[mirror_ubuntu-artful-kernel.git] / fs / cifs / smb2transport.c

/*
 *   fs/cifs/smb2transport.c
 *
 *   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
 *
 *   This library is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Lesser General Public License as published
 *   by the Free Software Foundation; either version 2.1 of the License, or
 *   (at your option) any later version.
 *
 *   This library is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 *   the GNU Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public License
 *   along with this library; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#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 "smb2pdu.h"
#include "cifsglob.h"
#include "cifsproto.h"
#include "smb2proto.h"
#include "cifs_debug.h"
#include "smb2status.h"
#include "smb2glob.h"

static int
smb2_crypto_shash_allocate(struct TCP_Server_Info *server)
{
	int rc;
	unsigned int size;

	if (server->secmech.sdeschmacsha256 != NULL)
		return 0; /* already allocated */

	server->secmech.hmacsha256 = crypto_alloc_shash("hmac(sha256)", 0, 0);
	if (IS_ERR(server->secmech.hmacsha256)) {
		cifs_dbg(VFS, "could not allocate crypto hmacsha256\n");
		rc = PTR_ERR(server->secmech.hmacsha256);
		server->secmech.hmacsha256 = NULL;
		return rc;
	}

	size = sizeof(struct shash_desc) +
			crypto_shash_descsize(server->secmech.hmacsha256);
	server->secmech.sdeschmacsha256 = kmalloc(size, GFP_KERNEL);
	if (!server->secmech.sdeschmacsha256) {
		crypto_free_shash(server->secmech.hmacsha256);
		server->secmech.hmacsha256 = NULL;
		return -ENOMEM;
	}
	server->secmech.sdeschmacsha256->shash.tfm = server->secmech.hmacsha256;
	server->secmech.sdeschmacsha256->shash.flags = 0x0;

	return 0;
}

static int
smb3_crypto_shash_allocate(struct TCP_Server_Info *server)
{
	unsigned int size;
	int rc;

	if (server->secmech.sdesccmacaes != NULL)
		return 0;  /* already allocated */

	rc = smb2_crypto_shash_allocate(server);
	if (rc)
		return rc;

	server->secmech.cmacaes = crypto_alloc_shash("cmac(aes)", 0, 0);
	if (IS_ERR(server->secmech.cmacaes)) {
		cifs_dbg(VFS, "could not allocate crypto cmac-aes");
		kfree(server->secmech.sdeschmacsha256);
		server->secmech.sdeschmacsha256 = NULL;
		crypto_free_shash(server->secmech.hmacsha256);
		server->secmech.hmacsha256 = NULL;
		rc = PTR_ERR(server->secmech.cmacaes);
		server->secmech.cmacaes = NULL;
		return rc;
	}

	size = sizeof(struct shash_desc) +
			crypto_shash_descsize(server->secmech.cmacaes);
	server->secmech.sdesccmacaes = kmalloc(size, GFP_KERNEL);
	if (!server->secmech.sdesccmacaes) {
		cifs_dbg(VFS, "%s: Can't alloc cmacaes\n", __func__);
		kfree(server->secmech.sdeschmacsha256);
		server->secmech.sdeschmacsha256 = NULL;
		crypto_free_shash(server->secmech.hmacsha256);
		crypto_free_shash(server->secmech.cmacaes);
		server->secmech.hmacsha256 = NULL;
		server->secmech.cmacaes = NULL;
		return -ENOMEM;
	}
	server->secmech.sdesccmacaes->shash.tfm = server->secmech.cmacaes;
	server->secmech.sdesccmacaes->shash.flags = 0x0;

	return 0;
}

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);
	list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
		if (ses->Suid != ses_id)
			continue;
		spin_unlock(&cifs_tcp_ses_lock);
		return ses;
	}
	spin_unlock(&cifs_tcp_ses_lock);

	return NULL;
}

int
smb2_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
{
	int rc;
	unsigned char smb2_signature[SMB2_HMACSHA256_SIZE];
	unsigned char *sigptr = smb2_signature;
	struct kvec *iov = rqst->rq_iov;
	struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)iov[1].iov_base;
	struct cifs_ses *ses;

	ses = smb2_find_smb_ses(server, shdr->SessionId);
	if (!ses) {
		cifs_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);

	rc = smb2_crypto_shash_allocate(server);
	if (rc) {
		cifs_dbg(VFS, "%s: shah256 alloc failed\n", __func__);
		return rc;
	}

	rc = crypto_shash_setkey(server->secmech.hmacsha256,
		ses->auth_key.response, SMB2_NTLMV2_SESSKEY_SIZE);
	if (rc) {
		cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
		return rc;
	}

	rc = crypto_shash_init(&server->secmech.sdeschmacsha256->shash);
	if (rc) {
		cifs_dbg(VFS, "%s: Could not init sha256", __func__);
		return rc;
	}

	rc = __cifs_calc_signature(rqst, server, sigptr,
		&server->secmech.sdeschmacsha256->shash);

	if (!rc)
		memcpy(shdr->Signature, sigptr, SMB2_SIGNATURE_SIZE);

