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Subject[PATCH 4.9 053/101] libceph: factor out encrypt_authorizer()
Date
4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ilya Dryomov <idryomov@gmail.com>

commit 149cac4a50b0b4081b38b2f38de6ef71c27eaa85 upstream.

Will be used for encrypting both the initial and updated authorizers.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Sage Weil <sage@redhat.com>
Signed-off-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/ceph/auth_x.c | 49 ++++++++++++++++++++++++++++++++++++-------------
1 file changed, 36 insertions(+), 13 deletions(-)

--- a/net/ceph/auth_x.c
+++ b/net/ceph/auth_x.c
@@ -286,6 +286,38 @@ bad:
return -EINVAL;
}

+/*
+ * Encode and encrypt the second part (ceph_x_authorize_b) of the
+ * authorizer. The first part (ceph_x_authorize_a) should already be
+ * encoded.
+ */
+static int encrypt_authorizer(struct ceph_x_authorizer *au)
+{
+ struct ceph_x_authorize_a *msg_a;
+ struct ceph_x_authorize_b *msg_b;
+ void *p, *end;
+ int ret;
+
+ msg_a = au->buf->vec.iov_base;
+ WARN_ON(msg_a->ticket_blob.secret_id != cpu_to_le64(au->secret_id));
+ p = (void *)(msg_a + 1) + le32_to_cpu(msg_a->ticket_blob.blob_len);
+ end = au->buf->vec.iov_base + au->buf->vec.iov_len;
+
+ msg_b = p + ceph_x_encrypt_offset();
+ msg_b->struct_v = 1;
+ msg_b->nonce = cpu_to_le64(au->nonce);
+
+ ret = ceph_x_encrypt(&au->session_key, p, end - p, sizeof(*msg_b));
+ if (ret < 0)
+ return ret;
+
+ p += ret;
+ WARN_ON(p > end);
+ au->buf->vec.iov_len = p - au->buf->vec.iov_base;
+
+ return 0;
+}
+
static void ceph_x_authorizer_cleanup(struct ceph_x_authorizer *au)
{
ceph_crypto_key_destroy(&au->session_key);
@@ -302,7 +334,6 @@ static int ceph_x_build_authorizer(struc
int maxlen;
struct ceph_x_authorize_a *msg_a;
struct ceph_x_authorize_b *msg_b;
- void *p, *end;
int ret;
int ticket_blob_len =
(th->ticket_blob ? th->ticket_blob->vec.iov_len : 0);
@@ -346,21 +377,13 @@ static int ceph_x_build_authorizer(struc
dout(" th %p secret_id %lld %lld\n", th, th->secret_id,
le64_to_cpu(msg_a->ticket_blob.secret_id));

- p = msg_a + 1;
- p += ticket_blob_len;
- end = au->buf->vec.iov_base + au->buf->vec.iov_len;
-
- msg_b = p + ceph_x_encrypt_offset();
- msg_b->struct_v = 1;
get_random_bytes(&au->nonce, sizeof(au->nonce));
- msg_b->nonce = cpu_to_le64(au->nonce);
- ret = ceph_x_encrypt(&au->session_key, p, end - p, sizeof(*msg_b));
- if (ret < 0)
+ ret = encrypt_authorizer(au);
+ if (ret) {
+ pr_err("failed to encrypt authorizer: %d", ret);
goto out_au;
+ }

- p += ret;
- WARN_ON(p > end);
- au->buf->vec.iov_len = p - au->buf->vec.iov_base;
dout(" built authorizer nonce %llx len %d\n", au->nonce,
(int)au->buf->vec.iov_len);
return 0;

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