Fixes a bug whereby authentication of a commit *not* descending from the
introductory commit could succeed, provided the commit verifies the
authorization invariant.
In the example below, A is a common ancestor of the introductory commit
I and of commit X. Authentication of X would succeed, even though it is
not a descendant of I, as long as X is authorized according to the
'.guix-authorizations' in A:
X I
\ /
A
This is because, 'authenticate-repository' would not check whether X
descends from I, and the call (commit-difference X I) would return X.
In practice that only affects forks because it means that ancestors of
the introductory commit already contain a '.guix-authorizations' file.
* guix/git-authenticate.scm (authenticate-repository): Add call to
'commit-descendant?'.
* tests/channels.scm ("authenticate-channel, not a descendant of introductory commit"):
New test.
* tests/git-authenticate.scm ("authenticate-repository, target not a descendant of intro"):
New test.
* tests/guix-git-authenticate.sh: Expect earlier test to fail since
9549f0283a is not a descendant of
$intro_commit. Add new test targeting an ancestor of the introductory
commit, and another test targeting the v1.2.0 commit.
* doc/guix.texi (Specifying Channel Authorizations): Add a sentence.
These tests mimic similar tests already in 'tests/channels.scm', but
without using the higher-level 'authenticate-channel'.
* tests/git-authenticate.scm ("introductory commit, valid signature")
("introductory commit, missing signature")
("introductory commit, wrong signature"): New tests.
The third key will be used in an upcoming commit.
Rename public keys to .pub.
* guix/tests/gnupg.scm (%ed25519-3-public-key-file): New variable.
(%ed25519-3-secret-key-file): New variable.
(%ed25519-2-public-key-file): Renamed from %ed25519bis-public-key-file.
(%ed25519-2-secret-key-file): Renamed from %ed25519bis-secret-key-file.
* tests/keys/ed25519-3.key: New file.
* tests/keys/ed25519-3.sec: New file.
Signed-off-by: Mathieu Othacehe <othacehe@gnu.org>
Fixes <https://bugs.gnu.org/42077>.
Reported by Jan Nieuwenhuizen <janneke@gnu.org>.
The typo was introduced in 7b06781a58.
* tests/git-authenticate.scm <top level>: Remove call to 'which'
around (gpg+git-available?).
* guix/git-authenticate.scm (commit-signing-key): Add
#:disallowed-hash-algorithms and honor it.
(authenticate-commit)[recent-commit?]: New variable.
Pass #:disallowed-hash-algorithms to 'commit-signing-key'.
* tests/git-authenticate.scm ("signed commits, SHA1 signature"): New test.
