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8ea01c0922
freebsd-skq/libexec/ftpd/ftpd.c
yar e7b22678a4 Add some consistency checks to the signal-related code. 
MFC:	along with rev. 1.202
2005-02-16 11:35:51 +00:00

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/*
* 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.
*/
#if 0
#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 */
#endif
#ifndef lint
#if 0
static char sccsid[] = "@(#)ftpd.c 8.4 (Berkeley) 4/16/94";
#endif
#endif /* not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* FTP server.
*/
#include <sys/param.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/wait.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 <netdb.h>
#include <pwd.h>
#include <grp.h>
#include <opie.h>
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <time.h>
#include <unistd.h>
#include <libutil.h>
#ifdef LOGIN_CAP
#include <login_cap.h>
#endif
#ifdef USE_PAM
#include <security/pam_appl.h>
#endif
#include "pathnames.h"
#include "extern.h"
#include <stdarg.h>
static char version[] = "Version 6.00LS";
#undef main
extern off_t restart_point;
extern char cbuf[];
union sockunion ctrl_addr;
union sockunion data_source;
union sockunion data_dest;
union sockunion his_addr;
union sockunion pasv_addr;
int daemon_mode;
int data;
int dataport;
int hostinfo = 1; /* print host-specific info in messages */
int logged_in;
struct passwd *pw;
char *homedir;
int ftpdebug;
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 restricted_data_ports = 1;
int paranoid = 1; /* be extra careful about security */
int anon_only = 0; /* Only anonymous ftp allowed */
int guest;
int dochroot;
char *chrootdir;
int dowtmp = 1;
int stats;
int statfd = -1;
int type;
int form;
int stru; /* avoid C keyword */
int mode;
int usedefault = 1; /* for data transfers */
int pdata = -1; /* for passive mode */
int readonly = 0; /* Server is in readonly mode. */
int noepsv = 0; /* EPSV command is disabled. */
int noretr = 0; /* RETR command is disabled. */
int noguestretr = 0; /* RETR command is disabled for anon users. */
int noguestmkd = 0; /* MKD command is disabled for anon users. */
int noguestmod = 1; /* anon users may not modify existing files. */
off_t file_size;
off_t byte_count;
#if !defined(CMASK) || CMASK == 0
#undef CMASK
#define CMASK 027
#endif
int defumask = CMASK; /* default umask value */
char tmpline[7];
char *hostname;
int epsvall = 0;
#ifdef VIRTUAL_HOSTING
char *ftpuser;
static struct ftphost {
struct ftphost *next;
struct addrinfo *hostinfo;
char *hostname;
char *anonuser;
char *statfile;
char *welcome;
char *loginmsg;
} *thishost, *firsthost;
#endif
char remotehost[NI_MAXHOST];
char *ident = NULL;
static char ttyline[20];
char *tty = ttyline; /* for klogin */
#ifdef USE_PAM
static int auth_pam(struct passwd**, const char*);
pam_handle_t *pamh = NULL;
#endif
static struct opie opiedata;
static char opieprompt[OPIE_CHALLENGE_MAX+1];
static int pwok;
char *pid_file = NULL;
/*
* Limit number of pathnames that glob can return.
* A limit of 0 indicates the number of pathnames is unlimited.
*/
#define MAXGLOBARGS 16384
#
/*
* 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 SETPROCTITLE
#ifdef OLD_SETPROCTITLE
char **Argv = NULL; /* pointer to argument vector */
char *LastArgv = NULL; /* end of argv */
#endif /* OLD_SETPROCTITLE */
char proctitle[LINE_MAX]; /* initial part of title */
#endif /* SETPROCTITLE */
#define LOGCMD(cmd, file) logcmd((cmd), (file), NULL, -1)
#define LOGCMD2(cmd, file1, file2) logcmd((cmd), (file1), (file2), -1)
#define LOGBYTES(cmd, file, cnt) logcmd((cmd), (file), NULL, (cnt))
static volatile sig_atomic_t recvurg;
static int transflag; /* NB: for debugging only */
#define STARTXFER flagxfer(1)
#define ENDXFER flagxfer(0)
#define START_UNSAFE maskurg(1)
#define END_UNSAFE maskurg(0)
/* It's OK to put an `else' clause after this macro. */
#define CHECKOOB(action) \
if (recvurg) { \
recvurg = 0; \
if (myoob()) { \
ENDXFER; \
action; \
} \
}
#ifdef VIRTUAL_HOSTING
static void inithosts(void);
static void selecthost(union sockunion *);
#endif
static void ack(char *);
static void sigurg(int);
static void maskurg(int);
static void flagxfer(int);
static int myoob(void);
static int checkuser(char *, char *, int, char **);
static FILE *dataconn(char *, off_t, char *);
static void dolog(struct sockaddr *);
static void end_login(void);
static FILE *getdatasock(char *);
static int guniquefd(char *, char **);
static void lostconn(int);
static void sigquit(int);
static int receive_data(FILE *, FILE *);
static int send_data(FILE *, FILE *, size_t, off_t, int);
static struct passwd *
sgetpwnam(char *);
static char *sgetsave(char *);
static void reapchild(int);
static void appendf(char **, char *, ...) __printflike(2, 3);
static void logcmd(char *, char *, char *, off_t);
static void logxfer(char *, off_t, time_t);
static char *doublequote(char *);
static int *socksetup(int, char *, const char *);
int
main(int argc, char *argv[], char **envp)
{
socklen_t addrlen;
int ch, on = 1, tos;
char *cp, line[LINE_MAX];
FILE *fd;
char *bindname = NULL;
const char *bindport = "ftp";
int family = AF_UNSPEC;
struct sigaction sa;
tzset(); /* in case no timezone database in ~ftp */
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_RESTART;
#ifdef OLD_SETPROCTITLE
/*
* Save start and extent of argv for setproctitle.
*/
Argv = argv;
while (*envp)
envp++;
LastArgv = envp[-1] + strlen(envp[-1]);
#endif /* OLD_SETPROCTITLE */
/*
* Prevent diagnostic messages from appearing on stderr.
* We run as a daemon or from inetd; in both cases, there's
* more reason in logging to syslog.
*/
(void) freopen(_PATH_DEVNULL, "w", stderr);
opterr = 0;
/*
* LOG_NDELAY sets up the logging connection immediately,
* necessary for anonymous ftp's that chroot and can't do it later.
*/
openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP);
while ((ch = getopt(argc, argv,
"46a:AdDEhlmMoOp:P:rRSt:T:u:UvW")) != -1) {
switch (ch) {
case '4':
family = (family == AF_INET6) ? AF_UNSPEC : AF_INET;
break;
case '6':
family = (family == AF_INET) ? AF_UNSPEC : AF_INET6;
break;
case 'a':
bindname = optarg;
break;
case 'A':
anon_only = 1;
break;
case 'd':
ftpdebug++;
break;
case 'D':
daemon_mode++;
break;
case 'E':
noepsv = 1;
break;
case 'h':
hostinfo = 0;
break;
case 'l':
logging++; /* > 1 == extra logging */
break;
case 'm':
noguestmod = 0;
break;
case 'M':
noguestmkd = 1;
break;
case 'o':
noretr = 1;
break;
case 'O':
noguestretr = 1;
break;
case 'p':
pid_file = optarg;
break;
case 'P':
bindport = optarg;
break;
case 'r':
readonly = 1;
break;
case 'R':
paranoid = 0;
break;
case 'S':
stats++;
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;
val = strtol(optarg, &optarg, 8);
if (*optarg != '\0' || val < 0)
syslog(LOG_WARNING, "bad value for -u");
else
defumask = val;
break;
}
case 'U':
restricted_data_ports = 0;
break;
case 'v':
ftpdebug++;
break;
case 'W':
dowtmp = 0;
break;
default:
syslog(LOG_WARNING, "unknown flag -%c ignored", optopt);
break;
}
}
#ifdef VIRTUAL_HOSTING
inithosts();
#endif
if (daemon_mode) {
int *ctl_sock, fd, maxfd = -1, nfds, i;
fd_set defreadfds, readfds;
pid_t pid;
/*
* Detach from parent.
*/
if (daemon(1, 1) < 0) {
syslog(LOG_ERR, "failed to become a daemon");
exit(1);
}
sa.sa_handler = reapchild;
(void)sigaction(SIGCHLD, &sa, NULL);
/*
* Open a socket, bind it to the FTP port, and start
* listening.
*/
ctl_sock = socksetup(family, bindname, bindport);
if (ctl_sock == NULL)
exit(1);
FD_ZERO(&defreadfds);
for (i = 1; i <= *ctl_sock; i++) {
FD_SET(ctl_sock[i], &defreadfds);
if (listen(ctl_sock[i], 32) < 0) {
syslog(LOG_ERR, "control listen: %m");
exit(1);
}
if (maxfd < ctl_sock[i])
maxfd = ctl_sock[i];
}
/*
* Atomically write process ID
*/
if (pid_file)
{
int fd;
char buf[20];
fd = open(pid_file, O_CREAT | O_WRONLY | O_TRUNC
| O_NONBLOCK | O_EXLOCK, 0644);
if (fd < 0) {
if (errno == EAGAIN)
syslog(LOG_ERR,
"%s: already locked", pid_file);
else
syslog(LOG_ERR, "%s: %m", pid_file);
exit(1);
}
snprintf(buf, sizeof(buf),
"%lu\n", (unsigned long) getpid());
if (write(fd, buf, strlen(buf)) < 0) {
syslog(LOG_ERR, "%s: write: %m", pid_file);
exit(1);
}
/* Leave the pid file open and locked */
}
/*
* Loop forever accepting connection requests and forking off
* children to handle them.
