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/* $NetBSD: ftpd.c,v 1.148 2002/12/06 01:59:22 thorpej Exp $ */
/*
* Copyright (c) 1997-2001 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Luke Mewburn.
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
/*
* Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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.
*/
/*
* Copyright (C) 1997 and 1998 WIDE Project.
* 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 project 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 PROJECT 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 PROJECT 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.
*/
#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT(
"@(#) Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994\n\
The Regents of the University of California. All rights reserved.\n");
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)ftpd.c 8.5 (Berkeley) 4/28/95";
#else
__RCSID("$NetBSD: ftpd.c,v 1.148 2002/12/06 01:59:22 thorpej Exp $");
#endif
#endif /* not lint */
/*
* FTP server.
*/
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <sys/mman.h>
#include <sys/resource.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#define FTP_NAMES
#include <arpa/ftp.h>
#include <arpa/inet.h>
#include <arpa/telnet.h>
#include <ctype.h>
#include <dirent.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <fnmatch.h>
#include <glob.h>
#include <grp.h>
#include <limits.h>
#include <netdb.h>
#include <pwd.h>
#include <setjmp.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <time.h>
#include <tzfile.h>
#include <unistd.h>
#include <util.h>
#ifdef SUPPORT_UTMP
#include <utmp.h>
#endif
#ifdef SUPPORT_UTMPX
#include <utmpx.h>
#endif
#ifdef SKEY
#include <skey.h>
#endif
#ifdef KERBEROS5
#include <com_err.h>
#include <krb5/krb5.h>
#endif
#define GLOBAL
#include "extern.h"
#include "pathnames.h"
#include "version.h"
int data;
jmp_buf urgcatch;
int sflag;
int stru; /* avoid C keyword */
int mode;
int dataport; /* use specific data port */
int dopidfile; /* maintain pid file */
int doutmp; /* update utmp file */
int dowtmp; /* update wtmp file */
int doxferlog; /* syslog wu-ftpd style xferlog entries */
int dropprivs; /* if privileges should or have been dropped */
int mapped; /* IPv4 connection on AF_INET6 socket */
off_t file_size;
off_t byte_count;
static char ttyline[20];
#ifdef SUPPORT_UTMP
static struct utmp utmp; /* for utmp */
#endif
#ifdef SUPPORT_UTMPX
static struct utmpx utmpx; /* for utmpx */
#endif
static const char *anondir = NULL;
static const char *confdir = _DEFAULT_CONFDIR;
#if defined(KERBEROS) || defined(KERBEROS5)
int has_ccache = 0;
int notickets = 1;
char *krbtkfile_env = NULL;
char *tty = ttyline;
int login_krb5_forwardable_tgt = 0;
#endif
int epsvall = 0;
/*
* Timeout intervals for retrying connections
* to hosts that don't accept PORT cmds. This
* is a kludge, but given the problems with TCP...
*/
#define SWAITMAX 90 /* wait at most 90 seconds */
#define SWAITINT 5 /* interval between retries */
int swaitmax = SWAITMAX;
int swaitint = SWAITINT;
enum send_status {
SS_SUCCESS,
SS_NO_TRANSFER, /* no transfer made yet */
SS_FILE_ERROR, /* file read error */
SS_DATA_ERROR /* data send error */
};
static int bind_pasv_addr(void);
static int checkuser(const char *, const char *, int, int, char **);
static int checkaccess(const char *);
static int checkpassword(const struct passwd *, const char *);
static void end_login(void);
static FILE *getdatasock(const char *);
static char *gunique(const char *);
static void login_utmp(const char *, const char *, const char *);
static void logremotehost(struct sockinet *);
static void lostconn(int);
static void myoob(int);
static int receive_data(FILE *, FILE *);
static int send_data(FILE *, FILE *, const struct stat *, int);
static struct passwd *sgetpwnam(const char *);
static int write_data(int, char *, size_t, off_t *, struct timeval *,
int);
static enum send_status
send_data_with_read(int, int, const struct stat *, int);
static enum send_status
send_data_with_mmap(int, int, const struct stat *, int);
static void logrusage(const struct rusage *, const struct rusage *);
static void logout_utmp(void);
int main(int, char *[]);
#if defined(KERBEROS)
int klogin(struct passwd *, char *, char *, char *);
void kdestroy(void);
#endif
#if defined(KERBEROS5)
int k5login(struct passwd *, char *, char *, char *);
void k5destroy(void);
#endif
int
main(int argc, char *argv[])
{
int addrlen, ch, on = 1, tos, keepalive;
#ifdef KERBEROS5
krb5_error_code kerror;
#endif
char *p;
long l;
connections = 1;
debug = 0;
logging = 0;
pdata = -1;
sflag = 0;
dataport = 0;
dopidfile = 1; /* default: DO use a pid file to count users */
doutmp = 0; /* default: Do NOT log to utmp */
dowtmp = 1; /* default: DO log to wtmp */
doxferlog = 0; /* default: Do NOT syslog xferlog */
dropprivs = 0;
mapped = 0;
usedefault = 1;
emailaddr = NULL;
hostname[0] = '\0';
homedir[0] = '\0';
gidcount = 0;
is_oob = 0;
version = FTPD_VERSION;
/*
* LOG_NDELAY sets up the logging connection immediately,
* necessary for anonymous ftp's that chroot and can't do it later.
*/
openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP);
while ((ch = getopt(argc, argv, "a:c:C:de:h:HlP:qQrst:T:uUvV:wWX"))
!= -1) {
switch (ch) {
case 'a':
anondir = optarg;
break;
case 'c':
confdir = optarg;
break;
case 'C':
pw = sgetpwnam(optarg);
exit(checkaccess(optarg) ? 0 : 1);
/* NOTREACHED */
case 'd':
case 'v': /* deprecated */
debug = 1;
break;
case 'e':
emailaddr = optarg;
break;
case 'h':
strlcpy(hostname, optarg, sizeof(hostname));
break;
case 'H':
if (gethostname(hostname, sizeof(hostname)) == -1)
hostname[0] = '\0';
hostname[sizeof(hostname) - 1] = '\0';
break;
case 'l':
logging++; /* > 1 == extra logging */
break;
case 'P':
errno = 0;
p = NULL;
l = strtol(optarg, &p, 10);
if (errno || *optarg == '\0' || *p != '\0' ||
l < IPPORT_RESERVED ||
l > IPPORT_ANONMAX) {
syslog(LOG_WARNING, "Invalid dataport %s",
optarg);
dataport = 0;
}
dataport = (int)l;
break;
case 'q':
dopidfile = 1;
break;
case 'Q':
dopidfile = 0;
break;
case 'r':
dropprivs = 1;
break;
case 's':
sflag = 1;
break;
case 't':
case 'T':
syslog(LOG_WARNING,
"-%c has been deprecated in favour of ftpd.conf",
ch);
break;
case 'u':
doutmp = 1;
break;
case 'U':
doutmp = 0;
break;
case 'V':
if (EMPTYSTR(optarg) || strcmp(optarg, "-") == 0)
version = NULL;
else
version = xstrdup(optarg);
break;
case 'w':
dowtmp = 1;
break;
case 'W':
dowtmp = 0;
break;
case 'X':
doxferlog = 1;
break;
default:
if (optopt == 'a' || optopt == 'C')
exit(1);
syslog(LOG_WARNING, "unknown flag -%c ignored", optopt);
break;
}
}
if (EMPTYSTR(confdir))
confdir = _DEFAULT_CONFDIR;
memset((char *)&his_addr, 0, sizeof(his_addr));
addrlen = sizeof(his_addr.si_su);
if (getpeername(0, (struct sockaddr *)&his_addr.si_su, &addrlen) < 0) {
syslog(LOG_ERR, "getpeername (%s): %m",argv[0]);
exit(1);
}
his_addr.su_len = addrlen;
memset((char *)&ctrl_addr, 0, sizeof(ctrl_addr));
addrlen = sizeof(ctrl_addr.si_su);
if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) {
syslog(LOG_ERR, "getsockname (%s): %m",argv[0]);
exit(1);
}
ctrl_addr.su_len = addrlen;
#ifdef INET6
if (his_addr.su_family == AF_INET6
&& IN6_IS_ADDR_V4MAPPED(&his_addr.su_6addr)) {
#if 1
/*
* IPv4 control connection arrived to AF_INET6 socket.
* I hate to do this, but this is the easiest solution.
*
* The assumption is untrue on SIIT environment.
*/
struct sockinet tmp_addr;
const int off = sizeof(struct in6_addr) - sizeof(struct in_addr);
tmp_addr = his_addr;
memset(&his_addr, 0, sizeof(his_addr));
his_addr.su_family = AF_INET;
his_addr.su_len = sizeof(his_addr.si_su.su_sin);
memcpy(&his_addr.su_addr, &tmp_addr.su_6addr.s6_addr[off],
sizeof(his_addr.su_addr));
his_addr.su_port = tmp_addr.su_port;
tmp_addr = ctrl_addr;
memset(&ctrl_addr, 0, sizeof(ctrl_addr));
ctrl_addr.su_family = AF_INET;
ctrl_addr.su_len = sizeof(ctrl_addr.si_su.su_sin);
memcpy(&ctrl_addr.su_addr, &tmp_addr.su_6addr.s6_addr[off],
sizeof(ctrl_addr.su_addr));
ctrl_addr.su_port = tmp_addr.su_port;
#else
while (fgets(line, sizeof(line), fd) != NULL) {
if ((cp = strchr(line, '\n')) != NULL)
*cp = '\0';
reply(-530, "%s", line);
}
(void) fflush(stdout);
(void) fclose(fd);
reply(530,
"Connection from IPv4 mapped address is not supported.");
exit(0);
#endif
mapped = 1;
} else
#endif /* INET6 */
mapped = 0;
#ifdef IP_TOS
if (!mapped && his_addr.su_family == AF_INET) {
tos = IPTOS_LOWDELAY;
if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos,
sizeof(int)) < 0)
syslog(LOG_WARNING, "setsockopt (IP_TOS): %m");
}
#endif
/* if the hostname hasn't been given, attempt to determine it */
if (hostname[0] == '\0') {
if (getnameinfo((struct sockaddr *)&ctrl_addr.si_su,
ctrl_addr.su_len, hostname, sizeof(hostname), NULL, 0, 0)
!= 0)
(void)gethostname(hostname, sizeof(hostname));
hostname[sizeof(hostname) - 1] = '\0';
}
/* set this here so klogin can use it... */
(void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid());
(void) freopen(_PATH_DEVNULL, "w", stderr);
(void) signal(SIGPIPE, lostconn);
(void) signal(SIGCHLD, SIG_IGN);
if (signal(SIGURG, myoob) == SIG_ERR)
syslog(LOG_WARNING, "signal: %m");
/* Try to handle urgent data inline */
#ifdef SO_OOBINLINE
if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0)
syslog(LOG_WARNING, "setsockopt: %m");
#endif
/* Set keepalives on the socket to detect dropped connections. */
#ifdef SO_KEEPALIVE
keepalive = 1;
if (setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, (char *)&keepalive,
sizeof(int)) < 0)
syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m");
#endif
#ifdef F_SETOWN
if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1)
syslog(LOG_WARNING, "fcntl F_SETOWN: %m");
#endif
logremotehost(&his_addr);
/*
* Set up default state
*/
data = -1;
type = TYPE_A;
form = FORM_N;
stru = STRU_F;
mode = MODE_S;
tmpline[0] = '\0';
hasyyerrored = 0;
#ifdef KERBEROS5
kerror = krb5_init_context(&kcontext);
if (kerror) {
syslog(LOG_ERR, "%s when initializing Kerberos context",
error_message(kerror));
exit(0);
}
#endif /* KERBEROS5 */
init_curclass();
curclass.timeout = 300; /* 5 minutes, as per login(1) */
curclass.type = CLASS_REAL;
/* If logins are disabled, print out the message. */
if (display_file(_PATH_NOLOGIN, 530)) {
reply(530, "System not available.");
exit(0);
}
(void)display_file(conffilename(_PATH_FTPWELCOME), 220);
/* reply(220,) must follow */
if (EMPTYSTR(version))
reply(220, "%s FTP server ready.", hostname);
else
reply(220, "%s FTP server (%s) ready.", hostname, version);
(void) setjmp(errcatch);
ftp_loop();
/* NOTREACHED */
}
static void
lostconn(int signo)
{
if (debug)
syslog(LOG_DEBUG, "lost connection");
dologout(1);
}
/*
* Save the result of a getpwnam. Used for USER command, since
* the data returned must not be clobbered by any other command
* (e.g., globbing).
