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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
typedef struct local_id_info *LOCAL_ID_INFO;
struct local_id_info {
LOCAL_ID_INFO next;
ulong lid;
unsigned flag;
};
typedef struct trust_info TRUST_INFO;
struct trust_info {
ulong lid;
unsigned trust;
};
typedef struct trust_seg_list *TRUST_SEG_LIST;
struct trust_seg_list {
TRUST_SEG_LIST next;
int nseg; /* number of segmens */
int dup;
TRUST_INFO seg[1]; /* segment list */
};
typedef struct {
TRUST_SEG_LIST tsl;
int index;
} ENUM_TRUST_WEB_CONTEXT;
static int walk_sigrecs( SIGREC_CONTEXT *c, int create );
static LOCAL_ID_INFO *new_lid_table(void);
static void release_lid_table( LOCAL_ID_INFO *tbl );
static int ins_lid_table_item( LOCAL_ID_INFO *tbl, ulong lid, unsigned flag );
static int qry_lid_table_flag( LOCAL_ID_INFO *tbl, ulong lid, unsigned *flag );
static void upd_lid_table_flag( LOCAL_ID_INFO *tbl, ulong lid, unsigned flag );
static void print_user_id( const char *text, u32 *keyid );
static int do_list_path( TRUST_INFO *stack, int depth, int max_depth,
LOCAL_ID_INFO *lids, TRUST_SEG_LIST *tslist );
static int update_sigs_by_lid( ulong lid );
static int list_sigs( ulong pubkey_id );
static int propagate_trust( TRUST_SEG_LIST tslist );
static int do_check( TRUSTREC *drec, unsigned *trustlevel );
/* a table used to keep track of ultimately trusted keys
* which are the ones from our secrings */
static LOCAL_ID_INFO *ultikey_table;
static ulong last_trust_web_key;
static TRUST_SEG_LIST last_trust_web_tslist;
#define HEXTOBIN(a) ( (a) >= '0' && (a) <= '9' ? ((a)-'0') : \
(a) >= 'A' && (a) <= 'F' ? ((a)-'A'+10) : ((a)-'a'+10))
/**********************************************
************* list helpers *******************
**********************************************/
static LOCAL_ID_INFO *
new_lid_table(void)
{
return m_alloc_clear( 16 * sizeof(LOCAL_ID_INFO));
}
static void
release_lid_table( LOCAL_ID_INFO *tbl )
{
LOCAL_ID_INFO a, a2;
int i;
for(i=0; i < 16; i++ ) {
for(a=tbl[i]; a; a = a2 ) {
a2 = a->next;
m_free(a);
}
}
m_free(tbl);
}
/****************
* Add a new item to the table or return 1 if we already have this item
* fixme: maybe it's a good idea to take items from an unused item list.
*/
static int
ins_lid_table_item( LOCAL_ID_INFO *tbl, ulong lid, unsigned flag )
{
LOCAL_ID_INFO a;
for( a = tbl[lid & 0x0f]; a; a = a->next )
if( a->lid == lid )
return 1;
a = m_alloc( sizeof *a );
a->lid = lid;
a->flag = flag;
a->next = tbl[lid & 0x0f];
tbl[lid & 0x0f] = a;
return 0;
}
static int
qry_lid_table_flag( LOCAL_ID_INFO *tbl, ulong lid, unsigned *flag )
{
LOCAL_ID_INFO a;
for( a = tbl[lid & 0x0f]; a; a = a->next )
if( a->lid == lid ) {
if( flag )
*flag = a->flag;
return 0;
}
return -1;
}
static void
upd_lid_table_flag( LOCAL_ID_INFO *tbl, ulong lid, unsigned flag )
{
LOCAL_ID_INFO a;
for( a = tbl[lid & 0x0f]; a; a = a->next )
if( a->lid == lid ) {
a->flag = flag;
return;
}
BUG();
}
/****************
* If we do not have a local_id in a signature packet, find the owner of
* the signature packet in our trustdb or insert them into the trustdb
*/
static int
set_signature_packets_lid( PKT_signature *sig )
{
PKT_public_key *pk = m_alloc_clear( sizeof *pk );
TRUSTREC rec;
int rc;
rc = get_pubkey( pk, sig->keyid );
if( rc)
goto leave;
if( !pk->local_id ) {
rc = tdbio_search_dir_bypk( pk, &rec );
if( rc == -1 )
rc = insert_trust_record( pk );
if( rc )
goto leave;
}
sig->local_id = pk->local_id;
leave:
free_public_key( pk );
return rc;
}
/****************
* 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, RECTYPE_DIR );
if( rc ) {
log_error("error reading dir record for LID %lu: %s\n",
lid, g10_errstr(rc));
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;
}
/****************
* 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, int create )
{
int rc=0;
TRUSTREC *r;
ulong rnum;
if( c->ctl.eof )
return -1;
r = &c->ctl.rec;
if( !c->ctl.init_done ) {
c->ctl.init_done = 1;
rc = tdbio_read_record( c->lid, r, RECTYPE_DIR );
if( rc ) {
log_error("LID %lu: error reading dir record: %s\n",
c->lid, g10_errstr(rc));
return rc;
}
c->ctl.nextuid = r->r.dir.uidlist;
/* force a read (what a bad bad hack) */
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 */
rc = tdbio_read_record( c->ctl.nextuid, r, RECTYPE_UID );
if( rc ) {
log_error("error reading next uidrec: %s\n",
g10_errstr(rc));
c->ctl.eof = 1;
return rc;
}
if( !r->r.uid.siglist && create ) {
rc = update_sigs_by_lid( c->lid );
if( rc ) {
if( rc == G10ERR_BAD_CERT )
rc = -1; /* maybe no selfsignature */
if( rc != -1 )
log_info("LID %lu: "
"error building sigs on the fly: %s\n",
c->lid, g10_errstr(rc) );
c->ctl.eof = 1;
return rc;
}
rc = tdbio_read_record( c->ctl.nextuid, r, RECTYPE_UID );
if( rc ) {
log_error("LID %lu: error re-reading uid record: %s\n",
c->lid, g10_errstr(rc));
return rc;
}
}
c->ctl.nextuid = r->r.uid.next;
rnum = r->r.uid.siglist;
}
if( !rnum ) {
c->ctl.eof = 1;
return -1; /* return eof */
}
rc = tdbio_read_record( rnum, r, RECTYPE_SIG );
if( rc ) {
log_error(_("error reading sigrec: %s\n"), g10_errstr(rc));
c->ctl.eof = 1;
return rc;
}
if( r->r.sig.lid != c->lid ) {
log_error(_("chained sigrec %lu has a wrong owner\n"), rnum );
c->ctl.eof = 1;
return G10ERR_TRUSTDB;
}
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] );
/* 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_error(_("key %08lX: secret key without public key\n"),
(ulong)keyid[1] );
goto leave;
}
if( cmp_public_secret_key( pk, sk ) ) {
log_error(_("key %08lX: secret and public key don't match\n"),
(ulong)keyid[1] );
rc = G10ERR_GENERAL;
goto leave;
}
/* 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 leave;
}
}
else if( rc ) {
log_error(_("key %08lX: query record failed\n"), (ulong)keyid[1] );
goto leave;
}
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 ultikey_table\n"),
(ulong)keyid[1]);
release_secret_key_parts( sk );
release_public_key_parts( pk );
}
if( rc != -1 )
log_error(_("enum_secret_keys failed: %s\n"), g10_errstr(rc) );
else
rc = 0;
leave:
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);
}
static void
print_keyid( FILE *fp, ulong lid )
{
u32 ki[2];
if( keyid_from_lid( lid, ki ) )
fprintf(fp, "????????.%lu", lid );
else
fprintf(fp, "%08lX.%lu", (ulong)ki[1], lid );
}
static void
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;
}
putc(c, fp);
}
/* (a non-recursive algorithm would be easier) */
static int
do_list_sigs( ulong root, ulong pubkey, int depth,
LOCAL_ID_INFO *lids, unsigned *lineno )
{
SIGREC_CONTEXT sx;
int rc;
u32 keyid[2];
memset( &sx, 0, sizeof sx );
sx.lid = pubkey;
for(;;) {
rc = walk_sigrecs( &sx, 0 );
if( rc )
break;
rc = keyid_from_lid( sx.sig_lid, keyid );
if( rc ) {
printf("%6u: %*s????????.%lu:%02x\n", *lineno, depth*4, "",
sx.sig_lid, sx.sig_flag );
++*lineno;
}
else {
printf("%6u: %*s%08lX.%lu:%02x ", *lineno, depth*4, "",
(ulong)keyid[1], sx.sig_lid, sx.sig_flag );
/* check whether we already checked this pubkey */
if( !qry_lid_table_flag( ultikey_table, sx.sig_lid, NULL ) ) {
print_user_id("[ultimately trusted]", keyid);
++*lineno;
}
else if( sx.sig_lid == pubkey ) {
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_INFO *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, RECTYPE_KEY );
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;
}
/****************
* Function to collect all trustpaths
*/
static int
do_list_path( TRUST_INFO *stack, int depth, int max_depth,
LOCAL_ID_INFO *lids, TRUST_SEG_LIST *tslist )
{
SIGREC_CONTEXT sx;
unsigned last_depth;
int rc;
assert(depth);
/*printf("%2lu/%d: scrutinizig\n", stack[depth-1], depth);*/
if( depth >= max_depth || depth >= MAX_LIST_SIGS_DEPTH-1 ) {
/*printf("%2lu/%d: too deeply nested\n", stack[depth-1], depth);*/
return 0;
}
memset( &sx, 0, sizeof sx );
sx.lid = stack[depth-1].lid;
/* loop over all signatures. If we do not have any, try to create them */
while( !(rc = walk_sigrecs( &sx, 1 )) ) {
TRUST_SEG_LIST tsl, t2, tl;
int i;
stack[depth].lid = sx.sig_lid;
stack[depth].trust = 0;
if( qry_lid_table_flag( lids, sx.sig_lid, &last_depth) ) {
/*printf("%2lu/%d: marked\n", sx.sig_lid, depth );*/
ins_lid_table_item( lids, sx.sig_lid, depth);
last_depth = depth;
}
else if( depth < last_depth ) {
/*printf("%2lu/%d: last_depth=%u - updated\n", sx.sig_lid, depth, last_depth);*/
last_depth = depth;
upd_lid_table_flag( lids, sx.sig_lid, depth);
}
if( last_depth < depth )
/*printf("%2lu/%d: already visited\n", sx.sig_lid, depth)*/;
else if( !qry_lid_table_flag( ultikey_table, sx.sig_lid, NULL ) ) {
/* found end of path; store it, ordered by path length */
tsl = m_alloc( sizeof *tsl + depth*sizeof(TRUST_INFO) );
tsl->nseg = depth+1;
tsl->dup = 0;
for(i=0; i <= depth; i++ )
tsl->seg[i] = stack[i];
for(t2=*tslist,tl=NULL; t2; tl=t2, t2 = t2->next )
if( depth < t2->nseg )
break;
if( !tl ) {
tsl->next = t2;
*tslist = tsl;
}
else {
tsl->next = t2;
tl->next = tsl;
}
/*putchar('.'); fflush(stdout);*/
/*printf("%2lu/%d: found\n", sx.sig_lid, depth);*/
}
else {
rc = do_list_path( stack, depth+1, max_depth, lids, tslist);
if( rc && rc != -1 )
break;
}
}
return rc==-1? 0 : rc;
}
/****************
* find the uid record given the uid packet and the dir-record.
* Returns: 0 = found
* -1 = No such uid-record
* or other error
*/
static int
find_urec( TRUSTREC *dir, PKT_user_id *uid, TRUSTREC *urec )
{
byte nhash[20];
ulong recno;
int rc;
assert(dir->rectype == RECTYPE_DIR );
rmd160_hash_buffer( nhash, uid->name, uid->len );
for( recno=dir->r.dir.uidlist; recno; recno = urec->r.uid.next ) {
rc = tdbio_read_record( recno, urec, RECTYPE_UID );
if( rc )
return rc == -1 ? G10ERR_READ_FILE : rc;
if( !memcmp( nhash, urec->r.uid.namehash, 20 ) )
return 0;
}
return -1;
}
/****************
* Test whether zthe signature lid is already in the (in mem) list.
* Returns: True if it is a duplicate
*/
static int
test_dupsig( TRUSTREC *rec, ulong lid )
{
int i;
ulong alid;
for( ; rec; rec = rec->next ) {
for(i=0; i < SIGS_PER_RECORD && (alid = rec->r.sig.sig[i].lid); i++ )
if( alid == lid )
return 1;
}
return 0;
}
/****************
* release the sigrec from the uidlist
*/
static void
rel_uidsigs( TRUSTREC *urec )
{
TRUSTREC *r2, *rec;
assert( urec->rectype == RECTYPE_UID );
for(rec=urec->next ; rec; rec = r2 ) {
assert( rec->rectype == RECTYPE_SIG );
r2 = rec->next;
m_free( rec );
}
urec->next = NULL;
}
static int
no_selfsig_del( ulong lid, u32 *keyid, TRUSTREC *urec )
{
int rc;
log_error("key %08lX.%lu, uid %02X%02X: "
"no self-signature - user id removed\n",
(ulong)keyid[1], lid, urec->r.uid.namehash[18],
urec->r.uid.namehash[19] );
rel_uidsigs( urec );
rc = tdbio_delete_uidrec( lid, urec->recnum );
if( rc )
log_error("no_selfsig_del: delete_uid %lu failed: %s\n",
lid, g10_errstr(rc) );
return rc;
}
/****************
* Write the signature records from the in-mem list at urec
* (The sequence of signatures does not matter)
*/
static int
write_sigs_from_urec( ulong lid, u32 *keyid, TRUSTREC *urec )
{
int rc;
TRUSTREC *rec, srec;
ulong nextrecno;
ulong recno;
nextrecno = urec->r.uid.siglist;
urec->r.uid.siglist = 0; /* end of list marker */
for( rec = urec->next; rec; rec = rec->next ) {
assert( rec->rectype == RECTYPE_SIG );
if( nextrecno ) { /* read the sig record, so it can be reused */
rc = tdbio_read_record( nextrecno, &srec, RECTYPE_SIG );
if( rc ) {
log_error("write_sig_from_urec: read sigrecno %lu failed: %s\n",
nextrecno, g10_errstr(rc) );
return rc;
}
recno = nextrecno;
nextrecno = srec.r.sig.next;
}
else
recno = tdbio_new_recnum();
/* link together (the sequence of signatures does not matter) */
rec->r.sig.next = urec->r.uid.siglist;
urec->r.uid.siglist = recno;
rec->r.sig.lid = lid;
/* and write */
rec->recnum = recno;
rc = tdbio_write_record( rec );
if( rc ) {
log_error("write_sig_from_urec: write sigrecno %lu failed: %s\n",
recno, g10_errstr(rc) );
return rc;
}
}
/* write the urec back */
rc = tdbio_write_record( urec );
if( rc ) {
log_error("write_sig_from_urec: write urec %lu failed: %s\n",
urec->recnum, g10_errstr(rc) );
return rc;
}
/* delete remaining old sigrecords */
while( nextrecno ) {
rc = tdbio_read_record( nextrecno, &srec, RECTYPE_SIG );
if( rc ) {
log_error("write_sig_from_urec: read sigrecno %lu failed: %s\n",
nextrecno, g10_errstr(rc) );
return rc;
}
rc = tdbio_delete_record( nextrecno );
if( rc ) {
log_error("write_sig_from_urec: delete old %lu failed: %s\n",
nextrecno, g10_errstr(rc) );
return rc;
}
nextrecno = srec.r.sig.next;
}
return rc;
}
/****************
* If we do not have sigrecs for the given key, build them and write them
* to the trustdb
*/
static int
update_sigs( TRUSTREC *dir )
{
TRUSTREC *rec, krec;
TRUSTREC urec;
TRUSTREC *sigrec_list;
KBNODE keyblock = NULL;
KBNODE node;
int i, sigidx, have_urec ;
ulong lid = dir->r.dir.lid;
u32 keyid[2];
int miskey=0;
int rc=0;
if( DBG_TRUST )
log_debug("update_sigs for %lu\n", lid );
if( (rc=tdbio_read_record( dir->r.dir.keylist, &krec, RECTYPE_KEY )) ) {
log_error("update_sigs: can't read primary key for %lu\n", lid);
goto leave;
}
rc = get_keyblock_byfprint( &keyblock, krec.r.key.fingerprint,
krec.r.key.fingerprint_len );
if( rc ) {
log_error( "update_sigs: keyblock for %lu not found: %s\n",
lid, g10_errstr(rc) );
goto leave;
}
/* check all key signatures */
assert( keyblock->pkt->pkttype == PKT_PUBLIC_KEY );
have_urec = 0;
sigrec_list = NULL;
sigidx = 0;
for( node=keyblock; node; node = node->next ) {
if( node->pkt->pkttype == PKT_PUBLIC_KEY )
keyid_from_pk( node->pkt->pkt.public_key, keyid );
else if( node->pkt->pkttype == PKT_USER_ID ) {
if( have_urec && !(urec.mark & 1) ) {
if( (rc = no_selfsig_del(lid, keyid, &urec )) )
goto leave;
have_urec = 0;
}
if( have_urec ) {
rc = write_sigs_from_urec( lid, keyid, &urec );
if( rc )
goto leave;
rel_uidsigs( &urec );
}
rc = find_urec( dir, node->pkt->pkt.user_id, &urec );
urec.next = NULL;
urec.mark = 0;
have_urec = sigidx = 0;
if( rc == -1 ) {
log_info("update_sigs: new user id for %lu\n", lid );
/* fixme: we should add the new user id here */
}
else if( rc ) {
log_error("update_sigs: find_urec %lu failed: %s\n",
lid, g10_errstr(rc) );
goto leave;
}
else
have_urec = 1;
}
else if( have_urec && node->pkt->pkttype == PKT_SIGNATURE ) {
PKT_signature *sig = node->pkt->pkt.signature;
if( (sig->sig_class&~3) == 0x10 ) {
rc = check_key_signature( keyblock, node, &i );
if( rc == G10ERR_NO_PUBKEY ) {
log_info("key %08lX.%lu, uid %02X%02X: "
"no public key for signature %08lX\n",
(ulong)keyid[1], lid, urec.r.uid.namehash[18],
urec.r.uid.namehash[19], (ulong)sig->keyid[1] );
miskey = 1;
}
else if( rc )
log_error("key %08lX.%lu, uid %02X%02X: "
"invalid %ssignature: %s\n",
(ulong)keyid[1], lid, urec.r.uid.namehash[18],
urec.r.uid.namehash[19],
i?"self-":"",g10_errstr(rc));
else if( i ) /* mark that we have a valid selfsignature */
urec.mark |= 1;
else if( (rc = set_signature_packets_lid( sig )) )
log_error("key %08lX.%lu, uid %02X%02X: "
"can't get LID of signer: %s\n",
(ulong)keyid[1], lid, urec.r.uid.namehash[18],
urec.r.uid.namehash[19], g10_errstr(rc));
else if( !test_dupsig( urec.next, sig->local_id ) ) {
/* put the valid signature into a list */
rec = urec.next;
if( !rec || sigidx == SIGS_PER_RECORD ) {
rec = m_alloc_clear( sizeof *rec );
rec->rectype = RECTYPE_SIG;
rec->next = urec.next;
urec.next = rec;
sigidx = 0;
}
rec->r.sig.sig[sigidx].lid = sig->local_id;
rec->r.sig.sig[sigidx].flag = 0;
sigidx++;
if( DBG_TRUST )
log_debug("key %08lX.%lu, uid %02X%02X: "
"signed by LID %lu\n",
(ulong)keyid[1], lid, urec.r.uid.namehash[18],
urec.r.uid.namehash[19], sig->local_id);
}
else if( DBG_TRUST )
log_debug("key %08lX.%lu, uid %02X%02X: "
"duplicate signature by LID %lu\n",
(ulong)keyid[1], lid, urec.r.uid.namehash[18],
urec.r.uid.namehash[19], sig->local_id );
rc = 0;
}
else {
/* fixme: handle other sig classes here */
/* FIXME: Revocations!!! */
}
}
}
if( have_urec && !(urec.mark & 1) ) {
if( (rc = no_selfsig_del(lid, keyid, &urec )) )
goto leave;
have_urec = 0;
}
if( have_urec ) {
rc = write_sigs_from_urec( lid, keyid, &urec );
if( rc )
goto leave;
rel_uidsigs( &urec );
}
dir->r.dir.dirflags |= DIRF_CHECKED;
if( miskey )
dir->r.dir.dirflags |= DIRF_MISKEY;
else
dir->r.dir.dirflags &= ~DIRF_MISKEY;
rc = tdbio_write_record( dir );
if( rc ) {
log_error("update_sigs: write dir record failed: %s\n", g10_errstr(rc));
return rc;
}
leave:
/* fixme: need more cleanup in case of an error */
release_kbnode( keyblock );
if( DBG_TRUST )
log_debug("update_sigs for %lu: %s\n", lid, g10_errstr(rc) );
return rc;
}
static int
update_sigs_by_lid( ulong lid )
{
int rc;
TRUSTREC rec;
rc = tdbio_read_record( lid, &rec, RECTYPE_DIR );
if( rc ) {
log_error("LID %lu: error reading dir record: %s\n",
lid, g10_errstr(rc));
return rc;
}
if( !(rec.r.dir.dirflags & DIRF_CHECKED) )
rc = update_sigs( &rec );
return rc;
}
/****************
* Make a list of trust paths
*/
static int
make_tsl( ulong lid, TRUST_SEG_LIST *ret_tslist )
{
int i, rc;
LOCAL_ID_INFO *lids = new_lid_table();
TRUST_INFO stack[MAX_LIST_SIGS_DEPTH];
TRUST_SEG_LIST tsl, tslist;
int max_depth = 4;
tslist = *ret_tslist = NULL;
if( !qry_lid_table_flag( ultikey_table, lid, NULL ) ) {
tslist = m_alloc( sizeof *tslist );
tslist->nseg = 1;
tslist->dup = 0;
tslist->seg[0].lid = lid;
tslist->seg[0].trust = 0;
tslist->next = NULL;
rc = 0;
}
else {
stack[0].lid = lid;
stack[0].trust = 0;
rc = do_list_path( stack, 1, max_depth, lids, &tslist );
}
if( !rc ) { /* wipe out duplicates */
LOCAL_ID_INFO *work = new_lid_table();
for( tsl=tslist; tsl; tsl = tsl->next ) {
for(i=1; i < tsl->nseg-1; i++ ) {
if( ins_lid_table_item( work, tsl->seg[i].lid, 0 ) ) {
tsl->dup = 1; /* mark as duplicate */
break;
}
}
}
release_lid_table(work);
*ret_tslist = tslist;
}
else
; /* FIXME: release tslist */
release_lid_table(lids);
return rc;
}
/****************
* Given a trust segment list tslist, walk over all paths and fill in
* the trust information for each segment. What this function does is
* to assign a trustvalue to the first segment (which is the requested key)
* of each path.
*
* FIXME: We have to do more thinking here. e.g. we should never increase
* the trust value.
*
* Do not do it for duplicates.
*/
static int
propagate_trust( TRUST_SEG_LIST tslist )
{
int i, rc;
unsigned trust, tr;
TRUST_SEG_LIST tsl;
for(tsl = tslist; tsl; tsl = tsl->next ) {
if( tsl->dup )
continue;
assert( tsl->nseg );
/* the last segment is always an ultimately trusted one, so we can
* assign a fully trust to the next one */
i = tsl->nseg-1;
tsl->seg[i].trust = TRUST_ULTIMATE;
trust = TRUST_FULLY;
for(i-- ; i >= 0; i-- ) {
tsl->seg[i].trust = trust;
if( i > 0 ) {
/* get the trust of this pubkey */
rc = get_ownertrust( tsl->seg[i].lid, &tr );
if( rc )
return rc;
if( tr < trust )
trust = tr;
}
}
}
return 0;
}
/****************
* we have the pubkey record and all needed informations are in the trustdb
* but nothing more is known.
* (this function may re-read the dir record dr)
*/
static int
do_check( TRUSTREC *dr, unsigned *trustlevel )
{
int i, rc=0;
TRUST_SEG_LIST tsl, tsl2, tslist;
int marginal, fully;
int fully_needed = opt.completes_needed;
int marginal_needed = opt.marginals_needed;
unsigned tflags = 0;
assert( fully_needed > 0 && marginal_needed > 1 );
*trustlevel = TRUST_UNDEFINED;
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;
}
/* did we already check the signatures */
if( !(dr->r.dir.dirflags & DIRF_CHECKED) ) /* no - do it now */
rc = update_sigs( dr );
if( dr->r.dir.dirflags & DIRF_REVOKED )
tflags |= TRUST_FLAG_REVOKED;
#if 0
if( !rc && !dr->r.dir.siglist ) {
/* We do not have any signatures; check whether it is one of our
* secret keys */
if( !qry_lid_table_flag( ultikey_table, dr->r.dir.lid, NULL ) )
*trustlevel = tflags | TRUST_ULTIMATE;
return 0;
}
#endif
if( rc )
return rc; /* error while looking for sigrec or building sigrecs */
/* fixme: take it from the cache if it is valid */
/* Make a list of all possible trust-paths */
rc = make_tsl( dr->r.dir.lid, &tslist );
if( rc )
return rc;
rc = propagate_trust( tslist );
if( rc )
return rc;
for(tsl = tslist; tsl; tsl = tsl->next ) {
if( tsl->dup )
continue;
if( opt.verbose ) {
log_info("trust path:" );
for(i=0; i < tsl->nseg; i++ ) {
putc(' ',stderr);
print_keyid( stderr, tsl->seg[i].lid );
putc(':',stderr);
print_trust( stderr, tsl->seg[i].trust );
}
putc('\n',stderr);
}
}
/* and see whether there is a trusted path.
* We only have to look at the first segment, because
* propagate_trust has investigated all other segments */
marginal = fully = 0;
for(tsl = tslist; tsl; tsl = tsl->next ) {
if( tsl->dup )
continue;
if( tsl->seg[0].trust == TRUST_ULTIMATE ) {
*trustlevel = tflags | TRUST_ULTIMATE; /* our own key */
break;
}
if( tsl->seg[0].trust == TRUST_FULLY ) {
marginal++;
fully++;
}
else if( tsl->seg[0].trust == TRUST_MARGINAL )
marginal++;
if( fully >= fully_needed ) {
*trustlevel = tflags | TRUST_FULLY;
break;
}
}
if( !tsl && marginal >= marginal_needed )
*trustlevel = tflags | TRUST_MARGINAL;
/* cache the tslist */
if( last_trust_web_key ) {
for( tsl = last_trust_web_tslist; tsl; tsl = tsl2 ) {
tsl2 = tsl->next;
m_free(tsl);
}
}
last_trust_web_key = dr->r.dir.lid;
last_trust_web_tslist = tslist;
return 0;
}
/***********************************************
**************** API ************************
***********************************************/
/****************
* 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( pk, username )) )
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;
for(recnum=0; !tdbio_read_record( recnum, &rec, 0); recnum++ ) {
if( rec.rectype == RECTYPE_DIR ) {
if( !rec.r.dir.keylist ) {
log_error("Oops; 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" );
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 otrust 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;
rc = tdbio_write_record( &rec );
if( rc )
log_error_f(fname, "error updating otrust: %s\n",
g10_errstr(rc));
}
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);
}
void
list_trust_path( int max_depth, const char *username )
{
int rc;
int wipe=0;
int i;
TRUSTREC rec;
PKT_public_key *pk = m_alloc_clear( sizeof *pk );
if( max_depth < 0 ) {
wipe = 1;
max_depth = -max_depth;
}
if( (rc = get_pubkey_byname( pk, username )) )
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 );
}
}
if( !rc ) {
TRUST_SEG_LIST tsl, tslist = NULL;
if( !qry_lid_table_flag( ultikey_table, pk->local_id, NULL ) ) {
tslist = m_alloc( sizeof *tslist );
tslist->nseg = 1;
tslist->dup = 0;
tslist->seg[0].lid = pk->local_id;
tslist->seg[0].trust = 0;
tslist->next = NULL;
rc = 0;
}
else {
LOCAL_ID_INFO *lids = new_lid_table();
TRUST_INFO stack[MAX_LIST_SIGS_DEPTH];
stack[0].lid = pk->local_id;
stack[0].trust = 0;
rc = do_list_path( stack, 1, max_depth, lids, &tslist );
if( wipe ) { /* wipe out duplicates */
LOCAL_ID_INFO *work;
work = new_lid_table();
for( tsl=tslist; tsl; tsl = tsl->next ) {
for(i=1; i < tsl->nseg-1; i++ ) {
if( ins_lid_table_item( work, tsl->seg[i].lid, 0 ) ) {
tsl->dup = 1; /* mark as duplicate */
break;
}
}
}
release_lid_table(work);
}
release_lid_table(lids);
}
if( rc )
log_error("user '%s' list problem: %s\n", username, g10_errstr(rc));
rc = propagate_trust( tslist );
if( rc )
log_error("user '%s' trust problem: %s\n", username, g10_errstr(rc));
for(tsl = tslist; tsl; tsl = tsl->next ) {
int i;
if( tsl->dup )
continue;
printf("trust path:" );
for(i=0; i < tsl->nseg; i++ ) {
putc(' ',stdout);
print_keyid( stdout, tsl->seg[i].lid );
putc(':',stdout);
print_trust( stdout, tsl->seg[i].trust );
}
putchar('\n');
}
}
free_public_key( pk );
}
/****************
* Check the complete trustdb or only the entries for the given username
*/
void
check_trustdb( const char *username )
{
TRUSTREC rec;
int rc;
if( username && *username == '#' ) {
int rc;
ulong lid = atoi(username+1);
if( (rc = update_sigs_by_lid( lid )) )
log_error("lid %lu: check failed: %s\n",
lid, g10_errstr(rc));
else
log_info("lid %lu: checked: %s\n", lid, g10_errstr(rc));
}
else if( username ) {
PKT_public_key *pk = m_alloc_clear( sizeof *pk );
if( (rc = get_pubkey_byname( pk, username )) )
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 = update_sigs( &rec )) )
log_error("lid %lu: check failed: %s\n",
rec.recnum, g10_errstr(rc));
else
log_info("lid %lu: checked: %s\n", rec.recnum, g10_errstr(rc));
free_public_key( pk );
}
else {
ulong recnum;
for(recnum=0; !tdbio_read_record( recnum, &rec, 0); recnum++ ) {
if( rec.rectype == RECTYPE_DIR ) {
rc = update_sigs( &rec );
if( rc )
log_error("lid %lu: check failed: %s\n",
recnum, g10_errstr(rc) );
else
log_info("lid %lu: checked\n", recnum );
}
}
}
}
/****************
* 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 ) {
if( tdbio_read_record( pk->local_id, &rec, RECTYPE_DIR ) ) {
log_error("check_trust: read dir record failed\n");
return G10ERR_TRUSTDB;
}
}
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"),
keyid[1], g10_errstr(rc));
goto leave;
}
log_info(_("key %08lX.%lu: inserted into trustdb\n"),
keyid[1], pk->local_id );
/* and re-read the dir record */
if( tdbio_read_record( pk->local_id, &rec, RECTYPE_DIR ) ) {
log_error("check_trust: reread dir record failed\n");
return G10ERR_TRUSTDB;
}
}
}
cur_time = make_timestamp();
if( pk->timestamp > cur_time ) {
log_info(_("key %08lX.%lu: created in future "
"(time warp or clock problem)\n"),
keyid[1], pk->local_id );
return G10ERR_TIME_CONFLICT;
}
if( pk->valid_days && add_days_to_timestamp(pk->timestamp,
pk->valid_days) < cur_time ) {
log_info(_("key %08lX.%lu: expired at %s\n"),
keyid[1], pk->local_id,
strtimestamp( add_days_to_timestamp(pk->timestamp,
pk->valid_days)));
trustlevel = TRUST_EXPIRED;
}
else {
rc = do_check( &rec, &trustlevel );
if( rc ) {
log_error(_("key %08lX.%lu: trust check failed: %s\n"),
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.
*
* 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.
*/
int
enum_trust_web( void **context, ulong *lid )
{
ENUM_TRUST_WEB_CONTEXT *c = *context;
if( !c ) { /* make a new context */
c = m_alloc_clear( sizeof *c );
*context = c;
if( *lid == last_trust_web_key && last_trust_web_tslist )
c->tsl = last_trust_web_tslist;
else {
TRUST_SEG_LIST tsl, tsl2, tslist;
int rc;
rc = make_tsl( *lid, &tslist );
if( rc ) {
log_error("failed to build the TSL\n");
return rc;
}
/* cache the tslist, so that we do not need to free it */
if( last_trust_web_key ) {
for( tsl = last_trust_web_tslist; tsl; tsl = tsl2 ) {
tsl2 = tsl->next;
m_free(tsl);
}
}
last_trust_web_key = *lid;
last_trust_web_tslist = tslist;
c->tsl = last_trust_web_tslist;
}
c->index = 1;
}
if( !lid ) { /* free the context */
m_free( c );
*context = NULL;
return 0;
}
while( c->tsl ) {
if( !c->tsl->dup && c->index < c->tsl->nseg-1 ) {
*lid = c->tsl->seg[c->index].lid;
c->index++;
return 0;
}
c->index = 1;
c->tsl = c->tsl->next;
}
return -1; /* eof */
}
/****************
* Return the assigned ownertrust value for the given LID
*/
int
get_ownertrust( ulong lid, unsigned *r_otrust )
{
TRUSTREC rec;
if( tdbio_read_record( lid, &rec, RECTYPE_DIR ) ) {
log_error("get_ownertrust: read dir record failed\n");
return G10ERR_TRUSTDB;
}
if( r_otrust )
*r_otrust = rec.r.dir.ownertrust;
return 0;
}
int
get_ownertrust_info( ulong lid )
{
unsigned otrust;
int c;
if( get_ownertrust( lid, &otrust ) )
return '?';
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;
int rc;
if( tdbio_read_record( lid, &rec, RECTYPE_DIR ) ) {
log_error("get_pref_data: read dir record failed\n");
return NULL;
}
for( recno=rec.r.dir.uidlist; recno; recno = rec.r.uid.next ) {
rc = tdbio_read_record( recno, &rec, RECTYPE_UID );
if( rc ) {
log_error("get_pref_data: read uid record failed: %s\n",
g10_errstr(rc));
return NULL;
}
if( rec.r.uid.prefrec
&& ( !namehash || !memcmp(namehash, rec.r.uid.namehash, 20) )) {
byte *buf;
/* found the correct one or the first one */
rc = tdbio_read_record( rec.r.uid.prefrec, &rec, RECTYPE_PREF );
if( rc ) {
log_error("get_pref_data: read pref record failed: %s\n",
g10_errstr(rc));
return NULL;
}
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, rc;
byte *pref;
if( tdbio_read_record( lid, &rec, RECTYPE_DIR ) ) {
log_error("is_algo_in_prefs: read dir record failed\n");
return 0;
}
for( recno=rec.r.dir.uidlist; recno; recno = rec.r.uid.next ) {
rc = tdbio_read_record( recno, &rec, RECTYPE_UID );
if( rc ) {
log_error("is_algo_in_prefs: read uid record failed: %s\n",
g10_errstr(rc));
return 0;
}
if( rec.r.uid.prefrec ) {
rc = tdbio_read_record( rec.r.uid.prefrec, &rec, RECTYPE_PREF );
if( rc ) {
log_error("is_algo_in_prefs: read pref record failed: %s\n",
g10_errstr(rc));
return 0;
}
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;
}
/****************
* 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;
int rc=0;
if( pk->local_id ) {
if( tdbio_read_record( pk->local_id, &rec, RECTYPE_DIR ) ) {
log_error("query_trust_record: read record failed\n");
return G10ERR_TRUSTDB;
}
}
else { /* no local_id: scan the trustdb */
if( (rc=tdbio_search_dir_bypk( pk, &rec )) && rc != -1 ) {
log_error("query_trust_record: search_record failed: %s\n",
g10_errstr(rc));
return rc;
}
}
return rc;
}
int
clear_trust_checked_flag( PKT_public_key *pk )
{
TRUSTREC rec;
int rc;
if( !pk->local_id ) {
query_trust_record( pk );
if( !pk->local_id )
log_bug("clear_trust_checked_flag: Still no LID\n");
}
if( (rc=tdbio_read_record( pk->local_id, &rec, RECTYPE_DIR ))) {
log_error("clear_trust_checked_flag: read record failed: %s\n",
g10_errstr(rc));
return rc;
}
if( !(rec.r.dir.dirflags & DIRF_CHECKED) )
return 0;
/* reset the flag */
rec.r.dir.dirflags &= ~DIRF_CHECKED;
rc = tdbio_write_record( &rec );
if( rc ) {
log_error("clear_trust_checked_flag: write dir record failed: %s\n",
g10_errstr(rc));
return rc;
}
return 0;
}
/****************
* helper function for insert_trust_record()
*/
static void
rel_mem_uidnode( u32 *keyid, int err, TRUSTREC *rec )
{
TRUSTREC *r, *r2;
if( err )
log_error("key %08lX, uid %02X%02X: invalid user id - removed\n",
(ulong)keyid[1], rec->r.uid.namehash[18], rec->r.uid.namehash[19] );
for(r=rec->help_pref; r; r = r2 ) {
r2 = r->next;
m_free(r);
}
m_free(rec);
}
/****************
* Insert a trust record into the TrustDB
* This function fails if this record already exists.
*
* We build everything we can do at this point. We cannot build
* the sig records, because their LIDs are needed and we may not have them.
*/
int
insert_trust_record( PKT_public_key *orig_pk )
{
TRUSTREC dirrec, *rec, *rec2;
TRUSTREC *keylist_head, **keylist_tail, *keylist;
TRUSTREC *uidlist_head, **uidlist_tail, *uidlist;
KBNODE keyblock = NULL;
KBNODE node;
u32 keyid[2]; /* of primary key */
byte *fingerprint;
size_t fingerlen;
int rc = 0;
keylist_head = NULL; keylist_tail = &keylist_head; keylist = NULL;
uidlist_head = NULL; uidlist_tail = &uidlist_head; uidlist = NULL;
/* prepare dir record */
memset( &dirrec, 0, sizeof dirrec );
dirrec.rectype = RECTYPE_DIR;
if( orig_pk->local_id )
log_bug("pk->local_id=%lu\n", (ulong)orig_pk->local_id );
fingerprint = fingerprint_from_pk( orig_pk, NULL, &fingerlen );
/* fixme: assert that we do not have this record.
* we can do this by searching for the primary keyid
*/
/* 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;
}
/* build data structure as linked lists in memory */
keyid[0] = keyid[1] = 0;
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;
if( node->pkt->pkttype == PKT_PUBLIC_KEY ) {
if( keylist_head )
BUG(); /* more than one primary key */
keyid_from_pk( pk, keyid );
}
fingerprint = fingerprint_from_pk( pk, NULL, &fingerlen );
rec = m_alloc_clear( sizeof *rec );
rec->rectype = RECTYPE_KEY;
rec->r.key.pubkey_algo = pk->pubkey_algo;
rec->r.key.fingerprint_len = fingerlen;
memcpy(rec->r.key.fingerprint, fingerprint, fingerlen );
*keylist_tail = rec; keylist_tail = &rec->next;
}
else if( node->pkt->pkttype == PKT_USER_ID ) {
PKT_user_id *uid = node->pkt->pkt.user_id;
rec = m_alloc_clear( sizeof *rec );
rec->rectype = RECTYPE_UID;
rmd160_hash_buffer( rec->r.uid.namehash, uid->name, uid->len );
uidlist = rec;
*uidlist_tail = rec; uidlist_tail = &rec->next;
}
else if( node->pkt->pkttype == PKT_SIGNATURE ) {
PKT_signature *sig = node->pkt->pkt.signature;
if( keyid[0] == sig->keyid[0] && keyid[1] == sig->keyid[1]
&& (node->pkt->pkt.signature->sig_class&~3) == 0x10 ) {
/* must verify this selfsignature here, so that we can
* build the preference record and validate the uid record
*/
if( !uidlist ) {
log_error("key %08lX: self-signature without user id\n",
(ulong)keyid[1] );
}
else if( (rc = check_key_signature( keyblock, node, NULL ))) {
log_error("key %08lX, uid %02X%02X: "
"invalid self-signature: %s\n",
(ulong)keyid[1], uidlist->r.uid.namehash[18],
uidlist->r.uid.namehash[19], g10_errstr(rc) );
rc = 0;
}
else { /* build the prefrecord */
static struct {
sigsubpkttype_t subpkttype;
int preftype;
} prefs[] = {
{ SIGSUBPKT_PREF_SYM, PREFTYPE_SYM },
{ SIGSUBPKT_PREF_HASH, PREFTYPE_HASH },
{ SIGSUBPKT_PREF_COMPR, PREFTYPE_COMPR },
{ 0, 0 }
};
const byte *s;
size_t n;
int k, i;
assert(uidlist);
assert(!uidlist->help_pref);
uidlist->mark |= 1; /* mark valid */
i = 0;
for(k=0; prefs[k].subpkttype; k++ ) {
s = parse_sig_subpkt2( sig, prefs[k].subpkttype, &n );
if( s ) {
while( n ) {
if( !i || i >= ITEMS_PER_PREF_RECORD ) {
rec = m_alloc_clear( sizeof *rec );
rec->rectype = RECTYPE_PREF;
rec->next = uidlist->help_pref;
uidlist->help_pref = rec;
i = 0;
}
rec->r.pref.data[i++] = prefs[k].preftype;
rec->r.pref.data[i++] = *s++;
n--;
}
}
}
}
}
else if( 0 /* is revocation sig etc */ ) {
/* handle it here */
}
else { /* not a selfsignature */
}
}
}
/* delete all invalid marked userids and their preferences and sigs */
/* (ugly code - I know) */
while( (rec=uidlist_head) && !(rec->mark & 1) ) {
uidlist_head = rec->next;
rel_mem_uidnode(keyid, 1, rec);
}
for( ; rec; rec = rec->next ) {
if( rec->next && !(rec->next->mark & 1) ) {
TRUSTREC *r = rec->next;
rec->next = r->next;
rel_mem_uidnode(keyid, 1, r);
}
}
/* check that we have at least one userid */
if( !uidlist_head ) {
log_error("key %08lX: no user ids - rejected\n", (ulong)keyid[1] );
rc = G10ERR_BAD_CERT;
goto leave;
}
/* insert the record numbers to build the real (on disk) list */
/* fixme: should start a transaction here */
dirrec.recnum = tdbio_new_recnum();
dirrec.r.dir.lid = dirrec.recnum;
/* (list of keys) */
for(rec=keylist_head; rec; rec = rec->next ) {
rec->r.key.lid = dirrec.recnum;
rec->recnum = tdbio_new_recnum();
}
for(rec=keylist_head; rec; rec = rec->next )
rec->r.key.next = rec->next? rec->next->recnum : 0;
dirrec.r.dir.keylist = keylist_head->recnum;
/* (list of user ids) */
for(rec=uidlist_head; rec; rec = rec->next ) {
rec->r.uid.lid = dirrec.recnum;
rec->recnum = tdbio_new_recnum();
/* (preference records) */
if( rec->help_pref ) {
for( rec2 = rec->help_pref; rec2; rec2 = rec2->next ) {
rec2->r.pref.lid = dirrec.recnum;
rec2->recnum = tdbio_new_recnum();
}
for( rec2 = rec->help_pref; rec2->next; rec2 = rec2->next )
rec2->next->r.pref.next = rec2->recnum;
rec->r.uid.prefrec = rec2->recnum;
}
}
for(rec=uidlist_head; rec; rec = rec->next )
rec->r.uid.next = rec->next? rec->next->recnum : 0;
dirrec.r.dir.uidlist = uidlist_head->recnum;
/* write all records */
for(rec=keylist_head; rec; rec = rec->next ) {
assert( rec->rectype == RECTYPE_KEY );
if( tdbio_write_record( rec ) ) {
log_error("writing key record failed\n");
rc = G10ERR_TRUSTDB;
goto leave;
}
}
for(rec=uidlist_head; rec; rec = rec->next ) {
assert( rec->rectype == RECTYPE_UID );
if( tdbio_write_record( rec ) ) {
log_error("writing uid record failed\n");
rc = G10ERR_TRUSTDB;
goto leave;
}
for( rec2=rec->help_pref; rec2; rec2 = rec2->next ) {
assert( rec2->rectype == RECTYPE_PREF );
if( tdbio_write_record( rec2 ) ) {
log_error("writing pref record failed\n");
rc = G10ERR_TRUSTDB;
goto leave;
}
}
}
if( tdbio_write_record( &dirrec ) ) {
log_error("writing dir record failed\n");
return G10ERR_TRUSTDB;
}
/* and store the 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 *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;
}
}
leave:
for(rec=uidlist_head; rec; rec = rec2 ) {
rec2 = rec->next;
rel_mem_uidnode(NULL, 0, rec );
}
for(rec=keylist_head; rec; rec = rec2 ) {
rec2 = rec->next;
m_free(rec);
}
return rc;
}
int
update_ownertrust( ulong lid, unsigned new_trust )
{
TRUSTREC rec;
if( tdbio_read_record( lid, &rec, RECTYPE_DIR ) ) {
log_error("update_ownertrust: read dir failed\n");
return G10ERR_TRUSTDB;
}
rec.r.dir.ownertrust = new_trust;
if( tdbio_write_record( &rec ) ) {
log_error("update_ownertrust: write failed\n");
return G10ERR_TRUSTDB;
}
return 0;
}
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