Annotation of src/usr.bin/ssh/sftp-server.c, Revision 1.140
1.140 ! djm 1: /* $OpenBSD: sftp-server.c,v 1.139 2022/02/01 23:32:51 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);
1.98 djm 114: static void process_extended(u_int32_t id);
115:
116: struct sftp_handler {
117: const char *name; /* user-visible name for fine-grained perms */
118: const char *ext_name; /* extended request name */
119: u_int type; /* packet type, for non extended packets */
120: void (*handler)(u_int32_t);
121: int does_write; /* if nonzero, banned for readonly mode */
122: };
123:
1.113 djm 124: static const struct sftp_handler handlers[] = {
1.98 djm 125: /* NB. SSH2_FXP_OPEN does the readonly check in the handler itself */
126: { "open", NULL, SSH2_FXP_OPEN, process_open, 0 },
127: { "close", NULL, SSH2_FXP_CLOSE, process_close, 0 },
128: { "read", NULL, SSH2_FXP_READ, process_read, 0 },
129: { "write", NULL, SSH2_FXP_WRITE, process_write, 1 },
130: { "lstat", NULL, SSH2_FXP_LSTAT, process_lstat, 0 },
131: { "fstat", NULL, SSH2_FXP_FSTAT, process_fstat, 0 },
132: { "setstat", NULL, SSH2_FXP_SETSTAT, process_setstat, 1 },
133: { "fsetstat", NULL, SSH2_FXP_FSETSTAT, process_fsetstat, 1 },
134: { "opendir", NULL, SSH2_FXP_OPENDIR, process_opendir, 0 },
135: { "readdir", NULL, SSH2_FXP_READDIR, process_readdir, 0 },
136: { "remove", NULL, SSH2_FXP_REMOVE, process_remove, 1 },
137: { "mkdir", NULL, SSH2_FXP_MKDIR, process_mkdir, 1 },
138: { "rmdir", NULL, SSH2_FXP_RMDIR, process_rmdir, 1 },
139: { "realpath", NULL, SSH2_FXP_REALPATH, process_realpath, 0 },
140: { "stat", NULL, SSH2_FXP_STAT, process_stat, 0 },
141: { "rename", NULL, SSH2_FXP_RENAME, process_rename, 1 },
142: { "readlink", NULL, SSH2_FXP_READLINK, process_readlink, 0 },
143: { "symlink", NULL, SSH2_FXP_SYMLINK, process_symlink, 1 },
144: { NULL, NULL, 0, NULL, 0 }
145: };
146:
147: /* SSH2_FXP_EXTENDED submessages */
1.113 djm 148: static const struct sftp_handler extended_handlers[] = {
1.98 djm 149: { "posix-rename", "posix-rename@openssh.com", 0,
1.127 djm 150: process_extended_posix_rename, 1 },
1.98 djm 151: { "statvfs", "statvfs@openssh.com", 0, process_extended_statvfs, 0 },
152: { "fstatvfs", "fstatvfs@openssh.com", 0, process_extended_fstatvfs, 0 },
153: { "hardlink", "hardlink@openssh.com", 0, process_extended_hardlink, 1 },
1.102 djm 154: { "fsync", "fsync@openssh.com", 0, process_extended_fsync, 1 },
1.114 djm 155: { "lsetstat", "lsetstat@openssh.com", 0, process_extended_lsetstat, 1 },
1.128 djm 156: { "limits", "limits@openssh.com", 0, process_extended_limits, 0 },
1.129 djm 157: { "expand-path", "expand-path@openssh.com", 0,
158: process_extended_expand, 0 },
1.140 ! djm 159: { "copy-data", "copy-data", 0, process_extended_copy_data, 1 },
1.98 djm 160: { NULL, NULL, 0, NULL, 0 }
161: };
162:
1.125 djm 163: static const struct sftp_handler *
164: extended_handler_byname(const char *name)
165: {
166: int i;
167:
168: for (i = 0; extended_handlers[i].handler != NULL; i++) {
169: if (strcmp(name, extended_handlers[i].ext_name) == 0)
170: return &extended_handlers[i];
171: }
172: return NULL;
173: }
174:
1.98 djm 175: static int
1.113 djm 176: request_permitted(const struct sftp_handler *h)
1.98 djm 177: {
178: char *result;
179:
180: if (readonly && h->does_write) {
181: verbose("Refusing %s request in read-only mode", h->name);
182: return 0;
183: }
1.118 djm 184: if (request_denylist != NULL &&
185: ((result = match_list(h->name, request_denylist, NULL))) != NULL) {
1.98 djm 186: free(result);
1.118 djm 187: verbose("Refusing denylisted %s request", h->name);
1.98 djm 188: return 0;
189: }
1.118 djm 190: if (request_allowlist != NULL &&
191: ((result = match_list(h->name, request_allowlist, NULL))) != NULL) {
1.98 djm 192: free(result);
1.118 djm 193: debug2("Permitting allowlisted %s request", h->name);
1.98 djm 194: return 1;
195: }
1.118 djm 196: if (request_allowlist != NULL) {
197: verbose("Refusing non-allowlisted %s request", h->name);
1.98 djm 198: return 0;
199: }
200: return 1;
201: }
202:
1.28 itojun 203: static int
1.2 markus 204: errno_to_portable(int unixerrno)
1.1 markus 205: {
206: int ret = 0;
1.22 deraadt 207:
1.2 markus 208: switch (unixerrno) {
1.1 markus 209: case 0:
1.10 markus 210: ret = SSH2_FX_OK;
1.1 markus 211: break;
212: case ENOENT:
213: case ENOTDIR:
214: case EBADF:
215: case ELOOP:
1.10 markus 216: ret = SSH2_FX_NO_SUCH_FILE;
1.1 markus 217: break;
218: case EPERM:
219: case EACCES:
220: case EFAULT:
1.10 markus 221: ret = SSH2_FX_PERMISSION_DENIED;
1.1 markus 222: break;
223: case ENAMETOOLONG:
224: case EINVAL:
1.10 markus 225: ret = SSH2_FX_BAD_MESSAGE;
1.82 dtucker 226: break;
227: case ENOSYS:
228: ret = SSH2_FX_OP_UNSUPPORTED;
1.1 markus 229: break;
230: default:
1.10 markus 231: ret = SSH2_FX_FAILURE;
1.1 markus 232: break;
233: }
234: return ret;
235: }
236:
1.28 itojun 237: static int
1.1 markus 238: flags_from_portable(int pflags)
239: {
240: int flags = 0;
1.22 deraadt 241:
1.20 deraadt 242: if ((pflags & SSH2_FXF_READ) &&
243: (pflags & SSH2_FXF_WRITE)) {
1.1 markus 244: flags = O_RDWR;
1.10 markus 245: } else if (pflags & SSH2_FXF_READ) {
1.1 markus 246: flags = O_RDONLY;
1.10 markus 247: } else if (pflags & SSH2_FXF_WRITE) {
1.1 markus 248: flags = O_WRONLY;
249: }
1.101 djm 250: if (pflags & SSH2_FXF_APPEND)
251: flags |= O_APPEND;
1.10 markus 252: if (pflags & SSH2_FXF_CREAT)
1.1 markus 253: flags |= O_CREAT;
1.10 markus 254: if (pflags & SSH2_FXF_TRUNC)
1.1 markus 255: flags |= O_TRUNC;
1.10 markus 256: if (pflags & SSH2_FXF_EXCL)
1.1 markus 257: flags |= O_EXCL;
258: return flags;
259: }
260:
1.58 djm 261: static const char *
262: string_from_portable(int pflags)
263: {
264: static char ret[128];
265:
266: *ret = '\0';
267:
268: #define PAPPEND(str) { \
269: if (*ret != '\0') \
270: strlcat(ret, ",", sizeof(ret)); \
1.70 deraadt 271: strlcat(ret, str, sizeof(ret)); \
1.58 djm 272: }
273:
274: if (pflags & SSH2_FXF_READ)
275: PAPPEND("READ")
276: if (pflags & SSH2_FXF_WRITE)
277: PAPPEND("WRITE")
1.101 djm 278: if (pflags & SSH2_FXF_APPEND)
279: PAPPEND("APPEND")
1.58 djm 280: if (pflags & SSH2_FXF_CREAT)
281: PAPPEND("CREATE")
282: if (pflags & SSH2_FXF_TRUNC)
283: PAPPEND("TRUNCATE")
284: if (pflags & SSH2_FXF_EXCL)
285: PAPPEND("EXCL")
286:
287: return ret;
288: }
289:
1.1 markus 290: /* handle handles */
291:
292: typedef struct Handle Handle;
293: struct Handle {
294: int use;
295: DIR *dirp;
296: int fd;
1.101 djm 297: int flags;
1.1 markus 298: char *name;
1.58 djm 299: u_int64_t bytes_read, bytes_write;
1.75 djm 300: int next_unused;
1.1 markus 301: };
1.22 deraadt 302:
1.1 markus 303: enum {
304: HANDLE_UNUSED,
305: HANDLE_DIR,
306: HANDLE_FILE
307: };
1.22 deraadt 308:
1.113 djm 309: static Handle *handles = NULL;
310: static u_int num_handles = 0;
311: static int first_unused_handle = -1;
1.75 djm 312:
313: static void handle_unused(int i)
314: {
315: handles[i].use = HANDLE_UNUSED;
