4 Unix SMB/Netbios implementation.
6 Password and authentication handling
7 Copyright (C) Andrew Tridgell 1992-1998
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26 extern int DEBUGLEVEL;
28 extern struct in_addr ipzero;
30 /* users from session setup */
31 static pstring session_users="";
33 extern pstring global_myname;
34 extern fstring global_myworkgroup;
36 /* Data to do lanman1/2 password challenge. */
37 static unsigned char saved_challenge[8];
38 static BOOL challenge_sent=False;
40 /*******************************************************************
41 Get the next challenge value - no repeats.
42 ********************************************************************/
43 void generate_next_challenge(char *challenge)
47 * Leave this ifdef'd out while we test
48 * the new crypto random number generator.
51 unsigned char buf[16];
52 static int counter = 0;
56 /* get a sort-of random number */
58 v1 = (counter++) + sys_getpid() + tval.tv_sec;
59 v2 = (counter++) * sys_getpid() + tval.tv_usec;
60 SIVAL(challenge,0,v1);
61 SIVAL(challenge,4,v2);
63 /* mash it up with md4 */
64 mdfour(buf, (unsigned char *)challenge, 8);
68 generate_random_buffer(buf,8,False);
70 memcpy(saved_challenge, buf, 8);
71 memcpy(challenge,buf,8);
72 challenge_sent = True;
75 /*******************************************************************
76 set the last challenge sent, usually from a password server
77 ********************************************************************/
78 BOOL set_challenge(unsigned char *challenge)
80 memcpy(saved_challenge,challenge,8);
81 challenge_sent = True;
85 /*******************************************************************
86 get the last challenge sent
87 ********************************************************************/
88 static BOOL last_challenge(unsigned char *challenge)
90 if (!challenge_sent) return(False);
91 memcpy(challenge,saved_challenge,8);
95 /* this holds info on user ids that are already validated for this VC */
96 static user_struct *validated_users = NULL;
97 static int num_validated_users = 0;
99 /****************************************************************************
100 check if a uid has been validated, and return an pointer to the user_struct
101 if it has. NULL if not. vuid is biased by an offset. This allows us to
102 tell random client vuid's (normally zero) from valid vuids.
103 ****************************************************************************/
104 user_struct *get_valid_user_struct(uint16 vuid)
106 if (vuid == UID_FIELD_INVALID)
109 if ((vuid >= (uint16)num_validated_users) ||
110 (validated_users[vuid].uid == (uid_t)-1) || (validated_users[vuid].gid == (gid_t)-1))
112 return &validated_users[vuid];
115 /****************************************************************************
117 ****************************************************************************/
118 void invalidate_vuid(uint16 vuid)
120 user_struct *vuser = get_valid_user_struct(vuid);
125 vuser->uid = (uid_t)-1;
126 vuser->gid = (gid_t)-1;
128 /* same number of igroups as groups */
132 free((char *)vuser->groups);
134 vuser->groups = NULL;
136 delete_nt_token(&vuser->nt_user_token);
139 /****************************************************************************
140 return a validated username
141 ****************************************************************************/
142 char *validated_username(uint16 vuid)
144 user_struct *vuser = get_valid_user_struct(vuid);
147 return(vuser->user.unix_name);
150 /****************************************************************************
151 return a validated domain
152 ****************************************************************************/
153 char *validated_domain(uint16 vuid)
155 user_struct *vuser = get_valid_user_struct(vuid);
158 return(vuser->user.domain);
162 /****************************************************************************
163 Create the SID list for this user.
164 ****************************************************************************/
166 NT_USER_TOKEN *create_nt_token(uid_t uid, gid_t gid, int ngroups, gid_t *groups)
168 NT_USER_TOKEN *token;
172 if ((token = (NT_USER_TOKEN *)malloc( sizeof(NT_USER_TOKEN) ) ) == NULL)
177 if ((token->user_sids = (DOM_SID *)malloc( (ngroups + 2)*sizeof(DOM_SID))) == NULL) {
182 psids = token->user_sids;
186 uid_to_sid( &psids[0], uid);
187 gid_to_sid( &psids[1], gid);
189 for (i = 0; i < ngroups; i++) {
190 if (groups[i] != gid) {
191 gid_to_sid( &psids[psid_ndx+2], groups[i]);
200 /****************************************************************************
201 register a uid/name pair as being valid and that a valid password
202 has been given. vuid is biased by an offset. This allows us to
203 tell random client vuid's (normally zero) from valid vuids.
