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From 8eaf5570cf011148a0b55c53570df5edaafebdb0 Mon Sep 17 00:00:00 2001
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From: Robert Fairley <rfairley@users.noreply.github.com>
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Date: Wed, 21 Nov 2018 02:46:02 -0500
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Subject: [PATCH] pam_motd: Fix segmentation fault when no motd_dir specified
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(#76)
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This fixes a regression introduced by #69, where motd_path was set
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to NULL and passed into strdup() if the motd_dir argument was
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not specified in the configuration file. This caused a segmentation
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fault.
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* modules/pam_motd/pam_motd.c: fix checks for NULL in arguments
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* xtests/Makefile.am: add test scripts and config file
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* xtests/tst-pam_motd.sh: add running tst-pam_motd4.sh
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* xtests/tst-pam_motd4.pamd: create
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* xtests/tst-pam_motd4.sh: create
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---
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modules/pam_motd/pam_motd.c | 15 ++++++++++-----
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xtests/Makefile.am | 4 ++--
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xtests/tst-pam_motd.sh | 1 +
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xtests/tst-pam_motd4.pamd | 3 +++
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xtests/tst-pam_motd4.sh | 27 +++++++++++++++++++++++++++
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5 files changed, 43 insertions(+), 7 deletions(-)
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create mode 100644 xtests/tst-pam_motd4.pamd
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create mode 100755 xtests/tst-pam_motd4.sh
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diff --git a/modules/pam_motd/pam_motd.c b/modules/pam_motd/pam_motd.c
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index 1c1cfcfa..ec3ebd58 100644
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--- a/modules/pam_motd/pam_motd.c
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+++ b/modules/pam_motd/pam_motd.c
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@@ -132,7 +132,6 @@ static int pam_split_string(const pam_handle_t *pamh, char *arg, char delim,
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goto out;
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}
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-
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arg_extracted = strtok_r(arg, delim_str, &arg;;
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while (arg_extracted != NULL && i < num_strs) {
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arg_split[i++] = arg_extracted;
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@@ -363,15 +362,21 @@ int pam_sm_open_session(pam_handle_t *pamh, int flags,
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motd_dir_path = default_motd_dir;
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}
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- motd_path_copy = strdup(motd_path);
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+ if (motd_path != NULL) {
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+ motd_path_copy = strdup(motd_path);
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+ }
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+
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if (motd_path_copy != NULL) {
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- if (pam_split_string(pamh, motd_path_copy, ':', &motd_path_split,
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- &num_motd_paths) == 0) {
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+ if (pam_split_string(pamh, motd_path_copy, ':',
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+ &motd_path_split, &num_motd_paths) == 0) {
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goto out;
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}
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}
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- motd_dir_path_copy = strdup(motd_dir_path);
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+ if (motd_dir_path != NULL) {
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+ motd_dir_path_copy = strdup(motd_dir_path);
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+ }
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+
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if (motd_dir_path_copy != NULL) {
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if (pam_split_string(pamh, motd_dir_path_copy, ':',
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&motd_dir_path_split, &num_motd_dir_paths) == 0) {
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diff --git a/xtests/Makefile.am b/xtests/Makefile.am
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index 555d5e33..4d5aba3d 100644
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--- a/xtests/Makefile.am
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+++ b/xtests/Makefile.am
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@@ -34,8 +34,8 @@ EXTRA_DIST = run-xtests.sh tst-pam_dispatch1.pamd tst-pam_dispatch2.pamd \
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tst-pam_pwhistory1.pamd tst-pam_pwhistory1.sh \
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tst-pam_time1.pamd time.conf \
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tst-pam_motd.sh tst-pam_motd1.sh tst-pam_motd2.sh \
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- tst-pam_motd3.sh tst-pam_motd1.pamd \
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- tst-pam_motd2.pamd tst-pam_motd3.pamd
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+ tst-pam_motd3.sh tst-pam_motd4.sh tst-pam_motd1.pamd \
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+ tst-pam_motd2.pamd tst-pam_motd3.pamd tst-pam_motd4.pamd
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XTESTS = tst-pam_dispatch1 tst-pam_dispatch2 tst-pam_dispatch3 \
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tst-pam_dispatch4 tst-pam_dispatch5 \
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diff --git a/xtests/tst-pam_motd.sh b/xtests/tst-pam_motd.sh
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index 9b0c38f6..90801280 100755
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--- a/xtests/tst-pam_motd.sh
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+++ b/xtests/tst-pam_motd.sh
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@@ -5,3 +5,4 @@ set -e
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./tst-pam_motd1.sh
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./tst-pam_motd2.sh
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./tst-pam_motd3.sh
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+./tst-pam_motd4.sh
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diff --git a/xtests/tst-pam_motd4.pamd b/xtests/tst-pam_motd4.pamd
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new file mode 100644
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index 00000000..9dc311ad
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--- /dev/null
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+++ b/xtests/tst-pam_motd4.pamd
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@@ -0,0 +1,3 @@
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+#%PAM-1.0
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+session required pam_permit.so
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+session optional pam_motd.so motd=tst-pam_motd4.d/etc/motd
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diff --git a/xtests/tst-pam_motd4.sh b/xtests/tst-pam_motd4.sh
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new file mode 100755
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index 00000000..6022177f
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--- /dev/null
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+++ b/xtests/tst-pam_motd4.sh
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@@ -0,0 +1,27 @@
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+#!/bin/bash
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+
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+TST_DIR="tst-pam_motd4.d"
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+
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+function tst_cleanup() {
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+ rm -rf "${TST_DIR}"
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+ rm -f tst-pam_motd4.out
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+}
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+
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+mkdir -p ${TST_DIR}/etc
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+
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+# Verify the case of single motd with no motd_dir given in tst-pam_motd4.pamd
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+echo "motd: /etc/motd" > ${TST_DIR}/etc/motd
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+
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+./tst-pam_motd tst-pam_motd4 > tst-pam_motd4.out
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+
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+RET=$?
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+
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+motd_to_show_output=$(cat tst-pam_motd4.out | grep "motd: /etc/motd")
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+if [ -z "${motd_to_show_output}" ];
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+then
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+ tst_cleanup
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+ exit 1
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+fi
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+
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+tst_cleanup
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+exit $RET
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--
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2.35.1
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