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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 <linux/namei.h>
#include <linux/statfs.h>
#include <linux/ethtool.h>
#include <linux/falloc.h>
#include <linux/crc32.h>
#include <linux/mount.h>
#include <linux/version.h>
#if LINUX_VERSION_CODE >= KERNEL_VERSION(6, 3, 0)
#include <linux/filelock.h>
#endif
#include "compat.h"
#include "glob.h"
#include "smb2pdu.h"
#include "smbfsctl.h"
#include "oplock.h"
#include "smbacl.h"
#include "auth.h"
#include "asn1.h"
#include "connection.h"
#include "transport_ipc.h"
#include "transport_rdma.h"
#include "vfs.h"
#include "vfs_cache.h"
#include "misc.h"
#include "server.h"
#include "smb_common.h"
#include "smbstatus.h"
#include "ksmbd_work.h"
#include "mgmt/user_config.h"
#include "mgmt/share_config.h"
#include "mgmt/tree_connect.h"
#include "mgmt/user_session.h"
#include "mgmt/ksmbd_ida.h"
#include "ndr.h"
#include "transport_tcp.h"
static void __wbuf(struct ksmbd_work *work, void **req, void **rsp)
{
if (work->next_smb2_rcv_hdr_off) {
*req = ksmbd_req_buf_next(work);
*rsp = ksmbd_resp_buf_next(work);
} else {
*req = smb2_get_msg(work->request_buf);
*rsp = smb2_get_msg(work->response_buf);
}
}
#define WORK_BUFFERS(w, rq, rs) __wbuf((w), (void **)&(rq), (void **)&(rs))
/**
* check_session_id() - check for valid session id in smb header
* @conn: connection instance
* @id: session id from smb header
*
* Return: 1 if valid session id, otherwise 0
*/
static inline bool check_session_id(struct ksmbd_conn *conn, u64 id)
{
struct ksmbd_session *sess;
if (id == 0 || id == -1)
return false;
sess = ksmbd_session_lookup_all(conn, id);
if (sess) {
ksmbd_user_session_put(sess);
return true;
}
pr_err("Invalid user session id: %llu\n", id);
return false;
}
struct channel *lookup_chann_list(struct ksmbd_session *sess, struct ksmbd_conn *conn)
{
return xa_load(&sess->ksmbd_chann_list, (long)conn);
}
/**
* smb2_get_ksmbd_tcon() - get tree connection information using a tree id.
* @work: smb work
*
* Return: 0 if there is a tree connection matched or these are
* skipable commands, otherwise error
*/
int smb2_get_ksmbd_tcon(struct ksmbd_work *work)
{
struct smb2_hdr *req_hdr = ksmbd_req_buf_next(work);
unsigned int cmd = le16_to_cpu(req_hdr->Command);
unsigned int tree_id;
if (cmd == SMB2_TREE_CONNECT_HE ||
cmd == SMB2_CANCEL_HE ||
cmd == SMB2_LOGOFF_HE) {
ksmbd_debug(SMB, "skip to check tree connect request\n");
return 0;
}
if (xa_empty(&work->sess->tree_conns)) {
ksmbd_debug(SMB, "NO tree connected\n");
return -ENOENT;
}
tree_id = le32_to_cpu(req_hdr->Id.SyncId.TreeId);
/*
* If request is not the first in Compound request,
* Just validate tree id in header with work->tcon->id.
