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gnupg/g10/trustdb.c

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/* trustdb.c
* Copyright (C) 1998 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <ctype.h>
#include <assert.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include "errors.h"
#include "iobuf.h"
#include "keydb.h"
#include "memory.h"
#include "util.h"
#include "trustdb.h"
#include "options.h"
#include "packet.h"
#include "main.h"
#include "i18n.h"
#include "tdbio.h"
#if MAX_FINGERPRINT_LEN > 20
#error Must change structure of trustdb
#endif
struct local_id_item {
struct local_id_item *next;
ulong lid;
unsigned flag;
};
struct local_id_table {
struct local_id_table *next; /* only used to keep a list of unused tables */
struct local_id_item *items[16];
};
typedef struct local_id_table *LOCAL_ID_TABLE;
typedef struct trust_info TRUST_INFO;
struct trust_info {
ulong lid;
byte otrust; /* ownertrust (assigned trust) */
byte trust; /* calculated trust (validity) */
};
typedef struct trust_seg_list *TRUST_SEG_LIST;
struct trust_seg_list {
TRUST_SEG_LIST next;
int pathlen;
TRUST_INFO path[1];
};
struct recno_list_struct {
struct recno_list_struct *next;
ulong recno;
int type;
};
typedef struct recno_list_struct *RECNO_LIST;
static int walk_sigrecs( SIGREC_CONTEXT *c );
static LOCAL_ID_TABLE new_lid_table(void);
static void release_lid_table( LOCAL_ID_TABLE tbl );
static int ins_lid_table_item( LOCAL_ID_TABLE tbl, ulong lid, unsigned flag );
static int qry_lid_table_flag( LOCAL_ID_TABLE tbl, ulong lid, unsigned *flag );
static void print_user_id( const char *text, u32 *keyid );
static int list_sigs( ulong pubkey_id );
static int do_check( TRUSTREC *drec, unsigned *trustlevel );
static int get_dir_record( PKT_public_key *pk, TRUSTREC *rec );
static void upd_pref_record( TRUSTREC *urec, u32 *keyid, PKT_signature *sig );
static void upd_cert_record( KBNODE keyblock, KBNODE signode, u32 *keyid,
TRUSTREC *drec, RECNO_LIST *recno_list, int recheck,
TRUSTREC *urec, const byte *uidhash, int revoke );
/* a table used to keep track of ultimately trusted keys
* which are the ones from our secrings */
static LOCAL_ID_TABLE ultikey_table;
/* list of unused lid items and tables */
static LOCAL_ID_TABLE unused_lid_tables;
static struct local_id_item *unused_lid_items;
#define HEXTOBIN(a) ( (a) >= '0' && (a) <= '9' ? ((a)-'0') : \
(a) >= 'A' && (a) <= 'F' ? ((a)-'A'+10) : ((a)-'a'+10))
/**********************************************
*********** record read write **************
**********************************************/
static void
die_invalid_db()
{
log_error(_(
"The trust DB is corrupted; please run \"gpgm --fix-trust-db\".\n") );
g10_exit(2);
}
/****************
* Read a record but die if it does not exist
*/
static void
read_record( ulong recno, TRUSTREC *rec, int rectype )
{
int rc = tdbio_read_record( recno, rec, rectype );
if( !rc )
return;
log_error(_("trust record %lu, req type %d: read failed: %s\n"),
recno, rectype, g10_errstr(rc) );
die_invalid_db();
}
/****************
* Wirte a record but die on error
*/
static void
write_record( TRUSTREC *rec )
{
int rc = tdbio_write_record( rec );
if( !rc )
return;
log_error(_("trust record %lu, type %d: write failed: %s\n"),
rec->recnum, rec->rectype, g10_errstr(rc) );
die_invalid_db();
}
/****************
* Delete a record but die on error
*/
static void
delete_record( ulong recno )
{
int rc = tdbio_delete_record( recno );
if( !rc )
return;
log_error(_("trust record %lu: delete failed: %s\n"),
recno, g10_errstr(rc) );
die_invalid_db();
}
/****************
* sync the db
*/
static void
do_sync( )
{
int rc = tdbio_sync();
if( !rc )
return;
log_error(_("trust db: sync failed: %s\n"), g10_errstr(rc) );
g10_exit(2);
}
/**********************************************
************* list helpers *******************
**********************************************/
/****************
* Insert a new item into a recno list
*/
static void
ins_recno_list( RECNO_LIST *head, ulong recno, int type )
{
RECNO_LIST item = m_alloc( sizeof *item );
item->recno = recno;
item->type = type;
item->next = *head;
*head = item;
}
static RECNO_LIST
qry_recno_list( RECNO_LIST list, ulong recno, int type )
{
for( ; list; list = list->next ) {
if( list->recno == recno && (!type || list->type == type) )
return list;
}
return NULL;
}
static void
rel_recno_list( RECNO_LIST *head )
{
RECNO_LIST r, r2;
for(r = *head; r; r = r2 ) {
r2 = r->next;
m_free(r);
}
*head = NULL;
}
static LOCAL_ID_TABLE
new_lid_table(void)
{
LOCAL_ID_TABLE a;
a = unused_lid_tables;
if( a ) {
unused_lid_tables = a->next;
memset( a, 0, sizeof *a );
}
else
a = m_alloc_clear( sizeof *a );
return a;
}
static void
release_lid_table( LOCAL_ID_TABLE tbl )
{
struct local_id_item *a, *a2;
int i;
for(i=0; i < 16; i++ ) {
for(a=tbl->items[i]; a; a = a2 ) {
a2 = a->next;
a->next = unused_lid_items;
unused_lid_items = a;
}
}
tbl->next = unused_lid_tables;
unused_lid_tables = tbl;
}
/****************
* Add a new item to the table or return 1 if we already have this item
*/
static int
ins_lid_table_item( LOCAL_ID_TABLE tbl, ulong lid, unsigned flag )
{
struct local_id_item *a;
for( a = tbl->items[lid & 0x0f]; a; a = a->next )
if( a->lid == lid )
return 1;
a = unused_lid_items;
if( a )
unused_lid_items = a->next;
else
a = m_alloc( sizeof *a );
a->lid = lid;
a->flag = flag;
a->next = tbl->items[lid & 0x0f];
tbl->items[lid & 0x0f] = a;
return 0;
}
static int
qry_lid_table_flag( LOCAL_ID_TABLE tbl, ulong lid, unsigned *flag )
{
struct local_id_item *a;
for( a = tbl->items[lid & 0x0f]; a; a = a->next )
if( a->lid == lid ) {
if( flag )
*flag = a->flag;
return 0;
}
return -1;
}
/****************
* Return the keyid from the primary key identified by LID.
*/
int
keyid_from_lid( ulong lid, u32 *keyid )
{
TRUSTREC rec;
int rc;
rc = tdbio_read_record( lid, &rec, 0 );
if( rc ) {
log_error(_("error reading dir record for LID %lu: %s\n"),
lid, g10_errstr(rc));
return G10ERR_TRUSTDB;
}
if( rec.rectype == RECTYPE_SDIR )
return 0;
if( rec.rectype != RECTYPE_DIR ) {
log_error(_("lid %lu: expected dir record, got type %d\n"),
lid, rec.rectype );
return G10ERR_TRUSTDB;
}
if( !rec.r.dir.keylist ) {
log_error(_("no primary key for LID %lu\n"), lid );
return G10ERR_TRUSTDB;
}
rc = tdbio_read_record( rec.r.dir.keylist, &rec, RECTYPE_KEY );
if( rc ) {
log_error(_("error reading primary key for LID %lu: %s\n"),
lid, g10_errstr(rc));
return G10ERR_TRUSTDB;
}
keyid_from_fingerprint( rec.r.key.fingerprint, rec.r.key.fingerprint_len,
keyid );
return 0;
}
ulong
lid_from_keyblock( KBNODE keyblock )
{
KBNODE node = find_kbnode( keyblock, PKT_PUBLIC_KEY );
PKT_public_key *pk;
if( !node )
BUG();
pk = node->pkt->pkt.public_key;
if( !pk->local_id ) {
TRUSTREC rec;
get_dir_record( pk, &rec );
}
return pk->local_id;
}
/****************
* Walk through the signatures of a public key.
* The caller must provide a context structure, with all fields set
* to zero, but the local_id field set to the requested key;
* This function does not change this field. On return the context
* is filled with the local-id of the signature and the signature flag.
* No fields should be changed (clearing all fields and setting
* pubkeyid is okay to continue with an other pubkey)
* Returns: 0 - okay, -1 for eof (no more sigs) or any other errorcode
*/
static int
walk_sigrecs( SIGREC_CONTEXT *c )
{
TRUSTREC *r;
ulong rnum;
if( c->ctl.eof )
return -1;
r = &c->ctl.rec;
if( !c->ctl.init_done ) {
c->ctl.init_done = 1;
read_record( c->lid, r, 0 );
if( r->rectype != RECTYPE_DIR ) {
c->ctl.eof = 1;
return -1; /* return eof */
}
c->ctl.nextuid = r->r.dir.uidlist;
/* force a read */
c->ctl.index = SIGS_PER_RECORD;
r->r.sig.next = 0;
}
/* need a loop to skip over deleted sigs */
do {
if( c->ctl.index >= SIGS_PER_RECORD ) { /* read the record */
rnum = r->r.sig.next;
if( !rnum && c->ctl.nextuid ) { /* read next uid record */
read_record( c->ctl.nextuid, r, RECTYPE_UID );
c->ctl.nextuid = r->r.uid.next;
rnum = r->r.uid.siglist;
}
if( !rnum ) {
c->ctl.eof = 1;
return -1; /* return eof */
}
read_record( rnum, r, RECTYPE_SIG );
if( r->r.sig.lid != c->lid ) {
log_error(_("chained sigrec %lu has a wrong owner\n"), rnum );
c->ctl.eof = 1;
die_invalid_db();
}
c->ctl.index = 0;
}
} while( !r->r.sig.sig[c->ctl.index++].lid );
c->sig_lid = r->r.sig.sig[c->ctl.index-1].lid;
c->sig_flag = r->r.sig.sig[c->ctl.index-1].flag;
return 0;
}
/***********************************************
************* Trust stuff ******************
***********************************************/
/****************
* Verify that all our public keys are in the trustDB.
