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98 lines
3.1 KiB
98 lines
3.1 KiB
// Copyright 2019 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "util/crypto/openssl_util.h"
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#include <openssl/crypto.h>
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#include <openssl/err.h>
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#include <openssl/ssl.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <sstream>
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#include <string>
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#include <utility>
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#include "absl/strings/string_view.h"
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#include "util/osp_logging.h"
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namespace openscreen {
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namespace {
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// Callback routine for OpenSSL to print error messages. |str| is a
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// nullptr-terminated string of length |len| containing diagnostic information
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// such as the library, function and reason for the error, the file and line
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// where the error originated, plus potentially any context-specific
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// information about the error. |context| contains a pointer to user-supplied
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// data, which is currently unused.
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// If this callback returns a value <= 0, OpenSSL will stop processing the
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// error queue and return, otherwise it will continue calling this function
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// until all errors have been removed from the queue.
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int OpenSSLErrorCallback(const char* str, size_t len, void* context) {
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OSP_DVLOG << "\t" << absl::string_view(str, len);
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return 1;
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}
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} // namespace
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void EnsureOpenSSLInit() {
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// If SSL fails to initialize, we can't run crypto.
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OSP_CHECK(OPENSSL_init_ssl(OPENSSL_INIT_LOAD_SSL_STRINGS, nullptr) == 1);
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}
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void EnsureOpenSSLCleanup() {
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EVP_cleanup();
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}
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void ClearOpenSSLERRStack(const Location& location) {
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if (OSP_DCHECK_IS_ON()) {
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uint32_t error_num = ERR_peek_error();
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if (error_num == 0) {
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return;
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}
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OSP_DVLOG << "OpenSSL ERR_get_error stack from " << location.ToString();
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ERR_print_errors_cb(&OpenSSLErrorCallback, nullptr);
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} else {
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ERR_clear_error();
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}
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}
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// General note about SSL errors. Error messages are pushed to the general
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// OpenSSL error queue. Call ClearOpenSSLERRStack before calling any
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// SSL methods.
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Error GetSSLError(const SSL* ssl, int return_code) {
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const int error_code = SSL_get_error(ssl, return_code);
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if (error_code == SSL_ERROR_NONE) {
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return Error::None();
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}
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// Create error message w/ unwind of error stack + original SSL error string.
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std::stringstream msg;
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msg << "boringssl error (" << error_code
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<< "): " << SSL_error_description(error_code);
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while (uint32_t packed_error = ERR_get_error()) {
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msg << "\nerr stack: " << ERR_reason_error_string(packed_error);
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}
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std::string message = msg.str();
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switch (error_code) {
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case SSL_ERROR_ZERO_RETURN:
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return Error(Error::Code::kSocketClosedFailure, std::move(message));
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case SSL_ERROR_WANT_READ: // fallthrough
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case SSL_ERROR_WANT_WRITE: // fallthrough
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case SSL_ERROR_WANT_CONNECT: // fallthrough
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case SSL_ERROR_WANT_ACCEPT: // fallthrough
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case SSL_ERROR_WANT_X509_LOOKUP:
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return Error(Error::Code::kAgain, std::move(message));
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case SSL_ERROR_SYSCALL: // fallthrough
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case SSL_ERROR_SSL:
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return Error(Error::Code::kFatalSSLError, std::move(message));
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}
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OSP_NOTREACHED();
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}
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} // namespace openscreen
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