core: rearrange code so that libsystemd/sd-bus/ does not include header files from core

Stuff in src/shared or src/libsystemd should *never* include code from
src/core or any of the tools, so don't do that here either. It's not OK!

1 files changed, 1050 insertions, 0 deletions

diff --git a/src/bus-proxyd/bus-xml-policy.c b/src/bus-proxyd/bus-xml-policy.c
new file mode 100644
index 000000000..ac0e14b4f
--- /dev/null
+++ b/src/bus-proxyd/bus-xml-policy.c
@@ -0,0 +1,1050 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+/***
+  This file is part of systemd.
+
+  Copyright 2013 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 "xml.h"
+#include "fileio.h"
+#include "strv.h"
+#include "conf-files.h"
+#include "bus-internal.h"
+#include "bus-message.h"
+#include "bus-xml-policy.h"
+
+static void policy_item_free(PolicyItem *i) {
+        assert(i);
+
+        free(i->interface);
+        free(i->member);
+        free(i->error);
+        free(i->name);
+        free(i->path);
+        free(i);
+}
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(PolicyItem*, policy_item_free);
+
+static void item_append(PolicyItem *i, PolicyItem **list) {
+
+        PolicyItem *tail;
+
+        LIST_FIND_TAIL(items, *list, tail);
+        LIST_INSERT_AFTER(items, *list, tail, i);
+}
+
+static int file_load(Policy *p, const char *path) {
+
+        _cleanup_free_ char *c = NULL, *policy_user = NULL, *policy_group = NULL;
+        _cleanup_(policy_item_freep) PolicyItem *i = NULL;
+        void *xml_state = NULL;
+        unsigned n_other = 0;
+        const char *q;
+        int r;
+
+        enum {
+                STATE_OUTSIDE,
+                STATE_BUSCONFIG,
+                STATE_POLICY,
+                STATE_POLICY_CONTEXT,
+                STATE_POLICY_USER,
+                STATE_POLICY_GROUP,
+                STATE_POLICY_OTHER_ATTRIBUTE,
+                STATE_ALLOW_DENY,
+                STATE_ALLOW_DENY_INTERFACE,
+                STATE_ALLOW_DENY_MEMBER,
+                STATE_ALLOW_DENY_ERROR,
+                STATE_ALLOW_DENY_PATH,
+                STATE_ALLOW_DENY_MESSAGE_TYPE,
+                STATE_ALLOW_DENY_NAME,
+                STATE_ALLOW_DENY_OTHER_ATTRIBUTE,
+                STATE_OTHER,
+        } state = STATE_OUTSIDE;
+
+        enum {
+                POLICY_CATEGORY_NONE,
+                POLICY_CATEGORY_DEFAULT,
+                POLICY_CATEGORY_MANDATORY,
+                POLICY_CATEGORY_USER,
+                POLICY_CATEGORY_GROUP
+        } policy_category = POLICY_CATEGORY_NONE;
+
+        unsigned line = 0;
+
+        assert(p);
+
+        r = read_full_file(path, &c, NULL);
+        if (r < 0) {
+                if (r == -ENOENT)
+                        return 0;
+                if (r == -EISDIR)
+                        return r;
+
+                return log_error_errno(r, "Failed to load %s: %m", path);
+        }
+
+        q = c;
+        for (;;) {
+                _cleanup_free_ char *name = NULL;
+                int t;
+
+                t = xml_tokenize(&q, &name, &xml_state, &line);
+                if (t < 0)
+                        return log_error_errno(t, "XML parse failure in %s: %m", path);
+
+                switch (state) {
+
+                case STATE_OUTSIDE:
+
+                        if (t == XML_TAG_OPEN) {
+                                if (streq(name, "busconfig"))
+                                        state = STATE_BUSCONFIG;
+                                else {
+                                        log_error("Unexpected tag %s at %s:%u.", name, path, line);
+                                        return -EINVAL;
+                                }
+
+                        } else if (t == XML_END)
+                                return 0;
+                        else if (t != XML_TEXT || !in_charset(name, WHITESPACE)) {
+                                log_error("Unexpected token (1) at %s:%u.", path, line);
+                                return -EINVAL;
+                        }
+
+                        break;
+
+                case STATE_BUSCONFIG:
+
+                        if (t == XML_TAG_OPEN) {
+                                if (streq(name, "policy")) {
+                                        state = STATE_POLICY;
+                                        policy_category = POLICY_CATEGORY_NONE;
+                                        free(policy_user);
+                                        free(policy_group);
+                                        policy_user = policy_group = NULL;
+                                } else {
+                                        state = STATE_OTHER;
+                                        n_other = 0;
+                                }
+                        } else if (t == XML_TAG_CLOSE_EMPTY ||
+                                   (t == XML_TAG_CLOSE && streq(name, "busconfig")))
+                                state = STATE_OUTSIDE;
+                        else if (t != XML_TEXT || !in_charset(name, WHITESPACE)) {
+                                log_error("Unexpected token (2) at %s:%u.", path, line);
