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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <errno.h>
#include <poll.h>
#include <signal.h>
#include <stdlib.h>
#include <unistd.h>
#include "exec-util.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"
#if ENABLE_POLKIT
static pid_t agent_pid = 0;
int polkit_agent_open(void) {
char notify_fd[DECIMAL_STR_MAX(int) + 1];
int pipe_fd[2], r;
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 (!is_main_thread())
return -EPERM;
if (pipe2(pipe_fd, 0) < 0)
return -errno;
xsprintf(notify_fd, "%i", pipe_fd[1]);
r = fork_agent("(polkit-agent)",
&pipe_fd[1], 1,
&agent_pid,
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 */
(void) 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 */
sigterm_wait(TAKE_PID(agent_pid));
}
#else
int polkit_agent_open(void) {
return 0;
}
void polkit_agent_close(void) {
}
#endif
int polkit_agent_open_if_enabled(BusTransport transport, bool ask_password) {
/* Open the polkit agent as a child process if necessary */
if (transport != BUS_TRANSPORT_LOCAL)
return 0;
if (!ask_password)
return 0;
return polkit_agent_open();
}
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