578 lines
16 KiB
C
578 lines
16 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
|
|
|
|
/***
|
|
This file is part of systemd.
|
|
|
|
Copyright 2010 Lennart Poettering
|
|
|
|
systemd is free software; you can redistribute it and/or modify it
|
|
under the terms of the GNU Lesser General Public License as published by
|
|
the Free Software Foundation; either version 2.1 of the License, or
|
|
(at your option) any later version.
|
|
|
|
systemd is distributed in the hope that it will be useful, but
|
|
WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public License
|
|
along with systemd; If not, see <http://www.gnu.org/licenses/>.
|
|
***/
|
|
#include <stdbool.h>
|
|
#include <termios.h>
|
|
#include <unistd.h>
|
|
#include <sys/poll.h>
|
|
#include <sys/inotify.h>
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <sys/socket.h>
|
|
#include <string.h>
|
|
#include <sys/un.h>
|
|
#include <stddef.h>
|
|
#include <sys/signalfd.h>
|
|
|
|
#include "util.h"
|
|
#include "mkdir.h"
|
|
#include "strv.h"
|
|
|
|
#include "ask-password-api.h"
|
|
|
|
static void backspace_chars(int ttyfd, size_t p) {
|
|
|
|
if (ttyfd < 0)
|
|
return;
|
|
|
|
while (p > 0) {
|
|
p--;
|
|
|
|
loop_write(ttyfd, "\b \b", 3, false);
|
|
}
|
|
}
|
|
|
|
int ask_password_tty(
|
|
const char *message,
|
|
usec_t until,
|
|
const char *flag_file,
|
|
char **_passphrase) {
|
|
|
|
struct termios old_termios, new_termios;
|
|
char passphrase[LINE_MAX];
|
|
size_t p = 0;
|
|
int r, ttyfd = -1, notify = -1;
|
|
struct pollfd pollfd[2];
|
|
bool reset_tty = false;
|
|
bool silent_mode = false;
|
|
bool dirty = false;
|
|
enum {
|
|
POLL_TTY,
|
|
POLL_INOTIFY
|
|
};
|
|
|
|
assert(message);
|
|
assert(_passphrase);
|
|
|
|
if (flag_file) {
|
|
if ((notify = inotify_init1(IN_CLOEXEC|IN_NONBLOCK)) < 0) {
|
|
r = -errno;
|
|
goto finish;
|
|
}
|
|
|
|
if (inotify_add_watch(notify, flag_file, IN_ATTRIB /* for the link count */) < 0) {
|
|
r = -errno;
|
|
goto finish;
|
|
}
|
|
}
|
|
|
|
if ((ttyfd = open("/dev/tty", O_RDWR|O_NOCTTY|O_CLOEXEC)) >= 0) {
|
|
|
|
if (tcgetattr(ttyfd, &old_termios) < 0) {
|
|
r = -errno;
|
|
goto finish;
|
|
}
|
|
|
|
loop_write(ttyfd, ANSI_HIGHLIGHT_ON, sizeof(ANSI_HIGHLIGHT_ON)-1, false);
|
|
loop_write(ttyfd, message, strlen(message), false);
|
|
loop_write(ttyfd, " ", 1, false);
|
|
loop_write(ttyfd, ANSI_HIGHLIGHT_OFF, sizeof(ANSI_HIGHLIGHT_OFF)-1, false);
|
|
|
|
new_termios = old_termios;
|
|
new_termios.c_lflag &= ~(ICANON|ECHO);
|
|
new_termios.c_cc[VMIN] = 1;
|
|
new_termios.c_cc[VTIME] = 0;
|
|
|
|
if (tcsetattr(ttyfd, TCSADRAIN, &new_termios) < 0) {
|
|
r = -errno;
|
|
goto finish;
|
|
}
|
|
|
|
reset_tty = true;
|
|
}
|
|
|
|
zero(pollfd);
|
|
|
|
pollfd[POLL_TTY].fd = ttyfd >= 0 ? ttyfd : STDIN_FILENO;
|
|
pollfd[POLL_TTY].events = POLLIN;
|
|
pollfd[POLL_INOTIFY].fd = notify;
|
|
pollfd[POLL_INOTIFY].events = POLLIN;
|
|
|
|
for (;;) {
|
|
char c;
|
|
int sleep_for = -1, k;
|
|
ssize_t n;
|
|
|
|
if (until > 0) {
|
|
usec_t y;
|
|
|
|
y = now(CLOCK_MONOTONIC);
|
|
|
|
if (y > until) {
