ak_client_user.c

/* Пример, реализующий клиентскую часть эхо-сервера,
   использующего обмен сообщениями по каналу связи, защищенному с помощью протокола sp fiot.
   В качестве транспорта используется tcp.
   Внимание! Используются не экспортируемые функции.
   test-internal-fiot-echo-client.c
*/

 #include <stdio.h>
 #include <errno.h>
 #include <stdlib.h>
 #include <string.h>

 #include <ak_fiot.h>

#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <sys/select.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <netdb.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <fcntl.h>
#include <termios.h>
#include <pty.h>
//#include <util.h>
#include <errno.h>

#include "common.h"
#include "config.h"

#include "ak_client.h"

int spawn_pty_server(ak_fiot fctx)
{
    struct termios old_term, new_term;
    struct winsize winsize;
    char buffer[BUFSIZ];
    size_t length;
    message_t mtype = undefined_message;
    ak_uint8 *data = NULL;
    frame_type_t ftype;

    char is_found = 0;

    if (isatty(STDIN_FILENO)) {
        if (ioctl(STDIN_FILENO, TIOCGWINSZ, &winsize) < 0)
            perror("ioctl() error");
        else
            is_found = 1;
    }

    if (!is_found) {
        winsize.ws_col = 80;
        winsize.ws_row = 24;
    }

    log("winsize: %d:%d\n", winsize.ws_col, winsize.ws_row);

    if(ak_fiot_context_write_frame(fctx, (char *) &winsize, sizeof(struct winsize), encrypted_frame, application_data) != ak_error_ok) {
        debug_print("cannot send winsize\n");
        return EXIT_FAILURE;
    }
//    if (write(socket_fd, (char *) &winsize, sizeof(struct winsize)) != sizeof(struct winsize)) {
//        debug_print("cannot send winsize\n");
//        return EXIT_FAILURE;
//    }

    if (isatty(STDOUT_FILENO)) {
        if (tcgetattr(STDOUT_FILENO, &old_term) < 0) {
            perror("tcgetattr() error");
            return EXIT_FAILURE;
        }

        memcpy((void *) &new_term, (void *) &old_term, sizeof(new_term));

        new_term.c_iflag |= IGNPAR;
        new_term.c_iflag &= ~(ISTRIP | INLCR | IGNCR | ICRNL | IXON | IXANY | IXOFF);
        new_term.c_lflag &= ~(ISIG | ICANON | ECHO | ECHOE | ECHOK | ECHONL | IEXTEN);
        new_term.c_oflag &= ~(OPOST);

        new_term.c_cc[VMIN]  = 1;
        new_term.c_cc[VTIME] = 0;

        if (tcsetattr(STDOUT_FILENO, TCSADRAIN, &new_term) < 0) {
            perror("tcsetattr() error");
            return EXIT_FAILURE;
        }
    }

    while (1) {
        fd_set rset;
        int ret;

        FD_ZERO(&rset);
        FD_SET(STDIN_FILENO, &rset);
        FD_SET(fctx->iface_enc, &rset);

        ret = select(fctx->iface_enc + 1, &rset, NULL, NULL, &(struct timeval) { COMMAND_TIMEOUT, 0 });
        if (ret < 0) {
            if (errno == EINTR)
                continue;
            perror("select() error");
            break;
        }
        if (!ret) {
            printf("\n");
            log("timeout\n");
            break;
        }

        if (FD_ISSET(fctx->iface_enc, &rset)) {
            if (( data = ak_fiot_context_read_frame( fctx, &length, &mtype, &ftype )) != NULL) {
                ret = write(STDOUT_FILENO, data, length);
                if (ret <= 0) {
                    perror("write() error");
                    break;
                }
            } else {
                // fprintf(stderr, "crypto_recv() error\n");
                break;
            }
        }

        if (FD_ISSET(STDIN_FILENO, &rset)) {
            ret = read(STDIN_FILENO, buffer, BUFSIZ);
            if (ret == 0) {
                log("stdin eof\n");
                break;
            }
            if (ret < 0) {
                perror("read() error");
                break;
            }

            if (ak_fiot_context_write_frame( fctx, buffer, ret, encrypted_frame, application_data ) != ak_error_ok) {
                fprintf(stderr, "ak_fiot_context_write_frame() error\n");
            }
        }
    }

    if (isatty(STDOUT_FILENO)) {
        tcsetattr(STDOUT_FILENO, TCSADRAIN, &old_term);
    }

    log("connection has lost\n");

    return EXIT_SUCCESS;
}

//ak_uint8 blom_key[32*256] = {
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//6d7f2ad60c42d2afcc61b46ac9ad986483fc75c5b76261156cf0451d9971c051
ak_uint8 blom_key[32*256] = {1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 134, 216, 109, 127, 235, 233, 148, 56, 95, 155, 26, 212, 235, 227, 83, 193, 52, 126, 183, 28, 14, 219, 201, 159, 43, 12, 184, 242, 107, 185, 0, 16, 133, 180, 249, 107, 71, 223, 183, 134, 127, 143, 245, 216, 250, 215, 234, 43, 145, 219, 129, 101, 157, 230, 104, 40, 105, 14, 5, 96, 88, 52, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 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int main( int argc, char *argv[] )
{
  char str[2048];
  struct fiot ctx;
  int error = ak_error_ok, done = 1;
  ak_socket sock = ak_network_undefined_socket;
  struct sockaddr_in socket_address;

