Annotation of src/usr.bin/ssh/sftp-server.c, Revision 1.122
1.122 ! djm 1: /* $OpenBSD: sftp-server.c,v 1.121 2021/02/12 03:49:09 djm Exp $ */
1.1 markus 2: /*
1.45 markus 3: * Copyright (c) 2000-2004 Markus Friedl. All rights reserved.
1.1 markus 4: *
1.45 markus 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.
1.1 markus 8: *
1.45 markus 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.
1.1 markus 16: */
1.52 stevesk 17:
18: #include <sys/types.h>
1.122 ! djm 19: #include <sys/resource.h>
1.52 stevesk 20: #include <sys/stat.h>
1.66 stevesk 21: #include <sys/time.h>
1.79 djm 22: #include <sys/mount.h>
23: #include <sys/statvfs.h>
1.51 stevesk 24:
25: #include <dirent.h>
1.62 stevesk 26: #include <errno.h>
1.59 stevesk 27: #include <fcntl.h>
1.68 stevesk 28: #include <stdlib.h>
1.69 stevesk 29: #include <stdio.h>
1.65 stevesk 30: #include <string.h>
1.70 deraadt 31: #include <pwd.h>
1.64 stevesk 32: #include <time.h>
1.63 stevesk 33: #include <unistd.h>
1.70 deraadt 34: #include <stdarg.h>
1.1 markus 35:
1.70 deraadt 36: #include "xmalloc.h"
1.104 djm 37: #include "sshbuf.h"
38: #include "ssherr.h"
1.14 markus 39: #include "log.h"
1.49 djm 40: #include "misc.h"
1.98 djm 41: #include "match.h"
1.58 djm 42: #include "uidswap.h"
1.1 markus 43:
1.10 markus 44: #include "sftp.h"
1.15 djm 45: #include "sftp-common.h"
1.1 markus 46:
1.117 djm 47: char *sftp_realpath(const char *, char *); /* sftp-realpath.c */
48:
1.122 ! djm 49: /* Maximum data read that we are willing to accept */
! 50: #define SFTP_MAX_READ_LENGTH (64 * 1024)
! 51:
1.58 djm 52: /* Our verbosity */
1.98 djm 53: static LogLevel log_level = SYSLOG_LEVEL_ERROR;
1.58 djm 54:
55: /* Our client */
1.98 djm 56: static struct passwd *pw = NULL;
57: static char *client_addr = NULL;
1.1 markus 58:
59: /* input and output queue */
1.104 djm 60: struct sshbuf *iqueue;
61: struct sshbuf *oqueue;
1.1 markus 62:
1.23 djm 63: /* Version of client */
1.98 djm 64: static u_int version;
65:
66: /* SSH2_FXP_INIT received */
67: static int init_done;
1.23 djm 68:
1.90 djm 69: /* Disable writes */
1.98 djm 70: static int readonly;
71:
72: /* Requests that are allowed/denied */
1.118 djm 73: static char *request_allowlist, *request_denylist;
1.90 djm 74:
1.43 miod 75: /* portable attributes, etc. */
1.1 markus 76: typedef struct Stat Stat;
77:
1.15 djm 78: struct Stat {
1.1 markus 79: char *name;
80: char *long_name;
81: Attrib attrib;
82: };
83:
1.98 djm 84: /* Packet handlers */
85: static void process_open(u_int32_t id);
86: static void process_close(u_int32_t id);
87: static void process_read(u_int32_t id);
88: static void process_write(u_int32_t id);
89: static void process_stat(u_int32_t id);
90: static void process_lstat(u_int32_t id);
91: static void process_fstat(u_int32_t id);
92: static void process_setstat(u_int32_t id);
93: static void process_fsetstat(u_int32_t id);
94: static void process_opendir(u_int32_t id);
95: static void process_readdir(u_int32_t id);
96: static void process_remove(u_int32_t id);
97: static void process_mkdir(u_int32_t id);
98: static void process_rmdir(u_int32_t id);
99: static void process_realpath(u_int32_t id);
100: static void process_rename(u_int32_t id);
101: static void process_readlink(u_int32_t id);
102: static void process_symlink(u_int32_t id);
103: static void process_extended_posix_rename(u_int32_t id);
104: static void process_extended_statvfs(u_int32_t id);
105: static void process_extended_fstatvfs(u_int32_t id);
106: static void process_extended_hardlink(u_int32_t id);
1.102 djm 107: static void process_extended_fsync(u_int32_t id);
1.114 djm 108: static void process_extended_lsetstat(u_int32_t id);
1.122 ! djm 109: static void process_extended_limits(u_int32_t id);
1.98 djm 110: static void process_extended(u_int32_t id);
111:
112: struct sftp_handler {
113: const char *name; /* user-visible name for fine-grained perms */
114: const char *ext_name; /* extended request name */
115: u_int type; /* packet type, for non extended packets */
116: void (*handler)(u_int32_t);
117: int does_write; /* if nonzero, banned for readonly mode */
118: };
119:
1.113 djm 120: static const struct sftp_handler handlers[] = {
1.98 djm 121: /* NB. SSH2_FXP_OPEN does the readonly check in the handler itself */
122: { "open", NULL, SSH2_FXP_OPEN, process_open, 0 },
123: { "close", NULL, SSH2_FXP_CLOSE, process_close, 0 },
124: { "read", NULL, SSH2_FXP_READ, process_read, 0 },
125: { "write", NULL, SSH2_FXP_WRITE, process_write, 1 },
126: { "lstat", NULL, SSH2_FXP_LSTAT, process_lstat, 0 },
127: { "fstat", NULL, SSH2_FXP_FSTAT, process_fstat, 0 },
128: { "setstat", NULL, SSH2_FXP_SETSTAT, process_setstat, 1 },
129: { "fsetstat", NULL, SSH2_FXP_FSETSTAT, process_fsetstat, 1 },
130: { "opendir", NULL, SSH2_FXP_OPENDIR, process_opendir, 0 },
131: { "readdir", NULL, SSH2_FXP_READDIR, process_readdir, 0 },
132: { "remove", NULL, SSH2_FXP_REMOVE, process_remove, 1 },
133: { "mkdir", NULL, SSH2_FXP_MKDIR, process_mkdir, 1 },
134: { "rmdir", NULL, SSH2_FXP_RMDIR, process_rmdir, 1 },
135: { "realpath", NULL, SSH2_FXP_REALPATH, process_realpath, 0 },
136: { "stat", NULL, SSH2_FXP_STAT, process_stat, 0 },
137: { "rename", NULL, SSH2_FXP_RENAME, process_rename, 1 },
138: { "readlink", NULL, SSH2_FXP_READLINK, process_readlink, 0 },
139: { "symlink", NULL, SSH2_FXP_SYMLINK, process_symlink, 1 },
140: { NULL, NULL, 0, NULL, 0 }
141: };
142:
143: /* SSH2_FXP_EXTENDED submessages */
1.113 djm 144: static const struct sftp_handler extended_handlers[] = {
1.98 djm 145: { "posix-rename", "posix-rename@openssh.com", 0,
146: process_extended_posix_rename, 1 },
147: { "statvfs", "statvfs@openssh.com", 0, process_extended_statvfs, 0 },
148: { "fstatvfs", "fstatvfs@openssh.com", 0, process_extended_fstatvfs, 0 },
149: { "hardlink", "hardlink@openssh.com", 0, process_extended_hardlink, 1 },
1.102 djm 150: { "fsync", "fsync@openssh.com", 0, process_extended_fsync, 1 },
1.114 djm 151: { "lsetstat", "lsetstat@openssh.com", 0, process_extended_lsetstat, 1 },
1.122 ! djm 152: { "limits", "limits@openssh.com", 0, process_extended_limits, 1 },
1.98 djm 153: { NULL, NULL, 0, NULL, 0 }
154: };
155:
156: static int
1.113 djm 157: request_permitted(const struct sftp_handler *h)
1.98 djm 158: {
159: char *result;
160:
161: if (readonly && h->does_write) {
162: verbose("Refusing %s request in read-only mode", h->name);
163: return 0;
164: }
1.118 djm 165: if (request_denylist != NULL &&
166: ((result = match_list(h->name, request_denylist, NULL))) != NULL) {
1.98 djm 167: free(result);
1.118 djm 168: verbose("Refusing denylisted %s request", h->name);
1.98 djm 169: return 0;
170: }
1.118 djm 171: if (request_allowlist != NULL &&
172: ((result = match_list(h->name, request_allowlist, NULL))) != NULL) {
1.98 djm 173: free(result);
1.118 djm 174: debug2("Permitting allowlisted %s request", h->name);
1.98 djm 175: return 1;
176: }
1.118 djm 177: if (request_allowlist != NULL) {
178: verbose("Refusing non-allowlisted %s request", h->name);
1.98 djm 179: return 0;
180: }
181: return 1;
182: }
183:
1.28 itojun 184: static int
1.2 markus 185: errno_to_portable(int unixerrno)
1.1 markus 186: {
187: int ret = 0;
1.22 deraadt 188:
1.2 markus 189: switch (unixerrno) {
1.1 markus 190: case 0:
1.10 markus 191: ret = SSH2_FX_OK;
1.1 markus 192: break;
193: case ENOENT:
194: case ENOTDIR:
195: case EBADF:
196: case ELOOP:
1.10 markus 197: ret = SSH2_FX_NO_SUCH_FILE;
1.1 markus 198: break;
199: case EPERM:
200: case EACCES:
201: case EFAULT:
1.10 markus 202: ret = SSH2_FX_PERMISSION_DENIED;
1.1 markus 203: break;
