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![Paulo Alcantara](/assets/img/avatar_default.png)
We already upcall to resolve hostnames during reconnect by calling reconn_set_ipaddr_from_hostname(), so there is no point in having a worker to periodically call it. Signed-off-by: Paulo Alcantara (SUSE) <pc@manguebit.com> Reviewed-by <lsahlber@redhat.com> Signed-off-by: Steve French <stfrench@microsoft.com>
1856 lines
49 KiB
C
1856 lines
49 KiB
C
// SPDX-License-Identifier: LGPL-2.1
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/*
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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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*/
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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 <linux/version.h>
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#include "cifsfs.h"
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#include "cifs_spnego.h"
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#include "smb2proto.h"
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#include "fs_context.h"
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static int
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cifs_ses_add_channel(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses,
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struct cifs_server_iface *iface);
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bool
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is_server_using_iface(struct TCP_Server_Info *server,
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struct cifs_server_iface *iface)
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{
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struct sockaddr_in *i4 = (struct sockaddr_in *)&iface->sockaddr;
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struct sockaddr_in6 *i6 = (struct sockaddr_in6 *)&iface->sockaddr;
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struct sockaddr_in *s4 = (struct sockaddr_in *)&server->dstaddr;
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struct sockaddr_in6 *s6 = (struct sockaddr_in6 *)&server->dstaddr;
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if (server->dstaddr.ss_family != iface->sockaddr.ss_family)
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return false;
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if (server->dstaddr.ss_family == AF_INET) {
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if (s4->sin_addr.s_addr != i4->sin_addr.s_addr)
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return false;
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} else if (server->dstaddr.ss_family == AF_INET6) {
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if (memcmp(&s6->sin6_addr, &i6->sin6_addr,
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sizeof(i6->sin6_addr)) != 0)
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return false;
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} else {
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/* unknown family.. */
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return false;
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}
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return true;
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}
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bool is_ses_using_iface(struct cifs_ses *ses, struct cifs_server_iface *iface)
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{
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int i;
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spin_lock(&ses->chan_lock);
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for (i = 0; i < ses->chan_count; i++) {
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if (ses->chans[i].iface == iface) {
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spin_unlock(&ses->chan_lock);
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return true;
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}
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}
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spin_unlock(&ses->chan_lock);
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return false;
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}
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/* channel helper functions. assumed that chan_lock is held by caller. */
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unsigned int
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cifs_ses_get_chan_index(struct cifs_ses *ses,
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struct TCP_Server_Info *server)
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{
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unsigned int i;
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for (i = 0; i < ses->chan_count; i++) {
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if (ses->chans[i].server == server)
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return i;
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}
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/* If we didn't find the channel, it is likely a bug */
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if (server)
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cifs_dbg(VFS, "unable to get chan index for server: 0x%llx",
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server->conn_id);
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WARN_ON(1);
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return 0;
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}
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void
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cifs_chan_set_in_reconnect(struct cifs_ses *ses,
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struct TCP_Server_Info *server)
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{
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unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
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ses->chans[chan_index].in_reconnect = true;
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}
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void
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cifs_chan_clear_in_reconnect(struct cifs_ses *ses,
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struct TCP_Server_Info *server)
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{
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unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
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ses->chans[chan_index].in_reconnect = false;
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}
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bool
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cifs_chan_in_reconnect(struct cifs_ses *ses,
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struct TCP_Server_Info *server)
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{
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unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
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return CIFS_CHAN_IN_RECONNECT(ses, chan_index);
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}
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void
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cifs_chan_set_need_reconnect(struct cifs_ses *ses,
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struct TCP_Server_Info *server)
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{
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unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
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set_bit(chan_index, &ses->chans_need_reconnect);
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cifs_dbg(FYI, "Set reconnect bitmask for chan %u; now 0x%lx\n",
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chan_index, ses->chans_need_reconnect);
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}
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void
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cifs_chan_clear_need_reconnect(struct cifs_ses *ses,
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struct TCP_Server_Info *server)
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{
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unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
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clear_bit(chan_index, &ses->chans_need_reconnect);
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cifs_dbg(FYI, "Cleared reconnect bitmask for chan %u; now 0x%lx\n",
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chan_index, ses->chans_need_reconnect);
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}
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bool
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cifs_chan_needs_reconnect(struct cifs_ses *ses,
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struct TCP_Server_Info *server)
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{
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unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
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return CIFS_CHAN_NEEDS_RECONNECT(ses, chan_index);
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}
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bool
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cifs_chan_is_iface_active(struct cifs_ses *ses,
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struct TCP_Server_Info *server)
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{
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unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
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return ses->chans[chan_index].iface &&
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ses->chans[chan_index].iface->is_active;
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}
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/* returns number of channels added */
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int cifs_try_adding_channels(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses)
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{
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int old_chan_count, new_chan_count;
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int left;
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int rc = 0;
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int tries = 0;
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struct cifs_server_iface *iface = NULL, *niface = NULL;
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spin_lock(&ses->chan_lock);
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new_chan_count = old_chan_count = ses->chan_count;
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left = ses->chan_max - ses->chan_count;
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if (left <= 0) {
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spin_unlock(&ses->chan_lock);
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cifs_dbg(FYI,
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"ses already at max_channels (%zu), nothing to open\n",
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ses->chan_max);
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return 0;
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}
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if (ses->server->dialect < SMB30_PROT_ID) {
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spin_unlock(&ses->chan_lock);
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cifs_dbg(VFS, "multichannel is not supported on this protocol version, use 3.0 or above\n");
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return 0;
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}
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if (!(ses->server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL)) {
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ses->chan_max = 1;
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spin_unlock(&ses->chan_lock);
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cifs_dbg(VFS, "server %s does not support multichannel\n", ses->server->hostname);
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return 0;
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}
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spin_unlock(&ses->chan_lock);
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/*
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* Keep connecting to same, fastest, iface for all channels as
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* long as its RSS. Try next fastest one if not RSS or channel
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* creation fails.
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*/
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spin_lock(&ses->iface_lock);
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iface = list_first_entry(&ses->iface_list, struct cifs_server_iface,
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iface_head);
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spin_unlock(&ses->iface_lock);
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while (left > 0) {
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tries++;
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if (tries > 3*ses->chan_max) {
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cifs_dbg(FYI, "too many channel open attempts (%d channels left to open)\n",
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left);
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break;
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}
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spin_lock(&ses->iface_lock);
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if (!ses->iface_count) {
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spin_unlock(&ses->iface_lock);
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break;
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}
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list_for_each_entry_safe_from(iface, niface, &ses->iface_list,
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iface_head) {
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/* skip ifaces that are unusable */
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if (!iface->is_active ||
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(is_ses_using_iface(ses, iface) &&
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!iface->rss_capable)) {
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continue;
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}
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/* take ref before unlock */
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kref_get(&iface->refcount);
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spin_unlock(&ses->iface_lock);
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rc = cifs_ses_add_channel(cifs_sb, ses, iface);
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spin_lock(&ses->iface_lock);
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if (rc) {
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cifs_dbg(VFS, "failed to open extra channel on iface:%pIS rc=%d\n",
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&iface->sockaddr,
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rc);
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kref_put(&iface->refcount, release_iface);
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continue;
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}
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cifs_dbg(FYI, "successfully opened new channel on iface:%pIS\n",
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&iface->sockaddr);
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break;
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}
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spin_unlock(&ses->iface_lock);
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left--;
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new_chan_count++;
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}
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return new_chan_count - old_chan_count;
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}
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/*
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* update the iface for the channel if necessary.
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* will return 0 when iface is updated, 1 if removed, 2 otherwise
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* Must be called with chan_lock held.
