+++ /dev/null
-/*-*- 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 <errno.h>
-#include <string.h>
-#include <sys/socket.h>
-#include <sys/un.h>
-#include <stddef.h>
-#include <sys/poll.h>
-#include <sys/inotify.h>
-#include <unistd.h>
-#include <getopt.h>
-#include <sys/signalfd.h>
-#include <fcntl.h>
-
-#include "util.h"
-#include "mkdir.h"
-#include "conf-parser.h"
-#include "utmp-wtmp.h"
-#include "socket-util.h"
-#include "ask-password-api.h"
-#include "strv.h"
-
-static enum {
- ACTION_LIST,
- ACTION_QUERY,
- ACTION_WATCH,
- ACTION_WALL
-} arg_action = ACTION_QUERY;
-
-static bool arg_plymouth = false;
-static bool arg_console = false;
-
-static int ask_password_plymouth(
- const char *message,
- usec_t until,
- const char *flag_file,
- bool accept_cached,
- char ***_passphrases) {
-
- int fd = -1, notify = -1;
- union sockaddr_union sa;
- char *packet = NULL;
- ssize_t k;
- int r, n;
- struct pollfd pollfd[2];
- char buffer[LINE_MAX];
- size_t p = 0;
- enum {
- POLL_SOCKET,
- POLL_INOTIFY
- };
-
- assert(_passphrases);
-
- 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 ((fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0)) < 0) {
- r = -errno;
- goto finish;
- }
-
- zero(sa);
- sa.sa.sa_family = AF_UNIX;
- strncpy(sa.un.sun_path+1, "/org/freedesktop/plymouthd", sizeof(sa.un.sun_path)-1);
- if (connect(fd, &sa.sa, offsetof(struct sockaddr_un, sun_path) + 1 + strlen(sa.un.sun_path+1)) < 0) {
- log_error("Failed to connect to Plymouth: %m");
- r = -errno;
- goto finish;
- }
-
- if (accept_cached) {
- packet = strdup("c");
- n = 1;
- } else
- asprintf(&packet, "*\002%c%s%n", (int) (strlen(message) + 1), message, &n);
-
- if (!packet) {
- r = -ENOMEM;
- goto finish;
- }
-
- if ((k = loop_write(fd, packet, n+1, true)) != n+1) {
- r = k < 0 ? (int) k : -EIO;
- goto finish;
- }
-
- zero(pollfd);
- pollfd[POLL_SOCKET].fd = fd;
- pollfd[POLL_SOCKET].events = POLLIN;
- pollfd[POLL_INOTIFY].fd = notify;
- pollfd[POLL_INOTIFY].events = POLLIN;
-
- for (;;) {
- int sleep_for = -1, j;
-
- 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 ((j = poll(pollfd, notify > 0 ? 2 : 1, sleep_for)) < 0) {
-
- if (errno == EINTR)
- continue;
-
- r = -errno;
- goto finish;
- } else if (j == 0) {
- r = -ETIME;
- goto finish;
- }
-
- if (notify > 0 && pollfd[POLL_INOTIFY].revents != 0)
- flush_fd(notify);
-
- if (pollfd[POLL_SOCKET].revents == 0)
- continue;
-
- if ((k = read(fd, buffer + p, sizeof(buffer) - p)) <= 0) {
- r = k < 0 ? -errno : -EIO;
- goto finish;
- }
-
- p += k;
-
- if (p < 1)
- continue;
-
- if (buffer[0] == 5) {
-
- if (accept_cached) {
- /* Hmm, first try with cached
- * passwords failed, so let's retry
- * with a normal password request */
- free(packet);
- packet = NULL;
-
- if (asprintf(&packet, "*\002%c%s%n", (int) (strlen(message) + 1), message, &n) < 0) {
- r = -ENOMEM;
- goto finish;
- }
-
- if ((k = loop_write(fd, packet, n+1, true)) != n+1) {
- r = k < 0 ? (int) k : -EIO;
- goto finish;
- }
-
- accept_cached = false;
- p = 0;
- continue;
- }
-
- /* No password, because UI not shown */
- r = -ENOENT;
- goto finish;
-
- } else if (buffer[0] == 2 || buffer[0] == 9) {
- uint32_t size;
- char **l;
-
- /* One ore more answers */
