// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2022 Oracle and/or its affiliates.
 *
 * KUnit test of SunRPC's GSS Kerberos mechanism. Subsystem
 * name is "rpcsec_gss_krb5".
 */

#include <kunit/test.h>
#include <kunit/visibility.h>

#include <linux/kernel.h>

#include <linux/sunrpc/xdr.h>
#include <linux/sunrpc/gss_krb5.h>

#include "gss_krb5_internal.h"

MODULE_IMPORT_NS(EXPORTED_FOR_KUNIT_TESTING);

struct gss_krb5_test_param {
	const char			*desc;
	u32				enctype;
	u32				nfold;
	const struct xdr_netobj		*base_key;
	const struct xdr_netobj		*usage;
	const struct xdr_netobj         *plaintext;
	const struct xdr_netobj		*expected_result;
};

static inline void gss_krb5_get_desc(const struct gss_krb5_test_param *param,
				     char *desc)
{
	strscpy(desc, param->desc, KUNIT_PARAM_DESC_SIZE);
}

static void kdf_case(struct kunit *test)
{
	const struct gss_krb5_test_param *param = test->param_value;
	const struct gss_krb5_enctype *gk5e;
	struct xdr_netobj derivedkey;
	int err;

	/* Arrange */
	gk5e = gss_krb5_lookup_enctype(param->enctype);
	KUNIT_ASSERT_NOT_NULL(test, gk5e);

	derivedkey.data = kunit_kzalloc(test, param->expected_result->len,
					GFP_KERNEL);
	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, derivedkey.data);
	derivedkey.len = param->expected_result->len;

	/* Act */
	err = gk5e->derive_key(gk5e, param->base_key, &derivedkey,
			       param->usage, GFP_KERNEL);
	KUNIT_ASSERT_EQ(test, err, 0);

	/* Assert */
	KUNIT_EXPECT_EQ_MSG(test,
			    memcmp(param->expected_result->data,
				   derivedkey.data, derivedkey.len), 0,
			    "key mismatch");
}

#define DEFINE_HEX_XDR_NETOBJ(name, hex_array...)		\
	static const u8 name ## _data[] = { hex_array };	\
	static const struct xdr_netobj name = {			\
		.data	= (u8 *)name##_data,			\
		.len	= sizeof(name##_data),			\
	}

/*
 * RFC 3961 Appendix A.1.  n-fold
 *
 * The n-fold function is defined in section 5.1 of RFC 3961.
 *
 * This test material is copyright (C) The Internet Society (2005).
 */

DEFINE_HEX_XDR_NETOBJ(nfold_test1_plaintext,
		      0x30, 0x31, 0x32, 0x33, 0x34, 0x35
);
DEFINE_HEX_XDR_NETOBJ(nfold_test1_expected_result,
		      0xbe, 0x07, 0x26, 0x31, 0x27, 0x6b, 0x19, 0x55
);

DEFINE_HEX_XDR_NETOBJ(nfold_test2_plaintext,
		      0x70, 0x61, 0x73, 0x73, 0x77, 0x6f, 0x72, 0x64
);
DEFINE_HEX_XDR_NETOBJ(nfold_test2_expected_result,
		      0x78, 0xa0, 0x7b, 0x6c, 0xaf, 0x85, 0xfa
);

DEFINE_HEX_XDR_NETOBJ(nfold_test3_plaintext,
		      0x52, 0x6f, 0x75, 0x67, 0x68, 0x20, 0x43, 0x6f,
		      0x6e, 0x73, 0x65, 0x6e, 0x73, 0x75, 0x73, 0x2c,
		      0x20, 0x61, 0x6e, 0x64, 0x20, 0x52, 0x75, 0x6e,
		      0x6e, 0x69, 0x6e, 0x67, 0x20, 0x43, 0x6f, 0x64,
		      0x65
);
DEFINE_HEX_XDR_NETOBJ(nfold_test3_expected_result,
		      0xbb, 0x6e, 0xd3, 0x08, 0x70, 0xb7, 0xf0, 0xe0
);

