--- /dev/null
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+ This file is part of systemd.
+
+ Copyright 2011 Lennart Poettering
+
+ systemd 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 2 of the License, or
+ (at your option) any later version.
+
+ systemd 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 systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <assert.h>
+#include <sys/acl.h>
+#include <acl/libacl.h>
+#include <errno.h>
+#include <string.h>
+
+#include "logind-acl.h"
+#include "util.h"
+
+static int find_acl(acl_t acl, uid_t uid, acl_entry_t *entry) {
+ acl_entry_t i;
+ int found;
+
+ assert(acl);
+ assert(entry);
+
+ for (found = acl_get_entry(acl, ACL_FIRST_ENTRY, &i);
+ found > 0;
+ found = acl_get_entry(acl, ACL_NEXT_ENTRY, &i)) {
+
+ acl_tag_t tag;
+ uid_t *u;
+ bool b;
+
+ if (acl_get_tag_type(i, &tag) < 0)
+ return -errno;
+
+ if (tag != ACL_USER)
+ continue;
+
+ u = acl_get_qualifier(i);
+ if (!u)
+ return -errno;
+
+ b = *u == uid;
+ free(u);
+
+ if (b) {
+ *entry = i;
+ return 1;
+ }
+ }
+
+ if (found < 0)
+ return -errno;
+
+ return 0;
+}
+
+static int flush_acl(acl_t acl) {
+ acl_entry_t i;
+ int found;
+ bool changed = false;
+
+ assert(acl);
+
+ for (found = acl_get_entry(acl, ACL_FIRST_ENTRY, &i);
+ found > 0;
+ found = acl_get_entry(acl, ACL_NEXT_ENTRY, &i)) {
+
+ acl_tag_t tag;
+
+ if (acl_get_tag_type(i, &tag) < 0)
+ return -errno;
+
+ if (tag != ACL_USER)
+ continue;
+
+ if (acl_delete_entry(acl, i) < 0)
+ return -errno;
+
+ changed = true;
+ }
+
+ if (found < 0)
+ return -errno;
+
+ return changed;
+}
+
+int devnode_acl(const char *path,
+ bool flush,
+ bool del, uid_t old_uid,
+ bool add, uid_t new_uid) {
+
+ acl_t acl;
+ int r;
+ bool changed = false;
+
+ assert(path);
+
+ acl = acl_get_file(path, ACL_TYPE_ACCESS);
+ if (!acl)
+ return -errno;
+
+ if (flush) {
+
+ r = flush_acl(acl);
+ if (r < 0)
+ goto finish;
+ if (r > 0)
+ changed = true;
+
+ } else if (del && old_uid > 0) {
+ acl_entry_t entry;
+
+ r = find_acl(acl, old_uid, &entry);
+ if (r < 0)
+ goto finish;
+
+ if (r > 0) {
+ if (acl_delete_entry(acl, entry) < 0) {
+ r = -errno;
+ goto finish;
+ }
+
+ changed = true;
+ }
+ }
+
+ if (add && new_uid > 0) {
+ acl_entry_t entry;
+ acl_permset_t permset;
+ int rd, wt;
+
+ r = find_acl(acl, new_uid, &entry);
+ if (r < 0)
+ goto finish;
+
+ if (r == 0) {
+ if (acl_create_entry(&acl, &entry) < 0) {
+ r = -errno;
+ goto finish;
+ }
+
+ if (acl_set_tag_type(entry, ACL_USER) < 0 ||
+ acl_set_qualifier(entry, &new_uid) < 0) {
+ r = -errno;
+ goto finish;
+ }
+ }
+
+ if (acl_get_permset(entry, &permset) < 0) {
+ r = -errno;
+ goto finish;
+ }
+
+ rd = acl_get_perm(permset, ACL_READ);
+ if (rd < 0) {
+ r = -errno;
+ goto finish;
+ }
+
+ wt = acl_get_perm(permset, ACL_WRITE);
+ if (wt < 0) {
+ r = -errno;
+ goto finish;
+ }
+
+ if (!rd || !wt) {
+
+ if (acl_add_perm(permset, ACL_READ|ACL_WRITE) < 0) {
+ r = -errno;
+ goto finish;
+ }
+
+ changed = true;
+ }
+ }
+
+ if (!changed)
+ goto finish;
+
+ if (acl_calc_mask(&acl) < 0) {
+ r = -errno;
+ goto finish;
+ }
+
+ if (acl_set_file(path, ACL_TYPE_ACCESS, acl) < 0) {
+ r = -errno;
+ goto finish;
+ }
+
+ r = 0;
+
+finish:
+ acl_free(acl);
+
+ return r;
+}
+
+int devnode_acl_all(struct udev *udev,
+ const char *seat,
+ bool flush,
+ bool del, uid_t old_uid,
+ bool add, uid_t new_uid) {
+
+ struct udev_list_entry *item = NULL, *first = NULL;
+ struct udev_enumerate *e;
+ int r;
+
+ assert(udev);
+
+ if (!seat)
+ seat = "seat0";
+
+ e = udev_enumerate_new(udev);
+ if (!e)
+ return -ENOMEM;
+
+ r = udev_enumerate_add_match_tag(e, "uaccess");
+ if (r < 0)
+ goto finish;
+
+ r = udev_enumerate_add_match_tag(e, seat);
+ if (r < 0)
+ goto finish;
+
+ r = udev_enumerate_scan_devices(e);
+ if (r < 0)
+ goto finish;
+
+ first = udev_enumerate_get_list_entry(e);
+ udev_list_entry_foreach(item, first) {
+ struct udev_device *d;
+ const char *node, *sn;
+
+ d = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item));
+ if (!d) {
+ r = -ENOMEM;
+ goto finish;
+ }
+
+ sn = udev_device_get_property_value(d, "SEAT");
+ if (!sn)
+ sn = "seat0";
+
+ if (!streq(seat, sn)) {
+ udev_device_unref(d);
+ continue;
+ }
+
+ node = udev_device_get_devnode(d);
+ udev_device_unref(d);
+
+ if (!node) {
+ r = -ENOMEM;
+ goto finish;
+ }
+
+ r = devnode_acl(node, flush, del, old_uid, add, new_uid);
+ if (r < 0)
+ goto finish;
+ }
+
+finish:
+ if (e)
+ udev_enumerate_unref(e);
+
+ return r;
+}
~ianmdlvl / elogind.git / blobdiff