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guix/tests/git-authenticate.scm
Ludovic Courtès ca87601dd9
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
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.
2022-02-14 11:23:08 +01:00

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;;; GNU Guix --- Functional package management for GNU
;;; Copyright © 2020, 2022 Ludovic Courtès <ludo@gnu.org>
;;;
;;; This file is part of GNU Guix.
;;;
;;; GNU Guix is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Guix is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Guix. If not, see <http://www.gnu.org/licenses/>.
(define-module (test-git-authenticate)
#:use-module (git)
#:use-module (guix git)
#:use-module (guix git-authenticate)
#:use-module ((guix channels) #:select (openpgp-fingerprint))
#:use-module ((guix diagnostics)
#:select (formatted-message? formatted-message-arguments))
#:use-module (guix openpgp)
#:use-module ((guix tests) #:select (random-text))
#:use-module (guix tests git)
#:use-module (guix tests gnupg)
#:use-module (guix build utils)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-34)
#:use-module (srfi srfi-35)
#:use-module (srfi srfi-64)
#:use-module (rnrs bytevectors)
#:use-module (rnrs io ports))
;; Test the (guix git-authenticate) tools.
(define (gpg+git-available?)
(and (which (git-command))
(which (gpg-command)) (which (gpgconf-command))))
(test-begin "git-authenticate")
(unless (which (git-command)) (test-skip 1))
(test-assert "unsigned commits"
(with-temporary-git-repository directory
'((add "a.txt" "A")
(commit "first commit")
(add "b.txt" "B")
(commit "second commit"))
(with-repository directory repository
(let ((commit1 (find-commit repository "first"))
(commit2 (find-commit repository "second")))
(guard (c ((unsigned-commit-error? c)
(oid=? (git-authentication-error-commit c)
(commit-id commit1))))
(authenticate-commits repository (list commit1 commit2)
#:keyring-reference "master")
'failed)))))
(unless (gpg+git-available?) (test-skip 1))
(test-assert "signed commits, SHA1 signature"
(with-fresh-gnupg-setup (list %ed25519-public-key-file
%ed25519-secret-key-file)
;; Force use of SHA1 for signatures.
(call-with-output-file (string-append (getenv "GNUPGHOME") "/gpg.conf")
(lambda (port)
(display "digest-algo sha1" port)))
(with-temporary-git-repository directory
`((add "a.txt" "A")
(add "signer.key" ,(call-with-input-file %ed25519-public-key-file
get-string-all))
(add ".guix-authorizations"
,(object->string
`(authorizations (version 0)
((,(key-fingerprint %ed25519-public-key-file)
(name "Charlie"))))))
(commit "first commit"
(signer ,(key-fingerprint %ed25519-public-key-file))))
(with-repository directory repository
(let ((commit (find-commit repository "first")))
(guard (c ((unsigned-commit-error? c)
(oid=? (git-authentication-error-commit c)
(commit-id commit))))
(authenticate-commits repository (list commit)
#:keyring-reference "master")
'failed))))))
(unless (gpg+git-available?) (test-skip 1))
(test-assert "signed commits, default authorizations"
(with-fresh-gnupg-setup (list %ed25519-public-key-file
%ed25519-secret-key-file)
(with-temporary-git-repository directory
`((add "signer.key" ,(call-with-input-file %ed25519-public-key-file
get-string-all))
(commit "zeroth commit")
(add "a.txt" "A")
(commit "first commit"
(signer ,(key-fingerprint %ed25519-public-key-file)))
(add "b.txt" "B")
(commit "second commit"
(signer ,(key-fingerprint %ed25519-public-key-file))))
(with-repository directory repository
(let ((commit1 (find-commit repository "first"))
(commit2 (find-commit repository "second")))
(authenticate-commits repository (list commit1 commit2)
#:default-authorizations
(list (openpgp-public-key-fingerprint
(read-openpgp-packet
%ed25519-public-key-file)))
#:keyring-reference "master"))))))
(unless (gpg+git-available?) (test-skip 1))
(test-assert "signed commits, .guix-authorizations"
(with-fresh-gnupg-setup (list %ed25519-public-key-file
%ed25519-secret-key-file)
(with-temporary-git-repository directory
`((add "signer.key" ,(call-with-input-file %ed25519-public-key-file
get-string-all))
(add ".guix-authorizations"
,(object->string
`(authorizations (version 0)
((,(key-fingerprint
%ed25519-public-key-file)
(name "Charlie"))))))
(commit "zeroth commit")
(add "a.txt" "A")
(commit "first commit"
(signer ,(key-fingerprint %ed25519-public-key-file)))
(add ".guix-authorizations"
,(object->string `(authorizations (version 0) ()))) ;empty
(commit "second commit"
(signer ,(key-fingerprint %ed25519-public-key-file)))
(add "b.txt" "B")
(commit "third commit"
(signer ,(key-fingerprint %ed25519-public-key-file))))
(with-repository directory repository
(let ((commit1 (find-commit repository "first"))
(commit2 (find-commit repository "second"))
(commit3 (find-commit repository "third")))
;; COMMIT1 and COMMIT2 are fine.
