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sess.c
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sess.c
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// SPDX-License-Identifier: LGPL-2.1
/*
*
* SMB/CIFS session setup handling routines
*
* Copyright (c) International Business Machines Corp., 2006, 2009
* Author(s): Steve French (sfrench@us.ibm.com)
*
*/
#include "cifspdu.h"
#include "cifsglob.h"
#include "cifsproto.h"
#include "cifs_unicode.h"
#include "cifs_debug.h"
#include "ntlmssp.h"
#include "nterr.h"
#include <linux/utsname.h>
#include <linux/slab.h>
#include <linux/version.h>
#include "cifsfs.h"
#include "cifs_spnego.h"
#include "smb2proto.h"
#include "fs_context.h"
static int
cifs_ses_add_channel(struct cifs_ses *ses,
struct cifs_server_iface *iface);
bool
is_server_using_iface(struct TCP_Server_Info *server,
struct cifs_server_iface *iface)
{
struct sockaddr_in *i4 = (struct sockaddr_in *)&iface->sockaddr;
struct sockaddr_in6 *i6 = (struct sockaddr_in6 *)&iface->sockaddr;
struct sockaddr_in *s4 = (struct sockaddr_in *)&server->dstaddr;
struct sockaddr_in6 *s6 = (struct sockaddr_in6 *)&server->dstaddr;
if (server->dstaddr.ss_family != iface->sockaddr.ss_family)
return false;
if (server->dstaddr.ss_family == AF_INET) {
if (s4->sin_addr.s_addr != i4->sin_addr.s_addr)
return false;
} else if (server->dstaddr.ss_family == AF_INET6) {
if (memcmp(&s6->sin6_addr, &i6->sin6_addr,
sizeof(i6->sin6_addr)) != 0)
return false;
} else {
/* unknown family.. */
return false;
}
return true;
}
bool is_ses_using_iface(struct cifs_ses *ses, struct cifs_server_iface *iface)
{
int i;
spin_lock(&ses->chan_lock);
for (i = 0; i < ses->chan_count; i++) {
if (ses->chans[i].iface == iface) {
spin_unlock(&ses->chan_lock);
return true;
}
}
spin_unlock(&ses->chan_lock);
return false;
}
/* channel helper functions. assumed that chan_lock is held by caller. */
int
cifs_ses_get_chan_index(struct cifs_ses *ses,
struct TCP_Server_Info *server)
{
unsigned int i;
/* if the channel is waiting for termination */
if (server && server->terminate)
return CIFS_INVAL_CHAN_INDEX;
for (i = 0; i < ses->chan_count; i++) {
if (ses->chans[i].server == server)
return i;
}
/* If we didn't find the channel, it is likely a bug */
if (server)
cifs_dbg(VFS, "unable to get chan index for server: 0x%llx",
server->conn_id);
return CIFS_INVAL_CHAN_INDEX;
}
void
cifs_chan_set_in_reconnect(struct cifs_ses *ses,
struct TCP_Server_Info *server)
{
int chan_index = cifs_ses_get_chan_index(ses, server);
if (chan_index == CIFS_INVAL_CHAN_INDEX)
return;
ses->chans[chan_index].in_reconnect = true;
}
void
cifs_chan_clear_in_reconnect(struct cifs_ses *ses,
struct TCP_Server_Info *server)
{
unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
if (chan_index == CIFS_INVAL_CHAN_INDEX)
return;
ses->chans[chan_index].in_reconnect = false;
}
bool
cifs_chan_in_reconnect(struct cifs_ses *ses,
struct TCP_Server_Info *server)
{
unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
if (chan_index == CIFS_INVAL_CHAN_INDEX)
return true; /* err on the safer side */
return CIFS_CHAN_IN_RECONNECT(ses, chan_index);
}
void
cifs_chan_set_need_reconnect(struct cifs_ses *ses,
struct TCP_Server_Info *server)
{
unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
if (chan_index == CIFS_INVAL_CHAN_INDEX)
return;
set_bit(chan_index, &ses->chans_need_reconnect);
cifs_dbg(FYI, "Set reconnect bitmask for chan %u; now 0x%lx\n",
chan_index, ses->chans_need_reconnect);
}
void
cifs_chan_clear_need_reconnect(struct cifs_ses *ses,
struct TCP_Server_Info *server)
{
unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
if (chan_index == CIFS_INVAL_CHAN_INDEX)
return;
