mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-28 20:02:17 +00:00
![Shyam Prasad N](/assets/img/avatar_default.png)
A spin lock called chan_lock was introduced recently. But not all accesses were protected. Doing that with this change. To make sure that a channel is not freed when in use, we need to introduce a ref count. But today, we don't ever free channels. Signed-off-by: Shyam Prasad N <sprasad@microsoft.com> Signed-off-by: Steve French <stfrench@microsoft.com>
933 lines
23 KiB
C
933 lines
23 KiB
C
// SPDX-License-Identifier: LGPL-2.1
|
|
/*
|
|
*
|
|
* Copyright (C) International Business Machines Corp., 2002, 2011
|
|
* Etersoft, 2012
|
|
* Author(s): Steve French (sfrench@us.ibm.com)
|
|
* Jeremy Allison (jra@samba.org) 2006
|
|
* Pavel Shilovsky (pshilovsky@samba.org) 2012
|
|
*
|
|
*/
|
|
|
|
#include <linux/fs.h>
|
|
#include <linux/list.h>
|
|
#include <linux/wait.h>
|
|
#include <linux/net.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/uaccess.h>
|
|
#include <asm/processor.h>
|
|
#include <linux/mempool.h>
|
|
#include <linux/highmem.h>
|
|
#include <crypto/aead.h>
|
|
#include "cifsglob.h"
|
|
#include "cifsproto.h"
|
|
#include "smb2proto.h"
|
|
#include "cifs_debug.h"
|
|
#include "smb2status.h"
|
|
#include "smb2glob.h"
|
|
|
|
static int
|
|
smb3_crypto_shash_allocate(struct TCP_Server_Info *server)
|
|
{
|
|
struct cifs_secmech *p = &server->secmech;
|
|
int rc;
|
|
|
|
rc = cifs_alloc_hash("hmac(sha256)",
|
|
&p->hmacsha256,
|
|
&p->sdeschmacsha256);
|
|
if (rc)
|
|
goto err;
|
|
|
|
rc = cifs_alloc_hash("cmac(aes)", &p->cmacaes, &p->sdesccmacaes);
|
|
if (rc)
|
|
goto err;
|
|
|
|
return 0;
|
|
err:
|
|
cifs_free_hash(&p->hmacsha256, &p->sdeschmacsha256);
|
|
return rc;
|
|
}
|
|
|
|
int
|
|
smb311_crypto_shash_allocate(struct TCP_Server_Info *server)
|
|
{
|
|
struct cifs_secmech *p = &server->secmech;
|
|
int rc = 0;
|
|
|
|
rc = cifs_alloc_hash("hmac(sha256)",
|
|
&p->hmacsha256,
|
|
&p->sdeschmacsha256);
|
|
if (rc)
|
|
return rc;
|
|
|
|
rc = cifs_alloc_hash("cmac(aes)", &p->cmacaes, &p->sdesccmacaes);
|
|
if (rc)
|
|
goto err;
|
|
|
|
rc = cifs_alloc_hash("sha512", &p->sha512, &p->sdescsha512);
|
|
if (rc)
|
|
goto err;
|
|
|
|
return 0;
|
|
|
|
err:
|
|
cifs_free_hash(&p->cmacaes, &p->sdesccmacaes);
|
|
cifs_free_hash(&p->hmacsha256, &p->sdeschmacsha256);
|
|
return rc;
|
|
}
|
|
|
|
|
|
static
|
|
int smb2_get_sign_key(__u64 ses_id, struct TCP_Server_Info *server, u8 *key)
|
|
{
|
|
struct cifs_chan *chan;
|
|
struct cifs_ses *ses = NULL;
|
|
struct TCP_Server_Info *it = NULL;
|
|
int i;
|
|
int rc = 0;
|
|
|
|
spin_lock(&cifs_tcp_ses_lock);
|
|
|
|
list_for_each_entry(it, &cifs_tcp_ses_list, tcp_ses_list) {
|
|
list_for_each_entry(ses, &it->smb_ses_list, smb_ses_list) {
|
|
if (ses->Suid == ses_id)
|
|
goto found;
|
|
}
|
|
}
|
|
cifs_server_dbg(VFS, "%s: Could not find session 0x%llx\n",
|
|
__func__, ses_id);
|
|
rc = -ENOENT;
|
|
goto out;
|
|
|
|
found:
|
|
spin_lock(&ses->chan_lock);
|
|
if (cifs_chan_needs_reconnect(ses, server) &&
|
|
!CIFS_ALL_CHANS_NEED_RECONNECT(ses)) {
|
|
/*
|
|
* If we are in the process of binding a new channel
|
|
* to an existing session, use the master connection
|
|
* session key
|
|
*/
|
|
memcpy(key, ses->smb3signingkey, SMB3_SIGN_KEY_SIZE);
|
|
spin_unlock(&ses->chan_lock);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* Otherwise, use the channel key.
