/* Unix SMB/Netbios implementation. Version 1.9. Password and authentication handling Copyright (C) Andrew Tridgell 1992-1998 This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include "includes.h" extern int DEBUGLEVEL; extern int Protocol; /* users from session setup */ static pstring session_users=""; extern pstring scope; extern pstring global_myname; extern fstring global_myworkgroup; /* Data to do lanman1/2 password challenge. */ static unsigned char saved_challenge[8]; static BOOL challenge_sent=False; /******************************************************************* Get the next challenge value - no repeats. ********************************************************************/ void generate_next_challenge(char *challenge) { #if 0 /* * Leave this ifdef'd out while we test * the new crypto random number generator. * JRA. */ unsigned char buf[16]; static int counter = 0; struct timeval tval; int v1,v2; /* get a sort-of random number */ GetTimeOfDay(&tval); v1 = (counter++) + getpid() + tval.tv_sec; v2 = (counter++) * getpid() + tval.tv_usec; SIVAL(challenge,0,v1); SIVAL(challenge,4,v2); /* mash it up with md4 */ mdfour(buf, (unsigned char *)challenge, 8); #else unsigned char buf[8]; generate_random_buffer(buf,8,False); #endif memcpy(saved_challenge, buf, 8); memcpy(challenge,buf,8); challenge_sent = True; } /******************************************************************* set the last challenge sent, usually from a password server ********************************************************************/ BOOL set_challenge(unsigned char *challenge) { memcpy(saved_challenge,challenge,8); challenge_sent = True; return(True); } /******************************************************************* get the last challenge sent ********************************************************************/ static BOOL last_challenge(unsigned char *challenge) { if (!challenge_sent) return False; memcpy(challenge,saved_challenge,8); return(True); } /* this holds info on user ids that are already validated for this VC */ static user_struct *validated_users = NULL; static int num_validated_users = 0; /**************************************************************************** check if a uid has been validated, and return an pointer to the user_struct if it has. NULL if not. vuid is biased by an offset. This allows us to tell random client vuid's (normally zero) from valid vuids. ****************************************************************************/ user_struct *get_valid_user_struct(uint16 vuid) { if (vuid == UID_FIELD_INVALID) return NULL; vuid -= VUID_OFFSET; if ((vuid >= (uint16)num_validated_users) || (validated_users[vuid].uid == (uid_t)-1) || (validated_users[vuid].gid == (gid_t)-1)) return NULL; return &validated_users[vuid]; } /**************************************************************************** invalidate a uid ****************************************************************************/ void invalidate_vuid(uint16 vuid) { user_struct *vuser = get_valid_user_struct(vuid); if (vuser == NULL) return; vuser->uid = (uid_t)-1; vuser->gid = (gid_t)-1; vuser->n_sids = 0; /* same number of igroups as groups */ vuser->n_groups = 0; if (vuser->groups) free((char *)vuser->groups); if (vuser->sids) free((char *)vuser->sids); vuser->sids = NULL; vuser->groups = NULL; } /**************************************************************************** return a validated username ****************************************************************************/ char *validated_username(uint16 vuid) { user_struct *vuser = get_valid_user_struct(vuid); if (vuser == NULL) return 0; return(vuser->name); } /**************************************************************************** register a uid/name pair as being valid and that a valid password has