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cifs NTLMv2/NTLMSSP ntlmv2 within ntlmssp autentication code

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Attribue Value (AV) pairs or Target Info (TI) pairs are part of
ntlmv2 authentication.
Structure ntlmv2_resp had only definition for two av pairs.
So removed it, and now allocation of av pairs is dynamic.
For servers like Windows 7/2008, av pairs sent by server in
challege packet (type 2 in the ntlmssp exchange/negotiation) can
vary.

Server sends them during ntlmssp negotiation. So when ntlmssp is used
as an authentication mechanism, type 2 challenge packet from server
has this information.  Pluck it and use the entire blob for
authenticaiton purpose.  If user has not specified, extract
(netbios) domain name from the av pairs which is used to calculate
ntlmv2 hash.  Servers like Windows 7 are particular about the AV pair
blob.

Servers like Windows 2003, are not very strict about the contents
of av pair blob used during ntlmv2 authentication.
So when security mechanism such as ntlmv2 is used (not ntlmv2 in ntlmssp),
there is no negotiation and so genereate a minimal blob that gets
used in ntlmv2 authentication as well as gets sent.

Fields tilen and tilbob are session specific.  AV pair values are defined.

To calculate ntlmv2 response we need ti/av pair blob.

For sec mech like ntlmssp, the blob is plucked from type 2 response from
the server.  From this blob, netbios name of the domain is retrieved,
if user has not already provided, to be included in the Target String
as part of ntlmv2 hash calculations.

For sec mech like ntlmv2, create a minimal, two av pair blob.

The allocated blob is freed in case of error.  In case there is no error,
this blob is used in calculating ntlmv2 response (in CalcNTLMv2_response)
and is also copied on the response to the server, and then freed.

The type 3 ntlmssp response is prepared on a buffer,
5 * sizeof of struct _AUTHENTICATE_MESSAGE, an empirical value large
enough to hold _AUTHENTICATE_MESSAGE plus a blob with max possible
10 values as part of ntlmv2 response and lmv2 keys and domain, user,
workstation  names etc.

Also, kerberos gets selected as a default mechanism if server supports it,
over the other security mechanisms.

Signed-off-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Shirish Pargaonkar 2010-09-18 22:02:18 -05:00 committed by Steve French
parent 5f98ca9afb
commit 2b149f1197
8 changed files with 225 additions and 53 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

