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Dockerfile
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# Copyright 2020-2022 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
FROM ubuntu:22.04 as chroot
RUN /usr/sbin/useradd --no-create-home -u 1000 user
RUN apt-get update && apt-get install -y python3 python3-pip git
WORKDIR /home/user
RUN git clone https://github.com/sympy/sympy
WORKDIR /home/user/sympy
# something recent
RUN git checkout 7716f42
RUN python3 setup.py install
COPY flag /
COPY run.sh /home/user/
COPY main.py /home/user/sympy/
FROM gcr.io/kctf-docker/challenge@sha256:d884e54146b71baf91603d5b73e563eaffc5a42d494b1e32341a5f76363060fb
COPY --from=chroot / /chroot
COPY nsjail.cfg /home/user/
CMD kctf_setup && \
kctf_drop_privs \
socat \
TCP-LISTEN:1337,reuseaddr,fork \
EXEC:"kctf_pow nsjail --config /home/user/nsjail.cfg -- /home/user/run.sh"