*/
static int
verify_own_keys()
{
int rc;
void *enum_context = NULL;
PKT_secret_key *sk = m_alloc_clear( sizeof *sk );
PKT_public_key *pk = m_alloc_clear( sizeof *pk );
u32 keyid[2];
while( !(rc=enum_secret_keys( &enum_context, sk, 0 ) ) ) {
keyid_from_sk( sk, keyid );
if( DBG_TRUST )
log_debug("key %08lX: checking secret key\n", (ulong)keyid[1] );
if( is_secret_key_protected( sk ) < 1 )
log_info(_("NOTE: secret key %08lX is NOT protected.\n"),
(ulong)keyid[1] );
/* see whether we can access the public key of this secret key */
memset( pk, 0, sizeof *pk );
rc = get_pubkey( pk, keyid );
if( rc ) {
log_info(_("key %08lX: secret key without public key - skipped\n"),
(ulong)keyid[1] );
goto skip;
}
if( cmp_public_secret_key( pk, sk ) ) {
log_info(_("key %08lX: secret and public key don't match\n"),
(ulong)keyid[1] );
goto skip;
}
/* make sure that the pubkey is in the trustdb */
rc = query_trust_record( pk );
if( rc == -1 ) { /* put it into the trustdb */
rc = insert_trust_record( pk );
if( rc ) {
log_error(_("key %08lX: can't put it into the trustdb\n"),
(ulong)keyid[1] );
goto skip;
}
}
else if( rc ) {
log_error(_("key %08lX: query record failed\n"), (ulong)keyid[1] );
goto skip;
}
if( DBG_TRUST )
log_debug("key %08lX.%lu: stored into ultikey_table\n",
(ulong)keyid[1], pk->local_id );
if( ins_lid_table_item( ultikey_table, pk->local_id, 0 ) )
log_error(_("key %08lX: already in secret key table\n"),
(ulong)keyid[1]);
else if( opt.verbose > 1 )
log_info(_("key %08lX: accepted as secret key.\n"),
(ulong)keyid[1]);
skip:
release_secret_key_parts( sk );
release_public_key_parts( pk );
}
if( rc != -1 )
log_error(_("enumerate secret keys failed: %s\n"), g10_errstr(rc) );
else
rc = 0;
enum_secret_keys( &enum_context, NULL, 0 ); /* free context */
free_secret_key( sk );
free_public_key( pk );
return rc;
}
static void
print_user_id( const char *text, u32 *keyid )
{
char *p;
size_t n;
p = get_user_id( keyid, &n );
if( *text ) {
fputs( text, stdout);
putchar(' ');
}
putchar('\"');
print_string( stdout, p, n, 0 );
putchar('\"');
putchar('\n');
m_free(p);
}
#if 0
static int
print_keyid( FILE *fp, ulong lid )
{
u32 ki[2];
if( keyid_from_lid( lid, ki ) )
return fprintf(fp, "????????.%lu", lid );
else
return fprintf(fp, "%08lX.%lu", (ulong)ki[1], lid );
}
static int
print_trust( FILE *fp, unsigned trust )
{
int c;
switch( trust ) {
case TRUST_UNKNOWN: c = 'o'; break;
case TRUST_EXPIRED: c = 'e'; break;
case TRUST_UNDEFINED: c = 'q'; break;
case TRUST_NEVER: c = 'n'; break;
case TRUST_MARGINAL: c = 'm'; break;
case TRUST_FULLY: c = 'f'; break;
case TRUST_ULTIMATE: c = 'u'; break;
default: fprintf(fp, "%02x", trust ); return 2;
}
putc(c, fp);
return 1;
}
#endif
static int
print_sigflags( FILE *fp, unsigned flags )
{
if( flags & SIGF_CHECKED ) {
fprintf(fp,"%c%c%c",
(flags & SIGF_VALID) ? 'V':'-',
(flags & SIGF_EXPIRED) ? 'E':'-',
(flags & SIGF_REVOKED) ? 'R':'-');
}
else if( flags & SIGF_NOPUBKEY)
fputs("?--", fp);
else
fputs("---", fp);
return 3;
}
/* (a non-recursive algorithm would be easier) */
static int
do_list_sigs( ulong root, ulong pk_lid, int depth,
LOCAL_ID_TABLE lids, unsigned *lineno )
{
SIGREC_CONTEXT sx;
int rc;
u32 keyid[2];
memset( &sx, 0, sizeof sx );
sx.lid = pk_lid;
for(;;) {
rc = walk_sigrecs( &sx ); /* should we replace it and use */
if( rc ) /* use a loop like in collect_paths ??*/
break;
rc = keyid_from_lid( sx.sig_lid, keyid );
if( rc ) {
printf("%6u: %*s????????.%lu:", *lineno, depth*4, "", sx.sig_lid );
print_sigflags( stdout, sx.sig_flag );
putchar('\n');
++*lineno;
}
else {
printf("%6u: %*s%08lX.%lu:", *lineno, depth*4, "",
(ulong)keyid[1], sx.sig_lid );
print_sigflags( stdout, sx.sig_flag );
putchar(' ');
/* check whether we already checked this pk_lid */
if( !qry_lid_table_flag( ultikey_table, sx.sig_lid, NULL ) ) {
print_user_id("[ultimately trusted]", keyid);
++*lineno;
}
else if( sx.sig_lid == pk_lid ) {
printf("[self-signature]\n");
++*lineno;
}
else if( sx.sig_lid == root ) {
printf("[closed]\n");
++*lineno;
}
else if( ins_lid_table_item( lids, sx.sig_lid, *lineno ) ) {
unsigned refline;
qry_lid_table_flag( lids, sx.sig_lid, &refline );
printf("[see line %u]\n", refline);
++*lineno;
}
else if( depth+1 >= MAX_LIST_SIGS_DEPTH ) {
print_user_id( "[too deeply nested]", keyid );
++*lineno;
}
else {
print_user_id( "", keyid );
++*lineno;
rc = do_list_sigs( root, sx.sig_lid, depth+1, lids, lineno );
if( rc )
break;
}
}
}
return rc==-1? 0 : rc;
}
/****************
* List all signatures of a public key
*/
static int
list_sigs( ulong pubkey_id )
{
int rc;
u32 keyid[2];
LOCAL_ID_TABLE lids;
unsigned lineno = 1;
rc = keyid_from_lid( pubkey_id, keyid );
if( rc )
return rc;
printf("Signatures of %08lX.%lu ", (ulong)keyid[1], pubkey_id );
print_user_id("", keyid);
printf("----------------------\n");
lids = new_lid_table();
rc = do_list_sigs( pubkey_id, pubkey_id, 0, lids, &lineno );
putchar('\n');
release_lid_table(lids);
return rc;
}
/****************
* List all records of a public key
*/
static int
list_records( ulong lid )
{
int rc;
TRUSTREC dr, ur, rec;
ulong recno;
rc = tdbio_read_record( lid, &dr, RECTYPE_DIR );
if( rc ) {
log_error(_("lid %lu: read dir record failed: %s\n"),
lid, g10_errstr(rc));
return rc;
}
tdbio_dump_record( &dr, stdout );
for( recno=dr.r.dir.keylist; recno; recno = rec.r.key.next ) {
rc = tdbio_read_record( recno, &rec, 0 );
if( rc ) {
log_error(_("lid %lu: read key record failed: %s\n"),
lid, g10_errstr(rc));
return rc;
}
tdbio_dump_record( &rec, stdout );
}
for( recno=dr.r.dir.uidlist; recno; recno = ur.r.uid.next ) {
rc = tdbio_read_record( recno, &ur, RECTYPE_UID );
if( rc ) {
log_error(_("lid %lu: read uid record failed: %s\n"),
lid, g10_errstr(rc));
return rc;
}
tdbio_dump_record( &ur, stdout );
/* preference records */
for(recno=ur.r.uid.prefrec; recno; recno = rec.r.pref.next ) {
rc = tdbio_read_record( recno, &rec, RECTYPE_PREF );
if( rc ) {
log_error(_("lid %lu: read pref record failed: %s\n"),
lid, g10_errstr(rc));
return rc;
}
tdbio_dump_record( &rec, stdout );
}
/* sig records */
for(recno=ur.r.uid.siglist; recno; recno = rec.r.sig.next ) {
rc = tdbio_read_record( recno, &rec, RECTYPE_SIG );
if( rc ) {
log_error(_("lid %lu: read sig record failed: %s\n"),
lid, g10_errstr(rc));
return rc;
}
tdbio_dump_record( &rec, stdout );
}
}
/* add cache record dump here */
return rc;
}
/****************
* stack is an array of (max_path+1) elements. If trust_seg_head is not
* NULL it is a pointer to a variable which will receive a linked list
* of trust paths - The caller has to free the memory.
*/
static int
collect_paths( int depth, int max_depth, int all, TRUSTREC *drec,
TRUST_INFO *stack, TRUST_SEG_LIST *trust_seg_head )
{
ulong rn, uidrn;
int marginal=0;
int fully=0;
LOCAL_ID_TABLE sigs_seen = NULL;
if( depth >= max_depth ) /* max cert_depth reached */
return TRUST_UNDEFINED;
{ int i;
for(i=0; i < depth; i++ )
if( stack[i].lid == drec->r.dir.lid )
return TRUST_UNDEFINED; /* closed (we already visited this lid) */
}
stack[depth].lid = drec->r.dir.lid;
stack[depth].otrust = drec->r.dir.ownertrust;
stack[depth].trust = 0;
if( !qry_lid_table_flag( ultikey_table, drec->r.dir.lid, NULL ) ) {
/* we are at the end of a path */
TRUST_SEG_LIST tsl;
int i;
stack[depth].trust = TRUST_ULTIMATE;
if( trust_seg_head ) {
/* we can now put copy our current stack to the trust_seg_list */
tsl = m_alloc( sizeof *tsl + (depth+1)*sizeof( TRUST_INFO ) );
for(i=0; i <= depth; i++ )
tsl->path[i] = stack[i];
tsl->pathlen = i;
tsl->next = *trust_seg_head;
*trust_seg_head = tsl;
}
return TRUST_ULTIMATE;
}
/* loop over all user-ids */
if( !all )
sigs_seen = new_lid_table();
for( rn = drec->r.dir.uidlist; rn; rn = uidrn ) {
TRUSTREC rec; /* used for uids and sigs */
ulong sigrn;
read_record( rn, &rec, RECTYPE_UID );
uidrn = rec.r.uid.next;
if( !(rec.r.uid.uidflags & UIDF_CHECKED) )
continue; /* user id has not been checked */
if( !(rec.r.uid.uidflags & UIDF_VALID) )
continue; /* user id is not valid */
if( (rec.r.uid.uidflags & UIDF_REVOKED) )
continue; /* user id has been revoked */
/* loop over all signature records */
for( rn = rec.r.uid.siglist; rn; rn = sigrn ) {
int i;
read_record( rn, &rec, RECTYPE_SIG );
sigrn = rec.r.sig.next;
for(i=0; i < SIGS_PER_RECORD; i++ ) {
TRUSTREC tmp;
int ot, nt;
if( !rec.r.sig.sig[i].lid )
continue; /* skip deleted sigs */
if( !(rec.r.sig.sig[i].flag & SIGF_CHECKED) )
continue; /* skip unchecked signatures */
if( !(rec.r.sig.sig[i].flag & SIGF_VALID) )
continue; /* skip invalid signatures */
if( (rec.r.sig.sig[i].flag & SIGF_EXPIRED) )
continue; /* skip expired signatures */
if( (rec.r.sig.sig[i].flag & SIGF_REVOKED) )
continue; /* skip revoked signatures */
/* visit every signer only once (a signer may have
* signed more than one user ID) */
if( sigs_seen && ins_lid_table_item( sigs_seen,
rec.r.sig.sig[i].lid, 0) )
continue; /* we already have this one */
read_record( rec.r.sig.sig[i].lid, &tmp, 0 );
if( tmp.rectype != RECTYPE_DIR ) {
if( tmp.rectype != RECTYPE_SDIR )
log_info("oops: lid %lu: sig %lu has rectype %d"
" - skipped\n",
drec->r.dir.lid, tmp.recnum, tmp.rectype );
continue;
}
ot = tmp.r.dir.ownertrust & TRUST_MASK;
if( ot >= TRUST_FULLY )
ot = TRUST_FULLY; /* just in case */
nt = collect_paths( depth+1, max_depth, all, &tmp, stack,
trust_seg_head );
nt &= TRUST_MASK;
if( nt < TRUST_MARGINAL ) {
continue;
}
if( nt == TRUST_ULTIMATE ) {
/* we have signed this key and only in this special case
* we assume that this one is fully trusted */
if( !all ) {
if( sigs_seen )
release_lid_table( sigs_seen );
return (stack[depth].trust = TRUST_FULLY);
}
}
if( nt >= TRUST_FULLY )
fully++;
if( nt >= TRUST_MARGINAL )
marginal++;
if( fully >= opt.completes_needed
|| marginal >= opt.marginals_needed ) {
if( !all ) {
if( sigs_seen )
release_lid_table( sigs_seen );
return (stack[depth].trust = TRUST_FULLY);
}
}
}
}
}
if( sigs_seen )
release_lid_table( sigs_seen );
if( all && ( fully >= opt.completes_needed
|| marginal >= opt.marginals_needed ) ) {
return (stack[depth].trust = TRUST_FULLY );
}
if( marginal ) {
return (stack[depth].trust = TRUST_MARGINAL);
}
return (stack[depth].trust=TRUST_UNDEFINED);
}
/****************
* Given the directory record of a key, check whether we can
* find a path to an ultimately trusted key. We do this by
* checking all key signatures up to a some depth.
