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

1 files changed, 85 insertions, 10 deletions

diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index f00369277c06..da3154fa9c8a 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -44,8 +44,11 @@ static struct {
         int index;
         char *name;
 } protocols[] = {
+#ifdef CONFIG_CIFS_WEAK_PW_HASH
+        {LANMAN_PROT, "\2LM1.2X002"},
+#endif /* weak password hashing for legacy clients */
         {CIFS_PROT, "\2NT LM 0.12"}, 
-        {CIFS_PROT, "\2POSIX 2"},
+        {POSIX_PROT, "\2POSIX 2"},
         {BAD_PROT, "\2"}
 };
 #else
@@ -53,11 +56,29 @@ static struct {
         int index;
         char *name;
 } protocols[] = {
+#ifdef CONFIG_CIFS_WEAK_PW_HASH
+        {LANMAN_PROT, "\2LM1.2X002"},
+#endif /* weak password hashing for legacy clients */
         {CIFS_PROT, "\2NT LM 0.12"}, 
         {BAD_PROT, "\2"}
 };
 #endif
 
+/* define the number of elements in the cifs dialect array */
+#ifdef CONFIG_CIFS_POSIX
+#ifdef CONFIG_CIFS_WEAK_PW_HASH
+#define CIFS_NUM_PROT 3
+#else
+#define CIFS_NUM_PROT 2
+#endif /* CIFS_WEAK_PW_HASH */
+#else /* not posix */
+#ifdef CONFIG_CIFS_WEAK_PW_HASH
+#define CIFS_NUM_PROT 2
+#else
+#define CIFS_NUM_PROT 1
+#endif /* CONFIG_CIFS_WEAK_PW_HASH */
+#endif /* CIFS_POSIX */
+
 
 /* Mark as invalid, all open files on tree connections since they
    were closed when session to server was lost */
@@ -322,7 +343,8 @@ smb_init(int smb_command, int wct, struct cifsTconInfo *tcon,
     /* potential retries of smb operations it turns out we can determine */
     /* from the mid flags when the request buffer can be resent without  */
     /* having to use a second distinct buffer for the response */
-        *response_buf = *request_buf; 
+        if(response_buf)
+                *response_buf = *request_buf; 
 
         header_assemble((struct smb_hdr *) *request_buf, smb_command, tcon,
                         wct /*wct */ );
@@ -373,6 +395,7 @@ CIFSSMBNegotiate(unsigned int xid, struct cifsSesInfo *ses)
         NEGOTIATE_RSP *pSMBr;
         int rc = 0;
         int bytes_returned;
+        int i;
         struct TCP_Server_Info * server;
         u16 count;
 
@@ -388,19 +411,71 @@ CIFSSMBNegotiate(unsigned int xid, struct cifsSesInfo *ses)
                 return rc;
         pSMB->hdr.Mid = GetNextMid(server);
         pSMB->hdr.Flags2 |= SMBFLG2_UNICODE;
-        if (extended_security)
-                pSMB->hdr.Flags2 |= SMBFLG2_EXT_SEC;
-
-        count = strlen(protocols[0].name) + 1;
-        strncpy(pSMB->DialectsArray, protocols[0].name, 30);    
-    /* null guaranteed to be at end of source and target buffers anyway */
-
+/*      if (extended_security)
+                pSMB->hdr.Flags2 |= SMBFLG2_EXT_SEC;*/
+        
+        count = 0;
+        for(i=0;i<CIFS_NUM_PROT;i++) {
+                strncpy(pSMB->DialectsArray+count, protocols[i].name, 16);
+                count += strlen(protocols[i].name) + 1;
+                /* null at end of source and target buffers anyway */
+        }
         pSMB->hdr.smb_buf_length += count;
         pSMB->ByteCount = cpu_to_le16(count);
 
         rc = SendReceive(xid, ses, (struct smb_hdr *) pSMB,
                          (struct smb_hdr *) pSMBr, &bytes_returned, 0);
         if (rc == 0) {
+                cFYI(1,("Dialect: %d", pSMBr->DialectIndex));
+                /* Check wct = 1 error case */
+                if((pSMBr->hdr.WordCount < 13)  
+                        || (pSMBr->DialectIndex == BAD_PROT)) {
+                        /* core returns wct = 1, but we do not ask for
+                        core - otherwise it just comes when dialect
+                        index is -1 indicating we could not negotiate
+                        a common dialect */
+                        rc = -EOPNOTSUPP;
+                        goto neg_err_exit;
+                } else if((pSMBr->hdr.WordCount == 13) && 
+                        (pSMBr->DialectIndex == LANMAN_PROT)) {
+                        struct lanman_neg_rsp * rsp = 
+                                (struct lanman_neg_rsp *)pSMBr;
+
+
+                        /* BB Mark ses struct as negotiated lanman level BB */
+                        server->secType = LANMAN;
+                        server->secMode = (__u8)le16_to_cpu(rsp->SecurityMode);
+                        server->maxReq = le16_to_cpu(rsp->MaxMpxCount);
+                        server->maxBuf = min((__u32)le16_to_cpu(rsp->MaxBufSize),
+                                (__u32)CIFSMaxBufSize + MAX_CIFS_HDR_SIZE);
+
+                        /* BB what do we do with raw mode? BB */
+                        server->timeZone = le16_to_cpu(rsp->ServerTimeZone);
+                        /* Do we have to set signing flags? no signing
+                        was available LANMAN - default should be ok */
+
+                        /* BB FIXME set default dummy capabilities since
+                        they are not returned by the server in this dialect */
+
+                        /* get server time for time conversions and add
+                        code to use it and timezone since this is not UTC */    
+
+                        if (rsp->EncryptionKeyLength == CIFS_CRYPTO_KEY_SIZE) {
+                                memcpy(server->cryptKey, rsp->EncryptionKey,
+                                        CIFS_CRYPTO_KEY_SIZE);
+                        } else {
+                                rc = -EIO;
+                                goto neg_err_exit;
+                        }
+
+                        cFYI(1,("LANMAN negotiated")); /* BB removeme BB */
+                        goto neg_err_exit;
+                } else if(pSMBr->hdr.WordCount != 17) {
+                        /* unknown wct */
+                        rc = -EOPNOTSUPP;
+                        goto neg_err_exit;
+                }
+
                 server->secMode = pSMBr->SecurityMode;
                 if((server->secMode & SECMODE_USER) == 0)
                         cFYI(1,("share mode security"));
@@ -479,7 +554,7 @@ CIFSSMBNegotiate(unsigned int xid, struct cifsSesInfo *ses)
                 }
                                 
         }
-        
+neg_err_exit:   
         cifs_buf_release(pSMB);
         return rc;
 }