560 lines
		
	
	
		
			21 KiB
		
	
	
	
		
			C#
		
	
	
	
	
	
			
		
		
	
	
			560 lines
		
	
	
		
			21 KiB
		
	
	
	
		
			C#
		
	
	
	
	
	
using System.IdentityModel.Tokens.Jwt;
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using System.Security.Claims;
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using System.Security.Cryptography;
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using System.Text;
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using DysonNetwork.Pass.Auth.OidcProvider.Models;
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using DysonNetwork.Pass.Auth.OidcProvider.Options;
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using DysonNetwork.Pass.Auth.OidcProvider.Responses;
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using DysonNetwork.Shared.Cache;
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using DysonNetwork.Shared.Models;
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using DysonNetwork.Shared.Proto;
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using Microsoft.EntityFrameworkCore;
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using Microsoft.Extensions.Options;
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using Microsoft.IdentityModel.Tokens;
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using NodaTime;
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using AccountContactType = DysonNetwork.Shared.Models.AccountContactType;
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namespace DysonNetwork.Pass.Auth.OidcProvider.Services;
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public class OidcProviderService(
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    AppDatabase db,
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    AuthService auth,
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    CustomAppService.CustomAppServiceClient customApps,
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    ICacheService cache,
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    IOptions<OidcProviderOptions> options,
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    ILogger<OidcProviderService> logger
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)
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{
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    private readonly OidcProviderOptions _options = options.Value;
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    private const string CacheKeyPrefixClientId = "auth:oidc-client:id:";
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    private const string CacheKeyPrefixClientSlug = "auth:oidc-client:slug:";
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    private const string CacheKeyPrefixAuthCode = "auth:oidc-code:";
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    private const string CodeChallengeMethodS256 = "S256";
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    private const string CodeChallengeMethodPlain = "PLAIN";
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    public async Task<CustomApp?> FindClientByIdAsync(Guid clientId)
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    {
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        var cacheKey = $"{CacheKeyPrefixClientId}{clientId}";
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        var (found, cachedApp) = await cache.GetAsyncWithStatus<CustomApp>(cacheKey);
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        if (found && cachedApp != null)
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        {
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            return cachedApp;
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        }
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        var resp = await customApps.GetCustomAppAsync(new GetCustomAppRequest { Id = clientId.ToString() });
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        if (resp.App != null)
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        {
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            await cache.SetAsync(cacheKey, resp.App, TimeSpan.FromMinutes(5));
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        }
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        return resp.App ?? null;
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    }
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    public async Task<CustomApp?> FindClientBySlugAsync(string slug)
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    {
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        var cacheKey = $"{CacheKeyPrefixClientSlug}{slug}";
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        var (found, cachedApp) = await cache.GetAsyncWithStatus<CustomApp>(cacheKey);
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        if (found && cachedApp != null)
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        {
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            return cachedApp;
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        }
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        var resp = await customApps.GetCustomAppAsync(new GetCustomAppRequest { Slug = slug });
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        if (resp.App != null)
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        {
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            await cache.SetAsync(cacheKey, resp.App, TimeSpan.FromMinutes(5));
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        }
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        return resp.App ?? null;
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    }
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    private async Task<SnAuthSession?> FindValidSessionAsync(Guid accountId, Guid clientId, bool withAccount = false)
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    {
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        var now = SystemClock.Instance.GetCurrentInstant();
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        var queryable = db.AuthSessions
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            .Include(s => s.Challenge)
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            .AsQueryable();
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        if (withAccount)
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            queryable = queryable
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                .Include(s => s.Account)
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                .ThenInclude(a => a.Profile)
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                .Include(a => a.Account.Contacts)
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                .AsQueryable();
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        return await queryable
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            .Where(s => s.AccountId == accountId &&
