[CIFS] Fix sign mount option and sign proc config setting

We were checking the wrong (old) global variable to determine
whether to override server and force signing on the SMB
connection.

Acked-by: Dave Kleikamp <shaggy@austin.ibm.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

1 files changed, 21 insertions, 11 deletions

diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index 57419a176688..4a2458e78784 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -426,11 +426,11 @@ CIFSSMBNegotiate(unsigned int xid, struct cifsSesInfo *ses)
 
         /* if any of auth flags (ie not sign or seal) are overriden use them */
         if(ses->overrideSecFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL)))
-                secFlags = ses->overrideSecFlg;
+                secFlags = ses->overrideSecFlg;  /* BB FIXME fix sign flags? */
         else /* if override flags set only sign/seal OR them with global auth */
                 secFlags = extended_security | ses->overrideSecFlg;
 
-        cFYI(1,("secFlags 0x%x",secFlags));
+        cFYI(1, ("secFlags 0x%x", secFlags));
 
         pSMB->hdr.Mid = GetNextMid(server);
         pSMB->hdr.Flags2 |= (SMBFLG2_UNICODE | SMBFLG2_ERR_STATUS);
@@ -633,22 +633,32 @@ CIFSSMBNegotiate(unsigned int xid, struct cifsSesInfo *ses)
 #ifdef CONFIG_CIFS_WEAK_PW_HASH
 signing_check:
 #endif
-        if(sign_CIFS_PDUs == FALSE) {        
+        if ((secFlags & CIFSSEC_MAY_SIGN) == 0) {
+                /* MUST_SIGN already includes the MAY_SIGN FLAG
+                   so if this is zero it means that signing is disabled */
+                cFYI(1, ("Signing disabled"));
                 if(server->secMode & SECMODE_SIGN_REQUIRED)
-                        cERROR(1,("Server requires "
-                                 "/proc/fs/cifs/PacketSigningEnabled to be on"));
+                        cERROR(1, ("Server requires "
+                                   "/proc/fs/cifs/PacketSigningEnabled "
+                                   "to be on"));
                 server->secMode &= 
                         ~(SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED);
-        } else if(sign_CIFS_PDUs == 1) {
+        } else if ((secFlags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN) {
+                /* signing required */
+                cFYI(1, ("Must sign - segFlags 0x%x", secFlags));
+                if ((server->secMode &
+                        (SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED)) == 0) {
+                        cERROR(1,
+                                ("signing required but server lacks support"));
+                } else
+                        server->secMode |= SECMODE_SIGN_REQUIRED;
+        } else {
+                /* signing optional ie CIFSSEC_MAY_SIGN */
                 if((server->secMode & SECMODE_SIGN_REQUIRED) == 0)
                         server->secMode &= 
                                 ~(SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED);
-        } else if(sign_CIFS_PDUs == 2) {
-                if((server->secMode & 
-                        (SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED)) == 0) {
-                        cERROR(1,("signing required but server lacks support"));
-                }
         }
+        
 neg_err_exit:   
         cifs_buf_release(pSMB);