http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=374327

GPL code linked against OpenSSL without exception

[ Alejandro Rios ]
* Initial port from openssl to gnutls
 
[ Anibal Monsalve Salazar ]
* configure: replaced -lssl with /usr/lib/libgnutls-openssl.so.
* ssmtp.c: replaced SSL_CTX_use_certificate_chain_file with
  SSL_CTX_use_certificate_file and marked SSL_CTX_check_private_key
  as not used.

Alejandro Rios <alerios@debian.org>
Anibal Monsalve Salazar <anibal@debian.org>

Index: ssmtp-2.64/ssmtp.c
===================================================================
--- ssmtp-2.64.orig/ssmtp.c
+++ ssmtp-2.64/ssmtp.c
@@ -27,12 +27,16 @@
 #include <ctype.h>
 #include <netdb.h>
 #ifdef HAVE_SSL
+#ifdef HAVE_GNUTLS
+#include <gnutls/openssl.h>
+#else
 #include <openssl/crypto.h>
 #include <openssl/x509.h>
 #include <openssl/pem.h>
 #include <openssl/ssl.h>
 #include <openssl/err.h>
 #endif
+#endif
 #ifdef MD5AUTH
 #include "md5auth/hmac_md5.h"
 #endif
@@ -1154,7 +1158,11 @@ int smtp_open(char *host, int port)
 	}
 
 	if(use_cert == True) { 
+#ifdef HAVE_GNUTLS
+		if(SSL_CTX_use_certificate_file(ctx, tls_cert, SSL_FILETYPE_PEM) <= 0) {
+#else
 		if(SSL_CTX_use_certificate_chain_file(ctx, tls_cert) <= 0) {
+#endif
 			perror("Use certfile");
 			return(-1);
 		}
@@ -1164,10 +1172,12 @@ int smtp_open(char *host, int port)
 			return(-1);
 		}
 
+#ifndef HAVE_GNUTLS
 		if(!SSL_CTX_check_private_key(ctx)) {
 			log_event(LOG_ERR, "Private key does not match the certificate public key\n");
 			return(-1);
 		}
+#endif
 	}
 #endif
 
Index: ssmtp-2.64/configure.in
===================================================================
--- ssmtp-2.64.orig/configure.in
+++ ssmtp-2.64/configure.in
@@ -50,11 +50,17 @@ enableval=""
 
 AC_ARG_ENABLE(ssl,
 [  --enable-ssl           support for secure connection to mail server])
-if test x$enableval = xyes ; then
-	AC_DEFINE(HAVE_SSL)
-	LIBS="$LIBS -lssl -lcrypto"
+AC_ARG_WITH([gnutls],
+  AS_HELP_STRING([--with-gnutls], [Use GnuTLS for SSL support]))
+if test x$enable_ssl = "xyes" ; then
+       	AC_DEFINE(HAVE_SSL)
+        if test "x$with_gnutls" != "xyes"; then
+        	LIBS="$LIBS -lssl -lcrypto"
+        else
+                AC_DEFINE([HAVE_GNUTLS])
+                LIBS="$LIBS -lgnutls-openssl"
+        fi
 fi
-enableval=""
 
 AC_ARG_ENABLE(inet6,
 [  --enable-inet6         support for IPv6 transport])