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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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19
doc/gpg.texi
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@ -113,9 +113,12 @@ only one command is allowed. Generally speaking, irrelevant options
are silently ignored, and may not be checked for correctness.
@command{@gpgname} may be run with no commands. In this case it will
perform a reasonable action depending on the type of file it is given
as input (an encrypted message is decrypted, a signature is verified,
a file containing keys is listed, etc.).
print a warning perform a reasonable action depending on the type of
file it is given as input (an encrypted message is decrypted, a
signature is verified, a file containing keys is listed, etc.).
If you run into any problems, please add the option @option{--verbose}
to the invocation to see more diagnostics.
@menu
@ -2387,10 +2390,10 @@ opposite meaning. The options are:
@item self-sigs-only
Accept only self-signatures while importing a key. All other
key-signatures are skipped at an early import stage. This option
key signatures are skipped at an early import stage. This option
can be used with @code{keyserver-options} to mitigate attempts to
flood a key with bogus signatures from a keyserver. The drawback is
that all other valid key-signatures, as required by the Web of Trust
that all other valid key signatures, as required by the Web of Trust
are also not imported.
@item repair-keys
@ -3340,6 +3343,12 @@ weak. See also @option{--allow-weak-digest-algos} to disable
rejection of weak digests. MD5 is always considered weak, and does
not need to be listed explicitly.
@item --allow-weak-key-signatures
@opindex allow-weak-key-signatures
To avoid a minor risk of collision attacks on third-party key
signatures made using SHA-1, those key signatures are considered
invalid. This options allows to override this restriction.
@item --no-default-keyring
@opindex no-default-keyring
Do not add the default keyrings to the list of keyrings. Note that