1 files changed, 115 insertions, 0 deletions
diff --git a/source4/heimdal/lib/krb5/get_default_principal.c b/source4/heimdal/lib/krb5/get_default_principal.c
new file mode 100644
index 0000000000..03e8f0a823
--- /dev/null
+++ b/source4/heimdal/lib/krb5/get_default_principal.c
@@ -0,0 +1,115 @@
+/*
+ * Copyright (c) 1997 - 2001 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden). 
+ * All rights reserved. 
+ *
+ * Redistribution and use in source and binary forms, with or without 
+ * modification, are permitted provided that the following conditions 
+ * are met: 
+ *
+ * 1. Redistributions of source code must retain the above copyright 
+ *    notice, this list of conditions and the following disclaimer. 
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright 
+ *    notice, this list of conditions and the following disclaimer in the 
+ *    documentation and/or other materials provided with the distribution. 
+ *
+ * 3. Neither the name of the Institute nor the names of its contributors 
+ *    may be used to endorse or promote products derived from this software 
+ *    without specific prior written permission. 
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND 
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE 
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 
+ * SUCH DAMAGE. 
+ */
+
+#include "krb5_locl.h"
+
+RCSID("$Id: get_default_principal.c,v 1.10 2005/04/20 20:53:29 lha Exp $");
+
+/*
+ * Try to find out what's a reasonable default principal.
+ */
+
+static const char*
+get_env_user(void)
+{
+    const char *user = getenv("USER");
+    if(user == NULL)
+	user = getenv("LOGNAME");
+    if(user == NULL)
+	user = getenv("USERNAME");
+    return user;
+}
+
+/*
+ * Will only use operating-system dependant operation to get the
+ * default principal, for use of functions that in ccache layer to
+ * avoid recursive calls.
+ */
+
+krb5_error_code
+_krb5_get_default_principal_local (krb5_context context, 
+				   krb5_principal *princ)
+{
+    krb5_error_code ret;
+    const char *user;
+    uid_t uid;
+
+    *princ = NULL;
+
+    uid = getuid();    
+    if(uid == 0) {
+	user = getlogin();
+	if(user == NULL)
+	    user = get_env_user();
+	if(user != NULL && strcmp(user, "root") != 0)
+	    ret = krb5_make_principal(context, princ, NULL, user, "root", NULL);
+	else
+	    ret = krb5_make_principal(context, princ, NULL, "root", NULL);
+    } else {
+	struct passwd *pw = getpwuid(uid);	
+	if(pw != NULL)
+	    user = pw->pw_name;
+	else {
+	    user = get_env_user();
+	    if(user == NULL)
+		user = getlogin();
+	}
+	if(user == NULL) {
+	    krb5_set_error_string(context,
+				  "unable to figure out current principal");
+	    return ENOTTY; /* XXX */
+	}
+	ret = krb5_make_principal(context, princ, NULL, user, NULL);
+    }
+    return ret;
+}
+
+krb5_error_code KRB5_LIB_FUNCTION
+krb5_get_default_principal (krb5_context context,
+			    krb5_principal *princ)
+{
+    krb5_error_code ret;
+    krb5_ccache id;
+
+    *princ = NULL;
+
+    ret = krb5_cc_default (context, &id);
+    if (ret == 0) {
+	ret = krb5_cc_get_principal (context, id, princ);
+	krb5_cc_close (context, id);
+	if (ret == 0)
+	    return 0;
+    }
+
+    return _krb5_get_default_principal_local(context, princ);
+}