204 ****************************************************************************/
206 uint16 register_vuid(uid_t uid,gid_t gid, char *unix_name, char *requested_name,
207 char *domain,BOOL guest)
210 struct passwd *pwfile; /* for getting real name from passwd file */
212 /* Ensure no vuid gets registered in share level security. */
213 if(lp_security() == SEC_SHARE)
214 return UID_FIELD_INVALID;
216 validated_users = (user_struct *)Realloc(validated_users,
218 (num_validated_users+1));
220 if (!validated_users) {
221 DEBUG(0,("Failed to realloc users struct!\n"));
222 num_validated_users = 0;
223 return UID_FIELD_INVALID;
226 vuser = &validated_users[num_validated_users];
227 num_validated_users++;
231 vuser->guest = guest;
232 fstrcpy(vuser->user.unix_name,unix_name);
233 fstrcpy(vuser->user.smb_name,requested_name);
234 fstrcpy(vuser->user.domain,domain);
237 vuser->groups = NULL;
239 /* Find all the groups this uid is in and store them.
240 Used by become_user() */
241 initialise_groups(unix_name, uid, gid);
242 get_current_groups( &vuser->n_groups, &vuser->groups);
244 /* Create an NT_USER_TOKEN struct for this user. */
245 vuser->nt_user_token = create_nt_token(uid,gid, vuser->n_groups, vuser->groups);
247 DEBUG(3,("uid %d registered to name %s\n",(int)uid,unix_name));
249 DEBUG(3, ("Clearing default real name\n"));
250 fstrcpy(vuser->user.full_name, "<Full Name>");
251 if (lp_unix_realname()) {
252 if ((pwfile=sys_getpwnam(vuser->user.unix_name))!= NULL) {
253 DEBUG(3, ("User name: %s\tReal name: %s\n",vuser->user.unix_name,pwfile->pw_gecos));
254 fstrcpy(vuser->user.full_name, pwfile->pw_gecos);
258 memset(&vuser->dc, '\0', sizeof(vuser->dc));
260 return (uint16)((num_validated_users - 1) + VUID_OFFSET);
264 /****************************************************************************
265 add a name to the session users list
266 ****************************************************************************/
267 void add_session_user(char *user)
270 StrnCpy(suser,user,sizeof(suser)-1);
272 if (!Get_Pwnam(suser,True)) return;
274 if (suser && *suser && !in_list(suser,session_users,False))
276 if (strlen(suser) + strlen(session_users) + 2 >= sizeof(pstring))
277 DEBUG(1,("Too many session users??\n"));
280 pstrcat(session_users," ");
281 pstrcat(session_users,suser);
287 /****************************************************************************
288 update the encrypted smbpasswd file from the plaintext username and password
289 *****************************************************************************/
290 static BOOL update_smbpassword_file(char *user, char *password)
292 struct smb_passwd *smbpw;
296 smbpw = getsmbpwnam(user);
300 DEBUG(0,("getsmbpwnam returned NULL\n"));
305 * Remove the account disabled flag - we are updating the
306 * users password from a login.
308 smbpw->acct_ctrl &= ~ACB_DISABLED;
310 /* Here, the flag is one, because we want to ignore the
311 XXXXXXX'd out password */
312 ret = change_oem_password( smbpw, password, True);
314 DEBUG(3,("change_oem_password returned False\n"));
324 /****************************************************************************
325 core of smb password checking routine.
326 ****************************************************************************/
327 BOOL smb_password_check(char *password, unsigned char *part_passwd, unsigned char *c8)
329 /* Finish the encryption of part_passwd. */
330 unsigned char p21[21];
331 unsigned char p24[24];
333 if (part_passwd == NULL)
334 DEBUG(10,("No password set - allowing access\n"));
335 /* No password set - always true ! */
336 if (part_passwd == NULL)
340 memcpy(p21,part_passwd,16);
345 DEBUG(100,("Part password (P16) was |"));
346 for(i = 0; i < 16; i++)
347 DEBUG(100,("%X ", (unsigned char)part_passwd[i]));
349 DEBUG(100,("Password from client was |"));
350 for(i = 0; i < 24; i++)
351 DEBUG(100,("%X ", (unsigned char)password[i]));
353 DEBUG(100,("Given challenge was |"));
354 for(i = 0; i < 8; i++)
355 DEBUG(100,("%X ", (unsigned char)c8[i]));
357 DEBUG(100,("Value from encryption was |"));
358 for(i = 0; i < 24; i++)
359 DEBUG(100,("%X ", (unsigned char)p24[i]));
363 return (memcmp(p24, password, 24) == 0);
366 /****************************************************************************
367 Do a specific test for an smb password being correct, given a smb_password and
368 the lanman and NT responses.