|
|
r = -ETIME;
|
|
goto finish;
|
|
}
|
|
|
|
sleep_for = (int) ((until - y) / USEC_PER_MSEC);
|
|
}
|
|
|
|
if (flag_file)
|
|
if (access(flag_file, F_OK) < 0) {
|
|
r = -errno;
|
|
goto finish;
|
|
}
|
|
|
|
if ((k = poll(pollfd, notify > 0 ? 2 : 1, sleep_for)) < 0) {
|
|
|
|
if (errno == EINTR)
|
|
continue;
|
|
|
|
r = -errno;
|
|
goto finish;
|
|
} else if (k == 0) {
|
|
r = -ETIME;
|
|
goto finish;
|
|
}
|
|
|
|
if (notify > 0 && pollfd[POLL_INOTIFY].revents != 0)
|
|
flush_fd(notify);
|
|
|
|
if (pollfd[POLL_TTY].revents == 0)
|
|
continue;
|
|
|
|
if ((n = read(ttyfd >= 0 ? ttyfd : STDIN_FILENO, &c, 1)) < 0) {
|
|
|
|
if (errno == EINTR || errno == EAGAIN)
|
|
continue;
|
|
|
|
r = -errno;
|
|
goto finish;
|
|
|
|
} else if (n == 0)
|
|
break;
|
|
|
|
if (c == '\n')
|
|
break;
|
|
else if (c == 21) { /* C-u */
|
|
|
|
if (!silent_mode)
|
|
backspace_chars(ttyfd, p);
|
|
p = 0;
|
|
|
|
} else if (c == '\b' || c == 127) {
|
|
|
|
if (p > 0) {
|
|
|
|
if (!silent_mode)
|
|
backspace_chars(ttyfd, 1);
|
|
|
|
p--;
|
|
} else if (!dirty && !silent_mode) {
|
|
|
|
silent_mode = true;
|
|
|
|
/* There are two ways to enter silent
|
|
* mode. Either by pressing backspace
|
|
* as first key (and only as first key),
|
|
* or ... */
|
|
if (ttyfd >= 0)
|
|
loop_write(ttyfd, "(no echo) ", 10, false);
|
|
|
|
} else if (ttyfd >= 0)
|
|
loop_write(ttyfd, "\a", 1, false);
|
|
|
|
} else if (c == '\t' && !silent_mode) {
|
|
|
|
backspace_chars(ttyfd, p);
|
|
silent_mode = true;
|
|
|
|
/* ... or by pressing TAB at any time. */
|
|
|
|
if (ttyfd >= 0)
|
|
loop_write(ttyfd, "(no echo) ", 10, false);
|
|
} else {
|
|
passphrase[p++] = c;
|
|
|
|
if (!silent_mode && ttyfd >= 0)
|
|
loop_write(ttyfd, "*", 1, false);
|
|
|
|
dirty = true;
|
|
}
|
|
}
|
|
|
|
passphrase[p] = 0;
|
|
|
|
if (!(*_passphrase = strdup(passphrase))) {
|
|
r = -ENOMEM;
|
|
goto finish;
|
|
}
|
|
|
|
r = 0;
|
|
|
|
finish:
|
|
if (notify >= 0)
|
|
close_nointr_nofail(notify);
|
|
|
|
if (ttyfd >= 0) {
|
|
|
|
if (reset_tty) {
|
|
loop_write(ttyfd, "\n", 1, false);
|
|
tcsetattr(ttyfd, TCSADRAIN, &old_termios);
|
|
}
|
|
|
|
close_nointr_nofail(ttyfd);
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
static int create_socket(char **name) {
|
|
int fd;
|
|
union {
|
|
struct sockaddr sa;
|
|
struct sockaddr_un un;
|
|
} sa;
|
|
int one = 1, r;
|
|
char *c;
|
|
mode_t u;
|
|
|
|
assert(name);
|
|
|
|
if ((fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0)) < 0) {
|
|
log_error("socket() failed: %m");
|
|
return -errno;
|
|
}
|
|
|
|
zero(sa);
|
|
sa.un.sun_family = AF_UNIX;
|
|
snprintf(sa.un.sun_path, sizeof(sa.un.sun_path)-1, "/run/systemd/ask-password/sck.%llu", random_ull());
|
|
|
|
u = umask(0177);
|
|
r = bind(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(sa.un.sun_path));
|
|
umask(u);
|
|
|
|
if (r < 0) {
|
|
r = -errno;
|
|
log_error("bind() failed: %m");
|
|
goto fail;
|
|
}
|
|
|
|
if (setsockopt(fd, SOL_SOCKET, SO_PASSCRED, &one, sizeof(one)) < 0) {
|
|
r = -errno;
|
|
log_error("SO_PASSCRED failed: %m");
|
|
