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dhclient - Fix bug last commit
[dragonfly.git] / libexec / ftpd / ftpd.c
blob4aee5e936bc27f7248fcd925471eb4f3fa731bd4
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 /*
184 * Timeout intervals for retrying connections
185 * to hosts that don't accept PORT cmds. This
186 * is a kludge, but given the problems with TCP...
187 */
188 #define SWAITMAX 90 /* wait at most 90 seconds */
189 #define SWAITINT 5 /* interval between retries */
190
191 int swaitmax = SWAITMAX;
192 int swaitint = SWAITINT;
193
194 #ifdef SETPROCTITLE
195 char proctitle[LINE_MAX]; /* initial part of title */
196 #endif /* SETPROCTITLE */
197
198 #define LOGCMD(cmd, file) logcmd((cmd), (file), NULL, -1)
199 #define LOGCMD2(cmd, file1, file2) logcmd((cmd), (file1), (file2), -1)
200 #define LOGBYTES(cmd, file, cnt) logcmd((cmd), (file), NULL, (cnt))
201
202 static volatile sig_atomic_t recvurg;
203 static int transflag; /* NB: for debugging only */
204
205 #define STARTXFER flagxfer(1)
206 #define ENDXFER flagxfer(0)
207
208 #define START_UNSAFE maskurg(1)
209 #define END_UNSAFE maskurg(0)
210
211 /* It's OK to put an `else' clause after this macro. */
212 #define CHECKOOB(action) \
213 if (recvurg) { \
214 recvurg = 0; \
215 if (myoob()) { \
216 ENDXFER; \
217 action; \
218 } \
219 }
220
221 #ifdef VIRTUAL_HOSTING
222 static void inithosts(int);
223 static void selecthost(union sockunion *);
224 #endif
225 static void ack(char *);
226 static void sigurg(int);
227 static void maskurg(int);
228 static void flagxfer(int);
229 static int myoob(void);
230 static int checkuser(char *, char *, int, char **);
231 static FILE *dataconn(char *, off_t, char *);
232 static void dolog(struct sockaddr *);
233 static void end_login(void);
234 static FILE *getdatasock(char *);
235 static int guniquefd(char *, char **);
236 static void lostconn(int);
237 static void sigquit(int);
238 static int receive_data(FILE *, FILE *);
239 static int send_data(FILE *, FILE *, size_t, off_t, int);
240 static struct passwd *
241 sgetpwnam(char *);
242 static char *sgetsave(char *);
243 static void reapchild(int);
244 static void appendf(char **, char *, ...) __printflike(2, 3);
245 static void logcmd(char *, char *, char *, off_t);
246 static void logxfer(char *, off_t, time_t);
247 static char *doublequote(char *);
248 static int *socksetup(int, char *, const char *);
249
250 int
251 main(int argc, char *argv[])
252 {
253 socklen_t addrlen;
254 int ch, on = 1, tos;
255 char *cp, line[LINE_MAX];
256 FILE *fd;
257 char *bindname = NULL;
258 const char *bindport = "ftp";
259 int family = AF_UNSPEC;
260 struct sigaction sa;
261
262 tzset(); /* in case no timezone database in ~ftp */
263 sigemptyset(&sa.sa_mask);
264 sa.sa_flags = SA_RESTART;
265
266 /*
267 * Prevent diagnostic messages from appearing on stderr.
268 * We run as a daemon or from inetd; in both cases, there's
269 * more reason in logging to syslog.
270 */
271 freopen(_PATH_DEVNULL, "w", stderr);
272 opterr = 0;
273
274 /*
275 * LOG_NDELAY sets up the logging connection immediately,
276 * necessary for anonymous ftp's that chroot and can't do it later.
277 */
278 openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP);
279
280 while ((ch = getopt(argc, argv,
281 "468a:AdDEH:hlmMoOp:P:rRSt:T:u:UvW")) != -1) {
282 switch (ch) {
283 case '4':
284 family = (family == AF_INET6) ? AF_UNSPEC : AF_INET;
285 break;
286
287 case '6':
288 family = (family == AF_INET) ? AF_UNSPEC : AF_INET6;
289 break;
290
291 case '8':
292 assumeutf8 = 1;
293 break;
294
295 case 'a':
296 bindname = optarg;
297 break;
298
299 case 'A':
300 anon_only = 1;
301 break;
302
303 case 'd':
304 ftpdebug++;
305 break;
306
307 case 'D':
308 daemon_mode++;
309 break;
310
311 case 'E':
312 noepsv = 1;
313 break;
314
315 case 'h':
316 hostinfo = 0;
317 break;
318
319 case 'H':
320 hostname = optarg;
321 break;
322
323 case 'l':
324 logging++; /* > 1 == extra logging */
325 break;
326
327 case 'm':
328 noguestmod = 0;
329 break;
330
331 case 'M':
332 noguestmkd = 1;
333 break;
334
335 case 'o':
336 noretr = 1;
337 break;
338
339 case 'O':
340 noguestretr = 1;
341 break;
342
343 case 'p':
344 pid_file = optarg;
345 break;
346
347 case 'P':
348 bindport = optarg;
349 break;
350
351 case 'r':
352 readonly = 1;
353 break;
354
355 case 'R':
356 paranoid = 0;
357 break;
358
359 case 'S':
360 stats++;
361 break;
362
363 case 't':
364 timeout = atoi(optarg);
365 if (maxtimeout < timeout)
366 maxtimeout = timeout;
367 break;
368
369 case 'T':
370 maxtimeout = atoi(optarg);
371 if (timeout > maxtimeout)
372 timeout = maxtimeout;
373 break;
374
375 case 'u':
376 {
377 long val = 0;
378
379 val = strtol(optarg, &optarg, 8);
380 if (*optarg != '\0' || val < 0)
381 syslog(LOG_WARNING, "bad value for -u");
382 else
383 defumask = val;
384 break;
385 }
386 case 'U':
387 restricted_data_ports = 0;
388 break;
389
390 case 'v':
391 ftpdebug++;
392 break;
393
394 case 'W':
395 dowtmp = 0;
396 break;
397
398 default:
399 syslog(LOG_WARNING, "unknown flag -%c ignored", optopt);
400 break;
401 }
402 }
403
404 if (daemon_mode) {
405 int *ctl_sock, fd, maxfd = -1, nfds, i;
406 fd_set defreadfds, readfds;
407 pid_t pid;
408 struct pidfh *pfh;
409
410 if ((pfh = pidfile_open(pid_file, 0600, &pid)) == NULL) {
411 if (errno == EEXIST) {
412 syslog(LOG_ERR, "%s already running, pid %d",
413 getprogname(), (int)pid);
414 exit(1);
415 }
416 syslog(LOG_WARNING, "pidfile_open: %m");
417 }
418
419 /*
420 * Detach from parent.
421 */
422 if (daemon(1, 1) < 0) {
423 syslog(LOG_ERR, "failed to become a daemon");
424 exit(1);
425 }
426
427 if (pfh != NULL && pidfile_write(pfh) == -1)
428 syslog(LOG_WARNING, "pidfile_write: %m");
429
430 sa.sa_handler = reapchild;
431 sigaction(SIGCHLD, &sa, NULL);
432
433 #ifdef VIRTUAL_HOSTING
434 inithosts(family);
435 #endif
436
437 /*
438 * Open a socket, bind it to the FTP port, and start
439 * listening.
440 */
441 ctl_sock = socksetup(family, bindname, bindport);
442 if (ctl_sock == NULL)
443 exit(1);
444
445 FD_ZERO(&defreadfds);
446 for (i = 1; i <= *ctl_sock; i++) {
447 FD_SET(ctl_sock[i], &defreadfds);
448 if (listen(ctl_sock[i], 32) < 0) {
449 syslog(LOG_ERR, "control listen: %m");
450 exit(1);
451 }
452 if (maxfd < ctl_sock[i])
453 maxfd = ctl_sock[i];
454 }
455
456 /*
457 * Loop forever accepting connection requests and forking off
458 * children to handle them.
459 */
460 while (1) {
461 FD_COPY(&defreadfds, &readfds);
462 nfds = select(maxfd + 1, &readfds, NULL, NULL, 0);
463 if (nfds <= 0) {
464 if (nfds < 0 && errno != EINTR)
465 syslog(LOG_WARNING, "select: %m");
466 continue;
467 }
468
469 pid = -1;
470 for (i = 1; i <= *ctl_sock; i++)
471 if (FD_ISSET(ctl_sock[i], &readfds)) {
472 addrlen = sizeof(his_addr);
473 fd = accept(ctl_sock[i],
474 (struct sockaddr *)&his_addr,
475 &addrlen);
476 if (fd == -1) {
477 syslog(LOG_WARNING,
478 "accept: %m");
479 continue;
480 }
481 switch (pid = fork()) {
482 case 0:
483 /* child */
484 dup2(fd, 0);
485 dup2(fd, 1);
486 close(fd);
487 for (i = 1; i <= *ctl_sock; i++)
488 close(ctl_sock[i]);
489 if (pfh != NULL)
490 pidfile_close(pfh);
491 goto gotchild;
492 case -1:
493 syslog(LOG_WARNING, "fork: %m");
494 /* FALLTHROUGH */
495 default:
496 close(fd);
497 }
498 }
499 }
500 } else {
501 addrlen = sizeof(his_addr);
502 if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) {
503 syslog(LOG_ERR, "getpeername (%s): %m",argv[0]);
504 exit(1);
505 }
506
507 #ifdef VIRTUAL_HOSTING
508 if (his_addr.su_family == AF_INET6 &&
509 IN6_IS_ADDR_V4MAPPED(&his_addr.su_sin6.sin6_addr))
510 family = AF_INET;
511 else
512 family = his_addr.su_family;
513 inithosts(family);
514 #endif
515 }
516
517 gotchild:
518 sa.sa_handler = SIG_DFL;
519 sigaction(SIGCHLD, &sa, NULL);
520
521 sa.sa_handler = sigurg;
522 sa.sa_flags = 0; /* don't restart syscalls for SIGURG */
523 sigaction(SIGURG, &sa, NULL);
524
525 sigfillset(&sa.sa_mask); /* block all signals in handler */
526 sa.sa_flags = SA_RESTART;
527 sa.sa_handler = sigquit;
528 sigaction(SIGHUP, &sa, NULL);
529 sigaction(SIGINT, &sa, NULL);
530 sigaction(SIGQUIT, &sa, NULL);
531 sigaction(SIGTERM, &sa, NULL);
532
533 sa.sa_handler = lostconn;
534 sigaction(SIGPIPE, &sa, NULL);
535
536 addrlen = sizeof(ctrl_addr);
537 if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) {
538 syslog(LOG_ERR, "getsockname (%s): %m",argv[0]);
539 exit(1);
540 }
541 dataport = ntohs(ctrl_addr.su_port) - 1; /* as per RFC 959 */
542 #ifdef VIRTUAL_HOSTING
543 /* select our identity from virtual host table */
544 selecthost(&ctrl_addr);
545 #endif
546 #ifdef IP_TOS
547 if (ctrl_addr.su_family == AF_INET)
548 {
549 tos = IPTOS_LOWDELAY;
550 if (setsockopt(0, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0)
551 syslog(LOG_WARNING, "control setsockopt (IP_TOS): %m");
552 }
553 #endif
554 /*
555 * Disable Nagle on the control channel so that we don't have to wait
556 * for peer's ACK before issuing our next reply.
