removed webauthn stuff, changed to password proxy

Dockerfile

@@ -9,4 +9,4 @@ from mcr.microsoft.com/dotnet/aspnet:7.0
 
 workdir /App
 copy --from=build-env /App/out .
-entrypoint ["dotnet", "webauthn-proxy.dll"]
+entrypoint ["dotnet", "auth-proxy.dll"]

README.md

@@ -1 +1 @@
-mostly taken from https://github.com/ferdinandkeil/nginxwebauthn
+Single user password proxy.

src/.editorconfig

@@ -13,7 +13,7 @@ indent_style = space
 [*.{cs,csx,vb,vbx}]
 indent_size = 2
 insert_final_newline = true
-charset = utf-8-bom
+charset = utf-8
 
 # XML project files
 [*.{csproj,vbproj,vcxproj,vcxproj.filters,proj,projitems,shproj}]
@@ -44,6 +44,9 @@ dotnet_diagnostic.IDE0055.severity = warning
 # CA1848: Use LoggerDelegates
 dotnet_diagnostic.CA1848.severity = none
 
+# CA1861: Prefer static readonly arrays
+dotnet_diagnostic.CA1861.severity = none
+
 # Sort using and Import directives with System.* appearing first
 dotnet_sort_system_directives_first = true
 dotnet_separate_import_directive_groups = false

src/Program.cs

@@ -1,57 +1,31 @@
-using System.Globalization;
+using System.Globalization;
 using System.Net;
 using System.Security.Cryptography;
-using System.Text;
-using System.Text.Json;
-using Fido2NetLib;
-using Fido2NetLib.Objects;
 using Microsoft.Data.Sqlite;
 using SQLitePCL;
 
-namespace WebauthnProxy;
-
-public class AddKeyRequest {
-  public required string Password { get; set; }
-  public required AuthenticatorAttestationRawResponse Response { get; set; }
-}
+namespace AuthProxy;
 
 public static class Program {
   private const string COOKIE_NAME = "__Secure-Token";
-  private const string SESS_ATTESTATION_KEY = "fido2.attestationOptions";
-  private const string SESS_ASSERTION_KEY = "fido2.assertionOptions";
 
   private static readonly string s_loginHtmlCache = File.ReadAllText(Path.Combine(
       AppDomain.CurrentDomain.BaseDirectory, "login.html"));
   private static readonly string? s_domain = Environment
-    .GetEnvironmentVariable("WEBAUTHN_DOMAIN");
+    .GetEnvironmentVariable("AUTH_DOMAIN");
   private static readonly string s_db = Environment
-    .GetEnvironmentVariable("WEBAUTHN_DB") ?? "credentials.db";
+    .GetEnvironmentVariable("AUTH_DB") ?? "credentials.db";
   private static readonly long s_lifetime = long.Parse(Environment
-    .GetEnvironmentVariable("WEBAUTHN_LIFETIME") ?? "7",
+    .GetEnvironmentVariable("AUTH_LIFETIME") ?? "7",
       CultureInfo.InvariantCulture) * 60 * 60 * 24;
   private static readonly string? s_password = Environment
-    .GetEnvironmentVariable("WEBAUTHN_PASSWORD");
+    .GetEnvironmentVariable("AUTH_PASSWORD");
   private static readonly int s_port = int.Parse(Environment
-    .GetEnvironmentVariable("WEBAUTHN_PORT") ?? "5000",
+    .GetEnvironmentVariable("AUTH_PORT") ?? "5000",
       CultureInfo.InvariantCulture);
-  private static readonly Dictionary<string, Fido2> s_fido2 = new();
-  private static readonly List<PublicKeyCredentialDescriptor> s_keys = new();
 
   private static string ConnectionString { get => $"Data Source={s_db}"; }
 
-  private static Fido2 GetFido2(HttpContext context) {
-    var origin = context.Request.Headers["Origin"].First()!;
-    if (!s_fido2.ContainsKey(origin)) {
-      s_fido2.Add(origin, new(new Fido2Configuration {
-        ServerDomain = s_domain ?? context.Request.Host.Value.Split(":").First(),
-        ServerName = "WebauthnProxy",
-        Origins = new(new[] { origin }),
-      }));
-    }
-
-    return s_fido2[origin];
-  }
-
   public static void Main(string[] args) {
     var app = Initialize(args);
     app.UseSession();
@@ -101,54 +75,10 @@ public static class Program {
       return Task.CompletedTask;
     });
 