	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 L[4] = {0, 0, 0, 128};
	int rc = 0;
	unsigned char prfhash[SMB2_HMACSHA256_SIZE];
	unsigned char *hashptr = prfhash;

	memset(prfhash, 0x0, SMB2_HMACSHA256_SIZE);
	memset(key, 0x0, key_size);

	rc = smb3_crypto_shash_allocate(ses->server);
	if (rc) {
		cifs_dbg(VFS, "%s: crypto alloc failed\n", __func__);
		goto smb3signkey_ret;
	}

	rc = crypto_shash_setkey(ses->server->secmech.hmacsha256,
		ses->auth_key.response, SMB2_NTLMV2_SESSKEY_SIZE);
	if (rc) {
		cifs_dbg(VFS, "%s: Could not set with session key\n", __func__);
		goto smb3signkey_ret;
	}

	rc = crypto_shash_init(&ses->server->secmech.sdeschmacsha256->shash);
	if (rc) {
		cifs_dbg(VFS, "%s: Could not init sign hmac\n", __func__);
		goto smb3signkey_ret;
	}

	rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
				i, 4);
	if (rc) {
		cifs_dbg(VFS, "%s: Could not update with n\n", __func__);
		goto smb3signkey_ret;
	}

	rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
				label.iov_base, label.iov_len);
	if (rc) {
		cifs_dbg(VFS, "%s: Could not update with label\n", __func__);
		goto smb3signkey_ret;
	}

	rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
				&zero, 1);
	if (rc) {
		cifs_dbg(VFS, "%s: Could not update with zero\n", __func__);
		goto smb3signkey_ret;
	}

	rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
				context.iov_base, context.iov_len);
	if (rc) {
		cifs_dbg(VFS, "%s: Could not update with context\n", __func__);
		goto smb3signkey_ret;
	}

	rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
				L, 4);
	if (rc) {
		cifs_dbg(VFS, "%s: Could not update with L\n", __func__);
		goto smb3signkey_ret;
	}

	rc = crypto_shash_final(&ses->server->secmech.sdeschmacsha256->shash,
				hashptr);
	if (rc) {
		cifs_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,
			const struct derivation_triplet *ptriplet)
{
	int rc;

	rc = generate_key(ses, ptriplet->signing.label,
			  ptriplet->signing.context, ses->smb3signingkey,
			  SMB3_SIGN_KEY_SIZE);
	if (rc)
		return rc;

	rc = generate_key(ses, ptriplet->encryption.label,
			  ptriplet->encryption.context, ses->smb3encryptionkey,
			  SMB3_SIGN_KEY_SIZE);
	if (rc)
		return rc;

	return generate_key(ses, ptriplet->decryption.label,
			    ptriplet->decryption.context,
			    ses->smb3decryptionkey, SMB3_SIGN_KEY_SIZE);
}

int
generate_smb30signingkey(struct cifs_ses *ses)

{
	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, &triplet);
}

int
generate_smb311signingkey(struct cifs_ses *ses)

{
	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, &triplet);
}

int
smb3_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
{
	int rc = 0;
	unsigned char smb3_signature[SMB2_CMACAES_SIZE];
	unsigned char *sigptr = smb3_signature;
	struct kvec *iov = rqst->rq_iov;
	struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)iov[1].iov_base;
	struct cifs_ses *ses;

	ses = smb2_find_smb_ses(server, shdr->SessionId);
	if (!ses) {
		cifs_dbg(VFS, "%s: Could not find session\n", __func__);
		return 0;
	}

	memset(smb3_signature, 0x0, SMB2_CMACAES_SIZE);
	memset(shdr->Signature, 0x0, SMB2_SIGNATURE_SIZE);

	rc = crypto_shash_setkey(server->secmech.cmacaes,
		ses->smb3signingkey, SMB2_CMACAES_SIZE);

	if (rc) {
		cifs_dbg(VFS, "%s: Could not set key for cmac aes\n", __func__);
		return rc;
	}

	/*
	 * 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(&server->secmech.sdesccmacaes->shash);
	if (rc) {
		cifs_dbg(VFS, "%s: Could not init cmac aes\n", __func__);
		return rc;
	}
	
	rc = __cifs_calc_signature(rqst, server, sigptr,
				   &server->secmech.sdesccmacaes->shash);

	if (!rc)
		memcpy(shdr->Signature, sigptr, SMB2_SIGNATURE_SIZE);

	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_sync_hdr *shdr =
			(struct smb2_sync_hdr *)rqst->rq_iov[1].iov_base;

	if (!(shdr->Flags & SMB2_FLAGS_SIGNED) ||
	    server->tcpStatus == CifsNeedNegotiate)
		return rc;

	if (!server->session_estab) {
		strncpy(shdr->Signature, "BSRSPYL", 8);
		return rc;
	}

	rc = server->ops->calc_signature(rqst, server);

	return rc;
}

int
smb2_verify_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
{
	unsigned int rc;
	char server_response_sig[16];
	struct smb2_sync_hdr *shdr =
			(struct smb2_sync_hdr *)rqst->rq_iov[1].iov_base;

	if ((shdr->Command == SMB2_NEGOTIATE) ||
	    (shdr->Command == SMB2_SESSION_SETUP) ||
	    (shdr->Command == SMB2_OPLOCK_BREAK) ||
	    (!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);

	mutex_lock(&server->srv_mutex);
	rc = server->ops->calc_signature(rqst, server);
	mutex_unlock(&server->srv_mutex);

	if (rc)
		return rc;

	if (memcmp(server_response_sig, shdr->Signature, SMB2_SIGNATURE_SIZE))
		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_sync_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_sync_hdr *shdr,
		     struct TCP_Server_Info *server)
{
	struct mid_q_entry *temp;

