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gnupg/g10/ringedit.c

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/* ringedit.c - Function for key ring editing
* 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
*/
/****************
* This module supplies function for:
*
* - Search for a key block (pubkey and all other stuff) and return a
* handle for it.
*
* - Lock/Unlock a key block
*
* - Read a key block into a tree
*
* - Update a key block
*
* - Insert a new key block
*
* - Delete a key block
*
* FIXME: Keep track of all nodes, so that a change is propagated
* to all nodes. (or use shallow copies and ref-counting?)
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h> /* for truncate */
#include <assert.h>
#ifdef HAVE_LIBGDBM
#include <gdbm.h>
#endif
#include "util.h"
#include "packet.h"
#include "memory.h"
#include "mpi.h"
#include "iobuf.h"
#include "keydb.h"
#include "options.h"
#include "i18n.h"
struct resource_table_struct {
int used;
int secret; /* this is a secret keyring */
char *fname;
IOBUF iobuf;
#ifdef HAVE_LIBGDBM
GDBM_FILE dbf;
#endif
enum resource_type rt;
};
typedef struct resource_table_struct RESTBL;
#define MAX_RESOURCES 10
static RESTBL resource_table[MAX_RESOURCES];
static int search( PACKET *pkt, KBPOS *kbpos, int secret );
static int keyring_search( PACKET *pkt, KBPOS *kbpos, IOBUF iobuf,
const char *fname );
static int keyring_read( KBPOS *kbpos, KBNODE *ret_root );
static int keyring_enum( KBPOS *kbpos, KBNODE *ret_root, int skipsigs );
static int keyring_copy( KBPOS *kbpos, int mode, KBNODE root );
static RESTBL *
check_pos( KBPOS *kbpos )
{
if( kbpos->resno < 0 || kbpos->resno >= MAX_RESOURCES )
return NULL;
if( !resource_table[kbpos->resno].used )
return NULL;
return resource_table + kbpos->resno;
}
/****************************************************************
****************** public functions ****************************
****************************************************************/
/****************
* Get the name of the keyrings, start with a sequence number pointing to a 0.
*/
const char *
enum_keyblock_resources( int *sequence, int secret )
{
int i = *sequence;
const char *name = NULL;
for(; i < MAX_RESOURCES; i++ )
if( resource_table[i].used && !resource_table[i].secret == !secret ) {
if( resource_table[i].fname ) {
name = resource_table[i].fname;
break;
}
}
*sequence = ++i;
return name;
}
/****************
* Register a resource (which currently may only be a keyring file).
* The first keyring which is added by this function is
* created if it does not exist.
* Note: this function may be called before secure memory is
* available.
*/
int
add_keyblock_resource( const char *url, int force, int secret )
{
static int any_secret, any_public;
const char *resname = url;
IOBUF iobuf;
int i;
char *filename = NULL;
int rc = 0;
enum resource_type rt = rt_UNKNOWN;
/* Do we have an URL?
* gnupg-gdbm:filename := this is a GDBM resource
* gnupg-ring:filename := this is a plain keyring
* filename := See what is is, but create as plain keyring.
*/
if( strlen( resname ) > 11 ) {
if( !strncmp( resname, "gnupg-ring:", 11 ) ) {
rt = rt_RING;
resname += 11;
}
else if( !strncmp( resname, "gnupg-gdbm:", 11 ) ) {
rt = rt_GDBM;
resname += 11;
}
#ifndef __MINGW32__
else if( strchr( resname, ':' ) ) {
log_error("%s: invalid URL\n", url );
rc = G10ERR_GENERAL;
goto leave;
}
#endif
}
if( *resname != '/' ) { /* do tilde expansion etc */
if( strchr(resname, '/') )
filename = make_filename(resname, NULL);
else
filename = make_filename(opt.homedir, resname, NULL);
}
else
filename = m_strdup( resname );
if( !force )
force = secret? !any_secret : !any_public;
for(i=0; i < MAX_RESOURCES; i++ )
if( !resource_table[i].used )
break;
if( i == MAX_RESOURCES ) {
rc = G10ERR_RESOURCE_LIMIT;
goto leave;
}
switch( rt ) {
case rt_UNKNOWN:
case rt_RING:
iobuf = iobuf_fopen( filename, "rb" );
if( !iobuf && !force ) {
rc = G10ERR_OPEN_FILE;
goto leave;
}
if( !iobuf ) {
iobuf = iobuf_create( filename );
if( !iobuf ) {
log_error("%s: can't create: %s\n", filename, strerror(errno));
rc = G10ERR_OPEN_FILE;
goto leave;
}
else
log_info("%s: keyring created\n", filename );
}
/* fixme: see whether it is really a ring or if type is unknown,
* try to figure out of what type it is
*/
rt = rt_RING; /* <--- FIXME */
#ifdef __MINGW32__
/* must close it again */
iobuf_close( iobuf );
iobuf = NULL;
#endif
break;
#ifdef HAVE_LIBGDBM
case rt_GDBM:
break;
#endif
default:
log_error("%s: unsupported resource type\n", url );
rc = G10ERR_GENERAL;
goto leave;
}
resource_table[i].used = 1;
resource_table[i].secret = !!secret;
resource_table[i].fname = m_strdup(filename);
resource_table[i].iobuf = iobuf;
resource_table[i].rt = rt;
leave:
if( rc )
log_error("keyblock resource '%s': %s\n", filename, g10_errstr(rc) );
else if( secret )
any_secret = 1;
else
any_public = 1;
m_free( filename );
return rc;
}
/****************
* Return the resource name of the keyblock associated with KBPOS.
