RPC API dispatch, skeleton client functions, mixed-mode handlers for

local hashing with remote pkey.

1 files changed, 324 insertions, 0 deletions

diff --git a/hal_rpc.c b/hal_rpc.c
new file mode 100644
index 0000000..15f5f65
--- /dev/null
+++ b/hal_rpc.c
@@ -0,0 +1,324 @@
+/*
+ * hal_rpc.c
+ * ---------
+ * Remote procedure call public API implementation.
+ *
+ * Authors: Rob Austein
+ * Copyright (c) 2015, NORDUnet A/S All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * - Redistributions of source code must retain the above copyright notice,
+ *   this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ *
+ * - Neither the name of the NORDUnet nor the names of its contributors may
+ *   be used to endorse or promote products derived from this software
+ *   without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+ * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "rpc_internal.h"
+
+#ifndef HAL_RPC_IS_CLIENT
+#warning HAL_RPC_IS_CLIENT not set, assuming we're building for the HSM
+#define HAL_RPC_IS_CLIENT 0
+#endif
+
+/*
+ * Maybe we'll let the client configure this at runtime, later.  For
+ * now, wire in the obvious defaults: hashing is done locally,
+ * everything else is done via RPC.  For the server everything is
+ * always done locally.
+ */
+
+#if HAL_RPC_IS_CLIENT
+
+static const hal_rpc_misc_dispatch_t * const misc_dispatch = &hal_rpc_remote_misc_dispatch;
+static const hal_rpc_hash_dispatch_t * const hash_dispatch = &hal_rpc_remote_hash_dispatch;
+static const hal_rpc_pkey_dispatch_t * const pkey_dispatch = &hal_rpc_mixed_pkey_dispatch;
+
+#else
+
+static const hal_rpc_misc_dispatch_t * const misc_dispatch = &hal_rpc_local_misc_dispatch;
+static const hal_rpc_hash_dispatch_t * const hash_dispatch = &hal_rpc_local_hash_dispatch;
+static const hal_rpc_pkey_dispatch_t * const pkey_dispatch = &hal_rpc_local_pkey_dispatch;
+
+#endif
+
+const hal_rpc_hash_handle_t hal_rpc_hash_handle_none = {0};
+
+static inline int check_pkey_type(const hal_rpc_pkey_key_type_t type)
+{
+  switch (type) {
+  case HAL_RPC_PKEY_RSA_PRIVATE:
+  case HAL_RPC_PKEY_RSA_PUBLIC:
+  case HAL_RPC_PKEY_ECDSA_PRIVATE:
+  case HAL_RPC_PKEY_ECDSA_PUBLIC:
+    return 1;
+  default:
+    return 0;
+  }
+}
+
+static inline int check_pkey_flags(const hal_rpc_pkey_flags_t flags)
+{
+  return (flags &~ (HAL_RPC_PKEY_FLAG_USAGE_DIGITALSIGNATURE |
+		    HAL_RPC_PKEY_FLAG_USAGE_KEYENCIPHERMENT  |
+		    HAL_RPC_PKEY_FLAG_USAGE_DATAENCIPHERMENT)) == 0;
+}
+
+static inline int check_pkey_type_curve_flags(const hal_rpc_pkey_key_type_t type,
+					      const hal_rpc_pkey_curve_t curve,
+					      const hal_rpc_pkey_flags_t flags)
+{
+  if (!check_pkey_flags(flags))
+    return 0;
+
+  switch (type) {
+
+  case HAL_RPC_PKEY_RSA_PRIVATE:
+  case HAL_RPC_PKEY_RSA_PUBLIC:
+    return curve == HAL_RPC_PKEY_CURVE_NONE;
+
+  case HAL_RPC_PKEY_ECDSA_PRIVATE:
+  case HAL_RPC_PKEY_ECDSA_PUBLIC:
+    switch (curve) {
+    case HAL_RPC_PKEY_CURVE_ECDSA_P256:
+    case HAL_RPC_PKEY_CURVE_ECDSA_P384:
+    case HAL_RPC_PKEY_CURVE_ECDSA_P521:
+      return 1;
+    default:
+      return 0;
+    }
+
+  default:
+    return 0;
+  }
+}
+
+
+hal_error_t hal_rpc_get_random(void *buffer, const size_t length)
+{
+  if (buffer == NULL)
+    return HAL_ERROR_BAD_ARGUMENTS;
+  if (length == 0)
+    return HAL_OK;
+  return misc_dispatch->get_random(buffer, length);
+}
+
+#warning Perhaps we should be enforcing a minimum PIN length here
+
+hal_error_t hal_rpc_set_pin(const hal_rpc_user_t which,
+			    const char * const newpin, const size_t newpin_len)
+{