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                        s.AppId == clientId &&
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                        (s.ExpiredAt == null || s.ExpiredAt > now) &&
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                        s.Challenge != null &&
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                        s.Challenge.Type == Shared.Models.ChallengeType.OAuth)
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            .OrderByDescending(s => s.CreatedAt)
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            .FirstOrDefaultAsync();
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    }
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    public async Task<bool> ValidateClientCredentialsAsync(Guid clientId, string clientSecret)
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    {
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        var resp = await customApps.CheckCustomAppSecretAsync(new CheckCustomAppSecretRequest
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        {
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            AppId = clientId.ToString(),
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            Secret = clientSecret,
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            IsOidc = true
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        });
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        return resp.Valid;
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    }
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    private static bool IsWildcardRedirectUriMatch(string allowedUri, string redirectUri)
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    {
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        if (string.IsNullOrEmpty(allowedUri) || string.IsNullOrEmpty(redirectUri))
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            return false;
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        // Check if it's an exact match
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        if (string.Equals(allowedUri, redirectUri, StringComparison.Ordinal))
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            return true;
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        // Quick check for wildcard patterns
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        if (!allowedUri.Contains('*'))
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            return false;
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        // Parse URIs once
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        Uri? allowedUriObj, redirectUriObj;
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        try
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        {
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            allowedUriObj = new Uri(allowedUri);
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            redirectUriObj = new Uri(redirectUri);
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        }
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        catch (UriFormatException)
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        {
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            return false;
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        }
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        // Check scheme and port matches
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        if (allowedUriObj.Scheme != redirectUriObj.Scheme || allowedUriObj.Port != redirectUriObj.Port)
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        {
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            return false;
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        }
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        var allowedHost = allowedUriObj.Host;
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        var redirectHost = redirectUriObj.Host;
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        // Handle wildcard domain patterns like *.example.com
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        if (allowedHost.StartsWith("*."))
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        {
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            var baseDomain = allowedHost[2..]; // Remove "*."
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            if (redirectHost == baseDomain || redirectHost.EndsWith("." + baseDomain))
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            {
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                // Check path match
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                var allowedPath = allowedUriObj.AbsolutePath.TrimEnd('/');
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                var redirectPath = redirectUriObj.AbsolutePath.TrimEnd('/');
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                // If allowed path is empty, any path is allowed
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                // If allowed path is specified, redirect path must start with it
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                return string.IsNullOrEmpty(allowedPath) ||
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                       redirectPath.StartsWith(allowedPath, StringComparison.OrdinalIgnoreCase);
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            }
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        }
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        return false;
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    }
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    public async Task<bool> ValidateRedirectUriAsync(Guid clientId, string redirectUri)
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    {
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        if (string.IsNullOrEmpty(redirectUri))
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            return false;
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        var client = await FindClientByIdAsync(clientId);
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        if (client?.Status != Shared.Proto.CustomAppStatus.Production)
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            return true;
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        var redirectUris = client?.OauthConfig?.RedirectUris;
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        if (redirectUris == null || redirectUris.Count == 0)
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            return false;
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        // Check each allowed URI for a match
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        foreach (var allowedUri in redirectUris)
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        {
