3b38646d13
Reviewed-by: Matt Caswell <gitlab@openssl.org>
1311 lines
37 KiB
C
1311 lines
37 KiB
C
/* -*- Mode: C; c-file-style: "bsd" -*- */
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/*-
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* easy-tls.c -- generic TLS proxy.
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* $Id: easy-tls.c,v 1.4 2002/03/05 09:07:16 bodo Exp $
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*/
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/*-
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(c) Copyright 1999 Bodo Moeller. All rights reserved.
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This is free software; you can redistributed and/or modify it
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unter the terms of either
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- the GNU General Public License as published by the
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Free Software Foundation, version 1, or (at your option)
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any later version,
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or
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- the following license:
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*/
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/*-
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that each of the following
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* conditions is met:
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*
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* 1. Redistributions qualify as "freeware" or "Open Source Software" under
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* one of the following terms:
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*
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* (a) Redistributions are made at no charge beyond the reasonable cost of
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* materials and delivery.
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*
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* (b) Redistributions are accompanied by a copy of the Source Code
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* or by an irrevocable offer to provide a copy of the Source Code
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* for up to three years at the cost of materials and delivery.
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* Such redistributions must allow further use, modification, and
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* redistribution of the Source Code under substantially the same
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* terms as this license.
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*
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* 2. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 3. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 4. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by Bodo Moeller."
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* (If available, substitute umlauted o for oe.)
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*
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* 5. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by Bodo Moeller."
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*
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* THIS SOFTWARE IS PROVIDED BY BODO MOELLER ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL BODO MOELLER OR
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* HIS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*-
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* Attribution for OpenSSL library:
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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* This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.openssl.org/)
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*/
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static char const rcsid[] =
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"$Id: easy-tls.c,v 1.4 2002/03/05 09:07:16 bodo Exp $";
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#include <assert.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/select.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <sys/utsname.h>
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#include <unistd.h>
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#include <openssl/crypto.h>
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#include <openssl/dh.h>
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#include <openssl/dsa.h>
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#include <openssl/err.h>
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#include <openssl/evp.h>
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#include <openssl/opensslv.h>
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#include <openssl/pem.h>
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#include <openssl/rand.h>
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#ifndef NO_RSA
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# include <openssl/rsa.h>
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#endif
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#include <openssl/ssl.h>
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#include <openssl/x509.h>
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#include <openssl/x509_vfy.h>
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#if OPENSSL_VERSION_NUMBER < 0x00904000L /* 0.9.4-dev */
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# error "This program needs OpenSSL 0.9.4 or later."
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#endif
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#include "easy-tls.h" /* include after <openssl/ssl.h> if both are
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* needed */
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#if TLS_INFO_SIZE > PIPE_BUF
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# if PIPE_BUF < 512
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# error "PIPE_BUF < 512" /* non-POSIX */
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# endif
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# error "TLS_INFO_SIZE > PIPE_BUF"
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#endif
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/*****************************************************************************/
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#ifdef TLS_APP
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# include TLS_APP
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#endif
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/*-
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* Applications can define:
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* TLS_APP_PROCESS_INIT -- void ...(int fd, int client_p, void *apparg)
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* TLS_CUMULATE_ERRORS
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* TLS_ERROR_BUFSIZ
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* TLS_APP_ERRFLUSH -- void ...(int child_p, char *, size_t, void *apparg)
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*/
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#ifndef TLS_APP_PROCESS_INIT
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# define TLS_APP_PROCESS_INIT(fd, client_p, apparg) ((void) 0)
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#endif
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#ifndef TLS_ERROR_BUFSIZ
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# define TLS_ERROR_BUFSIZ (10*160)
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#endif
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#if TLS_ERROR_BUFSIZ < 2 /* {'\n',0} */
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# error "TLS_ERROR_BUFSIZE is too small."
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#endif
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#ifndef TLS_APP_ERRFLUSH
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# define TLS_APP_ERRFLUSH tls_app_errflush
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static void
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tls_app_errflush(int child_p, char *errbuf, size_t num, void *apparg)
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{
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fputs(errbuf, stderr);
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}
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#endif
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/*****************************************************************************/
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#ifdef DEBUG_TLS
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# define DEBUG_MSG(x) fprintf(stderr," %s\n",x)
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# define DEBUG_MSG2(x,y) fprintf(stderr, " %s: %d\n",x,y)
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static int tls_loop_count = 0;
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static int tls_select_count = 0;
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#else
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# define DEBUG_MSG(x) (void)0
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# define DEBUG_MSG2(x,y) (void)0
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#endif
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static void tls_rand_seed_uniquely(void);
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static void tls_proxy(int clear_fd, int tls_fd, int info_fd, SSL_CTX *ctx,
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int client_p);
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static int tls_socket_nonblocking(int fd);
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static int tls_child_p = 0;
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static void *tls_child_apparg;
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struct tls_start_proxy_args tls_start_proxy_defaultargs(void)
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{
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struct tls_start_proxy_args ret;
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ret.fd = -1;
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ret.client_p = -1;
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ret.ctx = NULL;
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ret.pid = NULL;
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ret.infofd = NULL;
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return ret;
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}
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/*-
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* Slice in TLS proxy process at fd.
