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450bc1180d
in servconf.h.
213 lines
5.6 KiB
C
213 lines
5.6 KiB
C
/* $OpenBSD: gss-serv-krb5.c,v 1.8 2013/07/20 01:55:13 djm Exp $ */
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/*
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* Copyright (c) 2001-2003 Simon Wilkinson. 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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR `AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "includes.h"
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#ifdef GSSAPI
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#ifdef KRB5
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#include <sys/types.h>
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#include <stdarg.h>
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#include <string.h>
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#include "xmalloc.h"
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#include "key.h"
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#include "hostfile.h"
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#include "auth.h"
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#include "log.h"
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#include "misc.h"
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#include "servconf.h"
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#include "buffer.h"
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#include "ssh-gss.h"
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extern ServerOptions options;
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#ifdef HEIMDAL
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# include <krb5.h>
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#endif
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#ifdef HAVE_GSSAPI_KRB5_H
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# include <gssapi_krb5.h>
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#elif HAVE_GSSAPI_GSSAPI_KRB5_H
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# include <gssapi/gssapi_krb5.h>
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#endif
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static krb5_context krb_context = NULL;
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/* Initialise the krb5 library, for the stuff that GSSAPI won't do */
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static int
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ssh_gssapi_krb5_init(void)
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{
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krb5_error_code problem;
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if (krb_context != NULL)
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return 1;
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problem = krb5_init_context(&krb_context);
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if (problem) {
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logit("Cannot initialize krb5 context");
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return 0;
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}
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return 1;
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}
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/* Check if this user is OK to login. This only works with krb5 - other
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* GSSAPI mechanisms will need their own.
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* Returns true if the user is OK to log in, otherwise returns 0
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*/
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static int
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ssh_gssapi_krb5_userok(ssh_gssapi_client *client, char *name)
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{
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krb5_principal princ;
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int retval;
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const char *errmsg;
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if (ssh_gssapi_krb5_init() == 0)
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return 0;
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if ((retval = krb5_parse_name(krb_context, client->exportedname.value,
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&princ))) {
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errmsg = krb5_get_error_message(krb_context, retval);
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logit("krb5_parse_name(): %.100s", errmsg);
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krb5_free_error_message(krb_context, errmsg);
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return 0;
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}
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if (krb5_kuserok(krb_context, princ, name)) {
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retval = 1;
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logit("Authorized to %s, krb5 principal %s (krb5_kuserok)",
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name, (char *)client->displayname.value);
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} else
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retval = 0;
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krb5_free_principal(krb_context, princ);
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return retval;
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}
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/* This writes out any forwarded credentials from the structure populated
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* during userauth. Called after we have setuid to the user */
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static void
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ssh_gssapi_krb5_storecreds(ssh_gssapi_client *client)
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{
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krb5_ccache ccache;
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krb5_error_code problem;
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krb5_principal princ;
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OM_uint32 maj_status, min_status;
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int len;
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const char *errmsg;
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if (client->creds == NULL) {
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debug("No credentials stored");
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return;
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}
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if (ssh_gssapi_krb5_init() == 0)
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return;
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#ifdef HEIMDAL
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# ifdef HAVE_KRB5_CC_NEW_UNIQUE
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if ((problem = krb5_cc_new_unique(krb_context, krb5_fcc_ops.prefix,
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NULL, &ccache)) != 0) {
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errmsg = krb5_get_error_message(krb_context, problem);
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logit("krb5_cc_new_unique(): %.100s", errmsg);
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# else
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if ((problem = krb5_cc_gen_new(krb_context, &krb5_fcc_ops, &ccache))) {
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logit("krb5_cc_gen_new(): %.100s",
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krb5_get_err_text(krb_context, problem));
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# endif
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krb5_free_error_message(krb_context, errmsg);
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return;
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}
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#else
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if ((problem = ssh_krb5_cc_gen(krb_context, &ccache))) {
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errmsg = krb5_get_error_message(krb_context, problem);
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logit("ssh_krb5_cc_gen(): %.100s", errmsg);
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krb5_free_error_message(krb_context, errmsg);
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return;
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}
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#endif /* #ifdef HEIMDAL */
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if ((problem = krb5_parse_name(krb_context,
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client->exportedname.value, &princ))) {
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errmsg = krb5_get_error_message(krb_context, problem);
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logit("krb5_parse_name(): %.100s", errmsg);
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krb5_free_error_message(krb_context, errmsg);
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return;
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}
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if ((problem = krb5_cc_initialize(krb_context, ccache, princ))) {
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errmsg = krb5_get_error_message(krb_context, problem);
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logit("krb5_cc_initialize(): %.100s", errmsg);
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krb5_free_error_message(krb_context, errmsg);
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krb5_free_principal(krb_context, princ);
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krb5_cc_destroy(krb_context, ccache);
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return;
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}
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krb5_free_principal(krb_context, princ);
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if ((maj_status = gss_krb5_copy_ccache(&min_status,
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client->creds, ccache))) {
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logit("gss_krb5_copy_ccache() failed");
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krb5_cc_destroy(krb_context, ccache);
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return;
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}
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client->store.filename = xstrdup(krb5_cc_get_name(krb_context, ccache));
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client->store.envvar = "KRB5CCNAME";
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len = strlen(client->store.filename) + 6;
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client->store.envval = xmalloc(len);
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snprintf(client->store.envval, len, "FILE:%s", client->store.filename);
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#ifdef USE_PAM
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if (options.use_pam)
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do_pam_putenv(client->store.envvar, client->store.envval);
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#endif
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krb5_cc_close(krb_context, ccache);
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return;
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}
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ssh_gssapi_mech gssapi_kerberos_mech = {
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"toWM5Slw5Ew8Mqkay+al2g==",
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"Kerberos",
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{9, "\x2A\x86\x48\x86\xF7\x12\x01\x02\x02"},
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NULL,
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&ssh_gssapi_krb5_userok,
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NULL,
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&ssh_gssapi_krb5_storecreds
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};
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#endif /* KRB5 */
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#endif /* GSSAPI */
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