1 /***************************************************************************
2  *                                  _   _ ____  _
3  *  Project                     ___| | | |  _ \| |
4  *                             / __| | | | |_) | |
5  *                            | (__| |_| |  _ <| |___
6  *                             \___|\___/|_| \_\_____|
7  *
8  * Copyright (C) 2013, 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 http://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 /* Example using an in memory PEM user certificate and RSA key to retrieve an
23  * https page.
24  * Written by Ishan SinghLevett, based on Theo Borm's cacertinmem.c.
25  * Note that to maintain simplicity this example does not use a CA certificate
26  * for peer verification.  However, some form of peer verification
27  * must be used in real circumstances when a secure connection is required.
28  */
29 
30 #include <openssl/ssl.h>
31 #include <openssl/x509.h>
32 #include <openssl/pem.h>
33 #include <curl/curl.h>
34 #include <stdio.h>
35 
writefunction(void * ptr,size_t size,size_t nmemb,void * stream)36 static size_t writefunction(void *ptr, size_t size, size_t nmemb, void *stream)
37 {
38   fwrite(ptr,size,nmemb,stream);
39   return(nmemb*size);
40 }
41 
sslctx_function(CURL * curl,void * sslctx,void * parm)42 static CURLcode sslctx_function(CURL *curl, void *sslctx, void *parm)
43 {
44   X509 *cert = NULL;
45   BIO *bio = NULL;
46   BIO *kbio = NULL;
47   RSA *rsa = NULL;
48   int ret;
49 
50   const char *mypem = /* www.cacert.org */
51     "-----BEGIN CERTIFICATE-----\n"\
52     "MIIHPTCCBSWgAwIBAgIBADANBgkqhkiG9w0BAQQFADB5MRAwDgYDVQQKEwdSb290\n"\
53     "IENBMR4wHAYDVQQLExVodHRwOi8vd3d3LmNhY2VydC5vcmcxIjAgBgNVBAMTGUNB\n"\
54     "IENlcnQgU2lnbmluZyBBdXRob3JpdHkxITAfBgkqhkiG9w0BCQEWEnN1cHBvcnRA\n"\
55     "Y2FjZXJ0Lm9yZzAeFw0wMzAzMzAxMjI5NDlaFw0zMzAzMjkxMjI5NDlaMHkxEDAO\n"\
56     "BgNVBAoTB1Jvb3QgQ0ExHjAcBgNVBAsTFWh0dHA6Ly93d3cuY2FjZXJ0Lm9yZzEi\n"\
57     "MCAGA1UEAxMZQ0EgQ2VydCBTaWduaW5nIEF1dGhvcml0eTEhMB8GCSqGSIb3DQEJ\n"\
58     "ARYSc3VwcG9ydEBjYWNlcnQub3JnMIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIIC\n"\
59     "CgKCAgEAziLA4kZ97DYoB1CW8qAzQIxL8TtmPzHlawI229Z89vGIj053NgVBlfkJ\n"\
60     "8BLPRoZzYLdufujAWGSuzbCtRRcMY/pnCujW0r8+55jE8Ez64AO7NV1sId6eINm6\n"\
61     "zWYyN3L69wj1x81YyY7nDl7qPv4coRQKFWyGhFtkZip6qUtTefWIonvuLwphK42y\n"\
62     "fk1WpRPs6tqSnqxEQR5YYGUFZvjARL3LlPdCfgv3ZWiYUQXw8wWRBB0bF4LsyFe7\n"\
63     "w2t6iPGwcswlWyCR7BYCEo8y6RcYSNDHBS4CMEK4JZwFaz+qOqfrU0j36NK2B5jc\n"\
64     "G8Y0f3/JHIJ6BVgrCFvzOKKrF11myZjXnhCLotLddJr3cQxyYN/Nb5gznZY0dj4k\n"\
65     "epKwDpUeb+agRThHqtdB7Uq3EvbXG4OKDy7YCbZZ16oE/9KTfWgu3YtLq1i6L43q\n"\
66     "laegw1SJpfvbi1EinbLDvhG+LJGGi5Z4rSDTii8aP8bQUWWHIbEZAWV/RRyH9XzQ\n"\
67     "QUxPKZgh/TMfdQwEUfoZd9vUFBzugcMd9Zi3aQaRIt0AUMyBMawSB3s42mhb5ivU\n"\