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* Return value:
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* 0 ok (*pid is set to child's PID if pid != NULL),
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* < 0 look at errno
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* > 0 other error
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* (return value encodes place of error)
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*
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*/
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int tls_start_proxy(struct tls_start_proxy_args a, void *apparg)
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{
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int fds[2] = { -1, -1 };
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int infofds[2] = { -1, -1 };
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int r, getfd, getfl;
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int ret;
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DEBUG_MSG2("tls_start_proxy fd", a.fd);
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DEBUG_MSG2("tls_start_proxy client_p", a.client_p);
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if (a.fd == -1 || a.client_p == -1 || a.ctx == NULL)
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return 1;
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if (a.pid != NULL) {
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*a.pid = 0;
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}
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if (a.infofd != NULL) {
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*a.infofd = -1;
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}
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r = socketpair(AF_UNIX, SOCK_STREAM, 0, fds);
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if (r == -1)
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return -1;
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if (a.fd >= FD_SETSIZE || fds[0] >= FD_SETSIZE) {
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ret = 2;
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goto err;
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}
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if (a.infofd != NULL) {
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r = pipe(infofds);
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if (r == -1) {
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ret = -3;
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goto err;
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}
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}
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r = fork();
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if (r == -1) {
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ret = -4;
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goto err;
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}
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if (r == 0) {
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DEBUG_MSG("fork");
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tls_child_p = 1;
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tls_child_apparg = apparg;
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close(fds[1]);
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if (infofds[0] != -1)
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close(infofds[0]);
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TLS_APP_PROCESS_INIT(a.fd, a.client_p, apparg);
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DEBUG_MSG("TLS_APP_PROCESS_INIT");
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tls_proxy(fds[0], a.fd, infofds[1], a.ctx, a.client_p);
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exit(0);
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}
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if (a.pid != NULL)
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*a.pid = r;
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if (infofds[1] != -1) {
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close(infofds[1]);
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infofds[1] = -1;
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}
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/* install fds[1] in place of fd: */
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close(fds[0]);
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fds[0] = -1;
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getfd = fcntl(a.fd, F_GETFD);
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getfl = fcntl(a.fd, F_GETFL);
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r = dup2(fds[1], a.fd);
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close(fds[1]);
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fds[1] = -1;
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if (r == -1) {
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ret = -5;
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goto err;
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}
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if (getfd != 1)
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fcntl(a.fd, F_SETFD, getfd);
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if (getfl & O_NONBLOCK)
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(void)tls_socket_nonblocking(a.fd);
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if (a.infofd != NULL)
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*a.infofd = infofds[0];
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return 0;
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err:
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if (fds[0] != -1)
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close(fds[0]);
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if (fds[1] != -1)
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close(fds[1]);
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if (infofds[0] != -1)
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close(infofds[0]);
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if (infofds[1] != -1)
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close(infofds[1]);
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return ret;
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}
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/*****************************************************************************/
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static char errbuf[TLS_ERROR_BUFSIZ];
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static size_t errbuf_i = 0;
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static void tls_errflush(void *apparg)
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{
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if (errbuf_i == 0)
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return;
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assert(errbuf_i < sizeof errbuf);
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assert(errbuf[errbuf_i] == 0);
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if (errbuf_i == sizeof errbuf - 1) {
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/* make sure we have a newline, even if string has been truncated */
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errbuf[errbuf_i - 1] = '\n';
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}
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/*
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* TLS_APP_ERRFLUSH may modify the string as needed, e.g. substitute
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* other characters for \n for convenience
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*/
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TLS_APP_ERRFLUSH(tls_child_p, errbuf, errbuf_i, apparg);
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errbuf_i = 0;
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}
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static void tls_errprintf(int flush, void *apparg, const char *fmt, ...)
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{
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va_list args;
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int r;
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if (errbuf_i < sizeof errbuf - 1) {
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size_t n;
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va_start(args, fmt);
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n = (sizeof errbuf) - errbuf_i;
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r = vsnprintf(errbuf + errbuf_i, n, fmt, args);
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if (r >= n)
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r = n - 1;
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if (r >= 0) {
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errbuf_i += r;
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} else {
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errbuf_i = sizeof errbuf - 1;
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errbuf[errbuf_i] = '\0';
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}
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assert(errbuf_i < sizeof errbuf);
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assert(errbuf[errbuf_i] == 0);
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}
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#ifndef TLS_CUMULATE_ERRORS
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tls_errflush(apparg);
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#else
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if (flush)
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tls_errflush(apparg);
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#endif
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}
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/*
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* app_prefix.. are for additional information provided by caller. If OpenSSL
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* error queue is empty, print default_text ("???" if NULL).
