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Improve resilience against memory attacks

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To reduce residual fragments of secret data in memory after
deallocation, this patch replaces the global delete operator with a
version that zeros out previously allocated memory. It makes use of
the new C++14 sized deallocation, but provides an unsized fallback
with platform-specific size deductions.

This change is only a minor mitigation and cannot protect against
buffer reallocations by the operating system or non-C++ libraries.
Thus, we still cannot guarantee all memory to be wiped after free.

As a further improvement, this patch uses libgcrypt and libsodium
to write long-lived master key component hashes into a secure
memory area and wipe it afterwards.

The patch also fixes compiler flags not being set properly on macOS.
This commit is contained in:
Janek Bevendorff 2019-02-21 22:28:45 +01:00 • committed by Jonathan White
parent c7898fdeee
commit 13eb1c0bbd
14 changed files with 207 additions and 28 deletions
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3
src/proxy/CMakeLists.txt
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@ -18,12 +18,13 @@ if(WITH_XC_BROWSER)
include_directories(${BROWSER_SOURCE_DIR})
set(proxy_SOURCES
../core/Alloc.cpp
keepassxc-proxy.cpp
${BROWSER_SOURCE_DIR}/NativeMessagingBase.cpp
NativeMessagingHost.cpp)
add_library(proxy STATIC ${proxy_SOURCES})
target_link_libraries(proxy Qt5::Core Qt5::Network)
target_link_libraries(proxy Qt5::Core Qt5::Network ${sodium_LIBRARY_RELEASE})
add_executable(keepassxc-proxy keepassxc-proxy.cpp)
target_link_libraries(keepassxc-proxy proxy)