--- /dev/null
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include <sys/wait.h>
+
+#include "sd-daemon.h"
+
+#include "fd-util.h"
+#include "fs-util.h"
+#include "mkdir.h"
+#include "process-util.h"
+#include "set.h"
+#include "signal-util.h"
+#include "socket-util.h"
+#include "stdio-util.h"
+#include "umask-util.h"
+#include "userdbd-manager.h"
+
+#define LISTEN_TIMEOUT_USEC (25 * USEC_PER_SEC)
+
+static int start_workers(Manager *m, bool explicit_request);
+
+static int on_sigchld(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
+ Manager *m = userdata;
+
+ assert(s);
+ assert(m);
+
+ for (;;) {
+ siginfo_t siginfo = {};
+ bool removed = false;
+
+ if (waitid(P_ALL, 0, &siginfo, WNOHANG|WEXITED) < 0) {
+ if (errno == ECHILD)
+ break;
+
+ log_warning_errno(errno, "Failed to invoke waitid(): %m");
+ break;
+ }
+ if (siginfo.si_pid == 0)
+ break;
+
+ if (set_remove(m->workers_dynamic, PID_TO_PTR(siginfo.si_pid)))
+ removed = true;
+ if (set_remove(m->workers_fixed, PID_TO_PTR(siginfo.si_pid)))
+ removed = true;
+
+ if (!removed) {
+ log_warning("Weird, got SIGCHLD for unknown child " PID_FMT ", ignoring.", siginfo.si_pid);
+ continue;
+ }
+
+ if (siginfo.si_code == CLD_EXITED) {
+ if (siginfo.si_status == EXIT_SUCCESS)
+ log_debug("Worker " PID_FMT " exited successfully.", siginfo.si_pid);
+ else
+ log_warning("Worker " PID_FMT " died with a failure exit status %i, ignoring.", siginfo.si_pid, siginfo.si_status);
+ } else if (siginfo.si_code == CLD_KILLED)
+ log_warning("Worker " PID_FMT " was killed by signal %s, ignoring.", siginfo.si_pid, signal_to_string(siginfo.si_status));
+ else if (siginfo.si_code == CLD_DUMPED)
+ log_warning("Worker " PID_FMT " dumped core by signal %s, ignoring.", siginfo.si_pid, signal_to_string(siginfo.si_status));
+ else
+ log_warning("Can't handle SIGCHLD of this type");
+ }
+
+ (void) start_workers(m, false); /* Fill up workers again if we fell below the low watermark */
+ return 0;
+}
+
+static int on_sigusr2(sd_event_source *s, const struct signalfd_siginfo *si, void *userdata) {
+ Manager *m = userdata;
+
+ assert(s);
+ assert(m);
+
+ (void) start_workers(m, true); /* Workers told us there's more work, let's add one more worker as long as we are below the high watermark */
+ return 0;
+}
+
+int manager_new(Manager **ret) {
+ Manager *m;
+ int r;
+
+ m = new(Manager, 1);
+ if (!m)
+ return -ENOMEM;
+
+ *m = (Manager) {
+ .listen_fd = -1,
+ .worker_ratelimit = {
+ .interval = 5 * USEC_PER_SEC,
+ .burst = 50,
+ },
+ };
+
+ r = sd_event_new(&m->event);
+ if (r < 0)
+ return r;
+
+ r = sd_event_add_signal(m->event, NULL, SIGINT, NULL, NULL);
+ if (r < 0)
+ return r;
+
+ r = sd_event_add_signal(m->event, NULL, SIGTERM, NULL, NULL);
+ if (r < 0)
+ return r;
+
+ (void) sd_event_set_watchdog(m->event, true);
+
+ m->workers_fixed = set_new(NULL);
+ m->workers_dynamic = set_new(NULL);
+
+ if (!m->workers_fixed || !m->workers_dynamic)
+ return -ENOMEM;
+
+ r = sd_event_add_signal(m->event, &m->sigusr2_event_source, SIGUSR2, on_sigusr2, m);
+ if (r < 0)
+ return r;
+
+ r = sd_event_add_signal(m->event, &m->sigchld_event_source, SIGCHLD, on_sigchld, m);
+ if (r < 0)
+ return r;
+
+ *ret = TAKE_PTR(m);
+ return 0;
+}
+
+Manager* manager_free(Manager *m) {
+ if (!m)
+ return NULL;
+
+ set_free(m->workers_fixed);
+ set_free(m->workers_dynamic);
+
+ sd_event_source_disable_unref(m->sigusr2_event_source);
+ sd_event_source_disable_unref(m->sigchld_event_source);
+
