/* ringedit.c - Function for key ring editing
* Copyright (C) 1998, 2000 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
*
*/
#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>
#include <gcrypt.h>
#include "util.h"
#include "packet.h"
#include "iobuf.h"
#include "keydb.h"
#include "host2net.h"
#include "options.h"
#include "main.h"
#include "i18n.h"
#include "kbx.h"
struct resource_table_struct {
int used;
int secret; /* this is a secret keyring */
char *fname;
IOBUF iobuf;
enum resource_type rt;
DOTLOCK lockhd;
int is_locked;
};
typedef struct resource_table_struct RESTBL;
struct keyblock_pos_struct {
int resno; /* resource number */
enum resource_type rt;
ulong offset; /* position information */
unsigned count; /* length of the keyblock in packets */
IOBUF fp; /* used by enum_keyblocks */
int secret; /* working on a secret keyring */
PACKET *pkt; /* ditto */
int valid;
ulong save_offset;
};
#define MAX_RESOURCES 10
static RESTBL resource_table[MAX_RESOURCES];
static int default_public_resource;
static int default_secret_resource;
static int keyring_enum( KBPOS kbpos, KBNODE *ret_root, int skipsigs );
static int keyring_copy( KBPOS kbpos, int mode, KBNODE root );
static int do_kbxf_enum( KBPOS kbpos, KBNODE *ret_root, int skipsigs );
static int do_kbxf_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;
}
/****************
* Hmmm, how to avoid deadlock? They should not happen if everyone
* locks the key resources in the same order; but who knows.
* A solution is to use only one lock file in the gnupg homedir but
* what will happen with key resources which normally don't belong
* to the gpg homedir?
*/
static void
lock_rentry( RESTBL *rentry )
{
if( !rentry->lockhd ) {
rentry->lockhd = create_dotlock( rentry->fname );
if( !rentry->lockhd )
log_fatal("can't allocate lock for `%s'\n", rentry->fname );
rentry->is_locked = 0;
}
if( !rentry->is_locked ) {
if( make_dotlock( rentry->lockhd, -1 ) )
log_fatal("can't lock `%s'\n", rentry->fname );
rentry->is_locked = 1;
}
}
static void
unlock_rentry( RESTBL *rentry )
{
if( opt.lock_once )
return;
if( !release_dotlock( rentry->lockhd ) )
rentry->is_locked = 0;
}
/****************************************************************
****************** 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 = NULL;
int i;
char *filename = NULL;
int rc = 0;
enum resource_type rt = rt_UNKNOWN;
/* Do we have an URL?
* gnupg-kbxf:filename := this is a KBX file 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-kbxf:", 11 ) ) {
rt = rt_KBXF;
resname += 11;
}
#ifndef HAVE_DRIVE_LETTERS
else if( strchr( resname, ':' ) ) {
log_error("%s: invalid URL\n", url );
rc = GPGERR_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 = gcry_xstrdup( 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 = GPGERR_RESOURCE_LIMIT;
goto leave;
}
/* see whether we can determine the filetype */
if( rt == rt_UNKNOWN ) {
FILE *fp = fopen( filename, "rb" );
if( fp ) {
u32 magic;
if( fread( &magic, 4, 1, fp) == 1 ) {
char buf[8];
rt = rt_RING;
if( fread( buf, 8, 1, fp) == 1 ) {
if( !memcmp( buf+4, "KBXf", 4 )
&& buf[0] == 1 && buf[1] == 1 ) {
rt = rt_KBXF;
}
}
}
else /* maybe empty: assume ring */
rt = rt_RING;
fclose( fp );
}
else /* no file yet: create ring */
rt = rt_RING;
}
switch( rt ) {
case rt_UNKNOWN:
log_error("%s: unknown resource type\n", url );
rc = GPGERR_GENERAL;
goto leave;
case rt_RING:
case rt_KBXF:
iobuf = iobuf_open( filename );
if( !iobuf && !force ) {
rc = GPGERR_OPEN_FILE;
goto leave;
}
if( !iobuf ) {
char *last_slash_in_filename;
last_slash_in_filename = strrchr(filename, '/');
*last_slash_in_filename = 0;
