Annotation of src/usr.bin/ssh/sftp-server.c, Revision 1.145
1.145 ! dtucker 1: /* $OpenBSD: sftp-server.c,v 1.144 2022/09/19 10:41:58 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);
1.144 djm 1142: stats[count].long_name = ls_file(dp->d_name, &st,
1143: 0, 0, NULL, NULL);
1.1 markus 1144: count++;
1145: /* send up to 100 entries in one message */
1.11 markus 1146: /* XXX check packet size instead */
1.1 markus 1147: if (count == 100)
1148: break;
1149: }
1.10 markus 1150: if (count > 0) {
1151: send_names(id, count, stats);
1.31 deraadt 1152: for (i = 0; i < count; i++) {
1.97 djm 1153: free(stats[i].name);
1154: free(stats[i].long_name);
1.10 markus 1155: }
1156: } else {
1157: send_status(id, SSH2_FX_EOF);
1.1 markus 1158: }
1.97 djm 1159: free(stats);
1.1 markus 1160: }
1161: }
1162:
1.28 itojun 1163: static void
1.98 djm 1164: process_remove(u_int32_t id)
1.1 markus 1165: {
1166: char *name;
1.104 djm 1167: int r, status = SSH2_FX_FAILURE;
1168:
1169: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0)
1.120 djm 1170: fatal_fr(r, "parse");
1.1 markus 1171:
1.58 djm 1172: debug3("request %u: remove", id);
1173: logit("remove name \"%s\"", name);
1.104 djm 1174: r = unlink(name);
1175: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.1 markus 1176: send_status(id, status);
1.97 djm 1177: free(name);
1.1 markus 1178: }
1179:
1.28 itojun 1180: static void
1.98 djm 1181: process_mkdir(u_int32_t id)
1.1 markus 1182: {
1.104 djm 1183: Attrib a;
1.1 markus 1184: char *name;
1.104 djm 1185: int r, mode, status = SSH2_FX_FAILURE;
1186:
1187: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0 ||
1188: (r = decode_attrib(iqueue, &a)) != 0)
1.120 djm 1189: fatal_fr(r, "parse");
1.1 markus 1190:
1.104 djm 1191: mode = (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ?
1192: a.perm & 07777 : 0777;
1.58 djm 1193: debug3("request %u: mkdir", id);
1194: logit("mkdir name \"%s\" mode 0%o", name, mode);
1.104 djm 1195: r = mkdir(name, mode);
1196: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.1 markus 1197: send_status(id, status);
1.97 djm 1198: free(name);
1.1 markus 1199: }
1200:
1.28 itojun 1201: static void
1.98 djm 1202: process_rmdir(u_int32_t id)
1.1 markus 1203: {
1204: char *name;
1.104 djm 1205: int r, status;
1206:
1207: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0)
1.120 djm 1208: fatal_fr(r, "parse");
1.1 markus 1209:
1.58 djm 1210: debug3("request %u: rmdir", id);
1211: logit("rmdir name \"%s\"", name);
1.104 djm 1212: r = rmdir(name);
1213: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.1 markus 1214: send_status(id, status);
1.97 djm 1215: free(name);
1.1 markus 1216: }
1217:
1.28 itojun 1218: static void
1.98 djm 1219: process_realpath(u_int32_t id)
1.1 markus 1220: {
1.105 deraadt 1221: char resolvedname[PATH_MAX];
1.1 markus 1222: char *path;
1.104 djm 1223: int r;
1224:
1225: if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
1.120 djm 1226: fatal_fr(r, "parse");
1.1 markus 1227:
1.7 markus 1228: if (path[0] == '\0') {
1.97 djm 1229: free(path);
1.7 markus 1230: path = xstrdup(".");
1231: }
1.58 djm 1232: debug3("request %u: realpath", id);
1233: verbose("realpath \"%s\"", path);
1.117 djm 1234: if (sftp_realpath(path, resolvedname) == NULL) {
1.1 markus 1235: send_status(id, errno_to_portable(errno));
1236: } else {
1237: Stat s;
1238: attrib_clear(&s.attrib);
1239: s.name = s.long_name = resolvedname;
1240: send_names(id, 1, &s);
1241: }
1.97 djm 1242: free(path);
1.1 markus 1243: }
1244:
1.28 itojun 1245: static void
1.98 djm 1246: process_rename(u_int32_t id)
1.1 markus 1247: {
1248: char *oldpath, *newpath;
1.104 djm 1249: int r, status;
1.41 deraadt 1250: struct stat sb;
1.1 markus 1251:
1.104 djm 1252: if ((r = sshbuf_get_cstring(iqueue, &oldpath, NULL)) != 0 ||
1253: (r = sshbuf_get_cstring(iqueue, &newpath, NULL)) != 0)
1.120 djm 1254: fatal_fr(r, "parse");
1.104 djm 1255:
1.58 djm 1256: debug3("request %u: rename", id);
1257: logit("rename old \"%s\" new \"%s\"", oldpath, newpath);
1.41 deraadt 1258: status = SSH2_FX_FAILURE;
1.98 djm 1259: if (lstat(oldpath, &sb) == -1)
1.39 markus 1260: status = errno_to_portable(errno);
1.41 deraadt 1261: else if (S_ISREG(sb.st_mode)) {
1262: /* Race-free rename of regular files */
1.47 dtucker 1263: if (link(oldpath, newpath) == -1) {
1264: if (errno == EOPNOTSUPP) {
1265: struct stat st;
1266:
1267: /*
1268: * fs doesn't support links, so fall back to
1269: * stat+rename. This is racy.
