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gpg: Add "self-sigs-only" and "import-clean" to the keyserver options.

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* g10/gpg.c (main): Change default.
--

Due to the DoS attack on the keyeservers we do not anymore default to
import key signatures.  That makes the keyserver unsuable for getting
keys for the WoT but it still allows to retriev keys - even if that
takes long to download the large keyblocks.

To revert to the old behavior add

  keyserver-optiions  no-self-sigs-only,no-import-clean

to gpg.conf.

GnuPG-bug-id: 4607
Signed-off-by: Werner Koch <wk@gnupg.org>
(cherry picked from commit 23c978640812d123eaffd4108744bdfcf48f7c93)
This commit is contained in:
Werner Koch 2019-07-04 15:45:39 +02:00
parent 4cbd058a3d
commit 2b7151b0a5
No known key found for this signature in database
GPG Key ID: E3FDFF218E45B72B
3 changed files with 26 additions and 1 deletions
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18
NEWS
View File

@ -1,9 +1,27 @@
Noteworthy changes in version 2.2.17 (unreleased)
-------------------------------------------------
* gpg: Ignore all key-signatures received from keyservers. This
change is required to mitigate a DoS due to keys flooded with
faked key-signatures. The old behaviour can be achieved by adding
keyserver-options no-self-sigs-only,no-import-clean
to your gpg.conf. [#4607]
* gpg: If an imported keyblocks is too large to be stored in the
keybox (pubring.kbx) do not error out but fallback to an import
using the options "self-sigs-only,import-clean". [#4591]
* gpg: New command --locate-external-key which can be used to
refresh keys from the Web Key Directory or via other methods
configured with --auto-key-locate.
* gpg: New import option "self-sigs-only".
* dirmngr: Support the "openpgpkey" subdomain feature from
draft-koch-openpgp-webkey-service-07. [#4590].
Release-info: https://dev.gnupg.org/T4606
Noteworthy changes in version 2.2.16 (2019-05-28)
-------------------------------------------------

5
doc/gpg.texi
View File

@ -1917,6 +1917,11 @@ are available for all keyserver types, some common options are:
@end table
The default list of options is: "self-sigs-only, import-clean,
repair-keys, repair-pks-subkey-bug, export-attributes,
honor-pka-record".
@item --completes-needed @var{n}
@opindex compliant-needed
Number of completely trusted users to introduce a new

4
g10/gpg.c
View File

@ -2375,7 +2375,9 @@ main (int argc, char **argv)
opt.import_options = IMPORT_REPAIR_KEYS;
opt.export_options = EXPORT_ATTRIBUTES;
opt.keyserver_options.import_options = (IMPORT_REPAIR_KEYS
| IMPORT_REPAIR_PKS_SUBKEY_BUG);
| IMPORT_REPAIR_PKS_SUBKEY_BUG
| IMPORT_SELF_SIGS_ONLY
| IMPORT_CLEAN);
opt.keyserver_options.export_options = EXPORT_ATTRIBUTES;
opt.keyserver_options.options = KEYSERVER_HONOR_PKA_RECORD;
opt.verify_options = (LIST_SHOW_UID_VALIDITY