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*/
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static char *tls_openssl_errors(const char *app_prefix_1,
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const char *app_prefix_2,
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const char *default_text, void *apparg)
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{
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static char reasons[255];
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size_t reasons_i;
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unsigned long err;
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const char *file;
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int line;
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const char *data;
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int flags;
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char *errstring;
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int printed_something = 0;
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reasons_i = 0;
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assert(app_prefix_1 != NULL);
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assert(app_prefix_2 != NULL);
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if (default_text == NULL)
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default_text = "?" "?" "?";
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while ((err = ERR_get_error_line_data(&file, &line, &data, &flags)) != 0) {
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if (reasons_i < sizeof reasons) {
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size_t n;
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int r;
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n = (sizeof reasons) - reasons_i;
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r = snprintf(reasons + reasons_i, n, "%s%s",
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(reasons_i > 0 ? ", " : ""),
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ERR_reason_error_string(err));
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if (r >= n)
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r = n - 1;
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if (r >= 0) {
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reasons_i += r;
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} else {
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reasons_i = sizeof reasons;
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}
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assert(reasons_i <= sizeof reasons);
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}
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errstring = ERR_error_string(err, NULL);
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assert(errstring != NULL);
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tls_errprintf(0, apparg, "OpenSSL error%s%s: %s:%s:%d:%s\n",
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app_prefix_1, app_prefix_2, errstring, file, line,
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(flags & ERR_TXT_STRING) ? data : "");
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printed_something = 1;
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}
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if (!printed_something) {
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assert(reasons_i == 0);
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snprintf(reasons, sizeof reasons, "%s", default_text);
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tls_errprintf(0, apparg, "OpenSSL error%s%s: %s\n", app_prefix_1,
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app_prefix_2, default_text);
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}
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#ifdef TLS_CUMULATE_ERRORS
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tls_errflush(apparg);
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#endif
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assert(errbuf_i == 0);
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return reasons;
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}
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/*****************************************************************************/
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static int tls_init_done = 0;
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static int tls_init(void *apparg)
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{
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if (tls_init_done)
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return 0;
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SSL_load_error_strings();
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if (!SSL_library_init() /* aka SSLeay_add_ssl_algorithms() */ ) {
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tls_errprintf(1, apparg, "SSL_library_init failed.\n");
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return -1;
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}
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tls_init_done = 1;
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tls_rand_seed();
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return 0;
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}
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/*****************************************************************************/
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static void tls_rand_seed_uniquely(void)
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{
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struct {
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pid_t pid;
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time_t time;
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void *stack;
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} data;
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data.pid = getpid();
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data.time = time(NULL);
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data.stack = (void *)&data;
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RAND_seed((const void *)&data, sizeof data);
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}
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void tls_rand_seed(void)
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{
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struct {
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struct utsname uname;
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int uname_1;
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int uname_2;
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uid_t uid;
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uid_t euid;
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gid_t gid;
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gid_t egid;
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} data;
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data.uname_1 = uname(&data.uname);
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data.uname_2 = errno; /* Let's hope that uname fails randomly :-) */
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|
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data.uid = getuid();
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data.euid = geteuid();
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data.gid = getgid();
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data.egid = getegid();
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RAND_seed((const void *)&data, sizeof data);
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tls_rand_seed_uniquely();
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}
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|
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static int tls_rand_seeded_p = 0;
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|
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#define my_MIN_SEED_BYTES 256 /* struct stat can be larger than 128 */
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int tls_rand_seed_from_file(const char *filename, size_t n, void *apparg)
|
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{
|
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/*
|
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* Seed OpenSSL's random number generator from file. Try to read n bytes
|
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* if n > 0, whole file if n == 0.
|
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*/
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int r;
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if (tls_init(apparg) == -1)
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return -1;
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tls_rand_seed();
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|
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r = RAND_load_file(filename,
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(n > 0 && n < LONG_MAX) ? (long)n : LONG_MAX);
|
|
/*
|
|
* r is the number of bytes filled into the random number generator,
|
|
* which are taken from "stat(filename, ...)" in addition to the file
|
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* contents.
|
|
*/
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assert(1 < my_MIN_SEED_BYTES);
|
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/*
|
|
* We need to detect at least those cases when the file does not exist at
|
|
* all. With current versions of OpenSSL, this should do it:
|
|
*/
|
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if (n == 0)
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n = my_MIN_SEED_BYTES;
|
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if (r < n) {
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tls_errprintf(1, apparg,
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"rand_seed_from_file: could not read %d bytes from %s.\n",
|
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n, filename);
|
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return -1;
|
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} else {
|
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tls_rand_seeded_p = 1;
|
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return 0;
|
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}
|
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}
|
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|
|
void tls_rand_seed_from_memory(const void *buf, size_t n)
|
|
{
|
|
size_t i = 0;
|
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|
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while (i < n) {
|
|
size_t rest = n - i;
|
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int chunk = rest < INT_MAX ? (int)rest : INT_MAX;
|
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RAND_seed((const char *)buf + i, chunk);
|
|
i += chunk;
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|
}
|
|
tls_rand_seeded_p = 1;
|
|
}
|
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|
|
/*****************************************************************************/
|
|
|
|
struct tls_x509_name_string {
|
|
char str[100];
|
|
};
|
|
|
|
static void
|
|
tls_get_x509_subject_name_oneline(X509 *cert,
|
|
struct tls_x509_name_string *namestring)
|
|
{
|
|
X509_NAME *name;
|
|
|
|
if (cert == NULL) {
|
|
namestring->str[0] = '\0';
|
|
return;
|
|
}
|
|
|
|
name = X509_get_subject_name(cert); /* does not increment any reference
|
|
* counter */
|
|
|
|
assert(sizeof namestring->str >= 4); /* "?" or "...", plus 0 */
|
|
|
|
if (name == NULL) {
|
|
namestring->str[0] = '?';
|
|
namestring->str[1] = 0;
|
|
} else {
|
|
size_t len;
|
|
|
|
X509_NAME_oneline(name, namestring->str, sizeof namestring->str);
|
|
len = strlen(namestring->str);
|
|
assert(namestring->str[len] == 0);
|
|
assert(len < sizeof namestring->str);
|
|
|
|
if (len + 1 == sizeof namestring->str) {
|
|
/*
|
|
* (Probably something was cut off.) Does not really work --
|
|
* X509_NAME_oneline truncates after name components, we cannot
|
|
* tell from the result whether anything is missing.
