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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 :params, :project, :git_cmd, :user
def allowed?(actor, cmd, project, changes = nil)
case cmd
when *DOWNLOAD_COMMANDS
if actor.is_a? User
download_allowed?(actor, project)
elsif actor.is_a? DeployKey
actor.projects.include?(project)
elsif actor.is_a? Key
download_allowed?(actor.user, project)
else
raise 'Wrong actor'
end
when *PUSH_COMMANDS
if actor.is_a? User
push_allowed?(actor, project, changes)
elsif actor.is_a? DeployKey
# Deploy key not allowed to push
return false
elsif actor.is_a? Key
push_allowed?(actor.user, project, changes)
else
raise 'Wrong actor'
end
else
false
end
end
def download_allowed?(user, project)
if user && user_allowed?(user)
user.can?(:download_code, project)
else
false
end
end
def push_allowed?(user, project, changes)
return false unless user && user_allowed?(user)
return true if changes.blank?
changes = changes.lines if changes.kind_of?(String)
# Iterate over all changes to find if user allowed all of them to be applied
changes.each do |change|
oldrev, newrev, ref = changes.split('')
action = if project.protected_branch?(ref)
# we dont allow force push to protected branch
if forced_push?(oldrev, newrev)
:force_push_code_to_protected_branches
# and we dont allow remove of protected branch
elsif newrev =~ /0000000/
:remove_protected_branches
else
:push_code_to_protected_branches
end
elsif project.repository && project.repository.tag_names.include?(ref)
# Prevent any changes to existing git tag unless user has permissions
:admin_project
else
:push_code
end
unless user.can?(action, project)
# If user does not have access to make at least one change - cancel all push
return false
end
end
# If user has access to make all changes
true
end
def forced_push?(oldrev, newrev)
return false if project.empty_repo?
if oldrev !~ /00000000/ && newrev !~ /00000000/
missed_refs = IO.popen(%W(git --git-dir=#{project.repository.path_to_repo} rev-list #{oldrev} ^#{newrev})).read
missed_refs.split("\n").size > 0
else
false
end
end
private
def user_allowed?(user)
Gitlab::UserAccess.allowed?(user)
end
end
end
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