	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);
	if (temp == NULL)
		return temp;
	else {
		memset(temp, 0, sizeof(struct mid_q_entry));
		temp->mid = le64_to_cpu(shdr->MessageId);
		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.
		 */
		temp->callback = cifs_wake_up_task;
		temp->callback_data = current;
	}

	atomic_inc(&midCount);
	temp->mid_state = MID_REQUEST_ALLOCATED;
	return temp;
}

static int
smb2_get_mid_entry(struct cifs_ses *ses, struct smb2_sync_hdr *shdr,
		   struct mid_q_entry **mid)
{
	if (ses->server->tcpStatus == CifsExiting)
		return -ENOENT;

	if (ses->server->tcpStatus == CifsNeedReconnect) {
		cifs_dbg(FYI, "tcp session dead - return to caller to retry\n");
		return -EAGAIN;
	}

	if (ses->status == CifsNew) {
		if ((shdr->Command != SMB2_SESSION_SETUP) &&
		    (shdr->Command != SMB2_NEGOTIATE))
			return -EAGAIN;
		/* else ok - we are setting up session */
	}

	if (ses->status == CifsExiting) {
		if (shdr->Command != SMB2_LOGOFF)
			return -EAGAIN;
		/* else ok - we are shutting down the session */
	}

	*mid = smb2_mid_entry_alloc(shdr, ses->server);
	if (*mid == NULL)
		return -ENOMEM;
	spin_lock(&GlobalMid_Lock);
	list_add_tail(&(*mid)->qhead, &ses->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 = get_rfc1002_length(mid->resp_buf);
	struct kvec iov[2];
	struct smb_rqst rqst = { .rq_iov = iov,
				 .rq_nvec = 2 };

	iov[0].iov_base = (char *)mid->resp_buf;
	iov[0].iov_len = 4;
	iov[1].iov_base = (char *)mid->resp_buf + 4;
	iov[1].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_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 smb_rqst *rqst)
{
	int rc;
	struct smb2_sync_hdr *shdr =
			(struct smb2_sync_hdr *)rqst->rq_iov[1].iov_base;
	struct mid_q_entry *mid;

	smb2_seq_num_into_buf(ses->server, shdr);

	rc = smb2_get_mid_entry(ses, shdr, &mid);
	if (rc)
		return ERR_PTR(rc);
	rc = smb2_sign_rqst(rqst, ses->server);
	if (rc) {
		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_sync_hdr *shdr =
			(struct smb2_sync_hdr *)rqst->rq_iov[1].iov_base;
	struct mid_q_entry *mid;

	smb2_seq_num_into_buf(server, shdr);

	mid = smb2_mid_entry_alloc(shdr, server);
	if (mid == NULL)
		return ERR_PTR(-ENOMEM);

	rc = smb2_sign_rqst(rqst, server);
	if (rc) {
		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) {
		tfm = crypto_alloc_aead("ccm(aes)", 0, 0);
		if (IS_ERR(tfm)) {
			cifs_dbg(VFS, "%s: Failed to alloc encrypt aead\n",
				 __func__);
			return PTR_ERR(tfm);
		}
		server->secmech.ccmaesencrypt = tfm;
	}

	if (!server->secmech.ccmaesdecrypt) {
		tfm = crypto_alloc_aead("ccm(aes)", 0, 0);
		if (IS_ERR(tfm)) {
			crypto_free_aead(server->secmech.ccmaesencrypt);
			server->secmech.ccmaesencrypt = NULL;
			cifs_dbg(VFS, "%s: Failed to alloc decrypt aead\n",
				 __func__);
			return PTR_ERR(tfm);
		}
		server->secmech.ccmaesdecrypt = tfm;
	}