clear_bit(chan_index, &ses->chans_need_reconnect);
cifs_dbg(FYI, "Cleared reconnect bitmask for chan %u; now 0x%lx\n",
chan_index, ses->chans_need_reconnect);
}
bool
cifs_chan_needs_reconnect(struct cifs_ses *ses,
struct TCP_Server_Info *server)
{
unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
if (chan_index == CIFS_INVAL_CHAN_INDEX)
return true; /* err on the safer side */
return CIFS_CHAN_NEEDS_RECONNECT(ses, chan_index);
}
bool
cifs_chan_is_iface_active(struct cifs_ses *ses,
struct TCP_Server_Info *server)
{
unsigned int chan_index = cifs_ses_get_chan_index(ses, server);
if (chan_index == CIFS_INVAL_CHAN_INDEX)
return true; /* err on the safer side */
return ses->chans[chan_index].iface &&
ses->chans[chan_index].iface->is_active;
}
/* returns number of channels added */
int cifs_try_adding_channels(struct cifs_ses *ses)
{
struct TCP_Server_Info *server = ses->server;
int old_chan_count, new_chan_count;
int left;
int rc = 0;
int tries = 0;
size_t iface_weight = 0, iface_min_speed = 0;
struct cifs_server_iface *iface = NULL, *niface = NULL;
struct cifs_server_iface *last_iface = NULL;
spin_lock(&ses->chan_lock);
new_chan_count = old_chan_count = ses->chan_count;
left = ses->chan_max - ses->chan_count;
if (left <= 0) {
spin_unlock(&ses->chan_lock);
cifs_dbg(FYI,
"ses already at max_channels (%zu), nothing to open\n",
ses->chan_max);
return 0;
}
if (server->dialect < SMB30_PROT_ID) {
spin_unlock(&ses->chan_lock);
cifs_dbg(VFS, "multichannel is not supported on this protocol version, use 3.0 or above\n");
return 0;
}
if (!(server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL)) {
spin_unlock(&ses->chan_lock);
cifs_server_dbg(VFS, "no multichannel support\n");
return 0;
}
spin_unlock(&ses->chan_lock);
while (left > 0) {
tries++;
if (tries > 3*ses->chan_max) {
cifs_dbg(VFS, "too many channel open attempts (%d channels left to open)\n",
left);
break;
}
spin_lock(&ses->iface_lock);
if (!ses->iface_count) {
spin_unlock(&ses->iface_lock);
cifs_dbg(ONCE, "server %s does not advertise interfaces\n",
ses->server->hostname);
break;
}
if (!iface)
iface = list_first_entry(&ses->iface_list, struct cifs_server_iface,
iface_head);
last_iface = list_last_entry(&ses->iface_list, struct cifs_server_iface,
iface_head);
iface_min_speed = last_iface->speed;
list_for_each_entry_safe_from(iface, niface, &ses->iface_list,
iface_head) {
/* do not mix rdma and non-rdma interfaces */
if (iface->rdma_capable != ses->server->rdma)
continue;
/* skip ifaces that are unusable */
if (!iface->is_active ||
(is_ses_using_iface(ses, iface) &&
!iface->rss_capable))
continue;
/* check if we already allocated enough channels */
iface_weight = iface->speed / iface_min_speed;
if (iface->weight_fulfilled >= iface_weight)
continue;
/* take ref before unlock */
kref_get(&iface->refcount);
spin_unlock(&ses->iface_lock);
rc = cifs_ses_add_channel(ses, iface);
spin_lock(&ses->iface_lock);
if (rc) {
cifs_dbg(VFS, "failed to open extra channel on iface:%pIS rc=%d\n",
&iface->sockaddr,
rc);
kref_put(&iface->refcount, release_iface);
/* failure to add chan should increase weight */
iface->weight_fulfilled++;
continue;
}
iface->num_channels++;
iface->weight_fulfilled++;
cifs_dbg(VFS, "successfully opened new channel on iface:%pIS\n",
&iface->sockaddr);
break;
}
/* reached end of list. reset weight_fulfilled and start over */
if (list_entry_is_head(iface, &ses->iface_list, iface_head)) {
list_for_each_entry(iface, &ses->iface_list, iface_head)
iface->weight_fulfilled = 0;
spin_unlock(&ses->iface_lock);
iface = NULL;
continue;
}
spin_unlock(&ses->iface_lock);
left--;
new_chan_count++;
}
return new_chan_count - old_chan_count;
}
/*
* called when multichannel is disabled by the server.
