689 строки
15 KiB
C
689 строки
15 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2018 Samsung Electronics Co., Ltd.
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* Copyright (C) 2018 Namjae Jeon <linkinjeon@kernel.org>
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*/
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#include <linux/user_namespace.h>
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#include "smb_common.h"
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#include "server.h"
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#include "misc.h"
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#include "smbstatus.h"
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#include "connection.h"
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#include "ksmbd_work.h"
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#include "mgmt/user_session.h"
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#include "mgmt/user_config.h"
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#include "mgmt/tree_connect.h"
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#include "mgmt/share_config.h"
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/*for shortname implementation */
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static const char basechars[43] = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_-!@#$%";
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#define MANGLE_BASE (sizeof(basechars) / sizeof(char) - 1)
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#define MAGIC_CHAR '~'
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#define PERIOD '.'
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#define mangle(V) ((char)(basechars[(V) % MANGLE_BASE]))
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struct smb_protocol {
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int index;
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char *name;
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char *prot;
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__u16 prot_id;
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};
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static struct smb_protocol smb1_protos[] = {
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{
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SMB21_PROT,
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"\2SMB 2.1",
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"SMB2_10",
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SMB21_PROT_ID
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},
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{
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SMB2X_PROT,
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"\2SMB 2.???",
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"SMB2_22",
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SMB2X_PROT_ID
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},
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};
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static struct smb_protocol smb2_protos[] = {
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{
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SMB21_PROT,
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"\2SMB 2.1",
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"SMB2_10",
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SMB21_PROT_ID
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},
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{
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SMB30_PROT,
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"\2SMB 3.0",
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"SMB3_00",
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SMB30_PROT_ID
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},
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{
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SMB302_PROT,
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"\2SMB 3.02",
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"SMB3_02",
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SMB302_PROT_ID
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},
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{
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SMB311_PROT,
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"\2SMB 3.1.1",
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"SMB3_11",
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SMB311_PROT_ID
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},
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};
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unsigned int ksmbd_server_side_copy_max_chunk_count(void)
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{
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return 256;
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}
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unsigned int ksmbd_server_side_copy_max_chunk_size(void)
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{
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return (2U << 30) - 1;
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}
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unsigned int ksmbd_server_side_copy_max_total_size(void)
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{
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return (2U << 30) - 1;
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}
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inline int ksmbd_min_protocol(void)
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{
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return SMB21_PROT;
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}
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inline int ksmbd_max_protocol(void)
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{
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return SMB311_PROT;
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}
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int ksmbd_lookup_protocol_idx(char *str)
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{
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int offt = ARRAY_SIZE(smb1_protos) - 1;
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int len = strlen(str);
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while (offt >= 0) {
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if (!strncmp(str, smb1_protos[offt].prot, len)) {
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ksmbd_debug(SMB, "selected %s dialect idx = %d\n",
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smb1_protos[offt].prot, offt);
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return smb1_protos[offt].index;
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}
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offt--;
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}
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offt = ARRAY_SIZE(smb2_protos) - 1;
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while (offt >= 0) {
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if (!strncmp(str, smb2_protos[offt].prot, len)) {
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ksmbd_debug(SMB, "selected %s dialect idx = %d\n",
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smb2_protos[offt].prot, offt);
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return smb2_protos[offt].index;
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}
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offt--;
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}
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return -1;
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}
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/**
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* ksmbd_verify_smb_message() - check for valid smb2 request header
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* @work: smb work
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*
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* check for valid smb signature and packet direction(request/response)
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*
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* Return: 0 on success, otherwise -EINVAL
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*/
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int ksmbd_verify_smb_message(struct ksmbd_work *work)
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{
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struct smb2_hdr *smb2_hdr = ksmbd_req_buf_next(work);
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struct smb_hdr *hdr;
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if (smb2_hdr->ProtocolId == SMB2_PROTO_NUMBER)
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return ksmbd_smb2_check_message(work);
