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|
/*
Unix SMB/CIFS implementation.
Password and authentication handling
Copyright (C) Andrew Tridgell 1992-1998
Copyright (C) Jeremy Allison 2007.
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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
/* users from session setup */
static char *session_userlist = NULL;
/* workgroup from session setup. */
static char *session_workgroup = NULL;
/* 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;
enum server_allocated_state { SERVER_ALLOCATED_REQUIRED_YES,
SERVER_ALLOCATED_REQUIRED_NO,
SERVER_ALLOCATED_REQUIRED_ANY};
static user_struct *get_valid_user_struct_internal(uint16 vuid,
enum server_allocated_state server_allocated)
{
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) {
switch (server_allocated) {
case SERVER_ALLOCATED_REQUIRED_YES:
if (usp->server_info == NULL) {
continue;
}
break;
case SERVER_ALLOCATED_REQUIRED_NO:
if (usp->server_info != NULL) {
continue;
}
case SERVER_ALLOCATED_REQUIRED_ANY:
break;
}
if (count > 10) {
DLIST_PROMOTE(validated_users, usp);
}
return usp;
}
}
return NULL;
}
/****************************************************************************
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)
{
return get_valid_user_struct_internal(vuid,
SERVER_ALLOCATED_REQUIRED_YES);
}
bool is_partial_auth_vuid(uint16 vuid)
{
if (vuid == UID_FIELD_INVALID) {
return False;
}
return get_valid_user_struct_internal(vuid,
SERVER_ALLOCATED_REQUIRED_NO) ? True : False;
}
/****************************************************************************
Get the user struct of a partial NTLMSSP login
****************************************************************************/
user_struct *get_partial_auth_user_struct(uint16 vuid)
{
return get_valid_user_struct_internal(vuid,
SERVER_ALLOCATED_REQUIRED_NO);
}
/****************************************************************************
Invalidate a uid.
****************************************************************************/
void invalidate_vuid(uint16 vuid)
{
user_struct *vuser = NULL;
if (vuid == UID_FIELD_INVALID) {
return;
}
vuser = get_valid_user_struct_internal(vuid,
SERVER_ALLOCATED_REQUIRED_ANY);
if (vuser == NULL) {
return;
}
session_yield(vuser);
data_blob_free(&vuser->session_key);
if (vuser->auth_ntlmssp_state) {
auth_ntlmssp_end(&vuser->auth_ntlmssp_state);
}
DLIST_REMOVE(validated_users, vuser);
/* clear the vuid from the 'cache' on each connection, and
from the vuid 'owner' of connections */
conn_clear_vuid_cache(vuid);
TALLOC_FREE(vuser);
num_validated_vuids--;
}
/****************************************************************************
Invalidate all vuid entries for this process.
****************************************************************************/
void invalidate_all_vuids(void)
{
user_struct *usp, *next=NULL;
for (usp=validated_users;usp;usp=next) {
next = usp->next;
invalidate_vuid(usp->vuid);
}
}
/****************************************************
Create a new partial auth user struct.
*****************************************************/
int register_initial_vuid(void)
{
user_struct *vuser;
/* Paranoia check. */
if(lp_security() == SEC_SHARE) {
smb_panic("register_initial_vuid: "
"Tried to register uid in security=share");
}
/* Limit allowed vuids to 16bits - VUID_OFFSET. */
if (num_validated_vuids >= 0xFFFF-VUID_OFFSET) {
return UID_FIELD_INVALID;
}
if((vuser = talloc_zero(NULL, user_struct)) == NULL) {
DEBUG(0,("register_initial_vuid: "
"Failed to talloc users struct!\n"));
return UID_FIELD_INVALID;
}
/* Allocate a free vuid. Yes this is a linear search... */
while( get_valid_user_struct_internal(next_vuid,
SERVER_ALLOCATED_REQUIRED_ANY) != NULL ) {
next_vuid++;
/* Check for vuid wrap. */
if (next_vuid == UID_FIELD_INVALID) {
next_vuid = VUID_OFFSET;
}
}
DEBUG(10,("register_initial_vuid: allocated vuid = %u\n",
(unsigned int)next_vuid ));
vuser->vuid = next_vuid;
/*
* This happens in an unfinished NTLMSSP session setup. We
* need to allocate a vuid between the first and second calls
* to NTLMSSP.
