#include <http_parser.h>
#include "esp_tls.h"
-
static const char *TAG = "esp-tls";
#ifdef ESP_PLATFORM
static ssize_t tls_read(esp_tls_t *tls, char *data, size_t datalen)
{
- ssize_t ret = SSL_read(tls->ssl, data, datalen);
+ ssize_t ret = mbedtls_ssl_read(&tls->ssl, (unsigned char *)data, datalen);
if (ret < 0) {
- int err = SSL_get_error(tls->ssl, ret);
- if (err != SSL_ERROR_WANT_WRITE && err != SSL_ERROR_WANT_READ) {
- ESP_LOGE(TAG, "read error :%d:", ret);
- }
- return -err;
+ if (ret == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY) {
+ return 0;
+ }
+ if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
+ ESP_LOGE(TAG, "read error :%d:", ret);
+ }
}
return ret;
}
void *addr_ptr;
if (res->ai_family == AF_INET) {
- struct sockaddr_in *p = (struct sockaddr_in *)res->ai_addr;
- p->sin_port = htons(port);
- addr_ptr = p;
+ struct sockaddr_in *p = (struct sockaddr_in *)res->ai_addr;
+ p->sin_port = htons(port);
+ addr_ptr = p;
} else if (res->ai_family == AF_INET6) {
- struct sockaddr_in6 *p = (struct sockaddr_in6 *)res->ai_addr;
- p->sin6_port = htons(port);
- p->sin6_family = AF_INET6;
- addr_ptr = p;
+ struct sockaddr_in6 *p = (struct sockaddr_in6 *)res->ai_addr;
+ p->sin6_port = htons(port);
+ p->sin6_family = AF_INET6;
+ addr_ptr = p;
} else {
/* Unsupported Protocol Family */
- goto err_freesocket;
+ goto err_freesocket;
}
ret = connect(fd, addr_ptr, res->ai_addrlen);
return -1;
}
+static void verify_certificate(esp_tls_t *tls)
+{
+ int flags;
+ char buf[100];
+ if ((flags = mbedtls_ssl_get_verify_result(&tls->ssl)) != 0) {
+ ESP_LOGI(TAG, "Failed to verify peer certificate!");
+ bzero(buf, sizeof(buf));
+ mbedtls_x509_crt_verify_info(buf, sizeof(buf), " ! ", flags);
+ ESP_LOGI(TAG, "verification info: %s", buf);
+ } else {
+ ESP_LOGI(TAG, "Certificate verified.");
+ }
+}
+
+static void mbedtls_cleanup(esp_tls_t *tls)
+{
+ if (!tls) {
+ return;
+ }
+
+ mbedtls_entropy_free(&tls->entropy);
+ mbedtls_ssl_config_free(&tls->conf);
+ mbedtls_ctr_drbg_free(&tls->ctr_drbg);
+ mbedtls_ssl_free(&tls->ssl);
+ mbedtls_net_free(&tls->server_fd);
+}
+
static int create_ssl_handle(esp_tls_t *tls, const char *hostname, size_t hostlen, const esp_tls_cfg_t *cfg)
{
int ret;
- const SSL_METHOD *method = cfg->ssl_method!= NULL ? cfg->ssl_method : TLSv1_2_client_method();
- SSL_CTX *ssl_ctx = SSL_CTX_new(method);
- if (!ssl_ctx) {
- return -1;
+ mbedtls_net_init(&tls->server_fd);
+ tls->server_fd.fd = tls->sockfd;
+ mbedtls_ssl_init(&tls->ssl);
+ mbedtls_ctr_drbg_init(&tls->ctr_drbg);
+ mbedtls_ssl_config_init(&tls->conf);
+ mbedtls_entropy_init(&tls->entropy);
+
+ if ((ret = mbedtls_ctr_drbg_seed(&tls->ctr_drbg,
+ mbedtls_entropy_func, &tls->entropy, NULL, 0)) != 0) {
+ ESP_LOGE(TAG, "mbedtls_ctr_drbg_seed returned %d", ret);
+ goto exit;
+ }
+
+ /* Hostname set here should match CN in server certificate */
+ char *use_host = strndup(hostname, hostlen);
+ if (!use_host) {
+ goto exit;
}
-#ifdef __APPLE__
- SSL_CTX_set_options(ssl_ctx, SSL_OP_ALL | SSL_OP_NO_SSLv2);
- SSL_CTX_set_mode(ssl_ctx, SSL_MODE_AUTO_RETRY);
