/* SPDX-License-Identifier: LGPL-2.1-or-later */ #include #include "conf-files.h" #include "dirent-util.h" #include "dlfcn-util.h" #include "errno-util.h" #include "fd-util.h" #include "format-util.h" #include "missing_syscall.h" #include "parse-util.h" #include "set.h" #include "socket-util.h" #include "strv.h" #include "user-record-nss.h" #include "user-util.h" #include "userdb-dropin.h" #include "userdb.h" #include "varlink.h" DEFINE_PRIVATE_HASH_OPS_WITH_VALUE_DESTRUCTOR(link_hash_ops, void, trivial_hash_func, trivial_compare_func, Varlink, varlink_unref); typedef enum LookupWhat { LOOKUP_USER, LOOKUP_GROUP, LOOKUP_MEMBERSHIP, _LOOKUP_WHAT_MAX, } LookupWhat; struct UserDBIterator { LookupWhat what; UserDBFlags flags; Set *links; bool nss_covered:1; bool nss_iterating:1; bool dropin_covered:1; bool synthesize_root:1; bool synthesize_nobody:1; bool nss_systemd_blocked:1; char **dropins; size_t current_dropin; int error; unsigned n_found; sd_event *event; UserRecord *found_user; /* when .what == LOOKUP_USER */ GroupRecord *found_group; /* when .what == LOOKUP_GROUP */ char *found_user_name, *found_group_name; /* when .what == LOOKUP_MEMBERSHIP */ char **members_of_group; size_t index_members_of_group; char *filter_user_name, *filter_group_name; }; UserDBIterator* userdb_iterator_free(UserDBIterator *iterator) { if (!iterator) return NULL; set_free(iterator->links); strv_free(iterator->dropins); switch (iterator->what) { case LOOKUP_USER: user_record_unref(iterator->found_user); if (iterator->nss_iterating) endpwent(); break; case LOOKUP_GROUP: group_record_unref(iterator->found_group); if (iterator->nss_iterating) endgrent(); break; case LOOKUP_MEMBERSHIP: free(iterator->found_user_name); free(iterator->found_group_name); strv_free(iterator->members_of_group); free(iterator->filter_user_name); free(iterator->filter_group_name); if (iterator->nss_iterating) endgrent(); break; default: assert_not_reached(); } sd_event_unref(iterator->event); if (iterator->nss_systemd_blocked) assert_se(userdb_block_nss_systemd(false) >= 0); return mfree(iterator); } static UserDBIterator* userdb_iterator_new(LookupWhat what, UserDBFlags flags) { UserDBIterator *i; assert(what >= 0); assert(what < _LOOKUP_WHAT_MAX); i = new(UserDBIterator, 1); if (!i) return NULL; *i = (UserDBIterator) { .what = what, .flags = flags, .synthesize_root = !FLAGS_SET(flags, USERDB_DONT_SYNTHESIZE), .synthesize_nobody = !FLAGS_SET(flags, USERDB_DONT_SYNTHESIZE), }; return i; } static int userdb_iterator_block_nss_systemd(UserDBIterator *iterator) { int r; assert(iterator); if (iterator->nss_systemd_blocked) return 0; r = userdb_block_nss_systemd(true); if (r < 0) return r; iterator->nss_systemd_blocked = true; return 1; } struct user_group_data { JsonVariant *record; bool incomplete; }; static void user_group_data_done(struct user_group_data *d) { json_variant_unref(d->record); } struct membership_data { char *user_name; char *group_name; }; static void membership_data_done(struct membership_data *d) { free(d->user_name); free(d->group_name); } static int userdb_on_query_reply( Varlink *link, JsonVariant *parameters, const char *error_id, VarlinkReplyFlags flags, void *userdata) { UserDBIterator *iterator = ASSERT_PTR(userdata); int r; if (error_id) { log_debug("Got lookup error: %s", error_id); if (STR_IN_SET(error_id, "io.systemd.UserDatabase.NoRecordFound", "io.systemd.UserDatabase.ConflictingRecordFound")) r = -ESRCH; else if (streq(error_id, "io.systemd.UserDatabase.ServiceNotAvailable")) r = -EHOSTDOWN; else if (streq(error_id, "io.systemd.UserDatabase.EnumerationNotSupported")) r = -EOPNOTSUPP; else if (streq(error_id, VARLINK_ERROR_TIMEOUT)) r = -ETIMEDOUT; else r = -EIO; goto finish; } switch (iterator->what) { case LOOKUP_USER: { _cleanup_(user_group_data_done) struct user_group_data user_data = {}; static const JsonDispatch dispatch_table[] = { { "record", _JSON_VARIANT_TYPE_INVALID, json_dispatch_variant, offsetof(struct user_group_data, record), 0 }, { "incomplete", JSON_VARIANT_BOOLEAN, json_dispatch_boolean, offsetof(struct user_group_data, incomplete), 0 }, {} }; _cleanup_(user_record_unrefp) UserRecord *hr = NULL; assert_se(!iterator->found_user); r = json_dispatch(parameters, dispatch_table, JSON_ALLOW_EXTENSIONS, &user_data); if (r < 0) goto finish; if (!user_data.record) { r = log_debug_errno(SYNTHETIC_ERRNO(EIO), "Reply is missing record key"); goto finish; } hr = user_record_new(); if (!hr) { r = -ENOMEM; goto