716 lines
22 KiB
C
716 lines
22 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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/***
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Copyright © 2015 Werner Fink
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***/
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#include <errno.h>
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#include <fcntl.h>
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#include <getopt.h>
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#include <poll.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include <sys/prctl.h>
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#include <sys/signalfd.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/un.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include "alloc-util.h"
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#include "ask-password-api.h"
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#include "conf-parser.h"
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#include "def.h"
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#include "dirent-util.h"
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#include "exit-status.h"
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#include "fd-util.h"
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#include "fileio.h"
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#include "fs-util.h"
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#include "hashmap.h"
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#include "io-util.h"
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#include "macro.h"
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#include "main-func.h"
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#include "memory-util.h"
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#include "mkdir.h"
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#include "path-util.h"
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#include "pretty-print.h"
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#include "process-util.h"
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#include "set.h"
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#include "signal-util.h"
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#include "socket-util.h"
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#include "string-util.h"
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#include "strv.h"
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#include "terminal-util.h"
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#include "utmp-wtmp.h"
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static enum {
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ACTION_LIST,
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ACTION_QUERY,
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ACTION_WATCH,
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ACTION_WALL,
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} arg_action = ACTION_QUERY;
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static bool arg_plymouth = false;
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static bool arg_console = false;
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static const char *arg_device = NULL;
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static int send_passwords(const char *socket_name, char **passwords) {
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_cleanup_(erase_and_freep) char *packet = NULL;
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_cleanup_close_ int socket_fd = -1;
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union sockaddr_union sa;
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socklen_t sa_len;
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size_t packet_length = 1;
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char **p, *d;
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ssize_t n;
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int r;
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assert(socket_name);
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r = sockaddr_un_set_path(&sa.un, socket_name);
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if (r < 0)
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return r;
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sa_len = r;
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STRV_FOREACH(p, passwords)
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packet_length += strlen(*p) + 1;
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packet = new(char, packet_length);
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if (!packet)
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return -ENOMEM;
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packet[0] = '+';
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d = packet + 1;
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STRV_FOREACH(p, passwords)
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d = stpcpy(d, *p) + 1;
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socket_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0);
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if (socket_fd < 0)
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return log_debug_errno(errno, "socket(): %m");
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n = sendto(socket_fd, packet, packet_length, MSG_NOSIGNAL, &sa.sa, sa_len);
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if (n < 0)
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return log_debug_errno(errno, "sendto(): %m");
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return (int) n;
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}
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static bool wall_tty_match(const char *path, void *userdata) {
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_cleanup_free_ char *p = NULL;
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_cleanup_close_ int fd = -1;
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struct stat st;
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if (!path_is_absolute(path))
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path = strjoina("/dev/", path);
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if (lstat(path, &st) < 0) {
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log_debug_errno(errno, "Failed to stat %s: %m", path);
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return true;
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}
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if (!S_ISCHR(st.st_mode)) {
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log_debug("%s is not a character device.", path);
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return true;
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}
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/* We use named pipes to ensure that wall messages suggesting
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* password entry are not printed over password prompts
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* already shown. We use the fact here that opening a pipe in
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* non-blocking mode for write-only will succeed only if
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* there's some writer behind it. Using pipes has the
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* advantage that the block will automatically go away if the
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* process dies. */
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if (asprintf(&p, "/run/systemd/ask-password-block/%u:%u", major(st.st_rdev), minor(st.st_rdev)) < 0) {
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log_oom();
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return true;
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}
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fd = open(p, O_WRONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
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if (fd < 0) {
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log_debug_errno(errno, "Failed to open the wall pipe: %m");
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return 1;
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}
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/* What, we managed to open the pipe? Then this tty is filtered. */
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return 0;
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}
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static int agent_ask_password_tty(
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const char *message,
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usec_t until,
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AskPasswordFlags flags,
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const char *flag_file,
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char ***ret) {
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int tty_fd = -1, r;
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if (arg_console) {
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const char *con = arg_device ?: "/dev/console";
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tty_fd = acquire_terminal(con, ACQUIRE_TERMINAL_WAIT, USEC_INFINITY);
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if (tty_fd < 0)
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return log_error_errno(tty_fd, "Failed to acquire %s: %m", con);
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r = reset_terminal_fd(tty_fd, true);
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if (r < 0)
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log_warning_errno(r, "Failed to reset terminal, ignoring: %m");
