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require 'open3'
require 'shellwords'
require_relative 'gitlab_net'
class GitlabShell
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
@user_tried = false
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
message = "gitlab-shell: Attempt to execute disallowed command <#{@origin_cmd}> by #{log_username}."
$logger.warn message
puts 'Not allowed command'
end
else
puts "Welcome to GitLab, #{username}!"
end
end
protected
def parse_cmd
args = Shellwords.shellwords(@origin_cmd)
@git_cmd = args[0]
@repo_name = 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.allowed?(@git_cmd, @repo_name, @key_id, '_any')
end
def exec_cmd *args
Kernel::exec *args
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 @user_tried
@user
else
@user_tried = true
@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
end
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