2021-03-16 01:49:09 +00:00
|
|
|
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
|
|
/*
|
|
|
|
* Copyright (C) 2018 Samsung Electronics Co., Ltd.
|
|
|
|
* Copyright (C) 2018 Namjae Jeon <linkinjeon@kernel.org>
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include "smb_common.h"
|
|
|
|
#include "server.h"
|
|
|
|
#include "misc.h"
|
|
|
|
#include "smbstatus.h"
|
|
|
|
#include "connection.h"
|
|
|
|
#include "ksmbd_work.h"
|
|
|
|
#include "mgmt/user_session.h"
|
|
|
|
#include "mgmt/user_config.h"
|
|
|
|
#include "mgmt/tree_connect.h"
|
|
|
|
#include "mgmt/share_config.h"
|
|
|
|
|
|
|
|
/*for shortname implementation */
|
|
|
|
static const char basechars[43] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_-!@#$%";
|
2021-03-30 05:25:35 +00:00
|
|
|
#define MANGLE_BASE (sizeof(basechars) / sizeof(char) - 1)
|
2021-03-16 01:49:09 +00:00
|
|
|
#define MAGIC_CHAR '~'
|
|
|
|
#define PERIOD '.'
|
|
|
|
#define mangle(V) ((char)(basechars[(V) % MANGLE_BASE]))
|
|
|
|
#define KSMBD_MIN_SUPPORTED_HEADER_SIZE (sizeof(struct smb2_hdr))
|
|
|
|
|
|
|
|
LIST_HEAD(global_lock_list);
|
|
|
|
|
|
|
|
struct smb_protocol {
|
|
|
|
int index;
|
|
|
|
char *name;
|
|
|
|
char *prot;
|
|
|
|
__u16 prot_id;
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct smb_protocol smb_protos[] = {
|
|
|
|
{
|
|
|
|
SMB21_PROT,
|
|
|
|
"\2SMB 2.1",
|
|
|
|
"SMB2_10",
|
|
|
|
SMB21_PROT_ID
|
|
|
|
},
|
|
|
|
{
|
|
|
|
SMB2X_PROT,
|
|
|
|
"\2SMB 2.???",
|
|
|
|
"SMB2_22",
|
|
|
|
SMB2X_PROT_ID
|
|
|
|
},
|
|
|
|
{
|
|
|
|
SMB30_PROT,
|
|
|
|
"\2SMB 3.0",
|
|
|
|
"SMB3_00",
|
|
|
|
SMB30_PROT_ID
|
|
|
|
},
|
|
|
|
{
|
|
|
|
SMB302_PROT,
|
|
|
|
"\2SMB 3.02",
|
|
|
|
"SMB3_02",
|
|
|
|
SMB302_PROT_ID
|
|
|
|
},
|
|
|
|
{
|
|
|
|
SMB311_PROT,
|
|
|
|
"\2SMB 3.1.1",
|
|
|
|
"SMB3_11",
|
|
|
|
SMB311_PROT_ID
|
|
|
|
},
|
|
|
|
};
|
|
|
|
|
|
|
|
unsigned int ksmbd_server_side_copy_max_chunk_count(void)
|
|
|
|
{
|
|
|
|
return 256;
|
|
|
|
}
|
|
|
|
|
|
|
|
unsigned int ksmbd_server_side_copy_max_chunk_size(void)
|
|
|
|
{
|
|
|
|
return (2U << 30) - 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
unsigned int ksmbd_server_side_copy_max_total_size(void)
|
|
|
|
{
|
|
|
|
return (2U << 30) - 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
inline int ksmbd_min_protocol(void)
|
|
|
|
{
|
|
|
|
return SMB2_PROT;
|
|
|
|
}
|
|
|
|
|
|
|
|
inline int ksmbd_max_protocol(void)
|
|
|
|
{
|
|
|
|
return SMB311_PROT;
|
|
|
|
}
|
|
|
|
|
|
|
|
int ksmbd_lookup_protocol_idx(char *str)
|
|
|
|
{
|
|
|
|
int offt = ARRAY_SIZE(smb_protos) - 1;