*/
static struct passwd *
sgetpwnam(const char *name)
{
static struct passwd save;
struct passwd *p;
if ((p = getpwnam(name)) == NULL)
return (p);
if (save.pw_name) {
free((char *)save.pw_name);
memset(save.pw_passwd, 0, strlen(save.pw_passwd));
free((char *)save.pw_passwd);
free((char *)save.pw_gecos);
free((char *)save.pw_dir);
free((char *)save.pw_shell);
}
save = *p;
save.pw_name = xstrdup(p->pw_name);
save.pw_passwd = xstrdup(p->pw_passwd);
save.pw_gecos = xstrdup(p->pw_gecos);
save.pw_dir = xstrdup(p->pw_dir);
save.pw_shell = xstrdup(p->pw_shell);
return (&save);
}
static int login_attempts; /* number of failed login attempts */
static int askpasswd; /* had USER command, ask for PASSwd */
static int permitted; /* USER permitted */
static char curname[LOGIN_NAME_MAX]; /* current USER name */
/*
* USER command.
* Sets global passwd pointer pw if named account exists and is acceptable;
* sets askpasswd if a PASS command is expected. If logged in previously,
* need to reset state. If name is "ftp" or "anonymous", the name is not in
* _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return.
* If account doesn't exist, ask for passwd anyway. Otherwise, check user
* requesting login privileges. Disallow anyone who does not have a standard
* shell as returned by getusershell(). Disallow anyone mentioned in the file
* _PATH_FTPUSERS to allow people such as root and uucp to be avoided.
*/
void
user(const char *name)
{
char *class;
class = NULL;
if (logged_in) {
switch (curclass.type) {
case CLASS_GUEST:
reply(530, "Can't change user from guest login.");
return;
case CLASS_CHROOT:
reply(530, "Can't change user from chroot user.");
return;
case CLASS_REAL:
if (dropprivs) {
reply(530, "Can't change user.");
return;
}
end_login();
break;
default:
abort();
}
}
#if defined(KERBEROS)
kdestroy();
#endif
#if defined(KERBEROS5)
k5destroy();
#endif
curclass.type = CLASS_REAL;
askpasswd = 0;
permitted = 0;
if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) {
/* need `pw' setup for checkaccess() and checkuser () */
if ((pw = sgetpwnam("ftp")) == NULL)
reply(530, "User %s unknown.", name);
else if (! checkaccess("ftp") || ! checkaccess("anonymous"))
reply(530, "User %s access denied.", name);
else {
curclass.type = CLASS_GUEST;
askpasswd = 1;
reply(331,
"Guest login ok, type your name as password.");
}
if (!askpasswd) {
if (logging)
syslog(LOG_NOTICE,
"ANONYMOUS FTP LOGIN REFUSED FROM %s",
remotehost);
end_login();
goto cleanup_user;
}
name = "ftp";
} else
pw = sgetpwnam(name);
if (logging)
strlcpy(curname, name, sizeof(curname));
/* check user in /etc/ftpusers, and setup class */
permitted = checkuser(_PATH_FTPUSERS, curname, 1, 0, &class);
/* check user in /etc/ftpchroot */
if (checkuser(_PATH_FTPCHROOT, curname, 0, 0, NULL)) {
if (curclass.type == CLASS_GUEST) {
syslog(LOG_NOTICE,
"Can't change guest user to chroot class; remove entry in %s",
_PATH_FTPCHROOT);
exit(1);
}
curclass.type = CLASS_CHROOT;
}
/* determine default class */
if (class == NULL) {
switch (curclass.type) {
case CLASS_GUEST:
class = xstrdup("guest");
break;
case CLASS_CHROOT:
class = xstrdup("chroot");
break;
case CLASS_REAL:
class = xstrdup("real");
break;
default:
syslog(LOG_ERR, "unknown curclass.type %d; aborting",
curclass.type);
abort();
}
}
/* parse ftpd.conf, setting up various parameters */
parse_conf(class);
/* if not guest user, check for valid shell */
if (pw == NULL)
permitted = 0;
else {
const char *cp, *shell;
if ((shell = pw->pw_shell) == NULL || *shell == 0)
shell = _PATH_BSHELL;
while ((cp = getusershell()) != NULL)
if (strcmp(cp, shell) == 0)
break;
endusershell();
if (cp == NULL && curclass.type != CLASS_GUEST)
permitted = 0;
}
/* deny quickly (after USER not PASS) if requested */
if (CURCLASS_FLAGS_ISSET(denyquick) && !permitted) {
reply(530, "User %s may not use FTP.", curname);
if (logging)
syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s",
remotehost, curname);
end_login();
goto cleanup_user;
}
/* if haven't asked yet (i.e, not anon), ask now */
if (!askpasswd) {
askpasswd = 1;
#ifdef SKEY
if (skey_haskey(curname) == 0) {
const char *myskey;
myskey = skey_keyinfo(curname);
reply(331, "Password [ %s ] required for %s.",
myskey ? myskey : "error getting challenge",
curname);
} else
#endif
reply(331, "Password required for %s.", curname);
}
cleanup_user:
/*
* Delay before reading passwd after first failed
* attempt to slow down passwd-guessing programs.
*/
if (login_attempts)
sleep((unsigned) login_attempts);
if (class)
free(class);
}
/*
* Determine whether something is to happen (allow access, chroot)
* for a user. Each line is a shell-style glob followed by
* `yes' or `no'.
*
* For backward compatibility, `allow' and `deny' are synonymns
* for `yes' and `no', respectively.
*
* Each glob is matched against the username in turn, and the first
* match found is used. If no match is found, the result is the
* argument `def'. If a match is found but without and explicit
* `yes'/`no', the result is the opposite of def.
*
* If the file doesn't exist at all, the result is the argument
* `nofile'
*
* Any line starting with `#' is considered a comment and ignored.
*
* Returns 0 if the user is denied, or 1 if they are allowed.
*
* NOTE: needs struct passwd *pw setup before use.
