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openssh-portable/sftp-server.c

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/* $OpenBSD: sftp-server.c,v 1.148 2024/04/30 06:23:51 djm Exp $ */
/*
* Copyright (c) 2000-2004 Markus Friedl. All rights reserved.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "includes.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/resource.h>
#ifdef HAVE_SYS_TIME_H
# include <sys/time.h>
#endif
#ifdef HAVE_SYS_MOUNT_H
#include <sys/mount.h>
#endif
#ifdef HAVE_SYS_STATVFS_H
#include <sys/statvfs.h>
#endif
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#ifdef HAVE_POLL_H
#include <poll.h>
#endif
#include <pwd.h>
#include <grp.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <stdarg.h>
#include "atomicio.h"
#include "xmalloc.h"
#include "sshbuf.h"
#include "ssherr.h"
#include "log.h"
#include "misc.h"
#include "match.h"
#include "uidswap.h"
#include "sftp.h"
#include "sftp-common.h"
char *sftp_realpath(const char *, char *); /* sftp-realpath.c */
/* Maximum data read that we are willing to accept */
#define SFTP_MAX_READ_LENGTH (SFTP_MAX_MSG_LENGTH - 1024)
/* Our verbosity */
static LogLevel log_level = SYSLOG_LEVEL_ERROR;
#ifdef WINDOWS
static SyslogFacility log_facility_g = SYSLOG_FACILITY_AUTH;
int log_stderr_g = 0;
#endif
/* Our client */
static struct passwd *pw = NULL;
static char *client_addr = NULL;
/* input and output queue */
struct sshbuf *iqueue;
struct sshbuf *oqueue;
/* Version of client */
static u_int version;
/* SSH2_FXP_INIT received */
static int init_done;
/* Disable writes */
static int readonly;
/* Requests that are allowed/denied */
static char *request_allowlist, *request_denylist;
/* portable attributes, etc. */
typedef struct Stat Stat;
struct Stat {
char *name;
char *long_name;
Attrib attrib;
};
/* Packet handlers */
static void process_open(u_int32_t id);
static void process_close(u_int32_t id);
static void process_read(u_int32_t id);
static void process_write(u_int32_t id);
static void process_stat(u_int32_t id);
static void process_lstat(u_int32_t id);
static void process_fstat(u_int32_t id);
static void process_setstat(u_int32_t id);
static void process_fsetstat(u_int32_t id);
static void process_opendir(u_int32_t id);
static void process_readdir(u_int32_t id);
static void process_remove(u_int32_t id);
static void process_mkdir(u_int32_t id);
static void process_rmdir(u_int32_t id);
static void process_realpath(u_int32_t id);
static void process_rename(u_int32_t id);
static void process_readlink(u_int32_t id);
static void process_symlink(u_int32_t id);
static void process_extended_posix_rename(u_int32_t id);
static void process_extended_statvfs(u_int32_t id);
static void process_extended_fstatvfs(u_int32_t id);
static void process_extended_hardlink(u_int32_t id);
static void process_extended_fsync(u_int32_t id);
static void process_extended_lsetstat(u_int32_t id);
static void process_extended_limits(u_int32_t id);
static void process_extended_expand(u_int32_t id);
static void process_extended_copy_data(u_int32_t id);
static void process_extended_home_directory(u_int32_t id);
static void process_extended_get_users_groups_by_id(u_int32_t id);
static void process_extended(u_int32_t id);
struct sftp_handler {
const char *name; /* user-visible name for fine-grained perms */
const char *ext_name; /* extended request name */
u_int type; /* packet type, for non extended packets */
void (*handler)(u_int32_t);
int does_write; /* if nonzero, banned for readonly mode */
};
static const struct sftp_handler handlers[] = {
/* NB. SSH2_FXP_OPEN does the readonly check in the handler itself */
{ "open", NULL, SSH2_FXP_OPEN, process_open, 0 },
{ "close", NULL, SSH2_FXP_CLOSE, process_close, 0 },
{ "read", NULL, SSH2_FXP_READ, process_read, 0 },
{ "write", NULL, SSH2_FXP_WRITE, process_write, 1 },
{ "lstat", NULL, SSH2_FXP_LSTAT, process_lstat, 0 },
{ "fstat", NULL, SSH2_FXP_FSTAT, process_fstat, 0 },
{ "setstat", NULL, SSH2_FXP_SETSTAT, process_setstat, 1 },
{ "fsetstat", NULL, SSH2_FXP_FSETSTAT, process_fsetstat, 1 },
{ "opendir", NULL, SSH2_FXP_OPENDIR, process_opendir, 0 },
{ "readdir", NULL, SSH2_FXP_READDIR, process_readdir, 0 },
{ "remove", NULL, SSH2_FXP_REMOVE, process_remove, 1 },
{ "mkdir", NULL, SSH2_FXP_MKDIR, process_mkdir, 1 },
{ "rmdir", NULL, SSH2_FXP_RMDIR, process_rmdir, 1 },
{ "realpath", NULL, SSH2_FXP_REALPATH, process_realpath, 0 },
{ "stat", NULL, SSH2_FXP_STAT, process_stat, 0 },
{ "rename", NULL, SSH2_FXP_RENAME, process_rename, 1 },
{ "readlink", NULL, SSH2_FXP_READLINK, process_readlink, 0 },
{ "symlink", NULL, SSH2_FXP_SYMLINK, process_symlink, 1 },
{ NULL, NULL, 0, NULL, 0 }
};
/* SSH2_FXP_EXTENDED submessages */
static const struct sftp_handler extended_handlers[] = {
{ "posix-rename", "posix-rename@openssh.com", 0,
process_extended_posix_rename, 1 },
{ "statvfs", "statvfs@openssh.com", 0, process_extended_statvfs, 0 },
#ifndef WINDOWS
{ "fstatvfs", "fstatvfs@openssh.com", 0, process_extended_fstatvfs, 0 },
#endif
{ "hardlink", "hardlink@openssh.com", 0, process_extended_hardlink, 1 },
{ "fsync", "fsync@openssh.com", 0, process_extended_fsync, 1 },
{ "lsetstat", "lsetstat@openssh.com", 0, process_extended_lsetstat, 1 },
{ "limits", "limits@openssh.com", 0, process_extended_limits, 0 },
{ "expand-path", "expand-path@openssh.com", 0,
process_extended_expand, 0 },
{ "copy-data", "copy-data", 0, process_extended_copy_data, 1 },
{ "home-directory", "home-directory", 0,
process_extended_home_directory, 0 },
#ifndef WINDOWS
{ "users-groups-by-id", "users-groups-by-id@openssh.com", 0,
process_extended_get_users_groups_by_id, 0 },
#endif
{ NULL, NULL, 0, NULL, 0 }
};
static const struct sftp_handler *
extended_handler_byname(const char *name)
{
int i;
for (i = 0; extended_handlers[i].handler != NULL; i++) {
if (strcmp(name, extended_handlers[i].ext_name) == 0)
return &extended_handlers[i];
}
return NULL;
}
static int
request_permitted(const struct sftp_handler *h)
{
char *result;
if (readonly && h->does_write) {
verbose("Refusing %s request in read-only mode", h->name);
return 0;
}
if (request_denylist != NULL &&
((result = match_list(h->name, request_denylist, NULL))) != NULL) {
free(result);
verbose("Refusing denylisted %s request", h->name);
return 0;
}
if (request_allowlist != NULL &&
((result = match_list(h->name, request_allowlist, NULL))) != NULL) {
free(result);
debug2("Permitting allowlisted %s request", h->name);
return 1;
}
if (request_allowlist != NULL) {
verbose("Refusing non-allowlisted %s request", h->name);
return 0;
}
return 1;
}
static int
errno_to_portable(int unixerrno)
{
int ret = 0;
switch (unixerrno) {
case 0:
ret = SSH2_FX_OK;
break;
case ENOENT:
case ENOTDIR:
case EBADF:
case ELOOP:
ret = SSH2_FX_NO_SUCH_FILE;
break;
case EPERM:
case EACCES:
case EFAULT:
ret = SSH2_FX_PERMISSION_DENIED;
break;
case ENAMETOOLONG:
case EINVAL:
ret = SSH2_FX_BAD_MESSAGE;
break;
case ENOSYS:
ret = SSH2_FX_OP_UNSUPPORTED;
break;
default:
ret = SSH2_FX_FAILURE;
break;
}
return ret;
}
static int
flags_from_portable(int pflags)
{
int flags = 0;
if ((pflags & SSH2_FXF_READ) &&
(pflags & SSH2_FXF_WRITE)) {
flags = O_RDWR;
} else if (pflags & SSH2_FXF_READ) {
flags = O_RDONLY;
} else if (pflags & SSH2_FXF_WRITE) {
flags = O_WRONLY;
}
if (pflags & SSH2_FXF_APPEND)
flags |= O_APPEND;
if (pflags & SSH2_FXF_CREAT)
flags |= O_CREAT;
if (pflags & SSH2_FXF_TRUNC)
flags |= O_TRUNC;
if (pflags & SSH2_FXF_EXCL)
flags |= O_EXCL;
return flags;
}
static const char *
string_from_portable(int pflags)
{
static char ret[128];
*ret = '\0';
#define PAPPEND(str) { \
if (*ret != '\0') \
strlcat(ret, ",", sizeof(ret)); \
strlcat(ret, str, sizeof(ret)); \
}
if (pflags & SSH2_FXF_READ)
PAPPEND("READ")
if (pflags & SSH2_FXF_WRITE)
PAPPEND("WRITE")
if (pflags & SSH2_FXF_APPEND)
PAPPEND("APPEND")
if (pflags & SSH2_FXF_CREAT)
PAPPEND("CREATE")
if (pflags & SSH2_FXF_TRUNC)
PAPPEND("TRUNCATE")
if (pflags & SSH2_FXF_EXCL)
PAPPEND("EXCL")
return ret;
}
/* handle handles */
typedef struct Handle Handle;
struct Handle {
int use;
DIR *dirp;
int fd;
int flags;
char *name;
u_int64_t bytes_read, bytes_write;
int next_unused;
};
enum {
HANDLE_UNUSED,
HANDLE_DIR,
HANDLE_FILE
};
static Handle *handles = NULL;
static u_int num_handles = 0;
static int first_unused_handle = -1;
static void handle_unused(int i)
{
handles[i].use = HANDLE_UNUSED;
handles[i].next_unused = first_unused_handle;
first_unused_handle = i;
}
static int
handle_new(int use, const char *name, int fd, int flags, DIR *dirp)
{
int i;
if (first_unused_handle == -1) {
if (num_handles + 1 <= num_handles)
return -1;
num_handles++;
handles = xreallocarray(handles, num_handles, sizeof(Handle));
handle_unused(num_handles - 1);
}
i = first_unused_handle;
first_unused_handle = handles[i].next_unused;
handles[i].use = use;
handles[i].dirp = dirp;
handles[i].fd = fd;
handles[i].flags = flags;
handles[i].name = xstrdup(name);
handles[i].bytes_read = handles[i].bytes_write = 0;
return i;
}
static int
handle_is_ok(int i, int type)
{
return i >= 0 && (u_int)i < num_handles && handles[i].use == type;
}
static int
handle_to_string(int handle, u_char **stringp, int *hlenp)
{
if (stringp == NULL || hlenp == NULL)
return -1;
*stringp = xmalloc(sizeof(int32_t));
put_u32(*stringp, handle);
*hlenp = sizeof(int32_t);
return 0;
}
static int
handle_from_string(const u_char *handle, u_int hlen)
{
int val;
if (hlen != sizeof(int32_t))
return -1;
val = get_u32(handle);
if (handle_is_ok(val, HANDLE_FILE) ||
handle_is_ok(val, HANDLE_DIR))
return val;
return -1;
}
static char *
handle_to_name(int handle)
{
if (handle_is_ok(handle, HANDLE_DIR)||
handle_is_ok(handle, HANDLE_FILE))
return handles[handle].name;
return NULL;
}
static DIR *
handle_to_dir(int handle)
{
if (handle_is_ok(handle, HANDLE_DIR))
return handles[handle].dirp;
return NULL;
}
static int
handle_to_fd(int handle)
{
if (handle_is_ok(handle, HANDLE_FILE))
return handles[handle].fd;
return -1;
}
static int
handle_to_flags(int handle)
{
if (handle_is_ok(handle, HANDLE_FILE))
return handles[handle].flags;
return 0;
}
static void
handle_update_read(int handle, ssize_t bytes)
{
if (handle_is_ok(handle, HANDLE_FILE) && bytes > 0)
handles[handle].bytes_read += bytes;
}
static void
handle_update_write(int handle, ssize_t bytes)
{
if (handle_is_ok(handle, HANDLE_FILE) && bytes > 0)
handles[handle].bytes_write += bytes;
}
static u_int64_t
handle_bytes_read(int handle)
{
if (handle_is_ok(handle, HANDLE_FILE))
return (handles[handle].bytes_read);
return 0;
}
static u_int64_t
handle_bytes_write(int handle)
{
if (handle_is_ok(handle, HANDLE_FILE))
return (handles[handle].bytes_write);
return 0;
}
static int
handle_close(int handle)
{
int ret = -1;
if (handle_is_ok(handle, HANDLE_FILE)) {
ret = close(handles[handle].fd);
free(handles[handle].name);
handle_unused(handle);
} else if (handle_is_ok(handle, HANDLE_DIR)) {
ret = closedir(handles[handle].dirp);
free(handles[handle].name);
handle_unused(handle);
} else {
errno = ENOENT;
}
return ret;
}
static void
handle_log_close(int handle, char *emsg)
{
if (handle_is_ok(handle, HANDLE_FILE)) {
logit("%s%sclose \"%s\" bytes read %llu written %llu",
emsg == NULL ? "" : emsg, emsg == NULL ? "" : " ",
handle_to_name(handle),
(unsigned long long)handle_bytes_read(handle),
(unsigned long long)handle_bytes_write(handle));
} else {
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)
handle_log_close(i, "forced");
}
static int
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)
{
static const char * const 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_errmsg(u_int32_t id, u_int32_t status, const char *errmsg)
{
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, errmsg == NULL ?