*/
if (work->next_smb2_rcv_hdr_off) {
if (!work->tcon) {
pr_err("The first operation in the compound does not have tcon\n");
return -EINVAL;
}
if (tree_id != UINT_MAX && work->tcon->id != tree_id) {
pr_err("tree id(%u) is different with id(%u) in first operation\n",
tree_id, work->tcon->id);
return -EINVAL;
}
return 1;
}
work->tcon = ksmbd_tree_conn_lookup(work->sess, tree_id);
if (!work->tcon) {
pr_err("Invalid tid %d\n", tree_id);
return -ENOENT;
}
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 ksmbd_work *work)
{
struct smb2_err_rsp *err_rsp;
if (work->next_smb2_rcv_hdr_off)
err_rsp = ksmbd_resp_buf_next(work);
else
err_rsp = smb2_get_msg(work->response_buf);
if (err_rsp->hdr.Status != STATUS_STOPPED_ON_SYMLINK) {
int err;
err_rsp->StructureSize = SMB2_ERROR_STRUCTURE_SIZE2_LE;
err_rsp->ErrorContextCount = 0;
err_rsp->Reserved = 0;
err_rsp->ByteCount = 0;
err_rsp->ErrorData[0] = 0;
err = ksmbd_iov_pin_rsp(work, (void *)err_rsp,
__SMB2_HEADER_STRUCTURE_SIZE +
SMB2_ERROR_STRUCTURE_SIZE2);
if (err)
work->send_no_response = 1;
}
}
/**
* is_smb2_neg_cmd() - is it smb2 negotiation command
* @work: smb work containing smb header
*
* Return: true if smb2 negotiation command, otherwise false
*/
bool is_smb2_neg_cmd(struct ksmbd_work *work)
{
struct smb2_hdr *hdr = smb2_get_msg(work->request_buf);
/* is it SMB2 header ? */
if (hdr->ProtocolId != SMB2_PROTO_NUMBER)
return false;
/* make sure it is request not response message */
if (hdr->Flags & SMB2_FLAGS_SERVER_TO_REDIR)
return false;
if (hdr->Command != SMB2_NEGOTIATE)
return false;
return true;
}
/**
* is_smb2_rsp() - is it smb2 response
* @work: smb work containing smb response buffer
*
* Return: true if smb2 response, otherwise false
*/
bool is_smb2_rsp(struct ksmbd_work *work)
{
struct smb2_hdr *hdr = smb2_get_msg(work->response_buf);
/* is it SMB2 header ? */
if (hdr->ProtocolId != SMB2_PROTO_NUMBER)
return false;
/* make sure it is response not request message */
if (!(hdr->Flags & SMB2_FLAGS_SERVER_TO_REDIR))
return false;
return true;
}
/**
* get_smb2_cmd_val() - get smb command code from smb header
* @work: smb work containing smb request buffer
*
* Return: smb2 request command value
*/
u16 get_smb2_cmd_val(struct ksmbd_work *work)
{
struct smb2_hdr *rcv_hdr;
if (work->next_smb2_rcv_hdr_off)
rcv_hdr = ksmbd_req_buf_next(work);
else
rcv_hdr = smb2_get_msg(work->request_buf);
return le16_to_cpu(rcv_hdr->Command);
}
/**
* set_smb2_rsp_status() - set error response code on smb2 header
* @work: smb work containing response buffer
* @err: error response code
*/
void set_smb2_rsp_status(struct ksmbd_work *work, __le32 err)
{
struct smb2_hdr *rsp_hdr;
rsp_hdr = smb2_get_msg(work->response_buf);
rsp_hdr->Status = err;
work->iov_idx = 0;
work->iov_cnt = 0;
work->next_smb2_rcv_hdr_off = 0;
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 ksmbd_work *work)
{
struct smb2_hdr *rsp_hdr;
struct smb2_negotiate_rsp *rsp;
struct ksmbd_conn *conn = work->conn;
int err;
rsp_hdr = smb2_get_msg(work->response_buf);
