--- /dev/null
+/*-*- 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);
~ianmdlvl / elogind.git / blobdiff