-    app.MapPost("/auth/key", async (context) => {
-      var options = GetFido2(context).GetAssertionOptions(
-        s_keys, UserVerificationRequirement.Discouraged);
-      context.Session.SetString(SESS_ASSERTION_KEY,
-          JsonSerializer.Serialize(options));
-      await context.Response.WriteAsJsonAsync(options);
-    });
-
-    app.MapPost("/auth/complete", async (context) => {
-      var assertionResponse = await context.Request
-        .ReadFromJsonAsync<AuthenticatorAssertionRawResponse>();
-      if (assertionResponse == null) {
-        context.Response.StatusCode = 401;
-        await context.Response.WriteAsJsonAsync(new { error = "bad response" });
-        return;
-      }
-
-      var optsJson = context.Session.GetString(SESS_ASSERTION_KEY);
-      context.Session.Remove(SESS_ASSERTION_KEY);
-      var opts = AssertionOptions.FromJson(optsJson);
-      using var connection = new SqliteConnection(ConnectionString);
-      connection.Open();
-      byte[]? pubKey;
-      using (var cmd = new SqliteCommand(
-          "select key from credentials where id=@Id",
-          connection)) {
-        var param = cmd.CreateParameter();
-        param.ParameterName = "@Id";
-        param.Value = Convert.ToBase64String(assertionResponse.Id);
-        cmd.Parameters.Add(param);
-        pubKey = cmd.ExecuteScalar() is string keyStr
-          ? Convert.FromBase64String(keyStr)
-          : null;
-        if (pubKey == null) {
-          context.Response.StatusCode = 401;
-          await context.Response.WriteAsJsonAsync(new { error = "bad key" });
-          return;
-        }
-      }
-
-      var res = await GetFido2(context).MakeAssertionAsync(
-          assertionResponse, opts, pubKey, 0, (_, _) => Task.FromResult(true));
-      if (res.Status != "ok") {
-        context.Response.StatusCode = 401;
-        await context.Response.WriteAsJsonAsync(new { error = "auth failed" });
-        return;
-      }
-
+    app.MapPost("/auth", async (context) => {
+      if (context.Request.Form.TryGetValue("password", out var reqPassword)
+          && !string.IsNullOrEmpty(s_password)
+          && string.Equals(reqPassword, s_password, StringComparison.Ordinal)) {
         var cookieOpts = new CookieOptions {
           Path = "/",
           Secure = true,
@@ -160,71 +90,17 @@ public static class Program {
           cookieOpts.Domain = s_domain;
         }
 
+        using var connection = new SqliteConnection(ConnectionString);
+        await connection.OpenAsync();
         context.Response.Cookies.Append(
             COOKIE_NAME,
             GenerateToken(connection),
             cookieOpts);
         await context.Response.WriteAsJsonAsync(new { status = "ok" });
-    });
-
-    app.MapPost("/auth/new-key", async (context) => {
-      var user = new Fido2User {
-        Id = Encoding.UTF8.GetBytes("default"),
-        Name = "Default User",
-        DisplayName = "Default User",
-      };
-      var options = GetFido2(context).RequestNewCredential(
-        user,
-        new List<PublicKeyCredentialDescriptor>(),
-        AuthenticatorSelection.Default,
-        AttestationConveyancePreference.None);
-      context.Session.SetString(SESS_ATTESTATION_KEY,
-          JsonSerializer.Serialize(options));
-
-      await context.Response.WriteAsJsonAsync(options);
-    });
-
-    app.MapPost("/auth/add-key", async (context) => {
-      var req = await context.Request.ReadFromJsonAsync<AddKeyRequest>();
-      if (req == null) {
-        context.Response.StatusCode = 400;
-        await context.Response.WriteAsJsonAsync(new { error = "bad request" });
-        return;
-      }
-
-      if (string.IsNullOrEmpty(s_password)
-          || s_password != req.Password) {
+      } else {
         context.Response.StatusCode = 401;
         await context.Response.WriteAsJsonAsync(new { error = "bad password" });
-        return;
       }
-
-      var optsJson = context.Session.GetString(SESS_ATTESTATION_KEY);
-      context.Session.Remove(SESS_ATTESTATION_KEY);
-      var opts = CredentialCreateOptions.FromJson(optsJson);
-      var cred = await GetFido2(context).MakeNewCredentialAsync(
-          req.Response, opts, (_, _) => Task.FromResult(true));
-      var descriptor = new PublicKeyCredentialDescriptor(
-          cred.Result!.CredentialId);
-
-      // store in list and save to database
-      s_keys.Add(descriptor);
-      using var connection = new SqliteConnection(ConnectionString);
-      connection.Open();
-      using var cmd = new SqliteCommand(
-          @"insert into credentials (id, key) values (@Id, @Key)",
-          connection);
-      var idParam = cmd.CreateParameter();
-      idParam.ParameterName = "@Id";
-      idParam.Value = Convert.ToBase64String(cred.Result.CredentialId);
-      var keyParam = cmd.CreateParameter();
-      keyParam.ParameterName = "@Key";
-      keyParam.Value = Convert.ToBase64String(cred.Result.PublicKey);
-      cmd.Parameters.Add(idParam);
-      cmd.Parameters.Add(keyParam);
-      await cmd.ExecuteNonQueryAsync();
-
-      await context.Response.WriteAsJsonAsync(new { status = "ok" });
     });
 
     app.Run($"http://0.0.0.0:{s_port}");
@@ -287,7 +163,7 @@ public static class Program {
     connection.Open();
     using (var cmd = new SqliteCommand(
         @"select 1 from sqlite_master
-          where type='table' and name='credentials'",
+          where type='table' and name='tokens'",
         connection)) {
       var exists = cmd.ExecuteScalar();
       if (exists == null) {
@@ -304,19 +180,6 @@ public static class Program {
 
