Support EC certs in OriginBoundCertService and OriginBoundCertStore.

net/base/origin_bound_cert_service.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "net/base/origin_bound_cert_service.h"
 
+#include <algorithm>
 #include <limits>
 
 #include "base/compiler_specific.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
 #include "base/rand_util.h"
 #include "base/stl_util.h"
 #include "base/threading/worker_pool.h"
+#include "crypto/ec_private_key.h"
 #include "crypto/rsa_private_key.h"
 #include "net/base/net_errors.h"
 #include "net/base/origin_bound_cert_store.h"
 #include "net/base/x509_certificate.h"
 #include "net/base/x509_util.h"
 
 #if defined(USE_NSS)
 #include <private/pprthred.h>  // PR_DetachThread
 #endif
 
 namespace net {
 
 namespace {
 
 const int kKeySizeInBits = 1024;
 const int kValidityPeriodInDays = 365;
 
+bool IsSupportedCertType(uint8 type) {
+  switch(type) {
+    case CLIENT_CERT_RSA_SIGN:
+    case CLIENT_CERT_ECDSA_SIGN:
+      return true;
+    default:
+      return false;
+  }
+}
+
 }  // namespace
 
 // Represents the output and result callback of a request.
 class OriginBoundCertServiceRequest {
  public:
   OriginBoundCertServiceRequest(const CompletionCallback& callback,
+                                SSLClientCertType* type,
                                 std::string* private_key,
                                 std::string* cert)
       : callback_(callback),
+        type_(type),
         private_key_(private_key),
         cert_(cert) {
   }
 
   // Ensures that the result callback will never be made.
   void Cancel() {
     callback_.Reset();
+    type_ = NULL;
     private_key_ = NULL;
     cert_ = NULL;
   }
 
   // Copies the contents of |private_key| and |cert| to the caller's output
   // arguments and calls the callback.
   void Post(int error,
+            SSLClientCertType type,
             const std::string& private_key,
             const std::string& cert) {
     if (!callback_.is_null()) {
+      *type_ = type;
       *private_key_ = private_key;
       *cert_ = cert;
       callback_.Run(error);
     }
     delete this;
   }
 
   bool canceled() const { return callback_.is_null(); }
 
  private:
   CompletionCallback callback_;
+  SSLClientCertType* type_;
   std::string* private_key_;
   std::string* cert_;
 };
 
 // OriginBoundCertServiceWorker runs on a worker thread and takes care of the
 // blocking process of performing key generation. Deletes itself eventually
 // if Start() succeeds.
 class OriginBoundCertServiceWorker {
  public:
   OriginBoundCertServiceWorker(
       const std::string& origin,
+      SSLClientCertType type,
       OriginBoundCertService* origin_bound_cert_service)
       : origin_(origin),
+        type_(type),
         serial_number_(base::RandInt(0, std::numeric_limits<int>::max())),
         origin_loop_(MessageLoop::current()),
         origin_bound_cert_service_(origin_bound_cert_service),
         canceled_(false),
         error_(ERR_FAILED) {
   }
 
   bool Start() {
     DCHECK_EQ(MessageLoop::current(), origin_loop_);
 
     return base::WorkerPool::PostTask(
         FROM_HERE,
         NewRunnableMethod(this, &OriginBoundCertServiceWorker::Run),
         true /* task is slow */);
   }
 
   // Cancel is called from the origin loop when the OriginBoundCertService is
   // getting deleted.
   void Cancel() {
     DCHECK_EQ(MessageLoop::current(), origin_loop_);
     base::AutoLock locked(lock_);
     canceled_ = true;
   }
 
  private:
   void Run() {
     // Runs on a worker thread.
     error_ = OriginBoundCertService::GenerateCert(origin_,
+                                                  type_,
                                                   serial_number_,
                                                   &private_key_,
                                                   &cert_);
 #if defined(USE_NSS)
     // Detach the thread from NSPR.
     // Calling NSS functions attaches the thread to NSPR, which stores
     // the NSPR thread ID in thread-specific data.
     // The threads in our thread pool terminate after we have called
     // PR_Cleanup. Unless we detach them from NSPR, net_unittests gets
     // segfaults on shutdown when the threads' thread-specific data
     // destructors run.
     PR_DetachThread();
 #endif
     Finish();
   }
 
