1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
9 *
10 * This software is licensed as described in the file COPYING, which
11 * you should have received as part of this distribution. The terms
12 * are also available at https://curl.se/docs/copyright.html.
13 *
14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
15 * copies of the Software, and permit persons to whom the Software is
16 * furnished to do so, under the terms of the COPYING file.
17 *
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
20 *
21 * SPDX-License-Identifier: curl
22 *
23 ***************************************************************************/
24 /* <DESC>
25 * Shows HTTPS usage with client certs and optional ssl engine use.
26 * </DESC>
27 */
28 #include <stdio.h>
29
30 #include <curl/curl.h>
31
32 /* some requirements for this to work:
33 1. set pCertFile to the file with the client certificate
34 2. if the key is passphrase protected, set pPassphrase to the
35 passphrase you use
36 3. if you are using a crypto engine:
37 3.1. set a #define USE_ENGINE
38 3.2. set pEngine to the name of the crypto engine you use
39 3.3. set pKeyName to the key identifier you want to use
40 4. if you do not use a crypto engine:
41 4.1. set pKeyName to the filename of your client key
42 4.2. if the format of the key file is DER, set pKeyType to "DER"
43
44 !! verify of the server certificate is not implemented here !!
45
46 **** This example only works with libcurl 7.9.3 and later! ****
47
48 */
49
main(void)50 int main(void)
51 {
52 CURL *curl;
53 CURLcode res;
54 FILE *headerfile;
55 const char *pPassphrase = NULL;
56
57 static const char *pCertFile = "testcert.pem";
58 static const char *pCACertFile = "cacert.pem";
59 static const char *pHeaderFile = "dumpit";
60
61 const char *pKeyName;
62 const char *pKeyType;
63
64 const char *pEngine;
65
66 #ifdef USE_ENGINE
67 pKeyName = "rsa_test";
68 pKeyType = "ENG";
69 pEngine = "chil"; /* for nChiper HSM... */
70 #else
71 pKeyName = "testkey.pem";
72 pKeyType = "PEM";
73 pEngine = NULL;
74 #endif
75
76 headerfile = fopen(pHeaderFile, "wb");
77
78 curl_global_init(CURL_GLOBAL_DEFAULT);
79
80 curl = curl_easy_init();
81 if(curl) {
82 /* what call to write: */
83 curl_easy_setopt(curl, CURLOPT_URL, "HTTPS://your.favourite.ssl.site");
84 curl_easy_setopt(curl, CURLOPT_HEADERDATA, headerfile);
85
86 do { /* dummy loop, just to break out from */
87 if(pEngine) {
88 /* use crypto engine */
89 if(curl_easy_setopt(curl, CURLOPT_SSLENGINE, pEngine) != CURLE_OK) {
90 /* load the crypto engine */
91 fprintf(stderr, "cannot set crypto engine\n");
92 break;
93 }
94 if(curl_easy_setopt(curl, CURLOPT_SSLENGINE_DEFAULT, 1L) != CURLE_OK) {
95 /* set the crypto engine as default */
96 /* only needed for the first time you load
97 an engine in a curl object... */
98 fprintf(stderr, "cannot set crypto engine as default\n");
99 break;
100 }
101 }
102 /* cert is stored PEM coded in file... */
103 /* since PEM is default, we needn't set it for PEM */
104 curl_easy_setopt(curl, CURLOPT_SSLCERTTYPE, "PEM");
105
106 /* set the cert for client authentication */
107 curl_easy_setopt(curl, CURLOPT_SSLCERT, pCertFile);
108
109 /* sorry, for engine we must set the passphrase
110 (if the key has one...) */
111 if(pPassphrase)
112 curl_easy_setopt(curl, CURLOPT_KEYPASSWD, pPassphrase);
113
114 /* if we use a key stored in a crypto engine,
115 we must set the key type to "ENG" */
116 curl_easy_setopt(curl, CURLOPT_SSLKEYTYPE, pKeyType);
117
118 /* set the private key (file or ID in engine) */
119 curl_easy_setopt(curl, CURLOPT_SSLKEY, pKeyName);
120
121 /* set the file with the certs validating the server */
122 curl_easy_setopt(curl, CURLOPT_CAINFO, pCACertFile);
123
124 /* disconnect if we cannot validate server's cert */
125 curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 1L);
126
127 /* Perform the request, res gets the return code */
128 res = curl_easy_perform(curl);
129 /* Check for errors */
130 if(res != CURLE_OK)
131 fprintf(stderr, "curl_easy_perform() failed: %s\n",
132 curl_easy_strerror(res));
133
134 /* we are done... */
135 } while(0);
136 /* always cleanup */
137 curl_easy_cleanup(curl);
138 }
139
140 curl_global_cleanup();
141
142 return 0;
143 }
144
