+static void
+tls_dump_keylog(SSL * ssl)
+{
+#ifdef EXIM_HAVE_OPENSSL_KEYLOG
+ BIO * bp = BIO_new(BIO_s_mem());
+ uschar * s = NULL;
+ int len;
+ SSL_SESSION_print_keylog(bp, SSL_get_session(ssl));
+ len = (int) BIO_get_mem_data(bp, CSS &s);
+ if (len > 0) debug_printf("%.*s", len, s);
+ BIO_free(bp);
+#endif
+}
+
+
+/* Channel-binding info for authenticators
+See description in https://paquier.xyz/postgresql-2/channel-binding-openssl/
+for pre-TLS1.3
+*/
+
+static void
+tls_get_channel_binding(SSL * ssl, tls_support * tlsp, const void * taintval)
+{
+uschar c, * s;
+size_t len;
+
+#ifdef EXIM_HAVE_EXPORT_CHNL_BNGNG
+if (SSL_version(ssl) > TLS1_2_VERSION)
+ {
+ /* It's not documented by OpenSSL how big the output buffer must be.
+ The OpenSSL testcases use 80 bytes but don't say why. The GnuTLS impl only
+ serves out 32B. RFC 9266 says it is 32B.
+ Interop fails unless we use the same each end. */
+ len = 32;
+
+ tlsp->channelbind_exporter = TRUE;
+ taintval = GET_UNTAINTED;
+ if (SSL_export_keying_material(ssl,
+ s = store_get((int)len, taintval), len,
+ "EXPORTER-Channel-Binding", (size_t) 24,
+ NULL, 0, 0) != 1)
+ len = 0;
+ }
+else
+#endif
+ {
+ len = SSL_get_peer_finished(ssl, &c, 0);
+ len = SSL_get_peer_finished(ssl, s = store_get((int)len, taintval), len);
+ }
+
+if (len > 0)
+ {
+ int old_pool = store_pool;
+ store_pool = POOL_PERM;
+ tlsp->channelbinding = b64encode_taint(CUS s, (int)len, taintval);
+ store_pool = old_pool;
+ DEBUG(D_tls) debug_printf("Have channel bindings cached for possible auth usage %p %p\n", tlsp->channelbinding, tlsp);
+ }
+}
+
+
git://git.exim.org / exim.git / blobdiff