}
}
-static bool is_matching_name_request(sd_bus_message *m, const char *name, bool prefix) {
-
- char *n = NULL;
- int r;
-
- if (!sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "RequestName"))
- return false;
-
- r = sd_bus_message_read(m, "s", &n);
- if (r < 0)
- return false;
-
- r = sd_bus_message_rewind(m, true);
- if (r < 0)
- return false;
-
- if (prefix)
- return startswith(name, n);
- else
- return streq_ptr(name, n);
-}
-
-static bool is_matching_call(PolicyItem *i, sd_bus_message *m, const char *name) {
-
- if (i->message_type && (i->message_type != m->header->type))
- return false;
-
- if (i->path && (!m->path || !streq(i->path, m->path)))
- return false;
-
- if (i->member && (!m->member || !streq(i->member, m->member)))
- return false;
-
- if (i->interface && (!m->interface || !streq(i->interface, m->interface)))
- return false;
-
- if (i->name && (!name || !streq(i->name, name)))
- return false;
-
- return true;
-}
-
enum {
ALLOW,
DUNNO,
DENY,
};
+struct policy_check_filter {
+ int class;
+ const struct ucred *ucred;
+ 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, sd_bus_message *m, const struct ucred *ucred) {
+static int check_policy_item(PolicyItem *i, const struct policy_check_filter *filter) {
+
+ assert(i);
+ assert(filter);
switch (i->class) {
case POLICY_ITEM_SEND:
- if ((m->bus->is_kernel && is_matching_call(i, m, m->destination)) ||
- (!m->bus->is_kernel && is_matching_call(i, m, m->sender)))
- return is_permissive(i);
- break;
-
case POLICY_ITEM_RECV:
- if ((m->bus->is_kernel && is_matching_call(i, m, m->sender)) ||
- (!m->bus->is_kernel && is_matching_call(i, m, m->destination)))
- return is_permissive(i);
- break;
+
+ if (i->name && !streq_ptr(i->name, filter->name))
+ break;
+
+ if ((i->message_type != _POLICY_ITEM_CLASS_UNSET) && (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:
- if (is_matching_name_request(m, i->name, false))
+ assert(filter->name);
+
+ if (streq(i->name, "*") || streq(i->name, filter->name))
return is_permissive(i);
break;
case POLICY_ITEM_OWN_PREFIX:
- if (is_matching_name_request(m, i->name, true))
+ assert(filter->name);
+
+ if (streq(i->name, "*") || startswith(i->name, filter->name))
return is_permissive(i);
break;
case POLICY_ITEM_USER:
- if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "Hello") &&
- (streq_ptr(i->name, "*") || (i->uid_valid && i->uid == ucred->uid)))
+ assert(filter->ucred);
+
+ if ((streq_ptr(i->name, "*") || (i->uid_valid && i->uid == filter->ucred->uid)))
return is_permissive(i);
break;
case POLICY_ITEM_GROUP:
- if (sd_bus_message_is_method_call(m, "org.freedesktop.DBus", "Hello") &&
- (streq_ptr(i->name, "*") || (i->gid_valid && i->gid == ucred->gid)))
+ assert(filter->ucred);
+
+ if ((streq_ptr(i->name, "*") || (i->gid_valid && i->gid == filter->ucred->gid)))
return is_permissive(i);
break;
return DUNNO;
}
-static int check_policy_items(PolicyItem *items, sd_bus_message *m, const struct ucred *ucred) {
+static int check_policy_items(PolicyItem *items, const struct policy_check_filter *filter) {
PolicyItem *i;
int r, ret = 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) {
- r = check_policy_item(i, m, ucred);
+ if (i->class != filter->class)
+ continue;
+
+ r = check_policy_item(i, filter);
if (r != DUNNO)
ret = r;
}
return ret;
}
-bool policy_check(Policy *p, sd_bus_message *m, const struct ucred *ucred) {
+static int policy_check(Policy *p, const struct policy_check_filter *filter) {
PolicyItem *items;
int r;
+ assert(p);
+ assert(filter);
+
/*
* The policy check is implemented by the following logic:
*
* 4. If the message isn't caught be the defaults either, reject it.
*/
- r = check_policy_items(p->mandatory_items, m, ucred);
+ r = check_policy_items(p->mandatory_items, filter);
if (r != DUNNO)
- return r == ALLOW;
+ return r;
- if (ucred->pid > 0) {
- items = hashmap_get(p->user_items, UINT32_TO_PTR(ucred->uid));
+ if (filter->ucred) {
+ items = hashmap_get(p->user_items, UINT32_TO_PTR(filter->ucred->uid));
if (items) {
- r = check_policy_items(items, m, ucred);
+ r = check_policy_items(items, filter);
if (r != DUNNO)
- return r == ALLOW;
+ return r;
}
- items = hashmap_get(p->group_items, UINT32_TO_PTR(ucred->gid));
+ items = hashmap_get(p->group_items, UINT32_TO_PTR(filter->ucred->gid));
if (items) {
- r = check_policy_items(items, m, ucred);
+ r = check_policy_items(items, filter);
if (r != DUNNO)
- return r == ALLOW;
+ return r;
}
}
- r = check_policy_items(p->default_items, m, ucred);
- if (r != DUNNO)
- return r == ALLOW;
+ return check_policy_items(p->default_items, filter);
+}
+
+bool policy_check_own(Policy *p, const struct ucred *ucred, const char *name) {
+
+ struct policy_check_filter filter = {
+ .class = POLICY_ITEM_OWN,
+ .ucred = ucred,
+ .name = name,
+ };
+
+ return policy_check(p, &filter) == ALLOW;
+}
+
+bool policy_check_hello(Policy *p, const struct ucred *ucred) {
+
+ struct policy_check_filter filter = {
+ .ucred = ucred,
+ };
+ int user, group;
+
+ filter.class = POLICY_ITEM_USER;
+ user = policy_check(p, &filter);
+ if (user == DENY)
+ return false;
+
+ filter.class = POLICY_ITEM_GROUP;
+ group = policy_check(p, &filter);
+ if (group == DENY)
+ return false;
+
+ return !(user == DUNNO && group == DUNNO);
+}
+
+bool policy_check_recv(Policy *p,
+ const struct ucred *ucred,
+ int message_type,
+ const char *name,
+ const char *path,
+ const char *interface,
+ const char *member) {
+
+ struct policy_check_filter filter = {
+ .class = POLICY_ITEM_RECV,
+ .ucred = ucred,
+ .message_type = message_type,
+ .name = name,
+ .interface = interface,
+ .path = path,
+ .member = member,
+ };
+
+ return policy_check(p, &filter) == ALLOW;
+}
- return false;
+bool policy_check_send(Policy *p,
+ const struct ucred *ucred,
+ int message_type,
+ const char *name,
+ const char *path,
+ const char *interface,
+ const char *member) {
+
+ struct policy_check_filter filter = {
+ .class = POLICY_ITEM_SEND,
+ .ucred = ucred,
+ .message_type = message_type,
+ .name = name,
+ .interface = interface,
+ .path = path,
+ .member = member,
+ };
+
+ return policy_check(p, &filter) == ALLOW;
}
int policy_load(Policy *p, char **files) {
~ianmdlvl / elogind.git / blobdiff