blob: 0aa5195b892f0a59cd92bd63990d3c868045272f [file] [log] [blame]
Damien Miller964fed52001-09-25 12:58:23 +10001/*
2 * Kerberos v5 authentication and ticket-passing routines.
Ben Lindstrom6328ab32002-03-22 02:54:23 +00003 *
Damien Miller964fed52001-09-25 12:58:23 +10004 * $FreeBSD: src/crypto/openssh/auth-krb5.c,v 1.6 2001/02/13 16:58:04 assar Exp $
Damien Miller964fed52001-09-25 12:58:23 +10005 */
Ben Lindstromeacc71b2002-03-22 01:22:27 +00006/*
7 * Copyright (c) 2002 Daniel Kouril. All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
Damien Miller964fed52001-09-25 12:58:23 +100029
30#include "includes.h"
Damien Miller1a0c0b92003-09-02 22:51:17 +100031RCSID("$OpenBSD: auth-krb5.c,v 1.12 2003/08/28 12:54:34 markus Exp $");
Ben Lindstrom05764b92002-03-05 01:53:02 +000032
Damien Miller964fed52001-09-25 12:58:23 +100033#include "ssh.h"
34#include "ssh1.h"
35#include "packet.h"
36#include "xmalloc.h"
37#include "log.h"
38#include "servconf.h"
39#include "uidswap.h"
40#include "auth.h"
41
42#ifdef KRB5
Damien Miller9c617692003-05-14 14:31:11 +100043
Damien Miller964fed52001-09-25 12:58:23 +100044#include <krb5.h>
45
46extern ServerOptions options;
47
48static int
49krb5_init(void *context)
50{
51 Authctxt *authctxt = (Authctxt *)context;
52 krb5_error_code problem;
53 static int cleanup_registered = 0;
Damien Millerdb95e4e2002-02-13 16:56:44 +110054
Damien Miller964fed52001-09-25 12:58:23 +100055 if (authctxt->krb5_ctx == NULL) {
56 problem = krb5_init_context(&authctxt->krb5_ctx);
57 if (problem)
58 return (problem);
59 krb5_init_ets(authctxt->krb5_ctx);
60 }
61 if (!cleanup_registered) {
62 fatal_add_cleanup(krb5_cleanup_proc, authctxt);
63 cleanup_registered = 1;
64 }
65 return (0);
66}
67
Damien Miller964fed52001-09-25 12:58:23 +100068int
69auth_krb5_password(Authctxt *authctxt, const char *password)
70{
Damien Millerfd4c9ee2002-04-13 11:04:40 +100071#ifndef HEIMDAL
72 krb5_creds creds;
73 krb5_principal server;
74 char ccname[40];
75 int tmpfd;
76#endif
Damien Miller964fed52001-09-25 12:58:23 +100077 krb5_error_code problem;
Darren Tuckerec0943a2003-08-11 22:55:36 +100078 krb5_ccache ccache = NULL;
Damien Millerdb95e4e2002-02-13 16:56:44 +110079
Damien Miller964fed52001-09-25 12:58:23 +100080 if (authctxt->pw == NULL)
81 return (0);
Damien Millerdb95e4e2002-02-13 16:56:44 +110082
Damien Miller964fed52001-09-25 12:58:23 +100083 temporarily_use_uid(authctxt->pw);
Damien Millerdb95e4e2002-02-13 16:56:44 +110084
Damien Miller964fed52001-09-25 12:58:23 +100085 problem = krb5_init(authctxt);
86 if (problem)
87 goto out;
Damien Millerdb95e4e2002-02-13 16:56:44 +110088
Damien Miller964fed52001-09-25 12:58:23 +100089 problem = krb5_parse_name(authctxt->krb5_ctx, authctxt->pw->pw_name,
90 &authctxt->krb5_user);
91 if (problem)
92 goto out;
Damien Millerdb95e4e2002-02-13 16:56:44 +110093
Damien Millerfd4c9ee2002-04-13 11:04:40 +100094#ifdef HEIMDAL
Darren Tuckerec0943a2003-08-11 22:55:36 +100095 problem = krb5_cc_gen_new(authctxt->krb5_ctx, &krb5_mcc_ops, &ccache);
Damien Miller964fed52001-09-25 12:58:23 +100096 if (problem)
97 goto out;
Damien Millerdb95e4e2002-02-13 16:56:44 +110098
Darren Tuckerec0943a2003-08-11 22:55:36 +100099 problem = krb5_cc_initialize(authctxt->krb5_ctx, ccache,
100 authctxt->krb5_user);
Damien Miller964fed52001-09-25 12:58:23 +1000101 if (problem)
102 goto out;
Damien Millerdb95e4e2002-02-13 16:56:44 +1100103
104 restore_uid();
Darren Tuckerec0943a2003-08-11 22:55:36 +1000105
Damien Miller964fed52001-09-25 12:58:23 +1000106 problem = krb5_verify_user(authctxt->krb5_ctx, authctxt->krb5_user,
Darren Tuckerec0943a2003-08-11 22:55:36 +1000107 ccache, password, 1, NULL);
108
Damien Millerdb95e4e2002-02-13 16:56:44 +1100109 temporarily_use_uid(authctxt->pw);
110
Damien Miller964fed52001-09-25 12:58:23 +1000111 if (problem)
112 goto out;
Darren Tuckerec0943a2003-08-11 22:55:36 +1000113 problem = krb5_cc_gen_new(authctxt->krb5_ctx, &krb5_fcc_ops,
114 &authctxt->krb5_fwd_ccache);
115 if (problem)
