On Tue, Sep 21, 2010 at 1:40 PM, Jeff Layton <jlayton@xxxxxxxxx> wrote:
> On Tue, 21 Sep 2010 13:26:08 -0500
> Shirish Pargaonkar <shirishpargaonkar@xxxxxxxxx> wrote:
>
>> On Tue, Sep 21, 2010 at 12:52 PM, Jeff Layton <jlayton@xxxxxxxxx> wrote:
>> > On Sat, 18 Sep 2010 22:02:35 -0500
>> > shirishpargaonkar@xxxxxxxxx wrote:
>> >
>> >> From: Shirish Pargaonkar <shirishpargaonkar@xxxxxxxxx>
>> >>
>> >>
>> >> Mark dependency on crypto modules in Kconfig.
>> >>
>> >> Defining per structures sdesc and cifs_secmech which are used to store
>> >> crypto hash functions and contexts. They are stored per smb connection
>> >> and used for all auth mechs to genereate hash values and signatures.
>> >>
>> >> Allocate crypto hashing functions, security descriptiors, and respective
>> >> contexts when a smb/tcp connection is established.
>> >> Release them when a tcp/smb connection is taken down.
>> >>
>> >> md5 and hmac-md5 are two crypto hashing functions that are used
>> >> throught the life of an smb/tcp connection by various functions that
>> >> calcualte signagure and ntlmv2 hash, HMAC etc.
>> >>
>> >> structure ntlmssp_auth and filed cphready is defined as per smb connection.
>> >>
>> >> ntlmssp_auth holds secondary key which is a nonce that gets used as a key
>> >> to generate signatures, ciphertext is genereated by rc4/arc4 encryption of
>> >> secondary key using ntlmv2 session key and sent in the session key field of
>> >> the type 3 message sent by the client during ntlmssp negotiation/exchange
>> >> These are per session structures and secondary key and cipher text
>> >> get calculated only once per smb connection, during first smb session setup
>> >> for that smb connection.
>> >>
>> >> Field cphready is used to mark such that once secondary keys and ciphertext
>> >> are calculated during very first smb session setup for a smb connection
>> >> and ciphertext is sent to the server, the same does not happen during
>> >> subsequent smb session setups/establishments.
>> >>
>> >> A key is exchanged with the server if client indicates so in flags in
>> >> type 1 messsage and server agrees in flag in type 2 message of ntlmssp
>> >> negotiation. If both client and agree, a key sent by client in
>> >> type 3 message of ntlmssp negotiation in the session key field.
>> >> The key is a ciphertext generated off of secondary key, a nonce, using
>> >> ntlmv2 hash via rc4/arc4.
>> >>
>> >> If authentication is successful, the secondary key is the that client
>> >> uses to calculate cifs/smb signature in the messages that client sends
>> >> and to verify the messages sent by server.
>> >> This key stays with the smb connection for its life and is the key used
>> >> to generate (and verify) signatures for all the subsequent smb sessions
>> >> for this smb connection.
>> >>
>> >> So only for the first smb session on any smb connection, type 1 message
>> >> of ntlmssp negotiation selects the flag NTLMSSP_NEGOTIATE_KEY_XCH.
>> >> It is not used for subsequent smb sessions on this smb connection i.e.
>> >> no need to generate secondary key, create ciphertext and send it etc.
>> >>
>> >> After the very first successful smb session, sequence number gets set
>> >> to 0 and variable cphready is used to mark that the key calculations
>> >> are done. cphready is reset when a reconnect of the smb connection
>> >> happens as sessions get set up again.
>> >>
>> >> Calculation of ciphertext and setting cphready, is done within
>> >> mutex lock to prevent race of smb session setups on a new smb connection.