*/
while (1) {
FD_COPY(&defreadfds, &readfds);
nfds = select(maxfd + 1, &readfds, NULL, NULL, 0);
if (nfds <= 0) {
if (nfds < 0 && errno != EINTR)
syslog(LOG_WARNING, "select: %m");
continue;
}
pid = -1;
for (i = 1; i <= *ctl_sock; i++)
if (FD_ISSET(ctl_sock[i], &readfds)) {
addrlen = sizeof(his_addr);
fd = accept(ctl_sock[i],
(struct sockaddr *)&his_addr,
&addrlen);
if (fd >= 0) {
if ((pid = fork()) == 0) {
/* child */
(void) dup2(fd, 0);
(void) dup2(fd, 1);
close(ctl_sock[i]);
} else
close(fd);
}
}
if (pid == 0)
break;
}
} else {
addrlen = sizeof(his_addr);
if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) {
syslog(LOG_ERR, "getpeername (%s): %m",argv[0]);
exit(1);
}
}
sa.sa_handler = SIG_DFL;
(void)sigaction(SIGCHLD, &sa, NULL);
sa.sa_handler = sigurg;
sa.sa_flags = 0; /* don't restart syscalls for SIGURG */
(void)sigaction(SIGURG, &sa, NULL);
sigfillset(&sa.sa_mask); /* block all signals in handler */
sa.sa_flags = SA_RESTART;
sa.sa_handler = sigquit;
(void)sigaction(SIGHUP, &sa, NULL);
(void)sigaction(SIGINT, &sa, NULL);
(void)sigaction(SIGQUIT, &sa, NULL);
(void)sigaction(SIGTERM, &sa, NULL);
sa.sa_handler = lostconn;
(void)sigaction(SIGPIPE, &sa, NULL);
addrlen = sizeof(ctrl_addr);
if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) {
syslog(LOG_ERR, "getsockname (%s): %m",argv[0]);
exit(1);
}
dataport = ntohs(ctrl_addr.su_port) - 1; /* as per RFC 959 */
#ifdef VIRTUAL_HOSTING
/* select our identity from virtual host table */
selecthost(&ctrl_addr);
#endif
#ifdef IP_TOS
if (ctrl_addr.su_family == AF_INET)
{
tos = IPTOS_LOWDELAY;
if (setsockopt(0, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0)
syslog(LOG_WARNING, "control setsockopt (IP_TOS): %m");
}
#endif
/*
* Disable Nagle on the control channel so that we don't have to wait
* for peer's ACK before issuing our next reply.
*/
if (setsockopt(0, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0)
syslog(LOG_WARNING, "control setsockopt (TCP_NODELAY): %m");
data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1);
/* set this here so klogin can use it... */
(void)snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid());
/* Try to handle urgent data inline */
#ifdef SO_OOBINLINE
if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)) < 0)
syslog(LOG_WARNING, "control setsockopt (SO_OOBINLINE): %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 ((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);
}
#ifdef VIRTUAL_HOSTING
fd = fopen(thishost->welcome, "r");
#else
fd = fopen(_PATH_FTPWELCOME, "r");
#endif
if (fd != 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 */
}
#ifndef VIRTUAL_HOSTING
if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL)
fatalerror("Ran out of memory.");
if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0)
hostname[0] = '\0';
hostname[MAXHOSTNAMELEN - 1] = '\0';
#endif
if (hostinfo)
reply(220, "%s FTP server (%s) ready.", hostname, version);
else
reply(220, "FTP server ready.");
for (;;)
(void) yyparse();
/* NOTREACHED */
}
static void
lostconn(int signo)
{
if (ftpdebug)
syslog(LOG_DEBUG, "lost connection");
dologout(1);
}
static void
sigquit(int signo)
{
syslog(LOG_ERR, "got signal %d", signo);
dologout(1);
}
#ifdef VIRTUAL_HOSTING
/*
* read in virtual host tables (if they exist)
*/
static void
inithosts(void)
{
int insert;
size_t len;
FILE *fp;
char *cp, *mp, *line;
char *hostname;
char *vhost, *anonuser, *statfile, *welcome, *loginmsg;
struct ftphost *hrp, *lhrp;
struct addrinfo hints, *res, *ai;
/*
* Fill in the default host information
*/
if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL)
fatalerror("Ran out of memory.");
if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0)
hostname[0] = '\0';
hostname[MAXHOSTNAMELEN - 1] = '\0';
if ((hrp = malloc(sizeof(struct ftphost))) == NULL)
fatalerror("Ran out of memory.");
hrp->hostname = hostname;
hrp->hostinfo = NULL;
memset(&hints, 0, sizeof(hints));
hints.ai_flags = AI_CANONNAME;
hints.ai_family = AF_UNSPEC;
if (getaddrinfo(hrp->hostname, NULL, &hints, &res) == 0)
hrp->hostinfo = res;
hrp->statfile = _PATH_FTPDSTATFILE;
hrp->welcome = _PATH_FTPWELCOME;
hrp->loginmsg = _PATH_FTPLOGINMESG;
hrp->anonuser = "ftp";
hrp->next = NULL;
thishost = firsthost = lhrp = hrp;
if ((fp = fopen(_PATH_FTPHOSTS, "r")) != NULL) {
int addrsize, gothost;
void *addr;
struct hostent *hp;
while ((line = fgetln(fp, &len)) != NULL) {
int i, hp_error;
/* skip comments */
if (line[0] == '#')
continue;
if (line[len - 1] == '\n') {
line[len - 1] = '\0';
mp = NULL;
} else {
if ((mp = malloc(len + 1)) == NULL)
fatalerror("Ran out of memory.");
memcpy(mp, line, len);
mp[len] = '\0';
line = mp;
}
cp = strtok(line, " \t");
/* skip empty lines */
if (cp == NULL)
goto nextline;
vhost = cp;
/* set defaults */
anonuser = "ftp";
statfile = _PATH_FTPDSTATFILE;
welcome = _PATH_FTPWELCOME;
loginmsg = _PATH_FTPLOGINMESG;
/*
* Preparse the line so we can use its info
* for all the addresses associated with
* the virtual host name.
* Field 0, the virtual host name, is special:
* it's already parsed off and will be strdup'ed
* later, after we know its canonical form.
*/
for (i = 1; i < 5 && (cp = strtok(NULL, " \t")); i++)
if (*cp != '-' && (cp = strdup(cp)))
switch (i) {
case 1: /* anon user permissions */
anonuser = cp;
break;
case 2: /* statistics file */
statfile = cp;
break;
case 3: /* welcome message */
welcome = cp;
break;
case 4: /* login message */
loginmsg = cp;
break;
default: /* programming error */
abort();
/* NOTREACHED */
}
hints.ai_flags = 0;
hints.ai_family = AF_UNSPEC;
hints.ai_flags = AI_PASSIVE;
if (getaddrinfo(vhost, NULL, &hints, &res) != 0)
goto nextline;
for (ai = res; ai != NULL && ai->ai_addr != NULL;
ai = ai->ai_next) {
gothost = 0;
for (hrp = firsthost; hrp != NULL; hrp = hrp->next) {
struct addrinfo *hi;
for (hi = hrp->hostinfo; hi != NULL;
hi = hi->ai_next)
if (hi->ai_addrlen == ai->ai_addrlen &&
memcmp(hi->ai_addr,
ai->ai_addr,
ai->ai_addr->sa_len) == 0) {
gothost++;
break;
}
if (gothost)
break;
}
if (hrp == NULL) {
if ((hrp = malloc(sizeof(struct ftphost))) == NULL)
goto nextline;
hrp->hostname = NULL;
insert = 1;
} else {
if (hrp->hostinfo && hrp->hostinfo != res)
freeaddrinfo(hrp->hostinfo);
insert = 0; /* host already in the chain */
}
hrp->hostinfo = res;
/*
* determine hostname to use.
* force defined name if there is a valid alias
* otherwise fallback to primary hostname
*/
/* XXX: getaddrinfo() can't do alias check */
switch(hrp->hostinfo->ai_family) {
case AF_INET:
addr = &((struct sockaddr_in *)hrp->hostinfo->ai_addr)->sin_addr;
addrsize = sizeof(struct in_addr);
break;
case AF_INET6:
addr = &((struct sockaddr_in6 *)hrp->hostinfo->ai_addr)->sin6_addr;
addrsize = sizeof(struct in6_addr);
break;
default:
/* should not reach here */
freeaddrinfo(hrp->hostinfo);
if (insert)
free(hrp); /*not in chain, can free*/
else
hrp->hostinfo = NULL; /*mark as blank*/
goto nextline;
/* NOTREACHED */
}
if ((hp = getipnodebyaddr(addr, addrsize,
hrp->hostinfo->ai_family,
&hp_error)) != NULL) {
if (strcmp(vhost, hp->h_name) != 0) {
if (hp->h_aliases == NULL)
vhost = hp->h_name;
else {
i = 0;
while (hp->h_aliases[i] &&
strcmp(vhost, hp->h_aliases[i]) != 0)
++i;
if (hp->h_aliases[i] == NULL)
vhost = hp->h_name;
}
}
}
if (hrp->hostname &&
strcmp(hrp->hostname, vhost) != 0) {
free(hrp->hostname);
hrp->hostname = NULL;
}
if (hrp->hostname == NULL &&
(hrp->hostname = strdup(vhost)) == NULL) {
freeaddrinfo(hrp->hostinfo);
hrp->hostinfo = NULL; /* mark as blank */
if (hp)
freehostent(hp);
goto nextline;
}
hrp->anonuser = anonuser;
hrp->statfile = statfile;
hrp->welcome = welcome;
hrp->loginmsg = loginmsg;
if (insert) {
hrp->next = NULL;
lhrp->next = hrp;
lhrp = hrp;
}
if (hp)
freehostent(hp);
}
nextline:
if (mp)
free(mp);
}
(void) fclose(fp);
}
}
static void
selecthost(union sockunion *su)
{
struct ftphost *hrp;
u_int16_t port;
#ifdef INET6
struct in6_addr *mapped_in6 = NULL;
#endif
struct addrinfo *hi;
#ifdef INET6
/*
* XXX IPv4 mapped IPv6 addr consideraton,
* specified in rfc2373.