557 */
558 if (setsockopt(0, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0)
559 syslog(LOG_WARNING, "control setsockopt (TCP_NODELAY): %m");
560
561 data_source.su_port = htons(ntohs(ctrl_addr.su_port) - 1);
562
563 /* set this here so klogin can use it... */
564 snprintf(ttyline, sizeof(ttyline), "ftp%d", getpid());
565
566 /* Try to handle urgent data inline */
567 #ifdef SO_OOBINLINE
568 if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, &on, sizeof(on)) < 0)
569 syslog(LOG_WARNING, "control setsockopt (SO_OOBINLINE): %m");
570 #endif
571
572 #ifdef F_SETOWN
573 if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1)
574 syslog(LOG_ERR, "fcntl F_SETOWN: %m");
575 #endif
576 dolog((struct sockaddr *)&his_addr);
577 /*
578 * Set up default state
579 */
580 data = -1;
581 type = TYPE_A;
582 form = FORM_N;
583 stru = STRU_F;
584 mode = MODE_S;
585 tmpline[0] = '\0';
586
587 /* If logins are disabled, print out the message. */
588 if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) {
589 while (fgets(line, sizeof(line), fd) != NULL) {
590 if ((cp = strchr(line, '\n')) != NULL)
591 *cp = '\0';
592 lreply(530, "%s", line);
593 }
594 fflush(stdout);
595 fclose(fd);
596 reply(530, "System not available.");
597 exit(0);
598 }
599 #ifdef VIRTUAL_HOSTING
600 fd = fopen(thishost->welcome, "r");
601 #else
602 fd = fopen(_PATH_FTPWELCOME, "r");
603 #endif
604 if (fd != NULL) {
605 while (fgets(line, sizeof(line), fd) != NULL) {
606 if ((cp = strchr(line, '\n')) != NULL)
607 *cp = '\0';
608 lreply(220, "%s", line);
609 }
610 fflush(stdout);
611 fclose(fd);
612 /* reply(220,) must follow */
613 }
614 #ifndef VIRTUAL_HOSTING
615 if (hostname == NULL) {
616 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL)
617 fatalerror("Ran out of memory.");
618 if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0)
619 hostname[0] = '\0';
620 hostname[MAXHOSTNAMELEN - 1] = '\0';
621 }
622 #endif
623 if (hostinfo)
624 reply(220, "%s FTP server (%s) ready.", hostname, version);
625 else
626 reply(220, "FTP server ready.");
627 for (;;)
628 yyparse();
629 /* NOTREACHED */
630 }
631
632 static void
633 lostconn(int signo)
634 {
635
636 if (ftpdebug)
637 syslog(LOG_DEBUG, "lost connection");
638 dologout(1);
639 }
640
641 static void
642 sigquit(int signo)
643 {
644
645 syslog(LOG_ERR, "got signal %d", signo);
646 dologout(1);
647 }
648
649 #ifdef VIRTUAL_HOSTING
650 /*
651 * read in virtual host tables (if they exist)
652 */
653
654 static void
655 inithosts(int family)
656 {
657 int insert;
658 size_t len;
659 FILE *fp;
660 char *cp, *mp, *line;
661 char *vhost, *anonuser, *statfile, *welcome, *loginmsg;
662 struct ftphost *hrp, *lhrp;
663 struct addrinfo hints, *res, *ai;
664
665 /*
666 * Fill in the default host information
667 */
668 if (hostname == NULL) {
669 if ((hostname = malloc(MAXHOSTNAMELEN)) == NULL)
670 fatalerror("Ran out of memory.");
671 if (gethostname(hostname, MAXHOSTNAMELEN - 1) < 0)
672 hostname[0] = '\0';
673 hostname[MAXHOSTNAMELEN - 1] = '\0';
674 }
675 if ((hrp = malloc(sizeof(struct ftphost))) == NULL)
676 fatalerror("Ran out of memory.");
677 hrp->hostname = hostname;
678 hrp->hostinfo = NULL;
679
680 memset(&hints, 0, sizeof(hints));
681 hints.ai_flags = AI_PASSIVE;
682 hints.ai_family = family;
683 hints.ai_socktype = SOCK_STREAM;
684 if (getaddrinfo(hrp->hostname, NULL, &hints, &res) == 0)
685 hrp->hostinfo = res;
686 hrp->statfile = _PATH_FTPDSTATFILE;
687 hrp->welcome = _PATH_FTPWELCOME;
688 hrp->loginmsg = _PATH_FTPLOGINMESG;
689 hrp->anonuser = "ftp";
690 hrp->next = NULL;
691 thishost = firsthost = lhrp = hrp;
692 if ((fp = fopen(_PATH_FTPHOSTS, "r")) != NULL) {
693 int addrsize, gothost;
694 void *addr;
695 struct hostent *hp;
696
697 while ((line = fgetln(fp, &len)) != NULL) {
698 int i, hp_error;
699
700 /* skip comments */
701 if (line[0] == '#')
702 continue;
703 if (line[len - 1] == '\n') {
704 line[len - 1] = '\0';
705 mp = NULL;
706 } else {
707 if ((mp = malloc(len + 1)) == NULL)
708 fatalerror("Ran out of memory.");
709 memcpy(mp, line, len);
710 mp[len] = '\0';
711 line = mp;
712 }
713 cp = strtok(line, " \t");
714 /* skip empty lines */
715 if (cp == NULL)
716 goto nextline;
717 vhost = cp;
718
719 /* set defaults */
720 anonuser = "ftp";
721 statfile = _PATH_FTPDSTATFILE;
722 welcome = _PATH_FTPWELCOME;
723 loginmsg = _PATH_FTPLOGINMESG;
724
725 /*
726 * Preparse the line so we can use its info
727 * for all the addresses associated with
728 * the virtual host name.
729 * Field 0, the virtual host name, is special:
730 * it's already parsed off and will be strdup'ed
731 * later, after we know its canonical form.
732 */
733 for (i = 1; i < 5 && (cp = strtok(NULL, " \t")); i++)
734 if (*cp != '-' && (cp = strdup(cp)))
735 switch (i) {
736 case 1: /* anon user permissions */
737 anonuser = cp;
738 break;
739 case 2: /* statistics file */
740 statfile = cp;
741 break;
742 case 3: /* welcome message */
743 welcome = cp;
744 break;
745 case 4: /* login message */
746 loginmsg = cp;
747 break;
748 default: /* programming error */
749 abort();
750 /* NOTREACHED */
751 }
752
753 hints.ai_flags = AI_PASSIVE;
754 hints.ai_family = family;
755 hints.ai_socktype = SOCK_STREAM;
756 if (getaddrinfo(vhost, NULL, &hints, &res) != 0)
757 goto nextline;
758 for (ai = res; ai != NULL && ai->ai_addr != NULL;
759 ai = ai->ai_next) {
760
761 gothost = 0;
762 for (hrp = firsthost; hrp != NULL; hrp = hrp->next) {
763 struct addrinfo *hi;
764
765 for (hi = hrp->hostinfo; hi != NULL;
766 hi = hi->ai_next)
767 if (hi->ai_addrlen == ai->ai_addrlen &&
768 memcmp(hi->ai_addr,
769 ai->ai_addr,
770 ai->ai_addr->sa_len) == 0) {
771 gothost++;
772 break;
773 }
774 if (gothost)
775 break;
776 }
777 if (hrp == NULL) {
778 if ((hrp = malloc(sizeof(struct ftphost))) == NULL)
779 goto nextline;
780 hrp->hostname = NULL;
781 insert = 1;
782 } else {
783 if (hrp->hostinfo && hrp->hostinfo != res)
784 freeaddrinfo(hrp->hostinfo);
785 insert = 0; /* host already in the chain */
786 }
787 hrp->hostinfo = res;
788
789 /*
790 * determine hostname to use.
791 * force defined name if there is a valid alias
792 * otherwise fallback to primary hostname
793 */
794 /* XXX: getaddrinfo() can't do alias check */
795 switch(hrp->hostinfo->ai_family) {
796 case AF_INET:
797 addr = &((struct sockaddr_in *)hrp->hostinfo->ai_addr)->sin_addr;
798 addrsize = sizeof(struct in_addr);
799 break;
800 case AF_INET6:
801 addr = &((struct sockaddr_in6 *)hrp->hostinfo->ai_addr)->sin6_addr;
802 addrsize = sizeof(struct in6_addr);
803 break;
804 default:
805 /* should not reach here */
806 freeaddrinfo(hrp->hostinfo);
807 if (insert)
808 free(hrp); /*not in chain, can free*/
809 else
810 hrp->hostinfo = NULL; /*mark as blank*/
811 goto nextline;
812 /* NOTREACHED */
813 }
814 if ((hp = getipnodebyaddr(addr, addrsize,
815 hrp->hostinfo->ai_family,
816 &hp_error)) != NULL) {
817 if (strcmp(vhost, hp->h_name) != 0) {
818 if (hp->h_aliases == NULL)
819 vhost = hp->h_name;
820 else {
821 i = 0;
822 while (hp->h_aliases[i] &&
823 strcmp(vhost, hp->h_aliases[i]) != 0)
824 ++i;
825 if (hp->h_aliases[i] == NULL)
826 vhost = hp->h_name;
827 }
828 }
829 }
830 if (hrp->hostname &&
831 strcmp(hrp->hostname, vhost) != 0) {
832 free(hrp->hostname);
833 hrp->hostname = NULL;
834 }
835 if (hrp->hostname == NULL &&
836 (hrp->hostname = strdup(vhost)) == NULL) {
837 freeaddrinfo(hrp->hostinfo);
838 hrp->hostinfo = NULL; /* mark as blank */
839 if (hp)
840 freehostent(hp);
841 goto nextline;
842 }
843 hrp->anonuser = anonuser;
844 hrp->statfile = statfile;
845 hrp->welcome = welcome;
846 hrp->loginmsg = loginmsg;
847 if (insert) {
848 hrp->next = NULL;
849 lhrp->next = hrp;
850 lhrp = hrp;
851 }
852 if (hp)
853 freehostent(hp);
854 }
855 nextline:
856 if (mp)
857 free(mp);
858 }
859 fclose(fp);
860 }
861 }
862
863 static void
864 selecthost(union sockunion *su)
865 {
866 struct ftphost *hrp;
867 u_int16_t port;
868 #ifdef INET6
869 struct in6_addr *mapped_in6 = NULL;
870 #endif
871 struct addrinfo *hi;
872
873 #ifdef INET6
874 /*
875 * XXX IPv4 mapped IPv6 addr consideraton,
876 * specified in rfc2373.
877 */
878 if (su->su_family == AF_INET6 &&
879 IN6_IS_ADDR_V4MAPPED(&su->su_sin6.sin6_addr))
880 mapped_in6 = &su->su_sin6.sin6_addr;
881 #endif
882
883 hrp = thishost = firsthost; /* default */
884 port = su->su_port;
885 su->su_port = 0;
886 while (hrp != NULL) {
887 for (hi = hrp->hostinfo; hi != NULL; hi = hi->ai_next) {
888 if (memcmp(su, hi->ai_addr, hi->ai_addrlen) == 0) {
889 thishost = hrp;
890 goto found;
891 }
892 #ifdef INET6
893 /* XXX IPv4 mapped IPv6 addr consideraton */
894 if (hi->ai_addr->sa_family == AF_INET && mapped_in6 != NULL &&
895 (memcmp(&mapped_in6->s6_addr[12],
896 &((struct sockaddr_in *)hi->ai_addr)->sin_addr,
897 sizeof(struct in_addr)) == 0)) {
898 thishost = hrp;
899 goto found;
900 }
901 #endif
902 }
903 hrp = hrp->next;
904 }
905 found:
906 su->su_port = port;
907 /* setup static variables as appropriate */
908 hostname = thishost->hostname;
909 ftpuser = thishost->anonuser;
910 }
911 #endif
912
913 /*
914 * Helper function for sgetpwnam().
915 */
916 static char *
917 sgetsave(char *s)
918 {
919 char *new = malloc(strlen(s) + 1);
920
921 if (new == NULL) {
922 reply(421, "Ran out of memory.");
923 dologout(1);
924 /* NOTREACHED */
925 }
926 strcpy(new, s);
927 return (new);
928 }
929
930 /*
931 * Save the result of a getpwnam. Used for USER command, since
932 * the data returned must not be clobbered by any other command
933 * (e.g., globbing).
934 * NB: The data returned by sgetpwnam() will remain valid until
935 * the next call to this function. Its difference from getpwnam()
936 * is that sgetpwnam() is known to be called from ftpd code only.
937 */
938 static struct passwd *
939 sgetpwnam(char *name)
940 {
941 static struct passwd save;
942 struct passwd *p;
943
944 if ((p = getpwnam(name)) == NULL)
945 return (p);
946 if (save.pw_name) {
947 free(save.pw_name);
948 free(save.pw_passwd);
949 free(save.pw_gecos);
950 free(save.pw_dir);
951 free(save.pw_shell);
952 }
953 save = *p;
954 save.pw_name = sgetsave(p->pw_name);
955 save.pw_passwd = sgetsave(p->pw_passwd);
956 save.pw_gecos = sgetsave(p->pw_gecos);
957 save.pw_dir = sgetsave(p->pw_dir);
958 save.pw_shell = sgetsave(p->pw_shell);
959 return (&save);
960 }
961
962 static int login_attempts; /* number of failed login attempts */
963 static int askpasswd; /* had user command, ask for passwd */
964 static char curname[MAXLOGNAME]; /* current USER name */
965
966 /*
967 * USER command.
968 * Sets global passwd pointer pw if named account exists and is acceptable;
969 * sets askpasswd if a PASS command is expected. If logged in previously,
970 * need to reset state. If name is "ftp" or "anonymous", the name is not in
971 * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return.
972 * If account doesn't exist, ask for passwd anyway. Otherwise, check user
973 * requesting login privileges. Disallow anyone who does not have a standard
974 * shell as returned by getusershell(). Disallow anyone mentioned in the file
975 * _PATH_FTPUSERS to allow people such as root and uucp to be avoided.
