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mbedtls/programs/ssl/ssl_client1.c
Gilles Peskine 5333425891 Always call psa_crypto_init before using TLS 
In Mbed TLS 4.0, all cryptography goes through PSA, so calling
psa_crypto_init() is now mandatory before starting a TLS connection (as was
the case in Mbed TLS 3.x with MBEDTLS_USE_PSA_CRYPTO enabled).

Switch the TLS sample programs to calling psa_crypto_init() unconditionally.
Otherwise TLS 1.3 connections fail, and (D)TLS 1.2 connections soon will.

This commit omits the test programs ssl_client2 and ssl_server2, which don't
require a change right now. They will be covered when we make
MBEDTLS_USE_PSA_CRYPTO always on.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
2024-09-25 21:12:57 +02:00

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/*
* SSL client demonstration program
*
* 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_CLI_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_CLI_C and/or "
"MBEDTLS_PEM_PARSE_C and/or MBEDTLS_X509_CRT_PARSE_C "
"not defined.\n");
mbedtls_exit(0);
}
#else
#include "mbedtls/net_sockets.h"
#include "mbedtls/debug.h"
#include "mbedtls/ssl.h"
#include "mbedtls/entropy.h"
#include "mbedtls/ctr_drbg.h"
#include "mbedtls/error.h"
#include "test/certs.h"
#include <string.h>
#define SERVER_PORT "4433"
#define SERVER_NAME "localhost"
#define GET_REQUEST "GET / HTTP/1.0\r\n\r\n"
#define DEBUG_LEVEL 1
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;
int exit_code = MBEDTLS_EXIT_FAILURE;
mbedtls_net_context server_fd;
uint32_t flags;
unsigned char buf[1024];
const char *pers = "ssl_client1";
mbedtls_entropy_context entropy;
mbedtls_ctr_drbg_context ctr_drbg;
mbedtls_ssl_context ssl;
mbedtls_ssl_config conf;
mbedtls_x509_crt cacert;
#if defined(MBEDTLS_DEBUG_C)
mbedtls_debug_set_threshold(DEBUG_LEVEL);
#endif
/*
* 0. Initialize the RNG and the session data
*/
mbedtls_net_init(&server_fd);
mbedtls_ssl_init(&ssl);
mbedtls_ssl_config_init(&conf);
mbedtls_x509_crt_init(&cacert);
mbedtls_ctr_drbg_init(&ctr_drbg);
mbedtls_entropy_init(&entropy);
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;
}
mbedtls_printf("\n . Seeding the random number 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\n ! mbedtls_ctr_drbg_seed returned %d\n", ret);
goto exit;
}
mbedtls_printf(" ok\n");
/*
* 0. Initialize certificates
*/
mbedtls_printf(" . Loading the CA root certificate ...");
fflush(stdout);
ret = mbedtls_x509_crt_parse(&cacert, (const unsigned char *) mbedtls_test_cas_pem,
mbedtls_test_cas_pem_len);
if (ret < 0) {
mbedtls_printf(" failed\n ! mbedtls_x509_crt_parse returned -0x%x\n\n",
(unsigned int) -ret);
goto exit;
}
mbedtls_printf(" ok (%d skipped)\n", ret);
/*
* 1. Start the connection
*/
mbedtls_printf(" . Connecting to tcp/%s/%s...", SERVER_NAME, SERVER_PORT);
fflush(stdout);
if ((ret = mbedtls_net_connect(&server_fd, SERVER_NAME,
SERVER_PORT, MBEDTLS_NET_PROTO_TCP)) != 0) {
mbedtls_printf(" failed\n ! mbedtls_net_connect returned %d\n\n", ret);
goto exit;
}
mbedtls_printf(" ok\n");
/*
* 2. Setup stuff
*/
mbedtls_printf(" . Setting up the SSL/TLS structure...");
fflush(stdout);
if ((ret = mbedtls_ssl_config_defaults(&conf,
MBEDTLS_SSL_IS_CLIENT,
MBEDTLS_SSL_TRANSPORT_STREAM,
