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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 1.14 2003/11/04 08:54:09 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 | ||
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 | ||
54 | if (authctxt->krb5_ctx == NULL) { | |
55 | problem = krb5_init_context(&authctxt->krb5_ctx); | |
56 | if (problem) | |
57 | return (problem); | |
58 | krb5_init_ets(authctxt->krb5_ctx); | |
59 | } | |
60 | return (0); | |
61 | } | |
62 | ||
63 | int | |
64 | auth_krb5_password(Authctxt *authctxt, const char *password) | |
65 | { | |
66 | #ifndef HEIMDAL | |
67 | krb5_creds creds; | |
68 | krb5_principal server; | |
69 | char ccname[40]; | |
70 | int tmpfd; | |
71 | #endif | |
72 | krb5_error_code problem; | |
73 | krb5_ccache ccache = NULL; | |
74 | ||
75 | if (!authctxt->valid) | |
76 | return (0); | |
77 | ||
78 | temporarily_use_uid(authctxt->pw); | |
79 | ||
80 | problem = krb5_init(authctxt); | |
81 | if (problem) | |
82 | goto out; | |
83 | ||
84 | problem = krb5_parse_name(authctxt->krb5_ctx, authctxt->pw->pw_name, | |
85 | &authctxt->krb5_user); | |
86 | if (problem) | |
87 | goto out; | |
88 | ||
89 | #ifdef HEIMDAL | |
90 | problem = krb5_cc_gen_new(authctxt->krb5_ctx, &krb5_mcc_ops, &ccache); | |
91 | if (problem) | |
92 | goto out; | |
93 | ||
94 | problem = krb5_cc_initialize(authctxt->krb5_ctx, ccache, | |
95 | authctxt->krb5_user); | |
96 | if (problem) | |
97 | goto out; | |
98 | ||
99 | restore_uid(); | |
100 | ||
101 | problem = krb5_verify_user(authctxt->krb5_ctx, authctxt->krb5_user, | |
102 | ccache, password, 1, NULL); | |
103 | ||
104 | temporarily_use_uid(authctxt->pw); | |
105 | ||
106 | if (problem) | |
107 | goto out; | |
108 | problem = krb5_cc_gen_new(authctxt->krb5_ctx, &krb5_fcc_ops, | |
109 | &authctxt->krb5_fwd_ccache); | |
110 | if (problem) | |
111 | goto out; | |
112 | ||
113 | problem = krb5_cc_copy_cache(authctxt->krb5_ctx, ccache, | |
114 | authctxt->krb5_fwd_ccache); | |
115 | krb5_cc_destroy(authctxt->krb5_ctx, ccache); | |
116 | ccache = NULL; | |
117 | if (problem) | |
118 | goto out; | |
119 | ||
120 | #else | |
121 | problem = krb5_get_init_creds_password(authctxt->krb5_ctx, &creds, | |
122 | authctxt->krb5_user, (char *)password, NULL, NULL, 0, NULL, NULL); | |
123 | if (problem) | |
124 | goto out; | |
125 | ||
126 | problem = krb5_sname_to_principal(authctxt->krb5_ctx, NULL, NULL, | |
127 | KRB5_NT_SRV_HST, &server); | |
128 | if (problem) | |
129 | goto out; | |
130 | ||
131 | restore_uid(); | |
132 | problem = krb5_verify_init_creds(authctxt->krb5_ctx, &creds, server, | |
133 | NULL, NULL, NULL); | |
134 | krb5_free_principal(authctxt->krb5_ctx, server); | |
135 | temporarily_use_uid(authctxt->pw); | |
136 | if (problem) | |
137 | goto out; | |
138 | ||
139 | if (!krb5_kuserok(authctxt->krb5_ctx, authctxt->krb5_user, | |
140 | authctxt->pw->pw_name)) { | |
141 | problem = -1; | |
142 | goto out; | |
143 | } | |
144 | ||
145 | snprintf(ccname,sizeof(ccname),"FILE:/tmp/krb5cc_%d_XXXXXX",geteuid()); | |
146 | ||
147 | if ((tmpfd = mkstemp(ccname+strlen("FILE:")))==-1) { | |
148 | logit("mkstemp(): %.100s", strerror(errno)); | |
149 | problem = errno; | |
150 | goto out; | |
151 | } | |
152 | ||
153 | if (fchmod(tmpfd,S_IRUSR | S_IWUSR) == -1) { | |
154 | logit("fchmod(): %.100s", strerror(errno)); | |
155 | close(tmpfd); | |
156 | problem = errno; | |
157 | goto out; | |
158 | } | |
159 | close(tmpfd); | |
160 | ||
161 | problem = krb5_cc_resolve(authctxt->krb5_ctx, ccname, &authctxt->krb5_fwd_ccache); | |
162 | if (problem) | |
163 | goto out; | |
164 | ||
165 | problem = krb5_cc_initialize(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache, | |
166 | authctxt->krb5_user); | |
167 | if (problem) | |
168 | goto out; | |
169 | ||
170 | problem= krb5_cc_store_cred(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache, | |
171 | &creds); | |
172 | if (problem) | |
173 | goto out; | |
174 | #endif | |
175 | ||
176 | authctxt->krb5_ticket_file = (char *)krb5_cc_get_name(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache); | |
177 | ||
178 | out: | |
179 | restore_uid(); | |
180 | ||
181 | if (problem) { | |
182 | if (ccache) | |
183 | krb5_cc_destroy(authctxt->krb5_ctx, ccache); | |
184 | ||
185 | if (authctxt->krb5_ctx != NULL && problem!=-1) | |
186 | debug("Kerberos password authentication failed: %s", | |
187 | krb5_get_err_text(authctxt->krb5_ctx, problem)); | |
188 | else | |
189 | debug("Kerberos password authentication failed: %d", | |
190 | problem); | |
191 | ||
192 | krb5_cleanup_proc(authctxt); | |
193 | ||
194 | if (options.kerberos_or_local_passwd) | |
195 | return (-1); | |
196 | else | |
197 | return (0); | |
198 | } | |
199 | return (1); | |
200 | } | |
201 | ||
202 | void | |
203 | krb5_cleanup_proc(Authctxt *authctxt) | |
204 | { | |
205 | debug("krb5_cleanup_proc called"); | |
206 | if (authctxt->krb5_fwd_ccache) { | |
207 | krb5_cc_destroy(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache); | |
208 | authctxt->krb5_fwd_ccache = NULL; | |
209 | } | |
210 | if (authctxt->krb5_user) { | |
211 | krb5_free_principal(authctxt->krb5_ctx, authctxt->krb5_user); | |
212 | authctxt->krb5_user = NULL; | |
213 | } | |
214 | if (authctxt->krb5_ctx) { | |
215 | krb5_free_context(authctxt->krb5_ctx); | |
216 | authctxt->krb5_ctx = NULL; | |
217 | } | |
218 | } | |
219 | ||
220 | #endif /* KRB5 */ |