*/
if (su->su_family == AF_INET6 &&
IN6_IS_ADDR_V4MAPPED(&su->su_sin6.sin6_addr))
mapped_in6 = &su->su_sin6.sin6_addr;
#endif
hrp = thishost = firsthost; /* default */
port = su->su_port;
su->su_port = 0;
while (hrp != NULL) {
for (hi = hrp->hostinfo; hi != NULL; hi = hi->ai_next) {
if (memcmp(su, hi->ai_addr, hi->ai_addrlen) == 0) {
thishost = hrp;
goto found;
}
#ifdef INET6
/* XXX IPv4 mapped IPv6 addr consideraton */
if (hi->ai_addr->sa_family == AF_INET && mapped_in6 != NULL &&
(memcmp(&mapped_in6->s6_addr[12],
&((struct sockaddr_in *)hi->ai_addr)->sin_addr,
sizeof(struct in_addr)) == 0)) {
thishost = hrp;
goto found;
}
#endif
}
hrp = hrp->next;
}
found:
su->su_port = port;
/* setup static variables as appropriate */
hostname = thishost->hostname;
ftpuser = thishost->anonuser;
}
#endif
/*
* Helper function for sgetpwnam().
*/
static char *
sgetsave(char *s)
{
char *new = malloc(strlen(s) + 1);
if (new == NULL) {
reply(421, "Ran out of memory.");
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).
* NB: The data returned by sgetpwnam() will remain valid until
* the next call to this function. Its difference from getpwnam()
* is that sgetpwnam() is known to be called from ftpd code only.
*/
static struct passwd *
sgetpwnam(char *name)
{
static struct passwd save;
struct passwd *p;
if ((p = getpwnam(name)) == NULL)
return (p);
if (save.pw_name) {
free(save.pw_name);
free(save.pw_passwd);
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_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(char *name)
{
char *cp, *shell;
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;
#ifdef VIRTUAL_HOSTING
pw = sgetpwnam(thishost->anonuser);
#else
pw = sgetpwnam("ftp");
#endif
if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) {
if (checkuser(_PATH_FTPUSERS, "ftp", 0, NULL) ||
checkuser(_PATH_FTPUSERS, "anonymous", 0, NULL))
reply(530, "User %s access denied.", name);
else if (pw != NULL) {
guest = 1;
askpasswd = 1;
reply(331,
"Guest login ok, send your email address 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 != 0) {
reply(530, "Sorry, only anonymous ftp allowed.");
return;
}
if ((pw = sgetpwnam(name))) {
if ((shell = pw->pw_shell) == NULL || *shell == 0)
shell = _PATH_BSHELL;
setusershell();
while ((cp = getusershell()) != NULL)
if (strcmp(cp, shell) == 0)
break;
endusershell();
if (cp == NULL || checkuser(_PATH_FTPUSERS, name, 1, NULL)) {
reply(530, "User %s access denied.", name);
if (logging)
syslog(LOG_NOTICE,
"FTP LOGIN REFUSED FROM %s, %s",
remotehost, name);
pw = NULL;
return;
}
}
if (logging)
strncpy(curname, name, sizeof(curname)-1);
pwok = 0;
#ifdef USE_PAM
/* XXX Kluge! The conversation mechanism needs to be fixed. */
#endif
if (opiechallenge(&opiedata, name, opieprompt) == 0) {
pwok = (pw != NULL) &&
opieaccessfile(remotehost) &&
opiealways(pw->pw_dir);
reply(331, "Response to %s %s for %s.",
opieprompt, pwok ? "requested" : "required", name);
} else {
pwok = 1;
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(login_attempts);
}
/*
* Check if a user is in the file "fname",
* return a pointer to a malloc'd string with the rest
* of the matching line in "residue" if not NULL.
*/
static int
checkuser(char *fname, char *name, int pwset, char **residue)
{
FILE *fd;
int found = 0;
size_t len;
char *line, *mp, *p;
if ((fd = fopen(fname, "r")) != NULL) {
while (!found && (line = fgetln(fd, &len)) != NULL) {
/* skip comments */
if (line[0] == '#')
continue;
if (line[len - 1] == '\n') {
line[len - 1] = '\0';
mp = NULL;
} else {
if ((mp = malloc(len + 1)) == NULL)
fatalerror("Ran out of memory.");
memcpy(mp, line, len);
mp[len] = '\0';
line = mp;
}
/* avoid possible leading and trailing whitespace */
p = strtok(line, " \t");
/* skip empty lines */
if (p == NULL)
goto nextline;
/*
* if first chr is '@', check group membership
*/
if (p[0] == '@') {
int i = 0;
struct group *grp;
if (p[1] == '\0') /* single @ matches anyone */
found = 1;
else {
if ((grp = getgrnam(p+1)) == NULL)
goto nextline;
/*
* Check user's default group
*/
if (pwset && grp->gr_gid == pw->pw_gid)
found = 1;
/*
* Check supplementary groups
*/
while (!found && grp->gr_mem[i])
found = strcmp(name,
grp->gr_mem[i++])
== 0;
}
}
/*
* Otherwise, just check for username match
*/
else
found = strcmp(p, name) == 0;
/*
* Save the rest of line to "residue" if matched
*/
if (found && residue) {
if ((p = strtok(NULL, "")) != NULL)
p += strspn(p, " \t");
if (p && *p) {
if ((*residue = strdup(p)) == NULL)
fatalerror("Ran out of memory.");
} else
*residue = NULL;
}
nextline:
if (mp)
free(mp);
}
(void) fclose(fd);
}
return (found);
}
/*
* Terminate login as previous user, if any, resetting state;
* used when USER command is given or login fails.
*/
static void
end_login(void)
{
#ifdef USE_PAM
int e;
#endif
(void) seteuid(0);
if (logged_in && dowtmp)
ftpd_logwtmp(ttyline, "", NULL);
pw = NULL;
#ifdef LOGIN_CAP
setusercontext(NULL, getpwuid(0), 0,
LOGIN_SETPRIORITY|LOGIN_SETRESOURCES|LOGIN_SETUMASK|
LOGIN_SETMAC);
#endif
#ifdef USE_PAM
if (pamh) {
if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS)
syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e));
if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS)
syslog(LOG_ERR, "pam_close_session: %s", pam_strerror(pamh, e));
if ((e = pam_end(pamh, e)) != PAM_SUCCESS)
syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e));
pamh = NULL;
}
#endif
logged_in = 0;
guest = 0;
dochroot = 0;
}
#ifdef USE_PAM
/*
* the following code is stolen from imap-uw PAM authentication module and
* login.c
*/
#define COPY_STRING(s) (s ? strdup(s) : NULL)
struct cred_t {
const char *uname; /* user name */
const char *pass; /* password */
};
typedef struct cred_t cred_t;
static int
auth_conv(int num_msg, const struct pam_message **msg,
struct pam_response **resp, void *appdata)
{
int i;
cred_t *cred = (cred_t *) appdata;
struct pam_response *reply;
reply = calloc(num_msg, sizeof *reply);
if (reply == NULL)
return PAM_BUF_ERR;
for (i = 0; i < num_msg; i++) {
switch (msg[i]->msg_style) {
case PAM_PROMPT_ECHO_ON: /* assume want user name */
reply[i].resp_retcode = PAM_SUCCESS;
reply[i].resp = COPY_STRING(cred->uname);
/* PAM frees resp. */
break;
case PAM_PROMPT_ECHO_OFF: /* assume want password */
reply[i].resp_retcode = PAM_SUCCESS;
reply[i].resp = COPY_STRING(cred->pass);
/* PAM frees resp. */
break;
case PAM_TEXT_INFO:
case PAM_ERROR_MSG:
reply[i].resp_retcode = PAM_SUCCESS;
reply[i].resp = NULL;
break;
default: /* unknown message style */
free(reply);
return PAM_CONV_ERR;
}
}
*resp = reply;
return PAM_SUCCESS;
}
/*
* Attempt to authenticate the user using PAM. Returns 0 if the user is
* authenticated, or 1 if not authenticated. If some sort of PAM system
* error occurs (e.g., the "/etc/pam.conf" file is missing) then this
* function returns -1. This can be used as an indication that we should
* fall back to a different authentication mechanism.
