summaryrefslogtreecommitdiff
path: root/docs/examples/usercertinmem.c
blob: c61a230c4ce674e0e2e9229d53b132fa499ddf33 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
/***************************************************************************
 *                                  _   _ ____  _
 *  Project                     ___| | | |  _ \| |
 *                             / __| | | | |_) | |
 *                            | (__| |_| |  _ <| |___
 *                             \___|\___/|_| \_\_____|
 *
 * Copyright (C) 2013 - 2019, 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.
 *
 ***************************************************************************/
/* <DESC>
 * Use an in-memory user certificate and RSA 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.  However, some form of peer verification
 * must be used in real circumstances when a secure connection is required.
 */

#include <openssl/ssl.h>
#include <openssl/x509.h>
#include <openssl/pem.h>
#include <curl/curl.h>
#include <stdio.h>

static size_t writefunction(void *ptr, size_t size, size_t nmemb, void *stream)
{
  fwrite(ptr, size, nmemb, stream);
  return (nmemb*size);
}

static CURLcode sslctx_function(CURL *curl, void *sslctx, void *parm)
{
  X509 *cert = NULL;
  BIO *bio = NULL;
  BIO *kbio = NULL;
  RSA *rsa = NULL;
  int ret;

  const char *mypem = /* www.cacert.org */
    "-----BEGIN CERTIFICATE-----\n"\
    "MIIHPTCCBSWgAwIBAgIBADANBgkqhkiG9w0BAQQFADB5MRAwDgYDVQQKEwdSb290\n"\
    "IENBMR4wHAYDVQQLExVodHRwOi8vd3d3LmNhY2VydC5vcmcxIjAgBgNVBAMTGUNB\n"\
    "IENlcnQgU2lnbmluZyBBdXRob3JpdHkxITAfBgkqhkiG9w0BCQEWEnN1cHBvcnRA\n"\
    "Y2FjZXJ0Lm9yZzAeFw0wMzAzMzAxMjI5NDlaFw0zMzAzMjkxMjI5NDlaMHkxEDAO\n"\
    "BgNVBAoTB1Jvb3QgQ0ExHjAcBgNVBAsTFWh0dHA6Ly93d3cuY2FjZXJ0Lm9yZzEi\n"\
    "MCAGA1UEAxMZQ0EgQ2VydCBTaWduaW5nIEF1dGhvcml0eTEhMB8GCSqGSIb3DQEJ\n"\
    "ARYSc3VwcG9ydEBjYWNlcnQub3JnMIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIIC\n"\
    "CgKCAgEAziLA4kZ97DYoB1CW8qAzQIxL8TtmPzHlawI229Z89vGIj053NgVBlfkJ\n"\
    "8BLPRoZzYLdufujAWGSuzbCtRRcMY/pnCujW0r8+55jE8Ez64AO7NV1sId6eINm6\n"\
    "zWYyN3L69wj1x81YyY7nDl7qPv4coRQKFWyGhFtkZip6qUtTefWIonvuLwphK42y\n"\
