curlx.c
/*
curlx.c Authors: Peter Sylvester, Jean-Paul Merlin
This is a little program to demonstrate the usage of
- an SSL initialization callback setting a user key and trustbases
coming from a pkcs12 file
- using an ssl application callback to find a URI in the
certificate presented during ssl session establishment.
*/
/* <DESC>
* demonstrates use of SSL context callback, requires OpenSSL
* </DESC>
*/
/*
* Copyright (c) 2003 - 2022 The OpenEvidence Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, the following disclaimer,
* and the original OpenSSL and SSLeay Licences below.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions, the following disclaimer
* and the original OpenSSL and SSLeay Licences below in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgments:
* "This product includes software developed by the Openevidence Project
* for use in the OpenEvidence Toolkit. (http://www.openevidence.org/)"
* This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (https://www.openssl.org/)"
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com)."
*
* 4. The names "OpenEvidence Toolkit" and "OpenEvidence Project" must not be
* used to endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* openevidence-core@openevidence.org.
*
* 5. Products derived from this software may not be called "OpenEvidence"
* nor may "OpenEvidence" appear in their names without prior written
* permission of the OpenEvidence Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgments:
* "This product includes software developed by the OpenEvidence Project
* for use in the OpenEvidence Toolkit (http://www.openevidence.org/)
* This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (https://www.openssl.org/)"
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com)."
*
* THIS SOFTWARE IS PROVIDED BY THE OpenEvidence PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenEvidence PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (https://www.openssl.org/)
* This product includes cryptographic software written by Eric Young
* (eay@cryptsoft.com). This product includes software written by Tim
* Hudson (tjh@cryptsoft.com).
*
* SPDX-License-Identifier: LicenseRef-OpenEvidence
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <curl/curl.h>
#include <openssl/x509v3.h>
#include <openssl/x509_vfy.h>
#include <openssl/crypto.h>
#include <openssl/lhash.h>
#include <openssl/objects.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/x509.h>
#include <openssl/pkcs12.h>
#include <openssl/bio.h>
#include <openssl/ssl.h>
static const char *curlx_usage[]={
"usage: curlx args\n",
" -p12 arg - tia file ",
" -envpass arg - environment variable which content the tia private"
" key password",
" -out arg - output file (response)- default stdout",
" -in arg - input file (request)- default stdin",
" -connect arg - URL of the server for the connection ex:"
" www.openevidence.org",
" -mimetype arg - MIME type for data in ex : application/timestamp-query"
" or application/dvcs -default application/timestamp-query",
" -acceptmime arg - MIME type acceptable for the response ex : "
"application/timestamp-response or application/dvcs -default none",
" -accesstype arg - an Object identifier in an AIA/SIA method, e.g."
" AD_DVCS or ad_timestamping",
NULL
};
/*
./curlx -p12 psy.p12 -envpass XX -in request -verbose -accesstype AD_DVCS
-mimetype application/dvcs -acceptmime application/dvcs -out response
*/
/*
* We use this ZERO_NULL to avoid picky compiler warnings,
* when assigning a NULL pointer to a function pointer var.
*/
#define ZERO_NULL 0
/* This is a context that we pass to all callbacks */
typedef struct sslctxparm_st {
unsigned char *p12file;
const char *pst;
PKCS12 *p12;
EVP_PKEY *pkey;
X509 *usercert;
STACK_OF(X509) * ca;
CURL *curl;
BIO *errorbio;
int accesstype;
int verbose;
} sslctxparm;
/* some helper function. */
static char *ia5string(ASN1_IA5STRING *ia5)
{
char *tmp;
if(!ia5 || !ia5->length)
return NULL;
tmp = OPENSSL_malloc(ia5->length + 1);
memcpy(tmp, ia5->data, ia5->length);
tmp[ia5->length] = 0;
return tmp;
}
/* A convenience routine to get an access URI. */
static unsigned char *my_get_ext(X509 *cert, const int type,
int extensiontype)
{
int i;
STACK_OF(ACCESS_DESCRIPTION) * accessinfo;
accessinfo = X509_get_ext_d2i(cert, extensiontype, NULL, NULL);
if(!sk_ACCESS_DESCRIPTION_num(accessinfo))
return NULL;
for(i = 0; i < sk_ACCESS_DESCRIPTION_num(accessinfo); i++) {
ACCESS_DESCRIPTION * ad = sk_ACCESS_DESCRIPTION_value(accessinfo, i);
if(OBJ_obj2nid(ad->method) == type) {
if(ad->location->type == GEN_URI) {
return ia5string(ad->location->d.ia5);
}
return NULL;
}
}
return NULL;
}
/* This is an application verification call back, it does not
perform any addition verification but tries to find a URL
in the presented certificate. If found, this will become
the URL to be used in the POST.
