File: [local] / src / libexec / ftpd / ftpd.c (download)
Revision 1.95, Sun Mar 18 17:20:13 2001 UTC (23 years, 2 months ago) by deraadt
Branch: MAIN
CVS Tags: OPENBSD_2_9_BASE, OPENBSD_2_9
Changes since 1.94: +4 -4 lines
use GLOB_LIMIT
|
/* $OpenBSD: ftpd.c,v 1.95 2001/03/18 17:20:13 deraadt Exp $ */
/* $NetBSD: ftpd.c,v 1.15 1995/06/03 22:46:47 mycroft Exp $ */
/*
* 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.
*/
/*
* 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.
*/
#ifndef lint
static char 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 8.4 (Berkeley) 4/16/94";
#else
static char rcsid[] = "$NetBSD: ftpd.c,v 1.15 1995/06/03 22:46:47 mycroft 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 <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/tcp.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 <glob.h>
#include <limits.h>
#include <login_cap.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 <vis.h>
#include <unistd.h>
#include <util.h>
#include <utmp.h>
#if defined(TCPWRAPPERS)
#include <tcpd.h>
#endif /* TCPWRAPPERS */
#if defined(SKEY)
#include <skey.h>
#endif
#include "pathnames.h"
#include "extern.h"
#ifdef __STDC__
#include <stdarg.h>
#else
#include <varargs.h>
#endif
static char version[] = "Version 6.5/OpenBSD";
extern off_t restart_point;
extern char cbuf[];
union sockunion server_addr;
union sockunion ctrl_addr;
union sockunion data_source;
union sockunion data_dest;
union sockunion his_addr;
union sockunion pasv_addr;
sigset_t allsigs;
int daemon_mode = 0;
int data;
jmp_buf errcatch, urgcatch;
int logged_in;
struct passwd *pw;
int debug = 0;
int timeout = 900; /* timeout after 15 minutes of inactivity */
int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */
int logging;
int high_data_ports = 0;
int anon_only = 0;
int multihome = 0;
int guest;
int stats;
int statfd = -1;
int portcheck = 1;
int dochroot;
int type;
int form;
int stru; /* avoid C keyword */
int mode;
int doutmp = 0; /* update utmp file */
int usedefault = 1; /* for data transfers */
int pdata = -1; /* for passive mode */
int family = AF_INET;
sig_atomic_t transflag;
off_t file_size;
off_t byte_count;
#if !defined(CMASK) || CMASK == 0
#undef CMASK
#define CMASK 022
#endif
int defumask = CMASK; /* default umask value */
int umaskchange = 1; /* allow user to change umask value. */
char tmpline[7];
char hostname[MAXHOSTNAMELEN];
char remotehost[MAXHOSTNAMELEN];
char dhostname[MAXHOSTNAMELEN];
char *guestpw;
static char ttyline[20];
char *tty = ttyline; /* for klogin */
static struct utmp utmp; /* for utmp */
static login_cap_t *lc;
#if defined(TCPWRAPPERS)
int allow_severity = LOG_INFO;
int deny_severity = LOG_NOTICE;
#endif /* TCPWRAPPERS */
#if defined(KERBEROS)
int notickets = 1;
char *krbtkfile_env = NULL;
#endif
char *ident = NULL;
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;
#ifdef HASSETPROCTITLE
char proctitle[BUFSIZ]; /* initial part of title */
#endif /* HASSETPROCTITLE */
#define LOGCMD(cmd, file) \
if (logging > 1) \
syslog(LOG_INFO,"%s %s%s", cmd, \
*(file) == '/' ? "" : curdir(), file);
#define LOGCMD2(cmd, file1, file2) \
if (logging > 1) \
syslog(LOG_INFO,"%s %s%s %s%s", cmd, \
*(file1) == '/' ? "" : curdir(), file1, \
*(file2) == '/' ? "" : curdir(), file2);
#define LOGBYTES(cmd, file, cnt) \
if (logging > 1) { \
if (cnt == (off_t)-1) \
syslog(LOG_INFO,"%s %s%s", cmd, \
*(file) == '/' ? "" : curdir(), file); \
else \
syslog(LOG_INFO, "%s %s%s = %qd bytes", \
cmd, (*(file) == '/') ? "" : curdir(), file, cnt); \
}
static void ack __P((char *));
static void myoob __P((int));
static int checkuser __P((char *, char *));
static FILE *dataconn __P((char *, off_t, char *));
static void dolog __P((struct sockaddr *));
static char *copy_dir __P((char *, struct passwd *));
static char *curdir __P((void));
static void end_login __P((void));
static FILE *getdatasock __P((char *));
static int guniquefd __P((char *, char **));
static void lostconn __P((int));
static void sigquit __P((int));
static int receive_data __P((FILE *, FILE *));
static void replydirname __P((const char *, const char *));
static void send_data __P((FILE *, FILE *, off_t, off_t, int));
static struct passwd *
sgetpwnam __P((char *));
static char *sgetsave __P((char *));
static void reapchild __P((int));
static int check_host __P((struct sockaddr *));
static void usage __P((void));
void logxfer __P((char *, off_t, time_t));
static char *
curdir()
{
static char path[MAXPATHLEN+1]; /* path + '/' */
if (getcwd(path, sizeof(path)-1) == NULL)
return ("");
if (path[1] != '\0') /* special case for root dir. */
strcat(path, "/");
/* For guest account, skip / since it's chrooted */
return (guest ? path+1 : path);
}
char *argstr = "AdDhlMSt:T:u:UvP46";
static void
usage()
{
syslog(LOG_ERR,
"usage: ftpd [-AdDhlMSUv] [-t timeout] [-T maxtimeout] [-u mask]");
exit(2);
}
int
main(argc, argv, envp)
int argc;
char *argv[];
char **envp;
{
int addrlen, ch, on = 1, tos;
char *cp, line[LINE_MAX];
FILE *fp;
struct hostent *hp;
tzset(); /* in case no timezone database in ~ftp */
sigfillset(&allsigs); /* used to block signals while root */
while ((ch = getopt(argc, argv, argstr)) != -1) {
switch (ch) {
case 'A':
anon_only = 1;
break;
case 'd':
debug = 1;
break;
case 'D':
daemon_mode = 1;
break;
case 'P':
portcheck = 0;
break;
case 'h':
high_data_ports = 1;
break;
case 'l':
logging++; /* > 1 == extra logging */
break;
case 'M':
multihome = 1;
break;
case 'S':
stats = 1;
break;
case 't':
timeout = atoi(optarg);
if (maxtimeout < timeout)
maxtimeout = timeout;
break;
case 'T':
maxtimeout = atoi(optarg);
if (timeout > maxtimeout)
timeout = maxtimeout;
break;
case 'u':
{
long val = 0;
char *p;
umaskchange = 0;
val = strtol(optarg, &p, 8);
if (*p != '\0' || val < 0 || (val & ~ACCESSPERMS)) {
syslog(LOG_ERR,
"ftpd: %s is a bad value for -u, aborting..",
optarg);
exit(2);
} else
defumask = val;
break;
}
case 'U':
doutmp = 1;
break;
case 'v':
debug = 1;
break;
case '4':
family = AF_INET;
break;
case '6':
family = AF_INET6;
break;
default:
usage();
break;
}
}
(void) freopen(_PATH_DEVNULL, "w", stderr);
/*
* 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);
if (daemon_mode) {
int ctl_sock, fd;
struct servent *sv;
/*
* Detach from parent.
