Annotation of src/usr.bin/ssh/sftp-server.c, Revision 1.136
1.136 ! djm 1: /* $OpenBSD: sftp-server.c,v 1.135 2022/01/01 01:55:30 jsg 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:
1.70 deraadt 37: #include "xmalloc.h"
1.104 djm 38: #include "sshbuf.h"
39: #include "ssherr.h"
1.14 markus 40: #include "log.h"
1.49 djm 41: #include "misc.h"
1.98 djm 42: #include "match.h"
1.58 djm 43: #include "uidswap.h"
1.1 markus 44:
1.10 markus 45: #include "sftp.h"
1.15 djm 46: #include "sftp-common.h"
1.1 markus 47:
1.117 djm 48: char *sftp_realpath(const char *, char *); /* sftp-realpath.c */
49:
1.122 djm 50: /* Maximum data read that we are willing to accept */
1.124 djm 51: #define SFTP_MAX_READ_LENGTH (SFTP_MAX_MSG_LENGTH - 1024)
1.122 djm 52:
1.58 djm 53: /* Our verbosity */
1.98 djm 54: static LogLevel log_level = SYSLOG_LEVEL_ERROR;
1.58 djm 55:
56: /* Our client */
1.98 djm 57: static struct passwd *pw = NULL;
58: static char *client_addr = NULL;
1.1 markus 59:
60: /* input and output queue */
1.104 djm 61: struct sshbuf *iqueue;
62: struct sshbuf *oqueue;
1.1 markus 63:
1.23 djm 64: /* Version of client */
1.98 djm 65: static u_int version;
66:
67: /* SSH2_FXP_INIT received */
68: static int init_done;
1.23 djm 69:
1.90 djm 70: /* Disable writes */
1.98 djm 71: static int readonly;
72:
73: /* Requests that are allowed/denied */
1.118 djm 74: static char *request_allowlist, *request_denylist;
1.90 djm 75:
1.43 miod 76: /* portable attributes, etc. */
1.1 markus 77: typedef struct Stat Stat;
78:
1.15 djm 79: struct Stat {
1.1 markus 80: char *name;
81: char *long_name;
82: Attrib attrib;
83: };
84:
1.98 djm 85: /* Packet handlers */
86: static void process_open(u_int32_t id);
87: static void process_close(u_int32_t id);
88: static void process_read(u_int32_t id);
89: static void process_write(u_int32_t id);
90: static void process_stat(u_int32_t id);
91: static void process_lstat(u_int32_t id);
92: static void process_fstat(u_int32_t id);
93: static void process_setstat(u_int32_t id);
94: static void process_fsetstat(u_int32_t id);
95: static void process_opendir(u_int32_t id);
96: static void process_readdir(u_int32_t id);
97: static void process_remove(u_int32_t id);
98: static void process_mkdir(u_int32_t id);
99: static void process_rmdir(u_int32_t id);
100: static void process_realpath(u_int32_t id);
101: static void process_rename(u_int32_t id);
102: static void process_readlink(u_int32_t id);
103: static void process_symlink(u_int32_t id);
104: static void process_extended_posix_rename(u_int32_t id);
105: static void process_extended_statvfs(u_int32_t id);
106: static void process_extended_fstatvfs(u_int32_t id);
107: static void process_extended_hardlink(u_int32_t id);
1.102 djm 108: static void process_extended_fsync(u_int32_t id);
1.114 djm 109: static void process_extended_lsetstat(u_int32_t id);
1.122 djm 110: static void process_extended_limits(u_int32_t id);
1.129 djm 111: static void process_extended_expand(u_int32_t id);
1.98 djm 112: static void process_extended(u_int32_t id);
113:
114: struct sftp_handler {
115: const char *name; /* user-visible name for fine-grained perms */
116: const char *ext_name; /* extended request name */
117: u_int type; /* packet type, for non extended packets */
118: void (*handler)(u_int32_t);
119: int does_write; /* if nonzero, banned for readonly mode */
120: };
121:
1.113 djm 122: static const struct sftp_handler handlers[] = {
1.98 djm 123: /* NB. SSH2_FXP_OPEN does the readonly check in the handler itself */
124: { "open", NULL, SSH2_FXP_OPEN, process_open, 0 },
125: { "close", NULL, SSH2_FXP_CLOSE, process_close, 0 },
126: { "read", NULL, SSH2_FXP_READ, process_read, 0 },
127: { "write", NULL, SSH2_FXP_WRITE, process_write, 1 },
128: { "lstat", NULL, SSH2_FXP_LSTAT, process_lstat, 0 },
129: { "fstat", NULL, SSH2_FXP_FSTAT, process_fstat, 0 },
130: { "setstat", NULL, SSH2_FXP_SETSTAT, process_setstat, 1 },
131: { "fsetstat", NULL, SSH2_FXP_FSETSTAT, process_fsetstat, 1 },
132: { "opendir", NULL, SSH2_FXP_OPENDIR, process_opendir, 0 },
133: { "readdir", NULL, SSH2_FXP_READDIR, process_readdir, 0 },
134: { "remove", NULL, SSH2_FXP_REMOVE, process_remove, 1 },
135: { "mkdir", NULL, SSH2_FXP_MKDIR, process_mkdir, 1 },
136: { "rmdir", NULL, SSH2_FXP_RMDIR, process_rmdir, 1 },
137: { "realpath", NULL, SSH2_FXP_REALPATH, process_realpath, 0 },
138: { "stat", NULL, SSH2_FXP_STAT, process_stat, 0 },
139: { "rename", NULL, SSH2_FXP_RENAME, process_rename, 1 },
140: { "readlink", NULL, SSH2_FXP_READLINK, process_readlink, 0 },
141: { "symlink", NULL, SSH2_FXP_SYMLINK, process_symlink, 1 },
142: { NULL, NULL, 0, NULL, 0 }
143: };
144:
145: /* SSH2_FXP_EXTENDED submessages */
1.113 djm 146: static const struct sftp_handler extended_handlers[] = {
1.98 djm 147: { "posix-rename", "posix-rename@openssh.com", 0,
1.127 djm 148: process_extended_posix_rename, 1 },
1.98 djm 149: { "statvfs", "statvfs@openssh.com", 0, process_extended_statvfs, 0 },
150: { "fstatvfs", "fstatvfs@openssh.com", 0, process_extended_fstatvfs, 0 },
151: { "hardlink", "hardlink@openssh.com", 0, process_extended_hardlink, 1 },
1.102 djm 152: { "fsync", "fsync@openssh.com", 0, process_extended_fsync, 1 },
1.114 djm 153: { "lsetstat", "lsetstat@openssh.com", 0, process_extended_lsetstat, 1 },
1.128 djm 154: { "limits", "limits@openssh.com", 0, process_extended_limits, 0 },
1.129 djm 155: { "expand-path", "expand-path@openssh.com", 0,
156: process_extended_expand, 0 },
1.98 djm 157: { NULL, NULL, 0, NULL, 0 }
158: };
159:
1.125 djm 160: static const struct sftp_handler *
161: extended_handler_byname(const char *name)
162: {
163: int i;
164:
165: for (i = 0; extended_handlers[i].handler != NULL; i++) {
166: if (strcmp(name, extended_handlers[i].ext_name) == 0)
167: return &extended_handlers[i];
168: }
169: return NULL;
170: }
171:
1.98 djm 172: static int
1.113 djm 173: request_permitted(const struct sftp_handler *h)
1.98 djm 174: {
175: char *result;
176:
177: if (readonly && h->does_write) {
178: verbose("Refusing %s request in read-only mode", h->name);
179: return 0;
180: }
1.118 djm 181: if (request_denylist != NULL &&
182: ((result = match_list(h->name, request_denylist, NULL))) != NULL) {
1.98 djm 183: free(result);
1.118 djm 184: verbose("Refusing denylisted %s request", h->name);
1.98 djm 185: return 0;
186: }
1.118 djm 187: if (request_allowlist != NULL &&
188: ((result = match_list(h->name, request_allowlist, NULL))) != NULL) {
1.98 djm 189: free(result);
1.118 djm 190: debug2("Permitting allowlisted %s request", h->name);
1.98 djm 191: return 1;
192: }
1.118 djm 193: if (request_allowlist != NULL) {
194: verbose("Refusing non-allowlisted %s request", h->name);
1.98 djm 195: return 0;
196: }
197: return 1;
198: }
199:
1.28 itojun 200: static int
1.2 markus 201: errno_to_portable(int unixerrno)
1.1 markus 202: {
203: int ret = 0;
1.22 deraadt 204:
1.2 markus 205: switch (unixerrno) {
1.1 markus 206: case 0:
1.10 markus 207: ret = SSH2_FX_OK;
1.1 markus 208: break;
209: case ENOENT:
210: case ENOTDIR:
211: case EBADF:
212: case ELOOP:
1.10 markus 213: ret = SSH2_FX_NO_SUCH_FILE;
1.1 markus 214: break;
215: case EPERM:
216: case EACCES:
217: case EFAULT:
1.10 markus 218: ret = SSH2_FX_PERMISSION_DENIED;
1.1 markus 219: break;
220: case ENAMETOOLONG:
221: case EINVAL:
1.10 markus 222: ret = SSH2_FX_BAD_MESSAGE;
1.82 dtucker 223: break;
224: case ENOSYS:
225: ret = SSH2_FX_OP_UNSUPPORTED;
1.1 markus 226: break;
227: default:
1.10 markus 228: ret = SSH2_FX_FAILURE;
1.1 markus 229: break;
230: }
231: return ret;
232: }
233:
1.28 itojun 234: static int
1.1 markus 235: flags_from_portable(int pflags)
236: {
237: int flags = 0;
1.22 deraadt 238:
1.20 deraadt 239: if ((pflags & SSH2_FXF_READ) &&
240: (pflags & SSH2_FXF_WRITE)) {
1.1 markus 241: flags = O_RDWR;
1.10 markus 242: } else if (pflags & SSH2_FXF_READ) {
1.1 markus 243: flags = O_RDONLY;
1.10 markus 244: } else if (pflags & SSH2_FXF_WRITE) {
1.1 markus 245: flags = O_WRONLY;
246: }
1.101 djm 247: if (pflags & SSH2_FXF_APPEND)
248: flags |= O_APPEND;
1.10 markus 249: if (pflags & SSH2_FXF_CREAT)
1.1 markus 250: flags |= O_CREAT;
1.10 markus 251: if (pflags & SSH2_FXF_TRUNC)
1.1 markus 252: flags |= O_TRUNC;
1.10 markus 253: if (pflags & SSH2_FXF_EXCL)
1.1 markus 254: flags |= O_EXCL;
