1 /* $OpenBSD: sftp-server.c,v 1.91 2010/01/13 01:40:16 djm Exp $ */
3 * Copyright (c) 2000-2004 Markus Friedl. All rights reserved.
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.
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.
20 #include <sys/types.h>
21 #include <sys/param.h>
23 #ifdef HAVE_SYS_TIME_H
24 # include <sys/time.h>
26 #ifdef HAVE_SYS_MOUNT_H
27 #include <sys/mount.h>
29 #ifdef HAVE_SYS_STATVFS_H
30 #include <sys/statvfs.h>
52 #include "sftp-common.h"
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);
60 LogLevel log_level = SYSLOG_LEVEL_ERROR;
63 struct passwd *pw = NULL;
64 char *client_addr = NULL;
66 /* input and output queue */
70 /* Version of client */
76 /* portable attributes, etc. */
78 typedef struct Stat Stat;
87 errno_to_portable(int unixerrno)
99 ret = SSH2_FX_NO_SUCH_FILE;
104 ret = SSH2_FX_PERMISSION_DENIED;
108 ret = SSH2_FX_BAD_MESSAGE;
111 ret = SSH2_FX_OP_UNSUPPORTED;
114 ret = SSH2_FX_FAILURE;
121 flags_from_portable(int pflags)
125 if ((pflags & SSH2_FXF_READ) &&
126 (pflags & SSH2_FXF_WRITE)) {
128 } else if (pflags & SSH2_FXF_READ) {
130 } else if (pflags & SSH2_FXF_WRITE) {
133 if (pflags & SSH2_FXF_CREAT)
135 if (pflags & SSH2_FXF_TRUNC)
137 if (pflags & SSH2_FXF_EXCL)
143 string_from_portable(int pflags)
145 static char ret[128];
149 #define PAPPEND(str) { \
151 strlcat(ret, ",", sizeof(ret)); \
152 strlcat(ret, str, sizeof(ret)); \
155 if (pflags & SSH2_FXF_READ)
157 if (pflags & SSH2_FXF_WRITE)
159 if (pflags & SSH2_FXF_CREAT)
161 if (pflags & SSH2_FXF_TRUNC)
163 if (pflags & SSH2_FXF_EXCL)
172 return decode_attrib(&iqueue);
177 typedef struct Handle Handle;
183 u_int64_t bytes_read, bytes_write;
193 Handle *handles = NULL;
194 u_int num_handles = 0;
195 int first_unused_handle = -1;
197 static void handle_unused(int i)
199 handles[i].use = HANDLE_UNUSED;
200 handles[i].next_unused = first_unused_handle;
201 first_unused_handle = i;
205 handle_new(int use, const char *name, int fd, DIR *dirp)
209 if (first_unused_handle == -1) {
210 if (num_handles + 1 <= num_handles)
213 handles = xrealloc(handles, num_handles, sizeof(Handle));
214 handle_unused(num_handles - 1);
217 i = first_unused_handle;
218 first_unused_handle = handles[i].next_unused;
220 handles[i].use = use;
221 handles[i].dirp = dirp;
223 handles[i].name = xstrdup(name);
224 handles[i].bytes_read = handles[i].bytes_write = 0;
230 handle_is_ok(int i, int type)
232 return i >= 0 && (u_int)i < num_handles && handles[i].use == type;
236 handle_to_string(int handle, char **stringp, int *hlenp)
238 if (stringp == NULL || hlenp == NULL)
240 *stringp = xmalloc(sizeof(int32_t));
241 put_u32(*stringp, handle);
242 *hlenp = sizeof(int32_t);
247 handle_from_string(const char *handle, u_int hlen)
251 if (hlen != sizeof(int32_t))
253 val = get_u32(handle);
254 if (handle_is_ok(val, HANDLE_FILE) ||
255 handle_is_ok(val, HANDLE_DIR))
261 handle_to_name(int handle)
263 if (handle_is_ok(handle, HANDLE_DIR)||
264 handle_is_ok(handle, HANDLE_FILE))
265 return handles[handle].name;
270 handle_to_dir(int handle)
272 if (handle_is_ok(handle, HANDLE_DIR))
273 return handles[handle].dirp;
278 handle_to_fd(int handle)