204: case ENAMETOOLONG:
205: case EINVAL:
1.10 markus 206: ret = SSH2_FX_BAD_MESSAGE;
1.82 dtucker 207: break;
208: case ENOSYS:
209: ret = SSH2_FX_OP_UNSUPPORTED;
1.1 markus 210: break;
211: default:
1.10 markus 212: ret = SSH2_FX_FAILURE;
1.1 markus 213: break;
214: }
215: return ret;
216: }
217:
1.28 itojun 218: static int
1.1 markus 219: flags_from_portable(int pflags)
220: {
221: int flags = 0;
1.22 deraadt 222:
1.20 deraadt 223: if ((pflags & SSH2_FXF_READ) &&
224: (pflags & SSH2_FXF_WRITE)) {
1.1 markus 225: flags = O_RDWR;
1.10 markus 226: } else if (pflags & SSH2_FXF_READ) {
1.1 markus 227: flags = O_RDONLY;
1.10 markus 228: } else if (pflags & SSH2_FXF_WRITE) {
1.1 markus 229: flags = O_WRONLY;
230: }
1.101 djm 231: if (pflags & SSH2_FXF_APPEND)
232: flags |= O_APPEND;
1.10 markus 233: if (pflags & SSH2_FXF_CREAT)
1.1 markus 234: flags |= O_CREAT;
1.10 markus 235: if (pflags & SSH2_FXF_TRUNC)
1.1 markus 236: flags |= O_TRUNC;
1.10 markus 237: if (pflags & SSH2_FXF_EXCL)
1.1 markus 238: flags |= O_EXCL;
239: return flags;
240: }
241:
1.58 djm 242: static const char *
243: string_from_portable(int pflags)
244: {
245: static char ret[128];
246:
247: *ret = '\0';
248:
249: #define PAPPEND(str) { \
250: if (*ret != '\0') \
251: strlcat(ret, ",", sizeof(ret)); \
1.70 deraadt 252: strlcat(ret, str, sizeof(ret)); \
1.58 djm 253: }
254:
255: if (pflags & SSH2_FXF_READ)
256: PAPPEND("READ")
257: if (pflags & SSH2_FXF_WRITE)
258: PAPPEND("WRITE")
1.101 djm 259: if (pflags & SSH2_FXF_APPEND)
260: PAPPEND("APPEND")
1.58 djm 261: if (pflags & SSH2_FXF_CREAT)
262: PAPPEND("CREATE")
263: if (pflags & SSH2_FXF_TRUNC)
264: PAPPEND("TRUNCATE")
265: if (pflags & SSH2_FXF_EXCL)
266: PAPPEND("EXCL")
267:
268: return ret;
269: }
270:
1.1 markus 271: /* handle handles */
272:
273: typedef struct Handle Handle;
274: struct Handle {
275: int use;
276: DIR *dirp;
277: int fd;
1.101 djm 278: int flags;
1.1 markus 279: char *name;
1.58 djm 280: u_int64_t bytes_read, bytes_write;
1.75 djm 281: int next_unused;
1.1 markus 282: };
1.22 deraadt 283:
1.1 markus 284: enum {
285: HANDLE_UNUSED,
286: HANDLE_DIR,
287: HANDLE_FILE
288: };
1.22 deraadt 289:
1.113 djm 290: static Handle *handles = NULL;
291: static u_int num_handles = 0;
292: static int first_unused_handle = -1;
1.75 djm 293:
294: static void handle_unused(int i)
295: {
296: handles[i].use = HANDLE_UNUSED;
297: handles[i].next_unused = first_unused_handle;
298: first_unused_handle = i;
1.1 markus 299: }
300:
1.28 itojun 301: static int
1.101 djm 302: handle_new(int use, const char *name, int fd, int flags, DIR *dirp)
1.1 markus 303: {
1.75 djm 304: int i;
305:
306: if (first_unused_handle == -1) {
307: if (num_handles + 1 <= num_handles)
308: return -1;
309: num_handles++;
1.106 deraadt 310: handles = xreallocarray(handles, num_handles, sizeof(Handle));
1.75 djm 311: handle_unused(num_handles - 1);
312: }
313:
314: i = first_unused_handle;
315: first_unused_handle = handles[i].next_unused;
316:
317: handles[i].use = use;
318: handles[i].dirp = dirp;
319: handles[i].fd = fd;
1.101 djm 320: handles[i].flags = flags;
1.75 djm 321: handles[i].name = xstrdup(name);
322: handles[i].bytes_read = handles[i].bytes_write = 0;
1.22 deraadt 323:
1.75 djm 324: return i;
1.1 markus 325: }
326:
1.28 itojun 327: static int
1.1 markus 328: handle_is_ok(int i, int type)
329: {
1.75 djm 330: return i >= 0 && (u_int)i < num_handles && handles[i].use == type;
1.1 markus 331: }
332:
1.28 itojun 333: static int
1.104 djm 334: handle_to_string(int handle, u_char **stringp, int *hlenp)
1.1 markus 335: {
336: if (stringp == NULL || hlenp == NULL)
337: return -1;
1.13 markus 338: *stringp = xmalloc(sizeof(int32_t));
1.57 djm 339: put_u32(*stringp, handle);
1.13 markus 340: *hlenp = sizeof(int32_t);
1.1 markus 341: return 0;
342: }
343:
1.28 itojun 344: static int
1.104 djm 345: handle_from_string(const u_char *handle, u_int hlen)
1.1 markus 346: {
1.13 markus 347: int val;
1.22 deraadt 348:
1.13 markus 349: if (hlen != sizeof(int32_t))
1.1 markus 350: return -1;
1.57 djm 351: val = get_u32(handle);
1.1 markus 352: if (handle_is_ok(val, HANDLE_FILE) ||
353: handle_is_ok(val, HANDLE_DIR))
354: return val;
355: return -1;
356: }
357:
1.28 itojun 358: static char *
1.1 markus 359: handle_to_name(int handle)
360: {
361: if (handle_is_ok(handle, HANDLE_DIR)||
362: handle_is_ok(handle, HANDLE_FILE))
363: return handles[handle].name;
364: return NULL;
365: }
366:
1.28 itojun 367: static DIR *
1.1 markus 368: handle_to_dir(int handle)
369: {
370: if (handle_is_ok(handle, HANDLE_DIR))
371: return handles[handle].dirp;
372: return NULL;
373: }
374:
1.28 itojun 375: static int
1.1 markus 376: handle_to_fd(int handle)
377: {
1.17 stevesk 378: if (handle_is_ok(handle, HANDLE_FILE))
1.1 markus 379: return handles[handle].fd;
380: return -1;
381: }
382:
1.101 djm 383: static int
384: handle_to_flags(int handle)
385: {
386: if (handle_is_ok(handle, HANDLE_FILE))
387: return handles[handle].flags;
388: return 0;
389: }
390:
1.58 djm 391: static void
392: handle_update_read(int handle, ssize_t bytes)
393: {
394: if (handle_is_ok(handle, HANDLE_FILE) && bytes > 0)
395: handles[handle].bytes_read += bytes;
396: }
397:
398: static void
399: handle_update_write(int handle, ssize_t bytes)
400: {
401: if (handle_is_ok(handle, HANDLE_FILE) && bytes > 0)
402: handles[handle].bytes_write += bytes;
403: }
404:
405: static u_int64_t
406: handle_bytes_read(int handle)
407: {
408: if (handle_is_ok(handle, HANDLE_FILE))
409: return (handles[handle].bytes_read);
410: return 0;
411: }
412:
413: static u_int64_t
414: handle_bytes_write(int handle)
415: {
416: if (handle_is_ok(handle, HANDLE_FILE))
417: return (handles[handle].bytes_write);
418: return 0;
419: }
420:
1.28 itojun 421: static int
1.1 markus 422: handle_close(int handle)
423: {
424: int ret = -1;
1.22 deraadt 425:
1.1 markus 426: if (handle_is_ok(handle, HANDLE_FILE)) {
427: ret = close(handles[handle].fd);
1.97 djm 428: free(handles[handle].name);
1.75 djm 429: handle_unused(handle);
1.1 markus 430: } else if (handle_is_ok(handle, HANDLE_DIR)) {
431: ret = closedir(handles[handle].dirp);
1.97 djm 432: free(handles[handle].name);
1.75 djm 433: handle_unused(handle);
1.1 markus 434: } else {
435: errno = ENOENT;
436: }
437: return ret;
438: }
439:
1.58 djm 440: static void
441: handle_log_close(int handle, char *emsg)
442: {
443: if (handle_is_ok(handle, HANDLE_FILE)) {
444: logit("%s%sclose \"%s\" bytes read %llu written %llu",
445: emsg == NULL ? "" : emsg, emsg == NULL ? "" : " ",
446: handle_to_name(handle),
1.72 stevesk 447: (unsigned long long)handle_bytes_read(handle),
448: (unsigned long long)handle_bytes_write(handle));
1.58 djm 449: } else {
450: logit("%s%sclosedir \"%s\"",
451: emsg == NULL ? "" : emsg, emsg == NULL ? "" : " ",
452: handle_to_name(handle));
453: }
454: }
455:
456: static void
457: handle_log_exit(void)
458: {
459: u_int i;
460:
1.75 djm 461: for (i = 0; i < num_handles; i++)
1.58 djm 462: if (handles[i].use != HANDLE_UNUSED)
463: handle_log_close(i, "forced");
464: }
465:
1.28 itojun 466: static int
1.104 djm 467: get_handle(struct sshbuf *queue, int *hp)
1.1 markus 468: {
1.104 djm 469: u_char *handle;
470: int r;
471: size_t hlen;
472:
473: *hp = -1;
474: if ((r = sshbuf_get_string(queue, &handle, &hlen)) != 0)
475: return r;
1.10 markus 476: if (hlen < 256)
1.104 djm 477: *hp = handle_from_string(handle, hlen);
1.97 djm 478: free(handle);
1.104 djm 479: return 0;
1.1 markus 480: }
481:
482: /* send replies */
483:
1.28 itojun 484: static void
1.104 djm 485: send_msg(struct sshbuf *m)
