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Versions: 4
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Contents
# frozen_string_literal: true
require "digest/md5"
# Authenticator for the "+CRAM-MD5+" SASL mechanism, specified in
# RFC2195[https://tools.ietf.org/html/rfc2195]. See Net::IMAP#authenticate.
#
# == Deprecated
#
# +CRAM-MD5+ is obsolete and insecure. It is included for compatibility with
# existing servers.
# {draft-ietf-sasl-crammd5-to-historic}[https://tools.ietf.org/html/draft-ietf-sasl-crammd5-to-historic-00.html]
# recommends using +SCRAM-*+ or +PLAIN+ protected by TLS instead.
#
# Additionally, RFC8314[https://tools.ietf.org/html/rfc8314] discourage the use
# of cleartext and recommends TLS version 1.2 or greater be used for all
# traffic. With TLS +CRAM-MD5+ is okay, but so is +PLAIN+
class Net::IMAP::CramMD5Authenticator
def process(challenge)
digest = hmac_md5(challenge, @password)
return @user + " " + digest
end
private
def initialize(user, password)
@user = user
@password = password
end
def hmac_md5(text, key)
if key.length > 64
key = Digest::MD5.digest(key)
end
k_ipad = key + "\0" * (64 - key.length)
k_opad = key + "\0" * (64 - key.length)
for i in 0..63
k_ipad[i] = (k_ipad[i].ord ^ 0x36).chr
k_opad[i] = (k_opad[i].ord ^ 0x5c).chr
end
digest = Digest::MD5.digest(k_ipad + text)
return Digest::MD5.hexdigest(k_opad + digest)
end
Net::IMAP.add_authenticator "CRAM-MD5", self
end
Version data entries
4 entries across 4 versions & 2 rubygems