+ sd_event_unref(m->event);
+
+ return mfree(m);
+}
+
+static size_t manager_current_workers(Manager *m) {
+ assert(m);
+
+ return set_size(m->workers_fixed) + set_size(m->workers_dynamic);
+}
+
+static int start_one_worker(Manager *m) {
+ bool fixed;
+ pid_t pid;
+ int r;
+
+ assert(m);
+
+ fixed = set_size(m->workers_fixed) < USERDB_WORKERS_MIN;
+
+ r = safe_fork("(sd-worker)", FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_LOG, &pid);
+ if (r < 0)
+ return log_error_errno(r, "Failed to fork new worker child: %m");
+ if (r == 0) {
+ char pids[DECIMAL_STR_MAX(pid_t)];
+ /* Child */
+
+ log_close();
+
+ r = close_all_fds(&m->listen_fd, 1);
+ if (r < 0) {
+ log_error_errno(r, "Failed to close fds in child: %m");
+ _exit(EXIT_FAILURE);
+ }
+
+ log_open();
+
+ if (m->listen_fd == 3) {
+ r = fd_cloexec(3, false);
+ if (r < 0) {
+ log_error_errno(r, "Failed to turn off O_CLOEXEC for fd 3: %m");
+ _exit(EXIT_FAILURE);
+ }
+ } else {
+ if (dup2(m->listen_fd, 3) < 0) { /* dup2() creates with O_CLOEXEC off */
+ log_error_errno(errno, "Failed to move listen fd to 3: %m");
+ _exit(EXIT_FAILURE);
+ }
+
+ safe_close(m->listen_fd);
+ }
+
+ xsprintf(pids, PID_FMT, pid);
+ if (setenv("LISTEN_PID", pids, 1) < 0) {
+ log_error_errno(errno, "Failed to set $LISTEN_PID: %m");
+ _exit(EXIT_FAILURE);
+ }
+
+ if (setenv("LISTEN_FDS", "1", 1) < 0) {
+ log_error_errno(errno, "Failed to set $LISTEN_FDS: %m");
+ _exit(EXIT_FAILURE);
+ }
+
+
+ if (setenv("USERDB_FIXED_WORKER", one_zero(fixed), 1) < 0) {
+ log_error_errno(errno, "Failed to set $USERDB_FIXED_WORKER: %m");
+ _exit(EXIT_FAILURE);
+ }
+
+ /* execl("/home/lennart/projects/systemd/build/systemd-userwork", "systemd-userwork", "xxxxxxxxxxxxxxxx", NULL); /\* With some extra space rename_process() can make use of *\/ */
+ /* execl("/usr/bin/valgrind", "valgrind", "/home/lennart/projects/systemd/build/systemd-userwork", "systemd-userwork", "xxxxxxxxxxxxxxxx", NULL); /\* With some extra space rename_process() can make use of *\/ */
+
+ execl(SYSTEMD_USERWORK_PATH, "systemd-userwork", "xxxxxxxxxxxxxxxx", NULL); /* With some extra space rename_process() can make use of */
+ log_error_errno(errno, "Failed start worker process: %m");
+ _exit(EXIT_FAILURE);
+ }
+
+ if (fixed)
+ r = set_put(m->workers_fixed, PID_TO_PTR(pid));
+ else
+ r = set_put(m->workers_dynamic, PID_TO_PTR(pid));
+ if (r < 0)
+ return log_error_errno(r, "Failed to add child process to set: %m");
+
+ return 0;
+}
+
+static int start_workers(Manager *m, bool explicit_request) {
+ int r;
+
+ assert(m);
+
+ for (;;) {
+ size_t n;
+
+ n = manager_current_workers(m);
+ if (n >= USERDB_WORKERS_MIN && (!explicit_request || n >= USERDB_WORKERS_MAX))
+ break;
+
+ if (!ratelimit_below(&m->worker_ratelimit)) {
+ /* If we keep starting workers too often, let's fail the whole daemon, something is wrong */
+ sd_event_exit(m->event, EXIT_FAILURE);
+
+ return log_error_errno(SYNTHETIC_ERRNO(EUCLEAN), "Worker threads requested too frequently, something is wrong.");
+ }
+
+ r = start_one_worker(m);
+ if (r < 0)
+ return r;
+
+ explicit_request = false;
+ }
+
+ return 0;
+}
+
+int manager_startup(Manager *m) {
+ struct timeval ts;
+ int n, r;
+
+ assert(m);
+ assert(m->listen_fd < 0);
+
+ n = sd_listen_fds(false);
+ if (n < 0)
+ return log_error_errno(n, "Failed to determine number of passed file descriptors: %m");
+ if (n > 1)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Expected one listening fd, got %i.", n);
+ if (n == 1)
