1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #if 0
33 #ifndef lint
34 static char copyright[] =
35 "@(#) Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994\n\
36 The Regents of the University of California. All rights reserved.\n";
37 #endif /* not lint */
38 #endif
39
40 #ifndef lint
41 #if 0
42 static char sccsid[] = "@(#)ftpd.c 8.4 (Berkeley) 4/16/94";
43 #endif
44 #endif /* not lint */
45
46 #include <sys/cdefs.h>
47 /*
48 * FTP server.
49 */
50 #include <sys/param.h>
51 #include <sys/ioctl.h>
52 #include <sys/mman.h>
53 #include <sys/socket.h>
54 #include <sys/stat.h>
55 #include <sys/time.h>
56 #include <sys/wait.h>
57
58 #include <netinet/in.h>
59 #include <netinet/in_systm.h>
60 #include <netinet/ip.h>
61 #include <netinet/tcp.h>
62
63 #define FTP_NAMES
64 #include <arpa/ftp.h>
65 #include <arpa/inet.h>
66 #include <arpa/telnet.h>
67
68 #include <ctype.h>
69 #include <dirent.h>
70 #include <err.h>
71 #include <errno.h>
72 #include <fcntl.h>
73 #include <glob.h>
74 #include <limits.h>
75 #include <netdb.h>
76 #include <pwd.h>
77 #include <grp.h>
78 #ifdef HAVE_LIBOPIE
79 #include <opie.h>
80 #endif
81 #include <signal.h>
82 #include <stdint.h>
83 #include <stdio.h>
84 #include <stdlib.h>
85 #include <string.h>
86 #include <syslog.h>
87 #include <time.h>
88 #include <unistd.h>
89 #include <libutil.h>
90 #ifdef LOGIN_CAP
91 #include <login_cap.h>
92 #endif
93
94 #ifdef USE_PAM
95 #include <security/pam_appl.h>
96 #endif
97
98 #ifdef __HAIKU__
99 #include <shadow.h>
100 #endif
101
102 #include "pathnames.h"
103 #include "extern.h"
104
105 #include <stdarg.h>
106
107 static char version[] = "Version 6.00LS";
108 #undef main
109
110 union sockunion ctrl_addr;
111 union sockunion data_source;
112 union sockunion data_dest;
113 union sockunion his_addr;
114 union sockunion pasv_addr;
115
116 int daemon_mode;
117 int data;
118 int dataport;
119 int hostinfo = 1; /* print host-specific info in messages */
120 int logged_in;
121 struct passwd *pw;
122 char *homedir;
123 int ftpdebug;
124 int timeout = 900; /* timeout after 15 minutes of inactivity */
125 int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */
126 int logging;
127 int restricted_data_ports = 1;
128 int paranoid = 1; /* be extra careful about security */
129 int anon_only = 0; /* Only anonymous ftp allowed */
130 int assumeutf8 = 0; /* Assume that server file names are in UTF-8 */
131 int guest;
132 int dochroot;
133 char *chrootdir;
134 int dowtmp = 1;
135 int stats;
136 int statfd = -1;
137 int type;
138 int form;
139 int stru; /* avoid C keyword */
140 int mode;
141 int usedefault = 1; /* for data transfers */
142 int pdata = -1; /* for passive mode */
143 int readonly = 0; /* Server is in readonly mode. */
144 int noepsv = 0; /* EPSV command is disabled. */
145 int noretr = 0; /* RETR command is disabled. */
146 int noguestretr = 0; /* RETR command is disabled for anon users. */
147 int noguestmkd = 0; /* MKD command is disabled for anon users. */
148 int noguestmod = 1; /* anon users may not modify existing files. */
149 int use_blacklist = 0;
150
151 off_t file_size;
152 off_t byte_count;
153 #if !defined(CMASK) || CMASK == 0
154 #undef CMASK
155 #define CMASK 027
156 #endif
157 int defumask = CMASK; /* default umask value */
158 char tmpline[7];
159 char *hostname;
160 int epsvall = 0;
161
162 #ifdef VIRTUAL_HOSTING
163 char *ftpuser;
164
165 static struct ftphost {
166 struct ftphost *next;
167 struct addrinfo *hostinfo;
168 char *hostname;
169 char *anonuser;
170 char *statfile;
171 char *welcome;
172 char *loginmsg;
173 } *thishost, *firsthost;
174
175 #endif
176 char remotehost[NI_MAXHOST];
177 char *ident = NULL;
178
179 static char wtmpid[20];
180
181 #ifdef USE_PAM
182 static int auth_pam(struct passwd**, const char*);
183 pam_handle_t *pamh = NULL;
184 #endif
185
186 #ifdef HAVE_LIBOPIE
187 static struct opie opiedata;
188 static char opieprompt[OPIE_CHALLENGE_MAX+1];
189 #endif
190 static int pwok;
191
192 char *pid_file = NULL; /* means default location to pidfile(3) */
193
194 /*
195 * Limit number of pathnames that glob can return.
196 * A limit of 0 indicates the number of pathnames is unlimited.
197 */
198 #define MAXGLOBARGS 16384
199 #
200
201 /*
202 * Timeout intervals for retrying connections
203 * to hosts that don't accept PORT cmds. This
204 * is a kludge, but given the problems with TCP...
205 */
206 #define SWAITMAX 90 /* wait at most 90 seconds */
207 #define SWAITINT 5 /* interval between retries */
208
209 int swaitmax = SWAITMAX;
210 int swaitint = SWAITINT;
211
212 #ifdef SETPROCTITLE
213 char proctitle[LINE_MAX]; /* initial part of title */
214 #endif /* SETPROCTITLE */
215
216 #define LOGCMD(cmd, file) logcmd((cmd), (file), NULL, -1)
217 #define LOGCMD2(cmd, file1, file2) logcmd((cmd), (file1), (file2), -1)
218 #define LOGBYTES(cmd, file, cnt) logcmd((cmd), (file), NULL, (cnt))
219
220 static volatile sig_atomic_t recvurg;
221 static int transflag; /* NB: for debugging only */
222
223 #define STARTXFER flagxfer(1)
224 #define ENDXFER flagxfer(0)
225
226 #define START_UNSAFE maskurg(1)
227 #define END_UNSAFE maskurg(0)
228
229 /* It's OK to put an `else' clause after this macro. */
230 #define CHECKOOB(action) \
231 if (recvurg) { \
232 recvurg = 0; \
233 if (myoob()) { \
234 ENDXFER; \
235 action; \
236 } \
237 }
238
239 #ifdef VIRTUAL_HOSTING
240 static void inithosts(int);
241 static void selecthost(union sockunion *);
242 #endif
243 static void ack(char *);
244 static void sigurg(int);
245 static void maskurg(int);
246 static void flagxfer(int);
247 static int myoob(void);
248 static int checkuser(char *, char *, int, char **, int *);
249 static FILE *dataconn(char *, off_t, char *);
250 static void dolog(struct sockaddr *);
251 static void end_login(void);
252 static FILE *getdatasock(char *);
253 static int guniquefd(char *, char **);
254 static void lostconn(int);
255 static void sigquit(int);
256 static int receive_data(FILE *, FILE *);
257 static int send_data(FILE *, FILE *, size_t, off_t, int);
258 static struct passwd *
259 sgetpwnam(char *);
260 static char *sgetsave(char *);
261 static void reapchild(int);
262 static void appendf(char **, char *, ...) __printflike(2, 3);
263 static void logcmd(char *, char *, char *, off_t);
264 static void logxfer(char *, off_t, time_t);
265 static char *doublequote(char *);
266 static int *socksetup(int, char *, const char *);
267
268 int
main(int argc,char * argv[],char ** envp)269 main(int argc, char *argv[], char **envp)
270 {
271 socklen_t addrlen;
272 int ch, on = 1, tos, s = STDIN_FILENO;
273 char *cp, line[LINE_MAX];
274 FILE *fd;
275 char *bindname = NULL;
276 const char *bindport = "ftp";
277 int family = AF_UNSPEC;
278 struct sigaction sa;
279
280 tzset(); /* in case no timezone database in ~ftp */
281 sigemptyset(&sa.sa_mask);
282 sa.sa_flags = SA_RESTART;
283
284 /*
285 * Prevent diagnostic messages from appearing on stderr.
286 * We run as a daemon or from inetd; in both cases, there's
287 * more reason in logging to syslog.
288 */
289 (void) freopen(_PATH_DEVNULL, "w", stderr);
290 opterr = 0;
291
292 /*
293 * LOG_NDELAY sets up the logging connection immediately,
294 * necessary for anonymous ftp's that chroot and can't do it later.
295 */
296 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP);
297
298 while ((ch = getopt(argc, argv,
299 "468a:ABdDEhlmMoOp:P:rRSt:T:u:UvW")) != -1) {
300 switch (ch) {
301 case '4':
302 family = (family == AF_INET6) ? AF_UNSPEC : AF_INET;
303 break;
304
305 case '6':
306 family = (family == AF_INET) ? AF_UNSPEC : AF_INET6;
307 break;
308
309 case '8':
310 assumeutf8 = 1;
311 break;
312
313 case 'a':
314 bindname = optarg;
315 break;
316
317 case 'A':
318 anon_only = 1;
319 break;
320
321 case 'B':
322 #ifdef USE_BLACKLIST
323 use_blacklist = 1;
324 #else
325 syslog(LOG_WARNING, "not compiled with USE_BLACKLIST support");
326 #endif
327 break;
328
329 case 'd':
330 ftpdebug++;
331 break;
332
333 case 'D':
334 daemon_mode++;
335 break;
336
337 case 'E':
338 noepsv = 1;
339 break;
340
341 case 'h':
342 hostinfo = 0;
343 break;
344
345 case 'l':
346 logging++; /* > 1 == extra logging */
347 break;
348
349 case 'm':
350 noguestmod = 0;
351 break;
352
353 case 'M':
354 noguestmkd = 1;
355 break;
356
357 case 'o':
358 noretr = 1;
359 break;
360
361 case 'O':
362 noguestretr = 1;
363 break;
364
365 case 'p':
366 pid_file = optarg;
367 break;
368
369 case 'P':
370 bindport = optarg;
371 break;
372
373 case 'r':
374 readonly = 1;
375 break;
376
377 case 'R':
378 paranoid = 0;
379 break;
380
381 case 'S':
382 stats++;
383 break;
384
385 case 't':
386 timeout = atoi(optarg);
387 if (maxtimeout < timeout)
388 maxtimeout = timeout;
389 break;
390
391 case 'T':
392 maxtimeout = atoi(optarg);
393 if (timeout > maxtimeout)
394 timeout = maxtimeout;
395 break;
396
397 case 'u':
398 {
399 long val = 0;
400
401 val = strtol(optarg, &optarg, 8);
402 if (*optarg != '\0' || val < 0)
403 syslog(LOG_WARNING, "bad value for -u");
404 else
405 defumask = val;
406 break;
407 }
408 case 'U':
409 restricted_data_ports = 0;
410 break;
411
412 case 'v':
413 ftpdebug++;
414 break;
415
416 case 'W':
417 dowtmp = 0;
418 break;
419
420 default:
421 syslog(LOG_WARNING, "unknown flag -%c ignored", optopt);
422 break;
423 }
424 }
425
426 /* handle filesize limit gracefully */
427 sa.sa_handler = SIG_IGN;
428 (void)sigaction(SIGXFSZ, &sa, NULL);
429
430 if (daemon_mode) {
431 int *ctl_sock, fd, maxfd = -1, nfds, i;
432 fd_set defreadfds, readfds;
433 pid_t pid;
434 struct pidfh *pfh;
435
436 if ((pfh = pidfile_open(pid_file, 0600, &pid)) == NULL) {
437 if (errno == EEXIST) {
438 syslog(LOG_ERR, "%s already running, pid %d",
439 getprogname(), (int)pid);
440 exit(1);
441 }
442 syslog(LOG_WARNING, "pidfile_open: %m");
443 }
444
445 /*
446 * Detach from parent.
447 */
448 if (daemon(1, 1) < 0) {
449 syslog(LOG_ERR, "failed to become a daemon");
450 exit(1);
451 }
452
453 if (pfh != NULL && pidfile_write(pfh) == -1)
454 syslog(LOG_WARNING, "pidfile_write: %m");
455
456 sa.sa_handler = reapchild;
457 (void)sigaction(SIGCHLD, &sa, NULL);
458
459 #ifdef VIRTUAL_HOSTING
460 inithosts(family);
461 #endif
462
463 /*
464 * Open a socket, bind it to the FTP port, and start
465 * listening.
466 */
467 ctl_sock = socksetup(family, bindname, bindport);
468 if (ctl_sock == NULL)
469 exit(1);
470
471 FD_ZERO(&defreadfds);
472 for (i = 1; i <= *ctl_sock; i++) {
473 FD_SET(ctl_sock[i], &defreadfds);
474 if (listen(ctl_sock[i], 32) < 0) {
475 syslog(LOG_ERR, "control listen: %m");
476 exit(1);
477 }
478 if (maxfd < ctl_sock[i])
479 maxfd = ctl_sock[i];
480 }
481
482 /*
483 * Loop forever accepting connection requests and forking off
484 * children to handle them.
