Adding upstream version 2.2.27.upstream/2.2.27upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 190 insertions, 0 deletions

diff --git a/kbx/keybox-file.c b/kbx/keybox-file.c
new file mode 100644
index 0000000..c36f5be
--- /dev/null
+++ b/kbx/keybox-file.c
@@ -0,0 +1,190 @@
+/* keybox-file.c - File operations
+ *	Copyright (C) 2001, 2003 Free Software Foundation, Inc.
+ *
+ * This file is part of GnuPG.
+ *
+ * GnuPG is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuPG is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include <config.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <time.h>
+
+#include "keybox-defs.h"
+
+
+#define IMAGELEN_LIMIT (5*1024*1024)
+
+
+#if !defined(HAVE_FTELLO) && !defined(ftello)
+static off_t
+ftello (FILE *stream)
+{
+  long int off;
+
+  off = ftell (stream);
+  if (off == -1)
+    return (off_t)-1;
+  return off;
+}
+#endif /* !defined(HAVE_FTELLO) && !defined(ftello) */
+
+
+
+/* Read a block at the current position and return it in R_BLOB.
+   R_BLOB may be NULL to simply skip the current block.  */
+int
+_keybox_read_blob (KEYBOXBLOB *r_blob, estream_t fp, int *skipped_deleted)
+{
+  unsigned char *image;
+  size_t imagelen = 0;
+  int c1, c2, c3, c4, type;
+  int rc;
+  off_t off;
+
+  if (skipped_deleted)
+    *skipped_deleted = 0;
+ again:
+  if (r_blob)
+    *r_blob = NULL;
+  off = es_ftello (fp);
+  if (off == (off_t)-1)
+    return gpg_error_from_syserror ();
+
+  if ((c1 = es_getc (fp)) == EOF
+      || (c2 = es_getc (fp)) == EOF
+      || (c3 = es_getc (fp)) == EOF
+      || (c4 = es_getc (fp)) == EOF
+      || (type = es_getc (fp)) == EOF)
+    {
+      if ( c1 == EOF && !es_ferror (fp) )
+        return -1; /* eof */
+      if (!es_ferror (fp))
+        return gpg_error (GPG_ERR_TOO_SHORT);
+      return gpg_error_from_syserror ();
+    }
+
+  imagelen = ((unsigned int) c1 << 24) | (c2 << 16) | (c3 << 8 ) | c4;
+  if (imagelen < 5)
+    return gpg_error (GPG_ERR_TOO_SHORT);
+
+  if (!type)
+    {
+      /* Special treatment for empty blobs. */
+      if (es_fseek (fp, imagelen-5, SEEK_CUR))
+        return gpg_error_from_syserror ();
+      if (skipped_deleted)
+        *skipped_deleted = 1;
+      goto again;
+    }
+
+  if (imagelen > IMAGELEN_LIMIT) /* Sanity check. */
+    {
+      /* Seek forward so that the caller may choose to ignore this
+         record.  */
+      if (es_fseek (fp, imagelen-5, SEEK_CUR))
+        return gpg_error_from_syserror ();
+      return gpg_error (GPG_ERR_TOO_LARGE);
+    }
+
+  if (!r_blob)
+    {
+      /* This blob shall be skipped.  */
+      if (es_fseek (fp, imagelen-5, SEEK_CUR))
+        return gpg_error_from_syserror ();
+      return 0;
+    }
+
+  image = xtrymalloc (imagelen);
+  if (!image)
+    return gpg_error_from_syserror ();
+
+  image[0] = c1; image[1] = c2; image[2] = c3; image[3] = c4; image[4] = type;
+  if (es_fread (image+5, imagelen-5, 1, fp) != 1)
+    {
+      gpg_error_t tmperr = gpg_error_from_syserror ();
+      xfree (image);
+      return tmperr;
+    }
+
+  rc = _keybox_new_blob (r_blob, image, imagelen, off);
+  if (rc)
+    xfree (image);
+  return rc;
+}
+
+
+/* Write the block to the current file position */
+int
+_keybox_write_blob (KEYBOXBLOB blob, estream_t fp, FILE *outfp)
+{
+  const unsigned char *image;
+  size_t length;
+
+  image = _keybox_get_blob_image (blob, &length);
+
+  if (length > IMAGELEN_LIMIT)
+    return gpg_error (GPG_ERR_TOO_LARGE);
+
+  if (fp)
+    {
+      if (es_fwrite (image, length, 1, fp) != 1)
+        return gpg_error_from_syserror ();
+    }
+  else
+    {
+      if (fwrite (image, length, 1, outfp) != 1)
+        return gpg_error_from_syserror ();
+    }
+
+  return 0;
+}
+
+
+/* Write a fresh header type blob. */
+int
+_keybox_write_header_blob (estream_t fp, int for_openpgp)
+{
+  unsigned char image[32];
+  u32 val;
+
+  memset (image, 0, sizeof image);
+  /* Length of this blob. */
+  image[3] = 32;
+
+  image[4] = KEYBOX_BLOBTYPE_HEADER;
+  image[5] = 1; /* Version */
+  if (for_openpgp)
+    image[7] = 0x02; /* OpenPGP data may be available.  */
+
+  memcpy (image+8, "KBXf", 4);
+  val = time (NULL);
+  /* created_at and last maintenance run. */
+  image[16]   = (val >> 24);
+  image[16+1] = (val >> 16);
+  image[16+2] = (val >>  8);
+  image[16+3] = (val      );
+  image[20]   = (val >> 24);
+  image[20+1] = (val >> 16);
+  image[20+2] = (val >>  8);
+  image[20+3] = (val      );
+
+  if (es_fwrite (image, 32, 1, fp) != 1)
+    return gpg_error_from_syserror ();
+
+  return 0;
+}