316: handles[i].next_unused = first_unused_handle;
317: first_unused_handle = i;
1.1 markus 318: }
319:
1.28 itojun 320: static int
1.101 djm 321: handle_new(int use, const char *name, int fd, int flags, DIR *dirp)
1.1 markus 322: {
1.75 djm 323: int i;
324:
325: if (first_unused_handle == -1) {
326: if (num_handles + 1 <= num_handles)
327: return -1;
328: num_handles++;
1.106 deraadt 329: handles = xreallocarray(handles, num_handles, sizeof(Handle));
1.75 djm 330: handle_unused(num_handles - 1);
331: }
332:
333: i = first_unused_handle;
334: first_unused_handle = handles[i].next_unused;
335:
336: handles[i].use = use;
337: handles[i].dirp = dirp;
338: handles[i].fd = fd;
1.101 djm 339: handles[i].flags = flags;
1.75 djm 340: handles[i].name = xstrdup(name);
341: handles[i].bytes_read = handles[i].bytes_write = 0;
1.22 deraadt 342:
1.75 djm 343: return i;
1.1 markus 344: }
345:
1.28 itojun 346: static int
1.1 markus 347: handle_is_ok(int i, int type)
348: {
1.75 djm 349: return i >= 0 && (u_int)i < num_handles && handles[i].use == type;
1.1 markus 350: }
351:
1.28 itojun 352: static int
1.104 djm 353: handle_to_string(int handle, u_char **stringp, int *hlenp)
1.1 markus 354: {
355: if (stringp == NULL || hlenp == NULL)
356: return -1;
1.13 markus 357: *stringp = xmalloc(sizeof(int32_t));
1.57 djm 358: put_u32(*stringp, handle);
1.13 markus 359: *hlenp = sizeof(int32_t);
1.1 markus 360: return 0;
361: }
362:
1.28 itojun 363: static int
1.104 djm 364: handle_from_string(const u_char *handle, u_int hlen)
1.1 markus 365: {
1.13 markus 366: int val;
1.22 deraadt 367:
1.13 markus 368: if (hlen != sizeof(int32_t))
1.1 markus 369: return -1;
1.57 djm 370: val = get_u32(handle);
1.1 markus 371: if (handle_is_ok(val, HANDLE_FILE) ||
372: handle_is_ok(val, HANDLE_DIR))
373: return val;
374: return -1;
375: }
376:
1.28 itojun 377: static char *
1.1 markus 378: handle_to_name(int handle)
379: {
380: if (handle_is_ok(handle, HANDLE_DIR)||
381: handle_is_ok(handle, HANDLE_FILE))
382: return handles[handle].name;
383: return NULL;
384: }
385:
1.28 itojun 386: static DIR *
1.1 markus 387: handle_to_dir(int handle)
388: {
389: if (handle_is_ok(handle, HANDLE_DIR))
390: return handles[handle].dirp;
391: return NULL;
392: }
393:
1.28 itojun 394: static int
1.1 markus 395: handle_to_fd(int handle)
396: {
1.17 stevesk 397: if (handle_is_ok(handle, HANDLE_FILE))
1.1 markus 398: return handles[handle].fd;
399: return -1;
400: }
401:
1.101 djm 402: static int
403: handle_to_flags(int handle)
404: {
405: if (handle_is_ok(handle, HANDLE_FILE))
406: return handles[handle].flags;
407: return 0;
408: }
409:
1.58 djm 410: static void
411: handle_update_read(int handle, ssize_t bytes)
412: {
413: if (handle_is_ok(handle, HANDLE_FILE) && bytes > 0)
414: handles[handle].bytes_read += bytes;
415: }
416:
417: static void
418: handle_update_write(int handle, ssize_t bytes)
419: {
420: if (handle_is_ok(handle, HANDLE_FILE) && bytes > 0)
421: handles[handle].bytes_write += bytes;
422: }
423:
424: static u_int64_t
425: handle_bytes_read(int handle)
426: {
427: if (handle_is_ok(handle, HANDLE_FILE))
428: return (handles[handle].bytes_read);
429: return 0;
430: }
431:
432: static u_int64_t
433: handle_bytes_write(int handle)
434: {
435: if (handle_is_ok(handle, HANDLE_FILE))
436: return (handles[handle].bytes_write);
437: return 0;
438: }
439:
1.28 itojun 440: static int
1.1 markus 441: handle_close(int handle)
442: {
443: int ret = -1;
1.22 deraadt 444:
1.1 markus 445: if (handle_is_ok(handle, HANDLE_FILE)) {
446: ret = close(handles[handle].fd);
1.97 djm 447: free(handles[handle].name);
1.75 djm 448: handle_unused(handle);
1.1 markus 449: } else if (handle_is_ok(handle, HANDLE_DIR)) {
450: ret = closedir(handles[handle].dirp);
1.97 djm 451: free(handles[handle].name);
1.75 djm 452: handle_unused(handle);
1.1 markus 453: } else {
454: errno = ENOENT;
455: }
456: return ret;
457: }
458:
1.58 djm 459: static void
460: handle_log_close(int handle, char *emsg)
461: {
462: if (handle_is_ok(handle, HANDLE_FILE)) {
463: logit("%s%sclose \"%s\" bytes read %llu written %llu",
464: emsg == NULL ? "" : emsg, emsg == NULL ? "" : " ",
465: handle_to_name(handle),
1.72 stevesk 466: (unsigned long long)handle_bytes_read(handle),
467: (unsigned long long)handle_bytes_write(handle));
1.58 djm 468: } else {
469: logit("%s%sclosedir \"%s\"",
470: emsg == NULL ? "" : emsg, emsg == NULL ? "" : " ",
471: handle_to_name(handle));
472: }
473: }
474:
475: static void
476: handle_log_exit(void)
477: {
478: u_int i;
479:
1.75 djm 480: for (i = 0; i < num_handles; i++)
1.58 djm 481: if (handles[i].use != HANDLE_UNUSED)
482: handle_log_close(i, "forced");
483: }
484:
1.28 itojun 485: static int
1.104 djm 486: get_handle(struct sshbuf *queue, int *hp)
1.1 markus 487: {
1.104 djm 488: u_char *handle;
489: int r;
490: size_t hlen;
491:
492: *hp = -1;
493: if ((r = sshbuf_get_string(queue, &handle, &hlen)) != 0)
494: return r;
1.10 markus 495: if (hlen < 256)
1.104 djm 496: *hp = handle_from_string(handle, hlen);
1.97 djm 497: free(handle);
1.104 djm 498: return 0;
1.1 markus 499: }
500:
501: /* send replies */
502:
1.28 itojun 503: static void
1.104 djm 504: send_msg(struct sshbuf *m)
1.1 markus 505: {
1.104 djm 506: int r;
1.22 deraadt 507:
1.104 djm 508: if ((r = sshbuf_put_stringb(oqueue, m)) != 0)
1.120 djm 509: fatal_fr(r, "enqueue");
1.104 djm 510: sshbuf_reset(m);
1.1 markus 511: }
512:
1.58 djm 513: static const char *
514: status_to_message(u_int32_t status)
1.1 markus 515: {
1.139 djm 516: static const char * const status_messages[] = {
1.23 djm 517: "Success", /* SSH_FX_OK */
518: "End of file", /* SSH_FX_EOF */
519: "No such file", /* SSH_FX_NO_SUCH_FILE */
520: "Permission denied", /* SSH_FX_PERMISSION_DENIED */
521: "Failure", /* SSH_FX_FAILURE */
522: "Bad message", /* SSH_FX_BAD_MESSAGE */
523: "No connection", /* SSH_FX_NO_CONNECTION */
524: "Connection lost", /* SSH_FX_CONNECTION_LOST */
525: "Operation unsupported", /* SSH_FX_OP_UNSUPPORTED */
526: "Unknown error" /* Others */
527: };
1.110 deraadt 528: return (status_messages[MINIMUM(status,SSH2_FX_MAX)]);
1.58 djm 529: }
1.22 deraadt 530:
1.58 djm 531: static void
1.136 djm 532: send_status_errmsg(u_int32_t id, u_int32_t status, const char *errmsg)
1.58 djm 533: {
1.104 djm 534: struct sshbuf *msg;
535: int r;
1.58 djm 536:
537: debug3("request %u: sent status %u", id, status);
538: if (log_level > SYSLOG_LEVEL_VERBOSE ||
539: (status != SSH2_FX_OK && status != SSH2_FX_EOF))
540: logit("sent status %s", status_to_message(status));
1.104 djm 541: if ((msg = sshbuf_new()) == NULL)
1.120 djm 542: fatal_f("sshbuf_new failed");
1.104 djm 543: if ((r = sshbuf_put_u8(msg, SSH2_FXP_STATUS)) != 0 ||
544: (r = sshbuf_put_u32(msg, id)) != 0 ||
545: (r = sshbuf_put_u32(msg, status)) != 0)
1.120 djm 546: fatal_fr(r, "compose");
1.23 djm 547: if (version >= 3) {
1.136 djm 548: if ((r = sshbuf_put_cstring(msg, errmsg == NULL ?
