From: Chuck Lever <chuck.lever@xxxxxxxxxx>
With the KUnit infrastructure recently added, we are free to define
other unit tests particular to our implementation. As an example,
I've added a self-test that encrypts then decrypts a string, and
checks the result.
Tested-by: Scott Mayhew <smayhew@xxxxxxxxxx>
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
---
net/sunrpc/auth_gss/gss_krb5_crypto.c | 20 ++++-
net/sunrpc/auth_gss/gss_krb5_internal.h | 3 +
net/sunrpc/auth_gss/gss_krb5_test.c | 124 +++++++++++++++++++++++++++++++
3 files changed, 142 insertions(+), 5 deletions(-)
diff --git a/net/sunrpc/auth_gss/gss_krb5_crypto.c b/net/sunrpc/auth_gss/gss_krb5_crypto.c
index e37d341a761b..14c21c2e03dc 100644
--- a/net/sunrpc/auth_gss/gss_krb5_crypto.c
+++ b/net/sunrpc/auth_gss/gss_krb5_crypto.c
@@ -708,10 +708,21 @@ int krb5_cbc_cts_encrypt(struct crypto_sync_skcipher *cts_tfm,
}
EXPORT_SYMBOL_IF_KUNIT(krb5_cbc_cts_encrypt);
-static int
-krb5_cbc_cts_decrypt(struct crypto_sync_skcipher *cts_tfm,
- struct crypto_sync_skcipher *cbc_tfm,
- u32 offset, struct xdr_buf *buf)
+/**
+ * krb5_cbc_cts_decrypt - decrypt in CBC mode with CTS
+ * @cts_tfm: CBC cipher with CTS
+ * @cbc_tfm: base CBC cipher
+ * @offset: starting byte offset for plaintext
+ * @buf: OUT: output buffer
+ *
+ * Return values:
+ * %0: decryption successful
+ * negative errno: decryption could not be completed
+ */
+VISIBLE_IF_KUNIT
+int krb5_cbc_cts_decrypt(struct crypto_sync_skcipher *cts_tfm,
+ struct crypto_sync_skcipher *cbc_tfm,
+ u32 offset, struct xdr_buf *buf)
{
u32 blocksize, nblocks, cbcbytes;
struct decryptor_desc desc;
@@ -747,6 +758,7 @@ krb5_cbc_cts_decrypt(struct crypto_sync_skcipher *cts_tfm,
/* Remaining plaintext is handled with CBC-CTS. */
return gss_krb5_cts_crypt(cts_tfm, buf, cbcbytes, desc.iv, NULL, 0);
}
+EXPORT_SYMBOL_IF_KUNIT(krb5_cbc_cts_decrypt);
u32
gss_krb5_aes_encrypt(struct krb5_ctx *kctx, u32 offset,
diff --git a/net/sunrpc/auth_gss/gss_krb5_internal.h b/net/sunrpc/auth_gss/gss_krb5_internal.h
index bcc8992e274a..957aa4e38e9a 100644
--- a/net/sunrpc/auth_gss/gss_krb5_internal.h
+++ b/net/sunrpc/auth_gss/gss_krb5_internal.h
@@ -224,6 +224,9 @@ int krb5_cbc_cts_encrypt(struct crypto_sync_skcipher *cts_tfm,
struct crypto_sync_skcipher *cbc_tfm, u32 offset,
struct xdr_buf *buf, struct page **pages,
u8 *iv, unsigned int ivsize);
+int krb5_cbc_cts_decrypt(struct crypto_sync_skcipher *cts_tfm,
+ struct crypto_sync_skcipher *cbc_tfm,
+ u32 offset, struct xdr_buf *buf);
u32 krb5_etm_checksum(struct crypto_sync_skcipher *cipher,
struct crypto_ahash *tfm, const struct xdr_buf *body,
int body_offset, struct xdr_netobj *cksumout);
diff --git a/net/sunrpc/auth_gss/gss_krb5_test.c b/net/sunrpc/auth_gss/gss_krb5_test.c
index fe3e4b81221a..c287ce15c419 100644
--- a/net/sunrpc/auth_gss/gss_krb5_test.c
+++ b/net/sunrpc/auth_gss/gss_krb5_test.c
@@ -1909,10 +1909,132 @@ static struct kunit_suite rfc8009_suite = {
.test_cases = rfc8009_test_cases,
};
+/*
+ * Encryption self-tests
+ */
+
+DEFINE_STR_XDR_NETOBJ(encrypt_selftest_plaintext,
+ "This is the plaintext for the encryption self-test.");
+
+static const struct gss_krb5_test_param encrypt_selftest_params[] = {
+ {
+ .desc = "aes128-cts-hmac-sha1-96 encryption self-test",
+ .enctype = ENCTYPE_AES128_CTS_HMAC_SHA1_96,
+ .Ke = &rfc3962_encryption_key,
+ .plaintext = &encrypt_selftest_plaintext,
+ },
+ {
+ .desc = "aes256-cts-hmac-sha1-96 encryption self-test",
