650 lines
19 KiB
C
650 lines
19 KiB
C
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <stdbool.h>
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#include <errno.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <stddef.h>
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#include <sys/poll.h>
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#include <sys/inotify.h>
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#include <unistd.h>
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#include <getopt.h>
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#include <sys/signalfd.h>
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#include <fcntl.h>
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#include "util.h"
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#include "conf-parser.h"
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#include "utmp-wtmp.h"
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#include "socket-util.h"
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#include "ask-password-api.h"
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static enum {
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ACTION_LIST,
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ACTION_QUERY,
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ACTION_WATCH,
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ACTION_WALL
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} arg_action = ACTION_QUERY;
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static bool arg_plymouth = false;
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static bool arg_console = false;
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static int ask_password_plymouth(const char *message, usec_t until, const char *flag_file, char **_passphrase) {
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int fd = -1, notify = -1;
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union sockaddr_union sa;
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char *packet = NULL;
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ssize_t k;
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int r, n;
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struct pollfd pollfd[2];
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char buffer[LINE_MAX];
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size_t p = 0;
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enum {
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POLL_SOCKET,
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POLL_INOTIFY
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};
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if (flag_file) {
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if ((notify = inotify_init1(IN_CLOEXEC|IN_NONBLOCK)) < 0) {
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r = -errno;
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goto finish;
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}
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if (inotify_add_watch(notify, flag_file, IN_ATTRIB /* for the link count */) < 0) {
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r = -errno;
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goto finish;
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}
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}
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if ((fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0)) < 0) {
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r = -errno;
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goto finish;
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}
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zero(sa);
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sa.sa.sa_family = AF_UNIX;
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strncpy(sa.un.sun_path+1, "/org/freedesktop/plymouthd", sizeof(sa.un.sun_path)-1);
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if (connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + 1 + strlen(sa.un.sun_path+1)) < 0) {
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log_error("FAILED TO CONNECT: %m");
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r = -errno;
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goto finish;
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}
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if (asprintf(&packet, "*\002%c%s%n", (int) (strlen(message) + 1), message, &n) < 0) {
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r = -ENOMEM;
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goto finish;
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}
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if ((k = loop_write(fd, packet, n+1, true)) != n+1) {
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r = k < 0 ? (int) k : -EIO;
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goto finish;
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}
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zero(pollfd);
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pollfd[POLL_SOCKET].fd = fd;
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pollfd[POLL_SOCKET].events = POLLIN;
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pollfd[POLL_INOTIFY].fd = notify;
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pollfd[POLL_INOTIFY].events = POLLIN;
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for (;;) {
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int sleep_for = -1, j;
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if (until > 0) {
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usec_t y;
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y = now(CLOCK_MONOTONIC);
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if (y > until) {
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r = -ETIMEDOUT;
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goto finish;
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}
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sleep_for = (int) ((until - y) / USEC_PER_MSEC);
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}
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if (flag_file)
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if (access(flag_file, F_OK) < 0) {
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r = -errno;
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goto finish;
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}
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if ((j = poll(pollfd, notify > 0 ? 2 : 1, sleep_for)) < 0) {
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if (errno == EINTR)
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continue;
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r = -errno;
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goto finish;
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} else if (j == 0) {
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r = -ETIMEDOUT;
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goto finish;
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}
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if (notify > 0 && pollfd[POLL_INOTIFY].revents != 0)
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flush_fd(notify);
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if (pollfd[POLL_SOCKET].revents == 0)
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continue;
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if ((k = read(fd, buffer + p, sizeof(buffer) - p)) <= 0) {
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r = k < 0 ? -errno : -EIO;
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goto finish;
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}
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p += k;
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if (p < 1)
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continue;
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if (buffer[0] == 5) {
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/* No password, because UI not shown */
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r = -ENOENT;
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goto finish;
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} else if (buffer[0] == 2) {
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uint32_t size;
