[CIFS] Fix packet signatures for NTLMv2 case

Signed-off-by: Yehuda Sadeh Weinraub <Yehuda.Sadeh@expand.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

8 files changed, 71 insertions, 36 deletions

diff --git a/fs/cifs/CHANGES b/fs/cifs/CHANGES
index 258130eea9e7..ee276f62bcf4 100644
--- a/fs/cifs/CHANGES
+++ b/fs/cifs/CHANGES
@@ -1,3 +1,7 @@
+Version 1.50
+------------
+Fix NTLMv2 signing
+
 Version 1.49
 ------------
 IPv6 support.  Enable ipv6 addresses to be passed on mount (put the ipv6
diff --git a/fs/cifs/TODO b/fs/cifs/TODO
index d57dc2917d04..d7bd51575fd6 100644
--- a/fs/cifs/TODO
+++ b/fs/cifs/TODO
@@ -18,9 +18,9 @@ better)
 
 d) Kerberos/SPNEGO session setup support - (started)
 
-e) More testing of NTLMv2 authentication (mostly implemented - double check
-that NTLMv2 signing works, also need to cleanup now unneeded SessSetup code in
-fs/cifs/connect.c)
+e) Cleanup now unneeded SessSetup code in
+fs/cifs/connect.c and add back in NTLMSSP code if any servers
+need it
 
 f) MD5-HMAC signing SMB PDUs when SPNEGO style SessionSetup 
 used (Kerberos or NTLMSSP). Signing alreadyimplemented for NTLM
diff --git a/fs/cifs/cifsencrypt.c b/fs/cifs/cifsencrypt.c
index 8422df81b994..860dc49ba79c 100644
--- a/fs/cifs/cifsencrypt.c
+++ b/fs/cifs/cifsencrypt.c
@@ -41,16 +41,17 @@ extern void SMBencrypt(unsigned char *passwd, unsigned char *c8,
                        unsigned char *p24);
         
 static int cifs_calculate_signature(const struct smb_hdr *cifs_pdu,
-                                    const char *key, char *signature)
+                                    const struct mac_key *key, char *signature)
 {
         struct  MD5Context context;
 
-        if ((cifs_pdu == NULL) || (signature == NULL))
+        if ((cifs_pdu == NULL) || (signature == NULL) || (key == NULL))
                 return -EINVAL;
 
         MD5Init(&context);
-        MD5Update(&context, key, CIFS_SESS_KEY_SIZE+16);
+        MD5Update(&context, (char *)&key->data, key->len);
         MD5Update(&context, cifs_pdu->Protocol, cifs_pdu->smb_buf_length);
+
         MD5Final(signature, &context);
         return 0;
 }
@@ -76,7 +77,7 @@ int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server,
         server->sequence_number++;
         spin_unlock(&GlobalMid_Lock);
 
-        rc = cifs_calculate_signature(cifs_pdu, server->mac_signing_key,
+        rc = cifs_calculate_signature(cifs_pdu, &server->mac_signing_key,
                                       smb_signature);
         if (rc)
                 memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
@@ -87,16 +88,16 @@ int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server,
 }
 
 static int cifs_calc_signature2(const struct kvec *iov, int n_vec,
-                                const char *key, char *signature)
+                                const struct mac_key *key, char *signature)
 {
         struct  MD5Context context;
         int i;
 
-        if ((iov == NULL) || (signature == NULL))
+        if ((iov == NULL) || (signature == NULL) || (key == NULL))
                 return -EINVAL;
 
         MD5Init(&context);
-        MD5Update(&context, key, CIFS_SESS_KEY_SIZE+16);
+        MD5Update(&context, (char *)&key->data, key->len);
         for (i=0;i<n_vec;i++) {
                 if (iov[i].iov_base == NULL) {
                         cERROR(1 ,("null iovec entry"));
@@ -141,7 +142,7 @@ int cifs_sign_smb2(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
         server->sequence_number++;
         spin_unlock(&GlobalMid_Lock);
 