   // DoReply runs on the origin thread.
   void DoReply() {
     DCHECK_EQ(MessageLoop::current(), origin_loop_);
     {
       // We lock here because the worker thread could still be in Finished,
       // after the PostTask, but before unlocking |lock_|. If we do not lock in
       // this case, we will end up deleting a locked Lock, which can lead to
       // memory leaks or worse errors.
       base::AutoLock locked(lock_);
       if (!canceled_) {
-        origin_bound_cert_service_->HandleResult(origin_, error_,
+        origin_bound_cert_service_->HandleResult(origin_, error_, type_,
                                                  private_key_, cert_);
       }
     }
     delete this;
   }
 
   void Finish() {
     // Runs on the worker thread.
     // We assume that the origin loop outlives the OriginBoundCertService. If
     // the OriginBoundCertService is deleted, it will call Cancel on us. If it
@@ skipping 12 matching lines @@
         origin_loop_->PostTask(
             FROM_HERE,
             NewRunnableMethod(this, &OriginBoundCertServiceWorker::DoReply));
       }
     }
     if (canceled)
       delete this;
   }
 
   const std::string origin_;
+  const SSLClientCertType type_;
   // Note that serial_number_ must be initialized on a non-worker thread
   // (see documentation for OriginBoundCertService::GenerateCert).
   uint32 serial_number_;
   MessageLoop* const origin_loop_;
   OriginBoundCertService* const origin_bound_cert_service_;
 
   // lock_ protects canceled_.
   base::Lock lock_;
 
   // If canceled_ is true,
   // * origin_loop_ cannot be accessed by the worker thread,
   // * origin_bound_cert_service_ cannot be accessed by any thread.
   bool canceled_;
 
   int error_;
   std::string private_key_;
   std::string cert_;
 
   DISALLOW_COPY_AND_ASSIGN(OriginBoundCertServiceWorker);
 };
 
 // An OriginBoundCertServiceJob is a one-to-one counterpart of an
 // OriginBoundCertServiceWorker. It lives only on the OriginBoundCertService's
 // origin message loop.
 class OriginBoundCertServiceJob {
  public:
-  explicit OriginBoundCertServiceJob(OriginBoundCertServiceWorker* worker)
-      : worker_(worker) {
+  OriginBoundCertServiceJob(OriginBoundCertServiceWorker* worker,
+                            SSLClientCertType type)
+      : worker_(worker), type_(type) {
   }
 
   ~OriginBoundCertServiceJob() {
     if (worker_) {
       worker_->Cancel();
       DeleteAllCanceled();
     }
   }
 
+  SSLClientCertType type() const { return type_; }
+
   void AddRequest(OriginBoundCertServiceRequest* request) {
     requests_.push_back(request);
   }
 
   void HandleResult(int error,
+                    SSLClientCertType type,
                     const std::string& private_key,
                     const std::string& cert) {
     worker_ = NULL;
-    PostAll(error, private_key, cert);
+    PostAll(error, type, private_key, cert);
   }
 
  private:
   void PostAll(int error,
+               SSLClientCertType type,
                const std::string& private_key,
                const std::string& cert) {
     std::vector<OriginBoundCertServiceRequest*> requests;
     requests_.swap(requests);
 
     for (std::vector<OriginBoundCertServiceRequest*>::iterator
          i = requests.begin(); i != requests.end(); i++) {
-      (*i)->Post(error, private_key, cert);
+      (*i)->Post(error, type, private_key, cert);
       // Post() causes the OriginBoundCertServiceRequest to delete itself.
     }
   }
 
   void DeleteAllCanceled() {
     for (std::vector<OriginBoundCertServiceRequest*>::iterator
          i = requests_.begin(); i != requests_.end(); i++) {
       if ((*i)->canceled()) {
         delete *i;
       } else {
         LOG(DFATAL) << "OriginBoundCertServiceRequest leaked!";
       }
     }
   }
 
   std::vector<OriginBoundCertServiceRequest*> requests_;
   OriginBoundCertServiceWorker* worker_;
+  SSLClientCertType type_;
 };
 
+// static
+const char OriginBoundCertService::kEPKIPassword[] = "";
+
 OriginBoundCertService::OriginBoundCertService(
     OriginBoundCertStore* origin_bound_cert_store)
     : origin_bound_cert_store_(origin_bound_cert_store),
       requests_(0),
       cert_store_hits_(0),
       inflight_joins_(0) {}
 
 OriginBoundCertService::~OriginBoundCertService() {
   STLDeleteValues(&inflight_);
 }
 
 int OriginBoundCertService::GetOriginBoundCert(
     const std::string& origin,
+    const std::vector<uint8>& requested_types,
+    SSLClientCertType* type,
     std::string* private_key,
     std::string* cert,
     const CompletionCallback& callback,
     RequestHandle* out_req) {
   DCHECK(CalledOnValidThread());
 
