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|
# frozen_string_literal: true
require 'openssl'
require 'digest'
module Gitlab
module X509
class Commit < Gitlab::SignedCommit
def signature
super
return @signature if @signature
cached_signature = lazy_signature&.itself
return @signature = cached_signature if cached_signature.present?
@signature = create_cached_signature!
end
def update_signature!(cached_signature)
cached_signature.update!(attributes)
@signature = cached_signature
end
private
def lazy_signature
BatchLoader.for(@commit.sha).batch do |shas, loader|
X509CommitSignature.by_commit_sha(shas).each do |signature|
loader.call(signature.commit_sha, signature)
end
end
end
def verified_signature
strong_memoize(:verified_signature) { verified_signature? }
end
def cert
strong_memoize(:cert) do
signer_certificate(p7) if valid_signature?
end
end
def cert_store
strong_memoize(:cert_store) do
store = OpenSSL::X509::Store.new
store.set_default_paths
# valid_signing_time? checks the time attributes already
# this flag is required, otherwise expired certificates would become
# unverified when notAfter within certificate attribute is reached
store.flags = OpenSSL::X509::V_FLAG_NO_CHECK_TIME
store
end
end
def p7
strong_memoize(:p7) do
pkcs7_text = signature_text.sub('-----BEGIN SIGNED MESSAGE-----', '-----BEGIN PKCS7-----')
pkcs7_text = pkcs7_text.sub('-----END SIGNED MESSAGE-----', '-----END PKCS7-----')
OpenSSL::PKCS7.new(pkcs7_text)
rescue
nil
end
end
def valid_signing_time?
# rfc 5280 - 4.1.2.5 Validity
# check if signed_time is within the time range (notBefore/notAfter)
# non-rfc - git specific check: signed_time >= commit_time
p7.signers[0].signed_time.between?(cert.not_before, cert.not_after) &&
p7.signers[0].signed_time >= @commit.created_at
end
def valid_signature?
p7.verify([], cert_store, signed_text, OpenSSL::PKCS7::NOVERIFY)
rescue
nil
end
def verified_signature?
# verify has multiple options but only a boolean return value
# so first verify without certificate chain
if valid_signature?
if valid_signing_time?
# verify with system certificate chain
p7.verify([], cert_store, signed_text)
else
false
end
else
nil
end
rescue
nil
end
def signer_certificate(p7)
p7.certificates.each do |cert|
next if cert.serial != p7.signers[0].serial
return cert
end
end
def certificate_crl
extension = get_certificate_extension('crlDistributionPoints')
crl_url = nil
extension.each_line do |line|
break if crl_url
line.split('URI:').each do |item|
item.strip
if item.start_with?("http")
crl_url = item.strip
break
end
end
end
crl_url
end
def get_certificate_extension(extension)
cert.extensions.each do |ext|
if ext.oid == extension
return ext.value
end
end
end
def issuer_subject_key_identifier
get_certificate_extension('authorityKeyIdentifier').gsub("keyid:", "").delete!("\n")
end
def certificate_subject_key_identifier
get_certificate_extension('subjectKeyIdentifier')
end
def certificate_issuer
cert.issuer.to_s(OpenSSL::X509::Name::RFC2253)
end
def certificate_subject
cert.subject.to_s(OpenSSL::X509::Name::RFC2253)
end
def certificate_email
get_certificate_extension('subjectAltName').split('email:')[1]
end
def issuer_attributes
return if verified_signature.nil?
{
subject_key_identifier: issuer_subject_key_identifier,
subject: certificate_issuer,
crl_url: certificate_crl
}
end
def certificate_attributes
return if verified_signature.nil?
issuer = X509Issuer.safe_create!(issuer_attributes)
{
subject_key_identifier: certificate_subject_key_identifier,
subject: certificate_subject,
email: certificate_email,
serial_number: cert.serial,
x509_issuer_id: issuer.id
}
end
def attributes
return if verified_signature.nil?
certificate = X509Certificate.safe_create!(certificate_attributes)
{
commit_sha: @commit.sha,
project: @commit.project,
x509_certificate_id: certificate.id,
verification_status: verification_status(certificate)
}
end
def verification_status(certificate)
return :unverified if certificate.revoked?
if verified_signature && certificate_email == @commit.committer_email
:verified
else
:unverified
end
end
def create_cached_signature!
return if verified_signature.nil?
return X509CommitSignature.new(attributes) if Gitlab::Database.read_only?
X509CommitSignature.safe_create!(attributes)
end
end
end
end
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