Annotation of src/usr.bin/ssh/sftp-server.c, Revision 1.141
1.141 ! djm 1: /* $OpenBSD: sftp-server.c,v 1.140 2022/03/31 03:05:49 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>
1.132 deraadt 28: #include <poll.h>
1.68 stevesk 29: #include <stdlib.h>
1.69 stevesk 30: #include <stdio.h>
1.65 stevesk 31: #include <string.h>
1.70 deraadt 32: #include <pwd.h>
1.64 stevesk 33: #include <time.h>
1.63 stevesk 34: #include <unistd.h>
1.70 deraadt 35: #include <stdarg.h>
1.1 markus 36:
1.140 djm 37: #include "atomicio.h"
1.70 deraadt 38: #include "xmalloc.h"
1.104 djm 39: #include "sshbuf.h"
40: #include "ssherr.h"
1.14 markus 41: #include "log.h"
1.49 djm 42: #include "misc.h"
1.98 djm 43: #include "match.h"
1.58 djm 44: #include "uidswap.h"
1.1 markus 45:
1.10 markus 46: #include "sftp.h"
1.15 djm 47: #include "sftp-common.h"
1.1 markus 48:
1.117 djm 49: char *sftp_realpath(const char *, char *); /* sftp-realpath.c */
50:
1.122 djm 51: /* Maximum data read that we are willing to accept */
1.124 djm 52: #define SFTP_MAX_READ_LENGTH (SFTP_MAX_MSG_LENGTH - 1024)
1.122 djm 53:
1.58 djm 54: /* Our verbosity */
1.98 djm 55: static LogLevel log_level = SYSLOG_LEVEL_ERROR;
1.58 djm 56:
57: /* Our client */
1.98 djm 58: static struct passwd *pw = NULL;
59: static char *client_addr = NULL;
1.1 markus 60:
61: /* input and output queue */
1.104 djm 62: struct sshbuf *iqueue;
63: struct sshbuf *oqueue;
1.1 markus 64:
1.23 djm 65: /* Version of client */
1.98 djm 66: static u_int version;
67:
68: /* SSH2_FXP_INIT received */
69: static int init_done;
1.23 djm 70:
1.90 djm 71: /* Disable writes */
1.98 djm 72: static int readonly;
73:
74: /* Requests that are allowed/denied */
1.118 djm 75: static char *request_allowlist, *request_denylist;
1.90 djm 76:
1.43 miod 77: /* portable attributes, etc. */
1.1 markus 78: typedef struct Stat Stat;
79:
1.15 djm 80: struct Stat {
1.1 markus 81: char *name;
82: char *long_name;
83: Attrib attrib;
84: };
85:
1.98 djm 86: /* Packet handlers */
87: static void process_open(u_int32_t id);
88: static void process_close(u_int32_t id);
89: static void process_read(u_int32_t id);
90: static void process_write(u_int32_t id);
91: static void process_stat(u_int32_t id);
92: static void process_lstat(u_int32_t id);
93: static void process_fstat(u_int32_t id);
94: static void process_setstat(u_int32_t id);
95: static void process_fsetstat(u_int32_t id);
96: static void process_opendir(u_int32_t id);
97: static void process_readdir(u_int32_t id);
98: static void process_remove(u_int32_t id);
99: static void process_mkdir(u_int32_t id);
100: static void process_rmdir(u_int32_t id);
101: static void process_realpath(u_int32_t id);
102: static void process_rename(u_int32_t id);
103: static void process_readlink(u_int32_t id);
104: static void process_symlink(u_int32_t id);
105: static void process_extended_posix_rename(u_int32_t id);
106: static void process_extended_statvfs(u_int32_t id);
107: static void process_extended_fstatvfs(u_int32_t id);
108: static void process_extended_hardlink(u_int32_t id);
1.102 djm 109: static void process_extended_fsync(u_int32_t id);
1.114 djm 110: static void process_extended_lsetstat(u_int32_t id);
1.122 djm 111: static void process_extended_limits(u_int32_t id);
1.129 djm 112: static void process_extended_expand(u_int32_t id);
1.140 djm 113: static void process_extended_copy_data(u_int32_t id);
1.141 ! djm 114: static void process_extended_home_directory(u_int32_t id);
1.98 djm 115: static void process_extended(u_int32_t id);
116:
117: struct sftp_handler {
118: const char *name; /* user-visible name for fine-grained perms */
119: const char *ext_name; /* extended request name */
120: u_int type; /* packet type, for non extended packets */
121: void (*handler)(u_int32_t);
122: int does_write; /* if nonzero, banned for readonly mode */
123: };
124:
1.113 djm 125: static const struct sftp_handler handlers[] = {
1.98 djm 126: /* NB. SSH2_FXP_OPEN does the readonly check in the handler itself */
127: { "open", NULL, SSH2_FXP_OPEN, process_open, 0 },
128: { "close", NULL, SSH2_FXP_CLOSE, process_close, 0 },
129: { "read", NULL, SSH2_FXP_READ, process_read, 0 },
130: { "write", NULL, SSH2_FXP_WRITE, process_write, 1 },
131: { "lstat", NULL, SSH2_FXP_LSTAT, process_lstat, 0 },
132: { "fstat", NULL, SSH2_FXP_FSTAT, process_fstat, 0 },
133: { "setstat", NULL, SSH2_FXP_SETSTAT, process_setstat, 1 },
134: { "fsetstat", NULL, SSH2_FXP_FSETSTAT, process_fsetstat, 1 },
135: { "opendir", NULL, SSH2_FXP_OPENDIR, process_opendir, 0 },
136: { "readdir", NULL, SSH2_FXP_READDIR, process_readdir, 0 },
137: { "remove", NULL, SSH2_FXP_REMOVE, process_remove, 1 },
138: { "mkdir", NULL, SSH2_FXP_MKDIR, process_mkdir, 1 },
139: { "rmdir", NULL, SSH2_FXP_RMDIR, process_rmdir, 1 },
140: { "realpath", NULL, SSH2_FXP_REALPATH, process_realpath, 0 },
141: { "stat", NULL, SSH2_FXP_STAT, process_stat, 0 },
142: { "rename", NULL, SSH2_FXP_RENAME, process_rename, 1 },
143: { "readlink", NULL, SSH2_FXP_READLINK, process_readlink, 0 },
144: { "symlink", NULL, SSH2_FXP_SYMLINK, process_symlink, 1 },
145: { NULL, NULL, 0, NULL, 0 }
146: };
147:
148: /* SSH2_FXP_EXTENDED submessages */
1.113 djm 149: static const struct sftp_handler extended_handlers[] = {
1.98 djm 150: { "posix-rename", "posix-rename@openssh.com", 0,
1.127 djm 151: process_extended_posix_rename, 1 },
1.98 djm 152: { "statvfs", "statvfs@openssh.com", 0, process_extended_statvfs, 0 },
153: { "fstatvfs", "fstatvfs@openssh.com", 0, process_extended_fstatvfs, 0 },
154: { "hardlink", "hardlink@openssh.com", 0, process_extended_hardlink, 1 },
1.102 djm 155: { "fsync", "fsync@openssh.com", 0, process_extended_fsync, 1 },
1.114 djm 156: { "lsetstat", "lsetstat@openssh.com", 0, process_extended_lsetstat, 1 },
1.128 djm 157: { "limits", "limits@openssh.com", 0, process_extended_limits, 0 },
1.129 djm 158: { "expand-path", "expand-path@openssh.com", 0,
159: process_extended_expand, 0 },
1.140 djm 160: { "copy-data", "copy-data", 0, process_extended_copy_data, 1 },
1.141 ! djm 161: { "home-directory", "home-directory", 0,
! 162: process_extended_home_directory, 0 },
1.98 djm 163: { NULL, NULL, 0, NULL, 0 }
164: };
165:
1.125 djm 166: static const struct sftp_handler *
167: extended_handler_byname(const char *name)
168: {
169: int i;
170:
171: for (i = 0; extended_handlers[i].handler != NULL; i++) {
172: if (strcmp(name, extended_handlers[i].ext_name) == 0)
173: return &extended_handlers[i];
174: }
175: return NULL;
176: }
177:
1.98 djm 178: static int
1.113 djm 179: request_permitted(const struct sftp_handler *h)
1.98 djm 180: {
181: char *result;
182:
183: if (readonly && h->does_write) {
184: verbose("Refusing %s request in read-only mode", h->name);
185: return 0;
186: }
1.118 djm 187: if (request_denylist != NULL &&
188: ((result = match_list(h->name, request_denylist, NULL))) != NULL) {
1.98 djm 189: free(result);
1.118 djm 190: verbose("Refusing denylisted %s request", h->name);
1.98 djm 191: return 0;
192: }
1.118 djm 193: if (request_allowlist != NULL &&
194: ((result = match_list(h->name, request_allowlist, NULL))) != NULL) {
1.98 djm 195: free(result);
1.118 djm 196: debug2("Permitting allowlisted %s request", h->name);
1.98 djm 197: return 1;
198: }
1.118 djm 199: if (request_allowlist != NULL) {
200: verbose("Refusing non-allowlisted %s request", h->name);
1.98 djm 201: return 0;
202: }
203: return 1;
204: }
205:
1.28 itojun 206: static int
1.2 markus 207: errno_to_portable(int unixerrno)
1.1 markus 208: {
209: int ret = 0;
1.22 deraadt 210:
1.2 markus 211: switch (unixerrno) {
1.1 markus 212: case 0:
1.10 markus 213: ret = SSH2_FX_OK;
1.1 markus 214: break;
215: case ENOENT:
216: case ENOTDIR:
217: case EBADF:
218: case ELOOP:
1.10 markus 219: ret = SSH2_FX_NO_SUCH_FILE;
1.1 markus 220: break;
221: case EPERM:
222: case EACCES:
223: case EFAULT:
1.10 markus 224: ret = SSH2_FX_PERMISSION_DENIED;
1.1 markus 225: break;
226: case ENAMETOOLONG:
227: case EINVAL:
1.10 markus 228: ret = SSH2_FX_BAD_MESSAGE;
1.82 dtucker 229: break;
230: case ENOSYS:
231: ret = SSH2_FX_OP_UNSUPPORTED;
1.1 markus 232: break;
233: default:
1.10 markus 234: ret = SSH2_FX_FAILURE;
1.1 markus 235: break;
236: }
237: return ret;
238: }
239:
1.28 itojun 240: static int
1.1 markus 241: flags_from_portable(int pflags)
242: {
243: int flags = 0;
1.22 deraadt 244:
1.20 deraadt 245: if ((pflags & SSH2_FXF_READ) &&
246: (pflags & SSH2_FXF_WRITE)) {
1.1 markus 247: flags = O_RDWR;
1.10 markus 248: } else if (pflags & SSH2_FXF_READ) {
1.1 markus 249: flags = O_RDONLY;
1.10 markus 250: } else if (pflags & SSH2_FXF_WRITE) {
