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third/libcurl/docs/examples/usercertinmem.c

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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>
+
+static size_t write_cb(char *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;
+}