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mbedtls/programs/ssl/ssl_fork_server.c
Gilles Peskine 1392017263 Remove unreachable assignments 
This is harmless, but we might as well remove the unreachable line. If we
ever add a break to the loop and we don't think of changing the surrounding
code, it would make more sense not to set exit_code to SUCCESS.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
2024-10-07 11:23:39 +02:00

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/*
* SSL server demonstration program using fork() for handling multiple clients
*
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
*/
#include "mbedtls/build_info.h"
#include "mbedtls/platform.h"
#if !defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_CTR_DRBG_C) || \
!defined(MBEDTLS_NET_C) || !defined(MBEDTLS_SSL_SRV_C) || \
!defined(MBEDTLS_PEM_PARSE_C) || !defined(MBEDTLS_X509_CRT_PARSE_C)
int main(void)
{
mbedtls_printf("MBEDTLS_ENTROPY_C and/or MBEDTLS_CTR_DRBG_C and/or "
"MBEDTLS_NET_C and/or MBEDTLS_SSL_SRV_C and/or "
"MBEDTLS_PEM_PARSE_C and/or MBEDTLS_X509_CRT_PARSE_C "
"not defined.\n");
mbedtls_exit(0);
}
#elif defined(_WIN32)
int main(void)
{
mbedtls_printf("_WIN32 defined. This application requires fork() and signals "
"to work correctly.\n");
mbedtls_exit(0);
}
#else
#include "mbedtls/entropy.h"
#include "mbedtls/ctr_drbg.h"
#include "test/certs.h"
#include "mbedtls/x509.h"
#include "mbedtls/ssl.h"
#include "mbedtls/net_sockets.h"
#include "mbedtls/timing.h"
#include <string.h>
#include <signal.h>
#if !defined(_MSC_VER) || defined(EFIX64) || defined(EFI32)
#include <unistd.h>
#endif
#define HTTP_RESPONSE \
"HTTP/1.0 200 OK\r\nContent-Type: text/html\r\n\r\n" \
"<h2>Mbed TLS Test Server</h2>\r\n" \
"<p>Successful connection using: %s</p>\r\n"
#define DEBUG_LEVEL 0
static void my_debug(void *ctx, int level,
const char *file, int line,
const char *str)
{
((void) level);
mbedtls_fprintf((FILE *) ctx, "%s:%04d: %s", file, line, str);
fflush((FILE *) ctx);
}
int main(void)
{
int ret = 1, len, cnt = 0, pid;
int exit_code = MBEDTLS_EXIT_FAILURE;
mbedtls_net_context listen_fd, client_fd;
unsigned char buf[1024];
const char *pers = "ssl_fork_server";
mbedtls_entropy_context entropy;
mbedtls_ctr_drbg_context ctr_drbg;
mbedtls_ssl_context ssl;
mbedtls_ssl_config conf;
mbedtls_x509_crt srvcert;
mbedtls_pk_context pkey;
mbedtls_net_init(&listen_fd);
mbedtls_net_init(&client_fd);
mbedtls_ssl_init(&ssl);
mbedtls_ssl_config_init(&conf);
mbedtls_entropy_init(&entropy);
mbedtls_pk_init(&pkey);
mbedtls_x509_crt_init(&srvcert);
mbedtls_ctr_drbg_init(&ctr_drbg);
psa_status_t status = psa_crypto_init();
if (status != PSA_SUCCESS) {
mbedtls_fprintf(stderr, "Failed to initialize PSA Crypto implementation: %d\n",
(int) status);
goto exit;
}
signal(SIGCHLD, SIG_IGN);
/*
* 0. Initial seeding of the RNG
*/
mbedtls_printf("\n . Initial seeding of the random generator...");
fflush(stdout);
if ((ret = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func, &entropy,
(const unsigned char *) pers,
strlen(pers))) != 0) {
mbedtls_printf(" failed! mbedtls_ctr_drbg_seed returned %d\n\n", ret);
goto exit;
}
mbedtls_printf(" ok\n");
/*
* 1. Load the certificates and private RSA key
*/
mbedtls_printf(" . Loading the server cert. and key...");
fflush(stdout);
/*
* This demonstration program uses embedded test certificates.
