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
|
/* This example code is placed in the public domain. */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <gnutls/gnutls.h>
#include <gnutls/x509.h>
#include <gnutls/pkcs11.h>
#include <assert.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <getpass.h> /* for getpass() */
/* A TLS client that loads the certificate and key.
*/
#define CHECK(x) assert((x)>=0)
#define MAX_BUF 1024
#define MSG "GET / HTTP/1.0\r\n\r\n"
#define MIN(x,y) (((x)<(y))?(x):(y))
#define CAFILE "/etc/ssl/certs/ca-certificates.crt"
/* The URLs of the objects can be obtained
* using p11tool --list-all --login
*/
#define KEY_URL "pkcs11:manufacturer=SomeManufacturer;object=Private%20Key" \
";objecttype=private;id=%db%5b%3e%b5%72%33"
#define CERT_URL "pkcs11:manufacturer=SomeManufacturer;object=Certificate;" \
"objecttype=cert;id=db%5b%3e%b5%72%33"
extern int tcp_connect(void);
extern void tcp_close(int sd);
static int
pin_callback(void *user, int attempt, const char *token_url,
const char *token_label, unsigned int flags, char *pin,
size_t pin_max)
{
const char *password;
int len;
printf("PIN required for token '%s' with URL '%s'\n", token_label,
token_url);
if (flags & GNUTLS_PIN_FINAL_TRY)
printf("*** This is the final try before locking!\n");
if (flags & GNUTLS_PIN_COUNT_LOW)
printf("*** Only few tries left before locking!\n");
if (flags & GNUTLS_PIN_WRONG)
printf("*** Wrong PIN\n");
password = getpass("Enter pin: ");
/* FIXME: ensure that we are in UTF-8 locale */
if (password == NULL || password[0] == 0) {
fprintf(stderr, "No password given\n");
exit(1);
}
len = MIN(pin_max - 1, strlen(password));
memcpy(pin, password, len);
pin[len] = 0;
return 0;
}
int main(void)
{
int ret, sd, ii;
gnutls_session_t session;
char buffer[MAX_BUF + 1];
gnutls_certificate_credentials_t xcred;
/* Allow connections to servers that have OpenPGP keys as well.
*/
if (gnutls_check_version("3.1.4") == NULL) {
fprintf(stderr, "GnuTLS 3.1.4 or later is required for this example\n");
exit(1);
}
/* for backwards compatibility with gnutls < 3.3.0 */
CHECK(gnutls_global_init());
/* The PKCS11 private key operations may require PIN.
* Register a callback. */
gnutls_pkcs11_set_pin_function(pin_callback, NULL);
/* X509 stuff */
CHECK(gnutls_certificate_allocate_credentials(&xcred));
/* sets the trusted cas file
*/
CHECK(gnutls_certificate_set_x509_trust_file(xcred, CAFILE,
GNUTLS_X509_FMT_PEM));
CHECK(gnutls_certificate_set_x509_key_file(xcred, CERT_URL, KEY_URL,
GNUTLS_X509_FMT_DER));
/* Note that there is no server certificate verification in this example
*/
/* Initialize TLS session
*/
CHECK(gnutls_init(&session, GNUTLS_CLIENT));
/* Use default priorities */
CHECK(gnutls_set_default_priority(session));
/* put the x509 credentials to the current session
*/
CHECK(gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, xcred));
/* connect to the peer
*/
sd = tcp_connect();
gnutls_transport_set_int(session, sd);
/* Perform the TLS handshake
*/
ret = gnutls_handshake(session);
if (ret < 0) {
fprintf(stderr, "*** Handshake failed\n");
gnutls_perror(ret);
goto end;
} else {
char *desc;
desc = gnutls_session_get_desc(session);
printf("- Session info: %s\n", desc);
gnutls_free(desc);
}
CHECK(gnutls_record_send(session, MSG, strlen(MSG)));
ret = gnutls_record_recv(session, buffer, MAX_BUF);
if (ret == 0) {
printf("- Peer has closed the TLS connection\n");
goto end;
} else if (ret < 0) {
fprintf(stderr, "*** Error: %s\n", gnutls_strerror(ret));
goto end;
}
printf("- Received %d bytes: ", ret);
for (ii = 0; ii < ret; ii++) {
fputc(buffer[ii], stdout);
}
fputs("\n", stdout);
CHECK(gnutls_bye(session, GNUTLS_SHUT_RDWR));
end:
tcp_close(sd);
gnutls_deinit(session);
gnutls_certificate_free_credentials(xcred);
gnutls_global_deinit();
return 0;
}
|
