![Shirish Pargaonkar](/assets/img/avatar_default.png)
For null user mounts, do not invoke string length function during session setup. Cc: <stable@kernel.org Reported-and-Tested-by: Chris Clayton <chris2553@googlemail.com> Acked-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Shirish Pargaonkar <shirishpargaonkar@gmail.com> Signed-off-by: Steve French <smfrench@gmail.com>
959 lines
29 KiB
C
959 lines
29 KiB
C
/*
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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, 2009
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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/utsname.h>
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#include <linux/slab.h>
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#include "cifs_spnego.h"
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/*
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* Checks if this is the first smb session to be reconnected after
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* the socket has been reestablished (so we know whether to use vc 0).
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* Called while holding the cifs_tcp_ses_lock, so do not block
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*/
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static bool is_first_ses_reconnect(struct cifs_ses *ses)
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{
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struct list_head *tmp;
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struct cifs_ses *tmp_ses;
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list_for_each(tmp, &ses->server->smb_ses_list) {
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tmp_ses = list_entry(tmp, struct cifs_ses,
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smb_ses_list);
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if (tmp_ses->need_reconnect == false)
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return false;
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}
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/* could not find a session that was already connected,
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this must be the first one we are reconnecting */
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return true;
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}
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/*
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* vc number 0 is treated specially by some servers, and should be the
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* first one we request. After that we can use vcnumbers up to maxvcs,
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* one for each smb session (some Windows versions set maxvcs incorrectly
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* so maxvc=1 can be ignored). If we have too many vcs, we can reuse
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* any vc but zero (some servers reset the connection on vcnum zero)
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*
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*/
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static __le16 get_next_vcnum(struct cifs_ses *ses)
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{
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__u16 vcnum = 0;
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struct list_head *tmp;
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struct cifs_ses *tmp_ses;
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__u16 max_vcs = ses->server->max_vcs;
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__u16 i;
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int free_vc_found = 0;
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/* Quoting the MS-SMB specification: "Windows-based SMB servers set this
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field to one but do not enforce this limit, which allows an SMB client
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to establish more virtual circuits than allowed by this value ... but
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other server implementations can enforce this limit." */
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if (max_vcs < 2)
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max_vcs = 0xFFFF;
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spin_lock(&cifs_tcp_ses_lock);
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if ((ses->need_reconnect) && is_first_ses_reconnect(ses))
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goto get_vc_num_exit; /* vcnum will be zero */
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for (i = ses->server->srv_count - 1; i < max_vcs; i++) {
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if (i == 0) /* this is the only connection, use vc 0 */
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break;
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free_vc_found = 1;
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list_for_each(tmp, &ses->server->smb_ses_list) {
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tmp_ses = list_entry(tmp, struct cifs_ses,
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smb_ses_list);
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if (tmp_ses->vcnum == i) {
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free_vc_found = 0;
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break; /* found duplicate, try next vcnum */
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}
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}
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if (free_vc_found)
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break; /* we found a vcnumber that will work - use it */
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}
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if (i == 0)
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vcnum = 0; /* for most common case, ie if one smb session, use
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vc zero. Also for case when no free vcnum, zero
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is safest to send (some clients only send zero) */
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else if (free_vc_found == 0)
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vcnum = 1; /* we can not reuse vc=0 safely, since some servers
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reset all uids on that, but 1 is ok. */
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else
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vcnum = i;
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ses->vcnum = vcnum;
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get_vc_num_exit:
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spin_unlock(&cifs_tcp_ses_lock);
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return cpu_to_le16(vcnum);
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}