-  if (callback.is_null() || !private_key || !cert || origin.empty()) {
+  if (callback.is_null() || !private_key || !cert || origin.empty() ||
+      requested_types.empty()) {
     *out_req = NULL;
     return ERR_INVALID_ARGUMENT;
   }
 
+  SSLClientCertType preferred_type = CLIENT_CERT_INVALID_TYPE;
+  for (size_t i = 0; i < requested_types.size(); ++i) {
+    if (IsSupportedCertType(requested_types[i])) {
+      preferred_type = static_cast<SSLClientCertType>(requested_types[i]);
+      break;
+    }
+  }
+  if (preferred_type == CLIENT_CERT_INVALID_TYPE) {
+    // None of the requested types are supported.
+    *out_req = NULL;
+    return ERR_CLIENT_AUTH_CERT_TYPE_UNSUPPORTED;
+  }
+
   requests_++;
 
-  // Check if an origin bound cert already exists for this origin.
+  // Check if an origin bound cert of an acceptable type already exists for this
+  // origin.
   if (origin_bound_cert_store_->GetOriginBoundCert(origin,
+                                                   type,
                                                    private_key,
                                                    cert)) {
-    cert_store_hits_++;
-    *out_req = NULL;
-    return OK;
+    if (IsSupportedCertType(*type) &&
+        std::find(requested_types.begin(), requested_types.end(), *type) !=
+        requested_types.end()) {
+      cert_store_hits_++;
+      *out_req = NULL;
+      return OK;
+    }
+    DVLOG(1) << "Cert store had cert of wrong type " << *type << " for "
+             << origin;
   }
 
   // |origin_bound_cert_store_| has no cert for this origin. See if an
   // identical request is currently in flight.
-  OriginBoundCertServiceJob* job;
+  OriginBoundCertServiceJob* job = NULL;
   std::map<std::string, OriginBoundCertServiceJob*>::const_iterator j;
   j = inflight_.find(origin);
   if (j != inflight_.end()) {
     // An identical request is in flight already. We'll just attach our
     // callback.
+    job = j->second;
+    // Check that the job is for an acceptable type of cert.
+    if (std::find(requested_types.begin(), requested_types.end(), job->type())
+        == requested_types.end()) {
+      DVLOG(1) << "Found inflight job of wrong type " << job->type()
+               << " for " << origin;
+      *out_req = NULL;
+      // If we get here, the server is asking for different types of certs in
+      // short succession.  This probably means the server is broken or
+      // misconfigured.  Since we only store one type of cert per origin, we
+      // are unable to handle this well.  Just return an error and let the first
+      // job finish.
+      return ERR_ORIGIN_BOUND_CERT_GENERATION_TYPE_MISMATCH;
+    }
     inflight_joins_++;
-    job = j->second;
   } else {
     // Need to make a new request.
     OriginBoundCertServiceWorker* worker =
-        new OriginBoundCertServiceWorker(origin, this);
-    job = new OriginBoundCertServiceJob(worker);
+        new OriginBoundCertServiceWorker(origin, preferred_type, this);
+    job = new OriginBoundCertServiceJob(worker, preferred_type);
     if (!worker->Start()) {
       delete job;
       delete worker;
       *out_req = NULL;
       // TODO(rkn): Log to the NetLog.
       LOG(ERROR) << "OriginBoundCertServiceWorker couldn't be started.";
       return ERR_INSUFFICIENT_RESOURCES;  // Just a guess.
     }
     inflight_[origin] = job;
   }
 
   OriginBoundCertServiceRequest* request =
-      new OriginBoundCertServiceRequest(callback, private_key, cert);
+      new OriginBoundCertServiceRequest(callback, type, private_key, cert);
   job->AddRequest(request);
   *out_req = request;
   return ERR_IO_PENDING;
 }
 
