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Merge branch 'feature/aws_iot_esp_tls' into 'master'

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Modify network wrapper from mbedtls to esp_tls

See merge request sdk/ESP8266_RTOS_SDK!724
This commit is contained in:
Dong Heng
2019-01-30 10:34:12 +08:00
parent 310fc6aa84 7929f7bf32
commit ea9c911e69
2 changed files with 54 additions and 282 deletions
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29
components/aws_iot/include/network_platform.h
View File

@ -16,27 +16,14 @@
#ifndef IOTSDKC_NETWORK_MBEDTLS_PLATFORM_H_H
#if !defined(MBEDTLS_CONFIG_FILE)
#include "mbedtls/config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif
#include "mbedtls/platform.h"
#include "mbedtls/net_sockets.h"
#include "mbedtls/ssl.h"
#include "mbedtls/entropy.h"
#include "mbedtls/ctr_drbg.h"
#include "mbedtls/certs.h"
#include "mbedtls/x509.h"
#include "mbedtls/error.h"
#include "mbedtls/debug.h"
#include "mbedtls/timing.h"
#include <stdint.h>
#ifdef __cplusplus
extern "C" {
#endif
typedef size_t esp_network_handle_t;
/**
* @brief TLS Connection Parameters
*
@ -44,15 +31,9 @@ extern "C" {
* TLS networking layer to create a TLS secured socket.
*/
typedef struct _TLSDataParams {
mbedtls_entropy_context entropy;
mbedtls_ctr_drbg_context ctr_drbg;
mbedtls_ssl_context ssl;
mbedtls_ssl_config conf;
esp_network_handle_t handle;
uint32_t flags;
mbedtls_x509_crt cacert;
mbedtls_x509_crt clicert;
mbedtls_pk_context pkey;
mbedtls_net_context server_fd;
uint32_t timeout;
}TLSDataParams;
#define IOTSDKC_NETWORK_MBEDTLS_PLATFORM_H_H

307
components/aws_iot/port/network_mbedtls_wrapper.c
View File

@ -17,51 +17,22 @@
#include <stdbool.h>
#include <string.h>
#include <timer_platform.h>
#include <network_interface.h>
#include "aws_iot_config.h"
#include "aws_iot_error.h"
#include "network_interface.h"
#include "network_platform.h"
#include "mbedtls/esp_debug.h"
#include "esp_log.h"
#include "esp_system.h"
#ifdef CONFIG_USE_VFS
#include "esp_vfs.h"
#endif
#include "esp_tls.h"
static const char *TAG = "aws_iot";
/* This is the value used for ssl read timeout */
#define IOT_SSL_READ_TIMEOUT 10
/*
* This is a function to do further verification if needed on the cert received.
*
* Currently used to print debug-level information about each cert.
*/
static int _iot_tls_verify_cert(void *data, mbedtls_x509_crt *crt, int depth, uint32_t *flags) {
char buf[256];
((void) data);
if (LOG_LOCAL_LEVEL >= ESP_LOG_DEBUG) {
ESP_LOGD(TAG, "Verify requested for (Depth %d):", depth);
mbedtls_x509_crt_info(buf, sizeof(buf) - 1, "", crt);
ESP_LOGD(TAG, "%s", buf);
if((*flags) == 0) {
ESP_LOGD(TAG, " This certificate has no flags");
} else {
ESP_LOGD(TAG, "Verify result:%s", buf);
}
}
return 0;
}
static void _iot_tls_set_connect_params(Network *pNetwork, const char *pRootCALocation, const char *pDeviceCertLocation,
const char *pDevicePrivateKeyLocation, const char *pDestinationURL,
uint16_t destinationPort, uint32_t timeout_ms, bool ServerVerificationFlag) {
@ -100,8 +71,6 @@ IoT_Error_t iot_tls_is_connected(Network *pNetwork) {
IoT_Error_t iot_tls_connect(Network *pNetwork, TLSConnectParams *params) {
int ret = SUCCESS;
TLSDataParams *tlsDataParams = NULL;
char portBuffer[6];
char info_buf[256];
if(NULL == pNetwork) {
return NULL_VALUE_ERROR;
@ -115,219 +84,36 @@ IoT_Error_t iot_tls_connect(Network *pNetwork, TLSConnectParams *params) {
tlsDataParams = &(pNetwork->tlsDataParams);
mbedtls_net_init(&(tlsDataParams->server_fd));
mbedtls_ssl_init(&(tlsDataParams->ssl));
mbedtls_ssl_config_init(&(tlsDataParams->conf));
#ifdef CONFIG_MBEDTLS_DEBUG
mbedtls_esp_enable_debug_log(&(tlsDataParams->conf), 4);
#endif
mbedtls_ctr_drbg_init(&(tlsDataParams->ctr_drbg));
mbedtls_x509_crt_init(&(tlsDataParams->cacert));
mbedtls_x509_crt_init(&(tlsDataParams->clicert));
mbedtls_pk_init(&(tlsDataParams->pkey));
ESP_LOGD(TAG, "Seeding the random number generator...");
mbedtls_entropy_init(&(tlsDataParams->entropy));
if((ret = mbedtls_ctr_drbg_seed(&(tlsDataParams->ctr_drbg), mbedtls_entropy_func, &(tlsDataParams->entropy),
(const unsigned char *) TAG, strlen(TAG))) != 0) {
ESP_LOGE(TAG, "failed! mbedtls_ctr_drbg_seed returned -0x%x", -ret);
return NETWORK_MBEDTLS_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED;
}
/* Load root CA...
