Just like stdin and stdout, stderr is a copy of the listen socket inherited from inetd. We need to close it so inetd can process further requests, be restarted, etc. Sponsored by: Klara, Inc. Reviewed by: markj Differential Revision: https://reviews.freebsd.org/D38968
838 lines
20 KiB
C
838 lines
20 KiB
C
/*-
|
|
* SPDX-License-Identifier: BSD-3-Clause
|
|
*
|
|
* Copyright (c) 1983, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#ifndef lint
|
|
static const char copyright[] =
|
|
"@(#) Copyright (c) 1983, 1993\n\
|
|
The Regents of the University of California. All rights reserved.\n";
|
|
#endif /* not lint */
|
|
|
|
#ifndef lint
|
|
#if 0
|
|
static char sccsid[] = "@(#)tftpd.c 8.1 (Berkeley) 6/4/93";
|
|
#endif
|
|
#endif /* not lint */
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
/*
|
|
* Trivial file transfer protocol server.
|
|
*
|
|
* This version includes many modifications by Jim Guyton
|
|
* <guyton@rand-unix>.
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/time.h>
|
|
|
|
#include <netinet/in.h>
|
|
#include <arpa/tftp.h>
|
|
|
|
#include <ctype.h>
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <netdb.h>
|
|
#include <pwd.h>
|
|
#include <stdint.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <syslog.h>
|
|
#include <time.h>
|
|
#include <unistd.h>
|
|
|
|
#include "tftp-file.h"
|
|
#include "tftp-io.h"
|
|
#include "tftp-utils.h"
|
|
#include "tftp-transfer.h"
|
|
#include "tftp-options.h"
|
|
|
|
#ifdef LIBWRAP
|
|
#include <tcpd.h>
|
|
#endif
|
|
|
|
static void tftp_wrq(int peer, char *, ssize_t);
|
|
static void tftp_rrq(int peer, char *, ssize_t);
|
|
|
|
/*
|
|
* Null-terminated directory prefix list for absolute pathname requests and
|
|
* search list for relative pathname requests.
|
|
*
|
|
* MAXDIRS should be at least as large as the number of arguments that
|
|
* inetd allows (currently 20).
|
|
*/
|
|
#define MAXDIRS 20
|
|
static struct dirlist {
|
|
const char *name;
|
|
int len;
|
|
} dirs[MAXDIRS+1];
|
|
static int suppress_naks;
|
|
static int logging;
|
|
static int ipchroot;
|
|
static int create_new = 0;
|
|
static const char *newfile_format = "%Y%m%d";
|
|
static int increase_name = 0;
|
|
static mode_t mask = S_IWGRP | S_IWOTH;
|
|
|
|
struct formats;
|
|
static void tftp_recvfile(int peer, const char *mode);
|
|
static void tftp_xmitfile(int peer, const char *mode);
|
|
static int validate_access(int peer, char **, int);
|
|
static char peername[NI_MAXHOST];
|
|
|
|
static FILE *file;
|
|
|
|
static struct formats {
|
|
const char *f_mode;
|
|
int f_convert;
|
|
} formats[] = {
|
|
{ "netascii", 1 },
|
|
{ "octet", 0 },
|
|
{ NULL, 0 }
|
|
};
|
|
|
|
int
|
|
main(int argc, char *argv[])
|
|
{
|
|
struct tftphdr *tp;
|
|
int peer;
|
|
socklen_t peerlen, len;
|
|
ssize_t n;
|
|
int ch;
|
|
char *chroot_dir = NULL;
|
|
struct passwd *nobody;
|
|
const char *chuser = "nobody";
|
|
char recvbuffer[MAXPKTSIZE];
|
|
int allow_ro = 1, allow_wo = 1, on = 1;
|
|