(and (authenticate-commits repository (list commit1 commit2)
#:keyring-reference "master")
;; COMMIT3 is signed by an unauthorized key according to its
;; parent's '.guix-authorizations' file.
(guard (c ((unauthorized-commit-error? c)
(and (oid=? (git-authentication-error-commit c)
(commit-id commit3))
(bytevector=?
(openpgp-public-key-fingerprint
(unauthorized-commit-error-signing-key c))
(openpgp-public-key-fingerprint
(read-openpgp-packet
%ed25519-public-key-file))))))
(authenticate-commits repository
(list commit1 commit2 commit3)
#:keyring-reference "master")
'failed)))))))
(unless (gpg+git-available?) (test-skip 1))
(test-assert "signed commits, .guix-authorizations, unauthorized merge"
(with-fresh-gnupg-setup (list %ed25519-public-key-file
%ed25519-secret-key-file
%ed25519-2-public-key-file
%ed25519-2-secret-key-file)
(with-temporary-git-repository directory
`((add "signer1.key"
,(call-with-input-file %ed25519-public-key-file
get-string-all))
(add "signer2.key"
,(call-with-input-file %ed25519-2-public-key-file
get-string-all))
(add ".guix-authorizations"
,(object->string
`(authorizations (version 0)
((,(key-fingerprint
%ed25519-public-key-file)
(name "Alice"))))))
(commit "zeroth commit")
(add "a.txt" "A")
(commit "first commit"
(signer ,(key-fingerprint %ed25519-public-key-file)))
(branch "devel")
(checkout "devel")
(add "devel/1.txt" "1")
(commit "first devel commit"
(signer ,(key-fingerprint %ed25519-2-public-key-file)))
(checkout "master")
(add "b.txt" "B")
(commit "second commit"
(signer ,(key-fingerprint %ed25519-public-key-file)))
(merge "devel" "merge"
(signer ,(key-fingerprint %ed25519-public-key-file))))
(with-repository directory repository
(let ((master1 (find-commit repository "first commit"))
(master2 (find-commit repository "second commit"))
(devel1 (find-commit repository "first devel commit"))
(merge (find-commit repository "merge")))
(define (correct? c commit)
(and (oid=? (git-authentication-error-commit c)
(commit-id commit))
(bytevector=?
(openpgp-public-key-fingerprint
(unauthorized-commit-error-signing-key c))
(openpgp-public-key-fingerprint
(read-openpgp-packet %ed25519-2-public-key-file)))))
(and (authenticate-commits repository (list master1 master2)
#:keyring-reference "master")
;; DEVEL1 is signed by an unauthorized key according to its
;; parent's '.guix-authorizations' file.
(guard (c ((unauthorized-commit-error? c)
(correct? c devel1)))
(authenticate-commits repository
(list master1 devel1)
#:keyring-reference "master")
#f)
;; MERGE is authorized but one of its ancestors is not.
