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Add back a signbit.3 manpage that was killed w/o providing a substitute.
[dragonfly.git] / libexec / ftpd / ftpd.c
blobed979d5e60a565a443cde6ac002fedeb7e909610
1 /*
2 * Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#)ftpd.c 8.4 (Berkeley) 4/16/94
30 * $FreeBSD: src/libexec/ftpd/ftpd.c,v 1.213 2008/12/23 01:23:09 cperciva Exp $
31 */
32
33 /*
34 * FTP server.
35 */
36 #include <sys/param.h>
37 #include <sys/ioctl.h>
38 #include <sys/mman.h>
39 #include <sys/socket.h>
40 #include <sys/stat.h>
41 #include <sys/time.h>
42 #include <sys/wait.h>
43
44 #include <netinet/in.h>
45 #include <netinet/in_systm.h>
46 #include <netinet/ip.h>
47 #include <netinet/tcp.h>
48
49 #define FTP_NAMES
50 #include <arpa/ftp.h>
51 #include <arpa/inet.h>
52 #include <arpa/telnet.h>
53
54 #include <ctype.h>
55 #include <dirent.h>
56 #include <err.h>
57 #include <errno.h>
58 #include <fcntl.h>
59 #include <glob.h>
60 #include <limits.h>
61 #include <netdb.h>
62 #include <pwd.h>
63 #include <grp.h>
64 #include <opie.h>
65 #include <signal.h>
66 #include <stdint.h>
67 #include <stdio.h>
68 #include <stdlib.h>
69 #include <string.h>
70 #include <syslog.h>
71 #include <time.h>
72 #include <unistd.h>
73 #include <libutil.h>
74 #ifdef LOGIN_CAP
75 #include <login_cap.h>
76 #endif
77
78 #ifdef USE_PAM
79 #include <security/pam_appl.h>
80 #endif
81
82 #include "pathnames.h"
83 #include "extern.h"
84 #include "pidfile.h"
85
86 #include <stdarg.h>
87
88 static char version[] = "Version 6.00LS";
89 #undef main
90
91 extern off_t restart_point;
92 extern char cbuf[];
93
94 union sockunion ctrl_addr;
95 union sockunion data_source;
96 union sockunion data_dest;
97 union sockunion his_addr;
98 union sockunion pasv_addr;
99
100 int daemon_mode;
101 int data;
102 int dataport;
103 int hostinfo = 1; /* print host-specific info in messages */
104 int logged_in;
105 struct passwd *pw;
106 char *homedir;
107 int ftpdebug;
108 int timeout = 900; /* timeout after 15 minutes of inactivity */
109 int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */
110 int logging;
111 int restricted_data_ports = 1;
112 int paranoid = 1; /* be extra careful about security */
113 int anon_only = 0; /* Only anonymous ftp allowed */
114 int assumeutf8 = 0; /* Assume that server file names are in UTF-8 */
115 int guest;
116 int dochroot;
117 char *chrootdir;
118 int dowtmp = 1;
119 int stats;
120 int statfd = -1;
121 int type;
122 int form;
123 int stru; /* avoid C keyword */
124 int mode;
125 int usedefault = 1; /* for data transfers */
126 int pdata = -1; /* for passive mode */
127 int readonly = 0; /* Server is in readonly mode. */
128 int noepsv = 0; /* EPSV command is disabled. */
129 int noretr = 0; /* RETR command is disabled. */
130 int noguestretr = 0; /* RETR command is disabled for anon users. */
131 int noguestmkd = 0; /* MKD command is disabled for anon users. */
132 int noguestmod = 1; /* anon users may not modify existing files. */
133
134 off_t file_size;
135 off_t byte_count;
136 #if !defined(CMASK) || CMASK == 0
137 #undef CMASK
138 #define CMASK 027
139 #endif
140 int defumask = CMASK; /* default umask value */
141 char tmpline[7];
142 char *hostname;
143 int epsvall = 0;
144
145 #ifdef VIRTUAL_HOSTING
146 char *ftpuser;
147
148 static struct ftphost {
149 struct ftphost *next;
150 struct addrinfo *hostinfo;
151 char *hostname;
152 char *anonuser;
153 char *statfile;
154 char *welcome;
155 char *loginmsg;
156 } *thishost, *firsthost;
157
158 #endif
159 char remotehost[NI_MAXHOST];
160 char *ident = NULL;
161
162 static char ttyline[20];
163 char *tty = ttyline; /* for klogin */
164
165 #ifdef USE_PAM
166 static int auth_pam(struct passwd**, const char*);
167 pam_handle_t *pamh = NULL;
168 #endif
169
170 static struct opie opiedata;
171 static char opieprompt[OPIE_CHALLENGE_MAX+1];
172 static int pwok;
173
174 char *pid_file = NULL; /* means default location to pidfile(3) */
175
176 /*
177 * Limit number of pathnames that glob can return.
178 * A limit of 0 indicates the number of pathnames is unlimited.
179 */
180 #define MAXGLOBARGS 16384
181
182 /*
183 * Timeout intervals for retrying connections
184 * to hosts that don't accept PORT cmds. This
185 * is a kludge, but given the problems with TCP...
186 */
187 #define SWAITMAX 90 /* wait at most 90 seconds */
188 #define SWAITINT 5 /* interval between retries */
189
190 int swaitmax = SWAITMAX;
191 int swaitint = SWAITINT;
192
193 #ifdef SETPROCTITLE
194 char proctitle[LINE_MAX]; /* initial part of title */
195 #endif /* SETPROCTITLE */
196
197 #define LOGCMD(cmd, file) logcmd((cmd), (file), NULL, -1)
198 #define LOGCMD2(cmd, file1, file2) logcmd((cmd), (file1), (file2), -1)
199 #define LOGBYTES(cmd, file, cnt) logcmd((cmd), (file), NULL, (cnt))
200
201 static volatile sig_atomic_t recvurg;
202 static int transflag; /* NB: for debugging only */
203
204 #define STARTXFER flagxfer(1)
205 #define ENDXFER flagxfer(0)
206
207 #define START_UNSAFE maskurg(1)
208 #define END_UNSAFE maskurg(0)
209
210 /* It's OK to put an `else' clause after this macro. */
211 #define CHECKOOB(action) \
212 if (recvurg) { \
213 recvurg = 0; \
214 if (myoob()) { \
215 ENDXFER; \
216 action; \
217 } \
218 }
219
220 #ifdef VIRTUAL_HOSTING
221 static void inithosts(int);
222 static void selecthost(union sockunion *);
223 #endif
224 static void ack(char *);
225 static void sigurg(int);
226 static void maskurg(int);
227 static void flagxfer(int);
228 static int myoob(void);
229 static int checkuser(char *, char *, int, char **);
230 static FILE *dataconn(char *, off_t, char *);
231 static void dolog(struct sockaddr *);
232 static void end_login(void);
233 static FILE *getdatasock(char *);
234 static int guniquefd(char *, char **);
235 static void lostconn(int);
236 static void sigquit(int);
237 static int receive_data(FILE *, FILE *);
238 static int send_data(FILE *, FILE *, size_t, off_t, int);
239 static struct passwd *
240 sgetpwnam(char *);
241 static char *sgetsave(char *);
242 static void reapchild(int);
243 static void appendf(char **, char *, ...) __printflike(2, 3);
244 static void logcmd(char *, char *, char *, off_t);
245 static void logxfer(char *, off_t, time_t);
246 static char *doublequote(char *);
247 static int *socksetup(int, char *, const char *);
248
249 int
250 main(int argc, char *argv[])
251 {
252 socklen_t addrlen;
253 int ch, on = 1, tos;
254 char *cp, line[LINE_MAX];
255 FILE *fd;
256 char *bindname = NULL;
257 const char *bindport = "ftp";
258 int family = AF_UNSPEC;
259 struct sigaction sa;
260
261 tzset(); /* in case no timezone database in ~ftp */
262 sigemptyset(&sa.sa_mask);
263 sa.sa_flags = SA_RESTART;
264
265 /*
266 * Prevent diagnostic messages from appearing on stderr.
267 * We run as a daemon or from inetd; in both cases, there's
268 * more reason in logging to syslog.
269 */
270 freopen(_PATH_DEVNULL, "w", stderr);
271 opterr = 0;
272
273 /*
274 * LOG_NDELAY sets up the logging connection immediately,
275 * necessary for anonymous ftp's that chroot and can't do it later.
276 */
277 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP);
278
279 while ((ch = getopt(argc, argv,
280 "468a:AdDEH:hlmMoOp:P:rRSt:T:u:UvW")) != -1) {
281 switch (ch) {
282 case '4':
283 family = (family == AF_INET6) ? AF_UNSPEC : AF_INET;
284 break;
285
286 case '6':
287 family = (family == AF_INET) ? AF_UNSPEC : AF_INET6;
288 break;
289
290 case '8':
291 assumeutf8 = 1;
292 break;
293
294 case 'a':
295 bindname = optarg;
296 break;
297
298 case 'A':
299 anon_only = 1;
300 break;
301
302 case 'd':
303 ftpdebug++;
304 break;
305
306 case 'D':
307 daemon_mode++;
308 break;
309
310 case 'E':
311 noepsv = 1;
312 break;
313
314 case 'h':
315 hostinfo = 0;
316 break;
317
318 case 'H':
319 hostname = optarg;
320 break;
321
322 case 'l':
323 logging++; /* > 1 == extra logging */
324 break;
325
326 case 'm':
327 noguestmod = 0;
328 break;
329
330 case 'M':
331 noguestmkd = 1;
332 break;
333
334 case 'o':
335 noretr = 1;
336 break;
337
338 case 'O':
339 noguestretr = 1;
340 break;
341
342 case 'p':
343 pid_file = optarg;
344 break;
345
346 case 'P':
347 bindport = optarg;
348 break;
349
350 case 'r':
351 readonly = 1;
352 break;
353
354 case 'R':
355 paranoid = 0;
356 break;
357
358 case 'S':
359 stats++;
360 break;
361
362 case 't':
363 timeout = atoi(optarg);
364 if (maxtimeout < timeout)
365 maxtimeout = timeout;
366 break;
367
368 case 'T':
369 maxtimeout = atoi(optarg);
370 if (timeout > maxtimeout)
371 timeout = maxtimeout;
372 break;
373
374 case 'u':
375 {
376 long val = 0;
377
378 val = strtol(optarg, &optarg, 8);
379 if (*optarg != '\0' || val < 0)
380 syslog(LOG_WARNING, "bad value for -u");
381 else
382 defumask = val;
383 break;
384 }
385 case 'U':
386 restricted_data_ports = 0;
387 break;
388
389 case 'v':
390 ftpdebug++;
391 break;
392
393 case 'W':
394 dowtmp = 0;
395 break;
396
397 default:
398 syslog(LOG_WARNING, "unknown flag -%c ignored", optopt);
399 break;
400 }
401 }
402
403 if (daemon_mode) {
404 int *ctl_sock, fd, maxfd = -1, nfds, i;
405 fd_set defreadfds, readfds;
406 pid_t pid;
407 struct pidfh *pfh;
408
409 if ((pfh = pidfile_open(pid_file, 0600, &pid)) == NULL) {
410 if (errno == EEXIST) {
411 syslog(LOG_ERR, "%s already running, pid %d",
412 getprogname(), (int)pid);
413 exit(1);
414 }
415 syslog(LOG_WARNING, "pidfile_open: %m");
416 }
417
418 /*
419 * Detach from parent.
420 */
421 if (daemon(1, 1) < 0) {
422 syslog(LOG_ERR, "failed to become a daemon");
423 exit(1);
424 }
425
426 if (pfh != NULL && pidfile_write(pfh) == -1)
427 syslog(LOG_WARNING, "pidfile_write: %m");
428
429 sa.sa_handler = reapchild;
430 sigaction(SIGCHLD, &sa, NULL);
431
432 #ifdef VIRTUAL_HOSTING
433 inithosts(family);
434 #endif
435
436 /*
437 * Open a socket, bind it to the FTP port, and start
438 * listening.
439 */
440 ctl_sock = socksetup(family, bindname, bindport);
441 if (ctl_sock == NULL)
442 exit(1);
443
444 FD_ZERO(&defreadfds);
445 for (i = 1; i <= *ctl_sock; i++) {
446 FD_SET(ctl_sock[i], &defreadfds);
447 if (listen(ctl_sock[i], 32) < 0) {
448 syslog(LOG_ERR, "control listen: %m");
449 exit(1);
450 }
451 if (maxfd < ctl_sock[i])
452 maxfd = ctl_sock[i];
453 }
454
455 /*
456 * Loop forever accepting connection requests and forking off
457 * children to handle them.