+                                return -EINVAL;
+                        }
+
+                        break;
+
+                case STATE_POLICY:
+
+                        if (t == XML_ATTRIBUTE_NAME) {
+                                if (streq(name, "context"))
+                                        state = STATE_POLICY_CONTEXT;
+                                else if (streq(name, "user"))
+                                        state = STATE_POLICY_USER;
+                                else if (streq(name, "group"))
+                                        state = STATE_POLICY_GROUP;
+                                else {
+                                        if (streq(name, "at_console"))
+                                                log_debug("Attribute %s of <policy> tag unsupported at %s:%u, ignoring.", name, path, line);
+                                        else
+                                                log_warning("Attribute %s of <policy> tag unknown at %s:%u, ignoring.", name, path, line);
+                                        state = STATE_POLICY_OTHER_ATTRIBUTE;
+                                }
+                        } else if (t == XML_TAG_CLOSE_EMPTY ||
+                                   (t == XML_TAG_CLOSE && streq(name, "policy")))
+                                state = STATE_BUSCONFIG;
+                        else if (t == XML_TAG_OPEN) {
+                                PolicyItemType it;
+
+                                if (streq(name, "allow"))
+                                        it = POLICY_ITEM_ALLOW;
+                                else if (streq(name, "deny"))
+                                        it = POLICY_ITEM_DENY;
+                                else {
+                                        log_warning("Unknown tag %s in <policy> %s:%u.", name, path, line);
+                                        return -EINVAL;
+                                }
+
+                                assert(!i);
+                                i = new0(PolicyItem, 1);
+                                if (!i)
+                                        return log_oom();
+
+                                i->type = it;
+                                state = STATE_ALLOW_DENY;
+
+                        } else if (t != XML_TEXT || !in_charset(name, WHITESPACE)) {
+                                log_error("Unexpected token (3) at %s:%u.", path, line);
+                                return -EINVAL;
+                        }
+
+                        break;
+
+                case STATE_POLICY_CONTEXT:
+
+                        if (t == XML_ATTRIBUTE_VALUE) {
+                                if (streq(name, "default")) {
+                                        policy_category = POLICY_CATEGORY_DEFAULT;
+                                        state = STATE_POLICY;
+                                } else if (streq(name, "mandatory")) {
+                                        policy_category = POLICY_CATEGORY_MANDATORY;
+                                        state = STATE_POLICY;
+                                } else {
+                                        log_error("context= parameter %s unknown for <policy> at %s:%u.", name, path, line);
+                                        return -EINVAL;
+                                }
+                        } else {
+                                log_error("Unexpected token (4) at %s:%u.", path, line);
+                                return -EINVAL;
+                        }
+
+                        break;
+
+                case STATE_POLICY_USER:
+
+                        if (t == XML_ATTRIBUTE_VALUE) {
+                                free(policy_user);
+                                policy_user = name;
+                                name = NULL;
+                                policy_category = POLICY_CATEGORY_USER;
+                                state = STATE_POLICY;
+                        } else {
+                                log_error("Unexpected token (5) in %s:%u.", path, line);
+                                return -EINVAL;
+                        }
+
+                        break;
+
+                case STATE_POLICY_GROUP:
+
+                        if (t == XML_ATTRIBUTE_VALUE) {
+                                free(policy_group);
+                                policy_group = name;
+                                name = NULL;
+                                policy_category = POLICY_CATEGORY_GROUP;
+                                state = STATE_POLICY;
+                        } else {
+                                log_error("Unexpected token (6) at %s:%u.", path, line);
+                                return -EINVAL;
+                        }
+
+                        break;
+
+                case STATE_POLICY_OTHER_ATTRIBUTE:
+
+                        if (t == XML_ATTRIBUTE_VALUE)
+                                state = STATE_POLICY;
+                        else {
+                                log_error("Unexpected token (7) in %s:%u.", path, line);
