You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
118 lines
2.7 KiB
118 lines
2.7 KiB
/* $OpenBSD: sshbuf-io.c,v 1.2 2020/01/25 23:28:06 djm Exp $ */
|
|
/*
|
|
* Copyright (c) 2011 Damien Miller
|
|
*
|
|
* 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 <errno.h>
|
|
#include <fcntl.h>
|
|
#include <unistd.h>
|
|
#include <string.h>
|
|
|
|
#include "ssherr.h"
|
|
#include "sshbuf.h"
|
|
#include "atomicio.h"
|
|
|
|
/* Load a file from a fd into a buffer */
|
|
int
|
|
sshbuf_load_fd(int fd, struct sshbuf **blobp)
|
|
{
|
|
u_char buf[4096];
|
|
size_t len;
|
|
struct stat st;
|
|
int r;
|
|
struct sshbuf *blob;
|
|
|
|
*blobp = NULL;
|
|
|
|
if (fstat(fd, &st) == -1)
|
|
return SSH_ERR_SYSTEM_ERROR;
|
|
if ((st.st_mode & (S_IFSOCK|S_IFCHR|S_IFIFO)) == 0 &&
|
|
st.st_size > SSHBUF_SIZE_MAX)
|
|
return SSH_ERR_INVALID_FORMAT;
|
|
if ((blob = sshbuf_new()) == NULL)
|
|
return SSH_ERR_ALLOC_FAIL;
|
|
for (;;) {
|
|
if ((len = atomicio(read, fd, buf, sizeof(buf))) == 0) {
|
|
if (errno == EPIPE)
|
|
break;
|
|
r = SSH_ERR_SYSTEM_ERROR;
|
|
goto out;
|
|
}
|
|
if ((r = sshbuf_put(blob, buf, len)) != 0)
|
|
goto out;
|
|
if (sshbuf_len(blob) > SSHBUF_SIZE_MAX) {
|
|
r = SSH_ERR_INVALID_FORMAT;
|
|
goto out;
|
|
}
|
|
}
|
|
if ((st.st_mode & (S_IFSOCK|S_IFCHR|S_IFIFO)) == 0 &&
|
|
st.st_size != (off_t)sshbuf_len(blob)) {
|
|
r = SSH_ERR_FILE_CHANGED;
|
|
goto out;
|
|
}
|
|
/* success */
|
|
*blobp = blob;
|
|
blob = NULL; /* transferred */
|
|
r = 0;
|
|
out:
|
|
explicit_bzero(buf, sizeof(buf));
|
|
sshbuf_free(blob);
|
|
return r;
|
|
}
|
|
|
|
int
|
|
sshbuf_load_file(const char *path, struct sshbuf **bufp)
|
|
{
|
|
int r, fd, oerrno;
|
|
|
|
*bufp = NULL;
|
|
if ((fd = open(path, O_RDONLY)) == -1)
|
|
return SSH_ERR_SYSTEM_ERROR;
|
|
if ((r = sshbuf_load_fd(fd, bufp)) != 0)
|
|
goto out;
|
|
/* success */
|
|
r = 0;
|
|
out:
|
|
oerrno = errno;
|
|
close(fd);
|
|
if (r != 0)
|
|
errno = oerrno;
|
|
return r;
|
|
}
|
|
|
|
int
|
|
sshbuf_write_file(const char *path, struct sshbuf *buf)
|
|
{
|
|
int fd, oerrno;
|
|
|
|
if ((fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, 0644)) == -1)
|
|
return SSH_ERR_SYSTEM_ERROR;
|
|
if (atomicio(vwrite, fd, sshbuf_mutable_ptr(buf),
|
|
sshbuf_len(buf)) != sshbuf_len(buf) || close(fd) != 0) {
|
|
oerrno = errno;
|
|
close(fd);
|
|
unlink(path);
|
|
errno = oerrno;
|
|
return SSH_ERR_SYSTEM_ERROR;
|
|
}
|
|
return 0;
|
|
}
|
|
|