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], *x;
62 _cleanup_close_ int ttyfd = -1, notify = -1;
63 struct pollfd pollfd[2];
64 bool reset_tty = false;
65 bool silent_mode = false;
76 notify = inotify_init1(IN_CLOEXEC|IN_NONBLOCK);
82 if (inotify_add_watch(notify, flag_file, IN_ATTRIB /* for the link count */) < 0) {
88 ttyfd = open("/dev/tty", O_RDWR|O_NOCTTY|O_CLOEXEC);
91 if (tcgetattr(ttyfd, &old_termios) < 0) {
96 loop_write(ttyfd, ANSI_HIGHLIGHT_ON, sizeof(ANSI_HIGHLIGHT_ON)-1, false);
97 loop_write(ttyfd, message, strlen(message), false);
98 loop_write(ttyfd, " ", 1, false);
99 loop_write(ttyfd, ANSI_HIGHLIGHT_OFF, sizeof(ANSI_HIGHLIGHT_OFF)-1, false);
101 new_termios = old_termios;
102 new_termios.c_lflag &= ~(ICANON|ECHO);
103 new_termios.c_cc[VMIN] = 1;
104 new_termios.c_cc[VTIME] = 0;
106 if (tcsetattr(ttyfd, TCSADRAIN, &new_termios) < 0) {
115 pollfd[POLL_TTY].fd = ttyfd >= 0 ? ttyfd : STDIN_FILENO;
116 pollfd[POLL_TTY].events = POLLIN;
117 pollfd[POLL_INOTIFY].fd = notify;
118 pollfd[POLL_INOTIFY].events = POLLIN;
122 int sleep_for = -1, k;
128 y = now(CLOCK_MONOTONIC);
135 sleep_for = (int) ((until - y) / USEC_PER_MSEC);
139 if (access(flag_file, F_OK) < 0) {
144 k = poll(pollfd, notify > 0 ? 2 : 1, sleep_for);
156 if (notify > 0 && pollfd[POLL_INOTIFY].revents != 0)
159 if (pollfd[POLL_TTY].revents == 0)
162 n = read(ttyfd >= 0 ? ttyfd : STDIN_FILENO, &c, 1);
164 if (errno == EINTR || errno == EAGAIN)
175 else if (c == 21) { /* C-u */
178 backspace_chars(ttyfd, p);
181 } else if (c == '\b' || c == 127) {
186 backspace_chars(ttyfd, 1);
189 } else if (!dirty && !silent_mode) {
193 /* There are two ways to enter silent
194 * mode. Either by pressing backspace
195 * as first key (and only as first key),
198 loop_write(ttyfd, "(no echo) ", 10, false);
200 } else if (ttyfd >= 0)
201 loop_write(ttyfd, "\a", 1, false);
203 } else if (c == '\t' && !silent_mode) {
205 backspace_chars(ttyfd, p);
208 /* ... or by pressing TAB at any time. */
211 loop_write(ttyfd, "(no echo) ", 10, false);
213 if (p >= sizeof(passphrase)-1) {
214 loop_write(ttyfd, "\a", 1, false);
220 if (!silent_mode && ttyfd >= 0)
221 loop_write(ttyfd, "*", 1, false);
227 x = strndup(passphrase, p);
237 if (ttyfd >= 0 && reset_tty) {
238 loop_write(ttyfd, "\n", 1, false);
239 tcsetattr(ttyfd, TCSADRAIN, &old_termios);
245 static int create_socket(char **name) {
249 struct sockaddr_un un;
251 .un.sun_family = AF_UNIX,
259 fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
261 log_error("socket() failed: %m");
265 snprintf(sa.un.sun_path, sizeof(sa.un.sun_path)-1, "/run/systemd/ask-password/sck.%" PRIx64, random_u64());
267 RUN_WITH_UMASK(0177) {
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 c = strdup(sa.un.sun_path);
298 int ask_password_agent(
303 char ***_passphrases) {
311 char temp[] = "/run/systemd/ask-password/tmp.XXXXXX";
312 char final[sizeof(temp)] = "";
313 _cleanup_fclose_ FILE *f = NULL;
314 _cleanup_free_ char *socket_name = NULL;
315 _cleanup_close_ int socket_fd = -1, signal_fd = -1, fd = -1;
316 sigset_t mask, oldmask;
317 struct pollfd pollfd[_FD_MAX];
320 assert(_passphrases);
