[CIFS] NTLMv2 support part 5
NTLMv2 authentication (stronger authentication than default NTLM) which
many servers support now works. There was a problem with the construction
of the security blob in the older code. Currently requires
/proc/fs/cifs/Experimental to be set to 2
and
/proc/fs/cifs/SecurityFlags to be set to 0x4004 (to require using
NTLMv2 instead of default of NTLM)
Next we will check signing to make sure optional NTLMv2 packet signing also
works.
Signed-off-by: Steve French <sfrench@us.ibm.com>
diff --git a/fs/cifs/CHANGES b/fs/cifs/CHANGES
index 7e0058b..79a202b 100644
--- a/fs/cifs/CHANGES
+++ b/fs/cifs/CHANGES
@@ -5,7 +5,9 @@
Fix oops on ls to OS/2 servers. Add support for level 1 FindFirst
so we can do search (ls etc.) to OS/2. Do not send NTCreateX
or recent levels of FindFirst unless server says it supports NT SMBs
-(instead use legacy equivalents from LANMAN dialect).
+(instead use legacy equivalents from LANMAN dialect). Fix to allow
+NTLMv2 authentication support (now can use stronger password hashing
+on mount if corresponding /proc/fs/cifs/SecurityFlags is set (0x4004)
Version 1.43
------------
diff --git a/fs/cifs/cifsencrypt.c b/fs/cifs/cifsencrypt.c
index 8bcb1da..a89efaf 100644
--- a/fs/cifs/cifsencrypt.c
+++ b/fs/cifs/cifsencrypt.c
@@ -212,7 +212,8 @@
return 0;
}
-int CalcNTLMv2_partial_mac_key(struct cifsSesInfo * ses, struct nls_table * nls_info)
+int CalcNTLMv2_partial_mac_key(struct cifsSesInfo * ses,
+ const struct nls_table * nls_info)
{
char temp_hash[16];
struct HMACMD5Context ctx;
@@ -305,13 +306,15 @@
}
#endif /* CIFS_WEAK_PW_HASH */
-static int calc_ntlmv2_hash(const struct cifsSesInfo *ses,
- char * ntv2_hash)
+static int calc_ntlmv2_hash(struct cifsSesInfo *ses,
+ const struct nls_table * nls_cp)
{
int rc = 0;
int len;
char nt_hash[16];
struct HMACMD5Context * pctxt;
+ wchar_t * user;
+ wchar_t * domain;
pctxt = kmalloc(sizeof(struct HMACMD5Context), GFP_KERNEL);
@@ -321,26 +324,44 @@
/* calculate md4 hash of password */
E_md4hash(ses->password, nt_hash);
- /* convERT Domainname to unicode and uppercase */
+ /* convert Domainname to unicode and uppercase */
hmac_md5_init_limK_to_64(nt_hash, 16, pctxt);
/* convert ses->userName to unicode and uppercase */
-
- /* len = ... */ /* BB FIXME BB */
-
- /* hmac_md5_update(user, len, pctxt); */
+ len = strlen(ses->userName);
+ user = kmalloc(2 + (len * 2), GFP_KERNEL);
+ if(user == NULL)
+ goto calc_exit_2;
+ len = cifs_strtoUCS(user, ses->userName, len, nls_cp);
+ UniStrupr(user);
+ hmac_md5_update((char *)user, 2*len, pctxt);
/* convert ses->domainName to unicode and uppercase */
+ if(ses->domainName) {
+ len = strlen(ses->domainName);
- /* len = ... */ /* BB FIXME BB */
- /* hmac_md5_update(domain, len, pctxt); */
+ domain = kmalloc(2 + (len * 2), GFP_KERNEL);
+ if(domain == NULL)
+ goto calc_exit_1;
+ len = cifs_strtoUCS(domain, ses->domainName, len, nls_cp);
+ UniStrupr(domain);
- hmac_md5_final(ntv2_hash, pctxt);
+ hmac_md5_update((char *)domain, 2*len, pctxt);
