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gnupg/g10/keyid.c
David Shaw f74282bee0 * misc.c (openpgp_pk_algo_usage): Default to allowing CERT for signing 
algorithms.

* keyedit.c (sign_uids): Don't request a signing key to make a
certification.

* keygen.c (do_add_key_flags): Force the certify flag on for all
primary keys, as the spec requires primary keys must be able to
certify (if nothing else, which key is going to issue the user ID
signature?)  (print_key_flags): Show certify flag.  (ask_key_flags,
ask_algo): Don't allow setting the C flag for subkeys.
	
* keyid.c (usagestr_from_pk), getkey.c (parse_key_usage): Distinguish
between a sign/certify key and a certify-only key.
2005-08-27 03:09:40 +00:00

758 lines
16 KiB
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/* keyid.c - key ID and fingerprint handling
* Copyright (C) 1998, 1999, 2000, 2001, 2003,
* 2004 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <time.h>
#include <assert.h>
#include "util.h"
#include "main.h"
#include "packet.h"
#include "options.h"
#include "mpi.h"
#include "keydb.h"
#include "i18n.h"
int
pubkey_letter( int algo )
{
switch( algo ) {
case PUBKEY_ALGO_RSA: return 'R' ;
case PUBKEY_ALGO_RSA_E: return 'r' ;
case PUBKEY_ALGO_RSA_S: return 's' ;
case PUBKEY_ALGO_ELGAMAL_E: return 'g';
case PUBKEY_ALGO_ELGAMAL: return 'G' ;
case PUBKEY_ALGO_DSA: return 'D' ;
default: return '?';
}
}
/* This function is useful for v4 fingerprints and v3 or v4 key
signing. */
void
hash_public_key( MD_HANDLE md, PKT_public_key *pk )
{
unsigned n=6;
unsigned nb[PUBKEY_MAX_NPKEY];
unsigned nn[PUBKEY_MAX_NPKEY];
byte *pp[PUBKEY_MAX_NPKEY];
int i;
int npkey = pubkey_get_npkey( pk->pubkey_algo );
/* Two extra bytes for the expiration date in v3 */
if(pk->version<4)
n+=2;
if(npkey==0 && pk->pkey[0] && mpi_is_opaque(pk->pkey[0]))
{
pp[0]=mpi_get_opaque(pk->pkey[0],&nn[0]);
n+=nn[0];
}
else
for(i=0; i < npkey; i++ )
{
nb[i] = mpi_get_nbits(pk->pkey[i]);
pp[i] = mpi_get_buffer( pk->pkey[i], nn+i, NULL );
n += 2 + nn[i];
}
md_putc( md, 0x99 ); /* ctb */
/* What does it mean if n is greater than than 0xFFFF ? */
md_putc( md, n >> 8 ); /* 2 byte length header */
md_putc( md, n );
md_putc( md, pk->version );
md_putc( md, pk->timestamp >> 24 );
md_putc( md, pk->timestamp >> 16 );
md_putc( md, pk->timestamp >> 8 );
md_putc( md, pk->timestamp );
if(pk->version<4)
{
u16 days=0;
if(pk->expiredate)
days=(u16)((pk->expiredate - pk->timestamp) / 86400L);
md_putc( md, days >> 8 );
md_putc( md, days );
}
md_putc( md, pk->pubkey_algo );
if(npkey==0 && pk->pkey[0] && mpi_is_opaque(pk->pkey[0]))
md_write(md,pp[0],nn[0]);
else
for(i=0; i < npkey; i++ )
{
md_putc( md, nb[i]>>8);
md_putc( md, nb[i] );
md_write( md, pp[i], nn[i] );
xfree(pp[i]);
}
}
static MD_HANDLE
do_fingerprint_md( PKT_public_key *pk )
{
MD_HANDLE md;
md = md_open( DIGEST_ALGO_SHA1, 0);
hash_public_key(md,pk);
md_final( md );
return md;
}
static MD_HANDLE
do_fingerprint_md_sk( PKT_secret_key *sk )
{
PKT_public_key pk;
int npkey = pubkey_get_npkey( sk->pubkey_algo ); /* npkey is correct! */
int i;
if(npkey==0)
return NULL;
pk.pubkey_algo = sk->pubkey_algo;
pk.version = sk->version;
pk.timestamp = sk->timestamp;
pk.expiredate = sk->expiredate;
pk.pubkey_algo = sk->pubkey_algo;
for( i=0; i < npkey; i++ )
pk.pkey[i] = sk->skey[i];
return do_fingerprint_md( &pk );
}
size_t
keystrlen(void)
{
switch(opt.keyid_format)
{
case KF_SHORT:
return 8;
case KF_LONG:
return 16;
case KF_0xSHORT:
return 10;
case KF_0xLONG:
return 18;
default:
BUG();
}
}
const char *
keystr(u32 *keyid)
{
static char keyid_str[19];
switch(opt.keyid_format)
{
case KF_SHORT:
sprintf(keyid_str,"%08lX",(ulong)keyid[1]);
break;
case KF_LONG:
if(keyid[0])
sprintf(keyid_str,"%08lX%08lX",(ulong)keyid[0],(ulong)keyid[1]);
else
sprintf(keyid_str,"%08lX",(ulong)keyid[1]);
break;
case KF_0xSHORT:
sprintf(keyid_str,"0x%08lX",(ulong)keyid[1]);
break;
case KF_0xLONG:
if(keyid[0])
sprintf(keyid_str,"0x%08lX%08lX",(ulong)keyid[0],(ulong)keyid[1]);
else
sprintf(keyid_str,"0x%08lX",(ulong)keyid[1]);
break;
default:
BUG();
}
return keyid_str;
}
const char *
keystr_from_pk(PKT_public_key *pk)
{
keyid_from_pk(pk,NULL);
return keystr(pk->keyid);
}
const char *
keystr_from_sk(PKT_secret_key *sk)
{
keyid_from_sk(sk,NULL);
return keystr(sk->keyid);
}
const char *
keystr_from_desc(KEYDB_SEARCH_DESC *desc)
{
switch(desc->mode)
{
case KEYDB_SEARCH_MODE_LONG_KID:
case KEYDB_SEARCH_MODE_SHORT_KID:
return keystr(desc->u.kid);
case KEYDB_SEARCH_MODE_FPR20:
{
u32 keyid[2];
keyid[0] = (unsigned char)desc->u.fpr[12] << 24
| (unsigned char)desc->u.fpr[13] << 16
| (unsigned char)desc->u.fpr[14] << 8
| (unsigned char)desc->u.fpr[15] ;
keyid[1] = (unsigned char)desc->u.fpr[16] << 24
| (unsigned char)desc->u.fpr[17] << 16
| (unsigned char)desc->u.fpr[18] << 8
| (unsigned char)desc->u.fpr[19] ;
return keystr(keyid);
}
case KEYDB_SEARCH_MODE_FPR16:
return "?v3 fpr?";
default:
BUG();
}
}
/****************
* Get the keyid from the secret key and put it into keyid
* if this is not NULL. Return the 32 low bits of the keyid.
*/
u32
keyid_from_sk( PKT_secret_key *sk, u32 *keyid )
{
u32 lowbits;
u32 dummy_keyid[2];
if( !keyid )
keyid = dummy_keyid;
if( sk->keyid[0] || sk->keyid[1] )
{
keyid[0] = sk->keyid[0];
keyid[1] = sk->keyid[1];
lowbits = keyid[1];
}
else if( sk->version < 4 )
{
if( is_RSA(sk->pubkey_algo) )
{
lowbits = pubkey_get_npkey(sk->pubkey_algo) ?
mpi_get_keyid( sk->skey[0], keyid ) : 0; /* take n */
sk->keyid[0]=keyid[0];
sk->keyid[1]=keyid[1];
}
else
sk->keyid[0]=sk->keyid[1]=keyid[0]=keyid[1]=lowbits=0xFFFFFFFF;
}
else
{
const byte *dp;
MD_HANDLE md;
md = do_fingerprint_md_sk(sk);
if(md)
{
dp = md_read( md, 0 );
keyid[0] = dp[12] << 24 | dp[13] << 16 | dp[14] << 8 | dp[15] ;
keyid[1] = dp[16] << 24 | dp[17] << 16 | dp[18] << 8 | dp[19] ;
lowbits = keyid[1];
md_close(md);
sk->keyid[0] = keyid[0];
sk->keyid[1] = keyid[1];
}
else
sk->keyid[0]=sk->keyid[1]=keyid[0]=keyid[1]=lowbits=0xFFFFFFFF;
}
return lowbits;
}
/****************
* Get the keyid from the public key and put it into keyid
* if this is not NULL. Return the 32 low bits of the keyid.
*/
u32
keyid_from_pk( PKT_public_key *pk, u32 *keyid )
{
u32 lowbits;
u32 dummy_keyid[2];
if( !keyid )
keyid = dummy_keyid;
if( pk->keyid[0] || pk->keyid[1] )
{
keyid[0] = pk->keyid[0];
keyid[1] = pk->keyid[1];
lowbits = keyid[1];
}
else if( pk->version < 4 )
{
if( is_RSA(pk->pubkey_algo) )
{
lowbits = pubkey_get_npkey(pk->pubkey_algo) ?
mpi_get_keyid( pk->pkey[0], keyid ) : 0 ; /* from n */
pk->keyid[0] = keyid[0];
pk->keyid[1] = keyid[1];
}
else
pk->keyid[0]=pk->keyid[1]=keyid[0]=keyid[1]=lowbits=0xFFFFFFFF;
}
else
{
const byte *dp;
MD_HANDLE md;
md = do_fingerprint_md(pk);
if(md)
{
dp = md_read( md, 0 );
keyid[0] = dp[12] << 24 | dp[13] << 16 | dp[14] << 8 | dp[15] ;
keyid[1] = dp[16] << 24 | dp[17] << 16 | dp[18] << 8 | dp[19] ;
lowbits = keyid[1];
md_close(md);
pk->keyid[0] = keyid[0];
pk->keyid[1] = keyid[1];
}
else
pk->keyid[0]=pk->keyid[1]=keyid[0]=keyid[1]=lowbits=0xFFFFFFFF;
}
return lowbits;
}
/****************
* Get the keyid from the fingerprint. This function is simple for most
* keys, but has to do a keylookup for old stayle keys.
*/
u32
keyid_from_fingerprint( const byte *fprint, size_t fprint_len, u32 *keyid )
{
u32 dummy_keyid[2];
if( !keyid )
keyid = dummy_keyid;
if( fprint_len != 20 ) {
/* This is special as we have to lookup the key first */
PKT_public_key pk;
int rc;
memset( &pk, 0, sizeof pk );
rc = get_pubkey_byfprint( &pk, fprint, fprint_len );
if( rc ) {
log_error("Oops: keyid_from_fingerprint: no pubkey\n");
keyid[0] = 0;
keyid[1] = 0;
}
else
keyid_from_pk( &pk, keyid );
}
else {
const byte *dp = fprint;
keyid[0] = dp[12] << 24 | dp[13] << 16 | dp[14] << 8 | dp[15] ;
keyid[1] = dp[16] << 24 | dp[17] << 16 | dp[18] << 8 | dp[19] ;
}
return keyid[1];
}
u32
keyid_from_sig( PKT_signature *sig, u32 *keyid )
{
if( keyid ) {
keyid[0] = sig->keyid[0];
keyid[1] = sig->keyid[1];
}
return sig->keyid[1];
}
byte *
namehash_from_uid(PKT_user_id *uid)
{
if(uid->namehash==NULL)
{
uid->namehash=xmalloc(20);
if(uid->attrib_data)
rmd160_hash_buffer(uid->namehash,uid->attrib_data,uid->attrib_len);
else
rmd160_hash_buffer(uid->namehash,uid->name,uid->len);
}
return uid->namehash;
}
/****************
* return the number of bits used in the pk
*/
unsigned
nbits_from_pk( PKT_public_key *pk )
{
return pubkey_nbits( pk->pubkey_algo, pk->pkey );
}
/****************
* return the number of bits used in the sk
*/
unsigned
nbits_from_sk( PKT_secret_key *sk )
{
return pubkey_nbits( sk->pubkey_algo, sk->skey );
}
static const char *
mk_datestr (char *buffer, time_t atime)
{
struct tm *tp;
if ( atime < 0 ) /* 32 bit time_t and after 2038-01-19 */
strcpy (buffer, "????" "-??" "-??"); /* mark this as invalid */
else {
tp = gmtime (&atime);
sprintf (buffer,"%04d-%02d-%02d",
1900+tp->tm_year, tp->tm_mon+1, tp->tm_mday );
}
return buffer;
}
/****************
* return a string with the creation date of the pk
* Note: this is alloced in a static buffer.
* Format is: yyyy-mm-dd
*/
const char *
datestr_from_pk( PKT_public_key *pk )
{
static char buffer[11+5];
time_t atime = pk->timestamp;
return mk_datestr (buffer, atime);
}
const char *
datestr_from_sk( PKT_secret_key *sk )
{
static char buffer[11+5];
time_t atime = sk->timestamp;
return mk_datestr (buffer, atime);
}
const char *
datestr_from_sig( PKT_signature *sig )
{
static char buffer[11+5];
time_t atime = sig->timestamp;
return mk_datestr (buffer, atime);
}
const char *
expirestr_from_pk( PKT_public_key *pk )
{
static char buffer[11+5];
time_t atime;
if( !pk->expiredate )
return _("never ");
atime = pk->expiredate;
return mk_datestr (buffer, atime);
}
const char *
expirestr_from_sk( PKT_secret_key *sk )
{
static char buffer[11+5];
time_t atime;
if( !sk->expiredate )
return _("never ");
atime = sk->expiredate;
return mk_datestr (buffer, atime);
}
const char *
expirestr_from_sig( PKT_signature *sig )
{
static char buffer[11+5];
time_t atime;
if(!sig->expiredate)
return _("never ");
atime=sig->expiredate;
return mk_datestr (buffer, atime);
}
const char *
revokestr_from_pk( PKT_public_key *pk )
{
static char buffer[11+5];
time_t atime;
if(!pk->revoked.date)
return _("never ");
atime=pk->revoked.date;
return mk_datestr (buffer, atime);
}
const char *
usagestr_from_pk( PKT_public_key *pk )
{
static char buffer[10];
int i = 0;
unsigned int use = pk->pubkey_usage;
if ( use & PUBKEY_USAGE_SIG )
{
if (pk->is_primary)
use|=PUBKEY_USAGE_CERT;
buffer[i++] = 'S';
}
if ( use & PUBKEY_USAGE_CERT )
buffer[i++] = 'C';
if ( use & PUBKEY_USAGE_ENC )
buffer[i++] = 'E';
if ( (use & PUBKEY_USAGE_AUTH) )
buffer[i++] = 'A';
while (i < 4)
buffer[i++] = ' ';
buffer[i] = 0;
return buffer;
}
const char *
colon_strtime (u32 t)
{
if (!t)
return "";
if (opt.fixed_list_mode) {
static char buf[15];
sprintf (buf, "%lu", (ulong)t);
return buf;
}
return strtimestamp(t);
}
const char *
colon_datestr_from_pk (PKT_public_key *pk)
{
if (opt.fixed_list_mode) {
static char buf[15];
sprintf (buf, "%lu", (ulong)pk->timestamp);
return buf;
}
return datestr_from_pk (pk);
}
const char *
colon_datestr_from_sk (PKT_secret_key *sk)
{
if (opt.fixed_list_mode) {
static char buf[15];
sprintf (buf, "%lu", (ulong)sk->timestamp);
return buf;
}
return datestr_from_sk (sk);
}
const char *
colon_datestr_from_sig (PKT_signature *sig)
{
if (opt.fixed_list_mode) {
static char buf[15];
sprintf (buf, "%lu", (ulong)sig->timestamp);
return buf;
}
return datestr_from_sig (sig);
}
const char *
colon_expirestr_from_sig (PKT_signature *sig)
{
if(!sig->expiredate)
return "";
if (opt.fixed_list_mode) {
static char buf[15];
sprintf (buf, "%lu", (ulong)sig->expiredate);
return buf;
}
return expirestr_from_sig (sig);
}
/**************** .
* Return a byte array with the fingerprint for the given PK/SK
* The length of the array is returned in ret_len. Caller must free
* the array or provide an array of length MAX_FINGERPRINT_LEN.
*/
byte *
fingerprint_from_pk( PKT_public_key *pk, byte *array, size_t *ret_len )
{
byte *p, *buf;
const byte *dp;
size_t len;
unsigned int n;
if( pk->version < 4 )
{
if( is_RSA(pk->pubkey_algo) )
{
/* RSA in version 3 packets is special */
MD_HANDLE md;
md = md_open( DIGEST_ALGO_MD5, 0);
if( pubkey_get_npkey( pk->pubkey_algo ) > 1 ) {
p = buf = mpi_get_buffer( pk->pkey[0], &n, NULL );
md_write( md, p, n );
xfree(buf);
p = buf = mpi_get_buffer( pk->pkey[1], &n, NULL );
md_write( md, p, n );
xfree(buf);
}
md_final(md);
if( !array )
array = xmalloc( 16 );
len = 16;
memcpy(array, md_read(md, DIGEST_ALGO_MD5), 16 );
md_close(md);
}
else
{
if(!array)
array=xmalloc(16);
len=16;
memset(array,0,16);
}
}
else {
MD_HANDLE md;
md = do_fingerprint_md(pk);
dp = md_read( md, 0 );
len = md_digest_length( md_get_algo( md ) );
assert( len <= MAX_FINGERPRINT_LEN );
if( !array )
array = xmalloc( len );
memcpy(array, dp, len );
pk->keyid[0] = dp[12] << 24 | dp[13] << 16 | dp[14] << 8 | dp[15] ;
pk->keyid[1] = dp[16] << 24 | dp[17] << 16 | dp[18] << 8 | dp[19] ;
md_close(md);
}
*ret_len = len;
return array;
}
byte *
fingerprint_from_sk( PKT_secret_key *sk, byte *array, size_t *ret_len )
{
byte *p, *buf;
const char *dp;
size_t len;
unsigned n;
if( sk->version < 4 )
{
if( is_RSA(sk->pubkey_algo) )
{
/* RSA in version 3 packets is special */
MD_HANDLE md;
md = md_open( DIGEST_ALGO_MD5, 0);
if( pubkey_get_npkey( sk->pubkey_algo ) > 1 ) {
p = buf = mpi_get_buffer( sk->skey[0], &n, NULL );
md_write( md, p, n );
xfree(buf);
p = buf = mpi_get_buffer( sk->skey[1], &n, NULL );
md_write( md, p, n );
xfree(buf);
}
md_final(md);
if( !array )
array = xmalloc( 16 );
len = 16;
memcpy(array, md_read(md, DIGEST_ALGO_MD5), 16 );
md_close(md);
}
else
{
if(!array)
array=xmalloc(16);
len=16;
memset(array,0,16);
}
}
else {
MD_HANDLE md;
md = do_fingerprint_md_sk(sk);
if(md)
{
dp = md_read( md, 0 );
len = md_digest_length( md_get_algo( md ) );
assert( len <= MAX_FINGERPRINT_LEN );
if( !array )
array = xmalloc( len );
memcpy(array, dp, len );
md_close(md);
}
else
{
len=MAX_FINGERPRINT_LEN;
if(!array)
array=xmalloc(len);
memset(array,0,len);
}
}
*ret_len = len;
return array;
}
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