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From b429ea18b1c9c8953df5169c6a453b4255a6f23d Mon Sep 17 00:00:00 2001
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From: Iker Pedrosa <ikerpedrosam@gmail.com>
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Date: Thu, 27 Feb 2020 11:48:47 +0100
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Subject: [PATCH] pam_tty_audit: if kernel audit is disabled return PAM_IGNORE
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If kernel audit is disabled the socket open will return
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EPROTONOSUPPORT.
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Return PAM_IGNORE from pam_tty_audit and log a warning
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in this situation so login is not blocked by the module.
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---
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modules/pam_tty_audit/pam_tty_audit.c | 8 ++++++++
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1 file changed, 8 insertions(+)
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diff --git a/modules/pam_tty_audit/pam_tty_audit.c b/modules/pam_tty_audit/pam_tty_audit.c
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index 7dbcada2..589c60a2 100644
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--- a/modules/pam_tty_audit/pam_tty_audit.c
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+++ b/modules/pam_tty_audit/pam_tty_audit.c
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@@ -351,6 +351,14 @@ pam_sm_open_session (pam_handle_t *pamh, int flags, int argc, const char **argv)
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fd = nl_open ();
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if (fd == -1
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+ && errno == EPROTONOSUPPORT)
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+ {
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+ pam_syslog (pamh, LOG_WARNING, "unable to open audit socket, audit not "
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+ "supported; tty_audit skipped");
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+ free (old_status);
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+ return PAM_IGNORE;
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+ }
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+ else if (fd == -1
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|| nl_send (fd, AUDIT_TTY_GET, 0, NULL, 0) != 0
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|| nl_recv (fd, AUDIT_TTY_GET, old_status, sizeof (*old_status)) != 0)
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{
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--
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2.25.2
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