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flockfile(3): Update FreeBSD CVS ID, bump .Dd and add some references.
[dragonfly.git] / crypto / openssh-5 / sftp-server.c
blob24c4ff717227550f0c25fd2cc9df2153321f0d06
1 /* $OpenBSD: sftp-server.c,v 1.84 2008/06/26 06:10:09 djm Exp $ */
2 /*
3 * Copyright (c) 2000-2004 Markus Friedl. All rights reserved.
4 *
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
8 *
9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 */
17
18 #include "includes.h"
19
20 #include <sys/types.h>
21 #include <sys/param.h>
22 #include <sys/stat.h>
23 #ifdef HAVE_SYS_TIME_H
24 # include <sys/time.h>
25 #endif
26 #ifdef HAVE_SYS_MOUNT_H
27 #include <sys/mount.h>
28 #endif
29 #ifdef HAVE_SYS_STATVFS_H
30 #include <sys/statvfs.h>
31 #endif
32
33 #include <dirent.h>
34 #include <errno.h>
35 #include <fcntl.h>
36 #include <pwd.h>
37 #include <stdlib.h>
38 #include <stdio.h>
39 #include <string.h>
40 #include <pwd.h>
41 #include <time.h>
42 #include <unistd.h>
43 #include <stdarg.h>
44
45 #include "xmalloc.h"
46 #include "buffer.h"
47 #include "log.h"
48 #include "misc.h"
49 #include "uidswap.h"
50
51 #include "sftp.h"
52 #include "sftp-common.h"
53
54 /* helper */
55 #define get_int64() buffer_get_int64(&iqueue);
56 #define get_int() buffer_get_int(&iqueue);
57 #define get_string(lenp) buffer_get_string(&iqueue, lenp);
58
59 /* Our verbosity */
60 LogLevel log_level = SYSLOG_LEVEL_ERROR;
61
62 /* Our client */
63 struct passwd *pw = NULL;
64 char *client_addr = NULL;
65
66 /* input and output queue */
67 Buffer iqueue;
68 Buffer oqueue;
69
70 /* Version of client */
71 int version;
72
73 /* portable attributes, etc. */
74
75 typedef struct Stat Stat;
76
77 struct Stat {
78 char *name;
79 char *long_name;
80 Attrib attrib;
81 };
82
83 static int
84 errno_to_portable(int unixerrno)
85 {
86 int ret = 0;
87
88 switch (unixerrno) {
89 case 0:
90 ret = SSH2_FX_OK;
91 break;
92 case ENOENT:
93 case ENOTDIR:
94 case EBADF:
95 case ELOOP:
96 ret = SSH2_FX_NO_SUCH_FILE;
97 break;
98 case EPERM:
99 case EACCES:
100 case EFAULT:
101 ret = SSH2_FX_PERMISSION_DENIED;
102 break;
103 case ENAMETOOLONG:
104 case EINVAL:
105 ret = SSH2_FX_BAD_MESSAGE;
106 break;
107 case ENOSYS:
108 ret = SSH2_FX_OP_UNSUPPORTED;
109 break;
110 default:
111 ret = SSH2_FX_FAILURE;
112 break;
113 }
114 return ret;
115 }
116
117 static int
118 flags_from_portable(int pflags)
119 {
120 int flags = 0;
121
122 if ((pflags & SSH2_FXF_READ) &&
123 (pflags & SSH2_FXF_WRITE)) {
124 flags = O_RDWR;
125 } else if (pflags & SSH2_FXF_READ) {
126 flags = O_RDONLY;
127 } else if (pflags & SSH2_FXF_WRITE) {
128 flags = O_WRONLY;
129 }
130 if (pflags & SSH2_FXF_CREAT)
131 flags |= O_CREAT;
132 if (pflags & SSH2_FXF_TRUNC)
133 flags |= O_TRUNC;
134 if (pflags & SSH2_FXF_EXCL)
135 flags |= O_EXCL;
136 return flags;
137 }
138
139 static const char *
140 string_from_portable(int pflags)
141 {
142 static char ret[128];
143
144 *ret = '\0';
145
146 #define PAPPEND(str) { \
147 if (*ret != '\0') \
148 strlcat(ret, ",", sizeof(ret)); \
149 strlcat(ret, str, sizeof(ret)); \
150 }
151
152 if (pflags & SSH2_FXF_READ)
153 PAPPEND("READ")
154 if (pflags & SSH2_FXF_WRITE)
155 PAPPEND("WRITE")
156 if (pflags & SSH2_FXF_CREAT)
157 PAPPEND("CREATE")
158 if (pflags & SSH2_FXF_TRUNC)
159 PAPPEND("TRUNCATE")
160 if (pflags & SSH2_FXF_EXCL)
161 PAPPEND("EXCL")
162
163 return ret;
164 }
165
166 static Attrib *
167 get_attrib(void)
168 {
169 return decode_attrib(&iqueue);
170 }
171
172 /* handle handles */
173
174 typedef struct Handle Handle;
175 struct Handle {
176 int use;
177 DIR *dirp;
178 int fd;
179 char *name;
180 u_int64_t bytes_read, bytes_write;
181 int next_unused;
182 };
183
184 enum {
185 HANDLE_UNUSED,
186 HANDLE_DIR,
187 HANDLE_FILE
188 };
189
190 Handle *handles = NULL;
191 u_int num_handles = 0;
192 int first_unused_handle = -1;
193
194 static void handle_unused(int i)
195 {
196 handles[i].use = HANDLE_UNUSED;
197 handles[i].next_unused = first_unused_handle;
198 first_unused_handle = i;
199 }
200
201 static int
202 handle_new(int use, const char *name, int fd, DIR *dirp)
203 {
204 int i;
205
206 if (first_unused_handle == -1) {
207 if (num_handles + 1 <= num_handles)
208 return -1;
209 num_handles++;
210 handles = xrealloc(handles, num_handles, sizeof(Handle));
211 handle_unused(num_handles - 1);
212 }
213
214 i = first_unused_handle;
215 first_unused_handle = handles[i].next_unused;
216
217 handles[i].use = use;
218 handles[i].dirp = dirp;
219 handles[i].fd = fd;
220 handles[i].name = xstrdup(name);
221 handles[i].bytes_read = handles[i].bytes_write = 0;
222
223 return i;
224 }
225
226 static int
