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/* $OpenBSD: auth-krb5.c,v 1.23 2018/07/09 21:35:50 markus Exp $ */
/*
* Kerberos v5 authentication and ticket-passing routines.
*
* From: FreeBSD: src/crypto/openssh/auth-krb5.c,v 1.6 2001/02/13 16:58:04 assar
*/
/*
* Copyright (c) 2002 Daniel Kouril. 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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/types.h>
#include <pwd.h>
#include <stdarg.h>
#include "xmalloc.h"
#include "ssh.h"
#include "packet.h"
#include "log.h"
#include "sshbuf.h"
#include "sshkey.h"
#include "servconf.h"
#include "uidswap.h"
#include "hostfile.h"
#include "auth.h"
#ifdef KRB5
#include <krb5.h>
extern ServerOptions options;
static int
krb5_init(void *context)
{
Authctxt *authctxt = (Authctxt *)context;
krb5_error_code problem;
if (authctxt->krb5_ctx == NULL) {
problem = krb5_init_context(&authctxt->krb5_ctx);
if (problem)
return (problem);
krb5_init_ets(authctxt->krb5_ctx);
}
return (0);
}
int
auth_krb5_password(Authctxt *authctxt, const char *password)
{
krb5_error_code problem;
krb5_ccache ccache = NULL;
const char *errmsg;
temporarily_use_uid(authctxt->pw);
problem = krb5_init(authctxt);
if (problem)
goto out;
problem = krb5_parse_name(authctxt->krb5_ctx, authctxt->pw->pw_name,
&authctxt->krb5_user);
if (problem)
goto out;
problem = krb5_cc_new_unique(authctxt->krb5_ctx,
krb5_mcc_ops.prefix, NULL, &ccache);
if (problem)
goto out;
problem = krb5_cc_initialize(authctxt->krb5_ctx, ccache,
authctxt->krb5_user);
if (problem)
goto out;
restore_uid();
problem = krb5_verify_user(authctxt->krb5_ctx, authctxt->krb5_user,
ccache, password, 1, NULL);
temporarily_use_uid(authctxt->pw);
if (problem)
goto out;
problem = krb5_cc_new_unique(authctxt->krb5_ctx,
krb5_fcc_ops.prefix, NULL, &authctxt->krb5_fwd_ccache);
if (problem)
goto out;
problem = krb5_cc_copy_cache(authctxt->krb5_ctx, ccache,
authctxt->krb5_fwd_ccache);
krb5_cc_destroy(authctxt->krb5_ctx, ccache);
ccache = NULL;
if (problem)
goto out;
authctxt->krb5_ticket_file = (char *)krb5_cc_get_name(authctxt->krb5_ctx,
authctxt->krb5_fwd_ccache);
out:
restore_uid();
if (problem) {
if (ccache)
krb5_cc_destroy(authctxt->krb5_ctx, ccache);
if (authctxt->krb5_ctx != NULL) {
errmsg = krb5_get_error_message(authctxt->krb5_ctx,
problem);
debug("Kerberos password authentication failed: %s",
errmsg);
krb5_free_error_message(authctxt->krb5_ctx, errmsg);
} else
debug("Kerberos password authentication failed: %d",
problem);
krb5_cleanup_proc(authctxt);
if (options.kerberos_or_local_passwd)
return (-1);
else
return (0);
}
return (authctxt->valid ? 1 : 0);
}
void
krb5_cleanup_proc(Authctxt *authctxt)
{
debug("krb5_cleanup_proc called");
if (authctxt->krb5_fwd_ccache) {
krb5_cc_destroy(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache);
authctxt->krb5_fwd_ccache = NULL;
}
if (authctxt->krb5_user) {
krb5_free_principal(authctxt->krb5_ctx, authctxt->krb5_user);
authctxt->krb5_user = NULL;
}
if (authctxt->krb5_ctx) {
krb5_free_context(authctxt->krb5_ctx);
authctxt->krb5_ctx = NULL;
}
}
#endif /* KRB5 */
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