This is a refactor of Travis F. Smith's SweetSecurity repository for building a defensible Raspberry Pi. User should have sudo privileges to install software and situate configuration files on the filesystem.

• Upgraded versions of Bro and ELK stack to current
• Changed from hardcoded pi user to configurable working directory INSTALL_DIR
• Reduced privileges where possible to run commands unprivileged as the user
• Silenced echo of Critical Stack API key and email password with read -s
• Moved logical groupings of code into individual functions
• Added integrity verification of downloads where possible: Bro (signature), ELK (SHA-1)
• Submitted ticket to Critical Stack to add their deb into their repository with signing key and signature
• Ported deprecated init code (update-rc.d, service, etc) to systemd current equivalent with systemctl
• Created start_kibana and stop_kibana scripts for use with systemd invokation
• Replaced deprecated init.d/kibana with current system/kibana.service
• Exported intel.criticalstack.com certificate for use with Critical Stack deb download
• Commented out code for blacklisting Tor exit nodes. Use Signal. Use Tor.

A number of issues and pull requests are sitting Open on the original repository so some of the issues were addressed.

• Optimized and fixed logstash.conf user value substitution (TravisFSmith#10)
• Removed networkDiscovery.py and SweetSecurityDB.py as they were not utilized (TravisFSmith#11)
• Condensed directory creation with mkdir -p (https://github.com/TravisFSmith/SweetSecurity/pull/8/commits/19dc0f8d1c5b579a8edec971310559823e9c1f91)
• Added variables for software versions (https://github.com/TravisFSmith/SweetSecurity/pull/8/commits/4135d8932d1cf77b49bafce9d876bdeeecd3305c https://github.com/TravisFSmith/SweetSecurity/pull/8/commits/7830f7cd629e573dd777a2d031fe3041ec972561 https://github.com/TravisFSmith/SweetSecurity/pull/8/commits/593266c4b05de56b4a435e3d038d7c5f485ce386 https://github.com/TravisFSmith/SweetSecurity/pull/8/commits/6b1aa3723419a69d78700c5a0f8cb95b3aec44a8)
• Added git-core and default-jdk to dependencies (https://github.com/TravisFSmith/SweetSecurity/pull/9/commits/5ac54197eaecf50b781f7cc0d4ffe725e8a102ed)