255: return flags;
256: }
257:
1.58 djm 258: static const char *
259: string_from_portable(int pflags)
260: {
261: static char ret[128];
262:
263: *ret = '\0';
264:
265: #define PAPPEND(str) { \
266: if (*ret != '\0') \
267: strlcat(ret, ",", sizeof(ret)); \
1.70 deraadt 268: strlcat(ret, str, sizeof(ret)); \
1.58 djm 269: }
270:
271: if (pflags & SSH2_FXF_READ)
272: PAPPEND("READ")
273: if (pflags & SSH2_FXF_WRITE)
274: PAPPEND("WRITE")
1.101 djm 275: if (pflags & SSH2_FXF_APPEND)
276: PAPPEND("APPEND")
1.58 djm 277: if (pflags & SSH2_FXF_CREAT)
278: PAPPEND("CREATE")
279: if (pflags & SSH2_FXF_TRUNC)
280: PAPPEND("TRUNCATE")
281: if (pflags & SSH2_FXF_EXCL)
282: PAPPEND("EXCL")
283:
284: return ret;
285: }
286:
1.1 markus 287: /* handle handles */
288:
289: typedef struct Handle Handle;
290: struct Handle {
291: int use;
292: DIR *dirp;
293: int fd;
1.101 djm 294: int flags;
1.1 markus 295: char *name;
1.58 djm 296: u_int64_t bytes_read, bytes_write;
1.75 djm 297: int next_unused;
1.1 markus 298: };
1.22 deraadt 299:
1.1 markus 300: enum {
301: HANDLE_UNUSED,
302: HANDLE_DIR,
303: HANDLE_FILE
304: };
1.22 deraadt 305:
1.113 djm 306: static Handle *handles = NULL;
307: static u_int num_handles = 0;
308: static int first_unused_handle = -1;
1.75 djm 309:
310: static void handle_unused(int i)
311: {
312: handles[i].use = HANDLE_UNUSED;
313: handles[i].next_unused = first_unused_handle;
314: first_unused_handle = i;
1.1 markus 315: }
316:
1.28 itojun 317: static int
1.101 djm 318: handle_new(int use, const char *name, int fd, int flags, DIR *dirp)
1.1 markus 319: {
1.75 djm 320: int i;
321:
322: if (first_unused_handle == -1) {
323: if (num_handles + 1 <= num_handles)
324: return -1;
325: num_handles++;
1.106 deraadt 326: handles = xreallocarray(handles, num_handles, sizeof(Handle));
1.75 djm 327: handle_unused(num_handles - 1);
328: }
329:
330: i = first_unused_handle;
331: first_unused_handle = handles[i].next_unused;
332:
333: handles[i].use = use;
334: handles[i].dirp = dirp;
335: handles[i].fd = fd;
1.101 djm 336: handles[i].flags = flags;
1.75 djm 337: handles[i].name = xstrdup(name);
338: handles[i].bytes_read = handles[i].bytes_write = 0;
1.22 deraadt 339:
1.75 djm 340: return i;
1.1 markus 341: }
342:
1.28 itojun 343: static int
1.1 markus 344: handle_is_ok(int i, int type)
345: {
1.75 djm 346: return i >= 0 && (u_int)i < num_handles && handles[i].use == type;
1.1 markus 347: }
348:
1.28 itojun 349: static int
1.104 djm 350: handle_to_string(int handle, u_char **stringp, int *hlenp)
1.1 markus 351: {
352: if (stringp == NULL || hlenp == NULL)
353: return -1;
1.13 markus 354: *stringp = xmalloc(sizeof(int32_t));
1.57 djm 355: put_u32(*stringp, handle);
1.13 markus 356: *hlenp = sizeof(int32_t);
1.1 markus 357: return 0;
358: }
359:
1.28 itojun 360: static int
1.104 djm 361: handle_from_string(const u_char *handle, u_int hlen)
1.1 markus 362: {
1.13 markus 363: int val;
1.22 deraadt 364:
1.13 markus 365: if (hlen != sizeof(int32_t))
1.1 markus 366: return -1;
1.57 djm 367: val = get_u32(handle);
1.1 markus 368: if (handle_is_ok(val, HANDLE_FILE) ||
369: handle_is_ok(val, HANDLE_DIR))
370: return val;
371: return -1;
372: }
373:
1.28 itojun 374: static char *
1.1 markus 375: handle_to_name(int handle)
376: {
377: if (handle_is_ok(handle, HANDLE_DIR)||
378: handle_is_ok(handle, HANDLE_FILE))
379: return handles[handle].name;
380: return NULL;
381: }
382:
1.28 itojun 383: static DIR *
1.1 markus 384: handle_to_dir(int handle)
385: {
386: if (handle_is_ok(handle, HANDLE_DIR))
387: return handles[handle].dirp;
388: return NULL;
389: }
390:
1.28 itojun 391: static int
1.1 markus 392: handle_to_fd(int handle)
393: {
1.17 stevesk 394: if (handle_is_ok(handle, HANDLE_FILE))
1.1 markus 395: return handles[handle].fd;
396: return -1;
397: }
398:
1.101 djm 399: static int
400: handle_to_flags(int handle)
401: {
402: if (handle_is_ok(handle, HANDLE_FILE))
403: return handles[handle].flags;
404: return 0;
405: }
406:
1.58 djm 407: static void
408: handle_update_read(int handle, ssize_t bytes)
409: {
410: if (handle_is_ok(handle, HANDLE_FILE) && bytes > 0)
411: handles[handle].bytes_read += bytes;
412: }
413:
414: static void
415: handle_update_write(int handle, ssize_t bytes)
416: {
417: if (handle_is_ok(handle, HANDLE_FILE) && bytes > 0)
418: handles[handle].bytes_write += bytes;
419: }
420:
421: static u_int64_t
422: handle_bytes_read(int handle)
423: {
424: if (handle_is_ok(handle, HANDLE_FILE))
425: return (handles[handle].bytes_read);
426: return 0;
427: }
428:
429: static u_int64_t
430: handle_bytes_write(int handle)
431: {
432: if (handle_is_ok(handle, HANDLE_FILE))
433: return (handles[handle].bytes_write);
434: return 0;
435: }
436:
1.28 itojun 437: static int
1.1 markus 438: handle_close(int handle)
439: {
440: int ret = -1;
1.22 deraadt 441:
1.1 markus 442: if (handle_is_ok(handle, HANDLE_FILE)) {
443: ret = close(handles[handle].fd);
1.97 djm 444: free(handles[handle].name);
1.75 djm 445: handle_unused(handle);
1.1 markus 446: } else if (handle_is_ok(handle, HANDLE_DIR)) {
447: ret = closedir(handles[handle].dirp);
1.97 djm 448: free(handles[handle].name);
1.75 djm 449: handle_unused(handle);
1.1 markus 450: } else {
451: errno = ENOENT;
452: }
453: return ret;
454: }
455:
1.58 djm 456: static void
457: handle_log_close(int handle, char *emsg)
458: {
459: if (handle_is_ok(handle, HANDLE_FILE)) {
460: logit("%s%sclose \"%s\" bytes read %llu written %llu",
461: emsg == NULL ? "" : emsg, emsg == NULL ? "" : " ",
462: handle_to_name(handle),
1.72 stevesk 463: (unsigned long long)handle_bytes_read(handle),
464: (unsigned long long)handle_bytes_write(handle));
1.58 djm 465: } else {
466: logit("%s%sclosedir \"%s\"",
467: emsg == NULL ? "" : emsg, emsg == NULL ? "" : " ",
468: handle_to_name(handle));
469: }
470: }
471:
472: static void
473: handle_log_exit(void)
474: {
475: u_int i;
476:
1.75 djm 477: for (i = 0; i < num_handles; i++)
1.58 djm 478: if (handles[i].use != HANDLE_UNUSED)
479: handle_log_close(i, "forced");
480: }
481:
1.28 itojun 482: static int
1.104 djm 483: get_handle(struct sshbuf *queue, int *hp)
1.1 markus 484: {
1.104 djm 485: u_char *handle;
486: int r;
487: size_t hlen;
488:
489: *hp = -1;
490: if ((r = sshbuf_get_string(queue, &handle, &hlen)) != 0)
491: return r;
1.10 markus 492: if (hlen < 256)
1.104 djm 493: *hp = handle_from_string(handle, hlen);
1.97 djm 494: free(handle);
1.104 djm 495: return 0;
1.1 markus 496: }
497:
498: /* send replies */
499:
1.28 itojun 500: static void
1.104 djm 501: send_msg(struct sshbuf *m)
1.1 markus 502: {
1.104 djm 503: int r;
1.22 deraadt 504:
1.104 djm 505: if ((r = sshbuf_put_stringb(oqueue, m)) != 0)
1.120 djm 506: fatal_fr(r, "enqueue");
1.104 djm 507: sshbuf_reset(m);
1.1 markus 508: }
509:
1.58 djm 510: static const char *
511: status_to_message(u_int32_t status)
1.1 markus 512: {
1.23 djm 513: const char *status_messages[] = {
514: "Success", /* SSH_FX_OK */
515: "End of file", /* SSH_FX_EOF */
516: "No such file", /* SSH_FX_NO_SUCH_FILE */
517: "Permission denied", /* SSH_FX_PERMISSION_DENIED */
518: "Failure", /* SSH_FX_FAILURE */
519: "Bad message", /* SSH_FX_BAD_MESSAGE */
520: "No connection", /* SSH_FX_NO_CONNECTION */
521: "Connection lost", /* SSH_FX_CONNECTION_LOST */
522: "Operation unsupported", /* SSH_FX_OP_UNSUPPORTED */
523: "Unknown error" /* Others */
524: };
1.110 deraadt 525: return (status_messages[MINIMUM(status,SSH2_FX_MAX)]);
1.58 djm 526: }
1.22 deraadt 527:
1.58 djm 528: static void
1.136 ! djm 529: send_status_errmsg(u_int32_t id, u_int32_t status, const char *errmsg)
1.58 djm 530: {
1.104 djm 531: struct sshbuf *msg;
532: int r;
1.58 djm 533:
534: debug3("request %u: sent status %u", id, status);
535: if (log_level > SYSLOG_LEVEL_VERBOSE ||
536: (status != SSH2_FX_OK && status != SSH2_FX_EOF))
537: logit("sent status %s", status_to_message(status));
1.104 djm 538: if ((msg = sshbuf_new()) == NULL)
1.120 djm 539: fatal_f("sshbuf_new failed");
1.104 djm 540: if ((r = sshbuf_put_u8(msg, SSH2_FXP_STATUS)) != 0 ||
541: (r = sshbuf_put_u32(msg, id)) != 0 ||
542: (r = sshbuf_put_u32(msg, status)) != 0)
1.120 djm 543: fatal_fr(r, "compose");
1.23 djm 544: if (version >= 3) {
1.136 ! djm 545: if ((r = sshbuf_put_cstring(msg, errmsg == NULL ?