pid_t pid;
|
|
|
|
tzset(); /* syslog in localtime */
|
|
acting_as_client = 0;
|
|
|
|
tftp_openlog("tftpd", LOG_PID | LOG_NDELAY, LOG_FTP);
|
|
while ((ch = getopt(argc, argv, "cCd::F:lnoOp:s:u:U:wW")) != -1) {
|
|
switch (ch) {
|
|
case 'c':
|
|
ipchroot = 1;
|
|
break;
|
|
case 'C':
|
|
ipchroot = 2;
|
|
break;
|
|
case 'd':
|
|
if (optarg == NULL)
|
|
debug++;
|
|
else if (atoi(optarg) != 0)
|
|
debug += atoi(optarg);
|
|
else
|
|
debug |= debug_finds(optarg);
|
|
break;
|
|
case 'F':
|
|
newfile_format = optarg;
|
|
break;
|
|
case 'l':
|
|
logging = 1;
|
|
break;
|
|
case 'n':
|
|
suppress_naks = 1;
|
|
break;
|
|
case 'o':
|
|
options_rfc_enabled = 0;
|
|
break;
|
|
case 'O':
|
|
options_extra_enabled = 0;
|
|
break;
|
|
case 'p':
|
|
packetdroppercentage = atoi(optarg);
|
|
tftp_log(LOG_INFO,
|
|
"Randomly dropping %d out of 100 packets",
|
|
packetdroppercentage);
|
|
break;
|
|
case 's':
|
|
chroot_dir = optarg;
|
|
break;
|
|
case 'u':
|
|
chuser = optarg;
|
|
break;
|
|
case 'U':
|
|
mask = strtol(optarg, NULL, 0);
|
|
break;
|
|
case 'w':
|
|
create_new = 1;
|
|
break;
|
|
case 'W':
|
|
create_new = 1;
|
|
increase_name = 1;
|
|
break;
|
|
default:
|
|
tftp_log(LOG_WARNING,
|
|
"ignoring unknown option -%c", ch);
|
|
}
|
|
}
|
|
if (optind < argc) {
|
|
struct dirlist *dirp;
|
|
|
|
/* Get list of directory prefixes. Skip relative pathnames. */
|
|
for (dirp = dirs; optind < argc && dirp < &dirs[MAXDIRS];
|
|
optind++) {
|
|
if (argv[optind][0] == '/') {
|
|
dirp->name = argv[optind];
|
|
dirp->len = strlen(dirp->name);
|
|
dirp++;
|
|
}
|
|
}
|
|
}
|
|
else if (chroot_dir) {
|
|
dirs->name = "/";
|
|
dirs->len = 1;
|
|
}
|
|
if (ipchroot > 0 && chroot_dir == NULL) {
|
|
tftp_log(LOG_ERR, "-c requires -s");
|
|
exit(1);
|
|
}
|
|
|
|
umask(mask);
|
|
|
|
if (ioctl(0, FIONBIO, &on) < 0) {
|
|
tftp_log(LOG_ERR, "ioctl(FIONBIO): %s", strerror(errno));
|
|
exit(1);
|
|
}
|
|
|
|
/* Find out who we are talking to and what we are going to do */
|
|
peerlen = sizeof(peer_sock);
|
|
n = recvfrom(0, recvbuffer, MAXPKTSIZE, 0,
|
|
(struct sockaddr *)&peer_sock, &peerlen);
|
|
if (n < 0) {
|
|
tftp_log(LOG_ERR, "recvfrom: %s", strerror(errno));
|
|
exit(1);
|
|
}
|
|
getnameinfo((struct sockaddr *)&peer_sock, peer_sock.ss_len,
|
|
peername, sizeof(peername), NULL, 0, NI_NUMERICHOST);
|
|
|
|
/*
|
|
* Now that we have read the message out of the UDP
|
|
* socket, we fork and exit. Thus, inetd will go back
|
|
* to listening to the tftp port, and the next request
|
|
* to come in will start up a new instance of tftpd.
|
|
*
|
|
* We do this so that inetd can run tftpd in "wait" mode.
|
|
* The problem with tftpd running in "nowait" mode is that
|
|
* inetd may get one or more successful "selects" on the
|
|
* tftp port before we do our receive, so more than one
|
|
* instance of tftpd may be started up. Worse, if tftpd
|
|
* break before doing the above "recvfrom", inetd would
|
|
* spawn endless instances, clogging the system.
