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smb2pdu.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2016 Namjae Jeon <[email protected]>
* Copyright (C) 2018 Samsung Electronics Co., Ltd.
*/
#include <linux/inetdevice.h>
#include <net/addrconf.h>
#include <linux/syscalls.h>
#include "glob.h"
#include "smb2pdu.h"
#include "smbfsctl.h"
#include "oplock.h"
#include "cifsacl.h"
#include "auth.h"
#include "asn1.h"
#include "encrypt.h"
#include "buffer_pool.h"
#include "transport_tcp.h"
#include "transport_ipc.h"
#include "vfs.h"
#include "vfs_cache.h"
#include "misc.h"
#include "time_wrappers.h"
#include "server.h"
#include "smb_common.h"
#include "mgmt/user_config.h"
#include "mgmt/share_config.h"
#include "mgmt/tree_connect.h"
#include "mgmt/user_session.h"
#include "mgmt/cifsd_ida.h"
bool multi_channel_enable;
bool encryption_enable;
bool stream_file_enable;
/**
* check_session_id() - check for valid session id in smb header
* @conn: TCP server instance of connection
* @id: session id from smb header
*
* Return: 1 if valid session id, otherwise 0
*/
static inline int check_session_id(struct cifsd_tcp_conn *conn, uint64_t id)
{
struct cifsd_session *sess;
if (id == 0 || id == -1)
return 0;
sess = cifsd_session_lookup(conn, id);
if (sess)
return 1;
cifsd_err("Invalid user session id: %llu\n", id);
return 0;
}
struct channel *lookup_chann_list(struct cifsd_session *sess)
{
struct channel *chann;
struct list_head *t;
list_for_each(t, &sess->cifsd_chann_list) {
chann = list_entry(t, struct channel, chann_list);
if (chann && chann->conn == sess->conn)
return chann;
}
return NULL;
}
/**
* smb2_get_cifsd_tcon() - get tree connection information for a tree id
* @sess: session containing tree list
* @tid: match tree connection with tree id
*
* Return: matching tree connection on success, otherwise error
*/
int smb2_get_cifsd_tcon(struct cifsd_work *work)
{
struct smb2_hdr *req_hdr = (struct smb2_hdr *)REQUEST_BUF(work);
int tree_id;
work->tcon = NULL;
if ((work->conn->ops->get_cmd_val(work) == SMB2_TREE_CONNECT_HE) ||
(work->conn->ops->get_cmd_val(work) == SMB2_CANCEL_HE) ||
(work->conn->ops->get_cmd_val(work) == SMB2_LOGOFF_HE)) {
cifsd_debug("skip to check tree connect request\n");
return 0;
}
if (list_empty(&work->sess->tree_conn_list)) {
cifsd_debug("NO tree connected\n");
return -1;
}
tree_id = le32_to_cpu(req_hdr->Id.SyncId.TreeId);
work->tcon = cifsd_tree_conn_lookup(work->sess, tree_id);
if (!work->tcon) {
cifsd_err("Invalid tid %d\n", tree_id);
return -1;
}
return 1;
}
/**
* smb2_set_err_rsp() - set error response code on smb response
* @work: smb work containing response buffer
*/
void smb2_set_err_rsp(struct cifsd_work *work)
{
char *rsp = RESPONSE_BUF(work);
struct smb2_err_rsp *err_rsp;
if (work->next_smb2_rcv_hdr_off)
err_rsp = (struct smb2_err_rsp *)((char *)rsp +
work->next_smb2_rsp_hdr_off);
else
err_rsp = (struct smb2_err_rsp *)rsp;
if (err_rsp->hdr.Status != cpu_to_le32(STATUS_STOPPED_ON_SYMLINK)) {
err_rsp->StructureSize =
cpu_to_le16(SMB2_ERROR_STRUCTURE_SIZE2);
err_rsp->ErrorContextCount = 0;
err_rsp->Reserved = 0;