! 546: status_to_message(status) : errmsg)) != 0 ||
1.104 djm 547: (r = sshbuf_put_cstring(msg, "")) != 0)
1.120 djm 548: fatal_fr(r, "compose message");
1.23 djm 549: }
1.104 djm 550: send_msg(msg);
551: sshbuf_free(msg);
1.1 markus 552: }
1.136 ! djm 553:
! 554: static void
! 555: send_status(u_int32_t id, u_int32_t status)
! 556: {
! 557: return send_status_errmsg(id, status, NULL);
! 558: }
! 559:
1.28 itojun 560: static void
1.104 djm 561: send_data_or_handle(char type, u_int32_t id, const u_char *data, int dlen)
1.1 markus 562: {
1.104 djm 563: struct sshbuf *msg;
564: int r;
1.22 deraadt 565:
1.104 djm 566: if ((msg = sshbuf_new()) == NULL)
1.120 djm 567: fatal_f("sshbuf_new failed");
1.104 djm 568: if ((r = sshbuf_put_u8(msg, type)) != 0 ||
569: (r = sshbuf_put_u32(msg, id)) != 0 ||
570: (r = sshbuf_put_string(msg, data, dlen)) != 0)
1.120 djm 571: fatal_fr(r, "compose");
1.104 djm 572: send_msg(msg);
573: sshbuf_free(msg);
1.1 markus 574: }
575:
1.28 itojun 576: static void
1.104 djm 577: send_data(u_int32_t id, const u_char *data, int dlen)
1.1 markus 578: {
1.58 djm 579: debug("request %u: sent data len %d", id, dlen);
1.10 markus 580: send_data_or_handle(SSH2_FXP_DATA, id, data, dlen);
1.1 markus 581: }
582:
1.28 itojun 583: static void
1.1 markus 584: send_handle(u_int32_t id, int handle)
585: {
1.104 djm 586: u_char *string;
1.1 markus 587: int hlen;
1.22 deraadt 588:
1.1 markus 589: handle_to_string(handle, &string, &hlen);
1.58 djm 590: debug("request %u: sent handle handle %d", id, handle);
1.10 markus 591: send_data_or_handle(SSH2_FXP_HANDLE, id, string, hlen);
1.97 djm 592: free(string);
1.1 markus 593: }
594:
1.28 itojun 595: static void
1.44 jakob 596: send_names(u_int32_t id, int count, const Stat *stats)
1.1 markus 597: {
1.104 djm 598: struct sshbuf *msg;
599: int i, r;
1.22 deraadt 600:
1.104 djm 601: if ((msg = sshbuf_new()) == NULL)
1.120 djm 602: fatal_f("sshbuf_new failed");
1.104 djm 603: if ((r = sshbuf_put_u8(msg, SSH2_FXP_NAME)) != 0 ||
604: (r = sshbuf_put_u32(msg, id)) != 0 ||
605: (r = sshbuf_put_u32(msg, count)) != 0)
1.120 djm 606: fatal_fr(r, "compose");
1.58 djm 607: debug("request %u: sent names count %d", id, count);
1.1 markus 608: for (i = 0; i < count; i++) {
1.104 djm 609: if ((r = sshbuf_put_cstring(msg, stats[i].name)) != 0 ||
610: (r = sshbuf_put_cstring(msg, stats[i].long_name)) != 0 ||
611: (r = encode_attrib(msg, &stats[i].attrib)) != 0)
1.120 djm 612: fatal_fr(r, "compose filenames/attrib");
1.1 markus 613: }
1.104 djm 614: send_msg(msg);
615: sshbuf_free(msg);
1.1 markus 616: }
617:
1.28 itojun 618: static void
1.44 jakob 619: send_attrib(u_int32_t id, const Attrib *a)
1.1 markus 620: {
1.104 djm 621: struct sshbuf *msg;
622: int r;
1.22 deraadt 623:
1.58 djm 624: debug("request %u: sent attrib have 0x%x", id, a->flags);
1.104 djm 625: if ((msg = sshbuf_new()) == NULL)
1.120 djm 626: fatal_f("sshbuf_new failed");
1.104 djm 627: if ((r = sshbuf_put_u8(msg, SSH2_FXP_ATTRS)) != 0 ||
628: (r = sshbuf_put_u32(msg, id)) != 0 ||
629: (r = encode_attrib(msg, a)) != 0)
1.120 djm 630: fatal_fr(r, "compose");
1.104 djm 631: send_msg(msg);
632: sshbuf_free(msg);
1.1 markus 633: }
634:
1.79 djm 635: static void
636: send_statvfs(u_int32_t id, struct statvfs *st)
637: {
1.104 djm 638: struct sshbuf *msg;
1.79 djm 639: u_int64_t flag;
1.104 djm 640: int r;
1.79 djm 641:
642: flag = (st->f_flag & ST_RDONLY) ? SSH2_FXE_STATVFS_ST_RDONLY : 0;
643: flag |= (st->f_flag & ST_NOSUID) ? SSH2_FXE_STATVFS_ST_NOSUID : 0;
644:
1.104 djm 645: if ((msg = sshbuf_new()) == NULL)
1.120 djm 646: fatal_f("sshbuf_new failed");
1.104 djm 647: if ((r = sshbuf_put_u8(msg, SSH2_FXP_EXTENDED_REPLY)) != 0 ||
648: (r = sshbuf_put_u32(msg, id)) != 0 ||
649: (r = sshbuf_put_u64(msg, st->f_bsize)) != 0 ||
650: (r = sshbuf_put_u64(msg, st->f_frsize)) != 0 ||
651: (r = sshbuf_put_u64(msg, st->f_blocks)) != 0 ||
652: (r = sshbuf_put_u64(msg, st->f_bfree)) != 0 ||
653: (r = sshbuf_put_u64(msg, st->f_bavail)) != 0 ||
654: (r = sshbuf_put_u64(msg, st->f_files)) != 0 ||
655: (r = sshbuf_put_u64(msg, st->f_ffree)) != 0 ||
656: (r = sshbuf_put_u64(msg, st->f_favail)) != 0 ||
657: (r = sshbuf_put_u64(msg, st->f_fsid)) != 0 ||
658: (r = sshbuf_put_u64(msg, flag)) != 0 ||
659: (r = sshbuf_put_u64(msg, st->f_namemax)) != 0)
1.120 djm 660: fatal_fr(r, "compose");
1.104 djm 661: send_msg(msg);
662: sshbuf_free(msg);
1.79 djm 663: }
664:
1.125 djm 665: /*
666: * Prepare SSH2_FXP_VERSION extension advertisement for a single extension.
1.135 jsg 667: * The extension is checked for permission prior to advertisement.
