Revert of purge nss files and dependencies

webrtc/base/nssidentity.cc

Index: webrtc/base/nssidentity.cc
diff --git a/webrtc/base/nssidentity.cc b/webrtc/base/nssidentity.cc
new file mode 100644
index 0000000000000000000000000000000000000000..6511942a3443eab85f977d24c2a868d7df4f30f7
--- /dev/null
+++ b/webrtc/base/nssidentity.cc
@@ -0,0 +1,581 @@
+/*
+ *  Copyright 2012 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include <algorithm>
+#include <string>
+#include <vector>
+
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif  // HAVE_CONFIG_H
+
+#if HAVE_NSS_SSL_H
+
+#include "webrtc/base/nssidentity.h"
+
+#include "cert.h"
+#include "cryptohi.h"
+#include "keyhi.h"
+#include "nss.h"
+#include "pk11pub.h"
+#include "sechash.h"
+
+#include "webrtc/base/logging.h"
+#include "webrtc/base/helpers.h"
+#include "webrtc/base/nssstreamadapter.h"
+#include "webrtc/base/safe_conversions.h"
+#include "webrtc/base/stringutils.h"
+
+namespace rtc {
+
+// Certificate validity lifetime in seconds.
+static const int CERTIFICATE_LIFETIME = 60*60*24*30;  // 30 days, arbitrarily
+// Certificate validity window in seconds.
+// This is to compensate for slightly incorrect system clocks.
+static const int CERTIFICATE_WINDOW = -60*60*24;
+
+NSSKeyPair::~NSSKeyPair() {
+  if (privkey_)
+    SECKEY_DestroyPrivateKey(privkey_);
+  if (pubkey_)
+    SECKEY_DestroyPublicKey(pubkey_);
+}
+
+NSSKeyPair* NSSKeyPair::Generate(KeyType key_type) {
+  SECKEYPrivateKey* privkey = nullptr;
+  SECKEYPublicKey* pubkey = nullptr;
+  SSLKEAType ssl_kea_type;
+  if (key_type == KT_RSA) {
+    PK11RSAGenParams rsa_params;
+    rsa_params.keySizeInBits = 1024;
+    rsa_params.pe = 0x010001;  // 65537 -- a common RSA public exponent.
+
+    privkey = PK11_GenerateKeyPair(
+        NSSContext::GetSlot(), CKM_RSA_PKCS_KEY_PAIR_GEN, &rsa_params, &pubkey,
+        PR_FALSE /*permanent*/, PR_FALSE /*sensitive*/, nullptr);
+
+    ssl_kea_type = ssl_kea_rsa;
+  } else if (key_type == KT_ECDSA) {
+    unsigned char param_buf[12];  // OIDs are small
+    SECItem ecdsa_params = {siBuffer, param_buf, sizeof(param_buf)};
+    SECOidData* oid_data = SECOID_FindOIDByTag(SEC_OID_SECG_EC_SECP256R1);
+    if (!oid_data || oid_data->oid.len > sizeof(param_buf) - 2) {
+      LOG(LS_ERROR) << "oid_data incorrect: " << oid_data->oid.len;
+      return nullptr;
+    }
+    ecdsa_params.data[0] = SEC_ASN1_OBJECT_ID;
+    ecdsa_params.data[1] = oid_data->oid.len;
+    memcpy(ecdsa_params.data + 2, oid_data->oid.data, oid_data->oid.len);
+    ecdsa_params.len = oid_data->oid.len + 2;
+
+    privkey = PK11_GenerateKeyPair(
+        NSSContext::GetSlot(), CKM_EC_KEY_PAIR_GEN, &ecdsa_params, &pubkey,
+        PR_FALSE /*permanent*/, PR_FALSE /*sensitive*/, nullptr);
+
+    ssl_kea_type = ssl_kea_ecdh;
+  } else {
+    LOG(LS_ERROR) << "Key type requested not understood";
+    return nullptr;
+  }
+
+  if (!privkey) {
+    LOG(LS_ERROR) << "Couldn't generate key pair: " << PORT_GetError();
+    return nullptr;
+  }
+
+  return new NSSKeyPair(privkey, pubkey, ssl_kea_type);
+}
+
+// Just make a copy.