458 */
459 while (1) {
460 FD_COPY(&defreadfds, &readfds);
461 nfds = select(maxfd + 1, &readfds, NULL, NULL, 0);
462 if (nfds <= 0) {
463 if (nfds < 0 && errno != EINTR)
464 syslog(LOG_WARNING, "select: %m");
465 continue;
466 }
467
468 pid = -1;
469 for (i = 1; i <= *ctl_sock; i++)
470 if (FD_ISSET(ctl_sock[i], &readfds)) {
471 addrlen = sizeof(his_addr);
472 fd = accept(ctl_sock[i],
473 (struct sockaddr *)&his_addr,
474 &addrlen);
475 if (fd == -1) {
476 syslog(LOG_WARNING,
477 "accept: %m");
478 continue;
479 }
480 switch (pid = fork()) {
481 case 0:
482 /* child */
483 dup2(fd, 0);
484 dup2(fd, 1);
485 close(fd);
486 for (i = 1; i <= *ctl_sock; i++)
487 close(ctl_sock[i]);
488 if (pfh != NULL)
489 pidfile_close(pfh);
490 goto gotchild;
491 case -1:
492 syslog(LOG_WARNING, "fork: %m");
493 /* FALLTHROUGH */
494 default:
495 close(fd);
496 }
497 }
498 }
499 } else {
500 addrlen = sizeof(his_addr);
501 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) {
502 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]);
503 exit(1);
504 }
505
506 #ifdef VIRTUAL_HOSTING
507 if (his_addr.su_family == AF_INET6 &&
508 IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr))
509 family = AF_INET;
510 else
511 family = his_addr.su_family;
512 inithosts(family);
513 #endif
514 }
515
516 gotchild:
517 sa.sa_handler = SIG_DFL;
518 sigaction(SIGCHLD, &sa, NULL);
519
520 sa.sa_handler = sigurg;
521 sa.sa_flags = 0; /* don't restart syscalls for SIGURG */
522 sigaction(SIGURG, &sa, NULL);
523
524 sigfillset(&sa.sa_mask); /* block all signals in handler */
525 sa.sa_flags = SA_RESTART;
526 sa.sa_handler = sigquit;
527 sigaction(SIGHUP, &sa, NULL);
528 sigaction(SIGINT, &sa, NULL);
529 sigaction(SIGQUIT, &sa, NULL);
530 sigaction(SIGTERM, &sa, NULL);
531
532 sa.sa_handler = lostconn;
533 sigaction(SIGPIPE, &sa, NULL);
534
535 addrlen = sizeof(ctrl_addr);
536 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) {
537 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]);
538 exit(1);
539 }
540 dataport = ntohs(ctrl_addr.su_port) - 1; /* as per RFC 959 */
541 #ifdef VIRTUAL_HOSTING
542 /* select our identity from virtual host table */
543 selecthost(&ctrl_addr);
544 #endif
545 #ifdef IP_TOS
546 if (ctrl_addr.su_family == AF_INET)
547 {
548 tos = IPTOS_LOWDELAY;
549 if (setsockopt(0, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0)
550 syslog(LOG_WARNING, "control setsockopt (IP_TOS): %m");
551 }
552 #endif
553 /*
554 * Disable Nagle on the control channel so that we don't have to wait
555 * for peer's ACK before issuing our next reply.
556 */
557 if (setsockopt(0, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0)
558 syslog(LOG_WARNING, "control setsockopt (TCP_NODELAY): %m");
559
560 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1);
561
562 /* set this here so klogin can use it... */
563 snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid());
564
565 /* Try to handle urgent data inline */
566 #ifdef SO_OOBINLINE
567 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)) < 0)
568 syslog(LOG_WARNING, "control setsockopt (SO_OOBINLINE): %m");
569 #endif
570
571 #ifdef F_SETOWN
572 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1)
573 syslog(LOG_ERR, "fcntl F_SETOWN: %m");
574 #endif
575 dolog((struct sockaddr *)&his_addr);
576 /*
577 * Set up default state
578 */
579 data = -1;
580 type = TYPE_A;
581 form = FORM_N;
582 stru = STRU_F;
583 mode = MODE_S;
584 tmpline[0] = '\0';
585
586 /* If logins are disabled, print out the message. */
587 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) {
588 while (fgets(line, sizeof(line), fd) != NULL) {
589 if ((cp = strchr(line, '\n')) != NULL)
590 *cp = '\0';
591 lreply(530, "%s", line);
592 }
593 fflush(stdout);
594 fclose(fd);
595 reply(530, "System not available.");
596 exit(0);
597 }
598 #ifdef VIRTUAL_HOSTING
599 fd = fopen(thishost->welcome, "r");
600 #else
601 fd = fopen(_PATH_FTPWELCOME, "r");
602 #endif
603 if (fd != NULL) {
604 while (fgets(line, sizeof(line), fd) != NULL) {
605 if ((cp = strchr(line, '\n')) != NULL)
606 *cp = '\0';
607 lreply(220, "%s", line);
608 }
609 fflush(stdout);
610 fclose(fd);
611 /* reply(220,) must follow */
612 }
613 #ifndef VIRTUAL_HOSTING
614 if (hostname == NULL) {
615 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL)
616 fatalerror("Ran out of memory.");
617 if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0)
618 hostname[0] = '\0';
619 hostname[MAXHOSTNAMELEN - 1] = '\0';
620 }
621 #endif
622 if (hostinfo)
623 reply(220, "%s FTP server (%s) ready.", hostname, version);
624 else
625 reply(220, "FTP server ready.");
626 for (;;)
627 yyparse();
628 /* NOTREACHED */
629 }
630
631 static void
632 lostconn(int signo)
633 {
634
635 if (ftpdebug)
636 syslog(LOG_DEBUG, "lost connection");
637 dologout(1);
638 }
639
640 static void
641 sigquit(int signo)
642 {
643
644 syslog(LOG_ERR, "got signal %d", signo);
645 dologout(1);
646 }
647
648 #ifdef VIRTUAL_HOSTING
649 /*
650 * read in virtual host tables (if they exist)
651 */
652
653 static void
654 inithosts(int family)
655 {
656 int insert;
657 size_t len;
658 FILE *fp;
659 char *cp, *mp, *line;
660 char *vhost, *anonuser, *statfile, *welcome, *loginmsg;
661 struct ftphost *hrp, *lhrp;
662 struct addrinfo hints, *res, *ai;
663
664 /*
665 * Fill in the default host information
666 */
667 if (hostname == NULL) {
668 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL)
669 fatalerror("Ran out of memory.");
670 if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0)
671 hostname[0] = '\0';
672 hostname[MAXHOSTNAMELEN - 1] = '\0';
673 }
674 if ((hrp = malloc(sizeof(struct ftphost))) == NULL)
675 fatalerror("Ran out of memory.");
676 hrp->hostname = hostname;
677 hrp->hostinfo = NULL;
678
679 memset(&hints, 0, sizeof(hints));
680 hints.ai_flags = AI_PASSIVE;
681 hints.ai_family = family;
682 hints.ai_socktype = SOCK_STREAM;
683 if (getaddrinfo(hrp->hostname, NULL, &hints, &res) == 0)
684 hrp->hostinfo = res;
685 hrp->statfile = _PATH_FTPDSTATFILE;
686 hrp->welcome = _PATH_FTPWELCOME;
687 hrp->loginmsg = _PATH_FTPLOGINMESG;
688 hrp->anonuser = "ftp";
689 hrp->next = NULL;
690 thishost = firsthost = lhrp = hrp;
691 if ((fp = fopen(_PATH_FTPHOSTS, "r")) != NULL) {
692 int addrsize, gothost;
693 void *addr;
694 struct hostent *hp;
695
696 while ((line = fgetln(fp, &len)) != NULL) {
697 int i, hp_error;
698
699 /* skip comments */
700 if (line[0] == '#')
701 continue;
702 if (line[len - 1] == '\n') {
703 line[len - 1] = '\0';
704 mp = NULL;
705 } else {
706 if ((mp = malloc(len + 1)) == NULL)
707 fatalerror("Ran out of memory.");
708 memcpy(mp, line, len);
709 mp[len] = '\0';
710 line = mp;
711 }
712 cp = strtok(line, " \t");
713 /* skip empty lines */
714 if (cp == NULL)
715 goto nextline;
716 vhost = cp;
717
718 /* set defaults */
719 anonuser = "ftp";
720 statfile = _PATH_FTPDSTATFILE;
721 welcome = _PATH_FTPWELCOME;
722 loginmsg = _PATH_FTPLOGINMESG;
723
724 /*
725 * Preparse the line so we can use its info
726 * for all the addresses associated with
727 * the virtual host name.
728 * Field 0, the virtual host name, is special:
729 * it's already parsed off and will be strdup'ed
730 * later, after we know its canonical form.
731 */
732 for (i = 1; i < 5 && (cp = strtok(NULL, " \t")); i++)
733 if (*cp != '-' && (cp = strdup(cp)))
734 switch (i) {
735 case 1: /* anon user permissions */
736 anonuser = cp;
737 break;
738 case 2: /* statistics file */
739 statfile = cp;
740 break;
741 case 3: /* welcome message */
742 welcome = cp;
743 break;
744 case 4: /* login message */
745 loginmsg = cp;
746 break;
747 default: /* programming error */
748 abort();
749 /* NOTREACHED */
750 }
751
752 hints.ai_flags = AI_PASSIVE;
753 hints.ai_family = family;
754 hints.ai_socktype = SOCK_STREAM;
755 if (getaddrinfo(vhost, NULL, &hints, &res) != 0)
756 goto nextline;
757 for (ai = res; ai != NULL && ai->ai_addr != NULL;
758 ai = ai->ai_next) {
759
760 gothost = 0;
761 for (hrp = firsthost; hrp != NULL; hrp = hrp->next) {
762 struct addrinfo *hi;
763
764 for (hi = hrp->hostinfo; hi != NULL;
765 hi = hi->ai_next)
766 if (hi->ai_addrlen == ai->ai_addrlen &&
767 memcmp(hi->ai_addr,
768 ai->ai_addr,
769 ai->ai_addr->sa_len) == 0) {
770 gothost++;
771 break;
772 }
773 if (gothost)
774 break;
775 }
776 if (hrp == NULL) {
777 if ((hrp = malloc(sizeof(struct ftphost))) == NULL)
778 goto nextline;
779 hrp->hostname = NULL;
780 insert = 1;
781 } else {
782 if (hrp->hostinfo && hrp->hostinfo != res)
783 freeaddrinfo(hrp->hostinfo);
784 insert = 0; /* host already in the chain */
785 }
786 hrp->hostinfo = res;
787
788 /*
789 * determine hostname to use.
790 * force defined name if there is a valid alias
791 * otherwise fallback to primary hostname
792 */
793 /* XXX: getaddrinfo() can't do alias check */
794 switch(hrp->hostinfo->ai_family) {
795 case AF_INET:
796 addr = &((struct sockaddr_in *)hrp->hostinfo->ai_addr)->sin_addr;
797 addrsize = sizeof(struct in_addr);
798 break;
799 case AF_INET6:
800 addr = &((struct sockaddr_in6 *)hrp->hostinfo->ai_addr)->sin6_addr;
801 addrsize = sizeof(struct in6_addr);
802 break;
803 default:
804 /* should not reach here */
805 freeaddrinfo(hrp->hostinfo);
806 if (insert)
807 free(hrp); /*not in chain, can free*/
808 else
809 hrp->hostinfo = NULL; /*mark as blank*/
810 goto nextline;
811 /* NOTREACHED */
812 }
813 if ((hp = getipnodebyaddr(addr, addrsize,
814 hrp->hostinfo->ai_family,
815 &hp_error)) != NULL) {
816 if (strcmp(vhost, hp->h_name) != 0) {
817 if (hp->h_aliases == NULL)
818 vhost = hp->h_name;
819 else {
820 i = 0;
821 while (hp->h_aliases[i] &&
822 strcmp(vhost, hp->h_aliases[i]) != 0)
823 ++i;
824 if (hp->h_aliases[i] == NULL)
825 vhost = hp->h_name;
826 }
827 }
828 }
829 if (hrp->hostname &&
830 strcmp(hrp->hostname, vhost) != 0) {
831 free(hrp->hostname);
832 hrp->hostname = NULL;
833 }
834 if (hrp->hostname == NULL &&
835 (hrp->hostname = strdup(vhost)) == NULL) {
836 freeaddrinfo(hrp->hostinfo);
837 hrp->hostinfo = NULL; /* mark as blank */
838 if (hp)
839 freehostent(hp);
840 goto nextline;
841 }
842 hrp->anonuser = anonuser;
843 hrp->statfile = statfile;
844 hrp->welcome = welcome;
845 hrp->loginmsg = loginmsg;
846 if (insert) {
847 hrp->next = NULL;
848 lhrp->next = hrp;
849 lhrp = hrp;
850 }
851 if (hp)
852 freehostent(hp);
853 }
854 nextline:
855 if (mp)
856 free(mp);
857 }
858 fclose(fp);
859 }
860 }
861
862 static void
863 selecthost(union sockunion *su)
864 {
865 struct ftphost *hrp;
866 u_int16_t port;
867 #ifdef INET6
868 struct in6_addr *mapped_in6 = NULL;
869 #endif
870 struct addrinfo *hi;
871
872 #ifdef INET6
873 /*
874 * XXX IPv4 mapped IPv6 addr consideraton,
875 * specified in rfc2373.
