--- /dev/null
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include "format-util.h"
+#include "machined-varlink.h"
+#include "mkdir.h"
+#include "user-util.h"
+#include "varlink.h"
+
+typedef struct LookupParameters {
+ const char *user_name;
+ const char *group_name;
+ union {
+ uid_t uid;
+ gid_t gid;
+ };
+ const char *service;
+} LookupParameters;
+
+static int build_user_json(const char *user_name, uid_t uid, const char *real_name, JsonVariant **ret) {
+ assert(user_name);
+ assert(uid_is_valid(uid));
+ assert(ret);
+
+ return json_build(ret, JSON_BUILD_OBJECT(
+ JSON_BUILD_PAIR("record", JSON_BUILD_OBJECT(
+ JSON_BUILD_PAIR("userName", JSON_BUILD_STRING(user_name)),
+ JSON_BUILD_PAIR("uid", JSON_BUILD_UNSIGNED(uid)),
+ JSON_BUILD_PAIR("gid", JSON_BUILD_UNSIGNED(GID_NOBODY)),
+ JSON_BUILD_PAIR_CONDITION(!isempty(real_name), "realName", JSON_BUILD_STRING(real_name)),
+ JSON_BUILD_PAIR("homeDirectory", JSON_BUILD_STRING("/")),
+ JSON_BUILD_PAIR("shell", JSON_BUILD_STRING(NOLOGIN)),
+ JSON_BUILD_PAIR("locked", JSON_BUILD_BOOLEAN(true)),
+ JSON_BUILD_PAIR("service", JSON_BUILD_STRING("io.systemd.Machine")),
+ JSON_BUILD_PAIR("disposition", JSON_BUILD_STRING("container"))))));
+}
+
+static bool user_match_lookup_parameters(LookupParameters *p, const char *name, uid_t uid) {
+ assert(p);
+
+ if (p->user_name && !streq(name, p->user_name))
+ return false;
+
+ if (uid_is_valid(p->uid) && uid != p->uid)
+ return false;
+
+ return true;
+}
+
+static int user_lookup_uid(Manager *m, uid_t uid, char **ret_name, char **ret_real_name) {
+ _cleanup_free_ char *n = NULL, *rn = NULL;
+ uid_t converted_uid;
+ Machine *machine;
+ int r;
+
+ assert(m);
+ assert(uid_is_valid(uid));
+ assert(ret_name);
+ assert(ret_real_name);
+
+ if (uid < 0x10000) /* Host UID range */
+ return -ESRCH;
+
+ r = manager_find_machine_for_uid(m, uid, &machine, &converted_uid);
+ if (r < 0)
+ return r;
+ if (!r)
+ return -ESRCH;
+
+ if (asprintf(&n, "vu-%s-" UID_FMT, machine->name, converted_uid) < 0)
+ return -ENOMEM;
+
+ /* Don't synthesize invalid user/group names (too long...) */
+ if (!valid_user_group_name(n, 0))
+ return -ESRCH;
+
+ if (asprintf(&rn, "UID " UID_FMT " of Container %s", converted_uid, machine->name) < 0)
+ return -ENOMEM;
+
+ /* Don't synthesize invalid real names either, but since this field doesn't matter much, simply invalidate things */
+ if (!valid_gecos(rn))
+ rn = mfree(rn);
+
+ *ret_name = TAKE_PTR(n);
+ *ret_real_name = TAKE_PTR(rn);
+ return 0;
+}
+
+static int user_lookup_name(Manager *m, const char *name, uid_t *ret_uid, char **ret_real_name) {
+ _cleanup_free_ char *mn = NULL, *rn = NULL;
+ uid_t uid, converted_uid;
+ Machine *machine;
+ const char *e, *d;
+ int r;
+
+ assert(m);
+
+ if (!valid_user_group_name(name, 0))
+ return -ESRCH;
+
+ e = startswith(name, "vu-");
+ if (!e)
+ return -ESRCH;
+
+ d = strrchr(e, '-');
+ if (!d)
+ return -ESRCH;
+
+ if (parse_uid(d + 1, &uid) < 0)
+ return -ESRCH;
+
+ mn = strndup(e, d - e);
+ if (!mn)
+ return -ENOMEM;
+
+ machine = hashmap_get(m->machines, mn);
+ if (!machine)
+ return -ESRCH;
+
+ if (machine->class != MACHINE_CONTAINER)
+ return -ESRCH;
+
+ r = machine_translate_uid(machine, uid, &converted_uid);
+ if (r < 0)
+ return r;
+
+ if (asprintf(&rn, "UID " UID_FMT " of Container %s", uid, machine->name) < 0)
+ return -ENOMEM;
+ if (!valid_gecos(rn))
+ rn = mfree(rn);
+
+ *ret_uid = converted_uid;
+ *ret_real_name = TAKE_PTR(rn);
+ return 0;
+}
+
+static int vl_method_get_user_record(Varlink *link, JsonVariant *parameters, VarlinkMethodFlags flags, void *userdata) {
+
+ static const JsonDispatch dispatch_table[] = {
+ { "uid", JSON_VARIANT_UNSIGNED, json_dispatch_uid_gid, offsetof(LookupParameters, uid), 0 },
