1 files changed, 59 insertions, 0 deletions
diff --git a/src/shared/ask-password-agent.c b/src/shared/ask-password-agent.c
new file mode 100644
index 0000000000..75eaa46254
--- /dev/null
+++ b/src/shared/ask-password-agent.c
@@ -0,0 +1,59 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <signal.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "ask-password-agent.h"
+#include "exec-util.h"
+#include "log.h"
+#include "process-util.h"
+
+static pid_t agent_pid = 0;
+
+int ask_password_agent_open(void) {
+        int r;
+
+        if (agent_pid > 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;
+
+        r = fork_agent("(sd-askpwagent)",
+                       NULL, 0,
+                       &agent_pid,
+                       SYSTEMD_TTY_ASK_PASSWORD_AGENT_BINARY_PATH,
+                       SYSTEMD_TTY_ASK_PASSWORD_AGENT_BINARY_PATH, "--watch", NULL);
+        if (r < 0)
+                return log_error_errno(r, "Failed to fork TTY ask password agent: %m");
+
+        return 1;
+}
+
+void ask_password_agent_close(void) {
+
+        if (agent_pid <= 0)
+                return;
+
+        /* Inform agent that we are done */
+        sigterm_wait(TAKE_PID(agent_pid));
+}
+
+int ask_password_agent_open_if_enabled(BusTransport transport, bool ask_password) {
+
+        /* Open the ask password agent as a child process if necessary */
+
+        if (transport != BUS_TRANSPORT_LOCAL)
+                return 0;
+
+        if (!ask_password)
+                return 0;
+
+        return ask_password_agent_open();
+}