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/* SPDX-License-Identifier: LGPL-2.1+ */
/***
This file is part of systemd.
Copyright 2011 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 <errno.h>
#include <poll.h>
#include <signal.h>
#include <stdlib.h>
#include <unistd.h>
#include "fd-util.h"
#include "io-util.h"
#include "log.h"
#include "macro.h"
#include "process-util.h"
#include "spawn-polkit-agent.h"
#include "stdio-util.h"
#include "time-util.h"
#include "util.h"
#if ENABLE_POLKIT
static pid_t agent_pid = 0;
int polkit_agent_open(void) {
int r;
int pipe_fd[2];
char notify_fd[DECIMAL_STR_MAX(int) + 1];
if (agent_pid > 0)
return 0;
/* Clients that run as root don't need to activate/query polkit */
if (geteuid() == 0)
return 0;
/* We check STDIN here, not STDOUT, since this is about input,
* not output */
if (!isatty(STDIN_FILENO))
return 0;
if (pipe2(pipe_fd, 0) < 0)
return -errno;
xsprintf(notify_fd, "%i", pipe_fd[1]);
r = fork_agent(&agent_pid,
&pipe_fd[1], 1,
POLKIT_AGENT_BINARY_PATH,
POLKIT_AGENT_BINARY_PATH, "--notify-fd", notify_fd, "--fallback", NULL);
/* Close the writing side, because that's the one for the agent */
safe_close(pipe_fd[1]);
if (r < 0)
log_error_errno(r, "Failed to fork TTY ask password agent: %m");
else
/* Wait until the agent closes the fd */
fd_wait_for_event(pipe_fd[0], POLLHUP, USEC_INFINITY);
safe_close(pipe_fd[0]);
return r;
}
void polkit_agent_close(void) {
if (agent_pid <= 0)
return;
/* Inform agent that we are done */
(void) kill(agent_pid, SIGTERM);
(void) kill(agent_pid, SIGCONT);
(void) wait_for_terminate(agent_pid, NULL);
agent_pid = 0;
}
#else
int polkit_agent_open(void) {
return 0;
}
void polkit_agent_close(void) {
}
#endif
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