*/
if (daemon(1, 1) < 0) {
syslog(LOG_ERR, "failed to become a daemon");
exit(1);
}
(void) signal(SIGCHLD, reapchild);
/*
* Get port number for ftp/tcp.
*/
sv = getservbyname("ftp", "tcp");
if (sv == NULL) {
syslog(LOG_ERR, "getservbyname for ftp failed");
exit(1);
}
/*
* Open a socket, bind it to the FTP port, and start
* listening.
*/
ctl_sock = socket(family, SOCK_STREAM, 0);
if (ctl_sock < 0) {
syslog(LOG_ERR, "control socket: %m");
exit(1);
}
if (setsockopt(ctl_sock, SOL_SOCKET, SO_REUSEADDR,
(char *)&on, sizeof(on)) < 0)
syslog(LOG_ERR, "control setsockopt: %m");
memset(&server_addr, 0, sizeof(server_addr));
server_addr.su_sin.sin_family = family;
switch (family) {
case AF_INET:
server_addr.su_len = sizeof(struct sockaddr_in);
server_addr.su_sin.sin_port = sv->s_port;
break;
case AF_INET6:
server_addr.su_len = sizeof(struct sockaddr_in6);
server_addr.su_sin6.sin6_port = sv->s_port;
break;
}
if (bind(ctl_sock, (struct sockaddr *)&server_addr,
server_addr.su_len)) {
syslog(LOG_ERR, "control bind: %m");
exit(1);
}
if (listen(ctl_sock, 32) < 0) {
syslog(LOG_ERR, "control listen: %m");
exit(1);
}
/* Stash pid in pidfile */
if ((fp = fopen(_PATH_FTPDPID, "w")) == NULL)
syslog(LOG_ERR, "can't open %s: %m", _PATH_FTPDPID);
else {
fprintf(fp, "%d\n", getpid());
fchmod(fileno(fp), S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
fclose(fp);
}
/*
* Loop forever accepting connection requests and forking off
* children to handle them.
*/
while (1) {
addrlen = sizeof(his_addr);
fd = accept(ctl_sock, (struct sockaddr *)&his_addr,
&addrlen);
if (fork() == 0) {
/* child */
(void) dup2(fd, 0);
(void) dup2(fd, 1);
close(ctl_sock);
break;
}
close(fd);
}
#if defined(TCPWRAPPERS)
/* ..in the child. */
if (!check_host((struct sockaddr *)&his_addr))
exit(1);
#endif /* TCPWRAPPERS */
} else {
addrlen = sizeof(his_addr);
if (getpeername(0, (struct sockaddr *)&his_addr,
&addrlen) < 0) {
/* syslog(LOG_ERR, "getpeername (%s): %m", argv[0]); */
exit(1);
}
}
/* set this here so klogin can use it... */
(void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid());
(void) signal(SIGHUP, sigquit);
(void) signal(SIGINT, sigquit);
(void) signal(SIGQUIT, sigquit);
(void) signal(SIGTERM, sigquit);
(void) signal(SIGPIPE, lostconn);
(void) signal(SIGCHLD, SIG_IGN);
if (signal(SIGURG, myoob) == SIG_ERR)
syslog(LOG_ERR, "signal: %m");
addrlen = sizeof(ctrl_addr);
if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) {
syslog(LOG_ERR, "getsockname (%s): %m", argv[0]);
exit(1);
}
if (his_addr.su_family == AF_INET6
&& IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr)) {
#if 1
/*
* IPv4 control connection arrived to AF_INET6 socket.
* I hate to do this, but this is the easiest solution.
*/
union sockunion 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_sin.sin_family = AF_INET;
his_addr.su_sin.sin_len = sizeof(his_addr.su_sin);
memcpy(&his_addr.su_sin.sin_addr,
&tmp_addr.su_sin6.sin6_addr.s6_addr[off],
sizeof(his_addr.su_sin.sin_addr));
his_addr.su_sin.sin_port = tmp_addr.su_sin6.sin6_port;
tmp_addr = ctrl_addr;
memset(&ctrl_addr, 0, sizeof(ctrl_addr));
ctrl_addr.su_sin.sin_family = AF_INET;
ctrl_addr.su_sin.sin_len = sizeof(ctrl_addr.su_sin);
memcpy(&ctrl_addr.su_sin.sin_addr,
&tmp_addr.su_sin6.sin6_addr.s6_addr[off],
sizeof(ctrl_addr.su_sin.sin_addr));
ctrl_addr.su_sin.sin_port = tmp_addr.su_sin6.sin6_port;
#else
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,
"Connection from IPv4 mapped address is not supported.");
exit(0);
#endif
}
#ifdef IP_TOS
if (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
data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1);
/* 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((struct sockaddr *)&his_addr);
/*
* Set up default state
*/
data = -1;
type = TYPE_A;
form = FORM_N;
stru = STRU_F;
mode = MODE_S;
tmpline[0] = '\0';
/* If logins are disabled, print out the message. */
if ((fp = fopen(_PATH_NOLOGIN, "r")) != NULL) {
while (fgets(line, sizeof(line), fp) != NULL) {
if ((cp = strchr(line, '\n')) != NULL)
*cp = '\0';
lreply(530, "%s", line);
}
(void) fflush(stdout);
(void) fclose(fp);
reply(530, "System not available.");
exit(0);
}
if ((fp = fopen(_PATH_FTPWELCOME, "r")) != NULL) {
while (fgets(line, sizeof(line), fp) != NULL) {
if ((cp = strchr(line, '\n')) != NULL)
*cp = '\0';
lreply(220, "%s", line);
}
(void) fflush(stdout);
(void) fclose(fp);
/* reply(220,) must follow */
}
(void) gethostname(hostname, sizeof(hostname));
/* Make sure hostname is fully qualified. */
hp = gethostbyname(hostname);
if (hp != NULL)
strcpy(hostname, hp->h_name);
if (multihome) {
getnameinfo((struct sockaddr *)&ctrl_addr, ctrl_addr.su_len,
dhostname, sizeof(dhostname), NULL, 0, 0);
}
reply(220, "%s FTP server (%s) ready.",
(multihome ? dhostname : hostname), version);
(void) setjmp(errcatch);
for (;;)
(void) yyparse();
/* NOTREACHED */
}
/*
* Signal handlers.
