333 lines
8.9 KiB
C
333 lines
8.9 KiB
C
/* $NetBSD: k5login.c,v 1.7 1999/07/12 21:36:10 aidan Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 1990 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.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
#ifndef lint
|
|
#if 0
|
|
static char sccsid[] = "@(#)klogin.c 5.11 (Berkeley) 7/12/92";
|
|
#endif
|
|
__RCSID("$NetBSD: k5login.c,v 1.7 1999/07/12 21:36:10 aidan Exp $");
|
|
#endif /* not lint */
|
|
|
|
#ifdef KERBEROS5
|
|
#include <sys/param.h>
|
|
#include <sys/syslog.h>
|
|
#include <krb5.h>
|
|
#include <pwd.h>
|
|
#include <netdb.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
#define KRB5_DEFAULT_OPTIONS 0
|
|
#define KRB5_DEFAULT_LIFE 60*60*10 /* 10 hours */
|
|
|
|
krb5_data tgtname = {
|
|
0,
|
|
KRB5_TGS_NAME_SIZE,
|
|
KRB5_TGS_NAME
|
|
};
|
|
|
|
krb5_context kcontext;
|
|
|
|
extern int notickets;
|
|
extern char *krbtkfile_env;
|
|
extern char *tty;
|
|
|
|
static char tkt_location[MAXPATHLEN];
|
|
static krb5_creds forw_creds;
|
|
int have_forward;
|
|
static krb5_principal me, server;
|
|
|
|
/*
|
|
* Attempt to read forwarded kerberos creds
|
|
*
|
|
* return 0 on success (forwarded creds in memory)
|
|
* 1 if no forwarded creds.
|
|
*/
|
|
int
|
|
k5_read_creds(username)
|
|
char *username;
|
|
{
|
|
krb5_error_code code;
|
|
krb5_creds mcreds;
|
|
krb5_ccache ccache;
|
|
|
|
have_forward = 0;
|
|
memset((char*) &mcreds, 0, sizeof(forw_creds));
|
|
memset((char*) &forw_creds, 0, sizeof(forw_creds));
|
|
|
|
code = krb5_cc_default(kcontext, &ccache);
|
|
if (code) {
|
|
com_err("login", code, "while getting default ccache");
|
|
return(1);
|
|
}
|
|
|
|
code = krb5_parse_name(kcontext, username, &me);
|
|
if (code) {
|
|
com_err("login", code, "when parsing name %s", username);
|
|
return(1);
|
|
}
|
|
|
|
mcreds.client = me;
|
|
code = krb5_build_principal_ext(kcontext, &mcreds.server,
|
|
krb5_princ_realm(kcontext, me)->length,
|
|
krb5_princ_realm(kcontext, me)->data,
|
|
tgtname.length, tgtname.data,
|
|
krb5_princ_realm(kcontext, me)->length,
|
|
krb5_princ_realm(kcontext, me)->data,
|
|
0);
|
|
if (code) {
|
|
com_err("login", code, "while building server name");
|
|
goto nuke_ccache;
|
|
}
|
|
|
|
code = krb5_cc_retrieve_cred(kcontext, ccache, 0,
|
|
&mcreds, &forw_creds);
|
|
if (code) {
|
|
com_err("login", code, "while retrieving V5 initial ticket for copy");
|
|
goto nuke_ccache;
|
|
}
|
|
have_forward = 1;
|
|
|
|
strcpy(tkt_location, getenv("KRB5CCNAME"));
|
|
krbtkfile_env = tkt_location;
|
|
notickets = 0;
|
|
|
|
nuke_ccache:
|
|
krb5_cc_destroy(kcontext, ccache);
|
|
return(!have_forward);
|
|
}
|
|
|
|
int
|
|
k5_write_creds()
|
|
{
|
|
krb5_error_code code;
|
|
krb5_ccache ccache;
|
|
char buf[256];
|
|
|
|
if (!have_forward)
|
|
return(1);
|
|
code = krb5_cc_default(kcontext, &ccache);
|
|
if (code) {
|
|
com_err("login", code, "while getting default ccache");
|
|
return(1);
|
|
}
|
|
|
|
code = krb5_cc_initialize(kcontext, ccache, me);
|
|
if (code) {
|
|
com_err("login", code, "while re-initializing V5 ccache as user");
|
|
goto nuke_ccache_contents;
|
|
}
|
|
|
|
code = krb5_cc_store_cred(kcontext, ccache, &forw_creds);
|
|
if (code) {
|
|
com_err("login", code, "while re-storing V5 ccache as user");
|
|
goto nuke_ccache_contents;
|
|
}
|
|
|
|
nuke_ccache_contents:
|
|
krb5_free_cred_contents(kcontext, &forw_creds);
|
|
return(code != 0);
|
|
}
|
|
|
|
/*
|
|
* 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(pw, instance, localhost, password)
|
|
struct passwd *pw;
|
|
char *instance, *localhost, *password;
|
|
{
|
|
krb5_error_code kerror;
|
|
krb5_address **my_addresses;
|
|
krb5_creds my_creds;
|
|
krb5_timestamp now;
|
|
krb5_ccache ccache = NULL;
|
|
