git/t/t7612-merge-verify-signatures.sh

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#!/bin/sh
test_description='merge signature verification tests'
GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
tests: mark tests relying on the current default for `init.defaultBranch` In addition to the manual adjustment to let the `linux-gcc` CI job run the test suite with `master` and then with `main`, this patch makes sure that GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME is set in all test scripts that currently rely on the initial branch name being `master by default. To determine which test scripts to mark up, the first step was to force-set the default branch name to `master` in - all test scripts that contain the keyword `master`, - t4211, which expects `t/t4211/history.export` with a hard-coded ref to initialize the default branch, - t5560 because it sources `t/t556x_common` which uses `master`, - t8002 and t8012 because both source `t/annotate-tests.sh` which also uses `master`) This trick was performed by this command: $ sed -i '/^ *\. \.\/\(test-lib\|lib-\(bash\|cvs\|git-svn\)\|gitweb-lib\)\.sh$/i\ GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=master\ export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME\ ' $(git grep -l master t/t[0-9]*.sh) \ t/t4211*.sh t/t5560*.sh t/t8002*.sh t/t8012*.sh After that, careful, manual inspection revealed that some of the test scripts containing the needle `master` do not actually rely on a specific default branch name: either they mention `master` only in a comment, or they initialize that branch specificially, or they do not actually refer to the current default branch. Therefore, the aforementioned modification was undone in those test scripts thusly: $ git checkout HEAD -- \ t/t0027-auto-crlf.sh t/t0060-path-utils.sh \ t/t1011-read-tree-sparse-checkout.sh \ t/t1305-config-include.sh t/t1309-early-config.sh \ t/t1402-check-ref-format.sh t/t1450-fsck.sh \ t/t2024-checkout-dwim.sh \ t/t2106-update-index-assume-unchanged.sh \ t/t3040-subprojects-basic.sh t/t3301-notes.sh \ t/t3308-notes-merge.sh t/t3423-rebase-reword.sh \ t/t3436-rebase-more-options.sh \ t/t4015-diff-whitespace.sh t/t4257-am-interactive.sh \ t/t5323-pack-redundant.sh t/t5401-update-hooks.sh \ t/t5511-refspec.sh t/t5526-fetch-submodules.sh \ t/t5529-push-errors.sh t/t5530-upload-pack-error.sh \ t/t5548-push-porcelain.sh \ t/t5552-skipping-fetch-negotiator.sh \ t/t5572-pull-submodule.sh t/t5608-clone-2gb.sh \ t/t5614-clone-submodules-shallow.sh \ t/t7508-status.sh t/t7606-merge-custom.sh \ t/t9302-fast-import-unpack-limit.sh We excluded one set of test scripts in these commands, though: the range of `git p4` tests. The reason? `git p4` stores the (foreign) remote branch in the branch called `p4/master`, which is obviously not the default branch. Manual analysis revealed that only five of these tests actually require a specific default branch name to pass; They were modified thusly: $ sed -i '/^ *\. \.\/lib-git-p4\.sh$/i\ GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=master\ export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME\ ' t/t980[0167]*.sh t/t9811*.sh Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2020-11-18 23:44:19 +00:00
export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
tests: mark tests as passing with SANITIZE=leak When the "ab/various-leak-fixes" topic was merged in [1] only t6021 would fail if the tests were run in the "GIT_TEST_PASSING_SANITIZE_LEAK=check" mode, i.e. to check whether we marked all leak-free tests with "TEST_PASSES_SANITIZE_LEAK=true". Since then we've had various tests starting to pass under SANITIZE=leak. Let's mark those as passing, this is when they started to pass, narrowed down with "git bisect": - t5317-pack-objects-filter-objects.sh: In faebba436e6 (list-objects-filter: plug pattern_list leak, 2022-12-01). - t3210-pack-refs.sh, t5613-info-alternate.sh, t7403-submodule-sync.sh: In 189e97bc4ba (diff: remove parseopts member from struct diff_options, 