Add simple OAuth2.0 Client Credentials flow sample

Scenarios/Authentication/Minimal-machine-to-machine-using-JWT/Client/Client.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>net6.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <PackageReference Include="IdentityModel" Version="6.0.0" />
+      <PackageReference Include="System.ServiceModel.Duplex" Version="4.10.*" />
+      <PackageReference Include="System.ServiceModel.Federation" Version="4.10.*" />
+      <PackageReference Include="System.ServiceModel.Http" Version="4.10.*" />
+      <PackageReference Include="System.ServiceModel.NetTcp" Version="4.10.*" />
+      <PackageReference Include="System.ServiceModel.Security" Version="4.10.*" />
+    </ItemGroup>
+
+</Project>

Scenarios/Authentication/Minimal-machine-to-machine-using-JWT/Client/Connected Services/ServiceReference1/ConnectedService.json

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+{
+  "ExtendedData": {
+    "inputs": [
+      "https://localhost:7173/Service.svc?wsdl"
+    ],
+    "collectionTypes": [
+      "System.Array",
+      "System.Collections.Generic.Dictionary`2"
+    ],
+    "namespaceMappings": [
+      "*, ServiceReference1"
+    ],
+    "references": [
+      "IdentityModel, {IdentityModel, 6.0.0}",
+      "Microsoft.Bcl.AsyncInterfaces, {Microsoft.Bcl.AsyncInterfaces, 5.0.0}",
+      "Microsoft.Extensions.ObjectPool, {Microsoft.Extensions.ObjectPool, 5.0.10}",
+      "Microsoft.IdentityModel.Logging, {Microsoft.IdentityModel.Logging, 6.8.0}",
+      "Microsoft.IdentityModel.Protocols.WsTrust, {Microsoft.IdentityModel.Protocols.WsTrust, 6.8.0}",
+      "Microsoft.IdentityModel.Tokens, {Microsoft.IdentityModel.Tokens, 6.8.0}",
+      "Microsoft.IdentityModel.Tokens.Saml, {Microsoft.IdentityModel.Tokens.Saml, 6.8.0}",
+      "Microsoft.IdentityModel.Xml, {Microsoft.IdentityModel.Xml, 6.8.0}",
+      "System.Drawing.Common, {System.Drawing.Common, 5.0.0}",
+      "System.IO, {System.IO, 4.3.0}",
+      "System.Reflection.DispatchProxy, {System.Reflection.DispatchProxy, 4.7.1}",
+      "System.Runtime, {System.Runtime, 4.3.0}",
+      "System.Security.AccessControl, {System.Security.AccessControl, 5.0.0}",
+      "System.Security.Cryptography.Cng, {System.Security.Cryptography.Cng, 5.0.0}",
+      "System.Security.Cryptography.Xml, {System.Security.Cryptography.Xml, 5.0.0}",
+      "System.Security.Permissions, {System.Security.Permissions, 5.0.0}",
+      "System.Security.Principal.Windows, {System.Security.Principal.Windows, 5.0.0}",
+      "System.ServiceModel, {System.ServiceModel.Primitives, 4.10.0}",
+      "System.ServiceModel.Duplex, {System.ServiceModel.Duplex, 4.10.0}",
+      "System.ServiceModel.Federation, {System.ServiceModel.Federation, 4.10.0}",
+      "System.ServiceModel.Http, {System.ServiceModel.Http, 4.10.0}",
+      "System.ServiceModel.NetTcp, {System.ServiceModel.NetTcp, 4.10.0}",
+      "System.ServiceModel.Primitives, {System.ServiceModel.Primitives, 4.10.0}",
+      "System.ServiceModel.Security, {System.ServiceModel.Security, 4.10.0}",
+      "System.Text.Encoding, {System.Text.Encoding, 4.3.0}",
+      "System.Threading.Tasks, {System.Threading.Tasks, 4.3.0}",
+      "System.Windows.Extensions, {System.Windows.Extensions, 5.0.0}",
+      "System.Xml.ReaderWriter, {System.Xml.ReaderWriter, 4.3.0}",
+      "System.Xml.XmlDocument, {System.Xml.XmlDocument, 4.3.0}"
+    ],
+    "targetFramework": "net6.0",
+    "typeReuseMode": "All"
+  }
+}

