4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Ilya Dryomov <idryomov@xxxxxxxxx>
commit c571fe24d243bfe7017f0e67fe800b3cc2a1d1f7 upstream.
Will be used for decrypting the server challenge which is only preceded
by ceph_x_encrypt_header.
Drop struct_v check to allow for extending ceph_x_encrypt_header in the
future.
Signed-off-by: Ilya Dryomov <idryomov@xxxxxxxxx>
Reviewed-by: Sage Weil <sage@xxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben.hutchings@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/ceph/auth_x.c | 33 ++++++++++++++++++++++++---------
1 file changed, 24 insertions(+), 9 deletions(-)
--- a/net/ceph/auth_x.c
+++ b/net/ceph/auth_x.c
@@ -69,25 +69,40 @@ static int ceph_x_encrypt(struct ceph_cr
return sizeof(u32) + ciphertext_len;
}
+static int __ceph_x_decrypt(struct ceph_crypto_key *secret, void *p,
+ int ciphertext_len)
+{
+ struct ceph_x_encrypt_header *hdr = p;
+ int plaintext_len;
+ int ret;
+
+ ret = ceph_crypt(secret, false, p, ciphertext_len, ciphertext_len,
+ &plaintext_len);
+ if (ret)
+ return ret;
+
+ if (le64_to_cpu(hdr->magic) != CEPHX_ENC_MAGIC) {
+ pr_err("%s bad magic\n", __func__);
+ return -EINVAL;
+ }
+
+ return plaintext_len - sizeof(*hdr);
+}
+
static int ceph_x_decrypt(struct ceph_crypto_key *secret, void **p, void *end)
{
- struct ceph_x_encrypt_header *hdr = *p + sizeof(u32);
- int ciphertext_len, plaintext_len;
+ int ciphertext_len;
int ret;
ceph_decode_32_safe(p, end, ciphertext_len, e_inval);
ceph_decode_need(p, end, ciphertext_len, e_inval);
- ret = ceph_crypt(secret, false, *p, end - *p, ciphertext_len,
- &plaintext_len);
- if (ret)
+ ret = __ceph_x_decrypt(secret, *p, ciphertext_len);
+ if (ret < 0)
return ret;
- if (hdr->struct_v != 1 || le64_to_cpu(hdr->magic) != CEPHX_ENC_MAGIC)
- return -EPERM;
-
*p += ciphertext_len;
- return plaintext_len - sizeof(struct ceph_x_encrypt_header);
+ return ret;
e_inval:
return -EINVAL;
