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/*
* pgp-info.c
* Provide info about PGP data.
*
* Copyright (c) 2005 Marko Kreen
* 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
*
* $PostgreSQL: pgsql/contrib/pgcrypto/pgp-info.c,v 1.5 2009/06/11 14:48:52 momjian Exp $
*/
#include "postgres.h"
#include "px.h"
#include "mbuf.h"
#include "pgp.h"
static int
read_pubkey_keyid(PullFilter *pkt, uint8 *keyid_buf)
{
int res;
PGP_PubKey *pk = NULL;
res = _pgp_read_public_key(pkt, &pk);
if (res < 0)
goto err;
/* skip secret key part, if it exists */
res = pgp_skip_packet(pkt);
if (res < 0)
goto err;
/* is it encryption key */
switch (pk->algo)
{
case PGP_PUB_ELG_ENCRYPT:
case PGP_PUB_RSA_ENCRYPT:
case PGP_PUB_RSA_ENCRYPT_SIGN:
memcpy(keyid_buf, pk->key_id, 8);
res = 1;
break;
default:
res = 0;
}
err:
pgp_key_free(pk);
return res;
}
static int
read_pubenc_keyid(PullFilter *pkt, uint8 *keyid_buf)
{
uint8 ver;
int res;
GETBYTE(pkt, ver);
if (ver != 3)
return -1;
res = pullf_read_fixed(pkt, 8, keyid_buf);
if (res < 0)
return res;
return pgp_skip_packet(pkt);
}
static const char hextbl[] = "0123456789ABCDEF";
static int
print_key(uint8 *keyid, char *dst)
{
int i;
unsigned c;
for (i = 0; i < 8; i++)
{
c = keyid[i];
*dst++ = hextbl[(c >> 4) & 0x0F];
*dst++ = hextbl[c & 0x0F];
}
*dst = 0;
return 8 * 2;
}
static const uint8 any_key[] =
{0, 0, 0, 0, 0, 0, 0, 0};
/*
* dst should have room for 17 bytes
*/
int
pgp_get_keyid(MBuf *pgp_data, char *dst)
{
int res;
PullFilter *src;
PullFilter *pkt = NULL;
int len;
uint8 tag;
int got_pub_key = 0,
got_symenc_key = 0,
got_pubenc_key = 0;
int got_data = 0;
uint8 keyid_buf[8];
int got_main_key = 0;
res = pullf_create_mbuf_reader(&src, pgp_data);
if (res < 0)
return res;
while (1)
{
res = pgp_parse_pkt_hdr(src, &tag, &len, 0);
if (res <= 0)
break;
res = pgp_create_pkt_reader(&pkt, src, len, res, NULL);
if (res < 0)
break;
switch (tag)
{
case PGP_PKT_SECRET_KEY:
case PGP_PKT_PUBLIC_KEY:
/* main key is for signing, so ignore it */
if (!got_main_key)
{
got_main_key = 1;
res = pgp_skip_packet(pkt);
}
else
res = PXE_PGP_MULTIPLE_KEYS;
break;
case PGP_PKT_SECRET_SUBKEY:
case PGP_PKT_PUBLIC_SUBKEY:
res = read_pubkey_keyid(pkt, keyid_buf);
if (res < 0)
break;
if (res > 0)
got_pub_key++;
break;
case PGP_PKT_PUBENCRYPTED_SESSKEY:
got_pubenc_key++;
res = read_pubenc_keyid(pkt, keyid_buf);
break;
case PGP_PKT_SYMENCRYPTED_DATA:
case PGP_PKT_SYMENCRYPTED_DATA_MDC:
/* don't skip it, just stop */
got_data = 1;
break;
case PGP_PKT_SYMENCRYPTED_SESSKEY:
got_symenc_key++;
/* fallthru */
case PGP_PKT_SIGNATURE:
case PGP_PKT_MARKER:
case PGP_PKT_TRUST:
case PGP_PKT_USER_ID:
case PGP_PKT_USER_ATTR:
case PGP_PKT_PRIV_61:
res = pgp_skip_packet(pkt);
break;
default:
res = PXE_PGP_CORRUPT_DATA;
}
if (pkt)
pullf_free(pkt);
pkt = NULL;
if (res < 0 || got_data)
break;
}
pullf_free(src);
if (pkt)
pullf_free(pkt);
if (res < 0)
return res;
/* now check sanity */
if (got_pub_key && got_pubenc_key)
res = PXE_PGP_CORRUPT_DATA;
if (got_pub_key > 1)
res = PXE_PGP_MULTIPLE_KEYS;
if (got_pubenc_key > 1)
res = PXE_PGP_MULTIPLE_KEYS;
/*
* if still ok, look what we got
*/
if (res >= 0)
{
if (got_pubenc_key || got_pub_key)
{
if (memcmp(keyid_buf, any_key, 8) == 0)
{
memcpy(dst, "ANYKEY", 7);
res = 6;
}
else
res = print_key(keyid_buf, dst);
}
else if (got_symenc_key)
{
memcpy(dst, "SYMKEY", 7);
res = 6;
}
else
res = PXE_PGP_NO_USABLE_KEY;
}
return res;
}
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