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3c0ef626 | 1 | /* |
cdd66111 | 2 | * Copyright (c) 2000-2004 Markus Friedl. All rights reserved. |
3c0ef626 | 3 | * |
cdd66111 | 4 | * Permission to use, copy, modify, and distribute this software for any |
5 | * purpose with or without fee is hereby granted, provided that the above | |
6 | * copyright notice and this permission notice appear in all copies. | |
3c0ef626 | 7 | * |
cdd66111 | 8 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
9 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
10 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | |
11 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
12 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
13 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
14 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
3c0ef626 | 15 | */ |
16 | #include "includes.h" | |
2c06c99b | 17 | RCSID("$OpenBSD: sftp-server.c,v 1.50 2006/01/02 01:20:31 djm Exp $"); |
3c0ef626 | 18 | |
19 | #include "buffer.h" | |
20 | #include "bufaux.h" | |
21 | #include "getput.h" | |
22 | #include "log.h" | |
23 | #include "xmalloc.h" | |
2c06c99b | 24 | #include "misc.h" |
3c0ef626 | 25 | |
26 | #include "sftp.h" | |
27 | #include "sftp-common.h" | |
28 | ||
29 | /* helper */ | |
30 | #define get_int64() buffer_get_int64(&iqueue); | |
31 | #define get_int() buffer_get_int(&iqueue); | |
32 | #define get_string(lenp) buffer_get_string(&iqueue, lenp); | |
33 | #define TRACE debug | |
34 | ||
3c0ef626 | 35 | extern char *__progname; |
3c0ef626 | 36 | |
37 | /* input and output queue */ | |
38 | Buffer iqueue; | |
39 | Buffer oqueue; | |
40 | ||
41 | /* Version of client */ | |
42 | int version; | |
43 | ||
0fff78ff | 44 | /* portable attributes, etc. */ |
3c0ef626 | 45 | |
46 | typedef struct Stat Stat; | |
47 | ||
48 | struct Stat { | |
49 | char *name; | |
50 | char *long_name; | |
51 | Attrib attrib; | |
52 | }; | |
53 | ||
54 | static int | |
55 | errno_to_portable(int unixerrno) | |
56 | { | |
57 | int ret = 0; | |
58 | ||
59 | switch (unixerrno) { | |
60 | case 0: | |
61 | ret = SSH2_FX_OK; | |
62 | break; | |
63 | case ENOENT: | |
64 | case ENOTDIR: | |
65 | case EBADF: | |
66 | case ELOOP: | |
67 | ret = SSH2_FX_NO_SUCH_FILE; | |
68 | break; | |
69 | case EPERM: | |
70 | case EACCES: | |
71 | case EFAULT: | |
72 | ret = SSH2_FX_PERMISSION_DENIED; | |
73 | break; | |
74 | case ENAMETOOLONG: | |
75 | case EINVAL: | |
76 | ret = SSH2_FX_BAD_MESSAGE; | |
77 | break; | |
78 | default: | |
79 | ret = SSH2_FX_FAILURE; | |
80 | break; | |
81 | } | |
82 | return ret; | |
83 | } | |
84 | ||
85 | static int | |
86 | flags_from_portable(int pflags) | |
87 | { | |
88 | int flags = 0; | |
89 | ||
90 | if ((pflags & SSH2_FXF_READ) && | |
91 | (pflags & SSH2_FXF_WRITE)) { | |
92 | flags = O_RDWR; | |
93 | } else if (pflags & SSH2_FXF_READ) { | |
94 | flags = O_RDONLY; | |
95 | } else if (pflags & SSH2_FXF_WRITE) { | |
96 | flags = O_WRONLY; | |
97 | } | |
98 | if (pflags & SSH2_FXF_CREAT) | |
99 | flags |= O_CREAT; | |
100 | if (pflags & SSH2_FXF_TRUNC) | |
101 | flags |= O_TRUNC; | |
102 | if (pflags & SSH2_FXF_EXCL) | |
103 | flags |= O_EXCL; | |
104 | return flags; | |
105 | } | |
106 | ||
107 | static Attrib * | |
108 | get_attrib(void) | |
109 | { | |
110 | return decode_attrib(&iqueue); | |
111 | } | |
112 | ||
113 | /* handle handles */ | |
114 | ||
115 | typedef struct Handle Handle; | |
116 | struct Handle { | |
117 | int use; | |
118 | DIR *dirp; | |
119 | int fd; | |
120 | char *name; | |
121 | }; | |
122 | ||
123 | enum { | |
124 | HANDLE_UNUSED, | |
125 | HANDLE_DIR, | |
126 | HANDLE_FILE | |
127 | }; | |
128 | ||
129 | Handle handles[100]; | |
130 | ||
131 | static void | |
132 | handle_init(void) | |
133 | { | |
665a873d | 134 | u_int i; |
3c0ef626 | 135 | |
e9a17296 | 136 | for (i = 0; i < sizeof(handles)/sizeof(Handle); i++) |
3c0ef626 | 137 | handles[i].use = HANDLE_UNUSED; |
138 | } | |
139 | ||
140 | static int | |
cdd66111 | 141 | handle_new(int use, const char *name, int fd, DIR *dirp) |
3c0ef626 | 142 | { |
665a873d | 143 | u_int i; |
3c0ef626 | 144 | |
e9a17296 | 145 | for (i = 0; i < sizeof(handles)/sizeof(Handle); i++) { |
