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  * Output level:
  10  *     0 = nothing,
  11  *     1 = minimal, just errors,
  12  *     2 = minimal, all steps,
  13  *     3 = detail, all steps */
  14 static unsigned int cb_ssl_verify_level = 1;
  15
  16 /* Other static rubbish (to mirror s_cb.c where required) */
  17 static int int_verify_depth = 10;
  18
  19 /*
  20  * This function is largely borrowed from the one used in OpenSSL's
  21  * "s_client" and "s_server" utilities.
  22  */
  23 void cb_ssl_info(const SSL *s, int where, int ret)
  24 {
  25     const char *str1, *str2;
  26     int w;
  27
  28     if (!fp_cb_ssl_info)
  29         return;
  30
  31     w = where & ~SSL_ST_MASK;
  32     str1 = (w & SSL_ST_CONNECT ? "SSL_connect" : (w & SSL_ST_ACCEPT ?
  33                                                   "SSL_accept" :
  34                                                   "undefined")), str2 =
  35         SSL_state_string_long(s);
  36
  37     if (where & SSL_CB_LOOP)
  38         fprintf(fp_cb_ssl_info, "(%s) %s\n", str1, str2);
  39     else if (where & SSL_CB_EXIT) {
  40         if (ret == 0)
  41             fprintf(fp_cb_ssl_info, "(%s) failed in %s\n", str1, str2);
  42         /*
  43          * In a non-blocking model, we get a few of these "error"s simply
  44          * because we're calling "reads" and "writes" on the state-machine
  45          * that are virtual NOPs simply to avoid wasting the time seeing if
  46          * we *should* call them. Removing this case makes the "-out_state"
  47          * output a lot easier on the eye.
  48          */
  49 # if 0
  50         else if (ret < 0)
  51             fprintf(fp_cb_ssl_info, "%s:error in %s\n", str1, str2);
  52 # endif
  53     }
  54 }
  55
  56 void cb_ssl_info_set_output(FILE *fp)
  57 {
  58     fp_cb_ssl_info = fp;
  59 }
  60
  61 static const char *int_reason_no_issuer =
  62     "X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT";
  63 static const char *int_reason_not_yet = "X509_V_ERR_CERT_NOT_YET_VALID";
  64 static const char *int_reason_before =
  65     "X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD";
  66 static const char *int_reason_expired = "X509_V_ERR_CERT_HAS_EXPIRED";
  67 static const char *int_reason_after =
  68     "X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD";
  69
  70 /* Stolen wholesale from apps/s_cb.c :-) And since then, mutilated ... */
  71 int cb_ssl_verify(int ok, X509_STORE_CTX *ctx)
  72 {
  73     char buf1[256];             /* Used for the subject name */
  74     char buf2[256];             /* Used for the issuer name */
  75     const char *reason = NULL;  /* Error reason (if any) */
  76     X509 *err_cert;
  77     int err, depth;
  78
  79     if (!fp_cb_ssl_verify || (cb_ssl_verify_level == 0))
  80         return ok;
  81     err_cert = X509_STORE_CTX_get_current_cert(ctx);
  82     err = X509_STORE_CTX_get_error(ctx);
  83     depth = X509_STORE_CTX_get_error_depth(ctx);
  84
  85     buf1[0] = buf2[0] = '\0';
  86     /* Fill buf1 */
  87     X509_NAME_oneline(X509_get_subject_name(err_cert), buf1, 256);
  88     /* Fill buf2 */
  89     X509_NAME_oneline(X509_get_issuer_name(ctx->current_cert), buf2, 256);
  90     switch (ctx->error) {
  91     case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
  92         reason = int_reason_no_issuer;
  93         break;
  94     case X509_V_ERR_CERT_NOT_YET_VALID:
  95         reason = int_reason_not_yet;
  96         break;
  97     case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
  98         reason = int_reason_before;
  99         break;
 100     case X509_V_ERR_CERT_HAS_EXPIRED:
 101         reason = int_reason_expired;
 102         break;
 103     case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
 104         reason = int_reason_after;
 105         break;
 106     }
 107
 108     if ((cb_ssl_verify_level == 1) && ok)
 109         return ok;
 110     fprintf(fp_cb_ssl_verify, "chain-depth=%d, ", depth);
 111     if (reason)
 112         fprintf(fp_cb_ssl_verify, "error=%s\n", reason);
 113     else
 114         fprintf(fp_cb_ssl_verify, "error=%d\n", err);
 115     if (cb_ssl_verify_level < 3)
 116         return ok;
 117     fprintf(fp_cb_ssl_verify, "--> subject = %s\n", buf1);
 118     fprintf(fp_cb_ssl_verify, "--> issuer  = %s\n", buf2);
 119     if (!ok)
 120         fprintf(fp_cb_ssl_verify, "--> verify error:num=%d:%s\n", err,
 121                 X509_verify_cert_error_string(err));
 122     fprintf(fp_cb_ssl_verify, "--> verify return:%d\n", ok);
 123     return ok;
 124 }
 125
 126 void cb_ssl_verify_set_output(FILE *fp)
 127 {
 128     fp_cb_ssl_verify = fp;
 129 }
 130
 131 void cb_ssl_verify_set_depth(unsigned int verify_depth)
 132 {
 133     int_verify_depth = verify_depth;
 134 }
 135
 136 void cb_ssl_verify_set_level(unsigned int level)
 137 {
 138     if (level < 4)
 139         cb_ssl_verify_level = level;
 140 }
 141
 142 RSA *cb_generate_tmp_rsa(SSL *s, int is_export, int keylength)
 143 {
 144     /*
 145      * TODO: Perhaps make it so our global key can be generated on-the-fly
 146      * after certain intervals?
 147      */
 148     static RSA *rsa_tmp = NULL;
 149     if (!rsa_tmp)
 150         rsa_tmp = RSA_generate_key(keylength, RSA_F4, NULL, NULL);
 151     return rsa_tmp;
 152 }
 153
 154 #endif                          /* !defined(NO_OPENSSL) */