121
fs/cifs/cifsencrypt.c
View File

@ -27,6 +27,7 @@
#include "md5.h"
#include "cifs_unicode.h"
#include "cifsproto.h"
#include "ntlmssp.h"
#include <linux/ctype.h>
#include <linux/random.h>
@ -262,6 +263,87 @@ void calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt,
}
#endif /* CIFS_WEAK_PW_HASH */
/* This is just a filler for ntlmv2 type of security mechanisms.
* Older servers are not very particular about the contents of av pairs
* in the blob and for sec mechs like ntlmv2, there is no negotiation
* as in ntlmssp, so unless domain and server netbios and dns names
* are specified, there is no way to obtain name. In case of ntlmssp,
* server provides that info in type 2 challenge packet
*/
static int
build_avpair_blob(struct cifsSesInfo *ses)
{
struct ntlmssp2_name *attrptr;
ses->tilen = 2 * sizeof(struct ntlmssp2_name);
ses->tiblob = kzalloc(ses->tilen, GFP_KERNEL);
if (!ses->tiblob) {
ses->tilen = 0;
cERROR(1, "Challenge target info allocation failure");
return -ENOMEM;
}
attrptr = (struct ntlmssp2_name *) ses->tiblob;
attrptr->type = cpu_to_le16(NTLMSSP_DOMAIN_TYPE);
return 0;
}
/* Server has provided av pairs/target info in the type 2 challenge
* packet and we have plucked it and stored within smb session.
* We parse that blob here to find netbios domain name to be used
* as part of ntlmv2 authentication (in Target String), if not already
* specified on the command line.
* If this function returns without any error but without fetching
* domain name, authentication may fail against some server but
* may not fail against other (those who are not very particular
* about target string i.e. for some, just user name might suffice.
*/
static int
find_domain_name(struct cifsSesInfo *ses)
{
unsigned int attrsize;
unsigned int type;
unsigned int onesize = sizeof(struct ntlmssp2_name);
unsigned char *blobptr;
unsigned char *blobend;
struct ntlmssp2_name *attrptr;
if (!ses->tilen || !ses->tiblob)
return 0;
blobptr = ses->tiblob;
blobend = ses->tiblob + ses->tilen;
while (blobptr + onesize < blobend) {
attrptr = (struct ntlmssp2_name *) blobptr;
type = le16_to_cpu(attrptr->type);
if (type == NTLMSSP_AV_EOL)
break;
blobptr += 2; /* advance attr type */
attrsize = le16_to_cpu(attrptr->length);
blobptr += 2; /* advance attr size */
if (blobptr + attrsize > blobend)
break;
if (type == NTLMSSP_AV_NB_DOMAIN_NAME) {
if (!attrsize)
break;
if (!ses->domainName) {
ses->domainName =
kmalloc(attrsize + 1, GFP_KERNEL);
if (!ses->domainName)
return -ENOMEM;
cifs_from_ucs2(ses->domainName,
(__le16 *)blobptr, attrsize, attrsize,
load_nls_default(), false);
break;
}
}
blobptr += attrsize; /* advance attr value */
}
return 0;
}
static int calc_ntlmv2_hash(struct cifsSesInfo *ses,
const struct nls_table *nls_cp)
{
@ -321,7 +403,8 @@ calc_exit_2:
return rc;
}
void setup_ntlmv2_rsp(struct cifsSesInfo *ses, char *resp_buf,
int
setup_ntlmv2_rsp(struct cifsSesInfo *ses, char *resp_buf,
const struct nls_table *nls_cp)
{
int rc;
@ -333,15 +416,29 @@ void setup_ntlmv2_rsp(struct cifsSesInfo *ses, char *resp_buf,
buf->time = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
get_random_bytes(&buf->client_chal, sizeof(buf->client_chal));
buf->reserved2 = 0;
buf->names[0].type = cpu_to_le16(NTLMSSP_DOMAIN_TYPE);
buf->names[0].length = 0;
buf->names[1].type = 0;
buf->names[1].length = 0;
if (ses->server->secType == RawNTLMSSP) {
if (!ses->domainName) {
rc = find_domain_name(ses);
if (rc) {
cERROR(1, "error %d finding domain name", rc);
goto setup_ntlmv2_rsp_ret;
}
}
} else {
rc = build_avpair_blob(ses);
if (rc) {
cERROR(1, "error %d building av pair blob", rc);
return rc;
}
}
/* calculate buf->ntlmv2_hash */
rc = calc_ntlmv2_hash(ses, nls_cp);
if (rc)
if (rc) {
cERROR(1, "could not get v2 hash rc %d", rc);
goto setup_ntlmv2_rsp_ret;
}
CalcNTLMv2_response(ses, resp_buf);
/* now calculate the MAC key for NTLMv2 */
@ -352,6 +449,15 @@ void setup_ntlmv2_rsp(struct cifsSesInfo *ses, char *resp_buf,
memcpy(&ses->server->session_key.data.ntlmv2.resp, resp_buf,
sizeof(struct ntlmv2_resp));
ses->server->session_key.len = 16 + sizeof(struct ntlmv2_resp);
return 0;
setup_ntlmv2_rsp_ret:
kfree(ses->tiblob);
ses->tiblob = NULL;
ses->tilen = 0;
return rc;
}
void CalcNTLMv2_response(const struct cifsSesInfo *ses,
@ -365,6 +471,9 @@ void CalcNTLMv2_response(const struct cifsSesInfo *ses,
hmac_md5_update(v2_session_response+8,
sizeof(struct ntlmv2_resp) - 8, &context);
if (ses->tilen)
hmac_md5_update(ses->tiblob, ses->tilen, &context);
hmac_md5_final(v2_session_response, &context);
/* cifs_dump_mem("v2_sess_rsp: ", v2_session_response, 32); */
}

2
fs/cifs/cifsglob.h
View File

@ -222,6 +222,8 @@ struct cifsSesInfo {
char userName[MAX_USERNAME_SIZE + 1];
char *domainName;
char *password;
unsigned int tilen; /* length of the target info blob */
unsigned char *tiblob; /* target info blob in challenge response */
bool need_reconnect:1; /* connection reset, uid now invalid */
};
/* no more than one of the following three session flags may be set */

1
fs/cifs/cifspdu.h
View File

@ -663,7 +663,6 @@ struct ntlmv2_resp {
__le64 time;
__u64 client_chal; /* random */
__u32 reserved2;
struct ntlmssp2_name names[2];
/* array of name entries could follow ending in minimum 4 byte struct */
} __attribute__((packed));

