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https://github.com/samba-team/samba.git
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347c7af9e9
Signed-off-by: David Mulder <dmulder@suse.com> Reviewed-by: Jeremy Allison <jra@samba.org>
433 lines
11 KiB
C
433 lines
11 KiB
C
/*
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Unix SMB/CIFS implementation.
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Main SMB reply routines
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Copyright (C) Andrew Tridgell 1992-1998
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Copyright (C) Andrew Bartlett 2001
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Copyright (C) Jeremy Allison 1992-2007.
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Copyright (C) Volker Lendecke 2007
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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This file handles most of the reply_ calls that the server
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makes to handle specific protocols
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*/
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#include "includes.h"
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#include "libsmb/namequery.h"
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#include "system/filesys.h"
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#include "printing.h"
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#include "locking/share_mode_lock.h"
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#include "smbd/smbd.h"
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#include "smbd/globals.h"
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#include "smbd/smbXsrv_open.h"
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#include "fake_file.h"
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#include "rpc_client/rpc_client.h"
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#include "../librpc/gen_ndr/ndr_spoolss_c.h"
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#include "rpc_client/cli_spoolss.h"
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#include "rpc_client/init_spoolss.h"
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#include "rpc_server/rpc_ncacn_np.h"
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#include "libcli/security/security.h"
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#include "libsmb/nmblib.h"
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#include "auth.h"
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#include "smbprofile.h"
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#include "../lib/tsocket/tsocket.h"
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#include "lib/util/tevent_ntstatus.h"
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#include "libcli/smb/smb_signing.h"
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#include "lib/util/sys_rw_data.h"
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#include "librpc/gen_ndr/open_files.h"
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#include "smb1_utils.h"
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#include "libcli/smb/smb2_posix.h"
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#include "lib/util/string_wrappers.h"
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#include "source3/printing/rap_jobid.h"
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#include "source3/lib/substitute.h"
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/****************************************************************************
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Ensure we check the path in *exactly* the same way as W2K for a findfirst/findnext
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path or anything including wildcards.
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We're assuming here that '/' is not the second byte in any multibyte char
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set (a safe assumption). '\\' *may* be the second byte in a multibyte char
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set.
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****************************************************************************/
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/* Custom version for processing POSIX paths. */
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#define IS_PATH_SEP(c,posix_only) ((c) == '/' || (!(posix_only) && (c) == '\\'))
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static NTSTATUS check_path_syntax_internal(char *path,
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bool posix_path)
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{
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char *d = path;
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const char *s = path;
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NTSTATUS ret = NT_STATUS_OK;
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bool start_of_name_component = True;
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bool stream_started = false;
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bool last_component_contains_wcard = false;
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while (*s) {
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if (stream_started) {
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switch (*s) {
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case '/':
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case '\\':
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return NT_STATUS_OBJECT_NAME_INVALID;
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case ':':
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if (s[1] == '\0') {
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return NT_STATUS_OBJECT_NAME_INVALID;
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}
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if (strchr_m(&s[1], ':')) {
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return NT_STATUS_OBJECT_NAME_INVALID;
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}
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break;
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}
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}
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if ((*s == ':') && !posix_path && !stream_started) {
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if (last_component_contains_wcard) {
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return NT_STATUS_OBJECT_NAME_INVALID;
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}
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/* Stream names allow more characters than file names.
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We're overloading posix_path here to allow a wider
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range of characters. If stream_started is true this
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is still a Windows path even if posix_path is true.
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JRA.
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*/
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stream_started = true;
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start_of_name_component = false;
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posix_path = true;
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if (s[1] == '\0') {
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return NT_STATUS_OBJECT_NAME_INVALID;
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}
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}
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if (!stream_started && IS_PATH_SEP(*s,posix_path)) {
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/*
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* Safe to assume is not the second part of a mb char
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* as this is handled below.
