791 lines
23 KiB
C
791 lines
23 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <errno.h>
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#include <fcntl.h>
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#include <inttypes.h>
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#include <limits.h>
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#include <poll.h>
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#include <signal.h>
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/inotify.h>
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#include <sys/signalfd.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <sys/uio.h>
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#include <sys/un.h>
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#include <termios.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 "fd-util.h"
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#include "fileio.h"
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#include "format-util.h"
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#include "io-util.h"
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#include "log.h"
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#include "macro.h"
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#include "missing.h"
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#include "mkdir.h"
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#include "process-util.h"
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#include "random-util.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 "time-util.h"
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#include "umask-util.h"
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#include "utf8.h"
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#include "util.h"
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#define KEYRING_TIMEOUT_USEC ((5 * USEC_PER_MINUTE) / 2)
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static int lookup_key(const char *keyname, key_serial_t *ret) {
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key_serial_t serial;
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assert(keyname);
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assert(ret);
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serial = request_key("user", keyname, NULL, 0);
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if (serial == -1)
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return negative_errno();
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*ret = serial;
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return 0;
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}
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static int retrieve_key(key_serial_t serial, char ***ret) {
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_cleanup_free_ char *p = NULL;
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long m = 100, n;
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char **l;
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assert(ret);
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for (;;) {
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p = new(char, m);
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if (!p)
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return -ENOMEM;
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n = keyctl(KEYCTL_READ, (unsigned long) serial, (unsigned long) p, (unsigned long) m, 0);
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if (n < 0)
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return -errno;
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if (n < m)
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break;
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explicit_bzero(p, n);
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free(p);
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m *= 2;
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}
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l = strv_parse_nulstr(p, n);
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if (!l)
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return -ENOMEM;
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explicit_bzero(p, n);
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*ret = l;
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return 0;
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}
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static int add_to_keyring(const char *keyname, AskPasswordFlags flags, char **passwords) {
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_cleanup_strv_free_erase_ char **l = NULL;
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_cleanup_free_ char *p = NULL;
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key_serial_t serial;
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size_t n;
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int r;
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assert(keyname);
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assert(passwords);
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if (!(flags & ASK_PASSWORD_PUSH_CACHE))
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return 0;
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r = lookup_key(keyname, &serial);
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if (r >= 0) {
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r = retrieve_key(serial, &l);
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if (r < 0)
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return r;
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} else if (r != -ENOKEY)
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return r;
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r = strv_extend_strv(&l, passwords, true);
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if (r <= 0)
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return r;
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r = strv_make_nulstr(l, &p, &n);
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if (r < 0)
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return r;
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serial = add_key("user", keyname, p, n, KEY_SPEC_USER_KEYRING);
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explicit_bzero(p, n);
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if (serial == -1)
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return -errno;
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if (keyctl(KEYCTL_SET_TIMEOUT,
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(unsigned long) serial,
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(unsigned long) DIV_ROUND_UP(KEYRING_TIMEOUT_USEC, USEC_PER_SEC), 0, 0) < 0)
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log_debug_errno(errno, "Failed to adjust timeout: %m");
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log_debug("Added key to keyring as %" PRIi32 ".", serial);
