openssl双向验证

接上文生成证书之后，双向验证c/s ssl通信

源代码来源openssl

服务端源代码：serv.cpp

/* serv.cpp  -  Minimal ssleay server for Unix
30.9.1996, Sampo Kellomaki <sampo@iki.fi> */

/* mangled to work with SSLeay-0.9.0b and OpenSSL 0.9.2b
Simplified to be even more minimal
12/98 - 4/99 Wade Scholine <wades@mail.cybg.com> */

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <memory.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>

#include <openssl/rsa.h>       /* SSLeay stuff */
#include <openssl/crypto.h>
#include <openssl/x509.h>
#include <openssl/pem.h>
#include <openssl/ssl.h>
#include <openssl/err.h>

/* define HOME to be dir for key and cert files... */
#define HOME "./"
/* Make these what you want for cert & key files */
#define CA HOME "ca.crt"
#define CERTF  HOME "server.crt"
#define KEYF  HOME  "server.key"

#define CHK_NULL(x) if ((x)==NULL) exit (1)
#define CHK_ERR(err,s) if ((err)==-1) { perror(s); exit(1); }
#define CHK_SSL(err) if ((err)==-1) { ERR_print_errors_fp(stderr); exit(2); }

int main ()
{
int err;
int listen_sd;
int sd;
struct sockaddr_in sa_serv;
struct sockaddr_in sa_cli;
socklen_t  client_len;
SSL_CTX* ctx;
SSL*     ssl;
X509*    client_cert;
char*    str;
char     buf [4096];
//SSL_METHOD *meth;

/* SSL preliminaries. We keep the certificate and key with the context. */

SSL_load_error_strings();
SSLeay_add_ssl_algorithms();
//meth = SSLv23_server_method();
ctx = SSL_CTX_new (SSLv23_server_method());
if (!ctx) {
ERR_print_errors_fp(stderr);
exit(2);
}
SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, NULL);
SSL_CTX_load_verify_locations(ctx, CA, NULL);
if (SSL_CTX_use_certificate_file(ctx, CERTF, SSL_FILETYPE_PEM) <= 0) {
ERR_print_errors_fp(stderr);
exit(3);
}
if (SSL_CTX_use_PrivateKey_file(ctx, KEYF, SSL_FILETYPE_PEM) <= 0) {
ERR_print_errors_fp(stderr);
exit(4);
}

if (!SSL_CTX_check_private_key(ctx)) {
fprintf(stderr,"Private key does not match the certificate public key\n");
exit(5);
}

/* ----------------------------------------------- */
/* Prepare TCP socket for receiving connections */

listen_sd = socket (AF_INET, SOCK_STREAM, 0);   CHK_ERR(listen_sd, "socket");

memset (&sa_serv, '\0', sizeof(sa_serv));
sa_serv.sin_family      = AF_INET;
sa_serv.sin_addr.s_addr = INADDR_ANY;
sa_serv.sin_port        = htons (1111);          /* Server Port number */

err = bind(listen_sd, (struct sockaddr*) &sa_serv,
sizeof (sa_serv));                   CHK_ERR(err, "bind");

/* Receive a TCP connection. */

err = listen (listen_sd, 5);                    CHK_ERR(err, "listen");

client_len = sizeof(sa_cli);
sd = accept (listen_sd, (struct sockaddr*)&sa_cli, &client_len);
CHK_ERR(sd, "accept");
close (listen_sd);

printf ("Connection from %lx, port %x\n",
sa_cli.sin_addr.s_addr, sa_cli.sin_port);

/* ----------------------------------------------- */
/* TCP connection is ready. Do server side SSL. */

ssl = SSL_new (ctx);                           CHK_NULL(ssl);
SSL_set_fd (ssl, sd);
err = SSL_accept (ssl);                        CHK_SSL(err);

/* Get the cipher - opt */

printf ("SSL connection using %s\n", SSL_get_cipher (ssl));

/* Get client's certificate (note: beware of dynamic allocation) - opt */

client_cert = SSL_get_peer_certificate (ssl);
CHK_NULL(client_cert);
if (client_cert != NULL) {
printf ("Client certificate:\n");

str = X509_NAME_oneline (X509_get_subject_name (client_cert), 0, 0);
CHK_NULL(str);
printf ("\t subject: %s\n", str);
OPENSSL_free (str);

str = X509_NAME_oneline (X509_get_issuer_name  (client_cert), 0, 0);
CHK_NULL(str);
printf ("\t issuer: %s\n", str);
OPENSSL_free (str);

/* We could do all sorts of certificate verification stuff here before
deallocating the certificate. */

X509_free (client_cert);
} else
printf ("Client does not have certificate.\n");

/* DATA EXCHANGE - Receive message and send reply. */

err = SSL_read (ssl, buf, sizeof(buf) - 1);                   CHK_SSL(err);
buf[err] = '\0';
printf ("Got %d chars:'%s'\n", err, buf);

err = SSL_write (ssl, "I hear you.", strlen("I hear you."));  CHK_SSL(err);

/* Clean up. */

close (sd);
SSL_free (ssl);
SSL_CTX_free (ctx);
return 0;
}
/* EOF - serv.cpp */

客户端源代码：cli.cpp

/* cli.cpp  -  Minimal ssleay client for Unix
30.9.1996, Sampo Kellomaki <sampo@iki.fi> */