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            if (IsWildcardRedirectUriMatch(allowedUri, redirectUri))
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            {
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                return true;
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            }
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        }
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        return false;
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    }
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    private string GenerateIdToken(
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        CustomApp client,
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        SnAuthSession session,
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        string? nonce = null,
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        IEnumerable<string>? scopes = null
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    )
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    {
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        var tokenHandler = new JwtSecurityTokenHandler();
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        var clock = SystemClock.Instance;
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        var now = clock.GetCurrentInstant();
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        var claims = new List<Claim>
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        {
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            new(JwtRegisteredClaimNames.Iss, _options.IssuerUri),
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            new(JwtRegisteredClaimNames.Sub, session.AccountId.ToString()),
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            new(JwtRegisteredClaimNames.Aud, client.Slug),
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            new(JwtRegisteredClaimNames.Iat, now.ToUnixTimeSeconds().ToString(), ClaimValueTypes.Integer64),
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            new(JwtRegisteredClaimNames.Exp,
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                now.Plus(Duration.FromSeconds(_options.AccessTokenLifetime.TotalSeconds)).ToUnixTimeSeconds()
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                    .ToString(), ClaimValueTypes.Integer64),
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            new(JwtRegisteredClaimNames.AuthTime, session.CreatedAt.ToUnixTimeSeconds().ToString(),
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                ClaimValueTypes.Integer64),
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        };
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        // Add nonce if provided (required for implicit and hybrid flows)
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        if (!string.IsNullOrEmpty(nonce))
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        {
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            claims.Add(new Claim("nonce", nonce));
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        }
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        // Add email claim if email scope is requested
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        var scopesList = scopes?.ToList() ?? [];
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        if (scopesList.Contains("email"))
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        {
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            var contact = session.Account.Contacts.FirstOrDefault(c => c.Type == AccountContactType.Email);
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            if (contact is not null)
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            {
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                claims.Add(new Claim(JwtRegisteredClaimNames.Email, contact.Content));
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                claims.Add(new Claim("email_verified", contact.VerifiedAt is not null ? "true" : "false",
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                    ClaimValueTypes.Boolean));
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            }
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        }
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        // Add profile claims if profile scope is requested
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        if (scopes != null && scopesList.Contains("profile"))
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        {
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            if (!string.IsNullOrEmpty(session.Account.Name))
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                claims.Add(new Claim("preferred_username", session.Account.Name));
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            if (!string.IsNullOrEmpty(session.Account.Nick))
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                claims.Add(new Claim("name", session.Account.Nick));
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            if (!string.IsNullOrEmpty(session.Account.Profile.FirstName))
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                claims.Add(new Claim("given_name", session.Account.Profile.FirstName));
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            if (!string.IsNullOrEmpty(session.Account.Profile.LastName))
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                claims.Add(new Claim("family_name", session.Account.Profile.LastName));
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        }
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        claims.Add(new Claim(JwtRegisteredClaimNames.Azp, client.Slug));
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        var tokenDescriptor = new SecurityTokenDescriptor
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        {
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            Subject = new ClaimsIdentity(claims),
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            Issuer = _options.IssuerUri,
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            Audience = client.Slug.ToString(),
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            Expires = now.Plus(Duration.FromSeconds(_options.AccessTokenLifetime.TotalSeconds)).ToDateTimeUtc(),
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            NotBefore = now.ToDateTimeUtc(),
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            SigningCredentials = new SigningCredentials(
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                new RsaSecurityKey(_options.GetRsaPrivateKey()),
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                SecurityAlgorithms.RsaSha256
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            )
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        };