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char *s;
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/* One answer */
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if (p < 5)
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continue;
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memcpy(&size, buffer+1, sizeof(size));
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if (size+5 > sizeof(buffer)) {
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r = -EIO;
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goto finish;
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}
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if (p-5 < size)
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continue;
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if (!(s = strndup(buffer + 5, size))) {
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r = -ENOMEM;
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goto finish;
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}
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*_passphrase = s;
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break;
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} else {
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/* Unknown packet */
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r = -EIO;
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goto finish;
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}
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}
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r = 0;
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finish:
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if (notify >= 0)
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close_nointr_nofail(notify);
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if (fd >= 0)
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close_nointr_nofail(fd);
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free(packet);
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return r;
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}
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static int parse_password(const char *filename, char **wall) {
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char *socket_name = NULL, *message = NULL, *packet = NULL;
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uint64_t not_after = 0;
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unsigned pid = 0;
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int socket_fd = -1;
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const ConfigItem items[] = {
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{ "Socket", config_parse_string, &socket_name, "Ask" },
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{ "NotAfter", config_parse_uint64, ¬_after, "Ask" },
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{ "Message", config_parse_string, &message, "Ask" },
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{ "PID", config_parse_unsigned, &pid, "Ask" },
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{ NULL, NULL, NULL, NULL }
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};
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FILE *f;
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int r;
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usec_t n;
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assert(filename);
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if (!(f = fopen(filename, "re"))) {
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if (errno == ENOENT)
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return 0;
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log_error("open(%s): %m", filename);
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return -errno;
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}
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if ((r = config_parse(filename, f, NULL, items, true, NULL)) < 0) {
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log_error("Failed to parse password file %s: %s", filename, strerror(-r));
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goto finish;
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}
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if (!socket_name || not_after <= 0) {
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log_error("Invalid password file %s", filename);
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r = -EBADMSG;
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goto finish;
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}
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n = now(CLOCK_MONOTONIC);
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if (n > not_after) {
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r = 0;
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goto finish;
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}
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if (arg_action == ACTION_LIST)
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printf("'%s' (PID %u)\n", message, pid);
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else if (arg_action == ACTION_WALL) {
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char *_wall;
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if (asprintf(&_wall,
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"%s%sPassword entry required for \'%s\' (PID %u).\r\n"
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"Please enter password with the systemd-tty-ask-password-agent tool!",
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*wall ? *wall : "",
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*wall ? "\r\n\r\n" : "",
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message,
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pid) < 0) {
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log_error("Out of memory");
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r = -ENOMEM;
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goto finish;
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}
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free(*wall);
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*wall = _wall;
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} else {
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union {
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struct sockaddr sa;
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struct sockaddr_un un;
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} sa;
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char *password;
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assert(arg_action == ACTION_QUERY ||
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arg_action == ACTION_WATCH);
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if (access(socket_name, W_OK) < 0) {
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if (arg_action == ACTION_QUERY)
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log_info("Not querying '%s' (PID %u), lacking privileges.", message, pid);
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r = 0;
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goto finish;
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}
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if (arg_plymouth)
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r = ask_password_plymouth(message, not_after, filename, &password);
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else {
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int tty_fd = -1;
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if (arg_console)
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if ((tty_fd = acquire_terminal("/dev/console", false, false, false)) < 0) {
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r = tty_fd;
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goto finish;
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}
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r = ask_password_tty(message, not_after, filename, &password);
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if (arg_console) {
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close_nointr_nofail(tty_fd);
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release_terminal();
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}
