mirror of
http://galexander.org/git/simplesshd.git
synced 2024-12-29 09:28:07 +00:00
1400 lines
30 KiB
C
1400 lines
30 KiB
C
/* $OpenBSD: sftp-server.c,v 1.103 2014/01/17 06:23:24 dtucker Exp $ */
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/*
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* Copyright (c) 2000-2004 Markus Friedl. All rights reserved.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "includes.h"
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/stat.h>
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#ifdef HAVE_SYS_TIME_H
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# include <sys/time.h>
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#endif
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#ifdef HAVE_SYS_MOUNT_H
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#include <sys/mount.h>
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#endif
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#ifdef HAVE_SYS_PRCTL_H
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#include <sys/prctl.h>
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#endif
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include <stdarg.h>
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#include "xmalloc.h"
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#include "buffer.h"
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#include "misc.h"
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#include "match.h"
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#include "sftp.h"
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#include "sftp-common.h"
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/* helper */
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#define get_int64() buffer_get_int64(&iqueue);
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#define get_int() buffer_get_int(&iqueue);
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#define get_string(lenp) buffer_get_string(&iqueue, lenp);
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/* Our client */
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static char *client_addr = NULL;
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/* input and output queue */
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static Buffer iqueue;
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static Buffer oqueue;
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/* Version of client */
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static u_int version;
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/* SSH2_FXP_INIT received */
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static int init_done;
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/* Disable writes */
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static int readonly;
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/* Requests that are allowed/denied */
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static char *request_whitelist, *request_blacklist;
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/* portable attributes, etc. */
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typedef struct Stat Stat;
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struct Stat {
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char *name;
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char *long_name;
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Attrib attrib;
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};
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/* Packet handlers */
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static void process_open(u_int32_t id);
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static void process_close(u_int32_t id);
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static void process_read(u_int32_t id);
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static void process_write(u_int32_t id);
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static void process_stat(u_int32_t id);
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static void process_lstat(u_int32_t id);
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static void process_fstat(u_int32_t id);
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static void process_setstat(u_int32_t id);
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static void process_fsetstat(u_int32_t id);
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static void process_opendir(u_int32_t id);
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static void process_readdir(u_int32_t id);
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static void process_remove(u_int32_t id);
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static void process_mkdir(u_int32_t id);
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static void process_rmdir(u_int32_t id);
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static void process_realpath(u_int32_t id);
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static void process_rename(u_int32_t id);
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static void process_readlink(u_int32_t id);
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static void process_symlink(u_int32_t id);
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static void process_extended_posix_rename(u_int32_t id);
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static void process_extended_hardlink(u_int32_t id);
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static void process_extended_fsync(u_int32_t id);
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static void process_extended(u_int32_t id);
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struct sftp_handler {
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const char *name; /* user-visible name for fine-grained perms */
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const char *ext_name; /* extended request name */
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u_int type; /* packet type, for non extended packets */
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void (*handler)(u_int32_t);
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int does_write; /* if nonzero, banned for readonly mode */
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};
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struct sftp_handler handlers[] = {
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/* NB. SSH2_FXP_OPEN does the readonly check in the handler itself */
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{ "open", NULL, SSH2_FXP_OPEN, process_open, 0 },
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{ "close", NULL, SSH2_FXP_CLOSE, process_close, 0 },
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{ "read", NULL, SSH2_FXP_READ, process_read, 0 },
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{ "write", NULL, SSH2_FXP_WRITE, process_write, 1 },
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{ "lstat", NULL, SSH2_FXP_LSTAT, process_lstat, 0 },
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{ "fstat", NULL, SSH2_FXP_FSTAT, process_fstat, 0 },
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{ "setstat", NULL, SSH2_FXP_SETSTAT, process_setstat, 1 },
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{ "fsetstat", NULL, SSH2_FXP_FSETSTAT, process_fsetstat, 1 },
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{ "opendir", NULL, SSH2_FXP_OPENDIR, process_opendir, 0 },
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{ "readdir", NULL, SSH2_FXP_READDIR, process_readdir, 0 },
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{ "remove", NULL, SSH2_FXP_REMOVE, process_remove, 1 },
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{ "mkdir", NULL, SSH2_FXP_MKDIR, process_mkdir, 1 },
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{ "rmdir", NULL, SSH2_FXP_RMDIR, process_rmdir, 1 },
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{ "realpath", NULL, SSH2_FXP_REALPATH, process_realpath, 0 },
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{ "stat", NULL, SSH2_FXP_STAT, process_stat, 0 },
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{ "rename", NULL, SSH2_FXP_RENAME, process_rename, 1 },
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{ "readlink", NULL, SSH2_FXP_READLINK, process_readlink, 0 },
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{ "symlink", NULL, SSH2_FXP_SYMLINK, process_symlink, 1 },
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{ NULL, NULL, 0, NULL, 0 }
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};
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/* SSH2_FXP_EXTENDED submessages */