*/
static int ssl_app_verify_callback(X509_STORE_CTX *ctx, void *arg)
{
sslctxparm * p = (sslctxparm *) arg;
int ok;
#if OPENSSL_VERSION_NUMBER >= 0x1010000fL
X509 *cert = X509_STORE_CTX_get0_cert(ctx);
#else
X509 *cert = ctx->cert;
#endif
if(p->verbose > 2)
BIO_printf(p->errorbio, "entering ssl_app_verify_callback\n");
ok = X509_verify_cert(ctx);
if(ok && cert) {
unsigned char *accessinfo;
if(p->verbose > 1)
X509_print_ex(p->errorbio, cert, 0, 0);
accessinfo = my_get_ext(cert, p->accesstype, NID_sinfo_access);
if(accessinfo) {
if(p->verbose)
BIO_printf(p->errorbio, "Setting URL from SIA to: %s\n", accessinfo);
curl_easy_setopt(p->curl, CURLOPT_URL, accessinfo);
}
else if(accessinfo = my_get_ext(cert, p->accesstype,
NID_info_access)) {
if(p->verbose)
BIO_printf(p->errorbio, "Setting URL from AIA to: %s\n", accessinfo);
curl_easy_setopt(p->curl, CURLOPT_URL, accessinfo);
}
}
if(p->verbose > 2)
BIO_printf(p->errorbio, "leaving ssl_app_verify_callback with %d\n", ok);
return ok;
}
/* The SSL initialization callback. The callback sets:
- a private key and certificate
- a trusted ca certificate
- a preferred cipherlist
- an application verification callback (the function above)
*/
static CURLcode sslctxfun(CURL *curl, void *sslctx, void *parm)
{
sslctxparm *p = (sslctxparm *) parm;
SSL_CTX *ctx = (SSL_CTX *) sslctx;
if(!SSL_CTX_use_certificate(ctx, p->usercert)) {
BIO_printf(p->errorbio, "SSL_CTX_use_certificate problem\n");
goto err;
}
if(!SSL_CTX_use_PrivateKey(ctx, p->pkey)) {
BIO_printf(p->errorbio, "SSL_CTX_use_PrivateKey\n");
goto err;
}
if(!SSL_CTX_check_private_key(ctx)) {
BIO_printf(p->errorbio, "SSL_CTX_check_private_key\n");
goto err;
}
SSL_CTX_set_quiet_shutdown(ctx, 1);
SSL_CTX_set_cipher_list(ctx, "RC4-MD5");
SSL_CTX_set_mode(ctx, SSL_MODE_AUTO_RETRY);
X509_STORE_add_cert(SSL_CTX_get_cert_store(ctx),
sk_X509_value(p->ca, sk_X509_num(p->ca)-1));
SSL_CTX_set_verify_depth(ctx, 2);
SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, ZERO_NULL);
SSL_CTX_set_cert_verify_callback(ctx, ssl_app_verify_callback, parm);
return CURLE_OK;
err:
ERR_print_errors(p->errorbio);
return CURLE_SSL_CERTPROBLEM;
}
int main(int argc, char **argv)
{
BIO* in = NULL;
BIO* out = NULL;
char *outfile = NULL;
char *infile = NULL;
int tabLength = 100;
char *binaryptr;
char *mimetype = NULL;
char *mimetypeaccept = NULL;
char *contenttype;
const char **pp;
unsigned char *hostporturl = NULL;
BIO *p12bio;
char **args = argv + 1;
unsigned char *serverurl;
sslctxparm p;
char *response;
CURLcode res;
struct curl_slist *headers = NULL;
int badarg = 0;
binaryptr = malloc(tabLength);
memset(&p, '\0', sizeof(p));
p.errorbio = BIO_new_fp(stderr, BIO_NOCLOSE);
curl_global_init(CURL_GLOBAL_DEFAULT);
/* we need some more for the P12 decoding */
OpenSSL_add_all_ciphers();
OpenSSL_add_all_digests();
ERR_load_crypto_strings();
