1 files changed, 207 insertions, 0 deletions
diff --git a/system_cmds/login.tproj/klogin.c b/system_cmds/login.tproj/klogin.c
new file mode 100644
index 0000000..b9f0927
--- /dev/null
+++ b/system_cmds/login.tproj/klogin.c
@@ -0,0 +1,207 @@
+/*
+ * Copyright (c) 1999-2016 Apple Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ *
+ * "Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
+ * Reserved.  This file contains Original Code and/or Modifications of
+ * Original Code as defined in and that are subject to the Apple Public
+ * Source License Version 1.0 (the 'License').  You may not use this file
+ * except in compliance with the License.  Please obtain a copy of the
+ * License at http://www.apple.com/publicsource and read it before using
+ * this file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
+ * License for the specific language governing rights and limitations
+ * under the License."
+ *
+ * @APPLE_LICENSE_HEADER_END@
+ */
+/*-
+ * Copyright (c) 1990, 1993, 1994
+ *      The Regents of the University of California.  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. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *      This product includes software developed by the University of
+ *      California, Berkeley and its contributors.
+ * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
+ */
+
+#ifdef KERBEROS
+#include <sys/param.h>
+#include <sys/syslog.h>
+#include <kerberosIV/des.h>
+#include <kerberosIV/krb.h>
+
+#include <err.h>
+#include <netdb.h>
+#include <pwd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#define	INITIAL_TICKET	"krbtgt"
+#define	VERIFY_SERVICE	"rcmd"
+
+extern int notickets;
+extern char *krbtkfile_env;
+
+/*
+ * Attempt to log the user in using Kerberos authentication
+ *
+ * return 0 on success (will be logged in)
+ *	  1 if Kerberos failed (try local password in login)
+ */
+int
+klogin(struct passwd *pw, char *instance, char *localhost, char *password)
+{
+	int kerror;
+	AUTH_DAT authdata;
+	KTEXT_ST ticket;
+	struct hostent *hp;
+	unsigned long faddr;
+	char realm[REALM_SZ], savehost[MAXHOSTNAMELEN];
+	char tkt_location[MAXPATHLEN];
+	char *krb_get_phost();
+
+	/*
+	 * Root logins don't use Kerberos.
+	 * If we have a realm, try getting a ticket-granting ticket
+	 * and using it to authenticate.  Otherwise, return
+	 * failure so that we can try the normal passwd file
+	 * for a password.  If that's ok, log the user in
+	 * without issuing any tickets.
+	 */
+	if (strcmp(pw->pw_name, "root") == 0 ||
+	    krb_get_lrealm(realm, 0) != KSUCCESS)
+		return (1);
+
+	/*
+	 * get TGT for local realm
+	 * tickets are stored in a file named TKT_ROOT plus uid
+	 * except for user.root tickets.
+	 */
+
+	if (strcmp(instance, "root") != 0)
+		(void)sprintf(tkt_location, "%s%d", TKT_ROOT, pw->pw_uid);
+	else {
+		(void)sprintf(tkt_location, "%s_root_%d", TKT_ROOT, pw->pw_uid);
+		krbtkfile_env = tkt_location;
+	}
+	(void)krb_set_tkt_string(tkt_location);
+
+	/*
+	 * Set real as well as effective ID to 0 for the moment,
+	 * to make the kerberos library do the right thing.
+	 */
+	if (setuid(0) < 0) {
+		warnx("setuid");
+		return (1);
+	}
+	kerror = krb_get_pw_in_tkt(pw->pw_name, instance,
+		    realm, INITIAL_TICKET, realm, DEFAULT_TKT_LIFE, password);
+	/*
+	 * If we got a TGT, get a local "rcmd" ticket and check it so as to
+	 * ensure that we are not talking to a bogus Kerberos server.
+	 *
+	 * There are 2 cases where we still allow a login:
+	 *	1: the VERIFY_SERVICE doesn't exist in the KDC
+	 *	2: local host has no srvtab, as (hopefully) indicated by a
+	 *	   return value of RD_AP_UNDEC from krb_rd_req().
+	 */
+	if (kerror != INTK_OK) {
+		if (kerror != INTK_BADPW && kerror != KDC_PR_UNKNOWN) {
+			syslog(LOG_ERR, "Kerberos intkt error: %s",
+			    krb_err_txt[kerror]);
+			dest_tkt();
+		}
+		return (1);
+	}
+
+	if (chown(TKT_FILE, pw->pw_uid, pw->pw_gid) < 0)
+		syslog(LOG_ERR, "chown tkfile (%s): %m", TKT_FILE);
+
+	(void)strncpy(savehost, krb_get_phost(localhost), sizeof(savehost));
+	savehost[sizeof(savehost)-1] = NULL;
+
+	/*
+	 * if the "VERIFY_SERVICE" doesn't exist in the KDC for this host,
+	 * still allow login with tickets, but log the error condition.
+	 */
+
+	kerror = krb_mk_req(&ticket, VERIFY_SERVICE, savehost, realm, 33);
+	if (kerror == KDC_PR_UNKNOWN) {
+		syslog(LOG_NOTICE,
+		    "warning: TGT not verified (%s); %s.%s not registered, or srvtab is wrong?",
+		    krb_err_txt[kerror], VERIFY_SERVICE, savehost);
+		notickets = 0;
+		return (0);
+	}
+
+	if (kerror != KSUCCESS) {
+		warnx("unable to use TGT: (%s)", krb_err_txt[kerror]);
+		syslog(LOG_NOTICE, "unable to use TGT: (%s)",
+		    krb_err_txt[kerror]);
+		dest_tkt();
+		return (1);
+	}
+
+	if (!(hp = gethostbyname(localhost))) {
+		syslog(LOG_ERR, "couldn't get local host address");
+		dest_tkt();
+		return (1);
+	}
+
+	memmove((void *)&faddr, (void *)hp->h_addr, sizeof(faddr));
+
+	kerror = krb_rd_req(&ticket, VERIFY_SERVICE, savehost, faddr,
+	    &authdata, "");
+
+	if (kerror == KSUCCESS) {
+		notickets = 0;
+		return (0);
+	}
+
+	/* undecipherable: probably didn't have a srvtab on the local host */
+	if (kerror = RD_AP_UNDEC) {
+		syslog(LOG_NOTICE, "krb_rd_req: (%s)\n", krb_err_txt[kerror]);
+		dest_tkt();
+		return (1);
+	}
+	/* failed for some other reason */
+	warnx("unable to verify %s ticket: (%s)", VERIFY_SERVICE,
+	    krb_err_txt[kerror]);
+	syslog(LOG_NOTICE, "couldn't verify %s ticket: %s", VERIFY_SERVICE,
+	    krb_err_txt[kerror]);
+	dest_tkt();
+	return (1);
+}
+#endif