+                                return -EINVAL;
+                        }
+
+                        break;
+
+                case STATE_ALLOW_DENY:
+
+                        assert(i);
+
+                        if (t == XML_ATTRIBUTE_NAME) {
+                                PolicyItemClass ic;
+
+                                if (startswith(name, "send_"))
+                                        ic = POLICY_ITEM_SEND;
+                                else if (startswith(name, "receive_"))
+                                        ic = POLICY_ITEM_RECV;
+                                else if (streq(name, "own"))
+                                        ic = POLICY_ITEM_OWN;
+                                else if (streq(name, "own_prefix"))
+                                        ic = POLICY_ITEM_OWN_PREFIX;
+                                else if (streq(name, "user"))
+                                        ic = POLICY_ITEM_USER;
+                                else if (streq(name, "group"))
+                                        ic = POLICY_ITEM_GROUP;
+                                else if (streq(name, "eavesdrop")) {
+                                        log_debug("Unsupported attribute %s= at %s:%u, ignoring.", name, path, line);
+                                        i->class = POLICY_ITEM_IGNORE;
+                                        state = STATE_ALLOW_DENY_OTHER_ATTRIBUTE;
+                                        break;
+                                } else {
+                                        log_error("Unknown attribute %s= at %s:%u, ignoring.", name, path, line);
+                                        state = STATE_ALLOW_DENY_OTHER_ATTRIBUTE;
+                                        break;
+                                }
+
+                                if (i->class != _POLICY_ITEM_CLASS_UNSET && ic != i->class) {
+                                        log_error("send_ and receive_ fields mixed on same tag at %s:%u.", path, line);
+                                        return -EINVAL;
+                                }
+
+                                i->class = ic;
+
+                                if (ic == POLICY_ITEM_SEND || ic == POLICY_ITEM_RECV) {
+                                        const char *u;
+
+                                        u = strchr(name, '_');
+                                        assert(u);
+
+                                        u++;
+
+                                        if (streq(u, "interface"))
+                                                state = STATE_ALLOW_DENY_INTERFACE;
+                                        else if (streq(u, "member"))
+                                                state = STATE_ALLOW_DENY_MEMBER;
+                                        else if (streq(u, "error"))
+                                                state = STATE_ALLOW_DENY_ERROR;
+                                        else if (streq(u, "path"))
+                                                state = STATE_ALLOW_DENY_PATH;
+                                        else if (streq(u, "type"))
+                                                state = STATE_ALLOW_DENY_MESSAGE_TYPE;
+                                        else if ((streq(u, "destination") && ic == POLICY_ITEM_SEND) ||
+                                                 (streq(u, "sender") && ic == POLICY_ITEM_RECV))
+                                                state = STATE_ALLOW_DENY_NAME;
+                                        else {
+                                                if (streq(u, "requested_reply"))
+                                                        log_debug("Unsupported attribute %s= at %s:%u, ignoring.", name, path, line);
+                                                else
+                                                        log_error("Unknown attribute %s= at %s:%u, ignoring.", name, path, line);
+                                                state = STATE_ALLOW_DENY_OTHER_ATTRIBUTE;
+                                                break;
+                                        }
+                                } else
+                                        state = STATE_ALLOW_DENY_NAME;
+
+                        } else if (t == XML_TAG_CLOSE_EMPTY ||
+                                   (t == XML_TAG_CLOSE && streq(name, i->type == POLICY_ITEM_ALLOW ? "allow" : "deny"))) {
+
+                                if (i->class == _POLICY_ITEM_CLASS_UNSET) {
+                                        log_error("Policy not set at %s:%u.", path, line);
+                                        return -EINVAL;
+                                }
+
+                                if (policy_category == POLICY_CATEGORY_DEFAULT)
+                                        item_append(i, &p->default_items);
+                                else if (policy_category == POLICY_CATEGORY_MANDATORY)
+                                        item_append(i, &p->mandatory_items);
+                                else if (policy_category == POLICY_CATEGORY_USER) {
