1 /***************************************************************************
2 * _ _ ____ _
3 * Project ___| | | | _ \| |
4 * / __| | | | |_) | |
5 * | (__| |_| | _ <| |___
6 * \___|\___/|_| \_\_____|
7 *
8 * Copyright (C) 1998 - 2017, 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.haxx.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 ***************************************************************************/
22 /* <DESC>
23 * Shows HTTPS usage with client certs and optional ssl engine use.
24 * </DESC>
25 */
26 #include <stdio.h>
27
28 #include <curl/curl.h>
29
30 /* some requirements for this to work:
31 1. set pCertFile to the file with the client certificate
32 2. if the key is passphrase protected, set pPassphrase to the
33 passphrase you use
34 3. if you are using a crypto engine:
35 3.1. set a #define USE_ENGINE
36 3.2. set pEngine to the name of the crypto engine you use
37 3.3. set pKeyName to the key identifier you want to use
38 4. if you don't use a crypto engine:
39 4.1. set pKeyName to the file name of your client key
40 4.2. if the format of the key file is DER, set pKeyType to "DER"
41
42 !! verify of the server certificate is not implemented here !!
43
44 **** This example only works with libcurl 7.9.3 and later! ****
45
46 */
47
main(void)48 int main(void)
49 {
50 CURL *curl;
51 CURLcode res;
52 FILE *headerfile;
53 const char *pPassphrase = NULL;
54
55 static const char *pCertFile = "testcert.pem";
56 static const char *pCACertFile = "cacert.pem";
57 static const char *pHeaderFile = "dumpit";
58
59 const char *pKeyName;
60 const char *pKeyType;
61
62 const char *pEngine;
63
64 #ifdef USE_ENGINE
65 pKeyName = "rsa_test";
66 pKeyType = "ENG";
67 pEngine = "chil"; /* for nChiper HSM... */
68 #else
69 pKeyName = "testkey.pem";
70 pKeyType = "PEM";
71 pEngine = NULL;
72 #endif
73
74 headerfile = fopen(pHeaderFile, "wb");
75
76 curl_global_init(CURL_GLOBAL_DEFAULT);
77
78 curl = curl_easy_init();
79 if(curl) {
80 /* what call to write: */
81 curl_easy_setopt(curl, CURLOPT_URL, "HTTPS://your.favourite.ssl.site");
82 curl_easy_setopt(curl, CURLOPT_HEADERDATA, headerfile);
83
84 do { /* dummy loop, just to break out from */
85 if(pEngine) {
86 /* use crypto engine */
87 if(curl_easy_setopt(curl, CURLOPT_SSLENGINE, pEngine) != CURLE_OK) {
88 /* load the crypto engine */
89 fprintf(stderr, "can't set crypto engine\n");
90 break;
91 }
92 if(curl_easy_setopt(curl, CURLOPT_SSLENGINE_DEFAULT, 1L) != CURLE_OK) {
93 /* set the crypto engine as default */
94 /* only needed for the first time you load
95 a engine in a curl object... */
96 fprintf(stderr, "can't set crypto engine as default\n");
97 break;
98 }
99 }
100 /* cert is stored PEM coded in file... */
101 /* since PEM is default, we needn't set it for PEM */
102 curl_easy_setopt(curl, CURLOPT_SSLCERTTYPE, "PEM");
103
104 /* set the cert for client authentication */
105 curl_easy_setopt(curl, CURLOPT_SSLCERT, pCertFile);
106
107 /* sorry, for engine we must set the passphrase
108 (if the key has one...) */
109 if(pPassphrase)
110 curl_easy_setopt(curl, CURLOPT_KEYPASSWD, pPassphrase);
111
112 /* if we use a key stored in a crypto engine,
113 we must set the key type to "ENG" */
114 curl_easy_setopt(curl, CURLOPT_SSLKEYTYPE, pKeyType);
115
116 /* set the private key (file or ID in engine) */
117 curl_easy_setopt(curl, CURLOPT_SSLKEY, pKeyName);
118
119 /* set the file with the certs vaildating the server */
120 curl_easy_setopt(curl, CURLOPT_CAINFO, pCACertFile);
121
122 /* disconnect if we can't validate server's cert */
123 curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 1L);
124
125 /* Perform the request, res will get the return code */
126 res = curl_easy_perform(curl);
127 /* Check for errors */
128 if(res != CURLE_OK)
129 fprintf(stderr, "curl_easy_perform() failed: %s\n",
130 curl_easy_strerror(res));
131
132 /* we are done... */
133 } while(0);
134 /* always cleanup */
135 curl_easy_cleanup(curl);
136 }
137
138 curl_global_cleanup();
139
140 return 0;
141 }
142