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![Pavel Shilovsky](/assets/img/avatar_default.png)
Allow to decrypt transformed packets, find a corresponding mid and process as usual further. Signed-off-by: Pavel Shilovsky <pshilov@microsoft.com>
651 lines
16 KiB
C
651 lines
16 KiB
C
/*
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* fs/cifs/smb2transport.c
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*
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* Copyright (C) International Business Machines Corp., 2002, 2011
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* Etersoft, 2012
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* Author(s): Steve French (sfrench@us.ibm.com)
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* Jeremy Allison (jra@samba.org) 2006
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* Pavel Shilovsky (pshilovsky@samba.org) 2012
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/fs.h>
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#include <linux/list.h>
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#include <linux/wait.h>
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#include <linux/net.h>
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#include <linux/delay.h>
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#include <linux/uaccess.h>
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#include <asm/processor.h>
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#include <linux/mempool.h>
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#include <linux/highmem.h>
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#include <crypto/aead.h>
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#include "smb2pdu.h"
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#include "cifsglob.h"
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#include "cifsproto.h"
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#include "smb2proto.h"
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#include "cifs_debug.h"
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#include "smb2status.h"
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#include "smb2glob.h"
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static int
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smb2_crypto_shash_allocate(struct TCP_Server_Info *server)
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{
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int rc;
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unsigned int size;
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if (server->secmech.sdeschmacsha256 != NULL)
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return 0; /* already allocated */
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server->secmech.hmacsha256 = crypto_alloc_shash("hmac(sha256)", 0, 0);
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if (IS_ERR(server->secmech.hmacsha256)) {
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cifs_dbg(VFS, "could not allocate crypto hmacsha256\n");
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rc = PTR_ERR(server->secmech.hmacsha256);
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server->secmech.hmacsha256 = NULL;
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return rc;
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}
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size = sizeof(struct shash_desc) +
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crypto_shash_descsize(server->secmech.hmacsha256);
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server->secmech.sdeschmacsha256 = kmalloc(size, GFP_KERNEL);
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if (!server->secmech.sdeschmacsha256) {
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crypto_free_shash(server->secmech.hmacsha256);
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server->secmech.hmacsha256 = NULL;
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return -ENOMEM;
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}
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server->secmech.sdeschmacsha256->shash.tfm = server->secmech.hmacsha256;
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server->secmech.sdeschmacsha256->shash.flags = 0x0;
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return 0;
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}
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static int
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smb3_crypto_shash_allocate(struct TCP_Server_Info *server)
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{
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unsigned int size;
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int rc;
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if (server->secmech.sdesccmacaes != NULL)
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return 0; /* already allocated */
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rc = smb2_crypto_shash_allocate(server);
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if (rc)
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return rc;
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server->secmech.cmacaes = crypto_alloc_shash("cmac(aes)", 0, 0);
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if (IS_ERR(server->secmech.cmacaes)) {
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cifs_dbg(VFS, "could not allocate crypto cmac-aes");
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kfree(server->secmech.sdeschmacsha256);
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server->secmech.sdeschmacsha256 = NULL;
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crypto_free_shash(server->secmech.hmacsha256);
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server->secmech.hmacsha256 = NULL;
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rc = PTR_ERR(server->secmech.cmacaes);
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server->secmech.cmacaes = NULL;
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return rc;
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}
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size = sizeof(struct shash_desc) +
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crypto_shash_descsize(server->secmech.cmacaes);
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server->secmech.sdesccmacaes = kmalloc(size, GFP_KERNEL);
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if (!server->secmech.sdesccmacaes) {
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cifs_dbg(VFS, "%s: Can't alloc cmacaes\n", __func__);
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kfree(server->secmech.sdeschmacsha256);
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server->secmech.sdeschmacsha256 = NULL;
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crypto_free_shash(server->secmech.hmacsha256);
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crypto_free_shash(server->secmech.cmacaes);
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server->secmech.hmacsha256 = NULL;
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server->secmech.cmacaes = NULL;
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return -ENOMEM;
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}
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server->secmech.sdesccmacaes->shash.tfm = server->secmech.cmacaes;
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server->secmech.sdesccmacaes->shash.flags = 0x0;
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return 0;
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}
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struct cifs_ses *
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smb2_find_smb_ses(struct TCP_Server_Info *server, __u64 ses_id)
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{