finish; } r = user_record_load(hr, user_data.record, USER_RECORD_LOAD_REFUSE_SECRET|USER_RECORD_PERMISSIVE); if (r < 0) goto finish; if (!hr->service) { r = log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "User record does not carry service information, refusing."); goto finish; } hr->incomplete = user_data.incomplete; /* We match the root user by the name since the name is our primary key. We match the nobody * use by UID though, since the name might differ on OSes */ if (streq_ptr(hr->user_name, "root")) iterator->synthesize_root = false; if (hr->uid == UID_NOBODY) iterator->synthesize_nobody = false; iterator->found_user = TAKE_PTR(hr); iterator->n_found++; /* More stuff coming? then let's just exit cleanly here */ if (FLAGS_SET(flags, VARLINK_REPLY_CONTINUES)) return 0; /* Otherwise, let's remove this link and exit cleanly then */ r = 0; goto finish; } case LOOKUP_GROUP: { _cleanup_(user_group_data_done) struct user_group_data group_data = {}; static const JsonDispatch dispatch_table[] = { { "record", _JSON_VARIANT_TYPE_INVALID, json_dispatch_variant, offsetof(struct user_group_data, record), 0 }, { "incomplete", JSON_VARIANT_BOOLEAN, json_dispatch_boolean, offsetof(struct user_group_data, incomplete), 0 }, {} }; _cleanup_(group_record_unrefp) GroupRecord *g = NULL; assert_se(!iterator->found_group); r = json_dispatch(parameters, dispatch_table, JSON_ALLOW_EXTENSIONS, &group_data); if (r < 0) goto finish; if (!group_data.record) { r = log_debug_errno(SYNTHETIC_ERRNO(EIO), "Reply is missing record key"); goto finish; } g = group_record_new(); if (!g) { r = -ENOMEM; goto finish; } r = group_record_load(g, group_data.record, USER_RECORD_LOAD_REFUSE_SECRET|USER_RECORD_PERMISSIVE); if (r < 0) goto finish; if (!g->service) { r = log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "Group record does not carry service information, refusing."); goto finish; } g->incomplete = group_data.incomplete; if (streq_ptr(g->group_name, "root")) iterator->synthesize_root = false; if (g->gid == GID_NOBODY) iterator->synthesize_nobody = false; iterator->found_group = TAKE_PTR(g); iterator->n_found++; if (FLAGS_SET(flags, VARLINK_REPLY_CONTINUES)) return 0; r = 0; goto finish; } case LOOKUP_MEMBERSHIP: { _cleanup_(membership_data_done) struct membership_data membership_data = {}; static const JsonDispatch dispatch_table[] = { { "userName", JSON_VARIANT_STRING, json_dispatch_user_group_name, offsetof(struct membership_data, user_name), JSON_RELAX }, { "groupName", JSON_VARIANT_STRING, json_dispatch_user_group_name, offsetof(struct membership_data, group_name), JSON_RELAX }, {} }; assert(!iterator->found_user_name); assert(!iterator->found_group_name); r = json_dispatch(parameters, dispatch_table, JSON_ALLOW_EXTENSIONS, &membership_data); if (r < 0) goto finish; iterator->found_user_name = TAKE_PTR(membership_data.user_name); iterator->found_group_name = TAKE_PTR(membership_data.group_name); iterator->n_found++; if (FLAGS_SET(flags, VARLINK_REPLY_CONTINUES)) return 0; r = 0; goto finish; } default: assert_not_reached(); } finish: /* If we got one ESRCH, let that win. This way when we do a wild dump we won't be tripped up by bad * errors if at least one connection ended cleanly */ if (r == -ESRCH || iterator->error == 0) iterator->error = -r; assert_se(set_remove(iterator->links, link) == link); link = varlink_unref(link); return 0; } static int userdb_connect( UserDBIterator *iterator, const char *path, const char *method, bool more, JsonVariant *query) { _cleanup_(varlink_unrefp) Varlink *vl = NULL; int r; assert(iterator); assert(path); assert(method); r = varlink_connect_address(&vl, path); if (r < 0) return log_debug_errno(r, "Unable to connect to %s: %m", path); varlink_set_userdata(vl, iterator); if (!iterator->event) { r = sd_event_new(&iterator->event); if (r < 0) return log_debug_errno(r, "Unable to allocate event loop: %m"); } r = varlink_attach_event(vl, iterator->event, SD_EVENT_PRIORITY_NORMAL); if (r < 0) return log_debug_errno(r, "Failed to attach varlink connection to event loop: %m"); (void) varlink_set_description(vl, path); r = varlink_bind_reply(vl, userdb_on_query_reply); if (r < 0) return log_debug_errno(r, "Failed to bind reply callback: %m"); if (more) r = varlink_observe(vl, method, query); else r = varlink_invoke(vl, method, query); if (r < 0) return log_debug_errno(r, "Failed to invoke varlink method: %m"); r = set_ensure_consume(&iterator->links, &link_hash_ops, TAKE_PTR(vl)); if (r < 0) return log_debug_errno(r, "Failed to add varlink connection to set: %m"); return r; } static int userdb_start_query( UserDBIterator *iterator, const char *method, bool more, JsonVariant *query, UserDBFlags flags) { _cleanup_strv_free_ char **except = NULL, **only = NULL; _cleanup_closedir_ DIR *d = NULL; const char *e; int r, ret = 0; assert(iterator); assert(method); if (FLAGS_SET(flags, USERDB_EXCLUDE_VARLINK)) return -ENOLINK; e = getenv("SYSTEMD_BYPASS_USERDB"); if (e) { r = parse_boolean(e); if (r > 0) return -ENOLINK; if (r < 0) { except = strv_split(e, ":"); if (!except) return -ENOMEM; } } e = getenv("SYSTEMD_ONLY_USERDB"); if (e) { only = strv_split(e, ":"); if (!only) return -ENOMEM; } /* First, let's talk to the multiplexer, if we can */ if ((flags & (USERDB_AVOID_MULTIPLEXER|USERDB_EXCLUDE_DYNAMIC_USER|USERDB_EXCLUDE_NSS|USERDB_EXCLUDE_DROPIN|USERDB_DONT_SYNTHESIZE)) == 0 && !strv_contains(except, "io.systemd.Multiplexer") && (!only || strv_contains(only, "io.systemd.Multiplexer"))) { _cleanup_(json_variant_unrefp) JsonVariant *patched_query = json_variant_ref(query); r = json_variant_set_field_string(&patched_query, "service", "io.systemd.Multiplexer"); if (r < 0) return log_debug_errno(r, "Unable to set service JSON field: %m"); r = userdb_connect(iterator, "/run/systemd/userdb/io.systemd.Multiplexer", method, more, patched_query); if (r >= 0) { iterator->nss_covered = true; /* The multiplexer does NSS */ iterator->dropin_covered = true; /* It also handles drop-in stuff */ return 0; } } d = opendir("/run/systemd/userdb/"); if (!d) { if (errno == ENOENT) return -ESRCH; return -errno; } FOREACH_DIRENT(de, d, return -errno) { _cleanup_(json_variant_unrefp) JsonVariant *patched_query = NULL; _cleanup_free_ char *p = NULL; bool is_nss, is_dropin; if (streq(de->d_name, "io.systemd.Multiplexer")) /* We already tried this above, don't try this again */ continue; if (FLAGS_SET(flags, USERDB_EXCLUDE_DYNAMIC_USER) && streq(de->d_name, "io.systemd.DynamicUser")) continue; /* Avoid NSS if this is requested. Note that we also skip NSS when we were asked to skip the * multiplexer, since in that case it's safer to do NSS in the client side emulation below * (and when we run as part of systemd-userdbd.service we don't want to talk to ourselves * anyway). */ is_nss = streq(de->d_name, "io.systemd.NameServiceSwitch"); if ((flags & (USERDB_EXCLUDE_NSS|USERDB_AVOID_MULTIPLEXER)) && is_nss) continue; /* Similar for the drop-in service */ is_dropin = streq(de->d_name, "io.systemd.DropIn"); if ((flags & (USERDB_EXCLUDE_DROPIN|USERDB_AVOID_MULTIPLEXER)) && is_dropin) continue; if (strv_contains(except, de->d_name)) continue; if (only && !strv_contains(only, de->d_name)) continue; p = path_join("/run/systemd/userdb/", de->d_name); if (!p) return -ENOMEM; patched_query = json_variant_ref(query); r = json_variant_set_field_string(&patched_query, "service", de->d_name); if (r < 0) return log_debug_errno(r, "Unable to set service JSON field: %m"); r = userdb_connect(iterator, p, method, more, patched_query); if (is_nss && r >= 0) /* Turn off fallback NSS + dropin if we found the NSS/dropin service * and could connect to it */ iterator->nss_covered = true; if (is_dropin && r >= 0) iterator->dropin_covered = true; if (ret == 0 && r < 0) ret = r; } if (set_isempty(iterator->links)) return ret < 0 ? ret : -ESRCH; /* propagate last error we saw if we couldn't connect to anything. */ /* We connected to some services, in this case, ignore the ones we failed on */ return 0; } static int userdb_process( UserDBIterator *iterator, UserRecord **ret_user_record, GroupRecord **ret_group_record, char **ret_user_name, char **ret_group_name) { int r; assert(iterator); for (;;) { if (iterator->what == LOOKUP_USER && iterator->found_user) { if (ret_user_record) *ret_user_record = TAKE_PTR(iterator->found_user); else iterator->found_user = user_record_unref(iterator->found_user); if (ret_group_record) *ret_group_record = NULL; if (ret_user_name) *ret_user_name = NULL; if (ret_group_name) *ret_group_name = NULL; return 0; } if (iterator->what == LOOKUP_GROUP && iterator->found_group) { if (ret_group_record) *ret_group_record = TAKE_PTR(iterator->found_group); else iterator->found_group = group_record_unref(iterator->found_group); if (ret_user_record) *ret_user_record = NULL; if (ret_user_name) *ret_user_name = NULL; if (ret_group_name) *ret_group_name = NULL; return 0; } if (iterator->what == LOOKUP_MEMBERSHIP && iterator->found_user_name && iterator->found_group_name) { if (ret_user_name) *ret_user_name = TAKE_PTR(iterator->found_user_name); else iterator->found_user_name = mfree(iterator->found_user_name); if (ret_group_name) *ret_group_name = TAKE_PTR(iterator->found_group_name); else iterator->found_group_name = mfree(iterator->found_group_name); if (ret_user_record) *ret_user_record = NULL; if (ret_group_record) *ret_group_record = NULL; return 0; } if (set_isempty(iterator->links)) { if (iterator->error == 0) return -ESRCH; return -abs(iterator->error); } if (!iterator->event) return -ESRCH; r = sd_event_run(iterator->event, UINT64_MAX); if (r < 0) return r; } } static int synthetic_root_user_build(UserRecord **ret) { return user_record_build( ret, JSON_BUILD_OBJECT(JSON_BUILD_PAIR("userName", JSON_BUILD_CONST_STRING("root")), JSON_BUILD_PAIR("uid", JSON_BUILD_UNSIGNED(0)), JSON_BUILD_PAIR("gid", JSON_BUILD_UNSIGNED(0)), JSON_BUILD_PAIR("homeDirectory", JSON_BUILD_CONST_STRING("/root")), JSON_BUILD_PAIR("disposition", JSON_BUILD_CONST_STRING("intrinsic")))); } static int synthetic_nobody_user_build(UserRecord **ret) { return user_record_build( ret, JSON_BUILD_OBJECT(JSON_BUILD_PAIR("userName", JSON_BUILD_CONST_STRING(NOBODY_USER_NAME)), JSON_BUILD_PAIR("uid", JSON_BUILD_UNSIGNED(UID_NOBODY)), JSON_BUILD_PAIR("gid", JSON_BUILD_UNSIGNED(GID_NOBODY)), JSON_BUILD_PAIR("shell", JSON_BUILD_CONST_STRING(NOLOGIN)), JSON_BUILD_PAIR("locked", JSON_BUILD_BOOLEAN(true)), JSON_BUILD_PAIR("disposition", JSON_BUILD_CONST_STRING("intrinsic")))); } int userdb_by_name(const char *name, UserDBFlags flags, UserRecord **ret) { _cleanup_(userdb_iterator_freep) UserDBIterator *iterator = NULL; _cleanup_(json_variant_unrefp) JsonVariant *query = NULL; int r; if (!valid_user_group_name(name, VALID_USER_RELAX)) return -EINVAL; r = json_build(&query, JSON_BUILD_OBJECT( JSON_BUILD_PAIR("userName", JSON_BUILD_STRING(name)))); if (r < 0) return r; iterator = userdb_iterator_new(LOOKUP_USER, flags); if (!iterator) return -ENOMEM; r = userdb_start_query(iterator, "io.systemd.UserDatabase.GetUserRecord", false, query, flags); if (r >= 0) { r = userdb_process(iterator, ret, NULL, NULL, NULL); if (r >= 0) return r; } if (!FLAGS_SET(flags, USERDB_EXCLUDE_DROPIN) && !iterator->dropin_covered) { r = dropin_user_record_by_name(name, NULL, flags, ret); if (r >= 0) return r; } if (!FLAGS_SET(flags, USERDB_EXCLUDE_NSS) && !iterator->nss_covered) { /* Make sure the NSS lookup doesn't recurse back to us. */ r = userdb_iterator_block_nss_systemd(iterator); if (r >= 0) { /* Client-side NSS fallback */ r = nss_user_record_by_name(name, !FLAGS_SET(flags, USERDB_SUPPRESS_SHADOW), ret); if (r >= 0) return r; } } if (!FLAGS_SET(flags, USERDB_DONT_SYNTHESIZE)) { if (streq(name, "root")) return synthetic_root_user_build(ret); if (streq(name, NOBODY_USER_NAME) && synthesize_nobody()) return synthetic_nobody_user_build(ret); } return r; } int userdb_by_uid(uid_t uid, UserDBFlags flags, UserRecord **ret) { _cleanup_(userdb_iterator_freep) UserDBIterator *iterator = NULL; _cleanup_(json_variant_unrefp) JsonVariant *query = NULL; int r; if (!uid_is_valid(uid)) return -EINVAL; r = json_build(&query, JSON_BUILD_OBJECT( JSON_BUILD_PAIR("uid", JSON_BUILD_UNSIGNED(uid)))); if (r < 0) return r; iterator = userdb_iterator_new(LOOKUP_USER, flags); if (!iterator) return -ENOMEM; r = userdb_start_query(iterator, "io.systemd.UserDatabase.GetUserRecord", false, query, flags); if (r >= 0) { r = userdb_process(iterator, ret, NULL, NULL, NULL); if (r >= 0) return r; } if (!FLAGS_SET(flags, USERDB_EXCLUDE_DROPIN) && !iterator->dropin_covered) { r = dropin_user_record_by_uid(uid, NULL, flags, ret); if (r >= 0) return r; } if (!FLAGS_SET(flags, USERDB_EXCLUDE_NSS) && !iterator->nss_covered) { r = userdb_iterator_block_nss_systemd(iterator); if (r >= 0) { /* Client-side NSS fallback */ r = nss_user_record_by_uid(uid, !FLAGS_SET(flags, USERDB_SUPPRESS_SHADOW), ret); if (r >= 0) return r; } } if (!FLAGS_SET(flags, USERDB_DONT_SYNTHESIZE)) { if (uid == 0) return synthetic_root_user_build(ret); if (uid == UID_NOBODY && synthesize_nobody()) return synthetic_nobody_user_build(ret); } return r; } int userdb_all(UserDBFlags flags, UserDBIterator **ret) { _cleanup_(userdb_iterator_freep) UserDBIterator *iterator = NULL; int r, qr; assert(ret); iterator = userdb_iterator_new(LOOKUP_USER, flags); if (!iterator) return -ENOMEM; qr = userdb_start_query(iterator, "io.systemd.UserDatabase.GetUserRecord", true, NULL, flags); if (!FLAGS_SET(flags, USERDB_EXCLUDE_NSS) && (qr < 0 || !iterator->nss_covered)) { r = userdb_iterator_block_nss_systemd(iterator); if (r < 0) return r; setpwent(); iterator->nss_iterating = true; } if (!FLAGS_SET(flags, USERDB_EXCLUDE_DROPIN) && (qr < 0 || !iterator->dropin_covered)) { r = conf_files_list_nulstr( &iterator->dropins, ".user", NULL, CONF_FILES_REGULAR|CONF_FILES_FILTER_MASKED, USERDB_DROPIN_DIR_NULSTR("userdb")); if (r < 0) log_debug_errno(r, "Failed to find user drop-ins, ignoring: %m"); } /* propagate IPC error, but only if there are no drop-ins */ if (qr < 0 && !iterator->nss_iterating && strv_isempty(iterator->dropins)) return qr; *ret = TAKE_PTR(iterator); return 0; } int userdb_iterator_get(UserDBIterator *iterator, UserRecord **ret) { int r; assert(iterator); assert(iterator->what == LOOKUP_USER); if (iterator->nss_iterating) { struct passwd *pw; /* If NSS isn't covered elsewhere, let's iterate through it first, since it probably contains * the more traditional sources, which are probably good to show first. */ errno = 0; pw = getpwent(); if (pw) { _cleanup_free_ char *buffer = NULL; bool incomplete = false; struct spwd spwd; if (streq_ptr(pw->pw_name, "root")) iterator->synthesize_root = false; if (pw->pw_uid == UID_NOBODY) iterator->synthesize_nobody = false; if (!FLAGS_SET(iterator->flags, USERDB_SUPPRESS_SHADOW)) { r = nss_spwd_for_passwd(pw, &spwd, &buffer); if (r < 0) { log_debug_errno(r, "Failed to acquire shadow entry for user %s, ignoring: %m", pw->pw_name); incomplete = ERRNO_IS_PRIVILEGE(r); } } else { r = -EUCLEAN; incomplete = true; } r = nss_passwd_to_user_record(pw, r >= 0 ? &spwd : NULL, ret); if (r < 0) return r; if (ret) (*ret)->incomplete = incomplete; iterator->n_found++; return r; } if (errno != 0) log_debug_errno(errno, "Failure to iterate NSS user database, ignoring: %m"); iterator->nss_iterating = false; endpwent(); } for (; iterator->dropins && iterator->dropins[iterator->current_dropin]; iterator->current_dropin++) { const char *i = iterator->dropins[iterator->current_dropin]; _cleanup_free_ char *fn = NULL; uid_t uid; char *e; /* Next, let's add in the static drop-ins, which are quick to retrieve */ r = path_extract_filename(i, &fn); if (r < 0) return r; e = endswith(fn, ".user"); /* not actually a .user file? Then skip to next */ if (!e) continue; *e = 0; /* Chop off suffix */ if (parse_uid(fn, &uid) < 0) /* not a UID .user file? Then skip to next */ continue; r = dropin_user_record_by_uid(uid, i, iterator->flags, ret); if (r < 0) { log_debug_errno(r, "Failed to parse user record for UID " UID_FMT ", ignoring: %m", uid); continue; /* If we failed to parse this record, let's suppress it from enumeration, * and continue with the next record. Maybe someone is dropping it files * and only partially wrote this one. */ } iterator->current_dropin++; /* make sure on the next call of userdb_iterator_get() we continue with the next dropin */ iterator->n_found++; return 0; } /* Then, let's return the users provided by varlink IPC */ r = userdb_process(iterator, ret, NULL, NULL, NULL); if (r < 0) { /* Finally, synthesize root + nobody if not done yet */ if (iterator->synthesize_root) { iterator->synthesize_root = false; iterator->n_found++; return synthetic_root_user_build(ret); } if (iterator->synthesize_nobody) { iterator->synthesize_nobody = false; iterator->n_found++; return synthetic_nobody_user_build(ret); } /* if we found at least one entry, then ignore errors and indicate that we reached the end */ if (iterator->n_found > 0) return -ESRCH; } return r; } static int synthetic_root_group_build(GroupRecord **ret) { return group_record_build( ret, JSON_BUILD_OBJECT(JSON_BUILD_PAIR("groupName", JSON_BUILD_CONST_STRING("root")), JSON_BUILD_PAIR("gid", JSON_BUILD_UNSIGNED(0)), JSON_BUILD_PAIR("disposition", JSON_BUILD_CONST_STRING("intrinsic")))); } static int synthetic_nobody_group_build(GroupRecord **ret) { return group_record_build( ret, JSON_BUILD_OBJECT(JSON_BUILD_PAIR("groupName", JSON_BUILD_CONST_STRING(NOBODY_GROUP_NAME)), JSON_BUILD_PAIR("gid", JSON_BUILD_UNSIGNED(GID_NOBODY)), JSON_BUILD_PAIR("disposition", JSON_BUILD_CONST_STRING("intrinsic")))); } int groupdb_by_name(const char *name, UserDBFlags flags, GroupRecord **ret) { _cleanup_(userdb_iterator_freep) UserDBIterator *iterator = NULL; _cleanup_(json_variant_unrefp) JsonVariant *query = NULL; int r; if (!valid_user_group_name(name, VALID_USER_RELAX)) return -EINVAL; r = json_build(&query, JSON_BUILD_OBJECT( JSON_BUILD_PAIR("groupName", JSON_BUILD_STRING(name)))); if (r < 0) return r; iterator = userdb_iterator_new(LOOKUP_GROUP, flags); if (!iterator) return -ENOMEM; r = userdb_start_query(iterator, "io.systemd.UserDatabase.GetGroupRecord", false, query, flags); if (r >= 0) { r = userdb_process(iterator, NULL, ret, NULL, NULL); if (r >= 0) return r; } if (!FLAGS_SET(flags, USERDB_EXCLUDE_DROPIN) && !