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  • Committer: Bazaar Package Importer
  • Author(s): Noah Meyerhans
  • Date: 2006-10-31 17:53:38 UTC
  • Revision ID: james.westby@ubuntu.com-20061031175338-kh299ada2qc2kzlb
Tags: upstream-3.8.1p1
Import upstream version 3.8.1p1

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auth-krb5.c
 
1
/*
 
2
 *    Kerberos v5 authentication and ticket-passing routines.
 
3
 *
 
4
 * $FreeBSD: 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
 *
 
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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
 
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"
 
31
RCSID("$OpenBSD: auth-krb5.c,v 1.15 2003/11/21 11:57:02 djm Exp $");
 
32
 
 
33
#include "ssh.h"
 
34
#include "ssh1.h"
 
35
#include "packet.h"
 
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#include "xmalloc.h"
 
37
#include "log.h"
 
38
#include "servconf.h"
 
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#include "uidswap.h"
 
40
#include "auth.h"
 
41
 
 
42
#ifdef KRB5
 
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#include <krb5.h>
 
44
 
 
45
extern ServerOptions     options;
 
46
 
 
47
static int
 
48
krb5_init(void *context)
 
49
{
 
50
        Authctxt *authctxt = (Authctxt *)context;
 
51
        krb5_error_code problem;
 
52
 
 
53
        if (authctxt->krb5_ctx == NULL) {
 
54
                problem = krb5_init_context(&authctxt->krb5_ctx);
 
55
                if (problem)
 
56
                        return (problem);
 
57
#ifdef KRB5_INIT_ETS
 
58
                krb5_init_ets(authctxt->krb5_ctx);
 
59
#endif
 
60
        }
 
61
        return (0);
 
62
}
 
63
 
 
64
int
 
65
auth_krb5_password(Authctxt *authctxt, const char *password)
 
66
{
 
67
#ifndef HEIMDAL
 
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        krb5_creds creds;
 
69
        krb5_principal server;
 
70
        char ccname[40];
 
71
        int tmpfd;
 
72
#endif
 
73
        krb5_error_code problem;
 
74
        krb5_ccache ccache = NULL;
 
75
        int len;
 
76
 
 
77
        if (!authctxt->valid)
 
78
                return (0);
 
79
 
 
80
        temporarily_use_uid(authctxt->pw);
 
81
 
 
82
        problem = krb5_init(authctxt);
 
83
        if (problem)
 
84
                goto out;
 
85
 
 
86
        problem = krb5_parse_name(authctxt->krb5_ctx, authctxt->pw->pw_name,
 
87
                    &authctxt->krb5_user);
 
88
        if (problem)
 
89
                goto out;
 
90
 
 
91
#ifdef HEIMDAL
 
92
        problem = krb5_cc_gen_new(authctxt->krb5_ctx, &krb5_mcc_ops, &ccache);
 
93
        if (problem)
 
94
                goto out;
 
95
 
 
96
        problem = krb5_cc_initialize(authctxt->krb5_ctx, ccache,
 
97
                authctxt->krb5_user);
 
98
        if (problem)
 
99
                goto out;
 
100
 
 
101
        restore_uid();
 
102
 
 
103
        problem = krb5_verify_user(authctxt->krb5_ctx, authctxt->krb5_user,
 
104
            ccache, password, 1, NULL);
 
105
 
 
106
        temporarily_use_uid(authctxt->pw);
 
107
 
 
108
        if (problem)
 
109
                goto out;
 
110
 
 
111
        problem = krb5_cc_gen_new(authctxt->krb5_ctx, &krb5_fcc_ops,
 
112
            &authctxt->krb5_fwd_ccache);
 
113
        if (problem)
 
114
                goto out;
 
115
 
 
116
        problem = krb5_cc_copy_cache(authctxt->krb5_ctx, ccache,
 
117
            authctxt->krb5_fwd_ccache);
 
118
        krb5_cc_destroy(authctxt->krb5_ctx, ccache);
 
119
        ccache = NULL;
 
120
        if (problem)
 
121
                goto out;
 
122
 
 
123
#else
 
124
        problem = krb5_get_init_creds_password(authctxt->krb5_ctx, &creds,
 
125
            authctxt->krb5_user, (char *)password, NULL, NULL, 0, NULL, NULL);
 
126
        if (problem)
 
