/* 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; extern struct in_addr ipzero; /* users from session setup */ static pstring session_users=""; 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++) + sys_getpid() + tval.tv_sec; v2 = (counter++) * sys_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; static int next_vuid = VUID_OFFSET; static int num_validated_vuids; /**************************************************************************** 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) { user_struct *usp; int count=0; if (vuid == UID_FIELD_INVALID) return NULL; for (usp=validated_users;usp;usp=usp->next,count++) { if (vuid == usp->vuid) { if (count > 10) DLIST_PROMOTE(validated_users, usp); return usp; } } return NULL; } /**************************************************************************** invalidate a uid ****************************************************************************/ void invalidate_vuid(uint16 vuid) { user_struct *vuser = get_valid_user_struct(vuid); if (vuser == NULL) return; DLIST_REMOVE(validated_users, vuser); safe_free(vuser->groups); delete_nt_token(&vuser->nt_user_token); safe_free(vuser); num_validated_vuids--; } /**************************************************************************** return a validated username ****************************************************************************/ char *validated_username(uint16 vuid) { user_struct *vuser = get_valid_user_struct(vuid); if (vuser == NULL) return 0; return(vuser->user.unix_name); } /**************************************************************************** return a validated domain ****************************************************************************/ char *validated_domain(uint16 vuid) { user_struct *vuser = get_valid_user_struct(vuid); if (vuser == NULL) return 0; return(vuser->user.domain); } /**************************************************************************** Create the SID list for this user. ****************************************************************************/ NT_USER_TOKEN *create_nt_token(uid_t uid, gid_t gid, int ngroups, gid_t *groups, BOOL is_guest) { extern DOM_SID global_sid_World; extern DOM_SID global_sid_Network; extern DOM_SID global_sid_Builtin_Guests; extern DOM_SID global_sid_Authenticated_Users; NT_USER_TOKEN *token; DOM_SID *psids; int i, psid_ndx = 0; size_t num_sids = 0; fstring sid_str; if ((token = (NT_USER_TOKEN *)malloc( sizeof(NT_USER_TOKEN) ) ) == NULL) return NULL; ZERO_STRUCTP(token); /* We always have uid/gid plus World and Network and Authenticated Users or Guest SIDs. */ num_sids = 5 + ngroups; if ((token->user_sids = (DOM_SID *)malloc( num_sids*sizeof(DOM_SID))) == NULL) { free(token); return NULL; } psids = token->user_sids; /* * Note - user SID *MUST* be first in token ! * se_access_check depends on this. */ uid_to_sid( &psids[psid_ndx++], uid); /* * Primary group SID is second in token. Convention. */ gid_to_sid( &psids[psid_ndx++], gid); /* Now add the group SIDs. */ for (i = 0; i < ngroups; i++) { if (groups[i] != gid) { gid_to_sid( &psids[psid_ndx++], groups[i]); } } /* * Finally add the "standard" SIDs. * The only difference between guest and "anonymous" (which we * don't really support) is the addition of Authenticated_Users. */ sid_copy( &psids[psid_ndx++], &global_sid_World); sid_copy( &psids[psid_ndx++], &global_sid_Network); if (is_guest) sid_copy( &psids[psid_ndx++], &global_sid_Builtin_Guests); else sid_copy( &psids[psid_ndx++], &global_sid_Authenticated_Users); token->num_sids = psid_ndx; /* Dump list of sids in token */ for (i = 0; i < token->num_sids; i++) { DEBUG(5, ("user token sid %s\n", sid_to_string(sid_str, &token->user_sids[i]))); } return token; } /**************************************************************************** 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, char *domain,BOOL guest) { user_struct *vuser = NULL; 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; /* Limit allowed vuids to 16bits - VUID_OFFSET. */ if (num_validated_vuids >= 0xFFFF-VUID_OFFSET) return UID_FIELD_INVALID; if((vuser = (user_struct *)malloc( sizeof(user_struct) )) == NULL) { DEBUG(0,("Failed to malloc users struct!