*/
static void
lostconn(signo)
int signo;
{
sigprocmask(SIG_BLOCK, &allsigs, NULL);
if (debug)
syslog(LOG_DEBUG, "lost connection");
dologout(1);
}
static void
sigquit(signo)
int signo;
{
sigprocmask(SIG_BLOCK, &allsigs, NULL);
syslog(LOG_ERR, "got signal %s", sys_signame[signo]);
dologout(1);
}
/*
* Helper function for sgetpwnam().
*/
static char *
sgetsave(s)
char *s;
{
char *new = malloc((unsigned) strlen(s) + 1);
if (new == NULL) {
perror_reply(421, "Local resource failure: malloc");
dologout(1);
/* NOTREACHED */
}
(void) strcpy(new, s);
return (new);
}
/*
* 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)
char *name;
{
static struct passwd save;
struct passwd *p;
if ((p = getpwnam(name)) == NULL)
return (p);
if (save.pw_name) {
free(save.pw_name);
memset(save.pw_passwd, 0, strlen(save.pw_passwd));
free(save.pw_passwd);
free(save.pw_class);
free(save.pw_gecos);
free(save.pw_dir);
free(save.pw_shell);
}
save = *p;
save.pw_name = sgetsave(p->pw_name);
save.pw_passwd = sgetsave(p->pw_passwd);
save.pw_class = sgetsave(p->pw_class);
save.pw_gecos = sgetsave(p->pw_gecos);
save.pw_dir = sgetsave(p->pw_dir);
save.pw_shell = sgetsave(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[MAXLOGNAME]; /* 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;
{
char *cp, *shell;
if (lc) {
login_close(lc);
lc = NULL;
}
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();
}
guest = 0;
if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) {
if (checkuser(_PATH_FTPUSERS, "ftp") ||
checkuser(_PATH_FTPUSERS, "anonymous"))
reply(530, "User %s access denied.", name);
else if ((pw = sgetpwnam("ftp")) != NULL) {
guest = 1;
askpasswd = 1;
lc = login_getclass(pw->pw_class);
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;
}
if (anon_only && !checkuser(_PATH_FTPCHROOT, name)) {
reply(530, "Sorry, only anonymous ftp allowed.");
return;
}
if ((pw = sgetpwnam(name))) {
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 || checkuser(_PATH_FTPUSERS, name)) {
reply(530, "User %s access denied.", name);
if (logging)
syslog(LOG_NOTICE,
"FTP LOGIN REFUSED FROM %s, %s",
remotehost, name);
pw = (struct passwd *) NULL;
return;
}
lc = login_getclass(pw->pw_class);
}
if (logging)
strlcpy(curname, name, sizeof(curname));
#ifdef SKEY
if (!skey_haskey(name)) {
char *myskey, *skey_keyinfo __P((char *name));
myskey = skey_keyinfo(name);
reply(331, "Password [ %s ] for %s required.",
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);
}
/*
* Check if a user is in the file "fname"
*/
static int
checkuser(fname, name)
char *fname;
char *name;
{
FILE *fp;
int found = 0;
char *p, line[BUFSIZ];
if ((fp = fopen(fname, "r")) != NULL) {
while (fgets(line, sizeof(line), fp) != NULL)
if ((p = strchr(line, '\n')) != NULL) {
*p = '\0';
if (line[0] == '#')
continue;
if (strcmp(line, name) == 0) {
found = 1;
break;
}
}
(void) fclose(fp);
}
return (found);
}
/*
* Terminate login as previous user, if any, resetting state;
* used when USER command is given or login fails.
*/
static void
end_login()
{
sigprocmask (SIG_BLOCK, &allsigs, NULL);
(void) seteuid((uid_t)0);
if (logged_in) {
ftpdlogwtmp(ttyline, "", "");
if (doutmp)
logout(utmp.ut_line);
}
pw = NULL;
/* umask is restored in ftpcmd.y */
setusercontext(NULL, getpwuid(0), (uid_t)0,
LOGIN_SETPRIORITY|LOGIN_SETRESOURCES);
logged_in = 0;
guest = 0;
dochroot = 0;
}
void
pass(passwd)
char *passwd;
{
int rval, flags;
FILE *fp;
static char homedir[MAXPATHLEN];
char *dir, rootdir[MAXPATHLEN];
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) {
useconds_t us;
/* Sleep between 1 and 3 seconds to emulate a crypt. */
us = arc4random() % 3000000;
usleep(us);
rval = 1; /* failure below */
goto skip;
}
#if defined(KERBEROS)
rval = klogin(pw, "", hostname, passwd);
if (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
/* the strcmp does not catch null passwords! */
if (strcmp(crypt(passwd, pw->pw_passwd), pw->pw_passwd) ||
*pw->pw_passwd == '\0') {
rval = 1; /* failure */
goto skip;
}
rval = 0;
skip:
/*
* If rval == 1, the user failed the authentication check
* above. If rval == 0, either Kerberos or local authentication
* succeeded.