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return 1;
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}
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static int add_to_keyring_and_log(const char *keyname, AskPasswordFlags flags, char **passwords) {
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int r;
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assert(keyname);
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assert(passwords);
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r = add_to_keyring(keyname, flags, passwords);
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if (r < 0)
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return log_debug_errno(r, "Failed to add password to keyring: %m");
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return 0;
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}
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int ask_password_keyring(const char *keyname, AskPasswordFlags flags, char ***ret) {
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key_serial_t serial;
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int r;
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assert(keyname);
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assert(ret);
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if (!(flags & ASK_PASSWORD_ACCEPT_CACHED))
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return -EUNATCH;
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r = lookup_key(keyname, &serial);
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if (r == -ENOSYS) /* when retrieving the distinction doesn't matter */
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return -ENOKEY;
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if (r < 0)
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return r;
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return retrieve_key(serial, ret);
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}
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static void backspace_chars(int ttyfd, size_t p) {
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if (ttyfd < 0)
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return;
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while (p > 0) {
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p--;
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loop_write(ttyfd, "\b \b", 3, false);
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}
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}
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static void backspace_string(int ttyfd, const char *str) {
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size_t m;
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assert(str);
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if (ttyfd < 0)
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return;
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/* Backspaces through enough characters to entirely undo printing of the specified string. */
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m = utf8_n_codepoints(str);
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if (m == (size_t) -1)
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m = strlen(str); /* Not a valid UTF-8 string? If so, let's backspace the number of bytes output. Most
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* likely this happened because we are not in an UTF-8 locale, and in that case that
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* is the correct thing to do. And even if it's not, terminals tend to stop
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* backspacing at the leftmost column, hence backspacing too much should be mostly
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* OK. */
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backspace_chars(ttyfd, m);
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}
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int ask_password_tty(
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int ttyfd,
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const char *message,
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const char *keyname,
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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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enum {
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POLL_TTY,
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POLL_INOTIFY,
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_POLL_MAX,
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};
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bool reset_tty = false, dirty = false, use_color = false;
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_cleanup_close_ int cttyfd = -1, notify = -1;
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struct termios old_termios, new_termios;
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char passphrase[LINE_MAX + 1] = {}, *x;
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struct pollfd pollfd[_POLL_MAX];
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size_t p = 0, codepoint = 0;
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int r;
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assert(ret);
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if (flags & ASK_PASSWORD_NO_TTY)
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return -EUNATCH;
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if (!message)
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message = "Password:";
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if (flag_file) {
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notify = inotify_init1(IN_CLOEXEC|IN_NONBLOCK);
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if (notify < 0)
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return -errno;
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if (inotify_add_watch(notify, flag_file, IN_ATTRIB /* for the link count */) < 0)
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return -errno;
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}
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/* If the caller didn't specify a TTY, then use the controlling tty, if we can. */
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if (ttyfd < 0)
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ttyfd = cttyfd = open("/dev/tty", O_RDWR|O_NOCTTY|O_CLOEXEC);
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if (ttyfd >= 0) {
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if (tcgetattr(ttyfd, &old_termios) < 0)
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return -errno;
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if (flags & ASK_PASSWORD_CONSOLE_COLOR)
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use_color = dev_console_colors_enabled();
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else
