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NetBSD/libexec/ftpd/ftpd.c

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/* $NetBSD: ftpd.c,v 1.61 1998/12/28 04:54:01 lukem Exp $ */
/*
* 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.
*/
#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 1.61 1998/12/28 04:54:01 lukem 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 <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 <limits.h>
#include <netdb.h>
#include <pwd.h>
#include <setjmp.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <time.h>
#include <unistd.h>
#ifdef SKEY
#include <skey.h>
#endif
#ifdef KERBEROS5
#include <krb5.h>
#endif
#include "extern.h"
#include "pathnames.h"
#if __STDC__
#include <stdarg.h>
#else
#include <varargs.h>
#endif
#ifndef TRUE
#define TRUE 1
#define FALSE 0
#endif
const char version[] = "Version: 7.1.0";
struct sockaddr_in ctrl_addr;
struct sockaddr_in data_source;
struct sockaddr_in data_dest;
struct sockaddr_in his_addr;
struct sockaddr_in pasv_addr;
int data;
jmp_buf errcatch, urgcatch;
int logged_in;
struct passwd *pw;
int debug;
int sflag;
int logging;
int guest;
int dochroot;
int type;
int form;
int stru; /* avoid C keyword */
int mode;
int usedefault = 1; /* for data transfers */
int pdata = -1; /* for passive mode */
sig_atomic_t transflag;
off_t file_size;
off_t byte_count;
char tmpline[7];
char hostname[MAXHOSTNAMELEN+1];
char remotehost[MAXHOSTNAMELEN+1];
static char ttyline[20];
char *tty = ttyline; /* for klogin */
static char *anondir = NULL;
static char confdir[MAXPATHLEN];
#if defined(KERBEROS) || defined(KERBEROS5)
int notickets = 1;
char *krbtkfile_env = NULL;
#endif
/*
* 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;
#ifdef HASSETPROCTITLE
char proctitle[BUFSIZ]; /* initial part of title */
#endif /* HASSETPROCTITLE */
static void ack __P((char *));
static void myoob __P((int));
static int checkuser __P((const char *, const char *, int, int));
static int checkaccess __P((const char *));
static FILE *dataconn __P((char *, off_t, char *));
static void dolog __P((struct sockaddr_in *));
static void end_login __P((void));
static FILE *getdatasock __P((char *));
static char *gunique __P((char *));
static void lostconn __P((int));
static int receive_data __P((FILE *, FILE *));
static void replydirname __P((const char *, const char *));
static int send_data __P((FILE *, FILE *, off_t));
static struct passwd *
sgetpwnam __P((const char *));
int main __P((int, char *[]));
#if defined(KERBEROS) || defined(KERBEROS5)
int klogin __P((struct passwd *, char *, char *, char *));
void kdestroy __P((void));
#endif
int
main(argc, argv)
int argc;
char *argv[];
{
int addrlen, ch, on = 1, tos;
char *cp, line[LINE_MAX];
FILE *fd;
#ifdef KERBEROS5
krb5_error_code kerror;
#endif
debug = 0;
logging = 0;
sflag = 0;
(void)strcpy(confdir, _DEFAULT_CONFDIR);
while ((ch = getopt(argc, argv, "a:c:C:dlst:T:u:v")) != -1) {
switch (ch) {
case 'a':
anondir = optarg;
break;
case 'c':
(void)strncpy(confdir, optarg, sizeof(confdir));
confdir[sizeof(confdir)-1] = '\0';
break;
case 'C':
exit(checkaccess(optarg));
/* NOTREACHED */
case 'd':
case 'v': /* deprecated */
debug = 1;
break;
case 'l':
logging++; /* > 1 == extra logging */
break;
case 's':
sflag = 1;
break;
case 't':
case 'T':
case 'u':
warnx("-%c has been deprecated in favour of ftpd.conf",
ch);
break;
default:
if (optopt == 'a' || optopt == 'C')
exit(1);
warnx("unknown flag -%c ignored", optopt);
break;
}
}
/*
* 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);
addrlen = sizeof(his_addr);
if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) {
syslog(LOG_ERR, "getpeername (%s): %m",argv[0]);
exit(1);
}
addrlen = sizeof(ctrl_addr);
if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) {
syslog(LOG_ERR, "getsockname (%s): %m",argv[0]);
exit(1);
}
#ifdef IP_TOS
tos = IPTOS_LOWDELAY;
if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, sizeof(int)) < 0)
syslog(LOG_WARNING, "setsockopt (IP_TOS): %m");
#endif
data_source.sin_port = htons(ntohs(ctrl_addr.sin_port) - 1);
