Annotation of src/usr.bin/ssh/sftp-server.c, Revision 1.114
1.114 ! djm 1: /* $OpenBSD: sftp-server.c,v 1.113 2019/01/01 23:10:53 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:
1.58 djm 46: /* Our verbosity */
1.98 djm 47: static LogLevel log_level = SYSLOG_LEVEL_ERROR;
1.58 djm 48:
49: /* Our client */
1.98 djm 50: static struct passwd *pw = NULL;
51: static char *client_addr = NULL;
1.1 markus 52:
53: /* input and output queue */
1.104 djm 54: struct sshbuf *iqueue;
55: struct sshbuf *oqueue;
1.1 markus 56:
1.23 djm 57: /* Version of client */
1.98 djm 58: static u_int version;
59:
60: /* SSH2_FXP_INIT received */
61: static int init_done;
1.23 djm 62:
1.90 djm 63: /* Disable writes */
1.98 djm 64: static int readonly;
65:
66: /* Requests that are allowed/denied */
67: static char *request_whitelist, *request_blacklist;
1.90 djm 68:
1.43 miod 69: /* portable attributes, etc. */
1.1 markus 70: typedef struct Stat Stat;
71:
1.15 djm 72: struct Stat {
1.1 markus 73: char *name;
74: char *long_name;
75: Attrib attrib;
76: };
77:
1.98 djm 78: /* Packet handlers */
79: static void process_open(u_int32_t id);
80: static void process_close(u_int32_t id);
81: static void process_read(u_int32_t id);
82: static void process_write(u_int32_t id);
83: static void process_stat(u_int32_t id);
84: static void process_lstat(u_int32_t id);
85: static void process_fstat(u_int32_t id);
86: static void process_setstat(u_int32_t id);
87: static void process_fsetstat(u_int32_t id);
88: static void process_opendir(u_int32_t id);
89: static void process_readdir(u_int32_t id);
90: static void process_remove(u_int32_t id);
91: static void process_mkdir(u_int32_t id);
92: static void process_rmdir(u_int32_t id);
93: static void process_realpath(u_int32_t id);
94: static void process_rename(u_int32_t id);
95: static void process_readlink(u_int32_t id);
96: static void process_symlink(u_int32_t id);
97: static void process_extended_posix_rename(u_int32_t id);
98: static void process_extended_statvfs(u_int32_t id);
99: static void process_extended_fstatvfs(u_int32_t id);
100: static void process_extended_hardlink(u_int32_t id);
1.102 djm 101: static void process_extended_fsync(u_int32_t id);
1.114 ! djm 102: static void process_extended_lsetstat(u_int32_t id);
1.98 djm 103: static void process_extended(u_int32_t id);
104:
105: struct sftp_handler {
106: const char *name; /* user-visible name for fine-grained perms */
107: const char *ext_name; /* extended request name */
108: u_int type; /* packet type, for non extended packets */
109: void (*handler)(u_int32_t);
110: int does_write; /* if nonzero, banned for readonly mode */
111: };
112:
1.113 djm 113: static const struct sftp_handler handlers[] = {
1.98 djm 114: /* NB. SSH2_FXP_OPEN does the readonly check in the handler itself */
115: { "open", NULL, SSH2_FXP_OPEN, process_open, 0 },
116: { "close", NULL, SSH2_FXP_CLOSE, process_close, 0 },
117: { "read", NULL, SSH2_FXP_READ, process_read, 0 },
118: { "write", NULL, SSH2_FXP_WRITE, process_write, 1 },
119: { "lstat", NULL, SSH2_FXP_LSTAT, process_lstat, 0 },
120: { "fstat", NULL, SSH2_FXP_FSTAT, process_fstat, 0 },
121: { "setstat", NULL, SSH2_FXP_SETSTAT, process_setstat, 1 },
122: { "fsetstat", NULL, SSH2_FXP_FSETSTAT, process_fsetstat, 1 },
123: { "opendir", NULL, SSH2_FXP_OPENDIR, process_opendir, 0 },
124: { "readdir", NULL, SSH2_FXP_READDIR, process_readdir, 0 },
125: { "remove", NULL, SSH2_FXP_REMOVE, process_remove, 1 },
126: { "mkdir", NULL, SSH2_FXP_MKDIR, process_mkdir, 1 },
127: { "rmdir", NULL, SSH2_FXP_RMDIR, process_rmdir, 1 },
128: { "realpath", NULL, SSH2_FXP_REALPATH, process_realpath, 0 },
129: { "stat", NULL, SSH2_FXP_STAT, process_stat, 0 },
130: { "rename", NULL, SSH2_FXP_RENAME, process_rename, 1 },
131: { "readlink", NULL, SSH2_FXP_READLINK, process_readlink, 0 },
132: { "symlink", NULL, SSH2_FXP_SYMLINK, process_symlink, 1 },
133: { NULL, NULL, 0, NULL, 0 }
134: };
135:
136: /* SSH2_FXP_EXTENDED submessages */
1.113 djm 137: static const struct sftp_handler extended_handlers[] = {
1.98 djm 138: { "posix-rename", "posix-rename@openssh.com", 0,
139: process_extended_posix_rename, 1 },
140: { "statvfs", "statvfs@openssh.com", 0, process_extended_statvfs, 0 },
141: { "fstatvfs", "fstatvfs@openssh.com", 0, process_extended_fstatvfs, 0 },
142: { "hardlink", "hardlink@openssh.com", 0, process_extended_hardlink, 1 },
1.102 djm 143: { "fsync", "fsync@openssh.com", 0, process_extended_fsync, 1 },
1.114 ! djm 144: { "lsetstat", "lsetstat@openssh.com", 0, process_extended_lsetstat, 1 },
1.98 djm 145: { NULL, NULL, 0, NULL, 0 }
146: };
147:
148: static int
1.113 djm 149: request_permitted(const struct sftp_handler *h)
1.98 djm 150: {
151: char *result;
152:
153: if (readonly && h->does_write) {
154: verbose("Refusing %s request in read-only mode", h->name);
155: return 0;
156: }
157: if (request_blacklist != NULL &&
158: ((result = match_list(h->name, request_blacklist, NULL))) != NULL) {
159: free(result);
160: verbose("Refusing blacklisted %s request", h->name);
161: return 0;
162: }
163: if (request_whitelist != NULL &&
164: ((result = match_list(h->name, request_whitelist, NULL))) != NULL) {
165: free(result);
166: debug2("Permitting whitelisted %s request", h->name);
167: return 1;
168: }
169: if (request_whitelist != NULL) {
170: verbose("Refusing non-whitelisted %s request", h->name);
171: return 0;
172: }
173: return 1;
174: }
175:
1.28 itojun 176: static int
1.2 markus 177: errno_to_portable(int unixerrno)
1.1 markus 178: {
179: int ret = 0;
1.22 deraadt 180:
1.2 markus 181: switch (unixerrno) {
1.1 markus 182: case 0:
1.10 markus 183: ret = SSH2_FX_OK;
1.1 markus 184: break;
185: case ENOENT:
186: case ENOTDIR:
187: case EBADF:
188: case ELOOP:
1.10 markus 189: ret = SSH2_FX_NO_SUCH_FILE;
1.1 markus 190: break;
191: case EPERM:
192: case EACCES:
193: case EFAULT:
1.10 markus 194: ret = SSH2_FX_PERMISSION_DENIED;
1.1 markus 195: break;
196: case ENAMETOOLONG:
197: case EINVAL:
1.10 markus 198: ret = SSH2_FX_BAD_MESSAGE;
1.82 dtucker 199: break;
200: case ENOSYS:
201: ret = SSH2_FX_OP_UNSUPPORTED;
1.1 markus 202: break;
203: default:
1.10 markus 204: ret = SSH2_FX_FAILURE;
1.1 markus 205: break;
206: }
207: return ret;
208: }
209:
1.28 itojun 210: static int
1.1 markus 211: flags_from_portable(int pflags)
212: {
213: int flags = 0;
1.22 deraadt 214:
1.20 deraadt 215: if ((pflags & SSH2_FXF_READ) &&
216: (pflags & SSH2_FXF_WRITE)) {
1.1 markus 217: flags = O_RDWR;
1.10 markus 218: } else if (pflags & SSH2_FXF_READ) {
1.1 markus 219: flags = O_RDONLY;
1.10 markus 220: } else if (pflags & SSH2_FXF_WRITE) {
1.1 markus 221: flags = O_WRONLY;
222: }
1.101 djm 223: if (pflags & SSH2_FXF_APPEND)
224: flags |= O_APPEND;
1.10 markus 225: if (pflags & SSH2_FXF_CREAT)
1.1 markus 226: flags |= O_CREAT;
1.10 markus 227: if (pflags & SSH2_FXF_TRUNC)
1.1 markus 228: flags |= O_TRUNC;
1.10 markus 229: if (pflags & SSH2_FXF_EXCL)
1.1 markus 230: flags |= O_EXCL;
231: return flags;
232: }
233:
1.58 djm 234: static const char *
235: string_from_portable(int pflags)
236: {
237: static char ret[128];
238:
239: *ret = '\0';
240:
241: #define PAPPEND(str) { \
242: if (*ret != '\0') \
243: strlcat(ret, ",", sizeof(ret)); \