|
|
*/
|
|
pid = fork();
|
|
if (pid < 0) {
|
|
tftp_log(LOG_ERR, "fork: %s", strerror(errno));
|
|
exit(1);
|
|
} else if (pid != 0) {
|
|
exit(0);
|
|
}
|
|
/* child */
|
|
|
|
#ifdef LIBWRAP
|
|
/*
|
|
* See if the client is allowed to talk to me.
|
|
* (This needs to be done before the chroot())
|
|
*/
|
|
{
|
|
struct request_info req;
|
|
|
|
request_init(&req, RQ_CLIENT_ADDR, peername, 0);
|
|
request_set(&req, RQ_DAEMON, "tftpd", 0);
|
|
|
|
if (hosts_access(&req) == 0) {
|
|
if (debug & DEBUG_ACCESS)
|
|
tftp_log(LOG_WARNING,
|
|
"Access denied by 'tftpd' entry "
|
|
"in /etc/hosts.allow");
|
|
|
|
/*
|
|
* Full access might be disabled, but maybe the
|
|
* client is allowed to do read-only access.
|
|
*/
|
|
request_set(&req, RQ_DAEMON, "tftpd-ro", 0);
|
|
allow_ro = hosts_access(&req);
|
|
|
|
request_set(&req, RQ_DAEMON, "tftpd-wo", 0);
|
|
allow_wo = hosts_access(&req);
|
|
|
|
if (allow_ro == 0 && allow_wo == 0) {
|
|
tftp_log(LOG_WARNING,
|
|
"Unauthorized access from %s", peername);
|
|
exit(1);
|
|
}
|
|
|
|
if (debug & DEBUG_ACCESS) {
|
|
if (allow_ro)
|
|
tftp_log(LOG_WARNING,
|
|
"But allowed readonly access "
|
|
"via 'tftpd-ro' entry");
|
|
if (allow_wo)
|
|
tftp_log(LOG_WARNING,
|
|
"But allowed writeonly access "
|
|
"via 'tftpd-wo' entry");
|
|
}
|
|
} else
|
|
if (debug & DEBUG_ACCESS)
|
|
tftp_log(LOG_WARNING,
|
|
"Full access allowed"
|
|
"in /etc/hosts.allow");
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Since we exit here, we should do that only after the above
|
|
* recvfrom to keep inetd from constantly forking should there
|
|
* be a problem. See the above comment about system clogging.
|
|
*/
|
|
if (chroot_dir) {
|
|
if (ipchroot > 0) {
|
|
char *tempchroot;
|
|
struct stat sb;
|
|
int statret;
|
|
struct sockaddr_storage ss;
|
|
char hbuf[NI_MAXHOST];
|
|
|
|
statret = -1;
|
|
memcpy(&ss, &peer_sock, peer_sock.ss_len);
|
|
unmappedaddr((struct sockaddr_in6 *)&ss);
|
|
getnameinfo((struct sockaddr *)&ss, ss.ss_len,
|
|
hbuf, sizeof(hbuf), NULL, 0,
|
|
NI_NUMERICHOST);
|
|
asprintf(&tempchroot, "%s/%s", chroot_dir, hbuf);
|
|
if (ipchroot == 2)
|
|
statret = stat(tempchroot, &sb);
|
|
if (ipchroot == 1 ||
|
|
(statret == 0 && (sb.st_mode & S_IFDIR)))
|
|
chroot_dir = tempchroot;
|
|
}
|
|
/* Must get this before chroot because /etc might go away */
|
|
if ((nobody = getpwnam(chuser)) == NULL) {
|
|
tftp_log(LOG_ERR, "%s: no such user", chuser);
|
|
exit(1);
|
|
}
|
|
if (chroot(chroot_dir)) {
|
|
tftp_log(LOG_ERR, "chroot: %s: %s",
|
|
chroot_dir, strerror(errno));
|
|
exit(1);
|
|
}
|
|
if (chdir("/") != 0) {
|
|
tftp_log(LOG_ERR, "chdir: %s", strerror(errno));
|
|
exit(1);
|
|
}
|
|
if (setgroups(1, &nobody->pw_gid) != 0) {
|
|
tftp_log(LOG_ERR, "setgroups failed");
|
|
exit(1);
|
|
}
|
|
if (setuid(nobody->pw_uid) != 0) {
|