2022-12-01). - t1408-packed-refs.sh: In ab91f6b7c42 (Merge branch 'rs/diff-parseopts', 2022-12-19). - t0023-crlf-am.sh, t4152-am-subjects.sh, t4254-am-corrupt.sh, t4256-am-format-flowed.sh, t4257-am-interactive.sh, t5403-post-checkout-hook.sh: In a658e881c13 (am: don't pass strvec to apply_parse_options(), 2022-12-13) - t1301-shared-repo.sh, t1302-repo-version.sh: In b07a819c05f (reflog: clear leftovers in reflog_expiry_cleanup(), 2022-12-13). - t1304-default-acl.sh, t1410-reflog.sh, t5330-no-lazy-fetch-with-commit-graph.sh, t5502-quickfetch.sh, t5604-clone-reference.sh, t6014-rev-list-all.sh, t7701-repack-unpack-unreachable.sh: In b0c61be3209 (Merge branch 'rs/reflog-expiry-cleanup', 2022-12-26) - t3800-mktag.sh, t5302-pack-index.sh, t5306-pack-nobase.sh, t5573-pull-verify-signatures.sh, t7612-merge-verify-signatures.sh: In 69bbbe484ba (hash-object: use fsck for object checks, 2023-01-18). - t1451-fsck-buffer.sh: In 8e4309038f0 (fsck: do not assume NUL-termination of buffers, 2023-01-19). - t6501-freshen-objects.sh: In abf2bb895b4 (Merge branch 'jk/hash-object-fsck', 2023-01-30) 1. 9ea1378d046 (Merge branch 'ab/various-leak-fixes', 2022-12-14) Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2023-02-06 23:07:36 +00:00
TEST_PASSES_SANITIZE_LEAK=true
. ./test-lib.sh
. "$TEST_DIRECTORY/lib-gpg.sh"
test_expect_success GPG 'create signed commits' '
echo 1 >file && git add file &&
test_tick && git commit -m initial &&
git tag initial &&
git checkout -b side-signed &&
echo 3 >elif && git add elif &&
test_tick && git commit -S -m "signed on side" &&
git checkout initial &&
git checkout -b side-unsigned &&
echo 3 >foo && git add foo &&
test_tick && git commit -m "unsigned on side" &&
git checkout initial &&
git checkout -b side-bad &&
echo 3 >bar && git add bar &&
test_tick && git commit -S -m "bad on side" &&
git cat-file commit side-bad >raw &&
tests: make forging GPG signed commits and tags more robust 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 <szeder.dev@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-06-04 13:39:26 +00:00
sed -e "s/^bad/forged bad/" raw >forged &&
git hash-object -w -t commit forged >forged.commit &&
git checkout initial &&
git checkout -b side-untrusted &&
echo 3 >baz && git add baz &&
test_tick && git commit -SB7227189 -m "untrusted on side" &&
git checkout main
'
test_expect_success GPG 'merge unsigned commit with verification' '
test_when_finished "git reset --hard && git checkout initial" &&
test_must_fail git merge --ff-only --verify-signatures side-unsigned 2>mergeerror &&
test_i18ngrep "does not have a GPG signature" mergeerror
'
test_expect_success GPG 'merge unsigned commit with merge.verifySignatures=true' '
test_when_finished "git reset --hard && git checkout initial" &&
test_config merge.verifySignatures true &&
test_must_fail git merge --ff-only side-unsigned 2>mergeerror &&
test_i18ngrep "does not have a GPG signature" mergeerror
'
test_expect_success GPG 'merge commit with bad signature with verification' '
test_when_finished "git reset --hard && git checkout initial" &&
test_must_fail git merge --ff-only --verify-signatures $(cat forged.commit) 2>mergeerror &&
test_i18ngrep "has a bad GPG signature" mergeerror
'
test_expect_success GPG 'merge commit with bad signature with merge.verifySignatures=true' '
test_when_finished "git reset --hard && git checkout initial" &&
test_config merge.verifySignatures true &&
test_must_fail git merge --ff-only $(cat forged.commit) 2>mergeerror &&
test_i18ngrep "has a bad GPG signature" mergeerror
'
test_expect_success GPG 'merge commit with untrusted signature with verification' '
test_when_finished "git reset --hard && git checkout initial" &&
test_must_fail git merge --ff-only --verify-signatures side-untrusted 2>mergeerror &&
test_i18ngrep "has an untrusted GPG signature" mergeerror
'
