net_raw+ep /usr/sbin/arp-scan \
&& setcap cap_net_raw+ep "$(which nmap)"

# Create a dedicated non-root user
RUN groupadd --gid 1000 crawler \
&& useradd --uid 1000 --gid crawler --no-create-home --shell /usr/sbin/nologin crawler
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