1.125 djm 668: */
669: static int
670: compose_extension(struct sshbuf *msg, const char *name, const char *ver)
671: {
672: int r;
673: const struct sftp_handler *exthnd;
674:
675: if ((exthnd = extended_handler_byname(name)) == NULL)
676: fatal_f("internal error: no handler for %s", name);
677: if (!request_permitted(exthnd)) {
678: debug2_f("refusing to advertise disallowed extension %s", name);
679: return 0;
680: }
681: if ((r = sshbuf_put_cstring(msg, name)) != 0 ||
682: (r = sshbuf_put_cstring(msg, ver)) != 0)
683: fatal_fr(r, "compose %s", name);
684: return 0;
685: }
686:
1.1 markus 687: /* parse incoming */
688:
1.28 itojun 689: static void
1.1 markus 690: process_init(void)
691: {
1.104 djm 692: struct sshbuf *msg;
693: int r;
1.1 markus 694:
1.104 djm 695: if ((r = sshbuf_get_u32(iqueue, &version)) != 0)
1.120 djm 696: fatal_fr(r, "parse");
1.94 djm 697: verbose("received client version %u", version);
1.104 djm 698: if ((msg = sshbuf_new()) == NULL)
1.120 djm 699: fatal_f("sshbuf_new failed");
1.104 djm 700: if ((r = sshbuf_put_u8(msg, SSH2_FXP_VERSION)) != 0 ||
1.125 djm 701: (r = sshbuf_put_u32(msg, SSH2_FILEXFER_VERSION)) != 0)
1.120 djm 702: fatal_fr(r, "compose");
1.125 djm 703:
1.135 jsg 704: /* extension advertisements */
1.125 djm 705: compose_extension(msg, "posix-rename@openssh.com", "1");
706: compose_extension(msg, "statvfs@openssh.com", "2");
707: compose_extension(msg, "fstatvfs@openssh.com", "2");
708: compose_extension(msg, "hardlink@openssh.com", "1");
709: compose_extension(msg, "fsync@openssh.com", "1");
710: compose_extension(msg, "lsetstat@openssh.com", "1");
711: compose_extension(msg, "limits@openssh.com", "1");
1.129 djm 712: compose_extension(msg, "expand-path@openssh.com", "1");
1.125 djm 713:
1.104 djm 714: send_msg(msg);
715: sshbuf_free(msg);
1.1 markus 716: }
717:
1.28 itojun 718: static void
1.98 djm 719: process_open(u_int32_t id)
1.1 markus 720: {
1.98 djm 721: u_int32_t pflags;
1.104 djm 722: Attrib a;
1.1 markus 723: char *name;
1.104 djm 724: int r, handle, fd, flags, mode, status = SSH2_FX_FAILURE;
725:
726: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0 ||
727: (r = sshbuf_get_u32(iqueue, &pflags)) != 0 || /* portable flags */
728: (r = decode_attrib(iqueue, &a)) != 0)
1.120 djm 729: fatal_fr(r, "parse");
1.1 markus 730:
1.61 djm 731: debug3("request %u: open flags %d", id, pflags);
1.1 markus 732: flags = flags_from_portable(pflags);
1.104 djm 733: mode = (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ? a.perm : 0666;
1.58 djm 734: logit("open \"%s\" flags %s mode 0%o",
735: name, string_from_portable(pflags), mode);
1.90 djm 736: if (readonly &&
1.111 djm 737: ((flags & O_ACCMODE) != O_RDONLY ||
738: (flags & (O_CREAT|O_TRUNC)) != 0)) {
1.98 djm 739: verbose("Refusing open request in read-only mode");
1.104 djm 740: status = SSH2_FX_PERMISSION_DENIED;
1.98 djm 741: } else {
1.90 djm 742: fd = open(name, flags, mode);
1.116 deraadt 743: if (fd == -1) {
1.90 djm 744: status = errno_to_portable(errno);
1.1 markus 745: } else {
1.101 djm 746: handle = handle_new(HANDLE_FILE, name, fd, flags, NULL);
1.90 djm 747: if (handle < 0) {
748: close(fd);
749: } else {
750: send_handle(id, handle);
751: status = SSH2_FX_OK;
752: }
1.1 markus 753: }
754: }
1.10 markus 755: if (status != SSH2_FX_OK)
1.1 markus 756: send_status(id, status);
1.97 djm 757: free(name);
1.1 markus 758: }
759:
1.28 itojun 760: static void
1.98 djm 761: process_close(u_int32_t id)
1.1 markus 762: {
1.104 djm 763: int r, handle, ret, status = SSH2_FX_FAILURE;
764:
765: if ((r = get_handle(iqueue, &handle)) != 0)
1.120 djm 766: fatal_fr(r, "parse");
1.1 markus 767:
1.58 djm 768: debug3("request %u: close handle %u", id, handle);
769: handle_log_close(handle, NULL);
1.1 markus 770: ret = handle_close(handle);
1.10 markus 771: status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.1 markus 772: send_status(id, status);
773: }
774:
1.28 itojun 775: static void
1.98 djm 776: process_read(u_int32_t id)
1.1 markus 777: {
1.124 djm 778: static u_char *buf;
779: static size_t buflen;
1.98 djm 780: u_int32_t len;
1.104 djm 781: int r, handle, fd, ret, status = SSH2_FX_FAILURE;
1.1 markus 782: u_int64_t off;
783:
1.104 djm 784: if ((r = get_handle(iqueue, &handle)) != 0 ||
785: (r = sshbuf_get_u64(iqueue, &off)) != 0 ||
786: (r = sshbuf_get_u32(iqueue, &len)) != 0)
1.120 djm 787: fatal_fr(r, "parse");
1.1 markus 788:
1.124 djm 789: debug("request %u: read \"%s\" (handle %d) off %llu len %u",
1.58 djm 790: id, handle_to_name(handle), handle, (unsigned long long)off, len);
1.124 djm 791: if ((fd = handle_to_fd(handle)) == -1)
792: goto out;
793: if (len > SFTP_MAX_READ_LENGTH) {
794: debug2("read change len %u to %u", len, SFTP_MAX_READ_LENGTH);
795: len = SFTP_MAX_READ_LENGTH;
796: }
797: if (len > buflen) {
798: debug3_f("allocate %zu => %u", buflen, len);
799: if ((buf = realloc(NULL, len)) == NULL)
800: fatal_f("realloc failed");
801: buflen = len;
802: }
803: if (lseek(fd, off, SEEK_SET) == -1) {
804: status = errno_to_portable(errno);
805: error_f("seek \"%.100s\": %s", handle_to_name(handle),
806: strerror(errno));
807: goto out;
808: }
809: if (len == 0) {
810: /* weird, but not strictly disallowed */
811: ret = 0;
812: } else if ((ret = read(fd, buf, len)) == -1) {
813: status = errno_to_portable(errno);
814: error_f("read \"%.100s\": %s", handle_to_name(handle),
815: strerror(errno));
816: goto out;
817: } else if (ret == 0) {
818: status = SSH2_FX_EOF;
819: goto out;
820: }
821: send_data(id, buf, ret);
822: handle_update_read(handle, ret);
823: /* success */
824: status = SSH2_FX_OK;
825: out:
1.10 markus 826: if (status != SSH2_FX_OK)
1.1 markus 827: send_status(id, status);
828: }
829:
1.28 itojun 830: static void
1.98 djm 831: process_write(u_int32_t id)
1.1 markus 832: {
833: u_int64_t off;
1.104 djm 834: size_t len;
835: int r, handle, fd, ret, status;
836: u_char *data;
837:
838: if ((r = get_handle(iqueue, &handle)) != 0 ||
839: (r = sshbuf_get_u64(iqueue, &off)) != 0 ||
840: (r = sshbuf_get_string(iqueue, &data, &len)) != 0)
1.120 djm 841: fatal_fr(r, "parse");
1.1 markus 842:
1.104 djm 843: debug("request %u: write \"%s\" (handle %d) off %llu len %zu",
1.58 djm 844: id, handle_to_name(handle), handle, (unsigned long long)off, len);
1.1 markus 845: fd = handle_to_fd(handle);
1.104 djm 846:
1.90 djm 847: if (fd < 0)
848: status = SSH2_FX_FAILURE;
849: else {
1.101 djm 850: if (!(handle_to_flags(handle) & O_APPEND) &&
1.123 djm 851: lseek(fd, off, SEEK_SET) == -1) {
1.1 markus 852: status = errno_to_portable(errno);
1.123 djm 853: error_f("seek \"%.100s\": %s", handle_to_name(handle),
854: strerror(errno));
1.1 markus 855: } else {
856: /* XXX ATOMICIO ? */
857: ret = write(fd, data, len);
1.116 deraadt 858: if (ret == -1) {
1.1 markus 859: status = errno_to_portable(errno);
1.123 djm 860: error_f("write \"%.100s\": %s",
861: handle_to_name(handle), strerror(errno));
1.48 djm 862: } else if ((size_t)ret == len) {
1.10 markus 863: status = SSH2_FX_OK;
1.58 djm 864: handle_update_write(handle, ret);
1.1 markus 865: } else {
1.120 djm 866: debug2_f("nothing at all written");
1.90 djm 867: status = SSH2_FX_FAILURE;
1.1 markus 868: }
869: }
870: }
871: send_status(id, status);
1.97 djm 872: free(data);
1.1 markus 873: }
874:
1.28 itojun 875: static void
1.98 djm 876: process_do_stat(u_int32_t id, int do_lstat)
1.1 markus 877: {
1.13 markus 878: Attrib a;
1.1 markus 879: struct stat st;
880: char *name;
1.104 djm 881: int r, status = SSH2_FX_FAILURE;
882:
883: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0)
1.120 djm 884: fatal_fr(r, "parse");
1.1 markus 885:
1.58 djm 886: debug3("request %u: %sstat", id, do_lstat ? "l" : "");
887: verbose("%sstat name \"%s\"", do_lstat ? "l" : "", name);
1.104 djm 888: r = do_lstat ? lstat(name, &st) : stat(name, &st);
1.116 deraadt 889: if (r == -1) {
1.1 markus 890: status = errno_to_portable(errno);
891: } else {
1.13 markus 892: stat_to_attrib(&st, &a);
893: send_attrib(id, &a);
1.10 markus 894: status = SSH2_FX_OK;
1.1 markus 895: }
1.10 markus 896: if (status != SSH2_FX_OK)
1.1 markus 897: send_status(id, status);
1.97 djm 898: free(name);
1.1 markus 899: }
900:
1.28 itojun 901: static void
1.98 djm 902: process_stat(u_int32_t id)
1.1 markus 903: {
1.98 djm 904: process_do_stat(id, 0);
1.1 markus 905: }
906:
1.28 itojun 907: static void
1.98 djm 908: process_lstat(u_int32_t id)
1.1 markus 909: {
1.98 djm 910: process_do_stat(id, 1);
1.1 markus 911: }
912:
1.28 itojun 913: static void
1.98 djm 914: process_fstat(u_int32_t id)
1.1 markus 915: {
1.13 markus 916: Attrib a;
1.1 markus 917: struct stat st;
1.104 djm 918: int fd, r, handle, status = SSH2_FX_FAILURE;
