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module Gitlab
class GitAccess
DOWNLOAD_COMMANDS = %w{ git-upload-pack git-upload-archive }
PUSH_COMMANDS = %w{ git-receive-pack }
attr_reader :actor, :project
def initialize(actor, project)
@actor = actor
@project = project
end
def user
return @user if defined?(@user)
@user =
case actor
when User
actor
when DeployKey
nil
when Key
actor.user
end
end
def deploy_key
actor if actor.is_a?(DeployKey)
end
def can_push_to_branch?(ref)
return false unless user
if project.protected_branch?(ref) && !project.developers_can_push_to_protected_branch?(ref)
user.can?(:push_code_to_protected_branches, project)
else
user.can?(:push_code, project)
end
end
def can_read_project?
if user
user.can?(:read_project, project)
elsif deploy_key
deploy_key.projects.include?(project)
else
false
end
end
def check(cmd, changes = nil)
unless actor
return build_status_object(false, "No user or key was provided.")
end
if user && !user_allowed?
return build_status_object(false, "Your account has been blocked.")
end
unless project && can_read_project?
return build_status_object(false, 'The project you were looking for could not be found.')
end
case cmd
when *DOWNLOAD_COMMANDS
download_access_check
when *PUSH_COMMANDS
push_access_check(changes)
else
build_status_object(false, "The command you're trying to execute is not allowed.")
end
end
def download_access_check
if user
user_download_access_check
elsif deploy_key
build_status_object(true)
else
raise 'Wrong actor'
end
end
def push_access_check(changes)
if user
user_push_access_check(changes)
elsif deploy_key
build_status_object(false, "Deploy keys are not allowed to push code.")
else
raise 'Wrong actor'
end
end
def user_download_access_check
unless user.can?(:download_code, project)
return build_status_object(false, "You are not allowed to download code from this project.")
end
build_status_object(true)
end
def user_push_access_check(changes)
if changes.blank?
return build_status_object(true)
end
unless project.repository.exists?
return build_status_object(false, "A repository for this project does not exist yet.")
end
changes = changes.lines if changes.kind_of?(String)
# Iterate over all changes to find if user allowed all of them to be applied
changes.map(&:strip).reject(&:blank?).each do |change|
status = change_access_check(change)
unless status.allowed?
# If user does not have access to make at least one change - cancel all push
return status
end
end
build_status_object(true)
end
def change_access_check(change)
oldrev, newrev, ref = change.split(' ')
action =
if project.protected_branch?(branch_name(ref))
protected_branch_action(oldrev, newrev, branch_name(ref))
elsif protected_tag?(tag_name(ref))
# Prevent any changes to existing git tag unless user has permissions
:admin_project
else
:push_code
end
unless user.can?(action, project)
status =
case action
when :force_push_code_to_protected_branches
build_status_object(false, "You are not allowed to force push code to a protected branch on this project.")
when :remove_protected_branches
build_status_object(false, "You are not allowed to deleted protected branches from this project.")
when :push_code_to_protected_branches
build_status_object(false, "You are not allowed to push code to protected branches on this project.")
when :admin_project
build_status_object(false, "You are not allowed to change existing tags on this project.")
else # :push_code
build_status_object(false, "You are not allowed to push code to this project.")
end
return status
end
build_status_object(true)
end
def forced_push?(oldrev, newrev)
Gitlab::ForcePushCheck.force_push?(project, oldrev, newrev)
end
private
def protected_branch_action(oldrev, newrev, branch_name)
# we dont allow force push to protected branch
if forced_push?(oldrev, newrev)
:force_push_code_to_protected_branches
elsif Gitlab::Git.blank_ref?(newrev)
# and we dont allow remove of protected branch
:remove_protected_branches
elsif project.developers_can_push_to_protected_branch?(branch_name)
:push_code
else
:push_code_to_protected_branches
end
end
def protected_tag?(tag_name)
project.repository.tag_names.include?(tag_name)
end
def user_allowed?
Gitlab::UserAccess.allowed?(user)
end
def branch_name(ref)
ref = ref.to_s
if Gitlab::Git.branch_ref?(ref)
Gitlab::Git.ref_name(ref)
else
nil
end
end
def tag_name(ref)
ref = ref.to_s
if Gitlab::Git.tag_ref?(ref)
Gitlab::Git.ref_name(ref)
else
nil
end
end
protected
def build_status_object(status, message = '')
GitAccessStatus.new(status, message)
end
end
end
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