280 if (handle_is_ok(handle, HANDLE_FILE))
281 return handles[handle].fd;
286 handle_update_read(int handle, ssize_t bytes)
288 if (handle_is_ok(handle, HANDLE_FILE) && bytes > 0)
289 handles[handle].bytes_read += bytes;
293 handle_update_write(int handle, ssize_t bytes)
295 if (handle_is_ok(handle, HANDLE_FILE) && bytes > 0)
296 handles[handle].bytes_write += bytes;
300 handle_bytes_read(int handle)
302 if (handle_is_ok(handle, HANDLE_FILE))
303 return (handles[handle].bytes_read);
308 handle_bytes_write(int handle)
310 if (handle_is_ok(handle, HANDLE_FILE))
311 return (handles[handle].bytes_write);
316 handle_close(int handle)
320 if (handle_is_ok(handle, HANDLE_FILE)) {
321 ret = close(handles[handle].fd);
322 xfree(handles[handle].name);
323 handle_unused(handle);
324 } else if (handle_is_ok(handle, HANDLE_DIR)) {
325 ret = closedir(handles[handle].dirp);
326 xfree(handles[handle].name);
327 handle_unused(handle);
335 handle_log_close(int handle, char *emsg)
337 if (handle_is_ok(handle, HANDLE_FILE)) {
338 logit("%s%sclose \"%s\" bytes read %llu written %llu",
339 emsg == NULL ? "" : emsg, emsg == NULL ? "" : " ",
340 handle_to_name(handle),
341 (unsigned long long)handle_bytes_read(handle),
342 (unsigned long long)handle_bytes_write(handle));
344 logit("%s%sclosedir \"%s\"",
345 emsg == NULL ? "" : emsg, emsg == NULL ? "" : " ",
346 handle_to_name(handle));
351 handle_log_exit(void)
355 for (i = 0; i < num_handles; i++)
356 if (handles[i].use != HANDLE_UNUSED)
357 handle_log_close(i, "forced");
367 handle = get_string(&hlen);
369 val = handle_from_string(handle, hlen);
379 int mlen = buffer_len(m);
381 buffer_put_int(&oqueue, mlen);
382 buffer_append(&oqueue, buffer_ptr(m), mlen);
383 buffer_consume(m, mlen);
387 status_to_message(u_int32_t status)
389 const char *status_messages[] = {
390 "Success", /* SSH_FX_OK */
391 "End of file", /* SSH_FX_EOF */
392 "No such file", /* SSH_FX_NO_SUCH_FILE */
393 "Permission denied", /* SSH_FX_PERMISSION_DENIED */
394 "Failure", /* SSH_FX_FAILURE */
395 "Bad message", /* SSH_FX_BAD_MESSAGE */
396 "No connection", /* SSH_FX_NO_CONNECTION */
397 "Connection lost", /* SSH_FX_CONNECTION_LOST */
398 "Operation unsupported", /* SSH_FX_OP_UNSUPPORTED */
399 "Unknown error" /* Others */
401 return (status_messages[MIN(status,SSH2_FX_MAX)]);
405 send_status(u_int32_t id, u_int32_t status)
409 debug3("request %u: sent status %u", id, status);
410 if (log_level > SYSLOG_LEVEL_VERBOSE ||
411 (status != SSH2_FX_OK && status != SSH2_FX_EOF))
412 logit("sent status %s", status_to_message(status));
414 buffer_put_char(&msg, SSH2_FXP_STATUS);
415 buffer_put_int(&msg, id);
416 buffer_put_int(&msg, status);
418 buffer_put_cstring(&msg, status_to_message(status));
419 buffer_put_cstring(&msg, "");
425 send_data_or_handle(char type, u_int32_t id, const char *data, int dlen)
430 buffer_put_char(&msg, type);
431 buffer_put_int(&msg, id);
432 buffer_put_string(&msg, data, dlen);
438 send_data(u_int32_t id, const char *data, int dlen)
440 debug("request %u: sent data len %d", id, dlen);
441 send_data_or_handle(SSH2_FXP_DATA, id, data, dlen);
445 send_handle(u_int32_t id, int handle)
450 handle_to_string(handle, &string, &hlen);