976 */
977 void
978 user(char *name)
979 {
980 char *cp, *shell;
981
982 if (logged_in) {
983 if (guest) {
984 reply(530, "Can't change user from guest login.");
985 return;
986 } else if (dochroot) {
987 reply(530, "Can't change user from chroot user.");
988 return;
989 }
990 end_login();
991 }
992
993 guest = 0;
994 #ifdef VIRTUAL_HOSTING
995 pw = sgetpwnam(thishost->anonuser);
996 #else
997 pw = sgetpwnam("ftp");
998 #endif
999 if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) {
1000 if (checkuser(_PATH_FTPUSERS, "ftp", 0, NULL) ||
1001 checkuser(_PATH_FTPUSERS, "anonymous", 0, NULL))
1002 reply(530, "User %s access denied.", name);
1003 else if (pw != NULL) {
1004 guest = 1;
1005 askpasswd = 1;
1006 reply(331,
1007 "Guest login ok, send your email address as password.");
1008 } else
1009 reply(530, "User %s unknown.", name);
1010 if (!askpasswd && logging)
1011 syslog(LOG_NOTICE,
1012 "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost);
1013 return;
1014 }
1015 if (anon_only != 0) {
1016 reply(530, "Sorry, only anonymous ftp allowed.");
1017 return;
1018 }
1019
1020 if ((pw = sgetpwnam(name))) {
1021 if ((shell = pw->pw_shell) == NULL || *shell == 0)
1022 shell = _PATH_BSHELL;
1023 setusershell();
1024 while ((cp = getusershell()) != NULL)
1025 if (strcmp(cp, shell) == 0)
1026 break;
1027 endusershell();
1028
1029 if (cp == NULL || checkuser(_PATH_FTPUSERS, name, 1, NULL)) {
1030 reply(530, "User %s access denied.", name);
1031 if (logging)
1032 syslog(LOG_NOTICE,
1033 "FTP LOGIN REFUSED FROM %s, %s",
1034 remotehost, name);
1035 pw = NULL;
1036 return;
1037 }
1038 }
1039 if (logging)
1040 strncpy(curname, name, sizeof(curname)-1);
1041
1042 pwok = 0;
1043 #ifdef USE_PAM
1044 /* XXX Kluge! The conversation mechanism needs to be fixed. */
1045 #endif
1046 if (opiechallenge(&opiedata, name, opieprompt) == 0) {
1047 pwok = (pw != NULL) &&
1048 opieaccessfile(remotehost) &&
1049 opiealways(pw->pw_dir);
1050 reply(331, "Response to %s %s for %s.",
1051 opieprompt, pwok ? "requested" : "required", name);
1052 } else {
1053 pwok = 1;
1054 reply(331, "Password required for %s.", name);
1055 }
1056 askpasswd = 1;
1057 /*
1058 * Delay before reading passwd after first failed
1059 * attempt to slow down passwd-guessing programs.
1060 */
1061 if (login_attempts)
1062 sleep(login_attempts);
1063 }
1064
1065 /*
1066 * Check if a user is in the file "fname",
1067 * return a pointer to a malloc'd string with the rest
1068 * of the matching line in "residue" if not NULL.
1069 */
1070 static int
1071 checkuser(char *fname, char *name, int pwset, char **residue)
1072 {
1073 FILE *fd;
1074 int found = 0;
1075 size_t len;
1076 char *line, *mp, *p;
1077
1078 if ((fd = fopen(fname, "r")) != NULL) {
1079 while (!found && (line = fgetln(fd, &len)) != NULL) {
1080 /* skip comments */
1081 if (line[0] == '#')
1082 continue;
1083 if (line[len - 1] == '\n') {
1084 line[len - 1] = '\0';
1085 mp = NULL;
1086 } else {
1087 if ((mp = malloc(len + 1)) == NULL)
1088 fatalerror("Ran out of memory.");
1089 memcpy(mp, line, len);
1090 mp[len] = '\0';
1091 line = mp;
1092 }
1093 /* avoid possible leading and trailing whitespace */
1094 p = strtok(line, " \t");
1095 /* skip empty lines */
1096 if (p == NULL)
1097 goto nextline;
1098 /*
1099 * if first chr is '@', check group membership
1100 */
1101 if (p[0] == '@') {
1102 int i = 0;
1103 struct group *grp;
1104
1105 if (p[1] == '\0') /* single @ matches anyone */
1106 found = 1;
1107 else {
1108 if ((grp = getgrnam(p+1)) == NULL)
1109 goto nextline;
1110 /*
1111 * Check user's default group
1112 */
1113 if (pwset && grp->gr_gid == pw->pw_gid)
1114 found = 1;
1115 /*
1116 * Check supplementary groups
1117 */
1118 while (!found && grp->gr_mem[i])
1119 found = strcmp(name,
1120 grp->gr_mem[i++])
1121 == 0;
1122 }
1123 }
1124 /*
1125 * Otherwise, just check for username match
1126 */
1127 else
1128 found = strcmp(p, name) == 0;
1129 /*
1130 * Save the rest of line to "residue" if matched
1131 */
1132 if (found && residue) {
1133 if ((p = strtok(NULL, "")) != NULL)
1134 p += strspn(p, " \t");
1135 if (p && *p) {
1136 if ((*residue = strdup(p)) == NULL)
1137 fatalerror("Ran out of memory.");
1138 } else
1139 *residue = NULL;
1140 }
1141 nextline:
1142 if (mp)
1143 free(mp);
1144 }
1145 fclose(fd);
1146 }
1147 return (found);
1148 }
1149
1150 /*
1151 * Terminate login as previous user, if any, resetting state;
1152 * used when USER command is given or login fails.
1153 */
1154 static void
1155 end_login(void)
1156 {
1157 #ifdef USE_PAM
1158 int e;
1159 #endif
1160
1161 seteuid(0);
1162 if (logged_in && dowtmp)
1163 ftpd_logwtmp(ttyline, "", NULL);
1164 pw = NULL;
1165 #ifdef LOGIN_CAP
1166 /* XXX Missing LOGIN_SETMAC */
1167 setusercontext(NULL, getpwuid(0), 0,
1168 LOGIN_SETPRIORITY|LOGIN_SETRESOURCES|LOGIN_SETUMASK);
1169 #endif
1170 #ifdef USE_PAM
1171 if (pamh) {
1172 if ((e = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS)
1173 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e));
1174 if ((e = pam_close_session(pamh,0)) != PAM_SUCCESS)
1175 syslog(LOG_ERR, "pam_close_session: %s", pam_strerror(pamh, e));
1176 if ((e = pam_end(pamh, e)) != PAM_SUCCESS)
1177 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e));
1178 pamh = NULL;
1179 }
1180 #endif
1181 logged_in = 0;
1182 guest = 0;
1183 dochroot = 0;
1184 }
1185
1186 #ifdef USE_PAM
1187
1188 /*
1189 * the following code is stolen from imap-uw PAM authentication module and
1190 * login.c
1191 */
1192 #define COPY_STRING(s) (s ? strdup(s) : NULL)
1193
1194 struct cred_t {
1195 const char *uname; /* user name */
1196 const char *pass; /* password */
1197 };
1198 typedef struct cred_t cred_t;
1199
1200 static int
1201 auth_conv(int num_msg, const struct pam_message **msg,
1202 struct pam_response **resp, void *appdata)
1203 {
1204 int i;
1205 cred_t *cred = (cred_t *) appdata;
1206 struct pam_response *reply;
1207
1208 reply = calloc(num_msg, sizeof *reply);
1209 if (reply == NULL)
1210 return PAM_BUF_ERR;
1211
1212 for (i = 0; i < num_msg; i++) {
1213 switch (msg[i]->msg_style) {
1214 case PAM_PROMPT_ECHO_ON: /* assume want user name */
1215 reply[i].resp_retcode = PAM_SUCCESS;
1216 reply[i].resp = COPY_STRING(cred->uname);
1217 /* PAM frees resp. */
1218 break;
1219 case PAM_PROMPT_ECHO_OFF: /* assume want password */
1220 reply[i].resp_retcode = PAM_SUCCESS;
1221 reply[i].resp = COPY_STRING(cred->pass);
1222 /* PAM frees resp. */
1223 break;
1224 case PAM_TEXT_INFO:
1225 case PAM_ERROR_MSG:
1226 reply[i].resp_retcode = PAM_SUCCESS;
1227 reply[i].resp = NULL;
1228 break;
1229 default: /* unknown message style */
1230 free(reply);
1231 return PAM_CONV_ERR;
1232 }
1233 }
1234
1235 *resp = reply;
1236 return PAM_SUCCESS;
1237 }
1238
1239 /*
1240 * Attempt to authenticate the user using PAM. Returns 0 if the user is
1241 * authenticated, or 1 if not authenticated. If some sort of PAM system
1242 * error occurs (e.g., the "/etc/pam.conf" file is missing) then this
1243 * function returns -1. This can be used as an indication that we should
1244 * fall back to a different authentication mechanism.
1245 */
1246 static int
1247 auth_pam(struct passwd **ppw, const char *pass)
1248 {
1249 const char *tmpl_user;
1250 const void *item;
1251 int rval;
1252 int e;
1253 cred_t auth_cred = { (*ppw)->pw_name, pass };
1254 struct pam_conv conv = { &auth_conv, &auth_cred };
1255
1256 e = pam_start("ftpd", (*ppw)->pw_name, &conv, &pamh);
1257 if (e != PAM_SUCCESS) {
1258 /*
1259 * In OpenPAM, it's OK to pass NULL to pam_strerror()
1260 * if context creation has failed in the first place.
1261 */
1262 syslog(LOG_ERR, "pam_start: %s", pam_strerror(NULL, e));
1263 return -1;
1264 }
1265
1266 e = pam_set_item(pamh, PAM_RHOST, remotehost);
1267 if (e != PAM_SUCCESS) {
1268 syslog(LOG_ERR, "pam_set_item(PAM_RHOST): %s",
1269 pam_strerror(pamh, e));
1270 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) {
1271 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e));
1272 }
1273 pamh = NULL;
1274 return -1;
1275 }
1276
1277 e = pam_authenticate(pamh, 0);
1278 switch (e) {
1279 case PAM_SUCCESS:
1280 /*
1281 * With PAM we support the concept of a "template"
1282 * user. The user enters a login name which is
1283 * authenticated by PAM, usually via a remote service
1284 * such as RADIUS or TACACS+. If authentication
1285 * succeeds, a different but related "template" name
1286 * is used for setting the credentials, shell, and
1287 * home directory. The name the user enters need only
1288 * exist on the remote authentication server, but the
1289 * template name must be present in the local password
1290 * database.
1291 *
1292 * This is supported by two various mechanisms in the
1293 * individual modules. However, from the application's
1294 * point of view, the template user is always passed
1295 * back as a changed value of the PAM_USER item.
1296 */
1297 if ((e = pam_get_item(pamh, PAM_USER, &item)) ==
1298 PAM_SUCCESS) {
1299 tmpl_user = (const char *) item;
1300 if (strcmp((*ppw)->pw_name, tmpl_user) != 0)
1301 *ppw = getpwnam(tmpl_user);
1302 } else
1303 syslog(LOG_ERR, "Couldn't get PAM_USER: %s",
1304 pam_strerror(pamh, e));
1305 rval = 0;
1306 break;
1307
1308 case PAM_AUTH_ERR:
1309 case PAM_USER_UNKNOWN:
1310 case PAM_MAXTRIES:
1311 rval = 1;
1312 break;
1313
1314 default:
1315 syslog(LOG_ERR, "pam_authenticate: %s", pam_strerror(pamh, e));
1316 rval = -1;
1317 break;
1318 }
1319
1320 if (rval == 0) {
1321 e = pam_acct_mgmt(pamh, 0);
1322 if (e != PAM_SUCCESS) {
1323 syslog(LOG_ERR, "pam_acct_mgmt: %s",
1324 pam_strerror(pamh, e));
1325 rval = 1;
1326 }
1327 }
1328
1329 if (rval != 0) {
1330 if ((e = pam_end(pamh, e)) != PAM_SUCCESS) {
1331 syslog(LOG_ERR, "pam_end: %s", pam_strerror(pamh, e));
1332 }
1333 pamh = NULL;
1334 }
1335 return rval;
1336 }
1337
1338 #endif /* USE_PAM */
1339
1340 void
1341 pass(char *passwd)
1342 {
1343 int rval;
1344 FILE *fd;
1345 #ifdef LOGIN_CAP
1346 login_cap_t *lc = NULL;
1347 #endif
1348 #ifdef USE_PAM
1349 int e;
1350 #endif
1351 char *residue = NULL;
1352 char *xpasswd;
1353
1354 if (logged_in || askpasswd == 0) {
1355 reply(503, "Login with USER first.");
1356 return;
1357 }
1358 askpasswd = 0;
1359 if (!guest) { /* "ftp" is only account allowed no password */
1360 if (pw == NULL) {
1361 rval = 1; /* failure below */
1362 goto skip;
1363 }
1364 #ifdef USE_PAM
1365 rval = auth_pam(&pw, passwd);
1366 if (rval >= 0) {
1367 opieunlock();
1368 goto skip;
1369 }
1370 #endif
1371 if (opieverify(&opiedata, passwd) == 0)
1372 xpasswd = pw->pw_passwd;
1373 else if (pwok) {
1374 xpasswd = crypt(passwd, pw->pw_passwd);
1375 if (passwd[0] == '\0' && pw->pw_passwd[0] != '\0')
1376 xpasswd = ":";
1377 } else {
1378 rval = 1;
1379 goto skip;
1380 }
1381 rval = strcmp(pw->pw_passwd, xpasswd);
1382 if (pw->pw_expire && time(NULL) >= pw->pw_expire)
1383 rval = 1; /* failure */
1384 skip:
1385 /*
1386 * If rval == 1, the user failed the authentication check
1387 * above. If rval == 0, either PAM or local authentication
1388 * succeeded.