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use_color = colors_enabled();
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if (use_color)
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(void) loop_write(ttyfd, ANSI_HIGHLIGHT, STRLEN(ANSI_HIGHLIGHT), false);
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(void) loop_write(ttyfd, message, strlen(message), false);
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(void) loop_write(ttyfd, " ", 1, false);
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if (use_color)
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(void) loop_write(ttyfd, ANSI_NORMAL, STRLEN(ANSI_NORMAL), false);
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new_termios = old_termios;
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new_termios.c_lflag &= ~(ICANON|ECHO);
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new_termios.c_cc[VMIN] = 1;
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new_termios.c_cc[VTIME] = 0;
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if (tcsetattr(ttyfd, TCSADRAIN, &new_termios) < 0) {
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r = -errno;
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goto finish;
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}
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reset_tty = true;
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}
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pollfd[POLL_TTY] = (struct pollfd) {
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.fd = ttyfd >= 0 ? ttyfd : STDIN_FILENO,
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.events = POLLIN,
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};
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pollfd[POLL_INOTIFY] = (struct pollfd) {
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.fd = notify,
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.events = POLLIN,
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};
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for (;;) {
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int sleep_for = -1, k;
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ssize_t n;
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char c;
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if (until > 0) {
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usec_t y;
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y = now(CLOCK_MONOTONIC);
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if (y > until) {
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r = -ETIME;
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goto finish;
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}
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sleep_for = (int) DIV_ROUND_UP(until - y, USEC_PER_MSEC);
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}
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if (flag_file)
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if (access(flag_file, F_OK) < 0) {
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r = -errno;
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goto finish;
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}
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k = poll(pollfd, notify >= 0 ? 2 : 1, sleep_for);
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if (k < 0) {
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if (errno == EINTR)
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continue;
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r = -errno;
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goto finish;
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} else if (k == 0) {
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r = -ETIME;
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goto finish;
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}
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if (notify >= 0 && pollfd[POLL_INOTIFY].revents != 0)
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(void) flush_fd(notify);
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if (pollfd[POLL_TTY].revents == 0)
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continue;
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n = read(ttyfd >= 0 ? ttyfd : STDIN_FILENO, &c, 1);
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if (n < 0) {
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if (IN_SET(errno, EINTR, EAGAIN))
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continue;
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r = -errno;
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goto finish;
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}
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/* We treat EOF, newline and NUL byte all as valid end markers */
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if (n == 0 || c == '\n' || c == 0)
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break;
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if (c == 21) { /* C-u */
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if (!(flags & ASK_PASSWORD_SILENT))
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backspace_string(ttyfd, passphrase);
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explicit_bzero(passphrase, sizeof(passphrase));
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p = codepoint = 0;
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} else if (IN_SET(c, '\b', 127)) {
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if (p > 0) {
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size_t q;
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if (!(flags & ASK_PASSWORD_SILENT))
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backspace_chars(ttyfd, 1);
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/* Remove a full UTF-8 codepoint from the end. For that, figure out where the last one
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* begins */
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q = 0;
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for (;;) {
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size_t z;
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z = utf8_encoded_valid_unichar(passphrase + q);
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if (z == 0) {
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q = (size_t) -1; /* Invalid UTF8! */
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break;
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}
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if (q + z >= p) /* This one brings us over the edge */
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break;
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q += z;
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}
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p = codepoint = q == (size_t) -1 ? p - 1 : q;
