From: Shirish Pargaonkar <shirishpargaonkar@xxxxxxxxx>
Start calculation 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 copies/makes its
session key, session key of smb connection. This key stays with
the smb connection throughout its life.
Signed-off-by: Shirish Pargaonkar <shirishpargaonkar@xxxxxxxxx>
---
fs/cifs/cifsencrypt.c | 16 ++++++++--------
fs/cifs/cifsglob.h | 6 ++++--
fs/cifs/cifssmb.c | 4 ++--
fs/cifs/connect.c | 16 +++++++++++++---
fs/cifs/sess.c | 28 ++++++++--------------------
5 files changed, 35 insertions(+), 35 deletions(-)
diff --git a/fs/cifs/cifsencrypt.c b/fs/cifs/cifsencrypt.c
index e3edd8a..7ac0056 100644
--- a/fs/cifs/cifsencrypt.c
+++ b/fs/cifs/cifsencrypt.c
@@ -458,7 +458,7 @@ 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->ntlmv2_hash, pctxt);
+ hmac_md5_final(ses->ntlmv2_hash, pctxt);
kfree(pctxt);
return rc;
@@ -502,14 +502,14 @@ setup_ntlmv2_rsp(struct cifsSesInfo *ses, char *resp_buf,
}
CalcNTLMv2_response(ses, resp_buf);
- /* now calculate the MAC key for NTLMv2 */
- hmac_md5_init_limK_to_64(ses->server->ntlmv2_hash, 16, &context);
+ /* 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->server->session_key.data.ntlmv2.key, &context);
+ hmac_md5_final(ses->auth_key.data.ntlmv2.key, &context);
- memcpy(&ses->server->session_key.data.ntlmv2.resp, resp_buf,
+ memcpy(&ses->auth_key.data.ntlmv2.resp, resp_buf,
sizeof(struct ntlmv2_resp));
- ses->server->session_key.len = 16 + sizeof(struct ntlmv2_resp);
+ ses->auth_key.len = 16 + sizeof(struct ntlmv2_resp);
return 0;
@@ -526,8 +526,8 @@ void CalcNTLMv2_response(const struct cifsSesInfo *ses,
{
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->ntlmv2_hash, 16, &context);
+ memcpy(v2_session_response + 8, 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);
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 4f85dfd..7d834b1 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -179,12 +179,10 @@ struct TCP_Server_Info {
int capabilities; /* allow selective disabling of caps by smb sess */
int timeAdj; /* Adjust for difference in server time zone in sec */
__u16 CurrentMid; /* multiplex id - rotating counter */
- char cryptKey[CIFS_CRYPTO_KEY_SIZE];
/* 16th byte of RFC1001 workstation name is always null */
char workstation_RFC1001_name[RFC1001_NAME_LEN_WITH_NULL];
__u32 sequence_number; /* needed for CIFS PDU signature */
struct session_key session_key;
- char ntlmv2_hash[16];
unsigned long lstrp; /* when we got last response from this server */
u16 dialect; /* dialect index that server chose */
/* extended security flavors that server supports */
@@ -192,6 +190,7 @@ struct TCP_Server_Info {
bool sec_mskerberos; /* supports legacy MS Kerberos */
bool sec_kerberosu2u; /* supports U2U Kerberos */
bool sec_ntlmssp; /* supports NTLMSSP */
+ bool session_estab; /* mark when very first sess is established */
#ifdef CONFIG_CIFS_FSCACHE
struct fscache_cookie *fscache; /* client index cache cookie */
#endif
@@ -223,6 +222,9 @@ struct cifsSesInfo {
char userName[MAX_USERNAME_SIZE + 1];
char *domainName;
char *password;
+ char cryptKey[CIFS_CRYPTO_KEY_SIZE];
+ struct session_key auth_key;
+ char ntlmv2_hash[16];
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 */
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index 54bd83a..a420c7b 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -503,7 +503,7 @@ CIFSSMBNegotiate(unsigned int xid, struct cifsSesInfo *ses)
if (rsp->EncryptionKeyLength ==
cpu_to_le16(CIFS_CRYPTO_KEY_SIZE)) {
- memcpy(server->cryptKey, rsp->EncryptionKey,
+ memcpy(ses->cryptKey, rsp->EncryptionKey,
CIFS_CRYPTO_KEY_SIZE);
} else if (server->secMode & SECMODE_PW_ENCRYPT) {
rc = -EIO; /* need cryptkey unless plain text */
@@ -574,7 +574,7 @@ CIFSSMBNegotiate(unsigned int xid, struct cifsSesInfo *ses)
server->timeAdj = (int)(__s16)le16_to_cpu(pSMBr->ServerTimeZone);
server->timeAdj *= 60;
if (pSMBr->EncryptionKeyLength == CIFS_CRYPTO_KEY_SIZE) {
- memcpy(server->cryptKey, pSMBr->u.EncryptionKey,
+ memcpy(ses->cryptKey, pSMBr->u.EncryptionKey,
CIFS_CRYPTO_KEY_SIZE);
} else if ((pSMBr->hdr.Flags2 & SMBFLG2_EXT_SEC)
&& (pSMBr->EncryptionKeyLength == 0)) {
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 4944fc8..3606ba8 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -206,6 +206,7 @@ cifs_reconnect(struct TCP_Server_Info *server)