memset(rsp_hdr, 0, sizeof(struct smb2_hdr) + 2);
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 = smb2_get_msg(work->response_buf);
WARN_ON(ksmbd_conn_good(conn));
rsp->StructureSize = cpu_to_le16(65);
ksmbd_debug(SMB, "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 = cpu_to_le32(conn->vals->capabilities);
/* Default Max Message Size till SMB2.0, 64K*/
rsp->MaxTransactSize = cpu_to_le32(conn->vals->max_trans_size);
rsp->MaxReadSize = cpu_to_le32(conn->vals->max_read_size);
rsp->MaxWriteSize = cpu_to_le32(conn->vals->max_write_size);
rsp->SystemTime = cpu_to_le64(ksmbd_systime());
rsp->ServerStartTime = 0;
rsp->SecurityBufferOffset = cpu_to_le16(128);
rsp->SecurityBufferLength = cpu_to_le16(AUTH_GSS_LENGTH);
ksmbd_copy_gss_neg_header((char *)(&rsp->hdr) +
le16_to_cpu(rsp->SecurityBufferOffset));
rsp->SecurityMode = SMB2_NEGOTIATE_SIGNING_ENABLED_LE;
if (server_conf.signing == KSMBD_CONFIG_OPT_MANDATORY)
rsp->SecurityMode |= SMB2_NEGOTIATE_SIGNING_REQUIRED_LE;
err = ksmbd_iov_pin_rsp(work, rsp, sizeof(struct smb2_negotiate_rsp) +
AUTH_GSS_LENGTH);
if (err)
return err;
conn->use_spnego = true;
ksmbd_conn_set_need_negotiate(conn);
return 0;
}
/**
* smb2_set_rsp_credits() - set number of credits in response buffer
* @work: smb work containing smb response buffer
*/
int smb2_set_rsp_credits(struct ksmbd_work *work)
{
struct smb2_hdr *req_hdr = ksmbd_req_buf_next(work);
struct smb2_hdr *hdr = ksmbd_resp_buf_next(work);
struct ksmbd_conn *conn = work->conn;
unsigned short credits_requested, aux_max;
unsigned short credit_charge, credits_granted = 0;
if (work->send_no_response)
return 0;
hdr->CreditCharge = req_hdr->CreditCharge;
if (conn->total_credits > conn->vals->max_credits) {
hdr->CreditRequest = 0;
pr_err("Total credits overflow: %d\n", conn->total_credits);
return -EINVAL;
}
credit_charge = max_t(unsigned short,
le16_to_cpu(req_hdr->CreditCharge), 1);
if (credit_charge > conn->total_credits) {
ksmbd_debug(SMB, "Insufficient credits granted, given: %u, granted: %u\n",
credit_charge, conn->total_credits);
return -EINVAL;
}
conn->total_credits -= credit_charge;
conn->outstanding_credits -= credit_charge;
credits_requested = max_t(unsigned short,
le16_to_cpu(req_hdr->CreditRequest), 1);
/* according to smb2.credits smbtorture, Windows server
* 2016 or later grant up to 8192 credits at once.
*
* TODO: Need to adjuct CreditRequest value according to
* current cpu load
*/
if (hdr->Command == SMB2_NEGOTIATE)
aux_max = 1;
else
aux_max = conn->vals->max_credits - conn->total_credits;
credits_granted = min_t(unsigned short, credits_requested, aux_max);
conn->total_credits += credits_granted;
work->credits_granted += credits_granted;
if (!req_hdr->NextCommand) {
/* Update CreditRequest in last request */
hdr->CreditRequest = cpu_to_le16(work->credits_granted);
}
ksmbd_debug(SMB,
"credits: requested[%d] granted[%d] total_granted[%d]\n",
credits_requested, credits_granted,
conn->total_credits);
return 0;
}
/**
* init_chained_smb2_rsp() - initialize smb2 chained response
