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157030271f
* common/sysutils.c (gnupg_stat): New. * common/sysutils.h: Include sys/stat.h. -- Yet another wrapper for Unicode support on Windows. GnuPG-bug-id: 5098 Signed-off-by: Werner Koch <wk@gnupg.org> Backported-from-master: 18e5dd7b03ced51611c9ba1345cf498a0aaf14a6)
303 lines
8.9 KiB
C
303 lines
8.9 KiB
C
/* create.c - Create a new crypto container
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* Copyright (C) 2009 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <https://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <assert.h>
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#include "g13.h"
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#include "../common/i18n.h"
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#include "create.h"
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#include "keyblob.h"
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#include "backend.h"
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#include "g13tuple.h"
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#include "../common/call-gpg.h"
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/* Create a new blob with all the session keys and other meta
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information which are to be stored encrypted in the crypto
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container header. On success the malloced blob is stored at R_BLOB
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and its length at R_BLOBLEN. On error an error code is returned
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and (R_BLOB,R_BLOBLEN) are set to (NULL,0).
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The format of this blob is a sequence of tag-length-value tuples.
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All tuples have this format:
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2 byte TAG Big endian unsigned integer (0..65535)
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described by the KEYBLOB_TAG_ constants.
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2 byte LENGTH Big endian unsigned integer (0..65535)
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giving the length of the value.
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length bytes VALUE The value described by the tag.
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The first tag in a keyblob must be a BLOBVERSION. The other tags
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depend on the type of the container as described by the CONTTYPE
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tag. See keyblob.h for details. */
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static gpg_error_t
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create_new_keyblob (ctrl_t ctrl, int is_detached,
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void **r_blob, size_t *r_bloblen)
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{
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gpg_error_t err;
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unsigned char twobyte[2];
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membuf_t mb;
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*r_blob = NULL;
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*r_bloblen = 0;
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init_membuf_secure (&mb, 512);
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append_tuple (&mb, KEYBLOB_TAG_BLOBVERSION, "\x01", 1);
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twobyte[0] = (ctrl->conttype >> 8);
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twobyte[1] = (ctrl->conttype);
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append_tuple (&mb, KEYBLOB_TAG_CONTTYPE, twobyte, 2);
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if (is_detached)
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append_tuple (&mb, KEYBLOB_TAG_DETACHED, NULL, 0);
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err = be_create_new_keys (ctrl->conttype, &mb);
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if (err)
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goto leave;
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/* Just for testing. */
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append_tuple (&mb, KEYBLOB_TAG_FILLER, "filler", 6);
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*r_blob = get_membuf (&mb, r_bloblen);
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if (!*r_blob)
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{
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err = gpg_error_from_syserror ();
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*r_bloblen = 0;
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}
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else
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log_debug ("used keyblob size is %zu\n", *r_bloblen);
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leave:
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xfree (get_membuf (&mb, NULL));
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return err;
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}
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/* Encrypt the keyblob (KEYBLOB,KEYBLOBLEN) and store the result at
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(R_ENCBLOB, R_ENCBLOBLEN). Returns 0 on success or an error code.
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On error R_EKYBLOB is set to NULL. Depending on the keys set in
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CTRL the result is a single OpenPGP binary message, a single
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special OpenPGP packet encapsulating a CMS message or a
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concatenation of both with the CMS packet being the last. */
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gpg_error_t
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g13_encrypt_keyblob (ctrl_t ctrl, void *keyblob, size_t keybloblen,
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void **r_encblob, size_t *r_encbloblen)
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{
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gpg_error_t err;
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/* FIXME: For now we only implement OpenPGP. */
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err = gpg_encrypt_blob (ctrl, opt.gpg_program, opt.gpg_arguments,
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keyblob, keybloblen,
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ctrl->recipients,
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r_encblob, r_encbloblen);
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return err;
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}
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/* Write a new file under the name FILENAME with the keyblob and an
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appropriate header. This function is called with a lock file in
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place and after checking that the filename does not exists. */
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static gpg_error_t
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write_keyblob (const char *filename,
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const void *keyblob, size_t keybloblen)
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{
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gpg_error_t err;
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estream_t fp;
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unsigned char packet[32];
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size_t headerlen, paddinglen;
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fp = es_fopen (filename, "wbx");
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if (!fp)
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{
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err = gpg_error_from_syserror ();
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log_error ("error creating new container '%s': %s\n",
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filename, gpg_strerror (err));
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return err;
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}
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/* Allow for an least 8 times larger keyblob to accommodate for
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future key changes. Round it up to 4096 byte. */
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headerlen = ((32 + 8 * keybloblen + 16) + 4095) / 4096 * 4096;
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paddinglen = headerlen - 32 - keybloblen;
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assert (paddinglen >= 16);
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packet[0] = (0xc0|61); /* CTB for the private packet type 0x61. */
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packet[1] = 0xff; /* 5 byte length packet, value 20. */
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packet[2] = 0;
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packet[3] = 0;
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packet[4] = 0;
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packet[5] = 26;
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memcpy (packet+6, "GnuPG/G13", 10); /* Packet subtype. */
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packet[16] = 1; /* G13 packet format version. */
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packet[17] = 0; /* Reserved. */
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packet[18] = 0; /* Reserved. */