68     "fslfrejrckzzAeVLIL+aplfKkQABi6F1ITe1Yw1nPkZPcCBnzsXWWdsC4PDSy826\n"\
69     "YreQQejdIOQpvGQpQsgi3Hia/0PsmBsJUUtaWsJx8cTLc6nloQsCAwEAAaOCAc4w\n"\
70     "ggHKMB0GA1UdDgQWBBQWtTIb1Mfz4OaO873SsDrusjkY0TCBowYDVR0jBIGbMIGY\n"\
71     "gBQWtTIb1Mfz4OaO873SsDrusjkY0aF9pHsweTEQMA4GA1UEChMHUm9vdCBDQTEe\n"\
72     "MBwGA1UECxMVaHR0cDovL3d3dy5jYWNlcnQub3JnMSIwIAYDVQQDExlDQSBDZXJ0\n"\
73     "IFNpZ25pbmcgQXV0aG9yaXR5MSEwHwYJKoZIhvcNAQkBFhJzdXBwb3J0QGNhY2Vy\n"\
74     "dC5vcmeCAQAwDwYDVR0TAQH/BAUwAwEB/zAyBgNVHR8EKzApMCegJaAjhiFodHRw\n"\
75     "czovL3d3dy5jYWNlcnQub3JnL3Jldm9rZS5jcmwwMAYJYIZIAYb4QgEEBCMWIWh0\n"\
76     "dHBzOi8vd3d3LmNhY2VydC5vcmcvcmV2b2tlLmNybDA0BglghkgBhvhCAQgEJxYl\n"\
77     "aHR0cDovL3d3dy5jYWNlcnQub3JnL2luZGV4LnBocD9pZD0xMDBWBglghkgBhvhC\n"\
78     "AQ0ESRZHVG8gZ2V0IHlvdXIgb3duIGNlcnRpZmljYXRlIGZvciBGUkVFIGhlYWQg\n"\
79     "b3ZlciB0byBodHRwOi8vd3d3LmNhY2VydC5vcmcwDQYJKoZIhvcNAQEEBQADggIB\n"\
80     "ACjH7pyCArpcgBLKNQodgW+JapnM8mgPf6fhjViVPr3yBsOQWqy1YPaZQwGjiHCc\n"\
81     "nWKdpIevZ1gNMDY75q1I08t0AoZxPuIrA2jxNGJARjtT6ij0rPtmlVOKTV39O9lg\n"\
82     "18p5aTuxZZKmxoGCXJzN600BiqXfEVWqFcofN8CCmHBh22p8lqOOLlQ+TyGpkO/c\n"\
83     "gr/c6EWtTZBzCDyUZbAEmXZ/4rzCahWqlwQ3JNgelE5tDlG+1sSPypZt90Pf6DBl\n"\
84     "Jzt7u0NDY8RD97LsaMzhGY4i+5jhe1o+ATc7iwiwovOVThrLm82asduycPAtStvY\n"\
85     "sONvRUgzEv/+PDIqVPfE94rwiCPCR/5kenHA0R6mY7AHfqQv0wGP3J8rtsYIqQ+T\n"\
86     "SCX8Ev2fQtzzxD72V7DX3WnRBnc0CkvSyqD/HMaMyRa+xMwyN2hzXwj7UfdJUzYF\n"\
87     "CpUCTPJ5GhD22Dp1nPMd8aINcGeGG7MW9S/lpOt5hvk9C8JzC6WZrG/8Z7jlLwum\n"\
88     "GCSNe9FINSkYQKyTYOGWhlC0elnYjyELn8+CkcY7v2vcB5G5l1YjqrZslMZIBjzk\n"\
89     "zk6q5PYvCdxTby78dOs6Y5nCpqyJvKeyRKANihDjbPIky/qbn3BHLt4Ui9SyIAmW\n"\
90     "omTxJBzcoTWcFbLUvFUufQb1nA5V9FrWk9p2rSVzTMVD\n"\
91     "-----END CERTIFICATE-----\n";
92 
93 /*replace the XXX with the actual RSA key*/
94   const char *mykey =
95     "-----BEGIN RSA PRIVATE KEY-----\n"\
96     "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
97     "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
98     "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\n"\
99     "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX\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     "-----END RSA PRIVATE KEY-----\n";
113 
114   (void)curl; /* avoid warnings */
115   (void)parm; /* avoid warnings */
116 
117   /* get a BIO */
118   bio = BIO_new_mem_buf((char *)mypem, -1);
119 
120   if (bio == NULL) {
121     printf("BIO_new_mem_buf failed\n");
122   }
123 
124   /* use it to read the PEM formatted certificate from memory into an X509
125    * structure that SSL can use
126    */
127   cert = PEM_read_bio_X509(bio, NULL, 0, NULL);
128   if (cert == NULL) {
129     printf("PEM_read_bio_X509 failed...\n");
130   }
131 
132   /*tell SSL to use the X509 certificate*/
133   ret = SSL_CTX_use_certificate((SSL_CTX*)sslctx, cert);
