net: remove DNS certificate checking code.

net/socket/dns_cert_provenance_checker.cc

Index: net/socket/dns_cert_provenance_checker.cc
diff --git a/net/socket/dns_cert_provenance_checker.cc b/net/socket/dns_cert_provenance_checker.cc
deleted file mode 100644
index b05a38260eb6b0e83996229d1377502603d14f76..0000000000000000000000000000000000000000
--- a/net/socket/dns_cert_provenance_checker.cc
+++ /dev/null
@@ -1,364 +0,0 @@
-// 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/socket/dns_cert_provenance_checker.h"
-
-#if !defined(USE_OPENSSL)
-
-#include <nspr.h>
-
-#include <hasht.h>
-#include <keyhi.h>
-#include <pk11pub.h>
-#include <sechash.h>
-
-#include <set>
-#include <string>
-
-#include "base/base64.h"
-#include "base/basictypes.h"
-#include "base/bind.h"
-#include "base/lazy_instance.h"
-#include "base/memory/scoped_ptr.h"
-#include "base/pickle.h"
-#include "base/threading/non_thread_safe.h"
-#include "crypto/encryptor.h"
-#include "crypto/symmetric_key.h"
-#include "net/base/completion_callback.h"
-#include "net/base/dns_util.h"
-#include "net/base/dnsrr_resolver.h"
-#include "net/base/net_errors.h"
-#include "net/base/net_log.h"
-
-namespace net {
-
-namespace {
-
-// A DER encoded SubjectPublicKeyInfo structure containing the server's public
-// key.
-const uint8 kServerPublicKey[] = {
-  0x30, 0x59, 0x30, 0x13, 0x06, 0x07, 0x2a, 0x86, 0x48, 0xce, 0x3d, 0x02, 0x01,
-  0x06, 0x08, 0x2a, 0x86, 0x48, 0xce, 0x3d, 0x03, 0x01, 0x07, 0x03, 0x42, 0x00,
-  0x04, 0xc7, 0xea, 0x88, 0x60, 0x52, 0xe3, 0xa3, 0x3e, 0x39, 0x92, 0x0f, 0xa4,
-  0x3d, 0xba, 0xd8, 0x02, 0x2d, 0x06, 0x4d, 0x64, 0x98, 0x66, 0xb4, 0x82, 0xf0,
-  0x23, 0xa6, 0xd8, 0x37, 0x55, 0x7c, 0x01, 0xbf, 0x18, 0xd8, 0x16, 0x9e, 0x66,
-  0xdc, 0x49, 0xbf, 0x2e, 0x86, 0xe3, 0x99, 0xbd, 0xb3, 0x75, 0x25, 0x61, 0x04,
-  0x6c, 0x2e, 0xfb, 0x32, 0x42, 0x27, 0xe4, 0x23, 0xea, 0xcd, 0x81, 0x62, 0xc1,
-};
-
-const unsigned kMaxUploadsPerSession = 10;
-
-// DnsCertLimits is a singleton class which keeps track of which hosts we have
-// uploaded reports for in this session. Since some users will be behind MITM
-// proxies, they would otherwise upload for every host and we don't wish to
-// spam the upload server.
-class DnsCertLimits {
- public:
-  DnsCertLimits() { }
-
-  // HaveReachedMaxUploads returns true iff we have uploaded the maximum number
-  // of DNS certificate reports for this session.
-  bool HaveReachedMaxUploads() {
-    return uploaded_hostnames_.size() >= kMaxUploadsPerSession;
-  }
-
-  // HaveReachedMaxUploads returns true iff we have already uploaded a report
-  // about the given hostname in this session.
-  bool HaveUploadedForHostname(const std::string& hostname) {
-    return uploaded_hostnames_.count(hostname) > 0;
-  }
-
-  void DidUpload(const std::string& hostname) {
-    uploaded_hostnames_.insert(hostname);
-  }
-
- private:
-  friend struct base::DefaultLazyInstanceTraits<DnsCertLimits>;
-
-  std::set<std::string> uploaded_hostnames_;
-
-  DISALLOW_COPY_AND_ASSIGN(DnsCertLimits);
-};
-
-static base::LazyInstance<DnsCertLimits> g_dns_cert_limits =
-    LAZY_INSTANCE_INITIALIZER;
-
-// DnsCertProvenanceCheck performs the DNS lookup of the certificate. This
-// class is self-deleting.
