g10: Improve and unify key selection for -r and --locate-keys.

* g10/getkey.c (struct pubkey_cmp_cookie): New type.
(key_is_ok, uid_is_ok, subkey_is_ok): New functions.
(pubkey_cmp): Likewise.
(get_best_pubkey_byname): Likewise.
* g10/keydb.h (get_best_pubkey_byname): New prototype.
* g10/keylist.c (locate_one): Use the new function.
* g10/pkclist.c (find_and_check_key): Likewise.
* tests/openpgp/Makefile.am (XTESTS): Add new test.
(TEST_FILES): Add new files.
* tests/openpgp/key-selection.scm: New file.
* tests/openpgp/key-selection/0.asc: Likewise.
* tests/openpgp/key-selection/1.asc: Likewise.
* tests/openpgp/key-selection/2.asc: Likewise.
* tests/openpgp/key-selection/3.asc: Likewise.
* tests/openpgp/key-selection/4.asc: Likewise.
--

When a name resembling a mail address is given to either --locate-keys
or --recipient, rank the search results and use only the most relevant
key.

This also lets us query which key will be used for encryption using
--locate-keys.  However, note that --locate-keys may also return keys
incapable of encryption, though it will prefer keys that have an
encryption subkey.

GnuPG-bug-id: 2359
Signed-off-by: Justus Winter <justus@g10code.com>
This commit is contained in:
Justus Winter 2016-10-27 18:48:51 +02:00
parent 1ec07cbc20
commit ab89164be0
11 changed files with 454 additions and 3 deletions

View File

@ -1461,6 +1461,211 @@ get_pubkey_byname (ctrl_t ctrl, GETKEY_CTX * retctx, PKT_public_key * pk,
return rc;
}
/* Comparison machinery for get_best_pubkey_byname. */
/* First we have a struct to cache computed information about the key
* in question. */
struct pubkey_cmp_cookie
{
int valid; /* Is this cookie valid? */
PKT_public_key key; /* The key. */
PKT_user_id *uid; /* The matching UID packet. */
unsigned int validity; /* Computed validity of (KEY, UID). */
u32 creation_time; /* Creation time of the newest subkey
capable of encryption. */
};
/* Then we have a series of helper functions. */
static int
key_is_ok (const PKT_public_key *key)
{
return ! key->has_expired && ! key->flags.revoked
&& key->flags.valid && ! key->flags.disabled;
}
static int
uid_is_ok (const PKT_public_key *key, const PKT_user_id *uid)
{
return key_is_ok (key) && ! uid->is_revoked;
}
static int
subkey_is_ok (const PKT_public_key *sub)
{
return ! sub->flags.revoked && sub->flags.valid && ! sub->flags.disabled;
}
/* Finally this function compares a NEW key to the former candidate
* OLD. Returns < 0 if the old key is worse, > 0 if the old key is
* better, == 0 if it is a tie. */
static int
pubkey_cmp (ctrl_t ctrl, const char *name, struct pubkey_cmp_cookie *old,
struct pubkey_cmp_cookie *new, KBNODE new_keyblock)
{
KBNODE n;
new->creation_time = 0;
for (n = find_next_kbnode (new_keyblock, PKT_PUBLIC_SUBKEY);
n; n = find_next_kbnode (n, PKT_PUBLIC_SUBKEY))
{
PKT_public_key *sub = n->pkt->pkt.public_key;
if ((sub->pubkey_usage & PUBKEY_USAGE_ENC) == 0)
continue;
if (! subkey_is_ok (sub))
continue;
if (sub->timestamp > new->creation_time)
new->creation_time = sub->timestamp;
}
for (n = find_next_kbnode (new_keyblock, PKT_USER_ID);
n; n = find_next_kbnode (n, PKT_USER_ID))
{
PKT_user_id *uid = n->pkt->pkt.user_id;
char *mbox = mailbox_from_userid (uid->name);
int match = mbox ? strcasecmp (name, mbox) == 0 : 0;
xfree (mbox);
if (! match)
continue;
new->uid = uid;
new->validity =
get_validity (ctrl, &new->key, uid, NULL, 0) & TRUST_MASK;
new->valid = 1;
if (! old->valid)
return -1; /* No OLD key. */
if (! uid_is_ok (&old->key, old->uid) && uid_is_ok (&new->key, uid))
return -1; /* Validity of the NEW key is better. */
if (old->validity < new->validity)
return -1; /* Validity of the NEW key is better. */
if (old->validity == new->validity && uid_is_ok (&new->key, uid)
&& old->creation_time < new->creation_time)
return -1; /* Both keys are of the same validity, but the
NEW key is newer. */
}
/* Stick with the OLD key. */
return 1;
}
/* This function works like get_pubkey_byname, but if the name
* resembles a mail address, the results are ranked and only the best
* result is returned. */
int
get_best_pubkey_byname (ctrl_t ctrl, GETKEY_CTX *retctx, PKT_public_key *pk,
const char *name, KBNODE *ret_keyblock,
int include_unusable, int no_akl)
{
int rc;
struct getkey_ctx_s *ctx = NULL;
rc = get_pubkey_byname (ctrl, &ctx, pk, name, ret_keyblock,
NULL, include_unusable, no_akl);
if (rc)
{
if (ctx)
getkey_end (ctx);
if (retctx)
*retctx = NULL;
return rc;
}
if (is_valid_mailbox (name))
{
/* Rank results and return only the most relevant key. */
struct pubkey_cmp_cookie best = { 0 }, new;
while (getkey_next (ctx, &new.key, NULL) == 0)
{
KBNODE new_keyblock = get_pubkeyblock (pk_keyid (&new.key));
int diff = pubkey_cmp (ctrl, name, &best, &new, new_keyblock);
release_kbnode (new_keyblock);
if (diff < 0)
{
/* New key is better. */
release_public_key_parts (&best.key);
best = new;
}
else if (diff > 0)
{
/* Old key is better. */
release_public_key_parts (&new.key);
}
else
{
/* A tie. Keep the old key. */
release_public_key_parts (&new.key);
}
}
getkey_end (ctx);
ctx = NULL;
if (best.valid)
{
if (retctx || ret_keyblock)
{
ctx = xtrycalloc (1, sizeof **retctx);
if (! ctx)
rc = gpg_error_from_syserror ();
else
{
ctx->kr_handle = keydb_new ();
if (! ctx->kr_handle)
{
xfree (ctx);
*retctx = NULL;
rc = gpg_error_from_syserror ();
}
else
{
u32 *keyid = pk_keyid (&best.key);
ctx->exact = 1;
ctx->nitems = 1;
ctx->items[0].mode = KEYDB_SEARCH_MODE_LONG_KID;
ctx->items[0].u.kid[0] = keyid[0];
ctx->items[0].u.kid[1] = keyid[1];
if (ret_keyblock)
{
release_kbnode (*ret_keyblock);
*ret_keyblock = NULL;
rc = getkey_next (ctx, NULL, ret_keyblock);
}
}
}
}
if (pk)
*pk = best.key;
else
release_public_key_parts (&best.key);
}
}
if (rc && ctx)
{
getkey_end (ctx);
ctx = NULL;
}
if (retctx && ctx)
*retctx = ctx;
else
getkey_end (ctx);
return rc;
}
/* Get a public key from a file.
*

View File

@ -324,6 +324,13 @@ int get_pubkey_byname (ctrl_t ctrl,
KBNODE *ret_keyblock, KEYDB_HANDLE *ret_kdbhd,
int include_unusable, int no_akl );
/* Likewise, but only return the best match if NAME resembles a mail
* address. */
int get_best_pubkey_byname (ctrl_t ctrl,
GETKEY_CTX *retctx, PKT_public_key *pk,
const char *name, KBNODE *ret_keyblock,
int include_unusable, int no_akl);
/* Get a public key directly from file FNAME. */
gpg_error_t get_pubkey_fromfile (ctrl_t ctrl,
PKT_public_key *pk, const char *fname);

View File

@ -650,7 +650,7 @@ locate_one (ctrl_t ctrl, strlist_t names)
for (sl = names; sl; sl = sl->next)
{
rc = get_pubkey_byname (ctrl, &ctx, NULL, sl->d, &keyblock, NULL, 1, 0);
rc = get_best_pubkey_byname (ctrl, &ctx, NULL, sl->d, &keyblock, 1, 0);
if (rc)
{
if (gpg_err_code (rc) != GPG_ERR_NO_PUBKEY)

View File

@ -838,7 +838,7 @@ find_and_check_key (ctrl_t ctrl, const char *name, unsigned int use,
if (from_file)
rc = get_pubkey_fromfile (ctrl, pk, name);
else
rc = get_pubkey_byname (ctrl, NULL, pk, name, NULL, NULL, 0, 0);
rc = get_best_pubkey_byname (ctrl, NULL, pk, name, NULL, 0, 0);
if (rc)
{
int code;

View File

@ -83,6 +83,7 @@ XTESTS = \
export.scm \
ssh.scm \
quick-key-manipulation.scm \
key-selection.scm \
issue2015.scm \
issue2346.scm \
issue2417.scm \
@ -124,7 +125,12 @@ TEST_FILES = pubring.asc secring.asc plain-1o.asc plain-2o.asc plain-3o.asc \
tofu/cross-sigs/871C2247-3.gpg \
tofu/cross-sigs/871C2247-3.txt \
tofu/cross-sigs/871C2247-4.gpg \
tofu/cross-sigs/README
tofu/cross-sigs/README \
key-selection/0.asc \
key-selection/1.asc \
key-selection/2.asc \
key-selection/3.asc \
key-selection/4.asc
data_files = data-500 data-9000 data-32000 data-80000 plain-large

View File

@ -0,0 +1,82 @@
#!/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"))
;; This test assumes a fixed time of 2004-01-01.
;; Redefine gpg with a fixed time.
(define gpg `(,@gpg --faked-system-time=1072911600))
;; We have a number of keys for Mr. Acejlnu Acdipr <acdipr@example.org>.
(define mailbox "acdipr@example.org")
;; The keys are sorted, from the least relevant to the most relevant
;; key.
(define keys
'(("ED087E9D3394340738E20A244892A3CF8F65EBAC"
"no encryption-capable subkey, created: 2003-11-30, expires: 2006-11-29"
4)
("D7388651A1B7466D03B538428178E04B0BAA385B"
"encryption-capable subkey, created: 2000-12-31, expired: 2001-12-31"
0)
("DDEF1BEC66C8BAC8D69CED2AEABED840EC98B024"
"encryption-capable subkey, created: 2001-12-31, expires: 2006-12-30"
1)
("03FCFEDE014027DD897AD2F23D32670A96A9C2BF"
"encryption-capable subkey, created: 2002-12-31, expires: 2005-12-30"
2)
("B95BD6175CB6339244355BA160B8117E6119CED6"
"encryption-capable subkeys, last created: 2003-05-31, expires: 2005-05-30"
3)))
;; Accessors for the elements of KEYS.
(define :fpr car)
(define :comment cadr)
(define :number caddr)
(define (:filename key)
(in-srcdir "key-selection"
(string-append (number->string (:number key)) ".asc")))
(define (delete-keys which)
(call-check `(,@gpg --delete-keys ,@(map :fpr which))))
(define (import-keys which)
(call-check `(,@gpg --import ,@(map :filename which))))
(for-each-p'
"Checking key selection"
(lambda (set)
(import-keys set)
(let ((fpr (list-ref (assoc "fpr"
(gpg-with-colons `(--locate-key ,mailbox)))
9))
(expected (:fpr (last set))))
(unless (equal? fpr expected)
(display "Given keys ")
(apply echo (map :fpr set))
(echo "This is what --locate-key says:")
(display (call-popen `(,@gpg --locate-key ,mailbox) ""))
(echo "This is the key we expected:")
(display (call-popen `(,@gpg --list-keys ,expected) ""))
(error "Expected" expected "but got" fpr)))
(delete-keys set))
(lambda (set)
(length set))
(filter (lambda (x) (not (null? x))) (powerset keys)))

View File

@ -0,0 +1,30 @@
-----BEGIN PGP PUBLIC KEY BLOCK-----
mQENBDpPvC8BCACqDbU+2znCURAocNMmcwCSYVl5l4Zbx6jcy9ON7y12Ai7CRSbX
8Nb8kggit02pNFtb1l2NKad7DqR1f/WPqkQjZ6rvFHKEOsupqrUhpQ6dU3H94wuO
g4M2PGsaxKAcw24qIoKkTotecLgUFMhduIq7u8kTnalTOW1o/18moVuoVNkDdO4Y
I7n/dloVNv5Xkm5bS4VBdvUzJ9gvbqkynud/L6pSFeng0vVJQMN3tVbApcNzhLBs
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IDxhY2RpcHJAZXhhbXBsZS5vcmc+iQFUBBMBCAA+FiEE1ziGUaG3Rm0DtThCgXjg
SwuqOFsFAjpPvC8CGwMFCQHhM4AFCwkIBwIGFQgJCgsCBBYCAwECHgECF4AACgkQ
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lkEM4PC33216XMTqUG1sAWw40aDtKaiyp5J8zqLKXXjCnZsTWdj4uxB7E5WPjaEF
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=nyjX
-----END PGP PUBLIC KEY BLOCK-----

View File

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-----END PGP PUBLIC KEY BLOCK-----

View File

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