+                                        const char *u = policy_user;
+
+                                        assert_cc(sizeof(uid_t) == sizeof(uint32_t));
+
+                                        r = hashmap_ensure_allocated(&p->user_items, NULL);
+                                        if (r < 0)
+                                                return log_oom();
+
+                                        if (!u) {
+                                                log_error("User policy without name");
+                                                return -EINVAL;
+                                        }
+
+                                        r = get_user_creds(&u, &i->uid, NULL, NULL, NULL);
+                                        if (r < 0) {
+                                                log_error_errno(r, "Failed to resolve user %s, ignoring policy: %m", u);
+                                                free(i);
+                                        } else {
+                                                PolicyItem *first;
+
+                                                first = hashmap_get(p->user_items, UINT32_TO_PTR(i->uid));
+                                                item_append(i, &first);
+                                                i->uid_valid = true;
+
+                                                r = hashmap_replace(p->user_items, UINT32_TO_PTR(i->uid), first);
+                                                if (r < 0) {
+                                                        LIST_REMOVE(items, first, i);
+                                                        return log_oom();
+                                                }
+                                        }
+
+                                } else if (policy_category == POLICY_CATEGORY_GROUP) {
+                                        const char *g = policy_group;
+
+                                        assert_cc(sizeof(gid_t) == sizeof(uint32_t));
+
+                                        r = hashmap_ensure_allocated(&p->group_items, NULL);
+                                        if (r < 0)
+                                                return log_oom();
+
+                                        if (!g) {
+                                                log_error("Group policy without name");
+                                                return -EINVAL;
+                                        }
+
+                                        r = get_group_creds(&g, &i->gid);
+                                        if (r < 0) {
+                                                log_error_errno(r, "Failed to resolve group %s, ignoring policy: %m", g);
+                                                free(i);
+                                        } else {
+                                                PolicyItem *first;
+
+                                                first = hashmap_get(p->group_items, UINT32_TO_PTR(i->gid));
+                                                item_append(i, &first);
+                                                i->gid_valid = true;
+
+                                                r = hashmap_replace(p->group_items, UINT32_TO_PTR(i->gid), first);
+                                                if (r < 0) {
+                                                        LIST_REMOVE(items, first, i);
+                                                        return log_oom();
+                                                }
+                                        }
+                                }
+
+                                state = STATE_POLICY;
+                                i = NULL;
+
+                        } else if (t != XML_TEXT || !in_charset(name, WHITESPACE)) {
+                                log_error("Unexpected token (8) at %s:%u.", path, line);
+                                return -EINVAL;
+                        }
+
+                        break;
+
+                case STATE_ALLOW_DENY_INTERFACE:
+
+                        if (t == XML_ATTRIBUTE_VALUE) {
+                                assert(i);
+                                if (i->interface) {
+                                        log_error("Duplicate interface at %s:%u.", path, line);
+                                        return -EINVAL;
+                                }
+
+                                i->interface = name;
+                                name = NULL;
+                                state = STATE_ALLOW_DENY;
+                        } else {
+                                log_error("Unexpected token (9) at %s:%u.", path, line);
+                                return -EINVAL;
+                        }
+
+                        break;
+
+                case STATE_ALLOW_DENY_MEMBER:
+
+                        if (t == XML_ATTRIBUTE_VALUE) {
+                                assert(i);
+                                if (i->member) {
+                                        log_error("Duplicate member in %s:%u.", path, line);