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struct cifs_ses *ses;
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spin_lock(&cifs_tcp_ses_lock);
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list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
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if (ses->Suid != ses_id)
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continue;
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spin_unlock(&cifs_tcp_ses_lock);
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return ses;
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}
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spin_unlock(&cifs_tcp_ses_lock);
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return NULL;
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}
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int
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smb2_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
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{
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int rc;
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unsigned char smb2_signature[SMB2_HMACSHA256_SIZE];
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unsigned char *sigptr = smb2_signature;
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struct kvec *iov = rqst->rq_iov;
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struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)iov[1].iov_base;
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struct cifs_ses *ses;
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ses = smb2_find_smb_ses(server, shdr->SessionId);
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if (!ses) {
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cifs_dbg(VFS, "%s: Could not find session\n", __func__);
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return 0;
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}
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memset(smb2_signature, 0x0, SMB2_HMACSHA256_SIZE);
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memset(shdr->Signature, 0x0, SMB2_SIGNATURE_SIZE);
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rc = smb2_crypto_shash_allocate(server);
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if (rc) {
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cifs_dbg(VFS, "%s: shah256 alloc failed\n", __func__);
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return rc;
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}
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rc = crypto_shash_setkey(server->secmech.hmacsha256,
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ses->auth_key.response, SMB2_NTLMV2_SESSKEY_SIZE);
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if (rc) {
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cifs_dbg(VFS, "%s: Could not update with response\n", __func__);
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return rc;
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}
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rc = crypto_shash_init(&server->secmech.sdeschmacsha256->shash);
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if (rc) {
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cifs_dbg(VFS, "%s: Could not init sha256", __func__);
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return rc;
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}
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rc = __cifs_calc_signature(rqst, server, sigptr,
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&server->secmech.sdeschmacsha256->shash);
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if (!rc)
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memcpy(shdr->Signature, sigptr, SMB2_SIGNATURE_SIZE);
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return rc;
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}
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static int generate_key(struct cifs_ses *ses, struct kvec label,
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struct kvec context, __u8 *key, unsigned int key_size)
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{
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unsigned char zero = 0x0;
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__u8 i[4] = {0, 0, 0, 1};
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__u8 L[4] = {0, 0, 0, 128};
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int rc = 0;
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unsigned char prfhash[SMB2_HMACSHA256_SIZE];
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unsigned char *hashptr = prfhash;
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memset(prfhash, 0x0, SMB2_HMACSHA256_SIZE);
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memset(key, 0x0, key_size);
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rc = smb3_crypto_shash_allocate(ses->server);
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if (rc) {
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cifs_dbg(VFS, "%s: crypto alloc failed\n", __func__);
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goto smb3signkey_ret;
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}
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rc = crypto_shash_setkey(ses->server->secmech.hmacsha256,
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ses->auth_key.response, SMB2_NTLMV2_SESSKEY_SIZE);
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if (rc) {
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cifs_dbg(VFS, "%s: Could not set with session key\n", __func__);
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goto smb3signkey_ret;
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}
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rc = crypto_shash_init(&ses->server->secmech.sdeschmacsha256->shash);
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if (rc) {
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cifs_dbg(VFS, "%s: Could not init sign hmac\n", __func__);
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goto smb3signkey_ret;
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}
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rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
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i, 4);
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if (rc) {
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cifs_dbg(VFS, "%s: Could not update with n\n", __func__);
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goto smb3signkey_ret;
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}
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rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
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label.iov_base, label.iov_len);
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if (rc) {
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cifs_dbg(VFS, "%s: Could not update with label\n", __func__);
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goto smb3signkey_ret;
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}
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rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
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&zero, 1);
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if (rc) {
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cifs_dbg(VFS, "%s: Could not update with zero\n", __func__);
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goto smb3signkey_ret;
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}
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rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
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context.iov_base, context.iov_len);
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if (rc) {