+ m->listen_fd = SD_LISTEN_FDS_START;
+ else {
+ union sockaddr_union sockaddr;
+
+ r = sockaddr_un_set_path(&sockaddr.un, "/run/systemd/userdb/io.systemd.NameServiceSwitch");
+ if (r < 0)
+ return log_error_errno(r, "Cannot assign socket path to socket address: %m");
+
+ r = mkdir_p("/run/systemd/userdb", 0755);
+ if (r < 0)
+ return log_error_errno(r, "Failed to create /run/systemd/userdb: %m");
+
+ m->listen_fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0);
+ if (m->listen_fd < 0)
+ return log_error_errno(errno, "Failed to bind on socket: %m");
+
+ (void) sockaddr_un_unlink(&sockaddr.un);
+
+ RUN_WITH_UMASK(0000)
+ if (bind(m->listen_fd, &sockaddr.sa, SOCKADDR_UN_LEN(sockaddr.un)) < 0)
+ return log_error_errno(errno, "Failed to bind socket: %m");
+
+ r = symlink_idempotent("io.systemd.NameServiceSwitch", "/run/systemd/userdb/io.systemd.Multiplexer", false);
+ if (r < 0)
+ return log_error_errno(r, "Failed to bind io.systemd.Multiplexer: %m");
+
+ if (listen(m->listen_fd, SOMAXCONN) < 0)
+ return log_error_errno(errno, "Failed to listen on socket: %m");
+ }
+
+ /* Let's make sure every accept() call on this socket times out after 25s. This allows workers to be
+ * GC'ed on idle */
+ if (setsockopt(m->listen_fd, SOL_SOCKET, SO_RCVTIMEO, timeval_store(&ts, LISTEN_TIMEOUT_USEC), sizeof(ts)) < 0)
+ return log_error_errno(errno, "Failed to se SO_RCVTIMEO: %m");
+
+ return start_workers(m, false);
+}
--- /dev/null
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include <poll.h>
+#include <sys/wait.h>
+
+#include "sd-daemon.h"
+
+#include "env-util.h"
+#include "fd-util.h"
+#include "group-record-nss.h"
+#include "group-record.h"
+#include "main-func.h"
+#include "process-util.h"
+#include "strv.h"
+#include "time-util.h"
+#include "user-record-nss.h"
+#include "user-record.h"
+#include "user-util.h"
+#include "userdb.h"
+#include "varlink.h"
+
+#define ITERATIONS_MAX 64U
+#define RUNTIME_MAX_USEC (5 * USEC_PER_MINUTE)
+#define PRESSURE_SLEEP_TIME_USEC (50 * USEC_PER_MSEC)
+#define CONNECTION_IDLE_USEC (15 * USEC_PER_SEC)
+#define LISTEN_IDLE_USEC (90 * USEC_PER_SEC)
+
+typedef struct LookupParameters {
+ const char *user_name;
+ const char *group_name;
+ union {
+ uid_t uid;
+ gid_t gid;
+ };
+ const char *service;
+} LookupParameters;
+
+static int add_nss_service(JsonVariant **v) {
+ _cleanup_(json_variant_unrefp) JsonVariant *status = NULL, *z = NULL;
+ char buf[SD_ID128_STRING_MAX];
+ sd_id128_t mid;
+ int r;
+
+ assert(v);
+
+ /* Patch in service field if it's missing. The assumption here is that this field is unset only for
+ * NSS records */
+
+ if (json_variant_by_key(*v, "service"))
+ return 0;
+
+ r = sd_id128_get_machine(&mid);
+ if (r < 0)
+ return r;
+
+ status = json_variant_ref(json_variant_by_key(*v, "status"));
+ z = json_variant_ref(json_variant_by_key(status, sd_id128_to_string(mid, buf)));
+
+ if (json_variant_by_key(z, "service"))
+ return 0;
+
+ r = json_variant_set_field_string(&z, "service", "io.systemd.NameServiceSwitch");
+ if (r < 0)
+ return r;
+
+ r = json_variant_set_field(&status, buf, z);
+ if (r < 0)
+ return r;
+
+ return json_variant_set_field(v, "status", status);
+}
+
+static int build_user_json(Varlink *link, UserRecord *ur, JsonVariant **ret) {
+ _cleanup_(user_record_unrefp) UserRecord *stripped = NULL;
+ _cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
+ UserRecordLoadFlags flags;
+ uid_t peer_uid;
+ bool trusted;
+ int r;
+
+ assert(ur);
+ assert(ret);