|
tftp_log(LOG_ERR, "setuid failed");
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
len = sizeof(me_sock);
|
|
if (getsockname(0, (struct sockaddr *)&me_sock, &len) == 0) {
|
|
switch (me_sock.ss_family) {
|
|
case AF_INET:
|
|
((struct sockaddr_in *)&me_sock)->sin_port = 0;
|
|
break;
|
|
case AF_INET6:
|
|
((struct sockaddr_in6 *)&me_sock)->sin6_port = 0;
|
|
break;
|
|
default:
|
|
/* unsupported */
|
|
break;
|
|
}
|
|
} else {
|
|
memset(&me_sock, 0, sizeof(me_sock));
|
|
me_sock.ss_family = peer_sock.ss_family;
|
|
me_sock.ss_len = peer_sock.ss_len;
|
|
}
|
|
close(STDIN_FILENO);
|
|
close(STDOUT_FILENO);
|
|
close(STDERR_FILENO);
|
|
peer = socket(peer_sock.ss_family, SOCK_DGRAM, 0);
|
|
if (peer < 0) {
|
|
tftp_log(LOG_ERR, "socket: %s", strerror(errno));
|
|
exit(1);
|
|
}
|
|
if (bind(peer, (struct sockaddr *)&me_sock, me_sock.ss_len) < 0) {
|
|
tftp_log(LOG_ERR, "bind: %s", strerror(errno));
|
|
exit(1);
|
|
}
|
|
|
|
tp = (struct tftphdr *)recvbuffer;
|
|
tp->th_opcode = ntohs(tp->th_opcode);
|
|
if (tp->th_opcode == RRQ) {
|
|
if (allow_ro)
|
|
tftp_rrq(peer, tp->th_stuff, n - 1);
|
|
else {
|
|
tftp_log(LOG_WARNING,
|
|
"%s read access denied", peername);
|
|
exit(1);
|
|
}
|
|
} else if (tp->th_opcode == WRQ) {
|
|
if (allow_wo)
|
|
tftp_wrq(peer, tp->th_stuff, n - 1);
|
|
else {
|
|
tftp_log(LOG_WARNING,
|
|
"%s write access denied", peername);
|
|
exit(1);
|
|
}
|
|
} else
|
|
send_error(peer, EBADOP);
|
|
exit(1);
|
|
}
|
|
|
|
static void
|
|
reduce_path(char *fn)
|
|
{
|
|
char *slash, *ptr;
|
|
|
|
/* Reduce all "/+./" to "/" (just in case we've got "/./../" later */
|
|
while ((slash = strstr(fn, "/./")) != NULL) {
|
|
for (ptr = slash; ptr > fn && ptr[-1] == '/'; ptr--)
|
|
;
|
|
slash += 2;
|
|
while (*slash)
|
|
*++ptr = *++slash;
|
|
}
|
|
|
|
/* Now reduce all "/something/+../" to "/" */
|
|
while ((slash = strstr(fn, "/../")) != NULL) {
|
|
if (slash == fn)
|
|
break;
|
|
for (ptr = slash; ptr > fn && ptr[-1] == '/'; ptr--)
|
|
;
|
|
for (ptr--; ptr >= fn; ptr--)
|
|
if (*ptr == '/')
|
|
break;
|
|
if (ptr < fn)
|
|
break;
|
|
slash += 3;
|
|
while (*slash)
|
|
*++ptr = *++slash;
|
|
}
|
|
}
|
|
|
|
static char *
|
|
parse_header(int peer, char *recvbuffer, ssize_t size,
|
|
char **filename, char **mode)
|
|
{
|
|
char *cp;
|
|
int i;
|
|
struct formats *pf;
|
|
|
|
*mode = NULL;
|
|
cp = recvbuffer;
|
|
|
|
i = get_field(peer, recvbuffer, size);
|
|
if (i >= PATH_MAX) {
|
|
tftp_log(LOG_ERR, "Bad option - filename too long");
|
|
send_error(peer, EBADOP);
|
|
exit(1);
|
|
}
|
|
*filename = recvbuffer;
|
|
tftp_log(LOG_INFO, "Filename: '%s'", *filename);
|
|
cp += i;
|
|
|
|
i = get_field(peer, cp, size);
|
|
*mode = cp;
|
|
cp += i;
|
|
|
|
/* Find the file transfer mode */
|
|
for (cp = *mode; *cp; cp++)
|
|
if (isupper(*cp))
|
|
