Vérifier le code d'erreur = 20 : impossible d'obtenir le certificat de l'émetteur local

J'ai une chaîne de certificats du serveur:

Certificate chain
 0 s:/******/O=Foobar International BV/OU****
   i:/C=US/O=Symantec Corporation/OU=Symantec Trust Network/****

 1 s:/C=US/O=Symantec Corporation/OU=Symantec Trust Network/****
   i:/C=US/O=VeriSign, Inc./OU=VeriSign Trust Network/OU=**** - G5

 2 s:/C=US/O=VeriSign, Inc./OU=VeriSign Trust Network/OU=**** - G5
   i:/C=US/O=VeriSign, Inc./OU=Class 3 Public Primary Certification Authority

Et mon certificat CA racine est:

   s:/C=US/O=Symantec Corporation/OU=Symantec Trust Network/****
   i:/C=US/O=VeriSign, Inc./OU=VeriSign Trust Network/OU=**** - G5

Et je suis à l'aide de cet extrait de code pour vérifier le certificat:

//gcc -lssl -lcrypto -o certverify certverify.c 

#include <openssl/ssl.h>
#include <openssl/asn1.h>
#include <openssl/bio.h>
#include <openssl/x509.h>
#include <openssl/x509_vfy.h>
#include <openssl/pem.h>
#include <openssl/x509v3.h>
#include <openssl/err.h>
#include <openssl/conf.h>
#include <string.h>

int main() {

  const char ca_bundlestr[] = "./ca-bundle.pem";
  const char cert_filestr[] = "./cert-file.pem";

  BIO              *certbio = NULL;
  BIO               *outbio = NULL;
  X509          *error_cert = NULL;
  X509                *cert = NULL;
  X509_NAME    *certsubject = NULL;
  X509_STORE         *store = NULL;
  X509_STORE_CTX  *vrfy_ctx = NULL;
  int ret;

  /* ---------------------------------------------------------- *
   * These function calls initialize openssl for correct work.  *
   * ---------------------------------------------------------- */
  OpenSSL_add_all_algorithms();
  ERR_load_BIO_strings();
  ERR_load_crypto_strings();

  /* ---------------------------------------------------------- *
   * Create the Input/Output BIO's.                             *
   * ---------------------------------------------------------- */
  certbio = BIO_new(BIO_s_file());
  outbio  = BIO_new_fp(stdout, BIO_NOCLOSE);

  /* ---------------------------------------------------------- *
   * Initialize the global certificate validation store object. *
   * ---------------------------------------------------------- */
  if (!(store=X509_STORE_new()))
     BIO_printf(outbio, "Error creating X509_STORE_CTX object\n");

  /* ---------------------------------------------------------- *
   * Create the context structure for the validation operation. *
   * ---------------------------------------------------------- */
  vrfy_ctx = X509_STORE_CTX_new();

  /* ---------------------------------------------------------- *
   * Load the certificate and cacert chain from file (PEM).     *
   * ---------------------------------------------------------- */
  ret = BIO_read_filename(certbio, cert_filestr);
  if (! (cert = PEM_read_bio_X509(certbio, NULL, 0, NULL))) {
    BIO_printf(outbio, "Error loading cert into memory\n");
    exit(-1);
  }

  ret = X509_STORE_load_locations(store, ca_bundlestr, NULL);
  if (ret != 1)
    BIO_printf(outbio, "Error loading CA cert or chain file\n");

  /* ---------------------------------------------------------- *
   * Initialize the ctx structure for a verification operation: *
   * Set the trusted cert store, the unvalidated cert, and any  *
   * potential certs that could be needed (here we set it NULL) *
   * ---------------------------------------------------------- */
  X509_STORE_CTX_init(vrfy_ctx, store, cert, NULL);

  /* ---------------------------------------------------------- *
   * Check the complete cert chain can be build and validated.  *
   * Returns 1 on success, 0 on verification failures, and -1   *
   * for trouble with the ctx object (i.e. missing certificate) *
   * ---------------------------------------------------------- */
  ret = X509_verify_cert(vrfy_ctx);
  BIO_printf(outbio, "Verification return code: %d\n", ret);

  if(ret == 0 || ret == 1)
  BIO_printf(outbio, "Verification result text: %s\n",
             X509_verify_cert_error_string(vrfy_ctx->error));

  /* ---------------------------------------------------------- *
   * The error handling below shows how to get failure details  *
   * from the offending certificate.                            *
   * ---------------------------------------------------------- */
  if(ret == 0) {
    /*  get the offending certificate causing the failure */
    error_cert  = X509_STORE_CTX_get_current_cert(vrfy_ctx);
    certsubject = X509_NAME_new();
    certsubject = X509_get_subject_name(error_cert);
    BIO_printf(outbio, "Verification failed cert:\n");
    X509_NAME_print_ex(outbio, certsubject, 0, XN_FLAG_MULTILINE);
    BIO_printf(outbio, "\n");
  }

  /* ---------------------------------------------------------- *
   * Free up all structures                                     *
   * ---------------------------------------------------------- */
  X509_STORE_CTX_free(vrfy_ctx);
  X509_STORE_free(store);
  X509_free(cert);
  BIO_free_all(certbio);
  BIO_free_all(outbio);
  exit(0);
}

Mais ce code de retour de sortie suivants:

Verification return code: 0
Verification result text: unable to get issuer certificate
Verification failed cert:
countryName               = US
organizationName          = Symantec Corporation
organizationalUnitName    = Symantec Trust Network
commonName                = Symantec Class 3 Secure Server CA - G4

Quel est le problème ici?

OriginalL'auteur Kaidul | 2014-12-22