biboumi: Update botan to version 3

The botan dependency has introduced a number of breaking changes with
version 3, a couple of which impact biboumi as well

This patch makes biboumi compatible with botan 3 and drops support for
botan 2 at the same time

As a consequence of the botan dependency update, C++ version has to be
upgraded to C++ 20

https://botan.randombit.net/handbook/migration_guide.html

CMakeLists.txt

@@ -30,7 +30,7 @@ find_library(LIBUBSAN NAMES ubsan libubsan.so.0)
 #
 ## Set various debug flags (instrumentation libs, coverage, …)
 #
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++1y -pedantic -Wall -Wextra -Wconversion -fvisibility=hidden -fvisibility-inlines-hidden")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++20 -pedantic -Wall -Wextra -Wconversion -fvisibility=hidden -fvisibility-inlines-hidden")
 if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
   set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -fprofile-arcs -ftest-coverage --coverage")
 endif()

README.rst

@@ -5,7 +5,7 @@ Biboumi is an XMPP gateway that connects to IRC servers and translates
 between the two protocols. It can be used to access IRC channels using any
 XMPP client as if these channels were XMPP MUCs.
 
-It is written in modern C++14 and makes great efforts to have as little
+It is written in modern C++20 and makes great efforts to have as little
 dependencies and to be as simple as possible.
 
 The goal is to provide a way to access most of IRC features using any XMPP

cmake/Modules/FindBOTAN.cmake

@@ -5,40 +5,63 @@
 #   BOTAN_FOUND  -  True if library and include directory are found
 # If set to TRUE, the following are also defined:
 #   BOTAN_INCLUDE_DIRS  -  The directory where to find the header file
-#   BOTAN_LIBRARIES  -  Where to find the library file
-#
-# For conveniance, these variables are also set. They have the same values
-# than the variables above.  The user can thus choose his/her prefered way
-# to write them.
-#   BOTAN_LIBRARY
-#   BOTAN_INCLUDE_DIR
+#   BOTAN_LIBRARIES  -  Where to find the library files
 #
 # This file is in the public domain
+# Copied and modified from
+# https://github.com/vistle/vistle/blob/master/cmake/Modules/FindBOTAN.cmake
 
-include(FindPkgConfig)
+include(FindPackageHandleStandardArgs)
 
-if(NOT BOTAN_FOUND)
-  pkg_check_modules(BOTAN botan-2)
+set(BOTAN_VERSIONS botan-3)
+set(BOTAN_NAMES botan-3 botan)
+set(BOTAN_NAMES_DEBUG botand-3 botand)
+
+find_path(
+    BOTAN_INCLUDE_DIR
+    NAMES botan/build.h
+    PATH_SUFFIXES ${BOTAN_VERSIONS}
+    DOC "The Botan include directory")
+if(BOTAN_INCLUDE_DIR)
+    file(READ "${BOTAN_INCLUDE_DIR}/botan/build.h" build)
+    string(REGEX MATCH "BOTAN_VERSION_MAJOR ([0-9]*)" _ ${build})
+    set(BOTAN_VERSION_MAJOR ${CMAKE_MATCH_1})
+    string(REGEX MATCH "BOTAN_VERSION_MINOR ([0-9]*)" _ ${build})
+    set(BOTAN_VERSION_MINOR ${CMAKE_MATCH_1})
+    string(REGEX MATCH "BOTAN_VERSION_PATCH ([0-9]*)" _ ${build})
+    set(BOTAN_VERSION_PATCH ${CMAKE_MATCH_1})
+    set(BOTAN_VERSION "${BOTAN_VERSION_MAJOR}.${BOTAN_VERSION_MINOR}.${BOTAN_VERSION_PATCH}")
 endif()
 
