+++ /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"
-#include "acl-util.h"
-
-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 = 0;
- 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 = acl_find_uid(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 = acl_find_uid(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 (isempty(seat))
- seat = "seat0";
-
- e = udev_enumerate_new(udev);
- if (!e)
- return -ENOMEM;
-
- /* We can only match by one tag in libudev. We choose
- * "uaccess" for that. If we could match for two tags here we
- * could add the seat name as second match tag, but this would
- * be hardly optimizable in libudev, and hence checking the
- * second tag manually in our loop is a good solution. */
-
- r = udev_enumerate_add_match_tag(e, "uaccess");
- 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, "ID_SEAT");
- if (isempty(sn))
- sn = "seat0";
-
- if (!streq(seat, sn)) {
- udev_device_unref(d);
- continue;
- }
-
- node = udev_device_get_devnode(d);
- if (!node) {
- /* In case people mistag devices with nodes, we need to ignore this */
- udev_device_unref(d);
- continue;
- }
-
- log_debug("Fixing up %s for seat %s...", node, sn);
-
- r = devnode_acl(node, flush, del, old_uid, add, new_uid);
- udev_device_unref(d);
-
- if (r < 0)
- goto finish;
- }
-
-finish:
- if (e)
- udev_enumerate_unref(e);
-
- return r;
-}
~ianmdlvl / elogind.git / blobdiff