2 Unix SMB/CIFS implementation.
3 Check access based on valid users, read list and friends
4 Copyright (C) Volker Lendecke 2005
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
21 #include "smbd/globals.h"
24 * No prefix means direct username
25 * @name means netgroup first, then unix group
26 * &name means netgroup
27 * +name means unix group
28 * + and & may be combined
31 static bool do_group_checks(const char **name
, const char **pattern
)
33 if ((*name
)[0] == '@') {
39 if (((*name
)[0] == '+') && ((*name
)[1] == '&')) {
45 if ((*name
)[0] == '+') {
51 if (((*name
)[0] == '&') && ((*name
)[1] == '+')) {
57 if ((*name
)[0] == '&') {
66 static bool token_contains_name(TALLOC_CTX
*mem_ctx
,
69 const char *sharename
,
70 const struct nt_user_token
*token
,
75 enum lsa_SidType type
;
77 if (username
!= NULL
) {
78 name
= talloc_sub_basic(mem_ctx
, username
, domain
, name
);
80 if (sharename
!= NULL
) {
81 name
= talloc_string_sub(mem_ctx
, name
, "%S", sharename
);
85 /* This is too security sensitive, better panic than return a
86 * result that might be interpreted in a wrong way. */
87 smb_panic("substitutions failed");
90 /* check to see is we already have a SID */
92 if ( string_to_sid( &sid
, name
) ) {
93 DEBUG(5,("token_contains_name: Checking for SID [%s] in token\n", name
));
94 return nt_token_check_sid( &sid
, token
);
97 if (!do_group_checks(&name
, &prefix
)) {
98 if (!lookup_name_smbconf(mem_ctx
, name
, LOOKUP_NAME_ALL
,
99 NULL
, NULL
, &sid
, &type
)) {
100 DEBUG(5, ("lookup_name %s failed\n", name
));
103 if (type
!= SID_NAME_USER
) {
104 DEBUG(5, ("%s is a %s, expected a user\n",
105 name
, sid_type_lookup(type
)));
108 return nt_token_check_sid(&sid
, token
);
111 for (/* initialized above */ ; *prefix
!= '\0'; prefix
++) {
112 if (*prefix
== '+') {
113 if (!lookup_name_smbconf(mem_ctx
, name
,
114 LOOKUP_NAME_ALL
|LOOKUP_NAME_GROUP
,
115 NULL
, NULL
, &sid
, &type
)) {
116 DEBUG(5, ("lookup_name %s failed\n", name
));
119 if ((type
!= SID_NAME_DOM_GRP
) &&
120 (type
!= SID_NAME_ALIAS
) &&
121 (type
!= SID_NAME_WKN_GRP
)) {
122 DEBUG(5, ("%s is a %s, expected a group\n",
123 name
, sid_type_lookup(type
)));
126 if (nt_token_check_sid(&sid
, token
)) {
131 if (*prefix
== '&') {
133 if (user_in_netgroup(username
, name
)) {
139 smb_panic("got invalid prefix from do_groups_check");
145 * Check whether a user is contained in the list provided.
147 * Please note that the user name and share names passed in here mainly for
148 * the substitution routines that expand the parameter values, the decision
149 * whether a user is in the list is done after a lookup_name on the expanded
150 * parameter value, solely based on comparing the SIDs in token.
152 * The other use is the netgroup check when using @group or &group.
155 bool token_contains_name_in_list(const char *username
,
157 const char *sharename
,
158 const struct nt_user_token
*token
,
167 if ( (mem_ctx
= talloc_new(NULL
)) == NULL
) {
168 smb_panic("talloc_new failed");
171 while (*list
!= NULL
) {
172 if (token_contains_name(mem_ctx
, username
, domain
, sharename
,
174 TALLOC_FREE(mem_ctx
);
180 TALLOC_FREE(mem_ctx
);
185 * Check whether the user described by "token" has access to share snum.
187 * This looks at "invalid users", "valid users" and "only user/username"
189 * Please note that the user name and share names passed in here mainly for
190 * the substitution routines that expand the parameter values, the decision
191 * whether a user is in the list is done after a lookup_name on the expanded
192 * parameter value, solely based on comparing the SIDs in token.
194 * The other use is the netgroup check when using @group or &group.
197 bool user_ok_token(const char *username
, const char *domain
,
198 const struct nt_user_token
*token
, int snum
)
200 if (lp_invalid_users(snum
) != NULL
) {
201 if (token_contains_name_in_list(username
, domain
,
202 lp_servicename(snum
),
204 lp_invalid_users(snum
))) {
205 DEBUG(10, ("User %s in 'invalid users'\n", username
));
210 if (lp_valid_users(snum
) != NULL
) {
211 if (!token_contains_name_in_list(username
, domain
,
212 lp_servicename(snum
), token
,
213 lp_valid_users(snum
))) {
214 DEBUG(10, ("User %s not in 'valid users'\n",
220 if (lp_onlyuser(snum
)) {
222 list
[0] = lp_username(snum
);
224 if ((list
[0] == NULL
) || (*list
[0] == '\0')) {
225 DEBUG(0, ("'only user = yes' and no 'username ='\n"));
228 if (!token_contains_name_in_list(NULL
, domain
,
229 lp_servicename(snum
),
231 DEBUG(10, ("%s != 'username'\n", username
));
236 DEBUG(10, ("user_ok_token: share %s is ok for unix user %s\n",
237 lp_servicename(snum
), username
));
243 * Check whether the user described by "token" is restricted to read-only
244 * access on share snum.
246 * This looks at "invalid users", "valid users" and "only user/username"
248 * Please note that the user name and share names passed in here mainly for
249 * the substitution routines that expand the parameter values, the decision
250 * whether a user is in the list is done after a lookup_name on the expanded
251 * parameter value, solely based on comparing the SIDs in token.
253 * The other use is the netgroup check when using @group or &group.
256 bool is_share_read_only_for_token(const char *username
,
258 const struct nt_user_token
*token
,
259 connection_struct
*conn
)
261 int snum
= SNUM(conn
);
262 bool result
= conn
->read_only
;
264 if (lp_readlist(snum
) != NULL
) {
265 if (token_contains_name_in_list(username
, domain
,
266 lp_servicename(snum
), token
,
267 lp_readlist(snum
))) {
272 if (lp_writelist(snum
) != NULL
) {
273 if (token_contains_name_in_list(username
, domain
,
274 lp_servicename(snum
), token
,
275 lp_writelist(snum
))) {
280 DEBUG(10,("is_share_read_only_for_user: share %s is %s for unix user "
281 "%s\n", lp_servicename(snum
),
282 result
? "read-only" : "read-write", username
));