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        var token = tokenHandler.CreateToken(tokenDescriptor);
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        return tokenHandler.WriteToken(token);
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    }
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    private async Task<(SnAuthSession session, string? nonce, List<string>? scopes)> HandleAuthorizationCodeFlowAsync(
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        string authorizationCode,
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        Guid clientId,
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        string? redirectUri,
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        string? codeVerifier
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    )
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    {
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        var authCode = await ValidateAuthorizationCodeAsync(authorizationCode, clientId, redirectUri, codeVerifier);
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        if (authCode == null)
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            throw new InvalidOperationException("Invalid authorization code");
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        // Load the session for the user
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        var existingSession = await FindValidSessionAsync(authCode.AccountId, clientId, withAccount: true);
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        SnAuthSession session;
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        if (existingSession == null)
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        {
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            var account = await db.Accounts
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                .Where(a => a.Id == authCode.AccountId)
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                .Include(a => a.Profile)
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                .Include(a => a.Contacts)
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                .FirstOrDefaultAsync();
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            if (account == null) throw new InvalidOperationException("Account not found");
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            session = await auth.CreateSessionForOidcAsync(account, SystemClock.Instance.GetCurrentInstant(), clientId);
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            session.Account = account;
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        }
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        else
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        {
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            session = existingSession;
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        }
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        return (session, authCode.Nonce, authCode.Scopes);
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    }
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    private async Task<(SnAuthSession session, string? nonce, List<string>? scopes)> HandleRefreshTokenFlowAsync(Guid sessionId)
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    {
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        var session = await FindSessionByIdAsync(sessionId) ??
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                      throw new InvalidOperationException("Session not found");
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        // Verify the session is still valid
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        var now = SystemClock.Instance.GetCurrentInstant();
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        if (session.ExpiredAt.HasValue && session.ExpiredAt < now)
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            throw new InvalidOperationException("Session has expired");
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        return (session, null, null);
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    }
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    public async Task<TokenResponse> GenerateTokenResponseAsync(
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        Guid clientId,
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        string? authorizationCode = null,
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        string? redirectUri = null,
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        string? codeVerifier = null,
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        Guid? sessionId = null
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    )
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    {
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        if (clientId == Guid.Empty) throw new ArgumentException("Client ID cannot be empty", nameof(clientId));
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        var client = await FindClientByIdAsync(clientId) ?? throw new InvalidOperationException("Client not found");
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        var (session, nonce, scopes) = authorizationCode != null
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            ? await HandleAuthorizationCodeFlowAsync(authorizationCode, clientId, redirectUri, codeVerifier)
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            : sessionId.HasValue
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                ? await HandleRefreshTokenFlowAsync(sessionId.Value)
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                : throw new InvalidOperationException("Either authorization code or session ID must be provided");
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        var clock = SystemClock.Instance;
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        var now = clock.GetCurrentInstant();
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        var expiresIn = (int)_options.AccessTokenLifetime.TotalSeconds;
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        var expiresAt = now.Plus(Duration.FromSeconds(expiresIn));
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        // Generate tokens
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        var accessToken = GenerateJwtToken(client, session, expiresAt, scopes);
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        var idToken = GenerateIdToken(client, session, nonce, scopes);
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        var refreshToken = GenerateRefreshToken(session);
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        return new TokenResponse
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        {
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            AccessToken = accessToken,
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            IdToken = idToken,