	return 0;
}
Commit	Line	Data
2dc7e1c0 PS	1	/*
	2	* fs/cifs/smb2transport.c
	3	*
	4	* Copyright (C) International Business Machines Corp., 2002, 2011
	5	* Etersoft, 2012
	6	* Author(s): Steve French (sfrench@us.ibm.com)
	7	* Jeremy Allison (jra@samba.org) 2006
	8	* Pavel Shilovsky (pshilovsky@samba.org) 2012
	9	*
	10	* This library is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU Lesser General Public License as published
	12	* by the Free Software Foundation; either version 2.1 of the License, or
	13	* (at your option) any later version.
	14	*
	15	* This library is distributed in the hope that it will be useful,
	16	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
	18	* the GNU Lesser General Public License for more details.
	19	*
	20	* You should have received a copy of the GNU Lesser General Public License
	21	* along with this library; if not, write to the Free Software
	22	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	23	*/
	24
	25	#include <linux/fs.h>
	26	#include <linux/list.h>
	27	#include <linux/wait.h>
	28	#include <linux/net.h>
	29	#include <linux/delay.h>
	30	#include <linux/uaccess.h>
	31	#include <asm/processor.h>
	32	#include <linux/mempool.h>
fb308a6f	33	#include <linux/highmem.h>
026e93dc	34	#include <crypto/aead.h>
2dc7e1c0 PS	35	#include "smb2pdu.h"
	36	#include "cifsglob.h"
	37	#include "cifsproto.h"
	38	#include "smb2proto.h"
	39	#include "cifs_debug.h"
	40	#include "smb2status.h"
3c1bf7e4 PS	41	#include "smb2glob.h"
3c1bf7e4 PS	42
95dc8dd1 SF	43	static int
	44	smb2_crypto_shash_allocate(struct TCP_Server_Info *server)
	45	{
ba482029	46	int rc;
95dc8dd1 SF	47	unsigned int size;
	48
	49	if (server->secmech.sdeschmacsha256 != NULL)
	50	return 0; /* already allocated */
	51
	52	server->secmech.hmacsha256 = crypto_alloc_shash("hmac(sha256)", 0, 0);
	53	if (IS_ERR(server->secmech.hmacsha256)) {
	54	cifs_dbg(VFS, "could not allocate crypto hmacsha256\n");
ba482029 JL	55	rc = PTR_ERR(server->secmech.hmacsha256);
	56	server->secmech.hmacsha256 = NULL;
	57	return rc;
95dc8dd1 SF	58	}
	59
	60	size = sizeof(struct shash_desc) +
	61	crypto_shash_descsize(server->secmech.hmacsha256);
	62	server->secmech.sdeschmacsha256 = kmalloc(size, GFP_KERNEL);
	63	if (!server->secmech.sdeschmacsha256) {
	64	crypto_free_shash(server->secmech.hmacsha256);
	65	server->secmech.hmacsha256 = NULL;
	66	return -ENOMEM;
	67	}
	68	server->secmech.sdeschmacsha256->shash.tfm = server->secmech.hmacsha256;
	69	server->secmech.sdeschmacsha256->shash.flags = 0x0;
	70
	71	return 0;
	72	}
	73
	74	static int
	75	smb3_crypto_shash_allocate(struct TCP_Server_Info *server)
	76	{
	77	unsigned int size;
	78	int rc;
	79
	80	if (server->secmech.sdesccmacaes != NULL)
	81	return 0; /* already allocated */
	82
	83	rc = smb2_crypto_shash_allocate(server);
	84	if (rc)
	85	return rc;
	86
	87	server->secmech.cmacaes = crypto_alloc_shash("cmac(aes)", 0, 0);
	88	if (IS_ERR(server->secmech.cmacaes)) {
	89	cifs_dbg(VFS, "could not allocate crypto cmac-aes");
	90	kfree(server->secmech.sdeschmacsha256);
	91	server->secmech.sdeschmacsha256 = NULL;
	92	crypto_free_shash(server->secmech.hmacsha256);
	93	server->secmech.hmacsha256 = NULL;
ba482029 JL	94	rc = PTR_ERR(server->secmech.cmacaes);
	95	server->secmech.cmacaes = NULL;
	96	return rc;
95dc8dd1 SF	97	}
	98
	99	size = sizeof(struct shash_desc) +
	100	crypto_shash_descsize(server->secmech.cmacaes);
	101	server->secmech.sdesccmacaes = kmalloc(size, GFP_KERNEL);
	102	if (!server->secmech.sdesccmacaes) {
	103	cifs_dbg(VFS, "%s: Can't alloc cmacaes\n", __func__);
	104	kfree(server->secmech.sdeschmacsha256);
	105	server->secmech.sdeschmacsha256 = NULL;
	106	crypto_free_shash(server->secmech.hmacsha256);
	107	crypto_free_shash(server->secmech.cmacaes);
	108	server->secmech.hmacsha256 = NULL;
	109	server->secmech.cmacaes = NULL;
	110	return -ENOMEM;
	111	}
	112	server->secmech.sdesccmacaes->shash.tfm = server->secmech.cmacaes;
	113	server->secmech.sdesccmacaes->shash.flags = 0x0;
	114
	115	return 0;
	116	}
	117
026e93dc PS	118	struct cifs_ses *
026e93dc PS	119	smb2_find_smb_ses(struct TCP_Server_Info *server, __u64 ses_id)
32811d24 SP	120	{
	121	struct cifs_ses *ses;
	122
	123	spin_lock(&cifs_tcp_ses_lock);
