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[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>
This commit is contained in:
Steve French 2007-07-09 07:55:14 +00:00 committed by Steve French
parent 3870253efb
commit b609f06ac4
8 changed files with 71 additions and 36 deletions
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4
fs/cifs/CHANGES
View File

@ -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

6
fs/cifs/TODO
View File

@ -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

63
fs/cifs/cifsencrypt.c
View File

@ -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);

14
fs/cifs/cifsglob.h
View File

@ -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 */
};

8
fs/cifs/cifsproto.h
View File

@ -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 * );

4
fs/cifs/connect.c
View File

@ -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,

2
fs/cifs/sess.c
View File

@ -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 */

6
fs/cifs/transport.c
View File

@ -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"));