Annotation of src/usr.bin/ssh/sftp-server.c, Revision 1.143
1.143 ! djm 1: /* $OpenBSD: sftp-server.c,v 1.142 2022/09/16 06:55:37 djm Exp $ */
1.1 markus 2: /*
1.45 markus 3: * Copyright (c) 2000-2004 Markus Friedl. All rights reserved.
1.1 markus 4: *
1.45 markus 5: * Permission to use, copy, modify, and distribute this software for any
6: * purpose with or without fee is hereby granted, provided that the above
7: * copyright notice and this permission notice appear in all copies.
1.1 markus 8: *
1.45 markus 9: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
1.1 markus 16: */
1.52 stevesk 17:
18: #include <sys/types.h>
1.122 djm 19: #include <sys/resource.h>
1.52 stevesk 20: #include <sys/stat.h>
1.66 stevesk 21: #include <sys/time.h>
1.79 djm 22: #include <sys/mount.h>
23: #include <sys/statvfs.h>
1.51 stevesk 24:
25: #include <dirent.h>
1.62 stevesk 26: #include <errno.h>
1.59 stevesk 27: #include <fcntl.h>
1.132 deraadt 28: #include <poll.h>
1.68 stevesk 29: #include <stdlib.h>
1.69 stevesk 30: #include <stdio.h>
1.65 stevesk 31: #include <string.h>
1.70 deraadt 32: #include <pwd.h>
1.143 ! djm 33: #include <grp.h>
1.64 stevesk 34: #include <time.h>
1.63 stevesk 35: #include <unistd.h>
1.70 deraadt 36: #include <stdarg.h>
1.1 markus 37:
1.140 djm 38: #include "atomicio.h"
1.70 deraadt 39: #include "xmalloc.h"
1.104 djm 40: #include "sshbuf.h"
41: #include "ssherr.h"
1.14 markus 42: #include "log.h"
1.49 djm 43: #include "misc.h"
1.98 djm 44: #include "match.h"
1.58 djm 45: #include "uidswap.h"
1.1 markus 46:
1.10 markus 47: #include "sftp.h"
1.15 djm 48: #include "sftp-common.h"
1.1 markus 49:
1.117 djm 50: char *sftp_realpath(const char *, char *); /* sftp-realpath.c */
51:
1.122 djm 52: /* Maximum data read that we are willing to accept */
1.124 djm 53: #define SFTP_MAX_READ_LENGTH (SFTP_MAX_MSG_LENGTH - 1024)
1.122 djm 54:
1.58 djm 55: /* Our verbosity */
1.98 djm 56: static LogLevel log_level = SYSLOG_LEVEL_ERROR;
1.58 djm 57:
58: /* Our client */
1.98 djm 59: static struct passwd *pw = NULL;
60: static char *client_addr = NULL;
1.1 markus 61:
62: /* input and output queue */
1.104 djm 63: struct sshbuf *iqueue;
64: struct sshbuf *oqueue;
1.1 markus 65:
1.23 djm 66: /* Version of client */
1.98 djm 67: static u_int version;
68:
69: /* SSH2_FXP_INIT received */
70: static int init_done;
1.23 djm 71:
1.90 djm 72: /* Disable writes */
1.98 djm 73: static int readonly;
74:
75: /* Requests that are allowed/denied */
1.118 djm 76: static char *request_allowlist, *request_denylist;
1.90 djm 77:
1.43 miod 78: /* portable attributes, etc. */
1.1 markus 79: typedef struct Stat Stat;
80:
1.15 djm 81: struct Stat {
1.1 markus 82: char *name;
83: char *long_name;
84: Attrib attrib;
85: };
86:
1.98 djm 87: /* Packet handlers */
88: static void process_open(u_int32_t id);
89: static void process_close(u_int32_t id);
90: static void process_read(u_int32_t id);
91: static void process_write(u_int32_t id);
92: static void process_stat(u_int32_t id);
93: static void process_lstat(u_int32_t id);
94: static void process_fstat(u_int32_t id);
95: static void process_setstat(u_int32_t id);
96: static void process_fsetstat(u_int32_t id);
97: static void process_opendir(u_int32_t id);
98: static void process_readdir(u_int32_t id);
99: static void process_remove(u_int32_t id);
100: static void process_mkdir(u_int32_t id);
101: static void process_rmdir(u_int32_t id);
102: static void process_realpath(u_int32_t id);
103: static void process_rename(u_int32_t id);
104: static void process_readlink(u_int32_t id);
105: static void process_symlink(u_int32_t id);
106: static void process_extended_posix_rename(u_int32_t id);
107: static void process_extended_statvfs(u_int32_t id);
108: static void process_extended_fstatvfs(u_int32_t id);
109: static void process_extended_hardlink(u_int32_t id);
1.102 djm 110: static void process_extended_fsync(u_int32_t id);
1.114 djm 111: static void process_extended_lsetstat(u_int32_t id);
1.122 djm 112: static void process_extended_limits(u_int32_t id);
1.129 djm 113: static void process_extended_expand(u_int32_t id);
1.140 djm 114: static void process_extended_copy_data(u_int32_t id);
1.141 djm 115: static void process_extended_home_directory(u_int32_t id);
1.143 ! djm 116: static void process_extended_get_users_groups_by_id(u_int32_t id);
1.98 djm 117: static void process_extended(u_int32_t id);
118:
119: struct sftp_handler {
120: const char *name; /* user-visible name for fine-grained perms */
121: const char *ext_name; /* extended request name */
122: u_int type; /* packet type, for non extended packets */
123: void (*handler)(u_int32_t);
124: int does_write; /* if nonzero, banned for readonly mode */
125: };
126:
1.113 djm 127: static const struct sftp_handler handlers[] = {
1.98 djm 128: /* NB. SSH2_FXP_OPEN does the readonly check in the handler itself */
129: { "open", NULL, SSH2_FXP_OPEN, process_open, 0 },
130: { "close", NULL, SSH2_FXP_CLOSE, process_close, 0 },
131: { "read", NULL, SSH2_FXP_READ, process_read, 0 },
132: { "write", NULL, SSH2_FXP_WRITE, process_write, 1 },
133: { "lstat", NULL, SSH2_FXP_LSTAT, process_lstat, 0 },
134: { "fstat", NULL, SSH2_FXP_FSTAT, process_fstat, 0 },
135: { "setstat", NULL, SSH2_FXP_SETSTAT, process_setstat, 1 },
136: { "fsetstat", NULL, SSH2_FXP_FSETSTAT, process_fsetstat, 1 },
137: { "opendir", NULL, SSH2_FXP_OPENDIR, process_opendir, 0 },
138: { "readdir", NULL, SSH2_FXP_READDIR, process_readdir, 0 },
139: { "remove", NULL, SSH2_FXP_REMOVE, process_remove, 1 },
140: { "mkdir", NULL, SSH2_FXP_MKDIR, process_mkdir, 1 },
141: { "rmdir", NULL, SSH2_FXP_RMDIR, process_rmdir, 1 },
142: { "realpath", NULL, SSH2_FXP_REALPATH, process_realpath, 0 },
143: { "stat", NULL, SSH2_FXP_STAT, process_stat, 0 },
144: { "rename", NULL, SSH2_FXP_RENAME, process_rename, 1 },
145: { "readlink", NULL, SSH2_FXP_READLINK, process_readlink, 0 },
146: { "symlink", NULL, SSH2_FXP_SYMLINK, process_symlink, 1 },
147: { NULL, NULL, 0, NULL, 0 }
148: };
149:
150: /* SSH2_FXP_EXTENDED submessages */
1.113 djm 151: static const struct sftp_handler extended_handlers[] = {
1.98 djm 152: { "posix-rename", "posix-rename@openssh.com", 0,
1.127 djm 153: process_extended_posix_rename, 1 },
1.98 djm 154: { "statvfs", "statvfs@openssh.com", 0, process_extended_statvfs, 0 },
155: { "fstatvfs", "fstatvfs@openssh.com", 0, process_extended_fstatvfs, 0 },
156: { "hardlink", "hardlink@openssh.com", 0, process_extended_hardlink, 1 },
1.102 djm 157: { "fsync", "fsync@openssh.com", 0, process_extended_fsync, 1 },
1.114 djm 158: { "lsetstat", "lsetstat@openssh.com", 0, process_extended_lsetstat, 1 },
1.128 djm 159: { "limits", "limits@openssh.com", 0, process_extended_limits, 0 },
1.129 djm 160: { "expand-path", "expand-path@openssh.com", 0,
161: process_extended_expand, 0 },
1.140 djm 162: { "copy-data", "copy-data", 0, process_extended_copy_data, 1 },
1.141 djm 163: { "home-directory", "home-directory", 0,
164: process_extended_home_directory, 0 },
1.143 ! djm 165: { "users-groups-by-id", "users-groups-by-id@openssh.com", 0,
! 166: process_extended_get_users_groups_by_id, 0 },
1.98 djm 167: { NULL, NULL, 0, NULL, 0 }
168: };
169:
1.125 djm 170: static const struct sftp_handler *
171: extended_handler_byname(const char *name)
172: {
173: int i;
174:
175: for (i = 0; extended_handlers[i].handler != NULL; i++) {
176: if (strcmp(name, extended_handlers[i].ext_name) == 0)
177: return &extended_handlers[i];
178: }
179: return NULL;
180: }
181:
1.98 djm 182: static int
1.113 djm 183: request_permitted(const struct sftp_handler *h)
1.98 djm 184: {
185: char *result;
186:
187: if (readonly && h->does_write) {
188: verbose("Refusing %s request in read-only mode", h->name);
189: return 0;
190: }
1.118 djm 191: if (request_denylist != NULL &&
192: ((result = match_list(h->name, request_denylist, NULL))) != NULL) {
1.98 djm 193: free(result);
1.118 djm 194: verbose("Refusing denylisted %s request", h->name);
1.98 djm 195: return 0;
196: }
1.118 djm 197: if (request_allowlist != NULL &&
198: ((result = match_list(h->name, request_allowlist, NULL))) != NULL) {
1.98 djm 199: free(result);
1.118 djm 200: debug2("Permitting allowlisted %s request", h->name);
1.98 djm 201: return 1;
202: }
1.118 djm 203: if (request_allowlist != NULL) {
204: verbose("Refusing non-allowlisted %s request", h->name);
1.98 djm 205: return 0;
206: }
207: return 1;
208: }
209:
1.28 itojun 210: static int
1.2 markus 211: errno_to_portable(int unixerrno)
1.1 markus 212: {
213: int ret = 0;
1.22 deraadt 214:
1.2 markus 215: switch (unixerrno) {
1.1 markus 216: case 0:
1.10 markus 217: ret = SSH2_FX_OK;
1.1 markus 218: break;
219: case ENOENT:
220: case ENOTDIR:
221: case EBADF:
222: case ELOOP:
1.10 markus 223: ret = SSH2_FX_NO_SUCH_FILE;
1.1 markus 224: break;
225: case EPERM:
226: case EACCES:
227: case EFAULT:
1.10 markus 228: ret = SSH2_FX_PERMISSION_DENIED;
1.1 markus 229: break;
230: case ENAMETOOLONG:
231: case EINVAL:
1.10 markus 232: ret = SSH2_FX_BAD_MESSAGE;
1.82 dtucker 233: break;
234: case ENOSYS:
235: ret = SSH2_FX_OP_UNSUPPORTED;
1.1 markus 236: break;
237: default:
1.10 markus 238: ret = SSH2_FX_FAILURE;
1.1 markus 239: break;
240: }
241: return ret;
242: }
243:
1.28 itojun 244: static int
1.1 markus 245: flags_from_portable(int pflags)
246: {
247: int flags = 0;
1.22 deraadt 248:
1.20 deraadt 249: if ((pflags & SSH2_FXF_READ) &&
250: (pflags & SSH2_FXF_WRITE)) {
1.1 markus 251: flags = O_RDWR;
1.10 markus 252: } else if (pflags & SSH2_FXF_READ) {
1.1 markus 253: flags = O_RDONLY;
1.10 markus 254: } else if (pflags & SSH2_FXF_WRITE) {
1.1 markus 255: flags = O_WRONLY;
256: }
1.101 djm 257: if (pflags & SSH2_FXF_APPEND)
258: flags |= O_APPEND;
1.10 markus 259: if (pflags & SSH2_FXF_CREAT)
1.1 markus 260: flags |= O_CREAT;
1.10 markus 261: if (pflags & SSH2_FXF_TRUNC)
1.1 markus 262: flags |= O_TRUNC;
1.10 markus 263: if (pflags & SSH2_FXF_EXCL)
1.1 markus 264: flags |= O_EXCL;
265: return flags;
266: }
267:
1.58 djm 268: static const char *
269: string_from_portable(int pflags)
270: {
271: static char ret[128];
272:
273: *ret = '\0';
274:
275: #define PAPPEND(str) { \
276: if (*ret != '\0') \
277: strlcat(ret, ",", sizeof(ret)); \
1.70 deraadt 278: strlcat(ret, str, sizeof(ret)); \
1.58 djm 279: }
280:
281: if (pflags & SSH2_FXF_READ)
282: PAPPEND("READ")
283: if (pflags & SSH2_FXF_WRITE)
284: PAPPEND("WRITE")
1.101 djm 285: if (pflags & SSH2_FXF_APPEND)
286: PAPPEND("APPEND")
1.58 djm 287: if (pflags & SSH2_FXF_CREAT)
288: PAPPEND("CREATE")
289: if (pflags & SSH2_FXF_TRUNC)
290: PAPPEND("TRUNCATE")
291: if (pflags & SSH2_FXF_EXCL)
292: PAPPEND("EXCL")
293:
294: return ret;
295: }
296:
1.1 markus 297: /* handle handles */
298:
299: typedef struct Handle Handle;
300: struct Handle {
301: int use;
302: DIR *dirp;
303: int fd;
1.101 djm 304: int flags;
1.1 markus 305: char *name;
1.58 djm 306: u_int64_t bytes_read, bytes_write;
1.75 djm 307: int next_unused;
1.1 markus 308: };
1.22 deraadt 309:
1.1 markus 310: enum {
311: HANDLE_UNUSED,
312: HANDLE_DIR,
313: HANDLE_FILE
314: };
1.22 deraadt 315:
1.113 djm 316: static Handle *handles = NULL;
317: static u_int num_handles = 0;
318: static int first_unused_handle = -1;
1.75 djm 319:
320: static void handle_unused(int i)
321: {
322: handles[i].use = HANDLE_UNUSED;
323: handles[i].next_unused = first_unused_handle;
324: first_unused_handle = i;
1.1 markus 325: }
326:
1.28 itojun 327: static int
1.101 djm 328: handle_new(int use, const char *name, int fd, int flags, DIR *dirp)
1.1 markus 329: {
1.75 djm 330: int i;
331:
332: if (first_unused_handle == -1) {
333: if (num_handles + 1 <= num_handles)
334: return -1;
335: num_handles++;
1.106 deraadt 336: handles = xreallocarray(handles, num_handles, sizeof(Handle));
1.75 djm 337: handle_unused(num_handles - 1);
338: }
339:
340: i = first_unused_handle;
341: first_unused_handle = handles[i].next_unused;
342:
343: handles[i].use = use;
344: handles[i].dirp = dirp;
345: handles[i].fd = fd;
1.101 djm 346: handles[i].flags = flags;
1.75 djm 347: handles[i].name = xstrdup(name);
348: handles[i].bytes_read = handles[i].bytes_write = 0;
1.22 deraadt 349:
1.75 djm 350: return i;
1.1 markus 351: }
352:
1.28 itojun 353: static int
1.1 markus 354: handle_is_ok(int i, int type)
355: {
1.75 djm 356: return i >= 0 && (u_int)i < num_handles && handles[i].use == type;
1.1 markus 357: }
358:
1.28 itojun 359: static int
1.104 djm 360: handle_to_string(int handle, u_char **stringp, int *hlenp)
1.1 markus 361: {
362: if (stringp == NULL || hlenp == NULL)
363: return -1;
1.13 markus 364: *stringp = xmalloc(sizeof(int32_t));
1.57 djm 365: put_u32(*stringp, handle);
1.13 markus 366: *hlenp = sizeof(int32_t);
1.1 markus 367: return 0;
368: }
369:
1.28 itojun 370: static int
1.104 djm 371: handle_from_string(const u_char *handle, u_int hlen)
1.1 markus 372: {
1.13 markus 373: int val;
1.22 deraadt 374:
1.13 markus 375: if (hlen != sizeof(int32_t))
1.1 markus 376: return -1;
1.57 djm 377: val = get_u32(handle);
1.1 markus 378: if (handle_is_ok(val, HANDLE_FILE) ||
379: handle_is_ok(val, HANDLE_DIR))
380: return val;
381: return -1;
382: }
383:
1.28 itojun 384: static char *
1.1 markus 385: handle_to_name(int handle)
386: {
387: if (handle_is_ok(handle, HANDLE_DIR)||
388: handle_is_ok(handle, HANDLE_FILE))
389: return handles[handle].name;
390: return NULL;
391: }
392:
1.28 itojun 393: static DIR *
1.1 markus 394: handle_to_dir(int handle)
395: {
396: if (handle_is_ok(handle, HANDLE_DIR))
397: return handles[handle].dirp;
398: return NULL;
399: }
400:
1.28 itojun 401: static int
1.1 markus 402: handle_to_fd(int handle)
403: {
1.17 stevesk 404: if (handle_is_ok(handle, HANDLE_FILE))
1.1 markus 405: return handles[handle].fd;
406: return -1;
407: }
408:
1.101 djm 409: static int
410: handle_to_flags(int handle)
411: {
412: if (handle_is_ok(handle, HANDLE_FILE))
413: return handles[handle].flags;
414: return 0;
415: }
416:
1.58 djm 417: static void
418: handle_update_read(int handle, ssize_t bytes)
419: {
420: if (handle_is_ok(handle, HANDLE_FILE) && bytes > 0)
421: handles[handle].bytes_read += bytes;
422: }
423:
424: static void
425: handle_update_write(int handle, ssize_t bytes)
426: {
427: if (handle_is_ok(handle, HANDLE_FILE) && bytes > 0)
428: handles[handle].bytes_write += bytes;
429: }
430:
431: static u_int64_t
432: handle_bytes_read(int handle)
433: {
434: if (handle_is_ok(handle, HANDLE_FILE))
435: return (handles[handle].bytes_read);
436: return 0;
437: }
438:
439: static u_int64_t
440: handle_bytes_write(int handle)
441: {
442: if (handle_is_ok(handle, HANDLE_FILE))
443: return (handles[handle].bytes_write);
444: return 0;
445: }
446:
1.28 itojun 447: static int
1.1 markus 448: handle_close(int handle)
449: {
450: int ret = -1;
1.22 deraadt 451:
1.1 markus 452: if (handle_is_ok(handle, HANDLE_FILE)) {
453: ret = close(handles[handle].fd);
1.97 djm 454: free(handles[handle].name);
1.75 djm 455: handle_unused(handle);
1.1 markus 456: } else if (handle_is_ok(handle, HANDLE_DIR)) {
457: ret = closedir(handles[handle].dirp);
1.97 djm 458: free(handles[handle].name);
1.75 djm 459: handle_unused(handle);
1.1 markus 460: } else {
461: errno = ENOENT;
462: }
463: return ret;
464: }
465:
1.58 djm 466: static void
467: handle_log_close(int handle, char *emsg)
468: {
469: if (handle_is_ok(handle, HANDLE_FILE)) {
470: logit("%s%sclose \"%s\" bytes read %llu written %llu",
471: emsg == NULL ? "" : emsg, emsg == NULL ? "" : " ",
472: handle_to_name(handle),
1.72 stevesk 473: (unsigned long long)handle_bytes_read(handle),
474: (unsigned long long)handle_bytes_write(handle));
1.58 djm 475: } else {
476: logit("%s%sclosedir \"%s\"",
477: emsg == NULL ? "" : emsg, emsg == NULL ? "" : " ",
478: handle_to_name(handle));
479: }
480: }
481:
482: static void
483: handle_log_exit(void)
484: {
485: u_int i;
486:
1.75 djm 487: for (i = 0; i < num_handles; i++)
1.58 djm 488: if (handles[i].use != HANDLE_UNUSED)
489: handle_log_close(i, "forced");
490: }
491:
1.28 itojun 492: static int
1.104 djm 493: get_handle(struct sshbuf *queue, int *hp)
1.1 markus 494: {
1.104 djm 495: u_char *handle;
496: int r;
497: size_t hlen;
498:
499: *hp = -1;
500: if ((r = sshbuf_get_string(queue, &handle, &hlen)) != 0)
501: return r;
1.10 markus 502: if (hlen < 256)
1.104 djm 503: *hp = handle_from_string(handle, hlen);
1.97 djm 504: free(handle);
1.104 djm 505: return 0;
1.1 markus 506: }
507:
508: /* send replies */
509:
1.28 itojun 510: static void
1.104 djm 511: send_msg(struct sshbuf *m)
1.1 markus 512: {
1.104 djm 513: int r;
1.22 deraadt 514:
1.104 djm 515: if ((r = sshbuf_put_stringb(oqueue, m)) != 0)
1.120 djm 516: fatal_fr(r, "enqueue");
1.104 djm 517: sshbuf_reset(m);
1.1 markus 518: }
519:
1.58 djm 520: static const char *
521: status_to_message(u_int32_t status)
1.1 markus 522: {
1.139 djm 523: static const char * const status_messages[] = {
1.23 djm 524: "Success", /* SSH_FX_OK */
525: "End of file", /* SSH_FX_EOF */
526: "No such file", /* SSH_FX_NO_SUCH_FILE */
527: "Permission denied", /* SSH_FX_PERMISSION_DENIED */
528: "Failure", /* SSH_FX_FAILURE */
529: "Bad message", /* SSH_FX_BAD_MESSAGE */
530: "No connection", /* SSH_FX_NO_CONNECTION */
531: "Connection lost", /* SSH_FX_CONNECTION_LOST */
532: "Operation unsupported", /* SSH_FX_OP_UNSUPPORTED */
533: "Unknown error" /* Others */
534: };
1.110 deraadt 535: return (status_messages[MINIMUM(status,SSH2_FX_MAX)]);
1.58 djm 536: }
1.22 deraadt 537:
1.58 djm 538: static void
1.136 djm 539: send_status_errmsg(u_int32_t id, u_int32_t status, const char *errmsg)
1.58 djm 540: {
1.104 djm 541: struct sshbuf *msg;
542: int r;
1.58 djm 543:
544: debug3("request %u: sent status %u", id, status);
545: if (log_level > SYSLOG_LEVEL_VERBOSE ||
546: (status != SSH2_FX_OK && status != SSH2_FX_EOF))
547: logit("sent status %s", status_to_message(status));
1.104 djm 548: if ((msg = sshbuf_new()) == NULL)
1.120 djm 549: fatal_f("sshbuf_new failed");
1.104 djm 550: if ((r = sshbuf_put_u8(msg, SSH2_FXP_STATUS)) != 0 ||
551: (r = sshbuf_put_u32(msg, id)) != 0 ||
552: (r = sshbuf_put_u32(msg, status)) != 0)
1.120 djm 553: fatal_fr(r, "compose");
1.23 djm 554: if (version >= 3) {
1.136 djm 555: if ((r = sshbuf_put_cstring(msg, errmsg == NULL ?