*/
const char *
keyblock_resource_name( KBPOS *kbpos )
{
RESTBL *rentry;
if( !(rentry = check_pos( kbpos )) || !rentry->fname )
log_bug("no name for keyblock resource %d\n", kbpos->resno );
return rentry->fname;
}
/****************
* Get a keyblock handle KBPOS from a filename. This can be used
* to get a handle for insert_keyblock for a new keyblock.
* Using a filename of NULL returns the default resource
*/
int
get_keyblock_handle( const char *filename, int secret, KBPOS *kbpos )
{
int i;
for(i=0; i < MAX_RESOURCES; i++ )
if( resource_table[i].used && !resource_table[i].secret == !secret ) {
/* fixme: dos needs case insensitive file compare */
if( !filename || !strcmp( resource_table[i].fname, filename ) ) {
memset( kbpos, 0, sizeof *kbpos );
kbpos->resno = i;
return 0;
}
}
return -1; /* not found */
}
/****************
* Search a keyblock which starts with the given packet and puts all
* information into KBPOS, which can be used later to access this key block.
* This function looks into all registered keyblock sources.
* PACKET must be a packet with either a secret_key or a public_key
*
* This function is intended to check whether a given certificate
* is already in a keyring or to prepare it for editing.
*
* Returns: 0 if found, -1 if not found or an errorcode.
*/
static int
search( PACKET *pkt, KBPOS *kbpos, int secret )
{
int i, rc, last_rc=-1;
for(i=0; i < MAX_RESOURCES; i++ ) {
if( resource_table[i].used && !resource_table[i].secret == !secret ) {
switch( resource_table[i].rt ) {
case rt_RING:
rc = keyring_search( pkt, kbpos, resource_table[i].iobuf,
resource_table[i].fname );
break;
#ifdef HAVE_LIBGDBM
case rt_GDBM
rc = do_gdbm_search( pkt, kbpos, resource_table[i].dbf,
resource_table[i].fname );
break;
#endif
default: BUG();
}
if( !rc ) {
kbpos->resno = i;
kbpos->fp = NULL;
return 0;
}
if( rc != -1 ) {
log_error("error searching resource %d: %s\n",
i, g10_errstr(rc));
last_rc = rc;
}
}
}
return last_rc;
}
/****************
* Combined function to search for a username and get the position
* of the keyblock.
*/
int
find_keyblock_byname( KBPOS *kbpos, const char *username )
{
PACKET pkt;
PKT_public_key *pk = m_alloc_clear( sizeof *pk );
int rc;
rc = get_pubkey_byname( pk, username );
if( rc ) {
free_public_key(pk);
return rc;
}
init_packet( &pkt );
pkt.pkttype = PKT_PUBLIC_KEY;
pkt.pkt.public_key = pk;
rc = search( &pkt, kbpos, 0 );
free_public_key(pk);
return rc;
}
/****************
* Combined function to search for a key and get the position
* of the keyblock.
*/
int
find_keyblock_bypk( KBPOS *kbpos, PKT_public_key *pk )
{
PACKET pkt;
int rc;
init_packet( &pkt );
pkt.pkttype = PKT_PUBLIC_KEY;
pkt.pkt.public_key = pk;
rc = search( &pkt, kbpos, 0 );
return rc;
}
/****************
* Combined function to search for a username and get the position
* of the keyblock. This function does not unprotect the secret key.