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*/
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/* Eat multiple '/' or '\\' */
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while (IS_PATH_SEP(*s,posix_path)) {
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s++;
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}
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if ((d != path) && (*s != '\0')) {
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/* We only care about non-leading or trailing '/' or '\\' */
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*d++ = '/';
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}
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start_of_name_component = True;
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/* New component. */
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last_component_contains_wcard = false;
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continue;
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}
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if (start_of_name_component) {
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if ((s[0] == '.') && (s[1] == '.') && (IS_PATH_SEP(s[2],posix_path) || s[2] == '\0')) {
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/* Uh oh - "/../" or "\\..\\" or "/..\0" or "\\..\0" ! */
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/*
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* No mb char starts with '.' so we're safe checking the directory separator here.
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*/
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/* If we just added a '/' - delete it */
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if ((d > path) && (*(d-1) == '/')) {
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*(d-1) = '\0';
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d--;
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}
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/* Are we at the start ? Can't go back further if so. */
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if (d <= path) {
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ret = NT_STATUS_OBJECT_PATH_SYNTAX_BAD;
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break;
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}
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/* Go back one level... */
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/* We know this is safe as '/' cannot be part of a mb sequence. */
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/* NOTE - if this assumption is invalid we are not in good shape... */
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/* Decrement d first as d points to the *next* char to write into. */
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for (d--; d > path; d--) {
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if (*d == '/')
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break;
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}
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s += 2; /* Else go past the .. */
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/* We're still at the start of a name component, just the previous one. */
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continue;
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} else if ((s[0] == '.') && ((s[1] == '\0') || IS_PATH_SEP(s[1],posix_path))) {
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if (posix_path) {
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/* Eat the '.' */
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s++;
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continue;
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}
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}
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}
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if (!(*s & 0x80)) {
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if (!posix_path) {
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if (*s <= 0x1f || *s == '|') {
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return NT_STATUS_OBJECT_NAME_INVALID;
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}
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switch (*s) {
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case '*':
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case '?':
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case '<':
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case '>':
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case '"':
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last_component_contains_wcard = true;
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break;
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default:
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break;
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}
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}
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*d++ = *s++;
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} else {
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size_t siz;
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/* Get the size of the next MB character. */
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next_codepoint(s,&siz);
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switch(siz) {
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case 5:
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*d++ = *s++;
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FALL_THROUGH;
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case 4:
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*d++ = *s++;
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FALL_THROUGH;
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case 3:
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*d++ = *s++;
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FALL_THROUGH;
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case 2:
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*d++ = *s++;
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FALL_THROUGH;
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case 1:
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*d++ = *s++;
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break;
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default:
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DEBUG(0,("check_path_syntax_internal: character length assumptions invalid !\n"));
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*d = '\0';
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return NT_STATUS_INVALID_PARAMETER;
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}
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}
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start_of_name_component = False;
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}
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*d = '\0';
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return ret;
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}
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/****************************************************************************
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Ensure we check the path in *exactly* the same way as W2K for regular pathnames.
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No wildcards allowed.
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****************************************************************************/
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NTSTATUS check_path_syntax(char *path)
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{
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return check_path_syntax_internal(path, false);
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}
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/****************************************************************************
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Check the path for a POSIX client.
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We're assuming here that '/' is not the second byte in any multibyte char
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set (a safe assumption).
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****************************************************************************/
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NTSTATUS check_path_syntax_posix(char *path)
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{
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return check_path_syntax_internal(path, true);
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}
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/****************************************************************************
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Pull a string and check the path allowing a wildcard - provide for error return.
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Passes in posix flag.
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****************************************************************************/
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static size_t srvstr_get_path_internal(TALLOC_CTX *ctx,
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const char *base_ptr,
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uint16_t smb_flags2,
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char **pp_dest,
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const char *src,
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size_t src_len,
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int flags,
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bool posix_pathnames,
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NTSTATUS *err)
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{
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size_t ret;
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*pp_dest = NULL;
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ret = srvstr_pull_talloc(ctx, base_ptr, smb_flags2, pp_dest, src,
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src_len, flags);
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if (!*pp_dest) {
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*err = NT_STATUS_INVALID_PARAMETER;
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return ret;
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}
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if (smb_flags2 & FLAGS2_DFS_PATHNAMES) {
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/*
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* For a DFS path the function parse_dfs_path()
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* will do the path processing, just make a copy.