-if(NOT BOTAN_FOUND)
-  find_path(BOTAN_INCLUDE_DIRS NAMES botan/botan.h
-      PATH_SUFFIXES botan-2
-      DOC "The botan include directory")
+find_library(
+    BOTAN_LIBRARY
+    NAMES ${BOTAN_NAMES}
+    PATH_SUFFIXES release/lib lib
+    DOC "The Botan (release) library")
+if(MSVC)
+    find_library(
+        BOTAN_LIBRARY_DEBUG
+        NAMES ${BOTAN_NAMES_DEBUG}
+        PATH_SUFFIXES debug/lib lib
+        DOC "The Botan debug library")
+    find_package_handle_standard_args(
+        BOTAN
+        REQUIRED_VARS BOTAN_LIBRARY BOTAN_LIBRARY_DEBUG BOTAN_INCLUDE_DIR
+        VERSION_VAR BOTAN_VERSION)
+else()
+    find_package_handle_standard_args(
+        BOTAN
+        REQUIRED_VARS BOTAN_LIBRARY BOTAN_INCLUDE_DIR
+        VERSION_VAR BOTAN_VERSION)
+endif()
 
-  find_library(BOTAN_LIBRARIES NAMES botan botan-2
-      DOC "The botan library")
-
-  # Use some standard module to handle the QUIETLY and REQUIRED arguments, and
-  # set BOTAN_FOUND to TRUE if these two variables are set.
-  include(FindPackageHandleStandardArgs)
-  find_package_handle_standard_args(BOTAN REQUIRED_VARS BOTAN_LIBRARIES BOTAN_INCLUDE_DIRS)
-
-  if(BOTAN_FOUND)
-    set(BOTAN_LIBRARY ${BOTAN_LIBRARIES} CACHE INTERNAL "")
-    set(BOTAN_INCLUDE_DIR ${BOTAN_INCLUDE_DIRS} CACHE INTERNAL "")
-    set(BOTAN_FOUND ${BOTAN_FOUND} CACHE INTERNAL "")
+if(BOTAN_FOUND)
+    set(BOTAN_INCLUDE_DIRS ${BOTAN_INCLUDE_DIR})
+    if(MSVC)
+        set(BOTAN_LIBRARIES optimized ${BOTAN_LIBRARY} debug ${BOTAN_LIBRARY_DEBUG})
+    else()
+        set(BOTAN_LIBRARIES ${BOTAN_LIBRARY})
     endif()
 endif()
 
-mark_as_advanced(BOTAN_INCLUDE_DIRS BOTAN_LIBRARIES)
+mark_as_advanced(BOTAN_INCLUDE_DIR BOTAN_LIBRARY BOTAN_LIBRARY_DEBUG)

