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Message-ID: <160518591404.2277919.10560122154909780177.stgit@warthog.procyon.org.uk>
Date: Thu, 12 Nov 2020 12:58:34 +0000
From: David Howells <dhowells@...hat.com>
To: herbert@...dor.apana.org.au, bfields@...ldses.org
Cc: dhowells@...hat.com, trond.myklebust@...merspace.com,
linux-crypto@...r.kernel.org, linux-afs@...ts.infradead.org,
linux-cifs@...r.kernel.org, linux-nfs@...r.kernel.org,
linux-fsdevel@...r.kernel.org, netdev@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH 06/18] crypto/krb5: Implement the Kerberos5 rfc3961 get_mic
and verify_mic
Add functions that sign and verify a piece of an skbuff according to
rfc3961 sec 5.4, using Kc to generate a checksum and insert it into the MIC
field in the skbuff in the sign phase then checksum the data and compare it
to the MIC in the verify phase.
Signed-off-by: David Howells <dhowells@...hat.com>
---
crypto/krb5/internal.h | 11 +++
crypto/krb5/main.c | 70 ++++++++++++++++++++
crypto/krb5/rfc3961_simplified.c | 134 ++++++++++++++++++++++++++++++++++++++
include/crypto/krb5.h | 12 +++
4 files changed, 227 insertions(+)
diff --git a/crypto/krb5/internal.h b/crypto/krb5/internal.h
index ce07decf19f0..20b506327491 100644
--- a/crypto/krb5/internal.h
+++ b/crypto/krb5/internal.h
@@ -109,3 +109,14 @@ int rfc3961_decrypt(const struct krb5_enctype *krb5,
struct scatterlist *sg, unsigned nr_sg,
size_t *_offset, size_t *_len,
int *_error_code);
+ssize_t rfc3961_get_mic(const struct krb5_enctype *krb5,
+ struct crypto_shash *shash,
+ const struct krb5_buffer *metadata,
+ struct scatterlist *sg, unsigned nr_sg, size_t sg_len,
+ size_t data_offset, size_t data_len);
+int rfc3961_verify_mic(const struct krb5_enctype *krb5,
+ struct crypto_shash *shash,
+ const struct krb5_buffer *metadata,
+ struct scatterlist *sg, unsigned nr_sg,
+ size_t *_offset, size_t *_len,
+ int *_error_code);
diff --git a/crypto/krb5/main.c b/crypto/krb5/main.c
index db3fc34be272..97b28e40f6d7 100644
--- a/crypto/krb5/main.c
+++ b/crypto/krb5/main.c
@@ -142,3 +142,73 @@ int crypto_krb5_decrypt(const struct krb5_enctype *krb5,
_offset, _len, _error_code);
}
EXPORT_SYMBOL(crypto_krb5_decrypt);
+
+/**
+ * crypto_krb5_get_mic - Apply Kerberos integrity checksum.
+ * @krb5: The encoding to use.
+ * @shash: The keyed hash to use.
+ * @metadata: Metadata to add into the hash before adding the data.
+ * @sg: Scatterlist defining the crypto buffer.
+ * @nr_sg: The number of elements in @sg.
+ * @sg_len: The size of the buffer.
+ * @data_offset: The offset of the data in the @sg buffer.
+ * @data_len: The length of the data.
+ *
+ * Using the specified Kerberos encoding, calculate and insert an integrity
+ * checksum into the buffer.
+ *
+ * The buffer must include space for the checksum at the front.
+ *
+ * Returns the size of the secure blob if successful, -ENOMEM on an allocation
+ * failure, -EFAULT if there is insufficient space, -EMSGSIZE if the gap for
+ * the checksum is too short. Other errors may also be returned from the
+ * crypto layer.
+ */
+ssize_t crypto_krb5_get_mic(const struct krb5_enctype *krb5,
+ struct crypto_shash *shash,
+ const struct krb5_buffer *metadata,
+ struct scatterlist *sg, unsigned nr_sg, size_t sg_len,
+ size_t data_offset, size_t data_len)
+{
+ if (WARN_ON(data_offset > sg_len ||
+ data_len > sg_len ||
+ data_offset > sg_len - data_len))
+ return -EMSGSIZE;
+ return krb5->profile->get_mic(krb5, shash, metadata, sg, nr_sg, sg_len,
+ data_offset, data_len);
+}
+EXPORT_SYMBOL(crypto_krb5_get_mic);
+
+/**
+ * crypto_krb5_verify_mic - Validate and remove Kerberos integrity checksum.