Certs/keys can be paths or they can be raw data. These use a
very basic heuristic: if the cert starts with '/' then it's a
path, if it's longer than this then it's raw cert data (PEM or DER,
neither of which can start with a slash. */
if (pNetwork->tlsConnectParams.pRootCALocation[0] == '/') {
#ifdef CONFIG_USE_VFS
ESP_LOGD(TAG, "Loading CA root certificate from file ...");
ret = mbedtls_x509_crt_parse_file(&(tlsDataParams->cacert), pNetwork->tlsConnectParams.pRootCALocation);
#else
ESP_LOGE(TAG, "Not to support load CA root certificate from file ...");
return NETWORK_SSL_CERT_ERROR;
#endif
} else {
ESP_LOGD(TAG, "Loading embedded CA root certificate ...");
ret = mbedtls_x509_crt_parse(&(tlsDataParams->cacert), (const unsigned char *)pNetwork->tlsConnectParams.pRootCALocation,
strlen(pNetwork->tlsConnectParams.pRootCALocation)+1);
}
if(ret < 0) {
ESP_LOGE(TAG, "failed! mbedtls_x509_crt_parse returned -0x%x while parsing root cert", -ret);
return NETWORK_X509_ROOT_CRT_PARSE_ERROR;
}
ESP_LOGD(TAG, "ok (%d skipped)", ret);
/* Load client certificate... */
if (pNetwork->tlsConnectParams.pDeviceCertLocation[0] == '/') {
#ifdef CONFIG_USE_VFS
ESP_LOGD(TAG, "Loading client cert from file...");
ret = mbedtls_x509_crt_parse_file(&(tlsDataParams->clicert),
pNetwork->tlsConnectParams.pDeviceCertLocation);
#else
ESP_LOGE(TAG, "Not support to load client cert from file...");
return NETWORK_SSL_CERT_ERROR;
#endif
} else {
ESP_LOGD(TAG, "Loading embedded client certificate...");
ret = mbedtls_x509_crt_parse(&(tlsDataParams->clicert),
(const unsigned char *)pNetwork->tlsConnectParams.pDeviceCertLocation,
strlen(pNetwork->tlsConnectParams.pDeviceCertLocation)+1);
}
if(ret != 0) {
ESP_LOGE(TAG, "failed! mbedtls_x509_crt_parse returned -0x%x while parsing device cert", -ret);
return NETWORK_X509_DEVICE_CRT_PARSE_ERROR;
}
/* Parse client private key... */
if (pNetwork->tlsConnectParams.pDevicePrivateKeyLocation[0] == '/') {
#ifdef CONFIG_USE_VFS
ESP_LOGD(TAG, "Loading client private key from file...");
ret = mbedtls_pk_parse_keyfile(&(tlsDataParams->pkey),
pNetwork->tlsConnectParams.pDevicePrivateKeyLocation,
"");
#else
ESP_LOGE(TAG, "Not support to load client private key from file...");
return NETWORK_SSL_CERT_ERROR;
#endif
} else {
ESP_LOGD(TAG, "Loading embedded client private key...");
ret = mbedtls_pk_parse_key(&(tlsDataParams->pkey),
(const unsigned char *)pNetwork->tlsConnectParams.pDevicePrivateKeyLocation,
strlen(pNetwork->tlsConnectParams.pDevicePrivateKeyLocation)+1,
(const unsigned char *)"", 0);
}
if(ret != 0) {
ESP_LOGE(TAG, "failed! mbedtls_pk_parse_key returned -0x%x while parsing private key", -ret);
return NETWORK_PK_PRIVATE_KEY_PARSE_ERROR;
}
/* Done parsing certs */
ESP_LOGD(TAG, "ok");
snprintf(portBuffer, 6, "%d", pNetwork->tlsConnectParams.DestinationPort);
ESP_LOGD(TAG, "Connecting to %s/%s...", pNetwork->tlsConnectParams.pDestinationURL, portBuffer);
if((ret = mbedtls_net_connect(&(tlsDataParams->server_fd), pNetwork->tlsConnectParams.pDestinationURL,
portBuffer, MBEDTLS_NET_PROTO_TCP)) != 0) {
ESP_LOGE(TAG, "failed! mbedtls_net_connect returned -0x%x", -ret);