     RemoveExpiredTokens();
 
-    // read credentials
-    using (var cmd = new SqliteCommand(
-        @"select id from credentials",
-        connection)) {
-      var reader = cmd.ExecuteReader();
-      while (reader.Read()) {
-        var id = reader.GetString(0);
-        var desc = new PublicKeyCredentialDescriptor(
-            Convert.FromBase64String(id));
-        if (desc != null) s_keys.Add(desc);
-      }
-    }
-
     var builder = WebApplication.CreateBuilder(args);
     builder.Services.AddDistributedMemoryCache();
     builder.Services.AddSession();

src/auth-proxy.csproj

@@ -1,15 +1,13 @@
 <Project Sdk="Microsoft.NET.Sdk.Web">
 
   <PropertyGroup>
-    <TargetFramework>net7.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <Nullable>enable</Nullable>
     <ImplicitUsings>enable</ImplicitUsings>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Fido2" Version="3.0.1" />
-    <PackageReference Include="Fido2.Models" Version="3.0.1" />
-    <PackageReference Include="Microsoft.Data.SQLite" Version="7.0.5" />
+    <PackageReference Include="Microsoft.Data.SQLite" Version="8.0.4" />
   </ItemGroup>
 
   <ItemGroup>

src/login.html

@@ -1,102 +1,11 @@
 <!doctype html>
 <html lang='en'>
+  <head>
+    <title>RDSM.ca Login</title>
 <body>
-<script>
-function atobarray(sBase64) {
-  const sBinaryString = atob(sBase64.replace(/-/g, '+').replace(/_/g, '/'));
-  const aBinaryView = new Uint8Array(sBinaryString.length);
-  Array.prototype.forEach.call(aBinaryView, function (el, idx, arr) {
-    arr[idx] = sBinaryString.charCodeAt(idx);
-  });
-  return aBinaryView;
-}
-
-function barraytoa(arrayBuffer) {
-  return btoa(String.fromCharCode(...new Uint8Array(arrayBuffer)));
-}
-
-async function configure() {
-  try {
-    const data = await fetch('/auth/new-key', {
-      method: 'POST'
-    });
-    const json = await data.json();
-    json.challenge = atobarray(json.challenge);
-    json.user.id = atobarray(json.user.id);
-    const cred = await navigator.credentials.create({ publicKey: json });
-    var password = prompt('Administrative Password');
-    const addResp = await fetch('/auth/add-key', {
-      method: 'POST',
-      headers: {
-        "Content-Type": "application/json",
-      },
-      body: JSON.stringify({
-        password,
-        response : {
-          id: cred.id,
-          rawId: barraytoa(cred.rawId),
-          type: cred.type,
-          response: {
-            clientDataJSON: barraytoa(cred.response.clientDataJSON),
-            attestationObject: barraytoa(cred.response.attestationObject),
-          },
-        },
-      }),
-    });
-  } catch (e) {
-    console.log(e)
-  }
-}
-
-(async function init() {
-  try {
-    const data = await fetch('/auth/key', {
-      method: 'POST'
-    });
-    const json = await data.json();
-    let result;
-    if (json.allowCredentials !== undefined && json.allowCredentials.length > 0) {
-      json.challenge = atobarray(json.challenge);
-      for (let i = 0; i < json.allowCredentials.length; i++) {
-        json.allowCredentials[i].id =
-            atobarray(json.allowCredentials[i].id);
-      }
-      try {
-        result = await navigator.credentials.get({ publicKey: json });
-      } catch(e) {
-        console.log(e);
-        await configure();
-        return;
-      }
-      await fetch('/auth/complete', {
-        method: 'POST',
-        body: JSON.stringify({
-          id: result.id,
-          rawId: barraytoa(result.rawId),
-          type: result.type,
-          response: {
-            authenticatorData: barraytoa(result.response.authenticatorData),
-            clientDataJSON: barraytoa(result.response.clientDataJSON),
-            signature: barraytoa(result.response.signature),
-          },
-        }),
-        headers: { 'Content-Type': 'application/json' }
-      });
-      const params = await new URLSearchParams(window.location.search);
-      if (params.has('target')) {
-        window.location.href = params.get('target');
-      } else {
-        window.location.href = '/';
-      }
-    } else {
-      await configure();
-      window.location.href='/auth/login';
-    }
-  } catch(e) {
-    console.log(e);
-  }
-})()
-</script>
-<div id="command"></div>
+  <form action='/auth' method='post'>
+    <input type='password' name='password' />
+    <input type='submit' value='Login' />
+  </form>
 </body>
 </html>

src/schema.sql

@@ -1,9 +1,3 @@
-create table credentials (
-  id text primary key,
-  key text not null,
-  created_date datetime not null default CURRENT_TIMESTAMP
-);
-
 create table tokens (
   token text primary key,
   created_date datetime not null default CURRENT_TIMESTAMP