*/
static int
checkuser(const char *fname, const char *name, int def, int nofile,
char **retclass)
{
FILE *fd;
int retval;
char *word, *perm, *class, *buf, *p;
size_t len, line;
retval = def;
if (retclass != NULL)
*retclass = NULL;
if ((fd = fopen(conffilename(fname), "r")) == NULL)
return nofile;
line = 0;
for (;
(buf = fparseln(fd, &len, &line, NULL, FPARSELN_UNESCCOMM |
FPARSELN_UNESCCONT | FPARSELN_UNESCESC)) != NULL;
free(buf), buf = NULL) {
word = perm = class = NULL;
p = buf;
if (len < 1)
continue;
if (p[len - 1] == '\n')
p[--len] = '\0';
if (EMPTYSTR(p))
continue;
NEXTWORD(p, word);
NEXTWORD(p, perm);
NEXTWORD(p, class);
if (EMPTYSTR(word))
continue;
if (!EMPTYSTR(class)) {
if (strcasecmp(class, "all") == 0 ||
strcasecmp(class, "none") == 0) {
syslog(LOG_WARNING,
"%s line %d: illegal user-defined class `%s' - skipping entry",
fname, (int)line, class);
continue;
}
}
/* have a host specifier */
if ((p = strchr(word, '@')) != NULL) {
unsigned long net, mask, addr;
int bits;
*p++ = '\0';
/* check against network or CIDR */
if (isdigit(*p) &&
(bits = inet_net_pton(AF_INET, p,
&net, sizeof(net))) != -1) {
net = ntohl(net);
mask = 0xffffffffU << (32 - bits);
addr = ntohl(his_addr.su_addr.s_addr);
if ((addr & mask) != net)
continue;
/* check against hostname glob */
} else if (fnmatch(p, remotehost, FNM_CASEFOLD) != 0)
continue;
}
/* have a group specifier */
if ((p = strchr(word, ':')) != NULL) {
gid_t *groups, *ng;
int gsize, i, found;
if (pw == NULL)
continue; /* no match for unknown user */
*p++ = '\0';
groups = NULL;
gsize = 16;
do {
ng = realloc(groups, gsize * sizeof(gid_t));
if (ng == NULL)
fatal(
"Local resource failure: realloc");
groups = ng;
} while (getgrouplist(pw->pw_name, pw->pw_gid,
groups, &gsize) == -1);
found = 0;
for (i = 0; i < gsize; i++) {
struct group *g;
if ((g = getgrgid(groups[i])) == NULL)
continue;
if (fnmatch(p, g->gr_name, 0) == 0) {
found = 1;
break;
}
}
free(groups);
if (!found)
continue;
}
/* check against username glob */
if (fnmatch(word, name, 0) != 0)
continue;
if (perm != NULL &&
((strcasecmp(perm, "allow") == 0) ||
(strcasecmp(perm, "yes") == 0)))
retval = 1;
else if (perm != NULL &&
((strcasecmp(perm, "deny") == 0) ||
(strcasecmp(perm, "no") == 0)))
retval = 0;
else
retval = !def;
if (!EMPTYSTR(class) && retclass != NULL)
*retclass = xstrdup(class);
free(buf);
break;
}
(void) fclose(fd);
return (retval);
}
/*
* Check if user is allowed by /etc/ftpusers
* returns 1 for yes, 0 for no
*
* NOTE: needs struct passwd *pw setup (for checkuser())
*/
static int
checkaccess(const char *name)
{
return (checkuser(_PATH_FTPUSERS, name, 1, 0, NULL));
}
static void
login_utmp(const char *line, const char *name, const char *host)
{
#if defined(SUPPORT_UTMPX) || defined(SUPPORT_UTMP)
struct timeval tv;
(void)gettimeofday(&tv, NULL);
#endif
#ifdef SUPPORT_UTMPX
if (doutmp) {
(void)memset(&utmpx, 0, sizeof(utmpx));
utmpx.ut_tv = tv;
utmpx.ut_pid = getpid();
utmpx.ut_id[0] = 'f';
utmpx.ut_id[1] = 't';
utmpx.ut_id[2] = 'p';
utmpx.ut_id[3] = '*';
utmpx.ut_type = USER_PROCESS;
(void)strncpy(utmpx.ut_name, name, sizeof(utmpx.ut_name));
(void)strncpy(utmpx.ut_line, line, sizeof(utmpx.ut_line));
(void)strncpy(utmpx.ut_host, host, sizeof(utmpx.ut_host));
loginx(&utmpx);
}
if (dowtmp)
logwtmpx(line, name, host, 0, USER_PROCESS);
#endif
#ifdef SUPPORT_UTMP
if (doutmp) {
(void)memset(&utmp, 0, sizeof(utmp));
(void)time(&utmp.ut_time);
(void)strncpy(utmp.ut_name, name, sizeof(utmp.ut_name));
(void)strncpy(utmp.ut_line, line, sizeof(utmp.ut_line));
(void)strncpy(utmp.ut_host, host, sizeof(utmp.ut_host));
login(&utmp);
}
if (dowtmp)
logwtmp(line, name, host);
#endif
}
static void
logout_utmp(void)
{
int okwtmp = dowtmp;
if (logged_in) {
if (doutmp) {
#ifdef SUPPORT_UTMPX
okwtmp = logoutx(ttyline, 0, DEAD_PROCESS) & dowtmp;
#endif
#ifdef SUPPORT_UTMP
okwtmp = logout(ttyline) & dowtmp;
#endif
}
if (okwtmp) {
#ifdef SUPPORT_UTMPX
logwtmpx(ttyline, "", "", 0, DEAD_PROCESS);
#endif
#ifdef SUPPORT_UTMP
logwtmp(ttyline, "", "");
#endif
}
}
}
/*
* Terminate login as previous user (if any), resetting state;
* used when USER command is given or login fails.
*/
static void
end_login(void)
{
logout_utmp();
show_chdir_messages(-1); /* flush chdir cache */
if (pw != NULL && pw->pw_passwd != NULL)
memset(pw->pw_passwd, 0, strlen(pw->pw_passwd));
pw = NULL;
logged_in = 0;
askpasswd = 0;
permitted = 0;
quietmessages = 0;
gidcount = 0;
curclass.type = CLASS_REAL;
(void) seteuid((uid_t)0);
}
void
pass(const char *passwd)
{
int rval;
char root[MAXPATHLEN];
if (logged_in || askpasswd == 0) {
reply(503, "Login with USER first.");
return;
}
askpasswd = 0;
if (curclass.type != CLASS_GUEST) {
/* "ftp" is the only account allowed with no password */
if (pw == NULL) {
rval = 1; /* failure below */
goto skip;
}
#if defined(KERBEROS)
if (klogin(pw, "", hostname, (char *)passwd) == 0) {
rval = 0;
goto skip;
}
#endif
#if defined(KERBEROS5)
if (k5login(pw, "", hostname, (char *)passwd) == 0) {
rval = 0;
goto skip;
}
#endif
#ifdef SKEY
if (skey_haskey(pw->pw_name) == 0) {
char *p;
int r;
p = xstrdup(passwd);
r = skey_passcheck(pw->pw_name, p);
free(p);
if (r != -1) {
rval = 0;
goto skip;
}
}
#endif
if (!sflag)
rval = checkpassword(pw, passwd);
else
rval = 1;
skip:
/*
* If rval > 0, the user failed the authentication check
* above. If rval == 0, either Kerberos or local
* authentication succeeded.
*/
if (rval) {
reply(530, "%s", rval == 2 ? "Password expired." :
"Login incorrect.");
if (logging) {
syslog(LOG_NOTICE,
"FTP LOGIN FAILED FROM %s", remotehost);
syslog(LOG_AUTHPRIV | LOG_NOTICE,
"FTP LOGIN FAILED FROM %s, %s",
remotehost, curname);
}
pw = NULL;
if (login_attempts++ >= 5) {
syslog(LOG_NOTICE,
"repeated login failures from %s",
remotehost);
exit(0);
}
return;
}
}
/* password ok; check if anything else prevents login */
if (! permitted) {
reply(530, "User %s may not use FTP.", pw->pw_name);
if (logging)
syslog(LOG_NOTICE, "FTP LOGIN REFUSED FROM %s, %s",
remotehost, pw->pw_name);
goto bad;
}
login_attempts = 0; /* this time successful */
if (setegid((gid_t)pw->pw_gid) < 0) {
reply(550, "Can't set gid.");
goto bad;
}
(void) initgroups(pw->pw_name, pw->pw_gid);
/* cache groups for cmds.c::matchgroup() */
gidcount = getgroups(sizeof(gidlist), gidlist);
/* open utmp/wtmp before chroot */
login_utmp(ttyline, pw->pw_name, remotehost);
logged_in = 1;
connections = 1;
if (dopidfile)
count_users();
if (curclass.limit != -1 && connections > curclass.limit) {
if (! EMPTYSTR(curclass.limitfile))
(void)display_file(conffilename(curclass.limitfile),
530);
reply(530,
"User %s access denied, connection limit of " LLF
" reached.",
pw->pw_name, (LLT)curclass.limit);
syslog(LOG_NOTICE,
"Maximum connection limit of " LLF
" for class %s reached, login refused for %s",
(LLT)curclass.limit, curclass.classname, pw->pw_name);
goto bad;
}
homedir[0] = '/';
switch (curclass.type) {
case CLASS_GUEST:
/*
* We MUST do a chdir() after the chroot. Otherwise
* the old current directory will be accessible as "."
* outside the new root!
*/
format_path(root,
curclass.chroot ? curclass.chroot :
anondir ? anondir :
pw->pw_dir);
format_path(homedir,
curclass.homedir ? curclass.homedir :
"/");
if (EMPTYSTR(homedir))
homedir[0] = '/';
if (EMPTYSTR(root) || chroot(root) < 0) {
syslog(LOG_NOTICE,
"GUEST user %s: can't chroot to %s: %m",
pw->pw_name, root);
goto bad_guest;
}
if (chdir(homedir) < 0) {
syslog(LOG_NOTICE,
"GUEST user %s: can't chdir to %s: %m",
pw->pw_name, homedir);
bad_guest:
reply(550, "Can't set guest privileges.");
goto bad;
}
break;
case CLASS_CHROOT:
format_path(root,
curclass.chroot ? curclass.chroot :
pw->pw_dir);
format_path(homedir,
curclass.homedir ? curclass.homedir :
"/");
if (EMPTYSTR(homedir))
homedir[0] = '/';
if (EMPTYSTR(root) || chroot(root) < 0) {
syslog(LOG_NOTICE,
"CHROOT user %s: can't chroot to %s: %m",
pw->pw_name, root);
goto bad_chroot;
}
if (chdir(homedir) < 0) {
syslog(LOG_NOTICE,
"CHROOT user %s: can't chdir to %s: %m",
pw->pw_name, homedir);
bad_chroot:
reply(550, "Can't change root.");
goto bad;
}
break;
case CLASS_REAL:
/* only chroot REAL if explictly requested */
if (! EMPTYSTR(curclass.chroot)) {
format_path(root, curclass.chroot);
if (EMPTYSTR(root) || chroot(root) < 0) {
syslog(LOG_NOTICE,
"REAL user %s: can't chroot to %s: %m",
pw->pw_name, root);
goto bad_chroot;
}
}
format_path(homedir,
curclass.homedir ? curclass.homedir :
pw->pw_dir);
if (EMPTYSTR(homedir) || chdir(homedir) < 0) {
if (chdir("/") < 0) {
syslog(LOG_NOTICE,
"REAL user %s: can't chdir to %s: %m",
pw->pw_name,
!EMPTYSTR(homedir) ? homedir : "/");
reply(530,
"User %s: can't change directory to %s.",
pw->pw_name,
!EMPTYSTR(homedir) ? homedir : "/");
goto bad;
} else {
reply(-230,
"No directory! Logging in with home=/");
homedir[0] = '/';
}
}
break;
}
setlogin(pw->pw_name);
if (dropprivs ||
(curclass.type != CLASS_REAL &&
ntohs(ctrl_addr.su_port) > IPPORT_RESERVED + 1)) {
dropprivs++;
if (setgid((gid_t)pw->pw_gid) < 0) {
reply(550, "Can't set gid.");
goto bad;
}
if (setuid((uid_t)pw->pw_uid) < 0) {
reply(550, "Can't set uid.");
goto bad;
}
} else {
if (seteuid((uid_t)pw->pw_uid) < 0) {
reply(550, "Can't set uid.");
goto bad;
}
}
setenv("HOME", homedir, 1);
if (curclass.type == CLASS_GUEST && passwd[0] == '-')
quietmessages = 1;
/*
* Display a login message, if it exists.
* N.B. reply(230,) must follow the message.
