/*
* Copyright (C) 2011-2014 Free Software Foundation, Inc.
* Copyright (C) 2016-2017 Red Hat, Inc.
*
* This file is part of GnuTLS.
*
* GnuTLS is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GnuTLS is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see
* <https://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <gnutls/gnutls.h>
#include <gnutls/ocsp.h>
#include <gnutls/x509.h>
#include <gnutls/crypto.h>
#include <unistd.h> /* getpass */
/* Gnulib portability files. */
#include <read-file.h>
#include <socket.h>
#include <minmax.h>
#include <ocsptool-common.h>
#include <ocsptool-args.h>
#include "certtool-common.h"
FILE *outfile;
static unsigned int incert_format, outcert_format;
static const char *outfile_name = NULL; /* to delete on exit */
FILE *infile;
static unsigned int encoding;
unsigned int verbose = 0;
static unsigned int vflags = 0;
const char *get_pass(void)
{
return getpass("Enter password: ");
}
const char *get_confirmed_pass(bool ign)
{
return getpass("Enter password: ");
}
void app_exit(int val)
{
if (val != 0) {
if (outfile_name)
(void)remove(outfile_name);
}
exit(val);
}
static void tls_log_func(int level, const char *str)
{
fprintf(stderr, "|<%d>| %s", level, str);
}
gnutls_session_t init_tls_session(const char *host)
{
return NULL;
}
int do_handshake(socket_st * socket)
{
return -1;
}
static void request_info(void)
{
gnutls_ocsp_req_t req;
int ret;
gnutls_datum_t dat, rbuf;
size_t size;
ret = gnutls_ocsp_req_init(&req);
if (ret < 0) {
fprintf(stderr, "ocsp_req_init: %s\n", gnutls_strerror(ret));
app_exit(1);
}
if (HAVE_OPT(LOAD_REQUEST))
dat.data =
(void *) read_file(OPT_ARG(LOAD_REQUEST), RF_BINARY, &size);
else
dat.data = (void *) fread_file(infile, 0, &size);
if (dat.data == NULL) {
fprintf(stderr, "error reading request\n");
app_exit(1);
}
dat.size = size;
ret = gnutls_ocsp_req_import(req, &dat);
free(dat.data);
if (ret < 0) {
fprintf(stderr, "error importing request: %s\n",
gnutls_strerror(ret));
app_exit(1);
}
ret = gnutls_ocsp_req_print(req, GNUTLS_OCSP_PRINT_FULL, &dat);
if (ret != 0) {
fprintf(stderr, "ocsp_req_print: %s\n",
gnutls_strerror(ret));
app_exit(1);
}
if (HAVE_OPT(OUTFILE)) {
ret = gnutls_ocsp_req_export(req, &rbuf);
if (ret < 0) {
fprintf(stderr, "error exporting request: %s\n",
gnutls_strerror(ret));
app_exit(1);
}
if (outcert_format == GNUTLS_X509_FMT_PEM) {
fprintf(stderr, "Cannot export requests into PEM form\n");
app_exit(1);
} else {
fwrite(rbuf.data, 1, rbuf.size, outfile);
}
gnutls_free(rbuf.data);
} else {
printf("%.*s", dat.size, dat.data);
}
gnutls_free(dat.data);
gnutls_ocsp_req_deinit(req);
}
static void _response_info(const gnutls_datum_t * data, unsigned force_print)
{
gnutls_ocsp_resp_t resp;
int ret;
gnutls_datum_t buf, rbuf;
if (data->size == 0) {
fprintf(stderr, "Received empty response\n");
app_exit(1);
}
