333 lines
9.1 KiB
C
333 lines
9.1 KiB
C
/* $NetBSD: k5login.c,v 1.12 2000/05/30 06:56:16 aidan Exp $ */
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/*-
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)klogin.c 5.11 (Berkeley) 7/12/92";
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#endif
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__RCSID("$NetBSD: k5login.c,v 1.12 2000/05/30 06:56:16 aidan Exp $");
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#endif /* not lint */
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#ifdef KERBEROS5
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#include <sys/param.h>
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#include <sys/syslog.h>
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#include <krb5/krb5.h>
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#include <com_err.h>
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#include <pwd.h>
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#include <netdb.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#define KRB5_DEFAULT_OPTIONS 0
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#define KRB5_DEFAULT_LIFE 60*60*10 /* 10 hours */
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krb5_context kcontext;
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int notickets;
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char *krb5tkfile_env;
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extern char *tty;
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extern int login_krb5_forwardable_tgt;
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extern int has_ccache;
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static char tkt_location[MAXPATHLEN];
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static krb5_creds forw_creds;
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int have_forward;
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static krb5_principal me, server;
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int k5_read_creds __P((char *));
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int k5_write_creds __P((void));
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int k5login __P((struct passwd *, char *, char *, char *));
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void k5destroy __P((void));
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#ifndef krb5_realm_length
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#define krb5_realm_length(r) ((r).length)
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#endif
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#ifndef krb5_realm_data
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#define krb5_realm_data(r) ((r).data)
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#endif
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/*
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* Attempt to read forwarded kerberos creds
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*
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* return 0 on success (forwarded creds in memory)
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* 1 if no forwarded creds.
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*/
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int
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k5_read_creds(username)
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char *username;
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{
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krb5_error_code code;
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krb5_creds mcreds;
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krb5_ccache ccache;
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have_forward = 0;
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memset((char*) &mcreds, 0, sizeof(forw_creds));
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memset((char*) &forw_creds, 0, sizeof(forw_creds));
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code = krb5_cc_default(kcontext, &ccache);
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if (code) {
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com_err("login", code, "while getting default ccache");
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return(1);
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}
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code = krb5_parse_name(kcontext, username, &me);
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if (code) {
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com_err("login", code, "when parsing name %s", username);
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return(1);
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}
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mcreds.client = me;
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code = krb5_build_principal_ext(kcontext, &mcreds.server,
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krb5_realm_length(*krb5_princ_realm(kcontext, me)),
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krb5_realm_data(*krb5_princ_realm(kcontext, me)),
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KRB5_TGS_NAME_SIZE,
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KRB5_TGS_NAME,
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krb5_realm_length(*krb5_princ_realm(kcontext, me)),
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krb5_realm_data(*krb5_princ_realm(kcontext, me)),
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0);
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if (code) {
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com_err("login", code, "while building server name");
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goto nuke_ccache;
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}
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code = krb5_cc_retrieve_cred(kcontext, ccache, 0,
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&mcreds, &forw_creds);
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if (code) {
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com_err("login", code, "while retrieving V5 initial ticket for copy");
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goto nuke_ccache;
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}
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have_forward = 1;
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strcpy(tkt_location, getenv("KRB5CCNAME"));
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krb5tkfile_env = tkt_location;
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has_ccache = 1;
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notickets = 0;
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nuke_ccache:
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krb5_cc_destroy(kcontext, ccache);
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return(!have_forward);
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}
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int
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k5_write_creds()
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{
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krb5_error_code code;
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krb5_ccache ccache;
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if (!have_forward)
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return(1);
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code = krb5_cc_default(kcontext, &ccache);
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if (code) {
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com_err("login", code, "while getting default ccache");
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return(1);
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}
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code = krb5_cc_initialize(kcontext, ccache, me);
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if (code) {
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com_err("login", code, "while re-initializing V5 ccache as user");
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goto nuke_ccache_contents;
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}
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code = krb5_cc_store_cred(kcontext, ccache, &forw_creds);
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if (code) {
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com_err("login", code, "while re-storing V5 ccache as user");
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goto nuke_ccache_contents;
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}
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nuke_ccache_contents:
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krb5_free_cred_contents(kcontext, &forw_creds);
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return(code != 0);
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}
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/*
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* Attempt to log the user in using Kerberos authentication
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*
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* return 0 on success (will be logged in)
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* 1 if Kerberos failed (try local password in login)
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*/
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int
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k5login(pw, instance, localhost, password)
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struct passwd *pw;
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char *instance, *localhost, *password;
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{
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krb5_error_code kerror;
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krb5_creds my_creds;
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krb5_timestamp now;
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krb5_ccache ccache = NULL;
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long lifetime = KRB5_DEFAULT_LIFE;
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int options = KRB5_DEFAULT_OPTIONS;
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char *realm, *client_name;
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char *principal;
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if (login_krb5_forwardable_tgt)
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options |= KDC_OPT_FORWARDABLE;
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/*
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* Root logins don't use Kerberos.