*/
int
find_secret_keyblock_byname( KBPOS *kbpos, const char *username )
{
PACKET pkt;
PKT_secret_key *sk = m_alloc_clear( sizeof *sk );
int rc;
rc = get_seckey_byname( sk, username, 0 );
if( rc ) {
free_secret_key(sk);
return rc;
}
init_packet( &pkt );
pkt.pkttype = PKT_SECRET_KEY;
pkt.pkt.secret_key = sk;
rc = search( &pkt, kbpos, 1 );
free_secret_key(sk);
return rc;
}
/****************
* Lock the keyblock; wait until it's available
* This function may change the internal data in kbpos, in cases
* when the keyblock to be locked has been modified.
* fixme: remove this function and add an option to search()?
*/
int
lock_keyblock( KBPOS *kbpos )
{
if( !check_pos(kbpos) )
return G10ERR_GENERAL;
return 0;
}
/****************
* Release a lock on a keyblock
*/
void
unlock_keyblock( KBPOS *kbpos )
{
if( !check_pos(kbpos) )
BUG();
}
/****************
* Read a complete keyblock and return the root in ret_root.
*/
int
read_keyblock( KBPOS *kbpos, KBNODE *ret_root )
{
if( !check_pos(kbpos) )
return G10ERR_GENERAL;
switch( kbpos->rt ) {
case rt_RING:
return keyring_read( kbpos, ret_root );
#ifdef HAVE_LIBGDBM
case rt_GDBM:
return do_gdbm_read( kbpos, ret_root );
#endif
default: BUG();
}
}
/****************
* This functions can be used to read through a complete keyring.
* Mode is: 0 = open
* 1 = read
* 2 = close
* 5 = open secret keyrings
* 11 = read but skip signature and comment packets.
* all others are reserved!
* Note that you do not need a search prior to this function,
* only a handle is needed.
* NOTE: It is not allowed to do an insert/update/delete with this
* keyblock, if you want to do this, use search/read!
*/
int
enum_keyblocks( int mode, KBPOS *kbpos, KBNODE *ret_root )
{
int rc = 0;
RESTBL *rentry;
if( !mode || mode == 5 || mode == 100 ) {
int i;
kbpos->fp = NULL;
if( !mode ) {
kbpos->secret = 0;
i = 0;
}
else if( mode == 5 ) {
kbpos->secret = 1;
mode = 0;
i = 0;
}
else
i = kbpos->resno+1;
for(; i < MAX_RESOURCES; i++ )
if( resource_table[i].used
&& !resource_table[i].secret == !kbpos->secret )
break;
if( i == MAX_RESOURCES )
return -1; /* no resources */
kbpos->resno = i;
rentry = check_pos( kbpos );
kbpos->rt = resource_table[i].rt;
switch( kbpos->rt ) {
case rt_RING:
kbpos->fp = iobuf_fopen( rentry->fname, "rb" );
if( !kbpos->fp ) {
log_error("can't open '%s'\n", rentry->fname );
return G10ERR_OPEN_FILE;
}
break;
#ifdef HAVE_LIBGDBM
case rt_GDBM:
/* FIXME!!!! */
break;
#endif
default: BUG();
}
kbpos->pkt = NULL;
}
else if( mode == 1 || mode == 11 ) {
int cont;
do {
cont = 0;
switch( kbpos->rt ) {
case rt_RING:
if( !kbpos->fp )
return G10ERR_GENERAL;
rc = keyring_enum( kbpos, ret_root, mode == 11 );
break;
#ifdef HAVE_LIBGDBM
case rt_GDBM:
/* FIXME!!!! */
break;
#endif
default: BUG();
}
if( rc == -1 ) {
assert( !kbpos->pkt );
rentry = check_pos( kbpos );
assert(rentry);
/* close */
enum_keyblocks(2, kbpos, ret_root );
/* and open the next one */
rc = enum_keyblocks(100, kbpos, ret_root );
if( !rc )
cont = 1;
}
} while(cont);
}
else {
switch( kbpos->rt ) {
case rt_RING:
if( kbpos->fp ) {
iobuf_close( kbpos->fp );
kbpos->fp = NULL;
}
break;
#ifdef HAVE_LIBGDBM
case rt_GDBM:
/* FIXME!!!! */
break;
#endif
default: BUG();
}
/* release pending packet */
free_packet( kbpos->pkt );
m_free( kbpos->pkt );
}
return rc;
}
/****************
* Insert the keyblock described by ROOT into the keyring described
* by KBPOS. This actually appends the data to the keyfile.
*/
int
insert_keyblock( KBPOS *kbpos, KBNODE root )
{
int rc;
if( !check_pos(kbpos) )
return G10ERR_GENERAL;
switch( kbpos->rt ) {
case rt_RING:
rc = keyring_copy( kbpos, 1, root );
break;
#ifdef HAVE_LIBGDBM
case rt_GDBM:
/* FIXME!!!! */
break;
#endif
default: BUG();
}
return rc;
}
/****************
* Delete the keyblock described by KBPOS.
* The current code simply changes the keyblock in the keyring
* to packet of type 0 with the correct length. To help detect errors,
* zero bytes are written.
*/
int
delete_keyblock( KBPOS *kbpos )
{
int rc;
if( !check_pos(kbpos) )
return G10ERR_GENERAL;
switch( kbpos->rt ) {
case rt_RING:
rc = keyring_copy( kbpos, 2, NULL );
break;
#ifdef HAVE_LIBGDBM
case rt_GDBM:
/* FIXME!!!! */
break;
#endif
default: BUG();
}
return rc;
}
/****************
* Update the keyblock at KBPOS with the one in ROOT.
*/
int
update_keyblock( KBPOS *kbpos, KBNODE root )
{
int rc;
if( !check_pos(kbpos) )
return G10ERR_GENERAL;
switch( kbpos->rt ) {
case rt_RING:
rc = keyring_copy( kbpos, 3, root );
break;
#ifdef HAVE_LIBGDBM
case rt_GDBM:
/* FIXME!!!! */
break;
#endif
default: BUG();
}
return rc;
}
/****************************************************************
********** Functions which operates on regular keyrings ********
****************************************************************/
static int
cmp_seckey( PKT_secret_key *req_sk, PKT_secret_key *sk )
{
int n,i;
assert( req_sk->pubkey_algo == sk->pubkey_algo );
n = pubkey_get_nskey( req_sk->pubkey_algo );
for(i=0; i < n; i++ ) {
if( mpi_cmp( req_sk->skey[i], sk->skey[i] ) )
return -1;
}
return 0;
}
static int
cmp_pubkey( PKT_public_key *req_pk, PKT_public_key *pk )
{
int n, i;
assert( req_pk->pubkey_algo == pk->pubkey_algo );
n = pubkey_get_npkey( req_pk->pubkey_algo );
for(i=0; i < n; i++ ) {
if( mpi_cmp( req_pk->pkey[i], pk->pkey[i] ) )
return -1;
}
return 0;
}
/****************
* search one keyring, return 0 if found, -1 if not found or an errorcode.
*/
static int
keyring_search( PACKET *req, KBPOS *kbpos, IOBUF iobuf, const char *fname )
{
int rc;
PACKET pkt;
int save_mode;
ulong offset;
int pkttype = req->pkttype;
PKT_public_key *req_pk = req->pkt.public_key;
PKT_secret_key *req_sk = req->pkt.secret_key;
init_packet(&pkt);
save_mode = set_packet_list_mode(0);
kbpos->rt = rt_RING;
#if __MINGW32__
assert(!iobuf);
iobuf = iobuf_open( fname );
if( !iobuf ) {
log_error("%s: can't open keyring file\n", fname);
rc = G10ERR_KEYRING_OPEN;
goto leave;
}
#else
if( iobuf_seek( iobuf, 0 ) ) {
log_error("can't rewind keyring file\n");
rc = G10ERR_KEYRING_OPEN;
goto leave;
}
#endif
while( !(rc=search_packet(iobuf, &pkt, pkttype, &offset)) ) {
if( pkt.pkttype == PKT_SECRET_KEY ) {
PKT_secret_key *sk = pkt.pkt.secret_key;
if( req_sk->timestamp == sk->timestamp
&& req_sk->pubkey_algo == sk->pubkey_algo
&& !cmp_seckey( req_sk, sk) )
break; /* found */
}
else if( pkt.pkttype == PKT_PUBLIC_KEY ) {
PKT_public_key *pk = pkt.pkt.public_key;
if( req_pk->timestamp == pk->timestamp
&& req_pk->pubkey_algo == pk->pubkey_algo
&& !cmp_pubkey( req_pk, pk ) )