ret = gnutls_ocsp_resp_init(&resp);
if (ret < 0) {
fprintf(stderr, "ocsp_resp_init: %s\n",
gnutls_strerror(ret));
app_exit(1);
}
ret = gnutls_ocsp_resp_import2(resp, data, incert_format);
if (ret == GNUTLS_E_BASE64_UNEXPECTED_HEADER_ERROR) {
int ret2 = gnutls_ocsp_resp_import(resp, data);
if (ret2 >= 0)
ret = ret2;
}
if (ret < 0) {
fprintf(stderr, "error importing response: %s\n",
gnutls_strerror(ret));
app_exit(1);
}
if (ENABLED_OPT(VERBOSE))
ret =
gnutls_ocsp_resp_print(resp, GNUTLS_OCSP_PRINT_FULL,
&buf);
else
ret =
gnutls_ocsp_resp_print(resp, GNUTLS_OCSP_PRINT_COMPACT,
&buf);
if (ret != 0) {
fprintf(stderr, "ocsp_resp_print: %s\n",
gnutls_strerror(ret));
app_exit(1);
}
if (HAVE_OPT(OUTFILE)) {
ret = gnutls_ocsp_resp_export2(resp, &rbuf, outcert_format);
if (ret < 0) {
fprintf(stderr, "error exporting response: %s\n",
gnutls_strerror(ret));
app_exit(1);
}
if (outcert_format == GNUTLS_X509_FMT_PEM)
fprintf(outfile, "%.*s\n", buf.size, buf.data);
fwrite(rbuf.data, 1, rbuf.size, outfile);
if (outcert_format == GNUTLS_X509_FMT_PEM)
fprintf(outfile, "\n");
gnutls_free(rbuf.data);
}
if (force_print || !HAVE_OPT(OUTFILE)) {
ret = gnutls_ocsp_resp_export2(resp, &rbuf, GNUTLS_X509_FMT_PEM);
if (ret < 0) {
fprintf(stderr, "error exporting response: %s\n",
gnutls_strerror(ret));
app_exit(1);
}
fprintf(stdout, "%.*s\n", buf.size, buf.data);
fwrite(rbuf.data, 1, rbuf.size, stdout);
gnutls_free(rbuf.data);
}
gnutls_free(buf.data);
gnutls_ocsp_resp_deinit(resp);
}
static void response_info(void)
{
gnutls_datum_t dat;
size_t size;
if (HAVE_OPT(LOAD_RESPONSE))
dat.data =
(void *) read_file(OPT_ARG(LOAD_RESPONSE), RF_BINARY, &size);
else
dat.data = (void *) fread_file(infile, 0, &size);
if (dat.data == NULL) {
fprintf(stderr, "error reading response\n");
app_exit(1);
}
dat.size = size;
_response_info(&dat, 0);
gnutls_free(dat.data);
}
static void generate_request(gnutls_datum_t *nonce)
{
gnutls_datum_t dat;
gnutls_x509_crt_t cert, issuer;
common_info_st info;
memset(&info, 0, sizeof(info));
info.verbose = verbose;
if (!HAVE_OPT(LOAD_CERT)) {
fprintf(stderr, "Missing option --load-cert\n");
app_exit(1);
}
info.cert = OPT_ARG(LOAD_CERT);
cert = load_cert(1, &info);
memset(&info, 0, sizeof(info));
info.verbose = verbose;
if (!HAVE_OPT(LOAD_ISSUER)) {
fprintf(stderr, "Missing option --load-issuer\n");
app_exit(1);
}
info.cert = OPT_ARG(LOAD_ISSUER);
issuer = load_cert(1, &info);
_generate_request(cert, issuer, &dat, nonce);
gnutls_x509_crt_deinit(cert);
gnutls_x509_crt_deinit(issuer);
fwrite(dat.data, 1, dat.size, outfile);
gnutls_free(dat.data);
}
static int _verify_response(gnutls_datum_t * data, gnutls_datum_t * nonce,
gnutls_x509_crt_t signer, unsigned print_resp)
{
gnutls_ocsp_resp_t resp;
int ret;
size_t size;
gnutls_x509_crt_t *x509_ca_list = NULL;
gnutls_x509_trust_list_t list;
unsigned int x509_ncas = 0;
