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feature: Added user callback for esp_https_server

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- Can be used to get connection or client information (SSL context)
- E.g. Client certificate, Socket FD, Connection state, etc.
- Added example callback for getting client certificate information in 'https_server/simple' example

Closes https://github.com/espressif/esp-idf/issues/7479
This commit is contained in:
Laukik Hase
2021-10-08 14:19:57 +05:30
parent 8c3287e0db
commit 1d2b2b5879
8 changed files with 157 additions and 17 deletions
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37
examples/protocols/https_server/simple/main/main.c
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@@ -18,6 +18,7 @@
#include "protocol_examples_common.h"
#include <esp_https_server.h>
#include "esp_tls.h"
/* A simple example that demonstrates how to create GET and POST
* handlers and start an HTTPS server.
@@ -25,7 +26,6 @@
static const char *TAG = "example";
/* An HTTP GET handler */
static esp_err_t root_get_handler(httpd_req_t *req)
{
@@ -35,13 +35,43 @@ static esp_err_t root_get_handler(httpd_req_t *req)
return ESP_OK;
}
#if CONFIG_EXAMPLE_ENABLE_HTTPS_USER_CALLBACK
/**
* Example callback function to get the certificate of connected clients,
* whenever a new SSL connection is created
*
* Can also be used to other information like Socket FD, Connection state, etc.
*/
void https_server_user_callback(esp_https_server_user_cb_arg_t *user_cb)
{
ESP_LOGI(TAG, "Session Created!");
const mbedtls_x509_crt *cert;
const size_t buf_size = 1024;
char *buf = calloc(buf_size, sizeof(char));
if (buf == NULL) {
ESP_LOGE(TAG, "Out of memory - Callback execution failed!");
return;
}
cert = mbedtls_ssl_get_peer_cert(&user_cb->tls->ssl);
if (cert != NULL) {
mbedtls_x509_crt_info((char *) buf, buf_size - 1, " ", cert);
ESP_LOGI(TAG, "Peer certificate info:\n%s", buf);
} else {
ESP_LOGW(TAG, "Could not obtain the peer certificate!");
}
free(buf);
}
#endif
static const httpd_uri_t root = {
.uri = "/",
.method = HTTP_GET,
.handler = root_get_handler
};
static httpd_handle_t start_webserver(void)
{
httpd_handle_t server = NULL;
@@ -61,6 +91,9 @@ static httpd_handle_t start_webserver(void)
conf.prvtkey_pem = prvtkey_pem_start;
conf.prvtkey_len = prvtkey_pem_end - prvtkey_pem_start;
#if CONFIG_EXAMPLE_ENABLE_HTTPS_USER_CALLBACK
conf.user_cb = https_server_user_callback;
#endif
esp_err_t ret = httpd_ssl_start(&server, &conf);
if (ESP_OK != ret) {
ESP_LOGI(TAG, "Error starting server!");