3c0ef626 | 146 | if (handles[i].use == HANDLE_UNUSED) { |
147 | handles[i].use = use; | |
148 | handles[i].dirp = dirp; | |
149 | handles[i].fd = fd; | |
6a9b3198 | 150 | handles[i].name = xstrdup(name); |
3c0ef626 | 151 | return i; |
152 | } | |
153 | } | |
154 | return -1; | |
155 | } | |
156 | ||
157 | static int | |
158 | handle_is_ok(int i, int type) | |
159 | { | |
665a873d | 160 | return i >= 0 && (u_int)i < sizeof(handles)/sizeof(Handle) && |
3c0ef626 | 161 | handles[i].use == type; |
162 | } | |
163 | ||
164 | static int | |
165 | handle_to_string(int handle, char **stringp, int *hlenp) | |
166 | { | |
167 | if (stringp == NULL || hlenp == NULL) | |
168 | return -1; | |
169 | *stringp = xmalloc(sizeof(int32_t)); | |
170 | PUT_32BIT(*stringp, handle); | |
171 | *hlenp = sizeof(int32_t); | |
172 | return 0; | |
173 | } | |
174 | ||
175 | static int | |
cdd66111 | 176 | handle_from_string(const char *handle, u_int hlen) |
3c0ef626 | 177 | { |
178 | int val; | |
179 | ||
180 | if (hlen != sizeof(int32_t)) | |
181 | return -1; | |
182 | val = GET_32BIT(handle); | |
183 | if (handle_is_ok(val, HANDLE_FILE) || | |
184 | handle_is_ok(val, HANDLE_DIR)) | |
185 | return val; | |
186 | return -1; | |
187 | } | |
188 | ||
189 | static char * | |
190 | handle_to_name(int handle) | |
191 | { | |
192 | if (handle_is_ok(handle, HANDLE_DIR)|| | |
193 | handle_is_ok(handle, HANDLE_FILE)) | |
194 | return handles[handle].name; | |
195 | return NULL; | |
196 | } | |
197 | ||
198 | static DIR * | |
199 | handle_to_dir(int handle) | |
200 | { | |
201 | if (handle_is_ok(handle, HANDLE_DIR)) | |
202 | return handles[handle].dirp; | |
203 | return NULL; | |
204 | } | |
205 | ||
206 | static int | |
207 | handle_to_fd(int handle) | |
208 | { | |
209 | if (handle_is_ok(handle, HANDLE_FILE)) | |
210 | return handles[handle].fd; | |
211 | return -1; | |
212 | } | |
213 | ||
214 | static int | |
215 | handle_close(int handle) | |
216 | { | |
217 | int ret = -1; | |
218 | ||
219 | if (handle_is_ok(handle, HANDLE_FILE)) { | |
220 | ret = close(handles[handle].fd); | |
221 | handles[handle].use = HANDLE_UNUSED; | |
6a9b3198 | 222 | xfree(handles[handle].name); |
3c0ef626 | 223 | } else if (handle_is_ok(handle, HANDLE_DIR)) { |
224 | ret = closedir(handles[handle].dirp); | |
225 | handles[handle].use = HANDLE_UNUSED; | |
6a9b3198 | 226 | xfree(handles[handle].name); |
3c0ef626 | 227 | } else { |
228 | errno = ENOENT; | |
229 | } | |
230 | return ret; | |
231 | } | |
232 | ||
233 | static int | |
234 | get_handle(void) | |
235 | { | |
236 | char *handle; | |
237 | int val = -1; | |
238 | u_int hlen; | |
239 | ||
240 | handle = get_string(&hlen); | |
241 | if (hlen < 256) | |
242 | val = handle_from_string(handle, hlen); | |
243 | xfree(handle); | |
244 | return val; | |
245 | } | |
246 | ||
247 | /* send replies */ | |
248 | ||
249 | static void | |
250 | send_msg(Buffer *m) | |
251 | { | |
252 | int mlen = buffer_len(m); | |
253 | ||
254 | buffer_put_int(&oqueue, mlen); | |
255 | buffer_append(&oqueue, buffer_ptr(m), mlen); | |
256 | buffer_consume(m, mlen); | |
257 | } | |
258 | ||
259 | static void | |
c9f39d2c | 260 | send_status(u_int32_t id, u_int32_t status) |
3c0ef626 | 261 | { |
262 | Buffer msg; | |
263 | const char *status_messages[] = { | |
264 | "Success", /* SSH_FX_OK */ | |
265 | "End of file", /* SSH_FX_EOF */ | |
266 | "No such file", /* SSH_FX_NO_SUCH_FILE */ | |
267 | "Permission denied", /* SSH_FX_PERMISSION_DENIED */ | |
268 | "Failure", /* SSH_FX_FAILURE */ | |
269 | "Bad message", /* SSH_FX_BAD_MESSAGE */ | |
270 | "No connection", /* SSH_FX_NO_CONNECTION */ | |
271 | "Connection lost", /* SSH_FX_CONNECTION_LOST */ | |
272 | "Operation unsupported", /* SSH_FX_OP_UNSUPPORTED */ | |
273 | "Unknown error" /* Others */ | |
274 | }; | |
275 | ||
c9f39d2c | 276 | TRACE("sent status id %u error %u", id, status); |
3c0ef626 | 277 | buffer_init(&msg); |
278 | buffer_put_char(&msg, SSH2_FXP_STATUS); | |
279 | buffer_put_int(&msg, id); | |
c9f39d2c | 280 | buffer_put_int(&msg, status); |
3c0ef626 | 281 | if (version >= 3) { |
282 | buffer_put_cstring(&msg, | |
c9f39d2c | 283 | status_messages[MIN(status,SSH2_FX_MAX)]); |