unsigned verify;
gnutls_datum_t dat;
ret = gnutls_ocsp_resp_init(&resp);
if (ret < 0) {
fprintf(stderr, "ocsp_resp_init: %s\n",
gnutls_strerror(ret));
app_exit(1);
}
ret = gnutls_ocsp_resp_import(resp, data);
if (ret < 0) {
fprintf(stderr, "importing response: %s\n",
gnutls_strerror(ret));
app_exit(1);
}
if (print_resp) {
ret =
gnutls_ocsp_resp_print(resp, GNUTLS_OCSP_PRINT_COMPACT,
&dat);
if (ret < 0) {
fprintf(stderr, "ocsp_resp_print: %s\n",
gnutls_strerror(ret));
app_exit(1);
}
printf("%s\n", dat.data);
gnutls_free(dat.data);
}
if (nonce) {
gnutls_datum_t rnonce;
ret = gnutls_ocsp_resp_get_nonce(resp, NULL, &rnonce);
if (ret < 0) {
fprintf(stderr, "could not read response's nonce: %s\n",
gnutls_strerror(ret));
app_exit(1);
}
if (rnonce.size != nonce->size || memcmp(nonce->data, rnonce.data,
nonce->size) != 0) {
fprintf(stderr, "nonce in the response doesn't match\n");
app_exit(1);
}
gnutls_free(rnonce.data);
}
if (HAVE_OPT(LOAD_TRUST)) {
dat.data =
(void *) read_file(OPT_ARG(LOAD_TRUST), RF_BINARY, &size);
if (dat.data == NULL) {
fprintf(stderr, "error reading --load-trust: %s\n",
OPT_ARG(LOAD_TRUST));
app_exit(1);
}
dat.size = size;
ret = gnutls_x509_trust_list_init(&list, 0);
if (ret < 0) {
fprintf(stderr, "gnutls_x509_trust_list_init: %s\n",
gnutls_strerror(ret));
app_exit(1);
}
ret =
gnutls_x509_crt_list_import2(&x509_ca_list, &x509_ncas,
&dat, GNUTLS_X509_FMT_PEM,
0);
if (ret < 0 || x509_ncas < 1) {
fprintf(stderr, "error parsing CAs: %s\n",
gnutls_strerror(ret));
app_exit(1);
}
if (HAVE_OPT(VERBOSE)) {
unsigned int i;
printf("Trust anchors:\n");
for (i = 0; i < x509_ncas; i++) {
gnutls_datum_t out;
ret =
gnutls_x509_crt_print(x509_ca_list[i],
GNUTLS_CRT_PRINT_ONELINE,
&out);
if (ret < 0) {
fprintf(stderr,
"gnutls_x509_crt_print: %s\n",
gnutls_strerror(ret));
app_exit(1);
}
printf("%d: %.*s\n", i, out.size,
out.data);
gnutls_free(out.data);
}
printf("\n");
}
ret =
gnutls_x509_trust_list_add_cas(list, x509_ca_list,
x509_ncas, 0);
if (ret < 0) {
fprintf(stderr, "gnutls_x509_trust_add_cas: %s\n",
gnutls_strerror(ret));
app_exit(1);
}
if (HAVE_OPT(VERBOSE))
fprintf(stdout, "Loaded %d trust anchors\n",
x509_ncas);
ret = gnutls_ocsp_resp_verify(resp, list, &verify, vflags);
if (ret < 0) {
fprintf(stderr, "gnutls_ocsp_resp_verify: %s\n",
gnutls_strerror(ret));
app_exit(1);
}
} else if (signer) {
if (HAVE_OPT(VERBOSE)) {
gnutls_datum_t out;
ret =
gnutls_x509_crt_print(signer,
GNUTLS_CRT_PRINT_ONELINE,
&out);
if (ret < 0) {
fprintf(stderr,
"gnutls_x509_crt_print: %s\n",
gnutls_strerror(ret));
app_exit(1);
}
printf("Signer: %.*s\n", out.size, out.data);
gnutls_free(out.data);
printf("\n");
}
ret =
gnutls_ocsp_resp_verify_direct(resp, signer, &verify,
vflags);
if (ret < 0) {
fprintf(stderr,
"\nVerifying OCSP Response: %s\n",
gnutls_strerror(ret));
app_exit(1);
}
} else {
