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/*
Unix SMB/CIFS implementation.
Check access based on valid users, read list and friends
Copyright (C) Volker Lendecke 2005
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"
#include "smbd/smbd.h"
#include "smbd/globals.h"
#include "../libcli/security/security.h"
/*
* Check whether a user is contained in the list provided.
*
* Please note that the user name and share names passed in here mainly for
* the substitution routines that expand the parameter values, the decision
* whether a user is in the list is done after a lookup_name on the expanded
* parameter value, solely based on comparing the SIDs in token.
*
* The other use is the netgroup check when using @group or &group.
*/
bool token_contains_name_in_list(const char *username,
const char *domain,
const char *sharename,
const struct security_token *token,
const char **list,
bool *match)
{
*match = false;
if (list == NULL) {
return true;
}
while (*list != NULL) {
TALLOC_CTX *frame = talloc_stackframe();
bool ok;
ok = token_contains_name(frame, username, domain, sharename,
token, *list, match);
TALLOC_FREE(frame);
if (!ok) {
return false;
}
if (*match) {
return true;
}
list += 1;
}
return true;
}
/*
* Check whether the user described by "token" has access to share snum.
*
* This looks at "invalid users" and "valid users".
*
* Please note that the user name and share names passed in here mainly for
* the substitution routines that expand the parameter values, the decision
* whether a user is in the list is done after a lookup_name on the expanded
* parameter value, solely based on comparing the SIDs in token.
*
* The other use is the netgroup check when using @group or &group.
*/
bool user_ok_token(const char *username, const char *domain,
const struct security_token *token, int snum)
{
const struct loadparm_substitution *lp_sub =
loadparm_s3_global_substitution();
bool match;
bool ok;
if (lp_invalid_users(snum) != NULL) {
ok = token_contains_name_in_list(username, domain,
lp_servicename(talloc_tos(), lp_sub, snum),
token,
lp_invalid_users(snum),
&match);
if (!ok) {
return false;
}
if (match) {
DEBUG(10, ("User %s in 'invalid users'\n", username));
return False;
}
}
if (lp_valid_users(snum) != NULL) {
ok = token_contains_name_in_list(username, domain,
lp_servicename(talloc_tos(), lp_sub, snum),
token,
lp_valid_users(snum),
&match);
if (!ok) {
return false;
}
if (!match) {
DEBUG(10, ("User %s not in 'valid users'\n",
username));
return False;
}
}
DEBUG(10, ("user_ok_token: share %s is ok for unix user %s\n",
lp_servicename(talloc_tos(), lp_sub, snum), username));
return True;
}
/*
* Check whether the user described by "token" is restricted to read-only
* access on share snum.
*
* This looks at "read list", "write list" and "read only".
*
* Please note that the user name and share names passed in here mainly for
* the substitution routines that expand the parameter values, the decision
* whether a user is in the list is done after a lookup_name on the expanded
* parameter value, solely based on comparing the SIDs in token.
*
* The other use is the netgroup check when using @group or &group.
*/
bool is_share_read_only_for_token(const char *username,
const char *domain,
const struct security_token *token,
connection_struct *conn,
bool *_read_only)
{
const struct loadparm_substitution *lp_sub =
loadparm_s3_global_substitution();
int snum = SNUM(conn);
bool read_only = conn->read_only;
bool match;
bool ok;
if (lp_read_list(snum) != NULL) {
ok = token_contains_name_in_list(username, domain,
lp_servicename(talloc_tos(), lp_sub, snum),
token,
lp_read_list(snum),
&match);
if (!ok) {
return false;
}
if (match) {
read_only = true;
}
}
if (lp_write_list(snum) != NULL) {
ok = token_contains_name_in_list(username, domain,
lp_servicename(talloc_tos(), lp_sub, snum),
token,
lp_write_list(snum),
&match);
if (!ok) {
return false;
}
if (match) {
read_only = false;
}
}
DEBUG(10,("is_share_read_only_for_user: share %s is %s for unix user "
"%s\n", lp_servicename(talloc_tos(), lp_sub, snum),
read_only ? "read-only" : "read-write", username));
*_read_only = read_only;
return true;
}
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