sign-file,extract-cert: use pkcs11 provider for OPENSSL MAJOR >= 3

ENGINE API has been deprecated since OpenSSL version 3.0 [1].
Distros have started dropping support from headers and in future
it will likely disappear also from library.

It has been superseded by the PROVIDER API, so use it instead
for OPENSSL MAJOR >= 3.

[1] https://github.com/openssl/openssl/blob/master/README-ENGINES.md

[jarkko: fixed up alignment issues reported by checkpatch.pl --strict]

Signed-off-by: Jan Stancek <jstancek@redhat.com>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Tested-by: R Nageswara Sastry <rnsastry@linux.ibm.com>
Reviewed-by: Neal Gompa <neal@gompa.dev>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>

1 files changed, 73 insertions, 30 deletions

diff --git a/certs/extract-cert.c b/certs/extract-cert.c
index 61bbe0085671..7d6d468ed612 100644
--- a/certs/extract-cert.c
+++ b/certs/extract-cert.c
@@ -21,17 +21,18 @@
 #include <openssl/bio.h>
 #include <openssl/pem.h>
 #include <openssl/err.h>
-#include <openssl/engine.h>
-
+#if OPENSSL_VERSION_MAJOR >= 3
+# define USE_PKCS11_PROVIDER
+# include <openssl/provider.h>
+# include <openssl/store.h>
+#else
+# if !defined(OPENSSL_NO_ENGINE) && !defined(OPENSSL_NO_DEPRECATED_3_0)
+#  define USE_PKCS11_ENGINE
+#  include <openssl/engine.h>
+# endif
+#endif
 #include "ssl-common.h"
 
-/*
- * OpenSSL 3.0 deprecates the OpenSSL's ENGINE API.
- *
- * Remove this if/when that API is no longer used
- */
-#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
-
 #define PKEY_ID_PKCS7 2
 
 static __attribute__((noreturn))
@@ -61,6 +62,66 @@ static void write_cert(X509 *x509)
 		fprintf(stderr, "Extracted cert: %s\n", buf);
 }
 
+static X509 *load_cert_pkcs11(const char *cert_src)
+{
+	X509 *cert = NULL;
+#ifdef USE_PKCS11_PROVIDER
+	OSSL_STORE_CTX *store;
+
+	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);
+	ERR(!store, "OSSL_STORE_open");
+
+	while (!OSSL_STORE_eof(store)) {
+		OSSL_STORE_INFO *info = OSSL_STORE_load(store);
+
+		if (!info) {
+			drain_openssl_errors(__LINE__, 0);
+			continue;
+		}
+		if (OSSL_STORE_INFO_get_type(info) == OSSL_STORE_INFO_CERT) {
+			cert = OSSL_STORE_INFO_get1_CERT(info);
+			ERR(!cert, "OSSL_STORE_INFO_get1_CERT");
+		}
+		OSSL_STORE_INFO_free(info);
+		if (cert)
+			break;
+	}
+	OSSL_STORE_close(store);
+#elif defined(USE_PKCS11_ENGINE)
+		ENGINE *e;
+		struct {
+			const char *cert_id;
+			X509 *cert;
+		} parms;
+
+		parms.cert_id = cert_src;
+		parms.cert = NULL;
+
+		ENGINE_load_builtin_engines();
+		drain_openssl_errors(__LINE__, 1);
+		e = ENGINE_by_id("pkcs11");
+		ERR(!e, "Load PKCS#11 ENGINE");
+		if (ENGINE_init(e))
+			drain_openssl_errors(__LINE__, 1);
+		else
+			ERR(1, "ENGINE_init");
+		if (key_pass)
+			ERR(!ENGINE_ctrl_cmd_string(e, "PIN", key_pass, 0), "Set PKCS#11 PIN");
+		ENGINE_ctrl_cmd(e, "LOAD_CERT_CTRL", 0, &parms, NULL, 1);
+		ERR(!parms.cert, "Get X.509 from PKCS#11");
+		cert = parms.cert;
+#else
+		fprintf(stderr, "no pkcs11 engine/provider available\n");
+		exit(1);
+#endif
+	return cert;
+}
+
 int main(int argc, char **argv)
 {
 	char *cert_src;
@@ -89,28 +150,10 @@ int main(int argc, char **argv)
 		fclose(f);
 		exit(0);
 	} else if (!strncmp(cert_src, "pkcs11:", 7)) {
-		ENGINE *e;
-		struct {
-			const char *cert_id;
-			X509 *cert;
-		} parms;
+		X509 *cert = load_cert_pkcs11(cert_src);
 
-		parms.cert_id = cert_src;
-		parms.cert = NULL;
-
-		ENGINE_load_builtin_engines();
-		drain_openssl_errors(__LINE__, 1);
-		e = ENGINE_by_id("pkcs11");
-		ERR(!e, "Load PKCS#11 ENGINE");
-		if (ENGINE_init(e))
-			drain_openssl_errors(__LINE__, 1);
-		else
-			ERR(1, "ENGINE_init");
-		if (key_pass)
-			ERR(!ENGINE_ctrl_cmd_string(e, "PIN", key_pass, 0), "Set PKCS#11 PIN");
-		ENGINE_ctrl_cmd(e, "LOAD_CERT_CTRL", 0, &parms, NULL, 1);
-		ERR(!parms.cert, "Get X.509 from PKCS#11");
-		write_cert(parms.cert);
+		ERR(!cert, "load_cert_pkcs11 failed");
+		write_cert(cert);
 	} else {
 		BIO *b;
 		X509 *x509;