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 * Use an in-memory user certificate and RSA key and retrieve an https page.
26 * </DESC>
27 */
28/* Written by Ishan SinghLevett, based on Theo Borm's cacertinmem.c.
29 * Note that to maintain simplicity this example does not use a CA certificate
30 * for peer verification.  However, some form of peer verification
31 * must be used in real circumstances when a secure connection is required.
32 */
33
34#include <openssl/ssl.h>
35#include <openssl/x509.h>
36#include <openssl/pem.h>
37#include <curl/curl.h>
38#include <stdio.h>
39
40static size_t writefunction(void *ptr, size_t size, size_t nmemb, void *stream)
41{
42  fwrite(ptr, size, nmemb, stream);
43  return (nmemb*size);
44}
45
46static CURLcode sslctx_function(CURL *curl, void *sslctx, void *parm)
47{
48  X509 *cert = NULL;
49  BIO *bio = NULL;
50  BIO *kbio = NULL;
51  RSA *rsa = NULL;
52  int ret;
53
54  const char *mypem = /* www.cacert.org */
55    "-----BEGIN CERTIFICATE-----\n"\
56    "MIIHPTCCBSWgAwIBAgIBADANBgkqhkiG9w0BAQQFADB5MRAwDgYDVQQKEwdSb290\n"\
57    "IENBMR4wHAYDVQQLExVodHRwOi8vd3d3LmNhY2VydC5vcmcxIjAgBgNVBAMTGUNB\n"\
58    "IENlcnQgU2lnbmluZyBBdXRob3JpdHkxITAfBgkqhkiG9w0BCQEWEnN1cHBvcnRA\n"\
59    "Y2FjZXJ0Lm9yZzAeFw0wMzAzMzAxMjI5NDlaFw0zMzAzMjkxMjI5NDlaMHkxEDAO\n"\
60    "BgNVBAoTB1Jvb3QgQ0ExHjAcBgNVBAsTFWh0dHA6Ly93d3cuY2FjZXJ0Lm9yZzEi\n"\
61    "MCAGA1UEAxMZQ0EgQ2VydCBTaWduaW5nIEF1dGhvcml0eTEhMB8GCSqGSIb3DQEJ\n"\
62    "ARYSc3VwcG9ydEBjYWNlcnQub3JnMIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIIC\n"\
63    "CgKCAgEAziLA4kZ97DYoB1CW8qAzQIxL8TtmPzHlawI229Z89vGIj053NgVBlfkJ\n"\
64    "8BLPRoZzYLdufujAWGSuzbCtRRcMY/pnCujW0r8+55jE8Ez64AO7NV1sId6eINm6\n"\
65    "zWYyN3L69wj1x81YyY7nDl7qPv4coRQKFWyGhFtkZip6qUtTefWIonvuLwphK42y\n"\
66    "fk1WpRPs6tqSnqxEQR5YYGUFZvjARL3LlPdCfgv3ZWiYUQXw8wWRBB0bF4LsyFe7\n"\
67    "w2t6iPGwcswlWyCR7BYCEo8y6RcYSNDHBS4CMEK4JZwFaz+qOqfrU0j36NK2B5jc\n"\
68    "G8Y0f3/JHIJ6BVgrCFvzOKKrF11myZjXnhCLotLddJr3cQxyYN/Nb5gznZY0dj4k\n"\
69    "epKwDpUeb+agRThHqtdB7Uq3EvbXG4OKDy7YCbZZ16oE/9KTfWgu3YtLq1i6L43q\n"\
70    "laegw1SJpfvbi1EinbLDvhG+LJGGi5Z4rSDTii8aP8bQUWWHIbEZAWV/RRyH9XzQ\n"\
71    "QUxPKZgh/TMfdQwEUfoZd9vUFBzugcMd9Zi3aQaRIt0AUMyBMawSB3s42mhb5ivU\n"\
72    "fslfrejrckzzAeVLIL+aplfKkQABi6F1ITe1Yw1nPkZPcCBnzsXWWdsC4PDSy826\n"\
73    "YreQQejdIOQpvGQpQsgi3Hia/0PsmBsJUUtaWsJx8cTLc6nloQsCAwEAAaOCAc4w\n"\
74    "ggHKMB0GA1UdDgQWBBQWtTIb1Mfz4OaO873SsDrusjkY0TCBowYDVR0jBIGbMIGY\n"\
75    "gBQWtTIb1Mfz4OaO873SsDrusjkY0aF9pHsweTEQMA4GA1UEChMHUm9vdCBDQTEe\n"\
76    "MBwGA1UECxMVaHR0cDovL3d3dy5jYWNlcnQub3JnMSIwIAYDVQQDExlDQSBDZXJ0\n"\
77    "IFNpZ25pbmcgQXV0aG9yaXR5MSEwHwYJKoZIhvcNAQkBFhJzdXBwb3J0QGNhY2Vy\n"\
78    "dC5vcmeCAQAwDwYDVR0TAQH/BAUwAwEB/zAyBgNVHR8EKzApMCegJaAjhiFodHRw\n"\
