curl/docs/examples/curlx.c

   1 /*
   2   curlx.c  Authors: Peter Sylvester, Jean-Paul Merlin
   3
   4   This is a little program to demonstrate the usage of
   5
   6   - an ssl initialisation callback setting a user key and trustbases
   7   coming from a pkcs12 file
   8   - using an ssl application callback to find a URI in the
   9   certificate presented during ssl session establishment.
  10
  11 */
  12
  13
  14 /*
  15  * Copyright (c) 2003 The OpenEvidence Project.  All rights reserved.
  16  *
  17  * Redistribution and use in source and binary forms, with or without
  18  * modification, are permitted provided that the following conditions
  19  * are met:
  20  *
  21  * 1. Redistributions of source code must retain the above copyright
  22  *    notice, this list of conditions, the following disclaimer,
  23  *    and the original OpenSSL and SSLeay Licences below.
  24  *
  25  * 2. Redistributions in binary form must reproduce the above copyright
  26  *    notice, this list of conditions, the following disclaimer
  27  *    and the original OpenSSL and SSLeay Licences below in
  28  *    the documentation and/or other materials provided with the
  29  *    distribution.
  30  *
  31  * 3. All advertising materials mentioning features or use of this
  32  *    software must display the following acknowledgments:
  33  *    "This product includes software developed by the Openevidence Project
  34  *    for use in the OpenEvidence Toolkit. (http://www.openevidence.org/)"
  35  *    This product includes software developed by the OpenSSL Project
  36  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  37  *    This product includes cryptographic software written by Eric Young
  38  *    (eay@cryptsoft.com).  This product includes software written by Tim
  39  *    Hudson (tjh@cryptsoft.com)."
  40  *
  41  * 4. The names "OpenEvidence Toolkit" and "OpenEvidence Project" must not be
  42  *    used to endorse or promote products derived from this software without
  43  *    prior written permission. For written permission, please contact
  44  *    openevidence-core@openevidence.org.
  45  *
  46  * 5. Products derived from this software may not be called "OpenEvidence"
  47  *    nor may "OpenEvidence" appear in their names without prior written
  48  *    permission of the OpenEvidence Project.
  49  *
  50  * 6. Redistributions of any form whatsoever must retain the following
  51  *    acknowledgments:
  52  *    "This product includes software developed by the OpenEvidence Project
  53  *    for use in the OpenEvidence Toolkit (http://www.openevidence.org/)
  54  *    This product includes software developed by the OpenSSL Project
  55  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  56  *    This product includes cryptographic software written by Eric Young
  57  *    (eay@cryptsoft.com).  This product includes software written by Tim
  58  *    Hudson (tjh@cryptsoft.com)."
  59  *
  60  * THIS SOFTWARE IS PROVIDED BY THE OpenEvidence PROJECT ``AS IS'' AND ANY
  61  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  62  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  63  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenEvidence PROJECT OR
  64  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  65  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  66  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  67  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  68  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  69  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  70  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  71  * OF THE POSSIBILITY OF SUCH DAMAGE.
  72  * ====================================================================
  73  *
  74  * This product includes software developed by the OpenSSL Project
  75  * for use in the OpenSSL Toolkit (http://www.openssl.org/)
  76  * This product includes cryptographic software written by Eric Young
  77  * (eay@cryptsoft.com).  This product includes software written by Tim
  78  * Hudson (tjh@cryptsoft.com).
  79  *
  80  */
  81
  82 #include <stdio.h>
  83 #include <stdlib.h>
  84 #include <string.h>
  85 #include <curl/curl.h>
  86 #include <openssl/x509v3.h>
  87 #include <openssl/x509_vfy.h>
  88 #include <openssl/crypto.h>
  89 #include <openssl/lhash.h>
  90 #include <openssl/objects.h>
  91 #include <openssl/err.h>
  92 #include <openssl/evp.h>
  93 #include <openssl/x509.h>
  94 #include <openssl/pkcs12.h>
  95 #include <openssl/bio.h>
  96 #include <openssl/ssl.h>
  97
  98 static const char *curlx_usage[]={
  99   "usage: curlx args\n",
 100   " -p12 arg         - tia  file ",
 101   " -envpass arg     - environement variable which content the tia private key password",
 102   " -out arg         - output file (response)- default stdout",
 103   " -in arg          - input file (request)- default stdin",
 104   " -connect arg     - URL of the server for the connection ex: www.openevidence.org",
 105   " -mimetype arg    - MIME type for data in ex : application/timestamp-query or application/dvcs -default application/timestamp-query",
 106   " -acceptmime arg  - MIME type acceptable for the response ex : application/timestamp-response or application/dvcs -default none",
 107   " -accesstype arg  - an Object identifier in an AIA/SIA method, e.g. AD_DVCS or ad_timestamping",
 108   NULL
 109 };
 110
 111 /*
 112
 113 ./curlx -p12 psy.p12 -envpass XX -in request -verbose -accesstype AD_DVCS
 114 -mimetype application/dvcs -acceptmime application/dvcs -out response
 115
 116 */
 117
 118 /*
 119  * We use this ZERO_NULL to avoid picky compiler warnings,
 120  * when assigning a NULL pointer to a function pointer var.
