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/*
Unix SMB/Netbios implementation.
Version 1.9.
SSLeay utility functions
Copyright (C) Christian Starkjohann <cs@obdev.at> 1998
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifdef WITH_SSL /* should always be defined if this module is compiled */
#include "includes.h"
#include <ssl.h>
#include <err.h>
BOOL sslEnabled;
SSL *ssl = NULL;
int sslFd = -1;
static SSL_CTX *sslContext = NULL;
extern int DEBUGLEVEL;
static int ssl_verify_cb(int ok, X509_STORE_CTX *ctx)
{
char buffer[256];
X509_NAME_oneline(X509_get_issuer_name(ctx->current_cert),
buffer, sizeof(buffer));
if(ok){
DEBUG(0, ("SSL: Certificate OK: %s\n", buffer));
}else{
switch (ctx->error){
case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
DEBUG(0, ("SSL: Cert error: CA not known: %s\n", buffer));
break;
case X509_V_ERR_CERT_NOT_YET_VALID:
DEBUG(0, ("SSL: Cert error: Cert not yet valid: %s\n", buffer));
break;
case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
DEBUG(0, ("SSL: Cert error: illegal \'not before\' field: %s\n",
buffer));
break;
case X509_V_ERR_CERT_HAS_EXPIRED:
DEBUG(0, ("SSL: Cert error: Cert expired: %s\n", buffer));
break;
case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
DEBUG(0, ("SSL: Cert error: invalid \'not after\' field: %s\n",
buffer));
break;
default:
DEBUG(0, ("SSL: Cert error: unknown error %d in %s\n", ctx->error,
buffer));
break;
}
}
return ok;
}
static RSA *ssl_temp_rsa_cb(SSL *ssl, int export)
{
static RSA *rsa = NULL;
if(rsa == NULL)
rsa = RSA_generate_key(512, RSA_F4, NULL, NULL);
return rsa;
}
/* This is called before we fork. It should ask the user for the pass phrase
* if necessary. Error output can still go to stderr because the process
* has a terminal.
*/
int sslutil_init(int isServer)
{
int err;
char *certfile, *keyfile, *ciphers, *cacertDir, *cacertFile;
SSL_load_error_strings();
SSLeay_add_ssl_algorithms();
switch(lp_ssl_version()){
case SMB_SSL_V2: sslContext = SSL_CTX_new(SSLv2_method()); break;
case SMB_SSL_V3: sslContext = SSL_CTX_new(SSLv3_method()); break;
default:
case SMB_SSL_V23: sslContext = SSL_CTX_new(SSLv23_method()); break;
case SMB_SSL_TLS1: sslContext = SSL_CTX_new(TLSv1_method()); break;
}
if(sslContext == NULL){
err = ERR_get_error();
fprintf(stderr, "SSL: Error allocating context: %s\n",
ERR_error_string(err, NULL));
exit(1);
}
if(lp_ssl_compatibility()){
SSL_CTX_set_options(sslContext, SSL_OP_ALL);
}
certfile = isServer ? lp_ssl_cert() : lp_ssl_client_cert();
if((certfile == NULL || *certfile == 0) && isServer){
fprintf(stderr, "SSL: No cert file specified in config file!\n");
fprintf(stderr, "The server MUST have a certificate!\n");
exit(1);
}
keyfile = isServer ? lp_ssl_privkey() : lp_ssl_client_privkey();
if(keyfile == NULL || *keyfile == 0)
keyfile = certfile;
if(certfile != NULL && *certfile != 0){
if(!SSL_CTX_use_certificate_file(sslContext, certfile, SSL_FILETYPE_PEM)){
err = ERR_get_error();
fprintf(stderr, "SSL: error reading certificate from file %s: %s\n",
certfile, ERR_error_string(err, NULL));
exit(1);
}
if(!SSL_CTX_use_PrivateKey_file(sslContext, keyfile, SSL_FILETYPE_PEM)){
err = ERR_get_error();
fprintf(stderr, "SSL: error reading private key from file %s: %s\n",
keyfile, ERR_error_string(err, NULL));
exit(1);
}
if(!SSL_CTX_check_private_key(sslContext)){
err = ERR_get_error();
fprintf(stderr, "SSL: Private key does not match public key in cert!\n");
