cifs: consolidate signature generating code

We have two versions of signature generating code. A vectorized and
non-vectorized version. Eliminate a large chunk of cut-and-paste
code by turning the non-vectorized version into a wrapper around the
vectorized one.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>

1 files changed, 21 insertions, 82 deletions

diff --git a/fs/cifs/cifsencrypt.c b/fs/cifs/cifsencrypt.c
index 12f1c1263013..2cfb695d1f89 100644
--- a/fs/cifs/cifsencrypt.c
+++ b/fs/cifs/cifsencrypt.c
@@ -37,83 +37,8 @@
  * the sequence number before this function is called. Also, this function
  * should be called with the server->srv_mutex held.
  */
-static int cifs_calculate_signature(const struct smb_hdr *cifs_pdu,
-                                struct TCP_Server_Info *server, char *signature)
-{
-        int rc;
-
-        if (cifs_pdu == NULL || signature == NULL || server == NULL)
-                return -EINVAL;
-
-        if (!server->secmech.sdescmd5) {
-                cERROR(1, "%s: Can't generate signature\n", __func__);
-                return -1;
-        }
-
-        rc = crypto_shash_init(&server->secmech.sdescmd5->shash);
-        if (rc) {
-                cERROR(1, "%s: Could not init md5\n", __func__);
-                return rc;
-        }
-
-        rc = crypto_shash_update(&server->secmech.sdescmd5->shash,
-                server->session_key.response, server->session_key.len);
-        if (rc) {
-                cERROR(1, "%s: Could not update with response\n", __func__);
-                return rc;
-        }
-
-        rc = crypto_shash_update(&server->secmech.sdescmd5->shash,
-                cifs_pdu->Protocol, be32_to_cpu(cifs_pdu->smb_buf_length));
-        if (rc) {
-                cERROR(1, "%s: Could not update with payload\n", __func__);
-                return rc;
-        }
-
-        rc = crypto_shash_final(&server->secmech.sdescmd5->shash, signature);
-        if (rc)
-                cERROR(1, "%s: Could not generate md5 hash\n", __func__);
-
-        return rc;
-}
-
-/* must be called with server->srv_mutex held */
-int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server,
-                  __u32 *pexpected_response_sequence_number)
-{
-        int rc = 0;
-        char smb_signature[20];
-
-        if ((cifs_pdu == NULL) || (server == NULL))
-                return -EINVAL;
-
-        if (!(cifs_pdu->Flags2 & SMBFLG2_SECURITY_SIGNATURE) ||
-            server->tcpStatus == CifsNeedNegotiate)
-                return rc;
-
-        if (!server->session_estab) {
-                memcpy(cifs_pdu->Signature.SecuritySignature, "BSRSPYL", 8);
-                return rc;
-        }
-
-        cifs_pdu->Signature.Sequence.SequenceNumber =
-                        cpu_to_le32(server->sequence_number);
-        cifs_pdu->Signature.Sequence.Reserved = 0;
-
-        *pexpected_response_sequence_number = server->sequence_number++;
-        server->sequence_number++;
-
-        rc = cifs_calculate_signature(cifs_pdu, server, smb_signature);
-        if (rc)
-                memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
-        else
-                memcpy(cifs_pdu->Signature.SecuritySignature, smb_signature, 8);
-
-        return rc;
-}
-
-static int cifs_calc_signature2(const struct kvec *iov, int n_vec,
-                                struct TCP_Server_Info *server, char *signature)
+static int cifs_calc_signature(const struct kvec *iov, int n_vec,
+                        struct TCP_Server_Info *server, char *signature)
 {
         int i;
         int rc;
@@ -179,7 +104,7 @@ int cifs_sign_smb2(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
 {
         int rc = 0;
         char smb_signature[20];
-        struct smb_hdr *cifs_pdu = iov[0].iov_base;
+        struct smb_hdr *cifs_pdu = (struct smb_hdr *)iov[0].iov_base;
 
         if ((cifs_pdu == NULL) || (server == NULL))
                 return -EINVAL;
@@ -200,7 +125,7 @@ int cifs_sign_smb2(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
         *pexpected_response_sequence_number = server->sequence_number++;
         server->sequence_number++;
 
-        rc = cifs_calc_signature2(iov, n_vec, server, smb_signature);
+        rc = cifs_calc_signature(iov, n_vec, server, smb_signature);
         if (rc)
                 memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
         else
@@ -209,13 +134,27 @@ int cifs_sign_smb2(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
         return rc;
 }
 
-int cifs_verify_signature(struct smb_hdr *cifs_pdu,
+/* must be called with server->srv_mutex held */
+int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server,
+                  __u32 *pexpected_response_sequence_number)
+{
+        struct kvec iov;
+
+        iov.iov_base = cifs_pdu;
+        iov.iov_len = be32_to_cpu(cifs_pdu->smb_buf_length) + 4;
+
+        return cifs_sign_smb2(&iov, 1, server,
+                              pexpected_response_sequence_number);
+}
+
+int cifs_verify_signature(struct kvec *iov, unsigned int nr_iov,
                           struct TCP_Server_Info *server,
                           __u32 expected_sequence_number)
 {
         unsigned int rc;
         char server_response_sig[8];
         char what_we_think_sig_should_be[20];
+        struct smb_hdr *cifs_pdu = (struct smb_hdr *)iov[0].iov_base;
 
         if (cifs_pdu == NULL || server == NULL)
                 return -EINVAL;
@@ -247,8 +186,8 @@ int cifs_verify_signature(struct smb_hdr *cifs_pdu,
         cifs_pdu->Signature.Sequence.Reserved = 0;
 
         mutex_lock(&server->srv_mutex);
-        rc = cifs_calculate_signature(cifs_pdu, server,
-                what_we_think_sig_should_be);
+        rc = cifs_calc_signature(iov, nr_iov, server,
+                                 what_we_think_sig_should_be);
         mutex_unlock(&server->srv_mutex);
 
         if (rc)