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struct sftp_handler extended_handlers[] = {
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{ "posix-rename", "posix-rename@openssh.com", 0,
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process_extended_posix_rename, 1 },
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{ "hardlink", "hardlink@openssh.com", 0, process_extended_hardlink, 1 },
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{ "fsync", "fsync@openssh.com", 0, process_extended_fsync, 1 },
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{ NULL, NULL, 0, NULL, 0 }
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};
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static int
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request_permitted(struct sftp_handler *h)
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{
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char *result;
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if (readonly && h->does_write) {
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return 0;
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}
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if (request_blacklist != NULL &&
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((result = match_list(h->name, request_blacklist, NULL))) != NULL) {
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free(result);
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return 0;
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}
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if (request_whitelist != NULL &&
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((result = match_list(h->name, request_whitelist, NULL))) != NULL) {
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free(result);
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return 1;
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}
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if (request_whitelist != NULL) {
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return 0;
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}
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return 1;
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}
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static int
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errno_to_portable(int unixerrno)
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{
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int ret = 0;
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switch (unixerrno) {
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case 0:
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ret = SSH2_FX_OK;
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break;
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case ENOENT:
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case ENOTDIR:
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case EBADF:
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case ELOOP:
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ret = SSH2_FX_NO_SUCH_FILE;
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break;
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case EPERM:
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case EACCES:
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case EFAULT:
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ret = SSH2_FX_PERMISSION_DENIED;
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break;
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case ENAMETOOLONG:
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case EINVAL:
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ret = SSH2_FX_BAD_MESSAGE;
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break;
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case ENOSYS:
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ret = SSH2_FX_OP_UNSUPPORTED;
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break;
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default:
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ret = SSH2_FX_FAILURE;
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break;
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}
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return ret;
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}
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static int
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flags_from_portable(int pflags)
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{
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int flags = 0;
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if ((pflags & SSH2_FXF_READ) &&
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(pflags & SSH2_FXF_WRITE)) {
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flags = O_RDWR;
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} else if (pflags & SSH2_FXF_READ) {
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flags = O_RDONLY;
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} else if (pflags & SSH2_FXF_WRITE) {
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flags = O_WRONLY;
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}
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if (pflags & SSH2_FXF_APPEND)
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flags |= O_APPEND;
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if (pflags & SSH2_FXF_CREAT)
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flags |= O_CREAT;
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if (pflags & SSH2_FXF_TRUNC)
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flags |= O_TRUNC;
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if (pflags & SSH2_FXF_EXCL)
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flags |= O_EXCL;
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return flags;
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}
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static const char *
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string_from_portable(int pflags)
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{
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static char ret[128];
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*ret = '\0';
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#define PAPPEND(str) { \
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if (*ret != '\0') \
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strlcat(ret, ",", sizeof(ret)); \
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strlcat(ret, str, sizeof(ret)); \
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}
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if (pflags & SSH2_FXF_READ)
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PAPPEND("READ")
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if (pflags & SSH2_FXF_WRITE)
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PAPPEND("WRITE")
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if (pflags & SSH2_FXF_APPEND)
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PAPPEND("APPEND")
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if (pflags & SSH2_FXF_CREAT)
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PAPPEND("CREATE")
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if (pflags & SSH2_FXF_TRUNC)
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PAPPEND("TRUNCATE")
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if (pflags & SSH2_FXF_EXCL)
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PAPPEND("EXCL")
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return ret;
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}
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static Attrib *
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get_attrib(void)
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{
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return decode_attrib(&iqueue);
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}
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/* handle handles */
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typedef struct Handle Handle;
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struct Handle {
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int use;
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DIR *dirp;
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int fd;
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int flags;
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char *name;
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u_int64_t bytes_read, bytes_write;
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int next_unused;
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};