*/
static int
auth_pam(struct passwd **ppw, const char *pass)
{
const char *tmpl_user;
const void *item;
int rval;
int e;
cred_t auth_cred = { (*ppw)->pw_name, pass };
struct pam_conv conv = { &auth_conv, &auth_cred };
e = pam_start("ftpd", (*ppw)->pw_name, &conv, &pamh);
if (e != PAM_SUCCESS) {
/*
* In OpenPAM, it's OK to pass NULL to pam_strerror()
* if context creation has failed in the first place.
*/
syslog(LOG_ERR, "pam_start: %s", pam_strerror(NULL, e));
return -1;
}
e = pam_set_item(pamh, PAM_RHOST, remotehost);
if (e != PAM_SUCCESS) {
syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s",
pam_strerror(pamh, e));
if ((e = pam_end(pamh, e)) != PAM_SUCCESS) {
syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e));
}
pamh = NULL;
return -1;
}
e = pam_authenticate(pamh, 0);
switch (e) {
case PAM_SUCCESS:
/*
* With PAM we support the concept of a "template"
* user. The user enters a login name which is
* authenticated by PAM, usually via a remote service
* such as RADIUS or TACACS+. If authentication
* succeeds, a different but related "template" name
* is used for setting the credentials, shell, and
* home directory. The name the user enters need only
* exist on the remote authentication server, but the
* template name must be present in the local password
* database.
*
* This is supported by two various mechanisms in the
* individual modules. However, from the application's
* point of view, the template user is always passed
* back as a changed value of the PAM_USER item.
*/
if ((e = pam_get_item(pamh, PAM_USER, &item)) ==
PAM_SUCCESS) {
tmpl_user = (const char *) item;
if (strcmp((*ppw)->pw_name, tmpl_user) != 0)
*ppw = getpwnam(tmpl_user);
} else
syslog(LOG_ERR, "Couldn't get PAM_USER: %s",
pam_strerror(pamh, e));
rval = 0;
break;
case PAM_AUTH_ERR:
case PAM_USER_UNKNOWN:
case PAM_MAXTRIES:
rval = 1;
break;
default:
syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e));
rval = -1;
break;
}
if (rval == 0) {
e = pam_acct_mgmt(pamh, 0);
if (e != PAM_SUCCESS) {
syslog(LOG_ERR, "pam_acct_mgmt: %s",
pam_strerror(pamh, e));
rval = 1;
}
}
if (rval != 0) {
if ((e = pam_end(pamh, e)) != PAM_SUCCESS) {
syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e));
}
pamh = NULL;
}
return rval;
}
#endif /* USE_PAM */
void
pass(char *passwd)
{
int rval;
FILE *fd;
#ifdef LOGIN_CAP
login_cap_t *lc = NULL;
#endif
#ifdef USE_PAM
int e;
#endif
char *residue = NULL;
char *xpasswd;
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 USE_PAM
rval = auth_pam(&pw, passwd);
if (rval >= 0) {
opieunlock();
goto skip;
}
#endif
if (opieverify(&opiedata, passwd) == 0)
xpasswd = pw->pw_passwd;
else if (pwok) {
xpasswd = crypt(passwd, pw->pw_passwd);
if (passwd[0] == '\0' && pw->pw_passwd[0] != '\0')
xpasswd = ":";
} else {
rval = 1;
goto skip;
}
rval = strcmp(pw->pw_passwd, xpasswd);
if (pw->pw_expire && time(NULL) >= pw->pw_expire)
rval = 1; /* failure */
skip:
/*
* If rval == 1, the user failed the authentication check
* above. If rval == 0, either PAM or local authentication
* succeeded.
*/
if (rval) {
reply(530, "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;
}
}
login_attempts = 0; /* this time successful */
if (setegid(pw->pw_gid) < 0) {
reply(550, "Can't set gid.");
return;
}
/* May be overridden by login.conf */
(void) umask(defumask);
#ifdef LOGIN_CAP
if ((lc = login_getpwclass(pw)) != NULL) {
char remote_ip[NI_MAXHOST];
if (getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len,
remote_ip, sizeof(remote_ip) - 1, NULL, 0,
NI_NUMERICHOST))
*remote_ip = 0;
remote_ip[sizeof(remote_ip) - 1] = 0;
if (!auth_hostok(lc, remotehost, remote_ip)) {
syslog(LOG_INFO|LOG_AUTH,
"FTP LOGIN FAILED (HOST) as %s: permission denied.",
pw->pw_name);
reply(530, "Permission denied.");
pw = NULL;
return;
}
if (!auth_timeok(lc, time(NULL))) {
reply(530, "Login not available right now.");
pw = NULL;
return;
}
}
setusercontext(lc, pw, 0,
LOGIN_SETLOGIN|LOGIN_SETGROUP|LOGIN_SETPRIORITY|
LOGIN_SETRESOURCES|LOGIN_SETUMASK|LOGIN_SETMAC);
#else
setlogin(pw->pw_name);
(void) initgroups(pw->pw_name, pw->pw_gid);
#endif
#ifdef USE_PAM
if (pamh) {
if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) {
syslog(LOG_ERR, "pam_open_session: %s", pam_strerror(pamh, e));
} else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED)) != PAM_SUCCESS) {
syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e));
}
}
#endif
/* open wtmp before chroot */
if (dowtmp)
ftpd_logwtmp(ttyline, pw->pw_name,
(struct sockaddr *)&his_addr);
logged_in = 1;
if (guest && stats && statfd < 0)
#ifdef VIRTUAL_HOSTING
statfd = open(thishost->statfile, O_WRONLY|O_APPEND);
#else
statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND);
#endif
if (statfd < 0)
stats = 0;
dochroot =
checkuser(_PATH_FTPCHROOT, pw->pw_name, 1, &residue)
#ifdef LOGIN_CAP /* Allow login.conf configuration as well */
|| login_getcapbool(lc, "ftp-chroot", 0)
#endif
;
chrootdir = NULL;
/*
* For a chrooted local user,
* a) see whether ftpchroot(5) specifies a chroot directory,
* b) extract the directory pathname from the line,
* c) expand it to the absolute pathname if necessary.
*/
if (dochroot && residue &&
(chrootdir = strtok(residue, " \t")) != NULL) {
if (chrootdir[0] != '/')
asprintf(&chrootdir, "%s/%s", pw->pw_dir, chrootdir);
else
chrootdir = strdup(chrootdir); /* make it permanent */
if (chrootdir == NULL)
fatalerror("Ran out of memory.");
}
if (guest || dochroot) {
/*
* If no chroot directory set yet, use the login directory.
* Copy it so it can be modified while pw->pw_dir stays intact.
*/
if (chrootdir == NULL &&
(chrootdir = strdup(pw->pw_dir)) == NULL)
fatalerror("Ran out of memory.");
/*
* Check for the "/chroot/./home" syntax,
* separate the chroot and home directory pathnames.
*/
if ((homedir = strstr(chrootdir, "/./")) != NULL) {
*(homedir++) = '\0'; /* wipe '/' */
homedir++; /* skip '.' */
} else {
/*
* We MUST do a chdir() after the chroot. Otherwise
* the old current directory will be accessible as "."
* outside the new root!
*/
homedir = "/";
}
/*
* Finally, do chroot()
*/
if (chroot(chrootdir) < 0) {
reply(550, "Can't change root.");
goto bad;
}
} else /* real user w/o chroot */
homedir = pw->pw_dir;
/*
* Set euid *before* doing chdir() so
* a) the user won't be carried to a directory that he couldn't reach
* on his own due to no permission to upper path components,
* b) NFS mounted homedirs w/restrictive permissions will be accessible
* (uid 0 has no root power over NFS if not mapped explicitly.)
*/
if (seteuid(pw->pw_uid) < 0) {
reply(550, "Can't set uid.");
goto bad;
}
if (chdir(homedir) < 0) {
if (guest || dochroot) {
reply(550, "Can't change to base directory.");
goto bad;
} else {
if (chdir("/") < 0) {
reply(550, "Root is inaccessible.");
goto bad;
}
lreply(230, "No directory! Logging in with home=/.");
}
}
/*
* Display a login message, if it exists.
* N.B. reply(230,) must follow the message.
*/
#ifdef VIRTUAL_HOSTING
fd = fopen(thishost->loginmsg, "r");
#else
fd = fopen(_PATH_FTPLOGINMESG, "r");
#endif
if (fd != 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);
}
if (guest) {
if (ident != NULL)
free(ident);
ident = strdup(passwd);
if (ident == NULL)
fatalerror("Ran out of memory.");
reply(230, "Guest login ok, access restrictions apply.");
#ifdef SETPROCTITLE
#ifdef VIRTUAL_HOSTING
if (thishost != firsthost)
snprintf(proctitle, sizeof(proctitle),
"%s: anonymous(%s)/%s", remotehost, hostname,
passwd);
else
#endif
snprintf(proctitle, sizeof(proctitle),
"%s: anonymous/%s", remotehost, passwd);
setproctitle("%s", proctitle);
#endif /* SETPROCTITLE */
if (logging)
syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s",
remotehost, passwd);
} else {
if (dochroot)
reply(230, "User %s logged in, "
"access restrictions apply.", pw->pw_name);
else
reply(230, "User %s logged in.", pw->pw_name);
#ifdef SETPROCTITLE
snprintf(proctitle, sizeof(proctitle),
"%s: user/%s", remotehost, pw->pw_name);
setproctitle("%s", proctitle);
#endif /* SETPROCTITLE */
if (logging)
syslog(LOG_INFO, "FTP LOGIN FROM %s as %s",
remotehost, pw->pw_name);
}
if (logging && (guest || dochroot))
syslog(LOG_INFO, "session root changed to %s", chrootdir);
#ifdef LOGIN_CAP
login_close(lc);
#endif
if (residue)
free(residue);
return;
bad:
/* Forget all about it... */
#ifdef LOGIN_CAP
login_close(lc);
#endif
if (residue)
free(residue);
end_login();
}
void
retrieve(char *cmd, char *name)
{
FILE *fin, *dout;
struct stat st;
int (*closefunc)(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) {
if (fstat(fileno(fin), &st) < 0) {
perror_reply(550, name);
goto done;
}
if (!S_ISREG(st.st_mode)) {
/*
* Never sending a raw directory is a workaround
* for buggy clients that will attempt to RETR
* a directory before listing it, e.g., Mozilla.
