Annotation of src/usr.bin/ssh/sftp-server.c, Revision 1.121
1.121 ! djm 1: /* $OpenBSD: sftp-server.c,v 1.120 2020/10/18 11:32:02 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>
19: #include <sys/stat.h>
1.66 stevesk 20: #include <sys/time.h>
1.79 djm 21: #include <sys/mount.h>
22: #include <sys/statvfs.h>
1.51 stevesk 23:
24: #include <dirent.h>
1.62 stevesk 25: #include <errno.h>
1.59 stevesk 26: #include <fcntl.h>
1.68 stevesk 27: #include <stdlib.h>
1.69 stevesk 28: #include <stdio.h>
1.65 stevesk 29: #include <string.h>
1.70 deraadt 30: #include <pwd.h>
1.64 stevesk 31: #include <time.h>
1.63 stevesk 32: #include <unistd.h>
1.70 deraadt 33: #include <stdarg.h>
1.1 markus 34:
1.70 deraadt 35: #include "xmalloc.h"
1.104 djm 36: #include "sshbuf.h"
37: #include "ssherr.h"
1.14 markus 38: #include "log.h"
1.49 djm 39: #include "misc.h"
1.98 djm 40: #include "match.h"
1.58 djm 41: #include "uidswap.h"
1.1 markus 42:
1.10 markus 43: #include "sftp.h"
1.15 djm 44: #include "sftp-common.h"
1.1 markus 45:
1.117 djm 46: char *sftp_realpath(const char *, char *); /* sftp-realpath.c */
47:
1.58 djm 48: /* Our verbosity */
1.98 djm 49: static LogLevel log_level = SYSLOG_LEVEL_ERROR;
1.58 djm 50:
51: /* Our client */
1.98 djm 52: static struct passwd *pw = NULL;
53: static char *client_addr = NULL;
1.1 markus 54:
55: /* input and output queue */
1.104 djm 56: struct sshbuf *iqueue;
57: struct sshbuf *oqueue;
1.1 markus 58:
1.23 djm 59: /* Version of client */
1.98 djm 60: static u_int version;
61:
62: /* SSH2_FXP_INIT received */
63: static int init_done;
1.23 djm 64:
1.90 djm 65: /* Disable writes */
1.98 djm 66: static int readonly;
67:
68: /* Requests that are allowed/denied */
1.118 djm 69: static char *request_allowlist, *request_denylist;
1.90 djm 70:
1.43 miod 71: /* portable attributes, etc. */
1.1 markus 72: typedef struct Stat Stat;
73:
1.15 djm 74: struct Stat {
1.1 markus 75: char *name;
76: char *long_name;
77: Attrib attrib;
78: };
79:
1.98 djm 80: /* Packet handlers */
81: static void process_open(u_int32_t id);
82: static void process_close(u_int32_t id);
83: static void process_read(u_int32_t id);
84: static void process_write(u_int32_t id);
85: static void process_stat(u_int32_t id);
86: static void process_lstat(u_int32_t id);
87: static void process_fstat(u_int32_t id);
88: static void process_setstat(u_int32_t id);
89: static void process_fsetstat(u_int32_t id);
90: static void process_opendir(u_int32_t id);
91: static void process_readdir(u_int32_t id);
92: static void process_remove(u_int32_t id);
93: static void process_mkdir(u_int32_t id);
94: static void process_rmdir(u_int32_t id);
95: static void process_realpath(u_int32_t id);
96: static void process_rename(u_int32_t id);
97: static void process_readlink(u_int32_t id);
98: static void process_symlink(u_int32_t id);
99: static void process_extended_posix_rename(u_int32_t id);
100: static void process_extended_statvfs(u_int32_t id);
101: static void process_extended_fstatvfs(u_int32_t id);
102: static void process_extended_hardlink(u_int32_t id);
1.102 djm 103: static void process_extended_fsync(u_int32_t id);
1.114 djm 104: static void process_extended_lsetstat(u_int32_t id);
1.98 djm 105: static void process_extended(u_int32_t id);
106:
107: struct sftp_handler {
108: const char *name; /* user-visible name for fine-grained perms */
109: const char *ext_name; /* extended request name */
110: u_int type; /* packet type, for non extended packets */
111: void (*handler)(u_int32_t);
112: int does_write; /* if nonzero, banned for readonly mode */
113: };
114:
1.113 djm 115: static const struct sftp_handler handlers[] = {
1.98 djm 116: /* NB. SSH2_FXP_OPEN does the readonly check in the handler itself */
117: { "open", NULL, SSH2_FXP_OPEN, process_open, 0 },
118: { "close", NULL, SSH2_FXP_CLOSE, process_close, 0 },
119: { "read", NULL, SSH2_FXP_READ, process_read, 0 },
120: { "write", NULL, SSH2_FXP_WRITE, process_write, 1 },
121: { "lstat", NULL, SSH2_FXP_LSTAT, process_lstat, 0 },
122: { "fstat", NULL, SSH2_FXP_FSTAT, process_fstat, 0 },
123: { "setstat", NULL, SSH2_FXP_SETSTAT, process_setstat, 1 },
124: { "fsetstat", NULL, SSH2_FXP_FSETSTAT, process_fsetstat, 1 },
125: { "opendir", NULL, SSH2_FXP_OPENDIR, process_opendir, 0 },
126: { "readdir", NULL, SSH2_FXP_READDIR, process_readdir, 0 },
127: { "remove", NULL, SSH2_FXP_REMOVE, process_remove, 1 },
128: { "mkdir", NULL, SSH2_FXP_MKDIR, process_mkdir, 1 },
129: { "rmdir", NULL, SSH2_FXP_RMDIR, process_rmdir, 1 },
130: { "realpath", NULL, SSH2_FXP_REALPATH, process_realpath, 0 },
131: { "stat", NULL, SSH2_FXP_STAT, process_stat, 0 },
132: { "rename", NULL, SSH2_FXP_RENAME, process_rename, 1 },
133: { "readlink", NULL, SSH2_FXP_READLINK, process_readlink, 0 },
134: { "symlink", NULL, SSH2_FXP_SYMLINK, process_symlink, 1 },
135: { NULL, NULL, 0, NULL, 0 }
136: };
137:
138: /* SSH2_FXP_EXTENDED submessages */
1.113 djm 139: static const struct sftp_handler extended_handlers[] = {
1.98 djm 140: { "posix-rename", "posix-rename@openssh.com", 0,
141: process_extended_posix_rename, 1 },
142: { "statvfs", "statvfs@openssh.com", 0, process_extended_statvfs, 0 },
143: { "fstatvfs", "fstatvfs@openssh.com", 0, process_extended_fstatvfs, 0 },
144: { "hardlink", "hardlink@openssh.com", 0, process_extended_hardlink, 1 },
1.102 djm 145: { "fsync", "fsync@openssh.com", 0, process_extended_fsync, 1 },
1.114 djm 146: { "lsetstat", "lsetstat@openssh.com", 0, process_extended_lsetstat, 1 },
1.98 djm 147: { NULL, NULL, 0, NULL, 0 }
148: };
149:
150: static int
1.113 djm 151: request_permitted(const struct sftp_handler *h)
1.98 djm 152: {
153: char *result;
154:
155: if (readonly && h->does_write) {
156: verbose("Refusing %s request in read-only mode", h->name);
157: return 0;
158: }
1.118 djm 159: if (request_denylist != NULL &&
160: ((result = match_list(h->name, request_denylist, NULL))) != NULL) {
1.98 djm 161: free(result);
1.118 djm 162: verbose("Refusing denylisted %s request", h->name);
1.98 djm 163: return 0;
164: }
1.118 djm 165: if (request_allowlist != NULL &&
166: ((result = match_list(h->name, request_allowlist, NULL))) != NULL) {
1.98 djm 167: free(result);
1.118 djm 168: debug2("Permitting allowlisted %s request", h->name);
1.98 djm 169: return 1;
170: }
1.118 djm 171: if (request_allowlist != NULL) {
172: verbose("Refusing non-allowlisted %s request", h->name);
1.98 djm 173: return 0;
174: }
175: return 1;
176: }
177:
1.28 itojun 178: static int
1.2 markus 179: errno_to_portable(int unixerrno)
1.1 markus 180: {
181: int ret = 0;
1.22 deraadt 182:
1.2 markus 183: switch (unixerrno) {
1.1 markus 184: case 0:
1.10 markus 185: ret = SSH2_FX_OK;
1.1 markus 186: break;
187: case ENOENT:
188: case ENOTDIR:
189: case EBADF:
190: case ELOOP:
1.10 markus 191: ret = SSH2_FX_NO_SUCH_FILE;
1.1 markus 192: break;
193: case EPERM:
194: case EACCES:
195: case EFAULT:
1.10 markus 196: ret = SSH2_FX_PERMISSION_DENIED;
1.1 markus 197: break;
198: case ENAMETOOLONG:
199: case EINVAL:
1.10 markus 200: ret = SSH2_FX_BAD_MESSAGE;
1.82 dtucker 201: break;
202: case ENOSYS:
203: ret = SSH2_FX_OP_UNSUPPORTED;
1.1 markus 204: break;
205: default:
1.10 markus 206: ret = SSH2_FX_FAILURE;
1.1 markus 207: break;
208: }
209: return ret;
210: }
211:
1.28 itojun 212: static int
1.1 markus 213: flags_from_portable(int pflags)
214: {
215: int flags = 0;
1.22 deraadt 216:
1.20 deraadt 217: if ((pflags & SSH2_FXF_READ) &&