status_to_message(status) : errmsg)) != 0 ||
(r = sshbuf_put_cstring(msg, "")) != 0)
fatal_fr(r, "compose message");
}
send_msg(msg);
sshbuf_free(msg);
}
static void
send_status(u_int32_t id, u_int32_t status)
{
send_status_errmsg(id, status, NULL);
}
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 = NULL;
int hlen;
handle_to_string(handle, &string, &hlen);
debug("request %u: sent 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 advertisement.
*/
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 advertisements */
compose_extension(msg, "posix-rename@openssh.com", "1");
compose_extension(msg, "statvfs@openssh.com", "2");
#ifndef WINDOWS
compose_extension(msg, "fstatvfs@openssh.com", "2");
#endif
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");
compose_extension(msg, "copy-data", "1");
compose_extension(msg, "home-directory", "1");
#ifndef WINDOWS
compose_extension(msg, "users-groups-by-id@openssh.com", "1");
#endif
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 {
#ifdef WINDOWS
// In windows, we would like to inherit the parent folder permissions by setting mode to USHRT_MAX.
fd = open(name, flags, USHRT_MAX);
#else
fd = open(name, flags, mode);
#endif // WINDOWS
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(buf, 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); // CodeQL [SM02311]: false positive name will not be null because of handle_to_fd check
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); // CodeQL [SM02311]: false positive name will not be null because of handle_to_fd check
#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); // CodeQL [SM02311]: false positive name will not be null because of handle_to_fd check
#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, // CodeQL [SM02311]: false positive name will not be null because of handle_to_fd check
(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, NULL, NULL);
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);
#ifdef WINDOWS
if (realpath(path, resolvedname) == NULL) {
#else
if (sftp_realpath(path, resolvedname) == NULL) {
#endif // WINDOWS
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);
free(npath);
} else {
/* ~user expansions */
if (tilde_expand(path, pw->pw_uid, &npath) != 0) {
send_status_errmsg(id,
errno_to_portable(ENOENT), "no such user");
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);
#ifdef WINDOWS
if (realpath(path, resolvedname) == NULL) {
#else
if (sftp_realpath(path, resolvedname) == NULL) {
#endif
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_copy_data(u_int32_t id)
{
u_char buf[64*1024];
int read_handle, read_fd, write_handle, write_fd;
u_int64_t len, read_off, read_len, write_off;
int r, copy_until_eof, status = SSH2_FX_OP_UNSUPPORTED;
size_t ret;
if ((r = get_handle(iqueue, &read_handle)) != 0 ||
(r = sshbuf_get_u64(iqueue, &read_off)) != 0 ||
(r = sshbuf_get_u64(iqueue, &read_len)) != 0 ||
(r = get_handle(iqueue, &write_handle)) != 0 ||
(r = sshbuf_get_u64(iqueue, &write_off)) != 0)
fatal("%s: buffer error: %s", __func__, ssh_err(r));
debug("request %u: copy-data from \"%s\" (handle %d) off %llu len %llu "
"to \"%s\" (handle %d) off %llu",
id, handle_to_name(read_handle), read_handle,
(unsigned long long)read_off, (unsigned long long)read_len,
handle_to_name(write_handle), write_handle,
(unsigned long long)write_off);
/* For read length of 0, we read until EOF. */
if (read_len == 0) {