- if (p < 5)
- continue;
-
- memcpy(&size, buffer+1, sizeof(size));
- size = le32toh(size);
- if (size+5 > sizeof(buffer)) {
- r = -EIO;
- goto finish;
- }
-
- if (p-5 < size)
- continue;
-
- if (!(l = strv_parse_nulstr(buffer + 5, size))) {
- r = -ENOMEM;
- goto finish;
- }
-
- *_passphrases = l;
- break;
-
- } else {
- /* Unknown packet */
- r = -EIO;
- goto finish;
- }
- }
-
- r = 0;
-
-finish:
- if (notify >= 0)
- close_nointr_nofail(notify);
-
- if (fd >= 0)
- close_nointr_nofail(fd);
-
- free(packet);
-
- return r;
-}
-
-static int parse_password(const char *filename, char **wall) {
- char *socket_name = NULL, *message = NULL, *packet = NULL;
- uint64_t not_after = 0;
- unsigned pid = 0;
- int socket_fd = -1;
- bool accept_cached = false;
-
- const ConfigTableItem items[] = {
- { "Ask", "Socket", config_parse_string, 0, &socket_name },
- { "Ask", "NotAfter", config_parse_uint64, 0, ¬_after },
- { "Ask", "Message", config_parse_string, 0, &message },
- { "Ask", "PID", config_parse_unsigned, 0, &pid },
- { "Ask", "AcceptCached", config_parse_bool, 0, &accept_cached },
- { NULL, NULL, NULL, 0, NULL }
- };
-
- FILE *f;
- int r;
-
- assert(filename);
-
- f = fopen(filename, "re");
- if (!f) {
- if (errno == ENOENT)
- return 0;
-
- log_error("open(%s): %m", filename);
- return -errno;
- }
-
- r = config_parse(filename, f, NULL, config_item_table_lookup, (void*) items, true, NULL);
- if (r < 0) {
- log_error("Failed to parse password file %s: %s", filename, strerror(-r));
- goto finish;
- }
-
- if (!socket_name) {
- log_error("Invalid password file %s", filename);
- r = -EBADMSG;
- goto finish;
- }
-
- if (not_after > 0) {
- if (now(CLOCK_MONOTONIC) > not_after) {
- r = 0;
- goto finish;
- }
- }
-
- if (pid > 0 &&
- kill(pid, 0) < 0 &&
- errno == ESRCH) {
- r = 0;
- goto finish;
- }
-
- if (arg_action == ACTION_LIST)
- printf("'%s' (PID %u)\n", message, pid);
- else if (arg_action == ACTION_WALL) {
- char *_wall;
-
- if (asprintf(&_wall,
- "%s%sPassword entry required for \'%s\' (PID %u).\r\n"
- "Please enter password with the systemd-tty-ask-password-agent tool!",
- *wall ? *wall : "",
- *wall ? "\r\n\r\n" : "",
- message,
- pid) < 0) {
- log_error("Out of memory");
- r = -ENOMEM;
- goto finish;
- }
-
- free(*wall);
- *wall = _wall;
- } else {
- union {
- struct sockaddr sa;
- struct sockaddr_un un;
- } sa;
- size_t packet_length = 0;
-
- assert(arg_action == ACTION_QUERY ||
- arg_action == ACTION_WATCH);
-
- if (access(socket_name, W_OK) < 0) {
-
- if (arg_action == ACTION_QUERY)
- log_info("Not querying '%s' (PID %u), lacking privileges.", message, pid);
-
- r = 0;
- goto finish;
- }
-
- if (arg_plymouth) {
- char **passwords = NULL;
-
- if ((r = ask_password_plymouth(message, not_after, filename, accept_cached, &passwords)) >= 0) {
- char **p;
-
- packet_length = 1;
- STRV_FOREACH(p, passwords)
- packet_length += strlen(*p) + 1;
-
- if (!(packet = new(char, packet_length)))
- r = -ENOMEM;
- else {
- char *d;
-
- packet[0] = '+';
- d = packet+1;
-
- STRV_FOREACH(p, passwords)
- d = stpcpy(d, *p) + 1;
- }
- }
-
- } else {
- int tty_fd = -1;
- char *password;
-
- if (arg_console)
- if ((tty_fd = acquire_terminal("/dev/console", false, false, false)) < 0) {