1.1 markus 251: flags = O_WRONLY;
252: }
1.101 djm 253: if (pflags & SSH2_FXF_APPEND)
254: flags |= O_APPEND;
1.10 markus 255: if (pflags & SSH2_FXF_CREAT)
1.1 markus 256: flags |= O_CREAT;
1.10 markus 257: if (pflags & SSH2_FXF_TRUNC)
1.1 markus 258: flags |= O_TRUNC;
1.10 markus 259: if (pflags & SSH2_FXF_EXCL)
1.1 markus 260: flags |= O_EXCL;
261: return flags;
262: }
263:
1.58 djm 264: static const char *
265: string_from_portable(int pflags)
266: {
267: static char ret[128];
268:
269: *ret = '\0';
270:
271: #define PAPPEND(str) { \
272: if (*ret != '\0') \
273: strlcat(ret, ",", sizeof(ret)); \
1.70 deraadt 274: strlcat(ret, str, sizeof(ret)); \
1.58 djm 275: }
276:
277: if (pflags & SSH2_FXF_READ)
278: PAPPEND("READ")
279: if (pflags & SSH2_FXF_WRITE)
280: PAPPEND("WRITE")
1.101 djm 281: if (pflags & SSH2_FXF_APPEND)
282: PAPPEND("APPEND")
1.58 djm 283: if (pflags & SSH2_FXF_CREAT)
284: PAPPEND("CREATE")
285: if (pflags & SSH2_FXF_TRUNC)
286: PAPPEND("TRUNCATE")
287: if (pflags & SSH2_FXF_EXCL)
288: PAPPEND("EXCL")
289:
290: return ret;
291: }
292:
1.1 markus 293: /* handle handles */
294:
295: typedef struct Handle Handle;
296: struct Handle {
297: int use;
298: DIR *dirp;
299: int fd;
1.101 djm 300: int flags;
1.1 markus 301: char *name;
1.58 djm 302: u_int64_t bytes_read, bytes_write;
1.75 djm 303: int next_unused;
1.1 markus 304: };
1.22 deraadt 305:
1.1 markus 306: enum {
307: HANDLE_UNUSED,
308: HANDLE_DIR,
309: HANDLE_FILE
310: };
1.22 deraadt 311:
1.113 djm 312: static Handle *handles = NULL;
313: static u_int num_handles = 0;
314: static int first_unused_handle = -1;
1.75 djm 315:
316: static void handle_unused(int i)
317: {
318: handles[i].use = HANDLE_UNUSED;
319: handles[i].next_unused = first_unused_handle;
320: first_unused_handle = i;
1.1 markus 321: }
322:
1.28 itojun 323: static int
1.101 djm 324: handle_new(int use, const char *name, int fd, int flags, DIR *dirp)
1.1 markus 325: {
1.75 djm 326: int i;
327:
328: if (first_unused_handle == -1) {
329: if (num_handles + 1 <= num_handles)
330: return -1;
331: num_handles++;
1.106 deraadt 332: handles = xreallocarray(handles, num_handles, sizeof(Handle));
1.75 djm 333: handle_unused(num_handles - 1);
334: }
335:
336: i = first_unused_handle;
337: first_unused_handle = handles[i].next_unused;
338:
339: handles[i].use = use;
340: handles[i].dirp = dirp;
341: handles[i].fd = fd;
1.101 djm 342: handles[i].flags = flags;
1.75 djm 343: handles[i].name = xstrdup(name);
344: handles[i].bytes_read = handles[i].bytes_write = 0;
1.22 deraadt 345:
1.75 djm 346: return i;
1.1 markus 347: }
348:
1.28 itojun 349: static int
1.1 markus 350: handle_is_ok(int i, int type)
351: {
1.75 djm 352: return i >= 0 && (u_int)i < num_handles && handles[i].use == type;
1.1 markus 353: }
354:
1.28 itojun 355: static int
1.104 djm 356: handle_to_string(int handle, u_char **stringp, int *hlenp)
1.1 markus 357: {
358: if (stringp == NULL || hlenp == NULL)
359: return -1;
1.13 markus 360: *stringp = xmalloc(sizeof(int32_t));
1.57 djm 361: put_u32(*stringp, handle);
1.13 markus 362: *hlenp = sizeof(int32_t);
1.1 markus 363: return 0;
364: }
365:
1.28 itojun 366: static int
1.104 djm 367: handle_from_string(const u_char *handle, u_int hlen)
1.1 markus 368: {
1.13 markus 369: int val;
1.22 deraadt 370:
1.13 markus 371: if (hlen != sizeof(int32_t))
1.1 markus 372: return -1;
1.57 djm 373: val = get_u32(handle);
1.1 markus 374: if (handle_is_ok(val, HANDLE_FILE) ||
375: handle_is_ok(val, HANDLE_DIR))
376: return val;
377: return -1;
378: }
379:
1.28 itojun 380: static char *
1.1 markus 381: handle_to_name(int handle)
382: {
383: if (handle_is_ok(handle, HANDLE_DIR)||
384: handle_is_ok(handle, HANDLE_FILE))
385: return handles[handle].name;
386: return NULL;
387: }
388:
1.28 itojun 389: static DIR *
1.1 markus 390: handle_to_dir(int handle)
391: {
392: if (handle_is_ok(handle, HANDLE_DIR))
393: return handles[handle].dirp;
394: return NULL;
395: }
396:
1.28 itojun 397: static int
1.1 markus 398: handle_to_fd(int handle)
399: {
1.17 stevesk 400: if (handle_is_ok(handle, HANDLE_FILE))
1.1 markus 401: return handles[handle].fd;
402: return -1;
403: }
404:
1.101 djm 405: static int
406: handle_to_flags(int handle)
407: {
408: if (handle_is_ok(handle, HANDLE_FILE))
409: return handles[handle].flags;
410: return 0;
411: }
412:
1.58 djm 413: static void
414: handle_update_read(int handle, ssize_t bytes)
415: {
416: if (handle_is_ok(handle, HANDLE_FILE) && bytes > 0)
417: handles[handle].bytes_read += bytes;
418: }
419:
420: static void
421: handle_update_write(int handle, ssize_t bytes)
422: {
423: if (handle_is_ok(handle, HANDLE_FILE) && bytes > 0)
424: handles[handle].bytes_write += bytes;
425: }
426:
427: static u_int64_t
428: handle_bytes_read(int handle)
429: {
430: if (handle_is_ok(handle, HANDLE_FILE))
431: return (handles[handle].bytes_read);
432: return 0;
433: }
434:
435: static u_int64_t
436: handle_bytes_write(int handle)
437: {
438: if (handle_is_ok(handle, HANDLE_FILE))
439: return (handles[handle].bytes_write);
440: return 0;
441: }
442:
1.28 itojun 443: static int
1.1 markus 444: handle_close(int handle)
445: {
446: int ret = -1;
1.22 deraadt 447:
1.1 markus 448: if (handle_is_ok(handle, HANDLE_FILE)) {
449: ret = close(handles[handle].fd);
1.97 djm 450: free(handles[handle].name);
1.75 djm 451: handle_unused(handle);
1.1 markus 452: } else if (handle_is_ok(handle, HANDLE_DIR)) {
453: ret = closedir(handles[handle].dirp);
1.97 djm 454: free(handles[handle].name);
1.75 djm 455: handle_unused(handle);
1.1 markus 456: } else {
457: errno = ENOENT;
458: }
459: return ret;
460: }
461:
1.58 djm 462: static void
463: handle_log_close(int handle, char *emsg)
464: {
465: if (handle_is_ok(handle, HANDLE_FILE)) {
466: logit("%s%sclose \"%s\" bytes read %llu written %llu",
467: emsg == NULL ? "" : emsg, emsg == NULL ? "" : " ",
468: handle_to_name(handle),
1.72 stevesk 469: (unsigned long long)handle_bytes_read(handle),
470: (unsigned long long)handle_bytes_write(handle));
1.58 djm 471: } else {
472: logit("%s%sclosedir \"%s\"",
473: emsg == NULL ? "" : emsg, emsg == NULL ? "" : " ",
474: handle_to_name(handle));
475: }
476: }
477:
478: static void
479: handle_log_exit(void)
480: {
481: u_int i;
482:
1.75 djm 483: for (i = 0; i < num_handles; i++)
1.58 djm 484: if (handles[i].use != HANDLE_UNUSED)
485: handle_log_close(i, "forced");
486: }
487:
1.28 itojun 488: static int
1.104 djm 489: get_handle(struct sshbuf *queue, int *hp)
1.1 markus 490: {
1.104 djm 491: u_char *handle;
492: int r;
493: size_t hlen;
494:
495: *hp = -1;
496: if ((r = sshbuf_get_string(queue, &handle, &hlen)) != 0)
497: return r;
1.10 markus 498: if (hlen < 256)
1.104 djm 499: *hp = handle_from_string(handle, hlen);
1.97 djm 500: free(handle);
1.104 djm 501: return 0;
1.1 markus 502: }
503:
504: /* send replies */
505:
1.28 itojun 506: static void
1.104 djm 507: send_msg(struct sshbuf *m)
1.1 markus 508: {
1.104 djm 509: int r;
1.22 deraadt 510:
1.104 djm 511: if ((r = sshbuf_put_stringb(oqueue, m)) != 0)
1.120 djm 512: fatal_fr(r, "enqueue");
1.104 djm 513: sshbuf_reset(m);
1.1 markus 514: }
515:
1.58 djm 516: static const char *
517: status_to_message(u_int32_t status)
1.1 markus 518: {
1.139 djm 519: static const char * const status_messages[] = {
1.23 djm 520: "Success", /* SSH_FX_OK */
521: "End of file", /* SSH_FX_EOF */
522: "No such file", /* SSH_FX_NO_SUCH_FILE */
523: "Permission denied", /* SSH_FX_PERMISSION_DENIED */
524: "Failure", /* SSH_FX_FAILURE */
525: "Bad message", /* SSH_FX_BAD_MESSAGE */
526: "No connection", /* SSH_FX_NO_CONNECTION */
527: "Connection lost", /* SSH_FX_CONNECTION_LOST */
528: "Operation unsupported", /* SSH_FX_OP_UNSUPPORTED */
529: "Unknown error" /* Others */
530: };
1.110 deraadt 531: return (status_messages[MINIMUM(status,SSH2_FX_MAX)]);
1.58 djm 532: }
1.22 deraadt 533:
1.58 djm 534: static void
1.136 djm 535: send_status_errmsg(u_int32_t id, u_int32_t status, const char *errmsg)
1.58 djm 536: {
1.104 djm 537: struct sshbuf *msg;
538: int r;
1.58 djm 539:
540: debug3("request %u: sent status %u", id, status);
541: if (log_level > SYSLOG_LEVEL_VERBOSE ||
542: (status != SSH2_FX_OK && status != SSH2_FX_EOF))
543: logit("sent status %s", status_to_message(status));
1.104 djm 544: if ((msg = sshbuf_new()) == NULL)
1.120 djm 545: fatal_f("sshbuf_new failed");
1.104 djm 546: if ((r = sshbuf_put_u8(msg, SSH2_FXP_STATUS)) != 0 ||
547: (r = sshbuf_put_u32(msg, id)) != 0 ||
548: (r = sshbuf_put_u32(msg, status)) != 0)
1.120 djm 549: fatal_fr(r, "compose");
1.23 djm 550: if (version >= 3) {
1.136 djm 551: if ((r = sshbuf_put_cstring(msg, errmsg == NULL ?