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}
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r = ask_password_tty(tty_fd, message, NULL, until, flags, flag_file, ret);
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if (arg_console) {
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tty_fd = safe_close(tty_fd);
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release_terminal();
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}
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return r;
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}
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static int process_one_password_file(const char *filename) {
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_cleanup_free_ char *socket_name = NULL, *message = NULL;
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bool accept_cached = false, echo = false;
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uint64_t not_after = 0;
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unsigned pid = 0;
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const ConfigTableItem items[] = {
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{ "Ask", "Socket", config_parse_string, 0, &socket_name },
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{ "Ask", "NotAfter", config_parse_uint64, 0, ¬_after },
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{ "Ask", "Message", config_parse_string, 0, &message },
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{ "Ask", "PID", config_parse_unsigned, 0, &pid },
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{ "Ask", "AcceptCached", config_parse_bool, 0, &accept_cached },
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{ "Ask", "Echo", config_parse_bool, 0, &echo },
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{}
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};
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int r;
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assert(filename);
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r = config_parse(NULL, filename, NULL,
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NULL,
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config_item_table_lookup, items,
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CONFIG_PARSE_RELAXED|CONFIG_PARSE_WARN,
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NULL,
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NULL);
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if (r < 0)
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return r;
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if (!socket_name)
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return log_error_errno(SYNTHETIC_ERRNO(EBADMSG),
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"Invalid password file %s", filename);
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if (not_after > 0 && now(CLOCK_MONOTONIC) > not_after)
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return 0;
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if (pid > 0 && !pid_is_alive(pid))
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return 0;
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switch (arg_action) {
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case ACTION_LIST:
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printf("'%s' (PID %u)\n", strna(message), pid);
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return 0;
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case ACTION_WALL: {
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_cleanup_free_ char *wall = NULL;
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if (asprintf(&wall,
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"Password entry required for \'%s\' (PID %u).\r\n"
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"Please enter password with the systemd-tty-ask-password-agent tool.",
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strna(message),
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pid) < 0)
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return log_oom();
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(void) utmp_wall(wall, NULL, NULL, wall_tty_match, NULL);
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return 0;
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}
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case ACTION_QUERY:
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case ACTION_WATCH: {
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_cleanup_strv_free_erase_ char **passwords = NULL;
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AskPasswordFlags flags = 0;
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if (access(socket_name, W_OK) < 0) {
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if (arg_action == ACTION_QUERY)
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log_info("Not querying '%s' (PID %u), lacking privileges.", strna(message), pid);
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return 0;
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}
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SET_FLAG(flags, ASK_PASSWORD_ACCEPT_CACHED, accept_cached);
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SET_FLAG(flags, ASK_PASSWORD_CONSOLE_COLOR, arg_console);
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SET_FLAG(flags, ASK_PASSWORD_ECHO, echo);
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if (arg_plymouth)
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r = ask_password_plymouth(message, not_after, flags, filename, &passwords);
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else
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r = agent_ask_password_tty(message, not_after, flags, filename, &passwords);
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if (r < 0) {
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/* If the query went away, that's OK */
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if (IN_SET(r, -ETIME, -ENOENT))
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return 0;
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return log_error_errno(r, "Failed to query password: %m");
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}
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if (strv_isempty(passwords))
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return -ECANCELED;
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r = send_passwords(socket_name, passwords);
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if (r < 0)
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return log_error_errno(r, "Failed to send: %m");
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break;
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}}
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return 0;
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}
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static int wall_tty_block(void) {
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_cleanup_free_ char *p = NULL;
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dev_t devnr;
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int fd, r;
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r = get_ctty_devnr(0, &devnr);
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if (r == -ENXIO) /* We have no controlling tty */
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return -ENOTTY;
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if (r < 0)
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return log_error_errno(r, "Failed to get controlling TTY: %m");
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if (asprintf(&p, "/run/systemd/ask-password-block/%u:%u", major(devnr), minor(devnr)) < 0)
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return log_oom();
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(void) mkdir_parents_label(p, 0700);
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(void) mkfifo(p, 0600);
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fd = open(p, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
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if (fd < 0)
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return log_debug_errno(errno, "Failed to open %s: %m", p);
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return fd;
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}
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static int process_password_files(void) {
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_cleanup_closedir_ DIR *d;
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struct dirent *de;
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int r = 0;
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d = opendir("/run/systemd/ask-password");
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if (!d) {
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if (errno == ENOENT)
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return 0;
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return log_error_errno(errno, "Failed to open /run/systemd/ask-password: %m");
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}
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FOREACH_DIRENT(de, d, return log_error_errno(errno, "Failed to read directory: %m")) {
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_cleanup_free_ char *p = NULL;
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int q;
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/* We only support /run on tmpfs, hence we can rely on
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* d_type to be reliable */
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if (de->d_type != DT_REG)
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continue;
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if (!startswith(de->d_name, "ask."))