79    "czovL3d3dy5jYWNlcnQub3JnL3Jldm9rZS5jcmwwMAYJYIZIAYb4QgEEBCMWIWh0\n"\
80    "dHBzOi8vd3d3LmNhY2VydC5vcmcvcmV2b2tlLmNybDA0BglghkgBhvhCAQgEJxYl\n"\
81    "aHR0cDovL3d3dy5jYWNlcnQub3JnL2luZGV4LnBocD9pZD0xMDBWBglghkgBhvhC\n"\
82    "AQ0ESRZHVG8gZ2V0IHlvdXIgb3duIGNlcnRpZmljYXRlIGZvciBGUkVFIGhlYWQg\n"\
83    "b3ZlciB0byBodHRwOi8vd3d3LmNhY2VydC5vcmcwDQYJKoZIhvcNAQEEBQADggIB\n"\
84    "ACjH7pyCArpcgBLKNQodgW+JapnM8mgPf6fhjViVPr3yBsOQWqy1YPaZQwGjiHCc\n"\
85    "nWKdpIevZ1gNMDY75q1I08t0AoZxPuIrA2jxNGJARjtT6ij0rPtmlVOKTV39O9lg\n"\
86    "18p5aTuxZZKmxoGCXJzN600BiqXfEVWqFcofN8CCmHBh22p8lqOOLlQ+TyGpkO/c\n"\
87    "gr/c6EWtTZBzCDyUZbAEmXZ/4rzCahWqlwQ3JNgelE5tDlG+1sSPypZt90Pf6DBl\n"\
88    "Jzt7u0NDY8RD97LsaMzhGY4i+5jhe1o+ATc7iwiwovOVThrLm82asduycPAtStvY\n"\
89    "sONvRUgzEv/+PDIqVPfE94rwiCPCR/5kenHA0R6mY7AHfqQv0wGP3J8rtsYIqQ+T\n"\
90    "SCX8Ev2fQtzzxD72V7DX3WnRBnc0CkvSyqD/HMaMyRa+xMwyN2hzXwj7UfdJUzYF\n"\
91    "CpUCTPJ5GhD22Dp1nPMd8aINcGeGG7MW9S/lpOt5hvk9C8JzC6WZrG/8Z7jlLwum\n"\
92    "GCSNe9FINSkYQKyTYOGWhlC0elnYjyELn8+CkcY7v2vcB5G5l1YjqrZslMZIBjzk\n"\
93    "zk6q5PYvCdxTby78dOs6Y5nCpqyJvKeyRKANihDjbPIky/qbn3BHLt4Ui9SyIAmW\n"\
94    "omTxJBzcoTWcFbLUvFUufQb1nA5V9FrWk9p2rSVzTMVD\n"\
95    "-----END CERTIFICATE-----\n";
96
97/* replace the XXX with the actual RSA key */
98  const char *mykey =
99    "-----BEGIN RSA PRIVATE KEY-----\n"\
100    "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
101    "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
102    "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
103    "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
104    "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
105    "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
106    "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
107    "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
108    "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
109    "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
110    "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
111    "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
112    "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
113    "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
114    "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
115    "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
116    "-----END RSA PRIVATE KEY-----\n";
117
118  (void)curl; /* avoid warnings */
119  (void)parm; /* avoid warnings */
120
121  /* get a BIO */
122  bio = BIO_new_mem_buf((char *)mypem, -1);
123
124  if(!bio) {
125    printf("BIO_new_mem_buf failed\n");
126  }
127
128  /* use it to read the PEM formatted certificate from memory into an X509
129   * structure that SSL can use
130   */
131  cert = PEM_read_bio_X509(bio, NULL, 0, NULL);
132  if(!cert) {
133    printf("PEM_read_bio_X509 failed...\n");