*/
if (rval) {
reply(530, "Login incorrect.");
if (logging)
syslog(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;
}
} else {
/* Save anonymous' password. */
guestpw = strdup(passwd);
if (guestpw == (char *)NULL)
fatal("Out of memory");
}
login_attempts = 0; /* this time successful */
if (setegid((gid_t)pw->pw_gid) < 0) {
reply(550, "Can't set gid.");
return;
}
/* set umask via setusercontext() unless -u flag was given. */
flags = LOGIN_SETGROUP|LOGIN_SETPRIORITY|LOGIN_SETRESOURCES;
if (umaskchange)
flags |= LOGIN_SETUMASK;
else
(void) umask(defumask);
setusercontext(lc, pw, (uid_t)0, flags);
/* open wtmp before chroot */
ftpdlogwtmp(ttyline, pw->pw_name, remotehost);
/* open utmp before chroot */
if (doutmp) {
memset((void *)&utmp, 0, sizeof(utmp));
(void)time(&utmp.ut_time);
(void)strncpy(utmp.ut_name, pw->pw_name, sizeof(utmp.ut_name));
(void)strncpy(utmp.ut_host, remotehost, sizeof(utmp.ut_host));
(void)strncpy(utmp.ut_line, ttyline, sizeof(utmp.ut_line));
login(&utmp);
}
/* open stats file before chroot */
if (guest && (stats == 1) && (statfd < 0))
if ((statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND)) < 0)
stats = 0;
logged_in = 1;
dochroot = login_getcapbool(lc, "ftp-chroot", 0) ||
checkuser(_PATH_FTPCHROOT, pw->pw_name);
if ((dir = login_getcapstr(lc, "ftp-dir", NULL, NULL))) {
char *newdir;
newdir = copy_dir(dir, pw);
if (newdir == NULL) {
perror_reply(421, "Local resource failure: malloc");
dologout(1);
/* NOTREACHED */
}
free(pw->pw_dir);
pw->pw_dir = newdir;
}
if (guest || dochroot) {
if (multihome && guest) {
struct stat ts;
/* Compute root directory. */
snprintf(rootdir, sizeof(rootdir), "%s/%s",
pw->pw_dir, dhostname);
if (stat(rootdir, &ts) < 0) {
snprintf(rootdir, sizeof(rootdir), "%s/%s",
pw->pw_dir, hostname);
}
} else
strcpy(rootdir, pw->pw_dir);
}
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(rootdir) < 0 || chdir("/") < 0) {
reply(550, "Can't set guest privileges.");
goto bad;
}
strcpy(pw->pw_dir, "/");
if (setenv("HOME", "/", 1) == -1) {
reply(550, "Can't setup environment.");
goto bad;
}
} else if (dochroot) {
if (chroot(rootdir) < 0 || chdir("/") < 0) {
reply(550, "Can't change root.");
goto bad;
}
strcpy(pw->pw_dir, "/");
if (setenv("HOME", "/", 1) == -1) {
reply(550, "Can't setup environment.");
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=/");
}
if (seteuid((uid_t)pw->pw_uid) < 0) {
reply(550, "Can't set uid.");
goto bad;
}
sigprocmask(SIG_UNBLOCK, &allsigs, NULL);
/*
* Set home directory so that use of ~ (tilde) works correctly.
*/
if (getcwd(homedir, MAXPATHLEN) != NULL) {
if (setenv("HOME", homedir, 1) == -1) {
reply(550, "Can't setup environment.");
goto bad;
}
}
/*
* Display a login message, if it exists.
* N.B. reply(230,) must follow the message.
*/
if ((fp = fopen(_PATH_FTPLOGINMESG, "r")) != NULL) {
char *cp, line[LINE_MAX];
while (fgets(line, sizeof(line), fp) != NULL) {
if ((cp = strchr(line, '\n')) != NULL)
*cp = '\0';
lreply(230, "%s", line);
}
(void) fflush(stdout);
(void) fclose(fp);
}
if (guest) {
if (ident != NULL)
free(ident);
ident = strdup(passwd);
if (ident == NULL)
fatal("Ran out of memory.");
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("%s", 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("%s", proctitle);
#endif /* HASSETPROCTITLE */
if (logging)
syslog(LOG_INFO, "FTP LOGIN FROM %s as %s",
remotehost, pw->pw_name);
}
login_close(lc);
lc = NULL;
return;
bad:
/* Forget all about it... */
login_close(lc);
lc = NULL;
end_login();
}
void
retrieve(cmd, name)
char *cmd, *name;
{
FILE *fin, *dout;
struct stat st;
int (*closefunc) __P((FILE *));
time_t start;
if (cmd == 0) {
fin = fopen(name, "r"), closefunc = fclose;
st.st_size = 0;
} else {
char line[BUFSIZ];
(void) snprintf(line, sizeof(line), cmd, name);
name = line;
fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose;
st.st_size = -1;
st.st_blksize = BUFSIZ;
}
if (fin == NULL) {
if (errno != 0) {
perror_reply(550, name);
if (cmd == 0) {
LOGCMD("get", name);
}
}
return;
}
byte_count = -1;
if (cmd == 0 && (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, n;
int c;
n = restart_point;
i = 0;
while (i++ < n) {
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;
time(&start);
send_data(fin, dout, st.st_blksize, st.st_size,
(restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode)));
if ((cmd == 0) && stats)
logxfer(name, byte_count, start);
(void) fclose(dout);
data = -1;
done:
if (pdata >= 0)
(void) close(pdata);
pdata = -1;
if (cmd == 0)
LOGBYTES("get", name, byte_count);
(*closefunc)(fin);
}
void
store(name, mode, unique)
char *name, *mode;
int unique;
{
FILE *fout, *din;
int (*closefunc) __P((FILE *));
struct stat st;
int fd;
if (restart_point && *mode != 'a')
mode = "r+";
if (unique && stat(name, &st) == 0) {
char *nam;
fd = guniquefd(name, &nam);
if (fd == -1) {
LOGCMD(*mode == 'w' ? "put" : "append", name);
return;
}
name = nam;
fout = fdopen(fd, mode);
} else
fout = fopen(name, mode);
closefunc = fclose;
if (fout == NULL) {
perror_reply(553, name);
LOGCMD(*mode == 'w' ? "put" : "append", name);
return;
}
byte_count = -1;
if (restart_point) {
if (type == TYPE_A) {
off_t i, n;
int c;
n = restart_point;
i = 0;
while (i++ < n) {
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:
LOGBYTES(*mode == 'w' ? "put" : "append", name, byte_count);
(*closefunc)(fout);
}
static FILE *
getdatasock(mode)
char *mode;
{
int on = 1, s, t, tries;
if (data >= 0)
return (fdopen(data, mode));
sigprocmask (SIG_BLOCK, &allsigs, NULL);
(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;
/* anchor socket to avoid multi-homing problems */
data_source = ctrl_addr;
data_source.su_port = htons(20); /* ftp-data port */
for (tries = 1; ; tries++) {
if (bind(s, (struct sockaddr *)&data_source,
data_source.su_len) >= 0)
break;
if (errno != EADDRINUSE || tries > 10)
goto bad;
sleep(tries);
}
(void) seteuid((uid_t)pw->pw_uid);
sigprocmask (SIG_UNBLOCK, &allsigs, NULL);
#ifdef IP_TOS
if (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
#ifdef TCP_NOPUSH
/*
* Turn off push flag to keep sender TCP from sending short packets
* at the boundaries of each write(). Should probably do a SO_SNDBUF
* to set the send buffer size as well, but that may not be desirable
* in heavy-load situations.