|
|
*/
|
|
|
|
assert(namestring->str[len] == 0);
|
|
namestring->str[--len] = '.';
|
|
namestring->str[--len] = '.';
|
|
namestring->str[--len] = '.';
|
|
}
|
|
}
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
|
|
/* to hinder OpenSSL from asking for passphrases */
|
|
static int no_passphrase_callback(char *buf, int num, int w, void *arg)
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
#if OPENSSL_VERSION_NUMBER >= 0x00907000L
|
|
static int verify_dont_fail_cb(X509_STORE_CTX *c, void *unused_arg)
|
|
#else
|
|
static int verify_dont_fail_cb(X509_STORE_CTX *c)
|
|
#endif
|
|
{
|
|
int i;
|
|
|
|
i = X509_verify_cert(c); /* sets c->error */
|
|
#if OPENSSL_VERSION_NUMBER >= 0x00905000L /* don't allow unverified
|
|
* certificates -- they could
|
|
* survive session reuse, but
|
|
* OpenSSL < 0.9.5-dev does not
|
|
* preserve their verify_result */
|
|
if (i == 0)
|
|
return 1;
|
|
else
|
|
#endif
|
|
return i;
|
|
}
|
|
|
|
static DH *tls_dhe1024 = NULL; /* generating these takes a while, so do it
|
|
* just once */
|
|
|
|
void tls_set_dhe1024(int i, void *apparg)
|
|
{
|
|
DSA *dsaparams;
|
|
DH *dhparams;
|
|
const char *seed[] = { ";-) :-( :-) :-( ",
|
|
";-) :-( :-) :-( ",
|
|
"Random String no. 12",
|
|
";-) :-( :-) :-( ",
|
|
"hackers have even mo", /* from jargon file */
|
|
};
|
|
unsigned char seedbuf[20];
|
|
|
|
tls_init(apparg);
|
|
if (i >= 0) {
|
|
i %= sizeof seed / sizeof seed[0];
|
|
assert(strlen(seed[i]) == 20);
|
|
memcpy(seedbuf, seed[i], 20);
|
|
dsaparams =
|
|
DSA_generate_parameters(1024, seedbuf, 20, NULL, NULL, 0, NULL);
|
|
} else {
|
|
/* random parameters (may take a while) */
|
|
dsaparams =
|
|
DSA_generate_parameters(1024, NULL, 0, NULL, NULL, 0, NULL);
|
|
}
|
|
|
|
if (dsaparams == NULL) {
|
|
tls_openssl_errors("", "", NULL, apparg);
|
|
return;
|
|
}
|
|
dhparams = DSA_dup_DH(dsaparams);
|
|
DSA_free(dsaparams);
|
|
if (dhparams == NULL) {
|
|
tls_openssl_errors("", "", NULL, apparg);
|
|
return;
|
|
}
|
|
if (tls_dhe1024 != NULL)
|
|
DH_free(tls_dhe1024);
|
|
tls_dhe1024 = dhparams;
|
|
}
|
|
|
|
struct tls_create_ctx_args tls_create_ctx_defaultargs(void)
|
|
{
|
|
struct tls_create_ctx_args ret;
|
|
|
|
ret.client_p = 0;
|
|
ret.certificate_file = NULL;
|
|
ret.key_file = NULL;
|
|
ret.ca_file = NULL;
|
|
ret.verify_depth = -1;
|
|
ret.fail_unless_verified = 0;
|
|
ret.export_p = 0;
|
|
|
|
return ret;
|
|
}
|
|
|
|
SSL_CTX *tls_create_ctx(struct tls_create_ctx_args a, void *apparg)
|
|
{
|
|
int r;
|
|
static long context_num = 0;
|
|
SSL_CTX *ret;
|
|
const char *err_pref_1 = "", *err_pref_2 = "";
|
|
|
|
if (tls_init(apparg) == -1)
|
|
return NULL;
|
|
|
|
ret =
|
|
SSL_CTX_new((a.client_p ? SSLv23_client_method :
|
|
SSLv23_server_method) ());
|
|
|
|
if (ret == NULL)
|
|
goto err;
|
|
|
|
SSL_CTX_set_default_passwd_cb(ret, no_passphrase_callback);
|
|
SSL_CTX_set_mode(ret, SSL_MODE_ENABLE_PARTIAL_WRITE);
|
|
|
|
if ((a.certificate_file != NULL) || (a.key_file != NULL)) {
|
|
if (a.key_file == NULL) {
|
|
tls_errprintf(1, apparg, "Need a key file.\n");
|
|
goto err_return;
|
|
}
|
|
if (a.certificate_file == NULL) {
|
|
tls_errprintf(1, apparg, "Need a certificate chain file.\n");
|
|
goto err_return;
|
|
}
|
|
|
|
if (!SSL_CTX_use_PrivateKey_file(ret, a.key_file, SSL_FILETYPE_PEM))
|
|
goto err;
|
|
if (!tls_rand_seeded_p) {
|
|
/*
|
|
* particularly paranoid people may not like this -- so provide
|
|
* your own random seeding before calling this
|
|
*/
|
|
if (tls_rand_seed_from_file(a.key_file, 0, apparg) == -1)
|
|
goto err_return;
|
|
}
|
|
if (!SSL_CTX_use_certificate_chain_file(ret, a.certificate_file))
|
|
goto err;
|
|
if (!SSL_CTX_check_private_key(ret)) {
|
|
tls_errprintf(1, apparg,
|
|
"Private key \"%s\" does not match certificate \"%s\".\n",
|
|
a.key_file, a.certificate_file);
|
|
goto err_peek;
|
|
}
|
|
}
|
|
|
|
if ((a.ca_file != NULL) || (a.verify_depth > 0)) {
|
|
context_num++;
|
|
r = SSL_CTX_set_session_id_context(ret, (const void *)&context_num,
|
|
(unsigned int)sizeof context_num);
|
|
if (!r)
|
|
goto err;
|
|
|
|
SSL_CTX_set_verify(ret,
|
|
SSL_VERIFY_PEER | (a.fail_unless_verified ?
