Capture the knowlege that verification succeeded

[exim.git] / src / src / tls-openssl.c

diff --git a/src/src/tls-openssl.c b/src/src/tls-openssl.c
index 201636db046b34a354c33a7ba72358d129bc55e8..e37b1add5001ad6ba8b6a2f02f07dee08f8b34df 100644 (file)
--- a/src/src/tls-openssl.c
+++ b/src/src/tls-openssl.c
@@ -361,7 +361,7 @@ else
       return 0;                                /* reject */
       }
 # endif
-#endif
+#endif /*EXPERIMENTAL_CERTNAMES*/
 
   DEBUG(D_tls) debug_printf("SSL%s verify ok: depth=0 SN=%s\n",
     *calledp ? "" : " authenticated", txt);
@@ -385,6 +385,28 @@ return verify_callback(state, x509ctx, &tls_in, &server_verify_callback_called,
 }
 
 
+#ifdef EXPERIMENTAL_DANE
+/* This gets called *by* the dane library verify callback, which interposes
+itself.
+*/
+static int
+verify_callback_client_dane(int state, X509_STORE_CTX * x509ctx)
+{
+X509 * cert = X509_STORE_CTX_get_current_cert(x509ctx);
+static uschar txt[256];
+
+X509_NAME_oneline(X509_get_subject_name(cert), CS txt, sizeof(txt));
+
+DEBUG(D_tls) debug_printf("verify_callback_client_dane: %s\n", txt);
+tls_out.peerdn = txt;
+tls_out.peercert = X509_dup(cert);
+
+if (state == 1)
+  tls_out.certificate_verified = TRUE;
+return 1;
+}
+#endif
+
 
 /*************************************************
 *           Information callback                 *
@@ -999,7 +1021,6 @@ return i;
 #endif /*!DISABLE_OCSP*/
 
 
-
 /*************************************************
 *            Initialize for TLS                  *
 *************************************************/
@@ -1618,15 +1639,8 @@ BOOL dane_required;
 #endif
 
 #ifdef EXPERIMENTAL_DANE
-/*XXX TBD: test for transport options, and for TLSA records */
-/*dane = TRUE;*/
-
-# ifdef notyet
 dane_required = verify_check_this_host(&ob->hosts_require_dane, NULL,
                          host->name, host->address, NULL) == OK;
-# else
-dane_required = FALSE;
-#endif
 
 if (host->dnssec == DS_YES)
   {
@@ -1637,11 +1651,10 @@ if (host->dnssec == DS_YES)
     {
     /* move this out to host.c given the similarity to dns_lookup() ? */
     uschar buffer[300];
-    int prefix_length; /* why do we want this? */
     uschar * fullname = buffer;
 
     /* TLSA lookup string */
-    (void)sprintf(CS buffer, "_%d._tcp.%n%.256s", host->port, &prefix_length,
+    (void)sprintf(CS buffer, "_%d._tcp.%.256s", host->port,
       host->name);
 
     switch (rc = dns_lookup(&tlsa_dnsa, buffer, T_TLSA, &fullname))
@@ -1653,7 +1666,7 @@ if (host->dnssec == DS_YES)
       case DNS_FAIL:
        if (dane_required)
          {
-         /* log that TLSA lookup failed */
+         log_write(0, LOG_MAIN, "DANE error: TLSA lookup failed");
          return FAIL;
          }
        break;
@@ -1661,7 +1674,7 @@ if (host->dnssec == DS_YES)
       case DNS_SUCCEED:
        if (!dns_is_secure(&tlsa_dnsa))
          {
-         /*log it - tlsa should never be non-dnssec */
+         log_write(0, LOG_MAIN, "DANE error: TLSA lookup not DNSSEC");
          return DEFER;
          }
        dane = TRUE;
@@ -1669,9 +1682,11 @@ if (host->dnssec == DS_YES)
       }
     }
   }
-else if (dane_required && !dane)
+else if (dane_required)
   {
-  /* log that dnssec pre-req failed.  Hmm - what? */
+  /*XXX a shame we only find this after making tcp & smtp connection */
+  /* move the test earlier? */
+  log_write(0, LOG_MAIN, "DANE error: previous lookup not DNSSEC");
   return FAIL;
   }
 
@@ -1719,10 +1734,12 @@ if (expciphers != NULL)
 #ifdef EXPERIMENTAL_DANE
 if (dane)
   {
+  SSL_CTX_set_verify(client_ctx, SSL_VERIFY_PEER, verify_callback_client_dane);
+
   if (!DANESSL_library_init())
-    return tls_error(US"library init", host, US"DANE library error");
+    return tls_error(US"library init", host, NULL);
   if (DANESSL_CTX_init(client_ctx) <= 0)
-    return tls_error(US"context init", host, US"DANE library error");
+    return tls_error(US"context init", host, NULL);
   }
 else
 
@@ -1783,7 +1800,7 @@ if (dane)
   uschar * hostnames[2] = { host->name, NULL };
 
   if (DANESSL_init(client_ssl, NULL, hostnames) != 1)
-    return tls_error(US"hostnames load", host, US"DANE library error");
+    return tls_error(US"hostnames load", host, NULL);
 
   for (rr = dns_next_rr(&tlsa_dnsa, &dnss, RESET_ANSWERS);
        rr;
@@ -1802,8 +1819,8 @@ if (dane)
       {
       default: /* log bad */ return FAIL;
       case 0:  mdname = NULL; break;
-      case 1:  mdname = "SHA2-256"; break;
-      case 2:  mdname = "SHA2-512"; break;
+      case 1:  mdname = "sha256"; break;
+      case 2:  mdname = "sha512"; break;
       }
 
     switch (DANESSL_add_tlsa(client_ssl,
@@ -1811,8 +1828,8 @@ if (dane)
                mdname, p, rr->size - (p - rr->data)))
       {
       default:
-      case 0:  /* action not taken; log error */
-        return FAIL;
+      case 0:  /* action not taken */
+       return tls_error(US"tlsa load", host, NULL);
       case 1:  break;
       }
     }