369 ****************************************************************************/
370 BOOL smb_password_ok(struct smb_passwd *smb_pass, uchar chal[8],
371 uchar lm_pass[24], uchar nt_pass[24])
375 if (!lm_pass || !smb_pass) return(False);
377 DEBUG(4,("Checking SMB password for user %s\n",
378 smb_pass->smb_name));
380 if(smb_pass->acct_ctrl & ACB_DISABLED) {
381 DEBUG(1,("account for user %s was disabled.\n",
382 smb_pass->smb_name));
388 DEBUG(5,("use last SMBnegprot challenge\n"));
389 if (!last_challenge(challenge))
391 DEBUG(1,("no challenge done - password failed\n"));
397 DEBUG(5,("challenge received\n"));
398 memcpy(challenge, chal, 8);
401 if ((Protocol >= PROTOCOL_NT1) && (smb_pass->smb_nt_passwd != NULL)) {
402 /* We have the NT MD4 hash challenge available - see if we can
403 use it (ie. does it exist in the smbpasswd file).
405 DEBUG(4,("smb_password_ok: Checking NT MD4 password\n"));
406 if (smb_password_check((char *)nt_pass,
407 (uchar *)smb_pass->smb_nt_passwd,
409 DEBUG(4,("NT MD4 password check succeeded\n"));
412 DEBUG(4,("NT MD4 password check failed\n"));
415 /* Try against the lanman password. smb_pass->smb_passwd == NULL means
416 no password, allow access. */
418 DEBUG(4,("Checking LM MD4 password\n"));
420 if((smb_pass->smb_passwd == NULL) &&
421 (smb_pass->acct_ctrl & ACB_PWNOTREQ)) {
422 DEBUG(4,("no password required for user %s\n",
423 smb_pass->smb_name));
427 if((smb_pass->smb_passwd != NULL) &&
428 smb_password_check((char *)lm_pass,
429 (uchar *)smb_pass->smb_passwd, challenge)) {
430 DEBUG(4,("LM MD4 password check succeeded\n"));
434 DEBUG(4,("LM MD4 password check failed\n"));
440 /****************************************************************************
441 check if a username/password is OK assuming the password is a 24 byte
443 return True if the password is correct, False otherwise
444 ****************************************************************************/
446 BOOL pass_check_smb(char *user, char *domain,
447 uchar *chal, uchar *lm_pwd, uchar *nt_pwd,
451 struct smb_passwd *smb_pass;
453 if (!lm_pwd || !nt_pwd)
458 if (pwd != NULL && user == NULL)
460 pass = (struct passwd *) pwd;
461 user = pass->pw_name;
465 pass = smb_getpwnam(user,True);
470 DEBUG(1,("Couldn't find user '%s' in UNIX password database.\n",user));
474 smb_pass = getsmbpwnam(user);
476 if (smb_pass == NULL)
478 DEBUG(1,("Couldn't find user '%s' in smb_passwd file.\n", user));
482 /* Quit if the account was disabled. */
483 if(smb_pass->acct_ctrl & ACB_DISABLED) {
484 DEBUG(1,("Account for user '%s' was disabled.\n", user));
488 /* Ensure the uid's match */
489 if (smb_pass->smb_userid != pass->pw_uid)
491 DEBUG(0,("Error : UNIX and SMB uids in password files do not match for user '%s'!\n", user));
495 if (smb_pass->acct_ctrl & ACB_PWNOTREQ) {
496 if (lp_null_passwords()) {
497 DEBUG(3,("Account for user '%s' has no password and null passwords are allowed.\n", smb_pass->smb_name));
500 DEBUG(3,("Account for user '%s' has no password and null passwords are NOT allowed.\n", smb_pass->smb_name));
505 if (smb_password_ok(smb_pass, chal, lm_pwd, nt_pwd))
510 DEBUG(2,("pass_check_smb failed - invalid password for user [%s]\n", user));
514 /****************************************************************************
515 check if a username/password pair is OK either via the system password
516 database or the encrypted SMB password database
517 return True if the password is correct, False otherwise
518 ****************************************************************************/
519 BOOL password_ok(char *user, char *password, int pwlen, struct passwd *pwd)
521 if (pwlen == 24 || (lp_encrypted_passwords() && (pwlen == 0) && lp_null_passwords()))
523 /* if 24 bytes long assume it is an encrypted password */
526 if (!last_challenge(challenge))
528 DEBUG(0,("Error: challenge not done for user=%s\n", user));
532 return pass_check_smb(user, global_myworkgroup,
533 challenge, (uchar *)password, (uchar *)password, pwd);
536 return pass_check(user, password, pwlen, pwd,
537 lp_update_encrypted() ?