*/
on = 1;
if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, (char *)&on, sizeof on) < 0)
syslog(LOG_WARNING, "setsockopt (TCP_NOPUSH): %m");
#endif
#ifdef SO_SNDBUF
on = 65536;
if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, (char *)&on, sizeof on) < 0)
syslog(LOG_WARNING, "setsockopt (SO_SNDBUF): %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);
sigprocmask (SIG_UNBLOCK, &allsigs, NULL);
(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;
in_port_t *p;
char *fa, *ha;
int alen;
file_size = size;
byte_count = 0;
if (size != (off_t) -1) {
(void) snprintf(sizebuf, sizeof(sizebuf), " (%qd bytes)",
size);
} else
sizebuf[0] = '\0';
if (pdata >= 0) {
union sockunion from;
int s, fromlen = sizeof(from);
signal (SIGALRM, toolong);
(void) alarm ((unsigned) 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);
}
switch (from.su_family) {
case AF_INET:
p = (in_port_t *)&from.su_sin.sin_port;
fa = (u_char *)&from.su_sin.sin_addr;
ha = (u_char *)&his_addr.su_sin.sin_addr;
alen = sizeof(struct in_addr);
break;
case AF_INET6:
p = (in_port_t *)&from.su_sin6.sin6_port;
fa = (u_char *)&from.su_sin6.sin6_addr;
ha = (u_char *)&his_addr.su_sin6.sin6_addr;
alen = sizeof(struct in6_addr);
break;
default:
perror_reply(425, "Can't build data connection");
(void) close(pdata);
(void) close(s);
pdata = -1;
return (NULL);
}
if (from.su_family != his_addr.su_family ||
ntohs(*p) < IPPORT_RESERVED) {
perror_reply(425, "Can't build data connection");
(void) close(pdata);
(void) close(s);
pdata = -1;
return (NULL);
}
if (portcheck && memcmp(fa, ha, alen) != 0) {
perror_reply(435, "Can't build data connection");
(void) close(pdata);
(void) close(s);
pdata = -1;
return (NULL);
}
(void) close(pdata);
pdata = s;
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) {
char hbuf[MAXHOSTNAMELEN], pbuf[10];
getnameinfo((struct sockaddr *)&data_source, data_source.su_len,
hbuf, sizeof(hbuf), pbuf, sizeof(pbuf),
NI_NUMERICHOST | NI_NUMERICSERV);
reply(425, "Can't create data socket (%s,%s): %s.",
hbuf, pbuf, strerror(errno));
return (NULL);
}
data = fileno(file);
/*
* attempt to connect to reserved port on client machine;
* this looks like an attack
*/
switch (data_dest.su_family) {
case AF_INET:
p = (in_port_t *)&data_dest.su_sin.sin_port;
fa = (u_char *)&data_dest.su_sin.sin_addr;
ha = (u_char *)&his_addr.su_sin.sin_addr;
alen = sizeof(struct in_addr);
break;
case AF_INET6:
p = (in_port_t *)&data_dest.su_sin6.sin6_port;
fa = (u_char *)&data_dest.su_sin6.sin6_addr;
ha = (u_char *)&his_addr.su_sin6.sin6_addr;
alen = sizeof(struct in6_addr);
break;
default:
perror_reply(425, "Can't build data connection");
(void) fclose(file);
pdata = -1;
return (NULL);
}
if (data_dest.su_family != his_addr.su_family ||
ntohs(*p) < IPPORT_RESERVED || ntohs(*p) == 2049) { /* XXX */
perror_reply(425, "Can't build data connection");
(void) fclose(file);
data = -1;
return NULL;
}
if (portcheck && memcmp(fa, ha, alen) != 0) {
perror_reply(435, "Can't build data connection");
(void) fclose(file);
data = -1;
return NULL;
}
while (connect(data, (struct sockaddr *)&data_dest,
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);
}
/*
* 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 void
send_data(instr, outstr, blksize, filesize, isreg)
FILE *instr, *outstr;
off_t blksize;
off_t filesize;
int isreg;
{
int c, cnt, filefd, netfd;
char *buf, *bp;
size_t len;
transflag++;
if (setjmp(urgcatch)) {
transflag = 0;
return;
}
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;
reply(226, "Transfer complete.");
return;
case TYPE_I:
case TYPE_L:
/*
* isreg is only set if we are not doing restart and we
* are sending a regular file
*/
netfd = fileno(outstr);
filefd = fileno(instr);
if (isreg && filesize < (off_t)16 * 1024 * 1024) {
buf = mmap(0, filesize, PROT_READ, MAP_SHARED, filefd,
(off_t)0);
if (!buf) {
syslog(LOG_WARNING, "mmap(%lu): %m",
(unsigned long)filesize);
goto oldway;
}
bp = buf;
len = filesize;
do {
cnt = write(netfd, bp, len);
len -= cnt;
bp += cnt;
if (cnt > 0) byte_count += cnt;
} while(cnt > 0 && len > 0);
transflag = 0;
munmap(buf, (size_t)filesize);
if (cnt < 0)
goto data_err;
reply(226, "Transfer complete.");
return;
}
oldway:
if ((buf = malloc((u_int)blksize)) == NULL) {
transflag = 0;
perror_reply(451, "Local resource failure: malloc");
return;
}
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;
}
reply(226, "Transfer complete.");
return;
default:
transflag = 0;
reply(550, "Unimplemented TYPE %d in send_data", type);
return;
}
data_err:
transflag = 0;
perror_reply(426, "Data connection");
return;
file_err:
transflag = 0;
perror_reply(551, "Error on input file");
}
/*
* 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;
int cnt, bare_lfs = 0;
char buf[BUFSIZ];
transflag++;
if (setjmp(urgcatch)) {
transflag = 0;
return (-1);
}
switch (type) {
case TYPE_I:
case TYPE_L:
signal (SIGALRM, lostconn);
do {
(void) alarm ((unsigned) timeout);
cnt = read(fileno(instr), buf, sizeof(buf));
(void) alarm (0);
if (cnt > 0) {
if (write(fileno(outstr), buf, cnt) != cnt)
goto file_err;
byte_count += cnt;
}
} while (cnt > 0);
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);
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;
int atstart;
char line[LINE_MAX];
(void)snprintf(line, sizeof(line), "/bin/ls -lgA %s", filename);
fin = ftpd_popen(line, "r");
lreply(211, "status of %s:", filename);
atstart = 1;
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);
}
if (atstart && isdigit(c))
(void) putc(' ', stdout);
(void) putc(c, stdout);
atstart = (c == '\n');
}
(void) ftpd_pclose(fin);
reply(211, "End of Status");
}
void
statcmd()
{
union sockunion *su;
u_char *a, *p;
char hbuf[MAXHOSTNAMELEN];
int ispassive;
lreply(211, "%s FTP server status:", hostname, version);
