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/* Released under GPLv2 with exception for the OpenSSL library. See license.txt */
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <openssl/ssl.h>
#include <openssl/bio.h>
#include <openssl/evp.h>
#include <openssl/x509.h>
#include <openssl/md5.h>
#include "gen.h"
#include "mssl.h"
BIO *bio_err=0;
char close_ssl_connection(SSL *ssl_h, int socket_h)
{
int rc = SSL_shutdown(ssl_h);
if (!rc)
{
shutdown(socket_h, 1);
rc = SSL_shutdown(ssl_h);
}
/* rc == 0 means try again but it seems to be fine
* to ignore that is what I read from the manpage
*/
if (rc == -1)
return -1;
else
return 0;
}
int READ_SSL(SSL *ssl_h, char *whereto, int len)
{
int cnt=len;
while(len>0)
{
int rc;
rc = SSL_read(ssl_h, whereto, len);
if (rc == -1)
{
if (errno != EINTR && errno != EAGAIN)
{
sprintf(last_error, "READ_SSL: io-error: %s\n", strerror(errno));
return -1;
}
}
else if (rc == 0)
{
return 0;
}
else
{
whereto += rc;
len -= rc;
}
}
return cnt;
}
int WRITE_SSL(SSL *ssl_h, char *whereto, int len)
{
int cnt=len;
while(len>0)
{
int rc;
rc = SSL_write(ssl_h, whereto, len);
if (rc == -1)
{
if (errno != EINTR && errno != EAGAIN)
{
sprintf(last_error, "WRITE_SSL: io-error: %s\n", strerror(errno));
return -1;
}
}
else if (rc == 0)
{
return 0;
}
else
{
whereto += rc;
len -= rc;
}
}
return cnt;
}
int connect_ssl(int socket_h, SSL_CTX *client_ctx, SSL **ssl_h, BIO **s_bio, int timeout)
{
int dummy;
// FIXME handle t/o
#if 0
int rc;
struct timeval to;
fd_set rfds;
FD_ZERO(&rfds);
FD_SET(socket_h, &rfds);
to.tv_sec = timeout / 1000;
to.tv_usec = (timeout - (to.tv_sec * 1000)) * 1000;
/* wait for connection */
rc = select(socket_h + 1, &rfds, NULL, NULL, &to);
if (rc == 0)
return -2; /* timeout */
else if (rc == -1)
{
if (errno == EINTR)
return -3; /* ^C pressed */
else
return -1; /* error */
}
#endif
*ssl_h = SSL_new(client_ctx);
*s_bio = BIO_new_socket(socket_h, BIO_NOCLOSE);
SSL_set_bio(*ssl_h, *s_bio, *s_bio);
dummy = SSL_connect(*ssl_h);
if (dummy <= 0)
{
sprintf(last_error, "problem starting SSL connection: %d\n", SSL_get_error(*ssl_h, dummy));
return -1;
}
return 0;
}
SSL_CTX * initialize_ctx(void)
{
if (!bio_err)
{
SSL_library_init();
SSL_load_error_strings();
/* error write context */
bio_err = BIO_new_fp(stderr, BIO_NOCLOSE);
}
/* create context */
const SSL_METHOD *meth = SSLv23_method();
return SSL_CTX_new(meth);
}
char * get_fingerprint(SSL *ssl_h)
{
char *string = NULL;
unsigned char fp_digest[EVP_MAX_MD_SIZE];
X509 *x509_data = SSL_get_peer_certificate(ssl_h);
if (x509_data)
{
unsigned int fp_digest_size = sizeof(fp_digest);
memset(fp_digest, 0x00, sizeof(fp_digest));
if (X509_digest(x509_data, EVP_md5(), fp_digest, &fp_digest_size))
{
string = (char *)malloc(MD5_DIGEST_LENGTH * 3 + 1);
if (string)
{
int loop, pos =0;
for(loop=0; loop<MD5_DIGEST_LENGTH; loop++)
{
if (loop)
pos += sprintf(&string[pos], ":%02x", fp_digest[loop]);
else
pos = sprintf(&string[pos], "%02x", fp_digest[loop]);
}
}
}
X509_free(x509_data);
}
return string;
}
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