552: status_to_message(status) : errmsg)) != 0 ||
1.104 djm 553: (r = sshbuf_put_cstring(msg, "")) != 0)
1.120 djm 554: fatal_fr(r, "compose message");
1.23 djm 555: }
1.104 djm 556: send_msg(msg);
557: sshbuf_free(msg);
1.1 markus 558: }
1.136 djm 559:
560: static void
561: send_status(u_int32_t id, u_int32_t status)
562: {
1.137 dtucker 563: send_status_errmsg(id, status, NULL);
1.136 djm 564: }
565:
1.28 itojun 566: static void
1.104 djm 567: send_data_or_handle(char type, u_int32_t id, const u_char *data, int dlen)
1.1 markus 568: {
1.104 djm 569: struct sshbuf *msg;
570: int r;
1.22 deraadt 571:
1.104 djm 572: if ((msg = sshbuf_new()) == NULL)
1.120 djm 573: fatal_f("sshbuf_new failed");
1.104 djm 574: if ((r = sshbuf_put_u8(msg, type)) != 0 ||
575: (r = sshbuf_put_u32(msg, id)) != 0 ||
576: (r = sshbuf_put_string(msg, data, dlen)) != 0)
1.120 djm 577: fatal_fr(r, "compose");
1.104 djm 578: send_msg(msg);
579: sshbuf_free(msg);
1.1 markus 580: }
581:
1.28 itojun 582: static void
1.104 djm 583: send_data(u_int32_t id, const u_char *data, int dlen)
1.1 markus 584: {
1.58 djm 585: debug("request %u: sent data len %d", id, dlen);
1.10 markus 586: send_data_or_handle(SSH2_FXP_DATA, id, data, dlen);
1.1 markus 587: }
588:
1.28 itojun 589: static void
1.1 markus 590: send_handle(u_int32_t id, int handle)
591: {
1.104 djm 592: u_char *string;
1.1 markus 593: int hlen;
1.22 deraadt 594:
1.1 markus 595: handle_to_string(handle, &string, &hlen);
1.58 djm 596: debug("request %u: sent handle handle %d", id, handle);
1.10 markus 597: send_data_or_handle(SSH2_FXP_HANDLE, id, string, hlen);
1.97 djm 598: free(string);
1.1 markus 599: }
600:
1.28 itojun 601: static void
1.44 jakob 602: send_names(u_int32_t id, int count, const Stat *stats)
1.1 markus 603: {
1.104 djm 604: struct sshbuf *msg;
605: int i, r;
1.22 deraadt 606:
1.104 djm 607: if ((msg = sshbuf_new()) == NULL)
1.120 djm 608: fatal_f("sshbuf_new failed");
1.104 djm 609: if ((r = sshbuf_put_u8(msg, SSH2_FXP_NAME)) != 0 ||
610: (r = sshbuf_put_u32(msg, id)) != 0 ||
611: (r = sshbuf_put_u32(msg, count)) != 0)
1.120 djm 612: fatal_fr(r, "compose");
1.58 djm 613: debug("request %u: sent names count %d", id, count);
1.1 markus 614: for (i = 0; i < count; i++) {
1.104 djm 615: if ((r = sshbuf_put_cstring(msg, stats[i].name)) != 0 ||
616: (r = sshbuf_put_cstring(msg, stats[i].long_name)) != 0 ||
617: (r = encode_attrib(msg, &stats[i].attrib)) != 0)
1.120 djm 618: fatal_fr(r, "compose filenames/attrib");
1.1 markus 619: }
1.104 djm 620: send_msg(msg);
621: sshbuf_free(msg);
1.1 markus 622: }
623:
1.28 itojun 624: static void
1.44 jakob 625: send_attrib(u_int32_t id, const Attrib *a)
1.1 markus 626: {
1.104 djm 627: struct sshbuf *msg;
628: int r;
1.22 deraadt 629:
1.58 djm 630: debug("request %u: sent attrib have 0x%x", id, a->flags);
1.104 djm 631: if ((msg = sshbuf_new()) == NULL)
1.120 djm 632: fatal_f("sshbuf_new failed");
1.104 djm 633: if ((r = sshbuf_put_u8(msg, SSH2_FXP_ATTRS)) != 0 ||
634: (r = sshbuf_put_u32(msg, id)) != 0 ||
635: (r = encode_attrib(msg, a)) != 0)
1.120 djm 636: fatal_fr(r, "compose");
1.104 djm 637: send_msg(msg);
638: sshbuf_free(msg);
1.1 markus 639: }
640:
1.79 djm 641: static void
642: send_statvfs(u_int32_t id, struct statvfs *st)
643: {
1.104 djm 644: struct sshbuf *msg;
1.79 djm 645: u_int64_t flag;
1.104 djm 646: int r;
1.79 djm 647:
648: flag = (st->f_flag & ST_RDONLY) ? SSH2_FXE_STATVFS_ST_RDONLY : 0;
649: flag |= (st->f_flag & ST_NOSUID) ? SSH2_FXE_STATVFS_ST_NOSUID : 0;
650:
1.104 djm 651: if ((msg = sshbuf_new()) == NULL)
1.120 djm 652: fatal_f("sshbuf_new failed");
1.104 djm 653: if ((r = sshbuf_put_u8(msg, SSH2_FXP_EXTENDED_REPLY)) != 0 ||
654: (r = sshbuf_put_u32(msg, id)) != 0 ||
655: (r = sshbuf_put_u64(msg, st->f_bsize)) != 0 ||
656: (r = sshbuf_put_u64(msg, st->f_frsize)) != 0 ||
657: (r = sshbuf_put_u64(msg, st->f_blocks)) != 0 ||
658: (r = sshbuf_put_u64(msg, st->f_bfree)) != 0 ||
659: (r = sshbuf_put_u64(msg, st->f_bavail)) != 0 ||
660: (r = sshbuf_put_u64(msg, st->f_files)) != 0 ||
661: (r = sshbuf_put_u64(msg, st->f_ffree)) != 0 ||
662: (r = sshbuf_put_u64(msg, st->f_favail)) != 0 ||
663: (r = sshbuf_put_u64(msg, st->f_fsid)) != 0 ||
664: (r = sshbuf_put_u64(msg, flag)) != 0 ||
665: (r = sshbuf_put_u64(msg, st->f_namemax)) != 0)
1.120 djm 666: fatal_fr(r, "compose");
1.104 djm 667: send_msg(msg);
668: sshbuf_free(msg);
1.79 djm 669: }
670:
1.125 djm 671: /*
672: * Prepare SSH2_FXP_VERSION extension advertisement for a single extension.
1.135 jsg 673: * The extension is checked for permission prior to advertisement.
1.125 djm 674: */
675: static int
676: compose_extension(struct sshbuf *msg, const char *name, const char *ver)
677: {
678: int r;
679: const struct sftp_handler *exthnd;
680:
681: if ((exthnd = extended_handler_byname(name)) == NULL)
682: fatal_f("internal error: no handler for %s", name);
683: if (!request_permitted(exthnd)) {
684: debug2_f("refusing to advertise disallowed extension %s", name);
685: return 0;
686: }
687: if ((r = sshbuf_put_cstring(msg, name)) != 0 ||
688: (r = sshbuf_put_cstring(msg, ver)) != 0)
689: fatal_fr(r, "compose %s", name);
690: return 0;
691: }
692:
1.1 markus 693: /* parse incoming */
694:
1.28 itojun 695: static void
1.1 markus 696: process_init(void)
697: {
1.104 djm 698: struct sshbuf *msg;
699: int r;
1.1 markus 700:
1.104 djm 701: if ((r = sshbuf_get_u32(iqueue, &version)) != 0)
1.120 djm 702: fatal_fr(r, "parse");
1.94 djm 703: verbose("received client version %u", version);
1.104 djm 704: if ((msg = sshbuf_new()) == NULL)
1.120 djm 705: fatal_f("sshbuf_new failed");
1.104 djm 706: if ((r = sshbuf_put_u8(msg, SSH2_FXP_VERSION)) != 0 ||
1.125 djm 707: (r = sshbuf_put_u32(msg, SSH2_FILEXFER_VERSION)) != 0)
1.120 djm 708: fatal_fr(r, "compose");
1.125 djm 709:
1.135 jsg 710: /* extension advertisements */
1.125 djm 711: compose_extension(msg, "posix-rename@openssh.com", "1");
712: compose_extension(msg, "statvfs@openssh.com", "2");
713: compose_extension(msg, "fstatvfs@openssh.com", "2");
714: compose_extension(msg, "hardlink@openssh.com", "1");
715: compose_extension(msg, "fsync@openssh.com", "1");
716: compose_extension(msg, "lsetstat@openssh.com", "1");
717: compose_extension(msg, "limits@openssh.com", "1");
1.129 djm 718: compose_extension(msg, "expand-path@openssh.com", "1");
1.140 djm 719: compose_extension(msg, "copy-data", "1");
1.141 ! djm 720: compose_extension(msg, "home-directory", "1");
1.125 djm 721:
1.104 djm 722: send_msg(msg);
723: sshbuf_free(msg);
1.1 markus 724: }
725:
1.28 itojun 726: static void
1.98 djm 727: process_open(u_int32_t id)
1.1 markus 728: {
1.98 djm 729: u_int32_t pflags;
1.104 djm 730: Attrib a;
1.1 markus 731: char *name;
1.104 djm 732: int r, handle, fd, flags, mode, status = SSH2_FX_FAILURE;
733:
734: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0 ||
735: (r = sshbuf_get_u32(iqueue, &pflags)) != 0 || /* portable flags */
736: (r = decode_attrib(iqueue, &a)) != 0)
1.120 djm 737: fatal_fr(r, "parse");
1.1 markus 738:
1.61 djm 739: debug3("request %u: open flags %d", id, pflags);
1.1 markus 740: flags = flags_from_portable(pflags);
1.104 djm 741: mode = (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ? a.perm : 0666;
1.58 djm 742: logit("open \"%s\" flags %s mode 0%o",
743: name, string_from_portable(pflags), mode);
1.90 djm 744: if (readonly &&
1.111 djm 745: ((flags & O_ACCMODE) != O_RDONLY ||
746: (flags & (O_CREAT|O_TRUNC)) != 0)) {
1.98 djm 747: verbose("Refusing open request in read-only mode");
1.104 djm 748: status = SSH2_FX_PERMISSION_DENIED;
1.98 djm 749: } else {
1.90 djm 750: fd = open(name, flags, mode);
1.116 deraadt 751: if (fd == -1) {
1.90 djm 752: status = errno_to_portable(errno);
1.1 markus 753: } else {
1.101 djm 754: handle = handle_new(HANDLE_FILE, name, fd, flags, NULL);
1.90 djm 755: if (handle < 0) {
756: close(fd);
757: } else {
758: send_handle(id, handle);
759: status = SSH2_FX_OK;
760: }
1.1 markus 761: }
762: }
1.10 markus 763: if (status != SSH2_FX_OK)
1.1 markus 764: send_status(id, status);
1.97 djm 765: free(name);
1.1 markus 766: }
767:
1.28 itojun 768: static void
1.98 djm 769: process_close(u_int32_t id)
1.1 markus 770: {
1.104 djm 771: int r, handle, ret, status = SSH2_FX_FAILURE;