* @work: smb work containing smb response buffer
*/
static void init_chained_smb2_rsp(struct ksmbd_work *work)
{
struct smb2_hdr *req = ksmbd_req_buf_next(work);
struct smb2_hdr *rsp = ksmbd_resp_buf_next(work);
struct smb2_hdr *rsp_hdr;
struct smb2_hdr *rcv_hdr;
int next_hdr_offset = 0;
int len, new_len;
/* 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 = ((struct smb2_create_rsp *)rsp)->VolatileFileId;
work->compound_pfid = ((struct smb2_create_rsp *)rsp)->PersistentFileId;
work->compound_sid = le64_to_cpu(rsp->SessionId);
}
len = get_rfc1002_len(work->response_buf) - work->next_smb2_rsp_hdr_off;
next_hdr_offset = le32_to_cpu(req->NextCommand);
new_len = ALIGN(len, 8);
work->iov[work->iov_idx].iov_len += (new_len - len);
inc_rfc1001_len(work->response_buf, new_len - len);
rsp->NextCommand = cpu_to_le32(new_len);
work->next_smb2_rcv_hdr_off += next_hdr_offset;
work->curr_smb2_rsp_hdr_off = work->next_smb2_rsp_hdr_off;
work->next_smb2_rsp_hdr_off += new_len;
ksmbd_debug(SMB,
"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 = ksmbd_resp_buf_next(work);
rcv_hdr = ksmbd_req_buf_next(work);
if (!(rcv_hdr->Flags & SMB2_FLAGS_RELATED_OPERATIONS)) {
ksmbd_debug(SMB, "related flag should be set\n");
work->compound_fid = KSMBD_NO_FID;
work->compound_pfid = KSMBD_NO_FID;
}
memset((char *)rsp_hdr, 0, sizeof(struct smb2_hdr) + 2);
rsp_hdr->ProtocolId = SMB2_PROTO_NUMBER;
rsp_hdr->StructureSize = SMB2_HEADER_STRUCTURE_SIZE;
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 ksmbd_work *work)
{
struct smb2_hdr *hdr = smb2_get_msg(work->request_buf);
unsigned int len, next_cmd;
if (hdr->ProtocolId != SMB2_PROTO_NUMBER)
return false;
hdr = ksmbd_req_buf_next(work);
next_cmd = le32_to_cpu(hdr->NextCommand);
if (next_cmd > 0) {
if ((u64)work->next_smb2_rcv_hdr_off + next_cmd +
__SMB2_HEADER_STRUCTURE_SIZE >
get_rfc1002_len(work->request_buf)) {
pr_err("next command(%u) offset exceeds smb msg size\n",
next_cmd);
return false;
}
if ((u64)get_rfc1002_len(work->response_buf) + MAX_CIFS_SMALL_BUFFER_SIZE >
work->response_sz) {
pr_err("next response offset exceeds response buffer size\n");
return false;
}
ksmbd_debug(SMB, "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 = ALIGN(get_rfc1002_len(work->response_buf), 8);
len = len - get_rfc1002_len(work->response_buf);
if (len) {
ksmbd_debug(SMB, "padding len %u\n", len);
work->iov[work->iov_idx].iov_len += len;
inc_rfc1001_len(work->response_buf, len);
}
work->curr_smb2_rsp_hdr_off = work->next_smb2_rsp_hdr_off;
}
return false;
}
/**
* init_smb2_rsp_hdr() - initialize smb2 response
* @work: smb work containing smb request buffer
*
* Return: 0
*/
int init_smb2_rsp_hdr(struct ksmbd_work *work)
{
struct smb2_hdr *rsp_hdr = smb2_get_msg(work->response_buf);
struct smb2_hdr *rcv_hdr = smb2_get_msg(work->request_buf);
memset(rsp_hdr, 0, sizeof(struct smb2_hdr) + 2);
rsp_hdr->ProtocolId = rcv_hdr->ProtocolId;
rsp_hdr->StructureSize = SMB2_HEADER_STRUCTURE_SIZE;
rsp_hdr->Command = rcv_hdr->Command;
/*
* Message is response. We don't grant oplock yet.