if (server->tcpStatus != CifsExiting)
server->tcpStatus = CifsGood;
server->sequence_number = 0;
+ server->session_estab = false;
spin_unlock(&GlobalMid_Lock);
/* atomic_set(&server->inFlight,0);*/
wake_up(&server->response_q);
@@ -1631,6 +1632,7 @@ cifs_get_tcp_session(struct smb_vol *volume_info)
volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
memcpy(tcp_ses->server_RFC1001_name,
volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL);
+ tcp_ses->session_estab = false;
tcp_ses->sequence_number = 0;
INIT_LIST_HEAD(&tcp_ses->tcp_ses_list);
INIT_LIST_HEAD(&tcp_ses->smb_ses_list);
@@ -2983,14 +2985,13 @@ CIFSTCon(unsigned int xid, struct cifsSesInfo *ses,
#ifdef CONFIG_CIFS_WEAK_PW_HASH
if ((global_secflags & CIFSSEC_MAY_LANMAN) &&
(ses->server->secType == LANMAN))
- calc_lanman_hash(tcon->password, ses->server->cryptKey,
+ calc_lanman_hash(tcon->password, ses->cryptKey,
ses->server->secMode &
SECMODE_PW_ENCRYPT ? true : false,
bcc_ptr);
else
#endif /* CIFS_WEAK_PW_HASH */
- SMBNTencrypt(tcon->password, ses->server->cryptKey,
- bcc_ptr);
+ SMBNTencrypt(tcon->password, ses->cryptKey, bcc_ptr);
bcc_ptr += CIFS_SESS_KEY_SIZE;
if (ses->capabilities & CAP_UNICODE) {
@@ -3175,6 +3176,15 @@ int cifs_setup_session(unsigned int xid, struct cifsSesInfo *ses,
if (rc) {
cERROR(1, "Send error in SessSetup = %d", rc);
} else {
+ mutex_lock(&ses->server->srv_mutex);
+ if (!server->session_estab) {
+ memcpy(&server->session_key.data,
+ &ses->auth_key.data, ses->auth_key.len);
+ server->session_key.len = ses->auth_key.len;
+ ses->server->session_estab = true;
+ }
+ mutex_unlock(&server->srv_mutex);
+
cFYI(1, "CIFS Session Established successfully");
spin_lock(&GlobalMid_Lock);
ses->status = CifsGood;
diff --git a/fs/cifs/sess.c b/fs/cifs/sess.c
index c926e6c..2111bed 100644
--- a/fs/cifs/sess.c
+++ b/fs/cifs/sess.c
@@ -402,7 +402,7 @@ static int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len,
return -EINVAL;
}
- memcpy(ses->server->cryptKey, pblob->Challenge, CIFS_CRYPTO_KEY_SIZE);
+ memcpy(ses->cryptKey, pblob->Challenge, CIFS_CRYPTO_KEY_SIZE);
/* BB we could decode pblob->NegotiateFlags; some may be useful */
/* In particular we can examine sign flags */
/* BB spec says that if AvId field of MsvAvTimestamp is populated then
@@ -591,17 +591,12 @@ CIFS_SessSetup(unsigned int xid, struct cifsSesInfo *ses,
int bytes_remaining;
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;
- read_lock(&cifs_tcp_ses_lock);
- first_time = is_first_ses_reconnect(ses);
- read_unlock(&cifs_tcp_ses_lock);
-
type = ses->server->secType;
cFYI(1, "sess setup type %d", type);
@@ -672,7 +667,7 @@ ssetup_ntlmssp_authenticate:
/* BB calculate hash with password */
/* and copy into bcc */
- calc_lanman_hash(ses->password, ses->server->cryptKey,
+ calc_lanman_hash(ses->password, ses->cryptKey,
ses->server->secMode & SECMODE_PW_ENCRYPT ?
true : false, lnm_session_key);
@@ -699,15 +694,11 @@ ssetup_ntlmssp_authenticate:
cpu_to_le16(CIFS_SESS_KEY_SIZE);
/* calculate session key */
- SMBNTencrypt(ses->password, ses->server->cryptKey,
- ntlm_session_key);
+ SMBNTencrypt(ses->password, ses->cryptKey, ntlm_session_key);
- if (first_time) /* should this be moved into common code
- with similar ntlmv2 path? */
- cifs_calculate_session_key(&ses->server->session_key,
- ntlm_session_key, ses->password);
+ cifs_calculate_session_key(&ses->auth_key,
+ ntlm_session_key, ses->password);
/* copy session key */
-
memcpy(bcc_ptr, (char *)ntlm_session_key, CIFS_SESS_KEY_SIZE);
bcc_ptr += CIFS_SESS_KEY_SIZE;
memcpy(bcc_ptr, (char *)ntlm_session_key, CIFS_SESS_KEY_SIZE);
@@ -794,17 +785,14 @@ ssetup_ntlmssp_authenticate:
}
/* bail out if key is too long */
if (msg->sesskey_len >
- sizeof(ses->server->session_key.data.krb5)) {
+ sizeof(ses->auth_key.data.krb5)) {
cERROR(1, "Kerberos signing key too long (%u bytes)",
msg->sesskey_len);
rc = -EOVERFLOW;
goto ssetup_exit;
}
- if (first_time) {
- ses->server->session_key.len = msg->sesskey_len;
- memcpy(ses->server->session_key.data.krb5,
- msg->data, msg->sesskey_len);
- }
+ ses->auth_key.len = msg->sesskey_len;
+ memcpy(ses->auth_key.data.krb5, msg->data, msg->sesskey_len);
pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
capabilities |= CAP_EXTENDED_SECURITY;
pSMB->req.Capabilities = cpu_to_le32(capabilities);
--
1.6.0.2
--
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