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/* -*- Mode: C; c-file-style: "bsd" -*- */
/* trustdb.c - High level interface for ownertrust handling
* Copyright (C) 2001, 2002, 2003 Timo Schulz
*
* This file is part of OpenCDK.
*
* OpenCDK 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 2 of the License, or
* (at your option) any later version.
*
* OpenCDK 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 OpenCDK; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdio.h>
#include "opencdk.h"
#include "main.h"
#define TRUST_MASK 15
#define RECORD_SIZE 40
#define MIN_TRUSTDB_VER 3
enum {
TDB_RECORD_TRUST = 12,
TDB_RECORD_VALID = 13,
};
struct tdb_record_s {
int recno;
union {
struct {
byte reserved;
byte fpr[20];
int ownertrust;
byte depth;
u32 validlist;
} trust;
struct {
byte reserved;
byte fpr[20];
u32 next;
int valid;
} valid;
} u;
};
typedef struct tdb_record_s *tdb_record_t;
static void
trustdb_rec_release( tdb_record_t rec )
{
if( rec ) {
rec->recno = 0;
cdk_free( rec );
}
}
static tdb_record_t
trustdb_rec_new( void )
{
tdb_record_t rec;
rec = cdk_calloc( 1, sizeof *rec );
if( !rec )
return NULL;
return rec;
}
static int
trustdb_check( cdk_stream_t a, int req_ver )
{
int rc = 0;
int c = 0, nread;
byte magic[3];
cdk_stream_seek( a, 0 );
c = cdk_stream_getc( a );
if( c == EOF || c != 1 )
return CDK_General_Error;
nread = cdk_stream_read( a, magic, 3 );
if( nread == EOF )
return CDK_File_Error;
c = cdk_stream_getc( a );
if( c == EOF )
rc = CDK_General_Error;
else if( c < req_ver )
rc = CDK_Wrong_Format;
return rc;
}
static int
trustdb_rec_parse( cdk_stream_t buf, tdb_record_t r )
{
size_t n;
int recno;
if( !buf || !r )
return CDK_Inv_Value;
recno = cdk_stream_getc( buf );
if( recno == EOF )
return EOF;
switch( recno ) {
case TDB_RECORD_TRUST: /* trust record: new */
r->recno = 12;
r->u.trust.reserved = cdk_stream_getc (buf);
n = cdk_stream_read (buf, r->u.trust.fpr, 20);
r->u.trust.ownertrust = cdk_stream_getc (buf);
r->u.trust.depth = cdk_stream_getc (buf);
r->u.trust.validlist = 0;
n = 4;
while (n--)
cdk_stream_getc (buf);
n = RECORD_SIZE - 28;
while (n--)
cdk_stream_getc (buf);
if (r->u.trust.ownertrust == EOF)
return CDK_EOF;
break;
case TDB_RECORD_VALID: /* valid record: new */
r->recno = 13;
r->u.valid.reserved = cdk_stream_getc (buf);
n = cdk_stream_read (buf, r->u.valid.fpr, 20);
r->u.valid.valid = cdk_stream_getc (buf);
r->u.valid.next = 0;
n = 4;
while (n--)
cdk_stream_getc (buf);
n = RECORD_SIZE - 27;
while (n--)
cdk_stream_getc (buf);
if (r->u.valid.valid == EOF)
return CDK_EOF;
break;
default:
n = RECORD_SIZE - 1;
while (n--)
cdk_stream_getc (buf);
break;
}
r->recno = recno;
return 0;
}
tdb_record_t
trustdb_rec_byfpr( cdk_stream_t buf, int type,
const byte * fpr, size_t fprlen )
{
tdb_record_t rec;
if (!fpr || !buf)
return NULL;
rec = trustdb_rec_new ();
if( !rec )
return NULL;
while( trustdb_rec_parse( buf, rec ) != EOF ) {
if( rec->recno != type )
continue;
switch( type ) {
case TDB_RECORD_VALID:
if( !memcmp( fpr, rec->u.valid.fpr, fprlen ) )
return rec;
break;
case TDB_RECORD_TRUST:
if( !memcmp( rec->u.trust.fpr, fpr, fprlen ) )
return rec;
break;
}
}
trustdb_rec_release ( rec );
rec = NULL;
return rec;
}
int
cdk_trustdb_get_ownertrust( cdk_stream_t inp, cdk_pkt_pubkey_t pk,
int *r_val, int *r_flags )
{
tdb_record_t rec = NULL;
byte fpr[20];
int flags = 0;
int rc;
if( !inp || !r_val || !r_flags || !pk )
return CDK_Inv_Value;
rc = trustdb_check( inp, MIN_TRUSTDB_VER );
if( rc )
return rc;
*r_val = CDK_TRUST_UNKNOWN;
cdk_pk_get_fingerprint( pk, fpr );
cdk_stream_seek( inp, 0 );
rec = trustdb_rec_byfpr( inp, TDB_RECORD_TRUST, fpr, 20 );
if( rec ) {
*r_val = rec->u.trust.ownertrust & TRUST_MASK;
if( *r_val & CDK_TFLAG_REVOKED )
flags |= CDK_TFLAG_REVOKED;
if( *r_val & CDK_TFLAG_SUB_REVOKED )
flags |= CDK_TFLAG_SUB_REVOKED;
if( *r_val & CDK_TFLAG_DISABLED )
flags |= CDK_TFLAG_DISABLED;
*r_flags = flags;
rc = 0;
}
trustdb_rec_release( rec );
return rc;
}
int
cdk_trustdb_get_validity( cdk_stream_t inp, cdk_pkt_userid_t id, int *r_val )
{
cdk_md_hd_t rmd;
tdb_record_t rec;
byte * fpr;
int rc;
if( !inp || !r_val || !id )
return CDK_Inv_Value;
rc = trustdb_check( inp, MIN_TRUSTDB_VER );
if( rc )
return rc;
*r_val = CDK_TRUST_UNKNOWN;
rmd = cdk_md_open( CDK_MD_RMD160, 0 );
if( !rmd )
return CDK_Gcry_Error;
cdk_md_write( rmd, id->name, id->len );
cdk_md_final( rmd );
fpr = cdk_md_read( rmd, CDK_MD_RMD160 );
cdk_stream_seek( inp, 0 );
rec = trustdb_rec_byfpr( inp, TDB_RECORD_VALID, fpr, 20 );
if( rec ) {
*r_val = rec->u.valid.valid;
rc = 0;
}
trustdb_rec_release( rec );
cdk_md_close( rmd );
return rc;
}
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