int preauth_type = -1;
|
|
long lifetime = KRB5_DEFAULT_LIFE;
|
|
int options = KRB5_DEFAULT_OPTIONS;
|
|
int i;
|
|
char *realm, *client_name;
|
|
char *principal;
|
|
|
|
/*
|
|
* 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 ||
|
|
krb5_get_default_realm(kcontext, &realm))
|
|
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)snprintf(tkt_location, sizeof tkt_location,
|
|
"FILE:/tmp/krb5cc_%d.%s", pw->pw_uid, tty);
|
|
else
|
|
(void)snprintf(tkt_location, sizeof tkt_location,
|
|
"FILE:/tmp/krb5cc_root_%d.%s", pw->pw_uid, tty);
|
|
krbtkfile_env = tkt_location;
|
|
|
|
principal = (char *)malloc(strlen(pw->pw_name)+strlen(instance)+2);
|
|
strcpy(principal, pw->pw_name); /* XXX strcpy is safe */
|
|
if (strlen(instance)) {
|
|
strcat(principal, "/"); /* XXX strcat is safe */
|
|
strcat(principal, instance); /* XXX strcat is safe */
|
|
}
|
|
|
|
if (kerror = krb5_cc_resolve(kcontext, tkt_location, &ccache)) {
|
|
syslog(LOG_NOTICE, "warning: %s while getting default ccache",
|
|
error_message(kerror));
|
|
return(1);
|
|
}
|
|
|
|
if (kerror = krb5_parse_name(kcontext, principal, &me)) {
|
|
syslog(LOG_NOTICE, "warning: %s when parsing name %s",
|
|
error_message(kerror), principal);
|
|
return(1);
|
|
}
|
|
|
|
if (kerror = krb5_unparse_name(kcontext, me, &client_name)) {
|
|
syslog(LOG_NOTICE, "warning: %s when unparsing name %s",
|
|
error_message(kerror), principal);
|
|
return(1);
|
|
}
|
|
|
|
kerror = krb5_cc_initialize(kcontext, ccache, me);
|
|
if (kerror != 0) {
|
|
syslog(LOG_NOTICE, "%s when initializing cache %s",
|
|
error_message(kerror), tkt_location);
|
|
return(1);
|
|
}
|
|
|
|
memset((char *)&my_creds, 0, sizeof(my_creds));
|
|
|
|
my_creds.client = me;
|
|
|
|
if (kerror = krb5_build_principal_ext(kcontext,
|
|
&server,
|
|
krb5_princ_realm(kcontext, me)->length,
|
|
krb5_princ_realm(kcontext, me)->data,
|
|
tgtname.length, tgtname.data,
|
|
krb5_princ_realm(kcontext, me)->length,
|
|
krb5_princ_realm(kcontext, me)->data,
|
|
0)) {
|
|
syslog(LOG_NOTICE, "%s while building server name",
|
|
error_message(kerror));
|
|
return(1);
|
|
}
|
|
|
|
my_creds.server = server;
|
|
|
|
kerror = krb5_os_localaddr(kcontext, &my_addresses);
|
|
if (kerror != 0) {
|
|
syslog(LOG_NOTICE, "%s when getting my address",
|
|
error_message(kerror));
|
|
return(1);
|
|
}
|
|
|
|
if (kerror = krb5_timeofday(kcontext, &now)) {
|
|
syslog(LOG_NOTICE, "%s while getting time of day",
|
|
error_message(kerror));
|
|
return(1);
|
|
}
|
|
my_creds.times.starttime = 0; /* start timer when request
|
|
gets to KDC */
|
|
my_creds.times.endtime = now + lifetime;
|
|
my_creds.times.renew_till = 0;
|
|
|
|
kerror = krb5_get_in_tkt_with_password(kcontext, options,
|
|
my_addresses,
|
|
NULL,
|
|
NULL,
|
|
password,
|
|
ccache,
|
|
&my_creds, 0);
|
|
|
|
krb5_free_principal(kcontext, server);
|
|
krb5_free_addresses(kcontext, my_addresses);
|
|
|
|
if (chown(&tkt_location[5], pw->pw_uid, pw->pw_gid) < 0)
|
|
syslog(LOG_ERR, "chown tkfile (%s): %m", &tkt_location[5]);
|
|
|
|
if (kerror) {
|
|
if (kerror == KRB5KRB_AP_ERR_BAD_INTEGRITY)
|
|
printf("%s: Kerberos Password incorrect\n", principal);
|
|
else
|
|
printf("%s while getting initial credentials\n", error_message(kerror));
|
|
|
|
return(1);
|
|
}
|
|
|
|
/* Success */
|
|
notickets = 0;
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* Remove any credentials
|
|
*/
|
|
void
|
|
kdestroy()
|
|
{
|
|
krb5_error_code code;
|
|
krb5_ccache ccache = NULL;
|
|
|
|
if (krbtkfile_env == NULL)
|
|
return;
|
|
|
|
code = krb5_cc_resolve(kcontext, krbtkfile_env, &ccache);
|
|
if (!code) {
|
|
code = krb5_cc_destroy(kcontext, ccache);
|
|
if (!code) {
|
|
krb5_cc_close(kcontext, ccache);
|
|
}
|
|
}
|
|
}
|
|
#endif
|