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#!/usr/bin/env fish
# load environment
source (status dirname)/env
# global variables
set gitCommand
set repoDir
set currentUser (whoami)
function log --on-event log_event
echo "$(date -Is): $argv[1..2] user=$currentUser $argv[3..] ip=$SSH_CONNECTION" >> $_LOG
end
function verifyGitCommand
# check given git command
# basic form is <git-command> '<path-to-repo>'
if test (count $argv) -ne 2
emit log_event DENY bad_format "argv=$argv"
return 1
end
end
function verifyRepoJail
set -l realPath (realpath $repoDir)
if not string match -r -q -- "/srv/repos/.*" "$realPath"
emit log_event DENY jail_escape "realPath=$realPath"
return 2
end
end
function verifyPermissions
set -l permission
switch "$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
emit log_event DENY unkown_git_command "gitCommand=$gitCommand"
return 3
end
# check for permissions
if not cat $_REPO_PERMISSIONS_FILE | grep -q -E "^$repoDir:$currentUser:$permission\$"
emit log_event DENY no_permissions
return 4
end
end
# redirect stdout/stderr to file, no information to potential attacker
begin
# parse command
set -l parsedCommand (string match -r -g $_GIT_VALIDATION_REGEX -- "$argv")
verifyGitCommand $parsedCommand; or exit $status
# extract variables
set gitCommand $parsedCommand[1]
# adjust repo path to /srv/repos
set repoDir /(string join -n '/' srv repos (string split '/' $parsedCommand[2]))
# check if realPath is in jail under /srv/repos
verifyRepoJail; or exit $status
# check for permissions needed
verifyPermissions; or exit $status
# info logging
emit log_event ALLOW ok "argv=$argv"
end &>>$_LOG
# execute parsed git command
exec /usr/bin/sudo -n -u git /usr/bin/git-shell -c "$gitCommand '$repoDir'"
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