|
|
*/
|
|
|
|
for (i = 0; i < ses->chan_count; i++) {
|
|
chan = ses->chans + i;
|
|
if (chan->server == server) {
|
|
memcpy(key, chan->signkey, SMB3_SIGN_KEY_SIZE);
|
|
spin_unlock(&ses->chan_lock);
|
|
goto out;
|
|
}
|
|
}
|
|
spin_unlock(&ses->chan_lock);
|
|
|
|
cifs_dbg(VFS,
|
|
"%s: Could not find channel signing key for session 0x%llx\n",
|
|
__func__, ses_id);
|
|
rc = -ENOENT;
|
|
|
|
out:
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
return rc;
|
|
}
|
|
|
|
static struct cifs_ses *
|
|
smb2_find_smb_ses_unlocked(struct TCP_Server_Info *server, __u64 ses_id)
|
|
{
|
|
struct cifs_ses *ses;
|
|
|
|
list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
|
|
if (ses->Suid != ses_id)
|
|
continue;
|
|
++ses->ses_count;
|
|
return ses;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
struct cifs_ses *
|
|
smb2_find_smb_ses(struct TCP_Server_Info *server, __u64 ses_id)
|
|
{
|
|
struct cifs_ses *ses;
|
|
|
|
spin_lock(&cifs_tcp_ses_lock);
|
|
ses = smb2_find_smb_ses_unlocked(server, ses_id);
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
|
|
return ses;
|
|
}
|
|
|
|
static struct cifs_tcon *
|
|
smb2_find_smb_sess_tcon_unlocked(struct cifs_ses *ses, __u32 tid)
|
|
{
|
|
struct cifs_tcon *tcon;
|
|
|
|
list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
|
|
if (tcon->tid != tid)
|
|
continue;
|
|
++tcon->tc_count;
|
|
return tcon;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Obtain tcon corresponding to the tid in the given
|
|
* cifs_ses
|
|
*/
|
|
|
|
struct cifs_tcon *
|
|
smb2_find_smb_tcon(struct TCP_Server_Info *server, __u64 ses_id, __u32 tid)
|
|
{
|
|
struct cifs_ses *ses;
|
|
struct cifs_tcon *tcon;
|
|
|
|
spin_lock(&cifs_tcp_ses_lock);
|
|
ses = smb2_find_smb_ses_unlocked(server, ses_id);
|
|
if (!ses) {
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
return NULL;
|
|
}
|
|
tcon = smb2_find_smb_sess_tcon_unlocked(ses, tid);
|
|
if (!tcon) {
|
|
cifs_put_smb_ses(ses);
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
return NULL;
|
|
}
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
/* tcon already has a ref to ses, so we don't need ses anymore */
|
|
cifs_put_smb_ses(ses);
|
|
|
|
return tcon;
|
|
}
|
|
|
|
int
|
|
smb2_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server,
|
|
bool allocate_crypto)
|
|
{
|
|
int rc;
|
|
unsigned char smb2_signature[SMB2_HMACSHA256_SIZE];
|
|
unsigned char *sigptr = smb2_signature;
|
|
struct kvec *iov = rqst->rq_iov;
|
|
struct smb2_hdr *shdr = (struct smb2_hdr *)iov[0].iov_base;
|
|
struct cifs_ses *ses;
|
|
struct shash_desc *shash;
|
|
struct crypto_shash *hash;
|
|
struct sdesc *sdesc = NULL;
|
|
struct smb_rqst drqst;
|
|
|
|
ses = smb2_find_smb_ses(server, le64_to_cpu(shdr->SessionId));
|
|
if (!ses) {
|
|
cifs_server_dbg(VFS, "%s: Could not find session\n", __func__);
|
|
return 0;
|
|
}
|
|
|
|
memset(smb2_signature, 0x0, SMB2_HMACSHA256_SIZE);
|
|
memset(shdr->Signature, 0x0, SMB2_SIGNATURE_SIZE);
|
|
|
|
if (allocate_crypto) {
|
|
rc = cifs_alloc_hash("hmac(sha256)", &hash, &sdesc);
|
|
if (rc) {
|
|
cifs_server_dbg(VFS,
|
|
"%s: sha256 alloc failed\n", __func__);
|
|
goto out;
|
|
}
|
|
shash = &sdesc->shash;
|
|
} else {
|
|
hash = server->secmech.hmacsha256;
|
|
shash = &server->secmech.sdeschmacsha256->shash;
|
|
}
|
|
|
|
rc = crypto_shash_setkey(hash, ses->auth_key.response,
|
|
SMB2_NTLMV2_SESSKEY_SIZE);
|
|
if (rc) {
|
|
cifs_server_dbg(VFS,
|
|
"%s: Could not update with response\n",
|
|
__func__);
|
|
goto out;
|
|
}
|
|
|
|
rc = crypto_shash_init(shash);
|
|
if (rc) {
|
|
cifs_server_dbg(VFS, "%s: Could not init sha256", __func__);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* For SMB2+, __cifs_calc_signature() expects to sign only the actual
|
|
* data, that is, iov[0] should not contain a rfc1002 length.