goto fail;
|
|
}
|
|
|
|
if (!(c = strdup(sa.un.sun_path))) {
|
|
r = -ENOMEM;
|
|
log_error("Out of memory");
|
|
goto fail;
|
|
}
|
|
|
|
*name = c;
|
|
return fd;
|
|
|
|
fail:
|
|
close_nointr_nofail(fd);
|
|
|
|
return r;
|
|
}
|
|
|
|
int ask_password_agent(
|
|
const char *message,
|
|
const char *icon,
|
|
usec_t until,
|
|
bool accept_cached,
|
|
char ***_passphrases) {
|
|
|
|
enum {
|
|
FD_SOCKET,
|
|
FD_SIGNAL,
|
|
_FD_MAX
|
|
};
|
|
|
|
char temp[] = "/run/systemd/ask-password/tmp.XXXXXX";
|
|
char final[sizeof(temp)] = "";
|
|
int fd = -1, r;
|
|
FILE *f = NULL;
|
|
char *socket_name = NULL;
|
|
int socket_fd = -1, signal_fd = -1;
|
|
sigset_t mask, oldmask;
|
|
struct pollfd pollfd[_FD_MAX];
|
|
mode_t u;
|
|
|
|
assert(_passphrases);
|
|
|
|
assert_se(sigemptyset(&mask) == 0);
|
|
sigset_add_many(&mask, SIGINT, SIGTERM, -1);
|
|
assert_se(sigprocmask(SIG_BLOCK, &mask, &oldmask) == 0);
|
|
|
|
mkdir_p("/run/systemd/ask-password", 0755);
|
|
|
|
u = umask(0022);
|
|
fd = mkostemp(temp, O_CLOEXEC|O_CREAT|O_WRONLY);
|
|
umask(u);
|
|
|
|
if (fd < 0) {
|
|
log_error("Failed to create password file: %m");
|
|
r = -errno;
|
|
goto finish;
|
|
}
|
|
|
|
fchmod(fd, 0644);
|
|
|
|
if (!(f = fdopen(fd, "w"))) {
|
|
log_error("Failed to allocate FILE: %m");
|
|
r = -errno;
|
|
goto finish;
|
|
}
|
|
|
|
fd = -1;
|
|
|
|
if ((signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC)) < 0) {
|
|
log_error("signalfd(): %m");
|
|
r = -errno;
|
|
goto finish;
|
|
}
|
|
|
|
if ((socket_fd = create_socket(&socket_name)) < 0) {
|
|
r = socket_fd;
|
|
goto finish;
|
|
}
|
|
|
|
fprintf(f,
|
|
"[Ask]\n"
|
|
"PID=%lu\n"
|
|
"Socket=%s\n"
|
|
"AcceptCached=%i\n"
|
|
"NotAfter=%llu\n",
|
|
(unsigned long) getpid(),
|
|
socket_name,
|
|
accept_cached ? 1 : 0,
|
|
(unsigned long long) until);
|
|
|
|
if (message)
|
|
fprintf(f, "Message=%s\n", message);
|
|
|
|
if (icon)
|
|
fprintf(f, "Icon=%s\n", icon);
|
|
|
|
fflush(f);
|
|
|
|
if (ferror(f)) {
|
|
log_error("Failed to write query file: %m");
|
|
r = -errno;
|
|
goto finish;
|
|
}
|
|
|
|
memcpy(final, temp, sizeof(temp));
|
|
|
|
final[sizeof(final)-11] = 'a';
|
|
final[sizeof(final)-10] = 's';
|
|
final[sizeof(final)-9] = 'k';
|
|
|
|
if (rename(temp, final) < 0) {
|
|
log_error("Failed to rename query file: %m");
|
|
r = -errno;
|
|
goto finish;
|
|
}
|
|
|
|
zero(pollfd);
|
|
pollfd[FD_SOCKET].fd = socket_fd;
|
|
pollfd[FD_SOCKET].events = POLLIN;
|
|
pollfd[FD_SIGNAL].fd = signal_fd;
|
|
pollfd[FD_SIGNAL].events = POLLIN;
|
|
|
|
for (;;) {
|
|
char passphrase[LINE_MAX+1];
|
|
struct msghdr msghdr;
|
|
struct iovec iovec;
|
|
struct ucred *ucred;
|
|
union {
|
|
struct cmsghdr cmsghdr;
|
|
uint8_t buf[CMSG_SPACE(sizeof(struct ucred))];
|
|
} control;
|
|
ssize_t n;
|
|
int k;
|
|
usec_t t;
|
|
|
|
t = now(CLOCK_MONOTONIC);
|
|
|
|
if (until > 0 && until <= t) {
|
|
log_notice("Timed out");
|
|
r = -ETIME;
|
|
goto finish;
|
|
}
|
|
|
|
if ((k = poll(pollfd, _FD_MAX, until > 0 ? (int) ((until-t)/USEC_PER_MSEC) : -1)) < 0) {
|
|
|
|
if (errno == EINTR)
|
|