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continue;
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p = path_join("/run/systemd/ask-password", de->d_name);
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if (!p)
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return log_oom();
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q = process_one_password_file(p);
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if (q < 0 && r == 0)
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r = q;
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}
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return r;
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}
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static int process_and_watch_password_files(bool watch) {
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enum {
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FD_SIGNAL,
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FD_INOTIFY,
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_FD_MAX
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};
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_cleanup_close_ int notify = -1, signal_fd = -1, tty_block_fd = -1;
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struct pollfd pollfd[_FD_MAX];
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sigset_t mask;
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int r;
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tty_block_fd = wall_tty_block();
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(void) mkdir_p_label("/run/systemd/ask-password", 0755);
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assert_se(sigemptyset(&mask) >= 0);
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assert_se(sigset_add_many(&mask, SIGTERM, -1) >= 0);
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assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) >= 0);
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if (watch) {
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signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
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if (signal_fd < 0)
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return log_error_errno(errno, "Failed to allocate signal file descriptor: %m");
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pollfd[FD_SIGNAL] = (struct pollfd) { .fd = signal_fd, .events = POLLIN };
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notify = inotify_init1(IN_CLOEXEC);
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if (notify < 0)
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return log_error_errno(errno, "Failed to allocate directory watch: %m");
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r = inotify_add_watch_and_warn(notify, "/run/systemd/ask-password", IN_CLOSE_WRITE|IN_MOVED_TO);
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if (r < 0)
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return r;
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pollfd[FD_INOTIFY] = (struct pollfd) { .fd = notify, .events = POLLIN };
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}
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for (;;) {
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int timeout = -1;
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r = process_password_files();
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if (r < 0) {
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if (r == -ECANCELED)
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/* Disable poll() timeout since at least one password has
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* been skipped and therefore one file remains and is
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* unlikely to trigger any events. */
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timeout = 0;
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else
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/* FIXME: we should do something here since otherwise the service
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* requesting the password won't notice the error and will wait
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* indefinitely. */
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log_error_errno(r, "Failed to process password: %m");
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}
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if (!watch)
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break;
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if (poll(pollfd, _FD_MAX, timeout) < 0) {
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if (errno == EINTR)
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continue;
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return -errno;
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}
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if (pollfd[FD_SIGNAL].revents & POLLNVAL ||
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pollfd[FD_INOTIFY].revents & POLLNVAL)
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return -EBADF;
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if (pollfd[FD_INOTIFY].revents != 0)
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(void) flush_fd(notify);
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if (pollfd[FD_SIGNAL].revents != 0)
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break;
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}
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return 0;
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}
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static int help(void) {
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_cleanup_free_ char *link = NULL;
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int r;
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r = terminal_urlify_man("systemd-tty-ask-password-agent", "1", &link);
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if (r < 0)
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return log_oom();
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printf("%s [OPTIONS...]\n\n"
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"Process system password requests.\n\n"
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" -h --help Show this help\n"
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" --version Show package version\n"
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" --list Show pending password requests\n"
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" --query Process pending password requests\n"
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" --watch Continuously process password requests\n"
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" --wall Continuously forward password requests to wall\n"
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" --plymouth Ask question with Plymouth instead of on TTY\n"
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" --console Ask question on /dev/console instead of current TTY\n"
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"\nSee the %s for details.\n"
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, program_invocation_short_name
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, link
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);
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return 0;