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static __u32 cifs_ssetup_hdr(struct cifs_ses *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 offsets for first seven fields in req struct are same */
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/* in CIFS Specs so does not matter which of 3 forms of struct */
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/* that we use in next few lines */
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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(min_t(u32,
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CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4,
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USHRT_MAX));
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pSMB->req.MaxMpxCount = cpu_to_le16(ses->server->maxReq);
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pSMB->req.VcNumber = get_next_vcnum(ses);
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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->sec_mode &
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(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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return capabilities;
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}
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static void
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unicode_oslm_strings(char **pbcc_area, 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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/* Copy OS version */
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bytes_ret = cifs_strtoUTF16((__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_strtoUTF16((__le16 *) bcc_ptr, init_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_strtoUTF16((__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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static void unicode_domain_string(char **pbcc_area, struct cifs_ses *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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/* copy domain */
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if (ses->domainName == NULL) {
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/* Sending null domain better than using a bogus domain name (as
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we did briefly in 2.6.18) since server will use its default */
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*bcc_ptr = 0;
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*(bcc_ptr+1) = 0;
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bytes_ret = 0;
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} else
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bytes_ret = cifs_strtoUTF16((__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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*pbcc_area = bcc_ptr;
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}
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static void unicode_ssetup_strings(char **pbcc_area, struct cifs_ses *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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/* unicode strings, must be word aligned before the call */
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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->user_name == NULL) {
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/* null user mount */
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*bcc_ptr = 0;
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*(bcc_ptr+1) = 0;
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} else {
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bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->user_name,
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MAX_USERNAME_SIZE, 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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unicode_domain_string(&bcc_ptr, ses, nls_cp);
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unicode_oslm_strings(&bcc_ptr, nls_cp);
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*pbcc_area = bcc_ptr;
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}
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static void ascii_ssetup_strings(char **pbcc_area, struct cifs_ses *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->user_name != NULL) {
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strncpy(bcc_ptr, ses->user_name, MAX_USERNAME_SIZE);
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bcc_ptr += strnlen(ses->user_name, MAX_USERNAME_SIZE);
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}
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/* else null user mount */
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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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strncpy(bcc_ptr, ses->domainName, 256);
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bcc_ptr += strnlen(ses->domainName, 256);
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} /* else we will send a null domain name
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so the server will default to its own domain */
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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, init_utsname()->release);
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bcc_ptr += strlen(init_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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static void
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decode_unicode_ssetup(char **pbcc_area, int bleft, struct cifs_ses *ses,
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const struct nls_table *nls_cp)
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{
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int len;
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char *data = *pbcc_area;
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cFYI(1, "bleft %d", bleft);
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kfree(ses->serverOS);
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ses->serverOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
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cFYI(1, "serverOS=%s", ses->serverOS);
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len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
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data += len;
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bleft -= len;
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if (bleft <= 0)
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return;
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kfree(ses->serverNOS);
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ses->serverNOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
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cFYI(1, "serverNOS=%s", ses->serverNOS);
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len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
