WARNS?=1. merge lite-2.
This commit is contained in:
mrg
parent
7bcd5087e9
commit
60cef5019e
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@ -1,9 +1,10 @@
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# from: @(#)Makefile 5.10 (Berkeley) 5/11/90
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# $Id: Makefile,v 1.3 1994/12/22 10:28:22 cgd Exp $
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# $NetBSD: Makefile,v 1.4 1997/10/07 09:46:45 mrg Exp $
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# from: @(#)Makefile 8.1 (Berkeley) 6/4/93
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PROG= tftpd
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SRCS= tftpd.c tftpsubs.c
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MAN= tftpd.8
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CFLAGS+=-I${.CURDIR}/../../usr.bin/tftp
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.PATH: ${.CURDIR}/../../usr.bin/tftp
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.include <bsd.prog.mk>
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@ -1,5 +1,7 @@
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.\" Copyright (c) 1983, 1991 The Regents of the University of California.
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.\" All rights reserved.
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.\" $NetBSD: tftpd.8,v 1.4 1997/10/07 09:46:46 mrg Exp $
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.\"
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.\" Copyright (c) 1983, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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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 the following conditions
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@ -29,23 +31,22 @@
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" from: @(#)tftpd.8 6.7 (Berkeley) 5/13/91
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.\" $Id: tftpd.8,v 1.3 1994/01/10 16:29:46 mycroft Exp $
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.\"
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.Dd May 13, 1991
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.\" from: @(#)tftpd.8 8.1 (Berkeley) 6/4/93
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.\"
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.Dd June 4, 1993
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.Dt TFTPD 8
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.Os BSD 4.2
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.Sh NAME
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.Nm tftpd
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.Nd
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.Tn DARPA
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Trivial File Transfer Protocol server
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Internet Trivial File Transfer Protocol server
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.Sh SYNOPSIS
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.Nm tftpd
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.Op Fl s Ar directory
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.Op Fl l
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.Op Fl n
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.Op Ar directory ...
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.Nm tftpd
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.Fl s
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.Op Ar directory
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.Sh DESCRIPTION
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.Nm Tftpd
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is a server which supports the
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@ -70,6 +71,7 @@ Due to the lack of authentication information,
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.Nm tftpd
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will allow only publicly readable files to be
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accessed.
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Files containing the string ``/\|\fB.\|.\fP\|/'' are not allowed.
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Files may be written only if they already exist and are publicly writable.
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Note that this extends the concept of
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.Dq public
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@ -81,19 +83,31 @@ The server should have the user ID with the lowest possible privilege.
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.Pp
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Access to files may be restricted by invoking
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.Nm tftpd
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with a list of directories by including pathnames
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with a list of directories by including up to 20 pathnames
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as server program arguments in
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.Pa /etc/inetd.conf .
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In this case access is restricted to files whose
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names are prefixed by the one of the given directories.
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The given directories are also treated as a search path for
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relative filename requests.
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.Pp
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When using the
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.Fl s
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flag with a directory name, tftpd will
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The options are:
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.Bl -tag -width Ds
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.It Fl l
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Logs all requests using
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.Xr syslog 3 .
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.It Fl n
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Suppresses negative acknowledgement of requests for nonexistent
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relative filenames.
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.It Fl s
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.Nm
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will
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.Xr chroot 2
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on startup; therefore the remote host is not expected to pass the directory
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as part of the file name to transfer. This option is intended primarily for
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compatibility with SunOS boot ROMs which do not include a directory name.
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.El
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.Pp
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.Sh SEE ALSO
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.Xr tftp 1 ,
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.Xr inetd 8
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@ -1,6 +1,8 @@
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/* $NetBSD: tftpd.c,v 1.9 1997/10/07 09:46:47 mrg Exp $ */
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/*
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* Copyright (c) 1983 Regents of the University of California.
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* All rights reserved.
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. All rights reserved.
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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 the following conditions
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@ -31,41 +33,49 @@
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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char copyright[] =
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"@(#) Copyright (c) 1983 Regents of the University of California.\n\
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All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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/*static char sccsid[] = "from: @(#)tftpd.c 5.13 (Berkeley) 2/26/91";*/
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static char rcsid[] = "$Id: tftpd.c,v 1.8 1997/04/22 10:33:07 mrg Exp $";
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__COPYRIGHT("@(#) Copyright (c) 1983, 1993\n\
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The Regents of the University of California. All rights reserved.\n");
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#if 0
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static char sccsid[] = "@(#)tftpd.c 8.1 (Berkeley) 6/4/93";
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#else
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__RCSID("$NetBSD: tftpd.c,v 1.9 1997/10/07 09:46:47 mrg Exp $");
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#endif
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#endif /* not lint */
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/*
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* Trivial file transfer protocol server.