/* 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 ((long)signal(SIGURG, myoob) < 0)
syslog(LOG_ERR, "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_ERR, "setsockopt: %m");
#endif
#ifdef F_SETOWN
if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1)
syslog(LOG_ERR, "fcntl F_SETOWN: %m");
#endif
dolog(&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_NOTICE, "%s when initializing Kerberos context",
error_message(kerror));
exit(0);
}
#endif /* KERBEROS5 */
/* If logins are disabled, print out the message. */
if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) {
while (fgets(line, sizeof(line), fd) != NULL) {
if ((cp = strchr(line, '\n')) != NULL)
*cp = '\0';
lreply(530, "%s", line);
}
(void) fflush(stdout);
(void) fclose(fd);
reply(530, "System not available.");
exit(0);
}
if ((fd = fopen(conffilename(_PATH_FTPWELCOME), "r")) != NULL) {
while (fgets(line, sizeof(line), fd) != NULL) {
if ((cp = strchr(line, '\n')) != NULL)
*cp = '\0';
lreply(220, "%s", line);
}
(void) fflush(stdout);
(void) fclose(fd);
/* reply(220,) must follow */
}
(void)gethostname(hostname, sizeof(hostname));
hostname[sizeof(hostname) - 1] = '\0';
reply(220, "%s FTP server (%s) ready.", hostname, version);
curclass.timeout = 300; /* 5 minutes, as per login(1) */
(void) setjmp(errcatch);
for (;;)
(void) yyparse();
/* NOTREACHED */
}
static void
lostconn(signo)
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(name)
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);
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 char curname[10]; /* 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(name)
char *name;
{
if (logged_in) {
if (guest) {
reply(530, "Can't change user from guest login.");
return;
} else if (dochroot) {
reply(530, "Can't change user from chroot user.");
return;
}
end_login();
}
#if defined(KERBEROS) || defined(KERBEROS5)
kdestroy();
#endif
guest = 0;
if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) {
if (checkaccess("ftp") || checkaccess("anonymous"))
reply(530, "User %s access denied.", name);
else if ((pw = sgetpwnam("ftp")) != NULL) {
guest = 1;
askpasswd = 1;
reply(331,
"Guest login ok, type your name as password.");
} else
reply(530, "User %s unknown.", name);
if (!askpasswd && logging)
syslog(LOG_NOTICE,
"ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost);
return;
}
pw = sgetpwnam(name);
if (logging)
strncpy(curname, name, sizeof(curname)-1);
#ifdef SKEY
if (skey_haskey(name) == 0) {
char *myskey;
myskey = skey_keyinfo(name);
reply(331, "Password [%s] required for %s.",
myskey ? myskey : "error getting challenge", name);
} else
#endif
reply(331, "Password required for %s.", name);
askpasswd = 1;
/*
* Delay before reading passwd after first failed
* attempt to slow down passwd-guessing programs.
*/
if (login_attempts)
sleep((unsigned) login_attempts);
}
/*
* 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 compatability, `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 FALSE if the user is denied, or TRUE if they are allowed.
*/
int
checkuser(fname, name, def, nofile)
const char *fname, *name;
int def, nofile;
{
FILE *fd;
int retval;
char *glob, *perm, line[BUFSIZ];
retval = def;
if ((fd = fopen(conffilename(fname), "r")) == NULL)
return nofile;
while (fgets(line, sizeof(line), fd) != NULL) {
glob = strtok(line, " \t\n");
if (glob[0] == '#')
continue;
perm = strtok(NULL, " \t\n");
if (fnmatch(glob, name, 0) == 0) {
if (perm != NULL &&
((strcasecmp(perm, "allow") == 0) ||
(strcasecmp(perm, "yes") == 0)))
retval = TRUE;
else if (perm != NULL &&
((strcasecmp(perm, "deny") == 0) ||
(strcasecmp(perm, "no") == 0)))
retval = FALSE;
else
retval = !def;
break;
}
}
(void) fclose(fd);
return (retval);
}
/*
* Check if user is allowed by /etc/ftpusers
* returns 0 for yes, 1 for no
*/
int
checkaccess(name)
const char *name;
{
return (! checkuser(_PATH_FTPUSERS, name, TRUE, FALSE));
}
/*
* Terminate login as previous user, if any, resetting state;
* used when USER command is given or login fails.
