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scripts: add boot policy generation program

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Enables an IPE policy to be enforced from kernel start, enabling access
control based on trust from kernel startup. This is accomplished by
transforming an IPE policy indicated by CONFIG_IPE_BOOT_POLICY into a
c-string literal that is parsed at kernel startup as an unsigned policy.

Signed-off-by: Deven Bowers <deven.desai@linux.microsoft.com>
Signed-off-by: Fan Wu <wufan@linux.microsoft.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Deven Bowers
2024-08-02 23:08:31 -07:00
committed by Paul Moore
parent 31f8c8682f
commit ba199dc909
10 changed files with 198 additions and 0 deletions
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12
security/ipe/ipe.c
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@@ -9,6 +9,7 @@
#include "hooks.h"
#include "eval.h"
extern const char *const ipe_boot_policy;
bool ipe_enabled;
static struct lsm_blob_sizes ipe_blobs __ro_after_init = {
@@ -74,9 +75,20 @@ static struct security_hook_list ipe_hooks[] __ro_after_init = {
*/
static int __init ipe_init(void)
{
struct ipe_policy *p = NULL;
security_add_hooks(ipe_hooks, ARRAY_SIZE(ipe_hooks), &ipe_lsmid);
ipe_enabled = true;
if (ipe_boot_policy) {
p = ipe_new_policy(ipe_boot_policy, strlen(ipe_boot_policy),
NULL, 0);
if (IS_ERR(p))
return PTR_ERR(p);
rcu_assign_pointer(ipe_active_policy, p);
}
return 0;
}