-class DnsCertProvenanceCheck : public base::NonThreadSafe {
- public:
-  DnsCertProvenanceCheck(
-      const std::string& hostname,
-      DnsRRResolver* dnsrr_resolver,
-      DnsCertProvenanceChecker::Delegate* delegate,
-      const std::vector<base::StringPiece>& der_certs)
-      : hostname_(hostname),
-        dnsrr_resolver_(dnsrr_resolver),
-        delegate_(delegate),
-        der_certs_(der_certs.size()),
-        handle_(DnsRRResolver::kInvalidHandle) {
-    for (size_t i = 0; i < der_certs.size(); i++)
-      der_certs_[i] = der_certs[i].as_string();
-  }
-
-  void Start() {
-    DCHECK(CalledOnValidThread());
-
-    if (der_certs_.empty())
-      return;
-
-    DnsCertLimits* const limits = g_dns_cert_limits.Pointer();
-    if (limits->HaveReachedMaxUploads() ||
-        limits->HaveUploadedForHostname(hostname_)) {
-      return;
-    }
-
-    uint8 fingerprint[SHA1_LENGTH];
-    SECStatus rv = HASH_HashBuf(
-        HASH_AlgSHA1, fingerprint, (uint8*) der_certs_[0].data(),
-        der_certs_[0].size());
-    DCHECK_EQ(SECSuccess, rv);
-    char fingerprint_hex[SHA1_LENGTH * 2 + 1];
-    for (unsigned i = 0; i < sizeof(fingerprint); i++) {
-      static const char hextable[] = "0123456789abcdef";
-      fingerprint_hex[i*2] = hextable[fingerprint[i] >> 4];
-      fingerprint_hex[i*2 + 1] = hextable[fingerprint[i] & 15];
-    }
-    fingerprint_hex[SHA1_LENGTH * 2] = 0;
-
-    static const char kBaseCertName[] = ".certs.googlednstest.com";
-    domain_.assign(fingerprint_hex);
-    domain_.append(kBaseCertName);
-
-    handle_ = dnsrr_resolver_->Resolve(
-        domain_, kDNS_TXT, 0 /* flags */,
-        base::Bind(&DnsCertProvenanceCheck::ResolutionComplete,
-                   base::Unretained(this)),
-        &response_, 0 /* priority */, BoundNetLog());
-    if (handle_ == DnsRRResolver::kInvalidHandle) {
-      LOG(ERROR) << "Failed to resolve " << domain_ << " for " << hostname_;
-      delete this;
-    }
-  }
-
- private:
-  void ResolutionComplete(int status) {
-    DCHECK(CalledOnValidThread());
-
-    if (status == ERR_NAME_NOT_RESOLVED ||
-        (status == OK && response_.rrdatas.empty())) {
-      LOG(ERROR) << "FAILED"
-                 << " hostname:" << hostname_
-                 << " domain:" << domain_;
-      g_dns_cert_limits.Get().DidUpload(hostname_);
-      LogCertificates(der_certs_);
-      delegate_->OnDnsCertLookupFailed(hostname_, der_certs_);
-    } else if (status == OK) {
-      LOG(ERROR) << "GOOD"
-                 << " hostname:" << hostname_
-                 << " resp:" << response_.rrdatas[0];
-    } else {
-      LOG(ERROR) << "Unknown error " << status << " for " << domain_;
-    }
-
-    delete this;
-  }
-
-  // LogCertificates writes a certificate chain, in PEM format, to LOG(ERROR).