+NSSKeyPair* NSSKeyPair::GetReference() {
+  SECKEYPrivateKey* privkey = SECKEY_CopyPrivateKey(privkey_);
+  if (!privkey)
+    return nullptr;
+
+  SECKEYPublicKey* pubkey = SECKEY_CopyPublicKey(pubkey_);
+  if (!pubkey) {
+    SECKEY_DestroyPrivateKey(privkey);
+    return nullptr;
+  }
+
+  return new NSSKeyPair(privkey, pubkey, ssl_kea_type_);
+}
+
+NSSCertificate::NSSCertificate(CERTCertificate* cert)
+    : certificate_(CERT_DupCertificate(cert)) {
+  ASSERT(certificate_ != nullptr);
+}
+
+static void DeleteCert(SSLCertificate* cert) {
+  delete cert;
+}
+
+NSSCertificate::NSSCertificate(CERTCertList* cert_list) {
+  // Copy the first cert into certificate_.
+  CERTCertListNode* node = CERT_LIST_HEAD(cert_list);
+  certificate_ = CERT_DupCertificate(node->cert);
+
+  // Put any remaining certificates into the chain.
+  node = CERT_LIST_NEXT(node);
+  std::vector<SSLCertificate*> certs;
+  for (; !CERT_LIST_END(node, cert_list); node = CERT_LIST_NEXT(node)) {
+    certs.push_back(new NSSCertificate(node->cert));
+  }
+
+  if (!certs.empty())
+    chain_.reset(new SSLCertChain(certs));
+
+  // The SSLCertChain constructor copies its input, so now we have to delete
+  // the originals.
+  std::for_each(certs.begin(), certs.end(), DeleteCert);
+}
+
+NSSCertificate::NSSCertificate(CERTCertificate* cert, SSLCertChain* chain)
+    : certificate_(CERT_DupCertificate(cert)) {
+  ASSERT(certificate_ != nullptr);
+  if (chain)
+    chain_.reset(chain->Copy());
+}
+
+NSSCertificate::~NSSCertificate() {
+  if (certificate_)
+    CERT_DestroyCertificate(certificate_);
+}
+
+NSSCertificate* NSSCertificate::FromPEMString(const std::string& pem_string) {
+  std::string der;
+  if (!SSLIdentity::PemToDer(kPemTypeCertificate, pem_string, &der))
+    return nullptr;
+
+  SECItem der_cert;
+  der_cert.data = reinterpret_cast<unsigned char *>(const_cast<char *>(
+      der.data()));
+  der_cert.len = checked_cast<unsigned int>(der.size());
+  CERTCertificate* cert = CERT_NewTempCertificate(
+      CERT_GetDefaultCertDB(), &der_cert, nullptr, PR_FALSE, PR_TRUE);
+
+  if (!cert)
+    return nullptr;
+
+  NSSCertificate* ret = new NSSCertificate(cert);
+  CERT_DestroyCertificate(cert);
+  return ret;
+}
+
+NSSCertificate* NSSCertificate::GetReference() const {
+  return new NSSCertificate(certificate_, chain_.get());
+}
+
+std::string NSSCertificate::ToPEMString() const {
+  return SSLIdentity::DerToPem(kPemTypeCertificate,
+                               certificate_->derCert.data,
+                               certificate_->derCert.len);
+}
+
+void NSSCertificate::ToDER(Buffer* der_buffer) const {
+  der_buffer->SetData(certificate_->derCert.data, certificate_->derCert.len);
+}
+
+static bool Certifies(CERTCertificate* parent, CERTCertificate* child) {
+  // TODO(bemasc): Identify stricter validation checks to use here.  In the
+  // context of some future identity standard, it might make sense to check
+  // the certificates' roles, expiration dates, self-signatures (if
+  // self-signed), certificate transparency logging, or many other attributes.