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enum {
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HANDLE_UNUSED,
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HANDLE_DIR,
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HANDLE_FILE
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};
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Handle *handles = NULL;
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u_int num_handles = 0;
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int first_unused_handle = -1;
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static void handle_unused(int i)
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{
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handles[i].use = HANDLE_UNUSED;
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handles[i].next_unused = first_unused_handle;
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first_unused_handle = i;
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}
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static int
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handle_new(int use, const char *name, int fd, int flags, DIR *dirp)
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{
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int i;
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if (first_unused_handle == -1) {
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if (num_handles + 1 <= num_handles)
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return -1;
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num_handles++;
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handles = xrealloc(handles, num_handles, sizeof(Handle));
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handle_unused(num_handles - 1);
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}
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i = first_unused_handle;
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first_unused_handle = handles[i].next_unused;
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handles[i].use = use;
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handles[i].dirp = dirp;
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handles[i].fd = fd;
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handles[i].flags = flags;
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handles[i].name = xstrdup(name);
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handles[i].bytes_read = handles[i].bytes_write = 0;
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return i;
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}
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static int
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handle_is_ok(int i, int type)
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{
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return i >= 0 && (u_int)i < num_handles && handles[i].use == type;
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}
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static int
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handle_to_string(int handle, char **stringp, int *hlenp)
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{
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if (stringp == NULL || hlenp == NULL)
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return -1;
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*stringp = xmalloc(sizeof(int32_t));
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put_u32(*stringp, handle);
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*hlenp = sizeof(int32_t);
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return 0;
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}
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static int
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handle_from_string(const char *handle, u_int hlen)
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{
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int val;
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if (hlen != sizeof(int32_t))
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return -1;
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val = get_u32(handle);
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if (handle_is_ok(val, HANDLE_FILE) ||
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handle_is_ok(val, HANDLE_DIR))
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return val;
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return -1;
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}
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static char *
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handle_to_name(int handle)
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{
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if (handle_is_ok(handle, HANDLE_DIR)||
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handle_is_ok(handle, HANDLE_FILE))
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return handles[handle].name;
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return NULL;
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}
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static DIR *
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handle_to_dir(int handle)
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{
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if (handle_is_ok(handle, HANDLE_DIR))
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return handles[handle].dirp;
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return NULL;
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}
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static int
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handle_to_fd(int handle)
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{
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if (handle_is_ok(handle, HANDLE_FILE))
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return handles[handle].fd;
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return -1;
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}
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static int
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handle_to_flags(int handle)
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{
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if (handle_is_ok(handle, HANDLE_FILE))
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return handles[handle].flags;
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return 0;
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}
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static void
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handle_update_read(int handle, ssize_t bytes)
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{
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if (handle_is_ok(handle, HANDLE_FILE) && bytes > 0)
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handles[handle].bytes_read += bytes;
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}
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static void
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handle_update_write(int handle, ssize_t bytes)
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{
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if (handle_is_ok(handle, HANDLE_FILE) && bytes > 0)
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handles[handle].bytes_write += bytes;
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}
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static u_int64_t
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handle_bytes_read(int handle)
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{
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if (handle_is_ok(handle, HANDLE_FILE))
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return (handles[handle].bytes_read);
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return 0;
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}
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static u_int64_t
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handle_bytes_write(int handle)
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{
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if (handle_is_ok(handle, HANDLE_FILE))
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return (handles[handle].bytes_write);
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return 0;
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}
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static int
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handle_close(int handle)
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{
