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Zdrojový kód Úkoly Pull requesty Akce Balíčky Projekty Vydání Wiki Aktivita

NTLM auth and sign - Allocate session key/client response dynamically

Procházet zdrojové kódy 
Start calculating auth response within a session.  Move/Add pertinet
data structures like session key, server challenge and ntlmv2_hash in
a session structure.  We should do the calculations within a session
before copying session key and response over to server data
structures because a session setup can fail.

Only after a very first smb session succeeds, it copy/make its
session key, session key of smb connection.  This key stays with
the smb connection throughout its life.
sequence_number within server is set to 0x2.

The authentication Message Authentication Key (mak) which consists
of session key followed by client response within structure session_key
is now dynamic.  Every authentication type allocates the key + response
sized memory within its session structure and later either assigns or
frees it once the client response is sent and if session's session key
becomes connetion's session key.

ntlm/ntlmi authentication functions are rearranged.  A function
named setup_ntlm_resp(), similar to setup_ntlmv2_resp(), replaces
function cifs_calculate_session_key().

size of CIFS_SESS_KEY_SIZE is changed to 16, to reflect the byte size
of the key it holds.

Reviewed-by: Jeff Layton <jlayton@samba.org>
Signed-off-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>
Tento commit je obsažen v:
Shirish Pargaonkar
2010-10-21 06:42:55 -05:00
odevzdal Steve French
rodič 6573e9b73e
revize 21e733930b
7 změnil soubory, kde provedl 134 přidání a 137 odebrání
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113
fs/cifs/cifsencrypt.c
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@@ -43,15 +43,16 @@ extern void SMBencrypt(unsigned char *passwd, const unsigned char *c8,
unsigned char *p24);
static int cifs_calculate_signature(const struct smb_hdr *cifs_pdu,
const struct session_key *key, char *signature)
struct TCP_Server_Info *server, char *signature)
{
struct MD5Context context;
if ((cifs_pdu == NULL) || (signature == NULL) || (key == NULL))
if (cifs_pdu == NULL || signature == NULL || server == NULL)
return -EINVAL;
cifs_MD5_init(&context);
cifs_MD5_update(&context, (char *)&key->data, key->len);
cifs_MD5_update(&context, server->session_key.response,
server->session_key.len);
cifs_MD5_update(&context, cifs_pdu->Protocol, cifs_pdu->smb_buf_length);
cifs_MD5_final(signature, &context);
@@ -79,8 +80,7 @@ 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->session_key,
smb_signature);
rc = cifs_calculate_signature(cifs_pdu, server, smb_signature);
if (rc)
memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
else
@@ -90,16 +90,17 @@ 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 struct session_key *key, char *signature)
struct TCP_Server_Info *server, char *signature)
{
struct MD5Context context;
int i;
if ((iov == NULL) || (signature == NULL) || (key == NULL))
if (iov == NULL || signature == NULL || server == NULL)
return -EINVAL;
cifs_MD5_init(&context);
cifs_MD5_update(&context, (char *)&key->data, key->len);
cifs_MD5_update(&context, server->session_key.response,
server->session_key.len);
for (i = 0; i < n_vec; i++) {
if (iov[i].iov_len == 0)
continue;
@@ -146,8 +147,7 @@ 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->session_key,
smb_signature);
rc = cifs_calc_signature2(iov, n_vec, server, smb_signature);
if (rc)
memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
else
@@ -157,14 +157,14 @@ int cifs_sign_smb2(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
}
int cifs_verify_signature(struct smb_hdr *cifs_pdu,
const struct session_key *session_key,
struct TCP_Server_Info *server,
__u32 expected_sequence_number)
{
unsigned int rc;
char server_response_sig[8];
char what_we_think_sig_should_be[20];
if (cifs_pdu == NULL || session_key == NULL)
if (cifs_pdu == NULL || server == NULL)