|
|
SSL_VERIFY_FAIL_IF_NO_PEER_CERT
|
|
: 0), 0);
|
|
if (!a.fail_unless_verified)
|
|
SSL_CTX_set_cert_verify_callback(ret, verify_dont_fail_cb, NULL);
|
|
|
|
if (a.verify_depth > 0)
|
|
SSL_CTX_set_verify_depth(ret, a.verify_depth);
|
|
|
|
if (a.ca_file != NULL) {
|
|
/* does not report failure if file does not exist ... */
|
|
/* NULL argument means no CA-directory */
|
|
r = SSL_CTX_load_verify_locations(ret, a.ca_file, NULL);
|
|
if (!r) {
|
|
err_pref_1 = " while processing certificate file ";
|
|
err_pref_2 = a.ca_file;
|
|
goto err;
|
|
}
|
|
|
|
if (!a.client_p) {
|
|
/*
|
|
* SSL_load_client_CA_file is a misnomer, it just creates a
|
|
* list of CNs.
|
|
*/
|
|
SSL_CTX_set_client_CA_list(ret,
|
|
SSL_load_client_CA_file
|
|
(a.ca_file));
|
|
/*
|
|
* SSL_CTX_set_client_CA_list does not have a return value;
|
|
* it does not really need one, but make sure (we really test
|
|
* if SSL_load_client_CA_file worked)
|
|
*/
|
|
if (SSL_CTX_get_client_CA_list(ret) == NULL) {
|
|
tls_errprintf(1, apparg,
|
|
"Could not set client CA list from \"%s\".\n",
|
|
a.ca_file);
|
|
goto err_peek;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!a.client_p) {
|
|
if (tls_dhe1024 == NULL) {
|
|
int i;
|
|
|
|
if (RAND_bytes((unsigned char *)&i, sizeof i) <= 0)
|
|
goto err_return;
|
|
/*
|
|
* make sure that i is non-negative -- pick one of the provided
|
|
* seeds
|
|
*/
|
|
if (i < 0)
|
|
i = -i;
|
|
if (i < 0)
|
|
i = 0;
|
|
tls_set_dhe1024(i, apparg);
|
|
if (tls_dhe1024 == NULL)
|
|
goto err_return;
|
|
}
|
|
|
|
if (!SSL_CTX_set_tmp_dh(ret, tls_dhe1024))
|
|
goto err;
|
|
|
|
/* avoid small subgroup attacks: */
|
|
SSL_CTX_set_options(ret, SSL_OP_SINGLE_DH_USE);
|
|
}
|
|
#ifndef NO_RSA
|
|
if (!a.client_p && a.export_p) {
|
|
RSA *tmpkey;
|
|
|
|
tmpkey = RSA_generate_key(512, RSA_F4, 0, NULL);
|
|
if (tmpkey == NULL)
|
|
goto err;
|
|
if (!SSL_CTX_set_tmp_rsa(ret, tmpkey)) {
|
|
RSA_free(tmpkey);
|
|
goto err;
|
|
}
|
|
RSA_free(tmpkey); /* SSL_CTX_set_tmp_rsa uses a duplicate. */
|
|
}
|
|
#endif
|
|
|
|
return ret;
|
|
|
|
err_peek:
|
|
if (!ERR_peek_error())
|
|
goto err_return;
|
|
err:
|
|
tls_openssl_errors(err_pref_1, err_pref_2, NULL, apparg);
|
|
err_return:
|
|
if (ret != NULL)
|
|
SSL_CTX_free(ret);
|
|
return NULL;
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
|
|
static int tls_socket_nonblocking(int fd)
|
|
{
|
|
int v, r;
|
|
|
|
v = fcntl(fd, F_GETFL, 0);
|
|
if (v == -1) {
|
|
if (errno == EINVAL)
|
|
return 0; /* already shut down -- ignore */
|
|
return -1;
|
|
}
|
|
r = fcntl(fd, F_SETFL, v | O_NONBLOCK);
|
|
if (r == -1) {
|
|
if (errno == EINVAL)
|
|
return 0; /* already shut down -- ignore */
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int max(int a, int b)
|
|
{
|
|
return a > b ? a : b;
|
|
}
|
|
|
|
/* timeout, -1 means no timeout */
|
|
static void
|
|
tls_sockets_select(int read_select_1, int read_select_2, int write_select_1,
|
|
int write_select_2, int seconds)
|
|
{
|
|
int maxfd, n;
|
|
fd_set reads, writes;
|
|
struct timeval timeout;
|
|
struct timeval *timeout_p;
|
|
|
|
assert(read_select_1 >= -1 && read_select_2 >= -1 && write_select_1 >= -1
|
|
&& write_select_2 >= -1);
|
|
assert(read_select_1 < FD_SETSIZE && read_select_2 < FD_SETSIZE - 1
|
|
&& write_select_1 < FD_SETSIZE - 1
|
|
&& write_select_2 < FD_SETSIZE - 1);
|
|
|
|
maxfd =
|
|
max(max(read_select_1, read_select_2),
|
|
max(write_select_1, write_select_2));
|
|
assert(maxfd >= 0);
|
|
|
|
FD_ZERO(&reads);
|
|
FD_ZERO(&writes);
|
|
|
|
for (n = 0; n < 4; ++n) {
|
|
int i = n % 2;
|
|
int w = n >= 2;
|
|
/* loop over all (i, w) in {0,1}x{0,1} */
|
|
int fd;
|
|
|
|
if (i == 0 && w == 0)
|
|
fd = read_select_1;
|
|
else if (i == 1 && w == 0)
|
|