*cp = tolower(*cp);
|
|
for (pf = formats; pf->f_mode; pf++)
|
|
if (strcmp(pf->f_mode, *mode) == 0)
|
|
break;
|
|
if (pf->f_mode == NULL) {
|
|
tftp_log(LOG_ERR,
|
|
"Bad option - Unknown transfer mode (%s)", *mode);
|
|
send_error(peer, EBADOP);
|
|
exit(1);
|
|
}
|
|
tftp_log(LOG_INFO, "Mode: '%s'", *mode);
|
|
|
|
return (cp + 1);
|
|
}
|
|
|
|
/*
|
|
* WRQ - receive a file from the client
|
|
*/
|
|
void
|
|
tftp_wrq(int peer, char *recvbuffer, ssize_t size)
|
|
{
|
|
char *cp;
|
|
int has_options = 0, ecode;
|
|
char *filename, *mode;
|
|
char fnbuf[PATH_MAX];
|
|
|
|
cp = parse_header(peer, recvbuffer, size, &filename, &mode);
|
|
size -= (cp - recvbuffer) + 1;
|
|
|
|
strlcpy(fnbuf, filename, sizeof(fnbuf));
|
|
reduce_path(fnbuf);
|
|
filename = fnbuf;
|
|
|
|
if (size > 0) {
|
|
if (options_rfc_enabled)
|
|
has_options = !parse_options(peer, cp, size);
|
|
else
|
|
tftp_log(LOG_INFO, "Options found but not enabled");
|
|
}
|
|
|
|
ecode = validate_access(peer, &filename, WRQ);
|
|
if (ecode == 0) {
|
|
if (has_options)
|
|
send_oack(peer);
|
|
else
|
|
send_ack(peer, 0);
|
|
}
|
|
if (logging) {
|
|
tftp_log(LOG_INFO, "%s: write request for %s: %s", peername,
|
|
filename, errtomsg(ecode));
|
|
}
|
|
|
|
if (ecode) {
|
|
send_error(peer, ecode);
|
|
exit(1);
|
|
}
|
|
tftp_recvfile(peer, mode);
|
|
exit(0);
|
|
}
|
|
|
|
/*
|
|
* RRQ - send a file to the client
|
|
*/
|
|
void
|
|
tftp_rrq(int peer, char *recvbuffer, ssize_t size)
|
|
{
|
|
char *cp;
|
|
int has_options = 0, ecode;
|
|
char *filename, *mode;
|
|
char fnbuf[PATH_MAX];
|
|
|
|
cp = parse_header(peer, recvbuffer, size, &filename, &mode);
|
|
size -= (cp - recvbuffer) + 1;
|
|
|
|
strlcpy(fnbuf, filename, sizeof(fnbuf));
|
|
reduce_path(fnbuf);
|
|
filename = fnbuf;
|
|
|
|
if (size > 0) {
|
|
if (options_rfc_enabled)
|
|
has_options = !parse_options(peer, cp, size);
|
|
else
|
|
tftp_log(LOG_INFO, "Options found but not enabled");
|
|
}
|
|
|
|
ecode = validate_access(peer, &filename, RRQ);
|
|
if (ecode == 0) {
|
|
if (has_options) {
|
|
int n;
|
|
char lrecvbuffer[MAXPKTSIZE];
|
|
struct tftphdr *rp = (struct tftphdr *)lrecvbuffer;
|
|
|
|
send_oack(peer);
|
|
n = receive_packet(peer, lrecvbuffer, MAXPKTSIZE,
|
|
NULL, timeoutpacket);
|
|
if (n < 0) {
|
|
if (debug & DEBUG_SIMPLE)
|
|
tftp_log(LOG_DEBUG, "Aborting: %s",
|
|
rp_strerror(n));
|
|
return;
|
|
}
|
|
if (rp->th_opcode != ACK) {
|
|
if (debug & DEBUG_SIMPLE)
|
|
tftp_log(LOG_DEBUG,
|
|
"Expected ACK, got %s on OACK",
|
|
packettype(rp->th_opcode));
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (logging)
|
|
tftp_log(LOG_INFO, "%s: read request for %s: %s", peername,
|
|
filename, errtomsg(ecode));
|
|
|
|
if (ecode) {
|
|
/*
|
|
* Avoid storms of naks to a RRQ broadcast for a relative
|
|
* bootfile pathname from a diskless Sun.