227 handle_is_ok(int i, int type)
228 {
229 return i >= 0 && (u_int)i < num_handles && handles[i].use == type;
230 }
231
232 static int
233 handle_to_string(int handle, char **stringp, int *hlenp)
234 {
235 if (stringp == NULL || hlenp == NULL)
236 return -1;
237 *stringp = xmalloc(sizeof(int32_t));
238 put_u32(*stringp, handle);
239 *hlenp = sizeof(int32_t);
240 return 0;
241 }
242
243 static int
244 handle_from_string(const char *handle, u_int hlen)
245 {
246 int val;
247
248 if (hlen != sizeof(int32_t))
249 return -1;
250 val = get_u32(handle);
251 if (handle_is_ok(val, HANDLE_FILE) ||
252 handle_is_ok(val, HANDLE_DIR))
253 return val;
254 return -1;
255 }
256
257 static char *
258 handle_to_name(int handle)
259 {
260 if (handle_is_ok(handle, HANDLE_DIR)||
261 handle_is_ok(handle, HANDLE_FILE))
262 return handles[handle].name;
263 return NULL;
264 }
265
266 static DIR *
267 handle_to_dir(int handle)
268 {
269 if (handle_is_ok(handle, HANDLE_DIR))
270 return handles[handle].dirp;
271 return NULL;
272 }
273
274 static int
275 handle_to_fd(int handle)
276 {
277 if (handle_is_ok(handle, HANDLE_FILE))
278 return handles[handle].fd;
279 return -1;
280 }
281
282 static void
283 handle_update_read(int handle, ssize_t bytes)
284 {
285 if (handle_is_ok(handle, HANDLE_FILE) && bytes > 0)
286 handles[handle].bytes_read += bytes;
287 }
288
289 static void
290 handle_update_write(int handle, ssize_t bytes)
291 {
292 if (handle_is_ok(handle, HANDLE_FILE) && bytes > 0)
293 handles[handle].bytes_write += bytes;
294 }
295
296 static u_int64_t
297 handle_bytes_read(int handle)
298 {
299 if (handle_is_ok(handle, HANDLE_FILE))
300 return (handles[handle].bytes_read);
301 return 0;
302 }
303
304 static u_int64_t
305 handle_bytes_write(int handle)
306 {
307 if (handle_is_ok(handle, HANDLE_FILE))
308 return (handles[handle].bytes_write);
309 return 0;
310 }
311
312 static int
313 handle_close(int handle)
314 {
315 int ret = -1;
316
317 if (handle_is_ok(handle, HANDLE_FILE)) {
318 ret = close(handles[handle].fd);
319 xfree(handles[handle].name);
320 handle_unused(handle);
321 } else if (handle_is_ok(handle, HANDLE_DIR)) {
322 ret = closedir(handles[handle].dirp);
323 xfree(handles[handle].name);
324 handle_unused(handle);
325 } else {
326 errno = ENOENT;
327 }
328 return ret;
329 }
330
331 static void
332 handle_log_close(int handle, char *emsg)
333 {
334 if (handle_is_ok(handle, HANDLE_FILE)) {
335 logit("%s%sclose \"%s\" bytes read %llu written %llu",
336 emsg == NULL ? "" : emsg, emsg == NULL ? "" : " ",
337 handle_to_name(handle),
338 (unsigned long long)handle_bytes_read(handle),
339 (unsigned long long)handle_bytes_write(handle));
340 } else {
341 logit("%s%sclosedir \"%s\"",
342 emsg == NULL ? "" : emsg, emsg == NULL ? "" : " ",
343 handle_to_name(handle));
344 }
345 }
346
347 static void
348 handle_log_exit(void)
349 {
350 u_int i;
351
352 for (i = 0; i < num_handles; i++)
353 if (handles[i].use != HANDLE_UNUSED)
354 handle_log_close(i, "forced");
355 }
356
357 static int
358 get_handle(void)
359 {
360 char *handle;
361 int val = -1;
362 u_int hlen;
363
364 handle = get_string(&hlen);
365 if (hlen < 256)
366 val = handle_from_string(handle, hlen);
367 xfree(handle);
368 return val;
369 }
370
371 /* send replies */
372
373 static void
374 send_msg(Buffer *m)
375 {
376 int mlen = buffer_len(m);
377
378 buffer_put_int(&oqueue, mlen);
379 buffer_append(&oqueue, buffer_ptr(m), mlen);
380 buffer_consume(m, mlen);
381 }
382
383 static const char *
384 status_to_message(u_int32_t status)
385 {
386 const char *status_messages[] = {
387 "Success", /* SSH_FX_OK */
388 "End of file", /* SSH_FX_EOF */
389 "No such file", /* SSH_FX_NO_SUCH_FILE */
390 "Permission denied", /* SSH_FX_PERMISSION_DENIED */
391 "Failure", /* SSH_FX_FAILURE */
392 "Bad message", /* SSH_FX_BAD_MESSAGE */
393 "No connection", /* SSH_FX_NO_CONNECTION */
394 "Connection lost", /* SSH_FX_CONNECTION_LOST */
395 "Operation unsupported", /* SSH_FX_OP_UNSUPPORTED */
396 "Unknown error" /* Others */
397 };
398 return (status_messages[MIN(status,SSH2_FX_MAX)]);
399 }
400
401 static void
402 send_status(u_int32_t id, u_int32_t status)
403 {
404 Buffer msg;
405
406 debug3("request %u: sent status %u", id, status);
407 if (log_level > SYSLOG_LEVEL_VERBOSE ||
408 (status != SSH2_FX_OK && status != SSH2_FX_EOF))
409 logit("sent status %s", status_to_message(status));
410 buffer_init(&msg);
411 buffer_put_char(&msg, SSH2_FXP_STATUS);
412 buffer_put_int(&msg, id);
413 buffer_put_int(&msg, status);
414 if (version >= 3) {
415 buffer_put_cstring(&msg, status_to_message(status));
416 buffer_put_cstring(&msg, "");
417 }
418 send_msg(&msg);