1.1 markus 486: {
1.104 djm 487: int r;
1.22 deraadt 488:
1.104 djm 489: if ((r = sshbuf_put_stringb(oqueue, m)) != 0)
1.120 djm 490: fatal_fr(r, "enqueue");
1.104 djm 491: sshbuf_reset(m);
1.1 markus 492: }
493:
1.58 djm 494: static const char *
495: status_to_message(u_int32_t status)
1.1 markus 496: {
1.23 djm 497: const char *status_messages[] = {
498: "Success", /* SSH_FX_OK */
499: "End of file", /* SSH_FX_EOF */
500: "No such file", /* SSH_FX_NO_SUCH_FILE */
501: "Permission denied", /* SSH_FX_PERMISSION_DENIED */
502: "Failure", /* SSH_FX_FAILURE */
503: "Bad message", /* SSH_FX_BAD_MESSAGE */
504: "No connection", /* SSH_FX_NO_CONNECTION */
505: "Connection lost", /* SSH_FX_CONNECTION_LOST */
506: "Operation unsupported", /* SSH_FX_OP_UNSUPPORTED */
507: "Unknown error" /* Others */
508: };
1.110 deraadt 509: return (status_messages[MINIMUM(status,SSH2_FX_MAX)]);
1.58 djm 510: }
1.22 deraadt 511:
1.58 djm 512: static void
513: send_status(u_int32_t id, u_int32_t status)
514: {
1.104 djm 515: struct sshbuf *msg;
516: int r;
1.58 djm 517:
518: debug3("request %u: sent status %u", id, status);
519: if (log_level > SYSLOG_LEVEL_VERBOSE ||
520: (status != SSH2_FX_OK && status != SSH2_FX_EOF))
521: logit("sent status %s", status_to_message(status));
1.104 djm 522: if ((msg = sshbuf_new()) == NULL)
1.120 djm 523: fatal_f("sshbuf_new failed");
1.104 djm 524: if ((r = sshbuf_put_u8(msg, SSH2_FXP_STATUS)) != 0 ||
525: (r = sshbuf_put_u32(msg, id)) != 0 ||
526: (r = sshbuf_put_u32(msg, status)) != 0)
1.120 djm 527: fatal_fr(r, "compose");
1.23 djm 528: if (version >= 3) {
1.104 djm 529: if ((r = sshbuf_put_cstring(msg,
530: status_to_message(status))) != 0 ||
531: (r = sshbuf_put_cstring(msg, "")) != 0)
1.120 djm 532: fatal_fr(r, "compose message");
1.23 djm 533: }
1.104 djm 534: send_msg(msg);
535: sshbuf_free(msg);
1.1 markus 536: }
1.28 itojun 537: static void
1.104 djm 538: send_data_or_handle(char type, u_int32_t id, const u_char *data, int dlen)
1.1 markus 539: {
1.104 djm 540: struct sshbuf *msg;
541: int r;
1.22 deraadt 542:
1.104 djm 543: if ((msg = sshbuf_new()) == NULL)
1.120 djm 544: fatal_f("sshbuf_new failed");
1.104 djm 545: if ((r = sshbuf_put_u8(msg, type)) != 0 ||
546: (r = sshbuf_put_u32(msg, id)) != 0 ||
547: (r = sshbuf_put_string(msg, data, dlen)) != 0)
1.120 djm 548: fatal_fr(r, "compose");
1.104 djm 549: send_msg(msg);
550: sshbuf_free(msg);
1.1 markus 551: }
552:
1.28 itojun 553: static void
1.104 djm 554: send_data(u_int32_t id, const u_char *data, int dlen)
1.1 markus 555: {
1.58 djm 556: debug("request %u: sent data len %d", id, dlen);
1.10 markus 557: send_data_or_handle(SSH2_FXP_DATA, id, data, dlen);
1.1 markus 558: }
559:
1.28 itojun 560: static void
1.1 markus 561: send_handle(u_int32_t id, int handle)
562: {
1.104 djm 563: u_char *string;
1.1 markus 564: int hlen;
1.22 deraadt 565:
1.1 markus 566: handle_to_string(handle, &string, &hlen);
1.58 djm 567: debug("request %u: sent handle handle %d", id, handle);
1.10 markus 568: send_data_or_handle(SSH2_FXP_HANDLE, id, string, hlen);
1.97 djm 569: free(string);
1.1 markus 570: }
571:
1.28 itojun 572: static void
1.44 jakob 573: send_names(u_int32_t id, int count, const Stat *stats)
1.1 markus 574: {
1.104 djm 575: struct sshbuf *msg;
576: int i, r;
1.22 deraadt 577:
1.104 djm 578: if ((msg = sshbuf_new()) == NULL)
1.120 djm 579: fatal_f("sshbuf_new failed");
1.104 djm 580: if ((r = sshbuf_put_u8(msg, SSH2_FXP_NAME)) != 0 ||
581: (r = sshbuf_put_u32(msg, id)) != 0 ||
582: (r = sshbuf_put_u32(msg, count)) != 0)
1.120 djm 583: fatal_fr(r, "compose");
1.58 djm 584: debug("request %u: sent names count %d", id, count);
1.1 markus 585: for (i = 0; i < count; i++) {
1.104 djm 586: if ((r = sshbuf_put_cstring(msg, stats[i].name)) != 0 ||
587: (r = sshbuf_put_cstring(msg, stats[i].long_name)) != 0 ||
588: (r = encode_attrib(msg, &stats[i].attrib)) != 0)
1.120 djm 589: fatal_fr(r, "compose filenames/attrib");
1.1 markus 590: }
1.104 djm 591: send_msg(msg);
592: sshbuf_free(msg);
1.1 markus 593: }
594:
1.28 itojun 595: static void
1.44 jakob 596: send_attrib(u_int32_t id, const Attrib *a)
1.1 markus 597: {
1.104 djm 598: struct sshbuf *msg;
599: int r;
1.22 deraadt 600:
1.58 djm 601: debug("request %u: sent attrib have 0x%x", id, a->flags);
1.104 djm 602: if ((msg = sshbuf_new()) == NULL)
1.120 djm 603: fatal_f("sshbuf_new failed");
1.104 djm 604: if ((r = sshbuf_put_u8(msg, SSH2_FXP_ATTRS)) != 0 ||
605: (r = sshbuf_put_u32(msg, id)) != 0 ||
606: (r = encode_attrib(msg, a)) != 0)
1.120 djm 607: fatal_fr(r, "compose");
1.104 djm 608: send_msg(msg);
609: sshbuf_free(msg);
1.1 markus 610: }
611:
1.79 djm 612: static void
613: send_statvfs(u_int32_t id, struct statvfs *st)
614: {
1.104 djm 615: struct sshbuf *msg;
1.79 djm 616: u_int64_t flag;
1.104 djm 617: int r;
1.79 djm 618:
619: flag = (st->f_flag & ST_RDONLY) ? SSH2_FXE_STATVFS_ST_RDONLY : 0;
620: flag |= (st->f_flag & ST_NOSUID) ? SSH2_FXE_STATVFS_ST_NOSUID : 0;
621:
1.104 djm 622: if ((msg = sshbuf_new()) == NULL)
1.120 djm 623: fatal_f("sshbuf_new failed");
1.104 djm 624: if ((r = sshbuf_put_u8(msg, SSH2_FXP_EXTENDED_REPLY)) != 0 ||
625: (r = sshbuf_put_u32(msg, id)) != 0 ||
626: (r = sshbuf_put_u64(msg, st->f_bsize)) != 0 ||
627: (r = sshbuf_put_u64(msg, st->f_frsize)) != 0 ||
628: (r = sshbuf_put_u64(msg, st->f_blocks)) != 0 ||
629: (r = sshbuf_put_u64(msg, st->f_bfree)) != 0 ||
630: (r = sshbuf_put_u64(msg, st->f_bavail)) != 0 ||
631: (r = sshbuf_put_u64(msg, st->f_files)) != 0 ||
632: (r = sshbuf_put_u64(msg, st->f_ffree)) != 0 ||
633: (r = sshbuf_put_u64(msg, st->f_favail)) != 0 ||
634: (r = sshbuf_put_u64(msg, st->f_fsid)) != 0 ||
635: (r = sshbuf_put_u64(msg, flag)) != 0 ||
636: (r = sshbuf_put_u64(msg, st->f_namemax)) != 0)
1.120 djm 637: fatal_fr(r, "compose");
1.104 djm 638: send_msg(msg);
639: sshbuf_free(msg);
1.79 djm 640: }
641:
1.1 markus 642: /* parse incoming */
643:
1.28 itojun 644: static void
1.1 markus 645: process_init(void)
646: {
1.104 djm 647: struct sshbuf *msg;
648: int r;
1.1 markus 649:
1.104 djm 650: if ((r = sshbuf_get_u32(iqueue, &version)) != 0)
1.120 djm 651: fatal_fr(r, "parse");
1.94 djm 652: verbose("received client version %u", version);
1.104 djm 653: if ((msg = sshbuf_new()) == NULL)
1.120 djm 654: fatal_f("sshbuf_new failed");
1.104 djm 655: if ((r = sshbuf_put_u8(msg, SSH2_FXP_VERSION)) != 0 ||
656: (r = sshbuf_put_u32(msg, SSH2_FILEXFER_VERSION)) != 0 ||
657: /* POSIX rename extension */
658: (r = sshbuf_put_cstring(msg, "posix-rename@openssh.com")) != 0 ||
659: (r = sshbuf_put_cstring(msg, "1")) != 0 || /* version */
660: /* statvfs extension */
661: (r = sshbuf_put_cstring(msg, "statvfs@openssh.com")) != 0 ||
662: (r = sshbuf_put_cstring(msg, "2")) != 0 || /* version */
663: /* fstatvfs extension */
664: (r = sshbuf_put_cstring(msg, "fstatvfs@openssh.com")) != 0 ||
665: (r = sshbuf_put_cstring(msg, "2")) != 0 || /* version */
666: /* hardlink extension */
667: (r = sshbuf_put_cstring(msg, "hardlink@openssh.com")) != 0 ||
668: (r = sshbuf_put_cstring(msg, "1")) != 0 || /* version */
669: /* fsync extension */
670: (r = sshbuf_put_cstring(msg, "fsync@openssh.com")) != 0 ||
1.114 djm 671: (r = sshbuf_put_cstring(msg, "1")) != 0 || /* version */
1.121 djm 672: /* lsetstat extension */
1.114 djm 673: (r = sshbuf_put_cstring(msg, "lsetstat@openssh.com")) != 0 ||
1.122 ! djm 674: (r = sshbuf_put_cstring(msg, "1")) != 0 || /* version */
! 675: /* limits extension */
! 676: (r = sshbuf_put_cstring(msg, "limits@openssh.com")) != 0 ||
1.104 djm 677: (r = sshbuf_put_cstring(msg, "1")) != 0) /* version */