|
|
*
|
|
* Sign the rfc1002 length prior to passing the data (iov[1-N]) down to
|
|
* __cifs_calc_signature().
|
|
*/
|
|
drqst = *rqst;
|
|
if (drqst.rq_nvec >= 2 && iov[0].iov_len == 4) {
|
|
rc = crypto_shash_update(shash, iov[0].iov_base,
|
|
iov[0].iov_len);
|
|
if (rc) {
|
|
cifs_server_dbg(VFS,
|
|
"%s: Could not update with payload\n",
|
|
__func__);
|
|
goto out;
|
|
}
|
|
drqst.rq_iov++;
|
|
drqst.rq_nvec--;
|
|
}
|
|
|
|
rc = __cifs_calc_signature(&drqst, server, sigptr, shash);
|
|
if (!rc)
|
|
memcpy(shdr->Signature, sigptr, SMB2_SIGNATURE_SIZE);
|
|
|
|
out:
|
|
if (allocate_crypto)
|
|
cifs_free_hash(&hash, &sdesc);
|
|
if (ses)
|
|
cifs_put_smb_ses(ses);
|
|
return rc;
|
|
}
|
|
|
|
static int generate_key(struct cifs_ses *ses, struct kvec label,
|
|
struct kvec context, __u8 *key, unsigned int key_size)
|
|
{
|
|
unsigned char zero = 0x0;
|
|
__u8 i[4] = {0, 0, 0, 1};
|
|
__u8 L128[4] = {0, 0, 0, 128};
|
|
__u8 L256[4] = {0, 0, 1, 0};
|
|
int rc = 0;
|
|
unsigned char prfhash[SMB2_HMACSHA256_SIZE];
|
|
unsigned char *hashptr = prfhash;
|
|
struct TCP_Server_Info *server = ses->server;
|
|
|
|
memset(prfhash, 0x0, SMB2_HMACSHA256_SIZE);
|
|
memset(key, 0x0, key_size);
|
|
|
|
rc = smb3_crypto_shash_allocate(server);
|
|
if (rc) {
|
|
cifs_server_dbg(VFS, "%s: crypto alloc failed\n", __func__);
|
|
goto smb3signkey_ret;
|
|
}
|
|
|
|
rc = crypto_shash_setkey(server->secmech.hmacsha256,
|
|
ses->auth_key.response, SMB2_NTLMV2_SESSKEY_SIZE);
|
|
if (rc) {
|
|
cifs_server_dbg(VFS, "%s: Could not set with session key\n", __func__);
|
|
goto smb3signkey_ret;
|
|
}
|
|
|
|
rc = crypto_shash_init(&server->secmech.sdeschmacsha256->shash);
|
|
if (rc) {
|
|
cifs_server_dbg(VFS, "%s: Could not init sign hmac\n", __func__);
|
|
goto smb3signkey_ret;
|
|
}
|
|
|
|
rc = crypto_shash_update(&server->secmech.sdeschmacsha256->shash,
|
|
i, 4);
|
|
if (rc) {
|
|
cifs_server_dbg(VFS, "%s: Could not update with n\n", __func__);
|
|
goto smb3signkey_ret;
|
|
}
|
|
|
|
rc = crypto_shash_update(&server->secmech.sdeschmacsha256->shash,
|
|
label.iov_base, label.iov_len);
|
|
if (rc) {
|
|
cifs_server_dbg(VFS, "%s: Could not update with label\n", __func__);
|
|
goto smb3signkey_ret;
|
|
}
|
|
|
|
rc = crypto_shash_update(&server->secmech.sdeschmacsha256->shash,
|
|
&zero, 1);
|
|
if (rc) {
|
|
cifs_server_dbg(VFS, "%s: Could not update with zero\n", __func__);
|
|
goto smb3signkey_ret;
|
|
}
|
|
|
|
rc = crypto_shash_update(&server->secmech.sdeschmacsha256->shash,
|
|
context.iov_base, context.iov_len);
|
|
if (rc) {
|
|
cifs_server_dbg(VFS, "%s: Could not update with context\n", __func__);
|
|
goto smb3signkey_ret;
|
|
}
|
|
|
|
if ((server->cipher_type == SMB2_ENCRYPTION_AES256_CCM) ||
|
|
(server->cipher_type == SMB2_ENCRYPTION_AES256_GCM)) {
|
|
rc = crypto_shash_update(&server->secmech.sdeschmacsha256->shash,
|
|
L256, 4);
|
|
} else {
|
|
rc = crypto_shash_update(&server->secmech.sdeschmacsha256->shash,
|
|
L128, 4);
|
|
}
|
|
if (rc) {
|
|
cifs_server_dbg(VFS, "%s: Could not update with L\n", __func__);
|
|
goto smb3signkey_ret;
|
|
}
|
|
|
|
rc = crypto_shash_final(&server->secmech.sdeschmacsha256->shash,
|
|
hashptr);
|
|
if (rc) {
|
|