*/
static int
verify_key( int max_depth, TRUSTREC *drec )
{
TRUST_INFO *tmppath = m_alloc_clear( (max_depth+1)* sizeof *tmppath );
int tr;
tr = collect_paths( 0, max_depth, 0, drec, tmppath, NULL );
m_free( tmppath );
return tr;
}
/****************
* we have the pubkey record and all needed informations are in the trustdb
* but nothing more is known.
*/
static int
do_check( TRUSTREC *dr, unsigned *validity )
{
if( !dr->r.dir.keylist ) {
log_error(_("Ooops, no keys\n"));
return G10ERR_TRUSTDB;
}
if( !dr->r.dir.uidlist ) {
log_error(_("Ooops, no user ids\n"));
return G10ERR_TRUSTDB;
}
if( tdbio_db_matches_options()
&& (dr->r.dir.dirflags & DIRF_VALVALID)
&& dr->r.dir.validity )
*validity = dr->r.dir.validity;
else {
*validity = verify_key( opt.max_cert_depth, dr );
if( (*validity & TRUST_MASK) >= TRUST_UNDEFINED
&& tdbio_db_matches_options() ) {
/* update the cached validity value */
dr->r.dir.validity = (*validity & TRUST_MASK);
dr->r.dir.dirflags |= DIRF_VALVALID;
write_record( dr );
}
}
if( dr->r.dir.dirflags & DIRF_REVOKED )
*validity |= TRUST_FLAG_REVOKED;
return 0;
}
/****************
* Perform some checks over the trustdb
* level 0: only open the db
* 1: used for initial program startup
*/
int
init_trustdb( int level, const char *dbname )
{
int rc=0;
if( !ultikey_table )
ultikey_table = new_lid_table();
if( !level || level==1 ) {
rc = tdbio_set_dbname( dbname, !!level );
if( rc )
return rc;
if( !level )
return 0;
/* verify that our own keys are in the trustDB
* or move them to the trustdb. */
rc = verify_own_keys();
/* should we check whether there is no other ultimately trusted
* key in the database? */
}
else
BUG();
return rc;
}
void
list_trustdb( const char *username )
{
TRUSTREC rec;
if( username && *username == '#' ) {
int rc;
ulong lid = atoi(username+1);
if( (rc = list_records( lid)) )
log_error(_("user '%s' read problem: %s\n"),
username, g10_errstr(rc));
else if( (rc = list_sigs( lid )) )
log_error(_("user '%s' list problem: %s\n"),
username, g10_errstr(rc));
}
else if( username ) {
PKT_public_key *pk = m_alloc_clear( sizeof *pk );
int rc;
if( (rc = get_pubkey_byname( NULL, pk, username, NULL )) )
log_error(_("user '%s' not found: %s\n"), username, g10_errstr(rc) );
else if( (rc=tdbio_search_dir_bypk( pk, &rec )) && rc != -1 )
log_error(_("problem finding '%s' in trustdb: %s\n"),
username, g10_errstr(rc));
else if( rc == -1 )
log_error(_("user '%s' not in trustdb\n"), username);
else if( (rc = list_records( pk->local_id)) )
log_error(_("user '%s' read problem: %s\n"),
username, g10_errstr(rc));
else if( (rc = list_sigs( pk->local_id )) )
log_error(_("user '%s' list problem: %s\n"),
username, g10_errstr(rc));
free_public_key( pk );
}
else {
ulong recnum;
int i;
printf("TrustDB: %s\n", tdbio_get_dbname() );
for(i=9+strlen(tdbio_get_dbname()); i > 0; i-- )
putchar('-');
putchar('\n');
for(recnum=0; !tdbio_read_record( recnum, &rec, 0); recnum++ )
tdbio_dump_record( &rec, stdout );
}
}
/****************
* Print a list of all defined owner trust value.
*/
void
export_ownertrust()
{
TRUSTREC rec;
TRUSTREC rec2;
ulong recnum;
int i;
byte *p;
int rc;
printf(_("# List of assigned trustvalues, created %s\n"
"# (Use \"gpgm --import-ownertrust\" to restore them)\n"),
asctimestamp( make_timestamp() ) );
for(recnum=0; !tdbio_read_record( recnum, &rec, 0); recnum++ ) {
if( rec.rectype == RECTYPE_DIR ) {
if( !rec.r.dir.keylist ) {
log_error(_("directory record w/o primary key\n"));
continue;
}
if( !rec.r.dir.ownertrust )
continue;
rc = tdbio_read_record( rec.r.dir.keylist, &rec2, RECTYPE_KEY);
if( rc ) {
log_error(_("error reading key record: %s\n"), g10_errstr(rc));
continue;
}
p = rec2.r.key.fingerprint;
for(i=0; i < rec2.r.key.fingerprint_len; i++, p++ )
printf("%02X", *p );
printf(":%u:\n", (unsigned)rec.r.dir.ownertrust );
}
}
}
void
import_ownertrust( const char *fname )
{
FILE *fp;
int is_stdin=0;
char line[256];
char *p;
size_t n, fprlen;
unsigned otrust;
if( !fname || (*fname == '-' && !fname[1]) ) {
fp = stdin;
fname = "[stdin]";
is_stdin = 1;
}
else if( !(fp = fopen( fname, "r" )) ) {
log_error_f(fname, _("can't open file: %s\n"), strerror(errno) );
return;
}
while( fgets( line, DIM(line)-1, fp ) ) {
TRUSTREC rec;
int rc;
if( !*line || *line == '#' )
continue;
n = strlen(line);
if( line[n-1] != '\n' ) {
log_error_f(fname, _("line to long\n") );
/* ... or last line does not have a LF */
break; /* can't continue */
}
for(p = line; *p && *p != ':' ; p++ )
if( !isxdigit(*p) )
break;
if( *p != ':' ) {
log_error_f(fname, _("error: missing colon\n") );
continue;
}
fprlen = p - line;
if( fprlen != 32 && fprlen != 40 ) {
log_error_f(fname, _("error: invalid fingerprint\n") );
continue;
}
if( sscanf(p, ":%u:", &otrust ) != 1 ) {
log_error_f(fname, _("error: no ownertrust value\n") );
continue;
}
if( !otrust )
continue; /* no otrust defined - no need to update or insert */
/* convert the ascii fingerprint to binary */
for(p=line, fprlen=0; *p != ':'; p += 2 )
line[fprlen++] = HEXTOBIN(p[0]) * 16 + HEXTOBIN(p[1]);
line[fprlen] = 0;
repeat:
rc = tdbio_search_dir_byfpr( line, fprlen, 0, &rec );
if( !rc ) { /* found: update */
if( rec.r.dir.ownertrust )
log_info(_("LID %lu: changing trust from %u to %u\n"),
rec.r.dir.lid, rec.r.dir.ownertrust, otrust );
else
log_info(_("LID %lu: setting trust to %u\n"),
rec.r.dir.lid, otrust );
rec.r.dir.ownertrust = otrust;
write_record( &rec );
}
else if( rc == -1 ) { /* not found; get the key from the ring */
PKT_public_key *pk = m_alloc_clear( sizeof *pk );
log_info_f(fname, _("key not in trustdb, searching ring.\n"));
rc = get_pubkey_byfprint( pk, line, fprlen );
if( rc )
log_info_f(fname, _("key not in ring: %s\n"), g10_errstr(rc));
else {
rc = query_trust_record( pk ); /* only as assertion */
if( rc != -1 )
log_error_f(fname, _("Oops: key is now in trustdb???\n"));
else {
rc = insert_trust_record( pk );
if( !rc )
goto repeat; /* update the ownertrust */
log_error_f(fname, _("insert trust record failed: %s\n"),
g10_errstr(rc) );
}
}
}
else /* error */
log_error_f(fname, _("error finding dir record: %s\n"),
g10_errstr(rc));
}
if( ferror(fp) )
log_error_f(fname, _("read error: %s\n"), strerror(errno) );
if( !is_stdin )
fclose(fp);
do_sync();
}
static void
print_path( int pathlen, TRUST_INFO *path )
{
int rc, i;
u32 keyid[2];
fputs("path:", stdout);
for( i = 0; i < pathlen; i++ ) {
if( i && !(i%4) )
fputs(" ", stdout );
rc = keyid_from_lid( path[i].lid, keyid );
if( rc )
printf(" ????????.%lu:", path[i].lid );
else
printf(" %08lX.%lu:", (ulong)keyid[1], path[i].lid );
print_sigflags( stdout, path[i].otrust );
}
putchar('\n');
}
void
list_trust_path( int max_depth, const char *username )
{
int rc;
int wipe=0;
TRUSTREC rec;
TRUST_INFO *tmppath;
TRUST_SEG_LIST trust_seg_list, tsl, tsl2;
PKT_public_key *pk = m_alloc_clear( sizeof *pk );
if( max_depth < 0 ) {
wipe = 1;
max_depth = -max_depth;
}
if( (rc = get_pubkey_byname(NULL, pk, username, NULL )) )
log_error(_("user '%s' not found: %s\n"), username, g10_errstr(rc) );
else if( (rc=tdbio_search_dir_bypk( pk, &rec )) && rc != -1 )
log_error(_("problem finding '%s' in trustdb: %s\n"),
username, g10_errstr(rc));
else if( rc == -1 ) {
log_info(_("user '%s' not in trustdb - inserting\n"), username);
rc = insert_trust_record( pk );
if( rc )
log_error(_("failed to put '%s' into trustdb: %s\n"),
username, g10_errstr(rc));
else {
assert( pk->local_id );
}
}
free_public_key( pk );
/* collect the paths */
tmppath = m_alloc_clear( (max_depth+1)* sizeof *tmppath );
trust_seg_list = NULL;
collect_paths( 0, max_depth, 1, &rec, tmppath, &trust_seg_list );
m_free( tmppath );
/* and now print them */
for(tsl = trust_seg_list; tsl; tsl = tsl->next ) {
print_path( tsl->pathlen, tsl->path );
}
/* release the list */
for(tsl = trust_seg_list; tsl; tsl = tsl2 ) {
tsl2 = tsl->next;
m_free( tsl );
}
trust_seg_list = NULL;
}
/****************
* Check the complete trustdb or only the entries for the given username.