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*/
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int
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cifs_chan_update_iface(struct cifs_ses *ses, struct TCP_Server_Info *server)
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{
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unsigned int chan_index;
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struct cifs_server_iface *iface = NULL;
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struct cifs_server_iface *old_iface = NULL;
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int rc = 0;
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spin_lock(&ses->chan_lock);
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chan_index = cifs_ses_get_chan_index(ses, server);
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if (!chan_index) {
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spin_unlock(&ses->chan_lock);
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return 0;
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}
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if (ses->chans[chan_index].iface) {
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old_iface = ses->chans[chan_index].iface;
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if (old_iface->is_active) {
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spin_unlock(&ses->chan_lock);
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return 1;
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}
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}
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spin_unlock(&ses->chan_lock);
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spin_lock(&ses->iface_lock);
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/* then look for a new one */
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list_for_each_entry(iface, &ses->iface_list, iface_head) {
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if (!iface->is_active ||
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(is_ses_using_iface(ses, iface) &&
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!iface->rss_capable)) {
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continue;
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}
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kref_get(&iface->refcount);
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break;
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}
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if (list_entry_is_head(iface, &ses->iface_list, iface_head)) {
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rc = 1;
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iface = NULL;
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cifs_dbg(FYI, "unable to find a suitable iface\n");
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}
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/* now drop the ref to the current iface */
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if (old_iface && iface) {
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cifs_dbg(FYI, "replacing iface: %pIS with %pIS\n",
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&old_iface->sockaddr,
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&iface->sockaddr);
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kref_put(&old_iface->refcount, release_iface);
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} else if (old_iface) {
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cifs_dbg(FYI, "releasing ref to iface: %pIS\n",
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&old_iface->sockaddr);
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kref_put(&old_iface->refcount, release_iface);
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} else {
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WARN_ON(!iface);
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cifs_dbg(FYI, "adding new iface: %pIS\n", &iface->sockaddr);
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}
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spin_unlock(&ses->iface_lock);
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spin_lock(&ses->chan_lock);
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chan_index = cifs_ses_get_chan_index(ses, server);
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ses->chans[chan_index].iface = iface;
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/* No iface is found. if secondary chan, drop connection */
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if (!iface && CIFS_SERVER_IS_CHAN(server))
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ses->chans[chan_index].server = NULL;
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spin_unlock(&ses->chan_lock);
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if (!iface && CIFS_SERVER_IS_CHAN(server))
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cifs_put_tcp_session(server, false);
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return rc;
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}
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/*
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* If server is a channel of ses, return the corresponding enclosing
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* cifs_chan otherwise return NULL.
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*/
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struct cifs_chan *
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cifs_ses_find_chan(struct cifs_ses *ses, struct TCP_Server_Info *server)
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{
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int i;
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spin_lock(&ses->chan_lock);
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for (i = 0; i < ses->chan_count; i++) {
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if (ses->chans[i].server == server) {
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spin_unlock(&ses->chan_lock);
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return &ses->chans[i];
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}
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}
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spin_unlock(&ses->chan_lock);
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return NULL;
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}
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static int
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cifs_ses_add_channel(struct cifs_sb_info *cifs_sb, struct cifs_ses *ses,
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struct cifs_server_iface *iface)
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{
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struct TCP_Server_Info *chan_server;
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struct cifs_chan *chan;
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struct smb3_fs_context ctx = {NULL};
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static const char unc_fmt[] = "\\%s\\foo";
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char unc[sizeof(unc_fmt)+SERVER_NAME_LEN_WITH_NULL] = {0};
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struct sockaddr_in *ipv4 = (struct sockaddr_in *)&iface->sockaddr;
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struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)&iface->sockaddr;
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int rc;
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unsigned int xid = get_xid();
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if (iface->sockaddr.ss_family == AF_INET)
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cifs_dbg(FYI, "adding channel to ses %p (speed:%zu bps rdma:%s ip:%pI4)\n",