break; /* found */
}
else
BUG();
free_packet(&pkt);
}
if( !rc )
kbpos->offset = offset;
leave:
free_packet(&pkt);
set_packet_list_mode(save_mode);
#if __MINGW32__
iobuf_close(iobuf);
#endif
return rc;
}
static int
keyring_read( KBPOS *kbpos, KBNODE *ret_root )
{
PACKET *pkt;
int rc;
RESTBL *rentry;
KBNODE root = NULL;
IOBUF a;
int in_cert = 0;
if( !(rentry=check_pos(kbpos)) )
return G10ERR_GENERAL;
a = iobuf_fopen( rentry->fname, "rb" );
if( !a ) {
log_error("can't open '%s'\n", rentry->fname );
return G10ERR_OPEN_FILE;
}
if( iobuf_seek( a, kbpos->offset ) ) {
log_error("can't seek to %lu\n", kbpos->offset);
iobuf_close(a);
return G10ERR_KEYRING_OPEN;
}
pkt = m_alloc( sizeof *pkt );
init_packet(pkt);
kbpos->count=0;
while( (rc=parse_packet(a, pkt)) != -1 ) {
if( rc ) { /* ignore errors */
if( rc != G10ERR_UNKNOWN_PACKET ) {
log_error("read_keyblock: read error: %s\n", g10_errstr(rc) );
rc = G10ERR_INV_KEYRING;
goto ready;
}
kbpos->count++;
free_packet( pkt );
init_packet( pkt );
continue;
}
/* make a linked list of all packets */
switch( pkt->pkttype ) {
case PKT_PUBLIC_KEY:
case PKT_SECRET_KEY:
if( in_cert )
goto ready;
in_cert = 1;
default:
kbpos->count++;
if( !root )
root = new_kbnode( pkt );
else
add_kbnode( root, new_kbnode( pkt ) );
pkt = m_alloc( sizeof *pkt );
init_packet(pkt);
break;
}
}
ready:
if( rc == -1 && root )
rc = 0;
if( rc )
release_kbnode( root );
else
*ret_root = root;
free_packet( pkt );
m_free( pkt );
iobuf_close(a);
return rc;
}
static int
keyring_enum( KBPOS *kbpos, KBNODE *ret_root, int skipsigs )
{
PACKET *pkt;
int rc;
RESTBL *rentry;
KBNODE root = NULL;
if( !(rentry=check_pos(kbpos)) )
return G10ERR_GENERAL;
if( kbpos->pkt ) {
root = new_kbnode( kbpos->pkt );
kbpos->pkt = NULL;
}
pkt = m_alloc( sizeof *pkt );
init_packet(pkt);
while( (rc=parse_packet(kbpos->fp, pkt)) != -1 ) {
if( rc ) { /* ignore errors */
if( rc != G10ERR_UNKNOWN_PACKET ) {
log_error("read_keyblock: read error: %s\n", g10_errstr(rc) );
rc = G10ERR_INV_KEYRING;
goto ready;
}
free_packet( pkt );
init_packet( pkt );
continue;
}
/* make a linked list of all packets */
switch( pkt->pkttype ) {
case PKT_PUBLIC_KEY:
case PKT_SECRET_KEY:
if( root ) { /* store this packet */
kbpos->pkt = pkt;
pkt = NULL;
goto ready;
}
root = new_kbnode( pkt );
pkt = m_alloc( sizeof *pkt );
init_packet(pkt);
break;
default:
/* skip pakets at the beginning of a keyring, until we find
* a start packet; issue a warning if it is not a comment */
if( !root && pkt->pkttype != PKT_COMMENT
&& pkt->pkttype != PKT_OLD_COMMENT ) {
log_info("keyring_enum: skipped packet of type %d\n",
pkt->pkttype );
break;
}
if( !root || (skipsigs && ( pkt->pkttype == PKT_SIGNATURE
||pkt->pkttype == PKT_COMMENT
||pkt->pkttype == PKT_OLD_COMMENT )) ) {
init_packet(pkt);
break;
}
add_kbnode( root, new_kbnode( pkt ) );
pkt = m_alloc( sizeof *pkt );
init_packet(pkt);
break;
}
}
ready:
if( rc == -1 && root )
rc = 0;
if( rc )
release_kbnode( root );
else
*ret_root = root;
free_packet( pkt );
m_free( pkt );
return rc;
}
/****************
* Perform insert/delete/update operation.
* mode 1 = insert
* 2 = delete
* 3 = update
*/
static int
keyring_copy( KBPOS *kbpos, int mode, KBNODE root )
{
RESTBL *rentry;
IOBUF fp, newfp;
int rc=0;
char *bakfname = NULL;
char *tmpfname = NULL;
if( !(rentry = check_pos( kbpos )) )
return G10ERR_GENERAL;
if( kbpos->fp )
BUG(); /* not allowed with such a handle */
/* open the source file */
fp = iobuf_fopen( rentry->fname, "rb" );
if( mode == 1 && !fp && errno == ENOENT ) { /* no file yet */
KBNODE kbctx, node;
/* insert: create a new file */
newfp = iobuf_create( rentry->fname );
if( !newfp ) {
log_error("%s: can't create: %s\n", rentry->fname, strerror(errno));
return G10ERR_OPEN_FILE;
}
else
log_info("%s: keyring created\n", rentry->fname );
kbctx=NULL;
while( (node = walk_kbnode( root, &kbctx, 0 )) ) {
if( (rc = build_packet( newfp, node->pkt )) ) {
log_error("build_packet(%d) failed: %s\n",
node->pkt->pkttype, g10_errstr(rc) );
iobuf_cancel(newfp);
return G10ERR_WRITE_FILE;
}
}
if( iobuf_close(newfp) ) {
log_error("%s: close failed: %s\n", rentry->fname, strerror(errno));
return G10ERR_CLOSE_FILE;
}
if( chmod( rentry->fname, S_IRUSR | S_IWUSR ) ) {
log_error("%s: chmod failed: %s\n",
rentry->fname, strerror(errno) );
return G10ERR_WRITE_FILE;
}
return 0;
}
if( !fp ) {
log_error("%s: can't open: %s\n", rentry->fname, strerror(errno) );
rc = G10ERR_OPEN_FILE;
goto leave;
}
/* create the new file */
#ifdef __MINGW32__
/* Here is another Windoze bug?:
* you cant rename("pubring.gpg.tmp", "pubring.gpg");
* but rename("pubring.gpg.tmp", "pubring.aaa");
* works. So we replace .gpg by .bak or .tmp
*/
if( strlen(rentry->fname) > 4
&& !strcmp(rentry->fname+strlen(rentry->fname)-4, ".gpg") ) {
bakfname = m_alloc( strlen( rentry->fname ) + 1 );
strcpy(bakfname,rentry->fname);
strcpy(bakfname+strlen(rentry->fname)-4, ".bak");
tmpfname = m_alloc( strlen( rentry->fname ) + 1 );
strcpy(tmpfname,rentry->fname);
strcpy(tmpfname+strlen(rentry->fname)-4, ".tmp");
}
else { /* file does not end with gpg; hmmm */
bakfname = m_alloc( strlen( rentry->fname ) + 5 );
strcpy(stpcpy(bakfname,rentry->fname),".bak");
tmpfname = m_alloc( strlen( rentry->fname ) + 5 );
strcpy(stpcpy(tmpfname,rentry->fname),".tmp");
}
#else
bakfname = m_alloc( strlen( rentry->fname ) + 2 );
strcpy(stpcpy(bakfname,rentry->fname),"~");
tmpfname = m_alloc( strlen( rentry->fname ) + 5 );
strcpy(stpcpy(tmpfname,rentry->fname),".tmp");
#endif
newfp = iobuf_create( tmpfname );
if( !newfp ) {
log_error("%s: can't create: %s\n", tmpfname, strerror(errno) );
iobuf_close(fp);
rc = G10ERR_OPEN_FILE;
goto leave;
}
if( mode == 1 ) { /* insert */
/* copy everything to the new file */
rc = copy_all_packets( fp, newfp );
if( rc != -1 ) {
log_error("%s: copy to %s failed: %s\n",
rentry->fname, tmpfname, g10_errstr(rc) );
iobuf_close(fp);
iobuf_cancel(newfp);
goto leave;
}
rc = 0;
}
if( mode == 2 || mode == 3 ) { /* delete or update */
/* copy first part to the new file */
rc = copy_some_packets( fp, newfp, kbpos->offset );
if( rc ) { /* should never get EOF here */
log_error("%s: copy to %s failed: %s\n",
rentry->fname, tmpfname, g10_errstr(rc) );
iobuf_close(fp);
iobuf_cancel(newfp);
goto leave;
}
/* skip this keyblock */
assert( kbpos->count );
rc = skip_some_packets( fp, kbpos->count );
if( rc ) {
log_error("%s: skipping %u packets failed: %s\n",
rentry->fname, kbpos->count, g10_errstr(rc));
iobuf_close(fp);
iobuf_cancel(newfp);
goto leave;
}
}
if( mode == 1 || mode == 3 ) { /* insert or update */
KBNODE kbctx, node;
/* append the new data */
kbctx=NULL;
while( (node = walk_kbnode( root, &kbctx, 0 )) ) {
if( (rc = build_packet( newfp, node->pkt )) ) {
log_error("build_packet(%d) failed: %s\n",
node->pkt->pkttype, g10_errstr(rc) );
iobuf_close(fp);
iobuf_cancel(newfp);
rc = G10ERR_WRITE_FILE;
goto leave;
}
}
}
if( mode == 2 || mode == 3 ) { /* delete or update */
/* copy the rest */
rc = copy_all_packets( fp, newfp );
if( rc != -1 ) {
log_error("%s: copy to %s failed: %s\n",
rentry->fname, tmpfname, g10_errstr(rc) );
iobuf_close(fp);
iobuf_cancel(newfp);
goto leave;
}
rc = 0;
}
/* close both files */
if( iobuf_close(fp) ) {
log_error("%s: close failed: %s\n", rentry->fname, strerror(errno) );
rc = G10ERR_CLOSE_FILE;
goto leave;
}
if( iobuf_close(newfp) ) {
log_error("%s: close failed: %s\n", tmpfname, strerror(errno) );
rc = G10ERR_CLOSE_FILE;
goto leave;
}
/* if the new file is a secring, restrict the permissions */
#ifndef __MINGW32__
if( rentry->secret ) {
if( chmod( tmpfname, S_IRUSR | S_IWUSR ) ) {
log_error("%s: chmod failed: %s\n",
tmpfname, strerror(errno) );
rc = G10ERR_WRITE_FILE;
goto leave;
}
}
#endif
/* rename and make backup file */
if( !rentry->secret ) { /* but not for secret keyrings */
#ifdef __MINGW32__
remove( bakfname );
#endif
if( rename( rentry->fname, bakfname ) ) {
log_error("%s: rename to %s failed: %s\n",
rentry->fname, bakfname, strerror(errno) );
rc = G10ERR_RENAME_FILE;
goto leave;
}
}
#ifdef __MINGW32__
remove( rentry->fname );
#endif
if( rename( tmpfname, rentry->fname ) ) {
log_error("%s: rename to %s failed: %s\n",
tmpfname, rentry->fname,strerror(errno) );
rc = G10ERR_RENAME_FILE;
if( rentry->secret ) {
log_info(_(
"Warning: 2 files with confidential information exists.\n"));
log_info(_("%s is the unchanged one\n"), rentry->fname );
log_info(_("%s is the new one\n"), tmpfname );
log_info(_("Please fix this possible security flaw\n"));
}
goto leave;
}
leave:
m_free(bakfname);
m_free(tmpfname);
return rc;
}
#ifdef HAVE_LIBGDBM
/****************************************************************
********** Functions which operates on GDM files ***************
****************************************************************/
/****************
* search one keybox, return 0 if found, -1 if not found or an errorcode.
