git-authenticate: Factorize 'authenticate-repository'.
* guix/git-authenticate.scm (repository-cache-key) (verify-introductory-commit, authenticate-repository): New procedures. * guix/channels.scm (verify-introductory-commit): Remove. (authenticate-channel): Rewrite in terms of 'authenticate-repository'.
This commit is contained in:
Ludovic Courtès
parent
876d022c03
commit
838f2bdfa8
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@ -315,100 +315,44 @@ result is unspecified."
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(define commit-short-id
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(compose (cut string-take <> 7) oid->string commit-id))
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(define (verify-introductory-commit repository introduction keyring)
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"Raise an exception if the first commit described in INTRODUCTION doesn't
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have the expected signer."
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(define commit-id
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(channel-introduction-first-signed-commit introduction))
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(define actual-signer
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(openpgp-public-key-fingerprint
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(commit-signing-key repository (string->oid commit-id)
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keyring)))
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(define expected-signer
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(channel-introduction-first-commit-signer introduction))
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(unless (bytevector=? expected-signer actual-signer)
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(raise (condition
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(&message
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(message (format #f (G_ "initial commit ~a is signed by '~a' \
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instead of '~a'")
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commit-id
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(openpgp-format-fingerprint actual-signer)
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(openpgp-format-fingerprint expected-signer))))))))
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(define* (authenticate-channel channel checkout commit
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#:key (keyring-reference-prefix "origin/"))
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"Authenticate the given COMMIT of CHANNEL, available at CHECKOUT, a
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directory containing a CHANNEL checkout. Raise an error if authentication
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fails."
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(define intro
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(channel-introduction channel))
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(define cache-key
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(string-append "channels/" (symbol->string (channel-name channel))))
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(define keyring-reference
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(channel-metadata-keyring-reference
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(read-channel-metadata-from-source checkout)))
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(define (make-reporter start-commit end-commit commits)
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(format (current-error-port)
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(G_ "Authenticating channel '~a', commits ~a to ~a (~h new \
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commits)...~%")
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(channel-name channel)
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(commit-short-id start-commit)
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(commit-short-id end-commit)
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(length commits))
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(progress-reporter/bar (length commits)))
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;; XXX: Too bad we need to re-open CHECKOUT.
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(with-repository checkout repository
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(define start-commit
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(commit-lookup repository
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(string->oid
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(channel-introduction-first-signed-commit
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(channel-introduction channel)))))
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(define end-commit
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(commit-lookup repository (string->oid commit)))
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(define cache-key
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(string-append "channels/" (symbol->string (channel-name channel))))
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(define keyring-reference
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(channel-metadata-keyring-reference
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(read-channel-metadata-from-source checkout)))
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(define keyring
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(load-keyring-from-reference repository
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(string-append keyring-reference-prefix
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keyring-reference)))
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(define authenticated-commits
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;; Previously-authenticated commits that don't need to be checked again.
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(filter-map (lambda (id)
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(false-if-exception
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(commit-lookup repository (string->oid id))))
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(previously-authenticated-commits cache-key)))
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(define commits
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;; Commits to authenticate, excluding the closure of
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;; AUTHENTICATED-COMMITS.
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(commit-difference end-commit start-commit
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authenticated-commits))
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(define reporter
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(progress-reporter/bar (length commits)))
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;; When COMMITS is empty, it's because END-COMMIT is in the closure of
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;; START-COMMIT and/or AUTHENTICATED-COMMITS, in which case it's known to
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;; be authentic already.
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(unless (null? commits)
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(format (current-error-port)
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(G_ "Authenticating channel '~a', \
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commits ~a to ~a (~h new commits)...~%")
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(channel-name channel)
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(commit-short-id start-commit)
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(commit-short-id end-commit)
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(length commits))
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;; If it's our first time, verify CHANNEL's introductory commit.