been given. vuid is biased by an offset. This allows us to tell random client vuid's (normally zero) from valid vuids. ****************************************************************************/ uint16 register_vuid(uid_t uid,gid_t gid, char *unix_name, char *requested_name, BOOL guest, uchar user_sess_key[16]) { user_struct *vuser; struct passwd *pwfile; /* for getting real name from passwd file */ /* Ensure no vuid gets registered in share level security. */ if(lp_security() == SEC_SHARE) return UID_FIELD_INVALID; #if 0 /* * After observing MS-Exchange services writing to a Samba share * I belive this code is incorrect. Each service does its own * sessionsetup_and_X for the same user, and as each service shuts * down, it does a user_logoff_and_X. As we are consolidating multiple * sessionsetup_and_X's onto the same vuid here, when the first service * shuts down, it invalidates all the open files for the other services. * Hence I am removing this code and forcing each sessionsetup_and_X * to get a new vuid. * Jeremy Allison. (jallison@whistle.com). */ int i; for(i = 0; i < num_validated_users; i++) { vuser = &validated_users[i]; if ( vuser->uid == uid ) return (uint16)(i + VUID_OFFSET); /* User already validated */ } #endif validated_users = (user_struct *)Realloc(validated_users, sizeof(user_struct)* (num_validated_users+1)); if (!validated_users) { DEBUG(0,("Failed to realloc users struct!\n")); num_validated_users = 0; return UID_FIELD_INVALID; } vuser = &validated_users[num_validated_users]; num_validated_users++; vuser->uid = uid; vuser->gid = gid; vuser->guest = guest; fstrcpy(vuser->name,unix_name); fstrcpy(vuser->requested_name,requested_name); memcpy(vuser->dc.user_sess_key, user_sess_key, sizeof(vuser->dc.user_sess_key)); vuser->n_sids = 0; vuser->sids = NULL; vuser->n_groups = 0; vuser->groups = NULL; /* Find all the groups this uid is in and store them. Used by become_user() */ get_unixgroups(unix_name,uid,gid, &vuser->n_groups, &vuser->groups); DEBUG(3,("uid %d registered to name %s\n",(int)uid,unix_name)); DEBUG(3, ("Clearing default real name\n")); fstrcpy(vuser->real_name, "\0"); if (lp_unix_realname()) { if ((pwfile=hashed_getpwnam(vuser->name))!= NULL) { DEBUG(3, ("User name: %s\tReal name: %s\n",vuser->name,pwfile->pw_gecos)); fstrcpy(vuser->real_name, pwfile->pw_gecos); } } return (uint16)((num_validated_users - 1) + VUID_OFFSET); } /**************************************************************************** add a name to the session users list ****************************************************************************/ void add_session_user(char *user) { fstring suser; StrnCpy(suser,user,sizeof(suser)-1); if (!Get_Pwnam(suser,True)) return; if (suser && *suser && !in_list(suser,session_users,False)) { if (strlen(suser) + strlen(session_users) + 2 >= sizeof(pstring)) DEBUG(1,("Too many session users??\n")); else { pstrcat(session_users," "); pstrcat(session_users,suser); } } } /**************************************************************************** update the encrypted smbpasswd file from the plaintext username and password *****************************************************************************/ static BOOL update_smbpassword_file(char *user, char *password) { struct smb_passwd *smbpw; BOOL ret; become_root(0); smbpw = getsmbpwnam(user); unbecome_root(0); if(smbpw == NULL) { DEBUG(0,("getsmbpwnam returned NULL\n")); return False; } /* Here, the flag is one, because we want to ignore the XXXXXXX'd out password */ ret = change_oem_password( smbpw, password, True); if (!ret) { DEBUG(3,("change_oem_password returned False\n")); } return ret; } /**************************************************************************** core of smb password checking routine. ****************************************************************************/ static BOOL smb_pwd_check_ntlmv1(char *password, unsigned char *part_passwd, unsigned char *c8, uchar sess_key[16]) { /* Finish the encryption of part_passwd. */ unsigned char p24[24]; if (part_passwd == NULL) DEBUG(10,("No password set - allowing access\n")); /* No password set - always true ! */ if (part_passwd == NULL) return True; SMBOWFencrypt(part_passwd, c8, p24); if (sess_key != NULL) { SMBsesskeygen_ntv1(part_passwd, NULL, sess_key); } #if DEBUG_PASSWORD DEBUG(100,("Part password (P16) was |")); dump_data(100, part_passwd, 16); DEBUG(100,("Password from client was |")); dump_data(100, password, 24); DEBUG(100,("Given challenge was |")); dump_data(100, c8, 8); DEBUG(100,("Value from encryption was |")); dump_data(100, p24, 24); #endif return (memcmp(p24, password, 24) == 0); } /**************************************************************************** core of smb password checking routine. ****************************************************************************/ static BOOL smb_pwd_check_ntlmv2(char *password, size_t pwd_len, unsigned char *part_passwd, unsigned char const *c8, const char *user, const char *domain, char *sess_key) { /* Finish the encryption of part_passwd. */ unsigned char kr[16]; unsigned char resp[16]; if (part_passwd == NULL) { DEBUG(10,("No password set - allowing access\n")); } /* No password set - always true ! */ if (part_passwd == NULL) { return True; } ntv2_owf_gen(part_passwd, user, domain, kr); SMBOWFencrypt_ntv2(kr, c8, 8, password+16, pwd_len-16, resp); if (sess_key != NULL) { SMBsesskeygen_ntv2(kr, resp, sess_key); } #if DEBUG_PASSWORD DEBUG(100,("Part password (P16) was |")); dump_data(100, part_passwd, 16); DEBUG(100,("Password from client was |")); dump_data(100, password, pwd_len); DEBUG(100,("Given challenge was |")); dump_data(100, c8, 8); DEBUG(100,("Value from encryption was |")); dump_data(100, resp, 16); #endif return (memcmp(resp, password, 16) == 0); } /**************************************************************************** Do a specific test for an smb password being correct, given a smb_password and the lanman and NT responses. ****************************************************************************/ BOOL smb_password_ok(struct smb_passwd *smb_pass, uchar chal[8], const char *user, const char *domain, uchar *lm_pass, size_t lm_pwd_len, uchar *nt_pass, size_t nt_pwd_len, uchar sess_key[16]) { uchar challenge[8]; if (smb_pass == NULL) { return False; } DEBUG(4,("Checking SMB password for user %s\n", smb_pass->unix_name)); if (smb_pass->acct_ctrl & ACB_DISABLED) { DEBUG(3,("account for user %s was disabled.\n", smb_pass->unix_name)); return False; } if (chal == NULL) { DEBUG(5,("use last SMBnegprot challenge\n")); if (!last_challenge(challenge)) { DEBUG(1,("no challenge done - password failed\n")); return False; } } else { DEBUG(5,("challenge received\n")); memcpy(challenge, chal, 8); } if ((Protocol >= PROTOCOL_NT1) && (smb_pass->smb_nt_passwd != NULL)) { /* We have the NT MD4 hash challenge available - see if we can use it (ie. does it exist in the smbpasswd file). */ if (lp_server_ntlmv2() != False && nt_pwd_len > 24) { DEBUG(4,("smb_password_ok: Check NTLMv2 password\n")); if (smb_pwd_check_ntlmv2(nt_pass, nt_pwd_len, (uchar *)smb_pass->smb_nt_passwd, challenge, user, domain, sess_key)) { return True; } } if (lp_server_ntlmv2() != True && nt_pwd_len == 24) { DEBUG(4,("smb_password_ok: Check NT MD4 password\n")); if (smb_pwd_check_ntlmv1((char *)nt_pass, (uchar *)smb_pass->smb_nt_passwd, challenge, sess_key)) { DEBUG(4,("NT MD4 password check succeeded\n")); return True; } } DEBUG(4,("NT MD4 password check failed\n")); } if (lp_server_ntlmv2() == True) { DEBUG(4,("Not checking LM MD4 password\n")); return False; } /* Try against the lanman