538 update_smbpassword_file : NULL);
541 /****************************************************************************
542 check if a username is valid
543 ****************************************************************************/
544 BOOL user_ok(char *user,int snum)
546 pstring valid, invalid;
549 StrnCpy(valid, lp_valid_users(snum), sizeof(pstring)-1);
550 StrnCpy(invalid, lp_invalid_users(snum), sizeof(pstring)-1);
552 pstring_sub(valid,"%S",lp_servicename(snum));
553 pstring_sub(invalid,"%S",lp_servicename(snum));
555 ret = !user_in_list(user,invalid);
557 if (ret && valid && *valid) {
558 ret = user_in_list(user,valid);
561 if (ret && lp_onlyuser(snum)) {
562 char *user_list = lp_username(snum);
563 pstring_sub(user_list,"%S",lp_servicename(snum));
564 ret = user_in_list(user,user_list);
573 /****************************************************************************
574 validate a group username entry. Return the username or NULL
575 ****************************************************************************/
576 static char *validate_group(char *group,char *password,int pwlen,int snum)
580 char *host, *user, *domain;
582 while (getnetgrent(&host, &user, &domain)) {
584 if (user_ok(user, snum) &&
585 password_ok(user,password,pwlen,NULL)) {
599 while ((gptr = (struct group *)getgrent())) {
600 if (strequal(gptr->gr_name,group))
605 * As user_ok can recurse doing a getgrent(), we must
606 * copy the member list into a pstring on the stack before
607 * use. Bug pointed out by leon@eatworms.swmed.edu.
613 size_t copied_len = 0;
617 member = member_list;
619 for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
620 size_t member_len = strlen(gptr->gr_mem[i]) + 1;
621 if( copied_len + member_len < sizeof(pstring)) {
623 DEBUG(10,("validate_group: = gr_mem = %s\n", gptr->gr_mem[i]));
625 safe_strcpy(member, gptr->gr_mem[i], sizeof(pstring) - copied_len - 1);
626 copied_len += member_len;
627 member += copied_len;
635 member = member_list;
638 fstrcpy(name,member);
639 if (user_ok(name,snum) &&
640 password_ok(name,password,pwlen,NULL)) {
645 DEBUG(10,("validate_group = member = %s\n", member));
647 member += strlen(member) + 1;
660 /****************************************************************************
661 check for authority to login to a service with a given username/password
662 ****************************************************************************/
663 BOOL authorise_login(int snum,char *user,char *password, int pwlen,
664 BOOL *guest,BOOL *force,uint16 vuid)
671 DEBUG(100,("checking authorisation on user=%s pass=%s\n",user,password));
674 /* there are several possibilities:
675 1) login as the given user with given password
676 2) login as a previously registered username with the given password
677 3) login as a session list username with the given password
678 4) login as a previously validated user/password pair
679 5) login as the "user =" user with given password
680 6) login as the "user =" user with no password (guest connection)
681 7) login as guest user with no password
683 if the service is guest_only then steps 1 to 5 are skipped
686 if (GUEST_ONLY(snum)) *force = True;
688 if (!(GUEST_ONLY(snum) && GUEST_OK(snum)))
691 user_struct *vuser = get_valid_user_struct(vuid);
693 /* check the given username and password */
694 if (!ok && (*user) && user_ok(user,snum)) {
695 ok = password_ok(user,password, pwlen, NULL);
696 if (ok) DEBUG(3,("ACCEPTED: given username password ok\n"));
699 /* check for a previously registered guest username */
700 if (!ok && (vuser != 0) && vuser->guest) {
701 if (user_ok(vuser->user.unix_name,snum) &&
702 password_ok(vuser->user.unix_name, password, pwlen, NULL)) {
703 fstrcpy(user, vuser->user.unix_name);
704 vuser->guest = False;
705 DEBUG(3,("ACCEPTED: given password with registered user %s\n", user));
711 /* now check the list of session users */
715 char *user_list = strdup(session_users);
716 if (!user_list) return(False);
718 for (auser=strtok(user_list,LIST_SEP);
720 auser = strtok(NULL,LIST_SEP))
723 fstrcpy(user2,auser);
724 if (!user_ok(user2,snum)) continue;
726 if (password_ok(user2,password, pwlen, NULL)) {
729 DEBUG(3,("ACCEPTED: session list username and given password ok\n"));
735 /* check for a previously validated username/password pair */
736 if (!ok && (lp_security() > SEC_SHARE) &&
737 (vuser != 0) && !vuser->guest &&
738 user_ok(vuser->user.unix_name,snum)) {