218: (pflags & SSH2_FXF_WRITE)) {
1.1 markus 219: flags = O_RDWR;
1.10 markus 220: } else if (pflags & SSH2_FXF_READ) {
1.1 markus 221: flags = O_RDONLY;
1.10 markus 222: } else if (pflags & SSH2_FXF_WRITE) {
1.1 markus 223: flags = O_WRONLY;
224: }
1.101 djm 225: if (pflags & SSH2_FXF_APPEND)
226: flags |= O_APPEND;
1.10 markus 227: if (pflags & SSH2_FXF_CREAT)
1.1 markus 228: flags |= O_CREAT;
1.10 markus 229: if (pflags & SSH2_FXF_TRUNC)
1.1 markus 230: flags |= O_TRUNC;
1.10 markus 231: if (pflags & SSH2_FXF_EXCL)
1.1 markus 232: flags |= O_EXCL;
233: return flags;
234: }
235:
1.58 djm 236: static const char *
237: string_from_portable(int pflags)
238: {
239: static char ret[128];
240:
241: *ret = '\0';
242:
243: #define PAPPEND(str) { \
244: if (*ret != '\0') \
245: strlcat(ret, ",", sizeof(ret)); \
1.70 deraadt 246: strlcat(ret, str, sizeof(ret)); \
1.58 djm 247: }
248:
249: if (pflags & SSH2_FXF_READ)
250: PAPPEND("READ")
251: if (pflags & SSH2_FXF_WRITE)
252: PAPPEND("WRITE")
1.101 djm 253: if (pflags & SSH2_FXF_APPEND)
254: PAPPEND("APPEND")
1.58 djm 255: if (pflags & SSH2_FXF_CREAT)
256: PAPPEND("CREATE")
257: if (pflags & SSH2_FXF_TRUNC)
258: PAPPEND("TRUNCATE")
259: if (pflags & SSH2_FXF_EXCL)
260: PAPPEND("EXCL")
261:
262: return ret;
263: }
264:
1.1 markus 265: /* handle handles */
266:
267: typedef struct Handle Handle;
268: struct Handle {
269: int use;
270: DIR *dirp;
271: int fd;
1.101 djm 272: int flags;
1.1 markus 273: char *name;
1.58 djm 274: u_int64_t bytes_read, bytes_write;
1.75 djm 275: int next_unused;
1.1 markus 276: };
1.22 deraadt 277:
1.1 markus 278: enum {
279: HANDLE_UNUSED,
280: HANDLE_DIR,
281: HANDLE_FILE
282: };
1.22 deraadt 283:
1.113 djm 284: static Handle *handles = NULL;
285: static u_int num_handles = 0;
286: static int first_unused_handle = -1;
1.75 djm 287:
288: static void handle_unused(int i)
289: {
290: handles[i].use = HANDLE_UNUSED;
291: handles[i].next_unused = first_unused_handle;
292: first_unused_handle = i;
1.1 markus 293: }
294:
1.28 itojun 295: static int
1.101 djm 296: handle_new(int use, const char *name, int fd, int flags, DIR *dirp)
1.1 markus 297: {
1.75 djm 298: int i;
299:
300: if (first_unused_handle == -1) {
301: if (num_handles + 1 <= num_handles)
302: return -1;
303: num_handles++;
1.106 deraadt 304: handles = xreallocarray(handles, num_handles, sizeof(Handle));
1.75 djm 305: handle_unused(num_handles - 1);
306: }
307:
308: i = first_unused_handle;
309: first_unused_handle = handles[i].next_unused;
310:
311: handles[i].use = use;
312: handles[i].dirp = dirp;
313: handles[i].fd = fd;
1.101 djm 314: handles[i].flags = flags;
1.75 djm 315: handles[i].name = xstrdup(name);
316: handles[i].bytes_read = handles[i].bytes_write = 0;
1.22 deraadt 317:
1.75 djm 318: return i;
1.1 markus 319: }
320:
1.28 itojun 321: static int
1.1 markus 322: handle_is_ok(int i, int type)
323: {
1.75 djm 324: return i >= 0 && (u_int)i < num_handles && handles[i].use == type;
1.1 markus 325: }
326:
1.28 itojun 327: static int
1.104 djm 328: handle_to_string(int handle, u_char **stringp, int *hlenp)
1.1 markus 329: {
330: if (stringp == NULL || hlenp == NULL)
331: return -1;
1.13 markus 332: *stringp = xmalloc(sizeof(int32_t));
1.57 djm 333: put_u32(*stringp, handle);
1.13 markus 334: *hlenp = sizeof(int32_t);
1.1 markus 335: return 0;
336: }
337:
1.28 itojun 338: static int
1.104 djm 339: handle_from_string(const u_char *handle, u_int hlen)
1.1 markus 340: {
1.13 markus 341: int val;
1.22 deraadt 342:
1.13 markus 343: if (hlen != sizeof(int32_t))
1.1 markus 344: return -1;
1.57 djm 345: val = get_u32(handle);
1.1 markus 346: if (handle_is_ok(val, HANDLE_FILE) ||
347: handle_is_ok(val, HANDLE_DIR))
348: return val;
349: return -1;
350: }
351:
1.28 itojun 352: static char *
1.1 markus 353: handle_to_name(int handle)
354: {
355: if (handle_is_ok(handle, HANDLE_DIR)||
356: handle_is_ok(handle, HANDLE_FILE))
357: return handles[handle].name;
358: return NULL;
359: }
360:
1.28 itojun 361: static DIR *
1.1 markus 362: handle_to_dir(int handle)
363: {
364: if (handle_is_ok(handle, HANDLE_DIR))
365: return handles[handle].dirp;
366: return NULL;
367: }
368:
1.28 itojun 369: static int
1.1 markus 370: handle_to_fd(int handle)
371: {
1.17 stevesk 372: if (handle_is_ok(handle, HANDLE_FILE))
1.1 markus 373: return handles[handle].fd;
374: return -1;
375: }
376:
1.101 djm 377: static int
378: handle_to_flags(int handle)
379: {
380: if (handle_is_ok(handle, HANDLE_FILE))
381: return handles[handle].flags;
382: return 0;
383: }
384:
1.58 djm 385: static void
386: handle_update_read(int handle, ssize_t bytes)
387: {
388: if (handle_is_ok(handle, HANDLE_FILE) && bytes > 0)
389: handles[handle].bytes_read += bytes;
390: }
391:
392: static void
393: handle_update_write(int handle, ssize_t bytes)
394: {
395: if (handle_is_ok(handle, HANDLE_FILE) && bytes > 0)
396: handles[handle].bytes_write += bytes;
397: }
398:
399: static u_int64_t
400: handle_bytes_read(int handle)
401: {
402: if (handle_is_ok(handle, HANDLE_FILE))
403: return (handles[handle].bytes_read);
404: return 0;
405: }
406:
407: static u_int64_t
408: handle_bytes_write(int handle)
409: {
410: if (handle_is_ok(handle, HANDLE_FILE))
411: return (handles[handle].bytes_write);
412: return 0;
413: }
414:
1.28 itojun 415: static int
1.1 markus 416: handle_close(int handle)
417: {
418: int ret = -1;
1.22 deraadt 419:
1.1 markus 420: if (handle_is_ok(handle, HANDLE_FILE)) {
421: ret = close(handles[handle].fd);
1.97 djm 422: free(handles[handle].name);
1.75 djm 423: handle_unused(handle);
1.1 markus 424: } else if (handle_is_ok(handle, HANDLE_DIR)) {
425: ret = closedir(handles[handle].dirp);
1.97 djm 426: free(handles[handle].name);
1.75 djm 427: handle_unused(handle);
1.1 markus 428: } else {
429: errno = ENOENT;
430: }
431: return ret;
432: }
433:
1.58 djm 434: static void
435: handle_log_close(int handle, char *emsg)
436: {
437: if (handle_is_ok(handle, HANDLE_FILE)) {
438: logit("%s%sclose \"%s\" bytes read %llu written %llu",
439: emsg == NULL ? "" : emsg, emsg == NULL ? "" : " ",
440: handle_to_name(handle),
1.72 stevesk 441: (unsigned long long)handle_bytes_read(handle),
442: (unsigned long long)handle_bytes_write(handle));
1.58 djm 443: } else {
444: logit("%s%sclosedir \"%s\"",
445: emsg == NULL ? "" : emsg, emsg == NULL ? "" : " ",
446: handle_to_name(handle));
447: }
448: }
449:
450: static void
451: handle_log_exit(void)
452: {
453: u_int i;
454:
1.75 djm 455: for (i = 0; i < num_handles; i++)
1.58 djm 456: if (handles[i].use != HANDLE_UNUSED)
457: handle_log_close(i, "forced");
458: }
459:
1.28 itojun 460: static int
1.104 djm 461: get_handle(struct sshbuf *queue, int *hp)
1.1 markus 462: {
1.104 djm 463: u_char *handle;
464: int r;
465: size_t hlen;
466:
467: *hp = -1;
468: if ((r = sshbuf_get_string(queue, &handle, &hlen)) != 0)
469: return r;
1.10 markus 470: if (hlen < 256)
1.104 djm 471: *hp = handle_from_string(handle, hlen);
1.97 djm 472: free(handle);
1.104 djm 473: return 0;
1.1 markus 474: }
475:
476: /* send replies */
477:
1.28 itojun 478: static void
1.104 djm 479: send_msg(struct sshbuf *m)
1.1 markus 480: {
1.104 djm 481: int r;
1.22 deraadt 482:
1.104 djm 483: if ((r = sshbuf_put_stringb(oqueue, m)) != 0)
1.120 djm 484: fatal_fr(r, "enqueue");
1.104 djm 485: sshbuf_reset(m);
1.1 markus 486: }
487:
1.58 djm 488: static const char *
489: status_to_message(u_int32_t status)