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data += len;
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bleft -= len;
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if (bleft <= 0)
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return;
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kfree(ses->serverDomain);
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ses->serverDomain = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
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cFYI(1, "serverDomain=%s", ses->serverDomain);
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return;
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}
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static int decode_ascii_ssetup(char **pbcc_area, __u16 bleft,
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struct cifs_ses *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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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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if (strncmp(ses->serverOS, "OS/2", 4) == 0) {
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cFYI(1, "OS/2 server");
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ses->flags |= CIFS_SES_OS2;
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}
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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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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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/* No domain field in LANMAN case. Domain is
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returned by old servers in the SMB negprot response */
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/* BB For newer servers which do not support Unicode,
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but thus do return domain here we could add parsing
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for it later, but it is not very important */
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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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static int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len,
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struct cifs_ses *ses)
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{
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unsigned int tioffset; /* challenge message target info area */
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unsigned int tilen; /* challenge message target info area length */
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CHALLENGE_MESSAGE *pblob = (CHALLENGE_MESSAGE *)bcc_ptr;
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if (blob_len < sizeof(CHALLENGE_MESSAGE)) {
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cERROR(1, "challenge blob len %d too small", blob_len);
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return -EINVAL;
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}
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if (memcmp(pblob->Signature, "NTLMSSP", 8)) {
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cERROR(1, "blob signature incorrect %s", pblob->Signature);
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return -EINVAL;
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}
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if (pblob->MessageType != NtLmChallenge) {
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cERROR(1, "Incorrect message type %d", pblob->MessageType);
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return -EINVAL;
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}
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memcpy(ses->ntlmssp->cryptkey, pblob->Challenge, CIFS_CRYPTO_KEY_SIZE);
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/* BB we could decode pblob->NegotiateFlags; some may be useful */
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/* In particular we can examine sign flags */
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/* BB spec says that if AvId field of MsvAvTimestamp is populated then
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we must set the MIC field of the AUTHENTICATE_MESSAGE */
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ses->ntlmssp->server_flags = le32_to_cpu(pblob->NegotiateFlags);
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tioffset = le32_to_cpu(pblob->TargetInfoArray.BufferOffset);
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tilen = le16_to_cpu(pblob->TargetInfoArray.Length);
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if (tioffset > blob_len || tioffset + tilen > blob_len) {
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cERROR(1, "tioffset + tilen too high %u + %u", tioffset, tilen);
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return -EINVAL;
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}
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if (tilen) {
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ses->auth_key.response = kmalloc(tilen, GFP_KERNEL);
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if (!ses->auth_key.response) {
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cERROR(1, "Challenge target info allocation failure");
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return -ENOMEM;
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}
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memcpy(ses->auth_key.response, bcc_ptr + tioffset, tilen);
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ses->auth_key.len = tilen;
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}
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return 0;
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}
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/* BB Move to ntlmssp.c eventually */
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/* We do not malloc the blob, it is passed in pbuffer, because
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it is fixed size, and small, making this approach cleaner */
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static void build_ntlmssp_negotiate_blob(unsigned char *pbuffer,
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struct cifs_ses *ses)
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{
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NEGOTIATE_MESSAGE *sec_blob = (NEGOTIATE_MESSAGE *)pbuffer;
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__u32 flags;
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memset(pbuffer, 0, sizeof(NEGOTIATE_MESSAGE));
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memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
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sec_blob->MessageType = NtLmNegotiate;
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/* BB is NTLMV2 session security format easier to use here? */