739 fstrcpy(user,vuser->user.unix_name);
741 DEBUG(3,("ACCEPTED: validated uid ok as non-guest\n"));
745 /* check for a rhosts entry */
746 if (!ok && user_ok(user,snum) && check_hosts_equiv(user)) {
748 DEBUG(3,("ACCEPTED: hosts equiv or rhosts entry\n"));
751 /* check the user= fields and the given password */
752 if (!ok && lp_username(snum)) {
755 StrnCpy(user_list,lp_username(snum),sizeof(pstring));
757 pstring_sub(user_list,"%S",lp_servicename(snum));
759 for (auser=strtok(user_list,LIST_SEP);
761 auser = strtok(NULL,LIST_SEP))
765 auser = validate_group(auser+1,password,pwlen,snum);
770 DEBUG(3,("ACCEPTED: group username and given password ok\n"));
776 fstrcpy(user2,auser);
777 if (user_ok(user2,snum) &&
778 password_ok(user2,password,pwlen,NULL))
782 DEBUG(3,("ACCEPTED: user list username and given password ok\n"));
787 } /* not guest only */
789 /* check for a normal guest connection */
790 if (!ok && GUEST_OK(snum))
793 StrnCpy(guestname,lp_guestaccount(snum),sizeof(guestname)-1);
794 if (Get_Pwnam(guestname,True))
796 fstrcpy(user,guestname);
798 DEBUG(3,("ACCEPTED: guest account and guest ok\n"));
801 DEBUG(0,("Invalid guest account %s??\n",guestname));
805 if (ok && !user_ok(user,snum))
807 DEBUG(0,("rejected invalid user %s\n",user));
815 /****************************************************************************
816 read the a hosts.equiv or .rhosts file and check if it
817 allows this user from this machine
818 ****************************************************************************/
819 static BOOL check_user_equiv(char *user, char *remote, char *equiv_file)
821 int plus_allowed = 1;
824 char **lines = file_lines_load(equiv_file, NULL);
827 DEBUG(5, ("check_user_equiv %s %s %s\n", user, remote, equiv_file));
828 if (! lines) return False;
829 for (i=0; lines[i]; i++) {
830 char *buf = lines[i];
831 trim_string(buf," "," ");
833 if (buf[0] != '#' && buf[0] != '\n')
835 BOOL is_group = False;
838 if (strcmp(buf, "NO_PLUS\n") == 0)
840 DEBUG(6, ("check_user_equiv NO_PLUS\n"));
847 if (*bp == '\n' && plus_allowed)
849 /* a bare plus means everbody allowed */
850 DEBUG(6, ("check_user_equiv everybody allowed\n"));
851 file_lines_free(lines);
855 else if (buf[0] == '-')
865 file_host = strtok(bp, " \t\n");
866 file_user = strtok(NULL, " \t\n");
867 DEBUG(7, ("check_user_equiv %s %s\n", file_host ? file_host : "(null)",
868 file_user ? file_user : "(null)" ));
869 if (file_host && *file_host)
871 BOOL host_ok = False;
873 #if defined(HAVE_NETGROUP) && defined(HAVE_YP_GET_DEFAULT_DOMAIN)
876 static char *mydomain = NULL;
878 yp_get_default_domain(&mydomain);
879 if (mydomain && innetgr(file_host,remote,user,mydomain))
885 DEBUG(1,("Netgroups not configured\n"));
890 /* is it this host */
891 /* the fact that remote has come from a call of gethostbyaddr
892 * means that it may have the fully qualified domain name
893 * so we could look up the file version to get it into
894 * a canonical form, but I would rather just type it
895 * in full in the equiv file
897 if (!host_ok && !is_group && strequal(remote, file_host))
903 /* is it this user */
904 if (file_user == 0 || strequal(user, file_user))
906 DEBUG(5, ("check_user_equiv matched %s%s %s\n",
907 (plus ? "+" : "-"), file_host,
908 (file_user ? file_user : "")));
909 file_lines_free(lines);
910 return (plus ? True : False);
916 file_lines_free(lines);
921 /****************************************************************************
922 check for a possible hosts equiv or rhosts entry for the user
923 ****************************************************************************/
924 BOOL check_hosts_equiv(char *user)
928 struct passwd *pass = Get_Pwnam(user,True);
933 fname = lp_hosts_equiv();
935 /* note: don't allow hosts.equiv on root */
936 if (fname && *fname && (pass->pw_uid != 0)) {
937 if (check_user_equiv(user,client_name(),fname))
943 char *home = get_user_home_dir(user);
945 slprintf(rhostsfile, sizeof(rhostsfile)-1, "%s/.rhosts", home);
946 if (check_user_equiv(user,client_name(),rhostsfile))
955 /****************************************************************************
956 Return the client state structure.
957 ****************************************************************************/
959 struct cli_state *server_client(void)
961 static struct cli_state pw_cli;
965 /****************************************************************************