+
+ kfree(domain);
+ }
+calc_exit_1:
+ kfree(user);
+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);
return rc;
}
-void setup_ntlmv2_rsp(const struct cifsSesInfo * ses, char * resp_buf)
+void setup_ntlmv2_rsp(struct cifsSesInfo * ses, char * resp_buf,
+ const struct nls_table * nls_cp)
{
int rc;
struct ntlmv2_resp * buf = (struct ntlmv2_resp *)resp_buf;
@@ -348,27 +369,28 @@
buf->blob_signature = cpu_to_le32(0x00000101);
buf->reserved = 0;
buf->time = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
- get_random_bytes(&buf->client_chal, sizeof(buf->client_chal));
+ get_random_bytes(&buf->client_chal, sizeof(buf->client_chal));
buf->reserved2 = 0;
buf->names[0].type = 0;
buf->names[0].length = 0;
/* calculate buf->ntlmv2_hash */
- rc = calc_ntlmv2_hash(ses,buf->ntlmv2_hash);
+ rc = calc_ntlmv2_hash(ses, nls_cp);
if(rc)
cERROR(1,("could not get v2 hash rc %d",rc));
+ CalcNTLMv2_response(ses, resp_buf);
}
-void CalcNTLMv2_response(const struct cifsSesInfo * ses,char * v2_session_response)
+void CalcNTLMv2_response(const struct cifsSesInfo * ses, char * v2_session_response)
{
struct HMACMD5Context context;
+ /* rest of v2 struct already generated */
memcpy(v2_session_response + 8, ses->server->cryptKey,8);
- /* gen_blob(v2_session_response + 16); */
hmac_md5_init_limK_to_64(ses->server->mac_signing_key, 16, &context);
- hmac_md5_update(ses->server->cryptKey,8,&context);
-/* hmac_md5_update(v2_session_response+16)client thing,8,&context); */ /* BB fix */
+ hmac_md5_update(v2_session_response+8,
+ sizeof(struct ntlmv2_resp) - 8, &context);
hmac_md5_final(v2_session_response,&context);
- cifs_dump_mem("v2_sess_rsp: ", v2_session_response, 32); /* BB removeme BB */
+/* cifs_dump_mem("v2_sess_rsp: ", v2_session_response, 32); */
}
diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index 824afb9..7ffd5b0 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -285,9 +285,11 @@
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 CalcNTLMv2_partial_mac_key(struct cifsSesInfo *, struct nls_table *);
-extern void CalcNTLMv2_response(const struct cifsSesInfo *,char * );
-extern void setup_ntlmv2_rsp(const struct cifsSesInfo *, char *);
+extern int CalcNTLMv2_partial_mac_key(struct cifsSesInfo *,
+ const struct nls_table *);
+extern void CalcNTLMv2_response(const struct cifsSesInfo *, char * );
+extern void setup_ntlmv2_rsp(struct cifsSesInfo *, char *,
+ const struct nls_table *);
#ifdef CONFIG_CIFS_WEAK_PW_HASH
extern void calc_lanman_hash(struct cifsSesInfo * ses, char * lnm_session_key);
#endif /* CIFS_WEAK_PW_HASH */
diff --git a/fs/cifs/sess.c b/fs/cifs/sess.c
index c6fd01f..c039b54 100644
--- a/fs/cifs/sess.c
+++ b/fs/cifs/sess.c
@@ -432,7 +432,7 @@
cpu_to_le16(sizeof(struct ntlmv2_resp));
/* calculate session key */
- setup_ntlmv2_rsp(ses, v2_sess_key);
+ setup_ntlmv2_rsp(ses, v2_sess_key, nls_cp);
if(first_time) /* should this be moved into common code
with similar ntlmv2 path? */
/* cifs_calculate_ntlmv2_mac_key(ses->server->mac_signing_key,