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}
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static int parse_argv(int argc, char *argv[]) {
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enum {
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ARG_LIST = 0x100,
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ARG_QUERY,
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ARG_WATCH,
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ARG_WALL,
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ARG_PLYMOUTH,
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ARG_CONSOLE,
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ARG_VERSION
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};
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static const struct option options[] = {
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{ "help", no_argument, NULL, 'h' },
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{ "version", no_argument, NULL, ARG_VERSION },
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{ "list", no_argument, NULL, ARG_LIST },
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{ "query", no_argument, NULL, ARG_QUERY },
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{ "watch", no_argument, NULL, ARG_WATCH },
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{ "wall", no_argument, NULL, ARG_WALL },
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{ "plymouth", no_argument, NULL, ARG_PLYMOUTH },
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{ "console", optional_argument, NULL, ARG_CONSOLE },
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{}
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};
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int c;
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assert(argc >= 0);
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assert(argv);
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while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
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switch (c) {
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case 'h':
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return help();
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case ARG_VERSION:
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return version();
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case ARG_LIST:
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arg_action = ACTION_LIST;
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break;
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case ARG_QUERY:
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arg_action = ACTION_QUERY;
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break;
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case ARG_WATCH:
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arg_action = ACTION_WATCH;
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break;
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case ARG_WALL:
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arg_action = ACTION_WALL;
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break;
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case ARG_PLYMOUTH:
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arg_plymouth = true;
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break;
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case ARG_CONSOLE:
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arg_console = true;
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if (optarg) {
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if (isempty(optarg))
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
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"Empty console device path is not allowed.");
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arg_device = optarg;
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}
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break;
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case '?':
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return -EINVAL;
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default:
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assert_not_reached("Unhandled option");
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}
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if (optind != argc)
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
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"%s takes no arguments.", program_invocation_short_name);
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if (arg_plymouth || arg_console) {
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if (!IN_SET(arg_action, ACTION_QUERY, ACTION_WATCH))
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
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"Options --query and --watch conflict.");
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if (arg_plymouth && arg_console)
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
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"Options --plymouth and --console conflict.");
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}
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return 1;
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}
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/*
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* To be able to ask on all terminal devices of /dev/console the devices are collected. If more than one
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* device is found, then on each of the terminals a inquiring task is forked. Every task has its own session
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* and its own controlling terminal. If one of the tasks does handle a password, the remaining tasks will be
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* terminated.
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*/
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static int ask_on_this_console(const char *tty, pid_t *ret_pid, char **arguments) {
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static const struct sigaction sigchld = {
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.sa_handler = nop_signal_handler,
|
|
.sa_flags = SA_NOCLDSTOP | SA_RESTART,
|
|
};
|
|
static const struct sigaction sighup = {
|
|
.sa_handler = SIG_DFL,
|
|
.sa_flags = SA_RESTART,
|
|
};
|
|
int r;
|
|
|
|
assert_se(sigaction(SIGCHLD, &sigchld, NULL) >= 0);
|
|
assert_se(sigaction(SIGHUP, &sighup, NULL) >= 0);
|
|
assert_se(sigprocmask_many(SIG_UNBLOCK, NULL, SIGHUP, SIGCHLD, -1) >= 0);
|
|
|
|
r = safe_fork("(sd-passwd)", FORK_RESET_SIGNALS|FORK_LOG, ret_pid);
|
|
if (r < 0)
|
|
return r;
|
|
if (r == 0) {
|
|
char **i;
|
|
|
|
assert_se(prctl(PR_SET_PDEATHSIG, SIGHUP) >= 0);
|
|
|
|
STRV_FOREACH(i, arguments) {
|
|
char *k;
|
|
|
|
if (!streq(*i, "--console"))
|
|
continue;
|
|
|
|
k = strjoin("--console=", tty);
|
|
if (!k) {
|
|
log_oom();
|
|
_exit(EXIT_FAILURE);
|
|
}
|
|
|
|
free_and_replace(*i, k);
|
|
}
|
|
|
|
execv(SYSTEMD_TTY_ASK_PASSWORD_AGENT_BINARY_PATH, arguments);
|
|
_exit(EXIT_FAILURE);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void terminate_agents(Set *pids) {
|
|
struct timespec ts;
|
|
siginfo_t status = {};
|
|
sigset_t set;
|
|
void *p;
|
|
int r, signum;
|
|
|
|
/*
|
|
* Request termination of the remaining processes as those
|
|
* are not required anymore.
