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/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
* SPDX-License-Identifier: curl
*
***************************************************************************/
/* <DESC>
* Use in-memory user certificate and private key and retrieve an HTTPS page.
* </DESC>
*/
/* Written by Ishan SinghLevett, based on Theo Borm's cacertinmem.c. Note that
* to maintain simplicity this example does not use a CA certificate for peer
* verification. Some form of peer verification must be used in real
* circumstances when a secure connection is required.
*/
/* Requires: USE_OPENSSL */
#include <openssl/ssl.h>
#include <stdio.h>
#include <curl/curl.h>
#if defined(__GNUC__) || defined(__clang__)
#pragma GCC diagnostic ignored "-Woverlength-strings"
#endif
static size_t write_cb(void *ptr, size_t size, size_t nmemb, void *stream)
{
fwrite(ptr, size, nmemb, (FILE *)stream);
return nmemb * size;
}
static CURLcode sslctx_function(CURL *curl, void *sslctx, void *pointer)
{
/** This example uses a (fake) certificate and private key **/
/* replace the XXX with the actual client/user certificate */
static const char mypem[] =
"-----BEGIN CERTIFICATE-----\n"
"XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"
"XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"
"XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"
"XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"
"XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"
"XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"
"XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"
"XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"
"-----END CERTIFICATE-----\n";
/* replace the XXX with the actual private key */
static const char mykey[] =
"-----BEGIN PRIVATE KEY-----\n"
"XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"
"XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"
"XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"
"-----END PRIVATE KEY-----\n";
CURLcode result = CURLE_ABORTED_BY_CALLBACK;
X509 *cert = NULL;
BIO *bio = NULL;
BIO *kbio = NULL;
EVP_PKEY *pkey = NULL;
int ret;
(void)curl;
(void)pointer;
/* get a BIO */
bio = BIO_new_mem_buf(mypem, sizeof(mypem) - 1);
if(!bio) {
printf("BIO_new_mem_buf() failed\n");
goto out;
}
/* use it to read the PEM formatted certificate from memory into an X509
structure that SSL can use. */
cert = PEM_read_bio_X509(bio, NULL, 0, NULL);
if(!cert) {
printf("PEM_read_bio_X509() failed\n");
goto out;
}
/* tell SSL to use the X509 certificate */
ret = SSL_CTX_use_certificate((SSL_CTX *)sslctx, cert);
if(ret != 1) {
printf("SSL_CTX_use_certificate() failed\n");
goto out;
}
/* create a bio for the private key */
kbio = BIO_new_mem_buf(mykey, sizeof(mykey) - 1);
if(!kbio) {
printf("BIO_new_mem_buf() failed\n");
goto out;
}
pkey = PEM_read_bio_PrivateKey(kbio, NULL, NULL, NULL);
if(!pkey) {
printf("PEM_read_bio_PrivateKey() failed\n");
goto out;
}
/* tell SSL to use the private key from memory */
ret = SSL_CTX_use_PrivateKey((SSL_CTX *)sslctx, pkey);
if(ret != 1) {
printf("SSL_CTX_use_PrivateKey() failed\n");
goto out;
}
result = CURLE_OK;
out:
/* free resources that have been allocated by OpenSSL functions */
if(bio)
BIO_free(bio);
if(kbio)
BIO_free(kbio);
if(pkey)
EVP_PKEY_free(pkey);
if(cert)
X509_free(cert);
/* all set to go */
return result;
}
int main(void)
{
CURL *curl;
CURLcode result = curl_global_init(CURL_GLOBAL_ALL);
if(result != CURLE_OK)
return (int)result;
curl = curl_easy_init();
if(curl) {
curl_easy_setopt(curl, CURLOPT_VERBOSE, 0L);
curl_easy_setopt(curl, CURLOPT_HEADER, 0L);
curl_easy_setopt(curl, CURLOPT_NOPROGRESS, 1L);
curl_easy_setopt(curl, CURLOPT_NOSIGNAL, 1L);
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_cb);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, stdout);
curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, write_cb);
curl_easy_setopt(curl, CURLOPT_HEADERDATA, stderr);
curl_easy_setopt(curl, CURLOPT_SSLCERTTYPE, "PEM");
/* both VERIFYPEER and VERIFYHOST are set to 0 in this case because there
is no CA certificate */
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
curl_easy_setopt(curl, CURLOPT_URL, "https://www.example.com/");
curl_easy_setopt(curl, CURLOPT_SSLKEYTYPE, "PEM");
/* first try: retrieve page without user certificate and key -> fails */
result = curl_easy_perform(curl);
if(result == CURLE_OK)
printf("*** transfer succeeded ***\n");
else
printf("*** transfer failed ***\n");
/* second try: retrieve page using user certificate and key -> succeeds to
* load the certificate and key by installing a function doing the
* necessary "modifications" to the SSL CONTEXT before link init
*/
curl_easy_setopt(curl, CURLOPT_SSL_CTX_FUNCTION, sslctx_function);
result = curl_easy_perform(curl);
if(result == CURLE_OK)
printf("*** transfer succeeded ***\n");
else
printf("*** transfer failed ***\n");
curl_easy_cleanup(curl);
}
curl_global_cleanup();
return (int)result;
}
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