*/
static void
end_login()
{
(void) seteuid((uid_t)0);
if (logged_in)
logwtmp(ttyline, "", "");
pw = NULL;
logged_in = 0;
guest = 0;
dochroot = 0;
}
void
pass(passwd)
char *passwd;
{
int rval;
FILE *fd;
char const *cp, *shell, *home;
if (logged_in || askpasswd == 0) {
reply(503, "Login with USER first.");
return;
}
askpasswd = 0;
if (!guest) { /* "ftp" is only account allowed no password */
if (pw == NULL) {
rval = 1; /* failure below */
goto skip;
}
#ifdef KERBEROS
if (klogin(pw, "", hostname, passwd) == 0) {
rval = 0;
goto skip;
}
#endif
#ifdef KERBEROS5
if (klogin(pw, "", hostname, passwd) == 0) {
rval = 0;
goto skip;
}
#endif
#ifdef SKEY
if (skey_haskey(pw->pw_name) == 0 &&
skey_passcheck(pw->pw_name, passwd) != -1) {
rval = 0;
goto skip;
}
#endif
if (!sflag && *pw->pw_passwd != '\0' &&
!strcmp(crypt(passwd, pw->pw_passwd), pw->pw_passwd)) {
rval = 0;
goto skip;
}
rval = 1;
skip:
if (pw != NULL && pw->pw_expire && time(NULL) >= pw->pw_expire)
rval = 2;
/*
* If rval > 0, the user failed the authentication check
* above. If rval == 0, either Kerberos or local authentication
* succeeded.
*/
if (rval) {
reply(530, 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 was ok; see if anything else prevents login */
if (checkaccess(pw->pw_name)) {
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);
pw = (struct passwd *) NULL;
return;
}
/* check for valid shell, if not guest user */
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 && guest == 0) {
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);
pw = (struct passwd *) NULL;
return;
}
login_attempts = 0; /* this time successful */
if (setegid((gid_t)pw->pw_gid) < 0) {
reply(550, "Can't set gid.");
return;
}
(void) initgroups(pw->pw_name, pw->pw_gid);
/* open wtmp before chroot */
logwtmp(ttyline, pw->pw_name, remotehost);
logged_in = 1;
dochroot = checkuser(_PATH_FTPCHROOT, pw->pw_name, FALSE, FALSE);
/* parse ftpd.conf, setting up various parameters */
if (guest)
parse_conf(CLASS_GUEST);
else if (dochroot)
parse_conf(CLASS_CHROOT);
else
parse_conf(CLASS_REAL);
home = "/";
if (guest) {
/*
* We MUST do a chdir() after the chroot. Otherwise
* the old current directory will be accessible as "."
* outside the new root!
*/
if (chroot(anondir ? anondir : pw->pw_dir) < 0 ||
chdir("/") < 0) {
reply(550, "Can't set guest privileges.");
goto bad;
}
} else if (dochroot) {
if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) {
reply(550, "Can't change root.");
goto bad;
}
} else if (chdir(pw->pw_dir) < 0) {
if (chdir("/") < 0) {
reply(530, "User %s: can't change directory to %s.",
pw->pw_name, pw->pw_dir);
goto bad;
} else
lreply(230, "No directory! Logging in with home=/");
} else
home = pw->pw_dir;
if (seteuid((uid_t)pw->pw_uid) < 0) {
reply(550, "Can't set uid.");
goto bad;
}
setenv("HOME", home, 1);
/*
* Display a login message, if it exists.
* N.B. reply(230,) must follow the message.