322 assert_se(sigemptyset(&mask) == 0);
323 sigset_add_many(&mask, SIGINT, SIGTERM, -1);
324 assert_se(sigprocmask(SIG_BLOCK, &mask, &oldmask) == 0);
326 mkdir_p_label("/run/systemd/ask-password", 0755);
328 fd = mkostemp_safe(temp, O_WRONLY|O_CLOEXEC);
330 log_error("Failed to create password file: %m");
339 log_error("Failed to allocate FILE: %m");
346 signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC);
348 log_error("signalfd(): %m");
353 socket_fd = create_socket(&socket_name);
365 (unsigned long) getpid(),
367 accept_cached ? 1 : 0,
368 (unsigned long long) until);
371 fprintf(f, "Message=%s\n", message);
374 fprintf(f, "Icon=%s\n", icon);
379 log_error("Failed to write query file: %m");
384 memcpy(final, temp, sizeof(temp));
386 final[sizeof(final)-11] = 'a';
387 final[sizeof(final)-10] = 's';
388 final[sizeof(final)-9] = 'k';
390 if (rename(temp, final) < 0) {
391 log_error("Failed to rename query file: %m");
397 pollfd[FD_SOCKET].fd = socket_fd;
398 pollfd[FD_SOCKET].events = POLLIN;
399 pollfd[FD_SIGNAL].fd = signal_fd;
400 pollfd[FD_SIGNAL].events = POLLIN;
403 char passphrase[LINE_MAX+1];
404 struct msghdr msghdr;
408 struct cmsghdr cmsghdr;
409 uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];
415 t = now(CLOCK_MONOTONIC);
417 if (until > 0 && until <= t) {
418 log_notice("Timed out");
423 k = poll(pollfd, _FD_MAX, until > 0 ? (int) ((until-t)/USEC_PER_MSEC) : -1);
428 log_error("poll() failed: %m");
434 log_notice("Timed out");
439 if (pollfd[FD_SIGNAL].revents & POLLIN) {
444 if (pollfd[FD_SOCKET].revents != POLLIN) {
445 log_error("Unexpected poll() event.");
451 iovec.iov_base = passphrase;
452 iovec.iov_len = sizeof(passphrase);
456 msghdr.msg_iov = &iovec;
457 msghdr.msg_iovlen = 1;
458 msghdr.msg_control = &control;
459 msghdr.msg_controllen = sizeof(control);
461 n = recvmsg(socket_fd, &msghdr, 0);
463 if (errno == EAGAIN ||
467 log_error("recvmsg() failed: %m");
473 log_error("Message too short");
477 if (msghdr.msg_controllen < CMSG_LEN(sizeof(struct ucred)) ||
478 control.cmsghdr.cmsg_level != SOL_SOCKET ||
479 control.cmsghdr.cmsg_type != SCM_CREDENTIALS ||
480 control.cmsghdr.cmsg_len != CMSG_LEN(sizeof(struct ucred))) {
481 log_warning("Received message without credentials. Ignoring.");
485 ucred = (struct ucred*) CMSG_DATA(&control.cmsghdr);
486 if (ucred->uid != 0) {
487 log_warning("Got request from unprivileged user. Ignoring.");
491 if (passphrase[0] == '+') {
495 l = strv_new("", NULL);
497 l = strv_parse_nulstr(passphrase+1, n-1);
498 /* An empty message refers to the empty password */
505 if (strv_length(l) <= 0) {
507 log_error("Invalid packet");
513 } else if (passphrase[0] == '-') {
517 log_error("Invalid packet");
535 assert_se(sigprocmask(SIG_SETMASK, &oldmask, NULL) == 0);
540 int ask_password_auto(const char *message, const char *icon, usec_t until, bool accept_cached, char ***_passphrases) {
542 assert(_passphrases);
544 if (isatty(STDIN_FILENO)) {
546 char *s = NULL, **l = NULL;
548 r = ask_password_tty(message, until, NULL, &s);
552 r = strv_consume(&l, s);
559 return ask_password_agent(message, icon, until, accept_cached, _passphrases);