1 files changed, 54 insertions, 0 deletions
diff --git a/fuzz/fuzzer-pubkey.c b/fuzz/fuzzer-pubkey.c
new file mode 100644
index 0000000..7c12cdc
--- /dev/null
+++ b/fuzz/fuzzer-pubkey.c
@@ -0,0 +1,54 @@
+#include "fuzz.h"
+#include "session.h"
+#include "fuzz-wrapfd.h"
+#include "debug.h"
+
+static void setup_fuzzer(void) {
+	fuzz_common_setup();
+}
+
+int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
+	static int once = 0;
+	if (!once) {
+		setup_fuzzer();
+		once = 1;
+	}
+
+	if (fuzz_set_input(Data, Size) == DROPBEAR_FAILURE) {
+		return 0;
+	}
+
+	m_malloc_set_epoch(1);
+
+	if (setjmp(fuzz.jmp) == 0) {
+		buffer *line = buf_getstringbuf(fuzz.input);
+		buffer *keyblob = buf_getstringbuf(fuzz.input);
+
+		unsigned int algolen;
+		char* algoname = buf_getstring(keyblob, &algolen);
+
+		if (signature_type_from_name(algoname, algolen) == DROPBEAR_SIGNKEY_NONE) {
+			dropbear_exit("fuzzer imagined a bogus algorithm");
+		}
+
+		int ret = fuzz_checkpubkey_line(line, 5, "/home/me/authorized_keys",
+			algoname, algolen,
+			keyblob->data, keyblob->len);
+
+		if (ret == DROPBEAR_SUCCESS) {
+			/* fuzz_checkpubkey_line() should have cleaned up for failure */
+			svr_pubkey_options_cleanup();
+		}
+
+		buf_free(line);
+		buf_free(keyblob);
+		m_free(algoname);
+		m_malloc_free_epoch(1, 0);
+	} else {
+		m_malloc_free_epoch(1, 1);
+		TRACE(("dropbear_exit longjmped"))
+		/* dropbear_exit jumped here */
+	}
+
+	return 0;
+}