966 Support for server level security.
967 ****************************************************************************/
969 struct cli_state *server_cryptkey(void)
971 struct cli_state *cli;
973 struct in_addr dest_ip;
975 BOOL connected_ok = False;
977 cli = server_client();
979 if (!cli_initialise(cli))
982 pserver = strdup(lp_passwordserver());
985 while(next_token( &p, desthost, LIST_SEP, sizeof(desthost))) {
986 standard_sub_basic(desthost);
989 if(!resolve_name( desthost, &dest_ip, 0x20)) {
990 DEBUG(1,("server_cryptkey: Can't resolve address for %s\n",desthost));
994 if (ismyip(dest_ip)) {
995 DEBUG(1,("Password server loop - disabling password server %s\n",desthost));
999 if (cli_connect(cli, desthost, &dest_ip)) {
1000 DEBUG(3,("connected to password server %s\n",desthost));
1001 connected_ok = True;
1008 if (!connected_ok) {
1009 DEBUG(0,("password server not available\n"));
1014 if (!attempt_netbios_session_request(cli, global_myname, desthost, &dest_ip))
1017 DEBUG(3,("got session\n"));
1019 if (!cli_negprot(cli)) {
1020 DEBUG(1,("%s rejected the negprot\n",desthost));
1025 if (cli->protocol < PROTOCOL_LANMAN2 ||
1026 !(cli->sec_mode & 1)) {
1027 DEBUG(1,("%s isn't in user level security mode\n",desthost));
1032 DEBUG(3,("password server OK\n"));
1037 /****************************************************************************
1038 Validate a password with the password server.
1039 ****************************************************************************/
1041 BOOL server_validate(char *user, char *domain,
1042 char *pass, int passlen,
1043 char *ntpass, int ntpasslen)
1045 struct cli_state *cli;
1046 static unsigned char badpass[24];
1047 static BOOL tested_password_server = False;
1048 static BOOL bad_password_server = False;
1050 cli = server_client();
1052 if (!cli->initialised) {
1053 DEBUG(1,("password server %s is not connected\n", cli->desthost));
1058 memset(badpass, 0x1f, sizeof(badpass));
1060 if((passlen == sizeof(badpass)) && !memcmp(badpass, pass, passlen)) {
1062 * Very unlikely, our random bad password is the same as the users
1064 memset(badpass, badpass[0]+1, sizeof(badpass));
1068 * Attempt a session setup with a totally incorrect password.
1069 * If this succeeds with the guest bit *NOT* set then the password
1070 * server is broken and is not correctly setting the guest bit. We
1071 * need to detect this as some versions of NT4.x are broken. JRA.
1074 if(!tested_password_server) {
1075 if (cli_session_setup(cli, user, (char *)badpass, sizeof(badpass),
1076 (char *)badpass, sizeof(badpass), domain)) {
1079 * We connected to the password server so we
1080 * can say we've tested it.
1082 tested_password_server = True;
1084 if ((SVAL(cli->inbuf,smb_vwv2) & 1) == 0) {
1085 DEBUG(0,("server_validate: password server %s allows users as non-guest \
1086 with a bad password.\n", cli->desthost));
1087 DEBUG(0,("server_validate: This is broken (and insecure) behaviour. Please do not \
1088 use this machine as the password server.\n"));
1092 * Password server has the bug.
1094 bad_password_server = True;
1102 * We have already tested the password server.
1103 * Fail immediately if it has the bug.
1106 if(bad_password_server) {
1107 DEBUG(0,("server_validate: [1] password server %s allows users as non-guest \
1108 with a bad password.\n", cli->desthost));
1109 DEBUG(0,("server_validate: [1] This is broken (and insecure) behaviour. Please do not \
1110 use this machine as the password server.\n"));
1116 * Now we know the password server will correctly set the guest bit, or is
1117 * not guest enabled, we can try with the real password.
1120 if (!cli_session_setup(cli, user, pass, passlen, ntpass, ntpasslen, domain)) {
1121 DEBUG(1,("password server %s rejected the password\n", cli->desthost));
1125 /* if logged in as guest then reject */
1126 if ((SVAL(cli->inbuf,smb_vwv2) & 1) != 0) {
1127 DEBUG(1,("password server %s gave us guest only\n", cli->desthost));
1137 /***********************************************************************
1138 Connect to a remote machine for domain security authentication
1139 given a name or IP address.
1140 ************************************************************************/
1142 static BOOL connect_to_domain_password_server(struct cli_state *pcli, char *remote_machine,
1143 unsigned char *trust_passwd)
1145 struct in_addr dest_ip;
1147 if(cli_initialise(pcli) == False) {
1148 DEBUG(0,("connect_to_domain_password_server: unable to initialize client connection.\n"));
1152 standard_sub_basic(remote_machine);
1153 strupper(remote_machine);
1155 if(!resolve_name( remote_machine, &dest_ip, 0x20)) {
1156 DEBUG(1,("connect_to_domain_password_server: Can't resolve address for %s\n", remote_machine));
1161 if (ismyip(dest_ip)) {
1162 DEBUG(1,("connect_to_domain_password_server: Password server loop - not using password server %s\n",
1168 if (!cli_connect(pcli, remote_machine, &dest_ip)) {
1169 DEBUG(0,("connect_to_domain_password_server: unable to connect to SMB server on \
1170 machine %s. Error was : %s.\n", remote_machine, cli_errstr(pcli) ));
1175 if (!attempt_netbios_session_request(pcli, global_myname, remote_machine, &dest_ip)) {
1176 DEBUG(0,("connect_to_password_server: machine %s rejected the NetBIOS \
1177 session request. Error was : %s.\n", remote_machine, cli_errstr(pcli) ));
1181 pcli->protocol = PROTOCOL_NT1;
1183 if (!cli_negprot(pcli)) {
1184 DEBUG(0,("connect_to_domain_password_server: machine %s rejected the negotiate protocol. \
1185 Error was : %s.\n", remote_machine, cli_errstr(pcli) ));
1190 if (pcli->protocol != PROTOCOL_NT1) {
1191 DEBUG(0,("connect_to_domain_password_server: machine %s didn't negotiate NT protocol.\n",
1198 * Do an anonymous session setup.