876 */
877 if (su->su_family == AF_INET6 &&
878 IN6_IS_ADDR_V4MAPPED(&su->su_sin6.sin6_addr))
879 mapped_in6 = &su->su_sin6.sin6_addr;
880 #endif
881
882 hrp = thishost = firsthost; /* default */
883 port = su->su_port;
884 su->su_port = 0;
885 while (hrp != NULL) {
886 for (hi = hrp->hostinfo; hi != NULL; hi = hi->ai_next) {
887 if (memcmp(su, hi->ai_addr, hi->ai_addrlen) == 0) {
888 thishost = hrp;
889 goto found;
890 }
891 #ifdef INET6
892 /* XXX IPv4 mapped IPv6 addr consideraton */
893 if (hi->ai_addr->sa_family == AF_INET && mapped_in6 != NULL &&
894 (memcmp(&mapped_in6->s6_addr[12],
895 &((struct sockaddr_in *)hi->ai_addr)->sin_addr,
896 sizeof(struct in_addr)) == 0)) {
897 thishost = hrp;
898 goto found;
899 }
900 #endif
901 }
902 hrp = hrp->next;
903 }
904 found:
905 su->su_port = port;
906 /* setup static variables as appropriate */
907 hostname = thishost->hostname;
908 ftpuser = thishost->anonuser;
909 }
910 #endif
911
912 /*
913 * Helper function for sgetpwnam().
914 */
915 static char *
916 sgetsave(char *s)
917 {
918 char *new = malloc(strlen(s) + 1);
919
920 if (new == NULL) {
921 reply(421, "Ran out of memory.");
922 dologout(1);
923 /* NOTREACHED */
924 }
925 strcpy(new, s);
926 return (new);
927 }
928
929 /*
930 * Save the result of a getpwnam. Used for USER command, since
931 * the data returned must not be clobbered by any other command
932 * (e.g., globbing).
933 * NB: The data returned by sgetpwnam() will remain valid until
934 * the next call to this function. Its difference from getpwnam()
935 * is that sgetpwnam() is known to be called from ftpd code only.
936 */
937 static struct passwd *
938 sgetpwnam(char *name)
939 {
940 static struct passwd save;
941 struct passwd *p;
942
943 if ((p = getpwnam(name)) == NULL)
944 return (p);
945 if (save.pw_name) {
946 free(save.pw_name);
947 free(save.pw_passwd);
948 free(save.pw_gecos);
949 free(save.pw_dir);
950 free(save.pw_shell);
951 }
952 save = *p;
953 save.pw_name = sgetsave(p->pw_name);
954 save.pw_passwd = sgetsave(p->pw_passwd);
955 save.pw_gecos = sgetsave(p->pw_gecos);
956 save.pw_dir = sgetsave(p->pw_dir);
957 save.pw_shell = sgetsave(p->pw_shell);
958 return (&save);
959 }
960
961 static int login_attempts; /* number of failed login attempts */
962 static int askpasswd; /* had user command, ask for passwd */
963 static char curname[MAXLOGNAME]; /* current USER name */
964
965 /*
966 * USER command.
967 * Sets global passwd pointer pw if named account exists and is acceptable;
968 * sets askpasswd if a PASS command is expected. If logged in previously,
969 * need to reset state. If name is "ftp" or "anonymous", the name is not in
970 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return.
971 * If account doesn't exist, ask for passwd anyway. Otherwise, check user
972 * requesting login privileges. Disallow anyone who does not have a standard
973 * shell as returned by getusershell(). Disallow anyone mentioned in the file
974 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided.
975 */
976 void
977 user(char *name)
978 {
979 char *cp, *shell;
980
981 if (logged_in) {
982 if (guest) {
983 reply(530, "Can't change user from guest login.");
984 return;
985 } else if (dochroot) {
986 reply(530, "Can't change user from chroot user.");
987 return;
988 }
989 end_login();
990 }
991
992 guest = 0;
993 #ifdef VIRTUAL_HOSTING
994 pw = sgetpwnam(thishost->anonuser);
995 #else
996 pw = sgetpwnam("ftp");
997 #endif
998 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) {
999 if (checkuser(_PATH_FTPUSERS, "ftp", 0, NULL) ||
1000 checkuser(_PATH_FTPUSERS, "anonymous", 0, NULL))
1001 reply(530, "User %s access denied.", name);
1002 else if (pw != NULL) {
1003 guest = 1;
1004 askpasswd = 1;
1005 reply(331,
1006 "Guest login ok, send your email address as password.");
1007 } else
1008 reply(530, "User %s unknown.", name);
1009 if (!askpasswd && logging)
1010 syslog(LOG_NOTICE,
1011 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost);
1012 return;
1013 }
1014 if (anon_only != 0) {
1015 reply(530, "Sorry, only anonymous ftp allowed.");
1016 return;
1017 }
1018
1019 if ((pw = sgetpwnam(name))) {
1020 if ((shell = pw->pw_shell) == NULL || *shell == 0)
1021 shell = _PATH_BSHELL;
1022 setusershell();
1023 while ((cp = getusershell()) != NULL)
1024 if (strcmp(cp, shell) == 0)
1025 break;
1026 endusershell();
1027
1028 if (cp == NULL || checkuser(_PATH_FTPUSERS, name, 1, NULL)) {
1029 reply(530, "User %s access denied.", name);
1030 if (logging)
1031 syslog(LOG_NOTICE,
1032 "FTP LOGIN REFUSED FROM %s, %s",
1033 remotehost, name);
1034 pw = NULL;
1035 return;
1036 }
1037 }
1038 if (logging)
1039 strncpy(curname, name, sizeof(curname)-1);
1040
1041 pwok = 0;
1042 #ifdef USE_PAM
1043 /* XXX Kluge! The conversation mechanism needs to be fixed. */
1044 #endif
1045 if (opiechallenge(&opiedata, name, opieprompt) == 0) {
1046 pwok = (pw != NULL) &&
1047 opieaccessfile(remotehost) &&
1048 opiealways(pw->pw_dir);
1049 reply(331, "Response to %s %s for %s.",
1050 opieprompt, pwok ? "requested" : "required", name);
1051 } else {
1052 pwok = 1;
1053 reply(331, "Password required for %s.", name);
1054 }
1055 askpasswd = 1;
1056 /*
1057 * Delay before reading passwd after first failed
1058 * attempt to slow down passwd-guessing programs.
1059 */
1060 if (login_attempts)
1061 sleep(login_attempts);
1062 }
1063
1064 /*
1065 * Check if a user is in the file "fname",
1066 * return a pointer to a malloc'd string with the rest
1067 * of the matching line in "residue" if not NULL.
1068 */
1069 static int
1070 checkuser(char *fname, char *name, int pwset, char **residue)
1071 {
1072 FILE *fd;
1073 int found = 0;
1074 size_t len;
1075 char *line, *mp, *p;
1076
1077 if ((fd = fopen(fname, "r")) != NULL) {
1078 while (!found && (line = fgetln(fd, &len)) != NULL) {
1079 /* skip comments */
1080 if (line[0] == '#')
1081 continue;
1082 if (line[len - 1] == '\n') {
1083 line[len - 1] = '\0';
1084 mp = NULL;
1085 } else {
1086 if ((mp = malloc(len + 1)) == NULL)
1087 fatalerror("Ran out of memory.");
1088 memcpy(mp, line, len);
1089 mp[len] = '\0';
1090 line = mp;
1091 }
1092 /* avoid possible leading and trailing whitespace */
1093 p = strtok(line, " \t");
1094 /* skip empty lines */
1095 if (p == NULL)
1096 goto nextline;
1097 /*
1098 * if first chr is '@', check group membership
1099 */
1100 if (p[0] == '@') {
1101 int i = 0;
1102 struct group *grp;
1103
1104 if (p[1] == '\0') /* single @ matches anyone */
1105 found = 1;
1106 else {
1107 if ((grp = getgrnam(p+1)) == NULL)
1108 goto nextline;
1109 /*
1110 * Check user's default group
1111 */
1112 if (pwset && grp->gr_gid == pw->pw_gid)
1113 found = 1;
1114 /*
1115 * Check supplementary groups
1116 */
1117 while (!found && grp->gr_mem[i])
1118 found = strcmp(name,
1119 grp->gr_mem[i++])
1120 == 0;
1121 }
1122 }
1123 /*
1124 * Otherwise, just check for username match
1125 */
1126 else
1127 found = strcmp(p, name) == 0;
1128 /*
1129 * Save the rest of line to "residue" if matched
1130 */
1131 if (found && residue) {
1132 if ((p = strtok(NULL, "")) != NULL)
1133 p += strspn(p, " \t");
1134 if (p && *p) {
1135 if ((*residue = strdup(p)) == NULL)
1136 fatalerror("Ran out of memory.");
1137 } else
1138 *residue = NULL;
1139 }
1140 nextline:
1141 if (mp)
1142 free(mp);
1143 }
1144 fclose(fd);
1145 }
1146 return (found);
1147 }
1148
1149 /*
1150 * Terminate login as previous user, if any, resetting state;
1151 * used when USER command is given or login fails.
1152 */
1153 static void
1154 end_login(void)
1155 {
1156 #ifdef USE_PAM
1157 int e;
1158 #endif
1159
1160 seteuid(0);
1161 if (logged_in && dowtmp)
1162 ftpd_logwtmp(ttyline, "", NULL);
1163 pw = NULL;
1164 #ifdef LOGIN_CAP
1165 /* XXX Missing LOGIN_SETMAC */
1166 setusercontext(NULL, getpwuid(0), 0,
1167 LOGIN_SETPRIORITY|LOGIN_SETRESOURCES|LOGIN_SETUMASK);
1168 #endif
1169 #ifdef USE_PAM
1170 if (pamh) {
1171 if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS)
1172 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e));
1173 if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS)
1174 syslog(LOG_ERR, "pam_close_session: %s", pam_strerror(pamh, e));
1175 if ((e = pam_end(pamh, e)) != PAM_SUCCESS)
1176 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e));
1177 pamh = NULL;
1178 }
1179 #endif
1180 logged_in = 0;
1181 guest = 0;
1182 dochroot = 0;
1183 }
1184
1185 #ifdef USE_PAM
1186
1187 /*
1188 * the following code is stolen from imap-uw PAM authentication module and
1189 * login.c
1190 */
1191 #define COPY_STRING(s) (s ? strdup(s) : NULL)
1192
1193 struct cred_t {
1194 const char *uname; /* user name */
1195 const char *pass; /* password */
1196 };
1197 typedef struct cred_t cred_t;
1198
1199 static int
1200 auth_conv(int num_msg, const struct pam_message **msg,
1201 struct pam_response **resp, void *appdata)
1202 {
1203 int i;
1204 cred_t *cred = (cred_t *) appdata;
1205 struct pam_response *reply;
1206
1207 reply = calloc(num_msg, sizeof *reply);
1208 if (reply == NULL)
1209 return PAM_BUF_ERR;
1210
1211 for (i = 0; i < num_msg; i++) {
1212 switch (msg[i]->msg_style) {
1213 case PAM_PROMPT_ECHO_ON: /* assume want user name */
1214 reply[i].resp_retcode = PAM_SUCCESS;
1215 reply[i].resp = COPY_STRING(cred->uname);
1216 /* PAM frees resp. */
1217 break;
1218 case PAM_PROMPT_ECHO_OFF: /* assume want password */
1219 reply[i].resp_retcode = PAM_SUCCESS;
1220 reply[i].resp = COPY_STRING(cred->pass);
1221 /* PAM frees resp. */
1222 break;
1223 case PAM_TEXT_INFO:
1224 case PAM_ERROR_MSG:
1225 reply[i].resp_retcode = PAM_SUCCESS;
1226 reply[i].resp = NULL;
1227 break;
1228 default: /* unknown message style */
1229 free(reply);
1230 return PAM_CONV_ERR;
1231 }
1232 }
1233
1234 *resp = reply;
1235 return PAM_SUCCESS;
1236 }
1237
1238 /*
1239 * Attempt to authenticate the user using PAM. Returns 0 if the user is
1240 * authenticated, or 1 if not authenticated. If some sort of PAM system
1241 * error occurs (e.g., the "/etc/pam.conf" file is missing) then this
1242 * function returns -1. This can be used as an indication that we should
1243 * fall back to a different authentication mechanism.
1244 */
1245 static int
1246 auth_pam(struct passwd **ppw, const char *pass)
1247 {
1248 const char *tmpl_user;
1249 const void *item;
1250 int rval;
1251 int e;
1252 cred_t auth_cred = { (*ppw)->pw_name, pass };
1253 struct pam_conv conv = { &auth_conv, &auth_cred };
1254
1255 e = pam_start("ftpd", (*ppw)->pw_name, &conv, &pamh);
1256 if (e != PAM_SUCCESS) {
1257 /*
1258 * In OpenPAM, it's OK to pass NULL to pam_strerror()
1259 * if context creation has failed in the first place.
1260 */
1261 syslog(LOG_ERR, "pam_start: %s", pam_strerror(NULL, e));
1262 return -1;
1263 }
1264
1265 e = pam_set_item(pamh, PAM_RHOST, remotehost);
1266 if (e != PAM_SUCCESS) {
1267 syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s",
1268 pam_strerror(pamh, e));
1269 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) {
1270 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e));
1271 }
1272 pamh = NULL;
1273 return -1;
1274 }
1275
1276 e = pam_authenticate(pamh, 0);
1277 switch (e) {
1278 case PAM_SUCCESS:
1279 /*
1280 * With PAM we support the concept of a "template"
1281 * user. The user enters a login name which is
1282 * authenticated by PAM, usually via a remote service
1283 * such as RADIUS or TACACS+. If authentication
1284 * succeeds, a different but related "template" name
1285 * is used for setting the credentials, shell, and
1286 * home directory. The name the user enters need only
1287 * exist on the remote authentication server, but the
1288 * template name must be present in the local password
1289 * database.