Scenarios/Authentication/Minimal-machine-to-machine-using-JWT/Client/Connected Services/ServiceReference1/Reference.cs

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+//------------------------------------------------------------------------------
+// <auto-generated>
+//     This code was generated by a tool.
+//
+//     Changes to this file may cause incorrect behavior and will be lost if
+//     the code is regenerated.
+// </auto-generated>
+//------------------------------------------------------------------------------
+
+namespace ServiceReference1
+{
+
+
+    [System.CodeDom.Compiler.GeneratedCodeAttribute("Microsoft.Tools.ServiceModel.Svcutil", "2.1.0")]
+    [System.ServiceModel.ServiceContractAttribute(ConfigurationName="ServiceReference1.ISecuredService")]
+    public interface ISecuredService
+    {
+
+        [System.ServiceModel.OperationContractAttribute(Action="http://tempuri.org/ISecuredService/Echo", ReplyAction="http://tempuri.org/ISecuredService/EchoResponse")]
+        System.Threading.Tasks.Task<string> EchoAsync(string value);
+    }
+
+    [System.CodeDom.Compiler.GeneratedCodeAttribute("Microsoft.Tools.ServiceModel.Svcutil", "2.1.0")]
+    public interface ISecuredServiceChannel : ServiceReference1.ISecuredService, System.ServiceModel.IClientChannel
+    {
+    }
+
+    [System.Diagnostics.DebuggerStepThroughAttribute()]
+    [System.CodeDom.Compiler.GeneratedCodeAttribute("Microsoft.Tools.ServiceModel.Svcutil", "2.1.0")]
+    public partial class SecuredServiceClient : System.ServiceModel.ClientBase<ServiceReference1.ISecuredService>, ServiceReference1.ISecuredService
+    {
+
+        /// <summary>
+        /// Implement this partial method to configure the service endpoint.
+        /// </summary>
+        /// <param name="serviceEndpoint">The endpoint to configure</param>
+        /// <param name="clientCredentials">The client credentials</param>
+        static partial void ConfigureEndpoint(System.ServiceModel.Description.ServiceEndpoint serviceEndpoint, System.ServiceModel.Description.ClientCredentials clientCredentials);
+
+        public SecuredServiceClient() : 
+                base(SecuredServiceClient.GetDefaultBinding(), SecuredServiceClient.GetDefaultEndpointAddress())
+        {
+            this.Endpoint.Name = EndpointConfiguration.BasicHttpBinding_ISecuredService.ToString();
+            ConfigureEndpoint(this.Endpoint, this.ClientCredentials);
+        }
+
+        public SecuredServiceClient(EndpointConfiguration endpointConfiguration) : 
+                base(SecuredServiceClient.GetBindingForEndpoint(endpointConfiguration), SecuredServiceClient.GetEndpointAddress(endpointConfiguration))
+        {
+            this.Endpoint.Name = endpointConfiguration.ToString();
+            ConfigureEndpoint(this.Endpoint, this.ClientCredentials);
+        }
+
+        public SecuredServiceClient(EndpointConfiguration endpointConfiguration, string remoteAddress) : 
+                base(SecuredServiceClient.GetBindingForEndpoint(endpointConfiguration), new System.ServiceModel.EndpointAddress(remoteAddress))
+        {
+            this.Endpoint.Name = endpointConfiguration.ToString();
+            ConfigureEndpoint(this.Endpoint, this.ClientCredentials);
+        }
+
+        public SecuredServiceClient(EndpointConfiguration endpointConfiguration, System.ServiceModel.EndpointAddress remoteAddress) : 
+                base(SecuredServiceClient.GetBindingForEndpoint(endpointConfiguration), remoteAddress)
+        {
+            this.Endpoint.Name = endpointConfiguration.ToString();
+            ConfigureEndpoint(this.Endpoint, this.ClientCredentials);
+        }
+
+        public SecuredServiceClient(System.ServiceModel.Channels.Binding binding, System.ServiceModel.EndpointAddress remoteAddress) : 
+                base(binding, remoteAddress)
+        {
+        }
+
+        public System.Threading.Tasks.Task<string> EchoAsync(string value)
+        {
+            return base.Channel.EchoAsync(value);
+        }
+
+        public virtual System.Threading.Tasks.Task OpenAsync()
+        {
+            return System.Threading.Tasks.Task.Factory.FromAsync(((System.ServiceModel.ICommunicationObject)(this)).BeginOpen(null, null), new System.Action<System.IAsyncResult>(((System.ServiceModel.ICommunicationObject)(this)).EndOpen));
+        }
+
+        private static System.ServiceModel.Channels.Binding GetBindingForEndpoint(EndpointConfiguration endpointConfiguration)
+        {
+            if ((endpointConfiguration == EndpointConfiguration.BasicHttpBinding_ISecuredService))
+            {
+                System.ServiceModel.BasicHttpBinding result = new System.ServiceModel.BasicHttpBinding();
+                result.MaxBufferSize = int.MaxValue;
+                result.ReaderQuotas = System.Xml.XmlDictionaryReaderQuotas.Max;
+                result.MaxReceivedMessageSize = int.MaxValue;
+                result.AllowCookies = true;
+                result.Security.Mode = System.ServiceModel.BasicHttpSecurityMode.Transport;
+                return result;
+            }
+            throw new System.InvalidOperationException(string.Format("Could not find endpoint with name \'{0}\'.", endpointConfiguration));
+        }
+
+        private static System.ServiceModel.EndpointAddress GetEndpointAddress(EndpointConfiguration endpointConfiguration)
+        {
+            if ((endpointConfiguration == EndpointConfiguration.BasicHttpBinding_ISecuredService))
+            {
+                return new System.ServiceModel.EndpointAddress("https://localhost:7173/Service.svc");
+            }
+            throw new System.InvalidOperationException(string.Format("Could not find endpoint with name \'{0}\'.", endpointConfiguration));
+        }
+
+        private static System.ServiceModel.Channels.Binding GetDefaultBinding()
+        {
+            return SecuredServiceClient.GetBindingForEndpoint(EndpointConfiguration.BasicHttpBinding_ISecuredService);
+        }
+
+        private static System.ServiceModel.EndpointAddress GetDefaultEndpointAddress()
+        {
+            return SecuredServiceClient.GetEndpointAddress(EndpointConfiguration.BasicHttpBinding_ISecuredService);
+        }
+
+        public enum EndpointConfiguration
+        {
+
+            BasicHttpBinding_ISecuredService,
+        }
+    }
+}