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ses, iface->speed, iface->rdma_capable ? "yes" : "no",
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&ipv4->sin_addr);
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else
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cifs_dbg(FYI, "adding channel to ses %p (speed:%zu bps rdma:%s ip:%pI6)\n",
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ses, iface->speed, iface->rdma_capable ? "yes" : "no",
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&ipv6->sin6_addr);
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/*
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* Setup a ctx with mostly the same info as the existing
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* session and overwrite it with the requested iface data.
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*
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* We need to setup at least the fields used for negprot and
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* sesssetup.
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*
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* We only need the ctx here, so we can reuse memory from
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* the session and server without caring about memory
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* management.
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*/
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/* Always make new connection for now (TODO?) */
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ctx.nosharesock = true;
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/* Auth */
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ctx.domainauto = ses->domainAuto;
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ctx.domainname = ses->domainName;
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/* no hostname for extra channels */
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ctx.server_hostname = "";
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ctx.username = ses->user_name;
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ctx.password = ses->password;
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ctx.sectype = ses->sectype;
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ctx.sign = ses->sign;
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/* UNC and paths */
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/* XXX: Use ses->server->hostname? */
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sprintf(unc, unc_fmt, ses->ip_addr);
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ctx.UNC = unc;
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ctx.prepath = "";
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/* Reuse same version as master connection */
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ctx.vals = ses->server->vals;
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ctx.ops = ses->server->ops;
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ctx.noblocksnd = ses->server->noblocksnd;
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ctx.noautotune = ses->server->noautotune;
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ctx.sockopt_tcp_nodelay = ses->server->tcp_nodelay;
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ctx.echo_interval = ses->server->echo_interval / HZ;
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ctx.max_credits = ses->server->max_credits;
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/*
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* This will be used for encoding/decoding user/domain/pw
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* during sess setup auth.
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*/
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ctx.local_nls = cifs_sb->local_nls;
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/* Use RDMA if possible */
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ctx.rdma = iface->rdma_capable;
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memcpy(&ctx.dstaddr, &iface->sockaddr, sizeof(struct sockaddr_storage));
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/* reuse master con client guid */
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memcpy(&ctx.client_guid, ses->server->client_guid,
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SMB2_CLIENT_GUID_SIZE);
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ctx.use_client_guid = true;
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chan_server = cifs_get_tcp_session(&ctx, ses->server);
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|
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spin_lock(&ses->chan_lock);
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chan = &ses->chans[ses->chan_count];
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chan->server = chan_server;
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if (IS_ERR(chan->server)) {
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rc = PTR_ERR(chan->server);
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chan->server = NULL;
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spin_unlock(&ses->chan_lock);
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goto out;
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}
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chan->iface = iface;
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ses->chan_count++;
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atomic_set(&ses->chan_seq, 0);
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|
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/* Mark this channel as needing connect/setup */
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cifs_chan_set_need_reconnect(ses, chan->server);
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spin_unlock(&ses->chan_lock);
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mutex_lock(&ses->session_mutex);
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/*
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* We need to allocate the server crypto now as we will need
|
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* to sign packets before we generate the channel signing key
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* (we sign with the session key)
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*/
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rc = smb311_crypto_shash_allocate(chan->server);
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if (rc) {
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cifs_dbg(VFS, "%s: crypto alloc failed\n", __func__);
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mutex_unlock(&ses->session_mutex);
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goto out;
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}
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rc = cifs_negotiate_protocol(xid, ses, chan->server);
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if (!rc)
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rc = cifs_setup_session(xid, ses, chan->server, cifs_sb->local_nls);
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mutex_unlock(&ses->session_mutex);
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out:
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if (rc && chan->server) {
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/*
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* we should avoid race with these delayed works before we
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* remove this channel
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*/
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cancel_delayed_work_sync(&chan->server->echo);
