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smb1pdu.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/math64.h>
#include <linux/fs.h>
#include <linux/posix_acl_xattr.h>
#include "glob.h"
#include "smb1pdu.h"
#include "oplock.h"
#include "buffer_pool.h"
#include "transport_tcp.h"
#include "transport_ipc.h"
#include "vfs.h"
#include "misc.h"
#include "auth.h"
#include "asn1.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"
/**
* smb_NTtimeToUnix() - convert NTFS time to unix style time format
* @ntutc: NTFS style time
*
* Convert the NT UTC (based 1601-01-01, in hundred nanosecond units)
* into Unix UTC (based 1970-01-01, in seconds).
*
* Return: timespec containing unix style time
*/
static struct timespec smb_NTtimeToUnix(__le64 ntutc)
{
struct timespec ts;
/* BB what about the timezone? BB */
/* Subtract the NTFS time offset, then convert to 1s intervals. */
/* this has been taken from cifs, ntfs code */
u64 t;
t = le64_to_cpu(ntutc) - NTFS_TIME_OFFSET;
ts.tv_nsec = do_div(t, 10000000) * 100;
ts.tv_sec = t;
return ts;
}
/**
* get_smb_cmd_val() - get smb command value from smb header
* @work: smb work containing smb header
*
* Return: smb command value
*/
int get_smb_cmd_val(struct cifsd_work *work)
{
struct smb_hdr *rcv_hdr = (struct smb_hdr *)REQUEST_BUF(work);
return rcv_hdr->Command;
}
/**
* is_smbreq_unicode() - check if the smb command is request is unicode or not
* @hdr: pointer to smb_hdr in the the request part
*
* Return: check flags and return true if request is unicode, else false
*/
static inline int is_smbreq_unicode(struct smb_hdr *hdr)
{
return hdr->Flags2 & SMBFLG2_UNICODE;
}
/**
* set_smb_rsp_status() - set error type in smb response header
* @work: smb work containing smb response header
* @err: error code to set in response
*/
void set_smb_rsp_status(struct cifsd_work *work, unsigned int err)
{
struct smb_hdr *rsp_hdr = (struct smb_hdr *) RESPONSE_BUF(work);
rsp_hdr->Status.CifsError = err;
}
/**
* init_smb_rsp_hdr() - initialize smb response header
* @work: smb work containing smb request
*
* Return: 0 on success, otherwise -EINVAL
*/
int init_smb_rsp_hdr(struct cifsd_work *work)
{
struct cifsd_tcp_conn *conn = work->conn;
struct smb_hdr *rsp_hdr;
struct smb_hdr *rcv_hdr = (struct smb_hdr *)REQUEST_BUF(work);
rsp_hdr = (struct smb_hdr *) RESPONSE_BUF(work);
memset(rsp_hdr, 0, sizeof(struct smb_hdr) + 2);
/* remove 4 byte direct TCP header, add 1 byte wc and 2 byte bcc */
rsp_hdr->smb_buf_length = cpu_to_be32(HEADER_SIZE_NO_BUF_LEN(conn) + 2);
memcpy(rsp_hdr->Protocol, rcv_hdr->Protocol, 4);
rsp_hdr->Command = rcv_hdr->Command;
/*
* Message is response. Other bits are obsolete.