-  static void LogCertificates(
-      const std::vector<std::string>& der_certs) {
-    std::string dump;
-    bool first = true;
-
-    for (std::vector<std::string>::const_iterator
-         i = der_certs.begin(); i != der_certs.end(); i++) {
-      if (!first)
-        dump += "\n";
-      first = false;
-
-      dump += "-----BEGIN CERTIFICATE-----\n";
-      std::string b64_encoded;
-      base::Base64Encode(*i, &b64_encoded);
-      for (size_t i = 0; i < b64_encoded.size();) {
-        size_t todo = b64_encoded.size() - i;
-        if (todo > 64)
-          todo = 64;
-        dump += b64_encoded.substr(i, todo);
-        dump += "\n";
-        i += todo;
-      }
-      dump += "-----END CERTIFICATE-----";
-    }
-
-    LOG(ERROR) << "Offending certificates:\n" << dump;
-  }
-
-  const std::string hostname_;
-  std::string domain_;
-  DnsRRResolver* dnsrr_resolver_;
-  DnsCertProvenanceChecker::Delegate* const delegate_;
-  std::vector<std::string> der_certs_;
-  RRResponse response_;
-  DnsRRResolver::Handle handle_;
-};
-
-SECKEYPublicKey* GetServerPubKey() {
-  SECItem der;
-  memset(&der, 0, sizeof(der));
-  der.data = const_cast<uint8*>(kServerPublicKey);
-  der.len = sizeof(kServerPublicKey);
-
-  CERTSubjectPublicKeyInfo* spki = SECKEY_DecodeDERSubjectPublicKeyInfo(&der);
-  SECKEYPublicKey* public_key = SECKEY_ExtractPublicKey(spki);
-  SECKEY_DestroySubjectPublicKeyInfo(spki);
-
-  return public_key;
-}
-
-}  // namespace
-
-DnsCertProvenanceChecker::Delegate::~Delegate() {
-}
-
-DnsCertProvenanceChecker::~DnsCertProvenanceChecker() {
-}
-
-void DnsCertProvenanceChecker::DoAsyncLookup(
-    const std::string& hostname,
-    const std::vector<base::StringPiece>& der_certs,
-    DnsRRResolver* dnsrr_resolver,
-    Delegate* delegate) {
-  DnsCertProvenanceCheck* check = new DnsCertProvenanceCheck(
-      hostname, dnsrr_resolver, delegate, der_certs);
-  check->Start();
-}
-
-// static
-std::string DnsCertProvenanceChecker::BuildEncryptedReport(
-    const std::string& hostname,
-    const std::vector<std::string>& der_certs) {
-  static const int kVersion = 0;
-  static const unsigned kKeySizeInBytes = 16;  // AES-128
-  static const unsigned kIVSizeInBytes = 16;  // AES's block size
-  static const unsigned kPadSize = 4096; // we pad up to 4KB,
-  // This is a DER encoded, ANSI X9.62 CurveParams object which simply
-  // specifies P256.
-  static const uint8 kANSIX962CurveParams[] = {
-    0x06, 0x08, 0x2a, 0x86, 0x48, 0xce, 0x3d, 0x03, 0x01, 0x07
-  };
-
-  Pickle p;
-  p.WriteString(hostname);
-  p.WriteInt(der_certs.size());
-  for (std::vector<std::string>::const_iterator
-       i = der_certs.begin(); i != der_certs.end(); i++) {
-    p.WriteString(*i);
-  }
-  // We pad to eliminate the possibility that someone could see the size of
-  // an upload and use that information to reduce the anonymity set of the
-  // certificate chain.
-  // The "2*sizeof(uint32)" here covers the padding length which we add next
-  // and Pickle's internal length which it includes at the beginning of the
-  // data.
-  unsigned pad_bytes = kPadSize - ((p.size() + 2*sizeof(uint32)) % kPadSize);
-  p.WriteUInt32(pad_bytes);
-  char* padding = new char[pad_bytes];
-  memset(padding, 0, pad_bytes);
-  p.WriteData(padding, pad_bytes);
-  delete[] padding;
-
-  // We generate a random public value and perform a DH key agreement with
-  // the server's fixed value.