1270: */
1271: if (stat(newpath, &st) == -1) {
1272: if (rename(oldpath, newpath) == -1)
1273: status =
1274: errno_to_portable(errno);
1275: else
1276: status = SSH2_FX_OK;
1277: }
1278: } else {
1279: status = errno_to_portable(errno);
1280: }
1281: } else if (unlink(oldpath) == -1) {
1.41 deraadt 1282: status = errno_to_portable(errno);
1283: /* clean spare link */
1284: unlink(newpath);
1285: } else
1286: status = SSH2_FX_OK;
1287: } else if (stat(newpath, &sb) == -1) {
1288: if (rename(oldpath, newpath) == -1)
1289: status = errno_to_portable(errno);
1290: else
1291: status = SSH2_FX_OK;
1292: }
1.1 markus 1293: send_status(id, status);
1.97 djm 1294: free(oldpath);
1295: free(newpath);
1.1 markus 1296: }
1297:
1.28 itojun 1298: static void
1.98 djm 1299: process_readlink(u_int32_t id)
1.23 djm 1300: {
1.104 djm 1301: int r, len;
1.105 deraadt 1302: char buf[PATH_MAX];
1.23 djm 1303: char *path;
1304:
1.104 djm 1305: if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
1.120 djm 1306: fatal_fr(r, "parse");
1.104 djm 1307:
1.58 djm 1308: debug3("request %u: readlink", id);
1309: verbose("readlink \"%s\"", path);
1.46 avsm 1310: if ((len = readlink(path, buf, sizeof(buf) - 1)) == -1)
1.23 djm 1311: send_status(id, errno_to_portable(errno));
1312: else {
1313: Stat s;
1.31 deraadt 1314:
1.46 avsm 1315: buf[len] = '\0';
1.23 djm 1316: attrib_clear(&s.attrib);
1.46 avsm 1317: s.name = s.long_name = buf;
1.23 djm 1318: send_names(id, 1, &s);
1319: }
1.97 djm 1320: free(path);
1.23 djm 1321: }
1322:
1.28 itojun 1323: static void
1.98 djm 1324: process_symlink(u_int32_t id)
1.23 djm 1325: {
1326: char *oldpath, *newpath;
1.104 djm 1327: int r, status;
1328:
1329: if ((r = sshbuf_get_cstring(iqueue, &oldpath, NULL)) != 0 ||
1330: (r = sshbuf_get_cstring(iqueue, &newpath, NULL)) != 0)
1.120 djm 1331: fatal_fr(r, "parse");
1.23 djm 1332:
1.58 djm 1333: debug3("request %u: symlink", id);
1334: logit("symlink old \"%s\" new \"%s\"", oldpath, newpath);
1.39 markus 1335: /* this will fail if 'newpath' exists */
1.104 djm 1336: r = symlink(oldpath, newpath);
1337: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.23 djm 1338: send_status(id, status);
1.97 djm 1339: free(oldpath);
1340: free(newpath);
1.23 djm 1341: }
1342:
1.28 itojun 1343: static void
1.78 djm 1344: process_extended_posix_rename(u_int32_t id)
1345: {
1346: char *oldpath, *newpath;
1.104 djm 1347: int r, status;
1348:
1349: if ((r = sshbuf_get_cstring(iqueue, &oldpath, NULL)) != 0 ||
1350: (r = sshbuf_get_cstring(iqueue, &newpath, NULL)) != 0)
1.120 djm 1351: fatal_fr(r, "parse");
1.78 djm 1352:
1353: debug3("request %u: posix-rename", id);
1354: logit("posix-rename old \"%s\" new \"%s\"", oldpath, newpath);
1.104 djm 1355: r = rename(oldpath, newpath);
1356: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.90 djm 1357: send_status(id, status);
1.97 djm 1358: free(oldpath);
1359: free(newpath);
1.78 djm 1360: }
1361:
1362: static void
1.79 djm 1363: process_extended_statvfs(u_int32_t id)
1364: {
1365: char *path;
1366: struct statvfs st;
1.104 djm 1367: int r;
1.79 djm 1368:
1.104 djm 1369: if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
1.120 djm 1370: fatal_fr(r, "parse");
1.103 dtucker 1371: debug3("request %u: statvfs", id);
1372: logit("statvfs \"%s\"", path);
1.79 djm 1373:
1374: if (statvfs(path, &st) != 0)
1375: send_status(id, errno_to_portable(errno));
1376: else
1377: send_statvfs(id, &st);
1.127 djm 1378: free(path);
1.79 djm 1379: }
1380:
1381: static void
1382: process_extended_fstatvfs(u_int32_t id)
1383: {
1.104 djm 1384: int r, handle, fd;
1.79 djm 1385: struct statvfs st;
1386:
1.104 djm 1387: if ((r = get_handle(iqueue, &handle)) != 0)
1.120 djm 1388: fatal_fr(r, "parse");