read_len = (u_int64_t)-1 - read_off;
copy_until_eof = 1;
} else
copy_until_eof = 0;
read_fd = handle_to_fd(read_handle);
write_fd = handle_to_fd(write_handle);
/* Disallow reading & writing to the same handle or same path or dirs */
if (read_handle == write_handle || read_fd < 0 || write_fd < 0 ||
!strcmp(handle_to_name(read_handle), handle_to_name(write_handle))) {
status = SSH2_FX_FAILURE;
goto out;
}
if (lseek(read_fd, read_off, SEEK_SET) < 0) {
status = errno_to_portable(errno);
error("%s: read_seek failed", __func__);
goto out;
}
if ((handle_to_flags(write_handle) & O_APPEND) == 0 &&
lseek(write_fd, write_off, SEEK_SET) < 0) {
status = errno_to_portable(errno);
error("%s: write_seek failed", __func__);
goto out;
}
/* Process the request in chunks. */
while (read_len > 0 || copy_until_eof) {
len = MINIMUM(sizeof(buf), read_len);
read_len -= len;
ret = atomicio(read, read_fd, buf, len);
if (ret == 0 && errno == EPIPE) {
status = copy_until_eof ? SSH2_FX_OK : SSH2_FX_EOF;
break;
} else if (ret == 0) {
status = errno_to_portable(errno);
error("%s: read failed: %s", __func__, strerror(errno));
break;
}
len = ret;
handle_update_read(read_handle, len);
ret = atomicio(vwrite, write_fd, buf, len);
if (ret != len) {
status = errno_to_portable(errno);
error("%s: write failed: %llu != %llu: %s", __func__,
(unsigned long long)ret, (unsigned long long)len,
strerror(errno));
break;
}
handle_update_write(write_handle, len);
}
if (read_len == 0)
status = SSH2_FX_OK;
out:
send_status(id, status);
}
static void
process_extended_home_directory(u_int32_t id)
{
char *username;
struct passwd *user_pw;
int r;
Stat s;
if ((r = sshbuf_get_cstring(iqueue, &username, NULL)) != 0)
fatal_fr(r, "parse");
debug3("request %u: home-directory \"%s\"", id, username);
if (username[0] == '\0') {
user_pw = pw;
} else if ((user_pw = getpwnam(username)) == NULL) {
send_status(id, SSH2_FX_FAILURE);
goto out;
}
verbose("home-directory \"%s\"", user_pw->pw_dir);
attrib_clear(&s.attrib);
s.name = s.long_name = user_pw->pw_dir;
send_names(id, 1, &s);
out:
free(username);
}
static void
process_extended_get_users_groups_by_id(u_int32_t id)
{
#ifndef WINDOWS
struct passwd *user_pw;
struct group *gr;
struct sshbuf *uids, *gids, *usernames, *groupnames, *msg;
int r;
u_int n, nusers = 0, ngroups = 0;
const char *name;
if ((usernames = sshbuf_new()) == NULL ||
(groupnames = sshbuf_new()) == NULL ||
(msg = sshbuf_new()) == NULL)
fatal_f("sshbuf_new failed");
if ((r = sshbuf_froms(iqueue, &uids)) != 0 ||
(r = sshbuf_froms(iqueue, &gids)) != 0)
fatal_fr(r, "parse");
debug_f("uids len = %zu, gids len = %zu",
sshbuf_len(uids), sshbuf_len(gids));
while (sshbuf_len(uids) != 0) {
if ((r = sshbuf_get_u32(uids, &n)) != 0)
fatal_fr(r, "parse inner uid");
user_pw = getpwuid((uid_t)n);
name = user_pw == NULL ? "" : user_pw->pw_name;
debug3_f("uid %u => \"%s\"", n, name);
if ((r = sshbuf_put_cstring(usernames, name)) != 0)
fatal_fr(r, "assemble uid reply");
nusers++;
}
while (sshbuf_len(gids) != 0) {
if ((r = sshbuf_get_u32(gids, &n)) != 0)
fatal_fr(r, "parse inner gid");
gr = getgrgid((gid_t)n);
name = gr == NULL ? "" : gr->gr_name;
debug3_f("gid %u => \"%s\"", n, name);
if ((r = sshbuf_put_cstring(groupnames, name)) != 0)
fatal_fr(r, "assemble gid reply");
nusers++;
}
verbose("users-groups-by-id: %u users, %u groups", nusers, ngroups);
if ((r = sshbuf_put_u8(msg, SSH2_FXP_EXTENDED_REPLY)) != 0 ||
