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|
require 'shellwords'
require_relative 'gitlab_net'
class GitlabShell
class AccessDeniedError < StandardError; end
class DisallowedCommandError < StandardError; end
class InvalidRepositoryPathError < StandardError; end
GIT_COMMANDS = %w(git-upload-pack git-receive-pack git-upload-archive git-annex-shell git-lfs-authenticate).freeze
attr_accessor :key_id, :repo_name, :git_cmd, :repos_path, :repo_name
def initialize(key_id, origin_cmd)
@key_id = key_id
@origin_cmd = origin_cmd
@config = GitlabConfig.new
@repos_path = @config.repos_path
end
def exec
unless @origin_cmd
puts "Welcome to GitLab, #{username}!"
return true
end
parse_cmd
verify_access
process_cmd
true
rescue GitlabNet::ApiUnreachableError => ex
$stderr.puts "GitLab: Failed to authorize your Git request: internal API unreachable"
false
rescue AccessDeniedError => ex
message = "gitlab-shell: Access denied for git command <#{@origin_cmd}> by #{log_username}."
$logger.warn message
$stderr.puts "GitLab: #{ex.message}"
false
rescue DisallowedCommandError => ex
message = "gitlab-shell: Attempt to execute disallowed command <#{@origin_cmd}> by #{log_username}."
$logger.warn message
$stderr.puts "GitLab: Disallowed command"
false
rescue InvalidRepositoryPathError => ex
$stderr.puts "GitLab: Invalid repository path"
false
end
protected
def parse_cmd
args = Shellwords.shellwords(@origin_cmd)
@git_cmd = args.first
@git_access = @git_cmd
raise DisallowedCommandError unless GIT_COMMANDS.include?(@git_cmd)
case @git_cmd
when 'git-annex-shell'
raise DisallowedCommandError unless @config.git_annex_enabled?
@repo_name = escape_path(args[2].sub(/\A\/~\//, ''))
# Make sure repository has git-annex enabled
init_git_annex(@repo_name)
when 'git-lfs-authenticate'
raise DisallowedCommandError unless args.count >= 2
@repo_name = escape_path(args[1])
case args[2]
when 'download'
@git_access = 'git-upload-pack'
when 'upload'
@git_access = 'git-receive-pack'
else
raise DisallowedCommandError
end
else
raise DisallowedCommandError unless args.count == 2
@repo_name = escape_path(args.last)
end
end
def verify_access
status = api.check_access(@git_access, @repo_name, @key_id, '_any')
raise AccessDeniedError, status.message unless status.allowed?
end
def process_cmd
repo_full_path = File.join(repos_path, repo_name)
if @git_cmd == 'git-annex-shell'
raise DisallowedCommandError unless @config.git_annex_enabled?
args = Shellwords.shellwords(@origin_cmd)
parsed_args =
args.map do |arg|
# Convert /~/group/project.git to group/project.git
# to make git annex path compatible with gitlab-shell
if arg =~ /\A\/~\/.*\.git\Z/
repo_full_path
else
arg
end
end
$logger.info "gitlab-shell: executing git-annex command <#{parsed_args.join(' ')}> for #{log_username}."
exec_cmd(*parsed_args)
else
$logger.info "gitlab-shell: executing git command <#{@git_cmd} #{repo_full_path}> for #{log_username}."
exec_cmd(@git_cmd, repo_full_path)
end
end
# This method is not covered by Rspec because it ends the current Ruby process.
def exec_cmd(*args)
env = {
'PATH' => ENV['PATH'],
'LD_LIBRARY_PATH' => ENV['LD_LIBRARY_PATH'],
'GL_ID' => @key_id
}
if @config.git_annex_enabled?
env.merge!({ 'GIT_ANNEX_SHELL_LIMITED' => '1' })
end
Kernel::exec(env, *args, unsetenv_others: true)
end
def api
GitlabNet.new
end
def user
return @user if defined?(@user)
begin
@user = api.discover(@key_id)
rescue GitlabNet::ApiUnreachableError
@user = nil
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
raise InvalidRepositoryPathError
end
end
def init_git_annex(path)
full_repo_path = File.join(repos_path, path)
unless File.exists?(File.join(full_repo_path, 'annex'))
cmd = %W(git --git-dir=#{full_repo_path} annex init "GitLab")
system(*cmd, err: '/dev/null', out: '/dev/null')
$logger.info "Enable git-annex for repository: #{path}."
end
end
end
|
