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>
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 if ((fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0)) < 0) {
259 log_error("socket() failed: %m");
264 sa.un.sun_family = AF_UNIX;
265 snprintf(sa.un.sun_path, sizeof(sa.un.sun_path)-1, "/run/systemd/ask-password/sck.%llu", random_ull());
268 r = bind(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path));
273 log_error("bind() failed: %m");
277 if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) < 0) {
279 log_error("SO_PASSCRED failed: %m");
283 if (!(c = strdup(sa.un.sun_path))) {
285 log_error("Out of memory");
293 close_nointr_nofail(fd);
298 int ask_password_agent(
303 char ***_passphrases) {
311 char temp[] = "/run/systemd/ask-password/tmp.XXXXXX";
312 char final[sizeof(temp)] = "";
315 char *socket_name = NULL;
316 int socket_fd = -1, signal_fd = -1;
317 sigset_t mask, oldmask;
318 struct pollfd pollfd[_FD_MAX];
321 assert(_passphrases);
323 assert_se(sigemptyset(&mask) == 0);
324 sigset_add_many(&mask, SIGINT, SIGTERM, -1);
325 assert_se(sigprocmask(SIG_BLOCK, &mask, &oldmask) == 0);
327 mkdir_p("/run/systemd/ask-password", 0755);
330 fd = mkostemp(temp, O_CLOEXEC|O_CREAT|O_WRONLY);
334 log_error("Failed to create password file: %m");
341 if (!(f = fdopen(fd, "w"))) {
342 log_error("Failed to allocate FILE: %m");
349 if ((signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC)) < 0) {
350 log_error("signalfd(): %m");
355 if ((socket_fd = create_socket(&socket_name)) < 0) {
366 (unsigned long) getpid(),
368 accept_cached ? 1 : 0,
369 (unsigned long long) until);
372 fprintf(f, "Message=%s\n", message);
375 fprintf(f, "Icon=%s\n", icon);
380 log_error("Failed to write query file: %m");
385 memcpy(final, temp, sizeof(temp));
387 final[sizeof(final)-11] = 'a';
388 final[sizeof(final)-10] = 's';
389 final[sizeof(final)-9] = 'k';
391 if (rename(temp, final) < 0) {
392 log_error("Failed to rename query file: %m");
398 pollfd[FD_SOCKET].fd = socket_fd;
399 pollfd[FD_SOCKET].events = POLLIN;
400 pollfd[FD_SIGNAL].fd = signal_fd;
401 pollfd[FD_SIGNAL].events = POLLIN;
404 char passphrase[LINE_MAX+1];
405 struct msghdr msghdr;
409 struct cmsghdr cmsghdr;
410 uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];
416 t = now(CLOCK_MONOTONIC);
418 if (until > 0 && until <= t) {
419 log_notice("Timed out");
424 if ((k = poll(pollfd, _FD_MAX, until > 0 ? (int) ((until-t)/USEC_PER_MSEC) : -1)) < 0) {
429 log_error("poll() failed: %m");
435 log_notice("Timed out");
440 if (pollfd[FD_SIGNAL].revents & POLLIN) {
445 if (pollfd[FD_SOCKET].revents != POLLIN) {
446 log_error("Unexpected poll() event.");
452 iovec.iov_base = passphrase;
453 iovec.iov_len = sizeof(passphrase);
457 msghdr.msg_iov = &iovec;
458 msghdr.msg_iovlen = 1;
459 msghdr.msg_control = &control;
460 msghdr.msg_controllen = sizeof(control);
462 if ((n = recvmsg(socket_fd, &msghdr, 0)) < 0) {
464 if (errno == EAGAIN ||
468 log_error("recvmsg() failed: %m");
474 log_error("Message too short");
478 if (msghdr.msg_controllen < CMSG_LEN(sizeof(struct ucred)) ||
479 control.cmsghdr.cmsg_level != SOL_SOCKET ||
480 control.cmsghdr.cmsg_type != SCM_CREDENTIALS ||
481 control.cmsghdr.cmsg_len != CMSG_LEN(sizeof(struct ucred))) {
482 log_warning("Received message without credentials. Ignoring.");
486 ucred = (struct ucred*) CMSG_DATA(&control.cmsghdr);
487 if (ucred->uid != 0) {
488 log_warning("Got request from unprivileged user. Ignoring.");
492 if (passphrase[0] == '+') {
496 l = strv_new("", NULL);
498 l = strv_parse_nulstr(passphrase+1, n-1);
499 /* An empty message refers to the empty password */
506 if (strv_length(l) <= 0) {
508 log_error("Invalid packet");
514 } else if (passphrase[0] == '-') {
518 log_error("Invalid packet");
529 close_nointr_nofail(fd);
537 close_nointr_nofail(socket_fd);
540 close_nointr_nofail(signal_fd);
550 assert_se(sigprocmask(SIG_SETMASK, &oldmask, NULL) == 0);
555 int ask_password_auto(const char *message, const char *icon, usec_t until, bool accept_cached, char ***_passphrases) {
557 assert(_passphrases);
559 if (isatty(STDIN_FILENO)) {
561 char *s = NULL, **l = NULL;
563 if ((r = ask_password_tty(message, until, NULL, &s)) < 0)
566 l = strv_new(s, NULL);
576 return ask_password_agent(message, icon, until, accept_cached, _passphrases);