Merge pull request #19 from Altinn/feature/Add-function-GetPlatformAc…

…cessToken

Add function GetPlatformAccessToken

AltinnTestTools.sln

@@ -1,17 +1,17 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio Version 16
-VisualStudioVersion = 16.0.29920.165
+# Visual Studio Version 17
+VisualStudioVersion = 17.7.34202.233
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "TokenGenerator", "TokenGenerator\TokenGenerator.csproj", "{51860523-231F-4BCC-97E4-BF41978237ED}"
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{BD0CAC07-E747-4A89-A123-C2982D0D48AC}"
 	ProjectSection(SolutionItems) = preProject
-		.github\workflows\cd-tokengenerator.yml = .github\workflows\cd-tokengenerator.yml
+		LICENSE = LICENSE
 		README.md = README.md
 	EndProjectSection
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "TokenGeneratorCli", "TokenGeneratorCli\TokenGeneratorCli.csproj", "{6BABB466-D89B-476E-B18A-27C59819F6DE}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "TokenGeneratorCli", "TokenGeneratorCli\TokenGeneratorCli.csproj", "{6BABB466-D89B-476E-B18A-27C59819F6DE}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution

TokenGenerator/GetPlatformAccessToken.cs

@@ -0,0 +1,54 @@
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.Azure.WebJobs;
+using Microsoft.Azure.WebJobs.Extensions.Http;
+using Microsoft.AspNetCore.Http;
+using System.Threading.Tasks;
+using Microsoft.Extensions.Options;
+using TokenGenerator.Services.Interfaces;
+
+namespace TokenGenerator
+{
+    public class GetPlatformAccessToken
+    {
+        private readonly IToken tokenHelper;
+        private readonly IRequestValidator requestValidator;
+        private readonly IAuthorization authorization;
+        private readonly Settings settings;
+
+        public GetPlatformAccessToken(IToken tokenHelper, IRequestValidator requestValidator, IAuthorization authorization, IOptions<Settings> settings)
+        {
+            this.tokenHelper = tokenHelper;
+            this.requestValidator = requestValidator;
+            this.authorization = authorization;
+            this.settings = settings.Value;
+        }
+
+        [FunctionName(nameof(GetPlatformAccessToken))]
+        public async Task<ActionResult> Run([HttpTrigger(AuthorizationLevel.Anonymous, "get", Route = null)] HttpRequest req)
+        {
+            ActionResult failedAuthorizationResult = await authorization.Authorize(settings.AuthorizedScopePlatform);
+            if (failedAuthorizationResult != null)
+            {
+                return failedAuthorizationResult;
+            }
+
+            requestValidator.ValidateQueryParam("env", true, tokenHelper.IsValidEnvironment, out string env);
+            requestValidator.ValidateQueryParam("app", true, tokenHelper.IsValidDottedIdentifier, out string appClaim);
+            requestValidator.ValidateQueryParam<uint>("ttl", false, uint.TryParse, out uint ttl, 1800);
+
+            if (requestValidator.GetErrors().Count > 0)
+            {
+                 return new BadRequestObjectResult(requestValidator.GetErrors());
+            }
+
+            string token = await tokenHelper.GetPlatformAccessToken(env, appClaim, ttl);
+
+            if (!string.IsNullOrEmpty(req.Query["dump"]))
+            {
+                return new OkObjectResult(tokenHelper.Dump(token));
+            }
+
+            return new OkObjectResult(token);
+        }
+    }
+}

TokenGenerator/Services/CertificateKeyVault.cs

@@ -1,20 +1,21 @@
-using System.IO;
+using System;
+using System.Collections.Generic;
+using System.IO;
 using System.Linq;
 using System.Threading;
+using System.Threading.Tasks;
+using System.Security.Cryptography.X509Certificates;
+
+using Azure.Identity;
 using Azure.Security.KeyVault.Certificates;
 using Azure.Security.KeyVault.Secrets;
+
+using Microsoft.Extensions.Options;
+
 using TokenGenerator.Services.Interfaces;
 
 namespace TokenGenerator.Services
 {
-    using System;
-    using System.Collections.Generic;
-    using System.Security.Cryptography.X509Certificates;
-    using System.Threading.Tasks;
-    using Azure.Identity;
-
-    using Microsoft.Extensions.Options;
-
     public class CertificateKeyVault : ICertificateService
     {
         private readonly Settings settings;
@@ -55,26 +56,40 @@ public async Task<X509Certificate2> GetConsentTokenSigningCertificate(string env
             return GetLatestCertificateWithRolloverDelay(certificates, 1);
         }
 