+
+ r = varlink_get_peer_uid(link, &peer_uid);
+ if (r < 0) {
+ log_debug_errno(r, "Unable to query peer UID, ignoring: %m");
+ trusted = false;
+ } else
+ trusted = peer_uid == 0 || peer_uid == ur->uid;
+
+ flags = USER_RECORD_REQUIRE_REGULAR|USER_RECORD_ALLOW_PER_MACHINE|USER_RECORD_ALLOW_BINDING|USER_RECORD_STRIP_SECRET|USER_RECORD_ALLOW_STATUS|USER_RECORD_ALLOW_SIGNATURE;
+ if (trusted)
+ flags |= USER_RECORD_ALLOW_PRIVILEGED;
+ else
+ flags |= USER_RECORD_STRIP_PRIVILEGED;
+
+ r = user_record_clone(ur, flags, &stripped);
+ if (r < 0)
+ return r;
+
+ stripped->incomplete =
+ ur->incomplete ||
+ (FLAGS_SET(ur->mask, USER_RECORD_PRIVILEGED) &&
+ !FLAGS_SET(stripped->mask, USER_RECORD_PRIVILEGED));
+
+ v = json_variant_ref(stripped->json);
+ r = add_nss_service(&v);
+ if (r < 0)
+ return r;
+
+ return json_build(ret, JSON_BUILD_OBJECT(
+ JSON_BUILD_PAIR("record", JSON_BUILD_VARIANT(v)),
+ JSON_BUILD_PAIR("incomplete", JSON_BUILD_BOOLEAN(stripped->incomplete))));
+}
+
+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), 0 },
+ { "service", JSON_VARIANT_STRING, json_dispatch_const_string, offsetof(LookupParameters, service), 0 },
+ {}
+ };
+
+ _cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
+ _cleanup_(user_record_unrefp) UserRecord *hr = NULL;
+ LookupParameters p = {
+ .uid = UID_INVALID,
+ };
+ 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.NameServiceSwitch")) {
+ if (uid_is_valid(p.uid))
+ r = nss_user_record_by_uid(p.uid, &hr);
+ else if (p.user_name)
+ r = nss_user_record_by_name(p.user_name, &hr);
+ else {
+ _cleanup_(json_variant_unrefp) JsonVariant *last = NULL;
+
+ setpwent();
+
+ for (;;) {
+ _cleanup_(user_record_unrefp) UserRecord *z = NULL;
+ _cleanup_free_ char *sbuf = NULL;
+ struct passwd *pw;
+ struct spwd spwd;
+
+ errno = 0;
+ pw = getpwent();
+ if (!pw) {
+ if (errno != 0)
+ log_debug_errno(errno, "Failure while iterating through NSS user database, ignoring: %m");
+
+ break;
+ }
+
+ r = nss_spwd_for_passwd(pw, &spwd, &sbuf);
+ if (r < 0)
+ log_debug_errno(r, "Failed to acquire shadow entry for user %s, ignoring: %m", pw->pw_name);
+
+ r = nss_passwd_to_user_record(pw, NULL, &z);
+ if (r < 0) {
+ endpwent();
+ return r;
+ }
+
+ if (last) {
+ r = varlink_notify(link, last);
+ if (r < 0) {
+ endpwent();
+ return r;
+ }
+
+ last = json_variant_unref(last);
+ }
+
+ r = build_user_json(link, z, &last);
+ if (r < 0) {
+ endpwent();
+ return r;
+ }
+ }
+
+ endpwent();
+
+ if (!last)
+ return varlink_error(link, "io.systemd.UserDatabase.NoRecordFound", NULL);
+
+ return varlink_reply(link, last);
+ }
+
+ } else if (streq_ptr(p.service, "io.systemd.Multiplexer")) {
+
+ if (uid_is_valid(p.uid))
+ r = userdb_by_uid(p.uid, USERDB_AVOID_MULTIPLEXER, &hr);
+ else if (p.user_name)
+ r = userdb_by_name(p.user_name, USERDB_AVOID_MULTIPLEXER, &hr);
+ else {
+ _cleanup_(userdb_iterator_freep) UserDBIterator *iterator = NULL;
+ _cleanup_(json_variant_unrefp) JsonVariant *last = NULL;
+
+ r = userdb_all(USERDB_AVOID_MULTIPLEXER, &iterator);
+ if (r < 0)
+ return r;
+
+ for (;;) {
+ _cleanup_(user_record_unrefp) UserRecord *z = NULL;
+
+ r = userdb_iterator_get(iterator, &z);
+ if (r == -ESRCH)
+ break;
+ if (r < 0)
+ return r;
+
+ if (last) {
+ r = varlink_notify(link, last);
+ if (r < 0)
+ return r;
+
+ last = json_variant_unref(last);
+ }
+
+ r = build_user_json(link, z, &last);
+ if (r < 0)
+ return r;
+ }
+
+ if (!last)
+ return varlink_error(link, "io.systemd.UserDatabase.NoRecordFound", NULL);