cifs_server_dbg(VFS, "%s: Could not generate sha256 hash\n", __func__);
|
|
goto smb3signkey_ret;
|
|
}
|
|
|
|
memcpy(key, hashptr, key_size);
|
|
|
|
smb3signkey_ret:
|
|
return rc;
|
|
}
|
|
|
|
struct derivation {
|
|
struct kvec label;
|
|
struct kvec context;
|
|
};
|
|
|
|
struct derivation_triplet {
|
|
struct derivation signing;
|
|
struct derivation encryption;
|
|
struct derivation decryption;
|
|
};
|
|
|
|
static int
|
|
generate_smb3signingkey(struct cifs_ses *ses,
|
|
struct TCP_Server_Info *server,
|
|
const struct derivation_triplet *ptriplet)
|
|
{
|
|
int rc;
|
|
bool is_binding = false;
|
|
int chan_index = 0;
|
|
|
|
spin_lock(&ses->chan_lock);
|
|
is_binding = !CIFS_ALL_CHANS_NEED_RECONNECT(ses);
|
|
chan_index = cifs_ses_get_chan_index(ses, server);
|
|
/* TODO: introduce ref counting for channels when the can be freed */
|
|
spin_unlock(&ses->chan_lock);
|
|
|
|
/*
|
|
* All channels use the same encryption/decryption keys but
|
|
* they have their own signing key.
|
|
*
|
|
* When we generate the keys, check if it is for a new channel
|
|
* (binding) in which case we only need to generate a signing
|
|
* key and store it in the channel as to not overwrite the
|
|
* master connection signing key stored in the session
|
|
*/
|
|
|
|
if (is_binding) {
|
|
rc = generate_key(ses, ptriplet->signing.label,
|
|
ptriplet->signing.context,
|
|
ses->chans[chan_index].signkey,
|
|
SMB3_SIGN_KEY_SIZE);
|
|
if (rc)
|
|
return rc;
|
|
} else {
|
|
rc = generate_key(ses, ptriplet->signing.label,
|
|
ptriplet->signing.context,
|
|
ses->smb3signingkey,
|
|
SMB3_SIGN_KEY_SIZE);
|
|
if (rc)
|
|
return rc;
|
|
|
|
/* safe to access primary channel, since it will never go away */
|
|
spin_lock(&ses->chan_lock);
|
|
memcpy(ses->chans[0].signkey, ses->smb3signingkey,
|
|
SMB3_SIGN_KEY_SIZE);
|
|
spin_unlock(&ses->chan_lock);
|
|
|
|
rc = generate_key(ses, ptriplet->encryption.label,
|
|
ptriplet->encryption.context,
|
|
ses->smb3encryptionkey,
|
|
SMB3_ENC_DEC_KEY_SIZE);
|
|
rc = generate_key(ses, ptriplet->decryption.label,
|
|
ptriplet->decryption.context,
|
|
ses->smb3decryptionkey,
|
|
SMB3_ENC_DEC_KEY_SIZE);
|
|
if (rc)
|
|
return rc;
|
|
}
|
|
|
|
if (rc)
|
|
return rc;
|
|
|
|
#ifdef CONFIG_CIFS_DEBUG_DUMP_KEYS
|
|
cifs_dbg(VFS, "%s: dumping generated AES session keys\n", __func__);
|
|
/*
|
|
* The session id is opaque in terms of endianness, so we can't
|
|
* print it as a long long. we dump it as we got it on the wire
|
|
*/
|
|
cifs_dbg(VFS, "Session Id %*ph\n", (int)sizeof(ses->Suid),
|
|
&ses->Suid);
|
|
cifs_dbg(VFS, "Cipher type %d\n", server->cipher_type);
|
|
cifs_dbg(VFS, "Session Key %*ph\n",
|
|
SMB2_NTLMV2_SESSKEY_SIZE, ses->auth_key.response);
|
|
cifs_dbg(VFS, "Signing Key %*ph\n",
|
|
SMB3_SIGN_KEY_SIZE, ses->smb3signingkey);
|
|
if ((server->cipher_type == SMB2_ENCRYPTION_AES256_CCM) ||
|
|
(server->cipher_type == SMB2_ENCRYPTION_AES256_GCM)) {
|
|
cifs_dbg(VFS, "ServerIn Key %*ph\n",
|
|
SMB3_GCM256_CRYPTKEY_SIZE, ses->smb3encryptionkey);
|
|
cifs_dbg(VFS, "ServerOut Key %*ph\n",
|
|
SMB3_GCM256_CRYPTKEY_SIZE, ses->smb3decryptionkey);
|
|
} else {
|
|
cifs_dbg(VFS, "ServerIn Key %*ph\n",
|
|
SMB3_GCM128_CRYPTKEY_SIZE, ses->smb3encryptionkey);
|
|
cifs_dbg(VFS, "ServerOut Key %*ph\n",