err_rsp->ByteCount = 0;
err_rsp->ErrorData[0] = 0;
inc_rfc1001_len(rsp, SMB2_ERROR_STRUCTURE_SIZE2);
}
}
/**
* is_smb2_neg_cmd() - is it smb2 negotiation command
* @work: smb work containing smb header
*
* Return: 1 if smb2 negotiation command, otherwise 0
*/
int is_smb2_neg_cmd(struct cifsd_work *work)
{
struct smb2_hdr *hdr = (struct smb2_hdr *)REQUEST_BUF(work);
/* is it SMB2 header ? */
if (hdr->ProtocolId != SMB2_PROTO_NUMBER)
return 0;
/* make sure it is request not response message */
if (hdr->Flags & SMB2_FLAGS_SERVER_TO_REDIR)
return 0;
if (hdr->Command != SMB2_NEGOTIATE)
return 0;
return 1;
}
/**
* is_smb2_rsp() - is it smb2 response
* @work: smb work containing smb response buffer
*
* Return: 1 if smb2 response, otherwise 0
*/
int is_smb2_rsp(struct cifsd_work *work)
{
struct smb2_hdr *hdr = (struct smb2_hdr *)RESPONSE_BUF(work);
/* is it SMB2 header ? */
if (hdr->ProtocolId != SMB2_PROTO_NUMBER)
return 0;
/* make sure it is response not request message */
if (!(hdr->Flags & SMB2_FLAGS_SERVER_TO_REDIR))
return 0;
return 1;
}
/**
* get_smb2_cmd_val() - get smb command code from smb header
* @work: smb work containing smb request buffer
*
* Return: smb2 request command value
*/
int get_smb2_cmd_val(struct cifsd_work *work)
{
struct smb2_hdr *rcv_hdr = (struct smb2_hdr *)REQUEST_BUF(work);
if (work->next_smb2_rcv_hdr_off)
rcv_hdr = (struct smb2_hdr *)((char *)rcv_hdr
+ work->next_smb2_rcv_hdr_off);
return le16_to_cpu(rcv_hdr->Command);
}
/**
* set_smb2_rsp_status() - set error response code on smb2 header
* @work: smb work containing response buffer
*/
void set_smb2_rsp_status(struct cifsd_work *work, __le32 err)
{
struct smb2_hdr *rsp_hdr = (struct smb2_hdr *) RESPONSE_BUF(work);
if (work->next_smb2_rcv_hdr_off)
rsp_hdr = (struct smb2_hdr *)((char *)rsp_hdr
+ work->next_smb2_rsp_hdr_off);
rsp_hdr->Status = err;
smb2_set_err_rsp(work);
}
/**
* init_smb2_neg_rsp() - initialize smb2 response for negotiate command
* @work: smb work containing smb request buffer
*
* smb2 negotiate response is sent in reply of smb1 negotiate command for
* dialect auto-negotiation.
*/
int init_smb2_neg_rsp(struct cifsd_work *work)
{
struct smb2_hdr *rsp_hdr;
struct smb2_negotiate_rsp *rsp;
struct cifsd_tcp_conn *conn = work->conn;
if (!conn->need_neg)
return -EINVAL;
if (!(conn->dialect >= SMB20_PROT_ID &&
conn->dialect <= SMB311_PROT_ID))
return -EINVAL;
rsp_hdr = (struct smb2_hdr *)RESPONSE_BUF(work);
memset(rsp_hdr, 0, sizeof(struct smb2_hdr) + 2);
rsp_hdr->smb2_buf_length =
cpu_to_be32(HEADER_SIZE_NO_BUF_LEN(conn));
rsp_hdr->ProtocolId = SMB2_PROTO_NUMBER;
rsp_hdr->StructureSize = SMB2_HEADER_STRUCTURE_SIZE;
rsp_hdr->CreditRequest = cpu_to_le16(2);
rsp_hdr->Command = SMB2_NEGOTIATE;
rsp_hdr->Flags = (SMB2_FLAGS_SERVER_TO_REDIR);
rsp_hdr->NextCommand = 0;
rsp_hdr->MessageId = 0;
rsp_hdr->Id.SyncId.ProcessId = 0;
rsp_hdr->Id.SyncId.TreeId = 0;
rsp_hdr->SessionId = 0;
memset(rsp_hdr->Signature, 0, 16);
rsp = (struct smb2_negotiate_rsp *)RESPONSE_BUF(work);
WARN_ON(cifsd_tcp_good(work));
rsp->StructureSize = cpu_to_le16(65);
cifsd_debug("conn->dialect 0x%x\n", conn->dialect);