while(*args && *args[0] == '-') {
if(!strcmp (*args, "-in")) {
if(args[1]) {
infile = *(++args);
}
else
badarg = 1;
}
else if(!strcmp (*args, "-out")) {
if(args[1]) {
outfile = *(++args);
}
else
badarg = 1;
}
else if(!strcmp (*args, "-p12")) {
if(args[1]) {
p.p12file = *(++args);
}
else
badarg = 1;
}
else if(strcmp(*args, "-envpass") == 0) {
if(args[1]) {
p.pst = getenv(*(++args));
}
else
badarg = 1;
}
else if(strcmp(*args, "-connect") == 0) {
if(args[1]) {
hostporturl = *(++args);
}
else
badarg = 1;
}
else if(strcmp(*args, "-mimetype") == 0) {
if(args[1]) {
mimetype = *(++args);
}
else
badarg = 1;
}
else if(strcmp(*args, "-acceptmime") == 0) {
if(args[1]) {
mimetypeaccept = *(++args);
}
else
badarg = 1;
}
else if(strcmp(*args, "-accesstype") == 0) {
if(args[1]) {
p.accesstype = OBJ_obj2nid(OBJ_txt2obj(*++args, 0));
if(p.accesstype == 0)
badarg = 1;
}
else
badarg = 1;
}
else if(strcmp(*args, "-verbose") == 0) {
p.verbose++;
}
else
badarg = 1;
args++;
}
if(!mimetype || !mimetypeaccept || !p.p12file)
badarg = 1;
if(badarg) {
for(pp = curlx_usage; (*pp != NULL); pp++)
BIO_printf(p.errorbio, "%s\n", *pp);
BIO_printf(p.errorbio, "\n");
goto err;
}
/* set input */
in = BIO_new(BIO_s_file());
if(!in) {
BIO_printf(p.errorbio, "Error setting input bio\n");
goto err;
}
else if(!infile)
BIO_set_fp(in, stdin, BIO_NOCLOSE|BIO_FP_TEXT);
else if(BIO_read_filename(in, infile) <= 0) {
BIO_printf(p.errorbio, "Error opening input file %s\n", infile);
BIO_free(in);
goto err;
}
/* set output */
out = BIO_new(BIO_s_file());
if(!out) {
BIO_printf(p.errorbio, "Error setting output bio.\n");
goto err;
}
else if(!outfile)
BIO_set_fp(out, stdout, BIO_NOCLOSE|BIO_FP_TEXT);
else if(BIO_write_filename(out, outfile) <= 0) {
BIO_printf(p.errorbio, "Error opening output file %s\n", outfile);
BIO_free(out);
goto err;
}
p.errorbio = BIO_new_fp(stderr, BIO_NOCLOSE);
p.curl = curl_easy_init();
if(!p.curl) {
BIO_printf(p.errorbio, "Cannot init curl lib\n");
goto err;
}
p12bio = BIO_new_file(p.p12file, "rb");
if(!p12bio) {
BIO_printf(p.errorbio, "Error opening P12 file %s\n", p.p12file);
goto err;
}
p.p12 = d2i_PKCS12_bio(p12bio, NULL);
if(!p.p12) {
BIO_printf(p.errorbio, "Cannot decode P12 structure %s\n", p.p12file);
goto err;
}
p.ca = NULL;
if(!(PKCS12_parse (p.p12, p.pst, &(p.pkey), &(p.usercert), &(p.ca) ) )) {
BIO_printf(p.errorbio, "Invalid P12 structure in %s\n", p.p12file);
goto err;
}
if(sk_X509_num(p.ca) <= 0) {
BIO_printf(p.errorbio, "No trustworthy CA given.%s\n", p.p12file);
goto err;
}
if(p.verbose > 1)
X509_print_ex(p.errorbio, p.usercert, 0, 0);
/* determine URL to go */
if(hostporturl) {
size_t len = strlen(hostporturl) + 9;
serverurl = malloc(len);
snprintf(serverurl, len, "https://%s", hostporturl);
}
else if(p.accesstype) { /* see whether we can find an AIA or SIA for a
given access type */
serverurl = my_get_ext(p.usercert, p.accesstype, NID_info_access);