doc/install.rst

@@ -20,7 +20,7 @@ biboumi by having all dependencies.
 Tools:
 ~~~~~~
 
-- A C++14 compiler (clang >= 3.4 or gcc >= 5.0 for example)
+- A C++20 compiler (clang >= 14 or gcc >= 11.2 for example)
 - CMake
 - sphinx (optional) to build the documentation
 
@@ -51,7 +51,7 @@ udns_ (optional, but recommended)
  performances when connecting to a big number of IRC servers at the same
  time.
 
-libbotan_ 2.x (optional, but recommended)
+libbotan_ 3.x (optional, but recommended)
  Provides TLS support. Without it, IRC connections are all made in
  plain-text mode.
 

docker/test/alpine/Dockerfile

@@ -16,7 +16,7 @@ udns-dev \
 expat-dev \
 libidn-dev \
 sqlite-dev \
-botan-dev \
+botan3-dev \
 util-linux-dev \
 libgcrypt-dev \
 postgresql-dev \

docker/test/debian/Dockerfile

@@ -16,7 +16,7 @@ libudns-dev \
 libexpat1-dev \
 libidn11-dev \
 libsqlite3-dev \
-libbotan-2-dev \
+libbotan-3-dev \
 libsystemd-dev \
 uuid-dev \
 libgcrypt20-dev \

docker/test/fedora/Dockerfile

@@ -5,6 +5,7 @@ FROM fedora:latest
 
 ENV LC_ALL=C.UTF-8
 
+# TODO: upgrade to botan3
 RUN dnf --refresh install -y \
 git \
 make \

src/irc/irc_client.cpp

@@ -213,7 +213,7 @@ void IrcClient::start()
   auto options = Database::get_irc_server_options(this->bridge.get_bare_jid(),
                                                   this->get_hostname());
 # ifdef BOTAN_FOUND
-  this->credential_manager.set_trusted_fingerprint(options.col<Database::TrustedFingerprint>());
+  this->credential_manager->set_trusted_fingerprint(options.col<Database::TrustedFingerprint>());
 # endif
   if (Config::get("fixed_irc_server", "").empty() &&
       !options.col<Database::Address>().empty())

src/network/credentials_manager.cpp

@@ -39,7 +39,7 @@ const std::string& BasicCredentialsManager::get_trusted_fingerprint() const
 }
 
 void check_tls_certificate(const std::vector<Botan::X509_Certificate>& certs,
-                           const std::string& hostname, const std::string& trusted_fingerprint,
+                           const std::string_view hostname, const std::string& trusted_fingerprint,
                            const std::exception_ptr& exc)
 {
 

src/network/credentials_manager.hpp

@@ -19,7 +19,7 @@ class TCPSocketHandler;
  * on a trusted fingerprint.
  */
 void check_tls_certificate(const std::vector<Botan::X509_Certificate>& certs,
-                           const std::string& hostname, const std::string& trusted_fingerprint,
+                           const std::string_view hostname, const std::string& trusted_fingerprint,
                            const std::exception_ptr& exc);
 
 class BasicCredentialsManager: public Botan::Credentials_Manager

src/network/tcp_socket_handler.cpp

@@ -16,23 +16,29 @@
 # include <botan/hex.h>
 # include <botan/auto_rng.h>
 # include <botan/tls_exceptn.h>
+# include <botan/tls_session_manager_memory.h>
+# include <botan/tls_session_manager_hybrid.h>
 # include <config/config.hpp>
 # include <utils/dirname.hpp>
 
 namespace
 {
-    Botan::AutoSeeded_RNG& get_rng()
+    std::shared_ptr<Botan::RandomNumberGenerator>& get_rng()
     {
-      static Botan::AutoSeeded_RNG rng{};
+      static std::shared_ptr<Botan::RandomNumberGenerator> rng;
+
+      if (!rng)
+        rng = std::make_shared<Botan::AutoSeeded_RNG>();
       return rng;
     }
-    Botan::TLS::Session_Manager_In_Memory& get_session_manager()
+    std::shared_ptr<Botan::TLS::Session_Manager>& get_session_manager(std::shared_ptr<BasicCredentialsManager> creds)
     {
-      static Botan::TLS::Session_Manager_In_Memory session_manager{get_rng()};
-#if BOTAN_VERSION_CODE < BOTAN_VERSION_CODE_FOR(2,4,0)
-      // workaround for https://github.com/randombit/botan/issues/1276
-      session_manager.remove_all();
-#endif
+      static std::shared_ptr<Botan::TLS::Session_Manager> session_manager;
+
+      if (!session_manager)
+        session_manager = std::make_shared<Botan::TLS::Session_Manager_Hybrid>(
+            std::make_unique<Botan::TLS::Session_Manager_In_Memory>(get_rng()),
+            creds, get_rng());
       return session_manager;
     }
 }
@@ -50,7 +56,8 @@ TCPSocketHandler::TCPSocketHandler(std::shared_ptr<Poller>& poller):
   SocketHandler(poller, -1),
   use_tls(false)
 #ifdef BOTAN_FOUND
-  ,credential_manager()
+  ,credential_manager(std::make_shared<BasicCredentialsManager>())
+  ,policy(std::make_shared<BiboumiTLSPolicy>())
 #endif
 {}
 
@@ -242,11 +249,11 @@ void TCPSocketHandler::start_tls(const std::string& address, const std::string&