*/
static int
do_gdbm_search( PACKET *req, KBPOS *kbpos, GDBM_FILE dbf, const char *fname )
{
int rc;
PACKET pkt;
int save_mode;
ulong offset;
int pkttype = req->pkttype;
PKT_public_key *req_pk = req->pkt.public_key;
PKT_secret_key *req_sk = req->pkt.secret_key;
init_packet(&pkt);
save_mode = set_packet_list_mode(0);
while( !(rc=search_packet(iobuf, &pkt, pkttype, &offset)) ) {
if( pkt.pkttype == PKT_SECRET_KEY ) {
PKT_secret_key *sk = pkt.pkt.secret_key;
if( req_sk->timestamp == sk->timestamp
&& req_sk->pubkey_algo == sk->pubkey_algo
&& !cmp_seckey( req_sk, sk) )
break; /* found */
}
else if( pkt.pkttype == PKT_PUBLIC_KEY ) {
PKT_public_key *pk = pkt.pkt.public_key;
if( req_pk->timestamp == pk->timestamp
&& req_pk->pubkey_algo == pk->pubkey_algo
&& !cmp_pubkey( req_pk, pk ) )
break; /* found */
}
else
BUG();
free_packet(&pkt);
}
if( !rc )
kbpos->offset = offset;
leave:
free_packet(&pkt);
set_packet_list_mode(save_mode);
#if __MINGW32__
iobuf_close(iobuf);
#endif
return rc;
}
static int
do_gdbm_read( KBPOS *kbpos, KBNODE *ret_root )
{
PACKET *pkt;
int rc;
RESTBL *rentry;
KBNODE root = NULL;
IOBUF a;
int in_cert = 0;
if( !(rentry=check_pos(kbpos)) )
return G10ERR_GENERAL;
a = iobuf_fopen( rentry->fname, "rb" );
if( !a ) {
log_error("can't open '%s'\n", rentry->fname );
return G10ERR_OPEN_FILE;
}
if( iobuf_seek( a, kbpos->offset ) ) {
log_error("can't seek to %lu\n", kbpos->offset);
iobuf_close(a);
return G10ERR_KEYRING_OPEN;
}
pkt = m_alloc( sizeof *pkt );
init_packet(pkt);
kbpos->count=0;
while( (rc=parse_packet(a, pkt)) != -1 ) {
if( rc ) { /* ignore errors */
if( rc != G10ERR_UNKNOWN_PACKET ) {
log_error("read_keyblock: read error: %s\n", g10_errstr(rc) );
rc = G10ERR_INV_KEYRING;
goto ready;
}
kbpos->count++;
free_packet( pkt );
init_packet( pkt );
continue;
}
/* make a linked list of all packets */
switch( pkt->pkttype ) {
case PKT_PUBLIC_KEY:
case PKT_SECRET_KEY:
if( in_cert )
goto ready;
in_cert = 1;
default:
kbpos->count++;
if( !root )
root = new_kbnode( pkt );
else
add_kbnode( root, new_kbnode( pkt ) );
pkt = m_alloc( sizeof *pkt );
init_packet(pkt);
break;
}
}
ready:
if( rc == -1 && root )
rc = 0;
if( rc )
release_kbnode( root );
else
*ret_root = root;
free_packet( pkt );
m_free( pkt );
iobuf_close(a);
return rc;
}
static int
do_gdbm_enum( KBPOS *kbpos, KBNODE *ret_root, int skipsigs )
{
PACKET *pkt;
int rc;
RESTBL *rentry;
KBNODE root = NULL;
if( !(rentry=check_pos(kbpos)) )
return G10ERR_GENERAL;
if( kbpos->pkt ) {
root = new_kbnode( kbpos->pkt );
kbpos->pkt = NULL;
}
pkt = m_alloc( sizeof *pkt );
init_packet(pkt);
while( (rc=parse_packet(kbpos->fp, pkt)) != -1 ) {
if( rc ) { /* ignore errors */
if( rc != G10ERR_UNKNOWN_PACKET ) {
log_error("read_keyblock: read error: %s\n", g10_errstr(rc) );
rc = G10ERR_INV_KEYRING;
goto ready;
}
free_packet( pkt );
init_packet( pkt );
continue;
}
/* make a linked list of all packets */
switch( pkt->pkttype ) {
case PKT_PUBLIC_KEY:
case PKT_SECRET_KEY:
if( root ) { /* store this packet */
kbpos->pkt = pkt;
pkt = NULL;
goto ready;
}
root = new_kbnode( pkt );
pkt = m_alloc( sizeof *pkt );
init_packet(pkt);
break;
default:
/* skip pakets at the beginning of a keyring, until we find
* a start packet; issue a warning if it is not a comment */
if( !root && pkt->pkttype != PKT_COMMENT
&& pkt->pkttype != PKT_OLD_COMMENT ) {
log_info("keyring_enum: skipped packet of type %d\n",
pkt->pkttype );
break;
}
if( !root || (skipsigs && ( pkt->pkttype == PKT_SIGNATURE
||pkt->pkttype == PKT_COMMENT
||pkt->pkttype == PKT_OLD_COMMENT )) ) {
init_packet(pkt);
break;
}
add_kbnode( root, new_kbnode( pkt ) );
pkt = m_alloc( sizeof *pkt );
init_packet(pkt);
break;
}
}
ready:
if( rc == -1 && root )
rc = 0;
if( rc )
release_kbnode( root );
else
*ret_root = root;
free_packet( pkt );
m_free( pkt );
return rc;
}
#endif /*HAVE_LIBGDBM*/
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