|
|
SMB3_GCM128_CRYPTKEY_SIZE, ses->smb3decryptionkey);
|
|
}
|
|
#endif
|
|
return rc;
|
|
}
|
|
|
|
int
|
|
generate_smb30signingkey(struct cifs_ses *ses,
|
|
struct TCP_Server_Info *server)
|
|
|
|
{
|
|
struct derivation_triplet triplet;
|
|
struct derivation *d;
|
|
|
|
d = &triplet.signing;
|
|
d->label.iov_base = "SMB2AESCMAC";
|
|
d->label.iov_len = 12;
|
|
d->context.iov_base = "SmbSign";
|
|
d->context.iov_len = 8;
|
|
|
|
d = &triplet.encryption;
|
|
d->label.iov_base = "SMB2AESCCM";
|
|
d->label.iov_len = 11;
|
|
d->context.iov_base = "ServerIn ";
|
|
d->context.iov_len = 10;
|
|
|
|
d = &triplet.decryption;
|
|
d->label.iov_base = "SMB2AESCCM";
|
|
d->label.iov_len = 11;
|
|
d->context.iov_base = "ServerOut";
|
|
d->context.iov_len = 10;
|
|
|
|
return generate_smb3signingkey(ses, server, &triplet);
|
|
}
|
|
|
|
int
|
|
generate_smb311signingkey(struct cifs_ses *ses,
|
|
struct TCP_Server_Info *server)
|
|
|
|
{
|
|
struct derivation_triplet triplet;
|
|
struct derivation *d;
|
|
|
|
d = &triplet.signing;
|
|
d->label.iov_base = "SMBSigningKey";
|
|
d->label.iov_len = 14;
|
|
d->context.iov_base = ses->preauth_sha_hash;
|
|
d->context.iov_len = 64;
|
|
|
|
d = &triplet.encryption;
|
|
d->label.iov_base = "SMBC2SCipherKey";
|
|
d->label.iov_len = 16;
|
|
d->context.iov_base = ses->preauth_sha_hash;
|
|
d->context.iov_len = 64;
|
|
|
|
d = &triplet.decryption;
|
|
d->label.iov_base = "SMBS2CCipherKey";
|
|
d->label.iov_len = 16;
|
|
d->context.iov_base = ses->preauth_sha_hash;
|
|
d->context.iov_len = 64;
|
|
|
|
return generate_smb3signingkey(ses, server, &triplet);
|
|
}
|
|
|
|
int
|
|
smb3_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server,
|
|
bool allocate_crypto)
|
|
{
|
|
int rc;
|
|
unsigned char smb3_signature[SMB2_CMACAES_SIZE];
|
|
unsigned char *sigptr = smb3_signature;
|
|
struct kvec *iov = rqst->rq_iov;
|
|
struct smb2_hdr *shdr = (struct smb2_hdr *)iov[0].iov_base;
|
|
struct shash_desc *shash;
|
|
struct crypto_shash *hash;
|
|
struct sdesc *sdesc = NULL;
|
|
struct smb_rqst drqst;
|
|
u8 key[SMB3_SIGN_KEY_SIZE];
|
|
|
|
rc = smb2_get_sign_key(le64_to_cpu(shdr->SessionId), server, key);
|
|
if (rc)
|
|
return 0;
|
|
|
|
if (allocate_crypto) {
|
|
rc = cifs_alloc_hash("cmac(aes)", &hash, &sdesc);
|
|
if (rc)
|
|
return rc;
|
|
|
|
shash = &sdesc->shash;
|
|
} else {
|
|
hash = server->secmech.cmacaes;
|
|
shash = &server->secmech.sdesccmacaes->shash;
|
|
}
|
|
|
|
memset(smb3_signature, 0x0, SMB2_CMACAES_SIZE);
|
|
memset(shdr->Signature, 0x0, SMB2_SIGNATURE_SIZE);
|
|
|
|
rc = crypto_shash_setkey(hash, key, SMB2_CMACAES_SIZE);
|
|
if (rc) {
|
|
cifs_server_dbg(VFS, "%s: Could not set key for cmac aes\n", __func__);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* we already allocate sdesccmacaes when we init smb3 signing key,
|
|
* so unlike smb2 case we do not have to check here if secmech are
|
|
* initialized
|
|
*/
|
|
rc = crypto_shash_init(shash);
|
|
if (rc) {
|
|
cifs_server_dbg(VFS, "%s: Could not init cmac aes\n", __func__);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* For SMB2+, __cifs_calc_signature() expects to sign only the actual
|
|
* data, that is, iov[0] should not contain a rfc1002 length.
