certs/extract-cert.c

Source file repositories/reference/linux-study-clean/certs/extract-cert.c

File Facts

System
Linux kernel
Corpus path
certs/extract-cert.c
Extension
.c
Size
4295 bytes
Lines
185
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

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;
	char *verbose_env;

	OpenSSL_add_all_algorithms();
	ERR_load_crypto_strings();
	ERR_clear_error();

	verbose_env = getenv("KBUILD_VERBOSE");
	if (verbose_env && strchr(verbose_env, '1'))
		verbose = true;

#ifdef USE_PKCS11_ENGINE
	key_pass = getenv("KBUILD_SIGN_PIN");
#endif

	if (argc != 3)
		format();

	cert_src = argv[1];
	cert_dst = argv[2];

	if (!cert_src[0]) {
		/* Invoked with no input; create empty file */
		FILE *f = fopen(cert_dst, "wb");
		ERR(!f, "%s", cert_dst);
		fclose(f);
		exit(0);
	} else if (!strncmp(cert_src, "pkcs11:", 7)) {
		X509 *cert = load_cert_pkcs11(cert_src);

		ERR(!cert, "load_cert_pkcs11 failed");
		write_cert(cert);
	} else {
		BIO *b;
		X509 *x509;

		b = BIO_new_file(cert_src, "rb");
		ERR(!b, "%s", cert_src);

		while (1) {
			x509 = PEM_read_bio_X509(b, NULL, NULL, NULL);
			if (wb && !x509) {
				unsigned long err = ERR_peek_last_error();
				if (ERR_GET_LIB(err) == ERR_LIB_PEM &&
				    ERR_GET_REASON(err) == PEM_R_NO_START_LINE) {

Annotation

Implementation Notes