*/
rsp_hdr->Flags = (SMBFLG_RESPONSE);
/*
* Lets assume error code are NTLM. True for CIFS and windows 7
*/
rsp_hdr->Flags2 = rcv_hdr->Flags2;
rsp_hdr->PidHigh = rcv_hdr->PidHigh;
rsp_hdr->Pid = rcv_hdr->Pid;
rsp_hdr->Mid = rcv_hdr->Mid;
rsp_hdr->WordCount = 0;
/* We can do the above test because we have set maxVCN as 1 */
rsp_hdr->Uid = rcv_hdr->Uid;
rsp_hdr->Tid = rcv_hdr->Tid;
return 0;
}
/**
* smb_allocate_rsp_buf() - allocate response buffer for a command
* @work: smb work containing smb request
*
* Return: 0 on success, otherwise -ENOMEM
*/
int smb_allocate_rsp_buf(struct cifsd_work *work)
{
struct smb_hdr *hdr = (struct smb_hdr *)REQUEST_BUF(work);
unsigned char cmd = hdr->Command;
size_t small_sz = cifsd_small_buffer_size();
size_t large_sz = cifsd_max_msg_size() + MAX_CIFS_HDR_SIZE;
size_t sz = small_sz;
if (cmd == SMB_COM_TRANSACTION2) {
TRANSACTION2_QPI_REQ *req =
(TRANSACTION2_QPI_REQ *)REQUEST_BUF(work);
u16 sub_cmd = le16_to_cpu(req->SubCommand);
u16 infolevel = le16_to_cpu(req->InformationLevel);
if ((sub_cmd == TRANS2_FIND_FIRST) ||
(sub_cmd == TRANS2_FIND_NEXT) ||
(sub_cmd == TRANS2_QUERY_PATH_INFORMATION &&
(infolevel == SMB_QUERY_FILE_UNIX_LINK ||
infolevel == SMB_QUERY_POSIX_ACL ||
infolevel == SMB_INFO_QUERY_ALL_EAS)))
sz = large_sz;
}
if (cmd == SMB_COM_TRANSACTION)
sz = large_sz;
if (cmd == SMB_COM_ECHO) {
int resp_size;
ECHO_REQ *req = (ECHO_REQ *)REQUEST_BUF(work);
/* size of ECHO_RSP + Bytecount - Size of Data in ECHO_RSP */
resp_size = sizeof(ECHO_RSP) + req->ByteCount - 1;
if (resp_size > cifsd_small_buffer_size())
sz = large_sz;
}
work->response_buf = cifsd_alloc_response(sz);
work->response_sz = sz;
if (RESPONSE_BUF(work) == NULL) {
cifsd_err("Failed to allocate %zu bytes buffer\n", sz);
return -ENOMEM;
}
return 0;
}
/**
* andx_request_buffer() - return pointer to matching andx command
* @work: buffer containing smb request
* @command: match next command with this command
*
* Return: pointer to matching command buffer on success, otherwise NULL
*/
static char *andx_request_buffer(char *buf, int command)
{
struct andx_block *andx_ptr = (struct andx_block *)(buf +
sizeof(struct smb_hdr) - 1);
struct andx_block *next;
while (andx_ptr->AndXCommand != SMB_NO_MORE_ANDX_COMMAND) {
next = (struct andx_block *)(buf + 4 + andx_ptr->AndXOffset);
if (andx_ptr->AndXCommand == command)
return (char *)next;
andx_ptr = next;
}
return NULL;
}
/**
* andx_response_buffer() - return pointer to andx response buffer
* @buf: buffer containing smb request
*
* Return: pointer to andx command response on success, otherwise NULL
*/
static char *andx_response_buffer(char *buf)
{
int pdu_length = get_rfc1002_length(buf);
return buf + 4 + pdu_length;
}
/**
* smb_check_user_session() - check for valid session for a user
* @work: smb work containing smb request buffer
*
* Return: 0 on success, otherwise error
*/
int smb_check_user_session(struct cifsd_work *work)
{
struct smb_hdr *req_hdr = (struct smb_hdr *)REQUEST_BUF(work);
struct cifsd_tcp_conn *conn = work->conn;
unsigned int cmd = conn->ops->get_cmd_val(work);
work->sess = NULL;
if (cmd == SMB_COM_NEGOTIATE || cmd == SMB_COM_SESSION_SETUP_ANDX)
return 0;
if (!cifsd_tcp_good(work))
return -EINVAL;
if (list_empty(&conn->sessions)) {
