Some notable changes, from upstream's release notes: - sshd(8): Remove support for obsolete "host/port" syntax. - ssh(1): When prompting whether to record a new host key, accept the key fingerprint as a synonym for "yes". - ssh-keygen(1): when acting as a CA and signing certificates with an RSA key, default to using the rsa-sha2-512 signature algorithm. - ssh(1), sshd(8), ssh-keygen(1): this release removes the "ssh-rsa" (RSA/SHA1) algorithm from those accepted for certificate signatures. - ssh-sk-helper(8): this is a new binary. It is used by the FIDO/U2F support to provide address-space isolation for token middleware libraries (including the internal one). - ssh(1): this release enables UpdateHostkeys by default subject to some conservative preconditions. - scp(1): this release changes the behaviour of remote to remote copies (e.g. "scp host-a:/path host-b:") to transfer through the local host by default. - scp(1): experimental support for transfers using the SFTP protocol as a replacement for the venerable SCP/RCP protocol that it has traditionally used. Additional integration work is needed to support FIDO/U2F in the base system. Deprecation Notice ------------------ OpenSSH will disable the ssh-rsa signature scheme by default in the next release. Reviewed by: imp MFC after: 1 month Relnotes: Yes Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D29985
1912 lines
46 KiB
C
1912 lines
46 KiB
C
/* $OpenBSD: sftp-server.c,v 1.129 2021/08/09 23:47:44 djm 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/stat.h>
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#include <sys/resource.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_STATVFS_H
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#include <sys/statvfs.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 <pwd.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 "sshbuf.h"
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#include "ssherr.h"
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#include "log.h"
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#include "misc.h"
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#include "match.h"
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#include "uidswap.h"
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#include "sftp.h"
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#include "sftp-common.h"
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char *sftp_realpath(const char *, char *); /* sftp-realpath.c */
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/* Maximum data read that we are willing to accept */
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#define SFTP_MAX_READ_LENGTH (SFTP_MAX_MSG_LENGTH - 1024)
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/* Our verbosity */
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static LogLevel log_level = SYSLOG_LEVEL_ERROR;
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/* Our client */
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static struct passwd *pw = NULL;
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static char *client_addr = NULL;
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/* input and output queue */
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struct sshbuf *iqueue;
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struct sshbuf *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_allowlist, *request_denylist;
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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_statvfs(u_int32_t id);
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static void process_extended_fstatvfs(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_lsetstat(u_int32_t id);
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static void process_extended_limits(u_int32_t id);
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static void process_extended_expand(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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static const 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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static const 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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{ "statvfs", "statvfs@openssh.com", 0, process_extended_statvfs, 0 },
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{ "fstatvfs", "fstatvfs@openssh.com", 0, process_extended_fstatvfs, 0 },
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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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{ "lsetstat", "lsetstat@openssh.com", 0, process_extended_lsetstat, 1 },
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{ "limits", "limits@openssh.com", 0, process_extended_limits, 0 },
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{ "expand-path", "expand-path@openssh.com", 0,
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process_extended_expand, 0 },
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{ NULL, NULL, 0, NULL, 0 }
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};
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static const struct sftp_handler *
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extended_handler_byname(const char *name)
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{
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int i;
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for (i = 0; extended_handlers[i].handler != NULL; i++) {
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if (strcmp(name, extended_handlers[i].ext_name) == 0)
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return &extended_handlers[i];
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}
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return NULL;
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}
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static int
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request_permitted(const 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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verbose("Refusing %s request in read-only mode", h->name);
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return 0;
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}
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if (request_denylist != NULL &&
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((result = match_list(h->name, request_denylist, NULL))) != NULL) {
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free(result);
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verbose("Refusing denylisted %s request", h->name);
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return 0;
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}
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if (request_allowlist != NULL &&
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((result = match_list(h->name, request_allowlist, NULL))) != NULL) {
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free(result);
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debug2("Permitting allowlisted %s request", h->name);
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return 1;
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}
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if (request_allowlist != NULL) {
