]>
Commit | Line | Data |
---|---|---|
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 | * | |
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" | |
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" | |
36 | #include "xmalloc.h" | |
37 | #include "log.h" | |
38 | #include "servconf.h" | |
39 | #include "uidswap.h" | |
40 | #include "auth.h" | |
41 | ||
42 | #ifdef KRB5 | |
43 | #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 | |
68 | 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 */ |