[PATCHv2] sign-file,extract-cert: use KBUILD_SIGN_PIN in provider mode

[Anton Lundin <glance@ac2.se>]

This adds support for the documented KBUILD_SIGN_PIN functionality to
sign-file and extract-cert when built with USE_PKCS11_PROVIDER.

Signed-off-by: Anton Lundin <glance@ac2.se>
Fixes: 558bdc45dfb2 ("sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3")
Cc: stable@vger.kernel.org
---
 certs/extract-cert.c | 27 ++++++++++++++++++++++++++-
 scripts/sign-file.c  |  6 +++++-
 2 files changed, 31 insertions(+), 2 deletions(-)

v2: Added the corresponding fix to extract-cert to

diff --git a/certs/extract-cert.c b/certs/extract-cert.c
index 7d6d468ed612..30afdc296fff 100644
--- a/certs/extract-cert.c
+++ b/certs/extract-cert.c
@@ -25,6 +25,7 @@
 # define USE_PKCS11_PROVIDER
 # include <openssl/provider.h>
 # include <openssl/store.h>
+# include <openssl/ui.h>
 #else
 # if !defined(OPENSSL_NO_ENGINE) && !defined(OPENSSL_NO_DEPRECATED_3_0)
 #  define USE_PKCS11_ENGINE
@@ -62,18 +63,42 @@ static void write_cert(X509 *x509)
 		fprintf(stderr, "Extracted cert: %s\n", buf);
 }
 
+#ifdef USE_PKCS11_PROVIDER
+static int pem_pw_cb(char *buf, int len, int w, void *v)
+{
+	int pwlen;
+
+	if (!key_pass)
+		return -1;
+
+	pwlen = strlen(key_pass);
+	if (pwlen >= len)
+		return -1;
+
+	strcpy(buf, key_pass);
+
+	/* If it's wrong, don't keep trying it. */
+	key_pass = NULL;
+
+	return pwlen;
+}
+#endif
+
 static X509 *load_cert_pkcs11(const char *cert_src)
 {
 	X509 *cert = NULL;
 #ifdef USE_PKCS11_PROVIDER
 	OSSL_STORE_CTX *store;
+	UI_METHOD *ui_method = NULL;
 
 	if (!OSSL_PROVIDER_try_load(NULL, "pkcs11", true))
 		ERR(1, "OSSL_PROVIDER_try_load(pkcs11)");
 	if (!OSSL_PROVIDER_try_load(NULL, "default", true))
 		ERR(1, "OSSL_PROVIDER_try_load(default)");
 
-	store = OSSL_STORE_open(cert_src, NULL, NULL, NULL, NULL);
+	if (key_pass)
+		ui_method = UI_UTIL_wrap_read_pem_callback(pem_pw_cb, 0);
+	store = OSSL_STORE_open(cert_src, ui_method, NULL, NULL, NULL);
 	ERR(!store, "OSSL_STORE_open");
 
 	while (!OSSL_STORE_eof(store)) {
diff --git a/scripts/sign-file.c b/scripts/sign-file.c
index 73fbefd2e540..9ac89fea9d73 100644
--- a/scripts/sign-file.c
+++ b/scripts/sign-file.c
@@ -32,6 +32,7 @@
 # define USE_PKCS11_PROVIDER
 # include <openssl/provider.h>
 # include <openssl/store.h>
+# include <openssl/ui.h>
 #else
 # if !defined(OPENSSL_NO_ENGINE) && !defined(OPENSSL_NO_DEPRECATED_3_0)
 #  define USE_PKCS11_ENGINE
@@ -90,13 +91,16 @@ static EVP_PKEY *read_private_key_pkcs11(const char *private_key_name)
 	EVP_PKEY *private_key = NULL;
 #ifdef USE_PKCS11_PROVIDER
 	OSSL_STORE_CTX *store;
+	UI_METHOD *ui_method = NULL;
 
 	if (!OSSL_PROVIDER_try_load(NULL, "pkcs11", true))
 		ERR(1, "OSSL_PROVIDER_try_load(pkcs11)");
 	if (!OSSL_PROVIDER_try_load(NULL, "default", true))
 		ERR(1, "OSSL_PROVIDER_try_load(default)");
 
-	store = OSSL_STORE_open(private_key_name, NULL, NULL, NULL, NULL);
+	if (key_pass)
+		ui_method = UI_UTIL_wrap_read_pem_callback(pem_pw_cb, 0);
+	store = OSSL_STORE_open(private_key_name, ui_method, NULL, NULL, NULL);
 	ERR(!store, "OSSL_STORE_open");
 
 	while (!OSSL_STORE_eof(store)) {
-- 
2.47.3