|
|
|
|
int len = strlen(str);
|
|
|
|
|
|
|
|
while (offt >= 0) {
|
|
|
|
if (!strncmp(str, smb_protos[offt].prot, len)) {
|
|
|
|
ksmbd_debug(SMB, "selected %s dialect idx = %d\n",
|
2021-05-26 08:57:12 +00:00
|
|
|
smb_protos[offt].prot, offt);
|
2021-03-16 01:49:09 +00:00
|
|
|
return smb_protos[offt].index;
|
|
|
|
}
|
|
|
|
offt--;
|
|
|
|
}
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
2021-03-21 08:05:56 +00:00
|
|
|
* ksmbd_verify_smb_message() - check for valid smb2 request header
|
|
|
|
* @work: smb work
|
2021-03-16 01:49:09 +00:00
|
|
|
*
|
|
|
|
* check for valid smb signature and packet direction(request/response)
|
|
|
|
*
|
|
|
|
* Return: 0 on success, otherwise 1
|
|
|
|
*/
|
|
|
|
int ksmbd_verify_smb_message(struct ksmbd_work *work)
|
|
|
|
{
|
2021-03-30 03:35:23 +00:00
|
|
|
struct smb2_hdr *smb2_hdr = work->request_buf;
|
2021-03-16 01:49:09 +00:00
|
|
|
|
|
|
|
if (smb2_hdr->ProtocolId == SMB2_PROTO_NUMBER)
|
|
|
|
return ksmbd_smb2_check_message(work);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
2021-03-21 08:05:56 +00:00
|
|
|
* ksmbd_smb_request() - check for valid smb request type
|
2021-03-16 01:49:09 +00:00
|
|
|
* @conn: connection instance
|
|
|
|
*
|
|
|
|
* Return: true on success, otherwise false
|
|
|
|
*/
|
|
|
|
bool ksmbd_smb_request(struct ksmbd_conn *conn)
|
|
|
|
{
|
|
|
|
int type = *(char *)conn->request_buf;
|
|
|
|
|
|
|
|
switch (type) {
|
|
|
|
case RFC1002_SESSION_MESSAGE:
|
|
|
|
/* Regular SMB request */
|
|
|
|
return true;
|
|
|
|
case RFC1002_SESSION_KEEP_ALIVE:
|
|
|
|
ksmbd_debug(SMB, "RFC 1002 session keep alive\n");
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
ksmbd_debug(SMB, "RFC 1002 unknown request type 0x%x\n", type);
|
|
|
|
}
|
|
|
|
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
static bool supported_protocol(int idx)
|
|
|
|
{
|
|
|
|
if (idx == SMB2X_PROT &&
|
|
|
|
(server_conf.min_protocol >= SMB21_PROT ||
|
|
|
|
server_conf.max_protocol <= SMB311_PROT))
|
|
|
|
return true;
|
|
|
|
|
|
|
|
return (server_conf.min_protocol <= idx &&
|
2021-05-26 08:57:12 +00:00
|
|
|
idx <= server_conf.max_protocol);
|
2021-03-16 01:49:09 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static char *next_dialect(char *dialect, int *next_off)
|
|
|
|
{
|
|
|
|
dialect = dialect + *next_off;
|
|
|
|
*next_off = strlen(dialect);
|
|
|
|
return dialect;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int ksmbd_lookup_dialect_by_name(char *cli_dialects, __le16 byte_count)
|
|
|
|
{
|
|
|
|
int i, seq_num, bcount, next;