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int ret = -1;
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if (handle_is_ok(handle, HANDLE_FILE)) {
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ret = close(handles[handle].fd);
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free(handles[handle].name);
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handle_unused(handle);
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} else if (handle_is_ok(handle, HANDLE_DIR)) {
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ret = closedir(handles[handle].dirp);
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free(handles[handle].name);
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handle_unused(handle);
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} else {
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errno = ENOENT;
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}
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return ret;
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}
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static int
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get_handle(void)
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{
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char *handle;
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int val = -1;
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u_int hlen;
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handle = get_string(&hlen);
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if (hlen < 256)
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val = handle_from_string(handle, hlen);
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free(handle);
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return val;
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}
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/* send replies */
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static void
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send_msg(Buffer *m)
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{
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int mlen = buffer_len(m);
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buffer_put_int(&oqueue, mlen);
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buffer_append(&oqueue, buffer_ptr(m), mlen);
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buffer_consume(m, mlen);
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}
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static const char *
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status_to_message(u_int32_t status)
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{
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const char *status_messages[] = {
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"Success", /* SSH_FX_OK */
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"End of file", /* SSH_FX_EOF */
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"No such file", /* SSH_FX_NO_SUCH_FILE */
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"Permission denied", /* SSH_FX_PERMISSION_DENIED */
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"Failure", /* SSH_FX_FAILURE */
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"Bad message", /* SSH_FX_BAD_MESSAGE */
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"No connection", /* SSH_FX_NO_CONNECTION */
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"Connection lost", /* SSH_FX_CONNECTION_LOST */
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"Operation unsupported", /* SSH_FX_OP_UNSUPPORTED */
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"Unknown error" /* Others */
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};
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return (status_messages[MIN(status,SSH2_FX_MAX)]);
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}
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static void
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send_status(u_int32_t id, u_int32_t status)
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{
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Buffer msg;
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buffer_init(&msg);
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buffer_put_char(&msg, SSH2_FXP_STATUS);
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buffer_put_int(&msg, id);
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buffer_put_int(&msg, status);
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if (version >= 3) {
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buffer_put_cstring(&msg, status_to_message(status));
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buffer_put_cstring(&msg, "");
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}
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send_msg(&msg);
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buffer_free(&msg);
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}
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static void
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send_data_or_handle(char type, u_int32_t id, const char *data, int dlen)
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{
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Buffer msg;
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buffer_init(&msg);
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buffer_put_char(&msg, type);
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buffer_put_int(&msg, id);
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buffer_put_string(&msg, data, dlen);
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send_msg(&msg);
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buffer_free(&msg);
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}
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static void
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send_data(u_int32_t id, const char *data, int dlen)
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{
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send_data_or_handle(SSH2_FXP_DATA, id, data, dlen);
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}
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static void
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send_handle(u_int32_t id, int handle)
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{
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char *string;
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int hlen;
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handle_to_string(handle, &string, &hlen);
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send_data_or_handle(SSH2_FXP_HANDLE, id, string, hlen);
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free(string);
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}
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static void
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send_names(u_int32_t id, int count, const Stat *stats)
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{
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Buffer msg;
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int i;
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buffer_init(&msg);
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buffer_put_char(&msg, SSH2_FXP_NAME);
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buffer_put_int(&msg, id);
|
|
buffer_put_int(&msg, count);
|
|
for (i = 0; i < count; i++) {
|
|
buffer_put_cstring(&msg, stats[i].name);
|
|
buffer_put_cstring(&msg, stats[i].long_name);
|
|
encode_attrib(&msg, &stats[i].attrib);
|
|
}
|
|
send_msg(&msg);
|
|
buffer_free(&msg);
|
|
}
|
|
|
|
static void
|
|
send_attrib(u_int32_t id, const Attrib *a)
|
|
{
|
|
Buffer msg;
|
|
|
|
buffer_init(&msg);
|
|
buffer_put_char(&msg, SSH2_FXP_ATTRS);
|
|
buffer_put_int(&msg, id);
|
|
encode_attrib(&msg, a);
|
|
send_msg(&msg);
|
|
buffer_free(&msg);
|
|
}
|
|
|
|
|
|
/* parse incoming */
|
|
|
|
static void
|
|
process_init(void)
|
|
{
|
|
Buffer msg;
|
|
|
|
version = get_int();
|
|
buffer_init(&msg);
|
|
buffer_put_char(&msg, SSH2_FXP_VERSION);
|
|
buffer_put_int(&msg, SSH2_FILEXFER_VERSION);
|
|
/* POSIX rename extension */
|
|
buffer_put_cstring(&msg, "posix-rename@openssh.com");
|
|
buffer_put_cstring(&msg, "1"); /* version */
|
|
/* hardlink extension */
|
|
buffer_put_cstring(&msg, "hardlink@openssh.com");
|
|
buffer_put_cstring(&msg, "1"); /* version */
|
|
/* fsync extension */
|
|
buffer_put_cstring(&msg, "fsync@openssh.com");
|
|
buffer_put_cstring(&msg, "1"); /* version */
|
|
send_msg(&msg);
|
|
buffer_free(&msg);
|
|
}
|
|
|
|
static void