DEFINE_HEX_XDR_NETOBJ(nfold_test4_plaintext,
		      0x70, 0x61, 0x73, 0x73, 0x77, 0x6f, 0x72, 0x64
);
DEFINE_HEX_XDR_NETOBJ(nfold_test4_expected_result,
		      0x59, 0xe4, 0xa8, 0xca, 0x7c, 0x03, 0x85, 0xc3,
		      0xc3, 0x7b, 0x3f, 0x6d, 0x20, 0x00, 0x24, 0x7c,
		      0xb6, 0xe6, 0xbd, 0x5b, 0x3e
);

DEFINE_HEX_XDR_NETOBJ(nfold_test5_plaintext,
		      0x4d, 0x41, 0x53, 0x53, 0x41, 0x43, 0x48, 0x56,
		      0x53, 0x45, 0x54, 0x54, 0x53, 0x20, 0x49, 0x4e,
		      0x53, 0x54, 0x49, 0x54, 0x56, 0x54, 0x45, 0x20,
		      0x4f, 0x46, 0x20, 0x54, 0x45, 0x43, 0x48, 0x4e,
		      0x4f, 0x4c, 0x4f, 0x47, 0x59
);
DEFINE_HEX_XDR_NETOBJ(nfold_test5_expected_result,
		      0xdb, 0x3b, 0x0d, 0x8f, 0x0b, 0x06, 0x1e, 0x60,
		      0x32, 0x82, 0xb3, 0x08, 0xa5, 0x08, 0x41, 0x22,
		      0x9a, 0xd7, 0x98, 0xfa, 0xb9, 0x54, 0x0c, 0x1b
);

DEFINE_HEX_XDR_NETOBJ(nfold_test6_plaintext,
		      0x51
);
DEFINE_HEX_XDR_NETOBJ(nfold_test6_expected_result,
		      0x51, 0x8a, 0x54, 0xa2, 0x15, 0xa8, 0x45, 0x2a,
		      0x51, 0x8a, 0x54, 0xa2, 0x15, 0xa8, 0x45, 0x2a,
		      0x51, 0x8a, 0x54, 0xa2, 0x15
);

DEFINE_HEX_XDR_NETOBJ(nfold_test7_plaintext,
		      0x62, 0x61
);
DEFINE_HEX_XDR_NETOBJ(nfold_test7_expected_result,
		      0xfb, 0x25, 0xd5, 0x31, 0xae, 0x89, 0x74, 0x49,
		      0x9f, 0x52, 0xfd, 0x92, 0xea, 0x98, 0x57, 0xc4,
		      0xba, 0x24, 0xcf, 0x29, 0x7e
);

DEFINE_HEX_XDR_NETOBJ(nfold_test_kerberos,
		      0x6b, 0x65, 0x72, 0x62, 0x65, 0x72, 0x6f, 0x73
);
DEFINE_HEX_XDR_NETOBJ(nfold_test8_expected_result,
		      0x6b, 0x65, 0x72, 0x62, 0x65, 0x72, 0x6f, 0x73
);
DEFINE_HEX_XDR_NETOBJ(nfold_test9_expected_result,
		      0x6b, 0x65, 0x72, 0x62, 0x65, 0x72, 0x6f, 0x73,
		      0x7b, 0x9b, 0x5b, 0x2b, 0x93, 0x13, 0x2b, 0x93
);
DEFINE_HEX_XDR_NETOBJ(nfold_test10_expected_result,
		      0x83, 0x72, 0xc2, 0x36, 0x34, 0x4e, 0x5f, 0x15,
		      0x50, 0xcd, 0x07, 0x47, 0xe1, 0x5d, 0x62, 0xca,
		      0x7a, 0x5a, 0x3b, 0xce, 0xa4
);
DEFINE_HEX_XDR_NETOBJ(nfold_test11_expected_result,
		      0x6b, 0x65, 0x72, 0x62, 0x65, 0x72, 0x6f, 0x73,
		      0x7b, 0x9b, 0x5b, 0x2b, 0x93, 0x13, 0x2b, 0x93,
		      0x5c, 0x9b, 0xdc, 0xda, 0xd9, 0x5c, 0x98, 0x99,
		      0xc4, 0xca, 0xe4, 0xde, 0xe6, 0xd6, 0xca, 0xe4
);