if(!serverurl) {
int j = 0;
BIO_printf(p.errorbio, "no service URL in user cert "
"searching in others certificates\n");
for(j = 0; j<sk_X509_num(p.ca); j++) {
serverurl = my_get_ext(sk_X509_value(p.ca, j), p.accesstype,
NID_info_access);
if(serverurl)
break;
serverurl = my_get_ext(sk_X509_value(p.ca, j), p.accesstype,
NID_sinfo_access);
if(serverurl)
break;
}
}
}
if(!serverurl) {
BIO_printf(p.errorbio, "no service URL in certificates,"
" check '-accesstype (AD_DVCS | ad_timestamping)'"
" or use '-connect'\n");
goto err;
}
if(p.verbose)
BIO_printf(p.errorbio, "Service URL: <%s>\n", serverurl);
curl_easy_setopt(p.curl, CURLOPT_URL, serverurl);
/* Now specify the POST binary data */
curl_easy_setopt(p.curl, CURLOPT_POSTFIELDS, binaryptr);
curl_easy_setopt(p.curl, CURLOPT_POSTFIELDSIZE, (long)tabLength);
/* pass our list of custom made headers */
contenttype = malloc(15 + strlen(mimetype));
snprintf(contenttype, 15 + strlen(mimetype), "Content-type: %s", mimetype);
headers = curl_slist_append(headers, contenttype);
curl_easy_setopt(p.curl, CURLOPT_HTTPHEADER, headers);
if(p.verbose)
BIO_printf(p.errorbio, "Service URL: <%s>\n", serverurl);
{
FILE *outfp;
BIO_get_fp(out, &outfp);
curl_easy_setopt(p.curl, CURLOPT_WRITEDATA, outfp);
}
res = curl_easy_setopt(p.curl, CURLOPT_SSL_CTX_FUNCTION, sslctxfun);
if(res != CURLE_OK)
BIO_printf(p.errorbio, "%d %s=%d %d\n", 520,
"CURLOPT_SSL_CTX_FUNCTION", CURLOPT_SSL_CTX_FUNCTION, res);
curl_easy_setopt(p.curl, CURLOPT_SSL_CTX_DATA, &p);
{
char *ptr;
int lu; int i = 0;
while((lu = BIO_read(in, &binaryptr[i], tabLength-i)) >0) {
i += lu;
if(i == tabLength) {
tabLength += 100;
ptr = realloc(binaryptr, tabLength); /* should be more careful */
if(!ptr) {
/* out of memory */
BIO_printf(p.errorbio, "out of memory (realloc returned NULL)\n");
goto fail;
}
binaryptr = ptr;
ptr = NULL;
}
}
tabLength = i;
}
/* Now specify the POST binary data */
curl_easy_setopt(p.curl, CURLOPT_POSTFIELDS, binaryptr);
curl_easy_setopt(p.curl, CURLOPT_POSTFIELDSIZE, (long)tabLength);
/* Perform the request, res will get the return code */
BIO_printf(p.errorbio, "%d %s %d\n", 552, "curl_easy_perform",
res = curl_easy_perform(p.curl));
{
curl_easy_getinfo(p.curl, CURLINFO_CONTENT_TYPE, &response);
if(mimetypeaccept && p.verbose) {
if(!strcmp(mimetypeaccept, response))
BIO_printf(p.errorbio, "the response has a correct mimetype : %s\n",
response);
else
BIO_printf(p.errorbio, "the response doesn\'t have an acceptable "
"mime type, it is %s instead of %s\n",
response, mimetypeaccept);
}
}
/*** code d'erreur si accept mime ***, egalement code return HTTP != 200 ***/
/* free the header list*/
fail:
curl_slist_free_all(headers);
/* always cleanup */
curl_easy_cleanup(p.curl);
BIO_free(in);
BIO_free(out);
return (EXIT_SUCCESS);
err: BIO_printf(p.errorbio, "error");
exit(1);
}