|
|
|
|
char *dialect;
|
|
|
|
|
|
|
|
for (i = ARRAY_SIZE(smb_protos) - 1; i >= 0; i--) {
|
|
|
|
seq_num = 0;
|
|
|
|
next = 0;
|
|
|
|
dialect = cli_dialects;
|
|
|
|
bcount = le16_to_cpu(byte_count);
|
|
|
|
do {
|
|
|
|
dialect = next_dialect(dialect, &next);
|
|
|
|
ksmbd_debug(SMB, "client requested dialect %s\n",
|
2021-05-26 08:57:12 +00:00
|
|
|
dialect);
|
2021-03-16 01:49:09 +00:00
|
|
|
if (!strcmp(dialect, smb_protos[i].name)) {
|
|
|
|
if (supported_protocol(smb_protos[i].index)) {
|
|
|
|
ksmbd_debug(SMB,
|
2021-05-26 08:57:12 +00:00
|
|
|
"selected %s dialect\n",
|
|
|
|
smb_protos[i].name);
|
2021-03-16 01:49:09 +00:00
|
|
|
if (smb_protos[i].index == SMB1_PROT)
|
|
|
|
return seq_num;
|
|
|
|
return smb_protos[i].prot_id;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
seq_num++;
|
|
|
|
bcount -= (++next);
|
|
|
|
} while (bcount > 0);
|
|
|
|
}
|
|
|
|
|
|
|
|
return BAD_PROT_ID;
|
|
|
|
}
|
|
|
|
|
|
|
|
int ksmbd_lookup_dialect_by_id(__le16 *cli_dialects, __le16 dialects_count)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
int count;
|
|
|
|
|
|
|
|
for (i = ARRAY_SIZE(smb_protos) - 1; i >= 0; i--) {
|
|
|
|
count = le16_to_cpu(dialects_count);
|
|
|
|
while (--count >= 0) {
|
|
|
|
ksmbd_debug(SMB, "client requested dialect 0x%x\n",
|
2021-05-26 08:57:12 +00:00
|
|
|
le16_to_cpu(cli_dialects[count]));
|
2021-03-16 01:49:09 +00:00
|
|
|
if (le16_to_cpu(cli_dialects[count]) !=
|
|
|
|
smb_protos[i].prot_id)
|
|
|
|
continue;
|
|
|
|
|
|
|
|
if (supported_protocol(smb_protos[i].index)) {
|
|
|
|
ksmbd_debug(SMB, "selected %s dialect\n",
|
2021-05-26 08:57:12 +00:00
|
|
|
smb_protos[i].name);
|
2021-03-16 01:49:09 +00:00
|
|
|
return smb_protos[i].prot_id;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return BAD_PROT_ID;
|
|
|
|
}
|
|
|
|
|
|
|
|
int ksmbd_negotiate_smb_dialect(void *buf)
|
|
|
|
{
|
|
|
|
__le32 proto;
|
|
|
|
|
|
|
|
proto = ((struct smb2_hdr *)buf)->ProtocolId;
|
|
|
|
if (proto == SMB2_PROTO_NUMBER) {
|
|
|
|
struct smb2_negotiate_req *req;
|
|
|
|
|
|
|
|
req = (struct smb2_negotiate_req *)buf;
|
|
|
|
return ksmbd_lookup_dialect_by_id(req->Dialects,
|
|
|
|
req->DialectCount);
|
|
|
|
}
|
|
|
|
|
|
|
|
proto = *(__le32 *)((struct smb_hdr *)buf)->Protocol;
|
|
|
|
if (proto == SMB1_PROTO_NUMBER) {
|
|
|
|
struct smb_negotiate_req *req;
|
|
|
|
|
|
|
|
req = (struct smb_negotiate_req *)buf;
|
|
|
|
return ksmbd_lookup_dialect_by_name(req->DialectsArray,
|
|
|
|
req->ByteCount);
|
|
|
|
}
|
|
|
|
|
|
|
|
return BAD_PROT_ID;
|
|
|
|
}
|
|
|
|
|
|
|
|
#define SMB_COM_NEGOTIATE 0x72
