NetBSD/crypto/dist/ssh/sftp-client.c

801 lines
18 KiB
C

/*
* Copyright (c) 2001 Damien Miller. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/* XXX: memleaks */
/* XXX: signed vs unsigned */
/* XXX: redesign to allow concurrent overlapped operations */
/* XXX: we use fatal too much, error may be more appropriate in places */
/* XXX: copy between two remote sites */
#include "includes.h"
RCSID("$OpenBSD: sftp-client.c,v 1.10 2001/02/14 09:46:03 djm Exp $");
#include "ssh.h"
#include "buffer.h"
#include "bufaux.h"
#include "getput.h"
#include "xmalloc.h"
#include "log.h"
#include "atomicio.h"
#include "pathnames.h"
#include "sftp.h"
#include "sftp-common.h"
#include "sftp-client.h"
/* How much data to read/write at at time during copies */
/* XXX: what should this be? */
#define COPY_SIZE 8192
/* Message ID */
static u_int msg_id = 1;
static void
send_msg(int fd, Buffer *m)
{
int mlen = buffer_len(m);
int len;
Buffer oqueue;
buffer_init(&oqueue);
buffer_put_int(&oqueue, mlen);
buffer_append(&oqueue, buffer_ptr(m), mlen);
buffer_consume(m, mlen);
len = atomic_write(fd, buffer_ptr(&oqueue), buffer_len(&oqueue));
if (len <= 0)
fatal("Couldn't send packet: %s", strerror(errno));
buffer_free(&oqueue);
}
static void
get_msg(int fd, Buffer *m)
{
u_int len, msg_len;
unsigned char buf[4096];
len = atomic_read(fd, buf, 4);
if (len != 4)
fatal("Couldn't read packet: %s", strerror(errno));
msg_len = GET_32BIT(buf);
if (msg_len > 256 * 1024)
fatal("Received message too long %d", msg_len);
while (msg_len) {
len = atomic_read(fd, buf, MIN(msg_len, sizeof(buf)));
if (len <= 0)
fatal("Couldn't read packet: %s", strerror(errno));
msg_len -= len;
buffer_append(m, buf, len);
}
}
static void
send_string_request(int fd, u_int id, u_int code, char *s,
u_int len)
{
Buffer msg;
buffer_init(&msg);
buffer_put_char(&msg, code);
buffer_put_int(&msg, id);
buffer_put_string(&msg, s, len);
send_msg(fd, &msg);
debug3("Sent message fd %d T:%d I:%d", fd, code, id);
buffer_free(&msg);
}
static void
send_string_attrs_request(int fd, u_int id, u_int code, char *s,
u_int len, Attrib *a)
{
Buffer msg;
buffer_init(&msg);
buffer_put_char(&msg, code);
buffer_put_int(&msg, id);
buffer_put_string(&msg, s, len);
encode_attrib(&msg, a);
send_msg(fd, &msg);
debug3("Sent message fd %d T:%d I:%d", fd, code, id);
buffer_free(&msg);
}
static u_int
get_status(int fd, int expected_id)
{
Buffer msg;
u_int type, id, status;
buffer_init(&msg);
get_msg(fd, &msg);
type = buffer_get_char(&msg);
id = buffer_get_int(&msg);
if (id != expected_id)
fatal("ID mismatch (%d != %d)", id, expected_id);
if (type != SSH2_FXP_STATUS)
fatal("Expected SSH2_FXP_STATUS(%d) packet, got %d",
SSH2_FXP_STATUS, type);
status = buffer_get_int(&msg);
buffer_free(&msg);
debug3("SSH2_FXP_STATUS %d", status);
return(status);
}
static char *
get_handle(int fd, u_int expected_id, u_int *len)
{
Buffer msg;
u_int type, id;
char *handle;
buffer_init(&msg);
get_msg(fd, &msg);
type = buffer_get_char(&msg);
id = buffer_get_int(&msg);
if (id != expected_id)
fatal("ID mismatch (%d != %d)", id, expected_id);
if (type == SSH2_FXP_STATUS) {
int status = buffer_get_int(&msg);
error("Couldn't get handle: %s", fx2txt(status));
return(NULL);
} else if (type != SSH2_FXP_HANDLE)