- r = tty_fd;
- goto finish;
- }
-
- r = ask_password_tty(message, not_after, filename, &password);
-
- if (arg_console) {
- close_nointr_nofail(tty_fd);
- release_terminal();
- }
-
- if (r >= 0) {
- packet_length = 1+strlen(password)+1;
- if (!(packet = new(char, packet_length)))
- r = -ENOMEM;
- else {
- packet[0] = '+';
- strcpy(packet+1, password);
- }
-
- free(password);
- }
- }
-
- if (r == -ETIME || r == -ENOENT) {
- /* If the query went away, that's OK */
- r = 0;
- goto finish;
- }
-
- if (r < 0) {
- log_error("Failed to query password: %s", strerror(-r));
- goto finish;
- }
-
- if ((socket_fd = socket(AF_UNIX, SOCK_DGRAM|SOCK_CLOEXEC, 0)) < 0) {
- log_error("socket(): %m");
- r = -errno;
- goto finish;
- }
-
- zero(sa);
- sa.un.sun_family = AF_UNIX;
- strncpy(sa.un.sun_path, socket_name, sizeof(sa.un.sun_path));
-
- if (sendto(socket_fd, packet, packet_length, MSG_NOSIGNAL, &sa.sa, offsetof(struct sockaddr_un, sun_path) + strlen(socket_name)) < 0) {
- log_error("Failed to send: %m");
- r = -errno;
- goto finish;
- }
- }
-
-finish:
- fclose(f);
-
- if (socket_fd >= 0)
- close_nointr_nofail(socket_fd);
-
- free(packet);
- free(socket_name);
- free(message);
-
- return r;
-}
-
-static int wall_tty_block(void) {
- char *p;
- int fd, r;
- dev_t devnr;
-
- r = get_ctty_devnr(0, &devnr);
- if (r < 0)
- return -r;
-
- if (asprintf(&p, "/run/systemd/ask-password-block/%u:%u", major(devnr), minor(devnr)) < 0)
- return -ENOMEM;
-
- mkdir_parents(p, 0700);
- mkfifo(p, 0600);
-
- fd = open(p, O_RDONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
- free(p);
-
- if (fd < 0)
- return -errno;
-
- return fd;
-}
-
-static bool wall_tty_match(const char *path) {
- int fd, k;
- char *p;
- struct stat st;
-
- if (path_is_absolute(path))
- k = lstat(path, &st);
- else {
- if (asprintf(&p, "/dev/%s", path) < 0)
- return true;
-
- k = lstat(p, &st);
- free(p);
- }
-
- if (k < 0)
- return true;
-
- if (!S_ISCHR(st.st_mode))
- return true;
-
- /* We use named pipes to ensure that wall messages suggesting
- * password entry are not printed over password prompts
- * already shown. We use the fact here that opening a pipe in
- * non-blocking mode for write-only will succeed only if
- * there's some writer behind it. Using pipes has the
- * advantage that the block will automatically go away if the
- * process dies. */
-
- if (asprintf(&p, "/run/systemd/ask-password-block/%u:%u", major(st.st_rdev), minor(st.st_rdev)) < 0)
- return true;
-
- fd = open(p, O_WRONLY|O_CLOEXEC|O_NONBLOCK|O_NOCTTY);
- free(p);
-
- if (fd < 0)
- return true;
-
- /* What, we managed to open the pipe? Then this tty is filtered. */
- close_nointr_nofail(fd);
- return false;
-}
-
-static int show_passwords(void) {
- DIR *d;
- struct dirent *de;
- int r = 0;
-
- if (!(d = opendir("/run/systemd/ask-password"))) {
- if (errno == ENOENT)
- return 0;
-
- log_error("opendir(): %m");
- return -errno;
- }
-
- while ((de = readdir(d))) {
- char *p;
- int q;
- char *wall;
-
- /* We only support /dev on tmpfs, hence we can rely on
- * d_type to be reliable */
-
- if (de->d_type != DT_REG)
- continue;
-
- if (ignore_file(de->d_name))
- continue;
-
- if (!startswith(de->d_name, "ask."))
