1 /* $OpenBSD: gss-serv-krb5.c,v 1.1 2003/08/22 10:56:09 markus Exp $ */
4 * Copyright (c) 2001-2003 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.
39 extern ServerOptions options;
44 #include <gssapi_krb5.h>
47 static krb5_context krb_context = NULL;
49 /* Initialise the krb5 library, for the stuff that GSSAPI won't do */
52 ssh_gssapi_krb5_init()
54 krb5_error_code problem;
56 if (krb_context != NULL)
59 problem = krb5_init_context(&krb_context);
61 logit("Cannot initialize krb5 context");
64 krb5_init_ets(krb_context);
69 /* Check if this user is OK to login. This only works with krb5 - other
70 * GSSAPI mechanisms will need their own.
71 * Returns true if the user is OK to log in, otherwise returns 0
75 ssh_gssapi_krb5_userok(ssh_gssapi_client *client, char *name)
80 if (ssh_gssapi_krb5_init() == 0)
83 if ((retval = krb5_parse_name(krb_context, client->exportedname.value,
85 logit("krb5_parse_name(): %.100s",
86 krb5_get_err_text(krb_context, retval));
89 if (krb5_kuserok(krb_context, princ, name)) {
91 logit("Authorized to %s, krb5 principal %s (krb5_kuserok)",
92 name, (char *)client->displayname.value);
96 krb5_free_principal(krb_context, princ);
101 /* This writes out any forwarded credentials from the structure populated
102 * during userauth. Called after we have setuid to the user */
105 ssh_gssapi_krb5_storecreds(ssh_gssapi_client *client)
108 krb5_error_code problem;
109 krb5_principal princ;
110 OM_uint32 maj_status, min_status;
112 if (client->creds == NULL) {
113 debug("No credentials stored");
117 if (ssh_gssapi_krb5_init() == 0)
121 if ((problem = krb5_cc_gen_new(krb_context, &krb5_fcc_ops, &ccache))) {
122 logit("krb5_cc_gen_new(): %.100s",
123 krb5_get_err_text(krb_context, problem));
131 snprintf(ccname, sizeof(ccname),
132 "FILE:/tmp/krb5cc_%d_XXXXXX", geteuid());
134 if ((tmpfd = mkstemp(ccname + strlen("FILE:"))) == -1) {
135 logit("mkstemp(): %.100s", strerror(errno));
139 if (fchmod(tmpfd, S_IRUSR | S_IWUSR) == -1) {
140 logit("fchmod(): %.100s", strerror(errno));
146 if ((problem = krb5_cc_resolve(krb_context, ccname, &ccache))) {
147 logit("krb5_cc_resolve(): %.100s",
148 krb5_get_err_text(krb_context, problem));
152 #endif /* #ifdef HEIMDAL */
154 if ((problem = krb5_parse_name(krb_context,
155 client->exportedname.value, &princ))) {
156 logit("krb5_parse_name(): %.100s",
157 krb5_get_err_text(krb_context, problem));
158 krb5_cc_destroy(krb_context, ccache);
162 if ((problem = krb5_cc_initialize(krb_context, ccache, princ))) {
163 logit("krb5_cc_initialize(): %.100s",
164 krb5_get_err_text(krb_context, problem));
165 krb5_free_principal(krb_context, princ);
166 krb5_cc_destroy(krb_context, ccache);
170 krb5_free_principal(krb_context, princ);
172 if ((maj_status = gss_krb5_copy_ccache(&min_status,
173 client->creds, ccache))) {
174 logit("gss_krb5_copy_ccache() failed");
175 krb5_cc_destroy(krb_context, ccache);
179 client->store.filename = xstrdup(krb5_cc_get_name(krb_context, ccache));
180 client->store.envvar = "KRB5CCNAME";
181 client->store.envval = xstrdup(client->store.filename);
185 do_pam_putenv(client->store.envvar,client->store.envval);
188 krb5_cc_close(krb_context, ccache);
193 ssh_gssapi_mech gssapi_kerberos_mech = {
194 "toWM5Slw5Ew8Mqkay+al2g==",
196 {9, "\x2A\x86\x48\x86\xF7\x12\x01\x02\x02"},
198 &ssh_gssapi_krb5_userok,
200 &ssh_gssapi_krb5_storecreds