1290 *
1291 * This is supported by two various mechanisms in the
1292 * individual modules. However, from the application's
1293 * point of view, the template user is always passed
1294 * back as a changed value of the PAM_USER item.
1295 */
1296 if ((e = pam_get_item(pamh, PAM_USER, &item)) ==
1297 PAM_SUCCESS) {
1298 tmpl_user = (const char *) item;
1299 if (strcmp((*ppw)->pw_name, tmpl_user) != 0)
1300 *ppw = getpwnam(tmpl_user);
1301 } else
1302 syslog(LOG_ERR, "Couldn't get PAM_USER: %s",
1303 pam_strerror(pamh, e));
1304 rval = 0;
1305 break;
1306
1307 case PAM_AUTH_ERR:
1308 case PAM_USER_UNKNOWN:
1309 case PAM_MAXTRIES:
1310 rval = 1;
1311 break;
1312
1313 default:
1314 syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e));
1315 rval = -1;
1316 break;
1317 }
1318
1319 if (rval == 0) {
1320 e = pam_acct_mgmt(pamh, 0);
1321 if (e != PAM_SUCCESS) {
1322 syslog(LOG_ERR, "pam_acct_mgmt: %s",
1323 pam_strerror(pamh, e));
1324 rval = 1;
1325 }
1326 }
1327
1328 if (rval != 0) {
1329 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) {
1330 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e));
1331 }
1332 pamh = NULL;
1333 }
1334 return rval;
1335 }
1336
1337 #endif /* USE_PAM */
1338
1339 void
1340 pass(char *passwd)
1341 {
1342 int rval;
1343 FILE *fd;
1344 #ifdef LOGIN_CAP
1345 login_cap_t *lc = NULL;
1346 #endif
1347 #ifdef USE_PAM
1348 int e;
1349 #endif
1350 char *residue = NULL;
1351 char *xpasswd;
1352
1353 if (logged_in || askpasswd == 0) {
1354 reply(503, "Login with USER first.");
1355 return;
1356 }
1357 askpasswd = 0;
1358 if (!guest) { /* "ftp" is only account allowed no password */
1359 if (pw == NULL) {
1360 rval = 1; /* failure below */
1361 goto skip;
1362 }
1363 #ifdef USE_PAM
1364 rval = auth_pam(&pw, passwd);
1365 if (rval >= 0) {
1366 opieunlock();
1367 goto skip;
1368 }
1369 #endif
1370 if (opieverify(&opiedata, passwd) == 0)
1371 xpasswd = pw->pw_passwd;
1372 else if (pwok) {
1373 xpasswd = crypt(passwd, pw->pw_passwd);
1374 if (passwd[0] == '\0' && pw->pw_passwd[0] != '\0')
1375 xpasswd = ":";
1376 } else {
1377 rval = 1;
1378 goto skip;
1379 }
1380 rval = strcmp(pw->pw_passwd, xpasswd);
1381 if (pw->pw_expire && time(NULL) >= pw->pw_expire)
1382 rval = 1; /* failure */
1383 skip:
1384 /*
1385 * If rval == 1, the user failed the authentication check
1386 * above. If rval == 0, either PAM or local authentication
1387 * succeeded.
1388 */
1389 if (rval) {
1390 reply(530, "Login incorrect.");
1391 if (logging) {
1392 syslog(LOG_NOTICE,
1393 "FTP LOGIN FAILED FROM %s",
1394 remotehost);
1395 syslog(LOG_AUTHPRIV | LOG_NOTICE,
1396 "FTP LOGIN FAILED FROM %s, %s",
1397 remotehost, curname);
1398 }
1399 pw = NULL;
1400 if (login_attempts++ >= 5) {
1401 syslog(LOG_NOTICE,
1402 "repeated login failures from %s",
1403 remotehost);
1404 exit(0);
1405 }
1406 return;
1407 }
1408 }
1409 login_attempts = 0; /* this time successful */
1410 if (setegid(pw->pw_gid) < 0) {
1411 reply(550, "Can't set gid.");
1412 return;
1413 }
1414 /* May be overridden by login.conf */
1415 umask(defumask);
1416 #ifdef LOGIN_CAP
1417 if ((lc = login_getpwclass(pw)) != NULL) {
1418 char remote_ip[NI_MAXHOST];
1419
1420 if (getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len,
1421 remote_ip, sizeof(remote_ip) - 1, NULL, 0,
1422 NI_NUMERICHOST))
1423 *remote_ip = 0;
1424 remote_ip[sizeof(remote_ip) - 1] = 0;
1425 if (!auth_hostok(lc, remotehost, remote_ip)) {
1426 syslog(LOG_INFO|LOG_AUTH,
1427 "FTP LOGIN FAILED (HOST) as %s: permission denied.",
1428 pw->pw_name);
1429 reply(530, "Permission denied.");
1430 pw = NULL;
1431 return;
1432 }
1433 if (!auth_timeok(lc, time(NULL))) {
1434 reply(530, "Login not available right now.");
1435 pw = NULL;
1436 return;
1437 }
1438 }
1439 /* XXX Missing LOGIN_SETMAC */
1440 setusercontext(lc, pw, 0,
1441 LOGIN_SETLOGIN|LOGIN_SETGROUP|LOGIN_SETPRIORITY|
1442 LOGIN_SETRESOURCES|LOGIN_SETUMASK);
1443 #else
1444 setlogin(pw->pw_name);
1445 initgroups(pw->pw_name, pw->pw_gid);
1446 #endif
1447
1448 #ifdef USE_PAM
1449 if (pamh) {
1450 if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) {
1451 syslog(LOG_ERR, "pam_open_session: %s", pam_strerror(pamh, e));
1452 } else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED)) != PAM_SUCCESS) {
1453 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e));
1454 }
1455 }
1456 #endif
1457
1458 /* open wtmp before chroot */
1459 if (dowtmp)
1460 ftpd_logwtmp(ttyline, pw->pw_name,
1461 (struct sockaddr *)&his_addr);
1462 logged_in = 1;
1463
1464 if (guest && stats && statfd < 0)
1465 #ifdef VIRTUAL_HOSTING
1466 statfd = open(thishost->statfile, O_WRONLY|O_APPEND);
1467 #else
1468 statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND);
1469 #endif
1470 if (statfd < 0)
1471 stats = 0;
1472
1473 dochroot =
1474 checkuser(_PATH_FTPCHROOT, pw->pw_name, 1, &residue)
1475 #ifdef LOGIN_CAP /* Allow login.conf configuration as well */
1476 || login_getcapbool(lc, "ftp-chroot", 0)
1477 #endif
1478 ;
1479 chrootdir = NULL;
1480 /*
1481 * For a chrooted local user,
1482 * a) see whether ftpchroot(5) specifies a chroot directory,
1483 * b) extract the directory pathname from the line,
1484 * c) expand it to the absolute pathname if necessary.
1485 */
1486 if (dochroot && residue &&
1487 (chrootdir = strtok(residue, " \t")) != NULL) {
1488 if (chrootdir[0] != '/')
1489 asprintf(&chrootdir, "%s/%s", pw->pw_dir, chrootdir);
1490 else
1491 chrootdir = strdup(chrootdir); /* make it permanent */
1492 if (chrootdir == NULL)
1493 fatalerror("Ran out of memory.");
1494 }
1495 if (guest || dochroot) {
1496 /*
1497 * If no chroot directory set yet, use the login directory.
1498 * Copy it so it can be modified while pw->pw_dir stays intact.
1499 */
1500 if (chrootdir == NULL &&
1501 (chrootdir = strdup(pw->pw_dir)) == NULL)
1502 fatalerror("Ran out of memory.");
1503 /*
1504 * Check for the "/chroot/./home" syntax,
1505 * separate the chroot and home directory pathnames.
1506 */
1507 if ((homedir = strstr(chrootdir, "/./")) != NULL) {
1508 *(homedir++) = '\0'; /* wipe '/' */
1509 homedir++; /* skip '.' */
1510 } else {
1511 /*
1512 * We MUST do a chdir() after the chroot. Otherwise
1513 * the old current directory will be accessible as "."
1514 * outside the new root!
1515 */
1516 homedir = "/";
1517 }
1518 /*
1519 * Finally, do chroot()
1520 */
1521 if (chroot(chrootdir) < 0) {
1522 reply(550, "Can't change root.");
1523 goto bad;
1524 }
1525 } else /* real user w/o chroot */
1526 homedir = pw->pw_dir;
1527 /*
1528 * Set euid *before* doing chdir() so
1529 * a) the user won't be carried to a directory that he couldn't reach
1530 * on his own due to no permission to upper path components,
1531 * b) NFS mounted homedirs w/restrictive permissions will be accessible
1532 * (uid 0 has no root power over NFS if not mapped explicitly.)
1533 */
1534 if (seteuid(pw->pw_uid) < 0) {
1535 reply(550, "Can't set uid.");
1536 goto bad;
1537 }
1538 if (chdir(homedir) < 0) {
1539 if (guest || dochroot) {
1540 reply(550, "Can't change to base directory.");
1541 goto bad;
1542 } else {
1543 if (chdir("/") < 0) {
1544 reply(550, "Root is inaccessible.");
1545 goto bad;
1546 }
1547 lreply(230, "No directory! Logging in with home=/.");
1548 }
1549 }
1550
1551 /*
1552 * Display a login message, if it exists.
1553 * N.B. reply(230,) must follow the message.
1554 */
1555 #ifdef VIRTUAL_HOSTING
1556 fd = fopen(thishost->loginmsg, "r");
1557 #else
1558 fd = fopen(_PATH_FTPLOGINMESG, "r");
1559 #endif
1560 if (fd != NULL) {
1561 char *cp, line[LINE_MAX];
1562
1563 while (fgets(line, sizeof(line), fd) != NULL) {
1564 if ((cp = strchr(line, '\n')) != NULL)
1565 *cp = '\0';
1566 lreply(230, "%s", line);
1567 }
1568 fflush(stdout);
1569 fclose(fd);
1570 }
1571 if (guest) {
1572 if (ident != NULL)
1573 free(ident);
1574 ident = strdup(passwd);
1575 if (ident == NULL)
1576 fatalerror("Ran out of memory.");
1577
1578 reply(230, "Guest login ok, access restrictions apply.");
1579 #ifdef SETPROCTITLE
1580 #ifdef VIRTUAL_HOSTING
1581 if (thishost != firsthost)
1582 snprintf(proctitle, sizeof(proctitle),
1583 "%s: anonymous(%s)/%s", remotehost, hostname,
1584 passwd);
1585 else
1586 #endif
1587 snprintf(proctitle, sizeof(proctitle),
1588 "%s: anonymous/%s", remotehost, passwd);
1589 setproctitle("%s", proctitle);
1590 #endif /* SETPROCTITLE */
1591 if (logging)
1592 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s",
1593 remotehost, passwd);
1594 } else {
1595 if (dochroot)
1596 reply(230, "User %s logged in, "
1597 "access restrictions apply.", pw->pw_name);
1598 else
1599 reply(230, "User %s logged in.", pw->pw_name);
1600
1601 #ifdef SETPROCTITLE
1602 snprintf(proctitle, sizeof(proctitle),
1603 "%s: user/%s", remotehost, pw->pw_name);
1604 setproctitle("%s", proctitle);
1605 #endif /* SETPROCTITLE */
1606 if (logging)
1607 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s",
1608 remotehost, pw->pw_name);
1609 }
1610 if (logging && (guest || dochroot))
1611 syslog(LOG_INFO, "session root changed to %s", chrootdir);
1612 #ifdef LOGIN_CAP
1613 login_close(lc);
1614 #endif
1615 if (residue)
1616 free(residue);
1617 return;
1618 bad:
1619 /* Forget all about it... */
1620 #ifdef LOGIN_CAP
1621 login_close(lc);
1622 #endif
1623 if (residue)
1624 free(residue);
1625 end_login();
1626 }
1627
1628 void
1629 retrieve(char *cmd, char *name)
1630 {
1631 FILE *fin, *dout;
1632 struct stat st;
1633 int (*closefunc)(FILE *);
1634 time_t start;
1635
1636 if (cmd == NULL) {
1637 fin = fopen(name, "r"), closefunc = fclose;
1638 st.st_size = 0;
1639 } else {
1640 char line[BUFSIZ];
1641
1642 snprintf(line, sizeof(line), cmd, name), name = line;
1643 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose;
1644 st.st_size = -1;
1645 st.st_blksize = BUFSIZ;
1646 }
1647 if (fin == NULL) {
1648 if (errno != 0) {
1649 perror_reply(550, name);
1650 if (cmd == NULL) {
1651 LOGCMD("get", name);
1652 }
1653 }
1654 return;
1655 }
1656 byte_count = -1;
1657 if (cmd == NULL) {
1658 if (fstat(fileno(fin), &st) < 0) {
1659 perror_reply(550, name);
1660 goto done;
1661 }
1662 if (!S_ISREG(st.st_mode)) {
1663 /*
1664 * Never sending a raw directory is a workaround
1665 * for buggy clients that will attempt to RETR
1666 * a directory before listing it, e.g., Mozilla.
1667 * Preventing a guest from getting irregular files
1668 * is a simple security measure.