451 debug("request %u: sent handle handle %d", id, handle);
452 send_data_or_handle(SSH2_FXP_HANDLE, id, string, hlen);
457 send_names(u_int32_t id, int count, const Stat *stats)
463 buffer_put_char(&msg, SSH2_FXP_NAME);
464 buffer_put_int(&msg, id);
465 buffer_put_int(&msg, count);
466 debug("request %u: sent names count %d", id, count);
467 for (i = 0; i < count; i++) {
468 buffer_put_cstring(&msg, stats[i].name);
469 buffer_put_cstring(&msg, stats[i].long_name);
470 encode_attrib(&msg, &stats[i].attrib);
477 send_attrib(u_int32_t id, const Attrib *a)
481 debug("request %u: sent attrib have 0x%x", id, a->flags);
483 buffer_put_char(&msg, SSH2_FXP_ATTRS);
484 buffer_put_int(&msg, id);
485 encode_attrib(&msg, a);
491 send_statvfs(u_int32_t id, struct statvfs *st)
496 flag = (st->f_flag & ST_RDONLY) ? SSH2_FXE_STATVFS_ST_RDONLY : 0;
497 flag |= (st->f_flag & ST_NOSUID) ? SSH2_FXE_STATVFS_ST_NOSUID : 0;
500 buffer_put_char(&msg, SSH2_FXP_EXTENDED_REPLY);
501 buffer_put_int(&msg, id);
502 buffer_put_int64(&msg, st->f_bsize);
503 buffer_put_int64(&msg, st->f_frsize);
504 buffer_put_int64(&msg, st->f_blocks);
505 buffer_put_int64(&msg, st->f_bfree);
506 buffer_put_int64(&msg, st->f_bavail);
507 buffer_put_int64(&msg, st->f_files);
508 buffer_put_int64(&msg, st->f_ffree);
509 buffer_put_int64(&msg, st->f_favail);
510 buffer_put_int64(&msg, FSID_TO_ULONG(st->f_fsid));
511 buffer_put_int64(&msg, flag);
512 buffer_put_int64(&msg, st->f_namemax);
525 verbose("received client version %d", version);
527 buffer_put_char(&msg, SSH2_FXP_VERSION);
528 buffer_put_int(&msg, SSH2_FILEXFER_VERSION);
529 /* POSIX rename extension */
530 buffer_put_cstring(&msg, "posix-rename@openssh.com");
531 buffer_put_cstring(&msg, "1"); /* version */
532 /* statvfs extension */
533 buffer_put_cstring(&msg, "statvfs@openssh.com");
534 buffer_put_cstring(&msg, "2"); /* version */
535 /* fstatvfs extension */
536 buffer_put_cstring(&msg, "fstatvfs@openssh.com");
537 buffer_put_cstring(&msg, "2"); /* version */
545 u_int32_t id, pflags;
548 int handle, fd, flags, mode, status = SSH2_FX_FAILURE;
551 name = get_string(NULL);
552 pflags = get_int(); /* portable flags */
553 debug3("request %u: open flags %d", id, pflags);
555 flags = flags_from_portable(pflags);
556 mode = (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ? a->perm : 0666;
557 logit("open \"%s\" flags %s mode 0%o",
558 name, string_from_portable(pflags), mode);
560 ((flags & O_ACCMODE) == O_WRONLY || (flags & O_ACCMODE) == O_RDWR))
561 status = SSH2_FX_PERMISSION_DENIED;
563 fd = open(name, flags, mode);
565 status = errno_to_portable(errno);
567 handle = handle_new(HANDLE_FILE, name, fd, NULL);
571 send_handle(id, handle);
576 if (status != SSH2_FX_OK)
577 send_status(id, status);
585 int handle, ret, status = SSH2_FX_FAILURE;
588 handle = get_handle();
589 debug3("request %u: close handle %u", id, handle);
590 handle_log_close(handle, NULL);
591 ret = handle_close(handle);
592 status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
593 send_status(id, status);
601 int handle, fd, ret, status = SSH2_FX_FAILURE;
605 handle = get_handle();
609 debug("request %u: read \"%s\" (handle %d) off %llu len %d",