* Preventing a guest from getting irregular files
* is a simple security measure.
*/
if (S_ISDIR(st.st_mode) || guest) {
reply(550, "%s: not a plain file.", name);
goto done;
}
st.st_size = -1;
/* st.st_blksize is set for all descriptor types */
}
}
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, L_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 && guest && stats && byte_count > 0)
logxfer(name, byte_count, start);
(void) fclose(dout);
data = -1;
pdata = -1;
done:
if (cmd == 0)
LOGBYTES("get", name, byte_count);
(*closefunc)(fin);
}
void
store(char *name, char *mode, int unique)
{
int fd;
FILE *fout, *din;
int (*closefunc)(FILE *);
if (*mode == 'a') { /* APPE */
if (unique) {
/* Programming error */
syslog(LOG_ERR, "Internal: unique flag to APPE");
unique = 0;
}
if (guest && noguestmod) {
reply(550, "Appending to existing file denied.");
goto err;
}
restart_point = 0; /* not affected by preceding REST */
}
if (unique) /* STOU overrides REST */
restart_point = 0;
if (guest && noguestmod) {
if (restart_point) { /* guest STOR w/REST */
reply(550, "Modifying existing file denied.");
goto err;
} else /* treat guest STOR as STOU */
unique = 1;
}
if (restart_point)
mode = "r+"; /* so ASCII manual seek can work */
if (unique) {
if ((fd = guniquefd(name, &name)) < 0)
goto err;
fout = fdopen(fd, mode);
} else
fout = fopen(name, mode);
closefunc = fclose;
if (fout == NULL) {
perror_reply(553, name);
goto err;
}
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 (fseeko(fout, 0, SEEK_CUR) < 0) {
perror_reply(550, name);
goto done;
}
} else if (lseek(fileno(fout), restart_point, L_SET) < 0) {
perror_reply(550, name);
goto done;
}
}
din = dataconn(name, -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 == 'a' ? "append" : "put", name, byte_count);
(*closefunc)(fout);
return;
err:
LOGCMD(*mode == 'a' ? "append" : "put" , name);
return;
}
static FILE *
getdatasock(char *mode)
{
int on = 1, s, t, tries;
if (data >= 0)
return (fdopen(data, mode));
s = socket(data_dest.su_family, SOCK_STREAM, 0);
if (s < 0)
goto bad;
if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
syslog(LOG_WARNING, "data setsockopt (SO_REUSEADDR): %m");
/* anchor socket to avoid multi-homing problems */
data_source = ctrl_addr;
data_source.su_port = htons(dataport);
(void) seteuid(0);
for (tries = 1; ; tries++) {
/*
* We should loop here since it's possible that
* another ftpd instance has passed this point and is
* trying to open a data connection in active mode now.
* Until the other connection is opened, we'll be getting
* EADDRINUSE because no SOCK_STREAM sockets in the system
* can share both local and remote addresses, localIP:20
* and *:* in this case.
*/
if (bind(s, (struct sockaddr *)&data_source,
data_source.su_len) >= 0)
break;
if (errno != EADDRINUSE || tries > 10)
goto bad;
sleep(tries);
}
(void) seteuid(pw->pw_uid);
#ifdef IP_TOS
if (data_source.su_family == AF_INET)
{
on = IPTOS_THROUGHPUT;
if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, sizeof(int)) < 0)
syslog(LOG_WARNING, "data 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, &on, sizeof on) < 0)
syslog(LOG_WARNING, "data setsockopt (TCP_NOPUSH): %m");
#endif
#ifdef SO_SNDBUF
on = 65536;
if (setsockopt(s, SOL_SOCKET, SO_SNDBUF, &on, sizeof on) < 0)
syslog(LOG_WARNING, "data setsockopt (SO_SNDBUF): %m");
#endif
return (fdopen(s, mode));
bad:
/* Return the real value of errno (close may change it) */
t = errno;
(void) seteuid(pw->pw_uid);
(void) close(s);
errno = t;
return (NULL);
}
static FILE *
dataconn(char *name, off_t size, char *mode)
{
char sizebuf[32];
FILE *file;
int retry = 0, tos, conerrno;
file_size = size;
byte_count = 0;
if (size != -1)
(void) snprintf(sizebuf, sizeof(sizebuf),
" (%jd bytes)", (intmax_t)size);
else
*sizebuf = '\0';
if (pdata >= 0) {
union sockunion from;
socklen_t fromlen = ctrl_addr.su_len;
int flags, s;
struct timeval timeout;
fd_set set;
FD_ZERO(&set);
FD_SET(pdata, &set);
timeout.tv_usec = 0;
timeout.tv_sec = 120;
/*
* Granted a socket is in the blocking I/O mode,
* accept() will block after a successful select()
* if the selected connection dies in between.
* Therefore set the non-blocking I/O flag here.
*/
if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 ||
fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1)
goto pdata_err;
if (select(pdata+1, &set, NULL, NULL, &timeout) <= 0 ||
(s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0)
goto pdata_err;
(void) close(pdata);
pdata = s;
/*
* Unset the inherited non-blocking I/O flag
* on the child socket so stdio can work on it.
*/
if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 ||
fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1)
goto pdata_err;
#ifdef IP_TOS
if (from.su_family == AF_INET)
{
tos = IPTOS_THROUGHPUT;
if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0)
syslog(LOG_WARNING, "pdata setsockopt (IP_TOS): %m");
}
#endif
reply(150, "Opening %s mode data connection for '%s'%s.",
type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf);
return (fdopen(pdata, mode));
pdata_err:
reply(425, "Can't open data connection.");
(void) close(pdata);
pdata = -1;
return (NULL);
}
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;
do {
file = getdatasock(mode);
if (file == NULL) {
char hostbuf[NI_MAXHOST], portbuf[NI_MAXSERV];
if (getnameinfo((struct sockaddr *)&data_source,
data_source.su_len,
hostbuf, sizeof(hostbuf) - 1,
portbuf, sizeof(portbuf) - 1,
NI_NUMERICHOST|NI_NUMERICSERV))
*hostbuf = *portbuf = 0;
hostbuf[sizeof(hostbuf) - 1] = 0;
portbuf[sizeof(portbuf) - 1] = 0;
reply(425, "Can't create data socket (%s,%s): %s.",
hostbuf, portbuf, strerror(errno));
return (NULL);
}
data = fileno(file);
conerrno = 0;
if (connect(data, (struct sockaddr *)&data_dest,
data_dest.su_len) == 0)
break;
conerrno = errno;
(void) fclose(file);
data = -1;
if (conerrno == EADDRINUSE) {
sleep(swaitint);
retry += swaitint;
} else {
break;
}
} while (retry <= swaitmax);
if (conerrno != 0) {
reply(425, "Can't build data connection: %s.",
strerror(conerrno));
return (NULL);
}
reply(150, "Opening %s mode data connection for '%s'%s.",
type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf);
return (file);
}
/*
* A helper macro to avoid code duplication
* in send_data() and receive_data().
*
* XXX We have to block SIGURG during putc() because BSD stdio
* is unable to restart interrupted write operations and hence
* the entire buffer contents will be lost as soon as a write()
* call indicates EINTR to stdio.
*/
#define FTPD_PUTC(ch, file, label) \
do { \
int ret; \
\
do { \
START_UNSAFE; \
ret = putc((ch), (file)); \
END_UNSAFE; \
CHECKOOB(return (-1)) \
else if (ferror(file)) \
goto label; \
clearerr(file); \
} while (ret == EOF); \
} while (0)
/*
* Tranfer the contents of "instr" to "outstr" peer using the appropriate
* encapsulation of the data subject to Mode, Structure, and Type.
*
* NB: Form isn't handled.
*/
static int
send_data(FILE *instr, FILE *outstr, size_t blksize, off_t filesize, int isreg)
{
int c, cp, filefd, netfd;
char *buf;
STARTXFER;
switch (type) {
case TYPE_A:
cp = EOF;
for (;;) {
c = getc(instr);
CHECKOOB(return (-1))
else if (c == EOF && ferror(instr))
goto file_err;
if (c == EOF) {
if (ferror(instr)) { /* resume after OOB */
clearerr(instr);
continue;
}
if (feof(instr)) /* EOF */
break;
syslog(LOG_ERR, "Internal: impossible condition"
" on file after getc()");
goto file_err;
}
if (c == '\n' && cp != '\r') {
FTPD_PUTC('\r', outstr, data_err);
byte_count++;
}
FTPD_PUTC(c, outstr, data_err);
byte_count++;
cp = c;
}
#ifdef notyet /* BSD stdio isn't ready for that */
while (fflush(outstr) == EOF) {
CHECKOOB(return (-1))
else
goto data_err;
clearerr(outstr);
}
ENDXFER;
#else
ENDXFER;
if (fflush(outstr) == EOF)
goto data_err;
#endif
reply(226, "Transfer complete.");
return (0);
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) {
char *msg = "Transfer complete.";
off_t cnt, offset;
int err;
cnt = offset = 0;
while (filesize > 0) {
err = sendfile(filefd, netfd, offset, 0,
NULL, &cnt, 0);
/*
* Calculate byte_count before OOB processing.