+
+ return varlink_reply(link, last);
+ }
+ } else
+ return varlink_error(link, "io.systemd.UserDatabase.BadService", NULL);
+ if (r == -ESRCH)
+ return varlink_error(link, "io.systemd.UserDatabase.NoRecordFound", NULL);
+ if (r < 0) {
+ log_debug_errno(r, "User lookup failed abnormally: %m");
+ return varlink_error(link, "io.systemd.UserDatabase.ServiceNotAvailable", NULL);
+ }
+
+ if ((uid_is_valid(p.uid) && hr->uid != p.uid) ||
+ (p.user_name && !streq(hr->user_name, p.user_name)))
+ return varlink_error(link, "io.systemd.UserDatabase.ConflictingRecordFound", NULL);
+
+ r = build_user_json(link, hr, &v);
+ if (r < 0)
+ return r;
+
+ return varlink_reply(link, v);
+}
+
+static int build_group_json(Varlink *link, GroupRecord *gr, JsonVariant **ret) {
+ _cleanup_(group_record_unrefp) GroupRecord *stripped = NULL;
+ _cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
+ UserRecordLoadFlags flags;
+ uid_t peer_uid;
+ bool trusted;
+ int r;
+
+ assert(gr);
+ assert(ret);
+
+ r = varlink_get_peer_uid(link, &peer_uid);
+ if (r < 0) {
+ log_debug_errno(r, "Unable to query peer UID, ignoring: %m");
+ trusted = false;
+ } else
+ trusted = peer_uid == 0;
+
+ flags = USER_RECORD_REQUIRE_REGULAR|USER_RECORD_ALLOW_PER_MACHINE|USER_RECORD_ALLOW_BINDING|USER_RECORD_STRIP_SECRET|USER_RECORD_ALLOW_STATUS|USER_RECORD_ALLOW_SIGNATURE;
+ if (trusted)
+ flags |= USER_RECORD_ALLOW_PRIVILEGED;
+ else
+ flags |= USER_RECORD_STRIP_PRIVILEGED;
+
+ r = group_record_clone(gr, flags, &stripped);
+ if (r < 0)
+ return r;
+
+ stripped->incomplete =
+ gr->incomplete ||
+ (FLAGS_SET(gr->mask, USER_RECORD_PRIVILEGED) &&
+ !FLAGS_SET(stripped->mask, USER_RECORD_PRIVILEGED));
+
+ v = json_variant_ref(gr->json);
+ r = add_nss_service(&v);
+ if (r < 0)
+ return r;
+
+ return json_build(ret, JSON_BUILD_OBJECT(
+ JSON_BUILD_PAIR("record", JSON_BUILD_VARIANT(v)),
+ JSON_BUILD_PAIR("incomplete", JSON_BUILD_BOOLEAN(stripped->incomplete))));
+}
+
+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), 0 },
+ { "service", JSON_VARIANT_STRING, json_dispatch_const_string, offsetof(LookupParameters, service), 0 },
+ {}
+ };
+
+ _cleanup_(json_variant_unrefp) JsonVariant *v = NULL;
+ _cleanup_(group_record_unrefp) GroupRecord *g = NULL;
+ LookupParameters p = {
+ .gid = GID_INVALID,
+ };
+ 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.NameServiceSwitch")) {
+
+ if (gid_is_valid(p.gid))
+ r = nss_group_record_by_gid(p.gid, &g);
+ else if (p.group_name)
+ r = nss_group_record_by_name(p.group_name, &g);
+ else {
+ _cleanup_(json_variant_unrefp) JsonVariant *last = NULL;
+
+ setgrent();
+
+ for (;;) {
+ _cleanup_(group_record_unrefp) GroupRecord *z = NULL;
+ _cleanup_free_ char *sbuf = NULL;
+ struct group *grp;
+ struct sgrp sgrp;
+
+ errno = 0;
+ grp = getgrent();
+ if (!grp) {
+ if (errno != 0)
+ log_debug_errno(errno, "Failure while iterating through NSS group database, ignoring: %m");
+
+ break;
+ }
+
+ r = nss_sgrp_for_group(grp, &sgrp, &sbuf);
+ if (r < 0)
+ log_debug_errno(r, "Failed to acquire shadow entry for group %s, ignoring: %m", grp->gr_name);
+
+ r = nss_group_to_group_record(grp, r >= 0 ? &sgrp : NULL, &z);
+ if (r < 0) {
+ endgrent();
+ return r;
+ }
+
+ if (last) {
+ r = varlink_notify(link, last);
+ if (r < 0) {
+ endgrent();
+ return r;
+ }
+
+ last = json_variant_unref(last);
+ }
+
+ r = build_group_json(link, z, &last);
+ if (r < 0) {
+ endgrent();
+ return r;
+ }
+ }
+
+ endgrent();
+
+ if (!last)