549: status_to_message(status) : errmsg)) != 0 ||
1.104 djm 550: (r = sshbuf_put_cstring(msg, "")) != 0)
1.120 djm 551: fatal_fr(r, "compose message");
1.23 djm 552: }
1.104 djm 553: send_msg(msg);
554: sshbuf_free(msg);
1.1 markus 555: }
1.136 djm 556:
557: static void
558: send_status(u_int32_t id, u_int32_t status)
559: {
1.137 dtucker 560: send_status_errmsg(id, status, NULL);
1.136 djm 561: }
562:
1.28 itojun 563: static void
1.104 djm 564: send_data_or_handle(char type, u_int32_t id, const u_char *data, int dlen)
1.1 markus 565: {
1.104 djm 566: struct sshbuf *msg;
567: int r;
1.22 deraadt 568:
1.104 djm 569: if ((msg = sshbuf_new()) == NULL)
1.120 djm 570: fatal_f("sshbuf_new failed");
1.104 djm 571: if ((r = sshbuf_put_u8(msg, type)) != 0 ||
572: (r = sshbuf_put_u32(msg, id)) != 0 ||
573: (r = sshbuf_put_string(msg, data, dlen)) != 0)
1.120 djm 574: fatal_fr(r, "compose");
1.104 djm 575: send_msg(msg);
576: sshbuf_free(msg);
1.1 markus 577: }
578:
1.28 itojun 579: static void
1.104 djm 580: send_data(u_int32_t id, const u_char *data, int dlen)
1.1 markus 581: {
1.58 djm 582: debug("request %u: sent data len %d", id, dlen);
1.10 markus 583: send_data_or_handle(SSH2_FXP_DATA, id, data, dlen);
1.1 markus 584: }
585:
1.28 itojun 586: static void
1.1 markus 587: send_handle(u_int32_t id, int handle)
588: {
1.104 djm 589: u_char *string;
1.1 markus 590: int hlen;
1.22 deraadt 591:
1.1 markus 592: handle_to_string(handle, &string, &hlen);
1.58 djm 593: debug("request %u: sent handle handle %d", id, handle);
1.10 markus 594: send_data_or_handle(SSH2_FXP_HANDLE, id, string, hlen);
1.97 djm 595: free(string);
1.1 markus 596: }
597:
1.28 itojun 598: static void
1.44 jakob 599: send_names(u_int32_t id, int count, const Stat *stats)
1.1 markus 600: {
1.104 djm 601: struct sshbuf *msg;
602: int i, r;
1.22 deraadt 603:
1.104 djm 604: if ((msg = sshbuf_new()) == NULL)
1.120 djm 605: fatal_f("sshbuf_new failed");
1.104 djm 606: if ((r = sshbuf_put_u8(msg, SSH2_FXP_NAME)) != 0 ||
607: (r = sshbuf_put_u32(msg, id)) != 0 ||
608: (r = sshbuf_put_u32(msg, count)) != 0)
1.120 djm 609: fatal_fr(r, "compose");
1.58 djm 610: debug("request %u: sent names count %d", id, count);
1.1 markus 611: for (i = 0; i < count; i++) {
1.104 djm 612: if ((r = sshbuf_put_cstring(msg, stats[i].name)) != 0 ||
613: (r = sshbuf_put_cstring(msg, stats[i].long_name)) != 0 ||
614: (r = encode_attrib(msg, &stats[i].attrib)) != 0)
1.120 djm 615: fatal_fr(r, "compose filenames/attrib");
1.1 markus 616: }
1.104 djm 617: send_msg(msg);
618: sshbuf_free(msg);
1.1 markus 619: }
620:
1.28 itojun 621: static void
1.44 jakob 622: send_attrib(u_int32_t id, const Attrib *a)
1.1 markus 623: {
1.104 djm 624: struct sshbuf *msg;
625: int r;
1.22 deraadt 626:
1.58 djm 627: debug("request %u: sent attrib have 0x%x", id, a->flags);
1.104 djm 628: if ((msg = sshbuf_new()) == NULL)
1.120 djm 629: fatal_f("sshbuf_new failed");
1.104 djm 630: if ((r = sshbuf_put_u8(msg, SSH2_FXP_ATTRS)) != 0 ||
631: (r = sshbuf_put_u32(msg, id)) != 0 ||
632: (r = encode_attrib(msg, a)) != 0)
1.120 djm 633: fatal_fr(r, "compose");
1.104 djm 634: send_msg(msg);
635: sshbuf_free(msg);
1.1 markus 636: }
637:
1.79 djm 638: static void
639: send_statvfs(u_int32_t id, struct statvfs *st)
640: {
1.104 djm 641: struct sshbuf *msg;
1.79 djm 642: u_int64_t flag;
1.104 djm 643: int r;
1.79 djm 644:
645: flag = (st->f_flag & ST_RDONLY) ? SSH2_FXE_STATVFS_ST_RDONLY : 0;
646: flag |= (st->f_flag & ST_NOSUID) ? SSH2_FXE_STATVFS_ST_NOSUID : 0;
647:
1.104 djm 648: if ((msg = sshbuf_new()) == NULL)
1.120 djm 649: fatal_f("sshbuf_new failed");
1.104 djm 650: if ((r = sshbuf_put_u8(msg, SSH2_FXP_EXTENDED_REPLY)) != 0 ||
651: (r = sshbuf_put_u32(msg, id)) != 0 ||
652: (r = sshbuf_put_u64(msg, st->f_bsize)) != 0 ||
653: (r = sshbuf_put_u64(msg, st->f_frsize)) != 0 ||
654: (r = sshbuf_put_u64(msg, st->f_blocks)) != 0 ||
655: (r = sshbuf_put_u64(msg, st->f_bfree)) != 0 ||
656: (r = sshbuf_put_u64(msg, st->f_bavail)) != 0 ||
657: (r = sshbuf_put_u64(msg, st->f_files)) != 0 ||
658: (r = sshbuf_put_u64(msg, st->f_ffree)) != 0 ||
659: (r = sshbuf_put_u64(msg, st->f_favail)) != 0 ||
660: (r = sshbuf_put_u64(msg, st->f_fsid)) != 0 ||
661: (r = sshbuf_put_u64(msg, flag)) != 0 ||
662: (r = sshbuf_put_u64(msg, st->f_namemax)) != 0)
1.120 djm 663: fatal_fr(r, "compose");
1.104 djm 664: send_msg(msg);
665: sshbuf_free(msg);
1.79 djm 666: }
667:
1.125 djm 668: /*
669: * Prepare SSH2_FXP_VERSION extension advertisement for a single extension.
1.135 jsg 670: * The extension is checked for permission prior to advertisement.
1.125 djm 671: */
672: static int
673: compose_extension(struct sshbuf *msg, const char *name, const char *ver)
674: {
675: int r;
676: const struct sftp_handler *exthnd;
677:
678: if ((exthnd = extended_handler_byname(name)) == NULL)
679: fatal_f("internal error: no handler for %s", name);
680: if (!request_permitted(exthnd)) {
681: debug2_f("refusing to advertise disallowed extension %s", name);
682: return 0;
683: }
684: if ((r = sshbuf_put_cstring(msg, name)) != 0 ||
685: (r = sshbuf_put_cstring(msg, ver)) != 0)
686: fatal_fr(r, "compose %s", name);
687: return 0;
688: }
689:
1.1 markus 690: /* parse incoming */
691:
1.28 itojun 692: static void
1.1 markus 693: process_init(void)
694: {
1.104 djm 695: struct sshbuf *msg;
696: int r;
1.1 markus 697:
1.104 djm 698: if ((r = sshbuf_get_u32(iqueue, &version)) != 0)
1.120 djm 699: fatal_fr(r, "parse");
1.94 djm 700: verbose("received client version %u", version);
1.104 djm 701: if ((msg = sshbuf_new()) == NULL)
1.120 djm 702: fatal_f("sshbuf_new failed");
1.104 djm 703: if ((r = sshbuf_put_u8(msg, SSH2_FXP_VERSION)) != 0 ||
1.125 djm 704: (r = sshbuf_put_u32(msg, SSH2_FILEXFER_VERSION)) != 0)
1.120 djm 705: fatal_fr(r, "compose");
1.125 djm 706:
1.135 jsg 707: /* extension advertisements */
1.125 djm 708: compose_extension(msg, "posix-rename@openssh.com", "1");
709: compose_extension(msg, "statvfs@openssh.com", "2");
710: compose_extension(msg, "fstatvfs@openssh.com", "2");
711: compose_extension(msg, "hardlink@openssh.com", "1");
712: compose_extension(msg, "fsync@openssh.com", "1");
713: compose_extension(msg, "lsetstat@openssh.com", "1");
714: compose_extension(msg, "limits@openssh.com", "1");
1.129 djm 715: compose_extension(msg, "expand-path@openssh.com", "1");
1.140 ! djm 716: compose_extension(msg, "copy-data", "1");
1.125 djm 717:
1.104 djm 718: send_msg(msg);
719: sshbuf_free(msg);
1.1 markus 720: }
721:
1.28 itojun 722: static void
1.98 djm 723: process_open(u_int32_t id)
1.1 markus 724: {
1.98 djm 725: u_int32_t pflags;
1.104 djm 726: Attrib a;
1.1 markus 727: char *name;
1.104 djm 728: int r, handle, fd, flags, mode, status = SSH2_FX_FAILURE;
729:
730: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0 ||
731: (r = sshbuf_get_u32(iqueue, &pflags)) != 0 || /* portable flags */
732: (r = decode_attrib(iqueue, &a)) != 0)
1.120 djm 733: fatal_fr(r, "parse");
1.1 markus 734:
1.61 djm 735: debug3("request %u: open flags %d", id, pflags);
1.1 markus 736: flags = flags_from_portable(pflags);
1.104 djm 737: mode = (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ? a.perm : 0666;
1.58 djm 738: logit("open \"%s\" flags %s mode 0%o",
739: name, string_from_portable(pflags), mode);
1.90 djm 740: if (readonly &&
1.111 djm 741: ((flags & O_ACCMODE) != O_RDONLY ||
742: (flags & (O_CREAT|O_TRUNC)) != 0)) {
1.98 djm 743: verbose("Refusing open request in read-only mode");
1.104 djm 744: status = SSH2_FX_PERMISSION_DENIED;
1.98 djm 745: } else {
1.90 djm 746: fd = open(name, flags, mode);
1.116 deraadt 747: if (fd == -1) {
1.90 djm 748: status = errno_to_portable(errno);
1.1 markus 749: } else {
1.101 djm 750: handle = handle_new(HANDLE_FILE, name, fd, flags, NULL);
1.90 djm 751: if (handle < 0) {
752: close(fd);
753: } else {
754: send_handle(id, handle);
755: status = SSH2_FX_OK;
756: }
1.1 markus 757: }
758: }
1.10 markus 759: if (status != SSH2_FX_OK)
1.1 markus 760: send_status(id, status);
1.97 djm 761: free(name);
1.1 markus 762: }
763:
1.28 itojun 764: static void
1.98 djm 765: process_close(u_int32_t id)
1.1 markus 766: {
1.104 djm 767: int r, handle, ret, status = SSH2_FX_FAILURE;
768:
769: if ((r = get_handle(iqueue, &handle)) != 0)