password. smb_pass->smb_passwd == NULL means no password, allow access. */ DEBUG(4,("Checking LM MD4 password\n")); if ((smb_pass->smb_passwd == NULL) && (smb_pass->acct_ctrl & ACB_PWNOTREQ)) { DEBUG(4,("no password required for user %s\n", smb_pass->unix_name)); return True; } if ((smb_pass->smb_passwd != NULL) && smb_pwd_check_ntlmv1((char *)lm_pass, (uchar *)smb_pass->smb_passwd, challenge, NULL)) { DEBUG(4,("LM MD4 password check succeeded\n")); return(True); } DEBUG(4,("LM MD4 password check failed\n")); return False; } /**************************************************************************** check if a username/password is OK assuming the password is a 24 byte SMB hash return True if the password is correct, False otherwise ****************************************************************************/ BOOL pass_check_smb(struct smb_passwd *smb_pass, char *domain, uchar *chal, uchar *lm_pwd, size_t lm_pwd_len, uchar *nt_pwd, size_t nt_pwd_len, struct passwd *pwd, uchar user_sess_key[16]) { const struct passwd *pass; struct passwd pw; char *user = NULL; if (smb_pass == NULL) { DEBUG(3,("Couldn't find user %s in smb_passwd file.\n", user)); return False; } user = smb_pass->unix_name; if (lm_pwd == NULL || nt_pwd == NULL) { return False; } if (pwd != NULL && user == NULL) { pass = (struct passwd *) pwd; user = pass->pw_name; } else { pass = Get_Pwnam(user,True); if (pass == NULL) { DEBUG(3,("Couldn't find user %s\n",user)); return False; } memcpy(&pw, pass, sizeof(struct passwd)); pass = &pw; } /* Quit if the account was disabled. */ if (smb_pass->acct_ctrl & ACB_DISABLED) { DEBUG(3,("account for user %s was disabled.\n", user)); return False; } /* Ensure the uid's match */ if (smb_pass->unix_uid != pass->pw_uid) { DEBUG(3,("Error : UNIX (%d) and SMB (%d) uids in password files do not match !\n", pass->pw_uid, smb_pass->unix_uid)); return False; } if (lm_pwd[0] == '\0' && IS_BITS_SET_ALL(smb_pass->acct_ctrl, ACB_PWNOTREQ) && lp_null_passwords()) { DEBUG(3,("account for user %s has no password and null passwords are allowed.\n", smb_pass->unix_name)); return(True); } if (smb_password_ok(smb_pass, chal, user, domain, lm_pwd, lm_pwd_len, nt_pwd, nt_pwd_len, user_sess_key)) { if (user_sess_key != NULL) { #ifdef DEBUG_PASSWORD DEBUG(100,("user session key: ")); dump_data(100, user_sess_key, 16); #endif } return(True); } DEBUG(3,("Error pass_check_smb failed\n")); return False; } /**************************************************************************** check if a username/password pair is OK either via the system password database or the encrypted SMB password database return True if the password is correct, False otherwise ****************************************************************************/ BOOL password_ok(char *user, char *password, int pwlen, struct passwd *pwd, uchar user_sess_key[16]) { if (pwlen >= 24 || (lp_encrypted_passwords() && (pwlen == 0) && lp_null_passwords())) { /* if 24 bytes or longer assume it is an encrypted password */ uchar challenge[8]; if (!last_challenge(challenge)) { DEBUG(0,("Error: challenge not done for user=%s\n", user)); return False; } return pass_check_smb(getsmbpwnam(user), global_myworkgroup, challenge, (uchar *)password, pwlen, (uchar *)password, pwlen, pwd, user_sess_key); } return pass_check(user, password, pwlen, pwd, lp_update_encrypted() ? update_smbpassword_file : NULL); } /**************************************************************************** check if a username is valid ****************************************************************************/ BOOL user_ok(char *user,int snum) { pstring valid, invalid; BOOL ret; StrnCpy(valid, lp_valid_users(snum), sizeof(pstring)); StrnCpy(invalid, lp_invalid_users(snum), sizeof(pstring)); string_sub(valid,"%S",lp_servicename(snum)); string_sub(invalid,"%S",lp_servicename(snum)); ret = !user_in_list(user,invalid); if (ret && valid && *valid) { ret = user_in_list(user,valid); } if (ret && lp_onlyuser(snum)) { char *user_list = lp_username(snum); string_sub(user_list,"%S",lp_servicename(snum)); ret = user_in_list(user,user_list); } return(ret); } /**************************************************************************** validate a group username entry. Return the username or NULL ****************************************************************************/ static char *validate_group(char *group,char *password,int pwlen,int snum, uchar user_sess_key[16]) { #if defined(HAVE_NETGROUP) && defined(HAVE_GETNETGRENT) && defined(HAVE_SETNETGRENT) && defined(HAVE_ENDNETGRENT) { char *host, *user, *domain; setnetgrent(group); while (getnetgrent(&host, &user, &domain)) { if (user) { if (user_ok(user, snum) && password_ok(user,password,pwlen,NULL, user_sess_key)) { endnetgrent(); return(user); } } } endnetgrent(); } #endif #ifdef HAVE_GETGRNAM { struct group *gptr = (struct group *)getgrnam(group); char **member; if (gptr) { member = gptr->gr_mem; while (member && *member) { static fstring name; fstrcpy(name,*member); if (user_ok(name,snum) && password_ok(name,password,pwlen,NULL, user_sess_key)) return(&name[0]); member++; } #ifdef GROUP_CHECK_PWENT { struct passwd *pwd; static fstring tm; setpwent (); while (pwd = getpwent ()) { if (*(pwd->pw_passwd) && pwd->pw_gid == gptr->gr_gid) { /* This Entry have PASSWORD and same GID then check pwd */ if (password_ok(NULL, password, pwlen, pwd, user_sess_key)) { fstrcpy(tm, pwd->pw_name); endpwent (); return tm; } } } endpwent (); } #endif /* GROUP_CHECK_PWENT */ } } #endif return(NULL); } /**************************************************************************** check for authority to login to a service with a given username/password ****************************************************************************/ BOOL authorise_login(int snum,char *user,char *password, int pwlen, BOOL *guest,BOOL *force,uint16 vuid) { BOOL ok = False; *guest = False; #if DEBUG_PASSWORD DEBUG(100,("checking authorisation on user=%s pass=%s\n",user,password)); #endif /* there are several possibilities: 1) login as the given user with given password 2) login as a previously registered username with the given password 3) login as a session list username with the given password 4) login as a previously validated user/password pair 5) login as the "user =" user with given password 6) login as the "user =" user with no password (guest connection) 7) login as guest user with no password if the service is guest_only then steps 1 to 5 are skipped */ if (GUEST_ONLY(snum)) *force = True; if (!(GUEST_ONLY(snum) && GUEST_OK(snum))) { user_struct *vuser = get_valid_user_struct(vuid); /* check the given username and password */ if (!ok && (*user) && user_ok(user,snum)) { ok = password_ok(user,password, pwlen, NULL, vuser->dc.user_sess_key); if (ok) DEBUG(3,("ACCEPTED: given username password ok\n")); } /* check for a previously registered guest username */ if (!ok && (vuser != 0) && vuser->guest) { if (user_ok(vuser->name,snum) && password_ok(vuser->name, password, pwlen, NULL, vuser->dc.user_sess_key)) { fstrcpy(user, vuser->name); vuser->guest = False; DEBUG(3,("ACCEPTED: given password with registered user %s\n", user)); ok = True; } } /* now check the list of session users */ if (!ok) { char *auser; char *user_list = strdup(session_users); if (!user_list) return False; for (auser=strtok(user_list,LIST_SEP); !ok && auser; auser = strtok(NULL,LIST_SEP)) { fstring user2; fstrcpy(user2,auser); if (!user_ok(user2,snum)) continue; if (password_ok(user2,password, pwlen, NULL, vuser->dc.user_sess_key)) { ok = True; fstrcpy(user,user2); DEBUG(3,("ACCEPTED: session list username and