|
|
process_open(u_int32_t id)
|
|
{
|
|
u_int32_t pflags;
|
|
Attrib *a;
|
|
char *name;
|
|
int handle, fd, flags, mode, status = SSH2_FX_FAILURE;
|
|
|
|
name = get_string(NULL);
|
|
pflags = get_int(); /* portable flags */
|
|
a = get_attrib();
|
|
flags = flags_from_portable(pflags);
|
|
mode = (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ? a->perm : 0666;
|
|
if (readonly &&
|
|
((flags & O_ACCMODE) == O_WRONLY ||
|
|
(flags & O_ACCMODE) == O_RDWR)) {
|
|
status = SSH2_FX_PERMISSION_DENIED;
|
|
} else {
|
|
fd = open(name, flags, mode);
|
|
if (fd < 0) {
|
|
status = errno_to_portable(errno);
|
|
} else {
|
|
handle = handle_new(HANDLE_FILE, name, fd, flags, NULL);
|
|
if (handle < 0) {
|
|
close(fd);
|
|
} else {
|
|
send_handle(id, handle);
|
|
status = SSH2_FX_OK;
|
|
}
|
|
}
|
|
}
|
|
if (status != SSH2_FX_OK)
|
|
send_status(id, status);
|
|
free(name);
|
|
}
|
|
|
|
static void
|
|
process_close(u_int32_t id)
|
|
{
|
|
int handle, ret, status = SSH2_FX_FAILURE;
|
|
|
|
handle = get_handle();
|
|
ret = handle_close(handle);
|
|
status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
|
|
send_status(id, status);
|
|
}
|
|
|
|
static void
|
|
process_read(u_int32_t id)
|
|
{
|
|
char buf[64*1024];
|
|
u_int32_t len;
|
|
int handle, fd, ret, status = SSH2_FX_FAILURE;
|
|
u_int64_t off;
|
|
|
|
handle = get_handle();
|
|
off = get_int64();
|
|
len = get_int();
|
|
|
|
if (len > sizeof buf) {
|
|
len = sizeof buf;
|
|
}
|
|
fd = handle_to_fd(handle);
|
|
if (fd >= 0) {
|
|
if (lseek(fd, off, SEEK_SET) < 0) {
|
|
error("process_read: seek failed");
|
|
status = errno_to_portable(errno);
|
|
} else {
|
|
ret = read(fd, buf, len);
|
|
if (ret < 0) {
|
|
status = errno_to_portable(errno);
|
|
} else if (ret == 0) {
|
|
status = SSH2_FX_EOF;
|
|
} else {
|
|
send_data(id, buf, ret);
|
|
status = SSH2_FX_OK;
|
|
handle_update_read(handle, ret);
|
|
}
|
|
}
|
|
}
|
|
if (status != SSH2_FX_OK)
|
|
send_status(id, status);
|
|
}
|
|
|
|
static void
|
|
process_write(u_int32_t id)
|
|
{
|
|
u_int64_t off;
|
|
u_int len;
|
|
int handle, fd, ret, status;
|
|
char *data;
|
|
|
|
handle = get_handle();
|
|
off = get_int64();
|
|
data = get_string(&len);
|
|
|
|
fd = handle_to_fd(handle);
|
|
|
|
if (fd < 0)
|
|
status = SSH2_FX_FAILURE;
|
|
else {
|
|
if (!(handle_to_flags(handle) & O_APPEND) &&
|
|
lseek(fd, off, SEEK_SET) < 0) {
|
|
status = errno_to_portable(errno);
|
|
error("process_write: seek failed");
|
|
} else {
|
|
/* XXX ATOMICIO ? */
|
|
ret = write(fd, data, len);
|
|
if (ret < 0) {
|
|
error("process_write: write failed");
|
|
status = errno_to_portable(errno);
|
|
} else if ((size_t)ret == len) {
|
|
status = SSH2_FX_OK;
|
|
handle_update_write(handle, ret);
|
|
} else {
|
|
status = SSH2_FX_FAILURE;
|
|
}
|
|
}
|
|
}
|
|
send_status(id, status);
|
|
free(data);
|
|
}
|
|
|
|
static void
|
|
process_do_stat(u_int32_t id, int do_lstat)
|
|
{
|
|
Attrib a;
|
|
struct stat st;
|
|
char *name;
|
|
int ret, status = SSH2_FX_FAILURE;
|
|
|
|
name = get_string(NULL);
|
|
ret = do_lstat ? lstat(name, &st) : stat(name, &st);
|
|
if (ret < 0) {
|
|
status = errno_to_portable(errno);
|
|
} else {
|
|
stat_to_attrib(&st, &a);
|
|
send_attrib(id, &a);
|
|
status = SSH2_FX_OK;
|
|
}
|
|
if (status != SSH2_FX_OK)
|
|
send_status(id, status);
|
|
free(name);
|
|
}
|
|
|
|
static void
|
|
process_stat(u_int32_t id)
|
|
{
|
|
process_do_stat(id, 0);
|
|
}
|
|
|
|
static void
|
|
process_lstat(u_int32_t id)
|
|
{
|
|
process_do_stat(id, 1);
|
|
}
|
|
|
|
static void
|
|
process_fstat(u_int32_t id)
|
|
{
|
|
Attrib a;
|
|
struct stat st;
|
|
int fd, ret, handle, status = SSH2_FX_FAILURE;
|
|
|
|
handle = get_handle();
|
|
fd = handle_to_fd(handle);
|
|
if (fd >= 0) {
|
|
ret = fstat(fd, &st);
|
|
if (ret < 0) {
|
|
status = errno_to_portable(errno);
|
|
} else {
|
|
stat_to_attrib(&st, &a);
|
|
send_attrib(id, &a);
|
|
status = SSH2_FX_OK;
|
|
}
|
|
}
|
|
if (status != SSH2_FX_OK)
|
|
send_status(id, status);
|
|
}
|
|
|
|
static struct timeval *
|
|
attrib_to_tv(const Attrib *a)
|
|
{
|
|
static struct timeval tv[2];
|
|
|
|
tv[0].tv_sec = a->atime;
|
|
tv[0].tv_usec = 0;
|
|
tv[1].tv_sec = a->mtime;
|
|
tv[1].tv_usec = 0;
|
|
return tv;
|
|
}
|
|
|
|
static void
|
|
process_setstat(u_int32_t id)
|
|
{
|
|
Attrib *a;
|
|
char *name;
|
|
int status = SSH2_FX_OK, ret;
|
|
|
|
name = get_string(NULL);
|
|
a = get_attrib();
|
|
if (a->flags & SSH2_FILEXFER_ATTR_SIZE) {
|
|
ret = truncate(name, a->size);
|
|
if (ret == -1)
|
|
status = errno_to_portable(errno);
|
|
}
|
|
if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
|
|
ret = chmod(name, a->perm & 07777);
|
|
if (ret == -1)
|
|
status = errno_to_portable(errno);
|
|
}
|
|
if (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
|
|
char buf[64];
|
|
time_t t = a->mtime;
|
|
|
|
strftime(buf, sizeof(buf), "%Y%m%d-%H:%M:%S",
|
|
localtime(&t));
|
|
ret = utimes(name, attrib_to_tv(a));
|
|
if (ret == -1)
|
|
status = errno_to_portable(errno);
|
|
}
|
|
if (a->flags & SSH2_FILEXFER_ATTR_UIDGID) {
|
|
ret = chown(name, a->uid, a->gid);
|
|
if (ret == -1)
|
|
status = errno_to_portable(errno);
|
|
}
|
|
send_status(id, status);
|
|
free(name);
|
|
}
|
|
|
|
static void
|
|
process_fsetstat(u_int32_t id)
|
|
{
|
|
Attrib *a;
|
|
int handle, fd, ret;
|
|
int status = SSH2_FX_OK;
|
|
|
|
handle = get_handle();
|
|
a = get_attrib();
|
|
fd = handle_to_fd(handle);
|
|
if (fd < 0)
|
|
status = SSH2_FX_FAILURE;
|
|
else {
|
|
char *name = handle_to_name(handle);
|
|
|
|
if (a->flags & SSH2_FILEXFER_ATTR_SIZE) {
|
|
ret = ftruncate(fd, a->size);
|
|
if (ret == -1)
|
|
status = errno_to_portable(errno);
|
|
}
|
|
if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
|
|
#ifdef HAVE_FCHMOD
|
|
ret = fchmod(fd, a->perm & 07777);
|
|
#else
|
|
ret = chmod(name, a->perm & 07777);
|
|
#endif
|
|
if (ret == -1)
|
|
status = errno_to_portable(errno);
|
|
}
|
|
if (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME) {
|
|
#ifdef HAVE_FUTIMES
|
|
ret = futimes(fd, attrib_to_tv(a));
|
|
#else
|
|
ret = utimes(name, attrib_to_tv(a));
|
|
#endif
|
|
if (ret == -1)
|
|
status = errno_to_portable(errno);
|
|
}
|
|
if (a->flags & SSH2_FILEXFER_ATTR_UIDGID) {
|
|
#ifdef HAVE_FCHOWN
|
|
ret = fchown(fd, a->uid, a->gid);
|
|
#else
|
|
ret = chown(name, a->uid, a->gid);
|
|
#endif
|
|
if (ret == -1)
|
|
status = errno_to_portable(errno);
|
|
}
|
|
}
|
|
send_status(id, status);
|
|
}
|
|
|
|
static void
|
|
process_opendir(u_int32_t id)
|
|
{
|
|
DIR *dirp = NULL;
|
|
char *path;
|
|
int handle, status = SSH2_FX_FAILURE;
|
|
|
|
path = get_string(NULL);
|
|
dirp = opendir(path);
|
|
if (dirp == NULL) {
|
|
status = errno_to_portable(errno);
|
|
} else {
|
|
handle = handle_new(HANDLE_DIR, path, 0, 0, dirp);
|
|
if (handle < 0) {
|
|
closedir(dirp);
|
|
} else {
|
|
send_handle(id, handle);
|
|
status = SSH2_FX_OK;
|
|
}
|
|
|
|
}
|
|
if (status != SSH2_FX_OK)
|
|
send_status(id, status);
|
|
free(path);
|
|
}
|
|
|
|
static void
|
|
process_readdir(u_int32_t id)
|
|
{
|
|
DIR *dirp;
|
|
struct dirent *dp;
|
|
char *path;
|
|
int handle;
|
|
|
|
handle = get_handle();
|
|
dirp = handle_to_dir(handle);
|
|
path = handle_to_name(handle);
|
|
if (dirp == NULL || path == NULL) {
|
|
send_status(id, SSH2_FX_FAILURE);
|
|
} else {
|
|
struct stat st;
|
|
char pathname[MAXPATHLEN];
|
|
Stat *stats;
|
|
int nstats = 10, count = 0, i;
|
|
|
|
stats = xcalloc(nstats, sizeof(Stat));
|
|
while ((dp = readdir(dirp)) != NULL) {
|
|
if (count >= nstats) {
|
|
nstats *= 2;
|
|
stats = xrealloc(stats, nstats, sizeof(Stat));
|
|
}
|
|
/* XXX OVERFLOW ? */
|
|
snprintf(pathname, sizeof pathname, "%s%s%s", path,
|
|
strcmp(path, "/") ? "/" : "", dp->d_name);
|
|
if (lstat(pathname, &st) < 0)
|
|
continue;
|
|
stat_to_attrib(&st, &(stats[count].attrib));
|
|
stats[count].name = xstrdup(dp->d_name);
|
|
stats[count].long_name = ls_file(dp->d_name, &st, 0, 0);
|
|
count++;
|
|
/* send up to 100 entries in one message */
|
|
/* XXX check packet size instead */
|
|
if (count == 100)
|
|
break;
|
|
}
|
|
if (count > 0) {
|
|
send_names(id, count, stats);
|
|
for (i = 0; i < count; i++) {
|
|
free(stats[i].name);
|
|
free(stats[i].long_name);
|
|
}
|
|
} else {
|
|
send_status(id, SSH2_FX_EOF);
|
|
}
|
|
free(stats);
|
|
}
|
|
}
|
|
|
|
static void
|
|
process_remove(u_int32_t id)
|
|
{
|
|
char *name;
|
|
int status = SSH2_FX_FAILURE;
|
|
int ret;
|
|
|
|
name = get_string(NULL);
|
|
ret = unlink(name);
|
|
status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
|
|
send_status(id, status);
|
|
free(name);
|
|
}
|
|
|
|
static void
|
|
process_mkdir(u_int32_t id)
|
|
{
|
|
Attrib *a;
|
|
char *name;
|
|
int ret, mode, status = SSH2_FX_FAILURE;
|
|
|
|
name = get_string(NULL);
|
|
a = get_attrib();
|
|
mode = (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ?