* We check the complete database and recalculate all flags.
*/
void
check_trustdb( const char *username )
{
TRUSTREC rec;
KBNODE keyblock = NULL;
KBPOS kbpos;
int rc;
if( username ) {
rc = find_keyblock_byname( &kbpos, username );
if( !rc )
rc = read_keyblock( &kbpos, &keyblock );
if( rc ) {
log_error(_("%s: keyblock read problem: %s\n"),
username, g10_errstr(rc));
}
else {
int modified;
rc = update_trust_record( keyblock, 0, &modified );
if( rc == -1 ) { /* not yet in trustdb: insert */
rc = insert_trust_record(
find_kbnode( keyblock, PKT_PUBLIC_KEY
) ->pkt->pkt.public_key );
}
if( rc )
log_error(_("%s: update failed: %s\n"),
username, g10_errstr(rc) );
else if( modified )
log_info(_("%s: updated\n"), username );
else
log_info(_("%s: okay\n"), username );
}
release_kbnode( keyblock ); keyblock = NULL;
}
else {
ulong recnum;
ulong count=0, upd_count=0, err_count=0, skip_count=0;
for(recnum=0; !tdbio_read_record( recnum, &rec, 0); recnum++ ) {
if( rec.rectype == RECTYPE_DIR ) {
TRUSTREC tmp;
int modified;
if( !rec.r.dir.keylist ) {
log_info(_("lid %lu: dir record w/o key - skipped\n"),
recnum);
count++;
skip_count++;
continue;
}
read_record( rec.r.dir.keylist, &tmp, RECTYPE_KEY );
rc = get_keyblock_byfprint( &keyblock,
tmp.r.key.fingerprint,
tmp.r.key.fingerprint_len );
if( rc ) {
log_error(_("lid %lu: keyblock not found: %s\n"),
recnum, g10_errstr(rc) );
count++;
skip_count++;
continue;
}
rc = update_trust_record( keyblock, 0, &modified );
if( rc ) {
log_error(_("lid %lu: update failed: %s\n"),
recnum, g10_errstr(rc) );
err_count++;
}
else if( modified ) {
if( opt.verbose )
log_info(_("lid %lu: updated\n"), recnum );
upd_count++;
}
else if( opt.verbose > 1 )
log_info(_("lid %lu: okay\n"), recnum );
release_kbnode( keyblock ); keyblock = NULL;
if( !(++count % 100) )
log_info(_("%lu keys so far processed\n"), count);
}
}
log_info(_("%lu keys processed\n"), count);
if( skip_count )
log_info(_("\t%lu keys skipped\n"), skip_count);
if( err_count )
log_info(_("\t%lu keys with errors\n"), err_count);
if( upd_count )
log_info(_("\t%lu keys updated\n"), upd_count);
}
}
/****************
* Put new entries from the pubrings into the trustdb.
* This function honors the sig flags to speed up the check.
*/
void
update_trustdb( )
{
KBNODE keyblock = NULL;
KBPOS kbpos;
int rc;
rc = enum_keyblocks( 0, &kbpos, &keyblock );
if( !rc ) {
ulong count=0, upd_count=0, err_count=0, new_count=0;
while( !(rc = enum_keyblocks( 1, &kbpos, &keyblock )) ) {
int modified;
rc = update_trust_record( keyblock, 1, &modified );
if( rc == -1 ) { /* not yet in trustdb: insert */
PKT_public_key *pk =
find_kbnode( keyblock, PKT_PUBLIC_KEY
) ->pkt->pkt.public_key;
rc = insert_trust_record( pk );
if( rc && !pk->local_id ) {
log_error(_("lid ?: insert failed: %s\n"),
g10_errstr(rc) );
err_count++;
}
else if( rc ) {
log_error(_("lid %lu: insert failed: %s\n"),
pk->local_id, g10_errstr(rc) );
err_count++;
}
else {
if( opt.verbose )
log_info(_("lid %lu: inserted\n"), pk->local_id );
new_count++;
}
}
else if( rc ) {
log_error(_("lid %lu: update failed: %s\n"),
lid_from_keyblock(keyblock), g10_errstr(rc) );
err_count++;
}
else if( modified ) {
if( opt.verbose )
log_info(_("lid %lu: updated\n"), lid_from_keyblock(keyblock));
upd_count++;
}
else if( opt.verbose > 1 )
log_info(_("lid %lu: okay\n"), lid_from_keyblock(keyblock) );
release_kbnode( keyblock ); keyblock = NULL;
if( !(++count % 100) )
log_info(_("%lu keys so far processed\n"), count);
}
log_info(_("%lu keys processed\n"), count);
if( err_count )
log_info(_("\t%lu keys with errors\n"), err_count);
if( upd_count )
log_info(_("\t%lu keys updated\n"), upd_count);
if( new_count )
log_info(_("\t%lu keys inserted\n"), new_count);
}
if( rc && rc != -1 )
log_error(_("enumerate keyblocks failed: %s\n"), g10_errstr(rc));
enum_keyblocks( 2, &kbpos, &keyblock ); /* close */
release_kbnode( keyblock );
}
/****************
* Get the trustlevel for this PK.
* Note: This does not ask any questions
* Returns: 0 okay of an errorcode
*
* It operates this way:
* locate the pk in the trustdb
* found:
* Do we have a valid cache record for it?
* yes: return trustlevel from cache
* no: make a cache record and all the other stuff
* not found:
* try to insert the pubkey into the trustdb and check again
*
* Problems: How do we get the complete keyblock to check that the
* cache record is actually valid? Think we need a clever
* cache in getkey.c to keep track of this stuff. Maybe it
* is not necessary to check this if we use a local pubring. Hmmmm.
*/
int
check_trust( PKT_public_key *pk, unsigned *r_trustlevel )
{
TRUSTREC rec;
unsigned trustlevel = TRUST_UNKNOWN;
int rc=0;
u32 cur_time;
u32 keyid[2];
keyid_from_pk( pk, keyid );
/* get the pubkey record */
if( pk->local_id ) {
read_record( pk->local_id, &rec, RECTYPE_DIR );
}
else { /* no local_id: scan the trustdb */
if( (rc=tdbio_search_dir_bypk( pk, &rec )) && rc != -1 ) {
log_error(_("check_trust: search dir record failed: %s\n"),
g10_errstr(rc));
return rc;
}
else if( rc == -1 ) { /* not found - insert */
rc = insert_trust_record( pk );
if( rc ) {
log_error(_("key %08lX: insert trust record failed: %s\n"),
(ulong)keyid[1], g10_errstr(rc));
goto leave;
}
log_info(_("key %08lX.%lu: inserted into trustdb\n"),
(ulong)keyid[1], pk->local_id );
/* and re-read the dir record */
read_record( pk->local_id, &rec, RECTYPE_DIR );
}
}
cur_time = make_timestamp();
if( pk->timestamp > cur_time ) {
log_info(_("key %08lX.%lu: created in future "
"(time warp or clock problem)\n"),
(ulong)keyid[1], pk->local_id );
return G10ERR_TIME_CONFLICT;
}
if( pk->expiredate && pk->expiredate <= cur_time ) {
log_info(_("key %08lX.%lu: expired at %s\n"),
(ulong)keyid[1], pk->local_id,
asctimestamp( pk->expiredate) );
trustlevel = TRUST_EXPIRED;
}
else {
rc = do_check( &rec, &trustlevel );
if( rc ) {
log_error(_("key %08lX.%lu: trust check failed: %s\n"),
(ulong)keyid[1], pk->local_id, g10_errstr(rc));
return rc;
}
}
leave:
if( DBG_TRUST )
log_debug("check_trust() returns trustlevel %04x.\n", trustlevel);
*r_trustlevel = trustlevel;
return 0;
}
int
query_trust_info( PKT_public_key *pk )
{
unsigned trustlevel;
int c;
if( check_trust( pk, &trustlevel ) )
return '?';
if( trustlevel & TRUST_FLAG_REVOKED )
return 'r';
switch( (trustlevel & TRUST_MASK) ) {
case TRUST_UNKNOWN: c = 'o'; break;
case TRUST_EXPIRED: c = 'e'; break;
case TRUST_UNDEFINED: c = 'q'; break;
case TRUST_NEVER: c = 'n'; break;
case TRUST_MARGINAL: c = 'm'; break;
case TRUST_FULLY: c = 'f'; break;
case TRUST_ULTIMATE: c = 'u'; break;
default: BUG();
}
return c;
}
/****************
* Enumerate all keys, which are needed to build all trust paths for
* the given key. This function does not return the key itself or
* the ultimate key (the last point in cerificate chain). Only
* certificate chains which ends up at an ultimately trusted key
* are listed. If ownertrust or validity is not NULL, the corresponding
* value for the returned LID is also returned in these variable(s).
*
* 1) create a void pointer and initialize it to NULL
* 2) pass this void pointer by reference to this function.
* Set lid to the key you want to enumerate and pass it by reference.
* 3) call this function as long as it does not return -1
* to indicate EOF. LID does contain the next key used to build the web
* 4) Always call this function a last time with LID set to NULL,
* so that it can free its context.