cifsd_debug("NO sessions registered\n");
return 0;
}
work->sess = cifsd_session_lookup(conn, req_hdr->Uid);
if (work->sess)
return 1;
cifsd_debug("Invalid user session, Uid %u\n", req_hdr->Uid);
return -EINVAL;
}
/**
* smb_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 smb_get_cifsd_tcon(struct cifsd_work *work)
{
struct smb_hdr *req_hdr = (struct smb_hdr *)REQUEST_BUF(work);
if (list_empty(&work->sess->tree_conn_list)) {
cifsd_debug("NO tree connected\n");
return 0;
}
work->tcon = NULL;
if (work->conn->ops->get_cmd_val(work) == SMB_COM_TREE_CONNECT_ANDX) {
cifsd_debug("skip to check tree connect request\n");
return 0;
}
work->tcon = cifsd_tree_conn_lookup(work->sess,
le16_to_cpu(req_hdr->Tid));
if (!work->tcon) {
cifsd_err("Invalid tid %d\n", req_hdr->Tid);
return -1;
}
return 1;
}
/**
* smb_session_disconnect() - LOGOFF request handler
* @work: smb work containing log off request buffer
*
* Return: 0 on success, otherwise error
*/
int smb_session_disconnect(struct cifsd_work *work)
{
struct cifsd_tcp_conn *conn = work->conn;
struct cifsd_session *sess = work->sess;
/* Got a valid session, set connection state */
WARN_ON(sess->conn != conn);
/* setting CifsExiting here may race with start_tcp_sess */
cifsd_tcp_set_need_reconnect(work);
cifsd_free_user(sess->user);
sess->user = NULL;
cifsd_tcp_conn_wait_idle(conn);
cifsd_tree_conn_session_logoff(sess);
cifsd_session_destroy(sess);
work->sess = NULL;
/* let start_tcp_sess free conn info now */
cifsd_tcp_set_exiting(work);
return 0;
}
/**
* smb_session_disconnect() - tree disconnect request handler
* @work: smb work containing tree disconnect request buffer
*
* Return: 0 on success, otherwise error
*/
int smb_tree_disconnect(struct cifsd_work *work)
{
struct smb_hdr *req_hdr = (struct smb_hdr *)REQUEST_BUF(work);
struct smb_hdr *rsp_hdr = (struct smb_hdr *)RESPONSE_BUF(work);
struct cifsd_tree_connect *tcon = work->tcon;
struct cifsd_session *sess = work->sess;
if (!tcon) {
cifsd_err("Invalid tid %d\n", req_hdr->Tid);
rsp_hdr->Status.CifsError = NT_STATUS_NO_SUCH_USER;
return -EINVAL;
}
close_opens_from_fibtable(sess, tcon);
cifsd_tree_conn_disconnect(sess, tcon);
return 0;
}
static void set_service_type(struct cifsd_tcp_conn *conn,
struct cifsd_share_config *share, TCONX_RSP_EXT *rsp)
{
int length;
char *buf = rsp->Service;
if (test_share_config_flag(share, CIFSD_SHARE_FLAG_PIPE)) {
length = strlen(SERVICE_IPC_SHARE);
memcpy(buf, SERVICE_IPC_SHARE, length);
rsp->ByteCount = length + 1;
buf += length;
*buf = '\0';
} else {
int uni_len = 0;
length = strlen(SERVICE_DISK_SHARE);
memcpy(buf, SERVICE_DISK_SHARE, length);
buf[length] = '\0';
length += 1;
uni_len = smbConvertToUTF16((__le16 *)(buf + length),
NATIVE_FILE_SYSTEM,
PATH_MAX, conn->local_nls, 0);
uni_len++;
uni_len *= 2;
length += uni_len;
rsp->ByteCount = length;
}
}
/**
* smb_tree_connect_andx() - tree connect request handler
* @work: smb work containing tree connect request buffer
*
* Return: 0 on success, otherwise error
*/
int smb_tree_connect_andx(struct cifsd_work *work)
{
struct smb_hdr *req_hdr = (struct smb_hdr *)REQUEST_BUF(work);
struct smb_hdr *rsp_hdr = (struct smb_hdr *)RESPONSE_BUF(work);
struct cifsd_tcp_conn *conn = work->conn;
TCONX_REQ *req;
TCONX_RSP_EXT *rsp;
