ima: define a set of appraisal rules requiring file signatures

The builtin "ima_appraise_tcb" policy should require file signatures for
at least a few of the hooks (eg. kernel modules, firmware, and the kexec
kernel image), but changing it would break the existing userspace/kernel
ABI.

This patch defines a new builtin policy named "secure_boot", which
can be specified on the "ima_policy=" boot command line, independently
or in conjunction with the "ima_appraise_tcb" policy, by specifing
ima_policy="appraise_tcb | secure_boot".  The new appraisal rules
requiring file signatures will be added prior to the "ima_appraise_tcb"
rules.

Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Changelog:
- Reference secure boot in the new builtin policy name. (Thiago Bauermann)

diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index 9b4381f..e438a1f 100644 (file)
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -1478,7 +1478,7 @@
 
        ima_policy=     [IMA]
                        The builtin policies to load during IMA setup.
-                       Format: "tcb | appraise_tcb"
+                       Format: "tcb | appraise_tcb | secure_boot"
 
                        The "tcb" policy measures all programs exec'd, files
                        mmap'd for exec, and all files opened with the read
@@ -1489,6 +1489,10 @@
                        all files owned by root. (This is the equivalent
                        of ima_appraise_tcb.)
 
+                       The "secure_boot" policy appraises the integrity
+                       of files (eg. kexec kernel image, kernel modules,
+                       firmware, policy, etc) based on file signatures.
+
        ima_tcb         [IMA] Deprecated.  Use ima_policy= instead.
                        Load a policy which meets the needs of the Trusted
                        Computing Base.  This means IMA will measure all

diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
index 0ddc413..3653c86 100644 (file)
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c
@@ -153,6 +153,17 @@ static struct ima_rule_entry default_appraise_rules[] __ro_after_init = {
 #endif
 };
 
+static struct ima_rule_entry secure_boot_rules[] __ro_after_init = {
+       {.action = APPRAISE, .func = MODULE_CHECK,
+        .flags = IMA_FUNC | IMA_DIGSIG_REQUIRED},
+       {.action = APPRAISE, .func = FIRMWARE_CHECK,
+        .flags = IMA_FUNC | IMA_DIGSIG_REQUIRED},
+       {.action = APPRAISE, .func = KEXEC_KERNEL_CHECK,
+        .flags = IMA_FUNC | IMA_DIGSIG_REQUIRED},
+       {.action = APPRAISE, .func = POLICY_CHECK,
+        .flags = IMA_FUNC | IMA_DIGSIG_REQUIRED},
+};
+
 static LIST_HEAD(ima_default_rules);
 static LIST_HEAD(ima_policy_rules);
 static LIST_HEAD(ima_temp_rules);
@@ -171,6 +182,7 @@ static int __init default_measure_policy_setup(char *str)
 __setup("ima_tcb", default_measure_policy_setup);
 
 static bool ima_use_appraise_tcb __initdata;
+static bool ima_use_secure_boot __initdata;
 static int __init policy_setup(char *str)
 {
        char *p;
@@ -182,6 +194,8 @@ static int __init policy_setup(char *str)
                        ima_policy = DEFAULT_TCB;
                else if (strcmp(p, "appraise_tcb") == 0)
                        ima_use_appraise_tcb = 1;
+               else if (strcmp(p, "secure_boot") == 0)
+                       ima_use_secure_boot = 1;
        }
 
        return 1;
@@ -410,12 +424,14 @@ void ima_update_policy_flag(void)
  */
 void __init ima_init_policy(void)
 {
-       int i, measure_entries, appraise_entries;
+       int i, measure_entries, appraise_entries, secure_boot_entries;
 
        /* if !ima_policy set entries = 0 so we load NO default rules */
        measure_entries = ima_policy ? ARRAY_SIZE(dont_measure_rules) : 0;
        appraise_entries = ima_use_appraise_tcb ?
                         ARRAY_SIZE(default_appraise_rules) : 0;
+       secure_boot_entries = ima_use_secure_boot ?
+                       ARRAY_SIZE(secure_boot_rules) : 0;
 
        for (i = 0; i < measure_entries; i++)
                list_add_tail(&dont_measure_rules[i].list, &ima_default_rules);
@@ -434,6 +450,14 @@ void __init ima_init_policy(void)
                break;
        }
 
+       /*
+        * Insert the appraise rules requiring file signatures, prior to
+        * any other appraise rules.
+        */
+       for (i = 0; i < secure_boot_entries; i++)
+               list_add_tail(&secure_boot_rules[i].list,
+                             &ima_default_rules);
+
        for (i = 0; i < appraise_entries; i++) {
                list_add_tail(&default_appraise_rules[i].list,
                              &ima_default_rules);