2
fs/cifs/cifsproto.h
View File

@ -368,7 +368,7 @@ extern int cifs_verify_signature(struct smb_hdr *,
extern int cifs_calculate_session_key(struct session_key *key, const char *rn,
const char *pass);
extern void CalcNTLMv2_response(const struct cifsSesInfo *, char *);
extern void setup_ntlmv2_rsp(struct cifsSesInfo *, char *,
extern int setup_ntlmv2_rsp(struct cifsSesInfo *, char *,
const struct nls_table *);
#ifdef CONFIG_CIFS_WEAK_PW_HASH
extern void calc_lanman_hash(const char *password, const char *cryptkey,

16
fs/cifs/cifssmb.c
View File

@ -603,13 +603,15 @@ CIFSSMBNegotiate(unsigned int xid, struct cifsSesInfo *ses)
rc = 0;
else
rc = -EINVAL;
if (server->sec_kerberos || server->sec_mskerberos)
server->secType = Kerberos;
else if (server->sec_ntlmssp)
server->secType = RawNTLMSSP;
else
rc = -EOPNOTSUPP;
if (server->secType == Kerberos) {
if (!server->sec_kerberos &&
!server->sec_mskerberos)
rc = -EOPNOTSUPP;
} else if (server->secType == RawNTLMSSP) {
if (!server->sec_ntlmssp)
rc = -EOPNOTSUPP;
} else
rc = -EOPNOTSUPP;
}
} else
server->capabilities &= ~CAP_EXTENDED_SECURITY;

2
fs/cifs/connect.c
View File

@ -1740,6 +1740,8 @@ cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info)
if (ses == NULL)
goto get_ses_fail;
ses->tilen = 0;
ses->tiblob = NULL;
/* new SMB session uses our server ref */
ses->server = server;
if (server->addr.sockAddr6.sin6_family == AF_INET6)

15
fs/cifs/ntlmssp.h
View File

@ -61,6 +61,21 @@
#define NTLMSSP_NEGOTIATE_KEY_XCH 0x40000000
#define NTLMSSP_NEGOTIATE_56 0x80000000
/* Define AV Pair Field IDs */
enum av_field_type {
NTLMSSP_AV_EOL = 0,
NTLMSSP_AV_NB_COMPUTER_NAME,
NTLMSSP_AV_NB_DOMAIN_NAME,
NTLMSSP_AV_DNS_COMPUTER_NAME,
NTLMSSP_AV_DNS_DOMAIN_NAME,
NTLMSSP_AV_DNS_TREE_NAME,
NTLMSSP_AV_FLAGS,
NTLMSSP_AV_TIMESTAMP,
NTLMSSP_AV_RESTRICTION,
NTLMSSP_AV_TARGET_NAME,
NTLMSSP_AV_CHANNEL_BINDINGS
};
/* Although typedefs are not commonly used for structure definitions */
/* in the Linux kernel, in this particular case they are useful */
/* to more closely match the standards document for NTLMSSP from */