int extra_byte = 0;
char *treename = NULL, *name = NULL, *dev_type = NULL;
struct cifsd_share_config *share;
struct cifsd_session *sess = work->sess;
int dev_flags = 0;
struct cifsd_tree_conn_status status;
/* Is this an ANDX command ? */
if (req_hdr->Command != SMB_COM_TREE_CONNECT_ANDX) {
cifsd_debug("SMB_COM_TREE_CONNECT_ANDX is part of ANDX");
req = (TCONX_REQ *)andx_request_buffer(REQUEST_BUF(work),
SMB_COM_TREE_CONNECT_ANDX);
rsp = (TCONX_RSP_EXT *)andx_response_buffer(RESPONSE_BUF(work));
extra_byte = 3;
if (!req) {
status.ret = -EINVAL;
goto out_err;
}
} else {
req = (TCONX_REQ *)(&req_hdr->WordCount);
rsp = (TCONX_RSP_EXT *)(&rsp_hdr->WordCount);
}
/* check if valid tree name is present in request or not */
if (!req->PasswordLength) {
treename = smb_strndup_from_utf16(req->Password + 1,
256, true, conn->local_nls);
dev_type = smb_strndup_from_utf16(req->Password + 1 +
((strlen(treename) + 1) * 2), 256, false,
conn->local_nls);
} else {
treename = smb_strndup_from_utf16(req->Password +
req->PasswordLength, 256, true,
conn->local_nls);
dev_type = smb_strndup_from_utf16(req->Password +
req->PasswordLength + ((strlen(treename) + 1) * 2),
256, false, conn->local_nls);
}
if (IS_ERR(treename) || IS_ERR(dev_type)) {
cifsd_err("Unable to strdup() treename or devtype uid %d\n",
rsp_hdr->Uid);
status.ret = CIFSD_TREE_CONN_STATUS_ERROR;
goto out_err;
}
name = extract_sharename(treename);
if (IS_ERR(name)) {
status.ret = CIFSD_TREE_CONN_STATUS_ERROR;
goto out_err;
}
cifsd_debug("tree connect request for tree %s, dev_type : %s\n",
name, dev_type);
if (!strcmp(dev_type, "A:"))
dev_flags = 1;
else if (!strncmp(dev_type, "LPT", 3))
dev_flags = 2;
else if (!strcmp(dev_type, "IPC"))
dev_flags = 3;
else if (!strcmp(dev_type, "COMM"))
dev_flags = 4;
else if (!strcmp(dev_type, "?????"))
dev_flags = 5;
if (!strncmp("IPC$", name, 4)) {
if (dev_flags < 3) {
status.ret = -ENODEV;
goto out_err;
}
} else if (!dev_flags || (dev_flags > 1 && dev_flags < 5)) {
status.ret = -ENODEV;
goto out_err;
}
status = cifsd_tree_conn_connect(sess, name);
if (status.ret == CIFSD_TREE_CONN_STATUS_OK)
rsp_hdr->Tid = status.tree_conn->id;
else
goto out_err;
share = status.tree_conn->share_conf;
rsp->WordCount = 7;
rsp->OptionalSupport = 0;
rsp->OptionalSupport = (SMB_SUPPORT_SEARCH_BITS |
SMB_CSC_NO_CACHING | SMB_UNIQUE_FILE_NAME);
rsp->MaximalShareAccessRights = 0;
rsp->MaximalShareAccessRights = (FILE_READ_RIGHTS |
FILE_EXEC_RIGHTS | FILE_WRITE_RIGHTS);
rsp->GuestMaximalShareAccessRights = 0;
set_service_type(conn, share, rsp);
/* For each extra andx response, we have to add 1 byte,
for wc and 2 bytes for byte count */
inc_rfc1001_len(rsp_hdr, (7 * 2 + rsp->ByteCount + extra_byte));
/* this is an ANDx command ? */
rsp->AndXReserved = 0;
rsp->AndXOffset = get_rfc1002_length(rsp_hdr);
if (req->AndXCommand != 0xFF) {
/* adjust response */
rsp->AndXCommand = req->AndXCommand;
return rsp->AndXCommand; /* More processing required */
}
rsp->AndXCommand = SMB_NO_MORE_ANDX_COMMAND;
kfree(treename);
kfree(dev_type);
kfree(name);
return 0;
out_err:
if (!IS_ERR(treename))
kfree(treename);
if (!IS_ERR(dev_type))
kfree(dev_type);
if (!IS_ERR(name))
kfree(name);
rsp->WordCount = 7;
rsp->AndXCommand = SMB_NO_MORE_ANDX_COMMAND;
rsp->AndXReserved = 0;
