README

== u2flib-server ==
Provides functionality for working with the server side aspects of the U2F
protocol as defined in the FIDO
specifications, available here: http://fidoalliance.org/specifications/download

=== License ===
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

=== Dependencies ===
u2flib-host depends on M2Crypto. On a Ubuntu system, this can be installed with
the following command: 

  $ apt-get install python-m2crypto

=== Installation ===
u2flib-host is installable by running the following command:

  $ python setup.py install

=== Example ===
See examples/u2f_server.py for a working example of a HTTP server for
U2F enrollment and authentication. u2f_server.py can be run as a stand-alone
server, and can be used to test a U2F client implementation, such as
python-u2flib-host, using for example cURL.

The examples below show cURL command to register a U2F device, and to
authenticate it.

==== Registration ====
Registration is initiated by sending a request to the server:

----
$ curl http://localhost:8081/enroll
{"challenge": "D2pzTPZa7bq69ABuiGQILo9zcsTURP26RLifTyCkilc", "version": "U2F_V2", "appId": "http://localhost:8081"}
----
The RegisterRequest data is then fed to the U2F client, resulting in the
RegisterResponse data, which is passed back to the server:
----
$ curl http://localhost:8081/bind -d'data={"clientData": "eyJvcmlnaW4iOiAiaHR0cDovL2xvY2FsaG9zdDo4MDgxIiwgImNoYWxsZW5nZSI6ICJEMnB6VFBaYTdicTY5QUJ1aUdRSUxvOXpjc1RVUlAyNlJMaWZUeUNraWxjIiwgInR5cCI6ICJuYXZpZ2F0b3IuaWQuZmluaXNoRW5yb2xsbWVudCJ9", "registrationData": "BQSivQtJ6-lAgZ2qQ0aUGLEiJSRoLWUSGcmMO8C-GuibA0-xTvmuQfTqKyFJZWOUjGzEIgF4xV6gJ6itcagsyuUWQEQh9noDSu-WtzTOMhK_lKHxwHtQgJHCkzs4mukfpf310K5Dq9k6zBNtZ2RMBWgJhI7hJo4JiFn3k2GUNLwKZpwwggGHMIIBLqADAgECAgkAmb7osQyi7BwwCQYHKoZIzj0EATAhMR8wHQYDVQQDDBZZdWJpY28gVTJGIFNvZnQgRGV2aWNlMB4XDTEzMDcxNzE0MjEwM1oXDTE2MDcxNjE0MjEwM1owITEfMB0GA1UEAwwWWXViaWNvIFUyRiBTb2Z0IERldmljZTBZMBMGByqGSM49AgEGCCqGSM49AwEHA0IABDvhl91zfpg9n7DeCedcQ8gGXUnemiXoi-JEAxz-EIhkVsMPAyzhtJZ4V3CqMZ-MOUgICt2aMxacMX9cIa8dgS2jUDBOMB0GA1UdDgQWBBQNqL-TV04iaO6mS5tjGE6ShfexnjAfBgNVHSMEGDAWgBQNqL-TV04iaO6mS5tjGE6ShfexnjAMBgNVHRMEBTADAQH_MAkGByqGSM49BAEDSAAwRQIgXJWZdbvOWdhVaG7IJtn44o21Kmi8EHsDk4cAfnZ0r38CIQD6ZPi3Pl4lXxbY7BXFyrpkiOvCpdyNdLLYbSTbvIBQOTBFAiEA1uwJKNez6_BHdA2d-DPmRFJj19biYNkhN86SFH5Z_lYCICld2L3ZAVsm_uNFRt13_N9dlhGu50pb1ql8-_3_p5v1"}'
true
----
The result, "true", indicates that registration was successful.

==== Authentication ====
Authentication for a previously registered U2F device is done by sending a
request to the server:

----
$ curl http://localhost:8081/sign
{"keyHandle": "RCH2egNK75a3NM4yEr-UofHAe1CAkcKTOzia6R-l_fXQrkOr2TrME21nZEwFaAmEjuEmjgmIWfeTYZQ0vApmnA", "challenge": "Ql05duFdQj6oc_mZf1Lt08PyXWJJxN5xe2SagdUGCxo", "version": "U2F_V2", "appId": "http://localhost:8081/app-identity"}
----
The AuthenticateRequest data is then fed to the U2F client, resulting in an
AuthenticateResponse object which is passed back to the server:
----
$ curl http://localhost:8081/verify -d'data={"clientData": "eyJvcmlHR0cDovL2xvY2FsaG9zdDo4MDgxIiwgImNoYWxsZW5nZSI6ICJlNGtScWk3eTdmUHdtZGZ1RnJ5WkxyVUhYby1BdF91YUFwWHdxdkV2UmxzIiwgInR5cCI6ICJuYXZpZ2F0b3IuaWQuZ2V0QXNzZXJ0aW9uIn0", "challenge": "e4kRqi7y7fPwmdfuFryZLrUHXo-At_uaApXwqvEvRls", "keyHandle": "RCH2egNK75a3NM4yEr-UofHAe1CAkcKTOzia6R-l_fXQrkOr2TrME21nZEwFaAmEjuEmjgmIWfeTYZQ0vApmnA", "signatureData": "AQAAAAIwRQIhAIyr0y4xg-pI8NhAUHJmaluGXwZ7yd5i0e7FQE4l9OaEAiB68JP-df7ro8ohxCcgyxfRiKrsY1J67kLcEuYb0MCrDg"}'
{"touch": "\u0001", "counter": 2}
----
The response indicates success, giving the U2F devices internal counter value,
as well as the value of the user presence parameter.