	124	list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
026e93dc	125	if (ses->Suid != ses_id)
32811d24 SP	126	continue;
	127	spin_unlock(&cifs_tcp_ses_lock);
	128	return ses;
	129	}
	130	spin_unlock(&cifs_tcp_ses_lock);
	131
	132	return NULL;
	133	}
	134
38107d45	135	int
0b688cfc	136	smb2_calc_signature(struct smb_rqst rqst, struct TCP_Server_Info server)
3c1bf7e4	137	{
16c568ef	138	int rc;
3c1bf7e4 PS	139	unsigned char smb2_signature[SMB2_HMACSHA256_SIZE];
3c1bf7e4 PS	140	unsigned char *sigptr = smb2_signature;
0b688cfc	141	struct kvec *iov = rqst->rq_iov;
738f9de5	142	struct smb2_sync_hdr shdr = (struct smb2_sync_hdr )iov[1].iov_base;
32811d24 SP	143	struct cifs_ses *ses;
32811d24 SP	144
026e93dc	145	ses = smb2_find_smb_ses(server, shdr->SessionId);
32811d24 SP	146	if (!ses) {
	147	cifs_dbg(VFS, "%s: Could not find session\n", __func__);
	148	return 0;
	149	}
3c1bf7e4 PS	150
3c1bf7e4 PS	151	memset(smb2_signature, 0x0, SMB2_HMACSHA256_SIZE);
31473fc4	152	memset(shdr->Signature, 0x0, SMB2_SIGNATURE_SIZE);
3c1bf7e4	153
95dc8dd1 SF	154	rc = smb2_crypto_shash_allocate(server);
	155	if (rc) {
	156	cifs_dbg(VFS, "%s: shah256 alloc failed\n", __func__);
	157	return rc;
	158	}
	159
3c1bf7e4	160	rc = crypto_shash_setkey(server->secmech.hmacsha256,
32811d24	161	ses->auth_key.response, SMB2_NTLMV2_SESSKEY_SIZE);
3c1bf7e4	162	if (rc) {
f96637be	163	cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
3c1bf7e4 PS	164	return rc;
	165	}
	166
	167	rc = crypto_shash_init(&server->secmech.sdeschmacsha256->shash);
	168	if (rc) {
95dc8dd1	169	cifs_dbg(VFS, "%s: Could not init sha256", __func__);
3c1bf7e4 PS	170	return rc;
	171	}
	172
16c568ef AV	173	rc = __cifs_calc_signature(rqst, server, sigptr,
16c568ef AV	174	&server->secmech.sdeschmacsha256->shash);
3c1bf7e4	175
16c568ef	176	if (!rc)
31473fc4	177	memcpy(shdr->Signature, sigptr, SMB2_SIGNATURE_SIZE);
3c1bf7e4 PS	178
	179	return rc;
	180	}
	181
373512ec SF	182	static int generate_key(struct cifs_ses *ses, struct kvec label,
373512ec SF	183	struct kvec context, __u8 *key, unsigned int key_size)
429b46f4 SF	184	{
	185	unsigned char zero = 0x0;
	186	__u8 i[4] = {0, 0, 0, 1};
	187	__u8 L[4] = {0, 0, 0, 128};
	188	int rc = 0;
	189	unsigned char prfhash[SMB2_HMACSHA256_SIZE];
	190	unsigned char *hashptr = prfhash;
	191
	192	memset(prfhash, 0x0, SMB2_HMACSHA256_SIZE);
373512ec	193	memset(key, 0x0, key_size);
429b46f4	194
32811d24	195	rc = smb3_crypto_shash_allocate(ses->server);
95dc8dd1 SF	196	if (rc) {
	197	cifs_dbg(VFS, "%s: crypto alloc failed\n", __func__);
	198	goto smb3signkey_ret;
	199	}
	200
32811d24 SP	201	rc = crypto_shash_setkey(ses->server->secmech.hmacsha256,
32811d24 SP	202	ses->auth_key.response, SMB2_NTLMV2_SESSKEY_SIZE);
429b46f4 SF	203	if (rc) {
	204	cifs_dbg(VFS, "%s: Could not set with session key\n", __func__);
	205	goto smb3signkey_ret;
	206	}
	207
32811d24	208	rc = crypto_shash_init(&ses->server->secmech.sdeschmacsha256->shash);
429b46f4 SF	209	if (rc) {
	210	cifs_dbg(VFS, "%s: Could not init sign hmac\n", __func__);
	211	goto smb3signkey_ret;
	212	}
	213
32811d24	214	rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
429b46f4 SF	215	i, 4);
	216	if (rc) {
	217	cifs_dbg(VFS, "%s: Could not update with n\n", __func__);
	218	goto smb3signkey_ret;
	219	}
	220
32811d24	221	rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
373512ec	222	label.iov_base, label.iov_len);
429b46f4 SF	223	if (rc) {
	224	cifs_dbg(VFS, "%s: Could not update with label\n", __func__);
	225	goto smb3signkey_ret;
	226	}
	227
32811d24	228	rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
429b46f4 SF	229	&zero, 1);
	230	if (rc) {
	231	cifs_dbg(VFS, "%s: Could not update with zero\n", __func__);
	232	goto smb3signkey_ret;
	233	}
	234
32811d24	235	rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
373512ec	236	context.iov_base, context.iov_len);
429b46f4 SF	237	if (rc) {
	238	cifs_dbg(VFS, "%s: Could not update with context\n", __func__);
	239	goto smb3signkey_ret;
	240	}
	241
32811d24	242	rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
429b46f4 SF	243	L, 4);
	244	if (rc) {
	245	cifs_dbg(VFS, "%s: Could not update with L\n", __func__);
	246	goto smb3signkey_ret;
	247	}