\n")); return UID_FIELD_INVALID; } ZERO_STRUCTP(vuser); DEBUG(10,("register_vuid: (%u,%u) %s %s %s guest=%d\n", (unsigned int)uid, (unsigned int)gid, unix_name, requested_name, domain, guest )); /* Allocate a free vuid. Yes this is a linear search... :-) */ while( get_valid_user_struct(next_vuid) != NULL ) { next_vuid++; /* Check for vuid wrap. */ if (next_vuid == UID_FIELD_INVALID) next_vuid = VUID_OFFSET; } DEBUG(10,("register_vuid: allocated vuid = %u\n", (unsigned int)next_vuid )); vuser->vuid = next_vuid; vuser->uid = uid; vuser->gid = gid; vuser->guest = guest; fstrcpy(vuser->user.unix_name,unix_name); fstrcpy(vuser->user.smb_name,requested_name); fstrcpy(vuser->user.domain,domain); vuser->n_groups = 0; vuser->groups = NULL; /* Find all the groups this uid is in and store them. Used by become_user() */ initialise_groups(unix_name, uid, gid); get_current_groups( &vuser->n_groups, &vuser->groups); /* Create an NT_USER_TOKEN struct for this user. */ vuser->nt_user_token = create_nt_token(uid,gid, vuser->n_groups, vuser->groups, guest); next_vuid++; num_validated_vuids++; DLIST_ADD(validated_users, vuser); DEBUG(3,("uid %d registered to name %s\n",(int)uid,unix_name)); DEBUG(3, ("Clearing default real name\n")); fstrcpy(vuser->user.full_name, ""); if (lp_unix_realname()) { if ((pwfile=sys_getpwnam(vuser->user.unix_name))!= NULL) { DEBUG(3, ("User name: %s\tReal name: %s\n",vuser->user.unix_name,pwfile->pw_gecos)); fstrcpy(vuser->user.full_name, pwfile->pw_gecos); } } return vuser->vuid; } /**************************************************************************** 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) { SAM_ACCOUNT *sampass = NULL; BOOL ret; become_root(); sampass = pdb_getsampwnam(user); unbecome_root(); if(sampass == NULL) { DEBUG(0,("pdb_getsampwnam returned NULL\n")); return False; } /* * Remove the account disabled flag - we are updating the * users password from a login. */ pdb_set_acct_ctrl(sampass, pdb_get_acct_ctrl(sampass) & ~ACB_DISABLED); /* Here, the flag is one, because we want to ignore the XXXXXXX'd out password */ ret = change_oem_password( sampass, password, True); if (ret == False) { DEBUG(3,("change_oem_password returned False\n")); } return ret; } /**************************************************************************** core of smb password checking routine. ****************************************************************************/ BOOL smb_password_check(char *password, unsigned char *part_passwd, unsigned char *c8) { /* Finish the encryption of part_passwd. */ unsigned char p21[21]; unsigned char p24[24]; if (part_passwd == NULL) { DEBUG(10,("No password set - allowing access\n")); /* No password set - always true ! */ return 1; } memset(p21,'\0',21); memcpy(p21,part_passwd,16); E_P24(p21, c8, p24); #if DEBUG_PASSWORD { int i; DEBUG(100,("Part password (P16) was |")); for(i = 0; i < 16; i++) DEBUG(100,("%X ", (unsigned char)part_passwd[i])); DEBUG(100,("|\n")); DEBUG(100,("Password from client was |")); for(i = 0; i < 24; i++) DEBUG(100,("%X ", (unsigned char)password[i])); DEBUG(100,("|\n")); DEBUG(100,("Given challenge was |")); for(i = 0; i < 8; i++) DEBUG(100,("%X ", (unsigned char)c8[i])); DEBUG(100,("|\n")); DEBUG(100,("Value from encryption was |")); for(i = 0; i < 24; i++) DEBUG(100,("%X ", (unsigned char)p24[i])); DEBUG(100,("|\n")); } #endif return (memcmp(p24, password, 24) == 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(SAM_ACCOUNT *sampass, uchar chal[8], uchar lm_pass[24], uchar nt_pass[24]) { uchar challenge[8]; char* user_name; uint8 *nt_pw, *lm_pw; if (!lm_pass || !sampass) return(False); user_name = pdb_get_username(sampass); DEBUG(4,("Checking SMB password for user %s\n",user_name)); if(pdb_get_acct_ctrl(sampass) & ACB_DISABLED) { DEBUG(1,("account for user %s was disabled.