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cancel_delayed_work_sync(&chan->server->reconnect);
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|
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spin_lock(&ses->chan_lock);
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/* we rely on all bits beyond chan_count to be clear */
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cifs_chan_clear_need_reconnect(ses, chan->server);
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ses->chan_count--;
|
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/*
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* chan_count should never reach 0 as at least the primary
|
|
* channel is always allocated
|
|
*/
|
|
WARN_ON(ses->chan_count < 1);
|
|
spin_unlock(&ses->chan_lock);
|
|
|
|
cifs_put_tcp_session(chan->server, 0);
|
|
}
|
|
|
|
free_xid(xid);
|
|
return rc;
|
|
}
|
|
|
|
#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
|
|
static __u32 cifs_ssetup_hdr(struct cifs_ses *ses,
|
|
struct TCP_Server_Info *server,
|
|
SESSION_SETUP_ANDX *pSMB)
|
|
{
|
|
__u32 capabilities = 0;
|
|
|
|
/* init fields common to all four types of SessSetup */
|
|
/* Note that offsets for first seven fields in req struct are same */
|
|
/* in CIFS Specs so does not matter which of 3 forms of struct */
|
|
/* that we use in next few lines */
|
|
/* Note that header is initialized to zero in header_assemble */
|
|
pSMB->req.AndXCommand = 0xFF;
|
|
pSMB->req.MaxBufferSize = cpu_to_le16(min_t(u32,
|
|
CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4,
|
|
USHRT_MAX));
|
|
pSMB->req.MaxMpxCount = cpu_to_le16(server->maxReq);
|
|
pSMB->req.VcNumber = cpu_to_le16(1);
|
|
|
|
/* Now no need to set SMBFLG_CASELESS or obsolete CANONICAL PATH */
|
|
|
|
/* BB verify whether signing required on neg or just on auth frame
|
|
(and NTLM case) */
|
|
|
|
capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS |
|
|
CAP_LARGE_WRITE_X | CAP_LARGE_READ_X;
|
|
|
|
if (server->sign)
|
|
pSMB->req.hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE;
|
|
|
|
if (ses->capabilities & CAP_UNICODE) {
|
|
pSMB->req.hdr.Flags2 |= SMBFLG2_UNICODE;
|
|
capabilities |= CAP_UNICODE;
|
|
}
|
|
if (ses->capabilities & CAP_STATUS32) {
|
|
pSMB->req.hdr.Flags2 |= SMBFLG2_ERR_STATUS;
|
|
capabilities |= CAP_STATUS32;
|
|
}
|
|
if (ses->capabilities & CAP_DFS) {
|
|
pSMB->req.hdr.Flags2 |= SMBFLG2_DFS;
|
|
capabilities |= CAP_DFS;
|
|
}
|
|
if (ses->capabilities & CAP_UNIX)
|
|
capabilities |= CAP_UNIX;
|
|
|
|
return capabilities;
|
|
}
|
|
|
|
static void
|
|
unicode_oslm_strings(char **pbcc_area, const struct nls_table *nls_cp)
|
|
{
|
|
char *bcc_ptr = *pbcc_area;
|
|
int bytes_ret = 0;
|
|
|
|
/* Copy OS version */
|
|
bytes_ret = cifs_strtoUTF16((__le16 *)bcc_ptr, "Linux version ", 32,
|
|
nls_cp);
|
|
bcc_ptr += 2 * bytes_ret;
|
|
bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, init_utsname()->release,
|
|
32, nls_cp);
|
|
bcc_ptr += 2 * bytes_ret;
|
|
bcc_ptr += 2; /* trailing null */
|
|
|
|
bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS,
|
|
32, nls_cp);
|
|
bcc_ptr += 2 * bytes_ret;
|
|
bcc_ptr += 2; /* trailing null */
|
|
|
|
*pbcc_area = bcc_ptr;
|
|
}
|
|
|
|
static void unicode_domain_string(char **pbcc_area, struct cifs_ses *ses,
|
|
const struct nls_table *nls_cp)
|
|
{
|
|
char *bcc_ptr = *pbcc_area;
|
|
int bytes_ret = 0;
|
|
|
|
/* copy domain */
|
|
if (ses->domainName == NULL) {
|
|
/* Sending null domain better than using a bogus domain name (as
|
|
we did briefly in 2.6.18) since server will use its default */
|
|
*bcc_ptr = 0;
|
|
*(bcc_ptr+1) = 0;
|
|
bytes_ret = 0;
|
|
} else
|
|
bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->domainName,
|
|
CIFS_MAX_DOMAINNAME_LEN, nls_cp);
|
|
bcc_ptr += 2 * bytes_ret;
|
|
bcc_ptr += 2; /* account for null terminator */
|
|
|
|
*pbcc_area = bcc_ptr;
|
|
}
|
|
|
|
static void unicode_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
|
|
const struct nls_table *nls_cp)
|
|
{
|
|
char *bcc_ptr = *pbcc_area;
|
|
int bytes_ret = 0;
|
|
|
|
/* BB FIXME add check that strings total less
|
|
than 335 or will need to send them as arrays */
|
|
|
|
/* copy user */
|
|
if (ses->user_name == NULL) {
|
|
/* null user mount */
|
|
*bcc_ptr = 0;
|
|
*(bcc_ptr+1) = 0;
|
|
} else {
|
|
bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->user_name,
|
|
CIFS_MAX_USERNAME_LEN, nls_cp);
|
|
}
|
|
bcc_ptr += 2 * bytes_ret;
|
|
bcc_ptr += 2; /* account for null termination */
|
|
|
|
unicode_domain_string(&bcc_ptr, ses, nls_cp);
|
|
unicode_oslm_strings(&bcc_ptr, nls_cp);
|
|
|
|
*pbcc_area = bcc_ptr;
|
|
}
|
|
|
|
static void ascii_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,
|
|
const struct nls_table *nls_cp)
|
|
{
|
|
char *bcc_ptr = *pbcc_area;
|
|
int len;
|
|
|
|
/* copy user */
|
|
/* BB what about null user mounts - check that we do this BB */
|
|
/* copy user */
|
|
if (ses->user_name != NULL) {
|
|
len = strscpy(bcc_ptr, ses->user_name, CIFS_MAX_USERNAME_LEN);
|
|
if (WARN_ON_ONCE(len < 0))
|
|
len = CIFS_MAX_USERNAME_LEN - 1;
|
|
bcc_ptr += len;
|
|
}
|
|
/* else null user mount */
|
|
*bcc_ptr = 0;
|
|
bcc_ptr++; /* account for null termination */
|
|
|
|
/* copy domain */
|
|
if (ses->domainName != NULL) {
|
|
len = strscpy(bcc_ptr, ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
|
|
if (WARN_ON_ONCE(len < 0))
|
|
len = CIFS_MAX_DOMAINNAME_LEN - 1;
|
|
bcc_ptr += len;
|
|
} /* else we will send a null domain name
|
|
so the server will default to its own domain */
|
|
*bcc_ptr = 0;
|
|
bcc_ptr++;
|
|
|
|
/* BB check for overflow here */
|
|
|
|
strcpy(bcc_ptr, "Linux version ");
|
|
bcc_ptr += strlen("Linux version ");
|
|
strcpy(bcc_ptr, init_utsname()->release);
|
|
bcc_ptr += strlen(init_utsname()->release) + 1;
|
|
|
|
strcpy(bcc_ptr, CIFS_NETWORK_OPSYS);
|
|
bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1;
|
|
|
|
*pbcc_area = bcc_ptr;
|
|
}
|
|
|
|
static void
|
|
decode_unicode_ssetup(char **pbcc_area, int bleft, struct cifs_ses *ses,
|
|
const struct nls_table *nls_cp)
|
|
{
|
|
int len;
|
|
char *data = *pbcc_area;
|
|
|
|
cifs_dbg(FYI, "bleft %d\n", bleft);
|
|
|
|
kfree(ses->serverOS);
|
|
ses->serverOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
|
|
cifs_dbg(FYI, "serverOS=%s\n", ses->serverOS);
|
|
len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
|
|
data += len;
|
|
bleft -= len;
|
|
if (bleft <= 0)
|
|
return;
|
|
|
|
kfree(ses->serverNOS);
|
|
ses->serverNOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
|
|
cifs_dbg(FYI, "serverNOS=%s\n", ses->serverNOS);
|
|
len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;
|
|
data += len;
|
|
bleft -= len;
|
|
if (bleft <= 0)
|
|
return;
|
|
|
|
kfree(ses->serverDomain);
|
|
ses->serverDomain = cifs_strndup_from_utf16(data, bleft, true, nls_cp);
|
|
cifs_dbg(FYI, "serverDomain=%s\n", ses->serverDomain);
|
|
|
|
return;
|
|
}
|
|
|
|
static void decode_ascii_ssetup(char **pbcc_area, __u16 bleft,
|
|
struct cifs_ses *ses,
|
|
const struct nls_table *nls_cp)
|
|
{
|
|
int len;
|
|
char *bcc_ptr = *pbcc_area;
|
|
|
|
cifs_dbg(FYI, "decode sessetup ascii. bleft %d\n", bleft);
|
|
|
|
len = strnlen(bcc_ptr, bleft);
|
|
if (len >= bleft)
|
|
return;
|
|
|
|
kfree(ses->serverOS);
|
|
|
|
ses->serverOS = kmalloc(len + 1, GFP_KERNEL);
|
|
if (ses->serverOS) {
|
|
memcpy(ses->serverOS, bcc_ptr, len);
|
|
ses->serverOS[len] = 0;
|
|
if (strncmp(ses->serverOS, "OS/2", 4) == 0)
|
|
cifs_dbg(FYI, "OS/2 server\n");
|
|
}
|
|
|
|
bcc_ptr += len + 1;
|
|
bleft -= len + 1;
|
|
|
|
len = strnlen(bcc_ptr, bleft);
|
|
if (len >= bleft)
|
|
return;
|
|
|
|
kfree(ses->serverNOS);
|
|
|
|
ses->serverNOS = kmalloc(len + 1, GFP_KERNEL);
|
|
if (ses->serverNOS) {
|
|
memcpy(ses->serverNOS, bcc_ptr, len);
|
|
ses->serverNOS[len] = 0;
|
|
}
|
|
|
|
bcc_ptr += len + 1;
|
|
bleft -= len + 1;
|
|
|
|
len = strnlen(bcc_ptr, bleft);