1201 if (!cli_session_setup(pcli, "", "", 0, "", 0, "")) {
1202 DEBUG(0,("connect_to_domain_password_server: machine %s rejected the session setup. \
1203 Error was : %s.\n", remote_machine, cli_errstr(pcli) ));
1208 if (!(pcli->sec_mode & 1)) {
1209 DEBUG(1,("connect_to_domain_password_server: machine %s isn't in user level security mode\n",
1215 if (!cli_send_tconX(pcli, "IPC$", "IPC", "", 1)) {
1216 DEBUG(0,("connect_to_domain_password_server: machine %s rejected the tconX on the IPC$ share. \
1217 Error was : %s.\n", remote_machine, cli_errstr(pcli) ));
1223 * We now have an anonymous connection to IPC$ on the domain password server.
1227 * Even if the connect succeeds we need to setup the netlogon
1228 * pipe here. We do this as we may just have changed the domain
1229 * account password on the PDC and yet we may be talking to
1230 * a BDC that doesn't have this replicated yet. In this case
1231 * a successful connect to a DC needs to take the netlogon connect
1232 * into account also. This patch from "Bjart Kvarme" <bjart.kvarme@usit.uio.no>.
1235 if(cli_nt_session_open(pcli, PIPE_NETLOGON) == False) {
1236 DEBUG(0,("connect_to_domain_password_server: unable to open the domain client session to \
1237 machine %s. Error was : %s.\n", remote_machine, cli_errstr(pcli)));
1238 cli_nt_session_close(pcli);
1244 if (cli_nt_setup_creds(pcli, trust_passwd) == False) {
1245 DEBUG(0,("connect_to_domain_password_server: unable to setup the PDC credentials to machine \
1246 %s. Error was : %s.\n", remote_machine, cli_errstr(pcli)));
1247 cli_nt_session_close(pcli);
1256 /***********************************************************************
1257 Utility function to attempt a connection to an IP address of a DC.
1258 ************************************************************************/
1260 static BOOL attempt_connect_to_dc(struct cli_state *pcli, struct in_addr *ip, unsigned char *trust_passwd)
1265 * Ignore addresses we have already tried.
1268 if (ip_equal(ipzero, *ip))
1271 if (!lookup_pdc_name(global_myname, lp_workgroup(), ip, dc_name))
1274 return connect_to_domain_password_server(pcli, dc_name, trust_passwd);
1279 /***********************************************************************
1280 We have been asked to dynamcially determine the IP addresses of
1281 the PDC and BDC's for this DOMAIN, and query them in turn.
1282 ************************************************************************/
1283 static BOOL find_connect_pdc(struct cli_state *pcli, unsigned char *trust_passwd)
1285 struct in_addr *ip_list = NULL;
1288 BOOL connected_ok = False;
1290 if (!get_dc_list(lp_workgroup(), &ip_list, &count))
1294 * Firstly try and contact a PDC/BDC who has the same
1295 * network address as any of our interfaces.
1297 for(i = 0; i < count; i++) {
1298 if(!is_local_net(ip_list[i]))
1301 if((connected_ok = attempt_connect_to_dc(pcli, &ip_list[i], trust_passwd)))
1304 ip_list[i] = ipzero; /* Tried and failed. */
1308 * Secondly try and contact a random PDC/BDC.
1311 i = (sys_random() % count);
1313 if (!(connected_ok = attempt_connect_to_dc(pcli, &ip_list[i], trust_passwd)))
1314 ip_list[i] = ipzero; /* Tried and failed. */
1318 * Finally go through the IP list in turn, ignoring any addresses
1319 * we have already tried.
1323 * Try and connect to any of the other IP addresses in the PDC/BDC list.
1324 * Note that from a WINS server the #1 IP address is the PDC.
1326 for(i = 0; i < count; i++) {
1327 if((connected_ok = attempt_connect_to_dc(pcli, &ip_list[i], trust_passwd)))
1333 free((char *)ip_list);
1336 return connected_ok;
1341 /***********************************************************************
1342 Do the same as security=server, but using NT Domain calls and a session
1343 key from the machine password.
