| 1 | /*
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| 2 | Unix SMB/CIFS implementation.
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| 3 | error packet handling
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| 4 | Copyright (C) Andrew Tridgell 1992-1998
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| 5 |
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| 6 | This program is free software; you can redistribute it and/or modify
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| 7 | it under the terms of the GNU General Public License as published by
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| 8 | the Free Software Foundation; either version 3 of the License, or
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| 9 | (at your option) any later version.
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| 10 |
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| 11 | This program is distributed in the hope that it will be useful,
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| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 14 | GNU General Public License for more details.
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| 15 |
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| 16 | You should have received a copy of the GNU General Public License
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| 17 | along with this program. If not, see <http://www.gnu.org/licenses/>.
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| 18 | */
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| 19 |
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| 20 | #include "includes.h"
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| 21 | #include "smbd/globals.h"
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| 22 |
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| 23 | /* From lib/error.c */
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| 24 | extern struct unix_error_map unix_dos_nt_errmap[];
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| 25 |
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| 26 | bool use_nt_status(void)
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| 27 | {
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| 28 | return lp_nt_status_support() && (global_client_caps & CAP_STATUS32);
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| 29 | }
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| 30 |
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| 31 | /****************************************************************************
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| 32 | Create an error packet. Normally called using the ERROR() macro.
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| 33 |
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| 34 | Setting eclass and ecode to zero and status to a valid NT error will
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| 35 | reply with an NT error if the client supports CAP_STATUS32, otherwise
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| 36 | it maps to and returns a DOS error if the client doesn't support CAP_STATUS32.
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| 37 | This is the normal mode of calling this function via reply_nterror(req, status).
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| 38 |
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| 39 | Setting eclass and ecode to non-zero and status to NT_STATUS_OK (0) will map
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| 40 | from a DOS error to an NT error and reply with an NT error if the client
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| 41 | supports CAP_STATUS32, otherwise it replies with the given DOS error.
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| 42 | This mode is currently not used in the server.
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| 43 |
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| 44 | Setting both eclass, ecode and status to non-zero values allows a non-default
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| 45 | mapping from NT error codes to DOS error codes, and will return one or the
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| 46 | other depending on the client supporting CAP_STATUS32 or not. This is the
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| 47 | path taken by calling reply_botherror(req, eclass, ecode, status);
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| 48 |
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| 49 | Setting status to NT_STATUS_DOS(eclass, ecode) forces DOS errors even if the
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| 50 | client supports CAP_STATUS32. This is the path taken to force a DOS error
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| 51 | reply by calling reply_force_doserror(req, eclass, ecode).
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| 52 |
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| 53 | Setting status only and eclass to -1 forces NT errors even if the client
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| 54 | doesn't support CAP_STATUS32. This mode is currently never used in the
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| 55 | server.
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| 56 | ****************************************************************************/
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| 57 |
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| 58 | void error_packet_set(char *outbuf, uint8 eclass, uint32 ecode, NTSTATUS ntstatus, int line, const char *file)
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| 59 | {
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| 60 | bool force_nt_status = False;
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| 61 | bool force_dos_status = False;
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| 62 |
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| 63 | if (eclass == (uint8)-1) {
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| 64 | force_nt_status = True;
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| 65 | } else if (NT_STATUS_IS_DOS(ntstatus)) {
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| 66 | force_dos_status = True;
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| 67 | }
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| 68 |
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| 69 | if (force_nt_status || (!force_dos_status && lp_nt_status_support() && (global_client_caps & CAP_STATUS32))) {
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| 70 | /* We're returning an NT error. */
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| 71 | if (NT_STATUS_V(ntstatus) == 0 && eclass) {
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| 72 | ntstatus = dos_to_ntstatus(eclass, ecode);
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| 73 | }
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| 74 | SIVAL(outbuf,smb_rcls,NT_STATUS_V(ntstatus));
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| 75 | SSVAL(outbuf,smb_flg2, SVAL(outbuf,smb_flg2)|FLAGS2_32_BIT_ERROR_CODES);
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| 76 | DEBUG(3,("error packet at %s(%d) cmd=%d (%s) %s\n",
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| 77 | file, line,
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| 78 | (int)CVAL(outbuf,smb_com),