1.120 djm 770: fatal_fr(r, "parse");
1.1 markus 771:
1.58 djm 772: debug3("request %u: close handle %u", id, handle);
773: handle_log_close(handle, NULL);
1.1 markus 774: ret = handle_close(handle);
1.10 markus 775: status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.1 markus 776: send_status(id, status);
777: }
778:
1.28 itojun 779: static void
1.98 djm 780: process_read(u_int32_t id)
1.1 markus 781: {
1.124 djm 782: static u_char *buf;
783: static size_t buflen;
1.98 djm 784: u_int32_t len;
1.104 djm 785: int r, handle, fd, ret, status = SSH2_FX_FAILURE;
1.1 markus 786: u_int64_t off;
787:
1.104 djm 788: if ((r = get_handle(iqueue, &handle)) != 0 ||
789: (r = sshbuf_get_u64(iqueue, &off)) != 0 ||
790: (r = sshbuf_get_u32(iqueue, &len)) != 0)
1.120 djm 791: fatal_fr(r, "parse");
1.1 markus 792:
1.124 djm 793: debug("request %u: read \"%s\" (handle %d) off %llu len %u",
1.58 djm 794: id, handle_to_name(handle), handle, (unsigned long long)off, len);
1.124 djm 795: if ((fd = handle_to_fd(handle)) == -1)
796: goto out;
797: if (len > SFTP_MAX_READ_LENGTH) {
798: debug2("read change len %u to %u", len, SFTP_MAX_READ_LENGTH);
799: len = SFTP_MAX_READ_LENGTH;
800: }
801: if (len > buflen) {
802: debug3_f("allocate %zu => %u", buflen, len);
803: if ((buf = realloc(NULL, len)) == NULL)
804: fatal_f("realloc failed");
805: buflen = len;
806: }
807: if (lseek(fd, off, SEEK_SET) == -1) {
808: status = errno_to_portable(errno);
809: error_f("seek \"%.100s\": %s", handle_to_name(handle),
810: strerror(errno));
811: goto out;
812: }
813: if (len == 0) {
814: /* weird, but not strictly disallowed */
815: ret = 0;
816: } else if ((ret = read(fd, buf, len)) == -1) {
817: status = errno_to_portable(errno);
818: error_f("read \"%.100s\": %s", handle_to_name(handle),
819: strerror(errno));
820: goto out;
821: } else if (ret == 0) {
822: status = SSH2_FX_EOF;
823: goto out;
824: }
825: send_data(id, buf, ret);
826: handle_update_read(handle, ret);
827: /* success */
828: status = SSH2_FX_OK;
829: out:
1.10 markus 830: if (status != SSH2_FX_OK)
1.1 markus 831: send_status(id, status);
832: }
833:
1.28 itojun 834: static void
1.98 djm 835: process_write(u_int32_t id)
1.1 markus 836: {
837: u_int64_t off;
1.104 djm 838: size_t len;
839: int r, handle, fd, ret, status;
840: u_char *data;
841:
842: if ((r = get_handle(iqueue, &handle)) != 0 ||
843: (r = sshbuf_get_u64(iqueue, &off)) != 0 ||
844: (r = sshbuf_get_string(iqueue, &data, &len)) != 0)
1.120 djm 845: fatal_fr(r, "parse");
1.1 markus 846:
1.104 djm 847: debug("request %u: write \"%s\" (handle %d) off %llu len %zu",
1.58 djm 848: id, handle_to_name(handle), handle, (unsigned long long)off, len);
1.1 markus 849: fd = handle_to_fd(handle);
1.104 djm 850:
1.90 djm 851: if (fd < 0)
852: status = SSH2_FX_FAILURE;
853: else {
1.101 djm 854: if (!(handle_to_flags(handle) & O_APPEND) &&
1.123 djm 855: lseek(fd, off, SEEK_SET) == -1) {
1.1 markus 856: status = errno_to_portable(errno);
1.123 djm 857: error_f("seek \"%.100s\": %s", handle_to_name(handle),
858: strerror(errno));
1.1 markus 859: } else {
860: /* XXX ATOMICIO ? */
861: ret = write(fd, data, len);
1.116 deraadt 862: if (ret == -1) {
1.1 markus 863: status = errno_to_portable(errno);
1.123 djm 864: error_f("write \"%.100s\": %s",
865: handle_to_name(handle), strerror(errno));
1.48 djm 866: } else if ((size_t)ret == len) {
1.10 markus 867: status = SSH2_FX_OK;
1.58 djm 868: handle_update_write(handle, ret);
1.1 markus 869: } else {
1.120 djm 870: debug2_f("nothing at all written");
1.90 djm 871: status = SSH2_FX_FAILURE;
1.1 markus 872: }
873: }
874: }
875: send_status(id, status);
1.97 djm 876: free(data);
1.1 markus 877: }
878:
1.28 itojun 879: static void
1.98 djm 880: process_do_stat(u_int32_t id, int do_lstat)
1.1 markus 881: {
1.13 markus 882: Attrib a;
1.1 markus 883: struct stat st;
884: char *name;
1.104 djm 885: int r, status = SSH2_FX_FAILURE;
886:
887: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0)
1.120 djm 888: fatal_fr(r, "parse");
1.1 markus 889:
1.58 djm 890: debug3("request %u: %sstat", id, do_lstat ? "l" : "");
891: verbose("%sstat name \"%s\"", do_lstat ? "l" : "", name);
1.104 djm 892: r = do_lstat ? lstat(name, &st) : stat(name, &st);
1.116 deraadt 893: if (r == -1) {
1.1 markus 894: status = errno_to_portable(errno);
895: } else {
1.13 markus 896: stat_to_attrib(&st, &a);
897: send_attrib(id, &a);
1.10 markus 898: status = SSH2_FX_OK;
1.1 markus 899: }
1.10 markus 900: if (status != SSH2_FX_OK)
1.1 markus 901: send_status(id, status);
1.97 djm 902: free(name);
1.1 markus 903: }
904:
1.28 itojun 905: static void
1.98 djm 906: process_stat(u_int32_t id)
1.1 markus 907: {
1.98 djm 908: process_do_stat(id, 0);
1.1 markus 909: }
910:
1.28 itojun 911: static void
1.98 djm 912: process_lstat(u_int32_t id)
1.1 markus 913: {
1.98 djm 914: process_do_stat(id, 1);
1.1 markus 915: }
916:
1.28 itojun 917: static void
1.98 djm 918: process_fstat(u_int32_t id)
1.1 markus 919: {
1.13 markus 920: Attrib a;
1.1 markus 921: struct stat st;
1.104 djm 922: int fd, r, handle, status = SSH2_FX_FAILURE;
1.1 markus 923:
1.104 djm 924: if ((r = get_handle(iqueue, &handle)) != 0)
1.120 djm 925: fatal_fr(r, "parse");
1.58 djm 926: debug("request %u: fstat \"%s\" (handle %u)",
927: id, handle_to_name(handle), handle);
1.1 markus 928: fd = handle_to_fd(handle);
1.71 stevesk 929: if (fd >= 0) {
1.104 djm 930: r = fstat(fd, &st);
1.116 deraadt 931: if (r == -1) {
1.1 markus 932: status = errno_to_portable(errno);
933: } else {
1.13 markus 934: stat_to_attrib(&st, &a);
935: send_attrib(id, &a);
1.10 markus 936: status = SSH2_FX_OK;
1.1 markus 937: }
938: }
1.10 markus 939: if (status != SSH2_FX_OK)
1.1 markus 940: send_status(id, status);
941: }
942:
1.28 itojun 943: static struct timeval *
1.44 jakob 944: attrib_to_tv(const Attrib *a)
1.1 markus 945: {
946: static struct timeval tv[2];
1.22 deraadt 947:
1.1 markus 948: tv[0].tv_sec = a->atime;
949: tv[0].tv_usec = 0;
950: tv[1].tv_sec = a->mtime;
951: tv[1].tv_usec = 0;
952: return tv;
953: }
954:
1.114 djm 955: static struct timespec *
956: attrib_to_ts(const Attrib *a)
957: {
958: static struct timespec ts[2];
959:
960: ts[0].tv_sec = a->atime;
961: ts[0].tv_nsec = 0;
962: ts[1].tv_sec = a->mtime;
963: ts[1].tv_nsec = 0;
964: return ts;
965: }
966:
1.28 itojun 967: static void
1.98 djm 968: process_setstat(u_int32_t id)
1.1 markus 969: {
1.104 djm 970: Attrib a;
1.1 markus 971: char *name;
1.104 djm 972: int r, status = SSH2_FX_OK;
973:
974: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0 ||
975: (r = decode_attrib(iqueue, &a)) != 0)
1.120 djm 976: fatal_fr(r, "parse");
1.1 markus 977:
1.58 djm 978: debug("request %u: setstat name \"%s\"", id, name);
1.104 djm 979: if (a.flags & SSH2_FILEXFER_ATTR_SIZE) {
1.72 stevesk 980: logit("set \"%s\" size %llu",
1.104 djm 981: name, (unsigned long long)a.size);
982: r = truncate(name, a.size);
983: if (r == -1)
1.33 markus 984: status = errno_to_portable(errno);
985: }
1.104 djm 986: if (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
987: logit("set \"%s\" mode %04o", name, a.perm);
988: r = chmod(name, a.perm & 07777);
989: if (r == -1)
1.1 markus 990: status = errno_to_portable(errno);
991: }
1.104 djm 992: if (a.flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
1.58 djm 993: char buf[64];
1.104 djm 994: time_t t = a.mtime;
1.58 djm 995:
996: strftime(buf, sizeof(buf), "%Y%m%d-%H:%M:%S",
997: localtime(&t));
998: logit("set \"%s\" modtime %s", name, buf);
1.104 djm 999: r = utimes(name, attrib_to_tv(&a));
1000: if (r == -1)
1.1 markus 1001: status = errno_to_portable(errno);
1002: }
1.104 djm 1003: if (a.flags & SSH2_FILEXFER_ATTR_UIDGID) {
1.58 djm 1004: logit("set \"%s\" owner %lu group %lu", name,
1.104 djm 1005: (u_long)a.uid, (u_long)a.gid);
1006: r = chown(name, a.uid, a.gid);
1007: if (r == -1)
1.18 stevesk 1008: status = errno_to_portable(errno);
1009: }
1.1 markus 1010: send_status(id, status);
1.97 djm 1011: free(name);
1.1 markus 1012: }
1013:
1.28 itojun 1014: static void
1.98 djm 1015: process_fsetstat(u_int32_t id)
1.1 markus 1016: {
1.104 djm 1017: Attrib a;
1018: int handle, fd, r;
1.10 markus 1019: int status = SSH2_FX_OK;
1.1 markus 1020:
1.104 djm 1021: if ((r = get_handle(iqueue, &handle)) != 0 ||
1022: (r = decode_attrib(iqueue, &a)) != 0)
1.120 djm 1023: fatal_fr(r, "parse");
1.104 djm 1024:
1.58 djm 1025: debug("request %u: fsetstat handle %d", id, handle);
1.1 markus 1026: fd = handle_to_fd(handle);
1.90 djm 1027: if (fd < 0)
1.10 markus 1028: status = SSH2_FX_FAILURE;
1.90 djm 1029: else {
1.58 djm 1030: char *name = handle_to_name(handle);
1031:
1.104 djm 1032: if (a.flags & SSH2_FILEXFER_ATTR_SIZE) {
1.72 stevesk 1033: logit("set \"%s\" size %llu",
1.104 djm 1034: name, (unsigned long long)a.size);
1035: r = ftruncate(fd, a.size);
1036: if (r == -1)
1.33 markus 1037: status = errno_to_portable(errno);
1038: }
1.104 djm 1039: if (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
1040: logit("set \"%s\" mode %04o", name, a.perm);
1041: r = fchmod(fd, a.perm & 07777);
1042: if (r == -1)
1.1 markus 1043: status = errno_to_portable(errno);
1044: }
1.104 djm 1045: if (a.flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
1.58 djm 1046: char buf[64];
1.104 djm 1047: time_t t = a.mtime;
1.58 djm 1048:
1049: strftime(buf, sizeof(buf), "%Y%m%d-%H:%M:%S",
1050: localtime(&t));
1051: logit("set \"%s\" modtime %s", name, buf);
1.104 djm 1052: r = futimes(fd, attrib_to_tv(&a));
1053: if (r == -1)
1.18 stevesk 1054: status = errno_to_portable(errno);
1055: }
1.104 djm 1056: if (a.flags & SSH2_FILEXFER_ATTR_UIDGID) {
1.58 djm 1057: logit("set \"%s\" owner %lu group %lu", name,
1.104 djm 1058: (u_long)a.uid, (u_long)a.gid);
1059: r = fchown(fd, a.uid, a.gid);
1060: if (r == -1)
1.1 markus 1061: status = errno_to_portable(errno);
1062: }
1063: }
1064: send_status(id, status);
1065: }
1066:
1.28 itojun 1067: static void
1.98 djm 1068: process_opendir(u_int32_t id)
1.1 markus 1069: {
1070: DIR *dirp = NULL;
1071: char *path;
1.104 djm 1072: int r, handle, status = SSH2_FX_FAILURE;
1073:
1074: if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
1.120 djm 1075: fatal_fr(r, "parse");
1.1 markus 1076:
1.58 djm 1077: debug3("request %u: opendir", id);
1078: logit("opendir \"%s\"", path);
1.17 stevesk 1079: dirp = opendir(path);
1.1 markus 1080: if (dirp == NULL) {
1081: status = errno_to_portable(errno);
1082: } else {
1.101 djm 1083: handle = handle_new(HANDLE_DIR, path, 0, 0, dirp);
1.1 markus 1084: if (handle < 0) {
1085: closedir(dirp);
1086: } else {
1087: send_handle(id, handle);
1.10 markus 1088: status = SSH2_FX_OK;
1.1 markus 1089: }
1.17 stevesk 1090:
1.1 markus 1091: }
1.10 markus 1092: if (status != SSH2_FX_OK)
1.1 markus 1093: send_status(id, status);
1.97 djm 1094: free(path);
1.1 markus 1095: }
1096:
1.28 itojun 1097: static void
1.98 djm 1098: process_readdir(u_int32_t id)
1.1 markus 1099: {
1100: DIR *dirp;
1101: struct dirent *dp;
1102: char *path;
1.104 djm 1103: int r, handle;
1104:
1105: if ((r = get_handle(iqueue, &handle)) != 0)
1.120 djm 1106: fatal_fr(r, "parse");
1.1 markus 1107:
1.58 djm 1108: debug("request %u: readdir \"%s\" (handle %d)", id,
1109: handle_to_name(handle), handle);
1.1 markus 1110: dirp = handle_to_dir(handle);
1111: path = handle_to_name(handle);
1112: if (dirp == NULL || path == NULL) {
1.10 markus 1113: send_status(id, SSH2_FX_FAILURE);
1.1 markus 1114: } else {
1115: struct stat st;
1.105 deraadt 1116: char pathname[PATH_MAX];
1.1 markus 1117: Stat *stats;
1118: int nstats = 10, count = 0, i;
1.36 deraadt 1119:
1.54 djm 1120: stats = xcalloc(nstats, sizeof(Stat));
1.1 markus 1121: while ((dp = readdir(dirp)) != NULL) {
1122: if (count >= nstats) {
1123: nstats *= 2;
1.106 deraadt 1124: stats = xreallocarray(stats, nstats, sizeof(Stat));
1.1 markus 1125: }
1126: /* XXX OVERFLOW ? */
1.30 jakob 1127: snprintf(pathname, sizeof pathname, "%s%s%s", path,
1128: strcmp(path, "/") ? "/" : "", dp->d_name);
1.116 deraadt 1129: if (lstat(pathname, &st) == -1)
1.1 markus 1130: continue;
1.13 markus 1131: stat_to_attrib(&st, &(stats[count].attrib));
1.1 markus 1132: stats[count].name = xstrdup(dp->d_name);
1.91 djm 1133: stats[count].long_name = ls_file(dp->d_name, &st, 0, 0);
1.1 markus 1134: count++;
1135: /* send up to 100 entries in one message */
1.11 markus 1136: /* XXX check packet size instead */
1.1 markus 1137: if (count == 100)
1138: break;
1139: }
1.10 markus 1140: if (count > 0) {
1141: send_names(id, count, stats);
1.31 deraadt 1142: for (i = 0; i < count; i++) {
1.97 djm 1143: free(stats[i].name);
1144: free(stats[i].long_name);
1.10 markus 1145: }
1146: } else {
1147: send_status(id, SSH2_FX_EOF);
1.1 markus 1148: }
1.97 djm 1149: free(stats);
1.1 markus 1150: }
1151: }
1152:
1.28 itojun 1153: static void
1.98 djm 1154: process_remove(u_int32_t id)
1.1 markus 1155: {
1156: char *name;
1.104 djm 1157: int r, status = SSH2_FX_FAILURE;
1158:
1159: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0)
1.120 djm 1160: fatal_fr(r, "parse");
1.1 markus 1161:
1.58 djm 1162: debug3("request %u: remove", id);
1163: logit("remove name \"%s\"", name);
1.104 djm 1164: r = unlink(name);
1165: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.1 markus 1166: send_status(id, status);
1.97 djm 1167: free(name);
1.1 markus 1168: }
1169:
1.28 itojun 1170: static void
1.98 djm 1171: process_mkdir(u_int32_t id)
1.1 markus 1172: {
1.104 djm 1173: Attrib a;
1.1 markus 1174: char *name;
1.104 djm 1175: int r, mode, status = SSH2_FX_FAILURE;
1176:
1177: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0 ||
1178: (r = decode_attrib(iqueue, &a)) != 0)
1.120 djm 1179: fatal_fr(r, "parse");
1.1 markus 1180:
1.104 djm 1181: mode = (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ?
1182: a.perm & 07777 : 0777;
1.58 djm 1183: debug3("request %u: mkdir", id);
1184: logit("mkdir name \"%s\" mode 0%o", name, mode);
1.104 djm 1185: r = mkdir(name, mode);
1186: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.1 markus 1187: send_status(id, status);
1.97 djm 1188: free(name);
1.1 markus 1189: }
1190:
1.28 itojun 1191: static void
1.98 djm 1192: process_rmdir(u_int32_t id)
1.1 markus 1193: {
1194: char *name;
1.104 djm 1195: int r, status;
1196:
1197: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0)
1.120 djm 1198: fatal_fr(r, "parse");
1.1 markus 1199:
1.58 djm 1200: debug3("request %u: rmdir", id);
1201: logit("rmdir name \"%s\"", name);
1.104 djm 1202: r = rmdir(name);
1203: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.1 markus 1204: send_status(id, status);
1.97 djm 1205: free(name);
1.1 markus 1206: }
1207:
1.28 itojun 1208: static void
1.98 djm 1209: process_realpath(u_int32_t id)
1.1 markus 1210: {
1.105 deraadt 1211: char resolvedname[PATH_MAX];
1.1 markus 1212: char *path;
1.104 djm 1213: int r;
1214:
1215: if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
1.120 djm 1216: fatal_fr(r, "parse");
1.1 markus 1217:
1.7 markus 1218: if (path[0] == '\0') {
1.97 djm 1219: free(path);
1.7 markus 1220: path = xstrdup(".");
1221: }
1.58 djm 1222: debug3("request %u: realpath", id);
1223: verbose("realpath \"%s\"", path);
1.117 djm 1224: if (sftp_realpath(path, resolvedname) == NULL) {
1.1 markus 1225: send_status(id, errno_to_portable(errno));
1226: } else {
1227: Stat s;
1228: attrib_clear(&s.attrib);
1229: s.name = s.long_name = resolvedname;
1230: send_names(id, 1, &s);
1231: }
1.97 djm 1232: free(path);
1.1 markus 1233: }
1234:
1.28 itojun 1235: static void
1.98 djm 1236: process_rename(u_int32_t id)
1.1 markus 1237: {
1238: char *oldpath, *newpath;
1.104 djm 1239: int r, status;
1.41 deraadt 1240: struct stat sb;
1.1 markus 1241:
1.104 djm 1242: if ((r = sshbuf_get_cstring(iqueue, &oldpath, NULL)) != 0 ||
1243: (r = sshbuf_get_cstring(iqueue, &newpath, NULL)) != 0)
1.120 djm 1244: fatal_fr(r, "parse");
1.104 djm 1245:
1.58 djm 1246: debug3("request %u: rename", id);
1247: logit("rename old \"%s\" new \"%s\"", oldpath, newpath);
1.41 deraadt 1248: status = SSH2_FX_FAILURE;
1.98 djm 1249: if (lstat(oldpath, &sb) == -1)
1.39 markus 1250: status = errno_to_portable(errno);
1.41 deraadt 1251: else if (S_ISREG(sb.st_mode)) {
1252: /* Race-free rename of regular files */
1.47 dtucker 1253: if (link(oldpath, newpath) == -1) {
1254: if (errno == EOPNOTSUPP) {
1255: struct stat st;
1256:
1257: /*
1258: * fs doesn't support links, so fall back to
1259: * stat+rename. This is racy.