 121  */
 122
 123 #define ZERO_NULL 0
 124
 125 /* This is a context that we pass to all callbacks */
 126
 127 typedef struct sslctxparm_st {
 128   unsigned char * p12file ;
 129   const char * pst ;
 130   PKCS12 * p12 ;
 131   EVP_PKEY * pkey ;
 132   X509 * usercert ;
 133   STACK_OF(X509) * ca ;
 134   CURL * curl;
 135   BIO * errorbio;
 136   int accesstype ;
 137   int verbose;
 138
 139 } sslctxparm;
 140
 141 /* some helper function. */
 142
 143 static char *i2s_ASN1_IA5STRING( ASN1_IA5STRING *ia5)
 144 {
 145   char *tmp;
 146   if(!ia5 || !ia5->length)
 147     return NULL;
 148   tmp = OPENSSL_malloc(ia5->length + 1);
 149   memcpy(tmp, ia5->data, ia5->length);
 150   tmp[ia5->length] = 0;
 151   return tmp;
 152 }
 153
 154 /* A conveniance routine to get an access URI. */
 155
 156 static unsigned char *my_get_ext(X509 * cert, const int type, int extensiontype) {
 157
 158   int i;
 159   STACK_OF(ACCESS_DESCRIPTION) * accessinfo ;
 160   accessinfo =  X509_get_ext_d2i(cert, extensiontype, NULL, NULL) ;
 161
 162   if (!sk_ACCESS_DESCRIPTION_num(accessinfo))
 163     return NULL;
 164   for (i = 0; i < sk_ACCESS_DESCRIPTION_num(accessinfo); i++) {
 165     ACCESS_DESCRIPTION * ad = sk_ACCESS_DESCRIPTION_value(accessinfo, i);
 166     if (OBJ_obj2nid(ad->method) == type) {
 167       if (ad->location->type == GEN_URI) {
 168         return i2s_ASN1_IA5STRING(ad->location->d.ia5);
 169       }
 170       return NULL;
 171     }
 172   }
 173   return NULL;
 174 }
 175
 176 /* This is an application verification call back, it does not
 177    perform any addition verification but tries to find a URL
 178    in the presented certificat. If found, this will become
 179    the URL to be used in the POST.
