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-rw-r--r--src/core/core-varlink.c310
-rw-r--r--src/core/core-varlink.h7
-rw-r--r--src/core/manager.c8
-rw-r--r--src/core/manager.h3
-rw-r--r--src/core/meson.build2
5 files changed, 329 insertions, 1 deletions
diff --git a/src/core/core-varlink.c b/src/core/core-varlink.c
new file mode 100644
index 0000000000..628b9ccaaa
--- /dev/null
+++ b/src/core/core-varlink.c
@@ -0,0 +1,310 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include "core-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, 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(uid)),
+ JSON_BUILD_PAIR("realName", JSON_BUILD_STRING("Dynamic User")),
+ 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.DynamicUser")),
+ JSON_BUILD_PAIR("disposition", JSON_BUILD_STRING("dynamic"))))));
+}
+
+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 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;
+ 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.DynamicUser"))
+ return varlink_error(link, "io.systemd.UserDatabase.BadService", NULL);
+
+ if (uid_is_valid(p.uid))
+ r = dynamic_user_lookup_uid(m, p.uid, &found_name);
+ else if (p.user_name)
+ r = dynamic_user_lookup_name(m, p.user_name, &found_uid);
+ else {
+ Iterator i;
+ DynamicUser *d;
+
+ HASHMAP_FOREACH(d, m->dynamic_users, i) {
+ r = dynamic_user_current(d, &uid);
+ if (r == -EAGAIN) /* not realized yet? */
+ continue;
+ if (r < 0)
+ return r;
+
+ if (!user_match_lookup_parameters(&p, d->name, uid))
+ continue;
+
+ if (v) {
+ r = varlink_notify(link, v);
+ if (r < 0)
+ return r;
+
+ v = json_variant_unref(v);
+ }
+
+ r = build_user_json(d->name, uid, &v);
+ if (r < 0)
+ return r;
+ }
+
+ if (!v)
+ return varlink_error(link, "io.systemd.UserDatabase.NoRecordFound", NULL);
+
+ return varlink_reply(link, v);
+ }
+ 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, &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.DynamicUser")),
+ JSON_BUILD_PAIR("disposition", JSON_BUILD_STRING("dynamic"))))));
+}
+
+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 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.DynamicUser"))
+ return varlink_error(link, "io.systemd.UserDatabase.BadService", NULL);
+
+ if (gid_is_valid(p.gid))
+ r = dynamic_user_lookup_uid(m, (uid_t) p.gid, &found_name);
+ else if (p.group_name)
+ r = dynamic_user_lookup_name(m, p.group_name, (uid_t*) &found_gid);
+ else {
+ DynamicUser *d;
+ Iterator i;
+
+ HASHMAP_FOREACH(d, m->dynamic_users, i) {
+ uid_t uid;
+
+ r = dynamic_user_current(d, &uid);
+ if (r == -EAGAIN)
+ continue;
+ if (r < 0)
+ return r;
+
+ if (!group_match_lookup_parameters(&p, d->name, (gid_t) uid))
+ continue;
+
+ if (v) {
+ r = varlink_notify(link, v);
+ if (r < 0)
+ return r;
+
+ v = json_variant_unref(v);
+ }
+
+ r = build_group_json(d->name, (gid_t) uid, &v);
+ if (r < 0)
+ return r;
+ }
+
+ if (!v)
+ return varlink_error(link, "io.systemd.UserDatabase.NoRecordFound", NULL);
+
+ return varlink_reply(link, v);
+ }
+ 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.DynamicUser"))
+ return varlink_error(link, "io.systemd.UserDatabase.BadService", NULL);
+
+ /* We don't support auxiliary groups with dynamic users. */
+ 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;
+
+ if (!MANAGER_IS_SYSTEM(m))
+ 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.DynamicUser", 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);
+}
diff --git a/src/core/core-varlink.h b/src/core/core-varlink.h
new file mode 100644
index 0000000000..89818e2766
--- /dev/null
+++ b/src/core/core-varlink.h
@@ -0,0 +1,7 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+#pragma once
+
+#include "manager.h"
+
+int manager_varlink_init(Manager *m);
+void manager_varlink_done(Manager *m);
diff --git a/src/core/manager.c b/src/core/manager.c
index dbd25af27e..cb0633e2ab 100644
--- a/src/core/manager.c
+++ b/src/core/manager.c
@@ -29,6 +29,7 @@
#include "bus-util.h"
#include "clean-ipc.h"
#include "clock-util.h"
+#include "core-varlink.h"
#include "dbus-job.h"
#include "dbus-manager.h"
#include "dbus-unit.h"
@@ -44,8 +45,8 @@
#include "fileio.h"
#include "fs-util.h"
#include "hashmap.h"
-#include "io-util.h"
#include "install.h"
+#include "io-util.h"
#include "label.h"
#include "locale-setup.h"
#include "log.h"
@@ -1346,6 +1347,7 @@ Manager* manager_free(Manager *m) {
lookup_paths_flush_generator(&m->lookup_paths);
bus_done(m);
+ manager_varlink_done(m);
exec_runtime_vacuum(m);
hashmap_free(m->exec_runtime_by_id);
@@ -1703,6 +1705,10 @@ int manager_startup(Manager *m, FILE *serialization, FDSet *fds) {
log_warning_errno(r, "Failed to deserialized tracked clients, ignoring: %m");
m->deserialized_subscribed = strv_free(m->deserialized_subscribed);
+ r = manager_varlink_init(m);
+ if (r < 0)
+ log_warning_errno(r, "Failed to set up Varlink server, ignoring: %m");
+
/* Third, fire things up! */
manager_coldplug(m);
diff --git a/src/core/manager.h b/src/core/manager.h
index 8ca8e3885f..67f9af5fc6 100644
--- a/src/core/manager.h
+++ b/src/core/manager.h
@@ -16,6 +16,7 @@
#include "list.h"
#include "prioq.h"
#include "ratelimit.h"
+#include "varlink.h"
struct libmnt_monitor;
typedef struct Unit Unit;
@@ -422,6 +423,8 @@ struct Manager {
unsigned notifygen;
bool honor_device_enumeration;
+
+ VarlinkServer *varlink_server;
};
static inline usec_t manager_default_timeout_abort_usec(Manager *m) {
diff --git a/src/core/meson.build b/src/core/meson.build
index e0f08c057e..3586838f59 100644
--- a/src/core/meson.build
+++ b/src/core/meson.build
@@ -22,6 +22,8 @@ libcore_sources = '''
bpf-firewall.h
cgroup.c
cgroup.h
+ core-varlink.c
+ core-varlink.h
dbus-automount.c
dbus-automount.h
dbus-cgroup.c
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