git/t/t7510-signed-commit.sh, branch v2.24.2

commit-tree: add missing --gpg-sign flag

2019-01-22T19:08:35Z

Add --gpg-sign option in commit-tree, which was documented, but not implemented, in 55ca3f99ae. Add tests for the --gpg-sign option. Signed-off-by: Brandon Richardson Signed-off-by: Junio C Hamano

t7510: invoke git as part of &&-chain

2019-01-22T19:08:33Z

If `git commit-tree HEAD^{tree}` fails on us and produces no output on stdout, we will substitute that empty string and execute `git tag ninth-unsigned`, i.e., we will tag HEAD rather than a newly created object. But we are lucky: we have a signature on HEAD, so we should eventually fail the next test, where we verify that "ninth-unsigned" is indeed unsigned. We have a similar problem a few lines later. If `git commit-tree -S` fails with no output, we will happily tag HEAD as "tenth-signed". Here, we are not so lucky. The tag ends up on the same commit as "eighth-signed-alt", and that's a signed commit, so t7510-signed-commit will pass, despite `git commit-tree -S` failing. Make these `git commit-tree` invocations a direct part of the &&-chain, so that we can rely less on luck and set a better example for future tests modeled after this one. Fix a 9/10 copy/paste error while at it. Signed-off-by: Martin Ågren Signed-off-by: Brandon Richardson Signed-off-by: Junio C Hamano

t/t7510-signed-commit.sh: add signing subkey to Eris Discordia key

2018-11-05T02:00:58Z

Add a dedicated signing subkey to the key identified as 'Eris Discordia', and update tests appropriately. GnuPG will now sign commits using the dedicated signing subkey, changing the value of %GK and %GF, and effectively creating a test case for %GF!=%GP. Signed-off-by: Michał Górny Signed-off-by: Junio C Hamano

t/t7510-signed-commit.sh: Add %GP to custom format checks

2018-11-05T02:00:56Z

Test %GP in addition to %GF in custom format checks. With current keyring, both have the same value. Signed-off-by: Michał Górny Signed-off-by: Junio C Hamano

gpg-interface.c: support getting key fingerprint via %GF format

2018-10-22T23:00:09Z

Support processing VALIDSIG status that provides additional information for valid signatures. Use this information to propagate signing key fingerprint and expose it via %GF pretty format. This format can be used to build safer key verification systems that verify the key via complete fingerprint rather than short/long identifier provided by %GK. Signed-off-by: Michał Górny Signed-off-by: Junio C Hamano

gpg-interface.c: detect and reject multiple signatures on commits

2018-10-22T03:42:30Z

GnuPG supports creating signatures consisting of multiple signature packets. If such a signature is verified, it outputs all the status messages for each signature separately. However, git currently does not account for such scenario and gets terribly confused over getting multiple *SIG statuses. For example, if a malicious party alters a signed commit and appends a new untrusted signature, git is going to ignore the original bad signature and report untrusted commit instead. However, %GK and %GS format strings may still expand to the data corresponding to the original signature, potentially tricking the scripts into trusting the malicious commit. Given that the use of multiple signatures is quite rare, git does not support creating them without jumping through a few hoops, and finally supporting them properly would require extensive API improvement, it seems reasonable to just reject them at the moment. Signed-off-by: Michał Górny Signed-off-by: Junio C Hamano

t/t7510: check the validation of the new config gpg.format

2018-07-18T17:02:00Z

Test setting gpg.format to both invalid and valid values. Signed-off-by: Henning Schild Signed-off-by: Junio C Hamano

tests: make forging GPG signed commits and tags more robust

2018-06-11T17:19:03Z

A couple of test scripts create forged GPG signed commits or tags to check that such forgery can't fool various git commands' signature verification. All but one of those test scripts are prone to occasional failures because the forgery creates a bogus GPG signature, and git commands error out with an unexpected error message, e.g. "Commit deadbeef does not have a GPG signature" instead of "... has a bad GPG signature". 't5573-pull-verify-signatures.sh', 't7510-signed-commit.sh' and 't7612-merge-verify-signatures.sh' create forged signed commits like this: git commit -S -m "bad on side" && git cat-file commit side-bad >raw && sed -e "s/bad/forged bad/" raw >forged && git hash-object -w -t commit forged >forged.commit On rare occasions the given pattern occurs not only in the commit message but in the GPG signature as well, and after it's replaced in the signature the resulting signature becomes invalid, GPG will report CRC error and that it couldn't find any signature, which will then ultimately cause the test failure. Since in all three cases the pattern to be replaced during the forgery is the first word of the commit message's subject line, and since the GPG signature in the commit object is indented by a space, let's just anchor those patterns to the beginning of the line to prevent this issue. The test script 't7030-verify-tag.sh' creates a forged signed tag object in a similar way by replacing the pattern "seventh", but the GPG signature in tag objects is not indented by a space, so the above solution is not applicable in this case. However, in the tag object in question the pattern "seventh" occurs not only in the tag message but in the 'tag' header as well. To create a forged tag object it's sufficient to replace only one of the two occurences, so modify the sed script to limit the pattern to the 'tag' header (i.e. a line beginning with "tag ", which, because of the space character, can never occur in the base64-encoded GPG signature). Note that the forgery in 't7004-tag.sh' is not affected by this issue: while 't7004' does create a forged signed tag kind of the same way, it replaces "signed-tag" in the tag object, which, because of the '-' character, can never occur in the base64-encoded GPG signarute. Signed-off-by: SZEDER Gábor Signed-off-by: Junio C Hamano

t7510-signed-commit: use 'test_must_fail'

2018-06-11T17:19:03Z

The two tests 'detect fudged signature' and 'detect fudged signature with NUL' in 't7510-signed-commit.sh' check that 'git verify-commit' errors out when encountering a forged commit, but they do so by running ! git verify-commit ... Use 'test_must_fail' instead, because that would catch potential unexpected errors like a segfault as well. Signed-off-by: SZEDER Gábor Signed-off-by: Junio C Hamano

gpg-interface: use more status letters

2016-10-12T17:41:59Z

According to gpg2's doc/DETAILS: For each signature only one of the codes GOODSIG, BADSIG, EXPSIG, EXPKEYSIG, REVKEYSIG or ERRSIG will be emitted. gpg1 ("classic") behaves the same (although doc/DETAILS differs). Currently, we parse gpg's status output for GOODSIG, BADSIG and trust information and translate that into status codes G, B, U, N for the %G? format specifier. git-verify-* returns success in the GOODSIG case only. This is somewhat in disagreement with gpg, which considers the first 5 of the 6 above as VALIDSIG, but we err on the very safe side. Introduce additional status codes E, X, Y, R for ERRSIG, EXPSIG, EXPKEYSIG, and REVKEYSIG so that a user of %G? gets more information about the absence of a 'G' on first glance. Requested-by: Alex Signed-off-by: Michael J Gruber Signed-off-by: Junio C Hamano