Scenarios/Authentication/Minimal-machine-to-machine-using-JWT/Client/Program.cs

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+// See https://aka.ms/new-console-template for more information
+
+using System.Net;
+using System.ServiceModel;
+using System.ServiceModel.Channels;
+using IdentityModel.Client;
+using ServiceReference1;
+
+using HttpClient httpClient = new HttpClient();
+var discoveryDocumentResponse = await httpClient.GetDiscoveryDocumentAsync("https://demo.duendesoftware.com/.well-known/openid-configuration");
+var tokenResponse = await httpClient.RequestClientCredentialsTokenAsync(new ClientCredentialsTokenRequest
+{
+    Address = discoveryDocumentResponse.TokenEndpoint,
+    ClientId = "m2m",
+    ClientSecret = "secret",
+    Scope = "api"
+});
+
+var channelFactory = new ChannelFactory<ISecuredServiceChannel>(new BasicHttpBinding(BasicHttpSecurityMode.Transport),
+    new EndpointAddress("https://localhost:7173/Service.svc"));
+var channel = channelFactory.CreateChannel();
+
+var httpRequestProperty = new HttpRequestMessageProperty();
+httpRequestProperty.Headers[HttpRequestHeader.Authorization] = $"Bearer {tokenResponse.AccessToken}";
+var context = new OperationContext(channel);
+using var operationContextScope = new OperationContextScope(context);
+context.OutgoingMessageProperties[HttpRequestMessageProperty.Name] = httpRequestProperty;
+var response = channel.EchoAsync("Hello world");
+
+Console.WriteLine(response);
+Console.ReadKey();
+

