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-rw-r--r--src/tty-ask-password-agent.c356
1 files changed, 356 insertions, 0 deletions
diff --git a/src/tty-ask-password-agent.c b/src/tty-ask-password-agent.c
new file mode 100644
index 0000000000..9c4d076b31
--- /dev/null
+++ b/src/tty-ask-password-agent.c
@@ -0,0 +1,356 @@
+/*-*- 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 General Public License as published by
+ the Free Software Foundation; either version 2 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
+ General Public License for more details.
+
+ You should have received a copy of the GNU 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 "util.h"
+#include "conf-parser.h"
+#include "utmp-wtmp.h"
+
+static enum {
+ ACTION_LIST,
+ ACTION_QUERY,
+ ACTION_WATCH,
+ ACTION_WALL
+} arg_action = ACTION_QUERY;
+
+static int parse_password(const char *filename) {
+ char *socket_name = NULL, *message = NULL, *packet = NULL;
+ uint64_t not_after = 0;
+ unsigned pid = 0;
+ int socket_fd = -1;
+
+ const ConfigItem items[] = {
+ { "Socket", config_parse_string, &socket_name, "Ask" },
+ { "NotAfter", config_parse_uint64, &not_after, "Ask" },
+ { "Message", config_parse_string, &message, "Ask" },
+ { "PID", config_parse_unsigned, &pid, "Ask" },
+ };
+
+ FILE *f;
+ int r;
+ usec_t n;
+
+ assert(filename);
+
+ if (!(f = fopen(filename, "re"))) {
+
+ if (errno == ENOENT)
+ return 0;
+
+ log_error("open(%s): %m", filename);
+ return -errno;
+ }
+
+ if ((r = config_parse(filename, f, NULL, items, false, NULL)) < 0) {
+ log_error("Failed to parse password file %s: %s", filename, strerror(-r));
+ goto finish;
+ }
+
+ if (!socket_name || not_after <= 0) {
+ log_error("Invalid password file %s", filename);
+ r = -EBADMSG;
+ goto finish;
+ }
+
+ n = now(CLOCK_MONOTONIC);
+ if (n > not_after) {
+ 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,
+ "Password entry required for \'%s\' (PID %u).\r\n"
+ "Please enter password with the systemd-tty-password-agent tool!",
+ message,
+ pid) < 0) {
+ log_error("Out of memory");
+ r = -ENOMEM;
+ goto finish;
+ }
+
+ r = utmp_wall(wall);
+ free(wall);
+ } else {
+ union {
+ struct sockaddr sa;
+ struct sockaddr_un un;
+ } sa;
+ char *password;
+
+ 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 ((r = ask_password_tty(message, not_after, filename, &password)) < 0) {
+ log_error("Failed to query passwords: %s", strerror(-r));
+ goto finish;
+ }
+
+ asprintf(&packet, "+%s", password);
+ free(password);
+
+ if (!packet) {
+ log_error("Out of memory");
+ r = -ENOMEM;
+ 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, strlen(packet), 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 show_passwords(void) {
+ DIR *d;
+ struct dirent *de;
+ int r = 0;
+
+ if (!(d = opendir("/dev/.systemd/ask-password"))) {
+ if (errno == ENOENT)
+ return 0;
+
+ log_error("opendir(): %m");
+ return -errno;
+ }
+
+ while ((de = readdir(d))) {
+ char *p;
+ int q;
+
+ if (de->d_type != DT_REG)
+ continue;
+
+ if (ignore_file(de->d_name))
+ continue;
+
+ if (!startswith(de->d_name, "ask."))
+ continue;
+
+ if (!(p = strappend("/dev/.systemd/ask-password/", de->d_name))) {
+ log_error("Out of memory");
+ r = -ENOMEM;
+ goto finish;
+ }
+
+ if ((q = parse_password(p)) < 0)
+ r = q;
+
+ free(p);
+ }
+
+finish:
+ if (d)
+ closedir(d);
+
+ return r;
+}
+
+static int watch_passwords(void) {
+ int notify;
+ struct pollfd pollfd;
+ int r;
+
+ mkdir_p("/dev/.systemd/ask-password", 0755);
+
+ if ((notify = inotify_init1(IN_CLOEXEC)) < 0) {
+ r = -errno;
+ goto finish;
+ }
+
+ if (inotify_add_watch(notify, "/dev/.systemd/ask-password", IN_CLOSE_WRITE|IN_MOVED_TO) < 0) {
+ r = -errno;
+ goto finish;
+ }
+
+ zero(pollfd);
+ pollfd.fd = notify;
+ pollfd.events = POLLIN;
+
+ for (;;) {
+ if ((r = show_passwords()) < 0)
+ break;
+
+ if (poll(&pollfd, 1, -1) < 0) {
+
+ if (errno == EINTR)
+ continue;
+
+ r = -errno;
+ goto finish;
+ }
+
+ if (pollfd.revents != 0)
+ flush_fd(notify);
+ }
+
+ r = 0;
+
+finish:
+ if (notify >= 0)
+ close_nointr_nofail(notify);
+
+ 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 Continously process password requests\n"
+ " --wall Continously forward password requests to wall\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,
+ };
+
+ 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 },
+ { 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 '?':
+ 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_action == ACTION_WATCH ||
+ arg_action == ACTION_WALL)
+ r = watch_passwords();
+ else
+ r = show_passwords();
+
+finish:
+ return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
+}