(guard (c ((unauthorized-commit-error? c)
(correct? c devel1)))
(authenticate-commits repository
(list master1 master2
devel1 merge)
#:keyring-reference "master")
#f)))))))
(unless (gpg+git-available?) (test-skip 1))
(test-assert "signed commits, .guix-authorizations, authorized merge"
(with-fresh-gnupg-setup (list %ed25519-public-key-file
%ed25519-secret-key-file
%ed25519-2-public-key-file
%ed25519-2-secret-key-file)
(with-temporary-git-repository directory
`((add "signer1.key"
,(call-with-input-file %ed25519-public-key-file
get-string-all))
(add "signer2.key"
,(call-with-input-file %ed25519-2-public-key-file
get-string-all))
(add ".guix-authorizations"
,(object->string
`(authorizations (version 0)
((,(key-fingerprint
%ed25519-public-key-file)
(name "Alice"))))))
(commit "zeroth commit")
(add "a.txt" "A")
(commit "first commit"
(signer ,(key-fingerprint %ed25519-public-key-file)))
(branch "devel")
(checkout "devel")
(add ".guix-authorizations"
,(object->string ;add the second signer
`(authorizations (version 0)
((,(key-fingerprint
%ed25519-public-key-file)
(name "Alice"))
(,(key-fingerprint
%ed25519-2-public-key-file))))))
(commit "first devel commit"
(signer ,(key-fingerprint %ed25519-public-key-file)))
(add "devel/2.txt" "2")
(commit "second devel commit"
(signer ,(key-fingerprint %ed25519-2-public-key-file)))
(checkout "master")
(add "b.txt" "B")
(commit "second commit"
(signer ,(key-fingerprint %ed25519-public-key-file)))
(merge "devel" "merge"
(signer ,(key-fingerprint %ed25519-public-key-file)))
;; After the merge, the second signer is authorized.
(add "c.txt" "C")
(commit "third commit"
(signer ,(key-fingerprint %ed25519-2-public-key-file))))
(with-repository directory repository
(let ((master1 (find-commit repository "first commit"))
(master2 (find-commit repository "second commit"))
(devel1 (find-commit repository "first devel commit"))
(devel2 (find-commit repository "second devel commit"))
(merge (find-commit repository "merge"))
(master3 (find-commit repository "third commit")))
(authenticate-commits repository
(list master1 master2 devel1 devel2
merge master3)
#:keyring-reference "master"))))))
(unless (gpg+git-available?) (test-skip 1))
(test-assert "signed commits, .guix-authorizations removed"
(with-fresh-gnupg-setup (list %ed25519-public-key-file
%ed25519-secret-key-file)
(with-temporary-git-repository directory
`((add "signer.key" ,(call-with-input-file %ed25519-public-key-file
get-string-all))
(add ".guix-authorizations"
,(object->string
`(authorizations (version 0)
((,(key-fingerprint
%ed25519-public-key-file)
(name "Charlie"))))))
(commit "zeroth commit")
(add "a.txt" "A")
(commit "first commit"
(signer ,(key-fingerprint %ed25519-public-key-file)))
(remove ".guix-authorizations")
(commit "second commit"
(signer ,(key-fingerprint %ed25519-public-key-file)))
(add "b.txt" "B")
(commit "third commit"
(signer ,(key-fingerprint %ed25519-public-key-file))))
(with-repository directory repository
(let ((commit1 (find-commit repository "first"))
(commit2 (find-commit repository "second"))
(commit3 (find-commit repository "third")))
;; COMMIT1 and COMMIT2 are fine.
(and (authenticate-commits repository (list commit1 commit2)
#:keyring-reference "master")
;; COMMIT3 is rejected because COMMIT2 removes
;; '.guix-authorizations'.
(guard (c ((unauthorized-commit-error? c)
(oid=? (git-authentication-error-commit c)
(commit-id commit2))))
(authenticate-commits repository
(list commit1 commit2 commit3)
#:keyring-reference "master")
'failed)))))))
(unless (gpg+git-available?) (test-skip 1))
(test-assert "introductory commit, valid signature"
(with-fresh-gnupg-setup (list %ed25519-public-key-file
%ed25519-secret-key-file)
(let ((fingerprint (key-fingerprint %ed25519-public-key-file)))
(with-temporary-git-repository directory
`((add "signer.key" ,(call-with-input-file %ed25519-public-key-file
get-string-all))
(add ".guix-authorizations"
,(object->string
`(authorizations (version 0)
((,(key-fingerprint
%ed25519-public-key-file)
(name "Charlie"))))))
(commit "zeroth commit" (signer ,fingerprint))
(add "a.txt" "A")
(commit "first commit" (signer ,fingerprint)))
(with-repository directory repository
(let ((commit0 (find-commit repository "zero"))
(commit1 (find-commit repository "first")))
;; COMMIT0 is signed with the right key, and COMMIT1 is fine.
