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gnupg/g10/trustdb.c

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/* trustdb.c
* Copyright (C) 1998, 1999 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"
#include "ttyio.h"
#if MAX_FINGERPRINT_LEN > 20
#error Must change structure of trustdb
#endif
struct keyid_list {
struct keyid_list *next;
u32 keyid[2];
};
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;
struct enum_cert_paths_ctx {
int init;
int idx;
};
struct recno_list_struct {
struct recno_list_struct *next;
ulong recno;
int type;
};
typedef struct recno_list_struct *RECNO_LIST;
typedef struct trust_node *TN;
struct trust_node {
TN back; /* parent */
TN list; /* list of other node (should all be of the same type)*/
TN next; /* used to build the list */
int is_uid; /* set if this is an uid node */
ulong lid; /* key or uid recordnumber */
union {
struct {
int ownertrust;
int validity;
/* helper */
int buckstop;
} k;
struct {
int marginal_count;
int fully_count;
int validity;
} u;
} n;
};
static TN used_tns;
static int alloced_tns;
static int max_alloced_tns;
static LOCAL_ID_TABLE new_lid_table(void);
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 int propagate_validity( TN root, TN node,
int (*add_fnc)(ulong), unsigned *retflgs );
static void print_user_id( FILE *fp, const char *text, u32 *keyid );
static int do_check( TRUSTREC *drec, unsigned *trustlevel,
const char *nhash, int (*add_fnc)(ulong),
unsigned *retflgs);
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 revoked,
int *mod_up, int *mod_down );
/* a table used to keep track of ultimately trusted keys
* which are the ones from our secrings and the trusted keys */
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;
static struct {
int init;
int level;
char *dbname;
} trustdb_args;
/**********************************************
*********** record read write **************
**********************************************/
/****************
* 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) );
tdbio_invalid();
}
/****************
* 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) );
tdbio_invalid();
}
/****************
* 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) );
tdbio_invalid();
}
/****************
* sync the db
*/
static void
do_sync(void)
{
int rc = tdbio_sync();
if( !rc )
return;
log_error(_("trustdb: sync failed: %s\n"), g10_errstr(rc) );
g10_exit(2);
}
/**********************************************
***************** 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;
}
#if 0
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;
}
#endif
/****************
* 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;
}
static TN
new_tn(void)
{
TN t;
if( used_tns ) {
t = used_tns;
used_tns = t->next;
memset( t, 0, sizeof *t );
}
else
t = m_alloc_clear( sizeof *t );
if( ++alloced_tns > max_alloced_tns )
max_alloced_tns = alloced_tns;
return t;
}
static void
release_tn( TN t )
{
if( t ) {
t->next = used_tns;
used_tns = t;
alloced_tns--;
}
}
static void
release_tn_tree( TN kr )
{
TN kr2;
for( ; kr; kr = kr2 ) {
release_tn_tree( kr->list );
kr2 = kr->next;
release_tn( kr );
}
}
/**********************************************
****** access by LID and other helpers *******
**********************************************/
/****************
* Return the keyid from the primary key identified by LID.
*/
int
keyid_from_lid( ulong lid, u32 *keyid )
{
TRUSTREC rec;
int rc;
init_trustdb();
keyid[0] = keyid[1] = 0;
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;
init_trustdb();
get_dir_record( pk, &rec );
}
return pk->local_id;
}
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;
}
/****************
* Get the LID of a public key.
* Returns: The LID of the key (note, that this may be a shadow dir)
* or 0 if not available.
*/
static ulong
lid_from_keyid( u32 *keyid )
{
PKT_public_key *pk = m_alloc_clear( sizeof *pk );
TRUSTREC rec;
ulong lid = 0;
int rc;
rc = get_pubkey( pk, keyid );
if( !rc ) {
if( pk->local_id )
lid = pk->local_id;
else {
rc = tdbio_search_dir_bypk( pk, &rec );
if( !rc )
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 )
lid = rec.recnum;
}
}
}
free_public_key( pk );
return lid;
}
/***********************************************
************* Initialization ****************
***********************************************/
/****************
* Verify that all our public keys are in the trustdb.