+                                        return -EINVAL;
+                                }
+
+                                i->member = name;
+                                name = NULL;
+                                state = STATE_ALLOW_DENY;
+                        } else {
+                                log_error("Unexpected token (10) in %s:%u.", path, line);
+                                return -EINVAL;
+                        }
+
+                        break;
+
+                case STATE_ALLOW_DENY_ERROR:
+
+                        if (t == XML_ATTRIBUTE_VALUE) {
+                                assert(i);
+                                if (i->error) {
+                                        log_error("Duplicate error in %s:%u.", path, line);
+                                        return -EINVAL;
+                                }
+
+                                i->error = name;
+                                name = NULL;
+                                state = STATE_ALLOW_DENY;
+                        } else {
+                                log_error("Unexpected token (11) in %s:%u.", path, line);
+                                return -EINVAL;
+                        }
+
+                        break;
+
+                case STATE_ALLOW_DENY_PATH:
+
+                        if (t == XML_ATTRIBUTE_VALUE) {
+                                assert(i);
+                                if (i->path) {
+                                        log_error("Duplicate path in %s:%u.", path, line);
+                                        return -EINVAL;
+                                }
+
+                                i->path = name;
+                                name = NULL;
+                                state = STATE_ALLOW_DENY;
+                        } else {
+                                log_error("Unexpected token (12) in %s:%u.", path, line);
+                                return -EINVAL;
+                        }
+
+                        break;
+
+                case STATE_ALLOW_DENY_MESSAGE_TYPE:
+
+                        if (t == XML_ATTRIBUTE_VALUE) {
+                                assert(i);
+
+                                if (i->message_type != 0) {
+                                        log_error("Duplicate message type in %s:%u.", path, line);
+                                        return -EINVAL;
+                                }
+
+                                r = bus_message_type_from_string(name, &i->message_type);
+                                if (r < 0) {
+                                        log_error("Invalid message type in %s:%u.", path, line);
+                                        return -EINVAL;
+                                }
+
+                                state = STATE_ALLOW_DENY;
+                        } else {
+                                log_error("Unexpected token (13) in %s:%u.", path, line);
+                                return -EINVAL;
+                        }
+
+                        break;
+
+                case STATE_ALLOW_DENY_NAME:
+
+                        if (t == XML_ATTRIBUTE_VALUE) {
+                                assert(i);
+                                if (i->name) {
+                                        log_error("Duplicate name in %s:%u.", path, line);
+                                        return -EINVAL;
+                                }
+
+                                switch (i->class) {
+                                case POLICY_ITEM_USER:
+                                        if (!streq(name, "*")) {
+                                                const char *u = name;
+
+                                                r = get_user_creds(&u, &i->uid, NULL, NULL, NULL);
+                                                if (r < 0)
+                                                        log_error_errno(r, "Failed to resolve user %s: %m", name);
+                                                else
+                                                        i->uid_valid = true;
+                                        }
+                                        break;
+                                case POLICY_ITEM_GROUP:
+                                        if (!streq(name, "*")) {
+                                                const char *g = name;
+
+                                                r = get_group_creds(&g, &i->gid);
+                                                if (r < 0)
+                                                        log_error_errno(r, "Failed to resolve group %s: %m", name);
+                                                else
+                                                        i->gid_valid = true;
+                                        }
+                                        break;
+                                default:
+                                        break;
+                                }
+
+                                i->name = name;
+                                name = NULL;
+