 /* проверяем, что определен ip адрес сервера и порт */
  if( argc != 3 ) {
    printf("usage: echo-client server_ip_address server_port\n");
    return EXIT_SUCCESS;
  }
 /* инициализируем библиотеку на стороне клиента
    вывод сообщений аудита производится в стандартный поток ошибок */
  if( !ak_libakrypt_create( ak_function_log_stderr )) return ak_libakrypt_destroy();
 /* устанавливаем максимальный уровень аудита */
//  ak_log_set_level( fiot_log_maximum );

  /* часть первая: создание сокетов */

  /* выполняем действия, необходимые для соединения с сервером  */
   if(( sock = ak_network_socket( AF_INET, SOCK_DGRAM, 0 )) == ak_network_undefined_socket ) {
     ak_error_message( ak_error_get_value(), __func__, "wrong socket creation" );
     return ak_libakrypt_destroy();
   }

   memset( &socket_address, 0, sizeof( struct sockaddr_in ));
   socket_address.sin_family = AF_INET;
   socket_address.sin_port = htons( atoi( argv[2] ));

   if(( error = ak_network_inet_pton( AF_INET, argv[1], &socket_address.sin_addr )) != ak_error_ok ) {
     ak_network_close( sock );
     ak_error_message_fmt( error, __func__, "wrong assigning binary address to socket" );
     return ak_libakrypt_destroy();
   }

   if(( error = ak_network_connect( sock, &socket_address, sizeof( socket_address ))) != ak_error_ok ) {
     ak_network_close( sock );
     ak_error_message_fmt( error, __func__, "wrong server connect" );
     return ak_libakrypt_destroy();
   }
   printf("echo-client: server connected on %s:%s\n", argv[1], argv[2] );


  /* часть вторая: аутентификация клиента и выполнение протокола выработки общих ключей */


  /* создаем контекст защищенного соединения */
   if(( error = ak_fiot_context_create( &ctx )) != ak_error_ok )
     return ak_error_message( error, __func__, "incorrect context creation" );

  /* устанавливаем роль */
   if(( error = ak_fiot_context_set_role( &ctx, client_role )) != ak_error_ok ) goto exit;
  /* устанавливаем идентификатор сервера */
   if(( error = ak_fiot_context_set_user_identifier( &ctx, server_role,
        "8e70a125ed03a9d67162b6a55beb6058b7fa05c9d4447ef9c701cdeb29a5ad0c", 64 )) != ak_error_ok ) goto exit;
   if(( error = ak_fiot_context_set_user_identifier( &ctx, client_role,
        "6d7f2ad60c42d2afcc61b46ac9ad986483fc75c5b76261156cf0451d9971c051", 64 )) != ak_error_ok ) goto exit;

  /* устанавливаем сокет для внешнего (шифрующего) интерфейса */
   if(( error = ak_fiot_context_set_interface_descriptor( &ctx,
                                    encryption_interface, sock )) != ak_error_ok ) goto exit;
  /* устанавливаем идентификатор ключа аутентификации */
   if(( error = ak_fiot_context_set_psk_identifier( &ctx,
        ePSK_key, "6d7f2ad60c42d2afcc61b46ac9ad986483fc75c5b76261156cf0451d9971c051", 64 )) != ak_error_ok ) goto exit;
   if(( error = ak_fiot_context_set_blom_key( &ctx, blom_key )) != ak_error_ok ) goto exit;
   if(( error = ak_fiot_context_set_curve( &ctx,
                              tc26_gost3410_2012_256_paramsetA )) != ak_error_ok ) goto exit;
   if(( error = ak_fiot_context_set_initial_crypto_mechanism( &ctx,
                                             magmaGOST3413ePSK )) != ak_error_ok ) goto exit;
  /* здесь реализация протокола */
   if(( error = ak_fiot_context_keys_generation_protocol( &ctx )) != ak_error_ok ) goto exit;
   printf( "echo-client: server authentication is Ok\n" );

  /* принудительно ужесточаем ограничения на объем передаваемых данных;
     изменение ограничений используется нами только для тестирования функций выработки
     производной ключевой информации и на практике не должно применяться;
     при тестировании мы используем несбалансированные ограничения для клиента и для сервера. */

    ctx.policy.restrictions.maxFrameCount = 4;
    ctx.policy.restrictions.maxFrameKeysCount = 4;
    ctx.policy.restrictions.maxApplicationSecretCount = 256;

  /* часть третья: отправка и получение сообщений */

  spawn_pty_server(&ctx);

  exit:
   ak_fiot_context_destroy( &ctx );
   ak_libakrypt_destroy();

 return EXIT_SUCCESS;
}