 180 */
 181
 182 static int ssl_app_verify_callback(X509_STORE_CTX *ctx, void *arg)
 183 {
 184   sslctxparm * p = (sslctxparm *) arg;
 185   int ok;
 186
 187   if (p->verbose > 2)
 188     BIO_printf(p->errorbio,"entering ssl_app_verify_callback\n");
 189
 190   if ((ok= X509_verify_cert(ctx)) && ctx->cert) {
 191     unsigned char * accessinfo ;
 192     if (p->verbose > 1)
 193       X509_print_ex(p->errorbio,ctx->cert,0,0);
 194
 195     if (accessinfo = my_get_ext(ctx->cert,p->accesstype ,NID_sinfo_access)) {
 196       if (p->verbose)
 197         BIO_printf(p->errorbio,"Setting URL from SIA to: %s\n", accessinfo);
 198
 199       curl_easy_setopt(p->curl, CURLOPT_URL,accessinfo);
 200     }
 201     else if (accessinfo = my_get_ext(ctx->cert,p->accesstype,
 202                                      NID_info_access)) {
 203       if (p->verbose)
 204         BIO_printf(p->errorbio,"Setting URL from AIA to: %s\n", accessinfo);
 205
 206       curl_easy_setopt(p->curl, CURLOPT_URL,accessinfo);
 207     }
 208   }
 209   if (p->verbose > 2)
 210     BIO_printf(p->errorbio,"leaving ssl_app_verify_callback with %d\n", ok);
 211   return(ok);
 212 }
 213
 214
 215 /* This is an example of an curl SSL initialisation call back. The callback sets:
 216    - a private key and certificate
 217    - a trusted ca certificate
 218    - a preferred cipherlist
 219    - an application verification callback (the function above)
 220 */
 221
 222 static CURLcode sslctxfun(CURL * curl, void * sslctx, void * parm) {
 223
 224   sslctxparm * p = (sslctxparm *) parm;
 225   SSL_CTX * ctx = (SSL_CTX *) sslctx ;
 226
 227   if (!SSL_CTX_use_certificate(ctx,p->usercert)) {
 228     BIO_printf(p->errorbio, "SSL_CTX_use_certificate problem\n"); goto err;
 229   }
 230   if (!SSL_CTX_use_PrivateKey(ctx,p->pkey)) {
 231     BIO_printf(p->errorbio, "SSL_CTX_use_PrivateKey\n"); goto err;
 232   }
 233
 234   if (!SSL_CTX_check_private_key(ctx)) {
 235     BIO_printf(p->errorbio, "SSL_CTX_check_private_key\n"); goto err;
 236   }
 237
 238   SSL_CTX_set_quiet_shutdown(ctx,1);
 239   SSL_CTX_set_cipher_list(ctx,"RC4-MD5");
 240   SSL_CTX_set_mode(ctx, SSL_MODE_AUTO_RETRY);
 241
 242   X509_STORE_add_cert(ctx->cert_store,sk_X509_value(p->ca,
 243                                                     sk_X509_num(p->ca)-1));
 244
 245   SSL_CTX_set_verify_depth(ctx,2);
 246
 247   SSL_CTX_set_verify(ctx,SSL_VERIFY_PEER,ZERO_NULL);
 248
 249   SSL_CTX_set_cert_verify_callback(ctx, ssl_app_verify_callback, parm);
 250
 251
 252   return CURLE_OK ;
 253   err:
 254   ERR_print_errors(p->errorbio);
 255   return CURLE_SSL_CERTPROBLEM;
 256
 257 }
 258
 259 int main(int argc, char **argv) {
 260
 261   BIO* in=NULL;
 262   BIO* out=NULL;
 263
 264   char * outfile = NULL;
 265   char * infile = NULL ;
 266
 267   int tabLength=100;
 268   char *binaryptr;
 269   char* mimetype;
 270   char* mimetypeaccept=NULL;
 271   char* contenttype;
 272   const char** pp;
 273   unsigned char* hostporturl = NULL;
 274   BIO * p12bio ;
 275   char **args = argv + 1;
 276   unsigned char * serverurl;
 277   sslctxparm p;
 278   char *response;
 279
 280   CURLcode res;
 281   struct curl_slist * headers=NULL;
 282   int badarg=0;
 283
 284   binaryptr=(char*)malloc(tabLength);
 285
 286   p.verbose = 0;
 287   p.errorbio = BIO_new_fp (stderr, BIO_NOCLOSE);
 288
 289   curl_global_init(CURL_GLOBAL_DEFAULT);
 290
 291   /* we need some more for the P12 decoding */
 292
 293   OpenSSL_add_all_ciphers();
 294   OpenSSL_add_all_digests();
 295   ERR_load_crypto_strings();
 296
 297
 298
 299   while (*args && *args[0] == '-') {