+                                state = STATE_ALLOW_DENY;
+                        } else {
+                                log_error("Unexpected token (14) in %s:%u.", path, line);
+                                return -EINVAL;
+                        }
+
+                        break;
+
+                case STATE_ALLOW_DENY_OTHER_ATTRIBUTE:
+
+                        if (t == XML_ATTRIBUTE_VALUE)
+                                state = STATE_ALLOW_DENY;
+                        else {
+                                log_error("Unexpected token (15) in %s:%u.", path, line);
+                                return -EINVAL;
+                        }
+
+                        break;
+
+                case STATE_OTHER:
+
+                        if (t == XML_TAG_OPEN)
+                                n_other++;
+                        else if (t == XML_TAG_CLOSE || t == XML_TAG_CLOSE_EMPTY) {
+
+                                if (n_other == 0)
+                                        state = STATE_BUSCONFIG;
+                                else
+                                        n_other--;
+                        }
+
+                        break;
+                }
+        }
+}
+
+enum {
+        DENY,
+        ALLOW,
+        DUNNO,
+};
+
+static const char *verdict_to_string(int v) {
+        switch (v) {
+
+        case DENY:
+                return "DENY";
+        case ALLOW:
+                return "ALLOW";
+        case DUNNO:
+                return "DUNNO";
+        }
+
+        return NULL;
+}
+
+struct policy_check_filter {
+        PolicyItemClass class;
+        uid_t uid;
+        gid_t gid;
+        int message_type;
+        const char *name;
+        const char *interface;
+        const char *path;
+        const char *member;
+};
+
+static int is_permissive(PolicyItem *i) {
+
+        assert(i);
+
+        return (i->type == POLICY_ITEM_ALLOW) ? ALLOW : DENY;
+}
+
+static int check_policy_item(PolicyItem *i, const struct policy_check_filter *filter) {
+
+        assert(i);
+        assert(filter);
+
+        switch (i->class) {
+        case POLICY_ITEM_SEND:
+        case POLICY_ITEM_RECV:
+
+                if (i->name && !streq_ptr(i->name, filter->name))
+                        break;
+
+                if ((i->message_type != 0) && (i->message_type != filter->message_type))
+                        break;
+
+                if (i->path && !streq_ptr(i->path, filter->path))
+                        break;
+
+                if (i->member && !streq_ptr(i->member, filter->member))
+                        break;
+
+                if (i->interface && !streq_ptr(i->interface, filter->interface))
+                        break;
+
+                return is_permissive(i);
+
+        case POLICY_ITEM_OWN:
+                assert(filter->name);
+
+                if (streq(i->name, "*") || streq(i->name, filter->name))
+                        return is_permissive(i);
+                break;
+
+        case POLICY_ITEM_OWN_PREFIX:
+                assert(filter->name);
+
+                if (streq(i->name, "*") || service_name_startswith(filter->name, i->name))
+                        return is_permissive(i);
+                break;
+
+        case POLICY_ITEM_USER:
+                if (filter->uid != UID_INVALID)
+                        if ((streq_ptr(i->name, "*") || (i->uid_valid && i->uid == filter->uid)))
+                                return is_permissive(i);
+                break;
+
+        case POLICY_ITEM_GROUP:
+                if (filter->gid != GID_INVALID)
+                        if ((streq_ptr(i->name, "*") || (i->gid_valid && i->gid == filter->gid)))
+                                return is_permissive(i);
+                break;
+
+        case POLICY_ITEM_IGNORE:
+        default:
+                break;
+        }
+
+        return DUNNO;
+}
+
+static int check_policy_items(PolicyItem *items, const struct policy_check_filter *filter) {
+
+        PolicyItem *i;
+        int verdict = DUNNO;
+
+        assert(filter);
+
+        /* Check all policies in a set - a broader one might be followed by a more specific one,
+         * and the order of rules in policy definitions matters */
+        LIST_FOREACH(items, i, items) {
+                int v;
+
+                if (i->class != filter->class &&
+                    !(i->class == POLICY_ITEM_OWN_PREFIX && filter->class == POLICY_ITEM_OWN))
+                        continue;
+
+                v = check_policy_item(i, filter);
+                if (v != DUNNO)
+                        verdict = v;
+        }
+
+        return verdict;
+}
+
+static int policy_check(Policy *p, const struct policy_check_filter *filter) {
+
+        PolicyItem *items;
+        int verdict, v;
+
+        assert(p);
+        assert(filter);
+
+        assert(IN_SET(filter->class, POLICY_ITEM_SEND, POLICY_ITEM_RECV, POLICY_ITEM_OWN, POLICY_ITEM_USER, POLICY_ITEM_GROUP));
+
+        /*
+         * The policy check is implemented by the following logic:
+         *
+         *  1. Check default items
+         *  2. Check group items
+         *  3. Check user items