*/
static int
verify_own_keys(void)
{
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 ) ) ) {
int have_pk = 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;
}
have_pk=1;
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 trusted key table\n"),
(ulong)keyid[1]);
else if( opt.verbose > 1 )
log_info(_("key %08lX: accepted as trusted key.\n"),
(ulong)keyid[1]);
skip:
release_secret_key_parts( sk );
if( have_pk )
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;
}
/****************
* Perform some checks over the trustdb
* level 0: only open the db
* 1: used for initial program startup
*/
int
setup_trustdb( int level, const char *dbname )
{
/* just store the args */
if( trustdb_args.init )
return 0;
trustdb_args.level = level;
trustdb_args.dbname = dbname? m_strdup(dbname): NULL;
return 0;
}
void
init_trustdb()
{
int rc=0;
int level = trustdb_args.level;
const char* dbname = trustdb_args.dbname;
if( trustdb_args.init )
return;
trustdb_args.init = 1;
if( !ultikey_table )
ultikey_table = new_lid_table();
if( !level || level==1 ) {
rc = tdbio_set_dbname( dbname, !!level );
if( !rc ) {
if( !level )
return;
/* 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();
if( rc )
log_fatal("can't init trustdb: %s\n", g10_errstr(rc) );
}
/***********************************************
************* Print helpers ****************
***********************************************/
static void
print_user_id( FILE *fp, const char *text, u32 *keyid )
{
char *p;
size_t n;
p = get_user_id( keyid, &n );
if( fp ) {
fprintf( fp, "%s \"", text );
print_string( fp, p, n, 0 );
putc('\"', fp);
putc('\n', fp);
}
else {
tty_printf( "%s \"", text );
tty_print_string( p, n );
tty_printf( "\"\n" );
}
m_free(p);
}
int
trust_letter( unsigned value )
{
switch( value ) {
case TRUST_UNKNOWN: return '-';
case TRUST_EXPIRED: return 'e';
case TRUST_UNDEFINED: return 'q';
case TRUST_NEVER: return 'n';
case TRUST_MARGINAL: return 'm';
case TRUST_FULLY: return 'f';
case TRUST_ULTIMATE: return 'u';
default: return 0 ;
}
}
#if 0
static void
print_path( int pathlen, TN ME .........., FILE *fp, ulong highlight )
{
int rc, c, i;
u32 keyid[2];
char *p;
size_t n;
for( i = 0; i < pathlen; i++ ) {
if( highlight )
fputs(highlight == path[i].lid? "* ":" ", fp );
rc = keyid_from_lid( path[i].lid, keyid );
if( rc )
fprintf(fp, "????????.%lu:", path[i].lid );
else
fprintf(fp,"%08lX.%lu:", (ulong)keyid[1], path[i].lid );
c = trust_letter(path[i].otrust);
if( c )
putc( c, fp );
else
fprintf( fp, "%02x", path[i].otrust );
putc('/', fp);
c = trust_letter(path[i].trust);
if( c )
putc( c, fp );
else
fprintf( fp, "%02x", path[i].trust );
putc(' ', fp);
p = get_user_id( keyid, &n );
putc(' ', fp);
putc('\"', fp);
print_string( fp, p, n > 40? 40:n, 0 );
putc('\"', fp);
m_free(p);
putc('\n', fp );
}
}
#endif
static void
print_default_uid( FILE *fp, ulong lid )
{
u32 keyid[2];
if( !keyid_from_lid( lid, keyid ) )
print_user_id( fp, "", keyid );
}
static void
print_uid_from_keyblock( FILE *fp, KBNODE keyblock, ulong urecno )
{
TRUSTREC urec;
KBNODE node;
byte uhash[20];
read_record( urecno, &urec, RECTYPE_UID );
for( node=keyblock; node; node = node->next ) {
if( node->pkt->pkttype == PKT_USER_ID ) {
PKT_user_id *uidpkt = node->pkt->pkt.user_id;
rmd160_hash_buffer( uhash, uidpkt->name, uidpkt->len );
if( !memcmp( uhash, urec.r.uid.namehash, 20 ) ) {
print_string( fp, uidpkt->name, uidpkt->len, ':' );
return;
}
}
}
fputs("[?]", fp );
}
static void
dump_tn_tree( FILE *fp, int level, TN tree )
{
TN kr, ur;
for( kr=tree; kr; kr = kr->next ) {
if( fp ) {
fprintf( fp, "%*s", level*4, "" );
fprintf( fp, "K%lu(ot=%d,val=%d) ", kr->lid,
kr->n.k.ownertrust,
kr->n.k.validity );
}
else {
tty_printf("%*s", level*4, "" );
tty_printf("K%lu(ot=%d,val=%d) ", kr->lid,
kr->n.k.ownertrust,
kr->n.k.validity );
}
print_default_uid( fp, kr->lid );
for( ur=kr->list; ur; ur = ur->next ) {
if( fp ) {
fprintf(fp, "%*s ", level*4, "" );
fprintf(fp, "U%lu(mc=%d,fc=%d,val=%d)\n", ur->lid,
ur->n.u.marginal_count,
ur->n.u.fully_count,
ur->n.u.validity
);
}
else {
tty_printf("%*s ", level*4, "" );
tty_printf("U%lu(mc=%d,fc=%d,val=%d)\n", ur->lid,
ur->n.u.marginal_count,
ur->n.u.fully_count,
ur->n.u.validity
);
}
dump_tn_tree( fp, level+1, ur->list );
}
}
}
/****************
* Special version of dump_tn_tree, which prints it colon delimited.