|
|
*/
|
|
if (suppress_naks && *filename != '/' && ecode == ENOTFOUND)
|
|
exit(0);
|
|
send_error(peer, ecode);
|
|
exit(1);
|
|
}
|
|
tftp_xmitfile(peer, mode);
|
|
}
|
|
|
|
/*
|
|
* Find the next value for YYYYMMDD.nn when the file to be written should
|
|
* be unique. Due to the limitations of nn, we will fail if nn reaches 100.
|
|
* Besides, that is four updates per hour on a file, which is kind of
|
|
* execessive anyway.
|
|
*/
|
|
static int
|
|
find_next_name(char *filename, int *fd)
|
|
{
|
|
int i;
|
|
time_t tval;
|
|
size_t len;
|
|
struct tm lt;
|
|
char yyyymmdd[MAXPATHLEN];
|
|
char newname[MAXPATHLEN];
|
|
|
|
/* Create the YYYYMMDD part of the filename */
|
|
time(&tval);
|
|
lt = *localtime(&tval);
|
|
len = strftime(yyyymmdd, sizeof(yyyymmdd), newfile_format, <);
|
|
if (len == 0) {
|
|
syslog(LOG_WARNING,
|
|
"Filename suffix too long (%d characters maximum)",
|
|
MAXPATHLEN);
|
|
return (EACCESS);
|
|
}
|
|
|
|
/* Make sure the new filename is not too long */
|
|
if (strlen(filename) > MAXPATHLEN - len - 5) {
|
|
syslog(LOG_WARNING,
|
|
"Filename too long (%zd characters, %zd maximum)",
|
|
strlen(filename), MAXPATHLEN - len - 5);
|
|
return (EACCESS);
|
|
}
|
|
|
|
/* Find the first file which doesn't exist */
|
|
for (i = 0; i < 100; i++) {
|
|
sprintf(newname, "%s.%s.%02d", filename, yyyymmdd, i);
|
|
*fd = open(newname,
|
|
O_WRONLY | O_CREAT | O_EXCL,
|
|
S_IRUSR | S_IWUSR | S_IRGRP |
|
|
S_IWGRP | S_IROTH | S_IWOTH);
|
|
if (*fd > 0)
|
|
return 0;
|
|
}
|
|
|
|
return (EEXIST);
|
|
}
|
|
|
|
/*
|
|
* Validate file access. Since we
|
|
* have no uid or gid, for now require
|
|
* file to exist and be publicly
|
|
* readable/writable.
|
|
* If we were invoked with arguments
|
|
* from inetd then the file must also be
|
|
* in one of the given directory prefixes.
|
|
* Note also, full path name must be
|
|
* given as we have no login directory.
|
|
*/
|
|
int
|
|
validate_access(int peer, char **filep, int mode)
|
|
{
|
|
struct stat stbuf;
|
|
int fd;
|
|
int error;
|
|
struct dirlist *dirp;
|
|
static char pathname[MAXPATHLEN];
|
|
char *filename = *filep;
|
|
|
|
/*
|
|
* Prevent tricksters from getting around the directory restrictions
|
|
*/
|
|
if (strstr(filename, "/../"))
|
|
return (EACCESS);
|
|
|
|
if (*filename == '/') {
|
|
/*
|
|
* 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 (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 {
|
|
int err;
|
|
|
|
/*
|
|
* Relative file name: search the approved locations for it.