*/
if (! EMPTYSTR(curclass.motd))
(void)display_file(conffilename(curclass.motd), 230);
show_chdir_messages(230);
if (curclass.type == CLASS_GUEST) {
char *p;
reply(230, "Guest login ok, access restrictions apply.");
#if HAVE_SETPROCTITLE
snprintf(proctitle, sizeof(proctitle),
"%s: anonymous/%s", remotehost, passwd);
setproctitle("%s", proctitle);
#endif /* HAVE_SETPROCTITLE */
if (logging)
syslog(LOG_INFO,
"ANONYMOUS FTP LOGIN FROM %s, %s (class: %s, type: %s)",
remotehost, passwd,
curclass.classname, CURCLASSTYPE);
/* store guest password reply into pw_passwd */
REASSIGN(pw->pw_passwd, xstrdup(passwd));
for (p = pw->pw_passwd; *p; p++)
if (!isgraph(*p))
*p = '_';
} else {
reply(230, "User %s logged in.", pw->pw_name);
#if HAVE_SETPROCTITLE
snprintf(proctitle, sizeof(proctitle),
"%s: %s", remotehost, pw->pw_name);
setproctitle("%s", proctitle);
#endif /* HAVE_SETPROCTITLE */
if (logging)
syslog(LOG_INFO,
"FTP LOGIN FROM %s as %s (class: %s, type: %s)",
remotehost, pw->pw_name,
curclass.classname, CURCLASSTYPE);
}
(void) umask(curclass.umask);
return;
bad:
/* Forget all about it... */
end_login();
}
void
retrieve(char *argv[], const char *name)
{
FILE *fin, *dout;
struct stat st;
int (*closefunc)(FILE *) = NULL;
int dolog, sendrv, closerv, stderrfd, isconversion, isdata, isls;
struct timeval start, finish, td, *tdp;
struct rusage rusage_before, rusage_after;
const char *dispname;
char *error;
sendrv = closerv = stderrfd = -1;
isconversion = isdata = isls = dolog = 0;
tdp = NULL;
dispname = name;
fin = dout = NULL;
error = NULL;
if (argv == NULL) { /* if not running a command ... */
dolog = 1;
isdata = 1;
fin = fopen(name, "r");
closefunc = fclose;
if (fin == NULL) /* doesn't exist?; try a conversion */
argv = do_conversion(name);
if (argv != NULL) {
isconversion++;
syslog(LOG_DEBUG, "get command: '%s' on '%s'",
argv[0], name);
}
}
if (argv != NULL) {
char temp[MAXPATHLEN];
if (strcmp(argv[0], INTERNAL_LS) == 0) {
isls = 1;
stderrfd = -1;
} else {
(void)snprintf(temp, sizeof(temp), "%s", TMPFILE);
stderrfd = mkstemp(temp);
if (stderrfd != -1)
(void)unlink(temp);
}
dispname = argv[0];
fin = ftpd_popen(argv, "r", stderrfd);
closefunc = ftpd_pclose;
st.st_size = -1;
st.st_blksize = BUFSIZ;
}
if (fin == NULL) {
if (errno != 0) {
perror_reply(550, dispname);
if (dolog)
logxfer("get", -1, name, NULL, NULL,
strerror(errno));
}
goto cleanupretrieve;
}
byte_count = -1;
if (argv == NULL
&& (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) {
error = "Not a plain file";
reply(550, "%s: %s.", dispname, error);
goto done;
}
if (restart_point) {
if (type == TYPE_A) {
off_t i;
int c;
for (i = 0; i < restart_point; i++) {
if ((c=getc(fin)) == EOF) {
error = strerror(errno);
perror_reply(550, dispname);
goto done;
}
if (c == '\n')
i++;
}
} else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) {
error = strerror(errno);
perror_reply(550, dispname);
goto done;
}
}
dout = dataconn(dispname, st.st_size, "w");
if (dout == NULL)
goto done;
(void)getrusage(RUSAGE_SELF, &rusage_before);
(void)gettimeofday(&start, NULL);
sendrv = send_data(fin, dout, &st, isdata);
(void)gettimeofday(&finish, NULL);
(void)getrusage(RUSAGE_SELF, &rusage_after);
closedataconn(dout); /* close now to affect timing stats */
timersub(&finish, &start, &td);
tdp = &td;
done:
if (dolog) {
logxfer("get", byte_count, name, NULL, tdp, error);
if (tdp != NULL)
logrusage(&rusage_before, &rusage_after);
}
closerv = (*closefunc)(fin);
if (sendrv == 0) {
FILE *errf;
struct stat sb;
if (!isls && argv != NULL && closerv != 0) {
reply(-226,
"Command returned an exit status of %d",
closerv);
if (isconversion)
syslog(LOG_WARNING,
"retrieve command: '%s' returned %d",
argv[0], closerv);
}
if (!isls && argv != NULL && stderrfd != -1 &&
(fstat(stderrfd, &sb) == 0) && sb.st_size > 0 &&
((errf = fdopen(stderrfd, "r")) != NULL)) {
char *cp, line[LINE_MAX];
reply(-226, "Command error messages:");
rewind(errf);
while (fgets(line, sizeof(line), errf) != NULL) {
if ((cp = strchr(line, '\n')) != NULL)
*cp = '\0';
reply(0, " %s", line);
}
(void) fflush(stdout);
(void) fclose(errf);
/* a reply(226,) must follow */
}
reply(226, "Transfer complete.");
}
cleanupretrieve:
if (stderrfd != -1)
(void)close(stderrfd);
if (isconversion)
free(argv);
}
void
store(const char *name, const char *fmode, int unique)
{
FILE *fout, *din;
struct stat st;
int (*closefunc)(FILE *);
struct timeval start, finish, td, *tdp;
char *desc, *error;
din = NULL;
desc = (*fmode == 'w') ? "put" : "append";
error = NULL;
if (unique && stat(name, &st) == 0 &&
(name = gunique(name)) == NULL) {
logxfer(desc, -1, name, NULL, NULL,
"cannot create unique file");
goto cleanupstore;
}
if (restart_point)
fmode = "r+";
fout = fopen(name, fmode);
closefunc = fclose;
tdp = NULL;
if (fout == NULL) {
perror_reply(553, name);
logxfer(desc, -1, name, NULL, NULL, strerror(errno));
goto cleanupstore;
}
byte_count = -1;
if (restart_point) {
if (type == TYPE_A) {
off_t i;
int c;
for (i = 0; i < restart_point; i++) {
if ((c=getc(fout)) == EOF) {
error = strerror(errno);
perror_reply(550, name);
goto done;
}
if (c == '\n')
i++;
}
/*
* We must do this seek to "current" position
* because we are changing from reading to
* writing.
*/
if (fseek(fout, 0L, SEEK_CUR) < 0) {
error = strerror(errno);
perror_reply(550, name);
goto done;
}
} else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) {
error = strerror(errno);
perror_reply(550, name);
goto done;
}
}
din = dataconn(name, (off_t)-1, "r");
if (din == NULL)
goto done;
(void)gettimeofday(&start, NULL);
if (receive_data(din, fout) == 0) {
if (unique)
reply(226, "Transfer complete (unique file name:%s).",
name);
else
reply(226, "Transfer complete.");
}
(void)gettimeofday(&finish, NULL);
closedataconn(din); /* close now to affect timing stats */
timersub(&finish, &start, &td);
tdp = &td;
done:
logxfer(desc, byte_count, name, NULL, tdp, error);
(*closefunc)(fout);
cleanupstore:
;
}
static FILE *
getdatasock(const char *fmode)
{
int on, s, t, tries;
in_port_t port;
on = 1;
if (data >= 0)
return (fdopen(data, fmode));
if (! dropprivs)
(void) seteuid((uid_t)0);
s = socket(ctrl_addr.su_family, SOCK_STREAM, 0);
if (s < 0)
goto bad;
if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
(char *) &on, sizeof(on)) < 0)
goto bad;
if (setsockopt(s, SOL_SOCKET, SO_KEEPALIVE,
(char *) &on, sizeof(on)) < 0)
goto bad;
/* anchor socket to avoid multi-homing problems */
data_source = ctrl_addr;
/*
* By default source port for PORT connctions is
* ctrlport-1 (see RFC959 section 5.2).
* However, if privs have been dropped and that
* would be < IPPORT_RESERVED, use a random port
* instead.
