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