>> >>
>> >>
>> >> Signed-off-by: Shirish Pargaonkar <shirishpargaonkar@xxxxxxxxx>
>> >> ---
>> >> fs/cifs/Kconfig | 3 +
>> >> fs/cifs/cifsencrypt.c | 125 +++++++++++++++++++++++++++++++++++++++++++++++++
>> >> fs/cifs/cifsglob.h | 28 +++++++++++
>> >> fs/cifs/cifspdu.h | 7 +++
>> >> fs/cifs/cifsproto.h | 3 +
>> >> fs/cifs/connect.c | 18 ++++++-
>> >> fs/cifs/sess.c | 26 +++++++---
>> >> 7 files changed, 200 insertions(+), 10 deletions(-)
>> >>
>> >> diff --git a/fs/cifs/Kconfig b/fs/cifs/Kconfig
>> >> index 917b7d4..0ed2139 100644
>> >> --- a/fs/cifs/Kconfig
>> >> +++ b/fs/cifs/Kconfig
>> >> @@ -2,6 +2,9 @@ config CIFS
>> >> tristate "CIFS support (advanced network filesystem, SMBFS successor)"
>> >> depends on INET
>> >> select NLS
>> >> + select CRYPTO
>> >> + select CRYPTO_MD5
>> >> + select CRYPTO_ARC4
>> >> help
>> >> This is the client VFS module for the Common Internet File System
>> >> (CIFS) protocol which is the successor to the Server Message Block
>> >> diff --git a/fs/cifs/cifsencrypt.c b/fs/cifs/cifsencrypt.c
>> >> index 730038a..48026c6 100644
>> >> --- a/fs/cifs/cifsencrypt.c
>> >> +++ b/fs/cifs/cifsencrypt.c
>> >> @@ -477,3 +477,128 @@ void CalcNTLMv2_response(const struct cifsSesInfo *ses,
>> >> hmac_md5_final(v2_session_response, &context);
>> >> /* 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;
>> >> + }
>> >> +
>> >> + mutex_lock(&server->srv_mutex);
>> >> + if (server->cphready) {
>> >> + mutex_unlock(&server->srv_mutex);
>> >> + 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 crypto API arc4\n");
>> >> + mutex_unlock(&server->srv_mutex);
>> >> + return PTR_ERR(tfm_arc4);
>> >> + }
>> >> +
>> >> + 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);
>> >> + if (rc) {
>> >> + cERROR(1, "could not encrypt session key rc: %d\n", rc);
>> >> + crypto_free_blkcipher(tfm_arc4);
>> >> + mutex_unlock(&server->srv_mutex);
>> >> + return rc;
>> >> + }
>> >> +
>> >> + crypto_free_blkcipher(tfm_arc4);
>> >> +
>> >> + server->sequence_number = 0;
>> >> + server->cphready = true;
>> >> + mutex_unlock(&server->srv_mutex);
>> >> +
>> >> + return 0;
>> >> +}
>> >> +
>> >> +void
>> >> +cifs_crypto_shash_release(struct TCP_Server_Info *server)
>> >> +{
>> >> + if (server->secmech.md5)
>> >> + crypto_free_shash(server->secmech.md5);
>> >> +
>> >> + if (server->secmech.hmacmd5)
>> >> + crypto_free_shash(server->secmech.hmacmd5);
>> >> +
>> >> + kfree(server->secmech.sdeschmacmd5);
>> >> +
>> >> + kfree(server->secmech.sdescmd5);
>> >> +}
>> >> +
>> >> +int
>> >> +cifs_crypto_shash_allocate(struct TCP_Server_Info *server)
>> >> +{
>> >> + int rc;
>> >> + unsigned int size;
>> >> +
>> >> + server->secmech.hmacmd5 = crypto_alloc_shash("hmac(md5)", 0, 0);
>> >> + if (!server->secmech.hmacmd5 ||
>> >> + IS_ERR(server->secmech.hmacmd5)) {
>> >> + cERROR(1, "could not allocate crypto hmacmd5\n");
>> >> + return PTR_ERR(server->secmech.hmacmd5);
>> >> + }
>> >> +
>> >> + server->secmech.md5 = crypto_alloc_shash("md5", 0, 0);
>> >> + if (!server->secmech.md5 || IS_ERR(server->secmech.md5)) {
>> >> + cERROR(1, "could not allocate crypto md5\n");
>> >> + rc = PTR_ERR(server->secmech.md5);
>> >> + goto crypto_allocate_md5_fail;
>> >> + }
>> >> +
>> >> + size = sizeof(struct shash_desc) +