 300     if (!strcmp (*args, "-in")) {
 301       if (args[1]) {
 302         infile=*(++args);
 303       } else badarg=1;
 304     } else if (!strcmp (*args, "-out")) {
 305       if (args[1]) {
 306         outfile=*(++args);
 307       } else badarg=1;
 308     } else if (!strcmp (*args, "-p12")) {
 309       if (args[1]) {
 310         p.p12file = *(++args);
 311       } else badarg=1;
 312     } else if (strcmp(*args,"-envpass") == 0) {
 313       if (args[1]) {
 314         p.pst = getenv(*(++args));
 315       } else badarg=1;
 316     } else if (strcmp(*args,"-connect") == 0) {
 317       if (args[1]) {
 318         hostporturl = *(++args);
 319       } else badarg=1;
 320     } else if (strcmp(*args,"-mimetype") == 0) {
 321       if (args[1]) {
 322         mimetype = *(++args);
 323       } else badarg=1;
 324     } else if (strcmp(*args,"-acceptmime") == 0) {
 325       if (args[1]) {
 326         mimetypeaccept = *(++args);
 327       } else badarg=1;
 328     } else if (strcmp(*args,"-accesstype") == 0) {
 329       if (args[1]) {
 330         if ((p.accesstype = OBJ_obj2nid(OBJ_txt2obj(*++args,0))) == 0) badarg=1;
 331       } else badarg=1;
 332     } else if (strcmp(*args,"-verbose") == 0) {
 333       p.verbose++;
 334     } else badarg=1;
 335     args++;
 336   }
 337
 338   if (mimetype==NULL || mimetypeaccept == NULL) badarg = 1;
 339
 340   if (badarg) {
 341     for (pp=curlx_usage; (*pp != NULL); pp++)
 342       BIO_printf(p.errorbio,"%s\n",*pp);
 343     BIO_printf(p.errorbio,"\n");
 344     goto err;
 345   }
 346
 347
 348
 349   /* set input */
 350
 351   if ((in=BIO_new(BIO_s_file())) == NULL) {
 352     BIO_printf(p.errorbio, "Error setting input bio\n");
 353     goto err;
 354   } else if (infile == NULL)
 355     BIO_set_fp(in,stdin,BIO_NOCLOSE|BIO_FP_TEXT);
 356   else if (BIO_read_filename(in,infile) <= 0) {
 357     BIO_printf(p.errorbio, "Error opening input file %s\n", infile);
 358     BIO_free(in);
 359     goto err;
 360   }
 361
 362   /* set output  */
 363
 364   if ((out=BIO_new(BIO_s_file())) == NULL) {
 365     BIO_printf(p.errorbio, "Error setting output bio.\n");
 366     goto err;
 367   } else if (outfile == NULL)
 368     BIO_set_fp(out,stdout,BIO_NOCLOSE|BIO_FP_TEXT);
 369   else if (BIO_write_filename(out,outfile) <= 0) {
 370     BIO_printf(p.errorbio, "Error opening output file %s\n", outfile);
 371     BIO_free(out);
 372     goto err;
 373   }
 374
 375
 376   p.errorbio = BIO_new_fp (stderr, BIO_NOCLOSE);
 377
 378   if (!(p.curl = curl_easy_init())) {
 379     BIO_printf(p.errorbio, "Cannot init curl lib\n");
 380     goto err;
 381   }
 382
 383
 384
 385   if (!(p12bio = BIO_new_file(p.p12file , "rb"))) {
 386     BIO_printf(p.errorbio, "Error opening P12 file %s\n", p.p12file); goto err;
 387   }
 388   if (!(p.p12 = d2i_PKCS12_bio (p12bio, NULL))) {
 389     BIO_printf(p.errorbio, "Cannot decode P12 structure %s\n", p.p12file); goto err;
 390   }
 391
 392   p.ca= NULL;
 393   if (!(PKCS12_parse (p.p12, p.pst, &(p.pkey), &(p.usercert), &(p.ca) ) )) {
 394     BIO_printf(p.errorbio,"Invalid P12 structure in %s\n", p.p12file); goto err;
 395   }
 396
 397   if (sk_X509_num(p.ca) <= 0) {
 398     BIO_printf(p.errorbio,"No trustworthy CA given.%s\n", p.p12file); goto err;
 399   }
 400
 401   if (p.verbose > 1)
 402     X509_print_ex(p.errorbio,p.usercert,0,0);
 403
 404   /* determine URL to go */
 405
 406   if (hostporturl) {
 407     serverurl=(char*) malloc(9+strlen(hostporturl));
 408     sprintf(serverurl,"https://%s",hostporturl);
 409   }
 410   else if (p.accesstype != 0) { /* see whether we can find an AIA or SIA for a given access type */
