[CIFS] Support for setting up SMB sessions to legacy lanman servers part 2

1 files changed, 22 insertions, 5 deletions

diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index da3154fa9c8a..6b5be6d59f07 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -438,12 +438,19 @@ CIFSSMBNegotiate(unsigned int xid, struct cifsSesInfo *ses)
                         goto neg_err_exit;
                 } else if((pSMBr->hdr.WordCount == 13) && 
                         (pSMBr->DialectIndex == LANMAN_PROT)) {
+#ifdef CONFIG_CIFS_WEAK_PW_HASH
                         struct lanman_neg_rsp * rsp = 
                                 (struct lanman_neg_rsp *)pSMBr;
 
-
-                        /* BB Mark ses struct as negotiated lanman level BB */
-                        server->secType = LANMAN;
+                        if((extended_security & CIFSSEC_MAY_LANMAN) || 
+                                (extended_security & CIFSSEC_MAY_PLNTXT))
+                                server->secType = LANMAN;
+                        else {
+                                cERROR(1, ("mount failed weak security disabled"
+                                        " in /proc/fs/cifs/SecurityFlags"));
+                                rc = -EOPNOTSUPP;
+                                goto neg_err_exit;
+                        }       
                         server->secMode = (__u8)le16_to_cpu(rsp->SecurityMode);
                         server->maxReq = le16_to_cpu(rsp->MaxMpxCount);
                         server->maxBuf = min((__u32)le16_to_cpu(rsp->MaxBufSize),
@@ -469,6 +476,11 @@ CIFSSMBNegotiate(unsigned int xid, struct cifsSesInfo *ses)
                         }
 
                         cFYI(1,("LANMAN negotiated")); /* BB removeme BB */
+#else /* weak security disabled */
+                        cERROR(1,("mount failed, cifs module not built with "
+                                "CIFS_WEAK_PW_HASH support"));
+                        rc = -EOPNOTSUPP;
+#endif /* WEAK_PW_HASH */
                         goto neg_err_exit;
                 } else if(pSMBr->hdr.WordCount != 17) {
                         /* unknown wct */
@@ -479,8 +491,13 @@ CIFSSMBNegotiate(unsigned int xid, struct cifsSesInfo *ses)
                 server->secMode = pSMBr->SecurityMode;
                 if((server->secMode & SECMODE_USER) == 0)
                         cFYI(1,("share mode security"));
-                server->secType = NTLM; /* BB override default for
-                                           NTLMv2 or kerberos v5 */
+                
+                if(extended_security & CIFSSEC_MUST_NTLMV2)
+                        server->secType = NTLMv2;
+                else
+                        server->secType = NTLM;
+                /* else krb5 ... */
+
                 /* one byte - no need to convert this or EncryptionKeyLen
                    from little endian */
                 server->maxReq = le16_to_cpu(pSMBr->MaxMpxCount);