>> >> + crypto_shash_descsize(server->secmech.hmacmd5);
>> >> + server->secmech.sdeschmacmd5 = kmalloc(size, GFP_KERNEL);
>> >> + if (!server->secmech.sdeschmacmd5) {
>> >> + cERROR(1, "cifs_crypto_shash_allocate: can't alloc hmacmd5\n");
>> >> + rc = -ENOMEM;
>> >> + goto crypto_allocate_hmacmd5_sdesc_fail;
>> >> + }
>> >> + server->secmech.sdeschmacmd5->shash.tfm = server->secmech.hmacmd5;
>> >> + server->secmech.sdeschmacmd5->shash.flags = 0x0;
>> >> +
>> >> +
>> >> + size = sizeof(struct shash_desc) +
>> >> + crypto_shash_descsize(server->secmech.md5);
>> >> + server->secmech.sdescmd5 = kmalloc(size, GFP_KERNEL);
>> >> + if (!server->secmech.sdescmd5) {
>> >> + cERROR(1, "cifs_crypto_shash_allocate: can't alloc md5\n");
>> >> + rc = -ENOMEM;
>> >> + goto crypto_allocate_md5_sdesc_fail;
>> >> + }
>> >> + server->secmech.sdescmd5->shash.tfm = server->secmech.md5;
>> >> + server->secmech.sdescmd5->shash.flags = 0x0;
>> >> +
>> >> + return 0;
>> >> +
>> >> +crypto_allocate_md5_sdesc_fail:
>> >> + kfree(server->secmech.sdeschmacmd5);
>> >> +
>> >> +crypto_allocate_hmacmd5_sdesc_fail:
>> >> + crypto_free_shash(server->secmech.md5);
>> >> +
>> >> +crypto_allocate_md5_fail:
>> >> + crypto_free_shash(server->secmech.hmacmd5);
>> >> +
>> >> + return rc;
>> >> +}
>> >> diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
>> >> index c68f31c..c7da866 100644
>> >> --- a/fs/cifs/cifsglob.h
>> >> +++ b/fs/cifs/cifsglob.h
>> >> @@ -25,6 +25,9 @@
>> >> #include <linux/workqueue.h>
>> >> #include "cifs_fs_sb.h"
>> >> #include "cifsacl.h"
>> >> +#include <crypto/internal/hash.h>
>> >> +#include <linux/scatterlist.h>
>> >> +
>> >> /*
>> >> * The sizes of various internal tables and strings
>> >> */
>> >> @@ -109,6 +112,28 @@ struct session_key {
>> >> } data;
>> >> };
>> >>
>> >> +/* crypto security descriptor definition */
>> >> +struct sdesc {
>> >> + struct shash_desc shash;
>> >> + char ctx[];
>> >> +};
>> >> +
>> >> +/* crypto hashing related structure/fields, not speicific to a sec mech */
>> >> +struct cifs_secmech {
>> >> + struct crypto_shash *hmacmd5; /* hmac-md5 hash function */
>> >> + struct crypto_shash *md5; /* md5 hash function */
>> >> + struct sdesc *sdeschmacmd5; /* ctxt to generate ntlmv2 hash, CR1 */
>> >> + struct sdesc *sdescmd5; /* ctxt to generate cifs/smb signature */
>> >> +};
>> >> +
>> >> +/* per smb connection structure/fields */
>> >> +struct ntlmssp_auth {
>> >> + __u32 client_flags; /* sent by client in type 1 ntlmsssp exchange */
>> >> + __u32 server_flags; /* sent by server in type 2 ntlmssp exchange */
>> >> + unsigned char sec_key[CIFS_CPHTXT_SIZE]; /* a nonce client generates */
>> >> + unsigned char ciphertext[CIFS_CPHTXT_SIZE]; /* sent to server */
>> >> +};
>> >> +
>> >> struct cifs_cred {
>> >> int uid;
>> >> int gid;
>> >> @@ -187,6 +212,9 @@ struct TCP_Server_Info {
>> >> unsigned long lstrp; /* when we got last response from this server */
>> >> u16 dialect; /* dialect index that server chose */
>> >> /* extended security flavors that server supports */
>> >> + struct cifs_secmech secmech; /* crypto sec mech functs, descriptors */
>> >> + struct ntlmssp_auth ntlmssp; /* sec key, ciphertext, flags */
>> >> + bool cphready; /* ciphertext is calculated */
>> >> bool sec_kerberos; /* supports plain Kerberos */