419 buffer_free(&msg);
420 }
421 static void
422 send_data_or_handle(char type, u_int32_t id, const char *data, int dlen)
423 {
424 Buffer msg;
425
426 buffer_init(&msg);
427 buffer_put_char(&msg, type);
428 buffer_put_int(&msg, id);
429 buffer_put_string(&msg, data, dlen);
430 send_msg(&msg);
431 buffer_free(&msg);
432 }
433
434 static void
435 send_data(u_int32_t id, const char *data, int dlen)
436 {
437 debug("request %u: sent data len %d", id, dlen);
438 send_data_or_handle(SSH2_FXP_DATA, id, data, dlen);
439 }
440
441 static void
442 send_handle(u_int32_t id, int handle)
443 {
444 char *string;
445 int hlen;
446
447 handle_to_string(handle, &string, &hlen);
448 debug("request %u: sent handle handle %d", id, handle);
449 send_data_or_handle(SSH2_FXP_HANDLE, id, string, hlen);
450 xfree(string);
451 }
452
453 static void
454 send_names(u_int32_t id, int count, const Stat *stats)
455 {
456 Buffer msg;
457 int i;
458
459 buffer_init(&msg);
460 buffer_put_char(&msg, SSH2_FXP_NAME);
461 buffer_put_int(&msg, id);
462 buffer_put_int(&msg, count);
463 debug("request %u: sent names count %d", id, count);
464 for (i = 0; i < count; i++) {
465 buffer_put_cstring(&msg, stats[i].name);
466 buffer_put_cstring(&msg, stats[i].long_name);
467 encode_attrib(&msg, &stats[i].attrib);
468 }
469 send_msg(&msg);
470 buffer_free(&msg);
471 }
472
473 static void
474 send_attrib(u_int32_t id, const Attrib *a)
475 {
476 Buffer msg;
477
478 debug("request %u: sent attrib have 0x%x", id, a->flags);
479 buffer_init(&msg);
480 buffer_put_char(&msg, SSH2_FXP_ATTRS);
481 buffer_put_int(&msg, id);
482 encode_attrib(&msg, a);
483 send_msg(&msg);
484 buffer_free(&msg);
485 }
486
487 static void
488 send_statvfs(u_int32_t id, struct statvfs *st)
489 {
490 Buffer msg;
491 u_int64_t flag;
492
493 flag = (st->f_flag & ST_RDONLY) ? SSH2_FXE_STATVFS_ST_RDONLY : 0;
494 flag |= (st->f_flag & ST_NOSUID) ? SSH2_FXE_STATVFS_ST_NOSUID : 0;
495
496 buffer_init(&msg);
497 buffer_put_char(&msg, SSH2_FXP_EXTENDED_REPLY);
498 buffer_put_int(&msg, id);
499 buffer_put_int64(&msg, st->f_bsize);
500 buffer_put_int64(&msg, st->f_frsize);
501 buffer_put_int64(&msg, st->f_blocks);
502 buffer_put_int64(&msg, st->f_bfree);
503 buffer_put_int64(&msg, st->f_bavail);
504 buffer_put_int64(&msg, st->f_files);
505 buffer_put_int64(&msg, st->f_ffree);
506 buffer_put_int64(&msg, st->f_favail);
507 buffer_put_int64(&msg, FSID_TO_ULONG(st->f_fsid));
508 buffer_put_int64(&msg, flag);
509 buffer_put_int64(&msg, st->f_namemax);
510 send_msg(&msg);
511 buffer_free(&msg);
512 }
513
514 /* parse incoming */
515
516 static void
517 process_init(void)
518 {
519 Buffer msg;
520
521 version = get_int();
522 verbose("received client version %d", version);
523 buffer_init(&msg);
524 buffer_put_char(&msg, SSH2_FXP_VERSION);
525 buffer_put_int(&msg, SSH2_FILEXFER_VERSION);
526 /* POSIX rename extension */
527 buffer_put_cstring(&msg, "posix-rename@openssh.com");
528 buffer_put_cstring(&msg, "1"); /* version */
529 /* statvfs extension */
530 buffer_put_cstring(&msg, "statvfs@openssh.com");
531 buffer_put_cstring(&msg, "2"); /* version */
532 /* fstatvfs extension */
533 buffer_put_cstring(&msg, "fstatvfs@openssh.com");
534 buffer_put_cstring(&msg, "2"); /* version */
535 send_msg(&msg);
536 buffer_free(&msg);
537 }
538
539 static void
540 process_open(void)
541 {
542 u_int32_t id, pflags;
543 Attrib *a;
544 char *name;
545 int handle, fd, flags, mode, status = SSH2_FX_FAILURE;
546
547 id = get_int();
548 name = get_string(NULL);
549 pflags = get_int(); /* portable flags */
550 debug3("request %u: open flags %d", id, pflags);
551 a = get_attrib();
552 flags = flags_from_portable(pflags);
553 mode = (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ? a->perm : 0666;
554 logit("open \"%s\" flags %s mode 0%o",
555 name, string_from_portable(pflags), mode);
556 fd = open(name, flags, mode);
557 if (fd < 0) {
558 status = errno_to_portable(errno);
559 } else {
560 handle = handle_new(HANDLE_FILE, name, fd, NULL);
561 if (handle < 0) {
562 close(fd);
563 } else {
564 send_handle(id, handle);
565 status = SSH2_FX_OK;
566 }
567 }
568 if (status != SSH2_FX_OK)
569 send_status(id, status);
570 xfree(name);
571 }
572
573 static void
574 process_close(void)
575 {
576 u_int32_t id;
577 int handle, ret, status = SSH2_FX_FAILURE;
578
579 id = get_int();
580 handle = get_handle();
581 debug3("request %u: close handle %u", id, handle);
582 handle_log_close(handle, NULL);
583 ret = handle_close(handle);
584 status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
585 send_status(id, status);
586 }
587
588 static void
589 process_read(void)
590 {
591 char buf[64*1024];