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verbose("Refusing non-allowlisted %s request", h->name);
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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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/* 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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static Handle *handles = NULL;
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static u_int num_handles = 0;
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static 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 = xreallocarray(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, u_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 u_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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|
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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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|
{
|
|
int ret = -1;
|
|
|
|
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);
|
|
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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|
}
|
|
|
|
static void
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|
handle_log_close(int handle, char *emsg)
|
|
{
|
|
if (handle_is_ok(handle, HANDLE_FILE)) {
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|
logit("%s%sclose \"%s\" bytes read %llu written %llu",
|
|
emsg == NULL ? "" : emsg, emsg == NULL ? "" : " ",
|
|
handle_to_name(handle),
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|
(unsigned long long)handle_bytes_read(handle),
|
|
(unsigned long long)handle_bytes_write(handle));
|
|
} else {
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|
logit("%s%sclosedir \"%s\"",
|
|
emsg == NULL ? "" : emsg, emsg == NULL ? "" : " ",
|
|
handle_to_name(handle));
|
|
}
|
|
}
|
|
|
|
static void
|
|
handle_log_exit(void)
|
|
{
|
|
u_int i;
|
|
|
|
for (i = 0; i < num_handles; i++)
|
|
if (handles[i].use != HANDLE_UNUSED)
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|
handle_log_close(i, "forced");
|
|
}
|
|
|
|
static int
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|
get_handle(struct sshbuf *queue, int *hp)
|
|
{
|
|
u_char *handle;
|
|
int r;
|
|
size_t hlen;
|
|
|
|
*hp = -1;
|
|
if ((r = sshbuf_get_string(queue, &handle, &hlen)) != 0)
|
|
return r;
|
|
if (hlen < 256)
|
|
*hp = handle_from_string(handle, hlen);
|
|
free(handle);
|
|
return 0;
|
|
}
|
|
|
|
/* send replies */
|
|
|
|
static void
|
|
send_msg(struct sshbuf *m)
|
|
{
|
|
int r;
|
|
|
|
if ((r = sshbuf_put_stringb(oqueue, m)) != 0)
|
|
fatal_fr(r, "enqueue");
|
|
sshbuf_reset(m);
|
|
}
|
|
|
|
static const char *
|
|
status_to_message(u_int32_t status)
|
|
{
|
|
const char *status_messages[] = {
|
|
"Success", /* SSH_FX_OK */
|
|
"End of file", /* SSH_FX_EOF */
|
|
"No such file", /* SSH_FX_NO_SUCH_FILE */
|
|
"Permission denied", /* SSH_FX_PERMISSION_DENIED */
|
|
"Failure", /* SSH_FX_FAILURE */
|
|
"Bad message", /* SSH_FX_BAD_MESSAGE */
|
|
"No connection", /* SSH_FX_NO_CONNECTION */
|
|
"Connection lost", /* SSH_FX_CONNECTION_LOST */
|
|
"Operation unsupported", /* SSH_FX_OP_UNSUPPORTED */
|
|
"Unknown error" /* Others */
|
|
};
|
|
return (status_messages[MINIMUM(status,SSH2_FX_MAX)]);
|
|
}
|
|
|
|
static void
|
|
send_status(u_int32_t id, u_int32_t status)
|
|
{
|
|
struct sshbuf *msg;
|
|
int r;
|
|
|
|
debug3("request %u: sent status %u", id, status);
|
|
if (log_level > SYSLOG_LEVEL_VERBOSE ||
|
|
(status != SSH2_FX_OK && status != SSH2_FX_EOF))
|
|
logit("sent status %s", status_to_message(status));
|
|
if ((msg = sshbuf_new()) == NULL)
|
|
fatal_f("sshbuf_new failed");
|
|
if ((r = sshbuf_put_u8(msg, SSH2_FXP_STATUS)) != 0 ||
|
|
(r = sshbuf_put_u32(msg, id)) != 0 ||
|
|
(r = sshbuf_put_u32(msg, status)) != 0)
|
|
fatal_fr(r, "compose");
|
|
if (version >= 3) {
|
|
if ((r = sshbuf_put_cstring(msg,
|
|
status_to_message(status))) != 0 ||
|
|
(r = sshbuf_put_cstring(msg, "")) != 0)
|
|
fatal_fr(r, "compose message");
|
|
}
|
|
send_msg(msg);
|
|
sshbuf_free(msg);
|
|
}
|
|
static void
|
|
send_data_or_handle(char type, u_int32_t id, const u_char *data, int dlen)
|
|
{
|
|
struct sshbuf *msg;
|
|
int r;
|
|
|
|
if ((msg = sshbuf_new()) == NULL)
|
|
fatal_f("sshbuf_new failed");
|
|
if ((r = sshbuf_put_u8(msg, type)) != 0 ||
|
|
(r = sshbuf_put_u32(msg, id)) != 0 ||
|
|
(r = sshbuf_put_string(msg, data, dlen)) != 0)
|
|
fatal_fr(r, "compose");
|
|
send_msg(msg);
|
|
sshbuf_free(msg);
|
|
}
|
|
|
|
static void
|
|
send_data(u_int32_t id, const u_char *data, int dlen)
|
|
{
|
|
debug("request %u: sent data len %d", id, dlen);
|
|
send_data_or_handle(SSH2_FXP_DATA, id, data, dlen);
|
|
}
|
|
|
|
static void
|
|
send_handle(u_int32_t id, int handle)
|
|
{
|
|
u_char *string;
|
|
int hlen;
|
|
|
|
handle_to_string(handle, &string, &hlen);
|
|
debug("request %u: sent handle handle %d", id, handle);
|
|
send_data_or_handle(SSH2_FXP_HANDLE, id, string, hlen);
|
|
free(string);
|
|
}
|
|
|
|
static void
|
|
send_names(u_int32_t id, int count, const Stat *stats)
|
|
{
|
|
struct sshbuf *msg;
|
|
int i, r;
|
|
|
|
if ((msg = sshbuf_new()) == NULL)
|
|
fatal_f("sshbuf_new failed");
|
|
if ((r = sshbuf_put_u8(msg, SSH2_FXP_NAME)) != 0 ||
|
|
(r = sshbuf_put_u32(msg, id)) != 0 ||
|
|
(r = sshbuf_put_u32(msg, count)) != 0)
|
|
fatal_fr(r, "compose");
|
|
debug("request %u: sent names count %d", id, count);
|
|
for (i = 0; i < count; i++) {
|
|
if ((r = sshbuf_put_cstring(msg, stats[i].name)) != 0 ||
|
|
(r = sshbuf_put_cstring(msg, stats[i].long_name)) != 0 ||
|
|
(r = encode_attrib(msg, &stats[i].attrib)) != 0)
|
|
fatal_fr(r, "compose filenames/attrib");
|
|
}
|
|
send_msg(msg);
|
|
sshbuf_free(msg);
|
|
}
|
|
|
|
static void
|
|
send_attrib(u_int32_t id, const Attrib *a)
|
|
{
|
|
struct sshbuf *msg;
|
|
int r;
|
|
|
|
debug("request %u: sent attrib have 0x%x", id, a->flags);
|
|
if ((msg = sshbuf_new()) == NULL)
|
|
fatal_f("sshbuf_new failed");
|
|
if ((r = sshbuf_put_u8(msg, SSH2_FXP_ATTRS)) != 0 ||
|
|
(r = sshbuf_put_u32(msg, id)) != 0 ||
|
|
(r = encode_attrib(msg, a)) != 0)
|
|
fatal_fr(r, "compose");
|
|
send_msg(msg);
|
|
sshbuf_free(msg);
|
|
}
|
|
|
|
static void
|
|
send_statvfs(u_int32_t id, struct statvfs *st)
|
|
{
|
|
struct sshbuf *msg;
|
|
u_int64_t flag;
|
|
int r;
|
|
|
|
flag = (st->f_flag & ST_RDONLY) ? SSH2_FXE_STATVFS_ST_RDONLY : 0;
|
|
flag |= (st->f_flag & ST_NOSUID) ? SSH2_FXE_STATVFS_ST_NOSUID : 0;
|
|
|
|
if ((msg = sshbuf_new()) == NULL)
|
|
fatal_f("sshbuf_new failed");
|
|
if ((r = sshbuf_put_u8(msg, SSH2_FXP_EXTENDED_REPLY)) != 0 ||
|
|
(r = sshbuf_put_u32(msg, id)) != 0 ||
|
|
(r = sshbuf_put_u64(msg, st->f_bsize)) != 0 ||
|
|
(r = sshbuf_put_u64(msg, st->f_frsize)) != 0 ||
|
|
(r = sshbuf_put_u64(msg, st->f_blocks)) != 0 ||
|
|
(r = sshbuf_put_u64(msg, st->f_bfree)) != 0 ||
|
|
(r = sshbuf_put_u64(msg, st->f_bavail)) != 0 ||
|
|
(r = sshbuf_put_u64(msg, st->f_files)) != 0 ||
|
|
(r = sshbuf_put_u64(msg, st->f_ffree)) != 0 ||
|
|
(r = sshbuf_put_u64(msg, st->f_favail)) != 0 ||
|
|
(r = sshbuf_put_u64(msg, FSID_TO_ULONG(st->f_fsid))) != 0 ||
|
|
(r = sshbuf_put_u64(msg, flag)) != 0 ||
|
|
(r = sshbuf_put_u64(msg, st->f_namemax)) != 0)
|
|
fatal_fr(r, "compose");
|
|
send_msg(msg);
|
|
sshbuf_free(msg);
|
|
}
|
|
|
|
/*
|
|
* Prepare SSH2_FXP_VERSION extension advertisement for a single extension.