|
|
*
|
|
* Sign the rfc1002 length prior to passing the data (iov[1-N]) down to
|
|
* __cifs_calc_signature().
|
|
*/
|
|
drqst = *rqst;
|
|
if (drqst.rq_nvec >= 2 && iov[0].iov_len == 4) {
|
|
rc = crypto_shash_update(shash, iov[0].iov_base,
|
|
iov[0].iov_len);
|
|
if (rc) {
|
|
cifs_server_dbg(VFS, "%s: Could not update with payload\n",
|
|
__func__);
|
|
goto out;
|
|
}
|
|
drqst.rq_iov++;
|
|
drqst.rq_nvec--;
|
|
}
|
|
|
|
rc = __cifs_calc_signature(&drqst, server, sigptr, shash);
|
|
if (!rc)
|
|
memcpy(shdr->Signature, sigptr, SMB2_SIGNATURE_SIZE);
|
|
|
|
out:
|
|
if (allocate_crypto)
|
|
cifs_free_hash(&hash, &sdesc);
|
|
return rc;
|
|
}
|
|
|
|
/* must be called with server->srv_mutex held */
|
|
static int
|
|
smb2_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server)
|
|
{
|
|
int rc = 0;
|
|
struct smb2_hdr *shdr;
|
|
struct smb2_sess_setup_req *ssr;
|
|
bool is_binding;
|
|
bool is_signed;
|
|
|
|
shdr = (struct smb2_hdr *)rqst->rq_iov[0].iov_base;
|
|
ssr = (struct smb2_sess_setup_req *)shdr;
|
|
|
|
is_binding = shdr->Command == SMB2_SESSION_SETUP &&
|
|
(ssr->Flags & SMB2_SESSION_REQ_FLAG_BINDING);
|
|
is_signed = shdr->Flags & SMB2_FLAGS_SIGNED;
|
|
|
|
if (!is_signed)
|
|
return 0;
|
|
spin_lock(&cifs_tcp_ses_lock);
|
|
if (server->tcpStatus == CifsNeedNegotiate) {
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
return 0;
|
|
}
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
if (!is_binding && !server->session_estab) {
|
|
strncpy(shdr->Signature, "BSRSPYL", 8);
|
|
return 0;
|
|
}
|
|
|
|
rc = server->ops->calc_signature(rqst, server, false);
|
|
|
|
return rc;
|
|
}
|
|
|
|
int
|
|
smb2_verify_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
|
|
{
|
|
unsigned int rc;
|
|
char server_response_sig[SMB2_SIGNATURE_SIZE];
|
|
struct smb2_hdr *shdr =
|
|
(struct smb2_hdr *)rqst->rq_iov[0].iov_base;
|
|
|
|
if ((shdr->Command == SMB2_NEGOTIATE) ||
|
|
(shdr->Command == SMB2_SESSION_SETUP) ||
|
|
(shdr->Command == SMB2_OPLOCK_BREAK) ||
|
|
server->ignore_signature ||
|
|
(!server->session_estab))
|
|
return 0;
|
|
|
|
/*
|
|
* BB what if signatures are supposed to be on for session but
|
|
* server does not send one? BB
|
|
*/
|
|
|
|
/* Do not need to verify session setups with signature "BSRSPYL " */
|
|
if (memcmp(shdr->Signature, "BSRSPYL ", 8) == 0)
|
|
cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n",
|
|
shdr->Command);
|
|
|
|
/*
|
|
* Save off the origiginal signature so we can modify the smb and check
|
|
* our calculated signature against what the server sent.
|
|
*/
|
|
memcpy(server_response_sig, shdr->Signature, SMB2_SIGNATURE_SIZE);
|
|
|
|
memset(shdr->Signature, 0, SMB2_SIGNATURE_SIZE);
|
|
|
|
rc = server->ops->calc_signature(rqst, server, true);
|
|
|
|
if (rc)
|
|
return rc;
|
|
|
|
if (memcmp(server_response_sig, shdr->Signature, SMB2_SIGNATURE_SIZE)) {
|
|
cifs_dbg(VFS, "sign fail cmd 0x%x message id 0x%llx\n",
|
|
shdr->Command, shdr->MessageId);
|
|
return -EACCES;
|
|
} else
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Set message id for the request. Should be called after wait_for_free_request
|
|
* and when srv_mutex is held.
