2 Unix SMB/Netbios implementation.
5 Copyright (C) Andrew Tridgell 1998-2001
6 Copyright (C) Andrew Bartlett 2001
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 uint32 global_client_caps = 0;
26 static struct auth_context *ntlmssp_auth_context = NULL;
29 on a logon error possibly map the error to success if "map to guest"
32 static NTSTATUS do_map_to_guest(NTSTATUS status, auth_serversupplied_info **server_info,
33 const char *user, const char *domain)
35 if (NT_STATUS_EQUAL(status, NT_STATUS_NO_SUCH_USER)) {
36 if ((lp_map_to_guest() == MAP_TO_GUEST_ON_BAD_USER) ||
37 (lp_map_to_guest() == MAP_TO_GUEST_ON_BAD_PASSWORD)) {
38 DEBUG(3,("No such user %s [%s] - using guest account\n",
40 make_server_info_guest(server_info);
41 status = NT_STATUS_OK;
45 if (NT_STATUS_EQUAL(status, NT_STATUS_WRONG_PASSWORD)) {
46 if (lp_map_to_guest() == MAP_TO_GUEST_ON_BAD_PASSWORD) {
47 DEBUG(3,("Registered username %s for guest access\n",user));
48 make_server_info_guest(server_info);
49 status = NT_STATUS_OK;
57 /****************************************************************************
58 Add the standard 'Samba' signature to the end of the session setup.
59 ****************************************************************************/
60 static void add_signature(char *outbuf)
64 p += srvstr_push(outbuf, p, "Unix", -1, STR_TERMINATE);
65 p += srvstr_push(outbuf, p, "Samba", -1, STR_TERMINATE);
66 p += srvstr_push(outbuf, p, lp_workgroup(), -1, STR_TERMINATE);
67 set_message_end(outbuf,p);
70 /****************************************************************************
71 Do a 'guest' logon, getting back the
72 ****************************************************************************/
73 static NTSTATUS check_guest_password(auth_serversupplied_info **server_info)
75 struct auth_context *auth_context;
76 auth_usersupplied_info *user_info = NULL;
79 unsigned char chal[8];
83 DEBUG(3,("Got anonymous request\n"));
85 if (!NT_STATUS_IS_OK(nt_status = make_auth_context_fixed(&auth_context, chal))) {
89 if (!make_user_info_guest(&user_info)) {
90 (auth_context->free)(&auth_context);
91 return NT_STATUS_NO_MEMORY;
94 nt_status = auth_context->check_ntlm_password(auth_context, user_info, server_info);
95 (auth_context->free)(&auth_context);
96 free_user_info(&user_info);
102 /****************************************************************************
103 reply to a session setup spnego negotiate packet for kerberos
104 ****************************************************************************/
105 static int reply_spnego_kerberos(connection_struct *conn,
106 char *inbuf, char *outbuf,
107 int length, int bufsize,
112 const struct passwd *pw;
117 auth_serversupplied_info *server_info = NULL;
120 if (!spnego_parse_krb5_wrap(*secblob, &ticket)) {
121 return ERROR_NT(NT_STATUS_LOGON_FAILURE);
124 ads = ads_init(NULL, NULL, NULL, NULL);
126 ret = ads_verify_ticket(ads, &ticket, &client, &auth_data);
127 if (!NT_STATUS_IS_OK(ret)) {
128 DEBUG(1,("Failed to verify incoming ticket!\n"));
130 return ERROR_NT(NT_STATUS_LOGON_FAILURE);
133 DEBUG(3,("Ticket name is [%s]\n", client));
135 p = strchr_m(client, '@');
137 DEBUG(3,("Doesn't look like a valid principal\n"));
139 return ERROR_NT(NT_STATUS_LOGON_FAILURE);
143 if (strcasecmp(p+1, ads->realm) != 0) {
144 DEBUG(3,("Ticket for foreign realm %s@%s\n", client, p+1));
145 if (!lp_allow_trusted_domains()) {
146 return ERROR_NT(NT_STATUS_LOGON_FAILURE);
148 /* this gives a fully qualified user name (ie. with full realm).