(r = sshbuf_put_u32(msg, id)) != 0 ||
(r = sshbuf_put_stringb(msg, usernames)) != 0 ||
(r = sshbuf_put_stringb(msg, groupnames)) != 0)
fatal_fr(r, "compose");
send_msg(msg);
sshbuf_free(uids);
sshbuf_free(gids);
sshbuf_free(usernames);
sshbuf_free(groupnames);
sshbuf_free(msg);
#endif
}
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);
}
#ifdef WINDOWS
void
log_handler(LogLevel level, int forced, const char* msg, void* ctx)
{
#include "atomicio.h"
struct sshbuf* log_msg;
int* log_fd = (int*)ctx;
int r;
size_t len;
if (*log_fd == -1)
fatal_f("no log channel");
if ((log_msg = sshbuf_new()) == NULL)
fatal_f("sshbuf_new failed");
if ((r = sshbuf_put_u32(log_msg, 0)) != 0 || /* length; filled below */
(r = sshbuf_put_u32(log_msg, level)) != 0 ||
(r = sshbuf_put_u32(log_msg, forced)) != 0 ||
(r = sshbuf_put_cstring(log_msg, msg)) != 0 ||
(r = sshbuf_put_cstring(log_msg, __progname)) != 0 ||
(r = sshbuf_put_u32(log_msg, log_level)) != 0 ||
(r = sshbuf_put_u32(log_msg, log_facility_g)) != 0 ||
(r = sshbuf_put_u32(log_msg, log_stderr_g)) != 0)
fatal_fr(r, "assemble");
if ((len = sshbuf_len(log_msg)) < 4 || len > 0xffffffff)
fatal_f("bad length %zu", len);
POKE_U32(sshbuf_mutable_ptr(log_msg), len - 4);
if (atomicio(vwrite, *log_fd,
sshbuf_mutable_ptr(log_msg), len) != len)
fatal_f("write: %s", strerror(errno));
sshbuf_free(log_msg);
}
#endif
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)
{
int i, r, in, out, ch, skipargs = 0, log_stderr = 0;
ssize_t len, olen;
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);
#ifdef WINDOWS
/*
* SFTP-Server fowards log messages to SSHD System process.
* SSHD system process logs the messages to either ETW or sftp-server.log.
* This allows us to log the messages of both non-admin and admin users.
*/
int log_send_fd = SFTP_SERVER_LOG_FD;
log_facility_g = log_facility;
log_stderr_g = log_stderr;
if (fcntl(log_send_fd, F_SETFD, FD_CLOEXEC) != -1)
set_log_handler(log_handler, (void*)&log_send_fd);
#endif
/*
* 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
if ((iqueue = sshbuf_new()) == NULL)
fatal_f("sshbuf_new failed");
if ((oqueue = sshbuf_new()) == NULL)
fatal_f("sshbuf_new failed");
if (homedir != NULL) {
if (chdir(homedir) != 0) {
error("chdir to \"%s\" failed: %s", homedir,
strerror(errno));
}
}
for (;;) {
struct pollfd pfd[2];
memset(pfd, 0, sizeof pfd);
pfd[0].fd = pfd[1].fd = -1;
/*
* 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) {
pfd[0].fd = in;
pfd[0].events = POLLIN;
}
else if (r != SSH_ERR_NO_BUFFER_SPACE)
fatal_fr(r, "reserve");
olen = sshbuf_len(oqueue);
if (olen > 0) {
pfd[1].fd = out;
pfd[1].events = POLLOUT;
}
if (poll(pfd, 2, -1) == -1) {
if (errno == EINTR)
continue;
error("poll: %s", strerror(errno));
sftp_server_cleanup_exit(2);
}
/* copy stdin to iqueue */
if (pfd[0].revents & (POLLIN|POLLHUP)) {
len = read(in, buf, sizeof buf);
if (len == 0) {
debug("read eof");
sftp_server_cleanup_exit(0);
} else if (len == -1) {
if (errno != EAGAIN && errno != EINTR) {
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 (pfd[1].revents & (POLLOUT|POLLHUP)) {
len = write(out, sshbuf_ptr(oqueue), olen);
if (len == 0 || (len == -1 && errno == EPIPE)) {
debug("write eof");
sftp_server_cleanup_exit(0);
} else if (len == -1) {
sftp_server_cleanup_exit(1);
if (errno != EAGAIN && errno != EINTR) {
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");
}
}
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