[image] Allow "imgtrust" to automatically download cross-signed certificates

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/usr/imgtrust.c

 #include <ipxe/uaccess.h>
 #include <ipxe/image.h>
 #include <ipxe/cms.h>
+#include <ipxe/validator.h>
+#include <ipxe/monojob.h>
 #include <usr/imgtrust.h>
 
 /** @file
 	size_t len;
 	void *data;
 	struct cms_signature *sig;
+	struct cms_signer_info *info;
 	time_t now;
 	int rc;
 
 	free ( data );
 	data = NULL;
 
+	/* Complete all certificate chains */
+	list_for_each_entry ( info, &sig->info, list ) {
+		if ( ( rc = create_validator ( &monojob, info->chain ) ) != 0 )
+			goto err_create_validator;
+		if ( ( rc = monojob_wait ( NULL ) ) != 0 )
+			goto err_validator_wait;
+	}
+
 	/* Use signature to verify image */
 	now = time ( NULL );
 	if ( ( rc = cms_verify ( sig, image->data, image->len,
 	return 0;
 
  err_verify:
+ err_validator_wait:
+ err_create_validator:
 	cms_put ( sig );
  err_parse:
 	free ( data );