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*
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* This version includes many modifications by Jim Guyton <guyton@rand-unix>
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* This version includes many modifications by Jim Guyton
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* <guyton@rand-unix>.
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*/
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <sys/socket.h>
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#include <signal.h>
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#include <fcntl.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/tftp.h>
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#include <netdb.h>
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#include <arpa/inet.h>
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#include <setjmp.h>
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#include <syslog.h>
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#include <stdio.h>
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#include <errno.h>
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#include <ctype.h>
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#include <string.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <netdb.h>
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#include <setjmp.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <syslog.h>
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#include <unistd.h>
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#include "tftpsubs.h"
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/* XXX svr4 defines UID_NOBODY and GID_NOBODY constants in <sys/param.h> */
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#define UID_NOBODY 32767
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@ -73,9 +83,7 @@ static char rcsid[] = "$Id: tftpd.c,v 1.8 1997/04/22 10:33:07 mrg Exp $";
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#define TIMEOUT 5
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extern int errno;
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extern char *__progname;
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struct sockaddr_in s_in = { AF_INET };
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int peer;
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int rexmtval = TIMEOUT;
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int maxtimeout = 5*TIMEOUT;
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@ -86,10 +94,51 @@ char ackbuf[PKTSIZE];
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struct sockaddr_in from;
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int fromlen;
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#define MAXARG 4
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char *dirs[MAXARG+1];
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/*
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* Null-terminated directory prefix list for absolute pathname requests and
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* search list for relative pathname requests.
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*
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* MAXDIRS should be at least as large as the number of arguments that
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* inetd allows (currently 20).
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*/
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#define MAXDIRS 20
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static struct dirlist {
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char *name;
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int len;
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} dirs[MAXDIRS+1];
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static int suppress_naks;
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static int logging;
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static int secure;
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static char *securedir;
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int secure = 0;
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struct formats;
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static void tftp __P((struct tftphdr *, int));
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static char *errtomsg __P((int));
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static void nak __P((int));
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static char *verifyhost __P((struct sockaddr_in *));
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static void usage __P((void));
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void timer __P((int));
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void sendfile __P((struct formats *));
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void recvfile __P((struct formats *));
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void justquit __P((int));
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int validate_access __P((char **, int));
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int main __P((int, char **));
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struct formats {
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char *f_mode;
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int (*f_validate) __P((char **, int));
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void (*f_send) __P((struct formats *));
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void (*f_recv) __P((struct formats *));
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int f_convert;
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} formats[] = {
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{ "netascii", validate_access, sendfile, recvfile, 1 },
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{ "octet", validate_access, sendfile, recvfile, 0 },
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#ifdef notdef
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{ "mail", validate_user, sendmail, recvmail, 1 },
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#endif
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{ 0 }
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};
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static void
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usage()
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@ -98,22 +147,32 @@ usage()
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exit(1);
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}
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int
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main(argc, argv)
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int argc;
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char **argv;
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{
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register struct tftphdr *tp;
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register int n = 0;
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int on = 1;
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int ch, on;
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int fd = 0;
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int c;
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struct sockaddr_in sin;
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openlog("tftpd", LOG_PID, LOG_DAEMON);
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while ((c = getopt(argc, argv, "s")) != -1)
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switch (c) {
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while ((ch = getopt(argc, argv, "lns:")) != -1)
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switch (ch) {
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case 'l':
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logging = 1;
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break;
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case 'n':
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suppress_naks = 1;
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break;
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case 's':
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secure = 1;
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securedir = optarg;
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break;
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default:
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@ -121,23 +180,29 @@ main(argc, argv)
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break;
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}
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for (; optind != argc; optind++) {
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if (!secure) {
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if (n >= MAXARG) {
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syslog(LOG_ERR, "too many directories\n");