   auto policy_directory = Config::get("policy_directory", utils::dirname(Config::get_filename()));
   if (!policy_directory.empty() && policy_directory[policy_directory.size()-1] != '/')
     policy_directory += '/';
-  this->policy.load(policy_directory + "policy.txt");
-  this->policy.load(policy_directory + address + ".policy.txt");
+  this->policy->load(policy_directory + "policy.txt");
+  this->policy->load(policy_directory + address + ".policy.txt");
   this->tls = std::make_unique<Botan::TLS::Client>(
-      *this,
-      get_session_manager(), this->credential_manager, this->policy,
+      shared_from_this(),
+      get_session_manager(this->credential_manager), this->credential_manager, this->policy,
       get_rng(), server_info, Botan::TLS::Protocol_Version::latest_tls_version());
 }
 
@@ -298,17 +305,16 @@ void TCPSocketHandler::tls_send(std::string&& data)
                          std::make_move_iterator(data.end()));
 }
 
-void TCPSocketHandler::tls_record_received(uint64_t, const Botan::byte *data, size_t size)
+void TCPSocketHandler::tls_record_received(uint64_t, std::span<const uint8_t> data)
 {
-  this->in_buf += std::string(reinterpret_cast<const char*>(data),
-                              size);
+  this->in_buf += std::string(data.begin(), data.end());
   if (!this->in_buf.empty())
-    this->parse_in_buffer(size);
+    this->parse_in_buffer(data.size());
 }
 
-void TCPSocketHandler::tls_emit_data(const Botan::byte *data, size_t size)
+void TCPSocketHandler::tls_emit_data(std::span<const uint8_t> data)
 {
-  this->raw_send(std::string(reinterpret_cast<const char*>(data), size));
+  this->raw_send(std::string(data.begin(), data.end()));
 }
 
 void TCPSocketHandler::tls_alert(Botan::TLS::Alert alert)
@@ -316,25 +322,24 @@ void TCPSocketHandler::tls_alert(Botan::TLS::Alert alert)
   log_debug("tls_alert: ", alert.type_string());
 }
 
-bool TCPSocketHandler::tls_session_established(const Botan::TLS::Session& session)
+void TCPSocketHandler::tls_session_established(const Botan::TLS::Session_Summary& session)
 {
   log_debug("Handshake with ", session.server_info().hostname(), " complete.",
             " Version: ", session.version().to_string(),
             " using ", session.ciphersuite().to_string());
   if (!session.session_id().empty())
     log_debug("Session ID ", Botan::hex_encode(session.session_id()));
-  if (!session.session_ticket().empty())
-    log_debug("Session ticket ", Botan::hex_encode(session.session_ticket()));
-  return true;
+  if (session.session_ticket().has_value())
+    log_debug("Session ticket ", Botan::hex_encode(*session.session_ticket()));
 }
 
 void TCPSocketHandler::tls_verify_cert_chain(const std::vector<Botan::X509_Certificate>& cert_chain,
-                                             const std::vector<std::shared_ptr<const Botan::OCSP::Response>>& ocsp_responses,
+                                             const std::vector<std::optional<Botan::OCSP::Response>>& ocsp_responses,
                                              const std::vector<Botan::Certificate_Store*>& trusted_roots,
-                                             Botan::Usage_Type usage, const std::string& hostname,
+                                             Botan::Usage_Type usage, std::string_view hostname,
                                              const Botan::TLS::Policy& policy)
 {
-  if (!this->policy.verify_certificate)
+  if (!this->policy->verify_certificate)
     {
       log_debug("Not verifying certificate due to domain policy ");
       return;
@@ -352,7 +357,7 @@ void TCPSocketHandler::tls_verify_cert_chain(const std::vector<Botan::X509_Certi
       if (this->abort_on_invalid_cert())
         exception_ptr = std::current_exception();
 
-      check_tls_certificate(cert_chain, hostname, this->credential_manager.get_trusted_fingerprint(), exception_ptr);
+      check_tls_certificate(cert_chain, hostname, this->credential_manager->get_trusted_fingerprint(), exception_ptr);
     }
 }
 

src/network/tcp_socket_handler.hpp

@@ -30,6 +30,7 @@
  * But doesn’t do any connect() or accept() or anything else.
  */
 class TCPSocketHandler: public SocketHandler
+    ,public std::enable_shared_from_this<TCPSocketHandler>
 #ifdef BOTAN_FOUND
     ,public Botan::TLS::Callbacks
 #endif
@@ -137,12 +138,12 @@ private:
    * Called by the tls object that some data has been decrypt. We call
    * parse_in_buffer() to handle that unencrypted data.
    */