*/
if (dataport)
port = dataport;
else
port = ntohs(ctrl_addr.su_port) - 1;
if (dropprivs && port < IPPORT_RESERVED)
port = 0; /* use random port */
data_source.su_port = htons(port);
for (tries = 1; ; tries++) {
if (bind(s, (struct sockaddr *)&data_source.si_su,
data_source.su_len) >= 0)
break;
if (errno != EADDRINUSE || tries > 10)
goto bad;
sleep(tries);
}
if (! dropprivs)
(void) seteuid((uid_t)pw->pw_uid);
#ifdef IP_TOS
if (!mapped && ctrl_addr.su_family == AF_INET) {
on = IPTOS_THROUGHPUT;
if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on,
sizeof(int)) < 0)
syslog(LOG_WARNING, "setsockopt (IP_TOS): %m");
}
#endif
return (fdopen(s, fmode));
bad:
/* Return the real value of errno (close may change it) */
t = errno;
if (! dropprivs)
(void) seteuid((uid_t)pw->pw_uid);
(void) close(s);
errno = t;
return (NULL);
}
FILE *
dataconn(const char *name, off_t size, const char *fmode)
{
char sizebuf[32];
FILE *file;
int retry = 0, tos, keepalive;
file_size = size;
byte_count = 0;
if (size != (off_t) -1)
(void)snprintf(sizebuf, sizeof(sizebuf), " (" LLF " byte%s)",
(LLT)size, PLURAL(size));
else
sizebuf[0] = '\0';
if (pdata >= 0) {
struct sockinet from;
int s, fromlen = sizeof(from.su_len);
(void) alarm(curclass.timeout);
s = accept(pdata, (struct sockaddr *)&from.si_su, &fromlen);
(void) alarm(0);
if (s < 0) {
reply(425, "Can't open data connection.");
(void) close(pdata);
pdata = -1;
return (NULL);
}
(void) close(pdata);
pdata = s;
switch (from.su_family) {
case AF_INET:
#ifdef IP_TOS
if (!mapped) {
tos = IPTOS_THROUGHPUT;
(void) setsockopt(s, IPPROTO_IP, IP_TOS,
(char *)&tos, sizeof(int));
}
break;
#endif
}
/* Set keepalives on the socket to detect dropped conns. */
#ifdef SO_KEEPALIVE
keepalive = 1;
(void) setsockopt(s, SOL_SOCKET, SO_KEEPALIVE,
(char *)&keepalive, sizeof(int));
#endif
reply(150, "Opening %s mode data connection for '%s'%s.",
type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf);
return (fdopen(pdata, fmode));
}
if (data >= 0) {
reply(125, "Using existing data connection for '%s'%s.",
name, sizebuf);
usedefault = 1;
return (fdopen(data, fmode));
}
if (usedefault)
data_dest = his_addr;
usedefault = 1;
file = getdatasock(fmode);
if (file == NULL) {
char hbuf[NI_MAXHOST];
char pbuf[NI_MAXSERV];
if (getnameinfo((struct sockaddr *)&data_source.si_su,
data_source.su_len, hbuf, sizeof(hbuf), pbuf, sizeof(pbuf),
NI_NUMERICHOST | NI_NUMERICSERV))
strlcpy(hbuf, "?", sizeof(hbuf));
reply(425, "Can't create data socket (%s,%s): %s.",
hbuf, pbuf, strerror(errno));
return (NULL);
}
data = fileno(file);
while (connect(data, (struct sockaddr *)&data_dest.si_su,
data_dest.su_len) < 0) {
if (errno == EADDRINUSE && retry < swaitmax) {
sleep((unsigned) swaitint);
retry += swaitint;
continue;
}
perror_reply(425, "Can't build data connection");
(void) fclose(file);
data = -1;
return (NULL);
}
reply(150, "Opening %s mode data connection for '%s'%s.",
type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf);
return (file);
}
void
closedataconn(FILE *fd)
{
if (fd == NULL)
return;
(void)fclose(fd);
data = -1;
if (pdata >= 0)
(void)close(pdata);
pdata = -1;
}
int
write_data(int fd, char *buf, size_t size, off_t *bufrem,
struct timeval *then, int isdata)
{
struct timeval now, td;
ssize_t c;
while (size > 0) {
c = size;
if (curclass.writesize) {
if (curclass.writesize < c)
c = curclass.writesize;
}
if (curclass.rateget) {
if (*bufrem < c)
c = *bufrem;
}
(void) alarm(curclass.timeout);
c = write(fd, buf, c);
if (c <= 0)
return (1);
buf += c;
size -= c;
byte_count += c;
if (isdata) {
total_data_out += c;
total_data += c;
}
total_bytes_out += c;
total_bytes += c;
if (curclass.rateget) {
*bufrem -= c;
if (*bufrem == 0) {
(void)gettimeofday(&now, NULL);
timersub(&now, then, &td);
if (td.tv_sec == 0) {
usleep(1000000 - td.tv_usec);
(void)gettimeofday(then, NULL);
} else
*then = now;
*bufrem = curclass.rateget;
}
}
}
return (0);
}
static enum send_status
send_data_with_read(int filefd, int netfd, const struct stat *st, int isdata)
{
struct timeval then;
off_t bufrem;
size_t readsize;
char *buf;
int c, error;
if (curclass.readsize)
readsize = curclass.readsize;
else
readsize = (size_t)st->st_blksize;
if ((buf = malloc(readsize)) == NULL) {
perror_reply(451, "Local resource failure: malloc");
return (SS_NO_TRANSFER);
}
if (curclass.rateget) {
bufrem = curclass.rateget;
(void)gettimeofday(&then, NULL);
}
while (1) {
(void) alarm(curclass.timeout);
c = read(filefd, buf, readsize);
if (c == 0)
error = SS_SUCCESS;
else if (c < 0)
error = SS_FILE_ERROR;
else if (write_data(netfd, buf, c, &bufrem, &then, isdata))
error = SS_DATA_ERROR;
else
continue;
free(buf);
return (error);
}
}
static enum send_status
send_data_with_mmap(int filefd, int netfd, const struct stat *st, int isdata)
{
struct timeval then;
off_t bufrem, filesize, off, origoff;
size_t mapsize, winsize;
int error, sendbufsize, sendlowat;
void *win;
if (curclass.sendbufsize) {
sendbufsize = curclass.sendbufsize;
if (setsockopt(netfd, SOL_SOCKET, SO_SNDBUF,
&sendbufsize, sizeof(int)) == -1)
syslog(LOG_WARNING, "setsockopt(SO_SNDBUF, %d): %m",
sendbufsize);
}
if (curclass.sendlowat) {
sendlowat = curclass.sendlowat;
if (setsockopt(netfd, SOL_SOCKET, SO_SNDLOWAT,
&sendlowat, sizeof(int)) == -1)
syslog(LOG_WARNING, "setsockopt(SO_SNDLOWAT, %d): %m",
sendlowat);
}
winsize = curclass.mmapsize;
filesize = st->st_size;
if (debug)
syslog(LOG_INFO, "mmapsize = %ld, writesize = %ld",
(long)winsize, (long)curclass.writesize);
if (winsize == 0)
goto try_read;
off = lseek(filefd, (off_t)0, SEEK_CUR);
if (off == -1)
goto try_read;
origoff = off;
if (curclass.rateget) {
bufrem = curclass.rateget;
(void)gettimeofday(&then, NULL);
}
while (1) {
mapsize = MIN(filesize - off, winsize);
if (mapsize == 0)
break;
win = mmap(NULL, mapsize, PROT_READ,
MAP_FILE|MAP_SHARED, filefd, off);
if (win == MAP_FAILED) {
if (off == origoff)
goto try_read;
return (SS_FILE_ERROR);
}
(void) madvise(win, mapsize, MADV_SEQUENTIAL);
error = write_data(netfd, win, mapsize, &bufrem, &then,
isdata);
(void) madvise(win, mapsize, MADV_DONTNEED);
munmap(win, mapsize);
if (error)
return (SS_DATA_ERROR);
off += mapsize;
}
return (SS_SUCCESS);
try_read:
return (send_data_with_read(filefd, netfd, st, isdata));
}
/*
* Tranfer the contents of "instr" to "outstr" peer using the appropriate
* encapsulation of the data subject to Mode, Structure, and Type.
*
* NB: Form isn't handled.
*/
static int
send_data(FILE *instr, FILE *outstr, const struct stat *st, int isdata)
{
int c, filefd, netfd, rval;
transflag = 1;
rval = -1;
if (setjmp(urgcatch))
goto cleanup_send_data;
switch (type) {
case TYPE_A:
/* XXXLUKEM: rate limit ascii send (get) */
(void) alarm(curclass.timeout);
while ((c = getc(instr)) != EOF) {
byte_count++;
if (c == '\n') {
if (ferror(outstr))
goto data_err;
(void) putc('\r', outstr);
if (isdata) {
total_data_out++;
total_data++;
}
total_bytes_out++;
total_bytes++;
}
(void) putc(c, outstr);
if (isdata) {
total_data_out++;
total_data++;
}
total_bytes_out++;
total_bytes++;
if ((byte_count % 4096) == 0)
(void) alarm(curclass.timeout);
}
(void) alarm(0);
fflush(outstr);
if (ferror(instr))
goto file_err;
if (ferror(outstr))
goto data_err;
rval = 0;
goto cleanup_send_data;
case TYPE_I:
case TYPE_L:
filefd = fileno(instr);
netfd = fileno(outstr);
switch (send_data_with_mmap(filefd, netfd, st, isdata)) {
case SS_SUCCESS:
break;
case SS_NO_TRANSFER:
goto cleanup_send_data;
case SS_FILE_ERROR:
goto file_err;
case SS_DATA_ERROR:
goto data_err;
}
rval = 0;
goto cleanup_send_data;
default:
reply(550, "Unimplemented TYPE %d in send_data", type);
goto cleanup_send_data;
}
data_err:
(void) alarm(0);
perror_reply(426, "Data connection");
goto cleanup_send_data;
file_err:
(void) alarm(0);
perror_reply(551, "Error on input file");
/* FALLTHROUGH */
cleanup_send_data:
(void) alarm(0);
transflag = 0;
if (isdata) {
total_files_out++;
total_files++;
}
total_xfers_out++;
total_xfers++;
return (rval);
}
/*
* Transfer data from peer to "outstr" using the appropriate encapulation of
* the data subject to Mode, Structure, and Type.
*
* N.B.: Form isn't handled.
