/
DiscoveryDocumentResponse.cs
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/
DiscoveryDocumentResponse.cs
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// Copyright (c) Brock Allen & Dominick Baier. All rights reserved.
// Licensed under the Apache License, Version 2.0. See LICENSE in the project root for license information.
using IdentityModel.Internal;
using IdentityModel.Jwk;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.Json;
using System.Threading.Tasks;
#pragma warning disable 1591
namespace IdentityModel.Client;
/// <summary>
/// Models the response from an OpenID Connect discovery endpoint
/// </summary>
public class DiscoveryDocumentResponse : ProtocolResponse
{
public DiscoveryPolicy Policy { get; set; } = default!;
protected override Task InitializeAsync(object? initializationData = null)
{
if (HttpResponse?.IsSuccessStatusCode != true)
{
ErrorMessage = initializationData as string;
return Task.CompletedTask;
}
Policy = initializationData as DiscoveryPolicy ?? new DiscoveryPolicy();
var validationError = Validate(Policy);
if (validationError.IsPresent())
{
Json = default;
ErrorType = ResponseErrorType.PolicyViolation;
ErrorMessage = validationError;
}
MtlsEndpointAliases =
new MtlsEndpointAliases(Json?.TryGetValue(OidcConstants.Discovery.MtlsEndpointAliases));
return Task.CompletedTask;
}
/// <summary>
/// Gets or sets the JSON web key set.
/// </summary>
/// <value>
/// The key set.
/// </value>
public JsonWebKeySet? KeySet { get; set; }
/// <summary>
/// Gets the MTLS endpoint aliases
/// </summary>
/// <value>
/// The key set.
/// </value>
public MtlsEndpointAliases? MtlsEndpointAliases { get; internal set; }
// strongly typed
public string? Issuer => TryGetString(OidcConstants.Discovery.Issuer);
public string? AuthorizeEndpoint => TryGetString(OidcConstants.Discovery.AuthorizationEndpoint);
public string? TokenEndpoint => TryGetString(OidcConstants.Discovery.TokenEndpoint);
public string? UserInfoEndpoint => TryGetString(OidcConstants.Discovery.UserInfoEndpoint);
public string? IntrospectionEndpoint => TryGetString(OidcConstants.Discovery.IntrospectionEndpoint);
public string? RevocationEndpoint => TryGetString(OidcConstants.Discovery.RevocationEndpoint);
public string? DeviceAuthorizationEndpoint => TryGetString(OidcConstants.Discovery.DeviceAuthorizationEndpoint);
public string? BackchannelAuthenticationEndpoint => TryGetString(OidcConstants.Discovery.BackchannelAuthenticationEndpoint);
public string? JwksUri => TryGetString(OidcConstants.Discovery.JwksUri);
public string? EndSessionEndpoint => TryGetString(OidcConstants.Discovery.EndSessionEndpoint);
public string? CheckSessionIframe => TryGetString(OidcConstants.Discovery.CheckSessionIframe);
public string? RegistrationEndpoint => TryGetString(OidcConstants.Discovery.RegistrationEndpoint);
public string? PushedAuthorizationRequestEndpoint => TryGetString(OidcConstants.Discovery.PushedAuthorizationRequestEndpoint);
public bool? FrontChannelLogoutSupported => TryGetBoolean(OidcConstants.Discovery.FrontChannelLogoutSupported);
public bool? FrontChannelLogoutSessionSupported => TryGetBoolean(OidcConstants.Discovery.FrontChannelLogoutSessionSupported);
public IEnumerable<string> GrantTypesSupported => TryGetStringArray(OidcConstants.Discovery.GrantTypesSupported);
public IEnumerable<string> CodeChallengeMethodsSupported => TryGetStringArray(OidcConstants.Discovery.CodeChallengeMethodsSupported);
public IEnumerable<string> ScopesSupported => TryGetStringArray(OidcConstants.Discovery.ScopesSupported);
public IEnumerable<string> SubjectTypesSupported => TryGetStringArray(OidcConstants.Discovery.SubjectTypesSupported);
public IEnumerable<string> ResponseModesSupported => TryGetStringArray(OidcConstants.Discovery.ResponseModesSupported);
public IEnumerable<string> ResponseTypesSupported => TryGetStringArray(OidcConstants.Discovery.ResponseTypesSupported);
public IEnumerable<string> ClaimsSupported => TryGetStringArray(OidcConstants.Discovery.ClaimsSupported);
public IEnumerable<string> TokenEndpointAuthenticationMethodsSupported => TryGetStringArray(OidcConstants.Discovery.TokenEndpointAuthenticationMethodsSupported);
public IEnumerable<string> BackchannelTokenDeliveryModesSupported => TryGetStringArray(OidcConstants.Discovery.BackchannelTokenDeliveryModesSupported);
public bool? BackchannelUserCodeParameterSupported => TryGetBoolean(OidcConstants.Discovery.BackchannelUserCodeParameterSupported);
public bool? RequirePushedAuthorizationRequests => TryGetBoolean(OidcConstants.Discovery.RequirePushedAuthorizationRequests);
// generic
public JsonElement? TryGetValue(string name) => Json?.TryGetValue(name);
public string? TryGetString(string name) => Json?.TryGetString(name);
public bool? TryGetBoolean(string name) => Json?.TryGetBoolean(name);
public IEnumerable<string> TryGetStringArray(string name) => Json?.TryGetStringArray(name) ?? Array.Empty<string>();
private string Validate(DiscoveryPolicy policy)
{
if (policy.ValidateIssuerName)
{
IAuthorityValidationStrategy strategy = policy.AuthorityValidationStrategy ?? DiscoveryPolicy.DefaultAuthorityValidationStrategy;
AuthorityValidationResult issuerValidationResult = strategy.IsIssuerNameValid(Issuer!, policy.Authority);
if (!issuerValidationResult.Success)
{
return issuerValidationResult.ErrorMessage;
}
}
var error = ValidateEndpoints(Json, policy);
if (error.IsPresent())
{
return error;
}
return string.Empty;
}
/// <summary>
/// Checks if the issuer matches the authority.
