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g10: Skip signing keys where no secret key is available.

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* g10/getkey.c (finish_lookup): When requiring PUBKEY_USAGE_SIG, skip
over keys where no signing key is available.

--

This should only be relevant when gpg is required to choose which key
to sign with -- if verifying signatures, we already know which subkey
to look at, and indeed gpg doesn't seem to have a problem with this.

This patch comes from
https://bugs.gnupg.org/gnupg/file793/sign-fix.patch

I (dkg) have reviewed and tested it with missing local keys, and it
makes sense to me as the default behavior.  If the user has the secret
key for a signing-capable subkey available and the command is --sign,
it should be used.

If the user has explicitly specified a subkey that happens to be
missing (e.g. with the trailing ! for --default-key 0x${FPR}!) then
this does not override that behavior (the signature will still fail).

GnuPG-bug-id: 1967
Debian-bug-id: 834922

Signed-off-by: Daniel Kahn Gillmor <dkg@fifthhorseman.net>
This commit is contained in:
Simon Arlott 2017-02-05 16:31:35 -05:00 committed by Daniel Kahn Gillmor
parent 247932f367
commit d9fd52afac
1 changed files with 7 additions and 0 deletions
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7
g10/getkey.c
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@ -3549,6 +3549,13 @@ finish_lookup (kbnode_t keyblock, unsigned int req_usage, int want_exact,
continue;
}
if ((req_usage & PUBKEY_USAGE_SIG) && agent_probe_secret_key (NULL, pk))
{
if (DBG_LOOKUP)
log_debug ("\tno secret key for signing\n");
continue;
}
if (DBG_LOOKUP)
log_debug ("\tsubkey might be fine\n");
/* In case a key has a timestamp of 0 set, we make sure