*/
static int
receive_data(FILE *instr, FILE *outstr)
{
int c, bare_lfs, netfd, filefd, rval;
off_t byteswritten;
char buf[BUFSIZ];
#ifdef __GNUC__
(void) &bare_lfs;
#endif
bare_lfs = 0;
transflag = 1;
rval = -1;
byteswritten = 0;
if (setjmp(urgcatch))
goto cleanup_recv_data;
#define FILESIZECHECK(x) \
do { \
if (curclass.maxfilesize != -1 && \
(x) > curclass.maxfilesize) { \
errno = EFBIG; \
goto file_err; \
} \
} while (0)
switch (type) {
case TYPE_I:
case TYPE_L:
netfd = fileno(instr);
filefd = fileno(outstr);
(void) alarm(curclass.timeout);
if (curclass.rateput) {
while (1) {
int d;
struct timeval then, now, td;
off_t bufrem;
(void)gettimeofday(&then, NULL);
errno = c = d = 0;
for (bufrem = curclass.rateput; bufrem > 0; ) {
if ((c = read(netfd, buf,
MIN(sizeof(buf), bufrem))) <= 0)
goto recvdone;
FILESIZECHECK(byte_count + c);
if ((d = write(filefd, buf, c)) != c)
goto file_err;
(void) alarm(curclass.timeout);
bufrem -= c;
byte_count += c;
total_data_in += c;
total_data += c;
total_bytes_in += c;
total_bytes += c;
}
(void)gettimeofday(&now, NULL);
timersub(&now, &then, &td);
if (td.tv_sec == 0)
usleep(1000000 - td.tv_usec);
}
} else {
while ((c = read(netfd, buf, sizeof(buf))) > 0) {
FILESIZECHECK(byte_count + c);
if (write(filefd, buf, c) != c)
goto file_err;
(void) alarm(curclass.timeout);
byte_count += c;
total_data_in += c;
total_data += c;
total_bytes_in += c;
total_bytes += c;
}
}
recvdone:
if (c < 0)
goto data_err;
rval = 0;
goto cleanup_recv_data;
case TYPE_E:
reply(553, "TYPE E not implemented.");
goto cleanup_recv_data;
case TYPE_A:
(void) alarm(curclass.timeout);
/* XXXLUKEM: rate limit ascii receive (put) */
while ((c = getc(instr)) != EOF) {
byte_count++;
total_data_in++;
total_data++;
total_bytes_in++;
total_bytes++;
if ((byte_count % 4096) == 0)
(void) alarm(curclass.timeout);
if (c == '\n')
bare_lfs++;
while (c == '\r') {
if (ferror(outstr))
goto data_err;
if ((c = getc(instr)) != '\n') {
byte_count++;
total_data_in++;
total_data++;
total_bytes_in++;
total_bytes++;
if ((byte_count % 4096) == 0)
(void) alarm(curclass.timeout);
byteswritten++;
FILESIZECHECK(byteswritten);
(void) putc ('\r', outstr);
if (c == '\0' || c == EOF)
goto contin2;
}
}
byteswritten++;
FILESIZECHECK(byteswritten);
(void) putc(c, outstr);
contin2: ;
}
(void) alarm(0);
fflush(outstr);
if (ferror(instr))
goto data_err;
if (ferror(outstr))
goto file_err;
if (bare_lfs) {
reply(-226,
"WARNING! %d bare linefeeds received in ASCII mode",
bare_lfs);
reply(0, "File may not have transferred correctly.");
}
rval = 0;
goto cleanup_recv_data;
default:
reply(550, "Unimplemented TYPE %d in receive_data", type);
goto cleanup_recv_data;
}
#undef FILESIZECHECK
data_err:
(void) alarm(0);
perror_reply(426, "Data Connection");
goto cleanup_recv_data;
file_err:
(void) alarm(0);
perror_reply(452, "Error writing file");
goto cleanup_recv_data;
cleanup_recv_data:
(void) alarm(0);
transflag = 0;
total_files_in++;
total_files++;
total_xfers_in++;
total_xfers++;
return (rval);
}
void
statcmd(void)
{
struct sockinet *su = NULL;
static char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV];
u_char *a, *p;
int ispassive, af;
off_t otbi, otbo, otb;
a = p = (u_char *)NULL;
reply(-211, "%s FTP server status:", hostname);
reply(0, "Version: %s", EMPTYSTR(version) ? "<suppressed>" : version);
hbuf[0] = '\0';
if (!getnameinfo((struct sockaddr *)&his_addr.si_su, his_addr.su_len,
hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST)
&& strcmp(remotehost, hbuf) != 0)
reply(0, "Connected to %s (%s)", remotehost, hbuf);
else
reply(0, "Connected to %s", remotehost);
if (logged_in) {
if (curclass.type == CLASS_GUEST)
reply(0, "Logged in anonymously");
else
reply(0, "Logged in as %s%s", pw->pw_name,
curclass.type == CLASS_CHROOT ? " (chroot)" : "");
} else if (askpasswd)
reply(0, "Waiting for password");
else
reply(0, "Waiting for user name");
cprintf(stdout, " TYPE: %s", typenames[type]);
if (type == TYPE_A || type == TYPE_E)
cprintf(stdout, ", FORM: %s", formnames[form]);
if (type == TYPE_L) {
#if NBBY == 8
cprintf(stdout, " %d", NBBY);
#else
/* XXX: `bytesize' needs to be defined in this case */
cprintf(stdout, " %d", bytesize);
#endif
}
cprintf(stdout, "; STRUcture: %s; transfer MODE: %s\r\n",
strunames[stru], modenames[mode]);
ispassive = 0;
if (data != -1) {
reply(0, "Data connection open");
su = NULL;
} else if (pdata != -1) {
reply(0, "in Passive mode");
if (curclass.advertise.su_len != 0)
su = &curclass.advertise;
else
su = &pasv_addr;
ispassive = 1;
goto printaddr;
} else if (usedefault == 0) {
if (epsvall) {
reply(0, "EPSV only mode (EPSV ALL)");
goto epsvonly;
}
su = (struct sockinet *)&data_dest;
printaddr:
/* PASV/PORT */
if (su->su_family == AF_INET) {
a = (u_char *) &su->su_addr;
p = (u_char *) &su->su_port;
#define UC(b) (((int) b) & 0xff)
reply(0, "%s (%d,%d,%d,%d,%d,%d)",
ispassive ? "PASV" : "PORT" ,
UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]),
UC(p[0]), UC(p[1]));
}
/* LPSV/LPRT */
{
int alen, i;
alen = 0;
switch (su->su_family) {
case AF_INET:
a = (u_char *) &su->su_addr;
p = (u_char *) &su->su_port;
alen = sizeof(su->su_addr);
af = 4;
break;
#ifdef INET6
case AF_INET6:
a = (u_char *) &su->su_6addr;
p = (u_char *) &su->su_port;
alen = sizeof(su->su_6addr);
af = 6;
break;
#endif
default:
af = 0;
break;
}
if (af) {
cprintf(stdout, " %s (%d,%d",
ispassive ? "LPSV" : "LPRT", af, alen);
for (i = 0; i < alen; i++)
cprintf(stdout, ",%d", UC(a[i]));
cprintf(stdout, ",%d,%d,%d)\r\n",
2, UC(p[0]), UC(p[1]));
#undef UC
}
}
/* EPRT/EPSV */
epsvonly:
af = af2epsvproto(su->su_family);
hbuf[0] = '\0';
if (af > 0) {
struct sockinet tmp;
tmp = *su;
#ifdef INET6
if (tmp.su_family == AF_INET6)
tmp.su_scope_id = 0;
#endif
if (getnameinfo((struct sockaddr *)&tmp.si_su,
tmp.su_len, hbuf, sizeof(hbuf), sbuf, sizeof(sbuf),
NI_NUMERICHOST | NI_NUMERICSERV) == 0)
reply(0, "%s (|%d|%s|%s|)",
ispassive ? "EPSV" : "EPRT",
af, hbuf, sbuf);
}
} else
reply(0, "No data connection");
if (logged_in) {
reply(0,
"Data sent: " LLF " byte%s in " LLF " file%s",
(LLT)total_data_out, PLURAL(total_data_out),
(LLT)total_files_out, PLURAL(total_files_out));
reply(0,
"Data received: " LLF " byte%s in " LLF " file%s",
(LLT)total_data_in, PLURAL(total_data_in),
(LLT)total_files_in, PLURAL(total_files_in));
reply(0,
"Total data: " LLF " byte%s in " LLF " file%s",
(LLT)total_data, PLURAL(total_data),
(LLT)total_files, PLURAL(total_files));
}
otbi = total_bytes_in;
otbo = total_bytes_out;
otb = total_bytes;
reply(0, "Traffic sent: " LLF " byte%s in " LLF " transfer%s",
(LLT)otbo, PLURAL(otbo),
(LLT)total_xfers_out, PLURAL(total_xfers_out));
reply(0, "Traffic received: " LLF " byte%s in " LLF " transfer%s",
(LLT)otbi, PLURAL(otbi),
(LLT)total_xfers_in, PLURAL(total_xfers_in));
reply(0, "Total traffic: " LLF " byte%s in " LLF " transfer%s",
(LLT)otb, PLURAL(otb),
(LLT)total_xfers, PLURAL(total_xfers));
if (logged_in && !CURCLASS_FLAGS_ISSET(private)) {
struct ftpconv *cp;
reply(0, "%s", "");
reply(0, "Class: %s, type: %s",
curclass.classname, CURCLASSTYPE);
reply(0, "Check PORT/LPRT commands: %sabled",
CURCLASS_FLAGS_ISSET(checkportcmd) ? "en" : "dis");
if (! EMPTYSTR(curclass.display))
reply(0, "Display file: %s", curclass.display);
if (! EMPTYSTR(curclass.notify))
reply(0, "Notify fileglob: %s", curclass.notify);
reply(0, "Idle timeout: " LLF ", maximum timeout: " LLF,
(LLT)curclass.timeout, (LLT)curclass.maxtimeout);
reply(0, "Current connections: %d", connections);
if (curclass.limit == -1)
reply(0, "Maximum connections: unlimited");
else
reply(0, "Maximum connections: " LLF,
(LLT)curclass.limit);
if (curclass.limitfile)
reply(0, "Connection limit exceeded message file: %s",
conffilename(curclass.limitfile));
if (! EMPTYSTR(curclass.chroot))
reply(0, "Chroot format: %s", curclass.chroot);
reply(0, "Deny bad ftpusers(5) quickly: %sabled",
CURCLASS_FLAGS_ISSET(denyquick) ? "en" : "dis");
if (! EMPTYSTR(curclass.homedir))
reply(0, "Homedir format: %s", curclass.homedir);
if (curclass.maxfilesize == -1)
reply(0, "Maximum file size: unlimited");
else
reply(0, "Maximum file size: " LLF,
(LLT)curclass.maxfilesize);
if (! EMPTYSTR(curclass.motd))
reply(0, "MotD file: %s", conffilename(curclass.motd));
reply(0,
"Modify commands (CHMOD, DELE, MKD, RMD, RNFR, UMASK): %sabled",
CURCLASS_FLAGS_ISSET(modify) ? "en" : "dis");
reply(0, "Upload commands (APPE, STOR, STOU): %sabled",
CURCLASS_FLAGS_ISSET(upload) ? "en" : "dis");
reply(0, "Sanitize file names: %sabled",
CURCLASS_FLAGS_ISSET(sanenames) ? "en" : "dis");
reply(0, "PASV/LPSV/EPSV connections: %sabled",
CURCLASS_FLAGS_ISSET(passive) ? "en" : "dis");
if (curclass.advertise.su_len != 0) {
char buf[50]; /* big enough for IPv6 address */
const char *bp;
bp = inet_ntop(curclass.advertise.su_family,
(void *)&curclass.advertise.su_addr,
buf, sizeof(buf));
if (bp != NULL)
reply(0, "PASV advertise address: %s", bp);
}
if (curclass.portmin && curclass.portmax)
reply(0, "PASV port range: " LLF " - " LLF,
(LLT)curclass.portmin, (LLT)curclass.portmax);
if (curclass.rateget)
reply(0, "Rate get limit: " LLF " bytes/sec",
(LLT)curclass.rateget);
else
reply(0, "Rate get limit: disabled");
if (curclass.rateput)
reply(0, "Rate put limit: " LLF " bytes/sec",
(LLT)curclass.rateput);
else
reply(0, "Rate put limit: disabled");
if (curclass.mmapsize)
reply(0, "Mmap size: " LLF, (LLT)curclass.mmapsize);
else
reply(0, "Mmap size: disabled");
if (curclass.readsize)
reply(0, "Read size: " LLF, (LLT)curclass.readsize);
else
reply(0, "Read size: default");
if (curclass.writesize)
reply(0, "Write size: " LLF, (LLT)curclass.writesize);
else
reply(0, "Write size: default");
if (curclass.sendbufsize)
reply(0, "Send buffer size: " LLF,
(LLT)curclass.sendbufsize);
else
reply(0, "Send buffer size: default");
if (curclass.sendlowat)
reply(0, "Send low water mark: " LLF,
(LLT)curclass.sendlowat);
else
reply(0, "Send low water mark: default");
reply(0, "Umask: %.04o", curclass.umask);
for (cp = curclass.conversions; cp != NULL; cp=cp->next) {
if (cp->suffix == NULL || cp->types == NULL ||
cp->command == NULL)
continue;
reply(0, "Conversion: %s [%s] disable: %s, command: %s",
cp->suffix, cp->types, cp->disable, cp->command);
}
}
reply(211, "End of status");
}
void
fatal(const char *s)
{
reply(451, "Error in server: %s\n", s);
reply(221, "Closing connection due to server error.");
dologout(0);
/* NOTREACHED */
}
/*
* reply() --
* depending on the value of n, display fmt with a trailing CRLF and
* prefix of:
* n < -1 prefix the message with abs(n) + "-" (initial line)
* n == 0 prefix the message with 4 spaces (middle lines)
* n > 0 prefix the message with n + " " (final line)
*/
void
reply(int n, const char *fmt, ...)