+  // NOTE: Future changes to this validation may reject some previously allowed
+  // certificate chains.  Users should be advised not to deploy chained
+  // certificates except in controlled environments until the validity
+  // requirements are finalized.
+
+  // Check that the parent's name is the same as the child's claimed issuer.
+  SECComparison name_status =
+      CERT_CompareName(&child->issuer, &parent->subject);
+  if (name_status != SECEqual)
+    return false;
+
+  // Extract the parent's public key, or fail if the key could not be read
+  // (e.g. certificate is corrupted).
+  SECKEYPublicKey* parent_key = CERT_ExtractPublicKey(parent);
+  if (!parent_key)
+    return false;
+
+  // Check that the parent's privkey was actually used to generate the child's
+  // signature.
+  SECStatus verified = CERT_VerifySignedDataWithPublicKey(&child->signatureWrap,
+                                                          parent_key, nullptr);
+  SECKEY_DestroyPublicKey(parent_key);
+  return verified == SECSuccess;
+}
+
+bool NSSCertificate::IsValidChain(const CERTCertList* cert_list) {
+  CERTCertListNode* child = CERT_LIST_HEAD(cert_list);
+  for (CERTCertListNode* parent = CERT_LIST_NEXT(child);
+       !CERT_LIST_END(parent, cert_list);
+       child = parent, parent = CERT_LIST_NEXT(parent)) {
+    if (!Certifies(parent->cert, child->cert))
+      return false;
+  }
+  return true;
+}
+
+bool NSSCertificate::GetDigestLength(const std::string& algorithm,
+                                     size_t* length) {
+  const SECHashObject* ho = nullptr;
+
+  if (!GetDigestObject(algorithm, &ho))
+    return false;
+
+  *length = ho->length;
+
+  return true;
+}
+
+bool NSSCertificate::GetSignatureDigestAlgorithm(std::string* algorithm) const {
+  // The function sec_DecodeSigAlg in NSS provides this mapping functionality.
+  // Unfortunately it is private, so the functionality must be duplicated here.
+  // See https://bugzilla.mozilla.org/show_bug.cgi?id=925165 .
+  SECOidTag sig_alg = SECOID_GetAlgorithmTag(&certificate_->signature);
+  switch (sig_alg) {
+    case SEC_OID_PKCS1_MD5_WITH_RSA_ENCRYPTION:
+      *algorithm = DIGEST_MD5;
+      break;
+    case SEC_OID_PKCS1_SHA1_WITH_RSA_ENCRYPTION:
+    case SEC_OID_ISO_SHA_WITH_RSA_SIGNATURE:
+    case SEC_OID_ISO_SHA1_WITH_RSA_SIGNATURE:
+    case SEC_OID_ANSIX9_DSA_SIGNATURE_WITH_SHA1_DIGEST:
+    case SEC_OID_BOGUS_DSA_SIGNATURE_WITH_SHA1_DIGEST:
+    case SEC_OID_ANSIX962_ECDSA_SHA1_SIGNATURE:
+    case SEC_OID_MISSI_DSS:
+    case SEC_OID_MISSI_KEA_DSS:
+    case SEC_OID_MISSI_KEA_DSS_OLD:
+    case SEC_OID_MISSI_DSS_OLD:
+      *algorithm = DIGEST_SHA_1;
+      break;
+    case SEC_OID_ANSIX962_ECDSA_SHA224_SIGNATURE:
+    case SEC_OID_PKCS1_SHA224_WITH_RSA_ENCRYPTION:
+    case SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA224_DIGEST:
+      *algorithm = DIGEST_SHA_224;
+      break;
+    case SEC_OID_ANSIX962_ECDSA_SHA256_SIGNATURE:
+    case SEC_OID_PKCS1_SHA256_WITH_RSA_ENCRYPTION:
+    case SEC_OID_NIST_DSA_SIGNATURE_WITH_SHA256_DIGEST:
+      *algorithm = DIGEST_SHA_256;
+      break;
+    case SEC_OID_ANSIX962_ECDSA_SHA384_SIGNATURE:
+    case SEC_OID_PKCS1_SHA384_WITH_RSA_ENCRYPTION:
+      *algorithm = DIGEST_SHA_384;
+      break;
+    case SEC_OID_ANSIX962_ECDSA_SHA512_SIGNATURE:
+    case SEC_OID_PKCS1_SHA512_WITH_RSA_ENCRYPTION:
+      *algorithm = DIGEST_SHA_512;
+      break;
+    default:
+      // Unknown algorithm.  There are several unhandled options that are less
+      // common and more complex.