1.1 markus 490: {
1.23 djm 491: const char *status_messages[] = {
492: "Success", /* SSH_FX_OK */
493: "End of file", /* SSH_FX_EOF */
494: "No such file", /* SSH_FX_NO_SUCH_FILE */
495: "Permission denied", /* SSH_FX_PERMISSION_DENIED */
496: "Failure", /* SSH_FX_FAILURE */
497: "Bad message", /* SSH_FX_BAD_MESSAGE */
498: "No connection", /* SSH_FX_NO_CONNECTION */
499: "Connection lost", /* SSH_FX_CONNECTION_LOST */
500: "Operation unsupported", /* SSH_FX_OP_UNSUPPORTED */
501: "Unknown error" /* Others */
502: };
1.110 deraadt 503: return (status_messages[MINIMUM(status,SSH2_FX_MAX)]);
1.58 djm 504: }
1.22 deraadt 505:
1.58 djm 506: static void
507: send_status(u_int32_t id, u_int32_t status)
508: {
1.104 djm 509: struct sshbuf *msg;
510: int r;
1.58 djm 511:
512: debug3("request %u: sent status %u", id, status);
513: if (log_level > SYSLOG_LEVEL_VERBOSE ||
514: (status != SSH2_FX_OK && status != SSH2_FX_EOF))
515: logit("sent status %s", status_to_message(status));
1.104 djm 516: if ((msg = sshbuf_new()) == NULL)
1.120 djm 517: fatal_f("sshbuf_new failed");
1.104 djm 518: if ((r = sshbuf_put_u8(msg, SSH2_FXP_STATUS)) != 0 ||
519: (r = sshbuf_put_u32(msg, id)) != 0 ||
520: (r = sshbuf_put_u32(msg, status)) != 0)
1.120 djm 521: fatal_fr(r, "compose");
1.23 djm 522: if (version >= 3) {
1.104 djm 523: if ((r = sshbuf_put_cstring(msg,
524: status_to_message(status))) != 0 ||
525: (r = sshbuf_put_cstring(msg, "")) != 0)
1.120 djm 526: fatal_fr(r, "compose message");
1.23 djm 527: }
1.104 djm 528: send_msg(msg);
529: sshbuf_free(msg);
1.1 markus 530: }
1.28 itojun 531: static void
1.104 djm 532: send_data_or_handle(char type, u_int32_t id, const u_char *data, int dlen)
1.1 markus 533: {
1.104 djm 534: struct sshbuf *msg;
535: int r;
1.22 deraadt 536:
1.104 djm 537: if ((msg = sshbuf_new()) == NULL)
1.120 djm 538: fatal_f("sshbuf_new failed");
1.104 djm 539: if ((r = sshbuf_put_u8(msg, type)) != 0 ||
540: (r = sshbuf_put_u32(msg, id)) != 0 ||
541: (r = sshbuf_put_string(msg, data, dlen)) != 0)
1.120 djm 542: fatal_fr(r, "compose");
1.104 djm 543: send_msg(msg);
544: sshbuf_free(msg);
1.1 markus 545: }
546:
1.28 itojun 547: static void
1.104 djm 548: send_data(u_int32_t id, const u_char *data, int dlen)
1.1 markus 549: {
1.58 djm 550: debug("request %u: sent data len %d", id, dlen);
1.10 markus 551: send_data_or_handle(SSH2_FXP_DATA, id, data, dlen);
1.1 markus 552: }
553:
1.28 itojun 554: static void
1.1 markus 555: send_handle(u_int32_t id, int handle)
556: {
1.104 djm 557: u_char *string;
1.1 markus 558: int hlen;
1.22 deraadt 559:
1.1 markus 560: handle_to_string(handle, &string, &hlen);
1.58 djm 561: debug("request %u: sent handle handle %d", id, handle);
1.10 markus 562: send_data_or_handle(SSH2_FXP_HANDLE, id, string, hlen);
1.97 djm 563: free(string);
1.1 markus 564: }
565:
1.28 itojun 566: static void
1.44 jakob 567: send_names(u_int32_t id, int count, const Stat *stats)
1.1 markus 568: {
1.104 djm 569: struct sshbuf *msg;
570: int i, r;
1.22 deraadt 571:
1.104 djm 572: if ((msg = sshbuf_new()) == NULL)
1.120 djm 573: fatal_f("sshbuf_new failed");
1.104 djm 574: if ((r = sshbuf_put_u8(msg, SSH2_FXP_NAME)) != 0 ||
575: (r = sshbuf_put_u32(msg, id)) != 0 ||
576: (r = sshbuf_put_u32(msg, count)) != 0)
1.120 djm 577: fatal_fr(r, "compose");
1.58 djm 578: debug("request %u: sent names count %d", id, count);
1.1 markus 579: for (i = 0; i < count; i++) {
1.104 djm 580: if ((r = sshbuf_put_cstring(msg, stats[i].name)) != 0 ||
581: (r = sshbuf_put_cstring(msg, stats[i].long_name)) != 0 ||
582: (r = encode_attrib(msg, &stats[i].attrib)) != 0)
1.120 djm 583: fatal_fr(r, "compose filenames/attrib");
1.1 markus 584: }
1.104 djm 585: send_msg(msg);
586: sshbuf_free(msg);
1.1 markus 587: }
588:
1.28 itojun 589: static void
1.44 jakob 590: send_attrib(u_int32_t id, const Attrib *a)
1.1 markus 591: {
1.104 djm 592: struct sshbuf *msg;
593: int r;
1.22 deraadt 594:
1.58 djm 595: debug("request %u: sent attrib have 0x%x", id, a->flags);
1.104 djm 596: if ((msg = sshbuf_new()) == NULL)
1.120 djm 597: fatal_f("sshbuf_new failed");
1.104 djm 598: if ((r = sshbuf_put_u8(msg, SSH2_FXP_ATTRS)) != 0 ||
599: (r = sshbuf_put_u32(msg, id)) != 0 ||
600: (r = encode_attrib(msg, a)) != 0)
1.120 djm 601: fatal_fr(r, "compose");
1.104 djm 602: send_msg(msg);
603: sshbuf_free(msg);
1.1 markus 604: }
605:
1.79 djm 606: static void
607: send_statvfs(u_int32_t id, struct statvfs *st)
608: {
1.104 djm 609: struct sshbuf *msg;
1.79 djm 610: u_int64_t flag;
1.104 djm 611: int r;
1.79 djm 612:
613: flag = (st->f_flag & ST_RDONLY) ? SSH2_FXE_STATVFS_ST_RDONLY : 0;
614: flag |= (st->f_flag & ST_NOSUID) ? SSH2_FXE_STATVFS_ST_NOSUID : 0;
615:
1.104 djm 616: if ((msg = sshbuf_new()) == NULL)
1.120 djm 617: fatal_f("sshbuf_new failed");
1.104 djm 618: if ((r = sshbuf_put_u8(msg, SSH2_FXP_EXTENDED_REPLY)) != 0 ||
619: (r = sshbuf_put_u32(msg, id)) != 0 ||
620: (r = sshbuf_put_u64(msg, st->f_bsize)) != 0 ||
621: (r = sshbuf_put_u64(msg, st->f_frsize)) != 0 ||
622: (r = sshbuf_put_u64(msg, st->f_blocks)) != 0 ||
623: (r = sshbuf_put_u64(msg, st->f_bfree)) != 0 ||
624: (r = sshbuf_put_u64(msg, st->f_bavail)) != 0 ||
625: (r = sshbuf_put_u64(msg, st->f_files)) != 0 ||
626: (r = sshbuf_put_u64(msg, st->f_ffree)) != 0 ||
627: (r = sshbuf_put_u64(msg, st->f_favail)) != 0 ||
628: (r = sshbuf_put_u64(msg, st->f_fsid)) != 0 ||
629: (r = sshbuf_put_u64(msg, flag)) != 0 ||
630: (r = sshbuf_put_u64(msg, st->f_namemax)) != 0)
1.120 djm 631: fatal_fr(r, "compose");
1.104 djm 632: send_msg(msg);
633: sshbuf_free(msg);
1.79 djm 634: }
635:
1.1 markus 636: /* parse incoming */
637:
1.28 itojun 638: static void
1.1 markus 639: process_init(void)
640: {
1.104 djm 641: struct sshbuf *msg;
642: int r;
1.1 markus 643:
1.104 djm 644: if ((r = sshbuf_get_u32(iqueue, &version)) != 0)
1.120 djm 645: fatal_fr(r, "parse");
1.94 djm 646: verbose("received client version %u", version);
1.104 djm 647: if ((msg = sshbuf_new()) == NULL)
1.120 djm 648: fatal_f("sshbuf_new failed");
1.104 djm 649: if ((r = sshbuf_put_u8(msg, SSH2_FXP_VERSION)) != 0 ||
650: (r = sshbuf_put_u32(msg, SSH2_FILEXFER_VERSION)) != 0 ||
651: /* POSIX rename extension */
652: (r = sshbuf_put_cstring(msg, "posix-rename@openssh.com")) != 0 ||
653: (r = sshbuf_put_cstring(msg, "1")) != 0 || /* version */
654: /* statvfs extension */
655: (r = sshbuf_put_cstring(msg, "statvfs@openssh.com")) != 0 ||
656: (r = sshbuf_put_cstring(msg, "2")) != 0 || /* version */
657: /* fstatvfs extension */
658: (r = sshbuf_put_cstring(msg, "fstatvfs@openssh.com")) != 0 ||
659: (r = sshbuf_put_cstring(msg, "2")) != 0 || /* version */
660: /* hardlink extension */
661: (r = sshbuf_put_cstring(msg, "hardlink@openssh.com")) != 0 ||
662: (r = sshbuf_put_cstring(msg, "1")) != 0 || /* version */
663: /* fsync extension */
664: (r = sshbuf_put_cstring(msg, "fsync@openssh.com")) != 0 ||
1.114 djm 665: (r = sshbuf_put_cstring(msg, "1")) != 0 || /* version */
1.121 ! djm 666: /* lsetstat extension */
1.114 djm 667: (r = sshbuf_put_cstring(msg, "lsetstat@openssh.com")) != 0 ||
1.104 djm 668: (r = sshbuf_put_cstring(msg, "1")) != 0) /* version */
1.120 djm 669: fatal_fr(r, "compose");
1.104 djm 670: send_msg(msg);
671: sshbuf_free(msg);
1.1 markus 672: }
673:
1.28 itojun 674: static void
1.98 djm 675: process_open(u_int32_t id)
1.1 markus 676: {
1.98 djm 677: u_int32_t pflags;
1.104 djm 678: Attrib a;
1.1 markus 679: char *name;