127
                goto out;
 
128
 
 
129
        problem = krb5_sname_to_principal(authctxt->krb5_ctx, NULL, NULL,
 
130
            KRB5_NT_SRV_HST, &server);
 
131
        if (problem)
 
132
                goto out;
 
133
 
 
134
        restore_uid();
 
135
        problem = krb5_verify_init_creds(authctxt->krb5_ctx, &creds, server,
 
136
            NULL, NULL, NULL);
 
137
        krb5_free_principal(authctxt->krb5_ctx, server);
 
138
        temporarily_use_uid(authctxt->pw);
 
139
        if (problem)
 
140
                goto out;
 
141
 
 
142
        if (!krb5_kuserok(authctxt->krb5_ctx, authctxt->krb5_user,
 
143
                          authctxt->pw->pw_name)) {
 
144
                problem = -1;
 
145
                goto out;
 
146
        }
 
147
 
 
148
        snprintf(ccname,sizeof(ccname),"FILE:/tmp/krb5cc_%d_XXXXXX",geteuid());
 
149
 
 
150
        if ((tmpfd = mkstemp(ccname+strlen("FILE:")))==-1) {
 
151
                logit("mkstemp(): %.100s", strerror(errno));
 
152
                problem = errno;
 
153
                goto out;
 
154
        }
 
155
 
 
156
        if (fchmod(tmpfd,S_IRUSR | S_IWUSR) == -1) {
 
157
                logit("fchmod(): %.100s", strerror(errno));
 
158
                close(tmpfd);
 
159
                problem = errno;
 
160
                goto out;
 
161
        }
 
162
        close(tmpfd);
 
163
 
 
164
        problem = krb5_cc_resolve(authctxt->krb5_ctx, ccname, &authctxt->krb5_fwd_ccache);
 
165
        if (problem)
 
166
                goto out;
 
167
 
 
168
        problem = krb5_cc_initialize(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache,
 
169
                                     authctxt->krb5_user);
 
170
        if (problem)
 
171
                goto out;
 
172
 
 
173
        problem= krb5_cc_store_cred(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache,
 
174
                                 &creds);
 
175
        if (problem)
 
176
                goto out;
 
177
#endif
 
178
 
 
179
        authctxt->krb5_ticket_file = (char *)krb5_cc_get_name(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache);
 
180
 
 
181
        len = strlen(authctxt->krb5_ticket_file) + 6;
 
182
        authctxt->krb5_ccname = xmalloc(len);
 
183
        snprintf(authctxt->krb5_ccname, len, "FILE:%s",
 
184
            authctxt->krb5_ticket_file);
 
185
 
 
186
 out:
 
187
        restore_uid();
 
188
 
 
189
        if (problem) {
 
190
                if (ccache)
 
191
                        krb5_cc_destroy(authctxt->krb5_ctx, ccache);
 
192
 
 
193
                if (authctxt->krb5_ctx != NULL && problem!=-1)
 
194
                        debug("Kerberos password authentication failed: %s",
 
195
                            krb5_get_err_text(authctxt->krb5_ctx, problem));
 
196
                else
 
197
                        debug("Kerberos password authentication failed: %d",
 
198
                            problem);
 
199
 
 
200
                krb5_cleanup_proc(authctxt);
 
201
 
 
202
                if (options.kerberos_or_local_passwd)
 
203
                        return (-1);
 
204
                else
 
205
                        return (0);
 
206
        }
 
207
        return (1);
 
208
}
 
209
 
 
210
void
 
211
krb5_cleanup_proc(Authctxt *authctxt)
 
212
{
 
213
        debug("krb5_cleanup_proc called");
 
214
        if (authctxt->krb5_fwd_ccache) {
 
215
                krb5_cc_destroy(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache);
 
216
                authctxt->krb5_fwd_ccache = NULL;
 
217
        }
 
218
        if (authctxt->krb5_user) {
 
219
                krb5_free_principal(authctxt->krb5_ctx, authctxt->krb5_user);
 
220
                authctxt->krb5_user = NULL;
 
221
        }
 
222
        if (authctxt->krb5_ctx) {
 
223
                krb5_free_context(authctxt->krb5_ctx);
 
224
                authctxt->krb5_ctx = NULL;
 
225
        }
 
226
}
 
227
 
 
228
#endif /* KRB5 */