+      algorithm->clear();
+      return false;
+  }
+  return true;
+}
+
+bool NSSCertificate::ComputeDigest(const std::string& algorithm,
+                                   unsigned char* digest,
+                                   size_t size,
+                                   size_t* length) const {
+  const SECHashObject* ho = nullptr;
+
+  if (!GetDigestObject(algorithm, &ho))
+    return false;
+
+  if (size < ho->length)  // Sanity check for fit
+    return false;
+
+  SECStatus rv = HASH_HashBuf(ho->type, digest,
+                              certificate_->derCert.data,
+                              certificate_->derCert.len);
+  if (rv != SECSuccess)
+    return false;
+
+  *length = ho->length;
+
+  return true;
+}
+
+bool NSSCertificate::GetChain(SSLCertChain** chain) const {
+  if (!chain_)
+    return false;
+
+  *chain = chain_->Copy();
+  return true;
+}
+
+bool NSSCertificate::Equals(const NSSCertificate* tocompare) const {
+  if (!certificate_->derCert.len)
+    return false;
+  if (!tocompare->certificate_->derCert.len)
+    return false;
+
+  if (certificate_->derCert.len != tocompare->certificate_->derCert.len)
+    return false;
+
+  return memcmp(certificate_->derCert.data,
+                tocompare->certificate_->derCert.data,
+                certificate_->derCert.len) == 0;
+}
+
+bool NSSCertificate::GetDigestObject(const std::string& algorithm,
+                                     const SECHashObject** hop) {
+  const SECHashObject* ho;
+  HASH_HashType hash_type;
+
+  if (algorithm == DIGEST_SHA_1) {
+    hash_type = HASH_AlgSHA1;
+  // HASH_AlgSHA224 is not supported in the chromium linux build system.
+#if 0
+  } else if (algorithm == DIGEST_SHA_224) {
+    hash_type = HASH_AlgSHA224;
+#endif
+  } else if (algorithm == DIGEST_SHA_256) {
+    hash_type = HASH_AlgSHA256;
+  } else if (algorithm == DIGEST_SHA_384) {
+    hash_type = HASH_AlgSHA384;
+  } else if (algorithm == DIGEST_SHA_512) {
+    hash_type = HASH_AlgSHA512;
+  } else {
+    return false;
+  }
+
+  ho = HASH_GetHashObject(hash_type);
+
+  ASSERT(ho->length >= 20);  // Can't happen
+  *hop = ho;
+
+  return true;
+}
+
+NSSIdentity::NSSIdentity(NSSKeyPair* keypair, NSSCertificate* cert)
+    : keypair_(keypair), certificate_(cert) {
+}
+
+NSSIdentity* NSSIdentity::GenerateInternal(const SSLIdentityParams& params) {
+  std::string subject_name_string = "CN=" + params.common_name;
+  CERTName* subject_name =
+      CERT_AsciiToName(const_cast<char*>(subject_name_string.c_str()));