|
|
*/
|
|
static inline void
|
|
smb2_seq_num_into_buf(struct TCP_Server_Info *server,
|
|
struct smb2_hdr *shdr)
|
|
{
|
|
unsigned int i, num = le16_to_cpu(shdr->CreditCharge);
|
|
|
|
shdr->MessageId = get_next_mid64(server);
|
|
/* skip message numbers according to CreditCharge field */
|
|
for (i = 1; i < num; i++)
|
|
get_next_mid(server);
|
|
}
|
|
|
|
static struct mid_q_entry *
|
|
smb2_mid_entry_alloc(const struct smb2_hdr *shdr,
|
|
struct TCP_Server_Info *server)
|
|
{
|
|
struct mid_q_entry *temp;
|
|
unsigned int credits = le16_to_cpu(shdr->CreditCharge);
|
|
|
|
if (server == NULL) {
|
|
cifs_dbg(VFS, "Null TCP session in smb2_mid_entry_alloc\n");
|
|
return NULL;
|
|
}
|
|
|
|
temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS);
|
|
memset(temp, 0, sizeof(struct mid_q_entry));
|
|
kref_init(&temp->refcount);
|
|
temp->mid = le64_to_cpu(shdr->MessageId);
|
|
temp->credits = credits > 0 ? credits : 1;
|
|
temp->pid = current->pid;
|
|
temp->command = shdr->Command; /* Always LE */
|
|
temp->when_alloc = jiffies;
|
|
temp->server = server;
|
|
|
|
/*
|
|
* The default is for the mid to be synchronous, so the
|
|
* default callback just wakes up the current task.
|
|
*/
|
|
get_task_struct(current);
|
|
temp->creator = current;
|
|
temp->callback = cifs_wake_up_task;
|
|
temp->callback_data = current;
|
|
|
|
atomic_inc(&midCount);
|
|
temp->mid_state = MID_REQUEST_ALLOCATED;
|
|
trace_smb3_cmd_enter(le32_to_cpu(shdr->Id.SyncId.TreeId),
|
|
le64_to_cpu(shdr->SessionId),
|
|
le16_to_cpu(shdr->Command), temp->mid);
|
|
return temp;
|
|
}
|
|
|
|
static int
|
|
smb2_get_mid_entry(struct cifs_ses *ses, struct TCP_Server_Info *server,
|
|
struct smb2_hdr *shdr, struct mid_q_entry **mid)
|
|
{
|
|
spin_lock(&cifs_tcp_ses_lock);
|
|
if (server->tcpStatus == CifsExiting) {
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
return -ENOENT;
|
|
}
|
|
|
|
if (server->tcpStatus == CifsNeedReconnect) {
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
cifs_dbg(FYI, "tcp session dead - return to caller to retry\n");
|
|
return -EAGAIN;
|
|
}
|
|
|
|
if (server->tcpStatus == CifsNeedNegotiate &&
|
|
shdr->Command != SMB2_NEGOTIATE) {
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
return -EAGAIN;
|
|
}
|
|
|
|
if (ses->status == CifsNew) {
|
|
if ((shdr->Command != SMB2_SESSION_SETUP) &&
|
|
(shdr->Command != SMB2_NEGOTIATE)) {
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
return -EAGAIN;
|
|
}
|
|
/* else ok - we are setting up session */
|
|
}
|
|
|
|
if (ses->status == CifsExiting) {
|
|
if (shdr->Command != SMB2_LOGOFF) {
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
return -EAGAIN;
|
|
}
|
|
/* else ok - we are shutting down the session */
|
|
}
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
|
|
*mid = smb2_mid_entry_alloc(shdr, server);
|
|
if (*mid == NULL)
|
|
return -ENOMEM;
|
|
spin_lock(&GlobalMid_Lock);
|
|
list_add_tail(&(*mid)->qhead, &server->pending_mid_q);
|
|
spin_unlock(&GlobalMid_Lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
smb2_check_receive(struct mid_q_entry *mid, struct TCP_Server_Info *server,
|
|
bool log_error)
|
|
{
|
|
unsigned int len = mid->resp_buf_size;
|
|
