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1 | /* | |
2 | * Copyright (c) 2000, 2001, 2002 Markus Friedl. All rights reserved. | |
3 | * | |
4 | * Redistribution and use in source and binary forms, with or without | |
5 | * modification, are permitted provided that the following conditions | |
6 | * are met: | |
7 | * 1. Redistributions of source code must retain the above copyright | |
8 | * notice, this list of conditions and the following disclaimer. | |
9 | * 2. Redistributions in binary form must reproduce the above copyright | |
10 | * notice, this list of conditions and the following disclaimer in the | |
11 | * documentation and/or other materials provided with the distribution. | |
12 | * | |
13 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
14 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
15 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
16 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
17 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
18 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
19 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
20 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
21 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
22 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
23 | */ | |
24 | #include "includes.h" | |
25 | RCSID("$OpenBSD: sftp-server.c,v 1.41 2003/03/26 04:02:51 deraadt Exp $"); | |
26 | ||
27 | #include "buffer.h" | |
28 | #include "bufaux.h" | |
29 | #include "getput.h" | |
30 | #include "log.h" | |
31 | #include "xmalloc.h" | |
32 | ||
33 | #include "sftp.h" | |
34 | #include "sftp-common.h" | |
35 | ||
36 | /* helper */ | |
37 | #define get_int64() buffer_get_int64(&iqueue); | |
38 | #define get_int() buffer_get_int(&iqueue); | |
39 | #define get_string(lenp) buffer_get_string(&iqueue, lenp); | |
40 | #define TRACE debug | |
41 | ||
42 | #ifdef HAVE___PROGNAME | |
43 | extern char *__progname; | |
44 | #else | |
45 | char *__progname; | |
46 | #endif | |
47 | ||
48 | /* input and output queue */ | |
49 | Buffer iqueue; | |
50 | Buffer oqueue; | |
51 | ||
52 | /* Version of client */ | |
53 | int version; | |
54 | ||
55 | /* portable attibutes, etc. */ | |
56 | ||
57 | typedef struct Stat Stat; | |
58 | ||
59 | struct Stat { | |
60 | char *name; | |
61 | char *long_name; | |
62 | Attrib attrib; | |
63 | }; | |
64 | ||
65 | static int | |
66 | errno_to_portable(int unixerrno) | |
67 | { | |
68 | int ret = 0; | |
69 | ||
70 | switch (unixerrno) { | |
71 | case 0: | |
72 | ret = SSH2_FX_OK; | |
73 | break; | |
74 | case ENOENT: | |
75 | case ENOTDIR: | |
76 | case EBADF: | |
77 | case ELOOP: | |
78 | ret = SSH2_FX_NO_SUCH_FILE; | |
79 | break; | |
80 | case EPERM: | |
81 | case EACCES: | |
82 | case EFAULT: | |
83 | ret = SSH2_FX_PERMISSION_DENIED; | |
84 | break; | |
85 | case ENAMETOOLONG: | |
86 | case EINVAL: | |
87 | ret = SSH2_FX_BAD_MESSAGE; | |
88 | break; | |
89 | default: | |
90 | ret = SSH2_FX_FAILURE; | |
91 | break; | |
92 | } | |
93 | return ret; | |
94 | } | |
95 | ||
96 | static int | |
97 | flags_from_portable(int pflags) | |
98 | { | |
99 | int flags = 0; | |
100 | ||
101 | if ((pflags & SSH2_FXF_READ) && | |
102 | (pflags & SSH2_FXF_WRITE)) { | |
103 | flags = O_RDWR; | |
104 | } else if (pflags & SSH2_FXF_READ) { | |
105 | flags = O_RDONLY; | |
106 | } else if (pflags & SSH2_FXF_WRITE) { | |
107 | flags = O_WRONLY; | |
108 | } | |
109 | if (pflags & SSH2_FXF_CREAT) | |
110 | flags |= O_CREAT; | |
111 | if (pflags & SSH2_FXF_TRUNC) | |
112 | flags |= O_TRUNC; | |
113 | if (pflags & SSH2_FXF_EXCL) | |
114 | flags |= O_EXCL; | |
115 | return flags; | |
116 | } | |
117 | ||
118 | static Attrib * | |
119 | get_attrib(void) | |
120 | { | |
121 | return decode_attrib(&iqueue); | |
122 | } | |
123 | ||
124 | /* handle handles */ | |
125 | ||
126 | typedef struct Handle Handle; | |
127 | struct Handle { | |
128 | int use; | |
129 | DIR *dirp; | |
130 | int fd; | |
131 | char *name; | |
132 | }; | |
133 | ||