|
|
* The extension is checked for permission prior to advertisment.
|
|
*/
|
|
static int
|
|
compose_extension(struct sshbuf *msg, const char *name, const char *ver)
|
|
{
|
|
int r;
|
|
const struct sftp_handler *exthnd;
|
|
|
|
if ((exthnd = extended_handler_byname(name)) == NULL)
|
|
fatal_f("internal error: no handler for %s", name);
|
|
if (!request_permitted(exthnd)) {
|
|
debug2_f("refusing to advertise disallowed extension %s", name);
|
|
return 0;
|
|
}
|
|
if ((r = sshbuf_put_cstring(msg, name)) != 0 ||
|
|
(r = sshbuf_put_cstring(msg, ver)) != 0)
|
|
fatal_fr(r, "compose %s", name);
|
|
return 0;
|
|
}
|
|
|
|
/* parse incoming */
|
|
|
|
static void
|
|
process_init(void)
|
|
{
|
|
struct sshbuf *msg;
|
|
int r;
|
|
|
|
if ((r = sshbuf_get_u32(iqueue, &version)) != 0)
|
|
fatal_fr(r, "parse");
|
|
verbose("received client version %u", version);
|
|
if ((msg = sshbuf_new()) == NULL)
|
|
fatal_f("sshbuf_new failed");
|
|
if ((r = sshbuf_put_u8(msg, SSH2_FXP_VERSION)) != 0 ||
|
|
(r = sshbuf_put_u32(msg, SSH2_FILEXFER_VERSION)) != 0)
|
|
fatal_fr(r, "compose");
|
|
|
|
/* extension advertisments */
|
|
compose_extension(msg, "posix-rename@openssh.com", "1");
|
|
compose_extension(msg, "statvfs@openssh.com", "2");
|
|
compose_extension(msg, "fstatvfs@openssh.com", "2");
|
|
compose_extension(msg, "hardlink@openssh.com", "1");
|
|
compose_extension(msg, "fsync@openssh.com", "1");
|
|
compose_extension(msg, "lsetstat@openssh.com", "1");
|
|
compose_extension(msg, "limits@openssh.com", "1");
|
|
compose_extension(msg, "expand-path@openssh.com", "1");
|
|
|
|
send_msg(msg);
|
|
sshbuf_free(msg);
|
|
}
|
|
|
|
static void
|
|
process_open(u_int32_t id)
|
|
{
|
|
u_int32_t pflags;
|
|
Attrib a;
|
|
char *name;
|
|
int r, handle, fd, flags, mode, status = SSH2_FX_FAILURE;
|
|
|
|
if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0 ||
|
|
(r = sshbuf_get_u32(iqueue, &pflags)) != 0 || /* portable flags */
|
|
(r = decode_attrib(iqueue, &a)) != 0)
|
|
fatal_fr(r, "parse");
|
|
|
|
debug3("request %u: open flags %d", id, pflags);
|
|
flags = flags_from_portable(pflags);
|
|
mode = (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ? a.perm : 0666;
|
|
logit("open \"%s\" flags %s mode 0%o",
|
|
name, string_from_portable(pflags), mode);
|
|
if (readonly &&
|
|
((flags & O_ACCMODE) != O_RDONLY ||
|
|
(flags & (O_CREAT|O_TRUNC)) != 0)) {
|
|
verbose("Refusing open request in read-only mode");
|
|
status = SSH2_FX_PERMISSION_DENIED;
|
|
} else {
|
|
fd = open(name, flags, mode);
|
|
if (fd == -1) {
|
|
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 r, handle, ret, status = SSH2_FX_FAILURE;
|
|
|
|
if ((r = get_handle(iqueue, &handle)) != 0)
|
|
fatal_fr(r, "parse");
|
|
|
|
debug3("request %u: close handle %u", id, handle);
|
|
handle_log_close(handle, NULL);
|
|
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)
|
|
{
|
|
static u_char *buf;
|
|
static size_t buflen;
|
|
u_int32_t len;
|
|
int r, handle, fd, ret, status = SSH2_FX_FAILURE;
|
|
u_int64_t off;
|
|
|
|
if ((r = get_handle(iqueue, &handle)) != 0 ||
|
|
(r = sshbuf_get_u64(iqueue, &off)) != 0 ||
|
|
(r = sshbuf_get_u32(iqueue, &len)) != 0)
|
|
fatal_fr(r, "parse");
|
|
|
|
debug("request %u: read \"%s\" (handle %d) off %llu len %u",
|
|
id, handle_to_name(handle), handle, (unsigned long long)off, len);
|
|
if ((fd = handle_to_fd(handle)) == -1)
|
|
goto out;
|
|
if (len > SFTP_MAX_READ_LENGTH) {
|
|
debug2("read change len %u to %u", len, SFTP_MAX_READ_LENGTH);
|
|
len = SFTP_MAX_READ_LENGTH;
|
|
}
|
|
if (len > buflen) {
|
|
debug3_f("allocate %zu => %u", buflen, len);
|
|
if ((buf = realloc(NULL, len)) == NULL)
|
|
fatal_f("realloc failed");
|
|
buflen = len;
|
|
}
|
|
if (lseek(fd, off, SEEK_SET) == -1) {
|
|
status = errno_to_portable(errno);
|
|
error_f("seek \"%.100s\": %s", handle_to_name(handle),
|
|
strerror(errno));
|
|
goto out;
|
|
}
|
|
if (len == 0) {
|
|
/* weird, but not strictly disallowed */
|
|
ret = 0;
|
|
} else if ((ret = read(fd, buf, len)) == -1) {
|
|
status = errno_to_portable(errno);
|
|
error_f("read \"%.100s\": %s", handle_to_name(handle),
|
|
strerror(errno));
|
|
goto out;
|
|
} else if (ret == 0) {
|
|
status = SSH2_FX_EOF;
|
|
goto out;
|
|
}
|
|
send_data(id, buf, ret);