rsp->DialectRevision = cpu_to_le16(conn->dialect);
/* Not setting conn guid rsp->ServerGUID, as it
* not used by client for identifying connection
*/
rsp->Capabilities = 0;
/* Default Max Message Size till SMB2.0, 64K*/
rsp->MaxTransactSize = cpu_to_le32(cifsd_max_msg_size());
rsp->MaxReadSize = cpu_to_le32(cifsd_max_msg_size());
rsp->MaxWriteSize = cpu_to_le32(cifsd_max_msg_size());
rsp->SystemTime = cpu_to_le64(cifsd_systime());
rsp->ServerStartTime = 0;
rsp->SecurityBufferOffset = cpu_to_le16(128);
rsp->SecurityBufferLength = cpu_to_le16(AUTH_GSS_LENGTH);
cifsd_copy_gss_neg_header(((char *)(&rsp->hdr) +
sizeof(rsp->hdr.smb2_buf_length)) +
le16_to_cpu(rsp->SecurityBufferOffset));
inc_rfc1001_len(rsp, sizeof(struct smb2_negotiate_rsp) -
sizeof(struct smb2_hdr) - sizeof(rsp->Buffer) +
AUTH_GSS_LENGTH);
rsp->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED_LE;
conn->use_spnego = true;
cifsd_tcp_set_need_negotiate(work);
return 0;
}
/**
* init_chained_smb2_rsp() - initialize smb2 chained response
* @work: smb work containing smb response buffer
*/
static void init_chained_smb2_rsp(struct cifsd_work *work)
{
struct smb2_hdr *req;
struct smb2_hdr *rsp;
struct smb2_hdr *rsp_hdr;
struct smb2_hdr *rcv_hdr;
int next_hdr_offset = 0;
int len, new_len;
req = (struct smb2_hdr *)(REQUEST_BUF(work) +
work->next_smb2_rcv_hdr_off);
rsp = (struct smb2_hdr *)(RESPONSE_BUF(work) +
work->next_smb2_rsp_hdr_off);
/* Len of this response = updated RFC len - offset of previous cmd
* in the compound rsp
*/
/* Storing the current local FID which may be needed by subsequent
* command in the compound request
*/
if (req->Command == SMB2_CREATE && rsp->Status == STATUS_SUCCESS) {
work->compound_fid =
le64_to_cpu(((struct smb2_create_rsp *)rsp)->
VolatileFileId);
work->compound_pfid =
le64_to_cpu(((struct smb2_create_rsp *)rsp)->
PersistentFileId);
work->compound_sid = le64_to_cpu(rsp->SessionId);
}
len = get_rfc1002_length(RESPONSE_BUF(work)) -
work->next_smb2_rsp_hdr_off;
next_hdr_offset = le32_to_cpu(req->NextCommand);
/* Align the length to 8Byte */
new_len = ((len + 7) & ~7);
inc_rfc1001_len(RESPONSE_BUF(work), ((sizeof(struct smb2_hdr) - 4)
+ new_len - len));
rsp->NextCommand = cpu_to_le32(new_len);
work->next_smb2_rcv_hdr_off += next_hdr_offset;
work->next_smb2_rsp_hdr_off += new_len;
cifsd_debug("Compound req new_len = %d rcv off = %d rsp off = %d\n",
new_len, work->next_smb2_rcv_hdr_off,
work->next_smb2_rsp_hdr_off);
rsp_hdr = (struct smb2_hdr *)(((char *)RESPONSE_BUF(work) +
work->next_smb2_rsp_hdr_off));
rcv_hdr = (struct smb2_hdr *)(((char *)REQUEST_BUF(work) +
work->next_smb2_rcv_hdr_off));
if (!(rcv_hdr->Flags & SMB2_FLAGS_RELATED_OPERATIONS)) {
cifsd_debug("related flag should be set\n");
work->compound_fid = CIFSD_NO_FID;
work->compound_pfid = CIFSD_NO_FID;
}
memset((char *)rsp_hdr + 4, 0, sizeof(struct smb2_hdr) + 2);
rsp_hdr->ProtocolId = rcv_hdr->ProtocolId;
rsp_hdr->StructureSize = SMB2_HEADER_STRUCTURE_SIZE;
rsp_hdr->CreditRequest = rcv_hdr->CreditRequest;
rsp_hdr->Command = rcv_hdr->Command;
/*
* Message is response. We don't grant oplock yet.