1669 */
1670 if (S_ISDIR(st.st_mode) || guest) {
1671 reply(550, "%s: not a plain file.", name);
1672 goto done;
1673 }
1674 st.st_size = -1;
1675 /* st.st_blksize is set for all descriptor types */
1676 }
1677 }
1678 if (restart_point) {
1679 if (type == TYPE_A) {
1680 off_t i, n;
1681 int c;
1682
1683 n = restart_point;
1684 i = 0;
1685 while (i++ < n) {
1686 if ((c=getc(fin)) == EOF) {
1687 perror_reply(550, name);
1688 goto done;
1689 }
1690 if (c == '\n')
1691 i++;
1692 }
1693 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) {
1694 perror_reply(550, name);
1695 goto done;
1696 }
1697 }
1698 dout = dataconn(name, st.st_size, "w");
1699 if (dout == NULL)
1700 goto done;
1701 time(&start);
1702 send_data(fin, dout, st.st_blksize, st.st_size,
1703 restart_point == 0 && cmd == NULL && S_ISREG(st.st_mode));
1704 if (cmd == NULL && guest && stats && byte_count > 0)
1705 logxfer(name, byte_count, start);
1706 fclose(dout);
1707 data = -1;
1708 pdata = -1;
1709 done:
1710 if (cmd == NULL)
1711 LOGBYTES("get", name, byte_count);
1712 (*closefunc)(fin);
1713 }
1714
1715 void
1716 store(char *name, char *mode, int unique)
1717 {
1718 int fd;
1719 FILE *fout, *din;
1720 int (*closefunc)(FILE *);
1721
1722 if (*mode == 'a') { /* APPE */
1723 if (unique) {
1724 /* Programming error */
1725 syslog(LOG_ERR, "Internal: unique flag to APPE");
1726 unique = 0;
1727 }
1728 if (guest && noguestmod) {
1729 reply(550, "Appending to existing file denied.");
1730 goto err;
1731 }
1732 restart_point = 0; /* not affected by preceding REST */
1733 }
1734 if (unique) /* STOU overrides REST */
1735 restart_point = 0;
1736 if (guest && noguestmod) {
1737 if (restart_point) { /* guest STOR w/REST */
1738 reply(550, "Modifying existing file denied.");
1739 goto err;
1740 } else /* treat guest STOR as STOU */
1741 unique = 1;
1742 }
1743
1744 if (restart_point)
1745 mode = "r+"; /* so ASCII manual seek can work */
1746 if (unique) {
1747 if ((fd = guniquefd(name, &name)) < 0)
1748 goto err;
1749 fout = fdopen(fd, mode);
1750 } else
1751 fout = fopen(name, mode);
1752 closefunc = fclose;
1753 if (fout == NULL) {
1754 perror_reply(553, name);
1755 goto err;
1756 }
1757 byte_count = -1;
1758 if (restart_point) {
1759 if (type == TYPE_A) {
1760 off_t i, n;
1761 int c;
1762
1763 n = restart_point;
1764 i = 0;
1765 while (i++ < n) {
1766 if ((c=getc(fout)) == EOF) {
1767 perror_reply(550, name);
1768 goto done;
1769 }
1770 if (c == '\n')
1771 i++;
1772 }
1773 /*
1774 * We must do this seek to "current" position
1775 * because we are changing from reading to
1776 * writing.
1777 */
1778 if (fseeko(fout, 0, SEEK_CUR) < 0) {
1779 perror_reply(550, name);
1780 goto done;
1781 }
1782 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) {
1783 perror_reply(550, name);
1784 goto done;
1785 }
1786 }
1787 din = dataconn(name, -1, "r");
1788 if (din == NULL)
1789 goto done;
1790 if (receive_data(din, fout) == 0) {
1791 if (unique)
1792 reply(226, "Transfer complete (unique file name:%s).",
1793 name);
1794 else
1795 reply(226, "Transfer complete.");
1796 }
1797 fclose(din);
1798 data = -1;
1799 pdata = -1;
1800 done:
1801 LOGBYTES(*mode == 'a' ? "append" : "put", name, byte_count);
1802 (*closefunc)(fout);
1803 return;
1804 err:
1805 LOGCMD(*mode == 'a' ? "append" : "put" , name);
1806 return;
1807 }
1808
1809 static FILE *
1810 getdatasock(char *mode)
1811 {
1812 int on = 1, s, t, tries;
1813
1814 if (data >= 0)
1815 return (fdopen(data, mode));
1816
1817 s = socket(data_dest.su_family, SOCK_STREAM, 0);
1818 if (s < 0)
1819 goto bad;
1820 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
1821 syslog(LOG_WARNING, "data setsockopt (SO_REUSEADDR): %m");
1822 /* anchor socket to avoid multi-homing problems */
1823 data_source = ctrl_addr;
1824 data_source.su_port = htons(dataport);
1825 seteuid(0);
1826 for (tries = 1; ; tries++) {
1827 /*
1828 * We should loop here since it's possible that
1829 * another ftpd instance has passed this point and is
1830 * trying to open a data connection in active mode now.
1831 * Until the other connection is opened, we'll be getting
1832 * EADDRINUSE because no SOCK_STREAM sockets in the system
1833 * can share both local and remote addresses, localIP:20
1834 * and *:* in this case.
1835 */
1836 if (bind(s, (struct sockaddr *)&data_source,
1837 data_source.su_len) >= 0)
1838 break;
1839 if (errno != EADDRINUSE || tries > 10)
1840 goto bad;
1841 sleep(tries);
1842 }
1843 seteuid(pw->pw_uid);
1844 #ifdef IP_TOS
1845 if (data_source.su_family == AF_INET)
1846 {
1847 on = IPTOS_THROUGHPUT;
1848 if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, sizeof(int)) < 0)
1849 syslog(LOG_WARNING, "data setsockopt (IP_TOS): %m");
1850 }
1851 #endif
1852 #ifdef TCP_NOPUSH
1853 /*
1854 * Turn off push flag to keep sender TCP from sending short packets
1855 * at the boundaries of each write().
1856 */
1857 on = 1;
1858 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof on) < 0)
1859 syslog(LOG_WARNING, "data setsockopt (TCP_NOPUSH): %m");
1860 #endif
1861 return (fdopen(s, mode));
1862 bad:
1863 /* Return the real value of errno (close may change it) */
1864 t = errno;
1865 seteuid(pw->pw_uid);
1866 close(s);
1867 errno = t;
1868 return (NULL);
1869 }
1870
1871 static FILE *
1872 dataconn(char *name, off_t size, char *mode)
1873 {
1874 char sizebuf[32];
1875 FILE *file;
1876 int retry = 0, tos, conerrno;
1877
1878 file_size = size;
1879 byte_count = 0;
1880 if (size != -1)
1881 snprintf(sizebuf, sizeof(sizebuf),
1882 " (%jd bytes)", (intmax_t)size);
1883 else
1884 *sizebuf = '\0';
1885 if (pdata >= 0) {
1886 union sockunion from;
1887 socklen_t fromlen = ctrl_addr.su_len;
1888 int flags, s;
1889 struct timeval timeout;
1890 fd_set set;
1891
1892 FD_ZERO(&set);
1893 FD_SET(pdata, &set);
1894
1895 timeout.tv_usec = 0;
1896 timeout.tv_sec = 120;
1897
1898 /*
1899 * Granted a socket is in the blocking I/O mode,
1900 * accept() will block after a successful select()
1901 * if the selected connection dies in between.
1902 * Therefore set the non-blocking I/O flag here.
1903 */
1904 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 ||
1905 fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1)
1906 goto pdata_err;
1907 if (select(pdata+1, &set, NULL, NULL, &timeout) <= 0 ||
1908 (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0)
1909 goto pdata_err;
1910 close(pdata);
1911 pdata = s;
1912 /*
1913 * Unset the inherited non-blocking I/O flag
1914 * on the child socket so stdio can work on it.
1915 */
1916 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 ||
1917 fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1)
1918 goto pdata_err;
1919 #ifdef IP_TOS
1920 if (from.su_family == AF_INET)
1921 {
1922 tos = IPTOS_THROUGHPUT;
1923 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0)
1924 syslog(LOG_WARNING, "pdata setsockopt (IP_TOS): %m");
1925 }
1926 #endif
1927 reply(150, "Opening %s mode data connection for '%s'%s.",
1928 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf);
1929 return (fdopen(pdata, mode));
1930 pdata_err:
1931 reply(425, "Can't open data connection.");
1932 close(pdata);
1933 pdata = -1;
1934 return (NULL);
1935 }
1936 if (data >= 0) {
1937 reply(125, "Using existing data connection for '%s'%s.",
1938 name, sizebuf);
1939 usedefault = 1;
1940 return (fdopen(data, mode));
1941 }
1942 if (usedefault)
1943 data_dest = his_addr;
1944 usedefault = 1;
1945 do {
1946 file = getdatasock(mode);
1947 if (file == NULL) {
1948 char hostbuf[NI_MAXHOST], portbuf[NI_MAXSERV];
1949
1950 if (getnameinfo((struct sockaddr *)&data_source,
1951 data_source.su_len,
1952 hostbuf, sizeof(hostbuf) - 1,
1953 portbuf, sizeof(portbuf) - 1,
1954 NI_NUMERICHOST|NI_NUMERICSERV))
1955 *hostbuf = *portbuf = 0;
1956 hostbuf[sizeof(hostbuf) - 1] = 0;
1957 portbuf[sizeof(portbuf) - 1] = 0;
1958 reply(425, "Can't create data socket (%s,%s): %s.",
1959 hostbuf, portbuf, strerror(errno));
1960 return (NULL);
1961 }
1962 data = fileno(file);
1963 conerrno = 0;
1964 if (connect(data, (struct sockaddr *)&data_dest,
1965 data_dest.su_len) == 0)
1966 break;
1967 conerrno = errno;
1968 fclose(file);
1969 data = -1;
1970 if (conerrno == EADDRINUSE) {
1971 sleep(swaitint);
1972 retry += swaitint;
1973 } else {
1974 break;
1975 }
1976 } while (retry <= swaitmax);
1977 if (conerrno != 0) {
1978 reply(425, "Can't build data connection: %s.",
1979 strerror(conerrno));
1980 return (NULL);
1981 }
1982 reply(150, "Opening %s mode data connection for '%s'%s.",
1983 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf);
1984 return (file);
1985 }
1986
1987 /*
1988 * A helper macro to avoid code duplication
1989 * in send_data() and receive_data().
1990 *
1991 * XXX We have to block SIGURG during putc() because BSD stdio
1992 * is unable to restart interrupted write operations and hence
1993 * the entire buffer contents will be lost as soon as a write()
1994 * call indicates EINTR to stdio.
1995 */
1996 #define FTPD_PUTC(ch, file, label) \
1997 do { \
1998 int ret; \
1999 \
2000 do { \
2001 START_UNSAFE; \
2002 ret = putc((ch), (file)); \
2003 END_UNSAFE; \
2004 CHECKOOB(return (-1)) \
2005 else if (ferror(file)) \
2006 goto label; \
2007 clearerr(file); \
2008 } while (ret == EOF); \
2009 } while (0)
2010
2011 /*
2012 * Tranfer the contents of "instr" to "outstr" peer using the appropriate
2013 * encapsulation of the data subject to Mode, Structure, and Type.
2014 *
2015 * NB: Form isn't handled.
2016 */
2017 static int
2018 send_data(FILE *instr, FILE *outstr, size_t blksize, off_t filesize, int isreg)
2019 {
2020 int c, cp, filefd, netfd;
2021 char *buf;
2022
2023 STARTXFER;
2024
2025 switch (type) {
2026
2027 case TYPE_A:
2028 cp = EOF;
2029 for (;;) {
2030 c = getc(instr);
2031 CHECKOOB(return (-1))
2032 else if (c == EOF && ferror(instr))
2033 goto file_err;
2034 if (c == EOF) {
2035 if (ferror(instr)) { /* resume after OOB */
2036 clearerr(instr);
2037 continue;
2038 }
2039 if (feof(instr)) /* EOF */
2040 break;
2041 syslog(LOG_ERR, "Internal: impossible condition"
2042 " on file after getc()");
2043 goto file_err;
2044 }
2045 if (c == '\n' && cp != '\r') {
2046 FTPD_PUTC('\r', outstr, data_err);
2047 byte_count++;
2048 }
2049 FTPD_PUTC(c, outstr, data_err);
2050 byte_count++;
2051 cp = c;
2052 }
2053 #ifdef notyet /* BSD stdio isn't ready for that */
2054 while (fflush(outstr) == EOF) {
2055 CHECKOOB(return (-1))
2056 else
2057 goto data_err;
2058 clearerr(outstr);
2059 }
2060 ENDXFER;
2061 #else
2062 ENDXFER;
2063 if (fflush(outstr) == EOF)
2064 goto data_err;
2065 #endif
2066 reply(226, "Transfer complete.");
2067 return (0);
2068
2069 case TYPE_I:
2070 case TYPE_L:
2071 /*
2072 * isreg is only set if we are not doing restart and we
2073 * are sending a regular file
2074 */
2075 netfd = fileno(outstr);
2076 filefd = fileno(instr);
2077
2078 if (isreg) {
2079 char *msg = "Transfer complete.";
2080 off_t cnt, offset;
2081 int err;
2082
2083 cnt = offset = 0;
2084
2085 while (filesize > 0) {
2086 err = sendfile(filefd, netfd, offset, 0,
2087 NULL, &cnt, 0);
2088 /*
2089 * Calculate byte_count before OOB processing.