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}
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if (r < 0) {
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log_error("Failed to query password: %s", strerror(-r));
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goto finish;
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}
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asprintf(&packet, "+%s", password);
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free(password);
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if (!packet) {
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log_error("Out of memory");
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r = -ENOMEM;
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goto finish;
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}
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if ((socket_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0)) < 0) {
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log_error("socket(): %m");
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r = -errno;
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goto finish;
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}
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zero(sa);
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sa.un.sun_family = AF_UNIX;
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strncpy(sa.un.sun_path, socket_name, sizeof(sa.un.sun_path));
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if (sendto(socket_fd, packet, strlen(packet), MSG_NOSIGNAL, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(socket_name)) < 0) {
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log_error("Failed to send: %m");
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r = -errno;
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goto finish;
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}
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}
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finish:
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fclose(f);
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if (socket_fd >= 0)
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close_nointr_nofail(socket_fd);
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free(packet);
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free(socket_name);
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free(message);
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return r;
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}
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static int wall_tty_block(void) {
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char *p;
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const char *t;
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int fd;
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if (!(t = ttyname(STDIN_FILENO)))
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return -errno;
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if (asprintf(&p, "/dev/.systemd/ask-password-block/%s", file_name_from_path(t)) < 0)
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return -ENOMEM;
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mkdir_parents(p, 0700);
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mkfifo(p, 0600);
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fd = open(p, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
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free(p);
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if (fd < 0)
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return -errno;
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return fd;
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}
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static bool wall_tty_match(const char *path) {
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int fd;
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char *p;
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/* We use named pipes to ensure that wall messages suggesting
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* password entry are not printed over password prompts
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* already shown. We use the fact here that opening a pipe in
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* non-blocking mode for write-only will succeed only if
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* there's some writer behind it. Using pipes has the
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* advantage that the block will automatically go away if the
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* process dies. */
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if (asprintf(&p, "/dev/.systemd/ask-password-block/%s", file_name_from_path(path)) < 0)
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return true;
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fd = open(p, O_WRONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
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free(p);
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if (fd < 0)
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return true;
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/* What, we managed to open the pipe? Then this tty is filtered. */
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close_nointr_nofail(fd);
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return false;
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}
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static int show_passwords(void) {
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DIR *d;
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struct dirent *de;
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int r = 0;
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if (!(d = opendir("/dev/.systemd/ask-password"))) {
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if (errno == ENOENT)
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return 0;
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log_error("opendir(): %m");
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return -errno;
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}
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while ((de = readdir(d))) {
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char *p;
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int q;
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char *wall;
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if (de->d_type != DT_REG)
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continue;
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if (ignore_file(de->d_name))
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continue;
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if (!startswith(de->d_name, "ask."))
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continue;
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if (!(p = strappend("/dev/.systemd/ask-password/", de->d_name))) {
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log_error("Out of memory");
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r = -ENOMEM;
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goto finish;
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}
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wall = NULL;
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if ((q = parse_password(p, &wall)) < 0)
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r = q;
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free(p);
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if (wall) {
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utmp_wall(wall, wall_tty_match);
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free(wall);
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}
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}
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finish:
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if (d)
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closedir(d);
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return r;
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}
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static int watch_passwords(void) {
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enum {