485 */
486 while (1) {
487 FD_COPY(&defreadfds, &readfds);
488 nfds = select(maxfd + 1, &readfds, NULL, NULL, 0);
489 if (nfds <= 0) {
490 if (nfds < 0 && errno != EINTR)
491 syslog(LOG_WARNING, "select: %m");
492 continue;
493 }
494
495 pid = -1;
496 for (i = 1; i <= *ctl_sock; i++)
497 if (FD_ISSET(ctl_sock[i], &readfds)) {
498 addrlen = sizeof(his_addr);
499 fd = accept(ctl_sock[i],
500 (struct sockaddr *)&his_addr,
501 &addrlen);
502 if (fd == -1) {
503 syslog(LOG_WARNING,
504 "accept: %m");
505 continue;
506 }
507 switch (pid = fork()) {
508 case 0:
509 /* child */
510 (void) dup2(fd, s);
511 (void) dup2(fd, STDOUT_FILENO);
512 (void) close(fd);
513 for (i = 1; i <= *ctl_sock; i++)
514 close(ctl_sock[i]);
515 if (pfh != NULL)
516 pidfile_close(pfh);
517 goto gotchild;
518 case -1:
519 syslog(LOG_WARNING, "fork: %m");
520 /* FALLTHROUGH */
521 default:
522 close(fd);
523 }
524 }
525 }
526 } else {
527 addrlen = sizeof(his_addr);
528 if (getpeername(s, (struct sockaddr *)&his_addr, &addrlen) < 0) {
529 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]);
530 exit(1);
531 }
532
533 #ifdef VIRTUAL_HOSTING
534 if (his_addr.su_family == AF_INET6 &&
535 IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr))
536 family = AF_INET;
537 else
538 family = his_addr.su_family;
539 inithosts(family);
540 #endif
541 }
542
543 gotchild:
544 sa.sa_handler = SIG_DFL;
545 (void)sigaction(SIGCHLD, &sa, NULL);
546
547 sa.sa_handler = sigurg;
548 sa.sa_flags = 0; /* don't restart syscalls for SIGURG */
549 (void)sigaction(SIGURG, &sa, NULL);
550
551 sigfillset(&sa.sa_mask); /* block all signals in handler */
552 sa.sa_flags = SA_RESTART;
553 sa.sa_handler = sigquit;
554 (void)sigaction(SIGHUP, &sa, NULL);
555 (void)sigaction(SIGINT, &sa, NULL);
556 (void)sigaction(SIGQUIT, &sa, NULL);
557 (void)sigaction(SIGTERM, &sa, NULL);
558
559 sa.sa_handler = lostconn;
560 (void)sigaction(SIGPIPE, &sa, NULL);
561
562 addrlen = sizeof(ctrl_addr);
563 if (getsockname(s, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) {
564 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]);
565 exit(1);
566 }
567 dataport = ntohs(ctrl_addr.su_port) - 1; /* as per RFC 959 */
568 #ifdef VIRTUAL_HOSTING
569 /* select our identity from virtual host table */
570 selecthost(&ctrl_addr);
571 #endif
572 #ifdef IP_TOS
573 if (ctrl_addr.su_family == AF_INET)
574 {
575 tos = IPTOS_LOWDELAY;
576 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0)
577 syslog(LOG_WARNING, "control setsockopt (IP_TOS): %m");
578 }
579 #endif
580 /*
581 * Disable Nagle on the control channel so that we don't have to wait
582 * for peer's ACK before issuing our next reply.
583 */
584 if (setsockopt(s, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0)
585 syslog(LOG_WARNING, "control setsockopt (TCP_NODELAY): %m");
586
587 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1);
588
589 (void)snprintf(wtmpid, sizeof(wtmpid), "%xftpd", getpid());
590
591 /* Try to handle urgent data inline */
592 #ifdef SO_OOBINLINE
593 if (setsockopt(s, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)) < 0)
594 syslog(LOG_WARNING, "control setsockopt (SO_OOBINLINE): %m");
595 #endif
596
597 #ifdef F_SETOWN
598 if (fcntl(s, F_SETOWN, getpid()) == -1)
599 syslog(LOG_ERR, "fcntl F_SETOWN: %m");
600 #endif
601 dolog((struct sockaddr *)&his_addr);
602 /*
603 * Set up default state
604 */
605 data = -1;
606 type = TYPE_A;
607 form = FORM_N;
608 stru = STRU_F;
609 mode = MODE_S;
610 tmpline[0] = '\0';
611
612 /* If logins are disabled, print out the message. */
613 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) {
614 while (fgets(line, sizeof(line), fd) != NULL) {
615 if ((cp = strchr(line, '\n')) != NULL)
616 *cp = '\0';
617 lreply(530, "%s", line);
618 }
619 (void) fflush(stdout);
620 (void) fclose(fd);
621 reply(530, "System not available.");
622 exit(0);
623 }
624 #ifdef VIRTUAL_HOSTING
625 fd = fopen(thishost->welcome, "r");
626 #else
627 fd = fopen(_PATH_FTPWELCOME, "r");
628 #endif
629 if (fd != NULL) {
630 while (fgets(line, sizeof(line), fd) != NULL) {
631 if ((cp = strchr(line, '\n')) != NULL)
632 *cp = '\0';
633 lreply(220, "%s", line);
634 }
635 (void) fflush(stdout);
636 (void) fclose(fd);
637 /* reply(220,) must follow */
638 }
639 #ifndef VIRTUAL_HOSTING
640 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL)
641 fatalerror("Ran out of memory.");
642 if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0)
643 hostname[0] = '\0';
644 hostname[MAXHOSTNAMELEN - 1] = '\0';
645 #endif
646 if (hostinfo)
647 reply(220, "%s FTP server (%s) ready.", hostname, version);
648 else
649 reply(220, "FTP server ready.");
650 for (;;)
651 (void) yyparse();
652 /* NOTREACHED */
653 }
654
655 static void
lostconn(int signo)656 lostconn(int signo)
657 {
658
659 if (ftpdebug)
660 syslog(LOG_DEBUG, "lost connection");
661 dologout(1);
662 }
663
664 static void
sigquit(int signo)665 sigquit(int signo)
666 {
667
668 syslog(LOG_ERR, "got signal %d", signo);
669 dologout(1);
670 }
671
672 #ifdef VIRTUAL_HOSTING
673 /*
674 * read in virtual host tables (if they exist)
675 */
676
677 static void
inithosts(int family)678 inithosts(int family)
679 {
680 int insert;
681 size_t len;
682 FILE *fp;
683 char *cp, *mp, *line;
684 char *hostname;
685 char *vhost, *anonuser, *statfile, *welcome, *loginmsg;
686 struct ftphost *hrp, *lhrp;
687 struct addrinfo hints, *res, *ai;
688
689 /*
690 * Fill in the default host information
691 */
692 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL)
693 fatalerror("Ran out of memory.");
694 if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0)
695 hostname[0] = '\0';
696 hostname[MAXHOSTNAMELEN - 1] = '\0';
697 if ((hrp = malloc(sizeof(struct ftphost))) == NULL)
698 fatalerror("Ran out of memory.");
699 hrp->hostname = hostname;
700 hrp->hostinfo = NULL;
701
702 memset(&hints, 0, sizeof(hints));
703 hints.ai_flags = AI_PASSIVE;
704 hints.ai_family = family;
705 hints.ai_socktype = SOCK_STREAM;
706 if (getaddrinfo(hrp->hostname, NULL, &hints, &res) == 0)
707 hrp->hostinfo = res;
708 hrp->statfile = _PATH_FTPDSTATFILE;
709 hrp->welcome = _PATH_FTPWELCOME;
710 hrp->loginmsg = _PATH_FTPLOGINMESG;
711 hrp->anonuser = "ftp";
712 hrp->next = NULL;
713 thishost = firsthost = lhrp = hrp;
714 if ((fp = fopen(_PATH_FTPHOSTS, "r")) != NULL) {
715 int addrsize, gothost;
716 void *addr;
717 struct hostent *hp;
718
719 while ((line = fgetln(fp, &len)) != NULL) {
720 int i, hp_error;
721
722 /* skip comments */
723 if (line[0] == '#')
724 continue;
725 if (line[len - 1] == '\n') {
726 line[len - 1] = '\0';
727 mp = NULL;
728 } else {
729 if ((mp = malloc(len + 1)) == NULL)
730 fatalerror("Ran out of memory.");
731 memcpy(mp, line, len);
732 mp[len] = '\0';
733 line = mp;
734 }
735 cp = strtok(line, " \t");
736 /* skip empty lines */
737 if (cp == NULL)
738 goto nextline;
739 vhost = cp;
740
741 /* set defaults */
742 anonuser = "ftp";
743 statfile = _PATH_FTPDSTATFILE;
744 welcome = _PATH_FTPWELCOME;
745 loginmsg = _PATH_FTPLOGINMESG;
746
747 /*
748 * Preparse the line so we can use its info
749 * for all the addresses associated with
750 * the virtual host name.
751 * Field 0, the virtual host name, is special:
752 * it's already parsed off and will be strdup'ed
753 * later, after we know its canonical form.
754 */
755 for (i = 1; i < 5 && (cp = strtok(NULL, " \t")); i++)
756 if (*cp != '-' && (cp = strdup(cp)))
757 switch (i) {
758 case 1: /* anon user permissions */
759 anonuser = cp;
760 break;
761 case 2: /* statistics file */
762 statfile = cp;
763 break;
764 case 3: /* welcome message */
765 welcome = cp;
766 break;
767 case 4: /* login message */
768 loginmsg = cp;
769 break;
770 default: /* programming error */
771 abort();
772 /* NOTREACHED */
773 }
774
775 hints.ai_flags = AI_PASSIVE;
776 hints.ai_family = family;
777 hints.ai_socktype = SOCK_STREAM;
778 if (getaddrinfo(vhost, NULL, &hints, &res) != 0)
779 goto nextline;
780 for (ai = res; ai != NULL && ai->ai_addr != NULL;
781 ai = ai->ai_next) {
782
783 gothost = 0;
784 for (hrp = firsthost; hrp != NULL; hrp = hrp->next) {
785 struct addrinfo *hi;
786
787 for (hi = hrp->hostinfo; hi != NULL;
788 hi = hi->ai_next)
789 if (hi->ai_addrlen == ai->ai_addrlen &&
790 memcmp(hi->ai_addr,
791 ai->ai_addr,
792 ai->ai_addr->sa_len) == 0) {
793 gothost++;
794 break;
795 }
796 if (gothost)
797 break;
798 }
799 if (hrp == NULL) {
800 if ((hrp = malloc(sizeof(struct ftphost))) == NULL)
801 goto nextline;
802 hrp->hostname = NULL;
803 insert = 1;
804 } else {
805 if (hrp->hostinfo && hrp->hostinfo != res)
806 freeaddrinfo(hrp->hostinfo);
807 insert = 0; /* host already in the chain */
808 }
809 hrp->hostinfo = res;
810
811 /*
812 * determine hostname to use.
813 * force defined name if there is a valid alias
814 * otherwise fallback to primary hostname
815 */
816 /* XXX: getaddrinfo() can't do alias check */
817 switch(hrp->hostinfo->ai_family) {
818 case AF_INET:
819 addr = &((struct sockaddr_in *)hrp->hostinfo->ai_addr)->sin_addr;
820 addrsize = sizeof(struct in_addr);
821 break;
822 case AF_INET6:
823 addr = &((struct sockaddr_in6 *)hrp->hostinfo->ai_addr)->sin6_addr;
824 addrsize = sizeof(struct in6_addr);
825 break;
826 default:
827 /* should not reach here */
828 freeaddrinfo(hrp->hostinfo);
829 if (insert)
830 free(hrp); /*not in chain, can free*/
831 else
832 hrp->hostinfo = NULL; /*mark as blank*/
833 goto nextline;
834 /* NOTREACHED */
835 }
836 if ((hp = getipnodebyaddr(addr, addrsize,
837 hrp->hostinfo->ai_family,
838 &hp_error)) != NULL) {
839 if (strcmp(vhost, hp->h_name) != 0) {
840 if (hp->h_aliases == NULL)
841 vhost = hp->h_name;
842 else {
843 i = 0;
844 while (hp->h_aliases[i] &&
845 strcmp(vhost, hp->h_aliases[i]) != 0)
846 ++i;
847 if (hp->h_aliases[i] == NULL)
848 vhost = hp->h_name;
849 }
850 }
851 }
852 if (hrp->hostname &&
853 strcmp(hrp->hostname, vhost) != 0) {
854 free(hrp->hostname);
855 hrp->hostname = NULL;
856 }
857 if (hrp->hostname == NULL &&
858 (hrp->hostname = strdup(vhost)) == NULL) {
859 freeaddrinfo(hrp->hostinfo);
860 hrp->hostinfo = NULL; /* mark as blank */
861 if (hp)
862 freehostent(hp);
863 goto nextline;
864 }
865 hrp->anonuser = anonuser;
866 hrp->statfile = statfile;
867 hrp->welcome = welcome;
868 hrp->loginmsg = loginmsg;
869 if (insert) {
870 hrp->next = NULL;
871 lhrp->next = hrp;
872 lhrp = hrp;
873 }
874 if (hp)
875 freehostent(hp);
876 }
877 nextline:
878 if (mp)
879 free(mp);
880 }
881 (void) fclose(fp);
882 }
883 }
884
885 static void
selecthost(union sockunion * su)886 selecthost(union sockunion *su)
887 {
888 struct ftphost *hrp;
889 u_int16_t port;
890 #ifdef INET6
891 struct in6_addr *mapped_in6 = NULL;
892 #endif
893 struct addrinfo *hi;
894
895 #ifdef INET6
896 /*
897 * XXX IPv4 mapped IPv6 addr consideraton,
898 * specified in rfc2373.
899 */
900 if (su->su_family == AF_INET6 &&
901 IN6_IS_ADDR_V4MAPPED(&su->su_sin6.sin6_addr))
902 mapped_in6 = &su->su_sin6.sin6_addr;
903 #endif
904
905 hrp = thishost = firsthost; /* default */
906 port = su->su_port;
907 su->su_port = 0;
908 while (hrp != NULL) {
909 for (hi = hrp->hostinfo; hi != NULL; hi = hi->ai_next) {
910 if (memcmp(su, hi->ai_addr, hi->ai_addrlen) == 0) {
911 thishost = hrp;
912 goto found;
913 }
914 #ifdef INET6
915 /* XXX IPv4 mapped IPv6 addr consideraton */
916 if (hi->ai_addr->sa_family == AF_INET && mapped_in6 != NULL &&
917 (memcmp(&mapped_in6->s6_addr[12],
918 &((struct sockaddr_in *)hi->ai_addr)->sin_addr,
919 sizeof(struct in_addr)) == 0)) {
920 thishost = hrp;
921 goto found;
922 }
923 #endif
924 }
925 hrp = hrp->next;
926 }
927 found:
928 su->su_port = port;
929 /* setup static variables as appropriate */
930 hostname = thishost->hostname;
931 ftpuser = thishost->anonuser;
932 }
933 #endif
934
935 /*
936 * Helper function for sgetpwnam().