printf(" %s\r\n", version);
getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len,
hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST);
printf(" Connected to %s", remotehost);
if (strcmp(remotehost, hbuf) != 0)
printf(" (%s)", hbuf);
printf("\r\n");
if (logged_in) {
if (guest)
printf(" Logged in anonymously\r\n");
else
printf(" Logged in as %s\r\n", pw->pw_name);
} else if (askpasswd)
printf(" Waiting for password\r\n");
else
printf(" Waiting for user name\r\n");
printf(" 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]);
ispassive = 0;
if (data != -1)
printf(" Data connection open\r\n");
else if (pdata != -1) {
printf(" in Passive mode\r\n");
su = (union sockunion *)&pasv_addr;
ispassive++;
goto printaddr;
} else if (usedefault == 0) {
su = (union sockunion *)&data_dest;
printaddr:
/* PASV/PORT */
if (su->su_family == AF_INET) {
if (ispassive)
printf("211- PASV ");
else
printf("211- PORT ");
a = (u_char *) &su->su_sin.sin_addr;
p = (u_char *) &su->su_sin.sin_port;
printf("(%u,%u,%u,%u,%u,%u)\r\n",
a[0], a[1], a[2], a[3],
p[0], p[1]);
}
/* LPSV/LPRT */
{
int alen, af, i;
alen = 0;
switch (su->su_family) {
case AF_INET:
a = (u_char *) &su->su_sin.sin_addr;
p = (u_char *) &su->su_sin.sin_port;
alen = sizeof(su->su_sin.sin_addr);
af = 4;
break;
case AF_INET6:
a = (u_char *) &su->su_sin6.sin6_addr;
p = (u_char *) &su->su_sin6.sin6_port;
alen = sizeof(su->su_sin6.sin6_addr);
af = 6;
break;
default:
af = 0;
break;
}
if (af) {
if (ispassive)
printf("211- LPSV ");
else
printf("211- LPRT ");
printf("(%u,%u", af, alen);
for (i = 0; i < alen; i++)
printf(",%u", a[i]);
printf(",%u,%u,%u)\r\n", 2, p[0], p[1]);
}
}
/* EPRT/EPSV */
epsvonly:
{
u_char af;
switch (su->su_family) {
case AF_INET:
af = 1;
break;
case AF_INET6:
af = 2;
break;
default:
af = 0;
break;
}
if (af) {
char hbuf[MAXHOSTNAMELEN], pbuf[10];
if (getnameinfo((struct sockaddr *)su, su->su_len,
hbuf, sizeof(hbuf), pbuf, sizeof(pbuf),
NI_NUMERICHOST) == 0) {
if (ispassive)
printf("211- EPSV ");
else
printf("211- EPRT ");
printf("(|%u|%s|%s|)\r\n",
af, hbuf, pbuf);
}
}
}
} else
printf(" No data connection\r\n");
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
nack(s)
char *s;
{
reply(502, "%s command not implemented.", s);
}
/* ARGSUSED */
void
yyerror(s)
char *s;
{
char *cp;
if ((cp = strchr(cbuf,'\n')))
*cp = '\0';
reply(500, "'%s': command not understood.", cbuf);
}
void
delete(name)
char *name;
{
struct stat st;
LOGCMD("delete", name);
if (stat(name, &st) < 0) {
perror_reply(550, name);
return;
}
if ((st.st_mode&S_IFMT) == S_IFDIR) {
if (rmdir(name) < 0) {
perror_reply(550, name);
return;
}
goto done;
}
if (unlink(name) < 0) {
perror_reply(550, name);
return;
}
done:
ack("DELE");
}
void
cwd(path)
char *path;
{
FILE *message;
if (chdir(path) < 0)
perror_reply(550, path);
else {
if ((message = fopen(_PATH_CWDMESG, "r")) != NULL) {
char *cp, line[LINE_MAX];
while (fgets(line, sizeof(line), message) != NULL) {
if ((cp = strchr(line, '\n')) != NULL)
*cp = '\0';
lreply(250, "%s", line);
}
(void) fflush(stdout);
(void) fclose(message);
}
ack("CWD");
}
}
void
replydirname(name, message)
const char *name, *message;
{
char *p, *ep;
char npath[MAXPATHLEN * 2];
p = npath;
ep = &npath[sizeof(npath) - 1];
while (*name) {
if (*name == '"') {
if (ep - p < 2)
break;
*p++ = *name++;
*p++ = '"';
} else {
if (ep - p < 1)
break;
*p++ = *name++;
}
}
*p = '\0';
reply(257, "\"%s\" %s", npath, message);
}
void
makedir(name)
char *name;
{
LOGCMD("mkdir", name);
if (mkdir(name, 0777) < 0)
perror_reply(550, name);
else
replydirname(name, "directory created.");
}
void
removedir(name)
char *name;
{
LOGCMD("rmdir", name);
if (rmdir(name) < 0)
perror_reply(550, name);
else
ack("RMD");
}
void
pwd()
{
char path[MAXPATHLEN];
if (getcwd(path, sizeof path) == (char *)NULL)
reply(550, "Can't get current directory: %s.", strerror(errno));
else
replydirname(path, "is current directory.");
}
char *
renamefrom(name)
char *name;
{
struct stat st;
if (stat(name, &st) < 0) {
perror_reply(550, name);
return ((char *)0);
}
reply(350, "File exists, ready for destination name");
return (name);
}
void
renamecmd(from, to)
char *from, *to;
{
LOGCMD2("rename", from, to);
if (rename(from, to) < 0)
perror_reply(550, "rename");
else
ack("RNTO");
}
static void
dolog(sa)
struct sockaddr *sa;
{
char hbuf[sizeof(remotehost)];
getnameinfo(sa, sa->sa_len, hbuf, sizeof(hbuf), NULL, 0, 0);
(void) strlcpy(remotehost, hbuf, sizeof(remotehost));
#ifdef HASSETPROCTITLE
snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost);
setproctitle("%s", 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;
{
transflag = 0;
if (logged_in) {
sigprocmask(SIG_BLOCK, &allsigs, NULL);
(void) seteuid((uid_t)0);
ftpdlogwtmp(ttyline, "", "");
if (doutmp)
logout(utmp.ut_line);
#if defined(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;
int save_errno = errno;
/* 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);
}
upper(cp);
if (strcmp(cp, "ABOR\r\n") == 0) {
tmpline[0] = '\0';
reply(426, "Transfer aborted. Data connection closed.");
reply(226, "Abort successful");
longjmp(urgcatch, 1);
}
if (strcmp(cp, "STAT\r\n") == 0) {
tmpline[0] = '\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);
}
errno = save_errno;
}
/*
* 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, on;
u_char *p, *a;
if (pw == NULL) {
reply(530, "Please login with USER and PASS");
return;
}
if (pdata >= 0)
close(pdata);
/*
* XXX
* At this point, it would be nice to have an algorithm that
* inserted a growing delay in an attack scenario. Such a thing
* would look like continual passive sockets being opened, but
* nothing serious being done with them. They're not used to
* move data; the entire attempt is just to use tcp FIN_WAIT
* resources.