3c0ef626 | 284 | buffer_put_cstring(&msg, ""); |
285 | } | |
286 | send_msg(&msg); | |
287 | buffer_free(&msg); | |
288 | } | |
289 | static void | |
cdd66111 | 290 | send_data_or_handle(char type, u_int32_t id, const char *data, int dlen) |
3c0ef626 | 291 | { |
292 | Buffer msg; | |
293 | ||
294 | buffer_init(&msg); | |
295 | buffer_put_char(&msg, type); | |
296 | buffer_put_int(&msg, id); | |
297 | buffer_put_string(&msg, data, dlen); | |
298 | send_msg(&msg); | |
299 | buffer_free(&msg); | |
300 | } | |
301 | ||
302 | static void | |
cdd66111 | 303 | send_data(u_int32_t id, const char *data, int dlen) |
3c0ef626 | 304 | { |
680cee3b | 305 | TRACE("sent data id %u len %d", id, dlen); |
3c0ef626 | 306 | send_data_or_handle(SSH2_FXP_DATA, id, data, dlen); |
307 | } | |
308 | ||
309 | static void | |
310 | send_handle(u_int32_t id, int handle) | |
311 | { | |
312 | char *string; | |
313 | int hlen; | |
314 | ||
315 | handle_to_string(handle, &string, &hlen); | |
680cee3b | 316 | TRACE("sent handle id %u handle %d", id, handle); |
3c0ef626 | 317 | send_data_or_handle(SSH2_FXP_HANDLE, id, string, hlen); |
318 | xfree(string); | |
319 | } | |
320 | ||
321 | static void | |
cdd66111 | 322 | send_names(u_int32_t id, int count, const Stat *stats) |
3c0ef626 | 323 | { |
324 | Buffer msg; | |
325 | int i; | |
326 | ||
327 | buffer_init(&msg); | |
328 | buffer_put_char(&msg, SSH2_FXP_NAME); | |
329 | buffer_put_int(&msg, id); | |
330 | buffer_put_int(&msg, count); | |
680cee3b | 331 | TRACE("sent names id %u count %d", id, count); |
3c0ef626 | 332 | for (i = 0; i < count; i++) { |
333 | buffer_put_cstring(&msg, stats[i].name); | |
334 | buffer_put_cstring(&msg, stats[i].long_name); | |
335 | encode_attrib(&msg, &stats[i].attrib); | |
336 | } | |
337 | send_msg(&msg); | |
338 | buffer_free(&msg); | |
339 | } | |
340 | ||
341 | static void | |
cdd66111 | 342 | send_attrib(u_int32_t id, const Attrib *a) |
3c0ef626 | 343 | { |
344 | Buffer msg; | |
345 | ||
680cee3b | 346 | TRACE("sent attrib id %u have 0x%x", id, a->flags); |
3c0ef626 | 347 | buffer_init(&msg); |
348 | buffer_put_char(&msg, SSH2_FXP_ATTRS); | |
349 | buffer_put_int(&msg, id); | |
350 | encode_attrib(&msg, a); | |
351 | send_msg(&msg); | |
352 | buffer_free(&msg); | |
353 | } | |
354 | ||
355 | /* parse incoming */ | |
356 | ||
357 | static void | |
358 | process_init(void) | |
359 | { | |
360 | Buffer msg; | |
361 | ||
f5799ae1 | 362 | version = get_int(); |
3c0ef626 | 363 | TRACE("client version %d", version); |
364 | buffer_init(&msg); | |
365 | buffer_put_char(&msg, SSH2_FXP_VERSION); | |
366 | buffer_put_int(&msg, SSH2_FILEXFER_VERSION); | |
367 | send_msg(&msg); | |
368 | buffer_free(&msg); | |
369 | } | |
370 | ||
371 | static void | |
372 | process_open(void) | |
373 | { | |
374 | u_int32_t id, pflags; | |
375 | Attrib *a; | |
376 | char *name; | |
377 | int handle, fd, flags, mode, status = SSH2_FX_FAILURE; | |
378 | ||
379 | id = get_int(); | |
380 | name = get_string(NULL); | |
381 | pflags = get_int(); /* portable flags */ | |
382 | a = get_attrib(); | |
383 | flags = flags_from_portable(pflags); | |
384 | mode = (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ? a->perm : 0666; | |
680cee3b | 385 | TRACE("open id %u name %s flags %d mode 0%o", id, name, pflags, mode); |
3c0ef626 | 386 | fd = open(name, flags, mode); |
387 | if (fd < 0) { | |
388 | status = errno_to_portable(errno); | |
389 | } else { | |
6a9b3198 | 390 | handle = handle_new(HANDLE_FILE, name, fd, NULL); |
3c0ef626 | 391 | if (handle < 0) { |
392 | close(fd); | |
393 | } else { | |
394 | send_handle(id, handle); | |
395 | status = SSH2_FX_OK; | |
396 | } | |
397 | } | |
398 | if (status != SSH2_FX_OK) | |
399 | send_status(id, status); | |
400 | xfree(name); | |
401 | } | |
402 | ||
403 | static void | |
404 | process_close(void) | |
405 | { | |
406 | u_int32_t id; | |
407 | int handle, ret, status = SSH2_FX_FAILURE; | |
408 | ||
409 | id = get_int(); | |
410 | handle = get_handle(); | |
680cee3b | 411 | TRACE("close id %u handle %d", id, handle); |
3c0ef626 | 412 | ret = handle_close(handle); |
413 | status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK; | |
414 | send_status(id, status); | |
415 | } | |