if( access(filename, F_OK) ) {
/* on the first time we try to create the default homedir and
* in this case the process will be terminated, so that on the
* next invocation it can read the options file in on startup
*/
try_make_homedir( filename );
rc = GPGERR_OPEN_FILE;
goto leave;
}
*last_slash_in_filename = '/';
iobuf = iobuf_create( filename );
if( !iobuf ) {
log_error(_("%s: can't create keyring: %s\n"),
filename, strerror(errno));
rc = GPGERR_OPEN_FILE;
goto leave;
}
else {
#ifndef HAVE_DOSISH_SYSTEM
if( secret ) {
if( chmod( filename, S_IRUSR | S_IWUSR ) ) {
log_error("%s: chmod failed: %s\n",
filename, strerror(errno) );
rc = GPGERR_WRITE_FILE;
goto leave;
}
}
#endif
if( !opt.quiet )
log_info(_("%s: keyring created\n"), filename );
}
}
#if HAVE_DOSISH_SYSTEM || 1
iobuf_close( iobuf );
iobuf = NULL;
/* must close it again */
#endif
break;
default:
log_error("%s: unsupported resource type\n", url );
rc = GPGERR_GENERAL;
goto leave;
}
#ifndef HAVE_DOSISH_SYSTEM
#if 0 /* fixme: check directory permissions and print a warning */
if( secret ) {
}
#endif
#endif
/* fixme: avoid duplicate resources */
resource_table[i].used = 1;
resource_table[i].secret = !!secret;
resource_table[i].fname = gcry_xstrdup(filename);
resource_table[i].iobuf = iobuf;
resource_table[i].rt = rt;
if( secret )
default_secret_resource = i;
else
default_public_resource = i;
leave:
if( rc )
log_error("keyblock resource `%s': %s\n", filename, gpg_errstr(rc) );
else if( secret )
any_secret = 1;
else
any_public = 1;
gcry_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 = 0;
if( !filename )
i = secret? default_secret_resource : default_public_resource;
for(; 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;
kbpos->rt = resource_table[i].rt;
return 0;
}
}
}
return -1; /* not found */
}
/****************
* Return the filename of the firstkeyblock resource which is intended
* for write access. This will either be the default resource or in
* case this is not writable one of the others. If no writable is found,
* the default filename in the homedirectory will be returned.
* Caller must free, will never return NULL.
*/
char *
get_writable_keyblock_file( int secret )
{
int i = secret? default_secret_resource : default_public_resource;
if( resource_table[i].used && !resource_table[i].secret == !secret ) {
if( !access( resource_table[i].fname, R_OK|W_OK ) ) {
return gcry_xstrdup( resource_table[i].fname );
}
}
for(i=0; i < MAX_RESOURCES; i++ ) {
if( resource_table[i].used && !resource_table[i].secret == !secret ) {
if( !access( resource_table[i].fname, R_OK|W_OK ) ) {
return gcry_xstrdup( resource_table[i].fname );
}
}
}
/* Assume the home dir is always writable */
return make_filename(opt.homedir, secret? "secring.gpg"
: "pubring.gpg", NULL );
}
void
ringedit_copy_kbpos ( KBPOS d, KBPOS s )
{
*d = *s;
}
/****************
* 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()?
*/
static int
lock_keyblock( KBPOS kbpos )
{
if( !check_pos(kbpos) )
return GPGERR_GENERAL;
return 0;
}
/****************
* Release a lock on a keyblock
*/
static void
unlock_keyblock( KBPOS kbpos )
{
if( !check_pos(kbpos) )
BUG();
}
static int
enum_keyrings_open_helper( KBPOS kbpos, int where )
{
int i = where;
RESTBL *rentry;
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;
kbpos->valid = 0;
switch( kbpos->rt ) {
case rt_RING:
case rt_KBXF:
kbpos->fp = iobuf_open( rentry->fname );
if ( !kbpos->fp ) {
log_error("can't open `%s'\n", rentry->fname );
return GPGERR_OPEN_FILE;
}
break;
default: BUG();
}
kbpos->pkt = NULL;
return 0;
}
/****************
* This set of functions is used to scan over all keyrings.