*/
rsp_hdr->Flags = (SMB2_FLAGS_SERVER_TO_REDIR |
SMB2_FLAGS_RELATED_OPERATIONS);
rsp_hdr->NextCommand = 0;
rsp_hdr->MessageId = rcv_hdr->MessageId;
rsp_hdr->Id.SyncId.ProcessId = rcv_hdr->Id.SyncId.ProcessId;
rsp_hdr->Id.SyncId.TreeId = rcv_hdr->Id.SyncId.TreeId;
rsp_hdr->SessionId = rcv_hdr->SessionId;
memcpy(rsp_hdr->Signature, rcv_hdr->Signature, 16);
}
/**
* is_chained_smb2_message() - check for chained command
* @work: smb work containing smb request buffer
*
* Return: true if chained request, otherwise false
*/
bool is_chained_smb2_message(struct cifsd_work *work)
{
struct smb2_hdr *hdr = (struct smb2_hdr *)REQUEST_BUF(work);
unsigned int len;
if (hdr->ProtocolId != SMB2_PROTO_NUMBER)
return false;
hdr = (struct smb2_hdr *)(REQUEST_BUF(work) +
work->next_smb2_rcv_hdr_off);
if (le32_to_cpu(hdr->NextCommand) > 0) {
cifsd_debug("got SMB2 chained command\n");
init_chained_smb2_rsp(work);
return true;
} else if (work->next_smb2_rcv_hdr_off) {
/*
* This is last request in chained command,
* align response to 8 byte
*/
len = ((get_rfc1002_length(RESPONSE_BUF(work)) + 7) & ~7);
len = len - get_rfc1002_length(RESPONSE_BUF(work));
if (len) {
cifsd_debug("padding len %u\n", len);
inc_rfc1001_len(RESPONSE_BUF(work), len);
if (HAS_AUX_PAYLOAD(work))
work->aux_payload_sz += len;
}
}
return false;
}
/**
* init_smb2_rsp_hdr() - initialize smb2 response
* @work: smb work containing smb request buffer
*
* Return: 0
*/
int init_smb2_rsp_hdr(struct cifsd_work *work)
{
struct smb2_hdr *rsp_hdr = (struct smb2_hdr *)RESPONSE_BUF(work);
struct smb2_hdr *rcv_hdr = (struct smb2_hdr *)REQUEST_BUF(work);
struct cifsd_tcp_conn *conn = work->conn;
int next_hdr_offset = 0;
next_hdr_offset = le32_to_cpu(rcv_hdr->NextCommand);
memset(rsp_hdr, 0, sizeof(struct smb2_hdr) + 2);
rsp_hdr->smb2_buf_length = cpu_to_be32(HEADER_SIZE_NO_BUF_LEN(conn));
rsp_hdr->ProtocolId = rcv_hdr->ProtocolId;
rsp_hdr->StructureSize = SMB2_HEADER_STRUCTURE_SIZE;
rsp_hdr->CreditRequest = rcv_hdr->CreditRequest;
rsp_hdr->Command = rcv_hdr->Command;
/*
* Message is response. We don't grant oplock yet.
*/
rsp_hdr->Flags = (SMB2_FLAGS_SERVER_TO_REDIR);
if (next_hdr_offset)
rsp_hdr->NextCommand = cpu_to_le32(next_hdr_offset);
else
rsp_hdr->NextCommand = 0;
rsp_hdr->MessageId = rcv_hdr->MessageId;
rsp_hdr->Id.SyncId.ProcessId = rcv_hdr->Id.SyncId.ProcessId;
rsp_hdr->Id.SyncId.TreeId = rcv_hdr->Id.SyncId.TreeId;
rsp_hdr->SessionId = rcv_hdr->SessionId;
memcpy(rsp_hdr->Signature, rcv_hdr->Signature, 16);
if (conn->credits_granted) {
if (le16_to_cpu(rcv_hdr->CreditCharge))
conn->credits_granted -=
le16_to_cpu(rcv_hdr->CreditCharge);
else
conn->credits_granted -= 1;
}
work->type = SYNC;
if (work->async_id) {
cifds_release_id(conn->async_ida, work->async_id);
work->async_id = 0;
}
return 0;
}
/**
* smb2_allocate_rsp_buf() - allocate smb2 response buffer
* @work: smb work containing smb request buffer
*
* Return: 0 on success, otherwise -ENOMEM
*/
int smb2_allocate_rsp_buf(struct cifsd_work *work)
{
struct smb2_hdr *hdr = (struct smb2_hdr *)REQUEST_BUF(work);
struct smb2_query_info_req *req;
size_t small_sz = cifsd_small_buffer_size();
size_t large_sz = cifsd_max_msg_size() + MAX_SMB2_HDR_SIZE;
size_t sz = small_sz;
int cmd = le16_to_cpu(hdr->Command);
req = (struct smb2_query_info_req *)REQUEST_BUF(work);
if (cmd == SMB2_IOCTL_HE || cmd == SMB2_QUERY_DIRECTORY_HE)
sz = large_sz;
if (cmd == SMB2_QUERY_INFO_HE) {