 // static
 int OriginBoundCertService::GenerateCert(const std::string& origin,
+                                         SSLClientCertType type,
                                          uint32 serial_number,
                                          std::string* private_key,
                                          std::string* cert) {
-  scoped_ptr<crypto::RSAPrivateKey> key(
-      crypto::RSAPrivateKey::Create(kKeySizeInBits));
-  if (!key.get()) {
-    LOG(WARNING) << "Unable to create key pair for client";
-    return ERR_KEY_GENERATION_FAILED;
-  }
   std::string der_cert;
-  if (!x509_util::CreateOriginBoundCertRSA(
-      key.get(),
-      origin,
-      serial_number,
-      base::TimeDelta::FromDays(kValidityPeriodInDays),
-      &der_cert)) {
-    LOG(WARNING) << "Unable to create x509 cert for client";
-    return ERR_ORIGIN_BOUND_CERT_GENERATION_FAILED;
+  std::vector<uint8> private_key_info;
+  switch (type) {
+    case CLIENT_CERT_RSA_SIGN: {
+      scoped_ptr<crypto::RSAPrivateKey> key(
+          crypto::RSAPrivateKey::Create(kKeySizeInBits));
+      if (!key.get()) {
+        DLOG(ERROR) << "Unable to create key pair for client";
+        return ERR_KEY_GENERATION_FAILED;
+      }
+      if (!x509_util::CreateOriginBoundCertRSA(
+          key.get(),
+          origin,
+          serial_number,
+          base::TimeDelta::FromDays(kValidityPeriodInDays),
+          &der_cert)) {
+        DLOG(ERROR) << "Unable to create x509 cert for client";
+        return ERR_ORIGIN_BOUND_CERT_GENERATION_FAILED;
+      }
+
+      if (!key->ExportPrivateKey(&private_key_info)) {
+        DLOG(ERROR) << "Unable to export private key";
+        return ERR_PRIVATE_KEY_EXPORT_FAILED;
+      }
+      break;
+    }
+    case CLIENT_CERT_ECDSA_SIGN: {
+      scoped_ptr<crypto::ECPrivateKey> key(crypto::ECPrivateKey::Create());
+      if (!key.get()) {
+        DLOG(ERROR) << "Unable to create key pair for client";
+        return ERR_KEY_GENERATION_FAILED;
+      }
+      if (!x509_util::CreateOriginBoundCertEC(
+          key.get(),
+          origin,
+          serial_number,
+          base::TimeDelta::FromDays(kValidityPeriodInDays),
+          &der_cert)) {
+        DLOG(ERROR) << "Unable to create x509 cert for client";
+        return ERR_ORIGIN_BOUND_CERT_GENERATION_FAILED;
+      }
+
+      if (!key->ExportEncryptedPrivateKey(
+          kEPKIPassword, 1, &private_key_info)) {
+        DLOG(ERROR) << "Unable to export private key";
+        return ERR_PRIVATE_KEY_EXPORT_FAILED;
+      }
+      break;
+    }
+    default:
+      NOTREACHED();
+      return ERR_INVALID_ARGUMENT;
   }
 
-  std::vector<uint8> private_key_info;
-  if (!key->ExportPrivateKey(&private_key_info)) {
-    LOG(WARNING) << "Unable to export private key";
-    return ERR_PRIVATE_KEY_EXPORT_FAILED;
-  }
   // TODO(rkn): Perhaps ExportPrivateKey should be changed to output a
   // std::string* to prevent this copying.
   std::string key_out(private_key_info.begin(), private_key_info.end());
 
   private_key->swap(key_out);
   cert->swap(der_cert);
   return OK;
 }
 
 void OriginBoundCertService::CancelRequest(RequestHandle req) {
   DCHECK(CalledOnValidThread());
   OriginBoundCertServiceRequest* request =
       reinterpret_cast<OriginBoundCertServiceRequest*>(req);
   request->Cancel();
 }
 
 // HandleResult is called by OriginBoundCertServiceWorker on the origin message
 // loop. It deletes OriginBoundCertServiceJob.
 void OriginBoundCertService::HandleResult(const std::string& origin,
-                                         int error,
-                                         const std::string& private_key,
-                                         const std::string& cert) {
+                                          int error,
+                                          SSLClientCertType type,
+                                          const std::string& private_key,
+                                          const std::string& cert) {
   DCHECK(CalledOnValidThread());
 
-  origin_bound_cert_store_->SetOriginBoundCert(origin, private_key, cert);
+  origin_bound_cert_store_->SetOriginBoundCert(origin, type, private_key, cert);
 
   std::map<std::string, OriginBoundCertServiceJob*>::iterator j;
   j = inflight_.find(origin);
   if (j == inflight_.end()) {
     NOTREACHED();
     return;
   }
   OriginBoundCertServiceJob* job = j->second;
   inflight_.erase(j);
 
-  job->HandleResult(error, private_key, cert);
+  job->HandleResult(error, type, private_key, cert);
   delete job;
 }
 
 int OriginBoundCertService::cert_count() {
   return origin_bound_cert_store_->GetCertCount();
 }
 
 }  // namespace net
 
 DISABLE_RUNNABLE_METHOD_REFCOUNT(net::OriginBoundCertServiceWorker);