1 /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
4 This file is part of systemd.
6 Copyright 2010 Lennart Poettering
8 systemd is free software; you can redistribute it and/or modify it
9 under the terms of the GNU Lesser General Public License as published by
10 the Free Software Foundation; either version 2.1 of the License, or
11 (at your option) any later version.
13 systemd is distributed in the hope that it will be useful, but
14 WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 Lesser General Public License for more details.
18 You should have received a copy of the GNU Lesser General Public License
19 along with systemd; If not, see <http://www.gnu.org/licenses/>.
25 #include <sys/inotify.h>
28 #include <sys/socket.h>
32 #include <sys/signalfd.h>
38 #include "ask-password-api.h"
40 static void backspace_chars(int ttyfd, size_t p) {
48 loop_write(ttyfd, "\b \b", 3, false);
55 const char *flag_file,
58 struct termios old_termios, new_termios;
59 char passphrase[LINE_MAX];
61 int r, ttyfd = -1, notify = -1;
62 struct pollfd pollfd[2];
63 bool reset_tty = false;
64 bool silent_mode = false;
75 if ((notify = inotify_init1(IN_CLOEXEC|IN_NONBLOCK)) < 0) {
80 if (inotify_add_watch(notify, flag_file, IN_ATTRIB /* for the link count */) < 0) {
86 if ((ttyfd = open("/dev/tty", O_RDWR|O_NOCTTY|O_CLOEXEC)) >= 0) {
88 if (tcgetattr(ttyfd, &old_termios) < 0) {
93 loop_write(ttyfd, ANSI_HIGHLIGHT_ON, sizeof(ANSI_HIGHLIGHT_ON)-1, false);
94 loop_write(ttyfd, message, strlen(message), false);
95 loop_write(ttyfd, " ", 1, false);
96 loop_write(ttyfd, ANSI_HIGHLIGHT_OFF, sizeof(ANSI_HIGHLIGHT_OFF)-1, false);
98 new_termios = old_termios;
99 new_termios.c_lflag &= ~(ICANON|ECHO);
100 new_termios.c_cc[VMIN] = 1;
101 new_termios.c_cc[VTIME] = 0;
103 if (tcsetattr(ttyfd, TCSADRAIN, &new_termios) < 0) {
113 pollfd[POLL_TTY].fd = ttyfd >= 0 ? ttyfd : STDIN_FILENO;
114 pollfd[POLL_TTY].events = POLLIN;
115 pollfd[POLL_INOTIFY].fd = notify;
116 pollfd[POLL_INOTIFY].events = POLLIN;
120 int sleep_for = -1, k;
126 y = now(CLOCK_MONOTONIC);
133 sleep_for = (int) ((until - y) / USEC_PER_MSEC);
137 if (access(flag_file, F_OK) < 0) {
142 if ((k = poll(pollfd, notify > 0 ? 2 : 1, sleep_for)) < 0) {
154 if (notify > 0 && pollfd[POLL_INOTIFY].revents != 0)
157 if (pollfd[POLL_TTY].revents == 0)
160 if ((n = read(ttyfd >= 0 ? ttyfd : STDIN_FILENO, &c, 1)) < 0) {
162 if (errno == EINTR || errno == EAGAIN)
173 else if (c == 21) { /* C-u */
176 backspace_chars(ttyfd, p);
179 } else if (c == '\b' || c == 127) {
184 backspace_chars(ttyfd, 1);
187 } else if (!dirty && !silent_mode) {
191 /* There are two ways to enter silent
192 * mode. Either by pressing backspace
193 * as first key (and only as first key),
196 loop_write(ttyfd, "(no echo) ", 10, false);
198 } else if (ttyfd >= 0)
199 loop_write(ttyfd, "\a", 1, false);
201 } else if (c == '\t' && !silent_mode) {
203 backspace_chars(ttyfd, p);
206 /* ... or by pressing TAB at any time. */
209 loop_write(ttyfd, "(no echo) ", 10, false);
213 if (!silent_mode && ttyfd >= 0)
214 loop_write(ttyfd, "*", 1, false);
222 if (!(*_passphrase = strdup(passphrase))) {
231 close_nointr_nofail(notify);
236 loop_write(ttyfd, "\n", 1, false);
237 tcsetattr(ttyfd, TCSADRAIN, &old_termios);
240 close_nointr_nofail(ttyfd);
246 static int create_socket(char **name) {
250 struct sockaddr_un un;
258 fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
260 log_error("socket() failed: %m");
265 sa.un.sun_family = AF_UNIX;
266 snprintf(sa.un.sun_path, sizeof(sa.un.sun_path)-1, "/run/systemd/ask-password/sck.%llu", random_ull());
269 r = bind(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path));
274 log_error("bind() failed: %m");
278 if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) < 0) {
