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sm: Change keydb code to use the keybox locking.

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* kbx/keybox-init.c (keybox_lock): New arg TIMEOUT.  Change all
callers to pass -1 when locking.
* sm/keydb.c (struct resource_item): Remove LOCKANDLE.
(struct keydb_handle): Add KEEP_LOCK.
(keydb_add_resource): Use keybox locking instead of a separate dotlock
for testing whether we can run a compress.
(keydb_release): Reset KEEP_LOCK.
(keydb_lock): Set KEEP_LOCK.
(unlock_all): Take care of KEEP_LOCK.
(lock_all): Use keybox_lock instead of dotlock fucntions.
(keydb_delete): Remove arg UNLOCK.
* sm/delete.c (delete_one): Adjust keydb_delete.  Due to the KEEP_LOCK
the keydb_release takes care of unlocking.
--

This aligns the code more with g10/keydb.c and avoids the separate
calls to dotlock_take.

GnuPG-bug-id: 4505
Signed-off-by: Werner Koch <wk@gnupg.org>
This commit is contained in:
Werner Koch 2019-05-14 13:36:08 +02:00
parent 54e96c6fd2
commit 22e274f839
No known key found for this signature in database
GPG Key ID: E3FDFF218E45B72B
6 changed files with 53 additions and 49 deletions
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8
g10/keydb.c
View File

@ -1,6 +1,6 @@
/* keydb.c - key database dispatcher
* Copyright (C) 2001-2013 Free Software Foundation, Inc.
* Coyrright (C) 2001-2015 Werner Koch
* Copyright (C) 2001-2015 Werner Koch
*
* This file is part of GnuPG.
*
@ -1076,7 +1076,7 @@ lock_all (KEYDB_HANDLE hd)
rc = keyring_lock (hd->active[i].u.kr, 1);
break;
case KEYDB_RESOURCE_TYPE_KEYBOX:
rc = keybox_lock (hd->active[i].u.kb, 1);
rc = keybox_lock (hd->active[i].u.kb, 1, -1);
break;
}
}
@ -1094,7 +1094,7 @@ lock_all (KEYDB_HANDLE hd)
keyring_lock (hd->active[i].u.kr, 0);
break;
case KEYDB_RESOURCE_TYPE_KEYBOX:
keybox_lock (hd->active[i].u.kb, 0);
keybox_lock (hd->active[i].u.kb, 0, 0);
break;
}
}
@ -1127,7 +1127,7 @@ unlock_all (KEYDB_HANDLE hd)
keyring_lock (hd->active[i].u.kr, 0);
break;
case KEYDB_RESOURCE_TYPE_KEYBOX:
keybox_lock (hd->active[i].u.kb, 0);
keybox_lock (hd->active[i].u.kb, 0, 0);
break;
}
}

13
kbx/keybox-init.c
View File

@ -261,10 +261,12 @@ _keybox_close_file (KEYBOX_HANDLE hd)
/*
* Lock the keybox at handle HD, or unlock if YES is false.
* Lock the keybox at handle HD, or unlock if YES is false. TIMEOUT
* is the value used for dotlock_take. In general -1 should be used
* when taking a lock; use 0 when releasing a lock.
*/
gpg_error_t
keybox_lock (KEYBOX_HANDLE hd, int yes)
keybox_lock (KEYBOX_HANDLE hd, int yes, long timeout)
{
gpg_error_t err = 0;
KB_NAME kb = hd->kb;
@ -302,10 +304,13 @@ keybox_lock (KEYBOX_HANDLE hd, int yes)
hd->fp = NULL;
}
#endif /*HAVE_W32_SYSTEM*/
if (dotlock_take (kb->lockhd, -1))
if (dotlock_take (kb->lockhd, timeout))
{
err = gpg_error_from_syserror ();
log_info ("can't lock '%s'\n", kb->fname );
if (!timeout && gpg_err_code (err) == GPG_ERR_EACCES)
; /* No diagnostic if we only tried to lock. */
else
log_info ("can't lock '%s'\n", kb->fname );
}
else
kb->is_locked = 1;

2
kbx/keybox.h
View File

@ -76,7 +76,7 @@ void keybox_pop_found_state (KEYBOX_HANDLE hd);
const char *keybox_get_resource_name (KEYBOX_HANDLE hd);
int keybox_set_ephemeral (KEYBOX_HANDLE hd, int yes);
gpg_error_t keybox_lock (KEYBOX_HANDLE hd, int yes);
gpg_error_t keybox_lock (KEYBOX_HANDLE hd, int yes, long timeout);
/*-- keybox-file.c --*/
/* Fixme: This function does not belong here: Provide a better

5
sm/delete.c
View File

@ -113,7 +113,8 @@ delete_one (ctrl_t ctrl, const char *username)
goto leave;
}
/* We need to search again to get back to the right position. */
/* We need to search again to get back to the right position. Neo
* that the lock is kept until the KH is released. */
rc = keydb_lock (kh);
if (rc)
{
@ -132,7 +133,7 @@ delete_one (ctrl_t ctrl, const char *username)
goto leave;
}
rc = keydb_delete (kh, duplicates ? 0 : 1);
rc = keydb_delete (kh);
if (rc)
goto leave;
if (opt.verbose)

72
sm/keydb.c
View File

@ -47,7 +47,6 @@ struct resource_item {
KEYBOX_HANDLE kr;
} u;
void *token;
dotlock_t lockhandle;
};
static struct resource_item all_resources[MAX_KEYDB_RESOURCES];
@ -58,7 +57,14 @@ static int any_registered;
struct keydb_handle {
/* If this flag is set the resources is locked. */
int locked;
/* If this flag is set a lock will only be released by
* keydb_release. */
int keep_lock;
int found;
int saved_found;
int current;
@ -346,26 +352,20 @@ keydb_add_resource (ctrl_t ctrl, const char *url, int force, int *auto_created)
err = gpg_error (GPG_ERR_RESOURCE_LIMIT);
else
{
KEYBOX_HANDLE kbxhd;
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].lockhandle
= dotlock_create (filename, 0);
if (!all_resources[used_resources].lockhandle)
log_fatal ( _("can't create lock for '%s'\n"), filename);
/* Do a compress run if needed and the file is not locked. */
if (!dotlock_take (all_resources[used_resources].lockhandle, 0))
/* Do a compress run if needed and the keybox is not locked. */
kbxhd = keybox_new_x509 (token, 0);
if (kbxhd)
{
KEYBOX_HANDLE kbxhd = keybox_new_x509 (token, 0);
if (!keybox_lock (kbxhd, 1, 0))
keybox_compress (kbxhd);
if (kbxhd)
{
keybox_compress (kbxhd);
keybox_release (kbxhd);
}
dotlock_release (all_resources[used_resources].lockhandle);
keybox_release (kbxhd);
}
used_resources++;
@ -415,7 +415,6 @@ keydb_new (void)
case KEYDB_RESOURCE_TYPE_KEYBOX:
hd->active[j].type = all_resources[i].type;
hd->active[j].token = all_resources[i].token;
hd->active[j].lockhandle = all_resources[i].lockhandle;
hd->active[j].u.kr = keybox_new_x509 (all_resources[i].token, 0);
if (!hd->active[j].u.kr)
{
@ -442,6 +441,7 @@ keydb_release (KEYDB_HANDLE hd)
assert (active_handles > 0);
active_handles--;
hd->keep_lock = 0;
unlock_all (hd);
for (i=0; i < hd->used; i++)
{
@ -526,17 +526,22 @@ keydb_set_ephemeral (KEYDB_HANDLE hd, int yes)
/* If the keyring has not yet been locked, lock it now. This
operation is required before any update operation; it is optional
for an insert operation. The lock is released with
keydb_released. */
* operation is required before any update operation; it is optional
* for an insert operation. The lock is kept until a keydb_release so
* that internal unlock_all calls have no effect. */
gpg_error_t
keydb_lock (KEYDB_HANDLE hd)
{
gpg_error_t err;
if (!hd)
return gpg_error (GPG_ERR_INV_HANDLE);
if (hd->locked)
return 0; /* Already locked. */
return lock_all (hd);
err = lock_all (hd);
if (!err)
hd->keep_lock = 1;
return err;
}
@ -556,8 +561,7 @@ lock_all (KEYDB_HANDLE hd)
case KEYDB_RESOURCE_TYPE_NONE:
break;
case KEYDB_RESOURCE_TYPE_KEYBOX:
if (hd->active[i].lockhandle)
rc = dotlock_take (hd->active[i].lockhandle, -1);
rc = keybox_lock (hd->active[i].u.kr, 1, -1);
break;
}
if (rc)
@ -566,7 +570,7 @@ lock_all (KEYDB_HANDLE hd)
if (rc)
{
/* revert the already set locks */
/* Revert the already set locks. */
for (i--; i >= 0; i--)
{
switch (hd->active[i].type)
@ -574,8 +578,7 @@ lock_all (KEYDB_HANDLE hd)
case KEYDB_RESOURCE_TYPE_NONE:
break;
case KEYDB_RESOURCE_TYPE_KEYBOX:
if (hd->active[i].lockhandle)
dotlock_release (hd->active[i].lockhandle);
keybox_lock (hd->active[i].u.kr, 0, 0);
break;
}
}
@ -583,10 +586,7 @@ lock_all (KEYDB_HANDLE hd)
else
hd->locked = 1;
/* make_dotlock () does not yet guarantee that errno is set, thus
we can't rely on the error reason and will simply use
EACCES. */
return rc? gpg_error (GPG_ERR_EACCES) : 0;
return rc;
}
static void
@ -594,7 +594,7 @@ unlock_all (KEYDB_HANDLE hd)
{
int i;
if (!hd->locked)
if (!hd->locked || hd->keep_lock)
return;
for (i=hd->used-1; i >= 0; i--)
@ -604,8 +604,7 @@ unlock_all (KEYDB_HANDLE hd)
case KEYDB_RESOURCE_TYPE_NONE:
break;
case KEYDB_RESOURCE_TYPE_KEYBOX:
if (hd->active[i].lockhandle)
dotlock_release (hd->active[i].lockhandle);
keybox_lock (hd->active[i].u.kr, 0, 0);
break;
}
}
@ -840,7 +839,7 @@ keydb_update_cert (KEYDB_HANDLE hd, ksba_cert_t cert)
* The current keyblock or cert will be deleted.
*/
int
keydb_delete (KEYDB_HANDLE hd, int unlock)
keydb_delete (KEYDB_HANDLE hd)
{
int rc = -1;
@ -866,8 +865,7 @@ keydb_delete (KEYDB_HANDLE hd, int unlock)
break;
}
if (unlock)
unlock_all (hd);
unlock_all (hd);
return rc;
}

2
sm/keydb.h
View File

@ -49,7 +49,7 @@ int keydb_get_cert (KEYDB_HANDLE hd, ksba_cert_t *r_cert);
int keydb_insert_cert (KEYDB_HANDLE hd, ksba_cert_t cert);
int keydb_update_cert (KEYDB_HANDLE hd, ksba_cert_t cert);
int keydb_delete (KEYDB_HANDLE hd, int unlock);
int keydb_delete (KEYDB_HANDLE hd);
int keydb_locate_writable (KEYDB_HANDLE hd, const char *reserved);
void keydb_rebuild_caches (void);