*/
if ((fd = fopen(conffilename(_PATH_FTPLOGINMESG), "r")) != NULL) {
char *cp, line[LINE_MAX];
while (fgets(line, sizeof(line), fd) != NULL) {
if ((cp = strchr(line, '\n')) != NULL)
*cp = '\0';
lreply(230, "%s", line);
}
(void) fflush(stdout);
(void) fclose(fd);
}
show_chdir_messages(230);
if (guest) {
reply(230, "Guest login ok, access restrictions apply.");
#ifdef HASSETPROCTITLE
snprintf(proctitle, sizeof(proctitle),
"%s: anonymous/%.*s", remotehost,
(int) (sizeof(proctitle) - sizeof(remotehost) -
sizeof(": anonymous/")), passwd);
setproctitle(proctitle);
#endif /* HASSETPROCTITLE */
if (logging)
syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s",
remotehost, passwd);
} else {
reply(230, "User %s logged in.", pw->pw_name);
#ifdef HASSETPROCTITLE
snprintf(proctitle, sizeof(proctitle),
"%s: %s", remotehost, pw->pw_name);
setproctitle(proctitle);
#endif /* HASSETPROCTITLE */
if (logging)
syslog(LOG_INFO, "FTP LOGIN FROM %s as %s",
remotehost, pw->pw_name);
}
(void) umask(curclass.umask);
return;
bad:
/* Forget all about it... */
end_login();
}
void
retrieve(cmd, name)
char *cmd, *name;
{
FILE *fin = NULL, *dout;
struct stat st;
int (*closefunc) __P((FILE *)) = NULL;
int log, sendrv, closerv, stderrfd, isconversion;
sendrv = closerv = stderrfd = -1;
isconversion = 0;
log = (cmd == 0);
if (cmd == NULL) {
fin = fopen(name, "r"), closefunc = fclose;
if (fin == NULL)
cmd = do_conversion(name);
if (cmd != NULL) {
isconversion++;
syslog(LOG_INFO, "get command: '%s'", cmd);
}
}
if (cmd != NULL) {
char line[BUFSIZ];
char temp[MAXPATHLEN + 1];
(void)snprintf(temp, sizeof(temp), "%s", TMPFILE);
stderrfd = mkstemp(temp);
if (stderrfd != -1)
(void)unlink(temp);
(void)snprintf(line, sizeof(line), cmd, name), name = line;
fin = ftpd_popen(line, "r", stderrfd), closefunc = ftpd_pclose;
st.st_size = -1;
st.st_blksize = BUFSIZ;
}
if (fin == NULL) {
if (errno != 0) {
perror_reply(550, name);
if (log) {
logcmd("get", -1, name, NULL);
}
}
if (stderrfd != -1)
(void)close(stderrfd);
return;
}
byte_count = -1;
if (cmd == NULL
&& (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) {
reply(550, "%s: not a plain file.", name);
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) {
perror_reply(550, name);
goto done;
}
if (c == '\n')
i++;
}
} else if (lseek(fileno(fin), restart_point, SEEK_SET) < 0) {
perror_reply(550, name);
goto done;
}
}
dout = dataconn(name, st.st_size, "w");
if (dout == NULL)
goto done;
sendrv = send_data(fin, dout, st.st_blksize);
(void) fclose(dout);
data = -1;
pdata = -1;
done:
if (log)
logcmd("get", byte_count, name, NULL);
closerv = (*closefunc)(fin);
if (sendrv == 0) {
FILE *err;
struct stat sb;
if (cmd != NULL && closerv != 0) {
lreply(226,
"Command returned an exit status of %d",
closerv);
if (isconversion)
syslog(LOG_INFO,
"get command: '%s' returned %d",
cmd, closerv);
}
if (cmd != NULL && stderrfd != -1 &&
(fstat(stderrfd, &sb) == 0) && sb.st_size > 0 &&
((err = fdopen(stderrfd, "r")) != NULL)) {
char *cp, line[LINE_MAX];
lreply(226, "Command error messages:");
rewind(err);
while (fgets(line, sizeof(line), err) != NULL) {
if ((cp = strchr(line, '\n')) != NULL)
*cp = '\0';
lreply(226, " %s", line);
}
(void) fflush(stdout);
(void) fclose(err);
lreply(226, "End of command error messages.");
/* a reply(226,) must follow */
}
reply(226, "Transfer complete.");
}
if (stderrfd != -1)
(void)close(stderrfd);
}
void
store(name, mode, unique)
char *name, *mode;
int unique;
{
FILE *fout, *din;
struct stat st;
int (*closefunc) __P((FILE *));
if (unique && stat(name, &st) == 0 &&
(name = gunique(name)) == NULL) {
logcmd(*mode == 'w' ? "put" : "append", -1, name, NULL);
return;
}
if (restart_point)
mode = "r+";
fout = fopen(name, mode);
closefunc = fclose;
if (fout == NULL) {
perror_reply(553, name);
logcmd(*mode == 'w' ? "put" : "append", -1, name, NULL);
return;
}
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) {
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) {
perror_reply(550, name);
goto done;
}
} else if (lseek(fileno(fout), restart_point, SEEK_SET) < 0) {