|
|
handle_update_read(handle, ret);
|
|
/* success */
|
|
status = SSH2_FX_OK;
|
|
out:
|
|
if (status != SSH2_FX_OK)
|
|
send_status(id, status);
|
|
}
|
|
|
|
static void
|
|
process_write(u_int32_t id)
|
|
{
|
|
u_int64_t off;
|
|
size_t len;
|
|
int r, handle, fd, ret, status;
|
|
u_char *data;
|
|
|
|
if ((r = get_handle(iqueue, &handle)) != 0 ||
|
|
(r = sshbuf_get_u64(iqueue, &off)) != 0 ||
|
|
(r = sshbuf_get_string(iqueue, &data, &len)) != 0)
|
|
fatal_fr(r, "parse");
|
|
|
|
debug("request %u: write \"%s\" (handle %d) off %llu len %zu",
|
|
id, handle_to_name(handle), handle, (unsigned long long)off, 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) == -1) {
|
|
status = errno_to_portable(errno);
|
|
error_f("seek \"%.100s\": %s", handle_to_name(handle),
|
|
strerror(errno));
|
|
} else {
|
|
/* XXX ATOMICIO ? */
|
|
ret = write(fd, data, len);
|
|
if (ret == -1) {
|
|
status = errno_to_portable(errno);
|
|
error_f("write \"%.100s\": %s",
|
|
handle_to_name(handle), strerror(errno));
|
|
} else if ((size_t)ret == len) {
|
|
status = SSH2_FX_OK;
|
|
handle_update_write(handle, ret);
|
|
} else {
|
|
debug2_f("nothing at all written");
|
|
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 r, status = SSH2_FX_FAILURE;
|
|
|
|
if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0)
|
|
fatal_fr(r, "parse");
|
|
|
|
debug3("request %u: %sstat", id, do_lstat ? "l" : "");
|
|
verbose("%sstat name \"%s\"", do_lstat ? "l" : "", name);
|
|
r = do_lstat ? lstat(name, &st) : stat(name, &st);
|
|
if (r == -1) {
|
|
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, r, handle, status = SSH2_FX_FAILURE;
|
|
|
|
if ((r = get_handle(iqueue, &handle)) != 0)
|
|
fatal_fr(r, "parse");
|
|
debug("request %u: fstat \"%s\" (handle %u)",
|
|
id, handle_to_name(handle), handle);
|
|
fd = handle_to_fd(handle);
|
|
if (fd >= 0) {
|
|
r = fstat(fd, &st);
|
|
if (r == -1) {
|
|
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 struct timespec *
|
|
attrib_to_ts(const Attrib *a)
|
|
{
|
|
static struct timespec ts[2];
|
|
|
|
ts[0].tv_sec = a->atime;
|
|
ts[0].tv_nsec = 0;
|
|
ts[1].tv_sec = a->mtime;
|
|
ts[1].tv_nsec = 0;
|
|
return ts;
|
|
}
|
|
|
|
static void
|
|
process_setstat(u_int32_t id)
|
|
{
|
|
Attrib a;
|
|
char *name;
|
|
int r, status = SSH2_FX_OK;
|
|
|
|
if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0 ||
|
|
(r = decode_attrib(iqueue, &a)) != 0)
|
|
fatal_fr(r, "parse");
|
|
|
|
debug("request %u: setstat name \"%s\"", id, name);
|
|
if (a.flags & SSH2_FILEXFER_ATTR_SIZE) {
|
|
logit("set \"%s\" size %llu",
|
|
name, (unsigned long long)a.size);
|
|
r = truncate(name, a.size);
|
|
if (r == -1)
|
|
status = errno_to_portable(errno);
|
|
}
|
|
if (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
|
|
logit("set \"%s\" mode %04o", name, a.perm);
|
|
r = chmod(name, a.perm & 07777);
|
|
if (r == -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));
|
|
logit("set \"%s\" modtime %s", name, buf);
|
|
r = utimes(name, attrib_to_tv(&a));
|
|
if (r == -1)
|
|
status = errno_to_portable(errno);
|
|
}
|
|
if (a.flags & SSH2_FILEXFER_ATTR_UIDGID) {
|
|
logit("set \"%s\" owner %lu group %lu", name,
|
|
(u_long)a.uid, (u_long)a.gid);
|
|
r = chown(name, a.uid, a.gid);
|
|
if (r == -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, r;
|
|
int status = SSH2_FX_OK;
|
|
|
|
if ((r = get_handle(iqueue, &handle)) != 0 ||
|
|
(r = decode_attrib(iqueue, &a)) != 0)
|
|
fatal_fr(r, "parse");
|
|
|
|
debug("request %u: fsetstat handle %d", id, handle);
|
|
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) {
|
|
logit("set \"%s\" size %llu",
|
|
name, (unsigned long long)a.size);
|
|
r = ftruncate(fd, a.size);
|
|
if (r == -1)
|
|
status = errno_to_portable(errno);
|
|
}
|
|
if (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
|
|
logit("set \"%s\" mode %04o", name, a.perm);
|
|
#ifdef HAVE_FCHMOD
|
|
r = fchmod(fd, a.perm & 07777);
|
|
#else
|
|
r = chmod(name, a.perm & 07777);
|
|
#endif
|
|
if (r == -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));
|
|
logit("set \"%s\" modtime %s", name, buf);
|
|
#ifdef HAVE_FUTIMES
|
|
r = futimes(fd, attrib_to_tv(&a));
|
|
#else
|
|
r = utimes(name, attrib_to_tv(&a));
|
|
#endif
|
|
if (r == -1)