1.1 markus 919:
1.104 djm 920: if ((r = get_handle(iqueue, &handle)) != 0)
1.120 djm 921: fatal_fr(r, "parse");
1.58 djm 922: debug("request %u: fstat \"%s\" (handle %u)",
923: id, handle_to_name(handle), handle);
1.1 markus 924: fd = handle_to_fd(handle);
1.71 stevesk 925: if (fd >= 0) {
1.104 djm 926: r = fstat(fd, &st);
1.116 deraadt 927: if (r == -1) {
1.1 markus 928: status = errno_to_portable(errno);
929: } else {
1.13 markus 930: stat_to_attrib(&st, &a);
931: send_attrib(id, &a);
1.10 markus 932: status = SSH2_FX_OK;
1.1 markus 933: }
934: }
1.10 markus 935: if (status != SSH2_FX_OK)
1.1 markus 936: send_status(id, status);
937: }
938:
1.28 itojun 939: static struct timeval *
1.44 jakob 940: attrib_to_tv(const Attrib *a)
1.1 markus 941: {
942: static struct timeval tv[2];
1.22 deraadt 943:
1.1 markus 944: tv[0].tv_sec = a->atime;
945: tv[0].tv_usec = 0;
946: tv[1].tv_sec = a->mtime;
947: tv[1].tv_usec = 0;
948: return tv;
949: }
950:
1.114 djm 951: static struct timespec *
952: attrib_to_ts(const Attrib *a)
953: {
954: static struct timespec ts[2];
955:
956: ts[0].tv_sec = a->atime;
957: ts[0].tv_nsec = 0;
958: ts[1].tv_sec = a->mtime;
959: ts[1].tv_nsec = 0;
960: return ts;
961: }
962:
1.28 itojun 963: static void
1.98 djm 964: process_setstat(u_int32_t id)
1.1 markus 965: {
1.104 djm 966: Attrib a;
1.1 markus 967: char *name;
1.104 djm 968: int r, status = SSH2_FX_OK;
969:
970: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0 ||
971: (r = decode_attrib(iqueue, &a)) != 0)
1.120 djm 972: fatal_fr(r, "parse");
1.1 markus 973:
1.58 djm 974: debug("request %u: setstat name \"%s\"", id, name);
1.104 djm 975: if (a.flags & SSH2_FILEXFER_ATTR_SIZE) {
1.72 stevesk 976: logit("set \"%s\" size %llu",
1.104 djm 977: name, (unsigned long long)a.size);
978: r = truncate(name, a.size);
979: if (r == -1)
1.33 markus 980: status = errno_to_portable(errno);
981: }
1.104 djm 982: if (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
983: logit("set \"%s\" mode %04o", name, a.perm);
984: r = chmod(name, a.perm & 07777);
985: if (r == -1)
1.1 markus 986: status = errno_to_portable(errno);
987: }
1.104 djm 988: if (a.flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
1.58 djm 989: char buf[64];
1.104 djm 990: time_t t = a.mtime;
1.58 djm 991:
992: strftime(buf, sizeof(buf), "%Y%m%d-%H:%M:%S",
993: localtime(&t));
994: logit("set \"%s\" modtime %s", name, buf);
1.104 djm 995: r = utimes(name, attrib_to_tv(&a));
996: if (r == -1)
1.1 markus 997: status = errno_to_portable(errno);
998: }
1.104 djm 999: if (a.flags & SSH2_FILEXFER_ATTR_UIDGID) {
1.58 djm 1000: logit("set \"%s\" owner %lu group %lu", name,
1.104 djm 1001: (u_long)a.uid, (u_long)a.gid);
1002: r = chown(name, a.uid, a.gid);
1003: if (r == -1)
1.18 stevesk 1004: status = errno_to_portable(errno);
1005: }
1.1 markus 1006: send_status(id, status);
1.97 djm 1007: free(name);
1.1 markus 1008: }
1009:
1.28 itojun 1010: static void
1.98 djm 1011: process_fsetstat(u_int32_t id)
1.1 markus 1012: {
1.104 djm 1013: Attrib a;
1014: int handle, fd, r;
1.10 markus 1015: int status = SSH2_FX_OK;
1.1 markus 1016:
1.104 djm 1017: if ((r = get_handle(iqueue, &handle)) != 0 ||
1018: (r = decode_attrib(iqueue, &a)) != 0)
1.120 djm 1019: fatal_fr(r, "parse");
1.104 djm 1020:
1.58 djm 1021: debug("request %u: fsetstat handle %d", id, handle);
1.1 markus 1022: fd = handle_to_fd(handle);
1.90 djm 1023: if (fd < 0)
1.10 markus 1024: status = SSH2_FX_FAILURE;
1.90 djm 1025: else {
1.58 djm 1026: char *name = handle_to_name(handle);
1027:
1.104 djm 1028: if (a.flags & SSH2_FILEXFER_ATTR_SIZE) {
1.72 stevesk 1029: logit("set \"%s\" size %llu",
1.104 djm 1030: name, (unsigned long long)a.size);
1031: r = ftruncate(fd, a.size);
1032: if (r == -1)
1.33 markus 1033: status = errno_to_portable(errno);
1034: }
1.104 djm 1035: if (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
1036: logit("set \"%s\" mode %04o", name, a.perm);
1037: r = fchmod(fd, a.perm & 07777);
1038: if (r == -1)
1.1 markus 1039: status = errno_to_portable(errno);
1040: }
1.104 djm 1041: if (a.flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
1.58 djm 1042: char buf[64];
1.104 djm 1043: time_t t = a.mtime;
1.58 djm 1044:
1045: strftime(buf, sizeof(buf), "%Y%m%d-%H:%M:%S",
1046: localtime(&t));
1047: logit("set \"%s\" modtime %s", name, buf);
1.104 djm 1048: r = futimes(fd, attrib_to_tv(&a));
1049: if (r == -1)
1.18 stevesk 1050: status = errno_to_portable(errno);
1051: }
1.104 djm 1052: if (a.flags & SSH2_FILEXFER_ATTR_UIDGID) {
1.58 djm 1053: logit("set \"%s\" owner %lu group %lu", name,
1.104 djm 1054: (u_long)a.uid, (u_long)a.gid);
1055: r = fchown(fd, a.uid, a.gid);
1056: if (r == -1)
1.1 markus 1057: status = errno_to_portable(errno);
1058: }
1059: }
1060: send_status(id, status);
1061: }
1062:
1.28 itojun 1063: static void
1.98 djm 1064: process_opendir(u_int32_t id)
1.1 markus 1065: {
1066: DIR *dirp = NULL;
1067: char *path;
1.104 djm 1068: int r, handle, status = SSH2_FX_FAILURE;
1069:
1070: if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
1.120 djm 1071: fatal_fr(r, "parse");
1.1 markus 1072:
1.58 djm 1073: debug3("request %u: opendir", id);
1074: logit("opendir \"%s\"", path);
1.17 stevesk 1075: dirp = opendir(path);
1.1 markus 1076: if (dirp == NULL) {
1077: status = errno_to_portable(errno);
1078: } else {
1.101 djm 1079: handle = handle_new(HANDLE_DIR, path, 0, 0, dirp);
1.1 markus 1080: if (handle < 0) {
1081: closedir(dirp);
1082: } else {
1083: send_handle(id, handle);
1.10 markus 1084: status = SSH2_FX_OK;
1.1 markus 1085: }
1.17 stevesk 1086:
1.1 markus 1087: }
1.10 markus 1088: if (status != SSH2_FX_OK)
1.1 markus 1089: send_status(id, status);
1.97 djm 1090: free(path);
1.1 markus 1091: }
1092:
1.28 itojun 1093: static void
1.98 djm 1094: process_readdir(u_int32_t id)
1.1 markus 1095: {
1096: DIR *dirp;
1097: struct dirent *dp;
1098: char *path;
1.104 djm 1099: int r, handle;
1100:
1101: if ((r = get_handle(iqueue, &handle)) != 0)
1.120 djm 1102: fatal_fr(r, "parse");
1.1 markus 1103:
1.58 djm 1104: debug("request %u: readdir \"%s\" (handle %d)", id,
1105: handle_to_name(handle), handle);
1.1 markus 1106: dirp = handle_to_dir(handle);
1107: path = handle_to_name(handle);
1108: if (dirp == NULL || path == NULL) {
1.10 markus 1109: send_status(id, SSH2_FX_FAILURE);
1.1 markus 1110: } else {
1111: struct stat st;
1.105 deraadt 1112: char pathname[PATH_MAX];
1.1 markus 1113: Stat *stats;
1114: int nstats = 10, count = 0, i;
1.36 deraadt 1115:
1.54 djm 1116: stats = xcalloc(nstats, sizeof(Stat));
1.1 markus 1117: while ((dp = readdir(dirp)) != NULL) {
1118: if (count >= nstats) {
1119: nstats *= 2;
1.106 deraadt 1120: stats = xreallocarray(stats, nstats, sizeof(Stat));
1.1 markus 1121: }
1122: /* XXX OVERFLOW ? */
1.30 jakob 1123: snprintf(pathname, sizeof pathname, "%s%s%s", path,
1124: strcmp(path, "/") ? "/" : "", dp->d_name);
1.116 deraadt 1125: if (lstat(pathname, &st) == -1)
1.1 markus 1126: continue;
1.13 markus 1127: stat_to_attrib(&st, &(stats[count].attrib));
1.1 markus 1128: stats[count].name = xstrdup(dp->d_name);
1.91 djm 1129: stats[count].long_name = ls_file(dp->d_name, &st, 0, 0);
1.1 markus 1130: count++;
1131: /* send up to 100 entries in one message */
1.11 markus 1132: /* XXX check packet size instead */
1.1 markus 1133: if (count == 100)
1134: break;
1135: }
1.10 markus 1136: if (count > 0) {
1137: send_names(id, count, stats);
1.31 deraadt 1138: for (i = 0; i < count; i++) {
1.97 djm 1139: free(stats[i].name);
1140: free(stats[i].long_name);
1.10 markus 1141: }
1142: } else {
1143: send_status(id, SSH2_FX_EOF);
1.1 markus 1144: }
1.97 djm 1145: free(stats);
1.1 markus 1146: }
1147: }
1148:
1.28 itojun 1149: static void
1.98 djm 1150: process_remove(u_int32_t id)
1.1 markus 1151: {
1152: char *name;
1.104 djm 1153: int r, status = SSH2_FX_FAILURE;
1154:
1155: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0)
1.120 djm 1156: fatal_fr(r, "parse");
1.1 markus 1157:
1.58 djm 1158: debug3("request %u: remove", id);
1159: logit("remove name \"%s\"", name);
1.104 djm 1160: r = unlink(name);
1161: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.1 markus 1162: send_status(id, status);
1.97 djm 1163: free(name);
1.1 markus 1164: }
1165:
1.28 itojun 1166: static void
1.98 djm 1167: process_mkdir(u_int32_t id)
1.1 markus 1168: {
1.104 djm 1169: Attrib a;
1.1 markus 1170: char *name;
1.104 djm 1171: int r, mode, status = SSH2_FX_FAILURE;
1172:
1173: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0 ||
1174: (r = decode_attrib(iqueue, &a)) != 0)
1.120 djm 1175: fatal_fr(r, "parse");
1.1 markus 1176:
1.104 djm 1177: mode = (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ?
