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1// SPDX-License-Identifier: LGPL-2.12/*3 *4 * SMB/CIFS session setup handling routines5 *6 * Copyright (c) International Business Machines Corp., 2006, 20097 * Author(s): Steve French (sfrench@us.ibm.com)8 *9 */10 11#include "cifspdu.h"12#include "cifsglob.h"13#include "cifsproto.h"14#include "cifs_unicode.h"15#include "cifs_debug.h"16#include "ntlmssp.h"17#include "nterr.h"18#include <linux/utsname.h>19#include <linux/slab.h>20#include <linux/version.h>21#include "cifsfs.h"22#include "cifs_spnego.h"23#include "smb2proto.h"24#include "fs_context.h"25 26static int27cifs_ses_add_channel(struct cifs_ses *ses,28 struct cifs_server_iface *iface);29 30bool31is_server_using_iface(struct TCP_Server_Info *server,32 struct cifs_server_iface *iface)33{34 struct sockaddr_in *i4 = (struct sockaddr_in *)&iface->sockaddr;35 struct sockaddr_in6 *i6 = (struct sockaddr_in6 *)&iface->sockaddr;36 struct sockaddr_in *s4 = (struct sockaddr_in *)&server->dstaddr;37 struct sockaddr_in6 *s6 = (struct sockaddr_in6 *)&server->dstaddr;38 39 if (server->dstaddr.ss_family != iface->sockaddr.ss_family)40 return false;41 if (server->dstaddr.ss_family == AF_INET) {42 if (s4->sin_addr.s_addr != i4->sin_addr.s_addr)43 return false;44 } else if (server->dstaddr.ss_family == AF_INET6) {45 if (memcmp(&s6->sin6_addr, &i6->sin6_addr,46 sizeof(i6->sin6_addr)) != 0)47 return false;48 } else {49 /* unknown family.. */50 return false;51 }52 return true;53}54 55bool is_ses_using_iface(struct cifs_ses *ses, struct cifs_server_iface *iface)56{57 int i;58 59 spin_lock(&ses->chan_lock);60 for (i = 0; i < ses->chan_count; i++) {61 if (ses->chans[i].iface == iface) {62 spin_unlock(&ses->chan_lock);63 return true;64 }65 }66 spin_unlock(&ses->chan_lock);67 return false;68}69 70/* channel helper functions. assumed that chan_lock is held by caller. */71 72int73cifs_ses_get_chan_index(struct cifs_ses *ses,74 struct TCP_Server_Info *server)75{76 unsigned int i;77 78 /* if the channel is waiting for termination */79 if (server && server->terminate)80 return CIFS_INVAL_CHAN_INDEX;81 82 for (i = 0; i < ses->chan_count; i++) {83 if (ses->chans[i].server == server)84 return i;85 }86 87 /* If we didn't find the channel, it is likely a bug */88 if (server)89 cifs_dbg(VFS, "unable to get chan index for server: 0x%llx",90 server->conn_id);91 return CIFS_INVAL_CHAN_INDEX;92}93 94void95cifs_chan_set_in_reconnect(struct cifs_ses *ses,96 struct TCP_Server_Info *server)97{98 int chan_index = cifs_ses_get_chan_index(ses, server);99 100 if (chan_index == CIFS_INVAL_CHAN_INDEX)101 return;102 103 ses->chans[chan_index].in_reconnect = true;104}105 106void107cifs_chan_clear_in_reconnect(struct cifs_ses *ses,108 struct TCP_Server_Info *server)109{110 unsigned int chan_index = cifs_ses_get_chan_index(ses, server);111 112 if (chan_index == CIFS_INVAL_CHAN_INDEX)113 return;114 115 ses->chans[chan_index].in_reconnect = false;116}117 118void119cifs_chan_set_need_reconnect(struct cifs_ses *ses,120 struct TCP_Server_Info *server)121{122 unsigned int chan_index = cifs_ses_get_chan_index(ses, server);123 124 if (chan_index == CIFS_INVAL_CHAN_INDEX)125 return;126 127 set_bit(chan_index, &ses->chans_need_reconnect);128 cifs_dbg(FYI, "Set reconnect bitmask for chan %u; now 0x%lx\n",129 chan_index, ses->chans_need_reconnect);130}131 132void133cifs_chan_clear_need_reconnect(struct cifs_ses *ses,134 struct TCP_Server_Info *server)135{136 unsigned int chan_index = cifs_ses_get_chan_index(ses, server);137 138 if (chan_index == CIFS_INVAL_CHAN_INDEX)139 return;140 141 clear_bit(chan_index, &ses->chans_need_reconnect);142 cifs_dbg(FYI, "Cleared reconnect bitmask for chan %u; now 0x%lx\n",143 chan_index, ses->chans_need_reconnect);144}145 146bool147cifs_chan_needs_reconnect(struct cifs_ses *ses,148 struct TCP_Server_Info *server)149{150 unsigned int chan_index = cifs_ses_get_chan_index(ses, server);151 152 if (chan_index == CIFS_INVAL_CHAN_INDEX)153 return true; /* err on the safer side */154 155 return CIFS_CHAN_NEEDS_RECONNECT(ses, chan_index);156}157 158bool159cifs_chan_is_iface_active(struct cifs_ses *ses,160 struct TCP_Server_Info *server)161{162 unsigned int chan_index = cifs_ses_get_chan_index(ses, server);163 164 if (chan_index == CIFS_INVAL_CHAN_INDEX)165 return true; /* err on the safer side */166 167 return ses->chans[chan_index].iface &&168 ses->chans[chan_index].iface->is_active;169}170 171/* returns number of channels added */172int cifs_try_adding_channels(struct cifs_ses *ses)173{174 struct TCP_Server_Info *server = ses->server;175 int old_chan_count, new_chan_count;176 int left;177 int rc = 0;178 int tries = 0;179 size_t iface_weight = 0, iface_min_speed = 0;180 struct cifs_server_iface *iface = NULL, *niface = NULL;181 struct cifs_server_iface *last_iface = NULL;182 183 spin_lock(&ses->chan_lock);184 185 new_chan_count = old_chan_count = ses->chan_count;186 left = ses->chan_max - ses->chan_count;187 188 if (left <= 0) {189 spin_unlock(&ses->chan_lock);190 cifs_dbg(FYI,191 "ses already at max_channels (%zu), nothing to open\n",192 ses->chan_max);193 return 0;194 }195 196 if (server->dialect < SMB30_PROT_ID) {197 spin_unlock(&ses->chan_lock);198 cifs_dbg(VFS, "multichannel is not supported on this protocol version, use 3.0 or above\n");199 return 0;200 }201 202 if (!(server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL)) {203 spin_unlock(&ses->chan_lock);204 cifs_server_dbg(VFS, "no multichannel support\n");205 return 0;206 }207 spin_unlock(&ses->chan_lock);208 209 while (left > 0) {210 211 tries++;212 if (tries > 3*ses->chan_max) {213 cifs_dbg(VFS, "too many channel open attempts (%d channels left to open)\n",214 left);215 break;216 }217 218 spin_lock(&ses->iface_lock);219 if (!ses->iface_count) {220 spin_unlock(&ses->iface_lock);221 cifs_dbg(ONCE, "server %s does not advertise interfaces\n",222 ses->server->hostname);223 break;224 }225 226 if (!iface)227 iface = list_first_entry(&ses->iface_list, struct cifs_server_iface,228 iface_head);229 last_iface = list_last_entry(&ses->iface_list, struct cifs_server_iface,230 iface_head);231 iface_min_speed = last_iface->speed;232 233 list_for_each_entry_safe_from(iface, niface, &ses->iface_list,234 iface_head) {235 /* do not mix rdma and non-rdma interfaces */236 if (iface->rdma_capable != ses->server->rdma)237 continue;238 239 /* skip ifaces that are unusable */240 if (!iface->is_active ||241 (is_ses_using_iface(ses, iface) &&242 !iface->rss_capable))243 continue;244 245 /* check if we already allocated enough channels */246 iface_weight = iface->speed / iface_min_speed;247 248 if (iface->weight_fulfilled >= iface_weight)249 continue;250 251 /* take ref before unlock */252 kref_get(&iface->refcount);253 254 spin_unlock(&ses->iface_lock);255 rc = cifs_ses_add_channel(ses, iface);256 spin_lock(&ses->iface_lock);257 258 if (rc) {259 cifs_dbg(VFS, "failed to open extra channel on iface:%pIS rc=%d\n",260 &iface->sockaddr,261 rc);262 kref_put(&iface->refcount, release_iface);263 /* failure to add chan should increase weight */264 iface->weight_fulfilled++;265 continue;266 }267 268 iface->num_channels++;269 iface->weight_fulfilled++;270 