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-rwxr-xr-xguix/scripts/substitute.scm45
-rw-r--r--nix/libstore/build.cc73
-rw-r--r--tests/substitute.scm50
3 files changed, 124 insertions, 44 deletions
diff --git a/guix/scripts/substitute.scm b/guix/scripts/substitute.scm
index 25075eedff..17d0002b9f 100755
--- a/guix/scripts/substitute.scm
+++ b/guix/scripts/substitute.scm
@@ -26,6 +26,8 @@
#:use-module (guix combinators)
#:use-module (guix config)
#:use-module (guix records)
+ #:use-module (guix diagnostics)
+ #:use-module (guix i18n)
#:use-module ((guix serialization) #:select (restore-file))
#:autoload (guix scripts discover) (read-substitute-urls)
#:use-module (gcrypt hash)
@@ -256,6 +258,18 @@ connection (typically PORT) is kept open once data has been fetched from URI."
;; for more information.
(contents narinfo-contents))
+(define (narinfo-hash-algorithm+value narinfo)
+ "Return two values: the hash algorithm used by NARINFO and its value as a
+bytevector."
+ (match (string-tokenize (narinfo-hash narinfo)
+ (char-set-complement (char-set #\:)))
+ ((algorithm base32)
+ (values (lookup-hash-algorithm (string->symbol algorithm))
+ (nix-base32-string->bytevector base32)))
+ (_
+ (raise (formatted-message
+ (G_ "invalid narinfo hash: ~s") (narinfo-hash narinfo))))))
+
(define (narinfo-hash->sha256 hash)
"If the string HASH denotes a sha256 hash, return it as a bytevector.
Otherwise return #f."
@@ -1033,7 +1047,9 @@ one. Return #f if URI's scheme is 'file' or #f."
(define* (process-substitution store-item destination
#:key cache-urls acl print-build-trace?)
"Substitute STORE-ITEM (a store file name) from CACHE-URLS, and write it to
-DESTINATION as a nar file. Verify the substitute against ACL."
+DESTINATION as a nar file. Verify the substitute against ACL, and verify its
+hash against what appears in the narinfo. Print a status line on the current
+output port."
(define narinfo
(lookup-narinfo cache-urls store-item
(cut valid-narinfo? <> acl)))
@@ -1044,9 +1060,6 @@ DESTINATION as a nar file. Verify the substitute against ACL."
(let-values (((uri compression file-size)
(narinfo-best-uri narinfo)))
- ;; Tell the daemon what the expected hash of the Nar itself is.
- (format #t "~a~%" (narinfo-hash narinfo))
-
(unless print-build-trace?
(format (current-error-port)
(G_ "Downloading ~a...~%") (uri->string uri)))
@@ -1079,9 +1092,16 @@ DESTINATION as a nar file. Verify the substitute against ACL."
;; closed here, while the child process doing the
;; reporting will close it upon exit.
(decompressed-port (string->symbol compression)
- progress)))
+ progress))
+
+ ;; Compute the actual nar hash as we read it.
+ ((algorithm expected)
+ (narinfo-hash-algorithm+value narinfo))
+ ((hashed get-hash)
+ (open-hash-input-port algorithm input)))
;; Unpack the Nar at INPUT into DESTINATION.
- (restore-file input destination)
+ (restore-file hashed destination)
+ (close-port hashed)
(close-port input)
;; Wait for the reporter to finish.
@@ -1091,8 +1111,17 @@ DESTINATION as a nar file. Verify the substitute against ACL."
;; one to visually separate substitutions.
(display "\n\n" (current-error-port))
- ;; Tell the daemon that we're done.
- (display "success\n" (current-output-port)))))
+ ;; Check whether we got the data announced in NARINFO.
+ (let ((actual (get-hash)))
+ (if (bytevector=? actual expected)
+ ;; Tell the daemon that we're done.
+ (format (current-output-port) "success ~a ~a~%"
+ (narinfo-hash narinfo) (narinfo-size narinfo))
+ ;; The actual data has a different hash than that in NARINFO.