772:
773: if ((r = get_handle(iqueue, &handle)) != 0)
1.120 djm 774: fatal_fr(r, "parse");
1.1 markus 775:
1.58 djm 776: debug3("request %u: close handle %u", id, handle);
777: handle_log_close(handle, NULL);
1.1 markus 778: ret = handle_close(handle);
1.10 markus 779: status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.1 markus 780: send_status(id, status);
781: }
782:
1.28 itojun 783: static void
1.98 djm 784: process_read(u_int32_t id)
1.1 markus 785: {
1.124 djm 786: static u_char *buf;
787: static size_t buflen;
1.98 djm 788: u_int32_t len;
1.104 djm 789: int r, handle, fd, ret, status = SSH2_FX_FAILURE;
1.1 markus 790: u_int64_t off;
791:
1.104 djm 792: if ((r = get_handle(iqueue, &handle)) != 0 ||
793: (r = sshbuf_get_u64(iqueue, &off)) != 0 ||
794: (r = sshbuf_get_u32(iqueue, &len)) != 0)
1.120 djm 795: fatal_fr(r, "parse");
1.1 markus 796:
1.124 djm 797: debug("request %u: read \"%s\" (handle %d) off %llu len %u",
1.58 djm 798: id, handle_to_name(handle), handle, (unsigned long long)off, len);
1.124 djm 799: if ((fd = handle_to_fd(handle)) == -1)
800: goto out;
801: if (len > SFTP_MAX_READ_LENGTH) {
802: debug2("read change len %u to %u", len, SFTP_MAX_READ_LENGTH);
803: len = SFTP_MAX_READ_LENGTH;
804: }
805: if (len > buflen) {
806: debug3_f("allocate %zu => %u", buflen, len);
807: if ((buf = realloc(NULL, len)) == NULL)
808: fatal_f("realloc failed");
809: buflen = len;
810: }
811: if (lseek(fd, off, SEEK_SET) == -1) {
812: status = errno_to_portable(errno);
813: error_f("seek \"%.100s\": %s", handle_to_name(handle),
814: strerror(errno));
815: goto out;
816: }
817: if (len == 0) {
818: /* weird, but not strictly disallowed */
819: ret = 0;
820: } else if ((ret = read(fd, buf, len)) == -1) {
821: status = errno_to_portable(errno);
822: error_f("read \"%.100s\": %s", handle_to_name(handle),
823: strerror(errno));
824: goto out;
825: } else if (ret == 0) {
826: status = SSH2_FX_EOF;
827: goto out;
828: }
829: send_data(id, buf, ret);
830: handle_update_read(handle, ret);
831: /* success */
832: status = SSH2_FX_OK;
833: out:
1.10 markus 834: if (status != SSH2_FX_OK)
1.1 markus 835: send_status(id, status);
836: }
837:
1.28 itojun 838: static void
1.98 djm 839: process_write(u_int32_t id)
1.1 markus 840: {
841: u_int64_t off;
1.104 djm 842: size_t len;
843: int r, handle, fd, ret, status;
844: u_char *data;
845:
846: if ((r = get_handle(iqueue, &handle)) != 0 ||
847: (r = sshbuf_get_u64(iqueue, &off)) != 0 ||
848: (r = sshbuf_get_string(iqueue, &data, &len)) != 0)
1.120 djm 849: fatal_fr(r, "parse");
1.1 markus 850:
1.104 djm 851: debug("request %u: write \"%s\" (handle %d) off %llu len %zu",
1.58 djm 852: id, handle_to_name(handle), handle, (unsigned long long)off, len);
1.1 markus 853: fd = handle_to_fd(handle);
1.104 djm 854:
1.90 djm 855: if (fd < 0)
856: status = SSH2_FX_FAILURE;
857: else {
1.101 djm 858: if (!(handle_to_flags(handle) & O_APPEND) &&
1.123 djm 859: lseek(fd, off, SEEK_SET) == -1) {
1.1 markus 860: status = errno_to_portable(errno);
1.123 djm 861: error_f("seek \"%.100s\": %s", handle_to_name(handle),
862: strerror(errno));
1.1 markus 863: } else {
864: /* XXX ATOMICIO ? */
865: ret = write(fd, data, len);
1.116 deraadt 866: if (ret == -1) {
1.1 markus 867: status = errno_to_portable(errno);
1.123 djm 868: error_f("write \"%.100s\": %s",
869: handle_to_name(handle), strerror(errno));
1.48 djm 870: } else if ((size_t)ret == len) {
1.10 markus 871: status = SSH2_FX_OK;
1.58 djm 872: handle_update_write(handle, ret);
1.1 markus 873: } else {
1.120 djm 874: debug2_f("nothing at all written");
1.90 djm 875: status = SSH2_FX_FAILURE;
1.1 markus 876: }
877: }
878: }
879: send_status(id, status);
1.97 djm 880: free(data);
1.1 markus 881: }
882:
1.28 itojun 883: static void
1.98 djm 884: process_do_stat(u_int32_t id, int do_lstat)
1.1 markus 885: {
1.13 markus 886: Attrib a;
1.1 markus 887: struct stat st;
888: char *name;
1.104 djm 889: int r, status = SSH2_FX_FAILURE;
890:
891: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0)
1.120 djm 892: fatal_fr(r, "parse");
1.1 markus 893:
1.58 djm 894: debug3("request %u: %sstat", id, do_lstat ? "l" : "");
895: verbose("%sstat name \"%s\"", do_lstat ? "l" : "", name);
1.104 djm 896: r = do_lstat ? lstat(name, &st) : stat(name, &st);
1.116 deraadt 897: if (r == -1) {
1.1 markus 898: status = errno_to_portable(errno);
899: } else {
1.13 markus 900: stat_to_attrib(&st, &a);
901: send_attrib(id, &a);
1.10 markus 902: status = SSH2_FX_OK;
1.1 markus 903: }
1.10 markus 904: if (status != SSH2_FX_OK)
1.1 markus 905: send_status(id, status);
1.97 djm 906: free(name);
1.1 markus 907: }
908:
1.28 itojun 909: static void
1.98 djm 910: process_stat(u_int32_t id)
1.1 markus 911: {
1.98 djm 912: process_do_stat(id, 0);
1.1 markus 913: }
914:
1.28 itojun 915: static void
1.98 djm 916: process_lstat(u_int32_t id)
1.1 markus 917: {
1.98 djm 918: process_do_stat(id, 1);
1.1 markus 919: }
920:
1.28 itojun 921: static void
1.98 djm 922: process_fstat(u_int32_t id)
1.1 markus 923: {
1.13 markus 924: Attrib a;
1.1 markus 925: struct stat st;
1.104 djm 926: int fd, r, handle, status = SSH2_FX_FAILURE;
1.1 markus 927:
1.104 djm 928: if ((r = get_handle(iqueue, &handle)) != 0)
1.120 djm 929: fatal_fr(r, "parse");
1.58 djm 930: debug("request %u: fstat \"%s\" (handle %u)",
931: id, handle_to_name(handle), handle);
1.1 markus 932: fd = handle_to_fd(handle);
1.71 stevesk 933: if (fd >= 0) {
1.104 djm 934: r = fstat(fd, &st);
1.116 deraadt 935: if (r == -1) {
1.1 markus 936: status = errno_to_portable(errno);
937: } else {
1.13 markus 938: stat_to_attrib(&st, &a);
939: send_attrib(id, &a);
1.10 markus 940: status = SSH2_FX_OK;
1.1 markus 941: }
942: }
1.10 markus 943: if (status != SSH2_FX_OK)
1.1 markus 944: send_status(id, status);
945: }
946:
1.28 itojun 947: static struct timeval *
1.44 jakob 948: attrib_to_tv(const Attrib *a)
1.1 markus 949: {
950: static struct timeval tv[2];
1.22 deraadt 951:
1.1 markus 952: tv[0].tv_sec = a->atime;
953: tv[0].tv_usec = 0;
954: tv[1].tv_sec = a->mtime;
955: tv[1].tv_usec = 0;
956: return tv;
957: }
958:
1.114 djm 959: static struct timespec *
960: attrib_to_ts(const Attrib *a)
961: {
962: static struct timespec ts[2];
963:
964: ts[0].tv_sec = a->atime;
965: ts[0].tv_nsec = 0;
966: ts[1].tv_sec = a->mtime;
967: ts[1].tv_nsec = 0;
968: return ts;
969: }
970:
1.28 itojun 971: static void
1.98 djm 972: process_setstat(u_int32_t id)
1.1 markus 973: {
1.104 djm 974: Attrib a;
1.1 markus 975: char *name;
1.104 djm 976: int r, status = SSH2_FX_OK;
977:
978: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0 ||
979: (r = decode_attrib(iqueue, &a)) != 0)
1.120 djm 980: fatal_fr(r, "parse");
1.1 markus 981:
1.58 djm 982: debug("request %u: setstat name \"%s\"", id, name);
1.104 djm 983: if (a.flags & SSH2_FILEXFER_ATTR_SIZE) {
1.72 stevesk 984: logit("set \"%s\" size %llu",
1.104 djm 985: name, (unsigned long long)a.size);
986: r = truncate(name, a.size);
987: if (r == -1)
1.33 markus 988: status = errno_to_portable(errno);
989: }
1.104 djm 990: if (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
991: logit("set \"%s\" mode %04o", name, a.perm);
992: r = chmod(name, a.perm & 07777);
993: if (r == -1)
1.1 markus 994: status = errno_to_portable(errno);
995: }
1.104 djm 996: if (a.flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
1.58 djm 997: char buf[64];
1.104 djm 998: time_t t = a.mtime;
1.58 djm 999:
1000: strftime(buf, sizeof(buf), "%Y%m%d-%H:%M:%S",
1001: localtime(&t));
1002: logit("set \"%s\" modtime %s", name, buf);
1.104 djm 1003: r = utimes(name, attrib_to_tv(&a));
1004: if (r == -1)
1.1 markus 1005: status = errno_to_portable(errno);
1006: }
1.104 djm 1007: if (a.flags & SSH2_FILEXFER_ATTR_UIDGID) {
1.58 djm 1008: logit("set \"%s\" owner %lu group %lu", name,
1.104 djm 1009: (u_long)a.uid, (u_long)a.gid);
1010: r = chown(name, a.uid, a.gid);
1011: if (r == -1)
1.18 stevesk 1012: status = errno_to_portable(errno);
1013: }
1.1 markus 1014: send_status(id, status);
1.97 djm 1015: free(name);
1.1 markus 1016: }
1017:
1.28 itojun 1018: static void
1.98 djm 1019: process_fsetstat(u_int32_t id)
1.1 markus 1020: {
1.104 djm 1021: Attrib a;
1022: int handle, fd, r;
1.10 markus 1023: int status = SSH2_FX_OK;