/// </summary>
/// <param name="issuer">The issuer.</param>
/// <param name="authority">The authority.</param>
/// <returns></returns>
public bool ValidateIssuerName(string issuer, string authority)
{
return DiscoveryPolicy.DefaultAuthorityValidationStrategy.IsIssuerNameValid(issuer, authority).Success;
}
/// <summary>
/// Checks if the issuer matches the authority.
/// </summary>
/// <param name="issuer">The issuer.</param>
/// <param name="authority">The authority.</param>
/// <param name="nameComparison">The comparison mechanism that should be used when performing the match.</param>
/// <returns></returns>
public bool ValidateIssuerName(string issuer, string authority, StringComparison nameComparison)
{
return new StringComparisonAuthorityValidationStrategy(nameComparison).IsIssuerNameValid(issuer, authority).Success;
}
/// <summary>
/// Checks if the issuer matches the authority.
/// </summary>
/// <param name="issuer">The issuer.</param>
/// <param name="authority">The authority.</param>
/// <param name="validationStrategy">The strategy to use.</param>
/// <returns></returns>
private bool ValidateIssuerName(string issuer, string authority, IAuthorityValidationStrategy validationStrategy)
{
return validationStrategy.IsIssuerNameValid(issuer, authority).Success;
}
/// <summary>
/// Validates the endoints and jwks_uri according to the security policy.
/// </summary>
/// <param name="json">The json.</param>
/// <param name="policy">The policy.</param>
/// <returns></returns>
public string ValidateEndpoints(JsonElement? json, DiscoveryPolicy policy)
{
if(json == null)
{
throw new ArgumentNullException(nameof(json));
}
// allowed hosts
var allowedHosts = new HashSet<string>(policy.AdditionalEndpointBaseAddresses.Select(e => new Uri(e).Authority))
{
new Uri(policy.Authority).Authority
};
// allowed authorities (hosts + base address)
var allowedAuthorities = new HashSet<string>(policy.AdditionalEndpointBaseAddresses)
{
policy.Authority
};
// Can't actually be null, because we check that and throw at the beginning of the method
foreach (var element in json?.EnumerateObject()!)
{
if (element.Name.EndsWith("endpoint", StringComparison.OrdinalIgnoreCase) ||
element.Name.Equals(OidcConstants.Discovery.JwksUri, StringComparison.OrdinalIgnoreCase) ||
element.Name.Equals(OidcConstants.Discovery.CheckSessionIframe, StringComparison.OrdinalIgnoreCase))
{
var endpoint = element.Value.ToString();
var isValidUri = Uri.TryCreate(endpoint, UriKind.Absolute, out var uri);
if (!isValidUri)
{
return $"Malformed endpoint: {endpoint}";
}
if (!DiscoveryEndpoint.IsValidScheme(uri!))
{
return $"Malformed endpoint: {endpoint}";
}
if (!DiscoveryEndpoint.IsSecureScheme(uri!, policy))
{
return $"Endpoint does not use HTTPS: {endpoint}";
}
if (policy.ValidateEndpoints)
{
// if endpoint is on exclude list, don't validate
if (policy.EndpointValidationExcludeList.Contains(element.Name))
{
continue;
}
bool isAllowed = false;
foreach (var host in allowedHosts)
{
if (string.Equals(host, uri!.Authority))
{
isAllowed = true;
}
}
if (!isAllowed)
{
return $"Endpoint is on a different host than authority: {endpoint}";
}
IAuthorityValidationStrategy strategy = policy.AuthorityValidationStrategy ?? DiscoveryPolicy.DefaultAuthorityValidationStrategy;
AuthorityValidationResult endpointValidationResult = strategy.IsEndpointValid(endpoint, allowedAuthorities);
if (!endpointValidationResult.Success)
{
return endpointValidationResult.ErrorMessage;
}
}
}
}
if (policy.RequireKeySet)
{
if (string.IsNullOrWhiteSpace(JwksUri))
{
return "Keyset is missing";
}
}
return string.Empty;
}
}