	248
32811d24	249	rc = crypto_shash_final(&ses->server->secmech.sdeschmacsha256->shash,
429b46f4 SF	250	hashptr);
	251	if (rc) {
	252	cifs_dbg(VFS, "%s: Could not generate sha256 hash\n", __func__);
	253	goto smb3signkey_ret;
	254	}
	255
373512ec	256	memcpy(key, hashptr, key_size);
429b46f4 SF	257
429b46f4 SF	258	smb3signkey_ret:
32811d24	259	return rc;
429b46f4 SF	260	}
429b46f4 SF	261
373512ec SF	262	struct derivation {
	263	struct kvec label;
	264	struct kvec context;
	265	};
	266
	267	struct derivation_triplet {
	268	struct derivation signing;
	269	struct derivation encryption;
	270	struct derivation decryption;
	271	};
	272
	273	static int
	274	generate_smb3signingkey(struct cifs_ses *ses,
	275	const struct derivation_triplet *ptriplet)
	276	{
	277	int rc;
	278
	279	rc = generate_key(ses, ptriplet->signing.label,
	280	ptriplet->signing.context, ses->smb3signingkey,
	281	SMB3_SIGN_KEY_SIZE);
	282	if (rc)
	283	return rc;
	284
	285	rc = generate_key(ses, ptriplet->encryption.label,
	286	ptriplet->encryption.context, ses->smb3encryptionkey,
	287	SMB3_SIGN_KEY_SIZE);
	288	if (rc)
	289	return rc;
	290
	291	return generate_key(ses, ptriplet->decryption.label,
	292	ptriplet->decryption.context,
	293	ses->smb3decryptionkey, SMB3_SIGN_KEY_SIZE);
	294	}
	295
	296	int
	297	generate_smb30signingkey(struct cifs_ses *ses)
	298
	299	{
	300	struct derivation_triplet triplet;
	301	struct derivation *d;
	302
	303	d = &triplet.signing;
	304	d->label.iov_base = "SMB2AESCMAC";
	305	d->label.iov_len = 12;
	306	d->context.iov_base = "SmbSign";
	307	d->context.iov_len = 8;
	308
	309	d = &triplet.encryption;
	310	d->label.iov_base = "SMB2AESCCM";
	311	d->label.iov_len = 11;
	312	d->context.iov_base = "ServerIn ";
	313	d->context.iov_len = 10;
	314
	315	d = &triplet.decryption;
	316	d->label.iov_base = "SMB2AESCCM";
	317	d->label.iov_len = 11;
	318	d->context.iov_base = "ServerOut";
	319	d->context.iov_len = 10;
	320
	321	return generate_smb3signingkey(ses, &triplet);
	322	}
	323
	324	int
	325	generate_smb311signingkey(struct cifs_ses *ses)
326
327	{
328	struct derivation_triplet triplet;
329	struct derivation *d;
330
331	d = &triplet.signing;
332	d->label.iov_base = "SMB2AESCMAC";
333	d->label.iov_len = 12;
334	d->context.iov_base = "SmbSign";
335	d->context.iov_len = 8;
336
337	d = &triplet.encryption;
338	d->label.iov_base = "SMB2AESCCM";
339	d->label.iov_len = 11;
340	d->context.iov_base = "ServerIn ";
341	d->context.iov_len = 10;
342
343	d = &triplet.decryption;
344	d->label.iov_base = "SMB2AESCCM";
345	d->label.iov_len = 11;
346	d->context.iov_base = "ServerOut";
347	d->context.iov_len = 10;
348
349	return generate_smb3signingkey(ses, &triplet);
350	}
351
38107d45 SF	352	int
	353	smb3_calc_signature(struct smb_rqst rqst, struct TCP_Server_Info server)
	354	{
32811d24	355	int rc = 0;
429b46f4 SF	356	unsigned char smb3_signature[SMB2_CMACAES_SIZE];
	357	unsigned char *sigptr = smb3_signature;
	358	struct kvec *iov = rqst->rq_iov;
738f9de5	359	struct smb2_sync_hdr shdr = (struct smb2_sync_hdr )iov[1].iov_base;
32811d24 SP	360	struct cifs_ses *ses;
32811d24 SP	361
026e93dc	362	ses = smb2_find_smb_ses(server, shdr->SessionId);
32811d24 SP	363	if (!ses) {
	364	cifs_dbg(VFS, "%s: Could not find session\n", __func__);
	365	return 0;
	366	}
429b46f4 SF	367
429b46f4 SF	368	memset(smb3_signature, 0x0, SMB2_CMACAES_SIZE);
31473fc4	369	memset(shdr->Signature, 0x0, SMB2_SIGNATURE_SIZE);
429b46f4 SF	370
429b46f4 SF	371	rc = crypto_shash_setkey(server->secmech.cmacaes,
32811d24 SP	372	ses->smb3signingkey, SMB2_CMACAES_SIZE);
32811d24 SP	373
429b46f4 SF	374	if (rc) {
	375	cifs_dbg(VFS, "%s: Could not set key for cmac aes\n", __func__);
	376	return rc;
	377	}
	378
95dc8dd1 SF	379	/*
	380	* we already allocate sdesccmacaes when we init smb3 signing key,
	381	* so unlike smb2 case we do not have to check here if secmech are
	382	* initialized
	383	*/
429b46f4 SF	384	rc = crypto_shash_init(&server->secmech.sdesccmacaes->shash);
	385	if (rc) {
	386	cifs_dbg(VFS, "%s: Could not init cmac aes\n", __func__);
	387	return rc;
	388	}
16c568ef AV	389
	390	rc = __cifs_calc_signature(rqst, server, sigptr,
	391	&server->secmech.sdesccmacaes->shash);
429b46f4	392