continue;
|
|
|
|
log_error("poll() failed: %m");
|
|
r = -errno;
|
|
goto finish;
|
|
}
|
|
|
|
if (k <= 0) {
|
|
log_notice("Timed out");
|
|
r = -ETIME;
|
|
goto finish;
|
|
}
|
|
|
|
if (pollfd[FD_SIGNAL].revents & POLLIN) {
|
|
r = -EINTR;
|
|
goto finish;
|
|
}
|
|
|
|
if (pollfd[FD_SOCKET].revents != POLLIN) {
|
|
log_error("Unexpected poll() event.");
|
|
r = -EIO;
|
|
goto finish;
|
|
}
|
|
|
|
zero(iovec);
|
|
iovec.iov_base = passphrase;
|
|
iovec.iov_len = sizeof(passphrase);
|
|
|
|
zero(control);
|
|
zero(msghdr);
|
|
msghdr.msg_iov = &iovec;
|
|
msghdr.msg_iovlen = 1;
|
|
msghdr.msg_control = &control;
|
|
msghdr.msg_controllen = sizeof(control);
|
|
|
|
if ((n = recvmsg(socket_fd, &msghdr, 0)) < 0) {
|
|
|
|
if (errno == EAGAIN ||
|
|
errno == EINTR)
|
|
continue;
|
|
|
|
log_error("recvmsg() failed: %m");
|
|
r = -errno;
|
|
goto finish;
|
|
}
|
|
|
|
if (n <= 0) {
|
|
log_error("Message too short");
|
|
continue;
|
|
}
|
|
|
|
if (msghdr.msg_controllen < CMSG_LEN(sizeof(struct ucred)) ||
|
|
control.cmsghdr.cmsg_level != SOL_SOCKET ||
|
|
control.cmsghdr.cmsg_type != SCM_CREDENTIALS ||
|
|
control.cmsghdr.cmsg_len != CMSG_LEN(sizeof(struct ucred))) {
|
|
log_warning("Received message without credentials. Ignoring.");
|
|
continue;
|
|
}
|
|
|
|
ucred = (struct ucred*) CMSG_DATA(&control.cmsghdr);
|
|
if (ucred->uid != 0) {
|
|
log_warning("Got request from unprivileged user. Ignoring.");
|
|
continue;
|
|
}
|
|
|
|
if (passphrase[0] == '+') {
|
|
char **l;
|
|
|
|
if (n == 1)
|
|
l = strv_new("", NULL);
|
|
else
|
|
l = strv_parse_nulstr(passphrase+1, n-1);
|
|
/* An empty message refers to the empty password */
|
|
|
|
if (!l) {
|
|
r = -ENOMEM;
|
|
goto finish;
|
|
}
|
|
|
|
if (strv_length(l) <= 0) {
|
|
strv_free(l);
|
|
log_error("Invalid packet");
|
|
continue;
|
|
}
|
|
|
|
*_passphrases = l;
|
|
|
|
} else if (passphrase[0] == '-') {
|
|
r = -ECANCELED;
|
|
goto finish;
|
|
} else {
|
|
log_error("Invalid packet");
|
|
continue;
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
r = 0;
|
|
|
|
finish:
|
|
if (fd >= 0)
|
|
close_nointr_nofail(fd);
|
|
|
|
if (socket_name) {
|
|
unlink(socket_name);
|
|
free(socket_name);
|
|
}
|
|
|
|
if (socket_fd >= 0)
|
|
close_nointr_nofail(socket_fd);
|
|
|
|
if (signal_fd >= 0)
|
|
close_nointr_nofail(signal_fd);
|
|
|
|
if (f)
|
|
fclose(f);
|
|
|
|
unlink(temp);
|
|
|
|
if (final[0])
|
|
unlink(final);
|
|
|
|
assert_se(sigprocmask(SIG_SETMASK, &oldmask, NULL) == 0);
|
|
|
|
return r;
|
|
}
|
|
|
|
int ask_password_auto(const char *message, const char *icon, usec_t until, bool accept_cached, char ***_passphrases) {
|
|
assert(message);
|
|
assert(_passphrases);
|
|
|
|
if (isatty(STDIN_FILENO)) {
|
|
int r;
|
|
char *s = NULL, **l = NULL;
|
|
|
|
if ((r = ask_password_tty(message, until, NULL, &s)) < 0)
|
|
return r;
|
|
|
|
l = strv_new(s, NULL);
|
|
free(s);
|
|
|
|
if (!l)
|
|
return -ENOMEM;
|
|
|
|
*_passphrases = l;
|
|
return r;
|
|
|
|
} else
|
|
return ask_password_agent(message, icon, until, accept_cached, _passphrases);
|
|
}
|