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exit(1);
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} else
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dirs[n++] = argv[optind];
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}
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if (chdir(argv[optind])) {
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syslog(LOG_ERR, "%s: %m\n", argv[optind]);
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exit(1);
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if (optind < argc) {
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struct dirlist *dirp;
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/* Get list of directory prefixes. Skip relative pathnames. */
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for (dirp = dirs; optind < argc && dirp < &dirs[MAXDIRS];
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optind++) {
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if (argv[optind][0] == '/') {
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dirp->name = argv[optind];
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dirp->len = strlen(dirp->name);
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dirp++;
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}
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}
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}
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if (secure && chroot(".")) {
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syslog(LOG_ERR, "chroot: %m\n");
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exit(1);
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if (secure) {
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if (chdir(securedir) < 0) {
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syslog(LOG_ERR, "chdir %s: %m", securedir);
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exit(1);
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}
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if (chroot(".")) {
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syslog(LOG_ERR, "chroot: %m\n");
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exit(1);
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}
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}
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if (setgid(GID_NOBODY)) {
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@ -155,6 +220,7 @@ main(argc, argv)
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exit(1);
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}
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on = 1;
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if (ioctl(fd, FIONBIO, &on) < 0) {
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syslog(LOG_ERR, "ioctl(FIONBIO): %m\n");
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exit(1);
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@ -226,7 +292,9 @@ main(argc, argv)
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syslog(LOG_ERR, "socket: %m\n");
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exit(1);
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}
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if (bind(peer, (struct sockaddr *)&s_in, sizeof (s_in)) < 0) {
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memset(&sin, 0, sizeof(sin));
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sin.sin_family = AF_INET;
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if (bind(peer, (struct sockaddr *)&sin, sizeof (sin)) < 0) {
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syslog(LOG_ERR, "bind: %m\n");
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exit(1);
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}
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@ -241,27 +309,10 @@ main(argc, argv)
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exit(1);
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}
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int validate_access();
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int sendfile(), recvfile();
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struct formats {
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char *f_mode;
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int (*f_validate)();
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int (*f_send)();
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int (*f_recv)();
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int f_convert;
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} formats[] = {
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{ "netascii", validate_access, sendfile, recvfile, 1 },
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{ "octet", validate_access, sendfile, recvfile, 0 },
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#ifdef notdef
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{ "mail", validate_user, sendmail, recvmail, 1 },
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#endif
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{ 0 }
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};
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/*
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* Handle initial connection protocol.
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*/
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static void
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tftp(tp, size)
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struct tftphdr *tp;
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int size;
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@ -269,7 +320,7 @@ tftp(tp, size)
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register char *cp;
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int first = 1, ecode;
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register struct formats *pf;
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char *filename, *mode;
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char *filename, *mode = NULL; /* XXX gcc */
|
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filename = cp = tp->th_stuff;
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again:
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|
|
@ -297,8 +348,20 @@ again:
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nak(EBADOP);
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exit(1);
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}
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ecode = (*pf->f_validate)(filename, tp->th_opcode);
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ecode = (*pf->f_validate)(&filename, tp->th_opcode);
|
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if (logging) {
|
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syslog(LOG_INFO, "%s: %s request for %s: %s",
|
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verifyhost(&from),
|
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tp->th_opcode == WRQ ? "write" : "read",
|
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filename, errtomsg(ecode));
|
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}
|
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if (ecode) {
|
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/*
|
||||
* Avoid storms of naks to a RRQ broadcast for a relative
|
||||
* bootfile pathname from a diskless Sun.
|
||||
*/
|
||||
if (suppress_naks && *filename != '/' && ecode == ENOTFOUND)
|
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exit(0);
|
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nak(ecode);
|
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exit(1);
|
||||
}
|
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|
|
@ -323,38 +386,84 @@ FILE *file;
|
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* Note also, full path name must be
|
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* given as we have no login directory.
|
||||
*/
|
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validate_access(filename, mode)
|
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char *filename;
|
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int
|
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validate_access(filep, mode)
|
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char **filep;
|
||||
int mode;
|
||||
{
|
||||
struct stat stbuf;
|
||||
int fd;
|
||||
char *cp, **dirp;
|
||||
struct dirlist *dirp;
|
||||
static char pathname[MAXPATHLEN];
|
||||
char *filename = *filep;
|
||||
|
||||
if (!secure) {
|
||||
if (*filename != '/')
|
||||
return (EACCESS);
|
||||
/*
|
||||
* Prevent tricksters from getting around the directory restrictions
|
||||
*/
|
||||
if (strstr(filename, "/../"))
|
||||
return (EACCESS);
|
||||
|
||||
if (*filename == '/') {
|
||||
/*
|
||||
* prevent tricksters from getting around the directory
|
||||
* restrictions
|
||||
* Allow the request if it's in one of the approved locations.
