Meteor Authenticate email/password from a different server with bcrypt - ruby

Question

I want to let my meteor users login through a ruby app.
Where I am
I have two websites, both on the same domain, both share the same MongoDB.
One is a METEOR-app with accounts-password (which uses bcrypt)
The other is a RUBY ON RAILS-app which uses devise (which also uses bcrypt) for authentication.
On both apps I can register and login, separately.
When I transfer (copy/paste) the encrypted_password from Meteor's "bcrypt" field to Ruby's "encrypted_password" and try to login I get rejected. It does not work vice versa. Then I recreated the kind of salting by the meteor app in my ruby app (SHA-256 plain-password-hashing before they got compared against).
(here is the meteor accounts-password source file (https://github.com/meteor/meteor/blob/oplog-backlog-on-1.0.3.1/packages/accounts-password/password_server.js ))
and this is my Ruby implementation:
class BCryptSHA256Hasher < Hasher
def initialize
#algorithm = :bcrypt_sha256
#cost = 10
#digest = OpenSSL::Digest::SHA256.new
end
def salt
BCrypt::Engine.generate_salt(#cost)
end
def get_password_string(password)
#digest.digest(password) unless #digest.nil?
end
def encode(password, salt)
password = get_password_string(password)
hash = BCrypt::Engine.hash_secret(password, salt)
return hash
end
def verify(password, encoded)
password_digest = get_password_string(password)
hash = BCrypt::Engine.hash_secret(password_digest, encoded)
# password = "asdfasdf"
# encoded = "$2a$10$FqvtI7zNgmdWJJG1n9JwZewVYrzEn38JIxEGwmMviMsZsrCmYHqWm"
# hash = "$2a$10$FqvtI7zNgmdWJJG1n9JwZe22XU1hRDSNtHIrnYve9FbmjjqJCLhZi"
# constant_time_comparison:
constant_time_compare(encoded, hash)
end
def constant_time_compare(a, b)
check = a.bytesize ^ b.bytesize
a.bytes.zip(b.bytes) { |x, y| check |= x ^ y }
check == 0
end
end
Here is a valid User-document, which will be used by both servers:
{
"_id": "g4BPfpavJGGTNgJcE",
"authentication_token": "iZqmCsYS1Y9Xxh6t22-X",
"confirmed_at": new Date(1457963598783),
"createdAt": new Date(1457963456581),
"current_sign_in_at": new Date(1457966356123),
"current_sign_in_ip": "127.0.0.1",
"email": "demo#demo.com",
"emails": [
{
"address": "demo#demo.com",
"verified": true
}
],
"encrypted_password": "$2a$10$7/PJw51HgXfzYJWpaBHGj.QoRCTl0E29X0ZYTZPQhLRo69DGi8Xou",
"failed_attempts": 0,
"last_sign_in_at": new Date(1457966356123),
"last_sign_in_ip": "127.0.0.1",
"profile": {
"_id": ObjectId("56e6c1e7a54d7595e099da27"),
"firstName": "asdf",
"lastName": "asdf"
},
"reset_password_sent_at": null,
"reset_password_token": null,
"services": {
"_id": ObjectId("56e6c1e7a54d7595e099da28"),
"password": {
"bcrypt": "$2a$10$7/PJw51HgXfzYJWpaBHGj.QoRCTl0E29X0ZYTZPQhLRo69DGi8Xou"
},
"resume": {
"loginTokens": [
]
}
},
"sign_in_count": 1,
"updated_at": new Date(1457966356127),
"username": "mediatainment"
}

Answer 1

I think #maxpleaner's comment is the best way to handle authentication. But if really need to authenticate users separately, then just monkey patch devise.
config/initializers/devise_meteor_adapter.rb
module DeviseMeteorAdapter
def digest(klass, password)
klass.pepper = nil
password = ::Digest::SHA256.hexdigest(password)
super
end
def compare(klass, hashed_password, password)
klass.pepper = nil
password = ::Digest::SHA256.hexdigest(password)
super
end
end
Devise::Encryptor.singleton_class.prepend(DeviseMeteorAdapter)
WARNING: Not tested.