2090 * It can be used in myoob() later.
2091 */
2092 byte_count += cnt;
2093 offset += cnt;
2094 filesize -= cnt;
2095 CHECKOOB(return (-1))
2096 else if (err == -1) {
2097 if (errno != EINTR &&
2098 cnt == 0 && offset == 0)
2099 goto oldway;
2100 goto data_err;
2101 }
2102 if (err == -1) /* resume after OOB */
2103 continue;
2104 /*
2105 * We hit the EOF prematurely.
2106 * Perhaps the file was externally truncated.
2107 */
2108 if (cnt == 0) {
2109 msg = "Transfer finished due to "
2110 "premature end of file.";
2111 break;
2112 }
2113 }
2114 ENDXFER;
2115 reply(226, "%s", msg);
2116 return (0);
2117 }
2118
2119 oldway:
2120 if ((buf = malloc(blksize)) == NULL) {
2121 ENDXFER;
2122 reply(451, "Ran out of memory.");
2123 return (-1);
2124 }
2125
2126 for (;;) {
2127 int cnt, len;
2128 char *bp;
2129
2130 cnt = read(filefd, buf, blksize);
2131 CHECKOOB(free(buf); return (-1))
2132 else if (cnt < 0) {
2133 free(buf);
2134 goto file_err;
2135 }
2136 if (cnt < 0) /* resume after OOB */
2137 continue;
2138 if (cnt == 0) /* EOF */
2139 break;
2140 for (len = cnt, bp = buf; len > 0;) {
2141 cnt = write(netfd, bp, len);
2142 CHECKOOB(free(buf); return (-1))
2143 else if (cnt < 0) {
2144 free(buf);
2145 goto data_err;
2146 }
2147 if (cnt <= 0)
2148 continue;
2149 len -= cnt;
2150 bp += cnt;
2151 byte_count += cnt;
2152 }
2153 }
2154 ENDXFER;
2155 free(buf);
2156 reply(226, "Transfer complete.");
2157 return (0);
2158 default:
2159 ENDXFER;
2160 reply(550, "Unimplemented TYPE %d in send_data.", type);
2161 return (-1);
2162 }
2163
2164 data_err:
2165 ENDXFER;
2166 perror_reply(426, "Data connection");
2167 return (-1);
2168
2169 file_err:
2170 ENDXFER;
2171 perror_reply(551, "Error on input file");
2172 return (-1);
2173 }
2174
2175 /*
2176 * Transfer data from peer to "outstr" using the appropriate encapulation of
2177 * the data subject to Mode, Structure, and Type.
2178 *
2179 * N.B.: Form isn't handled.
2180 */
2181 static int
2182 receive_data(FILE *instr, FILE *outstr)
2183 {
2184 int c, cp;
2185 int bare_lfs = 0;
2186
2187 STARTXFER;
2188
2189 switch (type) {
2190
2191 case TYPE_I:
2192 case TYPE_L:
2193 for (;;) {
2194 int cnt, len;
2195 char *bp;
2196 char buf[BUFSIZ];
2197
2198 cnt = read(fileno(instr), buf, sizeof(buf));
2199 CHECKOOB(return (-1))
2200 else if (cnt < 0)
2201 goto data_err;
2202 if (cnt < 0) /* resume after OOB */
2203 continue;
2204 if (cnt == 0) /* EOF */
2205 break;
2206 for (len = cnt, bp = buf; len > 0;) {
2207 cnt = write(fileno(outstr), bp, len);
2208 CHECKOOB(return (-1))
2209 else if (cnt < 0)
2210 goto file_err;
2211 if (cnt <= 0)
2212 continue;
2213 len -= cnt;
2214 bp += cnt;
2215 byte_count += cnt;
2216 }
2217 }
2218 ENDXFER;
2219 return (0);
2220
2221 case TYPE_E:
2222 ENDXFER;
2223 reply(553, "TYPE E not implemented.");
2224 return (-1);
2225
2226 case TYPE_A:
2227 cp = EOF;
2228 for (;;) {
2229 c = getc(instr);
2230 CHECKOOB(return (-1))
2231 else if (c == EOF && ferror(instr))
2232 goto data_err;
2233 if (c == EOF && ferror(instr)) { /* resume after OOB */
2234 clearerr(instr);
2235 continue;
2236 }
2237
2238 if (cp == '\r') {
2239 if (c != '\n')
2240 FTPD_PUTC('\r', outstr, file_err);
2241 } else
2242 if (c == '\n')
2243 bare_lfs++;
2244 if (c == '\r') {
2245 byte_count++;
2246 cp = c;
2247 continue;
2248 }
2249
2250 /* Check for EOF here in order not to lose last \r. */
2251 if (c == EOF) {
2252 if (feof(instr)) /* EOF */
2253 break;
2254 syslog(LOG_ERR, "Internal: impossible condition"
2255 " on data stream after getc()");
2256 goto data_err;
2257 }
2258
2259 byte_count++;
2260 FTPD_PUTC(c, outstr, file_err);
2261 cp = c;
2262 }
2263 #ifdef notyet /* BSD stdio isn't ready for that */
2264 while (fflush(outstr) == EOF) {
2265 CHECKOOB(return (-1))
2266 else
2267 goto file_err;
2268 clearerr(outstr);
2269 }
2270 ENDXFER;
2271 #else
2272 ENDXFER;
2273 if (fflush(outstr) == EOF)
2274 goto file_err;
2275 #endif
2276 if (bare_lfs) {
2277 lreply(226,
2278 "WARNING! %d bare linefeeds received in ASCII mode.",
2279 bare_lfs);
2280 printf(" File may not have transferred correctly.\r\n");
2281 }
2282 return (0);
2283 default:
2284 ENDXFER;
2285 reply(550, "Unimplemented TYPE %d in receive_data.", type);
2286 return (-1);
2287 }
2288
2289 data_err:
2290 ENDXFER;
2291 perror_reply(426, "Data connection");
2292 return (-1);
2293
2294 file_err:
2295 ENDXFER;
2296 perror_reply(452, "Error writing to file");
2297 return (-1);
2298 }
2299
2300 void
2301 statfilecmd(char *filename)
2302 {
2303 FILE *fin;
2304 int atstart;
2305 int c, code;
2306 char line[LINE_MAX];
2307 struct stat st;
2308
2309 code = lstat(filename, &st) == 0 && S_ISDIR(st.st_mode) ? 212 : 213;
2310 snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename);
2311 fin = ftpd_popen(line, "r");
2312 lreply(code, "Status of %s:", filename);
2313 atstart = 1;
2314 while ((c = getc(fin)) != EOF) {
2315 if (c == '\n') {
2316 if (ferror(stdout)){
2317 perror_reply(421, "Control connection");
2318 ftpd_pclose(fin);
2319 dologout(1);
2320 /* NOTREACHED */
2321 }
2322 if (ferror(fin)) {
2323 perror_reply(551, filename);
2324 ftpd_pclose(fin);
2325 return;
2326 }
2327 putc('\r', stdout);
2328 }
2329 /*
2330 * RFC 959 says neutral text should be prepended before
2331 * a leading 3-digit number followed by whitespace, but
2332 * many ftp clients can be confused by any leading digits,
2333 * as a matter of fact.
2334 */
2335 if (atstart && isdigit(c))
2336 putc(' ', stdout);
2337 putc(c, stdout);
2338 atstart = (c == '\n');
2339 }
2340 ftpd_pclose(fin);
2341 reply(code, "End of status.");
2342 }
2343
2344 void
2345 statcmd(void)
2346 {
2347 union sockunion *su;
2348 u_char *a, *p;
2349 char hname[NI_MAXHOST];
2350 int ispassive;
2351
2352 if (hostinfo) {
2353 lreply(211, "%s FTP server status:", hostname);
2354 printf(" %s\r\n", version);
2355 } else
2356 lreply(211, "FTP server status:");
2357 printf(" Connected to %s", remotehost);
2358 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len,
2359 hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST)) {
2360 hname[sizeof(hname) - 1] = 0;
2361 if (strcmp(hname, remotehost) != 0)
2362 printf(" (%s)", hname);
2363 }
2364 printf("\r\n");
2365 if (logged_in) {
2366 if (guest)
2367 printf(" Logged in anonymously\r\n");
2368 else
2369 printf(" Logged in as %s\r\n", pw->pw_name);
2370 } else if (askpasswd)
2371 printf(" Waiting for password\r\n");
2372 else
2373 printf(" Waiting for user name\r\n");
2374 printf(" TYPE: %s", typenames[type]);
2375 if (type == TYPE_A || type == TYPE_E)
2376 printf(", FORM: %s", formnames[form]);
2377 if (type == TYPE_L)
2378 #if CHAR_BIT == 8
2379 printf(" %d", CHAR_BIT);
2380 #else
2381 printf(" %d", bytesize); /* need definition! */
2382 #endif
2383 printf("; STRUcture: %s; transfer MODE: %s\r\n",
2384 strunames[stru], modenames[mode]);
2385 if (data != -1)
2386 printf(" Data connection open\r\n");
2387 else if (pdata != -1) {
2388 ispassive = 1;
2389 su = &pasv_addr;
2390 goto printaddr;
2391 } else if (usedefault == 0) {
2392 ispassive = 0;
2393 su = &data_dest;
2394 printaddr:
2395 #define UC(b) (((int) b) & 0xff)
2396 if (epsvall) {
2397 printf(" EPSV only mode (EPSV ALL)\r\n");
2398 goto epsvonly;
2399 }
2400
2401 /* PORT/PASV */
2402 if (su->su_family == AF_INET) {
2403 a = (u_char *) &su->su_sin.sin_addr;
2404 p = (u_char *) &su->su_sin.sin_port;
2405 printf(" %s (%d,%d,%d,%d,%d,%d)\r\n",
2406 ispassive ? "PASV" : "PORT",
2407 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]),
2408 UC(p[0]), UC(p[1]));
2409 }
2410
2411 /* LPRT/LPSV */
2412 {
2413 int alen, af, i;
2414
2415 switch (su->su_family) {
2416 case AF_INET:
2417 a = (u_char *) &su->su_sin.sin_addr;
2418 p = (u_char *) &su->su_sin.sin_port;
2419 alen = sizeof(su->su_sin.sin_addr);
2420 af = 4;
2421 break;
2422 case AF_INET6:
2423 a = (u_char *) &su->su_sin6.sin6_addr;
2424 p = (u_char *) &su->su_sin6.sin6_port;
2425 alen = sizeof(su->su_sin6.sin6_addr);
2426 af = 6;
2427 break;
2428 default:
2429 af = 0;
2430 break;
2431 }
2432 if (af) {
2433 printf(" %s (%d,%d,", ispassive ? "LPSV" : "LPRT",
2434 af, alen);
2435 for (i = 0; i < alen; i++)
2436 printf("%d,", UC(a[i]));
2437 printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1]));
2438 }
2439 }
2440
2441 epsvonly:;
2442 /* EPRT/EPSV */
2443 {
2444 int af;
2445
2446 switch (su->su_family) {
2447 case AF_INET:
2448 af = 1;
2449 break;
2450 case AF_INET6:
2451 af = 2;
2452 break;
2453 default:
2454 af = 0;
2455 break;
2456 }
2457 if (af) {
2458 union sockunion tmp;
2459
2460 tmp = *su;
2461 if (tmp.su_family == AF_INET6)
2462 tmp.su_sin6.sin6_scope_id = 0;
2463 if (!getnameinfo((struct sockaddr *)&tmp, tmp.su_len,
2464 hname, sizeof(hname) - 1, NULL, 0,
2465 NI_NUMERICHOST)) {
2466 hname[sizeof(hname) - 1] = 0;
2467 printf(" %s |%d|%s|%d|\r\n",
2468 ispassive ? "EPSV" : "EPRT",
2469 af, hname, htons(tmp.su_port));
2470 }
2471 }
2472 }
2473 #undef UC
2474 } else
2475 printf(" No data connection\r\n");
2476 reply(211, "End of status.");
2477 }
2478
2479 void
2480 fatalerror(char *s)
2481 {
2482
2483 reply(451, "Error in server: %s", s);
2484 reply(221, "Closing connection due to server error.");
2485 dologout(0);
2486 /* NOTREACHED */
2487 }
2488
2489 void
2490 reply(int n, const char *fmt, ...)
2491 {
2492 va_list ap;
2493
2494 printf("%d ", n);
2495 va_start(ap, fmt);
2496 vprintf(fmt, ap);
2497 va_end(ap);
2498 printf("\r\n");
2499 fflush(stdout);
2500 if (ftpdebug) {
2501 syslog(LOG_DEBUG, "<--- %d ", n);
2502 va_start(ap, fmt);
2503 vsyslog(LOG_DEBUG, fmt, ap);
2504 va_end(ap);
2505 }
2506 }
2507
2508 void
2509 lreply(int n, const char *fmt, ...)