416 | ||
417 | static void | |
418 | process_read(void) | |
419 | { | |
420 | char buf[64*1024]; | |
421 | u_int32_t id, len; | |
422 | int handle, fd, ret, status = SSH2_FX_FAILURE; | |
423 | u_int64_t off; | |
424 | ||
425 | id = get_int(); | |
426 | handle = get_handle(); | |
427 | off = get_int64(); | |
428 | len = get_int(); | |
429 | ||
680cee3b | 430 | TRACE("read id %u handle %d off %llu len %d", id, handle, |
2c06c99b | 431 | (unsigned long long)off, len); |
3c0ef626 | 432 | if (len > sizeof buf) { |
433 | len = sizeof buf; | |
0fff78ff | 434 | logit("read change len %d", len); |
3c0ef626 | 435 | } |
436 | fd = handle_to_fd(handle); | |
437 | if (fd >= 0) { | |
438 | if (lseek(fd, off, SEEK_SET) < 0) { | |
439 | error("process_read: seek failed"); | |
440 | status = errno_to_portable(errno); | |
441 | } else { | |
442 | ret = read(fd, buf, len); | |
443 | if (ret < 0) { | |
444 | status = errno_to_portable(errno); | |
445 | } else if (ret == 0) { | |
446 | status = SSH2_FX_EOF; | |
447 | } else { | |
448 | send_data(id, buf, ret); | |
449 | status = SSH2_FX_OK; | |
450 | } | |
451 | } | |
452 | } | |
453 | if (status != SSH2_FX_OK) | |
454 | send_status(id, status); | |
455 | } | |
456 | ||
457 | static void | |
458 | process_write(void) | |
459 | { | |
460 | u_int32_t id; | |
461 | u_int64_t off; | |
462 | u_int len; | |
463 | int handle, fd, ret, status = SSH2_FX_FAILURE; | |
464 | char *data; | |
465 | ||
466 | id = get_int(); | |
467 | handle = get_handle(); | |
468 | off = get_int64(); | |
469 | data = get_string(&len); | |
470 | ||
680cee3b | 471 | TRACE("write id %u handle %d off %llu len %d", id, handle, |
2c06c99b | 472 | (unsigned long long)off, len); |
3c0ef626 | 473 | fd = handle_to_fd(handle); |
474 | if (fd >= 0) { | |
475 | if (lseek(fd, off, SEEK_SET) < 0) { | |
476 | status = errno_to_portable(errno); | |
477 | error("process_write: seek failed"); | |
478 | } else { | |
479 | /* XXX ATOMICIO ? */ | |
480 | ret = write(fd, data, len); | |
665a873d | 481 | if (ret < 0) { |
3c0ef626 | 482 | error("process_write: write failed"); |
483 | status = errno_to_portable(errno); | |
665a873d | 484 | } else if ((size_t)ret == len) { |
3c0ef626 | 485 | status = SSH2_FX_OK; |
486 | } else { | |
0fff78ff | 487 | logit("nothing at all written"); |
3c0ef626 | 488 | } |
489 | } | |
490 | } | |
491 | send_status(id, status); | |
492 | xfree(data); | |
493 | } | |
494 | ||
495 | static void | |
496 | process_do_stat(int do_lstat) | |
497 | { | |
498 | Attrib a; | |
499 | struct stat st; | |
500 | u_int32_t id; | |
501 | char *name; | |
502 | int ret, status = SSH2_FX_FAILURE; | |
503 | ||
504 | id = get_int(); | |
505 | name = get_string(NULL); | |
680cee3b | 506 | TRACE("%sstat id %u name %s", do_lstat ? "l" : "", id, name); |
3c0ef626 | 507 | ret = do_lstat ? lstat(name, &st) : stat(name, &st); |
508 | if (ret < 0) { | |
509 | status = errno_to_portable(errno); | |
510 | } else { | |
511 | stat_to_attrib(&st, &a); | |
512 | send_attrib(id, &a); | |
513 | status = SSH2_FX_OK; | |
514 | } | |
515 | if (status != SSH2_FX_OK) | |
516 | send_status(id, status); | |
517 | xfree(name); | |
518 | } | |
519 | ||
520 | static void | |
521 | process_stat(void) | |
522 | { | |
523 | process_do_stat(0); | |
524 | } | |
525 | ||
526 | static void | |
527 | process_lstat(void) | |
528 | { | |
529 | process_do_stat(1); | |
530 | } | |
531 | ||
532 | static void | |
533 | process_fstat(void) | |
534 | { | |
535 | Attrib a; | |
536 | struct stat st; | |
537 | u_int32_t id; | |
538 | int fd, ret, handle, status = SSH2_FX_FAILURE; | |
539 | ||
540 | id = get_int(); | |
541 | handle = get_handle(); | |
680cee3b | 542 | TRACE("fstat id %u handle %d", id, handle); |
3c0ef626 | 543 | fd = handle_to_fd(handle); |
544 | if (fd >= 0) { | |
545 | ret = fstat(fd, &st); | |
546 | if (ret < 0) { | |
547 | status = errno_to_portable(errno); | |
548 | } else { | |
549 | stat_to_attrib(&st, &a); | |
550 | send_attrib(id, &a); | |
551 | status = SSH2_FX_OK; | |
552 | } | |
553 | } | |
554 | if (status != SSH2_FX_OK) | |
555 | send_status(id, status); | |
556 | } | |
557 | ||
558 | static struct timeval * | |
cdd66111 | 559 | attrib_to_tv(const Attrib *a) |