\n", user_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); } nt_pw = pdb_get_nt_passwd(sampass); if ((Protocol >= PROTOCOL_NT1) && (nt_pw != NULL)) { /* We have the NT MD4 hash challenge available - see if we can use it (ie. does it exist in the smbpasswd file). */ DEBUG(4,("smb_password_ok: Checking NT MD4 password\n")); if (smb_password_check((char *)nt_pass, (uchar *)nt_pw, challenge)) { DEBUG(4,("NT MD4 password check succeeded\n")); return(True); } DEBUG(4,("NT MD4 password check failed\n")); } /* Try against the lanman password. pdb_get_lanman_passwd(sampass) == NULL means no password, allow access. */ DEBUG(4,("Checking LM MD4 password\n")); lm_pw = pdb_get_lanman_passwd(sampass); if((lm_pw == NULL) && (pdb_get_acct_ctrl(sampass) & ACB_PWNOTREQ)) { DEBUG(4,("no password required for user %s\n",user_name)); return True; } if((lm_pw != NULL) && smb_password_check((char *)lm_pass,(uchar *)lm_pw, challenge)) { 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(char *user, char *domain, uchar *chal, uchar *lm_pwd, uchar *nt_pwd, struct passwd *pwd) { struct passwd *pass; SAM_ACCOUNT *sampass; if (!lm_pwd || !nt_pwd) { return(False); } /* FIXME! this code looks to be unnecessary now that the passdb validates that the username exists and has a valid uid */ if (pwd != NULL && user == NULL) { pass = (struct passwd *) pwd; user = pass->pw_name; } else { /* I don't get this call here. I think it should be moved. Need to check on it. --jerry */ pass = smb_getpwnam(user,True); } if (pass == NULL) { DEBUG(1,("Couldn't find user '%s' in UNIX password database.\n",user)); return(False); } /* get the account information */ sampass = pdb_getsampwnam(user); if (sampass == NULL) { DEBUG(1,("Couldn't find user '%s' in passdb file.\n", user)); return(False); } /* Quit if the account was disabled. */ if(pdb_get_acct_ctrl(sampass) & ACB_DISABLED) { DEBUG(1,("Account for user '%s' was disabled.\n", user)); return(False); } /* Ensure the uid's match FIXME! This also seems unnecessary --jerry */ #if 0 /* GWC */ if (smb_pass->smb_userid != pass->pw_uid) { DEBUG(0,("Error : UNIX and SMB uids in password files do not match for user '%s'!\n", user)); return(False); } #endif if (pdb_get_acct_ctrl(sampass) & ACB_PWNOTREQ) { if (lp_null_passwords()) { DEBUG(3,("Account for user '%s' has no password and null passwords are allowed.\n", user)); return(True); } else { DEBUG(3,("Account for user '%s' has no password and null passwords are NOT allowed.\n", user)); return(False); } } if (smb_password_ok(sampass, chal, lm_pwd, nt_pwd)) { return(True); } DEBUG(2,("pass_check_smb failed - invalid password for user [%s]\n", user)); 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) { if (pwlen == 24 || (lp_encrypted_passwords() && (pwlen == 0) && lp_null_passwords())) { /* if 24 bytes long 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(user, global_myworkgroup, challenge, (uchar *)password, (uchar *)password, pwd); } 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)-1); StrnCpy(invalid, lp_invalid_users(snum), sizeof(pstring)-1); pstring_sub(valid,"%S",lp_servicename(snum)); pstring_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); pstring_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) { #ifdef HAVE_NETGROUP { char *host, *user, *domain; setnetgrent(group); while (getnetgrent(&host, &user, &domain)) { if (user) { if (user_ok(user, snum) && password_ok(user,password,pwlen,NULL)) { endnetgrent(); return(user); } } } endnetgrent(); } #endif #ifdef HAVE_GETGRENT { struct group *gptr; setgrent(); while ((gptr = (struct group *)getgrent())) { if (strequal(gptr->gr_name,group)) break; } /* * As user_ok can recurse doing a getgrent(), we must * copy the member list into a pstring on the stack before * use. Bug pointed out by leon@eatworms.swmed.edu. */ if (gptr) { pstring member_list; char *member; size_t copied_len = 0; int i; *member_list = '\0'; member = member_list; for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) { size_t member_len = strlen(gptr->gr_mem[i]) + 1; if( copied_len + member_len < sizeof(pstring)) { DEBUG(10,("validate_group: = gr_mem = %s\n", gptr->gr_mem[i])); safe_strcpy(member, gptr->gr_mem[i], sizeof(pstring) - copied_len - 1); copied_len += member_len; member += copied_len; } else { *member = '\0'; } } endgrent(); member = member_list; while (*member) { static fstring name; fstrcpy(name,member); if (user_ok(name,snum) && password_ok(name,password,pwlen,NULL)) { endgrent(); return(&name[0]); } DEBUG(10,("validate_group = member = %s\n", member)); member += strlen(member) + 1; } } else { endgrent(); return NULL; } } #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); 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->user.unix_name,snum) && password_ok(vuser->user.unix_name, password, pwlen, NULL)) { fstrcpy(user, vuser->user.unix_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)) { 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_security() > SEC_SHARE) && (vuser != 0) && !vuser->guest && user_ok(vuser->user.unix_name,snum)) { fstrcpy(user,vuser->user.unix_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)); pstring_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); 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)) { 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; } 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) { int plus_allowed = 1; char *file_host; char *file_user; char **lines = file_lines_load(equiv_file, NULL, False); int i; DEBUG(5, ("check_user_equiv %s %s %s\n", user, remote, equiv_file)); if (! lines) return False; for (i=0; lines[i]; i++) { char *buf = lines[i]; 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")); file_lines_free(lines); 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)) { DEBUG(5, ("check_user_equiv matched %s%s %s\n", (plus ? "+" : "-"), file_host, (file_user ? file_user : ""))); file_lines_free(lines); return (plus ? True : False); } } } } } file_lines_free(lines); 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; 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)) { if (check_user_equiv(user,client_name(),fname)) return(True); } if (lp_use_rhosts()) { char *home = get_user_home_dir(user); if (home) { slprintf(rhostsfile, sizeof(rhostsfile)-1, "%s/.rhosts", home); if (check_user_equiv(user,client_name(),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) { struct cli_state *cli; fstring desthost; struct in_addr dest_ip; char *p, *pserver; BOOL connected_ok = False; cli = server_client(); if (!cli_initialise(cli)) return NULL; pserver = strdup(lp_passwordserver()); p = pserver; while(next_token( &p, desthost, LIST_SEP, sizeof(desthost))) { standard_sub_basic(desthost); strupper(desthost); if(!resolve_name( desthost, &dest_ip, 0x20)) { DEBUG(1,("server_cryptkey: Can't resolve address for %s\n",desthost)); continue; } if (ismyip(dest_ip)) { DEBUG(1,("Password server loop - disabling password server %s\n",desthost)); continue; } if (cli_connect(cli, desthost, &dest_ip)) { DEBUG(3,("connected to password server %s\n",desthost)); connected_ok = True; break; } } free(pserver); if (!connected_ok) { DEBUG(0,("password server not available\n")); cli_shutdown(cli); return NULL; } if (!attempt_netbios_session_request(cli, global_myname, desthost, &dest_ip)) return NULL; DEBUG(3,("got session\n")); if (!cli_negprot(cli)) { DEBUG(1,("%s rejected the negprot\n",desthost)); cli_shutdown(cli); return NULL; } if (cli->protocol < PROTOCOL_LANMAN2 || !(cli->sec_mode & 1)) { DEBUG(1,("%s isn't in user level security mode\n",desthost)); cli_shutdown(cli); return NULL; } DEBUG(3,("password server OK\n")); return cli; } /**************************************************************************** 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); } /*********************************************************************** Connect to a remote machine for domain security authentication given a name or IP address. ************************************************************************/ static BOOL connect_to_domain_password_server(struct cli_state *pcli, char *server, unsigned char *trust_passwd) { struct in_addr dest_ip; fstring remote_machine; if(cli_initialise(pcli) == False) { DEBUG(0,("connect_to_domain_password_server: unable to initialize client connection.\n")); return False; } if (is_ipaddress(server)) { struct in_addr to_ip; /* we shouldn't have 255.255.255.255 forthe IP address of a password server anyways */ if ((to_ip.s_addr=inet_addr(server)) == 0xFFFFFFFF) { DEBUG (0,("connect_to_domain_password_server: inet_addr(%s) returned 0xFFFFFFFF!\n", server)); return False; } if (!name_status_find(0x20, to_ip, remote_machine)) { DEBUG(0, ("connect_to_domain_password_server: Can't " "resolve name for IP %s\n", server)); return False; } } else { fstrcpy(remote_machine, server); } standard_sub_basic(remote_machine); strupper(remote_machine); if(!resolve_name( remote_machine, &dest_ip, 0x20)) { DEBUG(1,("connect_to_domain_password_server: Can't resolve address for %s\n", remote_machine)); cli_shutdown(pcli); return False; } if (ismyip(dest_ip)) { DEBUG(1,("connect_to_domain_password_server: Password server loop - not using password server %s\n", remote_machine)); cli_shutdown(pcli); return False; } if (!cli_connect(pcli, remote_machine, &dest_ip)) { DEBUG(0,("connect_to_domain_password_server: unable to connect to SMB server on \ machine %s. Error was : %s.