* Instead, you may want to use mbedtls_x509_crt_parse_file() to read the
* server and CA certificates, as well as mbedtls_pk_parse_keyfile().
*/
ret = mbedtls_x509_crt_parse(&srvcert, (const unsigned char *) mbedtls_test_srv_crt,
mbedtls_test_srv_crt_len);
if (ret != 0) {
mbedtls_printf(" failed! mbedtls_x509_crt_parse returned %d\n\n", ret);
goto exit;
}
ret = mbedtls_x509_crt_parse(&srvcert, (const unsigned char *) mbedtls_test_cas_pem,
mbedtls_test_cas_pem_len);
if (ret != 0) {
mbedtls_printf(" failed! mbedtls_x509_crt_parse returned %d\n\n", ret);
goto exit;
}
ret = mbedtls_pk_parse_key(&pkey, (const unsigned char *) mbedtls_test_srv_key,
mbedtls_test_srv_key_len, NULL, 0,
mbedtls_ctr_drbg_random, &ctr_drbg);
if (ret != 0) {
mbedtls_printf(" failed! mbedtls_pk_parse_key returned %d\n\n", ret);
goto exit;
}
mbedtls_printf(" ok\n");
/*
* 1b. Prepare SSL configuration
*/
mbedtls_printf(" . Configuring SSL...");
fflush(stdout);
if ((ret = mbedtls_ssl_config_defaults(&conf,
MBEDTLS_SSL_IS_SERVER,
MBEDTLS_SSL_TRANSPORT_STREAM,
MBEDTLS_SSL_PRESET_DEFAULT)) != 0) {
mbedtls_printf(" failed! mbedtls_ssl_config_defaults returned %d\n\n", ret);
goto exit;
}
mbedtls_ssl_conf_rng(&conf, mbedtls_ctr_drbg_random, &ctr_drbg);
mbedtls_ssl_conf_dbg(&conf, my_debug, stdout);
mbedtls_ssl_conf_ca_chain(&conf, srvcert.next, NULL);
if ((ret = mbedtls_ssl_conf_own_cert(&conf, &srvcert, &pkey)) != 0) {
mbedtls_printf(" failed! mbedtls_ssl_conf_own_cert returned %d\n\n", ret);
goto exit;
}
mbedtls_printf(" ok\n");
/*
* 2. Setup the listening TCP socket
*/
mbedtls_printf(" . Bind on https://localhost:4433/ ...");
fflush(stdout);
if ((ret = mbedtls_net_bind(&listen_fd, NULL, "4433", MBEDTLS_NET_PROTO_TCP)) != 0) {
mbedtls_printf(" failed! mbedtls_net_bind returned %d\n\n", ret);
goto exit;
}
mbedtls_printf(" ok\n");
while (1) {
/*
* 3. Wait until a client connects
*/
mbedtls_net_init(&client_fd);
mbedtls_ssl_init(&ssl);
mbedtls_printf(" . Waiting for a remote connection ...\n");
fflush(stdout);
if ((ret = mbedtls_net_accept(&listen_fd, &client_fd,
NULL, 0, NULL)) != 0) {
mbedtls_printf(" failed! mbedtls_net_accept returned %d\n\n", ret);
goto exit;
}
/*
* 3.5. Forking server thread
*/
mbedtls_printf(" . Forking to handle connection ...");
fflush(stdout);
pid = fork();
if (pid < 0) {
mbedtls_printf(" failed! fork returned %d\n\n", pid);
goto exit;
}
if (pid != 0) {
mbedtls_printf(" ok\n");
mbedtls_net_close(&client_fd);
fflush(stdout);
if ((ret = mbedtls_ctr_drbg_reseed(&ctr_drbg,
(const unsigned char *) "parent",
6)) != 0) {
mbedtls_printf(" failed! mbedtls_ctr_drbg_reseed returned %d\n\n", ret);
goto exit;
}
continue;
}
mbedtls_net_close(&listen_fd);
pid = getpid();
/*
* 4. Setup stuff
*/
mbedtls_printf("pid %d: Setting up the SSL data.\n", pid);
fflush(stdout);
if ((ret = mbedtls_ctr_drbg_reseed(&ctr_drbg,
(const unsigned char *) "child",
5)) != 0) {
mbedtls_printf(