3c0ef626 | 560 | { |
561 | static struct timeval tv[2]; | |
562 | ||
563 | tv[0].tv_sec = a->atime; | |
564 | tv[0].tv_usec = 0; | |
565 | tv[1].tv_sec = a->mtime; | |
566 | tv[1].tv_usec = 0; | |
567 | return tv; | |
568 | } | |
569 | ||
570 | static void | |
571 | process_setstat(void) | |
572 | { | |
573 | Attrib *a; | |
574 | u_int32_t id; | |
575 | char *name; | |
680cee3b | 576 | int status = SSH2_FX_OK, ret; |
3c0ef626 | 577 | |
578 | id = get_int(); | |
579 | name = get_string(NULL); | |
580 | a = get_attrib(); | |
680cee3b | 581 | TRACE("setstat id %u name %s", id, name); |
e9a17296 | 582 | if (a->flags & SSH2_FILEXFER_ATTR_SIZE) { |
583 | ret = truncate(name, a->size); | |
584 | if (ret == -1) | |
585 | status = errno_to_portable(errno); | |
586 | } | |
3c0ef626 | 587 | if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) { |
588 | ret = chmod(name, a->perm & 0777); | |
589 | if (ret == -1) | |
590 | status = errno_to_portable(errno); | |
591 | } | |
592 | if (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME) { | |
593 | ret = utimes(name, attrib_to_tv(a)); | |
594 | if (ret == -1) | |
595 | status = errno_to_portable(errno); | |
596 | } | |
597 | if (a->flags & SSH2_FILEXFER_ATTR_UIDGID) { | |
598 | ret = chown(name, a->uid, a->gid); | |
599 | if (ret == -1) | |
600 | status = errno_to_portable(errno); | |
601 | } | |
602 | send_status(id, status); | |
603 | xfree(name); | |
604 | } | |
605 | ||
606 | static void | |
607 | process_fsetstat(void) | |
608 | { | |
609 | Attrib *a; | |
610 | u_int32_t id; | |
611 | int handle, fd, ret; | |
612 | int status = SSH2_FX_OK; | |
613 | char *name; | |
614 | ||
615 | id = get_int(); | |
616 | handle = get_handle(); | |
617 | a = get_attrib(); | |
680cee3b | 618 | TRACE("fsetstat id %u handle %d", id, handle); |
3c0ef626 | 619 | fd = handle_to_fd(handle); |
620 | name = handle_to_name(handle); | |
621 | if (fd < 0 || name == NULL) { | |
622 | status = SSH2_FX_FAILURE; | |
623 | } else { | |
e9a17296 | 624 | if (a->flags & SSH2_FILEXFER_ATTR_SIZE) { |
625 | ret = ftruncate(fd, a->size); | |
626 | if (ret == -1) | |
627 | status = errno_to_portable(errno); | |
628 | } | |
3c0ef626 | 629 | if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) { |
630 | #ifdef HAVE_FCHMOD | |
631 | ret = fchmod(fd, a->perm & 0777); | |
632 | #else | |
633 | ret = chmod(name, a->perm & 0777); | |
634 | #endif | |
635 | if (ret == -1) | |
636 | status = errno_to_portable(errno); | |
637 | } | |
638 | if (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME) { | |
639 | #ifdef HAVE_FUTIMES | |
640 | ret = futimes(fd, attrib_to_tv(a)); | |
641 | #else | |
642 | ret = utimes(name, attrib_to_tv(a)); | |
643 | #endif | |
644 | if (ret == -1) | |
645 | status = errno_to_portable(errno); | |
646 | } | |
647 | if (a->flags & SSH2_FILEXFER_ATTR_UIDGID) { | |
648 | #ifdef HAVE_FCHOWN | |
649 | ret = fchown(fd, a->uid, a->gid); | |
650 | #else | |
651 | ret = chown(name, a->uid, a->gid); | |
652 | #endif | |
653 | if (ret == -1) | |
654 | status = errno_to_portable(errno); | |
655 | } | |
656 | } | |
657 | send_status(id, status); | |
658 | } | |
659 | ||
660 | static void | |
661 | process_opendir(void) | |
662 | { | |
663 | DIR *dirp = NULL; | |
664 | char *path; | |
665 | int handle, status = SSH2_FX_FAILURE; | |
666 | u_int32_t id; | |
667 | ||
668 | id = get_int(); | |
669 | path = get_string(NULL); | |
680cee3b | 670 | TRACE("opendir id %u path %s", id, path); |
3c0ef626 | 671 | dirp = opendir(path); |
672 | if (dirp == NULL) { | |
673 | status = errno_to_portable(errno); | |
674 | } else { | |
6a9b3198 | 675 | handle = handle_new(HANDLE_DIR, path, 0, dirp); |
3c0ef626 | 676 | if (handle < 0) { |
677 | closedir(dirp); | |
678 | } else { | |
679 | send_handle(id, handle); | |
680 | status = SSH2_FX_OK; | |
681 | } | |
682 | ||
683 | } | |
684 | if (status != SSH2_FX_OK) | |
685 | send_status(id, status); | |
686 | xfree(path); | |
687 | } | |
688 | ||
3c0ef626 | 689 | static void |
690 | process_readdir(void) | |
691 | { | |
692 | DIR *dirp; | |
693 | struct dirent *dp; | |
694 | char *path; | |
695 | int handle; | |
696 | u_int32_t id; | |
697 | ||
698 | id = get_int(); | |
