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|
# Check a user's access to perform a git action. All public methods in this
# class return an instance of `GitlabAccessStatus`
module Gitlab
class GitAccess
UnauthorizedError = Class.new(StandardError)
ERROR_MESSAGES = {
upload: 'You are not allowed to upload code for this project.',
download: 'You are not allowed to download code from this project.',
deploy_key_upload:
'This deploy key does not have write access to this project.',
no_repo: 'A repository for this project does not exist yet.'
}.freeze
DOWNLOAD_COMMANDS = %w{ git-upload-pack git-upload-archive }.freeze
PUSH_COMMANDS = %w{ git-receive-pack }.freeze
ALL_COMMANDS = DOWNLOAD_COMMANDS + PUSH_COMMANDS
attr_reader :actor, :project, :protocol, :user_access, :authentication_abilities
def initialize(actor, project, protocol, authentication_abilities:, env: {})
@actor = actor
@project = project
@protocol = protocol
@authentication_abilities = authentication_abilities
@user_access = UserAccess.new(user, project: project)
@env = env
end
def check(cmd, changes)
check_protocol!
check_active_user!
check_project_accessibility!
check_command_existence!(cmd)
check_repository_existence!
case cmd
when *DOWNLOAD_COMMANDS
check_download_access!
when *PUSH_COMMANDS
check_push_access!(changes)
end
build_status_object(true)
rescue UnauthorizedError => ex
build_status_object(false, ex.message)
end
def guest_can_download_code?
Guest.can?(:download_code, project)
end
def user_can_download_code?
authentication_abilities.include?(:download_code) && user_access.can_do_action?(:download_code)
end
def build_can_download_code?
authentication_abilities.include?(:build_download_code) && user_access.can_do_action?(:build_download_code)
end
def protocol_allowed?
Gitlab::ProtocolAccess.allowed?(protocol)
end
private
def check_protocol!
unless protocol_allowed?
raise UnauthorizedError, "Git access over #{protocol.upcase} is not allowed"
end
end
def check_active_user!
return if deploy_key?
if user && !user_access.allowed?
raise UnauthorizedError, "Your account has been blocked."
end
end
def check_project_accessibility!
if project.blank? || !can_read_project?
raise UnauthorizedError, 'The project you were looking for could not be found.'
end
end
def check_command_existence!(cmd)
unless ALL_COMMANDS.include?(cmd)
raise UnauthorizedError, "The command you're trying to execute is not allowed."
end
end
def check_repository_existence!
unless project.repository.exists?
raise UnauthorizedError, ERROR_MESSAGES[:no_repo]
end
end
def check_download_access!
return if deploy_key?
passed = user_can_download_code? ||
build_can_download_code? ||
guest_can_download_code?
unless passed
raise UnauthorizedError, ERROR_MESSAGES[:download]
end
end
def check_push_access!(changes)
if deploy_key
check_deploy_key_push_access!
elsif user
check_user_push_access!
else
raise UnauthorizedError, ERROR_MESSAGES[:upload]
end
return if changes.blank? # Allow access.
check_change_access!(changes)
end
def check_user_push_access!
unless authentication_abilities.include?(:push_code)
raise UnauthorizedError, ERROR_MESSAGES[:upload]
end
end
def check_deploy_key_push_access!
unless deploy_key.can_push_to?(project)
raise UnauthorizedError, ERROR_MESSAGES[:deploy_key_upload]
end
end
def check_change_access!(changes)
changes_list = Gitlab::ChangesList.new(changes)
# Iterate over all changes to find if user allowed all of them to be applied
changes_list.each do |change|
status = check_single_change_access(change)
unless status.allowed?
# If user does not have access to make at least one change - cancel all push
raise UnauthorizedError, status.message
end
end
end
def check_single_change_access(change)
Checks::ChangeAccess.new(
change,
user_access: user_access,
project: project,
env: @env,
skip_authorization: deploy_key?,
protocol: protocol
).exec
end
def matching_merge_request?(newrev, branch_name)
Checks::MatchingMergeRequest.new(newrev, branch_name, project).match?
end
def deploy_key
actor if deploy_key?
end
def deploy_key?
actor.is_a?(DeployKey)
end
def can_read_project?
if deploy_key
deploy_key.has_access_to?(project)
elsif user
user.can?(:read_project, project)
end || Guest.can?(:read_project, project)
end
protected
def user
return @user if defined?(@user)
@user =
case actor
when User
actor
when DeployKey
nil
when Key
actor.user
end
end
def build_status_object(status, message = '')
Gitlab::GitAccessStatus.new(status, message)
end
end
end
|