(authenticate-repository repository
(commit-id commit0)
(openpgp-fingerprint fingerprint)
#:keyring-reference "master"
#:cache-key (random-text))))))))
(unless (gpg+git-available?) (test-skip 1))
(test-equal "introductory commit, missing signature"
'intro-lacks-signature
(with-fresh-gnupg-setup (list %ed25519-public-key-file
%ed25519-secret-key-file)
(let ((fingerprint (key-fingerprint %ed25519-public-key-file)))
(with-temporary-git-repository directory
`((add "signer.key" ,(call-with-input-file %ed25519-public-key-file
get-string-all))
(add ".guix-authorizations"
,(object->string
`(authorizations (version 0)
((,(key-fingerprint
%ed25519-public-key-file)
(name "Charlie"))))))
(commit "zeroth commit") ;unsigned!
(add "a.txt" "A")
(commit "first commit" (signer ,fingerprint)))
(with-repository directory repository
(let ((commit0 (find-commit repository "zero")))
;; COMMIT0 is not signed.
(guard (c ((formatted-message? c)
;; Message like "commit ~a lacks a signature".
(and (equal? (formatted-message-arguments c)
(list (oid->string (commit-id commit0))))
'intro-lacks-signature)))
(authenticate-repository repository
(commit-id commit0)
(openpgp-fingerprint fingerprint)
#:keyring-reference "master"
#:cache-key (random-text)))))))))
(unless (gpg+git-available?) (test-skip 1))
(test-equal "introductory commit, wrong signature"
'wrong-intro-signing-key
(with-fresh-gnupg-setup (list %ed25519-public-key-file
%ed25519-secret-key-file
%ed25519-2-public-key-file
%ed25519-2-secret-key-file)
(let ((fingerprint (key-fingerprint %ed25519-public-key-file))
(wrong-fingerprint (key-fingerprint %ed25519-2-public-key-file)))
(with-temporary-git-repository directory
`((add "signer1.key" ,(call-with-input-file %ed25519-public-key-file
get-string-all))
(add "signer2.key" ,(call-with-input-file %ed25519-2-public-key-file
get-string-all))
(add ".guix-authorizations"
,(object->string
`(authorizations (version 0)
((,(key-fingerprint
%ed25519-public-key-file)
(name "Charlie"))))))
(commit "zeroth commit" (signer ,wrong-fingerprint))
(add "a.txt" "A")
(commit "first commit" (signer ,fingerprint)))
(with-repository directory repository
(let ((commit0 (find-commit repository "zero"))
(commit1 (find-commit repository "first")))
;; COMMIT0 is signed with the wrong key--not the one passed as the
;; SIGNER argument to 'authenticate-repository'.
(guard (c ((formatted-message? c)
;; Message like "commit ~a signed by ~a instead of ~a".
(and (equal? (formatted-message-arguments c)
(list (oid->string (commit-id commit0))
wrong-fingerprint fingerprint))
'wrong-intro-signing-key)))
(authenticate-repository repository
(commit-id commit0)
(openpgp-fingerprint fingerprint)
#:keyring-reference "master"
#:cache-key (random-text)))))))))
(unless (gpg+git-available?) (test-skip 1))
(test-equal "authenticate-repository, target not a descendant of intro"
'target-commit-not-a-descendant-of-intro
(with-fresh-gnupg-setup (list %ed25519-public-key-file
%ed25519-secret-key-file)
(let ((fingerprint (key-fingerprint %ed25519-public-key-file)))
(with-temporary-git-repository directory
`((add "signer.key" ,(call-with-input-file %ed25519-public-key-file
get-string-all))
(add ".guix-authorizations"
,(object->string
`(authorizations (version 0)
((,(key-fingerprint
%ed25519-public-key-file)
(name "Charlie"))))))
(commit "zeroth commit" (signer ,fingerprint))
(branch "pre-intro-branch")
(checkout "pre-intro-branch")
(add "b.txt" "B")
(commit "alternate commit" (signer ,fingerprint))
(checkout "master")
(add "a.txt" "A")
(commit "first commit" (signer ,fingerprint))
(add "c.txt" "C")
(commit "second commit" (signer ,fingerprint)))
(with-repository directory repository
(let ((commit1 (find-commit repository "first"))
(commit-alt
(commit-lookup repository
(reference-target
(branch-lookup repository
"pre-intro-branch")))))
(guard (c ((formatted-message? c)
(and (equal? (formatted-message-arguments c)
(list (oid->string (commit-id commit-alt))
(oid->string (commit-id commit1))))
'target-commit-not-a-descendant-of-intro)))
(authenticate-repository repository
(commit-id commit1)
(openpgp-fingerprint fingerprint)
#:end (commit-id commit-alt)
#:keyring-reference "master"
#:cache-key (random-text)))))))))
(test-end "git-authenticate")
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