>> >> bool sec_mskerberos; /* supports legacy MS Kerberos */
>> >> bool sec_kerberosu2u; /* supports U2U Kerberos */
>> >> diff --git a/fs/cifs/cifspdu.h b/fs/cifs/cifspdu.h
>> >> index b0f4b56..dc90a36 100644
>> >> --- a/fs/cifs/cifspdu.h
>> >> +++ b/fs/cifs/cifspdu.h
>> >> @@ -134,6 +134,13 @@
>> >> * Size of the session key (crypto key encrypted with the password
>> >> */
>> >> #define CIFS_SESS_KEY_SIZE (24)
>> >> +#define CIFS_CLIENT_CHALLENGE_SIZE (8)
>> >> +#define CIFS_SERVER_CHALLENGE_SIZE (8)
>> >> +#define CIFS_HMAC_MD5_HASH_SIZE (16)
>> >> +#define CIFS_CPHTXT_SIZE (16)
>> >> +#define CIFS_NTLMV2_SESSKEY_SIZE (16)
>> >> +#define CIFS_NTHASH_SIZE (16)
>> >> +
>> >>
>> >> /*
>> >> * Maximum user name length
>> >> diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
>> >> index c155479..d89a87a 100644
>> >> --- a/fs/cifs/cifsproto.h
>> >> +++ b/fs/cifs/cifsproto.h
>> >> @@ -369,6 +369,9 @@ extern int cifs_calculate_session_key(struct session_key *key, const char *rn,
>> >> extern void CalcNTLMv2_response(const struct cifsSesInfo *, char *);
>> >> 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 c99760a..4818089 100644
>> >> --- a/fs/cifs/connect.c
>> >> +++ b/fs/cifs/connect.c
>> >> @@ -199,6 +199,7 @@ cifs_reconnect(struct TCP_Server_Info *server)
>> >> if (server->tcpStatus != CifsExiting)
>> >> server->tcpStatus = CifsGood;
>> >> server->sequence_number = 0;
>> >> + server->cphready = false;
>> >> spin_unlock(&GlobalMid_Lock);
>> >> /* atomic_set(&server->inFlight,0);*/
>> >> wake_up(&server->response_q);
>> >> @@ -1502,6 +1503,7 @@ cifs_put_tcp_session(struct TCP_Server_Info *server)
>> >> server->tcpStatus = CifsExiting;
>> >> spin_unlock(&GlobalMid_Lock);
>> >>
>> >> + cifs_crypto_shash_release(server);
>> >> cifs_fscache_release_client_cookie(server);
>> >>
>> >> task = xchg(&server->tsk, NULL);
>> >> @@ -1556,12 +1558,19 @@ cifs_get_tcp_session(struct smb_vol *volume_info)
>> >> goto out_err;
>> >> }
>> >>
>> >> + rc = cifs_crypto_shash_allocate(tcp_ses);
>> >> + if (rc) {
>> >> + cERROR(1, "could not setup hash structures rc %d", rc);
>> >> + goto out_err;
>> >> + }
>> >> +
>> >> tcp_ses->hostname = extract_hostname(volume_info->UNC);
>> >> if (IS_ERR(tcp_ses->hostname)) {
>> >> rc = PTR_ERR(tcp_ses->hostname);
>> >> - goto out_err;
>> >> + 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;
>> >> @@ -1600,7 +1609,7 @@ cifs_get_tcp_session(struct smb_vol *volume_info)
>> >> }
>> >> if (rc < 0) {
>> >> cERROR(1, "Error connecting to socket. Aborting operation");
>> >> - goto out_err;
>> >> + goto out_err2;
>> >> }
>> >>
>> >> /*
>> >> @@ -1614,7 +1623,7 @@ cifs_get_tcp_session(struct smb_vol *volume_info)
>> >> rc = PTR_ERR(tcp_ses->tsk);
>> >> cERROR(1, "error %d create cifsd thread", rc);
>> >> module_put(THIS_MODULE);
>> >> - goto out_err;
>> >> + goto out_err2;
>> >> }
>> >>
>> >> /* thread spawned, put it on the list */
>> >> @@ -1626,6 +1635,9 @@ cifs_get_tcp_session(struct smb_vol *volume_info)
>> >>
>> >> return tcp_ses;
>> >>
>> >> +out_err2:
>> >> + cifs_crypto_shash_release(tcp_ses);
>> >> +
>> >> out_err:
>> >> if (tcp_ses) {
>> >> if (!IS_ERR(tcp_ses->hostname))
>> >> diff --git a/fs/cifs/sess.c b/fs/cifs/sess.c
>> >> index af18a50..45555de 100644
>> >> --- a/fs/cifs/sess.c
