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) {
112 pollfd[POLL_TTY].fd = ttyfd >= 0 ? ttyfd : STDIN_FILENO;
113 pollfd[POLL_TTY].events = POLLIN;
114 pollfd[POLL_INOTIFY].fd = notify;
115 pollfd[POLL_INOTIFY].events = POLLIN;
119 int sleep_for = -1, k;
125 y = now(CLOCK_MONOTONIC);
132 sleep_for = (int) ((until - y) / USEC_PER_MSEC);
136 if (access(flag_file, F_OK) < 0) {
141 if ((k = poll(pollfd, notify > 0 ? 2 : 1, sleep_for)) < 0) {
153 if (notify > 0 && pollfd[POLL_INOTIFY].revents != 0)
156 if (pollfd[POLL_TTY].revents == 0)
159 if ((n = read(ttyfd >= 0 ? ttyfd : STDIN_FILENO, &c, 1)) < 0) {
161 if (errno == EINTR || errno == EAGAIN)
172 else if (c == 21) { /* C-u */
175 backspace_chars(ttyfd, p);
178 } else if (c == '\b' || c == 127) {
183 backspace_chars(ttyfd, 1);
186 } else if (!dirty && !silent_mode) {
190 /* There are two ways to enter silent
191 * mode. Either by pressing backspace
192 * as first key (and only as first key),
195 loop_write(ttyfd, "(no echo) ", 10, false);
197 } else if (ttyfd >= 0)
198 loop_write(ttyfd, "\a", 1, false);
200 } else if (c == '\t' && !silent_mode) {
202 backspace_chars(ttyfd, p);
205 /* ... or by pressing TAB at any time. */
208 loop_write(ttyfd, "(no echo) ", 10, false);
212 if (!silent_mode && ttyfd >= 0)
213 loop_write(ttyfd, "*", 1, false);
221 if (!(*_passphrase = strdup(passphrase))) {
234 loop_write(ttyfd, "\n", 1, false);
235 tcsetattr(ttyfd, TCSADRAIN, &old_termios);
244 static int create_socket(char **name) {
248 struct sockaddr_un un;
250 .un.sun_family = AF_UNIX,
258 fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
260 log_error("socket() failed: %m");
264 snprintf(sa.un.sun_path, sizeof(sa.un.sun_path)-1, "/run/systemd/ask-password/sck.%" PRIx64, random_u64());
266 RUN_WITH_UMASK(0177) {
267 r = bind(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path));
272 log_error("bind() failed: %m");
276 if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) < 0) {
278 log_error("SO_PASSCRED failed: %m");
282 c = strdup(sa.un.sun_path);
297 int ask_password_agent(
302 char ***_passphrases) {
310 char temp[] = "/run/systemd/ask-password/tmp.XXXXXX";
311 char final[sizeof(temp)] = "";
314 char *socket_name = NULL;
315 int socket_fd = -1, signal_fd = -1;
316 sigset_t mask, oldmask;
317 struct pollfd pollfd[_FD_MAX];
319 assert(_passphrases);
321 assert_se(sigemptyset(&mask) == 0);
322 sigset_add_many(&mask, SIGINT, SIGTERM, -1);
323 assert_se(sigprocmask(SIG_BLOCK, &mask, &oldmask) == 0);
325 mkdir_p_label("/run/systemd/ask-password", 0755);
327 fd = mkostemp_safe(temp, O_WRONLY|O_CLOEXEC);
329 log_error("Failed to create password file: %m");
336 if (!(f = fdopen(fd, "w"))) {
337 log_error("Failed to allocate FILE: %m");
344 if ((signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC)) < 0) {
345 log_error("signalfd(): %m");
350 if ((socket_fd = create_socket(&socket_name)) < 0) {
361 (unsigned long) getpid(),
363 accept_cached ? 1 : 0,
364 (unsigned long long) until);
367 fprintf(f, "Message=%s\n", message);
370 fprintf(f, "Icon=%s\n", icon);
375 log_error("Failed to write query file: %m");
380 memcpy(final, temp, sizeof(temp));
382 final[sizeof(final)-11] = 'a';
383 final[sizeof(final)-10] = 's';
384 final[sizeof(final)-9] = 'k';
386 if (rename(temp, final) < 0) {
387 log_error("Failed to rename query file: %m");
393 pollfd[FD_SOCKET].fd = socket_fd;
394 pollfd[FD_SOCKET].events = POLLIN;
395 pollfd[FD_SIGNAL].fd = signal_fd;
396 pollfd[FD_SIGNAL].events = POLLIN;
399 char passphrase[LINE_MAX+1];
400 struct msghdr msghdr;
404 struct cmsghdr cmsghdr;
405 uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];
411 t = now(CLOCK_MONOTONIC);
413 if (until > 0 && until <= t) {
414 log_notice("Timed out");
419 if ((k = poll(pollfd, _FD_MAX, until > 0 ? (int) ((until-t)/USEC_PER_MSEC) : -1)) < 0) {
424 log_error("poll() failed: %m");
430 log_notice("Timed out");
435 if (pollfd[FD_SIGNAL].revents & POLLIN) {
440 if (pollfd[FD_SOCKET].revents != POLLIN) {
441 log_error("Unexpected poll() event.");
447 iovec.iov_base = passphrase;
448 iovec.iov_len = sizeof(passphrase);
452 msghdr.msg_iov = &iovec;
453 msghdr.msg_iovlen = 1;
454 msghdr.msg_control = &control;
455 msghdr.msg_controllen = sizeof(control);
457 if ((n = recvmsg(socket_fd, &msghdr, 0)) < 0) {
459 if (errno == EAGAIN ||
463 log_error("recvmsg() failed: %m");
469 log_error("Message too short");
473 if (msghdr.msg_controllen < CMSG_LEN(sizeof(struct ucred)) ||
474 control.cmsghdr.cmsg_level != SOL_SOCKET ||
475 control.cmsghdr.cmsg_type != SCM_CREDENTIALS ||
476 control.cmsghdr.cmsg_len != CMSG_LEN(sizeof(struct ucred))) {
477 log_warning("Received message without credentials. Ignoring.");
481 ucred = (struct ucred*) CMSG_DATA(&control.cmsghdr);
482 if (ucred->uid != 0) {
483 log_warning("Got request from unprivileged user. Ignoring.");
487 if (passphrase[0] == '+') {
491 l = strv_new("", NULL);
493 l = strv_parse_nulstr(passphrase+1, n-1);
494 /* An empty message refers to the empty password */
501 if (strv_length(l) <= 0) {
503 log_error("Invalid packet");
509 } else if (passphrase[0] == '-') {
513 log_error("Invalid packet");
530 safe_close(socket_fd);
531 safe_close(signal_fd);
541 assert_se(sigprocmask(SIG_SETMASK, &oldmask, NULL) == 0);
546 int ask_password_auto(const char *message, const char *icon, usec_t until, bool accept_cached, char ***_passphrases) {
548 assert(_passphrases);
550 if (isatty(STDIN_FILENO)) {
552 char *s = NULL, **l = NULL;
554 if ((r = ask_password_tty(message, until, NULL, &s)) < 0)
557 l = strv_new(s, NULL);
567 return ask_password_agent(message, icon, until, accept_cached, _passphrases);