struct kvec iov[1];
|
|
struct smb_rqst rqst = { .rq_iov = iov,
|
|
.rq_nvec = 1 };
|
|
|
|
iov[0].iov_base = (char *)mid->resp_buf;
|
|
iov[0].iov_len = len;
|
|
|
|
dump_smb(mid->resp_buf, min_t(u32, 80, len));
|
|
/* convert the length into a more usable form */
|
|
if (len > 24 && server->sign && !mid->decrypted) {
|
|
int rc;
|
|
|
|
rc = smb2_verify_signature(&rqst, server);
|
|
if (rc)
|
|
cifs_server_dbg(VFS, "SMB signature verification returned error = %d\n",
|
|
rc);
|
|
}
|
|
|
|
return map_smb2_to_linux_error(mid->resp_buf, log_error);
|
|
}
|
|
|
|
struct mid_q_entry *
|
|
smb2_setup_request(struct cifs_ses *ses, struct TCP_Server_Info *server,
|
|
struct smb_rqst *rqst)
|
|
{
|
|
int rc;
|
|
struct smb2_hdr *shdr =
|
|
(struct smb2_hdr *)rqst->rq_iov[0].iov_base;
|
|
struct mid_q_entry *mid;
|
|
|
|
smb2_seq_num_into_buf(server, shdr);
|
|
|
|
rc = smb2_get_mid_entry(ses, server, shdr, &mid);
|
|
if (rc) {
|
|
revert_current_mid_from_hdr(server, shdr);
|
|
return ERR_PTR(rc);
|
|
}
|
|
|
|
rc = smb2_sign_rqst(rqst, server);
|
|
if (rc) {
|
|
revert_current_mid_from_hdr(server, shdr);
|
|
cifs_delete_mid(mid);
|
|
return ERR_PTR(rc);
|
|
}
|
|
|
|
return mid;
|
|
}
|
|
|
|
struct mid_q_entry *
|
|
smb2_setup_async_request(struct TCP_Server_Info *server, struct smb_rqst *rqst)
|
|
{
|
|
int rc;
|
|
struct smb2_hdr *shdr =
|
|
(struct smb2_hdr *)rqst->rq_iov[0].iov_base;
|
|
struct mid_q_entry *mid;
|
|
|
|
spin_lock(&cifs_tcp_ses_lock);
|
|
if (server->tcpStatus == CifsNeedNegotiate &&
|
|
shdr->Command != SMB2_NEGOTIATE) {
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
return ERR_PTR(-EAGAIN);
|
|
}
|
|
spin_unlock(&cifs_tcp_ses_lock);
|
|
|
|
smb2_seq_num_into_buf(server, shdr);
|
|
|
|
mid = smb2_mid_entry_alloc(shdr, server);
|
|
if (mid == NULL) {
|
|
revert_current_mid_from_hdr(server, shdr);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
rc = smb2_sign_rqst(rqst, server);
|
|
if (rc) {
|
|
revert_current_mid_from_hdr(server, shdr);
|
|
DeleteMidQEntry(mid);
|
|
return ERR_PTR(rc);
|
|
}
|
|
|
|
return mid;
|
|
}
|
|
|
|
int
|
|
smb3_crypto_aead_allocate(struct TCP_Server_Info *server)
|
|
{
|
|
struct crypto_aead *tfm;
|
|
|
|
if (!server->secmech.ccmaesencrypt) {
|
|
if ((server->cipher_type == SMB2_ENCRYPTION_AES128_GCM) ||
|
|
(server->cipher_type == SMB2_ENCRYPTION_AES256_GCM))
|
|
tfm = crypto_alloc_aead("gcm(aes)", 0, 0);
|
|
else
|
|
tfm = crypto_alloc_aead("ccm(aes)", 0, 0);
|
|
if (IS_ERR(tfm)) {
|
|
cifs_server_dbg(VFS, "%s: Failed alloc encrypt aead\n",
|
|
__func__);
|
|
return PTR_ERR(tfm);
|
|
}
|
|
server->secmech.ccmaesencrypt = tfm;
|
|
}
|
|
|
|
if (!server->secmech.ccmaesdecrypt) {
|
|
if ((server->cipher_type == SMB2_ENCRYPTION_AES128_GCM) ||
|
|
(server->cipher_type == SMB2_ENCRYPTION_AES256_GCM))
|
|
tfm = crypto_alloc_aead("gcm(aes)", 0, 0);
|
|
else
|
|
tfm = crypto_alloc_aead("ccm(aes)", 0, 0);
|
|
if (IS_ERR(tfm)) {
|
|
crypto_free_aead(server->secmech.ccmaesencrypt);
|
|
server->secmech.ccmaesencrypt = NULL;
|
|
cifs_server_dbg(VFS, "%s: Failed to alloc decrypt aead\n",
|
|
__func__);
|
|
return PTR_ERR(tfm);
|
|
}
|
|
server->secmech.ccmaesdecrypt = tfm;
|
|
}
|
|
|
|
return 0;
|
|
}
|