|
|
if (len > bleft)
|
|
return;
|
|
|
|
/* No domain field in LANMAN case. Domain is
|
|
returned by old servers in the SMB negprot response */
|
|
/* BB For newer servers which do not support Unicode,
|
|
but thus do return domain here we could add parsing
|
|
for it later, but it is not very important */
|
|
cifs_dbg(FYI, "ascii: bytes left %d\n", bleft);
|
|
}
|
|
#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
|
|
|
|
int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len,
|
|
struct cifs_ses *ses)
|
|
{
|
|
unsigned int tioffset; /* challenge message target info area */
|
|
unsigned int tilen; /* challenge message target info area length */
|
|
CHALLENGE_MESSAGE *pblob = (CHALLENGE_MESSAGE *)bcc_ptr;
|
|
__u32 server_flags;
|
|
|
|
if (blob_len < sizeof(CHALLENGE_MESSAGE)) {
|
|
cifs_dbg(VFS, "challenge blob len %d too small\n", blob_len);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (memcmp(pblob->Signature, "NTLMSSP", 8)) {
|
|
cifs_dbg(VFS, "blob signature incorrect %s\n",
|
|
pblob->Signature);
|
|
return -EINVAL;
|
|
}
|
|
if (pblob->MessageType != NtLmChallenge) {
|
|
cifs_dbg(VFS, "Incorrect message type %d\n",
|
|
pblob->MessageType);
|
|
return -EINVAL;
|
|
}
|
|
|
|
server_flags = le32_to_cpu(pblob->NegotiateFlags);
|
|
cifs_dbg(FYI, "%s: negotiate=0x%08x challenge=0x%08x\n", __func__,
|
|
ses->ntlmssp->client_flags, server_flags);
|
|
|
|
if ((ses->ntlmssp->client_flags & (NTLMSSP_NEGOTIATE_SEAL | NTLMSSP_NEGOTIATE_SIGN)) &&
|
|
(!(server_flags & NTLMSSP_NEGOTIATE_56) && !(server_flags & NTLMSSP_NEGOTIATE_128))) {
|
|
cifs_dbg(VFS, "%s: requested signing/encryption but server did not return either 56-bit or 128-bit session key size\n",
|
|
__func__);
|
|
return -EINVAL;
|
|
}
|
|
if (!(server_flags & NTLMSSP_NEGOTIATE_NTLM) && !(server_flags & NTLMSSP_NEGOTIATE_EXTENDED_SEC)) {
|
|
cifs_dbg(VFS, "%s: server does not seem to support either NTLMv1 or NTLMv2\n", __func__);
|
|
return -EINVAL;
|
|
}
|
|
if (ses->server->sign && !(server_flags & NTLMSSP_NEGOTIATE_SIGN)) {
|
|
cifs_dbg(VFS, "%s: forced packet signing but server does not seem to support it\n",
|
|
__func__);
|
|
return -EOPNOTSUPP;
|
|
}
|
|
if ((ses->ntlmssp->client_flags & NTLMSSP_NEGOTIATE_KEY_XCH) &&
|
|
!(server_flags & NTLMSSP_NEGOTIATE_KEY_XCH))
|
|
pr_warn_once("%s: authentication has been weakened as server does not support key exchange\n",
|
|
__func__);
|
|
|
|
ses->ntlmssp->server_flags = server_flags;
|
|
|
|
memcpy(ses->ntlmssp->cryptkey, pblob->Challenge, CIFS_CRYPTO_KEY_SIZE);
|
|
/* In particular we can examine sign flags */
|
|
/* BB spec says that if AvId field of MsvAvTimestamp is populated then
|
|
we must set the MIC field of the AUTHENTICATE_MESSAGE */
|
|
|
|
tioffset = le32_to_cpu(pblob->TargetInfoArray.BufferOffset);
|
|
tilen = le16_to_cpu(pblob->TargetInfoArray.Length);
|
|
if (tioffset > blob_len || tioffset + tilen > blob_len) {
|
|
cifs_dbg(VFS, "tioffset + tilen too high %u + %u\n",
|
|
tioffset, tilen);
|
|
return -EINVAL;
|
|
}
|
|
if (tilen) {
|
|
kfree_sensitive(ses->auth_key.response);
|
|
ses->auth_key.response = kmemdup(bcc_ptr + tioffset, tilen,
|
|
GFP_KERNEL);
|
|
if (!ses->auth_key.response) {
|
|
cifs_dbg(VFS, "Challenge target info alloc failure\n");
|
|
return -ENOMEM;
|
|
}
|
|
ses->auth_key.len = tilen;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int size_of_ntlmssp_blob(struct cifs_ses *ses, int base_size)
|
|
{
|
|
int sz = base_size + ses->auth_key.len
|
|
- CIFS_SESS_KEY_SIZE + CIFS_CPHTXT_SIZE + 2;
|
|
|
|
if (ses->domainName)
|
|
sz += sizeof(__le16) * strnlen(ses->domainName, CIFS_MAX_DOMAINNAME_LEN);
|
|
else
|
|
sz += sizeof(__le16);
|
|
|
|
if (ses->user_name)
|
|
sz += sizeof(__le16) * strnlen(ses->user_name, CIFS_MAX_USERNAME_LEN);
|
|
else
|
|
sz += sizeof(__le16);
|
|
|
|
if (ses->workstation_name[0])
|
|
sz += sizeof(__le16) * strnlen(ses->workstation_name,
|
|
ntlmssp_workstation_name_size(ses));
|
|
else
|
|
sz += sizeof(__le16);
|
|
|
|
return sz;
|
|
}
|
|
|
|
static inline void cifs_security_buffer_from_str(SECURITY_BUFFER *pbuf,
|
|
char *str_value,
|
|
int str_length,
|
|
unsigned char *pstart,
|
|
unsigned char **pcur,
|
|
const struct nls_table *nls_cp)
|
|
{
|
|
unsigned char *tmp = pstart;
|
|
int len;
|
|
|
|
if (!pbuf)
|
|
return;
|
|
|
|
if (!pcur)
|
|
pcur = &tmp;
|
|
|
|
if (!str_value) {
|
|
pbuf->BufferOffset = cpu_to_le32(*pcur - pstart);
|
|
pbuf->Length = 0;
|
|
pbuf->MaximumLength = 0;
|
|
*pcur += sizeof(__le16);
|
|
} else {
|
|
len = cifs_strtoUTF16((__le16 *)*pcur,
|
|
str_value,
|
|
str_length,
|
|
nls_cp);
|
|
len *= sizeof(__le16);
|
|
pbuf->BufferOffset = cpu_to_le32(*pcur - pstart);
|
|
pbuf->Length = cpu_to_le16(len);
|
|
pbuf->MaximumLength = cpu_to_le16(len);
|
|
*pcur += len;
|
|
}
|
|
}
|
|
|
|
/* BB Move to ntlmssp.c eventually */
|
|
|
|
int build_ntlmssp_negotiate_blob(unsigned char **pbuffer,
|
|
u16 *buflen,
|
|
struct cifs_ses *ses,
|
|
struct TCP_Server_Info *server,
|
|
const struct nls_table *nls_cp)
|
|
{
|
|
int rc = 0;
|
|
NEGOTIATE_MESSAGE *sec_blob;
|
|
__u32 flags;
|
|
unsigned char *tmp;
|
|
int len;
|
|
|
|
len = size_of_ntlmssp_blob(ses, sizeof(NEGOTIATE_MESSAGE));
|
|
*pbuffer = kmalloc(len, GFP_KERNEL);
|
|
if (!*pbuffer) {
|
|
rc = -ENOMEM;
|
|
cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc);
|
|
*buflen = 0;
|
|
goto setup_ntlm_neg_ret;
|
|
}
|
|
sec_blob = (NEGOTIATE_MESSAGE *)*pbuffer;
|
|
|
|
memset(*pbuffer, 0, sizeof(NEGOTIATE_MESSAGE));
|
|
memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
|
|
sec_blob->MessageType = NtLmNegotiate;
|
|
|
|
/* BB is NTLMV2 session security format easier to use here? */
|
|
flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET |
|
|
NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
|
|
NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC |
|
|
NTLMSSP_NEGOTIATE_ALWAYS_SIGN | NTLMSSP_NEGOTIATE_SEAL |
|
|
NTLMSSP_NEGOTIATE_SIGN;
|
|
if (!server->session_estab || ses->ntlmssp->sesskey_per_smbsess)
|
|
flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
|
|
|
|
tmp = *pbuffer + sizeof(NEGOTIATE_MESSAGE);
|
|
ses->ntlmssp->client_flags = flags;
|
|
sec_blob->NegotiateFlags = cpu_to_le32(flags);
|
|
|
|
/* these fields should be null in negotiate phase MS-NLMP 3.1.5.1.1 */
|
|
cifs_security_buffer_from_str(&sec_blob->DomainName,
|
|
NULL,
|
|
CIFS_MAX_DOMAINNAME_LEN,
|
|
*pbuffer, &tmp,
|
|
nls_cp);
|
|
|
|
cifs_security_buffer_from_str(&sec_blob->WorkstationName,
|
|
NULL,
|
|
CIFS_MAX_WORKSTATION_LEN,
|
|
*pbuffer, &tmp,
|
|
nls_cp);
|
|
|
|
*buflen = tmp - *pbuffer;
|
|
setup_ntlm_neg_ret:
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* Build ntlmssp blob with additional fields, such as version,
|
|
* supported by modern servers. For safety limit to SMB3 or later
|
|
* See notes in MS-NLMP Section 2.2.2.1 e.g.
|
|
*/
|
|
int build_ntlmssp_smb3_negotiate_blob(unsigned char **pbuffer,
|
|
u16 *buflen,
|
|
struct cifs_ses *ses,
|
|
struct TCP_Server_Info *server,
|
|
const struct nls_table *nls_cp)
|
|
{
|
|
int rc = 0;
|
|
struct negotiate_message *sec_blob;
|
|
__u32 flags;
|
|
unsigned char *tmp;
|
|
int len;
|
|
|
|
len = size_of_ntlmssp_blob(ses, sizeof(struct negotiate_message));
|
|
*pbuffer = kmalloc(len, GFP_KERNEL);
|
|
if (!*pbuffer) {
|
|
rc = -ENOMEM;
|
|
cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc);
|
|
*buflen = 0;
|
|
goto setup_ntlm_smb3_neg_ret;
|
|
}
|
|
sec_blob = (struct negotiate_message *)*pbuffer;
|
|
|
|
memset(*pbuffer, 0, sizeof(struct negotiate_message));
|
|
memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
|
|
sec_blob->MessageType = NtLmNegotiate;
|
|
|
|
/* BB is NTLMV2 session security format easier to use here? */
|
|
flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET |
|
|
NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |
|
|
NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC |
|
|
