From c51d65ffce7b0542a15afa4d7bb252df6a970b5c Mon Sep 17 00:00:00 2001 From: lv-426 Date: Sat, 24 May 2008 13:59:21 +0000 Subject: added : * configure.ac support for --with-gnutls=PFX * TLS connection handler in daemon.c * simple TLS echo client server example --- src/examples/Makefile.am | 32 +++++- src/examples/https_echo_client_example.c | 153 ++++++++++++++++++++++++++ src/examples/https_server_example.c | 182 +++++++++++++++++++++++++++++++ 3 files changed, 364 insertions(+), 3 deletions(-) create mode 100644 src/examples/https_echo_client_example.c create mode 100644 src/examples/https_server_example.c (limited to 'src/examples') diff --git a/src/examples/Makefile.am b/src/examples/Makefile.am index 3d693b23..340f7824 100644 --- a/src/examples/Makefile.am +++ b/src/examples/Makefile.am @@ -1,10 +1,16 @@ SUBDIRS = . -INCLUDES = -I$(top_srcdir)/src/include +AM_CPPFLAGS = -I$(top_srcdir)/src/include # example programs -noinst_PROGRAMS = minimal_example querystring_example fileserver_example fileserver_example_external_select +noinst_PROGRAMS = \ +https_server_example \ +https_echo_client_example \ +minimal_example \ +querystring_example \ +fileserver_example \ +fileserver_example_external_select minimal_example_SOURCES = \ minimal_example.c @@ -21,9 +27,29 @@ fileserver_example_SOURCES = \ fileserver_example_LDADD = \ $(top_builddir)/src/daemon/libmicrohttpd.la - fileserver_example_external_select_SOURCES = \ fileserver_example_external_select.c fileserver_example_external_select_LDADD = \ $(top_builddir)/src/daemon/libmicrohttpd.la +https_server_example_CPPFLAGS = \ + $(GNUTLS_CPPFLAGS) \ + -I$(top_srcdir)/src/daemon +https_server_example_SOURCES = \ + https_server_example.c +https_server_example_LDADD = \ + $(top_builddir)/src/daemon/libmicrohttpd.la +https_server_example_LDFLAGS = \ + -L$(GNUTLS_LIB_PATH) \ + -lgnutls + +https_echo_client_example_CPPFLAGS = \ + $(GNUTLS_CPPFLAGS) \ + -I$(top_srcdir)/src/daemon +https_echo_client_example_SOURCES = \ + https_echo_client_example.c +https_echo_client_example_LDADD = \ + $(top_builddir)/src/daemon/libmicrohttpd.la +https_echo_client_example_LDFLAGS = \ + -L$(GNUTLS_LIB_PATH) \ + -lgnutls diff --git a/src/examples/https_echo_client_example.c b/src/examples/https_echo_client_example.c new file mode 100644 index 00000000..04e26c74 --- /dev/null +++ b/src/examples/https_echo_client_example.c @@ -0,0 +1,153 @@ +/* + This file is part of libmicrohttpd + (C) 2007 Christian Grothoff + + libmicrohttpd is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published + by the Free Software Foundation; either version 2, or (at your + option) any later version. + + libmicrohttpd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with libmicrohttpd; see the file COPYING. If not, write to the + Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. + */ + +/** + * @file https_echo_client.c + * @brief a simple echo client to use in conjuction with the echo TLS server. + * @author LV-426 + */ + +#if HAVE_CONFIG_H +# include +#endif + +#include +#include +#include +#include +#include +#include +#include +#include + +#define MAX_BUF 1024 +#define SA struct sockaddr +#define MSG "GET / HTTP/1.0\r\n\r\n" + +extern int tcp_connect (void); +extern void tcp_close (int sd); + +int +main (int argc, char **argv) +{ + int ret, sd, ii, err; + gnutls_session_t session; + char buffer[MAX_BUF + 1]; + gnutls_anon_client_credentials_t anoncred; + + struct sockaddr_in servaddr4; + const struct sockaddr *servaddr; + struct sockaddr_in sa; + socklen_t addrlen; + + if (argc < 2) + { + printf ("Usage : %s SERVER-PORT\n", argv[0]); + return 1; + } + + gnutls_global_init (); + + gnutls_anon_allocate_client_credentials (&anoncred); + + /* Initialize TLS session */ + gnutls_init (&session, GNUTLS_CLIENT); + + /* Use default priorities */ + gnutls_priority_set_direct (session, "PERFORMANCE:+ANON-DH:!ARCFOUR-128", + NULL); + + /* put the anonymous credentials to the current session */ + gnutls_credentials_set (session, GNUTLS_CRD_ANON, anoncred); + + sd = socket (AF_INET, SOCK_STREAM, 0); + memset (&sa, '\0', sizeof (sa)); + sa.sin_family = AF_INET; + sa.sin_port = htons (atoi (argv[1])); + inet_pton (AF_INET, "127.0.0.1", &sa.sin_addr); + + /* connect to the peer */ + err = connect (sd, (struct sockaddr *) &sa, sizeof (sa)); + if (err < 0) + { + fprintf (stderr, "Connect error\n"); + exit (1); + } + + gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) sd); + + /* Perform the TLS handshake */ + ret = gnutls_handshake (session); + + if (ret < 0) + { + fprintf (stderr, "*** Handshake failed\n"); + gnutls_perror (ret); + goto end; + } + else + { + printf ("- Handshake was completed\n"); + } + + for (;;) + { + /**/ scanf ("%s", buffer); + + if (strcmp (buffer, "exit") == 0) + { + gnutls_record_send (session, buffer, strlen (MSG)); + break; + } + gnutls_record_send (session, buffer, strlen (MSG)); + + ret = gnutls_record_recv (session, buffer, MAX_BUF); + if (ret == 0) + { + printf ("- Peer has closed the TLS connection\n"); + goto end; + } + else if (ret < 0) + { + fprintf (stderr, "*** Error: %s\n", gnutls_strerror (ret)); + break; + } + + printf ("- Received %d bytes: ", ret); + for (ii = 0; ii < ret; ii++) + { + fputc (buffer[ii], stdout); + } + fputs ("\n", stdout); + } + +end: + + shutdown (sd, SHUT_RDWR); + close (sd); + + gnutls_deinit (session); + + gnutls_anon_free_client_credentials (anoncred); + + gnutls_global_deinit (); + + return 0; +} diff --git a/src/examples/https_server_example.c b/src/examples/https_server_example.c new file mode 100644 index 00000000..709f8502 --- /dev/null +++ b/src/examples/https_server_example.c @@ -0,0 +1,182 @@ +/* + This file is part of libmicrohttpd + (C) 2007 Christian Grothoff + + libmicrohttpd is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published + by the Free Software Foundation; either version 2, or (at your + option) any later version. + + libmicrohttpd is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + You should have received a copy of the GNU General Public License + along with libmicrohttpd; see the file COPYING. If not, write to the + Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. + */ + +/** + * @file https_server_example.c + * @brief a simple echo server using TLS. echo input from client until 'exit' message is received. + * @author LV-426 + */ + +#include "config.h" +#include +#include "internal.h" + +#include +#ifndef MINGW +#include +#endif +#include +#include +#include + +#define DH_BITS 1024 +#define MAX_BUF 1024 +/* server credintials */ +gnutls_anon_server_credentials_t anoncred; + +/* server Diffie-Hellman parameters */ +static gnutls_dh_params_t dh_params; + + +/* Generate Diffie Hellman parameters - for use with DHE kx algorithms. */ +static int +generate_dh_params (void) +{ + + gnutls_dh_params_init (&dh_params); + gnutls_dh_params_generate2 (dh_params, DH_BITS); + return 0; +} + +gnutls_session_t +initialize_tls_session (void) +{ + gnutls_session_t session; + + gnutls_init (&session, GNUTLS_SERVER); + + gnutls_priority_set_direct (session, "NORMAL:+ANON-DH", NULL); + + gnutls_credentials_set (session, GNUTLS_CRD_ANON, anoncred); + + gnutls_dh_set_prime_bits (session, DH_BITS); + + return session; +} + +/* Accept Policy Callback */ +static int +TLS_echo (void *cls, + struct MHD_Connection *connection, + const char *url, + const char *method, + const char *upload_data, + const char *version, unsigned int *upload_data_size, void **ptr) +{ + gnutls_session_t session; + static int aptr; + struct MHD_Response *response; + char buffer[MAX_BUF + 1]; + int ret; + + printf ("accepted connection from %d\n", connection->addr->sin_addr); + + session = initialize_tls_session (); + + gnutls_transport_set_ptr (session, connection->socket_fd); + + ret = gnutls_handshake (session); + if (ret < 0) + { + /* set connection as closed */ + connection->socket_fd = 1; + gnutls_deinit (session); + fprintf (stderr, "*** Handshake has failed (%s)\n\n", + gnutls_strerror (ret)); + return MHD_NO; + } + + printf ("TLS Handshake completed\n"); + connection->state = MHDS_HANDSHAKE_COMPLETE; + + /* simple echo loop. message encryption/decryption is acheived through 'gnutls_record_send' + * & gnutls_record_recv calls. */ + for (;;) + { + memset (buffer, 0, MAX_BUF + 1); + ret = gnutls_record_recv (session, buffer, MAX_BUF); + + if (ret < 0) + { + fprintf (stderr, "\n*** Received corrupted " + "data(%d). Closing the connection.\n\n", ret); + break; + } + else if (ret >= 0) + { + if (strcmp (buffer, "exit") == 0) + { + printf ("\n- Peer has closed the GNUTLS connection\n"); + break; + } + else + { + /* echo data back to the client */ + gnutls_record_send (session, buffer, strlen (buffer)); + } + } + } + printf ("\n"); + + /* mark connection as closed */ + connection->socket_fd = -1; + + gnutls_deinit (session); + + return ret; +} + +int +main (int argc, char *const *argv) +{ + struct MHD_Daemon *daemon; + struct MHD_Daemon *TLS_daemon; + + /* look for HTTPS port argument */ + if (argc < 4) + { + printf ("Usage : %s HTTP-PORT SECONDS-TO-RUN HTTPS-PORT\n", argv[0]); + return 1; + } + + gnutls_global_init (); + + gnutls_anon_allocate_server_credentials (&anoncred); + + generate_dh_params (); + + gnutls_anon_set_server_dh_params (anoncred, dh_params); + + TLS_daemon = MHD_start_daemon (MHD_USE_THREAD_PER_CONNECTION + | MHD_USE_DEBUG | MHD_USE_SSL, + atoi (argv[3]), NULL, NULL, &TLS_echo, NULL, + MHD_OPTION_END); + + if (TLS_daemon == NULL) + return 1; + sleep (atoi (argv[2])); + + MHD_stop_daemon (daemon); + + gnutls_anon_free_server_credentials (anoncred); + + gnutls_global_deinit (); + return 0; +} -- cgit v1.2.3