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|
/*
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);
}
/****************************************************************************
Setup the groups a user belongs to.
****************************************************************************/
int get_unixgroups(char *user, uid_t uid, gid_t gid, int *p_ngroups, gid_t **p_groups)
{
int i,ngroups;
gid_t grp = 0;
gid_t *groups = NULL;
if (-1 == initgroups(user,gid))
{
if (getuid() == 0)
{
DEBUG(0,("Unable to initgroups!\n"));
if (gid < 0 || gid > 16000 || uid < 0 || uid > 16000)
{
DEBUG(0,("This is probably a problem with the account %s\n", user));
}
}
return -1;
}
ngroups = sys_getgroups(0,&grp);
if (ngroups <= 0)
{
ngroups = 32;
}
if((groups = (gid_t *)malloc(sizeof(gid_t)*ngroups)) == NULL)
{
DEBUG(0,("get_unixgroups malloc fail !\n"));
return -1;
}
ngroups = sys_getgroups(ngroups,groups);
(*p_ngroups) = ngroups;
(*p_groups) = groups;
DEBUG( 3, ( "%s is in %d groups: ", user, ngroups ) );
for (i = 0; i < ngroups; i++ )
{
DEBUG( 3, ( "%s%d", (i ? ", " : ""), (int)groups[i] ) );
}
DEBUG( 3, ( "\n" ) );
return 0;
}
/****************************************************************************
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)
{
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);
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, "<Full Name>\0");
if (lp_unix_realname()) {
if ((pwfile=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 == 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 ! */
if (part_passwd == NULL)
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(struct smb_passwd *smb_pass, uchar chal[8],
uchar lm_pass[24], uchar nt_pass[24])
{
uchar challenge[8];
if (!lm_pass || !smb_pass) 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).
*/
DEBUG(4,("smb_password_ok: Checking NT MD4 password\n"));
if (smb_password_check((char *)nt_pass,
(uchar *)smb_pass->smb_nt_passwd,
challenge)) {
DEBUG(4,("NT MD4 password check succeeded\n"));
return(True);
}
DEBUG(4,("NT MD4 password check failed\n"));
}
/* 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_password_check((char *)lm_pass,
(uchar *)smb_pass->smb_passwd, 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;
struct smb_passwd *smb_pass;
if (!lm_pwd || !nt_pwd)
{
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);
}
smb_pass = getsmbpwnam(user);
if (smb_pass == NULL)
{
DEBUG(3,("Couldn't find user %s in smb_passwd file.\n", user));
return(False);
}
/* 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 and SMB uids in password files do not match !\n"));
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, lm_pwd, nt_pwd))
{
return(True);
}
DEBUG(3,("Error smb_password_check 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)
{
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));
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)
{
#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)) {
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))
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)) {
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);
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)) {
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)) {
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);
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;
*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;
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)
{
struct cli_state *cli;
fstring desthost;
struct in_addr dest_ip;
extern fstring local_machine;
char *p;
BOOL connected_ok = False;
struct nmb_name calling, called;
cli = server_client();
if (!cli_initialise(cli))
return NULL;
p = lp_passwordserver();
while(p && 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;
}
}
if (!connected_ok) {
DEBUG(0,("password server not available\n"));
cli_shutdown(cli);
return NULL;
}
make_nmb_name(&calling, local_machine, 0x0 , scope);
make_nmb_name(&called , desthost , 0x20, scope);
if (!cli_session_request(cli, &calling, &called)) {
/* try with *SMBSERVER if the first name fails */
cli_shutdown(cli);
make_nmb_name(&called , "*SMBSERVER", 0x20, scope);
if (!cli_initialise(cli) ||
!cli_connect(cli, desthost, &dest_ip) ||
!cli_session_request(cli, &calling, &called)) {
DEBUG(1,("%s rejected the session\n",desthost));
cli_shutdown(cli);
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);
}
/***********************************************************************
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)
{
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;
struct cli_state cli;
uint32 smb_uid_low;
/*
* 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 machine account password.
*/
if (!trust_get_passwd( trust_passwd, global_myworkgroup, global_myname))
{
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.
*/
if (!cli_connect_serverlist(&cli, lp_passwordserver()))
{
DEBUG(0,("domain_client_validate: Domain password server not available.\n"));
return False;
}
/*
* Ok - we have an anonymous connection to the IPC$ share.
* Now start the NT Domain stuff :-).
*/
if(cli_nt_session_open(&cli, PIPE_NETLOGON) == False) {
DEBUG(0,("domain_client_validate: unable to open the domain client session to \
machine %s. Error was : %s.\n", cli.desthost, cli_errstr(&cli)));
cli_nt_session_close(&cli);
cli_ulogoff(&cli);
cli_shutdown(&cli);
return False;
}
if(cli_nt_setup_creds(&cli, trust_passwd) == False) {
DEBUG(0,("domain_client_validate: unable to setup the PDC credentials to machine \
%s. Error was : %s.\n", cli.desthost, cli_errstr(&cli)));
cli_nt_session_close(&cli);
cli_ulogoff(&cli);
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);
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) {
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, cli.desthost, cli_errstr(&cli)));
cli_nt_session_close(&cli);
cli_ulogoff(&cli);
cli_shutdown(&cli);
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, cli.desthost, cli_errstr(&cli)));
cli_nt_session_close(&cli);
cli_ulogoff(&cli);
cli_shutdown(&cli);
return False;
}
#endif /* 0 */
cli_nt_session_close(&cli);
cli_ulogoff(&cli);
cli_shutdown(&cli);
return True;
}
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