134 | enum { | |
135 | HANDLE_UNUSED, | |
136 | HANDLE_DIR, | |
137 | HANDLE_FILE | |
138 | }; | |
139 | ||
140 | Handle handles[100]; | |
141 | ||
142 | static void | |
143 | handle_init(void) | |
144 | { | |
145 | int i; | |
146 | ||
147 | for (i = 0; i < sizeof(handles)/sizeof(Handle); i++) | |
148 | handles[i].use = HANDLE_UNUSED; | |
149 | } | |
150 | ||
151 | static int | |
152 | handle_new(int use, char *name, int fd, DIR *dirp) | |
153 | { | |
154 | int i; | |
155 | ||
156 | for (i = 0; i < sizeof(handles)/sizeof(Handle); i++) { | |
157 | if (handles[i].use == HANDLE_UNUSED) { | |
158 | handles[i].use = use; | |
159 | handles[i].dirp = dirp; | |
160 | handles[i].fd = fd; | |
161 | handles[i].name = xstrdup(name); | |
162 | return i; | |
163 | } | |
164 | } | |
165 | return -1; | |
166 | } | |
167 | ||
168 | static int | |
169 | handle_is_ok(int i, int type) | |
170 | { | |
171 | return i >= 0 && i < sizeof(handles)/sizeof(Handle) && | |
172 | handles[i].use == type; | |
173 | } | |
174 | ||
175 | static int | |
176 | handle_to_string(int handle, char **stringp, int *hlenp) | |
177 | { | |
178 | if (stringp == NULL || hlenp == NULL) | |
179 | return -1; | |
180 | *stringp = xmalloc(sizeof(int32_t)); | |
181 | PUT_32BIT(*stringp, handle); | |
182 | *hlenp = sizeof(int32_t); | |
183 | return 0; | |
184 | } | |
185 | ||
186 | static int | |
187 | handle_from_string(char *handle, u_int hlen) | |
188 | { | |
189 | int val; | |
190 | ||
191 | if (hlen != sizeof(int32_t)) | |
192 | return -1; | |
193 | val = GET_32BIT(handle); | |
194 | if (handle_is_ok(val, HANDLE_FILE) || | |
195 | handle_is_ok(val, HANDLE_DIR)) | |
196 | return val; | |
197 | return -1; | |
198 | } | |
199 | ||
200 | static char * | |
201 | handle_to_name(int handle) | |
202 | { | |
203 | if (handle_is_ok(handle, HANDLE_DIR)|| | |
204 | handle_is_ok(handle, HANDLE_FILE)) | |
205 | return handles[handle].name; | |
206 | return NULL; | |
207 | } | |
208 | ||
209 | static DIR * | |
210 | handle_to_dir(int handle) | |
211 | { | |
212 | if (handle_is_ok(handle, HANDLE_DIR)) | |
213 | return handles[handle].dirp; | |
214 | return NULL; | |
215 | } | |
216 | ||
217 | static int | |
218 | handle_to_fd(int handle) | |
219 | { | |
220 | if (handle_is_ok(handle, HANDLE_FILE)) | |
221 | return handles[handle].fd; | |
222 | return -1; | |
223 | } | |
224 | ||
225 | static int | |
226 | handle_close(int handle) | |
227 | { | |
228 | int ret = -1; | |
229 | ||
230 | if (handle_is_ok(handle, HANDLE_FILE)) { | |
231 | ret = close(handles[handle].fd); | |
232 | handles[handle].use = HANDLE_UNUSED; | |
233 | xfree(handles[handle].name); | |
234 | } else if (handle_is_ok(handle, HANDLE_DIR)) { | |
235 | ret = closedir(handles[handle].dirp); | |
236 | handles[handle].use = HANDLE_UNUSED; | |
237 | xfree(handles[handle].name); | |
238 | } else { | |
239 | errno = ENOENT; | |
240 | } | |
241 | return ret; | |
242 | } | |
243 | ||
244 | static int | |
245 | get_handle(void) | |
246 | { | |
247 | char *handle; | |
248 | int val = -1; | |
249 | u_int hlen; | |
250 | ||
251 | handle = get_string(&hlen); | |
252 | if (hlen < 256) | |
253 | val = handle_from_string(handle, hlen); | |
254 | xfree(handle); | |
255 | return val; | |
256 | } | |
257 | ||
258 | /* send replies */ | |
259 | ||
260 | static void | |
261 | send_msg(Buffer *m) | |
262 | { | |
263 | int mlen = buffer_len(m); | |
264 | ||
265 | buffer_put_int(&oqueue, mlen); | |
266 | buffer_append(&oqueue, buffer_ptr(m), mlen); | |
267 | buffer_consume(m, mlen); | |
268 | } | |
269 | ||
270 | static void | |
271 | send_status(u_int32_t id, u_int32_t error) | |
272 | { | |
273 | Buffer msg; | |
274 | const char *status_messages[] = { | |
275 | "Success", /* SSH_FX_OK */ | |
276 | "End of file", /* SSH_FX_EOF */ | |
277 | "No such file", /* SSH_FX_NO_SUCH_FILE */ | |
278 | "Permission denied", /* SSH_FX_PERMISSION_DENIED */ | |
279 | "Failure", /* SSH_FX_FAILURE */ | |
280 | "Bad message", /* SSH_FX_BAD_MESSAGE */ | |
