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##
# The TrustDir manages the trusted certificates for gem signature
# verification.
class Gem::Security::TrustDir
##
# Default permissions for the trust directory and its contents
DEFAULT_PERMISSIONS = {
:trust_dir => 0700,
:trusted_cert => 0600,
}
##
# The directory where trusted certificates will be stored.
attr_reader :dir
##
# Creates a new TrustDir using +dir+ where the directory and file
# permissions will be checked according to +permissions+
def initialize dir, permissions = DEFAULT_PERMISSIONS
@dir = dir
@permissions = permissions
@digester = Gem::Security::DIGEST_ALGORITHM
end
##
# Returns the path to the trusted +certificate+
def cert_path certificate
name_path certificate.subject
end
##
# Enumerates trusted certificates.
def each_certificate
return enum_for __method__ unless block_given?
glob = File.join @dir, '*.pem'
Dir[glob].each do |certificate_file|
begin
certificate = load_certificate certificate_file
yield certificate, certificate_file
rescue OpenSSL::X509::CertificateError
next # HACK warn
end
end
end
##
# Returns the issuer certificate of the given +certificate+ if it exists in
# the trust directory.
def issuer_of certificate
path = name_path certificate.issuer
return unless File.exist? path
load_certificate path
end
##
# Returns the path to the trusted certificate with the given ASN.1 +name+
def name_path name
digest = @digester.hexdigest name.to_s
File.join @dir, "cert-#{digest}.pem"
end
##
# Loads the given +certificate_file+
def load_certificate certificate_file
pem = File.read certificate_file
OpenSSL::X509::Certificate.new pem
end
##
# Add a certificate to trusted certificate list.
def trust_cert certificate
verify
destination = cert_path certificate
open destination, 'wb', @permissions[:trusted_cert] do |io|
io.write certificate.to_pem
end
end
##
# Make sure the trust directory exists. If it does exist, make sure it's
# actually a directory. If not, then create it with the appropriate
# permissions.
def verify
if File.exist? @dir then
raise Gem::Security::Exception,
"trust directory #{@dir} is not a directory" unless
File.directory? @dir
FileUtils.chmod 0700, @dir
else
FileUtils.mkdir_p @dir, :mode => @permissions[:trust_dir]
end
end
end