Ueberauth ADFS

Installation

The package can be installed by adding ueberauth_adfs to your list of dependencies in mix.exs:

def deps do
  [
    {:ueberauth_adfs, "~> 0.2.0"}
  ]
end

Docs can be found at https://hexdocs.pm/ueberauth_adfs.

Setting up ADFS

In ADFS >=3.0 setup a new Client using Powershell:

Add-AdfsClient -Name "OAUTH2 Client" -ClientId "unique-custom-client-id" -RedirectUri "http://localhost:4000/auth/adfs/callback"
Add-ADFSRelyingPartyTrust -Name "OAUTH2 Client" -Identifier "http://localhost:4000/auth/adfs"
Set-AdfsRelyingPartyTrust -IssuanceAuthorizationRulesFile "TransformRules.txt"

In TransformRules.txt put the following:

@RuleTemplate = "LdapClaims"
@RuleName = "User Details"
c:[Type == "http://schemas.microsoft.com/ws/2008/06/identity/claims/windowsaccountname", Issuer == "AD AUTHORITY"]
=> issue(store = "Active Directory", types = ("http://schemas.microsoft.com/ws/2008/06/identity/claims/windowsaccountname", "http://schemas.xmlsoap.org/ws/2005/05/identity/claims/givenname", "http://schemas.xmlsoap.org/ws/2005/05/identity/claims/surname", "http://schemas.xmlsoap.org/ws/2005/05/identity/claims/emailaddress", "groups", "userPrincipalName"), query = ";sAMAccountName,givenName,sn,mail,tokenGroups,userPrincipalName;{0}", param = c.Value);

Configuring Application

Add adfs_url and client_id to your configuration:

config :ueberauth, Ueberauth.Strategy.ADFS.OAuth,
  adfs_url: System.get_env("ADFS_URL"),
  adfs_metadata_url: System.get_env("ADFS_METADATA_URL"),
  adfs_handler: MyApp.ADFSHandler, # Optional, ability to provide handler to extract information from the token claims
  client_id: System.get_env("ADFS_CLIENT_ID"),
  resource_identifier: System.get_env("RESOURCE_IDENTIFIER")

Add ADFS provider to Ueberauth:

config :ueberauth, Ueberauth,
providers: [
  adfs: { Ueberauth.Strategy.ADFS,
    [
      #uid_field: :email,
      #request_path: "/auth/adfs",
      #callback_path: "/auth/adfs/callback"
    ]
  }
]

Optional: Create custom ADFS handler

defmodule MyApp.ADFSHandler do
  use Ueberauth.Strategy.ADFS.Handler

  def credentials(conn) do
    token = conn.private.adfs_token

    %Credentials{
      expires: token.claims["exp"] != nil,
      expires_at: token.claims["exp"],
      scopes: token.claims["aud"],
      token: token.token
    }
  end

  @doc false
  def info(conn) do
    user = conn.private.adfs_user

    %Info{
      nickname: user["winaccountname"],
      name: "#{user["given_name"]} #{user["family_name"]}",
      email: user["email"],
      first_name: user["given_name"],
      last_name: user["family_name"]
    }
  end

  @doc false
  def extra(conn) do
    user = conn.private.adfs_user

    %Extra{
      raw_info: %{
        token: conn.private[:adfs_token],
        user: user,
        groups: user["groups"]
      }
    }
  end
end