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*/
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*err = NT_STATUS_OK;
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return ret;
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}
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if (posix_pathnames) {
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*err = check_path_syntax_posix(*pp_dest);
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} else {
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*err = check_path_syntax(*pp_dest);
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}
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return ret;
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}
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/****************************************************************************
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Pull a string and check the path - provide for error return.
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****************************************************************************/
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size_t srvstr_get_path(TALLOC_CTX *ctx,
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const char *base_ptr,
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uint16_t smb_flags2,
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char **pp_dest,
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const char *src,
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size_t src_len,
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int flags,
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NTSTATUS *err)
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{
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return srvstr_get_path_internal(ctx,
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base_ptr,
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smb_flags2,
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pp_dest,
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src,
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src_len,
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flags,
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false,
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err);
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}
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/****************************************************************************
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Pull a string and check the path - provide for error return.
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posix_pathnames version.
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****************************************************************************/
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size_t srvstr_get_path_posix(TALLOC_CTX *ctx,
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const char *base_ptr,
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uint16_t smb_flags2,
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char **pp_dest,
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const char *src,
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size_t src_len,
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int flags,
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NTSTATUS *err)
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{
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return srvstr_get_path_internal(ctx,
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base_ptr,
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smb_flags2,
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pp_dest,
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src,
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src_len,
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flags,
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true,
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err);
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}
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size_t srvstr_get_path_req(TALLOC_CTX *mem_ctx, struct smb_request *req,
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char **pp_dest, const char *src, int flags,
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NTSTATUS *err)
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{
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ssize_t bufrem = smbreq_bufrem(req, src);
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if (bufrem < 0) {
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*err = NT_STATUS_INVALID_PARAMETER;
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return 0;
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}
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if (req->posix_pathnames) {
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return srvstr_get_path_internal(mem_ctx,
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(const char *)req->inbuf,
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req->flags2,
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pp_dest,
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src,
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bufrem,
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flags,
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true,
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err);
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} else {
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return srvstr_get_path_internal(mem_ctx,
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(const char *)req->inbuf,
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req->flags2,
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pp_dest,
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src,
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bufrem,
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flags,
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false,
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err);
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}
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}
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/**
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* pull a string from the smb_buf part of a packet. In this case the
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* string can either be null terminated or it can be terminated by the
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* end of the smbbuf area
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*/
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size_t srvstr_pull_req_talloc(TALLOC_CTX *ctx, struct smb_request *req,
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char **dest, const uint8_t *src, int flags)
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{
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ssize_t bufrem = smbreq_bufrem(req, src);
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if (bufrem < 0) {
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return 0;
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}
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return pull_string_talloc(ctx, req->inbuf, req->flags2, dest, src,
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bufrem, flags);
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}
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/****************************************************************************
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Check if we have a correct fsp pointing to a file. Basic check for open fsp.
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****************************************************************************/
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bool check_fsp_open(connection_struct *conn, struct smb_request *req,
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files_struct *fsp)
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{
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if ((fsp == NULL) || (conn == NULL)) {
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reply_nterror(req, NT_STATUS_INVALID_HANDLE);
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return False;
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}
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if ((conn != fsp->conn) || (req->vuid != fsp->vuid)) {
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reply_nterror(req, NT_STATUS_INVALID_HANDLE);
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return False;
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}
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return True;
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}
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/****************************************************************************
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Check if we have a correct fsp pointing to a file.
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****************************************************************************/
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bool check_fsp(connection_struct *conn, struct smb_request *req,
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files_struct *fsp)
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{
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if (!check_fsp_open(conn, req, fsp)) {
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return False;
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}
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if (fsp->fsp_flags.is_directory) {
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reply_nterror(req, NT_STATUS_INVALID_DEVICE_REQUEST);
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return False;
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}
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if (fsp_get_pathref_fd(fsp) == -1) {
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reply_nterror(req, NT_STATUS_ACCESS_DENIED);
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return False;
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}
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fsp->num_smb_operations++;
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return True;
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}
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