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flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET |
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NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
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NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC;
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if (ses->server->sec_mode &
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(SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) {
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flags |= NTLMSSP_NEGOTIATE_SIGN;
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if (!ses->server->session_estab)
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flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
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}
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sec_blob->NegotiateFlags = cpu_to_le32(flags);
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sec_blob->WorkstationName.BufferOffset = 0;
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sec_blob->WorkstationName.Length = 0;
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sec_blob->WorkstationName.MaximumLength = 0;
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/* Domain name is sent on the Challenge not Negotiate NTLMSSP request */
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sec_blob->DomainName.BufferOffset = 0;
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sec_blob->DomainName.Length = 0;
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sec_blob->DomainName.MaximumLength = 0;
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}
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/* We do not malloc the blob, it is passed in pbuffer, because its
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maximum possible size is fixed and small, making this approach cleaner.
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This function returns the length of the data in the blob */
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static int build_ntlmssp_auth_blob(unsigned char *pbuffer,
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u16 *buflen,
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struct cifs_ses *ses,
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const struct nls_table *nls_cp)
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{
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int rc;
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AUTHENTICATE_MESSAGE *sec_blob = (AUTHENTICATE_MESSAGE *)pbuffer;
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__u32 flags;
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unsigned char *tmp;
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|
memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
|
|
sec_blob->MessageType = NtLmAuthenticate;
|
|
|
|
flags = NTLMSSP_NEGOTIATE_56 |
|
|
NTLMSSP_REQUEST_TARGET | NTLMSSP_NEGOTIATE_TARGET_INFO |
|
|
NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
|
|
NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC;
|
|
if (ses->server->sec_mode &
|
|
(SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) {
|
|
flags |= NTLMSSP_NEGOTIATE_SIGN;
|
|
if (!ses->server->session_estab)
|
|
flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
|
|
}
|
|
|
|
tmp = pbuffer + sizeof(AUTHENTICATE_MESSAGE);
|
|
sec_blob->NegotiateFlags = cpu_to_le32(flags);
|
|
|
|
sec_blob->LmChallengeResponse.BufferOffset =
|
|
cpu_to_le32(sizeof(AUTHENTICATE_MESSAGE));
|
|
sec_blob->LmChallengeResponse.Length = 0;
|
|
sec_blob->LmChallengeResponse.MaximumLength = 0;
|
|
|
|
sec_blob->NtChallengeResponse.BufferOffset = cpu_to_le32(tmp - pbuffer);
|
|
rc = setup_ntlmv2_rsp(ses, nls_cp);
|
|
if (rc) {
|
|
cERROR(1, "Error %d during NTLMSSP authentication", rc);
|
|
goto setup_ntlmv2_ret;
|
|
}
|
|
memcpy(tmp, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
|
|
ses->auth_key.len - CIFS_SESS_KEY_SIZE);
|
|
tmp += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
|
|
|
|
sec_blob->NtChallengeResponse.Length =
|
|
cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
|
|
sec_blob->NtChallengeResponse.MaximumLength =
|
|
cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
|
|
|
|
if (ses->domainName == NULL) {
|
|
sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - pbuffer);
|
|
sec_blob->DomainName.Length = 0;
|
|
sec_blob->DomainName.MaximumLength = 0;
|
|
tmp += 2;
|
|
} else {
|
|
int len;
|
|
len = cifs_strtoUTF16((__le16 *)tmp, ses->domainName,
|
|
MAX_USERNAME_SIZE, nls_cp);
|
|
len *= 2; /* unicode is 2 bytes each */
|
|
sec_blob->DomainName.BufferOffset = cpu_to_le32(tmp - pbuffer);
|
|
sec_blob->DomainName.Length = cpu_to_le16(len);
|
|
sec_blob->DomainName.MaximumLength = cpu_to_le16(len);
|
|
tmp += len;
|
|
}
|
|
|
|
if (ses->user_name == NULL) {
|
|
sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - pbuffer);
|
|
sec_blob->UserName.Length = 0;
|
|
sec_blob->UserName.MaximumLength = 0;
|
|
tmp += 2;
|
|
} else {
|
|
int len;
|
|
len = cifs_strtoUTF16((__le16 *)tmp, ses->user_name,
|
|
MAX_USERNAME_SIZE, nls_cp);
|
|
len *= 2; /* unicode is 2 bytes each */
|
|
sec_blob->UserName.BufferOffset = cpu_to_le32(tmp - pbuffer);
|
|
sec_blob->UserName.Length = cpu_to_le16(len);
|
|
sec_blob->UserName.MaximumLength = cpu_to_le16(len);
|
|
tmp += len;
|
|
}
|
|
|
|
sec_blob->WorkstationName.BufferOffset = cpu_to_le32(tmp - pbuffer);
|
|
sec_blob->WorkstationName.Length = 0;
|
|
sec_blob->WorkstationName.MaximumLength = 0;
|
|
tmp += 2;
|
|
|
|
if (((ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_KEY_XCH) ||
|
|
(ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_EXTENDED_SEC))
|
|
&& !calc_seckey(ses)) {
|
|
memcpy(tmp, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);
|
|
sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - pbuffer);
|
|
sec_blob->SessionKey.Length = cpu_to_le16(CIFS_CPHTXT_SIZE);
|
|
sec_blob->SessionKey.MaximumLength =
|
|
cpu_to_le16(CIFS_CPHTXT_SIZE);
|
|
tmp += CIFS_CPHTXT_SIZE;
|
|
} else {
|
|
sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - pbuffer);
|
|
sec_blob->SessionKey.Length = 0;
|
|
sec_blob->SessionKey.MaximumLength = 0;
|
|
}
|
|
|
|
setup_ntlmv2_ret:
|
|
*buflen = tmp - pbuffer;
|
|
return rc;
|
|
}
|
|
|
|
int
|
|
CIFS_SessSetup(unsigned int xid, struct cifs_ses *ses,
|
|
const struct nls_table *nls_cp)
|
|
{
|
|
int rc = 0;
|
|
int wct;
|
|
struct smb_hdr *smb_buf;
|
|
char *bcc_ptr;
|
|
char *str_area;
|
|
SESSION_SETUP_ANDX *pSMB;
|
|
__u32 capabilities;
|
|
__u16 count;
|
|
int resp_buf_type;
|
|
struct kvec iov[3];
|
|
enum securityEnum type;
|
|
__u16 action, bytes_remaining;
|
|
struct key *spnego_key = NULL;
|
|
__le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */
|
|
u16 blob_len;
|
|
char *ntlmsspblob = NULL;
|
|
|
|
if (ses == NULL)
|
|
return -EINVAL;
|
|
|
|
type = ses->server->secType;
|
|
cFYI(1, "sess setup type %d", type);
|
|
if (type == RawNTLMSSP) {
|
|
/* if memory allocation is successful, caller of this function
|
|
* frees it.
