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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2018 Samsung Electronics Co., Ltd.
*/
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/rwsem.h>
#include <linux/xarray.h>
#include "ksmbd_ida.h"
#include "user_session.h"
#include "user_config.h"
#include "tree_connect.h"
#include "../transport_ipc.h"
#include "../connection.h"
#include "../vfs_cache.h"
static DEFINE_IDA(session_ida);
#define SESSION_HASH_BITS 3
static DEFINE_HASHTABLE(sessions_table, SESSION_HASH_BITS);
static DECLARE_RWSEM(sessions_table_lock);
struct ksmbd_session_rpc {
int id;
unsigned int method;
};
static void free_channel_list(struct ksmbd_session *sess)
{
struct channel *chann;
unsigned long index;
xa_for_each(&sess->ksmbd_chann_list, index, chann) {
xa_erase(&sess->ksmbd_chann_list, index);
kfree(chann);
}
xa_destroy(&sess->ksmbd_chann_list);
}
static void __session_rpc_close(struct ksmbd_session *sess,
struct ksmbd_session_rpc *entry)
{
struct ksmbd_rpc_command *resp;
resp = ksmbd_rpc_close(sess, entry->id);
if (!resp)
pr_err("Unable to close RPC pipe %d\n", entry->id);
kvfree(resp);
ksmbd_rpc_id_free(entry->id);
kfree(entry);
}
static void ksmbd_session_rpc_clear_list(struct ksmbd_session *sess)
{
struct ksmbd_session_rpc *entry;
long index;
xa_for_each(&sess->rpc_handle_list, index, entry) {
xa_erase(&sess->rpc_handle_list, index);
__session_rpc_close(sess, entry);
}
xa_destroy(&sess->rpc_handle_list);
}
static int __rpc_method(char *rpc_name)
{
if (!strcmp(rpc_name, "\\srvsvc") || !strcmp(rpc_name, "srvsvc"))
return KSMBD_RPC_SRVSVC_METHOD_INVOKE;
if (!strcmp(rpc_name, "\\wkssvc") || !strcmp(rpc_name, "wkssvc"))
return KSMBD_RPC_WKSSVC_METHOD_INVOKE;
if (!strcmp(rpc_name, "LANMAN") || !strcmp(rpc_name, "lanman"))
return KSMBD_RPC_RAP_METHOD;
if (!strcmp(rpc_name, "\\samr") || !strcmp(rpc_name, "samr"))
return KSMBD_RPC_SAMR_METHOD_INVOKE;
if (!strcmp(rpc_name, "\\lsarpc") || !strcmp(rpc_name, "lsarpc"))
return KSMBD_RPC_LSARPC_METHOD_INVOKE;
pr_err("Unsupported RPC: %s\n", rpc_name);
return 0;
}
int ksmbd_session_rpc_open(struct ksmbd_session *sess, char *rpc_name)
{
struct ksmbd_session_rpc *entry;
struct ksmbd_rpc_command *resp;
int method;
method = __rpc_method(rpc_name);
if (!method)
return -EINVAL;
entry = kzalloc(sizeof(struct ksmbd_session_rpc), GFP_KERNEL);
if (!entry)
return -ENOMEM;
entry->method = method;
entry->id = ksmbd_ipc_id_alloc();
if (entry->id < 0)
goto free_entry;
xa_store(&sess->rpc_handle_list, entry->id, entry, GFP_KERNEL);
resp = ksmbd_rpc_open(sess, entry->id);
if (!resp)
goto free_id;
kvfree(resp);
return entry->id;
free_id:
xa_erase(&sess->rpc_handle_list, entry->id);
ksmbd_rpc_id_free(entry->id);
free_entry:
kfree(entry);
return -EINVAL;
}
void ksmbd_session_rpc_close(struct ksmbd_session *sess, int id)
{
struct ksmbd_session_rpc *entry;
entry = xa_erase(&sess->rpc_handle_list, id);
if (entry)
__session_rpc_close(sess, entry);
}
int ksmbd_session_rpc_method(struct ksmbd_session *sess, int id)
{
struct ksmbd_session_rpc *entry;
entry = xa_load(&sess->rpc_handle_list, id);