134   if (ret != 1) {
135     printf("Use certificate failed\n");
136   }
137 
138   /*create a bio for the RSA key*/
139   kbio = BIO_new_mem_buf((char *)mykey, -1);
140   if (kbio == NULL) {
141     printf("BIO_new_mem_buf failed\n");
142   }
143 
144   /*read the key bio into an RSA object*/
145   rsa = PEM_read_bio_RSAPrivateKey(kbio, NULL, 0, NULL);
146   if (rsa == NULL) {
147     printf("Failed to create key bio\n");
148   }
149 
150   /*tell SSL to use the RSA key from memory*/
151   ret = SSL_CTX_use_RSAPrivateKey((SSL_CTX*)sslctx, rsa);
152   if (ret != 1) {
153     printf("Use Key failed\n");
154   }
155 
156   /* free resources that have been allocated by openssl functions */
157   if (bio)
158     BIO_free(bio);
159 
160   if (kbio)
161     BIO_free(kbio);
162 
163   if (rsa)
164     RSA_free(rsa);
165 
166   if (cert)
167     X509_free(cert);
168 
169   /* all set to go */
170   return CURLE_OK ;
171 }
172 
main(void)173 int main(void)
174 {
175   CURL *ch;
176   CURLcode rv;
177 
178   rv = curl_global_init(CURL_GLOBAL_ALL);
179   ch = curl_easy_init();
180   rv = curl_easy_setopt(ch,CURLOPT_VERBOSE, 0L);
181   rv = curl_easy_setopt(ch,CURLOPT_HEADER, 0L);
182   rv = curl_easy_setopt(ch,CURLOPT_NOPROGRESS, 1L);
183   rv = curl_easy_setopt(ch,CURLOPT_NOSIGNAL, 1L);
184   rv = curl_easy_setopt(ch,CURLOPT_WRITEFUNCTION, *writefunction);
185   rv = curl_easy_setopt(ch,CURLOPT_WRITEDATA, stdout);
186   rv = curl_easy_setopt(ch,CURLOPT_HEADERFUNCTION, *writefunction);
187   rv = curl_easy_setopt(ch,CURLOPT_HEADERDATA, stderr);
188   rv = curl_easy_setopt(ch,CURLOPT_SSLCERTTYPE,"PEM");
189 
190   /* both VERIFYPEER and VERIFYHOST are set to 0 in this case because there is
191      no CA certificate*/
192 
193   rv = curl_easy_setopt(ch,CURLOPT_SSL_VERIFYPEER, 0L);
194   rv = curl_easy_setopt(ch,CURLOPT_SSL_VERIFYHOST, 0L);
195   rv = curl_easy_setopt(ch, CURLOPT_URL, "https://www.example.com/");
196   rv = curl_easy_setopt(ch, CURLOPT_SSLKEYTYPE, "PEM");
197 
198   /* first try: retrieve page without user certificate and key -> will fail
199    */
200   rv = curl_easy_perform(ch);
201   if (rv==CURLE_OK) {
202     printf("*** transfer succeeded ***\n");
203   }
204   else {
205     printf("*** transfer failed ***\n");
206   }
207 
208   /* second try: retrieve page using user certificate and key -> will succeed
209    * load the certificate and key by installing a function doing the necessary
210    * "modifications" to the SSL CONTEXT just before link init
211    */
212   rv = curl_easy_setopt(ch,CURLOPT_SSL_CTX_FUNCTION, *sslctx_function);
213   rv = curl_easy_perform(ch);
214   if (rv==CURLE_OK) {
215     printf("*** transfer succeeded ***\n");
216   }
217   else {
218     printf("*** transfer failed ***\n");
219   }
220 
221   curl_easy_cleanup(ch);
222   curl_global_cleanup();
223   return rv;
224 }
225