+ (format (current-output-port) "hash-mismatch ~a ~a ~a~%"
+ (hash-algorithm-name algorithm)
+ (bytevector->nix-base32-string expected)
+ (bytevector->nix-base32-string actual)))))))
;;;
diff --git a/nix/libstore/build.cc b/nix/libstore/build.cc
index b5551b87ae..b19471a68f 100644
--- a/nix/libstore/build.cc
+++ b/nix/libstore/build.cc
@@ -2790,10 +2790,6 @@ private:
/* The substituter. */
std::shared_ptr<Agent> substituter;
- /* Either the empty string, or the expected hash as returned by the
- substituter. */
- string expectedHashStr;
-
/* Either the empty string, or the status phrase returned by the
substituter. */
string status;
@@ -3032,36 +3028,47 @@ void SubstitutionGoal::finished()
/* Check the exit status and the build result. */
HashResult hash;
try {
-
- if (status != "success")
- throw SubstError(format("fetching path `%1%' (status: '%2%')")
- % storePath % status);
-
- if (!pathExists(destPath))
- throw SubstError(format("substitute did not produce path `%1%'") % destPath);
-
- if (expectedHashStr == "")
- throw SubstError(format("substituter did not communicate hash for `%1'") % storePath);
-
- hash = hashPath(htSHA256, destPath);
-
- /* Verify the expected hash we got from the substituer. */
- size_t n = expectedHashStr.find(':');
- if (n == string::npos)
- throw Error(format("bad hash from substituter: %1%") % expectedHashStr);
- HashType hashType = parseHashType(string(expectedHashStr, 0, n));
- if (hashType == htUnknown)
- throw Error(format("unknown hash algorithm in `%1%'") % expectedHashStr);
- Hash expectedHash = parseHash16or32(hashType, string(expectedHashStr, n + 1));
- Hash actualHash = hashType == htSHA256 ? hash.first : hashPath(hashType, destPath).first;
- if (expectedHash != actualHash) {
- if (settings.printBuildTrace)
+ auto statusList = tokenizeString<vector<string> >(status);
+
+ if (statusList.empty()) {
+ throw SubstError(format("fetching path `%1%' (empty status: '%2%')")
+ % storePath % status);
+ } else if (statusList[0] == "hash-mismatch") {
+ if (settings.printBuildTrace) {
+ auto hashType = statusList[1];
+ auto expectedHash = statusList[2];
+ auto actualHash = statusList[3];
printMsg(lvlError, format("@ hash-mismatch %1% %2% %3% %4%")
- % storePath % "sha256"
- % printHash16or32(expectedHash)
- % printHash16or32(actualHash));
+ % storePath
+ % hashType % expectedHash % actualHash);
+ }
throw SubstError(format("hash mismatch for substituted item `%1%'") % storePath);
+ } else if (statusList[0] == "success") {
+ if (!pathExists(destPath))
+ throw SubstError(format("substitute did not produce path `%1%'") % destPath);
+
+ std::string hashStr = statusList[1];
+ size_t n = hashStr.find(':');
+ if (n == string::npos)
+ throw Error(format("bad hash from substituter: %1%") % hashStr);
+
+ HashType hashType = parseHashType(string(hashStr, 0, n));
+ switch (hashType) {
+ case htUnknown:
+ throw Error(format("unknown hash algorithm in `%1%'") % hashStr);
+ case htSHA256:
+ hash.first = parseHash16or32(hashType, string(hashStr, n + 1));
+ hash.second = std::atoi(statusList[2].c_str());
+ break;
+ default:
+ /* The database only stores SHA256 hashes, so compute it. */
+ hash = hashPath(htSHA256, destPath);
+ break;
+ }
}
+ else
+ throw SubstError(format("fetching path `%1%' (status: '%2%')")
+ % storePath % status);
} catch (SubstError & e) {
@@ -3123,9 +3130,7 @@ void SubstitutionGoal::handleChildOutput(int fd, const string & data)
string trimmed = (end != string::npos) ? input.substr(0, end) : input;
/* Update the goal's state accordingly. */
- if (expectedHashStr == "") {
- expectedHashStr = trimmed;
- } else if (status == "") {
+ if (status == "") {
status = trimmed;
worker.wakeUp(shared_from_this());
} else {
diff --git a/tests/substitute.scm b/tests/substitute.scm
index b86ce09425..5b42632552 100644
--- a/tests/substitute.scm
+++ b/tests/substitute.scm
@@ -28,7 +28,9 @@
#:use-module (guix base32)
#:use-module ((guix store) #:select (%store-prefix))
#:use-module ((guix ui) #:select (guix-warning-port))
- #:use-module ((guix utils) #:select (call-with-compressed-output-port))
+ #:use-module ((guix utils)
+ #:select (call-with-temporary-directory
+ call-with-compressed-output-port))
#:use-module ((guix build utils)
#:select (mkdir-p delete-file-recursively dump-port))
#:use-module (guix tests http)
@@ -36,6 +38,7 @@
#:use-module (rnrs io ports)
#:use-module (web uri)
#:use-module (ice-9 regex)
+ #:use-module (srfi srfi-11)
#:use-module (srfi srfi-26)
#:use-module (srfi srfi-34)
#:use-module (srfi srfi-35)
@@ -304,7 +307,7 @@ System: mips64el-linux\n")
(lambda ()
(guix-substitute "--substitute")))))
-(test-quit "substitute, invalid hash"
+(test-quit "substitute, invalid narinfo hash"
"no valid substitute"
;; The hash in the signature differs from the hash of %NARINFO.
(with-narinfo (string-append %narinfo "Signature: "
@@ -317,6 +320,49 @@ System: mips64el-linux\n")
(lambda ()
(guix-substitute "--substitute")))))
+(test-equal "substitute, invalid hash"
+ (string-append "hash-mismatch sha256 "
+ (bytevector->nix-base32-string (sha256 #vu8())) " "
+ (let-values (((port get-hash)
+ (open-hash-port (hash-algorithm sha256)))
+ ((content)
+ "Substitutable data."))
+ (write-file-tree "foo" port
+ #:file-type+size
+ (lambda _
+ (values 'regular
+ (string-length content)))
+ #:file-port
+ (lambda _
+ (open-input-string content)))
+ (close-port port)
+ (bytevector->nix-base32-string (get-hash)))
+ "\n")
+
+ ;; Arrange so the actual data hash does not match the 'NarHash' field in the
+ ;; narinfo.
+ (with-output-to-string
+ (lambda ()
+ (let ((narinfo (string-append "StorePath: " (%store-prefix)
+ "/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa-wrong-hash
+URL: example.nar
+Compression: none
+NarHash: sha256:" (bytevector->nix-base32-string (sha256 #vu8())) "
+NarSize: 42
+References:
+Deriver: " (%store-prefix) "/foo.drv
+System: mips64el-linux\n")))
+ (with-narinfo (string-append narinfo "Signature: "
+ (signature-field narinfo) "\n")
+ (call-with-temporary-directory
+ (lambda (directory)
+ (with-input-from-string (string-append
+ "substitute " (%store-prefix)
+ "/aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa-wrong-hash "
+ directory "/wrong-hash\n")
+ (lambda ()
+ (guix-substitute "--substitute"))))))))))
+
(test-quit "substitute, unauthorized key"
"no valid substitute"
(with-narinfo (string-append %narinfo "Signature: "