given password ok\n")); } } free(user_list); } /* check for a previously validated username/password pair */ if (!ok && (!lp_revalidate(snum) || lp_security() > SEC_SHARE) && (vuser != 0) && !vuser->guest && user_ok(vuser->name,snum)) { fstrcpy(user,vuser->name); *guest = False; DEBUG(3,("ACCEPTED: validated uid ok as non-guest\n")); ok = True; } /* check for a rhosts entry */ if (!ok && user_ok(user,snum) && check_hosts_equiv(user)) { ok = True; DEBUG(3,("ACCEPTED: hosts equiv or rhosts entry\n")); } /* check the user= fields and the given password */ if (!ok && lp_username(snum)) { char *auser; pstring user_list; StrnCpy(user_list,lp_username(snum),sizeof(pstring)); string_sub(user_list,"%S",lp_servicename(snum)); for (auser=strtok(user_list,LIST_SEP); auser && !ok; auser = strtok(NULL,LIST_SEP)) { if (*auser == '@') { auser = validate_group(auser+1,password,pwlen,snum, vuser->dc.user_sess_key); if (auser) { ok = True; fstrcpy(user,auser); DEBUG(3,("ACCEPTED: group username and given password ok\n")); } } else { fstring user2; fstrcpy(user2,auser); if (user_ok(user2,snum) && password_ok(user2,password,pwlen,NULL, vuser->dc.user_sess_key)) { ok = True; fstrcpy(user,user2); DEBUG(3,("ACCEPTED: user list username and given password ok\n")); } } } } } /* not guest only */ /* check for a normal guest connection */ if (!ok && GUEST_OK(snum)) { fstring guestname; StrnCpy(guestname,lp_guestaccount(snum),sizeof(guestname)-1); if (Get_Pwnam(guestname,True)) { fstrcpy(user,guestname); ok = True; DEBUG(3,("ACCEPTED: guest account and guest ok\n")); } else DEBUG(0,("Invalid guest account %s??\n",guestname)); *guest = True; *force = True; } if (ok && !user_ok(user,snum)) { DEBUG(0,("rejected invalid user %s\n",user)); ok = False; } return(ok); } /**************************************************************************** read the a hosts.equiv or .rhosts file and check if it allows this user from this machine ****************************************************************************/ static BOOL check_user_equiv(char *user, char *remote, char *equiv_file) { pstring buf; int plus_allowed = 1; char *file_host; char *file_user; FILE *fp = sys_fopen(equiv_file, "r"); DEBUG(5, ("check_user_equiv %s %s %s\n", user, remote, equiv_file)); if (! fp) return False; while(fgets(buf, sizeof(buf), fp)) { trim_string(buf," "," "); if (buf[0] != '#' && buf[0] != '\n') { BOOL is_group = False; int plus = 1; char *bp = buf; if (strcmp(buf, "NO_PLUS\n") == 0) { DEBUG(6, ("check_user_equiv NO_PLUS\n")); plus_allowed = 0; } else { if (buf[0] == '+') { bp++; if (*bp == '\n' && plus_allowed) { /* a bare plus means everbody allowed */ DEBUG(6, ("check_user_equiv everybody allowed\n")); fclose(fp); return True; } } else if (buf[0] == '-') { bp++; plus = 0; } if (*bp == '@') { is_group = True; bp++; } file_host = strtok(bp, " \t\n"); file_user = strtok(NULL, " \t\n"); DEBUG(7, ("check_user_equiv %s %s\n", file_host ? file_host : "(null)", file_user ? file_user : "(null)" )); if (file_host && *file_host) { BOOL host_ok = False; #if defined(HAVE_NETGROUP) && defined(HAVE_YP_GET_DEFAULT_DOMAIN) if (is_group) { static char *mydomain = NULL; if (!mydomain) yp_get_default_domain(&mydomain); if (mydomain && innetgr(file_host,remote,user,mydomain)) host_ok = True; } #else if (is_group) { DEBUG(1,("Netgroups not configured\n")); continue; } #endif /* is it this host */ /* the fact that remote has come from a call of gethostbyaddr * means that it may have the fully qualified domain name * so we could look up the file version to get it into * a canonical form, but I would rather just type it * in full in the equiv file */ if (!host_ok && !is_group && strequal(remote, file_host)) host_ok = True; if (!host_ok) continue; /* is it this user */ if (file_user == 0 || strequal(user, file_user)) { fclose(fp); DEBUG(5, ("check_user_equiv matched %s%s %s\n", (plus ? "+" : "-"), file_host, (file_user ? file_user : ""))); return (plus ? True : False); } } } } } fclose(fp); return False; } /**************************************************************************** check for a possible hosts equiv or rhosts entry for the user ****************************************************************************/ BOOL check_hosts_equiv(char *user) { char *fname = NULL; pstring rhostsfile; const struct passwd *pass = Get_Pwnam(user,True); if (!pass) return False; fname = lp_hosts_equiv(); /* note: don't allow hosts.equiv on root */ if (fname && *fname && (pass->pw_uid != 0)) { extern int Client; if (check_user_equiv(user,client_name(Client),fname)) return(True); } if (lp_use_rhosts()) { char *home = get_home_dir(user); if (home) { extern int Client; slprintf(rhostsfile, sizeof(rhostsfile)-1, "%s/.rhosts", home); if (check_user_equiv(user,client_name(Client),rhostsfile)) return(True); } } return False; } /**************************************************************************** return the client state structure ****************************************************************************/ struct cli_state *server_client(void) { static struct cli_state pw_cli; return &pw_cli; } /**************************************************************************** support for server level security ****************************************************************************/ struct cli_state *server_cryptkey(void) { if (cli_connect_serverlist(server_client(), lp_passwordserver())) { return server_client(); } return NULL; } /**************************************************************************** validate a password with the password server ****************************************************************************/ BOOL server_validate(char *user, char *domain, char *pass, int passlen, char *ntpass, int ntpasslen) { struct cli_state *cli; static unsigned char badpass[24]; static BOOL tested_password_server = False; static BOOL bad_password_server = False; cli = server_client(); if (!cli->initialised) { DEBUG(1,("password server %s is not connected\n", cli->desthost)); return False; } if(badpass[0] == 0) memset(badpass, 0x1f, sizeof(badpass)); if((passlen == sizeof(badpass)) && !memcmp(badpass, pass, passlen)) { /* * Very unlikely, our random bad password is the same as the users * password. */ memset(badpass, badpass[0]+1, sizeof(badpass)); } /* * Attempt a session setup with a totally incorrect password. * If this succeeds with the guest bit *NOT* set then the password * server is broken and is not correctly setting the guest bit. We * need to detect this as some versions of NT4.x are broken. JRA. */ if(!tested_password_server) { if (cli_session_setup(cli, user, (char *)badpass, sizeof(badpass), (char *)badpass, sizeof(badpass), domain)) { /* * We connected to the password server so we * can say we've tested it. */ tested_password_server = True; if ((SVAL(cli->inbuf,smb_vwv2) & 1) == 0) { DEBUG(0,("server_validate: password server %s allows users as non-guest \ with a bad password.\n", cli->desthost)); DEBUG(0,("server_validate: This is broken (and insecure) behaviour. Please do not \ use this machine as the password server.\n")); cli_ulogoff(cli); /* * Password server has the bug. */ bad_password_server = True; return False; } cli_ulogoff(cli); } } else { /* * We have already tested the password server. * Fail immediately if it has the bug. */ if(bad_password_server) { DEBUG(0,("server_validate: [1] password server %s allows users as non-guest \ with a bad password.\n", cli->desthost)); DEBUG(0,("server_validate: [1] This is broken (and insecure) behaviour. Please do not \ use this machine as the password server.