+ return varlink_error(link, "io.systemd.UserDatabase.NoRecordFound", NULL);
+
+ return varlink_reply(link, last);
+ }
+
+ } else if (streq_ptr(p.service, "io.systemd.Multiplexer")) {
+
+ if (gid_is_valid(p.gid))
+ r = groupdb_by_gid(p.gid, USERDB_AVOID_MULTIPLEXER, &g);
+ else if (p.group_name)
+ r = groupdb_by_name(p.group_name, USERDB_AVOID_MULTIPLEXER, &g);
+ else {
+ _cleanup_(userdb_iterator_freep) UserDBIterator *iterator = NULL;
+ _cleanup_(json_variant_unrefp) JsonVariant *last = NULL;
+
+ r = groupdb_all(USERDB_AVOID_MULTIPLEXER, &iterator);
+ if (r < 0)
+ return r;
+
+ for (;;) {
+ _cleanup_(group_record_unrefp) GroupRecord *z = NULL;
+
+ r = groupdb_iterator_get(iterator, &z);
+ if (r == -ESRCH)
+ break;
+ if (r < 0)
+ return r;
+
+ if (last) {
+ r = varlink_notify(link, last);
+ if (r < 0)
+ return r;
+
+ last = json_variant_unref(last);
+ }
+
+ r = build_group_json(link, z, &last);
+ if (r < 0)
+ return r;
+ }
+
+ if (!last)
+ return varlink_error(link, "io.systemd.UserDatabase.NoRecordFound", NULL);
+
+ return varlink_reply(link, last);
+ }
+ } else
+ return varlink_error(link, "io.systemd.UserDatabase.BadService", NULL);
+ if (r == -ESRCH)
+ return varlink_error(link, "io.systemd.UserDatabase.NoRecordFound", NULL);
+ if (r < 0) {
+ log_debug_errno(r, "Group lookup failed abnormally: %m");
+ return varlink_error(link, "io.systemd.UserDatabase.ServiceNotAvailable", NULL);
+ }
+
+ if ((uid_is_valid(p.gid) && g->gid != p.gid) ||
+ (p.group_name && !streq(g->group_name, p.group_name)))
+ return varlink_error(link, "io.systemd.UserDatabase.ConflictingRecordFound", NULL);
+
+ r = build_group_json(link, g, &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), 0 },
+ { "groupName", JSON_VARIANT_STRING, json_dispatch_const_string, offsetof(LookupParameters, group_name), 0 },
+ { "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.NameServiceSwitch")) {
+
+ if (p.group_name) {
+ _cleanup_(group_record_unrefp) GroupRecord *g = NULL;
+ const char *last = NULL;
+ char **i;
+
+ r = nss_group_record_by_name(p.group_name, &g);
+ if (r == -ESRCH)
+ return varlink_error(link, "io.systemd.UserDatabase.NoRecordFound", NULL);
+ if (r < 0)
+ return r;
+
+ STRV_FOREACH(i, g->members) {
+
+ if (p.user_name && !streq_ptr(p.user_name, *i))
+ continue;
+
+ if (last) {
+ r = varlink_notifyb(link, JSON_BUILD_OBJECT(
+ JSON_BUILD_PAIR("userName", JSON_BUILD_STRING(last)),
+ JSON_BUILD_PAIR("groupName", JSON_BUILD_STRING(g->group_name))));
+ if (r < 0)
+ return r;
+ }
+
+ last = *i;
+ }
+
+ if (!last)
+ return varlink_error(link, "io.systemd.UserDatabase.NoRecordFound", NULL);
+
+ return varlink_replyb(link, JSON_BUILD_OBJECT(
+ JSON_BUILD_PAIR("userName", JSON_BUILD_STRING(last)),
+ JSON_BUILD_PAIR("groupName", JSON_BUILD_STRING(g->group_name))));
+ } else {
+ _cleanup_free_ char *last_user_name = NULL, *last_group_name = NULL;
+
+ setgrent();
+
+ for (;;) {
+ struct group *grp;
+ const char* two[2], **users, **i;
+
+ errno = 0;
+ grp = getgrent();
+ if (!grp) {
+ if (errno != 0)
+ log_debug_errno(errno, "Failure while iterating through NSS group database, ignoring: %m");
+
+ break;
+ }
+
+ if (p.user_name) {
+ if (!strv_contains(grp->gr_mem, p.user_name))
+ continue;
+
+ two[0] = p.user_name;
+ two[1] = NULL;
+
+ users = two;
+ } else
+ users = (const char**) grp->gr_mem;
+
+ STRV_FOREACH(i, users) {
+
+ if (last_user_name) {
+ assert(last_group_name);
+
+ r = varlink_notifyb(link, JSON_BUILD_OBJECT(
