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1 | /* $OpenBSD: sftp-server.c,v 1.89 2010/01/04 02:25:15 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 || errno == ENOSYS | |
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 [-eh] [-f log_facility] [-l log_level] [-u umask]\n", | |
1326 | __progname); | |
1327 | exit(1); | |
1328 | } | |
1329 | ||
1330 | int | |
1331 | sftp_server_main(int argc, char **argv, struct passwd *user_pw) | |
1332 | { | |
1333 | fd_set *rset, *wset; | |
1334 | int in, out, max, ch, skipargs = 0, log_stderr = 0; | |
1335 | ssize_t len, olen, set_size; | |
1336 | SyslogFacility log_facility = SYSLOG_FACILITY_AUTH; | |
1337 | char *cp, buf[4*4096]; | |
1338 | const char *errmsg; | |
1339 | mode_t mask; | |
1340 | ||
1341 | extern char *optarg; | |
1342 | extern char *__progname; | |
1343 | ||
1344 | __progname = ssh_get_progname(argv[0]); | |
1345 | log_init(__progname, log_level, log_facility, log_stderr); | |
1346 | ||
1347 | while (!skipargs && (ch = getopt(argc, argv, "f:l:u:che")) != -1) { | |
1348 | switch (ch) { | |
1349 | case 'c': | |
1350 | /* | |
1351 | * Ignore all arguments if we are invoked as a | |
1352 | * shell using "sftp-server -c command" | |
1353 | */ | |
1354 | skipargs = 1; | |
1355 | break; | |
1356 | case 'e': | |
1357 | log_stderr = 1; | |
1358 | break; | |
1359 | case 'l': | |
1360 | log_level = log_level_number(optarg); | |
1361 | if (log_level == SYSLOG_LEVEL_NOT_SET) | |
1362 | error("Invalid log level \"%s\"", optarg); | |
1363 | break; | |
1364 | case 'f': | |
1365 | log_facility = log_facility_number(optarg); | |
1366 | if (log_facility == SYSLOG_FACILITY_NOT_SET) | |
1367 | error("Invalid log facility \"%s\"", optarg); | |
1368 | break; | |
1369 | case 'u': | |
1370 | mask = (mode_t)strtonum(optarg, 0, 0777, &errmsg); | |
1371 | if (errmsg != NULL) | |
1372 | fatal("Invalid umask \"%s\": %s", | |
1373 | optarg, errmsg); | |
1374 | (void)umask(mask); | |
1375 | break; | |
1376 | case 'h': | |
1377 | default: | |
1378 | sftp_server_usage(); | |
1379 | } | |
1380 | } | |
1381 | ||
1382 | log_init(__progname, log_level, log_facility, log_stderr); | |
1383 | ||
1384 | if ((cp = getenv("SSH_CONNECTION")) != NULL) { | |
1385 | client_addr = xstrdup(cp); | |
1386 | if ((cp = strchr(client_addr, ' ')) == NULL) { | |
1387 | error("Malformed SSH_CONNECTION variable: \"%s\"", | |
1388 | getenv("SSH_CONNECTION")); | |
1389 | sftp_server_cleanup_exit(255); | |
1390 | } | |
1391 | *cp = '\0'; | |
1392 | } else | |
1393 | client_addr = xstrdup("UNKNOWN"); | |
1394 | ||
1395 | pw = pwcopy(user_pw); | |
1396 | ||
1397 | logit("session opened for local user %s from [%s]", | |
1398 | pw->pw_name, client_addr); | |
1399 | ||
1400 | in = STDIN_FILENO; | |
1401 | out = STDOUT_FILENO; | |
1402 | ||
1403 | #ifdef HAVE_CYGWIN | |
1404 | setmode(in, O_BINARY); | |
1405 | setmode(out, O_BINARY); | |
1406 | #endif | |
1407 | ||
1408 | max = 0; | |
1409 | if (in > max) | |
1410 | max = in; | |
1411 | if (out > max) | |
1412 | max = out; | |
1413 | ||
1414 | buffer_init(&iqueue); | |
1415 | buffer_init(&oqueue); | |
1416 | ||
1417 | set_size = howmany(max + 1, NFDBITS) * sizeof(fd_mask); | |
1418 | rset = (fd_set *)xmalloc(set_size); | |
1419 | wset = (fd_set *)xmalloc(set_size); | |
1420 | ||
1421 | for (;;) { | |
1422 | memset(rset, 0, set_size); | |
1423 | memset(wset, 0, set_size); | |
1424 | ||
1425 | /* | |
1426 | * Ensure that we can read a full buffer and handle | |
1427 | * the worst-case length packet it can generate, | |
1428 | * otherwise apply backpressure by stopping reads. | |
1429 | */ | |
1430 | if (buffer_check_alloc(&iqueue, sizeof(buf)) && | |
1431 | buffer_check_alloc(&oqueue, SFTP_MAX_MSG_LENGTH)) | |
1432 | FD_SET(in, rset); | |
1433 | ||
1434 | olen = buffer_len(&oqueue); | |
1435 | if (olen > 0) | |
1436 | FD_SET(out, wset); | |
1437 | ||
1438 | if (select(max+1, rset, wset, NULL, NULL) < 0) { | |
1439 | if (errno == EINTR) | |
1440 | continue; | |
1441 | error("select: %s", strerror(errno)); | |
1442 | sftp_server_cleanup_exit(2); | |
1443 | } | |
1444 | ||
1445 | /* copy stdin to iqueue */ | |
1446 | if (FD_ISSET(in, rset)) { | |
1447 | len = read(in, buf, sizeof buf); | |
1448 | if (len == 0) { | |
1449 | debug("read eof"); | |
1450 | sftp_server_cleanup_exit(0); | |
1451 | } else if (len < 0) { | |
1452 | error("read: %s", strerror(errno)); | |
1453 | sftp_server_cleanup_exit(1); | |
1454 | } else { | |
1455 | buffer_append(&iqueue, buf, len); | |
1456 | } | |
1457 | } | |
1458 | /* send oqueue to stdout */ | |
1459 | if (FD_ISSET(out, wset)) { | |
1460 | len = write(out, buffer_ptr(&oqueue), olen); | |
1461 | if (len < 0) { | |
1462 | error("write: %s", strerror(errno)); | |
1463 | sftp_server_cleanup_exit(1); | |
1464 | } else { | |
1465 | buffer_consume(&oqueue, len); | |
1466 | } | |
1467 | } | |
1468 | ||
1469 | /* | |
1470 | * Process requests from client if we can fit the results | |
1471 | * into the output buffer, otherwise stop processing input | |
1472 | * and let the output queue drain. | |
1473 | */ | |
1474 | if (buffer_check_alloc(&oqueue, SFTP_MAX_MSG_LENGTH)) | |
1475 | process(); | |
1476 | } | |
1477 | } |