149 that leads to very long usernames, but what else can we do? */
150 asprintf(&user, "%s%s%s", p+1, lp_winbind_separator(), client);
152 user = strdup(client);
156 /* the password is good - let them in */
157 pw = smb_getpwnam(user,False);
158 if (!pw && !strstr(user, lp_winbind_separator())) {
160 /* try it with a winbind domain prefix */
161 asprintf(&user2, "%s%s%s", lp_workgroup(), lp_winbind_separator(), user);
162 pw = smb_getpwnam(user2,False);
170 DEBUG(1,("Username %s is invalid on this system\n",user));
171 return ERROR_NT(NT_STATUS_NO_SUCH_USER);
174 if (!make_server_info_pw(&server_info,pw)) {
175 DEBUG(1,("make_server_info_from_pw failed!\n"));
176 return ERROR_NT(NT_STATUS_NO_MEMORY);
179 sess_vuid = register_vuid(server_info, user);
182 free_server_info(&server_info);
184 if (sess_vuid == -1) {
185 return ERROR_NT(NT_STATUS_LOGON_FAILURE);
188 set_message(outbuf,4,0,True);
189 SSVAL(outbuf, smb_vwv3, 0);
190 add_signature(outbuf);
192 SSVAL(outbuf,smb_uid,sess_vuid);
193 SSVAL(inbuf,smb_uid,sess_vuid);
195 return chain_reply(inbuf,outbuf,length,bufsize);
200 /****************************************************************************
201 send a security blob via a session setup reply
202 ****************************************************************************/
203 static BOOL reply_sesssetup_blob(connection_struct *conn, char *outbuf,
208 set_message(outbuf,4,0,True);
210 /* we set NT_STATUS_MORE_PROCESSING_REQUIRED to tell the other end
211 that we aren't finished yet */
213 SIVAL(outbuf, smb_rcls, NT_STATUS_V(NT_STATUS_MORE_PROCESSING_REQUIRED));
214 SSVAL(outbuf, smb_vwv0, 0xFF); /* no chaining possible */
215 SSVAL(outbuf, smb_vwv3, blob.length);
217 memcpy(p, blob.data, blob.length);
219 p += srvstr_push(outbuf, p, "Unix", -1, STR_TERMINATE);
220 p += srvstr_push(outbuf, p, "Samba", -1, STR_TERMINATE);
221 p += srvstr_push(outbuf, p, lp_workgroup(), -1, STR_TERMINATE);
222 set_message_end(outbuf,p);
224 return send_smb(smbd_server_fd(),outbuf);
227 /****************************************************************************
228 reply to a session setup spnego negotiate packet
229 ****************************************************************************/
230 static int reply_spnego_negotiate(connection_struct *conn,
233 int length, int bufsize,
236 char *OIDs[ASN1_MAX_OIDS];
239 uint32 ntlmssp_command, neg_flags;
240 DATA_BLOB sess_key, chal, spnego_chal;
241 const uint8 *cryptkey;
242 BOOL got_kerberos = False;
245 /* parse out the OIDs and the first sec blob */
246 if (!parse_negTokenTarg(blob1, OIDs, &secblob)) {
247 return ERROR_NT(NT_STATUS_LOGON_FAILURE);
250 for (i=0;OIDs[i];i++) {
251 DEBUG(3,("Got OID %s\n", OIDs[i]));
252 if (strcmp(OID_KERBEROS5, OIDs[i]) == 0 ||
253 strcmp(OID_KERBEROS5_OLD, OIDs[i]) == 0) {
258 DEBUG(3,("Got secblob of size %d\n", secblob.length));
262 int ret = reply_spnego_kerberos(conn, inbuf, outbuf,
263 length, bufsize, &secblob);