*/
rsp_hdr->Flags = (SMB2_FLAGS_SERVER_TO_REDIR);
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);
return 0;
}
/**
* smb2_allocate_rsp_buf() - allocate smb2 response buffer
* @work: smb work containing smb request buffer
*
* Return: 0 on success, otherwise error
*/
int smb2_allocate_rsp_buf(struct ksmbd_work *work)
{
struct smb2_hdr *hdr = smb2_get_msg(work->request_buf);
size_t small_sz = MAX_CIFS_SMALL_BUFFER_SIZE;
size_t large_sz = small_sz + work->conn->vals->max_trans_size;
size_t sz = small_sz;
int cmd = le16_to_cpu(hdr->Command);
if (cmd == SMB2_IOCTL_HE || cmd == SMB2_QUERY_DIRECTORY_HE)
sz = large_sz;
if (cmd == SMB2_QUERY_INFO_HE) {
struct smb2_query_info_req *req;
if (get_rfc1002_len(work->request_buf) <
offsetof(struct smb2_query_info_req, OutputBufferLength))
return -EINVAL;
req = smb2_get_msg(work->request_buf);
if ((req->InfoType == SMB2_O_INFO_FILE &&
(req->FileInfoClass == FILE_FULL_EA_INFORMATION ||
req->FileInfoClass == FILE_ALL_INFORMATION)) ||
req->InfoType == SMB2_O_INFO_SECURITY)
sz = large_sz;
}
/* allocate large response buf for chained commands */
if (le32_to_cpu(hdr->NextCommand) > 0)
sz = large_sz;
work->response_buf = kvzalloc(sz, KSMBD_DEFAULT_GFP);
if (!work->response_buf)
return -ENOMEM;
work->response_sz = sz;
return 0;
}
/**
* 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 ksmbd_work *work)
{
struct smb2_hdr *req_hdr = ksmbd_req_buf_next(work);
struct ksmbd_conn *conn = work->conn;
unsigned int cmd = le16_to_cpu(req_hdr->Command);
unsigned long long sess_id;
/*
* SMB2_ECHO, SMB2_NEGOTIATE, SMB2_SESSION_SETUP command do 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 (!ksmbd_conn_good(conn))
return -EIO;
sess_id = le64_to_cpu(req_hdr->SessionId);
/*
* If request is not the first in Compound request,
* Just validate session id in header with work->sess->id.
*/
if (work->next_smb2_rcv_hdr_off) {
if (!work->sess) {
pr_err("The first operation in the compound does not have sess\n");
return -EINVAL;
}
if (sess_id != ULLONG_MAX && work->sess->id != sess_id) {
pr_err("session id(%llu) is different with the first operation(%lld)\n",
sess_id, work->sess->id);
return -EINVAL;
}
return 1;
}
/* Check for validity of user session */
work->sess = ksmbd_session_lookup_all(conn, sess_id);
if (work->sess)
return 1;
ksmbd_debug(SMB, "Invalid user session, Uid %llu\n", sess_id);
return -ENOENT;
}
/**
* smb2_get_name() - get filename string from on the wire smb format
* @src: source buffer
* @maxlen: maxlen of source string
* @local_nls: nls_table pointer
*
* Return: matching converted filename on success, otherwise error ptr
*/
static char *
smb2_get_name(const char *src, const int maxlen, struct nls_table *local_nls)
{
char *name;
name = smb_strndup_from_utf16(src, maxlen, 1, local_nls);
if (IS_ERR(name)) {
pr_err("failed to get name %ld\n", PTR_ERR(name));
return name;
}
if (*name == '\\') {
pr_err("not allow directory name included leading slash\n");
kfree(name);