937 */
938 static char *
sgetsave(char * s)939 sgetsave(char *s)
940 {
941 char *new = malloc(strlen(s) + 1);
942
943 if (new == NULL) {
944 reply(421, "Ran out of memory.");
945 dologout(1);
946 /* NOTREACHED */
947 }
948 (void) strcpy(new, s);
949 return (new);
950 }
951
952 /*
953 * Save the result of a getpwnam. Used for USER command, since
954 * the data returned must not be clobbered by any other command
955 * (e.g., globbing).
956 * NB: The data returned by sgetpwnam() will remain valid until
957 * the next call to this function. Its difference from getpwnam()
958 * is that sgetpwnam() is known to be called from ftpd code only.
959 */
960 static struct passwd *
sgetpwnam(char * name)961 sgetpwnam(char *name)
962 {
963 static struct passwd save;
964 struct passwd *p;
965 #ifdef __HAIKU__
966 struct spwd *sp = NULL;
967 #endif
968
969 if ((p = getpwnam(name)) == NULL)
970 return (p);
971 #ifdef __HAIKU__
972 if (strcmp(p->pw_passwd, "x") == 0) {
973 if ((sp = getspnam(name)) == NULL)
974 return (p);
975 }
976 #endif
977 if (save.pw_name) {
978 free(save.pw_name);
979 free(save.pw_passwd);
980 free(save.pw_gecos);
981 free(save.pw_dir);
982 free(save.pw_shell);
983 }
984 save = *p;
985 save.pw_name = sgetsave(p->pw_name);
986 #ifdef __HAIKU__
987 if (sp)
988 save.pw_passwd = sgetsave(sp->sp_pwdp);
989 else
990 #endif
991 save.pw_passwd = sgetsave(p->pw_passwd);
992 save.pw_gecos = sgetsave(p->pw_gecos);
993 save.pw_dir = sgetsave(p->pw_dir);
994 save.pw_shell = sgetsave(p->pw_shell);
995 return (&save);
996 }
997
998 static int login_attempts; /* number of failed login attempts */
999 static int askpasswd; /* had user command, ask for passwd */
1000 static char curname[MAXLOGNAME]; /* current USER name */
1001
1002 /*
1003 * USER command.
1004 * Sets global passwd pointer pw if named account exists and is acceptable;
1005 * sets askpasswd if a PASS command is expected. If logged in previously,
1006 * need to reset state. If name is "ftp" or "anonymous", the name is not in
1007 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return.
1008 * If account doesn't exist, ask for passwd anyway. Otherwise, check user
1009 * requesting login privileges. Disallow anyone who does not have a standard
1010 * shell as returned by getusershell(). Disallow anyone mentioned in the file
1011 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided.
1012 */
1013 void
user(char * name)1014 user(char *name)
1015 {
1016 int ecode;
1017 char *cp, *shell;
1018
1019 if (logged_in) {
1020 if (guest) {
1021 reply(530, "Can't change user from guest login.");
1022 return;
1023 } else if (dochroot) {
1024 reply(530, "Can't change user from chroot user.");
1025 return;
1026 }
1027 end_login();
1028 }
1029
1030 guest = 0;
1031 #ifdef VIRTUAL_HOSTING
1032 pw = sgetpwnam(thishost->anonuser);
1033 #else
1034 pw = sgetpwnam("ftp");
1035 #endif
1036 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) {
1037 if (checkuser(_PATH_FTPUSERS, "ftp", 0, NULL, &ecode) ||
1038 (ecode != 0 && ecode != ENOENT))
1039 reply(530, "User %s access denied.", name);
1040 else if (checkuser(_PATH_FTPUSERS, "anonymous", 0, NULL, &ecode) ||
1041 (ecode != 0 && ecode != ENOENT))
1042 reply(530, "User %s access denied.", name);
1043 else if (pw != NULL) {
1044 guest = 1;
1045 askpasswd = 1;
1046 reply(331,
1047 "Guest login ok, send your email address as password.");
1048 } else
1049 reply(530, "User %s unknown.", name);
1050 if (!askpasswd && logging)
1051 syslog(LOG_NOTICE,
1052 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost);
1053 return;
1054 }
1055 if (anon_only != 0) {
1056 reply(530, "Sorry, only anonymous ftp allowed.");
1057 return;
1058 }
1059
1060 if ((pw = sgetpwnam(name))) {
1061 if ((shell = pw->pw_shell) == NULL || *shell == 0)
1062 shell = _PATH_BSHELL;
1063 setusershell();
1064 while ((cp = getusershell()) != NULL)
1065 if (strcmp(cp, shell) == 0)
1066 break;
1067 endusershell();
1068
1069 if (cp == NULL ||
1070 (checkuser(_PATH_FTPUSERS, name, 1, NULL, &ecode) ||
1071 (ecode != 0 && ecode != ENOENT))) {
1072 reply(530, "User %s access denied.", name);
1073 if (logging)
1074 syslog(LOG_NOTICE,
1075 "FTP LOGIN REFUSED FROM %s, %s",
1076 remotehost, name);
1077 pw = NULL;
1078 return;
1079 }
1080 }
1081 if (logging)
1082 strlcpy(curname, name, sizeof(curname));
1083
1084 pwok = 0;
1085 #ifdef USE_PAM
1086 /* XXX Kluge! The conversation mechanism needs to be fixed. */
1087 #endif
1088 #ifdef HAVE_LIBOPIE
1089 if (opiechallenge(&opiedata, name, opieprompt) == 0) {
1090 pwok = (pw != NULL) &&
1091 opieaccessfile(remotehost) &&
1092 opiealways(pw->pw_dir);
1093 reply(331, "Response to %s %s for %s.",
1094 opieprompt, pwok ? "requested" : "required", name);
1095 } else
1096 #endif
1097 {
1098 pwok = 1;
1099 reply(331, "Password required for %s.", name);
1100 }
1101 askpasswd = 1;
1102 /*
1103 * Delay before reading passwd after first failed
1104 * attempt to slow down passwd-guessing programs.
1105 */
1106 if (login_attempts)
1107 sleep(login_attempts);
1108 }
1109
1110 /*
1111 * Check if a user is in the file "fname",
1112 * return a pointer to a malloc'd string with the rest
1113 * of the matching line in "residue" if not NULL.
1114 */
1115 static int
checkuser(char * fname,char * name,int pwset,char ** residue,int * ecode)1116 checkuser(char *fname, char *name, int pwset, char **residue, int *ecode)
1117 {
1118 FILE *fd;
1119 int found = 0;
1120 size_t len;
1121 char *line, *mp, *p;
1122
1123 if (ecode != NULL)
1124 *ecode = 0;
1125 if ((fd = fopen(fname, "r")) != NULL) {
1126 while (!found && (line = fgetln(fd, &len)) != NULL) {
1127 /* skip comments */
1128 if (line[0] == '#')
1129 continue;
1130 if (line[len - 1] == '\n') {
1131 line[len - 1] = '\0';
1132 mp = NULL;
1133 } else {
1134 if ((mp = malloc(len + 1)) == NULL)
1135 fatalerror("Ran out of memory.");
1136 memcpy(mp, line, len);
1137 mp[len] = '\0';
1138 line = mp;
1139 }
1140 /* avoid possible leading and trailing whitespace */
1141 p = strtok(line, " \t");
1142 /* skip empty lines */
1143 if (p == NULL)
1144 goto nextline;
1145 /*
1146 * if first chr is '@', check group membership
1147 */
1148 if (p[0] == '@') {
1149 int i = 0;
1150 struct group *grp;
1151
1152 if (p[1] == '\0') /* single @ matches anyone */
1153 found = 1;
1154 else {
1155 if ((grp = getgrnam(p+1)) == NULL)
1156 goto nextline;
1157 /*
1158 * Check user's default group
1159 */
1160 if (pwset && grp->gr_gid == pw->pw_gid)
1161 found = 1;
1162 /*
1163 * Check supplementary groups
1164 */
1165 while (!found && grp->gr_mem[i])
1166 found = strcmp(name,
1167 grp->gr_mem[i++])
1168 == 0;
1169 }
1170 }
1171 /*
1172 * Otherwise, just check for username match
1173 */
1174 else
1175 found = strcmp(p, name) == 0;
1176 /*
1177 * Save the rest of line to "residue" if matched
1178 */
1179 if (found && residue) {
1180 if ((p = strtok(NULL, "")) != NULL)
1181 p += strspn(p, " \t");
1182 if (p && *p) {
1183 if ((*residue = strdup(p)) == NULL)
1184 fatalerror("Ran out of memory.");
1185 } else
1186 *residue = NULL;
1187 }
1188 nextline:
1189 if (mp)
1190 free(mp);
1191 }
1192 (void) fclose(fd);
1193 } else if (ecode != NULL)
1194 *ecode = errno;
1195 return (found);
1196 }
1197
1198 /*
1199 * Terminate login as previous user, if any, resetting state;
1200 * used when USER command is given or login fails.
1201 */
1202 static void
end_login(void)1203 end_login(void)
1204 {
1205 #ifdef USE_PAM
1206 int e;
1207 #endif
1208
1209 (void) seteuid(0);
1210 #ifdef LOGIN_CAP
1211 setusercontext(NULL, getpwuid(0), 0, LOGIN_SETALL & ~(LOGIN_SETLOGIN |
1212 LOGIN_SETUSER | LOGIN_SETGROUP | LOGIN_SETPATH |
1213 LOGIN_SETENV));
1214 #endif
1215 if (logged_in && dowtmp)
1216 ftpd_logwtmp(wtmpid, NULL, NULL);
1217 pw = NULL;
1218 #ifdef USE_PAM
1219 if (pamh) {
1220 if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS)
1221 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e));
1222 if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS)
1223 syslog(LOG_ERR, "pam_close_session: %s", pam_strerror(pamh, e));
1224 if ((e = pam_end(pamh, e)) != PAM_SUCCESS)
1225 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e));
1226 pamh = NULL;
1227 }
1228 #endif
1229 logged_in = 0;
1230 guest = 0;
1231 dochroot = 0;
1232 }
1233
1234 #ifdef USE_PAM
1235
1236 /*
1237 * the following code is stolen from imap-uw PAM authentication module and
1238 * login.c
1239 */
1240 #define COPY_STRING(s) (s ? strdup(s) : NULL)
1241
1242 struct cred_t {
1243 const char *uname; /* user name */
1244 const char *pass; /* password */
1245 };
1246 typedef struct cred_t cred_t;
1247
1248 static int
auth_conv(int num_msg,const struct pam_message ** msg,struct pam_response ** resp,void * appdata)1249 auth_conv(int num_msg, const struct pam_message **msg,
1250 struct pam_response **resp, void *appdata)
1251 {
1252 int i;
1253 cred_t *cred = (cred_t *) appdata;
1254 struct pam_response *reply;
1255
1256 reply = calloc(num_msg, sizeof *reply);
1257 if (reply == NULL)
1258 return PAM_BUF_ERR;
1259
1260 for (i = 0; i < num_msg; i++) {
1261 switch (msg[i]->msg_style) {
1262 case PAM_PROMPT_ECHO_ON: /* assume want user name */
1263 reply[i].resp_retcode = PAM_SUCCESS;
1264 reply[i].resp = COPY_STRING(cred->uname);
1265 /* PAM frees resp. */
1266 break;
1267 case PAM_PROMPT_ECHO_OFF: /* assume want password */
1268 reply[i].resp_retcode = PAM_SUCCESS;
1269 reply[i].resp = COPY_STRING(cred->pass);
1270 /* PAM frees resp. */
1271 break;
1272 case PAM_TEXT_INFO:
1273 case PAM_ERROR_MSG:
1274 reply[i].resp_retcode = PAM_SUCCESS;
1275 reply[i].resp = NULL;
1276 break;
1277 default: /* unknown message style */
1278 free(reply);
1279 return PAM_CONV_ERR;
1280 }
1281 }
1282
1283 *resp = reply;
1284 return PAM_SUCCESS;
1285 }
1286
1287 /*
1288 * Attempt to authenticate the user using PAM. Returns 0 if the user is
1289 * authenticated, or 1 if not authenticated. If some sort of PAM system
1290 * error occurs (e.g., the "/etc/pam.conf" file is missing) then this
1291 * function returns -1. This can be used as an indication that we should
1292 * fall back to a different authentication mechanism.
1293 */
1294 static int
auth_pam(struct passwd ** ppw,const char * pass)1295 auth_pam(struct passwd **ppw, const char *pass)
1296 {
1297 const char *tmpl_user;
1298 const void *item;
1299 int rval;
1300 int e;
1301 cred_t auth_cred = { (*ppw)->pw_name, pass };
1302 struct pam_conv conv = { &auth_conv, &auth_cred };
1303
1304 e = pam_start("ftpd", (*ppw)->pw_name, &conv, &pamh);
1305 if (e != PAM_SUCCESS) {
1306 /*
1307 * In OpenPAM, it's OK to pass NULL to pam_strerror()
1308 * if context creation has failed in the first place.
1309 */
1310 syslog(LOG_ERR, "pam_start: %s", pam_strerror(NULL, e));
1311 return -1;
1312 }
1313
1314 e = pam_set_item(pamh, PAM_RHOST, remotehost);
1315 if (e != PAM_SUCCESS) {
1316 syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s",
1317 pam_strerror(pamh, e));
1318 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) {
1319 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e));
1320 }
1321 pamh = NULL;
1322 return -1;
1323 }
1324
1325 e = pam_authenticate(pamh, 0);
1326 switch (e) {
1327 case PAM_SUCCESS:
1328 /*
1329 * With PAM we support the concept of a "template"
1330 * user. The user enters a login name which is
1331 * authenticated by PAM, usually via a remote service
1332 * such as RADIUS or TACACS+. If authentication
1333 * succeeds, a different but related "template" name
1334 * is used for setting the credentials, shell, and
1335 * home directory. The name the user enters need only
1336 * exist on the remote authentication server, but the
1337 * template name must be present in the local password
1338 * database.