119
fs/cifs/sess.c
View File

@ -383,6 +383,9 @@ static int decode_ascii_ssetup(char **pbcc_area, int bleft,
static int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len,
struct cifsSesInfo *ses)
{
unsigned int tioffset; /* challenge message target info area */
unsigned int tilen; /* challenge message target info area length */
CHALLENGE_MESSAGE *pblob = (CHALLENGE_MESSAGE *)bcc_ptr;
if (blob_len < sizeof(CHALLENGE_MESSAGE)) {
@ -405,6 +408,19 @@ static int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len,
/* BB spec says that if AvId field of MsvAvTimestamp is populated then
we must set the MIC field of the AUTHENTICATE_MESSAGE */
tioffset = cpu_to_le16(pblob->TargetInfoArray.BufferOffset);
tilen = cpu_to_le16(pblob->TargetInfoArray.Length);
ses->tilen = tilen;
if (ses->tilen) {
ses->tiblob = kmalloc(tilen, GFP_KERNEL);
if (!ses->tiblob) {
cERROR(1, "Challenge target info allocation failure");
ses->tilen = 0;
return -ENOMEM;
}
memcpy(ses->tiblob, bcc_ptr + tioffset, ses->tilen);
}
return 0;
}
@ -425,7 +441,7 @@ static void build_ntlmssp_negotiate_blob(unsigned char *pbuffer,
/* BB is NTLMV2 session security format easier to use here? */
flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET |
NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
NTLMSSP_NEGOTIATE_NT_ONLY | NTLMSSP_NEGOTIATE_NTLM;
NTLMSSP_NEGOTIATE_NTLM;
if (ses->server->secMode &
(SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
flags |= NTLMSSP_NEGOTIATE_SIGN;
@ -449,12 +465,14 @@ static void build_ntlmssp_negotiate_blob(unsigned char *pbuffer,
This function returns the length of the data in the blob */
static int build_ntlmssp_auth_blob(unsigned char *pbuffer,
struct cifsSesInfo *ses,
const struct nls_table *nls_cp, bool first)
const struct nls_table *nls_cp)
{
int rc;
unsigned int size;
AUTHENTICATE_MESSAGE *sec_blob = (AUTHENTICATE_MESSAGE *)pbuffer;
__u32 flags;
unsigned char *tmp;
char ntlm_session_key[CIFS_SESS_KEY_SIZE];
struct ntlmv2_resp ntlmv2_response = {};
memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
sec_blob->MessageType = NtLmAuthenticate;
@ -462,7 +480,7 @@ static int build_ntlmssp_auth_blob(unsigned char *pbuffer,
flags = NTLMSSP_NEGOTIATE_56 |
NTLMSSP_REQUEST_TARGET | NTLMSSP_NEGOTIATE_TARGET_INFO |
NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
NTLMSSP_NEGOTIATE_NT_ONLY | NTLMSSP_NEGOTIATE_NTLM;
NTLMSSP_NEGOTIATE_NTLM;
if (ses->server->secMode &
(SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
flags |= NTLMSSP_NEGOTIATE_SIGN;
@ -477,19 +495,26 @@ static int build_ntlmssp_auth_blob(unsigned char *pbuffer,
sec_blob->LmChallengeResponse.Length = 0;
sec_blob->LmChallengeResponse.MaximumLength = 0;
/* calculate session key, BB what about adding similar ntlmv2 path? */
SMBNTencrypt(ses->password, ses->server->cryptKey, ntlm_session_key);
if (first)
cifs_calculate_session_key(&ses->server->session_key,
ntlm_session_key, ses->password);
memcpy(tmp, ntlm_session_key, CIFS_SESS_KEY_SIZE);
sec_blob->NtChallengeResponse.BufferOffset = cpu_to_le32(tmp - pbuffer);
sec_blob->NtChallengeResponse.Length = cpu_to_le16(CIFS_SESS_KEY_SIZE);
sec_blob->NtChallengeResponse.MaximumLength =
cpu_to_le16(CIFS_SESS_KEY_SIZE);
rc = setup_ntlmv2_rsp(ses, (char *)&ntlmv2_response, nls_cp);
if (rc) {
cERROR(1, "Error %d during NTLMSSP authentication", rc);
goto setup_ntlmv2_ret;
}
size = sizeof(struct ntlmv2_resp);
memcpy(tmp, (char *)&ntlmv2_response, size);
tmp += size;
if (ses->tilen > 0) {
memcpy(tmp, ses->tiblob, ses->tilen);
tmp += ses->tilen;
}
tmp += CIFS_SESS_KEY_SIZE;
sec_blob->NtChallengeResponse.Length = cpu_to_le16(size + ses->tilen);
sec_blob->NtChallengeResponse.MaximumLength =
cpu_to_le16(size + ses->tilen);
kfree(ses->tiblob);
ses->tiblob = NULL;
ses->tilen = 0;
if (ses->domainName == NULL) {
sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - pbuffer);