 411     if (!(serverurl = my_get_ext(p.usercert,p.accesstype,NID_info_access))) {
 412       int j=0;
 413       BIO_printf(p.errorbio,"no service URL in user cert "
 414                  "cherching in others certificats\n");
 415       for (j=0;j<sk_X509_num(p.ca);j++) {
 416         if ((serverurl = my_get_ext(sk_X509_value(p.ca,j),p.accesstype,
 417                                     NID_info_access)))
 418           break;
 419         if ((serverurl = my_get_ext(sk_X509_value(p.ca,j),p.accesstype,
 420                                     NID_sinfo_access)))
 421           break;
 422       }
 423     }
 424   }
 425
 426   if (!serverurl) {
 427     BIO_printf(p.errorbio, "no service URL in certificats,"
 428                " check '-accesstype (AD_DVCS | ad_timestamping)'"
 429                " or use '-connect'\n");
 430     goto err;
 431   }
 432
 433   if (p.verbose)
 434     BIO_printf(p.errorbio, "Service URL: <%s>\n", serverurl);
 435
 436   curl_easy_setopt(p.curl, CURLOPT_URL, serverurl);
 437
 438   /* Now specify the POST binary data */
 439
 440   curl_easy_setopt(p.curl, CURLOPT_POSTFIELDS, binaryptr);
 441   curl_easy_setopt(p.curl, CURLOPT_POSTFIELDSIZE,(long)tabLength);
 442
 443   /* pass our list of custom made headers */
 444
 445   contenttype=(char*) malloc(15+strlen(mimetype));
 446   sprintf(contenttype,"Content-type: %s",mimetype);
 447   headers = curl_slist_append(headers,contenttype);
 448   curl_easy_setopt(p.curl, CURLOPT_HTTPHEADER, headers);
 449
 450   if (p.verbose)
 451     BIO_printf(p.errorbio, "Service URL: <%s>\n", serverurl);
 452
 453   {
 454     FILE *outfp;
 455     BIO_get_fp(out,&outfp);
 456     curl_easy_setopt(p.curl, CURLOPT_FILE,outfp);
 457   }
 458
 459   res = curl_easy_setopt(p.curl, CURLOPT_SSL_CTX_FUNCTION, sslctxfun)  ;
 460
 461   if (res != CURLE_OK)
 462     BIO_printf(p.errorbio,"%d %s=%d %d\n", __LINE__, "CURLOPT_SSL_CTX_FUNCTION",CURLOPT_SSL_CTX_FUNCTION,res);
 463
 464   curl_easy_setopt(p.curl, CURLOPT_SSL_CTX_DATA, &p);
 465
 466   {
 467     int lu; int i=0;
 468     while ((lu = BIO_read (in,&binaryptr[i],tabLength-i)) >0 ) {
 469       i+=lu;
 470       if (i== tabLength) {
 471         tabLength+=100;
 472         binaryptr=(char*)realloc(binaryptr,tabLength); /* should be more careful */
 473       }
 474     }
 475     tabLength = i;
 476   }
 477   /* Now specify the POST binary data */
 478
 479   curl_easy_setopt(p.curl, CURLOPT_POSTFIELDS, binaryptr);
 480   curl_easy_setopt(p.curl, CURLOPT_POSTFIELDSIZE,(long)tabLength);
 481
 482
 483   /* Perform the request, res will get the return code */
 484
 485   BIO_printf(p.errorbio,"%d %s %d\n", __LINE__, "curl_easy_perform",
 486              res = curl_easy_perform(p.curl));
 487   {
 488     int result =curl_easy_getinfo(p.curl,CURLINFO_CONTENT_TYPE,&response);
 489     if( mimetypeaccept && p.verbose)
 490       if(!strcmp(mimetypeaccept,response))
 491         BIO_printf(p.errorbio,"the response has a correct mimetype : %s\n",
 492                    response);
 493       else
 494         BIO_printf(p.errorbio,"the reponse doesn\'t has an acceptable "
 495                    "mime type, it is %s instead of %s\n",
 496                    response,mimetypeaccept);
 497   }
 498
 499   /*** code d'erreur si accept mime ***, egalement code return HTTP != 200 ***/
 500
 501 /* free the header list*/
 502
 503   curl_slist_free_all(headers);
 504
 505   /* always cleanup */
 506   curl_easy_cleanup(p.curl);
 507
 508   BIO_free(in);
 509   BIO_free(out);
 510   return (EXIT_SUCCESS);
 511
 512   err: BIO_printf(p.errorbio,"error");
 513   exit(1);
 514 }