|
|
status = errno_to_portable(errno);
|
|
}
|
|
if (a.flags & SSH2_FILEXFER_ATTR_UIDGID) {
|
|
logit("set \"%s\" owner %lu group %lu", name,
|
|
(u_long)a.uid, (u_long)a.gid);
|
|
#ifdef HAVE_FCHOWN
|
|
r = fchown(fd, a.uid, a.gid);
|
|
#else
|
|
r = chown(name, a.uid, a.gid);
|
|
#endif
|
|
if (r == -1)
|
|
status = errno_to_portable(errno);
|
|
}
|
|
}
|
|
send_status(id, status);
|
|
}
|
|
|
|
static void
|
|
process_opendir(u_int32_t id)
|
|
{
|
|
DIR *dirp = NULL;
|
|
char *path;
|
|
int r, handle, status = SSH2_FX_FAILURE;
|
|
|
|
if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
|
|
fatal_fr(r, "parse");
|
|
|
|
debug3("request %u: opendir", id);
|
|
logit("opendir \"%s\"", path);
|
|
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 r, handle;
|
|
|
|
if ((r = get_handle(iqueue, &handle)) != 0)
|
|
fatal_fr(r, "parse");
|
|
|
|
debug("request %u: readdir \"%s\" (handle %d)", id,
|
|
handle_to_name(handle), 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[PATH_MAX];
|
|
Stat *stats;
|
|
int nstats = 10, count = 0, i;
|
|
|
|
stats = xcalloc(nstats, sizeof(Stat));
|
|
while ((dp = readdir(dirp)) != NULL) {
|
|
if (count >= nstats) {
|
|
nstats *= 2;
|
|
stats = xreallocarray(stats, nstats, sizeof(Stat));
|
|
}
|
|
/* XXX OVERFLOW ? */
|
|
snprintf(pathname, sizeof pathname, "%s%s%s", path,
|
|
strcmp(path, "/") ? "/" : "", dp->d_name);
|
|
if (lstat(pathname, &st) == -1)
|
|
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 r, status = SSH2_FX_FAILURE;
|
|
|
|
if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0)
|
|
fatal_fr(r, "parse");
|
|
|
|
debug3("request %u: remove", id);
|
|
logit("remove name \"%s\"", name);
|
|
r = unlink(name);
|
|
status = (r == -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 r, mode, status = SSH2_FX_FAILURE;
|
|
|
|
if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0 ||
|
|
(r = decode_attrib(iqueue, &a)) != 0)
|
|
fatal_fr(r, "parse");
|
|
|
|
mode = (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) ?
|
|
a.perm & 07777 : 0777;
|
|
debug3("request %u: mkdir", id);
|
|
logit("mkdir name \"%s\" mode 0%o", name, mode);
|
|
r = mkdir(name, mode);
|
|
status = (r == -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 r, status;
|
|
|
|
if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0)
|
|
fatal_fr(r, "parse");
|
|
|
|
debug3("request %u: rmdir", id);
|
|
logit("rmdir name \"%s\"", name);
|
|
r = rmdir(name);
|
|
status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
|
|
send_status(id, status);
|
|
free(name);
|
|
}
|
|
|
|
static void
|
|
process_realpath(u_int32_t id)
|
|
{
|
|
char resolvedname[PATH_MAX];
|
|
char *path;
|
|
int r;
|
|
|
|
if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
|
|
fatal_fr(r, "parse");
|
|
|
|
if (path[0] == '\0') {
|
|
free(path);
|
|
path = xstrdup(".");
|
|
}
|
|
debug3("request %u: realpath", id);
|
|
verbose("realpath \"%s\"", path);
|
|
if (sftp_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 r, status;
|
|
struct stat sb;
|
|
|
|
if ((r = sshbuf_get_cstring(iqueue, &oldpath, NULL)) != 0 ||
|
|
(r = sshbuf_get_cstring(iqueue, &newpath, NULL)) != 0)
|
|
fatal_fr(r, "parse");
|
|
|
|
debug3("request %u: rename", id);
|
|
logit("rename old \"%s\" new \"%s\"", oldpath, newpath);
|
|
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 r, len;
|
|
char buf[PATH_MAX];
|
|
char *path;
|
|
|
|
if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
|
|
fatal_fr(r, "parse");
|
|
|
|
debug3("request %u: readlink", id);
|
|
verbose("readlink \"%s\"", path);
|
|
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 r, status;
|
|
|
|
if ((r = sshbuf_get_cstring(iqueue, &oldpath, NULL)) != 0 ||
|
|
(r = sshbuf_get_cstring(iqueue, &newpath, NULL)) != 0)
|
|
fatal_fr(r, "parse");
|
|
|
|
debug3("request %u: symlink", id);
|
|
logit("symlink old \"%s\" new \"%s\"", oldpath, newpath);
|
|
/* this will fail if 'newpath' exists */
|
|
r = symlink(oldpath, newpath);
|
|
status = (r == -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 r, status;
|
|
|
|
if ((r = sshbuf_get_cstring(iqueue, &oldpath, NULL)) != 0 ||
|
|
(r = sshbuf_get_cstring(iqueue, &newpath, NULL)) != 0)
|
|
fatal_fr(r, "parse");
|
|
|
|
debug3("request %u: posix-rename", id);
|
|
logit("posix-rename old \"%s\" new \"%s\"", oldpath, newpath);
|
|
r = rename(oldpath, newpath);
|
|
status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
|
|
send_status(id, status);
|
|
free(oldpath);
|
|
free(newpath);
|
|
}
|
|
|
|
static void
|
|
process_extended_statvfs(u_int32_t id)
|
|
{
|
|
char *path;
|
|
struct statvfs st;
|
|
int r;
|
|
|
|
if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
|
|
fatal_fr(r, "parse");
|
|
debug3("request %u: statvfs", id);
|
|
logit("statvfs \"%s\"", path);
|
|
|
|
if (statvfs(path, &st) != 0)
|
|
send_status(id, errno_to_portable(errno));
|
|
else
|
|
send_statvfs(id, &st);
|
|
free(path);
|
|
}
|
|
|
|
static void
|
|
process_extended_fstatvfs(u_int32_t id)
|
|
{
|
|
int r, handle, fd;
|
|
struct statvfs st;
|
|
|
|
if ((r = get_handle(iqueue, &handle)) != 0)
|
|
fatal_fr(r, "parse");
|
|
debug("request %u: fstatvfs \"%s\" (handle %u)",
|
|
id, handle_to_name(handle), handle);
|
|
if ((fd = handle_to_fd(handle)) < 0) {
|
|
send_status(id, SSH2_FX_FAILURE);
|
|
return;
|
|
}
|
|
if (fstatvfs(fd, &st) != 0)
|
|
send_status(id, errno_to_portable(errno));
|
|
else
|
|
send_statvfs(id, &st);
|
|
}
|
|
|
|
static void
|
|
process_extended_hardlink(u_int32_t id)
|
|
{
|
|
char *oldpath, *newpath;
|
|
int r, status;
|
|
|
|
if ((r = sshbuf_get_cstring(iqueue, &oldpath, NULL)) != 0 ||
|
|
(r = sshbuf_get_cstring(iqueue, &newpath, NULL)) != 0)
|
|
fatal_fr(r, "parse");
|
|
|
|
debug3("request %u: hardlink", id);
|
|
logit("hardlink old \"%s\" new \"%s\"", oldpath, newpath);
|
|
r = link(oldpath, newpath);
|
|
status = (r == -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, r, status = SSH2_FX_OP_UNSUPPORTED;
|
|
|
|
if ((r = get_handle(iqueue, &handle)) != 0)
|
|
fatal_fr(r, "parse");
|
|
debug3("request %u: fsync (handle %u)", id, handle);
|
|
verbose("fsync \"%s\"", handle_to_name(handle));
|
|
if ((fd = handle_to_fd(handle)) < 0)
|
|
status = SSH2_FX_NO_SUCH_FILE;
|
|
else if (handle_is_ok(handle, HANDLE_FILE)) {
|
|
r = fsync(fd);
|
|
status = (r == -1) ? errno_to_portable(errno) : SSH2_FX_OK;
|
|
}
|
|
send_status(id, status);
|
|
}
|
|
|
|
static void
|
|
process_extended_lsetstat(u_int32_t id)
|
|
{
|
|
Attrib a;
|
|
char *name;
|
|
int r, status = SSH2_FX_OK;
|
|
|
|
if ((r = sshbuf_get_cstring(iqueue, &name, NULL)) != 0 ||
|
|
(r = decode_attrib(iqueue, &a)) != 0)
|
|
fatal_fr(r, "parse");
|
|
|
|
debug("request %u: lsetstat name \"%s\"", id, name);
|
|
if (a.flags & SSH2_FILEXFER_ATTR_SIZE) {
|
|
/* nonsensical for links */
|
|
status = SSH2_FX_BAD_MESSAGE;
|
|
goto out;
|
|
}
|
|
if (a.flags & SSH2_FILEXFER_ATTR_PERMISSIONS) {
|
|
logit("set \"%s\" mode %04o", name, a.perm);
|
|
r = fchmodat(AT_FDCWD, name,
|
|
a.perm & 07777, AT_SYMLINK_NOFOLLOW);
|
|
if (r == -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));
|
|
logit("set \"%s\" modtime %s", name, buf);
|
|
r = utimensat(AT_FDCWD, name,
|
|
attrib_to_ts(&a), AT_SYMLINK_NOFOLLOW);
|
|
if (r == -1)
|
|
status = errno_to_portable(errno);
|
|
}
|
|
if (a.flags & SSH2_FILEXFER_ATTR_UIDGID) {
|
|
logit("set \"%s\" owner %lu group %lu", name,
|
|
(u_long)a.uid, (u_long)a.gid);
|
|
r = fchownat(AT_FDCWD, name, a.uid, a.gid,
|
|
AT_SYMLINK_NOFOLLOW);
|
|
if (r == -1)
|
|
status = errno_to_portable(errno);
|
|
}
|
|
out:
|
|
send_status(id, status);
|
|
free(name);
|
|
}
|
|
|
|
static void
|
|
process_extended_limits(u_int32_t id)
|
|
{
|
|
struct sshbuf *msg;
|
|
int r;
|
|
uint64_t nfiles = 0;
|
|
#if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE)
|
|
struct rlimit rlim;
|
|
#endif
|
|
|
|
debug("request %u: limits", id);
|
|
|
|
#if defined(HAVE_GETRLIMIT) && defined(RLIMIT_NOFILE)
|
|
if (getrlimit(RLIMIT_NOFILE, &rlim) != -1 && rlim.rlim_cur > 5)
|
|
nfiles = rlim.rlim_cur - 5; /* stdio(3) + syslog + spare */
|
|
#endif
|
|
|
|
if ((msg = sshbuf_new()) == NULL)
|
|
fatal_f("sshbuf_new failed");
|
|
if ((r = sshbuf_put_u8(msg, SSH2_FXP_EXTENDED_REPLY)) != 0 ||
|
|
(r = sshbuf_put_u32(msg, id)) != 0 ||
|
|
/* max-packet-length */
|
|
(r = sshbuf_put_u64(msg, SFTP_MAX_MSG_LENGTH)) != 0 ||
|
|
/* max-read-length */
|
|
(r = sshbuf_put_u64(msg, SFTP_MAX_READ_LENGTH)) != 0 ||
|
|
/* max-write-length */
|
|
(r = sshbuf_put_u64(msg, SFTP_MAX_MSG_LENGTH - 1024)) != 0 ||
