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require 'base64'
require 'json'
require 'securerandom'
require 'uri'
module Gitlab
class Workhorse
SEND_DATA_HEADER = 'Gitlab-Workhorse-Send-Data'.freeze
VERSION_FILE = 'GITLAB_WORKHORSE_VERSION'.freeze
INTERNAL_API_CONTENT_TYPE = 'application/vnd.gitlab-workhorse+json'.freeze
INTERNAL_API_REQUEST_HEADER = 'Gitlab-Workhorse-Api-Request'.freeze
NOTIFICATION_CHANNEL = 'workhorse:notifications'.freeze
ALLOWED_GIT_HTTP_ACTIONS = %w[git_receive_pack git_upload_pack info_refs].freeze
# Supposedly the effective key size for HMAC-SHA256 is 256 bits, i.e. 32
# bytes https://tools.ietf.org/html/rfc4868#section-2.6
SECRET_LENGTH = 32
class << self
def git_http_ok(repository, is_wiki, user, action, show_all_refs: false)
raise "Unsupported action: #{action}" unless ALLOWED_GIT_HTTP_ACTIONS.include?(action.to_s)
project = repository.project
{
GL_ID: Gitlab::GlId.gl_id(user),
GL_REPOSITORY: Gitlab::GlRepository.gl_repository(project, is_wiki),
GL_USERNAME: user&.username,
ShowAllRefs: show_all_refs,
Repository: repository.gitaly_repository.to_h,
RepoPath: 'ignored but not allowed to be empty in gitlab-workhorse',
GitalyServer: {
address: Gitlab::GitalyClient.address(project.repository_storage),
token: Gitlab::GitalyClient.token(project.repository_storage)
}
}
end
def send_git_blob(repository, blob)
params = {
'GitalyServer' => gitaly_server_hash(repository),
'GetBlobRequest' => {
repository: repository.gitaly_repository.to_h,
oid: blob.id,
limit: -1
}
}
[
SEND_DATA_HEADER,
"git-blob:#{encode(params)}"
]
end
def send_git_archive(repository, ref:, format:, append_sha:)
format ||= 'tar.gz'
format.downcase!
params = repository.archive_metadata(ref, Gitlab.config.gitlab.repository_downloads_path, format, append_sha: append_sha)
raise "Repository or ref not found" if params.empty?
params['GitalyServer'] = gitaly_server_hash(repository)
# If present DisableCache must be a Boolean. Otherwise workhorse ignores it.
params['DisableCache'] = true if git_archive_cache_disabled?
[
SEND_DATA_HEADER,
"git-archive:#{encode(params)}"
]
end
def send_git_snapshot(repository)
params = {
'GitalyServer' => gitaly_server_hash(repository),
'GetSnapshotRequest' => Gitaly::GetSnapshotRequest.new(
repository: repository.gitaly_repository
).to_json
}
[
SEND_DATA_HEADER,
"git-snapshot:#{encode(params)}"
]
end
def send_git_diff(repository, diff_refs)
params = {
'GitalyServer' => gitaly_server_hash(repository),
'RawDiffRequest' => Gitaly::RawDiffRequest.new(
gitaly_diff_or_patch_hash(repository, diff_refs)
).to_json
}
[
SEND_DATA_HEADER,
"git-diff:#{encode(params)}"
]
end
def send_git_patch(repository, diff_refs)
params = if Gitlab::GitalyClient.feature_enabled?(:workhorse_send_git_patch, status: Gitlab::GitalyClient::MigrationStatus::OPT_OUT)
{
'GitalyServer' => gitaly_server_hash(repository),
'RawPatchRequest' => Gitaly::RawPatchRequest.new(
gitaly_diff_or_patch_hash(repository, diff_refs)
).to_json
}
else
workhorse_diff_or_patch_hash(repository, diff_refs)
end
[
SEND_DATA_HEADER,
"git-format-patch:#{encode(params)}"
]
end
def send_artifacts_entry(build, entry)
file = build.artifacts_file
archive = file.file_storage? ? file.path : file.url
params = {
'Archive' => archive,
'Entry' => Base64.encode64(entry.to_s)
}
[
SEND_DATA_HEADER,
"artifacts-entry:#{encode(params)}"
]
end
def send_url(url, allow_redirects: false)
params = {
'URL' => url,
'AllowRedirects' => allow_redirects
}
[
SEND_DATA_HEADER,
"send-url:#{encode(params)}"
]
end
def terminal_websocket(terminal)
details = {
'Terminal' => {
'Subprotocols' => terminal[:subprotocols],
'Url' => terminal[:url],
'Header' => terminal[:headers],
'MaxSessionTime' => terminal[:max_session_time]
}
}
details['Terminal']['CAPem'] = terminal[:ca_pem] if terminal.key?(:ca_pem)
details
end
def version
path = Rails.root.join(VERSION_FILE)
path.readable? ? path.read.chomp : 'unknown'
end
def secret
@secret ||= begin
bytes = Base64.strict_decode64(File.read(secret_path).chomp)
raise "#{secret_path} does not contain #{SECRET_LENGTH} bytes" if bytes.length != SECRET_LENGTH
bytes
end
end
def write_secret
bytes = SecureRandom.random_bytes(SECRET_LENGTH)
File.open(secret_path, 'w:BINARY', 0600) do |f|
f.chmod(0600) # If the file already existed, the '0600' passed to 'open' above was a no-op.
f.write(Base64.strict_encode64(bytes))
end
end
def verify_api_request!(request_headers)
decode_jwt(request_headers[INTERNAL_API_REQUEST_HEADER])
end
def decode_jwt(encoded_message)
JWT.decode(
encoded_message,
secret,
true,
{ iss: 'gitlab-workhorse', verify_iss: true, algorithm: 'HS256' }
)
end
def secret_path
Gitlab.config.workhorse.secret_file
end
def set_key_and_notify(key, value, expire: nil, overwrite: true)
Gitlab::Redis::Queues.with do |redis|
result = redis.set(key, value, ex: expire, nx: !overwrite)
if result
redis.publish(NOTIFICATION_CHANNEL, "#{key}=#{value}")
value
else
redis.get(key)
end
end
end
protected
def encode(hash)
Base64.urlsafe_encode64(JSON.dump(hash))
end
def gitaly_server_hash(repository)
{
address: Gitlab::GitalyClient.address(repository.project.repository_storage),
token: Gitlab::GitalyClient.token(repository.project.repository_storage)
}
end
def workhorse_diff_or_patch_hash(repository, diff_refs)
{
'RepoPath' => repository.path_to_repo,
'ShaFrom' => diff_refs.base_sha,
'ShaTo' => diff_refs.head_sha
}
end
def gitaly_diff_or_patch_hash(repository, diff_refs)
{
repository: repository.gitaly_repository,
left_commit_id: diff_refs.base_sha,
right_commit_id: diff_refs.head_sha
}
end
def git_archive_cache_disabled?
ENV['WORKHORSE_ARCHIVE_CACHE_DISABLED'].present? || Feature.enabled?(:workhorse_archive_cache_disabled)
end
end
end
end