/* mangled to work with SSLeay-0.9.0b and OpenSSL 0.9.2b
Simplified to be even more minimal
12/98 - 4/99 Wade Scholine <wades@mail.cybg.com> */

#include <stdio.h>
#include <memory.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <unistd.h>

#include <openssl/crypto.h>
#include <openssl/x509.h>
#include <openssl/pem.h>
#include <openssl/ssl.h>
#include <openssl/err.h>

/* define HOME to be dir for key and cert files... */
#define HOME "./"
/* Make these what you want for cert & key files */
#define CA HOME "ca.crt"
#define CERTF  HOME "client.crt"
#define KEYF  HOME  "client.key"

#define CHK_NULL(x) if ((x)==NULL) exit (1)
#define CHK_ERR(err,s) if ((err)==-1) { perror(s); exit(1); }
#define CHK_SSL(err) if ((err)==-1) { ERR_print_errors_fp(stderr); exit(2); }

int main ()
{
int err;
int sd;
struct sockaddr_in sa;
SSL_CTX* ctx;
SSL*     ssl;
X509*    server_cert;
char*    str;
char     buf [4096];
//  SSL_METHOD *meth;
SSL_library_init();
SSLeay_add_ssl_algorithms();
// meth = SSLv2_client_method();
SSL_load_error_strings();
ctx = SSL_CTX_new (SSLv23_client_method());                 CHK_NULL(ctx);

CHK_SSL(err);

if (!ctx) {
ERR_print_errors_fp(stderr);
exit(2);
}
SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, NULL);
SSL_CTX_load_verify_locations(ctx, CA, NULL);

if (SSL_CTX_use_certificate_file(ctx, CERTF, SSL_FILETYPE_PEM) <= 0) {
ERR_print_errors_fp(stderr);
exit(3);
}
if (SSL_CTX_use_PrivateKey_file(ctx, KEYF, SSL_FILETYPE_PEM) <= 0) {
ERR_print_errors_fp(stderr);
exit(4);
}

if (!SSL_CTX_check_private_key(ctx)) {
fprintf(stderr,"Private key does not match the certificate public key\n");
exit(5);
}

/* ----------------------------------------------- */
/* Create a socket and connect to server using normal socket calls. */

sd = socket (AF_INET, SOCK_STREAM, 0);       CHK_ERR(sd, "socket");

memset (&sa, '\0', sizeof(sa));
sa.sin_family      = AF_INET;
sa.sin_addr.s_addr = inet_addr ("172.18.18.99");   /* Server IP */
sa.sin_port        = htons     (1111);          /* Server Port number */

err = connect(sd, (struct sockaddr*) &sa,
sizeof(sa));                   CHK_ERR(err, "connect");

/* ----------------------------------------------- */
/* Now we have TCP conncetion. Start SSL negotiation. */

ssl = SSL_new (ctx);                         CHK_NULL(ssl);
SSL_set_fd (ssl, sd);
err = SSL_connect (ssl);                     CHK_SSL(err);

/* Following two steps are optional and not required for
data exchange to be successful. */

/* Get the cipher - opt */

printf ("SSL connection using %s\n", SSL_get_cipher (ssl));

/* Get server's certificate (note: beware of dynamic allocation) - opt */

server_cert = SSL_get_peer_certificate (ssl);       CHK_NULL(server_cert);
printf ("Server certificate:\n");

str = X509_NAME_oneline (X509_get_subject_name (server_cert),0,0);
CHK_NULL(str);
printf ("\t subject: %s\n", str);
OPENSSL_free (str);

str = X509_NAME_oneline (X509_get_issuer_name  (server_cert),0,0);
CHK_NULL(str);
printf ("\t issuer: %s\n", str);
OPENSSL_free (str);

/* We could do all sorts of certificate verification stuff here before
deallocating the certificate. */

X509_free (server_cert);

/* --------------------------------------------------- */
/* DATA EXCHANGE - Send a message and receive a reply. */

err = SSL_write (ssl, "Hello World!", strlen("Hello World!"));  CHK_SSL(err);

err = SSL_read (ssl, buf, sizeof(buf) - 1);                     CHK_SSL(err);
buf[err] = '\0';
printf ("Got %d chars:'%s'\n", err, buf);
SSL_shutdown (ssl);  /* send SSL/
4000
TLS close_notify */

/* Clean up. */

close (sd);
SSL_free (ssl);
SSL_CTX_free (ctx);
return 0;
}
/* EOF - cli.cpp */

服务端编译：

g++ serv.cpp -lssl -lcrypto -o serv

.[gfj@KFJK ssl]$ ./serv 

Enter PEM pass phrase:

Connection from 631212ac, port 5904

SSL connection using AES256-SHA

Client certificate:

         subject: /C=CA/ST=hubei/O=no/OU=1/CN=1/emailAddress=1

         issuer: /C=CA/ST=hubei/L=guangzhou/O=no/OU=11/CN=11/emailAddress=11

Got 12 chars:'Hello World!'

客户端编译：

g++ cli.cpp -lssl -lcrypto -o cli

[gfj@KFJK ssl]$ ./cli

Enter PEM pass phrase:

SSL connection using AES256-SHA

Server certificate:

         subject: /C=CA/ST=hubei/O=no/OU=no/CN=no/emailAddress=fjgui@sina.com

         issuer: /C=CA/ST=hubei/L=guangzhou/O=no/OU=11/CN=11/emailAddress=11

Got 11 chars:'I hear you.'