cifs_dbg(VFS, "successfully opened new channel on iface:%pIS\n",271 &iface->sockaddr);272 break;273 }274 275 /* reached end of list. reset weight_fulfilled and start over */276 if (list_entry_is_head(iface, &ses->iface_list, iface_head)) {277 list_for_each_entry(iface, &ses->iface_list, iface_head)278 iface->weight_fulfilled = 0;279 spin_unlock(&ses->iface_lock);280 iface = NULL;281 continue;282 }283 spin_unlock(&ses->iface_lock);284 285 left--;286 new_chan_count++;287 }288 289 return new_chan_count - old_chan_count;290}291 292/*293 * called when multichannel is disabled by the server.294 * this always gets called from smb2_reconnect295 * and cannot get called in parallel threads.296 */297void298cifs_disable_secondary_channels(struct cifs_ses *ses)299{300 int i, chan_count;301 struct TCP_Server_Info *server;302 struct cifs_server_iface *iface;303 304 spin_lock(&ses->chan_lock);305 chan_count = ses->chan_count;306 if (chan_count == 1)307 goto done;308 309 ses->chan_count = 1;310 311 /* for all secondary channels reset the need reconnect bit */312 ses->chans_need_reconnect &= 1;313 314 for (i = 1; i < chan_count; i++) {315 iface = ses->chans[i].iface;316 server = ses->chans[i].server;317 318 /*319 * remove these references first, since we need to unlock320 * the chan_lock here, since iface_lock is a higher lock321 */322 ses->chans[i].iface = NULL;323 ses->chans[i].server = NULL;324 spin_unlock(&ses->chan_lock);325 326 if (iface) {327 spin_lock(&ses->iface_lock);328 iface->num_channels--;329 if (iface->weight_fulfilled)330 iface->weight_fulfilled--;331 kref_put(&iface->refcount, release_iface);332 spin_unlock(&ses->iface_lock);333 }334 335 if (server) {336 if (!server->terminate) {337 server->terminate = true;338 cifs_signal_cifsd_for_reconnect(server, false);339 }340 cifs_put_tcp_session(server, false);341 }342 343 spin_lock(&ses->chan_lock);344 }345 346done:347 spin_unlock(&ses->chan_lock);348}349 350/*351 * update the iface for the channel if necessary.352 * Must be called with chan_lock held.353 */354void355cifs_chan_update_iface(struct cifs_ses *ses, struct TCP_Server_Info *server)356{357 unsigned int chan_index;358 size_t iface_weight = 0, iface_min_speed = 0;359 struct cifs_server_iface *iface = NULL;360 struct cifs_server_iface *old_iface = NULL;361 struct cifs_server_iface *last_iface = NULL;362 struct sockaddr_storage ss;363 364 spin_lock(&ses->chan_lock);365 chan_index = cifs_ses_get_chan_index(ses, server);366 if (chan_index == CIFS_INVAL_CHAN_INDEX) {367 spin_unlock(&ses->chan_lock);368 return;369 }370 371 if (ses->chans[chan_index].iface) {372 old_iface = ses->chans[chan_index].iface;373 if (old_iface->is_active) {374 spin_unlock(&ses->chan_lock);375 return;376 }377 }378 spin_unlock(&ses->chan_lock);379 380 spin_lock(&server->srv_lock);381 ss = server->dstaddr;382 spin_unlock(&server->srv_lock);383 384 spin_lock(&ses->iface_lock);385 if (!ses->iface_count) {386 spin_unlock(&ses->iface_lock);387 cifs_dbg(ONCE, "server %s does not advertise interfaces\n", ses->server->hostname);388 return;389 }390 391 last_iface = list_last_entry(&ses->iface_list, struct cifs_server_iface,392 iface_head);393 iface_min_speed = last_iface->speed;394 395 /* then look for a new one */396 list_for_each_entry(iface, &ses->iface_list, iface_head) {397 if (!chan_index) {398 /* if we're trying to get the updated iface for primary channel */399 if (!cifs_match_ipaddr((struct sockaddr *) &ss,400 (struct sockaddr *) &iface->sockaddr))401 continue;402 403 kref_get(&iface->refcount);404 break;405 }406 407 /* do not mix rdma and non-rdma interfaces */408 if (iface->rdma_capable != server->rdma)409 continue;410 411 if (!iface->is_active ||412 (is_ses_using_iface(ses, iface) &&413 !iface->rss_capable)) {414 continue;415 }416 417 /* check if we already allocated enough channels */418 iface_weight = iface->speed / iface_min_speed;419 420 if (iface->weight_fulfilled >= iface_weight)421 continue;422 423 kref_get(&iface->refcount);424 break;425 }426 427 if (list_entry_is_head(iface, &ses->iface_list, iface_head)) {428 iface = NULL;429 cifs_dbg(FYI, "unable to find a suitable iface\n");430 }431 432 if (!iface) {433 if (!chan_index)434 cifs_dbg(FYI, "unable to get the interface matching: %pIS\n",435 &ss);436 else {437 cifs_dbg(FYI, "unable to find another interface to replace: %pIS\n",438 &old_iface->sockaddr);439 }440 441 spin_unlock(&ses->iface_lock);442 return;443 }444 445 /* now drop the ref to the current iface */446 if (old_iface) {447 cifs_dbg(FYI, "replacing iface: %pIS with %pIS\n",448 &old_iface->sockaddr,449 &iface->sockaddr);450 451 old_iface->num_channels--;452 if (old_iface->weight_fulfilled)453 old_iface->weight_fulfilled--;454 iface->num_channels++;455 iface->weight_fulfilled++;456 457 kref_put(&old_iface->refcount, release_iface);458 } else if (!chan_index) {459 /* special case: update interface for primary channel */460 cifs_dbg(FYI, "referencing primary channel iface: %pIS\n",461 &iface->sockaddr);462 iface->num_channels++;463 iface->weight_fulfilled++;464 }465 spin_unlock(&ses->iface_lock);466 467 spin_lock(&ses->chan_lock);468 chan_index = cifs_ses_get_chan_index(ses, server);469 if (chan_index == CIFS_INVAL_CHAN_INDEX) {470 spin_unlock(&ses->chan_lock);471 return;472 }473 474 ses->chans[chan_index].iface = iface;475 spin_unlock(&ses->chan_lock);476}477 478static int479cifs_ses_add_channel(struct cifs_ses *ses,480 struct cifs_server_iface *iface)481{482 struct TCP_Server_Info *chan_server;483 struct cifs_chan *chan;484 struct smb3_fs_context *ctx;485 static const char unc_fmt[] = "\\%s\\foo";486 struct sockaddr_in *ipv4 = (struct sockaddr_in *)&iface->sockaddr;487 struct sockaddr_in6 *ipv6 = (struct sockaddr_in6 *)&iface->sockaddr;488 size_t len;489 int rc;490 unsigned int xid = get_xid();491 492 if (iface->sockaddr.ss_family == AF_INET)493 cifs_dbg(FYI, "adding channel to ses %p (speed:%zu bps rdma:%s ip:%pI4)\n",494 ses, iface->speed, iface->rdma_capable ? "yes" : "no",495 &ipv4->sin_addr);496 else497 cifs_dbg(FYI, "adding channel to ses %p (speed:%zu bps rdma:%s ip:%pI6)\n",498 ses, iface->speed, iface->rdma_capable ? "yes" : "no",499 &ipv6->sin6_addr);500 501 /*502 * Setup a ctx with mostly the same info as the existing503 * session and overwrite it with the requested iface data.504 *505 * We need to setup at least the fields used for negprot and506 * sesssetup.507 *508 * We only need the ctx here, so we can reuse memory from509 * the session and server without caring about memory510 * management.511 */512 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);513 if (!ctx) {514 rc = -ENOMEM;515 goto out_free_xid;516 }517 518 /* Always make new connection for now (TODO?) */519 ctx->nosharesock = true;520 521 /* Auth */522 ctx->domainauto = ses->domainAuto;523 ctx->domainname = ses->domainName;524 525 /* no hostname for extra channels */526 ctx->server_hostname = "";527 528 ctx->username = ses->user_name;529 ctx->password = ses->password;530 ctx->sectype = ses->sectype;531 ctx->sign = ses->sign;532 533 /* UNC and paths */534 /* XXX: Use ses->server->hostname? */535 len = sizeof(unc_fmt) + SERVER_NAME_LEN_WITH_NULL;536 ctx->UNC = kzalloc(len, GFP_KERNEL);537 if (!ctx->UNC) {538 