Scenarios/Authentication/Minimal-machine-to-machine-using-JWT/Minimal-machine-to-machine-using-JWT.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Service", "Service\Service.csproj", "{15310845-1437-45AB-BCEE-4FAA9A3D3A08}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Client", "Client\Client.csproj", "{4BFBEC43-A1B1-4858-9AB1-4A039ABA3098}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{15310845-1437-45AB-BCEE-4FAA9A3D3A08}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{15310845-1437-45AB-BCEE-4FAA9A3D3A08}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{15310845-1437-45AB-BCEE-4FAA9A3D3A08}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{15310845-1437-45AB-BCEE-4FAA9A3D3A08}.Release|Any CPU.Build.0 = Release|Any CPU
+		{4BFBEC43-A1B1-4858-9AB1-4A039ABA3098}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{4BFBEC43-A1B1-4858-9AB1-4A039ABA3098}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{4BFBEC43-A1B1-4858-9AB1-4A039ABA3098}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{4BFBEC43-A1B1-4858-9AB1-4A039ABA3098}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+EndGlobal

Scenarios/Authentication/Minimal-machine-to-machine-using-JWT/README.md

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+## Minimal-machine-to-machine-using-JWT
+
+This sample shows a minimal machine to machine authentication setup using JWT. This authentication is known as [OAuth2.0 client_credentials](https://www.rfc-editor.org/rfc/rfc6749#section-1.3.4) flow. The identity provider is [the demo instance of Duende IdentityServer](https://demo.duendesoftware.com) which provides configured OAuth2.0 clients.
+
+### Service
+
+`Service` is configured to accept requests authenticated with a valid bearer `access_token` issued by the https://demo.duendesoftware.com identity provider with audience and scope valued to 'api'. The authentication is performed by the standard JwtBearer AuthenticationHandler shipped with ASP.NET Core in `Microsoft.AspNetCore.Authentication.JwtBearer` nuget package.
+
+### Client
+
+`Client` requests an `access_token` with the scope 'api' to the identity provider using its `client_id` and `client_secret`, then it calls the `Service` [passing its access_token in http headers](https://www.rfc-editor.org/rfc/rfc6749#section-7.1). 
+```
+Authorization: Bearer <access_token>
+```

Scenarios/Authentication/Minimal-machine-to-machine-using-JWT/Service/ISecuredService.cs

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+namespace Service;
+
+[ServiceContract]
+public interface ISecuredService
+{
+    [OperationContract]
+    string Echo(string value);
+
+}

