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
|
#include <stdio.h>
#include <netdb.h>
#include <stdlib.h>
#include <unistd.h>
#include <err.h>
#include <sys/socket.h>
#include <openssl/ssl.h>
#include <openssl/ocsp.h>
static int
tcp_connect(char *host, char *port)
{
int error, sd = -1;
struct addrinfo hints, *res, *r;
memset(&hints, 0, sizeof(struct addrinfo));
hints.ai_family = AF_INET;
hints.ai_socktype = SOCK_STREAM;
error = getaddrinfo(host, port, &hints, &res);
if (error != 0) {
perror("getaddrinfo()");
exit(-1);
}
for (r = res; r != NULL; r = r->ai_next) {
sd = socket(r->ai_family, r->ai_socktype, r->ai_protocol);
if (sd == -1)
continue;
if (connect(sd, r->ai_addr, r->ai_addrlen) == 0)
break;
close(sd);
}
freeaddrinfo(res);
return sd;
}
int
main(int argc, char *argv[])
{
int sd, ocsp_status;
const unsigned char *p;
long len;
OCSP_RESPONSE *rsp = NULL;
OCSP_BASICRESP *br = NULL;
X509_STORE *st = NULL;
STACK_OF(X509) *ch = NULL;
char *host, *port;
#ifdef _PATH_SSL_CA_FILE
char *cafile = _PATH_SSL_CA_FILE;
#else
char *cafile = "/etc/ssl/cert.pem";
#endif
SSL *ssl;
SSL_CTX *ctx;
SSL_library_init();
SSL_load_error_strings();
ctx = SSL_CTX_new(SSLv23_client_method());
if (!SSL_CTX_load_verify_locations(ctx, cafile, NULL)) {
printf("failed to load %s\n", cafile);
exit(-1);
}
if (argc != 3)
errx(-1, "need a host and port to connect to");
else {
host = argv[1];
port = argv[2];
}
sd = tcp_connect(host, port);
ssl = SSL_new(ctx);
SSL_set_fd(ssl, (int) sd);
SSL_set_tlsext_status_type(ssl, TLSEXT_STATUSTYPE_ocsp);
if (SSL_connect(ssl) <= 0) {
printf("SSL connect error\n");
exit(-1);
}
if (SSL_get_verify_result(ssl) != X509_V_OK) {
printf("Certificate doesn't verify from host %s port %s\n", host, port);
exit(-1);
}
/* ==== VERIFY OCSP RESPONSE ==== */
len = SSL_get_tlsext_status_ocsp_resp(ssl, &p);
if (!p) {
printf("No OCSP response received for %s port %s\n", host, port);
exit(-1);
}
rsp = d2i_OCSP_RESPONSE(NULL, &p, len);
if (!rsp) {
puts("Invalid OCSP response");
exit(-1);
}
ocsp_status = OCSP_response_status(rsp);
if (ocsp_status != OCSP_RESPONSE_STATUS_SUCCESSFUL) {
printf("Invalid OCSP response status: %s (%d)",
OCSP_response_status_str(ocsp_status), ocsp_status);
exit(-1);
}
br = OCSP_response_get1_basic(rsp);
if (!br) {
puts("Invalid OCSP response");
exit(-1);
}
ch = SSL_get_peer_cert_chain(ssl);
st = SSL_CTX_get_cert_store(ctx);
if (OCSP_basic_verify(br, ch, st, 0) <= 0) {
puts("OCSP response verification failed");
exit(-1);
}
printf("OCSP validated from %s %s\n", host, port);
return 0;
}
|
