s3:smbd: s/struct timed_event/struct tevent_timer
[Samba/gebeck_regimport.git] / source3 / smbd / share_access.c
blobd3c18fc80bee0e0da334fa438af46fd605a2a28e
1 /*
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/>.
20 #include "includes.h"
21 #include "smbd/smbd.h"
22 #include "smbd/globals.h"
23 #include "../libcli/security/security.h"
24 #include "passdb/lookup_sid.h"
25 #include "auth.h"
28 * No prefix means direct username
29 * @name means netgroup first, then unix group
30 * &name means netgroup
31 * +name means unix group
32 * + and & may be combined
35 static bool do_group_checks(const char **name, const char **pattern)
37 if ((*name)[0] == '@') {
38 *pattern = "&+";
39 *name += 1;
40 return True;
43 if (((*name)[0] == '+') && ((*name)[1] == '&')) {
44 *pattern = "+&";
45 *name += 2;
46 return True;
49 if ((*name)[0] == '+') {
50 *pattern = "+";
51 *name += 1;
52 return True;
55 if (((*name)[0] == '&') && ((*name)[1] == '+')) {
56 *pattern = "&+";
57 *name += 2;
58 return True;
61 if ((*name)[0] == '&') {
62 *pattern = "&";
63 *name += 1;
64 return True;
67 return False;
70 static bool token_contains_name(TALLOC_CTX *mem_ctx,
71 const char *username,
72 const char *domain,
73 const char *sharename,
74 const struct security_token *token,
75 const char *name)
77 const char *prefix;
78 struct dom_sid sid;
79 enum lsa_SidType type;
81 if (username != NULL) {
82 name = talloc_sub_basic(mem_ctx, username, domain, name);
84 if (sharename != NULL) {
85 name = talloc_string_sub(mem_ctx, name, "%S", sharename);
88 if (name == NULL) {
89 /* This is too security sensitive, better panic than return a
90 * result that might be interpreted in a wrong way. */
91 smb_panic("substitutions failed");
94 /* check to see is we already have a SID */
96 if ( string_to_sid( &sid, name ) ) {
97 DEBUG(5,("token_contains_name: Checking for SID [%s] in token\n", name));
98 return nt_token_check_sid( &sid, token );
101 if (!do_group_checks(&name, &prefix)) {
102 if (!lookup_name_smbconf(mem_ctx, name, LOOKUP_NAME_ALL,
103 NULL, NULL, &sid, &type)) {
104 DEBUG(5, ("lookup_name %s failed\n", name));
105 return False;
107 if (type != SID_NAME_USER) {
108 DEBUG(5, ("%s is a %s, expected a user\n",
109 name, sid_type_lookup(type)));
110 return False;
112 return nt_token_check_sid(&sid, token);
115 for (/* initialized above */ ; *prefix != '\0'; prefix++) {
116 if (*prefix == '+') {
117 if (!lookup_name_smbconf(mem_ctx, name,
118 LOOKUP_NAME_ALL|LOOKUP_NAME_GROUP,
119 NULL, NULL, &sid, &type)) {
120 DEBUG(5, ("lookup_name %s failed\n", name));
121 return False;
123 if ((type != SID_NAME_DOM_GRP) &&
124 (type != SID_NAME_ALIAS) &&
125 (type != SID_NAME_WKN_GRP)) {
126 DEBUG(5, ("%s is a %s, expected a group\n",
127 name, sid_type_lookup(type)));
128 return False;
130 if (nt_token_check_sid(&sid, token)) {
131 return True;
133 continue;
135 if (*prefix == '&') {
136 if (username) {
137 if (user_in_netgroup(mem_ctx, username, name)) {
138 return True;
141 continue;
143 smb_panic("got invalid prefix from do_groups_check");
145 return False;
149 * Check whether a user is contained in the list provided.
151 * Please note that the user name and share names passed in here mainly for
152 * the substitution routines that expand the parameter values, the decision
153 * whether a user is in the list is done after a lookup_name on the expanded
154 * parameter value, solely based on comparing the SIDs in token.
156 * The other use is the netgroup check when using @group or &group.
159 bool token_contains_name_in_list(const char *username,
160 const char *domain,
161 const char *sharename,
162 const struct security_token *token,
163 const char **list)
165 if (list == NULL) {
166 return False;
168 while (*list != NULL) {
169 TALLOC_CTX *frame = talloc_stackframe();
170 bool ret;
172 ret = token_contains_name(frame, username, domain, sharename,
173 token, *list);
174 TALLOC_FREE(frame);
175 if (ret) {
176 return true;
178 list += 1;
180 return False;
184 * Check whether the user described by "token" has access to share snum.
186 * This looks at "invalid users", "valid users" and "only user/username"
188 * Please note that the user name and share names passed in here mainly for
189 * the substitution routines that expand the parameter values, the decision
190 * whether a user is in the list is done after a lookup_name on the expanded
191 * parameter value, solely based on comparing the SIDs in token.
193 * The other use is the netgroup check when using @group or &group.
196 bool user_ok_token(const char *username, const char *domain,
197 const struct security_token *token, int snum)
199 if (lp_invalid_users(snum) != NULL) {
200 if (token_contains_name_in_list(username, domain,
201 lp_servicename(talloc_tos(), snum),
202 token,
203 lp_invalid_users(snum))) {
204 DEBUG(10, ("User %s in 'invalid users'\n", username));
205 return False;
209 if (lp_valid_users(snum) != NULL) {
210 if (!token_contains_name_in_list(username, domain,
211 lp_servicename(talloc_tos(), snum),
212 token,
213 lp_valid_users(snum))) {
214 DEBUG(10, ("User %s not in 'valid users'\n",
215 username));
216 return False;
220 if (lp_onlyuser(snum)) {
221 const char *list[2];
222 list[0] = lp_username(talloc_tos(), snum);
223 list[1] = NULL;
224 if ((list[0] == NULL) || (*list[0] == '\0')) {
225 DEBUG(0, ("'only user = yes' and no 'username ='\n"));
226 return False;
228 if (!token_contains_name_in_list(NULL, domain,
229 lp_servicename(talloc_tos(), snum),
230 token, list)) {
231 DEBUG(10, ("%s != 'username'\n", username));
232 return False;
236 DEBUG(10, ("user_ok_token: share %s is ok for unix user %s\n",
237 lp_servicename(talloc_tos(), snum), username));
239 return True;
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,
257 const char *domain,
258 const struct security_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(talloc_tos(), snum),
267 token,
268 lp_readlist(snum))) {
269 result = True;
273 if (lp_writelist(snum) != NULL) {
274 if (token_contains_name_in_list(username, domain,
275 lp_servicename(talloc_tos(), snum),
276 token,
277 lp_writelist(snum))) {
278 result = False;
282 DEBUG(10,("is_share_read_only_for_user: share %s is %s for unix user "
283 "%s\n", lp_servicename(talloc_tos(), snum),
284 result ? "read-only" : "read-write", username));
286 return result;