>> >> +++ b/fs/cifs/sess.c
>> >> @@ -407,7 +407,7 @@ static int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len,
>> >> /* In particular we can examine sign flags */
>> >> /* BB spec says that if AvId field of MsvAvTimestamp is populated then
>> >> we must set the MIC field of the AUTHENTICATE_MESSAGE */
>> >> -
>> >> + ses->server->ntlmssp.server_flags = le32_to_cpu(pblob->NegotiateFlags);
>> >> tioffset = cpu_to_le16(pblob->TargetInfoArray.BufferOffset);
>> >> tilen = cpu_to_le16(pblob->TargetInfoArray.Length);
>> >> ses->tilen = tilen;
>> >> @@ -443,10 +443,12 @@ 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:
>> >> return tmp - pbuffer;
>> >
>> >
>> > Ok, so this patch adds this cphready flag to the server struct and
>> > changes the ntlmssp code to use it. What about the other authtypes?
>> > NTLMv1 and Kerberos use a local "first_time" flag in CIFS_SessSetup.
>> >
>> > Why did you choose to add cphready instead of using that? If there is a
>> > good reason for it, the other authtypes should be changed to use
>> > cphready for consistency.
>>
>> The use of cphready which is a per smb connection structure is to make
>> sure that we calculate secondary session key and ciphertext only once
>> per smb connection, by the first session setup over that connection.
>> The secondary key which becomes session key is used to calculate signatures.
>>
>
> Right. I'm just not sure why we need a separate flag attached to the
> server struct for this. Why was the "first_time" mechanism not good
> enough here? I see no reason why that wouldn't have worked for NTLMSSP
> too.
>
> Note that I'm not attached to that mechanism, but I think it should be
> consistent for all sectypes. It makes no sense to use this cphready
> flag for NTLMSSP and then a completely different mechanism for other
> sectypes. If you want to add this, you should convert the other
> sectypes to use your new mechanism.
>
>> We do not have NTLMv1 any more and session key is not used to calculate
>> signature for kerberos auth type.
>>
>
> Wrong. From the Kerberos section of CIFS_SessSetup:
>
> if (first_time) {
> ses->server->session_key.len = msg->sesskey_len;
> memcpy(ses->server->session_key.data.krb5,
> msg->data, msg->sesskey_len);
> }
>
>
> It's most definitely used for calculating signatures on sockets that
> use krb5 auth.
>
>> >
>> > Also, not directly related to your changes, but it looks like the
>> > "plain" ntlmv2 code sets the session_key without any regard for whether
>> > it's the first session on the socket. I think that also ought to be
>> > fixed, probably in a separate patch.
>>
>> The same reason for "plain" ntlmv2, session key is not used to
>> calcuate signatures.
>>
>
> But it is...the session_key struct holds the pointer to the data that's
> used precisely for this.
>
>> SMB connection/setup combo using NTLMSSP security mechanism is stricter
>> about authentication response and signature compared to "plain" ntlmv2 or ntlmv1
>> or ntlm I think.
>>
> --
> Jeff Layton <jlayton@xxxxxxxxx>
>
Jeff, you are right. session key is used by kerberos and "plain"
ntlmv2 to calculate signatures.
--
To unsubscribe from this list: send the line "unsubscribe linux-cifs" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