* It can be used in myoob() later.
*/
byte_count += cnt;
offset += cnt;
filesize -= cnt;
CHECKOOB(return (-1))
else if (err == -1) {
if (errno != EINTR &&
cnt == 0 && offset == 0)
goto oldway;
goto data_err;
}
if (err == -1) /* resume after OOB */
continue;
/*
* We hit the EOF prematurely.
* Perhaps the file was externally truncated.
*/
if (cnt == 0) {
msg = "Transfer finished due to "
"premature end of file.";
break;
}
}
ENDXFER;
reply(226, msg);
return (0);
}
oldway:
if ((buf = malloc(blksize)) == NULL) {
ENDXFER;
reply(451, "Ran out of memory.");
return (-1);
}
for (;;) {
int cnt, len;
char *bp;
cnt = read(filefd, buf, blksize);
CHECKOOB(free(buf); return (-1))
else if (cnt < 0) {
free(buf);
goto file_err;
}
if (cnt < 0) /* resume after OOB */
continue;
if (cnt == 0) /* EOF */
break;
for (len = cnt, bp = buf; len > 0;) {
cnt = write(netfd, bp, len);
CHECKOOB(free(buf); return (-1))
else if (cnt < 0) {
free(buf);
goto data_err;
}
if (cnt <= 0)
continue;
len -= cnt;
bp += cnt;
byte_count += cnt;
}
}
ENDXFER;
free(buf);
reply(226, "Transfer complete.");
return (0);
default:
ENDXFER;
reply(550, "Unimplemented TYPE %d in send_data.", type);
return (-1);
}
data_err:
ENDXFER;
perror_reply(426, "Data connection");
return (-1);
file_err:
ENDXFER;
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(FILE *instr, FILE *outstr)
{
int c, cp;
int bare_lfs = 0;
STARTXFER;
switch (type) {
case TYPE_I:
case TYPE_L:
for (;;) {
int cnt, len;
char *bp;
char buf[BUFSIZ];
cnt = read(fileno(instr), buf, sizeof(buf));
CHECKOOB(return (-1))
else if (cnt < 0)
goto data_err;
if (cnt < 0) /* resume after OOB */
continue;
if (cnt == 0) /* EOF */
break;
for (len = cnt, bp = buf; len > 0;) {
cnt = write(fileno(outstr), bp, len);
CHECKOOB(return (-1))
else if (cnt < 0)
goto file_err;
if (cnt <= 0)
continue;
len -= cnt;
bp += cnt;
byte_count += cnt;
}
}
ENDXFER;
return (0);
case TYPE_E:
ENDXFER;
reply(553, "TYPE E not implemented.");
return (-1);
case TYPE_A:
cp = EOF;
for (;;) {
c = getc(instr);
CHECKOOB(return (-1))
else if (c == EOF && ferror(instr))
goto data_err;
if (c == EOF && ferror(instr)) { /* resume after OOB */
clearerr(instr);
continue;
}
if (cp == '\r') {
if (c != '\n')
FTPD_PUTC('\r', outstr, file_err);
} else
if (c == '\n')
bare_lfs++;
if (c == '\r') {
byte_count++;
cp = c;
continue;
}
/* Check for EOF here in order not to lose last \r. */
if (c == EOF) {
if (feof(instr)) /* EOF */
break;
syslog(LOG_ERR, "Internal: impossible condition"
" on data stream after getc()");
goto data_err;
}
byte_count++;
FTPD_PUTC(c, outstr, file_err);
cp = c;
}
#ifdef notyet /* BSD stdio isn't ready for that */
while (fflush(outstr) == EOF) {
CHECKOOB(return (-1))
else
goto file_err;
clearerr(outstr);
}
ENDXFER;
#else
ENDXFER;
if (fflush(outstr) == EOF)
goto file_err;
#endif
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:
ENDXFER;
reply(550, "Unimplemented TYPE %d in receive_data.", type);
return (-1);
}
data_err:
ENDXFER;
perror_reply(426, "Data connection");
return (-1);
file_err:
ENDXFER;
perror_reply(452, "Error writing to file");
return (-1);
}
void
statfilecmd(char *filename)
{
FILE *fin;
int atstart;
int c, code;
char line[LINE_MAX];
struct stat st;
code = lstat(filename, &st) == 0 && S_ISDIR(st.st_mode) ? 212 : 213;
(void)snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename);
fin = ftpd_popen(line, "r");
lreply(code, "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);
}
/*
* RFC 959 says neutral text should be prepended before
* a leading 3-digit number followed by whitespace, but
* many ftp clients can be confused by any leading digits,
* as a matter of fact.
*/
if (atstart && isdigit(c))
(void) putc(' ', stdout);
(void) putc(c, stdout);
atstart = (c == '\n');
}
(void) ftpd_pclose(fin);
reply(code, "End of status.");
}
void
statcmd(void)
{
union sockunion *su;
u_char *a, *p;
char hname[NI_MAXHOST];
int ispassive;
if (hostinfo) {
lreply(211, "%s FTP server status:", hostname);
printf(" %s\r\n", version);
} else
lreply(211, "FTP server status:");
printf(" Connected to %s", remotehost);
if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len,
hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST)) {
hname[sizeof(hname) - 1] = 0;
if (strcmp(hname, remotehost) != 0)
printf(" (%s)", hname);
}
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 CHAR_BIT == 8
printf(" %d", CHAR_BIT);
#else
printf(" %d", bytesize); /* need definition! */
#endif
printf("; STRUcture: %s; transfer MODE: %s\r\n",
strunames[stru], modenames[mode]);
if (data != -1)
printf(" Data connection open\r\n");
else if (pdata != -1) {
ispassive = 1;
su = &pasv_addr;
goto printaddr;
} else if (usedefault == 0) {
ispassive = 0;
su = &data_dest;
printaddr:
#define UC(b) (((int) b) & 0xff)
if (epsvall) {
printf(" EPSV only mode (EPSV ALL)\r\n");
goto epsvonly;
}
/* PORT/PASV */
if (su->su_family == AF_INET) {
a = (u_char *) &su->su_sin.sin_addr;
p = (u_char *) &su->su_sin.sin_port;
printf(" %s (%d,%d,%d,%d,%d,%d)\r\n",
ispassive ? "PASV" : "PORT",
UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]),
UC(p[0]), UC(p[1]));
}
/* LPRT/LPSV */
{
int alen, af, i;
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) {
printf(" %s (%d,%d,", ispassive ? "LPSV" : "LPRT",
af, alen);
for (i = 0; i < alen; i++)
printf("%d,", UC(a[i]));
printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1]));
}
}
epsvonly:;
/* EPRT/EPSV */
{
int af;
switch (su->su_family) {
case AF_INET:
af = 1;
break;
case AF_INET6:
af = 2;
break;
default:
af = 0;
break;
}
if (af) {
union sockunion tmp;
tmp = *su;
if (tmp.su_family == AF_INET6)
tmp.su_sin6.sin6_scope_id = 0;
if (!getnameinfo((struct sockaddr *)&tmp, tmp.su_len,
hname, sizeof(hname) - 1, NULL, 0,
NI_NUMERICHOST)) {
hname[sizeof(hname) - 1] = 0;
printf(" %s |%d|%s|%d|\r\n",
ispassive ? "EPSV" : "EPRT",
af, hname, htons(tmp.su_port));
}
}
}
#undef UC
} else
printf(" No data connection\r\n");
reply(211, "End of status.");
}
void
fatalerror(char *s)
{
reply(451, "Error in server: %s", s);
reply(221, "Closing connection due to server error.");
dologout(0);
/* NOTREACHED */
}
void
reply(int n, const char *fmt, ...)
{
va_list ap;
(void)printf("%d ", n);
va_start(ap, fmt);
(void)vprintf(fmt, ap);
va_end(ap);
(void)printf("\r\n");
(void)fflush(stdout);
if (ftpdebug) {
syslog(LOG_DEBUG, "<--- %d ", n);
va_start(ap, fmt);
vsyslog(LOG_DEBUG, fmt, ap);
va_end(ap);
}
}
void
lreply(int n, const char *fmt, ...)