1.1 markus 1024:
1.104 djm 1025: if ((r = get_handle(iqueue, &handle)) != 0 ||
1026: (r = decode_attrib(iqueue, &a)) != 0)
1.120 djm 1027: fatal_fr(r, "parse");
1.104 djm 1028:
1.58 djm 1029: debug("request %u: fsetstat handle %d", id, handle);
1.1 markus 1030: fd = handle_to_fd(handle);
1.90 djm 1031: if (fd < 0)
1.10 markus 1032: status = SSH2_FX_FAILURE;
1.90 djm 1033: else {
1.58 djm 1034: char *name = handle_to_name(handle);
1035:
1.104 djm 1036: if (a.flags & SSH2_FILEXFER_ATTR_SIZE) {
1.72 stevesk 1037: logit("set \"%s\" size %llu",
1.104 djm 1038: name, (unsigned long long)a.size);
1039: r = ftruncate(fd, a.size);
1040: if (r == -1)
1.33 markus 1041: status = errno_to_portable(errno);
1042: }
1.104 djm 1043: if (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
1044: logit("set \"%s\" mode %04o", name, a.perm);
1045: r = fchmod(fd, a.perm & 07777);
1046: if (r == -1)
1.1 markus 1047: status = errno_to_portable(errno);
1048: }
1.104 djm 1049: if (a.flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
1.58 djm 1050: char buf[64];
1.104 djm 1051: time_t t = a.mtime;
1.58 djm 1052:
1053: strftime(buf, sizeof(buf), "%Y%m%d-%H:%M:%S",
1054: localtime(&t));
1055: logit("set \"%s\" modtime %s", name, buf);
1.104 djm 1056: r = futimes(fd, attrib_to_tv(&a));
1057: if (r == -1)
1.18 stevesk 1058: status = errno_to_portable(errno);
1059: }
1.104 djm 1060: if (a.flags & SSH2_FILEXFER_ATTR_UIDGID) {
1.58 djm 1061: logit("set \"%s\" owner %lu group %lu", name,
1.104 djm 1062: (u_long)a.uid, (u_long)a.gid);
1063: r = fchown(fd, a.uid, a.gid);
1064: if (r == -1)
1.1 markus 1065: status = errno_to_portable(errno);
1066: }
1067: }
1068: send_status(id, status);
1069: }
1070:
1.28 itojun 1071: static void
1.98 djm 1072: process_opendir(u_int32_t id)
1.1 markus 1073: {
1074: DIR *dirp = NULL;
1075: char *path;
1.104 djm 1076: int r, handle, status = SSH2_FX_FAILURE;
1077:
1078: if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
1.120 djm 1079: fatal_fr(r, "parse");
1.1 markus 1080:
1.58 djm 1081: debug3("request %u: opendir", id);
1082: logit("opendir \"%s\"", path);
1.17 stevesk 1083: dirp = opendir(path);
1.1 markus 1084: if (dirp == NULL) {
1085: status = errno_to_portable(errno);
1086: } else {
1.101 djm 1087: handle = handle_new(HANDLE_DIR, path, 0, 0, dirp);
1.1 markus 1088: if (handle < 0) {
1089: closedir(dirp);
1090: } else {
1091: send_handle(id, handle);
1.10 markus 1092: status = SSH2_FX_OK;
1.1 markus 1093: }
1.17 stevesk 1094:
1.1 markus 1095: }
1.10 markus 1096: if (status != SSH2_FX_OK)
1.1 markus 1097: send_status(id, status);
1.97 djm 1098: free(path);
1.1 markus 1099: }
1100:
1.28 itojun 1101: static void
1.98 djm 1102: process_readdir(u_int32_t id)
1.1 markus 1103: {
1104: DIR *dirp;
1105: struct dirent *dp;
1106: char *path;
1.104 djm 1107: int r, handle;
1108:
1109: if ((r = get_handle(iqueue, &handle)) != 0)
1.120 djm 1110: fatal_fr(r, "parse");
1.1 markus 1111:
1.58 djm 1112: debug("request %u: readdir \"%s\" (handle %d)", id,
1113: handle_to_name(handle), handle);
1.1 markus 1114: dirp = handle_to_dir(handle);
1115: path = handle_to_name(handle);
1116: if (dirp == NULL || path == NULL) {
1.10 markus 1117: send_status(id, SSH2_FX_FAILURE);
1.1 markus 1118: } else {
1119: struct stat st;
1.105 deraadt 1120: char pathname[PATH_MAX];
1.1 markus 1121: Stat *stats;
1122: int nstats = 10, count = 0, i;
1.36 deraadt 1123:
1.54 djm 1124: stats = xcalloc(nstats, sizeof(Stat));
1.1 markus 1125: while ((dp = readdir(dirp)) != NULL) {
1126: if (count >= nstats) {
1127: nstats *= 2;
1.106 deraadt 1128: stats = xreallocarray(stats, nstats, sizeof(Stat));
1.1 markus 1129: }
1130: /* XXX OVERFLOW ? */
1.30 jakob 1131: snprintf(pathname, sizeof pathname, "%s%s%s", path,
1132: strcmp(path, "/") ? "/" : "", dp->d_name);
1.116 deraadt 1133: if (lstat(pathname, &st) == -1)
1.1 markus 1134: continue;
1.13 markus 1135: stat_to_attrib(&st, &(stats[count].attrib));
1.1 markus 1136: stats[count].name = xstrdup(dp->d_name);
1.91 djm 1137: stats[count].long_name = ls_file(dp->d_name, &st, 0, 0);
1.1 markus 1138: count++;
1139: /* send up to 100 entries in one message */
1.11 markus 1140: /* XXX check packet size instead */
1.1 markus 1141: if (count == 100)
1142: break;
1143: }
1.10 markus 1144: if (count > 0) {
1145: send_names(id, count, stats);
1.31 deraadt 1146: for (i = 0; i < count; i++) {
1.97 djm 1147: free(stats[i].name);
1148: free(stats[i].long_name);
1.10 markus 1149: }
1150: } else {
1151: send_status(id, SSH2_FX_EOF);
1.1 markus 1152: }
1.97 djm 1153: free(stats);
1.1 markus 1154: }
1155: }
1156:
1.28 itojun 1157: static void
1.98 djm 1158: process_remove(u_int32_t id)
1.1 markus 1159: {
1160: char *name;
1.104 djm 1161: int r, status = SSH2_FX_FAILURE;
1162:
1163: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0)
1.120 djm 1164: fatal_fr(r, "parse");
1.1 markus 1165:
1.58 djm 1166: debug3("request %u: remove", id);
1167: logit("remove name \"%s\"", name);
1.104 djm 1168: r = unlink(name);
1169: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.1 markus 1170: send_status(id, status);
1.97 djm 1171: free(name);
1.1 markus 1172: }
1173:
1.28 itojun 1174: static void
1.98 djm 1175: process_mkdir(u_int32_t id)
1.1 markus 1176: {
1.104 djm 1177: Attrib a;
1.1 markus 1178: char *name;
1.104 djm 1179: int r, mode, status = SSH2_FX_FAILURE;
1180:
1181: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0 ||
1182: (r = decode_attrib(iqueue, &a)) != 0)
1.120 djm 1183: fatal_fr(r, "parse");
1.1 markus 1184:
1.104 djm 1185: mode = (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ?
1186: a.perm & 07777 : 0777;
1.58 djm 1187: debug3("request %u: mkdir", id);
1188: logit("mkdir name \"%s\" mode 0%o", name, mode);
1.104 djm 1189: r = mkdir(name, mode);
1190: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.1 markus 1191: send_status(id, status);
1.97 djm 1192: free(name);
1.1 markus 1193: }
1194:
1.28 itojun 1195: static void
1.98 djm 1196: process_rmdir(u_int32_t id)
1.1 markus 1197: {
1198: char *name;
1.104 djm 1199: int r, status;
1200:
1201: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0)
1.120 djm 1202: fatal_fr(r, "parse");
1.1 markus 1203:
1.58 djm 1204: debug3("request %u: rmdir", id);
1205: logit("rmdir name \"%s\"", name);
1.104 djm 1206: r = rmdir(name);
1207: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.1 markus 1208: send_status(id, status);
1.97 djm 1209: free(name);
1.1 markus 1210: }
1211:
1.28 itojun 1212: static void
1.98 djm 1213: process_realpath(u_int32_t id)
1.1 markus 1214: {
1.105 deraadt 1215: char resolvedname[PATH_MAX];
1.1 markus 1216: char *path;
1.104 djm 1217: int r;
1218:
1219: if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
1.120 djm 1220: fatal_fr(r, "parse");
1.1 markus 1221:
1.7 markus 1222: if (path[0] == '\0') {
1.97 djm 1223: free(path);
1.7 markus 1224: path = xstrdup(".");
1225: }
1.58 djm 1226: debug3("request %u: realpath", id);
1227: verbose("realpath \"%s\"", path);
1.117 djm 1228: if (sftp_realpath(path, resolvedname) == NULL) {
1.1 markus 1229: send_status(id, errno_to_portable(errno));
1230: } else {
1231: Stat s;
1232: attrib_clear(&s.attrib);
1233: s.name = s.long_name = resolvedname;
1234: send_names(id, 1, &s);
1235: }
1.97 djm 1236: free(path);
1.1 markus 1237: }
1238:
1.28 itojun 1239: static void
1.98 djm 1240: process_rename(u_int32_t id)
1.1 markus 1241: {
1242: char *oldpath, *newpath;
1.104 djm 1243: int r, status;
1.41 deraadt 1244: struct stat sb;
1.1 markus 1245:
1.104 djm 1246: if ((r = sshbuf_get_cstring(iqueue, &oldpath, NULL)) != 0 ||
1247: (r = sshbuf_get_cstring(iqueue, &newpath, NULL)) != 0)
1.120 djm 1248: fatal_fr(r, "parse");
1.104 djm 1249:
1.58 djm 1250: debug3("request %u: rename", id);
1251: logit("rename old \"%s\" new \"%s\"", oldpath, newpath);
1.41 deraadt 1252: status = SSH2_FX_FAILURE;
1.98 djm 1253: if (lstat(oldpath, &sb) == -1)
1.39 markus 1254: status = errno_to_portable(errno);
1.41 deraadt 1255: else if (S_ISREG(sb.st_mode)) {
1256: /* Race-free rename of regular files */
1.47 dtucker 1257: if (link(oldpath, newpath) == -1) {
1258: if (errno == EOPNOTSUPP) {
1259: struct stat st;
1260:
1261: /*
1262: * fs doesn't support links, so fall back to
1263: * stat+rename. This is racy.
