[webcrypto] Disable RSA key import for NSS versions less than 3.16.2.

Prior to NSS 3.16.2 there wasn't any validation of the RSA key parameters.

This has several consequences:

* Importing an RSA private key with another key's public modulus can be used to gain access to that key.
* importKey() can succeed for invalid RSA keys (invalid n, e, d, p, q etc).

This only affects Linux, since other platforms of Chromium bundle NSS/OpenSSL.

BUG=380424,378315
R=rsleevi@chromium.org

Review URL: https://codereview.chromium.org/334983006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@278803 0039d316-1c4b-4281-b951-d872f2087c98

content/child/webcrypto/platform_crypto_nss.cc

@@ -292,6 +292,50 @@ Status NssSupportsRsaOaep() {
       "later");
 }
 
+#if defined(USE_NSS) && !defined(OS_CHROMEOS)
+Status ErrorRsaKeyImportNotSupported() {
+  return Status::ErrorUnsupported(
+      "NSS version must be at least 3.16.2 for RSA key import. See "
+      "http://crbug.com/380424");
+}
+
+Status NssSupportsKeyImport(blink::WebCryptoAlgorithmId algorithm) {
+  // Prior to NSS 3.16.2 RSA key parameters were not validated. This is
+  // a security problem for RSA private key import from JWK which uses a
+  // CKA_ID based on the public modulus to retrieve the private key.
+
+  if (!IsAlgorithmRsa(algorithm))
+    return Status::Success();
+
+  if (!NSS_VersionCheck("3.16.2"))
+    return ErrorRsaKeyImportNotSupported();
+
+  // Also ensure that the version of Softoken is 3.16.2 or later.
+  crypto::ScopedPK11Slot slot(PK11_GetInternalSlot());
+  CK_SLOT_INFO info = {};
+  if (PK11_GetSlotInfo(slot.get(), &info) != SECSuccess)
+    return ErrorRsaKeyImportNotSupported();
+
+  // CK_SLOT_INFO.hardwareVersion contains the major.minor
+  // version info for Softoken in the corresponding .major/.minor
+  // fields, and .firmwareVersion contains the patch.build
+  // version info (in the .major/.minor fields)
+  if ((info.hardwareVersion.major > 3) ||
+      (info.hardwareVersion.major == 3 &&
+       (info.hardwareVersion.minor > 16 ||
+        (info.hardwareVersion.minor == 16 &&
+         info.firmwareVersion.major >= 2)))) {
+    return Status::Success();
+  }
+
+  return ErrorRsaKeyImportNotSupported();
+}
+#else
+Status NssSupportsKeyImport(blink::WebCryptoAlgorithmId) {
+  return Status::Success();
+}
+#endif
+
 // Creates a SECItem for the data in |buffer|. This does NOT make a copy, so
 // |buffer| should outlive the SECItem.
 SECItem MakeSECItemForBuffer(const CryptoData& buffer) {
@@ -987,6 +1031,10 @@ Status ImportKeySpki(const blink::WebCryptoAlgorithm& algorithm,
                      bool extractable,
                      blink::WebCryptoKeyUsageMask usage_mask,
                      blink::WebCryptoKey* key) {
+  Status status = NssSupportsKeyImport(algorithm.id());
+  if (status.IsError())
+    return status;
+
   DCHECK(key);
 
   if (!key_data.byte_length())
@@ -1016,7 +1064,7 @@ Status ImportKeySpki(const blink::WebCryptoAlgorithm& algorithm,
     return Status::ErrorUnexpected();
 
   scoped_ptr<PublicKey> key_handle;
-  Status status = PublicKey::Create(sec_public_key.Pass(), &key_handle);
+  status = PublicKey::Create(sec_public_key.Pass(), &key_handle);
   if (status.IsError())
     return status;
 
@@ -1156,6 +1204,10 @@ Status ImportKeyPkcs8(const blink::WebCryptoAlgorithm& algorithm,
                       bool extractable,
                       blink::WebCryptoKeyUsageMask usage_mask,
                       blink::WebCryptoKey* key) {
+  Status status = NssSupportsKeyImport(algorithm.id());
+  if (status.IsError())
+    return status;
+
   DCHECK(key);
 
   if (!key_data.byte_length())
@@ -1191,8 +1243,7 @@ Status ImportKeyPkcs8(const blink::WebCryptoAlgorithm& algorithm,
     return Status::ErrorUnexpected();
 
   scoped_ptr<PrivateKey> key_handle;
-  Status status =
-      PrivateKey::Create(private_key.Pass(), key_algorithm, &key_handle);
+  status = PrivateKey::Create(private_key.Pass(), key_algorithm, &key_handle);
   if (status.IsError())
     return status;
 