+        public async Task<X509Certificate2> GetPlatformAccessTokenSigningCertificate(string environment)
+        {
+            if (string.IsNullOrEmpty(environment) || settings.EnvironmentsApiTokenDict[environment] == null || settings.PlatformAccessTokenSigningCertNamesDict[environment] == null)
+            {
+                throw new ArgumentException("Invalid environment");
+            }
+
+            var certificates = await GetCertificates(settings.EnvironmentsApiTokenDict[environment], settings.PlatformAccessTokenSigningCertNamesDict[environment]);
+
+            return GetLatestCertificateWithRolloverDelay(certificates, 1);
+        }
+
         private async Task<List<X509Certificate2>> GetCertificates(string keyVaultName, string certificateName)
         {
             await _semaphore.WaitAsync();
 
+            string cacheKey = string.Concat(keyVaultName, certificateName);
+
             try
             {
-                if (_certificateUpdateTime > DateTime.Now && _certificates.ContainsKey(keyVaultName) &&
-                    _certificates[keyVaultName].Count > 0)
+                if (_certificateUpdateTime > DateTime.Now && _certificates.ContainsKey(cacheKey) &&
+                    _certificates[cacheKey].Count > 0)
                 {
-                    return _certificates[keyVaultName];
+                    return _certificates[cacheKey];
                 }
 
-                _certificates[keyVaultName] = await GetAllCertificateVersions(keyVaultName, certificateName);
+                _certificates[cacheKey] = await GetAllCertificateVersions(keyVaultName, certificateName);
 
                 // Reuse the same list of certificates for 1 hour.
                 _certificateUpdateTime = DateTime.Now.AddHours(1);
 
-                _certificates[keyVaultName] =
-                    _certificates[keyVaultName].OrderByDescending(cer => cer.NotBefore).ToList();
-                return _certificates[keyVaultName];
+                _certificates[cacheKey] =
+                    _certificates[cacheKey].OrderByDescending(cer => cer.NotBefore).ToList();
+                return _certificates[cacheKey];
             }
             finally
             {

TokenGenerator/Services/CertificatePfx.cs

@@ -52,5 +52,10 @@ public async Task<X509Certificate2> GetConsentTokenSigningCertificate(string _)
 
             return await Task.FromResult(consentTokenSigningCertificate);
         }
+
+        public Task<X509Certificate2> GetPlatformAccessTokenSigningCertificate(string environment)
+        {
+            throw new NotImplementedException();
+        }
     }
 }

TokenGenerator/Services/Interfaces/ICertificateService.cs

@@ -7,5 +7,6 @@ public interface ICertificateService
     {
         Task<X509Certificate2> GetApiTokenSigningCertificate(string environment);
         Task<X509Certificate2> GetConsentTokenSigningCertificate(string environment);
+        Task<X509Certificate2> GetPlatformAccessTokenSigningCertificate(string environment);
     }
 }

TokenGenerator/Services/Interfaces/IToken.cs

@@ -11,6 +11,8 @@ public interface IToken
         Task<string> GetPersonalToken(string env, string[] scopes, uint userId, uint partyId, string pid, string authLvl, string consumerOrgNo, string userName, string clientAmr, uint ttl, string delegationSource);
         Task<string> GetConsentToken(string env, string[] serviceCodes, IQueryCollection queryParameters, Guid authorizationCode, string offeredBy, string coveredBy, string handledBy, uint ttl);
         Task<string> GetPlatformToken(string env, string appClaim, uint ttl);
+        Task<string> GetPlatformAccessToken(string env, string appClaim, uint ttl);
+
         string Dump(string token);
         bool IsValidAuthLvl(string authLvl);
         bool IsValidIdentifier(string identifier);

TokenGenerator/Services/Token.cs

@@ -1,15 +1,19 @@
-using Microsoft.Extensions.Options;
-using Microsoft.IdentityModel.Tokens;
-using Newtonsoft.Json;
-using System;
+using System;
 using System.Collections.Generic;
 using System.IdentityModel.Tokens.Jwt;
 using System.Linq;
 using System.Security.Claims;
+using System.Security.Cryptography.X509Certificates;
 using System.Text;
 using System.Text.RegularExpressions;
 using System.Threading.Tasks;
+
 using Microsoft.AspNetCore.Http;
+using Microsoft.Extensions.Options;
+using Microsoft.IdentityModel.Tokens;
+
+using Newtonsoft.Json;
+
 using TokenGenerator.Services.Interfaces;
 
 namespace TokenGenerator.Services
@@ -234,30 +238,31 @@ public async Task<string> GetConsentToken(string env, string[] serviceCodes, IQu
             return handler.WriteToken(securityToken);
         }
 