|
|
|
|
int ksmbd_init_smb_server(struct ksmbd_work *work)
|
|
|
|
{
|
|
|
|
struct ksmbd_conn *conn = work->conn;
|
|
|
|
|
|
|
|
if (conn->need_neg == false)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
init_smb3_11_server(conn);
|
|
|
|
|
|
|
|
if (conn->ops->get_cmd_val(work) != SMB_COM_NEGOTIATE)
|
|
|
|
conn->need_neg = false;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
bool ksmbd_pdu_size_has_room(unsigned int pdu)
|
|
|
|
{
|
|
|
|
return (pdu >= KSMBD_MIN_SUPPORTED_HEADER_SIZE - 4);
|
|
|
|
}
|
|
|
|
|
2021-03-30 05:25:35 +00:00
|
|
|
int ksmbd_populate_dot_dotdot_entries(struct ksmbd_work *work, int info_level,
|
2021-05-26 08:57:12 +00:00
|
|
|
struct ksmbd_file *dir,
|
|
|
|
struct ksmbd_dir_info *d_info,
|
|
|
|
char *search_pattern,
|
|
|
|
int (*fn)(struct ksmbd_conn *, int,
|
|
|
|
struct ksmbd_dir_info *,
|
|
|
|
struct ksmbd_kstat *))
|
2021-03-16 01:49:09 +00:00
|
|
|
{
|
|
|
|
int i, rc = 0;
|
|
|
|
struct ksmbd_conn *conn = work->conn;
|
|
|
|
|
|
|
|
for (i = 0; i < 2; i++) {
|
|
|
|
struct kstat kstat;
|
|
|
|
struct ksmbd_kstat ksmbd_kstat;
|
|
|
|
|
|
|
|
if (!dir->dot_dotdot[i]) { /* fill dot entry info */
|
|
|
|
if (i == 0) {
|
|
|
|
d_info->name = ".";
|
|
|
|
d_info->name_len = 1;
|
|
|
|
} else {
|
|
|
|
d_info->name = "..";
|
|
|
|
d_info->name_len = 2;
|
|
|
|
}
|
|
|
|
|
2021-03-21 08:32:19 +00:00
|
|
|
if (!match_pattern(d_info->name, d_info->name_len,
|
2021-03-30 05:25:35 +00:00
|
|
|
search_pattern)) {
|
2021-03-16 01:49:09 +00:00
|
|
|
dir->dot_dotdot[i] = 1;
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
|
|
|
|
ksmbd_kstat.kstat = &kstat;
|
|
|
|
ksmbd_vfs_fill_dentry_attrs(work,
|
2021-05-26 08:57:12 +00:00
|
|
|
dir->filp->f_path.dentry->d_parent,
|
|
|
|
&ksmbd_kstat);
|
2021-03-16 01:49:09 +00:00
|
|
|
rc = fn(conn, info_level, d_info, &ksmbd_kstat);
|
|
|
|
if (rc)
|
|
|
|
break;
|
|
|
|
if (d_info->out_buf_len <= 0)
|
|
|
|
break;
|
|
|
|
|
|
|
|
dir->dot_dotdot[i] = 1;
|
|
|
|
if (d_info->flags & SMB2_RETURN_SINGLE_ENTRY) {
|
|
|
|
d_info->out_buf_len = 0;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* ksmbd_extract_shortname() - get shortname from long filename
|
|
|
|
* @conn: connection instance
|
|
|
|
* @longname: source long filename
|
|
|
|
* @shortname: destination short filename
|
|
|
|
*
|
|
|
|
* Return: shortname length or 0 when source long name is '.' or '..'
|
|
|
|
* TODO: Though this function comforms the restriction of 8.3 Filename spec,
|
|
|
|
* but the result is different with Windows 7's one. need to check.