|
||||
* Special case: check the null prefix ("/") by looking
|
||||
* for length = 1 and relying on the arg. processing that
|
||||
* it's a /.
|
||||
*/
|
||||
for (cp = filename + 1; *cp; cp++)
|
||||
if(*cp == '.' && strncmp(cp-1, "/../", 4) == 0)
|
||||
return(EACCESS);
|
||||
for (dirp = dirs; *dirp; dirp++)
|
||||
if (strncmp(filename, *dirp, strlen(*dirp)) == 0)
|
||||
break;
|
||||
if (*dirp==0 && dirp!=dirs)
|
||||
return (EACCESS);
|
||||
}
|
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if (stat(filename, &stbuf) < 0)
|
||||
return (errno == ENOENT ? ENOTFOUND : EACCESS);
|
||||
if (mode == RRQ) {
|
||||
if ((stbuf.st_mode&(S_IREAD >> 6)) == 0)
|
||||
for (dirp = dirs; dirp->name != NULL; dirp++) {
|
||||
if (dirp->len == 1 ||
|
||||
(!strncmp(filename, dirp->name, dirp->len) &&
|
||||
filename[dirp->len] == '/'))
|
||||
break;
|
||||
}
|
||||
/* If directory list is empty, allow access to any file */
|
||||
if (dirp->name == NULL && dirp != dirs)
|
||||
return (EACCESS);
|
||||
if (stat(filename, &stbuf) < 0)
|
||||
return (errno == ENOENT ? ENOTFOUND : EACCESS);
|
||||
if ((stbuf.st_mode & S_IFMT) != S_IFREG)
|
||||
return (ENOTFOUND);
|
||||
if (mode == RRQ) {
|
||||
if ((stbuf.st_mode & S_IROTH) == 0)
|
||||
return (EACCESS);
|
||||
} else {
|
||||
if ((stbuf.st_mode & S_IWOTH) == 0)
|
||||
return (EACCESS);
|
||||
}
|
||||
} else {
|
||||
if ((stbuf.st_mode&(S_IWRITE >> 6)) == 0)
|
||||
int err;
|
||||
|
||||
/*
|
||||
* Relative file name: search the approved locations for it.
|
||||
* Don't allow write requests or ones that avoid directory
|
||||
* restrictions.
|
||||
*/
|
||||
|
||||
if (mode != RRQ || !strncmp(filename, "../", 3))
|
||||
return (EACCESS);
|
||||
|
||||
/*
|
||||
* If the file exists in one of the directories and isn't
|
||||
* readable, continue looking. However, change the error code
|
||||
* to give an indication that the file exists.
|
||||
*/
|
||||
err = ENOTFOUND;
|
||||
if (dirs[0].name != NULL) {
|
||||
for (dirp = dirs; dirp->name != NULL; dirp++) {
|
||||
snprintf(pathname, sizeof pathname, "%s/%s",
|
||||
dirp->name, filename);
|
||||
if (stat(pathname, &stbuf) == 0 &&
|
||||
(stbuf.st_mode & S_IFMT) == S_IFREG) {
|
||||
if ((stbuf.st_mode & S_IROTH) != 0)
|
||||
break;
|
||||
err = EACCESS;
|
||||
}
|
||||
}
|
||||
if (dirp->name == NULL)
|
||||
return (err);
|
||||
*filep = filename = pathname;
|
||||
} else
|
||||
*filep = filename;
|
||||
}
|
||||
fd = open(filename, mode == RRQ ? 0 : 1);
|
||||
if (fd < 0)
|
||||
|
|
@ -370,7 +479,8 @@ int timeout;
|
|||
jmp_buf timeoutbuf;
|
||||
|
||||
void
|
||||
timer()
|
||||
timer(dummy)
|
||||
int dummy;
|
||||
{
|
||||
|
||||
timeout += rexmtval;
|
||||
|
|
@ -382,16 +492,19 @@ timer()
|
|||
/*
|
||||
* Send the requested file.