fatal("Expected SSH2_FXP_HANDLE(%d) packet, got %d",
SSH2_FXP_HANDLE, type);
handle = buffer_get_string(&msg, len);
buffer_free(&msg);
return(handle);
}
static Attrib *
get_decode_stat(int fd, u_int expected_id)
{
Buffer msg;
u_int type, id;
Attrib *a;
buffer_init(&msg);
get_msg(fd, &msg);
type = buffer_get_char(&msg);
id = buffer_get_int(&msg);
debug3("Received stat reply T:%d I:%d", type, id);
if (id != expected_id)
fatal("ID mismatch (%d != %d)", id, expected_id);
if (type == SSH2_FXP_STATUS) {
int status = buffer_get_int(&msg);
error("Couldn't stat remote file: %s", fx2txt(status));
return(NULL);
} else if (type != SSH2_FXP_ATTRS) {
fatal("Expected SSH2_FXP_ATTRS(%d) packet, got %d",
SSH2_FXP_ATTRS, type);
}
a = decode_attrib(&msg);
buffer_free(&msg);
return(a);
}
int
do_init(int fd_in, int fd_out)
{
int type, version;
Buffer msg;
buffer_init(&msg);
buffer_put_char(&msg, SSH2_FXP_INIT);
buffer_put_int(&msg, SSH2_FILEXFER_VERSION);
send_msg(fd_out, &msg);
buffer_clear(&msg);
get_msg(fd_in, &msg);
/* Expecting a VERSION reply */
if ((type = buffer_get_char(&msg)) != SSH2_FXP_VERSION) {
error("Invalid packet back from SSH2_FXP_INIT (type %d)",
type);
buffer_free(&msg);
return(-1);
}
version = buffer_get_int(&msg);
debug2("Remote version: %d", version);
/* Check for extensions */
while (buffer_len(&msg) > 0) {
char *name = buffer_get_string(&msg, NULL);
char *value = buffer_get_string(&msg, NULL);
debug2("Init extension: \"%s\"", name);
xfree(name);
xfree(value);
}
buffer_free(&msg);
return(0);
}
int
do_close(int fd_in, int fd_out, char *handle, u_int handle_len)
{
u_int id, status;
Buffer msg;
buffer_init(&msg);
id = msg_id++;
buffer_put_char(&msg, SSH2_FXP_CLOSE);
buffer_put_int(&msg, id);
buffer_put_string(&msg, handle, handle_len);
send_msg(fd_out, &msg);
debug3("Sent message SSH2_FXP_CLOSE I:%d", id);
status = get_status(fd_in, id);
if (status != SSH2_FX_OK)
error("Couldn't close file: %s", fx2txt(status));
buffer_free(&msg);
return(status);
}
int
do_ls(int fd_in, int fd_out, char *path)
{
Buffer msg;
u_int type, id, handle_len, i, expected_id;
char *handle;
id = msg_id++;
buffer_init(&msg);
buffer_put_char(&msg, SSH2_FXP_OPENDIR);
buffer_put_int(&msg, id);
buffer_put_cstring(&msg, path);
send_msg(fd_out, &msg);
buffer_clear(&msg);
handle = get_handle(fd_in, id, &handle_len);
if (handle == NULL)
return(-1);
for(;;) {
int count;
id = expected_id = msg_id++;
debug3("Sending SSH2_FXP_READDIR I:%d", id);
buffer_clear(&msg);
buffer_put_char(&msg, SSH2_FXP_READDIR);
buffer_put_int(&msg, id);
buffer_put_string(&msg, handle, handle_len);
send_msg(fd_out, &msg);
buffer_clear(&msg);
get_msg(fd_in, &msg);
type = buffer_get_char(&msg);
id = buffer_get_int(&msg);
debug3("Received reply T:%d I:%d", type, id);
if (id != expected_id)
fatal("ID mismatch (%d != %d)", id, expected_id);
if (type == SSH2_FXP_STATUS) {
int status = buffer_get_int(&msg);
debug3("Received SSH2_FXP_STATUS %d", status);
if (status == SSH2_FX_EOF) {
break;
} else {
error("Couldn't read directory: %s",
fx2txt(status));
do_close(fd_in, fd_out, handle, handle_len);
return(status);
}
} else if (type != SSH2_FXP_NAME)
fatal("Expected SSH2_FXP_NAME(%d) packet, got %d",
SSH2_FXP_NAME, type);
count = buffer_get_int(&msg);
if (count == 0)
break;