1.120 djm 678: fatal_fr(r, "compose");
1.104 djm 679: send_msg(msg);
680: sshbuf_free(msg);
1.1 markus 681: }
682:
1.28 itojun 683: static void
1.98 djm 684: process_open(u_int32_t id)
1.1 markus 685: {
1.98 djm 686: u_int32_t pflags;
1.104 djm 687: Attrib a;
1.1 markus 688: char *name;
1.104 djm 689: int r, handle, fd, flags, mode, status = SSH2_FX_FAILURE;
690:
691: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0 ||
692: (r = sshbuf_get_u32(iqueue, &pflags)) != 0 || /* portable flags */
693: (r = decode_attrib(iqueue, &a)) != 0)
1.120 djm 694: fatal_fr(r, "parse");
1.1 markus 695:
1.61 djm 696: debug3("request %u: open flags %d", id, pflags);
1.1 markus 697: flags = flags_from_portable(pflags);
1.104 djm 698: mode = (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ? a.perm : 0666;
1.58 djm 699: logit("open \"%s\" flags %s mode 0%o",
700: name, string_from_portable(pflags), mode);
1.90 djm 701: if (readonly &&
1.111 djm 702: ((flags & O_ACCMODE) != O_RDONLY ||
703: (flags & (O_CREAT|O_TRUNC)) != 0)) {
1.98 djm 704: verbose("Refusing open request in read-only mode");
1.104 djm 705: status = SSH2_FX_PERMISSION_DENIED;
1.98 djm 706: } else {
1.90 djm 707: fd = open(name, flags, mode);
1.116 deraadt 708: if (fd == -1) {
1.90 djm 709: status = errno_to_portable(errno);
1.1 markus 710: } else {
1.101 djm 711: handle = handle_new(HANDLE_FILE, name, fd, flags, NULL);
1.90 djm 712: if (handle < 0) {
713: close(fd);
714: } else {
715: send_handle(id, handle);
716: status = SSH2_FX_OK;
717: }
1.1 markus 718: }
719: }
1.10 markus 720: if (status != SSH2_FX_OK)
1.1 markus 721: send_status(id, status);
1.97 djm 722: free(name);
1.1 markus 723: }
724:
1.28 itojun 725: static void
1.98 djm 726: process_close(u_int32_t id)
1.1 markus 727: {
1.104 djm 728: int r, handle, ret, status = SSH2_FX_FAILURE;
729:
730: if ((r = get_handle(iqueue, &handle)) != 0)
1.120 djm 731: fatal_fr(r, "parse");
1.1 markus 732:
1.58 djm 733: debug3("request %u: close handle %u", id, handle);
734: handle_log_close(handle, NULL);
1.1 markus 735: ret = handle_close(handle);
1.10 markus 736: status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.1 markus 737: send_status(id, status);
738: }
739:
1.28 itojun 740: static void
1.98 djm 741: process_read(u_int32_t id)
1.1 markus 742: {
1.122 ! djm 743: u_char buf[SFTP_MAX_READ_LENGTH];
1.98 djm 744: u_int32_t len;
1.104 djm 745: int r, handle, fd, ret, status = SSH2_FX_FAILURE;
1.1 markus 746: u_int64_t off;
747:
1.104 djm 748: if ((r = get_handle(iqueue, &handle)) != 0 ||
749: (r = sshbuf_get_u64(iqueue, &off)) != 0 ||
750: (r = sshbuf_get_u32(iqueue, &len)) != 0)
1.120 djm 751: fatal_fr(r, "parse");
1.1 markus 752:
1.58 djm 753: debug("request %u: read \"%s\" (handle %d) off %llu len %d",
754: id, handle_to_name(handle), handle, (unsigned long long)off, len);
1.1 markus 755: if (len > sizeof buf) {
756: len = sizeof buf;
1.58 djm 757: debug2("read change len %d", len);
1.1 markus 758: }
759: fd = handle_to_fd(handle);
760: if (fd >= 0) {
1.116 deraadt 761: if (lseek(fd, off, SEEK_SET) == -1) {
1.1 markus 762: error("process_read: seek failed");
763: status = errno_to_portable(errno);
764: } else {
765: ret = read(fd, buf, len);
1.116 deraadt 766: if (ret == -1) {
1.1 markus 767: status = errno_to_portable(errno);
768: } else if (ret == 0) {
1.10 markus 769: status = SSH2_FX_EOF;
1.1 markus 770: } else {
771: send_data(id, buf, ret);
1.10 markus 772: status = SSH2_FX_OK;
1.58 djm 773: handle_update_read(handle, ret);
1.1 markus 774: }
775: }
776: }
1.10 markus 777: if (status != SSH2_FX_OK)
1.1 markus 778: send_status(id, status);
779: }
780:
1.28 itojun 781: static void
1.98 djm 782: process_write(u_int32_t id)
1.1 markus 783: {
784: u_int64_t off;
1.104 djm 785: size_t len;
786: int r, handle, fd, ret, status;
787: u_char *data;
788:
789: if ((r = get_handle(iqueue, &handle)) != 0 ||
790: (r = sshbuf_get_u64(iqueue, &off)) != 0 ||
791: (r = sshbuf_get_string(iqueue, &data, &len)) != 0)
1.120 djm 792: fatal_fr(r, "parse");
1.1 markus 793:
1.104 djm 794: debug("request %u: write \"%s\" (handle %d) off %llu len %zu",
1.58 djm 795: id, handle_to_name(handle), handle, (unsigned long long)off, len);
1.1 markus 796: fd = handle_to_fd(handle);
1.104 djm 797:
1.90 djm 798: if (fd < 0)
799: status = SSH2_FX_FAILURE;
800: else {
1.101 djm 801: if (!(handle_to_flags(handle) & O_APPEND) &&
1.116 deraadt 802: lseek(fd, off, SEEK_SET) == -1) {
1.1 markus 803: status = errno_to_portable(errno);
1.120 djm 804: error_f("seek failed");
1.1 markus 805: } else {
806: /* XXX ATOMICIO ? */
807: ret = write(fd, data, len);
1.116 deraadt 808: if (ret == -1) {
1.120 djm 809: error_f("write: %s", strerror(errno));
1.1 markus 810: status = errno_to_portable(errno);
1.48 djm 811: } else if ((size_t)ret == len) {
1.10 markus 812: status = SSH2_FX_OK;
1.58 djm 813: handle_update_write(handle, ret);
1.1 markus 814: } else {
1.120 djm 815: debug2_f("nothing at all written");
1.90 djm 816: status = SSH2_FX_FAILURE;
1.1 markus 817: }
818: }
819: }
820: send_status(id, status);
1.97 djm 821: free(data);
1.1 markus 822: }
823:
1.28 itojun 824: static void
1.98 djm 825: process_do_stat(u_int32_t id, int do_lstat)
1.1 markus 826: {
1.13 markus 827: Attrib a;
1.1 markus 828: struct stat st;
829: char *name;
1.104 djm 830: int r, status = SSH2_FX_FAILURE;
831:
832: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0)
1.120 djm 833: fatal_fr(r, "parse");
1.1 markus 834:
1.58 djm 835: debug3("request %u: %sstat", id, do_lstat ? "l" : "");
836: verbose("%sstat name \"%s\"", do_lstat ? "l" : "", name);
1.104 djm 837: r = do_lstat ? lstat(name, &st) : stat(name, &st);
1.116 deraadt 838: if (r == -1) {
1.1 markus 839: status = errno_to_portable(errno);
840: } else {
1.13 markus 841: stat_to_attrib(&st, &a);
842: send_attrib(id, &a);
1.10 markus 843: status = SSH2_FX_OK;
1.1 markus 844: }
1.10 markus 845: if (status != SSH2_FX_OK)
1.1 markus 846: send_status(id, status);
1.97 djm 847: free(name);
1.1 markus 848: }
849:
1.28 itojun 850: static void
1.98 djm 851: process_stat(u_int32_t id)
1.1 markus 852: {
1.98 djm 853: process_do_stat(id, 0);
1.1 markus 854: }
855:
1.28 itojun 856: static void
1.98 djm 857: process_lstat(u_int32_t id)
1.1 markus 858: {
1.98 djm 859: process_do_stat(id, 1);
1.1 markus 860: }
861:
1.28 itojun 862: static void
1.98 djm 863: process_fstat(u_int32_t id)
1.1 markus 864: {
1.13 markus 865: Attrib a;
1.1 markus 866: struct stat st;
1.104 djm 867: int fd, r, handle, status = SSH2_FX_FAILURE;
1.1 markus 868:
1.104 djm 869: if ((r = get_handle(iqueue, &handle)) != 0)
1.120 djm 870: fatal_fr(r, "parse");
1.58 djm 871: debug("request %u: fstat \"%s\" (handle %u)",
872: id, handle_to_name(handle), handle);
1.1 markus 873: fd = handle_to_fd(handle);
1.71 stevesk 874: if (fd >= 0) {
1.104 djm 875: r = fstat(fd, &st);
1.116 deraadt 876: if (r == -1) {
1.1 markus 877: status = errno_to_portable(errno);
878: } else {
1.13 markus 879: stat_to_attrib(&st, &a);
880: send_attrib(id, &a);
1.10 markus 881: status = SSH2_FX_OK;
1.1 markus 882: }
883: }
1.10 markus 884: if (status != SSH2_FX_OK)
1.1 markus 885: send_status(id, status);
886: }
887:
1.28 itojun 888: static struct timeval *
1.44 jakob 889: attrib_to_tv(const Attrib *a)
1.1 markus 890: {
891: static struct timeval tv[2];
1.22 deraadt 892:
1.1 markus 893: tv[0].tv_sec = a->atime;
894: tv[0].tv_usec = 0;
895: tv[1].tv_sec = a->mtime;
896: tv[1].tv_usec = 0;
897: return tv;
898: }
899:
1.114 djm 900: static struct timespec *
901: attrib_to_ts(const Attrib *a)
902: {
903: static struct timespec ts[2];
