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      1 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "net/base/keygen_handler.h"
      6 
      7 #include <string>
      8 
      9 #include "base/base64.h"
     10 #include "base/bind.h"
     11 #include "base/location.h"
     12 #include "base/logging.h"
     13 #include "base/threading/worker_pool.h"
     14 #include "base/threading/thread_restrictions.h"
     15 #include "base/synchronization/waitable_event.h"
     16 #include "build/build_config.h"
     17 #include "crypto/nss_util.h"
     18 #include "testing/gtest/include/gtest/gtest.h"
     19 
     20 #if defined(USE_NSS)
     21 #include <private/pprthred.h>  // PR_DetachThread
     22 #endif
     23 
     24 namespace net {
     25 
     26 namespace {
     27 
     28 class KeygenHandlerTest : public ::testing::Test {
     29  public:
     30   KeygenHandlerTest() {}
     31   virtual ~KeygenHandlerTest() {}
     32 
     33   virtual void SetUp() {
     34 #if defined(OS_CHROMEOS)
     35   crypto::OpenPersistentNSSDB();
     36 #endif
     37   }
     38 };
     39 
     40 // Assert that |result| is a valid output for KeygenHandler given challenge
     41 // string of |challenge|.
     42 void AssertValidSignedPublicKeyAndChallenge(const std::string& result,
     43                                             const std::string& challenge) {
     44   ASSERT_GT(result.length(), 0U);
     45 
     46   // Verify it's valid base64:
     47   std::string spkac;
     48   ASSERT_TRUE(base::Base64Decode(result, &spkac));
     49   // In lieu of actually parsing and validating the DER data,
     50   // just check that it exists and has a reasonable length.
     51   // (It's almost always 590 bytes, but the DER encoding of the random key
     52   // and signature could sometimes be a few bytes different.)
     53   ASSERT_GE(spkac.length(), 200U);
     54   ASSERT_LE(spkac.length(), 300U);
     55 
     56   // NOTE:
     57   // The value of |result| can be validated by prefixing 'SPKAC=' to it
     58   // and piping it through
     59   //   openssl spkac -verify
     60   // whose output should look like:
     61   //   Netscape SPKI:
     62   //     Public Key Algorithm: rsaEncryption
     63   //     RSA Public Key: (2048 bit)
     64   //     Modulus (2048 bit):
     65   //         00:b6:cc:14:c9:43:b5:2d:51:65:7e:11:8b:80:9e: .....
     66   //     Exponent: 65537 (0x10001)
     67   //     Challenge String: some challenge
     68   //     Signature Algorithm: md5WithRSAEncryption
     69   //         92:f3:cc:ff:0b:d3:d0:4a:3a:4c:ba:ff:d6:38:7f:a5:4b:b5: .....
     70   //   Signature OK
     71   //
     72   // The value of |spkac| can be ASN.1-parsed with:
     73   //    openssl asn1parse -inform DER
     74 }
     75 
     76 TEST_F(KeygenHandlerTest, SmokeTest) {
     77   KeygenHandler handler(768, "some challenge", GURL("http://www.example.com"));
     78   handler.set_stores_key(false);  // Don't leave the key-pair behind
     79   std::string result = handler.GenKeyAndSignChallenge();
     80   VLOG(1) << "KeygenHandler produced: " << result;
     81   AssertValidSignedPublicKeyAndChallenge(result, "some challenge");
     82 }
     83 
     84 void ConcurrencyTestCallback(base::WaitableEvent* event,
     85                              const std::string& challenge,
     86                              std::string* result) {
     87   // We allow Singleton use on the worker thread here since we use a
     88   // WaitableEvent to synchronize, so it's safe.
     89   base::ThreadRestrictions::ScopedAllowSingleton scoped_allow_singleton;
     90   KeygenHandler handler(768, challenge, GURL("http://www.example.com"));
     91   handler.set_stores_key(false);  // Don't leave the key-pair behind.
     92   *result = handler.GenKeyAndSignChallenge();
     93   event->Signal();
     94 #if defined(USE_NSS)
     95   // Detach the thread from NSPR.
     96   // Calling NSS functions attaches the thread to NSPR, which stores
     97   // the NSPR thread ID in thread-specific data.
     98   // The threads in our thread pool terminate after we have called
     99   // PR_Cleanup.  Unless we detach them from NSPR, net_unittests gets
    100   // segfaults on shutdown when the threads' thread-specific data
    101   // destructors run.
    102   PR_DetachThread();
    103 #endif
    104 }
    105 
    106 // We asynchronously generate the keys so as not to hang up the IO thread. This
    107 // test tries to catch concurrency problems in the keygen implementation.
    108 TEST_F(KeygenHandlerTest, ConcurrencyTest) {
    109   const int NUM_HANDLERS = 5;
    110   base::WaitableEvent* events[NUM_HANDLERS] = { NULL };
    111   std::string results[NUM_HANDLERS];
    112   for (int i = 0; i < NUM_HANDLERS; i++) {
    113     events[i] = new base::WaitableEvent(false, false);
    114     base::WorkerPool::PostTask(
    115         FROM_HERE,
    116         base::Bind(ConcurrencyTestCallback, events[i], "some challenge",
    117                    &results[i]),
    118         true);
    119   }
    120 
    121   for (int i = 0; i < NUM_HANDLERS; i++) {
    122     // Make sure the job completed
    123     events[i]->Wait();
    124     delete events[i];
    125     events[i] = NULL;
    126 
    127     VLOG(1) << "KeygenHandler " << i << " produced: " << results[i];
    128     AssertValidSignedPublicKeyAndChallenge(results[i], "some challenge");
    129   }
    130 }
    131 
    132 }  // namespace
    133 
    134 }  // namespace net
    135