|
|
*/
|
|
ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
|
|
if (!ses->ntlmssp)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
ssetup_ntlmssp_authenticate:
|
|
if (phase == NtLmChallenge)
|
|
phase = NtLmAuthenticate; /* if ntlmssp, now final phase */
|
|
|
|
if (type == LANMAN) {
|
|
#ifndef CONFIG_CIFS_WEAK_PW_HASH
|
|
/* LANMAN and plaintext are less secure and off by default.
|
|
So we make this explicitly be turned on in kconfig (in the
|
|
build) and turned on at runtime (changed from the default)
|
|
in proc/fs/cifs or via mount parm. Unfortunately this is
|
|
needed for old Win (e.g. Win95), some obscure NAS and OS/2 */
|
|
return -EOPNOTSUPP;
|
|
#endif
|
|
wct = 10; /* lanman 2 style sessionsetup */
|
|
} else if ((type == NTLM) || (type == NTLMv2)) {
|
|
/* For NTLMv2 failures eventually may need to retry NTLM */
|
|
wct = 13; /* old style NTLM sessionsetup */
|
|
} else /* same size: negotiate or auth, NTLMSSP or extended security */
|
|
wct = 12;
|
|
|
|
rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses,
|
|
(void **)&smb_buf);
|
|
if (rc)
|
|
return rc;
|
|
|
|
pSMB = (SESSION_SETUP_ANDX *)smb_buf;
|
|
|
|
capabilities = cifs_ssetup_hdr(ses, pSMB);
|
|
|
|
/* we will send the SMB in three pieces:
|
|
a fixed length beginning part, an optional
|
|
SPNEGO blob (which can be zero length), and a
|
|
last part which will include the strings
|
|
and rest of bcc area. This allows us to avoid
|
|
a large buffer 17K allocation */
|
|
iov[0].iov_base = (char *)pSMB;
|
|
iov[0].iov_len = be32_to_cpu(smb_buf->smb_buf_length) + 4;
|
|
|
|
/* setting this here allows the code at the end of the function
|
|
to free the request buffer if there's an error */
|
|
resp_buf_type = CIFS_SMALL_BUFFER;
|
|
|
|
/* 2000 big enough to fit max user, domain, NOS name etc. */
|
|
str_area = kmalloc(2000, GFP_KERNEL);
|
|
if (str_area == NULL) {
|
|
rc = -ENOMEM;
|
|
goto ssetup_exit;
|
|
}
|
|
bcc_ptr = str_area;
|
|
|
|
ses->flags &= ~CIFS_SES_LANMAN;
|
|
|
|
iov[1].iov_base = NULL;
|
|
iov[1].iov_len = 0;
|
|
|
|
if (type == LANMAN) {
|
|
#ifdef CONFIG_CIFS_WEAK_PW_HASH
|
|
char lnm_session_key[CIFS_AUTH_RESP_SIZE];
|
|
|
|
pSMB->req.hdr.Flags2 &= ~SMBFLG2_UNICODE;
|
|
|
|
/* no capabilities flags in old lanman negotiation */
|
|
|
|
pSMB->old_req.PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE);
|
|
|
|
/* Calculate hash with password and copy into bcc_ptr.
|
|
* Encryption Key (stored as in cryptkey) gets used if the
|
|
* security mode bit in Negottiate Protocol response states
|
|
* to use challenge/response method (i.e. Password bit is 1).
|
|
*/
|
|
|
|
rc = calc_lanman_hash(ses->password, ses->server->cryptkey,
|
|
ses->server->sec_mode & SECMODE_PW_ENCRYPT ?
