From 71f02a3eb65b2996957faf81c2e54196a35f3c59 Mon Sep 17 00:00:00 2001
From: Jo-Philipp Wich <jo@mein.io>
Date: Fri, 10 Feb 2017 10:34:21 +0100
Subject: [PATCH] libopkg: add support for signature checking through usign

Adds a new configure switch "--enable-usign" which enables code to perform
package feed signature checking using an external "/usr/sbin/opkg-key" helper
program.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>
---
 configure.ac            |  9 +++++++++
 libopkg/opkg.c          |  2 +-
 libopkg/opkg_cmd.c      |  2 +-
 libopkg/opkg_download.c | 24 +++++++++++++++++++++++-
 libopkg/opkg_install.c  |  2 +-
 5 files changed, 35 insertions(+), 4 deletions(-)

diff --git a/configure.ac b/configure.ac
index 996bf6a..967a4d5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -169,6 +169,15 @@ if test "x$want_gpgme" = "xyes"; then
   fi
 fi
 
+AC_ARG_ENABLE(usign,
+    AC_HELP_STRING([--enable-usign], [Enable signature checking with usign
+      [[default=yes]] ]),
+    [want_usign="$enableval"], [want_usign="yes"])
+
+if test "x$want_usign" = "xyes"; then
+  AC_DEFINE(HAVE_USIGN, 1, [Define if you want usign support])
+fi
+
 AC_SUBST(GPGME_CFLAGS)
 AC_SUBST(GPGME_LIBS)
 
diff --git a/libopkg/opkg.c b/libopkg/opkg.c
index dbb82fb..dbb904a 100644
--- a/libopkg/opkg.c
+++ b/libopkg/opkg.c
@@ -599,7 +599,7 @@ opkg_update_package_lists(opkg_progress_callback_t progress_callback,
 		}
 		free(url);
 
-#if defined(HAVE_GPGME) || defined(HAVE_OPENSSL)
+#if defined(HAVE_GPGME) || defined(HAVE_OPENSSL) || defined(HAVE_USIGN)
 		if (conf->check_signature) {
 			char *sig_file_name;
 			/* download detached signitures to verify the package lists */
diff --git a/libopkg/opkg_cmd.c b/libopkg/opkg_cmd.c
index d1e91cb..c30e34d 100644
--- a/libopkg/opkg_cmd.c
+++ b/libopkg/opkg_cmd.c
@@ -169,7 +169,7 @@ opkg_update_cmd(int argc, char **argv)
 			    list_file_name);
 	  }
 	  free(url);
-#if defined(HAVE_GPGME) || defined(HAVE_OPENSSL)
+#if defined(HAVE_GPGME) || defined(HAVE_OPENSSL) || defined(HAVE_USIGN)
           if (conf->check_signature) {
               /* download detached signitures to verify the package lists */
               /* get the url for the sig file */
diff --git a/libopkg/opkg_download.c b/libopkg/opkg_download.c
index 4a8b2a2..97e1a84 100644
--- a/libopkg/opkg_download.c
+++ b/libopkg/opkg_download.c
@@ -19,6 +19,7 @@
 
 #include "config.h"
 
+#include <sys/wait.h>
 #include <stdio.h>
 #include <unistd.h>
 #include <libgen.h>
@@ -342,7 +343,28 @@ opkg_prepare_url_for_install(const char *url, char **namep)
 int
 opkg_verify_file (char *text_file, char *sig_file)
 {
-#if defined HAVE_GPGME
+#if defined HAVE_USIGN
+	int status = -1;
+	int pid;
+
+    if (conf->check_signature == 0 )
+        return 0;
+
+	pid = fork();
+	if (pid < 0)
+		return -1;
+
+	if (!pid) {
+		execl("/usr/sbin/opkg-key", "opkg-key", "verify", sig_file, text_file, NULL);
+		exit(255);
+	}
+
+	waitpid(pid, &status, 0);
+	if (!WIFEXITED(status) || WEXITSTATUS(status))
+		return -1;
+
+	return 0;
+#elif defined HAVE_GPGME
     if (conf->check_signature == 0 )
         return 0;
     int status = -1;
diff --git a/libopkg/opkg_install.c b/libopkg/opkg_install.c
index 1b6866c..7e0e17e 100644
--- a/libopkg/opkg_install.c
+++ b/libopkg/opkg_install.c
@@ -1288,7 +1288,7 @@ opkg_install_pkg(pkg_t *pkg, int from_upgrade)
      }
 
      /* check that the repository is valid */
-     #if defined(HAVE_GPGME) || defined(HAVE_OPENSSL)
+     #if defined(HAVE_GPGME) || defined(HAVE_OPENSSL) || defined(HAVE_USIGN)
      char *list_file_name, *sig_file_name, *lists_dir;
 
      /* check to ensure the package has come from a repository */
-- 
2.25.1