16c568ef	393	if (!rc)
31473fc4	394	memcpy(shdr->Signature, sigptr, SMB2_SIGNATURE_SIZE);
429b46f4 SF	395
429b46f4 SF	396	return rc;
38107d45 SF	397	}
38107d45 SF	398
3c1bf7e4 PS	399	/* must be called with server->srv_mutex held */
3c1bf7e4 PS	400	static int
0b688cfc	401	smb2_sign_rqst(struct smb_rqst rqst, struct TCP_Server_Info server)
3c1bf7e4 PS	402	{
3c1bf7e4 PS	403	int rc = 0;
738f9de5 PS	404	struct smb2_sync_hdr *shdr =
738f9de5 PS	405	(struct smb2_sync_hdr *)rqst->rq_iov[1].iov_base;
3c1bf7e4	406
31473fc4	407	if (!(shdr->Flags & SMB2_FLAGS_SIGNED) \|\|
3c1bf7e4 PS	408	server->tcpStatus == CifsNeedNegotiate)
	409	return rc;
	410
	411	if (!server->session_estab) {
31473fc4	412	strncpy(shdr->Signature, "BSRSPYL", 8);
3c1bf7e4 PS	413	return rc;
	414	}
	415
38107d45	416	rc = server->ops->calc_signature(rqst, server);
3c1bf7e4 PS	417
	418	return rc;
	419	}
	420
	421	int
0b688cfc	422	smb2_verify_signature(struct smb_rqst rqst, struct TCP_Server_Info server)
3c1bf7e4 PS	423	{
	424	unsigned int rc;
	425	char server_response_sig[16];
738f9de5 PS	426	struct smb2_sync_hdr *shdr =
738f9de5 PS	427	(struct smb2_sync_hdr *)rqst->rq_iov[1].iov_base;
3c1bf7e4	428
31473fc4 PS	429	if ((shdr->Command == SMB2_NEGOTIATE) \|\|
	430	(shdr->Command == SMB2_SESSION_SETUP) \|\|
	431	(shdr->Command == SMB2_OPLOCK_BREAK) \|\|
3c1bf7e4 PS	432	(!server->session_estab))
	433	return 0;
	434
	435	/*
	436	* BB what if signatures are supposed to be on for session but
	437	* server does not send one? BB
	438	*/
	439
	440	/* Do not need to verify session setups with signature "BSRSPYL " */
31473fc4	441	if (memcmp(shdr->Signature, "BSRSPYL ", 8) == 0)
f96637be	442	cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n",
31473fc4	443	shdr->Command);
3c1bf7e4 PS	444
	445	/*
	446	* Save off the origiginal signature so we can modify the smb and check
	447	* our calculated signature against what the server sent.
	448	*/
31473fc4	449	memcpy(server_response_sig, shdr->Signature, SMB2_SIGNATURE_SIZE);
3c1bf7e4	450
31473fc4	451	memset(shdr->Signature, 0, SMB2_SIGNATURE_SIZE);
3c1bf7e4 PS	452
3c1bf7e4 PS	453	mutex_lock(&server->srv_mutex);
38107d45	454	rc = server->ops->calc_signature(rqst, server);
3c1bf7e4 PS	455	mutex_unlock(&server->srv_mutex);
	456
	457	if (rc)
	458	return rc;
	459
31473fc4	460	if (memcmp(server_response_sig, shdr->Signature, SMB2_SIGNATURE_SIZE))
3c1bf7e4 PS	461	return -EACCES;
	462	else
	463	return 0;
	464	}
	465
2dc7e1c0 PS	466	/*
	467	* Set message id for the request. Should be called after wait_for_free_request
	468	* and when srv_mutex is held.
	469	*/
	470	static inline void
31473fc4 PS	471	smb2_seq_num_into_buf(struct TCP_Server_Info *server,
31473fc4 PS	472	struct smb2_sync_hdr *shdr)
2dc7e1c0	473	{
31473fc4	474	unsigned int i, num = le16_to_cpu(shdr->CreditCharge);
cb7e9eab	475
31473fc4	476	shdr->MessageId = get_next_mid64(server);
cb7e9eab PS	477	/* skip message numbers according to CreditCharge field */
	478	for (i = 1; i < num; i++)
	479	get_next_mid(server);
2dc7e1c0 PS	480	}
	481
	482	static struct mid_q_entry *
31473fc4	483	smb2_mid_entry_alloc(const struct smb2_sync_hdr *shdr,
2dc7e1c0 PS	484	struct TCP_Server_Info *server)
	485	{
	486	struct mid_q_entry *temp;
	487
	488	if (server == NULL) {
f96637be	489	cifs_dbg(VFS, "Null TCP session in smb2_mid_entry_alloc\n");
2dc7e1c0 PS	490	return NULL;
	491	}
	492
	493	temp = mempool_alloc(cifs_mid_poolp, GFP_NOFS);
	494	if (temp == NULL)
	495	return temp;
	496	else {
	497	memset(temp, 0, sizeof(struct mid_q_entry));
31473fc4	498	temp->mid = le64_to_cpu(shdr->MessageId);
2dc7e1c0	499	temp->pid = current->pid;
31473fc4	500	temp->command = shdr->Command; /* Always LE */
2dc7e1c0 PS	501	temp->when_alloc = jiffies;
	502	temp->server = server;
	503
	504	/*
	505	* The default is for the mid to be synchronous, so the
	506	* default callback just wakes up the current task.
	507	*/
	508	temp->callback = cifs_wake_up_task;
	509	temp->callback_data = current;
	510	}
	511
	512	atomic_inc(&midCount);
	513	temp->mid_state = MID_REQUEST_ALLOCATED;
	514	return temp;
	515	}
	516
	517	static int
31473fc4	518	smb2_get_mid_entry(struct cifs_ses ses, struct smb2_sync_hdr shdr,
2dc7e1c0 PS	519	struct mid_q_entry **mid)