2510 {
2511 va_list ap;
2512
2513 printf("%d- ", n);
2514 va_start(ap, fmt);
2515 vprintf(fmt, ap);
2516 va_end(ap);
2517 printf("\r\n");
2518 fflush(stdout);
2519 if (ftpdebug) {
2520 syslog(LOG_DEBUG, "<--- %d- ", n);
2521 va_start(ap, fmt);
2522 vsyslog(LOG_DEBUG, fmt, ap);
2523 va_end(ap);
2524 }
2525 }
2526
2527 static void
2528 ack(char *s)
2529 {
2530
2531 reply(250, "%s command successful.", s);
2532 }
2533
2534 void
2535 nack(char *s)
2536 {
2537
2538 reply(502, "%s command not implemented.", s);
2539 }
2540
2541 /* ARGSUSED */
2542 void
2543 yyerror(char *s)
2544 {
2545 char *cp;
2546
2547 if ((cp = strchr(cbuf,'\n')))
2548 *cp = '\0';
2549 reply(500, "%s: command not understood.", cbuf);
2550 }
2551
2552 void
2553 delete(char *name)
2554 {
2555 struct stat st;
2556
2557 LOGCMD("delete", name);
2558 if (lstat(name, &st) < 0) {
2559 perror_reply(550, name);
2560 return;
2561 }
2562 if (S_ISDIR(st.st_mode)) {
2563 if (rmdir(name) < 0) {
2564 perror_reply(550, name);
2565 return;
2566 }
2567 goto done;
2568 }
2569 if (guest && noguestmod) {
2570 reply(550, "Operation not permitted.");
2571 return;
2572 }
2573 if (unlink(name) < 0) {
2574 perror_reply(550, name);
2575 return;
2576 }
2577 done:
2578 ack("DELE");
2579 }
2580
2581 void
2582 cwd(char *path)
2583 {
2584
2585 if (chdir(path) < 0)
2586 perror_reply(550, path);
2587 else
2588 ack("CWD");
2589 }
2590
2591 void
2592 makedir(char *name)
2593 {
2594 char *s;
2595
2596 LOGCMD("mkdir", name);
2597 if (guest && noguestmkd)
2598 reply(550, "Operation not permitted.");
2599 else if (mkdir(name, 0777) < 0)
2600 perror_reply(550, name);
2601 else {
2602 if ((s = doublequote(name)) == NULL)
2603 fatalerror("Ran out of memory.");
2604 reply(257, "\"%s\" directory created.", s);
2605 free(s);
2606 }
2607 }
2608
2609 void
2610 removedir(char *name)
2611 {
2612
2613 LOGCMD("rmdir", name);
2614 if (rmdir(name) < 0)
2615 perror_reply(550, name);
2616 else
2617 ack("RMD");
2618 }
2619
2620 void
2621 pwd(void)
2622 {
2623 char *s, path[MAXPATHLEN + 1];
2624
2625 if (getcwd(path, sizeof(path)) == NULL)
2626 perror_reply(550, "Get current directory");
2627 else {
2628 if ((s = doublequote(path)) == NULL)
2629 fatalerror("Ran out of memory.");
2630 reply(257, "\"%s\" is current directory.", s);
2631 free(s);
2632 }
2633 }
2634
2635 char *
2636 renamefrom(char *name)
2637 {
2638 struct stat st;
2639
2640 if (guest && noguestmod) {
2641 reply(550, "Operation not permitted.");
2642 return (NULL);
2643 }
2644 if (lstat(name, &st) < 0) {
2645 perror_reply(550, name);
2646 return (NULL);
2647 }
2648 reply(350, "File exists, ready for destination name.");
2649 return (name);
2650 }
2651
2652 void
2653 renamecmd(char *from, char *to)
2654 {
2655 struct stat st;
2656
2657 LOGCMD2("rename", from, to);
2658
2659 if (guest && (stat(to, &st) == 0)) {
2660 reply(550, "%s: permission denied.", to);
2661 return;
2662 }
2663
2664 if (rename(from, to) < 0)
2665 perror_reply(550, "rename");
2666 else
2667 ack("RNTO");
2668 }
2669
2670 static void
2671 dolog(struct sockaddr *who)
2672 {
2673 char who_name[NI_MAXHOST];
2674
2675 realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len);
2676 remotehost[sizeof(remotehost) - 1] = 0;
2677 if (getnameinfo(who, who->sa_len,
2678 who_name, sizeof(who_name) - 1, NULL, 0, NI_NUMERICHOST))
2679 *who_name = 0;
2680 who_name[sizeof(who_name) - 1] = 0;
2681
2682 #ifdef SETPROCTITLE
2683 #ifdef VIRTUAL_HOSTING
2684 if (thishost != firsthost)
2685 snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)",
2686 remotehost, hostname);
2687 else
2688 #endif
2689 snprintf(proctitle, sizeof(proctitle), "%s: connected",
2690 remotehost);
2691 setproctitle("%s", proctitle);
2692 #endif /* SETPROCTITLE */
2693
2694 if (logging) {
2695 #ifdef VIRTUAL_HOSTING
2696 if (thishost != firsthost)
2697 syslog(LOG_INFO, "connection from %s (%s) to %s",
2698 remotehost, who_name, hostname);
2699 else
2700 #endif
2701 syslog(LOG_INFO, "connection from %s (%s)",
2702 remotehost, who_name);
2703 }
2704 }
2705
2706 /*
2707 * Record logout in wtmp file
2708 * and exit with supplied status.
2709 */
2710 void
2711 dologout(int status)
2712 {
2713
2714 if (logged_in && dowtmp) {
2715 seteuid(0);
2716 ftpd_logwtmp(ttyline, "", NULL);
2717 }
2718 /* beware of flushing buffers after a SIGPIPE */
2719 _exit(status);
2720 }
2721
2722 static void
2723 sigurg(int signo)
2724 {
2725
2726 recvurg = 1;
2727 }
2728
2729 static void
2730 maskurg(int flag)
2731 {
2732 int oerrno;
2733 sigset_t sset;
2734
2735 if (!transflag) {
2736 syslog(LOG_ERR, "Internal: maskurg() while no transfer");
2737 return;
2738 }
2739 oerrno = errno;
2740 sigemptyset(&sset);
2741 sigaddset(&sset, SIGURG);
2742 sigprocmask(flag ? SIG_BLOCK : SIG_UNBLOCK, &sset, NULL);
2743 errno = oerrno;
2744 }
2745
2746 static void
2747 flagxfer(int flag)
2748 {
2749
2750 if (flag) {
2751 if (transflag)
2752 syslog(LOG_ERR, "Internal: flagxfer(1): "
2753 "transfer already under way");
2754 transflag = 1;
2755 maskurg(0);
2756 recvurg = 0;
2757 } else {
2758 if (!transflag)
2759 syslog(LOG_ERR, "Internal: flagxfer(0): "
2760 "no active transfer");
2761 maskurg(1);
2762 transflag = 0;
2763 }
2764 }
2765
2766 /*
2767 * Returns 0 if OK to resume or -1 if abort requested.
2768 */
2769 static int
2770 myoob(void)
2771 {
2772 char *cp;
2773 int ret;
2774
2775 if (!transflag) {
2776 syslog(LOG_ERR, "Internal: myoob() while no transfer");
2777 return (0);
2778 }
2779 cp = tmpline;
2780 ret = get_line(cp, 7, stdin);
2781 if (ret == -1) {
2782 reply(221, "You could at least say goodbye.");
2783 dologout(0);
2784 } else if (ret == -2) {
2785 /* Ignore truncated command. */
2786 return (0);
2787 }
2788 upper(cp);
2789 if (strcmp(cp, "ABOR\r\n") == 0) {
2790 tmpline[0] = '\0';
2791 reply(426, "Transfer aborted. Data connection closed.");
2792 reply(226, "Abort successful.");
2793 return (-1);
2794 }
2795 if (strcmp(cp, "STAT\r\n") == 0) {
2796 tmpline[0] = '\0';
2797 if (file_size != -1)
2798 reply(213, "Status: %jd of %jd bytes transferred.",
2799 (intmax_t)byte_count, (intmax_t)file_size);
2800 else
2801 reply(213, "Status: %jd bytes transferred.",
2802 (intmax_t)byte_count);
2803 }
2804 return (0);
2805 }
2806
2807 /*
2808 * Note: a response of 425 is not mentioned as a possible response to
2809 * the PASV command in RFC959. However, it has been blessed as
2810 * a legitimate response by Jon Postel in a telephone conversation
2811 * with Rick Adams on 25 Jan 89.
2812 */
2813 void
2814 passive(void)
2815 {
2816 socklen_t len;
2817 int on;
2818 char *p, *a;
2819
2820 if (pdata >= 0) /* close old port if one set */
2821 close(pdata);
2822
2823 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0);
2824 if (pdata < 0) {
2825 perror_reply(425, "Can't open passive connection");
2826 return;
2827 }
2828 on = 1;
2829 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
2830 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m");
2831
2832 seteuid(0);
2833
2834 #ifdef IP_PORTRANGE
2835 if (ctrl_addr.su_family == AF_INET) {
2836 on = restricted_data_ports ? IP_PORTRANGE_HIGH
2837 : IP_PORTRANGE_DEFAULT;
2838
2839 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE,
2840 &on, sizeof(on)) < 0)
2841 goto pasv_error;
2842 }
2843 #endif
2844 #ifdef IPV6_PORTRANGE
2845 if (ctrl_addr.su_family == AF_INET6) {
2846 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH
2847 : IPV6_PORTRANGE_DEFAULT;
2848
2849 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE,
2850 &on, sizeof(on)) < 0)
2851 goto pasv_error;
2852 }
2853 #endif
2854
2855 pasv_addr = ctrl_addr;
2856 pasv_addr.su_port = 0;
2857 if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0)
2858 goto pasv_error;
2859
2860 seteuid(pw->pw_uid);
2861
2862 len = sizeof(pasv_addr);
2863 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0)
2864 goto pasv_error;
2865 if (listen(pdata, 1) < 0)
2866 goto pasv_error;
2867 if (pasv_addr.su_family == AF_INET)
2868 a = (char *) &pasv_addr.su_sin.sin_addr;
2869 else if (pasv_addr.su_family == AF_INET6 &&
2870 IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr))
2871 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12];
2872 else
2873 goto pasv_error;
2874
2875 p = (char *) &pasv_addr.su_port;
2876
2877 #define UC(b) (((int) b) & 0xff)
2878
2879 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]),
2880 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1]));
2881 return;
2882
2883 pasv_error:
2884 seteuid(pw->pw_uid);
2885 close(pdata);
2886 pdata = -1;
2887 perror_reply(425, "Can't open passive connection");
2888 return;
2889 }
2890
2891 /*
2892 * Long Passive defined in RFC 1639.
2893 * 228 Entering Long Passive Mode
2894 * (af, hal, h1, h2, h3,..., pal, p1, p2...)
2895 */
2896
2897 void
2898 long_passive(char *cmd, int pf)
2899 {
2900 socklen_t len;
2901 int on;
2902 char *p, *a;
2903
2904 if (pdata >= 0) /* close old port if one set */
2905 close(pdata);
2906
2907 if (pf != PF_UNSPEC) {
2908 if (ctrl_addr.su_family != pf) {
2909 switch (ctrl_addr.su_family) {
2910 case AF_INET:
2911 pf = 1;
2912 break;
2913 case AF_INET6:
2914 pf = 2;
2915 break;
2916 default:
2917 pf = 0;
2918 break;
2919 }
2920 /*
2921 * XXX
2922 * only EPRT/EPSV ready clients will understand this
2923 */
2924 if (strcmp(cmd, "EPSV") == 0 && pf) {
2925 reply(522, "Network protocol mismatch, "
2926 "use (%d)", pf);
2927 } else
2928 reply(501, "Network protocol mismatch."); /*XXX*/
2929
2930 return;
2931 }
2932 }
2933
2934 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0);
2935 if (pdata < 0) {
2936 perror_reply(425, "Can't open passive connection");
2937 return;
2938 }
2939 on = 1;
2940 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
2941 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m");
2942
2943 seteuid(0);
2944
2945 pasv_addr = ctrl_addr;
2946 pasv_addr.su_port = 0;
2947 len = pasv_addr.su_len;
2948
2949 #ifdef IP_PORTRANGE
2950 if (ctrl_addr.su_family == AF_INET) {
2951 on = restricted_data_ports ? IP_PORTRANGE_HIGH
2952 : IP_PORTRANGE_DEFAULT;
2953
2954 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE,
2955 &on, sizeof(on)) < 0)
2956 goto pasv_error;
2957 }
2958 #endif
2959 #ifdef IPV6_PORTRANGE
2960 if (ctrl_addr.su_family == AF_INET6) {
2961 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH
2962 : IPV6_PORTRANGE_DEFAULT;
2963
2964 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE,
2965 &on, sizeof(on)) < 0)
2966 goto pasv_error;
2967 }
2968 #endif
2969
2970 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0)
2971 goto pasv_error;
2972
2973 seteuid(pw->pw_uid);
2974
2975 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0)
2976 goto pasv_error;
2977 if (listen(pdata, 1) < 0)
2978 goto pasv_error;
2979
2980 #define UC(b) (((int) b) & 0xff)
2981
2982 if (strcmp(cmd, "LPSV") == 0) {
2983 p = (char *)&pasv_addr.su_port;
2984 switch (pasv_addr.su_family) {
2985 case AF_INET:
2986 a = (char *) &pasv_addr.su_sin.sin_addr;
2987 v4_reply:
2988 reply(228,
2989 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)",
2990 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]),
2991 2, UC(p[0]), UC(p[1]));
2992 return;
2993 case AF_INET6:
2994 if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) {
2995 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12];
2996 goto v4_reply;
2997 }
2998 a = (char *) &pasv_addr.su_sin6.sin6_addr;
2999 reply(228,
3000 "Entering Long Passive Mode "
3001 "(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)",
3002 6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]),
3003 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]),
3004 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]),
3005 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]),
3006 2, UC(p[0]), UC(p[1]));
3007 return;
3008 }
3009 } else if (strcmp(cmd, "EPSV") == 0) {
3010 switch (pasv_addr.su_family) {
3011 case AF_INET:
3012 case AF_INET6:
3013 reply(229, "Entering Extended Passive Mode (|||%d|)",
3014 ntohs(pasv_addr.su_port));
3015 return;
3016 }
3017 } else {
3018 /* more proper error code? */
3019 }
3020
3021 pasv_error:
3022 seteuid(pw->pw_uid);
3023 close(pdata);
3024 pdata = -1;
3025 perror_reply(425, "Can't open passive connection");
3026 return;
3027 }
3028
3029 /*
3030 * Generate unique name for file with basename "local"
3031 * and open the file in order to avoid possible races.
