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