if (req->InfoType == SMB2_O_INFO_FILE &&
(req->FileInfoClass == FILE_FULL_EA_INFORMATION ||
req->FileInfoClass == FILE_ALL_INFORMATION))
sz = large_sz;
}
/* allocate large response buf for chained commands */
if (le32_to_cpu(hdr->NextCommand) > 0)
sz = large_sz;
work->response_buf = cifsd_alloc_response(sz);
work->response_sz = sz;
if (!RESPONSE_BUF(work)) {
cifsd_err("Failed to allocate %zu bytes buffer\n", sz);
return -ENOMEM;
}
return 0;
}
/**
* smb2_set_rsp_credits() - set number of credits in response buffer
* @work: smb work containing smb response buffer
*/
void smb2_set_rsp_credits(struct cifsd_work *work)
{
struct smb2_hdr *hdr = (struct smb2_hdr *)RESPONSE_BUF(work);
struct cifsd_tcp_conn *conn = work->conn;
unsigned int status = le32_to_cpu(hdr->Status);
unsigned int flags = hdr->Flags;
unsigned short credits_requested = le16_to_cpu(hdr->CreditRequest);
unsigned short cmd = le16_to_cpu(hdr->Command);
unsigned short credit_charge = 1, credits_granted = 0;
unsigned short aux_max, aux_credits, min_credits;
BUG_ON(conn->credits_granted >= conn->max_credits);
/* get default minimum credits by shifting maximum credits by 4 */
min_credits = conn->max_credits >> 4;
if (flags & SMB2_FLAGS_ASYNC_COMMAND) {
credits_granted = 0;
} else if (credits_requested > 0) {
aux_max = 0;
aux_credits = credits_requested - 1;
switch (cmd) {
case SMB2_NEGOTIATE:
break;
case SMB2_SESSION_SETUP:
aux_max = (status) ? 0 : 32;
break;
default:
aux_max = 32;
break;
}
aux_credits = (aux_credits < aux_max) ? aux_credits : aux_max;
credits_granted = aux_credits + credit_charge;
/* if credits granted per client is getting bigger than default
* minimum credits then we should wrap it up within the limits.
*/
if ((conn->credits_granted + credits_granted) > min_credits)
credits_granted = min_credits - conn->credits_granted;
} else if (conn->credits_granted == 0) {
credits_granted = 1;
}
conn->credits_granted += credits_granted;
cifsd_debug("credits: requested[%d] granted[%d] total_granted[%d]\n",
credits_requested, credits_granted,
conn->credits_granted);
/* set number of credits granted in SMB2 hdr */
hdr->CreditRequest = cpu_to_le16(credits_granted);
}
/**
* smb2_check_user_session() - check for valid session for a user
* @work: smb work containing smb request buffer
*
* Return: 0 on success, otherwise error
*/
int smb2_check_user_session(struct cifsd_work *work)
{
struct smb2_hdr *req_hdr = (struct smb2_hdr *)REQUEST_BUF(work);
struct cifsd_tcp_conn *conn = work->conn;
unsigned int cmd = conn->ops->get_cmd_val(work);
unsigned long long sess_id;
work->sess = NULL;
/*
* ECHO, KEEP_ALIVE, SMB2_NEGOTIATE, SMB2_SESSION_SETUP command does not
* require a session id, so no need to validate user session's for these
* commands.
*/
if (cmd == SMB2_ECHO_HE || cmd == SMB2_NEGOTIATE_HE ||
cmd == SMB2_SESSION_SETUP_HE)
return 0;
if (!cifsd_tcp_good(work))
return -EINVAL;
sess_id = le64_to_cpu(req_hdr->SessionId);
/* Check for validity of user session */
work->sess = cifsd_session_lookup(conn, sess_id);
if (work->sess)
return 1;
cifsd_debug("Invalid user session, Uid %llu\n", sess_id);
return -EINVAL;
}
static void destroy_previous_session(uint64_t id)
{
cifsd_session_destroy(cifsd_session_lookup_slowpath(id));
}
/**
* smb2_get_name() - get filename string from on the wire smb format
* @src: source buffer
* @maxlen: maxlen of source string
* @work: smb work containing smb request buffer
*