@@ -1689,6 +1740,10 @@ Status ImportRsaPrivateKey(const blink::WebCryptoAlgorithm& algorithm,
                            const CryptoData& exponent2,
                            const CryptoData& coefficient,
                            blink::WebCryptoKey* key) {
+  Status status = NssSupportsKeyImport(algorithm.id());
+  if (status.IsError())
+    return status;
+
   CK_OBJECT_CLASS obj_class = CKO_PRIVATE_KEY;
   CK_KEY_TYPE key_type = CKK_RSA;
   CK_BBOOL ck_false = CK_FALSE;
@@ -1770,8 +1825,7 @@ Status ImportRsaPrivateKey(const blink::WebCryptoAlgorithm& algorithm,
     return Status::ErrorUnexpected();
 
   scoped_ptr<PrivateKey> key_handle;
-  Status status =
-      PrivateKey::Create(private_key.Pass(), key_algorithm, &key_handle);
+  status = PrivateKey::Create(private_key.Pass(), key_algorithm, &key_handle);
   if (status.IsError())
     return status;
 

content/child/webcrypto/shared_crypto_unittest.cc

@@ -122,6 +122,7 @@ bool SupportsRsaOaep() {
 #if defined(USE_OPENSSL)
   return false;
 #else
+  // TODO(eroman): Exclude version test for OS_CHROMEOS
 #if defined(USE_NSS)
   if (!NSS_VersionCheck("3.16.2"))
     return false;
@@ -131,6 +132,18 @@ bool SupportsRsaOaep() {
 #endif
 }
 
+bool SupportsRsaKeyImport() {
+// TODO(eroman): Exclude version test for OS_CHROMEOS
+#if defined(USE_NSS)
+  if (!NSS_VersionCheck("3.16.2")) {
+    LOG(WARNING) << "RSA key import is not supported by this version of NSS. "
+                    "Skipping some tests";
+    return false;
+  }
+#endif
+  return true;
+}
+
 blink::WebCryptoAlgorithm CreateRsaHashedKeyGenAlgorithm(
     blink::WebCryptoAlgorithmId algorithm_id,
     const blink::WebCryptoAlgorithmId hash_id,
@@ -1503,6 +1516,9 @@ TEST_F(SharedCryptoTest, ImportJwkOctFailures) {
 }
 
 TEST_F(SharedCryptoTest, MAYBE(ImportExportJwkRsaPublicKey)) {
+  if (!SupportsRsaKeyImport())
+    return;
+
   const bool supports_rsa_oaep = SupportsRsaOaep();
   if (!supports_rsa_oaep) {
     LOG(WARNING) << "RSA-OAEP not supported on this platform. Skipping some"
@@ -1976,6 +1992,9 @@ TEST_F(SharedCryptoTest, MAYBE(ExportJwkEmptySymmetricKey)) {
 }
 
 TEST_F(SharedCryptoTest, MAYBE(ImportExportSpki)) {
+  if (!SupportsRsaKeyImport())
+    return;
+
   // Passing case: Import a valid RSA key in SPKI format.
   blink::WebCryptoKey key = blink::WebCryptoKey::createNull();
   ASSERT_EQ(Status::Success(),
@@ -2062,6 +2081,9 @@ TEST_F(SharedCryptoTest, MAYBE(ImportExportSpki)) {
 }
 