1344 ************************************************************************/
1346 BOOL domain_client_validate( char *user, char *domain,
1347 char *smb_apasswd, int smb_apasslen,
1348 char *smb_ntpasswd, int smb_ntpasslen,
1351 unsigned char local_challenge[8];
1352 unsigned char local_lm_response[24];
1353 unsigned char local_nt_response[24];
1354 unsigned char trust_passwd[16];
1355 fstring remote_machine;
1357 NET_ID_INFO_CTR ctr;
1358 NET_USER_INFO_3 info3;
1359 struct cli_state cli;
1361 BOOL connected_ok = False;
1363 if(user_exists != NULL)
1364 *user_exists = True; /* Only set false on a very specific error. */
1367 * Check that the requested domain is not our own machine name.
1368 * If it is, we should never check the PDC here, we use our own local
1372 if(strequal( domain, global_myname)) {
1373 DEBUG(3,("domain_client_validate: Requested domain was for this machine.\n"));
1378 * Next, check that the passwords given were encrypted.
1381 if(((smb_apasslen != 24) && (smb_apasslen != 0)) ||
1382 ((smb_ntpasslen != 24) && (smb_ntpasslen != 0))) {
1385 * Not encrypted - do so.
1388 DEBUG(3,("domain_client_validate: User passwords not in encrypted format.\n"));
1389 generate_random_buffer( local_challenge, 8, False);
1390 SMBencrypt( (uchar *)smb_apasswd, local_challenge, local_lm_response);
1391 SMBNTencrypt((uchar *)smb_ntpasswd, local_challenge, local_nt_response);
1394 smb_apasswd = (char *)local_lm_response;
1395 smb_ntpasswd = (char *)local_nt_response;
1399 * Encrypted - get the challenge we sent for these
1403 if (!last_challenge(local_challenge)) {
1404 DEBUG(0,("domain_client_validate: no challenge done - password failed\n"));
1410 * Get the machine account password for our primary domain
1412 if (!secrets_fetch_trust_account_password(lp_workgroup(), trust_passwd, NULL))
1418 * At this point, smb_apasswd points to the lanman response to
1419 * the challenge in local_challenge, and smb_ntpasswd points to
1420 * the NT response to the challenge in local_challenge. Ship
1421 * these over the secure channel to a domain controller and
1422 * see if they were valid.
1428 * Treat each name in the 'password server =' line as a potential
1429 * PDC/BDC. Contact each in turn and try and authenticate.
1432 pserver = lp_passwordserver();
1433 if (! *pserver) pserver = "*";
1436 while (!connected_ok &&
1437 next_token(&p,remote_machine,LIST_SEP,sizeof(remote_machine))) {
1438 if(strequal(remote_machine, "*")) {
1439 connected_ok = find_connect_pdc(&cli, trust_passwd);
1441 connected_ok = connect_to_domain_password_server(&cli, remote_machine, trust_passwd);
1445 if (!connected_ok) {
1446 DEBUG(0,("domain_client_validate: Domain password server not available.\n"));
1451 /* We really don't care what LUID we give the user. */
1452 generate_random_buffer( (unsigned char *)&smb_uid_low, 4, False);
1456 if(cli_nt_login_network(&cli, domain, user, smb_uid_low, (char *)local_challenge,
1457 ((smb_apasslen != 0) ? smb_apasswd : NULL),
1458 ((smb_ntpasslen != 0) ? smb_ntpasswd : NULL),
1459 &ctr, &info3) == False) {
1462 cli_error(&cli, NULL, NULL, &nt_rpc_err);
1463 DEBUG(0,("domain_client_validate: unable to validate password for user %s in domain \
1464 %s to Domain controller %s. Error was %s.\n", user, domain, remote_machine, cli_errstr(&cli)));
1465 cli_nt_session_close(&cli);
1469 if((nt_rpc_err == NT_STATUS_NO_SUCH_USER) && (user_exists != NULL))
1470 *user_exists = False;
1476 * Here, if we really want it, we have lots of info about the user in info3.
1481 * We don't actually need to do this - plus it fails currently with
1482 * NT_STATUS_INVALID_INFO_CLASS - we need to know *exactly* what to
1486 if(cli_nt_logoff(&cli, &ctr) == False) {
1487 DEBUG(0,("domain_client_validate: unable to log off user %s in domain \
1488 %s to Domain controller %s. Error was %s.\n", user, domain, remote_machine, cli_errstr(&cli)));
1489 cli_nt_session_close(&cli);
1496 /* Note - once the cli stream is shutdown the mem_ctx used
1497 to allocate the other_sids and gids structures has been deleted - so
1498 these pointers are no longer valid..... */
1500 cli_nt_session_close(&cli);