extract-cert: Cope with multiple X.509 certificates in a single file
This is not required for the module signing key, although it doesn't do any
harm — it just means that any additional certs in the PEM file are also
trusted by the kernel.
But it does allow us to use the extract-cert tool for processing the extra
certs from CONFIG_SYSTEM_TRUSTED_KEYS, instead of that horrid awk|base64
hack.
Also cope with being invoked with no input file, creating an empty output
file as a result.
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: David Howells <dhowells@redhat.com>
diff --git a/scripts/extract-cert.c b/scripts/extract-cert.c
index 4fd5b2f..fd0db01 100644
--- a/scripts/extract-cert.c
+++ b/scripts/extract-cert.c
@@ -73,17 +73,34 @@
} while(0)
static const char *key_pass;
+static BIO *wb;
+static char *cert_dst;
+int kbuild_verbose;
+
+static void write_cert(X509 *x509)
+{
+ char buf[200];
+
+ if (!wb) {
+ wb = BIO_new_file(cert_dst, "wb");
+ ERR(!wb, "%s", cert_dst);
+ }
+ X509_NAME_oneline(X509_get_subject_name(x509), buf, sizeof(buf));
+ ERR(!i2d_X509_bio(wb, x509), cert_dst);
+ if (kbuild_verbose)
+ fprintf(stderr, "Extracted cert: %s\n", buf);
+}
int main(int argc, char **argv)
{
- char *cert_src, *cert_dst;
- X509 *x509;
- BIO *b;
+ char *cert_src;
OpenSSL_add_all_algorithms();
ERR_load_crypto_strings();
ERR_clear_error();
+ kbuild_verbose = atoi(getenv("KBUILD_VERBOSE")?:"0");
+
key_pass = getenv("KBUILD_SIGN_PIN");
if (argc != 3)
@@ -92,7 +109,13 @@
cert_src = argv[1];
cert_dst = argv[2];
- if (!strncmp(cert_src, "pkcs11:", 7)) {
+ 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)) {
ENGINE *e;
struct {
const char *cert_id;
@@ -114,19 +137,30 @@
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");
- x509 = parms.cert;
+ write_cert(parms.cert);
} else {
+ BIO *b;
+ X509 *x509;
+
b = BIO_new_file(cert_src, "rb");
ERR(!b, "%s", cert_src);
- x509 = PEM_read_bio_X509(b, NULL, NULL, NULL);
- ERR(!x509, "%s", cert_src);
- BIO_free(b);
+
+ 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) {
+ ERR_clear_error();
+ break;
+ }
+ }
+ ERR(!x509, "%s", cert_src);
+ write_cert(x509);
+ }
}
- b = BIO_new_file(cert_dst, "wb");
- ERR(!b, "%s", cert_dst);
- ERR(!i2d_X509_bio(b, x509), cert_dst);
- BIO_free(b);
+ BIO_free(wb);
return 0;
}