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agent: Fix passphrase cache lookups.

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CACHE_MODE_ANY is supposed to match any cache mode except
CACHE_MODE_IGNORE, but the code used '==' to compare cache modes.

* agent/cache.c (cache_mode_equal): New function.
(agent_set_cache): Use the new function to compare cache modes.
(agent_get_cache): Likewise.
* tests/openpgp/Makefile.am (TESTS): Add new test.
* tests/openpgp/issue2015.scm: New file.

GnuPG-bug-id: 2015
Signed-off-by: Justus Winter <justus@g10code.com>
This commit is contained in:
Justus Winter 2016-07-18 12:51:38 +02:00
parent 7f4dd24b88
commit f474249366
3 changed files with 41 additions and 2 deletions
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13
agent/cache.c
View File

@ -299,6 +299,15 @@ agent_flush_cache (void)
}
/* Compare two cache modes. */
static int
cache_mode_equal (cache_mode_t a, cache_mode_t b)
{
/* CACHE_MODE_ANY matches any mode other than CACHE_MODE_IGNORE. */
return ((a == CACHE_MODE_ANY && b != CACHE_MODE_IGNORE)
|| (b == CACHE_MODE_ANY && a != CACHE_MODE_IGNORE) || a == b);
}
/* Store the string DATA in the cache under KEY and mark it with a
maximum lifetime of TTL seconds. If there is already data under
@ -333,7 +342,7 @@ agent_put_cache (const char *key, cache_mode_t cache_mode,
{
if (((cache_mode != CACHE_MODE_USER
&& cache_mode != CACHE_MODE_NONCE)
|| r->cache_mode == cache_mode)
|| cache_mode_equal (r->cache_mode, cache_mode))
&& !strcmp (r->key, key))
break;
}
@ -416,7 +425,7 @@ agent_get_cache (const char *key, cache_mode_t cache_mode)
if (r->pw
&& ((cache_mode != CACHE_MODE_USER
&& cache_mode != CACHE_MODE_NONCE)
|| r->cache_mode == cache_mode)
|| cache_mode_equal (r->cache_mode, cache_mode))
&& !strcmp (r->key, key))
{
/* Note: To avoid races KEY may not be accessed anymore below. */

1
tests/openpgp/Makefile.am
View File

@ -81,6 +81,7 @@ TESTS = setup.scm \
use-exact-key.scm \
default-key.scm \
export.scm \
issue2015.scm \
finish.scm

29
tests/openpgp/issue2015.scm Executable file
View File

@ -0,0 +1,29 @@
#!/usr/bin/env gpgscm
;; Copyright (C) 2016 g10 Code GmbH
;;
;; 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 3 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, see <http://www.gnu.org/licenses/>.
(load (with-path "defs.scm"))
(info "Checking passphrase cache (issue2015)...")
(call-check `(,(tool 'gpg-preset-passphrase)
--preset --passphrase some_passphrase some_id))
(let ((response (call-popen `(,(tool 'gpg-connect-agent))
"GET_PASSPHRASE --no-ask some_id X X X")))
(unless (string=? response "OK 736F6D655F70617373706872617365\n")
(error "Could not retrieve passphrase from cache:" response)))