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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 1.12 2003/08/28 12:54:34 markus 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 | ||
44 | #include <krb5.h> | |
45 | ||
46 | extern ServerOptions options; | |
47 | ||
48 | static int | |
49 | krb5_init(void *context) | |
50 | { | |
51 | Authctxt *authctxt = (Authctxt *)context; | |
52 | krb5_error_code problem; | |
53 | static int cleanup_registered = 0; | |
54 | ||
55 | 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 | ||
68 | int | |
69 | auth_krb5_password(Authctxt *authctxt, const char *password) | |
70 | { | |
71 | #ifndef HEIMDAL | |
72 | krb5_creds creds; | |
73 | krb5_principal server; | |
74 | char ccname[40]; | |
75 | int tmpfd; | |
76 | #endif | |
77 | krb5_error_code problem; | |
78 | krb5_ccache ccache = NULL; | |
79 | ||
80 | if (authctxt->pw == NULL) | |
81 | return (0); | |
82 | ||
83 | temporarily_use_uid(authctxt->pw); | |
84 | ||
85 | problem = krb5_init(authctxt); | |
86 | if (problem) | |
87 | goto out; | |
88 | ||
89 | problem = krb5_parse_name(authctxt->krb5_ctx, authctxt->pw->pw_name, | |
90 | &authctxt->krb5_user); | |
91 | if (problem) | |
92 | goto out; | |
93 | ||
94 | #ifdef HEIMDAL | |
95 | problem = krb5_cc_gen_new(authctxt->krb5_ctx, &krb5_mcc_ops, &ccache); | |
96 | if (problem) | |
97 | goto out; | |
98 | ||
99 | problem = krb5_cc_initialize(authctxt->krb5_ctx, ccache, | |
100 | authctxt->krb5_user); | |
101 | if (problem) | |
102 | goto out; | |
103 | ||
104 | restore_uid(); | |
105 | ||
106 | problem = krb5_verify_user(authctxt->krb5_ctx, authctxt->krb5_user, | |
107 | ccache, password, 1, NULL); | |
108 | ||
109 | temporarily_use_uid(authctxt->pw); | |
110 | ||
111 | if (problem) | |
112 | goto out; | |
113 | 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; | |
124 | ||
125 | #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)) { | |
146 | problem = -1; | |
147 | goto out; | |
148 | } | |
149 | ||
150 | snprintf(ccname,sizeof(ccname),"FILE:/tmp/krb5cc_%d_XXXXXX",geteuid()); | |
151 | ||
152 | if ((tmpfd = mkstemp(ccname+strlen("FILE:")))==-1) { | |
153 | logit("mkstemp(): %.100s", strerror(errno)); | |
154 | problem = errno; | |
155 | goto out; | |
156 | } | |
157 | ||
158 | if (fchmod(tmpfd,S_IRUSR | S_IWUSR) == -1) { | |
159 | logit("fchmod(): %.100s", strerror(errno)); | |
160 | 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 | ||
181 | authctxt->krb5_ticket_file = (char *)krb5_cc_get_name(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache); | |
182 | ||
183 | out: | |
184 | restore_uid(); | |
185 | ||
186 | if (problem) { | |
187 | if (ccache) | |
188 | krb5_cc_destroy(authctxt->krb5_ctx, ccache); | |
189 | ||
190 | if (authctxt->krb5_ctx != NULL && problem!=-1) | |
191 | 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); | |
196 | ||
197 | krb5_cleanup_proc(authctxt); | |
198 | ||
199 | if (options.kerberos_or_local_passwd) | |
200 | return (-1); | |
201 | else | |
202 | return (0); | |
203 | } | |
204 | return (1); | |
205 | } | |
206 | ||
207 | void | |
208 | krb5_cleanup_proc(void *context) | |
209 | { | |
210 | Authctxt *authctxt = (Authctxt *)context; | |
211 | ||
212 | 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 | } | |
221 | if (authctxt->krb5_ctx) { | |
222 | krb5_free_context(authctxt->krb5_ctx); | |
223 | authctxt->krb5_ctx = NULL; | |
224 | } | |
225 | } | |
226 | ||
227 | #endif /* KRB5 */ |