+ * @krb5: The encoding to use.
+ * @shash: The keyed hash to use.
+ * @metadata: Metadata to add into the hash before adding the data.
+ * @sg: Scatterlist defining the crypto buffer.
+ * @nr_sg: The number of elements in @sg.
+ * @_offset: Offset of the secure blob in the buffer; updated to data offset.
+ * @_len: The length of the secure blob; updated to data length.
+ * @_error_code: Set to a Kerberos error code for parsing/validation errors.
+ *
+ * Using the specified Kerberos encoding, check and remove the integrity
+ * checksum.
+ *
+ * If successful, @_offset and @_len are updated to outline the region in which
+ * the data is stored.
+ *
+ * Returns the 0 if successful, -ENOMEM on an allocation failure; sets
+ * *_error_code and returns -EPROTO if the data cannot be parsed or if the
+ * integrity checksum doesn't match). Other errors may also be returned from
+ * the crypto layer.
+ */
+int crypto_krb5_verify_mic(const struct krb5_enctype *krb5,
+ struct crypto_shash *shash,
+ const struct krb5_buffer *metadata,
+ struct scatterlist *sg, unsigned nr_sg,
+ size_t *_offset, size_t *_len,
+ int *_error_code)
+{
+ return krb5->profile->verify_mic(krb5, shash, metadata, sg, nr_sg,
+ _offset, _len, _error_code);
+}
+EXPORT_SYMBOL(crypto_krb5_verify_mic);
diff --git a/crypto/krb5/rfc3961_simplified.c b/crypto/krb5/rfc3961_simplified.c
index 0a5c19b83f51..f779f962b921 100644
--- a/crypto/krb5/rfc3961_simplified.c
+++ b/crypto/krb5/rfc3961_simplified.c
@@ -588,6 +588,138 @@ int rfc3961_decrypt(const struct krb5_enctype *krb5,
return ret;
}
+/*
+ * Generate a checksum over some metadata and part of an skbuff and insert the
+ * MIC into the skbuff immediately prior to the data.
+ */
+ssize_t rfc3961_get_mic(const struct krb5_enctype *krb5,
+ struct crypto_shash *shash,
+ const struct krb5_buffer *metadata,
+ struct scatterlist *sg, unsigned nr_sg, size_t sg_len,
+ size_t data_offset, size_t data_len)
+{
+ struct shash_desc *desc;
+ ssize_t ret, done;
+ size_t bsize;
+ void *buffer, *digest;
+
+ if (WARN_ON(data_offset != krb5->cksum_len))
+ return -EMSGSIZE;
+
+ bsize = krb5_shash_size(shash) +
+ krb5_digest_size(shash);
+ buffer = kzalloc(bsize, GFP_NOFS);
+ if (!buffer)
+ return -ENOMEM;
+
+ /* Calculate the MIC with key Kc and store it into the skb */
+ desc = buffer;
+ desc->tfm = shash;
+ ret = crypto_shash_init(desc);
+ if (ret < 0)
+ goto error;
+
+ if (metadata) {
+ ret = crypto_shash_update(desc, metadata->data, metadata->len);
+ if (ret < 0)
+ goto error;
+ }
+
+ ret = crypto_shash_update_sg(desc, sg, data_offset, data_len);
+ if (ret < 0)
+ goto error;
+
+ digest = buffer + krb5_shash_size(shash);
+ ret = crypto_shash_final(desc, digest);
+ if (ret < 0)
+ goto error;
+
+ ret = -EFAULT;
+ done = sg_pcopy_from_buffer(sg, nr_sg, digest, krb5->cksum_len,
+ data_offset - krb5->cksum_len);
+ if (done != krb5->cksum_len)
+ goto error;
+
+ ret = krb5->cksum_len + data_len;
+
+error:
+ kfree_sensitive(buffer);
+ return ret;
+}
+
+/*
+ * Check the MIC on a region of an skbuff. The offset and length are updated
+ * to reflect the actual content of the secure region.
