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require 'shellwords'
require_relative 'gitlab_net'
class GitlabShell
class DisallowedCommandError < StandardError; end
attr_accessor :key_id, :repo_name, :git_cmd, :repos_path, :repo_name
def initialize
@key_id = /key-[0-9]+/.match(ARGV.join).to_s
@origin_cmd = ENV['SSH_ORIGINAL_COMMAND']
@config = GitlabConfig.new
@repos_path = @config.repos_path
end
def exec
if @origin_cmd
parse_cmd
if git_cmds.include?(@git_cmd)
ENV['GL_ID'] = @key_id
if validate_access
process_cmd
else
message = "gitlab-shell: Access denied for git command <#{@origin_cmd}> by #{log_username}."
$logger.warn message
$stderr.puts "Access denied."
end
else
raise DisallowedCommandError
end
else
puts "Welcome to GitLab, #{username}!"
end
rescue DisallowedCommandError => ex
message = "gitlab-shell: Attempt to execute disallowed command <#{@origin_cmd}> by #{log_username}."
$logger.warn message
puts 'Not allowed command'
end
protected
def parse_cmd
args = Shellwords.shellwords(@origin_cmd)
raise DisallowedCommandError unless args.count == 2
@git_cmd = args[0]
@repo_name = escape_path(args[1])
end
def git_cmds
%w(git-upload-pack git-receive-pack git-upload-archive)
end
def process_cmd
repo_full_path = File.join(repos_path, repo_name)
$logger.info "gitlab-shell: executing git command <#{@git_cmd} #{repo_full_path}> for #{log_username}."
exec_cmd(@git_cmd, repo_full_path)
end
def validate_access
api.check_access(@git_cmd, @repo_name, @key_id, '_any').allowed?
end
# This method is not covered by Rspec because it ends the current Ruby process.
def exec_cmd(*args)
Kernel::exec({'PATH' => ENV['PATH'], 'LD_LIBRARY_PATH' => ENV['LD_LIBRARY_PATH'], 'GL_ID' => ENV['GL_ID']}, *args, unsetenv_others: true)
end
def api
GitlabNet.new
end
def user
# Can't use "@user ||=" because that will keep hitting the API when @user is really nil!
if instance_variable_defined?('@user')
@user
else
@user = api.discover(@key_id)
end
end
def username
user && user['name'] || 'Anonymous'
end
# User identifier to be used in log messages.
def log_username
@config.audit_usernames ? username : "user with key #{@key_id}"
end
def escape_path(path)
full_repo_path = File.join(repos_path, path)
if File.absolute_path(full_repo_path) == full_repo_path
path
else
abort "Wrong repository path"
end
end
end
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