@ -501,7 +526,6 @@ static int build_ntlmssp_auth_blob(unsigned char *pbuffer,
len = cifs_strtoUCS((__le16 *)tmp, ses->domainName,
MAX_USERNAME_SIZE, nls_cp);
len *= 2; /* unicode is 2 bytes each */
len += 2; /* trailing null */
sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - pbuffer);
sec_blob->DomainName.Length = cpu_to_le16(len);
sec_blob->DomainName.MaximumLength = cpu_to_le16(len);
@ -518,7 +542,6 @@ static int build_ntlmssp_auth_blob(unsigned char *pbuffer,
len = cifs_strtoUCS((__le16 *)tmp, ses->userName,
MAX_USERNAME_SIZE, nls_cp);
len *= 2; /* unicode is 2 bytes each */
len += 2; /* trailing null */
sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - pbuffer);
sec_blob->UserName.Length = cpu_to_le16(len);
sec_blob->UserName.MaximumLength = cpu_to_le16(len);
@ -533,6 +556,8 @@ static int build_ntlmssp_auth_blob(unsigned char *pbuffer,
sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - pbuffer);
sec_blob->SessionKey.Length = 0;
sec_blob->SessionKey.MaximumLength = 0;
setup_ntlmv2_ret:
return tmp - pbuffer;
}
@ -545,19 +570,6 @@ static void setup_ntlmssp_neg_req(SESSION_SETUP_ANDX *pSMB,
return;
}
static int setup_ntlmssp_auth_req(SESSION_SETUP_ANDX *pSMB,
struct cifsSesInfo *ses,
const struct nls_table *nls, bool first_time)
{
int bloblen;
bloblen = build_ntlmssp_auth_blob(&pSMB->req.SecurityBlob[0], ses, nls,
first_time);
pSMB->req.SecurityBlobLength = cpu_to_le16(bloblen);
return bloblen;
}
#endif
int
@ -580,6 +592,8 @@ CIFS_SessSetup(unsigned int xid, struct cifsSesInfo *ses,
struct key *spnego_key = NULL;
__le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */
bool first_time;
int blob_len;
char *ntlmsspblob = NULL;
if (ses == NULL)
return -EINVAL;
@ -729,12 +743,24 @@ ssetup_ntlmssp_authenticate:
cpu_to_le16(sizeof(struct ntlmv2_resp));
/* calculate session key */
setup_ntlmv2_rsp(ses, v2_sess_key, nls_cp);
/* FIXME: calculate MAC key */
rc = setup_ntlmv2_rsp(ses, v2_sess_key, nls_cp);
if (rc) {
cERROR(1, "Error %d during NTLMv2 authentication", rc);
kfree(v2_sess_key);
goto ssetup_exit;
}
memcpy(bcc_ptr, (char *)v2_sess_key,
sizeof(struct ntlmv2_resp));
sizeof(struct ntlmv2_resp));
bcc_ptr += sizeof(struct ntlmv2_resp);
kfree(v2_sess_key);
if (ses->tilen > 0) {
memcpy(bcc_ptr, ses->tiblob, ses->tilen);
bcc_ptr += ses->tilen;
/* we never did allocate ses->domainName to free */
kfree(ses->tiblob);
ses->tiblob = NULL;
ses->tilen = 0;
}
if (ses->capabilities & CAP_UNICODE) {
if (iov[0].iov_len % 2) {
*bcc_ptr = 0;
@ -815,12 +841,28 @@ ssetup_ntlmssp_authenticate:
if (phase == NtLmNegotiate) {
setup_ntlmssp_neg_req(pSMB, ses);
iov[1].iov_len = sizeof(NEGOTIATE_MESSAGE);
iov[1].iov_base = &pSMB->req.SecurityBlob[0];
} else if (phase == NtLmAuthenticate) {
int blob_len;
blob_len = setup_ntlmssp_auth_req(pSMB, ses,
nls_cp,
first_time);
/* 5 is an empirical value, large enought to
* hold authenticate message, max 10 of
* av paris, doamin,user,workstation mames,
* flags etc..
*/
ntlmsspblob = kmalloc(
5*sizeof(struct _AUTHENTICATE_MESSAGE),
GFP_KERNEL);
if (!ntlmsspblob) {
cERROR(1, "Can't allocate NTLMSSP");
rc = -ENOMEM;
goto ssetup_exit;
}
blob_len = build_ntlmssp_auth_blob(ntlmsspblob,
ses, nls_cp);
iov[1].iov_len = blob_len;
iov[1].iov_base = ntlmsspblob;
pSMB->req.SecurityBlobLength =
cpu_to_le16(blob_len);
/* Make sure that we tell the server that we
are using the uid that it just gave us back
on the response (challenge) */
@ -830,7 +872,6 @@ ssetup_ntlmssp_authenticate:
rc = -ENOSYS;
goto ssetup_exit;
}
iov[1].iov_base = &pSMB->req.SecurityBlob[0];
/* unicode strings must be word aligned */
if ((iov[0].iov_len + iov[1].iov_len) % 2) {
*bcc_ptr = 0;
@ -931,6 +972,8 @@ ssetup_exit:
key_put(spnego_key);
}
kfree(str_area);
kfree(ntlmsspblob);
ntlmsspblob = NULL;
if (resp_buf_type == CIFS_SMALL_BUFFER) {
cFYI(1, "ssetup freeing small buf %p", iov[0].iov_base);
cifs_small_buf_release(iov[0].iov_base);