556: status_to_message(status) : errmsg)) != 0 ||
1.104 djm 557: (r = sshbuf_put_cstring(msg, "")) != 0)
1.120 djm 558: fatal_fr(r, "compose message");
1.23 djm 559: }
1.104 djm 560: send_msg(msg);
561: sshbuf_free(msg);
1.1 markus 562: }
1.136 djm 563:
564: static void
565: send_status(u_int32_t id, u_int32_t status)
566: {
1.137 dtucker 567: send_status_errmsg(id, status, NULL);
1.136 djm 568: }
569:
1.28 itojun 570: static void
1.104 djm 571: send_data_or_handle(char type, u_int32_t id, const u_char *data, int dlen)
1.1 markus 572: {
1.104 djm 573: struct sshbuf *msg;
574: int r;
1.22 deraadt 575:
1.104 djm 576: if ((msg = sshbuf_new()) == NULL)
1.120 djm 577: fatal_f("sshbuf_new failed");
1.104 djm 578: if ((r = sshbuf_put_u8(msg, type)) != 0 ||
579: (r = sshbuf_put_u32(msg, id)) != 0 ||
580: (r = sshbuf_put_string(msg, data, dlen)) != 0)
1.120 djm 581: fatal_fr(r, "compose");
1.104 djm 582: send_msg(msg);
583: sshbuf_free(msg);
1.1 markus 584: }
585:
1.28 itojun 586: static void
1.104 djm 587: send_data(u_int32_t id, const u_char *data, int dlen)
1.1 markus 588: {
1.58 djm 589: debug("request %u: sent data len %d", id, dlen);
1.10 markus 590: send_data_or_handle(SSH2_FXP_DATA, id, data, dlen);
1.1 markus 591: }
592:
1.28 itojun 593: static void
1.1 markus 594: send_handle(u_int32_t id, int handle)
595: {
1.104 djm 596: u_char *string;
1.1 markus 597: int hlen;
1.22 deraadt 598:
1.1 markus 599: handle_to_string(handle, &string, &hlen);
1.58 djm 600: debug("request %u: sent handle handle %d", id, handle);
1.10 markus 601: send_data_or_handle(SSH2_FXP_HANDLE, id, string, hlen);
1.97 djm 602: free(string);
1.1 markus 603: }
604:
1.28 itojun 605: static void
1.44 jakob 606: send_names(u_int32_t id, int count, const Stat *stats)
1.1 markus 607: {
1.104 djm 608: struct sshbuf *msg;
609: int i, r;
1.22 deraadt 610:
1.104 djm 611: if ((msg = sshbuf_new()) == NULL)
1.120 djm 612: fatal_f("sshbuf_new failed");
1.104 djm 613: if ((r = sshbuf_put_u8(msg, SSH2_FXP_NAME)) != 0 ||
614: (r = sshbuf_put_u32(msg, id)) != 0 ||
615: (r = sshbuf_put_u32(msg, count)) != 0)
1.120 djm 616: fatal_fr(r, "compose");
1.58 djm 617: debug("request %u: sent names count %d", id, count);
1.1 markus 618: for (i = 0; i < count; i++) {
1.104 djm 619: if ((r = sshbuf_put_cstring(msg, stats[i].name)) != 0 ||
620: (r = sshbuf_put_cstring(msg, stats[i].long_name)) != 0 ||
621: (r = encode_attrib(msg, &stats[i].attrib)) != 0)
1.120 djm 622: fatal_fr(r, "compose filenames/attrib");
1.1 markus 623: }
1.104 djm 624: send_msg(msg);
625: sshbuf_free(msg);
1.1 markus 626: }
627:
1.28 itojun 628: static void
1.44 jakob 629: send_attrib(u_int32_t id, const Attrib *a)
1.1 markus 630: {
1.104 djm 631: struct sshbuf *msg;
632: int r;
1.22 deraadt 633:
1.58 djm 634: debug("request %u: sent attrib have 0x%x", id, a->flags);
1.104 djm 635: if ((msg = sshbuf_new()) == NULL)
1.120 djm 636: fatal_f("sshbuf_new failed");
1.104 djm 637: if ((r = sshbuf_put_u8(msg, SSH2_FXP_ATTRS)) != 0 ||
638: (r = sshbuf_put_u32(msg, id)) != 0 ||
639: (r = encode_attrib(msg, a)) != 0)
1.120 djm 640: fatal_fr(r, "compose");
1.104 djm 641: send_msg(msg);
642: sshbuf_free(msg);
1.1 markus 643: }
644:
1.79 djm 645: static void
646: send_statvfs(u_int32_t id, struct statvfs *st)
647: {
1.104 djm 648: struct sshbuf *msg;
1.79 djm 649: u_int64_t flag;
1.104 djm 650: int r;
1.79 djm 651:
652: flag = (st->f_flag & ST_RDONLY) ? SSH2_FXE_STATVFS_ST_RDONLY : 0;
653: flag |= (st->f_flag & ST_NOSUID) ? SSH2_FXE_STATVFS_ST_NOSUID : 0;
654:
1.104 djm 655: if ((msg = sshbuf_new()) == NULL)
1.120 djm 656: fatal_f("sshbuf_new failed");
1.104 djm 657: if ((r = sshbuf_put_u8(msg, SSH2_FXP_EXTENDED_REPLY)) != 0 ||
658: (r = sshbuf_put_u32(msg, id)) != 0 ||
659: (r = sshbuf_put_u64(msg, st->f_bsize)) != 0 ||
660: (r = sshbuf_put_u64(msg, st->f_frsize)) != 0 ||
661: (r = sshbuf_put_u64(msg, st->f_blocks)) != 0 ||
662: (r = sshbuf_put_u64(msg, st->f_bfree)) != 0 ||
663: (r = sshbuf_put_u64(msg, st->f_bavail)) != 0 ||
664: (r = sshbuf_put_u64(msg, st->f_files)) != 0 ||
665: (r = sshbuf_put_u64(msg, st->f_ffree)) != 0 ||
666: (r = sshbuf_put_u64(msg, st->f_favail)) != 0 ||
667: (r = sshbuf_put_u64(msg, st->f_fsid)) != 0 ||
668: (r = sshbuf_put_u64(msg, flag)) != 0 ||
669: (r = sshbuf_put_u64(msg, st->f_namemax)) != 0)
1.120 djm 670: fatal_fr(r, "compose");
1.104 djm 671: send_msg(msg);
672: sshbuf_free(msg);
1.79 djm 673: }
674:
1.125 djm 675: /*
676: * Prepare SSH2_FXP_VERSION extension advertisement for a single extension.
1.135 jsg 677: * The extension is checked for permission prior to advertisement.
1.125 djm 678: */
679: static int
680: compose_extension(struct sshbuf *msg, const char *name, const char *ver)
681: {
682: int r;
683: const struct sftp_handler *exthnd;
684:
685: if ((exthnd = extended_handler_byname(name)) == NULL)
686: fatal_f("internal error: no handler for %s", name);
687: if (!request_permitted(exthnd)) {
688: debug2_f("refusing to advertise disallowed extension %s", name);
689: return 0;
690: }
691: if ((r = sshbuf_put_cstring(msg, name)) != 0 ||
692: (r = sshbuf_put_cstring(msg, ver)) != 0)
693: fatal_fr(r, "compose %s", name);
694: return 0;
695: }
696:
1.1 markus 697: /* parse incoming */
698:
1.28 itojun 699: static void
1.1 markus 700: process_init(void)
701: {
1.104 djm 702: struct sshbuf *msg;
703: int r;
1.1 markus 704:
1.104 djm 705: if ((r = sshbuf_get_u32(iqueue, &version)) != 0)
1.120 djm 706: fatal_fr(r, "parse");
1.94 djm 707: verbose("received client version %u", version);
1.104 djm 708: if ((msg = sshbuf_new()) == NULL)
1.120 djm 709: fatal_f("sshbuf_new failed");
1.104 djm 710: if ((r = sshbuf_put_u8(msg, SSH2_FXP_VERSION)) != 0 ||
1.125 djm 711: (r = sshbuf_put_u32(msg, SSH2_FILEXFER_VERSION)) != 0)
1.120 djm 712: fatal_fr(r, "compose");
1.125 djm 713:
1.135 jsg 714: /* extension advertisements */
1.125 djm 715: compose_extension(msg, "posix-rename@openssh.com", "1");
716: compose_extension(msg, "statvfs@openssh.com", "2");
717: compose_extension(msg, "fstatvfs@openssh.com", "2");
718: compose_extension(msg, "hardlink@openssh.com", "1");
719: compose_extension(msg, "fsync@openssh.com", "1");
720: compose_extension(msg, "lsetstat@openssh.com", "1");
721: compose_extension(msg, "limits@openssh.com", "1");
1.129 djm 722: compose_extension(msg, "expand-path@openssh.com", "1");
1.140 djm 723: compose_extension(msg, "copy-data", "1");
1.141 djm 724: compose_extension(msg, "home-directory", "1");
1.143 ! djm 725: compose_extension(msg, "users-groups-by-id@openssh.com", "1");
1.125 djm 726:
1.104 djm 727: send_msg(msg);
728: sshbuf_free(msg);
1.1 markus 729: }
730:
1.28 itojun 731: static void
1.98 djm 732: process_open(u_int32_t id)
1.1 markus 733: {
1.98 djm 734: u_int32_t pflags;
1.104 djm 735: Attrib a;
1.1 markus 736: char *name;
1.104 djm 737: int r, handle, fd, flags, mode, status = SSH2_FX_FAILURE;
738:
739: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0 ||
740: (r = sshbuf_get_u32(iqueue, &pflags)) != 0 || /* portable flags */
741: (r = decode_attrib(iqueue, &a)) != 0)
1.120 djm 742: fatal_fr(r, "parse");
1.1 markus 743:
1.61 djm 744: debug3("request %u: open flags %d", id, pflags);
1.1 markus 745: flags = flags_from_portable(pflags);
1.104 djm 746: mode = (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ? a.perm : 0666;
1.58 djm 747: logit("open \"%s\" flags %s mode 0%o",
748: name, string_from_portable(pflags), mode);
1.90 djm 749: if (readonly &&
1.111 djm 750: ((flags & O_ACCMODE) != O_RDONLY ||
751: (flags & (O_CREAT|O_TRUNC)) != 0)) {
1.98 djm 752: verbose("Refusing open request in read-only mode");
1.104 djm 753: status = SSH2_FX_PERMISSION_DENIED;
1.98 djm 754: } else {
1.90 djm 755: fd = open(name, flags, mode);
1.116 deraadt 756: if (fd == -1) {
1.90 djm 757: status = errno_to_portable(errno);
1.1 markus 758: } else {
1.101 djm 759: handle = handle_new(HANDLE_FILE, name, fd, flags, NULL);
1.90 djm 760: if (handle < 0) {
761: close(fd);
762: } else {
763: send_handle(id, handle);
764: status = SSH2_FX_OK;
765: }
1.1 markus 766: }
767: }
1.10 markus 768: if (status != SSH2_FX_OK)
1.1 markus 769: send_status(id, status);
1.97 djm 770: free(name);
1.1 markus 771: }
772:
1.28 itojun 773: static void
1.98 djm 774: process_close(u_int32_t id)
1.1 markus 775: {
