mirror of
https://github.com/freedomofpress/dangerzone.git
synced 2025-04-28 18:02:38 +02:00
d16961bed6
Only load the LibreOffice extension for opening hwp/hwpx when it is actually needed. Adding an extension to libreoffice may allow for it to run arbitrary code. This makes it trust more scalable by trusting LibreOffice extensions only for the filetypes which they target. Reasoning --------- Assuming a malicious `.oxt` extension this means that the extension has arbitrary code execution in the container. While this is not an existential threat in itself, we should not expose every Dangerzone user to it. This is achieved by dynamically loading the extension at runtime only when needed. This ensures that a compromised extension will in its least malicious form be able to modify the visual content of any hancom office files but not *every file*. In the more malicious version, if the code execution manages to do a container escape, this will only affect users that have converted a Hancom office file.
60 lines
2.4 KiB
Docker
60 lines
2.4 KiB
Docker
FROM alpine:latest
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ARG TESSDATA_CHECKSUM=990fffb9b7a9b52dc9a2d053a9ef6852ca2b72bd8dfb22988b0b990a700fd3c7
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ARG H2ORESTART_CHECKSUM=5db816a1e57b510456633f55e693cb5ef3675ef8b35df4f31c90ab9d4c66071a
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# Install dependencies
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RUN apk --no-cache -U upgrade && \
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apk --no-cache add \
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ghostscript \
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graphicsmagick \
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libreoffice \
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openjdk8 \
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poppler-utils \
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poppler-data \
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python3 \
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py3-magic \
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tesseract-ocr \
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font-noto-cjk
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# Download the trained models from the latest GitHub release of Tesseract, and
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# store them under /usr/share/tessdata. This is basically what distro packages
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# do under the hood.
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#
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# Because the GitHub release contains more files than just the trained models,
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# we use `find` to fetch only the '*.traineddata' files in the top directory.
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#
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# Before we untar the models, we also check if the checksum is the expected one.
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RUN mkdir tessdata && cd tessdata \
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&& TESSDATA_VERSION=$(wget -O- -nv https://api.github.com/repos/tesseract-ocr/tessdata/releases/latest \
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| sed -n 's/^.*"tag_name": "\([0-9.]\+\)".*$/\1/p') \
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&& wget https://github.com/tesseract-ocr/tessdata/archive/$TESSDATA_VERSION/tessdata-$TESSDATA_VERSION.tar.gz \
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&& echo "$TESSDATA_CHECKSUM tessdata-$TESSDATA_VERSION.tar.gz" | sha256sum -c \
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&& tar -xzvf tessdata-$TESSDATA_VERSION.tar.gz -C . \
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&& find . -name '*.traineddata' -maxdepth 2 -exec cp {} /usr/share/tessdata \; \
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&& cd .. && rm -r tessdata
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RUN mkdir /libreoffice_ext && cd libreoffice_ext \
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&& H2ORESTART_FILENAME=h2orestart.oxt \
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&& H2ORESTART_VERSION="v0.5.7" \
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&& wget https://github.com/ebandal/H2Orestart/releases/download/$H2ORESTART_VERSION/$H2ORESTART_FILENAME \
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&& echo "$H2ORESTART_CHECKSUM $H2ORESTART_FILENAME" | sha256sum -c \
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&& install -dm777 "/usr/lib/libreoffice/share/extensions/"
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ENV PYTHONPATH=/opt/dangerzone
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RUN mkdir -p /opt/dangerzone/dangerzone
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RUN touch /opt/dangerzone/dangerzone/__init__.py
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COPY conversion /opt/dangerzone/dangerzone/conversion
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# Add the unprivileged user
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RUN adduser -s /bin/sh -D dangerzone
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USER dangerzone
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# /tmp/input_file is where the first convert expects the input file to be, and
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# /tmp where it will write the pixel files
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#
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# /dangerzone is where the second script expects files to be put by the first one
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#
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# /safezone is where the wrapper eventually moves the sanitized files.
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VOLUME /dangerzone /tmp/input_file /safezone
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