|
|
a->perm & 07777 : 0777;
|
|
ret = mkdir(name, mode);
|
|
status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
|
|
send_status(id, status);
|
|
free(name);
|
|
}
|
|
|
|
static void
|
|
process_rmdir(u_int32_t id)
|
|
{
|
|
char *name;
|
|
int ret, status;
|
|
|
|
name = get_string(NULL);
|
|
ret = rmdir(name);
|
|
status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
|
|
send_status(id, status);
|
|
free(name);
|
|
}
|
|
|
|
static void
|
|
process_realpath(u_int32_t id)
|
|
{
|
|
char resolvedname[MAXPATHLEN];
|
|
char *path;
|
|
|
|
path = get_string(NULL);
|
|
if (path[0] == '\0') {
|
|
free(path);
|
|
path = xstrdup(".");
|
|
}
|
|
if (realpath(path, resolvedname) == NULL) {
|
|
send_status(id, errno_to_portable(errno));
|
|
} else {
|
|
Stat s;
|
|
attrib_clear(&s.attrib);
|
|
s.name = s.long_name = resolvedname;
|
|
send_names(id, 1, &s);
|
|
}
|
|
free(path);
|
|
}
|
|
|
|
static void
|
|
process_rename(u_int32_t id)
|
|
{
|
|
char *oldpath, *newpath;
|
|
int status;
|
|
struct stat sb;
|
|
|
|
oldpath = get_string(NULL);
|
|
newpath = get_string(NULL);
|
|
status = SSH2_FX_FAILURE;
|
|
if (lstat(oldpath, &sb) == -1)
|
|
status = errno_to_portable(errno);
|
|
else if (S_ISREG(sb.st_mode)) {
|
|
/* Race-free rename of regular files */
|
|
if (link(oldpath, newpath) == -1) {
|
|
if (errno == EOPNOTSUPP || errno == ENOSYS
|
|
#ifdef EXDEV
|
|
|| errno == EXDEV
|
|
#endif
|
|
#ifdef LINK_OPNOTSUPP_ERRNO
|
|
|| errno == LINK_OPNOTSUPP_ERRNO
|
|
#endif
|
|
) {
|
|
struct stat st;
|
|
|
|
/*
|
|
* fs doesn't support links, so fall back to
|
|
* stat+rename. This is racy.
|
|
*/
|
|
if (stat(newpath, &st) == -1) {
|
|
if (rename(oldpath, newpath) == -1)
|
|
status =
|
|
errno_to_portable(errno);
|
|
else
|
|
status = SSH2_FX_OK;
|
|
}
|
|
} else {
|
|
status = errno_to_portable(errno);
|
|
}
|
|
} else if (unlink(oldpath) == -1) {
|
|
status = errno_to_portable(errno);
|
|
/* clean spare link */
|
|
unlink(newpath);
|
|
} else
|
|
status = SSH2_FX_OK;
|
|
} else if (stat(newpath, &sb) == -1) {
|
|
if (rename(oldpath, newpath) == -1)
|
|
status = errno_to_portable(errno);
|
|
else
|
|
status = SSH2_FX_OK;
|
|
}
|
|
send_status(id, status);
|
|
free(oldpath);
|
|
free(newpath);
|
|
}
|
|
|
|
static void
|
|
process_readlink(u_int32_t id)
|
|
{
|
|
int len;
|
|
char buf[MAXPATHLEN];
|
|
char *path;
|
|
|
|
path = get_string(NULL);
|
|
if ((len = readlink(path, buf, sizeof(buf) - 1)) == -1)
|
|
send_status(id, errno_to_portable(errno));
|
|
else {
|
|
Stat s;
|
|
|
|
buf[len] = '\0';
|
|
attrib_clear(&s.attrib);
|
|
s.name = s.long_name = buf;
|
|
send_names(id, 1, &s);
|
|
}
|
|
free(path);
|
|
}
|
|
|
|
static void
|
|
process_symlink(u_int32_t id)
|
|
{
|
|
char *oldpath, *newpath;
|
|
int ret, status;
|
|
|
|
oldpath = get_string(NULL);
|
|
newpath = get_string(NULL);
|
|
/* this will fail if 'newpath' exists */
|
|
ret = symlink(oldpath, newpath);
|
|
status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
|
|
send_status(id, status);
|
|
free(oldpath);
|
|
free(newpath);
|
|
}
|
|
|
|
static void
|
|
process_extended_posix_rename(u_int32_t id)
|
|
{
|
|
char *oldpath, *newpath;
|
|
int ret, status;
|
|
|
|
oldpath = get_string(NULL);
|
|
newpath = get_string(NULL);
|
|
ret = rename(oldpath, newpath);
|
|
status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
|
|
send_status(id, status);
|
|
free(oldpath);
|
|
free(newpath);
|
|
}
|
|
|
|
static void
|
|
process_extended_hardlink(u_int32_t id)
|
|
{
|
|
char *oldpath, *newpath;
|
|
int ret, status;
|
|
|
|
oldpath = get_string(NULL);
|
|
newpath = get_string(NULL);
|
|