+ { "userName", JSON_VARIANT_STRING, json_dispatch_const_string, offsetof(LookupParameters, user_name), JSON_SAFE },
+ { "service", JSON_VARIANT_STRING, json_dispatch_const_string, offsetof(LookupParameters, service), 0 },
+ {}
+ };
+
+ _cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
+ LookupParameters p = {
+ .uid = UID_INVALID,
+ };
+ _cleanup_free_ char *found_name = NULL, *found_real_name = NULL;
+ uid_t found_uid = UID_INVALID, uid;
+ Manager *m = userdata;
+ const char *un;
+ int r;
+
+ assert(parameters);
+ assert(m);
+
+ r = json_dispatch(parameters, dispatch_table, NULL, 0, &p);
+ if (r < 0)
+ return r;
+
+ if (!streq_ptr(p.service, "io.systemd.Machine"))
+ return varlink_error(link, "io.systemd.UserDatabase.BadService", NULL);
+
+ if (uid_is_valid(p.uid))
+ r = user_lookup_uid(m, p.uid, &found_name, &found_real_name);
+ else if (p.user_name)
+ r = user_lookup_name(m, p.user_name, &found_uid, &found_real_name);
+ else
+ return varlink_error(link, "io.systemd.UserDatabase.EnumerationNotSupported", NULL);
+ if (r == -ESRCH)
+ return varlink_error(link, "io.systemd.UserDatabase.NoRecordFound", NULL);
+ if (r < 0)
+ return r;
+
+ uid = uid_is_valid(found_uid) ? found_uid : p.uid;
+ un = found_name ?: p.user_name;
+
+ if (!user_match_lookup_parameters(&p, un, uid))
+ return varlink_error(link, "io.systemd.UserDatabase.ConflictingRecordFound", NULL);
+
+ r = build_user_json(un, uid, found_real_name, &v);
+ if (r < 0)
+ return r;
+
+ return varlink_reply(link, v);
+}
+
+static int build_group_json(const char *group_name, gid_t gid, JsonVariant **ret) {
+ assert(group_name);
+ assert(gid_is_valid(gid));
+ assert(ret);
+
+ return json_build(ret, JSON_BUILD_OBJECT(
+ JSON_BUILD_PAIR("record", JSON_BUILD_OBJECT(
+ JSON_BUILD_PAIR("groupName", JSON_BUILD_STRING(group_name)),
+ JSON_BUILD_PAIR("gid", JSON_BUILD_UNSIGNED(gid)),
+ JSON_BUILD_PAIR("service", JSON_BUILD_STRING("io.systemd.Machine")),
+ JSON_BUILD_PAIR("disposition", JSON_BUILD_STRING("container"))))));
+ }
+
+static bool group_match_lookup_parameters(LookupParameters *p, const char *name, gid_t gid) {
+ assert(p);
+
+ if (p->group_name && !streq(name, p->group_name))
+ return false;
+
+ if (gid_is_valid(p->gid) && gid != p->gid)
+ return false;
+
+ return true;
+}
+
+static int group_lookup_gid(Manager *m, gid_t gid, char **ret_name) {
+ _cleanup_free_ char *n = NULL;
+ gid_t converted_gid;
+ Machine *machine;
+ int r;
+
+ assert(m);
+ assert(gid_is_valid(gid));
+ assert(ret_name);
+
+ if (gid < 0x10000) /* Host GID range */
+ return -ESRCH;
+
+ r = manager_find_machine_for_gid(m, gid, &machine, &converted_gid);
+ if (r < 0)
+ return r;
+ if (!r)
+ return -ESRCH;
+
+ if (asprintf(&n, "vg-%s-" GID_FMT, machine->name, converted_gid) < 0)
+ return -ENOMEM;
+
+ if (!valid_user_group_name(n, 0))
+ return -ESRCH;
+
+ *ret_name = TAKE_PTR(n);
+ return 0;
+}
+
+static int group_lookup_name(Manager *m, const char *name, gid_t *ret_gid) {
+ _cleanup_free_ char *mn = NULL;
+ gid_t gid, converted_gid;
+ Machine *machine;
+ const char *e, *d;
+ int r;
+
+ assert(m);
+
+ if (!valid_user_group_name(name, 0))
+ return -ESRCH;
+
+ e = startswith(name, "vg-");
+ if (!e)
+ return -ESRCH;
+
+ d = strrchr(e, '-');
+ if (!d)
+ return -ESRCH;
+
+ if (parse_gid(d + 1, &gid) < 0)
+ return -ESRCH;
+
+ mn = strndup(e, d - e);
+ if (!mn)
+ return -ENOMEM;
+
+ machine = hashmap_get(m->machines, mn);
+ if (!mn)
+ return -ESRCH;
+
+ if (machine->class != MACHINE_CONTAINER)
+ return -ESRCH;
+
+ r = machine_translate_gid(machine, gid, &converted_gid);
+ if (r < 0)
+ return r;
+
+ *ret_gid = converted_gid;
+ return 0;
+}
+
+static int vl_method_get_group_record(Varlink *link, JsonVariant *parameters, VarlinkMethodFlags flags, void *userdata) {
+
+ static const JsonDispatch dispatch_table[] = {