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hdr = work->request_buf;
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if (*(__le32 *)hdr->Protocol == SMB1_PROTO_NUMBER &&
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hdr->Command == SMB_COM_NEGOTIATE) {
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work->conn->outstanding_credits++;
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return 0;
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}
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return -EINVAL;
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}
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/**
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* ksmbd_smb_request() - check for valid smb request type
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* @conn: connection instance
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*
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* Return: true on success, otherwise false
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*/
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bool ksmbd_smb_request(struct ksmbd_conn *conn)
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{
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return conn->request_buf[0] == 0;
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}
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static bool supported_protocol(int idx)
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{
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if (idx == SMB2X_PROT &&
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(server_conf.min_protocol >= SMB21_PROT ||
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server_conf.max_protocol <= SMB311_PROT))
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return true;
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return (server_conf.min_protocol <= idx &&
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idx <= server_conf.max_protocol);
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}
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static char *next_dialect(char *dialect, int *next_off, int bcount)
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{
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dialect = dialect + *next_off;
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*next_off = strnlen(dialect, bcount);
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if (dialect[*next_off] != '\0')
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return NULL;
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return dialect;
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}
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static int ksmbd_lookup_dialect_by_name(char *cli_dialects, __le16 byte_count)
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{
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int i, seq_num, bcount, next;
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char *dialect;
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for (i = ARRAY_SIZE(smb1_protos) - 1; i >= 0; i--) {
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seq_num = 0;
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next = 0;
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dialect = cli_dialects;
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bcount = le16_to_cpu(byte_count);
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do {
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dialect = next_dialect(dialect, &next, bcount);
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if (!dialect)
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break;
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ksmbd_debug(SMB, "client requested dialect %s\n",
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dialect);
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if (!strcmp(dialect, smb1_protos[i].name)) {
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if (supported_protocol(smb1_protos[i].index)) {
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ksmbd_debug(SMB,
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"selected %s dialect\n",
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smb1_protos[i].name);
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if (smb1_protos[i].index == SMB1_PROT)
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return seq_num;
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return smb1_protos[i].prot_id;
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}
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}
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seq_num++;
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bcount -= (++next);
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} while (bcount > 0);
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}
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return BAD_PROT_ID;
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}
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int ksmbd_lookup_dialect_by_id(__le16 *cli_dialects, __le16 dialects_count)
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{
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int i;
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int count;
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for (i = ARRAY_SIZE(smb2_protos) - 1; i >= 0; i--) {
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count = le16_to_cpu(dialects_count);
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while (--count >= 0) {
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ksmbd_debug(SMB, "client requested dialect 0x%x\n",
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le16_to_cpu(cli_dialects[count]));
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if (le16_to_cpu(cli_dialects[count]) !=
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smb2_protos[i].prot_id)
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continue;
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if (supported_protocol(smb2_protos[i].index)) {
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ksmbd_debug(SMB, "selected %s dialect\n",
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smb2_protos[i].name);
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return smb2_protos[i].prot_id;
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}
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}
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}
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return BAD_PROT_ID;
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}
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static int ksmbd_negotiate_smb_dialect(void *buf)
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{
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int smb_buf_length = get_rfc1002_len(buf);
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__le32 proto = ((struct smb2_hdr *)smb2_get_msg(buf))->ProtocolId;
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if (proto == SMB2_PROTO_NUMBER) {
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struct smb2_negotiate_req *req;
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int smb2_neg_size =
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offsetof(struct smb2_negotiate_req, Dialects);
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req = (struct smb2_negotiate_req *)smb2_get_msg(buf);
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if (smb2_neg_size > smb_buf_length)
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goto err_out;
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if (smb2_neg_size + le16_to_cpu(req->DialectCount) * sizeof(__le16) >
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smb_buf_length)
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goto err_out;
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return ksmbd_lookup_dialect_by_id(req->Dialects,
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req->DialectCount);
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}
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proto = *(__le32 *)((struct smb_hdr *)buf)->Protocol;
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if (proto == SMB1_PROTO_NUMBER) {
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struct smb_negotiate_req *req;
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req = (struct smb_negotiate_req *)buf;
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if (le16_to_cpu(req->ByteCount) < 2)
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goto err_out;
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if (offsetof(struct smb_negotiate_req, DialectsArray) - 4 +
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le16_to_cpu(req->ByteCount) > smb_buf_length) {
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goto err_out;
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}