592 u_int32_t id, len;
593 int handle, fd, ret, status = SSH2_FX_FAILURE;
594 u_int64_t off;
595
596 id = get_int();
597 handle = get_handle();
598 off = get_int64();
599 len = get_int();
600
601 debug("request %u: read \"%s\" (handle %d) off %llu len %d",
602 id, handle_to_name(handle), handle, (unsigned long long)off, len);
603 if (len > sizeof buf) {
604 len = sizeof buf;
605 debug2("read change len %d", len);
606 }
607 fd = handle_to_fd(handle);
608 if (fd >= 0) {
609 if (lseek(fd, off, SEEK_SET) < 0) {
610 error("process_read: seek failed");
611 status = errno_to_portable(errno);
612 } else {
613 ret = read(fd, buf, len);
614 if (ret < 0) {
615 status = errno_to_portable(errno);
616 } else if (ret == 0) {
617 status = SSH2_FX_EOF;
618 } else {
619 send_data(id, buf, ret);
620 status = SSH2_FX_OK;
621 handle_update_read(handle, ret);
622 }
623 }
624 }
625 if (status != SSH2_FX_OK)
626 send_status(id, status);
627 }
628
629 static void
630 process_write(void)
631 {
632 u_int32_t id;
633 u_int64_t off;
634 u_int len;
635 int handle, fd, ret, status = SSH2_FX_FAILURE;
636 char *data;
637
638 id = get_int();
639 handle = get_handle();
640 off = get_int64();
641 data = get_string(&len);
642
643 debug("request %u: write \"%s\" (handle %d) off %llu len %d",
644 id, handle_to_name(handle), handle, (unsigned long long)off, len);
645 fd = handle_to_fd(handle);
646 if (fd >= 0) {
647 if (lseek(fd, off, SEEK_SET) < 0) {
648 status = errno_to_portable(errno);
649 error("process_write: seek failed");
650 } else {
651 /* XXX ATOMICIO ? */
652 ret = write(fd, data, len);
653 if (ret < 0) {
654 error("process_write: write failed");
655 status = errno_to_portable(errno);
656 } else if ((size_t)ret == len) {
657 status = SSH2_FX_OK;
658 handle_update_write(handle, ret);
659 } else {
660 debug2("nothing at all written");
661 }
662 }
663 }
664 send_status(id, status);
665 xfree(data);
666 }
667
668 static void
669 process_do_stat(int do_lstat)
670 {
671 Attrib a;
672 struct stat st;
673 u_int32_t id;
674 char *name;
675 int ret, status = SSH2_FX_FAILURE;
676
677 id = get_int();
678 name = get_string(NULL);
679 debug3("request %u: %sstat", id, do_lstat ? "l" : "");
680 verbose("%sstat name \"%s\"", do_lstat ? "l" : "", name);
681 ret = do_lstat ? lstat(name, &st) : stat(name, &st);
682 if (ret < 0) {
683 status = errno_to_portable(errno);
684 } else {
685 stat_to_attrib(&st, &a);
686 send_attrib(id, &a);
687 status = SSH2_FX_OK;
688 }
689 if (status != SSH2_FX_OK)
690 send_status(id, status);
691 xfree(name);
692 }
693
694 static void
695 process_stat(void)
696 {
697 process_do_stat(0);
698 }
699
700 static void
701 process_lstat(void)
702 {
703 process_do_stat(1);
704 }
705
706 static void
707 process_fstat(void)
708 {
709 Attrib a;
710 struct stat st;
711 u_int32_t id;
712 int fd, ret, handle, status = SSH2_FX_FAILURE;
713
714 id = get_int();
715 handle = get_handle();
716 debug("request %u: fstat \"%s\" (handle %u)",
717 id, handle_to_name(handle), handle);
718 fd = handle_to_fd(handle);
719 if (fd >= 0) {
720 ret = fstat(fd, &st);
721 if (ret < 0) {
722 status = errno_to_portable(errno);
723 } else {
724 stat_to_attrib(&st, &a);
725 send_attrib(id, &a);
726 status = SSH2_FX_OK;
727 }
728 }
729 if (status != SSH2_FX_OK)
730 send_status(id, status);
731 }
732
733 static struct timeval *
734 attrib_to_tv(const Attrib *a)
735 {
736 static struct timeval tv[2];
737
738 tv[0].tv_sec = a->atime;
739 tv[0].tv_usec = 0;
740 tv[1].tv_sec = a->mtime;
741 tv[1].tv_usec = 0;
742 return tv;
743 }
744
745 static void
746 process_setstat(void)
747 {
748 Attrib *a;
749 u_int32_t id;
750 char *name;
751 int status = SSH2_FX_OK, ret;
752
753 id = get_int();
754 name = get_string(NULL);
755 a = get_attrib();
756 debug("request %u: setstat name \"%s\"", id, name);
757 if (a->flags & SSH2_FILEXFER_ATTR_SIZE) {
758 logit("set \"%s\" size %llu",
759 name, (unsigned long long)a->size);
760 ret = truncate(name, a->size);
761 if (ret == -1)
762 status = errno_to_portable(errno);
763 }
764 if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
765 logit("set \"%s\" mode %04o", name, a->perm);
766 ret = chmod(name, a->perm & 07777);
767 if (ret == -1)
768 status = errno_to_portable(errno);
769 }
770 if (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
771 char buf[64];
772 time_t t = a->mtime;
773
774 strftime(buf, sizeof(buf), "%Y%m%d-%H:%M:%S",
775 localtime(&t));
776 logit("set \"%s\" modtime %s", name, buf);
777 ret = utimes(name, attrib_to_tv(a));
778 if (ret == -1)
779 status = errno_to_portable(errno);
780 }
781 if (a->flags & SSH2_FILEXFER_ATTR_UIDGID) {
782 logit("set \"%s\" owner %lu group %lu", name,