|
|
/* max-open-handles */
|
|
(r = sshbuf_put_u64(msg, nfiles)) != 0)
|
|
fatal_fr(r, "compose");
|
|
send_msg(msg);
|
|
sshbuf_free(msg);
|
|
}
|
|
|
|
static void
|
|
process_extended_expand(u_int32_t id)
|
|
{
|
|
char cwd[PATH_MAX], resolvedname[PATH_MAX];
|
|
char *path, *npath;
|
|
int r;
|
|
Stat s;
|
|
|
|
if ((r = sshbuf_get_cstring(iqueue, &path, NULL)) != 0)
|
|
fatal_fr(r, "parse");
|
|
if (getcwd(cwd, sizeof(cwd)) == NULL) {
|
|
send_status(id, errno_to_portable(errno));
|
|
goto out;
|
|
}
|
|
|
|
debug3("request %u: expand, original \"%s\"", id, path);
|
|
if (path[0] == '\0') {
|
|
/* empty path */
|
|
free(path);
|
|
path = xstrdup(".");
|
|
} else if (*path == '~') {
|
|
/* ~ expand path */
|
|
/* Special-case for "~" and "~/" to respect homedir flag */
|
|
if (strcmp(path, "~") == 0) {
|
|
free(path);
|
|
path = xstrdup(cwd);
|
|
} else if (strncmp(path, "~/", 2) == 0) {
|
|
npath = xstrdup(path + 2);
|
|
free(path);
|
|
xasprintf(&path, "%s/%s", cwd, npath);
|
|
} else {
|
|
/* ~user expansions */
|
|
if (tilde_expand(path, pw->pw_uid, &npath) != 0) {
|
|
send_status(id, errno_to_portable(EINVAL));
|
|
goto out;
|
|
}
|
|
free(path);
|
|
path = npath;
|
|
}
|
|
} else if (*path != '/') {
|
|
/* relative path */
|
|
xasprintf(&npath, "%s/%s", cwd, path);
|
|
free(path);
|
|
path = npath;
|
|
}
|
|
verbose("expand \"%s\"", path);
|
|
if (sftp_realpath(path, resolvedname) == NULL) {
|
|
send_status(id, errno_to_portable(errno));
|
|
goto out;
|
|
}
|
|
attrib_clear(&s.attrib);
|
|
s.name = s.long_name = resolvedname;
|
|
send_names(id, 1, &s);
|
|
out:
|
|
free(path);
|
|
}
|
|
|
|
static void
|
|
process_extended(u_int32_t id)
|
|
{
|
|
char *request;
|
|
int r;
|
|
const struct sftp_handler *exthand;
|
|
|
|
if ((r = sshbuf_get_cstring(iqueue, &request, NULL)) != 0)
|
|
fatal_fr(r, "parse");
|
|
if ((exthand = extended_handler_byname(request)) == NULL) {
|
|
error("Unknown extended request \"%.100s\"", request);
|
|
send_status(id, SSH2_FX_OP_UNSUPPORTED); /* MUST */
|
|
} else {
|
|
if (!request_permitted(exthand))
|
|
send_status(id, SSH2_FX_PERMISSION_DENIED);
|
|
else
|
|
exthand->handler(id);
|
|
}
|
|
free(request);
|
|
}
|
|
|
|
/* stolen from ssh-agent */
|
|
|
|
static void
|
|
process(void)
|
|
{
|
|
u_int msg_len;
|
|
u_int buf_len;
|
|
u_int consumed;
|
|
u_char type;
|
|
const u_char *cp;
|
|
int i, r;
|
|
u_int32_t id;
|
|
|
|
buf_len = sshbuf_len(iqueue);
|
|
if (buf_len < 5)
|
|
return; /* Incomplete message. */
|
|
cp = sshbuf_ptr(iqueue);
|
|
msg_len = get_u32(cp);
|
|
if (msg_len > SFTP_MAX_MSG_LENGTH) {
|
|
error("bad message from %s local user %s",
|
|
client_addr, pw->pw_name);
|
|
sftp_server_cleanup_exit(11);
|
|
}
|
|
if (buf_len < msg_len + 4)
|
|
return;
|
|
if ((r = sshbuf_consume(iqueue, 4)) != 0)
|
|
fatal_fr(r, "consume");
|
|
buf_len -= 4;
|
|
if ((r = sshbuf_get_u8(iqueue, &type)) != 0)
|
|
fatal_fr(r, "parse type");
|
|
|
|
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");
|
|
if ((r = sshbuf_get_u32(iqueue, &id)) != 0)
|
|
fatal_fr(r, "parse extended ID");
|
|
process_extended(id);
|
|
break;
|
|
default:
|
|
if (!init_done)
|
|
fatal("Received %u request before init", type);
|
|
if ((r = sshbuf_get_u32(iqueue, &id)) != 0)
|
|
fatal_fr(r, "parse ID");
|
|
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 < sshbuf_len(iqueue)) {
|
|
error("iqueue grew unexpectedly");
|
|
sftp_server_cleanup_exit(255);
|
|
}
|
|
consumed = buf_len - sshbuf_len(iqueue);
|
|
if (msg_len < consumed) {
|
|
error("msg_len %u < consumed %u", msg_len, consumed);
|
|
sftp_server_cleanup_exit(255);
|
|
}
|
|
if (msg_len > consumed &&
|
|
(r = sshbuf_consume(iqueue, msg_len - consumed)) != 0)
|
|
fatal_fr(r, "consume");
|
|
}
|
|
|
|
/* Cleanup handler that logs active handles upon normal exit */
|
|
void
|
|
sftp_server_cleanup_exit(int i)
|
|
{
|
|
if (pw != NULL && client_addr != NULL) {
|
|
handle_log_exit();
|
|
logit("session closed for local user %s from [%s]",
|
|
pw->pw_name, client_addr);
|
|
}
|
|
_exit(i);
|
|
}
|
|
|
|
static void
|
|
sftp_server_usage(void)
|
|
{
|
|
extern char *__progname;
|
|
|
|
fprintf(stderr,
|
|
"usage: %s [-ehR] [-d start_directory] [-f log_facility] "
|
|
"[-l log_level]\n\t[-P denied_requests] "