return ERR_PTR(-EINVAL);
}
ksmbd_conv_path_to_unix(name);
ksmbd_strip_last_slash(name);
return name;
}
int setup_async_work(struct ksmbd_work *work, void (*fn)(void **), void **arg)
{
struct ksmbd_conn *conn = work->conn;
int id;
id = ksmbd_acquire_async_msg_id(&conn->async_ida);
if (id < 0) {
pr_err("Failed to alloc async message id\n");
return id;
}
work->asynchronous = true;
work->async_id = id;
ksmbd_debug(SMB,
"Send interim Response to inform async request id : %d\n",
work->async_id);
work->cancel_fn = fn;
work->cancel_argv = arg;
if (list_empty(&work->async_request_entry)) {
spin_lock(&conn->request_lock);
list_add_tail(&work->async_request_entry, &conn->async_requests);
spin_unlock(&conn->request_lock);
}
return 0;
}
void release_async_work(struct ksmbd_work *work)
{
struct ksmbd_conn *conn = work->conn;
spin_lock(&conn->request_lock);
list_del_init(&work->async_request_entry);
spin_unlock(&conn->request_lock);
work->asynchronous = 0;
work->cancel_fn = NULL;
kfree(work->cancel_argv);
work->cancel_argv = NULL;
if (work->async_id) {
ksmbd_release_id(&conn->async_ida, work->async_id);
work->async_id = 0;
}
}
void smb2_send_interim_resp(struct ksmbd_work *work, __le32 status)
{
struct smb2_hdr *rsp_hdr;
struct ksmbd_work *in_work = ksmbd_alloc_work_struct();
if (!in_work)
return;
if (allocate_interim_rsp_buf(in_work)) {
pr_err("smb_allocate_rsp_buf failed!\n");
ksmbd_free_work_struct(in_work);
return;
}
in_work->conn = work->conn;
memcpy(smb2_get_msg(in_work->response_buf), ksmbd_resp_buf_next(work),
__SMB2_HEADER_STRUCTURE_SIZE);
rsp_hdr = smb2_get_msg(in_work->response_buf);
rsp_hdr->Flags |= SMB2_FLAGS_ASYNC_COMMAND;
rsp_hdr->Id.AsyncId = cpu_to_le64(work->async_id);
smb2_set_err_rsp(in_work);
rsp_hdr->Status = status;
ksmbd_conn_write(in_work);
ksmbd_free_work_struct(in_work);
}
static __le32 smb2_get_reparse_tag_special_file(umode_t mode)
{
if (S_ISDIR(mode) || S_ISREG(mode))
return 0;
if (S_ISLNK(mode))
return IO_REPARSE_TAG_LX_SYMLINK_LE;
else if (S_ISFIFO(mode))
return IO_REPARSE_TAG_LX_FIFO_LE;
else if (S_ISSOCK(mode))
return IO_REPARSE_TAG_AF_UNIX_LE;
else if (S_ISCHR(mode))
return IO_REPARSE_TAG_LX_CHR_LE;
else if (S_ISBLK(mode))
return IO_REPARSE_TAG_LX_BLK_LE;
return 0;
}
/**
* smb2_get_dos_mode() - get file mode in dos format from unix mode
* @stat: kstat containing file mode
* @attribute: attribute flags
*
* Return: converted dos mode
*/
static int smb2_get_dos_mode(struct kstat *stat, int attribute)
{
int attr = 0;
if (S_ISDIR(stat->mode)) {
attr = ATTR_DIRECTORY |
(attribute & (ATTR_HIDDEN | ATTR_SYSTEM));
} else {
attr = (attribute & 0x00005137) | ATTR_ARCHIVE;
attr &= ~(ATTR_DIRECTORY);
if (S_ISREG(stat->mode) && (server_conf.share_fake_fscaps &
FILE_SUPPORTS_SPARSE_FILES))
attr |= ATTR_SPARSE;
if (smb2_get_reparse_tag_special_file(stat->mode))
attr |= ATTR_REPARSE;
}
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_type)
{
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_type;