ret = link(oldpath, newpath);
|
|
status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
|
|
send_status(id, status);
|
|
free(oldpath);
|
|
free(newpath);
|
|
}
|
|
|
|
static void
|
|
process_extended_fsync(u_int32_t id)
|
|
{
|
|
int handle, fd, ret, status = SSH2_FX_OP_UNSUPPORTED;
|
|
|
|
handle = get_handle();
|
|
if ((fd = handle_to_fd(handle)) < 0)
|
|
status = SSH2_FX_NO_SUCH_FILE;
|
|
else if (handle_is_ok(handle, HANDLE_FILE)) {
|
|
ret = fsync(fd);
|
|
status = (ret == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
|
|
}
|
|
send_status(id, status);
|
|
}
|
|
|
|
static void
|
|
process_extended(u_int32_t id)
|
|
{
|
|
char *request;
|
|
u_int i;
|
|
|
|
request = get_string(NULL);
|
|
for (i = 0; extended_handlers[i].handler != NULL; i++) {
|
|
if (strcmp(request, extended_handlers[i].ext_name) == 0) {
|
|
if (!request_permitted(&extended_handlers[i]))
|
|
send_status(id, SSH2_FX_PERMISSION_DENIED);
|
|
else
|
|
extended_handlers[i].handler(id);
|
|
break;
|
|
}
|
|
}
|
|
if (extended_handlers[i].handler == NULL) {
|
|
error("Unknown extended request \"%.100s\"", request);
|
|
send_status(id, SSH2_FX_OP_UNSUPPORTED); /* MUST */
|
|
}
|
|
free(request);
|
|
}
|
|
|
|
/* stolen from ssh-agent */
|
|
|
|
static void
|
|
process(void)
|
|
{
|
|
u_int msg_len, buf_len, consumed, type, i;
|
|
u_char *cp;
|
|
u_int32_t id;
|
|
|
|
buf_len = buffer_len(&iqueue);
|
|
if (buf_len < 5)
|
|
return; /* Incomplete message. */
|
|
cp = buffer_ptr(&iqueue);
|
|
msg_len = get_u32(cp);
|
|
if (msg_len > SFTP_MAX_MSG_LENGTH) {
|
|
error("bad message from %s", client_addr);
|
|
sftp_server_cleanup_exit(11);
|
|
}
|
|
if (buf_len < msg_len + 4)
|
|
return;
|
|
buffer_consume(&iqueue, 4);
|
|
buf_len -= 4;
|
|
type = buffer_get_char(&iqueue);
|
|
|
|
switch (type) {
|
|
case SSH2_FXP_INIT:
|
|
process_init();
|
|
init_done = 1;
|
|
break;
|
|
case SSH2_FXP_EXTENDED:
|
|
if (!init_done)
|
|
fatal("Received extended request before init");
|
|
id = get_int();
|
|
process_extended(id);
|
|
break;
|
|
default:
|
|
if (!init_done)
|
|
fatal("Received %u request before init", type);
|
|
id = get_int();
|
|
for (i = 0; handlers[i].handler != NULL; i++) {
|
|
if (type == handlers[i].type) {
|
|
if (!request_permitted(&handlers[i])) {
|
|
send_status(id,
|
|
SSH2_FX_PERMISSION_DENIED);
|
|
} else {
|
|
handlers[i].handler(id);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
if (handlers[i].handler == NULL)
|
|
error("Unknown message %u", type);
|
|
}
|
|
/* discard the remaining bytes from the current packet */
|
|
if (buf_len < buffer_len(&iqueue)) {
|
|
error("iqueue grew unexpectedly");
|
|
sftp_server_cleanup_exit(255);
|
|
}
|
|
consumed = buf_len - buffer_len(&iqueue);
|
|
if (msg_len < consumed) {
|
|
error("msg_len %u < consumed %u", msg_len, consumed);
|
|
sftp_server_cleanup_exit(255);
|
|
}
|
|
if (msg_len > consumed)
|
|
buffer_consume(&iqueue, msg_len - consumed);
|
|
}
|
|
|
|
/* Cleanup handler that logs active handles upon normal exit */
|
|
void
|
|
sftp_server_cleanup_exit(int i)
|
|
{
|
|
_exit(i);
|
|
}
|
|
|
|
int
|
|
sftp_server_main(int argc, char **argv)
|
|
{
|
|
fd_set rsetx, wsetx;
|
|
fd_set *rset = &rsetx, *wset = &wsetx;
|
|
int i, in, out, max, ch, skipargs = 0;
|
|
ssize_t len, olen;
|
|
char *cp, *homedir = NULL, buf[4*4096];
|
|
long mask;
|
|
|
|
extern char *optarg;
|
|
|
|
while (!skipargs && (ch = getopt(argc, argv,
|
|
"d:f:l:P:p:Q:u:cehR")) != -1) {
|
|
switch (ch) {
|
|
case 'Q':
|
|
if (strcasecmp(optarg, "requests") != 0) {
|
|
fprintf(stderr, "Invalid query type\n");
|
|
exit(1);
|
|
}
|
|
for (i = 0; handlers[i].handler != NULL; i++)
