#include "md5.h"
#include "cifs_unicode.h"
#include "cifsproto.h"
+#include "ntlmssp.h"
#include <linux/ctype.h>
#include <linux/random.h>
}
#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)
{
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;
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 */
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,
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); */
}
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)) {
/* 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;
}
/* 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;
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;
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;
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);
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);
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);
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;
}
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
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;
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;
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) */
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;
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);
projects / users / hch / configfs.git / commitdiff