*
* Returns: -1 on EOF or the level of the returned LID
*/
int
enum_cert_paths( void **context, ulong *lid,
unsigned *ownertrust, unsigned *validity )
{
struct {
int init;
TRUST_SEG_LIST tsl_head;
TRUST_SEG_LIST tsl;
int idx;
} *ctx;
TRUST_SEG_LIST tsl;
if( !lid ) { /* release the context */
if( *context ) {
TRUST_SEG_LIST tsl2;
ctx = *context;
for(tsl = ctx->tsl_head; tsl; tsl = tsl2 ) {
tsl2 = tsl->next;
m_free( tsl );
}
*context = NULL;
}
return -1;
}
if( !*context ) {
TRUST_INFO *tmppath;
TRUSTREC rec;
if( !lid )
return -1;
ctx = m_alloc_clear( sizeof *ctx );
*context = ctx;
/* collect the paths */
read_record( *lid, &rec, RECTYPE_DIR );
tmppath = m_alloc_clear( (opt.max_cert_depth+1)* sizeof *tmppath );
tsl = NULL;
collect_paths( 0, opt.max_cert_depth, 1, &rec, tmppath, &tsl );
m_free( tmppath );
/* and now print them */
ctx->tsl_head = tsl;
ctx->tsl = ctx->tsl_head;
ctx->idx = 0;
}
else
ctx = *context;
while( ctx->tsl && ctx->idx >= tsl->pathlen ) {
ctx->tsl = ctx->tsl->next;
ctx->idx = 0;
}
tsl = ctx->tsl;
if( !tsl )
return -1; /* eof */
if( ownertrust )
*ownertrust = tsl->path[ctx->idx].otrust;
if( validity )
*validity = tsl->path[ctx->idx].trust;
*lid = tsl->path[ctx->idx].lid;
ctx->idx++;
return ctx->idx-1;
}
/****************
* Return the assigned ownertrust value for the given LID
*/
unsigned
get_ownertrust( ulong lid )
{
TRUSTREC rec;
read_record( lid, &rec, RECTYPE_DIR );
return rec.r.dir.ownertrust;
}
int
get_ownertrust_info( ulong lid )
{
unsigned otrust;
int c;
otrust = get_ownertrust( lid );
switch( (otrust & TRUST_MASK) ) {
case TRUST_NEVER: c = 'n'; break;
case TRUST_MARGINAL: c = 'm'; break;
case TRUST_FULLY: c = 'f'; break;
case TRUST_ULTIMATE: c = 'u'; break;
default: c = '-'; break;
}
return c;
}
byte *
get_pref_data( ulong lid, const byte *namehash, size_t *ret_n )
{
TRUSTREC rec;
ulong recno;
read_record( lid, &rec, RECTYPE_DIR );
for( recno=rec.r.dir.uidlist; recno; recno = rec.r.uid.next ) {
read_record( recno, &rec, RECTYPE_UID );
if( rec.r.uid.prefrec
&& ( !namehash || !memcmp(namehash, rec.r.uid.namehash, 20) )) {
byte *buf;
/* found the correct one or the first one */
read_record( rec.r.uid.prefrec, &rec, RECTYPE_PREF );
if( rec.r.pref.next )
log_info(_("WARNING: can't yet handle long pref records\n"));
buf = m_alloc( ITEMS_PER_PREF_RECORD );
memcpy( buf, rec.r.pref.data, ITEMS_PER_PREF_RECORD );
*ret_n = ITEMS_PER_PREF_RECORD;
return buf;
}
}
return NULL;
}
/****************
* Check whether the algorithm is in one of the pref records
*/
int
is_algo_in_prefs( ulong lid, int preftype, int algo )
{
TRUSTREC rec;
ulong recno;
int i;
byte *pref;
read_record( lid, &rec, RECTYPE_DIR );
for( recno=rec.r.dir.uidlist; recno; recno = rec.r.uid.next ) {
read_record( recno, &rec, RECTYPE_UID );
if( rec.r.uid.prefrec ) {
read_record( rec.r.uid.prefrec, &rec, RECTYPE_PREF );
if( rec.r.pref.next )
log_info(_("WARNING: can't yet handle long pref records\n"));
pref = rec.r.pref.data;
for(i=0; i+1 < ITEMS_PER_PREF_RECORD; i+=2 ) {
if( pref[i] == preftype && pref[i+1] == algo )
return 1;
}
}
}
return 0;
}
static int
get_dir_record( PKT_public_key *pk, TRUSTREC *rec )
{
int rc=0;
if( pk->local_id ) {
read_record( pk->local_id, rec, RECTYPE_DIR );
}
else { /* no local_id: scan the trustdb */
if( (rc=tdbio_search_dir_bypk( pk, rec )) && rc != -1 )
log_error(_("get_dir_record: search_record failed: %s\n"),
g10_errstr(rc));
}
return rc;
}
/****************
* This function simply looks for the key in the trustdb
* and makes sure that pk->local_id is set to the coreect value.
* Return: 0 = found
* -1 = not found
* other = error
*/
int
query_trust_record( PKT_public_key *pk )
{
TRUSTREC rec;
return get_dir_record( pk, &rec );
}
int
clear_trust_checked_flag( PKT_public_key *pk )
{
TRUSTREC rec;
int rc;
rc = get_dir_record( pk, &rec );
if( rc )
return rc;
/* check whether they are already reset */
if( !(rec.r.dir.dirflags & DIRF_CHECKED)
&& !(rec.r.dir.dirflags & DIRF_VALVALID) )
return 0;
/* reset the flag */
rec.r.dir.dirflags &= ~DIRF_CHECKED;
rec.r.dir.dirflags &= ~DIRF_VALVALID;
write_record( &rec );
do_sync();
return 0;
}
static void
check_hint_sig( ulong lid, KBNODE keyblock, u32 *keyid, byte *uidrec_hash,
TRUSTREC *sigrec, int sigidx, ulong hint_owner )
{
KBNODE node;
int rc, state;
byte uhash[20];
int is_selfsig;
PKT_signature *sigpkt = NULL;
TRUSTREC tmp;
u32 sigkid[2];
int revoke = 0;
if( sigrec->r.sig.sig[sigidx].flag & SIGF_CHECKED )
log_info(_("NOTE: sig rec %lu[%d] in hintlist "
"of %lu but marked as checked\n"),
sigrec->recnum, sigidx, hint_owner );
if( !(sigrec->r.sig.sig[sigidx].flag & SIGF_NOPUBKEY) )
log_info(_("NOTE: sig rec %lu[%d] in hintlist "
"of %lu but not marked\n"),
sigrec->recnum, sigidx, hint_owner );
read_record( sigrec->r.sig.sig[sigidx].lid, &tmp, 0 );
if( tmp.rectype != RECTYPE_DIR ) {
/* we need the dir record */
log_error(_("sig rec %lu[%d] in hintlist "
"of %lu does not point to a dir record\n"),
sigrec->recnum, sigidx, hint_owner );
return;
}
if( !tmp.r.dir.keylist ) {
log_error(_("lid %lu: no primary key\n"), tmp.r.dir.lid );
return;
}
read_record(tmp.r.dir.keylist, &tmp, RECTYPE_KEY );
keyid_from_fingerprint( tmp.r.key.fingerprint,
tmp.r.key.fingerprint_len, sigkid );
/* find the correct signature packet */
state = 0;
for( node=keyblock; node; node = node->next ) {
if( node->pkt->pkttype == PKT_USER_ID ) {
PKT_user_id *uidpkt = node->pkt->pkt.user_id;
if( state )
break;
rmd160_hash_buffer( uhash, uidpkt->name, uidpkt->len );
if( !memcmp( uhash, uidrec_hash, 20 ) )
state = 1;
}
else if( state && node->pkt->pkttype == PKT_SIGNATURE ) {
sigpkt = node->pkt->pkt.signature;
if( sigpkt->keyid[0] == sigkid[0]
&& sigpkt->keyid[1] == sigkid[1]
&& ( (sigpkt->sig_class&~3) == 0x10
|| ( revoke = (sigpkt->sig_class == 0x30)) ) ) {
state = 2;
break; /* found */
}
}
}
if( !node ) {
log_info(_("lid %lu: user id not found in keyblock\n"), lid );
return ;
}
if( state != 2 ) {
log_info(_("lid %lu: user id without signature\n"), lid );
return ;
}
/* and check the sig */
rc = check_key_signature( keyblock, node, &is_selfsig );
if( is_selfsig ) {
log_error(_("lid %lu: self-signature in hintlist\n"), lid );
return;
}
/* FiXME: handling fo SIGF_REVOKED is not correct! */
if( !rc ) { /* valid signature */
if( opt.verbose )
log_info("sig %08lX.%lu/%02X%02X/%08lX: %s\n",
(ulong)keyid[1], lid, uhash[18], uhash[19],
(ulong)sigpkt->keyid[1],
revoke? _("Valid certificate revocation")
: _("Good certificate") );
sigrec->r.sig.sig[sigidx].flag = SIGF_CHECKED | SIGF_VALID;
if( revoke )
sigrec->r.sig.sig[sigidx].flag |= SIGF_REVOKED;
}
else if( rc == G10ERR_NO_PUBKEY ) {
log_info("sig %08lX.%lu/%02X%02X/%08lX: %s\n",
(ulong)keyid[1], lid, uhash[18], uhash[19],
(ulong)sigpkt->keyid[1],
_("very strange: no public key\n") );
sigrec->r.sig.sig[sigidx].flag = SIGF_NOPUBKEY;
}
else {
log_info("sig %08lX.%lu/%02X%02X/%08lX: %s\n",
(ulong)keyid[1], lid, uhash[18], uhash[19],
(ulong)sigpkt->keyid[1], g10_errstr(rc) );
sigrec->r.sig.sig[sigidx].flag = SIGF_CHECKED;
}
sigrec->dirty = 1;
}
/****************
* Process a hintlist.
* Fixme: this list is not anymore anchored to another
* record, so it should be put elsewehere in case of an error
*/
static void
process_hintlist( ulong hintlist, ulong hint_owner )
{
ulong hlst_rn;
int rc;
for( hlst_rn = hintlist; hlst_rn; ) {
TRUSTREC hlstrec;
int hlst_idx;
read_record( hlst_rn, &hlstrec, RECTYPE_HLST );
for( hlst_idx=0; hlst_idx < ITEMS_PER_HLST_RECORD; hlst_idx++ ) {
TRUSTREC dirrec;
TRUSTREC uidrec;
TRUSTREC tmprec;
KBNODE keyblock = NULL;
u32 keyid[2];
ulong lid;
ulong r1, r2;
lid = hlstrec.r.hlst.rnum[hlst_idx];
if( !lid )
continue;
read_record( lid, &dirrec, 0 );
/* make sure it points to a dir record:
* this should be true because it only makes sense to
* call this function if the dir record is available */
if( dirrec.rectype != RECTYPE_DIR ) {
log_error(_("hintlist %lu[%d] of %lu "
"does not point to a dir record\n"),
hlst_rn, hlst_idx, hint_owner );
continue;
}
if( !dirrec.r.dir.keylist ) {
log_error(_("lid %lu does not have a key\n"), lid );
continue;
}
/* get the keyblock */
read_record( dirrec.r.dir.keylist, &tmprec, RECTYPE_KEY );
rc = get_keyblock_byfprint( &keyblock,
tmprec.r.key.fingerprint,
tmprec.r.key.fingerprint_len );
if( rc ) {
log_error(_("lid %lu: can't get keyblock: %s\n"),
lid, g10_errstr(rc) );
continue;
}
keyid_from_fingerprint( tmprec.r.key.fingerprint,
tmprec.r.key.fingerprint_len, keyid );
/* Walk over all user ids and their signatures and check all
* the signature which are created by hint_owner */
for( r1 = dirrec.r.dir.uidlist; r1; r1 = uidrec.r.uid.next ) {
TRUSTREC sigrec;
read_record( r1, &uidrec, RECTYPE_UID );
for( r2 = uidrec.r.uid.siglist; r2; r2 = sigrec.r.sig.next ) {
int i;
read_record( r2, &sigrec, RECTYPE_SIG );
sigrec.dirty = 0;
for(i=0; i < SIGS_PER_RECORD; i++ ) {
if( !sigrec.r.sig.sig[i].lid )
continue; /* skip deleted sigs */
if( sigrec.r.sig.sig[i].lid != hint_owner )
continue; /* not for us */
/* some diagnostic messages */
/* and do the signature check */
check_hint_sig( lid, keyblock, keyid,
uidrec.r.uid.namehash,
&sigrec, i, hint_owner );
}
if( sigrec.dirty )
write_record( &sigrec );
}
}
release_kbnode( keyblock );
} /* loop over hlst entries */
/* delete this hlst record */
hlst_rn = hlstrec.r.hlst.next;
delete_record( hlstrec.recnum );
} /* loop over hintlist */
}
/****************
* Create or update shadow dir record and return the LID of the record
*/
static ulong
create_shadow_dir( PKT_signature *sig, ulong lid )
{
TRUSTREC sdir, hlst, tmphlst;
ulong recno, newlid;
int tmpidx=0; /* avoids gcc warnign - this is controlled by tmphlst */
int rc;
/* first see whether we already have such a record */
rc = tdbio_search_sdir( sig->keyid, sig->pubkey_algo, &sdir );
if( rc && rc != -1 ) {
log_error(_("tdbio_search_dir failed: %s\n"), g10_errstr(rc));
die_invalid_db();
}
if( rc == -1 ) { /* not found: create */
memset( &sdir, 0, sizeof sdir );
sdir.recnum = tdbio_new_recnum();
sdir.rectype= RECTYPE_SDIR;
sdir.r.sdir.lid = sdir.recnum;
sdir.r.sdir.keyid[0] = sig->keyid[0];
sdir.r.sdir.keyid[1] = sig->keyid[1];
sdir.r.sdir.pubkey_algo = sig->pubkey_algo;
sdir.r.sdir.hintlist = 0;
write_record( &sdir );
}
newlid = sdir.recnum;
/* Put the record number into the hintlist.