1.104 djm 776: int r, handle, ret, status = SSH2_FX_FAILURE;
777:
778: if ((r = get_handle(iqueue, &handle)) != 0)
1.120 djm 779: fatal_fr(r, "parse");
1.1 markus 780:
1.58 djm 781: debug3("request %u: close handle %u", id, handle);
782: handle_log_close(handle, NULL);
1.1 markus 783: ret = handle_close(handle);
1.10 markus 784: status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.1 markus 785: send_status(id, status);
786: }
787:
1.28 itojun 788: static void
1.98 djm 789: process_read(u_int32_t id)
1.1 markus 790: {
1.124 djm 791: static u_char *buf;
792: static size_t buflen;
1.98 djm 793: u_int32_t len;
1.104 djm 794: int r, handle, fd, ret, status = SSH2_FX_FAILURE;
1.1 markus 795: u_int64_t off;
796:
1.104 djm 797: if ((r = get_handle(iqueue, &handle)) != 0 ||
798: (r = sshbuf_get_u64(iqueue, &off)) != 0 ||
799: (r = sshbuf_get_u32(iqueue, &len)) != 0)
1.120 djm 800: fatal_fr(r, "parse");
1.1 markus 801:
1.124 djm 802: debug("request %u: read \"%s\" (handle %d) off %llu len %u",
1.58 djm 803: id, handle_to_name(handle), handle, (unsigned long long)off, len);
1.124 djm 804: if ((fd = handle_to_fd(handle)) == -1)
805: goto out;
806: if (len > SFTP_MAX_READ_LENGTH) {
807: debug2("read change len %u to %u", len, SFTP_MAX_READ_LENGTH);
808: len = SFTP_MAX_READ_LENGTH;
809: }
810: if (len > buflen) {
811: debug3_f("allocate %zu => %u", buflen, len);
812: if ((buf = realloc(NULL, len)) == NULL)
813: fatal_f("realloc failed");
814: buflen = len;
815: }
816: if (lseek(fd, off, SEEK_SET) == -1) {
817: status = errno_to_portable(errno);
818: error_f("seek \"%.100s\": %s", handle_to_name(handle),
819: strerror(errno));
820: goto out;
821: }
822: if (len == 0) {
823: /* weird, but not strictly disallowed */
824: ret = 0;
825: } else if ((ret = read(fd, buf, len)) == -1) {
826: status = errno_to_portable(errno);
827: error_f("read \"%.100s\": %s", handle_to_name(handle),
828: strerror(errno));
829: goto out;
830: } else if (ret == 0) {
831: status = SSH2_FX_EOF;
832: goto out;
833: }
834: send_data(id, buf, ret);
835: handle_update_read(handle, ret);
836: /* success */
837: status = SSH2_FX_OK;
838: out:
1.10 markus 839: if (status != SSH2_FX_OK)
1.1 markus 840: send_status(id, status);
841: }
842:
1.28 itojun 843: static void
1.98 djm 844: process_write(u_int32_t id)
1.1 markus 845: {
846: u_int64_t off;
1.104 djm 847: size_t len;
848: int r, handle, fd, ret, status;
849: u_char *data;
850:
851: if ((r = get_handle(iqueue, &handle)) != 0 ||
852: (r = sshbuf_get_u64(iqueue, &off)) != 0 ||
853: (r = sshbuf_get_string(iqueue, &data, &len)) != 0)
1.120 djm 854: fatal_fr(r, "parse");
1.1 markus 855:
1.104 djm 856: debug("request %u: write \"%s\" (handle %d) off %llu len %zu",
1.58 djm 857: id, handle_to_name(handle), handle, (unsigned long long)off, len);
1.1 markus 858: fd = handle_to_fd(handle);
1.104 djm 859:
1.90 djm 860: if (fd < 0)
861: status = SSH2_FX_FAILURE;
862: else {
1.101 djm 863: if (!(handle_to_flags(handle) & O_APPEND) &&
1.123 djm 864: lseek(fd, off, SEEK_SET) == -1) {
1.1 markus 865: status = errno_to_portable(errno);
1.123 djm 866: error_f("seek \"%.100s\": %s", handle_to_name(handle),
867: strerror(errno));
1.1 markus 868: } else {
869: /* XXX ATOMICIO ? */
870: ret = write(fd, data, len);
1.116 deraadt 871: if (ret == -1) {
1.1 markus 872: status = errno_to_portable(errno);
1.123 djm 873: error_f("write \"%.100s\": %s",
874: handle_to_name(handle), strerror(errno));
1.48 djm 875: } else if ((size_t)ret == len) {
1.10 markus 876: status = SSH2_FX_OK;
1.58 djm 877: handle_update_write(handle, ret);
1.1 markus 878: } else {
1.120 djm 879: debug2_f("nothing at all written");
1.90 djm 880: status = SSH2_FX_FAILURE;
1.1 markus 881: }
882: }
883: }
884: send_status(id, status);
1.97 djm 885: free(data);
1.1 markus 886: }
887:
1.28 itojun 888: static void
1.98 djm 889: process_do_stat(u_int32_t id, int do_lstat)
1.1 markus 890: {
1.13 markus 891: Attrib a;
1.1 markus 892: struct stat st;
893: char *name;
1.104 djm 894: int r, status = SSH2_FX_FAILURE;
895:
896: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0)
1.120 djm 897: fatal_fr(r, "parse");
1.1 markus 898:
1.58 djm 899: debug3("request %u: %sstat", id, do_lstat ? "l" : "");
900: verbose("%sstat name \"%s\"", do_lstat ? "l" : "", name);
1.104 djm 901: r = do_lstat ? lstat(name, &st) : stat(name, &st);
1.116 deraadt 902: if (r == -1) {
1.1 markus 903: status = errno_to_portable(errno);
904: } else {
1.13 markus 905: stat_to_attrib(&st, &a);
906: send_attrib(id, &a);
1.10 markus 907: status = SSH2_FX_OK;
1.1 markus 908: }
1.10 markus 909: if (status != SSH2_FX_OK)
1.1 markus 910: send_status(id, status);
1.97 djm 911: free(name);
1.1 markus 912: }
913:
1.28 itojun 914: static void
1.98 djm 915: process_stat(u_int32_t id)
1.1 markus 916: {
1.98 djm 917: process_do_stat(id, 0);
1.1 markus 918: }
919:
1.28 itojun 920: static void
1.98 djm 921: process_lstat(u_int32_t id)
1.1 markus 922: {
1.98 djm 923: process_do_stat(id, 1);
1.1 markus 924: }
925:
1.28 itojun 926: static void
1.98 djm 927: process_fstat(u_int32_t id)
1.1 markus 928: {
1.13 markus 929: Attrib a;
1.1 markus 930: struct stat st;
1.104 djm 931: int fd, r, handle, status = SSH2_FX_FAILURE;
1.1 markus 932:
1.104 djm 933: if ((r = get_handle(iqueue, &handle)) != 0)
1.120 djm 934: fatal_fr(r, "parse");
1.58 djm 935: debug("request %u: fstat \"%s\" (handle %u)",
936: id, handle_to_name(handle), handle);
1.1 markus 937: fd = handle_to_fd(handle);
1.71 stevesk 938: if (fd >= 0) {
1.104 djm 939: r = fstat(fd, &st);
1.116 deraadt 940: if (r == -1) {
1.1 markus 941: status = errno_to_portable(errno);
942: } else {
1.13 markus 943: stat_to_attrib(&st, &a);
944: send_attrib(id, &a);
1.10 markus 945: status = SSH2_FX_OK;
1.1 markus 946: }
947: }
1.10 markus 948: if (status != SSH2_FX_OK)
1.1 markus 949: send_status(id, status);
950: }
951:
1.28 itojun 952: static struct timeval *
1.44 jakob 953: attrib_to_tv(const Attrib *a)
1.1 markus 954: {
955: static struct timeval tv[2];
1.22 deraadt 956:
1.1 markus 957: tv[0].tv_sec = a->atime;
958: tv[0].tv_usec = 0;
959: tv[1].tv_sec = a->mtime;
960: tv[1].tv_usec = 0;
961: return tv;
962: }
963:
1.114 djm 964: static struct timespec *
965: attrib_to_ts(const Attrib *a)
966: {
967: static struct timespec ts[2];
968:
969: ts[0].tv_sec = a->atime;
970: ts[0].tv_nsec = 0;
971: ts[1].tv_sec = a->mtime;
972: ts[1].tv_nsec = 0;
973: return ts;
974: }
975:
1.28 itojun 976: static void
1.98 djm 977: process_setstat(u_int32_t id)
1.1 markus 978: {
1.104 djm 979: Attrib a;
1.1 markus 980: char *name;
1.104 djm 981: int r, status = SSH2_FX_OK;
982:
983: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0 ||
984: (r = decode_attrib(iqueue, &a)) != 0)
1.120 djm 985: fatal_fr(r, "parse");
1.1 markus 986:
1.58 djm 987: debug("request %u: setstat name \"%s\"", id, name);
1.104 djm 988: if (a.flags & SSH2_FILEXFER_ATTR_SIZE) {
1.72 stevesk 989: logit("set \"%s\" size %llu",
1.104 djm 990: name, (unsigned long long)a.size);
991: r = truncate(name, a.size);
992: if (r == -1)
1.33 markus 993: status = errno_to_portable(errno);
994: }
1.104 djm 995: if (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
996: logit("set \"%s\" mode %04o", name, a.perm);
997: r = chmod(name, a.perm & 07777);
998: if (r == -1)
1.1 markus 999: status = errno_to_portable(errno);
1000: }
1.104 djm 1001: if (a.flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
1.58 djm 1002: char buf[64];
1.104 djm 1003: time_t t = a.mtime;
1.58 djm 1004:
1005: strftime(buf, sizeof(buf), "%Y%m%d-%H:%M:%S",
1006: localtime(&t));
1007: logit("set \"%s\" modtime %s", name, buf);
1.104 djm 1008: r = utimes(name, attrib_to_tv(&a));
1009: if (r == -1)
1.1 markus 1010: status = errno_to_portable(errno);
1011: }
1.104 djm 1012: if (a.flags & SSH2_FILEXFER_ATTR_UIDGID) {
1.58 djm 1013: logit("set \"%s\" owner %lu group %lu", name,
1.104 djm 1014: (u_long)a.uid, (u_long)a.gid);
1015: r = chown(name, a.uid, a.gid);
1016: if (r == -1)
1.18 stevesk 1017: status = errno_to_portable(errno);
1018: }
1.1 markus 1019: send_status(id, status);
1.97 djm 1020: free(name);
1.1 markus 1021: }
1022:
1.28 itojun 1023: static void
1.98 djm 1024: process_fsetstat(u_int32_t id)
1.1 markus 1025: {
1.104 djm 1026: Attrib a;
1027: int handle, fd, r;