gpg-interface: add minTrustLevel as a configuration option Previously, signature verification for merge and pull operations checked if the key had a trust-level of either TRUST_NEVER or TRUST_UNDEFINED in verify_merge_signature(). If that was the case, the process die()d. The other code paths that did signature verification relied entirely on the return code from check_commit_signature(). And signatures made with a good key, irregardless of its trust level, was considered valid by check_commit_signature(). This difference in behavior might induce users to erroneously assume that the trust level of a key in their keyring is always considered by Git, even for operations where it is not (e.g. during a verify-commit or verify-tag). The way it worked was by gpg-interface.c storing the result from the key/signature status *and* the lowest-two trust levels in the `result` member of the signature_check structure (the last of these status lines that were encountered got written to `result`). These are documented in GPG under the subsection `General status codes` and `Key related`, respectively [1]. The GPG documentation says the following on the TRUST_ status codes [1]: """ These are several similar status codes: - TRUST_UNDEFINED <error_token> - TRUST_NEVER <error_token> - TRUST_MARGINAL [0 [<validation_model>]] - TRUST_FULLY [0 [<validation_model>]] - TRUST_ULTIMATE [0 [<validation_model>]] For good signatures one of these status lines are emitted to indicate the validity of the key used to create the signature. The error token values are currently only emitted by gpgsm. """ My interpretation is that the trust level is conceptionally different from the validity of the key and/or signature. That seems to also have been the assumption of the old code in check_signature() where a result of 'G' (as in GOODSIG) and 'U' (as in TRUST_NEVER or TRUST_UNDEFINED) were both considered a success. The two cases where a result of 'U' had special meaning were in verify_merge_signature() (where this caused git to die()) and in format_commit_one() (where it affected the output of the %G? format specifier). I think it makes sense to refactor the processing of TRUST_ status lines such that users can configure a minimum trust level that is enforced globally, rather than have individual parts of git (e.g. merge) do it themselves (except for a grace period with backward compatibility). I also think it makes sense to not store the trust level in the same struct member as the key/signature status. While the presence of a TRUST_ status code does imply that the signature is good (see the first paragraph in the included snippet above), as far as I can tell, the order of the status lines from GPG isn't well-defined; thus it would seem plausible that the trust level could be overwritten with the key/signature status if they were stored in the same member of the signature_check structure. This patch introduces a new configuration option: gpg.minTrustLevel. It consolidates trust-level verification to gpg-interface.c and adds a new `trust_level` member to the signature_check structure. Backward-compatibility is maintained by introducing a special case in verify_merge_signature() such that if no user-configurable gpg.minTrustLevel is set, then the old behavior of rejecting TRUST_UNDEFINED and TRUST_NEVER is enforced. If, on the other hand, gpg.minTrustLevel is set, then that value overrides the old behavior. Similarly, the %G? format specifier will continue show 'U' for signatures made with a key that has a trust level of TRUST_UNDEFINED or TRUST_NEVER, even though the 'U' character no longer exist in the `result` member of the signature_check structure. A new format specifier, %GT, is also introduced for users that want to show all possible trust levels for a signature. Another approach would have been to simply drop the trust-level requirement in verify_merge_signature(). This would also have made the behavior consistent with other parts of git that perform signature verification. However, requiring a minimum trust level for signing keys does seem to have a real-world use-case. For example, the build system used by the Qubes OS project currently parses the raw output from verify-tag in order to assert a minimum trust level for keys used to sign git tags [2]. [1] https://git.gnupg.org/cgi-bin/gitweb.cgi?p=gnupg.git;a=blob;f=doc/doc/DETAILS;h=bd00006e933ac56719b1edd2478ecd79273eae72;hb=refs/heads/master [2] https://github.com/QubesOS/qubes-builder/blob/9674c1991deef45b1a1b1c71fddfab14ba50dccf/scripts/verify-git-tag#L43 Signed-off-by: Hans Jerry Illikainen <hji@dyntopia.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-12-27 13:55:57 +00:00