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FD_INOTIFY,
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FD_SIGNAL,
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_FD_MAX
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};
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int notify = -1, signal_fd = -1, tty_block_fd = -1;
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struct pollfd pollfd[_FD_MAX];
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sigset_t mask;
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int r;
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tty_block_fd = wall_tty_block();
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mkdir_p("/dev/.systemd/ask-password", 0755);
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if ((notify = inotify_init1(IN_CLOEXEC)) < 0) {
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r = -errno;
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goto finish;
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}
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if (inotify_add_watch(notify, "/dev/.systemd/ask-password", IN_CLOSE_WRITE|IN_MOVED_TO) < 0) {
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r = -errno;
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goto finish;
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}
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assert_se(sigemptyset(&mask) == 0);
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sigset_add_many(&mask, SIGINT, SIGTERM, -1);
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assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
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if ((signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC)) < 0) {
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log_error("signalfd(): %m");
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r = -errno;
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goto finish;
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}
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zero(pollfd);
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pollfd[FD_INOTIFY].fd = notify;
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pollfd[FD_INOTIFY].events = POLLIN;
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pollfd[FD_SIGNAL].fd = signal_fd;
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pollfd[FD_SIGNAL].events = POLLIN;
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for (;;) {
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if ((r = show_passwords()) < 0)
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log_error("Failed to show password: %s", strerror(-r));
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if (poll(pollfd, _FD_MAX, -1) < 0) {
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if (errno == EINTR)
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continue;
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r = -errno;
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goto finish;
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}
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if (pollfd[FD_INOTIFY].revents != 0)
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flush_fd(notify);
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if (pollfd[FD_SIGNAL].revents != 0)
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break;
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}
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r = 0;
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finish:
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if (notify >= 0)
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close_nointr_nofail(notify);
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if (signal_fd >= 0)
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close_nointr_nofail(signal_fd);
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if (tty_block_fd >= 0)
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close_nointr_nofail(tty_block_fd);
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return r;
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}
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static int help(void) {
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printf("%s [OPTIONS...]\n\n"
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"Process system password requests.\n\n"
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" -h --help Show this help\n"
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" --list Show pending password requests\n"
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" --query Process pending password requests\n"
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" --watch Continously process password requests\n"
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" --wall Continously forward password requests to wall\n"
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" --plymouth Ask question with Plymouth instead of on TTY\n"
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" --console Ask question on /dev/console instead of current TTY\n",
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program_invocation_short_name);
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return 0;
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}
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static int parse_argv(int argc, char *argv[]) {
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enum {
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ARG_LIST = 0x100,
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ARG_QUERY,
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ARG_WATCH,
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ARG_WALL,
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ARG_PLYMOUTH,
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ARG_CONSOLE
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};
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static const struct option options[] = {
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{ "help", no_argument, NULL, 'h' },
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{ "list", no_argument, NULL, ARG_LIST },
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{ "query", no_argument, NULL, ARG_QUERY },
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{ "watch", no_argument, NULL, ARG_WATCH },
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{ "wall", no_argument, NULL, ARG_WALL },
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{ "plymouth", no_argument, NULL, ARG_PLYMOUTH },
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{ "console", no_argument, NULL, ARG_CONSOLE },
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{ NULL, 0, NULL, 0 }
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};
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int c;
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assert(argc >= 0);
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assert(argv);
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while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) {
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switch (c) {
|
|
|
|
case 'h':
|
|
help();
|
|
return 0;
|
|
|
|
case ARG_LIST:
|
|
arg_action = ACTION_LIST;
|
|
break;
|
|
|
|
case ARG_QUERY:
|
|
arg_action = ACTION_QUERY;
|
|
break;
|
|
|
|
case ARG_WATCH:
|
|
arg_action = ACTION_WATCH;
|
|
break;
|
|
|
|
case ARG_WALL:
|
|
arg_action = ACTION_WALL;
|
|
break;
|
|
|
|
case ARG_PLYMOUTH:
|
|
arg_plymouth = true;
|
|
break;
|
|
|
|
case ARG_CONSOLE:
|
|
arg_console = true;
|
|
break;
|
|
|
|
case '?':
|
|
return -EINVAL;
|
|
|
|
default:
|
|
log_error("Unknown option code %c", c);
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
if (optind != argc) {
|
|
help();
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
int main(int argc, char *argv[]) {
|
|
int r;
|
|
|
|
log_parse_environment();
|
|
log_open();
|
|
|
|
if ((r = parse_argv(argc, argv)) <= 0)
|
|
goto finish;
|
|
|
|
if (arg_console) {
|
|
setsid();
|
|
release_terminal();
|
|
}
|
|
|
|
if (arg_action == ACTION_WATCH ||
|
|
arg_action == ACTION_WALL)
|
|
r = watch_passwords();
|
|
else
|
|
r = show_passwords();
|
|
|
|
if (r < 0)
|
|
log_error("Error: %s", strerror(-r));
|
|
|
|
finish:
|
|
return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
|
|
}
|