fprintf(stderr, "missing --load-trust or --load-signer\n");
app_exit(1);
}
printf("\nVerifying OCSP Response: ");
print_ocsp_verify_res(verify);
printf(".\n");
gnutls_ocsp_resp_deinit(resp);
return verify;
}
#define MAX_CHAIN_SIZE 8
static
unsigned load_chain(gnutls_x509_crt_t chain[MAX_CHAIN_SIZE])
{
if (HAVE_OPT(LOAD_CHAIN)) {
common_info_st info;
size_t list_size;
memset(&info, 0, sizeof(info));
gnutls_x509_crt_t *list;
unsigned i;
info.verbose = verbose;
info.cert = OPT_ARG(LOAD_CHAIN);
info.sort_chain = 1;
list = load_cert_list(1, &list_size, &info);
if (list_size > MAX_CHAIN_SIZE) {
fprintf(stderr, "Too many certificates in chain\n");
app_exit(1);
}
for (i=0;i<list_size;i++)
chain[i] = list[i];
gnutls_free(list);
return list_size;
} else {
common_info_st info;
memset(&info, 0, sizeof(info));
info.verbose = verbose;
if (!HAVE_OPT(LOAD_CERT)) {
fprintf(stderr, "Missing option --load-cert\n");
app_exit(1);
}
info.cert = OPT_ARG(LOAD_CERT);
chain[0] = load_cert(1, &info);
memset(&info, 0, sizeof(info));
info.verbose = verbose;
if (!HAVE_OPT(LOAD_ISSUER)) {
fprintf(stderr, "Missing option --load-issuer\n");
app_exit(1);
}
info.cert = OPT_ARG(LOAD_ISSUER);
chain[1] = load_cert(1, &info);
return 2;
}
}
static void verify_response(gnutls_datum_t *nonce)
{
gnutls_datum_t dat;
size_t size;
gnutls_x509_crt_t signer;
common_info_st info;
int v;
gnutls_x509_crt_t chain[MAX_CHAIN_SIZE];
unsigned chain_size = 0, i;
if (HAVE_OPT(LOAD_RESPONSE))
dat.data =
(void *) read_file(OPT_ARG(LOAD_RESPONSE), RF_BINARY, &size);
else
dat.data = (void *) fread_file(infile, 0, &size);
if (dat.data == NULL) {
fprintf(stderr, "error reading response\n");
app_exit(1);
}
dat.size = size;
if (HAVE_OPT(LOAD_CHAIN)) {
chain_size = load_chain(chain);
if (chain_size < 1) {
fprintf(stderr, "Empty chain found; cannot verify\n");
app_exit(1);
}
if (chain_size == 1)
signer = chain[0];
else
signer = chain[1];
v = _verify_response(&dat, nonce, signer, 1);
for (i=0;i<chain_size;i++)
gnutls_x509_crt_deinit(chain[i]);
} else if (HAVE_OPT(LOAD_TRUST)) {
v = _verify_response(&dat, nonce, NULL, 1);
} else {
memset(&info, 0, sizeof(info));
info.verbose = verbose;
if (!HAVE_OPT(LOAD_SIGNER)) {
fprintf(stderr, "Missing option --load-signer or --load-chain\n");
app_exit(1);
}
info.cert = OPT_ARG(LOAD_SIGNER);
signer = load_cert(1, &info);
v = _verify_response(&dat, nonce, signer, 1);
gnutls_x509_crt_deinit(signer);
}
free(dat.data);
if (v && !HAVE_OPT(IGNORE_ERRORS))
app_exit(1);
}
static void ask_server(const char *url)
{
gnutls_datum_t resp_data;
int ret, v = 0, total_v = 0;
unsigned char noncebuf[23];
gnutls_datum_t nonce = { noncebuf, sizeof(noncebuf) };
gnutls_datum_t *n;
gnutls_x509_crt_t chain[MAX_CHAIN_SIZE];
unsigned chain_size, counter;
unsigned idx = 0;
common_info_st info;
chain_size = load_chain(chain);
if (chain_size > 2 && HAVE_OPT(OUTFILE)) {
