1 files changed, 39 insertions, 0 deletions
diff --git a/imap/externalauth.c b/imap/externalauth.c
new file mode 100644
index 0000000..154e876
--- /dev/null
+++ b/imap/externalauth.c
@@ -0,0 +1,39 @@
+/*
+** Copyright 1998 - 2008 Double Precision, Inc.
+** See COPYING for distribution information.
+*/
+
+#if	HAVE_CONFIG_H
+#include	"config.h"
+#endif
+#include	<stdio.h>
+#include	<stdlib.h>
+#include	<string.h>
+#if	HAVE_UNISTD_H
+#include	<unistd.h>
+#endif
+
+const char *externalauth()
+{
+	const char *p=getenv("TLS_EXTERNAL");
+	char *q, *r;
+
+	if (!p || !*p)
+		return NULL;
+
+	if ((q=malloc(strlen(p)+20)) == NULL)
+		return NULL;
+
+	strcat(strcpy(q, "TLS_SUBJECT_"), p);
+
+	for (r=q; *r; r++)
+		if (*r >= 'a' && *r <= 'z')
+			*r -= 'a' - 'A';
+
+	p=getenv(q);
+	free(q);
+
+	if (p && *p)
+		return p;
+	return 0;
+}