{
va_list ap;
(void)printf("%d- ", n);
va_start(ap, fmt);
(void)vprintf(fmt, ap);
va_end(ap);
(void)printf("\r\n");
(void)fflush(stdout);
if (ftpdebug) {
syslog(LOG_DEBUG, "<--- %d- ", n);
va_start(ap, fmt);
vsyslog(LOG_DEBUG, fmt, ap);
va_end(ap);
}
}
static void
ack(char *s)
{
reply(250, "%s command successful.", s);
}
void
nack(char *s)
{
reply(502, "%s command not implemented.", s);
}
/* ARGSUSED */
void
yyerror(char *s)
{
char *cp;
if ((cp = strchr(cbuf,'\n')))
*cp = '\0';
reply(500, "%s: command not understood.", cbuf);
}
void
delete(char *name)
{
struct stat st;
LOGCMD("delete", name);
if (lstat(name, &st) < 0) {
perror_reply(550, name);
return;
}
if (S_ISDIR(st.st_mode)) {
if (rmdir(name) < 0) {
perror_reply(550, name);
return;
}
goto done;
}
if (guest && noguestmod) {
reply(550, "Operation not permitted.");
return;
}
if (unlink(name) < 0) {
perror_reply(550, name);
return;
}
done:
ack("DELE");
}
void
cwd(char *path)
{
if (chdir(path) < 0)
perror_reply(550, path);
else
ack("CWD");
}
void
makedir(char *name)
{
char *s;
LOGCMD("mkdir", name);
if (guest && noguestmkd)
reply(550, "Operation not permitted.");
else if (mkdir(name, 0777) < 0)
perror_reply(550, name);
else {
if ((s = doublequote(name)) == NULL)
fatalerror("Ran out of memory.");
reply(257, "\"%s\" directory created.", s);
free(s);
}
}
void
removedir(char *name)
{
LOGCMD("rmdir", name);
if (rmdir(name) < 0)
perror_reply(550, name);
else
ack("RMD");
}
void
pwd(void)
{
char *s, path[MAXPATHLEN + 1];
if (getcwd(path, sizeof(path)) == NULL)
perror_reply(550, "Get current directory");
else {
if ((s = doublequote(path)) == NULL)
fatalerror("Ran out of memory.");
reply(257, "\"%s\" is current directory.", s);
free(s);
}
}
char *
renamefrom(char *name)
{
struct stat st;
if (guest && noguestmod) {
reply(550, "Operation not permitted.");
return (NULL);
}
if (lstat(name, &st) < 0) {
perror_reply(550, name);
return (NULL);
}
reply(350, "File exists, ready for destination name.");
return (name);
}
void
renamecmd(char *from, char *to)
{
struct stat st;
LOGCMD2("rename", from, to);
if (guest && (stat(to, &st) == 0)) {
reply(550, "%s: permission denied.", to);
return;
}
if (rename(from, to) < 0)
perror_reply(550, "rename");
else
ack("RNTO");
}
static void
dolog(struct sockaddr *who)
{
char who_name[NI_MAXHOST];
realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len);
remotehost[sizeof(remotehost) - 1] = 0;
if (getnameinfo(who, who->sa_len,
who_name, sizeof(who_name) - 1, NULL, 0, NI_NUMERICHOST))
*who_name = 0;
who_name[sizeof(who_name) - 1] = 0;
#ifdef SETPROCTITLE
#ifdef VIRTUAL_HOSTING
if (thishost != firsthost)
snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)",
remotehost, hostname);
else
#endif
snprintf(proctitle, sizeof(proctitle), "%s: connected",
remotehost);
setproctitle("%s", proctitle);
#endif /* SETPROCTITLE */
if (logging) {
#ifdef VIRTUAL_HOSTING
if (thishost != firsthost)
syslog(LOG_INFO, "connection from %s (%s) to %s",
remotehost, who_name, hostname);
else
#endif
syslog(LOG_INFO, "connection from %s (%s)",
remotehost, who_name);
}
}
/*
* Record logout in wtmp file
* and exit with supplied status.
*/
void
dologout(int status)
{
if (logged_in && dowtmp) {
(void) seteuid(0);
ftpd_logwtmp(ttyline, "", NULL);
}
/* beware of flushing buffers after a SIGPIPE */
_exit(status);
}
static void
sigurg(int signo)
{
recvurg = 1;
}
static void
maskurg(int flag)
{
int oerrno;
sigset_t sset;
if (!transflag) {
syslog(LOG_ERR, "Internal: maskurg() while no transfer");
return;
}
oerrno = errno;
sigemptyset(&sset);
sigaddset(&sset, SIGURG);
sigprocmask(flag ? SIG_BLOCK : SIG_UNBLOCK, &sset, NULL);
errno = oerrno;
}
static void
flagxfer(int flag)
{
if (flag) {
if (transflag)
syslog(LOG_ERR, "Internal: flagxfer(1): "
"transfer already under way");
transflag = 1;
maskurg(0);
recvurg = 0;
} else {
if (!transflag)
syslog(LOG_ERR, "Internal: flagxfer(0): "
"no active transfer");
maskurg(1);
transflag = 0;
}
}
/*
* Returns 0 if OK to resume or -1 if abort requested.
*/
static int
myoob(void)
{
char *cp;
if (!transflag) {
syslog(LOG_ERR, "Internal: myoob() while no transfer");
return (0);
}
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.");
return (-1);
}
if (strcmp(cp, "STAT\r\n") == 0) {
tmpline[0] = '\0';
if (file_size != -1)
reply(213, "Status: %jd of %jd bytes transferred.",
(intmax_t)byte_count, (intmax_t)file_size);
else
reply(213, "Status: %jd bytes transferred.",
(intmax_t)byte_count);
}
return (0);
}
/*
* Note: a response of 425 is not mentioned as a possible response to
* the PASV command in RFC959. However, it has been blessed as
* a legitimate response by Jon Postel in a telephone conversation
* with Rick Adams on 25 Jan 89.
*/
void
passive(void)
{
socklen_t len;
int on;
char *p, *a;
if (pdata >= 0) /* close old port if one set */
close(pdata);
pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0);
if (pdata < 0) {
perror_reply(425, "Can't open passive connection");
return;
}
on = 1;
if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m");
(void) seteuid(0);
#ifdef IP_PORTRANGE
if (ctrl_addr.su_family == AF_INET) {
on = restricted_data_ports ? IP_PORTRANGE_HIGH
: IP_PORTRANGE_DEFAULT;
if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE,
&on, sizeof(on)) < 0)
goto pasv_error;
}
#endif
#ifdef IPV6_PORTRANGE
if (ctrl_addr.su_family == AF_INET6) {
on = restricted_data_ports ? IPV6_PORTRANGE_HIGH
: IPV6_PORTRANGE_DEFAULT;
if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE,
&on, sizeof(on)) < 0)
goto pasv_error;
}
#endif
pasv_addr = ctrl_addr;
pasv_addr.su_port = 0;
if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0)
goto pasv_error;
(void) seteuid(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;
if (pasv_addr.su_family == AF_INET)
a = (char *) &pasv_addr.su_sin.sin_addr;
else if (pasv_addr.su_family == AF_INET6 &&
IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr))
a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12];
else
goto pasv_error;
p = (char *) &pasv_addr.su_port;
#define UC(b) (((int) b) & 0xff)
reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]),
UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1]));
return;
pasv_error:
(void) seteuid(pw->pw_uid);
(void) close(pdata);
pdata = -1;
perror_reply(425, "Can't open passive connection");
return;
}
/*
* Long Passive defined in RFC 1639.
* 228 Entering Long Passive Mode
* (af, hal, h1, h2, h3,..., pal, p1, p2...)
*/
void
long_passive(char *cmd, int pf)
{
socklen_t len;
int on;
char *p, *a;
if (pdata >= 0) /* close old port if one set */
close(pdata);
if (pf != PF_UNSPEC) {
if (ctrl_addr.su_family != pf) {
switch (ctrl_addr.su_family) {
case AF_INET:
pf = 1;
break;
case AF_INET6:
pf = 2;
break;
default:
pf = 0;
break;
}
/*
* XXX
* only EPRT/EPSV ready clients will understand this
*/
if (strcmp(cmd, "EPSV") == 0 && pf) {
reply(522, "Network protocol mismatch, "
"use (%d)", pf);
} else
reply(501, "Network protocol mismatch."); /*XXX*/
return;
}
}
pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0);
if (pdata < 0) {
perror_reply(425, "Can't open passive connection");
return;
}
on = 1;
if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m");
(void) seteuid(0);
pasv_addr = ctrl_addr;
pasv_addr.su_port = 0;
len = pasv_addr.su_len;
#ifdef IP_PORTRANGE
if (ctrl_addr.su_family == AF_INET) {
on = restricted_data_ports ? IP_PORTRANGE_HIGH
: IP_PORTRANGE_DEFAULT;
if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE,
&on, sizeof(on)) < 0)
goto pasv_error;
}
#endif
#ifdef IPV6_PORTRANGE
if (ctrl_addr.su_family == AF_INET6) {
on = restricted_data_ports ? IPV6_PORTRANGE_HIGH
: IPV6_PORTRANGE_DEFAULT;
if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE,
&on, sizeof(on)) < 0)
goto pasv_error;
}
#endif
if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0)
goto pasv_error;
(void) seteuid(pw->pw_uid);
if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0)
goto pasv_error;
if (listen(pdata, 1) < 0)
goto pasv_error;
#define UC(b) (((int) b) & 0xff)
if (strcmp(cmd, "LPSV") == 0) {
p = (char *)&pasv_addr.su_port;
switch (pasv_addr.su_family) {
case AF_INET:
a = (char *) &pasv_addr.su_sin.sin_addr;
v4_reply:
reply(228,
"Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)",
4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]),
2, UC(p[0]), UC(p[1]));
return;
case AF_INET6:
if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) {
a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12];
goto v4_reply;
}
a = (char *) &pasv_addr.su_sin6.sin6_addr;
reply(228,
"Entering Long Passive Mode "
"(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)",
6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]),
UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]),
UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]),
UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]),
2, UC(p[0]), UC(p[1]));
return;
}
} else if (strcmp(cmd, "EPSV") == 0) {
switch (pasv_addr.su_family) {
case AF_INET:
case AF_INET6:
reply(229, "Entering Extended Passive Mode (|||%d|)",
ntohs(pasv_addr.su_port));
return;
}
} else {
/* more proper error code? */
}
pasv_error:
(void) seteuid(pw->pw_uid);
(void) close(pdata);
pdata = -1;
perror_reply(425, "Can't open passive connection");
return;
}
/*
* Generate unique name for file with basename "local"
* and open the file in order to avoid possible races.
