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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>
This commit is contained in:
David Woodhouse 2015-07-20 21:16:33 +01:00 committed by David Howells
parent ed8c20762a
commit 84706caae9
1 changed files with 46 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

58
scripts/extract-cert.c
View File

@ -73,17 +73,34 @@ static void drain_openssl_errors(void)
} 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 @@ int main(int argc, char **argv)
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 @@ int main(int argc, char **argv)
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;
}