* (It is easier to use the lid and not the record number of the
* key to save some space (assuming that a signator has
* signed more than one user id - and it is easier to implement.)
*/
tmphlst.recnum = 0;
for( recno=sdir.r.sdir.hintlist; recno; recno = hlst.r.hlst.next) {
int i;
read_record( recno, &hlst, RECTYPE_HLST );
for( i=0; i < ITEMS_PER_HLST_RECORD; i++ ) {
if( !hlst.r.hlst.rnum[i] ) {
if( !tmphlst.recnum ) {
tmphlst = hlst;
tmpidx = i;
}
}
else if( hlst.r.hlst.rnum[i] == lid )
return newlid; /* the signature is already in the hintlist */
}
}
/* not yet in the hint list, write it */
if( tmphlst.recnum ) { /* we have an empty slot */
tmphlst.r.hlst.rnum[tmpidx] = lid;
write_record( &tmphlst );
}
else { /* must append a new hlst record */
memset( &hlst, 0, sizeof hlst );
hlst.recnum = tdbio_new_recnum();
hlst.rectype = RECTYPE_HLST;
hlst.r.hlst.next = sdir.r.sdir.hintlist;
hlst.r.hlst.rnum[0] = lid;
write_record( &hlst );
sdir.r.sdir.hintlist = hlst.recnum;
write_record( &sdir );
}
return newlid;
}
/****************
* This function checks the given public key and inserts or updates
* the keyrecord from the trustdb. Revocation certificates
* are handled here and the keybinding of subkeys is checked.
* Hmmm: Should we check here, that the key has at least one valid
* user ID or do we allow keys w/o user ID?
*
* keyblock points to the first node in the keyblock,
* keynode is the node with the public key to check
* (either primary or secondary), keyid is the keyid of
* the primary key, drec is the directory record and recno_list
* is a list used to keep track of visited records.
* Existing keyflags are recalculated if recheck is true.
*/
static void
upd_key_record( KBNODE keyblock, KBNODE keynode, u32 *keyid,
TRUSTREC *drec, RECNO_LIST *recno_list, int recheck )
{
TRUSTREC krec;
KBNODE node;
PKT_public_key *pk = keynode->pkt->pkt.public_key;
ulong lid = drec->recnum;
byte fpr[MAX_FINGERPRINT_LEN];
size_t fprlen;
ulong recno, newrecno;
int keybind_seen = 0;
int revoke_seen = 0;
int rc;
fingerprint_from_pk( pk, fpr, &fprlen );
/* do we already have this key? */
for( recno=drec->r.dir.keylist; recno; recno = krec.r.key.next ) {
read_record( recno, &krec, RECTYPE_KEY );
if( krec.r.key.fingerprint_len == fprlen
&& !memcmp( krec.r.key.fingerprint, fpr, fprlen ) )
break;
}
if( recno ) { /* yes */
ins_recno_list( recno_list, recno, RECTYPE_KEY );
}
else { /* no: insert this new key */
recheck = 1;
memset( &krec, 0, sizeof(krec) );
krec.rectype = RECTYPE_KEY;
krec.r.key.lid = lid;
krec.r.key.pubkey_algo = pk->pubkey_algo;
krec.r.key.fingerprint_len = fprlen;
memcpy(krec.r.key.fingerprint, fpr, fprlen );
krec.recnum = newrecno = tdbio_new_recnum();
write_record( &krec );
ins_recno_list( recno_list, newrecno, RECTYPE_KEY );
/* and put this new record at the end of the keylist */
if( !(recno=drec->r.dir.keylist) ) {
/* this is the first key */
drec->r.dir.keylist = newrecno;
drec->dirty = 1;
}
else { /* we already have a key, append the new one */
TRUSTREC save = krec;
for( ; recno; recno = krec.r.key.next )
read_record( recno, &krec, RECTYPE_KEY );
krec.r.key.next = newrecno;
write_record( &krec );
krec = save;
}
}
if( !recheck && (krec.r.key.keyflags & KEYF_CHECKED) )
return;
/* check keybindings and revocations */
krec.r.key.keyflags = 0;
if( keynode->pkt->pkttype == PKT_PUBLIC_KEY ) {
/* we assume that a primary key is always valid
* and check later whether we have a revocation */
krec.r.key.keyflags |= KEYF_CHECKED | KEYF_VALID;
}
for( node=keynode->next; node; node = node->next ) {
PKT_signature *sig;
if( node->pkt->pkttype == PKT_PUBLIC_SUBKEY )
break; /* ready */
else if( node->pkt->pkttype != PKT_SIGNATURE )
continue;
sig = node->pkt->pkt.signature;
if( keyid[0] != sig->keyid[0] || keyid[1] != sig->keyid[1] )
continue; /* not a self signature */
if( sig->sig_class == 0x18 && !keybind_seen ) { /* a keybinding */
if( keynode->pkt->pkttype == PKT_PUBLIC_KEY )
continue; /* oops, not for a main key */
/* we check until we find a valid keybinding */
rc = check_key_signature( keyblock, node, NULL );
if( !rc ) {
if( opt.verbose )
log_info(_(
"key %08lX.%lu: Good subkey binding\n"),
(ulong)keyid_from_pk(pk,NULL), lid );
krec.r.key.keyflags |= KEYF_CHECKED | KEYF_VALID;
}
else {
log_info(_(
"key %08lX.%lu: Invalid subkey binding: %s\n"),
(ulong)keyid_from_pk(pk,NULL), lid, g10_errstr(rc) );
krec.r.key.keyflags |= KEYF_CHECKED;
krec.r.key.keyflags &= ~KEYF_VALID;
}
keybind_seen = 1;
}
else if( sig->sig_class == 0x20 && !revoke_seen ) {
if( keynode->pkt->pkttype == PKT_PUBLIC_SUBKEY )
continue; /* a subkey is not expected here */
/* This is a key revocation certificate: check it */
rc = check_key_signature( keyblock, node, NULL );
if( !rc ) {
if( opt.verbose )
log_info(_(
"key %08lX.%lu: Valid key revocation\n"),
(ulong)keyid_from_pk(pk,NULL), lid );
krec.r.key.keyflags |= KEYF_REVOKED;
}
else {
log_info(_(
"key %08lX.%lu: Invalid key revocation: %s\n"),
(ulong)keyid_from_pk(pk,NULL), lid, g10_errstr(rc) );
}
revoke_seen = 1;
}
else if( sig->sig_class == 0x28 && !revoke_seen ) {
if( keynode->pkt->pkttype == PKT_PUBLIC_KEY )
continue; /* a mainkey is not expected here */
/* This is a subkey revocation certificate: check it */
/* fixme: we should also check the revocation
* is newer than the key (OpenPGP) */
rc = check_key_signature( keyblock, node, NULL );
if( !rc ) {
if( opt.verbose )
log_info(_(
"key %08lX.%lu: Valid subkey revocation\n"),
(ulong)keyid_from_pk(pk,NULL), lid );
krec.r.key.keyflags |= KEYF_REVOKED;
}
else {
log_info(_(
"key %08lX.%lu: Invalid subkey binding: %s\n"),
(ulong)keyid_from_pk(pk,NULL), lid, g10_errstr(rc) );
}
revoke_seen = 1;
}
}
write_record( &krec );
}
/****************
* This function checks the given user ID and inserts or updates
* the uid record of the trustdb. Revocation certificates
* are handled here.
*
* keyblock points to the first node in the keyblock,
* uidnode is the node with the user id to check
* keyid is the keyid of
* the primary key, drec is the directory record and recno_list
* is a list used to keep track of visited records.
* Existing uidflags are recalculated if recheck is true.
