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511 lines
15 KiB
511 lines
15 KiB
/*
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* fs/cifs/sess.c
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*
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* SMB/CIFS session setup handling routines
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*
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* Copyright (c) International Business Machines Corp., 2006
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* Author(s): Steve French (sfrench@us.ibm.com)
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*
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* This library is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published
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* by the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This library 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
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* the GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "cifspdu.h"
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#include "cifsglob.h"
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#include "cifsproto.h"
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#include "cifs_unicode.h"
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#include "cifs_debug.h"
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#include "ntlmssp.h"
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#include "nterr.h"
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#include <linux/ctype.h>
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extern void SMBencrypt(unsigned char *passwd, unsigned char *c8,
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unsigned char *p24);
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extern void SMBNTencrypt(unsigned char *passwd, unsigned char *c8,
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unsigned char *p24);
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#ifdef CONFIG_CIFS_EXPERIMENTAL
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static __u32 cifs_ssetup_hdr(struct cifsSesInfo *ses, SESSION_SETUP_ANDX *pSMB)
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{
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__u32 capabilities = 0;
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/* init fields common to all four types of SessSetup */
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/* note that header is initialized to zero in header_assemble */
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pSMB->req.AndXCommand = 0xFF;
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pSMB->req.MaxBufferSize = cpu_to_le16(ses->server->maxBuf);
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pSMB->req.MaxMpxCount = cpu_to_le16(ses->server->maxReq);
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/* Now no need to set SMBFLG_CASELESS or obsolete CANONICAL PATH */
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/* BB verify whether signing required on neg or just on auth frame
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(and NTLM case) */
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capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS |
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CAP_LARGE_WRITE_X | CAP_LARGE_READ_X;
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if(ses->server->secMode & (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED))
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pSMB->req.hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
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if (ses->capabilities & CAP_UNICODE) {
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pSMB->req.hdr.Flags2 |= SMBFLG2_UNICODE;
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capabilities |= CAP_UNICODE;
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}
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if (ses->capabilities & CAP_STATUS32) {
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pSMB->req.hdr.Flags2 |= SMBFLG2_ERR_STATUS;
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capabilities |= CAP_STATUS32;
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}
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if (ses->capabilities & CAP_DFS) {
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pSMB->req.hdr.Flags2 |= SMBFLG2_DFS;
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capabilities |= CAP_DFS;
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}
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if (ses->capabilities & CAP_UNIX) {
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capabilities |= CAP_UNIX;
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}
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/* BB check whether to init vcnum BB */
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return capabilities;
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}
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void unicode_ssetup_strings(char ** pbcc_area, struct cifsSesInfo *ses,
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const struct nls_table * nls_cp)
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{
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char * bcc_ptr = *pbcc_area;
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int bytes_ret = 0;
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/* BB FIXME add check that strings total less
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than 335 or will need to send them as arrays */
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/* align unicode strings, must be word aligned */
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if ((long) bcc_ptr % 2) {
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*bcc_ptr = 0;
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bcc_ptr++;
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}
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/* copy user */
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if(ses->userName == NULL) {
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/* BB what about null user mounts - check that we do this BB */
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} else { /* 300 should be long enough for any conceivable user name */
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bytes_ret = cifs_strtoUCS((__le16 *) bcc_ptr, ses->userName,
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300, nls_cp);
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}
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bcc_ptr += 2 * bytes_ret;
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bcc_ptr += 2; /* account for null termination */
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/* copy domain */
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if(ses->domainName == NULL)
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bytes_ret = cifs_strtoUCS((__le16 *) bcc_ptr,
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"CIFS_LINUX_DOM", 32, nls_cp);
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else
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bytes_ret = cifs_strtoUCS((__le16 *) bcc_ptr, ses->domainName,
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256, nls_cp);
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bcc_ptr += 2 * bytes_ret;
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bcc_ptr += 2; /* account for null terminator */
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/* Copy OS version */
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bytes_ret = cifs_strtoUCS((__le16 *)bcc_ptr, "Linux version ", 32,
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nls_cp);
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bcc_ptr += 2 * bytes_ret;
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bytes_ret = cifs_strtoUCS((__le16 *) bcc_ptr, system_utsname.release,
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32, nls_cp);
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bcc_ptr += 2 * bytes_ret;
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bcc_ptr += 2; /* trailing null */
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bytes_ret = cifs_strtoUCS((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS,