* this always gets called from smb2_reconnect
* and cannot get called in parallel threads.
*/
void
cifs_disable_secondary_channels(struct cifs_ses *ses)
{
int i, chan_count;
struct TCP_Server_Info *server;
struct cifs_server_iface *iface;
spin_lock(&ses->chan_lock);
chan_count = ses->chan_count;
if (chan_count == 1)
goto done;
ses->chan_count = 1;
/* for all secondary channels reset the need reconnect bit */
ses->chans_need_reconnect &= 1;
for (i = 1; i < chan_count; i++) {
iface = ses->chans[i].iface;
server = ses->chans[i].server;
/*
* remove these references first, since we need to unlock
* the chan_lock here, since iface_lock is a higher lock
*/
ses->chans[i].iface = NULL;
ses->chans[i].server = NULL;
spin_unlock(&ses->chan_lock);
if (iface) {
spin_lock(&ses->iface_lock);
iface->num_channels--;
if (iface->weight_fulfilled)
iface->weight_fulfilled--;
kref_put(&iface->refcount, release_iface);
spin_unlock(&ses->iface_lock);
}
if (server) {
if (!server->terminate) {
server->terminate = true;
cifs_signal_cifsd_for_reconnect(server, false);
}
cifs_put_tcp_session(server, false);
}
spin_lock(&ses->chan_lock);
}
done:
spin_unlock(&ses->chan_lock);
}
/*
* update the iface for the channel if necessary.
* Must be called with chan_lock held.
*/
void
cifs_chan_update_iface(struct cifs_ses *ses, struct TCP_Server_Info *server)
{
unsigned int chan_index;
size_t iface_weight = 0, iface_min_speed = 0;
struct cifs_server_iface *iface = NULL;
struct cifs_server_iface *old_iface = NULL;
struct cifs_server_iface *last_iface = NULL;
struct sockaddr_storage ss;
spin_lock(&ses->chan_lock);
chan_index = cifs_ses_get_chan_index(ses, server);
if (chan_index == CIFS_INVAL_CHAN_INDEX) {
spin_unlock(&ses->chan_lock);
return;
}
if (ses->chans[chan_index].iface) {
old_iface = ses->chans[chan_index].iface;
if (old_iface->is_active) {
spin_unlock(&ses->chan_lock);
return;
}
}
spin_unlock(&ses->chan_lock);
spin_lock(&server->srv_lock);
ss = server->dstaddr;
spin_unlock(&server->srv_lock);
spin_lock(&ses->iface_lock);
if (!ses->iface_count) {
spin_unlock(&ses->iface_lock);
cifs_dbg(ONCE, "server %s does not advertise interfaces\n", ses->server->hostname);
return;
}
last_iface = list_last_entry(&ses->iface_list, struct cifs_server_iface,
iface_head);
iface_min_speed = last_iface->speed;
/* then look for a new one */
list_for_each_entry(iface, &ses->iface_list, iface_head) {
if (!chan_index) {
/* if we're trying to get the updated iface for primary channel */
if (!cifs_match_ipaddr((struct sockaddr *) &ss,
(struct sockaddr *) &iface->sockaddr))
continue;
kref_get(&iface->refcount);
break;
}
/* do not mix rdma and non-rdma interfaces */
if (iface->rdma_capable != server->rdma)
continue;
if (!iface->is_active ||