|
|
printf("%s\n", handlers[i].name);
|
|
for (i = 0; extended_handlers[i].handler != NULL; i++)
|
|
printf("%s\n", extended_handlers[i].name);
|
|
exit(0);
|
|
break;
|
|
case 'R':
|
|
readonly = 1;
|
|
break;
|
|
case 'c':
|
|
/*
|
|
* Ignore all arguments if we are invoked as a
|
|
* shell using "sftp-server -c command"
|
|
*/
|
|
skipargs = 1;
|
|
break;
|
|
case 'p':
|
|
if (request_whitelist != NULL)
|
|
fatal("Permitted requests already set");
|
|
request_whitelist = xstrdup(optarg);
|
|
break;
|
|
case 'P':
|
|
if (request_blacklist != NULL)
|
|
fatal("Refused requests already set");
|
|
request_blacklist = xstrdup(optarg);
|
|
break;
|
|
case 'u':
|
|
errno = 0;
|
|
mask = strtol(optarg, &cp, 8);
|
|
if (mask < 0 || mask > 0777 || *cp != '\0' ||
|
|
cp == optarg || (mask == 0 && errno != 0))
|
|
fatal("Invalid umask \"%s\"", optarg);
|
|
(void)umask((mode_t)mask);
|
|
break;
|
|
}
|
|
}
|
|
|
|
#if defined(HAVE_PRCTL) && defined(PR_SET_DUMPABLE)
|
|
/*
|
|
* On Linux, we should try to avoid making /proc/self/{mem,maps}
|
|
* available to the user so that sftp access doesn't automatically
|
|
* imply arbitrary code execution access that will break
|
|
* restricted configurations.
|
|
*/
|
|
if (prctl(PR_SET_DUMPABLE, 0) != 0)
|
|
fatal("unable to make the process undumpable");
|
|
#endif /* defined(HAVE_PRCTL) && defined(PR_SET_DUMPABLE) */
|
|
|
|
if ((cp = getenv("SSH_CONNECTION")) != NULL) {
|
|
client_addr = xstrdup(cp);
|
|
if ((cp = strchr(client_addr, ' ')) == NULL) {
|
|
error("Malformed SSH_CONNECTION variable: \"%s\"",
|
|
getenv("SSH_CONNECTION"));
|
|
sftp_server_cleanup_exit(255);
|
|
}
|
|
*cp = '\0';
|
|
} else
|
|
client_addr = xstrdup("UNKNOWN");
|
|
|
|
in = STDIN_FILENO;
|
|
out = STDOUT_FILENO;
|
|
|
|
#ifdef HAVE_CYGWIN
|
|
setmode(in, O_BINARY);
|
|
setmode(out, O_BINARY);
|
|
#endif
|
|
|
|
max = 0;
|
|
if (in > max)
|
|
max = in;
|
|
if (out > max)
|
|
max = out;
|
|
|
|
buffer_init(&iqueue);
|
|
buffer_init(&oqueue);
|
|
|
|
if (homedir != NULL) {
|
|
if (chdir(homedir) != 0) {
|
|
error("chdir to \"%s\" failed: %s", homedir,
|
|
strerror(errno));
|
|
}
|
|
}
|
|
|
|
for (;;) {
|
|
FD_ZERO(rset);
|
|
FD_ZERO(wset);
|
|
|
|
/*
|
|
* Ensure that we can read a full buffer and handle
|
|
* the worst-case length packet it can generate,
|
|
* otherwise apply backpressure by stopping reads.
|
|
*/
|
|
if (buffer_check_alloc(&iqueue, sizeof(buf)) &&
|
|
buffer_check_alloc(&oqueue, SFTP_MAX_MSG_LENGTH))
|
|
FD_SET(in, rset);
|
|
|
|
olen = buffer_len(&oqueue);
|
|
if (olen > 0)
|
|
FD_SET(out, wset);
|
|
|
|
if (select(max+1, rset, wset, NULL, NULL) < 0) {
|
|
if (errno == EINTR)
|
|
continue;
|
|
error("select: %s", strerror(errno));
|
|
sftp_server_cleanup_exit(2);
|
|
}
|
|
|
|
/* copy stdin to iqueue */
|
|
if (FD_ISSET(in, rset)) {
|
|
len = read(in, buf, sizeof buf);
|
|
if (len == 0) {
|
|
sftp_server_cleanup_exit(0);
|
|
} else if (len < 0) {
|
|
error("read: %s", strerror(errno));
|
|
sftp_server_cleanup_exit(1);
|
|
} else {
|
|
buffer_append(&iqueue, buf, len);
|
|
}
|
|
}
|
|
/* send oqueue to stdout */
|
|
if (FD_ISSET(out, wset)) {
|
|
len = write(out, buffer_ptr(&oqueue), olen);
|
|
if (len < 0) {
|
|
error("write: %s", strerror(errno));
|
|
sftp_server_cleanup_exit(1);
|
|
} else {
|
|
buffer_consume(&oqueue, len);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Process requests from client if we can fit the results
|
|
* into the output buffer, otherwise stop processing input
|
|
* and let the output queue drain.
|
|
*/
|
|
if (buffer_check_alloc(&oqueue, SFTP_MAX_MSG_LENGTH))
|
|
process();
|
|
}
|
|
}
|