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packet[19] = 0; /* OS Flag. */
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packet[20] = (headerlen >> 24); /* Total length of header. */
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packet[21] = (headerlen >> 16);
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packet[22] = (headerlen >> 8);
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packet[23] = (headerlen);
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packet[24] = 1; /* Number of header copies. */
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packet[25] = 0; /* Number of header copies at the end. */
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packet[26] = 0; /* Reserved. */
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packet[27] = 0; /* Reserved. */
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packet[28] = 0; /* Reserved. */
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packet[29] = 0; /* Reserved. */
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packet[30] = 0; /* Reserved. */
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packet[31] = 0; /* Reserved. */
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if (es_fwrite (packet, 32, 1, fp) != 1)
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goto writeerr;
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if (es_fwrite (keyblob, keybloblen, 1, fp) != 1)
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goto writeerr;
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/* Write the padding. */
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packet[0] = (0xc0|61); /* CTB for Private packet type 0x61. */
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packet[1] = 0xff; /* 5 byte length packet, value 20. */
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packet[2] = (paddinglen-6) >> 24;
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packet[3] = (paddinglen-6) >> 16;
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packet[4] = (paddinglen-6) >> 8;
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packet[5] = (paddinglen-6);
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memcpy (packet+6, "GnuPG/PAD", 10); /* Packet subtype. */
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if (es_fwrite (packet, 16, 1, fp) != 1)
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goto writeerr;
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memset (packet, 0, 32);
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for (paddinglen-=16; paddinglen >= 32; paddinglen -= 32)
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if (es_fwrite (packet, 32, 1, fp) != 1)
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goto writeerr;
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if (paddinglen)
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if (es_fwrite (packet, paddinglen, 1, fp) != 1)
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goto writeerr;
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if (es_fclose (fp))
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{
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err = gpg_error_from_syserror ();
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log_error ("error closing '%s': %s\n",
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filename, gpg_strerror (err));
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remove (filename);
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return err;
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}
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return 0;
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writeerr:
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err = gpg_error_from_syserror ();
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log_error ("error writing header to '%s': %s\n",
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filename, gpg_strerror (err));
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es_fclose (fp);
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remove (filename);
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return err;
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}
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/* Create a new container under the name FILENAME and initialize it
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using the current settings. If the file already exists an error is
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returned. */
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gpg_error_t
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g13_create_container (ctrl_t ctrl, const char *filename)
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{
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gpg_error_t err;
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dotlock_t lock;
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void *keyblob = NULL;
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size_t keybloblen;
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void *enckeyblob = NULL;
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size_t enckeybloblen;
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char *detachedname = NULL;
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int detachedisdir;
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tupledesc_t tuples = NULL;
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unsigned int dummy_rid;
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if (!ctrl->recipients)
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return gpg_error (GPG_ERR_NO_PUBKEY);
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err = be_take_lock_for_create (ctrl, filename, &lock);
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if (err)
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goto leave;
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/* And a possible detached file or directory may not exist either. */
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err = be_get_detached_name (ctrl->conttype, filename,
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&detachedname, &detachedisdir);
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if (err)
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goto leave;
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if (detachedname)
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{
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struct stat sb;
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if (!gnupg_stat (detachedname, &sb))
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{
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err = gpg_error (GPG_ERR_EEXIST);
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goto leave;
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}
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}
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if (ctrl->conttype != CONTTYPE_DM_CRYPT)
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{
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/* Create a new keyblob. */
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err = create_new_keyblob (ctrl, !!detachedname, &keyblob, &keybloblen);
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if (err)
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goto leave;
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/* Encrypt that keyblob. */
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err = g13_encrypt_keyblob (ctrl, keyblob, keybloblen,
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&enckeyblob, &enckeybloblen);
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if (err)
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goto leave;
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/* Put a copy of the keyblob into a tuple structure. */
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err = create_tupledesc (&tuples, keyblob, keybloblen);
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if (err)
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goto leave;
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keyblob = NULL;
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/* if (opt.verbose) */
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/* dump_keyblob (tuples); */
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/* Write out the header, the encrypted keyblob and some padding. */
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err = write_keyblob (filename, enckeyblob, enckeybloblen);
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if (err)
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goto leave;
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}
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/* Create and append the container. FIXME: We should pass the
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estream object in addition to the filename, so that the backend
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can append the container to the g13 file. */
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err = be_create_container (ctrl, ctrl->conttype, filename, -1, tuples,
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&dummy_rid);
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leave:
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destroy_tupledesc (tuples);
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xfree (detachedname);
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xfree (enckeyblob);
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xfree (keyblob);
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dotlock_destroy (lock);
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return err;
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}
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