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cifs_dbg(VFS, "%s: Could not update with context\n", __func__);
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goto smb3signkey_ret;
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}
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rc = crypto_shash_update(&ses->server->secmech.sdeschmacsha256->shash,
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L, 4);
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if (rc) {
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cifs_dbg(VFS, "%s: Could not update with L\n", __func__);
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goto smb3signkey_ret;
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}
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rc = crypto_shash_final(&ses->server->secmech.sdeschmacsha256->shash,
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hashptr);
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if (rc) {
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cifs_dbg(VFS, "%s: Could not generate sha256 hash\n", __func__);
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goto smb3signkey_ret;
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}
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memcpy(key, hashptr, key_size);
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smb3signkey_ret:
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return rc;
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}
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struct derivation {
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struct kvec label;
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struct kvec context;
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};
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struct derivation_triplet {
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struct derivation signing;
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struct derivation encryption;
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struct derivation decryption;
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};
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static int
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generate_smb3signingkey(struct cifs_ses *ses,
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const struct derivation_triplet *ptriplet)
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{
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int rc;
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rc = generate_key(ses, ptriplet->signing.label,
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ptriplet->signing.context, ses->smb3signingkey,
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SMB3_SIGN_KEY_SIZE);
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if (rc)
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return rc;
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rc = generate_key(ses, ptriplet->encryption.label,
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ptriplet->encryption.context, ses->smb3encryptionkey,
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SMB3_SIGN_KEY_SIZE);
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if (rc)
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return rc;
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return generate_key(ses, ptriplet->decryption.label,
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ptriplet->decryption.context,
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ses->smb3decryptionkey, SMB3_SIGN_KEY_SIZE);
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}
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int
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generate_smb30signingkey(struct cifs_ses *ses)
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{
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struct derivation_triplet triplet;
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struct derivation *d;
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d = &triplet.signing;
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d->label.iov_base = "SMB2AESCMAC";
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d->label.iov_len = 12;
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d->context.iov_base = "SmbSign";
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d->context.iov_len = 8;
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d = &triplet.encryption;
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d->label.iov_base = "SMB2AESCCM";
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d->label.iov_len = 11;
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d->context.iov_base = "ServerIn ";
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d->context.iov_len = 10;
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d = &triplet.decryption;
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d->label.iov_base = "SMB2AESCCM";
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d->label.iov_len = 11;
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d->context.iov_base = "ServerOut";
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d->context.iov_len = 10;
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return generate_smb3signingkey(ses, &triplet);
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}
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int
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generate_smb311signingkey(struct cifs_ses *ses)
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{
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struct derivation_triplet triplet;
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struct derivation *d;
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d = &triplet.signing;
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d->label.iov_base = "SMB2AESCMAC";
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d->label.iov_len = 12;
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d->context.iov_base = "SmbSign";
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d->context.iov_len = 8;
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d = &triplet.encryption;
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d->label.iov_base = "SMB2AESCCM";
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d->label.iov_len = 11;
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d->context.iov_base = "ServerIn ";
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d->context.iov_len = 10;
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d = &triplet.decryption;
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d->label.iov_base = "SMB2AESCCM";
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d->label.iov_len = 11;
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d->context.iov_base = "ServerOut";
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d->context.iov_len = 10;
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return generate_smb3signingkey(ses, &triplet);
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}
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int
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smb3_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
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{
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int rc = 0;
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unsigned char smb3_signature[SMB2_CMACAES_SIZE];
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unsigned char *sigptr = smb3_signature;
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struct kvec *iov = rqst->rq_iov;
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struct smb2_sync_hdr *shdr = (struct smb2_sync_hdr *)iov[1].iov_base;
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struct cifs_ses *ses;
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ses = smb2_find_smb_ses(server, shdr->SessionId);