1.70 deraadt 244: strlcat(ret, str, sizeof(ret)); \
1.58 djm 245: }
246:
247: if (pflags & SSH2_FXF_READ)
248: PAPPEND("READ")
249: if (pflags & SSH2_FXF_WRITE)
250: PAPPEND("WRITE")
1.101 djm 251: if (pflags & SSH2_FXF_APPEND)
252: PAPPEND("APPEND")
1.58 djm 253: if (pflags & SSH2_FXF_CREAT)
254: PAPPEND("CREATE")
255: if (pflags & SSH2_FXF_TRUNC)
256: PAPPEND("TRUNCATE")
257: if (pflags & SSH2_FXF_EXCL)
258: PAPPEND("EXCL")
259:
260: return ret;
261: }
262:
1.1 markus 263: /* handle handles */
264:
265: typedef struct Handle Handle;
266: struct Handle {
267: int use;
268: DIR *dirp;
269: int fd;
1.101 djm 270: int flags;
1.1 markus 271: char *name;
1.58 djm 272: u_int64_t bytes_read, bytes_write;
1.75 djm 273: int next_unused;
1.1 markus 274: };
1.22 deraadt 275:
1.1 markus 276: enum {
277: HANDLE_UNUSED,
278: HANDLE_DIR,
279: HANDLE_FILE
280: };
1.22 deraadt 281:
1.113 djm 282: static Handle *handles = NULL;
283: static u_int num_handles = 0;
284: static int first_unused_handle = -1;
1.75 djm 285:
286: static void handle_unused(int i)
287: {
288: handles[i].use = HANDLE_UNUSED;
289: handles[i].next_unused = first_unused_handle;
290: first_unused_handle = i;
1.1 markus 291: }
292:
1.28 itojun 293: static int
1.101 djm 294: handle_new(int use, const char *name, int fd, int flags, DIR *dirp)
1.1 markus 295: {
1.75 djm 296: int i;
297:
298: if (first_unused_handle == -1) {
299: if (num_handles + 1 <= num_handles)
300: return -1;
301: num_handles++;
1.106 deraadt 302: handles = xreallocarray(handles, num_handles, sizeof(Handle));
1.75 djm 303: handle_unused(num_handles - 1);
304: }
305:
306: i = first_unused_handle;
307: first_unused_handle = handles[i].next_unused;
308:
309: handles[i].use = use;
310: handles[i].dirp = dirp;
311: handles[i].fd = fd;
1.101 djm 312: handles[i].flags = flags;
1.75 djm 313: handles[i].name = xstrdup(name);
314: handles[i].bytes_read = handles[i].bytes_write = 0;
1.22 deraadt 315:
1.75 djm 316: return i;
1.1 markus 317: }
318:
1.28 itojun 319: static int
1.1 markus 320: handle_is_ok(int i, int type)
321: {
1.75 djm 322: return i >= 0 && (u_int)i < num_handles && handles[i].use == type;
1.1 markus 323: }
324:
1.28 itojun 325: static int
1.104 djm 326: handle_to_string(int handle, u_char **stringp, int *hlenp)
1.1 markus 327: {
328: if (stringp == NULL || hlenp == NULL)
329: return -1;
1.13 markus 330: *stringp = xmalloc(sizeof(int32_t));
1.57 djm 331: put_u32(*stringp, handle);
1.13 markus 332: *hlenp = sizeof(int32_t);
1.1 markus 333: return 0;
334: }
335:
1.28 itojun 336: static int
1.104 djm 337: handle_from_string(const u_char *handle, u_int hlen)
1.1 markus 338: {
1.13 markus 339: int val;
1.22 deraadt 340:
1.13 markus 341: if (hlen != sizeof(int32_t))
1.1 markus 342: return -1;
1.57 djm 343: val = get_u32(handle);
1.1 markus 344: if (handle_is_ok(val, HANDLE_FILE) ||
345: handle_is_ok(val, HANDLE_DIR))
346: return val;
347: return -1;
348: }
349:
1.28 itojun 350: static char *
1.1 markus 351: handle_to_name(int handle)
352: {
353: if (handle_is_ok(handle, HANDLE_DIR)||
354: handle_is_ok(handle, HANDLE_FILE))
355: return handles[handle].name;
356: return NULL;
357: }
358:
1.28 itojun 359: static DIR *
1.1 markus 360: handle_to_dir(int handle)
361: {
362: if (handle_is_ok(handle, HANDLE_DIR))
363: return handles[handle].dirp;
364: return NULL;
365: }
366:
1.28 itojun 367: static int
1.1 markus 368: handle_to_fd(int handle)
369: {
1.17 stevesk 370: if (handle_is_ok(handle, HANDLE_FILE))
1.1 markus 371: return handles[handle].fd;
372: return -1;
373: }
374:
1.101 djm 375: static int
376: handle_to_flags(int handle)
377: {
378: if (handle_is_ok(handle, HANDLE_FILE))
379: return handles[handle].flags;
380: return 0;
381: }
382:
1.58 djm 383: static void
384: handle_update_read(int handle, ssize_t bytes)
385: {
386: if (handle_is_ok(handle, HANDLE_FILE) && bytes > 0)
387: handles[handle].bytes_read += bytes;
388: }
389:
390: static void
391: handle_update_write(int handle, ssize_t bytes)
392: {
393: if (handle_is_ok(handle, HANDLE_FILE) && bytes > 0)
394: handles[handle].bytes_write += bytes;
395: }
396:
397: static u_int64_t
398: handle_bytes_read(int handle)
399: {
400: if (handle_is_ok(handle, HANDLE_FILE))
401: return (handles[handle].bytes_read);
402: return 0;
403: }
404:
405: static u_int64_t
406: handle_bytes_write(int handle)
407: {
408: if (handle_is_ok(handle, HANDLE_FILE))
409: return (handles[handle].bytes_write);
410: return 0;
411: }
412:
1.28 itojun 413: static int
1.1 markus 414: handle_close(int handle)
415: {
416: int ret = -1;
1.22 deraadt 417:
1.1 markus 418: if (handle_is_ok(handle, HANDLE_FILE)) {
419: ret = close(handles[handle].fd);
1.97 djm 420: free(handles[handle].name);
1.75 djm 421: handle_unused(handle);
1.1 markus 422: } else if (handle_is_ok(handle, HANDLE_DIR)) {
423: ret = closedir(handles[handle].dirp);
1.97 djm 424: free(handles[handle].name);
1.75 djm 425: handle_unused(handle);
1.1 markus 426: } else {
427: errno = ENOENT;
428: }
429: return ret;
430: }
431:
1.58 djm 432: static void
433: handle_log_close(int handle, char *emsg)
434: {
435: if (handle_is_ok(handle, HANDLE_FILE)) {
436: logit("%s%sclose \"%s\" bytes read %llu written %llu",
437: emsg == NULL ? "" : emsg, emsg == NULL ? "" : " ",
438: handle_to_name(handle),
1.72 stevesk 439: (unsigned long long)handle_bytes_read(handle),
440: (unsigned long long)handle_bytes_write(handle));
1.58 djm 441: } else {
442: logit("%s%sclosedir \"%s\"",
443: emsg == NULL ? "" : emsg, emsg == NULL ? "" : " ",
444: handle_to_name(handle));
445: }
446: }
447:
448: static void
449: handle_log_exit(void)
450: {
451: u_int i;
452:
1.75 djm 453: for (i = 0; i < num_handles; i++)
1.58 djm 454: if (handles[i].use != HANDLE_UNUSED)
455: handle_log_close(i, "forced");
456: }
457:
1.28 itojun 458: static int
1.104 djm 459: get_handle(struct sshbuf *queue, int *hp)
1.1 markus 460: {
1.104 djm 461: u_char *handle;
462: int r;
463: size_t hlen;
464:
465: *hp = -1;
466: if ((r = sshbuf_get_string(queue, &handle, &hlen)) != 0)
467: return r;
1.10 markus 468: if (hlen < 256)
1.104 djm 469: *hp = handle_from_string(handle, hlen);
1.97 djm 470: free(handle);
1.104 djm 471: return 0;
1.1 markus 472: }
473:
474: /* send replies */
475:
1.28 itojun 476: static void
1.104 djm 477: send_msg(struct sshbuf *m)
1.1 markus 478: {
1.104 djm 479: int r;
1.22 deraadt 480:
1.104 djm 481: if ((r = sshbuf_put_stringb(oqueue, m)) != 0)
482: fatal("%s: buffer error: %s", __func__, ssh_err(r));
483: sshbuf_reset(m);
1.1 markus 484: }
485:
1.58 djm 486: static const char *
487: status_to_message(u_int32_t status)
1.1 markus 488: {
1.23 djm 489: const char *status_messages[] = {
490: "Success", /* SSH_FX_OK */
491: "End of file", /* SSH_FX_EOF */
492: "No such file", /* SSH_FX_NO_SUCH_FILE */
493: "Permission denied", /* SSH_FX_PERMISSION_DENIED */
494: "Failure", /* SSH_FX_FAILURE */
495: "Bad message", /* SSH_FX_BAD_MESSAGE */
496: "No connection", /* SSH_FX_NO_CONNECTION */
497: "Connection lost", /* SSH_FX_CONNECTION_LOST */
498: "Operation unsupported", /* SSH_FX_OP_UNSUPPORTED */
499: "Unknown error" /* Others */
500: };
1.110 deraadt 501: return (status_messages[MINIMUM(status,SSH2_FX_MAX)]);
1.58 djm 502: }
1.22 deraadt 503:
1.58 djm 504: static void
505: send_status(u_int32_t id, u_int32_t status)
506: {
1.104 djm 507: struct sshbuf *msg;
508: int r;
1.58 djm 509:
510: debug3("request %u: sent status %u", id, status);
511: if (log_level > SYSLOG_LEVEL_VERBOSE ||
512: (status != SSH2_FX_OK && status != SSH2_FX_EOF))
513: logit("sent status %s", status_to_message(status));
1.104 djm 514: if ((msg = sshbuf_new()) == NULL)
515: fatal("%s: sshbuf_new failed", __func__);
516: if ((r = sshbuf_put_u8(msg, SSH2_FXP_STATUS)) != 0 ||
517: (r = sshbuf_put_u32(msg, id)) != 0 ||
518: (r = sshbuf_put_u32(msg, status)) != 0)
519: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.23 djm 520: if (version >= 3) {
1.104 djm 521: if ((r = sshbuf_put_cstring(msg,
522: status_to_message(status))) != 0 ||
523: (r = sshbuf_put_cstring(msg, "")) != 0)
524: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.23 djm 525: }
1.104 djm 526: send_msg(msg);
527: sshbuf_free(msg);
1.1 markus 528: }
1.28 itojun 529: static void
1.104 djm 530: send_data_or_handle(char type, u_int32_t id, const u_char *data, int dlen)
1.1 markus 531: {
1.104 djm 532: struct sshbuf *msg;
533: int r;
1.22 deraadt 534:
1.104 djm 535: if ((msg = sshbuf_new()) == NULL)
536: fatal("%s: sshbuf_new failed", __func__);
537: if ((r = sshbuf_put_u8(msg, type)) != 0 ||
538: (r = sshbuf_put_u32(msg, id)) != 0 ||
539: (r = sshbuf_put_string(msg, data, dlen)) != 0)
540: fatal("%s: buffer error: %s", __func__, ssh_err(r));
541: send_msg(msg);
542: sshbuf_free(msg);
1.1 markus 543: }
544:
1.28 itojun 545: static void
1.104 djm 546: send_data(u_int32_t id, const u_char *data, int dlen)
1.1 markus 547: {
1.58 djm 548: debug("request %u: sent data len %d", id, dlen);
1.10 markus 549: send_data_or_handle(SSH2_FXP_DATA, id, data, dlen);
1.1 markus 550: }
551:
1.28 itojun 552: static void
1.1 markus 553: send_handle(u_int32_t id, int handle)
554: {
1.104 djm 555: u_char *string;
1.1 markus 556: int hlen;
1.22 deraadt 557:
1.1 markus 558: handle_to_string(handle, &string, &hlen);
1.58 djm 559: debug("request %u: sent handle handle %d", id, handle);
1.10 markus 560: send_data_or_handle(SSH2_FXP_HANDLE, id, string, hlen);
1.97 djm 561: free(string);
1.1 markus 562: }
563:
1.28 itojun 564: static void
1.44 jakob 565: send_names(u_int32_t id, int count, const Stat *stats)
1.1 markus 566: {
1.104 djm 567: struct sshbuf *msg;
568: int i, r;
1.22 deraadt 569:
1.104 djm 570: if ((msg = sshbuf_new()) == NULL)
571: fatal("%s: sshbuf_new failed", __func__);
572: if ((r = sshbuf_put_u8(msg, SSH2_FXP_NAME)) != 0 ||
573: (r = sshbuf_put_u32(msg, id)) != 0 ||
574: (r = sshbuf_put_u32(msg, count)) != 0)
575: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.58 djm 576: debug("request %u: sent names count %d", id, count);
1.1 markus 577: for (i = 0; i < count; i++) {
1.104 djm 578: if ((r = sshbuf_put_cstring(msg, stats[i].name)) != 0 ||
579: (r = sshbuf_put_cstring(msg, stats[i].long_name)) != 0 ||
580: (r = encode_attrib(msg, &stats[i].attrib)) != 0)
581: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 markus 582: }
1.104 djm 583: send_msg(msg);
584: sshbuf_free(msg);
1.1 markus 585: }
586:
1.28 itojun 587: static void
1.44 jakob 588: send_attrib(u_int32_t id, const Attrib *a)
1.1 markus 589: {
1.104 djm 590: struct sshbuf *msg;
591: int r;
1.22 deraadt 592:
1.58 djm 593: debug("request %u: sent attrib have 0x%x", id, a->flags);
1.104 djm 594: if ((msg = sshbuf_new()) == NULL)
595: fatal("%s: sshbuf_new failed", __func__);
596: if ((r = sshbuf_put_u8(msg, SSH2_FXP_ATTRS)) != 0 ||
597: (r = sshbuf_put_u32(msg, id)) != 0 ||
598: (r = encode_attrib(msg, a)) != 0)
599: fatal("%s: buffer error: %s", __func__, ssh_err(r));
600: send_msg(msg);
601: sshbuf_free(msg);
1.1 markus 602: }
603:
1.79 djm 604: static void
605: send_statvfs(u_int32_t id, struct statvfs *st)
606: {
1.104 djm 607: struct sshbuf *msg;
1.79 djm 608: u_int64_t flag;
1.104 djm 609: int r;
1.79 djm 610:
611: flag = (st->f_flag & ST_RDONLY) ? SSH2_FXE_STATVFS_ST_RDONLY : 0;
612: flag |= (st->f_flag & ST_NOSUID) ? SSH2_FXE_STATVFS_ST_NOSUID : 0;
613:
1.104 djm 614: if ((msg = sshbuf_new()) == NULL)
615: fatal("%s: sshbuf_new failed", __func__);
616: if ((r = sshbuf_put_u8(msg, SSH2_FXP_EXTENDED_REPLY)) != 0 ||
617: (r = sshbuf_put_u32(msg, id)) != 0 ||
618: (r = sshbuf_put_u64(msg, st->f_bsize)) != 0 ||
619: (r = sshbuf_put_u64(msg, st->f_frsize)) != 0 ||
620: (r = sshbuf_put_u64(msg, st->f_blocks)) != 0 ||
621: (r = sshbuf_put_u64(msg, st->f_bfree)) != 0 ||
622: (r = sshbuf_put_u64(msg, st->f_bavail)) != 0 ||
623: (r = sshbuf_put_u64(msg, st->f_files)) != 0 ||
624: (r = sshbuf_put_u64(msg, st->f_ffree)) != 0 ||
625: (r = sshbuf_put_u64(msg, st->f_favail)) != 0 ||
626: (r = sshbuf_put_u64(msg, st->f_fsid)) != 0 ||
627: (r = sshbuf_put_u64(msg, flag)) != 0 ||
628: (r = sshbuf_put_u64(msg, st->f_namemax)) != 0)
629: fatal("%s: buffer error: %s", __func__, ssh_err(r));
630: send_msg(msg);
631: sshbuf_free(msg);
1.79 djm 632: }
633:
1.1 markus 634: /* parse incoming */
635:
1.28 itojun 636: static void
1.1 markus 637: process_init(void)
638: {
1.104 djm 639: struct sshbuf *msg;
640: int r;
1.1 markus 641:
1.104 djm 642: if ((r = sshbuf_get_u32(iqueue, &version)) != 0)
643: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.94 djm 644: verbose("received client version %u", version);
1.104 djm 645: if ((msg = sshbuf_new()) == NULL)
646: fatal("%s: sshbuf_new failed", __func__);
647: if ((r = sshbuf_put_u8(msg, SSH2_FXP_VERSION)) != 0 ||
648: (r = sshbuf_put_u32(msg, SSH2_FILEXFER_VERSION)) != 0 ||
649: /* POSIX rename extension */
650: (r = sshbuf_put_cstring(msg, "posix-rename@openssh.com")) != 0 ||
651: (r = sshbuf_put_cstring(msg, "1")) != 0 || /* version */
652: /* statvfs extension */
653: (r = sshbuf_put_cstring(msg, "statvfs@openssh.com")) != 0 ||
654: (r = sshbuf_put_cstring(msg, "2")) != 0 || /* version */
655: /* fstatvfs extension */
656: (r = sshbuf_put_cstring(msg, "fstatvfs@openssh.com")) != 0 ||
657: (r = sshbuf_put_cstring(msg, "2")) != 0 || /* version */
658: /* hardlink extension */
659: (r = sshbuf_put_cstring(msg, "hardlink@openssh.com")) != 0 ||
660: (r = sshbuf_put_cstring(msg, "1")) != 0 || /* version */
661: /* fsync extension */
662: (r = sshbuf_put_cstring(msg, "fsync@openssh.com")) != 0 ||
1.114 ! djm 663: (r = sshbuf_put_cstring(msg, "1")) != 0 || /* version */
! 664: (r = sshbuf_put_cstring(msg, "lsetstat@openssh.com")) != 0 ||
1.104 djm 665: (r = sshbuf_put_cstring(msg, "1")) != 0) /* version */
666: fatal("%s: buffer error: %s", __func__, ssh_err(r));
667: send_msg(msg);
668: sshbuf_free(msg);
1.1 markus 669: }
670:
1.28 itojun 671: static void
1.98 djm 672: process_open(u_int32_t id)
1.1 markus 673: {
1.98 djm 674: u_int32_t pflags;
1.104 djm 675: Attrib a;
1.1 markus 676: char *name;
1.104 djm 677: int r, handle, fd, flags, mode, status = SSH2_FX_FAILURE;
678:
679: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0 ||
680: (r = sshbuf_get_u32(iqueue, &pflags)) != 0 || /* portable flags */
681: (r = decode_attrib(iqueue, &a)) != 0)
682: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 markus 683:
1.61 djm 684: debug3("request %u: open flags %d", id, pflags);
1.1 markus 685: flags = flags_from_portable(pflags);