1339 *
1340 * This is supported by two various mechanisms in the
1341 * individual modules. However, from the application's
1342 * point of view, the template user is always passed
1343 * back as a changed value of the PAM_USER item.
1344 */
1345 if ((e = pam_get_item(pamh, PAM_USER, &item)) ==
1346 PAM_SUCCESS) {
1347 tmpl_user = (const char *) item;
1348 if (strcmp((*ppw)->pw_name, tmpl_user) != 0)
1349 *ppw = getpwnam(tmpl_user);
1350 } else
1351 syslog(LOG_ERR, "Couldn't get PAM_USER: %s",
1352 pam_strerror(pamh, e));
1353 rval = 0;
1354 break;
1355
1356 case PAM_AUTH_ERR:
1357 case PAM_USER_UNKNOWN:
1358 case PAM_MAXTRIES:
1359 rval = 1;
1360 break;
1361
1362 default:
1363 syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e));
1364 rval = -1;
1365 break;
1366 }
1367
1368 if (rval == 0) {
1369 e = pam_acct_mgmt(pamh, 0);
1370 if (e != PAM_SUCCESS) {
1371 syslog(LOG_ERR, "pam_acct_mgmt: %s",
1372 pam_strerror(pamh, e));
1373 rval = 1;
1374 }
1375 }
1376
1377 if (rval != 0) {
1378 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) {
1379 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e));
1380 }
1381 pamh = NULL;
1382 }
1383 return rval;
1384 }
1385
1386 #endif /* USE_PAM */
1387
1388 void
pass(char * passwd)1389 pass(char *passwd)
1390 {
1391 int rval, ecode;
1392 FILE *fd;
1393 #ifdef LOGIN_CAP
1394 login_cap_t *lc = NULL;
1395 #endif
1396 #ifdef USE_PAM
1397 int e;
1398 #endif
1399 char *residue = NULL;
1400 char *xpasswd;
1401
1402 if (logged_in || askpasswd == 0) {
1403 reply(503, "Login with USER first.");
1404 return;
1405 }
1406 askpasswd = 0;
1407 if (!guest) { /* "ftp" is only account allowed no password */
1408 if (pw == NULL) {
1409 rval = 1; /* failure below */
1410 goto skip;
1411 }
1412 #ifdef USE_PAM
1413 rval = auth_pam(&pw, passwd);
1414 if (rval >= 0) {
1415 opieunlock();
1416 goto skip;
1417 }
1418 #endif
1419 #ifdef HAVE_LIBOPIE
1420 if (opieverify(&opiedata, passwd) == 0)
1421 xpasswd = pw->pw_passwd;
1422 else
1423 #endif
1424 if (pwok) {
1425 xpasswd = crypt(passwd, pw->pw_passwd);
1426 if (passwd[0] == '\0' && pw->pw_passwd[0] != '\0')
1427 xpasswd = ":";
1428 } else {
1429 rval = 1;
1430 goto skip;
1431 }
1432 rval = strcmp(pw->pw_passwd, xpasswd);
1433 #if (!defined(__BEOS__) && !defined(__HAIKU__))
1434 if (pw->pw_expire && time(NULL) >= pw->pw_expire)
1435 rval = 1; /* failure */
1436 #endif
1437 skip:
1438 /*
1439 * If rval == 1, the user failed the authentication check
1440 * above. If rval == 0, either PAM or local authentication
1441 * succeeded.
1442 */
1443 if (rval) {
1444 reply(530, "Login incorrect.");
1445 if (logging) {
1446 syslog(LOG_NOTICE,
1447 "FTP LOGIN FAILED FROM %s",
1448 remotehost);
1449 syslog(LOG_AUTHPRIV | LOG_NOTICE,
1450 "FTP LOGIN FAILED FROM %s, %s",
1451 remotehost, curname);
1452 }
1453 pw = NULL;
1454 if (login_attempts++ >= 5) {
1455 syslog(LOG_NOTICE,
1456 "repeated login failures from %s",
1457 remotehost);
1458 exit(0);
1459 }
1460 return;
1461 }
1462 }
1463 login_attempts = 0; /* this time successful */
1464 if (setegid(pw->pw_gid) < 0) {
1465 reply(550, "Can't set gid.");
1466 return;
1467 }
1468 /* May be overridden by login.conf */
1469 (void) umask(defumask);
1470 #ifdef LOGIN_CAP
1471 if ((lc = login_getpwclass(pw)) != NULL) {
1472 char remote_ip[NI_MAXHOST];
1473
1474 if (getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len,
1475 remote_ip, sizeof(remote_ip) - 1, NULL, 0,
1476 NI_NUMERICHOST))
1477 *remote_ip = 0;
1478 remote_ip[sizeof(remote_ip) - 1] = 0;
1479 if (!auth_hostok(lc, remotehost, remote_ip)) {
1480 syslog(LOG_INFO|LOG_AUTH,
1481 "FTP LOGIN FAILED (HOST) as %s: permission denied.",
1482 pw->pw_name);
1483 reply(530, "Permission denied.");
1484 pw = NULL;
1485 return;
1486 }
1487 if (!auth_timeok(lc, time(NULL))) {
1488 reply(530, "Login not available right now.");
1489 pw = NULL;
1490 return;
1491 }
1492 }
1493 setusercontext(lc, pw, 0,
1494 LOGIN_SETLOGIN|LOGIN_SETGROUP|LOGIN_SETPRIORITY|
1495 LOGIN_SETRESOURCES|LOGIN_SETUMASK|LOGIN_SETMAC);
1496 #elif !(defined(__BEOS__) || defined(__HAIKU__))
1497 setlogin(pw->pw_name);
1498 (void) initgroups(pw->pw_name, pw->pw_gid);
1499 #endif
1500
1501 #ifdef USE_PAM
1502 if (pamh) {
1503 if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) {
1504 syslog(LOG_ERR, "pam_open_session: %s", pam_strerror(pamh, e));
1505 } else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED)) != PAM_SUCCESS) {
1506 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e));
1507 }
1508 }
1509 #endif
1510
1511 dochroot =
1512 checkuser(_PATH_FTPCHROOT, pw->pw_name, 1, &residue, &ecode)
1513 #ifdef LOGIN_CAP /* Allow login.conf configuration as well */
1514 || login_getcapbool(lc, "ftp-chroot", 0)
1515 #endif
1516 ;
1517 /*
1518 * It is possible that checkuser() failed to open the chroot file.
1519 * If this is the case, report that logins are un-available, since we
1520 * have no way of checking whether or not the user should be chrooted.
1521 * We ignore ENOENT since it is not required that this file be present.
1522 */
1523 if (ecode != 0 && ecode != ENOENT) {
1524 reply(530, "Login not available right now.");
1525 return;
1526 }
1527 chrootdir = NULL;
1528
1529 /* Disable wtmp logging when chrooting. */
1530 if (dochroot || guest)
1531 dowtmp = 0;
1532 if (dowtmp)
1533 ftpd_logwtmp(wtmpid, pw->pw_name,
1534 (struct sockaddr *)&his_addr);
1535 logged_in = 1;
1536
1537 #ifdef LOGIN_CAP
1538 setusercontext(lc, pw, 0, LOGIN_SETRESOURCES);
1539 #endif
1540
1541 if (guest && stats && statfd < 0) {
1542 #ifdef VIRTUAL_HOSTING
1543 statfd = open(thishost->statfile, O_WRONLY|O_APPEND);
1544 #else
1545 statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND);
1546 #endif
1547 if (statfd < 0)
1548 stats = 0;
1549 }
1550
1551 #if (!defined(__BEOS__) && !defined(__HAIKU__))
1552 /*
1553 * For a chrooted local user,
1554 * a) see whether ftpchroot(5) specifies a chroot directory,
1555 * b) extract the directory pathname from the line,
1556 * c) expand it to the absolute pathname if necessary.
1557 */
1558 if (dochroot && residue &&
1559 (chrootdir = strtok(residue, " \t")) != NULL) {
1560 if (chrootdir[0] != '/')
1561 asprintf(&chrootdir, "%s/%s", pw->pw_dir, chrootdir);
1562 else
1563 chrootdir = strdup(chrootdir); /* make it permanent */
1564 if (chrootdir == NULL)
1565 fatalerror("Ran out of memory.");
1566 }
1567 #endif
1568 if (guest || dochroot) {
1569 #if (!defined(__BEOS__) && !defined(__HAIKU__))
1570 /*
1571 * If no chroot directory set yet, use the login directory.
1572 * Copy it so it can be modified while pw->pw_dir stays intact.
1573 */
1574 if (chrootdir == NULL &&
1575 (chrootdir = strdup(pw->pw_dir)) == NULL)
1576 fatalerror("Ran out of memory.");
1577 /*
1578 * Check for the "/chroot/./home" syntax,
1579 * separate the chroot and home directory pathnames.
1580 */
1581 if ((homedir = strstr(chrootdir, "/./")) != NULL) {
1582 *(homedir++) = '\0'; /* wipe '/' */
1583 homedir++; /* skip '.' */
1584 } else {
1585 /*
1586 * We MUST do a chdir() after the chroot. Otherwise
1587 * the old current directory will be accessible as "."
1588 * outside the new root!
1589 */
1590 homedir = "/";
1591 }
1592 /*
1593 * Finally, do chroot()
1594 */
1595 if (chroot(chrootdir) < 0) {
1596 reply(550, "Can't change root.");
1597 goto bad;
1598 }
1599 #else
1600 homedir = "/";
1601 #endif
1602 } else /* real user w/o chroot */
1603 homedir = pw->pw_dir;
1604 /*
1605 * Set euid *before* doing chdir() so
1606 * a) the user won't be carried to a directory that he couldn't reach
1607 * on his own due to no permission to upper path components,
1608 * b) NFS mounted homedirs w/restrictive permissions will be accessible
1609 * (uid 0 has no root power over NFS if not mapped explicitly.)
1610 */
1611 if (seteuid(pw->pw_uid) < 0) {
1612 if (guest || dochroot) {
1613 fatalerror("Can't set uid.");
1614 } else {
1615 reply(550, "Can't set uid.");
1616 goto bad;
1617 }
1618 }
1619 /*
1620 * Do not allow the session to live if we're chroot()'ed and chdir()
1621 * fails. Otherwise the chroot jail can be escaped.
1622 */
1623 if (chdir(homedir) < 0) {
1624 if (guest || dochroot) {
1625 fatalerror("Can't change to base directory.");
1626 } else {
1627 if (chdir("/") < 0) {
1628 reply(550, "Root is inaccessible.");
1629 goto bad;
1630 }
1631 lreply(230, "No directory! Logging in with home=/.");
1632 }
1633 }
1634
1635 /*
1636 * Display a login message, if it exists.
1637 * N.B. reply(230,) must follow the message.
1638 */
1639 #ifdef VIRTUAL_HOSTING
1640 fd = fopen(thishost->loginmsg, "r");
1641 #else
1642 fd = fopen(_PATH_FTPLOGINMESG, "r");
1643 #endif
1644 if (fd != NULL) {
1645 char *cp, line[LINE_MAX];
1646
1647 while (fgets(line, sizeof(line), fd) != NULL) {
1648 if ((cp = strchr(line, '\n')) != NULL)
1649 *cp = '\0';
1650 lreply(230, "%s", line);
1651 }
1652 (void) fflush(stdout);
1653 (void) fclose(fd);
1654 }
1655 if (guest) {
1656 if (ident != NULL)
1657 free(ident);
1658 ident = strdup(passwd);
1659 if (ident == NULL)
1660 fatalerror("Ran out of memory.");
1661
1662 reply(230, "Guest login ok, access restrictions apply.");
1663 #ifdef SETPROCTITLE
1664 #ifdef VIRTUAL_HOSTING
1665 if (thishost != firsthost)
1666 snprintf(proctitle, sizeof(proctitle),
1667 "%s: anonymous(%s)/%s", remotehost, hostname,
1668 passwd);
1669 else
1670 #endif
1671 snprintf(proctitle, sizeof(proctitle),
1672 "%s: anonymous/%s", remotehost, passwd);
1673 setproctitle("%s", proctitle);
1674 #endif /* SETPROCTITLE */
1675 if (logging)
1676 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s",
1677 remotehost, passwd);
1678 } else {
1679 if (dochroot)
1680 reply(230, "User %s logged in, "
1681 "access restrictions apply.", pw->pw_name);
1682 else
1683 reply(230, "User %s logged in.", pw->pw_name);
1684
1685 #ifdef SETPROCTITLE
1686 snprintf(proctitle, sizeof(proctitle),
1687 "%s: user/%s", remotehost, pw->pw_name);
1688 setproctitle("%s", proctitle);
1689 #endif /* SETPROCTITLE */
1690 if (logging)
1691 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s",
1692 remotehost, pw->pw_name);
1693 }
1694 if (logging && (guest || dochroot))
1695 syslog(LOG_INFO, "session root changed to %s", chrootdir);
1696 #ifdef LOGIN_CAP
1697 login_close(lc);
1698 #endif
1699 if (residue)
1700 free(residue);
1701 return;
1702 bad:
1703 /* Forget all about it... */
1704 #ifdef LOGIN_CAP
1705 login_close(lc);
1706 #endif
1707 if (residue)
1708 free(residue);
1709 end_login();
1710 }
1711
1712 void
retrieve(char * cmd,char * name)1713 retrieve(char *cmd, char *name)
1714 {
1715 FILE *fin, *dout;
1716 struct stat st;
1717 int (*closefunc)(FILE *);
1718 time_t start;
1719 char line[BUFSIZ];
1720
1721 if (cmd == 0) {
1722 fin = fopen(name, "r"), closefunc = fclose;
1723 st.st_size = 0;
1724 } else {
1725 (void) snprintf(line, sizeof(line), cmd, name);
1726 name = line;
1727 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose;
1728 st.st_size = -1;
1729 st.st_blksize = BUFSIZ;
1730 }
1731 if (fin == NULL) {
1732 if (errno != 0) {
1733 perror_reply(550, name);
1734 if (cmd == 0) {
1735 LOGCMD("get", name);
1736 }
1737 }
1738 return;
1739 }
1740 byte_count = -1;
1741 if (cmd == 0) {
1742 if (fstat(fileno(fin), &st) < 0) {
1743 perror_reply(550, name);
1744 goto done;
1745 }
1746 if (!S_ISREG(st.st_mode)) {
1747 /*
1748 * Never sending a raw directory is a workaround
1749 * for buggy clients that will attempt to RETR
1750 * a directory before listing it, e.g., Mozilla.