+        /// <summary>
+        /// Generates a type of AccessToken token and signing it with the same certificate as used by Authentication.
+        /// </summary>
+        /// <param name="env">The environment id.</param>
+        /// <param name="appClaim">The name of the app.</param>
+        /// <param name="ttl">Time to live.</param>
         public async Task<string> GetPlatformToken(string env, string appClaim, uint ttl)
         {
-            var dateTimeOffset = new DateTimeOffset(DateTime.UtcNow);
+            string issuer = GetIssuer(env);
             var signingCertificate = await certificateHelper.GetApiTokenSigningCertificate(env);
-            var securityKey = new X509SecurityKey(signingCertificate);
-            var header = new JwtHeader(new SigningCredentials(securityKey, SecurityAlgorithms.RsaSha256))
-            {
-               { "x5c", signingCertificate.Thumbprint }
-            };
-
-            var payload = new JwtPayload
-            {
-                { "urn:altinn:app", appClaim },
-                { "exp", dateTimeOffset.ToUnixTimeSeconds() + ttl },
-                { "iat", dateTimeOffset.ToUnixTimeSeconds() },
-                { "iss", GetIssuer(env) },
-                { "actual_iss", "altinn-test-tools" },
-                { "nbf", dateTimeOffset.ToUnixTimeSeconds() },
-            };
-
-            var securityToken = new JwtSecurityToken(header, payload);
-            var handler = new JwtSecurityTokenHandler();
+            return CreateAccessToken(appClaim, ttl, issuer, signingCertificate);
+        }
 
-            return handler.WriteToken(securityToken);
+        /// <summary>
+        /// Generates a "propper" AccessToken token and signing it with the same platform access token certificate.
+        /// </summary>
+        /// <remarks>The issuer is hard coded to <c>platform</c>. The value is used by AccessTokenHandler to identify
+        /// correct public key when validating the token signature.</remarks>
+        /// <param name="env">The environment id.</param>
+        /// <param name="appClaim">The name of the platform application.</param>
+        /// <param name="ttl">Time to live.</param>
+        public async Task<string> GetPlatformAccessToken(string env, string appClaim, uint ttl)
+        {
+            var signingCertificate = await certificateHelper.GetPlatformAccessTokenSigningCertificate(env);
+            return CreateAccessToken(appClaim, ttl, "platform", signingCertificate);
         }
 
         public bool TryParseScopes(string input, out string[] scopes)
@@ -346,6 +351,7 @@ public string Dump(string token)
         }
 
         private readonly Random random = new Random();
+
         private string RandomString(int length)
         {
             const string chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-";
@@ -363,5 +369,30 @@ private static string GetIssuer(string env)
             string tld = env.ToLowerInvariant().StartsWith("at") ? "cloud" : "no";
             return $"https://platform.{env}.altinn.{tld}/authentication/api/v1/openid/";
         }
+
+        private static string CreateAccessToken(string appClaim, uint ttl, string issuer, X509Certificate2 signingCertificate)
+        {
+            var securityKey = new X509SecurityKey(signingCertificate);
+            var header = new JwtHeader(new SigningCredentials(securityKey, SecurityAlgorithms.RsaSha256))
+            {
+               { "x5c", signingCertificate.Thumbprint }
+            };
+
+            var dateTimeOffset = new DateTimeOffset(DateTime.UtcNow);
+            var payload = new JwtPayload
+            {
+                { "urn:altinn:app", appClaim },
+                { "exp", dateTimeOffset.ToUnixTimeSeconds() + ttl },
+                { "iat", dateTimeOffset.ToUnixTimeSeconds() },
+                { "iss", issuer },
+                { "actual_iss", "altinn-test-tools" },
+                { "nbf", dateTimeOffset.ToUnixTimeSeconds() },
+            };
+
+            var securityToken = new JwtSecurityToken(header, payload);
+            var handler = new JwtSecurityTokenHandler();
+
+            return handler.WriteToken(securityToken);
+        }
     }
 }

TokenGenerator/Settings.cs

@@ -8,6 +8,8 @@ public class Settings
     {
         public string ApiTokenSigningCertNames { get; set; }
         public Dictionary<string, string> ApiTokenSigningCertNamesDict => GetKeyValuePairs(ApiTokenSigningCertNames);
+        public string PlatformAccessTokenSigningCertNames { get; set; }
+        public Dictionary<string, string> PlatformAccessTokenSigningCertNamesDict => GetKeyValuePairs(PlatformAccessTokenSigningCertNames);
         public string ConsentTokenSigningCertNames { get; set; }
         public Dictionary<string, string> ConsentTokenSigningCertNamesDict => GetKeyValuePairs(ConsentTokenSigningCertNames);
         public string BasicAuthorizationUsers { get; set; }

TokenGenerator/local.settings.json.COPYME

@@ -6,6 +6,7 @@
   },
   "Settings": {
     "ApiTokenSigningCertNames": "dev:altinn-testtools-api-token-signing-cert",
+    "PlatformAccessTokenSigningCertNames": "dev:altinn-testtools-api-token-signing-cert",
     "AuthorizedScope": "altinn:testtools/tokengenerator",
     "AuthorizedScopeEnterprise": "altinn:testtools/tokengenerator/enterprise",
     "AuthorizedScopeEnterpriseUser": "altinn:testtools/tokengenerator/enterpriseuser",