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if (!ses) {
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cifs_dbg(VFS, "%s: Could not find session\n", __func__);
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return 0;
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}
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memset(smb3_signature, 0x0, SMB2_CMACAES_SIZE);
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memset(shdr->Signature, 0x0, SMB2_SIGNATURE_SIZE);
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rc = crypto_shash_setkey(server->secmech.cmacaes,
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ses->smb3signingkey, SMB2_CMACAES_SIZE);
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if (rc) {
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cifs_dbg(VFS, "%s: Could not set key for cmac aes\n", __func__);
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return rc;
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}
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/*
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* we already allocate sdesccmacaes when we init smb3 signing key,
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* so unlike smb2 case we do not have to check here if secmech are
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* initialized
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*/
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rc = crypto_shash_init(&server->secmech.sdesccmacaes->shash);
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if (rc) {
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cifs_dbg(VFS, "%s: Could not init cmac aes\n", __func__);
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return rc;
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}
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rc = __cifs_calc_signature(rqst, server, sigptr,
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&server->secmech.sdesccmacaes->shash);
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if (!rc)
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memcpy(shdr->Signature, sigptr, SMB2_SIGNATURE_SIZE);
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return rc;
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}
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/* must be called with server->srv_mutex held */
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static int
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smb2_sign_rqst(struct smb_rqst *rqst, struct TCP_Server_Info *server)
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{
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int rc = 0;
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struct smb2_sync_hdr *shdr =
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(struct smb2_sync_hdr *)rqst->rq_iov[1].iov_base;
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if (!(shdr->Flags & SMB2_FLAGS_SIGNED) ||
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server->tcpStatus == CifsNeedNegotiate)
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return rc;
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if (!server->session_estab) {
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strncpy(shdr->Signature, "BSRSPYL", 8);
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return rc;
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}
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rc = server->ops->calc_signature(rqst, server);
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return rc;
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}
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int
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smb2_verify_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
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{
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unsigned int rc;
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char server_response_sig[16];
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struct smb2_sync_hdr *shdr =
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(struct smb2_sync_hdr *)rqst->rq_iov[1].iov_base;
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if ((shdr->Command == SMB2_NEGOTIATE) ||
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(shdr->Command == SMB2_SESSION_SETUP) ||
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(shdr->Command == SMB2_OPLOCK_BREAK) ||
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(!server->session_estab))
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return 0;
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/*
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* BB what if signatures are supposed to be on for session but
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* server does not send one? BB
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*/
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/* Do not need to verify session setups with signature "BSRSPYL " */
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if (memcmp(shdr->Signature, "BSRSPYL ", 8) == 0)
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cifs_dbg(FYI, "dummy signature received for smb command 0x%x\n",
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shdr->Command);
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/*
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* Save off the origiginal signature so we can modify the smb and check
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* our calculated signature against what the server sent.
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*/
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memcpy(server_response_sig, shdr->Signature, SMB2_SIGNATURE_SIZE);
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memset(shdr->Signature, 0, SMB2_SIGNATURE_SIZE);
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mutex_lock(&server->srv_mutex);
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rc = server->ops->calc_signature(rqst, server);
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mutex_unlock(&server->srv_mutex);
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if (rc)
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return rc;
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if (memcmp(server_response_sig, shdr->Signature, SMB2_SIGNATURE_SIZE))
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return -EACCES;
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else
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return 0;
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}
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/*
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* Set message id for the request. Should be called after wait_for_free_request
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* and when srv_mutex is held.
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*/
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static inline void
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smb2_seq_num_into_buf(struct TCP_Server_Info *server,
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struct smb2_sync_hdr *shdr)
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{
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unsigned int i, num = le16_to_cpu(shdr->CreditCharge);
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shdr->MessageId = get_next_mid64(server);
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/* skip message numbers according to CreditCharge field */
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for (i = 1; i < num; i++)
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get_next_mid(server);
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|
}
|
|
|
|
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;
|
|
}
|