debug3("Received %d SSH2_FXP_NAME responses", count);
for(i = 0; i < count; i++) {
char *filename, *longname;
Attrib *a;
filename = buffer_get_string(&msg, NULL);
longname = buffer_get_string(&msg, NULL);
a = decode_attrib(&msg);
printf("%s\n", longname);
xfree(filename);
xfree(longname);
}
}
buffer_free(&msg);
do_close(fd_in, fd_out, handle, handle_len);
xfree(handle);
return(0);
}
int
do_rm(int fd_in, int fd_out, char *path)
{
u_int status, id;
debug2("Sending SSH2_FXP_REMOVE \"%s\"", path);
id = msg_id++;
send_string_request(fd_out, id, SSH2_FXP_REMOVE, path, strlen(path));
status = get_status(fd_in, id);
if (status != SSH2_FX_OK)
error("Couldn't delete file: %s", fx2txt(status));
return(status);
}
int
do_mkdir(int fd_in, int fd_out, char *path, Attrib *a)
{
u_int status, id;
id = msg_id++;
send_string_attrs_request(fd_out, id, SSH2_FXP_MKDIR, path,
strlen(path), a);
status = get_status(fd_in, id);
if (status != SSH2_FX_OK)
error("Couldn't create directory: %s", fx2txt(status));
return(status);
}
int
do_rmdir(int fd_in, int fd_out, char *path)
{
u_int status, id;
id = msg_id++;
send_string_request(fd_out, id, SSH2_FXP_RMDIR, path, strlen(path));
status = get_status(fd_in, id);
if (status != SSH2_FX_OK)
error("Couldn't remove directory: %s", fx2txt(status));
return(status);
}
Attrib *
do_stat(int fd_in, int fd_out, char *path)
{
u_int id;
id = msg_id++;
send_string_request(fd_out, id, SSH2_FXP_STAT, path, strlen(path));
return(get_decode_stat(fd_in, id));
}
Attrib *
do_lstat(int fd_in, int fd_out, char *path)
{
u_int id;
id = msg_id++;
send_string_request(fd_out, id, SSH2_FXP_LSTAT, path, strlen(path));
return(get_decode_stat(fd_in, id));
}
Attrib *
do_fstat(int fd_in, int fd_out, char *handle,
u_int handle_len)
{
u_int id;
id = msg_id++;
send_string_request(fd_out, id, SSH2_FXP_FSTAT, handle, handle_len);
return(get_decode_stat(fd_in, id));
}
int
do_setstat(int fd_in, int fd_out, char *path, Attrib *a)
{
u_int status, id;
id = msg_id++;
send_string_attrs_request(fd_out, id, SSH2_FXP_SETSTAT, path,
strlen(path), a);
status = get_status(fd_in, id);
if (status != SSH2_FX_OK)
error("Couldn't setstat on \"%s\": %s", path,
fx2txt(status));
return(status);
}
int
do_fsetstat(int fd_in, int fd_out, char *handle, u_int handle_len,
Attrib *a)
{
u_int status, id;
id = msg_id++;
send_string_attrs_request(fd_out, id, SSH2_FXP_FSETSTAT, handle,
handle_len, a);
status = get_status(fd_in, id);
if (status != SSH2_FX_OK)
error("Couldn't fsetstat: %s", fx2txt(status));
return(status);
}
char *
do_realpath(int fd_in, int fd_out, char *path)
{
Buffer msg;
u_int type, expected_id, count, id;
char *filename, *longname;
Attrib *a;
expected_id = id = msg_id++;
send_string_request(fd_out, id, SSH2_FXP_REALPATH, path,
strlen(path));
buffer_init(&msg);
get_msg(fd_in, &msg);
type = buffer_get_char(&msg);
id = buffer_get_int(&msg);
if (id != expected_id)
fatal("ID mismatch (%d != %d)", id, expected_id);
if (type == SSH2_FXP_STATUS) {
u_int status = buffer_get_int(&msg);
error("Couldn't canonicalise: %s", fx2txt(status));
return(NULL);
} else if (type != SSH2_FXP_NAME)
fatal("Expected SSH2_FXP_NAME(%d) packet, got %d",
SSH2_FXP_NAME, type);
count = buffer_get_int(&msg);
if (count != 1)
fatal("Got multiple names (%d) from SSH_FXP_REALPATH", count);
