2 This file is part of systemd.
4 Copyright 2011,2013 Lennart Poettering
6 systemd is free software; you can redistribute it and/or modify it
7 under the terms of the GNU Lesser General Public License as published by
8 the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version.
11 systemd is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public License
17 along with systemd; If not, see <http://www.gnu.org/licenses/>.
24 #include "alloc-util.h"
25 #include "string-util.h"
27 #include "user-util.h"
30 int acl_find_uid(acl_t acl, uid_t uid, acl_entry_t *entry) {
37 for (r = acl_get_entry(acl, ACL_FIRST_ENTRY, &i);
39 r = acl_get_entry(acl, ACL_NEXT_ENTRY, &i)) {
45 if (acl_get_tag_type(i, &tag) < 0)
51 u = acl_get_qualifier(i);
69 #if 0 /// UNNEEDED by elogind
70 int calc_acl_mask_if_needed(acl_t *acl_p) {
77 for (r = acl_get_entry(*acl_p, ACL_FIRST_ENTRY, &i);
79 r = acl_get_entry(*acl_p, ACL_NEXT_ENTRY, &i)) {
82 if (acl_get_tag_type(i, &tag) < 0)
88 if (IN_SET(tag, ACL_USER, ACL_GROUP))
94 if (need && acl_calc_mask(acl_p) < 0)
100 int add_base_acls_if_needed(acl_t *acl_p, const char *path) {
103 bool have_user_obj = false, have_group_obj = false, have_other = false;
105 _cleanup_(acl_freep) acl_t basic = NULL;
109 for (r = acl_get_entry(*acl_p, ACL_FIRST_ENTRY, &i);
111 r = acl_get_entry(*acl_p, ACL_NEXT_ENTRY, &i)) {
114 if (acl_get_tag_type(i, &tag) < 0)
117 if (tag == ACL_USER_OBJ)
118 have_user_obj = true;
119 else if (tag == ACL_GROUP_OBJ)
120 have_group_obj = true;
121 else if (tag == ACL_OTHER)
123 if (have_user_obj && have_group_obj && have_other)
133 basic = acl_from_mode(st.st_mode);
137 for (r = acl_get_entry(basic, ACL_FIRST_ENTRY, &i);
139 r = acl_get_entry(basic, ACL_NEXT_ENTRY, &i)) {
143 if (acl_get_tag_type(i, &tag) < 0)
146 if ((tag == ACL_USER_OBJ && have_user_obj) ||
147 (tag == ACL_GROUP_OBJ && have_group_obj) ||
148 (tag == ACL_OTHER && have_other))
151 r = acl_create_entry(acl_p, &dst);
155 r = acl_copy_entry(dst, i);
164 int acl_search_groups(const char *path, char ***ret_groups) {
165 _cleanup_strv_free_ char **g = NULL;
166 _cleanup_(acl_freep) acl_t acl = NULL;
173 acl = acl_get_file(path, ACL_TYPE_DEFAULT);
177 r = acl_get_entry(acl, ACL_FIRST_ENTRY, &entry);
179 _cleanup_(acl_free_gid_tpp) gid_t *gid = NULL;
187 if (acl_get_tag_type(entry, &tag) < 0)
190 if (tag != ACL_GROUP)
193 gid = acl_get_qualifier(entry);
197 if (in_gid(*gid) > 0) {
207 name = gid_to_name(*gid);
211 r = strv_consume(&g, name);
217 r = acl_get_entry(acl, ACL_NEXT_ENTRY, &entry);
228 int parse_acl(const char *text, acl_t *acl_access, acl_t *acl_default, bool want_mask) {
229 _cleanup_free_ char **a = NULL, **d = NULL; /* strings are not be freed */
230 _cleanup_strv_free_ char **split;
233 _cleanup_(acl_freep) acl_t a_acl = NULL, d_acl = NULL;
235 split = strv_split(text, ",");
239 STRV_FOREACH(entry, split) {
242 p = startswith(*entry, "default:");
244 p = startswith(*entry, "d:");
247 r = strv_push(&d, p);
249 r = strv_push(&a, *entry);
254 if (!strv_isempty(a)) {
255 _cleanup_free_ char *join;
257 join = strv_join(a, ",");
261 a_acl = acl_from_text(join);
266 r = calc_acl_mask_if_needed(&a_acl);
272 if (!strv_isempty(d)) {
273 _cleanup_free_ char *join;
275 join = strv_join(d, ",");
279 d_acl = acl_from_text(join);
284 r = calc_acl_mask_if_needed(&d_acl);
291 *acl_default = d_acl;
292 a_acl = d_acl = NULL;
297 static int acl_entry_equal(acl_entry_t a, acl_entry_t b) {
298 acl_tag_t tag_a, tag_b;
300 if (acl_get_tag_type(a, &tag_a) < 0)
303 if (acl_get_tag_type(b, &tag_b) < 0)
314 /* can have only one of those */
317 _cleanup_(acl_free_uid_tpp) uid_t *uid_a = NULL, *uid_b = NULL;
319 uid_a = acl_get_qualifier(a);
323 uid_b = acl_get_qualifier(b);
327 return *uid_a == *uid_b;
330 _cleanup_(acl_free_gid_tpp) gid_t *gid_a = NULL, *gid_b = NULL;
332 gid_a = acl_get_qualifier(a);
336 gid_b = acl_get_qualifier(b);
340 return *gid_a == *gid_b;
343 assert_not_reached("Unknown acl tag type");
347 static int find_acl_entry(acl_t acl, acl_entry_t entry, acl_entry_t *out) {
351 for (r = acl_get_entry(acl, ACL_FIRST_ENTRY, &i);
353 r = acl_get_entry(acl, ACL_NEXT_ENTRY, &i)) {
355 r = acl_entry_equal(i, entry);
368 int acls_for_file(const char *path, acl_type_t type, acl_t new, acl_t *acl) {
369 _cleanup_(acl_freep) acl_t old;
373 old = acl_get_file(path, type);
377 for (r = acl_get_entry(new, ACL_FIRST_ENTRY, &i);
379 r = acl_get_entry(new, ACL_NEXT_ENTRY, &i)) {
383 r = find_acl_entry(old, i, &j);
387 if (acl_create_entry(&old, &j) < 0)
390 if (acl_copy_entry(j, i) < 0)
401 int add_acls_for_user(int fd, uid_t uid) {
402 _cleanup_(acl_freep) acl_t acl = NULL;
404 acl_permset_t permset;
407 acl = acl_get_fd(fd);
411 r = acl_find_uid(acl, uid, &entry);
413 if (acl_create_entry(&acl, &entry) < 0 ||
414 acl_set_tag_type(entry, ACL_USER) < 0 ||
415 acl_set_qualifier(entry, &uid) < 0)
419 /* We do not recalculate the mask unconditionally here,
420 * so that the fchmod() mask above stays intact. */
421 if (acl_get_permset(entry, &permset) < 0 ||
422 acl_add_perm(permset, ACL_READ) < 0)
425 r = calc_acl_mask_if_needed(&acl);
429 return acl_set_fd(fd, acl);