fuzz: add fuzz_cli_credentials_parse_string

Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>

2 files changed, 62 insertions, 0 deletions

diff --git a/lib/fuzzing/fuzz_cli_credentials_parse_string.c b/lib/fuzzing/fuzz_cli_credentials_parse_string.c
new file mode 100644
index 00000000000..3b88109298d
--- /dev/null
+++ b/lib/fuzzing/fuzz_cli_credentials_parse_string.c
@@ -0,0 +1,57 @@
+/*
+  Fuzz NMB parse_packet
+  Copyright (C) Catalyst IT 2020
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation; either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#include "includes.h"
+#include "auth/credentials/credentials.h"
+#include "fuzzing/fuzzing.h"
+
+#define MAX_LENGTH (1024 * 10)
+char buf[MAX_LENGTH + 1];
+
+const enum credentials_obtained obtained = CRED_UNINITIALISED;
+
+
+int LLVMFuzzerTestOneInput(uint8_t *input, size_t len)
+{
+	TALLOC_CTX *mem_ctx = NULL;
+	struct cli_credentials *credentials = NULL;
+	bool anon;
+	const char *username;
+	const char *domain;
+
+	if (len > MAX_LENGTH) {
+		return 0;
+	}
+
+	memcpy(buf, input, len);
+	buf[len] = '\0';
+
+	mem_ctx = talloc_new(NULL);
+	credentials = cli_credentials_init(mem_ctx);
+
+	cli_credentials_parse_string(credentials, buf, obtained);
+
+	anon = cli_credentials_is_anonymous(credentials);
+
+	cli_credentials_get_ntlm_username_domain(credentials,
+						 mem_ctx,
+						 &username,
+						 &domain);
+
+	talloc_free(mem_ctx);
+	return 0;
+}
diff --git a/lib/fuzzing/wscript_build b/lib/fuzzing/wscript_build
index 8bf0db000cf..1322d713d0b 100644
--- a/lib/fuzzing/wscript_build
+++ b/lib/fuzzing/wscript_build
@@ -77,6 +77,11 @@ bld.SAMBA_BINARY('fuzz_dcerpc_parse_binding',
                  deps='fuzzing dcerpc afl-fuzz-main',
                  fuzzer=True)
 
+bld.SAMBA_BINARY('fuzz_cli_credentials_parse_string',
+                 source='fuzz_cli_credentials_parse_string.c',
+                 deps='fuzzing samba-credentials afl-fuzz-main',
+                 fuzzer=True)
+
 # The fuzz_type and fuzz_function parameters make the built
 # fuzzer take the same input as ndrdump and so the same that
 # could be sent to the client or server as the stub data.