static const struct gss_krb5_test_param rfc3961_nfold_test_params[] = {
	{
		.desc			= "64-fold(\"012345\")",
		.nfold			= 64,
		.plaintext		= &nfold_test1_plaintext,
		.expected_result	= &nfold_test1_expected_result,
	},
	{
		.desc			= "56-fold(\"password\")",
		.nfold			= 56,
		.plaintext		= &nfold_test2_plaintext,
		.expected_result	= &nfold_test2_expected_result,
	},
	{
		.desc			= "64-fold(\"Rough Consensus, and Running Code\")",
		.nfold			= 64,
		.plaintext		= &nfold_test3_plaintext,
		.expected_result	= &nfold_test3_expected_result,
	},
	{
		.desc			= "168-fold(\"password\")",
		.nfold			= 168,
		.plaintext		= &nfold_test4_plaintext,
		.expected_result	= &nfold_test4_expected_result,
	},
	{
		.desc			= "192-fold(\"MASSACHVSETTS INSTITVTE OF TECHNOLOGY\")",
		.nfold			= 192,
		.plaintext		= &nfold_test5_plaintext,
		.expected_result	= &nfold_test5_expected_result,
	},
	{
		.desc			= "168-fold(\"Q\")",
		.nfold			= 168,
		.plaintext		= &nfold_test6_plaintext,
		.expected_result	= &nfold_test6_expected_result,
	},
	{
		.desc			= "168-fold(\"ba\")",
		.nfold			= 168,
		.plaintext		= &nfold_test7_plaintext,
		.expected_result	= &nfold_test7_expected_result,
	},
	{
		.desc			= "64-fold(\"kerberos\")",
		.nfold			= 64,
		.plaintext		= &nfold_test_kerberos,
		.expected_result	= &nfold_test8_expected_result,
	},
	{
		.desc			= "128-fold(\"kerberos\")",
		.nfold			= 128,
		.plaintext		= &nfold_test_kerberos,
		.expected_result	= &nfold_test9_expected_result,
	},
	{
		.desc			= "168-fold(\"kerberos\")",
		.nfold			= 168,
		.plaintext		= &nfold_test_kerberos,
		.expected_result	= &nfold_test10_expected_result,
	},
	{
		.desc			= "256-fold(\"kerberos\")",
		.nfold			= 256,
		.plaintext		= &nfold_test_kerberos,
		.expected_result	= &nfold_test11_expected_result,
	},
};

/* Creates the function rfc3961_nfold_gen_params */
KUNIT_ARRAY_PARAM(rfc3961_nfold, rfc3961_nfold_test_params, gss_krb5_get_desc);

static void rfc3961_nfold_case(struct kunit *test)
{
	const struct gss_krb5_test_param *param = test->param_value;
	u8 *result;

	/* Arrange */
	result = kunit_kzalloc(test, 4096, GFP_KERNEL);
	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, result);

	/* Act */
	krb5_nfold(param->plaintext->len * 8, param->plaintext->data,
		   param->expected_result->len * 8, result);

	/* Assert */
	KUNIT_EXPECT_EQ_MSG(test,
			    memcmp(param->expected_result->data,
				   result, param->expected_result->len), 0,
			    "result mismatch");
}

/*
 * RFC 3961 Appendix A.3.  DES3 DR and DK
 *
 * These tests show the derived-random and derived-key values for the
 * des3-hmac-sha1-kd encryption scheme, using the DR and DK functions
 * defined in section 6.3.1.  The input keys were randomly generated;
 * the usage values are from this specification.
 *
 * This test material is copyright (C) The Internet Society (2005).
 */

DEFINE_HEX_XDR_NETOBJ(des3_dk_usage_155,
		      0x00, 0x00, 0x00, 0x01, 0x55
);