+         *  4. Check mandatory items
+         *
+         *  Later rules override earlier rules.
+         */
+
+        verdict = check_policy_items(p->default_items, filter);
+
+        if (filter->gid != GID_INVALID) {
+                items = hashmap_get(p->group_items, UINT32_TO_PTR(filter->gid));
+                if (items) {
+                        v = check_policy_items(items, filter);
+                        if (v != DUNNO)
+                                verdict = v;
+                }
+        }
+
+        if (filter->uid != UID_INVALID) {
+                items = hashmap_get(p->user_items, UINT32_TO_PTR(filter->uid));
+                if (items) {
+                        v = check_policy_items(items, filter);
+                        if (v != DUNNO)
+                                verdict = v;
+                }
+        }
+
+        v = check_policy_items(p->mandatory_items, filter);
+        if (v != DUNNO)
+                verdict = v;
+
+        return verdict;
+}
+
+bool policy_check_own(Policy *p, uid_t uid, gid_t gid, const char *name) {
+
+        struct policy_check_filter filter = {
+                .class = POLICY_ITEM_OWN,
+                .uid   = uid,
+                .gid   = gid,
+                .name  = name,
+        };
+
+        int verdict;
+
+        assert(p);
+        assert(name);
+
+        verdict = policy_check(p, &filter);
+
+        log_full(LOG_AUTH | (verdict != ALLOW ? LOG_WARNING : LOG_DEBUG),
+                 "Ownership permission check for uid=" UID_FMT " gid=" GID_FMT" name=%s: %s",
+                 uid, gid, strna(name), strna(verdict_to_string(verdict)));
+
+        return verdict == ALLOW;
+}
+
+bool policy_check_hello(Policy *p, uid_t uid, gid_t gid) {
+
+        struct policy_check_filter filter = {
+                .uid = uid,
+                .gid = gid,
+        };
+        int verdict;
+
+        assert(p);
+
+        filter.class = POLICY_ITEM_USER;
+        verdict = policy_check(p, &filter);
+
+        if (verdict != DENY) {
+                int v;
+
+                filter.class = POLICY_ITEM_GROUP;
+                v = policy_check(p, &filter);
+                if (v != DUNNO)
+                        verdict = v;
+        }
+
+        log_full(LOG_AUTH | (verdict != ALLOW ? LOG_WARNING : LOG_DEBUG),
+                 "Hello permission check for uid=" UID_FMT " gid=" GID_FMT": %s",
+                 uid, gid, strna(verdict_to_string(verdict)));
+
+        return verdict == ALLOW;
+}
+
+bool policy_check_recv(Policy *p,
+                       uid_t uid,
+                       gid_t gid,
+                       int message_type,
+                       const char *name,
+                       const char *path,
+                       const char *interface,
+                       const char *member) {
+
+        struct policy_check_filter filter = {
+                .class        = POLICY_ITEM_RECV,
+                .uid          = uid,
+                .gid          = gid,
+                .message_type = message_type,
+                .name         = name,
+                .interface    = interface,
+                .path         = path,
+                .member       = member,
+        };
+
+        int verdict;
+
+        assert(p);
+
+        verdict = policy_check(p, &filter);
+
+        log_full(LOG_AUTH | (verdict != ALLOW ? LOG_WARNING : LOG_DEBUG),
+                 "Recieve permission check for uid=" UID_FMT " gid=" GID_FMT" message=%s name=%s interface=%s path=%s member=%s: %s",
+                 uid, gid, bus_message_type_to_string(message_type), strna(name), strna(path), strna(interface), strna(member), strna(verdict_to_string(verdict)));
+
+        return verdict == ALLOW;
+}
+
+bool policy_check_send(Policy *p,
+                       uid_t uid,
+                       gid_t gid,
+                       int message_type,
+                       const char *name,
+                       const char *path,
+                       const char *interface,
+                       const char *member) {
+
+        struct policy_check_filter filter = {
+                .class        = POLICY_ITEM_SEND,
+                .uid          = uid,
+                .gid          = gid,
+                .message_type = message_type,
+                .name         = name,
+                .interface    = interface,
+                .path         = path,
+                .member       = member,
+        };
+
+        int verdict;
+
+        assert(p);
+
+        verdict = policy_check(p, &filter);
+
+        log_full(LOG_AUTH | (verdict != ALLOW ? LOG_WARNING : LOG_DEBUG),
+                 "Send permission check for uid=" UID_FMT " gid=" GID_FMT" message=%s name=%s interface=%s path=%s member=%s: %s",
+                 uid, gid, bus_message_type_to_string(message_type), strna(name), strna(path), strna(interface), strna(member), strna(verdict_to_string(verdict)));
+
+        return verdict == ALLOW;
+}
+
+int policy_load(Policy *p, char **files) {
+        char **i;
+        int r;
+
+        assert(p);
+
+        STRV_FOREACH(i, files) {
+
+                r = file_load(p, *i);