1.10 markus 1028: int status = SSH2_FX_OK;
1.1 markus 1029:
1.104 djm 1030: if ((r = get_handle(iqueue, &handle)) != 0 ||
1031: (r = decode_attrib(iqueue, &a)) != 0)
1.120 djm 1032: fatal_fr(r, "parse");
1.104 djm 1033:
1.58 djm 1034: debug("request %u: fsetstat handle %d", id, handle);
1.1 markus 1035: fd = handle_to_fd(handle);
1.90 djm 1036: if (fd < 0)
1.10 markus 1037: status = SSH2_FX_FAILURE;
1.90 djm 1038: else {
1.58 djm 1039: char *name = handle_to_name(handle);
1040:
1.104 djm 1041: if (a.flags & SSH2_FILEXFER_ATTR_SIZE) {
1.72 stevesk 1042: logit("set \"%s\" size %llu",
1.104 djm 1043: name, (unsigned long long)a.size);
1044: r = ftruncate(fd, a.size);
1045: if (r == -1)
1.33 markus 1046: status = errno_to_portable(errno);
1047: }
1.104 djm 1048: if (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
1049: logit("set \"%s\" mode %04o", name, a.perm);
1050: r = fchmod(fd, a.perm & 07777);
1051: if (r == -1)
1.1 markus 1052: status = errno_to_portable(errno);
1053: }
1.104 djm 1054: if (a.flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
1.58 djm 1055: char buf[64];
1.104 djm 1056: time_t t = a.mtime;
1.58 djm 1057:
1058: strftime(buf, sizeof(buf), "%Y%m%d-%H:%M:%S",
1059: localtime(&t));
1060: logit("set \"%s\" modtime %s", name, buf);
1.104 djm 1061: r = futimes(fd, attrib_to_tv(&a));
1062: if (r == -1)
1.18 stevesk 1063: status = errno_to_portable(errno);
1064: }
1.104 djm 1065: if (a.flags & SSH2_FILEXFER_ATTR_UIDGID) {
1.58 djm 1066: logit("set \"%s\" owner %lu group %lu", name,
1.104 djm 1067: (u_long)a.uid, (u_long)a.gid);
1068: r = fchown(fd, a.uid, a.gid);
1069: if (r == -1)
1.1 markus 1070: status = errno_to_portable(errno);
1071: }
1072: }
1073: send_status(id, status);
1074: }
1075:
1.28 itojun 1076: static void
1.98 djm 1077: process_opendir(u_int32_t id)
1.1 markus 1078: {
1079: DIR *dirp = NULL;
1080: char *path;
1.104 djm 1081: int r, handle, status = SSH2_FX_FAILURE;
1082:
1083: if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
1.120 djm 1084: fatal_fr(r, "parse");
1.1 markus 1085:
1.58 djm 1086: debug3("request %u: opendir", id);
1087: logit("opendir \"%s\"", path);
1.17 stevesk 1088: dirp = opendir(path);
1.1 markus 1089: if (dirp == NULL) {
1090: status = errno_to_portable(errno);
1091: } else {
1.101 djm 1092: handle = handle_new(HANDLE_DIR, path, 0, 0, dirp);
1.1 markus 1093: if (handle < 0) {
1094: closedir(dirp);
1095: } else {
1096: send_handle(id, handle);
1.10 markus 1097: status = SSH2_FX_OK;
1.1 markus 1098: }
1.17 stevesk 1099:
1.1 markus 1100: }
1.10 markus 1101: if (status != SSH2_FX_OK)
1.1 markus 1102: send_status(id, status);
1.97 djm 1103: free(path);
1.1 markus 1104: }
1105:
1.28 itojun 1106: static void
1.98 djm 1107: process_readdir(u_int32_t id)
1.1 markus 1108: {
1109: DIR *dirp;
1110: struct dirent *dp;
1111: char *path;
1.104 djm 1112: int r, handle;
1113:
1114: if ((r = get_handle(iqueue, &handle)) != 0)
1.120 djm 1115: fatal_fr(r, "parse");
1.1 markus 1116:
1.58 djm 1117: debug("request %u: readdir \"%s\" (handle %d)", id,
1118: handle_to_name(handle), handle);
1.1 markus 1119: dirp = handle_to_dir(handle);
1120: path = handle_to_name(handle);
1121: if (dirp == NULL || path == NULL) {
1.10 markus 1122: send_status(id, SSH2_FX_FAILURE);
1.1 markus 1123: } else {
1124: struct stat st;
1.105 deraadt 1125: char pathname[PATH_MAX];
1.1 markus 1126: Stat *stats;
1127: int nstats = 10, count = 0, i;
1.36 deraadt 1128:
1.54 djm 1129: stats = xcalloc(nstats, sizeof(Stat));
1.1 markus 1130: while ((dp = readdir(dirp)) != NULL) {
1131: if (count >= nstats) {
1132: nstats *= 2;
1.106 deraadt 1133: stats = xreallocarray(stats, nstats, sizeof(Stat));
1.1 markus 1134: }
1135: /* XXX OVERFLOW ? */
1.30 jakob 1136: snprintf(pathname, sizeof pathname, "%s%s%s", path,
1137: strcmp(path, "/") ? "/" : "", dp->d_name);
1.116 deraadt 1138: if (lstat(pathname, &st) == -1)
1.1 markus 1139: continue;
1.13 markus 1140: stat_to_attrib(&st, &(stats[count].attrib));
1.1 markus 1141: stats[count].name = xstrdup(dp->d_name);
1.91 djm 1142: stats[count].long_name = ls_file(dp->d_name, &st, 0, 0);
1.1 markus 1143: count++;
1144: /* send up to 100 entries in one message */
1.11 markus 1145: /* XXX check packet size instead */
1.1 markus 1146: if (count == 100)
1147: break;
1148: }
1.10 markus 1149: if (count > 0) {
1150: send_names(id, count, stats);
1.31 deraadt 1151: for (i = 0; i < count; i++) {
1.97 djm 1152: free(stats[i].name);
1153: free(stats[i].long_name);
1.10 markus 1154: }
1155: } else {
1156: send_status(id, SSH2_FX_EOF);
1.1 markus 1157: }
1.97 djm 1158: free(stats);
1.1 markus 1159: }
1160: }
1161:
1.28 itojun 1162: static void
1.98 djm 1163: process_remove(u_int32_t id)
1.1 markus 1164: {
1165: char *name;
1.104 djm 1166: int r, status = SSH2_FX_FAILURE;
1167:
1168: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0)
1.120 djm 1169: fatal_fr(r, "parse");
1.1 markus 1170:
1.58 djm 1171: debug3("request %u: remove", id);
1172: logit("remove name \"%s\"", name);
1.104 djm 1173: r = unlink(name);
1174: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.1 markus 1175: send_status(id, status);
1.97 djm 1176: free(name);
1.1 markus 1177: }
1178:
1.28 itojun 1179: static void
1.98 djm 1180: process_mkdir(u_int32_t id)
1.1 markus 1181: {
1.104 djm 1182: Attrib a;
1.1 markus 1183: char *name;
1.104 djm 1184: int r, mode, status = SSH2_FX_FAILURE;
1185:
1186: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0 ||
1187: (r = decode_attrib(iqueue, &a)) != 0)
1.120 djm 1188: fatal_fr(r, "parse");
1.1 markus 1189:
1.104 djm 1190: mode = (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ?
1191: a.perm & 07777 : 0777;
1.58 djm 1192: debug3("request %u: mkdir", id);
1193: logit("mkdir name \"%s\" mode 0%o", name, mode);
1.104 djm 1194: r = mkdir(name, mode);
1195: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.1 markus 1196: send_status(id, status);
1.97 djm 1197: free(name);
1.1 markus 1198: }
1199:
1.28 itojun 1200: static void
1.98 djm 1201: process_rmdir(u_int32_t id)
1.1 markus 1202: {
1203: char *name;
1.104 djm 1204: int r, status;
1205:
1206: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0)
1.120 djm 1207: fatal_fr(r, "parse");
1.1 markus 1208:
1.58 djm 1209: debug3("request %u: rmdir", id);
1210: logit("rmdir name \"%s\"", name);
1.104 djm 1211: r = rmdir(name);
1212: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.1 markus 1213: send_status(id, status);
1.97 djm 1214: free(name);
1.1 markus 1215: }
1216:
1.28 itojun 1217: static void
1.98 djm 1218: process_realpath(u_int32_t id)
1.1 markus 1219: {
1.105 deraadt 1220: char resolvedname[PATH_MAX];
1.1 markus 1221: char *path;
1.104 djm 1222: int r;
1223:
1224: if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
1.120 djm 1225: fatal_fr(r, "parse");
1.1 markus 1226:
1.7 markus 1227: if (path[0] == '\0') {
1.97 djm 1228: free(path);
1.7 markus 1229: path = xstrdup(".");
1230: }
1.58 djm 1231: debug3("request %u: realpath", id);
1232: verbose("realpath \"%s\"", path);
1.117 djm 1233: if (sftp_realpath(path, resolvedname) == NULL) {
1.1 markus 1234: send_status(id, errno_to_portable(errno));
1235: } else {
1236: Stat s;
1237: attrib_clear(&s.attrib);
1238: s.name = s.long_name = resolvedname;
1239: send_names(id, 1, &s);
1240: }
1.97 djm 1241: free(path);
1.1 markus 1242: }
1243:
1.28 itojun 1244: static void
1.98 djm 1245: process_rename(u_int32_t id)
1.1 markus 1246: {
1247: char *oldpath, *newpath;
1.104 djm 1248: int r, status;
1.41 deraadt 1249: struct stat sb;
1.1 markus 1250:
1.104 djm 1251: if ((r = sshbuf_get_cstring(iqueue, &oldpath, NULL)) != 0 ||
1252: (r = sshbuf_get_cstring(iqueue, &newpath, NULL)) != 0)
1.120 djm 1253: fatal_fr(r, "parse");
1.104 djm 1254:
1.58 djm 1255: debug3("request %u: rename", id);
1256: logit("rename old \"%s\" new \"%s\"", oldpath, newpath);
1.41 deraadt 1257: status = SSH2_FX_FAILURE;
1.98 djm 1258: if (lstat(oldpath, &sb) == -1)
1.39 markus 1259: status = errno_to_portable(errno);
1.41 deraadt 1260: else if (S_ISREG(sb.st_mode)) {
1261: /* Race-free rename of regular files */
1.47 dtucker 1262: if (link(oldpath, newpath) == -1) {
1263: if (errno == EOPNOTSUPP) {
1264: struct stat st;
1265:
1266: /*
1267: * fs doesn't support links, so fall back to
1268: * stat+rename. This is racy.