116 goto out;
117
118 problem = krb5_cc_copy_cache(authctxt->krb5_ctx, ccache,
119 authctxt->krb5_fwd_ccache);
120 krb5_cc_destroy(authctxt->krb5_ctx, ccache);
121 ccache = NULL;
122 if (problem)
123 goto out;
Damien Millerdb95e4e2002-02-13 16:56:44 +1100124
Damien Millerfd4c9ee2002-04-13 11:04:40 +1000125#else
126 problem = krb5_get_init_creds_password(authctxt->krb5_ctx, &creds,
127 authctxt->krb5_user, (char *)password, NULL, NULL, 0, NULL, NULL);
128 if (problem)
129 goto out;
130
131 problem = krb5_sname_to_principal(authctxt->krb5_ctx, NULL, NULL,
132 KRB5_NT_SRV_HST, &server);
133 if (problem)
134 goto out;
135
136 restore_uid();
137 problem = krb5_verify_init_creds(authctxt->krb5_ctx, &creds, server,
138 NULL, NULL, NULL);
139 krb5_free_principal(authctxt->krb5_ctx, server);
140 temporarily_use_uid(authctxt->pw);
141 if (problem)
142 goto out;
143
144 if (!krb5_kuserok(authctxt->krb5_ctx, authctxt->krb5_user,
145 authctxt->pw->pw_name)) {
Ben Lindstrom5a6abda2002-06-09 19:41:48 +0000146 problem = -1;
Damien Millerfd4c9ee2002-04-13 11:04:40 +1000147 goto out;
148 }
149
150 snprintf(ccname,sizeof(ccname),"FILE:/tmp/krb5cc_%d_XXXXXX",geteuid());
151
152 if ((tmpfd = mkstemp(ccname+strlen("FILE:")))==-1) {
Damien Miller996acd22003-04-09 20:59:48 +1000153 logit("mkstemp(): %.100s", strerror(errno));
Damien Millerfd4c9ee2002-04-13 11:04:40 +1000154 problem = errno;
155 goto out;
156 }
157
158 if (fchmod(tmpfd,S_IRUSR | S_IWUSR) == -1) {
Damien Miller996acd22003-04-09 20:59:48 +1000159 logit("fchmod(): %.100s", strerror(errno));
Damien Millerfd4c9ee2002-04-13 11:04:40 +1000160 close(tmpfd);
161 problem = errno;
162 goto out;
163 }
164 close(tmpfd);
165
166 problem = krb5_cc_resolve(authctxt->krb5_ctx, ccname, &authctxt->krb5_fwd_ccache);
167 if (problem)
168 goto out;
169
170 problem = krb5_cc_initialize(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache,
171 authctxt->krb5_user);
172 if (problem)
173 goto out;
174
175 problem= krb5_cc_store_cred(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache,
176 &creds);
177 if (problem)
178 goto out;
179#endif
180
Damien Miller964fed52001-09-25 12:58:23 +1000181 authctxt->krb5_ticket_file = (char *)krb5_cc_get_name(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache);
Damien Millerdb95e4e2002-02-13 16:56:44 +1100182
Damien Miller964fed52001-09-25 12:58:23 +1000183 out:
184 restore_uid();
Damien Millerdb95e4e2002-02-13 16:56:44 +1100185
Damien Miller964fed52001-09-25 12:58:23 +1000186 if (problem) {
Darren Tuckerec0943a2003-08-11 22:55:36 +1000187 if (ccache)
188 krb5_cc_destroy(authctxt->krb5_ctx, ccache);
189
Damien Millerfd4c9ee2002-04-13 11:04:40 +1000190 if (authctxt->krb5_ctx != NULL && problem!=-1)
Ben Lindstromb8550282002-02-26 17:46:11 +0000191 debug("Kerberos password authentication failed: %s",
192 krb5_get_err_text(authctxt->krb5_ctx, problem));
193 else
194 debug("Kerberos password authentication failed: %d",
195 problem);
Damien Millerdb95e4e2002-02-13 16:56:44 +1100196
Damien Miller964fed52001-09-25 12:58:23 +1000197 krb5_cleanup_proc(authctxt);
Damien Millerdb95e4e2002-02-13 16:56:44 +1100198
Damien Miller964fed52001-09-25 12:58:23 +1000199 if (options.kerberos_or_local_passwd)
200 return (-1);
201 else
202 return (0);
203 }
204 return (1);
205}
206
207void
208krb5_cleanup_proc(void *context)
209{
210 Authctxt *authctxt = (Authctxt *)context;
Damien Millerdb95e4e2002-02-13 16:56:44 +1100211
Damien Miller964fed52001-09-25 12:58:23 +1000212 debug("krb5_cleanup_proc called");
213 if (authctxt->krb5_fwd_ccache) {
214 krb5_cc_destroy(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache);
215 authctxt->krb5_fwd_ccache = NULL;
216 }
217 if (authctxt->krb5_user) {
218 krb5_free_principal(authctxt->krb5_ctx, authctxt->krb5_user);
219 authctxt->krb5_user = NULL;
220 }
Damien Miller964fed52001-09-25 12:58:23 +1000221 if (authctxt->krb5_ctx) {
222 krb5_free_context(authctxt->krb5_ctx);
223 authctxt->krb5_ctx = NULL;
224 }
225}
226
227#endif /* KRB5 */