* Format:
* level:keyid:type:recno:ot:val:mc:cc:name:
* With TYPE = U for a user ID
* K for a key
* The RECNO is either the one of the dir record or the one of the uid record.
* OT is the the usual trust letter and only availabel on K lines.
* VAL is the calcualted validity
* MC is the marginal trust counter and only available on U lines
* CC is the same for the complete count
* NAME ist the username and only printed on U lines
*/
static void
dump_tn_tree_with_colons( int level, TN tree )
{
TN kr, ur;
for( kr=tree; kr; kr = kr->next ) {
KBNODE kb = NULL;
u32 kid[2];
keyid_from_lid( kr->lid, kid );
get_keyblock_bylid( &kb, kr->lid );
printf( "%d:%08lX%08lX:K:%lu:%c:%c::::\n",
level, (ulong)kid[0], (ulong)kid[1], kr->lid,
trust_letter( kr->n.k.ownertrust ),
trust_letter( kr->n.k.validity ) );
for( ur=kr->list; ur; ur = ur->next ) {
printf( "%d:%08lX%08lX:U:%lu::%c:%d:%d:",
level, (ulong)kid[0], (ulong)kid[1], ur->lid,
trust_letter( kr->n.u.validity ),
ur->n.u.marginal_count,
ur->n.u.fully_count );
print_uid_from_keyblock( stdout, kb, ur->lid );
putchar(':');
putchar('\n');
dump_tn_tree_with_colons( level+1, ur->list );
}
release_kbnode( kb );
}
}
/***********************************************
************* trustdb maintenance ***********
***********************************************/
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 revoked = 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
|| ( revoked = (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],
revoked? _("Valid certificate revocation")
: _("Good certificate") );
sigrec->r.sig.sig[sigidx].flag = SIGF_CHECKED | SIGF_VALID;
if( revoked )
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
* FIXME: add mod_up/down handling
*/
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));
tdbio_invalid();
}
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; /* same as recheck */
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 (we check only one key at a time) */
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; /* here we only care about a self-signatures */
if( sig->sig_class == 0x18 && !keybind_seen ) { /* a keybinding */
if( keynode->pkt->pkttype == PKT_PUBLIC_KEY )
continue; /* oops, ignore subkey binding on 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, int *mod_up, int *mod_down )
{
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;
if( DBG_TRUST )
log_debug("upd_uid_record for %08lX/%02X%02X\n",
(ulong)keyid[1], uidhash[18], uidhash[19]);
/* 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; /* insert is the same as a recheck */
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) ) {
unsigned orig_uidflags = urec.r.uid.uidflags;
urec.r.uid.uidflags = 0;
/* first check regular 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; /* 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 if( sig->timestamp > selfsig->timestamp
&& sig->sig_class >= selfsig->sig_class )
selfsig = sig; /* but this one is newer */
}
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;
}
}
}
/* and now check for revocations- we must do this after the
* self signature check because a selfsignature which is newer
* than a revocation makes the revocation invalid.
* Fixme: Is this correct - check with rfc2440
*/
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 == 0x30 ) { /* cert revocation */
rc = check_key_signature( keyblock, node, NULL );
if( !rc && selfsig && selfsig->timestamp > sig->timestamp ) {
log_info( "uid %08lX.%lu/%02X%02X: %s\n",
(ulong)keyid[1], lid, uidhash[18], uidhash[19],
_("Valid user ID revocation skipped "
"due to a newer self signature\n") );
}
else 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) );
}
}
}
if( orig_uidflags != urec.r.uid.uidflags ) {
write_record( &urec );
if( !( urec.r.uid.uidflags & UIDF_VALID )
|| ( urec.r.uid.uidflags & UIDF_REVOKED ) )
*mod_down=1;
else
*mod_up=1; /*(maybe a new user id)*/
/* Hmmm, did we catch changed expiration dates? */
}
} /* 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 );
/* Now we va check the certication 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; /* here we skip the self-signatures */
if( (sig->sig_class&~3) == 0x10 ) { /* regular certification */
upd_cert_record( keyblock, node, keyid, drec, recno_list,
recheck, &urec, uidhash, 0, mod_up, mod_down );
}
else if( sig->sig_class == 0x30 ) { /* cert revocation */
upd_cert_record( keyblock, node, keyid, drec, recno_list,
recheck, &urec, uidhash, 1, mod_up, mod_down );
}
} /* 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;
if( DBG_TRUST )
log_debug("upd_pref_record for %08lX.%lu/%02X%02X\n",
(ulong)keyid[1], lid, uidhash[18], uidhash[19] );
