import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

media/mtransport/dtlsidentity.cpp

@@ -0,0 +1,214 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "dtlsidentity.h"
+
+#include "cert.h"
+#include "cryptohi.h"
+#include "keyhi.h"
+#include "nsError.h"
+#include "pk11pub.h"
+#include "sechash.h"
+#include "ssl.h"
+
+#include "mozilla/Sprintf.h"
+
+namespace mozilla {
+
+RefPtr<DtlsIdentity> DtlsIdentity::Generate() {
+  ScopedPK11SlotInfo slot(PK11_GetInternalSlot());
+  if (!slot) {
+    return nullptr;
+  }
+
+  uint8_t random_name[16];
+
+  SECStatus rv = PK11_GenerateRandomOnSlot(slot, random_name,
+                                           sizeof(random_name));
+  if (rv != SECSuccess)
+    return nullptr;
+
+  std::string name;
+  char chunk[3];
+  for (size_t i = 0; i < sizeof(random_name); ++i) {
+    SprintfLiteral(chunk, "%.2x", random_name[i]);
+    name += chunk;
+  }
+
+  std::string subject_name_string = "CN=" + name;
+  ScopedCERTName subject_name(CERT_AsciiToName(subject_name_string.c_str()));
+  if (!subject_name) {
+    return nullptr;
+  }
+
+  unsigned char paramBuf[12]; // OIDs are small
+  SECItem ecdsaParams = { siBuffer, paramBuf, sizeof(paramBuf) };
+  SECOidData* oidData = SECOID_FindOIDByTag(SEC_OID_SECG_EC_SECP256R1);
+  if (!oidData || (oidData->oid.len > (sizeof(paramBuf) - 2))) {
+    return nullptr;
+  }
+  ecdsaParams.data[0] = SEC_ASN1_OBJECT_ID;
+  ecdsaParams.data[1] = oidData->oid.len;
+  memcpy(ecdsaParams.data + 2, oidData->oid.data, oidData->oid.len);
+  ecdsaParams.len = oidData->oid.len + 2;
+
+  ScopedSECKEYPrivateKey private_key;
+  ScopedSECKEYPublicKey public_key;
+  SECKEYPublicKey *pubkey;
+
+  private_key =
+      PK11_GenerateKeyPair(slot,
+                           CKM_EC_KEY_PAIR_GEN, &ecdsaParams, &pubkey,
+                           PR_FALSE, PR_TRUE, nullptr);
+  if (private_key == nullptr)
+    return nullptr;
+  public_key = pubkey;
+
+  ScopedCERTSubjectPublicKeyInfo spki(
+      SECKEY_CreateSubjectPublicKeyInfo(pubkey));
+  if (!spki) {
+    return nullptr;
+  }
+
+  ScopedCERTCertificateRequest certreq(
+      CERT_CreateCertificateRequest(subject_name, spki, nullptr));
+  if (!certreq) {
+    return nullptr;
+  }
+
+  // From 1 day before todayto 30 days after.
+  // This is a sort of arbitrary range designed to be valid
+  // now with some slack in case the other side expects
+  // some before expiry.
+  //
+  // Note: explicit casts necessary to avoid
+  //       warning C4307: '*' : integral constant overflow
+  static const PRTime oneDay = PRTime(PR_USEC_PER_SEC)
+                             * PRTime(60)  // sec
+                             * PRTime(60)  // min
+                             * PRTime(24); // hours
+  PRTime now = PR_Now();
+  PRTime notBefore = now - oneDay;
+  PRTime notAfter = now + (PRTime(30) * oneDay);
+
+  ScopedCERTValidity validity(CERT_CreateValidity(notBefore, notAfter));
+  if (!validity) {
+    return nullptr;
+  }
+
+  unsigned long serial;
+  // Note: This serial in principle could collide, but it's unlikely
+  rv = PK11_GenerateRandomOnSlot(slot,
+                                 reinterpret_cast<unsigned char *>(&serial),
+                                 sizeof(serial));
+  if (rv != SECSuccess) {
+    return nullptr;
+  }
+
+  ScopedCERTCertificate certificate(
+      CERT_CreateCertificate(serial, subject_name, validity, certreq));
+  if (!certificate) {
+    return nullptr;
+  }
+
+  PLArenaPool *arena = certificate->arena;
+
+  rv = SECOID_SetAlgorithmID(arena, &certificate->signature,
+                             SEC_OID_ANSIX962_ECDSA_SHA256_SIGNATURE, 0);
+  if (rv != SECSuccess)
+    return nullptr;
+
+  // Set version to X509v3.
+  *(certificate->version.data) = SEC_CERTIFICATE_VERSION_3;
+  certificate->version.len = 1;
+
+  SECItem innerDER;
+  innerDER.len = 0;
+  innerDER.data = nullptr;
+
+  if (!SEC_ASN1EncodeItem(arena, &innerDER, certificate,
+                          SEC_ASN1_GET(CERT_CertificateTemplate))) {
+    return nullptr;
+  }
+
+  SECItem *signedCert = PORT_ArenaZNew(arena, SECItem);
+  if (!signedCert) {
+    return nullptr;
+  }
+
+  rv = SEC_DerSignData(arena, signedCert, innerDER.data, innerDER.len,
+                       private_key,
+                       SEC_OID_ANSIX962_ECDSA_SHA256_SIGNATURE);
+  if (rv != SECSuccess) {
+    return nullptr;
+  }
+  certificate->derCert = *signedCert;
+
+  RefPtr<DtlsIdentity> identity =
+      new DtlsIdentity(private_key.forget(), certificate.forget(), ssl_kea_ecdh);
+  return identity.forget();
+}
+
+const std::string DtlsIdentity::DEFAULT_HASH_ALGORITHM = "sha-256";
+
+nsresult DtlsIdentity::ComputeFingerprint(const std::string algorithm,
+                                          uint8_t *digest,
+                                          size_t size,
+                                          size_t *digest_length) const {
+  const UniqueCERTCertificate& c = cert();
+  MOZ_ASSERT(c);
+
+  return ComputeFingerprint(c, algorithm, digest, size, digest_length);
+}
+
+nsresult DtlsIdentity::ComputeFingerprint(const UniqueCERTCertificate& cert,
+                                          const std::string algorithm,
+                                          uint8_t *digest,
+                                          size_t size,
+                                          size_t *digest_length) {
+  MOZ_ASSERT(cert);
+
+  HASH_HashType ht;
+
+  if (algorithm == "sha-1") {
+    ht = HASH_AlgSHA1;
+  } else if (algorithm == "sha-224") {
+    ht = HASH_AlgSHA224;
+  } else if (algorithm == "sha-256") {
+    ht = HASH_AlgSHA256;
+  } else if (algorithm == "sha-384") {
+    ht = HASH_AlgSHA384;
+  }  else if (algorithm == "sha-512") {
+    ht = HASH_AlgSHA512;
+  } else {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  const SECHashObject *ho = HASH_GetHashObject(ht);
+  MOZ_ASSERT(ho);
+  if (!ho) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  MOZ_ASSERT(ho->length >= 20);  // Double check
+
+  if (size < ho->length) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  SECStatus rv = HASH_HashBuf(ho->type, digest,
+                              cert->derCert.data,
+                              cert->derCert.len);
+  if (rv != SECSuccess) {
+    return NS_ERROR_FAILURE;
+  }
+
+  *digest_length = ho->length;
+
+  return NS_OK;
+}
+
+}  // close namespace