1264: */
1265: if (stat(newpath, &st) == -1) {
1266: if (rename(oldpath, newpath) == -1)
1267: status =
1268: errno_to_portable(errno);
1269: else
1270: status = SSH2_FX_OK;
1271: }
1272: } else {
1273: status = errno_to_portable(errno);
1274: }
1275: } else if (unlink(oldpath) == -1) {
1.41 deraadt 1276: status = errno_to_portable(errno);
1277: /* clean spare link */
1278: unlink(newpath);
1279: } else
1280: status = SSH2_FX_OK;
1281: } else if (stat(newpath, &sb) == -1) {
1282: if (rename(oldpath, newpath) == -1)
1283: status = errno_to_portable(errno);
1284: else
1285: status = SSH2_FX_OK;
1286: }
1.1 markus 1287: send_status(id, status);
1.97 djm 1288: free(oldpath);
1289: free(newpath);
1.1 markus 1290: }
1291:
1.28 itojun 1292: static void
1.98 djm 1293: process_readlink(u_int32_t id)
1.23 djm 1294: {
1.104 djm 1295: int r, len;
1.105 deraadt 1296: char buf[PATH_MAX];
1.23 djm 1297: char *path;
1298:
1.104 djm 1299: if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
1.120 djm 1300: fatal_fr(r, "parse");
1.104 djm 1301:
1.58 djm 1302: debug3("request %u: readlink", id);
1303: verbose("readlink \"%s\"", path);
1.46 avsm 1304: if ((len = readlink(path, buf, sizeof(buf) - 1)) == -1)
1.23 djm 1305: send_status(id, errno_to_portable(errno));
1306: else {
1307: Stat s;
1.31 deraadt 1308:
1.46 avsm 1309: buf[len] = '\0';
1.23 djm 1310: attrib_clear(&s.attrib);
1.46 avsm 1311: s.name = s.long_name = buf;
1.23 djm 1312: send_names(id, 1, &s);
1313: }
1.97 djm 1314: free(path);
1.23 djm 1315: }
1316:
1.28 itojun 1317: static void
1.98 djm 1318: process_symlink(u_int32_t id)
1.23 djm 1319: {
1320: char *oldpath, *newpath;
1.104 djm 1321: int r, status;
1322:
1323: if ((r = sshbuf_get_cstring(iqueue, &oldpath, NULL)) != 0 ||
1324: (r = sshbuf_get_cstring(iqueue, &newpath, NULL)) != 0)
1.120 djm 1325: fatal_fr(r, "parse");
1.23 djm 1326:
1.58 djm 1327: debug3("request %u: symlink", id);
1328: logit("symlink old \"%s\" new \"%s\"", oldpath, newpath);
1.39 markus 1329: /* this will fail if 'newpath' exists */
1.104 djm 1330: r = symlink(oldpath, newpath);
1331: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.23 djm 1332: send_status(id, status);
1.97 djm 1333: free(oldpath);
1334: free(newpath);
1.23 djm 1335: }
1336:
1.28 itojun 1337: static void
1.78 djm 1338: process_extended_posix_rename(u_int32_t id)
1339: {
1340: char *oldpath, *newpath;
1.104 djm 1341: int r, status;
1342:
1343: if ((r = sshbuf_get_cstring(iqueue, &oldpath, NULL)) != 0 ||
1344: (r = sshbuf_get_cstring(iqueue, &newpath, NULL)) != 0)
1.120 djm 1345: fatal_fr(r, "parse");
1.78 djm 1346:
1347: debug3("request %u: posix-rename", id);
1348: logit("posix-rename old \"%s\" new \"%s\"", oldpath, newpath);
1.104 djm 1349: r = rename(oldpath, newpath);
1350: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.90 djm 1351: send_status(id, status);
1.97 djm 1352: free(oldpath);
1353: free(newpath);
1.78 djm 1354: }
1355:
1356: static void
1.79 djm 1357: process_extended_statvfs(u_int32_t id)
1358: {
1359: char *path;
1360: struct statvfs st;
1.104 djm 1361: int r;
1.79 djm 1362:
1.104 djm 1363: if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
1.120 djm 1364: fatal_fr(r, "parse");
1.103 dtucker 1365: debug3("request %u: statvfs", id);
1366: logit("statvfs \"%s\"", path);
1.79 djm 1367:
1368: if (statvfs(path, &st) != 0)
1369: send_status(id, errno_to_portable(errno));
1370: else
1371: send_statvfs(id, &st);
1.127 djm 1372: free(path);
1.79 djm 1373: }
1374:
1375: static void
1376: process_extended_fstatvfs(u_int32_t id)
1377: {
1.104 djm 1378: int r, handle, fd;
1.79 djm 1379: struct statvfs st;
1380:
1.104 djm 1381: if ((r = get_handle(iqueue, &handle)) != 0)
1.120 djm 1382: fatal_fr(r, "parse");
1.79 djm 1383: debug("request %u: fstatvfs \"%s\" (handle %u)",
1384: id, handle_to_name(handle), handle);
1385: if ((fd = handle_to_fd(handle)) < 0) {
1386: send_status(id, SSH2_FX_FAILURE);
1387: return;
1388: }
1389: if (fstatvfs(fd, &st) != 0)
1390: send_status(id, errno_to_portable(errno));
1391: else
1392: send_statvfs(id, &st);
1393: }
1394:
1395: static void
1.93 djm 1396: process_extended_hardlink(u_int32_t id)
1397: {
1398: char *oldpath, *newpath;
1.104 djm 1399: int r, status;
1400:
1401: if ((r = sshbuf_get_cstring(iqueue, &oldpath, NULL)) != 0 ||
1402: (r = sshbuf_get_cstring(iqueue, &newpath, NULL)) != 0)
1.120 djm 1403: fatal_fr(r, "parse");
1.93 djm 1404:
1405: debug3("request %u: hardlink", id);
1406: logit("hardlink old \"%s\" new \"%s\"", oldpath, newpath);
1.104 djm 1407: r = link(oldpath, newpath);
1408: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.93 djm 1409: send_status(id, status);
1.97 djm 1410: free(oldpath);
1411: free(newpath);
1.102 djm 1412: }
1413:
1414: static void
1415: process_extended_fsync(u_int32_t id)
1416: {
1.104 djm 1417: int handle, fd, r, status = SSH2_FX_OP_UNSUPPORTED;
1.102 djm 1418:
1.104 djm 1419: if ((r = get_handle(iqueue, &handle)) != 0)
1.120 djm 1420: fatal_fr(r, "parse");
1.102 djm 1421: debug3("request %u: fsync (handle %u)", id, handle);
1422: verbose("fsync \"%s\"", handle_to_name(handle));
1423: if ((fd = handle_to_fd(handle)) < 0)
1424: status = SSH2_FX_NO_SUCH_FILE;
1425: else if (handle_is_ok(handle, HANDLE_FILE)) {
1.104 djm 1426: r = fsync(fd);
1427: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.102 djm 1428: }
1429: send_status(id, status);
1.114 djm 1430: }
1431:
1432: static void
1433: process_extended_lsetstat(u_int32_t id)
1434: {
1435: Attrib a;
1436: char *name;
1437: int r, status = SSH2_FX_OK;
1438:
1439: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0 ||
1440: (r = decode_attrib(iqueue, &a)) != 0)
1.120 djm 1441: fatal_fr(r, "parse");
1.114 djm 1442:
1443: debug("request %u: lsetstat name \"%s\"", id, name);
1444: if (a.flags & SSH2_FILEXFER_ATTR_SIZE) {
1445: /* nonsensical for links */
1446: status = SSH2_FX_BAD_MESSAGE;
1447: goto out;
1448: }
1449: if (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
1450: logit("set \"%s\" mode %04o", name, a.perm);
1451: r = fchmodat(AT_FDCWD, name,
1452: a.perm & 07777, AT_SYMLINK_NOFOLLOW);
1453: if (r == -1)
1454: status = errno_to_portable(errno);
1455: }
1456: if (a.flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
1457: char buf[64];
1458: time_t t = a.mtime;
1459:
1460: strftime(buf, sizeof(buf), "%Y%m%d-%H:%M:%S",
1461: localtime(&t));
1462: logit("set \"%s\" modtime %s", name, buf);
1463: r = utimensat(AT_FDCWD, name,
1464: attrib_to_ts(&a), AT_SYMLINK_NOFOLLOW);
1465: if (r == -1)
1466: status = errno_to_portable(errno);
1467: }
1468: if (a.flags & SSH2_FILEXFER_ATTR_UIDGID) {
1469: logit("set \"%s\" owner %lu group %lu", name,
1470: (u_long)a.uid, (u_long)a.gid);
1471: r = fchownat(AT_FDCWD, name, a.uid, a.gid,
1472: AT_SYMLINK_NOFOLLOW);
1473: if (r == -1)
1474: status = errno_to_portable(errno);
1475: }
1476: out:
1477: send_status(id, status);
1478: free(name);
1.122 djm 1479: }
1480:
1481: static void
1482: process_extended_limits(u_int32_t id)
1483: {
1484: struct sshbuf *msg;
1485: int r;
1486: uint64_t nfiles = 0;
1487: struct rlimit rlim;
1488:
1489: debug("request %u: limits", id);
1490:
1491: if (getrlimit(RLIMIT_NOFILE, &rlim) != -1 && rlim.rlim_cur > 5)
1492: nfiles = rlim.rlim_cur - 5; /* stdio(3) + syslog + spare */
1493:
1494: if ((msg = sshbuf_new()) == NULL)
1495: fatal_f("sshbuf_new failed");
1496: if ((r = sshbuf_put_u8(msg, SSH2_FXP_EXTENDED_REPLY)) != 0 ||
1497: (r = sshbuf_put_u32(msg, id)) != 0 ||
1498: /* max-packet-length */
1499: (r = sshbuf_put_u64(msg, SFTP_MAX_MSG_LENGTH)) != 0 ||
1500: /* max-read-length */
1501: (r = sshbuf_put_u64(msg, SFTP_MAX_READ_LENGTH)) != 0 ||
1502: /* max-write-length */
1503: (r = sshbuf_put_u64(msg, SFTP_MAX_MSG_LENGTH - 1024)) != 0 ||
1504: /* max-open-handles */
1505: (r = sshbuf_put_u64(msg, nfiles)) != 0)
1506: fatal_fr(r, "compose");
1507: send_msg(msg);
1508: sshbuf_free(msg);
1.129 djm 1509: }
1510:
1511: static void
1512: process_extended_expand(u_int32_t id)
1513: {
1514: char cwd[PATH_MAX], resolvedname[PATH_MAX];
1515: char *path, *npath;
1516: int r;