783 (u_long)a->uid, (u_long)a->gid);
784 ret = chown(name, a->uid, a->gid);
785 if (ret == -1)
786 status = errno_to_portable(errno);
787 }
788 send_status(id, status);
789 xfree(name);
790 }
791
792 static void
793 process_fsetstat(void)
794 {
795 Attrib *a;
796 u_int32_t id;
797 int handle, fd, ret;
798 int status = SSH2_FX_OK;
799
800 id = get_int();
801 handle = get_handle();
802 a = get_attrib();
803 debug("request %u: fsetstat handle %d", id, handle);
804 fd = handle_to_fd(handle);
805 if (fd < 0) {
806 status = SSH2_FX_FAILURE;
807 } else {
808 char *name = handle_to_name(handle);
809
810 if (a->flags & SSH2_FILEXFER_ATTR_SIZE) {
811 logit("set \"%s\" size %llu",
812 name, (unsigned long long)a->size);
813 ret = ftruncate(fd, a->size);
814 if (ret == -1)
815 status = errno_to_portable(errno);
816 }
817 if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
818 logit("set \"%s\" mode %04o", name, a->perm);
819 #ifdef HAVE_FCHMOD
820 ret = fchmod(fd, a->perm & 07777);
821 #else
822 ret = chmod(name, a->perm & 07777);
823 #endif
824 if (ret == -1)
825 status = errno_to_portable(errno);
826 }
827 if (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
828 char buf[64];
829 time_t t = a->mtime;
830
831 strftime(buf, sizeof(buf), "%Y%m%d-%H:%M:%S",
832 localtime(&t));
833 logit("set \"%s\" modtime %s", name, buf);
834 #ifdef HAVE_FUTIMES
835 ret = futimes(fd, attrib_to_tv(a));
836 #else
837 ret = utimes(name, attrib_to_tv(a));
838 #endif
839 if (ret == -1)
840 status = errno_to_portable(errno);
841 }
842 if (a->flags & SSH2_FILEXFER_ATTR_UIDGID) {
843 logit("set \"%s\" owner %lu group %lu", name,
844 (u_long)a->uid, (u_long)a->gid);
845 #ifdef HAVE_FCHOWN
846 ret = fchown(fd, a->uid, a->gid);
847 #else
848 ret = chown(name, a->uid, a->gid);
849 #endif
850 if (ret == -1)
851 status = errno_to_portable(errno);
852 }
853 }
854 send_status(id, status);
855 }
856
857 static void
858 process_opendir(void)
859 {
860 DIR *dirp = NULL;
861 char *path;
862 int handle, status = SSH2_FX_FAILURE;
863 u_int32_t id;
864
865 id = get_int();
866 path = get_string(NULL);
867 debug3("request %u: opendir", id);
868 logit("opendir \"%s\"", path);
869 dirp = opendir(path);
870 if (dirp == NULL) {
871 status = errno_to_portable(errno);
872 } else {
873 handle = handle_new(HANDLE_DIR, path, 0, dirp);
874 if (handle < 0) {
875 closedir(dirp);
876 } else {
877 send_handle(id, handle);
878 status = SSH2_FX_OK;
879 }
880
881 }
882 if (status != SSH2_FX_OK)
883 send_status(id, status);
884 xfree(path);
885 }
886
887 static void
888 process_readdir(void)
889 {
890 DIR *dirp;
891 struct dirent *dp;
892 char *path;
893 int handle;
894 u_int32_t id;
895
896 id = get_int();
897 handle = get_handle();
898 debug("request %u: readdir \"%s\" (handle %d)", id,
899 handle_to_name(handle), handle);
900 dirp = handle_to_dir(handle);
901 path = handle_to_name(handle);
902 if (dirp == NULL || path == NULL) {
903 send_status(id, SSH2_FX_FAILURE);
904 } else {
905 struct stat st;
906 char pathname[MAXPATHLEN];
907 Stat *stats;
908 int nstats = 10, count = 0, i;
909
910 stats = xcalloc(nstats, sizeof(Stat));
911 while ((dp = readdir(dirp)) != NULL) {
912 if (count >= nstats) {
913 nstats *= 2;
914 stats = xrealloc(stats, nstats, sizeof(Stat));
915 }
916 /* XXX OVERFLOW ? */
917 snprintf(pathname, sizeof pathname, "%s%s%s", path,
918 strcmp(path, "/") ? "/" : "", dp->d_name);
919 if (lstat(pathname, &st) < 0)
920 continue;
921 stat_to_attrib(&st, &(stats[count].attrib));
922 stats[count].name = xstrdup(dp->d_name);
923 stats[count].long_name = ls_file(dp->d_name, &st, 0);
924 count++;
925 /* send up to 100 entries in one message */
926 /* XXX check packet size instead */
927 if (count == 100)
928 break;
929 }
930 if (count > 0) {
931 send_names(id, count, stats);
932 for (i = 0; i < count; i++) {
933 xfree(stats[i].name);
934 xfree(stats[i].long_name);
935 }
936 } else {
937 send_status(id, SSH2_FX_EOF);
938 }
939 xfree(stats);
940 }
941 }
942
943 static void
944 process_remove(void)
945 {
946 char *name;
947 u_int32_t id;
948 int status = SSH2_FX_FAILURE;
949 int ret;
950
951 id = get_int();
952 name = get_string(NULL);
953 debug3("request %u: remove", id);
954 logit("remove name \"%s\"", name);
955 ret = unlink(name);
956 status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
957 send_status(id, status);
958 xfree(name);
959 }
960
961 static void
962 process_mkdir(void)
963 {
964 Attrib *a;
965 u_int32_t id;
966 char *name;
967 int ret, mode, status = SSH2_FX_FAILURE;
968
969 id = get_int();
970 name = get_string(NULL);
971 a = get_attrib();
972 mode = (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ?