264 data_blob_free(&secblob);
269 /* parse the NTLMSSP packet */
271 file_save("secblob.dat", secblob.data, secblob.length);
274 if (!msrpc_parse(&secblob, "CddB",
279 return ERROR_NT(NT_STATUS_LOGON_FAILURE);
282 data_blob_free(&secblob);
283 data_blob_free(&sess_key);
285 if (ntlmssp_command != NTLMSSP_NEGOTIATE) {
286 return ERROR_NT(NT_STATUS_LOGON_FAILURE);
289 DEBUG(3,("Got neg_flags=%08x\n", neg_flags));
291 if (ntlmssp_auth_context) {
292 (ntlmssp_auth_context->free)(&ntlmssp_auth_context);
295 if (!NT_STATUS_IS_OK(nt_status = make_auth_context_subsystem(&ntlmssp_auth_context))) {
296 return ERROR_NT(nt_status);
299 cryptkey = ntlmssp_auth_context->get_ntlm_challenge(ntlmssp_auth_context);
301 /* Give them the challenge. For now, ignore neg_flags and just
302 return the flags we want. Obviously this is not correct */
304 neg_flags = NTLMSSP_NEGOTIATE_UNICODE |
305 NTLMSSP_NEGOTIATE_LM_KEY |
306 NTLMSSP_NEGOTIATE_NTLM;
308 msrpc_gen(&chal, "Cddddbdddd",
318 if (!spnego_gen_challenge(&spnego_chal, &chal, &chal)) {
319 DEBUG(3,("Failed to generate challenge\n"));
320 return ERROR_NT(NT_STATUS_LOGON_FAILURE);
323 /* now tell the client to send the auth packet */
324 reply_sesssetup_blob(conn, outbuf, spnego_chal);
326 data_blob_free(&chal);
327 data_blob_free(&spnego_chal);
329 /* and tell smbd that we have already replied to this packet */
334 /****************************************************************************
335 reply to a session setup spnego auth packet
336 ****************************************************************************/
337 static int reply_spnego_auth(connection_struct *conn, char *inbuf, char *outbuf,
338 int length, int bufsize,
342 char *workgroup = NULL, *user = NULL, *machine = NULL;
343 DATA_BLOB lmhash, nthash, sess_key;
344 DATA_BLOB plaintext_password = data_blob(NULL, 0);
345 uint32 ntlmssp_command, neg_flags;
349 uint32 auth_flags = AUTH_FLAG_NONE;
351 auth_usersupplied_info *user_info = NULL;
352 auth_serversupplied_info *server_info = NULL;
354 if (!spnego_parse_auth(blob1, &auth)) {
356 file_save("auth.dat", blob1.data, blob1.length);
358 return ERROR_NT(NT_STATUS_LOGON_FAILURE);
361 /* now the NTLMSSP encoded auth hashes */
362 if (!msrpc_parse(&auth, "CdBBUUUBd",
372 return ERROR_NT(NT_STATUS_LOGON_FAILURE);
375 data_blob_free(&auth);
376 data_blob_free(&sess_key);
378 DEBUG(3,("Got user=[%s] workgroup=[%s] machine=[%s] len1=%d len2=%d\n",
379 user, workgroup, machine, lmhash.length, nthash.length));
382 file_save("nthash1.dat", nthash.data, nthash.length);
383 file_save("lmhash1.dat", lmhash.data, lmhash.length);
387 auth_flags |= AUTH_FLAG_LM_RESP;
390 if (nthash.length == 24) {
391 auth_flags |= AUTH_FLAG_NTLM_RESP;
392 } else if (nthash.length > 24) {
393 auth_flags |= AUTH_FLAG_NTLMv2_RESP;
396 if (!make_user_info_map(&user_info,
402 return ERROR_NT(NT_STATUS_NO_MEMORY);
405 nt_status = ntlmssp_auth_context->check_ntlm_password(ntlmssp_auth_context, user_info, &server_info);