fd = read_select_2;
|
|
else if (i == 0 && w == 1)
|
|
fd = write_select_1;
|
|
else {
|
|
assert(i == 1 && w == 1);
|
|
fd = write_select_2;
|
|
}
|
|
|
|
if (fd >= 0) {
|
|
if (w == 0)
|
|
FD_SET(fd, &reads);
|
|
else /* w == 1 */
|
|
FD_SET(fd, &writes);
|
|
}
|
|
}
|
|
|
|
if (seconds >= 0) {
|
|
timeout.tv_sec = seconds;
|
|
timeout.tv_usec = 0;
|
|
timeout_p = &timeout;
|
|
} else
|
|
timeout_p = NULL;
|
|
|
|
DEBUG_MSG2("select no.", ++tls_select_count);
|
|
select(maxfd + 1, &reads, &writes, (fd_set *) NULL, timeout_p);
|
|
DEBUG_MSG("cont.");
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
|
|
#define TUNNELBUFSIZE (16*1024)
|
|
struct tunnelbuf {
|
|
char buf[TUNNELBUFSIZE];
|
|
size_t len;
|
|
size_t offset;
|
|
};
|
|
|
|
static int tls_connect_attempt(SSL *, int *write_select, int *read_select,
|
|
int *closed, int *progress,
|
|
const char **err_pref);
|
|
|
|
static int tls_accept_attempt(SSL *, int *write_select, int *read_select,
|
|
int *closed, int *progress,
|
|
const char **err_pref);
|
|
|
|
static int tls_write_attempt(SSL *, struct tunnelbuf *, int *write_select,
|
|
int *read_select, int *closed, int *progress,
|
|
const char **err_pref);
|
|
|
|
static int tls_read_attempt(SSL *, struct tunnelbuf *, int *write_select,
|
|
int *read_select, int *closed, int *progress,
|
|
const char **err_pref);
|
|
|
|
static int write_attempt(int fd, struct tunnelbuf *, int *select, int *closed,
|
|
int *progress);
|
|
|
|
static int read_attempt(int fd, struct tunnelbuf *, int *select, int *closed,
|
|
int *progress);
|
|
|
|
static void write_info(SSL *ssl, int *info_fd)
|
|
{
|
|
if (*info_fd != -1) {
|
|
long v;
|
|
int v_ok;
|
|
struct tls_x509_name_string peer;
|
|
char infobuf[TLS_INFO_SIZE];
|
|
int r;
|
|
|
|
DEBUG_MSG("write_info");
|
|
v = SSL_get_verify_result(ssl);
|
|
v_ok = (v == X509_V_OK) ? 'A' : 'E'; /* Auth./Error */
|
|
{
|
|
X509 *peercert;
|
|
|
|
peercert = SSL_get_peer_certificate(ssl);
|
|
tls_get_x509_subject_name_oneline(peercert, &peer);
|
|
if (peercert != NULL)
|
|
X509_free(peercert);
|
|
}
|
|
if (peer.str[0] == '\0')
|
|
v_ok = '0'; /* no cert at all */
|
|
else if (strchr(peer.str, '\n')) {
|
|
/* should not happen, but make sure */
|
|
*strchr(peer.str, '\n') = '\0';
|
|
}
|
|
r = snprintf(infobuf, sizeof infobuf, "%c:%s\n%s\n", v_ok,
|
|
X509_verify_cert_error_string(v), peer.str);
|
|
DEBUG_MSG2("snprintf", r);
|
|
if (r == -1 || r >= sizeof infobuf)
|
|
r = sizeof infobuf - 1;
|
|
write(*info_fd, infobuf, r);
|
|
close(*info_fd);
|
|
*info_fd = -1;
|
|
}
|
|
}
|
|
|
|
/* tls_proxy expects that all fds are closed after return */
|
|
static void
|
|
tls_proxy(int clear_fd, int tls_fd, int info_fd, SSL_CTX *ctx, int client_p)
|
|
{
|
|
struct tunnelbuf clear_to_tls, tls_to_clear;
|
|
SSL *ssl;
|
|
BIO *rbio, *wbio;
|
|
int closed, in_handshake;
|
|
const char *err_pref_1 = "", *err_pref_2 = "";
|
|
const char *err_def = NULL;
|
|
|
|
assert(clear_fd != -1);
|
|
assert(tls_fd != -1);
|
|
assert(clear_fd < FD_SETSIZE);
|
|
assert(tls_fd < FD_SETSIZE);
|
|
/* info_fd may be -1 */
|
|
assert(ctx != NULL);
|
|
|
|
tls_rand_seed_uniquely();
|
|
|
|
tls_socket_nonblocking(clear_fd);
|
|
DEBUG_MSG2("clear_fd", clear_fd);
|
|
tls_socket_nonblocking(tls_fd);
|
|
DEBUG_MSG2("tls_fd", tls_fd);
|
|
|
|
ssl = SSL_new(ctx);
|
|
if (ssl == NULL)
|
|
goto err;
|
|
DEBUG_MSG("SSL_new");
|
|
if (!SSL_set_fd(ssl, tls_fd))
|
|
goto err;
|
|
rbio = SSL_get_rbio(ssl);
|
|
wbio = SSL_get_wbio(ssl); /* should be the same, but who cares */
|
|
assert(rbio != NULL);
|
|
assert(wbio != NULL);
|
|
if (client_p)
|
|
SSL_set_connect_state(ssl);
|
|
else
|
|
SSL_set_accept_state(ssl);
|
|
|
|
closed = 0;
|
|
in_handshake = 1;
|
|
tls_to_clear.len = 0;
|
|