{
off_t b;
va_list ap;
va_start(ap, fmt);
b = 0;
if (n == 0)
cprintf(stdout, " ");
else if (n < 0)
cprintf(stdout, "%d-", -n);
else
cprintf(stdout, "%d ", n);
b = vprintf(fmt, ap);
va_end(ap);
total_bytes += b;
total_bytes_out += b;
cprintf(stdout, "\r\n");
(void)fflush(stdout);
if (debug) {
syslog(LOG_DEBUG, "<--- %d%c", abs(n), (n < 0) ? '-' : ' ');
va_start(ap, fmt);
vsyslog(LOG_DEBUG, fmt, ap);
va_end(ap);
}
}
static void
logremotehost(struct sockinet *who)
{
if (getnameinfo((struct sockaddr *)&who->si_su,
who->su_len, remotehost, sizeof(remotehost), NULL, 0, 0))
strlcpy(remotehost, "?", sizeof(remotehost));
#if HAVE_SETPROCTITLE
snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost);
setproctitle("%s", proctitle);
#endif /* HAVE_SETPROCTITLE */
if (logging)
syslog(LOG_INFO, "connection from %s to %s",
remotehost, hostname);
}
/*
* Record logout in wtmp file and exit with supplied status.
*/
void
dologout(int status)
{
/*
* Prevent reception of SIGURG from resulting in a resumption
* back to the main program loop.
*/
transflag = 0;
logout_utmp();
if (logged_in) {
#ifdef KERBEROS
if (!notickets && krbtkfile_env)
unlink(krbtkfile_env);
#endif
}
/* beware of flushing buffers after a SIGPIPE */
_exit(status);
}
void
abor(void)
{
tmpline[0] = '\0';
is_oob = 0;
reply(426, "Transfer aborted. Data connection closed.");
reply(226, "Abort successful");
longjmp(urgcatch, 1);
}
void
statxfer(void)
{
tmpline[0] = '\0';
is_oob = 0;
if (file_size != (off_t) -1)
reply(213,
"Status: " LLF " of " LLF " byte%s transferred",
(LLT)byte_count, (LLT)file_size,
PLURAL(byte_count));
else
reply(213, "Status: " LLF " byte%s transferred",
(LLT)byte_count, PLURAL(byte_count));
}
static void
myoob(int signo)
{
char *cp;
/* only process if transfer occurring */
if (!transflag)
return;
cp = tmpline;
if (getline(cp, sizeof(tmpline), stdin) == NULL) {
reply(221, "You could at least say goodbye.");
dologout(0);
}
is_oob = 1;
ftp_handle_line(cp);
is_oob = 0;
}
static int
bind_pasv_addr(void)
{
static int passiveport;
int port, len;
len = pasv_addr.su_len;
if (curclass.portmin == 0 && curclass.portmax == 0) {
pasv_addr.su_port = 0;
return (bind(pdata, (struct sockaddr *)&pasv_addr.si_su, len));
}
if (passiveport == 0) {
srand(getpid());
passiveport = rand() % (curclass.portmax - curclass.portmin)
+ curclass.portmin;
}
port = passiveport;
while (1) {
port++;
if (port > curclass.portmax)
port = curclass.portmin;
else if (port == passiveport) {
errno = EAGAIN;
return (-1);
}
pasv_addr.su_port = htons(port);
if (bind(pdata, (struct sockaddr *)&pasv_addr.si_su, len) == 0)
break;
if (errno != EADDRINUSE)
return (-1);
}
passiveport = port;
return (0);
}
/*
* Note: a response of 425 is not mentioned as a possible response to
* the PASV command in RFC959. However, it has been blessed as
* a legitimate response by Jon Postel in a telephone conversation
* with Rick Adams on 25 Jan 89.
*/
void
passive(void)
{
int len;
char *p, *a;
if (pdata >= 0)
close(pdata);
pdata = socket(AF_INET, SOCK_STREAM, 0);
if (pdata < 0 || !logged_in) {
perror_reply(425, "Can't open passive connection");
return;
}
pasv_addr = ctrl_addr;
if (bind_pasv_addr() < 0)
goto pasv_error;
len = pasv_addr.su_len;
if (getsockname(pdata, (struct sockaddr *) &pasv_addr.si_su, &len) < 0)
goto pasv_error;
pasv_addr.su_len = len;
if (listen(pdata, 1) < 0)
goto pasv_error;
if (curclass.advertise.su_len != 0)
a = (char *) &curclass.advertise.su_addr;
else
a = (char *) &pasv_addr.su_addr;
p = (char *) &pasv_addr.su_port;
#define UC(b) (((int) b) & 0xff)
reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]),
UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1]));
return;
pasv_error:
(void) close(pdata);
pdata = -1;
perror_reply(425, "Can't open passive connection");
return;
}
/*
* convert protocol identifier to/from AF
*/
int
lpsvproto2af(int proto)
{
switch (proto) {
case 4:
return AF_INET;
#ifdef INET6
case 6:
return AF_INET6;
#endif
default:
return -1;
}
}
int
af2lpsvproto(int af)
{
switch (af) {
case AF_INET:
return 4;
#ifdef INET6
case AF_INET6:
return 6;
#endif
default:
return -1;
}
}
int
epsvproto2af(int proto)
{
switch (proto) {
case 1:
return AF_INET;
#ifdef INET6
case 2:
return AF_INET6;
#endif
default:
return -1;
}
}
int
af2epsvproto(int af)
{
switch (af) {
case AF_INET:
return 1;
#ifdef INET6
case AF_INET6:
return 2;
#endif
default:
return -1;
}
}
/*
* 228 Entering Long Passive Mode (af, hal, h1, h2, h3,..., pal, p1, p2...)
* 229 Entering Extended Passive Mode (|||port|)
*/
void
long_passive(char *cmd, int pf)
{
int len;
char *p, *a;
if (!logged_in) {
syslog(LOG_NOTICE, "long passive but not logged in");
reply(503, "Login with USER first.");
return;
}
if (pf != PF_UNSPEC && ctrl_addr.su_family != pf) {
/*
* XXX: only EPRT/EPSV ready clients will understand this
*/
if (strcmp(cmd, "EPSV") != 0)
reply(501, "Network protocol mismatch"); /*XXX*/
else
epsv_protounsupp("Network protocol mismatch");
return;
}
if (pdata >= 0)
close(pdata);
pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0);
if (pdata < 0) {
perror_reply(425, "Can't open passive connection");
return;
}
pasv_addr = ctrl_addr;
if (bind_pasv_addr() < 0)
goto pasv_error;
len = pasv_addr.su_len;
if (getsockname(pdata, (struct sockaddr *) &pasv_addr.si_su, &len) < 0)
goto pasv_error;
pasv_addr.su_len = len;
if (listen(pdata, 1) < 0)
goto pasv_error;
p = (char *) &pasv_addr.su_port;
#define UC(b) (((int) b) & 0xff)
if (strcmp(cmd, "LPSV") == 0) {
struct sockinet *advert;
if (curclass.advertise.su_len != 0)
advert = &curclass.advertise;
else
advert = &pasv_addr;
switch (advert->su_family) {
case AF_INET:
a = (char *) &advert->su_addr;
reply(228,
"Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)",
4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]),
2, UC(p[0]), UC(p[1]));
return;
#ifdef INET6
case AF_INET6:
a = (char *) &advert->su_6addr;
reply(228,
"Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)",
6, 16,
UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]),
UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]),
UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]),
UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]),
2, UC(p[0]), UC(p[1]));
return;
#endif
}
#undef UC
} else if (strcmp(cmd, "EPSV") == 0) {
switch (pasv_addr.su_family) {
case AF_INET:
#ifdef INET6
case AF_INET6:
#endif
reply(229, "Entering Extended Passive Mode (|||%d|)",
ntohs(pasv_addr.su_port));
return;
}
} else {
/* more proper error code? */
}
pasv_error:
(void) close(pdata);
pdata = -1;
perror_reply(425, "Can't open passive connection");
return;
}
int
extended_port(const char *arg)
{
char *tmp = NULL;
char *result[3];
char *p, *q;
char delim;
struct addrinfo hints;
struct addrinfo *res = NULL;
int i;
unsigned long proto;
tmp = xstrdup(arg);
p = tmp;
delim = p[0];
p++;
memset(result, 0, sizeof(result));
for (i = 0; i < 3; i++) {
q = strchr(p, delim);
if (!q || *q != delim)
goto parsefail;
*q++ = '\0';
result[i] = p;
p = q;
}
/* some more sanity checks */
errno = 0;
p = NULL;
(void)strtoul(result[2], &p, 10);
if (errno || !*result[2] || *p)
goto parsefail;
errno = 0;
p = NULL;
proto = strtoul(result[0], &p, 10);
if (errno || !*result[0] || *p)
goto protounsupp;
memset(&hints, 0, sizeof(hints));
hints.ai_family = epsvproto2af((int)proto);
if (hints.ai_family < 0)
goto protounsupp;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_NUMERICHOST;
if (getaddrinfo(result[1], result[2], &hints, &res))
goto parsefail;
if (res->ai_next)
goto parsefail;
if (sizeof(data_dest) < res->ai_addrlen)
goto parsefail;
memcpy(&data_dest.si_su, res->ai_addr, res->ai_addrlen);
data_dest.su_len = res->ai_addrlen;
#ifdef INET6
if (his_addr.su_family == AF_INET6 &&
data_dest.su_family == AF_INET6) {
/* XXX: more sanity checks! */
data_dest.su_scope_id = his_addr.su_scope_id;
}
#endif
if (tmp != NULL)
free(tmp);
if (res)
freeaddrinfo(res);
return 0;
parsefail:
reply(500, "Invalid argument, rejected.");
usedefault = 1;
if (tmp != NULL)
free(tmp);
if (res)
freeaddrinfo(res);
return -1;
protounsupp:
epsv_protounsupp("Protocol not supported");
usedefault = 1;
if (tmp != NULL)
free(tmp);
if (res)
freeaddrinfo(res);
return -1;
}
/*
* 522 Protocol not supported (proto,...)
* as we assume address family for control and data connections are the same,
* we do not return the list of address families we support - instead, we
* return the address family of the control connection.