NTLMSSP_NEGOTIATE_ALWAYS_SIGN | NTLMSSP_NEGOTIATE_SEAL |
|
|
NTLMSSP_NEGOTIATE_SIGN | NTLMSSP_NEGOTIATE_VERSION;
|
|
if (!server->session_estab || ses->ntlmssp->sesskey_per_smbsess)
|
|
flags |= NTLMSSP_NEGOTIATE_KEY_XCH;
|
|
|
|
sec_blob->Version.ProductMajorVersion = LINUX_VERSION_MAJOR;
|
|
sec_blob->Version.ProductMinorVersion = LINUX_VERSION_PATCHLEVEL;
|
|
sec_blob->Version.ProductBuild = cpu_to_le16(SMB3_PRODUCT_BUILD);
|
|
sec_blob->Version.NTLMRevisionCurrent = NTLMSSP_REVISION_W2K3;
|
|
|
|
tmp = *pbuffer + sizeof(struct negotiate_message);
|
|
ses->ntlmssp->client_flags = flags;
|
|
sec_blob->NegotiateFlags = cpu_to_le32(flags);
|
|
|
|
/* these fields should be null in negotiate phase MS-NLMP 3.1.5.1.1 */
|
|
cifs_security_buffer_from_str(&sec_blob->DomainName,
|
|
NULL,
|
|
CIFS_MAX_DOMAINNAME_LEN,
|
|
*pbuffer, &tmp,
|
|
nls_cp);
|
|
|
|
cifs_security_buffer_from_str(&sec_blob->WorkstationName,
|
|
NULL,
|
|
CIFS_MAX_WORKSTATION_LEN,
|
|
*pbuffer, &tmp,
|
|
nls_cp);
|
|
|
|
*buflen = tmp - *pbuffer;
|
|
setup_ntlm_smb3_neg_ret:
|
|
return rc;
|
|
}
|
|
|
|
|
|
int build_ntlmssp_auth_blob(unsigned char **pbuffer,
|
|
u16 *buflen,
|
|
struct cifs_ses *ses,
|
|
struct TCP_Server_Info *server,
|
|
const struct nls_table *nls_cp)
|
|
{
|
|
int rc;
|
|
AUTHENTICATE_MESSAGE *sec_blob;
|
|
__u32 flags;
|
|
unsigned char *tmp;
|
|
int len;
|
|
|
|
rc = setup_ntlmv2_rsp(ses, nls_cp);
|
|
if (rc) {
|
|
cifs_dbg(VFS, "Error %d during NTLMSSP authentication\n", rc);
|
|
*buflen = 0;
|
|
goto setup_ntlmv2_ret;
|
|
}
|
|
|
|
len = size_of_ntlmssp_blob(ses, sizeof(AUTHENTICATE_MESSAGE));
|
|
*pbuffer = kmalloc(len, GFP_KERNEL);
|
|
if (!*pbuffer) {
|
|
rc = -ENOMEM;
|
|
cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc);
|
|
*buflen = 0;
|
|
goto setup_ntlmv2_ret;
|
|
}
|
|
sec_blob = (AUTHENTICATE_MESSAGE *)*pbuffer;
|
|
|
|
memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);
|
|
sec_blob->MessageType = NtLmAuthenticate;
|
|
|
|
flags = ses->ntlmssp->server_flags | NTLMSSP_REQUEST_TARGET |
|
|
NTLMSSP_NEGOTIATE_TARGET_INFO | NTLMSSP_NEGOTIATE_WORKSTATION_SUPPLIED;
|
|
|
|
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);
|
|
if (ses->user_name != NULL) {
|
|
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);
|
|
} else {
|
|
/*
|
|
* don't send an NT Response for anonymous access
|
|
*/
|
|
sec_blob->NtChallengeResponse.Length = 0;
|
|
sec_blob->NtChallengeResponse.MaximumLength = 0;
|
|
}
|
|
|
|
cifs_security_buffer_from_str(&sec_blob->DomainName,
|
|
ses->domainName,
|
|
CIFS_MAX_DOMAINNAME_LEN,
|
|
*pbuffer, &tmp,
|
|
nls_cp);
|
|
|
|
cifs_security_buffer_from_str(&sec_blob->UserName,
|
|
ses->user_name,
|
|
CIFS_MAX_USERNAME_LEN,
|
|
*pbuffer, &tmp,
|
|
nls_cp);
|
|
|
|
cifs_security_buffer_from_str(&sec_blob->WorkstationName,
|
|
ses->workstation_name,
|
|
ntlmssp_workstation_name_size(ses),
|
|
*pbuffer, &tmp,
|
|
nls_cp);
|
|
|
|
if ((ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_KEY_XCH) &&
|
|
(!ses->server->session_estab || ses->ntlmssp->sesskey_per_smbsess) &&
|
|
!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;
|
|
}
|
|
|
|
*buflen = tmp - *pbuffer;
|
|
setup_ntlmv2_ret:
|
|
return rc;
|
|
}
|
|
|
|
enum securityEnum
|
|
cifs_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)
|
|
{
|
|
switch (server->negflavor) {
|
|
case CIFS_NEGFLAVOR_EXTENDED:
|
|
switch (requested) {
|
|
case Kerberos:
|
|
case RawNTLMSSP:
|
|
return requested;
|
|
case Unspecified:
|
|
if (server->sec_ntlmssp &&
|
|
(global_secflags & CIFSSEC_MAY_NTLMSSP))
|
|
return RawNTLMSSP;
|
|
if ((server->sec_kerberos || server->sec_mskerberos) &&
|
|
(global_secflags & CIFSSEC_MAY_KRB5))
|
|
return Kerberos;
|
|
fallthrough;
|
|
default:
|
|
return Unspecified;
|
|
}
|
|
case CIFS_NEGFLAVOR_UNENCAP:
|
|
switch (requested) {
|
|
case NTLMv2:
|
|
return requested;
|
|
case Unspecified:
|
|
if (global_secflags & CIFSSEC_MAY_NTLMV2)
|
|
return NTLMv2;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
fallthrough;
|
|
default:
|
|
return Unspecified;
|
|
}
|
|
}
|
|
|
|
struct sess_data {
|
|
unsigned int xid;
|
|
struct cifs_ses *ses;
|
|
struct TCP_Server_Info *server;
|
|
struct nls_table *nls_cp;
|
|
void (*func)(struct sess_data *);
|
|
int result;
|
|
|
|
/* 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
|
|
*/
|
|
int buf0_type;
|
|
struct kvec iov[3];
|
|
};
|
|
|
|
#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
|
|
static int
|
|
sess_alloc_buffer(struct sess_data *sess_data, int wct)
|
|
{
|
|
int rc;
|
|
struct cifs_ses *ses = sess_data->ses;
|
|
struct smb_hdr *smb_buf;
|
|
|
|
rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses,
|
|
(void **)&smb_buf);
|
|
|
|
if (rc)
|
|
return rc;
|
|
|
|
sess_data->iov[0].iov_base = (char *)smb_buf;
|
|
sess_data->iov[0].iov_len = be32_to_cpu(smb_buf->smb_buf_length) + 4;
|
|
/*
|
|
* This variable will be used to clear the buffer
|
|
* allocated above in case of any error in the calling function.
|
|
*/
|
|
sess_data->buf0_type = CIFS_SMALL_BUFFER;
|
|
|
|
/* 2000 big enough to fit max user, domain, NOS name etc. */
|
|
sess_data->iov[2].iov_base = kmalloc(2000, GFP_KERNEL);
|
|
if (!sess_data->iov[2].iov_base) {
|
|
rc = -ENOMEM;
|
|
goto out_free_smb_buf;
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_free_smb_buf:
|
|
cifs_small_buf_release(smb_buf);
|
|
sess_data->iov[0].iov_base = NULL;
|
|
sess_data->iov[0].iov_len = 0;
|
|
sess_data->buf0_type = CIFS_NO_BUFFER;
|
|
return rc;
|
|
}
|
|
|
|
static void
|
|
sess_free_buffer(struct sess_data *sess_data)
|
|
{
|
|
struct kvec *iov = sess_data->iov;
|
|
|
|
/*
|
|
* Zero the session data before freeing, as it might contain sensitive info (keys, etc).
|
|
* Note that iov[1] is already freed by caller.
|
|
*/
|
|
if (sess_data->buf0_type != CIFS_NO_BUFFER && iov[0].iov_base)
|
|
memzero_explicit(iov[0].iov_base, iov[0].iov_len);
|
|
|
|
free_rsp_buf(sess_data->buf0_type, iov[0].iov_base);
|
|
sess_data->buf0_type = CIFS_NO_BUFFER;
|
|
kfree_sensitive(iov[2].iov_base);
|
|
}
|
|
|
|
static int
|
|
sess_establish_session(struct sess_data *sess_data)
|
|
{
|
|
struct cifs_ses *ses = sess_data->ses;
|
|
struct TCP_Server_Info *server = sess_data->server;
|
|
|
|
cifs_server_lock(server);
|
|
if (!server->session_estab) {
|
|
if (server->sign) {
|
|
server->session_key.response =
|
|
kmemdup(ses->auth_key.response,
|
|
ses->auth_key.len, GFP_KERNEL);
|
|
if (!server->session_key.response) {
|
|
cifs_server_unlock(server);
|
|
return -ENOMEM;
|
|
}
|
|
server->session_key.len =
|
|
ses->auth_key.len;
|
|
}
|
|
server->sequence_number = 0x2;
|
|
server->session_estab = true;
|
|
}
|
|
cifs_server_unlock(server);
|
|
|
|
cifs_dbg(FYI, "CIFS session established successfully\n");
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
sess_sendreceive(struct sess_data *sess_data)
|
|
{
|
|
int rc;
|
|
struct smb_hdr *smb_buf = (struct smb_hdr *) sess_data->iov[0].iov_base;
|
|
__u16 count;
|
|
struct kvec rsp_iov = { NULL, 0 };
|
|
|
|
count = sess_data->iov[1].iov_len + sess_data->iov[2].iov_len;
|
|
be32_add_cpu(&smb_buf->smb_buf_length, count);
|
|
put_bcc(count, smb_buf);
|
|
|
|
rc = SendReceive2(sess_data->xid, sess_data->ses,
|
|
sess_data->iov, 3 /* num_iovecs */,
|
|
&sess_data->buf0_type,
|
|
CIFS_LOG_ERROR, &rsp_iov);
|
|
cifs_small_buf_release(sess_data->iov[0].iov_base);
|
|
memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));
|
|
|
|
return rc;
|
|
}
|
|
|
|
static void
|
|
sess_auth_ntlmv2(struct sess_data *sess_data)
|
|
{
|
|
int rc = 0;
|
|
struct smb_hdr *smb_buf;
|
|
SESSION_SETUP_ANDX *pSMB;
|
|
char *bcc_ptr;
|
|
struct cifs_ses *ses = sess_data->ses;
|
|
struct TCP_Server_Info *server = sess_data->server;
|
|
__u32 capabilities;
|
|
__u16 bytes_remaining;
|
|
|
|
/* old style NTLM sessionsetup */
|
|
/* wct = 13 */
|
|
rc = sess_alloc_buffer(sess_data, 13);
|
|
if (rc)
|
|
goto out;
|
|
|
|
pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
|
|
bcc_ptr = sess_data->iov[2].iov_base;
|
|
capabilities = cifs_ssetup_hdr(ses, server, pSMB);
|
|
|
|
pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
|
|
|
|
/* LM2 password would be here if we supported it */
|
|
pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;
|
|
|
|
if (ses->user_name != NULL) {
|
|
/* calculate nlmv2 response and session key */
|
|
rc = setup_ntlmv2_rsp(ses, sess_data->nls_cp);
|
|
if (rc) {
|
|
cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n", rc);
|
|
goto out;
|
|
}
|
|
|
|
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);
|
|
} else {
|
|
pSMB->req_no_secext.CaseSensitivePasswordLength = 0;
|
|
}
|
|
|
|
if (ses->capabilities & CAP_UNICODE) {
|
|
if (!IS_ALIGNED(sess_data->iov[0].iov_len, 2)) {
|
|
*bcc_ptr = 0;
|
|
bcc_ptr++;
|
|
}
|
|
unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
|
|
} else {
|
|
ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
|
|
}
|
|
|
|
|
|
sess_data->iov[2].iov_len = (long) bcc_ptr -
|
|
(long) sess_data->iov[2].iov_base;
|
|
|
|
rc = sess_sendreceive(sess_data);
|
|
if (rc)
|
|
goto out;
|
|
|
|
pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
|
|
smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
|
|
|
|
if (smb_buf->WordCount != 3) {
|
|
rc = -EIO;
|
|
cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
|
|
goto out;
|
|
}
|
|
|
|
if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
|
|
cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
|
|
|
|
ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
|
|
cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
|
|
|
|
bytes_remaining = get_bcc(smb_buf);
|
|
bcc_ptr = pByteArea(smb_buf);
|
|
|
|
/* 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 (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) {
|
|
++bcc_ptr;
|
|
--bytes_remaining;
|
|
}
|
|
decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
|
|
sess_data->nls_cp);
|
|
} else {
|
|
decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
|
|
sess_data->nls_cp);
|
|
}
|
|
|
|
rc = sess_establish_session(sess_data);
|
|
out:
|
|
sess_data->result = rc;
|
|
sess_data->func = NULL;
|
|
sess_free_buffer(sess_data);
|
|
kfree_sensitive(ses->auth_key.response);
|
|
ses->auth_key.response = NULL;
|
|
}
|
|
|
|
#ifdef CONFIG_CIFS_UPCALL
|
|
static void
|
|
sess_auth_kerberos(struct sess_data *sess_data)
|
|
{
|
|
int rc = 0;
|
|
struct smb_hdr *smb_buf;
|
|
SESSION_SETUP_ANDX *pSMB;
|
|
char *bcc_ptr;
|
|
struct cifs_ses *ses = sess_data->ses;
|
|
struct TCP_Server_Info *server = sess_data->server;
|
|
__u32 capabilities;
|
|
__u16 bytes_remaining;
|
|
struct key *spnego_key = NULL;
|
|
struct cifs_spnego_msg *msg;
|
|
u16 blob_len;
|
|
|
|
/* extended security */
|
|
/* wct = 12 */
|
|
rc = sess_alloc_buffer(sess_data, 12);
|
|
if (rc)
|
|
goto out;
|
|
|
|
pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
|
|
bcc_ptr = sess_data->iov[2].iov_base;
|
|
capabilities = cifs_ssetup_hdr(ses, server, pSMB);
|
|
|
|
spnego_key = cifs_get_spnego_key(ses, server);
|
|
if (IS_ERR(spnego_key)) {
|
|
rc = PTR_ERR(spnego_key);
|
|
spnego_key = NULL;
|
|
goto out;
|
|
}
|
|
|
|
msg = spnego_key->payload.data[0];
|
|
/*
|
|
* 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) {
|
|
cifs_dbg(VFS, "incorrect version of cifs.upcall (expected %d but got %d)\n",
|
|
CIFS_SPNEGO_UPCALL_VERSION, msg->version);
|
|
rc = -EKEYREJECTED;
|
|
goto out_put_spnego_key;
|
|
}
|
|
|
|
kfree_sensitive(ses->auth_key.response);
|
|
ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
|
|
GFP_KERNEL);
|
|
if (!ses->auth_key.response) {
|
|
cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory\n",
|
|
msg->sesskey_len);
|
|
rc = -ENOMEM;
|
|
goto out_put_spnego_key;
|
|
}
|
|
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);
|
|
sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
|
|
sess_data->iov[1].iov_len = msg->secblob_len;
|
|
pSMB->req.SecurityBlobLength = cpu_to_le16(sess_data->iov[1].iov_len);
|
|
|
|
if (ses->capabilities & CAP_UNICODE) {
|
|
/* unicode strings must be word aligned */
|
|
if (!IS_ALIGNED(sess_data->iov[0].iov_len + sess_data->iov[1].iov_len, 2)) {
|
|
*bcc_ptr = 0;
|
|
bcc_ptr++;
|
|
}
|
|
unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
|
|
unicode_domain_string(&bcc_ptr, ses, sess_data->nls_cp);
|
|
} else {
|
|
/* BB: is this right? */
|
|
ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
|
|
}
|
|
|
|
sess_data->iov[2].iov_len = (long) bcc_ptr -
|
|
(long) sess_data->iov[2].iov_base;
|
|
|
|
rc = sess_sendreceive(sess_data);
|
|
if (rc)
|
|
goto out_put_spnego_key;
|
|
|
|
pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
|
|
smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
|
|
|
|
if (smb_buf->WordCount != 4) {
|
|
rc = -EIO;
|
|
cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
|
|
goto out_put_spnego_key;
|
|
}
|
|
|
|
if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
|
|
cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
|
|
|
|
ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
|
|
cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
|
|
|
|
bytes_remaining = get_bcc(smb_buf);
|
|
bcc_ptr = pByteArea(smb_buf);
|
|
|
|
blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
|
|
if (blob_len > bytes_remaining) {
|
|
cifs_dbg(VFS, "bad security blob length %d\n",
|
|
blob_len);
|
|
rc = -EINVAL;
|
|
goto out_put_spnego_key;
|
|
}
|
|
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 (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) {
|
|
++bcc_ptr;
|
|
--bytes_remaining;
|
|
}
|
|
decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
|
|
sess_data->nls_cp);
|
|
} else {
|
|
decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
|
|
sess_data->nls_cp);
|
|
}
|
|
|
|
rc = sess_establish_session(sess_data);
|
|
out_put_spnego_key:
|
|
key_invalidate(spnego_key);
|
|
key_put(spnego_key);
|
|
out:
|
|
sess_data->result = rc;
|
|
sess_data->func = NULL;
|
|
sess_free_buffer(sess_data);
|
|
kfree_sensitive(ses->auth_key.response);
|
|
ses->auth_key.response = NULL;
|
|
}
|
|
|
|
#endif /* ! CONFIG_CIFS_UPCALL */
|
|
|
|
/*
|
|
* The required kvec buffers have to be allocated before calling this
|
|
* function.
|
|
*/
|
|
static int
|
|
_sess_auth_rawntlmssp_assemble_req(struct sess_data *sess_data)
|
|
{
|
|
SESSION_SETUP_ANDX *pSMB;
|
|
struct cifs_ses *ses = sess_data->ses;
|
|
struct TCP_Server_Info *server = sess_data->server;
|
|
__u32 capabilities;
|
|
char *bcc_ptr;
|
|
|
|
pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
|
|
|
|
capabilities = cifs_ssetup_hdr(ses, server, pSMB);
|
|
if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) {
|
|
cifs_dbg(VFS, "NTLMSSP requires Unicode support\n");
|
|
return -ENOSYS;
|
|
}
|
|
|
|
pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
|
|
capabilities |= CAP_EXTENDED_SECURITY;
|
|
pSMB->req.Capabilities |= cpu_to_le32(capabilities);
|
|
|
|
bcc_ptr = sess_data->iov[2].iov_base;
|
|
/* unicode strings must be word aligned */
|
|
if (!IS_ALIGNED(sess_data->iov[0].iov_len + sess_data->iov[1].iov_len, 2)) {
|
|
*bcc_ptr = 0;
|
|
bcc_ptr++;
|
|
}
|
|
unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
|
|
|
|
sess_data->iov[2].iov_len = (long) bcc_ptr -
|
|
(long) sess_data->iov[2].iov_base;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data);
|
|
|
|
static void
|
|
sess_auth_rawntlmssp_negotiate(struct sess_data *sess_data)
|
|
{
|
|
int rc;
|
|
struct smb_hdr *smb_buf;
|
|
SESSION_SETUP_ANDX *pSMB;
|
|
struct cifs_ses *ses = sess_data->ses;
|
|
struct TCP_Server_Info *server = sess_data->server;
|
|
__u16 bytes_remaining;
|
|
char *bcc_ptr;
|
|
unsigned char *ntlmsspblob = NULL;
|
|
u16 blob_len;
|
|
|
|
cifs_dbg(FYI, "rawntlmssp session setup negotiate phase\n");
|
|
|
|
/*
|
|
* if memory allocation is successful, caller of this function
|
|
* frees it.