904:
905: ts[0].tv_sec = a->atime;
906: ts[0].tv_nsec = 0;
907: ts[1].tv_sec = a->mtime;
908: ts[1].tv_nsec = 0;
909: return ts;
910: }
911:
1.28 itojun 912: static void
1.98 djm 913: process_setstat(u_int32_t id)
1.1 markus 914: {
1.104 djm 915: Attrib a;
1.1 markus 916: char *name;
1.104 djm 917: int r, status = SSH2_FX_OK;
918:
919: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0 ||
920: (r = decode_attrib(iqueue, &a)) != 0)
1.120 djm 921: fatal_fr(r, "parse");
1.1 markus 922:
1.58 djm 923: debug("request %u: setstat name \"%s\"", id, name);
1.104 djm 924: if (a.flags & SSH2_FILEXFER_ATTR_SIZE) {
1.72 stevesk 925: logit("set \"%s\" size %llu",
1.104 djm 926: name, (unsigned long long)a.size);
927: r = truncate(name, a.size);
928: if (r == -1)
1.33 markus 929: status = errno_to_portable(errno);
930: }
1.104 djm 931: if (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
932: logit("set \"%s\" mode %04o", name, a.perm);
933: r = chmod(name, a.perm & 07777);
934: if (r == -1)
1.1 markus 935: status = errno_to_portable(errno);
936: }
1.104 djm 937: if (a.flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
1.58 djm 938: char buf[64];
1.104 djm 939: time_t t = a.mtime;
1.58 djm 940:
941: strftime(buf, sizeof(buf), "%Y%m%d-%H:%M:%S",
942: localtime(&t));
943: logit("set \"%s\" modtime %s", name, buf);
1.104 djm 944: r = utimes(name, attrib_to_tv(&a));
945: if (r == -1)
1.1 markus 946: status = errno_to_portable(errno);
947: }
1.104 djm 948: if (a.flags & SSH2_FILEXFER_ATTR_UIDGID) {
1.58 djm 949: logit("set \"%s\" owner %lu group %lu", name,
1.104 djm 950: (u_long)a.uid, (u_long)a.gid);
951: r = chown(name, a.uid, a.gid);
952: if (r == -1)
1.18 stevesk 953: status = errno_to_portable(errno);
954: }
1.1 markus 955: send_status(id, status);
1.97 djm 956: free(name);
1.1 markus 957: }
958:
1.28 itojun 959: static void
1.98 djm 960: process_fsetstat(u_int32_t id)
1.1 markus 961: {
1.104 djm 962: Attrib a;
963: int handle, fd, r;
1.10 markus 964: int status = SSH2_FX_OK;
1.1 markus 965:
1.104 djm 966: if ((r = get_handle(iqueue, &handle)) != 0 ||
967: (r = decode_attrib(iqueue, &a)) != 0)
1.120 djm 968: fatal_fr(r, "parse");
1.104 djm 969:
1.58 djm 970: debug("request %u: fsetstat handle %d", id, handle);
1.1 markus 971: fd = handle_to_fd(handle);
1.90 djm 972: if (fd < 0)
1.10 markus 973: status = SSH2_FX_FAILURE;
1.90 djm 974: else {
1.58 djm 975: char *name = handle_to_name(handle);
976:
1.104 djm 977: if (a.flags & SSH2_FILEXFER_ATTR_SIZE) {
1.72 stevesk 978: logit("set \"%s\" size %llu",
1.104 djm 979: name, (unsigned long long)a.size);
980: r = ftruncate(fd, a.size);
981: if (r == -1)
1.33 markus 982: status = errno_to_portable(errno);
983: }
1.104 djm 984: if (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
985: logit("set \"%s\" mode %04o", name, a.perm);
986: r = fchmod(fd, a.perm & 07777);
987: if (r == -1)
1.1 markus 988: status = errno_to_portable(errno);
989: }
1.104 djm 990: if (a.flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
1.58 djm 991: char buf[64];
1.104 djm 992: time_t t = a.mtime;
1.58 djm 993:
994: strftime(buf, sizeof(buf), "%Y%m%d-%H:%M:%S",
995: localtime(&t));
996: logit("set \"%s\" modtime %s", name, buf);
1.104 djm 997: r = futimes(fd, attrib_to_tv(&a));
998: if (r == -1)
1.18 stevesk 999: status = errno_to_portable(errno);
1000: }
1.104 djm 1001: if (a.flags & SSH2_FILEXFER_ATTR_UIDGID) {
1.58 djm 1002: logit("set \"%s\" owner %lu group %lu", name,
1.104 djm 1003: (u_long)a.uid, (u_long)a.gid);
1004: r = fchown(fd, a.uid, a.gid);
1005: if (r == -1)
1.1 markus 1006: status = errno_to_portable(errno);
1007: }
1008: }
1009: send_status(id, status);
1010: }
1011:
1.28 itojun 1012: static void
1.98 djm 1013: process_opendir(u_int32_t id)
1.1 markus 1014: {
1015: DIR *dirp = NULL;
1016: char *path;
1.104 djm 1017: int r, handle, status = SSH2_FX_FAILURE;
1018:
1019: if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
1.120 djm 1020: fatal_fr(r, "parse");
1.1 markus 1021:
1.58 djm 1022: debug3("request %u: opendir", id);
1023: logit("opendir \"%s\"", path);
1.17 stevesk 1024: dirp = opendir(path);
1.1 markus 1025: if (dirp == NULL) {
1026: status = errno_to_portable(errno);
1027: } else {
1.101 djm 1028: handle = handle_new(HANDLE_DIR, path, 0, 0, dirp);
1.1 markus 1029: if (handle < 0) {
1030: closedir(dirp);
1031: } else {
1032: send_handle(id, handle);
1.10 markus 1033: status = SSH2_FX_OK;
1.1 markus 1034: }
1.17 stevesk 1035:
1.1 markus 1036: }
1.10 markus 1037: if (status != SSH2_FX_OK)
1.1 markus 1038: send_status(id, status);
1.97 djm 1039: free(path);
1.1 markus 1040: }
1041:
1.28 itojun 1042: static void
1.98 djm 1043: process_readdir(u_int32_t id)
1.1 markus 1044: {
1045: DIR *dirp;
1046: struct dirent *dp;
1047: char *path;
1.104 djm 1048: int r, handle;
1049:
1050: if ((r = get_handle(iqueue, &handle)) != 0)
1.120 djm 1051: fatal_fr(r, "parse");
1.1 markus 1052:
1.58 djm 1053: debug("request %u: readdir \"%s\" (handle %d)", id,
1054: handle_to_name(handle), handle);
1.1 markus 1055: dirp = handle_to_dir(handle);
1056: path = handle_to_name(handle);
1057: if (dirp == NULL || path == NULL) {
1.10 markus 1058: send_status(id, SSH2_FX_FAILURE);
1.1 markus 1059: } else {
1060: struct stat st;
1.105 deraadt 1061: char pathname[PATH_MAX];
1.1 markus 1062: Stat *stats;
1063: int nstats = 10, count = 0, i;
1.36 deraadt 1064:
1.54 djm 1065: stats = xcalloc(nstats, sizeof(Stat));
1.1 markus 1066: while ((dp = readdir(dirp)) != NULL) {
1067: if (count >= nstats) {
1068: nstats *= 2;
1.106 deraadt 1069: stats = xreallocarray(stats, nstats, sizeof(Stat));
1.1 markus 1070: }
1071: /* XXX OVERFLOW ? */
1.30 jakob 1072: snprintf(pathname, sizeof pathname, "%s%s%s", path,
1073: strcmp(path, "/") ? "/" : "", dp->d_name);
1.116 deraadt 1074: if (lstat(pathname, &st) == -1)
1.1 markus 1075: continue;
1.13 markus 1076: stat_to_attrib(&st, &(stats[count].attrib));
1.1 markus 1077: stats[count].name = xstrdup(dp->d_name);
1.91 djm 1078: stats[count].long_name = ls_file(dp->d_name, &st, 0, 0);
1.1 markus 1079: count++;
1080: /* send up to 100 entries in one message */
1.11 markus 1081: /* XXX check packet size instead */
1.1 markus 1082: if (count == 100)
1083: break;
1084: }
1.10 markus 1085: if (count > 0) {
1086: send_names(id, count, stats);
1.31 deraadt 1087: for (i = 0; i < count; i++) {
1.97 djm 1088: free(stats[i].name);
1089: free(stats[i].long_name);
1.10 markus 1090: }
1091: } else {
1092: send_status(id, SSH2_FX_EOF);
1.1 markus 1093: }
1.97 djm 1094: free(stats);
1.1 markus 1095: }
1096: }
1097:
1.28 itojun 1098: static void
1.98 djm 1099: process_remove(u_int32_t id)
1.1 markus 1100: {
1101: char *name;
1.104 djm 1102: int r, status = SSH2_FX_FAILURE;
1103:
1104: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0)
1.120 djm 1105: fatal_fr(r, "parse");
1.1 markus 1106:
1.58 djm 1107: debug3("request %u: remove", id);
1108: logit("remove name \"%s\"", name);
1.104 djm 1109: r = unlink(name);
1110: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.1 markus 1111: send_status(id, status);
1.97 djm 1112: free(name);
1.1 markus 1113: }
1114:
1.28 itojun 1115: static void
1.98 djm 1116: process_mkdir(u_int32_t id)
1.1 markus 1117: {
1.104 djm 1118: Attrib a;
1.1 markus 1119: char *name;
1.104 djm 1120: int r, mode, status = SSH2_FX_FAILURE;
1121:
1122: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0 ||
1123: (r = decode_attrib(iqueue, &a)) != 0)
1.120 djm 1124: fatal_fr(r, "parse");
1.1 markus 1125:
1.104 djm 1126: mode = (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ?