|
|
*/
|
|
SET_FOREACH(p, pids)
|
|
(void) kill(PTR_TO_PID(p), SIGTERM);
|
|
|
|
/*
|
|
* Collect the processes which have go away.
|
|
*/
|
|
assert_se(sigemptyset(&set) >= 0);
|
|
assert_se(sigaddset(&set, SIGCHLD) >= 0);
|
|
timespec_store(&ts, 50 * USEC_PER_MSEC);
|
|
|
|
while (!set_isempty(pids)) {
|
|
|
|
zero(status);
|
|
r = waitid(P_ALL, 0, &status, WEXITED|WNOHANG);
|
|
if (r < 0 && errno == EINTR)
|
|
continue;
|
|
|
|
if (r == 0 && status.si_pid > 0) {
|
|
set_remove(pids, PID_TO_PTR(status.si_pid));
|
|
continue;
|
|
}
|
|
|
|
signum = sigtimedwait(&set, NULL, &ts);
|
|
if (signum < 0) {
|
|
if (errno != EAGAIN)
|
|
log_error_errno(errno, "sigtimedwait() failed: %m");
|
|
break;
|
|
}
|
|
assert(signum == SIGCHLD);
|
|
}
|
|
|
|
/*
|
|
* Kill hanging processes.
|
|
*/
|
|
SET_FOREACH(p, pids) {
|
|
log_warning("Failed to terminate child %d, killing it", PTR_TO_PID(p));
|
|
(void) kill(PTR_TO_PID(p), SIGKILL);
|
|
}
|
|
}
|
|
|
|
static int ask_on_consoles(char *argv[]) {
|
|
_cleanup_set_free_ Set *pids = NULL;
|
|
_cleanup_strv_free_ char **consoles = NULL, **arguments = NULL;
|
|
siginfo_t status = {};
|
|
char **tty;
|
|
pid_t pid;
|
|
int r;
|
|
|
|
r = get_kernel_consoles(&consoles);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to determine devices of /dev/console: %m");
|
|
|
|
pids = set_new(NULL);
|
|
if (!pids)
|
|
return log_oom();
|
|
|
|
arguments = strv_copy(argv);
|
|
if (!arguments)
|
|
return log_oom();
|
|
|
|
/* Start an agent on each console. */
|
|
STRV_FOREACH(tty, consoles) {
|
|
r = ask_on_this_console(*tty, &pid, arguments);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (set_put(pids, PID_TO_PTR(pid)) < 0)
|
|
return log_oom();
|
|
}
|
|
|
|
/* Wait for an agent to exit. */
|
|
for (;;) {
|
|
zero(status);
|
|
|
|
if (waitid(P_ALL, 0, &status, WEXITED) < 0) {
|
|
if (errno == EINTR)
|
|
continue;
|
|
|
|
return log_error_errno(errno, "waitid() failed: %m");
|
|
}
|
|
|
|
set_remove(pids, PID_TO_PTR(status.si_pid));
|
|
break;
|
|
}
|
|
|
|
if (!is_clean_exit(status.si_code, status.si_status, EXIT_CLEAN_DAEMON, NULL))
|
|
log_error("Password agent failed with: %d", status.si_status);
|
|
|
|
terminate_agents(pids);
|
|
return 0;
|
|
}
|
|
|
|
static int run(int argc, char *argv[]) {
|
|
int r;
|
|
|
|
log_setup_service();
|
|
|
|
umask(0022);
|
|
|
|
r = parse_argv(argc, argv);
|
|
if (r <= 0)
|
|
return r;
|
|
|
|
if (arg_console && !arg_device)
|
|
/*
|
|
* Spawn a separate process for each console device.
|
|
*/
|
|
return ask_on_consoles(argv);
|
|
|
|
if (arg_device) {
|
|
/*
|
|
* Later on, a controlling terminal will be acquired,
|
|
* therefore the current process has to become a session
|
|
* leader and should not have a controlling terminal already.
|
|
*/
|
|
(void) setsid();
|
|
(void) release_terminal();
|
|
}
|
|
|
|
return process_and_watch_password_files(!IN_SET(arg_action, ACTION_QUERY, ACTION_LIST));
|
|
}
|
|
|
|
DEFINE_MAIN_FUNCTION(run);
|