|
|
* Don't allow write requests that avoid directory
|
|
* restrictions.
|
|
*/
|
|
|
|
if (!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;
|
|
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 (mode == RRQ) {
|
|
if ((stbuf.st_mode & S_IROTH) != 0)
|
|
break;
|
|
} else {
|
|
if ((stbuf.st_mode & S_IWOTH) != 0)
|
|
break;
|
|
}
|
|
err = EACCESS;
|
|
}
|
|
}
|
|
if (dirp->name != NULL)
|
|
*filep = filename = pathname;
|
|
else if (mode == RRQ)
|
|
return (err);
|
|
else if (err != ENOTFOUND || !create_new)
|
|
return (err);
|
|
}
|
|
|
|
/*
|
|
* This option is handled here because it (might) require(s) the
|
|
* size of the file.
|
|
*/
|
|
option_tsize(peer, NULL, mode, &stbuf);
|
|
|
|
if (mode == RRQ)
|
|
fd = open(filename, O_RDONLY);
|
|
else {
|
|
if (create_new) {
|
|
if (increase_name) {
|
|
error = find_next_name(filename, &fd);
|
|
if (error > 0)
|
|
return (error + 100);
|
|
} else
|
|
fd = open(filename,
|
|
O_WRONLY | O_TRUNC | O_CREAT,
|
|
S_IRUSR | S_IWUSR | S_IRGRP |
|
|
S_IWGRP | S_IROTH | S_IWOTH );
|
|
} else
|
|
fd = open(filename, O_WRONLY | O_TRUNC);
|
|
}
|
|
if (fd < 0)
|
|
return (errno + 100);
|
|
file = fdopen(fd, (mode == RRQ)? "r":"w");
|
|
if (file == NULL) {
|
|
close(fd);
|
|
return (errno + 100);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
tftp_xmitfile(int peer, const char *mode)
|
|
{
|
|
uint16_t block;
|
|
time_t now;
|
|
struct tftp_stats ts;
|
|
|
|
memset(&ts, 0, sizeof(ts));
|
|
now = time(NULL);
|
|
if (debug & DEBUG_SIMPLE)
|
|
tftp_log(LOG_DEBUG, "Transmitting file");
|
|
|
|
read_init(0, file, mode);
|
|
block = 1;
|
|
tftp_send(peer, &block, &ts);
|
|
read_close();
|
|
if (debug & DEBUG_SIMPLE)
|
|
tftp_log(LOG_INFO, "Sent %jd bytes in %jd seconds",
|
|
(intmax_t)ts.amount, (intmax_t)time(NULL) - now);
|
|
}
|
|
|
|
static void
|
|
tftp_recvfile(int peer, const char *mode)
|
|
{
|
|
uint16_t block;
|
|
struct timeval now1, now2;
|
|
struct tftp_stats ts;
|
|
|
|
gettimeofday(&now1, NULL);
|
|
if (debug & DEBUG_SIMPLE)
|
|
tftp_log(LOG_DEBUG, "Receiving file");
|
|
|
|
write_init(0, file, mode);
|
|
|
|
block = 0;
|
|
tftp_receive(peer, &block, &ts, NULL, 0);
|
|
|
|
gettimeofday(&now2, NULL);
|
|
|
|
if (debug & DEBUG_SIMPLE) {
|
|
double f;
|
|
if (now1.tv_usec > now2.tv_usec) {
|
|
now2.tv_usec += 1000000;
|
|
now2.tv_sec--;
|
|
}
|
|
|
|
f = now2.tv_sec - now1.tv_sec +
|
|
(now2.tv_usec - now1.tv_usec) / 100000.0;
|
|
tftp_log(LOG_INFO,
|
|
"Download of %jd bytes in %d blocks completed after %0.1f seconds\n",
|
|
(intmax_t)ts.amount, block, f);
|
|
}
|
|
|
|
return;
|
|
}
|