1751 * Preventing a guest from getting irregular files
1752 * is a simple security measure.
1753 */
1754 if (S_ISDIR(st.st_mode) || guest) {
1755 reply(550, "%s: not a plain file.", name);
1756 goto done;
1757 }
1758 st.st_size = -1;
1759 /* st.st_blksize is set for all descriptor types */
1760 }
1761 }
1762 if (restart_point) {
1763 if (type == TYPE_A) {
1764 off_t i, n;
1765 int c;
1766
1767 n = restart_point;
1768 i = 0;
1769 while (i++ < n) {
1770 if ((c=getc(fin)) == EOF) {
1771 perror_reply(550, name);
1772 goto done;
1773 }
1774 if (c == '\n')
1775 i++;
1776 }
1777 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) {
1778 perror_reply(550, name);
1779 goto done;
1780 }
1781 }
1782 dout = dataconn(name, st.st_size, "w");
1783 if (dout == NULL)
1784 goto done;
1785 time(&start);
1786 send_data(fin, dout, st.st_blksize, st.st_size,
1787 restart_point == 0 && cmd == 0 && S_ISREG(st.st_mode));
1788 if (cmd == 0 && guest && stats && byte_count > 0)
1789 logxfer(name, byte_count, start);
1790 (void) fclose(dout);
1791 data = -1;
1792 pdata = -1;
1793 done:
1794 if (cmd == 0)
1795 LOGBYTES("get", name, byte_count);
1796 (*closefunc)(fin);
1797 }
1798
1799 void
store(char * name,char * mode,int unique)1800 store(char *name, char *mode, int unique)
1801 {
1802 int fd;
1803 FILE *fout, *din;
1804 int (*closefunc)(FILE *);
1805
1806 if (*mode == 'a') { /* APPE */
1807 if (unique) {
1808 /* Programming error */
1809 syslog(LOG_ERR, "Internal: unique flag to APPE");
1810 unique = 0;
1811 }
1812 if (guest && noguestmod) {
1813 reply(550, "Appending to existing file denied.");
1814 goto err;
1815 }
1816 restart_point = 0; /* not affected by preceding REST */
1817 }
1818 if (unique) /* STOU overrides REST */
1819 restart_point = 0;
1820 if (guest && noguestmod) {
1821 if (restart_point) { /* guest STOR w/REST */
1822 reply(550, "Modifying existing file denied.");
1823 goto err;
1824 } else /* treat guest STOR as STOU */
1825 unique = 1;
1826 }
1827
1828 if (restart_point)
1829 mode = "r+"; /* so ASCII manual seek can work */
1830 if (unique) {
1831 if ((fd = guniquefd(name, &name)) < 0)
1832 goto err;
1833 fout = fdopen(fd, mode);
1834 } else
1835 fout = fopen(name, mode);
1836 closefunc = fclose;
1837 if (fout == NULL) {
1838 perror_reply(553, name);
1839 goto err;
1840 }
1841 byte_count = -1;
1842 if (restart_point) {
1843 if (type == TYPE_A) {
1844 off_t i, n;
1845 int c;
1846
1847 n = restart_point;
1848 i = 0;
1849 while (i++ < n) {
1850 if ((c=getc(fout)) == EOF) {
1851 perror_reply(550, name);
1852 goto done;
1853 }
1854 if (c == '\n')
1855 i++;
1856 }
1857 /*
1858 * We must do this seek to "current" position
1859 * because we are changing from reading to
1860 * writing.
1861 */
1862 if (fseeko(fout, 0, SEEK_CUR) < 0) {
1863 perror_reply(550, name);
1864 goto done;
1865 }
1866 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) {
1867 perror_reply(550, name);
1868 goto done;
1869 }
1870 }
1871 din = dataconn(name, -1, "r");
1872 if (din == NULL)
1873 goto done;
1874 if (receive_data(din, fout) == 0) {
1875 if (unique)
1876 reply(226, "Transfer complete (unique file name:%s).",
1877 name);
1878 else
1879 reply(226, "Transfer complete.");
1880 }
1881 (void) fclose(din);
1882 data = -1;
1883 pdata = -1;
1884 done:
1885 LOGBYTES(*mode == 'a' ? "append" : "put", name, byte_count);
1886 (*closefunc)(fout);
1887 return;
1888 err:
1889 LOGCMD(*mode == 'a' ? "append" : "put" , name);
1890 return;
1891 }
1892
1893 static FILE *
getdatasock(char * mode)1894 getdatasock(char *mode)
1895 {
1896 int on = 1, s, t, tries;
1897
1898 if (data >= 0)
1899 return (fdopen(data, mode));
1900
1901 s = socket(data_dest.su_family, SOCK_STREAM, 0);
1902 if (s < 0)
1903 goto bad;
1904 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
1905 syslog(LOG_WARNING, "data setsockopt (SO_REUSEADDR): %m");
1906 /* anchor socket to avoid multi-homing problems */
1907 data_source = ctrl_addr;
1908 data_source.su_port = htons(dataport);
1909 (void) seteuid(0);
1910 for (tries = 1; ; tries++) {
1911 /*
1912 * We should loop here since it's possible that
1913 * another ftpd instance has passed this point and is
1914 * trying to open a data connection in active mode now.
1915 * Until the other connection is opened, we'll be getting
1916 * EADDRINUSE because no SOCK_STREAM sockets in the system
1917 * can share both local and remote addresses, localIP:20
1918 * and *:* in this case.
1919 */
1920 if (bind(s, (struct sockaddr *)&data_source,
1921 data_source.su_len) >= 0)
1922 break;
1923 if (errno != EADDRINUSE || tries > 10)
1924 goto bad;
1925 sleep(tries);
1926 }
1927 (void) seteuid(pw->pw_uid);
1928 #ifdef IP_TOS
1929 if (data_source.su_family == AF_INET)
1930 {
1931 on = IPTOS_THROUGHPUT;
1932 if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, sizeof(int)) < 0)
1933 syslog(LOG_WARNING, "data setsockopt (IP_TOS): %m");
1934 }
1935 #endif
1936 #ifdef TCP_NOPUSH
1937 /*
1938 * Turn off push flag to keep sender TCP from sending short packets
1939 * at the boundaries of each write().
1940 */
1941 on = 1;
1942 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof on) < 0)
1943 syslog(LOG_WARNING, "data setsockopt (TCP_NOPUSH): %m");
1944 #endif
1945 return (fdopen(s, mode));
1946 bad:
1947 /* Return the real value of errno (close may change it) */
1948 t = errno;
1949 (void) seteuid(pw->pw_uid);
1950 (void) close(s);
1951 errno = t;
1952 return (NULL);
1953 }
1954
1955 static FILE *
dataconn(char * name,off_t size,char * mode)1956 dataconn(char *name, off_t size, char *mode)
1957 {
1958 char sizebuf[32];
1959 FILE *file;
1960 int retry = 0, tos, conerrno;
1961
1962 file_size = size;
1963 byte_count = 0;
1964 if (size != -1)
1965 (void) snprintf(sizebuf, sizeof(sizebuf),
1966 " (%jd bytes)", (intmax_t)size);
1967 else
1968 *sizebuf = '\0';
1969 if (pdata >= 0) {
1970 union sockunion from;
1971 socklen_t fromlen = ctrl_addr.su_len;
1972 int flags, s;
1973 struct timeval timeout;
1974 fd_set set;
1975
1976 FD_ZERO(&set);
1977 FD_SET(pdata, &set);
1978
1979 timeout.tv_usec = 0;
1980 timeout.tv_sec = 120;
1981
1982 /*
1983 * Granted a socket is in the blocking I/O mode,
1984 * accept() will block after a successful select()
1985 * if the selected connection dies in between.
1986 * Therefore set the non-blocking I/O flag here.
1987 */
1988 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 ||
1989 fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1)
1990 goto pdata_err;
1991 if (select(pdata+1, &set, NULL, NULL, &timeout) <= 0 ||
1992 (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0)
1993 goto pdata_err;
1994 (void) close(pdata);
1995 pdata = s;
1996 /*
1997 * Unset the inherited non-blocking I/O flag
1998 * on the child socket so stdio can work on it.
1999 */
2000 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 ||
2001 fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1)
2002 goto pdata_err;
2003 #ifdef IP_TOS
2004 if (from.su_family == AF_INET)
2005 {
2006 tos = IPTOS_THROUGHPUT;
2007 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0)
2008 syslog(LOG_WARNING, "pdata setsockopt (IP_TOS): %m");
2009 }
2010 #endif
2011 reply(150, "Opening %s mode data connection for '%s'%s.",
2012 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf);
2013 return (fdopen(pdata, mode));
2014 pdata_err:
2015 reply(425, "Can't open data connection.");
2016 (void) close(pdata);
2017 pdata = -1;
2018 return (NULL);
2019 }
2020 if (data >= 0) {
2021 reply(125, "Using existing data connection for '%s'%s.",
2022 name, sizebuf);
2023 usedefault = 1;
2024 return (fdopen(data, mode));
2025 }
2026 if (usedefault)
2027 data_dest = his_addr;
2028 usedefault = 1;
2029 do {
2030 file = getdatasock(mode);
2031 if (file == NULL) {
2032 char hostbuf[NI_MAXHOST], portbuf[NI_MAXSERV];
2033
2034 if (getnameinfo((struct sockaddr *)&data_source,
2035 data_source.su_len,
2036 hostbuf, sizeof(hostbuf) - 1,
2037 portbuf, sizeof(portbuf) - 1,
2038 NI_NUMERICHOST|NI_NUMERICSERV))
2039 *hostbuf = *portbuf = 0;
2040 hostbuf[sizeof(hostbuf) - 1] = 0;
2041 portbuf[sizeof(portbuf) - 1] = 0;
2042 reply(425, "Can't create data socket (%s,%s): %s.",
2043 hostbuf, portbuf, strerror(errno));
2044 return (NULL);
2045 }
2046 data = fileno(file);
2047 conerrno = 0;
2048 if (connect(data, (struct sockaddr *)&data_dest,
2049 data_dest.su_len) == 0)
2050 break;
2051 conerrno = errno;
2052 (void) fclose(file);
2053 data = -1;
2054 if (conerrno == EADDRINUSE) {
2055 sleep(swaitint);
2056 retry += swaitint;
2057 } else {
2058 break;
2059 }
2060 } while (retry <= swaitmax);
2061 if (conerrno != 0) {
2062 reply(425, "Can't build data connection: %s.",
2063 strerror(conerrno));
2064 return (NULL);
2065 }
2066 reply(150, "Opening %s mode data connection for '%s'%s.",
2067 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf);
2068 return (file);
2069 }
2070
2071 /*
2072 * A helper macro to avoid code duplication
2073 * in send_data() and receive_data().
2074 *
2075 * XXX We have to block SIGURG during putc() because BSD stdio
2076 * is unable to restart interrupted write operations and hence
2077 * the entire buffer contents will be lost as soon as a write()
2078 * call indicates EINTR to stdio.
2079 */
2080 #define FTPD_PUTC(ch, file, label) \
2081 do { \
2082 int ret; \
2083 \
2084 do { \
2085 START_UNSAFE; \
2086 ret = putc((ch), (file)); \
2087 END_UNSAFE; \
2088 CHECKOOB(return (-1)) \
2089 else if (ferror(file)) \
2090 goto label; \
2091 clearerr(file); \
2092 } while (ret == EOF); \
2093 } while (0)
2094
2095 /*
2096 * Transfer the contents of "instr" to "outstr" peer using the appropriate
2097 * encapsulation of the data subject to Mode, Structure, and Type.
2098 *
2099 * NB: Form isn't handled.
2100 */
2101 static int
send_data(FILE * instr,FILE * outstr,size_t blksize,off_t filesize,int isreg)2102 send_data(FILE *instr, FILE *outstr, size_t blksize, off_t filesize, int isreg)
2103 {
2104 int c, cp, filefd, netfd;
2105 char *buf;
2106
2107 STARTXFER;
2108
2109 switch (type) {
2110
2111 case TYPE_A:
2112 cp = EOF;
2113 for (;;) {
2114 c = getc(instr);
2115 CHECKOOB(return (-1))
2116 else if (c == EOF && ferror(instr))
2117 goto file_err;
2118 if (c == EOF) {
2119 if (ferror(instr)) { /* resume after OOB */
2120 clearerr(instr);
2121 continue;
2122 }
2123 if (feof(instr)) /* EOF */
2124 break;
2125 syslog(LOG_ERR, "Internal: impossible condition"
2126 " on file after getc()");
2127 goto file_err;
2128 }
2129 if (c == '\n' && cp != '\r') {
2130 FTPD_PUTC('\r', outstr, data_err);
2131 byte_count++;
2132 }
2133 FTPD_PUTC(c, outstr, data_err);
2134 byte_count++;
2135 cp = c;
2136 }
2137 #ifdef notyet /* BSD stdio isn't ready for that */
2138 while (fflush(outstr) == EOF) {
2139 CHECKOOB(return (-1))
2140 else
2141 goto data_err;
2142 clearerr(outstr);
2143 }
2144 ENDXFER;
2145 #else
2146 ENDXFER;
2147 if (fflush(outstr) == EOF)
2148 goto data_err;
2149 #endif
2150 reply(226, "Transfer complete.");
2151 return (0);
2152
2153 case TYPE_I:
2154 case TYPE_L:
2155 /*
2156 * isreg is only set if we are not doing restart and we
2157 * are sending a regular file
2158 */
2159 netfd = fileno(outstr);
2160 filefd = fileno(instr);
2161
2162 #if (!defined(__BEOS__) && !defined(__HAIKU__))
2163 if (isreg) {
2164 char *msg = "Transfer complete.";
2165 off_t cnt, offset;
2166 int err;
2167
2168 cnt = offset = 0;
2169
2170 while (filesize > 0) {
2171 err = sendfile(filefd, netfd, offset, 0,
2172 NULL, &cnt, 0);
2173 /*
2174 * Calculate byte_count before OOB processing.