+ JSON_BUILD_PAIR("userName", JSON_BUILD_STRING(last_user_name)),
+ JSON_BUILD_PAIR("groupName", JSON_BUILD_STRING(last_group_name))));
+ if (r < 0) {
+ endgrent();
+ return r;
+ }
+
+ free(last_user_name);
+ free(last_group_name);
+ }
+
+ last_user_name = strdup(*i);
+ last_group_name = strdup(grp->gr_name);
+ if (!last_user_name || !last_group_name) {
+ endgrent();
+ return -ENOMEM;
+ }
+ }
+ }
+
+ endgrent();
+
+ if (!last_user_name) {
+ assert(!last_group_name);
+ return varlink_error(link, "io.systemd.UserDatabase.NoRecordFound", NULL);
+ }
+
+ assert(last_group_name);
+
+ return varlink_replyb(link, JSON_BUILD_OBJECT(
+ JSON_BUILD_PAIR("userName", JSON_BUILD_STRING(last_user_name)),
+ JSON_BUILD_PAIR("groupName", JSON_BUILD_STRING(last_group_name))));
+ }
+
+ } else if (streq_ptr(p.service, "io.systemd.Multiplexer")) {
+
+ _cleanup_free_ char *last_user_name = NULL, *last_group_name = NULL;
+ _cleanup_(userdb_iterator_freep) UserDBIterator *iterator = NULL;
+
+ if (p.group_name)
+ r = membershipdb_by_group(p.group_name, USERDB_AVOID_MULTIPLEXER, &iterator);
+ else if (p.user_name)
+ r = membershipdb_by_user(p.user_name, USERDB_AVOID_MULTIPLEXER, &iterator);
+ else
+ r = membershipdb_all(USERDB_AVOID_MULTIPLEXER, &iterator);
+ if (r < 0)
+ return r;
+
+ for (;;) {
+ _cleanup_free_ char *user_name = NULL, *group_name = NULL;
+
+ r = membershipdb_iterator_get(iterator, &user_name, &group_name);
+ if (r == -ESRCH)
+ break;
+ if (r < 0)
+ return r;
+
+ /* If both group + user are specified do a-posteriori filtering */
+ if (p.group_name && p.user_name && !streq(group_name, p.group_name))
+ continue;
+
+ if (last_user_name) {
+ assert(last_group_name);
+
+ r = varlink_notifyb(link, JSON_BUILD_OBJECT(
+ JSON_BUILD_PAIR("userName", JSON_BUILD_STRING(last_user_name)),
+ JSON_BUILD_PAIR("groupName", JSON_BUILD_STRING(last_group_name))));
+ if (r < 0)
+ return r;
+
+ free(last_user_name);
+ free(last_group_name);
+ }
+
+ last_user_name = TAKE_PTR(user_name);
+ last_group_name = TAKE_PTR(group_name);
+ }
+
+ if (!last_user_name) {
+ assert(!last_group_name);
+ return varlink_error(link, "io.systemd.UserDatabase.NoRecordFound", NULL);
+ }
+
+ assert(last_group_name);
+
+ return varlink_replyb(link, JSON_BUILD_OBJECT(
+ JSON_BUILD_PAIR("userName", JSON_BUILD_STRING(last_user_name)),
+ JSON_BUILD_PAIR("groupName", JSON_BUILD_STRING(last_group_name))));
+ }
+
+ return varlink_error(link, "io.systemd.UserDatabase.BadService", NULL);
+}
+
+static int process_connection(VarlinkServer *server, int fd) {
+ _cleanup_(varlink_close_unrefp) Varlink *vl = NULL;
+ int r;
+
+ r = varlink_server_add_connection(server, fd, &vl);
+ if (r < 0) {
+ fd = safe_close(fd);
+ return log_error_errno(r, "Failed to add connection: %m");
+ }
+
+ vl = varlink_ref(vl);
+
+ for (;;) {
+ r = varlink_process(vl);
+ if (r == -ENOTCONN) {
+ log_debug("Connection terminated.");
+ break;
+ }
+ if (r < 0)
+ return log_error_errno(r, "Failed to process connection: %m");
+ if (r > 0)
+ continue;
+
+ r = varlink_wait(vl, CONNECTION_IDLE_USEC);
+ if (r < 0)
+ return log_error_errno(r, "Failed to wait for connection events: %m");
+ if (r == 0)
+ break;
+ }
+
+ return 0;
+}
+
+static int run(int argc, char *argv[]) {
+ usec_t start_time, listen_idle_usec, last_busy_usec = USEC_INFINITY;
+ _cleanup_(varlink_server_unrefp) VarlinkServer *server = NULL;
+ _cleanup_close_ int lock = -1;
+ unsigned n_iterations = 0;
+ int m, listen_fd, r;
+
+ log_setup_service();
+
+ m = sd_listen_fds(false);