610 id, handle_to_name(handle), handle, (unsigned long long)off, len);
611 if (len > sizeof buf) {
613 debug2("read change len %d", len);
615 fd = handle_to_fd(handle);
617 if (lseek(fd, off, SEEK_SET) < 0) {
618 error("process_read: seek failed");
619 status = errno_to_portable(errno);
621 ret = read(fd, buf, len);
623 status = errno_to_portable(errno);
624 } else if (ret == 0) {
625 status = SSH2_FX_EOF;
627 send_data(id, buf, ret);
629 handle_update_read(handle, ret);
633 if (status != SSH2_FX_OK)
634 send_status(id, status);
643 int handle, fd, ret, status;
647 handle = get_handle();
649 data = get_string(&len);
651 debug("request %u: write \"%s\" (handle %d) off %llu len %d",
652 id, handle_to_name(handle), handle, (unsigned long long)off, len);
653 fd = handle_to_fd(handle);
656 status = SSH2_FX_FAILURE;
658 status = SSH2_FX_PERMISSION_DENIED;
660 if (lseek(fd, off, SEEK_SET) < 0) {
661 status = errno_to_portable(errno);
662 error("process_write: seek failed");
665 ret = write(fd, data, len);
667 error("process_write: write failed");
668 status = errno_to_portable(errno);
669 } else if ((size_t)ret == len) {
671 handle_update_write(handle, ret);
673 debug2("nothing at all written");
674 status = SSH2_FX_FAILURE;
678 send_status(id, status);
683 process_do_stat(int do_lstat)
689 int ret, status = SSH2_FX_FAILURE;
692 name = get_string(NULL);
693 debug3("request %u: %sstat", id, do_lstat ? "l" : "");
694 verbose("%sstat name \"%s\"", do_lstat ? "l" : "", name);
695 ret = do_lstat ? lstat(name, &st) : stat(name, &st);
697 status = errno_to_portable(errno);
699 stat_to_attrib(&st, &a);
703 if (status != SSH2_FX_OK)
704 send_status(id, status);
726 int fd, ret, handle, status = SSH2_FX_FAILURE;
729 handle = get_handle();
730 debug("request %u: fstat \"%s\" (handle %u)",
731 id, handle_to_name(handle), handle);
732 fd = handle_to_fd(handle);
734 ret = fstat(fd, &st);
736 status = errno_to_portable(errno);
738 stat_to_attrib(&st, &a);
743 if (status != SSH2_FX_OK)
744 send_status(id, status);
747 static struct timeval *
748 attrib_to_tv(const Attrib *a)
750 static struct timeval tv[2];
752 tv[0].tv_sec = a->atime;
754 tv[1].tv_sec = a->mtime;
760 process_setstat(void)
765 int status = SSH2_FX_OK, ret;
768 name = get_string(NULL);
770 debug("request %u: setstat name \"%s\"", id, name);
772 status = SSH2_FX_PERMISSION_DENIED;
775 if (a->flags & SSH2_FILEXFER_ATTR_SIZE) {
776 logit("set \"%s\" size %llu",
777 name, (unsigned long long)a->size);
778 ret = truncate(name, a->size);
780 status = errno_to_portable(errno);
782 if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
783 logit("set \"%s\" mode %04o", name, a->perm);
784 ret = chmod(name, a->perm & 07777);
786 status = errno_to_portable(errno);
788 if (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
792 strftime(buf, sizeof(buf), "%Y%m%d-%H:%M:%S",
794 logit("set \"%s\" modtime %s", name, buf);
795 ret = utimes(name, attrib_to_tv(a));
797 status = errno_to_portable(errno);
799 if (a->flags & SSH2_FILEXFER_ATTR_UIDGID) {
800 logit("set \"%s\" owner %lu group %lu", name,
801 (u_long)a->uid, (u_long)a->gid);
802 ret = chown(name, a->uid, a->gid);