|
||||
*/
|
||||
void
|
||||
sendfile(pf)
|
||||
struct formats *pf;
|
||||
{
|
||||
struct tftphdr *dp, *r_init();
|
||||
struct tftphdr *dp;
|
||||
register struct tftphdr *ap; /* ack packet */
|
||||
register int block = 1, size, n;
|
||||
register int size, n;
|
||||
volatile int block;
|
||||
|
||||
signal(SIGALRM, timer);
|
||||
dp = r_init();
|
||||
ap = (struct tftphdr *)ackbuf;
|
||||
block = 1;
|
||||
do {
|
||||
size = readit(file, &dp, pf->f_convert);
|
||||
if (size < 0) {
|
||||
|
|
@ -401,7 +514,7 @@ sendfile(pf)
|
|||
dp->th_opcode = htons((u_short)DATA);
|
||||
dp->th_block = htons((u_short)block);
|
||||
timeout = 0;
|
||||
(void) setjmp(timeoutbuf);
|
||||
(void)setjmp(timeoutbuf);
|
||||
|
||||
send_data:
|
||||
if (send(peer, dp, size + 4, 0) != size + 4) {
|
||||
|
|
@ -422,16 +535,14 @@ send_data:
|
|||
|
||||
if (ap->th_opcode == ERROR)
|
||||
goto abort;
|
||||
|
||||
|
||||
if (ap->th_opcode == ACK) {
|
||||
if (ap->th_block == block) {
|
||||
if (ap->th_block == block)
|
||||
break;
|
||||
}
|
||||
/* Re-synchronize with the other side */
|
||||
(void) synchnet(peer);
|
||||
if (ap->th_block == (block -1)) {
|
||||
if (ap->th_block == (block -1))
|
||||
goto send_data;
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
|
|
@ -442,25 +553,28 @@ abort:
|
|||
}
|
||||
|
||||
void
|
||||
justquit()
|
||||
justquit(dummy)
|
||||
int dummy;
|
||||
{
|
||||
exit(0);
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Receive a file.
|
||||
*/
|
||||
void
|
||||
recvfile(pf)
|
||||
struct formats *pf;
|
||||
{
|
||||
struct tftphdr *dp, *w_init();
|
||||
struct tftphdr *dp;
|
||||
register struct tftphdr *ap; /* ack buffer */
|
||||
register int block = 0, n, size;
|
||||
register int n, size;
|
||||
volatile int block;
|
||||
|
||||
signal(SIGALRM, timer);
|
||||
dp = w_init();
|
||||
ap = (struct tftphdr *)ackbuf;
|
||||
block = 0;
|
||||
do {
|
||||
timeout = 0;
|
||||
ap->th_opcode = htons((u_short)ACK);
|
||||
|
|
@ -538,12 +652,29 @@ struct errmsg {
|
|||
{ -1, 0 }
|
||||
};
|
||||
|
||||
static char *
|
||||
errtomsg(error)
|
||||
int error;
|
||||
{
|
||||
static char buf[20];
|
||||
register struct errmsg *pe;
|
||||
|
||||
if (error == 0)
|
||||
return "success";
|
||||
for (pe = errmsgs; pe->e_code >= 0; pe++)
|
||||
if (pe->e_code == error)
|
||||
return pe->e_msg;
|
||||
sprintf(buf, "error %d", error);
|
||||
return buf;
|
||||
}
|
||||
|
||||
/*
|
||||
* Send a nak packet (error message).
|
||||
* Error code passed in is one of the
|
||||
* standard TFTP codes, or a UNIX errno
|
||||
* offset by 100.
|
||||
*/
|
||||
static void
|
||||
nak(error)
|
||||
int error;
|
||||
{
|
||||
|
|
@ -568,3 +699,17 @@ nak(error)
|
|||
if (send(peer, buf, length, 0) != length)
|
||||
syslog(LOG_ERR, "nak: %m\n");
|
||||
}
|
||||
|
||||
static char *
|
||||
verifyhost(fromp)
|
||||
struct sockaddr_in *fromp;
|
||||
{
|
||||
struct hostent *hp;
|
||||
|
||||
hp = gethostbyaddr((char *)&fromp->sin_addr, sizeof (fromp->sin_addr),
|
||||
fromp->sin_family);
|
||||
if (hp)
|
||||
return hp->h_name;
|
||||
else
|
||||
return inet_ntoa(fromp->sin_addr);
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue