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gnupg/g10/trustdb.c
Werner Koch bc5789665a bug fixes
1998-02-11 23:22:09 +00:00

1990 lines
51 KiB
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/* trustdb.c
* Copyright (c) 1997 by Werner Koch (dd9jn)
*
* This file is part of G10.
*
* G10 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.
*
* G10 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 <unistd.h>
#include <errno.h>
#include <assert.h>
#include <fcntl.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"
#define TRUST_RECORD_LEN 40
#define SIGS_PER_RECORD ((TRUST_RECORD_LEN-10)/5)
#define ITEMS_PER_HTBL_RECORD ((TRUST_RECORD_LEN-2)/4)
#define ITEMS_PER_HLST_RECORD ((TRUST_RECORD_LEN-6)/5)
#define MAX_LIST_SIGS_DEPTH 20
#define RECTYPE_VER 1
#define RECTYPE_DIR 2
#define RECTYPE_KEY 3
#define RECTYPE_CTL 4
#define RECTYPE_SIG 5
#define RECTYPE_HTBL 6
#define RECTYPE_HLST 7
struct trust_record {
int rectype;
union {
struct { /* version record: */
byte version; /* should be 1 */
ulong locked; /* pid of process which holds a lock */
ulong created; /* timestamp of trustdb creation */
ulong modified; /* timestamp of last modification */
ulong validated; /* timestamp of last validation */
byte marginals_needed;
byte completes_needed;
byte max_cert_depth;
} ver;
struct { /* directory record */
ulong local_id;
u32 keyid[2];
ulong keyrec; /* recno of public key record */
ulong ctlrec; /* recno of control record */
ulong sigrec; /* recno of first signature record */
ulong link; /* to next dir record */
byte no_sigs; /* does not have sigature and checked */
} dir;
struct { /* public key record */
ulong owner;
u32 keyid[2];
byte pubkey_algo;
byte fingerprint[20];
byte ownertrust;
} key;
struct { /* control record */
ulong owner;
byte blockhash[20];
byte trustlevel; /* calculated trustlevel */
} ctl;
struct { /* signature record */
ulong owner; /* local_id of record owner (pubkey record) */
ulong chain; /* offset of next record or NULL for last one */
struct {
ulong local_id; /* of pubkey record of signator (0=unused) */
byte flag; /* reserved */
} sig[SIGS_PER_RECORD];
} sig;
struct {
ulong item[ITEMS_PER_HTBL_RECORD];
} htbl;
struct {
ulong chain;
struct {
byte hash;
ulong rnum;
} item[ITEMS_PER_HLST_RECORD];
} hlst;
} r;
};
typedef struct trust_record TRUSTREC;
typedef struct {
ulong local_id; /* localid of the pubkey */
ulong sigrec;
ulong sig_id; /* returned signature id */
unsigned sig_flag; /* returned signature record flag */
struct { /* internal data */
int init_done;
int eof;
TRUSTREC rec;
int index;
} ctl;
} SIGREC_CONTEXT;
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 void create_db( const char *fname );
static void open_db(void);
static void dump_record( ulong rnum, TRUSTREC *rec, FILE *fp );
static int read_record( ulong recnum, TRUSTREC *rec, int expected );
static int write_record( ulong recnum, TRUSTREC *rec );
static ulong new_recnum(void);
static int search_record( PKT_public_cert *pkc, TRUSTREC *rec );
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 list_sigs( ulong pubkey_id );
static int build_sigrecs( ulong pubkeyid );
static int propagate_trust( TRUST_SEG_LIST tslist );
static int do_check( ulong pubkeyid, TRUSTREC *drec, unsigned *trustlevel );
static int update_no_sigs( ulong lid, int no_sigs );
static char *db_name;
static int db_fd = -1;
/* 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 buftoulong( p ) ((*(byte*)(p) << 24) | (*((byte*)(p)+1)<< 16) | \
(*((byte*)(p)+2) << 8) | (*((byte*)(p)+3)))
#define buftoushort( p ) ((*((byte*)(p)) << 8) | (*((byte*)(p)+1)))
#define ulongtobuf( p, a ) do { \
((byte*)p)[0] = a >> 24; \
((byte*)p)[1] = a >> 16; \
((byte*)p)[2] = a >> 8; \
((byte*)p)[3] = a ; \
} while(0)
#define ushorttobuf( p, a ) do { \
((byte*)p)[0] = a >> 8; \
((byte*)p)[1] = a ; \
} while(0)
#define buftou32( p) buftoulong( (p) )
#define u32tobuf( p, a) ulongtobuf( (p), (a) )
/**************************************************
************** read and write helpers ************
**************************************************/
static void
fwrite_8(FILE *fp, byte a)
{
if( putc( a & 0xff, fp ) == EOF )
log_fatal("error writing byte to trustdb: %s\n", strerror(errno) );
}
static void
fwrite_32( FILE*fp, ulong a)
{
putc( (a>>24) & 0xff, fp );
putc( (a>>16) & 0xff, fp );
putc( (a>> 8) & 0xff, fp );
if( putc( a & 0xff, fp ) == EOF )
log_fatal("error writing ulong to trustdb: %s\n", strerror(errno) );
}
static void
fwrite_zeros( FILE *fp, size_t n)
{
while( n-- )
if( putc( 0, fp ) == EOF )
log_fatal("error writing zeros to trustdb: %s\n", strerror(errno) );
}
/**********************************************
************* 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 its 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();
}
/**************************************************
************** read and write stuff **************
**************************************************/
/****************
* Create a new trustdb
*/
static void
create_db( const char *fname )
{
FILE *fp;
fp =fopen( fname, "w" );
if( !fp )
log_fatal("can't create %s: %s\n", fname, strerror(errno) );
fwrite_8( fp, 1 );
fwrite_8( fp, 'g' );
fwrite_8( fp, '1' );
fwrite_8( fp, '0' );
fwrite_8( fp, 1 ); /* version */
fwrite_zeros( fp, 3 ); /* reserved */
fwrite_32( fp, 0 ); /* not locked */
fwrite_32( fp, make_timestamp() ); /* created */
fwrite_32( fp, 0 ); /* not yet modified */
fwrite_32( fp, 0 ); /* not yet validated*/
fwrite_32( fp, 0 ); /* reserved */
fwrite_8( fp, 3 ); /* marginals needed */
fwrite_8( fp, 1 ); /* completes needed */
fwrite_8( fp, 4 ); /* max_cet_depth */
fwrite_zeros( fp, 9 ); /* filler */
fclose(fp);
}
static void
open_db()
{
TRUSTREC rec;
assert( db_fd == -1 );
db_fd = open( db_name, O_RDWR );
if( db_fd == -1 )
log_fatal("can't open %s: %s\n", db_name, strerror(errno) );
if( read_record( 0, &rec, RECTYPE_VER ) )
log_fatal("TrustDB %s is invalid\n", db_name );
/* fixme: check ->locked and other stuff */
}
static void
dump_record( ulong rnum, TRUSTREC *rec, FILE *fp )
{
int i, any;
fprintf(fp, "trust record %lu, type=", rnum );
switch( rec->rectype ) {
case 0: fprintf(fp, "free\n");
break;
case RECTYPE_VER: fprintf(fp, "version\n");
break;
case RECTYPE_DIR:
fprintf(fp, "dir keyid=%08lX, key=%lu, ctl=%lu, sig=%lu",
(ulong)rec->r.dir.keyid[1],
rec->r.dir.keyrec, rec->r.dir.ctlrec, rec->r.dir.sigrec );
if( rec->r.dir.no_sigs == 1 )
fputs(", (none)", fp );
else if( rec->r.dir.no_sigs == 2 )
fputs(", (invalid)", fp );
else if( rec->r.dir.no_sigs )
fputs(", (revoked)", fp );
putc('\n', fp);
break;
case RECTYPE_KEY: fprintf(fp, "key keyid=%08lX, own=%lu, ownertrust=%02x\n",
(ulong)rec->r.key.keyid[1],
rec->r.key.owner, rec->r.key.ownertrust );
break;
case RECTYPE_CTL: fprintf(fp, "ctl\n");
break;
case RECTYPE_SIG:
fprintf(fp, "sigrec, owner=%lu, chain=%lu\n",
rec->r.sig.owner, rec->r.sig.chain );
for(i=any=0; i < SIGS_PER_RECORD; i++ ) {
if( rec->r.sig.sig[i].local_id ) {
if( !any ) {
putc('\t', fp);
any++;
}
fprintf(fp, " %lu:%02x", rec->r.sig.sig[i].local_id,
rec->r.sig.sig[i].flag );
}
}
if( any )
putc('\n', fp);
break;
default:
fprintf(fp, "%d (unknown)\n", rec->rectype );
break;
}
}
/****************
* read the record with number recnum
* returns: -1 on error, 0 on success
*/
static int
read_record( ulong recnum, TRUSTREC *rec, int expected )
{
byte buf[TRUST_RECORD_LEN], *p;
int rc = 0;
int n, i;
if( db_fd == -1 )
open_db();
if( lseek( db_fd, recnum * TRUST_RECORD_LEN, SEEK_SET ) == -1 ) {
log_error("trustdb: lseek failed: %s\n", strerror(errno) );
return G10ERR_READ_FILE;
}
n = read( db_fd, buf, TRUST_RECORD_LEN);
if( !n ) {
return -1; /* eof */
}
else if( n != TRUST_RECORD_LEN ) {
log_error("trustdb: read failed (n=%d): %s\n", n, strerror(errno) );
return G10ERR_READ_FILE;
}
p = buf;
rec->rectype = *p++;
if( expected && rec->rectype != expected ) {
log_error("%lu: read expected rec type %d, got %d\n",
recnum, expected, rec->rectype );
return G10ERR_TRUSTDB;
}
p++;
switch( rec->rectype ) {
case 0: /* unused record */
break;
case RECTYPE_VER: /* version record */
if( memcmp(buf+1, "g10", 3 ) ) {
log_error("%s: not a trustdb file\n", db_name );
rc = G10ERR_TRUSTDB;
}
p += 2; /* skip magic */
rec->r.ver.version = *p++;
rec->r.ver.locked = buftoulong(p); p += 4;
rec->r.ver.created = buftoulong(p); p += 4;
rec->r.ver.modified = buftoulong(p); p += 4;
rec->r.ver.validated= buftoulong(p); p += 4;
rec->r.ver.marginals_needed = *p++;
rec->r.ver.completes_needed = *p++;
rec->r.ver.max_cert_depth = *p++;
if( recnum ) {
log_error("%s: version record with recnum %lu\n",
db_name, (ulong)recnum );
rc = G10ERR_TRUSTDB;
}
if( rec->r.ver.version != 1 ) {
log_error("%s: invalid file version %d\n",
db_name, rec->r.ver.version );
rc = G10ERR_TRUSTDB;
}
break;
case RECTYPE_DIR: /*directory record */
rec->r.dir.local_id = buftoulong(p); p += 4;
rec->r.dir.keyid[0] = buftou32(p); p += 4;
rec->r.dir.keyid[1] = buftou32(p); p += 4;
rec->r.dir.keyrec = buftoulong(p); p += 4;
rec->r.dir.ctlrec = buftoulong(p); p += 4;
rec->r.dir.sigrec = buftoulong(p); p += 4;
rec->r.dir.no_sigs = *p++;
if( rec->r.dir.local_id != recnum ) {
log_error("%s: dir local_id != recnum (%lu,%lu)\n",
db_name,
(ulong)rec->r.dir.local_id,
(ulong)recnum );
rc = G10ERR_TRUSTDB;
}
break;
case RECTYPE_KEY: /* public key record */
rec->r.key.owner = buftoulong(p); p += 4;
rec->r.dir.keyid[0] = buftou32(p); p += 4;
rec->r.dir.keyid[1] = buftou32(p); p += 4;
rec->r.key.pubkey_algo = *p++; p++;
memcpy( rec->r.key.fingerprint, p, 20); p += 20;
rec->r.key.ownertrust = *p++;
break;
case RECTYPE_CTL: /* control record */
rec->r.ctl.owner = buftoulong(p); p += 4;
memcpy(rec->r.ctl.blockhash, p, 20); p += 20;
rec->r.ctl.trustlevel = *p++;
break;
case RECTYPE_SIG:
rec->r.sig.owner = buftoulong(p); p += 4;
rec->r.sig.chain = buftoulong(p); p += 4;
for(i=0; i < SIGS_PER_RECORD; i++ ) {
rec->r.sig.sig[i].local_id = buftoulong(p); p += 4;
rec->r.sig.sig[i].flag = *p++;
}
break;
default:
log_error("%s: invalid record type %d at recnum %lu\n",
db_name, rec->rectype, (ulong)recnum );
rc = G10ERR_TRUSTDB;
break;
}
return rc;
}
/****************
* Write the record at RECNUM
*/
static int
write_record( ulong recnum, TRUSTREC *rec )
{
byte buf[TRUST_RECORD_LEN], *p;
int rc = 0;
int i, n;
if( db_fd == -1 )
open_db();
memset(buf, 0, TRUST_RECORD_LEN);
p = buf;
*p++ = rec->rectype; p++;
switch( rec->rectype ) {
case 0: /* unused record */
break;
case 1: /* version record */
BUG();
break;
case RECTYPE_DIR: /*directory record */
ulongtobuf(p, rec->r.dir.local_id); p += 4;
u32tobuf(p, rec->r.key.keyid[0]); p += 4;
u32tobuf(p, rec->r.key.keyid[1]); p += 4;
ulongtobuf(p, rec->r.dir.keyrec); p += 4;
ulongtobuf(p, rec->r.dir.ctlrec); p += 4;
ulongtobuf(p, rec->r.dir.sigrec); p += 4;
*p++ = rec->r.dir.no_sigs;
assert( rec->r.dir.local_id == recnum );
break;
case RECTYPE_KEY:
ulongtobuf(p, rec->r.key.owner); p += 4;
u32tobuf(p, rec->r.key.keyid[0]); p += 4;
u32tobuf(p, rec->r.key.keyid[1]); p += 4;
*p++ = rec->r.key.pubkey_algo; p++;
memcpy( p, rec->r.key.fingerprint, 20); p += 20;
*p++ = rec->r.key.ownertrust;
break;
case RECTYPE_CTL: /* control record */
ulongtobuf(p, rec->r.ctl.owner); p += 4;
memcpy(p, rec->r.ctl.blockhash, 20); p += 20;
*p++ = rec->r.ctl.trustlevel;
break;
case RECTYPE_SIG:
ulongtobuf(p, rec->r.sig.owner); p += 4;
ulongtobuf(p, rec->r.sig.chain); p += 4;
for(i=0; i < SIGS_PER_RECORD; i++ ) {
ulongtobuf(p, rec->r.sig.sig[i].local_id); p += 4;
*p++ = rec->r.sig.sig[i].flag;
}
break;
default:
BUG();
}
if( lseek( db_fd, recnum * TRUST_RECORD_LEN, SEEK_SET ) == -1 ) {
log_error("trustdb: lseek failed: %s\n", strerror(errno) );
return G10ERR_WRITE_FILE;
}
n = write( db_fd, buf, TRUST_RECORD_LEN);
if( n != TRUST_RECORD_LEN ) {
log_error("trustdb: write failed (n=%d): %s\n", n, strerror(errno) );
return G10ERR_WRITE_FILE;
}
return rc;
}
/****************
* create a new record and return its record number
*/
static ulong
new_recnum()
{
off_t offset;
ulong recnum;
TRUSTREC rec;
int rc;
/* fixme: look for unused records */
offset = lseek( db_fd, 0, SEEK_END );
if( offset == -1 )
log_fatal("trustdb: lseek to end failed: %s\n", strerror(errno) );
recnum = offset / TRUST_RECORD_LEN;
assert(recnum); /* this is will never be the first record */
/* we must write a record, so that the next call to this function
* returns another recnum */
memset( &rec, 0, sizeof rec );
rec.rectype = 0; /* free record */
rc = write_record(recnum, &rec );
if( rc )
log_fatal("%s: failed to append a record: %s\n",
db_name, g10_errstr(rc));
return recnum ;
}
/****************
* Search the trustdb for a key which matches PKC and return the dir record
* The local_id of PKC is set to the correct value
*
* Note: To increase performance, we could use a index search here.
*/
static int
search_record( PKT_public_cert *pkc, TRUSTREC *rec )
{
ulong recnum;
u32 keyid[2];
byte *fingerprint;
size_t fingerlen;
int rc;
keyid_from_pkc( pkc, keyid );
fingerprint = fingerprint_from_pkc( pkc, &fingerlen );
assert( fingerlen == 20 || fingerlen == 16 );
for(recnum=1; !(rc=read_record( recnum, rec, 0)); recnum++ ) {
if( rec->rectype != RECTYPE_DIR )
continue;
if( rec->r.dir.keyid[0] == keyid[0]
&& rec->r.dir.keyid[1] == keyid[1]){
TRUSTREC keyrec;
if( read_record( rec->r.dir.keyrec, &keyrec, RECTYPE_KEY ) ) {
log_error("%lu: ooops: invalid key record\n", recnum );
break;
}
if( keyrec.r.key.pubkey_algo == pkc->pubkey_algo
&& !memcmp(keyrec.r.key.fingerprint, fingerprint, fingerlen) ){
if( pkc->local_id && pkc->local_id != recnum )
log_error("%s: found record, but local_id from mem does "
"not match recnum (%lu,%lu)\n", db_name,
(ulong)pkc->local_id, (ulong)recnum );
pkc->local_id = recnum;
return 0;
}
}
}
if( rc != -1 )
log_error("%s: search_db failed: %s\n",db_name, g10_errstr(rc) );
return rc;
}
/****************
* If we do not have a local_id in a signature packet, find the owner of
* the signature packet in our trustdb or insert him into the trustdb
*/
static int
set_signature_packets_local_id( PKT_signature *sig )
{
PKT_public_cert *pkc = m_alloc_clear( sizeof *pkc );
TRUSTREC rec;
int rc;
rc = get_pubkey( pkc, sig->keyid );
if( rc)
goto leave;
if( !pkc->local_id ) {
rc = search_record( pkc, &rec );
if( rc == -1 )
rc = insert_trust_record( pkc );
if( rc )
goto leave;
/* fixme: we should propagate the local_id to all copies of the PKC */
}
sig->local_id = pkc->local_id;
leave:
free_public_cert( pkc );
return rc;
}
static int
keyid_from_local_id( ulong lid, u32 *keyid )
{
TRUSTREC rec;
int rc;
rc = read_record( lid, &rec, RECTYPE_DIR );
if( rc ) {
log_error("error reading record with local_id %lu: %s\n",
lid, g10_errstr(rc));
return G10ERR_TRUSTDB;
}
if( rec.rectype != RECTYPE_DIR ) {
log_error("record with local_id %lu is not a dir record\n", lid);
return G10ERR_TRUSTDB;
}
keyid[0] = rec.r.dir.keyid[0];
keyid[1] = rec.r.dir.keyid[1];
return 0;
}
/****************
* Walk throug 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;
if( !c->sigrec ) {
rc = read_record( c->local_id, r, RECTYPE_DIR );
if( rc ) {
log_error("%lu: error reading dir record: %s\n",
c->local_id, g10_errstr(rc));
return rc;
}
c->sigrec = r->r.dir.sigrec;
if( !c->sigrec && create && !r->r.dir.no_sigs ) {
rc = build_sigrecs( c->local_id );
if( rc ) {
if( rc == G10ERR_BAD_CERT )
rc = -1; /* maybe no selcficnature */
if( rc != -1 )
log_info("%lu: error building sigs on the fly: %s\n",
c->local_id, g10_errstr(rc) );
c->ctl.eof = 1;
return rc;
}
rc = read_record( c->local_id, r, RECTYPE_DIR );
if( rc ) {
log_error("%lu: error re-reading dir record: %s\n",
c->local_id, g10_errstr(rc));
return rc;
}
c->sigrec = r->r.dir.sigrec;
}
if( !c->sigrec ) {
c->ctl.eof = 1;
return -1;
}
}
/* force a read */
c->ctl.index = SIGS_PER_RECORD;
r->r.sig.chain = c->sigrec;
}
/* enter loop to skip deleted sigs */
do {
if( c->ctl.index >= SIGS_PER_RECORD ) {
/* read the record */
rnum = r->r.sig.chain;
if( !rnum ) {
c->ctl.eof = 1;
return -1; /* return eof */
}
rc = 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.owner != c->local_id ) {
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++].local_id );
c->sig_id = r->r.sig.sig[c->ctl.index-1].local_id;
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_certs()
{
int rc;
void *enum_context = NULL;
PKT_secret_cert *skc = m_alloc_clear( sizeof *skc );
PKT_public_cert *pkc = m_alloc_clear( sizeof *pkc );
u32 keyid[2];
while( !(rc=enum_secret_keys( &enum_context, skc) ) ) {
/* fixed: to be sure that it is a secret key of our own,
* we should check it, but this needs a passphrase
* for every key and this boring for the user.
* Solution: Sign the secring and the trustring
* and verify this signature during
* startup
*/
keyid_from_skc( skc, keyid );
if( DBG_TRUST )
log_debug("checking secret key %08lX\n", (ulong)keyid[1] );
/* look wether we can access the public key of this secret key */
rc = get_pubkey( pkc, keyid );
if( rc ) {
log_error("keyid %08lX: secret key without public key\n",
(ulong)keyid[1] );
goto leave;
}
if( cmp_public_secret_cert( pkc, skc ) ) {
log_error("keyid %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( pkc );
if( rc == -1 ) { /* put it into the trustdb */
rc = insert_trust_record( pkc );
if( rc ) {
log_error("keyid %08lX: can't put it into the trustdb\n",
(ulong)keyid[1] );
goto leave;
}
}
else if( rc ) {
log_error("keyid %08lX: query record failed\n", (ulong)keyid[1] );
goto leave;
}
if( DBG_TRUST )
log_debug("putting %08lX(%lu) into ultikey_table\n",
(ulong)keyid[1], pkc->local_id );
if( ins_lid_table_item( ultikey_table, pkc->local_id, 0 ) )
log_error("keyid %08lX: already in ultikey_table\n",
(ulong)keyid[1]);
release_secret_cert_parts( skc );
release_public_cert_parts( pkc );
}
if( rc != -1 )
log_error("enum_secret_keys failed: %s\n", g10_errstr(rc) );
else
rc = 0;
leave:
free_secret_cert( skc );
free_public_cert( pkc );
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 );
putchar('\"');
putchar('\n');
m_free(p);
}
/* (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.local_id = pubkey;
for(;;) {
rc = walk_sigrecs( &sx, 0 );
if( rc )
break;
rc = keyid_from_local_id( sx.sig_id, keyid );
if( rc ) {
printf("%6u: %*s????????(%lu:%02x)\n", *lineno, depth*4, "",
sx.sig_id, sx.sig_flag );
++*lineno;
}
else {
printf("%6u: %*s%08lX(%lu:%02x) ", *lineno, depth*4, "",
(ulong)keyid[1], sx.sig_id, sx.sig_flag );
/* check wether we already checked this pubkey */
if( !qry_lid_table_flag( ultikey_table, sx.sig_id, NULL ) ) {
print_user_id("[ultimately trusted]", keyid);
++*lineno;
}
else if( sx.sig_id == pubkey ) {
printf("[self-signature]\n");
++*lineno;
}
else if( sx.sig_id == root ) {
printf("[closed]\n");
++*lineno;
}
else if( ins_lid_table_item( lids, sx.sig_id, *lineno ) ) {
unsigned refline;
qry_lid_table_flag( lids, sx.sig_id, &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_id, 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_local_id( pubkey_id, keyid );
if( rc ) {
log_error("Hmmm, no pubkey record for local_id %lu\n", pubkey_id);
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;
}
/****************
* 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: to deeply nested\n", stack[depth-1], depth);*/
return 0;
}
memset( &sx, 0, sizeof sx );
sx.local_id = 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_id;
stack[depth].trust = 0;
if( qry_lid_table_flag( lids, sx.sig_id, &last_depth) ) {
/*printf("%2lu/%d: marked\n", sx.sig_id, depth );*/
ins_lid_table_item( lids, sx.sig_id, depth);
last_depth = depth;
}
else if( depth < last_depth ) {
/*printf("%2lu/%d: last_depth=%u - updated\n", sx.sig_id, depth, last_depth);*/
last_depth = depth;
upd_lid_table_flag( lids, sx.sig_id, depth);
}
if( last_depth < depth )
/*printf("%2lu/%d: already visited\n", sx.sig_id, depth)*/;
else if( !qry_lid_table_flag( ultikey_table, sx.sig_id, 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_id, depth);*/
}
else {
rc = do_list_path( stack, depth+1, max_depth, lids, tslist);
if( rc && rc != -1 )
break;
}
}
return rc==-1? 0 : rc;
}
/****************
* Check all the sigs of the given keyblock and mark them
* as checked. Valid signatures which are duplicates are
* also marked [shall we check them at all?]
* FIXME: what shall we do if we have duplicate signatures were only
* some of them are bad?
*/
static int
check_sigs( KBNODE keyblock, int *selfsig_okay )
{
KBNODE kbctx;
KBNODE node;
int rc;
LOCAL_ID_INFO *dups = NULL;
*selfsig_okay = 0;
for( kbctx=NULL; (node=walk_kbnode( keyblock, &kbctx,0)) ; ) {
if( node->pkt->pkttype == PKT_SIGNATURE
&& (node->pkt->pkt.signature->sig_class&~3) == 0x10 ) {
int selfsig;
rc = check_key_signature( keyblock, node, &selfsig );
if( !rc ) {
rc = set_signature_packets_local_id( node->pkt->pkt.signature );
if( rc )
log_fatal("set_signature_packets_local_id failed: %s\n",
g10_errstr(rc));
if( selfsig ) {
node->flag |= 2; /* mark signature valid */
*selfsig_okay = 1;
}
else
node->flag |= 1; /* mark signature valid */
if( !dups )
dups = new_lid_table();
if( ins_lid_table_item( dups,
node->pkt->pkt.signature->local_id, 0) )
node->flag |= 4; /* mark as duplicate */
}
if( DBG_TRUST )
log_debug("trustdb: sig from %08lX(%lu): %s%s\n",
(ulong)node->pkt->pkt.signature->keyid[1],
node->pkt->pkt.signature->local_id,
g10_errstr(rc), (node->flag&4)?" (dup)":"" );
}
}
if( dups )
release_lid_table(dups);
return 0;
}
/****************
* If we do not have sigrecs for the given key, build them and write them
* to the trustdb
*/
static int
build_sigrecs( ulong pubkeyid )
{
TRUSTREC rec, krec, rec2;
PUBKEY_FIND_INFO finfo=NULL;
KBPOS kbpos;
KBNODE keyblock = NULL;
KBNODE kbctx;
KBNODE node;
int rc=0;
int i, selfsig;
ulong rnum, rnum2;
ulong first_sigrec = 0;
if( DBG_TRUST )
log_debug("trustdb: build_sigrecs for pubkey %lu\n", (ulong)pubkeyid );
/* get the keyblock */
if( (rc=read_record( pubkeyid, &rec, RECTYPE_DIR )) ) {
log_error("%lu: build_sigrecs: can't read dir record\n", pubkeyid );
goto leave;
}
finfo = m_alloc_clear( sizeof *finfo );
finfo->keyid[0] = rec.r.dir.keyid[0];
finfo->keyid[1] = rec.r.dir.keyid[1];
if( (rc=read_record( rec.r.dir.keyrec, &krec, RECTYPE_KEY )) ) {
log_error("%lu: build_sigrecs: can't read key record\n", pubkeyid);
goto leave;
}
finfo->pubkey_algo = krec.r.key.pubkey_algo;
memcpy( finfo->fingerprint, krec.r.key.fingerprint, 20);
rc = find_keyblock( finfo, &kbpos );
if( rc ) {
log_error("build_sigrecs: find_keyblock failed\n" );
goto leave;
}
rc = read_keyblock( &kbpos, &keyblock );
if( rc ) {
log_error("build_sigrecs: read_keyblock failed\n" );
goto leave;
}
/* check all key signatures */
rc = check_sigs( keyblock, &selfsig );
if( rc ) {
log_error("build_sigrecs: check_sigs failed\n" );
goto leave;
}
if( !selfsig ) {
log_error("build_sigrecs: self-certificate missing\n" );
update_no_sigs( pubkeyid, 2 );
rc = G10ERR_BAD_CERT;
goto leave;
}
update_no_sigs( pubkeyid, 0 ); /* assume we have sigs */
/* valid key signatures are now marked; we can now build the
* sigrecs */
memset( &rec, 0, sizeof rec );
rec.rectype = RECTYPE_SIG;
i = 0;
rnum = rnum2 = 0;
for( kbctx=NULL; (node=walk_kbnode( keyblock, &kbctx, 0)) ; ) {
/* insert sigs which are not a selfsig nor a duplicate */
if( (node->flag & 1) && !(node->flag & 4) ) {
assert( node->pkt->pkttype == PKT_SIGNATURE );
if( !node->pkt->pkt.signature->local_id ) {
/* the next function should always succeed, because
* we have already checked the signature, and for this
* it was necessary to have the pubkey. The only reason
* this can fail are I/o errors of the trustdb or a
* remove operation on the pubkey database - which should
* not disturb us, because we have to chace them anyway. */
rc = set_signature_packets_local_id( node->pkt->pkt.signature );
if( rc )
log_fatal("set_signature_packets_local_id failed: %s\n",
g10_errstr(rc));
}
if( i == SIGS_PER_RECORD ) {
/* write the record */
rnum = new_recnum();
if( rnum2 ) { /* write the stored record */
rec2.r.sig.owner = pubkeyid;
rec2.r.sig.chain = rnum; /* the next record number */
rc = write_record( rnum2, &rec2 );
if( rc ) {
log_error("build_sigrecs: write_record failed\n" );
goto leave;
}
if( !first_sigrec )
first_sigrec = rnum2;
}
rec2 = rec;
rnum2 = rnum;
memset( &rec, 0, sizeof rec );
rec.rectype = RECTYPE_SIG;
i = 0;
}
rec.r.sig.sig[i].local_id = node->pkt->pkt.signature->local_id;
rec.r.sig.sig[i].flag = 0;
i++;
}
}
if( i || rnum2 ) {
/* write the record */
rnum = new_recnum();
if( rnum2 ) { /* write the stored record */
rec2.r.sig.owner = pubkeyid;
rec2.r.sig.chain = rnum;
rc = write_record( rnum2, &rec2 );
if( rc ) {
log_error("build_sigrecs: write_record failed\n" );
goto leave;
}
if( !first_sigrec )
first_sigrec = rnum2;
}
if( i ) { /* write the pending record */
rec.r.sig.owner = pubkeyid;
rec.r.sig.chain = 0;
rc = write_record( rnum, &rec );
if( rc ) {
log_error("build_sigrecs: write_record failed\n" );
goto leave;
}
if( !first_sigrec )
first_sigrec = rnum;
}
}
if( first_sigrec ) {
/* update the dir record */
if( (rc =read_record( pubkeyid, &rec, RECTYPE_DIR )) ) {
log_error("update_dir_record: read failed\n");
goto leave;
}
rec.r.dir.sigrec = first_sigrec;
if( (rc=write_record( pubkeyid, &rec )) ) {
log_error("update_dir_record: write failed\n");
goto leave;
}
}
else
update_no_sigs( pubkeyid, 1 ); /* no signatures */
leave:
m_free( finfo );
release_kbnode( keyblock );
if( DBG_TRUST )
log_debug("trustdb: build_sigrecs: %s\n", g10_errstr(rc) );
return rc;
}
/****************
* Make a list of trust paths
*/
static int
make_tsl( ulong pubkey_id, 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, pubkey_id, NULL ) ) {
tslist = m_alloc( sizeof *tslist );
tslist->nseg = 1;
tslist->dup = 0;
tslist->seg[0].lid = pubkey_id;
tslist->seg[0].trust = 0;
tslist->next = NULL;
rc = 0;
}
else {
stack[0].lid = pubkey_id;
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 thinks 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 a 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 but nothing more is known
* function may re-read dr.
*/
static int
do_check( ulong pubkeyid, 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;
assert( fully_needed > 0 && marginal_needed > 1 );
*trustlevel = TRUST_UNDEFINED;
/* verify the cache */
/* do we have sigrecs */
if( !dr->r.dir.sigrec && !dr->r.dir.no_sigs) {
/* no sigrecs, so build them */
rc = build_sigrecs( pubkeyid );
if( !rc ) /* and read again */
rc = read_record( pubkeyid, dr, RECTYPE_DIR );
}
if( !rc && !dr->r.dir.sigrec ) {
/* See wether this is our own key */
if( !qry_lid_table_flag( ultikey_table, pubkeyid, NULL ) ) {
*trustlevel = TRUST_ULTIMATE;
return 0;
}
else
rc = -1;
}
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( pubkeyid, &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("tslist segs:" );
for(i=0; i < tsl->nseg; i++ )
fprintf(stderr, " %lu/%02x", tsl->seg[i].lid,
tsl->seg[i].trust );
putc('\n',stderr);
}
}
/* and look wether 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 = 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 = TRUST_FULLY;
break;
}
}
if( !tsl && marginal >= marginal_needed )
*trustlevel = 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 = pubkeyid;
last_trust_web_tslist = tslist;
return 0;
}
/*********************************************************
**************** API Interface ************************
*********************************************************/
/****************
* 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 ) {
char *fname = dbname? m_strdup( dbname )
: make_filename("~/.g10", "trustdb.g10", NULL );
if( access( fname, R_OK ) ) {
if( errno != ENOENT ) {
log_error("can't access %s: %s\n", fname, strerror(errno) );
m_free(fname);
return G10ERR_TRUSTDB;
}
if( level )
create_db( fname );
}
m_free(db_name);
db_name = fname;
if( !level )
return 0;
/* we can verify a signature about our local data (secring and trustdb)
* in ~/.g10/ here */
rc = verify_private_data();
if( !rc ) {
/* verify, that our own certificates are in the trustDB
* or move them to the trustdb. */
rc = verify_own_certs();
/* should we check wether there is no other ultimately trusted
* key in the database? */
}
}
else
BUG();
return rc;
}
void
list_trustdb( const char *username )
{
TRUSTREC rec;
if( username ) {
PKT_public_cert *pkc = m_alloc_clear( sizeof *pkc );
int rc;
if( (rc = get_pubkey_byname( pkc, username )) )
log_error("user '%s' not found: %s\n", username, g10_errstr(rc) );
else if( (rc=search_record( pkc, &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_sigs( pkc->local_id )) )
log_error("user '%s' list problem: %s\n", username, g10_errstr(rc));
free_public_cert( pkc );
}
else {
ulong recnum;
int i;
printf("TrustDB: %s\n", db_name );
for(i=9+strlen(db_name); i > 0; i-- )
putchar('-');
putchar('\n');
for(recnum=0; !read_record( recnum, &rec, 0); recnum++ )
dump_record( recnum, &rec, stdout );
}
}
void
list_trust_path( int max_depth, const char *username )
{
int rc;
int wipe=0;
int i;
TRUSTREC rec;
PKT_public_cert *pkc = m_alloc_clear( sizeof *pkc );
if( max_depth < 0 ) {
wipe = 1;
max_depth = -max_depth;
}
if( (rc = get_pubkey_byname( pkc, username )) )
log_error("user '%s' not found: %s\n", username, g10_errstr(rc) );
else if( (rc=search_record( pkc, &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( pkc );
if( rc )
log_error("failed to put '%s' into trustdb: %s\n", username, g10_errstr(rc));
else {
assert( pkc->local_id );
}
}
if( !rc ) {
TRUST_SEG_LIST tsl, tslist = NULL;
if( !qry_lid_table_flag( ultikey_table, pkc->local_id, NULL ) ) {
tslist = m_alloc( sizeof *tslist );
tslist->nseg = 1;
tslist->dup = 0;
tslist->seg[0].lid = pkc->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 = pkc->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++ )
printf(" %lu/%02x", tsl->seg[i].lid, tsl->seg[i].trust );
putchar('\n');
}
}
free_public_cert( pkc );
}
/****************
* Get the trustlevel for this PKC.
* Note: This does not ask any questions
* Returns: 0 okay of an errorcode
*
* It operates this way:
* locate the pkc 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:
* Return with a trustlevel, saying that we do not have
* a trust record for it. The caller may use insert_trust_record()
* and then call this function here 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_cert *pkc, unsigned *r_trustlevel )
{
TRUSTREC rec;
unsigned trustlevel = TRUST_UNKNOWN;
int rc=0;
if( DBG_TRUST )
log_info("check_trust() called.\n");
/* get the pubkey record */
if( pkc->local_id ) {
if( read_record( pkc->local_id, &rec, RECTYPE_DIR ) ) {
log_error("check_trust: read record failed\n");
return G10ERR_TRUSTDB;
}
}
else { /* no local_id: scan the trustdb */
if( (rc=search_record( pkc, &rec )) && rc != -1 ) {
log_error("check_trust: search_record failed: %s\n",
g10_errstr(rc));
return rc;
}
else if( rc == -1 ) {
rc = insert_trust_record( pkc );
if( rc ) {
log_error("failed to insert pubkey into trustdb: %s\n",
g10_errstr(rc));
goto leave;
}
log_info("pubkey not in trustdb - inserted as %lu\n",
pkc->local_id );
}
}
/* fixme: do some additional checks on the pubkey record */
rc = do_check( pkc->local_id, &rec, &trustlevel );
if( rc ) {
log_error("check_trust: do_check failed: %s\n", g10_errstr(rc));
return rc;
}
leave:
if( DBG_TRUST )
log_info("check_trust() returns trustlevel %04x.\n", trustlevel);
*r_trustlevel = trustlevel;
return 0;
}
/****************
* 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 it's 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 )
log_bug("enum_trust_web: nyi\n");
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( read_record( lid, &rec, RECTYPE_DIR ) ) {
log_error("get_ownertrust: read dir record failed\n");
return G10ERR_TRUSTDB;
}
if( read_record( rec.r.dir.keyrec, &rec, RECTYPE_KEY ) ) {
log_error("get_ownertrust: read key record failed\n");
return G10ERR_TRUSTDB;
}
if( r_otrust )
*r_otrust = rec.r.key.ownertrust;
return 0;
}
int
keyid_from_trustdb( ulong lid, u32 *keyid )
{
TRUSTREC rec;
if( read_record( lid, &rec, RECTYPE_DIR ) ) {
log_error("keyid_from_trustdb: read record failed\n");
return G10ERR_TRUSTDB;
}
if( keyid ) {
keyid[0] = rec.r.dir.keyid[0];
keyid[1] = rec.r.dir.keyid[1];
}
return 0;
}
/****************
* This function simply looks for the key in the trustdb
* and sets PKC->local_id.
* Return: 0 = found
* -1 = not found
* other = error
*/
int
query_trust_record( PKT_public_cert *pkc )
{
TRUSTREC rec;
int rc=0;
if( pkc->local_id ) {
if( read_record( pkc->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=search_record( pkc, &rec )) && rc != -1 ) {
log_error("query_trust_record: search_record failed: %s\n",
g10_errstr(rc));
return rc;
}
}
return rc;
}
/****************
* Insert a trust record into the TrustDB
* This function failes if this record already exists.
*/
int
insert_trust_record( PKT_public_cert *pkc )
{
TRUSTREC rec;
u32 keyid[2];
ulong knum, dnum;
byte *fingerprint;
size_t fingerlen;
if( pkc->local_id )
log_bug("pkc->local_id=%lu\n", (ulong)pkc->local_id );
keyid_from_pkc( pkc, keyid );
fingerprint = fingerprint_from_pkc( pkc, &fingerlen );
/* FIXME: check that we do not have this record. */
dnum = new_recnum();
knum = new_recnum();
/* build dir record */
memset( &rec, 0, sizeof rec );
rec.rectype = RECTYPE_DIR;
rec.r.dir.local_id = dnum;
rec.r.dir.keyid[0] = keyid[0];
rec.r.dir.keyid[1] = keyid[1];
rec.r.dir.keyrec = knum;
rec.r.dir.no_sigs = 0;
if( write_record( dnum, &rec ) ) {
log_error("writing dir record failed\n");
return G10ERR_TRUSTDB;
}
/* and the key record */
memset( &rec, 0, sizeof rec );
rec.rectype = RECTYPE_KEY;
rec.r.key.owner = dnum;
rec.r.key.keyid[0] = keyid[0];
rec.r.key.keyid[1] = keyid[1];
rec.r.key.pubkey_algo = pkc->pubkey_algo;
memcpy(rec.r.key.fingerprint, fingerprint, fingerlen );
rec.r.key.ownertrust = 0;
if( write_record( knum, &rec ) ) {
log_error("wrinting key record failed\n");
return G10ERR_TRUSTDB;
}
pkc->local_id = dnum;
return 0;
}
int
update_ownertrust( ulong lid, unsigned new_trust )
{
TRUSTREC rec;
ulong recnum;
if( read_record( lid, &rec, RECTYPE_DIR ) ) {
log_error("update_ownertrust: read dir failed\n");
return G10ERR_TRUSTDB;
}
recnum = rec.r.dir.keyrec;
if( read_record( recnum, &rec, RECTYPE_KEY ) ) {
log_error("update_ownertrust: read key failed\n");
return G10ERR_TRUSTDB;
}
/* check keyid, fingerprint etc ? */
rec.r.key.ownertrust = new_trust;
if( write_record( recnum, &rec ) ) {
log_error("update_ownertrust: write failed\n");
return G10ERR_TRUSTDB;
}
return 0;
}
/****************
* Kludge to prevent duplicate build_sigrecs() due to an invalid
* certificate (no selfsignature or something like this)
*/
static int
update_no_sigs( ulong lid, int no_sigs )
{
TRUSTREC rec;
if( read_record( lid, &rec, RECTYPE_DIR ) ) {
log_error("update_no_sigs: read failed\n");
return G10ERR_TRUSTDB;
}
rec.r.dir.no_sigs = no_sigs;
if( write_record( lid, &rec ) ) {
log_error("update_no_sigs: write failed\n");
return G10ERR_TRUSTDB;
}
return 0;
}
int
verify_private_data()
{
int rc = 0;
char *sigfile = make_filename("~/.g10", "sig", NULL );
if( access( sigfile, R_OK ) ) {
if( errno != ENOENT ) {
log_error("can't access %s: %s\n", sigfile, strerror(errno) );
rc = G10ERR_TRUSTDB;
goto leave;
}
log_info("private data signature missing; creating ...\n");
rc = sign_private_data();
if( rc ) {
log_error("error creating %s: %s\n", sigfile, g10_errstr(rc) );
goto leave;
}
}
/* FIXME: verify this signature */
leave:
m_free(sigfile);
return rc;
}
int
sign_private_data()
{
int rc;
char *sigfile = make_filename("~/.g10", "sig", NULL );
char *secring = make_filename("~/.g10", "secring.g10", NULL );
STRLIST list = NULL;
add_to_strlist( &list, db_name );
add_to_strlist( &list, secring );
rc = sign_file( list, 1, NULL, 0, NULL, sigfile);
m_free(sigfile);
m_free(secring);
free_strlist(list);
return rc;
}
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