804 status = errno_to_portable(errno);
806 send_status(id, status);
811 process_fsetstat(void)
816 int status = SSH2_FX_OK;
819 handle = get_handle();
821 debug("request %u: fsetstat handle %d", id, handle);
822 fd = handle_to_fd(handle);
824 status = SSH2_FX_FAILURE;
826 status = SSH2_FX_PERMISSION_DENIED;
828 char *name = handle_to_name(handle);
830 if (a->flags & SSH2_FILEXFER_ATTR_SIZE) {
831 logit("set \"%s\" size %llu",
832 name, (unsigned long long)a->size);
833 ret = ftruncate(fd, a->size);
835 status = errno_to_portable(errno);
837 if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
838 logit("set \"%s\" mode %04o", name, a->perm);
840 ret = fchmod(fd, a->perm & 07777);
842 ret = chmod(name, a->perm & 07777);
845 status = errno_to_portable(errno);
847 if (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
851 strftime(buf, sizeof(buf), "%Y%m%d-%H:%M:%S",
853 logit("set \"%s\" modtime %s", name, buf);
855 ret = futimes(fd, attrib_to_tv(a));
857 ret = utimes(name, attrib_to_tv(a));
860 status = errno_to_portable(errno);
862 if (a->flags & SSH2_FILEXFER_ATTR_UIDGID) {
863 logit("set \"%s\" owner %lu group %lu", name,
864 (u_long)a->uid, (u_long)a->gid);
866 ret = fchown(fd, a->uid, a->gid);
868 ret = chown(name, a->uid, a->gid);
871 status = errno_to_portable(errno);
874 send_status(id, status);
878 process_opendir(void)
882 int handle, status = SSH2_FX_FAILURE;
886 path = get_string(NULL);
887 debug3("request %u: opendir", id);
888 logit("opendir \"%s\"", path);
889 dirp = opendir(path);
891 status = errno_to_portable(errno);
893 handle = handle_new(HANDLE_DIR, path, 0, dirp);
897 send_handle(id, handle);
902 if (status != SSH2_FX_OK)
903 send_status(id, status);
908 process_readdir(void)
917 handle = get_handle();
918 debug("request %u: readdir \"%s\" (handle %d)", id,
919 handle_to_name(handle), handle);
920 dirp = handle_to_dir(handle);
921 path = handle_to_name(handle);
922 if (dirp == NULL || path == NULL) {
923 send_status(id, SSH2_FX_FAILURE);
926 char pathname[MAXPATHLEN];
928 int nstats = 10, count = 0, i;
930 stats = xcalloc(nstats, sizeof(Stat));
931 while ((dp = readdir(dirp)) != NULL) {
932 if (count >= nstats) {
934 stats = xrealloc(stats, nstats, sizeof(Stat));
937 snprintf(pathname, sizeof pathname, "%s%s%s", path,
938 strcmp(path, "/") ? "/" : "", dp->d_name);
939 if (lstat(pathname, &st) < 0)
941 stat_to_attrib(&st, &(stats[count].attrib));
942 stats[count].name = xstrdup(dp->d_name);
943 stats[count].long_name = ls_file(dp->d_name, &st, 0, 0);
945 /* send up to 100 entries in one message */
946 /* XXX check packet size instead */
951 send_names(id, count, stats);
952 for (i = 0; i < count; i++) {
953 xfree(stats[i].name);
954 xfree(stats[i].long_name);
957 send_status(id, SSH2_FX_EOF);
968 int status = SSH2_FX_FAILURE;
972 name = get_string(NULL);
973 debug3("request %u: remove", id);
974 logit("remove name \"%s\"", name);
976 status = SSH2_FX_PERMISSION_DENIED;
979 status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
981 send_status(id, status);
991 int ret, mode, status = SSH2_FX_FAILURE;
994 name = get_string(NULL);
996 mode = (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ?