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explicit_bzero(passphrase + p, sizeof(passphrase) - p);
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} else if (!dirty && !(flags & ASK_PASSWORD_SILENT)) {
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flags |= ASK_PASSWORD_SILENT;
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/* There are two ways to enter silent mode. Either by pressing backspace as first key
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* (and only as first key), or ... */
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if (ttyfd >= 0)
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(void) loop_write(ttyfd, "(no echo) ", 10, false);
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} else if (ttyfd >= 0)
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(void) loop_write(ttyfd, "\a", 1, false);
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} else if (c == '\t' && !(flags & ASK_PASSWORD_SILENT)) {
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backspace_string(ttyfd, passphrase);
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flags |= ASK_PASSWORD_SILENT;
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/* ... or by pressing TAB at any time. */
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if (ttyfd >= 0)
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(void) loop_write(ttyfd, "(no echo) ", 10, false);
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} else if (p >= sizeof(passphrase)-1) {
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/* Reached the size limit */
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if (ttyfd >= 0)
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(void) loop_write(ttyfd, "\a", 1, false);
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} else {
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passphrase[p++] = c;
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if (!(flags & ASK_PASSWORD_SILENT) && ttyfd >= 0) {
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/* Check if we got a complete UTF-8 character now. If so, let's output one '*'. */
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n = utf8_encoded_valid_unichar(passphrase + codepoint);
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if (n >= 0) {
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codepoint = p;
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(void) loop_write(ttyfd, (flags & ASK_PASSWORD_ECHO) ? &c : "*", 1, false);
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}
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}
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dirty = true;
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}
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/* Let's forget this char, just to not keep needlessly copies of key material around */
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c = 'x';
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}
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x = strndup(passphrase, p);
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explicit_bzero(passphrase, sizeof(passphrase));
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if (!x) {
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r = -ENOMEM;
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goto finish;
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}
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if (keyname)
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(void) add_to_keyring_and_log(keyname, flags, STRV_MAKE(x));
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*ret = x;
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r = 0;
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finish:
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if (ttyfd >= 0 && reset_tty) {
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(void) loop_write(ttyfd, "\n", 1, false);
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(void) tcsetattr(ttyfd, TCSADRAIN, &old_termios);
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}
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return r;
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}
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static int create_socket(char **name) {
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union sockaddr_union sa = {
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.un.sun_family = AF_UNIX,
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};
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_cleanup_close_ int fd = -1;
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static const int one = 1;
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char *c;
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int r;
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assert(name);
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fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
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if (fd < 0)
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return -errno;
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snprintf(sa.un.sun_path, sizeof(sa.un.sun_path)-1, "/run/systemd/ask-password/sck.%" PRIx64, random_u64());
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RUN_WITH_UMASK(0177) {
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if (bind(fd, &sa.sa, SOCKADDR_UN_LEN(sa.un)) < 0)
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return -errno;
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}
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if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) < 0)
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return -errno;
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c = strdup(sa.un.sun_path);
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if (!c)
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return -ENOMEM;
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*name = c;
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r = fd;
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fd = -1;
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return r;
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}
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int ask_password_agent(
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const char *message,
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const char *icon,
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const char *id,
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const char *keyname,
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usec_t until,
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AskPasswordFlags flags,
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char ***ret) {
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enum {
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FD_SOCKET,
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FD_SIGNAL,
