| 1 | /*
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| 2 | Unix SMB/CIFS implementation.
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| 3 | Core SMB2 server
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| 4 |
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| 5 | Copyright (C) Stefan Metzmacher 2009
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| 6 |
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| 7 | This program is free software; you can redistribute it and/or modify
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| 8 | it under the terms of the GNU General Public License as published by
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| 9 | the Free Software Foundation; either version 3 of the License, or
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| 10 | (at your option) any later version.
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| 11 |
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| 12 | This program is distributed in the hope that it will be useful,
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| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 15 | GNU General Public License for more details.
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| 16 |
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| 17 | You should have received a copy of the GNU General Public License
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| 18 | along with this program. If not, see <http://www.gnu.org/licenses/>.
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| 19 | */
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| 20 |
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| 21 | #include "includes.h"
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| 22 | #include "smbd/smbd.h"
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| 23 | #include "smbd/globals.h"
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| 24 | #include "../libcli/smb/smb_common.h"
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| 25 |
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| 26 | struct smb_request *smbd_smb2_fake_smb_request(struct smbd_smb2_request *req)
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| 27 | {
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| 28 | struct smb_request *smbreq;
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| 29 | const uint8_t *inhdr = SMBD_SMB2_IN_HDR_PTR(req);
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| 30 |
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| 31 | if (req->smb1req) {
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| 32 | smbreq = req->smb1req;
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| 33 | } else {
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| 34 | smbreq = talloc_zero(req, struct smb_request);
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| 35 | if (smbreq == NULL) {
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| 36 | return NULL;
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| 37 | }
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| 38 | }
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| 39 |
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| 40 | smbreq->request_time = req->request_time;
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| 41 | smbreq->vuid = req->session->compat->vuid;
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| 42 | smbreq->tid = req->tcon->compat->cnum;
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| 43 | smbreq->conn = req->tcon->compat;
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| 44 | smbreq->sconn = req->sconn;
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| 45 | smbreq->xconn = req->xconn;
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| 46 | smbreq->smbpid = (uint16_t)IVAL(inhdr, SMB2_HDR_PID);
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| 47 | smbreq->flags2 = FLAGS2_UNICODE_STRINGS |
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| 48 | FLAGS2_32_BIT_ERROR_CODES |
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| 49 | FLAGS2_LONG_PATH_COMPONENTS |
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| 50 | FLAGS2_IS_LONG_NAME;
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| 51 |
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| 52 | /* This is not documented in revision 49 of [MS-SMB2] but should be
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| 53 | * added in a later revision (and torture test smb2.read.access
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| 54 | * as well as smb2.ioctl_copy_chunk_bad_access against
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| 55 | * Server 2012R2 confirms this)
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| 56 | *
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| 57 | * If FILE_EXECUTE is granted to a handle then the SMB2 server
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| 58 | * acts as if FILE_READ_DATA has also been granted. We must still
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| 59 | * keep the original granted mask, because with ioctl requests,
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| 60 | * access checks are made on the file handle, "below" the SMB2
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| 61 | * server, and the object store below the SMB layer is not aware
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| 62 | * of this arrangement (see smb2.ioctl.copy_chunk_bad_access
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| 63 | * torture test).
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| 64 | */
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| 65 | smbreq->flags2 |= FLAGS2_READ_PERMIT_EXECUTE;
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| 66 |
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| 67 | if (IVAL(inhdr, SMB2_HDR_FLAGS) & SMB2_HDR_FLAG_DFS) {
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| 68 | smbreq->flags2 |= FLAGS2_DFS_PATHNAMES;
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| 69 | }
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| 70 | smbreq->mid = BVAL(inhdr, SMB2_HDR_MESSAGE_ID);
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| 71 | smbreq->chain_fsp = req->compat_chain_fsp;
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| 72 | smbreq->smb2req = req;
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| 73 | req->smb1req = smbreq;
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| 74 |
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| 75 | return smbreq;
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| 76 | }
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| 77 |
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| 78 | /*********************************************************
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| 79 | Are there unread bytes for recvfile ?
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| 80 | *********************************************************/
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| 81 |
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| 82 | size_t smbd_smb2_unread_bytes(struct smbd_smb2_request *req)
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| 83 | {
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| 84 | if (req->smb1req) {
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| 85 | return req->smb1req->unread_bytes;
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| 86 | }
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| 87 | return 0;
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| 88 | }
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| 89 |
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| 90 | /*********************************************************
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| 91 | Called from file_free() to remove any chained fsp pointers.
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| 92 | *********************************************************/
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| 93 |
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| 94 | void remove_smb2_chained_fsp(files_struct *fsp)
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| 95 | {
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| 96 | struct smbd_server_connection *sconn = fsp->conn->sconn;
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| 97 | struct smbXsrv_connection *xconn = NULL;
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| 98 |
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| 99 | if (sconn->client != NULL) {
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| 100 | xconn = sconn->client->connections;
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| 101 | }
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| 102 |
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| 103 | for (; xconn != NULL; xconn = xconn->next) {
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| 104 | struct smbd_smb2_request *smb2req;
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| 105 |
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| 106 | for (smb2req = xconn->smb2.requests; smb2req; smb2req = smb2req->next) {
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| 107 | if (smb2req->compat_chain_fsp == fsp) {
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| 108 | smb2req->compat_chain_fsp = NULL;
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| 109 | }
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| 110 | if (smb2req->smb1req && smb2req->smb1req->chain_fsp == fsp) {
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| 111 | smb2req->smb1req->chain_fsp = NULL;
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| 112 | }
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| 113 | }
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| 114 | }
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| 115 | }
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