997 a->perm & 07777 : 0777;
998 debug3("request %u: mkdir", id);
999 logit("mkdir name \"%s\" mode 0%o", name, mode);
1001 status = SSH2_FX_PERMISSION_DENIED;
1003 ret = mkdir(name, mode);
1004 status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1006 send_status(id, status);
1018 name = get_string(NULL);
1019 debug3("request %u: rmdir", id);
1020 logit("rmdir name \"%s\"", name);
1022 status = SSH2_FX_PERMISSION_DENIED;
1025 status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1027 send_status(id, status);
1032 process_realpath(void)
1034 char resolvedname[MAXPATHLEN];
1039 path = get_string(NULL);
1040 if (path[0] == '\0') {
1042 path = xstrdup(".");
1044 debug3("request %u: realpath", id);
1045 verbose("realpath \"%s\"", path);
1046 if (realpath(path, resolvedname) == NULL) {
1047 send_status(id, errno_to_portable(errno));
1050 attrib_clear(&s.attrib);
1051 s.name = s.long_name = resolvedname;
1052 send_names(id, 1, &s);
1058 process_rename(void)
1061 char *oldpath, *newpath;
1066 oldpath = get_string(NULL);
1067 newpath = get_string(NULL);
1068 debug3("request %u: rename", id);
1069 logit("rename old \"%s\" new \"%s\"", oldpath, newpath);
1070 status = SSH2_FX_FAILURE;
1072 status = SSH2_FX_PERMISSION_DENIED;
1073 else if (lstat(oldpath, &sb) == -1)
1074 status = errno_to_portable(errno);
1075 else if (S_ISREG(sb.st_mode)) {
1076 /* Race-free rename of regular files */
1077 if (link(oldpath, newpath) == -1) {
1078 if (errno == EOPNOTSUPP || errno == ENOSYS
1082 #ifdef LINK_OPNOTSUPP_ERRNO
1083 || errno == LINK_OPNOTSUPP_ERRNO
1089 * fs doesn't support links, so fall back to
1090 * stat+rename. This is racy.
1092 if (stat(newpath, &st) == -1) {
1093 if (rename(oldpath, newpath) == -1)
1095 errno_to_portable(errno);
1097 status = SSH2_FX_OK;
1100 status = errno_to_portable(errno);
1102 } else if (unlink(oldpath) == -1) {
1103 status = errno_to_portable(errno);
1104 /* clean spare link */
1107 status = SSH2_FX_OK;
1108 } else if (stat(newpath, &sb) == -1) {
1109 if (rename(oldpath, newpath) == -1)
1110 status = errno_to_portable(errno);
1112 status = SSH2_FX_OK;
1114 send_status(id, status);
1120 process_readlink(void)
1124 char buf[MAXPATHLEN];
1128 path = get_string(NULL);
1129 debug3("request %u: readlink", id);
1130 verbose("readlink \"%s\"", path);
1131 if ((len = readlink(path, buf, sizeof(buf) - 1)) == -1)
1132 send_status(id, errno_to_portable(errno));
1137 attrib_clear(&s.attrib);
1138 s.name = s.long_name = buf;
1139 send_names(id, 1, &s);
1145 process_symlink(void)
1148 char *oldpath, *newpath;
1152 oldpath = get_string(NULL);
1153 newpath = get_string(NULL);
1154 debug3("request %u: symlink", id);
1155 logit("symlink old \"%s\" new \"%s\"", oldpath, newpath);
1156 /* this will fail if 'newpath' exists */
1158 status = SSH2_FX_PERMISSION_DENIED;
1160 ret = symlink(oldpath, newpath);
1161 status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1163 send_status(id, status);
1169 process_extended_posix_rename(u_int32_t id)
1171 char *oldpath, *newpath;