280 log_error("SO_PASSCRED failed: %m");
284 c = strdup(sa.un.sun_path);
294 close_nointr_nofail(fd);
299 int ask_password_agent(
304 char ***_passphrases) {
312 char temp[] = "/run/systemd/ask-password/tmp.XXXXXX";
313 char final[sizeof(temp)] = "";
316 char *socket_name = NULL;
317 int socket_fd = -1, signal_fd = -1;
318 sigset_t mask, oldmask;
319 struct pollfd pollfd[_FD_MAX];
322 assert(_passphrases);
324 assert_se(sigemptyset(&mask) == 0);
325 sigset_add_many(&mask, SIGINT, SIGTERM, -1);
326 assert_se(sigprocmask(SIG_BLOCK, &mask, &oldmask) == 0);
328 mkdir_p_label("/run/systemd/ask-password", 0755);
331 fd = mkostemp(temp, O_CLOEXEC|O_CREAT|O_WRONLY);
335 log_error("Failed to create password file: %m");
342 if (!(f = fdopen(fd, "w"))) {
343 log_error("Failed to allocate FILE: %m");
350 if ((signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC)) < 0) {
351 log_error("signalfd(): %m");
356 if ((socket_fd = create_socket(&socket_name)) < 0) {
367 (unsigned long) getpid(),
369 accept_cached ? 1 : 0,
370 (unsigned long long) until);
373 fprintf(f, "Message=%s\n", message);
376 fprintf(f, "Icon=%s\n", icon);
381 log_error("Failed to write query file: %m");
386 memcpy(final, temp, sizeof(temp));
388 final[sizeof(final)-11] = 'a';
389 final[sizeof(final)-10] = 's';
390 final[sizeof(final)-9] = 'k';
392 if (rename(temp, final) < 0) {
393 log_error("Failed to rename query file: %m");
399 pollfd[FD_SOCKET].fd = socket_fd;
400 pollfd[FD_SOCKET].events = POLLIN;
401 pollfd[FD_SIGNAL].fd = signal_fd;
402 pollfd[FD_SIGNAL].events = POLLIN;
405 char passphrase[LINE_MAX+1];
406 struct msghdr msghdr;
410 struct cmsghdr cmsghdr;
411 uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];
417 t = now(CLOCK_MONOTONIC);
419 if (until > 0 && until <= t) {
420 log_notice("Timed out");
425 if ((k = poll(pollfd, _FD_MAX, until > 0 ? (int) ((until-t)/USEC_PER_MSEC) : -1)) < 0) {
430 log_error("poll() failed: %m");
436 log_notice("Timed out");
441 if (pollfd[FD_SIGNAL].revents & POLLIN) {
446 if (pollfd[FD_SOCKET].revents != POLLIN) {
447 log_error("Unexpected poll() event.");
453 iovec.iov_base = passphrase;
454 iovec.iov_len = sizeof(passphrase);
458 msghdr.msg_iov = &iovec;
459 msghdr.msg_iovlen = 1;
460 msghdr.msg_control = &control;
461 msghdr.msg_controllen = sizeof(control);
463 if ((n = recvmsg(socket_fd, &msghdr, 0)) < 0) {
465 if (errno == EAGAIN ||
469 log_error("recvmsg() failed: %m");
475 log_error("Message too short");
479 if (msghdr.msg_controllen < CMSG_LEN(sizeof(struct ucred)) ||
480 control.cmsghdr.cmsg_level != SOL_SOCKET ||
481 control.cmsghdr.cmsg_type != SCM_CREDENTIALS ||
482 control.cmsghdr.cmsg_len != CMSG_LEN(sizeof(struct ucred))) {
483 log_warning("Received message without credentials. Ignoring.");
487 ucred = (struct ucred*) CMSG_DATA(&control.cmsghdr);
488 if (ucred->uid != 0) {
489 log_warning("Got request from unprivileged user. Ignoring.");
493 if (passphrase[0] == '+') {
497 l = strv_new("", NULL);
499 l = strv_parse_nulstr(passphrase+1, n-1);
500 /* An empty message refers to the empty password */
507 if (strv_length(l) <= 0) {
509 log_error("Invalid packet");
515 } else if (passphrase[0] == '-') {
519 log_error("Invalid packet");
530 close_nointr_nofail(fd);
538 close_nointr_nofail(socket_fd);
541 close_nointr_nofail(signal_fd);
551 assert_se(sigprocmask(SIG_SETMASK, &oldmask, NULL) == 0);
556 int ask_password_auto(const char *message, const char *icon, usec_t until, bool accept_cached, char ***_passphrases) {
558 assert(_passphrases);
560 if (isatty(STDIN_FILENO)) {
562 char *s = NULL, **l = NULL;
564 if ((r = ask_password_tty(message, until, NULL, &s)) < 0)
567 l = strv_new(s, NULL);
577 return ask_password_agent(message, icon, until, accept_cached, _passphrases);