3032 * Try "local" first, then "local.1", "local.2" etc, up to "local.99".
3033 * Return descriptor to the file, set "name" to its name.
3034 *
3035 * Generates failure reply on error.
3036 */
3037 static int
3038 guniquefd(char *local, char **name)
3039 {
3040 static char new[MAXPATHLEN];
3041 struct stat st;
3042 char *cp;
3043 int count;
3044 int fd;
3045
3046 cp = strrchr(local, '/');
3047 if (cp)
3048 *cp = '\0';
3049 if (stat(cp ? local : ".", &st) < 0) {
3050 perror_reply(553, cp ? local : ".");
3051 return (-1);
3052 }
3053 if (cp) {
3054 /*
3055 * Let not overwrite dirname with counter suffix.
3056 * -4 is for /nn\0
3057 * In this extreme case dot won't be put in front of suffix.
3058 */
3059 if (strlen(local) > sizeof(new) - 4) {
3060 reply(553, "Pathname too long.");
3061 return (-1);
3062 }
3063 *cp = '/';
3064 }
3065 /* -4 is for the .nn<null> we put on the end below */
3066 snprintf(new, sizeof(new) - 4, "%s", local);
3067 cp = new + strlen(new);
3068 /*
3069 * Don't generate dotfile unless requested explicitly.
3070 * This covers the case when basename gets truncated off
3071 * by buffer size.
3072 */
3073 if (cp > new && cp[-1] != '/')
3074 *cp++ = '.';
3075 for (count = 0; count < 100; count++) {
3076 /* At count 0 try unmodified name */
3077 if (count)
3078 sprintf(cp, "%d", count);
3079 if ((fd = open(count ? new : local,
3080 O_RDWR | O_CREAT | O_EXCL, 0666)) >= 0) {
3081 *name = count ? new : local;
3082 return (fd);
3083 }
3084 if (errno != EEXIST) {
3085 perror_reply(553, count ? new : local);
3086 return (-1);
3087 }
3088 }
3089 reply(452, "Unique file name cannot be created.");
3090 return (-1);
3091 }
3092
3093 /*
3094 * Format and send reply containing system error number.
3095 */
3096 void
3097 perror_reply(int code, char *string)
3098 {
3099
3100 reply(code, "%s: %s.", string, strerror(errno));
3101 }
3102
3103 static char *onefile[] = {
3104 "",
3105 0
3106 };
3107
3108 void
3109 send_file_list(char *whichf)
3110 {
3111 struct stat st;
3112 DIR *dirp = NULL;
3113 struct dirent *dir;
3114 FILE *dout = NULL;
3115 char **dirlist, *dirname;
3116 int simple = 0;
3117 int freeglob = 0;
3118 glob_t gl;
3119
3120 if (strpbrk(whichf, "~{[*?") != NULL) {
3121 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE;
3122
3123 memset(&gl, 0, sizeof(gl));
3124 gl.gl_matchc = MAXGLOBARGS;
3125 /*flags |= GLOB_LIMIT;*/
3126 freeglob = 1;
3127 if (glob(whichf, flags, 0, &gl)) {
3128 reply(550, "No matching files found.");
3129 goto out;
3130 } else if (gl.gl_pathc == 0) {
3131 errno = ENOENT;
3132 perror_reply(550, whichf);
3133 goto out;
3134 }
3135 dirlist = gl.gl_pathv;
3136 } else {
3137 onefile[0] = whichf;
3138 dirlist = onefile;
3139 simple = 1;
3140 }
3141
3142 while ((dirname = *dirlist++)) {
3143 if (stat(dirname, &st) < 0) {
3144 /*
3145 * If user typed "ls -l", etc, and the client
3146 * used NLST, do what the user meant.
3147 */
3148 if (dirname[0] == '-' && *dirlist == NULL &&
3149 dout == NULL)
3150 retrieve(_PATH_LS " %s", dirname);
3151 else
3152 perror_reply(550, whichf);
3153 goto out;
3154 }
3155
3156 if (S_ISREG(st.st_mode)) {
3157 if (dout == NULL) {
3158 dout = dataconn("file list", -1, "w");
3159 if (dout == NULL)
3160 goto out;
3161 STARTXFER;
3162 }
3163 START_UNSAFE;
3164 fprintf(dout, "%s%s\n", dirname,
3165 type == TYPE_A ? "\r" : "");
3166 END_UNSAFE;
3167 if (ferror(dout))
3168 goto data_err;
3169 byte_count += strlen(dirname) +
3170 (type == TYPE_A ? 2 : 1);
3171 CHECKOOB(goto abrt);
3172 continue;
3173 } else if (!S_ISDIR(st.st_mode))
3174 continue;
3175
3176 if ((dirp = opendir(dirname)) == NULL)
3177 continue;
3178
3179 while ((dir = readdir(dirp)) != NULL) {
3180 char nbuf[MAXPATHLEN];
3181
3182 CHECKOOB(goto abrt);
3183
3184 if (strcmp(dir->d_name, ".") == 0)
3185 continue;
3186 if (strcmp(dir->d_name, "..") == 0)
3187 continue;
3188
3189 snprintf(nbuf, sizeof(nbuf),
3190 "%s/%s", dirname, dir->d_name);
3191
3192 /*
3193 * We have to do a stat to insure it's
3194 * not a directory or special file.
3195 */
3196 if (simple || (stat(nbuf, &st) == 0 &&
3197 S_ISREG(st.st_mode))) {
3198 if (dout == NULL) {
3199 dout = dataconn("file list", -1, "w");
3200 if (dout == NULL)
3201 goto out;
3202 STARTXFER;
3203 }
3204 START_UNSAFE;
3205 if (nbuf[0] == '.' && nbuf[1] == '/')
3206 fprintf(dout, "%s%s\n", &nbuf[2],
3207 type == TYPE_A ? "\r" : "");
3208 else
3209 fprintf(dout, "%s%s\n", nbuf,
3210 type == TYPE_A ? "\r" : "");
3211 END_UNSAFE;
3212 if (ferror(dout))
3213 goto data_err;
3214 byte_count += strlen(nbuf) +
3215 (type == TYPE_A ? 2 : 1);
3216 CHECKOOB(goto abrt);
3217 }
3218 }
3219 closedir(dirp);
3220 dirp = NULL;
3221 }
3222
3223 if (dout == NULL)
3224 reply(550, "No files found.");
3225 else if (ferror(dout))
3226 data_err: perror_reply(550, "Data connection");
3227 else
3228 reply(226, "Transfer complete.");
3229 out:
3230 if (dout) {
3231 ENDXFER;
3232 abrt:
3233 fclose(dout);
3234 data = -1;
3235 pdata = -1;
3236 }
3237 if (dirp)
3238 closedir(dirp);
3239 if (freeglob) {
3240 freeglob = 0;
3241 globfree(&gl);
3242 }
3243 }
3244
3245 void
3246 reapchild(int signo)
3247 {
3248 while (waitpid(-1, NULL, WNOHANG) > 0);
3249 }
3250
3251 static void
3252 appendf(char **strp, char *fmt, ...)
3253 {
3254 va_list ap;
3255 char *ostr, *p;
3256
3257 va_start(ap, fmt);
3258 vasprintf(&p, fmt, ap);
3259 va_end(ap);
3260 if (p == NULL)
3261 fatalerror("Ran out of memory.");
3262 if (*strp == NULL)
3263 *strp = p;
3264 else {
3265 ostr = *strp;
3266 asprintf(strp, "%s%s", ostr, p);
3267 if (*strp == NULL)
3268 fatalerror("Ran out of memory.");
3269 free(ostr);
3270 }
3271 }
3272
3273 static void
3274 logcmd(char *cmd, char *file1, char *file2, off_t cnt)
3275 {
3276 char *msg = NULL;
3277 char wd[MAXPATHLEN + 1];
3278
3279 if (logging <= 1)
3280 return;
3281
3282 if (getcwd(wd, sizeof(wd) - 1) == NULL)
3283 strcpy(wd, strerror(errno));
3284
3285 appendf(&msg, "%s", cmd);
3286 if (file1)
3287 appendf(&msg, " %s", file1);
3288 if (file2)
3289 appendf(&msg, " %s", file2);
3290 if (cnt >= 0)
3291 appendf(&msg, " = %jd bytes", (intmax_t)cnt);
3292 appendf(&msg, " (wd: %s", wd);
3293 if (guest || dochroot)
3294 appendf(&msg, "; chrooted");
3295 appendf(&msg, ")");
3296 syslog(LOG_INFO, "%s", msg);
3297 free(msg);
3298 }
3299
3300 static void
3301 logxfer(char *name, off_t size, time_t start)
3302 {
3303 char buf[MAXPATHLEN + 1024];
3304 char path[MAXPATHLEN + 1];
3305 time_t now;
3306
3307 if (statfd >= 0) {
3308 time(&now);
3309 if (realpath(name, path) == NULL) {
3310 syslog(LOG_NOTICE, "realpath failed on %s: %m", path);
3311 return;
3312 }
3313 snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s!%jd!%ld\n",
3314 ctime(&now)+4, ident, remotehost,
3315 path, (intmax_t)size,
3316 (long)(now - start + (now == start)));
3317 write(statfd, buf, strlen(buf));
3318 }
3319 }
3320
3321 static char *
3322 doublequote(char *s)
3323 {
3324 int n;
3325 char *p, *s2;
3326
3327 for (p = s, n = 0; *p; p++)
3328 if (*p == '"')
3329 n++;
3330
3331 if ((s2 = malloc(p - s + n + 1)) == NULL)
3332 return (NULL);
3333
3334 for (p = s2; *s; s++, p++) {
3335 if ((*p = *s) == '"')
3336 *(++p) = '"';
3337 }
3338 *p = '\0';
3339
3340 return (s2);
3341 }
3342
3343 /* setup server socket for specified address family */
3344 /* if af is PF_UNSPEC more than one socket may be returned */
3345 /* the returned list is dynamically allocated, so caller needs to free it */
3346 static int *
3347 socksetup(int af, char *bindname, const char *bindport)
3348 {
3349 struct addrinfo hints, *res, *r;
3350 int error, maxs, *s, *socks;
3351 const int on = 1;
3352
3353 memset(&hints, 0, sizeof(hints));
3354 hints.ai_flags = AI_PASSIVE;
3355 hints.ai_family = af;
3356 hints.ai_socktype = SOCK_STREAM;
3357 error = getaddrinfo(bindname, bindport, &hints, &res);
3358 if (error) {
3359 syslog(LOG_ERR, "%s", gai_strerror(error));
3360 if (error == EAI_SYSTEM)
3361 syslog(LOG_ERR, "%s", strerror(errno));
3362 return NULL;
3363 }
3364
3365 /* Count max number of sockets we may open */
3366 for (maxs = 0, r = res; r; r = r->ai_next, maxs++)
3367 ;
3368 socks = malloc((maxs + 1) * sizeof(int));
3369 if (!socks) {
3370 freeaddrinfo(res);
3371 syslog(LOG_ERR, "couldn't allocate memory for sockets");
3372 return NULL;
3373 }
3374
3375 *socks = 0; /* num of sockets counter at start of array */
3376 s = socks + 1;
3377 for (r = res; r; r = r->ai_next) {
3378 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol);
3379 if (*s < 0) {
3380 syslog(LOG_DEBUG, "control socket: %m");
3381 continue;
3382 }
3383 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR,
3384 &on, sizeof(on)) < 0)
3385 syslog(LOG_WARNING,
3386 "control setsockopt (SO_REUSEADDR): %m");
3387 if (r->ai_family == AF_INET6) {
3388 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY,
3389 &on, sizeof(on)) < 0)
3390 syslog(LOG_WARNING,
3391 "control setsockopt (IPV6_V6ONLY): %m");
3392 }
3393 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) {
3394 syslog(LOG_DEBUG, "control bind: %m");
3395 close(*s);
3396 continue;
3397 }
3398 (*socks)++;
3399 s++;
3400 }
3401
3402 if (res)
3403 freeaddrinfo(res);
3404
3405 if (*socks == 0) {
3406 syslog(LOG_ERR, "control socket: Couldn't bind to any socket");
3407 free(socks);
3408 return NULL;
3409 }
3410 return(socks);
3411 }
DragonFly BSD