*/
next_vuid++;
num_validated_vuids++;
DLIST_ADD(validated_users, vuser);
return vuser->vuid;
}
static int register_homes_share(const char *username)
{
int result;
struct passwd *pwd;
result = lp_servicenumber(username);
if (result != -1) {
DEBUG(3, ("Using static (or previously created) service for "
"user '%s'; path = '%s'\n", username,
lp_pathname(result)));
return result;
}
pwd = getpwnam_alloc(talloc_tos(), username);
if ((pwd == NULL) || (pwd->pw_dir[0] == '\0')) {
DEBUG(3, ("No home directory defined for user '%s'\n",
username));
TALLOC_FREE(pwd);
return -1;
}
DEBUG(3, ("Adding homes service for user '%s' using home directory: "
"'%s'\n", username, pwd->pw_dir));
result = add_home_service(username, username, pwd->pw_dir);
TALLOC_FREE(pwd);
return result;
}
/**
* register that a valid login has been performed, establish 'session'.
* @param server_info The token returned from the authentication process.
* (now 'owned' by register_existing_vuid)
*
* @param session_key The User session key for the login session (now also
* 'owned' by register_existing_vuid)
*
* @param respose_blob The NT challenge-response, if available. (May be
* freed after this call)
*
* @param smb_name The untranslated name of the user
*
* @return Newly allocated vuid, biased by an offset. (This allows us to
* tell random client vuid's (normally zero) from valid vuids.)
*
*/
int register_existing_vuid(uint16 vuid,
auth_serversupplied_info *server_info,
DATA_BLOB session_key,
DATA_BLOB response_blob,
const char *smb_name)
{
user_struct *vuser = get_partial_auth_user_struct(vuid);
if (!vuser) {
goto fail;
}
/* Use this to keep tabs on all our info from the authentication */
vuser->server_info = server_info;
/* Ensure that the server_info will disappear with
* the vuser it is now attached to */
talloc_steal(vuser, vuser->server_info);
/* the next functions should be done by a SID mapping system (SMS) as
* the new real sam db won't have reference to unix uids or gids
*/
vuser->uid = server_info->uid;
vuser->gid = server_info->gid;
vuser->n_groups = server_info->n_groups;
if (vuser->n_groups) {
if (!(vuser->groups = (gid_t *)talloc_memdup(vuser,
server_info->groups,
sizeof(gid_t)*vuser->n_groups))) {
DEBUG(0,("register_existing_vuid: "
"failed to talloc_memdup vuser->groups\n"));
goto fail;
}
}
vuser->guest = server_info->guest;
fstrcpy(vuser->user.unix_name, server_info->unix_name);
/* This is a potentially untrusted username */
alpha_strcpy(vuser->user.smb_name, smb_name, ". _-$",
sizeof(vuser->user.smb_name));
fstrcpy(vuser->user.domain, pdb_get_domain(server_info->sam_account));
fstrcpy(vuser->user.full_name,
pdb_get_fullname(server_info->sam_account));
{
const char *logon_script =
pdb_get_logon_script(server_info->sam_account);
if (logon_script) {
vuser->logon_script = logon_script;
}
}
vuser->session_key = session_key;
DEBUG(10,("register_existing_vuid: (%u,%u) %s %s %s guest=%d\n",
(unsigned int)vuser->uid,
(unsigned int)vuser->gid,
vuser->user.unix_name, vuser->user.smb_name,
vuser->user.domain, vuser->guest ));
DEBUG(3, ("register_existing_vuid: User name: %s\t"
"Real name: %s\n", vuser->user.unix_name,
vuser->user.full_name));
if (server_info->ptok) {
vuser->nt_user_token = dup_nt_token(vuser, server_info->ptok);
} else {
DEBUG(1, ("register_existing_vuid: server_info does not "
"contain a user_token - cannot continue\n"));
goto fail;
}
DEBUG(3,("register_existing_vuid: UNIX uid %d is UNIX user %s, "
