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#!/usr/bin/sudo sh
## ruby_revealer.sh -- decrypt obfuscated GHE .rb files. 2.0.0 to 2.3.1+.
## From `strings ruby_concealer.so`:
##
## > This obfuscation is intended to discourage GitHub Enterprise customers
## > from making modifications to the VM.
##
## Well, good, as long as its not intended to discourage *me* from doing this!
## After all, I'm not a GitHub Enterprise customer. I'm just some dude who
## grabbed the .ova file off the internet!
##
## > We know this 'encryption' is easily broken.
##
## Err, yeah. Just do a binary `s/eval/puts/`. Like this!
# So...
# A version of the ruby_concealer.so with just such a patch, xz'd and base64'd.
ruby_revealer_so='
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ROPqGF4BK8iO58okHz/aQBKgdFnoyLCWvsY5P+x4agRvYbapHKdkG3dpcZVDSecYOXTgVPaH+ln47d
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IrAudhrn9c8cz4dWtMYqIRZj+IGeTr+QmA+8ygIsrSDd03CNMfOQBrK00EV5TpivScHRyLiW+24gVv
xocvTlT+9F8XoLWwitCKRkf76+6znd/6kFDJgQ3gIcPEaxlfRFTw6VIfYnv3fY1VhvASnhLwe6hLNt
nT+wkgHfAKZR7MJ+SWV5rjorO2NLrQBZWhL1LO/XSt7LnlwurkpyNjk1xpVb9EeCbbqTMhfMW/VQKx
uqJNZhAb2KU7y1YFubKl024DyWuOtghGQ5ZZKtmfDwpib7KYN6VrlwGsGRP/N3bDqvcs72ylXhbGR8
HnyGTlwQL11pqWWnhJBJET2VkpYwNAOJ+m0+BX/Ej0bcDSGMQhbhQ75b8BHVsd/5Hbx/B7mb0cq7O4
50QECkanmBVRZ8ZROFgIGJHiYp6kC+zOOcQ8Roy5tCrThmB5fN9Fti5wZspVoUOYddyKbCyX4DBrNJ
u3IL+mwXHrC8hk7s71QrxJ+AtrhBhxaGLHe6xb+jy5uvoUH8Ywicq0GNKeFoo1kgELu2/JJr0omBI4
UKTWgG6qlRiXVspnZd3xpuWky0BKRVHf1KEXy+LFUYEkVe6prP8QT1mT/xCQuPod72INU7b0VEAQ6n
X6iavj+5dbg2ZbWDO/yiqnVKkogodr5E5iUtinu+X0eKPJJflvTUZGBqKNxiZO9i3wvCpoZ5GoI89J
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24e/r9APRskRS1BLO1bI1c9kvozyNZ8MVj9oZ/mDCVXdxBqxXQSyHib5HIQaBHerD1QxziBU68KXet
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990Lxacz6FxvQh0VqEHPG8VNBd3QopN/v50cgs9AJtLatKhfZHLLVXvFA1N4yyBysl0eBqKhSHS+mQ
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TUYD2p1H6v6UO46HRwsvK8+v90q6lMzPEp5ejfFWBK0YAC7xEBk+egqWndZ9XpZ9P3EMkPwvgJK6+R
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NTFR1hbhZobbAf4anPp5ewTYlcQQcsnswfeMywClTMdThS3X0BxUbuPwjl9h6hnmN2LWk0cH/Rr6Gc
l5jpZr1dFGXYpVyaA7zFfVry/2hSPHUpZJeb+amqAZqd6RUocj5d1oKwfJ5D7tjJMkgfQ4aiV5XGQL
EhPXzVaJXkk2PwQhRgUyh+cAvQWjOt+smlpAHTLnW7b8r0/1V1aJPmN9OMI5tshQD9UvkWCbpIg0cu
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HEZ/sCAAAAAARZWg=='
# Find the existing .so (don't hardcode it).
ruby_concealer_so=$(find / -name ruby_concealer.so)
# Find the corresponding ruby and put it in our PATH.
export PATH=$(echo $ruby_concealer_so | sed s'|lib.*|bin|'):$PATH
# Backup the original file.
mv $ruby_concealer_so $ruby_concealer_so.bak
# Overwrite the original.
echo "$ruby_revealer_so" | base64 --decode | xz -dc > $ruby_concealer_so
touch -r $ruby_concealer_so.bak $ruby_concealer_so
# This function takes the name of the file to be decrypted from stdin.
# There's some weirdness with a couple (pre|post)-receive-hooks in earlier GHE
# versions; these seem to like it a little better if one `cd`s to the directory
# first, using bundler if necessary.
# They still squawk a bit but seem to decrypt fine. We're avoiding a
# temporary file by setting a variable containing the decrypted contents;
# /bin/echo is necessary to avoid interpolating escaped newlines, etc.
ruby_revealer(){
f=$(cat); cd $(dirname $f)
# Save the original.
cp -p $f $f.bak
# Output our replacement.
r=$(ruby $(basename $f) 2>/dev/null ||
bundle exec 'ruby $(basename $f) 2>/dev/null' 2>/dev/null)
r=$(/bin/echo "$r" | head -n -2)
# If it has failed, move the original back.
# (A few do, due to bugs *in the code* itself, I believe.)
[ $(/bin/echo "$r" | wc -c) -lt 2 ] && (rm -f $f && mv $f.bak $f) ||
(/bin/echo "$r" > $f && touch -r $f.bak $f && rm -f $f.bak)
}
# Presto change-o.
voila(){
echo "One moment..." >&2 # While we grep through a bunch of other files...
for c in $(grep --include \*.rb -Rl __ruby_concealer__ /data 2>/dev/null); do
echo Revealing $c ... >&2; echo $c | ruby_revealer
done
}
# Put the module back how we found it; be sure to use a redirect to
# preserve permissions and modification dates, etc.
cleanup(){
cp -p $ruby_concealer_so.bak $ruby_concealer_so &&
rm -f $ruby_concealer_so.bak
}
# Make absolutely sure we put the .so back properly so we're not foobar'd.
trap cleanup INT
voila
cleanup

ytrezq commented Jun 22, 2016 edited

Hello, I’m very interested by the database schema, however, it seems/data/github/current/db/schema.rbis too large for your script.
May you fix this please ?

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