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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 1.15 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 | mode_t old_umask; | |
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 | old_umask = umask(0177); | |
152 | tmpfd = mkstemp(ccname + strlen("FILE:")); | |
153 | umask(old_umask); | |
154 | if (tmpfd == -1) { | |
155 | logit("mkstemp(): %.100s", strerror(errno)); | |
156 | problem = errno; | |
157 | goto out; | |
158 | } | |
159 | ||
160 | if (fchmod(tmpfd,S_IRUSR | S_IWUSR) == -1) { | |
161 | logit("fchmod(): %.100s", strerror(errno)); | |
162 | close(tmpfd); | |
163 | problem = errno; | |
164 | goto out; | |
165 | } | |
166 | close(tmpfd); | |
167 | ||
168 | problem = krb5_cc_resolve(authctxt->krb5_ctx, ccname, &authctxt->krb5_fwd_ccache); | |
169 | if (problem) | |
170 | goto out; | |
171 | ||
172 | problem = krb5_cc_initialize(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache, | |
173 | authctxt->krb5_user); | |
174 | if (problem) | |
175 | goto out; | |
176 | ||
177 | problem= krb5_cc_store_cred(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache, | |
178 | &creds); | |
179 | if (problem) | |
180 | goto out; | |
181 | #endif | |
182 | ||
183 | authctxt->krb5_ticket_file = (char *)krb5_cc_get_name(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache); | |
184 | ||
185 | len = strlen(authctxt->krb5_ticket_file) + 6; | |
186 | authctxt->krb5_ccname = xmalloc(len); | |
187 | snprintf(authctxt->krb5_ccname, len, "FILE:%s", | |
188 | authctxt->krb5_ticket_file); | |
189 | ||
190 | out: | |
191 | restore_uid(); | |
192 | ||
193 | if (problem) { | |
194 | if (ccache) | |
195 | krb5_cc_destroy(authctxt->krb5_ctx, ccache); | |
196 | ||
197 | if (authctxt->krb5_ctx != NULL && problem!=-1) | |
198 | debug("Kerberos password authentication failed: %s", | |
199 | krb5_get_err_text(authctxt->krb5_ctx, problem)); | |
200 | else | |
201 | debug("Kerberos password authentication failed: %d", | |
202 | problem); | |
203 | ||
204 | krb5_cleanup_proc(authctxt); | |
205 | ||
206 | if (options.kerberos_or_local_passwd) | |
207 | return (-1); | |
208 | else | |
209 | return (0); | |
210 | } | |
211 | return (1); | |
212 | } | |
213 | ||
214 | void | |
215 | krb5_cleanup_proc(Authctxt *authctxt) | |
216 | { | |
217 | debug("krb5_cleanup_proc called"); | |
218 | if (authctxt->krb5_fwd_ccache) { | |
219 | krb5_cc_destroy(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache); | |
220 | authctxt->krb5_fwd_ccache = NULL; | |
221 | } | |
222 | if (authctxt->krb5_user) { | |
223 | krb5_free_principal(authctxt->krb5_ctx, authctxt->krb5_user); | |
224 | authctxt->krb5_user = NULL; | |
225 | } | |
226 | if (authctxt->krb5_ctx) { | |
227 | krb5_free_context(authctxt->krb5_ctx); | |
228 | authctxt->krb5_ctx = NULL; | |
229 | } | |
230 | } | |
231 | ||
232 | #endif /* KRB5 */ |