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-rw-r--r--security/selinux/ima.c120
1 files changed, 120 insertions, 0 deletions
diff --git a/security/selinux/ima.c b/security/selinux/ima.c
new file mode 100644
index 0000000000..aa34da9b0a
--- /dev/null
+++ b/security/selinux/ima.c
@@ -0,0 +1,120 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2021 Microsoft Corporation
+ *
+ * Author: Lakshmi Ramasubramanian (nramas@linux.microsoft.com)
+ *
+ * Measure critical data structures maintained by SELinux
+ * using IMA subsystem.
+ */
+#include <linux/vmalloc.h>
+#include <linux/ima.h>
+#include "security.h"
+#include "ima.h"
+
+/*
+ * selinux_ima_collect_state - Read selinux configuration settings
+ *
+ * On success returns the configuration settings string.
+ * On error, returns NULL.
+ */
+static char *selinux_ima_collect_state(void)
+{
+ const char *on = "=1;", *off = "=0;";
+ char *buf;
+ int buf_len, len, i, rc;
+
+ buf_len = strlen("initialized=0;enforcing=0;checkreqprot=0;") + 1;
+
+ len = strlen(on);
+ for (i = 0; i < __POLICYDB_CAP_MAX; i++)
+ buf_len += strlen(selinux_policycap_names[i]) + len;
+
+ buf = kzalloc(buf_len, GFP_KERNEL);
+ if (!buf)
+ return NULL;
+
+ rc = strscpy(buf, "initialized", buf_len);
+ WARN_ON(rc < 0);
+
+ rc = strlcat(buf, selinux_initialized() ? on : off, buf_len);
+ WARN_ON(rc >= buf_len);
+
+ rc = strlcat(buf, "enforcing", buf_len);
+ WARN_ON(rc >= buf_len);
+
+ rc = strlcat(buf, enforcing_enabled() ? on : off, buf_len);
+ WARN_ON(rc >= buf_len);
+
+ rc = strlcat(buf, "checkreqprot", buf_len);
+ WARN_ON(rc >= buf_len);
+
+ rc = strlcat(buf, checkreqprot_get() ? on : off, buf_len);
+ WARN_ON(rc >= buf_len);
+
+ for (i = 0; i < __POLICYDB_CAP_MAX; i++) {
+ rc = strlcat(buf, selinux_policycap_names[i], buf_len);
+ WARN_ON(rc >= buf_len);
+
+ rc = strlcat(buf, selinux_state.policycap[i] ? on : off,
+ buf_len);
+ WARN_ON(rc >= buf_len);
+ }
+
+ return buf;
+}
+
+/*
+ * selinux_ima_measure_state_locked - Measure SELinux state and hash of policy
+ */
+void selinux_ima_measure_state_locked(void)
+{
+ char *state_str = NULL;
+ void *policy = NULL;
+ size_t policy_len;
+ int rc = 0;
+
+ lockdep_assert_held(&selinux_state.policy_mutex);
+
+ state_str = selinux_ima_collect_state();
+ if (!state_str) {
+ pr_err("SELinux: %s: failed to read state.\n", __func__);
+ return;
+ }
+
+ ima_measure_critical_data("selinux", "selinux-state",
+ state_str, strlen(state_str), false,
+ NULL, 0);
+
+ kfree(state_str);
+
+ /*
+ * Measure SELinux policy only after initialization is completed.
+ */
+ if (!selinux_initialized())
+ return;
+
+ rc = security_read_state_kernel(&policy, &policy_len);
+ if (rc) {
+ pr_err("SELinux: %s: failed to read policy %d.\n", __func__, rc);
+ return;
+ }
+
+ ima_measure_critical_data("selinux", "selinux-policy-hash",
+ policy, policy_len, true,
+ NULL, 0);
+
+ vfree(policy);
+}
+
+/*
+ * selinux_ima_measure_state - Measure SELinux state and hash of policy
+ */
+void selinux_ima_measure_state(void)
+{
+ lockdep_assert_not_held(&selinux_state.policy_mutex);
+
+ mutex_lock(&selinux_state.policy_mutex);
+ selinux_ima_measure_state_locked();
+ mutex_unlock(&selinux_state.policy_mutex);
+}