esp-idf/components/esp_http_client/lib/http_auth.c

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// Copyright 2015-2018 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <stdarg.h>
#include "esp_netif.h"
#include "lwip/sockets.h"
#include "esp_rom_md5.h"
#include "esp_tls_crypto.h"
#include "esp_system.h"
#include "esp_log.h"
#include "http_utils.h"
#include "http_auth.h"
#define MD5_MAX_LEN (33)
#define HTTP_AUTH_BUF_LEN (1024)
static const char *TAG = "HTTP_AUTH";
/**
* @brief This function hash a formatted string with MD5 and format the result as ascii characters
*
* @param md The buffer will hold the ascii result
* @param[in] fmt The format
*
* @return Length of the result
*/
static int md5_printf(char *md, const char *fmt, ...)
{
unsigned char *buf;
unsigned char digest[MD5_MAX_LEN];
int len, i;
struct MD5Context md5_ctx;
va_list ap;
va_start(ap, fmt);
len = vasprintf((char **)&buf, fmt, ap);
if (buf == NULL) {
return ESP_FAIL;
}
esp_rom_md5_init(&md5_ctx);
esp_rom_md5_update(&md5_ctx, buf, len);
esp_rom_md5_final(digest, &md5_ctx);
for (i = 0; i < 16; ++i) {
sprintf(&md[i * 2], "%02x", (unsigned int)digest[i]);
}
va_end(ap);
free(buf);
return MD5_MAX_LEN;
}
char *http_auth_digest(const char *username, const char *password, esp_http_auth_data_t *auth_data)
{
char *ha1, *ha2 = NULL;
char *digest = NULL;
char *auth_str = NULL;
char *temp_auth_str = NULL;
if (username == NULL ||
password == NULL ||
auth_data->nonce == NULL ||
auth_data->uri == NULL ||
auth_data->realm == NULL) {
return NULL;
}
ha1 = calloc(1, MD5_MAX_LEN);
HTTP_MEM_CHECK(TAG, ha1, goto _digest_exit);
ha2 = calloc(1, MD5_MAX_LEN);
HTTP_MEM_CHECK(TAG, ha2, goto _digest_exit);
digest = calloc(1, MD5_MAX_LEN);
HTTP_MEM_CHECK(TAG, digest, goto _digest_exit);
if (md5_printf(ha1, "%s:%s:%s", username, auth_data->realm, password) <= 0) {
goto _digest_exit;
}
ESP_LOGD(TAG, "%s %s %s %s\r\n", "Digest", username, auth_data->realm, password);
if (strcasecmp(auth_data->algorithm, "md5-sess") == 0) {
if (md5_printf(ha1, "%s:%s:%016llx", ha1, auth_data->nonce, auth_data->cnonce) <= 0) {
goto _digest_exit;
}
}
if (md5_printf(ha2, "%s:%s", auth_data->method, auth_data->uri) <= 0) {
goto _digest_exit;
}
//support qop = auth
if (auth_data->qop && strcasecmp(auth_data->qop, "auth-int") == 0) {
if (md5_printf(ha2, "%s:%s", ha2, "entity") <= 0) {
goto _digest_exit;
}
}
if (auth_data->qop) {
// response=MD5(HA1:nonce:nonceCount:cnonce:qop:HA2)
if (md5_printf(digest, "%s:%s:%08x:%016llx:%s:%s", ha1, auth_data->nonce, auth_data->nc, auth_data->cnonce, auth_data->qop, ha2) <= 0) {
goto _digest_exit;
}
} else {
// response=MD5(HA1:nonce:HA2)
if (md5_printf(digest, "%s:%s:%s", ha1, auth_data->nonce, ha2) <= 0) {
goto _digest_exit;
}
}
asprintf(&auth_str, "Digest username=\"%s\", realm=\"%s\", nonce=\"%s\", uri=\"%s\", algorithm=\"MD5\", "
"response=\"%s\", qop=%s, nc=%08x, cnonce=\"%016llx\"",
username, auth_data->realm, auth_data->nonce, auth_data->uri, digest, auth_data->qop, auth_data->nc, auth_data->cnonce);
if (auth_data->opaque) {
asprintf(&temp_auth_str, "%s, opaque=\"%s\"", auth_str, auth_data->opaque);
free(auth_str);
auth_str = temp_auth_str;
}
_digest_exit:
free(ha1);
free(ha2);
free(digest);
return auth_str;
}
char *http_auth_basic(const char *username, const char *password)
{
int out;
char *user_info = NULL;
char *digest = NULL;
size_t n = 0;
asprintf(&user_info, "%s:%s", username, password);
HTTP_MEM_CHECK(TAG, user_info, return NULL);
esp_crypto_base64_encode(NULL, 0, &n, (const unsigned char *)user_info, strlen(user_info));
digest = calloc(1, 6 + n + 1);
HTTP_MEM_CHECK(TAG, digest, goto _basic_exit);
strcpy(digest, "Basic ");
esp_crypto_base64_encode((unsigned char *)digest + 6, n, (size_t *)&out, (const unsigned char *)user_info, strlen(user_info));
_basic_exit:
free(user_info);
return digest;
}