Update Dockerfile + add Docker build instructions

Dockerfile

@@ -0,0 +1,69 @@
+# Using Ubuntu 18.04 image
+FROM ubuntu:18.04
+
+USER root
+
+# Copy the current directory contents into the container
+RUN mkdir -p /mc2/opaque-sql
+COPY . /mc2/opaque-sql
+
+# Install wget
+RUN apt-get update
+RUN apt-get install -y wget sudo gnupg2 git
+RUN useradd -m docker && echo "docker:docker" | chpasswd && adduser docker sudo
+
+# Install CMake
+RUN cd /mc2 && \
+    wget https://github.com/Kitware/CMake/releases/download/v3.15.6/cmake-3.15.6-Linux-x86_64.sh && \
+    sudo bash cmake-3.15.6-Linux-x86_64.sh --skip-license --prefix=/usr/local 
+
+# Configure Intel and Microsoft APT repos
+RUN echo 'deb [arch=amd64] https://download.01.org/intel-sgx/sgx_repo/ubuntu bionic main' | sudo tee /etc/apt/sources.list.d/intel-sgx.list && \
+    wget -qO - https://download.01.org/intel-sgx/sgx_repo/ubuntu/intel-sgx-deb.key | sudo apt-key add - && \
+    echo "deb http://apt.llvm.org/bionic/ llvm-toolchain-bionic-7 main" | sudo tee /etc/apt/sources.list.d/llvm-toolchain-bionic-7.list && \
+    wget -qO - https://apt.llvm.org/llvm-snapshot.gpg.key | sudo apt-key add - && \
+    echo "deb [arch=amd64] https://packages.microsoft.com/ubuntu/18.04/prod bionic main" | sudo tee /etc/apt/sources.list.d/msprod.list && \
+    wget -qO - https://packages.microsoft.com/keys/microsoft.asc | sudo apt-key add - && \
+    sudo apt update
+
+# Install Intel and Open Enclave packages and dependencies
+RUN sudo apt -y install clang-8 libssl-dev gdb libsgx-enclave-common libsgx-quote-ex libprotobuf10 libsgx-dcap-ql libsgx-dcap-ql-dev az-dcap-client open-enclave=0.12.0
+
+# Install SBT dependencies
+RUN sudo apt -y install build-essential openjdk-8-jdk python libssl-dev libmbedtls-dev
+
+# Install Spark 3.1.1
+RUN wget https://downloads.apache.org/spark/spark-3.1.1/spark-3.1.1-bin-hadoop2.7.tgz && \
+    tar xvf spark-3.1.1* && \
+    sudo mkdir -p /opt/spark && \
+    sudo mv spark-3.1.1*/* /opt/spark && \
+    rm -rf spark-3.1.1* && \
+    sudo mkdir -p /opt/spark/work && \
+    sudo chmod -R a+wx /opt/spark/work
+
+# Set Spark environment variables in bashrc
+RUN echo "" >> ~/.bashrc && \
+    echo "# Spark settings" >> ~/.bashrc && \
+    echo "export SPARK_HOME=/opt/spark" >> ~/.bashrc && \
+    echo "export PATH=$PATH:/opt/spark/bin:/opt/spark/sbin" >> ~/.bashrc && \
+    echo "" >> ~/.bashrc
+
+# Source Open Enclave on every login
+RUN echo "source /opt/openenclave/share/openenclave/openenclaverc" >> ~/.bashrc
+
+# Set environment variables
+ENV OPAQUE_HOME="/mc2/opaque-sql"
+ENV OPAQUE_DATA_DIR=${OPAQUE_HOME}/data/
+ENV SPARK_SCALA_VERSION=2.12
+ENV SYMMETRIC_KEY_PATH=${OPAQUE_HOME}/symmetric_key.key
+ENV PRIVATE_KEY_PATH=${OPAQUE_HOME}/private_key.pem
+ENV MODE=SIMULATE
+ENV OE_SDK_PATH=/opt/openenclave/
+
+# Build Opaque SQL
+SHELL ["/bin/bash", "-c"]
+RUN cd /mc2/opaque-sql && source /opt/openenclave/share/openenclave/openenclaverc && build/sbt keys
+RUN cd /mc2/opaque-sql && source /opt/openenclave/share/openenclave/openenclaverc && build/sbt package
+
+# Set the working directory to the Opaque SQL directory
+WORKDIR /mc2/opaque-sql

README.md

@@ -7,23 +7,17 @@
 Welcome to the landing page of Opaque SQL! Opaque SQL is a package for Apache Spark SQL that enables processing over encrypted DataFrames using the OpenEnclave framework. 
 
 ### Quick start
-To quickly get started with Opaque SQL, you can download our Docker image (also includes other open source projects in the MC<sup>2</sup> project).
+To quickly get started with Opaque SQL, you can build a Docker container from the provided [Dockerfile](Dockerfile). To do so, you must have [Docker](https://docs.docker.com/get-docker/) installed. We recommend giving Docker at least 2 CPUs, 6 GB of memory, and 2 GB of swap space (instructions for [Mac](https://docs.docker.com/docker-for-mac/#resources), [Windows](https://docs.docker.com/docker-for-windows/#resources)). The entire Docker build process should take about 5 minutes.
 
 ```sh
-docker pull mc2project/mc2
-docker run -it -p 22:22 -p 50051-50055:50051-50055 -w /root mc2project/mc2
-```
-
-Change into the Opaque directory and export the Opaque and OpenEnclave environment variables.
+# In the project root directory, build a Docker image `opaquesql_img` from the Dockerfile
+docker build -t opaquesql_img .
 
-```sh
-cd opaque
-source opaqueenv
-source /opt/openenclave/share/openenclave/openenclaverc
-export MODE=SIMULATE
+# Run a container with Opaque SQL pre-installed
+docker run -it opaquesql_img /bin/bash
 ```
 
-You are now ready to run your first Opaque SQL query! First, start a Scala shell:
+This will start a container with Opaque SQL pre-installed and built in simulation mode. You are now ready to run your first Opaque SQL query! First, start a Scala shell:
 
 ```sh
 build/sbt console