1.79 djm 1389: debug("request %u: fstatvfs \"%s\" (handle %u)",
1390: id, handle_to_name(handle), handle);
1391: if ((fd = handle_to_fd(handle)) < 0) {
1392: send_status(id, SSH2_FX_FAILURE);
1393: return;
1394: }
1395: if (fstatvfs(fd, &st) != 0)
1396: send_status(id, errno_to_portable(errno));
1397: else
1398: send_statvfs(id, &st);
1399: }
1400:
1401: static void
1.93 djm 1402: process_extended_hardlink(u_int32_t id)
1403: {
1404: char *oldpath, *newpath;
1.104 djm 1405: int r, status;
1406:
1407: if ((r = sshbuf_get_cstring(iqueue, &oldpath, NULL)) != 0 ||
1408: (r = sshbuf_get_cstring(iqueue, &newpath, NULL)) != 0)
1.120 djm 1409: fatal_fr(r, "parse");
1.93 djm 1410:
1411: debug3("request %u: hardlink", id);
1412: logit("hardlink old \"%s\" new \"%s\"", oldpath, newpath);
1.104 djm 1413: r = link(oldpath, newpath);
1414: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.93 djm 1415: send_status(id, status);
1.97 djm 1416: free(oldpath);
1417: free(newpath);
1.102 djm 1418: }
1419:
1420: static void
1421: process_extended_fsync(u_int32_t id)
1422: {
1.104 djm 1423: int handle, fd, r, status = SSH2_FX_OP_UNSUPPORTED;
1.102 djm 1424:
1.104 djm 1425: if ((r = get_handle(iqueue, &handle)) != 0)
1.120 djm 1426: fatal_fr(r, "parse");
1.102 djm 1427: debug3("request %u: fsync (handle %u)", id, handle);
1428: verbose("fsync \"%s\"", handle_to_name(handle));
1429: if ((fd = handle_to_fd(handle)) < 0)
1430: status = SSH2_FX_NO_SUCH_FILE;
1431: else if (handle_is_ok(handle, HANDLE_FILE)) {
1.104 djm 1432: r = fsync(fd);
1433: status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
1.102 djm 1434: }
1435: send_status(id, status);
1.114 djm 1436: }
1437:
1438: static void
1439: process_extended_lsetstat(u_int32_t id)
1440: {
1441: Attrib a;
1442: char *name;
1443: int r, status = SSH2_FX_OK;
1444:
1445: if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0 ||
1446: (r = decode_attrib(iqueue, &a)) != 0)
1.120 djm 1447: fatal_fr(r, "parse");
1.114 djm 1448:
1449: debug("request %u: lsetstat name \"%s\"", id, name);
1450: if (a.flags & SSH2_FILEXFER_ATTR_SIZE) {
1451: /* nonsensical for links */
1452: status = SSH2_FX_BAD_MESSAGE;
1453: goto out;
1454: }
1455: if (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
1456: logit("set \"%s\" mode %04o", name, a.perm);
1457: r = fchmodat(AT_FDCWD, name,
1458: a.perm & 07777, AT_SYMLINK_NOFOLLOW);
1459: if (r == -1)
1460: status = errno_to_portable(errno);
1461: }
1462: if (a.flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
1463: char buf[64];
1464: time_t t = a.mtime;
1465:
1466: strftime(buf, sizeof(buf), "%Y%m%d-%H:%M:%S",
1467: localtime(&t));
1468: logit("set \"%s\" modtime %s", name, buf);
1469: r = utimensat(AT_FDCWD, name,
1470: attrib_to_ts(&a), AT_SYMLINK_NOFOLLOW);
1471: if (r == -1)
1472: status = errno_to_portable(errno);
1473: }
1474: if (a.flags & SSH2_FILEXFER_ATTR_UIDGID) {
1475: logit("set \"%s\" owner %lu group %lu", name,
1476: (u_long)a.uid, (u_long)a.gid);
1477: r = fchownat(AT_FDCWD, name, a.uid, a.gid,
1478: AT_SYMLINK_NOFOLLOW);
1479: if (r == -1)
1480: status = errno_to_portable(errno);
1481: }
1482: out:
1483: send_status(id, status);
1484: free(name);
1.122 djm 1485: }
1486:
1487: static void
1488: process_extended_limits(u_int32_t id)
1489: {
1490: struct sshbuf *msg;
1491: int r;
1492: uint64_t nfiles = 0;
1493: struct rlimit rlim;
1494:
1495: debug("request %u: limits", id);
1496:
1497: if (getrlimit(RLIMIT_NOFILE, &rlim) != -1 && rlim.rlim_cur > 5)
1498: nfiles = rlim.rlim_cur - 5; /* stdio(3) + syslog + spare */
1499:
1500: if ((msg = sshbuf_new()) == NULL)
1501: fatal_f("sshbuf_new failed");
1502: if ((r = sshbuf_put_u8(msg, SSH2_FXP_EXTENDED_REPLY)) != 0 ||
1503: (r = sshbuf_put_u32(msg, id)) != 0 ||