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return ksmbd_lookup_dialect_by_name(req->DialectsArray,
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req->ByteCount);
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}
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err_out:
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return BAD_PROT_ID;
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}
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int ksmbd_init_smb_server(struct ksmbd_work *work)
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{
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struct ksmbd_conn *conn = work->conn;
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if (conn->need_neg == false)
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return 0;
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init_smb3_11_server(conn);
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if (conn->ops->get_cmd_val(work) != SMB_COM_NEGOTIATE)
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conn->need_neg = false;
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return 0;
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}
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int ksmbd_populate_dot_dotdot_entries(struct ksmbd_work *work, int info_level,
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struct ksmbd_file *dir,
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struct ksmbd_dir_info *d_info,
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char *search_pattern,
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int (*fn)(struct ksmbd_conn *, int,
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struct ksmbd_dir_info *,
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struct ksmbd_kstat *))
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{
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int i, rc = 0;
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struct ksmbd_conn *conn = work->conn;
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struct user_namespace *user_ns = file_mnt_user_ns(dir->filp);
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for (i = 0; i < 2; i++) {
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struct kstat kstat;
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struct ksmbd_kstat ksmbd_kstat;
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struct dentry *dentry;
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if (!dir->dot_dotdot[i]) { /* fill dot entry info */
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if (i == 0) {
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d_info->name = ".";
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d_info->name_len = 1;
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dentry = dir->filp->f_path.dentry;
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} else {
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d_info->name = "..";
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d_info->name_len = 2;
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dentry = dir->filp->f_path.dentry->d_parent;
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}
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if (!match_pattern(d_info->name, d_info->name_len,
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search_pattern)) {
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dir->dot_dotdot[i] = 1;
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continue;
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}
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ksmbd_kstat.kstat = &kstat;
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ksmbd_vfs_fill_dentry_attrs(work,
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user_ns,
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dentry,
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&ksmbd_kstat);
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rc = fn(conn, info_level, d_info, &ksmbd_kstat);
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if (rc)
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break;
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if (d_info->out_buf_len <= 0)
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break;
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dir->dot_dotdot[i] = 1;
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if (d_info->flags & SMB2_RETURN_SINGLE_ENTRY) {
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d_info->out_buf_len = 0;
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break;
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}
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}
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}
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return rc;
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}
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/**
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* ksmbd_extract_shortname() - get shortname from long filename
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* @conn: connection instance
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* @longname: source long filename
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* @shortname: destination short filename
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*
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* Return: shortname length or 0 when source long name is '.' or '..'
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* TODO: Though this function comforms the restriction of 8.3 Filename spec,
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* but the result is different with Windows 7's one. need to check.
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*/
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int ksmbd_extract_shortname(struct ksmbd_conn *conn, const char *longname,
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char *shortname)
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{
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const char *p;
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char base[9], extension[4];
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char out[13] = {0};
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int baselen = 0;
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int extlen = 0, len = 0;
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unsigned int csum = 0;
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const unsigned char *ptr;
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bool dot_present = true;
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p = longname;
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if ((*p == '.') || (!(strcmp(p, "..")))) {
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/*no mangling required */
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return 0;
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}
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p = strrchr(longname, '.');
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if (p == longname) { /*name starts with a dot*/
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strscpy(extension, "___", strlen("___"));
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} else {
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if (p) {
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p++;
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while (*p && extlen < 3) {
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if (*p != '.')
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extension[extlen++] = toupper(*p);
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p++;
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}
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extension[extlen] = '\0';
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} else {
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dot_present = false;
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}
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}
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p = longname;
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if (*p == '.') {
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p++;
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longname++;
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}
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while (*p && (baselen < 5)) {
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if (*p != '.')
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base[baselen++] = toupper(*p);
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p++;
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}
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base[baselen] = MAGIC_CHAR;
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memcpy(out, base, baselen + 1);
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ptr = longname;