perror_reply(550, name);
goto done;
}
}
din = dataconn(name, (off_t)-1, "r");
if (din == NULL)
goto done;
if (receive_data(din, fout) == 0) {
if (unique)
reply(226, "Transfer complete (unique file name:%s).",
name);
else
reply(226, "Transfer complete.");
}
(void) fclose(din);
data = -1;
pdata = -1;
done:
logcmd(*mode == 'w' ? "put" : "append", byte_count, name, NULL);
(*closefunc)(fout);
}
static FILE *
getdatasock(mode)
char *mode;
{
int on = 1, s, t, tries;
if (data >= 0)
return (fdopen(data, mode));
(void) seteuid((uid_t)0);
s = socket(AF_INET, SOCK_STREAM, 0);
if (s < 0)
goto bad;
if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR,
(char *) &on, sizeof(on)) < 0)
goto bad;
/* anchor socket to avoid multi-homing problems */
data_source.sin_len = sizeof(struct sockaddr_in);
data_source.sin_family = AF_INET;
data_source.sin_addr = ctrl_addr.sin_addr;
for (tries = 1; ; tries++) {
if (bind(s, (struct sockaddr *)&data_source,
sizeof(data_source)) >= 0)
break;
if (errno != EADDRINUSE || tries > 10)
goto bad;
sleep(tries);
}
(void) seteuid((uid_t)pw->pw_uid);
#ifdef IP_TOS
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, mode));
bad:
/* Return the real value of errno (close may change it) */
t = errno;
(void) seteuid((uid_t)pw->pw_uid);
(void) close(s);
errno = t;
return (NULL);
}
static FILE *
dataconn(name, size, mode)
char *name;
off_t size;
char *mode;
{
char sizebuf[32];
FILE *file;
int retry = 0, tos;
file_size = size;
byte_count = 0;
if (size != (off_t) -1)
(void)snprintf(sizebuf, sizeof(sizebuf), " (%qd bytes)",
(long long)size);
else
sizebuf[0] = '\0';
if (pdata >= 0) {
struct sockaddr_in from;
int s, fromlen = sizeof(from);
(void) alarm(curclass.timeout);
s = accept(pdata, (struct sockaddr *)&from, &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;
#ifdef IP_TOS
tos = IPTOS_THROUGHPUT;
(void) setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&tos,
sizeof(int));
#endif
reply(150, "Opening %s mode data connection for '%s'%s.",
type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf);
return (fdopen(pdata, mode));
}
if (data >= 0) {
reply(125, "Using existing data connection for '%s'%s.",
name, sizebuf);
usedefault = 1;
return (fdopen(data, mode));
}
if (usedefault)
data_dest = his_addr;
usedefault = 1;
file = getdatasock(mode);
if (file == NULL) {
reply(425, "Can't create data socket (%s,%d): %s.",
inet_ntoa(data_source.sin_addr),
ntohs(data_source.sin_port), strerror(errno));
return (NULL);
}
data = fileno(file);
while (connect(data, (struct sockaddr *)&data_dest,
sizeof(data_dest)) < 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);
}
/*
* 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(instr, outstr, blksize)
FILE *instr, *outstr;
off_t blksize;
{
int c, cnt, filefd, netfd;
char *buf;
transflag++;
if (setjmp(urgcatch)) {
transflag = 0;
return (-1);
}
switch (type) {
case TYPE_A:
while ((c = getc(instr)) != EOF) {
byte_count++;
if (c == '\n') {
if (ferror(outstr))
goto data_err;
(void) putc('\r', outstr);
}
(void) putc(c, outstr);
}
fflush(outstr);
transflag = 0;
if (ferror(instr))
goto file_err;
if (ferror(outstr))
goto data_err;
return (0);
case TYPE_I:
case TYPE_L:
if ((buf = malloc((u_int)blksize)) == NULL) {
transflag = 0;
perror_reply(451, "Local resource failure: malloc");
return (-1);
}
netfd = fileno(outstr);
filefd = fileno(instr);
while ((cnt = read(filefd, buf, (u_int)blksize)) > 0 &&
write(netfd, buf, cnt) == cnt)
byte_count += cnt;
transflag = 0;
(void)free(buf);
if (cnt != 0) {
if (cnt < 0)
goto file_err;
goto data_err;
}
return (0);
default:
transflag = 0;
reply(550, "Unimplemented TYPE %d in send_data", type);
return (-1);
}
data_err:
transflag = 0;
perror_reply(426, "Data connection");
return (-1);
file_err:
transflag = 0;
perror_reply(551, "Error on input file");
return (-1);
}
/*
* 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(instr, outstr)
FILE *instr, *outstr;
{
int c, cnt, bare_lfs;
char buf[BUFSIZ];
#ifdef __GNUC__
(void) &bare_lfs;
#endif
bare_lfs = 0;
transflag++;
if (setjmp(urgcatch)) {
transflag = 0;
return (-1);
}
switch (type) {
