cifs: have calc_lanman_hash take more granular args

cifs: have calc_lanman_hash take more granular args

We need to use this routine to encrypt passwords associated with the
tcon too. Don't assume that the password will be attached to the
smb_session.

Also, make some of the values in the lower encryption functions
const since they aren't changed.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

1 files changed, 14 insertions, 16 deletions

diff --git a/fs/cifs/cifsencrypt.c b/fs/cifs/cifsencrypt.c
index bd5f13d38450..d4839cf0cb2c 100644
--- a/fs/cifs/cifsencrypt.c
+++ b/fs/cifs/cifsencrypt.c
@@ -37,7 +37,7 @@
 
 extern void mdfour(unsigned char *out, unsigned char *in, int n);
 extern void E_md4hash(const unsigned char *passwd, unsigned char *p16);
-extern void SMBencrypt(unsigned char *passwd, unsigned char *c8,
+extern void SMBencrypt(unsigned char *passwd, const unsigned char *c8,
                        unsigned char *p24);
 
 static int cifs_calculate_signature(const struct smb_hdr *cifs_pdu,
@@ -280,25 +280,22 @@ int CalcNTLMv2_partial_mac_key(struct cifsSesInfo *ses,
 }
 
 #ifdef CONFIG_CIFS_WEAK_PW_HASH
-void calc_lanman_hash(struct cifsSesInfo *ses, char *lnm_session_key)
+void calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt,
+                        char *lnm_session_key)
 {
         int i;
         char password_with_pad[CIFS_ENCPWD_SIZE];
 
-        if (ses->server == NULL)
-                return;
-
         memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
-        if (ses->password)
-                strncpy(password_with_pad, ses->password, CIFS_ENCPWD_SIZE);
-
-        if ((ses->server->secMode & SECMODE_PW_ENCRYPT) == 0)
-                if (extended_security & CIFSSEC_MAY_PLNTXT) {
-                        memset(lnm_session_key, 0, CIFS_SESS_KEY_SIZE);
-                        memcpy(lnm_session_key, password_with_pad,
-                                CIFS_ENCPWD_SIZE);
-                        return;
-                }
+        if (password)
+                strncpy(password_with_pad, password, CIFS_ENCPWD_SIZE);
+
+        if (!encrypt && extended_security & CIFSSEC_MAY_PLNTXT) {
+                memset(lnm_session_key, 0, CIFS_SESS_KEY_SIZE);
+                memcpy(lnm_session_key, password_with_pad,
+                        CIFS_ENCPWD_SIZE);
+                return;
+        }
 
         /* calculate old style session key */
         /* calling toupper is less broken than repeatedly
@@ -314,7 +311,8 @@ void calc_lanman_hash(struct cifsSesInfo *ses, char *lnm_session_key)
         for (i = 0; i < CIFS_ENCPWD_SIZE; i++)
                 password_with_pad[i] = toupper(password_with_pad[i]);
 
-        SMBencrypt(password_with_pad, ses->server->cryptKey, lnm_session_key);
+        SMBencrypt(password_with_pad, cryptkey, lnm_session_key);
+
         /* clear password before we return/free memory */
         memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
 }