"and will be vuid %u\n",
(int)vuser->uid,vuser->user.unix_name, vuser->vuid));
next_vuid++;
num_validated_vuids++;
if (!session_claim(vuser)) {
DEBUG(1, ("register_existing_vuid: Failed to claim session "
"for vuid=%d\n",
vuser->vuid));
goto fail;
}
/* Register a home dir service for this user if
(a) This is not a guest connection,
(b) we have a home directory defined
(c) there s not an existing static share by that name
If a share exists by this name (autoloaded or not) reuse it . */
vuser->homes_snum = -1;
if (!vuser->guest) {
vuser->homes_snum = register_homes_share(
vuser->user.unix_name);
}
if (srv_is_signing_negotiated() && !vuser->guest &&
!srv_signing_started()) {
/* Try and turn on server signing on the first non-guest
* sessionsetup. */
srv_set_signing(vuser->session_key, response_blob);
}
/* fill in the current_user_info struct */
set_current_user_info( &vuser->user );
return vuser->vuid;
fail:
if (vuser) {
invalidate_vuid(vuid);
}
return UID_FIELD_INVALID;
}
/****************************************************************************
Add a name to the session users list.
****************************************************************************/
void add_session_user(const char *user)
{
struct passwd *pw;
char *tmp;
pw = Get_Pwnam_alloc(talloc_tos(), user);
if (pw == NULL) {
return;
}
if (session_userlist == NULL) {
session_userlist = SMB_STRDUP(pw->pw_name);
goto done;
}
if (in_list(pw->pw_name,session_userlist,False) ) {
goto done;
}
if (strlen(session_userlist) > 128 * 1024) {
DEBUG(3,("add_session_user: session userlist already "
"too large.\n"));
goto done;
}
if (asprintf(&tmp, "%s %s", session_userlist, pw->pw_name) == -1) {
DEBUG(3, ("asprintf failed\n"));
goto done;
}
SAFE_FREE(session_userlist);
session_userlist = tmp;
done:
TALLOC_FREE(pw);
}
/****************************************************************************
In security=share mode we need to store the client workgroup, as that's
what Vista uses for the NTLMv2 calculation.
****************************************************************************/
void add_session_workgroup(const char *workgroup)
{
if (session_workgroup) {
SAFE_FREE(session_workgroup);
}
session_workgroup = smb_xstrdup(workgroup);
}
/****************************************************************************
In security=share mode we need to return the client workgroup, as that's
what Vista uses for the NTLMv2 calculation.
****************************************************************************/
const char *get_session_workgroup(void)
{
return session_workgroup;
}
/****************************************************************************
Check if a user is in a netgroup user list. If at first we don't succeed,
try lower case.
****************************************************************************/
bool user_in_netgroup(const char *user, const char *ngname)
{
#ifdef HAVE_NETGROUP
static char *mydomain = NULL;
fstring lowercase_user;
if (mydomain == NULL)
yp_get_default_domain(&mydomain);
if(mydomain == NULL) {
DEBUG(5,("Unable to get default yp domain, "
"let's try without specifying it\n"));
}
DEBUG(5,("looking for user %s of domain %s in netgroup %s\n",
user, mydomain?mydomain:"(ANY)", ngname));
if (innetgr(ngname, NULL, user, mydomain)) {
DEBUG(5,("user_in_netgroup: Found\n"));
return (True);
} else {
/*
* Ok, innetgr is case sensitive. Try once more with lowercase
* just in case. Attempt to fix #703. JRA.