+ */
+int rfc3961_verify_mic(const struct krb5_enctype *krb5,
+ struct crypto_shash *shash,
+ const struct krb5_buffer *metadata,
+ struct scatterlist *sg, unsigned nr_sg,
+ size_t *_offset, size_t *_len,
+ int *_error_code)
+{
+ struct shash_desc *desc;
+ ssize_t done;
+ size_t bsize, data_offset, data_len, offset = *_offset, len = *_len;
+ void *buffer = NULL;
+ int ret;
+ u8 *cksum, *cksum2;
+
+ if (len < krb5->cksum_len) {
+ *_error_code = 1; //RXGK_SEALED_INCON;
+ return -EPROTO;
+ }
+ data_offset = offset + krb5->cksum_len;
+ data_len = len - krb5->cksum_len;
+
+ bsize = krb5_shash_size(shash) +
+ krb5_digest_size(shash) * 2;
+ buffer = kzalloc(bsize, GFP_NOFS);
+ if (!buffer)
+ return -ENOMEM;
+
+ cksum = buffer +
+ krb5_shash_size(shash);
+ cksum2 = buffer +
+ krb5_shash_size(shash) +
+ krb5_digest_size(shash);
+
+ /* Calculate the MIC */
+ desc = buffer;
+ desc->tfm = shash;
+ ret = crypto_shash_init(desc);
+ if (ret < 0)
+ goto error;
+
+ if (metadata) {
+ ret = crypto_shash_update(desc, metadata->data, metadata->len);
+ if (ret < 0)
+ goto error;
+ }
+
+ crypto_shash_update_sg(desc, sg, data_offset, data_len);
+ crypto_shash_final(desc, cksum);
+
+ ret = -EFAULT;
+ done = sg_pcopy_to_buffer(sg, nr_sg, cksum2, krb5->cksum_len, offset);
+ if (done != krb5->cksum_len)
+ goto error;
+
+ if (memcmp(cksum, cksum2, krb5->cksum_len) != 0) {
+ *_error_code = 1; //RXGK_SEALED_INCON;
+ ret = -EPROTO;
+ goto error;
+ }
+
+ *_offset += krb5->cksum_len;
+ *_len -= krb5->cksum_len;
+ ret = 0;
+
+error:
+ kfree_sensitive(buffer);
+ return ret;
+}
+
const struct krb5_crypto_profile rfc3961_simplified_profile = {
.calc_PRF = rfc3961_calc_PRF,
.calc_Kc = rfc3961_calc_DK,
@@ -595,4 +727,6 @@ const struct krb5_crypto_profile rfc3961_simplified_profile = {
.calc_Ki = rfc3961_calc_DK,
.encrypt = rfc3961_encrypt,
.decrypt = rfc3961_decrypt,
+ .get_mic = rfc3961_get_mic,
+ .verify_mic = rfc3961_verify_mic,
};
diff --git a/include/crypto/krb5.h b/include/crypto/krb5.h
index fb77f70117c1..b83d3d487753 100644
--- a/include/crypto/krb5.h
+++ b/include/crypto/krb5.h
@@ -115,6 +115,18 @@ extern int crypto_krb5_decrypt(const struct krb5_enctype *krb5,
struct scatterlist *sg, unsigned nr_sg,
size_t *_offset, size_t *_len,
int *_error_code);
+extern ssize_t crypto_krb5_get_mic(const struct krb5_enctype *krb5,
+ struct crypto_shash *shash,
+ const struct krb5_buffer *metadata,
+ struct scatterlist *sg, unsigned nr_sg, size_t sg_len,
+ size_t data_offset, size_t data_len);
+extern int crypto_krb5_verify_mic(const struct krb5_enctype *krb5,
+ struct crypto_shash *shash,
+ const struct krb5_buffer *metadata,
+ struct scatterlist *sg, unsigned nr_sg,
+ size_t *_offset, size_t *_len,
+ int *_error_code);
+
/*
* kdf.c
*/
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