1.104 djm 680: int r, handle, fd, flags, mode, status = SSH2_FX_FAILURE;
681:
682: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0 ||
683: (r = sshbuf_get_u32(iqueue, &pflags)) != 0 || /* portable flags */
684: (r = decode_attrib(iqueue, &a)) != 0)
1.120 djm 685: fatal_fr(r, "parse");
1.1 markus 686:
1.61 djm 687: debug3("request %u: open flags %d", id, pflags);
1.1 markus 688: flags = flags_from_portable(pflags);
1.104 djm 689: mode = (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ? a.perm : 0666;
1.58 djm 690: logit("open \"%s\" flags %s mode 0%o",
691: name, string_from_portable(pflags), mode);
1.90 djm 692: if (readonly &&
1.111 djm 693: ((flags & O_ACCMODE) != O_RDONLY ||
694: (flags & (O_CREAT|O_TRUNC)) != 0)) {
1.98 djm 695: verbose("Refusing open request in read-only mode");
1.104 djm 696: status = SSH2_FX_PERMISSION_DENIED;
1.98 djm 697: } else {
1.90 djm 698: fd = open(name, flags, mode);
1.116 deraadt 699: if (fd == -1) {
1.90 djm 700: status = errno_to_portable(errno);
1.1 markus 701: } else {
1.101 djm 702: handle = handle_new(HANDLE_FILE, name, fd, flags, NULL);
1.90 djm 703: if (handle < 0) {
704: close(fd);
705: } else {
706: send_handle(id, handle);
707: status = SSH2_FX_OK;
708: }
1.1 markus 709: }
710: }
1.10 markus 711: if (status != SSH2_FX_OK)
1.1 markus 712: send_status(id, status);
1.97 djm 713: free(name);
1.1 markus 714: }
715:
1.28 itojun 716: static void
1.98 djm 717: process_close(u_int32_t id)
1.1 markus 718: {
1.104 djm 719: int r, handle, ret, status = SSH2_FX_FAILURE;
720:
721: if ((r = get_handle(iqueue, &handle)) != 0)
1.120 djm 722: fatal_fr(r, "parse");
1.1 markus 723:
1.58 djm 724: debug3("request %u: close handle %u", id, handle);
725: handle_log_close(handle, NULL);
1.1 markus 726: ret = handle_close(handle);
1.10 markus 727: status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.1 markus 728: send_status(id, status);
729: }
730:
1.28 itojun 731: static void
1.98 djm 732: process_read(u_int32_t id)
1.1 markus 733: {
1.104 djm 734: u_char buf[64*1024];
1.98 djm 735: u_int32_t len;
1.104 djm 736: int r, handle, fd, ret, status = SSH2_FX_FAILURE;
1.1 markus 737: u_int64_t off;
738:
1.104 djm 739: if ((r = get_handle(iqueue, &handle)) != 0 ||
740: (r = sshbuf_get_u64(iqueue, &off)) != 0 ||
741: (r = sshbuf_get_u32(iqueue, &len)) != 0)
1.120 djm 742: fatal_fr(r, "parse");
1.1 markus 743:
1.58 djm 744: debug("request %u: read \"%s\" (handle %d) off %llu len %d",
745: id, handle_to_name(handle), handle, (unsigned long long)off, len);
1.1 markus 746: if (len > sizeof buf) {
747: len = sizeof buf;
1.58 djm 748: debug2("read change len %d", len);
1.1 markus 749: }
750: fd = handle_to_fd(handle);
751: if (fd >= 0) {
1.116 deraadt 752: if (lseek(fd, off, SEEK_SET) == -1) {
1.1 markus 753: error("process_read: seek failed");
754: status = errno_to_portable(errno);
755: } else {
756: ret = read(fd, buf, len);
1.116 deraadt 757: if (ret == -1) {
1.1 markus 758: status = errno_to_portable(errno);
759: } else if (ret == 0) {
1.10 markus 760: status = SSH2_FX_EOF;
1.1 markus 761: } else {
762: send_data(id, buf, ret);
1.10 markus 763: status = SSH2_FX_OK;
1.58 djm 764: handle_update_read(handle, ret);
1.1 markus 765: }
766: }
767: }
1.10 markus 768: if (status != SSH2_FX_OK)
1.1 markus 769: send_status(id, status);
770: }
771:
1.28 itojun 772: static void
1.98 djm 773: process_write(u_int32_t id)
1.1 markus 774: {
775: u_int64_t off;
1.104 djm 776: size_t len;
777: int r, handle, fd, ret, status;
778: u_char *data;
779:
780: if ((r = get_handle(iqueue, &handle)) != 0 ||
781: (r = sshbuf_get_u64(iqueue, &off)) != 0 ||
782: (r = sshbuf_get_string(iqueue, &data, &len)) != 0)
1.120 djm 783: fatal_fr(r, "parse");
1.1 markus 784:
1.104 djm 785: debug("request %u: write \"%s\" (handle %d) off %llu len %zu",
1.58 djm 786: id, handle_to_name(handle), handle, (unsigned long long)off, len);
1.1 markus 787: fd = handle_to_fd(handle);
1.104 djm 788:
1.90 djm 789: if (fd < 0)
790: status = SSH2_FX_FAILURE;
791: else {
1.101 djm 792: if (!(handle_to_flags(handle) & O_APPEND) &&
1.116 deraadt 793: lseek(fd, off, SEEK_SET) == -1) {
1.1 markus 794: status = errno_to_portable(errno);
1.120 djm 795: error_f("seek failed");
1.1 markus 796: } else {
797: /* XXX ATOMICIO ? */
798: ret = write(fd, data, len);
1.116 deraadt 799: if (ret == -1) {
1.120 djm 800: error_f("write: %s", strerror(errno));
1.1 markus 801: status = errno_to_portable(errno);
1.48 djm 802: } else if ((size_t)ret == len) {
1.10 markus 803: status = SSH2_FX_OK;
1.58 djm 804: handle_update_write(handle, ret);
1.1 markus 805: } else {
1.120 djm 806: debug2_f("nothing at all written");
1.90 djm 807: status = SSH2_FX_FAILURE;
1.1 markus 808: }
809: }
810: }
811: send_status(id, status);
1.97 djm 812: free(data);
1.1 markus 813: }
814:
1.28 itojun 815: static void
1.98 djm 816: process_do_stat(u_int32_t id, int do_lstat)
1.1 markus 817: {
1.13 markus 818: Attrib a;
1.1 markus 819: struct stat st;
820: char *name;
1.104 djm 821: int r, status = SSH2_FX_FAILURE;
822:
823: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0)
1.120 djm 824: fatal_fr(r, "parse");
1.1 markus 825:
1.58 djm 826: debug3("request %u: %sstat", id, do_lstat ? "l" : "");
827: verbose("%sstat name \"%s\"", do_lstat ? "l" : "", name);
1.104 djm 828: r = do_lstat ? lstat(name, &st) : stat(name, &st);
1.116 deraadt 829: if (r == -1) {
1.1 markus 830: status = errno_to_portable(errno);
831: } else {
1.13 markus 832: stat_to_attrib(&st, &a);
833: send_attrib(id, &a);
1.10 markus 834: status = SSH2_FX_OK;
1.1 markus 835: }
1.10 markus 836: if (status != SSH2_FX_OK)
1.1 markus 837: send_status(id, status);
1.97 djm 838: free(name);
1.1 markus 839: }
840:
1.28 itojun 841: static void
1.98 djm 842: process_stat(u_int32_t id)
1.1 markus 843: {
1.98 djm 844: process_do_stat(id, 0);
1.1 markus 845: }
846:
1.28 itojun 847: static void
1.98 djm 848: process_lstat(u_int32_t id)
1.1 markus 849: {
1.98 djm 850: process_do_stat(id, 1);
1.1 markus 851: }
852:
1.28 itojun 853: static void
1.98 djm 854: process_fstat(u_int32_t id)
1.1 markus 855: {
1.13 markus 856: Attrib a;
1.1 markus 857: struct stat st;
1.104 djm 858: int fd, r, handle, status = SSH2_FX_FAILURE;
1.1 markus 859:
1.104 djm 860: if ((r = get_handle(iqueue, &handle)) != 0)
1.120 djm 861: fatal_fr(r, "parse");
1.58 djm 862: debug("request %u: fstat \"%s\" (handle %u)",
863: id, handle_to_name(handle), handle);
1.1 markus 864: fd = handle_to_fd(handle);
1.71 stevesk 865: if (fd >= 0) {
1.104 djm 866: r = fstat(fd, &st);
1.116 deraadt 867: if (r == -1) {
1.1 markus 868: status = errno_to_portable(errno);
869: } else {
1.13 markus 870: stat_to_attrib(&st, &a);
871: send_attrib(id, &a);
1.10 markus 872: status = SSH2_FX_OK;
1.1 markus 873: }
874: }
1.10 markus 875: if (status != SSH2_FX_OK)
1.1 markus 876: send_status(id, status);
877: }
878:
1.28 itojun 879: static struct timeval *
1.44 jakob 880: attrib_to_tv(const Attrib *a)
1.1 markus 881: {
882: static struct timeval tv[2];
1.22 deraadt 883:
1.1 markus 884: tv[0].tv_sec = a->atime;
885: tv[0].tv_usec = 0;
886: tv[1].tv_sec = a->mtime;
887: tv[1].tv_usec = 0;
888: return tv;
889: }
890:
1.114 djm 891: static struct timespec *
892: attrib_to_ts(const Attrib *a)
893: {
894: static struct timespec ts[2];
895:
896: ts[0].tv_sec = a->atime;
897: ts[0].tv_nsec = 0;
898: ts[1].tv_sec = a->mtime;
899: ts[1].tv_nsec = 0;
900: return ts;
901: }