*/
fstrcpy(lowercase_user, user);
strlower_m(lowercase_user);
DEBUG(5,("looking for user %s of domain %s in netgroup %s\n",
lowercase_user, mydomain?mydomain:"(ANY)", ngname));
if (innetgr(ngname, NULL, lowercase_user, mydomain)) {
DEBUG(5,("user_in_netgroup: Found\n"));
return (True);
}
}
#endif /* HAVE_NETGROUP */
return False;
}
/****************************************************************************
Check if a user is in a user list - can check combinations of UNIX
and netgroup lists.
****************************************************************************/
bool user_in_list(const char *user,const char **list)
{
if (!list || !*list)
return False;
DEBUG(10,("user_in_list: checking user %s in list\n", user));
while (*list) {
DEBUG(10,("user_in_list: checking user |%s| against |%s|\n",
user, *list));
/*
* Check raw username.
*/
if (strequal(user, *list))
return(True);
/*
* Now check to see if any combination
* of UNIX and netgroups has been specified.
*/
if(**list == '@') {
/*
* Old behaviour. Check netgroup list
* followed by UNIX list.
*/
if(user_in_netgroup(user, *list +1))
return True;
if(user_in_group(user, *list +1))
return True;
} else if (**list == '+') {
if((*(*list +1)) == '&') {
/*
* Search UNIX list followed by netgroup.
*/
if(user_in_group(user, *list +2))
return True;
if(user_in_netgroup(user, *list +2))
return True;
} else {
/*
* Just search UNIX list.
*/
if(user_in_group(user, *list +1))
return True;
}
} else if (**list == '&') {
if(*(*list +1) == '+') {
/*
* Search netgroup list followed by UNIX list.
*/
if(user_in_netgroup(user, *list +2))
return True;
if(user_in_group(user, *list +2))
return True;
} else {
/*
* Just search netgroup list.
*/
if(user_in_netgroup(user, *list +1))
return True;
}
}
list++;
}
return(False);
}
/****************************************************************************
Check if a username is valid.
****************************************************************************/
static bool user_ok(const char *user, int snum)
{
char **valid, **invalid;
bool ret;
valid = invalid = NULL;
ret = True;
if (lp_invalid_users(snum)) {
str_list_copy(talloc_tos(), &invalid, lp_invalid_users(snum));
if (invalid &&
str_list_substitute(invalid, "%S", lp_servicename(snum))) {
/* This is used in sec=share only, so no current user
* around to pass to str_list_sub_basic() */
if ( invalid && str_list_sub_basic(invalid, "", "") ) {
ret = !user_in_list(user,
(const char **)invalid);
}
}
}
TALLOC_FREE(invalid);
if (ret && lp_valid_users(snum)) {
str_list_copy(talloc_tos(), &valid, lp_valid_users(snum));
if ( valid &&
str_list_substitute(valid, "%S", lp_servicename(snum)) ) {
/* This is used in sec=share only, so no current user
* around to pass to str_list_sub_basic() */
if ( valid && str_list_sub_basic(valid, "", "") ) {
ret = user_in_list(user, (const char **)valid);
}
}
}
TALLOC_FREE(valid);
if (ret && lp_onlyuser(snum)) {
char **user_list = str_list_make(
talloc_tos(), lp_username(snum), NULL);
if (user_list &&
str_list_substitute(user_list, "%S",
lp_servicename(snum))) {
ret = user_in_list(user, (const char **)user_list);
}
TALLOC_FREE(user_list);
}
return(ret);
}
/****************************************************************************
Validate a group username entry. Return the username or NULL.
****************************************************************************/
static char *validate_group(char *group, DATA_BLOB password,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)) {
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 onto the heap before
* use. Bug pointed out by leon@eatworms.swmed.edu.