*/
pdata = socket(AF_INET, SOCK_STREAM, 0);
if (pdata < 0) {
perror_reply(425, "Can't open passive connection");
return;
}
#ifdef IP_PORTRANGE
on = high_data_ports ? IP_PORTRANGE_HIGH : IP_PORTRANGE_DEFAULT;
if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE,
(char *)&on, sizeof(on)) < 0)
goto pasv_error;
#endif
pasv_addr = ctrl_addr;
pasv_addr.su_sin.sin_port = 0;
if (bind(pdata, (struct sockaddr *)&pasv_addr,
pasv_addr.su_len) < 0)
goto pasv_error;
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 = (u_char *) &pasv_addr.su_sin.sin_addr;
p = (u_char *) &pasv_addr.su_sin.sin_port;
reply(227, "Entering Passive Mode (%u,%u,%u,%u,%u,%u)", a[0],
a[1], a[2], a[3], p[0], p[1]);
return;
pasv_error:
(void) seteuid((uid_t)pw->pw_uid);
(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, on;
register u_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);
/*
* XXX
* At this point, it would be nice to have an algorithm that
* inserted a growing delay in an attack scenario. Such a thing
* would look like continual passive sockets being opened, but
* nothing serious being done with them. They not used to move
* data; the entire attempt is just to use tcp FIN_WAIT
* resources.
*/
pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0);
if (pdata < 0) {
perror_reply(425, "Can't open passive connection");
return;
}
switch (ctrl_addr.su_family) {
case AF_INET:
#ifdef IP_PORTRANGE
on = high_data_ports ? IP_PORTRANGE_HIGH : IP_PORTRANGE_DEFAULT;
if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE,
(char *)&on, sizeof(on)) < 0)
goto pasv_error;
#endif
break;
case AF_INET6:
#ifdef IPV6_PORTRANGE
on = high_data_ports ? IPV6_PORTRANGE_HIGH
: IPV6_PORTRANGE_DEFAULT;
if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE,
(char *)&on, sizeof(on)) < 0)
goto pasv_error;
#endif
break;
}
pasv_addr = ctrl_addr;
pasv_addr.su_port = 0;
(void) seteuid((uid_t) 0);
if (bind(pdata, (struct sockaddr *) &pasv_addr, pasv_addr.su_len) < 0) {
(void) seteuid((uid_t) pw->pw_uid);
goto pasv_error;
}
(void) seteuid((uid_t) pw->pw_uid);
len = pasv_addr.su_len;
if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0)
goto pasv_error;
if (listen(pdata, 1) < 0)
goto pasv_error;
p = (u_char *) &pasv_addr.su_port;
if (strcmp(cmd, "LPSV") == 0) {
switch (pasv_addr.su_family) {
case AF_INET:
a = (u_char *) &pasv_addr.su_sin.sin_addr;
reply(228,
"Entering Long Passive Mode (%u,%u,%u,%u,%u,%u,%u,%u,%u)",
4, 4, a[0], a[1], a[2], a[3], 2, p[0], p[1]);
return;
case AF_INET6:
a = (char *) &pasv_addr.su_sin6.sin6_addr;
reply(228,
"Entering Long Passive Mode (%u,%u,%u,%u,%u,%u,"
"%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u,%u)",
6, 16, a[0], a[1], a[2], a[3], a[4],
a[5], a[6], a[7], a[8], a[9], a[10],
a[11], a[12], a[13], a[14], a[15],
2, p[0], p[1]);
return;
}
} else if (strcmp(cmd, "EPSV") == 0) {
switch (pasv_addr.su_family) {
case AF_INET:
case AF_INET6:
reply(229, "Entering Extended Passive Mode (|||%u|)",
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;
}
/*
* EPRT |proto|addr|port|
*/
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;
if (epsvall) {
reply(501, "EPRT disallowed after EPSV ALL");
return -1;
}
usedefault = 0;
if (pdata >= 0) {
(void) close(pdata);
pdata = -1;
}
tmp = strdup(arg);
if (!tmp) {
fatal("not enough core.");
/*NOTREACHED*/
}
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 check */
p = NULL;
(void)strtoul(result[2], &p, 10);
if (!*result[2] || *p)
goto protounsupp;
p = NULL;
proto = strtoul(result[0], &p, 10);
if (!*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; /*no DNS*/
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, res->ai_addr, res->ai_addrlen);
if (his_addr.su_family == AF_INET6 &&
data_dest.su_family == AF_INET6) {
/* XXX more sanity checks! */
data_dest.su_sin6.sin6_scope_id =
his_addr.su_sin6.sin6_scope_id;
}
if (pdata >= 0) {
(void) close(pdata);
pdata = -1;
}
reply(200, "EPRT command successful.");
if (tmp)
free(tmp);
if (res)
freeaddrinfo(res);
return 0;
parsefail:
reply(500, "Invalid argument, rejected.");
usedefault = 1;
if (tmp)
free(tmp);
if (res)
freeaddrinfo(res);
return -1;
protounsupp:
epsv_protounsupp("Protocol not supported");
usedefault = 1;
if (tmp)
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.