|
|
|
|
*/
|
2021-03-30 05:25:35 +00:00
|
|
|
int ksmbd_extract_shortname(struct ksmbd_conn *conn, const char *longname,
|
2021-05-26 08:57:12 +00:00
|
|
|
char *shortname)
|
2021-03-16 01:49:09 +00:00
|
|
|
{
|
|
|
|
const char *p;
|
|
|
|
char base[9], extension[4];
|
|
|
|
char out[13] = {0};
|
|
|
|
int baselen = 0;
|
|
|
|
int extlen = 0, len = 0;
|
|
|
|
unsigned int csum = 0;
|
|
|
|
const unsigned char *ptr;
|
|
|
|
bool dot_present = true;
|
|
|
|
|
|
|
|
p = longname;
|
|
|
|
if ((*p == '.') || (!(strcmp(p, "..")))) {
|
|
|
|
/*no mangling required */
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
p = strrchr(longname, '.');
|
|
|
|
if (p == longname) { /*name starts with a dot*/
|
|
|
|
strscpy(extension, "___", strlen("___"));
|
|
|
|
} else {
|
2021-03-30 05:25:35 +00:00
|
|
|
if (p) {
|
2021-03-16 01:49:09 +00:00
|
|
|
p++;
|
|
|
|
while (*p && extlen < 3) {
|
|
|
|
if (*p != '.')
|
|
|
|
extension[extlen++] = toupper(*p);
|
|
|
|
p++;
|
|
|
|
}
|
|
|
|
extension[extlen] = '\0';
|
2021-03-30 05:25:35 +00:00
|
|
|
} else {
|
2021-03-16 01:49:09 +00:00
|
|
|
dot_present = false;
|
2021-03-30 05:25:35 +00:00
|
|
|
}
|
2021-03-16 01:49:09 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
p = longname;
|
|
|
|
if (*p == '.') {
|
|
|
|
p++;
|
|
|
|
longname++;
|
|
|
|
}
|
|
|
|
while (*p && (baselen < 5)) {
|
|
|
|
if (*p != '.')
|
|
|
|
base[baselen++] = toupper(*p);
|
|
|
|
p++;
|
|
|
|
}
|
|
|
|
|
|
|
|
base[baselen] = MAGIC_CHAR;
|
2021-03-30 05:25:35 +00:00
|
|
|
memcpy(out, base, baselen + 1);
|
2021-03-16 01:49:09 +00:00
|
|
|
|
|
|
|
ptr = longname;
|
|
|
|
len = strlen(longname);
|
|
|
|
for (; len > 0; len--, ptr++)
|
|
|
|
csum += *ptr;
|
|
|
|
|
|
|
|
csum = csum % (MANGLE_BASE * MANGLE_BASE);
|
2021-03-30 05:25:35 +00:00
|
|
|
out[baselen + 1] = mangle(csum / MANGLE_BASE);
|
|
|
|
out[baselen + 2] = mangle(csum);
|
|
|
|
out[baselen + 3] = PERIOD;
|
2021-03-16 01:49:09 +00:00
|
|
|
|
|
|
|
if (dot_present)
|
2021-03-30 05:25:35 +00:00
|
|
|
memcpy(&out[baselen + 4], extension, 4);
|
2021-03-16 01:49:09 +00:00
|
|
|
else
|
2021-03-30 05:25:35 +00:00
|
|
|
out[baselen + 4] = '\0';
|
2021-03-16 01:49:09 +00:00
|
|
|
smbConvertToUTF16((__le16 *)shortname, out, PATH_MAX,
|
2021-05-26 08:57:12 +00:00
|
|
|
conn->local_nls, 0);
|
2021-03-16 01:49:09 +00:00
|
|
|
len = strlen(out) * 2;
|
|
|
|
return len;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int __smb2_negotiate(struct ksmbd_conn *conn)
|
|
|
|
{
|
|
|
|
return (conn->dialect >= SMB20_PROT_ID &&
|
2021-05-26 08:57:12 +00:00
|
|
|
conn->dialect <= SMB311_PROT_ID);
|
2021-03-16 01:49:09 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
static int smb_handle_negotiate(struct ksmbd_work *work)
|
|
|
|
{
|
2021-03-30 03:35:23 +00:00
|
|
|
struct smb_negotiate_rsp *neg_rsp = work->response_buf;
|
2021-03-16 01:49:09 +00:00
|
|
|
|
|
|
|
ksmbd_debug(SMB, "Unsupported SMB protocol\n");
|
|
|
|