    "fk1WpRPs6tqSnqxEQR5YYGUFZvjARL3LlPdCfgv3ZWiYUQXw8wWRBB0bF4LsyFe7\n"\
    "w2t6iPGwcswlWyCR7BYCEo8y6RcYSNDHBS4CMEK4JZwFaz+qOqfrU0j36NK2B5jc\n"\
    "G8Y0f3/JHIJ6BVgrCFvzOKKrF11myZjXnhCLotLddJr3cQxyYN/Nb5gznZY0dj4k\n"\
    "epKwDpUeb+agRThHqtdB7Uq3EvbXG4OKDy7YCbZZ16oE/9KTfWgu3YtLq1i6L43q\n"\
    "laegw1SJpfvbi1EinbLDvhG+LJGGi5Z4rSDTii8aP8bQUWWHIbEZAWV/RRyH9XzQ\n"\
    "QUxPKZgh/TMfdQwEUfoZd9vUFBzugcMd9Zi3aQaRIt0AUMyBMawSB3s42mhb5ivU\n"\
    "fslfrejrckzzAeVLIL+aplfKkQABi6F1ITe1Yw1nPkZPcCBnzsXWWdsC4PDSy826\n"\
    "YreQQejdIOQpvGQpQsgi3Hia/0PsmBsJUUtaWsJx8cTLc6nloQsCAwEAAaOCAc4w\n"\
    "ggHKMB0GA1UdDgQWBBQWtTIb1Mfz4OaO873SsDrusjkY0TCBowYDVR0jBIGbMIGY\n"\
    "gBQWtTIb1Mfz4OaO873SsDrusjkY0aF9pHsweTEQMA4GA1UEChMHUm9vdCBDQTEe\n"\
    "MBwGA1UECxMVaHR0cDovL3d3dy5jYWNlcnQub3JnMSIwIAYDVQQDExlDQSBDZXJ0\n"\
    "IFNpZ25pbmcgQXV0aG9yaXR5MSEwHwYJKoZIhvcNAQkBFhJzdXBwb3J0QGNhY2Vy\n"\
    "dC5vcmeCAQAwDwYDVR0TAQH/BAUwAwEB/zAyBgNVHR8EKzApMCegJaAjhiFodHRw\n"\
    "czovL3d3dy5jYWNlcnQub3JnL3Jldm9rZS5jcmwwMAYJYIZIAYb4QgEEBCMWIWh0\n"\
    "dHBzOi8vd3d3LmNhY2VydC5vcmcvcmV2b2tlLmNybDA0BglghkgBhvhCAQgEJxYl\n"\
    "aHR0cDovL3d3dy5jYWNlcnQub3JnL2luZGV4LnBocD9pZD0xMDBWBglghkgBhvhC\n"\
    "AQ0ESRZHVG8gZ2V0IHlvdXIgb3duIGNlcnRpZmljYXRlIGZvciBGUkVFIGhlYWQg\n"\
    "b3ZlciB0byBodHRwOi8vd3d3LmNhY2VydC5vcmcwDQYJKoZIhvcNAQEEBQADggIB\n"\
    "ACjH7pyCArpcgBLKNQodgW+JapnM8mgPf6fhjViVPr3yBsOQWqy1YPaZQwGjiHCc\n"\
    "nWKdpIevZ1gNMDY75q1I08t0AoZxPuIrA2jxNGJARjtT6ij0rPtmlVOKTV39O9lg\n"\
    "18p5aTuxZZKmxoGCXJzN600BiqXfEVWqFcofN8CCmHBh22p8lqOOLlQ+TyGpkO/c\n"\
    "gr/c6EWtTZBzCDyUZbAEmXZ/4rzCahWqlwQ3JNgelE5tDlG+1sSPypZt90Pf6DBl\n"\
    "Jzt7u0NDY8RD97LsaMzhGY4i+5jhe1o+ATc7iwiwovOVThrLm82asduycPAtStvY\n"\
    "sONvRUgzEv/+PDIqVPfE94rwiCPCR/5kenHA0R6mY7AHfqQv0wGP3J8rtsYIqQ+T\n"\
    "SCX8Ev2fQtzzxD72V7DX3WnRBnc0CkvSyqD/HMaMyRa+xMwyN2hzXwj7UfdJUzYF\n"\
    "CpUCTPJ5GhD22Dp1nPMd8aINcGeGG7MW9S/lpOt5hvk9C8JzC6WZrG/8Z7jlLwum\n"\
    "GCSNe9FINSkYQKyTYOGWhlC0elnYjyELn8+CkcY7v2vcB5G5l1YjqrZslMZIBjzk\n"\
    "zk6q5PYvCdxTby78dOs6Y5nCpqyJvKeyRKANihDjbPIky/qbn3BHLt4Ui9SyIAmW\n"\
    "omTxJBzcoTWcFbLUvFUufQb1nA5V9FrWk9p2rSVzTMVD\n"\
    "-----END CERTIFICATE-----\n";