902:
1.28 itojun 903: static void
1.98 djm 904: process_setstat(u_int32_t id)
1.1 markus 905: {
1.104 djm 906: Attrib a;
1.1 markus 907: char *name;
1.104 djm 908: int r, status = SSH2_FX_OK;
909:
910: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0 ||
911: (r = decode_attrib(iqueue, &a)) != 0)
1.120 djm 912: fatal_fr(r, "parse");
1.1 markus 913:
1.58 djm 914: debug("request %u: setstat name \"%s\"", id, name);
1.104 djm 915: if (a.flags & SSH2_FILEXFER_ATTR_SIZE) {
1.72 stevesk 916: logit("set \"%s\" size %llu",
1.104 djm 917: name, (unsigned long long)a.size);
918: r = truncate(name, a.size);
919: if (r == -1)
1.33 markus 920: status = errno_to_portable(errno);
921: }
1.104 djm 922: if (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
923: logit("set \"%s\" mode %04o", name, a.perm);
924: r = chmod(name, a.perm & 07777);
925: if (r == -1)
1.1 markus 926: status = errno_to_portable(errno);
927: }
1.104 djm 928: if (a.flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
1.58 djm 929: char buf[64];
1.104 djm 930: time_t t = a.mtime;
1.58 djm 931:
932: strftime(buf, sizeof(buf), "%Y%m%d-%H:%M:%S",
933: localtime(&t));
934: logit("set \"%s\" modtime %s", name, buf);
1.104 djm 935: r = utimes(name, attrib_to_tv(&a));
936: if (r == -1)
1.1 markus 937: status = errno_to_portable(errno);
938: }
1.104 djm 939: if (a.flags & SSH2_FILEXFER_ATTR_UIDGID) {
1.58 djm 940: logit("set \"%s\" owner %lu group %lu", name,
1.104 djm 941: (u_long)a.uid, (u_long)a.gid);
942: r = chown(name, a.uid, a.gid);
943: if (r == -1)
1.18 stevesk 944: status = errno_to_portable(errno);
945: }
1.1 markus 946: send_status(id, status);
1.97 djm 947: free(name);
1.1 markus 948: }
949:
1.28 itojun 950: static void
1.98 djm 951: process_fsetstat(u_int32_t id)
1.1 markus 952: {
1.104 djm 953: Attrib a;
954: int handle, fd, r;
1.10 markus 955: int status = SSH2_FX_OK;
1.1 markus 956:
1.104 djm 957: if ((r = get_handle(iqueue, &handle)) != 0 ||
958: (r = decode_attrib(iqueue, &a)) != 0)
1.120 djm 959: fatal_fr(r, "parse");
1.104 djm 960:
1.58 djm 961: debug("request %u: fsetstat handle %d", id, handle);
1.1 markus 962: fd = handle_to_fd(handle);
1.90 djm 963: if (fd < 0)
1.10 markus 964: status = SSH2_FX_FAILURE;
1.90 djm 965: else {
1.58 djm 966: char *name = handle_to_name(handle);
967:
1.104 djm 968: if (a.flags & SSH2_FILEXFER_ATTR_SIZE) {
1.72 stevesk 969: logit("set \"%s\" size %llu",
1.104 djm 970: name, (unsigned long long)a.size);
971: r = ftruncate(fd, a.size);
972: if (r == -1)
1.33 markus 973: status = errno_to_portable(errno);
974: }
1.104 djm 975: if (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
976: logit("set \"%s\" mode %04o", name, a.perm);
977: r = fchmod(fd, a.perm & 07777);
978: if (r == -1)
1.1 markus 979: status = errno_to_portable(errno);
980: }
1.104 djm 981: if (a.flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
1.58 djm 982: char buf[64];
1.104 djm 983: time_t t = a.mtime;
1.58 djm 984:
985: strftime(buf, sizeof(buf), "%Y%m%d-%H:%M:%S",
986: localtime(&t));
987: logit("set \"%s\" modtime %s", name, buf);
1.104 djm 988: r = futimes(fd, attrib_to_tv(&a));
989: if (r == -1)
1.18 stevesk 990: status = errno_to_portable(errno);
991: }
1.104 djm 992: if (a.flags & SSH2_FILEXFER_ATTR_UIDGID) {
1.58 djm 993: logit("set \"%s\" owner %lu group %lu", name,
1.104 djm 994: (u_long)a.uid, (u_long)a.gid);
995: r = fchown(fd, a.uid, a.gid);
996: if (r == -1)
1.1 markus 997: status = errno_to_portable(errno);
998: }
999: }
1000: send_status(id, status);
1001: }
1002:
1.28 itojun 1003: static void
1.98 djm 1004: process_opendir(u_int32_t id)
1.1 markus 1005: {
1006: DIR *dirp = NULL;
1007: char *path;
1.104 djm 1008: int r, handle, status = SSH2_FX_FAILURE;
1009:
1010: if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
1.120 djm 1011: fatal_fr(r, "parse");
1.1 markus 1012:
1.58 djm 1013: debug3("request %u: opendir", id);
1014: logit("opendir \"%s\"", path);
1.17 stevesk 1015: dirp = opendir(path);
1.1 markus 1016: if (dirp == NULL) {
1017: status = errno_to_portable(errno);
1018: } else {
1.101 djm 1019: handle = handle_new(HANDLE_DIR, path, 0, 0, dirp);
1.1 markus 1020: if (handle < 0) {
1021: closedir(dirp);
1022: } else {
1023: send_handle(id, handle);
1.10 markus 1024: status = SSH2_FX_OK;
1.1 markus 1025: }
1.17 stevesk 1026:
1.1 markus 1027: }
1.10 markus 1028: if (status != SSH2_FX_OK)
1.1 markus 1029: send_status(id, status);
1.97 djm 1030: free(path);
1.1 markus 1031: }
1032:
1.28 itojun 1033: static void
1.98 djm 1034: process_readdir(u_int32_t id)
1.1 markus 1035: {
1036: DIR *dirp;
1037: struct dirent *dp;
1038: char *path;
1.104 djm 1039: int r, handle;
1040:
1041: if ((r = get_handle(iqueue, &handle)) != 0)
1.120 djm 1042: fatal_fr(r, "parse");
1.1 markus 1043:
1.58 djm 1044: debug("request %u: readdir \"%s\" (handle %d)", id,
1045: handle_to_name(handle), handle);
1.1 markus 1046: dirp = handle_to_dir(handle);
1047: path = handle_to_name(handle);
1048: if (dirp == NULL || path == NULL) {
1.10 markus 1049: send_status(id, SSH2_FX_FAILURE);
1.1 markus 1050: } else {
1051: struct stat st;
1.105 deraadt 1052: char pathname[PATH_MAX];
1.1 markus 1053: Stat *stats;
1054: int nstats = 10, count = 0, i;
1.36 deraadt 1055:
1.54 djm 1056: stats = xcalloc(nstats, sizeof(Stat));
1.1 markus 1057: while ((dp = readdir(dirp)) != NULL) {
1058: if (count >= nstats) {
1059: nstats *= 2;
1.106 deraadt 1060: stats = xreallocarray(stats, nstats, sizeof(Stat));
1.1 markus 1061: }
1062: /* XXX OVERFLOW ? */
1.30 jakob 1063: snprintf(pathname, sizeof pathname, "%s%s%s", path,
1064: strcmp(path, "/") ? "/" : "", dp->d_name);
1.116 deraadt 1065: if (lstat(pathname, &st) == -1)
1.1 markus 1066: continue;
1.13 markus 1067: stat_to_attrib(&st, &(stats[count].attrib));
1.1 markus 1068: stats[count].name = xstrdup(dp->d_name);
1.91 djm 1069: stats[count].long_name = ls_file(dp->d_name, &st, 0, 0);
1.1 markus 1070: count++;
1071: /* send up to 100 entries in one message */
1.11 markus 1072: /* XXX check packet size instead */
1.1 markus 1073: if (count == 100)
1074: break;
1075: }
1.10 markus 1076: if (count > 0) {
1077: send_names(id, count, stats);
1.31 deraadt 1078: for (i = 0; i < count; i++) {
1.97 djm 1079: free(stats[i].name);
1080: free(stats[i].long_name);
1.10 markus 1081: }
1082: } else {
1083: send_status(id, SSH2_FX_EOF);
1.1 markus 1084: }
1.97 djm 1085: free(stats);
1.1 markus 1086: }
1087: }
1088:
1.28 itojun 1089: static void
1.98 djm 1090: process_remove(u_int32_t id)
1.1 markus 1091: {
1092: char *name;
1.104 djm 1093: int r, status = SSH2_FX_FAILURE;
1094:
1095: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0)
1.120 djm 1096: fatal_fr(r, "parse");
1.1 markus 1097:
1.58 djm 1098: debug3("request %u: remove", id);
1099: logit("remove name \"%s\"", name);
1.104 djm 1100: r = unlink(name);
1101: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.1 markus 1102: send_status(id, status);
1.97 djm 1103: free(name);
1.1 markus 1104: }
1105:
1.28 itojun 1106: static void
1.98 djm 1107: process_mkdir(u_int32_t id)
1.1 markus 1108: {
1.104 djm 1109: Attrib a;
1.1 markus 1110: char *name;
1.104 djm 1111: int r, mode, status = SSH2_FX_FAILURE;
1112:
1113: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0 ||
1114: (r = decode_attrib(iqueue, &a)) != 0)
1.120 djm 1115: fatal_fr(r, "parse");
1.1 markus 1116:
1.104 djm 1117: mode = (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ?