1517: Stat s;
1518:
1519: if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
1520: fatal_fr(r, "parse");
1521: if (getcwd(cwd, sizeof(cwd)) == NULL) {
1522: send_status(id, errno_to_portable(errno));
1523: goto out;
1524: }
1525:
1526: debug3("request %u: expand, original \"%s\"", id, path);
1527: if (path[0] == '\0') {
1528: /* empty path */
1529: free(path);
1530: path = xstrdup(".");
1531: } else if (*path == '~') {
1532: /* ~ expand path */
1533: /* Special-case for "~" and "~/" to respect homedir flag */
1534: if (strcmp(path, "~") == 0) {
1535: free(path);
1536: path = xstrdup(cwd);
1537: } else if (strncmp(path, "~/", 2) == 0) {
1538: npath = xstrdup(path + 2);
1539: free(path);
1540: xasprintf(&path, "%s/%s", cwd, npath);
1.130 dtucker 1541: free(npath);
1.129 djm 1542: } else {
1543: /* ~user expansions */
1544: if (tilde_expand(path, pw->pw_uid, &npath) != 0) {
1.138 djm 1545: send_status_errmsg(id,
1546: errno_to_portable(ENOENT), "no such user");
1.129 djm 1547: goto out;
1548: }
1549: free(path);
1550: path = npath;
1551: }
1552: } else if (*path != '/') {
1553: /* relative path */
1554: xasprintf(&npath, "%s/%s", cwd, path);
1555: free(path);
1556: path = npath;
1557: }
1558: verbose("expand \"%s\"", path);
1559: if (sftp_realpath(path, resolvedname) == NULL) {
1560: send_status(id, errno_to_portable(errno));
1561: goto out;
1562: }
1563: attrib_clear(&s.attrib);
1564: s.name = s.long_name = resolvedname;
1565: send_names(id, 1, &s);
1566: out:
1567: free(path);
1.140 djm 1568: }
1569:
1570: static void
1571: process_extended_copy_data(u_int32_t id)
1572: {
1573: u_char buf[64*1024];
1574: int read_handle, read_fd, write_handle, write_fd;
1575: u_int64_t len, read_off, read_len, write_off;
1576: int r, copy_until_eof, status = SSH2_FX_OP_UNSUPPORTED;
1577: size_t ret;
1578:
1579: if ((r = get_handle(iqueue, &read_handle)) != 0 ||
1580: (r = sshbuf_get_u64(iqueue, &read_off)) != 0 ||
1581: (r = sshbuf_get_u64(iqueue, &read_len)) != 0 ||
1582: (r = get_handle(iqueue, &write_handle)) != 0 ||
1583: (r = sshbuf_get_u64(iqueue, &write_off)) != 0)
1584: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1585:
1586: debug("request %u: copy-data from \"%s\" (handle %d) off %llu len %llu "
1587: "to \"%s\" (handle %d) off %llu",
1588: id, handle_to_name(read_handle), read_handle,
1589: (unsigned long long)read_off, (unsigned long long)read_len,
1590: handle_to_name(write_handle), write_handle,
1591: (unsigned long long)write_off);
1592:
1593: /* For read length of 0, we read until EOF. */
1594: if (read_len == 0) {
1595: read_len = (u_int64_t)-1 - read_off;
1596: copy_until_eof = 1;
1597: } else
1598: copy_until_eof = 0;
1599:
1600: read_fd = handle_to_fd(read_handle);
1601: write_fd = handle_to_fd(write_handle);
1602:
1603: /* Disallow reading & writing to the same handle or same path or dirs */
1604: if (read_handle == write_handle || read_fd < 0 || write_fd < 0 ||
1605: !strcmp(handle_to_name(read_handle), handle_to_name(write_handle))) {
1606: status = SSH2_FX_FAILURE;
1607: goto out;
1608: }
1609:
1610: if (lseek(read_fd, read_off, SEEK_SET) < 0) {
1611: status = errno_to_portable(errno);
1612: error("%s: read_seek failed", __func__);
1613: goto out;
1614: }
1615:
1616: if ((handle_to_flags(write_handle) & O_APPEND) == 0 &&
1617: lseek(write_fd, write_off, SEEK_SET) < 0) {
1618: status = errno_to_portable(errno);
1619: error("%s: write_seek failed", __func__);
1620: goto out;
1621: }
1622:
1623: /* Process the request in chunks. */
1624: while (read_len > 0 || copy_until_eof) {
1625: len = MINIMUM(sizeof(buf), read_len);
1626: read_len -= len;
1627:
1628: ret = atomicio(read, read_fd, buf, len);
1629: if (ret == 0 && errno == EPIPE) {
1630: status = copy_until_eof ? SSH2_FX_OK : SSH2_FX_EOF;
1631: break;
1632: } else if (ret == 0) {
1633: status = errno_to_portable(errno);
1634: error("%s: read failed: %s", __func__, strerror(errno));
1635: break;
1636: }
1637: len = ret;
1638: handle_update_read(read_handle, len);
1639:
1640: ret = atomicio(vwrite, write_fd, buf, len);
1641: if (ret != len) {
1642: status = errno_to_portable(errno);
1643: error("%s: write failed: %llu != %llu: %s", __func__,
1644: (unsigned long long)ret, (unsigned long long)len,
1645: strerror(errno));
1646: break;
1647: }
1648: handle_update_write(write_handle, len);
1649: }
1650:
1651: if (read_len == 0)
1652: status = SSH2_FX_OK;
1653:
1654: out:
1655: send_status(id, status);
1.141 ! djm 1656: }
! 1657:
! 1658: static void
! 1659: process_extended_home_directory(u_int32_t id)
! 1660: {
! 1661: char *username;
! 1662: struct passwd *user_pw;
! 1663: int r;
! 1664: Stat s;
! 1665:
! 1666: if ((r = sshbuf_get_cstring(iqueue, &username, NULL)) != 0)
! 1667: fatal_fr(r, "parse");
! 1668:
! 1669: debug3("request %u: home-directory \"%s\"", id, username);
! 1670: if ((user_pw = getpwnam(username)) == NULL) {
! 1671: send_status(id, errno_to_portable(errno));
! 1672: goto out;
! 1673: }
! 1674:
! 1675: verbose("home-directory \"%s\"", pw->pw_dir);
! 1676: attrib_clear(&s.attrib);
! 1677: s.name = s.long_name = pw->pw_dir;
! 1678: send_names(id, 1, &s);
! 1679: out:
! 1680: free(username);
1.93 djm 1681: }
1682:
1683: static void
1.98 djm 1684: process_extended(u_int32_t id)
1.10 markus 1685: {
1686: char *request;
1.126 djm 1687: int r;
1.125 djm 1688: const struct sftp_handler *exthand;
1.10 markus 1689:
1.104 djm 1690: if ((r = sshbuf_get_cstring(iqueue, &request, NULL)) != 0)
1.120 djm 1691: fatal_fr(r, "parse");
1.125 djm 1692: if ((exthand = extended_handler_byname(request)) == NULL) {
1.98 djm 1693: error("Unknown extended request \"%.100s\"", request);
1.78 djm 1694: send_status(id, SSH2_FX_OP_UNSUPPORTED); /* MUST */
1.125 djm 1695: } else {
1696: if (!request_permitted(exthand))
1697: send_status(id, SSH2_FX_PERMISSION_DENIED);
1698: else
1699: exthand->handler(id);
1.98 djm 1700: }
1.97 djm 1701: free(request);
1.10 markus 1702: }
1.1 markus 1703:
1704: /* stolen from ssh-agent */
1705:
1.28 itojun 1706: static void
1.1 markus 1707: process(void)
1708: {
1.104 djm 1709: u_int msg_len;
1710: u_int buf_len;
1711: u_int consumed;
1712: u_char type;
1713: const u_char *cp;
1714: int i, r;
1.98 djm 1715: u_int32_t id;
1.1 markus 1716:
1.104 djm 1717: buf_len = sshbuf_len(iqueue);
1.34 markus 1718: if (buf_len < 5)
1.1 markus 1719: return; /* Incomplete message. */
1.104 djm 1720: cp = sshbuf_ptr(iqueue);
1.57 djm 1721: msg_len = get_u32(cp);
1.50 djm 1722: if (msg_len > SFTP_MAX_MSG_LENGTH) {
1.58 djm 1723: error("bad message from %s local user %s",
1724: client_addr, pw->pw_name);
1.76 markus 1725: sftp_server_cleanup_exit(11);
1.1 markus 1726: }
1.34 markus 1727: if (buf_len < msg_len + 4)
1.1 markus 1728: return;
1.104 djm 1729: if ((r = sshbuf_consume(iqueue, 4)) != 0)
1.120 djm 1730: fatal_fr(r, "consume");
1.34 markus 1731: buf_len -= 4;
1.104 djm 1732: if ((r = sshbuf_get_u8(iqueue, &type)) != 0)
1.120 djm 1733: fatal_fr(r, "parse type");
1.98 djm 1734:
1.1 markus 1735: switch (type) {
1.10 markus 1736: case SSH2_FXP_INIT:
1.1 markus 1737: process_init();
1.98 djm 1738: init_done = 1;
1.1 markus 1739: break;
1.10 markus 1740: case SSH2_FXP_EXTENDED:
1.98 djm 1741: if (!init_done)
1742: fatal("Received extended request before init");
1.104 djm 1743: if ((r = sshbuf_get_u32(iqueue, &id)) != 0)
1.120 djm 1744: fatal_fr(r, "parse extended ID");
1.98 djm 1745: process_extended(id);
1.10 markus 1746: break;
1.1 markus 1747: default:
1.98 djm 1748: if (!init_done)
1749: fatal("Received %u request before init", type);
1.104 djm 1750: if ((r = sshbuf_get_u32(iqueue, &id)) != 0)
1.120 djm 1751: fatal_fr(r, "parse ID");
1.98 djm 1752: for (i = 0; handlers[i].handler != NULL; i++) {
1753: if (type == handlers[i].type) {
1754: if (!request_permitted(&handlers[i])) {
1755: send_status(id,
1756: SSH2_FX_PERMISSION_DENIED);
1757: } else {
1758: handlers[i].handler(id);
1759: }
1760: break;
1761: }
1762: }
1763: if (handlers[i].handler == NULL)
1764: error("Unknown message %u", type);
1.1 markus 1765: }
1.34 markus 1766: /* discard the remaining bytes from the current packet */