407 if (!NT_STATUS_IS_OK(nt_status)) {
408 nt_status = do_map_to_guest(nt_status, &server_info, user, workgroup);
411 SAFE_FREE(workgroup);
414 (ntlmssp_auth_context->free)(&ntlmssp_auth_context);
416 free_user_info(&user_info);
418 data_blob_free(&lmhash);
420 data_blob_free(&nthash);
422 if (!NT_STATUS_IS_OK(nt_status)) {
424 return ERROR_NT(nt_status_squash(nt_status));
427 as_guest = server_info->guest;
429 sess_vuid = register_vuid(server_info, user);
430 free_server_info(&server_info);
434 if (sess_vuid == -1) {
435 return ERROR_NT(NT_STATUS_LOGON_FAILURE);
438 set_message(outbuf,4,0,True);
439 SSVAL(outbuf, smb_vwv3, 0);
442 SSVAL(outbuf,smb_vwv2,1);
445 add_signature(outbuf);
447 SSVAL(outbuf,smb_uid,sess_vuid);
448 SSVAL(inbuf,smb_uid,sess_vuid);
450 return chain_reply(inbuf,outbuf,length,bufsize);
454 /****************************************************************************
455 reply to a session setup spnego anonymous packet
456 ****************************************************************************/
457 static int reply_spnego_anonymous(connection_struct *conn, char *inbuf, char *outbuf,
458 int length, int bufsize)
461 auth_serversupplied_info *server_info = NULL;
464 nt_status = check_guest_password(&server_info);
466 if (!NT_STATUS_IS_OK(nt_status)) {
467 return ERROR_NT(nt_status_squash(nt_status));
470 sess_vuid = register_vuid(server_info, lp_guestaccount());
472 free_server_info(&server_info);
474 if (sess_vuid == -1) {
475 return ERROR_NT(NT_STATUS_LOGON_FAILURE);
478 set_message(outbuf,4,0,True);
479 SSVAL(outbuf, smb_vwv3, 0);
480 add_signature(outbuf);
482 SSVAL(outbuf,smb_uid,sess_vuid);
483 SSVAL(inbuf,smb_uid,sess_vuid);
485 return chain_reply(inbuf,outbuf,length,bufsize);
489 /****************************************************************************
490 reply to a session setup command
491 ****************************************************************************/
492 static int reply_sesssetup_and_X_spnego(connection_struct *conn, char *inbuf,char *outbuf,
493 int length,int bufsize)
499 DEBUG(3,("Doing spnego session setup\n"));
501 if (global_client_caps == 0) {
502 global_client_caps = IVAL(inbuf,smb_vwv10);
505 p = (uint8 *)smb_buf(inbuf);
507 if (SVAL(inbuf, smb_vwv7) == 0) {
508 /* an anonymous request */
509 return reply_spnego_anonymous(conn, inbuf, outbuf, length, bufsize);
512 /* pull the spnego blob */
513 blob1 = data_blob(p, SVAL(inbuf, smb_vwv7));
516 file_save("negotiate.dat", blob1.data, blob1.length);
519 if (blob1.data[0] == ASN1_APPLICATION(0)) {
520 /* its a negTokenTarg packet */
521 ret = reply_spnego_negotiate(conn, inbuf, outbuf, length, bufsize, blob1);
522 data_blob_free(&blob1);
526 if (blob1.data[0] == ASN1_CONTEXT(1)) {
527 /* its a auth packet */
528 ret = reply_spnego_auth(conn, inbuf, outbuf, length, bufsize, blob1);
529 data_blob_free(&blob1);
533 /* what sort of packet is this? */
534 DEBUG(1,("Unknown packet in reply_sesssetup_and_X_spnego\n"));