|
|
true : false, lnm_session_key);
|
|
|
|
ses->flags |= CIFS_SES_LANMAN;
|
|
memcpy(bcc_ptr, (char *)lnm_session_key, CIFS_AUTH_RESP_SIZE);
|
|
bcc_ptr += CIFS_AUTH_RESP_SIZE;
|
|
|
|
/* can not sign if LANMAN negotiated so no need
|
|
to calculate signing key? but what if server
|
|
changed to do higher than lanman dialect and
|
|
we reconnected would we ever calc signing_key? */
|
|
|
|
cFYI(1, "Negotiating LANMAN setting up strings");
|
|
/* Unicode not allowed for LANMAN dialects */
|
|
ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
|
|
#endif
|
|
} else if (type == NTLM) {
|
|
pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
|
|
pSMB->req_no_secext.CaseInsensitivePasswordLength =
|
|
cpu_to_le16(CIFS_AUTH_RESP_SIZE);
|
|
pSMB->req_no_secext.CaseSensitivePasswordLength =
|
|
cpu_to_le16(CIFS_AUTH_RESP_SIZE);
|
|
|
|
/* calculate ntlm response and session key */
|
|
rc = setup_ntlm_response(ses, nls_cp);
|
|
if (rc) {
|
|
cERROR(1, "Error %d during NTLM authentication", rc);
|
|
goto ssetup_exit;
|
|
}
|
|
|
|
/* copy ntlm response */
|
|
memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
|
|
CIFS_AUTH_RESP_SIZE);
|
|
bcc_ptr += CIFS_AUTH_RESP_SIZE;
|
|
memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
|
|
CIFS_AUTH_RESP_SIZE);
|
|
bcc_ptr += CIFS_AUTH_RESP_SIZE;
|
|
|
|
if (ses->capabilities & CAP_UNICODE) {
|
|
/* unicode strings must be word aligned */
|
|
if (iov[0].iov_len % 2) {
|
|
*bcc_ptr = 0;
|
|
bcc_ptr++;
|
|
}
|
|
unicode_ssetup_strings(&bcc_ptr, ses, nls_cp);
|
|
} else
|
|
ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
|
|
} else if (type == NTLMv2) {
|
|
pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
|
|
|
|
/* LM2 password would be here if we supported it */
|
|
pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
|
|
|
|
/* calculate nlmv2 response and session key */
|
|
rc = setup_ntlmv2_rsp(ses, nls_cp);
|
|
if (rc) {
|
|
cERROR(1, "Error %d during NTLMv2 authentication", rc);
|
|
goto ssetup_exit;
|
|
}
|
|
memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,
|
|
ses->auth_key.len - CIFS_SESS_KEY_SIZE);
|
|
bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE;
|
|
|
|
/* set case sensitive password length after tilen may get
|
|
* assigned, tilen is 0 otherwise.
|
|
*/
|
|
pSMB->req_no_secext.CaseSensitivePasswordLength =
|
|
cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);
|
|
|
|
if (ses->capabilities & CAP_UNICODE) {
|
|
if (iov[0].iov_len % 2) {
|
|
*bcc_ptr = 0;
|
|
bcc_ptr++;
|
|
}
|
|
unicode_ssetup_strings(&bcc_ptr, ses, nls_cp);
|
|
} else
|
|
ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
|
|
} else if (type == Kerberos) {
|
|
#ifdef CONFIG_CIFS_UPCALL