+  NSSIdentity* identity = nullptr;
+  CERTSubjectPublicKeyInfo* spki = nullptr;
+  CERTCertificateRequest* certreq = nullptr;
+  CERTValidity* validity = nullptr;
+  CERTCertificate* certificate = nullptr;
+  NSSKeyPair* keypair = NSSKeyPair::Generate(params.key_type);
+  SECItem inner_der;
+  SECStatus rv;
+  PLArenaPool* arena;
+  SECItem signed_cert;
+  PRTime now = PR_Now();
+  PRTime not_before =
+      now + static_cast<PRTime>(params.not_before) * PR_USEC_PER_SEC;
+  PRTime not_after =
+      now + static_cast<PRTime>(params.not_after) * PR_USEC_PER_SEC;
+
+  inner_der.len = 0;
+  inner_der.data = nullptr;
+
+  if (!keypair) {
+    LOG(LS_ERROR) << "Couldn't generate key pair";
+    goto fail;
+  }
+
+  if (!subject_name) {
+    LOG(LS_ERROR) << "Couldn't convert subject name " << subject_name;
+    goto fail;
+  }
+
+  spki = SECKEY_CreateSubjectPublicKeyInfo(keypair->pubkey());
+  if (!spki) {
+    LOG(LS_ERROR) << "Couldn't create SPKI";
+    goto fail;
+  }
+
+  certreq = CERT_CreateCertificateRequest(subject_name, spki, nullptr);
+  if (!certreq) {
+    LOG(LS_ERROR) << "Couldn't create certificate signing request";
+    goto fail;
+  }
+
+  validity = CERT_CreateValidity(not_before, not_after);
+  if (!validity) {
+    LOG(LS_ERROR) << "Couldn't create validity";
+    goto fail;
+  }
+
+  unsigned long serial;
+  // Note: This serial in principle could collide, but it's unlikely
+  rv = PK11_GenerateRandom(reinterpret_cast<unsigned char *>(&serial),
+                           sizeof(serial));
+  if (rv != SECSuccess) {
+    LOG(LS_ERROR) << "Couldn't generate random serial";
+    goto fail;
+  }
+
+  certificate = CERT_CreateCertificate(serial, subject_name, validity, certreq);
+  if (!certificate) {
+    LOG(LS_ERROR) << "Couldn't create certificate";
+    goto fail;
+  }
+
+  arena = certificate->arena;
+
+  SECOidTag sec_oid;
+  if (params.key_type == KT_RSA) {
+    sec_oid = SEC_OID_PKCS1_SHA256_WITH_RSA_ENCRYPTION;
+  } else if (params.key_type == KT_ECDSA) {
+    sec_oid = SEC_OID_ANSIX962_ECDSA_SHA256_SIGNATURE;
+  } else {
+    // We should not arrive here since NSSKeyPair::Generate would have failed.
+    // Play it safe in order to accomodate code changes.
+    LOG(LS_ERROR) << "Key type requested not understood";
+    goto fail;
+  }
+
+  rv = SECOID_SetAlgorithmID(arena, &certificate->signature, sec_oid, nullptr);
+  if (rv != SECSuccess) {
+    LOG(LS_ERROR) << "Couldn't set hashing algorithm";
+    goto fail;
+  }
+
+  // Set version to X509v3.