*/
static void
upd_uid_record( KBNODE keyblock, KBNODE uidnode, u32 *keyid,
TRUSTREC *drec, RECNO_LIST *recno_list, int recheck )
{
ulong lid = drec->recnum;
PKT_user_id *uid = uidnode->pkt->pkt.user_id;
TRUSTREC urec;
PKT_signature *selfsig = NULL;
byte uidhash[20];
KBNODE node;
ulong recno, newrecno;
int rc;
/* see whether we already have an uid record */
rmd160_hash_buffer( uidhash, uid->name, uid->len );
for( recno=drec->r.dir.uidlist; recno; recno = urec.r.uid.next ) {
read_record( recno, &urec, RECTYPE_UID );
if( !memcmp( uidhash, urec.r.uid.namehash, 20 ) )
break;
}
if( recno ) { /* we already have this record */
ins_recno_list( recno_list, recno, RECTYPE_UID );
}
else { /* new user id */
recheck = 1;
memset( &urec, 0 , sizeof(urec) );
urec.rectype = RECTYPE_UID;
urec.r.uid.lid = drec->recnum;
memcpy(urec.r.uid.namehash, uidhash, 20 );
urec.recnum = newrecno = tdbio_new_recnum();
write_record( &urec );
ins_recno_list( recno_list, newrecno, RECTYPE_UID );
/* and put this new record at the end of the uidlist */
if( !(recno=drec->r.dir.uidlist) ) { /* this is the first uid */
drec->r.dir.uidlist = newrecno;
drec->dirty = 1;
}
else { /* we already have an uid, append it to the list */
TRUSTREC save = urec;
for( ; recno; recno = urec.r.key.next )
read_record( recno, &urec, RECTYPE_UID );
urec.r.uid.next = newrecno;
write_record( &urec );
urec = save;
}
}
if( recheck || !(urec.r.uid.uidflags & UIDF_CHECKED) ) {
/* check self signatures */
urec.r.uid.uidflags = 0;
for( node=uidnode->next; node; node = node->next ) {
PKT_signature *sig;
if( node->pkt->pkttype == PKT_USER_ID )
break; /* ready */
if( node->pkt->pkttype == PKT_PUBLIC_SUBKEY )
break; /* ready */
if( node->pkt->pkttype != PKT_SIGNATURE )
continue;
sig = node->pkt->pkt.signature;
if( keyid[0] != sig->keyid[0] || keyid[1] != sig->keyid[1] )
continue; /* not a self signature */
if( (sig->sig_class&~3) == 0x10 ) { /* regular self signature */
rc = check_key_signature( keyblock, node, NULL );
if( !rc ) {
if( opt.verbose )
log_info( "uid %08lX.%lu/%02X%02X: %s\n",
(ulong)keyid[1], lid, uidhash[18], uidhash[19],
_("Good self-signature") );
urec.r.uid.uidflags |= UIDF_CHECKED | UIDF_VALID;
if( !selfsig )
selfsig = sig; /* use the first valid sig */
}
else {
log_info( "uid %08lX/%02X%02X: %s: %s\n",
(ulong)keyid[1], uidhash[18], uidhash[19],
_("Invalid self-signature"),
g10_errstr(rc) );
urec.r.uid.uidflags |= UIDF_CHECKED;
}
}
else if( sig->sig_class == 0x30 ) { /* cert revocation */
rc = check_key_signature( keyblock, node, NULL );
if( !rc ) {
if( opt.verbose )
log_info( "uid %08lX.%lu/%02X%02X: %s\n",
(ulong)keyid[1], lid, uidhash[18], uidhash[19],
_("Valid user ID revocation\n") );
urec.r.uid.uidflags |= UIDF_CHECKED | UIDF_VALID;
urec.r.uid.uidflags |= UIDF_REVOKED;
}
else {
log_info("uid %08lX/%02X%02X: %s: %s\n",
(ulong)keyid[1], uidhash[18], uidhash[19],
_("Invalid user ID revocation"),
g10_errstr(rc) );
}
}
}
write_record( &urec );
} /* end check self-signatures */
if( (urec.r.uid.uidflags & (UIDF_CHECKED|UIDF_VALID))
!= (UIDF_CHECKED|UIDF_VALID) )
return; /* user ID is not valid, so no need to check more things */
/* check the preferences */
if( selfsig )
upd_pref_record( &urec, keyid, selfsig );
/* check non-self signatures */
for( node=uidnode->next; node; node = node->next ) {
PKT_signature *sig;
if( node->pkt->pkttype == PKT_USER_ID )
break; /* ready */
if( node->pkt->pkttype == PKT_PUBLIC_SUBKEY )
break; /* ready */
if( node->pkt->pkttype != PKT_SIGNATURE )
continue;
sig = node->pkt->pkt.signature;
if( keyid[0] == sig->keyid[0] || keyid[1] == sig->keyid[1] )
continue; /* skip self signature */
if( (sig->sig_class&~3) == 0x10 ) { /* regular certification */
upd_cert_record( keyblock, node, keyid, drec, recno_list,
recheck, &urec, uidhash, 0 );
}
else if( sig->sig_class == 0x30 ) { /* cert revocation */
upd_cert_record( keyblock, node, keyid, drec, recno_list,
recheck, &urec, uidhash, 1 );
}
} /* end check certificates */
write_record( &urec );
}
/****************
*
*
*/
static void
upd_pref_record( TRUSTREC *urec, u32 *keyid, PKT_signature *sig )
{
static struct {
sigsubpkttype_t subpkttype;
int preftype;
} ptable[] = {
{ SIGSUBPKT_PREF_SYM, PREFTYPE_SYM },
{ SIGSUBPKT_PREF_HASH, PREFTYPE_HASH },
{ SIGSUBPKT_PREF_COMPR, PREFTYPE_COMPR },
{ 0, 0 }
};
TRUSTREC prec;
ulong lid = urec->r.uid.lid ;
const byte *uidhash = urec->r.uid.namehash;
const byte *s;
size_t n;
int k, i;
ulong recno;
byte prefs_sig[200];
int n_prefs_sig = 0;
byte prefs_rec[200];
int n_prefs_rec = 0;
/* check for changed preferences */
for(k=0; ptable[k].subpkttype; k++ ) {
s = parse_sig_subpkt2( sig, ptable[k].subpkttype, &n );
if( s ) {
if( n_prefs_sig >= DIM(prefs_sig)-1 ) {
log_info("uid %08lX.%lu/%02X%02X: %s\n",
(ulong)keyid[1], lid, uidhash[18], uidhash[19],
_("Too many preferences") );
break;
}
prefs_sig[n_prefs_sig++] = ptable[k].preftype;
prefs_sig[n_prefs_sig++] = *s;
}
}
for( recno=urec->r.uid.prefrec; recno; recno = prec.r.pref.next ) {
read_record( recno, &prec, RECTYPE_PREF );
for(i = 0; i < ITEMS_PER_PREF_RECORD; i +=2 ) {
if( n_prefs_rec >= DIM(prefs_rec)-1 ) {
log_info("uid %08lX.%lu/%02X%02X: %s\n",
(ulong)keyid[1], lid, uidhash[18], uidhash[19],
_("Too many preference items") );
break;
}
prefs_rec[n_prefs_rec++] = prec.r.pref.data[i];
prefs_rec[n_prefs_rec++] = prec.r.pref.data[i+1];
}
}
if( n_prefs_sig == n_prefs_rec
&& !memcmp( prefs_sig, prefs_rec, n_prefs_sig ) )
return; /* not chnaged */
/* Preferences have changed: Delete all pref records
* This is much simpler than checking whether we have to
* do update the record at all - the record cache may care about it
*/
for( recno=urec->r.uid.prefrec; recno; recno = prec.r.pref.next ) {
read_record( recno, &prec, RECTYPE_PREF );
delete_record( recno );
}
if( n_prefs_sig > ITEMS_PER_PREF_RECORD )
log_info(_("WARNING: can't yet handle long pref records\n"));
memset( &prec, 0, sizeof prec );
prec.recnum = tdbio_new_recnum();
prec.rectype = RECTYPE_PREF;
prec.r.pref.lid = lid;
if( n_prefs_sig <= ITEMS_PER_PREF_RECORD )
memcpy( prec.r.pref.data, prefs_sig, n_prefs_sig );
else { /* need more than one pref record */
TRUSTREC tmp;
ulong nextrn;
int n = n_prefs_sig;
byte *pp = prefs_sig;
memcpy( prec.r.pref.data, pp, ITEMS_PER_PREF_RECORD );
n -= ITEMS_PER_PREF_RECORD;
pp += ITEMS_PER_PREF_RECORD;
nextrn = prec.r.pref.next = tdbio_new_recnum();
do {
memset( &tmp, 0, sizeof tmp );
tmp.recnum = nextrn;
tmp.rectype = RECTYPE_PREF;
tmp.r.pref.lid = lid;
if( n <= ITEMS_PER_PREF_RECORD ) {
memcpy( tmp.r.pref.data, pp, n );
n = 0;
}
else {
memcpy( tmp.r.pref.data, pp, ITEMS_PER_PREF_RECORD );
n -= ITEMS_PER_PREF_RECORD;
pp += ITEMS_PER_PREF_RECORD;
nextrn = tmp.r.pref.next = tdbio_new_recnum();
}
write_record( &tmp );
} while( n );
}
write_record( &prec );
urec->r.uid.prefrec = prec.recnum;
urec->dirty = 1;
}
static void
upd_cert_record( KBNODE keyblock, KBNODE signode, u32 *keyid,
TRUSTREC *drec, RECNO_LIST *recno_list, int recheck,
TRUSTREC *urec, const byte *uidhash, int revoke )
{
/* We simply insert the signature into the sig records but
* avoid duplicate ones. We do not check them here because
* there is a big chance, that we import required public keys
* later. The problem with this is that we must somewhere store
* the information about this signature (we need a record id).
* We do this by using the record type shadow dir, which will
* be converted to a dir record as soon as a new public key is
* inserted into the trustdb.
*/
ulong lid = drec->recnum;
PKT_signature *sig = signode->pkt->pkt.signature;
TRUSTREC rec;
ulong recno;
TRUSTREC delrec;
int delrecidx=0;
int newflag = 0;
ulong newlid = 0;
PKT_public_key *pk = m_alloc_clear( sizeof *pk );
ulong pk_lid = 0;
int found_sig = 0;
int found_delrec = 0;
int rc;
delrec.recnum = 0;
/* get the LID of the pubkey of the signature under verification */
rc = get_pubkey( pk, sig->keyid );
if( !rc ) {
if( pk->local_id )
pk_lid = pk->local_id;
else {
rc = tdbio_search_dir_bypk( pk, &rec );
if( !rc )
pk_lid = rec.recnum;
else if( rc == -1 ) { /* see whether there is a sdir instead */
u32 akid[2];
keyid_from_pk( pk, akid );
rc = tdbio_search_sdir( akid, pk->pubkey_algo, &rec );
if( !rc )
pk_lid = rec.recnum;
}
}
}
free_public_key( pk ); pk = NULL;
/* Loop over all signatures just in case one is not correctly
* marked. If we see the correct signature, set a flag.