1260: */
1261: if (stat(newpath, &st) == -1) {
1262: if (rename(oldpath, newpath) == -1)
1263: status =
1264: errno_to_portable(errno);
1265: else
1266: status = SSH2_FX_OK;
1267: }
1268: } else {
1269: status = errno_to_portable(errno);
1270: }
1271: } else if (unlink(oldpath) == -1) {
1.41 deraadt 1272: status = errno_to_portable(errno);
1273: /* clean spare link */
1274: unlink(newpath);
1275: } else
1276: status = SSH2_FX_OK;
1277: } else if (stat(newpath, &sb) == -1) {
1278: if (rename(oldpath, newpath) == -1)
1279: status = errno_to_portable(errno);
1280: else
1281: status = SSH2_FX_OK;
1282: }
1.1 markus 1283: send_status(id, status);
1.97 djm 1284: free(oldpath);
1285: free(newpath);
1.1 markus 1286: }
1287:
1.28 itojun 1288: static void
1.98 djm 1289: process_readlink(u_int32_t id)
1.23 djm 1290: {
1.104 djm 1291: int r, len;
1.105 deraadt 1292: char buf[PATH_MAX];
1.23 djm 1293: char *path;
1294:
1.104 djm 1295: if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
1.120 djm 1296: fatal_fr(r, "parse");
1.104 djm 1297:
1.58 djm 1298: debug3("request %u: readlink", id);
1299: verbose("readlink \"%s\"", path);
1.46 avsm 1300: if ((len = readlink(path, buf, sizeof(buf) - 1)) == -1)
1.23 djm 1301: send_status(id, errno_to_portable(errno));
1302: else {
1303: Stat s;
1.31 deraadt 1304:
1.46 avsm 1305: buf[len] = '\0';
1.23 djm 1306: attrib_clear(&s.attrib);
1.46 avsm 1307: s.name = s.long_name = buf;
1.23 djm 1308: send_names(id, 1, &s);
1309: }
1.97 djm 1310: free(path);
1.23 djm 1311: }
1312:
1.28 itojun 1313: static void
1.98 djm 1314: process_symlink(u_int32_t id)
1.23 djm 1315: {
1316: char *oldpath, *newpath;
1.104 djm 1317: int r, status;
1318:
1319: if ((r = sshbuf_get_cstring(iqueue, &oldpath, NULL)) != 0 ||
1320: (r = sshbuf_get_cstring(iqueue, &newpath, NULL)) != 0)
1.120 djm 1321: fatal_fr(r, "parse");
1.23 djm 1322:
1.58 djm 1323: debug3("request %u: symlink", id);
1324: logit("symlink old \"%s\" new \"%s\"", oldpath, newpath);
1.39 markus 1325: /* this will fail if 'newpath' exists */
1.104 djm 1326: r = symlink(oldpath, newpath);
1327: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.23 djm 1328: send_status(id, status);
1.97 djm 1329: free(oldpath);
1330: free(newpath);
1.23 djm 1331: }
1332:
1.28 itojun 1333: static void
1.78 djm 1334: process_extended_posix_rename(u_int32_t id)
1335: {
1336: char *oldpath, *newpath;
1.104 djm 1337: int r, status;
1338:
1339: if ((r = sshbuf_get_cstring(iqueue, &oldpath, NULL)) != 0 ||
1340: (r = sshbuf_get_cstring(iqueue, &newpath, NULL)) != 0)
1.120 djm 1341: fatal_fr(r, "parse");
1.78 djm 1342:
1343: debug3("request %u: posix-rename", id);
1344: logit("posix-rename old \"%s\" new \"%s\"", oldpath, newpath);
1.104 djm 1345: r = rename(oldpath, newpath);
1346: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.90 djm 1347: send_status(id, status);
1.97 djm 1348: free(oldpath);
1349: free(newpath);
1.78 djm 1350: }
1351:
1352: static void
1.79 djm 1353: process_extended_statvfs(u_int32_t id)
1354: {
1355: char *path;
1356: struct statvfs st;
1.104 djm 1357: int r;
1.79 djm 1358:
1.104 djm 1359: if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
1.120 djm 1360: fatal_fr(r, "parse");
1.103 dtucker 1361: debug3("request %u: statvfs", id);
1362: logit("statvfs \"%s\"", path);
1.79 djm 1363:
1364: if (statvfs(path, &st) != 0)
1365: send_status(id, errno_to_portable(errno));
1366: else
1367: send_statvfs(id, &st);
1.127 djm 1368: free(path);
1.79 djm 1369: }
1370:
1371: static void
1372: process_extended_fstatvfs(u_int32_t id)
1373: {
1.104 djm 1374: int r, handle, fd;
1.79 djm 1375: struct statvfs st;
1376:
1.104 djm 1377: if ((r = get_handle(iqueue, &handle)) != 0)
1.120 djm 1378: fatal_fr(r, "parse");
1.79 djm 1379: debug("request %u: fstatvfs \"%s\" (handle %u)",
1380: id, handle_to_name(handle), handle);
1381: if ((fd = handle_to_fd(handle)) < 0) {
1382: send_status(id, SSH2_FX_FAILURE);
1383: return;
1384: }
1385: if (fstatvfs(fd, &st) != 0)
1386: send_status(id, errno_to_portable(errno));
1387: else
1388: send_statvfs(id, &st);
1389: }
1390:
1391: static void
1.93 djm 1392: process_extended_hardlink(u_int32_t id)
1393: {
1394: char *oldpath, *newpath;
1.104 djm 1395: int r, status;
1396:
1397: if ((r = sshbuf_get_cstring(iqueue, &oldpath, NULL)) != 0 ||
1398: (r = sshbuf_get_cstring(iqueue, &newpath, NULL)) != 0)
1.120 djm 1399: fatal_fr(r, "parse");
1.93 djm 1400:
1401: debug3("request %u: hardlink", id);
1402: logit("hardlink old \"%s\" new \"%s\"", oldpath, newpath);
1.104 djm 1403: r = link(oldpath, newpath);
1404: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.93 djm 1405: send_status(id, status);
1.97 djm 1406: free(oldpath);
1407: free(newpath);
1.102 djm 1408: }
1409:
1410: static void
1411: process_extended_fsync(u_int32_t id)
1412: {
1.104 djm 1413: int handle, fd, r, status = SSH2_FX_OP_UNSUPPORTED;
1.102 djm 1414:
1.104 djm 1415: if ((r = get_handle(iqueue, &handle)) != 0)
1.120 djm 1416: fatal_fr(r, "parse");
1.102 djm 1417: debug3("request %u: fsync (handle %u)", id, handle);
1418: verbose("fsync \"%s\"", handle_to_name(handle));
1419: if ((fd = handle_to_fd(handle)) < 0)
1420: status = SSH2_FX_NO_SUCH_FILE;
1421: else if (handle_is_ok(handle, HANDLE_FILE)) {
1.104 djm 1422: r = fsync(fd);
1423: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.102 djm 1424: }
1425: send_status(id, status);
1.114 djm 1426: }
1427:
1428: static void
1429: process_extended_lsetstat(u_int32_t id)
1430: {
1431: Attrib a;
1432: char *name;
1433: int r, status = SSH2_FX_OK;
1434:
1435: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0 ||
1436: (r = decode_attrib(iqueue, &a)) != 0)
1.120 djm 1437: fatal_fr(r, "parse");
1.114 djm 1438:
1439: debug("request %u: lsetstat name \"%s\"", id, name);
1440: if (a.flags & SSH2_FILEXFER_ATTR_SIZE) {
1441: /* nonsensical for links */
1442: status = SSH2_FX_BAD_MESSAGE;
1443: goto out;
1444: }
1445: if (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
1446: logit("set \"%s\" mode %04o", name, a.perm);
1447: r = fchmodat(AT_FDCWD, name,
1448: a.perm & 07777, AT_SYMLINK_NOFOLLOW);
1449: if (r == -1)
1450: status = errno_to_portable(errno);
1451: }
1452: if (a.flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
1453: char buf[64];
1454: time_t t = a.mtime;
1455:
1456: strftime(buf, sizeof(buf), "%Y%m%d-%H:%M:%S",
1457: localtime(&t));
1458: logit("set \"%s\" modtime %s", name, buf);
1459: r = utimensat(AT_FDCWD, name,
1460: attrib_to_ts(&a), AT_SYMLINK_NOFOLLOW);
1461: if (r == -1)
1462: status = errno_to_portable(errno);
1463: }
1464: if (a.flags & SSH2_FILEXFER_ATTR_UIDGID) {
1465: logit("set \"%s\" owner %lu group %lu", name,
1466: (u_long)a.uid, (u_long)a.gid);
1467: r = fchownat(AT_FDCWD, name, a.uid, a.gid,
1468: AT_SYMLINK_NOFOLLOW);
1469: if (r == -1)
1470: status = errno_to_portable(errno);
1471: }
1472: out:
1473: send_status(id, status);
1474: free(name);
1.122 djm 1475: }
1476:
1477: static void
1478: process_extended_limits(u_int32_t id)
1479: {
1480: struct sshbuf *msg;
1481: int r;
1482: uint64_t nfiles = 0;
1483: struct rlimit rlim;
1484:
1485: debug("request %u: limits", id);
1486:
1487: if (getrlimit(RLIMIT_NOFILE, &rlim) != -1 && rlim.rlim_cur > 5)
1488: nfiles = rlim.rlim_cur - 5; /* stdio(3) + syslog + spare */
1489:
1490: if ((msg = sshbuf_new()) == NULL)
1491: fatal_f("sshbuf_new failed");
1492: if ((r = sshbuf_put_u8(msg, SSH2_FXP_EXTENDED_REPLY)) != 0 ||
1493: (r = sshbuf_put_u32(msg, id)) != 0 ||
1494: /* max-packet-length */
1495: (r = sshbuf_put_u64(msg, SFTP_MAX_MSG_LENGTH)) != 0 ||
1496: /* max-read-length */
1497: (r = sshbuf_put_u64(msg, SFTP_MAX_READ_LENGTH)) != 0 ||
1498: /* max-write-length */
1499: (r = sshbuf_put_u64(msg, SFTP_MAX_MSG_LENGTH - 1024)) != 0 ||
1500: /* max-open-handles */
1501: (r = sshbuf_put_u64(msg, nfiles)) != 0)
1502: fatal_fr(r, "compose");
1503: send_msg(msg);
1504: sshbuf_free(msg);