rsp->AndXOffset = get_rfc1002_length(rsp_hdr);
rsp->OptionalSupport = 0;
rsp->MaximalShareAccessRights = 0;
rsp->GuestMaximalShareAccessRights = 0;
rsp->ByteCount = 0;
cifsd_debug("error while tree connect\n");
switch (status.ret) {
case CIFSD_TREE_CONN_STATUS_NO_SHARE:
rsp_hdr->Status.CifsError = NT_STATUS_BAD_NETWORK_PATH;
break;
case -ENOMEM:
case CIFSD_TREE_CONN_STATUS_NOMEM:
rsp_hdr->Status.CifsError = NT_STATUS_NO_MEMORY;
break;
case CIFSD_TREE_CONN_STATUS_TOO_MANY_CONNS:
case CIFSD_TREE_CONN_STATUS_TOO_MANY_SESSIONS:
rsp_hdr->Status.CifsError = NT_STATUS_ACCESS_DENIED;
break;
case -ENODEV:
rsp_hdr->Status.CifsError = NT_STATUS_BAD_DEVICE_TYPE;
break;
case CIFSD_TREE_CONN_STATUS_ERROR:
rsp_hdr->Status.CifsError = NT_STATUS_BAD_NETWORK_NAME;
break;
case -EINVAL:
rsp_hdr->Status.CifsError = NT_STATUS_INVALID_PARAMETER;
break;
default:
rsp_hdr->Status.CifsError = NT_STATUS_ACCESS_DENIED;
}
/* Clean session if there is no tree attached */
if (!sess || list_empty(&sess->tree_conn_list))
cifsd_tcp_set_exiting(work);
inc_rfc1001_len(rsp_hdr, (7 * 2 + rsp->ByteCount + extra_byte));
return status.ret;
}
/**
* smb_put_name() - free memory allocated for filename
* @name: filename pointer to be freed
*/
static void smb_put_name(void *name)
{
if (!IS_ERR(name))
kfree(name);
}
/**
* smb_get_name() - convert filename on smb packet to char string
* @src: source filename, mostly in unicode format
* @maxlen: maxlen of src string to be used for parsing
* @work: smb work containing smb header flag
* @converted: src string already converted to local characterset
*
* Return: pointer to filename string on success, otherwise error ptr
*/
static char *
smb_get_name(struct cifsd_share_config *share, const char *src, const int maxlen,
struct cifsd_work *work, bool converted)
{
struct smb_hdr *req_hdr = (struct smb_hdr *)REQUEST_BUF(work);
struct smb_hdr *rsp_hdr = (struct smb_hdr *)RESPONSE_BUF(work);
bool is_unicode = is_smbreq_unicode(req_hdr);
char *name, *unixname;
char *wild_card_pos;
if (converted)
name = (char *)src;
else {
name = smb_strndup_from_utf16(src, maxlen, is_unicode,
work->conn->local_nls);
if (IS_ERR(name)) {
cifsd_debug("failed to get name %ld\n",
PTR_ERR(name));
if (PTR_ERR(name) == -ENOMEM)
rsp_hdr->Status.CifsError = NT_STATUS_NO_MEMORY;
else
rsp_hdr->Status.CifsError =
NT_STATUS_OBJECT_NAME_INVALID;
return name;
}
}
/* change it to absolute unix name */
convert_delimiter(name, 0);
/*Handling of dir path in FIND_FIRST2 having '*' at end of path*/
wild_card_pos = strrchr(name, '*');
if (wild_card_pos != NULL)
*wild_card_pos = '\0';
unixname = convert_to_unix_name(share, name);
if (!converted)
kfree(name);
if (!unixname) {
cifsd_err("can not convert absolute name\n");
rsp_hdr->Status.CifsError = NT_STATUS_NO_MEMORY;
return ERR_PTR(-ENOMEM);
}
if (check_invalid_char(unixname) < 0) {
smb_put_name(unixname);
return ERR_PTR(-ENOENT);
}
if (cifsd_share_veto_filename(share, unixname)) {
cifsd_debug("file(%s) open is not allowed by setting as veto file\n",
unixname);
smb_put_name(unixname);
return ERR_PTR(-ENOENT);
}
cifsd_debug("absoulte name = %s\n", unixname);
return unixname;
}
/**
* smb_get_dir_name() - convert directory name on smb packet to char string
* @src: source dir name, mostly in unicode format