(is_ses_using_iface(ses, iface) &&
!iface->rss_capable)) {
continue;
}
/* check if we already allocated enough channels */
iface_weight = iface->speed / iface_min_speed;
if (iface->weight_fulfilled >= iface_weight)
continue;
kref_get(&iface->refcount);
break;
}
if (list_entry_is_head(iface, &ses->iface_list, iface_head)) {
iface = NULL;
cifs_dbg(FYI, "unable to find a suitable iface\n");
}
if (!iface) {
if (!chan_index)
cifs_dbg(FYI, "unable to get the interface matching: %pIS\n",
&ss);
else {
cifs_dbg(FYI, "unable to find another interface to replace: %pIS\n",
&old_iface->sockaddr);
}
spin_unlock(&ses->iface_lock);
return;
}
/* now drop the ref to the current iface */
if (old_iface) {
cifs_dbg(FYI, "replacing iface: %pIS with %pIS\n",
&old_iface->sockaddr,
&iface->sockaddr);
old_iface->num_channels--;
if (old_iface->weight_fulfilled)
old_iface->weight_fulfilled--;
iface->num_channels++;
iface->weight_fulfilled++;
kref_put(&old_iface->refcount, release_iface);
} else if (!chan_index) {
/* special case: update interface for primary channel */
cifs_dbg(FYI, "referencing primary channel iface: %pIS\n",
&iface->sockaddr);
iface->num_channels++;
iface->weight_fulfilled++;
}
spin_unlock(&ses->iface_lock);
spin_lock(&ses->chan_lock);
chan_index = cifs_ses_get_chan_index(ses, server);
if (chan_index == CIFS_INVAL_CHAN_INDEX) {
spin_unlock(&ses->chan_lock);
return;
}
ses->chans[chan_index].iface = iface;
spin_unlock(&ses->chan_lock);
}
/*
* If server is a channel of ses, return the corresponding enclosing
* cifs_chan otherwise return NULL.
*/
struct cifs_chan *
cifs_ses_find_chan(struct cifs_ses *ses, struct TCP_Server_Info *server)
{
int i;
spin_lock(&ses->chan_lock);
for (i = 0; i < ses->chan_count; i++) {
if (ses->chans[i].server == server) {
spin_unlock(&ses->chan_lock);
return &ses->chans[i];
}
}
spin_unlock(&ses->chan_lock);
return NULL;
}
static int
cifs_ses_add_channel(struct cifs_ses *ses,
struct cifs_server_iface *iface)
{
struct TCP_Server_Info *chan_server;
struct cifs_chan *chan;
struct smb3_fs_context *ctx;
static const char unc_fmt[] = "\\%s\\foo";
struct sockaddr_in *ipv4 = (struct sockaddr_in *)&iface->sockaddr;
struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)&iface->sockaddr;
size_t len;
int rc;
unsigned int xid = get_xid();
if (iface->sockaddr.ss_family == AF_INET)
cifs_dbg(FYI, "adding channel to ses %p (speed:%zu bps rdma:%s ip:%pI4)\n",
ses, iface->speed, iface->rdma_capable ? "yes" : "no",
&ipv4->sin_addr);
else
cifs_dbg(FYI, "adding channel to ses %p (speed:%zu bps rdma:%s ip:%pI6)\n",
ses, iface->speed, iface->rdma_capable ? "yes" : "no",
&ipv6->sin6_addr);
/*
* Setup a ctx with mostly the same info as the existing
* session and overwrite it with the requested iface data.