973 a->perm & 07777 : 0777;
974 debug3("request %u: mkdir", id);
975 logit("mkdir name \"%s\" mode 0%o", name, mode);
976 ret = mkdir(name, mode);
977 status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
978 send_status(id, status);
979 xfree(name);
980 }
981
982 static void
983 process_rmdir(void)
984 {
985 u_int32_t id;
986 char *name;
987 int ret, status;
988
989 id = get_int();
990 name = get_string(NULL);
991 debug3("request %u: rmdir", id);
992 logit("rmdir name \"%s\"", name);
993 ret = rmdir(name);
994 status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
995 send_status(id, status);
996 xfree(name);
997 }
998
999 static void
1000 process_realpath(void)
1001 {
1002 char resolvedname[MAXPATHLEN];
1003 u_int32_t id;
1004 char *path;
1005
1006 id = get_int();
1007 path = get_string(NULL);
1008 if (path[0] == '\0') {
1009 xfree(path);
1010 path = xstrdup(".");
1011 }
1012 debug3("request %u: realpath", id);
1013 verbose("realpath \"%s\"", path);
1014 if (realpath(path, resolvedname) == NULL) {
1015 send_status(id, errno_to_portable(errno));
1016 } else {
1017 Stat s;
1018 attrib_clear(&s.attrib);
1019 s.name = s.long_name = resolvedname;
1020 send_names(id, 1, &s);
1021 }
1022 xfree(path);
1023 }
1024
1025 static void
1026 process_rename(void)
1027 {
1028 u_int32_t id;
1029 char *oldpath, *newpath;
1030 int status;
1031 struct stat sb;
1032
1033 id = get_int();
1034 oldpath = get_string(NULL);
1035 newpath = get_string(NULL);
1036 debug3("request %u: rename", id);
1037 logit("rename old \"%s\" new \"%s\"", oldpath, newpath);
1038 status = SSH2_FX_FAILURE;
1039 if (lstat(oldpath, &sb) == -1)
1040 status = errno_to_portable(errno);
1041 else if (S_ISREG(sb.st_mode)) {
1042 /* Race-free rename of regular files */
1043 if (link(oldpath, newpath) == -1) {
1044 if (errno == EOPNOTSUPP
1045 #ifdef EXDEV
1046 || errno == EXDEV
1047 #endif
1048 #ifdef LINK_OPNOTSUPP_ERRNO
1049 || errno == LINK_OPNOTSUPP_ERRNO
1050 #endif
1051 ) {
1052 struct stat st;
1053
1054 /*
1055 * fs doesn't support links, so fall back to
1056 * stat+rename. This is racy.
1057 */
1058 if (stat(newpath, &st) == -1) {
1059 if (rename(oldpath, newpath) == -1)
1060 status =
1061 errno_to_portable(errno);
1062 else
1063 status = SSH2_FX_OK;
1064 }
1065 } else {
1066 status = errno_to_portable(errno);
1067 }
1068 } else if (unlink(oldpath) == -1) {
1069 status = errno_to_portable(errno);
1070 /* clean spare link */
1071 unlink(newpath);
1072 } else
1073 status = SSH2_FX_OK;
1074 } else if (stat(newpath, &sb) == -1) {
1075 if (rename(oldpath, newpath) == -1)
1076 status = errno_to_portable(errno);
1077 else
1078 status = SSH2_FX_OK;
1079 }
1080 send_status(id, status);
1081 xfree(oldpath);
1082 xfree(newpath);
1083 }
1084
1085 static void
1086 process_readlink(void)
1087 {
1088 u_int32_t id;
1089 int len;
1090 char buf[MAXPATHLEN];
1091 char *path;
1092
1093 id = get_int();
1094 path = get_string(NULL);
1095 debug3("request %u: readlink", id);
1096 verbose("readlink \"%s\"", path);
1097 if ((len = readlink(path, buf, sizeof(buf) - 1)) == -1)
1098 send_status(id, errno_to_portable(errno));
1099 else {
1100 Stat s;
1101
1102 buf[len] = '\0';
1103 attrib_clear(&s.attrib);
1104 s.name = s.long_name = buf;
1105 send_names(id, 1, &s);
1106 }
1107 xfree(path);
1108 }
1109
1110 static void
1111 process_symlink(void)
1112 {
1113 u_int32_t id;
1114 char *oldpath, *newpath;
1115 int ret, status;
1116
1117 id = get_int();
1118 oldpath = get_string(NULL);
1119 newpath = get_string(NULL);
1120 debug3("request %u: symlink", id);
1121 logit("symlink old \"%s\" new \"%s\"", oldpath, newpath);
1122 /* this will fail if 'newpath' exists */
1123 ret = symlink(oldpath, newpath);
1124 status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1125 send_status(id, status);
1126 xfree(oldpath);
1127 xfree(newpath);
1128 }
1129
1130 static void
1131 process_extended_posix_rename(u_int32_t id)
1132 {
1133 char *oldpath, *newpath;
1134
1135 oldpath = get_string(NULL);
1136 newpath = get_string(NULL);
1137 debug3("request %u: posix-rename", id);
1138 logit("posix-rename old \"%s\" new \"%s\"", oldpath, newpath);