neg_rsp->hdr.Status.CifsError = STATUS_INVALID_LOGON_TYPE;
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
int ksmbd_smb_negotiate_common(struct ksmbd_work *work, unsigned int command)
|
|
|
|
{
|
|
|
|
struct ksmbd_conn *conn = work->conn;
|
|
|
|
int ret;
|
|
|
|
|
2021-03-30 03:35:23 +00:00
|
|
|
conn->dialect = ksmbd_negotiate_smb_dialect(work->request_buf);
|
2021-03-16 01:49:09 +00:00
|
|
|
ksmbd_debug(SMB, "conn->dialect 0x%x\n", conn->dialect);
|
|
|
|
|
|
|
|
if (command == SMB2_NEGOTIATE_HE) {
|
2021-03-30 03:35:23 +00:00
|
|
|
struct smb2_hdr *smb2_hdr = work->request_buf;
|
2021-03-16 01:49:09 +00:00
|
|
|
|
|
|
|
if (smb2_hdr->ProtocolId != SMB2_PROTO_NUMBER) {
|
|
|
|
ksmbd_debug(SMB, "Downgrade to SMB1 negotiation\n");
|
|
|
|
command = SMB_COM_NEGOTIATE;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (command == SMB2_NEGOTIATE_HE) {
|
|
|
|
ret = smb2_handle_negotiate(work);
|
|
|
|
init_smb2_neg_rsp(work);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (command == SMB_COM_NEGOTIATE) {
|
|
|
|
if (__smb2_negotiate(conn)) {
|
|
|
|
conn->need_neg = true;
|
|
|
|
init_smb3_11_server(conn);
|
|
|
|
init_smb2_neg_rsp(work);
|
|
|
|
ksmbd_debug(SMB, "Upgrade to SMB2 negotiation\n");
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
return smb_handle_negotiate(work);
|
|
|
|
}
|
|
|
|
|
|
|
|
ksmbd_err("Unknown SMB negotiation command: %u\n", command);
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
|
|
|
enum SHARED_MODE_ERRORS {
|
|
|
|
SHARE_DELETE_ERROR,
|
|
|
|
SHARE_READ_ERROR,
|
|
|
|
SHARE_WRITE_ERROR,
|
|
|
|
FILE_READ_ERROR,
|
|
|
|
FILE_WRITE_ERROR,
|
|
|
|
FILE_DELETE_ERROR,
|
|
|
|
};
|
|
|
|
|
|
|
|
static const char * const shared_mode_errors[] = {
|
|
|
|
"Current access mode does not permit SHARE_DELETE",
|
|
|
|
"Current access mode does not permit SHARE_READ",
|
|
|
|
"Current access mode does not permit SHARE_WRITE",
|
|
|
|
"Desired access mode does not permit FILE_READ",
|
|
|
|
"Desired access mode does not permit FILE_WRITE",
|
|
|
|
"Desired access mode does not permit FILE_DELETE",
|
|
|
|
};
|
|
|
|
|
2021-03-30 05:25:35 +00:00
|
|
|
static void smb_shared_mode_error(int error, struct ksmbd_file *prev_fp,
|
2021-05-26 08:57:12 +00:00
|
|
|
struct ksmbd_file *curr_fp)
|
2021-03-16 01:49:09 +00:00
|
|
|
{
|
|
|
|
ksmbd_debug(SMB, "%s\n", shared_mode_errors[error]);
|
|
|
|
ksmbd_debug(SMB, "Current mode: 0x%x Desired mode: 0x%x\n",
|
2021-05-26 08:57:12 +00:00
|
|
|
prev_fp->saccess, curr_fp->daccess);
|
2021-03-16 01:49:09 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
int ksmbd_smb_check_shared_mode(struct file *filp, struct ksmbd_file *curr_fp)
|
|
|
|
{
|
|
|
|
int rc = 0;
|
|
|
|
struct ksmbd_file *prev_fp;
|
|
|
|
struct list_head *cur;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Lookup fp in master fp list, and check desired access and
|
|
|
|
* shared mode between previous open and current open.