1504: /* max-packet-length */
1505: (r = sshbuf_put_u64(msg, SFTP_MAX_MSG_LENGTH)) != 0 ||
1506: /* max-read-length */
1507: (r = sshbuf_put_u64(msg, SFTP_MAX_READ_LENGTH)) != 0 ||
1508: /* max-write-length */
1509: (r = sshbuf_put_u64(msg, SFTP_MAX_MSG_LENGTH - 1024)) != 0 ||
1510: /* max-open-handles */
1511: (r = sshbuf_put_u64(msg, nfiles)) != 0)
1512: fatal_fr(r, "compose");
1513: send_msg(msg);
1514: sshbuf_free(msg);
1.129 djm 1515: }
1516:
1517: static void
1518: process_extended_expand(u_int32_t id)
1519: {
1520: char cwd[PATH_MAX], resolvedname[PATH_MAX];
1521: char *path, *npath;
1522: int r;
1523: Stat s;
1524:
1525: if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
1526: fatal_fr(r, "parse");
1527: if (getcwd(cwd, sizeof(cwd)) == NULL) {
1528: send_status(id, errno_to_portable(errno));
1529: goto out;
1530: }
1531:
1532: debug3("request %u: expand, original \"%s\"", id, path);
1533: if (path[0] == '\0') {
1534: /* empty path */
1535: free(path);
1536: path = xstrdup(".");
1537: } else if (*path == '~') {
1538: /* ~ expand path */
1539: /* Special-case for "~" and "~/" to respect homedir flag */
1540: if (strcmp(path, "~") == 0) {
1541: free(path);
1542: path = xstrdup(cwd);
1543: } else if (strncmp(path, "~/", 2) == 0) {
1544: npath = xstrdup(path + 2);
1545: free(path);
1546: xasprintf(&path, "%s/%s", cwd, npath);
1.130 dtucker 1547: free(npath);
1.129 djm 1548: } else {
1549: /* ~user expansions */
1550: if (tilde_expand(path, pw->pw_uid, &npath) != 0) {
1.138 djm 1551: send_status_errmsg(id,
1552: errno_to_portable(ENOENT), "no such user");
1.129 djm 1553: goto out;
1554: }
1555: free(path);
1556: path = npath;
1557: }
1558: } else if (*path != '/') {
1559: /* relative path */
1560: xasprintf(&npath, "%s/%s", cwd, path);
1561: free(path);
1562: path = npath;
1563: }
1564: verbose("expand \"%s\"", path);
1565: if (sftp_realpath(path, resolvedname) == NULL) {
1566: send_status(id, errno_to_portable(errno));
1567: goto out;
1568: }
1569: attrib_clear(&s.attrib);
1570: s.name = s.long_name = resolvedname;
1571: send_names(id, 1, &s);
1572: out:
1573: free(path);
1.140 djm 1574: }
1575:
1576: static void
1577: process_extended_copy_data(u_int32_t id)
1578: {
1579: u_char buf[64*1024];
1580: int read_handle, read_fd, write_handle, write_fd;
1581: u_int64_t len, read_off, read_len, write_off;
1582: int r, copy_until_eof, status = SSH2_FX_OP_UNSUPPORTED;
1583: size_t ret;
1584:
1585: if ((r = get_handle(iqueue, &read_handle)) != 0 ||
1586: (r = sshbuf_get_u64(iqueue, &read_off)) != 0 ||
1587: (r = sshbuf_get_u64(iqueue, &read_len)) != 0 ||
1588: (r = get_handle(iqueue, &write_handle)) != 0 ||
1589: (r = sshbuf_get_u64(iqueue, &write_off)) != 0)
1590: fatal("%s: buffer error: %s", __func__, ssh_err(r));
1591:
1592: debug("request %u: copy-data from \"%s\" (handle %d) off %llu len %llu "
1593: "to \"%s\" (handle %d) off %llu",
1594: id, handle_to_name(read_handle), read_handle,
1595: (unsigned long long)read_off, (unsigned long long)read_len,
1596: handle_to_name(write_handle), write_handle,
1597: (unsigned long long)write_off);
1598:
1599: /* For read length of 0, we read until EOF. */
1600: if (read_len == 0) {
1601: read_len = (u_int64_t)-1 - read_off;
1602: copy_until_eof = 1;
1603: } else
1604: copy_until_eof = 0;
1605:
1606: read_fd = handle_to_fd(read_handle);
1607: write_fd = handle_to_fd(write_handle);
1608:
1609: /* Disallow reading & writing to the same handle or same path or dirs */
1610: if (read_handle == write_handle || read_fd < 0 || write_fd < 0 ||
1611: !strcmp(handle_to_name(read_handle), handle_to_name(write_handle))) {
1612: status = SSH2_FX_FAILURE;
1613: goto out;
1614: }
1615:
1616: if (lseek(read_fd, read_off, SEEK_SET) < 0) {
1617: status = errno_to_portable(errno);