\n")); return False; } } /* * Now we know the password server will correctly set the guest bit, or is * not guest enabled, we can try with the real password. */ if (!cli_session_setup(cli, user, pass, passlen, ntpass, ntpasslen, domain)) { DEBUG(1,("password server %s rejected the password\n", cli->desthost)); return False; } /* if logged in as guest then reject */ if ((SVAL(cli->inbuf,smb_vwv2) & 1) != 0) { DEBUG(1,("password server %s gave us guest only\n", cli->desthost)); cli_ulogoff(cli); return False; } cli_ulogoff(cli); return(True); } /*********************************************************************** Do the same as security=server, but using NT Domain calls and a session key from the workstation trust account password. ************************************************************************/ BOOL domain_client_validate( char *user, char *domain, char *server_list, char *acct_name, uint16 acct_type, char *smb_apasswd, int smb_apasslen, char *smb_ntpasswd, int smb_ntpasslen, uchar user_sess_key[16]) { unsigned char local_challenge[8]; unsigned char local_lm_response[24]; unsigned char local_nt_reponse[24]; unsigned char trust_passwd[16]; NET_ID_INFO_CTR ctr; NET_USER_INFO_3 info3; uint32 smb_uid_low; fstring trust_acct; fstring srv_name; fstrcpy(trust_acct, acct_name); fstrcat(trust_acct, "$"); /* * Check that the requested domain is not our own machine name. * If it is, we should never check the PDC here, we use our own local * password file. */ if(strequal( domain, global_myname)) { DEBUG(3,("domain_client_validate: Requested domain was for this machine.\n")); return False; } /* * Next, check that the passwords given were encrypted. */ if(((smb_apasslen != 24) && (smb_apasslen != 0)) || ((smb_ntpasslen <= 24) && (smb_ntpasslen != 0))) { /* * Not encrypted - do so. */ DEBUG(3,("domain_client_validate: User passwords not in encrypted format.\n")); generate_random_buffer( local_challenge, 8, False); SMBencrypt( (uchar *)smb_apasswd, local_challenge, local_lm_response); SMBNTencrypt((uchar *)smb_ntpasswd, local_challenge, local_nt_reponse); smb_apasslen = 24; smb_ntpasslen = 24; smb_apasswd = (char *)local_lm_response; smb_ntpasswd = (char *)local_nt_reponse; } else { /* * Encrypted - get the challenge we sent for these * responses. */ if (!last_challenge(local_challenge)) { DEBUG(0,("domain_client_validate: no challenge done - password failed\n")); return False; } } /* * Get the workstation trust account password. */ if (!trust_get_passwd( trust_passwd, domain, acct_name)) { return False; } /* * At this point, smb_apasswd points to the lanman response to * the challenge in local_challenge, and smb_ntpasswd points to * the NT response to the challenge in local_challenge. Ship * these over the secure channel to a domain controller and * see if they were valid. */ /* * Ok - we have an anonymous connection to the IPC$ share. * Now start the NT Domain stuff :-). */ if(cli_nt_setup_creds(server_list, global_myname, trust_acct, trust_passwd, acct_type, srv_name) != 0x0) { DEBUG(0,("domain_client_validate: unable to setup the PDC credentials to machine \ %s.\n", srv_name)); return False; } /* We really don't care what LUID we give the user. */ generate_random_buffer( (unsigned char *)&smb_uid_low, 4, False); if (!cli_nt_login_network(srv_name, global_myname, domain, user, smb_uid_low, (char *)local_challenge, ((smb_apasslen != 0) ? smb_apasswd : NULL), ((smb_ntpasslen != 0) ? smb_ntpasswd : NULL), &ctr, &info3)) { DEBUG(0,("domain_client_validate: unable to validate password for user %s in domain \ %s to Domain controller %s.\n", user, domain, srv_name)); return False; } /* * Here, if we really want it, we have lots of info about the user in info3. * LKCLXXXX - really important to check things like "is this user acct * locked out / disabled" etc!!!! */ return True; }