|
|
|
|
*/
|
|
|
|
read_lock(&curr_fp->f_ci->m_lock);
|
|
|
|
list_for_each(cur, &curr_fp->f_ci->m_fp_list) {
|
|
|
|
prev_fp = list_entry(cur, struct ksmbd_file, node);
|
|
|
|
if (file_inode(filp) != FP_INODE(prev_fp))
|
|
|
|
continue;
|
|
|
|
|
|
|
|
if (filp == prev_fp->filp)
|
|
|
|
continue;
|
|
|
|
|
|
|
|
if (ksmbd_stream_fd(prev_fp) && ksmbd_stream_fd(curr_fp))
|
|
|
|
if (strcmp(prev_fp->stream.name, curr_fp->stream.name))
|
|
|
|
continue;
|
|
|
|
|
|
|
|
if (prev_fp->attrib_only != curr_fp->attrib_only)
|
|
|
|
continue;
|
|
|
|
|
|
|
|
if (!(prev_fp->saccess & FILE_SHARE_DELETE_LE) &&
|
2021-03-30 05:25:35 +00:00
|
|
|
curr_fp->daccess & FILE_DELETE_LE) {
|
2021-03-16 01:49:09 +00:00
|
|
|
smb_shared_mode_error(SHARE_DELETE_ERROR,
|
|
|
|
prev_fp,
|
|
|
|
curr_fp);
|
|
|
|
rc = -EPERM;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Only check FILE_SHARE_DELETE if stream opened and
|
|
|
|
* normal file opened.
|
|
|
|
*/
|
|
|
|
if (ksmbd_stream_fd(prev_fp) && !ksmbd_stream_fd(curr_fp))
|
|
|
|
continue;
|
|
|
|
|
|
|
|
if (!(prev_fp->saccess & FILE_SHARE_READ_LE) &&
|
2021-03-30 05:25:35 +00:00
|
|
|
curr_fp->daccess & (FILE_EXECUTE_LE | FILE_READ_DATA_LE)) {
|
2021-03-16 01:49:09 +00:00
|
|
|
smb_shared_mode_error(SHARE_READ_ERROR,
|
|
|
|
prev_fp,
|
|
|
|
curr_fp);
|
|
|
|
rc = -EPERM;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!(prev_fp->saccess & FILE_SHARE_WRITE_LE) &&
|
2021-03-30 05:25:35 +00:00
|
|
|
curr_fp->daccess & (FILE_WRITE_DATA_LE | FILE_APPEND_DATA_LE)) {
|
2021-03-16 01:49:09 +00:00
|
|
|
smb_shared_mode_error(SHARE_WRITE_ERROR,
|
|
|
|
prev_fp,
|
|
|
|
curr_fp);
|
|
|
|
rc = -EPERM;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
2021-03-30 05:25:35 +00:00
|
|
|
if (prev_fp->daccess & (FILE_EXECUTE_LE | FILE_READ_DATA_LE) &&
|
|
|
|
!(curr_fp->saccess & FILE_SHARE_READ_LE)) {
|
2021-03-16 01:49:09 +00:00
|
|
|
smb_shared_mode_error(FILE_READ_ERROR,
|
|
|
|
prev_fp,
|
|
|
|
curr_fp);
|
|
|
|
rc = -EPERM;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
2021-03-30 05:25:35 +00:00
|
|
|
if (prev_fp->daccess & (FILE_WRITE_DATA_LE | FILE_APPEND_DATA_LE) &&
|
|
|
|
!(curr_fp->saccess & FILE_SHARE_WRITE_LE)) {
|
2021-03-16 01:49:09 +00:00
|
|
|
smb_shared_mode_error(FILE_WRITE_ERROR,
|
|
|
|
prev_fp,
|
|
|
|
curr_fp);
|
|
|
|
rc = -EPERM;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (prev_fp->daccess & FILE_DELETE_LE &&
|
2021-03-30 05:25:35 +00:00
|
|
|
!(curr_fp->saccess & FILE_SHARE_DELETE_LE)) {
|
2021-03-16 01:49:09 +00:00
|
|
|
smb_shared_mode_error(FILE_DELETE_ERROR,
|
|
|
|
prev_fp,
|
|
|
|
curr_fp);
|
|
|
|
rc = -EPERM;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
read_unlock(&curr_fp->f_ci->m_lock);