+                if (r == -EISDIR) {
+                        _cleanup_strv_free_ char **l = NULL;
+                        char **j;
+
+                        r = conf_files_list(&l, ".conf", NULL, *i, NULL);
+                        if (r < 0)
+                                return log_error_errno(r, "Failed to get configuration file list: %m");
+
+                        STRV_FOREACH(j, l)
+                                file_load(p, *j);
+                }
+
+                /* We ignore all errors but EISDIR, and just proceed. */
+        }
+
+        return 0;
+}
+
+void policy_free(Policy *p) {
+        PolicyItem *i, *first;
+
+        if (!p)
+                return;
+
+        while ((i = p->default_items)) {
+                LIST_REMOVE(items, p->default_items, i);
+                policy_item_free(i);
+        }
+
+        while ((i = p->mandatory_items)) {
+                LIST_REMOVE(items, p->mandatory_items, i);
+                policy_item_free(i);
+        }
+
+        while ((first = hashmap_steal_first(p->user_items))) {
+
+                while ((i = first)) {
+                        LIST_REMOVE(items, first, i);
+                        policy_item_free(i);
+                }
+        }
+
+        while ((first = hashmap_steal_first(p->group_items))) {
+
+                while ((i = first)) {
+                        LIST_REMOVE(items, first, i);
+                        policy_item_free(i);
+                }
+        }
+
+        hashmap_free(p->user_items);
+        hashmap_free(p->group_items);
+
+        p->user_items = p->group_items = NULL;
+}
+
+static void dump_items(PolicyItem *items, const char *prefix) {
+
+        PolicyItem *i;
+
+        if (!items)
+                return;
+
+        if (!prefix)
+                prefix = "";
+
+        LIST_FOREACH(items, i, items) {
+
+                printf("%sType: %s\n"
+                       "%sClass: %s\n",
+                       prefix, policy_item_type_to_string(i->type),
+                       prefix, policy_item_class_to_string(i->class));
+
+                if (i->interface)
+                        printf("%sInterface: %s\n",
+                               prefix, i->interface);
+
+                if (i->member)
+                        printf("%sMember: %s\n",
+                               prefix, i->member);
+
+                if (i->error)
+                        printf("%sError: %s\n",
+                               prefix, i->error);
+
+                if (i->path)
+                        printf("%sPath: %s\n",
+                               prefix, i->path);
+
+                if (i->name)
+                        printf("%sName: %s\n",
+                               prefix, i->name);
+
+                if (i->message_type != 0)
+                        printf("%sMessage Type: %s\n",
+                               prefix, bus_message_type_to_string(i->message_type));
+
+                if (i->uid_valid) {
+                        _cleanup_free_ char *user;
+
+                        user = uid_to_name(i->uid);
+
+                        printf("%sUser: %s (%d)\n",
+                               prefix, strna(user), i->uid);
+                }
+
+                if (i->gid_valid) {
+                        _cleanup_free_ char *group;
+
+                        group = gid_to_name(i->gid);
+
+                        printf("%sGroup: %s (%d)\n",
+                               prefix, strna(group), i->gid);
+                }
+                printf("%s-\n", prefix);
+        }
+}
+
+static void dump_hashmap_items(Hashmap *h) {
+        PolicyItem *i;
+        Iterator j;
+        void *k;
+
+        HASHMAP_FOREACH_KEY(i, k, h, j) {
+                printf("\t%s Item for %u:\n", draw_special_char(DRAW_ARROW), PTR_TO_UINT(k));
+                dump_items(i, "\t\t");
+        }
+}
+
+void policy_dump(Policy *p) {
+
+        printf("%s Default Items:\n", draw_special_char(DRAW_ARROW));
+        dump_items(p->default_items, "\t");
+
+        printf("%s Group Items:\n", draw_special_char(DRAW_ARROW));
+        dump_hashmap_items(p->group_items);
+
+        printf("%s User Items:\n", draw_special_char(DRAW_ARROW));
+        dump_hashmap_items(p->user_items);
+
+        printf("%s Mandatory Items:\n", draw_special_char(DRAW_ARROW));
+        dump_items(p->mandatory_items, "\t");
+}
+
+static const char* const policy_item_type_table[_POLICY_ITEM_TYPE_MAX] = {
+        [_POLICY_ITEM_TYPE_UNSET] = "unset",
+        [POLICY_ITEM_ALLOW] = "allow",
+        [POLICY_ITEM_DENY] = "deny",
+};
+DEFINE_STRING_TABLE_LOOKUP(policy_item_type, PolicyItemType);
+
+static const char* const policy_item_class_table[_POLICY_ITEM_CLASS_MAX] = {
+        [_POLICY_ITEM_CLASS_UNSET] = "unset",
+        [POLICY_ITEM_SEND] = "send",
+        [POLICY_ITEM_RECV] = "recv",
+        [POLICY_ITEM_OWN] = "own",
+        [POLICY_ITEM_OWN_PREFIX] = "own-prefix",
+        [POLICY_ITEM_USER] = "user",
+        [POLICY_ITEM_GROUP] = "group",
+        [POLICY_ITEM_IGNORE] = "ignore",
+};
+DEFINE_STRING_TABLE_LOOKUP(policy_item_class, PolicyItemClass);