[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>
diff --git a/fs/cifs/CHANGES b/fs/cifs/CHANGES
index 258130e..ee276f6 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 d57dc29..d7bd515 100644
--- a/fs/cifs/TODO
+++ b/fs/cifs/TODO
@@ -18,9 +18,9 @@
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 8422df8..860dc49b 100644
--- a/fs/cifs/cifsencrypt.c
+++ b/fs/cifs/cifsencrypt.c
@@ -41,16 +41,17 @@
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 @@
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 @@
}
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 @@
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 @@
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 @@
}
/* 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 @@
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 @@
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_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 @@
{
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 @@
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 @@
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 e16a2c4..0a78131 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -104,6 +104,17 @@
/* 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 @@
/* 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 4a89f03..6a6e3f9 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -294,9 +294,11 @@
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 8f436ef..9b95d46 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -3475,7 +3475,7 @@
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 @@
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 b3f9d40..f45c473 100644
--- a/fs/cifs/sess.c
+++ b/fs/cifs/sess.c
@@ -419,7 +419,7 @@
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 01b5891..f9ebe70 100644
--- a/fs/cifs/transport.c
+++ b/fs/cifs/transport.c
@@ -559,7 +559,7 @@
(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 @@
(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 @@
(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"));