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-rw-r--r--src/network/credentials_manager.cpp136
1 files changed, 136 insertions, 0 deletions
diff --git a/src/network/credentials_manager.cpp b/src/network/credentials_manager.cpp
new file mode 100644
index 0000000..f93a366
--- /dev/null
+++ b/src/network/credentials_manager.cpp
@@ -0,0 +1,136 @@
+#include "biboumi.h"
+
+#ifdef BOTAN_FOUND
+#include <network/tcp_socket_handler.hpp>
+#include <network/credentials_manager.hpp>
+#include <logger/logger.hpp>
+#include <botan/tls_exceptn.h>
+#include <config/config.hpp>
+
+/**
+ * TODO find a standard way to find that out.
+ */
+static const std::vector<std::string> default_cert_files = {
+ "/etc/ssl/certs/ca-bundle.crt",
+ "/etc/pki/tls/certs/ca-bundle.crt",
+ "/etc/ssl/certs/ca-certificates.crt",
+ "/etc/ca-certificates/extracted/tls-ca-bundle.pem"
+};
+
+Botan::Certificate_Store_In_Memory BasicCredentialsManager::certificate_store;
+bool BasicCredentialsManager::certs_loaded = false;
+
+BasicCredentialsManager::BasicCredentialsManager(const TCPSocketHandler* const socket_handler):
+ Botan::Credentials_Manager(),
+ socket_handler(socket_handler),
+ trusted_fingerprint{}
+{
+ BasicCredentialsManager::load_certs();
+}
+
+void BasicCredentialsManager::set_trusted_fingerprint(const std::string& fingerprint)
+{
+ this->trusted_fingerprint = fingerprint;
+}
+
+const std::string& BasicCredentialsManager::get_trusted_fingerprint() const
+{
+ return this->trusted_fingerprint;
+}
+
+void check_tls_certificate(const std::vector<Botan::X509_Certificate>& certs,
+ const std::string& hostname, const std::string& trusted_fingerprint,
+ const std::exception_ptr& exc)
+{
+
+ if (!trusted_fingerprint.empty() && !certs.empty() &&
+ trusted_fingerprint == certs[0].fingerprint() &&
+ certs[0].matches_dns_name(hostname))
+ // We trust the certificate, based on the trusted fingerprint and
+ // the fact that the hostname matches
+ return;
+
+ if (exc)
+ std::rethrow_exception(exc);
+}
+
+#if BOTAN_VERSION_CODE < BOTAN_VERSION_CODE_FOR(1,11,34)
+void BasicCredentialsManager::verify_certificate_chain(const std::string& type,
+ const std::string& purported_hostname,
+ const std::vector<Botan::X509_Certificate>& certs)
+{
+ log_debug("Checking remote certificate (", type, ") for hostname ", purported_hostname);
+ try
+ {
+ Botan::Credentials_Manager::verify_certificate_chain(type, purported_hostname, certs);
+ log_debug("Certificate is valid");
+ }
+ catch (const std::exception& tls_exception)
+ {
+ log_warning("TLS certificate check failed: ", tls_exception.what());
+ std::exception_ptr exception_ptr{};
+ if (this->socket_handler->abort_on_invalid_cert())
+ exception_ptr = std::current_exception();
+
+ check_tls_certificate(certs, purported_hostname, this->trusted_fingerprint, exception_ptr);
+ }
+}
+#endif
+
+bool BasicCredentialsManager::try_to_open_one_ca_bundle(const std::vector<std::string>& paths)
+{
+ for (const auto& path: paths)
+ {
+ try
+ {
+ Botan::DataSource_Stream bundle(path);
+ log_debug("Using ca bundle: ", path);
+ while (!bundle.end_of_data() && bundle.check_available(27))
+ {
+ // TODO: remove this work-around for Botan 1.11.29
+ // https://github.com/randombit/botan/issues/438#issuecomment-192866796
+ // Note that every certificate that fails to be transcoded into latin-1
+ // will be ignored. As a result, some TLS connection may be refused
+ // because the certificate is signed by an issuer that was ignored.
+ try {
+ Botan::X509_Certificate cert(bundle);
+ BasicCredentialsManager::certificate_store.add_certificate(cert);
+ } catch (const Botan::Decoding_Error& error) {
+ continue;
+ }
+ }
+ // Only use the first file that can successfully be read.
+ return true;
+ }
+ catch (const Botan::Stream_IO_Error& e)
+ {
+ log_debug(e.what());
+ }
+ }
+ return false;
+}
+
+void BasicCredentialsManager::load_certs()
+{
+ // Only load the certificates the first time
+ if (BasicCredentialsManager::certs_loaded)
+ return;
+ const std::string conf_path = Config::get("ca_file", "");
+ std::vector<std::string> paths;
+ if (conf_path.empty())
+ paths = default_cert_files;
+ else
+ paths.push_back(conf_path);
+
+ if (BasicCredentialsManager::try_to_open_one_ca_bundle(paths))
+ BasicCredentialsManager::certs_loaded = true;
+ else
+ log_warning("The CA could not be loaded, TLS negociation will probably fail.");
+}
+
+std::vector<Botan::Certificate_Store*> BasicCredentialsManager::trusted_certificate_authorities(const std::string&, const std::string&)
+{
+ return {&this->certificate_store};
+}
+
+#endif