1127: a.perm & 07777 : 0777;
1.58 djm 1128: debug3("request %u: mkdir", id);
1129: logit("mkdir name \"%s\" mode 0%o", name, mode);
1.104 djm 1130: r = mkdir(name, mode);
1131: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.1 markus 1132: send_status(id, status);
1.97 djm 1133: free(name);
1.1 markus 1134: }
1135:
1.28 itojun 1136: static void
1.98 djm 1137: process_rmdir(u_int32_t id)
1.1 markus 1138: {
1139: char *name;
1.104 djm 1140: int r, status;
1141:
1142: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0)
1.120 djm 1143: fatal_fr(r, "parse");
1.1 markus 1144:
1.58 djm 1145: debug3("request %u: rmdir", id);
1146: logit("rmdir name \"%s\"", name);
1.104 djm 1147: r = rmdir(name);
1148: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.1 markus 1149: send_status(id, status);
1.97 djm 1150: free(name);
1.1 markus 1151: }
1152:
1.28 itojun 1153: static void
1.98 djm 1154: process_realpath(u_int32_t id)
1.1 markus 1155: {
1.105 deraadt 1156: char resolvedname[PATH_MAX];
1.1 markus 1157: char *path;
1.104 djm 1158: int r;
1159:
1160: if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
1.120 djm 1161: fatal_fr(r, "parse");
1.1 markus 1162:
1.7 markus 1163: if (path[0] == '\0') {
1.97 djm 1164: free(path);
1.7 markus 1165: path = xstrdup(".");
1166: }
1.58 djm 1167: debug3("request %u: realpath", id);
1168: verbose("realpath \"%s\"", path);
1.117 djm 1169: if (sftp_realpath(path, resolvedname) == NULL) {
1.1 markus 1170: send_status(id, errno_to_portable(errno));
1171: } else {
1172: Stat s;
1173: attrib_clear(&s.attrib);
1174: s.name = s.long_name = resolvedname;
1175: send_names(id, 1, &s);
1176: }
1.97 djm 1177: free(path);
1.1 markus 1178: }
1179:
1.28 itojun 1180: static void
1.98 djm 1181: process_rename(u_int32_t id)
1.1 markus 1182: {
1183: char *oldpath, *newpath;
1.104 djm 1184: int r, status;
1.41 deraadt 1185: struct stat sb;
1.1 markus 1186:
1.104 djm 1187: if ((r = sshbuf_get_cstring(iqueue, &oldpath, NULL)) != 0 ||
1188: (r = sshbuf_get_cstring(iqueue, &newpath, NULL)) != 0)
1.120 djm 1189: fatal_fr(r, "parse");
1.104 djm 1190:
1.58 djm 1191: debug3("request %u: rename", id);
1192: logit("rename old \"%s\" new \"%s\"", oldpath, newpath);
1.41 deraadt 1193: status = SSH2_FX_FAILURE;
1.98 djm 1194: if (lstat(oldpath, &sb) == -1)
1.39 markus 1195: status = errno_to_portable(errno);
1.41 deraadt 1196: else if (S_ISREG(sb.st_mode)) {
1197: /* Race-free rename of regular files */
1.47 dtucker 1198: if (link(oldpath, newpath) == -1) {
1199: if (errno == EOPNOTSUPP) {
1200: struct stat st;
1201:
1202: /*
1203: * fs doesn't support links, so fall back to
1204: * stat+rename. This is racy.
1205: */
1206: if (stat(newpath, &st) == -1) {
1207: if (rename(oldpath, newpath) == -1)
1208: status =
1209: errno_to_portable(errno);
1210: else
1211: status = SSH2_FX_OK;
1212: }
1213: } else {
1214: status = errno_to_portable(errno);
1215: }
1216: } else if (unlink(oldpath) == -1) {
1.41 deraadt 1217: status = errno_to_portable(errno);
1218: /* clean spare link */
1219: unlink(newpath);
1220: } else
1221: status = SSH2_FX_OK;
1222: } else if (stat(newpath, &sb) == -1) {
1223: if (rename(oldpath, newpath) == -1)
1224: status = errno_to_portable(errno);
1225: else
1226: status = SSH2_FX_OK;
1227: }
1.1 markus 1228: send_status(id, status);
1.97 djm 1229: free(oldpath);
1230: free(newpath);
1.1 markus 1231: }
1232:
1.28 itojun 1233: static void
1.98 djm 1234: process_readlink(u_int32_t id)
1.23 djm 1235: {
1.104 djm 1236: int r, len;
1.105 deraadt 1237: char buf[PATH_MAX];
1.23 djm 1238: char *path;
1239:
1.104 djm 1240: if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
1.120 djm 1241: fatal_fr(r, "parse");
1.104 djm 1242:
1.58 djm 1243: debug3("request %u: readlink", id);
1244: verbose("readlink \"%s\"", path);
1.46 avsm 1245: if ((len = readlink(path, buf, sizeof(buf) - 1)) == -1)
1.23 djm 1246: send_status(id, errno_to_portable(errno));
1247: else {
1248: Stat s;
1.31 deraadt 1249:
1.46 avsm 1250: buf[len] = '\0';
1.23 djm 1251: attrib_clear(&s.attrib);
1.46 avsm 1252: s.name = s.long_name = buf;
1.23 djm 1253: send_names(id, 1, &s);
1254: }
1.97 djm 1255: free(path);
1.23 djm 1256: }
1257:
1.28 itojun 1258: static void
1.98 djm 1259: process_symlink(u_int32_t id)
1.23 djm 1260: {
1261: char *oldpath, *newpath;
1.104 djm 1262: int r, status;
1263:
1264: if ((r = sshbuf_get_cstring(iqueue, &oldpath, NULL)) != 0 ||
1265: (r = sshbuf_get_cstring(iqueue, &newpath, NULL)) != 0)
1.120 djm 1266: fatal_fr(r, "parse");
1.23 djm 1267:
1.58 djm 1268: debug3("request %u: symlink", id);
1269: logit("symlink old \"%s\" new \"%s\"", oldpath, newpath);
1.39 markus 1270: /* this will fail if 'newpath' exists */
1.104 djm 1271: r = symlink(oldpath, newpath);
1272: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.23 djm 1273: send_status(id, status);
1.97 djm 1274: free(oldpath);
1275: free(newpath);
1.23 djm 1276: }
1277:
1.28 itojun 1278: static void
1.78 djm 1279: process_extended_posix_rename(u_int32_t id)
1280: {
1281: char *oldpath, *newpath;
1.104 djm 1282: int r, status;
1283:
1284: if ((r = sshbuf_get_cstring(iqueue, &oldpath, NULL)) != 0 ||
1285: (r = sshbuf_get_cstring(iqueue, &newpath, NULL)) != 0)
1.120 djm 1286: fatal_fr(r, "parse");
1.78 djm 1287:
1288: debug3("request %u: posix-rename", id);
1289: logit("posix-rename old \"%s\" new \"%s\"", oldpath, newpath);
1.104 djm 1290: r = rename(oldpath, newpath);
1291: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.90 djm 1292: send_status(id, status);
1.97 djm 1293: free(oldpath);
1294: free(newpath);
1.78 djm 1295: }
1296:
1297: static void
1.79 djm 1298: process_extended_statvfs(u_int32_t id)
1299: {
1300: char *path;
1301: struct statvfs st;
1.104 djm 1302: int r;
1.79 djm 1303:
1.104 djm 1304: if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
1.120 djm 1305: fatal_fr(r, "parse");
1.103 dtucker 1306: debug3("request %u: statvfs", id);
1307: logit("statvfs \"%s\"", path);
1.79 djm 1308:
1309: if (statvfs(path, &st) != 0)
1310: send_status(id, errno_to_portable(errno));
1311: else
1312: send_statvfs(id, &st);
1.97 djm 1313: free(path);
1.79 djm 1314: }
1315:
1316: static void
1317: process_extended_fstatvfs(u_int32_t id)
1318: {
1.104 djm 1319: int r, handle, fd;
1.79 djm 1320: struct statvfs st;
1321:
1.104 djm 1322: if ((r = get_handle(iqueue, &handle)) != 0)
1.120 djm 1323: fatal_fr(r, "parse");
1.79 djm 1324: debug("request %u: fstatvfs \"%s\" (handle %u)",
1325: id, handle_to_name(handle), handle);
1326: if ((fd = handle_to_fd(handle)) < 0) {
1327: send_status(id, SSH2_FX_FAILURE);
1328: return;
1329: }
1330: if (fstatvfs(fd, &st) != 0)
1331: send_status(id, errno_to_portable(errno));
1332: else
1333: send_statvfs(id, &st);
1334: }
1335:
1336: static void
1.93 djm 1337: process_extended_hardlink(u_int32_t id)
1338: {
1339: char *oldpath, *newpath;
1.104 djm 1340: int r, status;
1341:
1342: if ((r = sshbuf_get_cstring(iqueue, &oldpath, NULL)) != 0 ||
1343: (r = sshbuf_get_cstring(iqueue, &newpath, NULL)) != 0)
1.120 djm 1344: fatal_fr(r, "parse");
1.93 djm 1345:
1346: debug3("request %u: hardlink", id);
1347: logit("hardlink old \"%s\" new \"%s\"", oldpath, newpath);
1.104 djm 1348: r = link(oldpath, newpath);