DEFINE_HEX_XDR_NETOBJ(des3_dk_usage_1aa,
		      0x00, 0x00, 0x00, 0x01, 0xaa
);

DEFINE_HEX_XDR_NETOBJ(des3_dk_usage_kerberos,
		      0x6b, 0x65, 0x72, 0x62, 0x65, 0x72, 0x6f, 0x73
);

DEFINE_HEX_XDR_NETOBJ(des3_dk_test1_base_key,
		      0xdc, 0xe0, 0x6b, 0x1f, 0x64, 0xc8, 0x57, 0xa1,
		      0x1c, 0x3d, 0xb5, 0x7c, 0x51, 0x89, 0x9b, 0x2c,
		      0xc1, 0x79, 0x10, 0x08, 0xce, 0x97, 0x3b, 0x92
);
DEFINE_HEX_XDR_NETOBJ(des3_dk_test1_derived_key,
		      0x92, 0x51, 0x79, 0xd0, 0x45, 0x91, 0xa7, 0x9b,
		      0x5d, 0x31, 0x92, 0xc4, 0xa7, 0xe9, 0xc2, 0x89,
		      0xb0, 0x49, 0xc7, 0x1f, 0x6e, 0xe6, 0x04, 0xcd
);

DEFINE_HEX_XDR_NETOBJ(des3_dk_test2_base_key,
		      0x5e, 0x13, 0xd3, 0x1c, 0x70, 0xef, 0x76, 0x57,
		      0x46, 0x57, 0x85, 0x31, 0xcb, 0x51, 0xc1, 0x5b,
		      0xf1, 0x1c, 0xa8, 0x2c, 0x97, 0xce, 0xe9, 0xf2
);
DEFINE_HEX_XDR_NETOBJ(des3_dk_test2_derived_key,
		      0x9e, 0x58, 0xe5, 0xa1, 0x46, 0xd9, 0x94, 0x2a,
		      0x10, 0x1c, 0x46, 0x98, 0x45, 0xd6, 0x7a, 0x20,
		      0xe3, 0xc4, 0x25, 0x9e, 0xd9, 0x13, 0xf2, 0x07
);

DEFINE_HEX_XDR_NETOBJ(des3_dk_test3_base_key,
		      0x98, 0xe6, 0xfd, 0x8a, 0x04, 0xa4, 0xb6, 0x85,
		      0x9b, 0x75, 0xa1, 0x76, 0x54, 0x0b, 0x97, 0x52,
		      0xba, 0xd3, 0xec, 0xd6, 0x10, 0xa2, 0x52, 0xbc
);
DEFINE_HEX_XDR_NETOBJ(des3_dk_test3_derived_key,
		      0x13, 0xfe, 0xf8, 0x0d, 0x76, 0x3e, 0x94, 0xec,
		      0x6d, 0x13, 0xfd, 0x2c, 0xa1, 0xd0, 0x85, 0x07,
		      0x02, 0x49, 0xda, 0xd3, 0x98, 0x08, 0xea, 0xbf
);

DEFINE_HEX_XDR_NETOBJ(des3_dk_test4_base_key,
		      0x62, 0x2a, 0xec, 0x25, 0xa2, 0xfe, 0x2c, 0xad,
		      0x70, 0x94, 0x68, 0x0b, 0x7c, 0x64, 0x94, 0x02,
		      0x80, 0x08, 0x4c, 0x1a, 0x7c, 0xec, 0x92, 0xb5
);
DEFINE_HEX_XDR_NETOBJ(des3_dk_test4_derived_key,
		      0xf8, 0xdf, 0xbf, 0x04, 0xb0, 0x97, 0xe6, 0xd9,
		      0xdc, 0x07, 0x02, 0x68, 0x6b, 0xcb, 0x34, 0x89,
		      0xd9, 0x1f, 0xd9, 0xa4, 0x51, 0x6b, 0x70, 0x3e
);