281 | "No connection", /* SSH_FX_NO_CONNECTION */ | |
282 | "Connection lost", /* SSH_FX_CONNECTION_LOST */ | |
283 | "Operation unsupported", /* SSH_FX_OP_UNSUPPORTED */ | |
284 | "Unknown error" /* Others */ | |
285 | }; | |
286 | ||
287 | TRACE("sent status id %u error %u", id, error); | |
288 | buffer_init(&msg); | |
289 | buffer_put_char(&msg, SSH2_FXP_STATUS); | |
290 | buffer_put_int(&msg, id); | |
291 | buffer_put_int(&msg, error); | |
292 | if (version >= 3) { | |
293 | buffer_put_cstring(&msg, | |
294 | status_messages[MIN(error,SSH2_FX_MAX)]); | |
295 | buffer_put_cstring(&msg, ""); | |
296 | } | |
297 | send_msg(&msg); | |
298 | buffer_free(&msg); | |
299 | } | |
300 | static void | |
301 | send_data_or_handle(char type, u_int32_t id, char *data, int dlen) | |
302 | { | |
303 | Buffer msg; | |
304 | ||
305 | buffer_init(&msg); | |
306 | buffer_put_char(&msg, type); | |
307 | buffer_put_int(&msg, id); | |
308 | buffer_put_string(&msg, data, dlen); | |
309 | send_msg(&msg); | |
310 | buffer_free(&msg); | |
311 | } | |
312 | ||
313 | static void | |
314 | send_data(u_int32_t id, char *data, int dlen) | |
315 | { | |
316 | TRACE("sent data id %u len %d", id, dlen); | |
317 | send_data_or_handle(SSH2_FXP_DATA, id, data, dlen); | |
318 | } | |
319 | ||
320 | static void | |
321 | send_handle(u_int32_t id, int handle) | |
322 | { | |
323 | char *string; | |
324 | int hlen; | |
325 | ||
326 | handle_to_string(handle, &string, &hlen); | |
327 | TRACE("sent handle id %u handle %d", id, handle); | |
328 | send_data_or_handle(SSH2_FXP_HANDLE, id, string, hlen); | |
329 | xfree(string); | |
330 | } | |
331 | ||
332 | static void | |
333 | send_names(u_int32_t id, int count, Stat *stats) | |
334 | { | |
335 | Buffer msg; | |
336 | int i; | |
337 | ||
338 | buffer_init(&msg); | |
339 | buffer_put_char(&msg, SSH2_FXP_NAME); | |
340 | buffer_put_int(&msg, id); | |
341 | buffer_put_int(&msg, count); | |
342 | TRACE("sent names id %u count %d", id, count); | |
343 | for (i = 0; i < count; i++) { | |
344 | buffer_put_cstring(&msg, stats[i].name); | |
345 | buffer_put_cstring(&msg, stats[i].long_name); | |
346 | encode_attrib(&msg, &stats[i].attrib); | |
347 | } | |
348 | send_msg(&msg); | |
349 | buffer_free(&msg); | |
350 | } | |
351 | ||
352 | static void | |
353 | send_attrib(u_int32_t id, Attrib *a) | |
354 | { | |
355 | Buffer msg; | |
356 | ||
357 | TRACE("sent attrib id %u have 0x%x", id, a->flags); | |
358 | buffer_init(&msg); | |
359 | buffer_put_char(&msg, SSH2_FXP_ATTRS); | |
360 | buffer_put_int(&msg, id); | |
361 | encode_attrib(&msg, a); | |
362 | send_msg(&msg); | |
363 | buffer_free(&msg); | |
364 | } | |
365 | ||
366 | /* parse incoming */ | |
367 | ||
368 | static void | |
369 | process_init(void) | |
370 | { | |
371 | Buffer msg; | |
372 | ||
373 | version = get_int(); | |
374 | TRACE("client version %d", version); | |
375 | buffer_init(&msg); | |
376 | buffer_put_char(&msg, SSH2_FXP_VERSION); | |
377 | buffer_put_int(&msg, SSH2_FILEXFER_VERSION); | |
378 | send_msg(&msg); | |
379 | buffer_free(&msg); | |
380 | } | |
381 | ||
382 | static void | |
383 | process_open(void) | |
384 | { | |
385 | u_int32_t id, pflags; | |
386 | Attrib *a; | |
387 | char *name; | |
388 | int handle, fd, flags, mode, status = SSH2_FX_FAILURE; | |
389 | ||
390 | id = get_int(); | |
391 | name = get_string(NULL); | |
392 | pflags = get_int(); /* portable flags */ | |
393 | a = get_attrib(); | |
394 | flags = flags_from_portable(pflags); | |
395 | mode = (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ? a->perm : 0666; | |
396 | TRACE("open id %u name %s flags %d mode 0%o", id, name, pflags, mode); | |
397 | fd = open(name, flags, mode); | |
398 | if (fd < 0) { | |
399 | status = errno_to_portable(errno); | |
400 | } else { | |
401 | handle = handle_new(HANDLE_FILE, name, fd, NULL); | |
402 | if (handle < 0) { | |
403 | close(fd); | |
404 | } else { | |
405 | send_handle(id, handle); | |
406 | status = SSH2_FX_OK; | |
407 | } | |
408 | } | |