1349: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.93 djm 1350: send_status(id, status);
1.97 djm 1351: free(oldpath);
1352: free(newpath);
1.102 djm 1353: }
1354:
1355: static void
1356: process_extended_fsync(u_int32_t id)
1357: {
1.104 djm 1358: int handle, fd, r, status = SSH2_FX_OP_UNSUPPORTED;
1.102 djm 1359:
1.104 djm 1360: if ((r = get_handle(iqueue, &handle)) != 0)
1.120 djm 1361: fatal_fr(r, "parse");
1.102 djm 1362: debug3("request %u: fsync (handle %u)", id, handle);
1363: verbose("fsync \"%s\"", handle_to_name(handle));
1364: if ((fd = handle_to_fd(handle)) < 0)
1365: status = SSH2_FX_NO_SUCH_FILE;
1366: else if (handle_is_ok(handle, HANDLE_FILE)) {
1.104 djm 1367: r = fsync(fd);
1368: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.102 djm 1369: }
1370: send_status(id, status);
1.114 djm 1371: }
1372:
1373: static void
1374: process_extended_lsetstat(u_int32_t id)
1375: {
1376: Attrib a;
1377: char *name;
1378: int r, status = SSH2_FX_OK;
1379:
1380: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0 ||
1381: (r = decode_attrib(iqueue, &a)) != 0)
1.120 djm 1382: fatal_fr(r, "parse");
1.114 djm 1383:
1384: debug("request %u: lsetstat name \"%s\"", id, name);
1385: if (a.flags & SSH2_FILEXFER_ATTR_SIZE) {
1386: /* nonsensical for links */
1387: status = SSH2_FX_BAD_MESSAGE;
1388: goto out;
1389: }
1390: if (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
1391: logit("set \"%s\" mode %04o", name, a.perm);
1392: r = fchmodat(AT_FDCWD, name,
1393: a.perm & 07777, AT_SYMLINK_NOFOLLOW);
1394: if (r == -1)
1395: status = errno_to_portable(errno);
1396: }
1397: if (a.flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
1398: char buf[64];
1399: time_t t = a.mtime;
1400:
1401: strftime(buf, sizeof(buf), "%Y%m%d-%H:%M:%S",
1402: localtime(&t));
1403: logit("set \"%s\" modtime %s", name, buf);
1404: r = utimensat(AT_FDCWD, name,
1405: attrib_to_ts(&a), AT_SYMLINK_NOFOLLOW);
1406: if (r == -1)
1407: status = errno_to_portable(errno);
1408: }
1409: if (a.flags & SSH2_FILEXFER_ATTR_UIDGID) {
1410: logit("set \"%s\" owner %lu group %lu", name,
1411: (u_long)a.uid, (u_long)a.gid);
1412: r = fchownat(AT_FDCWD, name, a.uid, a.gid,
1413: AT_SYMLINK_NOFOLLOW);
1414: if (r == -1)
1415: status = errno_to_portable(errno);
1416: }
1417: out:
1418: send_status(id, status);
1419: free(name);
1.122 ! djm 1420: }
! 1421:
! 1422: static void
! 1423: process_extended_limits(u_int32_t id)
! 1424: {
! 1425: struct sshbuf *msg;
! 1426: int r;
! 1427: uint64_t nfiles = 0;
! 1428: struct rlimit rlim;
! 1429:
! 1430: debug("request %u: limits", id);
! 1431:
! 1432: if (getrlimit(RLIMIT_NOFILE, &rlim) != -1 && rlim.rlim_cur > 5)
! 1433: nfiles = rlim.rlim_cur - 5; /* stdio(3) + syslog + spare */
! 1434:
! 1435: if ((msg = sshbuf_new()) == NULL)
! 1436: fatal_f("sshbuf_new failed");
! 1437: if ((r = sshbuf_put_u8(msg, SSH2_FXP_EXTENDED_REPLY)) != 0 ||
! 1438: (r = sshbuf_put_u32(msg, id)) != 0 ||
! 1439: /* max-packet-length */
! 1440: (r = sshbuf_put_u64(msg, SFTP_MAX_MSG_LENGTH)) != 0 ||
! 1441: /* max-read-length */
! 1442: (r = sshbuf_put_u64(msg, SFTP_MAX_READ_LENGTH)) != 0 ||
! 1443: /* max-write-length */
! 1444: (r = sshbuf_put_u64(msg, SFTP_MAX_MSG_LENGTH - 1024)) != 0 ||
! 1445: /* max-open-handles */
! 1446: (r = sshbuf_put_u64(msg, nfiles)) != 0)
! 1447: fatal_fr(r, "compose");
! 1448: send_msg(msg);
! 1449: sshbuf_free(msg);
1.93 djm 1450: }
1451:
1452: static void
1.98 djm 1453: process_extended(u_int32_t id)
1.10 markus 1454: {
1455: char *request;
1.104 djm 1456: int i, r;
1.10 markus 1457:
1.104 djm 1458: if ((r = sshbuf_get_cstring(iqueue, &request, NULL)) != 0)
1.120 djm 1459: fatal_fr(r, "parse");
1.98 djm 1460: for (i = 0; extended_handlers[i].handler != NULL; i++) {
1461: if (strcmp(request, extended_handlers[i].ext_name) == 0) {
1462: if (!request_permitted(&extended_handlers[i]))
1463: send_status(id, SSH2_FX_PERMISSION_DENIED);
1464: else
1465: extended_handlers[i].handler(id);
1466: break;
1467: }
1468: }
1469: if (extended_handlers[i].handler == NULL) {
1470: error("Unknown extended request \"%.100s\"", request);
1.78 djm 1471: send_status(id, SSH2_FX_OP_UNSUPPORTED); /* MUST */
1.98 djm 1472: }
1.97 djm 1473: free(request);
1.10 markus 1474: }
1.1 markus 1475:
1476: /* stolen from ssh-agent */
1477:
1.28 itojun 1478: static void
1.1 markus 1479: process(void)
1480: {
1.104 djm 1481: u_int msg_len;
1482: u_int buf_len;
1483: u_int consumed;
1484: u_char type;
1485: const u_char *cp;
1486: int i, r;
1.98 djm 1487: u_int32_t id;
1.1 markus 1488:
1.104 djm 1489: buf_len = sshbuf_len(iqueue);
1.34 markus 1490: if (buf_len < 5)
1.1 markus 1491: return; /* Incomplete message. */
1.104 djm 1492: cp = sshbuf_ptr(iqueue);
1.57 djm 1493: msg_len = get_u32(cp);
1.50 djm 1494: if (msg_len > SFTP_MAX_MSG_LENGTH) {
1.58 djm 1495: error("bad message from %s local user %s",
1496: client_addr, pw->pw_name);
1.76 markus 1497: sftp_server_cleanup_exit(11);
1.1 markus 1498: }
1.34 markus 1499: if (buf_len < msg_len + 4)
1.1 markus 1500: return;
1.104 djm 1501: if ((r = sshbuf_consume(iqueue, 4)) != 0)
1.120 djm 1502: fatal_fr(r, "consume");
1.34 markus 1503: buf_len -= 4;
1.104 djm 1504: if ((r = sshbuf_get_u8(iqueue, &type)) != 0)
1.120 djm 1505: fatal_fr(r, "parse type");
1.98 djm 1506:
1.1 markus 1507: switch (type) {
1.10 markus 1508: case SSH2_FXP_INIT:
1.1 markus 1509: process_init();
1.98 djm 1510: init_done = 1;
1.1 markus 1511: break;
1.10 markus 1512: case SSH2_FXP_EXTENDED:
1.98 djm 1513: if (!init_done)
1514: fatal("Received extended request before init");
1.104 djm 1515: if ((r = sshbuf_get_u32(iqueue, &id)) != 0)
1.120 djm 1516: fatal_fr(r, "parse extended ID");
1.98 djm 1517: process_extended(id);
1.10 markus 1518: break;
1.1 markus 1519: default:
1.98 djm 1520: if (!init_done)
1521: fatal("Received %u request before init", type);
1.104 djm 1522: if ((r = sshbuf_get_u32(iqueue, &id)) != 0)
1.120 djm 1523: fatal_fr(r, "parse ID");
1.98 djm 1524: for (i = 0; handlers[i].handler != NULL; i++) {
1525: if (type == handlers[i].type) {
1526: if (!request_permitted(&handlers[i])) {
1527: send_status(id,
1528: SSH2_FX_PERMISSION_DENIED);
1529: } else {
1530: handlers[i].handler(id);
1531: }
1532: break;
1533: }
1534: }
1535: if (handlers[i].handler == NULL)
1536: error("Unknown message %u", type);
1.1 markus 1537: }
1.34 markus 1538: /* discard the remaining bytes from the current packet */
1.104 djm 1539: if (buf_len < sshbuf_len(iqueue)) {
1.76 markus 1540: error("iqueue grew unexpectedly");
1541: sftp_server_cleanup_exit(255);
1542: }
1.104 djm 1543: consumed = buf_len - sshbuf_len(iqueue);
1.76 markus 1544: if (msg_len < consumed) {
1.98 djm 1545: error("msg_len %u < consumed %u", msg_len, consumed);
1.76 markus 1546: sftp_server_cleanup_exit(255);
1547: }
1.104 djm 1548: if (msg_len > consumed &&
1549: (r = sshbuf_consume(iqueue, msg_len - consumed)) != 0)
1.120 djm 1550: fatal_fr(r, "consume");
1.1 markus 1551: }
1552:
1.58 djm 1553: /* Cleanup handler that logs active handles upon normal exit */
1554: void
1.76 markus 1555: sftp_server_cleanup_exit(int i)
1.58 djm 1556: {
1557: if (pw != NULL && client_addr != NULL) {
1558: handle_log_exit();
1559: logit("session closed for local user %s from [%s]",