1389 */
1390 if (rval) {
1391 reply(530, "Login incorrect.");
1392 if (logging) {
1393 syslog(LOG_NOTICE,
1394 "FTP LOGIN FAILED FROM %s",
1395 remotehost);
1396 syslog(LOG_AUTHPRIV | LOG_NOTICE,
1397 "FTP LOGIN FAILED FROM %s, %s",
1398 remotehost, curname);
1399 }
1400 pw = NULL;
1401 if (login_attempts++ >= 5) {
1402 syslog(LOG_NOTICE,
1403 "repeated login failures from %s",
1404 remotehost);
1405 exit(0);
1406 }
1407 return;
1408 }
1409 }
1410 login_attempts = 0; /* this time successful */
1411 if (setegid(pw->pw_gid) < 0) {
1412 reply(550, "Can't set gid.");
1413 return;
1414 }
1415 /* May be overridden by login.conf */
1416 umask(defumask);
1417 #ifdef LOGIN_CAP
1418 if ((lc = login_getpwclass(pw)) != NULL) {
1419 char remote_ip[NI_MAXHOST];
1420
1421 if (getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len,
1422 remote_ip, sizeof(remote_ip) - 1, NULL, 0,
1423 NI_NUMERICHOST))
1424 *remote_ip = 0;
1425 remote_ip[sizeof(remote_ip) - 1] = 0;
1426 if (!auth_hostok(lc, remotehost, remote_ip)) {
1427 syslog(LOG_INFO|LOG_AUTH,
1428 "FTP LOGIN FAILED (HOST) as %s: permission denied.",
1429 pw->pw_name);
1430 reply(530, "Permission denied.");
1431 pw = NULL;
1432 return;
1433 }
1434 if (!auth_timeok(lc, time(NULL))) {
1435 reply(530, "Login not available right now.");
1436 pw = NULL;
1437 return;
1438 }
1439 }
1440 /* XXX Missing LOGIN_SETMAC */
1441 setusercontext(lc, pw, 0,
1442 LOGIN_SETLOGIN|LOGIN_SETGROUP|LOGIN_SETPRIORITY|
1443 LOGIN_SETRESOURCES|LOGIN_SETUMASK);
1444 #else
1445 setlogin(pw->pw_name);
1446 initgroups(pw->pw_name, pw->pw_gid);
1447 #endif
1448
1449 #ifdef USE_PAM
1450 if (pamh) {
1451 if ((e = pam_open_session(pamh, 0)) != PAM_SUCCESS) {
1452 syslog(LOG_ERR, "pam_open_session: %s", pam_strerror(pamh, e));
1453 } else if ((e = pam_setcred(pamh, PAM_ESTABLISH_CRED)) != PAM_SUCCESS) {
1454 syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, e));
1455 }
1456 }
1457 #endif
1458
1459 /* open wtmp before chroot */
1460 if (dowtmp)
1461 ftpd_logwtmp(ttyline, pw->pw_name,
1462 (struct sockaddr *)&his_addr);
1463 logged_in = 1;
1464
1465 if (guest && stats && statfd < 0)
1466 #ifdef VIRTUAL_HOSTING
1467 statfd = open(thishost->statfile, O_WRONLY|O_APPEND);
1468 #else
1469 statfd = open(_PATH_FTPDSTATFILE, O_WRONLY|O_APPEND);
1470 #endif
1471 if (statfd < 0)
1472 stats = 0;
1473
1474 dochroot =
1475 checkuser(_PATH_FTPCHROOT, pw->pw_name, 1, &residue)
1476 #ifdef LOGIN_CAP /* Allow login.conf configuration as well */
1477 || login_getcapbool(lc, "ftp-chroot", 0)
1478 #endif
1479 ;
1480 chrootdir = NULL;
1481 /*
1482 * For a chrooted local user,
1483 * a) see whether ftpchroot(5) specifies a chroot directory,
1484 * b) extract the directory pathname from the line,
1485 * c) expand it to the absolute pathname if necessary.
1486 */
1487 if (dochroot && residue &&
1488 (chrootdir = strtok(residue, " \t")) != NULL) {
1489 if (chrootdir[0] != '/')
1490 asprintf(&chrootdir, "%s/%s", pw->pw_dir, chrootdir);
1491 else
1492 chrootdir = strdup(chrootdir); /* make it permanent */
1493 if (chrootdir == NULL)
1494 fatalerror("Ran out of memory.");
1495 }
1496 if (guest || dochroot) {
1497 /*
1498 * If no chroot directory set yet, use the login directory.
1499 * Copy it so it can be modified while pw->pw_dir stays intact.
1500 */
1501 if (chrootdir == NULL &&
1502 (chrootdir = strdup(pw->pw_dir)) == NULL)
1503 fatalerror("Ran out of memory.");
1504 /*
1505 * Check for the "/chroot/./home" syntax,
1506 * separate the chroot and home directory pathnames.
1507 */
1508 if ((homedir = strstr(chrootdir, "/./")) != NULL) {
1509 *(homedir++) = '\0'; /* wipe '/' */
1510 homedir++; /* skip '.' */
1511 } else {
1512 /*
1513 * We MUST do a chdir() after the chroot. Otherwise
1514 * the old current directory will be accessible as "."
1515 * outside the new root!
1516 */
1517 homedir = "/";
1518 }
1519 /*
1520 * Finally, do chroot()
1521 */
1522 if (chroot(chrootdir) < 0) {
1523 reply(550, "Can't change root.");
1524 goto bad;
1525 }
1526 } else /* real user w/o chroot */
1527 homedir = pw->pw_dir;
1528 /*
1529 * Set euid *before* doing chdir() so
1530 * a) the user won't be carried to a directory that he couldn't reach
1531 * on his own due to no permission to upper path components,
1532 * b) NFS mounted homedirs w/restrictive permissions will be accessible
1533 * (uid 0 has no root power over NFS if not mapped explicitly.)
1534 */
1535 if (seteuid(pw->pw_uid) < 0) {
1536 reply(550, "Can't set uid.");
1537 goto bad;
1538 }
1539 if (chdir(homedir) < 0) {
1540 if (guest || dochroot) {
1541 reply(550, "Can't change to base directory.");
1542 goto bad;
1543 } else {
1544 if (chdir("/") < 0) {
1545 reply(550, "Root is inaccessible.");
1546 goto bad;
1547 }
1548 lreply(230, "No directory! Logging in with home=/.");
1549 }
1550 }
1551
1552 /*
1553 * Display a login message, if it exists.
1554 * N.B. reply(230,) must follow the message.
1555 */
1556 #ifdef VIRTUAL_HOSTING
1557 fd = fopen(thishost->loginmsg, "r");
1558 #else
1559 fd = fopen(_PATH_FTPLOGINMESG, "r");
1560 #endif
1561 if (fd != NULL) {
1562 char *cp, line[LINE_MAX];
1563
1564 while (fgets(line, sizeof(line), fd) != NULL) {
1565 if ((cp = strchr(line, '\n')) != NULL)
1566 *cp = '\0';
1567 lreply(230, "%s", line);
1568 }
1569 fflush(stdout);
1570 fclose(fd);
1571 }
1572 if (guest) {
1573 if (ident != NULL)
1574 free(ident);
1575 ident = strdup(passwd);
1576 if (ident == NULL)
1577 fatalerror("Ran out of memory.");
1578
1579 reply(230, "Guest login ok, access restrictions apply.");
1580 #ifdef SETPROCTITLE
1581 #ifdef VIRTUAL_HOSTING
1582 if (thishost != firsthost)
1583 snprintf(proctitle, sizeof(proctitle),
1584 "%s: anonymous(%s)/%s", remotehost, hostname,
1585 passwd);
1586 else
1587 #endif
1588 snprintf(proctitle, sizeof(proctitle),
1589 "%s: anonymous/%s", remotehost, passwd);
1590 setproctitle("%s", proctitle);
1591 #endif /* SETPROCTITLE */
1592 if (logging)
1593 syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s",
1594 remotehost, passwd);
1595 } else {
1596 if (dochroot)
1597 reply(230, "User %s logged in, "
1598 "access restrictions apply.", pw->pw_name);
1599 else
1600 reply(230, "User %s logged in.", pw->pw_name);
1601
1602 #ifdef SETPROCTITLE
1603 snprintf(proctitle, sizeof(proctitle),
1604 "%s: user/%s", remotehost, pw->pw_name);
1605 setproctitle("%s", proctitle);
1606 #endif /* SETPROCTITLE */
1607 if (logging)
1608 syslog(LOG_INFO, "FTP LOGIN FROM %s as %s",
1609 remotehost, pw->pw_name);
1610 }
1611 if (logging && (guest || dochroot))
1612 syslog(LOG_INFO, "session root changed to %s", chrootdir);
1613 #ifdef LOGIN_CAP
1614 login_close(lc);
1615 #endif
1616 if (residue)
1617 free(residue);
1618 return;
1619 bad:
1620 /* Forget all about it... */
1621 #ifdef LOGIN_CAP
1622 login_close(lc);
1623 #endif
1624 if (residue)
1625 free(residue);
1626 end_login();
1627 }
1628
1629 void
1630 retrieve(char *cmd, char *name)
1631 {
1632 FILE *fin, *dout;
1633 struct stat st;
1634 int (*closefunc)(FILE *);
1635 time_t start;
1636
1637 if (cmd == NULL) {
1638 fin = fopen(name, "r"), closefunc = fclose;
1639 st.st_size = 0;
1640 } else {
1641 char line[BUFSIZ];
1642
1643 snprintf(line, sizeof(line), cmd, name), name = line;
1644 fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose;
1645 st.st_size = -1;
1646 st.st_blksize = BUFSIZ;
1647 }
1648 if (fin == NULL) {
1649 if (errno != 0) {
1650 perror_reply(550, name);
1651 if (cmd == NULL) {
1652 LOGCMD("get", name);
1653 }
1654 }
1655 return;
1656 }
1657 byte_count = -1;
1658 if (cmd == NULL) {
1659 if (fstat(fileno(fin), &st) < 0) {
1660 perror_reply(550, name);
1661 goto done;
1662 }
1663 if (!S_ISREG(st.st_mode)) {
1664 /*
1665 * Never sending a raw directory is a workaround
1666 * for buggy clients that will attempt to RETR
1667 * a directory before listing it, e.g., Mozilla.
1668 * Preventing a guest from getting irregular files
1669 * is a simple security measure.
1670 */
1671 if (S_ISDIR(st.st_mode) || guest) {
1672 reply(550, "%s: not a plain file.", name);
1673 goto done;
1674 }
1675 st.st_size = -1;
1676 /* st.st_blksize is set for all descriptor types */
1677 }
1678 }
1679 if (restart_point) {
1680 if (type == TYPE_A) {
1681 off_t i, n;
1682 int c;
1683
1684 n = restart_point;
1685 i = 0;
1686 while (i++ < n) {
1687 if ((c=getc(fin)) == EOF) {
1688 perror_reply(550, name);
1689 goto done;
1690 }
1691 if (c == '\n')
1692 i++;
1693 }
1694 } else if (lseek(fileno(fin), restart_point, L_SET) < 0) {
1695 perror_reply(550, name);
1696 goto done;
1697 }
1698 }
1699 dout = dataconn(name, st.st_size, "w");
1700 if (dout == NULL)
1701 goto done;
1702 time(&start);
1703 send_data(fin, dout, st.st_blksize, st.st_size,
1704 restart_point == 0 && cmd == NULL && S_ISREG(st.st_mode));
1705 if (cmd == NULL && guest && stats && byte_count > 0)
1706 logxfer(name, byte_count, start);
1707 fclose(dout);
1708 data = -1;
1709 pdata = -1;
1710 done:
1711 if (cmd == NULL)
1712 LOGBYTES("get", name, byte_count);
1713 (*closefunc)(fin);
1714 }
1715
1716 void
1717 store(char *name, char *mode, int unique)
1718 {
1719 int fd;
1720 FILE *fout, *din;
1721 int (*closefunc)(FILE *);
1722
1723 if (*mode == 'a') { /* APPE */
1724 if (unique) {
1725 /* Programming error */
1726 syslog(LOG_ERR, "Internal: unique flag to APPE");
1727 unique = 0;
1728 }
1729 if (guest && noguestmod) {
1730 reply(550, "Appending to existing file denied.");
1731 goto err;
1732 }
1733 restart_point = 0; /* not affected by preceding REST */
1734 }
1735 if (unique) /* STOU overrides REST */
1736 restart_point = 0;
1737 if (guest && noguestmod) {
1738 if (restart_point) { /* guest STOR w/REST */
1739 reply(550, "Modifying existing file denied.");
1740 goto err;
1741 } else /* treat guest STOR as STOU */
1742 unique = 1;
1743 }
1744
1745 if (restart_point)
1746 mode = "r+"; /* so ASCII manual seek can work */
1747 if (unique) {
1748 if ((fd = guniquefd(name, &name)) < 0)
1749 goto err;
1750 fout = fdopen(fd, mode);
1751 } else
1752 fout = fopen(name, mode);
1753 closefunc = fclose;
1754 if (fout == NULL) {
1755 perror_reply(553, name);
1756 goto err;
1757 }
1758 byte_count = -1;
1759 if (restart_point) {
1760 if (type == TYPE_A) {
1761 off_t i, n;
1762 int c;
1763
1764 n = restart_point;
1765 i = 0;
1766 while (i++ < n) {
1767 if ((c=getc(fout)) == EOF) {
1768 perror_reply(550, name);
1769 goto done;
1770 }
1771 if (c == '\n')
1772 i++;
1773 }
1774 /*
1775 * We must do this seek to "current" position
1776 * because we are changing from reading to
1777 * writing.