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32, nls_cp);
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bcc_ptr += 2 * bytes_ret;
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bcc_ptr += 2; /* trailing null */
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*pbcc_area = bcc_ptr;
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}
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void ascii_ssetup_strings(char ** pbcc_area, struct cifsSesInfo *ses,
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const struct nls_table * nls_cp)
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{
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char * bcc_ptr = *pbcc_area;
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/* copy user */
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/* BB what about null user mounts - check that we do this BB */
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/* copy user */
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if(ses->userName == NULL) {
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/* BB what about null user mounts - check that we do this BB */
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} else { /* 300 should be long enough for any conceivable user name */
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strncpy(bcc_ptr, ses->userName, 300);
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}
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/* BB improve check for overflow */
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bcc_ptr += strnlen(ses->userName, 200);
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*bcc_ptr = 0;
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bcc_ptr++; /* account for null termination */
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/* copy domain */
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if(ses->domainName == NULL) {
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strcpy(bcc_ptr, "CIFS_LINUX_DOM");
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bcc_ptr += 14; /* strlen(CIFS_LINUX_DOM) */
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} else {
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strncpy(bcc_ptr, ses->domainName, 256);
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bcc_ptr += strnlen(ses->domainName, 256);
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}
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*bcc_ptr = 0;
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bcc_ptr++;
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/* BB check for overflow here */
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strcpy(bcc_ptr, "Linux version ");
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bcc_ptr += strlen("Linux version ");
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strcpy(bcc_ptr, system_utsname.release);
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bcc_ptr += strlen(system_utsname.release) + 1;
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strcpy(bcc_ptr, CIFS_NETWORK_OPSYS);
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bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1;
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*pbcc_area = bcc_ptr;
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}
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int decode_unicode_ssetup(char ** pbcc_area, int bleft, struct cifsSesInfo *ses,
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const struct nls_table * nls_cp)
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{
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int rc = 0;
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int words_left, len;
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char * data = *pbcc_area;
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cFYI(1,("bleft %d",bleft));
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/* word align, if bytes remaining is not even */
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if(bleft % 2) {
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bleft--;
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data++;
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}
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words_left = bleft / 2;
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/* save off server operating system */
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len = UniStrnlen((wchar_t *) data, words_left);
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/* We look for obvious messed up bcc or strings in response so we do not go off
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the end since (at least) WIN2K and Windows XP have a major bug in not null
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terminating last Unicode string in response */
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if(len >= words_left)
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return rc;
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if(ses->serverOS)
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kfree(ses->serverOS);
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/* UTF-8 string will not grow more than four times as big as UCS-16 */
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ses->serverOS = kzalloc(4 * len, GFP_KERNEL);
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if(ses->serverOS != NULL) {
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cifs_strfromUCS_le(ses->serverOS, (__le16 *)data, len,
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nls_cp);
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}
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data += 2 * (len + 1);
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words_left -= len + 1;
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/* save off server network operating system */
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len = UniStrnlen((wchar_t *) data, words_left);
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if(len >= words_left)
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return rc;
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if(ses->serverNOS)
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kfree(ses->serverNOS);
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ses->serverNOS = kzalloc(4 * len, GFP_KERNEL); /* BB this is wrong length FIXME BB */
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if(ses->serverNOS != NULL) {
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cifs_strfromUCS_le(ses->serverNOS, (__le16 *)data, len,
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nls_cp);
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if(strncmp(ses->serverNOS, "NT LAN Manager 4",16) == 0) {
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cFYI(1,("NT4 server"));
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ses->flags |= CIFS_SES_NT4;
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}
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}
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data += 2 * (len + 1);
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words_left -= len + 1;
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/* save off server domain */
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len = UniStrnlen((wchar_t *) data, words_left);
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if(len > words_left)
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return rc;
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if(ses->serverDomain)
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kfree(ses->serverDomain);
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ses->serverDomain = kzalloc(2 * (len + 1), GFP_KERNEL); /* BB FIXME wrong length */
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if(ses->serverDomain != NULL) {
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cifs_strfromUCS_le(ses->serverDomain, (__le16 *)data, len,
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nls_cp);
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ses->serverDomain[2*len] = 0;
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ses->serverDomain[(2*len) + 1] = 0;