exit(1);
}
}
cacertDir = lp_ssl_cacertdir();
cacertFile = lp_ssl_cacertfile();
if(cacertDir != NULL && *cacertDir == 0)
cacertDir = NULL;
if(cacertFile != NULL && *cacertFile == 0)
cacertFile = NULL;
if(!SSL_CTX_load_verify_locations(sslContext, cacertFile, cacertDir)){
err = ERR_get_error();
fprintf(stderr, "SSL: Error error setting CA cert locations: %s\n",
ERR_error_string(err, NULL));
fprintf(stderr, "trying default locations.\n");
cacertFile = cacertDir = NULL;
if(!SSL_CTX_set_default_verify_paths(sslContext)){
err = ERR_get_error();
fprintf(stderr, "SSL: Error error setting default CA cert location: %s\n",
ERR_error_string(err, NULL));
exit(1);
}
}
SSL_CTX_set_tmp_rsa_callback(sslContext, ssl_temp_rsa_cb);
if((ciphers = lp_ssl_ciphers()) != NULL && *ciphers != 0)
SSL_CTX_set_cipher_list(sslContext, ciphers);
if((isServer && lp_ssl_reqClientCert()) || (!isServer && lp_ssl_reqServerCert())){
SSL_CTX_set_verify(sslContext,
SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT, ssl_verify_cb);
}else{
SSL_CTX_set_verify(sslContext, SSL_VERIFY_NONE, ssl_verify_cb);
}
#if 1 /* don't know what this is good for, but s_server in SSLeay does it, too */
if(isServer){
SSL_CTX_set_client_CA_list(sslContext, SSL_load_client_CA_file(certfile));
}
#endif
return 0;
}
int sslutil_accept(int fd)
{
int err;
if(ssl != NULL){
DEBUG(0, ("SSL: internal error: more than one SSL connection (server)\n"));
return -1;
}
if((ssl = SSL_new(sslContext)) == NULL){
err = ERR_get_error();
DEBUG(0, ("SSL: Error allocating handle: %s\n",
ERR_error_string(err, NULL)));
return -1;
}
SSL_set_fd(ssl, fd);
sslFd = fd;
if(SSL_accept(ssl) <= 0){
err = ERR_get_error();
DEBUG(0, ("SSL: Error accepting on socket: %s\n",
ERR_error_string(err, NULL)));
return -1;
}
DEBUG(0, ("SSL: negotiated cipher: %s\n", SSL_get_cipher(ssl)));
return 0;
}
int sslutil_fd_is_ssl(int fd)
{
return fd == sslFd;
}
int sslutil_connect(int fd)
{
int err;
if(ssl != NULL){
DEBUG(0, ("SSL: internal error: more than one SSL connection (client)\n"));
return -1;
}
if((ssl = SSL_new(sslContext)) == NULL){
err = ERR_get_error();
DEBUG(0, ("SSL: Error allocating handle: %s\n",
ERR_error_string(err, NULL)));
return -1;
}
SSL_set_fd(ssl, fd);
sslFd = fd;
if(SSL_connect(ssl) <= 0){
err = ERR_get_error();
DEBUG(0, ("SSL: Error conencting socket: %s\n",
ERR_error_string(err, NULL)));
return -1;
}
DEBUG(0, ("SSL: negotiated cipher: %s\n", SSL_get_cipher(ssl)));
return 0;
}
int sslutil_disconnect(int fd)
{
if(fd == sslFd && ssl != NULL){
SSL_free(ssl);
ssl = NULL;
sslFd = -1;
}
return 0;
}
int sslutil_negotiate_ssl(int fd, int msg_type)
{
unsigned char buf[5] = {0x83, 0, 0, 1, 0x81};
char *reqHosts, *resignHosts;
reqHosts = lp_ssl_hosts();
resignHosts = lp_ssl_hosts_resign();
if(!allow_access(resignHosts, reqHosts, client_name(fd), client_addr(fd))){
sslEnabled = False;
return 0;
}
if(msg_type != 0x81){ /* first packet must be a session request */
DEBUG( 0, ( "Client %s did not use session setup; access denied\n",
client_addr(fd) ) );
send_smb(fd, (char *)buf);
return -1;
}
buf[4] = 0x8e; /* negative session response: use SSL */
send_smb(fd, (char *)buf);
if(sslutil_accept(fd) != 0){
DEBUG( 0, ( "Client %s failed SSL negotiation!\n", client_addr(fd) ) );
return -1;
}
return 1;
}
#else /* WITH_SSL */
void ssl_dummy(void) {;} /* So some compilers don't complain. */
#endif /* WITH_SSL */
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