409 | if (status != SSH2_FX_OK) | |
410 | send_status(id, status); | |
411 | xfree(name); | |
412 | } | |
413 | ||
414 | static void | |
415 | process_close(void) | |
416 | { | |
417 | u_int32_t id; | |
418 | int handle, ret, status = SSH2_FX_FAILURE; | |
419 | ||
420 | id = get_int(); | |
421 | handle = get_handle(); | |
422 | TRACE("close id %u handle %d", id, handle); | |
423 | ret = handle_close(handle); | |
424 | status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK; | |
425 | send_status(id, status); | |
426 | } | |
427 | ||
428 | static void | |
429 | process_read(void) | |
430 | { | |
431 | char buf[64*1024]; | |
432 | u_int32_t id, len; | |
433 | int handle, fd, ret, status = SSH2_FX_FAILURE; | |
434 | u_int64_t off; | |
435 | ||
436 | id = get_int(); | |
437 | handle = get_handle(); | |
438 | off = get_int64(); | |
439 | len = get_int(); | |
440 | ||
441 | TRACE("read id %u handle %d off %llu len %d", id, handle, | |
442 | (u_int64_t)off, len); | |
443 | if (len > sizeof buf) { | |
444 | len = sizeof buf; | |
445 | logit("read change len %d", len); | |
446 | } | |
447 | fd = handle_to_fd(handle); | |
448 | if (fd >= 0) { | |
449 | if (lseek(fd, off, SEEK_SET) < 0) { | |
450 | error("process_read: seek failed"); | |
451 | status = errno_to_portable(errno); | |
452 | } else { | |
453 | ret = read(fd, buf, len); | |
454 | if (ret < 0) { | |
455 | status = errno_to_portable(errno); | |
456 | } else if (ret == 0) { | |
457 | status = SSH2_FX_EOF; | |
458 | } else { | |
459 | send_data(id, buf, ret); | |
460 | status = SSH2_FX_OK; | |
461 | } | |
462 | } | |
463 | } | |
464 | if (status != SSH2_FX_OK) | |
465 | send_status(id, status); | |
466 | } | |
467 | ||
468 | static void | |
469 | process_write(void) | |
470 | { | |
471 | u_int32_t id; | |
472 | u_int64_t off; | |
473 | u_int len; | |
474 | int handle, fd, ret, status = SSH2_FX_FAILURE; | |
475 | char *data; | |
476 | ||
477 | id = get_int(); | |
478 | handle = get_handle(); | |
479 | off = get_int64(); | |
480 | data = get_string(&len); | |
481 | ||
482 | TRACE("write id %u handle %d off %llu len %d", id, handle, | |
483 | (u_int64_t)off, len); | |
484 | fd = handle_to_fd(handle); | |
485 | if (fd >= 0) { | |
486 | if (lseek(fd, off, SEEK_SET) < 0) { | |
487 | status = errno_to_portable(errno); | |
488 | error("process_write: seek failed"); | |
489 | } else { | |
490 | /* XXX ATOMICIO ? */ | |
491 | ret = write(fd, data, len); | |
492 | if (ret == -1) { | |
493 | error("process_write: write failed"); | |
494 | status = errno_to_portable(errno); | |
495 | } else if (ret == len) { | |
496 | status = SSH2_FX_OK; | |
497 | } else { | |
498 | logit("nothing at all written"); | |
499 | } | |
500 | } | |
501 | } | |
502 | send_status(id, status); | |
503 | xfree(data); | |
504 | } | |
505 | ||
506 | static void | |
507 | process_do_stat(int do_lstat) | |
508 | { | |
509 | Attrib a; | |
510 | struct stat st; | |
511 | u_int32_t id; | |
512 | char *name; | |
513 | int ret, status = SSH2_FX_FAILURE; | |
514 | ||
515 | id = get_int(); | |
516 | name = get_string(NULL); | |
517 | TRACE("%sstat id %u name %s", do_lstat ? "l" : "", id, name); | |
518 | ret = do_lstat ? lstat(name, &st) : stat(name, &st); | |
519 | if (ret < 0) { | |
520 | status = errno_to_portable(errno); | |
521 | } else { | |
522 | stat_to_attrib(&st, &a); | |
523 | send_attrib(id, &a); | |
524 | status = SSH2_FX_OK; | |
525 | } | |
526 | if (status != SSH2_FX_OK) | |
527 | send_status(id, status); | |
528 | xfree(name); | |
529 | } | |
530 | ||
531 | static void | |
532 | process_stat(void) | |
533 | { | |
534 | process_do_stat(0); | |
535 | } | |
536 | ||
537 | static void | |
538 | process_lstat(void) | |
539 | { | |
540 | process_do_stat(1); | |
541 | } | |
542 | ||
543 | static void | |
544 | process_fstat(void) | |
545 | { | |
546 | Attrib a; | |
547 | struct stat st; | |
548 | u_int32_t id; | |
549 | int fd, ret, handle, status = SSH2_FX_FAILURE; | |
550 | ||
551 | id = get_int(); | |
552 | handle = get_handle(); | |