if (outcert_format != GNUTLS_X509_FMT_PEM) {
fprintf(stderr, "error: You cannot combine --outfile when more than 2 certificates are found in a chain\n");
fprintf(stderr, "Did you mean to use --outpem?\n");
app_exit(1);
}
}
counter = chain_size;
while(counter > 1) {
if (ENABLED_OPT(NONCE)) {
ret =
gnutls_rnd(GNUTLS_RND_NONCE, nonce.data, nonce.size);
if (ret < 0) {
fprintf(stderr, "gnutls_rnd: %s\n",
gnutls_strerror(ret));
app_exit(1);
}
n = &nonce;
} else {
n = NULL;
}
ret =
send_ocsp_request(url, chain[idx], chain[idx+1], &resp_data, n);
if (ret < 0) {
fprintf(stderr, "Cannot send OCSP request\n");
app_exit(1);
}
_response_info(&resp_data, 1);
if (HAVE_OPT(LOAD_TRUST)) {
v = _verify_response(&resp_data, n, NULL, 0);
} else if (HAVE_OPT(LOAD_SIGNER)) {
memset(&info, 0, sizeof(info));
info.verbose = verbose;
info.cert = OPT_ARG(LOAD_SIGNER);
v = _verify_response(&resp_data, n, load_cert(1, &info), 0);
} else {
if (!HAVE_OPT(LOAD_CHAIN))
fprintf(stderr,
"\nAssuming response's signer = issuer (use --load-signer to override).\n");
v = _verify_response(&resp_data, n, chain[idx+1], 0);
}
total_v += v;
free(resp_data.data);
idx++;
counter--;
printf("\n");
}
for (idx = 0;idx<chain_size;idx++) {
gnutls_x509_crt_deinit(chain[idx]);
}
if (total_v && !HAVE_OPT(IGNORE_ERRORS))
app_exit(1);
}
int main(int argc, char **argv)
{
int ret;
if ((ret = gnutls_global_init()) < 0) {
fprintf(stderr, "global_init: %s\n", gnutls_strerror(ret));
app_exit(1);
}
optionProcess(&ocsptoolOptions, argc, argv);
gnutls_global_set_log_function(tls_log_func);
gnutls_global_set_log_level(OPT_VALUE_DEBUG);
if (ENABLED_OPT(INDER))
incert_format = GNUTLS_X509_FMT_DER;
else
incert_format = GNUTLS_X509_FMT_PEM;
if (HAVE_OPT(OUTPEM))
outcert_format = GNUTLS_X509_FMT_PEM;
else
outcert_format = GNUTLS_X509_FMT_DER;
if (HAVE_OPT(VERIFY_ALLOW_BROKEN))
vflags |= GNUTLS_VERIFY_ALLOW_BROKEN;
if (HAVE_OPT(OUTFILE)) {
outfile = fopen(OPT_ARG(OUTFILE), "wb");
if (outfile == NULL) {
fprintf(stderr, "%s\n", OPT_ARG(OUTFILE));
app_exit(1);
}
outfile_name = OPT_ARG(OUTFILE);
} else
outfile = stdout;
if (HAVE_OPT(INFILE)) {
infile = fopen(OPT_ARG(INFILE), "rb");
if (infile == NULL) {
fprintf(stderr, "%s\n", OPT_ARG(INFILE));
app_exit(1);
}
} else
infile = stdin;
if (ENABLED_OPT(INDER))
encoding = GNUTLS_X509_FMT_DER;
else
encoding = GNUTLS_X509_FMT_PEM;
if (HAVE_OPT(REQUEST_INFO))
request_info();
else if (HAVE_OPT(RESPONSE_INFO))
response_info();
else if (HAVE_OPT(GENERATE_REQUEST))
generate_request(NULL);
else if (HAVE_OPT(VERIFY_RESPONSE))
verify_response(NULL);
else if (HAVE_OPT(ASK)) {
if ((!HAVE_OPT(LOAD_CERT)) && (!HAVE_OPT(LOAD_CHAIN))) {
fprintf(stderr, "This option required --load-chain or --load-cert\n");
app_exit(1);
}
ask_server(OPT_ARG(ASK));
} else {
USAGE(1);
}
if (infile != stdin)
fclose(infile);
gnutls_global_deinit();
return 0;
}