1.104 djm 686: mode = (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ? a.perm : 0666;
1.58 djm 687: logit("open \"%s\" flags %s mode 0%o",
688: name, string_from_portable(pflags), mode);
1.90 djm 689: if (readonly &&
1.111 djm 690: ((flags & O_ACCMODE) != O_RDONLY ||
691: (flags & (O_CREAT|O_TRUNC)) != 0)) {
1.98 djm 692: verbose("Refusing open request in read-only mode");
1.104 djm 693: status = SSH2_FX_PERMISSION_DENIED;
1.98 djm 694: } else {
1.90 djm 695: fd = open(name, flags, mode);
696: if (fd < 0) {
697: status = errno_to_portable(errno);
1.1 markus 698: } else {
1.101 djm 699: handle = handle_new(HANDLE_FILE, name, fd, flags, NULL);
1.90 djm 700: if (handle < 0) {
701: close(fd);
702: } else {
703: send_handle(id, handle);
704: status = SSH2_FX_OK;
705: }
1.1 markus 706: }
707: }
1.10 markus 708: if (status != SSH2_FX_OK)
1.1 markus 709: send_status(id, status);
1.97 djm 710: free(name);
1.1 markus 711: }
712:
1.28 itojun 713: static void
1.98 djm 714: process_close(u_int32_t id)
1.1 markus 715: {
1.104 djm 716: int r, handle, ret, status = SSH2_FX_FAILURE;
717:
718: if ((r = get_handle(iqueue, &handle)) != 0)
719: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 markus 720:
1.58 djm 721: debug3("request %u: close handle %u", id, handle);
722: handle_log_close(handle, NULL);
1.1 markus 723: ret = handle_close(handle);
1.10 markus 724: status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.1 markus 725: send_status(id, status);
726: }
727:
1.28 itojun 728: static void
1.98 djm 729: process_read(u_int32_t id)
1.1 markus 730: {
1.104 djm 731: u_char buf[64*1024];
1.98 djm 732: u_int32_t len;
1.104 djm 733: int r, handle, fd, ret, status = SSH2_FX_FAILURE;
1.1 markus 734: u_int64_t off;
735:
1.104 djm 736: if ((r = get_handle(iqueue, &handle)) != 0 ||
737: (r = sshbuf_get_u64(iqueue, &off)) != 0 ||
738: (r = sshbuf_get_u32(iqueue, &len)) != 0)
739: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 markus 740:
1.58 djm 741: debug("request %u: read \"%s\" (handle %d) off %llu len %d",
742: id, handle_to_name(handle), handle, (unsigned long long)off, len);
1.1 markus 743: if (len > sizeof buf) {
744: len = sizeof buf;
1.58 djm 745: debug2("read change len %d", len);
1.1 markus 746: }
747: fd = handle_to_fd(handle);
748: if (fd >= 0) {
749: if (lseek(fd, off, SEEK_SET) < 0) {
750: error("process_read: seek failed");
751: status = errno_to_portable(errno);
752: } else {
753: ret = read(fd, buf, len);
754: if (ret < 0) {
755: status = errno_to_portable(errno);
756: } else if (ret == 0) {
1.10 markus 757: status = SSH2_FX_EOF;
1.1 markus 758: } else {
759: send_data(id, buf, ret);
1.10 markus 760: status = SSH2_FX_OK;
1.58 djm 761: handle_update_read(handle, ret);
1.1 markus 762: }
763: }
764: }
1.10 markus 765: if (status != SSH2_FX_OK)
1.1 markus 766: send_status(id, status);
767: }
768:
1.28 itojun 769: static void
1.98 djm 770: process_write(u_int32_t id)
1.1 markus 771: {
772: u_int64_t off;
1.104 djm 773: size_t len;
774: int r, handle, fd, ret, status;
775: u_char *data;
776:
777: if ((r = get_handle(iqueue, &handle)) != 0 ||
778: (r = sshbuf_get_u64(iqueue, &off)) != 0 ||
779: (r = sshbuf_get_string(iqueue, &data, &len)) != 0)
780: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 markus 781:
1.104 djm 782: debug("request %u: write \"%s\" (handle %d) off %llu len %zu",
1.58 djm 783: id, handle_to_name(handle), handle, (unsigned long long)off, len);
1.1 markus 784: fd = handle_to_fd(handle);
1.104 djm 785:
1.90 djm 786: if (fd < 0)
787: status = SSH2_FX_FAILURE;
788: else {
1.101 djm 789: if (!(handle_to_flags(handle) & O_APPEND) &&
790: lseek(fd, off, SEEK_SET) < 0) {
1.1 markus 791: status = errno_to_portable(errno);
792: error("process_write: seek failed");
793: } else {
794: /* XXX ATOMICIO ? */
795: ret = write(fd, data, len);
1.48 djm 796: if (ret < 0) {
1.1 markus 797: error("process_write: write failed");
798: status = errno_to_portable(errno);
1.48 djm 799: } else if ((size_t)ret == len) {
1.10 markus 800: status = SSH2_FX_OK;
1.58 djm 801: handle_update_write(handle, ret);
1.1 markus 802: } else {
1.58 djm 803: debug2("nothing at all written");
1.90 djm 804: status = SSH2_FX_FAILURE;
1.1 markus 805: }
806: }
807: }
808: send_status(id, status);
1.97 djm 809: free(data);
1.1 markus 810: }
811:
1.28 itojun 812: static void
1.98 djm 813: process_do_stat(u_int32_t id, int do_lstat)
1.1 markus 814: {
1.13 markus 815: Attrib a;
1.1 markus 816: struct stat st;
817: char *name;
1.104 djm 818: int r, status = SSH2_FX_FAILURE;
819:
820: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0)
821: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 markus 822:
1.58 djm 823: debug3("request %u: %sstat", id, do_lstat ? "l" : "");
824: verbose("%sstat name \"%s\"", do_lstat ? "l" : "", name);
1.104 djm 825: r = do_lstat ? lstat(name, &st) : stat(name, &st);
826: if (r < 0) {
1.1 markus 827: status = errno_to_portable(errno);
828: } else {
1.13 markus 829: stat_to_attrib(&st, &a);
830: send_attrib(id, &a);
1.10 markus 831: status = SSH2_FX_OK;
1.1 markus 832: }
1.10 markus 833: if (status != SSH2_FX_OK)
1.1 markus 834: send_status(id, status);
1.97 djm 835: free(name);
1.1 markus 836: }
837:
1.28 itojun 838: static void
1.98 djm 839: process_stat(u_int32_t id)
1.1 markus 840: {
1.98 djm 841: process_do_stat(id, 0);
1.1 markus 842: }
843:
1.28 itojun 844: static void
1.98 djm 845: process_lstat(u_int32_t id)
1.1 markus 846: {
1.98 djm 847: process_do_stat(id, 1);
1.1 markus 848: }
849:
1.28 itojun 850: static void
1.98 djm 851: process_fstat(u_int32_t id)
1.1 markus 852: {
1.13 markus 853: Attrib a;
1.1 markus 854: struct stat st;
1.104 djm 855: int fd, r, handle, status = SSH2_FX_FAILURE;
1.1 markus 856:
1.104 djm 857: if ((r = get_handle(iqueue, &handle)) != 0)
858: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.58 djm 859: debug("request %u: fstat \"%s\" (handle %u)",
860: id, handle_to_name(handle), handle);
1.1 markus 861: fd = handle_to_fd(handle);
1.71 stevesk 862: if (fd >= 0) {
1.104 djm 863: r = fstat(fd, &st);
864: if (r < 0) {
1.1 markus 865: status = errno_to_portable(errno);
866: } else {
1.13 markus 867: stat_to_attrib(&st, &a);
868: send_attrib(id, &a);
1.10 markus 869: status = SSH2_FX_OK;
1.1 markus 870: }
871: }
1.10 markus 872: if (status != SSH2_FX_OK)
1.1 markus 873: send_status(id, status);
874: }
875:
1.28 itojun 876: static struct timeval *
1.44 jakob 877: attrib_to_tv(const Attrib *a)
1.1 markus 878: {
879: static struct timeval tv[2];
1.22 deraadt 880:
1.1 markus 881: tv[0].tv_sec = a->atime;
882: tv[0].tv_usec = 0;
883: tv[1].tv_sec = a->mtime;
884: tv[1].tv_usec = 0;
885: return tv;
886: }
887:
1.114 ! djm 888: static struct timespec *
! 889: attrib_to_ts(const Attrib *a)
! 890: {
! 891: static struct timespec ts[2];
! 892:
! 893: ts[0].tv_sec = a->atime;
! 894: ts[0].tv_nsec = 0;
! 895: ts[1].tv_sec = a->mtime;
! 896: ts[1].tv_nsec = 0;
! 897: return ts;
! 898: }
! 899:
1.28 itojun 900: static void
1.98 djm 901: process_setstat(u_int32_t id)
1.1 markus 902: {
1.104 djm 903: Attrib a;
1.1 markus 904: char *name;
1.104 djm 905: int r, status = SSH2_FX_OK;
906:
907: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0 ||
