mirror of
git://git.gnupg.org/gnupg.git
synced 2024-11-04 20:38:50 +01:00
208509950c
signature caches to prevent another gpg from tampering with the temporary copy. * keydb.c: Double the maximum number of keyrings to 40. * parse-packet.c (dump_sig_subpkt): Show the notation names for not-human-readable notations. Fix cosmetic off-by-one length counter.
694 lines
16 KiB
C
694 lines
16 KiB
C
/* keydb.c - key database dispatcher
|
||
* Copyright (C) 2001, 2002, 2003 Free Software Foundation, Inc.
|
||
*
|
||
* This file is part of GnuPG.
|
||
*
|
||
* GnuPG is free software; you can redistribute it and/or modify
|
||
* it under the terms of the GNU General Public License as published by
|
||
* the Free Software Foundation; either version 2 of the License, or
|
||
* (at your option) any later version.
|
||
*
|
||
* GnuPG is distributed in the hope that it will be useful,
|
||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
* GNU General Public License for more details.
|
||
*
|
||
* You should have received a copy of the GNU General Public License
|
||
* along with this program; if not, write to the Free Software
|
||
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
|
||
*/
|
||
|
||
#include <config.h>
|
||
#include <stdio.h>
|
||
#include <stdlib.h>
|
||
#include <string.h>
|
||
#include <errno.h>
|
||
#include <assert.h>
|
||
#include <sys/types.h>
|
||
#include <sys/stat.h>
|
||
#include <unistd.h>
|
||
|
||
#include "util.h"
|
||
#include "options.h"
|
||
#include "main.h" /*try_make_homedir ()*/
|
||
#include "packet.h"
|
||
#include "keyring.h"
|
||
#include "keydb.h"
|
||
#include "i18n.h"
|
||
|
||
static int active_handles;
|
||
|
||
typedef enum {
|
||
KEYDB_RESOURCE_TYPE_NONE = 0,
|
||
KEYDB_RESOURCE_TYPE_KEYRING
|
||
} KeydbResourceType;
|
||
#define MAX_KEYDB_RESOURCES 40
|
||
|
||
struct resource_item {
|
||
KeydbResourceType type;
|
||
union {
|
||
KEYRING_HANDLE kr;
|
||
} u;
|
||
void *token;
|
||
int secret;
|
||
};
|
||
|
||
static struct resource_item all_resources[MAX_KEYDB_RESOURCES];
|
||
static int used_resources;
|
||
|
||
struct keydb_handle {
|
||
int locked;
|
||
int found;
|
||
int current;
|
||
int used; /* items in active */
|
||
struct resource_item active[MAX_KEYDB_RESOURCES];
|
||
};
|
||
|
||
|
||
static int lock_all (KEYDB_HANDLE hd);
|
||
static void unlock_all (KEYDB_HANDLE hd);
|
||
|
||
|
||
/*
|
||
* 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
|
||
keydb_add_resource (const char *url, int force, int secret)
|
||
{
|
||
static int any_secret, any_public;
|
||
const char *resname = url;
|
||
IOBUF iobuf = NULL;
|
||
char *filename = NULL;
|
||
int rc = 0;
|
||
KeydbResourceType rt = KEYDB_RESOURCE_TYPE_NONE;
|
||
void *token;
|
||
|
||
/* Do we have an URL?