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len = strlen(longname);
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for (; len > 0; len--, ptr++)
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csum += *ptr;
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csum = csum % (MANGLE_BASE * MANGLE_BASE);
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out[baselen + 1] = mangle(csum / MANGLE_BASE);
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out[baselen + 2] = mangle(csum);
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out[baselen + 3] = PERIOD;
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if (dot_present)
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memcpy(&out[baselen + 4], extension, 4);
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else
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out[baselen + 4] = '\0';
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smbConvertToUTF16((__le16 *)shortname, out, PATH_MAX,
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conn->local_nls, 0);
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len = strlen(out) * 2;
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return len;
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}
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static int __smb2_negotiate(struct ksmbd_conn *conn)
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{
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return (conn->dialect >= SMB21_PROT_ID &&
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conn->dialect <= SMB311_PROT_ID);
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}
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static int smb_handle_negotiate(struct ksmbd_work *work)
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{
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struct smb_negotiate_rsp *neg_rsp = work->response_buf;
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ksmbd_debug(SMB, "Unsupported SMB protocol\n");
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neg_rsp->hdr.Status.CifsError = STATUS_INVALID_LOGON_TYPE;
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return -EINVAL;
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}
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int ksmbd_smb_negotiate_common(struct ksmbd_work *work, unsigned int command)
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{
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struct ksmbd_conn *conn = work->conn;
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int ret;
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conn->dialect =
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ksmbd_negotiate_smb_dialect(work->request_buf);
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ksmbd_debug(SMB, "conn->dialect 0x%x\n", conn->dialect);
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if (command == SMB2_NEGOTIATE_HE) {
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struct smb2_hdr *smb2_hdr = smb2_get_msg(work->request_buf);
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if (smb2_hdr->ProtocolId != SMB2_PROTO_NUMBER) {
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ksmbd_debug(SMB, "Downgrade to SMB1 negotiation\n");
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command = SMB_COM_NEGOTIATE;
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}
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}
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if (command == SMB2_NEGOTIATE_HE && __smb2_negotiate(conn)) {
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ret = smb2_handle_negotiate(work);
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init_smb2_neg_rsp(work);
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return ret;
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}
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if (command == SMB_COM_NEGOTIATE) {
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if (__smb2_negotiate(conn)) {
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conn->need_neg = true;
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init_smb3_11_server(conn);
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init_smb2_neg_rsp(work);
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ksmbd_debug(SMB, "Upgrade to SMB2 negotiation\n");
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return 0;
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}
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return smb_handle_negotiate(work);
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}
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pr_err("Unknown SMB negotiation command: %u\n", command);
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return -EINVAL;
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}
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enum SHARED_MODE_ERRORS {
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SHARE_DELETE_ERROR,
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SHARE_READ_ERROR,
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SHARE_WRITE_ERROR,
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FILE_READ_ERROR,
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FILE_WRITE_ERROR,
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FILE_DELETE_ERROR,
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};
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static const char * const shared_mode_errors[] = {
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"Current access mode does not permit SHARE_DELETE",
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"Current access mode does not permit SHARE_READ",
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"Current access mode does not permit SHARE_WRITE",
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"Desired access mode does not permit FILE_READ",
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"Desired access mode does not permit FILE_WRITE",
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"Desired access mode does not permit FILE_DELETE",
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};
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static void smb_shared_mode_error(int error, struct ksmbd_file *prev_fp,
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struct ksmbd_file *curr_fp)
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{
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ksmbd_debug(SMB, "%s\n", shared_mode_errors[error]);
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ksmbd_debug(SMB, "Current mode: 0x%x Desired mode: 0x%x\n",
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prev_fp->saccess, curr_fp->daccess);
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}
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int ksmbd_smb_check_shared_mode(struct file *filp, struct ksmbd_file *curr_fp)
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{
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int rc = 0;
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struct ksmbd_file *prev_fp;
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/*
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|
* 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_entry(prev_fp, &curr_fp->f_ci->m_fp_list, node) {
|
|
if (file_inode(filp) != file_inode(prev_fp->filp))
|
|
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) &&
|
|
curr_fp->daccess & FILE_DELETE_LE) {
|
|
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) &&
|
|
curr_fp->daccess & (FILE_EXECUTE_LE | FILE_READ_DATA_LE)) {
|
|
smb_shared_mode_error(SHARE_READ_ERROR,
|
|
prev_fp,
|
|
curr_fp);
|
|
rc = -EPERM;
|
|
break;
|
|
}
|
|
|
|
if (!(prev_fp->saccess & FILE_SHARE_WRITE_LE) &&
|
|
curr_fp->daccess & (FILE_WRITE_DATA_LE | FILE_APPEND_DATA_LE)) {
|
|
smb_shared_mode_error(SHARE_WRITE_ERROR,
|
|
prev_fp,
|
|
curr_fp);
|
|
rc = -EPERM;
|
|
break;
|
|
}
|
|
|
|
if (prev_fp->daccess & (FILE_EXECUTE_LE | FILE_READ_DATA_LE) &&
|
|
!(curr_fp->saccess & FILE_SHARE_READ_LE)) {
|
|
smb_shared_mode_error(FILE_READ_ERROR,
|
|
prev_fp,
|
|
curr_fp);
|
|
rc = -EPERM;
|
|
break;
|
|
}
|
|
|
|
if (prev_fp->daccess & (FILE_WRITE_DATA_LE | FILE_APPEND_DATA_LE) &&
|
|
!(curr_fp->saccess & FILE_SHARE_WRITE_LE)) {
|
|
smb_shared_mode_error(FILE_WRITE_ERROR,
|
|
prev_fp,
|
|
curr_fp);
|
|
rc = -EPERM;
|
|
break;
|
|
}
|
|
|
|
if (prev_fp->daccess & FILE_DELETE_LE &&
|
|
!(curr_fp->saccess & FILE_SHARE_DELETE_LE)) {
|
|
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(&init_task);
|
|
if (!cred)
|
|
return -ENOMEM;
|
|
|
|
cred->fsuid = make_kuid(&init_user_ns, uid);
|
|
cred->fsgid = make_kgid(&init_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);
|
|
|
|
WARN_ON(work->saved_cred);
|
|
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;
|
|
|
|
WARN_ON(!work->saved_cred);
|
|
|
|
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;
|
|
}
|