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SUNRPC: Add encryption self-tests

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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@redhat.com>
Reviewed-by: Simo Sorce <simo@redhat.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever 2023-01-15 12:24:38 -05:00
parent 4d2d15c0f1
commit c4a9f0552c
3 changed files with 142 additions and 5 deletions
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20
net/sunrpc/auth_gss/gss_krb5_crypto.c
View file

@ -713,10 +713,21 @@ 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;
@ -752,6 +763,7 @@ 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,

3
net/sunrpc/auth_gss/gss_krb5_internal.h
View file

@ -221,6 +221,9 @@ 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);

124
net/sunrpc/auth_gss/gss_krb5_test.c
View file

@ -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");