|
||
* 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 = KEYDB_RESOURCE_TYPE_KEYRING;
|
||
resname += 11;
|
||
}
|
||
#if !defined(HAVE_DRIVE_LETTERS) && !defined(__riscos__)
|
||
else if (strchr (resname, ':')) {
|
||
log_error ("invalid key resource URL `%s'\n", url );
|
||
rc = G10ERR_GENERAL;
|
||
goto leave;
|
||
}
|
||
#endif /* !HAVE_DRIVE_LETTERS && !__riscos__ */
|
||
}
|
||
|
||
if (*resname != DIRSEP_C ) { /* do tilde expansion etc */
|
||
if (strchr(resname, DIRSEP_C) )
|
||
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;
|
||
|
||
/* see whether we can determine the filetype */
|
||
if (rt == KEYDB_RESOURCE_TYPE_NONE) {
|
||
FILE *fp = fopen( filename, "rb" );
|
||
|
||
if (fp) {
|
||
u32 magic;
|
||
|
||
if (fread( &magic, 4, 1, fp) == 1 ) {
|
||
if (magic == 0x13579ace || magic == 0xce9a5713)
|
||
; /* GDBM magic - no more support */
|
||
else
|
||
rt = KEYDB_RESOURCE_TYPE_KEYRING;
|
||
}
|
||
else /* maybe empty: assume ring */
|
||
rt = KEYDB_RESOURCE_TYPE_KEYRING;
|
||
fclose( fp );
|
||
}
|
||
else /* no file yet: create ring */
|
||
rt = KEYDB_RESOURCE_TYPE_KEYRING;
|
||
}
|
||
|
||
switch (rt) {
|
||
case KEYDB_RESOURCE_TYPE_NONE:
|
||
log_error ("unknown type of key resource `%s'\n", url );
|
||
rc = G10ERR_GENERAL;
|
||
goto leave;
|
||
|
||
case KEYDB_RESOURCE_TYPE_KEYRING:
|
||
if (access(filename, F_OK))
|
||
{ /* file does not exist */
|
||
mode_t oldmask;
|
||
char *last_slash_in_filename;
|
||
|
||
if (!force)
|
||
{
|
||
rc = G10ERR_OPEN_FILE;
|
||
goto leave;
|
||
}
|
||
|
||
last_slash_in_filename = strrchr (filename, DIRSEP_C);
|
||
*last_slash_in_filename = 0;
|
||
if (access(filename, F_OK))
|
||
{ /* On the first time we try to create the default
|
||
homedir and check again. */
|
||
static int tried;
|
||
|
||
if (!tried)
|
||
{
|
||
tried = 1;
|
||
try_make_homedir (filename);
|
||
}
|
||
if (access (filename, F_OK))
|
||
{
|
||
rc = G10ERR_OPEN_FILE;
|
||
*last_slash_in_filename = DIRSEP_C;
|
||
goto leave;
|
||
}
|
||
}
|
||
*last_slash_in_filename = DIRSEP_C;
|
||
|
||
oldmask=umask(077);
|
||
iobuf = iobuf_create (filename);
|
||
umask(oldmask);
|
||
if (!iobuf)
|
||
{
|
||
log_error ( _("error creating keyring `%s': %s\n"),
|
||
filename, strerror(errno));
|
||
rc = G10ERR_OPEN_FILE;
|
||
goto leave;
|
||
}
|
||
|
||
if (!opt.quiet)
|
||
log_info (_("keyring `%s' created\n"), filename);
|
||
iobuf_close (iobuf);
|
||
iobuf = NULL;
|
||
/* must invalidate that ugly cache */
|
||
iobuf_ioctl (NULL, 2, 0, (char*)filename);
|
||
} /* end file creation */
|
||
|
||
token = keyring_register_filename (filename, secret);
|
||
if (!token)
|
||
; /* already registered - ignore it */
|
||
else if (used_resources >= MAX_KEYDB_RESOURCES)
|
||
rc = G10ERR_RESOURCE_LIMIT;
|
||
else
|
||
{