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| 79 | smb_fn_name(CVAL(outbuf,smb_com)),
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| 80 | nt_errstr(ntstatus)));
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| 81 | } else {
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| 82 | /* We're returning a DOS error only. */
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| 83 | if (NT_STATUS_IS_DOS(ntstatus)) {
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| 84 | eclass = NT_STATUS_DOS_CLASS(ntstatus);
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| 85 | ecode = NT_STATUS_DOS_CODE(ntstatus);
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| 86 | } else if (eclass == 0 && NT_STATUS_V(ntstatus)) {
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| 87 | ntstatus_to_dos(ntstatus, &eclass, &ecode);
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| 88 | }
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| 89 |
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| 90 | SSVAL(outbuf,smb_flg2, SVAL(outbuf,smb_flg2)&~FLAGS2_32_BIT_ERROR_CODES);
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| 91 | SSVAL(outbuf,smb_rcls,eclass);
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| 92 | SSVAL(outbuf,smb_err,ecode);
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| 93 |
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| 94 | DEBUG(3,("error packet at %s(%d) cmd=%d (%s) eclass=%d ecode=%d\n",
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| 95 | file, line,
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| 96 | (int)CVAL(outbuf,smb_com),
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| 97 | smb_fn_name(CVAL(outbuf,smb_com)),
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| 98 | eclass,
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| 99 | ecode));
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| 100 | }
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| 101 | }
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| 102 |
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| 103 | int error_packet(char *outbuf, uint8 eclass, uint32 ecode, NTSTATUS ntstatus, int line, const char *file)
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| 104 | {
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| 105 | int outsize = srv_set_message(outbuf,0,0,True);
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| 106 | error_packet_set(outbuf, eclass, ecode, ntstatus, line, file);
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| 107 | return outsize;
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| 108 | }
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| 109 |
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| 110 | void reply_nt_error(struct smb_request *req, NTSTATUS ntstatus,
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| 111 | int line, const char *file)
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| 112 | {
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| 113 | TALLOC_FREE(req->outbuf);
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| 114 | reply_outbuf(req, 0, 0);
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| 115 | error_packet_set((char *)req->outbuf, 0, 0, ntstatus, line, file);
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| 116 | }
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| 117 |
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| 118 | /****************************************************************************
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| 119 | Forces a DOS error on the wire.
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| 120 | ****************************************************************************/
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| 121 |
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| 122 | void reply_force_dos_error(struct smb_request *req, uint8 eclass, uint32 ecode,
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| 123 | int line, const char *file)
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| 124 | {
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| 125 | TALLOC_FREE(req->outbuf);
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| 126 | reply_outbuf(req, 0, 0);
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| 127 | error_packet_set((char *)req->outbuf,
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| 128 | eclass, ecode,
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| 129 | NT_STATUS_DOS(eclass, ecode),
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| 130 | line,
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| 131 | file);
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| 132 | }
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| 133 |
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| 134 | void reply_both_error(struct smb_request *req, uint8 eclass, uint32 ecode,
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| 135 | NTSTATUS status, int line, const char *file)
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| 136 | {
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| 137 | TALLOC_FREE(req->outbuf);
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| 138 | reply_outbuf(req, 0, 0);
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| 139 | error_packet_set((char *)req->outbuf, eclass, ecode, status,
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| 140 | line, file);
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| 141 | }
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| 142 |
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| 143 | void reply_openerror(struct smb_request *req, NTSTATUS status)
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| 144 | {
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| 145 | if (NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_COLLISION)) {
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| 146 | /*
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| 147 | * We hit an existing file, and if we're returning DOS
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| 148 | * error codes OBJECT_NAME_COLLISION would map to
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| 149 | * ERRDOS/183, we need to return ERRDOS/80, see bug
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| 150 | * 4852.
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| 151 | */
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| 152 | reply_botherror(req, NT_STATUS_OBJECT_NAME_COLLISION,
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| 153 | ERRDOS, ERRfilexists);
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| 154 | } else if (NT_STATUS_EQUAL(status, NT_STATUS_TOO_MANY_OPENED_FILES)) {
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| 155 | /* EMFILE always seems to be returned as a DOS error.
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| 156 | * See bug 6837. NOTE this forces a DOS error on the wire
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| 157 | * even though it's calling reply_nterror(). */
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| 158 | reply_force_doserror(req, ERRDOS, ERRnofids);
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| 159 | } else {
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| 160 | reply_nterror(req, status);
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| 161 | }
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| 162 | }
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