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/*
* lws-crypto-x509
*
* Written in 2010-2019 by Andy Green <andy@warmcat.com>
*
* This file is made available under the Creative Commons CC0 1.0
* Universal Public Domain Dedication.
*/
#include <libwebsockets.h>
#include <sys/types.h>
#include <fcntl.h>
#include <errno.h>
static int
read_pem(const char *filename, char *pembuf, int pembuf_len)
{
int n, fd = open(filename, LWS_O_RDONLY);
if (fd == -1)
return -1;
n = (int)read(fd, pembuf, (unsigned int)pembuf_len - 1);
close(fd);
pembuf[n++] = '\0';
return n;
}
static int
read_pem_c509_cert(struct lws_x509_cert **x509, const char *filename,
char *pembuf, int pembuf_len)
{
int n;
n = read_pem(filename, pembuf, pembuf_len);
if (n < 0)
return -1;
if (lws_x509_create(x509)) {
lwsl_err("%s: failed to create x509\n", __func__);
return -1;
}
if (lws_x509_parse_from_pem(*x509, pembuf, (unsigned int)n) < 0) {
lwsl_err("%s: unable to parse PEM %s\n", __func__, filename);
lws_x509_destroy(x509);
return -1;
}
return 0;
}
int main(int argc, const char **argv)
{
int n, result = 1, logs = LLL_USER | LLL_ERR | LLL_WARN | LLL_NOTICE;
struct lws_x509_cert *x509 = NULL, *x509_trusted = NULL;
struct lws_context_creation_info info;
struct lws_context *context;
struct lws_jwk jwk;
char pembuf[6144];
const char *p;
memset(&jwk, 0, sizeof(jwk));
if ((p = lws_cmdline_option(argc, argv, "-d")))
logs = atoi(p);
lws_set_log_level(logs, NULL);
lwsl_user("LWS X509 api example\n");
memset(&info, 0, sizeof info); /* otherwise uninitialized garbage */
#if defined(LWS_WITH_NETWORK)
info.port = CONTEXT_PORT_NO_LISTEN;
#endif
info.options = 0;
context = lws_create_context(&info);
if (!context) {
lwsl_err("lws init failed\n");
return 1;
}
p = lws_cmdline_option(argc, argv, "-c");
if (!p) {
lwsl_err("%s: missing -c <cert pem file>\n", __func__);
goto bail;
}
if (read_pem_c509_cert(&x509, p, pembuf, sizeof(pembuf))) {
lwsl_err("%s: unable to read \"%s\": errno %d\n",
__func__, p, errno);
goto bail;
}
p = lws_cmdline_option(argc, argv, "-t");
if (p) {
if (read_pem_c509_cert(&x509_trusted, p, pembuf,
sizeof(pembuf))) {
lwsl_err("%s: unable to read \"%s\": errno %d\n",
__func__, p, errno);
goto bail1;
}
lwsl_notice("%s: certs loaded OK\n", __func__);
if (lws_x509_verify(x509, x509_trusted, NULL)) {
lwsl_err("%s: verify failed\n", __func__);
goto bail2;
}
lwsl_notice("%s: verified OK\n", __func__);
}
if (x509_trusted) {
/* show the trusted cert public key as a JWK */
if (lws_x509_public_to_jwk(&jwk, x509_trusted,
"P-256,P-384,P-521", 4096)) {
lwsl_err("%s: unable to get trusted cert pubkey as JWK\n",
__func__);
goto bail2;
}
if ((p = lws_cmdline_option(argc, argv, "--alg")))
lws_jwk_strdup_meta(&jwk, JWK_META_ALG, p, (int)strlen(p));
lwsl_info("JWK version of trusted cert:\n");
lws_jwk_dump(&jwk);
lws_jwk_destroy(&jwk);
}
/* get the cert public key as a JWK */
if (lws_x509_public_to_jwk(&jwk, x509, "P-256,P-384,P-521", 4096)) {
lwsl_err("%s: unable to get cert pubkey as JWK\n", __func__);
goto bail3;
}
lwsl_info("JWK version of cert:\n");
if ((p = lws_cmdline_option(argc, argv, "--alg")))
lws_jwk_strdup_meta(&jwk, JWK_META_ALG, p, (int)strlen(p));
lws_jwk_dump(&jwk);
/* only print public if he doesn't provide private */
if (!lws_cmdline_option(argc, argv, "-p")) {
lwsl_notice("Issuing Cert Public JWK on stdout\n");
n = sizeof(pembuf);
if (lws_jwk_export(&jwk, 0, pembuf, &n))
puts(pembuf);
}
/* if we know where the cert private key is, add that to the cert JWK */
p = lws_cmdline_option(argc, argv, "-p");
if (p) {
n = read_pem(p, pembuf, sizeof(pembuf));
if (n < 0) {
lwsl_err("%s: unable read privkey %s\n", __func__, p);
goto bail3;
}
if (lws_x509_jwk_privkey_pem(context, &jwk, pembuf,
(unsigned int)n, NULL)) {
lwsl_err("%s: unable to parse privkey %s\n",
__func__, p);
goto bail3;
}
if ((p = lws_cmdline_option(argc, argv, "--alg")))
lws_jwk_strdup_meta(&jwk, JWK_META_ALG, p, (int)strlen(p));
lwsl_info("JWK version of cert + privkey:\n");
lws_jwk_dump(&jwk);
lwsl_notice("Issuing Cert + Private JWK on stdout\n");
n = sizeof(pembuf);
if (lws_jwk_export(&jwk, LWSJWKF_EXPORT_PRIVATE, pembuf, &n))
puts(pembuf);
}
result = 0;
bail3:
lws_jwk_destroy(&jwk);
bail2:
lws_x509_destroy(&x509_trusted);
bail1:
lws_x509_destroy(&x509);
bail:
lws_context_destroy(context);
if (result)
lwsl_err("%s: failed\n", __func__);
else
lwsl_notice("%s: OK\n", __func__);
return result;
}
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