1778 */
1779 if (fseeko(fout, 0, SEEK_CUR) < 0) {
1780 perror_reply(550, name);
1781 goto done;
1782 }
1783 } else if (lseek(fileno(fout), restart_point, L_SET) < 0) {
1784 perror_reply(550, name);
1785 goto done;
1786 }
1787 }
1788 din = dataconn(name, -1, "r");
1789 if (din == NULL)
1790 goto done;
1791 if (receive_data(din, fout) == 0) {
1792 if (unique)
1793 reply(226, "Transfer complete (unique file name:%s).",
1794 name);
1795 else
1796 reply(226, "Transfer complete.");
1797 }
1798 fclose(din);
1799 data = -1;
1800 pdata = -1;
1801 done:
1802 LOGBYTES(*mode == 'a' ? "append" : "put", name, byte_count);
1803 (*closefunc)(fout);
1804 return;
1805 err:
1806 LOGCMD(*mode == 'a' ? "append" : "put" , name);
1807 return;
1808 }
1809
1810 static FILE *
1811 getdatasock(char *mode)
1812 {
1813 int on = 1, s, t, tries;
1814
1815 if (data >= 0)
1816 return (fdopen(data, mode));
1817
1818 s = socket(data_dest.su_family, SOCK_STREAM, 0);
1819 if (s < 0)
1820 goto bad;
1821 if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
1822 syslog(LOG_WARNING, "data setsockopt (SO_REUSEADDR): %m");
1823 /* anchor socket to avoid multi-homing problems */
1824 data_source = ctrl_addr;
1825 data_source.su_port = htons(dataport);
1826 seteuid(0);
1827 for (tries = 1; ; tries++) {
1828 /*
1829 * We should loop here since it's possible that
1830 * another ftpd instance has passed this point and is
1831 * trying to open a data connection in active mode now.
1832 * Until the other connection is opened, we'll be getting
1833 * EADDRINUSE because no SOCK_STREAM sockets in the system
1834 * can share both local and remote addresses, localIP:20
1835 * and *:* in this case.
1836 */
1837 if (bind(s, (struct sockaddr *)&data_source,
1838 data_source.su_len) >= 0)
1839 break;
1840 if (errno != EADDRINUSE || tries > 10)
1841 goto bad;
1842 sleep(tries);
1843 }
1844 seteuid(pw->pw_uid);
1845 #ifdef IP_TOS
1846 if (data_source.su_family == AF_INET)
1847 {
1848 on = IPTOS_THROUGHPUT;
1849 if (setsockopt(s, IPPROTO_IP, IP_TOS, &on, sizeof(int)) < 0)
1850 syslog(LOG_WARNING, "data setsockopt (IP_TOS): %m");
1851 }
1852 #endif
1853 #ifdef TCP_NOPUSH
1854 /*
1855 * Turn off push flag to keep sender TCP from sending short packets
1856 * at the boundaries of each write().
1857 */
1858 on = 1;
1859 if (setsockopt(s, IPPROTO_TCP, TCP_NOPUSH, &on, sizeof on) < 0)
1860 syslog(LOG_WARNING, "data setsockopt (TCP_NOPUSH): %m");
1861 #endif
1862 return (fdopen(s, mode));
1863 bad:
1864 /* Return the real value of errno (close may change it) */
1865 t = errno;
1866 seteuid(pw->pw_uid);
1867 close(s);
1868 errno = t;
1869 return (NULL);
1870 }
1871
1872 static FILE *
1873 dataconn(char *name, off_t size, char *mode)
1874 {
1875 char sizebuf[32];
1876 FILE *file;
1877 int retry = 0, tos, conerrno;
1878
1879 file_size = size;
1880 byte_count = 0;
1881 if (size != -1)
1882 snprintf(sizebuf, sizeof(sizebuf),
1883 " (%jd bytes)", (intmax_t)size);
1884 else
1885 *sizebuf = '\0';
1886 if (pdata >= 0) {
1887 union sockunion from;
1888 socklen_t fromlen = ctrl_addr.su_len;
1889 int flags, s;
1890 struct timeval timeout;
1891 fd_set set;
1892
1893 FD_ZERO(&set);
1894 FD_SET(pdata, &set);
1895
1896 timeout.tv_usec = 0;
1897 timeout.tv_sec = 120;
1898
1899 /*
1900 * Granted a socket is in the blocking I/O mode,
1901 * accept() will block after a successful select()
1902 * if the selected connection dies in between.
1903 * Therefore set the non-blocking I/O flag here.
1904 */
1905 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 ||
1906 fcntl(pdata, F_SETFL, flags | O_NONBLOCK) == -1)
1907 goto pdata_err;
1908 if (select(pdata+1, &set, NULL, NULL, &timeout) <= 0 ||
1909 (s = accept(pdata, (struct sockaddr *) &from, &fromlen)) < 0)
1910 goto pdata_err;
1911 close(pdata);
1912 pdata = s;
1913 /*
1914 * Unset the inherited non-blocking I/O flag
1915 * on the child socket so stdio can work on it.
1916 */
1917 if ((flags = fcntl(pdata, F_GETFL, 0)) == -1 ||
1918 fcntl(pdata, F_SETFL, flags & ~O_NONBLOCK) == -1)
1919 goto pdata_err;
1920 #ifdef IP_TOS
1921 if (from.su_family == AF_INET)
1922 {
1923 tos = IPTOS_THROUGHPUT;
1924 if (setsockopt(s, IPPROTO_IP, IP_TOS, &tos, sizeof(int)) < 0)
1925 syslog(LOG_WARNING, "pdata setsockopt (IP_TOS): %m");
1926 }
1927 #endif
1928 reply(150, "Opening %s mode data connection for '%s'%s.",
1929 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf);
1930 return (fdopen(pdata, mode));
1931 pdata_err:
1932 reply(425, "Can't open data connection.");
1933 close(pdata);
1934 pdata = -1;
1935 return (NULL);
1936 }
1937 if (data >= 0) {
1938 reply(125, "Using existing data connection for '%s'%s.",
1939 name, sizebuf);
1940 usedefault = 1;
1941 return (fdopen(data, mode));
1942 }
1943 if (usedefault)
1944 data_dest = his_addr;
1945 usedefault = 1;
1946 do {
1947 file = getdatasock(mode);
1948 if (file == NULL) {
1949 char hostbuf[NI_MAXHOST], portbuf[NI_MAXSERV];
1950
1951 if (getnameinfo((struct sockaddr *)&data_source,
1952 data_source.su_len,
1953 hostbuf, sizeof(hostbuf) - 1,
1954 portbuf, sizeof(portbuf) - 1,
1955 NI_NUMERICHOST|NI_NUMERICSERV))
1956 *hostbuf = *portbuf = 0;
1957 hostbuf[sizeof(hostbuf) - 1] = 0;
1958 portbuf[sizeof(portbuf) - 1] = 0;
1959 reply(425, "Can't create data socket (%s,%s): %s.",
1960 hostbuf, portbuf, strerror(errno));
1961 return (NULL);
1962 }
1963 data = fileno(file);
1964 conerrno = 0;
1965 if (connect(data, (struct sockaddr *)&data_dest,
1966 data_dest.su_len) == 0)
1967 break;
1968 conerrno = errno;
1969 fclose(file);
1970 data = -1;
1971 if (conerrno == EADDRINUSE) {
1972 sleep(swaitint);
1973 retry += swaitint;
1974 } else {
1975 break;
1976 }
1977 } while (retry <= swaitmax);
1978 if (conerrno != 0) {
1979 reply(425, "Can't build data connection: %s.",
1980 strerror(conerrno));
1981 return (NULL);
1982 }
1983 reply(150, "Opening %s mode data connection for '%s'%s.",
1984 type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf);
1985 return (file);
1986 }
1987
1988 /*
1989 * A helper macro to avoid code duplication
1990 * in send_data() and receive_data().
1991 *
1992 * XXX We have to block SIGURG during putc() because BSD stdio
1993 * is unable to restart interrupted write operations and hence
1994 * the entire buffer contents will be lost as soon as a write()
1995 * call indicates EINTR to stdio.
1996 */
1997 #define FTPD_PUTC(ch, file, label) \
1998 do { \
1999 int ret; \
2000 \
2001 do { \
2002 START_UNSAFE; \
2003 ret = putc((ch), (file)); \
2004 END_UNSAFE; \
2005 CHECKOOB(return (-1)) \
2006 else if (ferror(file)) \
2007 goto label; \
2008 clearerr(file); \
2009 } while (ret == EOF); \
2010 } while (0)
2011
2012 /*
2013 * Tranfer the contents of "instr" to "outstr" peer using the appropriate
2014 * encapsulation of the data subject to Mode, Structure, and Type.
2015 *
2016 * NB: Form isn't handled.
2017 */
2018 static int
2019 send_data(FILE *instr, FILE *outstr, size_t blksize, off_t filesize, int isreg)
2020 {
2021 int c, cp, filefd, netfd;
2022 char *buf;
2023
2024 STARTXFER;
2025
2026 switch (type) {
2027
2028 case TYPE_A:
2029 cp = EOF;
2030 for (;;) {
2031 c = getc(instr);
2032 CHECKOOB(return (-1))
2033 else if (c == EOF && ferror(instr))
2034 goto file_err;
2035 if (c == EOF) {
2036 if (ferror(instr)) { /* resume after OOB */
2037 clearerr(instr);
2038 continue;
2039 }
2040 if (feof(instr)) /* EOF */
2041 break;
2042 syslog(LOG_ERR, "Internal: impossible condition"
2043 " on file after getc()");
2044 goto file_err;
2045 }
2046 if (c == '\n' && cp != '\r') {
2047 FTPD_PUTC('\r', outstr, data_err);
2048 byte_count++;
2049 }
2050 FTPD_PUTC(c, outstr, data_err);
2051 byte_count++;
2052 cp = c;
2053 }
2054 #ifdef notyet /* BSD stdio isn't ready for that */
2055 while (fflush(outstr) == EOF) {
2056 CHECKOOB(return (-1))
2057 else
2058 goto data_err;
2059 clearerr(outstr);
2060 }
2061 ENDXFER;
2062 #else
2063 ENDXFER;
2064 if (fflush(outstr) == EOF)
2065 goto data_err;
2066 #endif
2067 reply(226, "Transfer complete.");
2068 return (0);
2069
2070 case TYPE_I:
2071 case TYPE_L:
2072 /*
2073 * isreg is only set if we are not doing restart and we
2074 * are sending a regular file
2075 */
2076 netfd = fileno(outstr);
2077 filefd = fileno(instr);
2078
2079 if (isreg) {
2080 char *msg = "Transfer complete.";
2081 off_t cnt, offset;
2082 int err;
2083
2084 cnt = offset = 0;
2085
2086 while (filesize > 0) {
2087 err = sendfile(filefd, netfd, offset, 0,
2088 NULL, &cnt, 0);
2089 /*
2090 * Calculate byte_count before OOB processing.
2091 * It can be used in myoob() later.
2092 */
2093 byte_count += cnt;
2094 offset += cnt;
2095 filesize -= cnt;
2096 CHECKOOB(return (-1))
2097 else if (err == -1) {
2098 if (errno != EINTR &&
2099 cnt == 0 && offset == 0)
2100 goto oldway;
2101 goto data_err;
2102 }
2103 if (err == -1) /* resume after OOB */
2104 continue;
2105 /*
2106 * We hit the EOF prematurely.
2107 * Perhaps the file was externally truncated.
2108 */
2109 if (cnt == 0) {
2110 msg = "Transfer finished due to "
2111 "premature end of file.";
2112 break;
2113 }
2114 }
2115 ENDXFER;
2116 reply(226, "%s", msg);
2117 return (0);
2118 }
2119
2120 oldway:
2121 if ((buf = malloc(blksize)) == NULL) {
2122 ENDXFER;
2123 reply(451, "Ran out of memory.");
2124 return (-1);
2125 }
2126
2127 for (;;) {
2128 int cnt, len;
2129 char *bp;
2130
2131 cnt = read(filefd, buf, blksize);
2132 CHECKOOB(free(buf); return (-1))
2133 else if (cnt < 0) {
2134 free(buf);
2135 goto file_err;
2136 }
2137 if (cnt < 0) /* resume after OOB */
2138 continue;
2139 if (cnt == 0) /* EOF */
2140 break;
2141 for (len = cnt, bp = buf; len > 0;) {
2142 cnt = write(netfd, bp, len);
2143 CHECKOOB(free(buf); return (-1))
2144 else if (cnt < 0) {
2145 free(buf);
2146 goto data_err;
2147 }
2148 if (cnt <= 0)
2149 continue;
2150 len -= cnt;
2151 bp += cnt;
2152 byte_count += cnt;
2153 }
2154 }
2155 ENDXFER;
2156 free(buf);
2157 reply(226, "Transfer complete.");
2158 return (0);
2159 default:
2160 ENDXFER;
2161 reply(550, "Unimplemented TYPE %d in send_data.", type);
2162 return (-1);
2163 }
2164
2165 data_err:
2166 ENDXFER;
2167 perror_reply(426, "Data connection");
2168 return (-1);
2169
2170 file_err:
2171 ENDXFER;
2172 perror_reply(551, "Error on input file");
2173 return (-1);
2174 }
2175
2176 /*
2177 * Transfer data from peer to "outstr" using the appropriate encapulation of
2178 * the data subject to Mode, Structure, and Type.