* Return: matching converted filename on success, otherwise error ptr
*/
static char *
smb2_get_name(struct cifsd_share_config *share,
const char *src,
const int maxlen,
struct nls_table *local_nls)
{
char *name, *unixname;
name = smb_strndup_from_utf16(src, maxlen, 1,
local_nls);
if (IS_ERR(name)) {
cifsd_err("failed to get name %ld\n", PTR_ERR(name));
return name;
}
/* change it to absolute unix name */
cifsd_conv_path_to_unix(name);
unixname = convert_to_unix_name(share, name);
kfree(name);
if (!unixname) {
cifsd_err("can not convert absolute name\n");
return ERR_PTR(-ENOMEM);
}
cifsd_debug("absoulte name = %s\n", unixname);
return unixname;
}
/**
* smb2_put_name() - free memory allocated for filename
* @name: filename pointer to be freed
*/
static void smb2_put_name(void *name)
{
if (!IS_ERR(name))
kfree(name);
}
int setup_async_work(struct cifsd_work *work, void (*fn)(void **), void **arg)
{
struct smb2_hdr *rsp_hdr;
struct cifsd_tcp_conn *conn = work->conn;
int id;
rsp_hdr = (struct smb2_hdr *)RESPONSE_BUF(work);
rsp_hdr->Flags |= SMB2_FLAGS_ASYNC_COMMAND;
id = cifds_acquire_async_msg_id(conn->async_ida);
if (id < 0) {
cifsd_err("Failed to alloc async message id\n");
return id;
}
work->type = ASYNC;
rsp_hdr->Id.AsyncId = work->async_id = cpu_to_le64(id);
cifsd_debug("Send interim Response to inform async request id : %d\n",
work->async_id);
work->cancel_fn = fn;
work->cancel_argv = arg;
spin_lock(&conn->request_lock);
list_del_init(&work->request_entry);
list_add_tail(&work->request_entry,
&conn->async_requests);
spin_unlock(&conn->request_lock);
return 0;
}
void smb2_send_interim_resp(struct cifsd_work *work, __le32 status)
{
struct smb2_hdr *rsp_hdr;
rsp_hdr = (struct smb2_hdr *)RESPONSE_BUF(work);
smb2_set_err_rsp(work);
rsp_hdr->Status = status;
work->multiRsp = 1;
cifsd_tcp_write(work);
work->multiRsp = 0;
}
/**
* smb2_get_dos_mode() - get file mode in dos format from unix mode
* @stat: kstat containing file mode
*
* Return: converted dos mode
*/
static __le32 smb2_get_dos_mode(struct kstat *stat, __le32 attribute)
{
__le32 attr = 0;
attr = (attribute & 0x00005137) | ATTR_ARCHIVE;
if (S_ISDIR(stat->mode))
attr = ATTR_DIRECTORY;
else
attr &= ~(ATTR_DIRECTORY);
return attr;
}
static void
build_preauth_ctxt(struct smb2_preauth_neg_context *pneg_ctxt, __le16 hash_id)
{
pneg_ctxt->ContextType = SMB2_PREAUTH_INTEGRITY_CAPABILITIES;
pneg_ctxt->DataLength = cpu_to_le16(38);
pneg_ctxt->HashAlgorithmCount = cpu_to_le16(1);
pneg_ctxt->Reserved = cpu_to_le32(0);
pneg_ctxt->SaltLength = cpu_to_le16(SMB311_SALT_SIZE);
get_random_bytes(pneg_ctxt->Salt, SMB311_SALT_SIZE);
pneg_ctxt->HashAlgorithms = hash_id;
}
static void
build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt,
__le16 cipher_id)
{
pneg_ctxt->ContextType = SMB2_ENCRYPTION_CAPABILITIES;
pneg_ctxt->DataLength = cpu_to_le16(4);
pneg_ctxt->Reserved = cpu_to_le32(0);
pneg_ctxt->CipherCount = cpu_to_le16(1);
pneg_ctxt->Ciphers[0] = cipher_id;
}
static void
assemble_neg_contexts(struct cifsd_tcp_conn *conn,
struct smb2_negotiate_rsp *rsp)
{
/* +4 is to account for the RFC1001 len field */
char *pneg_ctxt = (char *)rsp +
le32_to_cpu(rsp->NegotiateContextOffset) + 4;
cifsd_debug("assemble SMB2_PREAUTH_INTEGRITY_CAPABILITIES context\n");
build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt,
conn->preauth_info->Preauth_HashId);
rsp->NegotiateContextCount = cpu_to_le16(1);
inc_rfc1001_len(rsp,
AUTH_GSS_PADDING + sizeof(struct smb2_preauth_neg_context));