699 | handle = get_handle(); | |
680cee3b | 700 | TRACE("readdir id %u handle %d", id, handle); |
3c0ef626 | 701 | dirp = handle_to_dir(handle); |
702 | path = handle_to_name(handle); | |
703 | if (dirp == NULL || path == NULL) { | |
704 | send_status(id, SSH2_FX_FAILURE); | |
705 | } else { | |
706 | struct stat st; | |
707 | char pathname[1024]; | |
708 | Stat *stats; | |
709 | int nstats = 10, count = 0, i; | |
680cee3b | 710 | |
3c0ef626 | 711 | stats = xmalloc(nstats * sizeof(Stat)); |
712 | while ((dp = readdir(dirp)) != NULL) { | |
713 | if (count >= nstats) { | |
714 | nstats *= 2; | |
715 | stats = xrealloc(stats, nstats * sizeof(Stat)); | |
716 | } | |
717 | /* XXX OVERFLOW ? */ | |
718 | snprintf(pathname, sizeof pathname, "%s%s%s", path, | |
719 | strcmp(path, "/") ? "/" : "", dp->d_name); | |
720 | if (lstat(pathname, &st) < 0) | |
721 | continue; | |
722 | stat_to_attrib(&st, &(stats[count].attrib)); | |
723 | stats[count].name = xstrdup(dp->d_name); | |
41b2f314 | 724 | stats[count].long_name = ls_file(dp->d_name, &st, 0); |
3c0ef626 | 725 | count++; |
726 | /* send up to 100 entries in one message */ | |
727 | /* XXX check packet size instead */ | |
728 | if (count == 100) | |
729 | break; | |
730 | } | |
731 | if (count > 0) { | |
732 | send_names(id, count, stats); | |
e9a17296 | 733 | for (i = 0; i < count; i++) { |
3c0ef626 | 734 | xfree(stats[i].name); |
735 | xfree(stats[i].long_name); | |
736 | } | |
737 | } else { | |
738 | send_status(id, SSH2_FX_EOF); | |
739 | } | |
740 | xfree(stats); | |
741 | } | |
742 | } | |
743 | ||
744 | static void | |
745 | process_remove(void) | |
746 | { | |
747 | char *name; | |
748 | u_int32_t id; | |
749 | int status = SSH2_FX_FAILURE; | |
750 | int ret; | |
751 | ||
752 | id = get_int(); | |
753 | name = get_string(NULL); | |
680cee3b | 754 | TRACE("remove id %u name %s", id, name); |
3c0ef626 | 755 | ret = unlink(name); |
756 | status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK; | |
757 | send_status(id, status); | |
758 | xfree(name); | |
759 | } | |
760 | ||
761 | static void | |
762 | process_mkdir(void) | |
763 | { | |
764 | Attrib *a; | |
765 | u_int32_t id; | |
766 | char *name; | |
767 | int ret, mode, status = SSH2_FX_FAILURE; | |
768 | ||
769 | id = get_int(); | |
770 | name = get_string(NULL); | |
771 | a = get_attrib(); | |
772 | mode = (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ? | |
773 | a->perm & 0777 : 0777; | |
680cee3b | 774 | TRACE("mkdir id %u name %s mode 0%o", id, name, mode); |
3c0ef626 | 775 | ret = mkdir(name, mode); |
776 | status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK; | |
777 | send_status(id, status); | |
778 | xfree(name); | |
779 | } | |
780 | ||
781 | static void | |
782 | process_rmdir(void) | |
783 | { | |
784 | u_int32_t id; | |
785 | char *name; | |
786 | int ret, status; | |
787 | ||
788 | id = get_int(); | |
789 | name = get_string(NULL); | |
680cee3b | 790 | TRACE("rmdir id %u name %s", id, name); |
3c0ef626 | 791 | ret = rmdir(name); |
792 | status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK; | |
793 | send_status(id, status); | |
794 | xfree(name); | |
795 | } | |
796 | ||
797 | static void | |
798 | process_realpath(void) | |
799 | { | |
800 | char resolvedname[MAXPATHLEN]; | |
801 | u_int32_t id; | |
802 | char *path; | |
803 | ||
804 | id = get_int(); | |
805 | path = get_string(NULL); | |
806 | if (path[0] == '\0') { | |
807 | xfree(path); | |
808 | path = xstrdup("."); | |
809 | } | |
680cee3b | 810 | TRACE("realpath id %u path %s", id, path); |
3c0ef626 | 811 | if (realpath(path, resolvedname) == NULL) { |
812 | send_status(id, errno_to_portable(errno)); | |
813 | } else { | |
814 | Stat s; | |
815 | attrib_clear(&s.attrib); | |
816 | s.name = s.long_name = resolvedname; | |
817 | send_names(id, 1, &s); | |
818 | } | |
819 | xfree(path); | |
820 | } | |
821 | ||
822 | static void | |
823 | process_rename(void) | |
824 | { | |
825 | u_int32_t id; | |
3c0ef626 | 826 | char *oldpath, *newpath; |
6a9b3198 | 827 | int status; |
828 | struct stat sb; | |
3c0ef626 | 829 | |
830 | id = get_int(); | |
831 | oldpath = get_string(NULL); | |
832 | newpath = get_string(NULL); | |