+  if (newpin == NULL || newpin_len == 0 || (which != HAL_RPC_USER_NORMAL && which != HAL_RPC_USER_SO))
+    return HAL_ERROR_BAD_ARGUMENTS;
+  return misc_dispatch->set_pin(which, newpin, newpin_len);
+}
+
+hal_error_t hal_rpc_login(const hal_rpc_client_handle_t client,
+			  const hal_rpc_user_t user,
+			  const char * const pin, const size_t pin_len)
+{
+  if (pin == NULL || pin_len == 0 || (user != HAL_RPC_USER_NORMAL && user != HAL_RPC_USER_SO))
+    return HAL_ERROR_BAD_ARGUMENTS;
+  return misc_dispatch->login(client, user, pin, pin_len);
+}
+
+hal_error_t hal_rpc_logout(const hal_rpc_client_handle_t client)
+{
+  return misc_dispatch->logout(client);
+}
+
+hal_error_t hal_rpc_hash_get_digest_length(const hal_rpc_hash_alg_t alg, size_t *length)
+{
+  if (length == NULL)
+    return HAL_ERROR_BAD_ARGUMENTS;
+  return hash_dispatch->get_digest_length(alg, length);
+}
+
+hal_error_t hal_rpc_hash_get_digest_algorithm_id(const hal_rpc_hash_alg_t alg,
+						 uint8_t *id, size_t *len, const size_t len_max)
+{
+  return hash_dispatch->get_digest_algorithm_id(alg, id, len, len_max);
+}
+
+hal_error_t hal_rpc_hash_get_algorithm(const hal_rpc_hash_handle_t hash, hal_rpc_hash_alg_t *alg)
+{
+  if (hash.handle == hal_rpc_hash_handle_none.handle || alg == NULL)
+    return HAL_ERROR_BAD_ARGUMENTS;
+  return hash_dispatch->get_algorithm(hash, alg);
+}
+
+hal_error_t hal_rpc_hash_initialize(const hal_rpc_client_handle_t client,
+				    const hal_rpc_session_handle_t session,
+				    hal_rpc_hash_handle_t *hash,
+				    const hal_rpc_hash_alg_t alg,
+				    const uint8_t * const key, const size_t key_len)
+{
+  if (hash == NULL)
+    return HAL_ERROR_BAD_ARGUMENTS;
+  return hash_dispatch->initialize(client, session, hash, alg, key, key_len);
+}
+
+hal_error_t hal_rpc_hash_update(const hal_rpc_hash_handle_t hash,
+				const uint8_t * data, const size_t length)
+{
+  if (hash.handle == hal_rpc_hash_handle_none.handle || data == NULL)
+    return HAL_ERROR_BAD_ARGUMENTS;
+  if (length == 0)
+    return HAL_OK;
+  return hash_dispatch->update(hash, data, length);
+}
+
+hal_error_t hal_rpc_hash_finalize(const hal_rpc_hash_handle_t hash,
+				  uint8_t *digest, const size_t length)
+{
+  if (hash.handle == hal_rpc_hash_handle_none.handle || digest == NULL || length == 0)
+    return HAL_ERROR_BAD_ARGUMENTS;
+  return hash_dispatch->finalize(hash, digest, length);
+}
+
+hal_error_t hal_rpc_pkey_load(const hal_rpc_client_handle_t client,
+			      const hal_rpc_session_handle_t session,
+			      hal_rpc_pkey_handle_t *pkey,
+			      const hal_rpc_pkey_key_type_t type,
+			      const hal_rpc_pkey_curve_t curve,
+			      const uint8_t * const name, const size_t name_len,
+			      const uint8_t * const der, const size_t der_len,
+			      const hal_rpc_pkey_flags_t flags)
+{
+  if (pkey == NULL ||
+      name == NULL || name_len == 0 ||
+      der == NULL || der_len == 0 ||
+      !check_pkey_type_curve_flags(type, curve, flags))
+    return HAL_ERROR_BAD_ARGUMENTS;
+  return pkey_dispatch->load(client, session, pkey, type, curve, name, name_len, der, der_len, flags);
+}
+
+hal_error_t hal_rpc_pkey_find(const hal_rpc_client_handle_t client,
+			      const hal_rpc_session_handle_t session,
+			      hal_rpc_pkey_handle_t *pkey,
+			      const hal_rpc_pkey_key_type_t type,
+			      const uint8_t * const name, const size_t name_len)
+{
+  if (pkey == NULL || name == NULL || name_len == 0 || !check_pkey_type(type))
+    return HAL_ERROR_BAD_ARGUMENTS;
+  return pkey_dispatch->find(client, session, pkey, type, name, name_len);
+}
+
+hal_error_t hal_rpc_pkey_generate_rsa(const hal_rpc_client_handle_t client,