908: (r = decode_attrib(iqueue, &a)) != 0)
909: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 markus 910:
1.58 djm 911: debug("request %u: setstat name \"%s\"", id, name);
1.104 djm 912: if (a.flags & SSH2_FILEXFER_ATTR_SIZE) {
1.72 stevesk 913: logit("set \"%s\" size %llu",
1.104 djm 914: name, (unsigned long long)a.size);
915: r = truncate(name, a.size);
916: if (r == -1)
1.33 markus 917: status = errno_to_portable(errno);
918: }
1.104 djm 919: if (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
920: logit("set \"%s\" mode %04o", name, a.perm);
921: r = chmod(name, a.perm & 07777);
922: if (r == -1)
1.1 markus 923: status = errno_to_portable(errno);
924: }
1.104 djm 925: if (a.flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
1.58 djm 926: char buf[64];
1.104 djm 927: time_t t = a.mtime;
1.58 djm 928:
929: strftime(buf, sizeof(buf), "%Y%m%d-%H:%M:%S",
930: localtime(&t));
931: logit("set \"%s\" modtime %s", name, buf);
1.104 djm 932: r = utimes(name, attrib_to_tv(&a));
933: if (r == -1)
1.1 markus 934: status = errno_to_portable(errno);
935: }
1.104 djm 936: if (a.flags & SSH2_FILEXFER_ATTR_UIDGID) {
1.58 djm 937: logit("set \"%s\" owner %lu group %lu", name,
1.104 djm 938: (u_long)a.uid, (u_long)a.gid);
939: r = chown(name, a.uid, a.gid);
940: if (r == -1)
1.18 stevesk 941: status = errno_to_portable(errno);
942: }
1.1 markus 943: send_status(id, status);
1.97 djm 944: free(name);
1.1 markus 945: }
946:
1.28 itojun 947: static void
1.98 djm 948: process_fsetstat(u_int32_t id)
1.1 markus 949: {
1.104 djm 950: Attrib a;
951: int handle, fd, r;
1.10 markus 952: int status = SSH2_FX_OK;
1.1 markus 953:
1.104 djm 954: if ((r = get_handle(iqueue, &handle)) != 0 ||
955: (r = decode_attrib(iqueue, &a)) != 0)
956: fatal("%s: buffer error: %s", __func__, ssh_err(r));
957:
1.58 djm 958: debug("request %u: fsetstat handle %d", id, handle);
1.1 markus 959: fd = handle_to_fd(handle);
1.90 djm 960: if (fd < 0)
1.10 markus 961: status = SSH2_FX_FAILURE;
1.90 djm 962: else {
1.58 djm 963: char *name = handle_to_name(handle);
964:
1.104 djm 965: if (a.flags & SSH2_FILEXFER_ATTR_SIZE) {
1.72 stevesk 966: logit("set \"%s\" size %llu",
1.104 djm 967: name, (unsigned long long)a.size);
968: r = ftruncate(fd, a.size);
969: if (r == -1)
1.33 markus 970: status = errno_to_portable(errno);
971: }
1.104 djm 972: if (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
973: logit("set \"%s\" mode %04o", name, a.perm);
974: r = fchmod(fd, a.perm & 07777);
975: if (r == -1)
1.1 markus 976: status = errno_to_portable(errno);
977: }
1.104 djm 978: if (a.flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
1.58 djm 979: char buf[64];
1.104 djm 980: time_t t = a.mtime;
1.58 djm 981:
982: strftime(buf, sizeof(buf), "%Y%m%d-%H:%M:%S",
983: localtime(&t));
984: logit("set \"%s\" modtime %s", name, buf);
1.104 djm 985: r = futimes(fd, attrib_to_tv(&a));
986: if (r == -1)
1.18 stevesk 987: status = errno_to_portable(errno);
988: }
1.104 djm 989: if (a.flags & SSH2_FILEXFER_ATTR_UIDGID) {
1.58 djm 990: logit("set \"%s\" owner %lu group %lu", name,
1.104 djm 991: (u_long)a.uid, (u_long)a.gid);
992: r = fchown(fd, a.uid, a.gid);
993: if (r == -1)
1.1 markus 994: status = errno_to_portable(errno);
995: }
996: }
997: send_status(id, status);
998: }
999:
1.28 itojun 1000: static void
1.98 djm 1001: process_opendir(u_int32_t id)
1.1 markus 1002: {
1003: DIR *dirp = NULL;
1004: char *path;
1.104 djm 1005: int r, handle, status = SSH2_FX_FAILURE;
1006:
1007: if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
1008: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 markus 1009:
1.58 djm 1010: debug3("request %u: opendir", id);
1011: logit("opendir \"%s\"", path);
1.17 stevesk 1012: dirp = opendir(path);
1.1 markus 1013: if (dirp == NULL) {
1014: status = errno_to_portable(errno);
1015: } else {
1.101 djm 1016: handle = handle_new(HANDLE_DIR, path, 0, 0, dirp);
1.1 markus 1017: if (handle < 0) {
1018: closedir(dirp);
1019: } else {
1020: send_handle(id, handle);
1.10 markus 1021: status = SSH2_FX_OK;
1.1 markus 1022: }
1.17 stevesk 1023:
1.1 markus 1024: }
1.10 markus 1025: if (status != SSH2_FX_OK)
1.1 markus 1026: send_status(id, status);
1.97 djm 1027: free(path);
1.1 markus 1028: }
1029:
1.28 itojun 1030: static void
1.98 djm 1031: process_readdir(u_int32_t id)
1.1 markus 1032: {
1033: DIR *dirp;
1034: struct dirent *dp;
1035: char *path;
1.104 djm 1036: int r, handle;
1037:
1038: if ((r = get_handle(iqueue, &handle)) != 0)
1039: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 markus 1040:
1.58 djm 1041: debug("request %u: readdir \"%s\" (handle %d)", id,
1042: handle_to_name(handle), handle);
1.1 markus 1043: dirp = handle_to_dir(handle);
1044: path = handle_to_name(handle);
1045: if (dirp == NULL || path == NULL) {
1.10 markus 1046: send_status(id, SSH2_FX_FAILURE);
1.1 markus 1047: } else {
1048: struct stat st;
1.105 deraadt 1049: char pathname[PATH_MAX];
1.1 markus 1050: Stat *stats;
1051: int nstats = 10, count = 0, i;
1.36 deraadt 1052:
1.54 djm 1053: stats = xcalloc(nstats, sizeof(Stat));
1.1 markus 1054: while ((dp = readdir(dirp)) != NULL) {
1055: if (count >= nstats) {
1056: nstats *= 2;
1.106 deraadt 1057: stats = xreallocarray(stats, nstats, sizeof(Stat));
1.1 markus 1058: }
1059: /* XXX OVERFLOW ? */
1.30 jakob 1060: snprintf(pathname, sizeof pathname, "%s%s%s", path,
1061: strcmp(path, "/") ? "/" : "", dp->d_name);
1.1 markus 1062: if (lstat(pathname, &st) < 0)
1063: continue;
1.13 markus 1064: stat_to_attrib(&st, &(stats[count].attrib));
1.1 markus 1065: stats[count].name = xstrdup(dp->d_name);
1.91 djm 1066: stats[count].long_name = ls_file(dp->d_name, &st, 0, 0);
1.1 markus 1067: count++;
1068: /* send up to 100 entries in one message */
1.11 markus 1069: /* XXX check packet size instead */
1.1 markus 1070: if (count == 100)
1071: break;
1072: }
1.10 markus 1073: if (count > 0) {
1074: send_names(id, count, stats);
1.31 deraadt 1075: for (i = 0; i < count; i++) {
1.97 djm 1076: free(stats[i].name);
1077: free(stats[i].long_name);
1.10 markus 1078: }
1079: } else {
1080: send_status(id, SSH2_FX_EOF);
1.1 markus 1081: }
1.97 djm 1082: free(stats);
1.1 markus 1083: }
1084: }
1085:
1.28 itojun 1086: static void
1.98 djm 1087: process_remove(u_int32_t id)
1.1 markus 1088: {
1089: char *name;
1.104 djm 1090: int r, status = SSH2_FX_FAILURE;
1091:
1092: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0)
1093: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 markus 1094:
1.58 djm 1095: debug3("request %u: remove", id);
1096: logit("remove name \"%s\"", name);
1.104 djm 1097: r = unlink(name);
1098: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.1 markus 1099: send_status(id, status);
1.97 djm 1100: free(name);
1.1 markus 1101: }
1102:
1.28 itojun 1103: static void
1.98 djm 1104: process_mkdir(u_int32_t id)
1.1 markus 1105: {
1.104 djm 1106: Attrib a;
1.1 markus 1107: char *name;
1.104 djm 1108: int r, mode, status = SSH2_FX_FAILURE;
1109:
1110: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0 ||
1111: (r = decode_attrib(iqueue, &a)) != 0)
1112: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 markus 1113:
1.104 djm 1114: mode = (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ?
