1: #include "tunala.h"
    2: 
    3: #ifndef NO_OPENSSL
    4: 
    5: /* For callbacks generating output, here are their file-descriptors. */
    6: static FILE *fp_cb_ssl_info = NULL;
    7: static FILE *fp_cb_ssl_verify = NULL;
    8: /* Output level:
    9:  *     0 = nothing,
   10:  *     1 = minimal, just errors,
   11:  *     2 = minimal, all steps,
   12:  *     3 = detail, all steps */
   13: static unsigned int cb_ssl_verify_level = 1;
   14: 
   15: /* Other static rubbish (to mirror s_cb.c where required) */
   16: static int int_verify_depth = 10;
   17: 
   18: /* This function is largely borrowed from the one used in OpenSSL's "s_client"
   19:  * and "s_server" utilities. */
   20: void cb_ssl_info(const SSL *s, int where, int ret)
   21: {
   22:         const char *str1, *str2;
   23:         int w;
   24: 
   25:         if(!fp_cb_ssl_info)
   26:                 return;
   27: 
   28:         w = where & ~SSL_ST_MASK;
   29:         str1 = (w & SSL_ST_CONNECT ? "SSL_connect" : (w & SSL_ST_ACCEPT ?
   30:                                 "SSL_accept" : "undefined")),
   31:         str2 = SSL_state_string_long(s);
   32: 
   33:         if (where & SSL_CB_LOOP)
   34:                 fprintf(fp_cb_ssl_info, "(%s) %s\n", str1, str2);
   35:         else if (where & SSL_CB_EXIT) {
   36:                 if (ret == 0)
   37:                         fprintf(fp_cb_ssl_info, "(%s) failed in %s\n", str1, str2);
   38: /* In a non-blocking model, we get a few of these "error"s simply because we're
   39:  * calling "reads" and "writes" on the state-machine that are virtual NOPs
   40:  * simply to avoid wasting the time seeing if we *should* call them. Removing
   41:  * this case makes the "-out_state" output a lot easier on the eye. */
   42: #if 0
   43:                 else if (ret < 0)
   44:                         fprintf(fp_cb_ssl_info, "%s:error in %s\n", str1, str2);
   45: #endif
   46:         }
   47: }
   48: 
   49: void cb_ssl_info_set_output(FILE *fp)
   50: {
   51:         fp_cb_ssl_info = fp;
   52: }
   53: 
   54: static const char *int_reason_no_issuer = "X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT";
   55: static const char *int_reason_not_yet = "X509_V_ERR_CERT_NOT_YET_VALID";
   56: static const char *int_reason_before = "X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD";
   57: static const char *int_reason_expired = "X509_V_ERR_CERT_HAS_EXPIRED";
   58: static const char *int_reason_after = "X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD";
   59: 
   60: /* Stolen wholesale from apps/s_cb.c :-) And since then, mutilated ... */
   61: int cb_ssl_verify(int ok, X509_STORE_CTX *ctx)
   62: {
   63:         char buf1[256]; /* Used for the subject name */
   64:         char buf2[256]; /* Used for the issuer name */
   65:         const char *reason = NULL; /* Error reason (if any) */
   66:         X509 *err_cert;
   67:         int err, depth;
   68: 
   69:         if(!fp_cb_ssl_verify || (cb_ssl_verify_level == 0))
   70:                 return ok;
   71:         err_cert = X509_STORE_CTX_get_current_cert(ctx);
   72:         err = X509_STORE_CTX_get_error(ctx);
   73:         depth = X509_STORE_CTX_get_error_depth(ctx);
   74: 
   75:         buf1[0] = buf2[0] = '\0';
   76:         /* Fill buf1 */
   77:         X509_NAME_oneline(X509_get_subject_name(err_cert), buf1, 256);
   78:         /* Fill buf2 */
   79:         X509_NAME_oneline(X509_get_issuer_name(ctx->current_cert), buf2, 256);
   80:         switch (ctx->error) {
   81:         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
   82:                 reason = int_reason_no_issuer;
   83:                 break;
   84:         case X509_V_ERR_CERT_NOT_YET_VALID:
   85:                 reason = int_reason_not_yet;
   86:                 break;
   87:         case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
   88:                 reason = int_reason_before;
   89:                 break;
   90:         case X509_V_ERR_CERT_HAS_EXPIRED:
   91:                 reason = int_reason_expired;
   92:                 break;
   93:         case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
   94:                 reason = int_reason_after;
   95:                 break;
   96:         }
   97: 
   98:         if((cb_ssl_verify_level == 1) && ok)
   99:                 return ok;
  100:         fprintf(fp_cb_ssl_verify, "chain-depth=%d, ", depth);
  101:         if(reason)
  102:                 fprintf(fp_cb_ssl_verify, "error=%s\n", reason);
  103:         else
  104:                 fprintf(fp_cb_ssl_verify, "error=%d\n", err);
  105:         if(cb_ssl_verify_level < 3)
  106:                 return ok;
  107:         fprintf(fp_cb_ssl_verify, "--> subject = %s\n", buf1);
  108:         fprintf(fp_cb_ssl_verify, "--> issuer  = %s\n", buf2);
  109:         if(!ok)
  110:                 fprintf(fp_cb_ssl_verify,"--> verify error:num=%d:%s\n",err,
  111:                         X509_verify_cert_error_string(err));
  112:         fprintf(fp_cb_ssl_verify, "--> verify return:%d\n",ok);
  113:         return ok;
  114: }
  115: 
  116: void cb_ssl_verify_set_output(FILE *fp)
  117: {
  118:         fp_cb_ssl_verify = fp;
  119: }
  120: 
  121: void cb_ssl_verify_set_depth(unsigned int verify_depth)
  122: {
  123:         int_verify_depth = verify_depth;
  124: }
  125: 
  126: void cb_ssl_verify_set_level(unsigned int level)
  127: {
  128:         if(level < 4)
  129:                 cb_ssl_verify_level = level;
  130: }
  131: 
  132: RSA *cb_generate_tmp_rsa(SSL *s, int is_export, int keylength)
  133: {
  134:         /* TODO: Perhaps make it so our global key can be generated on-the-fly
  135:          * after certain intervals? */
  136:         static RSA *rsa_tmp = NULL;
  137:         if(!rsa_tmp)
  138:                 rsa_tmp = RSA_generate_key(keylength, RSA_F4, NULL, NULL);
  139:         return rsa_tmp;
  140: }
  141: 
  142: #endif /* !defined(NO_OPENSSL) */
  143: