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gpg-interface: limit search for primary key fingerprint

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The VALIDSIG status line from GnuPG with --status-fd is documented to
have 9 required and 1 optional fields [1].  The final, and optional,
field is used to specify the fingerprint of the primary key that made
the signature in case it was made by a subkey.  However, this field is
only available for OpenPGP signatures; not for CMS/X.509.

If the VALIDSIG status line does not have the optional 10th field, the
current code will continue reading onto the next status line.  And this
is the case for non-OpenPGP signatures [1].

The consequence is that a subsequent status line may be considered as
the "primary key" for signatures that does not have an actual primary
key.

Limit the search of these 9 or 10 fields to the single line to avoid
this problem.  If the 10th field is missing, report that there is no
primary key fingerprint.

[Reference]

[1] GnuPG Details, General status codes
https://git.gnupg.org/cgi-bin/gitweb.cgi?p=gnupg.git;a=blob;f=doc/DETAILS;h=6ce340e8c04794add995e84308bb3091450bd28f;hb=HEAD#l483

The documentation says:

    VALIDSIG <args>

    The args are:

    - <fingerprint_in_hex>
    - <sig_creation_date>
    - <sig-timestamp>
    - <expire-timestamp>
    - <sig-version>
    - <reserved>
    - <pubkey-algo>
    - <hash-algo>
    - <sig-class>
    - [ <primary-key-fpr> ]

    This status indicates that the signature is cryptographically
    valid. [...] PRIMARY-KEY-FPR is the fingerprint of the primary key
    or identical to the first argument.

    The primary-key-fpr parameter is used for OpenPGP and not available
    for CMS signatures.  [...]

Signed-off-by: Hans Jerry Illikainen <hji@dyntopia.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Hans Jerry Illikainen
2019-11-22 20:23:12 +00:00
committed by Junio C Hamano
parent 392b862e9a
commit 67a6ea6300
2 changed files with 38 additions and 6 deletions
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20
t/t4202-log.sh
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@ -1555,6 +1555,14 @@ test_expect_success GPG 'setup signed branch' '
git commit -S -m signed_commit
'
test_expect_success GPG 'setup signed branch with subkey' '
test_when_finished "git reset --hard && git checkout master" &&
git checkout -b signed-subkey master &&
echo foo >foo &&
git add foo &&
git commit -SB7227189 -m signed_commit
'
test_expect_success GPGSM 'setup signed branch x509' '
test_when_finished "git reset --hard && git checkout master" &&
git checkout -b signed-x509 master &&
@ -1565,6 +1573,18 @@ test_expect_success GPGSM 'setup signed branch x509' '
git commit -S -m signed_commit
'
test_expect_success GPGSM 'log x509 fingerprint' '
echo "F8BF62E0693D0694816377099909C779FA23FD65 | " >expect &&
git log -n1 --format="%GF | %GP" signed-x509 >actual &&
test_cmp expect actual
'
test_expect_success GPGSM 'log OpenPGP fingerprint' '
echo "D4BE22311AD3131E5EDA29A461092E85B7227189" > expect &&
git log -n1 --format="%GP" signed-subkey >actual &&
test_cmp expect actual
'
test_expect_success GPG 'log --graph --show-signature' '
git log --graph --show-signature -n1 signed >actual &&
grep "^| gpg: Signature made" actual &&