if (conn->preauth_info->CipherId) {
cifsd_debug("assemble SMB2_ENCRYPTION_CAPABILITIES context\n");
/* Add 2 to size to round to 8 byte boundary */
pneg_ctxt += sizeof(struct smb2_preauth_neg_context) + 2;
build_encrypt_ctxt(
(struct smb2_encryption_neg_context *)pneg_ctxt,
conn->preauth_info->CipherId);
rsp->NegotiateContextCount = cpu_to_le16(2);
/* Subtract 2 to remove unused Ciphers[1] */
inc_rfc1001_len(rsp,
2 + sizeof(struct smb2_encryption_neg_context) - 2);
}
}
static int
decode_preauth_ctxt(struct cifsd_tcp_conn *conn,
struct smb2_preauth_neg_context *pneg_ctxt)
{
int err = STATUS_NO_PREAUTH_INTEGRITY_HASH_OVERLAP;
if (pneg_ctxt->HashAlgorithms ==
SMB2_PREAUTH_INTEGRITY_SHA512) {
conn->preauth_info->Preauth_HashId =
SMB2_PREAUTH_INTEGRITY_SHA512;
err = STATUS_SUCCESS;
}
return err;
}
static void
decode_encrypt_ctxt(struct cifsd_tcp_conn *conn,
struct smb2_encryption_neg_context *pneg_ctxt)
{
int i;
int cph_cnt = pneg_ctxt->CipherCount;
conn->preauth_info->CipherId = 0;
if (!encryption_enable)
return;
/* Support only AES CCM cipher now */
for (i = 0; i < cph_cnt; i++) {
if (pneg_ctxt->Ciphers[i] ==
SMB2_ENCRYPTION_AES128_CCM) {
cifsd_debug("Cipher ID = SMB2_ENCRYPTION_AES128_CCM\n");
conn->preauth_info->CipherId =
SMB2_ENCRYPTION_AES128_CCM;
break;
}
}
}
static int
deassemble_neg_contexts(struct cifsd_tcp_conn *conn,
struct smb2_negotiate_req *req)
{
int i = 0, status = 0;
/* +4 is to account for the RFC1001 len field */
char *pneg_ctxt = (char *)req +
le32_to_cpu(req->NegotiateContextOffset) + 4;
__le16 *ContextType = (__le16 *)pneg_ctxt;
int neg_ctxt_cnt = le16_to_cpu(req->NegotiateContextCount);
cifsd_debug("negotiate context count = %d\n", neg_ctxt_cnt);
status = STATUS_INVALID_PARAMETER;
while (i++ < neg_ctxt_cnt) {
if (*ContextType == SMB2_PREAUTH_INTEGRITY_CAPABILITIES) {
cifsd_debug("deassemble SMB2_PREAUTH_INTEGRITY_CAPABILITIES context\n");
if (conn->preauth_info->Preauth_HashId)
break;
status = decode_preauth_ctxt(conn,
(struct smb2_preauth_neg_context *)pneg_ctxt);
pneg_ctxt +=
sizeof(struct smb2_preauth_neg_context) + 2;
ContextType = (__le16 *)pneg_ctxt;
} else if (*ContextType == SMB2_ENCRYPTION_CAPABILITIES) {
cifsd_debug("deassemble SMB2_ENCRYPTION_CAPABILITIES context\n");
if (conn->preauth_info->CipherId)
break;
decode_encrypt_ctxt(conn,
(struct smb2_encryption_neg_context *)
pneg_ctxt);
pneg_ctxt +=
sizeof(struct smb2_encryption_neg_context) + 2;
}
if (status != STATUS_SUCCESS)
break;
}
return status;
}
/**
* smb2_handle_negotiate() - handler for smb2 negotiate command
* @work: smb work containing smb request buffer
*
* Return: 0
*/
int smb2_handle_negotiate(struct cifsd_work *work)
{
struct cifsd_tcp_conn *conn = work->conn;
struct smb2_negotiate_req *req;
struct smb2_negotiate_rsp *rsp;
int rc = 0, err;
cifsd_debug("Recieved negotiate request\n");
req = (struct smb2_negotiate_req *)REQUEST_BUF(work);
rsp = (struct smb2_negotiate_rsp *)RESPONSE_BUF(work);
conn->need_neg = false;
if (cifsd_tcp_good(work)) {
cifsd_err("conn->tcp_status is already in CifsGood State\n");
work->send_no_response = 1;
return rc;
}
if (req->DialectCount == 0) {
cifsd_err("malformed packet\n");
rsp->hdr.Status = STATUS_INVALID_PARAMETER;
rc = -EINVAL;
goto err_out;
}
conn->cli_cap = le32_to_cpu(req->Capabilities);
switch (conn->dialect) {
case SMB311_PROT_ID:
conn->preauth_info =
kzalloc(sizeof(struct preauth_integrity_info),
GFP_KERNEL);