* @maxlen: maxlen of src string to be used for parsing
* @work: smb work containing smb header flag
* @srch_ptr: update search pointer in dir for searching dir entries
*
* Return: pointer to dir name string on success, otherwise error ptr
*/
static char *smb_get_dir_name(struct cifsd_share_config *share, const char *src,
const int maxlen, struct cifsd_work *work, char **srch_ptr)
{
struct smb_hdr *req_hdr = (struct smb_hdr *)REQUEST_BUF(work);
struct smb_hdr *rsp_hdr = (struct smb_hdr *)RESPONSE_BUF(work);
bool is_unicode = is_smbreq_unicode(req_hdr);
char *name, *unixname;
char *pattern_pos, *pattern = NULL;
int pattern_len;
name = smb_strndup_from_utf16(src, maxlen, is_unicode,
work->conn->local_nls);
if (IS_ERR(name)) {
cifsd_err("failed to allocate memory\n");
rsp_hdr->Status.CifsError = NT_STATUS_NO_MEMORY;
return name;
}
/* change it to absolute unix name */
convert_delimiter(name, 0);
pattern_pos = strrchr(name, '/');
if (pattern_pos == NULL)
pattern_pos = name;
else
pattern_pos += 1;
pattern_len = strlen(pattern_pos);
if (pattern_len == 0) {
rsp_hdr->Status.CifsError = NT_STATUS_INVALID_PARAMETER;
kfree(name);
return ERR_PTR(-EINVAL);
}
cifsd_debug("pattern searched = %s pattern_len = %d\n",
pattern_pos, pattern_len);
pattern = kmalloc(pattern_len + 1, GFP_KERNEL);
if (!pattern) {
rsp_hdr->Status.CifsError = NT_STATUS_NO_MEMORY;
kfree(name);
return ERR_PTR(-ENOMEM);
}
memcpy(pattern, pattern_pos, pattern_len);
*(pattern + pattern_len) = '\0';
*pattern_pos = '\0';
*srch_ptr = pattern;
unixname = convert_to_unix_name(share, name);
kfree(name);
if (!unixname) {
kfree(pattern);
cifsd_err("can not convert absolute name\n");
rsp_hdr->Status.CifsError = NT_STATUS_INVALID_PARAMETER;
return ERR_PTR(-EINVAL);
}
if (check_invalid_char(unixname) < 0) {
smb_put_name(unixname);
return ERR_PTR(-ENOENT);
}
if (cifsd_share_veto_filename(share, unixname)) {
cifsd_debug("file(%s) open is not allowed by setting as veto file\n",
unixname);
smb_put_name(unixname);
return ERR_PTR(-ENOENT);
}
cifsd_debug("absoulte name = %s\n", unixname);
return unixname;
}
/**
* smb_rename() - rename request handler
* @work: smb work containing rename request buffer
*
* Return: 0 on success, otherwise error
*/
int smb_rename(struct cifsd_work *work)
{
RENAME_REQ *req = (RENAME_REQ *)REQUEST_BUF(work);
RENAME_RSP *rsp = (RENAME_RSP *)RESPONSE_BUF(work);
struct cifsd_share_config *share = work->tcon->share_conf;
bool is_unicode = is_smbreq_unicode(&req->hdr);
char *abs_oldname, *abs_newname, *tmp_name = NULL;
int oldname_len;
struct path path;
bool file_present = true;
int rc = 0;
abs_oldname = smb_get_name(share, req->OldFileName, PATH_MAX, work,
false);
if (IS_ERR(abs_oldname)) {
rsp->hdr.Status.CifsError =
NT_STATUS_OBJECT_NAME_INVALID;
return PTR_ERR(abs_oldname);
}
if (is_unicode)
oldname_len = smb1_utf16_name_length((__le16 *)req->OldFileName,
PATH_MAX);
else {
oldname_len = strlen(abs_oldname);
oldname_len++;
}
abs_newname = smb_get_name(share, &req->OldFileName[oldname_len + 2],
PATH_MAX, work, false);
if (IS_ERR(abs_newname)) {
rsp->hdr.Status.CifsError =
NT_STATUS_OBJECT_NAME_INVALID;
rc = PTR_ERR(abs_newname);
goto out;
}
tmp_name = kmalloc(PATH_MAX, GFP_KERNEL);
if (!tmp_name) {