	520	{
	521	if (ses->server->tcpStatus == CifsExiting)
	522	return -ENOENT;
	523
	524	if (ses->server->tcpStatus == CifsNeedReconnect) {
f96637be	525	cifs_dbg(FYI, "tcp session dead - return to caller to retry\n");
2dc7e1c0 PS	526	return -EAGAIN;
	527	}
	528
7f48558e	529	if (ses->status == CifsNew) {
31473fc4 PS	530	if ((shdr->Command != SMB2_SESSION_SETUP) &&
31473fc4 PS	531	(shdr->Command != SMB2_NEGOTIATE))
2dc7e1c0 PS	532	return -EAGAIN;
	533	/* else ok - we are setting up session */
	534	}
7f48558e SP	535
7f48558e SP	536	if (ses->status == CifsExiting) {
31473fc4	537	if (shdr->Command != SMB2_LOGOFF)
7f48558e SP	538	return -EAGAIN;
	539	/* else ok - we are shutting down the session */
	540	}
	541
31473fc4	542	*mid = smb2_mid_entry_alloc(shdr, ses->server);
2dc7e1c0 PS	543	if (*mid == NULL)
	544	return -ENOMEM;
	545	spin_lock(&GlobalMid_Lock);
	546	list_add_tail(&(*mid)->qhead, &ses->server->pending_mid_q);
	547	spin_unlock(&GlobalMid_Lock);
	548	return 0;
	549	}
	550
	551	int
	552	smb2_check_receive(struct mid_q_entry mid, struct TCP_Server_Info server,
	553	bool log_error)
	554	{
	555	unsigned int len = get_rfc1002_length(mid->resp_buf);
738f9de5 PS	556	struct kvec iov[2];
	557	struct smb_rqst rqst = { .rq_iov = iov,
	558	.rq_nvec = 2 };
0b688cfc	559
738f9de5 PS	560	iov[0].iov_base = (char *)mid->resp_buf;
	561	iov[0].iov_len = 4;
	562	iov[1].iov_base = (char *)mid->resp_buf + 4;
	563	iov[1].iov_len = len;
2dc7e1c0 PS	564
	565	dump_smb(mid->resp_buf, min_t(u32, 80, len));
	566	/* convert the length into a more usable form */
4326ed2f	567	if (len > 24 && server->sign && !mid->decrypted) {
3c1bf7e4 PS	568	int rc;
3c1bf7e4 PS	569
0b688cfc	570	rc = smb2_verify_signature(&rqst, server);
3c1bf7e4	571	if (rc)
f96637be JP	572	cifs_dbg(VFS, "SMB signature verification returned error = %d\n",
f96637be JP	573	rc);
3c1bf7e4	574	}
2dc7e1c0 PS	575
	576	return map_smb2_to_linux_error(mid->resp_buf, log_error);
	577	}
	578
fec344e3 JL	579	struct mid_q_entry *
fec344e3 JL	580	smb2_setup_request(struct cifs_ses ses, struct smb_rqst rqst)
2dc7e1c0 PS	581	{
2dc7e1c0 PS	582	int rc;
738f9de5 PS	583	struct smb2_sync_hdr *shdr =
738f9de5 PS	584	(struct smb2_sync_hdr *)rqst->rq_iov[1].iov_base;
2dc7e1c0 PS	585	struct mid_q_entry *mid;
2dc7e1c0 PS	586
31473fc4	587	smb2_seq_num_into_buf(ses->server, shdr);
2dc7e1c0	588
31473fc4	589	rc = smb2_get_mid_entry(ses, shdr, &mid);
2dc7e1c0	590	if (rc)
fec344e3 JL	591	return ERR_PTR(rc);
	592	rc = smb2_sign_rqst(rqst, ses->server);
	593	if (rc) {
3c1bf7e4	594	cifs_delete_mid(mid);
fec344e3 JL	595	return ERR_PTR(rc);
	596	}
	597	return mid;
2dc7e1c0 PS	598	}
2dc7e1c0 PS	599
fec344e3 JL	600	struct mid_q_entry *
fec344e3 JL	601	smb2_setup_async_request(struct TCP_Server_Info server, struct smb_rqst rqst)
c95b8eed	602	{
fec344e3	603	int rc;
738f9de5 PS	604	struct smb2_sync_hdr *shdr =
738f9de5 PS	605	(struct smb2_sync_hdr *)rqst->rq_iov[1].iov_base;
c95b8eed PS	606	struct mid_q_entry *mid;
c95b8eed PS	607
31473fc4	608	smb2_seq_num_into_buf(server, shdr);
c95b8eed	609
31473fc4	610	mid = smb2_mid_entry_alloc(shdr, server);
c95b8eed	611	if (mid == NULL)
fec344e3	612	return ERR_PTR(-ENOMEM);
c95b8eed	613
fec344e3	614	rc = smb2_sign_rqst(rqst, server);
c95b8eed PS	615	if (rc) {
c95b8eed PS	616	DeleteMidQEntry(mid);
fec344e3	617	return ERR_PTR(rc);
3c1bf7e4 PS	618	}
3c1bf7e4 PS	619
fec344e3	620	return mid;
c95b8eed	621	}
026e93dc PS	622
	623	int
	624	smb3_crypto_aead_allocate(struct TCP_Server_Info *server)
	625	{
	626	struct crypto_aead *tfm;
	627
	628	if (!server->secmech.ccmaesencrypt) {
	629	tfm = crypto_alloc_aead("ccm(aes)", 0, 0);
	630	if (IS_ERR(tfm)) {
	631	cifs_dbg(VFS, "%s: Failed to alloc encrypt aead\n",
	632	__func__);
	633	return PTR_ERR(tfm);
	634	}
	635	server->secmech.ccmaesencrypt = tfm;
	636	}
	637
	638	if (!server->secmech.ccmaesdecrypt) {
	639	tfm = crypto_alloc_aead("ccm(aes)", 0, 0);
	640	if (IS_ERR(tfm)) {
	641	crypto_free_aead(server->secmech.ccmaesencrypt);
	642	server->secmech.ccmaesencrypt = NULL;
	643	cifs_dbg(VFS, "%s: Failed to alloc decrypt aead\n",
	644	__func__);
	645	return PTR_ERR(tfm);
	646	}
	647	server->secmech.ccmaesdecrypt = tfm;
	648	}
	649
	650	return 0;
	651	}