test: add first autoboot unit tests

This adds tests for the crypt-based and plain SHA256-based password hashing
algorithms in the autoboot flow.

Signed-off-by: Steffen Jaeckel <jaeckel-floss@eyet-services.de>
Reviewed-by: Simon Glass <sjg@chromium.org>

test/common/Makefile

@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0+
+obj-y += cmd_ut_common.o
+obj-$(CONFIG_AUTOBOOT) += test_autoboot.o

test/common/cmd_ut_common.c

@@ -0,0 +1,22 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2019 Heinrich Schuchardt <xypron.glpk@gmx.de>
+ * Copyright (c) 2021 Steffen Jaeckel <jaeckel-floss@eyet-services.de>
+ *
+ * Unit tests for common functions
+ */
+
+#include <common.h>
+#include <command.h>
+#include <test/common.h>
+#include <test/suites.h>
+#include <test/ut.h>
+
+int do_ut_common(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
+{
+	struct unit_test *tests = UNIT_TEST_SUITE_START(common_test);
+	const int n_ents = UNIT_TEST_SUITE_COUNT(common_test);
+
+	return cmd_ut_category("common", "common_test_", tests, n_ents, argc,
+			       argv);
+}

test/common/test_autoboot.c

@@ -0,0 +1,90 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2021 Steffen Jaeckel
+ *
+ * Unit tests for autoboot functionality
+ */
+
+#include <autoboot.h>
+#include <common.h>
+#include <test/common.h>
+#include <test/test.h>
+#include <test/ut.h>
+
+#include <crypt.h>
+
+static int check_for_input(struct unit_test_state *uts, const char *in,
+			   bool correct)
+{
+	/* The bootdelay is set to 1 second in test_autoboot() */
+	const char *autoboot_prompt =
+		"Enter password \"a\" in 1 seconds to stop autoboot";
+
+	console_record_reset_enable();
+	console_in_puts(in);
+	autoboot_command("echo Autoboot password unlock not successful");
+	ut_assert_nextline(autoboot_prompt);
+	if (!correct)
+		ut_assert_nextline("Autoboot password unlock not successful");
+	ut_assert_console_end();
+	return 0;
+}
+
+/**
+ * test_autoboot() - unit test for autoboot
+ *
+ * @uts:	unit test state
+ * Return:	0 = success, 1 = failure
+ */
+static int test_autoboot(struct unit_test_state *uts)
+{
+	/* make sure that the bootdelay is set to something,
+	 * otherwise the called functions will time out
+	 */
+	ut_assertok(env_set("bootdelay", "1"));
+	bootdelay_process();
+
+	/* unset all relevant environment variables */
+	env_set("bootstopusesha256", NULL);
+	env_set("bootstopkeycrypt", NULL);
+	env_set("bootstopkeysha256", NULL);
+
+	if (IS_ENABLED(CONFIG_CRYPT_PW_SHA256)) {
+		/* test the default password from CONFIG_AUTOBOOT_STOP_STR_CRYPT */
+		ut_assertok(check_for_input(uts, "a\n", true));
+		/* test a password from the `bootstopkeycrypt` environment variable */
+		ut_assertok(env_set(
+			"bootstopkeycrypt",
+			"$5$rounds=640000$ycgRgpnRq4lmu.eb$aZ6YJWdklvyLML13w7mEHMHJnJOux6aptnp6VlsR5a9"));
+
+		ut_assertok(check_for_input(uts, "test\n", true));
+
+		/* verify that the `bootstopusesha256` variable is treated correctly */
+		ut_assertok(env_set("bootstopusesha256", "false"));
+		ut_assertok(check_for_input(uts, "test\n", true));
+	}
+
+	if (IS_ENABLED(CONFIG_AUTOBOOT_ENCRYPTION)) {
+		/* test the `bootstopusesha256` and `bootstopkeysha256` features */
+		ut_assertok(env_set("bootstopusesha256", "true"));
+		ut_assertok(env_set(
+			"bootstopkeysha256",
+			"edeaaff3f1774ad2888673770c6d64097e391bc362d7d6fb34982ddf0efd18cb"));
+
+		ut_assertok(check_for_input(uts, "abc\n", true));
+
+		ut_assertok(env_set(
+			"bootstopkeysha256",
+			"ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad"));
+
+		ut_assertok(check_for_input(uts, "abc", true));
+
+		ut_assertok(check_for_input(uts, "abc\n", true));
+
+		ut_assertok(check_for_input(uts, "abd", false));
+	}
+
+	return CMD_RET_SUCCESS;
+}
+
+COMMON_TEST(test_autoboot, 0);