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gpg: Add option --allow-weak-key-signatures.

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* g10/gpg.c (oAllowWeakKeySignatures): New.
(opts): Add --allow-weak-key-signatures.
(main): Set it.
* g10/options.h (struct opt): Add flags.allow_weak_key_signatures.
* g10/misc.c (print_sha1_keysig_rejected_note): New.
* g10/sig-check.c (check_signature_over_key_or_uid): Print note and
act on new option.

Signed-off-by: Werner Koch <wk@gnupg.org>
This commit is contained in:
Werner Koch 2019-11-07 10:36:17 +01:00
parent f4047f5605
commit e624c41dba
No known key found for this signature in database
GPG key ID: E3FDFF218E45B72B
6 changed files with 45 additions and 6 deletions
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4
g10/sig-check.c
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@ -1012,12 +1012,14 @@ check_signature_over_key_or_uid (ctrl_t ctrl, PKT_public_key *signer,
else if (IS_UID_SIG (sig) || IS_UID_REV (sig))
{
log_assert (packet->pkttype == PKT_USER_ID);
if (sig->digest_algo == DIGEST_ALGO_SHA1 && !*is_selfsig)
if (sig->digest_algo == DIGEST_ALGO_SHA1 && !*is_selfsig
&& !opt.flags.allow_weak_key_signatures)
{
/* If the signature was created using SHA-1 we consider this
* signature invalid because it makes it possible to mount a
* chosen-prefix collision. We don't do this for
* self-signatures, though. */
print_sha1_keysig_rejected_note ();
rc = gpg_error (GPG_ERR_DIGEST_ALGO);
}
else