diff options
Diffstat (limited to 'src/login/pam_systemd.c')
| -rw-r--r-- | src/login/pam_systemd.c | 770 |
1 files changed, 770 insertions, 0 deletions
diff --git a/src/login/pam_systemd.c b/src/login/pam_systemd.c new file mode 100644 index 0000000..997b74e --- /dev/null +++ b/src/login/pam_systemd.c @@ -0,0 +1,770 @@ +/* SPDX-License-Identifier: LGPL-2.1+ */ + +#include <endian.h> +#include <errno.h> +#include <fcntl.h> +#include <pwd.h> +#include <security/_pam_macros.h> +#include <security/pam_ext.h> +#include <security/pam_misc.h> +#include <security/pam_modules.h> +#include <security/pam_modutil.h> +#include <sys/file.h> + +#include "alloc-util.h" +#include "audit-util.h" +#include "bus-common-errors.h" +#include "bus-error.h" +#include "bus-util.h" +#include "cgroup-util.h" +#include "def.h" +#include "fd-util.h" +#include "fileio.h" +#include "format-util.h" +#include "hostname-util.h" +#include "login-util.h" +#include "macro.h" +#include "parse-util.h" +#include "path-util.h" +#include "process-util.h" +#include "socket-util.h" +#include "stdio-util.h" +#include "strv.h" +#include "terminal-util.h" +#include "util.h" + +static int parse_argv( + pam_handle_t *handle, + int argc, const char **argv, + const char **class, + const char **type, + const char **desktop, + bool *debug) { + + unsigned i; + + assert(argc >= 0); + assert(argc == 0 || argv); + + for (i = 0; i < (unsigned) argc; i++) { + if (startswith(argv[i], "class=")) { + if (class) + *class = argv[i] + 6; + + } else if (startswith(argv[i], "type=")) { + if (type) + *type = argv[i] + 5; + + } else if (startswith(argv[i], "desktop=")) { + if (desktop) + *desktop = argv[i] + 8; + + } else if (streq(argv[i], "debug")) { + if (debug) + *debug = true; + + } else if (startswith(argv[i], "debug=")) { + int k; + + k = parse_boolean(argv[i] + 6); + if (k < 0) + pam_syslog(handle, LOG_WARNING, "Failed to parse debug= argument, ignoring."); + else if (debug) + *debug = k; + + } else + pam_syslog(handle, LOG_WARNING, "Unknown parameter '%s', ignoring", argv[i]); + } + + return 0; +} + +static int get_user_data( + pam_handle_t *handle, + const char **ret_username, + struct passwd **ret_pw) { + + const char *username = NULL; + struct passwd *pw = NULL; + int r; + + assert(handle); + assert(ret_username); + assert(ret_pw); + + r = pam_get_user(handle, &username, NULL); + if (r != PAM_SUCCESS) { + pam_syslog(handle, LOG_ERR, "Failed to get user name."); + return r; + } + + if (isempty(username)) { + pam_syslog(handle, LOG_ERR, "User name not valid."); + return PAM_AUTH_ERR; + } + + pw = pam_modutil_getpwnam(handle, username); + if (!pw) { + pam_syslog(handle, LOG_ERR, "Failed to get user data."); + return PAM_USER_UNKNOWN; + } + + *ret_pw = pw; + *ret_username = username; + + return PAM_SUCCESS; +} + +static int socket_from_display(const char *display, char **path) { + size_t k; + char *f, *c; + + assert(display); + assert(path); + + if (!display_is_local(display)) + return -EINVAL; + + k = strspn(display+1, "0123456789"); + + f = new(char, STRLEN("/tmp/.X11-unix/X") + k + 1); + if (!f) + return -ENOMEM; + + c = stpcpy(f, "/tmp/.X11-unix/X"); + memcpy(c, display+1, k); + c[k] = 0; + + *path = f; + + return 0; +} + +static int get_seat_from_display(const char *display, const char **seat, uint32_t *vtnr) { + union sockaddr_union sa = {}; + _cleanup_free_ char *p = NULL, *tty = NULL; + _cleanup_close_ int fd = -1; + struct ucred ucred; + int v, r, salen; + + assert(display); + assert(vtnr); + + /* We deduce the X11 socket from the display name, then use + * SO_PEERCRED to determine the X11 server process, ask for + * the controlling tty of that and