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| author | Ludovic Courtès <ludo@gnu.org> | 2022-01-28 17:20:43 +0100 |
|---|---|---|
| committer | Ludovic Courtès <ludo@gnu.org> | 2022-02-14 11:23:08 +0100 |
| commit | ca87601dd97dd9d356409827802eb0f8a3a535f0 (patch) | |
| tree | e3a6c9e4abb95e45c27aa80dcdc9d99a2f661a6e /doc | |
| parent | 87d49346f3072f7b4343b6fb387ee5f9311493b7 (diff) | |
| download | guix-ca87601dd97dd9d356409827802eb0f8a3a535f0.tar guix-ca87601dd97dd9d356409827802eb0f8a3a535f0.tar.gz | |
git-authenticate: Ensure the target is a descendant of the introductory commit.
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
9549f0283a78fe36f2d4ff2a04ef8ad6b0c02604 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.
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/guix.texi | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/doc/guix.texi b/doc/guix.texi index 86dbe9f201..c116be8907 100644 --- a/doc/guix.texi +++ b/doc/guix.texi @@ -5448,7 +5448,9 @@ commit of a channel that should be authenticated. The first time a channel is fetched with @command{guix pull} or @command{guix time-machine}, the command looks up the introductory commit and verifies that it is signed by the specified OpenPGP key. From then on, it -authenticates commits according to the rule above. +authenticates commits according to the rule above. Authentication fails +if the target commit is neither a descendant nor an ancestor of the +introductory commit. Additionally, your channel must provide all the OpenPGP keys that were ever mentioned in @file{.guix-authorizations}, stored as @file{.key} |