1139 if (rename(oldpath, newpath) == -1)
1140 send_status(id, errno_to_portable(errno));
1141 else
1142 send_status(id, SSH2_FX_OK);
1143 xfree(oldpath);
1144 xfree(newpath);
1145 }
1146
1147 static void
1148 process_extended_statvfs(u_int32_t id)
1149 {
1150 char *path;
1151 struct statvfs st;
1152
1153 path = get_string(NULL);
1154 debug3("request %u: statfs", id);
1155 logit("statfs \"%s\"", path);
1156
1157 if (statvfs(path, &st) != 0)
1158 send_status(id, errno_to_portable(errno));
1159 else
1160 send_statvfs(id, &st);
1161 xfree(path);
1162 }
1163
1164 static void
1165 process_extended_fstatvfs(u_int32_t id)
1166 {
1167 int handle, fd;
1168 struct statvfs st;
1169
1170 handle = get_handle();
1171 debug("request %u: fstatvfs \"%s\" (handle %u)",
1172 id, handle_to_name(handle), handle);
1173 if ((fd = handle_to_fd(handle)) < 0) {
1174 send_status(id, SSH2_FX_FAILURE);
1175 return;
1176 }
1177 if (fstatvfs(fd, &st) != 0)
1178 send_status(id, errno_to_portable(errno));
1179 else
1180 send_statvfs(id, &st);
1181 }
1182
1183 static void
1184 process_extended(void)
1185 {
1186 u_int32_t id;
1187 char *request;
1188
1189 id = get_int();
1190 request = get_string(NULL);
1191 if (strcmp(request, "posix-rename@openssh.com") == 0)
1192 process_extended_posix_rename(id);
1193 else if (strcmp(request, "statvfs@openssh.com") == 0)
1194 process_extended_statvfs(id);
1195 else if (strcmp(request, "fstatvfs@openssh.com") == 0)
1196 process_extended_fstatvfs(id);
1197 else
1198 send_status(id, SSH2_FX_OP_UNSUPPORTED); /* MUST */
1199 xfree(request);
1200 }
1201
1202 /* stolen from ssh-agent */
1203
1204 static void
1205 process(void)
1206 {
1207 u_int msg_len;
1208 u_int buf_len;
1209 u_int consumed;
1210 u_int type;
1211 u_char *cp;
1212
1213 buf_len = buffer_len(&iqueue);
1214 if (buf_len < 5)
1215 return; /* Incomplete message. */
1216 cp = buffer_ptr(&iqueue);
1217 msg_len = get_u32(cp);
1218 if (msg_len > SFTP_MAX_MSG_LENGTH) {
1219 error("bad message from %s local user %s",
1220 client_addr, pw->pw_name);
1221 sftp_server_cleanup_exit(11);
1222 }
1223 if (buf_len < msg_len + 4)
1224 return;
1225 buffer_consume(&iqueue, 4);
1226 buf_len -= 4;
1227 type = buffer_get_char(&iqueue);
1228 switch (type) {
1229 case SSH2_FXP_INIT:
1230 process_init();
1231 break;
1232 case SSH2_FXP_OPEN:
1233 process_open();
1234 break;
1235 case SSH2_FXP_CLOSE:
1236 process_close();
1237 break;
1238 case SSH2_FXP_READ:
1239 process_read();
1240 break;
1241 case SSH2_FXP_WRITE:
1242 process_write();
1243 break;
1244 case SSH2_FXP_LSTAT:
1245 process_lstat();
1246 break;
1247 case SSH2_FXP_FSTAT:
1248 process_fstat();
1249 break;
1250 case SSH2_FXP_SETSTAT:
1251 process_setstat();
1252 break;
1253 case SSH2_FXP_FSETSTAT:
1254 process_fsetstat();
1255 break;
1256 case SSH2_FXP_OPENDIR:
1257 process_opendir();
1258 break;
1259 case SSH2_FXP_READDIR:
1260 process_readdir();
1261 break;
1262 case SSH2_FXP_REMOVE:
1263 process_remove();
1264 break;
1265 case SSH2_FXP_MKDIR:
1266 process_mkdir();
1267 break;
1268 case SSH2_FXP_RMDIR:
1269 process_rmdir();
1270 break;
1271 case SSH2_FXP_REALPATH:
1272 process_realpath();
1273 break;
1274 case SSH2_FXP_STAT:
1275 process_stat();
1276 break;
1277 case SSH2_FXP_RENAME:
1278 process_rename();
1279 break;
1280 case SSH2_FXP_READLINK:
1281 process_readlink();
1282 break;
1283 case SSH2_FXP_SYMLINK:
1284 process_symlink();
1285 break;
1286 case SSH2_FXP_EXTENDED:
1287 process_extended();
1288 break;
1289 default:
1290 error("Unknown message %d", type);
1291 break;
1292 }
1293 /* discard the remaining bytes from the current packet */
1294 if (buf_len < buffer_len(&iqueue)) {
1295 error("iqueue grew unexpectedly");
1296 sftp_server_cleanup_exit(255);
1297 }
1298 consumed = buf_len - buffer_len(&iqueue);
1299 if (msg_len < consumed) {
1300 error("msg_len %d < consumed %d", msg_len, consumed);
1301 sftp_server_cleanup_exit(255);
1302 }
1303 if (msg_len > consumed)
1304 buffer_consume(&iqueue, msg_len - consumed);
1305 }
1306
1307 /* Cleanup handler that logs active handles upon normal exit */
1308 void
1309 sftp_server_cleanup_exit(int i)
1310 {