+ { "gid", JSON_VARIANT_UNSIGNED, json_dispatch_uid_gid, offsetof(LookupParameters, gid), 0 },
+ { "groupName", JSON_VARIANT_STRING, json_dispatch_const_string, offsetof(LookupParameters, group_name), JSON_SAFE },
+ { "service", JSON_VARIANT_STRING, json_dispatch_const_string, offsetof(LookupParameters, service), 0 },
+ {}
+ };
+
+ _cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
+ LookupParameters p = {
+ .gid = GID_INVALID,
+ };
+ _cleanup_free_ char *found_name = NULL;
+ uid_t found_gid = GID_INVALID, gid;
+ Manager *m = userdata;
+ const char *gn;
+ int r;
+
+ assert(parameters);
+ assert(m);
+
+ r = json_dispatch(parameters, dispatch_table, NULL, 0, &p);
+ if (r < 0)
+ return r;
+
+ if (!streq_ptr(p.service, "io.systemd.Machine"))
+ return varlink_error(link, "io.systemd.UserDatabase.BadService", NULL);
+
+ if (gid_is_valid(p.gid))
+ r = group_lookup_gid(m, p.gid, &found_name);
+ else if (p.group_name)
+ r = group_lookup_name(m, p.group_name, (uid_t*) &found_gid);
+ else
+ return varlink_error(link, "io.systemd.UserDatabase.EnumerationNotSupported", NULL);
+ if (r == -ESRCH)
+ return varlink_error(link, "io.systemd.UserDatabase.NoRecordFound", NULL);
+ if (r < 0)
+ return r;
+
+ gid = gid_is_valid(found_gid) ? found_gid : p.gid;
+ gn = found_name ?: p.group_name;
+
+ if (!group_match_lookup_parameters(&p, gn, gid))
+ return varlink_error(link, "io.systemd.UserDatabase.ConflictingRecordFound", NULL);
+
+ r = build_group_json(gn, gid, &v);
+ if (r < 0)
+ return r;
+
+ return varlink_reply(link, v);
+}
+
+static int vl_method_get_memberships(Varlink *link, JsonVariant *parameters, VarlinkMethodFlags flags, void *userdata) {
+
+ static const JsonDispatch dispatch_table[] = {
+ { "userName", JSON_VARIANT_STRING, json_dispatch_const_string, offsetof(LookupParameters, user_name), JSON_SAFE },
+ { "groupName", JSON_VARIANT_STRING, json_dispatch_const_string, offsetof(LookupParameters, group_name), JSON_SAFE },
+ { "service", JSON_VARIANT_STRING, json_dispatch_const_string, offsetof(LookupParameters, service), 0 },
+ {}
+ };
+
+ LookupParameters p = {};
+ int r;
+
+ assert(parameters);
+
+ r = json_dispatch(parameters, dispatch_table, NULL, 0, &p);
+ if (r < 0)
+ return r;
+
+ if (!streq_ptr(p.service, "io.systemd.Machine"))
+ return varlink_error(link, "io.systemd.UserDatabase.BadService", NULL);
+
+ /* We don't support auxiliary groups for machines. */
+ return varlink_error(link, "io.systemd.UserDatabase.NoRecordFound", NULL);
+}
+
+int manager_varlink_init(Manager *m) {
+ _cleanup_(varlink_server_unrefp) VarlinkServer *s = NULL;
+ int r;
+
+ assert(m);
+
+ if (m->varlink_server)
+ return 0;
+
+ r = varlink_server_new(&s, VARLINK_SERVER_ACCOUNT_UID);
+ if (r < 0)
+ return log_error_errno(r, "Failed to allocate varlink server object: %m");
+
+ varlink_server_set_userdata(s, m);
+
+ r = varlink_server_bind_method_many(
+ s,
+ "io.systemd.UserDatabase.GetUserRecord", vl_method_get_user_record,
+ "io.systemd.UserDatabase.GetGroupRecord", vl_method_get_group_record,
+ "io.systemd.UserDatabase.GetMemberships", vl_method_get_memberships);
+ if (r < 0)
+ return log_error_errno(r, "Failed to register varlink methods: %m");
+
+ (void) mkdir_p("/run/systemd/userdb", 0755);
+
+ r = varlink_server_listen_address(s, "/run/systemd/userdb/io.systemd.Machine", 0666);
+ if (r < 0)
+ return log_error_errno(r, "Failed to bind to varlink socket: %m");
+
+ r = varlink_server_attach_event(s, m->event, SD_EVENT_PRIORITY_NORMAL);
+ if (r < 0)
+ return log_error_errno(r, "Failed to attach varlink connection to event loop: %m");
+
+ m->varlink_server = TAKE_PTR(s);
+ return 0;
+}
+
+void manager_varlink_done(Manager *m) {
+ assert(m);
+
+ m->varlink_server = varlink_server_unref(m->varlink_server);
+}
projects / thirdparty / systemd.git / commitdiff
