refactor and add su

1 files changed, 24 insertions, 0 deletions

diff --git a/lib/identity.c b/lib/identity.c
new file mode 100644
index 0000000..58dcf52
--- /dev/null
+++ b/lib/identity.c
@@ -0,0 +1,24 @@
+#include "lslib.h"
+
+#include <grp.h>
+#include <pwd.h>
+#include <unistd.h>
+#include <errno.h>
+
+void change_identity(const struct passwd* pw) {
+	int res;
+
+	res = initgroups(pw->pw_name, pw->pw_gid);
+	endgrent();
+
+	if (res != 0) {
+		if (errno == ENOSYS && pw->pw_uid == getuid()) {
+			return;
+		}
+
+		error("can't set groups");
+	}
+
+	xsetgid(pw->pw_gid);
+	xsetuid(pw->pw_uid);
+}