|
|
|
|
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
bool is_asterisk(char *p)
|
|
|
|
{
|
|
|
|
return p && p[0] == '*';
|
|
|
|
}
|
|
|
|
|
|
|
|
int ksmbd_override_fsids(struct ksmbd_work *work)
|
|
|
|
{
|
|
|
|
struct ksmbd_session *sess = work->sess;
|
|
|
|
struct ksmbd_share_config *share = work->tcon->share_conf;
|
|
|
|
struct cred *cred;
|
|
|
|
struct group_info *gi;
|
|
|
|
unsigned int uid;
|
|
|
|
unsigned int gid;
|
|
|
|
|
|
|
|
uid = user_uid(sess->user);
|
|
|
|
gid = user_gid(sess->user);
|
|
|
|
if (share->force_uid != KSMBD_SHARE_INVALID_UID)
|
|
|
|
uid = share->force_uid;
|
|
|
|
if (share->force_gid != KSMBD_SHARE_INVALID_GID)
|
|
|
|
gid = share->force_gid;
|
|
|
|
|
|
|
|
cred = prepare_kernel_cred(NULL);
|
|
|
|
if (!cred)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
cred->fsuid = make_kuid(current_user_ns(), uid);
|
|
|
|
cred->fsgid = make_kgid(current_user_ns(), gid);
|
|
|
|
|
|
|
|
gi = groups_alloc(0);
|
|
|
|
if (!gi) {
|
|
|
|
abort_creds(cred);
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
set_groups(cred, gi);
|
|
|
|
put_group_info(gi);
|
|
|
|
|
|
|
|
if (!uid_eq(cred->fsuid, GLOBAL_ROOT_UID))
|
|
|
|
cred->cap_effective = cap_drop_fs_set(cred->cap_effective);
|
|
|
|
|
2021-03-30 05:25:35 +00:00
|
|
|
WARN_ON(work->saved_cred);
|
2021-03-16 01:49:09 +00:00
|
|
|
work->saved_cred = override_creds(cred);
|
|
|
|
if (!work->saved_cred) {
|
|
|
|
abort_creds(cred);
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
void ksmbd_revert_fsids(struct ksmbd_work *work)
|
|
|
|
{
|
|
|
|
const struct cred *cred;
|
|
|
|
|
2021-03-30 05:25:35 +00:00
|
|
|
WARN_ON(!work->saved_cred);
|
2021-03-16 01:49:09 +00:00
|
|
|
|
|
|
|
cred = current_cred();
|
|
|
|
revert_creds(work->saved_cred);
|
|
|
|
put_cred(cred);
|
|
|
|
work->saved_cred = NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
__le32 smb_map_generic_desired_access(__le32 daccess)
|
|
|
|
{
|
|
|
|
if (daccess & FILE_GENERIC_READ_LE) {
|
|
|
|
daccess |= cpu_to_le32(GENERIC_READ_FLAGS);
|
|
|
|
daccess &= ~FILE_GENERIC_READ_LE;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (daccess & FILE_GENERIC_WRITE_LE) {
|
|
|
|
daccess |= cpu_to_le32(GENERIC_WRITE_FLAGS);
|
|
|
|
daccess &= ~FILE_GENERIC_WRITE_LE;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (daccess & FILE_GENERIC_EXECUTE_LE) {
|
|
|
|
daccess |= cpu_to_le32(GENERIC_EXECUTE_FLAGS);
|
|
|
|
daccess &= ~FILE_GENERIC_EXECUTE_LE;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (daccess & FILE_GENERIC_ALL_LE) {
|
|
|
|
daccess |= cpu_to_le32(GENERIC_ALL_FLAGS);
|
|
|
|
daccess &= ~FILE_GENERIC_ALL_LE;
|
|
|
|
}
|
|
|
|
|
|
|
|
return daccess;
|
|
|
|
}
|