1115: a.perm & 07777 : 0777;
1.58 djm 1116: debug3("request %u: mkdir", id);
1117: logit("mkdir name \"%s\" mode 0%o", name, mode);
1.104 djm 1118: r = mkdir(name, mode);
1119: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.1 markus 1120: send_status(id, status);
1.97 djm 1121: free(name);
1.1 markus 1122: }
1123:
1.28 itojun 1124: static void
1.98 djm 1125: process_rmdir(u_int32_t id)
1.1 markus 1126: {
1127: char *name;
1.104 djm 1128: int r, status;
1129:
1130: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0)
1131: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 markus 1132:
1.58 djm 1133: debug3("request %u: rmdir", id);
1134: logit("rmdir name \"%s\"", name);
1.104 djm 1135: r = rmdir(name);
1136: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.1 markus 1137: send_status(id, status);
1.97 djm 1138: free(name);
1.1 markus 1139: }
1140:
1.28 itojun 1141: static void
1.98 djm 1142: process_realpath(u_int32_t id)
1.1 markus 1143: {
1.105 deraadt 1144: char resolvedname[PATH_MAX];
1.1 markus 1145: char *path;
1.104 djm 1146: int r;
1147:
1148: if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
1149: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 markus 1150:
1.7 markus 1151: if (path[0] == '\0') {
1.97 djm 1152: free(path);
1.7 markus 1153: path = xstrdup(".");
1154: }
1.58 djm 1155: debug3("request %u: realpath", id);
1156: verbose("realpath \"%s\"", path);
1.1 markus 1157: if (realpath(path, resolvedname) == NULL) {
1158: send_status(id, errno_to_portable(errno));
1159: } else {
1160: Stat s;
1161: attrib_clear(&s.attrib);
1162: s.name = s.long_name = resolvedname;
1163: send_names(id, 1, &s);
1164: }
1.97 djm 1165: free(path);
1.1 markus 1166: }
1167:
1.28 itojun 1168: static void
1.98 djm 1169: process_rename(u_int32_t id)
1.1 markus 1170: {
1171: char *oldpath, *newpath;
1.104 djm 1172: int r, status;
1.41 deraadt 1173: struct stat sb;
1.1 markus 1174:
1.104 djm 1175: if ((r = sshbuf_get_cstring(iqueue, &oldpath, NULL)) != 0 ||
1176: (r = sshbuf_get_cstring(iqueue, &newpath, NULL)) != 0)
1177: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1178:
1.58 djm 1179: debug3("request %u: rename", id);
1180: logit("rename old \"%s\" new \"%s\"", oldpath, newpath);
1.41 deraadt 1181: status = SSH2_FX_FAILURE;
1.98 djm 1182: if (lstat(oldpath, &sb) == -1)
1.39 markus 1183: status = errno_to_portable(errno);
1.41 deraadt 1184: else if (S_ISREG(sb.st_mode)) {
1185: /* Race-free rename of regular files */
1.47 dtucker 1186: if (link(oldpath, newpath) == -1) {
1187: if (errno == EOPNOTSUPP) {
1188: struct stat st;
1189:
1190: /*
1191: * fs doesn't support links, so fall back to
1192: * stat+rename. This is racy.
1193: */
1194: if (stat(newpath, &st) == -1) {
1195: if (rename(oldpath, newpath) == -1)
1196: status =
1197: errno_to_portable(errno);
1198: else
1199: status = SSH2_FX_OK;
1200: }
1201: } else {
1202: status = errno_to_portable(errno);
1203: }
1204: } else if (unlink(oldpath) == -1) {
1.41 deraadt 1205: status = errno_to_portable(errno);
1206: /* clean spare link */
1207: unlink(newpath);
1208: } else
1209: status = SSH2_FX_OK;
1210: } else if (stat(newpath, &sb) == -1) {
1211: if (rename(oldpath, newpath) == -1)
1212: status = errno_to_portable(errno);
1213: else
1214: status = SSH2_FX_OK;
1215: }
1.1 markus 1216: send_status(id, status);
1.97 djm 1217: free(oldpath);
1218: free(newpath);
1.1 markus 1219: }
1220:
1.28 itojun 1221: static void
1.98 djm 1222: process_readlink(u_int32_t id)
1.23 djm 1223: {
1.104 djm 1224: int r, len;
1.105 deraadt 1225: char buf[PATH_MAX];
1.23 djm 1226: char *path;
1227:
1.104 djm 1228: if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
1229: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1230:
1.58 djm 1231: debug3("request %u: readlink", id);
1232: verbose("readlink \"%s\"", path);
1.46 avsm 1233: if ((len = readlink(path, buf, sizeof(buf) - 1)) == -1)
1.23 djm 1234: send_status(id, errno_to_portable(errno));
1235: else {
1236: Stat s;
1.31 deraadt 1237:
1.46 avsm 1238: buf[len] = '\0';
1.23 djm 1239: attrib_clear(&s.attrib);
1.46 avsm 1240: s.name = s.long_name = buf;
1.23 djm 1241: send_names(id, 1, &s);
1242: }
1.97 djm 1243: free(path);
1.23 djm 1244: }
1245:
1.28 itojun 1246: static void
1.98 djm 1247: process_symlink(u_int32_t id)
1.23 djm 1248: {
1249: char *oldpath, *newpath;
1.104 djm 1250: int r, status;
1251:
1252: if ((r = sshbuf_get_cstring(iqueue, &oldpath, NULL)) != 0 ||
1253: (r = sshbuf_get_cstring(iqueue, &newpath, NULL)) != 0)
1254: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.23 djm 1255:
1.58 djm 1256: debug3("request %u: symlink", id);
1257: logit("symlink old \"%s\" new \"%s\"", oldpath, newpath);
1.39 markus 1258: /* this will fail if 'newpath' exists */
1.104 djm 1259: r = symlink(oldpath, newpath);
1260: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.23 djm 1261: send_status(id, status);
1.97 djm 1262: free(oldpath);
1263: free(newpath);
1.23 djm 1264: }
1265:
1.28 itojun 1266: static void
1.78 djm 1267: process_extended_posix_rename(u_int32_t id)
1268: {
1269: char *oldpath, *newpath;
1.104 djm 1270: int r, status;
1271:
1272: if ((r = sshbuf_get_cstring(iqueue, &oldpath, NULL)) != 0 ||
1273: (r = sshbuf_get_cstring(iqueue, &newpath, NULL)) != 0)
1274: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.78 djm 1275:
1276: debug3("request %u: posix-rename", id);
1277: logit("posix-rename old \"%s\" new \"%s\"", oldpath, newpath);
1.104 djm 1278: r = rename(oldpath, newpath);
1279: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.90 djm 1280: send_status(id, status);
1.97 djm 1281: free(oldpath);
1282: free(newpath);
1.78 djm 1283: }
1284:
1285: static void
1.79 djm 1286: process_extended_statvfs(u_int32_t id)
1287: {
1288: char *path;
1289: struct statvfs st;
1.104 djm 1290: int r;
1.79 djm 1291:
1.104 djm 1292: if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
1293: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.103 dtucker 1294: debug3("request %u: statvfs", id);
1295: logit("statvfs \"%s\"", path);
1.79 djm 1296:
1297: if (statvfs(path, &st) != 0)
1298: send_status(id, errno_to_portable(errno));
1299: else
1300: send_statvfs(id, &st);
1.97 djm 1301: free(path);
1.79 djm 1302: }
1303:
1304: static void
1305: process_extended_fstatvfs(u_int32_t id)
1306: {
1.104 djm 1307: int r, handle, fd;
1.79 djm 1308: struct statvfs st;
1309:
1.104 djm 1310: if ((r = get_handle(iqueue, &handle)) != 0)
1311: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.79 djm 1312: debug("request %u: fstatvfs \"%s\" (handle %u)",
1313: id, handle_to_name(handle), handle);
1314: if ((fd = handle_to_fd(handle)) < 0) {
1315: send_status(id, SSH2_FX_FAILURE);
1316: return;
1317: }
1318: if (fstatvfs(fd, &st) != 0)
1319: send_status(id, errno_to_portable(errno));
1320: else
1321: send_statvfs(id, &st);
1322: }
1323:
1324: static void
1.93 djm 1325: process_extended_hardlink(u_int32_t id)
1326: {
1327: char *oldpath, *newpath;
1.104 djm 1328: int r, status;
1329:
1330: if ((r = sshbuf_get_cstring(iqueue, &oldpath, NULL)) != 0 ||
1331: (r = sshbuf_get_cstring(iqueue, &newpath, NULL)) != 0)
1332: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.93 djm 1333:
1334: debug3("request %u: hardlink", id);
1335: logit("hardlink old \"%s\" new \"%s\"", oldpath, newpath);
1.104 djm 1336: r = link(oldpath, newpath);
1337: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.93 djm 1338: send_status(id, status);
1.97 djm 1339: free(oldpath);
1340: free(newpath);
1.102 djm 1341: }
1342:
1343: static void
1344: process_extended_fsync(u_int32_t id)
1345: {
1.104 djm 1346: int handle, fd, r, status = SSH2_FX_OP_UNSUPPORTED;
1.102 djm 1347:
1.104 djm 1348: if ((r = get_handle(iqueue, &handle)) != 0)
1349: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.102 djm 1350: debug3("request %u: fsync (handle %u)", id, handle);
1351: verbose("fsync \"%s\"", handle_to_name(handle));
1352: if ((fd = handle_to_fd(handle)) < 0)
1353: status = SSH2_FX_NO_SUCH_FILE;
1354: else if (handle_is_ok(handle, HANDLE_FILE)) {
1.104 djm 1355: r = fsync(fd);
1356: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.102 djm 1357: }
1358: send_status(id, status);
1.114 ! djm 1359: }
! 1360:
! 1361: static void
! 1362: process_extended_lsetstat(u_int32_t id)
! 1363: {
! 1364: Attrib a;
! 1365: char *name;
! 1366: int r, status = SSH2_FX_OK;
! 1367:
! 1368: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0 ||
! 1369: (r = decode_attrib(iqueue, &a)) != 0)
! 1370: fatal("%s: buffer error: %s", __func__, ssh_err(r));
! 1371:
! 1372: debug("request %u: lsetstat name \"%s\"", id, name);
! 1373: if (a.flags & SSH2_FILEXFER_ATTR_SIZE) {
! 1374: /* nonsensical for links */
! 1375: status = SSH2_FX_BAD_MESSAGE;
! 1376: goto out;
! 1377: }
! 1378: if (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
! 1379: logit("set \"%s\" mode %04o", name, a.perm);
! 1380: r = fchmodat(AT_FDCWD, name,
! 1381: a.perm & 07777, AT_SYMLINK_NOFOLLOW);
! 1382: if (r == -1)
! 1383: status = errno_to_portable(errno);
! 1384: }
! 1385: if (a.flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
! 1386: char buf[64];
! 1387: time_t t = a.mtime;
! 1388:
! 1389: strftime(buf, sizeof(buf), "%Y%m%d-%H:%M:%S",
! 1390: localtime(&t));
! 1391: logit("set \"%s\" modtime %s", name, buf);
! 1392: r = utimensat(AT_FDCWD, name,
! 1393: attrib_to_ts(&a), AT_SYMLINK_NOFOLLOW);
! 1394: if (r == -1)
! 1395: status = errno_to_portable(errno);
! 1396: }
! 1397: if (a.flags & SSH2_FILEXFER_ATTR_UIDGID) {
! 1398: logit("set \"%s\" owner %lu group %lu", name,
! 1399: (u_long)a.uid, (u_long)a.gid);
! 1400: r = fchownat(AT_FDCWD, name, a.uid, a.gid,
! 1401: AT_SYMLINK_NOFOLLOW);
! 1402: if (r == -1)
! 1403: status = errno_to_portable(errno);
! 1404: }
! 1405: out:
! 1406: send_status(id, status);
! 1407: free(name);
1.93 djm 1408: }
1409:
1410: static void
1.98 djm 1411: process_extended(u_int32_t id)
1.10 markus 1412: {
1413: char *request;
1.104 djm 1414: int i, r;
1.10 markus 1415:
1.104 djm 1416: if ((r = sshbuf_get_cstring(iqueue, &request, NULL)) != 0)
1417: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.98 djm 1418: for (i = 0; extended_handlers[i].handler != NULL; i++) {
1419: if (strcmp(request, extended_handlers[i].ext_name) == 0) {
1420: if (!request_permitted(&extended_handlers[i]))
1421: send_status(id, SSH2_FX_PERMISSION_DENIED);
1422: else
1423: extended_handlers[i].handler(id);
1424: break;
1425: }
1426: }
1427: if (extended_handlers[i].handler == NULL) {
1428: error("Unknown extended request \"%.100s\"", request);
1.78 djm 1429: send_status(id, SSH2_FX_OP_UNSUPPORTED); /* MUST */
1.98 djm 1430: }
1.97 djm 1431: free(request);
1.10 markus 1432: }
1.1 markus 1433:
1434: /* stolen from ssh-agent */
1435:
1.28 itojun 1436: static void
1.1 markus 1437: process(void)
1438: {
1.104 djm 1439: u_int msg_len;
1440: u_int buf_len;
1441: u_int consumed;
1442: u_char type;
1443: const u_char *cp;
1444: int i, r;
1.98 djm 1445: u_int32_t id;
1.1 markus 1446:
1.104 djm 1447: buf_len = sshbuf_len(iqueue);
1.34 markus 1448: if (buf_len < 5)
1.1 markus 1449: return; /* Incomplete message. */
1.104 djm 1450: cp = sshbuf_ptr(iqueue);
1.57 djm 1451: msg_len = get_u32(cp);
1.50 djm 1452: if (msg_len > SFTP_MAX_MSG_LENGTH) {
1.58 djm 1453: error("bad message from %s local user %s",
1454: client_addr, pw->pw_name);
1.76 markus 1455: sftp_server_cleanup_exit(11);
1.1 markus 1456: }
1.34 markus 1457: if (buf_len < msg_len + 4)
1.1 markus 1458: return;
1.104 djm 1459: if ((r = sshbuf_consume(iqueue, 4)) != 0)
1460: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.34 markus 1461: buf_len -= 4;
1.104 djm 1462: if ((r = sshbuf_get_u8(iqueue, &type)) != 0)
1463: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.98 djm 1464:
1.1 markus 1465: switch (type) {
1.10 markus 1466: case SSH2_FXP_INIT:
1.1 markus 1467: process_init();
1.98 djm 1468: init_done = 1;
1.1 markus 1469: break;
1.10 markus 1470: case SSH2_FXP_EXTENDED:
1.98 djm 1471: if (!init_done)
1472: fatal("Received extended request before init");
1.104 djm 1473: if ((r = sshbuf_get_u32(iqueue, &id)) != 0)
1474: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.98 djm 1475: process_extended(id);
1.10 markus 1476: break;
1.1 markus 1477: default:
1.98 djm 1478: if (!init_done)
1479: fatal("Received %u request before init", type);
1.104 djm 1480: if ((r = sshbuf_get_u32(iqueue, &id)) != 0)
1481: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.98 djm 1482: for (i = 0; handlers[i].handler != NULL; i++) {
1483: if (type == handlers[i].type) {
1484: if (!request_permitted(&handlers[i])) {
1485: send_status(id,
1486: SSH2_FX_PERMISSION_DENIED);
1487: } else {
1488: handlers[i].handler(id);
1489: }
1490: break;
1491: }
1492: }
1493: if (handlers[i].handler == NULL)
1494: error("Unknown message %u", type);
1.1 markus 1495: }
1.34 markus 1496: /* discard the remaining bytes from the current packet */
1.104 djm 1497: if (buf_len < sshbuf_len(iqueue)) {
1.76 markus 1498: error("iqueue grew unexpectedly");
1499: sftp_server_cleanup_exit(255);
1500: }
1.104 djm 1501: consumed = buf_len - sshbuf_len(iqueue);
1.76 markus 1502: if (msg_len < consumed) {
1.98 djm 1503: error("msg_len %u < consumed %u", msg_len, consumed);
1.76 markus 1504: sftp_server_cleanup_exit(255);
1505: }
1.104 djm 1506: if (msg_len > consumed &&
1507: (r = sshbuf_consume(iqueue, msg_len - consumed)) != 0)
1508: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1.1 markus 1509: }
1510:
1.58 djm 1511: /* Cleanup handler that logs active handles upon normal exit */
1512: void
1.76 markus 1513: sftp_server_cleanup_exit(int i)
1.58 djm 1514: {
1515: if (pw != NULL && client_addr != NULL) {
1516: handle_log_exit();
1517: logit("session closed for local user %s from [%s]",
1518: pw->pw_name, client_addr);
1519: }
1520: _exit(i);
1521: }
1522:
1523: static void
1.76 markus 1524: sftp_server_usage(void)
1.58 djm 1525: {
1526: extern char *__progname;
1527:
1528: fprintf(stderr,
1.96 jmc 1529: "usage: %s [-ehR] [-d start_directory] [-f log_facility] "