|
|
*/
|
|
ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);
|
|
if (!ses->ntlmssp) {
|
|
rc = -ENOMEM;
|
|
goto out;
|
|
}
|
|
ses->ntlmssp->sesskey_per_smbsess = false;
|
|
|
|
/* wct = 12 */
|
|
rc = sess_alloc_buffer(sess_data, 12);
|
|
if (rc)
|
|
goto out;
|
|
|
|
pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
|
|
|
|
/* Build security blob before we assemble the request */
|
|
rc = build_ntlmssp_negotiate_blob(&ntlmsspblob,
|
|
&blob_len, ses, server,
|
|
sess_data->nls_cp);
|
|
if (rc)
|
|
goto out_free_ntlmsspblob;
|
|
|
|
sess_data->iov[1].iov_len = blob_len;
|
|
sess_data->iov[1].iov_base = ntlmsspblob;
|
|
pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);
|
|
|
|
rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
|
|
if (rc)
|
|
goto out_free_ntlmsspblob;
|
|
|
|
rc = sess_sendreceive(sess_data);
|
|
|
|
pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
|
|
smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
|
|
|
|
/* If true, rc here is expected and not an error */
|
|
if (sess_data->buf0_type != CIFS_NO_BUFFER &&
|
|
smb_buf->Status.CifsError ==
|
|
cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))
|
|
rc = 0;
|
|
|
|
if (rc)
|
|
goto out_free_ntlmsspblob;
|
|
|
|
cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");
|
|
|
|
if (smb_buf->WordCount != 4) {
|
|
rc = -EIO;
|
|
cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
|
|
goto out_free_ntlmsspblob;
|
|
}
|
|
|
|
ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
|
|
cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
|
|
|
|
bytes_remaining = get_bcc(smb_buf);
|
|
bcc_ptr = pByteArea(smb_buf);
|
|
|
|
blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
|
|
if (blob_len > bytes_remaining) {
|
|
cifs_dbg(VFS, "bad security blob length %d\n",
|
|
blob_len);
|
|
rc = -EINVAL;
|
|
goto out_free_ntlmsspblob;
|
|
}
|
|
|
|
rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses);
|
|
|
|
out_free_ntlmsspblob:
|
|
kfree_sensitive(ntlmsspblob);
|
|
out:
|
|
sess_free_buffer(sess_data);
|
|
|
|
if (!rc) {
|
|
sess_data->func = sess_auth_rawntlmssp_authenticate;
|
|
return;
|
|
}
|
|
|
|
/* Else error. Cleanup */
|
|
kfree_sensitive(ses->auth_key.response);
|
|
ses->auth_key.response = NULL;
|
|
kfree_sensitive(ses->ntlmssp);
|
|
ses->ntlmssp = NULL;
|
|
|
|
sess_data->func = NULL;
|
|
sess_data->result = rc;
|
|
}
|
|
|
|
static void
|
|
sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data)
|
|
{
|
|
int rc;
|
|
struct smb_hdr *smb_buf;
|
|
SESSION_SETUP_ANDX *pSMB;
|
|
struct cifs_ses *ses = sess_data->ses;
|
|
struct TCP_Server_Info *server = sess_data->server;
|
|
__u16 bytes_remaining;
|
|
char *bcc_ptr;
|
|
unsigned char *ntlmsspblob = NULL;
|
|
u16 blob_len;
|
|
|
|
cifs_dbg(FYI, "rawntlmssp session setup authenticate phase\n");
|
|
|
|
/* wct = 12 */
|
|
rc = sess_alloc_buffer(sess_data, 12);
|
|
if (rc)
|
|
goto out;
|
|
|
|
/* Build security blob before we assemble the request */
|
|
pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
|
|
smb_buf = (struct smb_hdr *)pSMB;
|
|
rc = build_ntlmssp_auth_blob(&ntlmsspblob,
|
|
&blob_len, ses, server,
|
|
sess_data->nls_cp);
|
|
if (rc)
|
|
goto out_free_ntlmsspblob;
|
|
sess_data->iov[1].iov_len = blob_len;
|
|
sess_data->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;
|
|
|
|
rc = _sess_auth_rawntlmssp_assemble_req(sess_data);
|
|
if (rc)
|
|
goto out_free_ntlmsspblob;
|
|
|
|
rc = sess_sendreceive(sess_data);
|
|
if (rc)
|
|
goto out_free_ntlmsspblob;
|
|
|
|
pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
|
|
smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
|
|
if (smb_buf->WordCount != 4) {
|
|
rc = -EIO;
|
|
cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
|
|
goto out_free_ntlmsspblob;
|
|
}
|
|
|
|
if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
|
|
cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
|
|
|
|
if (ses->Suid != smb_buf->Uid) {
|
|
ses->Suid = smb_buf->Uid;
|
|
cifs_dbg(FYI, "UID changed! new UID = %llu\n", ses->Suid);
|
|
}
|
|
|
|
bytes_remaining = get_bcc(smb_buf);
|
|
bcc_ptr = pByteArea(smb_buf);
|
|
blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
|
|
if (blob_len > bytes_remaining) {
|
|
cifs_dbg(VFS, "bad security blob length %d\n",
|
|
blob_len);
|
|
rc = -EINVAL;
|
|
goto out_free_ntlmsspblob;
|
|
}
|
|
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 (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) {
|
|
++bcc_ptr;
|
|
--bytes_remaining;
|
|
}
|
|
decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
|
|
sess_data->nls_cp);
|
|
} else {
|
|
decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
|
|
sess_data->nls_cp);
|
|
}
|
|
|
|
out_free_ntlmsspblob:
|
|
kfree_sensitive(ntlmsspblob);
|
|
out:
|
|
sess_free_buffer(sess_data);
|
|
|
|
if (!rc)
|
|
rc = sess_establish_session(sess_data);
|
|
|
|
/* Cleanup */
|
|
kfree_sensitive(ses->auth_key.response);
|
|
ses->auth_key.response = NULL;
|
|
kfree_sensitive(ses->ntlmssp);
|
|
ses->ntlmssp = NULL;
|
|
|
|
sess_data->func = NULL;
|
|
sess_data->result = rc;
|
|
}
|
|
|
|
static int select_sec(struct sess_data *sess_data)
|
|
{
|
|
int type;
|
|
struct cifs_ses *ses = sess_data->ses;
|
|
struct TCP_Server_Info *server = sess_data->server;
|
|
|
|
type = cifs_select_sectype(server, ses->sectype);
|
|
cifs_dbg(FYI, "sess setup type %d\n", type);
|
|
if (type == Unspecified) {
|
|
cifs_dbg(VFS, "Unable to select appropriate authentication method!\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
switch (type) {
|
|
case NTLMv2:
|
|
sess_data->func = sess_auth_ntlmv2;
|
|
break;
|
|
case Kerberos:
|
|
#ifdef CONFIG_CIFS_UPCALL
|
|
sess_data->func = sess_auth_kerberos;
|
|
break;
|
|
#else
|
|
cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
|
|
return -ENOSYS;
|
|
#endif /* CONFIG_CIFS_UPCALL */
|
|
case RawNTLMSSP:
|
|
sess_data->func = sess_auth_rawntlmssp_negotiate;
|
|
break;
|
|
default:
|
|
cifs_dbg(VFS, "secType %d not supported!\n", type);
|
|
return -ENOSYS;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses,
|
|
struct TCP_Server_Info *server,
|
|
const struct nls_table *nls_cp)
|
|
{
|
|
int rc = 0;
|
|
struct sess_data *sess_data;
|
|
|
|
if (ses == NULL) {
|
|
WARN(1, "%s: ses == NULL!", __func__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
sess_data = kzalloc(sizeof(struct sess_data), GFP_KERNEL);
|
|
if (!sess_data)
|
|
return -ENOMEM;
|
|
|
|
sess_data->xid = xid;
|
|
sess_data->ses = ses;
|
|
sess_data->server = server;
|
|
sess_data->buf0_type = CIFS_NO_BUFFER;
|
|
sess_data->nls_cp = (struct nls_table *) nls_cp;
|
|
|
|
rc = select_sec(sess_data);
|
|
if (rc)
|
|
goto out;
|
|
|
|
while (sess_data->func)
|
|
sess_data->func(sess_data);
|
|
|
|
/* Store result before we free sess_data */
|
|
rc = sess_data->result;
|
|
|
|
out:
|
|
kfree_sensitive(sess_data);
|
|
return rc;
|
|
}
|
|
#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */
|