curlx.c

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/* 
  curlx.c  Authors: Peter Sylvester, Jean-Paul Merlin

  This is a little program to demonstrate the usage of

  - an ssl initialisation 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. 

*/


/*
 * Copyright (c) 2003 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 (http://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 (http://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 (http://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).
 *
 */

#include <stdio.h>
#include <stdlib.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 char *curlx_usage[]={
"usage: curlx args\n",
" -p12 arg         - tia  file ",
" -envpass arg     - environement 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.openevidenve.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

*/

/* 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 *i2s_ASN1_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 conveniance 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 i2s_ASN1_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 certificat. 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 (p->verbose > 2) BIO_printf(p->errorbio,"entering ssl_app_verify_callback\n"); 
        if ((ok= X509_verify_cert(ctx)) && ctx->cert) {
                unsigned char * accessinfo ;
                if (p->verbose > 1) X509_print_ex(p->errorbio,ctx->cert,0,0); 
                if (accessinfo = my_get_ext(ctx->cert,p->accesstype ,NID_sinfo_access)) {
                        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(ctx->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);
}


/* This is an example of an curl SSL initialisation call back. 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(ctx->cert_store,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,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;
        char* mimetypeaccept=NULL;
        char* contenttype;
        char** pp;
        unsigned char* hostporturl = NULL;
        binaryptr=(char*)malloc(tabLength);
        BIO * p12bio ;
        char **args = argv + 1;
        unsigned char * serverurl;
        sslctxparm p;
        char *response;
        p.verbose = 0;

        CURLcode res;
        struct curl_slist * headers=NULL;

        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();


        int badarg=0;

        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]) {
                                if ((p.accesstype = OBJ_obj2nid(OBJ_txt2obj(*++args,0))) == 0) badarg=1;
                        } else badarg=1; 
                } else if (strcmp(*args,"-verbose") == 0) {
                        p.verbose++;
                } else badarg=1;
                args++;
        }
   
        if (mimetype==NULL || mimetypeaccept == NULL) 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 */
   
        if ((in=BIO_new(BIO_s_file())) == NULL) {
                BIO_printf(p.errorbio, "Error setting input bio\n");
                goto err;
        } else if (infile == NULL)
                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  */
     
        if ((out=BIO_new(BIO_s_file())) == NULL) {
                BIO_printf(p.errorbio, "Error setting output bio.\n");
                goto err;
        } else if (outfile == NULL)
                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);
  
        if (!(p.curl = curl_easy_init())) {
                BIO_printf(p.errorbio, "Cannot init curl lib\n");
                goto err;
        } 



        if (!(p12bio = BIO_new_file(p.p12file , "rb"))) {
                BIO_printf(p.errorbio, "Error opening P12 file %s\n", p.p12file); goto err;
        }
        if (!(p.p12 = d2i_PKCS12_bio (p12bio, NULL))) {
                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) {
                serverurl=(char*) malloc(9+strlen(hostporturl));
                sprintf(serverurl,"https://%s",hostporturl);
        } else if (p.accesstype != 0) { /* see whether we can find an AIA or SIA for a given access type */
                if (!(serverurl = my_get_ext(p.usercert,p.accesstype,NID_info_access))) {
                        BIO_printf(p.errorbio,"no service URL in user cert cherching in others certificats\n"); 
                        int j=0;
                        int find=0;
                        for (j=0;j<sk_X509_num(p.ca);j++) {
                                if ((serverurl = my_get_ext(sk_X509_value(p.ca,j),p.accesstype,NID_info_access))) break; 
                                if ((serverurl = my_get_ext(sk_X509_value(p.ca,j),p.accesstype,NID_sinfo_access))) break; 
                        }
                }
        }

        if (!serverurl) { 
               BIO_printf(p.errorbio, "no service URL in certificats, 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,tabLength);
  
        /* pass our list of custom made headers */

        contenttype=(char*) malloc(15+strlen(mimetype));
        sprintf(contenttype,"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_FILE,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", __LINE__, "CURLOPT_SSL_CTX_FUNCTION",CURLOPT_SSL_CTX_FUNCTION,res);
   
        curl_easy_setopt(p.curl, CURLOPT_SSL_CTX_DATA, &p);  

        {
                int lu; int i=0;
                while ((lu = BIO_read (in,&binaryptr[i],tabLength-i)) >0 ) {
                        i+=lu;
                        if (i== tabLength) {
                                tabLength+=100;
                                binaryptr=(char*)realloc(binaryptr,tabLength); /* should be more careful */
                        }
                }
                tabLength = i;
        }
        /* Now specify the POST binary data */

        curl_easy_setopt(p.curl, CURLOPT_POSTFIELDS, binaryptr);
        curl_easy_setopt(p.curl, CURLOPT_POSTFIELDSIZE,tabLength);

 
    /* Perform the request, res will get the return code */

        BIO_printf(p.errorbio,"%d %s %d\n", __LINE__, "curl_easy_perform", res = curl_easy_perform(p.curl));
        {
                int result =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 reponse doesn\'t has 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*/

    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);
}