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64a1e86fc0
* g10/parse-packet.c (parse_signature): Allow for v5 signatures. * g10/sig-check.c (check_signature_end_simple): Support the 64bit v5 byte count. * g10/sign.c (hash_sigversion_to_magic): Ditto. (write_signature_packets): Request v5 sig for v5 keys. Remove useless condition. (make_keysig_packet): Request v5 sig for v5 keys. Signed-off-by: Werner Koch <wk@gnupg.org>
1205 lines
39 KiB
C
1205 lines
39 KiB
C
/* sig-check.c - Check a signature
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* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003,
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* 2004, 2006 Free Software Foundation, Inc.
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* Copyright (C) 2015, 2016 g10 Code GmbH
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <https://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "gpg.h"
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#include "../common/util.h"
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#include "packet.h"
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#include "keydb.h"
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#include "main.h"
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#include "../common/status.h"
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#include "../common/i18n.h"
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#include "options.h"
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#include "pkglue.h"
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#include "../common/compliance.h"
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static int check_signature_end (PKT_public_key *pk, PKT_signature *sig,
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gcry_md_hd_t digest,
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int *r_expired, int *r_revoked,
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PKT_public_key *ret_pk);
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static int check_signature_end_simple (PKT_public_key *pk, PKT_signature *sig,
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gcry_md_hd_t digest);
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/* Statistics for signature verification. */
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struct
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{
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unsigned int total; /* Total number of verifications. */
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unsigned int cached; /* Number of seen cache entries. */
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unsigned int goodsig;/* Number of good verifications from the cache. */
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unsigned int badsig; /* Number of bad verifications from the cache. */
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} cache_stats;
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/* Dump verification stats. */
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void
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sig_check_dump_stats (void)
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{
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log_info ("sig_cache: total=%u cached=%u good=%u bad=%u\n",
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cache_stats.total, cache_stats.cached,
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cache_stats.goodsig, cache_stats.badsig);
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}
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/* Check a signature. This is shorthand for check_signature2 with
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the unnamed arguments passed as NULL. */
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int
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check_signature (ctrl_t ctrl, PKT_signature *sig, gcry_md_hd_t digest)
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{
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return check_signature2 (ctrl, sig, digest, NULL, NULL, NULL, NULL);
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}
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/* Check a signature.
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*
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* Looks up the public key that created the signature (SIG->KEYID)
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* from the key db. Makes sure that the signature is valid (it was
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* not created prior to the key, the public key was created in the
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* past, and the signature does not include any unsupported critical
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* features), finishes computing the hash of the signature data, and
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* checks that the signature verifies the digest. If the key that
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* generated the signature is a subkey, this function also verifies
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* that there is a valid backsig from the subkey to the primary key.
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* Finally, if status fd is enabled and the signature class is 0x00 or
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* 0x01, then a STATUS_SIG_ID is emitted on the status fd.
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*
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* SIG is the signature to check.
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*
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* DIGEST contains a valid hash context that already includes the
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* signed data. This function adds the relevant meta-data from the
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* signature packet to compute the final hash. (See Section 5.2 of
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* RFC 4880: "The concatenation of the data being signed and the
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* signature data from the version number through the hashed subpacket
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* data (inclusive) is hashed.")
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*
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* If R_EXPIREDATE is not NULL, R_EXPIREDATE is set to the key's
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* expiry.
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*
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* If R_EXPIRED is not NULL, *R_EXPIRED is set to 1 if PK has expired
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* (0 otherwise). Note: PK being expired does not cause this function
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* to fail.
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*
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* If R_REVOKED is not NULL, *R_REVOKED is set to 1 if PK has been
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* revoked (0 otherwise). Note: PK being revoked does not cause this
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* function to fail.
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*
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* If R_PK is not NULL, the public key is stored at that address if it
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* was found; other wise NULL is stored.
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*
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* Returns 0 on success. An error code otherwise. */
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gpg_error_t
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check_signature2 (ctrl_t ctrl,
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PKT_signature *sig, gcry_md_hd_t digest, u32 *r_expiredate,
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int *r_expired, int *r_revoked, PKT_public_key **r_pk)
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{
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int rc=0;
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PKT_public_key *pk;
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if (r_expiredate)
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*r_expiredate = 0;
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if (r_expired)
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*r_expired = 0;
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if (r_revoked)
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*r_revoked = 0;
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if (r_pk)
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*r_pk = NULL;
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pk = xtrycalloc (1, sizeof *pk);
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if (!pk)
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return gpg_error_from_syserror ();
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if ((rc=openpgp_md_test_algo(sig->digest_algo)))
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{
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/* We don't have this digest. */
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}
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else if (!gnupg_digest_is_allowed (opt.compliance, 0, sig->digest_algo))
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{
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/* Compliance failure. */
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log_info (_("digest algorithm '%s' may not be used in %s mode\n"),
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gcry_md_algo_name (sig->digest_algo),
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gnupg_compliance_option_string (opt.compliance));
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rc = gpg_error (GPG_ERR_DIGEST_ALGO);
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}
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else if ((rc=openpgp_pk_test_algo(sig->pubkey_algo)))
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{
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/* We don't have this pubkey algo. */
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}
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else if (!gcry_md_is_enabled (digest,sig->digest_algo))
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{
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/* Sanity check that the md has a context for the hash that the
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* sig is expecting. This can happen if a onepass sig header
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* does not match the actual sig, and also if the clearsign
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* "Hash:" header is missing or does not match the actual sig. */
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log_info(_("WARNING: signature digest conflict in message\n"));
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rc = gpg_error (GPG_ERR_GENERAL);
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}
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else if (get_pubkey_for_sig (ctrl, pk, sig))
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rc = gpg_error (GPG_ERR_NO_PUBKEY);
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else if (!gnupg_pk_is_allowed (opt.compliance, PK_USE_VERIFICATION,
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pk->pubkey_algo, pk->pkey,
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nbits_from_pk (pk),
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NULL))
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{
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/* Compliance failure. */
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log_error (_("key %s may not be used for signing in %s mode\n"),
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keystr_from_pk (pk),
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gnupg_compliance_option_string (opt.compliance));
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rc = gpg_error (GPG_ERR_PUBKEY_ALGO);
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}
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else if (!pk->flags.valid)
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{
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/* You cannot have a good sig from an invalid key. */
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rc = gpg_error (GPG_ERR_BAD_PUBKEY);
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}
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else
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{
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if (r_expiredate)
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*r_expiredate = pk->expiredate;
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rc = check_signature_end (pk, sig, digest, r_expired, r_revoked, NULL);
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/* Check the backsig. This is a back signature (0x19) from
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* the subkey on the primary key. The idea here is that it
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* should not be possible for someone to "steal" subkeys and
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* claim them as their own. The attacker couldn't actually
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* use the subkey, but they could try and claim ownership of
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* any signatures issued by it. */
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if (!rc && !pk->flags.primary && pk->flags.backsig < 2)
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{
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if (!pk->flags.backsig)
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{
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log_info (_("WARNING: signing subkey %s is not"
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" cross-certified\n"),keystr_from_pk(pk));
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log_info (_("please see %s for more information\n"),
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"https://gnupg.org/faq/subkey-cross-certify.html");
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/* The default option --require-cross-certification
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* makes this warning an error. */
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if (opt.flags.require_cross_cert)
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rc = gpg_error (GPG_ERR_GENERAL);
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}
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else if(pk->flags.backsig == 1)
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{
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log_info (_("WARNING: signing subkey %s has an invalid"
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" cross-certification\n"), keystr_from_pk(pk));
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rc = gpg_error (GPG_ERR_GENERAL);
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}
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}
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}
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if( !rc && sig->sig_class < 2 && is_status_enabled() ) {
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/* This signature id works best with DLP algorithms because
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* they use a random parameter for every signature. Instead of
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* this sig-id we could have also used the hash of the document
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* and the timestamp, but the drawback of this is, that it is
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* not possible to sign more than one identical document within
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* one second. Some remote batch processing applications might
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* like this feature here.
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*
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* Note that before 2.0.10, we used RIPE-MD160 for the hash
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* and accidentally didn't include the timestamp and algorithm
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* information in the hash. Given that this feature is not
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* commonly used and that a replay attacks detection should
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* not solely be based on this feature (because it does not
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* work with RSA), we take the freedom and switch to SHA-1
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* with 2.0.10 to take advantage of hardware supported SHA-1
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* implementations. We also include the missing information
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* in the hash. Note also the SIG_ID as computed by gpg 1.x
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* and gpg 2.x didn't matched either because 2.x used to print
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* MPIs not in PGP format. */
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u32 a = sig->timestamp;
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int nsig = pubkey_get_nsig( sig->pubkey_algo );
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unsigned char *p, *buffer;
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size_t n, nbytes;
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int i;
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char hashbuf[20]; /* We use SHA-1 here. */
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nbytes = 6;
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for (i=0; i < nsig; i++ )
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{
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if (gcry_mpi_print (GCRYMPI_FMT_USG, NULL, 0, &n, sig->data[i]))
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BUG();
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nbytes += n;
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}
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/* Make buffer large enough to be later used as output buffer. */
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if (nbytes < 100)
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nbytes = 100;
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nbytes += 10; /* Safety margin. */
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/* Fill and hash buffer. */
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buffer = p = xmalloc (nbytes);
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*p++ = sig->pubkey_algo;
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*p++ = sig->digest_algo;
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*p++ = (a >> 24) & 0xff;
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*p++ = (a >> 16) & 0xff;
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*p++ = (a >> 8) & 0xff;
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*p++ = a & 0xff;
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nbytes -= 6;
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for (i=0; i < nsig; i++ )
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{
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if (gcry_mpi_print (GCRYMPI_FMT_PGP, p, nbytes, &n, sig->data[i]))
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BUG();
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p += n;
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nbytes -= n;
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}
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gcry_md_hash_buffer (GCRY_MD_SHA1, hashbuf, buffer, p-buffer);
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p = make_radix64_string (hashbuf, 20);
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sprintf (buffer, "%s %s %lu",
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p, strtimestamp (sig->timestamp), (ulong)sig->timestamp);
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xfree (p);
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write_status_text (STATUS_SIG_ID, buffer);
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xfree (buffer);
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}
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if (r_pk)
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*r_pk = pk;
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else
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{
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release_public_key_parts (pk);
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xfree (pk);
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}
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return rc;
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}
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/* The signature SIG was generated with the public key PK. Check
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* whether the signature is valid in the following sense:
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*
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* - Make sure the public key was created before the signature was
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* generated.
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*
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* - Make sure the public key was created in the past
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*
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* - Check whether PK has expired (set *R_EXPIRED to 1 if so and 0
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* otherwise)
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*
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* - Check whether PK has been revoked (set *R_REVOKED to 1 if so
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* and 0 otherwise).
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*
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* If either of the first two tests fail, returns an error code.
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* Otherwise returns 0. (Thus, this function doesn't fail if the
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* public key is expired or revoked.) */
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static int
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check_signature_metadata_validity (PKT_public_key *pk, PKT_signature *sig,
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int *r_expired, int *r_revoked)
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{
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u32 cur_time;
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if (r_expired)
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*r_expired = 0;
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if (r_revoked)
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*r_revoked = 0;
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if (pk->timestamp > sig->timestamp )
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{
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ulong d = pk->timestamp - sig->timestamp;
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if ( d < 86400 )
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{
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log_info (ngettext
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("public key %s is %lu second newer than the signature\n",
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"public key %s is %lu seconds newer than the signature\n",
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d), keystr_from_pk (pk), d);
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}
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else
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{
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d /= 86400;
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log_info (ngettext
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("public key %s is %lu day newer than the signature\n",
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"public key %s is %lu days newer than the signature\n",
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d), keystr_from_pk (pk), d);
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}
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if (!opt.ignore_time_conflict)
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return GPG_ERR_TIME_CONFLICT; /* pubkey newer than signature. */
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}
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cur_time = make_timestamp ();
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if (pk->timestamp > cur_time)
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{
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ulong d = pk->timestamp - cur_time;
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if (d < 86400)
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{
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log_info (ngettext("key %s was created %lu second"
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" in the future (time warp or clock problem)\n",
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"key %s was created %lu seconds"
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" in the future (time warp or clock problem)\n",
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d), keystr_from_pk (pk), d);
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}
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else
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{
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d /= 86400;
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log_info (ngettext("key %s was created %lu day"
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" in the future (time warp or clock problem)\n",
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"key %s was created %lu days"
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" in the future (time warp or clock problem)\n",
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d), keystr_from_pk (pk), d);
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}
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if (!opt.ignore_time_conflict)
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return GPG_ERR_TIME_CONFLICT;
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}
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/* Check whether the key has expired. We check the has_expired
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* flag which is set after a full evaluation of the key (getkey.c)
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* as well as a simple compare to the current time in case the
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* merge has for whatever reasons not been done. */
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if (pk->has_expired || (pk->expiredate && pk->expiredate < cur_time))
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{
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char buf[11];
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if (opt.verbose)
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log_info (_("Note: signature key %s expired %s\n"),
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keystr_from_pk(pk), asctimestamp( pk->expiredate ) );
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snprintf (buf, sizeof buf, "%lu",(ulong)pk->expiredate);
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write_status_text (STATUS_KEYEXPIRED, buf);
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if (r_expired)
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*r_expired = 1;
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}
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if (pk->flags.revoked)
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{
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if (opt.verbose)
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log_info (_("Note: signature key %s has been revoked\n"),
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keystr_from_pk(pk));
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if (r_revoked)
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*r_revoked=1;
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}
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return 0;
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}
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/* Finish generating a signature and check it. Concretely: make sure
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* that the signature is valid (it was not created prior to the key,
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* the public key was created in the past, and the signature does not
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* include any unsupported critical features), finish computing the
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* digest by adding the relevant data from the signature packet, and
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* check that the signature verifies the digest.
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*
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* DIGEST contains a hash context, which has already hashed the signed
|
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* data. This function adds the relevant meta-data from the signature
|
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* packet to compute the final hash. (See Section 5.2 of RFC 4880:
|
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* "The concatenation of the data being signed and the signature data
|
|
* from the version number through the hashed subpacket data
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* (inclusive) is hashed.")
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*
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* SIG is the signature to check.
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*
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* PK is the public key used to generate the signature.
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*
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* If R_EXPIRED is not NULL, *R_EXPIRED is set to 1 if PK has expired
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* (0 otherwise). Note: PK being expired does not cause this function
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* to fail.
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*
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* If R_REVOKED is not NULL, *R_REVOKED is set to 1 if PK has been
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* revoked (0 otherwise). Note: PK being revoked does not cause this
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* function to fail.
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*
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* If RET_PK is not NULL, PK is copied into RET_PK on success.
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*
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* Returns 0 on success. An error code other. */
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static int
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check_signature_end (PKT_public_key *pk, PKT_signature *sig,
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gcry_md_hd_t digest,
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int *r_expired, int *r_revoked, PKT_public_key *ret_pk)
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{
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int rc = 0;
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if ((rc = check_signature_metadata_validity (pk, sig,
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r_expired, r_revoked)))
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return rc;
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if ((rc = check_signature_end_simple (pk, sig, digest)))
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return rc;
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if (!rc && ret_pk)
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copy_public_key(ret_pk,pk);
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return rc;
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}
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/* This function is similar to check_signature_end, but it only checks
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* whether the signature was generated by PK. It does not check
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* expiration, revocation, etc. */
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static int
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check_signature_end_simple (PKT_public_key *pk, PKT_signature *sig,
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gcry_md_hd_t digest)
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{
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gcry_mpi_t result = NULL;
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int rc = 0;
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const struct weakhash *weak;
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if (!opt.flags.allow_weak_digest_algos)
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{
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for (weak = opt.weak_digests; weak; weak = weak->next)
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if (sig->digest_algo == weak->algo)
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{
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print_digest_rejected_note(sig->digest_algo);
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return GPG_ERR_DIGEST_ALGO;
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}
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}
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/* For key signatures check that the key has a cert usage. We may
|
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* do this only for subkeys because the primary may always issue key
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* signature. The latter may not be reflected in the pubkey_usage
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* field because we need to check the key signatures to extract the
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* key usage. */
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if (!pk->flags.primary
|
|
&& IS_CERT (sig) && !(pk->pubkey_usage & PUBKEY_USAGE_CERT))
|
|
{
|
|
rc = gpg_error (GPG_ERR_WRONG_KEY_USAGE);
|
|
if (!opt.quiet)
|
|
log_info (_("bad key signature from key %s: %s (0x%02x, 0x%x)\n"),
|
|
keystr_from_pk (pk), gpg_strerror (rc),
|
|
sig->sig_class, pk->pubkey_usage);
|
|
return rc;
|
|
}
|
|
|
|
/* For data signatures check that the key has sign usage. */
|
|
if (!IS_BACK_SIG (sig) && IS_SIG (sig)
|
|
&& !(pk->pubkey_usage & PUBKEY_USAGE_SIG))
|
|
{
|
|
rc = gpg_error (GPG_ERR_WRONG_KEY_USAGE);
|
|
if (!opt.quiet)
|
|
log_info (_("bad data signature from key %s: %s (0x%02x, 0x%x)\n"),
|
|
keystr_from_pk (pk), gpg_strerror (rc),
|
|
sig->sig_class, pk->pubkey_usage);
|
|
return rc;
|
|
}
|
|
|
|
/* Make sure the digest algo is enabled (in case of a detached
|
|
* signature). */
|
|
gcry_md_enable (digest, sig->digest_algo);
|
|
|
|
/* Complete the digest. */
|
|
if (sig->version >= 4)
|
|
gcry_md_putc (digest, sig->version);
|
|
|
|
gcry_md_putc( digest, sig->sig_class );
|
|
if (sig->version < 4)
|
|
{
|
|
u32 a = sig->timestamp;
|
|
gcry_md_putc (digest, ((a >> 24) & 0xff));
|
|
gcry_md_putc (digest, ((a >> 16) & 0xff));
|
|
gcry_md_putc (digest, ((a >> 8) & 0xff));
|
|
gcry_md_putc (digest, ( a & 0xff));
|
|
}
|
|
else
|
|
{
|
|
byte buf[10];
|
|
int i;
|
|
size_t n;
|
|
gcry_md_putc (digest, sig->pubkey_algo);
|
|
gcry_md_putc (digest, sig->digest_algo);
|
|
if (sig->hashed)
|
|
{
|
|
n = sig->hashed->len;
|
|
gcry_md_putc (digest, (n >> 8) );
|
|
gcry_md_putc (digest, n );
|
|
gcry_md_write (digest, sig->hashed->data, n);
|
|
n += 6;
|
|
}
|
|
else
|
|
{
|
|
/* Two octets for the (empty) length of the hashed
|
|
* section. */
|
|
gcry_md_putc (digest, 0);
|
|
gcry_md_putc (digest, 0);
|
|
n = 6;
|
|
}
|
|
/* add some magic per Section 5.2.4 of RFC 4880. */
|
|
i = 0;
|
|
buf[i++] = sig->version;
|
|
buf[i++] = 0xff;
|
|
if (sig->version >= 5)
|
|
{
|
|
buf[i++] = 0;
|
|
buf[i++] = 0;
|
|
buf[i++] = 0;
|
|
buf[i++] = 0;
|
|
}
|
|
buf[i++] = n >> 24;
|
|
buf[i++] = n >> 16;
|
|
buf[i++] = n >> 8;
|
|
buf[i++] = n;
|
|
gcry_md_write (digest, buf, i);
|
|
}
|
|
gcry_md_final( digest );
|
|
|
|
/* Convert the digest to an MPI. */
|
|
result = encode_md_value (pk, digest, sig->digest_algo );
|
|
if (!result)
|
|
return GPG_ERR_GENERAL;
|
|
|
|
/* Verify the signature. */
|
|
if (DBG_CLOCK && sig->sig_class <= 0x01)
|
|
log_clock ("enter pk_verify");
|
|
rc = pk_verify( pk->pubkey_algo, result, sig->data, pk->pkey );
|
|
if (DBG_CLOCK && sig->sig_class <= 0x01)
|
|
log_clock ("leave pk_verify");
|
|
gcry_mpi_release (result);
|
|
|
|
if (!rc && sig->flags.unknown_critical)
|
|
{
|
|
log_info(_("assuming bad signature from key %s"
|
|
" due to an unknown critical bit\n"),keystr_from_pk(pk));
|
|
rc = GPG_ERR_BAD_SIGNATURE;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
|
|
/* Add a uid node to a hash context. See section 5.2.4, paragraph 4
|
|
* of RFC 4880. */
|
|
static void
|
|
hash_uid_packet (PKT_user_id *uid, gcry_md_hd_t md, PKT_signature *sig )
|
|
{
|
|
if (uid->attrib_data)
|
|
{
|
|
if (sig->version >= 4)
|
|
{
|
|
byte buf[5];
|
|
buf[0] = 0xd1; /* packet of type 17 */
|
|
buf[1] = uid->attrib_len >> 24; /* always use 4 length bytes */
|
|
buf[2] = uid->attrib_len >> 16;
|
|
buf[3] = uid->attrib_len >> 8;
|
|
buf[4] = uid->attrib_len;
|
|
gcry_md_write( md, buf, 5 );
|
|
}
|
|
gcry_md_write( md, uid->attrib_data, uid->attrib_len );
|
|
}
|
|
else
|
|
{
|
|
if (sig->version >= 4)
|
|
{
|
|
byte buf[5];
|
|
buf[0] = 0xb4; /* indicates a userid packet */
|
|
buf[1] = uid->len >> 24; /* always use 4 length bytes */
|
|
buf[2] = uid->len >> 16;
|
|
buf[3] = uid->len >> 8;
|
|
buf[4] = uid->len;
|
|
gcry_md_write( md, buf, 5 );
|
|
}
|
|
gcry_md_write( md, uid->name, uid->len );
|
|
}
|
|
}
|
|
|
|
static void
|
|
cache_sig_result ( PKT_signature *sig, int result )
|
|
{
|
|
if (!result)
|
|
{
|
|
sig->flags.checked = 1;
|
|
sig->flags.valid = 1;
|
|
}
|
|
else if (gpg_err_code (result) == GPG_ERR_BAD_SIGNATURE)
|
|
{
|
|
sig->flags.checked = 1;
|
|
sig->flags.valid = 0;
|
|
}
|
|
else
|
|
{
|
|
sig->flags.checked = 0;
|
|
sig->flags.valid = 0;
|
|
}
|
|
}
|
|
|
|
|
|
/* SIG is a key revocation signature. Check if this signature was
|
|
* generated by any of the public key PK's designated revokers.
|
|
*
|
|
* PK is the public key that SIG allegedly revokes.
|
|
*
|
|
* SIG is the revocation signature to check.
|
|
*
|
|
* This function avoids infinite recursion, which can happen if two
|
|
* keys are designed revokers for each other and they revoke each
|
|
* other. This is done by observing that if a key A is revoked by key
|
|
* B we still consider the revocation to be valid even if B is
|
|
* revoked. Thus, we don't need to determine whether B is revoked to
|
|
* determine whether A has been revoked by B, we just need to check
|
|
* the signature.
|
|
*
|
|
* Returns 0 if sig is valid (i.e. pk is revoked), non-0 if not
|
|
* revoked. We are careful to make sure that GPG_ERR_NO_PUBKEY is
|
|
* only returned when a revocation signature is from a valid
|
|
* revocation key designated in a revkey subpacket, but the revocation
|
|
* key itself isn't present.
|
|
*
|
|
* XXX: This code will need to be modified if gpg ever becomes
|
|
* multi-threaded. Note that this guarantees that a designated
|
|
* revocation sig will never be considered valid unless it is actually
|
|
* valid, as well as being issued by a revocation key in a valid
|
|
* direct signature. Note also that this is written so that a revoked
|
|
* revoker can still issue revocations: i.e. If A revokes B, but A is
|
|
* revoked, B is still revoked. I'm not completely convinced this is
|
|
* the proper behavior, but it matches how PGP does it. -dms */
|
|
int
|
|
check_revocation_keys (ctrl_t ctrl, PKT_public_key *pk, PKT_signature *sig)
|
|
{
|
|
static int busy=0;
|
|
int i;
|
|
int rc = GPG_ERR_GENERAL;
|
|
|
|
log_assert (IS_KEY_REV(sig));
|
|
log_assert ((sig->keyid[0]!=pk->keyid[0]) || (sig->keyid[0]!=pk->keyid[1]));
|
|
|
|
/* Avoid infinite recursion. Consider the following:
|
|
*
|
|
* - We want to check if A is revoked.
|
|
*
|
|
* - C is a designated revoker for B and has revoked B.
|
|
*
|
|
* - B is a designated revoker for A and has revoked A.
|
|
*
|
|
* When checking if A is revoked (in merge_selfsigs_main), we
|
|
* observe that A has a designed revoker. As such, we call this
|
|
* function. This function sees that there is a valid revocation
|
|
* signature, which is signed by B. It then calls check_signature()
|
|
* to verify that the signature is good. To check the sig, we need
|
|
* to lookup B. Looking up B means calling merge_selfsigs_main,
|
|
* which checks whether B is revoked, which calls this function to
|
|
* see if B was revoked by some key.
|
|
*
|
|
* In this case, the added level of indirection doesn't hurt. It
|
|
* just means a bit more work. However, if C == A, then we'd end up
|
|
* in a loop. But, it doesn't make sense to look up C anyways: even
|
|
* if B is revoked, we conservatively consider a valid revocation
|
|
* signed by B to revoke A. Since this is the only place where this
|
|
* type of recursion can occur, we simply cause this function to
|
|
* fail if it is entered recursively. */
|
|
if (busy)
|
|
{
|
|
/* Return an error (i.e. not revoked), but mark the pk as
|
|
uncacheable as we don't really know its revocation status
|
|
until it is checked directly. */
|
|
pk->flags.dont_cache = 1;
|
|
return rc;
|
|
}
|
|
|
|
busy=1;
|
|
|
|
/* es_printf("looking at %08lX with a sig from %08lX\n",(ulong)pk->keyid[1],
|
|
(ulong)sig->keyid[1]); */
|
|
|
|
/* is the issuer of the sig one of our revokers? */
|
|
if( !pk->revkey && pk->numrevkeys )
|
|
BUG();
|
|
else
|
|
for(i=0;i<pk->numrevkeys;i++)
|
|
{
|
|
/* The revoker's keyid. */
|
|
u32 keyid[2];
|
|
|
|
keyid_from_fingerprint (ctrl, pk->revkey[i].fpr,
|
|
MAX_FINGERPRINT_LEN, keyid);
|
|
|
|
if(keyid[0]==sig->keyid[0] && keyid[1]==sig->keyid[1])
|
|
/* The signature was generated by a designated revoker.
|
|
Verify the signature. */
|
|
{
|
|
gcry_md_hd_t md;
|
|
|
|
if (gcry_md_open (&md, sig->digest_algo, 0))
|
|
BUG ();
|
|
hash_public_key(md,pk);
|
|
/* Note: check_signature only checks that the signature
|
|
is good. It does not fail if the key is revoked. */
|
|
rc = check_signature (ctrl, sig, md);
|
|
cache_sig_result(sig,rc);
|
|
gcry_md_close (md);
|
|
break;
|
|
}
|
|
}
|
|
|
|
busy=0;
|
|
|
|
return rc;
|
|
}
|
|
|
|
/* Check that the backsig BACKSIG from the subkey SUB_PK to its
|
|
* primary key MAIN_PK is valid.
|
|
*
|
|
* Backsigs (0x19) have the same format as binding sigs (0x18), but
|
|
* this function is simpler than check_key_signature in a few ways.
|
|
* For example, there is no support for expiring backsigs since it is
|
|
* questionable what such a thing actually means. Note also that the
|
|
* sig cache check here, unlike other sig caches in GnuPG, is not
|
|
* persistent. */
|
|
int
|
|
check_backsig (PKT_public_key *main_pk,PKT_public_key *sub_pk,
|
|
PKT_signature *backsig)
|
|
{
|
|
gcry_md_hd_t md;
|
|
int rc;
|
|
|
|
/* Always check whether the algorithm is available. Although
|
|
gcry_md_open would throw an error, some libgcrypt versions will
|
|
print a debug message in that case too. */
|
|
if ((rc=openpgp_md_test_algo (backsig->digest_algo)))
|
|
return rc;
|
|
|
|
if(!opt.no_sig_cache && backsig->flags.checked)
|
|
return backsig->flags.valid? 0 : gpg_error (GPG_ERR_BAD_SIGNATURE);
|
|
|
|
rc = gcry_md_open (&md, backsig->digest_algo,0);
|
|
if (!rc)
|
|
{
|
|
hash_public_key(md,main_pk);
|
|
hash_public_key(md,sub_pk);
|
|
rc = check_signature_end (sub_pk, backsig, md, NULL, NULL, NULL);
|
|
cache_sig_result(backsig,rc);
|
|
gcry_md_close(md);
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
|
|
/* Check that a signature over a key is valid. This is a
|
|
* specialization of check_key_signature2 with the unnamed parameters
|
|
* passed as NULL. See the documentation for that function for more
|
|
* details. */
|
|
int
|
|
check_key_signature (ctrl_t ctrl, kbnode_t root, kbnode_t node,
|
|
int *is_selfsig)
|
|
{
|
|
return check_key_signature2 (ctrl, root, node, NULL, NULL,
|
|
is_selfsig, NULL, NULL);
|
|
}
|
|
|
|
|
|
/* Returns whether SIGNER generated the signature SIG over the packet
|
|
* PACKET, which is a key, subkey or uid, and comes from the key block
|
|
* KB. (KB is PACKET's corresponding keyblock; we don't assume that
|
|
* SIG has been added to the keyblock.)
|
|
*
|
|
* If SIGNER is set, then checks whether SIGNER generated the
|
|
* signature. Otherwise, uses SIG->KEYID to find the alleged signer.
|
|
* This parameter can be used to effectively override the alleged
|
|
* signer that is stored in SIG.
|
|
*
|
|
* KB may be NULL if SIGNER is set.
|
|
*
|
|
* Unlike check_key_signature, this function ignores any cached
|
|
* results! That is, it does not consider SIG->FLAGS.CHECKED and
|
|
* SIG->FLAGS.VALID nor does it set them.
|
|
*
|
|
* This doesn't check the signature's semantic mean. Concretely, it
|
|
* doesn't check whether a non-self signed revocation signature was
|
|
* created by a designated revoker. In fact, it doesn't return an
|
|
* error for a binding generated by a completely different key!
|
|
*
|
|
* Returns 0 if the signature is valid. Returns GPG_ERR_SIG_CLASS if
|
|
* this signature can't be over PACKET. Returns GPG_ERR_NOT_FOUND if
|
|
* the key that generated the signature (according to SIG) could not
|
|
* be found. Returns GPG_ERR_BAD_SIGNATURE if the signature is bad.
|
|
* Other errors codes may be returned if something else goes wrong.
|
|
*
|
|
* IF IS_SELFSIG is not NULL, sets *IS_SELFSIG to 1 if this is a
|
|
* self-signature (by the key's primary key) or 0 if not.
|
|
*
|
|
* If RET_PK is not NULL, returns a copy of the public key that
|
|
* generated the signature (i.e., the signer) on success. This must
|
|
* be released by the caller using release_public_key_parts (). */
|
|
gpg_error_t
|
|
check_signature_over_key_or_uid (ctrl_t ctrl, PKT_public_key *signer,
|
|
PKT_signature *sig, KBNODE kb, PACKET *packet,
|
|
int *is_selfsig, PKT_public_key *ret_pk)
|
|
{
|
|
int rc;
|
|
PKT_public_key *pripk = kb->pkt->pkt.public_key;
|
|
gcry_md_hd_t md;
|
|
int signer_alloced = 0;
|
|
|
|
rc = openpgp_pk_test_algo (sig->pubkey_algo);
|
|
if (rc)
|
|
return rc;
|
|
rc = openpgp_md_test_algo (sig->digest_algo);
|
|
if (rc)
|
|
return rc;
|
|
|
|
/* A signature's class indicates the type of packet that it
|
|
signs. */
|
|
if (IS_BACK_SIG (sig) || IS_KEY_SIG (sig) || IS_KEY_REV (sig))
|
|
{
|
|
/* Key revocations can only be over primary keys. */
|
|
if (packet->pkttype != PKT_PUBLIC_KEY)
|
|
return gpg_error (GPG_ERR_SIG_CLASS);
|
|
}
|
|
else if (IS_SUBKEY_SIG (sig) || IS_SUBKEY_REV (sig))
|
|
{
|
|
if (packet->pkttype != PKT_PUBLIC_SUBKEY)
|
|
return gpg_error (GPG_ERR_SIG_CLASS);
|
|
}
|
|
else if (IS_UID_SIG (sig) || IS_UID_REV (sig))
|
|
{
|
|
if (packet->pkttype != PKT_USER_ID)
|
|
return gpg_error (GPG_ERR_SIG_CLASS);
|
|
}
|
|
else
|
|
return gpg_error (GPG_ERR_SIG_CLASS);
|
|
|
|
/* PACKET is the right type for SIG. */
|
|
|
|
if (signer)
|
|
{
|
|
if (is_selfsig)
|
|
{
|
|
if (signer->keyid[0] == pripk->keyid[0]
|
|
&& signer->keyid[1] == pripk->keyid[1])
|
|
*is_selfsig = 1;
|
|
else
|
|
*is_selfsig = 0;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* Get the signer. If possible, avoid a look up. */
|
|
if (sig->keyid[0] == pripk->keyid[0]
|
|
&& sig->keyid[1] == pripk->keyid[1])
|
|
{
|
|
/* Issued by the primary key. */
|
|
signer = pripk;
|
|
if (is_selfsig)
|
|
*is_selfsig = 1;
|
|
}
|
|
else
|
|
{
|
|
/* See if one of the subkeys was the signer (although this
|
|
* is extremely unlikely). */
|
|
kbnode_t ctx = NULL;
|
|
kbnode_t n;
|
|
|
|
while ((n = walk_kbnode (kb, &ctx, 0)))
|
|
{
|
|
PKT_public_key *subk;
|
|
|
|
if (n->pkt->pkttype != PKT_PUBLIC_SUBKEY)
|
|
continue;
|
|
|
|
subk = n->pkt->pkt.public_key;
|
|
if (sig->keyid[0] == subk->keyid[0]
|
|
&& sig->keyid[1] == subk->keyid[1])
|
|
{
|
|
/* Issued by a subkey. */
|
|
signer = subk;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (! signer)
|
|
{
|
|
/* Signer by some other key. */
|
|
if (is_selfsig)
|
|
*is_selfsig = 0;
|
|
if (ret_pk)
|
|
{
|
|
signer = ret_pk;
|
|
/* FIXME: Using memset here is probematic because it
|
|
* assumes that there are no allocated fields in
|
|
* SIGNER. */
|
|
memset (signer, 0, sizeof (*signer));
|
|
signer_alloced = 1;
|
|
}
|
|
else
|
|
{
|
|
signer = xmalloc_clear (sizeof (*signer));
|
|
signer_alloced = 2;
|
|
}
|
|
|
|
if (IS_CERT (sig))
|
|
signer->req_usage = PUBKEY_USAGE_CERT;
|
|
|
|
rc = get_pubkey_for_sig (ctrl, signer, sig);
|
|
if (rc)
|
|
{
|
|
xfree (signer);
|
|
signer = NULL;
|
|
signer_alloced = 0;
|
|
goto leave;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* We checked above that we supported this algo, so an error here is
|
|
* a bug. */
|
|
if (gcry_md_open (&md, sig->digest_algo, 0))
|
|
BUG ();
|
|
|
|
/* Hash the relevant data. */
|
|
|
|
if (IS_KEY_SIG (sig) || IS_KEY_REV (sig))
|
|
{
|
|
log_assert (packet->pkttype == PKT_PUBLIC_KEY);
|
|
hash_public_key (md, packet->pkt.public_key);
|
|
rc = check_signature_end_simple (signer, sig, md);
|
|
}
|
|
else if (IS_BACK_SIG (sig))
|
|
{
|
|
log_assert (packet->pkttype == PKT_PUBLIC_KEY);
|
|
hash_public_key (md, packet->pkt.public_key);
|
|
hash_public_key (md, signer);
|
|
rc = check_signature_end_simple (signer, sig, md);
|
|
}
|
|
else if (IS_SUBKEY_SIG (sig) || IS_SUBKEY_REV (sig))
|
|
{
|
|
log_assert (packet->pkttype == PKT_PUBLIC_SUBKEY);
|
|
hash_public_key (md, pripk);
|
|
hash_public_key (md, packet->pkt.public_key);
|
|
rc = check_signature_end_simple (signer, sig, md);
|
|
}
|
|
else if (IS_UID_SIG (sig) || IS_UID_REV (sig))
|
|
{
|
|
log_assert (packet->pkttype == PKT_USER_ID);
|
|
hash_public_key (md, pripk);
|
|
hash_uid_packet (packet->pkt.user_id, md, sig);
|
|
rc = check_signature_end_simple (signer, sig, md);
|
|
}
|
|
else
|
|
{
|
|
/* We should never get here. (The first if above should have
|
|
* already caught this error.) */
|
|
BUG ();
|
|
}
|
|
|
|
gcry_md_close (md);
|
|
|
|
leave:
|
|
if (! rc && ret_pk && ret_pk != signer)
|
|
copy_public_key (ret_pk, signer);
|
|
|
|
if (signer_alloced)
|
|
{
|
|
/* We looked up SIGNER; it is not a pointer into KB. */
|
|
release_public_key_parts (signer);
|
|
/* Free if we also allocated the memory. */
|
|
if (signer_alloced == 2)
|
|
xfree (signer);
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
|
|
/* Check that a signature over a key (e.g., a key revocation, key
|
|
* binding, user id certification, etc.) is valid. If the function
|
|
* detects a self-signature, it uses the public key from the specified
|
|
* key block and does not bother looking up the key specified in the
|
|
* signature packet.
|
|
*
|
|
* ROOT is a keyblock.
|
|
*
|
|
* NODE references a signature packet that appears in the keyblock
|
|
* that should be verified.
|
|
*
|
|
* If CHECK_PK is set, the specified key is sometimes preferred for
|
|
* verifying signatures. See the implementation for details.
|
|
*
|
|
* If RET_PK is not NULL, the public key that successfully verified
|
|
* the signature is copied into *RET_PK.
|
|
*
|
|
* If IS_SELFSIG is not NULL, *IS_SELFSIG is set to 1 if NODE is a
|
|
* self-signature.
|
|
*
|
|
* If R_EXPIREDATE is not NULL, *R_EXPIREDATE is set to the expiry
|
|
* date.
|
|
*
|
|
* If R_EXPIRED is not NULL, *R_EXPIRED is set to 1 if PK has been
|
|
* expired (0 otherwise). Note: PK being revoked does not cause this
|
|
* function to fail.
|
|
*
|
|
*
|
|
* If OPT.NO_SIG_CACHE is not set, this function will first check if
|
|
* the result of a previous verification is already cached in the
|
|
* signature packet's data structure.
|
|
*
|
|
* TODO: add r_revoked here as well. It has the same problems as
|
|
* r_expiredate and r_expired and the cache. */
|
|
int
|
|
check_key_signature2 (ctrl_t ctrl,
|
|
kbnode_t root, kbnode_t node, PKT_public_key *check_pk,
|
|
PKT_public_key *ret_pk, int *is_selfsig,
|
|
u32 *r_expiredate, int *r_expired )
|
|
{
|
|
PKT_public_key *pk;
|
|
PKT_signature *sig;
|
|
int algo;
|
|
int rc;
|
|
|
|
if (is_selfsig)
|
|
*is_selfsig = 0;
|
|
if (r_expiredate)
|
|
*r_expiredate = 0;
|
|
if (r_expired)
|
|
*r_expired = 0;
|
|
log_assert (node->pkt->pkttype == PKT_SIGNATURE);
|
|
log_assert (root->pkt->pkttype == PKT_PUBLIC_KEY);
|
|
|
|
pk = root->pkt->pkt.public_key;
|
|
sig = node->pkt->pkt.signature;
|
|
algo = sig->digest_algo;
|
|
|
|
/* Check whether we have cached the result of a previous signature
|
|
* check. Note that we may no longer have the pubkey or hash
|
|
* needed to verify a sig, but can still use the cached value. A
|
|
* cache refresh detects and clears these cases. */
|
|
if ( !opt.no_sig_cache )
|
|
{
|
|
cache_stats.total++;
|
|
if (sig->flags.checked) /* Cached status available. */
|
|
{
|
|
cache_stats.cached++;
|
|
if (is_selfsig)
|
|
{
|
|
u32 keyid[2];
|
|
|
|
keyid_from_pk (pk, keyid);
|
|
if (keyid[0] == sig->keyid[0] && keyid[1] == sig->keyid[1])
|
|
*is_selfsig = 1;
|
|
}
|
|
/* BUG: This is wrong for non-self-sigs... needs to be the
|
|
* actual pk. */
|
|
rc = check_signature_metadata_validity (pk, sig, r_expired, NULL);
|
|
if (rc)
|
|
return rc;
|
|
if (sig->flags.valid)
|
|
{
|
|
cache_stats.goodsig++;
|
|
return 0;
|
|
}
|
|
cache_stats.badsig++;
|
|
return gpg_error (GPG_ERR_BAD_SIGNATURE);
|
|
}
|
|
}
|
|
|
|
rc = openpgp_pk_test_algo(sig->pubkey_algo);
|
|
if (rc)
|
|
return rc;
|
|
rc = openpgp_md_test_algo(algo);
|
|
if (rc)
|
|
return rc;
|
|
|
|
if (IS_KEY_REV (sig))
|
|
{
|
|
u32 keyid[2];
|
|
keyid_from_pk( pk, keyid );
|
|
|
|
/* Is it a designated revoker? */
|
|
if (keyid[0] != sig->keyid[0] || keyid[1] != sig->keyid[1])
|
|
rc = check_revocation_keys (ctrl, pk, sig);
|
|
else
|
|
{
|
|
rc = check_signature_metadata_validity (pk, sig,
|
|
r_expired, NULL);
|
|
if (! rc)
|
|
rc = check_signature_over_key_or_uid (ctrl, pk, sig,
|
|
root, root->pkt,
|
|
is_selfsig, ret_pk);
|
|
}
|
|
}
|
|
else if (IS_SUBKEY_REV (sig) || IS_SUBKEY_SIG (sig))
|
|
{
|
|
kbnode_t snode = find_prev_kbnode (root, node, PKT_PUBLIC_SUBKEY);
|
|
|
|
if (snode)
|
|
{
|
|
rc = check_signature_metadata_validity (pk, sig,
|
|
r_expired, NULL);
|
|
if (! rc)
|
|
{
|
|
/* A subkey revocation (0x28) must be a self-sig, but a
|
|
* subkey signature (0x18) needn't be. */
|
|
rc = check_signature_over_key_or_uid (ctrl,
|
|
IS_SUBKEY_SIG (sig)
|
|
? NULL : pk,
|
|
sig, root, snode->pkt,
|
|
is_selfsig, ret_pk);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (opt.verbose)
|
|
{
|
|
if (IS_SUBKEY_REV (sig))
|
|
log_info (_("key %s: no subkey for subkey"
|
|
" revocation signature\n"), keystr_from_pk(pk));
|
|
else if (sig->sig_class == 0x18)
|
|
log_info(_("key %s: no subkey for subkey"
|
|
" binding signature\n"), keystr_from_pk(pk));
|
|
}
|
|
rc = GPG_ERR_SIG_CLASS;
|
|
}
|
|
}
|
|
else if (IS_KEY_SIG (sig)) /* direct key signature */
|
|
{
|
|
rc = check_signature_metadata_validity (pk, sig,
|
|
r_expired, NULL);
|
|
if (! rc)
|
|
rc = check_signature_over_key_or_uid (ctrl, pk, sig, root, root->pkt,
|
|
is_selfsig, ret_pk);
|
|
}
|
|
else if (IS_UID_SIG (sig) || IS_UID_REV (sig))
|
|
{
|
|
kbnode_t unode = find_prev_kbnode (root, node, PKT_USER_ID);
|
|
|
|
if (unode)
|
|
{
|
|
rc = check_signature_metadata_validity (pk, sig, r_expired, NULL);
|
|
if (! rc)
|
|
{
|
|
/* If this is a self-sig, ignore check_pk. */
|
|
rc = check_signature_over_key_or_uid
|
|
(ctrl,
|
|
keyid_cmp (pk_keyid (pk), sig->keyid) == 0 ? pk : check_pk,
|
|
sig, root, unode->pkt, NULL, ret_pk);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if (!opt.quiet)
|
|
log_info ("key %s: no user ID for key signature packet"
|
|
" of class %02x\n",keystr_from_pk(pk),sig->sig_class);
|
|
rc = GPG_ERR_SIG_CLASS;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
log_info ("sig issued by %s with class %d (digest: %02x %02x)"
|
|
" is not valid over a user id or a key id, ignoring.\n",
|
|
keystr (sig->keyid), sig->sig_class,
|
|
sig->digest_start[0], sig->digest_start[1]);
|
|
rc = gpg_error (GPG_ERR_BAD_SIGNATURE);
|
|
}
|
|
|
|
cache_sig_result (sig, rc);
|
|
|
|
return rc;
|
|
}
|