}
static void build_sign_cap_ctxt(struct smb2_signing_capabilities *pneg_ctxt,
__le16 sign_algo)
{
pneg_ctxt->ContextType = SMB2_SIGNING_CAPABILITIES;
pneg_ctxt->DataLength =
cpu_to_le16((sizeof(struct smb2_signing_capabilities) + 2)
- sizeof(struct smb2_neg_context));
pneg_ctxt->Reserved = cpu_to_le32(0);
pneg_ctxt->SigningAlgorithmCount = cpu_to_le16(1);
pneg_ctxt->SigningAlgorithms[0] = sign_algo;
}
static void build_posix_ctxt(struct smb2_posix_neg_context *pneg_ctxt)
{
pneg_ctxt->ContextType = SMB2_POSIX_EXTENSIONS_AVAILABLE;
pneg_ctxt->DataLength = cpu_to_le16(POSIX_CTXT_DATA_LEN);
/* SMB2_CREATE_TAG_POSIX is "0x93AD25509CB411E7B42383DE968BCD7C" */
pneg_ctxt->Name[0] = 0x93;
pneg_ctxt->Name[1] = 0xAD;
pneg_ctxt->Name[2] = 0x25;
pneg_ctxt->Name[3] = 0x50;
pneg_ctxt->Name[4] = 0x9C;
pneg_ctxt->Name[5] = 0xB4;
pneg_ctxt->Name[6] = 0x11;
pneg_ctxt->Name[7] = 0xE7;
pneg_ctxt->Name[8] = 0xB4;
pneg_ctxt->Name[9] = 0x23;
pneg_ctxt->Name[10] = 0x83;
pneg_ctxt->Name[11] = 0xDE;
pneg_ctxt->Name[12] = 0x96;
pneg_ctxt->Name[13] = 0x8B;
pneg_ctxt->Name[14] = 0xCD;
pneg_ctxt->Name[15] = 0x7C;
}
static unsigned int assemble_neg_contexts(struct ksmbd_conn *conn,
struct smb2_negotiate_rsp *rsp)
{
char * const pneg_ctxt = (char *)rsp +
le32_to_cpu(rsp->NegotiateContextOffset);
int neg_ctxt_cnt = 1;
int ctxt_size;
ksmbd_debug(SMB,
"assemble SMB2_PREAUTH_INTEGRITY_CAPABILITIES context\n");
build_preauth_ctxt((struct smb2_preauth_neg_context *)pneg_ctxt,
conn->preauth_info->Preauth_HashId);
ctxt_size = sizeof(struct smb2_preauth_neg_context);
if (conn->cipher_type) {
/* Round to 8 byte boundary */
ctxt_size = round_up(ctxt_size, 8);
ksmbd_debug(SMB,
"assemble SMB2_ENCRYPTION_CAPABILITIES context\n");
build_encrypt_ctxt((struct smb2_encryption_neg_context *)
(pneg_ctxt + ctxt_size),
conn->cipher_type);
neg_ctxt_cnt++;
ctxt_size += sizeof(struct smb2_encryption_neg_context) + 2;
}
/* compression context not yet supported */
WARN_ON(conn->compress_algorithm != SMB3_COMPRESS_NONE);
if (conn->posix_ext_supported) {
ctxt_size = round_up(ctxt_size, 8);
ksmbd_debug(SMB,
"assemble SMB2_POSIX_EXTENSIONS_AVAILABLE context\n");
build_posix_ctxt((struct smb2_posix_neg_context *)
(pneg_ctxt + ctxt_size));
neg_ctxt_cnt++;
ctxt_size += sizeof(struct smb2_posix_neg_context);
}
if (conn->signing_negotiated) {
ctxt_size = round_up(ctxt_size, 8);
ksmbd_debug(SMB,
"assemble SMB2_SIGNING_CAPABILITIES context\n");
build_sign_cap_ctxt((struct smb2_signing_capabilities *)
(pneg_ctxt + ctxt_size),
conn->signing_algorithm);
neg_ctxt_cnt++;
ctxt_size += sizeof(struct smb2_signing_capabilities) + 2;
}
rsp->NegotiateContextCount = cpu_to_le16(neg_ctxt_cnt);
return ctxt_size + AUTH_GSS_PADDING;
}
static __le32 decode_preauth_ctxt(struct ksmbd_conn *conn,
struct smb2_preauth_neg_context *pneg_ctxt,
int ctxt_len)
{
/*
* sizeof(smb2_preauth_neg_context) assumes SMB311_SALT_SIZE Salt,
* which may not be present. Only check for used HashAlgorithms[1].
