Skrevet av Emne: C++ OpenSSL BIO* from accept() on plain socket file descriptor  (Lest 1660 ganger)

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  • I wanted to use TLS on a regular socket file descriptor and could not find a single man-page or example explaining how to construct the BIO* that let me do cleartext BIO_read() and BIO_write() on a HTTPS socket.

    After much experimenting, I finally figured it out. Making a note here for future reference.

    Kode: [Velg]
    // context is a smart pointer to a CTX* structure containing certs etc.
    // server_fd is a plain TCP socket descriptor in "listen" mode
    // returns client_fd that your application must close
    // Use BIO_read() and BIO_write() to communicate with the client,
    // you *MUST NOT* read/write on client_fd
    int Socket::accept(const Context& context, int server_fd)
    {
      this->verify_flag = -1;
      this->ssl = nullptr;
      this->bio = nullptr;

      // TCP accept
      int client_fd = Net::accept(server_fd);
      if (client_fd != -1) {
        // TCP accept successful

        // Create a BIO chain and get the SSL pointer
        BIO* raw = BIO_new_socket(client_fd, BIO_NOCLOSE);
        BIO* ssl = BIO_new_ssl(context.get(), 0); // 0=server, 1=client
        this->bio = BIO_push(ssl, raw);
        BIO_get_ssl(ssl, &this->ssl);
       
        // SSL protocol accept
        int rc = SSL_accept(this->ssl);
        if (rc <= 0) {
          // 0 = SSL failure, <0 = connection failure
          report_error("SSL_accept...");
          Net::close(client_fd);
          client_fd = -1;
        }

        std::cout << "calling SSL_get_verify_result()" << std::endl;
        this->verify_flag = SSL_get_verify_result(this->ssl);
      }
      return client_fd;
    }



    -Floyd.

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