+				      const hal_rpc_session_handle_t session,
+				      hal_rpc_pkey_handle_t *pkey,
+				      const uint8_t * const name, const size_t name_len,
+				      const unsigned key_len,
+				      const uint8_t * const exp, const size_t exp_len,
+				      const hal_rpc_pkey_flags_t flags)
+{
+  if (pkey == NULL || name == NULL || name_len == 0 || key_len == 0 ||
+      exp == NULL || exp_len == 0 || !check_pkey_flags(flags))
+    return HAL_ERROR_BAD_ARGUMENTS;
+  return pkey_dispatch->generate_rsa(client, session, pkey, name, name_len, key_len, exp, exp_len, flags);
+}
+
+hal_error_t hal_rpc_pkey_generate_ec(const hal_rpc_client_handle_t client,
+				     const hal_rpc_session_handle_t session,
+				     hal_rpc_pkey_handle_t *pkey,
+				     const uint8_t * const name, const size_t name_len,
+				     const hal_rpc_pkey_curve_t curve,
+				     const hal_rpc_pkey_flags_t flags)
+{
+  if (pkey == NULL || name == NULL || name_len == 0 ||
+      !check_pkey_type_curve_flags(HAL_RPC_PKEY_ECDSA_PRIVATE, curve, flags))
+    return HAL_ERROR_BAD_ARGUMENTS;
+  return pkey_dispatch->generate_ec(client, session, pkey, name, name_len, curve, flags);
+}
+
+hal_error_t hal_rpc_pkey_delete(const hal_rpc_pkey_handle_t pkey)
+{
+  return pkey_dispatch->delete(pkey);
+}
+
+hal_error_t hal_rpc_pkey_get_key_type(const hal_rpc_pkey_handle_t pkey,
+				      hal_rpc_pkey_key_type_t *type)
+{
+  if (type == NULL)
+    return HAL_ERROR_BAD_ARGUMENTS;
+  return pkey_dispatch->get_key_type(pkey, type);
+}
+
+hal_error_t hal_rpc_pkey_get_key_flags(const hal_rpc_pkey_handle_t pkey,
+				       hal_rpc_pkey_flags_t *flags)
+{
+  if (flags == NULL)
+    return HAL_ERROR_BAD_ARGUMENTS;
+  return pkey_dispatch->get_key_flags(pkey, flags);
+}
+
+size_t hal_rpc_pkey_get_public_key_len(const hal_rpc_pkey_handle_t pkey)
+{
+  return pkey_dispatch->get_public_key_len(pkey);
+}
+
+hal_error_t hal_rpc_pkey_get_public_key(const hal_rpc_pkey_handle_t pkey,
+					uint8_t *der, size_t *der_len, const size_t der_len_max)
+{
+  if (der == NULL || der_len == NULL || der_len_max == 0)
+    return HAL_ERROR_BAD_ARGUMENTS;
+  return pkey_dispatch->get_public_key(pkey, der, der_len, der_len_max);
+}
+
+hal_error_t hal_rpc_pkey_sign(const hal_rpc_session_handle_t session,
+			      const hal_rpc_pkey_handle_t pkey,
+			      const hal_rpc_hash_handle_t hash,
+			      const uint8_t * const input,  const size_t input_len,
+			      uint8_t * output, const size_t output_len)
+{
+  if (output == NULL || output_len == 0 ||
+      (hash.handle == hal_rpc_hash_handle_none.handle) == (input == NULL || input_len == 0))
+    return HAL_ERROR_BAD_ARGUMENTS;
+  return pkey_dispatch->sign(session, pkey, hash, input,  input_len, output, output_len);
+}
+
+hal_error_t hal_rpc_pkey_verify(const hal_rpc_session_handle_t session,
+				const hal_rpc_pkey_handle_t pkey,
+				const hal_rpc_hash_handle_t hash,
+				const uint8_t * const input, const size_t input_len,
+				uint8_t * output, const size_t output_len)
+{
+  if (output == NULL || output_len == 0 ||
+      (hash.handle == hal_rpc_hash_handle_none.handle) == (input == NULL || input_len == 0))
+    return HAL_ERROR_BAD_ARGUMENTS;
+  return pkey_dispatch->verify(session, pkey, hash, input, input_len, output, output_len);
+}
+
+hal_error_t hal_rpc_pkey_list(hal_rpc_pkey_key_info_t *result,
+			      unsigned *result_len,
+			      const unsigned result_max)
+{
+  if (result == NULL || result_len == NULL || result_max == 0)
+    return HAL_ERROR_BAD_ARGUMENTS;
+  return pkey_dispatch->list(result, result_len, result_max);
+}
+
+/*
+ * Local variables:
+ * indent-tabs-mode: nil
+ * End:
+ */