- continue;
-
- if (!(p = strappend("/run/systemd/ask-password/", de->d_name))) {
- log_error("Out of memory");
- r = -ENOMEM;
- goto finish;
- }
-
- wall = NULL;
- if ((q = parse_password(p, &wall)) < 0)
- r = q;
-
- free(p);
-
- if (wall) {
- utmp_wall(wall, wall_tty_match);
- free(wall);
- }
- }
-
-finish:
- if (d)
- closedir(d);
-
- return r;
-}
-
-static int watch_passwords(void) {
- enum {
- FD_INOTIFY,
- FD_SIGNAL,
- _FD_MAX
- };
-
- int notify = -1, signal_fd = -1, tty_block_fd = -1;
- struct pollfd pollfd[_FD_MAX];
- sigset_t mask;
- int r;
-
- tty_block_fd = wall_tty_block();
-
- mkdir_p("/run/systemd/ask-password", 0755);
-
- if ((notify = inotify_init1(IN_CLOEXEC)) < 0) {
- r = -errno;
- goto finish;
- }
-
- if (inotify_add_watch(notify, "/run/systemd/ask-password", IN_CLOSE_WRITE|IN_MOVED_TO) < 0) {
- r = -errno;
- goto finish;
- }
-
- assert_se(sigemptyset(&mask) == 0);
- sigset_add_many(&mask, SIGINT, SIGTERM, -1);
- assert_se(sigprocmask(SIG_SETMASK, &mask, NULL) == 0);
-
- if ((signal_fd = signalfd(-1, &mask, SFD_NONBLOCK|SFD_CLOEXEC)) < 0) {
- log_error("signalfd(): %m");
- r = -errno;
- goto finish;
- }
-
- zero(pollfd);
- pollfd[FD_INOTIFY].fd = notify;
- pollfd[FD_INOTIFY].events = POLLIN;
- pollfd[FD_SIGNAL].fd = signal_fd;
- pollfd[FD_SIGNAL].events = POLLIN;
-
- for (;;) {
- if ((r = show_passwords()) < 0)
- log_error("Failed to show password: %s", strerror(-r));
-
- if (poll(pollfd, _FD_MAX, -1) < 0) {
-
- if (errno == EINTR)
- continue;
-
- r = -errno;
- goto finish;
- }
-
- if (pollfd[FD_INOTIFY].revents != 0)
- flush_fd(notify);
-
- if (pollfd[FD_SIGNAL].revents != 0)
- break;
- }
-
- r = 0;
-
-finish:
- if (notify >= 0)
- close_nointr_nofail(notify);
-
- if (signal_fd >= 0)
- close_nointr_nofail(signal_fd);
-
- if (tty_block_fd >= 0)
- close_nointr_nofail(tty_block_fd);
-
- return r;
-}
-
-static int help(void) {
-
- printf("%s [OPTIONS...]\n\n"
- "Process system password requests.\n\n"
- " -h --help Show this help\n"
- " --list Show pending password requests\n"
- " --query Process pending password requests\n"
- " --watch Continuously process password requests\n"
- " --wall Continuously forward password requests to wall\n"
- " --plymouth Ask question with Plymouth instead of on TTY\n"
- " --console Ask question on /dev/console instead of current TTY\n",
- program_invocation_short_name);
-
- return 0;
-}
-
-static int parse_argv(int argc, char *argv[]) {
-
- enum {
- ARG_LIST = 0x100,
- ARG_QUERY,
- ARG_WATCH,
- ARG_WALL,
- ARG_PLYMOUTH,
- ARG_CONSOLE
- };
-
- static const struct option options[] = {
- { "help", no_argument, NULL, 'h' },
- { "list", no_argument, NULL, ARG_LIST },
- { "query", no_argument, NULL, ARG_QUERY },
- { "watch", no_argument, NULL, ARG_WATCH },
- { "wall", no_argument, NULL, ARG_WALL },
- { "plymouth", no_argument, NULL, ARG_PLYMOUTH },
- { "console", no_argument, NULL, ARG_CONSOLE },
- { NULL, 0, NULL, 0 }
- };
-
- int c;
-
- assert(argc >= 0);
- assert(argv);
-
- while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0) {
-
- 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();
-
- umask(0022);
-
- 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;
-}
~ianmdlvl / elogind.git / blobdiff