1618: error("%s: read_seek failed", __func__);
1619: goto out;
1620: }
1621:
1622: if ((handle_to_flags(write_handle) & O_APPEND) == 0 &&
1623: lseek(write_fd, write_off, SEEK_SET) < 0) {
1624: status = errno_to_portable(errno);
1625: error("%s: write_seek failed", __func__);
1626: goto out;
1627: }
1628:
1629: /* Process the request in chunks. */
1630: while (read_len > 0 || copy_until_eof) {
1631: len = MINIMUM(sizeof(buf), read_len);
1632: read_len -= len;
1633:
1634: ret = atomicio(read, read_fd, buf, len);
1635: if (ret == 0 && errno == EPIPE) {
1636: status = copy_until_eof ? SSH2_FX_OK : SSH2_FX_EOF;
1637: break;
1638: } else if (ret == 0) {
1639: status = errno_to_portable(errno);
1640: error("%s: read failed: %s", __func__, strerror(errno));
1641: break;
1642: }
1643: len = ret;
1644: handle_update_read(read_handle, len);
1645:
1646: ret = atomicio(vwrite, write_fd, buf, len);
1647: if (ret != len) {
1648: status = errno_to_portable(errno);
1649: error("%s: write failed: %llu != %llu: %s", __func__,
1650: (unsigned long long)ret, (unsigned long long)len,
1651: strerror(errno));
1652: break;
1653: }
1654: handle_update_write(write_handle, len);
1655: }
1656:
1657: if (read_len == 0)
1658: status = SSH2_FX_OK;
1659:
1660: out:
1661: send_status(id, status);
1.141 djm 1662: }
1663:
1664: static void
1665: process_extended_home_directory(u_int32_t id)
1666: {
1667: char *username;
1668: struct passwd *user_pw;
1669: int r;
1670: Stat s;
1671:
1672: if ((r = sshbuf_get_cstring(iqueue, &username, NULL)) != 0)
1673: fatal_fr(r, "parse");
1674:
1675: debug3("request %u: home-directory \"%s\"", id, username);
1676: if ((user_pw = getpwnam(username)) == NULL) {
1.142 djm 1677: send_status(id, SSH2_FX_FAILURE);
1.141 djm 1678: goto out;
1679: }
1680:
1681: verbose("home-directory \"%s\"", pw->pw_dir);
1682: attrib_clear(&s.attrib);
1683: s.name = s.long_name = pw->pw_dir;
1684: send_names(id, 1, &s);
1685: out:
1686: free(username);
1.143 djm 1687: }
1688:
1689: static void
1690: process_extended_get_users_groups_by_id(u_int32_t id)
1691: {
1692: struct passwd *user_pw;
1693: struct group *gr;
1694: struct sshbuf *uids, *gids, *usernames, *groupnames, *msg;
1695: int r;
1696: u_int n, nusers = 0, ngroups = 0;
1697: const char *name;
1698:
1699: if ((usernames = sshbuf_new()) == NULL ||
1700: (groupnames = sshbuf_new()) == NULL ||
1701: (msg = sshbuf_new()) == NULL)
1702: fatal_f("sshbuf_new failed");
1703: if ((r = sshbuf_froms(iqueue, &uids)) != 0 ||
1704: (r = sshbuf_froms(iqueue, &gids)) != 0)
1705: fatal_fr(r, "parse");
1706: debug_f("uids len = %zu, gids len = %zu",
1707: sshbuf_len(uids), sshbuf_len(gids));
1708: while (sshbuf_len(uids) != 0) {
1709: if ((r = sshbuf_get_u32(uids, &n)) != 0)
1710: fatal_fr(r, "parse inner uid");
1711: user_pw = getpwuid((uid_t)n);
1712: name = user_pw == NULL ? "" : user_pw->pw_name;
1713: debug3_f("uid %u => \"%s\"", n, name);
1714: if ((r = sshbuf_put_cstring(usernames, name)) != 0)
1.145 ! dtucker 1715: fatal_fr(r, "assemble uid reply");
1.143 djm 1716: nusers++;
1717: }
1718: while (sshbuf_len(gids) != 0) {
1719: if ((r = sshbuf_get_u32(gids, &n)) != 0)
1720: fatal_fr(r, "parse inner gid");
1721: gr = getgrgid((gid_t)n);
1722: name = gr == NULL ? "" : gr->gr_name;
1723: debug3_f("gid %u => \"%s\"", n, name);
1724: if ((r = sshbuf_put_cstring(groupnames, name)) != 0)
1725: fatal_fr(r, "assemble gid reply");
1726: nusers++;
1727: }
1728: verbose("users-groups-by-id: %u users, %u groups", nusers, ngroups);
1729:
1730: if ((r = sshbuf_put_u8(msg, SSH2_FXP_EXTENDED_REPLY)) != 0 ||
1731: (r = sshbuf_put_u32(msg, id)) != 0 ||
1732: (r = sshbuf_put_stringb(msg, usernames)) != 0 ||
1733: (r = sshbuf_put_stringb(msg, groupnames)) != 0)