+ if (m < 0)
+ return log_error_errno(m, "Failed to determine number of listening fds: %m");
+ if (m == 0)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "No socket to listen on received.");
+ if (m > 1)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Worker can only listen on a single socket at a time.");
+
+ listen_fd = SD_LISTEN_FDS_START;
+
+ r = fd_nonblock(listen_fd, false);
+ if (r < 0)
+ return log_error_errno(r, "Failed to turn off non-blocking mode for listening socket: %m");
+
+ r = varlink_server_new(&server, 0);
+ if (r < 0)
+ return log_error_errno(r, "Failed to allocate server: %m");
+
+ r = varlink_server_bind_method_many(
+ server,
+ "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 bind methods: %m");
+
+ r = getenv_bool("USERDB_FIXED_WORKER");
+ if (r < 0)
+ return log_error_errno(r, "Failed to parse USERDB_FIXED_WORKER: %m");
+ listen_idle_usec = r ? USEC_INFINITY : LISTEN_IDLE_USEC;
+
+ lock = userdb_nss_compat_disable();
+ if (lock < 0)
+ return log_error_errno(r, "Failed to disable userdb NSS compatibility: %m");
+
+ start_time = now(CLOCK_MONOTONIC);
+
+ for (;;) {
+ _cleanup_close_ int fd = -1;
+ usec_t n;
+
+ /* Exit the worker in regular intervals, to flush out all memory use */
+ if (n_iterations++ > ITERATIONS_MAX) {
+ log_debug("Exiting worker, processed %u iterations, that's enough.", n_iterations);
+ break;
+ }
+
+ n = now(CLOCK_MONOTONIC);
+ if (n >= usec_add(start_time, RUNTIME_MAX_USEC)) {
+ char buf[FORMAT_TIMESPAN_MAX];
+ log_debug("Exiting worker, ran for %s, that's enough.", format_timespan(buf, sizeof(buf), usec_sub_unsigned(n, start_time), 0));
+ break;
+ }
+
+ if (last_busy_usec == USEC_INFINITY)
+ last_busy_usec = n;
+ else if (listen_idle_usec != USEC_INFINITY && n >= usec_add(last_busy_usec, listen_idle_usec)) {
+ char buf[FORMAT_TIMESPAN_MAX];
+ log_debug("Exiting worker, been idle for %s, .", format_timespan(buf, sizeof(buf), usec_sub_unsigned(n, last_busy_usec), 0));
+ break;
+ }
+
+ (void) rename_process("systemd-userwork: waiting...");
+
+ fd = accept4(listen_fd, NULL, NULL, SOCK_NONBLOCK|SOCK_CLOEXEC);
+ if (fd < 0)
+ fd = -errno;
+
+ (void) rename_process("systemd-userwork: processing...");
+
+ if (fd == -EAGAIN)
+ continue; /* The listening socket as SO_RECVTIMEO set, hence a time-out is expected
+ * after a while, let's check if it's time to exit though. */
+ if (fd == -EINTR)
+ continue; /* Might be that somebody attached via strace, let's just continue in that
+ * case */
+ if (fd < 0)
+ return log_error_errno(fd, "Failed to accept() from listening socket: %m");
+
+ if (now(CLOCK_MONOTONIC) <= usec_add(n, PRESSURE_SLEEP_TIME_USEC)) {
+ struct pollfd pfd = {
+ .fd = listen_fd,
+ .events = POLLIN,
+ };
+
+ /* We only slept a very short time? If so, let's see if there are more sockets
+ * pending, and if so, let's ask our parent for more workers */
+
+ if (poll(&pfd, 1, 0) < 0)
+ return log_error_errno(errno, "Failed to test for POLLIN on listening socket: %m");
+
+ if (FLAGS_SET(pfd.revents, POLLIN)) {
+ pid_t parent;
+
+ parent = getppid();
+ if (parent <= 1)
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Parent already died?");
+
+ if (kill(parent, SIGUSR1) < 0)
+ return log_error_errno(errno, "Failed to kill our own parent.");
+ }
+ }
+
+ (void) process_connection(server, TAKE_FD(fd));
+ last_busy_usec = USEC_INFINITY;
+ }
+
+ return 0;
+}
+
+DEFINE_MAIN_FUNCTION(run);
projects / thirdparty / systemd.git / commitdiff