DEFINE_HEX_XDR_NETOBJ(des3_dk_test5_base_key,
		      0xd3, 0xf8, 0x29, 0x8c, 0xcb, 0x16, 0x64, 0x38,
		      0xdc, 0xb9, 0xb9, 0x3e, 0xe5, 0xa7, 0x62, 0x92,
		      0x86, 0xa4, 0x91, 0xf8, 0x38, 0xf8, 0x02, 0xfb
);
DEFINE_HEX_XDR_NETOBJ(des3_dk_test5_derived_key,
		      0x23, 0x70, 0xda, 0x57, 0x5d, 0x2a, 0x3d, 0xa8,
		      0x64, 0xce, 0xbf, 0xdc, 0x52, 0x04, 0xd5, 0x6d,
		      0xf7, 0x79, 0xa7, 0xdf, 0x43, 0xd9, 0xda, 0x43
);

DEFINE_HEX_XDR_NETOBJ(des3_dk_test6_base_key,
		      0xc1, 0x08, 0x16, 0x49, 0xad, 0xa7, 0x43, 0x62,
		      0xe6, 0xa1, 0x45, 0x9d, 0x01, 0xdf, 0xd3, 0x0d,
		      0x67, 0xc2, 0x23, 0x4c, 0x94, 0x07, 0x04, 0xda
);
DEFINE_HEX_XDR_NETOBJ(des3_dk_test6_derived_key,
		      0x34, 0x80, 0x57, 0xec, 0x98, 0xfd, 0xc4, 0x80,
		      0x16, 0x16, 0x1c, 0x2a, 0x4c, 0x7a, 0x94, 0x3e,
		      0x92, 0xae, 0x49, 0x2c, 0x98, 0x91, 0x75, 0xf7
);

DEFINE_HEX_XDR_NETOBJ(des3_dk_test7_base_key,
		      0x5d, 0x15, 0x4a, 0xf2, 0x38, 0xf4, 0x67, 0x13,
		      0x15, 0x57, 0x19, 0xd5, 0x5e, 0x2f, 0x1f, 0x79,
		      0x0d, 0xd6, 0x61, 0xf2, 0x79, 0xa7, 0x91, 0x7c
);
DEFINE_HEX_XDR_NETOBJ(des3_dk_test7_derived_key,
		      0xa8, 0x80, 0x8a, 0xc2, 0x67, 0xda, 0xda, 0x3d,
		      0xcb, 0xe9, 0xa7, 0xc8, 0x46, 0x26, 0xfb, 0xc7,
		      0x61, 0xc2, 0x94, 0xb0, 0x13, 0x15, 0xe5, 0xc1
);

DEFINE_HEX_XDR_NETOBJ(des3_dk_test8_base_key,
		      0x79, 0x85, 0x62, 0xe0, 0x49, 0x85, 0x2f, 0x57,
		      0xdc, 0x8c, 0x34, 0x3b, 0xa1, 0x7f, 0x2c, 0xa1,
		      0xd9, 0x73, 0x94, 0xef, 0xc8, 0xad, 0xc4, 0x43
);
DEFINE_HEX_XDR_NETOBJ(des3_dk_test8_derived_key,
		      0xc8, 0x13, 0xf8, 0x8a, 0x3b, 0xe3, 0xb3, 0x34,
		      0xf7, 0x54, 0x25, 0xce, 0x91, 0x75, 0xfb, 0xe3,
		      0xc8, 0x49, 0x3b, 0x89, 0xc8, 0x70, 0x3b, 0x49
);

DEFINE_HEX_XDR_NETOBJ(des3_dk_test9_base_key,
		      0x26, 0xdc, 0xe3, 0x34, 0xb5, 0x45, 0x29, 0x2f,
		      0x2f, 0xea, 0xb9, 0xa8, 0x70, 0x1a, 0x89, 0xa4,
		      0xb9, 0x9e, 0xb9, 0x94, 0x2c, 0xec, 0xd0, 0x16
);
DEFINE_HEX_XDR_NETOBJ(des3_dk_test9_derived_key,
		      0xf4, 0x8f, 0xfd, 0x6e, 0x83, 0xf8, 0x3e, 0x73,
		      0x54, 0xe6, 0x94, 0xfd, 0x25, 0x2c, 0xf8, 0x3b,
		      0xfe, 0x58, 0xf7, 0xd5, 0xba, 0x37, 0xec, 0x5d
);