2179 *
2180 * N.B.: Form isn't handled.
2181 */
2182 static int
2183 receive_data(FILE *instr, FILE *outstr)
2184 {
2185 int c, cp;
2186 int bare_lfs = 0;
2187
2188 STARTXFER;
2189
2190 switch (type) {
2191
2192 case TYPE_I:
2193 case TYPE_L:
2194 for (;;) {
2195 int cnt, len;
2196 char *bp;
2197 char buf[BUFSIZ];
2198
2199 cnt = read(fileno(instr), buf, sizeof(buf));
2200 CHECKOOB(return (-1))
2201 else if (cnt < 0)
2202 goto data_err;
2203 if (cnt < 0) /* resume after OOB */
2204 continue;
2205 if (cnt == 0) /* EOF */
2206 break;
2207 for (len = cnt, bp = buf; len > 0;) {
2208 cnt = write(fileno(outstr), bp, len);
2209 CHECKOOB(return (-1))
2210 else if (cnt < 0)
2211 goto file_err;
2212 if (cnt <= 0)
2213 continue;
2214 len -= cnt;
2215 bp += cnt;
2216 byte_count += cnt;
2217 }
2218 }
2219 ENDXFER;
2220 return (0);
2221
2222 case TYPE_E:
2223 ENDXFER;
2224 reply(553, "TYPE E not implemented.");
2225 return (-1);
2226
2227 case TYPE_A:
2228 cp = EOF;
2229 for (;;) {
2230 c = getc(instr);
2231 CHECKOOB(return (-1))
2232 else if (c == EOF && ferror(instr))
2233 goto data_err;
2234 if (c == EOF && ferror(instr)) { /* resume after OOB */
2235 clearerr(instr);
2236 continue;
2237 }
2238
2239 if (cp == '\r') {
2240 if (c != '\n')
2241 FTPD_PUTC('\r', outstr, file_err);
2242 } else
2243 if (c == '\n')
2244 bare_lfs++;
2245 if (c == '\r') {
2246 byte_count++;
2247 cp = c;
2248 continue;
2249 }
2250
2251 /* Check for EOF here in order not to lose last \r. */
2252 if (c == EOF) {
2253 if (feof(instr)) /* EOF */
2254 break;
2255 syslog(LOG_ERR, "Internal: impossible condition"
2256 " on data stream after getc()");
2257 goto data_err;
2258 }
2259
2260 byte_count++;
2261 FTPD_PUTC(c, outstr, file_err);
2262 cp = c;
2263 }
2264 #ifdef notyet /* BSD stdio isn't ready for that */
2265 while (fflush(outstr) == EOF) {
2266 CHECKOOB(return (-1))
2267 else
2268 goto file_err;
2269 clearerr(outstr);
2270 }
2271 ENDXFER;
2272 #else
2273 ENDXFER;
2274 if (fflush(outstr) == EOF)
2275 goto file_err;
2276 #endif
2277 if (bare_lfs) {
2278 lreply(226,
2279 "WARNING! %d bare linefeeds received in ASCII mode.",
2280 bare_lfs);
2281 printf(" File may not have transferred correctly.\r\n");
2282 }
2283 return (0);
2284 default:
2285 ENDXFER;
2286 reply(550, "Unimplemented TYPE %d in receive_data.", type);
2287 return (-1);
2288 }
2289
2290 data_err:
2291 ENDXFER;
2292 perror_reply(426, "Data connection");
2293 return (-1);
2294
2295 file_err:
2296 ENDXFER;
2297 perror_reply(452, "Error writing to file");
2298 return (-1);
2299 }
2300
2301 void
2302 statfilecmd(char *filename)
2303 {
2304 FILE *fin;
2305 int atstart;
2306 int c, code;
2307 char line[LINE_MAX];
2308 struct stat st;
2309
2310 code = lstat(filename, &st) == 0 && S_ISDIR(st.st_mode) ? 212 : 213;
2311 snprintf(line, sizeof(line), _PATH_LS " -lgA %s", filename);
2312 fin = ftpd_popen(line, "r");
2313 lreply(code, "Status of %s:", filename);
2314 atstart = 1;
2315 while ((c = getc(fin)) != EOF) {
2316 if (c == '\n') {
2317 if (ferror(stdout)){
2318 perror_reply(421, "Control connection");
2319 ftpd_pclose(fin);
2320 dologout(1);
2321 /* NOTREACHED */
2322 }
2323 if (ferror(fin)) {
2324 perror_reply(551, filename);
2325 ftpd_pclose(fin);
2326 return;
2327 }
2328 putc('\r', stdout);
2329 }
2330 /*
2331 * RFC 959 says neutral text should be prepended before
2332 * a leading 3-digit number followed by whitespace, but
2333 * many ftp clients can be confused by any leading digits,
2334 * as a matter of fact.
2335 */
2336 if (atstart && isdigit(c))
2337 putc(' ', stdout);
2338 putc(c, stdout);
2339 atstart = (c == '\n');
2340 }
2341 ftpd_pclose(fin);
2342 reply(code, "End of status.");
2343 }
2344
2345 void
2346 statcmd(void)
2347 {
2348 union sockunion *su;
2349 u_char *a, *p;
2350 char hname[NI_MAXHOST];
2351 int ispassive;
2352
2353 if (hostinfo) {
2354 lreply(211, "%s FTP server status:", hostname);
2355 printf(" %s\r\n", version);
2356 } else
2357 lreply(211, "FTP server status:");
2358 printf(" Connected to %s", remotehost);
2359 if (!getnameinfo((struct sockaddr *)&his_addr, his_addr.su_len,
2360 hname, sizeof(hname) - 1, NULL, 0, NI_NUMERICHOST)) {
2361 hname[sizeof(hname) - 1] = 0;
2362 if (strcmp(hname, remotehost) != 0)
2363 printf(" (%s)", hname);
2364 }
2365 printf("\r\n");
2366 if (logged_in) {
2367 if (guest)
2368 printf(" Logged in anonymously\r\n");
2369 else
2370 printf(" Logged in as %s\r\n", pw->pw_name);
2371 } else if (askpasswd)
2372 printf(" Waiting for password\r\n");
2373 else
2374 printf(" Waiting for user name\r\n");
2375 printf(" TYPE: %s", typenames[type]);
2376 if (type == TYPE_A || type == TYPE_E)
2377 printf(", FORM: %s", formnames[form]);
2378 if (type == TYPE_L)
2379 #if CHAR_BIT == 8
2380 printf(" %d", CHAR_BIT);
2381 #else
2382 printf(" %d", bytesize); /* need definition! */
2383 #endif
2384 printf("; STRUcture: %s; transfer MODE: %s\r\n",
2385 strunames[stru], modenames[mode]);
2386 if (data != -1)
2387 printf(" Data connection open\r\n");
2388 else if (pdata != -1) {
2389 ispassive = 1;
2390 su = &pasv_addr;
2391 goto printaddr;
2392 } else if (usedefault == 0) {
2393 ispassive = 0;
2394 su = &data_dest;
2395 printaddr:
2396 #define UC(b) (((int) b) & 0xff)
2397 if (epsvall) {
2398 printf(" EPSV only mode (EPSV ALL)\r\n");
2399 goto epsvonly;
2400 }
2401
2402 /* PORT/PASV */
2403 if (su->su_family == AF_INET) {
2404 a = (u_char *) &su->su_sin.sin_addr;
2405 p = (u_char *) &su->su_sin.sin_port;
2406 printf(" %s (%d,%d,%d,%d,%d,%d)\r\n",
2407 ispassive ? "PASV" : "PORT",
2408 UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]),
2409 UC(p[0]), UC(p[1]));
2410 }
2411
2412 /* LPRT/LPSV */
2413 {
2414 int alen, af, i;
2415
2416 switch (su->su_family) {
2417 case AF_INET:
2418 a = (u_char *) &su->su_sin.sin_addr;
2419 p = (u_char *) &su->su_sin.sin_port;
2420 alen = sizeof(su->su_sin.sin_addr);
2421 af = 4;
2422 break;
2423 case AF_INET6:
2424 a = (u_char *) &su->su_sin6.sin6_addr;
2425 p = (u_char *) &su->su_sin6.sin6_port;
2426 alen = sizeof(su->su_sin6.sin6_addr);
2427 af = 6;
2428 break;
2429 default:
2430 af = 0;
2431 break;
2432 }
2433 if (af) {
2434 printf(" %s (%d,%d,", ispassive ? "LPSV" : "LPRT",
2435 af, alen);
2436 for (i = 0; i < alen; i++)
2437 printf("%d,", UC(a[i]));
2438 printf("%d,%d,%d)\r\n", 2, UC(p[0]), UC(p[1]));
2439 }
2440 }
2441
2442 epsvonly:;
2443 /* EPRT/EPSV */
2444 {
2445 int af;
2446
2447 switch (su->su_family) {
2448 case AF_INET:
2449 af = 1;
2450 break;
2451 case AF_INET6:
2452 af = 2;
2453 break;
2454 default:
2455 af = 0;
2456 break;
2457 }
2458 if (af) {
2459 union sockunion tmp;
2460
2461 tmp = *su;
2462 if (tmp.su_family == AF_INET6)
2463 tmp.su_sin6.sin6_scope_id = 0;
2464 if (!getnameinfo((struct sockaddr *)&tmp, tmp.su_len,
2465 hname, sizeof(hname) - 1, NULL, 0,
2466 NI_NUMERICHOST)) {
2467 hname[sizeof(hname) - 1] = 0;
2468 printf(" %s |%d|%s|%d|\r\n",
2469 ispassive ? "EPSV" : "EPRT",
2470 af, hname, htons(tmp.su_port));
2471 }
2472 }
2473 }
2474 #undef UC
2475 } else
2476 printf(" No data connection\r\n");
2477 reply(211, "End of status.");
2478 }
2479
2480 void
2481 fatalerror(char *s)
2482 {
2483
2484 reply(451, "Error in server: %s", s);
2485 reply(221, "Closing connection due to server error.");
2486 dologout(0);
2487 /* NOTREACHED */
2488 }
2489
2490 void
2491 reply(int n, const char *fmt, ...)
2492 {
2493 va_list ap;
2494
2495 printf("%d ", n);
2496 va_start(ap, fmt);
2497 vprintf(fmt, ap);
2498 va_end(ap);
2499 printf("\r\n");
2500 fflush(stdout);
2501 if (ftpdebug) {
2502 syslog(LOG_DEBUG, "<--- %d ", n);
2503 va_start(ap, fmt);
2504 vsyslog(LOG_DEBUG, fmt, ap);
2505 va_end(ap);
2506 }
2507 }
2508
2509 void
2510 lreply(int n, const char *fmt, ...)