filename = buffer_get_string(&msg, NULL);
longname = buffer_get_string(&msg, NULL);
a = decode_attrib(&msg);
debug3("SSH_FXP_REALPATH %s -> %s", path, filename);
xfree(longname);
buffer_free(&msg);
return(filename);
}
int
do_rename(int fd_in, int fd_out, char *oldpath, char *newpath)
{
Buffer msg;
u_int status, id;
buffer_init(&msg);
/* Send rename request */
id = msg_id++;
buffer_put_char(&msg, SSH2_FXP_RENAME);
buffer_put_int(&msg, id);
buffer_put_cstring(&msg, oldpath);
buffer_put_cstring(&msg, newpath);
send_msg(fd_out, &msg);
debug3("Sent message SSH2_FXP_RENAME \"%s\" -> \"%s\"", oldpath,
newpath);
buffer_free(&msg);
status = get_status(fd_in, id);
if (status != SSH2_FX_OK)
error("Couldn't rename file \"%s\" to \"%s\": %s", oldpath, newpath,
fx2txt(status));
return(status);
}
int
do_download(int fd_in, int fd_out, char *remote_path, char *local_path,
int pflag)
{
int local_fd;
u_int expected_id, handle_len, mode, type, id;
u_int64_t offset;
char *handle;
Buffer msg;
Attrib junk, *a;
int status;
a = do_stat(fd_in, fd_out, remote_path);
if (a == NULL)
return(-1);
/* XXX: should we preserve set[ug]id? */
if (a->flags & SSH2_FILEXFER_ATTR_PERMISSIONS)
mode = S_IWRITE | (a->perm & 0777);
else
mode = 0666;
local_fd = open(local_path, O_WRONLY | O_CREAT | O_TRUNC, mode);
if (local_fd == -1) {
error("Couldn't open local file \"%s\" for writing: %s",
local_path, strerror(errno));
return(errno);
}
buffer_init(&msg);
/* Send open request */
id = msg_id++;
buffer_put_char(&msg, SSH2_FXP_OPEN);
buffer_put_int(&msg, id);
buffer_put_cstring(&msg, remote_path);
buffer_put_int(&msg, SSH2_FXF_READ);
attrib_clear(&junk); /* Send empty attributes */
encode_attrib(&msg, &junk);
send_msg(fd_out, &msg);
debug3("Sent message SSH2_FXP_OPEN I:%d P:%s", id, remote_path);
handle = get_handle(fd_in, id, &handle_len);
if (handle == NULL) {
buffer_free(&msg);
close(local_fd);
return(-1);
}
/* Read from remote and write to local */
offset = 0;
for(;;) {
u_int len;
char *data;
id = expected_id = msg_id++;
buffer_clear(&msg);
buffer_put_char(&msg, SSH2_FXP_READ);
buffer_put_int(&msg, id);
buffer_put_string(&msg, handle, handle_len);
buffer_put_int64(&msg, offset);
buffer_put_int(&msg, COPY_SIZE);
send_msg(fd_out, &msg);
debug3("Sent message SSH2_FXP_READ I:%d O:%llu S:%u",
id, (unsigned long long)offset, COPY_SIZE);
buffer_clear(&msg);
get_msg(fd_in, &msg);
type = buffer_get_char(&msg);
id = buffer_get_int(&msg);
debug3("Received reply T:%d I:%d", type, id);
if (id != expected_id)
fatal("ID mismatch (%d != %d)", id, expected_id);
if (type == SSH2_FXP_STATUS) {
status = buffer_get_int(&msg);
if (status == SSH2_FX_EOF)
break;
else {
error("Couldn't read from remote "
"file \"%s\" : %s", remote_path,
fx2txt(status));
do_close(fd_in, fd_out, handle, handle_len);
goto done;
}
} else if (type != SSH2_FXP_DATA) {
fatal("Expected SSH2_FXP_DATA(%d) packet, got %d",
SSH2_FXP_DATA, type);
}
data = buffer_get_string(&msg, &len);
if (len > COPY_SIZE)
fatal("Received more data than asked for %d > %d",
len, COPY_SIZE);
debug3("In read loop, got %d offset %llu", len,
(unsigned long long)offset);
if (atomic_write(local_fd, data, len) != len) {
error("Couldn't write to \"%s\": %s", local_path,
strerror(errno));
