From: Shirish Pargaonkar <shirishpargaonkar@xxxxxxxxx>
Signed-off-by: Shirish Pargaonkar <shirishpargaonkar@xxxxxxxxx>
---
fs/cifs/cifsencrypt.c | 41 +++++++++++++++++++++++++++++++++++++++++
fs/cifs/cifsproto.h | 1 +
fs/cifs/connect.c | 1 +
fs/cifs/sess.c | 24 ++++++++++++++++++------
4 files changed, 61 insertions(+), 6 deletions(-)
diff --git a/fs/cifs/cifsencrypt.c b/fs/cifs/cifsencrypt.c
index 5fbd19b..0c1e9f2 100644
--- a/fs/cifs/cifsencrypt.c
+++ b/fs/cifs/cifsencrypt.c
@@ -435,6 +435,47 @@ void CalcNTLMv2_response(const struct cifsSesInfo *ses,
/* cifs_dump_mem("v2_sess_rsp: ", v2_session_response, 32); */
}
+int
+calc_seckey(struct TCP_Server_Info *server)
+{
+ int rc;
+ struct crypto_blkcipher *tfm_arc4;
+ struct scatterlist sgin, sgout;
+ struct blkcipher_desc desc;
+
+ if (!server) {
+ cERROR(1, "%s: Can't determine ciphertext key\n", __func__);
+ return 1;
+ }
+
+ if (server->cphready)
+ return 0;
+
+ get_random_bytes(server->ntlmssp.sec_key, CIFS_NTLMV2_SESSKEY_SIZE);
+
+ tfm_arc4 = crypto_alloc_blkcipher("ecb(arc4)",
+ 0, CRYPTO_ALG_ASYNC);
+ if (!tfm_arc4 || IS_ERR(tfm_arc4)) {
+ cERROR(1, "could not allocate " "master crypto API arc4\n");
+ return 1;
+ }
+
+ desc.tfm = tfm_arc4;
+
+ crypto_blkcipher_setkey(tfm_arc4,
+ server->session_key.data.ntlmv2.key, CIFS_CPHTXT_SIZE);
+ sg_init_one(&sgin, server->ntlmssp.sec_key, CIFS_CPHTXT_SIZE);
+ sg_init_one(&sgout, server->ntlmssp.ciphertext, CIFS_CPHTXT_SIZE);
+ rc = crypto_blkcipher_encrypt(&desc, &sgout, &sgin, CIFS_CPHTXT_SIZE);
+
+ crypto_free_blkcipher(tfm_arc4);
+
+ server->sequence_number = 0;
+ server->cphready = true;
+
+ return 0;
+}
+
void
cifs_crypto_shash_release(struct TCP_Server_Info *server)
{
diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index d1b9bc4..7c115a8 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -372,6 +372,7 @@ extern int setup_ntlmv2_rsp(struct cifsSesInfo *, char *,
const struct nls_table *);
extern int cifs_crypto_shash_allocate(struct TCP_Server_Info *);
extern void cifs_crypto_shash_release(struct TCP_Server_Info *);
+extern int calc_seckey(struct TCP_Server_Info *);
#ifdef CONFIG_CIFS_WEAK_PW_HASH
extern void calc_lanman_hash(const char *password, const char *cryptkey,
bool encrypt, char *lnm_session_key);
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 47b51eb..3da32aa 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -1589,6 +1589,7 @@ cifs_get_tcp_session(struct smb_vol *volume_info)
goto out_err2;
}
+ tcp_ses->cphready = false;
tcp_ses->noblocksnd = volume_info->noblocksnd;
tcp_ses->noautotune = volume_info->noautotune;
tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay;
diff --git a/fs/cifs/sess.c b/fs/cifs/sess.c
index f7fc3dc..238d5cb 100644
--- a/fs/cifs/sess.c
+++ b/fs/cifs/sess.c
@@ -444,10 +444,12 @@ static void build_ntlmssp_negotiate_blob(unsigned char *pbuffer,
NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
NTLMSSP_NEGOTIATE_NTLM;
if (ses->server->secMode &
- (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
+ (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) {
flags |= NTLMSSP_NEGOTIATE_SIGN;
- if (ses->server->secMode & SECMODE_SIGN_REQUIRED)
- flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
+ if (!ses->server->cphready)
+ flags |= NTLMSSP_NEGOTIATE_KEY_XCH |
+ NTLMSSP_NEGOTIATE_EXTENDED_SEC;
+ }
sec_blob->NegotiateFlags |= cpu_to_le32(flags);
@@ -553,9 +555,19 @@ static int build_ntlmssp_auth_blob(unsigned char *pbuffer,
sec_blob->WorkstationName.MaximumLength = 0;
tmp += 2;
- sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - pbuffer);
- sec_blob->SessionKey.Length = 0;
- sec_blob->SessionKey.MaximumLength = 0;
+ if ((ses->server->ntlmssp.server_flags & NTLMSSP_NEGOTIATE_KEY_XCH) &&
+ !calc_seckey(ses->server)) {
+ memcpy(tmp, ses->server->ntlmssp.ciphertext, CIFS_CPHTXT_SIZE);
+ sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - pbuffer);
+ sec_blob->SessionKey.Length = cpu_to_le16(CIFS_CPHTXT_SIZE);
+ sec_blob->SessionKey.MaximumLength =
+ cpu_to_le16(CIFS_CPHTXT_SIZE);
+ tmp += CIFS_CPHTXT_SIZE;
+ } else {
+ sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - pbuffer);
+ sec_blob->SessionKey.Length = 0;
+ sec_blob->SessionKey.MaximumLength = 0;
+ }
setup_ntlmv2_ret:
if (ses->server->tilen > 0)
--
1.6.0.2
--
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