AdminandClaude Opus 4.8
45ce66a6ee
Tighten the stream-ticket authorization in the gateway middleware: - Enforce a path-segment boundary on the prefix check instead of a bare StartsWith, so a ticket for 'users/12' no longer grants 'users/1234/...' (exact-match still allowed for single-object grants) - Reject object keys containing '..'/'.' segments before proxying, closing a path-traversal bypass that SeaweedFS would otherwise resolve outside the authorized prefix Also simplify TicketValidator.ValidateTicketAsync from ErrorOr<string> to string? (null = invalid) since it has a single failure mode; drop the now unused ErrorOr package reference from the gateway. Verified: build clean; the authorization predicate passes a table of cases covering both the escalation and traversal vulnerabilities. Build: 0 warnings, 0 errors. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
59 lines
1.9 KiB
C#
59 lines
1.9 KiB
C#
using System.Security.Cryptography;
|
|
using Microsoft.Extensions.Options;
|
|
using Microsoft.IdentityModel.JsonWebTokens;
|
|
using Microsoft.IdentityModel.Tokens;
|
|
using Musify.StreamingGateway.Configuration;
|
|
|
|
namespace Musify.StreamingGateway.Authentication;
|
|
|
|
public sealed class TicketValidator : IDisposable
|
|
{
|
|
private readonly StreamTicketValidationOptions _options;
|
|
private readonly RSA _rsa;
|
|
private readonly TokenValidationParameters _validationParameters;
|
|
private readonly JsonWebTokenHandler _handler = new();
|
|
|
|
public TicketValidator(IOptions<StreamTicketValidationOptions> options)
|
|
{
|
|
_options = options.Value;
|
|
|
|
_rsa = RSA.Create();
|
|
_rsa.ImportFromPem(File.ReadAllText(_options.PublicKeyPath));
|
|
|
|
_validationParameters = new TokenValidationParameters
|
|
{
|
|
ValidateIssuer = true,
|
|
ValidIssuer = _options.Issuer,
|
|
ValidateAudience = true,
|
|
ValidAudience = _options.Audience,
|
|
ValidateLifetime = true,
|
|
ValidateIssuerSigningKey = true,
|
|
IssuerSigningKey = new RsaSecurityKey(_rsa),
|
|
ValidAlgorithms = [SecurityAlgorithms.RsaSha256],
|
|
ClockSkew = TimeSpan.FromSeconds(30),
|
|
};
|
|
}
|
|
|
|
/// <summary>
|
|
/// Validates the stream ticket and returns the authorized object-key prefix,
|
|
/// or <see langword="null"/> if the ticket is missing, invalid, or carries no prefix.
|
|
/// </summary>
|
|
public async Task<string?> ValidateTicketAsync(string? token)
|
|
{
|
|
if (string.IsNullOrWhiteSpace(token))
|
|
return null;
|
|
|
|
var result = await _handler.ValidateTokenAsync(token, _validationParameters);
|
|
if (!result.IsValid)
|
|
return null;
|
|
|
|
return result.Claims.TryGetValue("prefix", out var claim)
|
|
&& claim is string prefix
|
|
&& !string.IsNullOrEmpty(prefix)
|
|
? prefix
|
|
: null;
|
|
}
|
|
|
|
public void Dispose() => _rsa.Dispose();
|
|
}
|