tls_to_clear.offset = 0;
|
|
clear_to_tls.len = 0;
|
|
clear_to_tls.offset = 0;
|
|
|
|
err_def = "I/O error";
|
|
|
|
/*
|
|
* loop finishes as soon as we detect that one side closed; when all
|
|
* (program and OS) buffers have enough space, the data from the last
|
|
* succesful read in each direction is transferred before close
|
|
*/
|
|
do {
|
|
int clear_read_select = 0, clear_write_select = 0,
|
|
tls_read_select = 0, tls_write_select = 0, progress = 0;
|
|
int r;
|
|
unsigned long num_read = BIO_number_read(rbio),
|
|
num_written = BIO_number_written(wbio);
|
|
|
|
DEBUG_MSG2("loop iteration", ++tls_loop_count);
|
|
|
|
if (in_handshake) {
|
|
DEBUG_MSG("in_handshake");
|
|
if (client_p)
|
|
r = tls_connect_attempt(ssl, &tls_write_select,
|
|
&tls_read_select, &closed, &progress,
|
|
&err_pref_1);
|
|
else
|
|
r = tls_accept_attempt(ssl, &tls_write_select,
|
|
&tls_read_select, &closed, &progress,
|
|
&err_pref_1);
|
|
if (r != 0) {
|
|
write_info(ssl, &info_fd);
|
|
goto err;
|
|
}
|
|
if (closed)
|
|
goto err_return;
|
|
if (!SSL_in_init(ssl)) {
|
|
in_handshake = 0;
|
|
write_info(ssl, &info_fd);
|
|
}
|
|
}
|
|
|
|
if (clear_to_tls.len != 0 && !in_handshake) {
|
|
assert(!closed);
|
|
|
|
r = tls_write_attempt(ssl, &clear_to_tls, &tls_write_select,
|
|
&tls_read_select, &closed, &progress,
|
|
&err_pref_1);
|
|
if (r != 0)
|
|
goto err;
|
|
if (closed) {
|
|
assert(progress);
|
|
tls_to_clear.offset = 0;
|
|
tls_to_clear.len = 0;
|
|
}
|
|
}
|
|
|
|
if (tls_to_clear.len != 0) {
|
|
assert(!closed);
|
|
|
|
r = write_attempt(clear_fd, &tls_to_clear, &clear_write_select,
|
|
&closed, &progress);
|
|
if (r != 0)
|
|
goto err_return;
|
|
if (closed) {
|
|
assert(progress);
|
|
clear_to_tls.offset = 0;
|
|
clear_to_tls.len = 0;
|
|
}
|
|
}
|
|
|
|
if (!closed) {
|
|
if (clear_to_tls.offset + clear_to_tls.len <
|
|
sizeof clear_to_tls.buf) {
|
|
r = read_attempt(clear_fd, &clear_to_tls, &clear_read_select,
|
|
&closed, &progress);
|
|
if (r != 0)
|
|
goto err_return;
|
|
if (closed) {
|
|
r = SSL_shutdown(ssl);
|
|
DEBUG_MSG2("SSL_shutdown", r);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!closed && !in_handshake) {
|
|
if (tls_to_clear.offset + tls_to_clear.len <
|
|
sizeof tls_to_clear.buf) {
|
|
r = tls_read_attempt(ssl, &tls_to_clear, &tls_write_select,
|
|
&tls_read_select, &closed, &progress,
|
|
&err_pref_1);
|
|
if (r != 0)
|
|
goto err;
|
|
if (closed) {
|
|
r = SSL_shutdown(ssl);
|
|
DEBUG_MSG2("SSL_shutdown", r);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!progress) {
|
|
DEBUG_MSG("!progress?");
|
|
if (num_read != BIO_number_read(rbio)
|
|
|| num_written != BIO_number_written(wbio))
|
|
progress = 1;
|
|
|
|
if (!progress) {
|
|
DEBUG_MSG("!progress");
|
|
assert(clear_read_select || tls_read_select
|
|
|| clear_write_select || tls_write_select);
|
|
tls_sockets_select(clear_read_select ? clear_fd : -1,
|
|
tls_read_select ? tls_fd : -1,
|
|
clear_write_select ? clear_fd : -1,
|
|
tls_write_select ? tls_fd : -1, -1);
|
|
}
|
|
}
|
|
} while (!closed);
|
|
return;
|
|
|
|
err:
|
|
tls_openssl_errors(err_pref_1, err_pref_2, err_def, tls_child_apparg);
|
|
err_return:
|
|
return;
|
|
}
|
|
|
|
static int
|
|
tls_get_error(SSL *ssl, int r, int *write_select, int *read_select,
|
|
int *closed, int *progress)
|
|
{
|
|
int err = SSL_get_error(ssl, r);
|
|
|
|
if (err == SSL_ERROR_NONE) {
|
|
assert(r > 0);
|
|
*progress = 1;
|
|
return 0;
|
|
}
|
|
|
|
assert(r <= 0);
|
|
|
|
switch (err) {
|
|
case SSL_ERROR_ZERO_RETURN:
|
|
assert(r == 0);
|
|
*closed = 1;
|
|
*progress = 1;
|
|
return 0;
|
|
|
|
case SSL_ERROR_WANT_WRITE:
|
|
*write_select = 1;
|
|
return 0;
|
|
|
|
case SSL_ERROR_WANT_READ:
|
|
*read_select = 1;
|
|
return 0;
