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cb.c

#include "tunala.h"

#ifndef NO_OPENSSL

/* For callbacks generating output, here are their file-descriptors. */
static FILE *fp_cb_ssl_info = NULL;
static FILE *fp_cb_ssl_verify = NULL;
/* Output level:
 *     0 = nothing,
 *     1 = minimal, just errors,
 *     2 = minimal, all steps,
 *     3 = detail, all steps */
static unsigned int cb_ssl_verify_level = 1;

/* Other static rubbish (to mirror s_cb.c where required) */
static int int_verify_depth = 10;

/* This function is largely borrowed from the one used in OpenSSL's "s_client"
 * and "s_server" utilities. */
void cb_ssl_info(const SSL *s, int where, int ret)
{
      const char *str1, *str2;
      int w;

      if(!fp_cb_ssl_info)
            return;

      w = where & ~SSL_ST_MASK;
      str1 = (w & SSL_ST_CONNECT ? "SSL_connect" : (w & SSL_ST_ACCEPT ?
                        "SSL_accept" : "undefined")),
      str2 = SSL_state_string_long(s);

      if (where & SSL_CB_LOOP)
            fprintf(fp_cb_ssl_info, "(%s) %s\n", str1, str2);
      else if (where & SSL_CB_EXIT) {
            if (ret == 0)
                  fprintf(fp_cb_ssl_info, "(%s) failed in %s\n", str1, str2);
/* In a non-blocking model, we get a few of these "error"s simply because we're
 * calling "reads" and "writes" on the state-machine that are virtual NOPs
 * simply to avoid wasting the time seeing if we *should* call them. Removing
 * this case makes the "-out_state" output a lot easier on the eye. */
#if 0
            else if (ret < 0)
                  fprintf(fp_cb_ssl_info, "%s:error in %s\n", str1, str2);
#endif
      }
}

void cb_ssl_info_set_output(FILE *fp)
{
      fp_cb_ssl_info = fp;
}

static const char *int_reason_no_issuer = "X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT";
static const char *int_reason_not_yet = "X509_V_ERR_CERT_NOT_YET_VALID";
static const char *int_reason_before = "X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD";
static const char *int_reason_expired = "X509_V_ERR_CERT_HAS_EXPIRED";
static const char *int_reason_after = "X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD";

/* Stolen wholesale from apps/s_cb.c :-) And since then, mutilated ... */
int cb_ssl_verify(int ok, X509_STORE_CTX *ctx)
{
      char buf1[256]; /* Used for the subject name */
      char buf2[256]; /* Used for the issuer name */
      const char *reason = NULL; /* Error reason (if any) */
      X509 *err_cert;
      int err, depth;

      if(!fp_cb_ssl_verify || (cb_ssl_verify_level == 0))
            return ok;
      err_cert = X509_STORE_CTX_get_current_cert(ctx);
      err = X509_STORE_CTX_get_error(ctx);
      depth = X509_STORE_CTX_get_error_depth(ctx);

      buf1[0] = buf2[0] = '\0';
      /* Fill buf1 */
      X509_NAME_oneline(X509_get_subject_name(err_cert), buf1, 256);
      /* Fill buf2 */
      X509_NAME_oneline(X509_get_issuer_name(ctx->current_cert), buf2, 256);
      switch (ctx->error) {
      case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
            reason = int_reason_no_issuer;
            break;
      case X509_V_ERR_CERT_NOT_YET_VALID:
            reason = int_reason_not_yet;
            break;
      case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
            reason = int_reason_before;
            break;
      case X509_V_ERR_CERT_HAS_EXPIRED:
            reason = int_reason_expired;
            break;
      case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
            reason = int_reason_after;
            break;
      }

      if((cb_ssl_verify_level == 1) && ok)
            return ok;
      fprintf(fp_cb_ssl_verify, "chain-depth=%d, ", depth);
      if(reason)
            fprintf(fp_cb_ssl_verify, "error=%s\n", reason);
      else
            fprintf(fp_cb_ssl_verify, "error=%d\n", err);
      if(cb_ssl_verify_level < 3)
            return ok;
      fprintf(fp_cb_ssl_verify, "--> subject = %s\n", buf1);
      fprintf(fp_cb_ssl_verify, "--> issuer  = %s\n", buf2);
      if(!ok)
            fprintf(fp_cb_ssl_verify,"--> verify error:num=%d:%s\n",err,
                  X509_verify_cert_error_string(err));
      fprintf(fp_cb_ssl_verify, "--> verify return:%d\n",ok);
      return ok;
}

void cb_ssl_verify_set_output(FILE *fp)
{
      fp_cb_ssl_verify = fp;
}

void cb_ssl_verify_set_depth(unsigned int verify_depth)
{
      int_verify_depth = verify_depth;
}

void cb_ssl_verify_set_level(unsigned int level)
{
      if(level < 4)
            cb_ssl_verify_level = level;
}

RSA *cb_generate_tmp_rsa(SSL *s, int is_export, int keylength)
{
      /* TODO: Perhaps make it so our global key can be generated on-the-fly
       * after certain intervals? */
      static RSA *rsa_tmp = NULL;
      if(!rsa_tmp)
            rsa_tmp = RSA_generate_key(keylength, RSA_F4, NULL, NULL);
      return rsa_tmp;
}

#endif /* !defined(NO_OPENSSL) */


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