680cee3b | 833 | TRACE("rename id %u old %s new %s", id, oldpath, newpath); |
6a9b3198 | 834 | status = SSH2_FX_FAILURE; |
835 | if (lstat(oldpath, &sb) == -1) | |
836 | status = errno_to_portable(errno); | |
837 | else if (S_ISREG(sb.st_mode)) { | |
838 | /* Race-free rename of regular files */ | |
c9f39d2c | 839 | if (link(oldpath, newpath) == -1) { |
840 | if (errno == EOPNOTSUPP | |
841 | #ifdef LINK_OPNOTSUPP_ERRNO | |
842 | || errno == LINK_OPNOTSUPP_ERRNO | |
843 | #endif | |
844 | ) { | |
845 | struct stat st; | |
846 | ||
847 | /* | |
848 | * fs doesn't support links, so fall back to | |
849 | * stat+rename. This is racy. | |
850 | */ | |
851 | if (stat(newpath, &st) == -1) { | |
852 | if (rename(oldpath, newpath) == -1) | |
853 | status = | |
854 | errno_to_portable(errno); | |
855 | else | |
856 | status = SSH2_FX_OK; | |
857 | } | |
858 | } else { | |
859 | status = errno_to_portable(errno); | |
860 | } | |
861 | } else if (unlink(oldpath) == -1) { | |
6a9b3198 | 862 | status = errno_to_portable(errno); |
863 | /* clean spare link */ | |
864 | unlink(newpath); | |
865 | } else | |
866 | status = SSH2_FX_OK; | |
867 | } else if (stat(newpath, &sb) == -1) { | |
868 | if (rename(oldpath, newpath) == -1) | |
869 | status = errno_to_portable(errno); | |
870 | else | |
871 | status = SSH2_FX_OK; | |
3c0ef626 | 872 | } |
873 | send_status(id, status); | |
874 | xfree(oldpath); | |
875 | xfree(newpath); | |
876 | } | |
877 | ||
878 | static void | |
879 | process_readlink(void) | |
880 | { | |
881 | u_int32_t id; | |
882 | int len; | |
c9f39d2c | 883 | char buf[MAXPATHLEN]; |
3c0ef626 | 884 | char *path; |
885 | ||
886 | id = get_int(); | |
887 | path = get_string(NULL); | |
680cee3b | 888 | TRACE("readlink id %u path %s", id, path); |
c9f39d2c | 889 | if ((len = readlink(path, buf, sizeof(buf) - 1)) == -1) |
3c0ef626 | 890 | send_status(id, errno_to_portable(errno)); |
891 | else { | |
892 | Stat s; | |
e9a17296 | 893 | |
c9f39d2c | 894 | buf[len] = '\0'; |
3c0ef626 | 895 | attrib_clear(&s.attrib); |
c9f39d2c | 896 | s.name = s.long_name = buf; |
3c0ef626 | 897 | send_names(id, 1, &s); |
898 | } | |
899 | xfree(path); | |
900 | } | |
901 | ||
902 | static void | |
903 | process_symlink(void) | |
904 | { | |
905 | u_int32_t id; | |
3c0ef626 | 906 | char *oldpath, *newpath; |
6a9b3198 | 907 | int ret, status; |
3c0ef626 | 908 | |
909 | id = get_int(); | |
910 | oldpath = get_string(NULL); | |
911 | newpath = get_string(NULL); | |
680cee3b | 912 | TRACE("symlink id %u old %s new %s", id, oldpath, newpath); |
6a9b3198 | 913 | /* this will fail if 'newpath' exists */ |
914 | ret = symlink(oldpath, newpath); | |
915 | status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK; | |
3c0ef626 | 916 | send_status(id, status); |
917 | xfree(oldpath); | |
918 | xfree(newpath); | |
919 | } | |
920 | ||
921 | static void | |
922 | process_extended(void) | |
923 | { | |
924 | u_int32_t id; | |
925 | char *request; | |
926 | ||
927 | id = get_int(); | |
928 | request = get_string(NULL); | |
929 | send_status(id, SSH2_FX_OP_UNSUPPORTED); /* MUST */ | |
930 | xfree(request); | |
931 | } | |
932 | ||
933 | /* stolen from ssh-agent */ | |
934 | ||
935 | static void | |
936 | process(void) | |
937 | { | |
938 | u_int msg_len; | |
f5799ae1 | 939 | u_int buf_len; |
940 | u_int consumed; | |
3c0ef626 | 941 | u_int type; |
942 | u_char *cp; | |
943 | ||
f5799ae1 | 944 | buf_len = buffer_len(&iqueue); |
945 | if (buf_len < 5) | |
3c0ef626 | 946 | return; /* Incomplete message. */ |
e9a17296 | 947 | cp = buffer_ptr(&iqueue); |
3c0ef626 | 948 | msg_len = GET_32BIT(cp); |
2c06c99b | 949 | if (msg_len > SFTP_MAX_MSG_LENGTH) { |
3c0ef626 | 950 | error("bad message "); |
951 | exit(11); | |
952 | } | |
f5799ae1 | 953 | if (buf_len < msg_len + 4) |
3c0ef626 | 954 | return; |
955 | buffer_consume(&iqueue, 4); | |
f5799ae1 | 956 | buf_len -= 4; |
3c0ef626 | 957 | type = buffer_get_char(&iqueue); |
958 | switch (type) { | |
959 | case SSH2_FXP_INIT: | |
960 | process_init(); | |
961 | break; | |
962 | case SSH2_FXP_OPEN: | |
963 | process_open(); | |
964 | break; | |
965 | case SSH2_FXP_CLOSE: | |
966 | process_close(); | |
967 | break; | |
968 | case SSH2_FXP_READ: | |