-  SECKEYPublicKey* pub_key = NULL;
-  SECKEYPrivateKey* priv_key = NULL;
-  SECItem ec_der_params;
-  memset(&ec_der_params, 0, sizeof(ec_der_params));
-  ec_der_params.data = const_cast<uint8*>(kANSIX962CurveParams);
-  ec_der_params.len = sizeof(kANSIX962CurveParams);
-  priv_key = SECKEY_CreateECPrivateKey(&ec_der_params, &pub_key, NULL);
-  SECKEYPublicKey* server_pub_key = GetServerPubKey();
-
-  // This extracts the big-endian, x value of the shared point.
-  // The values of the arguments match ssl3_SendECDHClientKeyExchange in NSS
-  // 3.12.8's lib/ssl/ssl3ecc.c
-  PK11SymKey* pms = PK11_PubDeriveWithKDF(
-      priv_key, server_pub_key, PR_FALSE /* is sender */,
-      NULL /* random a */, NULL /* random b */, CKM_ECDH1_DERIVE,
-      CKM_TLS_MASTER_KEY_DERIVE_DH, CKA_DERIVE, 0 /* key size */,
-      CKD_NULL /* KDF */, NULL /* shared data */, NULL /* wincx */);
-  SECKEY_DestroyPublicKey(server_pub_key);
-  SECStatus rv = PK11_ExtractKeyValue(pms);
-  DCHECK_EQ(SECSuccess, rv);
-  SECItem* x_data = PK11_GetKeyData(pms);
-
-  // The key and IV are 128-bits and generated from a SHA256 hash of the x
-  // value.
-  char key_data[SHA256_LENGTH];
-  HASH_HashBuf(HASH_AlgSHA256, reinterpret_cast<uint8*>(key_data),
-               x_data->data, x_data->len);
-  PK11_FreeSymKey(pms);
-
-  DCHECK_GE(sizeof(key_data), kKeySizeInBytes + kIVSizeInBytes);
-  std::string raw_key(key_data, kKeySizeInBytes);
-
-  scoped_ptr<crypto::SymmetricKey> symkey(
-      crypto::SymmetricKey::Import(crypto::SymmetricKey::AES, raw_key));
-  std::string iv(key_data + kKeySizeInBytes, kIVSizeInBytes);
-
-  crypto::Encryptor encryptor;
-  bool r = encryptor.Init(symkey.get(), crypto::Encryptor::CBC, iv);
-  CHECK(r);
-
-  std::string plaintext(reinterpret_cast<const char*>(p.data()), p.size());
-  std::string ciphertext;
-  encryptor.Encrypt(plaintext, &ciphertext);
-
-  // We use another Pickle object to serialise the 'outer' wrapping of the
-  // plaintext.
-  Pickle outer;
-  outer.WriteInt(kVersion);
-
-  SECItem* pub_key_serialized = SECKEY_EncodeDERSubjectPublicKeyInfo(pub_key);
-  outer.WriteString(
-      std::string(reinterpret_cast<char*>(pub_key_serialized->data),
-                  pub_key_serialized->len));
-  SECITEM_FreeItem(pub_key_serialized, PR_TRUE);
-
-  outer.WriteString(ciphertext);
-
-  SECKEY_DestroyPublicKey(pub_key);
-  SECKEY_DestroyPrivateKey(priv_key);
-
-  return std::string(reinterpret_cast<const char*>(outer.data()),
-                     outer.size());
-}
-
-}  // namespace net
-
-#else  // USE_OPENSSL
-
-namespace net {
-
-DnsCertProvenanceChecker::Delegate::~Delegate() {
-}
-
-DnsCertProvenanceChecker::~DnsCertProvenanceChecker() {
-}
-
-void DnsCertProvenanceChecker::DoAsyncLookup(
-    const std::string& hostname,
-    const std::vector<base::StringPiece>& der_certs,
-    DnsRRResolver* dnsrr_resolver,
-    Delegate* delegate) {
-}
-
-std::string DnsCertProvenanceChecker::BuildEncryptedReport(
-    const std::string& hostname,
-    const std::vector<std::string>& der_certs) {
-  return "";
-}
-
-}  // namespace net
-
-#endif  // USE_OPENSSL