switch(ret) {
case MBEDTLS_ERR_NET_SOCKET_FAILED:
return NETWORK_ERR_NET_SOCKET_FAILED;
case MBEDTLS_ERR_NET_UNKNOWN_HOST:
return NETWORK_ERR_NET_UNKNOWN_HOST;
case MBEDTLS_ERR_NET_CONNECT_FAILED:
default:
return NETWORK_ERR_NET_CONNECT_FAILED;
};
}
ret = mbedtls_net_set_block(&(tlsDataParams->server_fd));
if(ret != 0) {
ESP_LOGE(TAG, "failed! net_set_(non)block() returned -0x%x", -ret);
return SSL_CONNECTION_ERROR;
} ESP_LOGD(TAG, "ok");
ESP_LOGD(TAG, "Setting up the SSL/TLS structure...");
if((ret = mbedtls_ssl_config_defaults(&(tlsDataParams->conf), MBEDTLS_SSL_IS_CLIENT, MBEDTLS_SSL_TRANSPORT_STREAM,
MBEDTLS_SSL_PRESET_DEFAULT)) != 0) {
ESP_LOGE(TAG, "failed! mbedtls_ssl_config_defaults returned -0x%x", -ret);
return SSL_CONNECTION_ERROR;
}
mbedtls_ssl_conf_verify(&(tlsDataParams->conf), _iot_tls_verify_cert, NULL);
if(pNetwork->tlsConnectParams.ServerVerificationFlag == true) {
mbedtls_ssl_conf_authmode(&(tlsDataParams->conf), MBEDTLS_SSL_VERIFY_REQUIRED);
} else {
mbedtls_ssl_conf_authmode(&(tlsDataParams->conf), MBEDTLS_SSL_VERIFY_OPTIONAL);
}
mbedtls_ssl_conf_rng(&(tlsDataParams->conf), mbedtls_ctr_drbg_random, &(tlsDataParams->ctr_drbg));
mbedtls_ssl_conf_ca_chain(&(tlsDataParams->conf), &(tlsDataParams->cacert), NULL);
ret = mbedtls_ssl_conf_own_cert(&(tlsDataParams->conf), &(tlsDataParams->clicert), &(tlsDataParams->pkey));
if(ret != 0) {
ESP_LOGE(TAG, "failed! mbedtls_ssl_conf_own_cert returned %d", ret);
return SSL_CONNECTION_ERROR;
}
mbedtls_ssl_conf_read_timeout(&(tlsDataParams->conf), pNetwork->tlsConnectParams.timeout_ms);
esp_tls_cfg_t cfg = {
.cacert_pem_buf = (const unsigned char *)pNetwork->tlsConnectParams.pRootCALocation,
.cacert_pem_bytes = strlen(pNetwork->tlsConnectParams.pRootCALocation) + 1,
.clientcert_pem_buf = (const unsigned char *)pNetwork->tlsConnectParams.pDeviceCertLocation,
.clientcert_pem_bytes = strlen(pNetwork->tlsConnectParams.pDeviceCertLocation) + 1,
.clientkey_pem_buf = (const unsigned char *)pNetwork->tlsConnectParams.pDevicePrivateKeyLocation,
.clientkey_pem_bytes = strlen(pNetwork->tlsConnectParams.pDevicePrivateKeyLocation) + 1,
.timeout_ms = pNetwork->tlsConnectParams.timeout_ms,
.non_block = true
};
/* Use the AWS IoT ALPN extension for MQTT, if port 443 is requested */
if (pNetwork->tlsConnectParams.DestinationPort == 443) {
const char *alpnProtocols[] = { "x-amzn-mqtt-ca", NULL };
if ((ret = mbedtls_ssl_conf_alpn_protocols(&(tlsDataParams->conf), alpnProtocols)) != 0) {
ESP_LOGE(TAG, "failed! mbedtls_ssl_conf_alpn_protocols returned -0x%x", -ret);
return SSL_CONNECTION_ERROR;
}
cfg.alpn_protos = alpnProtocols;
}
if((ret = mbedtls_ssl_setup(&(tlsDataParams->ssl), &(tlsDataParams->conf))) != 0) {
ESP_LOGE(TAG, "failed! mbedtls_ssl_setup returned -0x%x", -ret);
return SSL_CONNECTION_ERROR;
}
if((ret = mbedtls_ssl_set_hostname(&(tlsDataParams->ssl), pNetwork->tlsConnectParams.pDestinationURL)) != 0) {
ESP_LOGE(TAG, "failed! mbedtls_ssl_set_hostname returned %d", ret);
return SSL_CONNECTION_ERROR;
}
ESP_LOGD(TAG, "SSL state connect : %d ", tlsDataParams->ssl.state);
