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/>.
23 * No prefix means direct username
24 * @name means netgroup first, then unix group
25 * &name means netgroup
26 * +name means unix group
27 * + and & may be combined
30 static bool do_group_checks(const char **name, const char **pattern)
32 if ((*name)[0] == '@') {
38 if (((*name)[0] == '+') && ((*name)[1] == '&')) {
44 if ((*name)[0] == '+') {
50 if (((*name)[0] == '&') && ((*name)[1] == '+')) {
56 if ((*name)[0] == '&') {
65 static bool token_contains_name(TALLOC_CTX *mem_ctx,
68 const char *sharename,
69 const struct nt_user_token *token,
74 enum lsa_SidType type;
76 if (username != NULL) {
77 name = talloc_sub_basic(mem_ctx, username, domain, name);
79 if (sharename != NULL) {
80 name = talloc_string_sub(mem_ctx, name, "%S", sharename);
84 /* This is too security sensitive, better panic than return a
85 * result that might be interpreted in a wrong way. */
86 smb_panic("substitutions failed");
89 /* check to see is we already have a SID */
91 if ( string_to_sid( &sid, name ) ) {
92 DEBUG(5,("token_contains_name: Checking for SID [%s] in token\n", name));
93 return nt_token_check_sid( &sid, token );
96 if (!do_group_checks(&name, &prefix)) {
97 if (!lookup_name_smbconf(mem_ctx, name, LOOKUP_NAME_ALL,
98 NULL, NULL, &sid, &type)) {
99 DEBUG(5, ("lookup_name %s failed\n", name));
102 if (type != SID_NAME_USER) {
103 DEBUG(5, ("%s is a %s, expected a user\n",
104 name, sid_type_lookup(type)));
107 return nt_token_check_sid(&sid, token);
110 for (/* initialized above */ ; *prefix != '\0'; prefix++) {
111 if (*prefix == '+') {
112 if (!lookup_name_smbconf(mem_ctx, name,
113 LOOKUP_NAME_ALL|LOOKUP_NAME_GROUP,
114 NULL, NULL, &sid, &type)) {
115 DEBUG(5, ("lookup_name %s failed\n", name));
118 if ((type != SID_NAME_DOM_GRP) &&
119 (type != SID_NAME_ALIAS) &&
120 (type != SID_NAME_WKN_GRP)) {
121 DEBUG(5, ("%s is a %s, expected a group\n",
122 name, sid_type_lookup(type)));
125 if (nt_token_check_sid(&sid, token)) {
130 if (*prefix == '&') {
131 if (user_in_netgroup(username, name)) {
136 smb_panic("got invalid prefix from do_groups_check");
142 * Check whether a user is contained in the list provided.
144 * Please note that the user name and share names passed in here mainly for
145 * the substitution routines that expand the parameter values, the decision
146 * whether a user is in the list is done after a lookup_name on the expanded
147 * parameter value, solely based on comparing the SIDs in token.
149 * The other use is the netgroup check when using @group or &group.
152 bool token_contains_name_in_list(const char *username,
154 const char *sharename,
155 const struct nt_user_token *token,
164 if ( (mem_ctx = talloc_new(NULL)) == NULL ) {
165 smb_panic("talloc_new failed");
168 while (*list != NULL) {
169 if (token_contains_name(mem_ctx, username, domain, sharename,
171 TALLOC_FREE(mem_ctx);
177 TALLOC_FREE(mem_ctx);
182 * Check whether the user described by "token" has access to share snum.
184 * This looks at "invalid users", "valid users" and "only user/username"
186 * Please note that the user name and share names passed in here mainly for
187 * the substitution routines that expand the parameter values, the decision
188 * whether a user is in the list is done after a lookup_name on the expanded
189 * parameter value, solely based on comparing the SIDs in token.
191 * The other use is the netgroup check when using @group or &group.
194 bool user_ok_token(const char *username, const char *domain,
195 const struct nt_user_token *token, int snum)
197 if (lp_invalid_users(snum) != NULL) {
198 if (token_contains_name_in_list(username, domain,
199 lp_servicename(snum),
201 lp_invalid_users(snum))) {
202 DEBUG(10, ("User %s in 'invalid users'\n", username));
207 if (lp_valid_users(snum) != NULL) {
208 if (!token_contains_name_in_list(username, domain,
209 lp_servicename(snum), token,
210 lp_valid_users(snum))) {
211 DEBUG(10, ("User %s not in 'valid users'\n",
217 if (lp_onlyuser(snum)) {
219 list[0] = lp_username(snum);
221 if ((list[0] == NULL) || (*list[0] == '\0')) {
222 DEBUG(0, ("'only user = yes' and no 'username ='\n"));
225 if (!token_contains_name_in_list(NULL, domain,
226 lp_servicename(snum),
228 DEBUG(10, ("%s != 'username'\n", username));
233 DEBUG(10, ("user_ok_token: share %s is ok for unix user %s\n",
234 lp_servicename(snum), username));
240 * Check whether the user described by "token" is restricted to read-only
241 * access on share snum.
243 * This looks at "invalid users", "valid users" and "only user/username"
245 * Please note that the user name and share names passed in here mainly for
246 * the substitution routines that expand the parameter values, the decision
247 * whether a user is in the list is done after a lookup_name on the expanded
248 * parameter value, solely based on comparing the SIDs in token.
250 * The other use is the netgroup check when using @group or &group.
253 bool is_share_read_only_for_token(const char *username,
255 const struct nt_user_token *token,
256 connection_struct *conn)
258 int snum = SNUM(conn);
259 bool result = conn->read_only;
261 if (lp_readlist(snum) != NULL) {
262 if (token_contains_name_in_list(username, domain,
263 lp_servicename(snum), token,
264 lp_readlist(snum))) {
269 if (lp_writelist(snum) != NULL) {
270 if (token_contains_name_in_list(username, domain,
271 lp_servicename(snum), token,
272 lp_writelist(snum))) {
277 DEBUG(10,("is_share_read_only_for_user: share %s is %s for unix user "
278 "%s\n", lp_servicename(snum),
279 result ? "read-only" : "read-write", username));