rc = -ENOMEM;539 goto out_free_ctx;540 }541 scnprintf(ctx->UNC, len, unc_fmt, ses->ip_addr);542 ctx->prepath = "";543 544 /* Reuse same version as master connection */545 ctx->vals = ses->server->vals;546 ctx->ops = ses->server->ops;547 548 ctx->noblocksnd = ses->server->noblocksnd;549 ctx->noautotune = ses->server->noautotune;550 ctx->sockopt_tcp_nodelay = ses->server->tcp_nodelay;551 ctx->echo_interval = ses->server->echo_interval / HZ;552 ctx->max_credits = ses->server->max_credits;553 554 /*555 * This will be used for encoding/decoding user/domain/pw556 * during sess setup auth.557 */558 ctx->local_nls = ses->local_nls;559 560 /* Use RDMA if possible */561 ctx->rdma = iface->rdma_capable;562 memcpy(&ctx->dstaddr, &iface->sockaddr, sizeof(ctx->dstaddr));563 564 /* reuse master con client guid */565 memcpy(&ctx->client_guid, ses->server->client_guid,566 sizeof(ctx->client_guid));567 ctx->use_client_guid = true;568 569 chan_server = cifs_get_tcp_session(ctx, ses->server);570 571 spin_lock(&ses->chan_lock);572 chan = &ses->chans[ses->chan_count];573 chan->server = chan_server;574 if (IS_ERR(chan->server)) {575 rc = PTR_ERR(chan->server);576 chan->server = NULL;577 spin_unlock(&ses->chan_lock);578 goto out;579 }580 chan->iface = iface;581 ses->chan_count++;582 atomic_set(&ses->chan_seq, 0);583 584 /* Mark this channel as needing connect/setup */585 cifs_chan_set_need_reconnect(ses, chan->server);586 587 spin_unlock(&ses->chan_lock);588 589 mutex_lock(&ses->session_mutex);590 /*591 * We need to allocate the server crypto now as we will need592 * to sign packets before we generate the channel signing key593 * (we sign with the session key)594 */595 rc = smb311_crypto_shash_allocate(chan->server);596 if (rc) {597 cifs_dbg(VFS, "%s: crypto alloc failed\n", __func__);598 mutex_unlock(&ses->session_mutex);599 goto out;600 }601 602 rc = cifs_negotiate_protocol(xid, ses, chan->server);603 if (!rc)604 rc = cifs_setup_session(xid, ses, chan->server, ses->local_nls);605 606 mutex_unlock(&ses->session_mutex);607 608out:609 if (rc && chan->server) {610 cifs_put_tcp_session(chan->server, 0);611 612 spin_lock(&ses->chan_lock);613 614 /* we rely on all bits beyond chan_count to be clear */615 cifs_chan_clear_need_reconnect(ses, chan->server);616 ses->chan_count--;617 /*618 * chan_count should never reach 0 as at least the primary619 * channel is always allocated620 */621 WARN_ON(ses->chan_count < 1);622 spin_unlock(&ses->chan_lock);623 }624 625 kfree(ctx->UNC);626out_free_ctx:627 kfree(ctx);628out_free_xid:629 free_xid(xid);630 return rc;631}632 633#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY634static __u32 cifs_ssetup_hdr(struct cifs_ses *ses,635 struct TCP_Server_Info *server,636 SESSION_SETUP_ANDX *pSMB)637{638 __u32 capabilities = 0;639 640 /* init fields common to all four types of SessSetup */641 /* Note that offsets for first seven fields in req struct are same */642 /* in CIFS Specs so does not matter which of 3 forms of struct */643 /* that we use in next few lines */644 /* Note that header is initialized to zero in header_assemble */645 pSMB->req.AndXCommand = 0xFF;646 pSMB->req.MaxBufferSize = cpu_to_le16(min_t(u32,647 CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4,648 USHRT_MAX));649 pSMB->req.MaxMpxCount = cpu_to_le16(server->maxReq);650 pSMB->req.VcNumber = cpu_to_le16(1);651 652 /* Now no need to set SMBFLG_CASELESS or obsolete CANONICAL PATH */653 654 /* BB verify whether signing required on neg or just auth frame (and NTLM case) */655 656 capabilities = CAP_LARGE_FILES | CAP_NT_SMBS | CAP_LEVEL_II_OPLOCKS |657 CAP_LARGE_WRITE_X | CAP_LARGE_READ_X;658 659 if (server->sign)660 pSMB->req.hdr.Flags2 |= SMBFLG2_SECURITY_SIGNATURE;661 662 if (ses->capabilities & CAP_UNICODE) {663 pSMB->req.hdr.Flags2 |= SMBFLG2_UNICODE;664 capabilities |= CAP_UNICODE;665 }666 if (ses->capabilities & CAP_STATUS32) {667 pSMB->req.hdr.Flags2 |= SMBFLG2_ERR_STATUS;668 capabilities |= CAP_STATUS32;669 }670 if (ses->capabilities & CAP_DFS) {671 pSMB->req.hdr.Flags2 |= SMBFLG2_DFS;672 capabilities |= CAP_DFS;673 }674 if (ses->capabilities & CAP_UNIX)675 capabilities |= CAP_UNIX;676 677 return capabilities;678}679 680static void681unicode_oslm_strings(char **pbcc_area, const struct nls_table *nls_cp)682{683 char *bcc_ptr = *pbcc_area;684 int bytes_ret = 0;685 686 /* Copy OS version */687 bytes_ret = cifs_strtoUTF16((__le16 *)bcc_ptr, "Linux version ", 32,688 nls_cp);689 bcc_ptr += 2 * bytes_ret;690 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, init_utsname()->release,691 32, nls_cp);692 bcc_ptr += 2 * bytes_ret;693 bcc_ptr += 2; /* trailing null */694 695 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, CIFS_NETWORK_OPSYS,696 32, nls_cp);697 bcc_ptr += 2 * bytes_ret;698 bcc_ptr += 2; /* trailing null */699 700 *pbcc_area = bcc_ptr;701}702 703static void unicode_domain_string(char **pbcc_area, struct cifs_ses *ses,704 const struct nls_table *nls_cp)705{706 char *bcc_ptr = *pbcc_area;707 int bytes_ret = 0;708 709 /* copy domain */710 if (ses->domainName == NULL) {711 /*712 * Sending null domain better than using a bogus domain name (as713 * we did briefly in 2.6.18) since server will use its default714 */715 *bcc_ptr = 0;716 *(bcc_ptr+1) = 0;717 bytes_ret = 0;718 } else719 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->domainName,720 CIFS_MAX_DOMAINNAME_LEN, nls_cp);721 bcc_ptr += 2 * bytes_ret;722 bcc_ptr += 2; /* account for null terminator */723 724 *pbcc_area = bcc_ptr;725}726 727static void unicode_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,728 const struct nls_table *nls_cp)729{730 char *bcc_ptr = *pbcc_area;731 int bytes_ret = 0;732 733 /* BB FIXME add check that strings less than 335 or will need to send as arrays */734 735 /* copy user */736 if (ses->user_name == NULL) {737 /* null user mount */738 *bcc_ptr = 0;739 *(bcc_ptr+1) = 0;740 } else {741 bytes_ret = cifs_strtoUTF16((__le16 *) bcc_ptr, ses->user_name,742 CIFS_MAX_USERNAME_LEN, nls_cp);743 }744 bcc_ptr += 2 * bytes_ret;745 bcc_ptr += 2; /* account for null termination */746 747 unicode_domain_string(&bcc_ptr, ses, nls_cp);748 unicode_oslm_strings(&bcc_ptr, nls_cp);749 750 *pbcc_area = bcc_ptr;751}752 753static void ascii_ssetup_strings(char **pbcc_area, struct cifs_ses *ses,754 const struct nls_table *nls_cp)755{756 char *bcc_ptr = *pbcc_area;757 int len;758 759 /* copy user */760 /* BB what about null user mounts - check that we do this BB */761 /* copy user */762 if (ses->user_name != NULL) {763 len = strscpy(bcc_ptr, ses->user_name, CIFS_MAX_USERNAME_LEN);764 if (WARN_ON_ONCE(len < 0))765 len = CIFS_MAX_USERNAME_LEN - 1;766 bcc_ptr += len;767 }768 /* else null user mount */769 *bcc_ptr = 0;770 bcc_ptr++; /* account for null termination */771 772 /* copy domain */773 if (ses->domainName != NULL) {774 len = strscpy(bcc_ptr, ses->domainName, CIFS_MAX_DOMAINNAME_LEN);775 if (WARN_ON_ONCE(len < 0))776 len = CIFS_MAX_DOMAINNAME_LEN - 1;777 bcc_ptr += len;778 } /* else we send a null domain name so server will default to its own domain */779 *bcc_ptr = 0;780 bcc_ptr++;781 782 /* BB check for overflow here */783 784 strcpy(bcc_ptr, "Linux version ");785 bcc_ptr += strlen("Linux