- SSL_CTX_set_mode(ssl_ctx, SSL_MODE_RELEASE_BUFFERS);
-#endif
-
- if (cfg->cacert_pem_buf != NULL) {
- SSL_CTX_set_verify(ssl_ctx, SSL_VERIFY_PEER, NULL);
- BIO *bio;
- bio = BIO_new(BIO_s_mem());
- BIO_write(bio, cfg->cacert_pem_buf, cfg->cacert_pem_bytes);
+ if ((ret = mbedtls_ssl_set_hostname(&tls->ssl, use_host)) != 0) {
+ ESP_LOGE(TAG, "mbedtls_ssl_set_hostname returned -0x%x", -ret);
+ free(use_host);
+ goto exit;
+ }
+ free(use_host);
- X509 *ca = PEM_read_bio_X509(bio, NULL, 0, NULL);
+ if ((ret = mbedtls_ssl_config_defaults(&tls->conf,
+ MBEDTLS_SSL_IS_CLIENT,
+ MBEDTLS_SSL_TRANSPORT_STREAM,
+ MBEDTLS_SSL_PRESET_DEFAULT)) != 0) {
+ ESP_LOGE(TAG, "mbedtls_ssl_config_defaults returned %d", ret);
+ goto exit;
+ }
- if (!ca) {
- ESP_LOGE(TAG, "CA Error");
- X509_free(ca);
- BIO_free(bio);
- SSL_CTX_free(ssl_ctx);
- return -1;
+ if (cfg->cacert_pem_buf != NULL) {
+ mbedtls_x509_crt_init(&tls->cacert);
+ ret = mbedtls_x509_crt_parse(&tls->cacert, cfg->cacert_pem_buf, cfg->cacert_pem_bytes);
+ if (ret < 0) {
+ ESP_LOGE(TAG, "mbedtls_x509_crt_parse returned -0x%x\n\n", -ret);
+ goto exit;
}
- ESP_LOGD(TAG, "CA OK");
-
- X509_STORE_add_cert(SSL_CTX_get_cert_store(ssl_ctx), ca);
-
- X509_free(ca);
- BIO_free(bio);
+ mbedtls_ssl_conf_authmode(&tls->conf, MBEDTLS_SSL_VERIFY_REQUIRED);
+ mbedtls_ssl_conf_ca_chain(&tls->conf, &tls->cacert, NULL);
+ } else {
+ mbedtls_ssl_conf_authmode(&tls->conf, MBEDTLS_SSL_VERIFY_NONE);
}
+
+ mbedtls_ssl_conf_rng(&tls->conf, mbedtls_ctr_drbg_random, &tls->ctr_drbg);
- if (cfg->alpn_protos) {
- SSL_CTX_set_alpn_protos(ssl_ctx, cfg->alpn_protos, strlen((char *)cfg->alpn_protos));
- }
- SSL *ssl = SSL_new(ssl_ctx);
- if (!ssl) {
- SSL_CTX_free(ssl_ctx);
- return -1;
- }
+#ifdef CONFIG_MBEDTLS_DEBUG
+ mbedtls_esp_enable_debug_log(&tls->conf, 4);
+#endif
- char *use_host = strndup(hostname, hostlen);
- if (!use_host) {
- SSL_CTX_free(ssl_ctx);
- return -1;
+ if ((ret = mbedtls_ssl_setup(&tls->ssl, &tls->conf)) != 0) {
+ ESP_LOGE(TAG, "mbedtls_ssl_setup returned -0x%x\n\n", -ret);
+ goto exit;
}
- SSL_set_tlsext_host_name(ssl, use_host);
- free(use_host);
- SSL_set_fd(ssl, tls->sockfd);
- ret = SSL_connect(ssl);
- if (ret < 1) {
- ESP_LOGE(TAG, "SSL handshake failed");
- SSL_free(ssl);
- SSL_CTX_free(ssl_ctx);
- return -1;
- }
+ mbedtls_ssl_set_bio(&tls->ssl, &tls->server_fd, mbedtls_net_send, mbedtls_net_recv, NULL);
- tls->ctx = ssl_ctx;
- tls->ssl = ssl;
+ while ((ret = mbedtls_ssl_handshake(&tls->ssl)) != 0) {
+ if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
+ ESP_LOGE(TAG, "mbedtls_ssl_handshake returned -0x%x", -ret);
+ if (cfg->cacert_pem_buf != NULL) {
+ /* This is to check whether handshake failed due to invalid certificate*/
+ verify_certificate(tls);
+ }
+ goto exit;
+ }
+ }
+
return 0;
+exit:
+ mbedtls_cleanup(tls);
+ return -1;
}
/**
*/
void esp_tls_conn_delete(esp_tls_t *tls)
{
- if (!tls) {
- return;
- }
- if (tls->ssl) {
- SSL_free(tls->ssl);
- }
- if (tls->ctx) {
- SSL_CTX_free(tls->ctx);
- }
+ mbedtls_cleanup(tls);
if (tls->sockfd) {
close(tls->sockfd);
}
static ssize_t tls_write(esp_tls_t *tls, const char *data, size_t datalen)