1.129 djm 1505: }
1506:
1507: static void
1508: process_extended_expand(u_int32_t id)
1509: {
1510: char cwd[PATH_MAX], resolvedname[PATH_MAX];
1511: char *path, *npath;
1512: int r;
1513: Stat s;
1514:
1515: if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
1516: fatal_fr(r, "parse");
1517: if (getcwd(cwd, sizeof(cwd)) == NULL) {
1518: send_status(id, errno_to_portable(errno));
1519: goto out;
1520: }
1521:
1522: debug3("request %u: expand, original \"%s\"", id, path);
1523: if (path[0] == '\0') {
1524: /* empty path */
1525: free(path);
1526: path = xstrdup(".");
1527: } else if (*path == '~') {
1528: /* ~ expand path */
1529: /* Special-case for "~" and "~/" to respect homedir flag */
1530: if (strcmp(path, "~") == 0) {
1531: free(path);
1532: path = xstrdup(cwd);
1533: } else if (strncmp(path, "~/", 2) == 0) {
1534: npath = xstrdup(path + 2);
1535: free(path);
1536: xasprintf(&path, "%s/%s", cwd, npath);
1.130 dtucker 1537: free(npath);
1.129 djm 1538: } else {
1539: /* ~user expansions */
1540: if (tilde_expand(path, pw->pw_uid, &npath) != 0) {
1.138 djm 1541: send_status_errmsg(id,
1542: errno_to_portable(ENOENT), "no such user");
1.129 djm 1543: goto out;
1544: }
1545: free(path);
1546: path = npath;
1547: }
1548: } else if (*path != '/') {
1549: /* relative path */
1550: xasprintf(&npath, "%s/%s", cwd, path);
1551: free(path);
1552: path = npath;
1553: }
1554: verbose("expand \"%s\"", path);
1555: if (sftp_realpath(path, resolvedname) == NULL) {
1556: send_status(id, errno_to_portable(errno));
1557: goto out;
1558: }
1559: attrib_clear(&s.attrib);
1560: s.name = s.long_name = resolvedname;
1561: send_names(id, 1, &s);
1562: out:
1563: free(path);
1.140 ! djm 1564: }
! 1565:
! 1566: static void
! 1567: process_extended_copy_data(u_int32_t id)
! 1568: {
! 1569: u_char buf[64*1024];
! 1570: int read_handle, read_fd, write_handle, write_fd;
! 1571: u_int64_t len, read_off, read_len, write_off;
! 1572: int r, copy_until_eof, status = SSH2_FX_OP_UNSUPPORTED;
! 1573: size_t ret;
! 1574:
! 1575: if ((r = get_handle(iqueue, &read_handle)) != 0 ||
! 1576: (r = sshbuf_get_u64(iqueue, &read_off)) != 0 ||
! 1577: (r = sshbuf_get_u64(iqueue, &read_len)) != 0 ||
! 1578: (r = get_handle(iqueue, &write_handle)) != 0 ||
! 1579: (r = sshbuf_get_u64(iqueue, &write_off)) != 0)
! 1580: fatal("%s: buffer error: %s", __func__, ssh_err(r));
! 1581:
! 1582: debug("request %u: copy-data from \"%s\" (handle %d) off %llu len %llu "
! 1583: "to \"%s\" (handle %d) off %llu",
! 1584: id, handle_to_name(read_handle), read_handle,
! 1585: (unsigned long long)read_off, (unsigned long long)read_len,
! 1586: handle_to_name(write_handle), write_handle,
! 1587: (unsigned long long)write_off);
! 1588:
! 1589: /* For read length of 0, we read until EOF. */
! 1590: if (read_len == 0) {
! 1591: read_len = (u_int64_t)-1 - read_off;
! 1592: copy_until_eof = 1;
! 1593: } else
! 1594: copy_until_eof = 0;
! 1595:
! 1596: read_fd = handle_to_fd(read_handle);
! 1597: write_fd = handle_to_fd(write_handle);
! 1598:
! 1599: /* Disallow reading & writing to the same handle or same path or dirs */
! 1600: if (read_handle == write_handle || read_fd < 0 || write_fd < 0 ||
! 1601: !strcmp(handle_to_name(read_handle), handle_to_name(write_handle))) {
! 1602: status = SSH2_FX_FAILURE;
! 1603: goto out;
! 1604: }
! 1605:
! 1606: if (lseek(read_fd, read_off, SEEK_SET) < 0) {
! 1607: status = errno_to_portable(errno);
! 1608: error("%s: read_seek failed", __func__);
! 1609: goto out;
! 1610: }
! 1611:
! 1612: if ((handle_to_flags(write_handle) & O_APPEND) == 0 &&
! 1613: lseek(write_fd, write_off, SEEK_SET) < 0) {
! 1614: status = errno_to_portable(errno);
! 1615: error("%s: write_seek failed", __func__);
! 1616: goto out;
! 1617: }
! 1618:
! 1619: /* Process the request in chunks. */
! 1620: while (read_len > 0 || copy_until_eof) {
! 1621: len = MINIMUM(sizeof(buf), read_len);
! 1622: read_len -= len;
! 1623:
! 1624: ret = atomicio(read, read_fd, buf, len);
! 1625: if (ret == 0 && errno == EPIPE) {
! 1626: status = copy_until_eof ? SSH2_FX_OK : SSH2_FX_EOF;
! 1627: break;
! 1628: } else if (ret == 0) {
! 1629: status = errno_to_portable(errno);
! 1630: error("%s: read failed: %s", __func__, strerror(errno));
! 1631: break;
! 1632: }
! 1633: len = ret;
! 1634: handle_update_read(read_handle, len);
! 1635:
! 1636: ret = atomicio(vwrite, write_fd, buf, len);
! 1637: if (ret != len) {
! 1638: status = errno_to_portable(errno);
! 1639: error("%s: write failed: %llu != %llu: %s", __func__,
! 1640: (unsigned long long)ret, (unsigned long long)len,
! 1641: strerror(errno));
! 1642: break;
! 1643: }
! 1644: handle_update_write(write_handle, len);
! 1645: }
! 1646:
! 1647: if (read_len == 0)
! 1648: status = SSH2_FX_OK;
! 1649:
! 1650: out:
! 1651: send_status(id, status);
1.93 djm 1652: }
1653:
1654: static void
1.98 djm 1655: process_extended(u_int32_t id)
1.10 markus 1656: {
1657: char *request;
1.126 djm 1658: int r;
1.125 djm 1659: const struct sftp_handler *exthand;
1.10 markus 1660:
1.104 djm 1661: if ((r = sshbuf_get_cstring(iqueue, &request, NULL)) != 0)
1.120 djm 1662: fatal_fr(r, "parse");
1.125 djm 1663: if ((exthand = extended_handler_byname(request)) == NULL) {
1.98 djm 1664: error("Unknown extended request \"%.100s\"", request);
1.78 djm 1665: send_status(id, SSH2_FX_OP_UNSUPPORTED); /* MUST */
1.125 djm 1666: } else {
1667: if (!request_permitted(exthand))
1668: send_status(id, SSH2_FX_PERMISSION_DENIED);
1669: else
1670: exthand->handler(id);
1.98 djm 1671: }
1.97 djm 1672: free(request);
1.10 markus 1673: }
1.1 markus 1674:
1675: /* stolen from ssh-agent */
1676:
1.28 itojun 1677: static void
1.1 markus 1678: process(void)
1679: {
1.104 djm 1680: u_int msg_len;
1681: u_int buf_len;
1682: u_int consumed;
1683: u_char type;
1684: const u_char *cp;
1685: int i, r;
1.98 djm 1686: u_int32_t id;
1.1 markus 1687:
1.104 djm 1688: buf_len = sshbuf_len(iqueue);
1.34 markus 1689: if (buf_len < 5)
1.1 markus 1690: return; /* Incomplete message. */
1.104 djm 1691: cp = sshbuf_ptr(iqueue);
1.57 djm 1692: msg_len = get_u32(cp);
1.50 djm 1693: if (msg_len > SFTP_MAX_MSG_LENGTH) {
1.58 djm 1694: error("bad message from %s local user %s",
1695: client_addr, pw->pw_name);
1.76 markus 1696: sftp_server_cleanup_exit(11);
1.1 markus 1697: }
1.34 markus 1698: if (buf_len < msg_len + 4)
1.1 markus 1699: return;
1.104 djm 1700: if ((r = sshbuf_consume(iqueue, 4)) != 0)
1.120 djm 1701: fatal_fr(r, "consume");
1.34 markus 1702: buf_len -= 4;
1.104 djm 1703: if ((r = sshbuf_get_u8(iqueue, &type)) != 0)
1.120 djm 1704: fatal_fr(r, "parse type");
1.98 djm 1705:
1.1 markus 1706: switch (type) {
1.10 markus 1707: case SSH2_FXP_INIT:
1.1 markus 1708: process_init();
1.98 djm 1709: init_done = 1;
1.1 markus 1710: break;
1.10 markus 1711: case SSH2_FXP_EXTENDED:
1.98 djm 1712: if (!init_done)
1713: fatal("Received extended request before init");
1.104 djm 1714: if ((r = sshbuf_get_u32(iqueue, &id)) != 0)
1.120 djm 1715: fatal_fr(r, "parse extended ID");
1.98 djm 1716: process_extended(id);
1.10 markus 1717: break;
1.1 markus 1718: default:
1.98 djm 1719: if (!init_done)
1720: fatal("Received %u request before init", type);
1.104 djm 1721: if ((r = sshbuf_get_u32(iqueue, &id)) != 0)
1.120 djm 1722: fatal_fr(r, "parse ID");
1.98 djm 1723: for (i = 0; handlers[i].handler != NULL; i++) {
1724: if (type == handlers[i].type) {
1725: if (!request_permitted(&handlers[i])) {
1726: send_status(id,
1727: SSH2_FX_PERMISSION_DENIED);
1728: } else {
1729: handlers[i].handler(id);
1730: }
1731: break;
1732: }
1733: }
1734: if (handlers[i].handler == NULL)
1735: error("Unknown message %u", type);
1.1 markus 1736: }
1.34 markus 1737: /* discard the remaining bytes from the current packet */
1.104 djm 1738: if (buf_len < sshbuf_len(iqueue)) {
1.76 markus 1739: error("iqueue grew unexpectedly");
1740: sftp_server_cleanup_exit(255);
1741: }