case TYPE_I:
case TYPE_L:
while ((cnt = read(fileno(instr), buf, sizeof(buf))) > 0) {
if (write(fileno(outstr), buf, cnt) != cnt)
goto file_err;
byte_count += cnt;
}
if (cnt < 0)
goto data_err;
transflag = 0;
return (0);
case TYPE_E:
reply(553, "TYPE E not implemented.");
transflag = 0;
return (-1);
case TYPE_A:
while ((c = getc(instr)) != EOF) {
byte_count++;
if (c == '\n')
bare_lfs++;
while (c == '\r') {
if (ferror(outstr))
goto data_err;
if ((c = getc(instr)) != '\n') {
(void) putc ('\r', outstr);
if (c == '\0' || c == EOF)
goto contin2;
}
}
(void) putc(c, outstr);
contin2: ;
}
fflush(outstr);
if (ferror(instr))
goto data_err;
if (ferror(outstr))
goto file_err;
transflag = 0;
if (bare_lfs) {
lreply(226,
"WARNING! %d bare linefeeds received in ASCII mode",
bare_lfs);
(void)printf(" File may not have transferred correctly.\r\n");
}
return (0);
default:
reply(550, "Unimplemented TYPE %d in receive_data", type);
transflag = 0;
return (-1);
}
data_err:
transflag = 0;
perror_reply(426, "Data Connection");
return (-1);
file_err:
transflag = 0;
perror_reply(452, "Error writing file");
return (-1);
}
void
statfilecmd(filename)
char *filename;
{
FILE *fin;
int c;
char line[LINE_MAX];
(void)snprintf(line, sizeof(line), "/bin/ls -lgA %s", filename);
fin = ftpd_popen(line, "r", STDOUT_FILENO);
lreply(211, "status of %s:", filename);
while ((c = getc(fin)) != EOF) {
if (c == '\n') {
if (ferror(stdout)){
perror_reply(421, "control connection");
(void) ftpd_pclose(fin);
dologout(1);
/* NOTREACHED */
}
if (ferror(fin)) {
perror_reply(551, filename);
(void) ftpd_pclose(fin);
return;
}
(void) putc('\r', stdout);
}
(void) putc(c, stdout);
}
(void) ftpd_pclose(fin);
reply(211, "End of Status");
}
void
statcmd()
{
struct sockaddr_in *sin;
u_char *a, *p;
lreply(211, "%s FTP server status:", hostname);
lreply(211, "%s", version);
if (isdigit(remotehost[0]))
lreply(211, "Connected to %s", remotehost);
else
lreply(211, "Connected to %s (%s)", remotehost,
inet_ntoa(his_addr.sin_addr));
if (logged_in) {
if (guest)
lreply(211, "Logged in anonymously");
else
lreply(211, "Logged in as %s", pw->pw_name);
} else if (askpasswd)
lreply(211, "Waiting for password");
else
lreply(211, "Waiting for user name");
printf("211- TYPE: %s", typenames[type]);
if (type == TYPE_A || type == TYPE_E)
printf(", FORM: %s", formnames[form]);
if (type == TYPE_L)
#if NBBY == 8
printf(" %d", NBBY);
#else
printf(" %d", bytesize); /* need definition! */
#endif
printf("; STRUcture: %s; transfer MODE: %s\r\n",
strunames[stru], modenames[mode]);
if (data != -1)
lreply(211, "Data connection open");
else if (pdata != -1) {
printf("211- in Passive mode");
sin = &pasv_addr;
goto printaddr;
} else if (usedefault == 0) {
printf("211- PORT");
sin = &data_dest;
printaddr:
a = (u_char *) &sin->sin_addr;
p = (u_char *) &sin->sin_port;
#define UC(b) (((int) b) & 0xff)
printf(" (%d,%d,%d,%d,%d,%d)\r\n", UC(a[0]),
UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1]));
#undef UC
} else
lreply(211, "No data connection");
if (logged_in) {
struct ftpconv *cp;
lreply(211, "");
lreply(211, "Class: %s", curclass.classname);
lreply(211, "Check PORT commands: %sabled",
curclass.checkportcmd ? "en" : "dis");
if (curclass.display)
lreply(211, "Display file: %s", curclass.display);
if (curclass.notify)
lreply(211, "Notify fileglob: %s", curclass.notify);
lreply(211, "Idle timeout: %d, maximum timeout: %d",
curclass.timeout, curclass.maxtimeout);
lreply(211, "DELE, MKD, RMD, UMASK, CHMOD commands: %sabled",
curclass.modify ? "en" : "dis");
lreply(211, "Umask: %.04o", curclass.umask);
for (cp = curclass.conversions; cp != NULL; cp=cp->next) {
if (cp->suffix == NULL || cp->types == NULL ||
cp->command == NULL)
continue;
lreply(211,
"Conversion: %s [%s] disable: %s, command: %s",
cp->suffix, cp->types, cp->disable, cp->command);
}
}
reply(211, "End of status");
}
void
fatal(s)
char *s;
{
reply(451, "Error in server: %s\n", s);
reply(221, "Closing connection due to server error.");
dologout(0);
/* NOTREACHED */
}
void
#ifdef __STDC__
reply(int n, const char *fmt, ...)