1174 oldpath = get_string(NULL);
1175 newpath = get_string(NULL);
1176 debug3("request %u: posix-rename", id);
1177 logit("posix-rename old \"%s\" new \"%s\"", oldpath, newpath);
1179 status = SSH2_FX_PERMISSION_DENIED;
1181 ret = rename(oldpath, newpath);
1182 status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1184 send_status(id, status);
1190 process_extended_statvfs(u_int32_t id)
1195 path = get_string(NULL);
1196 debug3("request %u: statfs", id);
1197 logit("statfs \"%s\"", path);
1199 if (statvfs(path, &st) != 0)
1200 send_status(id, errno_to_portable(errno));
1202 send_statvfs(id, &st);
1207 process_extended_fstatvfs(u_int32_t id)
1212 handle = get_handle();
1213 debug("request %u: fstatvfs \"%s\" (handle %u)",
1214 id, handle_to_name(handle), handle);
1215 if ((fd = handle_to_fd(handle)) < 0) {
1216 send_status(id, SSH2_FX_FAILURE);
1219 if (fstatvfs(fd, &st) != 0)
1220 send_status(id, errno_to_portable(errno));
1222 send_statvfs(id, &st);
1226 process_extended(void)
1232 request = get_string(NULL);
1233 if (strcmp(request, "posix-rename@openssh.com") == 0)
1234 process_extended_posix_rename(id);
1235 else if (strcmp(request, "statvfs@openssh.com") == 0)
1236 process_extended_statvfs(id);
1237 else if (strcmp(request, "fstatvfs@openssh.com") == 0)
1238 process_extended_fstatvfs(id);
1240 send_status(id, SSH2_FX_OP_UNSUPPORTED); /* MUST */
1244 /* stolen from ssh-agent */
1255 buf_len = buffer_len(&iqueue);
1257 return; /* Incomplete message. */
1258 cp = buffer_ptr(&iqueue);
1259 msg_len = get_u32(cp);
1260 if (msg_len > SFTP_MAX_MSG_LENGTH) {
1261 error("bad message from %s local user %s",
1262 client_addr, pw->pw_name);
1263 sftp_server_cleanup_exit(11);
1265 if (buf_len < msg_len + 4)
1267 buffer_consume(&iqueue, 4);
1269 type = buffer_get_char(&iqueue);
1277 case SSH2_FXP_CLOSE:
1283 case SSH2_FXP_WRITE:
1286 case SSH2_FXP_LSTAT:
1289 case SSH2_FXP_FSTAT:
1292 case SSH2_FXP_SETSTAT:
1295 case SSH2_FXP_FSETSTAT:
1298 case SSH2_FXP_OPENDIR:
1301 case SSH2_FXP_READDIR:
1304 case SSH2_FXP_REMOVE:
1307 case SSH2_FXP_MKDIR:
1310 case SSH2_FXP_RMDIR:
1313 case SSH2_FXP_REALPATH:
1319 case SSH2_FXP_RENAME:
1322 case SSH2_FXP_READLINK:
1325 case SSH2_FXP_SYMLINK:
1328 case SSH2_FXP_EXTENDED:
1332 error("Unknown message %d", type);
1335 /* discard the remaining bytes from the current packet */
1336 if (buf_len < buffer_len(&iqueue)) {
1337 error("iqueue grew unexpectedly");
1338 sftp_server_cleanup_exit(255);
1340 consumed = buf_len - buffer_len(&iqueue);
1341 if (msg_len < consumed) {
1342 error("msg_len %d < consumed %d", msg_len, consumed);
1343 sftp_server_cleanup_exit(255);
1345 if (msg_len > consumed)
1346 buffer_consume(&iqueue, msg_len - consumed);
1349 /* Cleanup handler that logs active handles upon normal exit */
1351 sftp_server_cleanup_exit(int i)
1353 if (pw != NULL && client_addr != NULL) {
1355 logit("session closed for local user %s from [%s]",
1356 pw->pw_name, client_addr);
1362 sftp_server_usage(void)
1364 extern char *__progname;