-        rc = cifs_calc_signature2(iov, n_vec, server->mac_signing_key,
+        rc = cifs_calc_signature2(iov, n_vec, &server->mac_signing_key,
                                       smb_signature);
         if (rc)
                 memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
@@ -151,7 +152,8 @@ 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, const char *mac_key,
+int cifs_verify_signature(struct smb_hdr *cifs_pdu,
+                          const struct mac_key *mac_key,
                           __u32 expected_sequence_number)
 {
         unsigned int rc;
@@ -202,15 +204,17 @@ int cifs_verify_signature(struct smb_hdr *cifs_pdu, const char *mac_key,
 }
 
 /* We fill in key by putting in 40 byte array which was allocated by caller */
-int cifs_calculate_mac_key(char * key, const char * rn, const char * password)
+int cifs_calculate_mac_key(struct mac_key *key, const char *rn,
+                           const char *password)
 {
         char temp_key[16];
         if ((key == NULL) || (rn == NULL))
                 return -EINVAL;
 
         E_md4hash(password, temp_key);
-        mdfour(key,temp_key,16);
-        memcpy(key+16,rn, CIFS_SESS_KEY_SIZE);
+        mdfour(key->data.ntlm, temp_key, 16);
+        memcpy(key->data.ntlm+16, rn, CIFS_SESS_KEY_SIZE);
+        key->len = 40;
         return 0;
 }
 
@@ -235,35 +239,35 @@ int CalcNTLMv2_partial_mac_key(struct cifsSesInfo * ses,
         if(ses->domainName == NULL)
                 return -EINVAL; /* BB should we use CIFS_LINUX_DOM */
         dom_name_len = strlen(ses->domainName);
-        if(dom_name_len > MAX_USERNAME_SIZE)
+        if (dom_name_len > MAX_USERNAME_SIZE)
                 return -EINVAL;
   
         ucase_buf = kmalloc((MAX_USERNAME_SIZE+1), GFP_KERNEL);
-        if(ucase_buf == NULL)
+        if (ucase_buf == NULL)
                 return -ENOMEM;
         unicode_buf = kmalloc((MAX_USERNAME_SIZE+1)*4, GFP_KERNEL);
-        if(unicode_buf == NULL) {
+        if (unicode_buf == NULL) {
                 kfree(ucase_buf);
                 return -ENOMEM;
         }
    
-        for(i=0;i<user_name_len;i++)
+        for (i = 0;i < user_name_len; i++)
                 ucase_buf[i] = nls_info->charset2upper[(int)ses->userName[i]];
         ucase_buf[i] = 0;
         user_name_len = cifs_strtoUCS(unicode_buf, ucase_buf, MAX_USERNAME_SIZE*2, nls_info);
         unicode_buf[user_name_len] = 0;
         user_name_len++;
 
-        for(i=0;i<dom_name_len;i++)
+        for (i = 0; i < dom_name_len; i++)
                 ucase_buf[i] = nls_info->charset2upper[(int)ses->domainName[i]];
         ucase_buf[i] = 0;
         dom_name_len = cifs_strtoUCS(unicode_buf+user_name_len, ucase_buf, MAX_USERNAME_SIZE*2, nls_info);
 
         unicode_buf[user_name_len + dom_name_len] = 0;
         hmac_md5_update((const unsigned char *) unicode_buf,
-                (user_name_len+dom_name_len)*2,&ctx);
+                (user_name_len+dom_name_len)*2, &ctx);
 
-        hmac_md5_final(ses->server->mac_signing_key,&ctx);
+        hmac_md5_final(ses->server->ntlmv2_hash, &ctx);
         kfree(ucase_buf);
         kfree(unicode_buf);
         return 0;
@@ -347,7 +351,10 @@ static int calc_ntlmv2_hash(struct cifsSesInfo *ses,
                 if(domain == NULL)
                         goto calc_exit_1;
                 len = cifs_strtoUCS(domain, ses->domainName, len, nls_cp);
-                UniStrupr(domain);
+                /* the following line was removed since it didn't work well
+                   with lower cased domain name that passed as an option.
+                   Maybe converting the domain name earlier makes sense */
+                /* UniStrupr(domain); */
 
                 hmac_md5_update((char *)domain, 2*len, pctxt);
         