|
|
struct cifs_spnego_msg *msg;
|
|
|
|
spnego_key = cifs_get_spnego_key(ses);
|
|
if (IS_ERR(spnego_key)) {
|
|
rc = PTR_ERR(spnego_key);
|
|
spnego_key = NULL;
|
|
goto ssetup_exit;
|
|
}
|
|
|
|
msg = spnego_key->payload.data;
|
|
/* check version field to make sure that cifs.upcall is
|
|
sending us a response in an expected form */
|
|
if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
|
|
cERROR(1, "incorrect version of cifs.upcall (expected"
|
|
" %d but got %d)",
|
|
CIFS_SPNEGO_UPCALL_VERSION, msg->version);
|
|
rc = -EKEYREJECTED;
|
|
goto ssetup_exit;
|
|
}
|
|
|
|
ses->auth_key.response = kmalloc(msg->sesskey_len, GFP_KERNEL);
|
|
if (!ses->auth_key.response) {
|
|
cERROR(1, "Kerberos can't allocate (%u bytes) memory",
|
|
msg->sesskey_len);
|
|
rc = -ENOMEM;
|
|
goto ssetup_exit;
|
|
}
|
|
memcpy(ses->auth_key.response, msg->data, msg->sesskey_len);
|
|
ses->auth_key.len = msg->sesskey_len;
|
|
|
|
pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
|
|
capabilities |= CAP_EXTENDED_SECURITY;
|
|
pSMB->req.Capabilities = cpu_to_le32(capabilities);
|
|
iov[1].iov_base = msg->data + msg->sesskey_len;
|
|
iov[1].iov_len = msg->secblob_len;
|
|
pSMB->req.SecurityBlobLength = cpu_to_le16(iov[1].iov_len);
|
|
|
|
if (ses->capabilities & CAP_UNICODE) {
|
|
/* unicode strings must be word aligned */
|
|
if ((iov[0].iov_len + iov[1].iov_len) % 2) {
|
|
*bcc_ptr = 0;
|
|
bcc_ptr++;
|
|
}
|
|
unicode_oslm_strings(&bcc_ptr, nls_cp);
|
|
unicode_domain_string(&bcc_ptr, ses, nls_cp);
|
|
} else
|
|
/* BB: is this right? */
|
|
ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
|
|
#else /* ! CONFIG_CIFS_UPCALL */
|
|
cERROR(1, "Kerberos negotiated but upcall support disabled!");
|
|
rc = -ENOSYS;
|
|
goto ssetup_exit;
|
|
#endif /* CONFIG_CIFS_UPCALL */
|
|
} else if (type == RawNTLMSSP) {
|
|
if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) {
|
|
cERROR(1, "NTLMSSP requires Unicode support");
|
|
rc = -ENOSYS;
|
|
goto ssetup_exit;
|
|
}
|
|
|
|
cFYI(1, "ntlmssp session setup phase %d", phase);
|
|
pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
|
|
capabilities |= CAP_EXTENDED_SECURITY;
|
|
pSMB->req.Capabilities |= cpu_to_le32(capabilities);
|
|
switch(phase) {
|
|
case NtLmNegotiate:
|
|
build_ntlmssp_negotiate_blob(
|
|
pSMB->req.SecurityBlob, ses);
|
|
iov[1].iov_len = sizeof(NEGOTIATE_MESSAGE);
|
|
iov[1].iov_base = pSMB->req.SecurityBlob;
|
|
pSMB->req.SecurityBlobLength =
|
|
cpu_to_le16(sizeof(NEGOTIATE_MESSAGE));
|
|
break;
|
|
case NtLmAuthenticate:
|
|
/*
|
|
* 5 is an empirical value, large enough to hold
|
|
* authenticate message plus max 10 of av paris,
|
|
* domain, user, workstation names, flags, etc.
