1/*
2 * Kerberos v5 authentication and ticket-passing routines.
3 *
4 * $xFreeBSD: src/crypto/openssh/auth-krb5.c,v 1.6 2001/02/13 16:58:04 assar Exp$
5 */
6/*
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 */
29
30#include "includes.h"
31RCSID("$OpenBSD: auth-krb5.c,v 1.15 2003/11/21 11:57:02 djm Exp $");
|
32RCSID("$FreeBSD: head/crypto/openssh/auth-krb5.c 126277 2004-02-26 10:52:33Z des $");
|
| 32RCSID("$FreeBSD: head/crypto/openssh/auth-krb5.c 128460 2004-04-20 09:46:41Z des $"); |
33
34#include "ssh.h"
35#include "ssh1.h"
36#include "packet.h"
37#include "xmalloc.h"
38#include "log.h"
39#include "servconf.h"
40#include "uidswap.h"
41#include "auth.h"
42
43#ifdef KRB5
44#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
54 if (authctxt->krb5_ctx == NULL) {
55 problem = krb5_init_context(&authctxt->krb5_ctx);
56 if (problem)
57 return (problem);
|
| 58#ifdef KRB5_INIT_ETS |
59 krb5_init_ets(authctxt->krb5_ctx);
|
| 60#endif |
61 }
62 return (0);
63}
64
65int
66auth_krb5_password(Authctxt *authctxt, const char *password)
67{
68#ifndef HEIMDAL
69 krb5_creds creds;
70 krb5_principal server;
71 char ccname[40];
72 int tmpfd;
73#endif
74 krb5_error_code problem;
75 krb5_ccache ccache = NULL;
|
| 76 int len; |
77
78 if (!authctxt->valid)
79 return (0);
80
81 temporarily_use_uid(authctxt->pw);
82
83 problem = krb5_init(authctxt);
84 if (problem)
85 goto out;
86
87 problem = krb5_parse_name(authctxt->krb5_ctx, authctxt->pw->pw_name,
88 &authctxt->krb5_user);
89 if (problem)
90 goto out;
91
92#ifdef HEIMDAL
93 problem = krb5_cc_gen_new(authctxt->krb5_ctx, &krb5_mcc_ops, &ccache);
94 if (problem)
95 goto out;
96
97 problem = krb5_cc_initialize(authctxt->krb5_ctx, ccache,
98 authctxt->krb5_user);
99 if (problem)
100 goto out;
101
102 restore_uid();
103
104 problem = krb5_verify_user(authctxt->krb5_ctx, authctxt->krb5_user,
105 ccache, password, 1, NULL);
106
107 temporarily_use_uid(authctxt->pw);
108
109 if (problem)
110 goto out;
111
112 problem = krb5_cc_gen_new(authctxt->krb5_ctx, &krb5_fcc_ops,
113 &authctxt->krb5_fwd_ccache);
114 if (problem)
115 goto out;
116
117 problem = krb5_cc_copy_cache(authctxt->krb5_ctx, ccache,
118 authctxt->krb5_fwd_ccache);
119 krb5_cc_destroy(authctxt->krb5_ctx, ccache);
120 ccache = NULL;
121 if (problem)
122 goto out;
123
124#else
125 problem = krb5_get_init_creds_password(authctxt->krb5_ctx, &creds,
126 authctxt->krb5_user, (char *)password, NULL, NULL, 0, NULL, NULL);
127 if (problem)
128 goto out;
129
130 problem = krb5_sname_to_principal(authctxt->krb5_ctx, NULL, NULL,
131 KRB5_NT_SRV_HST, &server);
132 if (problem)
133 goto out;
134
135 restore_uid();
136 problem = krb5_verify_init_creds(authctxt->krb5_ctx, &creds, server,
137 NULL, NULL, NULL);
138 krb5_free_principal(authctxt->krb5_ctx, server);
139 temporarily_use_uid(authctxt->pw);
140 if (problem)
141 goto out;
142
143 if (!krb5_kuserok(authctxt->krb5_ctx, authctxt->krb5_user,
144 authctxt->pw->pw_name)) {
145 problem = -1;
146 goto out;
147 }
148
149 snprintf(ccname,sizeof(ccname),"FILE:/tmp/krb5cc_%d_XXXXXX",geteuid());
150
151 if ((tmpfd = mkstemp(ccname+strlen("FILE:")))==-1) {
152 logit("mkstemp(): %.100s", strerror(errno));
153 problem = errno;
154 goto out;
155 }
156
157 if (fchmod(tmpfd,S_IRUSR | S_IWUSR) == -1) {
158 logit("fchmod(): %.100s", strerror(errno));
159 close(tmpfd);
160 problem = errno;
161 goto out;
162 }
163 close(tmpfd);
164
165 problem = krb5_cc_resolve(authctxt->krb5_ctx, ccname, &authctxt->krb5_fwd_ccache);
166 if (problem)
167 goto out;
168
169 problem = krb5_cc_initialize(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache,
170 authctxt->krb5_user);
171 if (problem)
172 goto out;
173
174 problem= krb5_cc_store_cred(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache,
175 &creds);
176 if (problem)
177 goto out;
178#endif
179
180 authctxt->krb5_ticket_file = (char *)krb5_cc_get_name(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache);
181
|
182 len = strlen(authctxt->krb5_ticket_file) + 6;
183 authctxt->krb5_ccname = xmalloc(len);
184 snprintf(authctxt->krb5_ccname, len, "FILE:%s",
185 authctxt->krb5_ticket_file);
186 |
187 out:
188 restore_uid();
189
190 if (problem) {
191 if (ccache)
192 krb5_cc_destroy(authctxt->krb5_ctx, ccache);
193
194 if (authctxt->krb5_ctx != NULL && problem!=-1)
195 debug("Kerberos password authentication failed: %s",
196 krb5_get_err_text(authctxt->krb5_ctx, problem));
197 else
198 debug("Kerberos password authentication failed: %d",
199 problem);
200
201 krb5_cleanup_proc(authctxt);
202
203 if (options.kerberos_or_local_passwd)
204 return (-1);
205 else
206 return (0);
207 }
208 return (1);
209}
210
211void
212krb5_cleanup_proc(Authctxt *authctxt)
213{
214 debug("krb5_cleanup_proc called");
215 if (authctxt->krb5_fwd_ccache) {
216 krb5_cc_destroy(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache);
217 authctxt->krb5_fwd_ccache = NULL;
218 }
219 if (authctxt->krb5_user) {
220 krb5_free_principal(authctxt->krb5_ctx, authctxt->krb5_user);
221 authctxt->krb5_user = NULL;
222 }
223 if (authctxt->krb5_ctx) {
224 krb5_free_context(authctxt->krb5_ctx);
225 authctxt->krb5_ctx = NULL;
226 }
227}
228
229#endif /* KRB5 */
|