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}
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data += 2 * (len + 1);
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words_left -= len + 1;
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cFYI(1,("words left: %d",words_left));
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return rc;
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}
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int decode_ascii_ssetup(char ** pbcc_area, int bleft, struct cifsSesInfo *ses,
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const struct nls_table * nls_cp)
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{
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int rc = 0;
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int len;
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char * bcc_ptr = *pbcc_area;
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cFYI(1,("decode sessetup ascii. bleft %d", bleft));
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len = strnlen(bcc_ptr, bleft);
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if(len >= bleft)
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return rc;
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if(ses->serverOS)
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kfree(ses->serverOS);
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ses->serverOS = kzalloc(len + 1, GFP_KERNEL);
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if(ses->serverOS)
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strncpy(ses->serverOS, bcc_ptr, len);
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bcc_ptr += len + 1;
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bleft -= len + 1;
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len = strnlen(bcc_ptr, bleft);
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if(len >= bleft)
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return rc;
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if(ses->serverNOS)
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kfree(ses->serverNOS);
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ses->serverNOS = kzalloc(len + 1, GFP_KERNEL);
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if(ses->serverNOS)
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strncpy(ses->serverNOS, bcc_ptr, len);
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bcc_ptr += len + 1;
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bleft -= len + 1;
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len = strnlen(bcc_ptr, bleft);
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if(len > bleft)
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return rc;
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if(ses->serverDomain)
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kfree(ses->serverDomain);
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ses->serverDomain = kzalloc(len + 1, GFP_KERNEL);
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if(ses->serverOS)
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strncpy(ses->serverOS, bcc_ptr, len);
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bcc_ptr += len + 1;
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bleft -= len + 1;
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cFYI(1,("ascii: bytes left %d",bleft));
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return rc;
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}
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int
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CIFS_SessSetup(unsigned int xid, struct cifsSesInfo *ses, int first_time,
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const struct nls_table *nls_cp)
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{
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int rc = 0;
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int wct;
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int i;
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struct smb_hdr *smb_buf;
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char *bcc_ptr;
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SESSION_SETUP_ANDX *pSMB;
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__u32 capabilities;
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int count;
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int resp_buf_type = 0;
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struct kvec iov[1];
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enum securityEnum type;
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__u16 action;
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int bytes_remaining;
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if(ses == NULL)
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return -EINVAL;
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type = ses->server->secType;
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if(type == LANMAN) {
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#ifndef CONFIG_CIFS_WEAK_PW_HASH
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/* LANMAN and plaintext are less secure and off by default.
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So we make this explicitly be turned on in kconfig (in the
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build) and turned on at runtime (changed from the default)
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in proc/fs/cifs or via mount parm. Unfortunately this is
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needed for old Win (e.g. Win95), some obscure NAS and OS/2 */
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return -EOPNOTSUPP;
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#endif
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wct = 10; /* lanman 2 style sessionsetup */
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} else if(type == NTLM) /* NTLMv2 may retry NTLM */
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wct = 13; /* old style NTLM sessionsetup */
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else /* same size for negotiate or auth, NTLMSSP or extended security */
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wct = 12;
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rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses,
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(void **)&smb_buf);
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if(rc)
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return rc;
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pSMB = (SESSION_SETUP_ANDX *)smb_buf;
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capabilities = cifs_ssetup_hdr(ses, pSMB);
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bcc_ptr = pByteArea(smb_buf);
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if(type == LANMAN) {
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#ifdef CONFIG_CIFS_WEAK_PW_HASH
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char lnm_session_key[CIFS_SESSION_KEY_SIZE];
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char password_with_pad[CIFS_ENCPWD_SIZE];
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/* no capabilities flags in old lanman negotiation */
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pSMB->old_req.PasswordLength = CIFS_SESSION_KEY_SIZE;
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/* BB calculate hash with password */
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/* and copy into bcc */
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memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
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strncpy(password_with_pad, ses->password, CIFS_ENCPWD_SIZE);
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/* calculate old style session key */
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/* toupper may be less broken then repeatedly calling
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nls_toupper would be, but neither handles multibyte code pages
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but the only alternative would be converting to UCS-16 (Unicode)
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uppercasing and converting back which is only worth doing if