|
|
*/
|
|
ntlmsspblob = kzalloc(
|
|
5*sizeof(struct _AUTHENTICATE_MESSAGE),
|
|
GFP_KERNEL);
|
|
if (!ntlmsspblob) {
|
|
cERROR(1, "Can't allocate NTLMSSP blob");
|
|
rc = -ENOMEM;
|
|
goto ssetup_exit;
|
|
}
|
|
|
|
rc = build_ntlmssp_auth_blob(ntlmsspblob,
|
|
&blob_len, ses, nls_cp);
|
|
if (rc)
|
|
goto ssetup_exit;
|
|
iov[1].iov_len = blob_len;
|
|
iov[1].iov_base = ntlmsspblob;
|
|
pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
|
|
/*
|
|
* Make sure that we tell the server that we are using
|
|
* the uid that it just gave us back on the response
|
|
* (challenge)
|
|
*/
|
|
smb_buf->Uid = ses->Suid;
|
|
break;
|
|
default:
|
|
cERROR(1, "invalid phase %d", phase);
|
|
rc = -ENOSYS;
|
|
goto ssetup_exit;
|
|
}
|
|
/* unicode strings must be word aligned */
|
|
if ((iov[0].iov_len + iov[1].iov_len) % 2) {
|
|
*bcc_ptr = 0;
|
|
bcc_ptr++;
|
|
}
|
|
unicode_oslm_strings(&bcc_ptr, nls_cp);
|
|
} else {
|
|
cERROR(1, "secType %d not supported!", type);
|
|
rc = -ENOSYS;
|
|
goto ssetup_exit;
|
|
}
|
|
|
|
iov[2].iov_base = str_area;
|
|
iov[2].iov_len = (long) bcc_ptr - (long) str_area;
|
|
|
|
count = iov[1].iov_len + iov[2].iov_len;
|
|
smb_buf->smb_buf_length =
|
|
cpu_to_be32(be32_to_cpu(smb_buf->smb_buf_length) + count);
|
|
|
|
put_bcc(count, smb_buf);
|
|
|
|
rc = SendReceive2(xid, ses, iov, 3 /* num_iovecs */, &resp_buf_type,
|
|
CIFS_LOG_ERROR);
|
|
/* SMB request buf freed in SendReceive2 */
|
|
|
|
pSMB = (SESSION_SETUP_ANDX *)iov[0].iov_base;
|
|
smb_buf = (struct smb_hdr *)iov[0].iov_base;
|
|
|
|
if ((type == RawNTLMSSP) && (smb_buf->Status.CifsError ==
|
|
cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))) {
|
|
if (phase != NtLmNegotiate) {
|
|
cERROR(1, "Unexpected more processing error");
|
|
goto ssetup_exit;
|
|
}
|
|
/* NTLMSSP Negotiate sent now processing challenge (response) */
|
|
phase = NtLmChallenge; /* process ntlmssp challenge */
|
|
rc = 0; /* MORE_PROC rc is not an error here, but expected */
|
|
}
|
|
if (rc)
|
|
goto ssetup_exit;
|
|
|
|
if ((smb_buf->WordCount != 3) && (smb_buf->WordCount != 4)) {
|
|
rc = -EIO;
|
|
cERROR(1, "bad word count %d", smb_buf->WordCount);
|
|
goto ssetup_exit;
|
|
}
|
|
action = le16_to_cpu(pSMB->resp.Action);
|
|
if (action & GUEST_LOGIN)
|
|
cFYI(1, "Guest login"); /* BB mark SesInfo struct? */
|
|
ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
|
|
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 = get_bcc(smb_buf);
|
|
bcc_ptr = pByteArea(smb_buf);
|
|
|
|
if (smb_buf->WordCount == 4) {
|
|
blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
|
|
if (blob_len > bytes_remaining) {
|
|
cERROR(1, "bad security blob length %d", blob_len);
|
|
rc = -EINVAL;
|
|
goto ssetup_exit;
|
|
}
|
|
if (phase == NtLmChallenge) {
|
|
rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses);
|
|
/* now goto beginning for ntlmssp authenticate phase */
|
|
if (rc)
|
|
goto ssetup_exit;
|
|
}
|
|
bcc_ptr += blob_len;
|
|
bytes_remaining -= blob_len;
|
|
}
|
|
|
|
/* BB check if Unicode and decode strings */
|
|
if (bytes_remaining == 0) {
|
|
/* no string area to decode, do nothing */
|
|
} else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
|
|
/* unicode string area must be word-aligned */
|
|
if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
|
|
++bcc_ptr;
|
|
--bytes_remaining;
|
|
}
|
|
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 (spnego_key) {
|
|
key_revoke(spnego_key);
|
|
key_put(spnego_key);
|
|
}
|
|
kfree(str_area);
|
|
kfree(ntlmsspblob);
|
|
ntlmsspblob = NULL;
|
|
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);
|
|
|
|
/* if ntlmssp, and negotiate succeeded, proceed to authenticate phase */
|
|
if ((phase == NtLmChallenge) && (rc == 0))
|
|
goto ssetup_ntlmssp_authenticate;
|
|
|
|
return rc;
|
|
}
|