1118: a.perm & 07777 : 0777;
1.58 djm 1119: debug3("request %u: mkdir", id);
1120: logit("mkdir name \"%s\" mode 0%o", name, mode);
1.104 djm 1121: r = mkdir(name, mode);
1122: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.1 markus 1123: send_status(id, status);
1.97 djm 1124: free(name);
1.1 markus 1125: }
1126:
1.28 itojun 1127: static void
1.98 djm 1128: process_rmdir(u_int32_t id)
1.1 markus 1129: {
1130: char *name;
1.104 djm 1131: int r, status;
1132:
1133: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0)
1.120 djm 1134: fatal_fr(r, "parse");
1.1 markus 1135:
1.58 djm 1136: debug3("request %u: rmdir", id);
1137: logit("rmdir name \"%s\"", name);
1.104 djm 1138: r = rmdir(name);
1139: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.1 markus 1140: send_status(id, status);
1.97 djm 1141: free(name);
1.1 markus 1142: }
1143:
1.28 itojun 1144: static void
1.98 djm 1145: process_realpath(u_int32_t id)
1.1 markus 1146: {
1.105 deraadt 1147: char resolvedname[PATH_MAX];
1.1 markus 1148: char *path;
1.104 djm 1149: int r;
1150:
1151: if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
1.120 djm 1152: fatal_fr(r, "parse");
1.1 markus 1153:
1.7 markus 1154: if (path[0] == '\0') {
1.97 djm 1155: free(path);
1.7 markus 1156: path = xstrdup(".");
1157: }
1.58 djm 1158: debug3("request %u: realpath", id);
1159: verbose("realpath \"%s\"", path);
1.117 djm 1160: if (sftp_realpath(path, resolvedname) == NULL) {
1.1 markus 1161: send_status(id, errno_to_portable(errno));
1162: } else {
1163: Stat s;
1164: attrib_clear(&s.attrib);
1165: s.name = s.long_name = resolvedname;
1166: send_names(id, 1, &s);
1167: }
1.97 djm 1168: free(path);
1.1 markus 1169: }
1170:
1.28 itojun 1171: static void
1.98 djm 1172: process_rename(u_int32_t id)
1.1 markus 1173: {
1174: char *oldpath, *newpath;
1.104 djm 1175: int r, status;
1.41 deraadt 1176: struct stat sb;
1.1 markus 1177:
1.104 djm 1178: if ((r = sshbuf_get_cstring(iqueue, &oldpath, NULL)) != 0 ||
1179: (r = sshbuf_get_cstring(iqueue, &newpath, NULL)) != 0)
1.120 djm 1180: fatal_fr(r, "parse");
1.104 djm 1181:
1.58 djm 1182: debug3("request %u: rename", id);
1183: logit("rename old \"%s\" new \"%s\"", oldpath, newpath);
1.41 deraadt 1184: status = SSH2_FX_FAILURE;
1.98 djm 1185: if (lstat(oldpath, &sb) == -1)
1.39 markus 1186: status = errno_to_portable(errno);
1.41 deraadt 1187: else if (S_ISREG(sb.st_mode)) {
1188: /* Race-free rename of regular files */
1.47 dtucker 1189: if (link(oldpath, newpath) == -1) {
1190: if (errno == EOPNOTSUPP) {
1191: struct stat st;
1192:
1193: /*
1194: * fs doesn't support links, so fall back to
1195: * stat+rename. This is racy.
1196: */
1197: if (stat(newpath, &st) == -1) {
1198: if (rename(oldpath, newpath) == -1)
1199: status =
1200: errno_to_portable(errno);
1201: else
1202: status = SSH2_FX_OK;
1203: }
1204: } else {
1205: status = errno_to_portable(errno);
1206: }
1207: } else if (unlink(oldpath) == -1) {
1.41 deraadt 1208: status = errno_to_portable(errno);
1209: /* clean spare link */
1210: unlink(newpath);
1211: } else
1212: status = SSH2_FX_OK;
1213: } else if (stat(newpath, &sb) == -1) {
1214: if (rename(oldpath, newpath) == -1)
1215: status = errno_to_portable(errno);
1216: else
1217: status = SSH2_FX_OK;
1218: }
1.1 markus 1219: send_status(id, status);
1.97 djm 1220: free(oldpath);
1221: free(newpath);
1.1 markus 1222: }
1223:
1.28 itojun 1224: static void
1.98 djm 1225: process_readlink(u_int32_t id)
1.23 djm 1226: {
1.104 djm 1227: int r, len;
1.105 deraadt 1228: char buf[PATH_MAX];
1.23 djm 1229: char *path;
1230:
1.104 djm 1231: if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
1.120 djm 1232: fatal_fr(r, "parse");
1.104 djm 1233:
1.58 djm 1234: debug3("request %u: readlink", id);
1235: verbose("readlink \"%s\"", path);
1.46 avsm 1236: if ((len = readlink(path, buf, sizeof(buf) - 1)) == -1)
1.23 djm 1237: send_status(id, errno_to_portable(errno));
1238: else {
1239: Stat s;
1.31 deraadt 1240:
1.46 avsm 1241: buf[len] = '\0';
1.23 djm 1242: attrib_clear(&s.attrib);
1.46 avsm 1243: s.name = s.long_name = buf;
1.23 djm 1244: send_names(id, 1, &s);
1245: }
1.97 djm 1246: free(path);
1.23 djm 1247: }
1248:
1.28 itojun 1249: static void
1.98 djm 1250: process_symlink(u_int32_t id)
1.23 djm 1251: {
1252: char *oldpath, *newpath;
1.104 djm 1253: int r, status;
1254:
1255: if ((r = sshbuf_get_cstring(iqueue, &oldpath, NULL)) != 0 ||
1256: (r = sshbuf_get_cstring(iqueue, &newpath, NULL)) != 0)
1.120 djm 1257: fatal_fr(r, "parse");
1.23 djm 1258:
1.58 djm 1259: debug3("request %u: symlink", id);
1260: logit("symlink old \"%s\" new \"%s\"", oldpath, newpath);
1.39 markus 1261: /* this will fail if 'newpath' exists */
1.104 djm 1262: r = symlink(oldpath, newpath);
1263: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.23 djm 1264: send_status(id, status);
1.97 djm 1265: free(oldpath);
1266: free(newpath);
1.23 djm 1267: }
1268:
1.28 itojun 1269: static void
1.78 djm 1270: process_extended_posix_rename(u_int32_t id)
1271: {
1272: char *oldpath, *newpath;
1.104 djm 1273: int r, status;
1274:
1275: if ((r = sshbuf_get_cstring(iqueue, &oldpath, NULL)) != 0 ||
1276: (r = sshbuf_get_cstring(iqueue, &newpath, NULL)) != 0)
1.120 djm 1277: fatal_fr(r, "parse");
1.78 djm 1278:
1279: debug3("request %u: posix-rename", id);
1280: logit("posix-rename old \"%s\" new \"%s\"", oldpath, newpath);
1.104 djm 1281: r = rename(oldpath, newpath);
1282: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.90 djm 1283: send_status(id, status);
1.97 djm 1284: free(oldpath);
1285: free(newpath);
1.78 djm 1286: }
1287:
1288: static void
1.79 djm 1289: process_extended_statvfs(u_int32_t id)
1290: {
1291: char *path;
1292: struct statvfs st;
1.104 djm 1293: int r;
1.79 djm 1294:
1.104 djm 1295: if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
1.120 djm 1296: fatal_fr(r, "parse");
1.103 dtucker 1297: debug3("request %u: statvfs", id);
1298: logit("statvfs \"%s\"", path);
1.79 djm 1299:
1300: if (statvfs(path, &st) != 0)
1301: send_status(id, errno_to_portable(errno));
1302: else
1303: send_statvfs(id, &st);
1.97 djm 1304: free(path);
1.79 djm 1305: }
1306:
1307: static void
1308: process_extended_fstatvfs(u_int32_t id)
1309: {
1.104 djm 1310: int r, handle, fd;
1.79 djm 1311: struct statvfs st;
1312:
1.104 djm 1313: if ((r = get_handle(iqueue, &handle)) != 0)
1.120 djm 1314: fatal_fr(r, "parse");
1.79 djm 1315: debug("request %u: fstatvfs \"%s\" (handle %u)",
1316: id, handle_to_name(handle), handle);
1317: if ((fd = handle_to_fd(handle)) < 0) {
1318: send_status(id, SSH2_FX_FAILURE);
1319: return;
1320: }
1321: if (fstatvfs(fd, &st) != 0)
1322: send_status(id, errno_to_portable(errno));
1323: else
1324: send_statvfs(id, &st);
1325: }
1326:
1327: static void
1.93 djm 1328: process_extended_hardlink(u_int32_t id)
1329: {
1330: char *oldpath, *newpath;
1.104 djm 1331: int r, status;
1332:
1333: if ((r = sshbuf_get_cstring(iqueue, &oldpath, NULL)) != 0 ||
1334: (r = sshbuf_get_cstring(iqueue, &newpath, NULL)) != 0)
1.120 djm 1335: fatal_fr(r, "parse");
1.93 djm 1336:
1337: debug3("request %u: hardlink", id);
1338: logit("hardlink old \"%s\" new \"%s\"", oldpath, newpath);
1.104 djm 1339: r = link(oldpath, newpath);
1340: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.93 djm 1341: send_status(id, status);
1.97 djm 1342: free(oldpath);
1343: free(newpath);
1.102 djm 1344: }
1345:
1346: static void
1347: process_extended_fsync(u_int32_t id)
1348: {
1.104 djm 1349: int handle, fd, r, status = SSH2_FX_OP_UNSUPPORTED;
1.102 djm 1350:
1.104 djm 1351: if ((r = get_handle(iqueue, &handle)) != 0)
1.120 djm 1352: fatal_fr(r, "parse");
1.102 djm 1353: debug3("request %u: fsync (handle %u)", id, handle);
1354: verbose("fsync \"%s\"", handle_to_name(handle));
1355: if ((fd = handle_to_fd(handle)) < 0)
1356: status = SSH2_FX_NO_SUCH_FILE;
1357: else if (handle_is_ok(handle, HANDLE_FILE)) {
1.104 djm 1358: r = fsync(fd);
1359: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.102 djm 1360: }
1361: send_status(id, status);
1.114 djm 1362: }
1363:
1364: static void
1365: process_extended_lsetstat(u_int32_t id)
1366: {
1367: Attrib a;
1368: char *name;
1369: int r, status = SSH2_FX_OK;
1370:
1371: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0 ||
1372: (r = decode_attrib(iqueue, &a)) != 0)
1.120 djm 1373: fatal_fr(r, "parse");
1.114 djm 1374:
1375: debug("request %u: lsetstat name \"%s\"", id, name);
1376: if (a.flags & SSH2_FILEXFER_ATTR_SIZE) {
1377: /* nonsensical for links */
1378: status = SSH2_FX_BAD_MESSAGE;
1379: goto out;
1380: }
1381: if (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
1382: logit("set \"%s\" mode %04o", name, a.perm);
1383: r = fchmodat(AT_FDCWD, name,
1384: a.perm & 07777, AT_SYMLINK_NOFOLLOW);
1385: if (r == -1)
1386: status = errno_to_portable(errno);
1387: }
1388: if (a.flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
1389: char buf[64];
1390: time_t t = a.mtime;
1391:
1392: strftime(buf, sizeof(buf), "%Y%m%d-%H:%M:%S",
1393: localtime(&t));
1394: logit("set \"%s\" modtime %s", name, buf);
1395: r = utimensat(AT_FDCWD, name,
1396: attrib_to_ts(&a), AT_SYMLINK_NOFOLLOW);
1397: if (r == -1)
1398: status = errno_to_portable(errno);
1399: }
1400: if (a.flags & SSH2_FILEXFER_ATTR_UIDGID) {
1401: logit("set \"%s\" owner %lu group %lu", name,
1402: (u_long)a.uid, (u_long)a.gid);
1403: r = fchownat(AT_FDCWD, name, a.uid, a.gid,
1404: AT_SYMLINK_NOFOLLOW);
1405: if (r == -1)
1406: status = errno_to_portable(errno);
1407: }
1408: out:
1409: send_status(id, status);
1410: free(name);
1.93 djm 1411: }
1412:
1413: static void
1.98 djm 1414: process_extended(u_int32_t id)
1.10 markus 1415: {
1416: char *request;
1.104 djm 1417: int i, r;
1.10 markus 1418:
1.104 djm 1419: if ((r = sshbuf_get_cstring(iqueue, &request, NULL)) != 0)
1.120 djm 1420: fatal_fr(r, "parse");
1.98 djm 1421: for (i = 0; extended_handlers[i].handler != NULL; i++) {
1422: if (strcmp(request, extended_handlers[i].ext_name) == 0) {
1423: if (!request_permitted(&extended_handlers[i]))
1424: send_status(id, SSH2_FX_PERMISSION_DENIED);
1425: else
1426: extended_handlers[i].handler(id);
1427: break;
1428: }
1429: }
1430: if (extended_handlers[i].handler == NULL) {
1431: error("Unknown extended request \"%.100s\"", request);
1.78 djm 1432: send_status(id, SSH2_FX_OP_UNSUPPORTED); /* MUST */
1.98 djm 1433: }
1.97 djm 1434: free(request);
1.10 markus 1435: }
1.1 markus 1436:
1437: /* stolen from ssh-agent */
1438:
1.28 itojun 1439: static void
1.1 markus 1440: process(void)
1441: {
1.104 djm 1442: u_int msg_len;
1443: u_int buf_len;
1444: u_int consumed;
1445: u_char type;
1446: const u_char *cp;
1447: int i, r;
1.98 djm 1448: u_int32_t id;
1.1 markus 1449:
1.104 djm 1450: buf_len = sshbuf_len(iqueue);
1.34 markus 1451: if (buf_len < 5)
1.1 markus 1452: return; /* Incomplete message. */
1.104 djm 1453: cp = sshbuf_ptr(iqueue);
1.57 djm 1454: msg_len = get_u32(cp);
1.50 djm 1455: if (msg_len > SFTP_MAX_MSG_LENGTH) {
1.58 djm 1456: error("bad message from %s local user %s",
1457: client_addr, pw->pw_name);
1.76 markus 1458: sftp_server_cleanup_exit(11);
1.1 markus 1459: }
1.34 markus 1460: if (buf_len < msg_len + 4)
1.1 markus 1461: return;
1.104 djm 1462: if ((r = sshbuf_consume(iqueue, 4)) != 0)
1.120 djm 1463: fatal_fr(r, "consume");
1.34 markus 1464: buf_len -= 4;
1.104 djm 1465: if ((r = sshbuf_get_u8(iqueue, &type)) != 0)
1.120 djm 1466: fatal_fr(r, "parse type");
1.98 djm 1467:
1.1 markus 1468: switch (type) {
1.10 markus 1469: case SSH2_FXP_INIT:
1.1 markus 1470: process_init();
1.98 djm 1471: init_done = 1;
1.1 markus 1472: break;
1.10 markus 1473: case SSH2_FXP_EXTENDED:
1.98 djm 1474: if (!init_done)
1475: fatal("Received extended request before init");
1.104 djm 1476: if ((r = sshbuf_get_u32(iqueue, &id)) != 0)
1.120 djm 1477: fatal_fr(r, "parse extended ID");
1.98 djm 1478: process_extended(id);
1.10 markus 1479: break;
1.1 markus 1480: default:
1.98 djm 1481: if (!init_done)
1482: fatal("Received %u request before init", type);
1.104 djm 1483: if ((r = sshbuf_get_u32(iqueue, &id)) != 0)
1.120 djm 1484: fatal_fr(r, "parse ID");
1.98 djm 1485: for (i = 0; handlers[i].handler != NULL; i++) {
1486: if (type == handlers[i].type) {
1487: if (!request_permitted(&handlers[i])) {
1488: send_status(id,
1489: SSH2_FX_PERMISSION_DENIED);
1490: } else {
1491: handlers[i].handler(id);
1492: }
1493: break;
1494: }
1495: }
1496: if (handlers[i].handler == NULL)
1497: error("Unknown message %u", type);
1.1 markus 1498: }
1.34 markus 1499: /* discard the remaining bytes from the current packet */
1.104 djm 1500: if (buf_len < sshbuf_len(iqueue)) {
1.76 markus 1501: error("iqueue grew unexpectedly");
1502: sftp_server_cleanup_exit(255);
1503: }
1.104 djm 1504: consumed = buf_len - sshbuf_len(iqueue);
1.76 markus 1505: if (msg_len < consumed) {
1.98 djm 1506: error("msg_len %u < consumed %u", msg_len, consumed);
1.76 markus 1507: sftp_server_cleanup_exit(255);
1508: }
1.104 djm 1509: if (msg_len > consumed &&
1510: (r = sshbuf_consume(iqueue, msg_len - consumed)) != 0)
1.120 djm 1511: fatal_fr(r, "consume");
1.1 markus 1512: }
1513:
1.58 djm 1514: /* Cleanup handler that logs active handles upon normal exit */
1515: void
1.76 markus 1516: sftp_server_cleanup_exit(int i)
1.58 djm 1517: {
1518: if (pw != NULL && client_addr != NULL) {
1519: handle_log_exit();
1520: logit("session closed for local user %s from [%s]",
1521: pw->pw_name, client_addr);
1522: }
1523: _exit(i);
1524: }
1525:
1526: static void
1.76 markus 1527: sftp_server_usage(void)
1.58 djm 1528: {
1529: extern char *__progname;
1530:
1531: fprintf(stderr,
1.96 jmc 1532: "usage: %s [-ehR] [-d start_directory] [-f log_facility] "
1.118 djm 1533: "[-l log_level]\n\t[-P denied_requests] "