static const struct gss_krb5_test_param rfc3961_kdf_test_params[] = {
	{
		.desc			= "des3-hmac-sha1 key derivation case 1",
		.enctype		= ENCTYPE_DES3_CBC_RAW,
		.base_key		= &des3_dk_test1_base_key,
		.usage			= &des3_dk_usage_155,
		.expected_result	= &des3_dk_test1_derived_key,
	},
	{
		.desc			= "des3-hmac-sha1 key derivation case 2",
		.enctype		= ENCTYPE_DES3_CBC_RAW,
		.base_key		= &des3_dk_test2_base_key,
		.usage			= &des3_dk_usage_1aa,
		.expected_result	= &des3_dk_test2_derived_key,
	},
	{
		.desc			= "des3-hmac-sha1 key derivation case 3",
		.enctype		= ENCTYPE_DES3_CBC_RAW,
		.base_key		= &des3_dk_test3_base_key,
		.usage			= &des3_dk_usage_155,
		.expected_result	= &des3_dk_test3_derived_key,
	},
	{
		.desc			= "des3-hmac-sha1 key derivation case 4",
		.enctype		= ENCTYPE_DES3_CBC_RAW,
		.base_key		= &des3_dk_test4_base_key,
		.usage			= &des3_dk_usage_1aa,
		.expected_result	= &des3_dk_test4_derived_key,
	},
	{
		.desc			= "des3-hmac-sha1 key derivation case 5",
		.enctype		= ENCTYPE_DES3_CBC_RAW,
		.base_key		= &des3_dk_test5_base_key,
		.usage			= &des3_dk_usage_kerberos,
		.expected_result	= &des3_dk_test5_derived_key,
	},
	{
		.desc			= "des3-hmac-sha1 key derivation case 6",
		.enctype		= ENCTYPE_DES3_CBC_RAW,
		.base_key		= &des3_dk_test6_base_key,
		.usage			= &des3_dk_usage_155,
		.expected_result	= &des3_dk_test6_derived_key,
	},
	{
		.desc			= "des3-hmac-sha1 key derivation case 7",
		.enctype		= ENCTYPE_DES3_CBC_RAW,
		.base_key		= &des3_dk_test7_base_key,
		.usage			= &des3_dk_usage_1aa,
		.expected_result	= &des3_dk_test7_derived_key,
	},
	{
		.desc			= "des3-hmac-sha1 key derivation case 8",
		.enctype		= ENCTYPE_DES3_CBC_RAW,
		.base_key		= &des3_dk_test8_base_key,
		.usage			= &des3_dk_usage_155,
		.expected_result	= &des3_dk_test8_derived_key,
	},
	{
		.desc			= "des3-hmac-sha1 key derivation case 9",
		.enctype		= ENCTYPE_DES3_CBC_RAW,
		.base_key		= &des3_dk_test9_base_key,
		.usage			= &des3_dk_usage_1aa,
		.expected_result	= &des3_dk_test9_derived_key,
	},
};

/* Creates the function rfc3961_kdf_gen_params */
KUNIT_ARRAY_PARAM(rfc3961_kdf, rfc3961_kdf_test_params, gss_krb5_get_desc);

static struct kunit_case rfc3961_test_cases[] = {
	{
		.name			= "RFC 3961 n-fold",
		.run_case		= rfc3961_nfold_case,
		.generate_params	= rfc3961_nfold_gen_params,
	},
	{
		.name			= "RFC 3961 key derivation",
		.run_case		= kdf_case,
		.generate_params	= rfc3961_kdf_gen_params,
	},
};

static struct kunit_suite rfc3961_suite = {
	.name			= "RFC 3961 tests",
	.test_cases		= rfc3961_test_cases,
};

kunit_test_suites(&rfc3961_suite);

MODULE_DESCRIPTION("Test RPCSEC GSS Kerberos 5 functions");
MODULE_LICENSE("GPL");