1311 if (pw != NULL && client_addr != NULL) {
1312 handle_log_exit();
1313 logit("session closed for local user %s from [%s]",
1314 pw->pw_name, client_addr);
1315 }
1316 _exit(i);
1317 }
1318
1319 static void
1320 sftp_server_usage(void)
1321 {
1322 extern char *__progname;
1323
1324 fprintf(stderr,
1325 "usage: %s [-he] [-l log_level] [-f log_facility]\n", __progname);
1326 exit(1);
1327 }
1328
1329 int
1330 sftp_server_main(int argc, char **argv, struct passwd *user_pw)
1331 {
1332 fd_set *rset, *wset;
1333 int in, out, max, ch, skipargs = 0, log_stderr = 0;
1334 ssize_t len, olen, set_size;
1335 SyslogFacility log_facility = SYSLOG_FACILITY_AUTH;
1336 char *cp, buf[4*4096];
1337
1338 extern char *optarg;
1339 extern char *__progname;
1340
1341 __progname = ssh_get_progname(argv[0]);
1342 log_init(__progname, log_level, log_facility, log_stderr);
1343
1344 while (!skipargs && (ch = getopt(argc, argv, "C:f:l:che")) != -1) {
1345 switch (ch) {
1346 case 'c':
1347 /*
1348 * Ignore all arguments if we are invoked as a
1349 * shell using "sftp-server -c command"
1350 */
1351 skipargs = 1;
1352 break;
1353 case 'e':
1354 log_stderr = 1;
1355 break;
1356 case 'l':
1357 log_level = log_level_number(optarg);
1358 if (log_level == SYSLOG_LEVEL_NOT_SET)
1359 error("Invalid log level \"%s\"", optarg);
1360 break;
1361 case 'f':
1362 log_facility = log_facility_number(optarg);
1363 if (log_facility == SYSLOG_FACILITY_NOT_SET)
1364 error("Invalid log facility \"%s\"", optarg);
1365 break;
1366 case 'h':
1367 default:
1368 sftp_server_usage();
1369 }
1370 }
1371
1372 log_init(__progname, log_level, log_facility, log_stderr);
1373
1374 if ((cp = getenv("SSH_CONNECTION")) != NULL) {
1375 client_addr = xstrdup(cp);
1376 if ((cp = strchr(client_addr, ' ')) == NULL) {
1377 error("Malformed SSH_CONNECTION variable: \"%s\"",
1378 getenv("SSH_CONNECTION"));
1379 sftp_server_cleanup_exit(255);
1380 }
1381 *cp = '\0';
1382 } else
1383 client_addr = xstrdup("UNKNOWN");
1384
1385 pw = pwcopy(user_pw);
1386
1387 logit("session opened for local user %s from [%s]",
1388 pw->pw_name, client_addr);
1389
1390 in = dup(STDIN_FILENO);
1391 out = dup(STDOUT_FILENO);
1392
1393 #ifdef HAVE_CYGWIN
1394 setmode(in, O_BINARY);
1395 setmode(out, O_BINARY);
1396 #endif
1397
1398 max = 0;
1399 if (in > max)
1400 max = in;
1401 if (out > max)
1402 max = out;
1403
1404 buffer_init(&iqueue);
1405 buffer_init(&oqueue);
1406
1407 set_size = howmany(max + 1, NFDBITS) * sizeof(fd_mask);
1408 rset = (fd_set *)xmalloc(set_size);
1409 wset = (fd_set *)xmalloc(set_size);
1410
1411 for (;;) {
1412 memset(rset, 0, set_size);
1413 memset(wset, 0, set_size);
1414
1415 /*
1416 * Ensure that we can read a full buffer and handle
1417 * the worst-case length packet it can generate,
1418 * otherwise apply backpressure by stopping reads.
1419 */
1420 if (buffer_check_alloc(&iqueue, sizeof(buf)) &&
1421 buffer_check_alloc(&oqueue, SFTP_MAX_MSG_LENGTH))
1422 FD_SET(in, rset);
1423
1424 olen = buffer_len(&oqueue);
1425 if (olen > 0)
1426 FD_SET(out, wset);
1427
1428 if (select(max+1, rset, wset, NULL, NULL) < 0) {
1429 if (errno == EINTR)
1430 continue;
1431 error("select: %s", strerror(errno));
1432 sftp_server_cleanup_exit(2);
1433 }
1434
1435 /* copy stdin to iqueue */
1436 if (FD_ISSET(in, rset)) {
1437 len = read(in, buf, sizeof buf);
1438 if (len == 0) {
1439 debug("read eof");
1440 sftp_server_cleanup_exit(0);
1441 } else if (len < 0) {
1442 error("read: %s", strerror(errno));
1443 sftp_server_cleanup_exit(1);
1444 } else {
1445 buffer_append(&iqueue, buf, len);
1446 }
1447 }
1448 /* send oqueue to stdout */
1449 if (FD_ISSET(out, wset)) {
1450 len = write(out, buffer_ptr(&oqueue), olen);
1451 if (len < 0) {
1452 error("write: %s", strerror(errno));
1453 sftp_server_cleanup_exit(1);
1454 } else {
1455 buffer_consume(&oqueue, len);
1456 }
1457 }
1458
1459 /*
1460 * Process requests from client if we can fit the results
1461 * into the output buffer, otherwise stop processing input
1462 * and let the output queue drain.
1463 */
1464 if (buffer_check_alloc(&oqueue, SFTP_MAX_MSG_LENGTH))
1465 process();
1466 }
1467 }
DragonFly BSD