#else
reply(n, fmt, va_alist)
int n;
char *fmt;
va_dcl
#endif
{
va_list ap;
#ifdef __STDC__
va_start(ap, fmt);
#else
va_start(ap);
#endif
(void)printf("%d ", n);
(void)vprintf(fmt, ap);
(void)printf("\r\n");
(void)fflush(stdout);
if (debug) {
syslog(LOG_DEBUG, "<--- %d ", n);
vsyslog(LOG_DEBUG, fmt, ap);
}
}
void
#ifdef __STDC__
lreply(int n, const char *fmt, ...)
#else
lreply(n, fmt, va_alist)
int n;
char *fmt;
va_dcl
#endif
{
va_list ap;
#ifdef __STDC__
va_start(ap, fmt);
#else
va_start(ap);
#endif
(void)printf("%d- ", n);
(void)vprintf(fmt, ap);
(void)printf("\r\n");
(void)fflush(stdout);
if (debug) {
syslog(LOG_DEBUG, "<--- %d- ", n);
vsyslog(LOG_DEBUG, fmt, ap);
}
}
static void
ack(s)
char *s;
{
reply(250, "%s command successful.", s);
}
void
delete(name)
char *name;
{
logcmd("delete", -1, name, NULL);
if (remove(name) < 0)
perror_reply(550, name);
else
ack("DELE");
}
void
cwd(path)
const char *path;
{
if (chdir(path) < 0)
perror_reply(550, path);
else {
show_chdir_messages(250);
ack("CWD");
}
}
static void
replydirname(name, message)
const char *name, *message;
{
char npath[MAXPATHLEN + 1];
int i;
for (i = 0; *name != '\0' && i < sizeof(npath) - 1; i++, name++) {
npath[i] = *name;
if (*name == '"')
npath[++i] = '"';
}
npath[i] = '\0';
reply(257, "\"%s\" %s", npath, message);
}
void
makedir(name)
char *name;
{
logcmd("mkdir", -1, name, NULL);
if (mkdir(name, 0777) < 0)
perror_reply(550, name);
else
replydirname(name, "directory created.");
}
void
removedir(name)
char *name;
{
logcmd("rmdir", -1, name, NULL);
if (rmdir(name) < 0)
perror_reply(550, name);
else
ack("RMD");
}
void
pwd()
{
char path[MAXPATHLEN + 1];
if (getcwd(path, sizeof(path) - 1) == NULL)
reply(550, "Can't get the current directory: %s.",
strerror(errno));
else
replydirname(path, "is the current directory.");
}
char *
renamefrom(name)
char *name;
{
struct stat st;
if (stat(name, &st) < 0) {
perror_reply(550, name);
return (NULL);
}
reply(350, "File exists, ready for destination name");
return (name);
}
void
renamecmd(from, to)
char *from, *to;
{
logcmd("rename", -1, from, to);
if (rename(from, to) < 0)
perror_reply(550, "rename");
else
ack("RNTO");
}
static void
dolog(sin)
struct sockaddr_in *sin;
{
struct hostent *hp = gethostbyaddr((char *)&sin->sin_addr,
sizeof(struct in_addr), AF_INET);
if (hp)
(void)strncpy(remotehost, hp->h_name, sizeof(remotehost));
else
(void)strncpy(remotehost, inet_ntoa(sin->sin_addr),
sizeof(remotehost));
remotehost[sizeof(remotehost) - 1] = '\0';
#ifdef HASSETPROCTITLE
snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost);
setproctitle(proctitle);
#endif /* HASSETPROCTITLE */
if (logging)
syslog(LOG_INFO, "connection from %s", remotehost);
}
/*
* Record logout in wtmp file
* and exit with supplied status.
*/
void
dologout(status)
int status;
{
/*
* Prevent reception of SIGURG from resulting in a resumption
* back to the main program loop.