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            ExpiresIn = expiresIn,
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            TokenType = "Bearer",
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            RefreshToken = refreshToken,
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            Scope = scopes != null ? string.Join(" ", scopes) : null
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        };
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    }
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    private string GenerateJwtToken(
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        CustomApp client,
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        SnAuthSession session,
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        Instant expiresAt,
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        IEnumerable<string>? scopes = null
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    )
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    {
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        var tokenHandler = new JwtSecurityTokenHandler();
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        var clock = SystemClock.Instance;
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        var now = clock.GetCurrentInstant();
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        var tokenDescriptor = new SecurityTokenDescriptor
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        {
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            Subject = new ClaimsIdentity([
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                new Claim(JwtRegisteredClaimNames.Sub, session.AccountId.ToString()),
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                new Claim(JwtRegisteredClaimNames.Jti, session.Id.ToString()),
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                new Claim(JwtRegisteredClaimNames.Iat, now.ToUnixTimeSeconds().ToString(),
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                    ClaimValueTypes.Integer64),
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                new Claim(JwtRegisteredClaimNames.Azp, client.Slug),
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            ]),
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            Expires = expiresAt.ToDateTimeUtc(),
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            Issuer = _options.IssuerUri,
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            Audience = client.Slug
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        };
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        // Try to use RSA signing if keys are available, fall back to HMAC
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        var rsaPrivateKey = _options.GetRsaPrivateKey();
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        tokenDescriptor.SigningCredentials = new SigningCredentials(
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            new RsaSecurityKey(rsaPrivateKey),
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            SecurityAlgorithms.RsaSha256
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        );
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        // Add scopes as claims if provided
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        var effectiveScopes = scopes?.ToList() ?? client.OauthConfig!.AllowedScopes?.ToList() ?? [];
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        if (effectiveScopes.Count != 0)
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        {
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            tokenDescriptor.Subject.AddClaims(
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                effectiveScopes.Select(scope => new Claim("scope", scope)));
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        }
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        var token = tokenHandler.CreateToken(tokenDescriptor);
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        return tokenHandler.WriteToken(token);
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    }
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    public (bool isValid, JwtSecurityToken? token) ValidateToken(string token)
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    {
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        try
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        {
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            var tokenHandler = new JwtSecurityTokenHandler();
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            var validationParameters = new TokenValidationParameters
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            {
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                ValidateIssuer = true,
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                ValidIssuer = _options.IssuerUri,
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                ValidateAudience = false,
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                ValidateLifetime = true,
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                ClockSkew = TimeSpan.Zero
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            };
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            // Try to use RSA validation if public key is available
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            var rsaPublicKey = _options.GetRsaPublicKey();
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            validationParameters.IssuerSigningKey = new RsaSecurityKey(rsaPublicKey);
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            validationParameters.ValidateIssuerSigningKey = true;
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            validationParameters.ValidAlgorithms = new[] { SecurityAlgorithms.RsaSha256 };
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            tokenHandler.ValidateToken(token, validationParameters, out var validatedToken);
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            return (true, (JwtSecurityToken)validatedToken);
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        }
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        catch (Exception ex)
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        {
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            logger.LogError(ex, "Token validation failed");
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            return (false, null);
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        }
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    }
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    public async Task<SnAuthSession?> FindSessionByIdAsync(Guid sessionId)
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    {