553 | TRACE("fstat id %u handle %d", id, handle); | |
554 | fd = handle_to_fd(handle); | |
555 | if (fd >= 0) { | |
556 | ret = fstat(fd, &st); | |
557 | if (ret < 0) { | |
558 | status = errno_to_portable(errno); | |
559 | } else { | |
560 | stat_to_attrib(&st, &a); | |
561 | send_attrib(id, &a); | |
562 | status = SSH2_FX_OK; | |
563 | } | |
564 | } | |
565 | if (status != SSH2_FX_OK) | |
566 | send_status(id, status); | |
567 | } | |
568 | ||
569 | static struct timeval * | |
570 | attrib_to_tv(Attrib *a) | |
571 | { | |
572 | static struct timeval tv[2]; | |
573 | ||
574 | tv[0].tv_sec = a->atime; | |
575 | tv[0].tv_usec = 0; | |
576 | tv[1].tv_sec = a->mtime; | |
577 | tv[1].tv_usec = 0; | |
578 | return tv; | |
579 | } | |
580 | ||
581 | static void | |
582 | process_setstat(void) | |
583 | { | |
584 | Attrib *a; | |
585 | u_int32_t id; | |
586 | char *name; | |
587 | int status = SSH2_FX_OK, ret; | |
588 | ||
589 | id = get_int(); | |
590 | name = get_string(NULL); | |
591 | a = get_attrib(); | |
592 | TRACE("setstat id %u name %s", id, name); | |
593 | if (a->flags & SSH2_FILEXFER_ATTR_SIZE) { | |
594 | ret = truncate(name, a->size); | |
595 | if (ret == -1) | |
596 | status = errno_to_portable(errno); | |
597 | } | |
598 | if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) { | |
599 | ret = chmod(name, a->perm & 0777); | |
600 | if (ret == -1) | |
601 | status = errno_to_portable(errno); | |
602 | } | |
603 | if (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME) { | |
604 | ret = utimes(name, attrib_to_tv(a)); | |
605 | if (ret == -1) | |
606 | status = errno_to_portable(errno); | |
607 | } | |
608 | if (a->flags & SSH2_FILEXFER_ATTR_UIDGID) { | |
609 | ret = chown(name, a->uid, a->gid); | |
610 | if (ret == -1) | |
611 | status = errno_to_portable(errno); | |
612 | } | |
613 | send_status(id, status); | |
614 | xfree(name); | |
615 | } | |
616 | ||
617 | static void | |
618 | process_fsetstat(void) | |
619 | { | |
620 | Attrib *a; | |
621 | u_int32_t id; | |
622 | int handle, fd, ret; | |
623 | int status = SSH2_FX_OK; | |
624 | char *name; | |
625 | ||
626 | id = get_int(); | |
627 | handle = get_handle(); | |
628 | a = get_attrib(); | |
629 | TRACE("fsetstat id %u handle %d", id, handle); | |
630 | fd = handle_to_fd(handle); | |
631 | name = handle_to_name(handle); | |
632 | if (fd < 0 || name == NULL) { | |
633 | status = SSH2_FX_FAILURE; | |
634 | } else { | |
635 | if (a->flags & SSH2_FILEXFER_ATTR_SIZE) { | |
636 | ret = ftruncate(fd, a->size); | |
637 | if (ret == -1) | |
638 | status = errno_to_portable(errno); | |
639 | } | |
640 | if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) { | |
641 | #ifdef HAVE_FCHMOD | |
642 | ret = fchmod(fd, a->perm & 0777); | |
643 | #else | |
644 | ret = chmod(name, a->perm & 0777); | |
645 | #endif | |
646 | if (ret == -1) | |
647 | status = errno_to_portable(errno); | |
648 | } | |
649 | if (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME) { | |
650 | #ifdef HAVE_FUTIMES | |
651 | ret = futimes(fd, attrib_to_tv(a)); | |
652 | #else | |
653 | ret = utimes(name, attrib_to_tv(a)); | |
654 | #endif | |
655 | if (ret == -1) | |
656 | status = errno_to_portable(errno); | |
657 | } | |
658 | if (a->flags & SSH2_FILEXFER_ATTR_UIDGID) { | |
659 | #ifdef HAVE_FCHOWN | |
660 | ret = fchown(fd, a->uid, a->gid); | |
661 | #else | |
662 | ret = chown(name, a->uid, a->gid); | |
663 | #endif | |
664 | if (ret == -1) | |
665 | status = errno_to_portable(errno); | |
666 | } | |
667 | } | |
668 | send_status(id, status); | |
669 | } | |
670 | ||
671 | static void | |
672 | process_opendir(void) | |
673 | { | |
674 | DIR *dirp = NULL; | |
675 | char *path; | |
676 | int handle, status = SSH2_FX_FAILURE; | |
677 | u_int32_t id; | |
678 | ||
679 | id = get_int(); | |
680 | path = get_string(NULL); | |
681 | TRACE("opendir id %u path %s", id, path); | |
682 | dirp = opendir(path); | |
683 | if (dirp == NULL) { | |
684 | status = errno_to_portable(errno); | |
685 | } else { | |