mbedtls_ssl_set_bio(&(tlsDataParams->ssl), &(tlsDataParams->server_fd), mbedtls_net_send, NULL,
mbedtls_net_recv_timeout);
ESP_LOGD(TAG, "ok");
ESP_LOGD(TAG, "SSL state connect : %d ", tlsDataParams->ssl.state);
ESP_LOGD(TAG, "Performing the SSL/TLS handshake...");
rtc_clk_cpu_freq_set(RTC_CPU_FREQ_160M);
while((ret = mbedtls_ssl_handshake(&(tlsDataParams->ssl))) != 0) {
if(ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
rtc_clk_cpu_freq_set(RTC_CPU_FREQ_80M);
ESP_LOGE(TAG, "failed! mbedtls_ssl_handshake returned -0x%x", -ret);
if(ret == MBEDTLS_ERR_X509_CERT_VERIFY_FAILED) {
ESP_LOGE(TAG, " Unable to verify the server's certificate. ");
}
return SSL_CONNECTION_ERROR;
}
struct esp_tls *tls = esp_tls_conn_new(pNetwork->tlsConnectParams.pDestinationURL, strlen(pNetwork->tlsConnectParams.pDestinationURL), pNetwork->tlsConnectParams.DestinationPort, &cfg);
if (!tls) {
ret = SSL_CONNECTION_ERROR;
}
tlsDataParams->timeout = pNetwork->tlsConnectParams.timeout_ms;
tlsDataParams->handle = (esp_network_handle_t)tls;
rtc_clk_cpu_freq_set(RTC_CPU_FREQ_80M);
ESP_LOGD(TAG, "ok [ Protocol is %s ] [ Ciphersuite is %s ]", mbedtls_ssl_get_version(&(tlsDataParams->ssl)),
mbedtls_ssl_get_ciphersuite(&(tlsDataParams->ssl)));
if((ret = mbedtls_ssl_get_record_expansion(&(tlsDataParams->ssl))) >= 0) {
ESP_LOGD(TAG, " [ Record expansion is %d ]", ret);
} else {
ESP_LOGD(TAG, " [ Record expansion is unknown (compression) ]");
}
ESP_LOGD(TAG, "Verifying peer X.509 certificate...");
if(pNetwork->tlsConnectParams.ServerVerificationFlag == true) {
if((tlsDataParams->flags = mbedtls_ssl_get_verify_result(&(tlsDataParams->ssl))) != 0) {
ESP_LOGE(TAG, "failed");
mbedtls_x509_crt_verify_info(info_buf, sizeof(info_buf), " ! ", tlsDataParams->flags);
ESP_LOGE(TAG, "%s", info_buf);
ret = SSL_CONNECTION_ERROR;
} else {
ESP_LOGD(TAG, "ok");
ret = SUCCESS;
}
} else {
ESP_LOGW(TAG, " Server Verification skipped");
ret = SUCCESS;
}
if(LOG_LOCAL_LEVEL >= ESP_LOG_DEBUG) {
if (mbedtls_ssl_get_peer_cert(&(tlsDataParams->ssl)) != NULL) {
ESP_LOGD(TAG, "Peer certificate information:");
mbedtls_x509_crt_info((char *) info_buf, sizeof(info_buf) - 1, " ", mbedtls_ssl_get_peer_cert(&(tlsDataParams->ssl)));
ESP_LOGD(TAG, "%s", info_buf);
}
}
return (IoT_Error_t) ret;
}
@ -336,11 +122,15 @@ IoT_Error_t iot_tls_write(Network *pNetwork, unsigned char *pMsg, size_t len, Ti
bool isErrorFlag = false;
int frags, ret = 0;
TLSDataParams *tlsDataParams = &(pNetwork->tlsDataParams);
struct esp_tls *tls = (struct esp_tls *)tlsDataParams->handle;
if (!tls) {
return NULL_VALUE_ERROR;
}
for(written_so_far = 0, frags = 0;
written_so_far < len && !has_timer_expired(timer); written_so_far += ret, frags++) {
while(!has_timer_expired(timer) &&
(ret = mbedtls_ssl_write(&(tlsDataParams->ssl), pMsg + written_so_far, len - written_so_far)) <= 0) {
(ret = esp_tls_conn_write(tls, pMsg + written_so_far, len - written_so_far)) <= 0) {
if(ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
ESP_LOGE(TAG, "failed! mbedtls_ssl_write returned -0x%x", -ret);
/* All other negative return values indicate connection needs to be reset.