1269: */
1270: if (stat(newpath, &st) == -1) {
1271: if (rename(oldpath, newpath) == -1)
1272: status =
1273: errno_to_portable(errno);
1274: else
1275: status = SSH2_FX_OK;
1276: }
1277: } else {
1278: status = errno_to_portable(errno);
1279: }
1280: } else if (unlink(oldpath) == -1) {
1.41 deraadt 1281: status = errno_to_portable(errno);
1282: /* clean spare link */
1283: unlink(newpath);
1284: } else
1285: status = SSH2_FX_OK;
1286: } else if (stat(newpath, &sb) == -1) {
1287: if (rename(oldpath, newpath) == -1)
1288: status = errno_to_portable(errno);
1289: else
1290: status = SSH2_FX_OK;
1291: }
1.1 markus 1292: send_status(id, status);
1.97 djm 1293: free(oldpath);
1294: free(newpath);
1.1 markus 1295: }
1296:
1.28 itojun 1297: static void
1.98 djm 1298: process_readlink(u_int32_t id)
1.23 djm 1299: {
1.104 djm 1300: int r, len;
1.105 deraadt 1301: char buf[PATH_MAX];
1.23 djm 1302: char *path;
1303:
1.104 djm 1304: if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
1.120 djm 1305: fatal_fr(r, "parse");
1.104 djm 1306:
1.58 djm 1307: debug3("request %u: readlink", id);
1308: verbose("readlink \"%s\"", path);
1.46 avsm 1309: if ((len = readlink(path, buf, sizeof(buf) - 1)) == -1)
1.23 djm 1310: send_status(id, errno_to_portable(errno));
1311: else {
1312: Stat s;
1.31 deraadt 1313:
1.46 avsm 1314: buf[len] = '\0';
1.23 djm 1315: attrib_clear(&s.attrib);
1.46 avsm 1316: s.name = s.long_name = buf;
1.23 djm 1317: send_names(id, 1, &s);
1318: }
1.97 djm 1319: free(path);
1.23 djm 1320: }
1321:
1.28 itojun 1322: static void
1.98 djm 1323: process_symlink(u_int32_t id)
1.23 djm 1324: {
1325: char *oldpath, *newpath;
1.104 djm 1326: int r, status;
1327:
1328: if ((r = sshbuf_get_cstring(iqueue, &oldpath, NULL)) != 0 ||
1329: (r = sshbuf_get_cstring(iqueue, &newpath, NULL)) != 0)
1.120 djm 1330: fatal_fr(r, "parse");
1.23 djm 1331:
1.58 djm 1332: debug3("request %u: symlink", id);
1333: logit("symlink old \"%s\" new \"%s\"", oldpath, newpath);
1.39 markus 1334: /* this will fail if 'newpath' exists */
1.104 djm 1335: r = symlink(oldpath, newpath);
1336: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.23 djm 1337: send_status(id, status);
1.97 djm 1338: free(oldpath);
1339: free(newpath);
1.23 djm 1340: }
1341:
1.28 itojun 1342: static void
1.78 djm 1343: process_extended_posix_rename(u_int32_t id)
1344: {
1345: char *oldpath, *newpath;
1.104 djm 1346: int r, status;
1347:
1348: if ((r = sshbuf_get_cstring(iqueue, &oldpath, NULL)) != 0 ||
1349: (r = sshbuf_get_cstring(iqueue, &newpath, NULL)) != 0)
1.120 djm 1350: fatal_fr(r, "parse");
1.78 djm 1351:
1352: debug3("request %u: posix-rename", id);
1353: logit("posix-rename old \"%s\" new \"%s\"", oldpath, newpath);
1.104 djm 1354: r = rename(oldpath, newpath);
1355: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.90 djm 1356: send_status(id, status);
1.97 djm 1357: free(oldpath);
1358: free(newpath);
1.78 djm 1359: }
1360:
1361: static void
1.79 djm 1362: process_extended_statvfs(u_int32_t id)
1363: {
1364: char *path;
1365: struct statvfs st;
1.104 djm 1366: int r;
1.79 djm 1367:
1.104 djm 1368: if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
1.120 djm 1369: fatal_fr(r, "parse");
1.103 dtucker 1370: debug3("request %u: statvfs", id);
1371: logit("statvfs \"%s\"", path);
1.79 djm 1372:
1373: if (statvfs(path, &st) != 0)
1374: send_status(id, errno_to_portable(errno));
1375: else
1376: send_statvfs(id, &st);
1.127 djm 1377: free(path);
1.79 djm 1378: }
1379:
1380: static void
1381: process_extended_fstatvfs(u_int32_t id)
1382: {
1.104 djm 1383: int r, handle, fd;
1.79 djm 1384: struct statvfs st;
1385:
1.104 djm 1386: if ((r = get_handle(iqueue, &handle)) != 0)
1.120 djm 1387: fatal_fr(r, "parse");
1.79 djm 1388: debug("request %u: fstatvfs \"%s\" (handle %u)",
1389: id, handle_to_name(handle), handle);
1390: if ((fd = handle_to_fd(handle)) < 0) {
1391: send_status(id, SSH2_FX_FAILURE);
1392: return;
1393: }
1394: if (fstatvfs(fd, &st) != 0)
1395: send_status(id, errno_to_portable(errno));
1396: else
1397: send_statvfs(id, &st);
1398: }
1399:
1400: static void
1.93 djm 1401: process_extended_hardlink(u_int32_t id)
1402: {
1403: char *oldpath, *newpath;
1.104 djm 1404: int r, status;
1405:
1406: if ((r = sshbuf_get_cstring(iqueue, &oldpath, NULL)) != 0 ||
1407: (r = sshbuf_get_cstring(iqueue, &newpath, NULL)) != 0)
1.120 djm 1408: fatal_fr(r, "parse");
1.93 djm 1409:
1410: debug3("request %u: hardlink", id);
1411: logit("hardlink old \"%s\" new \"%s\"", oldpath, newpath);
1.104 djm 1412: r = link(oldpath, newpath);
1413: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.93 djm 1414: send_status(id, status);
1.97 djm 1415: free(oldpath);
1416: free(newpath);
1.102 djm 1417: }
1418:
1419: static void
1420: process_extended_fsync(u_int32_t id)
1421: {
1.104 djm 1422: int handle, fd, r, status = SSH2_FX_OP_UNSUPPORTED;
1.102 djm 1423:
1.104 djm 1424: if ((r = get_handle(iqueue, &handle)) != 0)
1.120 djm 1425: fatal_fr(r, "parse");
1.102 djm 1426: debug3("request %u: fsync (handle %u)", id, handle);
1427: verbose("fsync \"%s\"", handle_to_name(handle));
1428: if ((fd = handle_to_fd(handle)) < 0)
1429: status = SSH2_FX_NO_SUCH_FILE;
1430: else if (handle_is_ok(handle, HANDLE_FILE)) {
1.104 djm 1431: r = fsync(fd);
1432: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.102 djm 1433: }
1434: send_status(id, status);
1.114 djm 1435: }
1436:
1437: static void
1438: process_extended_lsetstat(u_int32_t id)
1439: {
1440: Attrib a;
1441: char *name;
1442: int r, status = SSH2_FX_OK;
1443:
1444: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0 ||
1445: (r = decode_attrib(iqueue, &a)) != 0)
1.120 djm 1446: fatal_fr(r, "parse");
1.114 djm 1447:
1448: debug("request %u: lsetstat name \"%s\"", id, name);
1449: if (a.flags & SSH2_FILEXFER_ATTR_SIZE) {
1450: /* nonsensical for links */
1451: status = SSH2_FX_BAD_MESSAGE;
1452: goto out;
1453: }
1454: if (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
1455: logit("set \"%s\" mode %04o", name, a.perm);
1456: r = fchmodat(AT_FDCWD, name,
1457: a.perm & 07777, AT_SYMLINK_NOFOLLOW);
1458: if (r == -1)
1459: status = errno_to_portable(errno);
1460: }
1461: if (a.flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
1462: char buf[64];
1463: time_t t = a.mtime;
1464:
1465: strftime(buf, sizeof(buf), "%Y%m%d-%H:%M:%S",
1466: localtime(&t));
1467: logit("set \"%s\" modtime %s", name, buf);
1468: r = utimensat(AT_FDCWD, name,
1469: attrib_to_ts(&a), AT_SYMLINK_NOFOLLOW);
1470: if (r == -1)
1471: status = errno_to_portable(errno);
1472: }
1473: if (a.flags & SSH2_FILEXFER_ATTR_UIDGID) {
1474: logit("set \"%s\" owner %lu group %lu", name,
1475: (u_long)a.uid, (u_long)a.gid);
1476: r = fchownat(AT_FDCWD, name, a.uid, a.gid,
1477: AT_SYMLINK_NOFOLLOW);
1478: if (r == -1)
1479: status = errno_to_portable(errno);
1480: }
1481: out:
1482: send_status(id, status);
1483: free(name);
1.122 djm 1484: }
1485:
1486: static void
1487: process_extended_limits(u_int32_t id)
1488: {
1489: struct sshbuf *msg;
1490: int r;
1491: uint64_t nfiles = 0;
1492: struct rlimit rlim;
1493:
1494: debug("request %u: limits", id);
1495:
1496: if (getrlimit(RLIMIT_NOFILE, &rlim) != -1 && rlim.rlim_cur > 5)
1497: nfiles = rlim.rlim_cur - 5; /* stdio(3) + syslog + spare */
1498:
1499: if ((msg = sshbuf_new()) == NULL)
1500: fatal_f("sshbuf_new failed");
1501: if ((r = sshbuf_put_u8(msg, SSH2_FXP_EXTENDED_REPLY)) != 0 ||
1502: (r = sshbuf_put_u32(msg, id)) != 0 ||
1503: /* max-packet-length */
1504: (r = sshbuf_put_u64(msg, SFTP_MAX_MSG_LENGTH)) != 0 ||
1505: /* max-read-length */
1506: (r = sshbuf_put_u64(msg, SFTP_MAX_READ_LENGTH)) != 0 ||
1507: /* max-write-length */
1508: (r = sshbuf_put_u64(msg, SFTP_MAX_MSG_LENGTH - 1024)) != 0 ||
1509: /* max-open-handles */
1510: (r = sshbuf_put_u64(msg, nfiles)) != 0)
1511: fatal_fr(r, "compose");
1512: send_msg(msg);
1513: sshbuf_free(msg);
1.129 djm 1514: }
1515:
1516: static void
1517: process_extended_expand(u_int32_t id)
1518: {
1519: char cwd[PATH_MAX], resolvedname[PATH_MAX];
1520: char *path, *npath;
1521: int r;
1522: Stat s;
1523:
1524: if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
1525: fatal_fr(r, "parse");
1526: if (getcwd(cwd, sizeof(cwd)) == NULL) {
1527: send_status(id, errno_to_portable(errno));
1528: goto out;
1529: }
1530:
1531: debug3("request %u: expand, original \"%s\"", id, path);
1532: if (path[0] == '\0') {
1533: /* empty path */
1534: free(path);
1535: path = xstrdup(".");
1536: } else if (*path == '~') {
1537: /* ~ expand path */
1538: /* Special-case for "~" and "~/" to respect homedir flag */
1539: if (strcmp(path, "~") == 0) {
1540: free(path);
1541: path = xstrdup(cwd);
1542: } else if (strncmp(path, "~/", 2) == 0) {