1367 "usage: %s [-ehR] [-f log_facility] [-l log_level] [-u umask]\n",
1373 sftp_server_main(int argc, char **argv, struct passwd *user_pw)
1375 fd_set *rset, *wset;
1376 int in, out, max, ch, skipargs = 0, log_stderr = 0;
1377 ssize_t len, olen, set_size;
1378 SyslogFacility log_facility = SYSLOG_FACILITY_AUTH;
1379 char *cp, buf[4*4096];
1383 extern char *optarg;
1384 extern char *__progname;
1386 __progname = ssh_get_progname(argv[0]);
1387 log_init(__progname, log_level, log_facility, log_stderr);
1389 while (!skipargs && (ch = getopt(argc, argv, "f:l:u:cehR")) != -1) {
1396 * Ignore all arguments if we are invoked as a
1397 * shell using "sftp-server -c command"
1405 log_level = log_level_number(optarg);
1406 if (log_level == SYSLOG_LEVEL_NOT_SET)
1407 error("Invalid log level \"%s\"", optarg);
1410 log_facility = log_facility_number(optarg);
1411 if (log_facility == SYSLOG_FACILITY_NOT_SET)
1412 error("Invalid log facility \"%s\"", optarg);
1415 mask = (mode_t)strtonum(optarg, 0, 0777, &errmsg);
1417 fatal("Invalid umask \"%s\": %s",
1423 sftp_server_usage();
1427 log_init(__progname, log_level, log_facility, log_stderr);
1429 if ((cp = getenv("SSH_CONNECTION")) != NULL) {
1430 client_addr = xstrdup(cp);
1431 if ((cp = strchr(client_addr, ' ')) == NULL) {
1432 error("Malformed SSH_CONNECTION variable: \"%s\"",
1433 getenv("SSH_CONNECTION"));
1434 sftp_server_cleanup_exit(255);
1438 client_addr = xstrdup("UNKNOWN");
1440 pw = pwcopy(user_pw);
1442 logit("session opened for local user %s from [%s]",
1443 pw->pw_name, client_addr);
1446 out = STDOUT_FILENO;
1449 setmode(in, O_BINARY);
1450 setmode(out, O_BINARY);
1459 buffer_init(&iqueue);
1460 buffer_init(&oqueue);
1462 set_size = howmany(max + 1, NFDBITS) * sizeof(fd_mask);
1463 rset = (fd_set *)xmalloc(set_size);
1464 wset = (fd_set *)xmalloc(set_size);
1467 memset(rset, 0, set_size);
1468 memset(wset, 0, set_size);
1471 * Ensure that we can read a full buffer and handle
1472 * the worst-case length packet it can generate,
1473 * otherwise apply backpressure by stopping reads.
1475 if (buffer_check_alloc(&iqueue, sizeof(buf)) &&
1476 buffer_check_alloc(&oqueue, SFTP_MAX_MSG_LENGTH))
1479 olen = buffer_len(&oqueue);
1483 if (select(max+1, rset, wset, NULL, NULL) < 0) {
1486 error("select: %s", strerror(errno));
1487 sftp_server_cleanup_exit(2);
1490 /* copy stdin to iqueue */
1491 if (FD_ISSET(in, rset)) {
1492 len = read(in, buf, sizeof buf);
1495 sftp_server_cleanup_exit(0);
1496 } else if (len < 0) {
1497 error("read: %s", strerror(errno));
1498 sftp_server_cleanup_exit(1);
1500 buffer_append(&iqueue, buf, len);
1503 /* send oqueue to stdout */
1504 if (FD_ISSET(out, wset)) {
1505 len = write(out, buffer_ptr(&oqueue), olen);
1507 error("write: %s", strerror(errno));
1508 sftp_server_cleanup_exit(1);
1510 buffer_consume(&oqueue, len);
1515 * Process requests from client if we can fit the results
1516 * into the output buffer, otherwise stop processing input
1517 * and let the output queue drain.
1519 if (buffer_check_alloc(&oqueue, SFTP_MAX_MSG_LENGTH))