1178: a.perm & 07777 : 0777;
1.58 djm 1179: debug3("request %u: mkdir", id);
1180: logit("mkdir name \"%s\" mode 0%o", name, mode);
1.104 djm 1181: r = mkdir(name, mode);
1182: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.1 markus 1183: send_status(id, status);
1.97 djm 1184: free(name);
1.1 markus 1185: }
1186:
1.28 itojun 1187: static void
1.98 djm 1188: process_rmdir(u_int32_t id)
1.1 markus 1189: {
1190: char *name;
1.104 djm 1191: int r, status;
1192:
1193: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0)
1.120 djm 1194: fatal_fr(r, "parse");
1.1 markus 1195:
1.58 djm 1196: debug3("request %u: rmdir", id);
1197: logit("rmdir name \"%s\"", name);
1.104 djm 1198: r = rmdir(name);
1199: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.1 markus 1200: send_status(id, status);
1.97 djm 1201: free(name);
1.1 markus 1202: }
1203:
1.28 itojun 1204: static void
1.98 djm 1205: process_realpath(u_int32_t id)
1.1 markus 1206: {
1.105 deraadt 1207: char resolvedname[PATH_MAX];
1.1 markus 1208: char *path;
1.104 djm 1209: int r;
1210:
1211: if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
1.120 djm 1212: fatal_fr(r, "parse");
1.1 markus 1213:
1.7 markus 1214: if (path[0] == '\0') {
1.97 djm 1215: free(path);
1.7 markus 1216: path = xstrdup(".");
1217: }
1.58 djm 1218: debug3("request %u: realpath", id);
1219: verbose("realpath \"%s\"", path);
1.117 djm 1220: if (sftp_realpath(path, resolvedname) == NULL) {
1.1 markus 1221: send_status(id, errno_to_portable(errno));
1222: } else {
1223: Stat s;
1224: attrib_clear(&s.attrib);
1225: s.name = s.long_name = resolvedname;
1226: send_names(id, 1, &s);
1227: }
1.97 djm 1228: free(path);
1.1 markus 1229: }
1230:
1.28 itojun 1231: static void
1.98 djm 1232: process_rename(u_int32_t id)
1.1 markus 1233: {
1234: char *oldpath, *newpath;
1.104 djm 1235: int r, status;
1.41 deraadt 1236: struct stat sb;
1.1 markus 1237:
1.104 djm 1238: if ((r = sshbuf_get_cstring(iqueue, &oldpath, NULL)) != 0 ||
1239: (r = sshbuf_get_cstring(iqueue, &newpath, NULL)) != 0)
1.120 djm 1240: fatal_fr(r, "parse");
1.104 djm 1241:
1.58 djm 1242: debug3("request %u: rename", id);
1243: logit("rename old \"%s\" new \"%s\"", oldpath, newpath);
1.41 deraadt 1244: status = SSH2_FX_FAILURE;
1.98 djm 1245: if (lstat(oldpath, &sb) == -1)
1.39 markus 1246: status = errno_to_portable(errno);
1.41 deraadt 1247: else if (S_ISREG(sb.st_mode)) {
1248: /* Race-free rename of regular files */
1.47 dtucker 1249: if (link(oldpath, newpath) == -1) {
1250: if (errno == EOPNOTSUPP) {
1251: struct stat st;
1252:
1253: /*
1254: * fs doesn't support links, so fall back to
1255: * stat+rename. This is racy.
1256: */
1257: if (stat(newpath, &st) == -1) {
1258: if (rename(oldpath, newpath) == -1)
1259: status =
1260: errno_to_portable(errno);
1261: else
1262: status = SSH2_FX_OK;
1263: }
1264: } else {
1265: status = errno_to_portable(errno);
1266: }
1267: } else if (unlink(oldpath) == -1) {
1.41 deraadt 1268: status = errno_to_portable(errno);
1269: /* clean spare link */
1270: unlink(newpath);
1271: } else
1272: status = SSH2_FX_OK;
1273: } else if (stat(newpath, &sb) == -1) {
1274: if (rename(oldpath, newpath) == -1)
1275: status = errno_to_portable(errno);
1276: else
1277: status = SSH2_FX_OK;
1278: }
1.1 markus 1279: send_status(id, status);
1.97 djm 1280: free(oldpath);
1281: free(newpath);
1.1 markus 1282: }
1283:
1.28 itojun 1284: static void
1.98 djm 1285: process_readlink(u_int32_t id)
1.23 djm 1286: {
1.104 djm 1287: int r, len;
1.105 deraadt 1288: char buf[PATH_MAX];
1.23 djm 1289: char *path;
1290:
1.104 djm 1291: if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
1.120 djm 1292: fatal_fr(r, "parse");
1.104 djm 1293:
1.58 djm 1294: debug3("request %u: readlink", id);
1295: verbose("readlink \"%s\"", path);
1.46 avsm 1296: if ((len = readlink(path, buf, sizeof(buf) - 1)) == -1)
1.23 djm 1297: send_status(id, errno_to_portable(errno));
1298: else {
1299: Stat s;
1.31 deraadt 1300:
1.46 avsm 1301: buf[len] = '\0';
1.23 djm 1302: attrib_clear(&s.attrib);
1.46 avsm 1303: s.name = s.long_name = buf;
1.23 djm 1304: send_names(id, 1, &s);
1305: }
1.97 djm 1306: free(path);
1.23 djm 1307: }
1308:
1.28 itojun 1309: static void
1.98 djm 1310: process_symlink(u_int32_t id)
1.23 djm 1311: {
1312: char *oldpath, *newpath;
1.104 djm 1313: int r, status;
1314:
1315: if ((r = sshbuf_get_cstring(iqueue, &oldpath, NULL)) != 0 ||
1316: (r = sshbuf_get_cstring(iqueue, &newpath, NULL)) != 0)
1.120 djm 1317: fatal_fr(r, "parse");
1.23 djm 1318:
1.58 djm 1319: debug3("request %u: symlink", id);
1320: logit("symlink old \"%s\" new \"%s\"", oldpath, newpath);
1.39 markus 1321: /* this will fail if 'newpath' exists */
1.104 djm 1322: r = symlink(oldpath, newpath);
1323: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.23 djm 1324: send_status(id, status);
1.97 djm 1325: free(oldpath);
1326: free(newpath);
1.23 djm 1327: }
1328:
1.28 itojun 1329: static void
1.78 djm 1330: process_extended_posix_rename(u_int32_t id)
1331: {
1332: char *oldpath, *newpath;
1.104 djm 1333: int r, status;
1334:
1335: if ((r = sshbuf_get_cstring(iqueue, &oldpath, NULL)) != 0 ||
1336: (r = sshbuf_get_cstring(iqueue, &newpath, NULL)) != 0)
1.120 djm 1337: fatal_fr(r, "parse");
1.78 djm 1338:
1339: debug3("request %u: posix-rename", id);
1340: logit("posix-rename old \"%s\" new \"%s\"", oldpath, newpath);
1.104 djm 1341: r = rename(oldpath, newpath);
1342: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.90 djm 1343: send_status(id, status);
1.97 djm 1344: free(oldpath);
1345: free(newpath);
1.78 djm 1346: }
1347:
1348: static void
1.79 djm 1349: process_extended_statvfs(u_int32_t id)
1350: {
1351: char *path;
1352: struct statvfs st;
1.104 djm 1353: int r;
1.79 djm 1354:
1.104 djm 1355: if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
1.120 djm 1356: fatal_fr(r, "parse");
1.103 dtucker 1357: debug3("request %u: statvfs", id);
1358: logit("statvfs \"%s\"", path);
1.79 djm 1359:
1360: if (statvfs(path, &st) != 0)
1361: send_status(id, errno_to_portable(errno));
1362: else
1363: send_statvfs(id, &st);
1.127 djm 1364: free(path);
1.79 djm 1365: }
1366:
1367: static void
1368: process_extended_fstatvfs(u_int32_t id)
1369: {
1.104 djm 1370: int r, handle, fd;
1.79 djm 1371: struct statvfs st;
1372:
1.104 djm 1373: if ((r = get_handle(iqueue, &handle)) != 0)
1.120 djm 1374: fatal_fr(r, "parse");
1.79 djm 1375: debug("request %u: fstatvfs \"%s\" (handle %u)",
1376: id, handle_to_name(handle), handle);
1377: if ((fd = handle_to_fd(handle)) < 0) {
1378: send_status(id, SSH2_FX_FAILURE);
1379: return;
1380: }
1381: if (fstatvfs(fd, &st) != 0)
1382: send_status(id, errno_to_portable(errno));
1383: else
1384: send_statvfs(id, &st);
1385: }
1386:
1387: static void
1.93 djm 1388: process_extended_hardlink(u_int32_t id)
1389: {
1390: char *oldpath, *newpath;
1.104 djm 1391: int r, status;
1392:
1393: if ((r = sshbuf_get_cstring(iqueue, &oldpath, NULL)) != 0 ||
1394: (r = sshbuf_get_cstring(iqueue, &newpath, NULL)) != 0)
1.120 djm 1395: fatal_fr(r, "parse");
1.93 djm 1396:
1397: debug3("request %u: hardlink", id);
1398: logit("hardlink old \"%s\" new \"%s\"", oldpath, newpath);
1.104 djm 1399: r = link(oldpath, newpath);
1400: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.93 djm 1401: send_status(id, status);
1.97 djm 1402: free(oldpath);
1403: free(newpath);
1.102 djm 1404: }
1405:
1406: static void
1407: process_extended_fsync(u_int32_t id)
1408: {
1.104 djm 1409: int handle, fd, r, status = SSH2_FX_OP_UNSUPPORTED;
1.102 djm 1410:
1.104 djm 1411: if ((r = get_handle(iqueue, &handle)) != 0)
1.120 djm 1412: fatal_fr(r, "parse");
1.102 djm 1413: debug3("request %u: fsync (handle %u)", id, handle);