{
- ssize_t ret = SSL_write(tls->ssl, data, datalen);
+ ssize_t ret = mbedtls_ssl_write(&tls->ssl, (unsigned char*) data, datalen);
if (ret < 0) {
- int err = SSL_get_error(tls->ssl, ret);
- if (err != SSL_ERROR_WANT_WRITE && err != SSL_ERROR_WANT_READ) {
- ESP_LOGE(TAG, "write error :%d:", ret);
- }
- return -err;
+ if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
+ ESP_LOGE(TAG, "write error :%d:", ret);
+ }
}
return ret;
}
tls->write = tls_write;
}
- if(cfg->non_block == true) {
+ if (cfg->non_block == true) {
int flags = fcntl(tls->sockfd, F_GETFL, 0);
fcntl(tls->sockfd, F_SETFL, flags | O_NONBLOCK);
}
#include <stdbool.h>
#include <sys/socket.h>
-#include <openssl/ssl.h>
#include <fcntl.h>
+
+#include "mbedtls/platform.h"
+#include "mbedtls/net_sockets.h"
+#include "mbedtls/esp_debug.h"
+#include "mbedtls/ssl.h"
+#include "mbedtls/entropy.h"
+#include "mbedtls/ctr_drbg.h"
+#include "mbedtls/error.h"
+#include "mbedtls/certs.h"
+
#ifdef __cplusplus
extern "C" {
#endif
"\x02h2"
- where the first '2' is the length of the protocol and
- the subsequent 'h2' is the protocol name */
+
const unsigned char *cacert_pem_buf; /*!< Certificate Authority's certificate in a buffer */
+
const unsigned int cacert_pem_bytes; /*!< Size of Certificate Authority certificate
pointed to by cacert_pem_buf */
- const SSL_METHOD *ssl_method; /*!< SSL method that describes internal ssl library
- methods/functions which implements the various protocol
- versions. If set to NULL, it defaults to
- method returned by TLSv1_2_client_method() API. */
+
bool non_block; /*!< Configure non-blocking mode. If set to true the
underneath socket will be configured in non
blocking mode after tls session is established */
* @brief ESP-TLS Connection Handle
*/
typedef struct esp_tls {
- SSL_CTX *ctx; /*!< SSL_CTX object is used to establish
- TLS/SSL enabled connection */
- SSL *ssl; /*!< SSL object which is needed to hold the data for a
- TLS/SSL connection. The new structure inherits the settings of the
- underlying context ctx: connection method (SSLv2/v3/TLSv1),
- options, verification settings, timeout settings. */
- int sockfd; /*!< Underlying socket file descriptor. */
+ mbedtls_ssl_context ssl; /*!< TLS/SSL context */
+
+ mbedtls_entropy_context entropy; /*!< mbedTLS entropy context structure */
+
+ mbedtls_ctr_drbg_context ctr_drbg; /*!< mbedTLS ctr drbg context structure.
+ CTR_DRBG is deterministic random
+ bit generation based on AES-256 */
+
+ mbedtls_ssl_config conf; /*!< TLS/SSL configuration to be shared
+ between mbedtls_ssl_context
+ structures */
+
+ mbedtls_net_context server_fd; /*!< mbedTLS wrapper type for sockets */
+
+ mbedtls_x509_crt cacert; /*!< Container for an X.509 certificate */
+
+ int sockfd; /*!< Underlying socket file descriptor. */
+
ssize_t (*read)(struct esp_tls *tls, char *data, size_t datalen); /*!< Callback function for reading data from TLS/SSL
connection. */
+
ssize_t (*write)(struct esp_tls *tls, const char *data, size_t datalen); /*!< Callback function for writing data to TLS/SSL
connection. */
} esp_tls_t;