2511 {
2512 va_list ap;
2513
2514 printf("%d- ", n);
2515 va_start(ap, fmt);
2516 vprintf(fmt, ap);
2517 va_end(ap);
2518 printf("\r\n");
2519 fflush(stdout);
2520 if (ftpdebug) {
2521 syslog(LOG_DEBUG, "<--- %d- ", n);
2522 va_start(ap, fmt);
2523 vsyslog(LOG_DEBUG, fmt, ap);
2524 va_end(ap);
2525 }
2526 }
2527
2528 static void
2529 ack(char *s)
2530 {
2531
2532 reply(250, "%s command successful.", s);
2533 }
2534
2535 void
2536 nack(char *s)
2537 {
2538
2539 reply(502, "%s command not implemented.", s);
2540 }
2541
2542 /* ARGSUSED */
2543 void
2544 yyerror(char *s)
2545 {
2546 char *cp;
2547
2548 if ((cp = strchr(cbuf,'\n')))
2549 *cp = '\0';
2550 reply(500, "%s: command not understood.", cbuf);
2551 }
2552
2553 void
2554 delete(char *name)
2555 {
2556 struct stat st;
2557
2558 LOGCMD("delete", name);
2559 if (lstat(name, &st) < 0) {
2560 perror_reply(550, name);
2561 return;
2562 }
2563 if (S_ISDIR(st.st_mode)) {
2564 if (rmdir(name) < 0) {
2565 perror_reply(550, name);
2566 return;
2567 }
2568 goto done;
2569 }
2570 if (guest && noguestmod) {
2571 reply(550, "Operation not permitted.");
2572 return;
2573 }
2574 if (unlink(name) < 0) {
2575 perror_reply(550, name);
2576 return;
2577 }
2578 done:
2579 ack("DELE");
2580 }
2581
2582 void
2583 cwd(char *path)
2584 {
2585
2586 if (chdir(path) < 0)
2587 perror_reply(550, path);
2588 else
2589 ack("CWD");
2590 }
2591
2592 void
2593 makedir(char *name)
2594 {
2595 char *s;
2596
2597 LOGCMD("mkdir", name);
2598 if (guest && noguestmkd)
2599 reply(550, "Operation not permitted.");
2600 else if (mkdir(name, 0777) < 0)
2601 perror_reply(550, name);
2602 else {
2603 if ((s = doublequote(name)) == NULL)
2604 fatalerror("Ran out of memory.");
2605 reply(257, "\"%s\" directory created.", s);
2606 free(s);
2607 }
2608 }
2609
2610 void
2611 removedir(char *name)
2612 {
2613
2614 LOGCMD("rmdir", name);
2615 if (rmdir(name) < 0)
2616 perror_reply(550, name);
2617 else
2618 ack("RMD");
2619 }
2620
2621 void
2622 pwd(void)
2623 {
2624 char *s, path[MAXPATHLEN + 1];
2625
2626 if (getcwd(path, sizeof(path)) == NULL)
2627 perror_reply(550, "Get current directory");
2628 else {
2629 if ((s = doublequote(path)) == NULL)
2630 fatalerror("Ran out of memory.");
2631 reply(257, "\"%s\" is current directory.", s);
2632 free(s);
2633 }
2634 }
2635
2636 char *
2637 renamefrom(char *name)
2638 {
2639 struct stat st;
2640
2641 if (guest && noguestmod) {
2642 reply(550, "Operation not permitted.");
2643 return (NULL);
2644 }
2645 if (lstat(name, &st) < 0) {
2646 perror_reply(550, name);
2647 return (NULL);
2648 }
2649 reply(350, "File exists, ready for destination name.");
2650 return (name);
2651 }
2652
2653 void
2654 renamecmd(char *from, char *to)
2655 {
2656 struct stat st;
2657
2658 LOGCMD2("rename", from, to);
2659
2660 if (guest && (stat(to, &st) == 0)) {
2661 reply(550, "%s: permission denied.", to);
2662 return;
2663 }
2664
2665 if (rename(from, to) < 0)
2666 perror_reply(550, "rename");
2667 else
2668 ack("RNTO");
2669 }
2670
2671 static void
2672 dolog(struct sockaddr *who)
2673 {
2674 char who_name[NI_MAXHOST];
2675
2676 realhostname_sa(remotehost, sizeof(remotehost) - 1, who, who->sa_len);
2677 remotehost[sizeof(remotehost) - 1] = 0;
2678 if (getnameinfo(who, who->sa_len,
2679 who_name, sizeof(who_name) - 1, NULL, 0, NI_NUMERICHOST))
2680 *who_name = 0;
2681 who_name[sizeof(who_name) - 1] = 0;
2682
2683 #ifdef SETPROCTITLE
2684 #ifdef VIRTUAL_HOSTING
2685 if (thishost != firsthost)
2686 snprintf(proctitle, sizeof(proctitle), "%s: connected (to %s)",
2687 remotehost, hostname);
2688 else
2689 #endif
2690 snprintf(proctitle, sizeof(proctitle), "%s: connected",
2691 remotehost);
2692 setproctitle("%s", proctitle);
2693 #endif /* SETPROCTITLE */
2694
2695 if (logging) {
2696 #ifdef VIRTUAL_HOSTING
2697 if (thishost != firsthost)
2698 syslog(LOG_INFO, "connection from %s (%s) to %s",
2699 remotehost, who_name, hostname);
2700 else
2701 #endif
2702 syslog(LOG_INFO, "connection from %s (%s)",
2703 remotehost, who_name);
2704 }
2705 }
2706
2707 /*
2708 * Record logout in wtmp file
2709 * and exit with supplied status.
2710 */
2711 void
2712 dologout(int status)
2713 {
2714
2715 if (logged_in && dowtmp) {
2716 seteuid(0);
2717 ftpd_logwtmp(ttyline, "", NULL);
2718 }
2719 /* beware of flushing buffers after a SIGPIPE */
2720 _exit(status);
2721 }
2722
2723 static void
2724 sigurg(int signo)
2725 {
2726
2727 recvurg = 1;
2728 }
2729
2730 static void
2731 maskurg(int flag)
2732 {
2733 int oerrno;
2734 sigset_t sset;
2735
2736 if (!transflag) {
2737 syslog(LOG_ERR, "Internal: maskurg() while no transfer");
2738 return;
2739 }
2740 oerrno = errno;
2741 sigemptyset(&sset);
2742 sigaddset(&sset, SIGURG);
2743 sigprocmask(flag ? SIG_BLOCK : SIG_UNBLOCK, &sset, NULL);
2744 errno = oerrno;
2745 }
2746
2747 static void
2748 flagxfer(int flag)
2749 {
2750
2751 if (flag) {
2752 if (transflag)
2753 syslog(LOG_ERR, "Internal: flagxfer(1): "
2754 "transfer already under way");
2755 transflag = 1;
2756 maskurg(0);
2757 recvurg = 0;
2758 } else {
2759 if (!transflag)
2760 syslog(LOG_ERR, "Internal: flagxfer(0): "
2761 "no active transfer");
2762 maskurg(1);
2763 transflag = 0;
2764 }
2765 }
2766
2767 /*
2768 * Returns 0 if OK to resume or -1 if abort requested.
2769 */
2770 static int
2771 myoob(void)
2772 {
2773 char *cp;
2774 int ret;
2775
2776 if (!transflag) {
2777 syslog(LOG_ERR, "Internal: myoob() while no transfer");
2778 return (0);
2779 }
2780 cp = tmpline;
2781 ret = get_line(cp, 7, stdin);
2782 if (ret == -1) {
2783 reply(221, "You could at least say goodbye.");
2784 dologout(0);
2785 } else if (ret == -2) {
2786 /* Ignore truncated command. */
2787 return (0);
2788 }
2789 upper(cp);
2790 if (strcmp(cp, "ABOR\r\n") == 0) {
2791 tmpline[0] = '\0';
2792 reply(426, "Transfer aborted. Data connection closed.");
2793 reply(226, "Abort successful.");
2794 return (-1);
2795 }
2796 if (strcmp(cp, "STAT\r\n") == 0) {
2797 tmpline[0] = '\0';
2798 if (file_size != -1)
2799 reply(213, "Status: %jd of %jd bytes transferred.",
2800 (intmax_t)byte_count, (intmax_t)file_size);
2801 else
2802 reply(213, "Status: %jd bytes transferred.",
2803 (intmax_t)byte_count);
2804 }
2805 return (0);
2806 }
2807
2808 /*
2809 * Note: a response of 425 is not mentioned as a possible response to
2810 * the PASV command in RFC959. However, it has been blessed as
2811 * a legitimate response by Jon Postel in a telephone conversation
2812 * with Rick Adams on 25 Jan 89.
2813 */
2814 void
2815 passive(void)
2816 {
2817 socklen_t len;
2818 int on;
2819 char *p, *a;
2820
2821 if (pdata >= 0) /* close old port if one set */
2822 close(pdata);
2823
2824 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0);
2825 if (pdata < 0) {
2826 perror_reply(425, "Can't open passive connection");
2827 return;
2828 }
2829 on = 1;
2830 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
2831 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m");
2832
2833 seteuid(0);
2834
2835 #ifdef IP_PORTRANGE
2836 if (ctrl_addr.su_family == AF_INET) {
2837 on = restricted_data_ports ? IP_PORTRANGE_HIGH
2838 : IP_PORTRANGE_DEFAULT;
2839
2840 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE,
2841 &on, sizeof(on)) < 0)
2842 goto pasv_error;
2843 }
2844 #endif
2845 #ifdef IPV6_PORTRANGE
2846 if (ctrl_addr.su_family == AF_INET6) {
2847 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH
2848 : IPV6_PORTRANGE_DEFAULT;
2849
2850 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE,
2851 &on, sizeof(on)) < 0)
2852 goto pasv_error;
2853 }
2854 #endif
2855
2856 pasv_addr = ctrl_addr;
2857 pasv_addr.su_port = 0;
2858 if (bind(pdata, (struct sockaddr *)&pasv_addr, pasv_addr.su_len) < 0)
2859 goto pasv_error;
2860
2861 seteuid(pw->pw_uid);
2862
2863 len = sizeof(pasv_addr);
2864 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0)
2865 goto pasv_error;
2866 if (listen(pdata, 1) < 0)
2867 goto pasv_error;
2868 if (pasv_addr.su_family == AF_INET)
2869 a = (char *) &pasv_addr.su_sin.sin_addr;
2870 else if (pasv_addr.su_family == AF_INET6 &&
2871 IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr))
2872 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12];
2873 else
2874 goto pasv_error;
2875
2876 p = (char *) &pasv_addr.su_port;
2877
2878 #define UC(b) (((int) b) & 0xff)
2879
2880 reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]),
2881 UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1]));
2882 return;
2883
2884 pasv_error:
2885 seteuid(pw->pw_uid);
2886 close(pdata);
2887 pdata = -1;
2888 perror_reply(425, "Can't open passive connection");
2889 return;
2890 }
2891
2892 /*
2893 * Long Passive defined in RFC 1639.
2894 * 228 Entering Long Passive Mode
2895 * (af, hal, h1, h2, h3,..., pal, p1, p2...)
2896 */
2897
2898 void
2899 long_passive(char *cmd, int pf)
2900 {
2901 socklen_t len;
2902 int on;
2903 char *p, *a;
2904
2905 if (pdata >= 0) /* close old port if one set */
2906 close(pdata);
2907
2908 if (pf != PF_UNSPEC) {
2909 if (ctrl_addr.su_family != pf) {
2910 switch (ctrl_addr.su_family) {
2911 case AF_INET:
2912 pf = 1;
2913 break;
2914 case AF_INET6:
2915 pf = 2;
2916 break;
2917 default:
2918 pf = 0;
2919 break;
2920 }
2921 /*
2922 * XXX
2923 * only EPRT/EPSV ready clients will understand this
2924 */
2925 if (strcmp(cmd, "EPSV") == 0 && pf) {
2926 reply(522, "Network protocol mismatch, "
2927 "use (%d)", pf);
2928 } else
2929 reply(501, "Network protocol mismatch."); /*XXX*/
2930
2931 return;
2932 }
2933 }
2934
2935 pdata = socket(ctrl_addr.su_family, SOCK_STREAM, 0);
2936 if (pdata < 0) {
2937 perror_reply(425, "Can't open passive connection");
2938 return;
2939 }
2940 on = 1;
2941 if (setsockopt(pdata, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
2942 syslog(LOG_WARNING, "pdata setsockopt (SO_REUSEADDR): %m");
2943
2944 seteuid(0);
2945
2946 pasv_addr = ctrl_addr;
2947 pasv_addr.su_port = 0;
2948 len = pasv_addr.su_len;
2949
2950 #ifdef IP_PORTRANGE
2951 if (ctrl_addr.su_family == AF_INET) {
2952 on = restricted_data_ports ? IP_PORTRANGE_HIGH
2953 : IP_PORTRANGE_DEFAULT;
2954
2955 if (setsockopt(pdata, IPPROTO_IP, IP_PORTRANGE,
2956 &on, sizeof(on)) < 0)
2957 goto pasv_error;
2958 }
2959 #endif
2960 #ifdef IPV6_PORTRANGE
2961 if (ctrl_addr.su_family == AF_INET6) {
2962 on = restricted_data_ports ? IPV6_PORTRANGE_HIGH
2963 : IPV6_PORTRANGE_DEFAULT;
2964
2965 if (setsockopt(pdata, IPPROTO_IPV6, IPV6_PORTRANGE,
2966 &on, sizeof(on)) < 0)
2967 goto pasv_error;
2968 }
2969 #endif
2970
2971 if (bind(pdata, (struct sockaddr *)&pasv_addr, len) < 0)
2972 goto pasv_error;
2973
2974 seteuid(pw->pw_uid);
2975
2976 if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0)
2977 goto pasv_error;
2978 if (listen(pdata, 1) < 0)
2979 goto pasv_error;
2980
2981 #define UC(b) (((int) b) & 0xff)
2982
2983 if (strcmp(cmd, "LPSV") == 0) {
2984 p = (char *)&pasv_addr.su_port;
2985 switch (pasv_addr.su_family) {
2986 case AF_INET:
2987 a = (char *) &pasv_addr.su_sin.sin_addr;
2988 v4_reply:
2989 reply(228,
2990 "Entering Long Passive Mode (%d,%d,%d,%d,%d,%d,%d,%d,%d)",
2991 4, 4, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]),
2992 2, UC(p[0]), UC(p[1]));
2993 return;
2994 case AF_INET6:
2995 if (IN6_IS_ADDR_V4MAPPED(&pasv_addr.su_sin6.sin6_addr)) {
2996 a = (char *) &pasv_addr.su_sin6.sin6_addr.s6_addr[12];
2997 goto v4_reply;
2998 }
2999 a = (char *) &pasv_addr.su_sin6.sin6_addr;
3000 reply(228,
3001 "Entering Long Passive Mode "
3002 "(%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d,%d)",
3003 6, 16, UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]),
3004 UC(a[4]), UC(a[5]), UC(a[6]), UC(a[7]),
3005 UC(a[8]), UC(a[9]), UC(a[10]), UC(a[11]),
3006 UC(a[12]), UC(a[13]), UC(a[14]), UC(a[15]),
3007 2, UC(p[0]), UC(p[1]));
3008 return;
3009 }
3010 } else if (strcmp(cmd, "EPSV") == 0) {
3011 switch (pasv_addr.su_family) {
3012 case AF_INET:
3013 case AF_INET6:
3014 reply(229, "Entering Extended Passive Mode (|||%d|)",
3015 ntohs(pasv_addr.su_port));
3016 return;
3017 }
3018 } else {
3019 /* more proper error code? */
3020 }
3021
3022 pasv_error:
3023 seteuid(pw->pw_uid);
3024 close(pdata);
3025 pdata = -1;
3026 perror_reply(425, "Can't open passive connection");
3027 return;
3028 }
3029
3030 /*
3031 * Generate unique name for file with basename "local"
3032 * and open the file in order to avoid possible races.
