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 General Public License as published by
10 the Free Software Foundation; either version 2 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 General Public License for more details.
18 You should have received a copy of the GNU 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>
36 #include "ask-password-api.h"
41 const char *flag_file,
44 struct termios old_termios, new_termios;
45 char passphrase[LINE_MAX];
47 int r, ttyfd = -1, notify = -1;
48 struct pollfd pollfd[2];
49 bool reset_tty = false;
59 if ((notify = inotify_init1(IN_CLOEXEC|IN_NONBLOCK)) < 0) {
64 if (inotify_add_watch(notify, flag_file, IN_ATTRIB /* for the link count */) < 0) {
70 if ((ttyfd = open("/dev/tty", O_RDWR|O_NOCTTY|O_CLOEXEC)) >= 0) {
72 if (tcgetattr(ttyfd, &old_termios) < 0) {
77 loop_write(ttyfd, "\x1B[1m", 4, false);
78 loop_write(ttyfd, message, strlen(message), false);
79 loop_write(ttyfd, " ", 1, false);
80 loop_write(ttyfd, "\x1B[0m", 4, false);
82 new_termios = old_termios;
83 new_termios.c_lflag &= ~(ICANON|ECHO);
84 new_termios.c_cc[VMIN] = 1;
85 new_termios.c_cc[VTIME] = 0;
87 if (tcsetattr(ttyfd, TCSADRAIN, &new_termios) < 0) {
97 pollfd[POLL_TTY].fd = ttyfd >= 0 ? ttyfd : STDIN_FILENO;
98 pollfd[POLL_TTY].events = POLLIN;
99 pollfd[POLL_INOTIFY].fd = notify;
100 pollfd[POLL_INOTIFY].events = POLLIN;
104 int sleep_for = -1, k;
110 y = now(CLOCK_MONOTONIC);
117 sleep_for = (int) ((until - y) / USEC_PER_MSEC);
121 if (access(flag_file, F_OK) < 0) {
126 if ((k = poll(pollfd, notify > 0 ? 2 : 1, sleep_for)) < 0) {
138 if (notify > 0 && pollfd[POLL_INOTIFY].revents != 0)
141 if (pollfd[POLL_TTY].revents == 0)
144 if ((n = read(ttyfd >= 0 ? ttyfd : STDIN_FILENO, &c, 1)) < 0) {
146 if (errno == EINTR || errno == EAGAIN)
163 loop_write(ttyfd, "\b \b", 3, false);
166 } else if (c == '\b' || c == 127) {
171 loop_write(ttyfd, "\b \b", 3, false);
177 loop_write(ttyfd, "*", 1, false);
182 loop_write(ttyfd, "\n", 1, false);
186 if (!(*_passphrase = strdup(passphrase))) {
195 close_nointr_nofail(notify);
199 tcsetattr(ttyfd, TCSADRAIN, &old_termios);
201 close_nointr_nofail(ttyfd);
207 static int create_socket(char **name) {
211 struct sockaddr_un un;
218 if ((fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0)) < 0) {
219 log_error("socket() failed: %m");
224 sa.un.sun_family = AF_UNIX;
225 snprintf(sa.un.sun_path, sizeof(sa.un.sun_path)-1, "/dev/.systemd/ask-password/sck.%llu", random_ull());
227 if (bind(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path)) < 0) {
229 log_error("bind() failed: %m");
233 if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) < 0) {
235 log_error("SO_PASSCRED failed: %m");
239 if (!(c = strdup(sa.un.sun_path))) {
241 log_error("Out of memory");
249 close_nointr_nofail(fd);
255 int ask_password_agent(
259 char **_passphrase) {
267 char temp[] = "/dev/.systemd/ask-password/tmp.XXXXXX";
268 char final[sizeof(temp)] = "";
271 char *socket_name = NULL;
272 int socket_fd = -1, signal_fd = -1;
274 struct pollfd pollfd[_FD_MAX];
276 mkdir_p("/dev/.systemd/ask-password", 0755);
278 if ((fd = mkostemp(temp, O_CLOEXEC|O_CREAT|O_WRONLY)) < 0) {
279 log_error("Failed to create password file: %m");
286 if (!(f = fdopen(fd, "w"))) {
287 log_error("Failed to allocate FILE: %m");
294 assert_se(sigemptyset(&mask) == 0);
295 sigset_add_many(&mask, SIGINT, SIGTERM, -1);
296 assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
298 if ((signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC)) < 0) {
299 log_error("signalfd(): %m");
304 if ((socket_fd = create_socket(&socket_name)) < 0) {
314 (unsigned long) getpid(),
316 (unsigned long long) until);
319 fprintf(f, "Message=%s\n", message);
322 fprintf(f, "Icon=%s\n", icon);
327 log_error("Failed to write query file: %m");
332 memcpy(final, temp, sizeof(temp));
334 final[sizeof(final)-11] = 'a';
335 final[sizeof(final)-10] = 's';
336 final[sizeof(final)-9] = 'k';
338 if (rename(temp, final) < 0) {
339 log_error("Failed to rename query file: %m");
345 pollfd[FD_SOCKET].fd = socket_fd;
346 pollfd[FD_SOCKET].events = POLLIN;
347 pollfd[FD_SIGNAL].fd = signal_fd;
348 pollfd[FD_SIGNAL].events = POLLIN;
351 char passphrase[LINE_MAX+1];
352 struct msghdr msghdr;
356 struct cmsghdr cmsghdr;
357 uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];
363 t = now(CLOCK_MONOTONIC);
366 log_notice("Timed out");
371 if ((k = poll(pollfd, _FD_MAX, until-t/USEC_PER_MSEC)) < 0) {
376 log_error("poll() failed: %m");
382 log_notice("Timed out");
387 if (pollfd[FD_SIGNAL].revents & POLLIN)
390 if (pollfd[FD_SOCKET].revents != POLLIN) {
391 log_error("Unexpected poll() event.");
397 iovec.iov_base = passphrase;
398 iovec.iov_len = sizeof(passphrase)-1;
402 msghdr.msg_iov = &iovec;
403 msghdr.msg_iovlen = 1;
404 msghdr.msg_control = &control;
405 msghdr.msg_controllen = sizeof(control);
407 if ((n = recvmsg(socket_fd, &msghdr, 0)) < 0) {
409 if (errno == EAGAIN ||
413 log_error("recvmsg() failed: %m");
419 log_error("Message too short");
423 if (msghdr.msg_controllen < CMSG_LEN(sizeof(struct ucred)) ||
424 control.cmsghdr.cmsg_level != SOL_SOCKET ||
425 control.cmsghdr.cmsg_type != SCM_CREDENTIALS ||
426 control.cmsghdr.cmsg_len != CMSG_LEN(sizeof(struct ucred))) {
427 log_warning("Received message without credentials. Ignoring.");
431 ucred = (struct ucred*) CMSG_DATA(&control.cmsghdr);
432 if (ucred->uid != 0) {
433 log_warning("Got request from unprivileged user. Ignoring.");
437 if (passphrase[0] == '+') {
440 if (!(*_passphrase = strdup(passphrase+1))) {
445 } else if (passphrase[0] == '-') {
449 log_error("Invalid packet");
460 close_nointr_nofail(fd);
468 close_nointr_nofail(socket_fd);
471 close_nointr_nofail(signal_fd);
484 int ask_password_auto(const char *message, const char *icon, usec_t until, char **_passphrase) {
488 if (isatty(STDIN_FILENO))
489 return ask_password_tty(message, until, NULL, _passphrase);
491 return ask_password_agent(message, icon, until, _passphrase);