I don't understand your verify callback, I have used it and when my program worked, with your verify_callback not. Can you explain to me how works or why you use it?
thanks
Shrikrishna Karandikar wrote:
Hi,I have been following the email exchanges regarding client certificate
verification by the server. I put together an SSL server from the sample
code and the discussions. But I could not get it to authenticate the client.
So I am pasting my server code below. Could someone please point out the
problems with my code? Thanks,The source code follows:
/* serv.cpp - Minimal ssleay server for Unix
30.9.1996, Sampo Kellomaki <[EMAIL PROTECTED]> *//* 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 <[EMAIL PROTECTED]> */#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>
#include <openssl/bn.h>/* define HOME to be dir for key and cert files... */
#define HOME "./"
/* Make these what you want for cert & key files */
#define CERTF HOME "foo-cert.pem"
#define KEYF HOME "foo-cert.pem"#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 verify_callback(int ok, X509_STORE_CTX *ctx)
{char buf[256];
X509 *err_cert;
int err,depth;err_cert=X509_STORE_CTX_get_current_cert(ctx);
err= X509_STORE_CTX_get_error(ctx);
depth= X509_STORE_CTX_get_error_depth(ctx);return ok;
}
void main (int argc, char **argv)
{
int err;
long verify_error;
int listen_sd;
int sd;
struct sockaddr_in sa_serv;
struct sockaddr_in sa_cli;
size_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 (meth);
if (!ctx) {
ERR_print_errors_fp(stderr);
exit(2);
}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);
}if (!SSL_CTX_load_verify_locations(ctx, CERTF, HOME)){
fprintf(stderr,"X509_load_verify_locations\n");
exit(6);
}
SSL_CTX_set_client_CA_list(ctx,SSL_load_client_CA_file(CERTF));
SSL_CTX_set_verify(ctx,
SSL_VERIFY_PEER|SSL_VERIFY_CLIENT_ONCE,verify_callback);/* ----------------------------------------------- */
/* 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 (atoi(argv[1]));
/* 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);
/* 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);
}
/* EOF - serv.cpp */The error I get on the client side is:
16234:error:1406C0C8:SSL routines:GET_SERVER_FINISHED:peer
error:s2_clnt.c:856:
Shri Karandikar,
Entera, Inc.
40971, Encyclopedia Circle,
Fremont,CA-94538.
Direct: 518.580.3707
Fax: 510.249.9180
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