2175 * It can be used in myoob() later.
2176 */
2177 byte_count += cnt;
2178 offset += cnt;
2179 filesize -= cnt;
2180 CHECKOOB(return (-1))
2181 else if (err == -1) {
2182 if (errno != EINTR &&
2183 cnt == 0 && offset == 0)
2184 goto oldway;
2185 goto data_err;
2186 }
2187 if (err == -1) /* resume after OOB */
2188 continue;
2189 /*
2190 * We hit the EOF prematurely.
2191 * Perhaps the file was externally truncated.
2192 */
2193 if (cnt == 0) {
2194 msg = "Transfer finished due to "
2195 "premature end of file.";
2196 break;
2197 }
2198 }
2199 ENDXFER;
2200 reply(226, "%s", msg);
2201 return (0);
2202 }
2203
2204 oldway:
2205 #endif /* !__BEOS__ */
2206 if ((buf = malloc(blksize)) == NULL) {
2207 ENDXFER;
2208 reply(451, "Ran out of memory.");
2209 return (-1);
2210 }
2211
2212 for (;;) {
2213 int cnt, len;
2214 char *bp;
2215
2216 cnt = read(filefd, buf, blksize);
2217 CHECKOOB(free(buf); return (-1))
2218 else if (cnt < 0) {
2219 free(buf);
2220 goto file_err;
2221 }
2222 if (cnt < 0) /* resume after OOB */
2223 continue;
2224 if (cnt == 0) /* EOF */
2225 break;
2226 for (len = cnt, bp = buf; len > 0;) {
2227 cnt = write(netfd, bp, len);
2228 CHECKOOB(free(buf); return (-1))
2229 else if (cnt < 0) {
2230 free(buf);
2231 goto data_err;
2232 }
2233 if (cnt <= 0)
2234 continue;
2235 len -= cnt;
2236 bp += cnt;
2237 byte_count += cnt;
2238 }
2239 }
2240 ENDXFER;
2241 free(buf);
2242 reply(226, "Transfer complete.");
2243 return (0);
2244 default:
2245 ENDXFER;
2246 reply(550, "Unimplemented TYPE %d in send_data.", type);
2247 return (-1);
2248 }
2249
2250 data_err:
2251 ENDXFER;
2252 perror_reply(426, "Data connection");
2253 return (-1);
2254
2255 file_err:
2256 ENDXFER;
2257 perror_reply(551, "Error on input file");
2258 return (-1);
2259 }
2260
2261 /*
2262 * Transfer data from peer to "outstr" using the appropriate encapulation of
2263 * the data subject to Mode, Structure, and Type.
2264 *
2265 * N.B.: Form isn't handled.
2266 */
2267 static int
receive_data(FILE * instr,FILE * outstr)2268 receive_data(FILE *instr, FILE *outstr)
2269 {
2270 int c, cp;
2271 int bare_lfs = 0;
2272
2273 STARTXFER;
2274
2275 switch (type) {
2276
2277 case TYPE_I:
2278 case TYPE_L:
2279 for (;;) {
2280 int cnt, len;
2281 char *bp;
2282 char buf[BUFSIZ];
2283
2284 cnt = read(fileno(instr), buf, sizeof(buf));
2285 CHECKOOB(return (-1))
2286 else if (cnt < 0)
2287 goto data_err;
2288 if (cnt < 0) /* resume after OOB */
2289 continue;
2290 if (cnt == 0) /* EOF */
2291 break;
2292 for (len = cnt, bp = buf; len > 0;) {
2293 cnt = write(fileno(outstr), bp, len);
2294 CHECKOOB(return (-1))
2295 else if (cnt < 0)
2296 goto file_err;
2297 if (cnt <= 0)
2298 continue;
2299 len -= cnt;
2300 bp += cnt;
2301 byte_count += cnt;
2302 }
2303 }
2304 ENDXFER;
2305 return (0);
2306
2307 case TYPE_E:
2308 ENDXFER;
2309 reply(553, "TYPE E not implemented.");
2310 return (-1);
2311
2312 case TYPE_A:
2313 cp = EOF;
2314 for (;;) {
2315 c = getc(instr);
2316 CHECKOOB(return (-1))
2317 else if (c == EOF && ferror(instr))
2318 goto data_err;
2319 if (c == EOF && ferror(instr)) { /* resume after OOB */
2320 clearerr(instr);
2321 continue;
2322 }
2323
2324 if (cp == '\r') {
2325 if (c != '\n')
2326 FTPD_PUTC('\r', outstr, file_err);
2327 } else
2328 if (c == '\n')
2329 bare_lfs++;
2330 if (c == '\r') {
2331 byte_count++;
2332 cp = c;
2333 continue;
2334 }
2335
2336 /* Check for EOF here in order not to lose last \r. */
2337 if (c == EOF) {
2338 if (feof(instr)) /* EOF */
2339 break;
2340 syslog(LOG_ERR, "Internal: impossible condition"
2341 " on data stream after getc()");
2342 goto data_err;
2343 }
2344
2345 byte_count++;
2346 FTPD_PUTC(c, outstr, file_err);
2347 cp = c;
2348 }
2349 #ifdef notyet /* BSD stdio isn't ready for that */
2350 while (fflush(outstr) == EOF) {
2351 CHECKOOB(return (-1))
2352 else
2353 goto file_err;
2354 clearerr(outstr);
2355 }
2356 ENDXFER;
2357 #else
2358 ENDXFER;
2359 if (fflush(outstr) == EOF)
2360 goto file_err;
2361 #endif
2362 if (bare_lfs) {
2363 lreply(226,
2364 "WARNING! %d bare linefeeds received in ASCII mode.",
2365 bare_lfs);
2366 (void)printf(" File may not have transferred correctly.\r\n");
2367 }
2368 return (0);
2369 default:
2370 ENDXFER;
2371 reply(550, "Unimplemented TYPE %d in receive_data.", type);
2372 return (-1);
2373 }
2374
2375 data_err:
2376 ENDXFER;
2377 perror_reply(426, "Data connection");
2378 return (-1);
2379
2380 file_err:
2381 ENDXFER;
2382 perror_reply(452, "Error writing to file");
2383 return (-1);
2384 }
2385
2386 void
statfilecmd(char * filename)2387 statfilecmd(char *filename)
2388 {
2389 FILE *fin;
2390 int atstart;
2391 int c, code;
2392 char line[LINE_MAX];
2393 struct stat st;
2394
2395 code = lstat(filename, &st) == 0 && S_ISDIR(st.st_mode) ? 212 : 213;
2396 (void)snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename);
2397 fin = ftpd_popen(line, "r");
2398 if (fin == NULL) {
2399 perror_reply(551, filename);
2400 return;
2401 }
2402 lreply(code, "Status of %s:", filename);
2403 atstart = 1;
2404 while ((c = getc(fin)) != EOF) {
2405 if (c == '\n') {
2406 if (ferror(stdout)){
2407 perror_reply(421, "Control connection");
2408 (void) ftpd_pclose(fin);
2409 dologout(1);
2410 /* NOTREACHED */
2411 }
2412 if (ferror(fin)) {
2413 perror_reply(551, filename);
2414 (void) ftpd_pclose(fin);
2415 return;
2416 }
2417 (void) putc('\r', stdout);
2418 }
2419 /*
2420 * RFC 959 says neutral text should be prepended before
2421 * a leading 3-digit number followed by whitespace, but
2422 * many ftp clients can be confused by any leading digits,
2423 * as a matter of fact.
2424 */
2425 if (atstart && isdigit(c))
2426 (void) putc(' ', stdout);
2427 (void) putc(c, stdout);
2428 atstart = (c == '\n');
2429 }
2430 (void) ftpd_pclose(fin);
2431 reply(code, "End of status.");
2432 }
2433
2434 void
statcmd(void)2435 statcmd(void)
2436 {
2437 union sockunion *su;
2438 u_char *a, *p;
2439 char hname[NI_MAXHOST];
2440 int ispassive;
2441
2442 if (hostinfo) {
2443 lreply(211, "%s FTP server status:", hostname);
2444 printf(" %s\r\n", version);
2445 } else
2446 lreply(211, "FTP server status:");
2447 printf(" Connected to %s", remotehost);
2448 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len,
2449 hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST)) {
2450 hname[sizeof(hname) - 1] = 0;
2451 if (strcmp(hname, remotehost) != 0)
2452 printf(" (%s)", hname);
2453 }
2454 printf("\r\n");
2455 if (logged_in) {
2456 if (guest)
2457 printf(" Logged in anonymously\r\n");
2458 else
2459 printf(" Logged in as %s\r\n", pw->pw_name);
2460 } else if (askpasswd)
2461 printf(" Waiting for password\r\n");
2462 else
2463 printf(" Waiting for user name\r\n");
2464 printf(" TYPE: %s", typenames[type]);
2465 if (type == TYPE_A || type == TYPE_E)
2466 printf(", FORM: %s", formnames[form]);
2467 if (type == TYPE_L)
2468 #if CHAR_BIT == 8
2469 printf(" %d", CHAR_BIT);
2470 #else
2471 printf(" %d", bytesize); /* need definition! */
2472 #endif
2473 printf("; STRUcture: %s; transfer MODE: %s\r\n",
2474 strunames[stru], modenames[mode]);
2475 if (data != -1)
2476 printf(" Data connection open\r\n");
2477 else if (pdata != -1) {
2478 ispassive = 1;
2479 su = &pasv_addr;
2480 goto printaddr;
2481 } else if (usedefault == 0) {
2482 ispassive = 0;
2483 su = &data_dest;
2484 printaddr:
2485 #define UC(b) (((int) b) & 0xff)
2486 if (epsvall) {
2487 printf(" EPSV only mode (EPSV ALL)\r\n");
2488 goto epsvonly;
2489 }
2490
2491 /* PORT/PASV */
2492 if (su->su_family == AF_INET) {
2493 a = (u_char *) &su->su_sin.sin_addr;
2494 p = (u_char *) &su->su_sin.sin_port;
2495 printf(" %s (%d,%d,%d,%d,%d,%d)\r\n",
2496 ispassive ? "PASV" : "PORT",
2497 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]),
2498 UC(p[0]), UC(p[1]));
2499 }
2500
2501 /* LPRT/LPSV */
2502 {
2503 int alen, af, i;
2504
2505 switch (su->su_family) {
2506 case AF_INET:
2507 a = (u_char *) &su->su_sin.sin_addr;
2508 p = (u_char *) &su->su_sin.sin_port;
2509 alen = sizeof(su->su_sin.sin_addr);
2510 af = 4;
2511 break;
2512 case AF_INET6:
2513 a = (u_char *) &su->su_sin6.sin6_addr;
2514 p = (u_char *) &su->su_sin6.sin6_port;
2515 alen = sizeof(su->su_sin6.sin6_addr);
2516 af = 6;
2517 break;
2518 default:
2519 af = 0;
2520 break;
2521 }
2522 if (af) {
2523 printf(" %s (%d,%d,", ispassive ? "LPSV" : "LPRT",
2524 af, alen);
2525 for (i = 0; i < alen; i++)
2526 printf("%d,", UC(a[i]));
2527 printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1]));
2528 }
2529 }
2530
2531 epsvonly:;
2532 /* EPRT/EPSV */
2533 {
2534 int af;
2535
2536 switch (su->su_family) {
2537 case AF_INET:
2538 af = 1;
2539 break;
2540 case AF_INET6:
2541 af = 2;
2542 break;
2543 default:
2544 af = 0;
2545 break;
2546 }
2547 if (af) {
2548 union sockunion tmp;
2549
2550 tmp = *su;
2551 if (tmp.su_family == AF_INET6)
2552 tmp.su_sin6.sin6_scope_id = 0;
2553 if (!getnameinfo((struct sockaddr *)&tmp, tmp.su_len,
2554 hname, sizeof(hname) - 1, NULL, 0,
2555 NI_NUMERICHOST)) {
2556 hname[sizeof(hname) - 1] = 0;
2557 printf(" %s |%d|%s|%d|\r\n",
2558 ispassive ? "EPSV" : "EPRT",
2559 af, hname, htons(tmp.su_port));
2560 }
2561 }
2562 }
2563 #undef UC
2564 } else
2565 printf(" No data connection\r\n");
2566 reply(211, "End of status.");
2567 }
2568
2569 void
fatalerror(char * s)2570 fatalerror(char *s)
2571 {
2572
2573 reply(451, "Error in server: %s", s);
2574 reply(221, "Closing connection due to server error.");
2575 dologout(0);
2576 /* NOTREACHED */
2577 }
2578
2579 void
reply(int n,const char * fmt,...)2580 reply(int n, const char *fmt, ...)
2581 {
2582 va_list ap;
2583
2584 (void)printf("%d ", n);
2585 va_start(ap, fmt);
2586 (void)vprintf(fmt, ap);
2587 va_end(ap);
2588 (void)printf("\r\n");
2589 (void)fflush(stdout);
2590 if (ftpdebug) {
2591 syslog(LOG_DEBUG, "<--- %d ", n);
2592 va_start(ap, fmt);
2593 vsyslog(LOG_DEBUG, fmt, ap);
2594 va_end(ap);
2595 }
2596 }
2597
2598 void
lreply(int n,const char * fmt,...)2599 lreply(int n, const char *fmt, ...)