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* If we have a realm, try getting a ticket-granting ticket
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* and using it to authenticate. Otherwise, return
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* failure so that we can try the normal passwd file
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* for a password. If that's ok, log the user in
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* without issuing any tickets.
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*/
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if (strcmp(pw->pw_name, "root") == 0 ||
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krb5_get_default_realm(kcontext, &realm))
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return (1);
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/*
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* get TGT for local realm
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* tickets are stored in a file named TKT_ROOT plus uid
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* except for user.root tickets.
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*/
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if (strcmp(instance, "root") != 0)
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(void)snprintf(tkt_location, sizeof tkt_location,
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"FILE:/tmp/krb5cc_%d.%s", pw->pw_uid, tty);
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else
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(void)snprintf(tkt_location, sizeof tkt_location,
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"FILE:/tmp/krb5cc_root_%d.%s", pw->pw_uid, tty);
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krb5tkfile_env = tkt_location;
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has_ccache = 1;
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principal = (char *)malloc(strlen(pw->pw_name)+strlen(instance)+2);
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strcpy(principal, pw->pw_name); /* XXX strcpy is safe */
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if (strlen(instance)) {
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strcat(principal, "/"); /* XXX strcat is safe */
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strcat(principal, instance); /* XXX strcat is safe */
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}
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if ((kerror = krb5_cc_resolve(kcontext, tkt_location, &ccache)) != 0) {
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syslog(LOG_NOTICE, "warning: %s while getting default ccache",
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error_message(kerror));
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return(1);
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}
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if ((kerror = krb5_parse_name(kcontext, principal, &me)) != 0) {
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syslog(LOG_NOTICE, "warning: %s when parsing name %s",
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error_message(kerror), principal);
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return(1);
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}
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if ((kerror = krb5_unparse_name(kcontext, me, &client_name)) != 0) {
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syslog(LOG_NOTICE, "warning: %s when unparsing name %s",
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error_message(kerror), principal);
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return(1);
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}
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kerror = krb5_cc_initialize(kcontext, ccache, me);
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if (kerror != 0) {
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syslog(LOG_NOTICE, "%s when initializing cache %s",
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error_message(kerror), tkt_location);
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return(1);
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}
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memset((char *)&my_creds, 0, sizeof(my_creds));
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my_creds.client = me;
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if ((kerror = krb5_build_principal_ext(kcontext,
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&server,
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krb5_realm_length(*krb5_princ_realm(kcontext, me)),
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krb5_realm_data(*krb5_princ_realm(kcontext, me)),
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KRB5_TGS_NAME_SIZE,
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KRB5_TGS_NAME,
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krb5_realm_length(*krb5_princ_realm(kcontext, me)),
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krb5_realm_data(*krb5_princ_realm(kcontext, me)),
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0)) != 0) {
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syslog(LOG_NOTICE, "%s while building server name",
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error_message(kerror));
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return(1);
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}
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my_creds.server = server;
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if ((kerror = krb5_timeofday(kcontext, &now)) != 0) {
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syslog(LOG_NOTICE, "%s while getting time of day",
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error_message(kerror));
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return(1);
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}
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my_creds.times.starttime = 0; /* start timer when request
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gets to KDC */
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my_creds.times.endtime = now + lifetime;
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my_creds.times.renew_till = 0;
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kerror = krb5_get_in_tkt_with_password(kcontext, options,
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NULL,
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NULL,
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NULL,
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password,
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ccache,
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&my_creds, 0);
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krb5_free_principal(kcontext, server);
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if (chown(&tkt_location[5], pw->pw_uid, pw->pw_gid) < 0)
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syslog(LOG_ERR, "chown tkfile (%s): %m", &tkt_location[5]);
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if (kerror) {
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if (kerror == KRB5KRB_AP_ERR_BAD_INTEGRITY)
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printf("%s: Kerberos Password incorrect\n", principal);
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else
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printf("%s while getting initial credentials\n", error_message(kerror));
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return(1);
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}
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/* Success */
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notickets = 0;
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return(0);
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}
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/*
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* Remove any credentials
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*/
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void
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k5destroy()
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{
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krb5_error_code code;
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krb5_ccache ccache = NULL;
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if (krb5tkfile_env == NULL)
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return;
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code = krb5_cc_resolve(kcontext, krb5tkfile_env, &ccache);
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if (!code)
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code = krb5_cc_destroy(kcontext, ccache);
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}
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#endif
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