* The mode in enum_keyblocks_next() is used liek this:
* Mode is: 1 = read
* 11 = read but skip signature and comment packets.
*/
int
enum_keyblocks_begin( KBPOS *rkbpos, int use_secret )
{
int rc, i;
KBPOS kbpos;
*rkbpos = NULL;
kbpos = gcry_xcalloc( 1, sizeof *kbpos );
kbpos->fp = NULL;
kbpos->rt = rt_UNKNOWN;
if( !use_secret ) {
kbpos->secret = 0;
i = 0;
}
else {
kbpos->secret = 1;
i = 0;
}
rc = enum_keyrings_open_helper( kbpos, i );
if ( rc ) {
gcry_free( kbpos );
return rc;
}
/* return the handle */
*rkbpos = kbpos;
return 0;
}
void
enum_keyblocks_end( KBPOS kbpos )
{
if ( !kbpos )
return;
switch( kbpos->rt ) {
case rt_RING:
case rt_KBXF:
if( kbpos->fp ) {
iobuf_close( kbpos->fp );
kbpos->fp = NULL;
}
break;
case rt_UNKNOWN:
/* this happens when we have no keyring at all */
gcry_free( kbpos );
return;
default:
BUG();
}
/* release pending packet */
free_packet( kbpos->pkt );
gcry_free( kbpos->pkt );
gcry_free( kbpos );
}
int
enum_keyblocks_next( KBPOS kbpos, int mode, KBNODE *ret_root )
{
int cont, rc = 0;
RESTBL *rentry;
if( mode != 1 && mode != 11 )
return GPGERR_INV_ARG;
do {
cont = 0;
switch( kbpos->rt ) {
case rt_RING:
if( !kbpos->fp )
return GPGERR_GENERAL;
rc = keyring_enum( kbpos, ret_root, mode == 11 );
break;
case rt_KBXF:
if( !kbpos->fp )
return GPGERR_GENERAL;
rc = do_kbxf_enum( kbpos, ret_root, mode == 11 );
break;
default: BUG();
}
if( rc == -1 ) {
RESTBL *rentry;
int i;
assert( !kbpos->pkt );
rentry = check_pos( kbpos );
assert(rentry);
i = kbpos->resno+1;
/* first close */
if( kbpos->fp ) {
iobuf_close( kbpos->fp );
kbpos->fp = NULL;
}
free_packet( kbpos->pkt );
gcry_free( kbpos->pkt );
kbpos->pkt = NULL;
/* and then open the next one */
rc = enum_keyrings_open_helper( kbpos, i );
if ( !rc )
cont = 1;
/* hmm, that is not really correct: if we got an error kbpos
* might be not well anymore */
}
} while(cont);
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( KBNODE root )
{
int rc;
#if 0
if( !check_pos(kbpos) )
return GPGERR_GENERAL;
switch( kbpos->rt ) {
case rt_RING:
rc = keyring_copy( kbpos, 1, root );
break;
case rt_KBXF:
rc = do_kbxf_copy( kbpos, 1, root );
break;
default: BUG();
}
#endif
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( KBNODE keyblock )
{
int rc;
#if 0
if( !check_pos(kbpos) )
return GPGERR_GENERAL;
switch( kbpos->rt ) {
case rt_RING:
rc = keyring_copy( kbpos, 2, NULL );
break;
case rt_KBXF:
rc = do_kbxf_copy( kbpos, 2, NULL );
break;
default: BUG();
}
#endif
return rc;
}
/****************
* Update the keyblock in the ring (or whatever resource) one in ROOT.
*/
int
update_keyblock( KBNODE root )
{
int rc;
struct keyblock_pos_struct kbpos;
/* We need to get the file position of original keyblock first */
if ( root->pkt->pkttype == PKT_PUBLIC_KEY )
rc = find_kblocation_bypk( &kbpos, root->pkt->pkt.public_key );
else if ( root->pkt->pkttype == PKT_SECRET_KEY )
rc = find_kblocation_bysk( &kbpos, root->pkt->pkt.secret_key );
else
BUG();
if ( rc )
return rc;
if( !check_pos(&kbpos) )
return GPGERR_GENERAL;
switch( kbpos.rt ) {
case rt_RING:
rc = keyring_copy( &kbpos, 3, root );
break;
case rt_KBXF:
rc = do_kbxf_copy( &kbpos, 3, root );
break;
default: BUG();
}
return rc;
}
/****************************************************************
********** Functions which operates on regular keyrings ********
****************************************************************/
static int
keyring_enum( KBPOS kbpos, KBNODE *ret_root, int skipsigs )
{
PACKET *pkt;
int rc;
RESTBL *rentry;
KBNODE root = NULL;
ulong offset, first_offset=0;
if( !(rentry=check_pos(kbpos)) )
return GPGERR_GENERAL;
if( kbpos->pkt ) {
root = new_kbnode( kbpos->pkt );
first_offset = kbpos->save_offset;
kbpos->pkt = NULL;
}
kbpos->valid = 0;
pkt = gcry_xmalloc( sizeof *pkt );
init_packet(pkt);
while( (rc=parse_packet(kbpos->fp, pkt, &offset )) != -1 ) {
if( rc ) { /* ignore errors */
if( rc != GPGERR_UNKNOWN_PACKET ) {
log_error("keyring_enum: read error: %s\n", gpg_errstr(rc) );
rc = GPGERR_INV_KEYRING;
goto ready;
}
free_packet( pkt );
init_packet( pkt );
continue;
}
/* make a linked list of all packets */
switch( pkt->pkttype ) {
case PKT_COMPRESSED:
log_error("skipped compressed packet in keyring\n" );
free_packet(pkt);
init_packet(pkt);
break;
case PKT_PUBLIC_KEY:
case PKT_SECRET_KEY:
if( root ) { /* save this packet */
kbpos->pkt = pkt;
kbpos->save_offset = offset;
pkt = NULL;
goto ready;
}
root = new_kbnode( pkt );
first_offset = offset;
pkt = gcry_xmalloc( 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 ) {
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 = gcry_xmalloc( sizeof *pkt );
init_packet(pkt);
break;
}
}
ready:
if( rc == -1 && root )
rc = 0;
if( rc )
release_kbnode( root );
else {
if ( root ) {
kbpos->offset = first_offset;
kbpos->valid = 1;
}
*ret_root = root;
}
free_packet( pkt );
gcry_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;
#warning We need to lock the keyring while we are editing it.
/* rethink this whole module */
if( !(rentry = check_pos( kbpos )) )
return GPGERR_GENERAL;
if( opt.dry_run )
return 0;
lock_rentry( rentry );
/* open the source file */
if( kbpos->fp ) {
/* BUG(); not allowed with such a handle */
log_debug("keyring_copy: closing fp %p\n", kbpos->fp );
iobuf_close (kbpos->fp);
kbpos->fp = NULL;
kbpos->valid = 0;
}
fp = iobuf_open( rentry->fname );
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));
unlock_rentry( rentry );
return GPGERR_OPEN_FILE;
}
else if( !opt.quiet )
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, gpg_errstr(rc) );
iobuf_cancel(newfp);
unlock_rentry( rentry );
return GPGERR_WRITE_FILE;
}
}
if( iobuf_close(newfp) ) {
log_error("%s: close failed: %s\n", rentry->fname, strerror(errno));
unlock_rentry( rentry );
return GPGERR_CLOSE_FILE;
}
if( chmod( rentry->fname, S_IRUSR | S_IWUSR ) ) {
log_error("%s: chmod failed: %s\n",
rentry->fname, strerror(errno) );
unlock_rentry( rentry );
return GPGERR_WRITE_FILE;
}
return 0;
}
if( !fp ) {
log_error("%s: can't open: %s\n", rentry->fname, strerror(errno) );
rc = GPGERR_OPEN_FILE;
goto leave;
}
/* create the new file */
#ifdef USE_ONLY_8DOT3
/* 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 = gcry_xmalloc( strlen( rentry->fname ) + 1 );
strcpy(bakfname,rentry->fname);
strcpy(bakfname+strlen(rentry->fname)-4, ".bak");
tmpfname = gcry_xmalloc( strlen( rentry->fname ) + 1 );
strcpy(tmpfname,rentry->fname);
strcpy(tmpfname+strlen(rentry->fname)-4, ".tmp");
}
else { /* file does not end with gpg; hmmm */
bakfname = gcry_xmalloc( strlen( rentry->fname ) + 5 );
strcpy(stpcpy(bakfname,rentry->fname),".bak");
tmpfname = gcry_xmalloc( strlen( rentry->fname ) + 5 );
strcpy(stpcpy(tmpfname,rentry->fname),".tmp");
}
#else
bakfname = gcry_xmalloc( strlen( rentry->fname ) + 2 );
strcpy(stpcpy(bakfname,rentry->fname),"~");
tmpfname = gcry_xmalloc( 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 = GPGERR_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, gpg_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, gpg_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, gpg_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, gpg_errstr(rc) );
iobuf_close(fp);
iobuf_cancel(newfp);
rc = GPGERR_WRITE_FILE;
goto leave;
}
}
kbpos->valid = 0;
}
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, gpg_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 = GPGERR_CLOSE_FILE;
goto leave;
}
if( iobuf_close(newfp) ) {
log_error("%s: close failed: %s\n", tmpfname, strerror(errno) );
rc = GPGERR_CLOSE_FILE;
goto leave;
}
/* if the new file is a secring, restrict the permissions */
#ifndef HAVE_DOSISH_SYSTEM
if( rentry->secret ) {
if( chmod( tmpfname, S_IRUSR | S_IWUSR ) ) {
log_error("%s: chmod failed: %s\n",
tmpfname, strerror(errno) );
rc = GPGERR_WRITE_FILE;
goto leave;
}
}
#endif
/* rename and make backup file */
if( !rentry->secret ) { /* but not for secret keyrings */
#ifdef HAVE_DOSISH_SYSTEM
remove( bakfname );
#endif
if( rename( rentry->fname, bakfname ) ) {
log_error("%s: rename to %s failed: %s\n",
rentry->fname, bakfname, strerror(errno) );
rc = GPGERR_RENAME_FILE;
goto leave;
}
}
#ifdef HAVE_DOSISH_SYSTEM
remove( rentry->fname );
#endif
if( rename( tmpfname, rentry->fname ) ) {
log_error("%s: rename to %s failed: %s\n",
tmpfname, rentry->fname,strerror(errno) );
rc = GPGERR_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:
unlock_rentry( rentry );
gcry_free(bakfname);
gcry_free(tmpfname);
return rc;
}
/****************************************************************
********** Functions which operate on KBX files ****************
****************************************************************/
static int
do_kbxf_enum( KBPOS kbpos, KBNODE *ret_root, int skipsigs )
{
PACKET *pkt;
int rc;
RESTBL *rentry;
KBNODE root = NULL;
if( !(rentry=check_pos(kbpos)) )
return GPGERR_GENERAL;
if( kbpos->pkt ) {
root = new_kbnode( kbpos->pkt );
kbpos->pkt = NULL;
}
pkt = gcry_xmalloc( sizeof *pkt );
init_packet(pkt);
while( (rc=parse_packet(kbpos->fp, pkt, NULL)) != -1 ) {
if( rc ) { /* ignore errors */
if( rc != GPGERR_UNKNOWN_PACKET ) {
log_error("do_kbxf_enum: read error: %s\n", gpg_errstr(rc) );
rc = GPGERR_INV_KEYRING;
goto ready;
}
free_packet( pkt );
init_packet( pkt );
continue;
}
/* make a linked list of all packets */
switch( pkt->pkttype ) {
case PKT_COMPRESSED:
log_error("skipped compressed packet in keyring\n" );
free_packet(pkt);
init_packet(pkt);
break;
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 = gcry_xmalloc( 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 ) {
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 = gcry_xmalloc( 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 );
gcry_free( pkt );
return rc;
}
/****************
* Perform insert/delete/update operation.
* mode 1 = insert
* 2 = delete
* 3 = update
*/
static int
do_kbxf_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 GPGERR_GENERAL;
if( kbpos->fp )
BUG(); /* not allowed with such a handle */
if( opt.dry_run )
return 0;
lock_rentry( rentry );
/* open the source file */
fp = iobuf_open( rentry->fname );
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));
unlock_rentry( rentry );
return GPGERR_OPEN_FILE;
}
else if( !opt.quiet )
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, gpg_errstr(rc) );
iobuf_cancel(newfp);
unlock_rentry( rentry );
return GPGERR_WRITE_FILE;
}
}
if( iobuf_close(newfp) ) {
log_error("%s: close failed: %s\n", rentry->fname, strerror(errno));
unlock_rentry( rentry );
return GPGERR_CLOSE_FILE;
}
if( chmod( rentry->fname, S_IRUSR | S_IWUSR ) ) {
log_error("%s: chmod failed: %s\n",
rentry->fname, strerror(errno) );
unlock_rentry( rentry );
return GPGERR_WRITE_FILE;
}
return 0;
}
if( !fp ) {
log_error("%s: can't open: %s\n", rentry->fname, strerror(errno) );
rc = GPGERR_OPEN_FILE;
goto leave;
}
/* create the new file */
#ifdef USE_ONLY_8DOT3
/* 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 = gcry_xmalloc( strlen( rentry->fname ) + 1 );
strcpy(bakfname,rentry->fname);
strcpy(bakfname+strlen(rentry->fname)-4, ".bak");
tmpfname = gcry_xmalloc( strlen( rentry->fname ) + 1 );
strcpy(tmpfname,rentry->fname);
strcpy(tmpfname+strlen(rentry->fname)-4, ".tmp");
}
else { /* file does not end with gpg; hmmm */
bakfname = gcry_xmalloc( strlen( rentry->fname ) + 5 );
strcpy(stpcpy(bakfname,rentry->fname),".bak");
tmpfname = gcry_xmalloc( strlen( rentry->fname ) + 5 );
strcpy(stpcpy(tmpfname,rentry->fname),".tmp");
}
#else
bakfname = gcry_xmalloc( strlen( rentry->fname ) + 2 );
strcpy(stpcpy(bakfname,rentry->fname),"~");
tmpfname = gcry_xmalloc( 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 = GPGERR_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, gpg_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, gpg_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, gpg_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, gpg_errstr(rc) );
iobuf_close(fp);
iobuf_cancel(newfp);
rc = GPGERR_WRITE_FILE;
goto leave;
}
}
kbpos->valid = 0;
}
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, gpg_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 = GPGERR_CLOSE_FILE;
goto leave;
}
if( iobuf_close(newfp) ) {
log_error("%s: close failed: %s\n", tmpfname, strerror(errno) );
rc = GPGERR_CLOSE_FILE;
goto leave;
}
/* if the new file is a secring, restrict the permissions */
#ifndef HAVE_DOSISH_SYSTEM
if( rentry->secret ) {
if( chmod( tmpfname, S_IRUSR | S_IWUSR ) ) {
log_error("%s: chmod failed: %s\n",
tmpfname, strerror(errno) );
rc = GPGERR_WRITE_FILE;
goto leave;
}
}
#endif
/* rename and make backup file */
if( !rentry->secret ) { /* but not for secret keyrings */
#ifdef HAVE_DOSISH_SYSTEM
remove( bakfname );
#endif
if( rename( rentry->fname, bakfname ) ) {
log_error("%s: rename to %s failed: %s\n",
rentry->fname, bakfname, strerror(errno) );
rc = GPGERR_RENAME_FILE;
goto leave;
}
}
#ifdef HAVE_DOSISH_SYSTEM
remove( rentry->fname );
#endif
if( rename( tmpfname, rentry->fname ) ) {
log_error("%s: rename to %s failed: %s\n",
tmpfname, rentry->fname,strerror(errno) );
rc = GPGERR_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:
unlock_rentry( rentry );
gcry_free(bakfname);
gcry_free(tmpfname);
return rc;
}