rsp->hdr.Status.CifsError = NT_STATUS_NO_MEMORY;
rc = -ENOMEM;
goto out;
}
strncpy(tmp_name, abs_newname, PATH_MAX);
tmp_name[PATH_MAX - 1] = 0x00;
rc = cifsd_vfs_kern_path(tmp_name, 0, &path, 1);
if (rc)
file_present = false;
else
path_put(&path);
if (file_present &&
strncmp(abs_oldname, tmp_name,
strlen(abs_oldname))) {
rc = -EEXIST;
rsp->hdr.Status.CifsError =
NT_STATUS_OBJECT_NAME_COLLISION;
cifsd_debug("cannot rename already existing file\n");
goto out;
}
cifsd_debug("rename %s -> %s\n", abs_oldname, abs_newname);
rc = cifsd_vfs_rename(abs_oldname, abs_newname, NULL);
if (rc) {
rsp->hdr.Status.CifsError = NT_STATUS_NO_MEMORY;
goto out;
}
rsp->hdr.WordCount = 0;
rsp->ByteCount = 0;
out:
kfree(tmp_name);
smb_put_name(abs_oldname);
smb_put_name(abs_newname);
return rc;
}
/**
* smb_handle_negotiate() - negotiate request handler
* @work: smb work containing negotiate request buffer
*
* Return: 0 on success, otherwise error
*/
int smb_handle_negotiate(struct cifsd_work *work)
{
struct cifsd_tcp_conn *conn = work->conn;
NEGOTIATE_RSP *neg_rsp = (NEGOTIATE_RSP *)RESPONSE_BUF(work);
__le64 time;
struct timespec64 ts64;
int rc = 0;
WARN_ON(cifsd_tcp_good(work));
if (conn->dialect == BAD_PROT_ID) {
neg_rsp->hdr.Status.CifsError = NT_STATUS_INVALID_LOGON_TYPE;
rc = -EINVAL;
goto err_out;
}
conn->connection_type = 0;
/* wct 17 for NTLM */
neg_rsp->hdr.WordCount = 17;
neg_rsp->DialectIndex = conn->dialect;
neg_rsp->SecurityMode = SMB1_SERVER_SECU;
if (server_conf.signing == CIFSD_CONFIG_OPT_AUTO ||
server_conf.signing == CIFSD_CONFIG_OPT_MANDATORY) {
conn->sign = true;
neg_rsp->SecurityMode |= SECMODE_SIGN_ENABLED;
}
neg_rsp->MaxMpxCount = SMB1_MAX_MPX_COUNT;
neg_rsp->MaxNumberVcs = SMB1_MAX_VCS;
neg_rsp->MaxBufferSize = cifsd_max_msg_size();
neg_rsp->MaxRawSize = SMB1_MAX_RAW_SIZE;
neg_rsp->SessionKey = 0;
neg_rsp->Capabilities = conn->srv_cap = SMB1_SERVER_CAPS;
getnstimeofday64(&ts64);
time = cpu_to_le64(cifs_UnixTimeToNT(timespec64_to_timespec(ts64)));
neg_rsp->SystemTimeLow = (time & 0x00000000FFFFFFFF);
neg_rsp->SystemTimeHigh = ((time & 0xFFFFFFFF00000000) >> 32);
neg_rsp->ServerTimeZone = 0;
/* TODO: need to set spnego enable through smb.conf parameter */
conn->use_spnego = true;
if (conn->use_spnego == false) {
neg_rsp->EncryptionKeyLength = CIFS_CRYPTO_KEY_SIZE;
neg_rsp->ByteCount = CIFS_CRYPTO_KEY_SIZE;
conn->ntlmssp_cryptkey = kmalloc(CIFS_CRYPTO_KEY_SIZE,
GFP_KERNEL);
if (!conn->ntlmssp_cryptkey) {
rc = -ENOMEM;
neg_rsp->hdr.Status.CifsError = NT_STATUS_LOGON_FAILURE;
goto err_out;
}
/* initialize random server challenge */
get_random_bytes(conn->ntlmssp_cryptkey, sizeof(__u64));
memcpy((neg_rsp->u.EncryptionKey), conn->ntlmssp_cryptkey,
CIFS_CRYPTO_KEY_SIZE);
/* Adjust pdu length, 17 words and 8 bytes added */
inc_rfc1001_len(neg_rsp, (17 * 2 + 8));
} else {
neg_rsp->EncryptionKeyLength = 0;
neg_rsp->ByteCount = SMB1_CLIENT_GUID_SIZE + AUTH_GSS_LENGTH;
get_random_bytes(neg_rsp->u.extended_response.GUID,
SMB1_CLIENT_GUID_SIZE);
cifsd_copy_gss_neg_header(
neg_rsp->u.extended_response.SecurityBlob);
inc_rfc1001_len(neg_rsp, (17 * 2 + 16 + AUTH_GSS_LENGTH));
}
/* Null terminated domain name in unicode */
cifsd_tcp_set_need_negotiate(work);
/* Domain name and PC name are ignored by clients, so no need to send.