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(when (null? authenticated-commits)
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(verify-introductory-commit repository
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(channel-introduction channel)
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keyring))
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(call-with-progress-reporter reporter
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(lambda (report)
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(authenticate-commits repository commits
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#:keyring keyring
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#:report-progress report)))
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(cache-authenticated-commit cache-key
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(oid->string
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(commit-id end-commit))))))
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(authenticate-repository repository
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(string->oid
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(channel-introduction-first-signed-commit intro))
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(channel-introduction-first-commit-signer intro)
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#:end (string->oid commit)
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#:keyring-reference
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(string-append keyring-reference-prefix
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keyring-reference)
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#:make-reporter make-reporter
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#:cache-key cache-key)))
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(define* (latest-channel-instance store channel
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#:key (patches %patches)
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@ -18,14 +18,18 @@
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(define-module (guix git-authenticate)
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#:use-module (git)
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#:autoload (gcrypt hash) (sha256)
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#:use-module (guix base16)
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#:use-module ((guix git) #:select (false-if-git-not-found))
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#:autoload (guix base64) (base64-encode)
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#:use-module ((guix git)
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#:select (commit-difference false-if-git-not-found))
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#:use-module (guix i18n)
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#:use-module (guix openpgp)
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#:use-module ((guix utils)
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#:select (cache-directory with-atomic-file-output))
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#:use-module ((guix build utils)
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#:select (mkdir-p))
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#:use-module (guix progress)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-11)
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#:use-module (srfi srfi-26)
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@ -44,6 +48,9 @@
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previously-authenticated-commits
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cache-authenticated-commit
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repository-cache-key
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authenticate-repository
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git-authentication-error?
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git-authentication-error-commit
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unsigned-commit-error?
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@ -339,3 +346,95 @@ authenticated (only COMMIT-ID is written to cache, though)."
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(display ";; List of previously-authenticated commits.\n\n"
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port)
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(pretty-print lst port))))))
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;;;
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;;; High-level interface.
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;;;
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(define (repository-cache-key repository)
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"Return a unique key to store the authenticate commit cache for REPOSITORY."
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(string-append "checkouts/"
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(base64-encode
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(sha256 (string->utf8 (repository-directory repository))))))
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(define (verify-introductory-commit repository keyring commit expected-signer)
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"Look up COMMIT in REPOSITORY, and raise an exception if it is not signed by
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EXPECTED-SIGNER."
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(define actual-signer
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(openpgp-public-key-fingerprint
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(commit-signing-key repository (commit-id commit) keyring)))
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(unless (bytevector=? expected-signer actual-signer)
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(raise (condition
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(&message
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(message (format #f (G_ "initial commit ~a is signed by '~a' \
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instead of '~a'")
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(oid->string (commit-id commit))
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(openpgp-format-fingerprint actual-signer)
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(openpgp-format-fingerprint expected-signer))))))))
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(define* (authenticate-repository repository start signer
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#:key
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(keyring-reference "keyring")
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(cache-key (repository-cache-key repository))
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(end (reference-target
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(repository-head repository)))
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(historical-authorizations '())
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(make-reporter
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(const progress-reporter/silent)))
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"Authenticate REPOSITORY up to commit END, an OID. Authentication starts
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with commit START, an OID, which must be signed by SIGNER; an exception is
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raised if that is not the case. Return an alist mapping OpenPGP public keys
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to the number of commits signed by that key that have been traversed.
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The OpenPGP keyring is loaded from KEYRING-REFERENCE in REPOSITORY, where
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KEYRING-REFERENCE is the name of a branch. The list of authenticated commits
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is cached in the authentication cache under CACHE-KEY.
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HISTORICAL-AUTHORIZATIONS must be a list of OpenPGP fingerprints (bytevectors)
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denoting the authorized keys for commits whose parent lack the
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'.guix-authorizations' file."
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(define start-commit
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(commit-lookup repository start))
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(define end-commit
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(commit-lookup repository end))
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(define keyring
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(load-keyring-from-reference repository keyring-reference))
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(define authenticated-commits
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;; Previously-authenticated commits that don't need to be checked again.
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(filter-map (lambda (id)
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(false-if-git-not-found
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(commit-lookup repository (string->oid id))))
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(previously-authenticated-commits cache-key)))
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(define commits
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;; Commits to authenticate, excluding the closure of
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;; AUTHENTICATED-COMMITS.
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(commit-difference end-commit start-commit
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authenticated-commits))
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;; When COMMITS is empty, it's because END-COMMIT is in the closure of
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;; START-COMMIT and/or AUTHENTICATED-COMMITS, in which case it's known to
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;; be authentic already.
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(if (null? commits)
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'()
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(let ((reporter (make-reporter start-commit end-commit commits)))
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;; If it's our first time, verify START-COMMIT's signature.
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(when (null? authenticated-commits)
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(verify-introductory-commit repository keyring
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start-commit signer))
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(let ((stats (call-with-progress-reporter reporter
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(lambda (report)
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(authenticate-commits repository commits
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#:keyring keyring
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#:default-authorizations
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historical-authorizations
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#:report-progress report)))))
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(cache-authenticated-commit cache-key
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(oid->string (commit-id end-commit)))
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stats))))
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