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