X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/db3f7b6972f3b003c0413b78afcfbe295ffe0b97..4ed67f68df666fe38076e3bfd2183db71e742c7a:/src/src/tls.c

diff --git a/src/src/tls.c b/src/src/tls.c
index 23e9d4111..a541a3c7a 100644
--- a/src/src/tls.c
+++ b/src/src/tls.c
@@ -19,9 +19,16 @@ functions from the OpenSSL or GNU TLS libraries. */
 #include "exim.h"
 #include "transports/smtp.h"
 
-#if defined(MACRO_PREDEF) && defined(SUPPORT_TLS)
-# ifndef USE_GNUTLS
-#  include "macro_predef.h"
+#if !defined(DISABLE_TLS) && !defined(USE_OPENSSL) && !defined(USE_GNUTLS)
+# error One of USE_OPENSSL or USE_GNUTLS must be defined for a TLS build
+#endif
+
+
+#if defined(MACRO_PREDEF) && !defined(DISABLE_TLS)
+# include "macro_predef.h"
+# ifdef USE_GNUTLS
+#  include "tls-gnu.c"
+# else
 #  include "tls-openssl.c"
 # endif
 #endif
@@ -35,7 +42,7 @@ reference itself to stop picky compilers complaining that it is unused, and put
 in a dummy argument to stop even pickier compilers complaining about infinite
 loops. */
 
-#ifndef SUPPORT_TLS
+#ifdef DISABLE_TLS
 static void dummy(int x) { dummy(x-1); }
 #else
 
@@ -46,7 +53,7 @@ We're moving away from this; GnuTLS is already using a state, which
 can switch, so we can do TLS callouts during ACLs. */
 
 static const int ssl_xfer_buffer_size = 4096;
-#ifndef USE_GNUTLS
+#ifdef USE_OPENSSL
 static uschar *ssl_xfer_buffer = NULL;
 static int ssl_xfer_buffer_lwm = 0;
 static int ssl_xfer_buffer_hwm = 0;
@@ -120,14 +127,14 @@ tzset();
 #ifdef USE_GNUTLS
 # include "tls-gnu.c"
 # include "tlscert-gnu.c"
-
 # define ssl_xfer_buffer (state_server.xfer_buffer)
 # define ssl_xfer_buffer_lwm (state_server.xfer_buffer_lwm)
 # define ssl_xfer_buffer_hwm (state_server.xfer_buffer_hwm)
 # define ssl_xfer_eof (state_server.xfer_eof)
 # define ssl_xfer_error (state_server.xfer_error)
+#endif
 
-#else
+#ifdef USE_OPENSSL
 # include "tls-openssl.c"
 # include "tlscert-openssl.c"
 #endif
@@ -215,7 +222,7 @@ return ssl_xfer_buffer_lwm < ssl_xfer_buffer_hwm;
 }
 
 
-#endif  /* SUPPORT_TLS */
+#endif  /*DISABLE_TLS*/
 
 void
 tls_modify_variables(tls_support * dest_tsp)
@@ -224,13 +231,13 @@ modify_variable(US"tls_bits",                 &dest_tsp->bits);
 modify_variable(US"tls_certificate_verified", &dest_tsp->certificate_verified);
 modify_variable(US"tls_cipher",               &dest_tsp->cipher);
 modify_variable(US"tls_peerdn",               &dest_tsp->peerdn);
-#if defined(SUPPORT_TLS) && !defined(USE_GNUTLS)
+#ifdef USE_OPENSSL
 modify_variable(US"tls_sni",                  &dest_tsp->sni);
 #endif
 }
 
 
-#ifdef SUPPORT_TLS
+#ifndef DISABLE_TLS
 /************************************************
 *	TLS certificate name operations         *
 ************************************************/
@@ -362,7 +369,41 @@ else if ((subjdn = tls_cert_subject(cert, NULL)))
   }
 return FALSE;
 }
-#endif	/*SUPPORT_TLS*/
+
+
+/* Environment cleanup: The GnuTLS library uses SSLKEYLOGFILE in the environment
+and writes a file by that name.  Our OpenSSL code does the same, using keying
+info from the library API.
+The GnuTLS support only works if exim is run by root, not taking advantage of
+the setuid bit.
+You can use either the external environment (modulo the keep_environment config)
+or the add_environment config option for SSLKEYLOGFILE; the latter takes
+precedence.
+
+If the path is absolute, require it starts with the spooldir; otherwise delete
+the env variable.  If relative, prefix the spooldir.
+*/
+void
+tls_clean_env(void)
+{
+uschar * path = US getenv("SSLKEYLOGFILE");
+if (path)
+  if (!*path)
+    unsetenv("SSLKEYLOGFILE");
+  else if (*path != '/')
+    {
+    DEBUG(D_tls)
+      debug_printf("prepending spooldir to  env SSLKEYLOGFILE\n");
+    setenv("SSLKEYLOGFILE", CCS string_sprintf("%s/%s", spool_directory, path), 1);
+    }
+  else if (Ustrncmp(path, spool_directory, Ustrlen(spool_directory)) != 0)
+    {
+    DEBUG(D_tls)
+      debug_printf("removing env SSLKEYLOGFILE=%s: not under spooldir\n", path);
+    unsetenv("SSLKEYLOGFILE");
+    }
+}
+#endif	/*!DISABLE_TLS*/
 #endif	/*!MACRO_PREDEF*/
 
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