"pid %d: SSL setup failed! mbedtls_ctr_drbg_reseed returned %d\n\n",
pid, ret);
goto exit;
}
if ((ret = mbedtls_ssl_setup(&ssl, &conf)) != 0) {
mbedtls_printf(
"pid %d: SSL setup failed! mbedtls_ssl_setup returned %d\n\n",
pid, ret);
goto exit;
}
mbedtls_ssl_set_bio(&ssl, &client_fd, mbedtls_net_send, mbedtls_net_recv, NULL);
mbedtls_printf("pid %d: SSL setup ok\n", pid);
/*
* 5. Handshake
*/
mbedtls_printf("pid %d: Performing the SSL/TLS handshake.\n", pid);
fflush(stdout);
while ((ret = mbedtls_ssl_handshake(&ssl)) != 0) {
if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
mbedtls_printf(
"pid %d: SSL handshake failed! mbedtls_ssl_handshake returned %d\n\n",
pid, ret);
goto exit;
}
}
mbedtls_printf("pid %d: SSL handshake ok\n", pid);
fflush(stdout);
/*
* 6. Read the HTTP Request
*/
mbedtls_printf("pid %d: Start reading from client.\n", pid);
fflush(stdout);
do {
len = sizeof(buf) - 1;
memset(buf, 0, sizeof(buf));
ret = mbedtls_ssl_read(&ssl, buf, len);
if (ret == MBEDTLS_ERR_SSL_WANT_READ || ret == MBEDTLS_ERR_SSL_WANT_WRITE) {
continue;
}
if (ret <= 0) {
switch (ret) {
case MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY:
mbedtls_printf("pid %d: connection was closed gracefully\n", pid);
break;
case MBEDTLS_ERR_NET_CONN_RESET:
mbedtls_printf("pid %d: connection was reset by peer\n", pid);
break;
default:
mbedtls_printf("pid %d: mbedtls_ssl_read returned %d\n", pid, ret);
break;
}
fflush(stdout);
break;
}
len = ret;
mbedtls_printf("pid %d: %d bytes read\n\n%s", pid, len, (char *) buf);
fflush(stdout);
if (ret > 0) {
break;
}
} while (1);
/*
* 7. Write the 200 Response
*/
mbedtls_printf("pid %d: Start writing to client.\n", pid);
fflush(stdout);
len = sprintf((char *) buf, HTTP_RESPONSE,
mbedtls_ssl_get_ciphersuite(&ssl));
while (cnt++ < 10) {
while ((ret = mbedtls_ssl_write(&ssl, buf, len)) <= 0) {
if (ret == MBEDTLS_ERR_NET_CONN_RESET) {
mbedtls_printf(
"pid %d: Write failed! peer closed the connection\n\n", pid);
goto exit;
}
if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
mbedtls_printf(
"pid %d: Write failed! mbedtls_ssl_write returned %d\n\n",
pid, ret);
goto exit;
}
}
len = ret;
mbedtls_printf("pid %d: %d bytes written (cnt=%d)\n\n%s\n",
pid, len, cnt, (char *) buf);
fflush(stdout);
mbedtls_net_usleep(1000000);
}
mbedtls_ssl_close_notify(&ssl);
mbedtls_printf("pid %d: shutting down\n", pid);
fflush(stdout);
goto exit;
}
exit:
mbedtls_net_free(&client_fd);
mbedtls_net_free(&listen_fd);
mbedtls_x509_crt_free(&srvcert);
mbedtls_pk_free(&pkey);
mbedtls_ssl_free(&ssl);
mbedtls_ssl_config_free(&conf);
mbedtls_ctr_drbg_free(&ctr_drbg);
mbedtls_entropy_free(&entropy);
mbedtls_psa_crypto_free();
mbedtls_exit(exit_code);
}
#endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C &&
MBEDTLS_SSL_TLS_C && MBEDTLS_SSL_SRV_C && MBEDTLS_NET_C &&
MBEDTLS_RSA_C && MBEDTLS_CTR_DRBG_C && MBEDTLS_PEM_PARSE_C &&
! _WIN32 */
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