modsign: Allow signing key to be PKCS#11

This is only the key; the corresponding *cert* still needs to be in
$(topdir)/signing_key.x509. And there's no way to actually use this
from the build system yet.

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: David Howells <dhowells@redhat.com>

diff --git a/scripts/sign-file.c b/scripts/sign-file.c
index 720b9bc933ae05123c95463f46294b6dba9437e0..ad0aa21bd3ac85b9ed34e5fe781e9b6fef9ee814 100755 (executable)
--- a/scripts/sign-file.c
+++ b/scripts/sign-file.c
@@ -22,6 +22,7 @@
 #include <openssl/pem.h>
 #include <openssl/pkcs7.h>
 #include <openssl/err.h>
+#include <openssl/engine.h>
 
 struct module_signature {
        uint8_t         algo;           /* Public-key crypto algorithm [0] */
@@ -154,11 +155,29 @@ int main(int argc, char **argv)
        /* Read the private key and the X.509 cert the PKCS#7 message
         * will point to.
         */
-       b = BIO_new_file(private_key_name, "rb");
-       ERR(!b, "%s", private_key_name);
-       private_key = PEM_read_bio_PrivateKey(b, NULL, pem_pw_cb, NULL);
-       ERR(!private_key, "%s", private_key_name);
-       BIO_free(b);
+       if (!strncmp(private_key_name, "pkcs11:", 7)) {
+               ENGINE *e;
+
+               ENGINE_load_builtin_engines();
+               drain_openssl_errors();
+               e = ENGINE_by_id("pkcs11");
+               ERR(!e, "Load PKCS#11 ENGINE");
+               if (ENGINE_init(e))
+                       drain_openssl_errors();
+               else
+                       ERR(1, "ENGINE_init");
+               if (key_pass)
+                       ERR(!ENGINE_ctrl_cmd_string(e, "PIN", key_pass, 0), "Set PKCS#11 PIN");
+               private_key = ENGINE_load_private_key(e, private_key_name, NULL,
+                                                     NULL);
+               ERR(!private_key, "%s", private_key_name);
+       } else {
+               b = BIO_new_file(private_key_name, "rb");
+               ERR(!b, "%s", private_key_name);
+               private_key = PEM_read_bio_PrivateKey(b, NULL, pem_pw_cb, NULL);
+               ERR(!private_key, "%s", private_key_name);
+               BIO_free(b);
+       }
 
        b = BIO_new_file(x509_name, "rb");
        ERR(!b, "%s", x509_name);