*
* We need to setup at least the fields used for negprot and
* sesssetup.
*
* We only need the ctx here, so we can reuse memory from
* the session and server without caring about memory
* management.
*/
ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
if (!ctx) {
rc = -ENOMEM;
goto out_free_xid;
}
/* Always make new connection for now (TODO?) */
ctx->nosharesock = true;
/* Auth */
ctx->domainauto = ses->domainAuto;
ctx->domainname = ses->domainName;
/* no hostname for extra channels */
ctx->server_hostname = "";
ctx->username = ses->user_name;
ctx->password = ses->password;
ctx->sectype = ses->sectype;
ctx->sign = ses->sign;
/* UNC and paths */
/* XXX: Use ses->server->hostname? */
len = sizeof(unc_fmt) + SERVER_NAME_LEN_WITH_NULL;
ctx->UNC = kzalloc(len, GFP_KERNEL);
if (!ctx->UNC) {
rc = -ENOMEM;
goto out_free_ctx;
}
scnprintf(ctx->UNC, len, unc_fmt, ses->ip_addr);
ctx->prepath = "";
/* Reuse same version as master connection */
ctx->vals = ses->server->vals;
ctx->ops = ses->server->ops;
ctx->noblocksnd = ses->server->noblocksnd;
ctx->noautotune = ses->server->noautotune;
ctx->sockopt_tcp_nodelay = ses->server->tcp_nodelay;
ctx->echo_interval = ses->server->echo_interval / HZ;
ctx->max_credits = ses->server->max_credits;
/*
* This will be used for encoding/decoding user/domain/pw
* during sess setup auth.
*/
ctx->local_nls = ses->local_nls;
/* Use RDMA if possible */
ctx->rdma = iface->rdma_capable;
memcpy(&ctx->dstaddr, &iface->sockaddr, sizeof(ctx->dstaddr));
/* reuse master con client guid */
memcpy(&ctx->client_guid, ses->server->client_guid,
sizeof(ctx->client_guid));
ctx->use_client_guid = true;
chan_server = cifs_get_tcp_session(ctx, ses->server);
spin_lock(&ses->chan_lock);
chan = &ses->chans[ses->chan_count];
chan->server = chan_server;
if (IS_ERR(chan->server)) {
rc = PTR_ERR(chan->server);
chan->server = NULL;
spin_unlock(&ses->chan_lock);
goto out;
}
chan->iface = iface;
ses->chan_count++;
atomic_set(&ses->chan_seq, 0);
/* Mark this channel as needing connect/setup */
cifs_chan_set_need_reconnect(ses, chan->server);
spin_unlock(&ses->chan_lock);
mutex_lock(&ses->session_mutex);
/*
* We need to allocate the server crypto now as we will need
* to sign packets before we generate the channel signing key
* (we sign with the session key)
*/
rc = smb311_crypto_shash_allocate(chan->server);
if (rc) {
cifs_dbg(VFS, "%s: crypto alloc failed\n", __func__);
mutex_unlock(&ses->session_mutex);
goto out;
}
rc = cifs_negotiate_protocol(xid, ses, chan->server);
if (!rc)
rc = cifs_setup_session(xid, ses, chan->server, ses->local_nls);
mutex_unlock(&ses->session_mutex);
out:
if (rc && chan->server) {
cifs_put_tcp_session(chan->server, 0);
spin_lock(&ses->chan_lock);
/* we rely on all bits beyond chan_count to be clear */
cifs_chan_clear_need_reconnect(ses, chan->server);
ses->chan_count--;
/*
* 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);
}
kfree(ctx->UNC);
out_free_ctx:
kfree(ctx);
out_free_xid:
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 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 less than 335 or will need to send 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 send a null domain name so 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;