* delete duplicate signatures (should not happen but...) */
for( recno = urec->r.uid.siglist; recno; recno = rec.r.sig.next ) {
int i;
read_record( recno, &rec, RECTYPE_SIG );
for(i=0; i < SIGS_PER_RECORD; i++ ) {
TRUSTREC tmp;
if( !rec.r.sig.sig[i].lid ) {
if( !found_delrec && !delrec.recnum ) {
delrec = rec;
delrecidx = i;
found_delrec=1;
}
continue; /* skip deleted sigs */
}
if( rec.r.sig.sig[i].lid == pk_lid ) {
if( found_sig ) {
log_info( "sig %08lX.%lu/%02X%02X/%08lX: %s\n",
(ulong)keyid[1], lid, uidhash[18],
uidhash[19], (ulong)sig->keyid[1],
_("Duplicated certificate - deleted") );
rec.r.sig.sig[i].lid = 0;
rec.dirty = 1;
continue;
}
found_sig = 1;
}
if( !recheck && !revoke && (rec.r.sig.sig[i].flag & SIGF_CHECKED) )
continue; /* we already checked this signature */
if( !recheck && (rec.r.sig.sig[i].flag & SIGF_NOPUBKEY) )
continue; /* we do not have the public key */
read_record( rec.r.sig.sig[i].lid, &tmp, 0 );
if( tmp.rectype == RECTYPE_DIR ) {
/* In this case we should now be able to check the signature */
rc = check_key_signature( keyblock, signode, NULL );
if( !rc ) { /* valid signature */
if( opt.verbose )
log_info("sig %08lX.%lu/%02X%02X/%08lX: %s\n",
(ulong)keyid[1], lid, uidhash[18],
uidhash[19], (ulong)sig->keyid[1],
revoke? _("Valid certificate revocation")
: _("Good certificate") );
rec.r.sig.sig[i].flag = SIGF_CHECKED | SIGF_VALID;
if( revoke )
rec.r.sig.sig[i].flag |= SIGF_REVOKED;
}
else if( rc == G10ERR_NO_PUBKEY ) {
if( (rec.r.sig.sig[i].flag & SIGF_CHECKED) )
log_info("sig %08lX.%lu/%02X%02X/%08lX: %s\n",
(ulong)keyid[1], lid, uidhash[18],
uidhash[19], (ulong)sig->keyid[1],
_("Hmmm, public key lost?") );
rec.r.sig.sig[i].flag = SIGF_NOPUBKEY;
if( revoke )
rec.r.sig.sig[i].flag |= SIGF_REVOKED;
}
else {
log_info("sig %08lX.%lu/%02X%02X/%08lX: %s: %s\n",
(ulong)keyid[1], lid, uidhash[18],
uidhash[19], (ulong)sig->keyid[1],
revoke? _("Invalid certificate revocation")
: _("Invalid certificate"),
g10_errstr(rc));
rec.r.sig.sig[i].flag = SIGF_CHECKED;
if( revoke )
rec.r.sig.sig[i].flag |= SIGF_REVOKED;
}
rec.dirty = 1;
}
else if( tmp.rectype == RECTYPE_SDIR ) {
/* must check that it is the right one */
if( tmp.r.sdir.keyid[0] == sig->keyid[0]
&& tmp.r.sdir.keyid[1] == sig->keyid[1]
&& (!tmp.r.sdir.pubkey_algo
|| tmp.r.sdir.pubkey_algo == sig->pubkey_algo )) {
if( !(rec.r.sig.sig[i].flag & SIGF_NOPUBKEY) )
log_info(_("uid %08lX.%lu/%02X%02X: "
"has shadow dir %lu but is not yet marked.\n"),
(ulong)keyid[1], lid,
uidhash[18], uidhash[19], tmp.recnum );
rec.r.sig.sig[i].flag = SIGF_NOPUBKEY;
if( revoke )
rec.r.sig.sig[i].flag |= SIGF_REVOKED;
rec.dirty = 1;
/* fixme: should we verify that the record is
* in the hintlist? - This case here should anyway
* never occur */
}
}
else {
log_error(_("sig record %lu[%d] points to wrong record.\n"),
rec.r.sig.sig[i].lid, i );
die_invalid_db();
}
}
if( found_delrec && delrec.recnum ) {
delrec = rec;
found_delrec = 0; /* we only want the first one */
}
if( rec.dirty ) {
write_record( &rec );
rec.dirty = 0;
}
}
if( found_sig )
return;
/* at this point, we have verified, that the signature is not in
* our list of signatures. Add a new record with that signature
* and if the public key is there, check the signature. */
if( !pk_lid ) /* we have already seen that there is no pubkey */
rc = G10ERR_NO_PUBKEY;
else
rc = check_key_signature( keyblock, signode, NULL );
if( !rc ) { /* valid signature */
if( opt.verbose )
log_info("sig %08lX.%lu/%02X%02X/%08lX: %s\n",
(ulong)keyid[1], lid, uidhash[18],
uidhash[19], (ulong)sig->keyid[1],
revoke? _("Valid certificate revocation")
: _("Good certificate") );
newlid = pk_lid; /* this is the pk of the signature */
newflag = SIGF_CHECKED | SIGF_VALID;
if( revoke )
newflag |= SIGF_REVOKED;
}
else if( rc == G10ERR_NO_PUBKEY ) {
if( opt.verbose > 1 )
log_info("sig %08lX.%lu/%02X%02X/%08lX: %s\n",
(ulong)keyid[1], lid, uidhash[18],
uidhash[19], (ulong)sig->keyid[1], g10_errstr(rc) );
newlid = create_shadow_dir( sig, lid );
newflag = SIGF_NOPUBKEY;
if( revoke )
newflag |= SIGF_REVOKED;
}
else {
log_info( "sig %08lX.%lu/%02X%02X/%08lX: %s: %s\n",
(ulong)keyid[1], lid, uidhash[18], uidhash[19],
(ulong)sig->keyid[1],
revoke? _("Invalid certificate revocation")
: _("Invalid certificate"),
g10_errstr(rc));
newlid = create_shadow_dir( sig, lid );
newflag = SIGF_CHECKED;
if( revoke )
newflag |= SIGF_REVOKED;
}
if( delrec.recnum ) { /* we can reuse a deleted/unused slot */
delrec.r.sig.sig[delrecidx].lid = newlid;
delrec.r.sig.sig[delrecidx].flag= newflag;
write_record( &delrec );
}
else { /* must insert a new sig record */
TRUSTREC tmp;
memset( &tmp, 0, sizeof tmp );
tmp.recnum = tdbio_new_recnum();
tmp.rectype = RECTYPE_SIG;
tmp.r.sig.lid = lid;
tmp.r.sig.next = urec->r.uid.siglist;
tmp.r.sig.sig[0].lid = newlid;
tmp.r.sig.sig[0].flag= newflag;
write_record( &tmp );
urec->r.uid.siglist = tmp.recnum;
urec->dirty = 1;
}
}
/****************
* Update all the info from the public keyblock.
* The key must already exist in the keydb.
* This function is responsible for checking the signatures in cases
* where the public key is already available. If we do not have the public
* key, the check is done by some special code in insert_trust_record().
*/
int
update_trust_record( KBNODE keyblock, int recheck, int *modified )
{
PKT_public_key *primary_pk;
KBNODE node;
TRUSTREC drec;
TRUSTREC krec;
TRUSTREC urec;
TRUSTREC prec;
TRUSTREC helprec;
int rc = 0;
u32 keyid[2]; /* keyid of primary key */
ulong recno, lastrecno;
RECNO_LIST recno_list = NULL; /* list of verified records */
/* fixme: replace recno_list by a lookup on node->recno */
if( modified )
*modified = 0;
node = find_kbnode( keyblock, PKT_PUBLIC_KEY );
primary_pk = node->pkt->pkt.public_key;
rc = get_dir_record( primary_pk, &drec );
if( rc )
return rc;
if( !primary_pk->local_id )
primary_pk->local_id = drec.recnum;
keyid_from_pk( primary_pk, keyid );
/* fixme: check that the keyblock has a valid structure */
rc = tdbio_begin_transaction();
if( rc )
return rc;
/* update the keys */
for( node=keyblock; node; node = node->next ) {
if( node->pkt->pkttype == PKT_PUBLIC_KEY
|| node->pkt->pkttype == PKT_PUBLIC_SUBKEY )
upd_key_record( keyblock, node, keyid,
&drec, &recno_list, recheck );
}
/* update the user IDs */
for( node=keyblock; node; node = node->next ) {
if( node->pkt->pkttype == PKT_USER_ID )
upd_uid_record( keyblock, node, keyid,
&drec, &recno_list, recheck );
}
/* delete keyrecords from the trustdb which are not anymore used */
/* should we really do this, or is it better to keep them and */
/* mark as unused? */
lastrecno = 0;
for( recno=drec.r.dir.keylist; recno; recno = krec.r.key.next ) {
read_record( recno, &krec, RECTYPE_KEY );
if( !qry_recno_list( recno_list, recno, RECTYPE_KEY ) ) {
/* delete this one */
if( !lastrecno ) {
drec.r.dir.keylist = krec.r.key.next;
drec.dirty = 1;
}
else {
read_record( lastrecno, &helprec, RECTYPE_KEY );
helprec.r.key.next = krec.r.key.next;
write_record( &helprec );
}
delete_record( recno );
}
else
lastrecno = recno;
}
/* delete uid records and sig and their pref records from the
* trustdb which are not anymore used */
lastrecno = 0;
for( recno=drec.r.dir.uidlist; recno; recno = urec.r.uid.next ) {
read_record( recno, &urec, RECTYPE_UID );
if( !qry_recno_list( recno_list, recno, RECTYPE_UID ) ) {
ulong r2;
/* delete this one */
if( !lastrecno ) {
drec.r.dir.uidlist = urec.r.uid.next;
drec.dirty = 1;
}
else {
read_record( lastrecno, &helprec, RECTYPE_UID );
helprec.r.uid.next = urec.r.uid.next;
write_record( &helprec );
}
for(r2=urec.r.uid.prefrec ; r2; r2 = prec.r.pref.next ) {
read_record( r2, &prec, RECTYPE_PREF );
delete_record( r2 );
}
for(r2=urec.r.uid.siglist ; r2; r2 = helprec.r.sig.next ) {
read_record( r2, &helprec, RECTYPE_SIG );
delete_record( r2 );
}
delete_record( recno );
}
else
lastrecno = recno;
}
if( rc )
rc = tdbio_cancel_transaction();
else {
drec.r.dir.dirflags |= DIRF_CHECKED;
drec.r.dir.dirflags &= ~DIRF_VALVALID;
write_record( &drec );
if( modified && tdbio_is_dirty() )
*modified = 1;
rc = tdbio_end_transaction();
}
rel_recno_list( &recno_list );
return rc;
}
/****************
* Insert a trust record into the TrustDB
* This function assumes that the record does not yet exist.
*/
int
insert_trust_record( PKT_public_key *pk )
{
TRUSTREC dirrec;
TRUSTREC shadow;
KBNODE keyblock = NULL;
KBNODE node;
byte fingerprint[MAX_FINGERPRINT_LEN];
size_t fingerlen;
int rc = 0;
ulong hintlist = 0;
if( pk->local_id )
log_bug("pk->local_id=%lu\n", pk->local_id );
fingerprint_from_pk( pk, fingerprint, &fingerlen );
/* fixme: assert that we do not have this record.
* we can do this by searching for the primary keyid
*
* fixme: If there is no such key we should look whether one
* of the subkeys has been used to sign another key and in this case
* we got the key anyway. Because a secondary key can't be used
* without a primary key (it is needed to bind the secondary one
* to the primary one which has the user ids etc.)
*/
/* get the keyblock which has the key */
rc = get_keyblock_byfprint( &keyblock, fingerprint, fingerlen );
if( rc ) { /* that should never happen */
log_error( _("insert_trust_record: keyblock not found: %s\n"),
g10_errstr(rc) );
goto leave;
}
/* check that we used the primary key (we are little bit paranoid) */
{ PKT_public_key *a_pk;
u32 akid[2], bkid[2];
node = find_kbnode( keyblock, PKT_PUBLIC_KEY );
a_pk = node->pkt->pkt.public_key;
/* we can't use cmp_public_keys here because some parts (expiredate)
* might not be set in pk <--- but why (fixme) */
keyid_from_pk( a_pk, akid );
keyid_from_pk( pk, bkid );
if( akid[0] != bkid[0] || akid[1] != bkid[1] ) {
log_error(_("did not use primary key for insert_trust_record()\n"));
rc = G10ERR_GENERAL;
goto leave;
}
}
/* We have to look for a shadow dir record which must be reused
* as the dir record. And: check all signatures which are listed
* in the hintlist of the shadow dir record.
*/
rc = tdbio_search_sdir( pk->keyid, pk->pubkey_algo, &shadow );
if( rc && rc != -1 ) {
log_error(_("tdbio_search_dir failed: %s\n"), g10_errstr(rc));
die_invalid_db();
}
memset( &dirrec, 0, sizeof dirrec );
dirrec.rectype = RECTYPE_DIR;
if( !rc ) {
/* hey, great: this key has already signed other keys
* convert this to a real directory entry */
hintlist = shadow.r.sdir.hintlist;
dirrec.recnum = shadow.recnum;
}
else {
dirrec.recnum = tdbio_new_recnum();
}
dirrec.r.dir.lid = dirrec.recnum;
write_record( &dirrec );
/* store the LID */
pk->local_id = dirrec.r.dir.lid;
for( node=keyblock; node; node = node->next ) {
if( node->pkt->pkttype == PKT_PUBLIC_KEY
|| node->pkt->pkttype == PKT_PUBLIC_SUBKEY ) {
PKT_public_key *pk = node->pkt->pkt.public_key;
pk->local_id = dirrec.r.dir.lid;
}
else if( node->pkt->pkttype == PKT_SIGNATURE ) {
PKT_signature *sig = node->pkt->pkt.signature;
sig->local_id = dirrec.r.dir.lid;
}
}
/* and put all the other stuff into the keydb */
rc = update_trust_record( keyblock, 0, NULL );
if( !rc )
process_hintlist( hintlist, dirrec.r.dir.lid );
leave:
if( rc && hintlist )
; /* fixme: the hintlist is not anymore anchored */
release_kbnode( keyblock );
do_sync();
return rc;
}
int
update_ownertrust( ulong lid, unsigned new_trust )
{
TRUSTREC rec;
read_record( lid, &rec, RECTYPE_DIR );
rec.r.dir.ownertrust = new_trust;
write_record( &rec );
do_sync();
return 0;
}
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