./tools/notsd-move

1 files changed, 293 insertions, 0 deletions

diff --git a/src/grp-login/systemd-logind/logind-acl.c b/src/grp-login/systemd-logind/logind-acl.c
new file mode 100644
index 0000000000..9261e59122
--- /dev/null
+++ b/src/grp-login/systemd-logind/logind-acl.c
@@ -0,0 +1,293 @@
+/***
+  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 Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 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
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <errno.h>
+#include <string.h>
+
+#include "systemd-basic/alloc-util.h"
+#include "systemd-basic/dirent-util.h"
+#include "systemd-basic/escape.h"
+#include "systemd-basic/fd-util.h"
+#include "systemd-basic/formats-util.h"
+#include "systemd-basic/set.h"
+#include "systemd-basic/string-util.h"
+#include "systemd-basic/util.h"
+#include "systemd-shared/acl-util.h"
+#include "systemd-shared/udev-util.h"
+
+#include "logind-acl.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) {
+
+        _cleanup_udev_enumerate_unref_ struct udev_enumerate *e = NULL;
+        struct udev_list_entry *item = NULL, *first = NULL;
+        _cleanup_set_free_free_ Set *nodes = NULL;
+        _cleanup_closedir_ DIR *dir = NULL;
+        struct dirent *dent;
+        Iterator i;
+        char *n;
+        int r;
+
+        assert(udev);
+
+        nodes = set_new(&string_hash_ops);
+        if (!nodes)
+                return -ENOMEM;
+
+        e = udev_enumerate_new(udev);
+        if (!e)
+                return -ENOMEM;
+
+        if (isempty(seat))
+                seat = "seat0";
+
+        /* 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)
+                return r;
+
+        r = udev_enumerate_add_match_is_initialized(e);
+        if (r < 0)
+                return r;
+
+        r = udev_enumerate_scan_devices(e);
+        if (r < 0)
+                return r;
+
+        first = udev_enumerate_get_list_entry(e);
+        udev_list_entry_foreach(item, first) {
+                _cleanup_udev_device_unref_ struct udev_device *d = NULL;
+                const char *node, *sn;
+
+                d = udev_device_new_from_syspath(udev, udev_list_entry_get_name(item));
+                if (!d)
+                        return -ENOMEM;
+
+                sn = udev_device_get_property_value(d, "ID_SEAT");
+                if (isempty(sn))
+                        sn = "seat0";
+
+                if (!streq(seat, sn))
+                        continue;
+
+                node = udev_device_get_devnode(d);
+                /* In case people mistag devices with nodes, we need to ignore this */
+                if (!node)
+                        continue;
+
+                n = strdup(node);
+                if (!n)
+                        return -ENOMEM;
+
+                log_debug("Found udev node %s for seat %s", n, seat);
+                r = set_consume(nodes, n);
+                if (r < 0)
+                        return r;
+        }
+
+        /* udev exports "dead" device nodes to allow module on-demand loading,
+         * these devices are not known to the kernel at this moment */
+        dir = opendir("/run/udev/static_node-tags/uaccess");
+        if (dir) {
+                FOREACH_DIRENT(dent, dir, return -errno) {
+                        _cleanup_free_ char *unescaped_devname = NULL;
+
+                        if (cunescape(dent->d_name, UNESCAPE_RELAX, &unescaped_devname) < 0)
+                                return -ENOMEM;
+
+                        n = strappend("/dev/", unescaped_devname);
+                        if (!n)
+                                return -ENOMEM;
+
+                        log_debug("Found static node %s for seat %s", n, seat);
+                        r = set_consume(nodes, n);
+                        if (r == -EEXIST)
+                                continue;
+                        if (r < 0)
+                                return r;
+                }
+        }
+
+        r = 0;
+        SET_FOREACH(n, nodes, i) {
+                int k;
+
+                log_debug("Changing ACLs at %s for seat %s (uid "UID_FMT"→"UID_FMT"%s%s)",
+                          n, seat, old_uid, new_uid,
+                          del ? " del" : "", add ? " add" : "");
+
+                k = devnode_acl(n, flush, del, old_uid, add, new_uid);
+                if (k == -ENOENT)
+                        log_debug("Device %s disappeared while setting ACLs", n);
+                else if (k < 0 && r == 0)
+                        r = k;
+        }
+
+        return r;
+}