1 /* $OpenBSD: gss-serv-krb5.c,v 1.7 2006/08/03 03:34:42 deraadt Exp $ */
4 * Copyright (c) 2001-2007 Simon Wilkinson. All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR `AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 #include <sys/types.h>
47 extern ServerOptions options;
52 # ifdef HAVE_GSSAPI_KRB5_H
53 # include <gssapi_krb5.h>
54 # elif HAVE_GSSAPI_GSSAPI_KRB5_H
55 # include <gssapi/gssapi_krb5.h>
59 static krb5_context krb_context = NULL;
61 /* Initialise the krb5 library, for the stuff that GSSAPI won't do */
64 ssh_gssapi_krb5_init(void)
66 krb5_error_code problem;
68 if (krb_context != NULL)
71 problem = krb5_init_context(&krb_context);
73 logit("Cannot initialize krb5 context");
80 /* Check if this user is OK to login. This only works with krb5 - other
81 * GSSAPI mechanisms will need their own.
82 * Returns true if the user is OK to log in, otherwise returns 0
86 ssh_gssapi_krb5_userok(ssh_gssapi_client *client, char *name)
91 if (ssh_gssapi_krb5_init() == 0)
94 if ((retval = krb5_parse_name(krb_context, client->exportedname.value,
96 logit("krb5_parse_name(): %.100s",
97 krb5_get_err_text(krb_context, retval));
100 if (krb5_kuserok(krb_context, princ, name)) {
102 logit("Authorized to %s, krb5 principal %s (krb5_kuserok)",
103 name, (char *)client->displayname.value);
107 krb5_free_principal(krb_context, princ);
112 /* This writes out any forwarded credentials from the structure populated
113 * during userauth. Called after we have setuid to the user */
116 ssh_gssapi_krb5_storecreds(ssh_gssapi_client *client)
119 krb5_error_code problem;
120 krb5_principal princ;
121 OM_uint32 maj_status, min_status;
123 const char *new_ccname;
125 if (client->creds == NULL) {
126 debug("No credentials stored");
130 if (ssh_gssapi_krb5_init() == 0)
134 if ((problem = krb5_cc_gen_new(krb_context, &krb5_fcc_ops, &ccache))) {
135 logit("krb5_cc_gen_new(): %.100s",
136 krb5_get_err_text(krb_context, problem));
140 if ((problem = ssh_krb5_cc_gen(krb_context, &ccache))) {
141 logit("ssh_krb5_cc_gen(): %.100s",
142 krb5_get_err_text(krb_context, problem));
145 #endif /* #ifdef HEIMDAL */
147 if ((problem = krb5_parse_name(krb_context,
148 client->exportedname.value, &princ))) {
149 logit("krb5_parse_name(): %.100s",
150 krb5_get_err_text(krb_context, problem));
151 krb5_cc_destroy(krb_context, ccache);
155 if ((problem = krb5_cc_initialize(krb_context, ccache, princ))) {
156 logit("krb5_cc_initialize(): %.100s",
157 krb5_get_err_text(krb_context, problem));
158 krb5_free_principal(krb_context, princ);
159 krb5_cc_destroy(krb_context, ccache);
163 krb5_free_principal(krb_context, princ);
165 if ((maj_status = gss_krb5_copy_ccache(&min_status,
166 client->creds, ccache))) {
167 logit("gss_krb5_copy_ccache() failed");
168 krb5_cc_destroy(krb_context, ccache);
172 new_ccname = krb5_cc_get_name(krb_context, ccache);
174 client->store.envvar = "KRB5CCNAME";
176 xasprintf(&client->store.envval, "API:%s", new_ccname);
177 client->store.filename = NULL;
179 xasprintf(&client->store.envval, "FILE:%s", new_ccname);
180 client->store.filename = xstrdup(new_ccname);
185 do_pam_putenv(client->store.envvar, client->store.envval);
188 krb5_cc_close(krb_context, ccache);
194 ssh_gssapi_krb5_updatecreds(ssh_gssapi_ccache *store,
195 ssh_gssapi_client *client)
197 krb5_ccache ccache = NULL;
198 krb5_principal principal = NULL;
200 krb5_error_code problem;
201 OM_uint32 maj_status, min_status;
203 if ((problem = krb5_cc_resolve(krb_context, store->envval, &ccache))) {
204 logit("krb5_cc_resolve(): %.100s",
205 krb5_get_err_text(krb_context, problem));
209 /* Find out who the principal in this cache is */
210 if ((problem = krb5_cc_get_principal(krb_context, ccache,
212 logit("krb5_cc_get_principal(): %.100s",
213 krb5_get_err_text(krb_context, problem));
214 krb5_cc_close(krb_context, ccache);
218 if ((problem = krb5_unparse_name(krb_context, principal, &name))) {
219 logit("krb5_unparse_name(): %.100s",
220 krb5_get_err_text(krb_context, problem));
221 krb5_free_principal(krb_context, principal);
222 krb5_cc_close(krb_context, ccache);
227 if (strcmp(name,client->exportedname.value)!=0) {
228 debug("Name in local credentials cache differs. Not storing");
229 krb5_free_principal(krb_context, principal);
230 krb5_cc_close(krb_context, ccache);
231 krb5_free_unparsed_name(krb_context, name);
234 krb5_free_unparsed_name(krb_context, name);
236 /* Name matches, so lets get on with it! */
238 if ((problem = krb5_cc_initialize(krb_context, ccache, principal))) {
239 logit("krb5_cc_initialize(): %.100s",
240 krb5_get_err_text(krb_context, problem));
241 krb5_free_principal(krb_context, principal);
242 krb5_cc_close(krb_context, ccache);
246 krb5_free_principal(krb_context, principal);
248 if ((maj_status = gss_krb5_copy_ccache(&min_status, client->creds,
250 logit("gss_krb5_copy_ccache() failed. Sorry!");
251 krb5_cc_close(krb_context, ccache);
258 ssh_gssapi_mech gssapi_kerberos_mech = {
259 "toWM5Slw5Ew8Mqkay+al2g==",
261 {9, "\x2A\x86\x48\x86\xF7\x12\x01\x02\x02"},
263 &ssh_gssapi_krb5_userok,
265 &ssh_gssapi_krb5_storecreds,
266 &ssh_gssapi_krb5_updatecreds