version ");786 strcpy(bcc_ptr, init_utsname()->release);787 bcc_ptr += strlen(init_utsname()->release) + 1;788 789 strcpy(bcc_ptr, CIFS_NETWORK_OPSYS);790 bcc_ptr += strlen(CIFS_NETWORK_OPSYS) + 1;791 792 *pbcc_area = bcc_ptr;793}794 795static void796decode_unicode_ssetup(char **pbcc_area, int bleft, struct cifs_ses *ses,797 const struct nls_table *nls_cp)798{799 int len;800 char *data = *pbcc_area;801 802 cifs_dbg(FYI, "bleft %d\n", bleft);803 804 kfree(ses->serverOS);805 ses->serverOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);806 cifs_dbg(FYI, "serverOS=%s\n", ses->serverOS);807 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;808 data += len;809 bleft -= len;810 if (bleft <= 0)811 return;812 813 kfree(ses->serverNOS);814 ses->serverNOS = cifs_strndup_from_utf16(data, bleft, true, nls_cp);815 cifs_dbg(FYI, "serverNOS=%s\n", ses->serverNOS);816 len = (UniStrnlen((wchar_t *) data, bleft / 2) * 2) + 2;817 data += len;818 bleft -= len;819 if (bleft <= 0)820 return;821 822 kfree(ses->serverDomain);823 ses->serverDomain = cifs_strndup_from_utf16(data, bleft, true, nls_cp);824 cifs_dbg(FYI, "serverDomain=%s\n", ses->serverDomain);825 826 return;827}828 829static void decode_ascii_ssetup(char **pbcc_area, __u16 bleft,830 struct cifs_ses *ses,831 const struct nls_table *nls_cp)832{833 int len;834 char *bcc_ptr = *pbcc_area;835 836 cifs_dbg(FYI, "decode sessetup ascii. bleft %d\n", bleft);837 838 len = strnlen(bcc_ptr, bleft);839 if (len >= bleft)840 return;841 842 kfree(ses->serverOS);843 844 ses->serverOS = kmalloc(len + 1, GFP_KERNEL);845 if (ses->serverOS) {846 memcpy(ses->serverOS, bcc_ptr, len);847 ses->serverOS[len] = 0;848 if (strncmp(ses->serverOS, "OS/2", 4) == 0)849 cifs_dbg(FYI, "OS/2 server\n");850 }851 852 bcc_ptr += len + 1;853 bleft -= len + 1;854 855 len = strnlen(bcc_ptr, bleft);856 if (len >= bleft)857 return;858 859 kfree(ses->serverNOS);860 861 ses->serverNOS = kmalloc(len + 1, GFP_KERNEL);862 if (ses->serverNOS) {863 memcpy(ses->serverNOS, bcc_ptr, len);864 ses->serverNOS[len] = 0;865 }866 867 bcc_ptr += len + 1;868 bleft -= len + 1;869 870 len = strnlen(bcc_ptr, bleft);871 if (len > bleft)872 return;873 874 /*875 * No domain field in LANMAN case. Domain is876 * returned by old servers in the SMB negprot response877 *878 * BB For newer servers which do not support Unicode,879 * but thus do return domain here, we could add parsing880 * for it later, but it is not very important881 */882 cifs_dbg(FYI, "ascii: bytes left %d\n", bleft);883}884#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */885 886int decode_ntlmssp_challenge(char *bcc_ptr, int blob_len,887 struct cifs_ses *ses)888{889 unsigned int tioffset; /* challenge message target info area */890 unsigned int tilen; /* challenge message target info area length */891 CHALLENGE_MESSAGE *pblob = (CHALLENGE_MESSAGE *)bcc_ptr;892 __u32 server_flags;893 894 if (blob_len < sizeof(CHALLENGE_MESSAGE)) {895 cifs_dbg(VFS, "challenge blob len %d too small\n", blob_len);896 return -EINVAL;897 }898 899 if (memcmp(pblob->Signature, "NTLMSSP", 8)) {900 cifs_dbg(VFS, "blob signature incorrect %s\n",901 pblob->Signature);902 return -EINVAL;903 }904 if (pblob->MessageType != NtLmChallenge) {905 cifs_dbg(VFS, "Incorrect message type %d\n",906 pblob->MessageType);907 return -EINVAL;908 }909 910 server_flags = le32_to_cpu(pblob->NegotiateFlags);911 cifs_dbg(FYI, "%s: negotiate=0x%08x challenge=0x%08x\n", __func__,912 ses->ntlmssp->client_flags, server_flags);913 914 if ((ses->ntlmssp->client_flags & (NTLMSSP_NEGOTIATE_SEAL | NTLMSSP_NEGOTIATE_SIGN)) &&915 (!(server_flags & NTLMSSP_NEGOTIATE_56) && !(server_flags & NTLMSSP_NEGOTIATE_128))) {916 cifs_dbg(VFS, "%s: requested signing/encryption but server did not return either 56-bit or 128-bit session key size\n",917 __func__);918 return -EINVAL;919 }920 if (!(server_flags & NTLMSSP_NEGOTIATE_NTLM) && !(server_flags & NTLMSSP_NEGOTIATE_EXTENDED_SEC)) {921 cifs_dbg(VFS, "%s: server does not seem to support either NTLMv1 or NTLMv2\n", __func__);922 return -EINVAL;923 }924 if (ses->server->sign && !(server_flags & NTLMSSP_NEGOTIATE_SIGN)) {925 cifs_dbg(VFS, "%s: forced packet signing but server does not seem to support it\n",926 __func__);927 return -EOPNOTSUPP;928 }929 if ((ses->ntlmssp->client_flags & NTLMSSP_NEGOTIATE_KEY_XCH) &&930 !(server_flags & NTLMSSP_NEGOTIATE_KEY_XCH))931 pr_warn_once("%s: authentication has been weakened as server does not support key exchange\n",932 __func__);933 934 ses->ntlmssp->server_flags = server_flags;935 936 memcpy(ses->ntlmssp->cryptkey, pblob->Challenge, CIFS_CRYPTO_KEY_SIZE);937 /*938 * In particular we can examine sign flags939 *940 * BB spec says that if AvId field of MsvAvTimestamp is populated then941 * we must set the MIC field of the AUTHENTICATE_MESSAGE942 */943 944 tioffset = le32_to_cpu(pblob->TargetInfoArray.BufferOffset);945 tilen = le16_to_cpu(pblob->TargetInfoArray.Length);946 if (tioffset > blob_len || tioffset + tilen > blob_len) {947 cifs_dbg(VFS, "tioffset + tilen too high %u + %u\n",948 tioffset, tilen);949 return -EINVAL;950 }951 if (tilen) {952 kfree_sensitive(ses->auth_key.response);953 ses->auth_key.response = kmemdup(bcc_ptr + tioffset, tilen,954 GFP_KERNEL);955 if (!ses->auth_key.response) {956 cifs_dbg(VFS, "Challenge target info alloc failure\n");957 return -ENOMEM;958 }959 ses->auth_key.len = tilen;960 }961 962 return 0;963}964 965static int size_of_ntlmssp_blob(struct cifs_ses *ses, int base_size)966{967 int sz = base_size + ses->auth_key.len968 - CIFS_SESS_KEY_SIZE + CIFS_CPHTXT_SIZE + 2;969 970 if (ses->domainName)971 sz += sizeof(__le16) * strnlen(ses->domainName, CIFS_MAX_DOMAINNAME_LEN);972 else973 sz += sizeof(__le16);974 975 if (ses->user_name)976 sz += sizeof(__le16) * strnlen(ses->user_name, CIFS_MAX_USERNAME_LEN);977 else978 sz += sizeof(__le16);979 980 if (ses->workstation_name[0])981 sz += sizeof(__le16) * strnlen(ses->workstation_name,982 ntlmssp_workstation_name_size(ses));983 else984 sz += sizeof(__le16);985 986 return sz;987}988 989static inline void cifs_security_buffer_from_str(SECURITY_BUFFER *pbuf,990 char *str_value,991 int str_length,992 unsigned char *pstart,993 unsigned char **pcur,994 const struct nls_table *nls_cp)995{996 unsigned char *tmp = pstart;997 int len;998 999 if (!pbuf)1000 return;1001 1002 if (!pcur)1003 pcur = &tmp;1004 1005 if (!str_value) {1006 pbuf->BufferOffset = cpu_to_le32(*pcur - pstart);1007 pbuf->Length = 0;1008 pbuf->MaximumLength = 0;1009 *pcur += sizeof(__le16);1010 } else {1011 len = cifs_strtoUTF16((__le16 *)*pcur,1012 str_value,1013 str_length,1014 nls_cp);1015 len *= sizeof(__le16);1016 pbuf->BufferOffset = cpu_to_le32(*pcur - pstart);1017 pbuf->Length = cpu_to_le16(len);1018 pbuf->MaximumLength = cpu_to_le16(len);1019 *pcur += len;1020 }1021}1022 1023/* BB Move to ntlmssp.c eventually */1024 1025int build_ntlmssp_negotiate_blob(unsigned char **pbuffer,1026 u16 *buflen,1027 struct cifs_ses *ses,1028 struct TCP_Server_Info *server,1029 const struct nls_table *nls_cp)1030{1031 int rc = 0;1032 NEGOTIATE_MESSAGE *sec_blob;1033 __u32 flags;1034 unsigned char *tmp;1035 int len;1036 1037 len = size_of_ntlmssp_blob(ses, sizeof(NEGOTIATE_MESSAGE));1038 *pbuffer = kmalloc(len, GFP_KERNEL);1039 if (!