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d12b57cb71
This adds support for providing a custom defined token instead of using the JWT tokens. The intended use is for deployments where the authentication is provide by a different layer (a proxy service).
84 lines
No EOL
3.5 KiB
C#
84 lines
No EOL
3.5 KiB
C#
// Copyright (C) 2025, The Duplicati Team
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// https://duplicati.com, hello@duplicati.com
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//
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// Permission is hereby granted, free of charge, to any person obtaining a
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// copy of this software and associated documentation files (the "Software"),
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// to deal in the Software without restriction, including without limitation
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// the rights to use, copy, modify, merge, publish, distribute, sublicense,
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// and/or sell copies of the Software, and to permit persons to whom the
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// Software is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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using System.Security.Claims;
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using System.Text.Encodings.Web;
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using Microsoft.AspNetCore.Authentication;
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using Microsoft.Extensions.Options;
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namespace Duplicati.WebserverCore.Services;
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/// <summary>
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/// Configuration for the PreAuthTokenHandler
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/// </summary>
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/// <param name="AllowedTokens">The tokens that are allowed</param>
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public record PreAuthTokenConfig(IReadOnlySet<string> AllowedTokens);
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/// <summary>
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/// Handler for pre-authenticated tokens
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/// </summary>
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/// <param name="options">The options for the handler</param>
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/// <param name="logger">The logger</param>
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/// <param name="encoder">The URL encoder</param>
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/// <param name="config">The configuration</param>
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public class PreAuthTokenHandler(
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IOptionsMonitor<AuthenticationSchemeOptions> options,
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ILoggerFactory logger,
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UrlEncoder encoder,
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PreAuthTokenConfig config
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) : AuthenticationHandler<AuthenticationSchemeOptions>(options, logger, encoder)
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{
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/// <summary>
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/// The name of the scheme
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/// </summary>
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public const string SchemeName = "PreAuth";
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/// <summary>
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/// The sheme prefix to look for in the header
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/// </summary>
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public const string SchemePrefix = SchemeName + " ";
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/// <summary>
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/// Handles the authentication
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/// </summary>
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/// <returns>The result of the authentication</returns>
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protected override Task<AuthenticateResult> HandleAuthenticateAsync()
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{
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string? token = null;
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var authHeader = Request.Headers["Authorization"].ToString();
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if (!string.IsNullOrWhiteSpace(authHeader) && authHeader.StartsWith(SchemePrefix, StringComparison.OrdinalIgnoreCase))
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token = authHeader.Substring(SchemePrefix.Length).Trim();
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// Support for websocket authentication (should be fixed with messages)
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if (string.IsNullOrWhiteSpace(authHeader) && string.IsNullOrWhiteSpace(token))
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token = Request.Query["token"];
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if (!string.IsNullOrWhiteSpace(token) && config.AllowedTokens.Contains(token))
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{
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var identity = new ClaimsIdentity([], Scheme.Name);
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var principal = new ClaimsPrincipal(identity);
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var ticket = new AuthenticationTicket(principal, Scheme.Name);
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return Task.FromResult(AuthenticateResult.Success(ticket));
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}
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return Task.FromResult(AuthenticateResult.Fail("Invalid PreAuth token"));
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}
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} |