demos/tunala/cb.c

   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
   9 /* Other static rubbish (to mirror s_cb.c where required) */
  10 static int int_verify_depth = 10;
  11 static int int_verify_error = X509_V_OK;
  12
  13 /* This function is largely borrowed from the one used in OpenSSL's "s_client"
  14  * and "s_server" utilities. */
  15 void cb_ssl_info(SSL *s, int where, int ret)
  16 {
  17         char *str1, *str2;
  18         int w;
  19
  20         if(!fp_cb_ssl_info)
  21                 return;
  22
  23         w = where & ~SSL_ST_MASK;
  24         str1 = (w & SSL_ST_CONNECT ? "SSL_connect" : (w & SSL_ST_ACCEPT ?
  25                                 "SSL_accept" : "undefined")),
  26         str2 = SSL_state_string_long(s);
  27
  28         if (where & SSL_CB_LOOP)
  29                 fprintf(fp_cb_ssl_info, "%s:%s\n", str1, str2);
  30         else if (where & SSL_CB_EXIT) {
  31                 if (ret == 0)
  32                         fprintf(fp_cb_ssl_info, "%s:failed in %s\n", str1, str2);
  33                 else if (ret < 0)
  34                         fprintf(fp_cb_ssl_info, "%s:error in %s\n", str1, str2);
  35         }
  36 }
  37
  38 void cb_ssl_info_set_output(FILE *fp)
  39 {
  40         fp_cb_ssl_info = fp;
  41 }
  42
  43 /* Stolen wholesale from apps/s_cb.c :-) */
  44 int cb_ssl_verify(int ok, X509_STORE_CTX *ctx)
  45 {
  46         char buf[256];
  47         X509 *err_cert;
  48         int err, depth;
  49         BIO *bio;
  50
  51         if(!fp_cb_ssl_verify)
  52                 return ok;
  53         /* There's no <damned>FILE*</damned> version of ASN1_TIME_print */
  54         bio = BIO_new_fp(fp_cb_ssl_verify, BIO_NOCLOSE);
  55         err_cert = X509_STORE_CTX_get_current_cert(ctx);
  56         err = X509_STORE_CTX_get_error(ctx);
  57         depth = X509_STORE_CTX_get_error_depth(ctx);
  58
  59         X509_NAME_oneline(X509_get_subject_name(err_cert), buf, 256);
  60         fprintf(fp_cb_ssl_verify, "depth=%d %s\n", depth, buf);
  61         if(!ok) {
  62                 fprintf(fp_cb_ssl_verify,"verify error:num=%d:%s\n",err,
  63                         X509_verify_cert_error_string(err));
  64                 if((int)int_verify_depth >= depth)
  65                         int_verify_error = err;
  66                 else
  67                         int_verify_error = X509_V_ERR_CERT_CHAIN_TOO_LONG;
  68         }
  69         switch (ctx->error) {
  70         case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
  71                 X509_NAME_oneline(X509_get_issuer_name(ctx->current_cert),
  72                                 buf, 256);
  73                 fprintf(fp_cb_ssl_verify, "issuer= %s\n", buf);
  74                 break;
  75         case X509_V_ERR_CERT_NOT_YET_VALID:
  76         case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
  77                 fprintf(fp_cb_ssl_verify, "notBefore=");
  78                 ASN1_TIME_print(bio, X509_get_notBefore(ctx->current_cert));
  79                 fprintf(fp_cb_ssl_verify, "\n");
  80                 break;
  81         case X509_V_ERR_CERT_HAS_EXPIRED:
  82         case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
  83                 fprintf(fp_cb_ssl_verify, "notAfter=");
  84                 ASN1_TIME_print(bio, X509_get_notAfter(ctx->current_cert));
  85                 fprintf(fp_cb_ssl_verify, "\n");
  86                 break;
  87         }
  88         fprintf(fp_cb_ssl_verify, "verify return:%d\n",ok);
  89         return ok;
  90 }
  91
  92 void cb_ssl_verify_set_output(FILE *fp)
  93 {
  94         fp_cb_ssl_verify = fp;
  95 }
  96
  97 void cb_ssl_verify_set_depth(unsigned int verify_depth)
  98 {
  99         int_verify_depth = verify_depth;
 100 }
 101
 102 #endif /* !defined(NO_OPENSSL) */
 103