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_FD_MAX
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};
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_cleanup_close_ int socket_fd = -1, signal_fd = -1, fd = -1;
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char temp[] = "/run/systemd/ask-password/tmp.XXXXXX";
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char final[sizeof(temp)] = "";
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_cleanup_free_ char *socket_name = NULL;
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_cleanup_strv_free_ char **l = NULL;
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_cleanup_fclose_ FILE *f = NULL;
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struct pollfd pollfd[_FD_MAX];
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sigset_t mask, oldmask;
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int r;
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assert(ret);
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if (flags & ASK_PASSWORD_NO_AGENT)
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return -EUNATCH;
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assert_se(sigemptyset(&mask) >= 0);
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assert_se(sigset_add_many(&mask, SIGINT, SIGTERM, -1) >= 0);
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assert_se(sigprocmask(SIG_BLOCK, &mask, &oldmask) >= 0);
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(void) mkdir_p_label("/run/systemd/ask-password", 0755);
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fd = mkostemp_safe(temp);
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if (fd < 0) {
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r = fd;
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goto finish;
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}
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(void) fchmod(fd, 0644);
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f = fdopen(fd, "w");
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if (!f) {
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r = -errno;
|
|
goto finish;
|
|
}
|
|
|
|
fd = -1;
|
|
|
|
signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
|
|
if (signal_fd < 0) {
|
|
r = -errno;
|
|
goto finish;
|
|
}
|
|
|
|
socket_fd = create_socket(&socket_name);
|
|
if (socket_fd < 0) {
|
|
r = socket_fd;
|
|
goto finish;
|
|
}
|
|
|
|
fprintf(f,
|
|
"[Ask]\n"
|
|
"PID="PID_FMT"\n"
|
|
"Socket=%s\n"
|
|
"AcceptCached=%i\n"
|
|
"Echo=%i\n"
|
|
"NotAfter="USEC_FMT"\n",
|
|
getpid_cached(),
|
|
socket_name,
|
|
(flags & ASK_PASSWORD_ACCEPT_CACHED) ? 1 : 0,
|
|
(flags & ASK_PASSWORD_ECHO) ? 1 : 0,
|
|
until);
|
|
|
|
if (message)
|
|
fprintf(f, "Message=%s\n", message);
|
|
|
|
if (icon)
|
|
fprintf(f, "Icon=%s\n", icon);
|
|
|
|
if (id)
|
|
fprintf(f, "Id=%s\n", id);
|
|
|
|
r = fflush_and_check(f);
|
|
if (r < 0)
|
|
goto finish;
|
|
|
|
memcpy(final, temp, sizeof(temp));
|
|
|
|
final[sizeof(final)-11] = 'a';
|
|
final[sizeof(final)-10] = 's';
|
|
final[sizeof(final)-9] = 'k';
|
|
|
|
if (rename(temp, final) < 0) {
|
|
r = -errno;
|
|
goto finish;
|
|
}
|
|
|
|
zero(pollfd);
|
|
pollfd[FD_SOCKET].fd = socket_fd;
|
|
pollfd[FD_SOCKET].events = POLLIN;
|
|
pollfd[FD_SIGNAL].fd = signal_fd;
|
|
pollfd[FD_SIGNAL].events = POLLIN;
|
|
|
|
for (;;) {
|
|
char passphrase[LINE_MAX+1];
|
|
struct msghdr msghdr;
|
|
struct iovec iovec;
|
|
struct ucred *ucred;
|
|
union {
|
|
struct cmsghdr cmsghdr;
|
|
uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];
|
|
} control;
|
|
ssize_t n;
|
|
int k;
|
|
usec_t t;
|
|
|
|
t = now(CLOCK_MONOTONIC);
|
|
|
|
if (until > 0 && until <= t) {
|
|
r = -ETIME;
|
|
goto finish;
|
|
}
|
|
|
|
k = poll(pollfd, _FD_MAX, until > 0 ? (int) ((until-t)/USEC_PER_MSEC) : -1);
|
|
if (k < 0) {
|
|
if (errno == EINTR)
|
|
continue;
|
|
|
|
r = -errno;
|
|
goto finish;
|
|
}
|
|
|
|
if (k <= 0) {
|
|
r = -ETIME;
|
|
goto finish;
|
|
}
|
|
|
|
if (pollfd[FD_SIGNAL].revents & POLLIN) {
|
|
r = -EINTR;
|
|
goto finish;
|
|
}
|
|
|
|
if (pollfd[FD_SOCKET].revents != POLLIN) {
|
|
r = -EIO;
|
|
goto finish;
|
|
}
|
|
|
|
zero(iovec);
|
|
iovec.iov_base = passphrase;
|
|
iovec.iov_len = sizeof(passphrase);
|
|
|
|
zero(control);
|
|
zero(msghdr);
|
|
msghdr.msg_iov = &iovec;
|
|
msghdr.msg_iovlen = 1;
|
|
msghdr.msg_control = &control;
|
|
msghdr.msg_controllen = sizeof(control);
|
|
|
|
n = recvmsg(socket_fd, &msghdr, 0);
|
|
if (n < 0) {
|
|
if (IN_SET(errno, EAGAIN, EINTR))
|
|
continue;
|
|
|
|
r = -errno;
|
|
goto finish;
|
|
}
|
|
|
|
cmsg_close_all(&msghdr);
|
|
|
|
if (n <= 0) {
|
|
log_debug("Message too short");
|
|
continue;
|
|
}
|
|
|
|
if (msghdr.msg_controllen < CMSG_LEN(sizeof(struct ucred)) ||
|
|
control.cmsghdr.cmsg_level != SOL_SOCKET ||
|
|
control.cmsghdr.cmsg_type != SCM_CREDENTIALS ||
|
|
control.cmsghdr.cmsg_len != CMSG_LEN(sizeof(struct ucred))) {
|
|
log_debug("Received message without credentials. Ignoring.");
|
|
continue;
|
|
}
|
|
|
|
ucred = (struct ucred*) CMSG_DATA(&control.cmsghdr);
|
|
if (ucred->uid != 0) {
|
|
log_debug("Got request from unprivileged user. Ignoring.");
|
|
continue;
|
|
}
|
|
|
|
if (passphrase[0] == '+') {
|
|
/* An empty message refers to the empty password */
|
|
if (n == 1)
|
|
l = strv_new("", NULL);
|
|
else
|
|
l = strv_parse_nulstr(passphrase+1, n-1);
|
|
explicit_bzero(passphrase, n);
|
|
if (!l) {
|
|
r = -ENOMEM;
|
|
goto finish;
|
|
}
|
|
|
|
if (strv_isempty(l)) {
|
|
l = strv_free(l);
|
|
log_debug("Invalid packet");
|
|
continue;
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
if (passphrase[0] == '-') {
|
|
r = -ECANCELED;
|
|
goto finish;
|
|
}
|
|
|
|
log_debug("Invalid packet");
|
|
}
|
|
|
|
if (keyname)
|
|
(void) add_to_keyring_and_log(keyname, flags, l);
|
|
|
|
*ret = TAKE_PTR(l);
|
|
r = 0;
|
|
|
|
finish:
|
|
if (socket_name)
|
|
(void) unlink(socket_name);
|
|
|
|
(void) unlink(temp);
|
|
|
|
if (final[0])
|
|
(void) unlink(final);
|
|
|
|
assert_se(sigprocmask(SIG_SETMASK, &oldmask, NULL) == 0);
|
|
return r;
|
|
}
|
|
|
|
int ask_password_auto(
|
|
const char *message,
|
|
const char *icon,
|
|
const char *id,
|
|
const char *keyname,
|
|
usec_t until,
|
|
AskPasswordFlags flags,
|
|
char ***ret) {
|
|
|
|
int r;
|
|
|
|
assert(ret);
|
|
|
|
if ((flags & ASK_PASSWORD_ACCEPT_CACHED) && keyname) {
|
|
r = ask_password_keyring(keyname, flags, ret);
|
|
if (r != -ENOKEY)
|
|
return r;
|
|
}
|
|
|
|
if (!(flags & ASK_PASSWORD_NO_TTY) && isatty(STDIN_FILENO)) {
|
|
char *s = NULL, **l = NULL;
|
|
|
|
r = ask_password_tty(-1, message, keyname, until, flags, NULL, &s);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = strv_push(&l, s);
|
|
if (r < 0) {
|
|
string_erase(s);
|
|
free(s);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
*ret = l;
|
|
return 0;
|
|
}
|
|
|
|
if (!(flags & ASK_PASSWORD_NO_AGENT))
|
|
return ask_password_agent(message, icon, id, keyname, until, flags, ret);
|
|
|
|
return -EUNATCH;
|
|
}
|