1.104 djm 1742: consumed = buf_len - sshbuf_len(iqueue);
1.76 markus 1743: if (msg_len < consumed) {
1.98 djm 1744: error("msg_len %u < consumed %u", msg_len, consumed);
1.76 markus 1745: sftp_server_cleanup_exit(255);
1746: }
1.104 djm 1747: if (msg_len > consumed &&
1748: (r = sshbuf_consume(iqueue, msg_len - consumed)) != 0)
1.120 djm 1749: fatal_fr(r, "consume");
1.1 markus 1750: }
1751:
1.58 djm 1752: /* Cleanup handler that logs active handles upon normal exit */
1753: void
1.76 markus 1754: sftp_server_cleanup_exit(int i)
1.58 djm 1755: {
1756: if (pw != NULL && client_addr != NULL) {
1757: handle_log_exit();
1758: logit("session closed for local user %s from [%s]",
1759: pw->pw_name, client_addr);
1760: }
1761: _exit(i);
1762: }
1763:
1764: static void
1.76 markus 1765: sftp_server_usage(void)
1.58 djm 1766: {
1767: extern char *__progname;
1768:
1769: fprintf(stderr,
1.96 jmc 1770: "usage: %s [-ehR] [-d start_directory] [-f log_facility] "
1.118 djm 1771: "[-l log_level]\n\t[-P denied_requests] "
1772: "[-p allowed_requests] [-u umask]\n"
1.100 jmc 1773: " %s -Q protocol_feature\n",
1774: __progname, __progname);
1.58 djm 1775: exit(1);
1776: }
1777:
1.1 markus 1778: int
1.77 djm 1779: sftp_server_main(int argc, char **argv, struct passwd *user_pw)
1.1 markus 1780: {
1.132 deraadt 1781: int i, r, in, out, ch, skipargs = 0, log_stderr = 0;
1782: ssize_t len, olen;
1.58 djm 1783: SyslogFacility log_facility = SYSLOG_FACILITY_AUTH;
1.112 djm 1784: char *cp, *homedir = NULL, uidstr[32], buf[4*4096];
1.92 djm 1785: long mask;
1.58 djm 1786:
1787: extern char *optarg;
1788: extern char *__progname;
1.49 djm 1789:
1.58 djm 1790: log_init(__progname, log_level, log_facility, log_stderr);
1791:
1.95 djm 1792: pw = pwcopy(user_pw);
1793:
1.98 djm 1794: while (!skipargs && (ch = getopt(argc, argv,
1795: "d:f:l:P:p:Q:u:cehR")) != -1) {
1.58 djm 1796: switch (ch) {
1.98 djm 1797: case 'Q':
1798: if (strcasecmp(optarg, "requests") != 0) {
1799: fprintf(stderr, "Invalid query type\n");
1800: exit(1);
1801: }
1802: for (i = 0; handlers[i].handler != NULL; i++)
1803: printf("%s\n", handlers[i].name);
1804: for (i = 0; extended_handlers[i].handler != NULL; i++)
1805: printf("%s\n", extended_handlers[i].name);
1806: exit(0);
1807: break;
1.90 djm 1808: case 'R':
1809: readonly = 1;
1810: break;
1.58 djm 1811: case 'c':
1812: /*
1813: * Ignore all arguments if we are invoked as a
1.70 deraadt 1814: * shell using "sftp-server -c command"
1.58 djm 1815: */
1816: skipargs = 1;
1817: break;
1818: case 'e':
1819: log_stderr = 1;
1820: break;
1821: case 'l':
1822: log_level = log_level_number(optarg);
1823: if (log_level == SYSLOG_LEVEL_NOT_SET)
1824: error("Invalid log level \"%s\"", optarg);
1825: break;
1826: case 'f':
1827: log_facility = log_facility_number(optarg);
1.74 djm 1828: if (log_facility == SYSLOG_FACILITY_NOT_SET)
1.58 djm 1829: error("Invalid log facility \"%s\"", optarg);
1.86 djm 1830: break;
1.95 djm 1831: case 'd':
1832: cp = tilde_expand_filename(optarg, user_pw->pw_uid);
1.112 djm 1833: snprintf(uidstr, sizeof(uidstr), "%llu",
1834: (unsigned long long)pw->pw_uid);
1.95 djm 1835: homedir = percent_expand(cp, "d", user_pw->pw_dir,
1.112 djm 1836: "u", user_pw->pw_name, "U", uidstr, (char *)NULL);
1.95 djm 1837: free(cp);
1.98 djm 1838: break;
1839: case 'p':
1.118 djm 1840: if (request_allowlist != NULL)
1.98 djm 1841: fatal("Permitted requests already set");
1.118 djm 1842: request_allowlist = xstrdup(optarg);
1.98 djm 1843: break;
1844: case 'P':
1.118 djm 1845: if (request_denylist != NULL)
1.98 djm 1846: fatal("Refused requests already set");
1.118 djm 1847: request_denylist = xstrdup(optarg);
1.95 djm 1848: break;
1.86 djm 1849: case 'u':
1.92 djm 1850: errno = 0;
1851: mask = strtol(optarg, &cp, 8);
1852: if (mask < 0 || mask > 0777 || *cp != '\0' ||
1853: cp == optarg || (mask == 0 && errno != 0))
1854: fatal("Invalid umask \"%s\"", optarg);
1855: (void)umask((mode_t)mask);
1.58 djm 1856: break;
1857: case 'h':
1858: default:
1.76 markus 1859: sftp_server_usage();
1.58 djm 1860: }
1861: }
1862:
1863: log_init(__progname, log_level, log_facility, log_stderr);
1864:
1865: if ((cp = getenv("SSH_CONNECTION")) != NULL) {
1866: client_addr = xstrdup(cp);
1.76 markus 1867: if ((cp = strchr(client_addr, ' ')) == NULL) {
1868: error("Malformed SSH_CONNECTION variable: \"%s\"",
1.58 djm 1869: getenv("SSH_CONNECTION"));
1.76 markus 1870: sftp_server_cleanup_exit(255);
1871: }
1.58 djm 1872: *cp = '\0';
1873: } else
1874: client_addr = xstrdup("UNKNOWN");
1875:
1876: logit("session opened for local user %s from [%s]",
1877: pw->pw_name, client_addr);
1.10 markus 1878:
1.89 djm 1879: in = STDIN_FILENO;
1880: out = STDOUT_FILENO;
1.1 markus 1881:
1.104 djm 1882: if ((iqueue = sshbuf_new()) == NULL)
1.120 djm 1883: fatal_f("sshbuf_new failed");
1.104 djm 1884: if ((oqueue = sshbuf_new()) == NULL)
1.120 djm 1885: fatal_f("sshbuf_new failed");
1.1 markus 1886:
1.95 djm 1887: if (homedir != NULL) {
1888: if (chdir(homedir) != 0) {
1889: error("chdir to \"%s\" failed: %s", homedir,
1890: strerror(errno));
1891: }
1892: }
1.21 millert 1893:
1.1 markus 1894: for (;;) {
1.132 deraadt 1895: struct pollfd pfd[2];
1896:
1897: memset(pfd, 0, sizeof pfd);
1898: pfd[0].fd = pfd[1].fd = -1;
1.1 markus 1899:
1.73 djm 1900: /*
1901: * Ensure that we can read a full buffer and handle
1902: * the worst-case length packet it can generate,
1903: * otherwise apply backpressure by stopping reads.
1904: */
1.104 djm 1905: if ((r = sshbuf_check_reserve(iqueue, sizeof(buf))) == 0 &&
1906: (r = sshbuf_check_reserve(oqueue,
1.133 deraadt 1907: SFTP_MAX_MSG_LENGTH)) == 0) {
1.132 deraadt 1908: pfd[0].fd = in;
1.133 deraadt 1909: pfd[0].events = POLLIN;
1910: }
1.104 djm 1911: else if (r != SSH_ERR_NO_BUFFER_SPACE)
1.120 djm 1912: fatal_fr(r, "reserve");
1.73 djm 1913:
1.104 djm 1914: olen = sshbuf_len(oqueue);
1.133 deraadt 1915: if (olen > 0) {
1.132 deraadt 1916: pfd[1].fd = out;
1.133 deraadt 1917: pfd[1].events = POLLOUT;
1918: }
1.1 markus 1919:
1.132 deraadt 1920: if (poll(pfd, 2, -1) == -1) {
1.1 markus 1921: if (errno == EINTR)
1922: continue;
1.132 deraadt 1923: error("poll: %s", strerror(errno));
1.76 markus 1924: sftp_server_cleanup_exit(2);
1.1 markus 1925: }
1926:
1927: /* copy stdin to iqueue */
1.134 djm 1928: if (pfd[0].revents & (POLLIN|POLLHUP)) {
1.1 markus 1929: len = read(in, buf, sizeof buf);
1930: if (len == 0) {
1931: debug("read eof");
1.76 markus 1932: sftp_server_cleanup_exit(0);
1.116 deraadt 1933: } else if (len == -1) {
1.134 djm 1934: if (errno != EAGAIN && errno != EINTR) {
1935: error("read: %s", strerror(errno));
1936: sftp_server_cleanup_exit(1);
1937: }
1.120 djm 1938: } else if ((r = sshbuf_put(iqueue, buf, len)) != 0)
1939: fatal_fr(r, "sshbuf_put");
1.1 markus 1940: }
1941: /* send oqueue to stdout */
1.134 djm 1942: if (pfd[1].revents & (POLLOUT|POLLHUP)) {
1.104 djm 1943: len = write(out, sshbuf_ptr(oqueue), olen);
1.134 djm 1944: if (len == 0 || (len == -1 && errno == EPIPE)) {
1945: debug("write eof");
1946: sftp_server_cleanup_exit(0);
1947: } else if (len == -1) {
1.76 markus 1948: sftp_server_cleanup_exit(1);
1.134 djm 1949: if (errno != EAGAIN && errno != EINTR) {
1950: error("write: %s", strerror(errno));
1951: sftp_server_cleanup_exit(1);
1952: }
1.120 djm 1953: } else if ((r = sshbuf_consume(oqueue, len)) != 0)
1954: fatal_fr(r, "consume");
1.1 markus 1955: }
1.73 djm 1956:
1957: /*
1958: * Process requests from client if we can fit the results
1959: * into the output buffer, otherwise stop processing input
1960: * and let the output queue drain.
1961: */
1.104 djm 1962: r = sshbuf_check_reserve(oqueue, SFTP_MAX_MSG_LENGTH);
1963: if (r == 0)
1.73 djm 1964: process();
1.104 djm 1965: else if (r != SSH_ERR_NO_BUFFER_SPACE)
1.120 djm 1966: fatal_fr(r, "reserve");
1.1 markus 1967: }
1968: }
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