*/
static int
guniquefd(local, nam)
char *local;
char **nam;
{
static char new[MAXPATHLEN];
struct stat st;
int count, len, fd;
char *cp;
cp = strrchr(local, '/');
if (cp)
*cp = '\0';
if (stat(cp ? local : ".", &st) < 0) {
perror_reply(553, cp ? local : ".");
return (-1);
}
if (cp)
*cp = '/';
(void) strlcpy(new, local, sizeof(new));
len = strlen(new);
if (len+2+1 >= sizeof(new)-1)
return (-1);
cp = new + len;
*cp++ = '.';
for (count = 1; count < 100; count++) {
(void)snprintf(cp, sizeof(new) - (cp - new), "%d", count);
fd = open(new, O_RDWR|O_CREAT|O_EXCL, 0666);
if (fd == -1)
continue;
if (nam)
*nam = new;
return (fd);
}
reply(452, "Unique file name cannot be created.");
return (-1);
}
/*
* Format and send reply containing system error number.
*/
void
perror_reply(code, string)
int code;
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;
if (strpbrk(whichf, "~{[*?") != NULL) {
memset(&gl, 0, sizeof(gl));
freeglob = 1;
if (glob(whichf,
GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE|GLOB_LIMIT,
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++)) {
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 ((dirp = opendir(dirname)) == NULL)
continue;
while ((dir = readdir(dirp)) != NULL) {
char nbuf[MAXPATHLEN];
if (dir->d_name[0] == '.' && dir->d_namlen == 1)
continue;
if (dir->d_name[0] == '.' && dir->d_name[1] == '.' &&
dir->d_namlen == 2)
continue;
snprintf(nbuf, sizeof(nbuf), "%s/%s", dirname,
dir->d_name);
/*
* We have to do a stat to insure 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);
else {
if (pdata >= 0)
close(pdata);
}
data = -1;
pdata = -1;
out:
if (freeglob) {
freeglob = 0;
globfree(&gl);
}
}
static void
reapchild(signo)
int signo;
{
int save_errno = errno;
while (wait3(NULL, WNOHANG, NULL) > 0)
;
errno = save_errno;
}
void
logxfer(name, size, start)
char *name;
off_t size;
time_t start;
{
char buf[400 + MAXHOSTNAMELEN*4 + MAXPATHLEN*4];
char dir[MAXPATHLEN], path[MAXPATHLEN], rpath[MAXPATHLEN];
char vremotehost[MAXHOSTNAMELEN*4], vpath[MAXPATHLEN*4];
char *vpw;
time_t now;
if ((statfd >= 0) && (getcwd(dir, sizeof(dir)) != NULL)) {
time(&now);
vpw = (char *)malloc(strlen((guest) ? guestpw : pw->pw_name)*4+1);
if (vpw == NULL)
return;
snprintf(path, sizeof path, "%s/%s", dir, name);
if (realpath(path, rpath) == NULL)
strlcpy(rpath, path, sizeof rpath);
strvis(vpath, rpath, VIS_SAFE|VIS_NOSLASH);
strvis(vremotehost, remotehost, VIS_SAFE|VIS_NOSLASH);
strvis(vpw, (guest) ? guestpw : pw->pw_name, VIS_SAFE|VIS_NOSLASH);
snprintf(buf, sizeof(buf),
"%.24s %d %s %qd %s %c %s %c %c %s ftp %d %s %s\n",
ctime(&now), now - start + (now == start),
vremotehost, (long long) size, vpath,
((type == TYPE_A) ? 'a' : 'b'), "*" /* none yet */,
'o', ((guest) ? 'a' : 'r'),
vpw, 0 /* none yet */,
((guest) ? "*" : pw->pw_name), dhostname);
write(statfd, buf, strlen(buf));
free(vpw);
}
}
#if defined(TCPWRAPPERS)
static int
check_host(sa)
struct sockaddr *sa;
{
struct sockaddr_in *sin;
struct hostent *hp;
char *addr;
if (sa->sa_family != AF_INET)
return 1; /*XXX*/
sin = (struct sockaddr_in *)sa;
hp = gethostbyaddr((char *)&sin->sin_addr,
sizeof(struct in_addr), AF_INET);
addr = inet_ntoa(sin->sin_addr);
if (hp) {
if (!hosts_ctl("ftpd", hp->h_name, addr, STRING_UNKNOWN)) {
syslog(LOG_NOTICE, "tcpwrappers rejected: %s [%s]",
hp->h_name, addr);
return (0);
}
} else {
if (!hosts_ctl("ftpd", STRING_UNKNOWN, addr, STRING_UNKNOWN)) {
syslog(LOG_NOTICE, "tcpwrappers rejected: [%s]", addr);
return (0);
}
}
return (1);
}
#endif /* TCPWRAPPERS */
/*
* Allocate space and return a copy of the specified dir.
* If 'dir' begins with a tilde (~), expand it.
*/
char *
copy_dir(dir, pw)
char *dir;
struct passwd *pw;
{
char *cp;
char *newdir;
char *user = NULL;
size_t dirsiz;
/* Nothing to expand */
if (dir[0] != '~')
return (strdup(dir));
/* "dir" is of form ~user/some/dir, lookup user. */
if (dir[1] != '/' && dir[1] != '\0') {
if ((cp = strchr(dir + 1, '/')) == NULL)
cp = dir + strlen(dir);
if ((user = malloc(cp - dir)) == NULL)
return (NULL);
strlcpy(user, dir + 1, cp - dir);
/* Only do lookup if it is a different user. */
if (strcmp(user, pw->pw_name) != 0) {
if ((pw = getpwnam(user)) == NULL) {
/* No such user, interpret literally */
free(user);
return(strdup(dir));
}
}
}
/*
* If there is no directory separator (/) then it is just pw_dir.
* Otherwise, replace ~foo with pw_dir.
*/
if ((cp = strchr(dir + 1, '/')) == NULL) {
newdir = strdup(pw->pw_dir);
} else {
dirsiz = strlen(cp) + strlen(pw->pw_dir) + 1;
if ((newdir = malloc(dirsiz)) == NULL)
return (NULL);
strcpy(newdir, pw->pw_dir);
strcat(newdir, cp);
}
if (user)
free(user);
return(newdir);
}
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