MBEDTLS_SSL_PRESET_DEFAULT)) != 0) {
mbedtls_printf(" failed\n ! mbedtls_ssl_config_defaults returned %d\n\n", ret);
goto exit;
}
mbedtls_printf(" ok\n");
/* OPTIONAL is not optimal for security,
* but makes interop easier in this simplified example */
mbedtls_ssl_conf_authmode(&conf, MBEDTLS_SSL_VERIFY_OPTIONAL);
mbedtls_ssl_conf_ca_chain(&conf, &cacert, NULL);
mbedtls_ssl_conf_rng(&conf, mbedtls_ctr_drbg_random, &ctr_drbg);
mbedtls_ssl_conf_dbg(&conf, my_debug, stdout);
if ((ret = mbedtls_ssl_setup(&ssl, &conf)) != 0) {
mbedtls_printf(" failed\n ! mbedtls_ssl_setup returned %d\n\n", ret);
goto exit;
}
if ((ret = mbedtls_ssl_set_hostname(&ssl, SERVER_NAME)) != 0) {
mbedtls_printf(" failed\n ! mbedtls_ssl_set_hostname returned %d\n\n", ret);
goto exit;
}
mbedtls_ssl_set_bio(&ssl, &server_fd, mbedtls_net_send, mbedtls_net_recv, NULL);
/*
* 4. Handshake
*/
mbedtls_printf(" . Performing the SSL/TLS handshake...");
fflush(stdout);
while ((ret = mbedtls_ssl_handshake(&ssl)) != 0) {
if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
mbedtls_printf(" failed\n ! mbedtls_ssl_handshake returned -0x%x\n\n",
(unsigned int) -ret);
goto exit;
}
}
mbedtls_printf(" ok\n");
/*
* 5. Verify the server certificate
*/
mbedtls_printf(" . Verifying peer X.509 certificate...");
/* In real life, we probably want to bail out when ret != 0 */
if ((flags = mbedtls_ssl_get_verify_result(&ssl)) != 0) {
#if !defined(MBEDTLS_X509_REMOVE_INFO)
char vrfy_buf[512];
#endif
mbedtls_printf(" failed\n");
#if !defined(MBEDTLS_X509_REMOVE_INFO)
mbedtls_x509_crt_verify_info(vrfy_buf, sizeof(vrfy_buf), " ! ", flags);
mbedtls_printf("%s\n", vrfy_buf);
#endif
} else {
mbedtls_printf(" ok\n");
}
/*
* 3. Write the GET request
*/
mbedtls_printf(" > Write to server:");
fflush(stdout);
len = sprintf((char *) buf, GET_REQUEST);
while ((ret = mbedtls_ssl_write(&ssl, buf, len)) <= 0) {
if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
mbedtls_printf(" failed\n ! mbedtls_ssl_write returned %d\n\n", ret);
goto exit;
}
}
len = ret;
mbedtls_printf(" %d bytes written\n\n%s", len, (char *) buf);
/*
* 7. Read the HTTP response
*/
mbedtls_printf(" < Read from server:");
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 == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY) {
mbedtls_printf("The return value %d from mbedtls_ssl_read() means that the server\n"
"closed the connection first. We're ok with that.\n",
MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY);
break;
}
if (ret < 0) {
mbedtls_printf("failed\n ! mbedtls_ssl_read returned %d\n\n", ret);
break;
}
if (ret == 0) {
mbedtls_printf("\n\nEOF\n\n");
break;
}
len = ret;
mbedtls_printf(" %d bytes read\n\n%s", len, (char *) buf);
} while (1);
mbedtls_ssl_close_notify(&ssl);
if (ret == 0 || ret == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY) {
exit_code = MBEDTLS_EXIT_SUCCESS;
}
exit:
#ifdef MBEDTLS_ERROR_C
if (exit_code != MBEDTLS_EXIT_SUCCESS) {
char error_buf[100];
mbedtls_strerror(ret, error_buf, 100);
mbedtls_printf("Last error was: %d - %s\n\n", ret, error_buf);
}
#endif
mbedtls_net_free(&server_fd);
mbedtls_x509_crt_free(&cacert);
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 /* configuration allows running this program */
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