134  }
135
136  /* tell SSL to use the X509 certificate */
137  ret = SSL_CTX_use_certificate((SSL_CTX*)sslctx, cert);
138  if(ret != 1) {
139    printf("Use certificate failed\n");
140  }
141
142  /* create a bio for the RSA key */
143  kbio = BIO_new_mem_buf((char *)mykey, -1);
144  if(!kbio) {
145    printf("BIO_new_mem_buf failed\n");
146  }
147
148  /* read the key bio into an RSA object */
149  rsa = PEM_read_bio_RSAPrivateKey(kbio, NULL, 0, NULL);
150  if(!rsa) {
151    printf("Failed to create key bio\n");
152  }
153
154  /* tell SSL to use the RSA key from memory */
155  ret = SSL_CTX_use_RSAPrivateKey((SSL_CTX*)sslctx, rsa);
156  if(ret != 1) {
157    printf("Use Key failed\n");
158  }
159
160  /* free resources that have been allocated by openssl functions */
161  if(bio)
162    BIO_free(bio);
163
164  if(kbio)
165    BIO_free(kbio);
166
167  if(rsa)
168    RSA_free(rsa);
169
170  if(cert)
171    X509_free(cert);
172
173  /* all set to go */
174  return CURLE_OK;
175}
176
177int main(void)
178{
179  CURL *ch;
180  CURLcode rv;
181
182  curl_global_init(CURL_GLOBAL_ALL);
183  ch = curl_easy_init();
184  curl_easy_setopt(ch, CURLOPT_VERBOSE, 0L);
185  curl_easy_setopt(ch, CURLOPT_HEADER, 0L);
186  curl_easy_setopt(ch, CURLOPT_NOPROGRESS, 1L);
187  curl_easy_setopt(ch, CURLOPT_NOSIGNAL, 1L);
188  curl_easy_setopt(ch, CURLOPT_WRITEFUNCTION, writefunction);
189  curl_easy_setopt(ch, CURLOPT_WRITEDATA, stdout);
190  curl_easy_setopt(ch, CURLOPT_HEADERFUNCTION, writefunction);
191  curl_easy_setopt(ch, CURLOPT_HEADERDATA, stderr);
192  curl_easy_setopt(ch, CURLOPT_SSLCERTTYPE, "PEM");
193
194  /* both VERIFYPEER and VERIFYHOST are set to 0 in this case because there is
195     no CA certificate */
196
197  curl_easy_setopt(ch, CURLOPT_SSL_VERIFYPEER, 0L);
198  curl_easy_setopt(ch, CURLOPT_SSL_VERIFYHOST, 0L);
199  curl_easy_setopt(ch, CURLOPT_URL, "https://www.example.com/");
200  curl_easy_setopt(ch, CURLOPT_SSLKEYTYPE, "PEM");
201
202  /* first try: retrieve page without user certificate and key -> will fail
203   */
204  rv = curl_easy_perform(ch);
205  if(rv == CURLE_OK) {
206    printf("*** transfer succeeded ***\n");
207  }
208  else {
209    printf("*** transfer failed ***\n");
210  }
211
212  /* second try: retrieve page using user certificate and key -> will succeed
213   * load the certificate and key by installing a function doing the necessary
214   * "modifications" to the SSL CONTEXT just before link init
215   */
216  curl_easy_setopt(ch, CURLOPT_SSL_CTX_FUNCTION, sslctx_function);
217  rv = curl_easy_perform(ch);
218  if(rv == CURLE_OK) {
219    printf("*** transfer succeeded ***\n");
220  }
221  else {
222    printf("*** transfer failed ***\n");
223  }
224
225  curl_easy_cleanup(ch);
226  curl_global_cleanup();
227  return rv;
228}
229