return entry ? entry->method : 0;
}
void ksmbd_session_destroy(struct ksmbd_session *sess)
{
if (!sess)
return;
if (sess->user)
ksmbd_free_user(sess->user);
ksmbd_tree_conn_session_logoff(sess);
ksmbd_destroy_file_table(&sess->file_table);
ksmbd_session_rpc_clear_list(sess);
free_channel_list(sess);
kfree(sess->Preauth_HashValue);
ksmbd_release_id(&session_ida, sess->id);
kfree(sess);
}
struct ksmbd_session *__session_lookup(unsigned long long id)
{
struct ksmbd_session *sess;
hash_for_each_possible(sessions_table, sess, hlist, id) {
if (id == sess->id) {
sess->last_active = jiffies;
return sess;
}
}
return NULL;
}
static void ksmbd_expire_session(struct ksmbd_conn *conn)
{
unsigned long id;
struct ksmbd_session *sess;
down_write(&conn->session_lock);
xa_for_each(&conn->sessions, id, sess) {
if (sess->state != SMB2_SESSION_VALID ||
time_after(jiffies,
sess->last_active + SMB2_SESSION_TIMEOUT)) {
xa_erase(&conn->sessions, sess->id);
hash_del(&sess->hlist);
ksmbd_session_destroy(sess);
continue;
}
}
up_write(&conn->session_lock);
}
int ksmbd_session_register(struct ksmbd_conn *conn,
struct ksmbd_session *sess)
{
sess->dialect = conn->dialect;
memcpy(sess->ClientGUID, conn->ClientGUID, SMB2_CLIENT_GUID_SIZE);
ksmbd_expire_session(conn);
return xa_err(xa_store(&conn->sessions, sess->id, sess, GFP_KERNEL));
}
static int ksmbd_chann_del(struct ksmbd_conn *conn, struct ksmbd_session *sess)
{
struct channel *chann;
chann = xa_erase(&sess->ksmbd_chann_list, (long)conn);
if (!chann)
return -ENOENT;
kfree(chann);
return 0;
}
void ksmbd_sessions_deregister(struct ksmbd_conn *conn)
{
struct ksmbd_session *sess;
unsigned long id;
down_write(&sessions_table_lock);
if (conn->binding) {
int bkt;
struct hlist_node *tmp;
hash_for_each_safe(sessions_table, bkt, tmp, sess, hlist) {
if (!ksmbd_chann_del(conn, sess) &&
xa_empty(&sess->ksmbd_chann_list)) {
hash_del(&sess->hlist);
ksmbd_session_destroy(sess);
}
}
}
up_write(&sessions_table_lock);
down_write(&conn->session_lock);
xa_for_each(&conn->sessions, id, sess) {
unsigned long chann_id;
struct channel *chann;
xa_for_each(&sess->ksmbd_chann_list, chann_id, chann) {
if (chann->conn != conn)
ksmbd_conn_set_exiting(chann->conn);
}
ksmbd_chann_del(conn, sess);
if (xa_empty(&sess->ksmbd_chann_list)) {
xa_erase(&conn->sessions, sess->id);
hash_del(&sess->hlist);
ksmbd_session_destroy(sess);
}
}
up_write(&conn->session_lock);
}
struct ksmbd_session *ksmbd_session_lookup(struct ksmbd_conn *conn,
unsigned long long id)
{
struct ksmbd_session *sess;
down_read(&conn->session_lock);
sess = xa_load(&conn->sessions, id);
if (sess)
sess->last_active = jiffies;
up_read(&conn->session_lock);
return sess;
}
struct ksmbd_session *ksmbd_session_lookup_slowpath(unsigned long long id)
{
struct ksmbd_session *sess;
down_read(&sessions_table_lock);
sess = __session_lookup(id);
if (sess)
sess->last_active = jiffies;
up_read(&sessions_table_lock);
return sess;
}
struct ksmbd_session *ksmbd_session_lookup_all(struct ksmbd_conn *conn,
unsigned long long id)
{
struct ksmbd_session *sess;