1.100 jmc 1530: "[-l log_level]\n\t[-P blacklisted_requests] "
1531: "[-p whitelisted_requests] [-u umask]\n"
1532: " %s -Q protocol_feature\n",
1533: __progname, __progname);
1.58 djm 1534: exit(1);
1535: }
1536:
1.1 markus 1537: int
1.77 djm 1538: sftp_server_main(int argc, char **argv, struct passwd *user_pw)
1.1 markus 1539: {
1.21 millert 1540: fd_set *rset, *wset;
1.104 djm 1541: int i, r, in, out, max, ch, skipargs = 0, log_stderr = 0;
1.21 millert 1542: ssize_t len, olen, set_size;
1.58 djm 1543: SyslogFacility log_facility = SYSLOG_FACILITY_AUTH;
1.112 djm 1544: char *cp, *homedir = NULL, uidstr[32], buf[4*4096];
1.92 djm 1545: long mask;
1.58 djm 1546:
1547: extern char *optarg;
1548: extern char *__progname;
1.49 djm 1549:
1.109 dtucker 1550: ssh_malloc_init(); /* must be called before any mallocs */
1.58 djm 1551: log_init(__progname, log_level, log_facility, log_stderr);
1552:
1.95 djm 1553: pw = pwcopy(user_pw);
1554:
1.98 djm 1555: while (!skipargs && (ch = getopt(argc, argv,
1556: "d:f:l:P:p:Q:u:cehR")) != -1) {
1.58 djm 1557: switch (ch) {
1.98 djm 1558: case 'Q':
1559: if (strcasecmp(optarg, "requests") != 0) {
1560: fprintf(stderr, "Invalid query type\n");
1561: exit(1);
1562: }
1563: for (i = 0; handlers[i].handler != NULL; i++)
1564: printf("%s\n", handlers[i].name);
1565: for (i = 0; extended_handlers[i].handler != NULL; i++)
1566: printf("%s\n", extended_handlers[i].name);
1567: exit(0);
1568: break;
1.90 djm 1569: case 'R':
1570: readonly = 1;
1571: break;
1.58 djm 1572: case 'c':
1573: /*
1574: * Ignore all arguments if we are invoked as a
1.70 deraadt 1575: * shell using "sftp-server -c command"
1.58 djm 1576: */
1577: skipargs = 1;
1578: break;
1579: case 'e':
1580: log_stderr = 1;
1581: break;
1582: case 'l':
1583: log_level = log_level_number(optarg);
1584: if (log_level == SYSLOG_LEVEL_NOT_SET)
1585: error("Invalid log level \"%s\"", optarg);
1586: break;
1587: case 'f':
1588: log_facility = log_facility_number(optarg);
1.74 djm 1589: if (log_facility == SYSLOG_FACILITY_NOT_SET)
1.58 djm 1590: error("Invalid log facility \"%s\"", optarg);
1.86 djm 1591: break;
1.95 djm 1592: case 'd':
1593: cp = tilde_expand_filename(optarg, user_pw->pw_uid);
1.112 djm 1594: snprintf(uidstr, sizeof(uidstr), "%llu",
1595: (unsigned long long)pw->pw_uid);
1.95 djm 1596: homedir = percent_expand(cp, "d", user_pw->pw_dir,
1.112 djm 1597: "u", user_pw->pw_name, "U", uidstr, (char *)NULL);
1.95 djm 1598: free(cp);
1.98 djm 1599: break;
1600: case 'p':
1601: if (request_whitelist != NULL)
1602: fatal("Permitted requests already set");
1603: request_whitelist = xstrdup(optarg);
1604: break;
1605: case 'P':
1606: if (request_blacklist != NULL)
1607: fatal("Refused requests already set");
1608: request_blacklist = xstrdup(optarg);
1.95 djm 1609: break;
1.86 djm 1610: case 'u':
1.92 djm 1611: errno = 0;
1612: mask = strtol(optarg, &cp, 8);
1613: if (mask < 0 || mask > 0777 || *cp != '\0' ||
1614: cp == optarg || (mask == 0 && errno != 0))
1615: fatal("Invalid umask \"%s\"", optarg);
1616: (void)umask((mode_t)mask);
1.58 djm 1617: break;
1618: case 'h':
1619: default:
1.76 markus 1620: sftp_server_usage();
1.58 djm 1621: }
1622: }
1623:
1624: log_init(__progname, log_level, log_facility, log_stderr);
1625:
1626: if ((cp = getenv("SSH_CONNECTION")) != NULL) {
1627: client_addr = xstrdup(cp);
1.76 markus 1628: if ((cp = strchr(client_addr, ' ')) == NULL) {
1629: error("Malformed SSH_CONNECTION variable: \"%s\"",
1.58 djm 1630: getenv("SSH_CONNECTION"));
1.76 markus 1631: sftp_server_cleanup_exit(255);
1632: }
1.58 djm 1633: *cp = '\0';
1634: } else
1635: client_addr = xstrdup("UNKNOWN");
1636:
1637: logit("session opened for local user %s from [%s]",
1638: pw->pw_name, client_addr);
1.10 markus 1639:
1.89 djm 1640: in = STDIN_FILENO;
1641: out = STDOUT_FILENO;
1.1 markus 1642:
1643: max = 0;
1644: if (in > max)
1645: max = in;
1646: if (out > max)
1647: max = out;
1648:
1.104 djm 1649: if ((iqueue = sshbuf_new()) == NULL)
1650: fatal("%s: sshbuf_new failed", __func__);
1651: if ((oqueue = sshbuf_new()) == NULL)
1652: fatal("%s: sshbuf_new failed", __func__);
1.1 markus 1653:
1.108 logan 1654: rset = xcalloc(howmany(max + 1, NFDBITS), sizeof(fd_mask));
1655: wset = xcalloc(howmany(max + 1, NFDBITS), sizeof(fd_mask));
1.95 djm 1656:
1657: if (homedir != NULL) {
1658: if (chdir(homedir) != 0) {
1659: error("chdir to \"%s\" failed: %s", homedir,
1660: strerror(errno));
1661: }
1662: }
1.21 millert 1663:
1.108 logan 1664: set_size = howmany(max + 1, NFDBITS) * sizeof(fd_mask);
1.1 markus 1665: for (;;) {
1.21 millert 1666: memset(rset, 0, set_size);
1667: memset(wset, 0, set_size);
1.1 markus 1668:
1.73 djm 1669: /*
1670: * Ensure that we can read a full buffer and handle
1671: * the worst-case length packet it can generate,
1672: * otherwise apply backpressure by stopping reads.
1673: */
1.104 djm 1674: if ((r = sshbuf_check_reserve(iqueue, sizeof(buf))) == 0 &&
1675: (r = sshbuf_check_reserve(oqueue,
1676: SFTP_MAX_MSG_LENGTH)) == 0)
1.73 djm 1677: FD_SET(in, rset);
1.104 djm 1678: else if (r != SSH_ERR_NO_BUFFER_SPACE)
1679: fatal("%s: sshbuf_check_reserve failed: %s",
1680: __func__, ssh_err(r));
1.73 djm 1681:
1.104 djm 1682: olen = sshbuf_len(oqueue);
1.1 markus 1683: if (olen > 0)
1.21 millert 1684: FD_SET(out, wset);
1.1 markus 1685:
1.21 millert 1686: if (select(max+1, rset, wset, NULL, NULL) < 0) {
1.1 markus 1687: if (errno == EINTR)
1688: continue;
1.58 djm 1689: error("select: %s", strerror(errno));
1.76 markus 1690: sftp_server_cleanup_exit(2);
1.1 markus 1691: }
1692:
1693: /* copy stdin to iqueue */
1.21 millert 1694: if (FD_ISSET(in, rset)) {
1.1 markus 1695: len = read(in, buf, sizeof buf);
1696: if (len == 0) {
1697: debug("read eof");
1.76 markus 1698: sftp_server_cleanup_exit(0);
1.1 markus 1699: } else if (len < 0) {
1.58 djm 1700: error("read: %s", strerror(errno));
1.76 markus 1701: sftp_server_cleanup_exit(1);
1.104 djm 1702: } else if ((r = sshbuf_put(iqueue, buf, len)) != 0) {
1703: fatal("%s: buffer error: %s",
1704: __func__, ssh_err(r));
1.1 markus 1705: }
1706: }
1707: /* send oqueue to stdout */
1.21 millert 1708: if (FD_ISSET(out, wset)) {
1.104 djm 1709: len = write(out, sshbuf_ptr(oqueue), olen);
1.1 markus 1710: if (len < 0) {
1.58 djm 1711: error("write: %s", strerror(errno));
1.76 markus 1712: sftp_server_cleanup_exit(1);
1.104 djm 1713: } else if ((r = sshbuf_consume(oqueue, len)) != 0) {
1714: fatal("%s: buffer error: %s",
1715: __func__, ssh_err(r));
1.1 markus 1716: }
1717: }
1.73 djm 1718:
1719: /*
1720: * Process requests from client if we can fit the results
1721: * into the output buffer, otherwise stop processing input
1722: * and let the output queue drain.
1723: */
1.104 djm 1724: r = sshbuf_check_reserve(oqueue, SFTP_MAX_MSG_LENGTH);
1725: if (r == 0)
1.73 djm 1726: process();
1.104 djm 1727: else if (r != SSH_ERR_NO_BUFFER_SPACE)
1728: fatal("%s: sshbuf_check_reserve: %s",
1729: __func__, ssh_err(r));
1.1 markus 1730: }
1731: }
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