*/
transflag = 0;
if (logged_in) {
(void) seteuid((uid_t)0);
logwtmp(ttyline, "", "");
#ifdef KERBEROS
if (!notickets && krbtkfile_env)
unlink(krbtkfile_env);
#endif
}
/* beware of flushing buffers after a SIGPIPE */
_exit(status);
}
static void
myoob(signo)
int signo;
{
char *cp;
/* only process if transfer occurring */
if (!transflag)
return;
cp = tmpline;
if (getline(cp, 7, stdin) == NULL) {
reply(221, "You could at least say goodbye.");
dologout(0);
}
if (strcasecmp(cp, "ABOR\r\n") == 0) {
tmpline[0] = '\0';
reply(426, "Transfer aborted. Data connection closed.");
reply(226, "Abort successful");
longjmp(urgcatch, 1);
}
if (strcasecmp(cp, "STAT\r\n") == 0) {
if (file_size != (off_t) -1)
reply(213, "Status: %qd of %qd bytes transferred",
byte_count, file_size);
else
reply(213, "Status: %qd bytes transferred", byte_count);
}
}
/*
* 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()
{
int len;
char *p, *a;
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;
pasv_addr.sin_port = 0;
(void) seteuid((uid_t)0);
if (bind(pdata, (struct sockaddr *)&pasv_addr, sizeof(pasv_addr)) < 0) {
(void) seteuid((uid_t)pw->pw_uid);
goto pasv_error;
}
(void) seteuid((uid_t)pw->pw_uid);
len = sizeof(pasv_addr);
if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0)
goto pasv_error;
if (listen(pdata, 1) < 0)
goto pasv_error;
a = (char *) &pasv_addr.sin_addr;
p = (char *) &pasv_addr.sin_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;
}
/*
* 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(local)
char *local;
{
static char new[MAXPATHLEN + 1];
struct stat st;
int count, len;
char *cp;
cp = strrchr(local, '/');
if (cp)
*cp = '\0';
if (stat(cp ? local : ".", &st) < 0) {
perror_reply(553, cp ? local : ".");
return (NULL);
}
if (cp)
*cp = '/';
(void) strcpy(new, local);
len = strlen(new);
cp = new + len;
*cp++ = '.';
for (count = 1; count < 100; count++) {
(void)snprintf(cp, sizeof(new) - len - 2, "%d", 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(code, string)
int code;
const char *string;
{
reply(code, "%s: %s.", string, strerror(errno));
}
static char *onefile[] = {
"",
0
};
void
send_file_list(whichf)
char *whichf;
{
struct stat st;
DIR *dirp = NULL;
struct dirent *dir;
FILE *dout = NULL;
char **dirlist, *dirname;
int simple = 0;
int freeglob = 0;
glob_t gl;
#ifdef __GNUC__
(void) &dout;
(void) &dirlist;
(void) &simple;
(void) &freeglob;
#endif
if (strpbrk(whichf, "~{[*?") != NULL) {
int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE;
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 {
onefile[0] = whichf;
dirlist = onefile;
simple = 1;
}
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.
*/
if (dirname[0] == '-' && *dirlist == NULL &&
transflag == 0) {
retrieve("/bin/ls %s", dirname);
goto out;
}
perror_reply(550, whichf);
if (dout != NULL) {
(void) fclose(dout);
transflag = 0;
data = -1;
pdata = -1;
}
goto out;
}
if (S_ISREG(st.st_mode)) {
if (dout == NULL) {
dout = dataconn("file list", (off_t)-1, "w");
if (dout == NULL)
goto out;
transflag++;
}
fprintf(dout, "%s%s\n", dirname,
type == TYPE_A ? "\r" : "");
byte_count += strlen(dirname) + 1;
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 + 1];
if (dir->d_name[0] == '.' && dir->d_namlen == 1)
continue;
if (dir->d_name[0] == '.' && dir->d_name[1] == '.' &&
dir->d_namlen == 2)
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.
*/
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++;
}
if (nbuf[0] == '.' && nbuf[1] == '/')
fprintf(dout, "%s%s\n", &nbuf[2],
type == TYPE_A ? "\r" : "");
else
fprintf(dout, "%s%s\n", nbuf,
type == TYPE_A ? "\r" : "");
byte_count += strlen(nbuf) + 1;
}
}
(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.");
transflag = 0;
if (dout != NULL)
(void) fclose(dout);
data = -1;
pdata = -1;
out:
if (freeglob) {
freeglob = 0;
globfree(&gl);
}
}
char *
conffilename(s)
const char *s;
{
static char filename[MAXPATHLEN + 1];
(void)snprintf(filename, sizeof(filename), "%s/%s", confdir ,s);
return filename;
}
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