2600 {
2601 va_list ap;
2602
2603 (void)printf("%d- ", n);
2604 va_start(ap, fmt);
2605 (void)vprintf(fmt, ap);
2606 va_end(ap);
2607 (void)printf("\r\n");
2608 (void)fflush(stdout);
2609 if (ftpdebug) {
2610 syslog(LOG_DEBUG, "<--- %d- ", n);
2611 va_start(ap, fmt);
2612 vsyslog(LOG_DEBUG, fmt, ap);
2613 va_end(ap);
2614 }
2615 }
2616
2617 static void
ack(char * s)2618 ack(char *s)
2619 {
2620
2621 reply(250, "%s command successful.", s);
2622 }
2623
2624 void
nack(char * s)2625 nack(char *s)
2626 {
2627
2628 reply(502, "%s command not implemented.", s);
2629 }
2630
2631 /* ARGSUSED */
2632 void
yyerror(char * s)2633 yyerror(char *s)
2634 {
2635 char *cp;
2636
2637 if ((cp = strchr(cbuf,'\n')))
2638 *cp = '\0';
2639 reply(500, "%s: command not understood.", cbuf);
2640 }
2641
2642 void
delete(char * name)2643 delete(char *name)
2644 {
2645 struct stat st;
2646
2647 LOGCMD("delete", name);
2648 if (lstat(name, &st) < 0) {
2649 perror_reply(550, name);
2650 return;
2651 }
2652 if (S_ISDIR(st.st_mode)) {
2653 if (rmdir(name) < 0) {
2654 perror_reply(550, name);
2655 return;
2656 }
2657 goto done;
2658 }
2659 if (guest && noguestmod) {
2660 reply(550, "Operation not permitted.");
2661 return;
2662 }
2663 if (unlink(name) < 0) {
2664 perror_reply(550, name);
2665 return;
2666 }
2667 done:
2668 ack("DELE");
2669 }
2670
2671 void
cwd(char * path)2672 cwd(char *path)
2673 {
2674
2675 if (chdir(path) < 0)
2676 perror_reply(550, path);
2677 else
2678 ack("CWD");
2679 }
2680
2681 void
makedir(char * name)2682 makedir(char *name)
2683 {
2684 char *s;
2685
2686 LOGCMD("mkdir", name);
2687 if (guest && noguestmkd)
2688 reply(550, "Operation not permitted.");
2689 else if (mkdir(name, 0777) < 0)
2690 perror_reply(550, name);
2691 else {
2692 if ((s = doublequote(name)) == NULL)
2693 fatalerror("Ran out of memory.");
2694 reply(257, "\"%s\" directory created.", s);
2695 free(s);
2696 }
2697 }
2698
2699 void
removedir(char * name)2700 removedir(char *name)
2701 {
2702
2703 LOGCMD("rmdir", name);
2704 if (rmdir(name) < 0)
2705 perror_reply(550, name);
2706 else
2707 ack("RMD");
2708 }
2709
2710 void
pwd(void)2711 pwd(void)
2712 {
2713 char *s, path[MAXPATHLEN + 1];
2714
2715 if (getcwd(path, sizeof(path)) == NULL)
2716 perror_reply(550, "Get current directory");
2717 else {
2718 if ((s = doublequote(path)) == NULL)
2719 fatalerror("Ran out of memory.");
2720 reply(257, "\"%s\" is current directory.", s);
2721 free(s);
2722 }
2723 }
2724
2725 char *
renamefrom(char * name)2726 renamefrom(char *name)
2727 {
2728 struct stat st;
2729
2730 if (guest && noguestmod) {
2731 reply(550, "Operation not permitted.");
2732 return (NULL);
2733 }
2734 if (lstat(name, &st) < 0) {
2735 perror_reply(550, name);
2736 return (NULL);
2737 }
2738 reply(350, "File exists, ready for destination name.");
2739 return (name);
2740 }
2741
2742 void
renamecmd(char * from,char * to)2743 renamecmd(char *from, char *to)
2744 {
2745 struct stat st;
2746
2747 LOGCMD2("rename", from, to);
2748
2749 if (guest && (stat(to, &st) == 0)) {
2750 reply(550, "%s: permission denied.", to);
2751 return;
2752 }
2753
2754 if (rename(from, to) < 0)
2755 perror_reply(550, "rename");
2756 else
2757 ack("RNTO");
2758 }
2759
2760 static void
dolog(struct sockaddr * who)2761 dolog(struct sockaddr *who)
2762 {
2763 char who_name[NI_MAXHOST];
2764
2765 realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len);
2766 remotehost[sizeof(remotehost) - 1] = 0;
2767 if (getnameinfo(who, who->sa_len,
2768 who_name, sizeof(who_name) - 1, NULL, 0, NI_NUMERICHOST))
2769 *who_name = 0;
2770 who_name[sizeof(who_name) - 1] = 0;
2771
2772 #ifdef SETPROCTITLE
2773 #ifdef VIRTUAL_HOSTING
2774 if (thishost != firsthost)
2775 snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)",
2776 remotehost, hostname);
2777 else
2778 #endif
2779 snprintf(proctitle, sizeof(proctitle), "%s: connected",
2780 remotehost);
2781 setproctitle("%s", proctitle);
2782 #endif /* SETPROCTITLE */
2783
2784 if (logging) {
2785 #ifdef VIRTUAL_HOSTING
2786 if (thishost != firsthost)
2787 syslog(LOG_INFO, "connection from %s (%s) to %s",
2788 remotehost, who_name, hostname);
2789 else
2790 #endif
2791 syslog(LOG_INFO, "connection from %s (%s)",
2792 remotehost, who_name);
2793 }
2794 }
2795
2796 /*
2797 * Record logout in wtmp file
2798 * and exit with supplied status.
2799 */
2800 void
dologout(int status)2801 dologout(int status)
2802 {
2803
2804 if (logged_in && dowtmp) {
2805 (void) seteuid(0);
2806 #ifdef LOGIN_CAP
2807 setusercontext(NULL, getpwuid(0), 0, LOGIN_SETALL & ~(LOGIN_SETLOGIN |
2808 LOGIN_SETUSER | LOGIN_SETGROUP | LOGIN_SETPATH |
2809 LOGIN_SETENV));
2810 #endif
2811 ftpd_logwtmp(wtmpid, NULL, NULL);
2812 }
2813 /* beware of flushing buffers after a SIGPIPE */
2814 _exit(status);
2815 }
2816
2817 static void
sigurg(int signo)2818 sigurg(int signo)
2819 {
2820
2821 recvurg = 1;
2822 }
2823
2824 static void
maskurg(int flag)2825 maskurg(int flag)
2826 {
2827 int oerrno;
2828 sigset_t sset;
2829
2830 if (!transflag) {
2831 syslog(LOG_ERR, "Internal: maskurg() while no transfer");
2832 return;
2833 }
2834 oerrno = errno;
2835 sigemptyset(&sset);
2836 sigaddset(&sset, SIGURG);
2837 sigprocmask(flag ? SIG_BLOCK : SIG_UNBLOCK, &sset, NULL);
2838 errno = oerrno;
2839 }
2840
2841 static void
flagxfer(int flag)2842 flagxfer(int flag)
2843 {
2844
2845 if (flag) {
2846 if (transflag)
2847 syslog(LOG_ERR, "Internal: flagxfer(1): "
2848 "transfer already under way");
2849 transflag = 1;
2850 maskurg(0);
2851 recvurg = 0;
2852 } else {
2853 if (!transflag)
2854 syslog(LOG_ERR, "Internal: flagxfer(0): "
2855 "no active transfer");
2856 maskurg(1);
2857 transflag = 0;
2858 }
2859 }
2860
2861 /*
2862 * Returns 0 if OK to resume or -1 if abort requested.
2863 */
2864 static int
myoob(void)2865 myoob(void)
2866 {
2867 char *cp;
2868 int ret;
2869
2870 if (!transflag) {
2871 syslog(LOG_ERR, "Internal: myoob() while no transfer");
2872 return (0);
2873 }
2874 cp = tmpline;
2875 ret = get_line(cp, 7, stdin);
2876 if (ret == -1) {
2877 reply(221, "You could at least say goodbye.");
2878 dologout(0);
2879 } else if (ret == -2) {
2880 /* Ignore truncated command. */
2881 return (0);
2882 }
2883 upper(cp);
2884 if (strcmp(cp, "ABOR\r\n") == 0) {
2885 tmpline[0] = '\0';
2886 reply(426, "Transfer aborted. Data connection closed.");
2887 reply(226, "Abort successful.");
2888 return (-1);
2889 }
2890 if (strcmp(cp, "STAT\r\n") == 0) {
2891 tmpline[0] = '\0';
2892 if (file_size != -1)
2893 reply(213, "Status: %jd of %jd bytes transferred.",
2894 (intmax_t)byte_count, (intmax_t)file_size);
2895 else
2896 reply(213, "Status: %jd bytes transferred.",
2897 (intmax_t)byte_count);
2898 }
2899 return (0);
2900 }
2901
2902 /*
2903 * Note: a response of 425 is not mentioned as a possible response to
2904 * the PASV command in RFC959. However, it has been blessed as
2905 * a legitimate response by Jon Postel in a telephone conversation
2906 * with Rick Adams on 25 Jan 89.
2907 */
2908 void
passive(void)2909 passive(void)
2910 {
2911 socklen_t len;
2912 int on;
2913 char *p, *a;
2914
2915 if (pdata >= 0) /* close old port if one set */
2916 close(pdata);
2917
2918 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0);
2919 if (pdata < 0) {
2920 perror_reply(425, "Can't open passive connection");
2921 return;
2922 }
2923 on = 1;
2924 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
2925 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m");
2926
2927 (void) seteuid(0);
2928
2929 #ifdef IP_PORTRANGE
2930 if (ctrl_addr.su_family == AF_INET) {
2931 on = restricted_data_ports ? IP_PORTRANGE_HIGH
2932 : IP_PORTRANGE_DEFAULT;
2933
2934 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE,
2935 &on, sizeof(on)) < 0)
2936 goto pasv_error;
2937 }
2938 #endif
2939 #ifdef IPV6_PORTRANGE
2940 if (ctrl_addr.su_family == AF_INET6) {
2941 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH
2942 : IPV6_PORTRANGE_DEFAULT;
2943
2944 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE,
2945 &on, sizeof(on)) < 0)
2946 goto pasv_error;
2947 }
2948 #endif
2949
2950 pasv_addr = ctrl_addr;
2951 pasv_addr.su_port = 0;
2952 if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0)
2953 goto pasv_error;
2954
2955 (void) seteuid(pw->pw_uid);
2956
2957 len = sizeof(pasv_addr);
2958 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0)
2959 goto pasv_error;
2960 if (listen(pdata, 1) < 0)
2961 goto pasv_error;
2962 if (pasv_addr.su_family == AF_INET)
2963 a = (char *) &pasv_addr.su_sin.sin_addr;
2964 else if (pasv_addr.su_family == AF_INET6 &&
2965 IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr))
2966 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12];
2967 else
2968 goto pasv_error;
2969
2970 p = (char *) &pasv_addr.su_port;
2971
2972 #define UC(b) (((int) b) & 0xff)
2973
2974 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]),
2975 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1]));
2976 return;
2977
2978 pasv_error:
2979 (void) seteuid(pw->pw_uid);
2980 (void) close(pdata);
2981 pdata = -1;
2982 perror_reply(425, "Can't open passive connection");
2983 return;
2984 }
2985
2986 /*
2987 * Long Passive defined in RFC 1639.
2988 * 228 Entering Long Passive Mode
2989 * (af, hal, h1, h2, h3,..., pal, p1, p2...)
2990 */
2991
2992 void
long_passive(char * cmd,int pf)2993 long_passive(char *cmd, int pf)
2994 {
2995 socklen_t len;
2996 int on;
2997 char *p, *a;
2998
2999 if (pdata >= 0) /* close old port if one set */
3000 close(pdata);
3001
3002 if (pf != PF_UNSPEC) {
3003 if (ctrl_addr.su_family != pf) {
3004 switch (ctrl_addr.su_family) {
3005 case AF_INET:
3006 pf = 1;
3007 break;
3008 case AF_INET6:
3009 pf = 2;
3010 break;
3011 default:
3012 pf = 0;
3013 break;
3014 }
3015 /*
3016 * XXX
3017 * only EPRT/EPSV ready clients will understand this
3018 */
3019 if (strcmp(cmd, "EPSV") == 0 && pf) {
3020 reply(522, "Network protocol mismatch, "
3021 "use (%d)", pf);
3022 } else
3023 reply(501, "Network protocol mismatch."); /*XXX*/
3024
3025 return;
3026 }
3027 }
3028
3029 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0);
3030 if (pdata < 0) {
3031 perror_reply(425, "Can't open passive connection");
3032 return;
3033 }
3034 on = 1;
3035 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
3036 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m");
3037
3038 (void) seteuid(0);
3039
3040 pasv_addr = ctrl_addr;
3041 pasv_addr.su_port = 0;
3042 len = pasv_addr.su_len;
3043
3044 #ifdef IP_PORTRANGE
3045 if (ctrl_addr.su_family == AF_INET) {
3046 on = restricted_data_ports ? IP_PORTRANGE_HIGH
3047 : IP_PORTRANGE_DEFAULT;
3048
3049 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE,
3050 &on, sizeof(on)) < 0)
3051 goto pasv_error;
3052 }
3053 #endif
3054 #ifdef IPV6_PORTRANGE
3055 if (ctrl_addr.su_family == AF_INET6) {
3056 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH
3057 : IPV6_PORTRANGE_DEFAULT;
3058
3059 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE,
3060 &on, sizeof(on)) < 0)
3061 goto pasv_error;
3062 }
3063 #endif
3064
3065 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0)
3066 goto pasv_error;
3067
3068 (void) seteuid(pw->pw_uid);
3069
3070 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0)
3071 goto pasv_error;
3072 if (listen(pdata, 1) < 0)
3073 goto pasv_error;
3074
3075 #define UC(b) (((int) b) & 0xff)
3076
3077 if (strcmp(cmd, "LPSV") == 0) {
3078 p = (char *)&pasv_addr.su_port;
3079 switch (pasv_addr.su_family) {
3080 case AF_INET:
3081 a = (char *) &pasv_addr.su_sin.sin_addr;
3082 v4_reply:
3083 reply(228,
3084 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)",
3085 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]),
3086 2, UC(p[0]), UC(p[1]));
3087 return;
3088 case AF_INET6:
3089 if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) {
3090 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12];
3091 goto v4_reply;
3092 }
3093 a = (char *) &pasv_addr.su_sin6.sin6_addr;
3094 reply(228,
3095 "Entering Long Passive Mode "
3096 "(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)",
3097 6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]),
3098 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]),
3099 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]),
3100 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]),
3101 2, UC(p[0]), UC(p[1]));
3102 return;
3103 }
3104 } else if (strcmp(cmd, "EPSV") == 0) {
3105 switch (pasv_addr.su_family) {
3106 case AF_INET:
3107 case AF_INET6:
3108 reply(229, "Entering Extended Passive Mode (|||%d|)",
3109 ntohs(pasv_addr.su_port));
3110 return;
3111 }
3112 } else {
3113 /* more proper error code? */
3114 }
3115
3116 pasv_error:
3117 (void) seteuid(pw->pw_uid);
3118 (void) close(pdata);
3119 pdata = -1;
3120 perror_reply(425, "Can't open passive connection");
3121 return;
3122 }
3123
3124 /*
3125 * Generate unique name for file with basename "local"
3126 * and open the file in order to avoid possible races.