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        return await db.AuthSessions
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            .Include(s => s.Account)
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            .Include(s => s.Challenge)
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            .FirstOrDefaultAsync(s => s.Id == sessionId);
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    }
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    private static string GenerateRefreshToken(SnAuthSession session)
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    {
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        return Convert.ToBase64String(session.Id.ToByteArray());
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    }
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    public async Task<string> GenerateAuthorizationCodeAsync(
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        Guid clientId,
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        Guid userId,
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        string redirectUri,
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        IEnumerable<string> scopes,
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        string? codeChallenge = null,
 | 
						|
        string? codeChallengeMethod = null,
 | 
						|
        string? nonce = null
 | 
						|
    )
 | 
						|
    {
 | 
						|
        // Generate a random code
 | 
						|
        var clock = SystemClock.Instance;
 | 
						|
        var code = GenerateRandomString(32);
 | 
						|
        var now = clock.GetCurrentInstant();
 | 
						|
 | 
						|
        // Create the authorization code info
 | 
						|
        var authCodeInfo = new AuthorizationCodeInfo
 | 
						|
        {
 | 
						|
            ClientId = clientId,
 | 
						|
            AccountId = userId,
 | 
						|
            RedirectUri = redirectUri,
 | 
						|
            Scopes = scopes.ToList(),
 | 
						|
            CodeChallenge = codeChallenge,
 | 
						|
            CodeChallengeMethod = codeChallengeMethod,
 | 
						|
            Nonce = nonce,
 | 
						|
            CreatedAt = now
 | 
						|
        };
 | 
						|
 | 
						|
        // Store the code with its metadata in the cache
 | 
						|
        var cacheKey = $"{CacheKeyPrefixAuthCode}{code}";
 | 
						|
        await cache.SetAsync(cacheKey, authCodeInfo, _options.AuthorizationCodeLifetime);
 | 
						|
 | 
						|
        logger.LogInformation("Generated authorization code for client {ClientId} and user {UserId}", clientId, userId);
 | 
						|
        return code;
 | 
						|
    }
 | 
						|
 | 
						|
    private async Task<AuthorizationCodeInfo?> ValidateAuthorizationCodeAsync(
 | 
						|
        string code,
 | 
						|
        Guid clientId,
 | 
						|
        string? redirectUri = null,
 | 
						|
        string? codeVerifier = null
 | 
						|
    )
 | 
						|
    {
 | 
						|
        var cacheKey = $"{CacheKeyPrefixAuthCode}{code}";
 | 
						|
        var (found, authCode) = await cache.GetAsyncWithStatus<AuthorizationCodeInfo>(cacheKey);
 | 
						|
 | 
						|
        if (!found || authCode == null)
 | 
						|
        {
 | 
						|
            logger.LogWarning("Authorization code not found: {Code}", code);
 | 
						|
            return null;
 | 
						|
        }
 | 
						|
 | 
						|
        // Verify client ID matches
 | 
						|
        if (authCode.ClientId != clientId)
 | 
						|
        {
 | 
						|
            logger.LogWarning(
 | 
						|
                "Client ID mismatch for code {Code}. Expected: {ExpectedClientId}, Actual: {ActualClientId}",
 | 
						|
                code, authCode.ClientId, clientId);
 | 
						|
            return null;
 | 
						|
        }
 | 
						|
 | 
						|
        // Verify redirect URI if provided
 | 
						|
        if (!string.IsNullOrEmpty(redirectUri) && authCode.RedirectUri != redirectUri)
 | 
						|
        {
 | 
						|
            logger.LogWarning("Redirect URI mismatch for code {Code}", code);
 | 
						|
            return null;
 | 
						|
        }
 | 
						|
 | 
						|
        // Verify PKCE code challenge if one was provided during authorization
 | 
						|
        if (!string.IsNullOrEmpty(authCode.CodeChallenge))
 | 
						|
        {
 | 
						|
            if (string.IsNullOrEmpty(codeVerifier))
 | 
						|
            {
 | 
						|
                logger.LogWarning("PKCE code verifier is required but not provided for code {Code}", code);
 | 
						|
                return null;
 | 
						|
            }
 | 
						|
 | 
						|
            var isValid = authCode.CodeChallengeMethod?.ToUpperInvariant() switch
 | 
						|
            {
 | 
						|
                CodeChallengeMethodS256 => VerifyCodeChallenge(codeVerifier, authCode.CodeChallenge, CodeChallengeMethodS256),
 | 
						|
                CodeChallengeMethodPlain => VerifyCodeChallenge(codeVerifier, authCode.CodeChallenge, CodeChallengeMethodPlain),
 | 
						|
                _ => false // Unsupported code challenge method
 | 
						|
            };
 | 
						|
 | 
						|
            if (!isValid)
 | 
						|
            {
 | 
						|
                logger.LogWarning("PKCE code verifier validation failed for code {Code}", code);
 | 
						|
                return null;
 | 
						|
            }
 | 
						|
        }
 | 
						|
 | 
						|
        // Code is valid, remove it from the cache (codes are single-use)
 | 
						|
        await cache.RemoveAsync(cacheKey);
 | 
						|
 | 
						|
        return authCode;
 | 
						|
    }
 | 
						|
 | 
						|
    private static string GenerateRandomString(int length)
 | 
						|
    {
 | 
						|
        const string chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-._~";
 | 
						|
        var random = RandomNumberGenerator.Create();
 | 
						|
        var result = new char[length];
 | 
						|
 | 
						|
        for (int i = 0; i < length; i++)
 | 
						|
        {
 | 
						|
            var randomNumber = new byte[4];
 | 
						|
            random.GetBytes(randomNumber);
 | 
						|
            var index = (int)(BitConverter.ToUInt32(randomNumber, 0) % chars.Length);
 | 
						|
            result[i] = chars[index];
 | 
						|
        }
 | 
						|
 | 
						|
        return new string(result);
 | 
						|
    }
 | 
						|
 | 
						|
    private static bool VerifyCodeChallenge(string codeVerifier, string codeChallenge, string method)
 | 
						|
    {
 | 
						|
        if (string.IsNullOrEmpty(codeVerifier)) return false;
 | 
						|
 | 
						|
        if (method != CodeChallengeMethodS256)
 | 
						|
            return method == CodeChallengeMethodPlain &&
 | 
						|
                   string.Equals(codeVerifier, codeChallenge, StringComparison.Ordinal);
 | 
						|
        var hash = SHA256.HashData(Encoding.UTF8.GetBytes(codeVerifier));
 | 
						|
        var base64 = Base64UrlEncoder.Encode(hash);
 | 
						|
 | 
						|
        return string.Equals(base64, codeChallenge, StringComparison.Ordinal);
 | 
						|
    }
 | 
						|
}
 |