test_expect_success GPG 'merge commit with untrusted signature with verification and high minTrustLevel' '
test_when_finished "git reset --hard && git checkout initial" &&
test_config gpg.minTrustLevel marginal &&
test_must_fail git merge --ff-only --verify-signatures side-untrusted 2>mergeerror &&
test_i18ngrep "has an untrusted GPG signature" mergeerror
'
test_expect_success GPG 'merge commit with untrusted signature with verification and low minTrustLevel' '
test_when_finished "git reset --hard && git checkout initial" &&
test_config gpg.minTrustLevel undefined &&
git merge --ff-only --verify-signatures side-untrusted >mergeoutput &&
test_i18ngrep "has a good GPG signature" mergeoutput
'
test_expect_success GPG 'merge commit with untrusted signature with merge.verifySignatures=true' '
test_when_finished "git reset --hard && git checkout initial" &&
test_config merge.verifySignatures true &&
test_must_fail git merge --ff-only side-untrusted 2>mergeerror &&
test_i18ngrep "has an untrusted GPG signature" mergeerror
'
gpg-interface: add minTrustLevel as a configuration option Previously, signature verification for merge and pull operations checked if the key had a trust-level of either TRUST_NEVER or TRUST_UNDEFINED in verify_merge_signature(). If that was the case, the process die()d. The other code paths that did signature verification relied entirely on the return code from check_commit_signature(). And signatures made with a good key, irregardless of its trust level, was considered valid by check_commit_signature(). This difference in behavior might induce users to erroneously assume that the trust level of a key in their keyring is always considered by Git, even for operations where it is not (e.g. during a verify-commit or verify-tag). The way it worked was by gpg-interface.c storing the result from the key/signature status *and* the lowest-two trust levels in the `result` member of the signature_check structure (the last of these status lines that were encountered got written to `result`). These are documented in GPG under the subsection `General status codes` and `Key related`, respectively [1]. The GPG documentation says the following on the TRUST_ status codes [1]: """ These are several similar status codes: - TRUST_UNDEFINED <error_token> - TRUST_NEVER <error_token> - TRUST_MARGINAL [0 [<validation_model>]] - TRUST_FULLY [0 [<validation_model>]] - TRUST_ULTIMATE [0 [<validation_model>]] For good signatures one of these status lines are emitted to indicate the validity of the key used to create the signature. The error token values are currently only emitted by gpgsm. """ My interpretation is that the trust level is conceptionally different from the validity of the key and/or signature. That seems to also have been the assumption of the old code in check_signature() where a result of 'G' (as in GOODSIG) and 'U' (as in TRUST_NEVER or TRUST_UNDEFINED) were both considered a success. The two cases where a result of 'U' had special meaning were in verify_merge_signature() (where this caused git to die()) and in format_commit_one() (where it affected the output of the %G? format specifier). I think it makes sense to refactor the processing of TRUST_ status lines such that users can configure a minimum trust level that is enforced globally, rather than have individual parts of git (e.g. merge) do it themselves (except for a grace period with backward compatibility). I also think it makes sense to not store the trust level in the same struct member as the key/signature status. While the presence of a TRUST_ status code does imply that the signature is good (see the first paragraph in the included snippet above), as far as I can tell, the order of the status lines from GPG isn't well-defined; thus it would seem plausible that the trust level could be overwritten with the key/signature status if they were stored in the same member of the signature_check structure. This patch introduces a new configuration option: gpg.minTrustLevel. It consolidates trust-level verification to gpg-interface.c and adds a new `trust_level` member to the signature_check structure. Backward-compatibility is maintained by introducing a special case in verify_merge_signature() such that if no user-configurable gpg.minTrustLevel is set, then the old behavior of rejecting TRUST_UNDEFINED and TRUST_NEVER is enforced. If, on the other hand, gpg.minTrustLevel is set, then that value overrides the old behavior. Similarly, the %G? format specifier will continue show 'U' for signatures made with a key that has a trust level of TRUST_UNDEFINED or TRUST_NEVER, even though the 'U' character no longer exist in the `result` member of the signature_check structure. A new format specifier, %GT, is also introduced for users that want to show all possible trust levels for a signature. Another approach would have been to simply drop the trust-level requirement in verify_merge_signature(). This would also have made the behavior consistent with other parts of git that perform signature verification. However, requiring a minimum trust level for signing keys does seem to have a real-world use-case. For example, the build system used by the Qubes OS project currently parses the raw output from verify-tag in order to assert a minimum trust level for keys used to sign git tags [2]. [1] https://git.gnupg.org/cgi-bin/gitweb.cgi?p=gnupg.git;a=blob;f=doc/doc/DETAILS;h=bd00006e933ac56719b1edd2478ecd79273eae72;hb=refs/heads/master [2] https://github.com/QubesOS/qubes-builder/blob/9674c1991deef45b1a1b1c71fddfab14ba50dccf/scripts/verify-git-tag#L43 Signed-off-by: Hans Jerry Illikainen <hji@dyntopia.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-12-27 13:55:57 +00:00
test_expect_success GPG 'merge commit with untrusted signature with merge.verifySignatures=true and minTrustLevel' '
test_when_finished "git reset --hard && git checkout initial" &&
test_config merge.verifySignatures true &&
test_config gpg.minTrustLevel marginal &&
test_must_fail git merge --ff-only side-untrusted 2>mergeerror &&
test_i18ngrep "has an untrusted GPG signature" mergeerror
'
test_expect_success GPG 'merge signed commit with verification' '
test_when_finished "git reset --hard && git checkout initial" &&
git merge --verbose --ff-only --verify-signatures side-signed >mergeoutput &&
test_i18ngrep "has a good GPG signature" mergeoutput
'
test_expect_success GPG 'merge signed commit with merge.verifySignatures=true' '
test_when_finished "git reset --hard && git checkout initial" &&
test_config merge.verifySignatures true &&
git merge --verbose --ff-only side-signed >mergeoutput &&
test_i18ngrep "has a good GPG signature" mergeoutput
'
test_expect_success GPG 'merge commit with bad signature without verification' '
test_when_finished "git reset --hard && git checkout initial" &&
git merge $(cat forged.commit)
'
test_expect_success GPG 'merge commit with bad signature with merge.verifySignatures=false' '
test_when_finished "git reset --hard && git checkout initial" &&
test_config merge.verifySignatures false &&
git merge $(cat forged.commit)
'
test_expect_success GPG 'merge commit with bad signature with merge.verifySignatures=true and --no-verify-signatures' '
test_when_finished "git reset --hard && git checkout initial" &&
test_config merge.verifySignatures true &&
git merge --no-verify-signatures $(cat forged.commit)
'
test_expect_success GPG 'merge unsigned commit into unborn branch' '
test_when_finished "git checkout initial" &&
git checkout --orphan unborn &&
test_must_fail git merge --verify-signatures side-unsigned 2>mergeerror &&
test_i18ngrep "does not have a GPG signature" mergeerror
'
test_done