*/
void
epsv_protounsupp(const char *message)
{
int proto;
proto = af2epsvproto(ctrl_addr.su_family);
if (proto < 0)
reply(501, "%s", message); /* XXX */
else
reply(522, "%s, use (%d)", message, proto);
}
/*
* Generate unique name for file with basename "local".
* The file named "local" is already known to exist.
* Generates failure reply on error.
*
* XXX: this function should under go changes similar to
* the mktemp(3)/mkstemp(3) changes.
*/
static char *
gunique(const char *local)
{
static char new[MAXPATHLEN];
struct stat st;
char *cp;
int count;
cp = strrchr(local, '/');
if (cp)
*cp = '\0';
if (stat(cp ? local : ".", &st) < 0) {
perror_reply(553, cp ? local : ".");
return (NULL);
}
if (cp)
*cp = '/';
for (count = 1; count < 100; count++) {
(void)snprintf(new, sizeof(new) - 1, "%s.%d", local, count);
if (stat(new, &st) < 0)
return (new);
}
reply(452, "Unique file name cannot be created.");
return (NULL);
}
/*
* Format and send reply containing system error number.
*/
void
perror_reply(int code, const char *string)
{
int save_errno;
save_errno = errno;
reply(code, "%s: %s.", string, strerror(errno));
errno = save_errno;
}
static char *onefile[] = {
"",
0
};
void
send_file_list(const char *whichf)
{
struct stat st;
DIR *dirp = NULL;
struct dirent *dir;
FILE *dout = NULL;
char **dirlist, *dirname, *notglob, *p;
int simple = 0;
int freeglob = 0;
glob_t gl;
#ifdef __GNUC__
(void) &dout;
(void) &dirlist;
(void) &simple;
(void) &freeglob;
#endif
p = NULL;
if (strpbrk(whichf, "~{[*?") != NULL) {
int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE|GLOB_LIMIT;
memset(&gl, 0, sizeof(gl));
freeglob = 1;
if (glob(whichf, flags, 0, &gl)) {
reply(550, "not found");
goto out;
} else if (gl.gl_pathc == 0) {
errno = ENOENT;
perror_reply(550, whichf);
goto out;
}
dirlist = gl.gl_pathv;
} else {
notglob = xstrdup(whichf);
onefile[0] = notglob;
dirlist = onefile;
simple = 1;
}
/* XXX: } for vi sm */
if (setjmp(urgcatch)) {
transflag = 0;
goto out;
}
while ((dirname = *dirlist++) != NULL) {
int trailingslash = 0;
if (stat(dirname, &st) < 0) {
/*
* If user typed "ls -l", etc, and the client
* used NLST, do what the user meant.
*/
/* XXX: nuke this support? */
if (dirname[0] == '-' && *dirlist == NULL &&
transflag == 0) {
char *argv[] = { INTERNAL_LS, "", NULL };
argv[1] = dirname;
retrieve(argv, dirname);
goto out;
}
perror_reply(550, whichf);
goto cleanup_send_file_list;
}
if (S_ISREG(st.st_mode)) {
/*
* XXXRFC:
* should we follow RFC959 and not work
* for non directories?
*/
if (dout == NULL) {
dout = dataconn("file list", (off_t)-1, "w");
if (dout == NULL)
goto out;
transflag++;
}
cprintf(dout, "%s%s\n", dirname,
type == TYPE_A ? "\r" : "");
continue;
} else if (!S_ISDIR(st.st_mode))
continue;
if (dirname[strlen(dirname) - 1] == '/')
trailingslash++;
if ((dirp = opendir(dirname)) == NULL)
continue;
while ((dir = readdir(dirp)) != NULL) {
char nbuf[MAXPATHLEN];
if (ISDOTDIR(dir->d_name) || ISDOTDOTDIR(dir->d_name))
continue;
(void)snprintf(nbuf, sizeof(nbuf), "%s%s%s", dirname,
trailingslash ? "" : "/", dir->d_name);
/*
* We have to do a stat to ensure it's
* not a directory or special file.
*/
/*
* XXXRFC:
* should we follow RFC959 and filter out
* non files ? lukem - NO!, or not until
* our ftp client uses MLS{T,D} for completion.
*/
if (simple || (stat(nbuf, &st) == 0 &&
S_ISREG(st.st_mode))) {
if (dout == NULL) {
dout = dataconn("file list", (off_t)-1,
"w");
if (dout == NULL)
goto out;
transflag++;
}
p = nbuf;
if (nbuf[0] == '.' && nbuf[1] == '/')
p = &nbuf[2];
cprintf(dout, "%s%s\n", p,
type == TYPE_A ? "\r" : "");
}
}
(void) closedir(dirp);
}
if (dout == NULL)
reply(550, "No files found.");
else if (ferror(dout) != 0)
perror_reply(550, "Data connection");
else
reply(226, "Transfer complete.");
cleanup_send_file_list:
transflag = 0;
closedataconn(dout);
out:
total_xfers++;
total_xfers_out++;
if (notglob)
free(notglob);
if (freeglob)
globfree(&gl);
}
char *
conffilename(const char *s)
{
static char filename[MAXPATHLEN];
if (*s == '/')
strlcpy(filename, s, sizeof(filename));
else
(void)snprintf(filename, sizeof(filename), "%s/%s", confdir ,s);
return (filename);
}
/*
* logxfer --
* if logging > 1, then based on the arguments, syslog a message:
* if bytes != -1 "<command> <file1> = <bytes> bytes"
* else if file2 != NULL "<command> <file1> <file2>"
* else "<command> <file1>"
* if elapsed != NULL, append "in xxx.yyy seconds"
* if error != NULL, append ": " + error
*
* if doxferlog != 0, bytes != -1, and command is "get", "put",
* or "append", syslog a wu-ftpd style xferlog entry
*/
void
logxfer(const char *command, off_t bytes, const char *file1, const char *file2,
const struct timeval *elapsed, const char *error)
{
char buf[MAXPATHLEN * 2 + 100], realfile[MAXPATHLEN];
const char *r1, *r2;
char direction;
size_t len;
time_t now;
if (logging <=1 && !doxferlog)
return;
r1 = r2 = NULL;
if ((r1 = realpath(file1, realfile)) == NULL)
r1 = file1;
if (file2 != NULL)
if ((r2 = realpath(file2, realfile)) == NULL)
r2 = file2;
/*
* syslog command
*/
if (logging > 1) {
len = snprintf(buf, sizeof(buf), "%s %s", command, r1);
if (bytes != (off_t)-1)
len += snprintf(buf + len, sizeof(buf) - len,
" = " LLF " byte%s", (LLT) bytes, PLURAL(bytes));
else if (r2 != NULL)
len += snprintf(buf + len, sizeof(buf) - len,
" %s", r2);
if (elapsed != NULL)
len += snprintf(buf + len, sizeof(buf) - len,
" in %ld.%.03d seconds", elapsed->tv_sec,
(int)(elapsed->tv_usec / 1000));
if (error != NULL)
len += snprintf(buf + len, sizeof(buf) - len,
": %s", error);
syslog(LOG_INFO, "%s", buf);
}
/*
* syslog wu-ftpd style log entry, prefixed with "xferlog: "
*/
if (!doxferlog || bytes == -1)
return;
if (strcmp(command, "get") == 0)
direction = 'o';
else if (strcmp(command, "put") == 0 || strcmp(command, "append") == 0)
direction = 'i';
else
return;
time(&now);
syslog(LOG_INFO,
"xferlog%s: %.24s %ld %s " LLF " %s %c %s %c %c %s FTP 0 * %c",
/*
* XXX: wu-ftpd puts (send) or (recv) in the syslog message, and removes
* the full date. This may be problematic for accurate log parsing,
* given that syslog messages don't contain the full date.
*/
#if 1 /* lukem's method; easier to convert to actual xferlog file */
"",
ctime(&now),
#else /* wu-ftpd's syslog method, with an extra unneeded space */
(direction == 'i') ? " (recv)" : " (send)",
"",
#endif
elapsed == NULL ? 0 : elapsed->tv_sec + (elapsed->tv_usec > 0),
remotehost,
(LLT) bytes,
r1,
type == TYPE_A ? 'a' : 'b',
"_", /* XXX: take conversions into account? */
direction,
curclass.type == CLASS_GUEST ? 'a' :
curclass.type == CLASS_CHROOT ? 'g' :
curclass.type == CLASS_REAL ? 'r' : '?',
curclass.type == CLASS_GUEST ? pw->pw_passwd : pw->pw_name,
error != NULL ? 'i' : 'c'
);
}
/*
* Log the resource usage.
*
* XXX: more resource usage to logging?
*/
void
logrusage(const struct rusage *rusage_before,
const struct rusage *rusage_after)
{
struct timeval usrtime, systime;
if (logging <= 1)
return;
timersub(&rusage_after->ru_utime, &rusage_before->ru_utime, &usrtime);
timersub(&rusage_after->ru_stime, &rusage_before->ru_stime, &systime);
syslog(LOG_INFO, "%ld.%.03du %ld.%.03ds %ld+%ldio %ldpf+%ldw",
usrtime.tv_sec, (int)(usrtime.tv_usec / 1000),
systime.tv_sec, (int)(systime.tv_usec / 1000),
rusage_after->ru_inblock - rusage_before->ru_inblock,
rusage_after->ru_oublock - rusage_before->ru_oublock,
rusage_after->ru_majflt - rusage_before->ru_majflt,
rusage_after->ru_nswap - rusage_before->ru_nswap);
}
/*
* Determine if `password' is valid for user given in `pw'.
* Returns 2 if password expired, 1 if otherwise failed, 0 if ok
*/
int
checkpassword(const struct passwd *pwent, const char *password)
{
char *orig, *new;
time_t expire;
expire = 0;
if (pwent == NULL)
return 1;
orig = pwent->pw_passwd; /* save existing password */
expire = pwent->pw_expire;
if (orig[0] == '\0') /* don't allow empty passwords */
return 1;
new = crypt(password, orig); /* encrypt given password */
if (strcmp(new, orig) != 0) /* compare */
return 1;
if (expire && time(NULL) >= expire)
return 2; /* check if expired */
return 0; /* OK! */
}
char *
xstrdup(const char *s)
{
char *new = strdup(s);
if (new == NULL)
fatal("Local resource failure: malloc");
/* NOTREACHED */
return (new);
}
/*
* As per fprintf(), but increment total_bytes and total_bytes_out,
* by the appropriate amount.
*/
void
cprintf(FILE *fd, const char *fmt, ...)
{
off_t b;
va_list ap;
va_start(ap, fmt);
b = vfprintf(fd, fmt, ap);
va_end(ap);
total_bytes += b;
total_bytes_out += b;
}
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