|
|
"[-p allowed_requests] [-u umask]\n"
|
|
" %s -Q protocol_feature\n",
|
|
__progname, __progname);
|
|
exit(1);
|
|
}
|
|
|
|
int
|
|
sftp_server_main(int argc, char **argv, struct passwd *user_pw)
|
|
{
|
|
fd_set *rset, *wset;
|
|
int i, r, in, out, max, ch, skipargs = 0, log_stderr = 0;
|
|
ssize_t len, olen, set_size;
|
|
SyslogFacility log_facility = SYSLOG_FACILITY_AUTH;
|
|
char *cp, *homedir = NULL, uidstr[32], buf[4*4096];
|
|
long mask;
|
|
|
|
extern char *optarg;
|
|
extern char *__progname;
|
|
|
|
__progname = ssh_get_progname(argv[0]);
|
|
log_init(__progname, log_level, log_facility, log_stderr);
|
|
|
|
pw = pwcopy(user_pw);
|
|
|
|
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 'e':
|
|
log_stderr = 1;
|
|
break;
|
|
case 'l':
|
|
log_level = log_level_number(optarg);
|
|
if (log_level == SYSLOG_LEVEL_NOT_SET)
|
|
error("Invalid log level \"%s\"", optarg);
|
|
break;
|
|
case 'f':
|
|
log_facility = log_facility_number(optarg);
|
|
if (log_facility == SYSLOG_FACILITY_NOT_SET)
|
|
error("Invalid log facility \"%s\"", optarg);
|
|
break;
|
|
case 'd':
|
|
cp = tilde_expand_filename(optarg, user_pw->pw_uid);
|
|
snprintf(uidstr, sizeof(uidstr), "%llu",
|
|
(unsigned long long)pw->pw_uid);
|
|
homedir = percent_expand(cp, "d", user_pw->pw_dir,
|
|
"u", user_pw->pw_name, "U", uidstr, (char *)NULL);
|
|
free(cp);
|
|
break;
|
|
case 'p':
|
|
if (request_allowlist != NULL)
|
|
fatal("Permitted requests already set");
|
|
request_allowlist = xstrdup(optarg);
|
|
break;
|
|
case 'P':
|
|
if (request_denylist != NULL)
|
|
fatal("Refused requests already set");
|
|
request_denylist = 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;
|
|
case 'h':
|
|
default:
|
|
sftp_server_usage();
|
|
}
|
|
}
|
|
|
|
log_init(__progname, log_level, log_facility, log_stderr);
|
|
|
|
/*
|
|
* On platforms where we can, 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.
|
|
*/
|
|
platform_disable_tracing(1); /* strict */
|
|
|
|
/* Drop any fine-grained privileges we don't need */
|
|
platform_pledge_sftp_server();
|
|
|
|
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");
|
|
|
|
logit("session opened for local user %s from [%s]",
|
|
pw->pw_name, client_addr);
|
|
|
|
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;
|
|
|
|
if ((iqueue = sshbuf_new()) == NULL)
|
|
fatal_f("sshbuf_new failed");
|
|
if ((oqueue = sshbuf_new()) == NULL)
|
|
fatal_f("sshbuf_new failed");
|
|
|
|
rset = xcalloc(howmany(max + 1, NFDBITS), sizeof(fd_mask));
|
|
wset = xcalloc(howmany(max + 1, NFDBITS), sizeof(fd_mask));
|
|
|
|
if (homedir != NULL) {
|
|
if (chdir(homedir) != 0) {
|
|
error("chdir to \"%s\" failed: %s", homedir,
|
|
strerror(errno));
|
|
}
|
|
}
|
|
|
|
set_size = howmany(max + 1, NFDBITS) * sizeof(fd_mask);
|
|
for (;;) {
|
|
memset(rset, 0, set_size);
|
|
memset(wset, 0, set_size);
|
|
|
|
/*
|
|
* 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 ((r = sshbuf_check_reserve(iqueue, sizeof(buf))) == 0 &&
|
|
(r = sshbuf_check_reserve(oqueue,
|
|
SFTP_MAX_MSG_LENGTH)) == 0)
|
|
FD_SET(in, rset);
|
|
else if (r != SSH_ERR_NO_BUFFER_SPACE)
|
|
fatal_fr(r, "reserve");
|
|
|
|
olen = sshbuf_len(oqueue);
|
|
if (olen > 0)
|
|
FD_SET(out, wset);
|
|
|
|
if (select(max+1, rset, wset, NULL, NULL) == -1) {
|
|
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) {
|
|
debug("read eof");
|
|
sftp_server_cleanup_exit(0);
|
|
} else if (len == -1) {
|
|
error("read: %s", strerror(errno));
|
|
sftp_server_cleanup_exit(1);
|
|
} else if ((r = sshbuf_put(iqueue, buf, len)) != 0)
|
|
fatal_fr(r, "sshbuf_put");
|
|
}
|
|
/* send oqueue to stdout */
|
|
if (FD_ISSET(out, wset)) {
|
|
len = write(out, sshbuf_ptr(oqueue), olen);
|
|
if (len == -1) {
|
|
error("write: %s", strerror(errno));
|
|
sftp_server_cleanup_exit(1);
|
|
} else if ((r = sshbuf_consume(oqueue, len)) != 0)
|
|
fatal_fr(r, "consume");
|
|
}
|
|
|
|
/*
|
|
* Process requests from client if we can fit the results
|
|
* into the output buffer, otherwise stop processing input
|
|
* and let the output queue drain.
|
|
*/
|
|
r = sshbuf_check_reserve(oqueue, SFTP_MAX_MSG_LENGTH);
|
|
if (r == 0)
|
|
process();
|
|
else if (r != SSH_ERR_NO_BUFFER_SPACE)
|
|
fatal_fr(r, "reserve");
|
|
}
|
|
}
|