1.104 djm 1767: if (buf_len < sshbuf_len(iqueue)) {
1.76 markus 1768: error("iqueue grew unexpectedly");
1769: sftp_server_cleanup_exit(255);
1770: }
1.104 djm 1771: consumed = buf_len - sshbuf_len(iqueue);
1.76 markus 1772: if (msg_len < consumed) {
1.98 djm 1773: error("msg_len %u < consumed %u", msg_len, consumed);
1.76 markus 1774: sftp_server_cleanup_exit(255);
1775: }
1.104 djm 1776: if (msg_len > consumed &&
1777: (r = sshbuf_consume(iqueue, msg_len - consumed)) != 0)
1.120 djm 1778: fatal_fr(r, "consume");
1.1 markus 1779: }
1780:
1.58 djm 1781: /* Cleanup handler that logs active handles upon normal exit */
1782: void
1.76 markus 1783: sftp_server_cleanup_exit(int i)
1.58 djm 1784: {
1785: if (pw != NULL && client_addr != NULL) {
1786: handle_log_exit();
1787: logit("session closed for local user %s from [%s]",
1788: pw->pw_name, client_addr);
1789: }
1790: _exit(i);
1791: }
1792:
1793: static void
1.76 markus 1794: sftp_server_usage(void)
1.58 djm 1795: {
1796: extern char *__progname;
1797:
1798: fprintf(stderr,
1.96 jmc 1799: "usage: %s [-ehR] [-d start_directory] [-f log_facility] "
1.118 djm 1800: "[-l log_level]\n\t[-P denied_requests] "
1801: "[-p allowed_requests] [-u umask]\n"
1.100 jmc 1802: " %s -Q protocol_feature\n",
1803: __progname, __progname);
1.58 djm 1804: exit(1);
1805: }
1806:
1.1 markus 1807: int
1.77 djm 1808: sftp_server_main(int argc, char **argv, struct passwd *user_pw)
1.1 markus 1809: {
1.132 deraadt 1810: int i, r, in, out, ch, skipargs = 0, log_stderr = 0;
1811: ssize_t len, olen;
1.58 djm 1812: SyslogFacility log_facility = SYSLOG_FACILITY_AUTH;
1.112 djm 1813: char *cp, *homedir = NULL, uidstr[32], buf[4*4096];
1.92 djm 1814: long mask;
1.58 djm 1815:
1816: extern char *optarg;
1817: extern char *__progname;
1.49 djm 1818:
1.58 djm 1819: log_init(__progname, log_level, log_facility, log_stderr);
1820:
1.95 djm 1821: pw = pwcopy(user_pw);
1822:
1.98 djm 1823: while (!skipargs && (ch = getopt(argc, argv,
1824: "d:f:l:P:p:Q:u:cehR")) != -1) {
1.58 djm 1825: switch (ch) {
1.98 djm 1826: case 'Q':
1827: if (strcasecmp(optarg, "requests") != 0) {
1828: fprintf(stderr, "Invalid query type\n");
1829: exit(1);
1830: }
1831: for (i = 0; handlers[i].handler != NULL; i++)
1832: printf("%s\n", handlers[i].name);
1833: for (i = 0; extended_handlers[i].handler != NULL; i++)
1834: printf("%s\n", extended_handlers[i].name);
1835: exit(0);
1836: break;
1.90 djm 1837: case 'R':
1838: readonly = 1;
1839: break;
1.58 djm 1840: case 'c':
1841: /*
1842: * Ignore all arguments if we are invoked as a
1.70 deraadt 1843: * shell using "sftp-server -c command"
1.58 djm 1844: */
1845: skipargs = 1;
1846: break;
1847: case 'e':
1848: log_stderr = 1;
1849: break;
1850: case 'l':
1851: log_level = log_level_number(optarg);
1852: if (log_level == SYSLOG_LEVEL_NOT_SET)
1853: error("Invalid log level \"%s\"", optarg);
1854: break;
1855: case 'f':
1856: log_facility = log_facility_number(optarg);
1.74 djm 1857: if (log_facility == SYSLOG_FACILITY_NOT_SET)
1.58 djm 1858: error("Invalid log facility \"%s\"", optarg);
1.86 djm 1859: break;
1.95 djm 1860: case 'd':
1861: cp = tilde_expand_filename(optarg, user_pw->pw_uid);
1.112 djm 1862: snprintf(uidstr, sizeof(uidstr), "%llu",
1863: (unsigned long long)pw->pw_uid);
1.95 djm 1864: homedir = percent_expand(cp, "d", user_pw->pw_dir,
1.112 djm 1865: "u", user_pw->pw_name, "U", uidstr, (char *)NULL);
1.95 djm 1866: free(cp);
1.98 djm 1867: break;
1868: case 'p':
1.118 djm 1869: if (request_allowlist != NULL)
1.98 djm 1870: fatal("Permitted requests already set");
1.118 djm 1871: request_allowlist = xstrdup(optarg);
1.98 djm 1872: break;
1873: case 'P':
1.118 djm 1874: if (request_denylist != NULL)
1.98 djm 1875: fatal("Refused requests already set");
1.118 djm 1876: request_denylist = xstrdup(optarg);
1.95 djm 1877: break;
1.86 djm 1878: case 'u':
1.92 djm 1879: errno = 0;
1880: mask = strtol(optarg, &cp, 8);
1881: if (mask < 0 || mask > 0777 || *cp != '\0' ||
1882: cp == optarg || (mask == 0 && errno != 0))
1883: fatal("Invalid umask \"%s\"", optarg);
1884: (void)umask((mode_t)mask);
1.58 djm 1885: break;
1886: case 'h':
1887: default:
1.76 markus 1888: sftp_server_usage();
1.58 djm 1889: }
1890: }
1891:
1892: log_init(__progname, log_level, log_facility, log_stderr);
1893:
1894: if ((cp = getenv("SSH_CONNECTION")) != NULL) {
1895: client_addr = xstrdup(cp);
1.76 markus 1896: if ((cp = strchr(client_addr, ' ')) == NULL) {
1897: error("Malformed SSH_CONNECTION variable: \"%s\"",
1.58 djm 1898: getenv("SSH_CONNECTION"));
1.76 markus 1899: sftp_server_cleanup_exit(255);
1900: }
1.58 djm 1901: *cp = '\0';
1902: } else
1903: client_addr = xstrdup("UNKNOWN");
1904:
1905: logit("session opened for local user %s from [%s]",
1906: pw->pw_name, client_addr);
1.10 markus 1907:
1.89 djm 1908: in = STDIN_FILENO;
1909: out = STDOUT_FILENO;
1.1 markus 1910:
1.104 djm 1911: if ((iqueue = sshbuf_new()) == NULL)
1.120 djm 1912: fatal_f("sshbuf_new failed");
1.104 djm 1913: if ((oqueue = sshbuf_new()) == NULL)
1.120 djm 1914: fatal_f("sshbuf_new failed");
1.1 markus 1915:
1.95 djm 1916: if (homedir != NULL) {
1917: if (chdir(homedir) != 0) {
1918: error("chdir to \"%s\" failed: %s", homedir,
1919: strerror(errno));
1920: }
1921: }
1.21 millert 1922:
1.1 markus 1923: for (;;) {
1.132 deraadt 1924: struct pollfd pfd[2];
1925:
1926: memset(pfd, 0, sizeof pfd);
1927: pfd[0].fd = pfd[1].fd = -1;
1.1 markus 1928:
1.73 djm 1929: /*
1930: * Ensure that we can read a full buffer and handle
1931: * the worst-case length packet it can generate,
1932: * otherwise apply backpressure by stopping reads.
1933: */
1.104 djm 1934: if ((r = sshbuf_check_reserve(iqueue, sizeof(buf))) == 0 &&
1935: (r = sshbuf_check_reserve(oqueue,
1.133 deraadt 1936: SFTP_MAX_MSG_LENGTH)) == 0) {
1.132 deraadt 1937: pfd[0].fd = in;
1.133 deraadt 1938: pfd[0].events = POLLIN;
1939: }
1.104 djm 1940: else if (r != SSH_ERR_NO_BUFFER_SPACE)
1.120 djm 1941: fatal_fr(r, "reserve");
1.73 djm 1942:
1.104 djm 1943: olen = sshbuf_len(oqueue);
1.133 deraadt 1944: if (olen > 0) {
1.132 deraadt 1945: pfd[1].fd = out;
1.133 deraadt 1946: pfd[1].events = POLLOUT;
1947: }
1.1 markus 1948:
1.132 deraadt 1949: if (poll(pfd, 2, -1) == -1) {
1.1 markus 1950: if (errno == EINTR)
1951: continue;
1.132 deraadt 1952: error("poll: %s", strerror(errno));
1.76 markus 1953: sftp_server_cleanup_exit(2);
1.1 markus 1954: }
1955:
1956: /* copy stdin to iqueue */
1.134 djm 1957: if (pfd[0].revents & (POLLIN|POLLHUP)) {
1.1 markus 1958: len = read(in, buf, sizeof buf);
1959: if (len == 0) {
1960: debug("read eof");
1.76 markus 1961: sftp_server_cleanup_exit(0);
1.116 deraadt 1962: } else if (len == -1) {
1.134 djm 1963: if (errno != EAGAIN && errno != EINTR) {
1964: error("read: %s", strerror(errno));
1965: sftp_server_cleanup_exit(1);
1966: }
1.120 djm 1967: } else if ((r = sshbuf_put(iqueue, buf, len)) != 0)
1968: fatal_fr(r, "sshbuf_put");
1.1 markus 1969: }
1970: /* send oqueue to stdout */
1.134 djm 1971: if (pfd[1].revents & (POLLOUT|POLLHUP)) {
1.104 djm 1972: len = write(out, sshbuf_ptr(oqueue), olen);
1.134 djm 1973: if (len == 0 || (len == -1 && errno == EPIPE)) {
1974: debug("write eof");
1975: sftp_server_cleanup_exit(0);
1976: } else if (len == -1) {
1.76 markus 1977: sftp_server_cleanup_exit(1);
1.134 djm 1978: if (errno != EAGAIN && errno != EINTR) {
1979: error("write: %s", strerror(errno));
1980: sftp_server_cleanup_exit(1);
1981: }
1.120 djm 1982: } else if ((r = sshbuf_consume(oqueue, len)) != 0)
1983: fatal_fr(r, "consume");
1.1 markus 1984: }
1.73 djm 1985:
1986: /*
1987: * Process requests from client if we can fit the results
1988: * into the output buffer, otherwise stop processing input
1989: * and let the output queue drain.
1990: */
1.104 djm 1991: r = sshbuf_check_reserve(oqueue, SFTP_MAX_MSG_LENGTH);
1992: if (r == 0)
1.73 djm 1993: process();
1.104 djm 1994: else if (r != SSH_ERR_NO_BUFFER_SPACE)
1.120 djm 1995: fatal_fr(r, "reserve");
1.1 markus 1996: }
1997: }
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