/*replace the XXX with the actual RSA key*/
  const char *mykey =
    "-----BEGIN RSA PRIVATE KEY-----\n"\
    "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
    "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
    "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
    "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
    "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
    "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
    "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
    "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
    "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
    "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
    "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
    "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
    "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
    "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
    "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
    "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
    "-----END RSA PRIVATE KEY-----\n";

  (void)curl; /* avoid warnings */
  (void)parm; /* avoid warnings */

  /* get a BIO */
  bio = BIO_new_mem_buf((char *)mypem, -1);

  if(bio == NULL) {
    printf("BIO_new_mem_buf failed\n");
  }

  /* 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 == NULL) {
    printf("PEM_read_bio_X509 failed...\n");
  }

  /*tell SSL to use the X509 certificate*/
  ret = SSL_CTX_use_certificate((SSL_CTX*)sslctx, cert);
  if(ret != 1) {
    printf("Use certificate failed\n");
  }

  /*create a bio for the RSA key*/
  kbio = BIO_new_mem_buf((char *)mykey, -1);
  if(kbio == NULL) {
    printf("BIO_new_mem_buf failed\n");
  }

  /*read the key bio into an RSA object*/
  rsa = PEM_read_bio_RSAPrivateKey(kbio, NULL, 0, NULL);
  if(rsa == NULL) {
    printf("Failed to create key bio\n");
  }

  /*tell SSL to use the RSA key from memory*/
  ret = SSL_CTX_use_RSAPrivateKey((SSL_CTX*)sslctx, rsa);
  if(ret != 1) {
    printf("Use Key failed\n");
  }

  /* free resources that have been allocated by openssl functions */
  if(bio)
    BIO_free(bio);

  if(kbio)
    BIO_free(kbio);

  if(rsa)
    RSA_free(rsa);

  if(cert)
    X509_free(cert);

  /* all set to go */
  return CURLE_OK;
}

int main(void)
{
  CURL *ch;
  CURLcode rv;

  curl_global_init(CURL_GLOBAL_ALL);
  ch = curl_easy_init();
  curl_easy_setopt(ch, CURLOPT_VERBOSE, 0L);
  curl_easy_setopt(ch, CURLOPT_HEADER, 0L);
  curl_easy_setopt(ch, CURLOPT_NOPROGRESS, 1L);
  curl_easy_setopt(ch, CURLOPT_NOSIGNAL, 1L);
  curl_easy_setopt(ch, CURLOPT_WRITEFUNCTION, writefunction);
  curl_easy_setopt(ch, CURLOPT_WRITEDATA, stdout);
  curl_easy_setopt(ch, CURLOPT_HEADERFUNCTION, writefunction);
  curl_easy_setopt(ch, CURLOPT_HEADERDATA, stderr);
  curl_easy_setopt(ch, CURLOPT_SSLCERTTYPE, "PEM");

  /* both VERIFYPEER and VERIFYHOST are set to 0 in this case because there is
     no CA certificate*/

  curl_easy_setopt(ch, CURLOPT_SSL_VERIFYPEER, 0L);
  curl_easy_setopt(ch, CURLOPT_SSL_VERIFYHOST, 0L);
  curl_easy_setopt(ch, CURLOPT_URL, "https://www.example.com/");
  curl_easy_setopt(ch, CURLOPT_SSLKEYTYPE, "PEM");

  /* first try: retrieve page without user certificate and key -> will fail
   */
  rv = curl_easy_perform(ch);
  if(rv == CURLE_OK) {
    printf("*** transfer succeeded ***\n");
  }
  else {
    printf("*** transfer failed ***\n");
  }

  /* second try: retrieve page using user certificate and key -> will succeed
   * load the certificate and key by installing a function doing the necessary
   * "modifications" to the SSL CONTEXT just before link init
   */
  curl_easy_setopt(ch, CURLOPT_SSL_CTX_FUNCTION, *sslctx_function);
  rv = curl_easy_perform(ch);
  if(rv == CURLE_OK) {
    printf("*** transfer succeeded ***\n");
  }
  else {
    printf("*** transfer failed ***\n");
  }

  curl_easy_cleanup(ch);
  curl_global_cleanup();
  return rv;
}