1560: pw->pw_name, client_addr);
1561: }
1562: _exit(i);
1563: }
1564:
1565: static void
1.76 markus 1566: sftp_server_usage(void)
1.58 djm 1567: {
1568: extern char *__progname;
1569:
1570: fprintf(stderr,
1.96 jmc 1571: "usage: %s [-ehR] [-d start_directory] [-f log_facility] "
1.118 djm 1572: "[-l log_level]\n\t[-P denied_requests] "
1573: "[-p allowed_requests] [-u umask]\n"
1.100 jmc 1574: " %s -Q protocol_feature\n",
1575: __progname, __progname);
1.58 djm 1576: exit(1);
1577: }
1578:
1.1 markus 1579: int
1.77 djm 1580: sftp_server_main(int argc, char **argv, struct passwd *user_pw)
1.1 markus 1581: {
1.21 millert 1582: fd_set *rset, *wset;
1.104 djm 1583: int i, r, in, out, max, ch, skipargs = 0, log_stderr = 0;
1.21 millert 1584: ssize_t len, olen, set_size;
1.58 djm 1585: SyslogFacility log_facility = SYSLOG_FACILITY_AUTH;
1.112 djm 1586: char *cp, *homedir = NULL, uidstr[32], buf[4*4096];
1.92 djm 1587: long mask;
1.58 djm 1588:
1589: extern char *optarg;
1590: extern char *__progname;
1.49 djm 1591:
1.58 djm 1592: log_init(__progname, log_level, log_facility, log_stderr);
1593:
1.95 djm 1594: pw = pwcopy(user_pw);
1595:
1.98 djm 1596: while (!skipargs && (ch = getopt(argc, argv,
1597: "d:f:l:P:p:Q:u:cehR")) != -1) {
1.58 djm 1598: switch (ch) {
1.98 djm 1599: case 'Q':
1600: if (strcasecmp(optarg, "requests") != 0) {
1601: fprintf(stderr, "Invalid query type\n");
1602: exit(1);
1603: }
1604: for (i = 0; handlers[i].handler != NULL; i++)
1605: printf("%s\n", handlers[i].name);
1606: for (i = 0; extended_handlers[i].handler != NULL; i++)
1607: printf("%s\n", extended_handlers[i].name);
1608: exit(0);
1609: break;
1.90 djm 1610: case 'R':
1611: readonly = 1;
1612: break;
1.58 djm 1613: case 'c':
1614: /*
1615: * Ignore all arguments if we are invoked as a
1.70 deraadt 1616: * shell using "sftp-server -c command"
1.58 djm 1617: */
1618: skipargs = 1;
1619: break;
1620: case 'e':
1621: log_stderr = 1;
1622: break;
1623: case 'l':
1624: log_level = log_level_number(optarg);
1625: if (log_level == SYSLOG_LEVEL_NOT_SET)
1626: error("Invalid log level \"%s\"", optarg);
1627: break;
1628: case 'f':
1629: log_facility = log_facility_number(optarg);
1.74 djm 1630: if (log_facility == SYSLOG_FACILITY_NOT_SET)
1.58 djm 1631: error("Invalid log facility \"%s\"", optarg);
1.86 djm 1632: break;
1.95 djm 1633: case 'd':
1634: cp = tilde_expand_filename(optarg, user_pw->pw_uid);
1.112 djm 1635: snprintf(uidstr, sizeof(uidstr), "%llu",
1636: (unsigned long long)pw->pw_uid);
1.95 djm 1637: homedir = percent_expand(cp, "d", user_pw->pw_dir,
1.112 djm 1638: "u", user_pw->pw_name, "U", uidstr, (char *)NULL);
1.95 djm 1639: free(cp);
1.98 djm 1640: break;
1641: case 'p':
1.118 djm 1642: if (request_allowlist != NULL)
1.98 djm 1643: fatal("Permitted requests already set");
1.118 djm 1644: request_allowlist = xstrdup(optarg);
1.98 djm 1645: break;
1646: case 'P':
1.118 djm 1647: if (request_denylist != NULL)
1.98 djm 1648: fatal("Refused requests already set");
1.118 djm 1649: request_denylist = xstrdup(optarg);
1.95 djm 1650: break;
1.86 djm 1651: case 'u':
1.92 djm 1652: errno = 0;
1653: mask = strtol(optarg, &cp, 8);
1654: if (mask < 0 || mask > 0777 || *cp != '\0' ||
1655: cp == optarg || (mask == 0 && errno != 0))
1656: fatal("Invalid umask \"%s\"", optarg);
1657: (void)umask((mode_t)mask);
1.58 djm 1658: break;
1659: case 'h':
1660: default:
1.76 markus 1661: sftp_server_usage();
1.58 djm 1662: }
1663: }
1664:
1665: log_init(__progname, log_level, log_facility, log_stderr);
1666:
1667: if ((cp = getenv("SSH_CONNECTION")) != NULL) {
1668: client_addr = xstrdup(cp);
1.76 markus 1669: if ((cp = strchr(client_addr, ' ')) == NULL) {
1670: error("Malformed SSH_CONNECTION variable: \"%s\"",
1.58 djm 1671: getenv("SSH_CONNECTION"));
1.76 markus 1672: sftp_server_cleanup_exit(255);
1673: }
1.58 djm 1674: *cp = '\0';
1675: } else
1676: client_addr = xstrdup("UNKNOWN");
1677:
1678: logit("session opened for local user %s from [%s]",
1679: pw->pw_name, client_addr);
1.10 markus 1680:
1.89 djm 1681: in = STDIN_FILENO;
1682: out = STDOUT_FILENO;
1.1 markus 1683:
1684: max = 0;
1685: if (in > max)
1686: max = in;
1687: if (out > max)
1688: max = out;
1689:
1.104 djm 1690: if ((iqueue = sshbuf_new()) == NULL)
1.120 djm 1691: fatal_f("sshbuf_new failed");
1.104 djm 1692: if ((oqueue = sshbuf_new()) == NULL)
1.120 djm 1693: fatal_f("sshbuf_new failed");
1.1 markus 1694:
1.108 logan 1695: rset = xcalloc(howmany(max + 1, NFDBITS), sizeof(fd_mask));
1696: wset = xcalloc(howmany(max + 1, NFDBITS), sizeof(fd_mask));
1.95 djm 1697:
1698: if (homedir != NULL) {
1699: if (chdir(homedir) != 0) {
1700: error("chdir to \"%s\" failed: %s", homedir,
1701: strerror(errno));
1702: }
1703: }
1.21 millert 1704:
1.108 logan 1705: set_size = howmany(max + 1, NFDBITS) * sizeof(fd_mask);
1.1 markus 1706: for (;;) {
1.21 millert 1707: memset(rset, 0, set_size);
1708: memset(wset, 0, set_size);
1.1 markus 1709:
1.73 djm 1710: /*
1711: * Ensure that we can read a full buffer and handle
1712: * the worst-case length packet it can generate,
1713: * otherwise apply backpressure by stopping reads.
1714: */
1.104 djm 1715: if ((r = sshbuf_check_reserve(iqueue, sizeof(buf))) == 0 &&
1716: (r = sshbuf_check_reserve(oqueue,
1717: SFTP_MAX_MSG_LENGTH)) == 0)
1.73 djm 1718: FD_SET(in, rset);
1.104 djm 1719: else if (r != SSH_ERR_NO_BUFFER_SPACE)
1.120 djm 1720: fatal_fr(r, "reserve");
1.73 djm 1721:
1.104 djm 1722: olen = sshbuf_len(oqueue);
1.1 markus 1723: if (olen > 0)
1.21 millert 1724: FD_SET(out, wset);
1.1 markus 1725:
1.116 deraadt 1726: if (select(max+1, rset, wset, NULL, NULL) == -1) {
1.1 markus 1727: if (errno == EINTR)
1728: continue;
1.58 djm 1729: error("select: %s", strerror(errno));
1.76 markus 1730: sftp_server_cleanup_exit(2);
1.1 markus 1731: }
1732:
1733: /* copy stdin to iqueue */
1.21 millert 1734: if (FD_ISSET(in, rset)) {
1.1 markus 1735: len = read(in, buf, sizeof buf);
1736: if (len == 0) {
1737: debug("read eof");
1.76 markus 1738: sftp_server_cleanup_exit(0);
1.116 deraadt 1739: } else if (len == -1) {
1.58 djm 1740: error("read: %s", strerror(errno));
1.76 markus 1741: sftp_server_cleanup_exit(1);
1.120 djm 1742: } else if ((r = sshbuf_put(iqueue, buf, len)) != 0)
1743: fatal_fr(r, "sshbuf_put");
1.1 markus 1744: }
1745: /* send oqueue to stdout */
1.21 millert 1746: if (FD_ISSET(out, wset)) {
1.104 djm 1747: len = write(out, sshbuf_ptr(oqueue), olen);
1.116 deraadt 1748: if (len == -1) {
1.58 djm 1749: error("write: %s", strerror(errno));
1.76 markus 1750: sftp_server_cleanup_exit(1);
1.120 djm 1751: } else if ((r = sshbuf_consume(oqueue, len)) != 0)
1752: fatal_fr(r, "consume");
1.1 markus 1753: }
1.73 djm 1754:
1755: /*
1756: * Process requests from client if we can fit the results
1757: * into the output buffer, otherwise stop processing input
1758: * and let the output queue drain.
1759: */
1.104 djm 1760: r = sshbuf_check_reserve(oqueue, SFTP_MAX_MSG_LENGTH);
1761: if (r == 0)
1.73 djm 1762: process();
1.104 djm 1763: else if (r != SSH_ERR_NO_BUFFER_SPACE)
1.120 djm 1764: fatal_fr(r, "reserve");
1.1 markus 1765: }
1766: }
![[BACK]](/icons/back.gif){kind=icon}
Return to sftp-server.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / ssh