do_close(fd_in, fd_out, handle, handle_len);
status = -1;
xfree(data);
goto done;
}
offset += len;
xfree(data);
}
status = do_close(fd_in, fd_out, handle, handle_len);
/* Override umask and utimes if asked */
if (pflag && fchmod(local_fd, mode) == -1)
error("Couldn't set mode on \"%s\": %s", local_path,
strerror(errno));
if (pflag && (a->flags & SSH2_FILEXFER_ATTR_ACMODTIME)) {
struct timeval tv[2];
tv[0].tv_sec = a->atime;
tv[1].tv_sec = a->mtime;
tv[0].tv_usec = tv[1].tv_usec = 0;
if (utimes(local_path, tv) == -1)
error("Can't set times on \"%s\": %s", local_path,
strerror(errno));
}
done:
close(local_fd);
buffer_free(&msg);
xfree(handle);
return status;
}
int
do_upload(int fd_in, int fd_out, char *local_path, char *remote_path,
int pflag)
{
int local_fd;
u_int handle_len, id;
u_int64_t offset;
char *handle;
Buffer msg;
struct stat sb;
Attrib a;
int status;
if ((local_fd = open(local_path, O_RDONLY, 0)) == -1) {
error("Couldn't open local file \"%s\" for reading: %s",
local_path, strerror(errno));
return(-1);
}
if (fstat(local_fd, &sb) == -1) {
error("Couldn't fstat local file \"%s\": %s",
local_path, strerror(errno));
close(local_fd);
return(-1);
}
stat_to_attrib(&sb, &a);
a.flags &= ~SSH2_FILEXFER_ATTR_SIZE;
a.flags &= ~SSH2_FILEXFER_ATTR_UIDGID;
a.perm &= 0777;
if (!pflag)
a.flags &= ~SSH2_FILEXFER_ATTR_ACMODTIME;
buffer_init(&msg);
/* Send open request */
id = msg_id++;
buffer_put_char(&msg, SSH2_FXP_OPEN);
buffer_put_int(&msg, id);
buffer_put_cstring(&msg, remote_path);
buffer_put_int(&msg, SSH2_FXF_WRITE|SSH2_FXF_CREAT|SSH2_FXF_TRUNC);
encode_attrib(&msg, &a);
send_msg(fd_out, &msg);
debug3("Sent message SSH2_FXP_OPEN I:%d P:%s", id, remote_path);
buffer_clear(&msg);
handle = get_handle(fd_in, id, &handle_len);
if (handle == NULL) {
close(local_fd);
buffer_free(&msg);
return(-1);
}
/* Read from local and write to remote */
offset = 0;
for(;;) {
int len;
char data[COPY_SIZE];
/*
* Can't use atomicio here because it returns 0 on EOF, thus losing
* the last block of the file
*/
do
len = read(local_fd, data, COPY_SIZE);
while ((len == -1) && (errno == EINTR || errno == EAGAIN));
if (len == -1)
fatal("Couldn't read from \"%s\": %s", local_path,
strerror(errno));
if (len == 0)
break;
buffer_clear(&msg);
buffer_put_char(&msg, SSH2_FXP_WRITE);
buffer_put_int(&msg, ++id);
buffer_put_string(&msg, handle, handle_len);
buffer_put_int64(&msg, offset);
buffer_put_string(&msg, data, len);
send_msg(fd_out, &msg);
debug3("Sent message SSH2_FXP_WRITE I:%d O:%llu S:%u",
id, (unsigned long long)offset, len);
status = get_status(fd_in, id);
if (status != SSH2_FX_OK) {
error("Couldn't write to remote file \"%s\": %s",
remote_path, fx2txt(status));
do_close(fd_in, fd_out, handle, handle_len);
close(local_fd);
goto done;
}
debug3("In write loop, got %d offset %llu", len,
(unsigned long long)offset);
offset += len;
}
if (close(local_fd) == -1) {
error("Couldn't close local file \"%s\": %s", local_path,
strerror(errno));
do_close(fd_in, fd_out, handle, handle_len);
status = -1;
goto done;
}
/* Override umask and utimes if asked */
if (pflag)
do_fsetstat(fd_in, fd_out, handle, handle_len, &a);
status = do_close(fd_in, fd_out, handle, handle_len);
done:
xfree(handle);
buffer_free(&msg);
return status;
}