 TEST_F(SharedCryptoTest, MAYBE(ImportExportPkcs8)) {
+  if (!SupportsRsaKeyImport())
+    return;
+
   // Passing case: Import a valid RSA key in PKCS#8 format.
   blink::WebCryptoKey key = blink::WebCryptoKey::createNull();
   ASSERT_EQ(Status::Success(),
@@ -2129,6 +2151,9 @@ TEST_F(SharedCryptoTest, MAYBE(ImportExportPkcs8)) {
 //
 //   PKCS8 --> JWK --> PKCS8
 TEST_F(SharedCryptoTest, MAYBE(ImportRsaPrivateKeyJwkToPkcs8RoundTrip)) {
+  if (!SupportsRsaKeyImport())
+    return;
+
   blink::WebCryptoKey key = blink::WebCryptoKey::createNull();
   ASSERT_EQ(Status::Success(),
             ImportKey(blink::WebCryptoKeyFormatPkcs8,
@@ -2194,6 +2219,9 @@ TEST_F(SharedCryptoTest, MAYBE(ImportRsaPrivateKeyJwkToPkcs8RoundTrip)) {
 // be imported correctly, however every key after that would actually import
 // the first key.
 TEST_F(SharedCryptoTest, MAYBE(ImportMultipleRSAPrivateKeysJwk)) {
+  if (!SupportsRsaKeyImport())
+    return;
+
   scoped_ptr<base::ListValue> key_list;
   ASSERT_TRUE(ReadJsonTestFileToList("rsa_private_keys.json", &key_list));
 
@@ -2355,6 +2383,9 @@ TEST_F(SharedCryptoTest, MAYBE(ImportRsaPrivateKeyJwkMissingOptionalParams)) {
 //
 // TODO(eroman): http://crbug/com/374927
 TEST_F(SharedCryptoTest, MAYBE(ImportRsaPrivateKeyJwkIncorrectOptionalEmpty)) {
+  if (!SupportsRsaKeyImport())
+    return;
+
   blink::WebCryptoKey key = blink::WebCryptoKey::createNull();
 
   base::DictionaryValue dict;
@@ -2430,6 +2461,8 @@ TEST_F(SharedCryptoTest, MAYBE(GenerateKeyPairRsa)) {
   EXPECT_EQ(
       Status::Success(),
       ExportKey(blink::WebCryptoKeyFormatSpki, public_key, &public_key_spki));
+
+  if (SupportsRsaKeyImport()) {
     public_key = blink::WebCryptoKey::createNull();
     EXPECT_EQ(Status::Success(),
               ImportKey(blink::WebCryptoKeyFormatSpki,
@@ -2460,6 +2493,7 @@ TEST_F(SharedCryptoTest, MAYBE(GenerateKeyPairRsa)) {
                         &private_key));
     EXPECT_EQ(modulus_length,
               private_key.algorithm().rsaHashedParams()->modulusLengthBits());
+  }
 
   // Fail with bad modulus.
   algorithm =
@@ -2602,6 +2636,9 @@ TEST_F(SharedCryptoTest, MAYBE(GenerateKeyPairRsaBadExponent)) {
 }
 
 TEST_F(SharedCryptoTest, MAYBE(RsaSsaSignVerifyFailures)) {
+  if (!SupportsRsaKeyImport())
+    return;
+
   // Import a key pair.
   blink::WebCryptoAlgorithm import_algorithm =
       CreateRsaHashedImportAlgorithm(blink::WebCryptoAlgorithmIdRsaSsaPkcs1v1_5,
@@ -2732,6 +2769,9 @@ TEST_F(SharedCryptoTest, MAYBE(RsaSsaSignVerifyFailures)) {
 }
 
 TEST_F(SharedCryptoTest, MAYBE(RsaSignVerifyKnownAnswer)) {
+  if (!SupportsRsaKeyImport())
+    return;
+
   scoped_ptr<base::ListValue> tests;
   ASSERT_TRUE(ReadJsonTestFileToList("pkcs1v15_sign.json", &tests));
 
@@ -4214,6 +4254,9 @@ TEST_F(SharedCryptoTest, MAYBE(GenerateRsaSsaKeyPairIntersectUsages)) {
 // key pair (using SPKI format for public key, PKCS8 format for private key).
 // Then unwrap the wrapped key pair and verify that the key data is the same.
 TEST_F(SharedCryptoTest, MAYBE(WrapUnwrapRoundtripSpkiPkcs8UsingAesCbc)) {
+  if (!SupportsRsaKeyImport())
+    return;
+
   // Generate the wrapping key.
   blink::WebCryptoKey wrapping_key = blink::WebCryptoKey::createNull();
   ASSERT_EQ(Status::Success(),