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we knew it were utf8. utf8 code page needs its own
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toupper and tolower and strnicmp functions */
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for(i = 0; i< CIFS_ENCPWD_SIZE; i++) {
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password_with_pad[i] = toupper(password_with_pad[i]);
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}
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SMBencrypt(password_with_pad, ses->server->cryptKey,
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lnm_session_key);
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#ifdef CONFIG_CIFS_DEBUG2
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cifs_dump_mem("cryptkey: ",ses->server->cryptKey,
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CIFS_SESSION_KEY_SIZE);
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#endif
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/* clear password before we return/free memory */
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memset(password_with_pad, 0, CIFS_ENCPWD_SIZE);
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memcpy(bcc_ptr, (char *)lnm_session_key, CIFS_SESSION_KEY_SIZE);
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bcc_ptr += CIFS_SESSION_KEY_SIZE;
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/* can not sign if LANMAN negotiated so no need
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to calculate signing key? but what if server
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changed to do higher than lanman dialect and
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we reconnected would we ever calc signing_key? */
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cERROR(1,("Negotiating LANMAN setting up strings"));
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/* Unicode not allowed for LANMAN dialects */
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ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
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#endif
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} else if (type == NTLM) {
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char ntlm_session_key[CIFS_SESSION_KEY_SIZE];
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pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
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pSMB->req_no_secext.CaseInsensitivePasswordLength =
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cpu_to_le16(CIFS_SESSION_KEY_SIZE);
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pSMB->req_no_secext.CaseSensitivePasswordLength =
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cpu_to_le16(CIFS_SESSION_KEY_SIZE);
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/* calculate session key */
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SMBNTencrypt(ses->password, ses->server->cryptKey,
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ntlm_session_key);
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if(first_time) /* should this be moved into common code
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with similar ntlmv2 path? */
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cifs_calculate_mac_key(
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ses->server->mac_signing_key,
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ntlm_session_key, ses->password);
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/* copy session key */
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memcpy(bcc_ptr, (char *)ntlm_session_key,CIFS_SESSION_KEY_SIZE);
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bcc_ptr += CIFS_SESSION_KEY_SIZE;
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memcpy(bcc_ptr, (char *)ntlm_session_key,CIFS_SESSION_KEY_SIZE);
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bcc_ptr += CIFS_SESSION_KEY_SIZE;
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if(ses->capabilities & CAP_UNICODE)
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unicode_ssetup_strings(&bcc_ptr, ses, nls_cp);
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else
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ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
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} else /* NTLMSSP or SPNEGO */ {
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pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
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capabilities |= CAP_EXTENDED_SECURITY;
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pSMB->req.Capabilities = cpu_to_le32(capabilities);
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/* BB set password lengths */
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}
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count = (long) bcc_ptr - (long) pByteArea(smb_buf);
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smb_buf->smb_buf_length += count;
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/* if we switch to small buffers, count will need to be fewer
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than 383 (strings less than 335 bytes) */
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BCC_LE(smb_buf) = cpu_to_le16(count);
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/* BB FIXME check for other non ntlm code paths */
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/* BB check is this too big for a small smb? */
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iov[0].iov_base = (char *)pSMB;
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iov[0].iov_len = smb_buf->smb_buf_length + 4;
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rc = SendReceive2(xid, ses, iov, 1 /* num_iovecs */, &resp_buf_type, 0);
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/* SMB request buf freed in SendReceive2 */
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cFYI(1,("ssetup rc from sendrecv2 is %d",rc));
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if(rc)
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goto ssetup_exit;
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pSMB = (SESSION_SETUP_ANDX *)iov[0].iov_base;
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smb_buf = (struct smb_hdr *)iov[0].iov_base;
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if((smb_buf->WordCount != 3) && (smb_buf->WordCount != 4)) {
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rc = -EIO;
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cERROR(1,("bad word count %d", smb_buf->WordCount));
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goto ssetup_exit;
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}
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action = le16_to_cpu(pSMB->resp.Action);
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if (action & GUEST_LOGIN)
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cFYI(1, (" Guest login")); /* BB mark SesInfo struct? */
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ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
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cFYI(1, ("UID = %d ", ses->Suid));
|
|
/* response can have either 3 or 4 word count - Samba sends 3 */
|
|
/* and lanman response is 3 */
|
|
bytes_remaining = BCC(smb_buf);
|
|
bcc_ptr = pByteArea(smb_buf);
|
|
|
|
if(smb_buf->WordCount == 4) {
|
|
__u16 blob_len;
|
|
blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
|
|
bcc_ptr += blob_len;
|
|
if(blob_len > bytes_remaining) {
|
|
cERROR(1,("bad security blob length %d", blob_len));
|
|
rc = -EINVAL;
|
|
goto ssetup_exit;
|
|
}
|
|
bytes_remaining -= blob_len;
|
|
}
|
|
|
|
/* BB check if Unicode and decode strings */
|
|
if(smb_buf->Flags2 & SMBFLG2_UNICODE)
|
|
rc = decode_unicode_ssetup(&bcc_ptr, bytes_remaining,
|
|
ses, nls_cp);
|
|
else
|
|
rc = decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,nls_cp);
|
|
|
|
ssetup_exit:
|
|
if(resp_buf_type == CIFS_SMALL_BUFFER) {
|
|
cFYI(1,("ssetup freeing small buf %p", iov[0].iov_base));
|
|
cifs_small_buf_release(iov[0].iov_base);
|
|
} else if(resp_buf_type == CIFS_LARGE_BUFFER)
|
|
cifs_buf_release(iov[0].iov_base);
|
|
|
|
return rc;
|
|
}
|
|
#endif /* CONFIG_CIFS_EXPERIMENTAL */
|
|
|