IABSD.fr/src/usr.bin/ssh/sshbuf-io.c

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• Author : djm
  Date : 2020-01-25 23:28:06
  Hash : bb3c2609
  Message : tidy headers; some junk snuck into sshbuf-misc.c and sshbuf-io.c doesn't need SSHBUF_INTERNAL set

• usr.bin/ssh/sshbuf-io.c

• /*	$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 <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;
  }