@@ -358,7 +365,7 @@ calc_exit_1:
 calc_exit_2:
         /* BB FIXME what about bytes 24 through 40 of the signing key? 
            compare with the NTLM example */
-        hmac_md5_final(ses->server->mac_signing_key, pctxt);
+        hmac_md5_final(ses->server->ntlmv2_hash, pctxt);
 
         return rc;
 }
@@ -368,6 +375,7 @@ void setup_ntlmv2_rsp(struct cifsSesInfo * ses, char * resp_buf,
 {
         int rc;
         struct ntlmv2_resp * buf = (struct ntlmv2_resp *)resp_buf;
+        struct HMACMD5Context context;
 
         buf->blob_signature = cpu_to_le32(0x00000101);
         buf->reserved = 0;
@@ -384,6 +392,15 @@ void setup_ntlmv2_rsp(struct cifsSesInfo * ses, char * resp_buf,
         if(rc)
                 cERROR(1,("could not get v2 hash rc %d",rc));
         CalcNTLMv2_response(ses, resp_buf);
+
+        /* now calculate the MAC key for NTLMv2 */
+        hmac_md5_init_limK_to_64(ses->server->ntlmv2_hash, 16, &context);
+        hmac_md5_update(resp_buf, 16, &context);
+        hmac_md5_final(ses->server->mac_signing_key.data.ntlmv2.key, &context);
+
+        memcpy(&ses->server->mac_signing_key.data.ntlmv2.resp, resp_buf,
+               sizeof(struct ntlmv2_resp));
+        ses->server->mac_signing_key.len = 16 + sizeof(struct ntlmv2_resp);
 }
 
 void CalcNTLMv2_response(const struct cifsSesInfo * ses, char * v2_session_response)
@@ -391,9 +408,9 @@ void CalcNTLMv2_response(const struct cifsSesInfo * ses, char * v2_session_respo
         struct HMACMD5Context context;
         /* rest of v2 struct already generated */
         memcpy(v2_session_response + 8, ses->server->cryptKey,8);
-        hmac_md5_init_limK_to_64(ses->server->mac_signing_key, 16, &context);
+        hmac_md5_init_limK_to_64(ses->server->ntlmv2_hash, 16, &context);
 
-        hmac_md5_update(v2_session_response+8, 
+        hmac_md5_update(v2_session_response+8,
                         sizeof(struct ntlmv2_resp) - 8, &context);
 
         hmac_md5_final(v2_session_response,&context);
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index e16a2c473003..0a7813175a27 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -104,6 +104,17 @@ enum protocolEnum {
         /* Netbios frames protocol not supported at this time */
 };
 
+struct mac_key {
+        unsigned int len;
+        union {
+                char ntlm[CIFS_SESS_KEY_SIZE + 16];
+                struct {
+                        char key[16];
+                        struct ntlmv2_resp resp;
+                } ntlmv2;
+        } data;
+};
+
 /*
  *****************************************************************
  * Except the CIFS PDUs themselves all the
@@ -159,7 +170,8 @@ struct TCP_Server_Info {
         /* 16th byte of RFC1001 workstation name is always null */
         char workstation_RFC1001_name[SERVER_NAME_LEN_WITH_NULL];
         __u32 sequence_number; /* needed for CIFS PDU signature */
-        char mac_signing_key[CIFS_SESS_KEY_SIZE + 16];
+        struct mac_key mac_signing_key;
+        char ntlmv2_hash[16];
         unsigned long lstrp; /* when we got last response from this server */
 };
 
diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index 4a89f038af28..6a6e3f9f3f8b 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -294,9 +294,11 @@ extern void tconInfoFree(struct cifsTconInfo *);
 extern int cifs_sign_smb(struct smb_hdr *, struct TCP_Server_Info *, __u32 *);
 extern int cifs_sign_smb2(struct kvec *iov, int n_vec, struct TCP_Server_Info *,
                           __u32 *);
-extern int cifs_verify_signature(struct smb_hdr *, const char *mac_key,
-        __u32 expected_sequence_number);
-extern int cifs_calculate_mac_key(char *key, const char *rn, const char *pass);
+extern int cifs_verify_signature(struct smb_hdr *,
+                                 const struct mac_key *mac_key,
+                                __u32 expected_sequence_number);
+extern int cifs_calculate_mac_key(struct mac_key *key, const char *rn,
+                                 const char *pass);
 extern int CalcNTLMv2_partial_mac_key(struct cifsSesInfo *,
                         const struct nls_table *);
 extern void CalcNTLMv2_response(const struct cifsSesInfo *, char * );
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 8f436ef24368..9b95d4637fcc 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -3475,7 +3475,7 @@ int cifs_setup_session(unsigned int xid, struct cifsSesInfo *pSesInfo,
 
                                         if(first_time)
                                                 cifs_calculate_mac_key(
-                                                        pSesInfo->server->mac_signing_key,
+                                                        &pSesInfo->server->mac_signing_key,
                                                         ntlm_session_key,
                                                         pSesInfo->password);
                                 }
@@ -3495,7 +3495,7 @@ int cifs_setup_session(unsigned int xid, struct cifsSesInfo *pSesInfo,
 
                         if(first_time)          
                                 cifs_calculate_mac_key(
-                                        pSesInfo->server->mac_signing_key,
+                                        &pSesInfo->server->mac_signing_key,
                                         ntlm_session_key, pSesInfo->password);
 
                         rc = CIFSSessSetup(xid, pSesInfo,
diff --git a/fs/cifs/sess.c b/fs/cifs/sess.c
index b3f9d40d06db..f45c4730e92e 100644
--- a/fs/cifs/sess.c
+++ b/fs/cifs/sess.c
@@ -419,7 +419,7 @@ CIFS_SessSetup(unsigned int xid, struct cifsSesInfo *ses, int first_time,
 
                 if (first_time) /* should this be moved into common code
                                   with similar ntlmv2 path? */
-                        cifs_calculate_mac_key(ses->server->mac_signing_key,
+                        cifs_calculate_mac_key(&ses->server->mac_signing_key,
                                 ntlm_session_key, ses->password);
                 /* copy session key */
 
diff --git a/fs/cifs/transport.c b/fs/cifs/transport.c
index 01b589163bd8..f9ebe70ecc4d 100644
--- a/fs/cifs/transport.c
+++ b/fs/cifs/transport.c
@@ -559,7 +559,7 @@ SendReceive2(const unsigned int xid, struct cifsSesInfo *ses,
                            (ses->server->secMode & (SECMODE_SIGN_REQUIRED |
                                         SECMODE_SIGN_ENABLED))) {
                                 rc = cifs_verify_signature(midQ->resp_buf,
-                                                ses->server->mac_signing_key,
+                                                &ses->server->mac_signing_key,
                                                 midQ->sequence_number+1);
                                 if (rc) {
                                         cERROR(1, ("Unexpected SMB signature"));
@@ -738,7 +738,7 @@ SendReceive(const unsigned int xid, struct cifsSesInfo *ses,
                            (ses->server->secMode & (SECMODE_SIGN_REQUIRED |
                                         SECMODE_SIGN_ENABLED))) {
                                 rc = cifs_verify_signature(out_buf,
-                                                ses->server->mac_signing_key,
+                                                &ses->server->mac_signing_key,
                                                 midQ->sequence_number+1);
                                 if (rc) {
                                         cERROR(1, ("Unexpected SMB signature"));
@@ -982,7 +982,7 @@ SendReceiveBlockingLock(const unsigned int xid, struct cifsTconInfo *tcon,
                            (ses->server->secMode & (SECMODE_SIGN_REQUIRED |
                                         SECMODE_SIGN_ENABLED))) {
                                 rc = cifs_verify_signature(out_buf,
-                                                ses->server->mac_signing_key,
+                                                &ses->server->mac_signing_key,
                                                 midQ->sequence_number+1);
                                 if (rc) {
                                         cERROR(1, ("Unexpected SMB signature"));