1543: npath = xstrdup(path + 2);
1544: free(path);
1545: xasprintf(&path, "%s/%s", cwd, npath);
1.130 dtucker 1546: free(npath);
1.129 djm 1547: } else {
1548: /* ~user expansions */
1549: if (tilde_expand(path, pw->pw_uid, &npath) != 0) {
1.138 djm 1550: send_status_errmsg(id,
1551: errno_to_portable(ENOENT), "no such user");
1.129 djm 1552: goto out;
1553: }
1554: free(path);
1555: path = npath;
1556: }
1557: } else if (*path != '/') {
1558: /* relative path */
1559: xasprintf(&npath, "%s/%s", cwd, path);
1560: free(path);
1561: path = npath;
1562: }
1563: verbose("expand \"%s\"", path);
1564: if (sftp_realpath(path, resolvedname) == NULL) {
1565: send_status(id, errno_to_portable(errno));
1566: goto out;
1567: }
1568: attrib_clear(&s.attrib);
1569: s.name = s.long_name = resolvedname;
1570: send_names(id, 1, &s);
1571: out:
1572: free(path);
1.140 djm 1573: }
1574:
1575: static void
1576: process_extended_copy_data(u_int32_t id)
1577: {
1578: u_char buf[64*1024];
1579: int read_handle, read_fd, write_handle, write_fd;
1580: u_int64_t len, read_off, read_len, write_off;
1581: int r, copy_until_eof, status = SSH2_FX_OP_UNSUPPORTED;
1582: size_t ret;
1583:
1584: if ((r = get_handle(iqueue, &read_handle)) != 0 ||
1585: (r = sshbuf_get_u64(iqueue, &read_off)) != 0 ||
1586: (r = sshbuf_get_u64(iqueue, &read_len)) != 0 ||
1587: (r = get_handle(iqueue, &write_handle)) != 0 ||
1588: (r = sshbuf_get_u64(iqueue, &write_off)) != 0)
1589: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1590:
1591: debug("request %u: copy-data from \"%s\" (handle %d) off %llu len %llu "
1592: "to \"%s\" (handle %d) off %llu",
1593: id, handle_to_name(read_handle), read_handle,
1594: (unsigned long long)read_off, (unsigned long long)read_len,
1595: handle_to_name(write_handle), write_handle,
1596: (unsigned long long)write_off);
1597:
1598: /* For read length of 0, we read until EOF. */
1599: if (read_len == 0) {
1600: read_len = (u_int64_t)-1 - read_off;
1601: copy_until_eof = 1;
1602: } else
1603: copy_until_eof = 0;
1604:
1605: read_fd = handle_to_fd(read_handle);
1606: write_fd = handle_to_fd(write_handle);
1607:
1608: /* Disallow reading & writing to the same handle or same path or dirs */
1609: if (read_handle == write_handle || read_fd < 0 || write_fd < 0 ||
1610: !strcmp(handle_to_name(read_handle), handle_to_name(write_handle))) {
1611: status = SSH2_FX_FAILURE;
1612: goto out;
1613: }
1614:
1615: if (lseek(read_fd, read_off, SEEK_SET) < 0) {
1616: status = errno_to_portable(errno);
1617: error("%s: read_seek failed", __func__);
1618: goto out;
1619: }
1620:
1621: if ((handle_to_flags(write_handle) & O_APPEND) == 0 &&
1622: lseek(write_fd, write_off, SEEK_SET) < 0) {
1623: status = errno_to_portable(errno);
1624: error("%s: write_seek failed", __func__);
1625: goto out;
1626: }
1627:
1628: /* Process the request in chunks. */
1629: while (read_len > 0 || copy_until_eof) {
1630: len = MINIMUM(sizeof(buf), read_len);
1631: read_len -= len;
1632:
1633: ret = atomicio(read, read_fd, buf, len);
1634: if (ret == 0 && errno == EPIPE) {
1635: status = copy_until_eof ? SSH2_FX_OK : SSH2_FX_EOF;
1636: break;
1637: } else if (ret == 0) {
1638: status = errno_to_portable(errno);
1639: error("%s: read failed: %s", __func__, strerror(errno));
1640: break;
1641: }
1642: len = ret;
1643: handle_update_read(read_handle, len);
1644:
1645: ret = atomicio(vwrite, write_fd, buf, len);
1646: if (ret != len) {
1647: status = errno_to_portable(errno);
1648: error("%s: write failed: %llu != %llu: %s", __func__,
1649: (unsigned long long)ret, (unsigned long long)len,
1650: strerror(errno));
1651: break;
1652: }
1653: handle_update_write(write_handle, len);
1654: }
1655:
1656: if (read_len == 0)
1657: status = SSH2_FX_OK;
1658:
1659: out:
1660: send_status(id, status);
1.141 djm 1661: }
1662:
1663: static void
1664: process_extended_home_directory(u_int32_t id)
1665: {
1666: char *username;
1667: struct passwd *user_pw;
1668: int r;
1669: Stat s;
1670:
1671: if ((r = sshbuf_get_cstring(iqueue, &username, NULL)) != 0)
1672: fatal_fr(r, "parse");
1673:
1674: debug3("request %u: home-directory \"%s\"", id, username);
1675: if ((user_pw = getpwnam(username)) == NULL) {
1.142 djm 1676: send_status(id, SSH2_FX_FAILURE);
1.141 djm 1677: goto out;
1678: }
1679:
1680: verbose("home-directory \"%s\"", pw->pw_dir);
1681: attrib_clear(&s.attrib);
1682: s.name = s.long_name = pw->pw_dir;
1683: send_names(id, 1, &s);
1684: out:
1685: free(username);
1.143 ! djm 1686: }
! 1687:
! 1688: static void
! 1689: process_extended_get_users_groups_by_id(u_int32_t id)
! 1690: {
! 1691: struct passwd *user_pw;
! 1692: struct group *gr;
! 1693: struct sshbuf *uids, *gids, *usernames, *groupnames, *msg;
! 1694: int r;
! 1695: u_int n, nusers = 0, ngroups = 0;
! 1696: const char *name;
! 1697:
! 1698: if ((usernames = sshbuf_new()) == NULL ||
! 1699: (groupnames = sshbuf_new()) == NULL ||
! 1700: (msg = sshbuf_new()) == NULL)
! 1701: fatal_f("sshbuf_new failed");
! 1702: if ((r = sshbuf_froms(iqueue, &uids)) != 0 ||
! 1703: (r = sshbuf_froms(iqueue, &gids)) != 0)
! 1704: fatal_fr(r, "parse");
! 1705: debug_f("uids len = %zu, gids len = %zu",
! 1706: sshbuf_len(uids), sshbuf_len(gids));
! 1707: while (sshbuf_len(uids) != 0) {
! 1708: if ((r = sshbuf_get_u32(uids, &n)) != 0)
! 1709: fatal_fr(r, "parse inner uid");
! 1710: user_pw = getpwuid((uid_t)n);
! 1711: name = user_pw == NULL ? "" : user_pw->pw_name;
! 1712: debug3_f("uid %u => \"%s\"", n, name);
! 1713: if ((r = sshbuf_put_cstring(usernames, name)) != 0)
! 1714: fatal_fr(r, "assemble gid reply");
! 1715: nusers++;
! 1716: }
! 1717: while (sshbuf_len(gids) != 0) {
! 1718: if ((r = sshbuf_get_u32(gids, &n)) != 0)
! 1719: fatal_fr(r, "parse inner gid");
! 1720: gr = getgrgid((gid_t)n);
! 1721: name = gr == NULL ? "" : gr->gr_name;
! 1722: debug3_f("gid %u => \"%s\"", n, name);
! 1723: if ((r = sshbuf_put_cstring(groupnames, name)) != 0)
! 1724: fatal_fr(r, "assemble gid reply");
! 1725: nusers++;
! 1726: }
! 1727: verbose("users-groups-by-id: %u users, %u groups", nusers, ngroups);
! 1728:
! 1729: if ((r = sshbuf_put_u8(msg, SSH2_FXP_EXTENDED_REPLY)) != 0 ||
! 1730: (r = sshbuf_put_u32(msg, id)) != 0 ||
! 1731: (r = sshbuf_put_stringb(msg, usernames)) != 0 ||
! 1732: (r = sshbuf_put_stringb(msg, groupnames)) != 0)
! 1733: fatal_fr(r, "compose");
! 1734: send_msg(msg);
! 1735:
! 1736: sshbuf_free(uids);
! 1737: sshbuf_free(gids);
! 1738: sshbuf_free(usernames);
! 1739: sshbuf_free(groupnames);
! 1740: sshbuf_free(msg);
1.93 djm 1741: }
1742:
1743: static void
1.98 djm 1744: process_extended(u_int32_t id)
1.10 markus 1745: {
1746: char *request;
1.126 djm 1747: int r;
1.125 djm 1748: const struct sftp_handler *exthand;
1.10 markus 1749:
1.104 djm 1750: if ((r = sshbuf_get_cstring(iqueue, &request, NULL)) != 0)
1.120 djm 1751: fatal_fr(r, "parse");
1.125 djm 1752: if ((exthand = extended_handler_byname(request)) == NULL) {
1.98 djm 1753: error("Unknown extended request \"%.100s\"", request);
1.78 djm 1754: send_status(id, SSH2_FX_OP_UNSUPPORTED); /* MUST */
1.125 djm 1755: } else {
1756: if (!request_permitted(exthand))
1757: send_status(id, SSH2_FX_PERMISSION_DENIED);
1758: else
1759: exthand->handler(id);
1.98 djm 1760: }
1.97 djm 1761: free(request);
1.10 markus 1762: }
1.1 markus 1763:
1764: /* stolen from ssh-agent */
1765:
1.28 itojun 1766: static void
1.1 markus 1767: process(void)
1768: {
1.104 djm 1769: u_int msg_len;
1770: u_int buf_len;
1771: u_int consumed;
1772: u_char type;
1773: const u_char *cp;
1774: int i, r;
1.98 djm 1775: u_int32_t id;
1.1 markus 1776:
1.104 djm 1777: buf_len = sshbuf_len(iqueue);
1.34 markus 1778: if (buf_len < 5)
1.1 markus 1779: return; /* Incomplete message. */
1.104 djm 1780: cp = sshbuf_ptr(iqueue);
1.57 djm 1781: msg_len = get_u32(cp);
1.50 djm 1782: if (msg_len > SFTP_MAX_MSG_LENGTH) {
1.58 djm 1783: error("bad message from %s local user %s",
1784: client_addr, pw->pw_name);
1.76 markus 1785: sftp_server_cleanup_exit(11);
1.1 markus 1786: }
1.34 markus 1787: if (buf_len < msg_len + 4)
1.1 markus 1788: return;
1.104 djm 1789: if ((r = sshbuf_consume(iqueue, 4)) != 0)
1.120 djm 1790: fatal_fr(r, "consume");
1.34 markus 1791: buf_len -= 4;
1.104 djm 1792: if ((r = sshbuf_get_u8(iqueue, &type)) != 0)
1.120 djm 1793: fatal_fr(r, "parse type");
1.98 djm 1794:
1.1 markus 1795: switch (type) {
1.10 markus 1796: case SSH2_FXP_INIT:
1.1 markus 1797: process_init();
1.98 djm 1798: init_done = 1;
1.1 markus 1799: break;
1.10 markus 1800: case SSH2_FXP_EXTENDED:
1.98 djm 1801: if (!init_done)
1802: fatal("Received extended request before init");
1.104 djm 1803: if ((r = sshbuf_get_u32(iqueue, &id)) != 0)
1.120 djm 1804: fatal_fr(r, "parse extended ID");
1.98 djm 1805: process_extended(id);