1534: "[-p allowed_requests] [-u umask]\n"
1.100 jmc 1535: " %s -Q protocol_feature\n",
1536: __progname, __progname);
1.58 djm 1537: exit(1);
1538: }
1539:
1.1 markus 1540: int
1.77 djm 1541: sftp_server_main(int argc, char **argv, struct passwd *user_pw)
1.1 markus 1542: {
1.21 millert 1543: fd_set *rset, *wset;
1.104 djm 1544: int i, r, in, out, max, ch, skipargs = 0, log_stderr = 0;
1.21 millert 1545: ssize_t len, olen, set_size;
1.58 djm 1546: SyslogFacility log_facility = SYSLOG_FACILITY_AUTH;
1.112 djm 1547: char *cp, *homedir = NULL, uidstr[32], buf[4*4096];
1.92 djm 1548: long mask;
1.58 djm 1549:
1550: extern char *optarg;
1551: extern char *__progname;
1.49 djm 1552:
1.58 djm 1553: log_init(__progname, log_level, log_facility, log_stderr);
1554:
1.95 djm 1555: pw = pwcopy(user_pw);
1556:
1.98 djm 1557: while (!skipargs && (ch = getopt(argc, argv,
1558: "d:f:l:P:p:Q:u:cehR")) != -1) {
1.58 djm 1559: switch (ch) {
1.98 djm 1560: case 'Q':
1561: if (strcasecmp(optarg, "requests") != 0) {
1562: fprintf(stderr, "Invalid query type\n");
1563: exit(1);
1564: }
1565: for (i = 0; handlers[i].handler != NULL; i++)
1566: printf("%s\n", handlers[i].name);
1567: for (i = 0; extended_handlers[i].handler != NULL; i++)
1568: printf("%s\n", extended_handlers[i].name);
1569: exit(0);
1570: break;
1.90 djm 1571: case 'R':
1572: readonly = 1;
1573: break;
1.58 djm 1574: case 'c':
1575: /*
1576: * Ignore all arguments if we are invoked as a
1.70 deraadt 1577: * shell using "sftp-server -c command"
1.58 djm 1578: */
1579: skipargs = 1;
1580: break;
1581: case 'e':
1582: log_stderr = 1;
1583: break;
1584: case 'l':
1585: log_level = log_level_number(optarg);
1586: if (log_level == SYSLOG_LEVEL_NOT_SET)
1587: error("Invalid log level \"%s\"", optarg);
1588: break;
1589: case 'f':
1590: log_facility = log_facility_number(optarg);
1.74 djm 1591: if (log_facility == SYSLOG_FACILITY_NOT_SET)
1.58 djm 1592: error("Invalid log facility \"%s\"", optarg);
1.86 djm 1593: break;
1.95 djm 1594: case 'd':
1595: cp = tilde_expand_filename(optarg, user_pw->pw_uid);
1.112 djm 1596: snprintf(uidstr, sizeof(uidstr), "%llu",
1597: (unsigned long long)pw->pw_uid);
1.95 djm 1598: homedir = percent_expand(cp, "d", user_pw->pw_dir,
1.112 djm 1599: "u", user_pw->pw_name, "U", uidstr, (char *)NULL);
1.95 djm 1600: free(cp);
1.98 djm 1601: break;
1602: case 'p':
1.118 djm 1603: if (request_allowlist != NULL)
1.98 djm 1604: fatal("Permitted requests already set");
1.118 djm 1605: request_allowlist = xstrdup(optarg);
1.98 djm 1606: break;
1607: case 'P':
1.118 djm 1608: if (request_denylist != NULL)
1.98 djm 1609: fatal("Refused requests already set");
1.118 djm 1610: request_denylist = xstrdup(optarg);
1.95 djm 1611: break;
1.86 djm 1612: case 'u':
1.92 djm 1613: errno = 0;
1614: mask = strtol(optarg, &cp, 8);
1615: if (mask < 0 || mask > 0777 || *cp != '\0' ||
1616: cp == optarg || (mask == 0 && errno != 0))
1617: fatal("Invalid umask \"%s\"", optarg);
1618: (void)umask((mode_t)mask);
1.58 djm 1619: break;
1620: case 'h':
1621: default:
1.76 markus 1622: sftp_server_usage();
1.58 djm 1623: }
1624: }
1625:
1626: log_init(__progname, log_level, log_facility, log_stderr);
1627:
1628: if ((cp = getenv("SSH_CONNECTION")) != NULL) {
1629: client_addr = xstrdup(cp);
1.76 markus 1630: if ((cp = strchr(client_addr, ' ')) == NULL) {
1631: error("Malformed SSH_CONNECTION variable: \"%s\"",
1.58 djm 1632: getenv("SSH_CONNECTION"));
1.76 markus 1633: sftp_server_cleanup_exit(255);
1634: }
1.58 djm 1635: *cp = '\0';
1636: } else
1637: client_addr = xstrdup("UNKNOWN");
1638:
1639: logit("session opened for local user %s from [%s]",
1640: pw->pw_name, client_addr);
1.10 markus 1641:
1.89 djm 1642: in = STDIN_FILENO;
1643: out = STDOUT_FILENO;
1.1 markus 1644:
1645: max = 0;
1646: if (in > max)
1647: max = in;
1648: if (out > max)
1649: max = out;
1650:
1.104 djm 1651: if ((iqueue = sshbuf_new()) == NULL)
1.120 djm 1652: fatal_f("sshbuf_new failed");
1.104 djm 1653: if ((oqueue = sshbuf_new()) == NULL)
1.120 djm 1654: fatal_f("sshbuf_new failed");
1.1 markus 1655:
1.108 logan 1656: rset = xcalloc(howmany(max + 1, NFDBITS), sizeof(fd_mask));
1657: wset = xcalloc(howmany(max + 1, NFDBITS), sizeof(fd_mask));
1.95 djm 1658:
1659: if (homedir != NULL) {
1660: if (chdir(homedir) != 0) {
1661: error("chdir to \"%s\" failed: %s", homedir,
1662: strerror(errno));
1663: }
1664: }
1.21 millert 1665:
1.108 logan 1666: set_size = howmany(max + 1, NFDBITS) * sizeof(fd_mask);
1.1 markus 1667: for (;;) {
1.21 millert 1668: memset(rset, 0, set_size);
1669: memset(wset, 0, set_size);
1.1 markus 1670:
1.73 djm 1671: /*
1672: * Ensure that we can read a full buffer and handle
1673: * the worst-case length packet it can generate,
1674: * otherwise apply backpressure by stopping reads.
1675: */
1.104 djm 1676: if ((r = sshbuf_check_reserve(iqueue, sizeof(buf))) == 0 &&
1677: (r = sshbuf_check_reserve(oqueue,
1678: SFTP_MAX_MSG_LENGTH)) == 0)
1.73 djm 1679: FD_SET(in, rset);
1.104 djm 1680: else if (r != SSH_ERR_NO_BUFFER_SPACE)
1.120 djm 1681: fatal_fr(r, "reserve");
1.73 djm 1682:
1.104 djm 1683: olen = sshbuf_len(oqueue);
1.1 markus 1684: if (olen > 0)
1.21 millert 1685: FD_SET(out, wset);
1.1 markus 1686:
1.116 deraadt 1687: if (select(max+1, rset, wset, NULL, NULL) == -1) {
1.1 markus 1688: if (errno == EINTR)
1689: continue;
1.58 djm 1690: error("select: %s", strerror(errno));
1.76 markus 1691: sftp_server_cleanup_exit(2);
1.1 markus 1692: }
1693:
1694: /* copy stdin to iqueue */
1.21 millert 1695: if (FD_ISSET(in, rset)) {
1.1 markus 1696: len = read(in, buf, sizeof buf);
1697: if (len == 0) {
1698: debug("read eof");
1.76 markus 1699: sftp_server_cleanup_exit(0);
1.116 deraadt 1700: } else if (len == -1) {
1.58 djm 1701: error("read: %s", strerror(errno));
1.76 markus 1702: sftp_server_cleanup_exit(1);
1.120 djm 1703: } else if ((r = sshbuf_put(iqueue, buf, len)) != 0)
1704: fatal_fr(r, "sshbuf_put");
1.1 markus 1705: }
1706: /* send oqueue to stdout */
1.21 millert 1707: if (FD_ISSET(out, wset)) {
1.104 djm 1708: len = write(out, sshbuf_ptr(oqueue), olen);
1.116 deraadt 1709: if (len == -1) {
1.58 djm 1710: error("write: %s", strerror(errno));
1.76 markus 1711: sftp_server_cleanup_exit(1);
1.120 djm 1712: } else if ((r = sshbuf_consume(oqueue, len)) != 0)
1713: fatal_fr(r, "consume");
1.1 markus 1714: }
1.73 djm 1715:
1716: /*
1717: * Process requests from client if we can fit the results
1718: * into the output buffer, otherwise stop processing input
1719: * and let the output queue drain.
1720: */
1.104 djm 1721: r = sshbuf_check_reserve(oqueue, SFTP_MAX_MSG_LENGTH);
1722: if (r == 0)
1.73 djm 1723: process();
1.104 djm 1724: else if (r != SSH_ERR_NO_BUFFER_SPACE)
1.120 djm 1725: fatal_fr(r, "reserve");
1.1 markus 1726: }
1727: }
![[BACK]](/icons/back.gif){kind=icon}
Return to sftp-server.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / ssh