|
||
all_resources[used_resources].type = rt;
|
||
all_resources[used_resources].u.kr = NULL; /* Not used here */
|
||
all_resources[used_resources].token = token;
|
||
all_resources[used_resources].secret = secret;
|
||
used_resources++;
|
||
}
|
||
break;
|
||
|
||
default:
|
||
log_error ("resource type of `%s' not supported\n", url);
|
||
rc = G10ERR_GENERAL;
|
||
goto leave;
|
||
}
|
||
|
||
/* fixme: check directory permissions and print a warning */
|
||
|
||
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;
|
||
}
|
||
|
||
|
||
|
||
|
||
KEYDB_HANDLE
|
||
keydb_new (int secret)
|
||
{
|
||
KEYDB_HANDLE hd;
|
||
int i, j;
|
||
|
||
hd = m_alloc_clear (sizeof *hd);
|
||
hd->found = -1;
|
||
|
||
assert (used_resources <= MAX_KEYDB_RESOURCES);
|
||
for (i=j=0; i < used_resources; i++)
|
||
{
|
||
if (!all_resources[i].secret != !secret)
|
||
continue;
|
||
switch (all_resources[i].type)
|
||
{
|
||
case KEYDB_RESOURCE_TYPE_NONE: /* ignore */
|
||
break;
|
||
case KEYDB_RESOURCE_TYPE_KEYRING:
|
||
hd->active[j].type = all_resources[i].type;
|
||
hd->active[j].token = all_resources[i].token;
|
||
hd->active[j].secret = all_resources[i].secret;
|
||
hd->active[j].u.kr = keyring_new (all_resources[i].token, secret);
|
||
if (!hd->active[j].u.kr) {
|
||
m_free (hd);
|
||
return NULL; /* fixme: release all previously allocated handles*/
|
||
}
|
||
j++;
|
||
break;
|
||
}
|
||
}
|
||
hd->used = j;
|
||
|
||
active_handles++;
|
||
return hd;
|
||
}
|
||
|
||
void
|
||
keydb_release (KEYDB_HANDLE hd)
|
||
{
|
||
int i;
|
||
|
||
if (!hd)
|
||
return;
|
||
assert (active_handles > 0);
|
||
active_handles--;
|
||
|
||
unlock_all (hd);
|
||
for (i=0; i < hd->used; i++) {
|
||
switch (hd->active[i].type) {
|
||
case KEYDB_RESOURCE_TYPE_NONE:
|
||
break;
|
||
case KEYDB_RESOURCE_TYPE_KEYRING:
|
||
keyring_release (hd->active[i].u.kr);
|
||
break;
|
||
}
|
||
}
|
||
|
||
m_free (hd);
|
||
}
|
||
|
||
|
||
/*
|
||
* Return the name of the current resource. This is function first
|
||
* looks for the last found found, then for the current search
|
||
* position, and last returns the first available resource. The
|
||
* returned string is only valid as long as the handle exists. This
|
||
* function does only return NULL if no handle is specified, in all
|
||
* other error cases an empty string is returned.
|
||
*/
|
||
const char *
|
||
keydb_get_resource_name (KEYDB_HANDLE hd)
|
||
{
|
||
int idx;
|
||
const char *s = NULL;
|
||
|
||
if (!hd)
|
||
return NULL;
|
||
|
||
if ( hd->found >= 0 && hd->found < hd->used)
|
||
idx = hd->found;
|
||
else if ( hd->current >= 0 && hd->current < hd->used)
|
||
idx = hd->current;
|
||
else
|
||
idx = 0;
|
||
|
||
switch (hd->active[idx].type) {
|
||
case KEYDB_RESOURCE_TYPE_NONE:
|
||
s = NULL;
|
||
break;
|
||
case KEYDB_RESOURCE_TYPE_KEYRING:
|
||
s = keyring_get_resource_name (hd->active[idx].u.kr);
|
||
break;
|
||
}
|
||
|
||
return s? s: "";
|
||
}
|
||
|
||
|
||
|
||
static int
|
||
lock_all (KEYDB_HANDLE hd)
|
||
{
|
||
int i, rc = 0;
|
||
|
||
for (i=0; !rc && i < hd->used; i++) {
|
||
switch (hd->active[i].type) {
|
||
case KEYDB_RESOURCE_TYPE_NONE:
|
||
break;
|
||
case KEYDB_RESOURCE_TYPE_KEYRING:
|
||
rc = keyring_lock (hd->active[i].u.kr, 1);
|
||
break;
|
||
}
|
||
}
|
||
|
||
if (rc) {
|
||
/* revert the already set locks */
|
||
for (i--; i >= 0; i--) {
|
||
switch (hd->active[i].type) {
|
||
case KEYDB_RESOURCE_TYPE_NONE:
|
||
break;
|
||
case KEYDB_RESOURCE_TYPE_KEYRING:
|
||
keyring_lock (hd->active[i].u.kr, 0);
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
else
|
||
hd->locked = 1;
|
||
|
||
return rc;
|
||
}
|
||
|
||
static void
|
||
unlock_all (KEYDB_HANDLE hd)
|
||
{
|
||
int i;
|
||
|
||
if (!hd->locked)
|
||
return;
|
||
|
||
for (i=hd->used-1; i >= 0; i--) {
|
||
switch (hd->active[i].type) {
|
||
case KEYDB_RESOURCE_TYPE_NONE:
|
||
break;
|
||
case KEYDB_RESOURCE_TYPE_KEYRING:
|
||
keyring_lock (hd->active[i].u.kr, 0);
|
||
break;
|
||
}
|
||
}
|
||
hd->locked = 0;
|
||
}
|
||
|
||
|
||
/*
|
||
* Return the last found keyring. Caller must free it.
|
||
* The returned keyblock has the kbode flag bit 0 set for the node with
|
||
* the public key used to locate the keyblock or flag bit 1 set for
|
||
* the user ID node.
|
||
*/
|
||
int
|
||
keydb_get_keyblock (KEYDB_HANDLE hd, KBNODE *ret_kb)
|
||
{
|
||
int rc = 0;
|
||
|
||
if (!hd)
|
||
return G10ERR_INV_ARG;
|
||
|
||
if ( hd->found < 0 || hd->found >= hd->used)
|
||
return -1; /* nothing found */
|
||
|
||
switch (hd->active[hd->found].type) {
|
||
case KEYDB_RESOURCE_TYPE_NONE:
|
||
rc = G10ERR_GENERAL; /* oops */
|
||
break;
|
||
case KEYDB_RESOURCE_TYPE_KEYRING:
|
||
rc = keyring_get_keyblock (hd->active[hd->found].u.kr, ret_kb);
|
||
break;
|
||
}
|
||
|
||
return rc;
|
||
}
|
||
|
||
/*
|
||
* update the current keyblock with KB
|
||
*/
|
||
int
|
||
keydb_update_keyblock (KEYDB_HANDLE hd, KBNODE kb)
|
||
{
|
||
int rc = 0;
|
||
|
||
if (!hd)
|
||
return G10ERR_INV_ARG;
|
||
|
||
if ( hd->found < 0 || hd->found >= hd->used)
|
||
return -1; /* nothing found */
|
||
|
||
if( opt.dry_run )
|
||
return 0;
|
||
|
||
rc = lock_all (hd);
|
||
if (rc)
|
||
return rc;
|
||
|
||
switch (hd->active[hd->found].type) {
|
||
case KEYDB_RESOURCE_TYPE_NONE:
|
||
rc = G10ERR_GENERAL; /* oops */
|
||
break;
|
||
case KEYDB_RESOURCE_TYPE_KEYRING:
|
||
rc = keyring_update_keyblock (hd->active[hd->found].u.kr, kb);
|
||
break;
|
||
}
|
||
|
||
unlock_all (hd);
|
||
return rc;
|
||
}
|
||
|
||
|
||
/*
|
||
* Insert a new KB into one of the resources.
|
||
*/
|
||
int
|
||
keydb_insert_keyblock (KEYDB_HANDLE hd, KBNODE kb)
|
||
{
|
||
int rc = -1;
|
||
int idx;
|
||
|
||
if (!hd)
|
||
return G10ERR_INV_ARG;
|
||
|
||
if( opt.dry_run )
|
||
return 0;
|
||
|
||
if ( hd->found >= 0 && hd->found < hd->used)
|
||
idx = hd->found;
|
||
else if ( hd->current >= 0 && hd->current < hd->used)
|
||
idx = hd->current;
|
||
else
|
||
return G10ERR_GENERAL;
|
||
|
||
rc = lock_all (hd);
|
||
if (rc)
|
||
return rc;
|
||
|
||
switch (hd->active[idx].type) {
|
||
case KEYDB_RESOURCE_TYPE_NONE:
|
||
rc = G10ERR_GENERAL; /* oops */
|
||
break;
|
||
case KEYDB_RESOURCE_TYPE_KEYRING:
|
||
rc = keyring_insert_keyblock (hd->active[idx].u.kr, kb);
|
||
break;
|
||
}
|
||
|
||
unlock_all (hd);
|
||
return rc;
|
||
}
|
||
|
||
|
||
/*
|
||
* The current keyblock will be deleted.
|
||
*/
|
||
int
|
||
keydb_delete_keyblock (KEYDB_HANDLE hd)
|
||
{
|
||
int rc = -1;
|
||
|
||
if (!hd)
|
||
return G10ERR_INV_ARG;
|
||
|
||
if ( hd->found < 0 || hd->found >= hd->used)
|
||
return -1; /* nothing found */
|
||
|
||
if( opt.dry_run )
|
||
return 0;
|
||
|
||
rc = lock_all (hd);
|
||
if (rc)
|
||
return rc;
|
||
|
||
switch (hd->active[hd->found].type) {
|
||
case KEYDB_RESOURCE_TYPE_NONE:
|
||
rc = G10ERR_GENERAL; /* oops */
|
||
break;
|
||
case KEYDB_RESOURCE_TYPE_KEYRING:
|
||
rc = keyring_delete_keyblock (hd->active[hd->found].u.kr);
|
||
break;
|
||
}
|
||
|
||
unlock_all (hd);
|
||
return rc;
|
||
}
|
||
|
||
|
||
/*
|
||
* Locate the default writable key resource, so that the next
|
||
* operation (which is only relevant for inserts) will be done on this
|
||
* resource.
|
||
*/
|
||
int
|
||
keydb_locate_writable (KEYDB_HANDLE hd, const char *reserved)
|
||
{
|
||
int rc;
|
||
|
||
if (!hd)
|
||
return G10ERR_INV_ARG;
|
||
|
||
rc = keydb_search_reset (hd); /* this does reset hd->current */
|
||
if (rc)
|
||
return rc;
|
||
|
||
for ( ; hd->current >= 0 && hd->current < hd->used; hd->current++)
|
||
{
|
||
switch (hd->active[hd->current].type)
|
||
{
|
||
case KEYDB_RESOURCE_TYPE_NONE:
|
||
BUG();
|
||
break;
|
||
case KEYDB_RESOURCE_TYPE_KEYRING:
|
||
if (keyring_is_writable (hd->active[hd->current].token))
|
||
return 0; /* found (hd->current is set to it) */
|
||
break;
|
||
}
|
||
}
|
||
|
||
return -1;
|
||
}
|
||
|
||
/*
|
||
* Rebuild the caches of all key resources.
|
||
*/
|
||
void
|
||
keydb_rebuild_caches (void)
|
||
{
|
||
int i, rc;
|
||
|
||
for (i=0; i < used_resources; i++)
|
||
{
|
||
if (all_resources[i].secret)
|
||
continue;
|
||
switch (all_resources[i].type)
|
||
{
|
||
case KEYDB_RESOURCE_TYPE_NONE: /* ignore */
|
||
break;
|
||
case KEYDB_RESOURCE_TYPE_KEYRING:
|
||
rc = keyring_rebuild_cache (all_resources[i].token);
|
||
if (rc)
|
||
log_error (_("failed to rebuild keyring cache: %s\n"),
|
||
g10_errstr (rc));
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
|
||
|
||
/*
|
||
* Start the next search on this handle right at the beginning
|
||
*/
|
||
int
|
||
keydb_search_reset (KEYDB_HANDLE hd)
|
||
{
|
||
int i, rc = 0;
|
||
|
||
if (!hd)
|
||
return G10ERR_INV_ARG;
|
||
|
||
hd->current = 0;
|
||
hd->found = -1;
|
||
/* and reset all resources */
|
||
for (i=0; !rc && i < hd->used; i++) {
|
||
switch (hd->active[i].type) {
|
||
case KEYDB_RESOURCE_TYPE_NONE:
|
||
break;
|
||
case KEYDB_RESOURCE_TYPE_KEYRING:
|
||
rc = keyring_search_reset (hd->active[i].u.kr);
|
||
break;
|
||
}
|
||
}
|
||
return rc;
|
||
}
|
||
|
||
|
||
/*
|
||
* Search through all keydb resources, starting at the current position,
|
||
* for a keyblock which contains one of the keys described in the DESC array.
|
||
*/
|
||
int
|
||
keydb_search (KEYDB_HANDLE hd, KEYDB_SEARCH_DESC *desc, size_t ndesc)
|
||
{
|
||
int rc = -1;
|
||
|
||
if (!hd)
|
||
return G10ERR_INV_ARG;
|
||
|
||
while (rc == -1 && hd->current >= 0 && hd->current < hd->used) {
|
||
switch (hd->active[hd->current].type) {
|
||
case KEYDB_RESOURCE_TYPE_NONE:
|
||
BUG(); /* we should never see it here */
|
||
break;
|
||
case KEYDB_RESOURCE_TYPE_KEYRING:
|
||
rc = keyring_search (hd->active[hd->current].u.kr, desc, ndesc);
|
||
break;
|
||
}
|
||
if (rc == -1) /* EOF -> switch to next resource */
|
||
hd->current++;
|
||
else if (!rc)
|
||
hd->found = hd->current;
|
||
}
|
||
|
||
return rc;
|
||
}
|
||
|
||
|
||
int
|
||
keydb_search_first (KEYDB_HANDLE hd)
|
||
{
|
||
KEYDB_SEARCH_DESC desc;
|
||
|
||
memset (&desc, 0, sizeof desc);
|
||
desc.mode = KEYDB_SEARCH_MODE_FIRST;
|
||
return keydb_search (hd, &desc, 1);
|
||
}
|
||
|
||
int
|
||
keydb_search_next (KEYDB_HANDLE hd)
|
||
{
|
||
KEYDB_SEARCH_DESC desc;
|
||
|
||
memset (&desc, 0, sizeof desc);
|
||
desc.mode = KEYDB_SEARCH_MODE_NEXT;
|
||
return keydb_search (hd, &desc, 1);
|
||
}
|
||
|
||
int
|
||
keydb_search_kid (KEYDB_HANDLE hd, u32 *kid)
|
||
{
|
||
KEYDB_SEARCH_DESC desc;
|
||
|
||
memset (&desc, 0, sizeof desc);
|
||
desc.mode = KEYDB_SEARCH_MODE_LONG_KID;
|
||
desc.u.kid[0] = kid[0];
|
||
desc.u.kid[1] = kid[1];
|
||
return keydb_search (hd, &desc, 1);
|
||
}
|
||
|
||
int
|
||
keydb_search_fpr (KEYDB_HANDLE hd, const byte *fpr)
|
||
{
|
||
KEYDB_SEARCH_DESC desc;
|
||
|
||
memset (&desc, 0, sizeof desc);
|
||
desc.mode = KEYDB_SEARCH_MODE_FPR;
|
||
memcpy (desc.u.fpr, fpr, MAX_FINGERPRINT_LEN);
|
||
return keydb_search (hd, &desc, 1);
|
||
}
|
||
|
||
|
||
|