536 data_blob_free(&blob1);
538 return ERROR_NT(NT_STATUS_LOGON_FAILURE);
542 /****************************************************************************
543 reply to a session setup command
544 ****************************************************************************/
545 int reply_sesssetup_and_X(connection_struct *conn, char *inbuf,char *outbuf,
546 int length,int bufsize)
552 DATA_BLOB plaintext_password;
554 pstring sub_user; /* Sainitised username for substituion */
557 fstring native_lanman;
558 static BOOL done_sesssetup = False;
559 extern BOOL global_encrypted_passwords_negotiated;
560 extern BOOL global_spnego_negotiated;
562 extern fstring remote_machine;
563 extern userdom_struct current_user_info;
566 auth_usersupplied_info *user_info = NULL;
567 extern struct auth_context *negprot_global_auth_context;
568 auth_serversupplied_info *server_info = NULL;
572 BOOL doencrypt = global_encrypted_passwords_negotiated;
574 START_PROFILE(SMBsesssetupX);
576 ZERO_STRUCT(lm_resp);
577 ZERO_STRUCT(nt_resp);
578 ZERO_STRUCT(plaintext_password);
580 DEBUG(3,("wct=%d flg2=0x%x\n", CVAL(inbuf, smb_wct), SVAL(inbuf, smb_flg2)));
582 /* a SPNEGO session setup has 12 command words, whereas a normal
583 NT1 session setup has 13. See the cifs spec. */
584 if (CVAL(inbuf, smb_wct) == 12 &&
585 (SVAL(inbuf, smb_flg2) & FLAGS2_EXTENDED_SECURITY)) {
586 if (!global_spnego_negotiated) {
587 DEBUG(0,("reply_sesssetup_and_X: Rejecting attempt at SPNEGO session setup when it was not negoitiated.\n"));
588 return ERROR_NT(NT_STATUS_UNSUCCESSFUL);
591 return reply_sesssetup_and_X_spnego(conn, inbuf, outbuf, length, bufsize);
594 smb_bufsize = SVAL(inbuf,smb_vwv2);
596 if (Protocol < PROTOCOL_NT1) {
597 uint16 passlen1 = SVAL(inbuf,smb_vwv7);
598 if (passlen1 > MAX_PASS_LEN) {
599 return ERROR_DOS(ERRDOS,ERRbuftoosmall);
603 lm_resp = data_blob(smb_buf(inbuf), passlen1);
605 plaintext_password = data_blob(smb_buf(inbuf), passlen1+1);
606 /* Ensure null termination */
607 plaintext_password.data[passlen1] = 0;
610 srvstr_pull(inbuf, user, smb_buf(inbuf)+passlen1, sizeof(user), -1, STR_TERMINATE);
614 uint16 passlen1 = SVAL(inbuf,smb_vwv7);
615 uint16 passlen2 = SVAL(inbuf,smb_vwv8);
616 enum remote_arch_types ra_type = get_remote_arch();
617 char *p = smb_buf(inbuf);
619 if(global_client_caps == 0)
620 global_client_caps = IVAL(inbuf,smb_vwv11);
622 /* client_caps is used as final determination if client is NT or Win95.
623 This is needed to return the correct error codes in some
627 if(ra_type == RA_WINNT || ra_type == RA_WIN2K || ra_type == RA_WIN95) {
628 if(!(global_client_caps & (CAP_NT_SMBS | CAP_STATUS32))) {
629 set_remote_arch( RA_WIN95);
633 if (passlen1 > MAX_PASS_LEN) {
634 return ERROR_DOS(ERRDOS,ERRbuftoosmall);
637 passlen1 = MIN(passlen1, MAX_PASS_LEN);
638 passlen2 = MIN(passlen2, MAX_PASS_LEN);
641 /* both Win95 and WinNT stuff up the password lengths for
642 non-encrypting systems. Uggh.