Scenarios/Authentication/Minimal-machine-to-machine-using-JWT/Service/Program.cs

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+using Microsoft.AspNetCore.Authentication.JwtBearer;
+using Microsoft.AspNetCore.Authorization;
+
+var builder = WebApplication.CreateBuilder();
+
+builder.Services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
+    .AddJwtBearer(JwtBearerDefaults.AuthenticationScheme, options =>
+    {
+        options.Authority = "https://demo.duendesoftware.com";
+        options.Audience = "api";
+    });
+builder.Services.AddAuthorization(options =>
+{
+    options.DefaultPolicy = new AuthorizationPolicyBuilder(JwtBearerDefaults.AuthenticationScheme)
+        .RequireAuthenticatedUser()
+        .RequireClaim("scope", "api")
+        .Build();
+});
+builder.Services.AddTransient<SecuredService>();
+builder.Services.AddHttpContextAccessor();
+builder.Services.AddServiceModelServices();
+builder.Services.AddServiceModelMetadata();
+builder.Services.AddSingleton<IServiceBehavior, UseRequestHeadersForMetadataAddressBehavior>();
+
+var app = builder.Build();
+
+app.UseServiceModel(serviceBuilder =>
+{
+    serviceBuilder.AddService<SecuredService>();
+    serviceBuilder.AddServiceEndpoint<SecuredService, ISecuredService>(new BasicHttpBinding
+    {
+        Security = new BasicHttpSecurity
+        {
+            Mode = BasicHttpSecurityMode.Transport,
+            Transport = new HttpTransportSecurity
+            {
+                ClientCredentialType = HttpClientCredentialType.InheritedFromHost
+            }
+        }
+    }, "/Service.svc");
+    var serviceMetadataBehavior = app.Services.GetRequiredService<ServiceMetadataBehavior>();
+    serviceMetadataBehavior.HttpsGetEnabled = true;
+});
+
+app.Run();

Scenarios/Authentication/Minimal-machine-to-machine-using-JWT/Service/Properties/launchSettings.json

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+{
+  "profiles": {
+    "CoreWCFService": {
+      "commandName": "Project",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      },
+      "applicationUrl": "https://localhost:7173;http://localhost:5283"
+    }
+  }
+}

Scenarios/Authentication/Minimal-machine-to-machine-using-JWT/Service/SecuredService.cs

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+using CoreWCF;
+using System;
+using System.Runtime.Serialization;
+using System.Security.Claims;
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+
+namespace Service
+{
+    [Authorize]
+    public partial class SecuredService: ISecuredService
+    {
+        public string Echo(string value, [FromServices] IHttpContextAccessor httpContextAccessor, [FromServices] ILogger<SecuredService> logger)
+        {
+            var principal = httpContextAccessor.HttpContext!.User;
+            logger.LogInformation("Principal has claims: {claims}",  string.Join(", ", principal.Claims.Select(x => $"'{x.Type}'='{x.Value}'")));                
+            return value;
+        }
+    }
+}

Scenarios/Authentication/Minimal-machine-to-machine-using-JWT/Service/Service.csproj

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+<Project Sdk="Microsoft.NET.Sdk.Web">
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>true</ImplicitUsings>
+  </PropertyGroup>
+  <ItemGroup>
+    <Using Include="CoreWCF" />
+    <Using Include="CoreWCF.Configuration" />
+    <Using Include="CoreWCF.Channels" />
+    <Using Include="CoreWCF.Description" />
+    <Using Include="System.Runtime.Serialization " />
+    <Using Include="Service" />
+    <Using Include="Microsoft.Extensions.DependencyInjection.Extensions" />
+  </ItemGroup>
+  <ItemGroup>
+    <PackageReference Include="CoreWCF.Primitives" Version="1.3.1" />
+    <PackageReference Include="CoreWCF.Http" Version="1.3.1" />
+    <PackageReference Include="Microsoft.AspNetCore.Authentication.JwtBearer" Version="6.0.12" />
+    <!-- https://github.com/AzureAD/azure-activedirectory-identitymodel-extensions-for-dotnet/issues/1792#issuecomment-993393946 -->
+    <PackageReference Include="Microsoft.IdentityModel.Protocols.OpenIdConnect" Version="6.25.1" />
+  </ItemGroup>
+</Project>

Scenarios/Authentication/Minimal-machine-to-machine-using-JWT/Service/appsettings.Development.json

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+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  }
+}

Scenarios/Authentication/Minimal-machine-to-machine-using-JWT/Service/appsettings.json

@@ -0,0 +1,9 @@
+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  },
+  "AllowedHosts": "*"
+}