\n", remote_machine, cli_errstr(pcli) )); cli_shutdown(pcli); return False; } if (!attempt_netbios_session_request(pcli, global_myname, remote_machine, &dest_ip)) { DEBUG(0,("connect_to_password_server: machine %s rejected the NetBIOS \ session request. Error was : %s.\n", remote_machine, cli_errstr(pcli) )); return False; } pcli->protocol = PROTOCOL_NT1; if (!cli_negprot(pcli)) { DEBUG(0,("connect_to_domain_password_server: machine %s rejected the negotiate protocol. \ Error was : %s.\n", remote_machine, cli_errstr(pcli) )); cli_shutdown(pcli); return False; } if (pcli->protocol != PROTOCOL_NT1) { DEBUG(0,("connect_to_domain_password_server: machine %s didn't negotiate NT protocol.\n", remote_machine)); cli_shutdown(pcli); return False; } /* * Do an anonymous session setup. */ if (!cli_session_setup(pcli, "", "", 0, "", 0, "")) { DEBUG(0,("connect_to_domain_password_server: machine %s rejected the session setup. \ Error was : %s.\n", remote_machine, cli_errstr(pcli) )); cli_shutdown(pcli); return False; } if (!(pcli->sec_mode & 1)) { DEBUG(1,("connect_to_domain_password_server: machine %s isn't in user level security mode\n", remote_machine)); cli_shutdown(pcli); return False; } if (!cli_send_tconX(pcli, "IPC$", "IPC", "", 1)) { DEBUG(0,("connect_to_domain_password_server: machine %s rejected the tconX on the IPC$ share. \ Error was : %s.\n", remote_machine, cli_errstr(pcli) )); cli_shutdown(pcli); return False; } /* * We now have an anonymous connection to IPC$ on the domain password server. */ /* * Even if the connect succeeds we need to setup the netlogon * pipe here. We do this as we may just have changed the domain * account password on the PDC and yet we may be talking to * a BDC that doesn't have this replicated yet. In this case * a successful connect to a DC needs to take the netlogon connect * into account also. This patch from "Bjart Kvarme" . */ if(cli_nt_session_open(pcli, PIPE_NETLOGON) == False) { DEBUG(0,("connect_to_domain_password_server: unable to open the domain client session to \ machine %s. Error was : %s.\n", remote_machine, cli_errstr(pcli))); cli_nt_session_close(pcli); cli_ulogoff(pcli); cli_shutdown(pcli); return False; } if (cli_nt_setup_creds(pcli, trust_passwd) == False) { DEBUG(0,("connect_to_domain_password_server: unable to setup the PDC credentials to machine \ %s. Error was : %s.\n", remote_machine, cli_errstr(pcli))); cli_nt_session_close(pcli); cli_ulogoff(pcli); cli_shutdown(pcli); return(False); } return True; } /*********************************************************************** Utility function to attempt a connection to an IP address of a DC. ************************************************************************/ static BOOL attempt_connect_to_dc(struct cli_state *pcli, struct in_addr *ip, unsigned char *trust_passwd) { fstring dc_name; /* * Ignore addresses we have already tried. */ if (ip_equal(ipzero, *ip)) return False; if (!lookup_pdc_name(global_myname, lp_workgroup(), ip, dc_name)) return False; return connect_to_domain_password_server(pcli, dc_name, trust_passwd); } /*********************************************************************** We have been asked to dynamcially determine the IP addresses of the PDC and BDC's for this DOMAIN, and query them in turn. ************************************************************************/ static BOOL find_connect_pdc(struct cli_state *pcli, unsigned char *trust_passwd, time_t last_change_time) { struct in_addr *ip_list = NULL; int count = 0; int i; BOOL connected_ok = False; time_t time_now = time(NULL); BOOL use_pdc_only = False; /* * If the time the machine password has changed * was less than an hour ago then we need to contact * the PDC only, as we cannot be sure domain replication * has yet taken place. Bug found by Gerald (way to go * Gerald !). JRA. */ if (time_now - last_change_time < 3600) use_pdc_only = True; if (!get_dc_list(use_pdc_only, lp_workgroup(), &ip_list, &count)) return False; /* * Firstly try and contact a PDC/BDC who has the same * network address as any of our interfaces. */ for(i = 0; i < count; i++) { if(!is_local_net(ip_list[i])) continue; if((connected_ok = attempt_connect_to_dc(pcli, &ip_list[i], trust_passwd))) break; ip_list[i] = ipzero; /* Tried and failed. */ } /* * Secondly try and contact a random PDC/BDC. */ if(!connected_ok) { i = (sys_random() % count); if (!