686 | handle = handle_new(HANDLE_DIR, path, 0, dirp); | |
687 | if (handle < 0) { | |
688 | closedir(dirp); | |
689 | } else { | |
690 | send_handle(id, handle); | |
691 | status = SSH2_FX_OK; | |
692 | } | |
693 | ||
694 | } | |
695 | if (status != SSH2_FX_OK) | |
696 | send_status(id, status); | |
697 | xfree(path); | |
698 | } | |
699 | ||
700 | static void | |
701 | process_readdir(void) | |
702 | { | |
703 | DIR *dirp; | |
704 | struct dirent *dp; | |
705 | char *path; | |
706 | int handle; | |
707 | u_int32_t id; | |
708 | ||
709 | id = get_int(); | |
710 | handle = get_handle(); | |
711 | TRACE("readdir id %u handle %d", id, handle); | |
712 | dirp = handle_to_dir(handle); | |
713 | path = handle_to_name(handle); | |
714 | if (dirp == NULL || path == NULL) { | |
715 | send_status(id, SSH2_FX_FAILURE); | |
716 | } else { | |
717 | struct stat st; | |
718 | char pathname[1024]; | |
719 | Stat *stats; | |
720 | int nstats = 10, count = 0, i; | |
721 | ||
722 | stats = xmalloc(nstats * sizeof(Stat)); | |
723 | while ((dp = readdir(dirp)) != NULL) { | |
724 | if (count >= nstats) { | |
725 | nstats *= 2; | |
726 | stats = xrealloc(stats, nstats * sizeof(Stat)); | |
727 | } | |
728 | /* XXX OVERFLOW ? */ | |
729 | snprintf(pathname, sizeof pathname, "%s%s%s", path, | |
730 | strcmp(path, "/") ? "/" : "", dp->d_name); | |
731 | if (lstat(pathname, &st) < 0) | |
732 | continue; | |
733 | stat_to_attrib(&st, &(stats[count].attrib)); | |
734 | stats[count].name = xstrdup(dp->d_name); | |
735 | stats[count].long_name = ls_file(dp->d_name, &st, 0); | |
736 | count++; | |
737 | /* send up to 100 entries in one message */ | |
738 | /* XXX check packet size instead */ | |
739 | if (count == 100) | |
740 | break; | |
741 | } | |
742 | if (count > 0) { | |
743 | send_names(id, count, stats); | |
744 | for (i = 0; i < count; i++) { | |
745 | xfree(stats[i].name); | |
746 | xfree(stats[i].long_name); | |
747 | } | |
748 | } else { | |
749 | send_status(id, SSH2_FX_EOF); | |
750 | } | |
751 | xfree(stats); | |
752 | } | |
753 | } | |
754 | ||
755 | static void | |
756 | process_remove(void) | |
757 | { | |
758 | char *name; | |
759 | u_int32_t id; | |
760 | int status = SSH2_FX_FAILURE; | |
761 | int ret; | |
762 | ||
763 | id = get_int(); | |
764 | name = get_string(NULL); | |
765 | TRACE("remove id %u name %s", id, name); | |
766 | ret = unlink(name); | |
767 | status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK; | |
768 | send_status(id, status); | |
769 | xfree(name); | |
770 | } | |
771 | ||
772 | static void | |
773 | process_mkdir(void) | |
774 | { | |
775 | Attrib *a; | |
776 | u_int32_t id; | |
777 | char *name; | |
778 | int ret, mode, status = SSH2_FX_FAILURE; | |
779 | ||
780 | id = get_int(); | |
781 | name = get_string(NULL); | |
782 | a = get_attrib(); | |
783 | mode = (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ? | |
784 | a->perm & 0777 : 0777; | |
785 | TRACE("mkdir id %u name %s mode 0%o", id, name, mode); | |
786 | ret = mkdir(name, mode); | |
787 | status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK; | |
788 | send_status(id, status); | |
789 | xfree(name); | |
790 | } | |
791 | ||
792 | static void | |
793 | process_rmdir(void) | |
794 | { | |
795 | u_int32_t id; | |
796 | char *name; | |
797 | int ret, status; | |
798 | ||
799 | id = get_int(); | |
800 | name = get_string(NULL); | |
801 | TRACE("rmdir id %u name %s", id, name); | |
802 | ret = rmdir(name); | |
803 | status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK; | |
804 | send_status(id, status); | |
805 | xfree(name); | |
806 | } | |
807 | ||
808 | static void | |
809 | process_realpath(void) | |
810 | { | |
811 | char resolvedname[MAXPATHLEN]; | |
812 | u_int32_t id; | |
813 | char *path; | |
814 | ||
815 | id = get_int(); | |
816 | path = get_string(NULL); | |
817 | if (path[0] == '\0') { | |
818 | xfree(path); | |
819 | path = xstrdup("."); | |
820 | } | |
821 | TRACE("realpath id %u path %s", id, path); | |