1.10 markus 1806: break;
1.1 markus 1807: default:
1.98 djm 1808: if (!init_done)
1809: fatal("Received %u request before init", type);
1.104 djm 1810: if ((r = sshbuf_get_u32(iqueue, &id)) != 0)
1.120 djm 1811: fatal_fr(r, "parse ID");
1.98 djm 1812: for (i = 0; handlers[i].handler != NULL; i++) {
1813: if (type == handlers[i].type) {
1814: if (!request_permitted(&handlers[i])) {
1815: send_status(id,
1816: SSH2_FX_PERMISSION_DENIED);
1817: } else {
1818: handlers[i].handler(id);
1819: }
1820: break;
1821: }
1822: }
1823: if (handlers[i].handler == NULL)
1824: error("Unknown message %u", type);
1.1 markus 1825: }
1.34 markus 1826: /* discard the remaining bytes from the current packet */
1.104 djm 1827: if (buf_len < sshbuf_len(iqueue)) {
1.76 markus 1828: error("iqueue grew unexpectedly");
1829: sftp_server_cleanup_exit(255);
1830: }
1.104 djm 1831: consumed = buf_len - sshbuf_len(iqueue);
1.76 markus 1832: if (msg_len < consumed) {
1.98 djm 1833: error("msg_len %u < consumed %u", msg_len, consumed);
1.76 markus 1834: sftp_server_cleanup_exit(255);
1835: }
1.104 djm 1836: if (msg_len > consumed &&
1837: (r = sshbuf_consume(iqueue, msg_len - consumed)) != 0)
1.120 djm 1838: fatal_fr(r, "consume");
1.1 markus 1839: }
1840:
1.58 djm 1841: /* Cleanup handler that logs active handles upon normal exit */
1842: void
1.76 markus 1843: sftp_server_cleanup_exit(int i)
1.58 djm 1844: {
1845: if (pw != NULL && client_addr != NULL) {
1846: handle_log_exit();
1847: logit("session closed for local user %s from [%s]",
1848: pw->pw_name, client_addr);
1849: }
1850: _exit(i);
1851: }
1852:
1853: static void
1.76 markus 1854: sftp_server_usage(void)
1.58 djm 1855: {
1856: extern char *__progname;
1857:
1858: fprintf(stderr,
1.96 jmc 1859: "usage: %s [-ehR] [-d start_directory] [-f log_facility] "
1.118 djm 1860: "[-l log_level]\n\t[-P denied_requests] "
1861: "[-p allowed_requests] [-u umask]\n"
1.100 jmc 1862: " %s -Q protocol_feature\n",
1863: __progname, __progname);
1.58 djm 1864: exit(1);
1865: }
1866:
1.1 markus 1867: int
1.77 djm 1868: sftp_server_main(int argc, char **argv, struct passwd *user_pw)
1.1 markus 1869: {
1.132 deraadt 1870: int i, r, in, out, ch, skipargs = 0, log_stderr = 0;
1871: ssize_t len, olen;
1.58 djm 1872: SyslogFacility log_facility = SYSLOG_FACILITY_AUTH;
1.112 djm 1873: char *cp, *homedir = NULL, uidstr[32], buf[4*4096];
1.92 djm 1874: long mask;
1.58 djm 1875:
1876: extern char *optarg;
1877: extern char *__progname;
1.49 djm 1878:
1.58 djm 1879: log_init(__progname, log_level, log_facility, log_stderr);
1880:
1.95 djm 1881: pw = pwcopy(user_pw);
1882:
1.98 djm 1883: while (!skipargs && (ch = getopt(argc, argv,
1884: "d:f:l:P:p:Q:u:cehR")) != -1) {
1.58 djm 1885: switch (ch) {
1.98 djm 1886: case 'Q':
1887: if (strcasecmp(optarg, "requests") != 0) {
1888: fprintf(stderr, "Invalid query type\n");
1889: exit(1);
1890: }
1891: for (i = 0; handlers[i].handler != NULL; i++)
1892: printf("%s\n", handlers[i].name);
1893: for (i = 0; extended_handlers[i].handler != NULL; i++)
1894: printf("%s\n", extended_handlers[i].name);
1895: exit(0);
1896: break;
1.90 djm 1897: case 'R':
1898: readonly = 1;
1899: break;
1.58 djm 1900: case 'c':
1901: /*
1902: * Ignore all arguments if we are invoked as a
1.70 deraadt 1903: * shell using "sftp-server -c command"
1.58 djm 1904: */
1905: skipargs = 1;
1906: break;
1907: case 'e':
1908: log_stderr = 1;
1909: break;
1910: case 'l':
1911: log_level = log_level_number(optarg);
1912: if (log_level == SYSLOG_LEVEL_NOT_SET)
1913: error("Invalid log level \"%s\"", optarg);
1914: break;
1915: case 'f':
1916: log_facility = log_facility_number(optarg);
1.74 djm 1917: if (log_facility == SYSLOG_FACILITY_NOT_SET)
1.58 djm 1918: error("Invalid log facility \"%s\"", optarg);
1.86 djm 1919: break;
1.95 djm 1920: case 'd':
1921: cp = tilde_expand_filename(optarg, user_pw->pw_uid);
1.112 djm 1922: snprintf(uidstr, sizeof(uidstr), "%llu",
1923: (unsigned long long)pw->pw_uid);
1.95 djm 1924: homedir = percent_expand(cp, "d", user_pw->pw_dir,
1.112 djm 1925: "u", user_pw->pw_name, "U", uidstr, (char *)NULL);
1.95 djm 1926: free(cp);
1.98 djm 1927: break;
1928: case 'p':
1.118 djm 1929: if (request_allowlist != NULL)
1.98 djm 1930: fatal("Permitted requests already set");
1.118 djm 1931: request_allowlist = xstrdup(optarg);
1.98 djm 1932: break;
1933: case 'P':
1.118 djm 1934: if (request_denylist != NULL)
1.98 djm 1935: fatal("Refused requests already set");
1.118 djm 1936: request_denylist = xstrdup(optarg);
1.95 djm 1937: break;
1.86 djm 1938: case 'u':
1.92 djm 1939: errno = 0;
1940: mask = strtol(optarg, &cp, 8);
1941: if (mask < 0 || mask > 0777 || *cp != '\0' ||
1942: cp == optarg || (mask == 0 && errno != 0))
1943: fatal("Invalid umask \"%s\"", optarg);
1944: (void)umask((mode_t)mask);
1.58 djm 1945: break;
1946: case 'h':
1947: default:
1.76 markus 1948: sftp_server_usage();
1.58 djm 1949: }
1950: }
1951:
1952: log_init(__progname, log_level, log_facility, log_stderr);
1953:
1954: if ((cp = getenv("SSH_CONNECTION")) != NULL) {
1955: client_addr = xstrdup(cp);
1.76 markus 1956: if ((cp = strchr(client_addr, ' ')) == NULL) {
1957: error("Malformed SSH_CONNECTION variable: \"%s\"",
1.58 djm 1958: getenv("SSH_CONNECTION"));
1.76 markus 1959: sftp_server_cleanup_exit(255);
1960: }
1.58 djm 1961: *cp = '\0';
1962: } else
1963: client_addr = xstrdup("UNKNOWN");
1964:
1965: logit("session opened for local user %s from [%s]",
1966: pw->pw_name, client_addr);
1.10 markus 1967:
1.89 djm 1968: in = STDIN_FILENO;
1969: out = STDOUT_FILENO;
1.1 markus 1970:
1.104 djm 1971: if ((iqueue = sshbuf_new()) == NULL)
1.120 djm 1972: fatal_f("sshbuf_new failed");
1.104 djm 1973: if ((oqueue = sshbuf_new()) == NULL)
1.120 djm 1974: fatal_f("sshbuf_new failed");
1.1 markus 1975:
1.95 djm 1976: if (homedir != NULL) {
1977: if (chdir(homedir) != 0) {
1978: error("chdir to \"%s\" failed: %s", homedir,
1979: strerror(errno));
1980: }
1981: }
1.21 millert 1982:
1.1 markus 1983: for (;;) {
1.132 deraadt 1984: struct pollfd pfd[2];
1985:
1986: memset(pfd, 0, sizeof pfd);
1987: pfd[0].fd = pfd[1].fd = -1;
1.1 markus 1988:
1.73 djm 1989: /*
1990: * Ensure that we can read a full buffer and handle
1991: * the worst-case length packet it can generate,
1992: * otherwise apply backpressure by stopping reads.
1993: */
1.104 djm 1994: if ((r = sshbuf_check_reserve(iqueue, sizeof(buf))) == 0 &&
1995: (r = sshbuf_check_reserve(oqueue,
1.133 deraadt 1996: SFTP_MAX_MSG_LENGTH)) == 0) {
1.132 deraadt 1997: pfd[0].fd = in;
1.133 deraadt 1998: pfd[0].events = POLLIN;
1999: }
1.104 djm 2000: else if (r != SSH_ERR_NO_BUFFER_SPACE)
1.120 djm 2001: fatal_fr(r, "reserve");
1.73 djm 2002:
1.104 djm 2003: olen = sshbuf_len(oqueue);
1.133 deraadt 2004: if (olen > 0) {
1.132 deraadt 2005: pfd[1].fd = out;
1.133 deraadt 2006: pfd[1].events = POLLOUT;
2007: }
1.1 markus 2008:
1.132 deraadt 2009: if (poll(pfd, 2, -1) == -1) {
1.1 markus 2010: if (errno == EINTR)
2011: continue;
1.132 deraadt 2012: error("poll: %s", strerror(errno));
1.76 markus 2013: sftp_server_cleanup_exit(2);
1.1 markus 2014: }
2015:
2016: /* copy stdin to iqueue */
1.134 djm 2017: if (pfd[0].revents & (POLLIN|POLLHUP)) {
1.1 markus 2018: len = read(in, buf, sizeof buf);
2019: if (len == 0) {
2020: debug("read eof");
1.76 markus 2021: sftp_server_cleanup_exit(0);
1.116 deraadt 2022: } else if (len == -1) {
1.134 djm 2023: if (errno != EAGAIN && errno != EINTR) {
2024: error("read: %s", strerror(errno));
2025: sftp_server_cleanup_exit(1);
2026: }
1.120 djm 2027: } else if ((r = sshbuf_put(iqueue, buf, len)) != 0)
2028: fatal_fr(r, "sshbuf_put");
1.1 markus 2029: }
2030: /* send oqueue to stdout */
1.134 djm 2031: if (pfd[1].revents & (POLLOUT|POLLHUP)) {
1.104 djm 2032: len = write(out, sshbuf_ptr(oqueue), olen);
1.134 djm 2033: if (len == 0 || (len == -1 && errno == EPIPE)) {
2034: debug("write eof");
2035: sftp_server_cleanup_exit(0);
2036: } else if (len == -1) {
1.76 markus 2037: sftp_server_cleanup_exit(1);
1.134 djm 2038: if (errno != EAGAIN && errno != EINTR) {
2039: error("write: %s", strerror(errno));
2040: sftp_server_cleanup_exit(1);
2041: }
1.120 djm 2042: } else if ((r = sshbuf_consume(oqueue, len)) != 0)
2043: fatal_fr(r, "consume");
1.1 markus 2044: }
1.73 djm 2045:
2046: /*
2047: * Process requests from client if we can fit the results
2048: * into the output buffer, otherwise stop processing input
2049: * and let the output queue drain.
2050: */
1.104 djm 2051: r = sshbuf_check_reserve(oqueue, SFTP_MAX_MSG_LENGTH);
2052: if (r == 0)
1.73 djm 2053: process();
1.104 djm 2054: else if (r != SSH_ERR_NO_BUFFER_SPACE)
1.120 djm 2055: fatal_fr(r, "reserve");
1.1 markus 2056: }
2057: }
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