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-rw-r--r--fs/cifs/smb2transport.c331
1 files changed, 331 insertions, 0 deletions
diff --git a/fs/cifs/smb2transport.c b/fs/cifs/smb2transport.c
new file mode 100644
index 00000000000..8dd73e61d76
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+++ b/fs/cifs/smb2transport.c
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+/*
+ * 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 "smb2pdu.h"
+#include "cifsglob.h"
+#include "cifsproto.h"
+#include "smb2proto.h"
+#include "cifs_debug.h"
+#include "smb2status.h"
+#include "smb2glob.h"
+
+int
+smb2_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
+{
+ int i, rc;
+ unsigned char smb2_signature[SMB2_HMACSHA256_SIZE];
+ unsigned char *sigptr = smb2_signature;
+ struct kvec *iov = rqst->rq_iov;
+ int n_vec = rqst->rq_nvec;
+ struct smb2_hdr *smb2_pdu = (struct smb2_hdr *)iov[0].iov_base;
+
+ memset(smb2_signature, 0x0, SMB2_HMACSHA256_SIZE);
+ memset(smb2_pdu->Signature, 0x0, SMB2_SIGNATURE_SIZE);
+
+ rc = crypto_shash_setkey(server->secmech.hmacsha256,
+ server->session_key.response, SMB2_NTLMV2_SESSKEY_SIZE);
+ if (rc) {
+ cERROR(1, "%s: Could not update with response\n", __func__);
+ return rc;
+ }
+
+ rc = crypto_shash_init(&server->secmech.sdeschmacsha256->shash);
+ if (rc) {
+ cERROR(1, "%s: Could not init md5\n", __func__);
+ return rc;
+ }
+
+ for (i = 0; i < n_vec; i++) {
+ if (iov[i].iov_len == 0)
+ continue;
+ if (iov[i].iov_base == NULL) {
+ cERROR(1, "null iovec entry");
+ return -EIO;
+ }
+ /*
+ * The first entry includes a length field (which does not get
+ * signed that occupies the first 4 bytes before the header).
+ */
+ if (i == 0) {
+ if (iov[0].iov_len <= 8) /* cmd field at offset 9 */
+ break; /* nothing to sign or corrupt header */
+ rc =
+ crypto_shash_update(
+ &server->secmech.sdeschmacsha256->shash,
+ iov[i].iov_base + 4, iov[i].iov_len - 4);
+ } else {
+ rc =
+ crypto_shash_update(
+ &server->secmech.sdeschmacsha256->shash,
+ iov[i].iov_base, iov[i].iov_len);
+ }
+ if (rc) {
+ cERROR(1, "%s: Could not update with payload\n",
+ __func__);
+ return rc;
+ }
+ }
+
+ /* now hash over the rq_pages array */
+ for (i = 0; i < rqst->rq_npages; i++) {
+ struct kvec p_iov;
+
+ cifs_rqst_page_to_kvec(rqst, i, &p_iov);
+ crypto_shash_update(&server->secmech.sdeschmacsha256->shash,
+ p_iov.iov_base, p_iov.iov_len);
+ kunmap(rqst->rq_pages[i]);
+ }
+
+ rc = crypto_shash_final(&server->secmech.sdeschmacsha256->shash,
+ sigptr);
+ if (rc)
+ cERROR(1, "%s: Could not generate sha256 hash\n", __func__);
+
+ memcpy(smb2_pdu->Signature, sigptr, SMB2_SIGNATURE_SIZE);
+
+ return rc;
+}
+
+int
+smb3_calc_signature(struct smb_rqst *rqst, struct TCP_Server_Info *server)
+{
+ cFYI(1, "smb3 signatures not supported yet");
+ return -EOPNOTSUPP;
+}
+
+/* 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 *smb2_pdu = rqst->rq_iov[0].iov_base;
+
+ if (!(smb2_pdu->Flags & SMB2_FLAGS_SIGNED) ||
+ server->tcpStatus == CifsNeedNegotiate)
+ return rc;
+
+ if (!server->session_estab) {
+ strncpy(smb2_pdu->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_hdr *smb2_pdu = (struct smb2_hdr *)rqst->rq_iov[0].iov_base;
+
+ if ((smb2_pdu->Command == SMB2_NEGOTIATE) ||
+ (smb2_pdu->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(smb2_pdu->Signature, "BSRSPYL ", 8) == 0)
+ cFYI(1, "dummy signature received for smb command 0x%x",
+ smb2_pdu->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, smb2_pdu->Signature, SMB2_SIGNATURE_SIZE);
+
+ memset(smb2_pdu->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, smb2_pdu->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_hdr *hdr)
+{
+ hdr->MessageId = get_next_mid(server);
+}
+
+static struct mid_q_entry *
+smb2_mid_entry_alloc(const struct smb2_hdr *smb_buffer,
+ struct TCP_Server_Info *server)
+{
+ struct mid_q_entry *temp;
+
+ if (server == NULL) {
+ cERROR(1, "Null TCP session in smb2_mid_entry_alloc");
+ 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 = smb_buffer->MessageId; /* always LE */
+ temp->pid = current->pid;
+ temp->command = smb_buffer->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_hdr *buf,
+ struct mid_q_entry **mid)
+{
+ if (ses->server->tcpStatus == CifsExiting)
+ return -ENOENT;
+
+ if (ses->server->tcpStatus == CifsNeedReconnect) {
+ cFYI(1, "tcp session dead - return to caller to retry");
+ return -EAGAIN;
+ }
+
+ if (ses->status != CifsGood) {
+ /* check if SMB2 session is bad because we are setting it up */
+ if ((buf->Command != SMB2_SESSION_SETUP) &&
+ (buf->Command != SMB2_NEGOTIATE))
+ return -EAGAIN;
+ /* else ok - we are setting up session */
+ }
+ *mid = smb2_mid_entry_alloc(buf, 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;
+ struct smb_rqst rqst = { .rq_iov = &iov,
+ .rq_nvec = 1 };
+
+ iov.iov_base = (char *)mid->resp_buf;
+ iov.iov_len = get_rfc1002_length(mid->resp_buf) + 4;
+
+ dump_smb(mid->resp_buf, min_t(u32, 80, len));
+ /* convert the length into a more usable form */
+ if ((len > 24) &&
+ (server->sec_mode & (SECMODE_SIGN_REQUIRED|SECMODE_SIGN_ENABLED))) {
+ int rc;
+
+ rc = smb2_verify_signature(&rqst, server);
+ if (rc)
+ cERROR(1, "SMB signature verification returned error = "
+ "%d", 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_hdr *hdr = (struct smb2_hdr *)rqst->rq_iov[0].iov_base;
+ struct mid_q_entry *mid;
+
+ smb2_seq_num_into_buf(ses->server, hdr);
+
+ rc = smb2_get_mid_entry(ses, hdr, &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_hdr *hdr = (struct smb2_hdr *)rqst->rq_iov[0].iov_base;
+ struct mid_q_entry *mid;
+
+ smb2_seq_num_into_buf(server, hdr);
+
+ mid = smb2_mid_entry_alloc(hdr, server);
+ if (mid == NULL)
+ return ERR_PTR(-ENOMEM);
+
+ rc = smb2_sign_rqst(rqst, server);
+ if (rc) {
+ DeleteMidQEntry(mid);
+ return ERR_PTR(rc);
+ }
+
+ return mid;
+}