* Try "local" first, then "local.1", "local.2" etc, up to "local.99".
* Return descriptor to the file, set "name" to its name.
*
* Generates failure reply on error.
*/
static int
guniquefd(char *local, char **name)
{
static char new[MAXPATHLEN];
struct stat st;
char *cp;
int count;
int fd;
cp = strrchr(local, '/');
if (cp)
*cp = '\0';
if (stat(cp ? local : ".", &st) < 0) {
perror_reply(553, cp ? local : ".");
return (-1);
}
if (cp) {
/*
* Let not overwrite dirname with counter suffix.
* -4 is for /nn\0
* In this extreme case dot won't be put in front of suffix.
*/
if (strlen(local) > sizeof(new) - 4) {
reply(553, "Pathname too long.");
return (-1);
}
*cp = '/';
}
/* -4 is for the .nn<null> we put on the end below */
(void) snprintf(new, sizeof(new) - 4, "%s", local);
cp = new + strlen(new);
/*
* Don't generate dotfile unless requested explicitly.
* This covers the case when basename gets truncated off
* by buffer size.
*/
if (cp > new && cp[-1] != '/')
*cp++ = '.';
for (count = 0; count < 100; count++) {
/* At count 0 try unmodified name */
if (count)
(void)sprintf(cp, "%d", count);
if ((fd = open(count ? new : local,
O_RDWR | O_CREAT | O_EXCL, 0666)) >= 0) {
*name = count ? new : local;
return (fd);
}
if (errno != EEXIST) {
perror_reply(553, count ? new : local);
return (-1);
}
}
reply(452, "Unique file name cannot be created.");
return (-1);
}
/*
* Format and send reply containing system error number.
*/
void
perror_reply(int code, char *string)
{
reply(code, "%s: %s.", string, strerror(errno));
}
static char *onefile[] = {
"",
0
};
void
send_file_list(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) {
int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE;
memset(&gl, 0, sizeof(gl));
gl.gl_matchc = MAXGLOBARGS;
flags |= GLOB_LIMIT;
freeglob = 1;
if (glob(whichf, flags, 0, &gl)) {
reply(550, "No matching files 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;
}
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 &&
dout == NULL)
retrieve(_PATH_LS " %s", dirname);
else
perror_reply(550, whichf);
goto out;
}
if (S_ISREG(st.st_mode)) {
if (dout == NULL) {
dout = dataconn("file list", -1, "w");
if (dout == NULL)
goto out;
STARTXFER;
}
START_UNSAFE;
fprintf(dout, "%s%s\n", dirname,
type == TYPE_A ? "\r" : "");
END_UNSAFE;
if (ferror(dout))
goto data_err;
byte_count += strlen(dirname) +
(type == TYPE_A ? 2 : 1);
CHECKOOB(goto abrt);
continue;
} else if (!S_ISDIR(st.st_mode))
continue;
if ((dirp = opendir(dirname)) == NULL)
continue;
while ((dir = readdir(dirp)) != NULL) {
char nbuf[MAXPATHLEN];
CHECKOOB(goto abrt);
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", -1, "w");
if (dout == NULL)
goto out;
STARTXFER;
}
START_UNSAFE;
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" : "");
END_UNSAFE;
if (ferror(dout))
goto data_err;
byte_count += strlen(nbuf) +
(type == TYPE_A ? 2 : 1);
CHECKOOB(goto abrt);
}
}
(void) closedir(dirp);
dirp = NULL;
}
if (dout == NULL)
reply(550, "No files found.");
else if (ferror(dout))
data_err: perror_reply(550, "Data connection");
else
reply(226, "Transfer complete.");
out:
if (dout) {
ENDXFER;
abrt:
(void) fclose(dout);
data = -1;
pdata = -1;
}
if (dirp)
(void) closedir(dirp);
if (freeglob) {
freeglob = 0;
globfree(&gl);
}
}
void
reapchild(int signo)
{
while (waitpid(-1, NULL, WNOHANG) > 0);
}
#ifdef OLD_SETPROCTITLE
/*
* Clobber argv so ps will show what we're doing. (Stolen from sendmail.)
* Warning, since this is usually started from inetd.conf, it often doesn't
* have much of an environment or arglist to overwrite.
*/
void
setproctitle(const char *fmt, ...)
{
int i;
va_list ap;
char *p, *bp, ch;
char buf[LINE_MAX];
va_start(ap, fmt);
(void)vsnprintf(buf, sizeof(buf), fmt, ap);
/* make ps print our process name */
p = Argv[0];
*p++ = '-';
i = strlen(buf);
if (i > LastArgv - p - 2) {
i = LastArgv - p - 2;
buf[i] = '\0';
}
bp = buf;
while (ch = *bp++)
if (ch != '\n' && ch != '\r')
*p++ = ch;
while (p < LastArgv)
*p++ = ' ';
}
#endif /* OLD_SETPROCTITLE */
static void
appendf(char **strp, char *fmt, ...)
{
va_list ap;
char *ostr, *p;
va_start(ap, fmt);
vasprintf(&p, fmt, ap);
va_end(ap);
if (p == NULL)
fatalerror("Ran out of memory.");
if (*strp == NULL)
*strp = p;
else {
ostr = *strp;
asprintf(strp, "%s%s", ostr, p);
if (*strp == NULL)
fatalerror("Ran out of memory.");
free(ostr);
}
}
static void
logcmd(char *cmd, char *file1, char *file2, off_t cnt)
{
char *msg = NULL;
char wd[MAXPATHLEN + 1];
if (logging <= 1)
return;
if (getcwd(wd, sizeof(wd) - 1) == NULL)
strcpy(wd, strerror(errno));
appendf(&msg, "%s", cmd);
if (file1)
appendf(&msg, " %s", file1);
if (file2)
appendf(&msg, " %s", file2);
if (cnt >= 0)
appendf(&msg, " = %jd bytes", (intmax_t)cnt);
appendf(&msg, " (wd: %s", wd);
if (guest || dochroot)
appendf(&msg, "; chrooted");
appendf(&msg, ")");
syslog(LOG_INFO, "%s", msg);
free(msg);
}
static void
logxfer(char *name, off_t size, time_t start)
{
char buf[MAXPATHLEN + 1024];
char path[MAXPATHLEN + 1];
time_t now;
if (statfd >= 0) {
time(&now);
if (realpath(name, path) == NULL) {
syslog(LOG_NOTICE, "realpath failed on %s: %m", path);
return;
}
snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s!%jd!%ld\n",
ctime(&now)+4, ident, remotehost,
path, (intmax_t)size,
(long)(now - start + (now == start)));
write(statfd, buf, strlen(buf));
}
}
static char *
doublequote(char *s)
{
int n;
char *p, *s2;
for (p = s, n = 0; *p; p++)
if (*p == '"')
n++;
if ((s2 = malloc(p - s + n + 1)) == NULL)
return (NULL);
for (p = s2; *s; s++, p++) {
if ((*p = *s) == '"')
*(++p) = '"';
}
*p = '\0';
return (s2);
}
/* setup server socket for specified address family */
/* if af is PF_UNSPEC more than one socket may be returned */
/* the returned list is dynamically allocated, so caller needs to free it */
static int *
socksetup(int af, char *bindname, const char *bindport)
{
struct addrinfo hints, *res, *r;
int error, maxs, *s, *socks;
const int on = 1;
memset(&hints, 0, sizeof(hints));
hints.ai_flags = AI_PASSIVE;
hints.ai_family = af;
hints.ai_socktype = SOCK_STREAM;
error = getaddrinfo(bindname, bindport, &hints, &res);
if (error) {
syslog(LOG_ERR, "%s", gai_strerror(error));
if (error == EAI_SYSTEM)
syslog(LOG_ERR, "%s", strerror(errno));
return NULL;
}
/* Count max number of sockets we may open */
for (maxs = 0, r = res; r; r = r->ai_next, maxs++)
;
socks = malloc((maxs + 1) * sizeof(int));
if (!socks) {
freeaddrinfo(res);
syslog(LOG_ERR, "couldn't allocate memory for sockets");
return NULL;
}
*socks = 0; /* num of sockets counter at start of array */
s = socks + 1;
for (r = res; r; r = r->ai_next) {
*s = socket(r->ai_family, r->ai_socktype, r->ai_protocol);
if (*s < 0) {
syslog(LOG_DEBUG, "control socket: %m");
continue;
}
if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR,
&on, sizeof(on)) < 0)
syslog(LOG_WARNING,
"control setsockopt (SO_REUSEADDR): %m");
if (r->ai_family == AF_INET6) {
if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY,
&on, sizeof(on)) < 0)
syslog(LOG_WARNING,
"control setsockopt (IPV6_V6ONLY): %m");
}
if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) {
syslog(LOG_DEBUG, "control bind: %m");
close(*s);
continue;
}
(*socks)++;
s++;
}
if (res)
freeaddrinfo(res);
if (*socks == 0) {
syslog(LOG_ERR, "control socket: Couldn't bind to any socket");
free(socks);
return NULL;
}
return(socks);
}
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