return -EINVAL;
if (cifs_pdu->Command == SMB_COM_NEGOTIATE)
@@ -193,7 +193,7 @@ int cifs_verify_signature(struct smb_hdr *cifs_pdu,
cpu_to_le32(expected_sequence_number);
cifs_pdu->Signature.Sequence.Reserved = 0;
rc = cifs_calculate_signature(cifs_pdu, session_key,
rc = cifs_calculate_signature(cifs_pdu, server,
what_we_think_sig_should_be);
if (rc)
@@ -209,18 +209,28 @@ int cifs_verify_signature(struct smb_hdr *cifs_pdu,
}
/* We fill in key by putting in 40 byte array which was allocated by caller */
int cifs_calculate_session_key(struct session_key *key, const char *rn,
const char *password)
/* first calculate 24 bytes ntlm response and then 16 byte session key */
int setup_ntlm_response(struct cifsSesInfo *ses)
{
char temp_key[16];
if ((key == NULL) || (rn == NULL))
unsigned int temp_len = CIFS_SESS_KEY_SIZE + CIFS_AUTH_RESP_SIZE;
char temp_key[CIFS_SESS_KEY_SIZE];
if (!ses)
return -EINVAL;
E_md4hash(password, temp_key);
mdfour(key->data.ntlm, temp_key, 16);
memcpy(key->data.ntlm+16, rn, CIFS_SESS_KEY_SIZE);
key->len = 40;
ses->auth_key.response = kmalloc(temp_len, GFP_KERNEL);
if (!ses->auth_key.response) {
cERROR(1, "NTLM can't allocate (%u bytes) memory", temp_len);
return -ENOMEM;
}
ses->auth_key.len = temp_len;
SMBNTencrypt(ses->password, ses->cryptKey,
ses->auth_key.response + CIFS_SESS_KEY_SIZE);
E_md4hash(ses->password, temp_key);
mdfour(ses->auth_key.response, temp_key, CIFS_SESS_KEY_SIZE);
return 0;
}
@@ -465,19 +475,13 @@ calc_exit_2:
}
int
setup_ntlmv2_rsp(struct cifsSesInfo *ses, char *resp_buf,
const struct nls_table *nls_cp)
setup_ntlmv2_rsp(struct cifsSesInfo *ses, const struct nls_table *nls_cp)
{
int rc;
struct ntlmv2_resp *buf = (struct ntlmv2_resp *)resp_buf;
int baselen;
struct ntlmv2_resp *buf;
struct HMACMD5Context context;
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));
buf->reserved2 = 0;
if (ses->server->secType == RawNTLMSSP) {
if (!ses->domainName) {
rc = find_domain_name(ses);
@@ -494,22 +498,38 @@ setup_ntlmv2_rsp(struct cifsSesInfo *ses, char *resp_buf,
}
}
baselen = CIFS_SESS_KEY_SIZE + sizeof(struct ntlmv2_resp);
ses->auth_key.len = baselen + ses->tilen;
ses->auth_key.response = kmalloc(ses->auth_key.len, GFP_KERNEL);
if (!ses->auth_key.response) {
rc = ENOMEM;
cERROR(1, "%s: Can't allocate auth blob", __func__);
goto setup_ntlmv2_rsp_ret;
}
buf = (struct ntlmv2_resp *)
(ses->auth_key.response + CIFS_SESS_KEY_SIZE);
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));
buf->reserved2 = 0;
memcpy(ses->auth_key.response + baselen, ses->tiblob, ses->tilen);
/* calculate buf->ntlmv2_hash */
rc = calc_ntlmv2_hash(ses, nls_cp);
if (rc) {
cERROR(1, "could not get v2 hash rc %d", rc);
goto setup_ntlmv2_rsp_ret;
}
CalcNTLMv2_response(ses, resp_buf);
CalcNTLMv2_response(ses);
/* now calculate the session key for NTLMv2 */
hmac_md5_init_limK_to_64(ses->ntlmv2_hash, 16, &context);
hmac_md5_update(resp_buf, 16, &context);
hmac_md5_final(ses->auth_key.data.ntlmv2.key, &context);
memcpy(&ses->auth_key.data.ntlmv2.resp, resp_buf,
sizeof(struct ntlmv2_resp));
ses->auth_key.len = 16 + sizeof(struct ntlmv2_resp);
hmac_md5_update(ses->auth_key.response + CIFS_SESS_KEY_SIZE,
16, &context);
hmac_md5_final(ses->auth_key.response, &context);
return 0;
@@ -521,20 +541,17 @@ setup_ntlmv2_rsp_ret:
return rc;
}
void CalcNTLMv2_response(const struct cifsSesInfo *ses,
char *v2_session_response)
void CalcNTLMv2_response(const struct cifsSesInfo *ses)
{
unsigned int offset = CIFS_SESS_KEY_SIZE + 8;
struct HMACMD5Context context;
/* rest of v2 struct already generated */
memcpy(v2_session_response + 8, ses->cryptKey, 8);
memcpy(ses->auth_key.response + offset, ses->cryptKey, 8);
hmac_md5_init_limK_to_64(ses->ntlmv2_hash, 16, &context);
hmac_md5_update(v2_session_response+8,
sizeof(struct ntlmv2_resp) - 8, &context);
hmac_md5_update(ses->auth_key.response + offset,
ses->auth_key.len - offset, &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); */
hmac_md5_final(ses->auth_key.response + CIFS_SESS_KEY_SIZE, &context);
}