1414: verbose("fsync \"%s\"", handle_to_name(handle));
1415: if ((fd = handle_to_fd(handle)) < 0)
1416: status = SSH2_FX_NO_SUCH_FILE;
1417: else if (handle_is_ok(handle, HANDLE_FILE)) {
1.104 djm 1418: r = fsync(fd);
1419: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.102 djm 1420: }
1421: send_status(id, status);
1.114 djm 1422: }
1423:
1424: static void
1425: process_extended_lsetstat(u_int32_t id)
1426: {
1427: Attrib a;
1428: char *name;
1429: int r, status = SSH2_FX_OK;
1430:
1431: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0 ||
1432: (r = decode_attrib(iqueue, &a)) != 0)
1.120 djm 1433: fatal_fr(r, "parse");
1.114 djm 1434:
1435: debug("request %u: lsetstat name \"%s\"", id, name);
1436: if (a.flags & SSH2_FILEXFER_ATTR_SIZE) {
1437: /* nonsensical for links */
1438: status = SSH2_FX_BAD_MESSAGE;
1439: goto out;
1440: }
1441: if (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
1442: logit("set \"%s\" mode %04o", name, a.perm);
1443: r = fchmodat(AT_FDCWD, name,
1444: a.perm & 07777, AT_SYMLINK_NOFOLLOW);
1445: if (r == -1)
1446: status = errno_to_portable(errno);
1447: }
1448: if (a.flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
1449: char buf[64];
1450: time_t t = a.mtime;
1451:
1452: strftime(buf, sizeof(buf), "%Y%m%d-%H:%M:%S",
1453: localtime(&t));
1454: logit("set \"%s\" modtime %s", name, buf);
1455: r = utimensat(AT_FDCWD, name,
1456: attrib_to_ts(&a), AT_SYMLINK_NOFOLLOW);
1457: if (r == -1)
1458: status = errno_to_portable(errno);
1459: }
1460: if (a.flags & SSH2_FILEXFER_ATTR_UIDGID) {
1461: logit("set \"%s\" owner %lu group %lu", name,
1462: (u_long)a.uid, (u_long)a.gid);
1463: r = fchownat(AT_FDCWD, name, a.uid, a.gid,
1464: AT_SYMLINK_NOFOLLOW);
1465: if (r == -1)
1466: status = errno_to_portable(errno);
1467: }
1468: out:
1469: send_status(id, status);
1470: free(name);
1.122 djm 1471: }
1472:
1473: static void
1474: process_extended_limits(u_int32_t id)
1475: {
1476: struct sshbuf *msg;
1477: int r;
1478: uint64_t nfiles = 0;
1479: struct rlimit rlim;
1480:
1481: debug("request %u: limits", id);
1482:
1483: if (getrlimit(RLIMIT_NOFILE, &rlim) != -1 && rlim.rlim_cur > 5)
1484: nfiles = rlim.rlim_cur - 5; /* stdio(3) + syslog + spare */
1485:
1486: if ((msg = sshbuf_new()) == NULL)
1487: fatal_f("sshbuf_new failed");
1488: if ((r = sshbuf_put_u8(msg, SSH2_FXP_EXTENDED_REPLY)) != 0 ||
1489: (r = sshbuf_put_u32(msg, id)) != 0 ||
1490: /* max-packet-length */
1491: (r = sshbuf_put_u64(msg, SFTP_MAX_MSG_LENGTH)) != 0 ||
1492: /* max-read-length */
1493: (r = sshbuf_put_u64(msg, SFTP_MAX_READ_LENGTH)) != 0 ||
1494: /* max-write-length */
1495: (r = sshbuf_put_u64(msg, SFTP_MAX_MSG_LENGTH - 1024)) != 0 ||
1496: /* max-open-handles */
1497: (r = sshbuf_put_u64(msg, nfiles)) != 0)
1498: fatal_fr(r, "compose");
1499: send_msg(msg);
1500: sshbuf_free(msg);
1.129 djm 1501: }
1502:
1503: static void
1504: process_extended_expand(u_int32_t id)
1505: {
1506: char cwd[PATH_MAX], resolvedname[PATH_MAX];
1507: char *path, *npath;
1508: int r;
1509: Stat s;
1510:
1511: if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
1512: fatal_fr(r, "parse");
1513: if (getcwd(cwd, sizeof(cwd)) == NULL) {
1514: send_status(id, errno_to_portable(errno));
1515: goto out;
1516: }
1517:
1518: debug3("request %u: expand, original \"%s\"", id, path);
1519: if (path[0] == '\0') {
1520: /* empty path */
1521: free(path);
1522: path = xstrdup(".");
1523: } else if (*path == '~') {
1524: /* ~ expand path */
1525: /* Special-case for "~" and "~/" to respect homedir flag */
1526: if (strcmp(path, "~") == 0) {
1527: free(path);
1528: path = xstrdup(cwd);
1529: } else if (strncmp(path, "~/", 2) == 0) {
1530: npath = xstrdup(path + 2);
1531: free(path);
1532: xasprintf(&path, "%s/%s", cwd, npath);
1.130 dtucker 1533: free(npath);
1.129 djm 1534: } else {
1535: /* ~user expansions */
1536: if (tilde_expand(path, pw->pw_uid, &npath) != 0) {
1.131 djm 1537: send_status(id, errno_to_portable(ENOENT));
1.129 djm 1538: goto out;
1539: }
1540: free(path);
1541: path = npath;
1542: }
1543: } else if (*path != '/') {
1544: /* relative path */
1545: xasprintf(&npath, "%s/%s", cwd, path);
1546: free(path);
1547: path = npath;
1548: }
1549: verbose("expand \"%s\"", path);
1550: if (sftp_realpath(path, resolvedname) == NULL) {
1551: send_status(id, errno_to_portable(errno));
1552: goto out;
1553: }
1554: attrib_clear(&s.attrib);
1555: s.name = s.long_name = resolvedname;
1556: send_names(id, 1, &s);
1557: out:
1558: free(path);
1.93 djm 1559: }
1560:
1561: static void
1.98 djm 1562: process_extended(u_int32_t id)
1.10 markus 1563: {
1564: char *request;
1.126 djm 1565: int r;
1.125 djm 1566: const struct sftp_handler *exthand;
1.10 markus 1567:
1.104 djm 1568: if ((r = sshbuf_get_cstring(iqueue, &request, NULL)) != 0)
1.120 djm 1569: fatal_fr(r, "parse");
1.125 djm 1570: if ((exthand = extended_handler_byname(request)) == NULL) {
1.98 djm 1571: error("Unknown extended request \"%.100s\"", request);
1.78 djm 1572: send_status(id, SSH2_FX_OP_UNSUPPORTED); /* MUST */
1.125 djm 1573: } else {
1574: if (!request_permitted(exthand))
1575: send_status(id, SSH2_FX_PERMISSION_DENIED);
1576: else
1577: exthand->handler(id);
1.98 djm 1578: }
1.97 djm 1579: free(request);
1.10 markus 1580: }
1.1 markus 1581:
1582: /* stolen from ssh-agent */
1583:
1.28 itojun 1584: static void
1.1 markus 1585: process(void)
1586: {
1.104 djm 1587: u_int msg_len;
1588: u_int buf_len;
1589: u_int consumed;
1590: u_char type;
1591: const u_char *cp;
1592: int i, r;
1.98 djm 1593: u_int32_t id;
1.1 markus 1594:
1.104 djm 1595: buf_len = sshbuf_len(iqueue);
1.34 markus 1596: if (buf_len < 5)
1.1 markus 1597: return; /* Incomplete message. */
1.104 djm 1598: cp = sshbuf_ptr(iqueue);
1.57 djm 1599: msg_len = get_u32(cp);
1.50 djm 1600: if (msg_len > SFTP_MAX_MSG_LENGTH) {
1.58 djm 1601: error("bad message from %s local user %s",
1602: client_addr, pw->pw_name);
1.76 markus 1603: sftp_server_cleanup_exit(11);
1.1 markus 1604: }
1.34 markus 1605: if (buf_len < msg_len + 4)
1.1 markus 1606: return;
1.104 djm 1607: if ((r = sshbuf_consume(iqueue, 4)) != 0)
1.120 djm 1608: fatal_fr(r, "consume");
1.34 markus 1609: buf_len -= 4;
1.104 djm 1610: if ((r = sshbuf_get_u8(iqueue, &type)) != 0)
1.120 djm 1611: fatal_fr(r, "parse type");
1.98 djm 1612:
1.1 markus 1613: switch (type) {
1.10 markus 1614: case SSH2_FXP_INIT:
1.1 markus 1615: process_init();
1.98 djm 1616: init_done = 1;
1.1 markus 1617: break;
1.10 markus 1618: case SSH2_FXP_EXTENDED:
1.98 djm 1619: if (!init_done)
1620: fatal("Received extended request before init");
1.104 djm 1621: if ((r = sshbuf_get_u32(iqueue, &id)) != 0)
1.120 djm 1622: fatal_fr(r, "parse extended ID");
1.98 djm 1623: process_extended(id);
1.10 markus 1624: break;
1.1 markus 1625: default:
1.98 djm 1626: if (!init_done)
1627: fatal("Received %u request before init", type);
1.104 djm 1628: if ((r = sshbuf_get_u32(iqueue, &id)) != 0)
1.120 djm 1629: fatal_fr(r, "parse ID");
1.98 djm 1630: for (i = 0; handlers[i].handler != NULL; i++) {
1631: if (type == handlers[i].type) {
1632: if (!request_permitted(&handlers[i])) {
1633: send_status(id,
1634: SSH2_FX_PERMISSION_DENIED);
1635: } else {
1636: handlers[i].handler(id);
1637: }
1638: break;
1639: }
1640: }
1641: if (handlers[i].handler == NULL)
1642: error("Unknown message %u", type);
1.1 markus 1643: }
1.34 markus 1644: /* discard the remaining bytes from the current packet */
1.104 djm 1645: if (buf_len < sshbuf_len(iqueue)) {
1.76 markus 1646: error("iqueue grew unexpectedly");
1647: sftp_server_cleanup_exit(255);
1648: }
1.104 djm 1649: consumed = buf_len - sshbuf_len(iqueue);
1.76 markus 1650: if (msg_len < consumed) {
1.98 djm 1651: error("msg_len %u < consumed %u", msg_len, consumed);