822 | if (realpath(path, resolvedname) == NULL) { | |
823 | send_status(id, errno_to_portable(errno)); | |
824 | } else { | |
825 | Stat s; | |
826 | attrib_clear(&s.attrib); | |
827 | s.name = s.long_name = resolvedname; | |
828 | send_names(id, 1, &s); | |
829 | } | |
830 | xfree(path); | |
831 | } | |
832 | ||
833 | static void | |
834 | process_rename(void) | |
835 | { | |
836 | u_int32_t id; | |
837 | char *oldpath, *newpath; | |
838 | int status; | |
839 | struct stat sb; | |
840 | ||
841 | id = get_int(); | |
842 | oldpath = get_string(NULL); | |
843 | newpath = get_string(NULL); | |
844 | TRACE("rename id %u old %s new %s", id, oldpath, newpath); | |
845 | status = SSH2_FX_FAILURE; | |
846 | if (lstat(oldpath, &sb) == -1) | |
847 | status = errno_to_portable(errno); | |
848 | else if (S_ISREG(sb.st_mode)) { | |
849 | /* Race-free rename of regular files */ | |
850 | if (link(oldpath, newpath) == -1) | |
851 | status = errno_to_portable(errno); | |
852 | else if (unlink(oldpath) == -1) { | |
853 | status = errno_to_portable(errno); | |
854 | /* clean spare link */ | |
855 | unlink(newpath); | |
856 | } else | |
857 | status = SSH2_FX_OK; | |
858 | } else if (stat(newpath, &sb) == -1) { | |
859 | if (rename(oldpath, newpath) == -1) | |
860 | status = errno_to_portable(errno); | |
861 | else | |
862 | status = SSH2_FX_OK; | |
863 | } | |
864 | send_status(id, status); | |
865 | xfree(oldpath); | |
866 | xfree(newpath); | |
867 | } | |
868 | ||
869 | static void | |
870 | process_readlink(void) | |
871 | { | |
872 | u_int32_t id; | |
873 | int len; | |
874 | char link[MAXPATHLEN]; | |
875 | char *path; | |
876 | ||
877 | id = get_int(); | |
878 | path = get_string(NULL); | |
879 | TRACE("readlink id %u path %s", id, path); | |
880 | if ((len = readlink(path, link, sizeof(link) - 1)) == -1) | |
881 | send_status(id, errno_to_portable(errno)); | |
882 | else { | |
883 | Stat s; | |
884 | ||
885 | link[len] = '\0'; | |
886 | attrib_clear(&s.attrib); | |
887 | s.name = s.long_name = link; | |
888 | send_names(id, 1, &s); | |
889 | } | |
890 | xfree(path); | |
891 | } | |
892 | ||
893 | static void | |
894 | process_symlink(void) | |
895 | { | |
896 | u_int32_t id; | |
897 | char *oldpath, *newpath; | |
898 | int ret, status; | |
899 | ||
900 | id = get_int(); | |
901 | oldpath = get_string(NULL); | |
902 | newpath = get_string(NULL); | |
903 | TRACE("symlink id %u old %s new %s", id, oldpath, newpath); | |
904 | /* this will fail if 'newpath' exists */ | |
905 | ret = symlink(oldpath, newpath); | |
906 | status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK; | |
907 | send_status(id, status); | |
908 | xfree(oldpath); | |
909 | xfree(newpath); | |
910 | } | |
911 | ||
912 | static void | |
913 | process_extended(void) | |
914 | { | |
915 | u_int32_t id; | |
916 | char *request; | |
917 | ||
918 | id = get_int(); | |
919 | request = get_string(NULL); | |
920 | send_status(id, SSH2_FX_OP_UNSUPPORTED); /* MUST */ | |
921 | xfree(request); | |
922 | } | |
923 | ||
924 | /* stolen from ssh-agent */ | |
925 | ||
926 | static void | |
927 | process(void) | |
928 | { | |
929 | u_int msg_len; | |
930 | u_int buf_len; | |
931 | u_int consumed; | |
932 | u_int type; | |
933 | u_char *cp; | |
934 | ||
935 | buf_len = buffer_len(&iqueue); | |
936 | if (buf_len < 5) | |
937 | return; /* Incomplete message. */ | |
938 | cp = buffer_ptr(&iqueue); | |
939 | msg_len = GET_32BIT(cp); | |
940 | if (msg_len > 256 * 1024) { | |
941 | error("bad message "); | |
942 | exit(11); | |
943 | } | |
944 | if (buf_len < msg_len + 4) | |
945 | return; | |
946 | buffer_consume(&iqueue, 4); | |
947 | buf_len -= 4; | |
948 | type = buffer_get_char(&iqueue); | |
949 | switch (type) { | |
950 | case SSH2_FXP_INIT: | |
951 | process_init(); | |
952 | break; | |
953 | case SSH2_FXP_OPEN: | |
954 | process_open(); | |
955 | break; | |
956 | case SSH2_FXP_CLOSE: | |
957 | process_close(); | |
958 | break; | |
959 | case SSH2_FXP_READ: | |
960 | process_read(); | |