+ .enctype = ENCTYPE_AES256_CTS_HMAC_SHA1_96,
+ .Ke = &rfc3962_encryption_key,
+ .plaintext = &encrypt_selftest_plaintext,
+ },
+ {
+ .desc = "camellia128-cts-cmac encryption self-test",
+ .enctype = ENCTYPE_CAMELLIA128_CTS_CMAC,
+ .Ke = &camellia128_cts_cmac_Ke,
+ .plaintext = &encrypt_selftest_plaintext,
+ },
+ {
+ .desc = "camellia256-cts-cmac encryption self-test",
+ .enctype = ENCTYPE_CAMELLIA256_CTS_CMAC,
+ .Ke = &camellia256_cts_cmac_Ke,
+ .plaintext = &encrypt_selftest_plaintext,
+ },
+ {
+ .desc = "aes128-cts-hmac-sha256-128 encryption self-test",
+ .enctype = ENCTYPE_AES128_CTS_HMAC_SHA256_128,
+ .Ke = &aes128_cts_hmac_sha256_128_Ke,
+ .plaintext = &encrypt_selftest_plaintext,
+ },
+ {
+ .desc = "aes256-cts-hmac-sha384-192 encryption self-test",
+ .enctype = ENCTYPE_AES256_CTS_HMAC_SHA384_192,
+ .Ke = &aes256_cts_hmac_sha384_192_Ke,
+ .plaintext = &encrypt_selftest_plaintext,
+ },
+};
+
+/* Creates the function encrypt_selftest_gen_params */
+KUNIT_ARRAY_PARAM(encrypt_selftest, encrypt_selftest_params,
+ gss_krb5_get_desc);
+
+/*
+ * Encrypt and decrypt plaintext, and ensure the input plaintext
+ * matches the output plaintext. A confounder is not added in this
+ * case.
+ */
+static void encrypt_selftest_case(struct kunit *test)
+{
+ const struct gss_krb5_test_param *param = test->param_value;
+ struct crypto_sync_skcipher *cts_tfm, *cbc_tfm;
+ const struct gss_krb5_enctype *gk5e;
+ struct xdr_buf buf;
+ void *text;
+ int err;
+
+ /* Arrange */
+ gk5e = gss_krb5_lookup_enctype(param->enctype);
+ KUNIT_ASSERT_NOT_NULL(test, gk5e);
+
+ cbc_tfm = crypto_alloc_sync_skcipher(gk5e->aux_cipher, 0, 0);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cbc_tfm);
+ err = crypto_sync_skcipher_setkey(cbc_tfm, param->Ke->data, param->Ke->len);
+ KUNIT_ASSERT_EQ(test, err, 0);
+
+ cts_tfm = crypto_alloc_sync_skcipher(gk5e->encrypt_name, 0, 0);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, cts_tfm);
+ err = crypto_sync_skcipher_setkey(cts_tfm, param->Ke->data, param->Ke->len);
+ KUNIT_ASSERT_EQ(test, err, 0);
+
+ text = kunit_kzalloc(test, roundup(param->plaintext->len,
+ crypto_sync_skcipher_blocksize(cbc_tfm)),
+ GFP_KERNEL);
+ KUNIT_ASSERT_NOT_ERR_OR_NULL(test, text);
+
+ memcpy(text, param->plaintext->data, param->plaintext->len);
+ memset(&buf, 0, sizeof(buf));
+ buf.head[0].iov_base = text;
+ buf.head[0].iov_len = param->plaintext->len;
+ buf.len = buf.head[0].iov_len;
+
+ /* Act */
+ err = krb5_cbc_cts_encrypt(cts_tfm, cbc_tfm, 0, &buf, NULL, NULL, 0);
+ KUNIT_ASSERT_EQ(test, err, 0);
+ err = krb5_cbc_cts_decrypt(cts_tfm, cbc_tfm, 0, &buf);
+ KUNIT_ASSERT_EQ(test, err, 0);
+
+ /* Assert */
+ KUNIT_EXPECT_EQ_MSG(test,
+ param->plaintext->len, buf.len,
+ "length mismatch");
+ KUNIT_EXPECT_EQ_MSG(test,
+ memcmp(param->plaintext->data,
+ buf.head[0].iov_base, buf.len), 0,
+ "plaintext mismatch");
+
+ crypto_free_sync_skcipher(cts_tfm);
+ crypto_free_sync_skcipher(cbc_tfm);
+}
+
+static struct kunit_case encryption_test_cases[] = {
+ {
+ .name = "Encryption self-tests",
+ .run_case = encrypt_selftest_case,
+ .generate_params = encrypt_selftest_gen_params,
+ },
+};
+
+static struct kunit_suite encryption_test_suite = {
+ .name = "Encryption test suite",
+ .test_cases = encryption_test_cases,
+};
+
kunit_test_suites(&rfc3961_suite,
&rfc3962_suite,
&rfc6803_suite,
- &rfc8009_suite);
+ &rfc8009_suite,
+ &encryption_test_suite);
MODULE_DESCRIPTION("Test RPCSEC GSS Kerberos 5 functions");
MODULE_LICENSE("GPL");