1734: fatal_fr(r, "compose");
1735: send_msg(msg);
1736:
1737: sshbuf_free(uids);
1738: sshbuf_free(gids);
1739: sshbuf_free(usernames);
1740: sshbuf_free(groupnames);
1741: sshbuf_free(msg);
1.93 djm 1742: }
1743:
1744: static void
1.98 djm 1745: process_extended(u_int32_t id)
1.10 markus 1746: {
1747: char *request;
1.126 djm 1748: int r;
1.125 djm 1749: const struct sftp_handler *exthand;
1.10 markus 1750:
1.104 djm 1751: if ((r = sshbuf_get_cstring(iqueue, &request, NULL)) != 0)
1.120 djm 1752: fatal_fr(r, "parse");
1.125 djm 1753: if ((exthand = extended_handler_byname(request)) == NULL) {
1.98 djm 1754: error("Unknown extended request \"%.100s\"", request);
1.78 djm 1755: send_status(id, SSH2_FX_OP_UNSUPPORTED); /* MUST */
1.125 djm 1756: } else {
1757: if (!request_permitted(exthand))
1758: send_status(id, SSH2_FX_PERMISSION_DENIED);
1759: else
1760: exthand->handler(id);
1.98 djm 1761: }
1.97 djm 1762: free(request);
1.10 markus 1763: }
1.1 markus 1764:
1765: /* stolen from ssh-agent */
1766:
1.28 itojun 1767: static void
1.1 markus 1768: process(void)
1769: {
1.104 djm 1770: u_int msg_len;
1771: u_int buf_len;
1772: u_int consumed;
1773: u_char type;
1774: const u_char *cp;
1775: int i, r;
1.98 djm 1776: u_int32_t id;
1.1 markus 1777:
1.104 djm 1778: buf_len = sshbuf_len(iqueue);
1.34 markus 1779: if (buf_len < 5)
1.1 markus 1780: return; /* Incomplete message. */
1.104 djm 1781: cp = sshbuf_ptr(iqueue);
1.57 djm 1782: msg_len = get_u32(cp);
1.50 djm 1783: if (msg_len > SFTP_MAX_MSG_LENGTH) {
1.58 djm 1784: error("bad message from %s local user %s",
1785: client_addr, pw->pw_name);
1.76 markus 1786: sftp_server_cleanup_exit(11);
1.1 markus 1787: }
1.34 markus 1788: if (buf_len < msg_len + 4)
1.1 markus 1789: return;
1.104 djm 1790: if ((r = sshbuf_consume(iqueue, 4)) != 0)
1.120 djm 1791: fatal_fr(r, "consume");
1.34 markus 1792: buf_len -= 4;
1.104 djm 1793: if ((r = sshbuf_get_u8(iqueue, &type)) != 0)
1.120 djm 1794: fatal_fr(r, "parse type");
1.98 djm 1795:
1.1 markus 1796: switch (type) {
1.10 markus 1797: case SSH2_FXP_INIT:
1.1 markus 1798: process_init();
1.98 djm 1799: init_done = 1;
1.1 markus 1800: break;
1.10 markus 1801: case SSH2_FXP_EXTENDED:
1.98 djm 1802: if (!init_done)
1803: fatal("Received extended request before init");
1.104 djm 1804: if ((r = sshbuf_get_u32(iqueue, &id)) != 0)
1.120 djm 1805: fatal_fr(r, "parse extended ID");
1.98 djm 1806: process_extended(id);
1.10 markus 1807: break;
1.1 markus 1808: default:
1.98 djm 1809: if (!init_done)
1810: fatal("Received %u request before init", type);
1.104 djm 1811: if ((r = sshbuf_get_u32(iqueue, &id)) != 0)
1.120 djm 1812: fatal_fr(r, "parse ID");
1.98 djm 1813: for (i = 0; handlers[i].handler != NULL; i++) {
1814: if (type == handlers[i].type) {
1815: if (!request_permitted(&handlers[i])) {
1816: send_status(id,
1817: SSH2_FX_PERMISSION_DENIED);
1818: } else {
1819: handlers[i].handler(id);
1820: }
1821: break;
1822: }
1823: }
1824: if (handlers[i].handler == NULL)
1825: error("Unknown message %u", type);
1.1 markus 1826: }
1.34 markus 1827: /* discard the remaining bytes from the current packet */
1.104 djm 1828: if (buf_len < sshbuf_len(iqueue)) {
1.76 markus 1829: error("iqueue grew unexpectedly");
1830: sftp_server_cleanup_exit(255);
1831: }
1.104 djm 1832: consumed = buf_len - sshbuf_len(iqueue);
1.76 markus 1833: if (msg_len < consumed) {
1.98 djm 1834: error("msg_len %u < consumed %u", msg_len, consumed);
1.76 markus 1835: sftp_server_cleanup_exit(255);
1836: }
1.104 djm 1837: if (msg_len > consumed &&
1838: (r = sshbuf_consume(iqueue, msg_len - consumed)) != 0)
1.120 djm 1839: fatal_fr(r, "consume");
1.1 markus 1840: }
1841:
1.58 djm 1842: /* Cleanup handler that logs active handles upon normal exit */