*pbuffer) {1040 rc = -ENOMEM;1041 cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc);1042 *buflen = 0;1043 goto setup_ntlm_neg_ret;1044 }1045 sec_blob = (NEGOTIATE_MESSAGE *)*pbuffer;1046 1047 memset(*pbuffer, 0, sizeof(NEGOTIATE_MESSAGE));1048 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);1049 sec_blob->MessageType = NtLmNegotiate;1050 1051 /* BB is NTLMV2 session security format easier to use here? */1052 flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET |1053 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |1054 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC |1055 NTLMSSP_NEGOTIATE_ALWAYS_SIGN | NTLMSSP_NEGOTIATE_SEAL |1056 NTLMSSP_NEGOTIATE_SIGN;1057 if (!server->session_estab || ses->ntlmssp->sesskey_per_smbsess)1058 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;1059 1060 tmp = *pbuffer + sizeof(NEGOTIATE_MESSAGE);1061 ses->ntlmssp->client_flags = flags;1062 sec_blob->NegotiateFlags = cpu_to_le32(flags);1063 1064 /* these fields should be null in negotiate phase MS-NLMP 3.1.5.1.1 */1065 cifs_security_buffer_from_str(&sec_blob->DomainName,1066 NULL,1067 CIFS_MAX_DOMAINNAME_LEN,1068 *pbuffer, &tmp,1069 nls_cp);1070 1071 cifs_security_buffer_from_str(&sec_blob->WorkstationName,1072 NULL,1073 CIFS_MAX_WORKSTATION_LEN,1074 *pbuffer, &tmp,1075 nls_cp);1076 1077 *buflen = tmp - *pbuffer;1078setup_ntlm_neg_ret:1079 return rc;1080}1081 1082/*1083 * Build ntlmssp blob with additional fields, such as version,1084 * supported by modern servers. For safety limit to SMB3 or later1085 * See notes in MS-NLMP Section 2.2.2.1 e.g.1086 */1087int build_ntlmssp_smb3_negotiate_blob(unsigned char **pbuffer,1088 u16 *buflen,1089 struct cifs_ses *ses,1090 struct TCP_Server_Info *server,1091 const struct nls_table *nls_cp)1092{1093 int rc = 0;1094 struct negotiate_message *sec_blob;1095 __u32 flags;1096 unsigned char *tmp;1097 int len;1098 1099 len = size_of_ntlmssp_blob(ses, sizeof(struct negotiate_message));1100 *pbuffer = kmalloc(len, GFP_KERNEL);1101 if (!*pbuffer) {1102 rc = -ENOMEM;1103 cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc);1104 *buflen = 0;1105 goto setup_ntlm_smb3_neg_ret;1106 }1107 sec_blob = (struct negotiate_message *)*pbuffer;1108 1109 memset(*pbuffer, 0, sizeof(struct negotiate_message));1110 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);1111 sec_blob->MessageType = NtLmNegotiate;1112 1113 /* BB is NTLMV2 session security format easier to use here? */1114 flags = NTLMSSP_NEGOTIATE_56 | NTLMSSP_REQUEST_TARGET |1115 NTLMSSP_NEGOTIATE_128 | NTLMSSP_NEGOTIATE_UNICODE |1116 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_EXTENDED_SEC |1117 NTLMSSP_NEGOTIATE_ALWAYS_SIGN | NTLMSSP_NEGOTIATE_SEAL |1118 NTLMSSP_NEGOTIATE_SIGN | NTLMSSP_NEGOTIATE_VERSION;1119 if (!server->session_estab || ses->ntlmssp->sesskey_per_smbsess)1120 flags |= NTLMSSP_NEGOTIATE_KEY_XCH;1121 1122 sec_blob->Version.ProductMajorVersion = LINUX_VERSION_MAJOR;1123 sec_blob->Version.ProductMinorVersion = LINUX_VERSION_PATCHLEVEL;1124 sec_blob->Version.ProductBuild = cpu_to_le16(SMB3_PRODUCT_BUILD);1125 sec_blob->Version.NTLMRevisionCurrent = NTLMSSP_REVISION_W2K3;1126 1127 tmp = *pbuffer + sizeof(struct negotiate_message);1128 ses->ntlmssp->client_flags = flags;1129 sec_blob->NegotiateFlags = cpu_to_le32(flags);1130 1131 /* these fields should be null in negotiate phase MS-NLMP 3.1.5.1.1 */1132 cifs_security_buffer_from_str(&sec_blob->DomainName,1133 NULL,1134 CIFS_MAX_DOMAINNAME_LEN,1135 *pbuffer, &tmp,1136 nls_cp);1137 1138 cifs_security_buffer_from_str(&sec_blob->WorkstationName,1139 NULL,1140 CIFS_MAX_WORKSTATION_LEN,1141 *pbuffer, &tmp,1142 nls_cp);1143 1144 *buflen = tmp - *pbuffer;1145setup_ntlm_smb3_neg_ret:1146 return rc;1147}1148 1149 1150/* See MS-NLMP 2.2.1.3 */1151int build_ntlmssp_auth_blob(unsigned char **pbuffer,1152 u16 *buflen,1153 struct cifs_ses *ses,1154 struct TCP_Server_Info *server,1155 const struct nls_table *nls_cp)1156{1157 int rc;1158 AUTHENTICATE_MESSAGE *sec_blob;1159 __u32 flags;1160 unsigned char *tmp;1161 int len;1162 1163 rc = setup_ntlmv2_rsp(ses, nls_cp);1164 if (rc) {1165 cifs_dbg(VFS, "Error %d during NTLMSSP authentication\n", rc);1166 *buflen = 0;1167 goto setup_ntlmv2_ret;1168 }1169 1170 len = size_of_ntlmssp_blob(ses, sizeof(AUTHENTICATE_MESSAGE));1171 *pbuffer = kmalloc(len, GFP_KERNEL);1172 if (!*pbuffer) {1173 rc = -ENOMEM;1174 cifs_dbg(VFS, "Error %d during NTLMSSP allocation\n", rc);1175 *buflen = 0;1176 goto setup_ntlmv2_ret;1177 }1178 sec_blob = (AUTHENTICATE_MESSAGE *)*pbuffer;1179 1180 memcpy(sec_blob->Signature, NTLMSSP_SIGNATURE, 8);1181 sec_blob->MessageType = NtLmAuthenticate;1182 1183 /* send version information in ntlmssp authenticate also */1184 flags = ses->ntlmssp->server_flags | NTLMSSP_REQUEST_TARGET |1185 NTLMSSP_NEGOTIATE_TARGET_INFO | NTLMSSP_NEGOTIATE_VERSION |1186 NTLMSSP_NEGOTIATE_WORKSTATION_SUPPLIED;1187 1188 sec_blob->Version.ProductMajorVersion = LINUX_VERSION_MAJOR;1189 sec_blob->Version.ProductMinorVersion = LINUX_VERSION_PATCHLEVEL;1190 sec_blob->Version.ProductBuild = cpu_to_le16(SMB3_PRODUCT_BUILD);1191 sec_blob->Version.NTLMRevisionCurrent = NTLMSSP_REVISION_W2K3;1192 1193 tmp = *pbuffer + sizeof(AUTHENTICATE_MESSAGE);1194 sec_blob->NegotiateFlags = cpu_to_le32(flags);1195 1196 sec_blob->LmChallengeResponse.BufferOffset =1197 cpu_to_le32(sizeof(AUTHENTICATE_MESSAGE));1198 sec_blob->LmChallengeResponse.Length = 0;1199 sec_blob->LmChallengeResponse.MaximumLength = 0;1200 1201 sec_blob->NtChallengeResponse.BufferOffset =1202 cpu_to_le32(tmp - *pbuffer);1203 if (ses->user_name != NULL) {1204 memcpy(tmp, ses->auth_key.response + CIFS_SESS_KEY_SIZE,1205 ses->auth_key.len - CIFS_SESS_KEY_SIZE);1206 tmp += ses->auth_key.len - CIFS_SESS_KEY_SIZE;1207 1208 sec_blob->NtChallengeResponse.Length =1209 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);1210 sec_blob->NtChallengeResponse.MaximumLength =1211 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);1212 } else {1213 /*1214 * don't send an NT Response for anonymous access1215 */1216 sec_blob->NtChallengeResponse.Length = 0;1217 sec_blob->NtChallengeResponse.MaximumLength = 0;1218 }1219 1220 cifs_security_buffer_from_str(&sec_blob->DomainName,1221 ses->domainName,1222 CIFS_MAX_DOMAINNAME_LEN,1223 *pbuffer, &tmp,1224 nls_cp);1225 1226 cifs_security_buffer_from_str(&sec_blob->UserName,1227 ses->user_name,1228 CIFS_MAX_USERNAME_LEN,1229 *pbuffer, &tmp,1230 nls_cp);1231 1232 cifs_security_buffer_from_str(&sec_blob->WorkstationName,1233 ses->workstation_name,1234 ntlmssp_workstation_name_size(ses),1235 *pbuffer, &tmp,1236 nls_cp);1237 1238 if ((ses->ntlmssp->server_flags & NTLMSSP_NEGOTIATE_KEY_XCH) &&1239 (!ses->server->session_estab || ses->ntlmssp->sesskey_per_smbsess) &&1240 !calc_seckey(ses)) {1241 memcpy(tmp, ses->ntlmssp->ciphertext, CIFS_CPHTXT_SIZE);1242 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer);1243 sec_blob->SessionKey.Length = cpu_to_le16(CIFS_CPHTXT_SIZE);1244 sec_blob->SessionKey.MaximumLength =1245 cpu_to_le16(CIFS_CPHTXT_SIZE);1246 tmp += CIFS_CPHTXT_SIZE;1247 } else {1248 sec_blob->SessionKey.BufferOffset = cpu_to_le32(tmp - *pbuffer);1249 sec_blob->SessionKey.Length = 0;1250 sec_blob->SessionKey.MaximumLength = 0;1251 }1252 1253 *buflen = tmp - *pbuffer;1254setup_ntlmv2_ret:1255 return rc;1256}1257 1258enum securityEnum1259cifs_select_sectype(struct TCP_Server_Info *server, enum securityEnum requested)1260{1261 switch (server->negflavor) {1262 case CIFS_NEGFLAVOR_EXTENDED:1263 switch (requested) {1264 case Kerberos:1265 case RawNTLMSSP:1266 return requested;1267 case Unspecified:1268 if (server->sec_ntlmssp &&1269 (global_secflags & CIFSSEC_MAY_NTLMSSP))1270 return RawNTLMSSP;1271 if ((server->sec_kerberos || server->sec_mskerberos) &&1272 (global_secflags & CIFSSEC_MAY_KRB5))1273 return Kerberos;1274 fallthrough;1275 default:1276 return Unspecified;1277 }1278 case CIFS_NEGFLAVOR_UNENCAP:1279 switch (requested) {1280 case NTLMv2:1281 return requested;1282 case Unspecified:1283 if (global_secflags & CIFSSEC_MAY_NTLMV2)1284 return NTLMv2;1285 break;1286 default:1287 break;1288 }1289 fallthrough;1290 default:1291 return Unspecified;1292 }1293}1294 1295struct sess_data {1296 unsigned int xid;1297 struct cifs_ses *ses;1298 struct TCP_Server_Info *server;1299 struct nls_table *nls_cp;1300 void (*func)(struct sess_data *);1301 int result;1302 1303 /* we will send the SMB in three pieces:1304 * a fixed length beginning part, an optional1305 * SPNEGO blob (which can be zero length), and a1306 * last part which will include the strings1307 * and rest of bcc area. This allows us to avoid1308 * a large buffer 17K allocation1309 */1310 int buf0_type;1311 struct kvec iov[3];1312};1313 1314#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY1315static int1316sess_alloc_buffer(struct sess_data *sess_data, int wct)1317{1318 int rc;1319 struct cifs_ses *ses = sess_data->ses;1320 struct smb_hdr *smb_buf;1321 1322 rc = small_smb_init_no_tc(SMB_COM_SESSION_SETUP_ANDX, wct, ses,1323 (void **)&smb_buf);1324 1325 if (rc)1326 return rc;1327 1328 sess_data->iov[0].iov_base = (char *)smb_buf;1329 sess_data->iov[0].iov_len = be32_to_cpu(smb_buf->smb_buf_length) + 4;1330 /*1331 * This variable will be used to clear the buffer1332 * allocated above in case of any error in the calling function.1333 */1334 sess_data->buf0_type = CIFS_SMALL_BUFFER;1335 1336 /* 2000 big enough to fit max user, domain, NOS name etc. */1337 sess_data->iov[2].iov_base = kmalloc(2000, GFP_KERNEL);1338 if (!sess_data->iov[2].iov_base) {1339 rc = -ENOMEM;1340 goto out_free_smb_buf;1341 }1342 1343 return 0;1344 1345out_free_smb_buf:1346 cifs_small_buf_release(smb_buf);1347 sess_data->iov[0].iov_base = NULL;1348 sess_data->iov[0].iov_len = 0;1349 sess_data->buf0_type = CIFS_NO_BUFFER;1350 return rc;1351}1352 1353static void1354sess_free_buffer(struct sess_data *sess_data)1355{1356 struct kvec *iov = sess_data->iov;1357 1358 /*1359 * Zero the session data before freeing, as it might contain sensitive info (keys, etc).1360 * Note that iov[1] is already freed by caller.1361 */1362 if (sess_data->buf0_type != CIFS_NO_BUFFER && iov[0].iov_base)1363 memzero_explicit(iov[0].iov_base, iov[0].iov_len);1364 1365 free_rsp_buf(sess_data->buf0_type, iov[0].iov_base);1366 sess_data->buf0_type = CIFS_NO_BUFFER;1367 kfree_sensitive(iov[2].iov_base);1368}1369 1370static int1371sess_establish_session(struct sess_data *sess_data)1372{1373 struct cifs_ses *ses = sess_data->ses;1374 struct TCP_Server_Info *server = sess_data->server;1375 1376 cifs_server_lock(server);1377 if (!server->session_estab) {1378 if (server->sign) {1379 server->session_key.response =1380 kmemdup(ses->auth_key.response,1381 ses->auth_key.len, GFP_KERNEL);1382 if (!server->session_key.response) {1383 cifs_server_unlock(server);1384 return -ENOMEM;1385 }1386 server->session_key.len =1387 ses->auth_key.len;1388 }1389 server->sequence_number = 0x2;1390 server->session_estab = true;1391 }1392 cifs_server_unlock(server);1393 1394 cifs_dbg(FYI, "CIFS session established successfully\n");1395 return 0;1396}1397 1398static int1399sess_sendreceive(struct sess_data *sess_data)1400{1401 int rc;1402 struct smb_hdr *smb_buf = (struct smb_hdr *) sess_data->iov[0].iov_base;1403 __u16 count;1404 struct kvec rsp_iov = { NULL, 0 };1405 1406 count = sess_data->iov[1].iov_len + sess_data->iov[2].iov_len;1407 be32_add_cpu(&smb_buf->smb_buf_length, count);1408 put_bcc(count, smb_buf);1409 1410 rc = SendReceive2(sess_data->xid, sess_data->ses,1411 sess_data->iov, 3 /* num_iovecs */,1412 &sess_data->buf0_type,1413 CIFS_LOG_ERROR, &rsp_iov);1414 cifs_small_buf_release(sess_data->iov[0].iov_base);1415 memcpy(&sess_data->iov[0], &rsp_iov, sizeof(struct kvec));1416 1417 return rc;1418}1419 1420static void1421sess_auth_ntlmv2(struct sess_data *sess_data)1422{1423 int rc = 0;1424 struct smb_hdr *smb_buf;1425 SESSION_SETUP_ANDX *pSMB;1426 char *bcc_ptr;1427 struct cifs_ses *ses = sess_data->ses;1428 struct TCP_Server_Info *server = sess_data->server;1429 __u32 capabilities;1430 __u16 bytes_remaining;1431 1432 /* old style NTLM sessionsetup */1433 /* wct = 13 */1434 rc = sess_alloc_buffer(sess_data, 13);1435 if (rc)1436 goto out;1437 1438 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;1439 bcc_ptr = sess_data->iov[2].iov_base;1440 capabilities = cifs_ssetup_hdr(ses, server, pSMB);1441 1442 pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);1443 1444 /* LM2 password would be here if we supported it */1445 pSMB->req_no_secext.CaseInsensitivePasswordLength = 0;1446 1447 if (ses->user_name != NULL) {1448 /* calculate nlmv2 response and session key */1449 rc = setup_ntlmv2_rsp(ses, sess_data->nls_cp);1450 if (rc) {1451 cifs_dbg(VFS, "Error %d during NTLMv2 authentication\n", rc);1452 goto out;1453 }1454 1455 memcpy(bcc_ptr, ses->auth_key.response + CIFS_SESS_KEY_SIZE,1456 ses->auth_key.len - CIFS_SESS_KEY_SIZE);1457 bcc_ptr += ses->auth_key.len - CIFS_SESS_KEY_SIZE;1458 1459 /* set case sensitive password length after tilen may get1460 * assigned, tilen is 0 otherwise.1461 */1462 pSMB->req_no_secext.CaseSensitivePasswordLength =1463 cpu_to_le16(ses->auth_key.len - CIFS_SESS_KEY_SIZE);1464 } else {1465 pSMB->req_no_secext.CaseSensitivePasswordLength = 0;1466 }1467 1468 if (ses->capabilities & CAP_UNICODE) {1469 if (!IS_ALIGNED(sess_data->iov[0].iov_len, 2)) {1470 *bcc_ptr = 0;1471 bcc_ptr++;1472 }1473 unicode_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);1474 } else {1475 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);1476 }1477 1478 1479 sess_data->iov[2].iov_len = (long) bcc_ptr -1480 (long) sess_data->iov[2].iov_base;1481 1482 rc = sess_sendreceive(sess_data);1483 if (rc)1484 goto out;1485 1486 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;1487 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;1488 1489 if (smb_buf->WordCount != 3) {1490 rc = -EIO;1491 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);1492 goto out;1493 }1494 1495 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)1496 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */1497 1498 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */1499 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);1500 1501 bytes_remaining = get_bcc(smb_buf);1502 bcc_ptr = pByteArea(smb_buf);1503 1504 /* BB check if Unicode and decode strings */1505 if (bytes_remaining == 0) {1506 /* no string area to decode, do nothing */1507 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {1508 /* unicode string area must be word-aligned */1509 if (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) {1510 ++bcc_ptr;1511 --bytes_remaining;1512 }1513 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,1514 sess_data->nls_cp);1515 } else {1516 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,1517 sess_data->nls_cp);1518 }1519 1520 rc = sess_establish_session(sess_data);1521out:1522 sess_data->result = rc;1523 sess_data->func = NULL;1524 sess_free_buffer(sess_data);1525 kfree_sensitive(ses->auth_key.response);1526 ses->auth_key.response = NULL;1527}1528 1529#ifdef CONFIG_CIFS_UPCALL1530static void1531sess_auth_kerberos(struct sess_data *sess_data)1532{1533 int rc = 0;1534 struct smb_hdr *smb_buf;1535 SESSION_SETUP_ANDX *pSMB;1536 char *bcc_ptr;1537 struct cifs_ses *ses = sess_data->ses;1538 struct TCP_Server_Info *server = sess_data->server;1539 __u32 capabilities;1540 __u16 bytes_remaining;1541 struct key *spnego_key = NULL;1542 struct cifs_spnego_msg *msg;1543 u16 blob_len;1544 1545 /* extended security */1546 /* wct = 12 */1547 rc = sess_alloc_buffer(sess_data, 12);1548 if (rc)1549 goto out;1550 1551 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;1552 bcc_ptr = sess_data->iov[2].iov_base;1553 capabilities = cifs_ssetup_hdr(ses, server, pSMB);1554 1555 spnego_key = cifs_get_spnego_key(ses, server);1556 if (IS_ERR(spnego_key)) {1557 rc = PTR_ERR(spnego_key);1558 spnego_key = NULL;1559 goto out;1560 }1561 1562 msg = spnego_key->payload.data[0];1563 /*1564 * check version field to make sure that cifs.upcall is1565 * sending us a response in an expected form1566 */1567 if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {1568 cifs_dbg(VFS, "incorrect version of cifs.upcall (expected %d but got %d)\n",1569 CIFS_SPNEGO_UPCALL_VERSION, msg->version);1570 rc = -EKEYREJECTED;1571 goto out_put_spnego_key;1572 }1573 1574 kfree_sensitive(ses->auth_key.response);1575 ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,1576 GFP_KERNEL);1577 if (!ses->auth_key.response) {1578 cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory\n",1579 msg->sesskey_len);1580 rc = -ENOMEM;1581 goto out_put_spnego_key;1582 }1583 ses->auth_key.len = msg->sesskey_len;1584 1585 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;1586 capabilities |= CAP_EXTENDED_SECURITY;1587 pSMB->req.Capabilities = cpu_to_le32(capabilities);1588 sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;1589 sess_data->iov[1].iov_len = msg->secblob_len;1590 pSMB->req.SecurityBlobLength = cpu_to_le16(sess_data->iov[1].iov_len);1591 1592 if (ses->capabilities & CAP_UNICODE) {1593 /* unicode strings must be word aligned */1594 if (!IS_ALIGNED(sess_data->iov[0].iov_len + sess_data->iov[1].iov_len, 2)) {1595 *bcc_ptr = 0;1596 bcc_ptr++;1597 }1598 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);1599 unicode_domain_string(&bcc_ptr, ses, sess_data->nls_cp);1600 } else {1601 /* BB: is this right? */1602 ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);1603 }1604 1605 sess_data->iov[2].iov_len = (long) bcc_ptr -1606 (long) sess_data->iov[2].iov_base;1607 1608 rc = sess_sendreceive(sess_data);1609 if (rc)1610 goto out_put_spnego_key;1611 1612 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;1613 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;1614 1615 if (smb_buf->WordCount != 4) {1616 rc = -EIO;1617 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);1618 goto out_put_spnego_key;1619 }1620 1621 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)1622 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */1623 1624 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */1625 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);1626 1627 bytes_remaining = get_bcc(smb_buf);1628 bcc_ptr = pByteArea(smb_buf);1629 1630 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);1631 if (blob_len > bytes_remaining) {1632 cifs_dbg(VFS, "bad security blob length %d\n",1633 blob_len);1634 rc = -EINVAL;1635 goto out_put_spnego_key;1636 }1637 bcc_ptr += blob_len;1638 bytes_remaining -= blob_len;1639 1640 /* BB check if Unicode and decode strings */1641 if (bytes_remaining == 0) {1642 /* no string area to decode, do nothing */1643 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {1644 /* unicode string area must be word-aligned */1645 if (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) {1646 ++bcc_ptr;1647 --bytes_remaining;1648 }1649 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,1650 sess_data->nls_cp);1651 } else {1652 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,1653 sess_data->nls_cp);1654 }1655 1656 rc = sess_establish_session(sess_data);1657out_put_spnego_key:1658 key_invalidate(spnego_key);1659 key_put(spnego_key);1660out:1661 sess_data->result = rc;1662 sess_data->func = NULL;1663 sess_free_buffer(sess_data);1664 kfree_sensitive(ses->auth_key.response);1665 ses->auth_key.response = NULL;1666}1667 1668#endif /* ! CONFIG_CIFS_UPCALL */1669 1670/*1671 * The required kvec buffers have to be allocated before calling this1672 * function.1673 */1674static int1675_sess_auth_rawntlmssp_assemble_req(struct sess_data *sess_data)1676{1677 SESSION_SETUP_ANDX *pSMB;1678 struct cifs_ses *ses = sess_data->ses;1679 struct TCP_Server_Info *server = sess_data->server;1680 __u32 capabilities;1681 char *bcc_ptr;1682 1683 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;1684 1685 capabilities = cifs_ssetup_hdr(ses, server, pSMB);1686 if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) {1687 cifs_dbg(VFS, "NTLMSSP requires Unicode support\n");1688 return -ENOSYS;1689 }1690 1691 pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;1692 capabilities |= CAP_EXTENDED_SECURITY;1693 pSMB->req.Capabilities |= cpu_to_le32(capabilities);1694 1695 bcc_ptr = sess_data->iov[2].iov_base;1696 /* unicode strings must be word aligned */1697 if (!IS_ALIGNED(sess_data->iov[0].iov_len + sess_data->iov[1].iov_len, 2)) {1698 *bcc_ptr = 0;1699 bcc_ptr++;1700 }1701 unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);1702 1703 sess_data->iov[2].iov_len = (long) bcc_ptr -1704 (long) sess_data->iov[2].iov_base;1705 1706 return 0;1707}1708 1709static void1710sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data);1711 1712static void1713sess_auth_rawntlmssp_negotiate(struct sess_data *sess_data)1714{1715 int rc;1716 struct smb_hdr *smb_buf;1717 SESSION_SETUP_ANDX *pSMB;1718 struct cifs_ses *ses = sess_data->ses;1719 struct TCP_Server_Info *server = sess_data->server;1720 __u16 bytes_remaining;1721 char *bcc_ptr;1722 unsigned char *ntlmsspblob = NULL;1723 u16 blob_len;1724 1725 cifs_dbg(FYI, "rawntlmssp session setup negotiate phase\n");1726 1727 /*1728 * if memory allocation is successful, caller of this function1729 * frees it.1730 */1731 ses->ntlmssp = kmalloc(sizeof(struct ntlmssp_auth), GFP_KERNEL);1732 if (!ses->ntlmssp) {1733 rc = -ENOMEM;1734 goto out;1735 }1736 ses->ntlmssp->sesskey_per_smbsess = false;1737 1738 /* wct = 12 */1739 rc = sess_alloc_buffer(sess_data, 12);1740 if (rc)1741 goto out;1742 1743 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;1744 1745 /* Build security blob before we assemble the request */1746 rc = build_ntlmssp_negotiate_blob(&ntlmsspblob,1747 &blob_len, ses, server,1748 sess_data->nls_cp);1749 if (rc)1750 goto out_free_ntlmsspblob;1751 1752 sess_data->iov[1].iov_len = blob_len;1753 sess_data->iov[1].iov_base = ntlmsspblob;1754 pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);1755 1756 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);1757 if (rc)1758 goto out_free_ntlmsspblob;1759 1760 rc = sess_sendreceive(sess_data);1761 1762 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;1763 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;1764 1765 /* If true, rc here is expected and not an error */1766 if (sess_data->buf0_type != CIFS_NO_BUFFER &&1767 smb_buf->Status.CifsError ==1768 cpu_to_le32(NT_STATUS_MORE_PROCESSING_REQUIRED))1769 rc = 0;1770 1771 if (rc)1772 goto out_free_ntlmsspblob;1773 1774 cifs_dbg(FYI, "rawntlmssp session setup challenge phase\n");1775 1776 if (smb_buf->WordCount != 4) {1777 rc = -EIO;1778 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);1779 goto out_free_ntlmsspblob;1780 }1781 1782 ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */1783 cifs_dbg(FYI, "UID = %llu\n", ses->Suid);1784 1785 bytes_remaining = get_bcc(smb_buf);1786 bcc_ptr = pByteArea(smb_buf);1787 1788 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);1789 if (blob_len > bytes_remaining) {1790 cifs_dbg(VFS, "bad security blob length %d\n",1791 blob_len);1792 rc = -EINVAL;1793 goto out_free_ntlmsspblob;1794 }1795 1796 rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses);1797 1798out_free_ntlmsspblob:1799 kfree_sensitive(ntlmsspblob);1800out:1801 sess_free_buffer(sess_data);1802 1803 if (!rc) {1804 sess_data->func = sess_auth_rawntlmssp_authenticate;1805 return;1806 }1807 1808 /* Else error. Cleanup */1809 kfree_sensitive(ses->auth_key.response);1810 ses->auth_key.response = NULL;1811 kfree_sensitive(ses->ntlmssp);1812 ses->ntlmssp = NULL;1813 1814 sess_data->func = NULL;1815 sess_data->result = rc;1816}1817 1818static void1819sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data)1820{1821 int rc;1822 struct smb_hdr *smb_buf;1823 SESSION_SETUP_ANDX *pSMB;1824 struct cifs_ses *ses = sess_data->ses;1825 struct TCP_Server_Info *server = sess_data->server;1826 __u16 bytes_remaining;1827 char *bcc_ptr;1828 unsigned char *ntlmsspblob = NULL;1829 u16 blob_len;1830 1831 cifs_dbg(FYI, "rawntlmssp session setup authenticate phase\n");1832 1833 /* wct = 12 */1834 rc = sess_alloc_buffer(sess_data, 12);1835 if (rc)1836 goto out;1837 1838 /* Build security blob before we assemble the request */1839 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;1840 smb_buf = (struct smb_hdr *)pSMB;1841 rc = build_ntlmssp_auth_blob(&ntlmsspblob,1842 &blob_len, ses, server,1843 sess_data->nls_cp);1844 if (rc)1845 goto out_free_ntlmsspblob;1846 sess_data->iov[1].iov_len = blob_len;1847 sess_data->iov[1].iov_base = ntlmsspblob;1848 pSMB->req.SecurityBlobLength = cpu_to_le16(blob_len);1849 /*1850 * Make sure that we tell the server that we are using1851 * the uid that it just gave us back on the response1852 * (challenge)1853 */1854 smb_buf->Uid = ses->Suid;1855 1856 rc = _sess_auth_rawntlmssp_assemble_req(sess_data);1857 if (rc)1858 goto out_free_ntlmsspblob;1859 1860 rc = sess_sendreceive(sess_data);1861 if (rc)1862 goto out_free_ntlmsspblob;1863 1864 pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;1865 smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;1866 if (smb_buf->WordCount != 4) {1867 rc = -EIO;1868 cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);1869 goto out_free_ntlmsspblob;1870 }1871 1872 if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)1873 cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */1874 1875 if (ses->Suid != smb_buf->Uid) {1876 ses->Suid = smb_buf->Uid;1877 cifs_dbg(FYI, "UID changed! new UID = %llu\n", ses->Suid);1878 }1879 1880 bytes_remaining = get_bcc(smb_buf);1881 bcc_ptr = pByteArea(smb_buf);1882 blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);1883 if (blob_len > bytes_remaining) {1884 cifs_dbg(VFS, "bad security blob length %d\n",1885 blob_len);1886 rc = -EINVAL;1887 goto out_free_ntlmsspblob;1888 }1889 bcc_ptr += blob_len;1890 bytes_remaining -= blob_len;1891 1892 1893 /* BB check if Unicode and decode strings */1894 if (bytes_remaining == 0) {1895 /* no string area to decode, do nothing */1896 } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {1897 /* unicode string area must be word-aligned */1898 if (!IS_ALIGNED((unsigned long)bcc_ptr - (unsigned long)smb_buf, 2)) {1899 ++bcc_ptr;1900 --bytes_remaining;1901 }1902 decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,1903 sess_data->nls_cp);1904 } else {1905 decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,1906 sess_data->nls_cp);1907 }1908 1909out_free_ntlmsspblob:1910 kfree_sensitive(ntlmsspblob);1911out:1912 sess_free_buffer(sess_data);1913 1914 if (!rc)1915 rc = sess_establish_session(sess_data);1916 1917 /* Cleanup */1918 kfree_sensitive(ses->auth_key.response);1919 ses->auth_key.response = NULL;1920 kfree_sensitive(ses->ntlmssp);1921 ses->ntlmssp = NULL;1922 1923 sess_data->func = NULL;1924 sess_data->result = rc;1925}1926 1927static int select_sec(struct sess_data *sess_data)1928{1929 int type;1930 struct cifs_ses *ses = sess_data->ses;1931 struct TCP_Server_Info *server = sess_data->server;1932 1933 type = cifs_select_sectype(server, ses->sectype);1934 cifs_dbg(FYI, "sess setup type %d\n", type);1935 if (type == Unspecified) {1936 cifs_dbg(VFS, "Unable to select appropriate authentication method!\n");1937 return -EINVAL;1938 }1939 1940 switch (type) {1941 case NTLMv2:1942 sess_data->func = sess_auth_ntlmv2;1943 break;1944 case Kerberos:1945#ifdef CONFIG_CIFS_UPCALL1946 sess_data->func = sess_auth_kerberos;1947 break;1948#else1949 cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");1950 return -ENOSYS;1951#endif /* CONFIG_CIFS_UPCALL */1952 case RawNTLMSSP:1953 sess_data->func = sess_auth_rawntlmssp_negotiate;1954 break;1955 default:1956 cifs_dbg(VFS, "secType %d not supported!\n", type);1957 return -ENOSYS;1958 }1959 1960 return 0;1961}1962 1963int CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses,1964 struct TCP_Server_Info *server,1965 const struct nls_table *nls_cp)1966{1967 int rc = 0;1968 struct sess_data *sess_data;1969 1970 if (ses == NULL) {1971 WARN(1, "%s: ses == NULL!", __func__);1972 return -EINVAL;1973 }1974 1975 sess_data = kzalloc(sizeof(struct sess_data), GFP_KERNEL);1976 if (!sess_data)1977 return -ENOMEM;1978 1979 sess_data->xid = xid;1980 sess_data->ses = ses;1981 sess_data->server = server;1982 sess_data->buf0_type = CIFS_NO_BUFFER;1983 sess_data->nls_cp = (struct nls_table *) nls_cp;1984 1985 rc = select_sec(sess_data);1986 if (rc)1987 goto out;1988 1989 while (sess_data->func)1990 sess_data->func(sess_data);1991 1992 /* Store result before we free sess_data */1993 rc = sess_data->result;1994 1995out:1996 kfree_sensitive(sess_data);1997 return rc;1998}1999#endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */2000