+  *(certificate->version.data) = 2;
+  certificate->version.len = 1;
+
+  if (!SEC_ASN1EncodeItem(arena, &inner_der, certificate,
+                          SEC_ASN1_GET(CERT_CertificateTemplate))) {
+    LOG(LS_ERROR) << "Couldn't encode certificate";
+    goto fail;
+  }
+
+  rv = SEC_DerSignData(arena, &signed_cert, inner_der.data, inner_der.len,
+                       keypair->privkey(), sec_oid);
+  if (rv != SECSuccess) {
+    LOG(LS_ERROR) << "Couldn't sign certificate";
+    goto fail;
+  }
+  certificate->derCert = signed_cert;
+
+  identity = new NSSIdentity(keypair, new NSSCertificate(certificate));
+
+  goto done;
+
+ fail:
+  delete keypair;
+
+ done:
+  if (certificate) CERT_DestroyCertificate(certificate);
+  if (subject_name) CERT_DestroyName(subject_name);
+  if (spki) SECKEY_DestroySubjectPublicKeyInfo(spki);
+  if (certreq) CERT_DestroyCertificateRequest(certreq);
+  if (validity) CERT_DestroyValidity(validity);
+  return identity;
+}
+
+NSSIdentity* NSSIdentity::Generate(const std::string& common_name,
+                                   KeyType key_type) {
+  SSLIdentityParams params;
+  params.common_name = common_name;
+  params.not_before = CERTIFICATE_WINDOW;
+  params.not_after = CERTIFICATE_LIFETIME;
+  params.key_type = key_type;
+  return GenerateInternal(params);
+}
+
+NSSIdentity* NSSIdentity::GenerateForTest(const SSLIdentityParams& params) {
+  return GenerateInternal(params);
+}
+
+SSLIdentity* NSSIdentity::FromPEMStrings(const std::string& private_key,
+                                         const std::string& certificate) {
+  std::string private_key_der;
+  if (!SSLIdentity::PemToDer(
+      kPemTypeRsaPrivateKey, private_key, &private_key_der))
+    return nullptr;
+
+  SECItem private_key_item;
+  private_key_item.data = reinterpret_cast<unsigned char *>(
+      const_cast<char *>(private_key_der.c_str()));
+  private_key_item.len = checked_cast<unsigned int>(private_key_der.size());
+
+  const unsigned int key_usage = KU_KEY_ENCIPHERMENT | KU_DATA_ENCIPHERMENT |
+      KU_DIGITAL_SIGNATURE;
+
+  SECKEYPrivateKey* privkey = nullptr;
+  SECStatus rv = PK11_ImportDERPrivateKeyInfoAndReturnKey(
+      NSSContext::GetSlot(), &private_key_item, nullptr, nullptr, PR_FALSE,
+      PR_FALSE, key_usage, &privkey, nullptr);
+  if (rv != SECSuccess) {
+    LOG(LS_ERROR) << "Couldn't import private key";
+    return nullptr;
+  }
+
+  SECKEYPublicKey* pubkey = SECKEY_ConvertToPublicKey(privkey);
+  if (rv != SECSuccess) {
+    SECKEY_DestroyPrivateKey(privkey);
+    LOG(LS_ERROR) << "Couldn't convert private key to public key";
+    return nullptr;
+  }
+
+  SSLKEAType ssl_kea_type;
+  if (rtc::starts_with(private_key.c_str(),
+                       "-----BEGIN RSA PRIVATE KEY-----")) {
+    ssl_kea_type = ssl_kea_rsa;
+  } else {
+    // We might want to check more key types here.  But since we're moving to
+    // Open/BoringSSL, don't bother.  Besides, this will likely be correct for
+    // any future key type, causing a test to do more harm than good.
+    ssl_kea_type = ssl_kea_ecdh;
+  }
+
+  // Assign to a scoped_ptr so we don't leak on error.
+  scoped_ptr<NSSKeyPair> keypair(new NSSKeyPair(privkey, pubkey, ssl_kea_type));
+
+  scoped_ptr<NSSCertificate> cert(NSSCertificate::FromPEMString(certificate));
+  if (!cert) {
+    LOG(LS_ERROR) << "Couldn't parse certificate";
+    return nullptr;
+  }
+
+  // TODO(ekr@rtfm.com): Check the public key against the certificate.
+  return new NSSIdentity(keypair.release(), cert.release());
+}
+
+NSSIdentity::~NSSIdentity() {
+  LOG(LS_INFO) << "Destroying NSS identity";
+}
+
+NSSIdentity* NSSIdentity::GetReference() const {
+  NSSKeyPair* keypair = keypair_->GetReference();
+  if (!keypair)
+    return nullptr;
+
+  NSSCertificate* certificate = certificate_->GetReference();
+  if (!certificate) {
+    delete keypair;
+    return nullptr;
+  }
+
+  return new NSSIdentity(keypair, certificate);
+}
+
+
+NSSCertificate &NSSIdentity::certificate() const {
+  return *certificate_;
+}
+
+
+}  // rtc namespace
+
+#endif  // HAVE_NSS_SSL_H