1843: void
1.76 markus 1844: sftp_server_cleanup_exit(int i)
1.58 djm 1845: {
1846: if (pw != NULL && client_addr != NULL) {
1847: handle_log_exit();
1848: logit("session closed for local user %s from [%s]",
1849: pw->pw_name, client_addr);
1850: }
1851: _exit(i);
1852: }
1853:
1854: static void
1.76 markus 1855: sftp_server_usage(void)
1.58 djm 1856: {
1857: extern char *__progname;
1858:
1859: fprintf(stderr,
1.96 jmc 1860: "usage: %s [-ehR] [-d start_directory] [-f log_facility] "
1.118 djm 1861: "[-l log_level]\n\t[-P denied_requests] "
1862: "[-p allowed_requests] [-u umask]\n"
1.100 jmc 1863: " %s -Q protocol_feature\n",
1864: __progname, __progname);
1.58 djm 1865: exit(1);
1866: }
1867:
1.1 markus 1868: int
1.77 djm 1869: sftp_server_main(int argc, char **argv, struct passwd *user_pw)
1.1 markus 1870: {
1.132 deraadt 1871: int i, r, in, out, ch, skipargs = 0, log_stderr = 0;
1872: ssize_t len, olen;
1.58 djm 1873: SyslogFacility log_facility = SYSLOG_FACILITY_AUTH;
1.112 djm 1874: char *cp, *homedir = NULL, uidstr[32], buf[4*4096];
1.92 djm 1875: long mask;
1.58 djm 1876:
1877: extern char *optarg;
1878: extern char *__progname;
1.49 djm 1879:
1.58 djm 1880: log_init(__progname, log_level, log_facility, log_stderr);
1881:
1.95 djm 1882: pw = pwcopy(user_pw);
1883:
1.98 djm 1884: while (!skipargs && (ch = getopt(argc, argv,
1885: "d:f:l:P:p:Q:u:cehR")) != -1) {
1.58 djm 1886: switch (ch) {
1.98 djm 1887: case 'Q':
1888: if (strcasecmp(optarg, "requests") != 0) {
1889: fprintf(stderr, "Invalid query type\n");
1890: exit(1);
1891: }
1892: for (i = 0; handlers[i].handler != NULL; i++)
1893: printf("%s\n", handlers[i].name);
1894: for (i = 0; extended_handlers[i].handler != NULL; i++)
1895: printf("%s\n", extended_handlers[i].name);
1896: exit(0);
1897: break;
1.90 djm 1898: case 'R':
1899: readonly = 1;
1900: break;
1.58 djm 1901: case 'c':
1902: /*
1903: * Ignore all arguments if we are invoked as a
1.70 deraadt 1904: * shell using "sftp-server -c command"
1.58 djm 1905: */
1906: skipargs = 1;
1907: break;
1908: case 'e':
1909: log_stderr = 1;
1910: break;
1911: case 'l':
1912: log_level = log_level_number(optarg);
1913: if (log_level == SYSLOG_LEVEL_NOT_SET)
1914: error("Invalid log level \"%s\"", optarg);
1915: break;
1916: case 'f':
1917: log_facility = log_facility_number(optarg);
1.74 djm 1918: if (log_facility == SYSLOG_FACILITY_NOT_SET)
1.58 djm 1919: error("Invalid log facility \"%s\"", optarg);
1.86 djm 1920: break;
1.95 djm 1921: case 'd':
1922: cp = tilde_expand_filename(optarg, user_pw->pw_uid);
1.112 djm 1923: snprintf(uidstr, sizeof(uidstr), "%llu",
1924: (unsigned long long)pw->pw_uid);
1.95 djm 1925: homedir = percent_expand(cp, "d", user_pw->pw_dir,
1.112 djm 1926: "u", user_pw->pw_name, "U", uidstr, (char *)NULL);
1.95 djm 1927: free(cp);
1.98 djm 1928: break;
1929: case 'p':
1.118 djm 1930: if (request_allowlist != NULL)
1.98 djm 1931: fatal("Permitted requests already set");
1.118 djm 1932: request_allowlist = xstrdup(optarg);
1.98 djm 1933: break;
1934: case 'P':
1.118 djm 1935: if (request_denylist != NULL)
1.98 djm 1936: fatal("Refused requests already set");
1.118 djm 1937: request_denylist = xstrdup(optarg);
1.95 djm 1938: break;
1.86 djm 1939: case 'u':
1.92 djm 1940: errno = 0;
1941: mask = strtol(optarg, &cp, 8);
1942: if (mask < 0 || mask > 0777 || *cp != '\0' ||
1943: cp == optarg || (mask == 0 && errno != 0))
1944: fatal("Invalid umask \"%s\"", optarg);
1945: (void)umask((mode_t)mask);
1.58 djm 1946: break;
1947: case 'h':
1948: default:
1.76 markus 1949: sftp_server_usage();
1.58 djm 1950: }
1951: }
1952:
1953: log_init(__progname, log_level, log_facility, log_stderr);
1954:
1955: if ((cp = getenv("SSH_CONNECTION")) != NULL) {
1956: client_addr = xstrdup(cp);
