Thread (1 message) 1 message, 1 author, 2024-02-09

Re: [PATCH 2/2] receive-pack: use find_commit_header() in check_nonce()

From: Junio C Hamano <hidden>
Date: 2024-02-09 22:18:25

René Scharfe [off-list ref] writes:
quoted hunk
@@ -620,17 +605,18 @@ static int constant_memequal(const char *a, const char *b, size_t n)
 	for (i = 0; i < n; i++)
 		res |= a[i] ^ b[i];
 	return res;
 }

-static const char *check_nonce(const char *buf, size_t len)
+static const char *check_nonce(const char *buf)
 {
-	char *nonce = find_header(buf, len, "nonce", NULL);
+	size_t noncelen;
+	const char *found = find_commit_header(buf, "nonce", &noncelen);
+	char *nonce = found ? xmemdupz(found, noncelen) : NULL;
OK, the changes to this function are all quite trivially correct.
quoted hunk
 	timestamp_t stamp, ostamp;
 	char *bohmac, *expect = NULL;
 	const char *retval = NONCE_BAD;
-	size_t noncelen;

 	if (!nonce) {
 		retval = NONCE_MISSING;
 		goto leave;
 	} else if (!push_cert_nonce) {
@@ -668,11 +654,10 @@ static const char *check_nonce(const char *buf, size_t len)
 	if (bohmac == nonce || bohmac[0] != '-') {
 		retval = NONCE_BAD;
 		goto leave;
 	}

-	noncelen = strlen(nonce);
 	expect = prepare_push_cert_nonce(service_dir, stamp);
 	if (noncelen != strlen(expect)) {
 		/* This is not even the right size. */
 		retval = NONCE_BAD;
 		goto leave;
@@ -765,11 +750,11 @@ static void prepare_push_cert_sha1(struct child_process *proc)
 		sigcheck.payload = xmemdupz(push_cert.buf, bogs);
 		sigcheck.payload_len = bogs;
 		check_signature(&sigcheck, push_cert.buf + bogs,
 				push_cert.len - bogs);

-		nonce_status = check_nonce(push_cert.buf, bogs);
+		nonce_status = check_nonce(sigcheck.payload);
Hmph.  sigc->payload is used as a read-only member in
check_signature(), and the xmemdupz() copy we made earlier is
readily available as a replacement for the counted (push_cert.buf,
bogs) string.  Very nice finding.
 	}
 	if (!is_null_oid(&push_cert_oid)) {
 		strvec_pushf(&proc->env, "GIT_PUSH_CERT=%s",
 			     oid_to_hex(&push_cert_oid));
 		strvec_pushf(&proc->env, "GIT_PUSH_CERT_SIGNER=%s",
--
2.43.0
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