*/
if (gptr) {
char *member_list = NULL;
size_t list_len = 0;
char *member;
int i;
for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
list_len += strlen(gptr->gr_mem[i])+1;
}
list_len++;
member_list = (char *)SMB_MALLOC(list_len);
if (!member_list) {
endgrent();
return NULL;
}
*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;
DEBUG(10,("validate_group: = gr_mem = "
"%s\n", gptr->gr_mem[i]));
safe_strcpy(member, gptr->gr_mem[i],
list_len - (member-member_list));
member += member_len;
}
endgrent();
member = member_list;
while (*member) {
if (user_ok(member,snum) &&
password_ok(member,password)) {
char *name = talloc_strdup(talloc_tos(),
member);
SAFE_FREE(member_list);
return name;
}
DEBUG(10,("validate_group = member = %s\n",
member));
member += strlen(member) + 1;
}
SAFE_FREE(member_list);
} else {
endgrent();
return NULL;
}
}
#endif
return(NULL);
}
/****************************************************************************
Check for authority to login to a service with a given username/password.
Note this is *NOT* used when logging on using sessionsetup_and_X.
****************************************************************************/
bool authorise_login(int snum, fstring user, DATA_BLOB password,
bool *guest)
{
bool ok = False;
#ifdef DEBUG_PASSWORD
DEBUG(100,("authorise_login: checking authorisation on "
"user=%s pass=%s\n", user,password.data));
#endif
*guest = False;
/* 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
*/
/* now check the list of session users */
if (!ok) {
char *auser;
char *user_list = NULL;
char *saveptr;
if ( session_userlist )
user_list = SMB_STRDUP(session_userlist);
else
user_list = SMB_STRDUP("");
if (!user_list)
return(False);
for (auser = strtok_r(user_list, LIST_SEP, &saveptr);
!ok && auser;
auser = strtok_r(NULL, LIST_SEP, &saveptr)) {
fstring user2;
fstrcpy(user2,auser);
if (!user_ok(user2,snum))
continue;
if (password_ok(user2,password)) {
ok = True;
fstrcpy(user,user2);
DEBUG(3,("authorise_login: ACCEPTED: session "
"list username (%s) and given "
"password ok\n", user));
}
}
SAFE_FREE(user_list);
}
/* check the user= fields and the given password */
if (!ok && lp_username(snum)) {
TALLOC_CTX *ctx = talloc_tos();
char *auser;
char *user_list = talloc_strdup(ctx, lp_username(snum));
char *saveptr;
if (!user_list) {
goto check_guest;
}
user_list = talloc_string_sub(ctx,
user_list,
"%S",
lp_servicename(snum));
if (!user_list) {
goto check_guest;
}
for (auser = strtok_r(user_list, LIST_SEP, &saveptr);
auser && !ok;
auser = strtok_r(NULL, LIST_SEP, &saveptr)) {
if (*auser == '@') {
auser = validate_group(auser+1,password,snum);
if (auser) {
ok = True;
fstrcpy(user,auser);
DEBUG(3,("authorise_login: ACCEPTED: "
"group username and given "
"password ok (%s)\n", user));
}
} else {
fstring user2;
fstrcpy(user2,auser);
if (user_ok(user2,snum) &&
password_ok(user2,password)) {
ok = True;
fstrcpy(user,user2);
DEBUG(3,("authorise_login: ACCEPTED: "
"user list username and "
"given password ok (%s)\n",
user));
}
}
}
}
check_guest:
/* check for a normal guest connection */
if (!ok && GUEST_OK(snum)) {
struct passwd *guest_pw;
fstring guestname;
fstrcpy(guestname,lp_guestaccount());
guest_pw = Get_Pwnam_alloc(talloc_tos(), guestname);
if (guest_pw != NULL) {
fstrcpy(user,guestname);
ok = True;
DEBUG(3,("authorise_login: ACCEPTED: guest account "
"and guest ok (%s)\n", user));
} else {
DEBUG(0,("authorise_login: Invalid guest account "
"%s??\n",guestname));
}
TALLOC_FREE(guest_pw);
*guest = True;
}
if (ok && !user_ok(user, snum)) {
DEBUG(0,("authorise_login: rejected invalid user %s\n",user));
ok = False;
}
return(ok);
}
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