Restrict duplicate keys in epee binary format

contrib/epee/include/storages/portable_storage_from_bin.h

@@ -29,6 +29,7 @@
 #pragma once 
 
 #include "misc_language.h"
+#include "misc_log_ex.h"
 #include "portable_storage_base.h"
 #include "portable_storage_bin_utils.h"
 
@@ -306,7 +307,9 @@ namespace epee
         //read section name string
         std::string sec_name;
         read_sec_name(sec_name);
-        sec.m_entries.emplace(std::move(sec_name), load_storage_entry());
+        const auto insert_loc = sec.m_entries.lower_bound(sec_name);
+        CHECK_AND_ASSERT_THROW_MES(insert_loc == sec.m_entries.end() || insert_loc->first != sec_name, "duplicate key: " << sec_name);
+        sec.m_entries.emplace_hint(insert_loc, std::move(sec_name), load_storage_entry());
       }
     }
     inline 

tests/unit_tests/CMakeLists.txt

@@ -47,6 +47,7 @@ set(unit_tests_sources
   dns_resolver.cpp
   epee_boosted_tcp_server.cpp
   epee_levin_protocol_handler_async.cpp
+  epee_serialization.cpp
   epee_utils.cpp
   expect.cpp
   fee.cpp

tests/unit_tests/epee_serialization.cpp

@@ -0,0 +1,54 @@
+// Copyright (c) 2020, The Monero Project
+//
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+//
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+//    conditions and the following disclaimer.
+//
+// 2. 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.
+//
+// 3. Neither the name of the copyright holder 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 <cstdint>
+#include <gtest/gtest.h>
+
+#include "storages/portable_storage.h"
+
+TEST(epee_binary, two_keys)
+{
+  static constexpr const std::uint8_t data[] = {
+    0x01, 0x11, 0x01, 0x1, 0x01, 0x01, 0x02, 0x1, 0x1, 0x08, 0x01, 'a',
+    0x0B, 0x00, 0x01, 'b', 0x0B, 0x00
+  };
+
+  epee::serialization::portable_storage storage{};
+  EXPECT_TRUE(storage.load_from_binary(data));
+}
+
+TEST(epee_binary, duplicate_key)
+{
+  static constexpr const std::uint8_t data[] = {
+    0x01, 0x11, 0x01, 0x1, 0x01, 0x01, 0x02, 0x1, 0x1, 0x08, 0x01, 'a',
+    0x0B, 0x00, 0x01, 'a', 0x0B, 0x00
+  };
+
+  epee::serialization::portable_storage storage{};
+  EXPECT_FALSE(storage.load_from_binary(data));
+}