if (!conn->preauth_info) {
rc = -ENOMEM;
rsp->hdr.Status = STATUS_INVALID_PARAMETER;
}
err = deassemble_neg_contexts(conn, req);
if (err != STATUS_SUCCESS) {
cifsd_err("deassemble_neg_contexts error(0x%x)\n", err);
rsp->hdr.Status = err;
rc = -EINVAL;
goto err_out;
}
rc = init_smb3_11_server(conn);
if (rc < 0) {
rsp->hdr.Status = STATUS_INVALID_PARAMETER;
goto err_out;
}
cifsd_gen_preauth_integrity_hash(conn, REQUEST_BUF(work),
conn->preauth_info->Preauth_HashValue);
rsp->NegotiateContextOffset =
cpu_to_le32(OFFSET_OF_NEG_CONTEXT);
assemble_neg_contexts(conn, rsp);
break;
case SMB302_PROT_ID:
init_smb3_02_server(conn);
break;
case SMB30_PROT_ID:
init_smb3_0_server(conn);
break;
case SMB21_PROT_ID:
init_smb2_1_server(conn);
break;
case SMB20_PROT_ID:
cifsd_init_smb2_server_common(conn);
break;
case SMB2X_PROT_ID:
case BAD_PROT_ID:
default:
cifsd_err("Server dialect :0x%x not supported\n", conn->dialect);
rsp->hdr.Status = STATUS_NOT_SUPPORTED;
rc = -EINVAL;
goto err_out;
}
rsp->Capabilities = cpu_to_le32(conn->srv_cap);
/* For stats */
conn->connection_type = conn->dialect;
/* Default message size limit 64K till SMB2.0, no LargeMTU*/
rsp->MaxTransactSize = cpu_to_le32(cifsd_max_msg_size());
if (conn->dialect > SMB20_PROT_ID) {
memcpy(conn->ClientGUID, req->ClientGUID,
SMB2_CLIENT_GUID_SIZE);
conn->cli_sec_mode = le16_to_cpu(req->SecurityMode);
/* With LargeMTU above SMB2.0, default message limit is 1MB */
rsp->MaxReadSize = cpu_to_le32(cifsd_default_io_size());
rsp->MaxWriteSize = cpu_to_le32(cifsd_default_io_size());
} else {
rsp->MaxReadSize = cpu_to_le32(cifsd_max_msg_size());
rsp->MaxWriteSize = cpu_to_le32(cifsd_max_msg_size());
}
rsp->StructureSize = cpu_to_le16(65);
rsp->DialectRevision = cpu_to_le16(conn->dialect);
/* Not setting conn guid rsp->ServerGUID, as it
* not used by client for identifying server
*/
memset(rsp->ServerGUID, 0, SMB2_CLIENT_GUID_SIZE);
rsp->SystemTime = cpu_to_le64(cifsd_systime());
rsp->ServerStartTime = 0;
cifsd_debug("negotiate context offset %d, count %d\n",
le32_to_cpu(rsp->NegotiateContextOffset),
le16_to_cpu(rsp->NegotiateContextCount));
rsp->SecurityBufferOffset = cpu_to_le16(128);
rsp->SecurityBufferLength = cpu_to_le16(AUTH_GSS_LENGTH);
cifsd_copy_gss_neg_header(((char *)(&rsp->hdr) +
sizeof(rsp->hdr.smb2_buf_length)) +
le16_to_cpu(rsp->SecurityBufferOffset));
inc_rfc1001_len(rsp, sizeof(struct smb2_negotiate_rsp) -
sizeof(struct smb2_hdr) - sizeof(rsp->Buffer) +
AUTH_GSS_LENGTH);
rsp->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED_LE;
conn->use_spnego = true;
if ((server_conf.signing == CIFSD_CONFIG_OPT_AUTO ||
server_conf.signing == CIFSD_CONFIG_OPT_DISABLED) &&
req->SecurityMode & SMB2_NEGOTIATE_SIGNING_REQUIRED_LE)
conn->sign = true;
else if (server_conf.signing == CIFSD_CONFIG_OPT_MANDATORY) {
server_conf.enforced_signing = true;
rsp->SecurityMode |= SMB2_NEGOTIATE_SIGNING_REQUIRED_LE;
conn->sign = true;
}
conn->srv_sec_mode = rsp->SecurityMode;
cifsd_tcp_set_need_negotiate(work);
err_out:
if (rc < 0)
smb2_set_err_rsp(work);
return rc;
}
static int match_conn_by_dialect(struct cifsd_tcp_conn *conn, void *arg)
{
struct cifsd_tcp_conn *curr = (struct cifsd_tcp_conn *)arg;
cifsd_debug("Connection.ClientGUID %*phN, Dialect %x\n",
SMB2_CLIENT_GUID_SIZE, conn->ClientGUID, conn->dialect);
if (!memcmp(conn->ClientGUID, curr->ClientGUID, SMB2_CLIENT_GUID_SIZE))
if (conn->dialect != curr->dialect)
return 1;
return 0;
}