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
static int
|
|
tls_connect_attempt(SSL *ssl, int *write_select, int *read_select,
|
|
int *closed, int *progress, const char **err_pref)
|
|
{
|
|
int n, r;
|
|
|
|
DEBUG_MSG("tls_connect_attempt");
|
|
n = SSL_connect(ssl);
|
|
DEBUG_MSG2("SSL_connect", n);
|
|
r = tls_get_error(ssl, n, write_select, read_select, closed, progress);
|
|
if (r == -1)
|
|
*err_pref = " during SSL_connect";
|
|
return r;
|
|
}
|
|
|
|
static int
|
|
tls_accept_attempt(SSL *ssl, int *write_select, int *read_select, int *closed,
|
|
int *progress, const char **err_pref)
|
|
{
|
|
int n, r;
|
|
|
|
DEBUG_MSG("tls_accept_attempt");
|
|
n = SSL_accept(ssl);
|
|
DEBUG_MSG2("SSL_accept", n);
|
|
r = tls_get_error(ssl, n, write_select, read_select, closed, progress);
|
|
if (r == -1)
|
|
*err_pref = " during SSL_accept";
|
|
return r;
|
|
}
|
|
|
|
static int
|
|
tls_write_attempt(SSL *ssl, struct tunnelbuf *buf, int *write_select,
|
|
int *read_select, int *closed, int *progress,
|
|
const char **err_pref)
|
|
{
|
|
int n, r;
|
|
|
|
DEBUG_MSG("tls_write_attempt");
|
|
n = SSL_write(ssl, buf->buf + buf->offset, buf->len);
|
|
DEBUG_MSG2("SSL_write", n);
|
|
r = tls_get_error(ssl, n, write_select, read_select, closed, progress);
|
|
if (n > 0) {
|
|
buf->len -= n;
|
|
assert(buf->len >= 0);
|
|
if (buf->len == 0)
|
|
buf->offset = 0;
|
|
else
|
|
buf->offset += n;
|
|
}
|
|
if (r == -1)
|
|
*err_pref = " during SSL_write";
|
|
return r;
|
|
}
|
|
|
|
static int
|
|
tls_read_attempt(SSL *ssl, struct tunnelbuf *buf, int *write_select,
|
|
int *read_select, int *closed, int *progress,
|
|
const char **err_pref)
|
|
{
|
|
int n, r;
|
|
size_t total;
|
|
|
|
DEBUG_MSG("tls_read_attempt");
|
|
total = buf->offset + buf->len;
|
|
assert(total < sizeof buf->buf);
|
|
n = SSL_read(ssl, buf->buf + total, (sizeof buf->buf) - total);
|
|
DEBUG_MSG2("SSL_read", n);
|
|
r = tls_get_error(ssl, n, write_select, read_select, closed, progress);
|
|
if (n > 0) {
|
|
buf->len += n;
|
|
assert(buf->offset + buf->len <= sizeof buf->buf);
|
|
}
|
|
if (r == -1)
|
|
*err_pref = " during SSL_read";
|
|
return r;
|
|
}
|
|
|
|
static int get_error(int r, int *select, int *closed, int *progress)
|
|
{
|
|
if (r >= 0) {
|
|
*progress = 1;
|
|
if (r == 0)
|
|
*closed = 1;
|
|
return 0;
|
|
} else {
|
|
assert(r == -1);
|
|
if (errno == EAGAIN || errno == EWOULDBLOCK) {
|
|
*select = 1;
|
|
return 0;
|
|
} else if (errno == EPIPE) {
|
|
*progress = 1;
|
|
*closed = 1;
|
|
return 0;
|
|
} else
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
static int write_attempt(int fd, struct tunnelbuf *buf, int *select,
|
|
int *closed, int *progress)
|
|
{
|
|
int n, r;
|
|
|
|
DEBUG_MSG("write_attempt");
|
|
n = write(fd, buf->buf + buf->offset, buf->len);
|
|
DEBUG_MSG2("write", n);
|
|
r = get_error(n, select, closed, progress);
|
|
if (n > 0) {
|
|
buf->len -= n;
|
|
assert(buf->len >= 0);
|
|
if (buf->len == 0)
|
|
buf->offset = 0;
|
|
else
|
|
buf->offset += n;
|
|
}
|
|
if (r == -1)
|
|
tls_errprintf(1, tls_child_apparg, "write error: %s\n",
|
|
strerror(errno));
|
|
return r;
|
|
}
|
|
|
|
static int
|
|
read_attempt(int fd, struct tunnelbuf *buf, int *select, int *closed,
|
|
int *progress)
|
|
{
|
|
int n, r;
|
|
size_t total;
|
|
|
|
DEBUG_MSG("read_attempt");
|
|
total = buf->offset + buf->len;
|
|
assert(total < sizeof buf->buf);
|
|
n = read(fd, buf->buf + total, (sizeof buf->buf) - total);
|
|
DEBUG_MSG2("read", n);
|
|
r = get_error(n, select, closed, progress);
|
|
if (n > 0) {
|
|
buf->len += n;
|
|
assert(buf->offset + buf->len <= sizeof buf->buf);
|
|
}
|
|
if (r == -1)
|
|
tls_errprintf(1, tls_child_apparg, "read error: %s\n",
|
|
strerror(errno));
|
|
return r;
|
|
}
|