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#!/bin/bash
# Check an IP before allowing access.
# This is also a generic example of how to add arbitrary checks at the PRE_GIT
# stage, in order to control fetch/clone as well, not just push operations
# (VREFs, in contrast, only work for pushes).
# Notice how repo-specific information is being passed to this code (bullet 3
# below). For more on that, see:
# https://gitolite.com/gitolite/dev-notes#appendix-1-repo-specific-environment-variables
# Instructions:
# 1. put this in an appropriate triggers directory (read about non-core
# code at http://gitolite.com/gitolite/non-core for more on this; the
# cookbook may also help here).
# 2. add a line:
# PRE_GIT => [ 'IP-check' ],
# just before the "ENABLE" line in the rc file
# 3. add a line like this to the "repo ..." section in gitolite.conf:
# option ENV.IP_allowed = 1.2.3.0/24
# take care that this expression is valid, in the sense that passing it
# to 'ipcalc -n' will return the part before the "/". I.e., in this
# example, 'ipcalc -n 1.2.3.0/24' should (and does) return 1.2.3.0.
# ----
[ -n "$GL_OPTION_IP_allowed" ] || exit 0
expected=${GL_OPTION_IP_allowed%/*}
mask=${GL_OPTION_IP_allowed#*/}
current_ip=${SSH_CONNECTION%% *}
eval `ipcalc -n $current_ip/$mask`
[ "$expected" == "$NETWORK" ] && exit 0
echo >&2 "IP $current_ip does not match allowed block $GL_OPTION_IP_allowed"
exit 1
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