3033 * Try "local" first, then "local.1", "local.2" etc, up to "local.99".
3034 * Return descriptor to the file, set "name" to its name.
3035 *
3036 * Generates failure reply on error.
3037 */
3038 static int
3039 guniquefd(char *local, char **name)
3040 {
3041 static char new[MAXPATHLEN];
3042 struct stat st;
3043 char *cp;
3044 int count;
3045 int fd;
3046
3047 cp = strrchr(local, '/');
3048 if (cp)
3049 *cp = '\0';
3050 if (stat(cp ? local : ".", &st) < 0) {
3051 perror_reply(553, cp ? local : ".");
3052 return (-1);
3053 }
3054 if (cp) {
3055 /*
3056 * Let not overwrite dirname with counter suffix.
3057 * -4 is for /nn\0
3058 * In this extreme case dot won't be put in front of suffix.
3059 */
3060 if (strlen(local) > sizeof(new) - 4) {
3061 reply(553, "Pathname too long.");
3062 return (-1);
3063 }
3064 *cp = '/';
3065 }
3066 /* -4 is for the .nn<null> we put on the end below */
3067 snprintf(new, sizeof(new) - 4, "%s", local);
3068 cp = new + strlen(new);
3069 /*
3070 * Don't generate dotfile unless requested explicitly.
3071 * This covers the case when basename gets truncated off
3072 * by buffer size.
3073 */
3074 if (cp > new && cp[-1] != '/')
3075 *cp++ = '.';
3076 for (count = 0; count < 100; count++) {
3077 /* At count 0 try unmodified name */
3078 if (count)
3079 sprintf(cp, "%d", count);
3080 if ((fd = open(count ? new : local,
3081 O_RDWR | O_CREAT | O_EXCL, 0666)) >= 0) {
3082 *name = count ? new : local;
3083 return (fd);
3084 }
3085 if (errno != EEXIST) {
3086 perror_reply(553, count ? new : local);
3087 return (-1);
3088 }
3089 }
3090 reply(452, "Unique file name cannot be created.");
3091 return (-1);
3092 }
3093
3094 /*
3095 * Format and send reply containing system error number.
3096 */
3097 void
3098 perror_reply(int code, char *string)
3099 {
3100
3101 reply(code, "%s: %s.", string, strerror(errno));
3102 }
3103
3104 static char *onefile[] = {
3105 "",
3106 0
3107 };
3108
3109 void
3110 send_file_list(char *whichf)
3111 {
3112 struct stat st;
3113 DIR *dirp = NULL;
3114 struct dirent *dir;
3115 FILE *dout = NULL;
3116 char **dirlist, *dirname;
3117 int simple = 0;
3118 int freeglob = 0;
3119 glob_t gl;
3120
3121 if (strpbrk(whichf, "~{[*?") != NULL) {
3122 int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_TILDE;
3123
3124 memset(&gl, 0, sizeof(gl));
3125 gl.gl_matchc = MAXGLOBARGS;
3126 /*flags |= GLOB_LIMIT;*/
3127 freeglob = 1;
3128 if (glob(whichf, flags, 0, &gl)) {
3129 reply(550, "No matching files found.");
3130 goto out;
3131 } else if (gl.gl_pathc == 0) {
3132 errno = ENOENT;
3133 perror_reply(550, whichf);
3134 goto out;
3135 }
3136 dirlist = gl.gl_pathv;
3137 } else {
3138 onefile[0] = whichf;
3139 dirlist = onefile;
3140 simple = 1;
3141 }
3142
3143 while ((dirname = *dirlist++)) {
3144 if (stat(dirname, &st) < 0) {
3145 /*
3146 * If user typed "ls -l", etc, and the client
3147 * used NLST, do what the user meant.
3148 */
3149 if (dirname[0] == '-' && *dirlist == NULL &&
3150 dout == NULL)
3151 retrieve(_PATH_LS " %s", dirname);
3152 else
3153 perror_reply(550, whichf);
3154 goto out;
3155 }
3156
3157 if (S_ISREG(st.st_mode)) {
3158 if (dout == NULL) {
3159 dout = dataconn("file list", -1, "w");
3160 if (dout == NULL)
3161 goto out;
3162 STARTXFER;
3163 }
3164 START_UNSAFE;
3165 fprintf(dout, "%s%s\n", dirname,
3166 type == TYPE_A ? "\r" : "");
3167 END_UNSAFE;
3168 if (ferror(dout))
3169 goto data_err;
3170 byte_count += strlen(dirname) +
3171 (type == TYPE_A ? 2 : 1);
3172 CHECKOOB(goto abrt);
3173 continue;
3174 } else if (!S_ISDIR(st.st_mode))
3175 continue;
3176
3177 if ((dirp = opendir(dirname)) == NULL)
3178 continue;
3179
3180 while ((dir = readdir(dirp)) != NULL) {
3181 char nbuf[MAXPATHLEN];
3182
3183 CHECKOOB(goto abrt);
3184
3185 if (strcmp(dir->d_name, ".") == 0)
3186 continue;
3187 if (strcmp(dir->d_name, "..") == 0)
3188 continue;
3189
3190 snprintf(nbuf, sizeof(nbuf),
3191 "%s/%s", dirname, dir->d_name);
3192
3193 /*
3194 * We have to do a stat to insure it's
3195 * not a directory or special file.
3196 */
3197 if (simple || (stat(nbuf, &st) == 0 &&
3198 S_ISREG(st.st_mode))) {
3199 if (dout == NULL) {
3200 dout = dataconn("file list", -1, "w");
3201 if (dout == NULL)
3202 goto out;
3203 STARTXFER;
3204 }
3205 START_UNSAFE;
3206 if (nbuf[0] == '.' && nbuf[1] == '/')
3207 fprintf(dout, "%s%s\n", &nbuf[2],
3208 type == TYPE_A ? "\r" : "");
3209 else
3210 fprintf(dout, "%s%s\n", nbuf,
3211 type == TYPE_A ? "\r" : "");
3212 END_UNSAFE;
3213 if (ferror(dout))
3214 goto data_err;
3215 byte_count += strlen(nbuf) +
3216 (type == TYPE_A ? 2 : 1);
3217 CHECKOOB(goto abrt);
3218 }
3219 }
3220 closedir(dirp);
3221 dirp = NULL;
3222 }
3223
3224 if (dout == NULL)
3225 reply(550, "No files found.");
3226 else if (ferror(dout))
3227 data_err: perror_reply(550, "Data connection");
3228 else
3229 reply(226, "Transfer complete.");
3230 out:
3231 if (dout) {
3232 ENDXFER;
3233 abrt:
3234 fclose(dout);
3235 data = -1;
3236 pdata = -1;
3237 }
3238 if (dirp)
3239 closedir(dirp);
3240 if (freeglob) {
3241 freeglob = 0;
3242 globfree(&gl);
3243 }
3244 }
3245
3246 void
3247 reapchild(int signo)
3248 {
3249 while (waitpid(-1, NULL, WNOHANG) > 0);
3250 }
3251
3252 static void
3253 appendf(char **strp, char *fmt, ...)
3254 {
3255 va_list ap;
3256 char *ostr, *p;
3257
3258 va_start(ap, fmt);
3259 vasprintf(&p, fmt, ap);
3260 va_end(ap);
3261 if (p == NULL)
3262 fatalerror("Ran out of memory.");
3263 if (*strp == NULL)
3264 *strp = p;
3265 else {
3266 ostr = *strp;
3267 asprintf(strp, "%s%s", ostr, p);
3268 if (*strp == NULL)
3269 fatalerror("Ran out of memory.");
3270 free(ostr);
3271 }
3272 }
3273
3274 static void
3275 logcmd(char *cmd, char *file1, char *file2, off_t cnt)
3276 {
3277 char *msg = NULL;
3278 char wd[MAXPATHLEN + 1];
3279
3280 if (logging <= 1)
3281 return;
3282
3283 if (getcwd(wd, sizeof(wd) - 1) == NULL)
3284 strcpy(wd, strerror(errno));
3285
3286 appendf(&msg, "%s", cmd);
3287 if (file1)
3288 appendf(&msg, " %s", file1);
3289 if (file2)
3290 appendf(&msg, " %s", file2);
3291 if (cnt >= 0)
3292 appendf(&msg, " = %jd bytes", (intmax_t)cnt);
3293 appendf(&msg, " (wd: %s", wd);
3294 if (guest || dochroot)
3295 appendf(&msg, "; chrooted");
3296 appendf(&msg, ")");
3297 syslog(LOG_INFO, "%s", msg);
3298 free(msg);
3299 }
3300
3301 static void
3302 logxfer(char *name, off_t size, time_t start)
3303 {
3304 char buf[MAXPATHLEN + 1024];
3305 char path[MAXPATHLEN + 1];
3306 time_t now;
3307
3308 if (statfd >= 0) {
3309 time(&now);
3310 if (realpath(name, path) == NULL) {
3311 syslog(LOG_NOTICE, "realpath failed on %s: %m", path);
3312 return;
3313 }
3314 snprintf(buf, sizeof(buf), "%.20s!%s!%s!%s!%jd!%ld\n",
3315 ctime(&now)+4, ident, remotehost,
3316 path, (intmax_t)size,
3317 (long)(now - start + (now == start)));
3318 write(statfd, buf, strlen(buf));
3319 }
3320 }
3321
3322 static char *
3323 doublequote(char *s)
3324 {
3325 int n;
3326 char *p, *s2;
3327
3328 for (p = s, n = 0; *p; p++)
3329 if (*p == '"')
3330 n++;
3331
3332 if ((s2 = malloc(p - s + n + 1)) == NULL)
3333 return (NULL);
3334
3335 for (p = s2; *s; s++, p++) {
3336 if ((*p = *s) == '"')
3337 *(++p) = '"';
3338 }
3339 *p = '\0';
3340
3341 return (s2);
3342 }
3343
3344 /* setup server socket for specified address family */
3345 /* if af is PF_UNSPEC more than one socket may be returned */
3346 /* the returned list is dynamically allocated, so caller needs to free it */
3347 static int *
3348 socksetup(int af, char *bindname, const char *bindport)
3349 {
3350 struct addrinfo hints, *res, *r;
3351 int error, maxs, *s, *socks;
3352 const int on = 1;
3353
3354 memset(&hints, 0, sizeof(hints));
3355 hints.ai_flags = AI_PASSIVE;
3356 hints.ai_family = af;
3357 hints.ai_socktype = SOCK_STREAM;
3358 error = getaddrinfo(bindname, bindport, &hints, &res);
3359 if (error) {
3360 syslog(LOG_ERR, "%s", gai_strerror(error));
3361 if (error == EAI_SYSTEM)
3362 syslog(LOG_ERR, "%s", strerror(errno));
3363 return NULL;
3364 }
3365
3366 /* Count max number of sockets we may open */
3367 for (maxs = 0, r = res; r; r = r->ai_next, maxs++)
3368 ;
3369 socks = malloc((maxs + 1) * sizeof(int));
3370 if (!socks) {
3371 freeaddrinfo(res);
3372 syslog(LOG_ERR, "couldn't allocate memory for sockets");
3373 return NULL;
3374 }
3375
3376 *socks = 0; /* num of sockets counter at start of array */
3377 s = socks + 1;
3378 for (r = res; r; r = r->ai_next) {
3379 *s = socket(r->ai_family, r->ai_socktype, r->ai_protocol);
3380 if (*s < 0) {
3381 syslog(LOG_DEBUG, "control socket: %m");
3382 continue;
3383 }
3384 if (setsockopt(*s, SOL_SOCKET, SO_REUSEADDR,
3385 &on, sizeof(on)) < 0)
3386 syslog(LOG_WARNING,
3387 "control setsockopt (SO_REUSEADDR): %m");
3388 if (r->ai_family == AF_INET6) {
3389 if (setsockopt(*s, IPPROTO_IPV6, IPV6_V6ONLY,
3390 &on, sizeof(on)) < 0)
3391 syslog(LOG_WARNING,
3392 "control setsockopt (IPV6_V6ONLY): %m");
3393 }
3394 if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) {
3395 syslog(LOG_DEBUG, "control bind: %m");
3396 close(*s);
3397 continue;
3398 }
3399 (*socks)++;
3400 s++;
3401 }
3402
3403 if (res)
3404 freeaddrinfo(res);
3405
3406 if (*socks == 0) {
3407 syslog(LOG_ERR, "control socket: Couldn't bind to any socket");
3408 free(socks);
3409 return NULL;
3410 }
3411 return(socks);
3412 }
DragonFly BSD