* We can try sending them later */
err_out:
return rc;
}
static int build_sess_rsp_noextsec(struct cifsd_session *sess,
struct smb_com_session_setup_req_no_secext *req,
struct smb_com_session_setup_old_resp *rsp)
{
struct cifsd_tcp_conn *conn = sess->conn;
int offset, err = 0;
char *name;
/* Build response. We don't use extended security (yet), so wct is 3 */
rsp->hdr.WordCount = 3;
rsp->Action = 0;
/* The names should be unicode */
rsp->ByteCount = 0;
/* adjust pdu length. data added 6 bytes */
inc_rfc1001_len(&rsp->hdr, 6);
/* check if valid user name is present in request or not */
offset = req->CaseInsensitivePasswordLength +
req->CaseSensitivePasswordLength;
/* 1 byte for padding */
name = smb_strndup_from_utf16((req->CaseInsensitivePassword + offset +
1), 256, true, conn->local_nls);
if (IS_ERR(name)) {
cifsd_err("cannot allocate memory\n");
err = PTR_ERR(name);
goto out_err;
}
WARN_ON(sess->user);
cifsd_debug("session setup request for user %s\n", name);
sess->user = cifsd_alloc_user(name);
kfree(name);
if (!sess->user) {
cifsd_err("user not present in database\n");
err = -EINVAL;
goto out_err;
}
if (conn->ntlmssp_cryptkey) {
memcpy(sess->ntlmssp.cryptkey, conn->ntlmssp_cryptkey,
CIFS_CRYPTO_KEY_SIZE);
kfree(conn->ntlmssp_cryptkey);
conn->ntlmssp_cryptkey = NULL;
} else {
cifsd_err("server challenge is not assigned in negotiate\n");
err = -EINVAL;
goto out_err;
}
if (user_guest(sess->user)) {
rsp->Action = GUEST_LOGIN;
goto no_password_check;
}
if (req->CaseSensitivePasswordLength == CIFS_AUTH_RESP_SIZE) {
err = cifsd_auth_ntlm(sess, req->CaseInsensitivePassword +
req->CaseInsensitivePasswordLength);
if (err) {
cifsd_err("ntlm authentication failed for user %s\n",
user_name(sess->user));
goto out_err;
}
} else {
char *ntdomain;
offset = req->CaseInsensitivePasswordLength +
req->CaseSensitivePasswordLength +
((strlen(user_name(sess->user)) + 1) * 2);
ntdomain = smb_strndup_from_utf16(
req->CaseInsensitivePassword +
offset + 1, 256, true, conn->local_nls);
if (IS_ERR(ntdomain)) {
cifsd_err("cannot allocate memory\n");
err = PTR_ERR(ntdomain);
goto out_err;
}
err = cifsd_auth_ntlmv2(sess,
(struct ntlmv2_resp *) ((char *)
req->CaseInsensitivePassword +
req->CaseInsensitivePasswordLength),
req->CaseSensitivePasswordLength -
CIFS_ENCPWD_SIZE, ntdomain);
if (err) {
cifsd_err("authentication failed for user %s\n",
user_name(sess->user));
goto out_err;
}
}
no_password_check:
/* this is an ANDx command ? */
rsp->AndXReserved = 0;
rsp->AndXOffset = get_rfc1002_length(&rsp->hdr);
if (req->AndXCommand != 0xFF) {
/* adjust response */
rsp->AndXCommand = req->AndXCommand;
return rsp->AndXCommand; /* More processing required */
}
rsp->AndXCommand = SMB_NO_MORE_ANDX_COMMAND;
out_err:
return err;
}
static int build_sess_rsp_extsec(struct cifsd_session *sess,
struct smb_com_session_setup_req *req,
struct smb_com_session_setup_resp *rsp)
{
struct cifsd_tcp_conn *conn = sess->conn;
NEGOTIATE_MESSAGE *negblob;
char *neg_blob;
int err = 0, neg_blob_len;
unsigned char *spnego_blob;
u16 spnego_blob_len;
rsp->hdr.WordCount = 4;
rsp->Action = 0;
/* The names should be unicode */
rsp->ByteCount = 0;
/* adjust pdu length. data added 6 bytes */
inc_rfc1001_len(&rsp->hdr, 8);
negblob = (NEGOTIATE_MESSAGE *)req->SecurityBlob;
err = cifsd_decode_negTokenInit((char *)negblob,
le16_to_cpu(req->SecurityBlobLength), conn);
if (!err) {
cifsd_debug("negTokenInit parse err %d\n", err);
/* If failed, it might be negTokenTarg */
err = cifsd_decode_negTokenTarg((char *)negblob,