(connected_ok = attempt_connect_to_dc(pcli, &ip_list[i], trust_passwd))) ip_list[i] = ipzero; /* Tried and failed. */ } /* * Finally go through the IP list in turn, ignoring any addresses * we have already tried. */ if(!connected_ok) { /* * Try and connect to any of the other IP addresses in the PDC/BDC list. * Note that from a WINS server the #1 IP address is the PDC. */ for(i = 0; i < count; i++) { if((connected_ok = attempt_connect_to_dc(pcli, &ip_list[i], trust_passwd))) break; } } if(ip_list != NULL) free((char *)ip_list); return connected_ok; } /*********************************************************************** Do the same as security=server, but using NT Domain calls and a session key from the machine password. ************************************************************************/ BOOL domain_client_validate( char *user, char *domain, char *smb_apasswd, int smb_apasslen, char *smb_ntpasswd, int smb_ntpasslen, BOOL *user_exists) { unsigned char local_challenge[8]; unsigned char local_lm_response[24]; unsigned char local_nt_response[24]; unsigned char trust_passwd[16]; fstring remote_machine; char *p, *pserver; NET_ID_INFO_CTR ctr; NET_USER_INFO_3 info3; struct cli_state cli; uint32 smb_uid_low; BOOL connected_ok = False; time_t last_change_time; if(user_exists != NULL) *user_exists = True; /* Only set false on a very specific error. */ /* * 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_response); smb_apasslen = 24; smb_ntpasslen = 24; smb_apasswd = (char *)local_lm_response; smb_ntpasswd = (char *)local_nt_response; } 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 machine account password for our primary domain */ if (!secrets_fetch_trust_account_password(lp_workgroup(), trust_passwd, &last_change_time)) { DEBUG(0, ("domain_client_validate: could not fetch trust account password for domain %s\n", lp_workgroup())); 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. */ ZERO_STRUCT(cli); /* * Treat each name in the 'password server =' line as a potential * PDC/BDC. Contact each in turn and try and authenticate. */ pserver = lp_passwordserver(); if (! *pserver) pserver = "*"; p = pserver; while (!connected_ok && next_token(&p,remote_machine,LIST_SEP,sizeof(remote_machine))) { if(strequal(remote_machine, "*")) { connected_ok = find_connect_pdc(&cli, trust_passwd, last_change_time); } else { connected_ok = connect_to_domain_password_server(&cli, remote_machine, trust_passwd); } } if (!connected_ok) { DEBUG(0,("domain_client_validate: Domain password server not available.\n")); cli_shutdown(&cli); return False; } /* We really don't care what LUID we give the user. */ generate_random_buffer( (unsigned char *)&smb_uid_low, 4, False); ZERO_STRUCT(info3); if(cli_nt_login_network(&cli, domain, user, smb_uid_low, (char *)local_challenge, ((smb_apasslen != 0) ? smb_apasswd : NULL), ((smb_ntpasslen != 0) ? smb_ntpasswd : NULL), &ctr, &info3) == False) { uint32 nt_rpc_err; cli_error(&cli, NULL, NULL, &nt_rpc_err); DEBUG(0,("domain_client_validate: unable to validate password for user %s in domain \ %s to Domain controller %s. Error was %s.\n", user, domain, remote_machine, cli_errstr(&cli))); cli_nt_session_close(&cli); cli_ulogoff(&cli); cli_shutdown(&cli); if((nt_rpc_err == NT_STATUS_NO_SUCH_USER) && (user_exists != NULL)) *user_exists = False; return False; } /* * Here, if we really want it, we have lots of info about the user in info3. */ #if 0 /* * We don't actually need to do this - plus it fails currently with * NT_STATUS_INVALID_INFO_CLASS - we need to know *exactly* what to * send here. JRA. */ if(cli_nt_logoff(&cli, &ctr) == False) { DEBUG(0,("domain_client_validate: unable to log off user %s in domain \ %s to Domain controller %s. Error was %s.\n", user, domain, remote_machine, cli_errstr(&cli))); cli_nt_session_close(&cli); cli_ulogoff(&cli); cli_shutdown(&cli); return False; } #endif /* 0 */ /* Note - once the cli stream is shutdown the mem_ctx used to allocate the other_sids and gids structures has been deleted - so these pointers are no longer valid..... */ cli_nt_session_close(&cli); cli_ulogoff(&cli); cli_shutdown(&cli); return True; }