1.76 markus 1957: if ((cp = strchr(client_addr, ' ')) == NULL) {
1958: error("Malformed SSH_CONNECTION variable: \"%s\"",
1.58 djm 1959: getenv("SSH_CONNECTION"));
1.76 markus 1960: sftp_server_cleanup_exit(255);
1961: }
1.58 djm 1962: *cp = '\0';
1963: } else
1964: client_addr = xstrdup("UNKNOWN");
1965:
1966: logit("session opened for local user %s from [%s]",
1967: pw->pw_name, client_addr);
1.10 markus 1968:
1.89 djm 1969: in = STDIN_FILENO;
1970: out = STDOUT_FILENO;
1.1 markus 1971:
1.104 djm 1972: if ((iqueue = sshbuf_new()) == NULL)
1.120 djm 1973: fatal_f("sshbuf_new failed");
1.104 djm 1974: if ((oqueue = sshbuf_new()) == NULL)
1.120 djm 1975: fatal_f("sshbuf_new failed");
1.1 markus 1976:
1.95 djm 1977: if (homedir != NULL) {
1978: if (chdir(homedir) != 0) {
1979: error("chdir to \"%s\" failed: %s", homedir,
1980: strerror(errno));
1981: }
1982: }
1.21 millert 1983:
1.1 markus 1984: for (;;) {
1.132 deraadt 1985: struct pollfd pfd[2];
1986:
1987: memset(pfd, 0, sizeof pfd);
1988: pfd[0].fd = pfd[1].fd = -1;
1.1 markus 1989:
1.73 djm 1990: /*
1991: * Ensure that we can read a full buffer and handle
1992: * the worst-case length packet it can generate,
1993: * otherwise apply backpressure by stopping reads.
1994: */
1.104 djm 1995: if ((r = sshbuf_check_reserve(iqueue, sizeof(buf))) == 0 &&
1996: (r = sshbuf_check_reserve(oqueue,
1.133 deraadt 1997: SFTP_MAX_MSG_LENGTH)) == 0) {
1.132 deraadt 1998: pfd[0].fd = in;
1.133 deraadt 1999: pfd[0].events = POLLIN;
2000: }
1.104 djm 2001: else if (r != SSH_ERR_NO_BUFFER_SPACE)
1.120 djm 2002: fatal_fr(r, "reserve");
1.73 djm 2003:
1.104 djm 2004: olen = sshbuf_len(oqueue);
1.133 deraadt 2005: if (olen > 0) {
1.132 deraadt 2006: pfd[1].fd = out;
1.133 deraadt 2007: pfd[1].events = POLLOUT;
2008: }
1.1 markus 2009:
1.132 deraadt 2010: if (poll(pfd, 2, -1) == -1) {
1.1 markus 2011: if (errno == EINTR)
2012: continue;
1.132 deraadt 2013: error("poll: %s", strerror(errno));
1.76 markus 2014: sftp_server_cleanup_exit(2);
1.1 markus 2015: }
2016:
2017: /* copy stdin to iqueue */
1.134 djm 2018: if (pfd[0].revents & (POLLIN|POLLHUP)) {
1.1 markus 2019: len = read(in, buf, sizeof buf);
2020: if (len == 0) {
2021: debug("read eof");
1.76 markus 2022: sftp_server_cleanup_exit(0);
1.116 deraadt 2023: } else if (len == -1) {
1.134 djm 2024: if (errno != EAGAIN && errno != EINTR) {
2025: error("read: %s", strerror(errno));
2026: sftp_server_cleanup_exit(1);
2027: }
1.120 djm 2028: } else if ((r = sshbuf_put(iqueue, buf, len)) != 0)
2029: fatal_fr(r, "sshbuf_put");
1.1 markus 2030: }
2031: /* send oqueue to stdout */
1.134 djm 2032: if (pfd[1].revents & (POLLOUT|POLLHUP)) {
1.104 djm 2033: len = write(out, sshbuf_ptr(oqueue), olen);
1.134 djm 2034: if (len == 0 || (len == -1 && errno == EPIPE)) {
2035: debug("write eof");
2036: sftp_server_cleanup_exit(0);
2037: } else if (len == -1) {
1.76 markus 2038: sftp_server_cleanup_exit(1);
1.134 djm 2039: if (errno != EAGAIN && errno != EINTR) {
2040: error("write: %s", strerror(errno));
2041: sftp_server_cleanup_exit(1);
2042: }
1.120 djm 2043: } else if ((r = sshbuf_consume(oqueue, len)) != 0)
2044: fatal_fr(r, "consume");
1.1 markus 2045: }
1.73 djm 2046:
2047: /*
2048: * Process requests from client if we can fit the results
2049: * into the output buffer, otherwise stop processing input
2050: * and let the output queue drain.
2051: */
1.104 djm 2052: r = sshbuf_check_reserve(oqueue, SFTP_MAX_MSG_LENGTH);
2053: if (r == 0)
1.73 djm 2054: process();
1.104 djm 2055: else if (r != SSH_ERR_NO_BUFFER_SPACE)
1.120 djm 2056: fatal_fr(r, "reserve");
1.1 markus 2057: }
2058: }
![[BACK]](/icons/back.gif){kind=icon}
Return to sftp-server.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / ssh