(iterator && iterator->dropin_covered)) { r = dropin_group_record_by_name(name, NULL, flags, ret); if (r >= 0) return r; } if (!FLAGS_SET(flags, USERDB_EXCLUDE_NSS) && !(iterator && iterator->nss_covered)) { r = userdb_iterator_block_nss_systemd(iterator); if (r >= 0) { r = nss_group_record_by_name(name, !FLAGS_SET(flags, USERDB_SUPPRESS_SHADOW), ret); if (r >= 0) return r; } } if (!FLAGS_SET(flags, USERDB_DONT_SYNTHESIZE)) { if (streq(name, "root")) return synthetic_root_group_build(ret); if (streq(name, NOBODY_GROUP_NAME) && synthesize_nobody()) return synthetic_nobody_group_build(ret); } return r; } int groupdb_by_gid(gid_t gid, UserDBFlags flags, GroupRecord **ret) { _cleanup_(userdb_iterator_freep) UserDBIterator *iterator = NULL; _cleanup_(json_variant_unrefp) JsonVariant *query = NULL; int r; if (!gid_is_valid(gid)) return -EINVAL; r = json_build(&query, JSON_BUILD_OBJECT( JSON_BUILD_PAIR("gid", JSON_BUILD_UNSIGNED(gid)))); if (r < 0) return r; iterator = userdb_iterator_new(LOOKUP_GROUP, flags); if (!iterator) return -ENOMEM; r = userdb_start_query(iterator, "io.systemd.UserDatabase.GetGroupRecord", false, query, flags); if (r >= 0) { r = userdb_process(iterator, NULL, ret, NULL, NULL); if (r >= 0) return r; } if (!FLAGS_SET(flags, USERDB_EXCLUDE_DROPIN) && !(iterator && iterator->dropin_covered)) { r = dropin_group_record_by_gid(gid, NULL, flags, ret); if (r >= 0) return r; } if (!FLAGS_SET(flags, USERDB_EXCLUDE_NSS) && !(iterator && iterator->nss_covered)) { r = userdb_iterator_block_nss_systemd(iterator); if (r >= 0) { r = nss_group_record_by_gid(gid, !FLAGS_SET(flags, USERDB_SUPPRESS_SHADOW), ret); if (r >= 0) return r; } } if (!FLAGS_SET(flags, USERDB_DONT_SYNTHESIZE)) { if (gid == 0) return synthetic_root_group_build(ret); if (gid == GID_NOBODY && synthesize_nobody()) return synthetic_nobody_group_build(ret); } return r; } int groupdb_all(UserDBFlags flags, UserDBIterator **ret) { _cleanup_(userdb_iterator_freep) UserDBIterator *iterator = NULL; int r, qr; assert(ret); iterator = userdb_iterator_new(LOOKUP_GROUP, flags); if (!iterator) return -ENOMEM; qr = userdb_start_query(iterator, "io.systemd.UserDatabase.GetGroupRecord", true, NULL, flags); if (!FLAGS_SET(flags, USERDB_EXCLUDE_NSS) && (qr < 0 || !iterator->nss_covered)) { r = userdb_iterator_block_nss_systemd(iterator); if (r < 0) return r; setgrent(); iterator->nss_iterating = true; } if (!FLAGS_SET(flags, USERDB_EXCLUDE_DROPIN) && (qr < 0 || !iterator->dropin_covered)) { r = conf_files_list_nulstr( &iterator->dropins, ".group", NULL, CONF_FILES_REGULAR|CONF_FILES_FILTER_MASKED, USERDB_DROPIN_DIR_NULSTR("userdb")); if (r < 0) log_debug_errno(r, "Failed to find group drop-ins, ignoring: %m"); } if (qr < 0 && !iterator->nss_iterating && strv_isempty(iterator->dropins)) return qr; *ret = TAKE_PTR(iterator); return 0; } int groupdb_iterator_get(UserDBIterator *iterator, GroupRecord **ret) { int r; assert(iterator); assert(iterator->what == LOOKUP_GROUP); if (iterator->nss_iterating) { struct group *gr; errno = 0; gr = getgrent(); if (gr) { _cleanup_free_ char *buffer = NULL; bool incomplete = false; struct sgrp sgrp; if (streq_ptr(gr->gr_name, "root")) iterator->synthesize_root = false; if (gr->gr_gid == GID_NOBODY) iterator->synthesize_nobody = false; if (!FLAGS_SET(iterator->flags, USERDB_SUPPRESS_SHADOW)) { r = nss_sgrp_for_group(gr, &sgrp, &buffer); if (r < 0) { log_debug_errno(r, "Failed to acquire shadow entry for group %s, ignoring: %m", gr->gr_name); incomplete = ERRNO_IS_PRIVILEGE(r); } } else { r = -EUCLEAN; incomplete = true; } r = nss_group_to_group_record(gr, r >= 0 ? &sgrp : NULL, ret); if (r < 0) return r; if (ret) (*ret)->incomplete = incomplete; iterator->n_found++; return r; } if (errno != 0) log_debug_errno(errno, "Failure to iterate NSS group database, ignoring: %m"); iterator->nss_iterating = false; endgrent(); } for (; iterator->dropins && iterator->dropins[iterator->current_dropin]; iterator->current_dropin++) { const char *i = iterator->dropins[iterator->current_dropin]; _cleanup_free_ char *fn = NULL; gid_t gid; char *e; r = path_extract_filename(i, &fn); if (r < 0) return r; e = endswith(fn, ".group"); if (!e) continue; *e = 0; /* Chop off suffix */ if (parse_gid(fn, &gid) < 0) continue; r = dropin_group_record_by_gid(gid, i, iterator->flags, ret); if (r < 0) { log_debug_errno(r, "Failed to parse group record for GID " GID_FMT ", ignoring: %m", gid); continue; } iterator->current_dropin++; iterator->n_found++; return 0; } r = userdb_process(iterator, NULL, ret, NULL, NULL); if (r < 0) { if (iterator->synthesize_root) { iterator->synthesize_root = false; iterator->n_found++; return synthetic_root_group_build(ret); } if (iterator->synthesize_nobody) { iterator->synthesize_nobody = false; iterator->n_found++; return synthetic_nobody_group_build(ret); } /* if we found at least one entry, then ignore errors and indicate that we reached the end */ if (iterator->n_found > 0) return -ESRCH; } return r; } static void discover_membership_dropins(UserDBIterator *i, UserDBFlags flags) { int r; r = conf_files_list_nulstr( &i->dropins, ".membership", NULL, CONF_FILES_REGULAR|CONF_FILES_BASENAME|CONF_FILES_FILTER_MASKED, USERDB_DROPIN_DIR_NULSTR("userdb")); if (r < 0) log_debug_errno(r, "Failed to find membership drop-ins, ignoring: %m"); } int membershipdb_by_user(const char *name, UserDBFlags flags, UserDBIterator **ret) { _cleanup_(userdb_iterator_freep) UserDBIterator *iterator = NULL; _cleanup_(json_variant_unrefp) JsonVariant *query = NULL; int r, qr; assert(ret); if (!valid_user_group_name(name, VALID_USER_RELAX)) return -EINVAL; r = json_build(&query, JSON_BUILD_OBJECT( JSON_BUILD_PAIR("userName", JSON_BUILD_STRING(name)))); if (r < 0) return r; iterator = userdb_iterator_new(LOOKUP_MEMBERSHIP, flags); if (!iterator) return -ENOMEM; iterator->filter_user_name = strdup(name); if (!iterator->filter_user_name) return -ENOMEM; qr = userdb_start_query(iterator, "io.systemd.UserDatabase.GetMemberships", true, query, flags); if (!FLAGS_SET(flags, USERDB_EXCLUDE_NSS) && (qr < 0 || !iterator->nss_covered)) { r = userdb_iterator_block_nss_systemd(iterator); if (r < 0) return r; setgrent(); iterator->nss_iterating = true; } if (!FLAGS_SET(flags, USERDB_EXCLUDE_DROPIN) && (qr < 0 || !iterator->dropin_covered)) discover_membership_dropins(iterator, flags); if (qr < 0 && !iterator->nss_iterating && strv_isempty(iterator->dropins)) return qr; *ret = TAKE_PTR(iterator); return 0; } int membershipdb_by_group(const char *name, UserDBFlags flags, UserDBIterator **ret) { _cleanup_(userdb_iterator_freep) UserDBIterator *iterator = NULL; _cleanup_(json_variant_unrefp) JsonVariant *query = NULL; int r, qr; assert(ret); if (!valid_user_group_name(name, VALID_USER_RELAX)) return -EINVAL; r = json_build(&query, JSON_BUILD_OBJECT( JSON_BUILD_PAIR("groupName", JSON_BUILD_STRING(name)))); if (r < 0) return r; iterator = userdb_iterator_new(LOOKUP_MEMBERSHIP, flags); if (!iterator) return -ENOMEM; iterator->filter_group_name = strdup(name); if (!iterator->filter_group_name) return -ENOMEM; qr = userdb_start_query(iterator, "io.systemd.UserDatabase.GetMemberships", true, query, flags); if (!FLAGS_SET(flags, USERDB_EXCLUDE_NSS) && (qr < 0 || !iterator->nss_covered)) { _cleanup_(group_record_unrefp) GroupRecord *gr = NULL; r = userdb_iterator_block_nss_systemd(iterator); if (r < 0) return r; /* We ignore all errors here, since the group might be defined by a userdb native service, and we queried them already above. */ (void) nss_group_record_by_name(name, false, &gr); if (gr) { iterator->members_of_group = strv_copy(gr->members); if (!iterator->members_of_group) return -ENOMEM; iterator->index_members_of_group = 0; iterator->found_group_name = strdup(name); if (!iterator->found_group_name) return -ENOMEM; } } if (!FLAGS_SET(flags, USERDB_EXCLUDE_DROPIN) && (qr < 0 || !iterator->dropin_covered)) discover_membership_dropins(iterator, flags); if (qr < 0 && strv_isempty(iterator->members_of_group) && strv_isempty(iterator->dropins)) return qr; *ret = TAKE_PTR(iterator); return 0; } int membershipdb_all(UserDBFlags flags, UserDBIterator **ret) { _cleanup_(userdb_iterator_freep) UserDBIterator *iterator = NULL; int r, qr; assert(ret); iterator = userdb_iterator_new(LOOKUP_MEMBERSHIP, flags); if (!iterator) return -ENOMEM; qr = userdb_start_query(iterator, "io.systemd.UserDatabase.GetMemberships", true, NULL, flags); if (!FLAGS_SET(flags, USERDB_EXCLUDE_NSS) && (qr < 0 || !iterator->nss_covered)) { r = userdb_iterator_block_nss_systemd(iterator); if (r < 0) return r; setgrent(); iterator->nss_iterating = true; } if (!FLAGS_SET(flags, USERDB_EXCLUDE_DROPIN) && (qr < 0 || !iterator->dropin_covered)) discover_membership_dropins(iterator, flags); if (qr < 0 && !iterator->nss_iterating && strv_isempty(iterator->dropins)) return qr; *ret = TAKE_PTR(iterator); return 0; } int membershipdb_iterator_get( UserDBIterator *iterator, char **ret_user, char **ret_group) { int r; assert(iterator); for (;;) { /* If we are iterating through NSS acquire a new group entry if we haven't acquired one yet. */ if (!iterator->members_of_group) { struct group *g; if (!iterator->nss_iterating) break; assert(!iterator->found_user_name); do { errno = 0; g = getgrent(); if (!g) { if (errno != 0) log_debug_errno(errno, "Failure during NSS group iteration, ignoring: %m"); break; } } while (iterator->filter_user_name ? !strv_contains(g->gr_mem, iterator->filter_user_name) : strv_isempty(g->gr_mem)); if (g) { r = free_and_strdup(&iterator->found_group_name, g->gr_name); if (r < 0) return r; if (iterator->filter_user_name) iterator->members_of_group = strv_new(iterator->filter_user_name); else iterator->members_of_group = strv_copy(g->gr_mem); if (!iterator->members_of_group) return -ENOMEM; iterator->index_members_of_group = 0; } else { iterator->nss_iterating = false; endgrent(); break; } } assert(iterator->found_group_name); assert(iterator->members_of_group); assert(!iterator->found_user_name); if (iterator->members_of_group[iterator->index_members_of_group]) { _cleanup_free_ char *cu = NULL, *cg = NULL; if (ret_user) { cu = strdup(iterator->members_of_group[iterator->index_members_of_group]); if (!cu) return -ENOMEM; } if (ret_group) { cg = strdup(iterator->found_group_name); if (!cg) return -ENOMEM; } if (ret_user) *ret_user = TAKE_PTR(cu); if (ret_group) *ret_group = TAKE_PTR(cg); iterator->index_members_of_group++; return 0; } iterator->members_of_group = strv_free(iterator->members_of_group); iterator->found_group_name = mfree(iterator->found_group_name); } for (; iterator->dropins && iterator->dropins[iterator->current_dropin]; iterator->current_dropin++) { const char *i = iterator->dropins[iterator->current_dropin], *e, *c; _cleanup_free_ char *un = NULL, *gn = NULL; e = endswith(i, ".membership"); if (!e) continue; c = memchr(i, ':', e - i); if (!c) continue; un = strndup(i, c - i); if (!un) return -ENOMEM; if (iterator->filter_user_name) { if (!streq(un, iterator->filter_user_name)) continue; } else if (!valid_user_group_name(un, VALID_USER_RELAX)) continue; c++; /* skip over ':' */ gn = strndup(c, e - c); if (!gn) return -ENOMEM; if (iterator->filter_group_name) { if (!streq(gn, iterator->filter_group_name)) continue; } else if (!valid_user_group_name(gn, VALID_USER_RELAX)) continue; iterator->current_dropin++; iterator->n_found++; if (ret_user) *ret_user = TAKE_PTR(un); if (ret_group) *ret_group = TAKE_PTR(gn); return 0; } r = userdb_process(iterator, NULL, NULL, ret_user, ret_group); if (r < 0 && iterator->n_found > 0) return -ESRCH; return r; } int membershipdb_by_group_strv(const char *name, UserDBFlags flags, char ***ret) { _cleanup_(userdb_iterator_freep) UserDBIterator *iterator = NULL; _cleanup_strv_free_ char **members = NULL; int r; assert(name); assert(ret); r = membershipdb_by_group(name, flags, &iterator); if (r < 0) return r; for (;;) { _cleanup_free_ char *user_name = NULL; r = membershipdb_iterator_get(iterator, &user_name, NULL); if (r == -ESRCH) break; if (r < 0) return r; r = strv_consume(&members, TAKE_PTR(user_name)); if (r < 0) return r; } strv_sort(members); strv_uniq(members); *ret = TAKE_PTR(members); return 0; } int userdb_block_nss_systemd(int b) { _cleanup_(dlclosep) void *dl = NULL; int (*call)(bool b); /* Note that we might be called from libnss_systemd.so.2 itself, but that should be fine, really. */ dl = dlopen(LIBDIR "/libnss_systemd.so.2", RTLD_NOW|RTLD_NODELETE); if (!dl) { /* If the file isn't installed, don't complain loudly */ log_debug("Failed to dlopen(libnss_systemd.so.2), ignoring: %s", dlerror()); return 0; } call = (int (*)(bool b)) dlsym(dl, "_nss_systemd_block"); if (!call) /* If the file is installed but lacks the symbol we expect, things are weird, let's complain */ return log_debug_errno(SYNTHETIC_ERRNO(ELIBBAD), "Unable to find symbol _nss_systemd_block in libnss_systemd.so.2: %s", dlerror()); return call(b); }