644 if passlen1==24 its a win95 system, and its setting the
645 password length incorrectly. Luckily it still works with the
646 default code because Win95 will null terminate the password
649 if passlen1>0 and passlen2>0 then maybe its a NT box and its
650 setting passlen2 to some random value which really stuffs
651 things up. we need to fix that one. */
653 if (passlen1 > 0 && passlen2 > 0 && passlen2 != 24 && passlen2 != 1)
657 /* Save the lanman2 password and the NT md4 password. */
659 if ((doencrypt) && (passlen1 != 0) && (passlen1 != 24)) {
664 lm_resp = data_blob(p, passlen1);
665 nt_resp = data_blob(p+passlen1, passlen2);
667 plaintext_password = data_blob(p, passlen1+1);
668 /* Ensure null termination */
669 plaintext_password.data[passlen1] = 0;
672 p += passlen1 + passlen2;
673 p += srvstr_pull(inbuf, user, p, sizeof(user), -1,
675 p += srvstr_pull(inbuf, domain, p, sizeof(domain),
677 p += srvstr_pull(inbuf, native_os, p, sizeof(native_os),
679 p += srvstr_pull(inbuf, native_lanman, p, sizeof(native_lanman),
681 DEBUG(3,("Domain=[%s] NativeOS=[%s] NativeLanMan=[%s]\n",
682 domain,native_os,native_lanman));
685 /* don't allow for weird usernames or domains */
686 alpha_strcpy(user, user, ". _-$", sizeof(user));
687 alpha_strcpy(domain, domain, ". _-", sizeof(domain));
688 if (strstr(user, "..") || strstr(domain,"..")) {
689 return ERROR_NT(NT_STATUS_LOGON_FAILURE);
692 DEBUG(3,("sesssetupX:name=[%s]\\[%s]@[%s]\n", domain, user, remote_machine));
695 if (global_spnego_negotiated) {
697 /* This has to be here, becouse this is a perfectly valid behaviour for guest logons :-( */
699 DEBUG(0,("reply_sesssetup_and_X: Rejecting attempt at 'normal' session setup after negotiating spnego.\n"));
700 return ERROR_NT(NT_STATUS_UNSUCCESSFUL);
702 pstrcpy(sub_user, user);
704 pstrcpy(sub_user, lp_guestaccount());
707 pstrcpy(current_user_info.smb_name,sub_user);
709 reload_services(True);
711 if (lp_security() == SEC_SHARE) {
712 /* in share level we should ignore any passwords */
714 data_blob_free(&lm_resp);
715 data_blob_free(&nt_resp);
716 data_blob_clear_free(&plaintext_password);
718 map_username(sub_user);
719 add_session_user(sub_user);
720 /* Then force it to null for the benfit of the code below */
726 nt_status = check_guest_password(&server_info);
728 } else if (doencrypt) {
729 if (!make_user_info_for_reply_enc(&user_info,
732 nt_status = NT_STATUS_NO_MEMORY;
734 nt_status = negprot_global_auth_context->check_ntlm_password(negprot_global_auth_context,
739 struct auth_context *plaintext_auth_context = NULL;
741 if (NT_STATUS_IS_OK(nt_status = make_auth_context_subsystem(&plaintext_auth_context))) {
742 chal = plaintext_auth_context->get_ntlm_challenge(plaintext_auth_context);
744 if (!make_user_info_for_reply(&user_info,
746 plaintext_password)) {
747 nt_status = NT_STATUS_NO_MEMORY;
750 if (NT_STATUS_IS_OK(nt_status)) {
751 nt_status = plaintext_auth_context->check_ntlm_password(plaintext_auth_context,
755 (plaintext_auth_context->free)(&plaintext_auth_context);
760 free_user_info(&user_info);
762 data_blob_free(&lm_resp);
763 data_blob_free(&nt_resp);
764 data_blob_clear_free(&plaintext_password);
766 if (!NT_STATUS_IS_OK(nt_status)) {
767 nt_status = do_map_to_guest(nt_status, &server_info, user, domain);
770 if (!NT_STATUS_IS_OK(nt_status)) {
771 return ERROR_NT(nt_status_squash(nt_status));
774 /* it's ok - setup a reply */
775 if (Protocol < PROTOCOL_NT1) {
776 set_message(outbuf,3,0,True);
778 set_message(outbuf,3,0,True);
779 add_signature(outbuf);
780 /* perhaps grab OS version here?? */
783 if (server_info->guest) {
784 SSVAL(outbuf,smb_vwv2,1);
787 /* register the name and uid as being validated, so further connections
788 to a uid can get through without a password, on the same VC */
790 sess_vuid = register_vuid(server_info, sub_user);
792 free_server_info(&server_info);
794 if (sess_vuid == -1) {
795 return ERROR_NT(NT_STATUS_LOGON_FAILURE);
799 SSVAL(outbuf,smb_uid,sess_vuid);
800 SSVAL(inbuf,smb_uid,sess_vuid);
803 max_send = MIN(max_send,smb_bufsize);
805 done_sesssetup = True;
807 END_PROFILE(SMBsesssetupX);
808 return chain_reply(inbuf,outbuf,length,bufsize);