969 | process_read(); | |
970 | break; | |
971 | case SSH2_FXP_WRITE: | |
972 | process_write(); | |
973 | break; | |
974 | case SSH2_FXP_LSTAT: | |
975 | process_lstat(); | |
976 | break; | |
977 | case SSH2_FXP_FSTAT: | |
978 | process_fstat(); | |
979 | break; | |
980 | case SSH2_FXP_SETSTAT: | |
981 | process_setstat(); | |
982 | break; | |
983 | case SSH2_FXP_FSETSTAT: | |
984 | process_fsetstat(); | |
985 | break; | |
986 | case SSH2_FXP_OPENDIR: | |
987 | process_opendir(); | |
988 | break; | |
989 | case SSH2_FXP_READDIR: | |
990 | process_readdir(); | |
991 | break; | |
992 | case SSH2_FXP_REMOVE: | |
993 | process_remove(); | |
994 | break; | |
995 | case SSH2_FXP_MKDIR: | |
996 | process_mkdir(); | |
997 | break; | |
998 | case SSH2_FXP_RMDIR: | |
999 | process_rmdir(); | |
1000 | break; | |
1001 | case SSH2_FXP_REALPATH: | |
1002 | process_realpath(); | |
1003 | break; | |
1004 | case SSH2_FXP_STAT: | |
1005 | process_stat(); | |
1006 | break; | |
1007 | case SSH2_FXP_RENAME: | |
1008 | process_rename(); | |
1009 | break; | |
1010 | case SSH2_FXP_READLINK: | |
1011 | process_readlink(); | |
1012 | break; | |
1013 | case SSH2_FXP_SYMLINK: | |
1014 | process_symlink(); | |
1015 | break; | |
1016 | case SSH2_FXP_EXTENDED: | |
1017 | process_extended(); | |
1018 | break; | |
1019 | default: | |
1020 | error("Unknown message %d", type); | |
1021 | break; | |
1022 | } | |
f5799ae1 | 1023 | /* discard the remaining bytes from the current packet */ |
1024 | if (buf_len < buffer_len(&iqueue)) | |
1025 | fatal("iqueue grows"); | |
1026 | consumed = buf_len - buffer_len(&iqueue); | |
1027 | if (msg_len < consumed) | |
1028 | fatal("msg_len %d < consumed %d", msg_len, consumed); | |
1029 | if (msg_len > consumed) | |
1030 | buffer_consume(&iqueue, msg_len - consumed); | |
3c0ef626 | 1031 | } |
1032 | ||
1033 | int | |
1034 | main(int ac, char **av) | |
1035 | { | |
1036 | fd_set *rset, *wset; | |
1037 | int in, out, max; | |
1038 | ssize_t len, olen, set_size; | |
1039 | ||
2c06c99b | 1040 | /* Ensure that fds 0, 1 and 2 are open or directed to /dev/null */ |
1041 | sanitise_stdfd(); | |
1042 | ||
3c0ef626 | 1043 | /* XXX should use getopt */ |
1044 | ||
0fff78ff | 1045 | __progname = ssh_get_progname(av[0]); |
3c0ef626 | 1046 | handle_init(); |
1047 | ||
1048 | #ifdef DEBUG_SFTP_SERVER | |
1049 | log_init("sftp-server", SYSLOG_LEVEL_DEBUG1, SYSLOG_FACILITY_AUTH, 0); | |
1050 | #endif | |
1051 | ||
1052 | in = dup(STDIN_FILENO); | |
1053 | out = dup(STDOUT_FILENO); | |
1054 | ||
1055 | #ifdef HAVE_CYGWIN | |
1056 | setmode(in, O_BINARY); | |
1057 | setmode(out, O_BINARY); | |
1058 | #endif | |
1059 | ||
1060 | max = 0; | |
1061 | if (in > max) | |
1062 | max = in; | |
1063 | if (out > max) | |
1064 | max = out; | |
1065 | ||
1066 | buffer_init(&iqueue); | |
1067 | buffer_init(&oqueue); | |
1068 | ||
1069 | set_size = howmany(max + 1, NFDBITS) * sizeof(fd_mask); | |
1070 | rset = (fd_set *)xmalloc(set_size); | |
1071 | wset = (fd_set *)xmalloc(set_size); | |
1072 | ||
1073 | for (;;) { | |
1074 | memset(rset, 0, set_size); | |
1075 | memset(wset, 0, set_size); | |
1076 | ||
1077 | FD_SET(in, rset); | |
1078 | olen = buffer_len(&oqueue); | |
1079 | if (olen > 0) | |
1080 | FD_SET(out, wset); | |
1081 | ||
1082 | if (select(max+1, rset, wset, NULL, NULL) < 0) { | |
1083 | if (errno == EINTR) | |
1084 | continue; | |
1085 | exit(2); | |
1086 | } | |
1087 | ||
1088 | /* copy stdin to iqueue */ | |
1089 | if (FD_ISSET(in, rset)) { | |
1090 | char buf[4*4096]; | |
1091 | len = read(in, buf, sizeof buf); | |
1092 | if (len == 0) { | |
1093 | debug("read eof"); | |
1094 | exit(0); | |
1095 | } else if (len < 0) { | |
1096 | error("read error"); | |
1097 | exit(1); | |
1098 | } else { | |
1099 | buffer_append(&iqueue, buf, len); | |
1100 | } | |
1101 | } | |
1102 | /* send oqueue to stdout */ | |
1103 | if (FD_ISSET(out, wset)) { | |
1104 | len = write(out, buffer_ptr(&oqueue), olen); | |
1105 | if (len < 0) { | |
1106 | error("write error"); | |
1107 | exit(1); | |
1108 | } else { | |
1109 | buffer_consume(&oqueue, len); | |
1110 | } | |
1111 | } | |
1112 | /* process requests from client */ | |
1113 | process(); | |
1114 | } | |
1115 | } |