if it's a VC then we know + * the seat and the virtual terminal. Sounds ugly, is only + * semi-ugly. */ + + r = socket_from_display(display, &p); + if (r < 0) + return r; + salen = sockaddr_un_set_path(&sa.un, p); + if (salen < 0) + return salen; + + fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0); + if (fd < 0) + return -errno; + + if (connect(fd, &sa.sa, salen) < 0) + return -errno; + + r = getpeercred(fd, &ucred); + if (r < 0) + return r; + + r = get_ctty(ucred.pid, NULL, &tty); + if (r < 0) + return r; + + v = vtnr_from_tty(tty); + if (v < 0) + return v; + else if (v == 0) + return -ENOENT; + + if (seat) + *seat = "seat0"; + *vtnr = (uint32_t) v; + + return 0; +} + +static int export_legacy_dbus_address( + pam_handle_t *handle, + uid_t uid, + const char *runtime) { + + const char *s; + _cleanup_free_ char *t = NULL; + int r = PAM_BUF_ERR; + + /* We need to export $DBUS_SESSION_BUS_ADDRESS because various applications will not connect + * correctly to the bus without it. This setting matches what dbus.socket does for the user + * session using 'systemctl --user set-environment'. We want to have the same configuration + * in processes started from the PAM session. + * + * The setting of the address is guarded by the access() check because it is also possible to compile + * dbus without --enable-user-session, in which case this socket is not used, and + * $DBUS_SESSION_BUS_ADDRESS should not be set. An alternative approach would to not do the access() + * check here, and let applications try on their own, by using "unix:path=%s/bus;autolaunch:". But we + * expect the socket to be present by the time we do this check, so we can just as well check once + * here. */ + + s = strjoina(runtime, "/bus"); + if (access(s, F_OK) < 0) + return PAM_SUCCESS; + + if (asprintf(&t, DEFAULT_USER_BUS_ADDRESS_FMT, runtime) < 0) + goto error; + + r = pam_misc_setenv(handle, "DBUS_SESSION_BUS_ADDRESS", t, 0); + if (r != PAM_SUCCESS) + goto error; + + return PAM_SUCCESS; + +error: + pam_syslog(handle, LOG_ERR, "Failed to set bus variable."); + return r; +} + +static int append_session_memory_max(pam_handle_t *handle, sd_bus_message *m, const char *limit) { + uint64_t val; + int r; + + if (isempty(limit)) + return 0; + + if (streq(limit, "infinity")) { + r = sd_bus_message_append(m, "(sv)", "MemoryMax", "t", (uint64_t)-1); + if (r < 0) { + pam_syslog(handle, LOG_ERR, "Failed to append to bus message: %s", strerror(-r)); + return r; + } + } else { + r = parse_permille(limit); + if (r >= 0) { + r = sd_bus_message_append(m, "(sv)", "MemoryMaxScale", "u", (uint32_t) (((uint64_t) r * UINT32_MAX) / 1000U)); + if (r < 0) { + pam_syslog(handle, LOG_ERR, "Failed to append to bus message: %s", strerror(-r)); + return r; + } + } else { + r = parse_size(limit, 1024, &val); + if (r >= 0) { + r = sd_bus_message_append(m, "(sv)", "MemoryMax", "t", val); + if (r < 0) { + pam_syslog(handle, LOG_ERR, "Failed to append to bus message: %s", strerror(-r)); + return r; + } + } else + pam_syslog(handle, LOG_WARNING, "Failed to parse systemd.limit: %s, ignoring.", limit); + } + } + + return 0; +} + +static int append_session_tasks_max(pam_handle_t *handle, sd_bus_message *m, const char *limit) { + uint64_t val; + int r; + + /* No need to parse "infinity" here, it will be set unconditionally later in manager_start_scope() */ + if (isempty(limit) || streq(limit, "infinity")) + return 0; + + r = safe_atou64(limit, &val); + if (r >= 0) { + r = sd_bus_message_append(m, "(sv)", "TasksMax", "t", val); + if (r < 0) { + pam_syslog(handle, LOG_ERR, "Failed to append to bus message: %s", strerror(-r)); + return r; + } + } else + pam_syslog(handle, LOG_WARNING, "Failed to parse systemd.limit: %s, ignoring.", limit); + + return 0; +} + +static int append_session_cg_weight(pam_handle_t *handle, sd_bus_message *m, const char *limit, const char *field) { + uint64_t val; + int r; + + if (isempty(limit)) + return 0; + + r = cg_weight_parse(limit, &val); + if (r >= 0) { + r = sd_bus_message_append(m, "(sv)", field, "t", val); + if (r < 0) { + pam_syslog(handle, LOG_ERR, "Failed to append to bus message: %s", strerror(-r)); + return r; + } + } else if (streq(field, "CPUWeight")) + pam_syslog(handle, LOG_WARNING, "Failed to parse systemd.cpu_weight: %s, ignoring.", limit); + else + pam_syslog(handle, LOG_WARNING, "Failed to parse systemd.io_weight: %s, ignoring.", limit); + + return 0; +} + +static const char* getenv_harder(pam_handle_t *handle, const char *key, const char *fallback) { + const char *v; + + assert(handle); + assert(key); + + /* Looks for an environment variable, preferrably in the environment block associated with the specified PAM + * handle, falling back to the process' block instead. */ + + v = pam_getenv(handle, key); + if (!isempty(v)) + return v; + + v = getenv(key); + if (!isempty(v)) + return v; + + return fallback; +} + +static int update_environment(pam_handle_t *handle, const char *key, const char *value) { + int r; + + assert(handle); + assert(key); + + /* Updates the environment, but only if there's actually a value set. Also, log about errors */ + + if (isempty(value)) + return PAM_SUCCESS; + + r = pam_misc_setenv(handle, key, value, 0); + if (r != PAM_SUCCESS) + pam_syslog(handle, LOG_ERR, "Failed to set environment variable %s.", key); + + return r; +} + +static bool validate_runtime_directory(pam_handle_t *handle, const char *path, uid_t uid) { + struct stat st; + + assert(path); + + /* Just some extra paranoia: let's not set $XDG_RUNTIME_DIR if the directory we'd set it to isn't actually set + * up properly for us. */ + + if (lstat(path, &st) < 0) { + pam_syslog(handle, LOG_ERR, "Failed to stat() runtime directory '%s': %s", path, strerror(errno)); + goto fail; + } + + if (!S_ISDIR(st.st_mode)) { + pam_syslog(handle, LOG_ERR, "Runtime directory '%s' is not actually a directory.", path); + goto fail; + } + + if (st.st_uid != uid) { + pam_syslog(handle, LOG_ERR, "Runtime directory '%s' is not owned by UID " UID_FMT ", as it should.", path, uid); + goto fail; + } + + return true; + +fail: + pam_syslog(handle, LOG_WARNING, "Not setting $XDG_RUNTIME_DIR, as the directory is not in order."); + return false; +} + +_public_ PAM_EXTERN int pam_sm_open_session( + pam_handle_t *handle, + int flags, + int argc, const char **argv) { + + _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; + _cleanup_(sd_bus_message_unrefp) sd_bus_message *m = NULL, *reply = NULL; + const char + *username, *id, *object_path, *runtime_path, + *service = NULL, + *tty = NULL, *display = NULL, + *remote_user = NULL, *remote_host = NULL, + *seat = NULL, + *type = NULL, *class = NULL, + *class_pam = NULL, *type_pam = NULL, *cvtnr = NULL, *desktop = NULL, *desktop_pam = NULL, + *memory_max = NULL, *tasks_max = NULL, *cpu_weight = NULL, *io_weight = NULL; + _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL; + int session_fd = -1, existing, r; + bool debug = false, remote; + struct passwd *pw; + uint32_t vtnr = 0; + uid_t original_uid; + + assert(handle); + + /* Make this a NOP on non-logind systems */ + if (!logind_running()) + return PAM_SUCCESS; + + if (parse_argv(handle, + argc, argv, + &class_pam, + &type_pam, + &desktop_pam, + &debug) < 0) + return PAM_SESSION_ERR; + + if (debug) + pam_syslog(handle, LOG_DEBUG, "pam-systemd initializing"); + + r = get_user_data(handle, &username, &pw); + if (r != PAM_SUCCESS) { + pam_syslog(handle, LOG_ERR, "Failed to get user data."); + return r; + } + + /* Make sure we don't enter a loop by talking to + * systemd-logind when it is actually waiting for the + * background to finish start-up. If the service is + * "systemd-user" we simply set XDG_RUNTIME_DIR and + * leave. */ + + pam_get_item(handle, PAM_SERVICE, (const void**) &service); + if (streq_ptr(service, "systemd-user")) { + char rt[STRLEN("/run/user/") + DECIMAL_STR_MAX(uid_t)]; + + xsprintf(rt, "/run/user/"UID_FMT, pw->pw_uid); + if (validate_runtime_directory(handle, rt, pw->pw_uid)) { + r = pam_misc_setenv(handle, "XDG_RUNTIME_DIR", rt, 0); + if (r != PAM_SUCCESS) { + pam_syslog(handle, LOG_ERR, "Failed to set runtime dir."); + return r; + } + } + + r = export_legacy_dbus_address(handle, pw->pw_uid, rt); + if (r != PAM_SUCCESS) + return r; + + return PAM_SUCCESS; + } + + /* Otherwise, we ask logind to create a session for us */ + + pam_get_item(handle, PAM_XDISPLAY, (const void**) &display); + pam_get_item(handle, PAM_TTY, (const void**) &tty); + pam_get_item(handle, PAM_RUSER, (const void**) &remote_user); + pam_get_item(handle, PAM_RHOST, (const void**) &remote_host); + + seat = getenv_harder(handle, "XDG_SEAT", NULL); + cvtnr = getenv_harder(handle, "XDG_VTNR", NULL); + type = getenv_harder(handle, "XDG_SESSION_TYPE", type_pam); + class = getenv_harder(handle, "XDG_SESSION_CLASS", class_pam); + desktop = getenv_harder(handle, "XDG_SESSION_DESKTOP", desktop_pam); + + tty = strempty(tty); + + if (strchr(tty, ':')) { + /* A tty with a colon is usually an X11 display, placed there to show up in utmp. We rearrange things + * and don't pretend that an X display was a tty. */ + if (isempty(display)) + display = tty; + tty = NULL; + + } else if (streq(tty, "cron")) { + /* cron is setting PAM_TTY to "cron" for some reason (the commit carries no information why, but + * probably because it wants to set it to something as pam_time/pam_access/… require PAM_TTY to be set + * (as they otherwise even try to update it!) — but cron doesn't actually allocate a TTY for its forked + * off processes.) */ + type = "unspecified"; + class = "background"; + tty = NULL; + + } else if (streq(tty, "ssh")) { + /* ssh has been setting PAM_TTY to "ssh" (for the same reason as cron does this, see above. For further + * details look for "PAM_TTY_KLUDGE" in the openssh sources). */ + type ="tty"; + class = "user"; + tty = NULL; /* This one is particularly sad, as this means that ssh sessions — even though usually + * associated with a pty — won't be tracked by their tty in logind. This is because ssh + * does the PAM session registration early for new connections, and registers a pty only + * much later (this is because it doesn't know yet if it needs one at all, as whether to + * register a pty or not is negotiated much later in the protocol). */ + + } else + /* Chop off leading /dev prefix that some clients specify, but others do not. */ + tty = skip_dev_prefix(tty); + + /* If this fails vtnr will be 0, that's intended */ + if (!isempty(cvtnr)) + (void) safe_atou32(cvtnr, &vtnr); + + if (!isempty(display) && !vtnr) { + if (isempty(seat)) + (void) get_seat_from_display(display, &seat, &vtnr); + else if (streq(seat, "seat0")) + (void) get_seat_from_display(display, NULL, &vtnr); + } + + if (seat && !streq(seat, "seat0") && vtnr != 0) { + if (debug) + pam_syslog(handle, LOG_DEBUG, "Ignoring vtnr %"PRIu32" for %s which is not seat0", vtnr, seat); + vtnr = 0; + } + + if (isempty(type)) + type = !isempty(display) ? "x11" : + !isempty(tty) ? "tty" : "unspecified"; + + if (isempty(class)) + class = streq(type, "unspecified") ? "background" : "user"; + + remote = !isempty(remote_host) && !is_localhost(remote_host); + + (void) pam_get_data(handle, "systemd.memory_max", (const void **)&memory_max); + (void) pam_get_data(handle, "systemd.tasks_max", (const void **)&tasks_max); + (void) pam_get_data(handle, "systemd.cpu_weight", (const void **)&cpu_weight); + (void) pam_get_data(handle, "systemd.io_weight", (const void **)&io_weight); + + /* Talk to logind over the message bus */ + + r = sd_bus_open_system(&bus); + if (r < 0) { + pam_syslog(handle, LOG_ERR, "Failed to connect to system bus: %s", strerror(-r)); + return PAM_SESSION_ERR; + } + + if (debug) { + pam_syslog(handle, LOG_DEBUG, "Asking logind to create session: " + "uid="UID_FMT" pid="PID_FMT" service=%s type=%s class=%s desktop=%s seat=%s vtnr=%"PRIu32" tty=%s display=%s remote=%s remote_user=%s remote_host=%s", + pw->pw_uid, getpid_cached(), + strempty(service), + type, class, strempty(desktop), + strempty(seat), vtnr, strempty(tty), strempty(display), + yes_no(remote), strempty(remote_user), strempty(remote_host)); + pam_syslog(handle, LOG_DEBUG, "Session limits: " + "memory_max=%s tasks_max=%s cpu_weight=%s io_weight=%s", + strna(memory_max), strna(tasks_max), strna(cpu_weight), strna(io_weight)); + } + + r = sd_bus_message_new_method_call( + bus, + &m, + "org.freedesktop.login1", + "/org/freedesktop/login1", + "org.freedesktop.login1.Manager", + "CreateSession"); + if (r < 0) { + pam_syslog(handle, LOG_ERR, "Failed to create CreateSession method call: %s", strerror(-r)); + return PAM_SESSION_ERR; + } + + r = sd_bus_message_append(m, "uusssssussbss", + (uint32_t) pw->pw_uid, + 0, + service, + type, + class, + desktop, + seat, + vtnr, + tty, + display, + remote, + remote_user, + remote_host); + if (r < 0) { + pam_syslog(handle, LOG_ERR, "Failed to append to bus message: %s", strerror(-r)); + return PAM_SESSION_ERR; + } + + r = sd_bus_message_open_container(m, 'a', "(sv)"); + if (r < 0) { + pam_syslog(handle, LOG_ERR, "Failed to open message container: %s", strerror(-r)); + return PAM_SYSTEM_ERR; + } + + r = append_session_memory_max(handle, m, memory_max); + if (r < 0) + return PAM_SESSION_ERR; + + r = append_session_tasks_max(handle, m, tasks_max); + if (r < 0) + return PAM_SESSION_ERR; + + r = append_session_cg_weight(handle, m, cpu_weight, "CPUWeight"); + if (r < 0) + return PAM_SESSION_ERR; + + r = append_session_cg_weight(handle, m, io_weight, "IOWeight"); + if (r < 0) + return PAM_SESSION_ERR; + + r = sd_bus_message_close_container(m); + if (r < 0) { + pam_syslog(handle, LOG_ERR, "Failed to close message container: %s", strerror(-r)); + return PAM_SYSTEM_ERR; + } + + r = sd_bus_call(bus, m, 0, &error, &reply); + if (r < 0) { + if (sd_bus_error_has_name(&error, BUS_ERROR_SESSION_BUSY)) { + if (debug) + pam_syslog(handle, LOG_DEBUG, "Not creating session: %s", bus_error_message(&error, r)); + return PAM_SUCCESS; + } else { + pam_syslog(handle, LOG_ERR, "Failed to create session: %s", bus_error_message(&error, r)); + return PAM_SYSTEM_ERR; + } + } + + r = sd_bus_message_read(reply, + "soshusub", + &id, + &object_path, + &runtime_path, + &session_fd, + &original_uid, + &seat, + &vtnr, + &existing); + if (r < 0) { + pam_syslog(handle, LOG_ERR, "Failed to parse message: %s", strerror(-r)); + return PAM_SESSION_ERR; + } + + if (debug) + pam_syslog(handle, LOG_DEBUG, "Reply from logind: " + "id=%s object_path=%s runtime_path=%s session_fd=%d seat=%s vtnr=%u original_uid=%u", + id, object_path, runtime_path, session_fd, seat, vtnr, original_uid); + + r = update_environment(handle, "XDG_SESSION_ID", id); + if (r != PAM_SUCCESS) + return r; + + if (original_uid == pw->pw_uid) { + /* Don't set $XDG_RUNTIME_DIR if the user we now + * authenticated for does not match the original user + * of the session. We do this in order not to result + * in privileged apps clobbering the runtime directory + * unnecessarily. */ + + if (validate_runtime_directory(handle, runtime_path, pw->pw_uid)) { + r = update_environment(handle, "XDG_RUNTIME_DIR", runtime_path); + if (r != PAM_SUCCESS) + return r; + } + + r = export_legacy_dbus_address(handle, pw->pw_uid, runtime_path); + if (r != PAM_SUCCESS) + return r; + } + + /* Most likely we got the session/type/class from environment variables, but might have gotten the data + * somewhere else (for example PAM module parameters). Let's now update the environment variables, so that this + * data is inherited into the session processes, and programs can rely on them to be initialized. */ + + r = update_environment(handle, "XDG_SESSION_TYPE", type); + if (r != PAM_SUCCESS) + return r; + + r = update_environment(handle, "XDG_SESSION_CLASS", class); + if (r != PAM_SUCCESS) + return r; + + r = update_environment(handle, "XDG_SESSION_DESKTOP", desktop); + if (r != PAM_SUCCESS) + return r; + + r = update_environment(handle, "XDG_SEAT", seat); + if (r != PAM_SUCCESS) + return r; + + if (vtnr > 0) { + char buf[DECIMAL_STR_MAX(vtnr)]; + sprintf(buf, "%u", vtnr); + + r = update_environment(handle, "XDG_VTNR", buf); + if (r != PAM_SUCCESS) + return r; + } + + r = pam_set_data(handle, "systemd.existing", INT_TO_PTR(!!existing), NULL); + if (r != PAM_SUCCESS) { + pam_syslog(handle, LOG_ERR, "Failed to install existing flag."); + return r; + } + + if (session_fd >= 0) { + session_fd = fcntl(session_fd, F_DUPFD_CLOEXEC, 3); + if (session_fd < 0) { + pam_syslog(handle, LOG_ERR, "Failed to dup session fd: %m"); + return PAM_SESSION_ERR; + } + + r = pam_set_data(handle, "systemd.session-fd", FD_TO_PTR(session_fd), NULL); + if (r != PAM_SUCCESS) { + pam_syslog(handle, LOG_ERR, "Failed to install session fd."); + safe_close(session_fd); + return r; + } + } + + return PAM_SUCCESS; +} + +_public_ PAM_EXTERN int pam_sm_close_session( + pam_handle_t *handle, + int flags, + int argc, const char **argv) { + + _cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL; + _cleanup_(sd_bus_flush_close_unrefp) sd_bus *bus = NULL; + const void *existing = NULL; + const char *id; + int r; + + assert(handle); + + /* Only release session if it wasn't pre-existing when we + * tried to create it */ + (void) pam_get_data(handle, "systemd.existing", &existing); + + id = pam_getenv(handle, "XDG_SESSION_ID"); + if (id && !existing) { + + /* Before we go and close the FIFO we need to tell + * logind that this is a clean session shutdown, so + * that it doesn't just go and slaughter us + * immediately after closing the fd */ + + r = sd_bus_open_system(&bus); + if (r < 0) { + pam_syslog(handle, LOG_ERR, "Failed to connect to system bus: %s", strerror(-r)); + return PAM_SESSION_ERR; + } + + r = sd_bus_call_method(bus, + "org.freedesktop.login1", + "/org/freedesktop/login1", + "org.freedesktop.login1.Manager", + "ReleaseSession", + &error, + NULL, + "s", + id); + if (r < 0) { + pam_syslog(handle, LOG_ERR, "Failed to release session: %s", bus_error_message(&error, r)); + return PAM_SESSION_ERR; + } + } + + /* Note that we are knowingly leaking the FIFO fd here. This + * way, logind can watch us die. If we closed it here it would + * not have any clue when that is completed. Given that one + * cannot really have multiple PAM sessions open from the same + * process this means we will leak one FD at max. */ + + return PAM_SUCCESS; +} |