/* check for changed preferences */
for(k=0; ptable[k].subpkttype; k++ ) {
s = parse_sig_subpkt2( sig, ptable[k].subpkttype, &n );
if( s ) {
for( ; n; n--, 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;
}
if( prec.r.pref.data[i] ) {
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 changed */
/* 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;
byte *pp = prefs_sig;
n = n_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 revoked,
int *mod_up, int *mod_down )
{
/* 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 when the missing public key
* gets 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;
ulong pk_lid = 0;
int found_sig = 0;
int found_delrec = 0;
int rc;
if( DBG_TRUST )
log_debug("upd_cert_record for %08lX.?/%02X%02X/%08lX\n",
(ulong)keyid[1], uidhash[18],
uidhash[19], (ulong)sig->keyid[1] );
delrec.recnum = 0;
/* get the LID of the pubkey of the signature under verification */
pk_lid = lid_from_keyid( sig->keyid );
/* 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 ) {
/* (remember this unused slot) */
if( !found_delrec && !delrec.recnum ) {
delrec = rec;
delrecidx = i;
found_delrec=1;
}
continue; /* skip unused slots */
}
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 && !revoked && (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 ) {
/* the public key is in the trustdb: check sig */
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],
revoked? _("Valid certificate revocation")
: _("Good certificate") );
rec.r.sig.sig[i].flag = SIGF_CHECKED | SIGF_VALID;
if( revoked ) { /* we are investigating revocations */
rec.r.sig.sig[i].flag |= SIGF_REVOKED;
*mod_down = 1;
}
else
*mod_up = 1;
}
else if( rc == G10ERR_NO_PUBKEY ) {
/* This may happen if the key is still in the trustdb
* but not available in the keystorage */
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],
_("public key not anymore available") );
rec.r.sig.sig[i].flag = SIGF_NOPUBKEY;
*mod_down = 1;
if( revoked )
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],
revoked? _("Invalid certificate revocation")
: _("Invalid certificate"),
g10_errstr(rc));
rec.r.sig.sig[i].flag = SIGF_CHECKED;
if( revoked ) {
rec.r.sig.sig[i].flag |= SIGF_REVOKED;
*mod_down = 1;
}
}
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( revoked )
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 );
tdbio_invalid();
}
}
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],
revoked? _("Valid certificate revocation")
: _("Good certificate") );
newlid = pk_lid; /* this is the pk of the signature */
newflag = SIGF_CHECKED | SIGF_VALID;
if( revoked ) {
newflag |= SIGF_REVOKED;
*mod_down = 1;
}
else
*mod_up = 1;
}
else if( rc == G10ERR_NO_PUBKEY ) {
if( opt.verbose > 1 || DBG_TRUST )
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( revoked )
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],
revoked? _("Invalid certificate revocation")
: _("Invalid certificate"),
g10_errstr(rc));
newlid = create_shadow_dir( sig, lid );
newflag = SIGF_CHECKED;
if( revoked )
newflag |= SIGF_REVOKED;
*mod_down = 1;
}
if( delrec.recnum ) { /* we can reuse an unused slot */
delrec.r.sig.sig[delrecidx].lid = newlid;
delrec.r.sig.sig[delrecidx].flag= newflag;
write_record( &delrec );
}
else { /* we 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;
int mod_up = 0;
int mod_down = 0;
RECNO_LIST recno_list = NULL; /* list of verified records */
/* fixme: replace recno_list by a lookup on node->recno */
if( opt.dry_run )
return 0;
init_trustdb();
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, &mod_up, &mod_down );
}
/* 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? */
/* And set the revocation flag into the dir record */
drec.r.dir.dirflags &= ~DIRF_REVOKED;
lastrecno = 0;
for( recno=drec.r.dir.keylist; recno; recno = krec.r.key.next ) {
read_record( recno, &krec, RECTYPE_KEY );
if( recno == drec.r.dir.keylist ) { /* this is the primary key */
if( (krec.r.key.keyflags & KEYF_REVOKED) ) {
drec.r.dir.dirflags |= DIRF_REVOKED;
drec.dirty = 1;
}
}
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 {
if( modified && tdbio_is_dirty() )
*modified = 1;
drec.r.dir.dirflags |= DIRF_CHECKED;
drec.r.dir.valcheck = 0;
write_record( &drec );
tdbio_write_modify_stamp( mod_up, mod_down );
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 *orig_pk )
{
TRUSTREC dirrec;
TRUSTREC shadow;
KBNODE keyblock = NULL;
KBNODE node;
byte fingerprint[MAX_FINGERPRINT_LEN];
size_t fingerlen;
int rc = 0;
ulong hintlist = 0;
PKT_public_key *pk;
if( opt.dry_run )
return 0;
init_trustdb();
fingerprint_from_pk( orig_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 - this is 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.)
*/
if( orig_pk->local_id )
log_debug("insert_trust_record with pk->local_id=%lu (1)\n",
orig_pk->local_id );
/* 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;
}
/* make sure that we use the primary key */
pk = find_kbnode( keyblock, PKT_PUBLIC_KEY )->pkt->pkt.public_key;
if( pk->local_id ) {
orig_pk->local_id = pk->local_id;
log_debug("insert_trust_record with pk->local_id=%lu (2)\n",
pk->local_id );
rc = update_trust_record( keyblock, 1, NULL );
release_kbnode( keyblock );
return rc;
}
/* 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));
tdbio_invalid();
}
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 );
/* out the LID into the keyblock */
pk->local_id = dirrec.r.dir.lid;
orig_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 *a_pk = node->pkt->pkt.public_key;
a_pk->local_id = dirrec.r.dir.lid;
}
else if( node->pkt->pkttype == PKT_SIGNATURE ) {
PKT_signature *a_sig = node->pkt->pkt.signature;
a_sig->local_id = dirrec.r.dir.lid;
}
}
/* mark tdb as modified upwards */
tdbio_write_modify_stamp( 1, 0 );
/* and put all the other stuff into the keydb */
rc = update_trust_record( keyblock, 1, 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;
}
/***********************************************
********* Trust calculation *****************
***********************************************/
/****************
* Find all certification paths of a given LID.
* Limit the search to MAX_DEPTH. stack is a helper variable which
* should have been allocated with size max_depth, stack[0] should
* be setup to the key we are investigating, so the minimal depth
* we should ever see in this function is 1.
* Returns: a new tree
* certchain_set must be a valid set or point to NULL; this function
* may modifiy it.
*
* Fixme: add a fastscan mode which stops ad valid validity nodes.
*/
static TN
build_cert_tree( ulong lid, int depth, int max_depth, TN helproot )
{
TRUSTREC dirrec;
TRUSTREC uidrec;
ulong uidrno;
TN keynode;
if( depth >= max_depth )
return NULL;
keynode = new_tn();
if( !helproot )
helproot = keynode;
keynode->lid = lid;
if( !qry_lid_table_flag( ultikey_table, lid, NULL ) ) {
/* this is an ultimately trusted key;
* which means that we have found the end of the chain:
* We do this here prior to reading the dir record
* because we don't really need the info from that record */
keynode->n.k.ownertrust = TRUST_ULTIMATE;
keynode->n.k.buckstop = 1;
return keynode;
}
read_record( lid, &dirrec, 0 );
if( dirrec.rectype != RECTYPE_DIR ) {
if( dirrec.rectype != RECTYPE_SDIR )
log_debug("lid %lu, has rectype %d"
" - skipped\n", lid, dirrec.rectype );
m_free(keynode);
return NULL;
}
keynode->n.k.ownertrust = dirrec.r.dir.ownertrust;
/* loop over all user ids */
for( uidrno = dirrec.r.dir.uidlist; uidrno; uidrno = uidrec.r.uid.next ) {
TRUSTREC sigrec;
ulong sigrno;
TN uidnode = NULL;
read_record( uidrno, &uidrec, RECTYPE_UID );
if( !(uidrec.r.uid.uidflags & UIDF_CHECKED) )
continue; /* user id has not been checked */
if( !(uidrec.r.uid.uidflags & UIDF_VALID) )
continue; /* user id is not valid */
if( (uidrec.r.uid.uidflags & UIDF_REVOKED) )
continue; /* user id has been revoked */
/* loop over all signature records */
for(sigrno=uidrec.r.uid.siglist; sigrno; sigrno = sigrec.r.sig.next ) {
int i;
TN tn;
read_record( sigrno, &sigrec, RECTYPE_SIG );
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].flag & SIGF_CHECKED) )
continue; /* skip unchecked signatures */
if( !(sigrec.r.sig.sig[i].flag & SIGF_VALID) )
continue; /* skip invalid signatures */
if( (sigrec.r.sig.sig[i].flag & SIGF_EXPIRED) )
continue; /* skip expired signatures */
if( (sigrec.r.sig.sig[i].flag & SIGF_REVOKED) )
continue; /* skip revoked signatures */
/* check for cycles */
for( tn=keynode; tn && tn->lid != sigrec.r.sig.sig[i].lid;
tn = tn->back )
;
if( tn )
continue; /* cycle found */
tn = build_cert_tree( sigrec.r.sig.sig[i].lid,
depth+1, max_depth, helproot );
if( !tn )
continue; /* cert chain too deep or error */
if( !uidnode ) {
uidnode = new_tn();
uidnode->back = keynode;
uidnode->lid = uidrno;
uidnode->is_uid = 1;
uidnode->next = keynode->list;
keynode->list = uidnode;
}
tn->back = uidnode;
tn->next = uidnode->list;
uidnode->list = tn;
#if 0 /* optimazation - fixme: reenable this later */
if( tn->n.k.buckstop ) {
/* ultimately trusted key found:
* no need to check more signatures of this uid */
sigrec.r.sig.next = 0;
break;
}
#endif
}
} /* end loop over sig recs */
} /* end loop over user ids */
if( !keynode->list ) {
release_tn_tree( keynode );
keynode = NULL;
}
return keynode;
}
static void
upd_one_ownertrust( ulong lid, unsigned new_trust, unsigned *retflgs )
{
TRUSTREC rec;
read_record( lid, &rec, RECTYPE_DIR );
if( DBG_TRUST )
log_debug("upd_one_ownertrust of %lu from %u to %u\n",
lid, (unsigned)rec.r.dir.ownertrust, new_trust );
if( retflgs ) {
if( new_trust > rec.r.dir.ownertrust )
*retflgs |= 16; /* modified up */
else
*retflgs |= 32; /* modified down */
}
rec.r.dir.ownertrust = new_trust;
write_record( &rec );
}
/****************
* Update the ownertrust in the complete tree.
*/
static void
propagate_ownertrust( TN kr, ulong lid, unsigned trust )
{
TN ur;
for( ; kr; kr = kr->next ) {
if( kr->lid == lid )
kr->n.k.ownertrust = trust;
for( ur=kr->list; ur; ur = ur->next )
propagate_ownertrust( ur->list, lid, trust );
}
}
/****************
* Calculate the validity of all keys in the tree and especially
* the one of the top key. If add_fnc is not NULL, it is used to
* ask for missing ownertrust values (but only if this will help
* us to increase the validity.
* add_fnc is expected to take the LID of the key under question
* and return a ownertrust value or an error: positive values
* are assumed to be the new ownertrust value; a 0 does mean no change,
* a -1 is a request to cancel this validation procedure, a -2 requests
* a listing of the sub-tree using the tty functions.
*
*
* Returns: 0 = okay
*/
static int
propagate_validity( TN root, TN node, int (*add_fnc)(ulong), unsigned *retflgs )
{
TN kr, ur;
int max_validity = 0;
assert( !node->is_uid );
if( node->n.k.ownertrust == TRUST_ULTIMATE ) {
/* this is one of our keys */
assert( !node->list ); /* it should be a leaf */
node->n.k.validity = TRUST_ULTIMATE;
if( retflgs )
*retflgs |= 1; /* found a path to an ultimately trusted key */
return 0;
}
/* loop over all user ids */
for( ur=node->list; ur; ur = ur->next ) {
assert( ur->is_uid );
/* loop over all signators */
for(kr=ur->list; kr; kr = kr->next ) {
if( propagate_validity( root, kr, add_fnc, retflgs ) )
return -1; /* quit */
if( kr->n.k.validity == TRUST_ULTIMATE ) {
ur->n.u.fully_count = opt.completes_needed;
}
else if( kr->n.k.validity == TRUST_FULLY ) {
if( add_fnc && !kr->n.k.ownertrust ) {
int rc;
if( retflgs )
*retflgs |= 2; /* found key with undefined ownertrust*/
do {
rc = add_fnc( kr->lid );
switch( rc ) {
case TRUST_NEVER:
case TRUST_MARGINAL:
case TRUST_FULLY:
propagate_ownertrust( root, kr->lid, rc );
upd_one_ownertrust( kr->lid, rc, retflgs );
if( retflgs )
*retflgs |= 4; /* changed */
break;
case -1:
return -1; /* cancel */
case -2:
dump_tn_tree( NULL, 0, kr );
tty_printf("\n");
break;
default:
break;
}
} while( rc == -2 );
}
if( kr->n.k.ownertrust == TRUST_FULLY )
ur->n.u.fully_count++;
else if( kr->n.k.ownertrust == TRUST_MARGINAL )
ur->n.u.marginal_count++;
}
}
/* fixme: We can move this test into the loop to stop as soon as
* we have a level of FULLY and return from this function
* We dont do this now to get better debug output */
if( ur->n.u.fully_count >= opt.completes_needed
|| ur->n.u.marginal_count >= opt.marginals_needed )
ur->n.u.validity = TRUST_FULLY;
else if( ur->n.u.fully_count || ur->n.u.marginal_count )
ur->n.u.validity = TRUST_MARGINAL;
if( ur->n.u.validity >= max_validity )
max_validity = ur->n.u.validity;
}
node->n.k.validity = max_validity;
return 0;
}
/****************
* 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, const char *namehash,
int (*add_fnc)(ulong), unsigned *retflgs )
{
TN tree;
int keytrust;
int pv_result;
tree = build_cert_tree( drec->r.dir.lid, 0, opt.max_cert_depth, NULL );
if( !tree )
return TRUST_UNDEFINED;
pv_result = propagate_validity( tree, tree, add_fnc, retflgs );
if( namehash ) {
/* find the matching user id.
* fixme: the way we handle this is too inefficient */
TN ur;
TRUSTREC rec;
keytrust = 0;
for( ur=tree->list; ur; ur = ur->next ) {
read_record( ur->lid, &rec, RECTYPE_UID );
if( !memcmp( namehash, rec.r.uid.namehash, 20 ) ) {
keytrust = ur->n.u.validity;
break;
}
}
}
else
keytrust = tree->n.k.validity;
/* update the cached validity values */
if( !pv_result
&& keytrust >= TRUST_UNDEFINED
&& tdbio_db_matches_options()
&& ( !drec->r.dir.valcheck || drec->r.dir.validity != keytrust ) ) {
TN ur;
TRUSTREC rec;
for( ur=tree->list; ur; ur = ur->next ) {
read_record( ur->lid, &rec, RECTYPE_UID );
if( rec.r.uid.validity != ur->n.u.validity ) {
rec.r.uid.validity = ur->n.u.validity;
write_record( &rec );
}
}
drec->r.dir.validity = tree->n.k.validity;
drec->r.dir.valcheck = make_timestamp();
write_record( drec );
do_sync();
}
release_tn_tree( tree );
return keytrust;
}
/****************
* 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,
const char *namehash, int (*add_fnc)(ulong), unsigned *retflgs )
{
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( retflgs )
*retflgs &= ~(16|32); /* reset the 2 special flags */
if( namehash ) {
/* Fixme: use the cache */
*validity = verify_key( opt.max_cert_depth, dr, namehash,
add_fnc, retflgs );
}
else if( !add_fnc
&& tdbio_db_matches_options()
&& dr->r.dir.valcheck
> tdbio_read_modify_stamp( (dr->r.dir.validity < TRUST_FULLY) )
&& dr->r.dir.validity )
*validity = dr->r.dir.validity;
else
*validity = verify_key( opt.max_cert_depth, dr, NULL,
add_fnc, retflgs );
if( !(*validity & TRUST_MASK) )
*validity = TRUST_UNDEFINED;
if( dr->r.dir.dirflags & DIRF_REVOKED )
*validity |= TRUST_FLAG_REVOKED;
/* If we have changed some ownertrusts, set the trustdb timestamps
* and do a sync */
if( retflgs && (*retflgs & (16|32)) ) {
tdbio_write_modify_stamp( (*retflgs & 16), (*retflgs & 32) );
do_sync();
}
return 0;
}
/***********************************************
********* Change trustdb values **************
***********************************************/
int
update_ownertrust( ulong lid, unsigned new_trust )
{
TRUSTREC rec;
init_trustdb();
read_record( lid, &rec, RECTYPE_DIR );
if( DBG_TRUST )
log_debug("update_ownertrust of %lu from %u to %u\n",
lid, (unsigned)rec.r.dir.ownertrust, new_trust );
rec.r.dir.ownertrust = new_trust;
write_record( &rec );
do_sync();
return 0;
}
int
clear_trust_checked_flag( PKT_public_key *pk )
{
TRUSTREC rec;
int rc;
if( opt.dry_run )
return 0;
init_trustdb();
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.valcheck )
return 0;
/* reset the flag */
rec.r.dir.dirflags &= ~DIRF_CHECKED;
rec.r.dir.valcheck = 0;
write_record( &rec );
do_sync();
return 0;
}
/****************
* 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;
if( opt.dry_run )
return;
init_trustdb();
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 = keyblock->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 );
}
/****************
* Check the complete trustdb or only the entries for the given username.
* We check the complete database. If a username is given or the special
* username "*" is used, a complete recheck is done. With no user ID
* only the records which are not yet checkd are now checked.
*/
void
check_trustdb( const char *username )
{
TRUSTREC rec;
KBNODE keyblock = NULL;
KBPOS kbpos;
int rc;
int recheck = username && *username == '*' && !username[1];
init_trustdb();
if( username && !recheck ) {
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, 1, &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, recheck, &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);
}
}
/***********************************************
********* Query trustdb values **************
***********************************************/
/****************
* This function simply looks for the key in the trustdb
* and makes sure that pk->local_id is set to the correct value.
* Return: 0 = found
* -1 = not found
* other = error
*/
int
query_trust_record( PKT_public_key *pk )
{
TRUSTREC rec;
init_trustdb();
return get_dir_record( pk, &rec );
}
/****************
* 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,
const byte *namehash, int (*add_fnc)(ulong), unsigned *retflgs )
{
TRUSTREC rec;
unsigned trustlevel = TRUST_UNKNOWN;
int rc=0;
u32 cur_time;
u32 keyid[2];
init_trustdb();
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, namehash, add_fnc, retflgs );
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, const byte *namehash )
{
unsigned trustlevel;
int c;
init_trustdb();
if( check_trust( pk, &trustlevel, namehash, NULL, NULL ) )
return '?';
if( trustlevel & TRUST_FLAG_REVOKED )
return 'r';
c = trust_letter( (trustlevel & TRUST_MASK) );
if( !c )
c = '?';
return c;
}
/****************
* Return the assigned ownertrust value for the given LID
*/
unsigned
get_ownertrust( ulong lid )
{
TRUSTREC rec;
init_trustdb();
read_record( lid, &rec, RECTYPE_DIR );
return rec.r.dir.ownertrust;
}
int
get_ownertrust_info( ulong lid )
{
unsigned otrust;
int c;
init_trustdb();
otrust = get_ownertrust( lid );
c = trust_letter( (otrust & TRUST_MASK) );
if( !c )
c = '?';
return c;
}
void
list_trust_path( const char *username )
{
int rc;
ulong lid;
TRUSTREC rec;
TN tree;
PKT_public_key *pk = m_alloc_clear( sizeof *pk );
init_trustdb();
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 );
}
}
lid = pk->local_id;
tree = build_cert_tree( lid, 0, opt.max_cert_depth, NULL );
if( tree )
propagate_validity( tree, tree, NULL, NULL );
if( opt.with_colons )
dump_tn_tree_with_colons( 0, tree );
else
dump_tn_tree( stdout, 0, tree );
/*printf("(alloced tns=%d max=%d)\n", alloced_tns, max_alloced_tns );*/
release_tn_tree( tree );
/*printf("Ownertrust=%c Validity=%c\n", get_ownertrust_info( lid ),
query_trust_info( pk, NULL ) ); */
free_public_key( pk );
}
/****************
* 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 )
{
return -1;
#if 0
struct enum_cert_paths_ctx *ctx;
fixme: ..... tsl;
init_trustdb();
if( !lid ) { /* release the context */
if( *context ) {
FIXME: ........tsl2;
ctx = *context;
for(tsl = ctx->tsl_head; tsl; tsl = tsl2 ) {
tsl2 = tsl->next;
m_free( tsl );
}
*context = NULL;
}
return -1;
}
if( !*context ) {
FIXME .... *tmppath;
TRUSTREC rec;
if( !*lid )
return -1;
ctx = m_alloc_clear( sizeof *ctx );
*context = ctx;
/* collect the paths */
#if 0
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 );
sort_tsl_list( &tsl );
#endif
/* setup the context */
ctx->tsl_head = tsl;
ctx->tsl = ctx->tsl_head;
ctx->idx = 0;
}
else
ctx = *context;
while( ctx->tsl && ctx->idx >= ctx->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;
#endif
}
/****************
* Print the current path
*/
void
enum_cert_paths_print( void **context, FILE *fp,
int refresh, ulong selected_lid )
{
return;
#if 0
struct enum_cert_paths_ctx *ctx;
FIXME......... tsl;
if( !*context )
return;
init_trustdb();
ctx = *context;
if( !ctx->tsl )
return;
tsl = ctx->tsl;
if( !fp )
fp = stderr;
if( refresh ) { /* update the ownertrust and if possible the validity */
int i;
int match = tdbio_db_matches_options();
for( i = 0; i < tsl->pathlen; i++ ) {
TRUSTREC rec;
read_record( tsl->path[i].lid, &rec, RECTYPE_DIR );
tsl->path[i].otrust = rec.r.dir.ownertrust;
/* update validity only if we have it in the cache
* calculation is too time consuming */
if( match && rec.r.dir.valcheck && rec.r.dir.validity ) {
tsl->path[i].trust = rec.r.dir.validity;
if( rec.r.dir.dirflags & DIRF_REVOKED )
tsl->path[i].trust = TRUST_FLAG_REVOKED;
}
}
}
print_path( tsl->pathlen, tsl->path, fp, selected_lid );
#endif
}
/*
* Return an allocated buffer with the preference values for
* the key with LID and the userid which is identified by the
* HAMEHASH or the firstone if namehash is NULL. ret_n receives
* the length of the allocated buffer. Structure of the buffer is
* a repeated sequences of 2 bytes; where the first byte describes the
* type of the preference and the second one the value. The constants
* PREFTYPE_xxxx should be used to reference a type.
*/
byte *
get_pref_data( ulong lid, const byte *namehash, size_t *ret_n )
{
TRUSTREC rec;
ulong recno;
init_trustdb();
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;
init_trustdb();
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;
}
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