From d0ca0c330330270543d4971a641be55f0960e071 Mon Sep 17 00:00:00 2001
From: AdamKorcz <adam@adalogics.com>
Date: Tue, 20 Jul 2021 16:24:20 +0100
Subject: [PATCH] Fuzzing: Add 3 fuzzers

Signed-off-by: AdamKorcz <adam@adalogics.com>
---
 configuration/fuzz.go    | 16 ++++++++++++++++
 reference/fuzz.go        | 12 ++++++++++++
 registry/api/v2/fuzz.go  | 12 ++++++++++++
 script/oss_fuzz_build.sh |  9 +++++++++
 4 files changed, 49 insertions(+)
 create mode 100644 configuration/fuzz.go
 create mode 100644 reference/fuzz.go
 create mode 100644 registry/api/v2/fuzz.go
 create mode 100755 script/oss_fuzz_build.sh

diff --git a/configuration/fuzz.go b/configuration/fuzz.go
new file mode 100644
index 000000000..103bacddc
--- /dev/null
+++ b/configuration/fuzz.go
@@ -0,0 +1,16 @@
+// +build gofuzz
+
+package configuration
+
+import (
+	"bytes"
+)
+
+// ParserFuzzer implements a fuzzer that targets Parser()
+// Export before building
+// nolint:deadcode
+func parserFuzzer(data []byte) int {
+	rd := bytes.NewReader(data)
+	_, _ = Parse(rd)
+	return 1
+}
diff --git a/reference/fuzz.go b/reference/fuzz.go
new file mode 100644
index 000000000..01a0dca9f
--- /dev/null
+++ b/reference/fuzz.go
@@ -0,0 +1,12 @@
+// +build gofuzz
+
+package reference
+
+// fuzzParseNormalizedNamed implements a fuzzer
+// that targets ParseNormalizedNamed
+// Export before building the fuzzer.
+// nolint:deadcode
+func fuzzParseNormalizedNamed(data []byte) int {
+	_, _ = ParseNormalizedNamed(string(data))
+	return 1
+}
diff --git a/registry/api/v2/fuzz.go b/registry/api/v2/fuzz.go
new file mode 100644
index 000000000..24feeaac5
--- /dev/null
+++ b/registry/api/v2/fuzz.go
@@ -0,0 +1,12 @@
+// +build gofuzz
+
+package v2
+
+// FuzzParseForwardedHeader implements a fuzzer
+// that targets parseForwardedHeader
+// Export before building
+// nolint:deadcode
+func fuzzParseForwardedHeader(data []byte) int {
+	_, _, _ = parseForwardedHeader(string(data))
+	return 1
+}
diff --git a/script/oss_fuzz_build.sh b/script/oss_fuzz_build.sh
new file mode 100755
index 000000000..e89fa8a95
--- /dev/null
+++ b/script/oss_fuzz_build.sh
@@ -0,0 +1,9 @@
+#!/bin/bash -eu
+
+sed 's/parserFuzzer/ParserFuzzer/g' -i ./configuration/fuzz.go
+sed 's/fuzzParseNormalizedNamed/FuzzParseNormalizedNamed/g' -i ./reference/fuzz.go
+sed 's/fuzzParseForwardedHeader/FuzzParseForwardedHeader/g' -i ./registry/api/v2/fuzz.go
+
+compile_go_fuzzer github.com/distribution/distribution/v3/configuration ParserFuzzer parser_fuzzer
+compile_go_fuzzer github.com/distribution/distribution/v3/reference FuzzParseNormalizedNamed fuzz_parsed_normalized_named
+compile_go_fuzzer github.com/distribution/distribution/v3/registry/api/v2 FuzzParseForwardedHeader fuzz_parse_forwarded_header