@ -367,24 +157,27 @@ IoT_Error_t iot_tls_write(Network *pNetwork, unsigned char *pMsg, size_t len, Ti
IoT_Error_t iot_tls_read(Network *pNetwork, unsigned char *pMsg, size_t len, Timer *timer, size_t *read_len) {
TLSDataParams *tlsDataParams = &(pNetwork->tlsDataParams);
mbedtls_ssl_context *ssl = &(tlsDataParams->ssl);
mbedtls_ssl_config *ssl_conf = &(tlsDataParams->conf);
uint32_t read_timeout;
struct esp_tls *tls = (struct esp_tls *)tlsDataParams->handle;
uint32_t read_timeout = tlsDataParams->timeout;
size_t rxLen = 0;
int ret;
read_timeout = ssl_conf->read_timeout;
struct timeval timeout;
if (!tls) {
return NULL_VALUE_ERROR;
}
while (len > 0) {
/* Make sure we never block on read for longer than timer has left,
but also that we don't block indefinitely (ie read_timeout > 0) */
mbedtls_ssl_conf_read_timeout(ssl_conf, MAX(1, MIN(read_timeout, left_ms(timer))));
but also that we don't block indefinitely (ie read_timeout > 0) */
read_timeout = MAX(1, MIN(read_timeout, left_ms(timer)));
timeout.tv_sec = read_timeout / 1000;
timeout.tv_usec = (read_timeout % 1000) * 1000;
ret = mbedtls_ssl_read(ssl, pMsg, len);
ret = setsockopt(tls->sockfd, SOL_SOCKET, SO_RCVTIMEO, (char *)&timeout, sizeof(struct timeval));
ret = esp_tls_conn_read(tls, pMsg, len);
/* Restore the old timeout */
mbedtls_ssl_conf_read_timeout(ssl_conf, read_timeout);
tlsDataParams->timeout = read_timeout;
if (ret > 0) {
rxLen += ret;
@ -413,11 +206,13 @@ IoT_Error_t iot_tls_read(Network *pNetwork, unsigned char *pMsg, size_t len, Tim
}
IoT_Error_t iot_tls_disconnect(Network *pNetwork) {
mbedtls_ssl_context *ssl = &(pNetwork->tlsDataParams.ssl);
int ret = 0;
do {
ret = mbedtls_ssl_close_notify(ssl);
} while(ret == MBEDTLS_ERR_SSL_WANT_WRITE);
TLSDataParams *tlsDataParams = &(pNetwork->tlsDataParams);
struct esp_tls *tls = (struct esp_tls *)tlsDataParams->handle;
if (!tls) {
return NULL_VALUE_ERROR;
}
esp_tls_conn_delete(tls);
/* All other negative return values indicate connection needs to be reset.
* No further action required since this is disconnect call */
@ -427,16 +222,12 @@ IoT_Error_t iot_tls_disconnect(Network *pNetwork) {
IoT_Error_t iot_tls_destroy(Network *pNetwork) {
TLSDataParams *tlsDataParams = &(pNetwork->tlsDataParams);
struct esp_tls *tls = (struct esp_tls *)tlsDataParams->handle;
if (!tls) {
return NULL_VALUE_ERROR;
}
mbedtls_net_free(&(tlsDataParams->server_fd));
mbedtls_x509_crt_free(&(tlsDataParams->clicert));
mbedtls_x509_crt_free(&(tlsDataParams->cacert));
mbedtls_pk_free(&(tlsDataParams->pkey));
mbedtls_ssl_free(&(tlsDataParams->ssl));
mbedtls_ssl_config_free(&(tlsDataParams->conf));
mbedtls_ctr_drbg_free(&(tlsDataParams->ctr_drbg));
mbedtls_entropy_free(&(tlsDataParams->entropy));
esp_tls_conn_delete(tls);
return SUCCESS;
}