961 | break; | |
962 | case SSH2_FXP_WRITE: | |
963 | process_write(); | |
964 | break; | |
965 | case SSH2_FXP_LSTAT: | |
966 | process_lstat(); | |
967 | break; | |
968 | case SSH2_FXP_FSTAT: | |
969 | process_fstat(); | |
970 | break; | |
971 | case SSH2_FXP_SETSTAT: | |
972 | process_setstat(); | |
973 | break; | |
974 | case SSH2_FXP_FSETSTAT: | |
975 | process_fsetstat(); | |
976 | break; | |
977 | case SSH2_FXP_OPENDIR: | |
978 | process_opendir(); | |
979 | break; | |
980 | case SSH2_FXP_READDIR: | |
981 | process_readdir(); | |
982 | break; | |
983 | case SSH2_FXP_REMOVE: | |
984 | process_remove(); | |
985 | break; | |
986 | case SSH2_FXP_MKDIR: | |
987 | process_mkdir(); | |
988 | break; | |
989 | case SSH2_FXP_RMDIR: | |
990 | process_rmdir(); | |
991 | break; | |
992 | case SSH2_FXP_REALPATH: | |
993 | process_realpath(); | |
994 | break; | |
995 | case SSH2_FXP_STAT: | |
996 | process_stat(); | |
997 | break; | |
998 | case SSH2_FXP_RENAME: | |
999 | process_rename(); | |
1000 | break; | |
1001 | case SSH2_FXP_READLINK: | |
1002 | process_readlink(); | |
1003 | break; | |
1004 | case SSH2_FXP_SYMLINK: | |
1005 | process_symlink(); | |
1006 | break; | |
1007 | case SSH2_FXP_EXTENDED: | |
1008 | process_extended(); | |
1009 | break; | |
1010 | default: | |
1011 | error("Unknown message %d", type); | |
1012 | break; | |
1013 | } | |
1014 | /* discard the remaining bytes from the current packet */ | |
1015 | if (buf_len < buffer_len(&iqueue)) | |
1016 | fatal("iqueue grows"); | |
1017 | consumed = buf_len - buffer_len(&iqueue); | |
1018 | if (msg_len < consumed) | |
1019 | fatal("msg_len %d < consumed %d", msg_len, consumed); | |
1020 | if (msg_len > consumed) | |
1021 | buffer_consume(&iqueue, msg_len - consumed); | |
1022 | } | |
1023 | ||
1024 | int | |
1025 | main(int ac, char **av) | |
1026 | { | |
1027 | fd_set *rset, *wset; | |
1028 | int in, out, max; | |
1029 | ssize_t len, olen, set_size; | |
1030 | ||
1031 | /* XXX should use getopt */ | |
1032 | ||
1033 | __progname = get_progname(av[0]); | |
1034 | handle_init(); | |
1035 | ||
1036 | #ifdef DEBUG_SFTP_SERVER | |
1037 | log_init("sftp-server", SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 0); | |
1038 | #endif | |
1039 | ||
1040 | in = dup(STDIN_FILENO); | |
1041 | out = dup(STDOUT_FILENO); | |
1042 | ||
1043 | #ifdef HAVE_CYGWIN | |
1044 | setmode(in, O_BINARY); | |
1045 | setmode(out, O_BINARY); | |
1046 | #endif | |
1047 | ||
1048 | max = 0; | |
1049 | if (in > max) | |
1050 | max = in; | |
1051 | if (out > max) | |
1052 | max = out; | |
1053 | ||
1054 | buffer_init(&iqueue); | |
1055 | buffer_init(&oqueue); | |
1056 | ||
1057 | set_size = howmany(max + 1, NFDBITS) * sizeof(fd_mask); | |
1058 | rset = (fd_set *)xmalloc(set_size); | |
1059 | wset = (fd_set *)xmalloc(set_size); | |
1060 | ||
1061 | for (;;) { | |
1062 | memset(rset, 0, set_size); | |
1063 | memset(wset, 0, set_size); | |
1064 | ||
1065 | FD_SET(in, rset); | |
1066 | olen = buffer_len(&oqueue); | |
1067 | if (olen > 0) | |
1068 | FD_SET(out, wset); | |
1069 | ||
1070 | if (select(max+1, rset, wset, NULL, NULL) < 0) { | |
1071 | if (errno == EINTR) | |
1072 | continue; | |
1073 | exit(2); | |
1074 | } | |
1075 | ||
1076 | /* copy stdin to iqueue */ | |
1077 | if (FD_ISSET(in, rset)) { | |
1078 | char buf[4*4096]; | |
1079 | len = read(in, buf, sizeof buf); | |
1080 | if (len == 0) { | |
1081 | debug("read eof"); | |
1082 | exit(0); | |
1083 | } else if (len < 0) { | |
1084 | error("read error"); | |
1085 | exit(1); | |
1086 | } else { | |
1087 | buffer_append(&iqueue, buf, len); | |
1088 | } | |
1089 | } | |
1090 | /* send oqueue to stdout */ | |
1091 | if (FD_ISSET(out, wset)) { | |
1092 | len = write(out, buffer_ptr(&oqueue), olen); | |
1093 | if (len < 0) { | |
1094 | error("write error"); | |
1095 | exit(1); | |
1096 | } else { | |
1097 | buffer_consume(&oqueue, len); | |
1098 | } | |
1099 | } | |
1100 | /* process requests from client */ | |
1101 | process(); | |
1102 | } | |
1103 | } |