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#!/usr/bin/env fish
# load environment
source (dirname (status --current-filename))/env
set -l gitCommand
set -l repoDir
# redirect stdout/stderr to file, no information to potential attacker
begin
# check given git command
# basic form is <git-command> '<path-to-repo>'
set -l currentUser (whoami)
set -l matcher (string match -r -g $_GIT_VALIDATION_REGEX -- "$argv")
if test (count $matcher) -ne 2
echo "$(date -Is): DENY bad_format user=$currentUser ip=$SSH_CONNECTION argv=$argv"
exit 1
end
# extract variables from git command
set gitCommand $matcher[1]
set -l repo $matcher[2]
# check for permissions needed
set -l permission
switch "$gitCommand"
case "git-upload-pack"
# allow clone/fetch/pull
set permission [rw]
case "git-upload-archive"
# allow remote archive
set permission [rw]
case "git-receive-pack"
# only allow for write users
set permission [w]
case '*'
# this should not happend because we sanitize above the git command
echo "$(date -Is): DENY unkown_git_command user=$currentUser ip=$SSH_CONNECTION realPath=$realPath argv=$argv"
exit 2
end
# adjust repo path to /srv/repos
set repoDir /(string join -n '/' srv repos (string split '/' $repo))
# check if realPath is in jail under /srv/repos
set -l realPath (realpath $repoDir)
if not string match -r -q -- "/srv/repos/.*" "$realPath"
echo "$(date -Is): DENY jail_escape user=$currentUser ip=$SSH_CONNECTION realPath=$realPath argv=$argv"
exit 3
end
# check for permissions
if not cat $_REPO_PERMISSIONS_FILE | grep -q -E "^$repoDir:$currentUser:$permission\$"
echo "$(date -Is): DENY no_permissions user=$currentUser ip=$SSH_CONNECTION argv=$argv"
exit 4
end
# info logging
echo "$(date -Is): ALLOW ok user=$currentUser ip=$SSH_CONNECTION argv=$argv"
end &>>$_LOG
# execute parsed git command
/usr/bin/sudo -u git /usr/bin/git-shell -c "$gitCommand '$repoDir'"
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