wip passkey registration

AobaCore/Models/User.cs

@@ -1,4 +1,6 @@
-using Microsoft.IdentityModel.Tokens;
+using Fido2NetLib.Objects;
+
+using Microsoft.IdentityModel.Tokens;
 
 using MongoDB.Bson;
 using MongoDB.Bson.Serialization.Attributes;
@@ -19,6 +21,7 @@ public class User
 	public bool IsArgon { get; set; }
 	public ObjectId[] ApiKeys { get; set; } = [];
 	public List<ObjectId> RegTokens { get; set; } = [];
+	public List<PublicKeyCredentialDescriptor> CredentialDescriptors { get; set; } = [];
 
 	public ClaimsIdentity GetIdentity()
 	{

AobaCore/Services/AccountsService.cs

@@ -1,5 +1,7 @@
 using AobaCore.Models;
 
+using Fido2NetLib.Objects;
+
 using Isopoh.Cryptography.Argon2;
 
 using MongoDB.Bson;
@@ -54,13 +56,18 @@ public class AccountsService(IMongoDatabase db)
 		/* Get the salt */
 		byte[] salt = new byte[16];
 		Array.Copy(hashBytes, 0, salt, 0, 16);
-		/* Compute the hash on the password the user entered */
-		var pbkdf2 = new Rfc2898DeriveBytes(password, salt, 10000, HashAlgorithmName.SHA1);
-		byte[] hash = pbkdf2.GetBytes(20);
+
+		var hash= Rfc2898DeriveBytes.Pbkdf2(password, salt, 10000, HashAlgorithmName.SHA1, 20);
 		/* Compare the results */
 		for (int i = 0; i < 20; i++)
 			if (hashBytes[i + 16] != hash[i])
 				return false;
 		return true;
 	}
+
+	public async Task<List<PublicKeyCredentialDescriptor>> GetPublicKeyCredentialDescriptorsAsync(ObjectId id, CancellationToken cancellationToken = default)
+	{
+		var creds = await _users.Find(u => u.Id == id).Project(u => u.CredentialDescriptors).FirstOrDefaultAsync(cancellationToken);
+		return creds ?? [];
+	}
 }

AobaServer/Program.cs

@@ -121,6 +121,16 @@ builder.Services.AddAuthentication(options =>
 
 
 builder.Services.AddAoba();
+builder.Services.AddFido2(opts =>
+{
+	opts.ServerName = "Aoba";
+	opts.ServerDomain = "aoba.app";
+#if DEBUG
+	opts.Origins = new HashSet<string> { "http://localhost:8081", "http://127.0.0.1:8080" };
+#else
+	opts.Origins = new HashSet<string> { "https://aoba.app" };
+#endif
+});
 #if DEBUG
 builder.Services.AddHostedService<DebugService>();
 #endif

AobaServer/Proto/Account.proto

@@ -7,7 +7,7 @@ import "google/protobuf/empty.proto";
 import "Proto/Types.proto";
 
 service AccountRpc {
-	rpc RegisterPasskey(google.protobuf.Empty) returns (PasskeyRegistrationCreds);
-	rpc CompletePasskeyRegistration(PasskeyPublicKey) returns (google.protobuf.Empty);
+	rpc RegisterPasskey(google.protobuf.Empty) returns (PasskeyCredentialCreateOptions);
+	rpc CompletePasskeyRegistration(PasskeyRegistrationCredentials) returns (google.protobuf.Empty);
 }
 

AobaServer/Proto/Types.proto

@@ -121,9 +121,19 @@ message PasskeyPayload {
 
 }
 
-message PasskeyRegistrationCreds{
-
+message PasskeyCredentialCreateOptions{
+	string challenge = 1;
+	string userId = 2;
+}
+message PasskeyRegistrationCredentials{
+	string id = 1;
+	string rawId = 2;
+	string type = 3;
+	CredentialsClientResponse response = 4;
 }
-message PasskeyPublicKey{
 
+message CredentialsClientResponse{
+	string clientDataJSON = 1;
+	string attestationObject = 2;
+	string authenticatorData = 3;
 }

AobaServer/Services/AccountRpcService.cs

@@ -1,20 +1,47 @@
 using Aoba.RPC;
 using Aoba.RPC.Account;
 
+using AobaCore.Services;
+
+using AobaServer.Utils;
+
+using Fido2NetLib;
+
 using Google.Protobuf.WellKnownTypes;
 
 using Grpc.Core;
 
+using Isopoh.Cryptography.Argon2;
+
 namespace AobaServer.Services;
 
-public class AccountRpcService : AccountRpc.AccountRpcBase
+public class AccountRpcService(IFido2 fido2, AccountsService accounts) : AccountRpc.AccountRpcBase
 {
-	public override Task<PasskeyRegistrationCreds> RegisterPasskey(Empty request, ServerCallContext context)
+	public override async Task<PasskeyCredentialCreateOptions> RegisterPasskey(Empty request, ServerCallContext context)
 	{
-		return base.RegisterPasskey(request, context);
+		var curUser = await accounts.GetUserAsync(context.GetUserId(), context.CancellationToken);
+		if (curUser == null)
+			throw new Exception($"Logged in user does not exist somehow. Id: {context.GetUserId()}");
+		var user = new Fido2User
+		{
+			DisplayName = curUser.Username,
+			Id = curUser.Id.ToByteArray(),
+			Name = curUser.Username
+		};
+
+		var credOptions = fido2.RequestNewCredential(new RequestNewCredentialParams
+		{
+			User = user,
+			ExcludeCredentials = curUser.CredentialDescriptors
+		});
+		return new PasskeyCredentialCreateOptions
+		{
+			Challenge = credOptions.Challenge.ToB64String().Replace('+', '-').Replace('/', '_'),
+			UserId = credOptions.User.Id.ToB64String().Replace('+', '-').Replace('/', '_')
+		};
 	}
 
-	public override Task<Empty> CompletePasskeyRegistration(PasskeyPublicKey request, ServerCallContext context)
+	public override Task<Empty> CompletePasskeyRegistration(PasskeyRegistrationCredentials request, ServerCallContext context)
 	{
 		return base.CompletePasskeyRegistration(request, context);
 	}