sess = ksmbd_session_lookup(conn, id);
if (!sess && conn->binding)
sess = ksmbd_session_lookup_slowpath(id);
if (sess && sess->state != SMB2_SESSION_VALID)
sess = NULL;
return sess;
}
struct preauth_session *ksmbd_preauth_session_alloc(struct ksmbd_conn *conn,
u64 sess_id)
{
struct preauth_session *sess;
sess = kmalloc(sizeof(struct preauth_session), GFP_KERNEL);
if (!sess)
return NULL;
sess->id = sess_id;
memcpy(sess->Preauth_HashValue, conn->preauth_info->Preauth_HashValue,
PREAUTH_HASHVALUE_SIZE);
list_add(&sess->preauth_entry, &conn->preauth_sess_table);
return sess;
}
void destroy_previous_session(struct ksmbd_conn *conn,
struct ksmbd_user *user, u64 id)
{
struct ksmbd_session *prev_sess;
struct ksmbd_user *prev_user;
down_write(&sessions_table_lock);
down_write(&conn->session_lock);
prev_sess = __session_lookup(id);
if (!prev_sess || prev_sess->state == SMB2_SESSION_EXPIRED)
goto out;
prev_user = prev_sess->user;
if (!prev_user ||
strcmp(user->name, prev_user->name) ||
user->passkey_sz != prev_user->passkey_sz ||
memcmp(user->passkey, prev_user->passkey, user->passkey_sz))
goto out;
prev_sess->state = SMB2_SESSION_EXPIRED;
out:
up_write(&conn->session_lock);
up_write(&sessions_table_lock);
}
static bool ksmbd_preauth_session_id_match(struct preauth_session *sess,
unsigned long long id)
{
return sess->id == id;
}
struct preauth_session *ksmbd_preauth_session_lookup(struct ksmbd_conn *conn,
unsigned long long id)
{
struct preauth_session *sess = NULL;
list_for_each_entry(sess, &conn->preauth_sess_table, preauth_entry) {
if (ksmbd_preauth_session_id_match(sess, id))
return sess;
}
return NULL;
}
static int __init_smb2_session(struct ksmbd_session *sess)
{
int id = ksmbd_acquire_smb2_uid(&session_ida);
if (id < 0)
return -EINVAL;
sess->id = id;
return 0;
}
static struct ksmbd_session *__session_create(int protocol)
{
struct ksmbd_session *sess;
int ret;
if (protocol != CIFDS_SESSION_FLAG_SMB2)
return NULL;
sess = kzalloc(sizeof(struct ksmbd_session), GFP_KERNEL);
if (!sess)
return NULL;
if (ksmbd_init_file_table(&sess->file_table))
goto error;
sess->last_active = jiffies;
sess->state = SMB2_SESSION_IN_PROGRESS;
set_session_flag(sess, protocol);
xa_init(&sess->tree_conns);
xa_init(&sess->ksmbd_chann_list);
xa_init(&sess->rpc_handle_list);
sess->sequence_number = 1;
rwlock_init(&sess->tree_conns_lock);
ret = __init_smb2_session(sess);
if (ret)
goto error;
ida_init(&sess->tree_conn_ida);
down_write(&sessions_table_lock);
hash_add(sessions_table, &sess->hlist, sess->id);
up_write(&sessions_table_lock);
return sess;
error:
ksmbd_session_destroy(sess);
return NULL;
}
struct ksmbd_session *ksmbd_smb2_session_create(void)
{
return __session_create(CIFDS_SESSION_FLAG_SMB2);
}
int ksmbd_acquire_tree_conn_id(struct ksmbd_session *sess)
{
int id = -EINVAL;
if (test_session_flag(sess, CIFDS_SESSION_FLAG_SMB2))
id = ksmbd_acquire_smb2_tid(&sess->tree_conn_ida);
return id;
}
void ksmbd_release_tree_conn_id(struct ksmbd_session *sess, int id)
{
if (id >= 0)
ksmbd_release_id(&sess->tree_conn_ida, id);
}
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