*/
if (ctxt_len <
sizeof(struct smb2_neg_context) + MIN_PREAUTH_CTXT_DATA_LEN)
return STATUS_INVALID_PARAMETER;
if (pneg_ctxt->HashAlgorithms != SMB2_PREAUTH_INTEGRITY_SHA512)
return STATUS_NO_PREAUTH_INTEGRITY_HASH_OVERLAP;
conn->preauth_info->Preauth_HashId = SMB2_PREAUTH_INTEGRITY_SHA512;
return STATUS_SUCCESS;
}
static void decode_encrypt_ctxt(struct ksmbd_conn *conn,
struct smb2_encryption_neg_context *pneg_ctxt,
int ctxt_len)
{
int cph_cnt;
int i, cphs_size;
if (sizeof(struct smb2_encryption_neg_context) > ctxt_len) {
pr_err("Invalid SMB2_ENCRYPTION_CAPABILITIES context size\n");
return;
}
conn->cipher_type = 0;
cph_cnt = le16_to_cpu(pneg_ctxt->CipherCount);
cphs_size = cph_cnt * sizeof(__le16);
if (sizeof(struct smb2_encryption_neg_context) + cphs_size >
ctxt_len) {
pr_err("Invalid cipher count(%d)\n", cph_cnt);
return;
}
if (server_conf.flags & KSMBD_GLOBAL_FLAG_SMB2_ENCRYPTION_OFF)
return;
for (i = 0; i < cph_cnt; i++) {
if (pneg_ctxt->Ciphers[i] == SMB2_ENCRYPTION_AES128_GCM ||
pneg_ctxt->Ciphers[i] == SMB2_ENCRYPTION_AES128_CCM ||
pneg_ctxt->Ciphers[i] == SMB2_ENCRYPTION_AES256_CCM ||
pneg_ctxt->Ciphers[i] == SMB2_ENCRYPTION_AES256_GCM) {
ksmbd_debug(SMB, "Cipher ID = 0x%x\n",
pneg_ctxt->Ciphers[i]);
conn->cipher_type = pneg_ctxt->Ciphers[i];
break;
}
}
}
/**
* smb3_encryption_negotiated() - checks if server and client agreed on enabling encryption
* @conn: smb connection
*
* Return: true if connection should be encrypted, else false
*/
bool smb3_encryption_negotiated(struct ksmbd_conn *conn)
{
if (!conn->ops->generate_encryptionkey)
return false;
/*
* SMB 3.0 and 3.0.2 dialects use the SMB2_GLOBAL_CAP_ENCRYPTION flag.
* SMB 3.1.1 uses the cipher_type field.
*/
return (conn->vals->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION) ||
conn->cipher_type;
}
static void decode_compress_ctxt(struct ksmbd_conn *conn,
struct smb2_compression_ctx *pneg_ctxt)
{
conn->compress_algorithm = SMB3_COMPRESS_NONE;
}
static void decode_sign_cap_ctxt(struct ksmbd_conn *conn,
struct smb2_signing_capabilities *pneg_ctxt,
int ctxt_len)
{
int sign_algo_cnt;
int i, sign_alos_size;
if (sizeof(struct smb2_signing_capabilities) > ctxt_len) {
pr_err("Invalid SMB2_SIGNING_CAPABILITIES context length\n");
return;
}
conn->signing_negotiated = false;
sign_algo_cnt = le16_to_cpu(pneg_ctxt->SigningAlgorithmCount);
sign_alos_size = sign_algo_cnt * sizeof(__le16);
if (sizeof(struct smb2_signing_capabilities) + sign_alos_size >
ctxt_len) {
pr_err("Invalid signing algorithm count(%d)\n", sign_algo_cnt);
return;
}
for (i = 0; i < sign_algo_cnt; i++) {
if (pneg_ctxt->SigningAlgorithms[i] == SIGNING_ALG_HMAC_SHA256 ||
pneg_ctxt->SigningAlgorithms[i] == SIGNING_ALG_AES_CMAC) {
ksmbd_debug(SMB, "Signing Algorithm ID = 0x%x\n",
pneg_ctxt->SigningAlgorithms[i]);
conn->signing_negotiated = true;
conn->signing_algorithm =
pneg_ctxt->SigningAlgorithms[i];
break;
}