1.76 markus 1652: sftp_server_cleanup_exit(255);
1653: }
1.104 djm 1654: if (msg_len > consumed &&
1655: (r = sshbuf_consume(iqueue, msg_len - consumed)) != 0)
1.120 djm 1656: fatal_fr(r, "consume");
1.1 markus 1657: }
1658:
1.58 djm 1659: /* Cleanup handler that logs active handles upon normal exit */
1660: void
1.76 markus 1661: sftp_server_cleanup_exit(int i)
1.58 djm 1662: {
1663: if (pw != NULL && client_addr != NULL) {
1664: handle_log_exit();
1665: logit("session closed for local user %s from [%s]",
1666: pw->pw_name, client_addr);
1667: }
1668: _exit(i);
1669: }
1670:
1671: static void
1.76 markus 1672: sftp_server_usage(void)
1.58 djm 1673: {
1674: extern char *__progname;
1675:
1676: fprintf(stderr,
1.96 jmc 1677: "usage: %s [-ehR] [-d start_directory] [-f log_facility] "
1.118 djm 1678: "[-l log_level]\n\t[-P denied_requests] "
1679: "[-p allowed_requests] [-u umask]\n"
1.100 jmc 1680: " %s -Q protocol_feature\n",
1681: __progname, __progname);
1.58 djm 1682: exit(1);
1683: }
1684:
1.1 markus 1685: int
1.77 djm 1686: sftp_server_main(int argc, char **argv, struct passwd *user_pw)
1.1 markus 1687: {
1.132 deraadt 1688: int i, r, in, out, ch, skipargs = 0, log_stderr = 0;
1689: ssize_t len, olen;
1.58 djm 1690: SyslogFacility log_facility = SYSLOG_FACILITY_AUTH;
1.112 djm 1691: char *cp, *homedir = NULL, uidstr[32], buf[4*4096];
1.92 djm 1692: long mask;
1.58 djm 1693:
1694: extern char *optarg;
1695: extern char *__progname;
1.49 djm 1696:
1.58 djm 1697: log_init(__progname, log_level, log_facility, log_stderr);
1698:
1.95 djm 1699: pw = pwcopy(user_pw);
1700:
1.98 djm 1701: while (!skipargs && (ch = getopt(argc, argv,
1702: "d:f:l:P:p:Q:u:cehR")) != -1) {
1.58 djm 1703: switch (ch) {
1.98 djm 1704: case 'Q':
1705: if (strcasecmp(optarg, "requests") != 0) {
1706: fprintf(stderr, "Invalid query type\n");
1707: exit(1);
1708: }
1709: for (i = 0; handlers[i].handler != NULL; i++)
1710: printf("%s\n", handlers[i].name);
1711: for (i = 0; extended_handlers[i].handler != NULL; i++)
1712: printf("%s\n", extended_handlers[i].name);
1713: exit(0);
1714: break;
1.90 djm 1715: case 'R':
1716: readonly = 1;
1717: break;
1.58 djm 1718: case 'c':
1719: /*
1720: * Ignore all arguments if we are invoked as a
1.70 deraadt 1721: * shell using "sftp-server -c command"
1.58 djm 1722: */
1723: skipargs = 1;
1724: break;
1725: case 'e':
1726: log_stderr = 1;
1727: break;
1728: case 'l':
1729: log_level = log_level_number(optarg);
1730: if (log_level == SYSLOG_LEVEL_NOT_SET)
1731: error("Invalid log level \"%s\"", optarg);
1732: break;
1733: case 'f':
1734: log_facility = log_facility_number(optarg);
1.74 djm 1735: if (log_facility == SYSLOG_FACILITY_NOT_SET)
1.58 djm 1736: error("Invalid log facility \"%s\"", optarg);
1.86 djm 1737: break;
1.95 djm 1738: case 'd':
1739: cp = tilde_expand_filename(optarg, user_pw->pw_uid);
1.112 djm 1740: snprintf(uidstr, sizeof(uidstr), "%llu",
1741: (unsigned long long)pw->pw_uid);
1.95 djm 1742: homedir = percent_expand(cp, "d", user_pw->pw_dir,
1.112 djm 1743: "u", user_pw->pw_name, "U", uidstr, (char *)NULL);
1.95 djm 1744: free(cp);
1.98 djm 1745: break;
1746: case 'p':
1.118 djm 1747: if (request_allowlist != NULL)
1.98 djm 1748: fatal("Permitted requests already set");
1.118 djm 1749: request_allowlist = xstrdup(optarg);
1.98 djm 1750: break;
1751: case 'P':
1.118 djm 1752: if (request_denylist != NULL)
1.98 djm 1753: fatal("Refused requests already set");
1.118 djm 1754: request_denylist = xstrdup(optarg);
1.95 djm 1755: break;
1.86 djm 1756: case 'u':
1.92 djm 1757: errno = 0;
1758: mask = strtol(optarg, &cp, 8);
1759: if (mask < 0 || mask > 0777 || *cp != '\0' ||
1760: cp == optarg || (mask == 0 && errno != 0))
1761: fatal("Invalid umask \"%s\"", optarg);
1762: (void)umask((mode_t)mask);
1.58 djm 1763: break;
1764: case 'h':
1765: default:
1.76 markus 1766: sftp_server_usage();
1.58 djm 1767: }
1768: }
1769:
1770: log_init(__progname, log_level, log_facility, log_stderr);
1771:
1772: if ((cp = getenv("SSH_CONNECTION")) != NULL) {
1773: client_addr = xstrdup(cp);
1.76 markus 1774: if ((cp = strchr(client_addr, ' ')) == NULL) {
1775: error("Malformed SSH_CONNECTION variable: \"%s\"",
1.58 djm 1776: getenv("SSH_CONNECTION"));
1.76 markus 1777: sftp_server_cleanup_exit(255);
1778: }
1.58 djm 1779: *cp = '\0';
1780: } else
1781: client_addr = xstrdup("UNKNOWN");
1782:
1783: logit("session opened for local user %s from [%s]",
1784: pw->pw_name, client_addr);
1.10 markus 1785:
1.89 djm 1786: in = STDIN_FILENO;
1787: out = STDOUT_FILENO;
1.1 markus 1788:
1.104 djm 1789: if ((iqueue = sshbuf_new()) == NULL)
1.120 djm 1790: fatal_f("sshbuf_new failed");
1.104 djm 1791: if ((oqueue = sshbuf_new()) == NULL)
1.120 djm 1792: fatal_f("sshbuf_new failed");
1.1 markus 1793:
1.95 djm 1794: if (homedir != NULL) {
1795: if (chdir(homedir) != 0) {
1796: error("chdir to \"%s\" failed: %s", homedir,
1797: strerror(errno));
1798: }
1799: }
1.21 millert 1800:
1.1 markus 1801: for (;;) {
1.132 deraadt 1802: struct pollfd pfd[2];
1803:
1804: memset(pfd, 0, sizeof pfd);
1805: pfd[0].fd = pfd[1].fd = -1;
1.1 markus 1806:
1.73 djm 1807: /*
1808: * Ensure that we can read a full buffer and handle
1809: * the worst-case length packet it can generate,
1810: * otherwise apply backpressure by stopping reads.
1811: */
1.104 djm 1812: if ((r = sshbuf_check_reserve(iqueue, sizeof(buf))) == 0 &&
1813: (r = sshbuf_check_reserve(oqueue,
1.133 deraadt 1814: SFTP_MAX_MSG_LENGTH)) == 0) {
1.132 deraadt 1815: pfd[0].fd = in;
1.133 deraadt 1816: pfd[0].events = POLLIN;
1817: }
1.104 djm 1818: else if (r != SSH_ERR_NO_BUFFER_SPACE)
1.120 djm 1819: fatal_fr(r, "reserve");
1.73 djm 1820:
1.104 djm 1821: olen = sshbuf_len(oqueue);
1.133 deraadt 1822: if (olen > 0) {
1.132 deraadt 1823: pfd[1].fd = out;
1.133 deraadt 1824: pfd[1].events = POLLOUT;
1825: }
1.1 markus 1826:
1.132 deraadt 1827: if (poll(pfd, 2, -1) == -1) {
1.1 markus 1828: if (errno == EINTR)
1829: continue;
1.132 deraadt 1830: error("poll: %s", strerror(errno));
1.76 markus 1831: sftp_server_cleanup_exit(2);
1.1 markus 1832: }
1833:
1834: /* copy stdin to iqueue */
1.134 djm 1835: if (pfd[0].revents & (POLLIN|POLLHUP)) {
1.1 markus 1836: len = read(in, buf, sizeof buf);
1837: if (len == 0) {
1838: debug("read eof");
1.76 markus 1839: sftp_server_cleanup_exit(0);
1.116 deraadt 1840: } else if (len == -1) {
1.134 djm 1841: if (errno != EAGAIN && errno != EINTR) {
1842: error("read: %s", strerror(errno));
1843: sftp_server_cleanup_exit(1);
1844: }
1.120 djm 1845: } else if ((r = sshbuf_put(iqueue, buf, len)) != 0)
1846: fatal_fr(r, "sshbuf_put");
1.1 markus 1847: }
1848: /* send oqueue to stdout */
1.134 djm 1849: if (pfd[1].revents & (POLLOUT|POLLHUP)) {
1.104 djm 1850: len = write(out, sshbuf_ptr(oqueue), olen);
1.134 djm 1851: if (len == 0 || (len == -1 && errno == EPIPE)) {
1852: debug("write eof");
1853: sftp_server_cleanup_exit(0);
1854: } else if (len == -1) {
1.76 markus 1855: sftp_server_cleanup_exit(1);
1.134 djm 1856: if (errno != EAGAIN && errno != EINTR) {
1857: error("write: %s", strerror(errno));
1858: sftp_server_cleanup_exit(1);
1859: }
1.120 djm 1860: } else if ((r = sshbuf_consume(oqueue, len)) != 0)
1861: fatal_fr(r, "consume");
1.1 markus 1862: }
1.73 djm 1863:
1864: /*
1865: * Process requests from client if we can fit the results
1866: * into the output buffer, otherwise stop processing input
1867: * and let the output queue drain.
1868: */
1.104 djm 1869: r = sshbuf_check_reserve(oqueue, SFTP_MAX_MSG_LENGTH);
1870: if (r == 0)
1.73 djm 1871: process();
1.104 djm 1872: else if (r != SSH_ERR_NO_BUFFER_SPACE)
1.120 djm 1873: fatal_fr(r, "reserve");
1.1 markus 1874: }
1875: }
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