3127 * Try "local" first, then "local.1", "local.2" etc, up to "local.99".
3128 * Return descriptor to the file, set "name" to its name.
3129 *
3130 * Generates failure reply on error.
3131 */
3132 static int
guniquefd(char * local,char ** name)3133 guniquefd(char *local, char **name)
3134 {
3135 static char new[MAXPATHLEN];
3136 struct stat st;
3137 char *cp;
3138 int count;
3139 int fd;
3140
3141 cp = strrchr(local, '/');
3142 if (cp)
3143 *cp = '\0';
3144 if (stat(cp ? local : ".", &st) < 0) {
3145 perror_reply(553, cp ? local : ".");
3146 return (-1);
3147 }
3148 if (cp) {
3149 /*
3150 * Let not overwrite dirname with counter suffix.
3151 * -4 is for /nn\0
3152 * In this extreme case dot won't be put in front of suffix.
3153 */
3154 if (strlen(local) > sizeof(new) - 4) {
3155 reply(553, "Pathname too long.");
3156 return (-1);
3157 }
3158 *cp = '/';
3159 }
3160 /* -4 is for the .nn<null> we put on the end below */
3161 (void) snprintf(new, sizeof(new) - 4, "%s", local);
3162 cp = new + strlen(new);
3163 /*
3164 * Don't generate dotfile unless requested explicitly.
3165 * This covers the case when basename gets truncated off
3166 * by buffer size.
3167 */
3168 if (cp > new && cp[-1] != '/')
3169 *cp++ = '.';
3170 for (count = 0; count < 100; count++) {
3171 /* At count 0 try unmodified name */
3172 if (count)
3173 (void)sprintf(cp, "%d", count);
3174 if ((fd = open(count ? new : local,
3175 O_RDWR | O_CREAT | O_EXCL, 0666)) >= 0) {
3176 *name = count ? new : local;
3177 return (fd);
3178 }
3179 if (errno != EEXIST) {
3180 perror_reply(553, count ? new : local);
3181 return (-1);
3182 }
3183 }
3184 reply(452, "Unique file name cannot be created.");
3185 return (-1);
3186 }
3187
3188 /*
3189 * Format and send reply containing system error number.
3190 */
3191 void
perror_reply(int code,char * string)3192 perror_reply(int code, char *string)
3193 {
3194
3195 reply(code, "%s: %s.", string, strerror(errno));
3196 }
3197
3198 static char *onefile[] = {
3199 "",
3200 0
3201 };
3202
3203 void
send_file_list(char * whichf)3204 send_file_list(char *whichf)
3205 {
3206 struct stat st;
3207 DIR *dirp = NULL;
3208 struct dirent *dir;
3209 FILE *dout = NULL;
3210 char **dirlist, *dirname;
3211 int simple = 0;
3212 int freeglob = 0;
3213 glob_t gl;
3214
3215 if (strpbrk(whichf, "~{[*?") != NULL) {
3216 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE;
3217
3218 memset(&gl, 0, sizeof(gl));
3219 gl.gl_matchc = MAXGLOBARGS;
3220 flags |= GLOB_LIMIT;
3221 freeglob = 1;
3222 if (glob(whichf, flags, 0, &gl)) {
3223 reply(550, "No matching files found.");
3224 goto out;
3225 } else if (gl.gl_pathc == 0) {
3226 errno = ENOENT;
3227 perror_reply(550, whichf);
3228 goto out;
3229 }
3230 dirlist = gl.gl_pathv;
3231 } else {
3232 onefile[0] = whichf;
3233 dirlist = onefile;
3234 simple = 1;
3235 }
3236
3237 while ((dirname = *dirlist++)) {
3238 if (stat(dirname, &st) < 0) {
3239 /*
3240 * If user typed "ls -l", etc, and the client
3241 * used NLST, do what the user meant.
3242 */
3243 if (dirname[0] == '-' && *dirlist == NULL &&
3244 dout == NULL)
3245 retrieve(_PATH_LS " %s", dirname);
3246 else
3247 perror_reply(550, whichf);
3248 goto out;
3249 }
3250
3251 if (S_ISREG(st.st_mode)) {
3252 if (dout == NULL) {
3253 dout = dataconn("file list", -1, "w");
3254 if (dout == NULL)
3255 goto out;
3256 STARTXFER;
3257 }
3258 START_UNSAFE;
3259 fprintf(dout, "%s%s\n", dirname,
3260 type == TYPE_A ? "\r" : "");
3261 END_UNSAFE;
3262 if (ferror(dout))
3263 goto data_err;
3264 byte_count += strlen(dirname) +
3265 (type == TYPE_A ? 2 : 1);
3266 CHECKOOB(goto abrt);
3267 continue;
3268 } else if (!S_ISDIR(st.st_mode))
3269 continue;
3270
3271 if ((dirp = opendir(dirname)) == NULL)
3272 continue;
3273
3274 while ((dir = readdir(dirp)) != NULL) {
3275 char nbuf[MAXPATHLEN];
3276
3277 CHECKOOB(goto abrt);
3278
3279 #if (defined(__BEOS__) || defined(__HAIKU__))
3280 if (dir->d_name[0] == '.' && dir->d_name[1] == '\0')
3281 continue;
3282 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' &&
3283 dir->d_name[2] == '\0')
3284 continue;
3285 #else
3286 if (dir->d_name[0] == '.' && dir->d_namlen == 1)
3287 continue;
3288 if (dir->d_name[0] == '.' && dir->d_name[1] == '.' &&
3289 dir->d_namlen == 2)
3290 continue;
3291 #endif
3292
3293 snprintf(nbuf, sizeof(nbuf),
3294 "%s/%s", dirname, dir->d_name);
3295
3296 /*
3297 * We have to do a stat to insure it's
3298 * not a directory or special file.
3299 */
3300 if (simple || (stat(nbuf, &st) == 0 &&
3301 S_ISREG(st.st_mode))) {
3302 if (dout == NULL) {
3303 dout = dataconn("file list", -1, "w");
3304 if (dout == NULL)
3305 goto out;
3306 STARTXFER;
3307 }
3308 START_UNSAFE;
3309 if (nbuf[0] == '.' && nbuf[1] == '/')
3310 fprintf(dout, "%s%s\n", &nbuf[2],
3311 type == TYPE_A ? "\r" : "");
3312 else
3313 fprintf(dout, "%s%s\n", nbuf,
3314 type == TYPE_A ? "\r" : "");
3315 END_UNSAFE;
3316 if (ferror(dout))
3317 goto data_err;
3318 byte_count += strlen(nbuf) +
3319 (type == TYPE_A ? 2 : 1);
3320 CHECKOOB(goto abrt);
3321 }
3322 }
3323 (void) closedir(dirp);
3324 dirp = NULL;
3325 }
3326
3327 if (dout == NULL)
3328 reply(550, "No files found.");
3329 else if (ferror(dout))
3330 data_err: perror_reply(550, "Data connection");
3331 else
3332 reply(226, "Transfer complete.");
3333 out:
3334 if (dout) {
3335 ENDXFER;
3336 abrt:
3337 (void) fclose(dout);
3338 data = -1;
3339 pdata = -1;
3340 }
3341 if (dirp)
3342 (void) closedir(dirp);
3343 if (freeglob) {
3344 freeglob = 0;
3345 globfree(&gl);
3346 }
3347 }
3348
3349 void
reapchild(int signo)3350 reapchild(int signo)
3351 {
3352 while (waitpid(-1, NULL, WNOHANG) > 0);
3353 }
3354
3355 static void
appendf(char ** strp,char * fmt,...)3356 appendf(char **strp, char *fmt, ...)
3357 {
3358 va_list ap;
3359 char *ostr, *p;
3360
3361 va_start(ap, fmt);
3362 vasprintf(&p, fmt, ap);
3363 va_end(ap);
3364 if (p == NULL)
3365 fatalerror("Ran out of memory.");
3366 if (*strp == NULL)
3367 *strp = p;
3368 else {
3369 ostr = *strp;
3370 asprintf(strp, "%s%s", ostr, p);
3371 if (*strp == NULL)
3372 fatalerror("Ran out of memory.");
3373 free(ostr);
3374 }
3375 }
3376
3377 static void
logcmd(char * cmd,char * file1,char * file2,off_t cnt)3378 logcmd(char *cmd, char *file1, char *file2, off_t cnt)
3379 {
3380 char *msg = NULL;
3381 char wd[MAXPATHLEN + 1];
3382
3383 if (logging <= 1)
3384 return;
3385
3386 if (getcwd(wd, sizeof(wd) - 1) == NULL)
3387 strcpy(wd, strerror(errno));
3388
3389 appendf(&msg, "%s", cmd);
3390 if (file1)
3391 appendf(&msg, " %s", file1);
3392 if (file2)
3393 appendf(&msg, " %s", file2);
3394 if (cnt >= 0)
3395 appendf(&msg, " = %jd bytes", (intmax_t)cnt);
3396 appendf(&msg, " (wd: %s", wd);
3397 if (guest || dochroot)
3398 appendf(&msg, "; chrooted");
3399 appendf(&msg, ")");
3400 syslog(LOG_INFO, "%s", msg);
3401 free(msg);
3402 }
3403
3404 static void
logxfer(char * name,off_t size,time_t start)3405 logxfer(char *name, off_t size, time_t start)
3406 {
3407 char buf[MAXPATHLEN + 1024];
3408 char path[MAXPATHLEN + 1];
3409 time_t now;
3410
3411 if (statfd >= 0) {
3412 time(&now);
3413 if (realpath(name, path) == NULL) {
3414 syslog(LOG_NOTICE, "realpath failed on %s: %m", path);
3415 return;
3416 }
3417 snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s!%jd!%ld\n",
3418 ctime(&now)+4, ident, remotehost,
3419 path, (intmax_t)size,
3420 (long)(now - start + (now == start)));
3421 write(statfd, buf, strlen(buf));
3422 }
3423 }
3424
3425 static char *
doublequote(char * s)3426 doublequote(char *s)
3427 {
3428 int n;
3429 char *p, *s2;
3430
3431 for (p = s, n = 0; *p; p++)
3432 if (*p == '"')
3433 n++;
3434
3435 if ((s2 = malloc(p - s + n + 1)) == NULL)
3436 return (NULL);
3437
3438 for (p = s2; *s; s++, p++) {
3439 if ((*p = *s) == '"')
3440 *(++p) = '"';
3441 }
3442 *p = '\0';
3443
3444 return (s2);
3445 }
3446
3447 /* setup server socket for specified address family */
3448 /* if af is PF_UNSPEC more than one socket may be returned */
3449 /* the returned list is dynamically allocated, so caller needs to free it */
3450 static int *
socksetup(int af,char * bindname,const char * bindport)3451 socksetup(int af, char *bindname, const char *bindport)
3452 {
3453 struct addrinfo hints, *res, *r;
3454 int error, maxs, *s, *socks;
3455 const int on = 1;
3456
3457 memset(&hints, 0, sizeof(hints));
3458 hints.ai_flags = AI_PASSIVE;
3459 hints.ai_family = af;
3460 hints.ai_socktype = SOCK_STREAM;
3461 error = getaddrinfo(bindname, bindport, &hints, &res);
3462 if (error) {
3463 syslog(LOG_ERR, "%s", gai_strerror(error));
3464 if (error == EAI_SYSTEM)
3465 syslog(LOG_ERR, "%s", strerror(errno));
3466 return NULL;
3467 }
3468
3469 /* Count max number of sockets we may open */
3470 for (maxs = 0, r = res; r; r = r->ai_next, maxs++)
3471 ;
3472 socks = malloc((maxs + 1) * sizeof(int));
3473 if (!socks) {
3474 freeaddrinfo(res);
3475 syslog(LOG_ERR, "couldn't allocate memory for sockets");
3476 return NULL;
3477 }
3478
3479 *socks = 0; /* num of sockets counter at start of array */
3480 s = socks + 1;
3481 for (r = res; r; r = r->ai_next) {
3482 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol);
3483 if (*s < 0) {
3484 syslog(LOG_DEBUG, "control socket: %m");
3485 continue;
3486 }
3487 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR,
3488 &on, sizeof(on)) < 0)
3489 syslog(LOG_WARNING,
3490 "control setsockopt (SO_REUSEADDR): %m");
3491 if (r->ai_family == AF_INET6) {
3492 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY,
3493 &on, sizeof(on)) < 0)
3494 syslog(LOG_WARNING,
3495 "control setsockopt (IPV6_V6ONLY): %m");
3496 }
3497 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) {
3498 syslog(LOG_DEBUG, "control bind: %m");
3499 close(*s);
3500 continue;
3501 }
3502 (*socks)++;
3503 s++;
3504 }
3505
3506 if (res)
3507 freeaddrinfo(res);
3508
3509 if (*socks == 0) {
3510 syslog(LOG_ERR, "control socket: Couldn't bind to any socket");
3511 free(socks);
3512 return NULL;
3513 }
3514 return(socks);
3515 }
3516