-  void tls_record_received(uint64_t rec_no, const Botan::byte* data, size_t size) override final;
+  void tls_record_received(uint64_t rec_no, std::span<const uint8_t> data) override final;
   /**
    * Called by the tls object to indicate that some data has been encrypted
    * and is now ready to be sent on the socket as is.
    */
-  void tls_emit_data(const Botan::byte* data, size_t size) override final;
+  void tls_emit_data(std::span<const uint8_t> data) override final;
   /**
    * Called by the tls object to indicate that a TLS alert has been
    * received. We don’t use it, we just log some message, at the moment.
@@ -152,13 +153,13 @@ private:
    * Called by the tls object at the end of the TLS handshake. We don't do
    * anything here appart from logging the TLS session information.
    */
-  bool tls_session_established(const Botan::TLS::Session& session) override final;
+  void tls_session_established(const Botan::TLS::Session_Summary& session) override final;
 
   void tls_verify_cert_chain(const std::vector<Botan::X509_Certificate>& cert_chain,
-                             const std::vector<std::shared_ptr<const Botan::OCSP::Response>>& ocsp_responses,
+                             const std::vector<std::optional<Botan::OCSP::Response>>& ocsp_responses,
                              const std::vector<Botan::Certificate_Store*>& trusted_roots,
                              Botan::Usage_Type usage,
-                             const std::string& hostname,
+                             std::string_view hostname,
                              const Botan::TLS::Policy& policy) override final;
   /**
    * Called whenever the tls session goes from inactive to active. This
@@ -203,9 +204,9 @@ protected:
 
 #ifdef BOTAN_FOUND
 protected:
-  BasicCredentialsManager credential_manager;
+  std::shared_ptr<BasicCredentialsManager> credential_manager;
 private:
-  BiboumiTLSPolicy policy;
+  std::shared_ptr<BiboumiTLSPolicy> policy;
   /**
    * We use a unique_ptr because we may not want to create the object at
    * all. The Botan::TLS::Client object generates a handshake message and

src/network/tls_policy.cpp

@@ -8,7 +8,6 @@
 
 #include <network/tls_policy.hpp>
 #include <logger/logger.hpp>
-#include <botan/parsing.h>
 #include <botan/exceptn.h>
 
 bool BiboumiTLSPolicy::load(const std::string& filename)
@@ -31,7 +30,7 @@ bool BiboumiTLSPolicy::load(const std::string& filename)
 
 void BiboumiTLSPolicy::load(std::istream& is)
 {
-  const auto dict = Botan::read_cfg(is);
+  const auto dict = BiboumiTLSPolicy::read_cfg(is);
   for (const auto& pair: dict)
     {
       // Workaround for options that are not overridden in Botan::TLS::Text_Policy
@@ -49,4 +48,56 @@ bool BiboumiTLSPolicy::require_cert_revocation_info() const
   return this->req_cert_revocation_info;
 }
 
+std::map<std::string, std::string> BiboumiTLSPolicy::read_cfg(std::istream& is) {
+   std::map<std::string, std::string> kv;
+   size_t line = 0;
+
+   while(is.good()) {
+      std::string s;
+
+      std::getline(is, s);
+
+      ++line;
+
+      if(s.empty() || s[0] == '#') {
+         continue;
+      }
+
+      s = clean_ws(s.substr(0, s.find('#')));
+
+      if(s.empty()) {
+         continue;
+      }
+
+      auto eq = s.find('=');
+
+      if(eq == std::string::npos || eq == 0 || eq == s.size() - 1) {
+         throw Botan::Decoding_Error("Bad read_cfg input '" + s + "' on line " + std::to_string(line));
+      }
+
+      const std::string key = BiboumiTLSPolicy::clean_ws(s.substr(0, eq));
+      const std::string val = BiboumiTLSPolicy::clean_ws(s.substr(eq + 1, std::string::npos));
+
+      kv[key] = val;
+   }
+
+   return kv;
+}
+
+std::string BiboumiTLSPolicy::clean_ws(std::string_view s) {
+   const char* ws = " \t\n";
+   auto start = s.find_first_not_of(ws);
+   auto end = s.find_last_not_of(ws);
+
+   if(start == std::string::npos) {
+      return "";
+   }
+
+   if(end == std::string::npos) {
+      return std::string(s.substr(start, end));
+   } else {
+      return std::string(s.substr(start, start + end + 1));
+   }
+}
+
 #endif

src/network/tls_policy.hpp

@@ -24,6 +24,12 @@ public:
   bool verify_certificate{true};
 protected:
   bool req_cert_revocation_info{true};
+private:
+  // Copied from botan-3's src/lib/utils/read_cfg.cpp
+  // These were made internal in v3, but they are in use by biboumi so they have
+  // to be vendored in
+  static std::map<std::string, std::string> read_cfg(std::istream& is);
+  static std::string clean_ws(std::string_view s);
 };
 
 #endif