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3c0ef626 | 1 | /* |
2 | * Kerberos v5 authentication and ticket-passing routines. | |
350391c5 | 3 | * |
3c0ef626 | 4 | * $FreeBSD: src/crypto/openssh/auth-krb5.c,v 1.6 2001/02/13 16:58:04 assar Exp $ |
3c0ef626 | 5 | */ |
350391c5 | 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 | */ | |
3c0ef626 | 29 | |
30 | #include "includes.h" | |
540d72c3 | 31 | RCSID("$OpenBSD: auth-krb5.c,v 1.15 2003/11/21 11:57:02 djm Exp $"); |
e9702f7d | 32 | |
3c0ef626 | 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; | |
e9702f7d | 52 | |
3c0ef626 | 53 | if (authctxt->krb5_ctx == NULL) { |
54 | problem = krb5_init_context(&authctxt->krb5_ctx); | |
55 | if (problem) | |
56 | return (problem); | |
12a403af | 57 | #ifdef KRB5_INIT_ETS |
3c0ef626 | 58 | krb5_init_ets(authctxt->krb5_ctx); |
12a403af | 59 | #endif |
3c0ef626 | 60 | } |
3c0ef626 | 61 | return (0); |
62 | } | |
63 | ||
3c0ef626 | 64 | int |
65 | auth_krb5_password(Authctxt *authctxt, const char *password) | |
66 | { | |
63119dd9 | 67 | #ifndef HEIMDAL |
e444f4cb | 68 | krb5_creds creds; |
63119dd9 | 69 | krb5_principal server; |
e444f4cb | 70 | char ccname[40]; |
71 | int tmpfd; | |
540d72c3 | 72 | #endif |
3c0ef626 | 73 | krb5_error_code problem; |
7cac2b65 | 74 | krb5_ccache ccache = NULL; |
12a403af | 75 | int len; |
e9702f7d | 76 | |
540d72c3 | 77 | if (!authctxt->valid) |
3c0ef626 | 78 | return (0); |
e9702f7d | 79 | |
3c0ef626 | 80 | temporarily_use_uid(authctxt->pw); |
e9702f7d | 81 | |
3c0ef626 | 82 | problem = krb5_init(authctxt); |
83 | if (problem) | |
84 | goto out; | |
e9702f7d | 85 | |
3c0ef626 | 86 | problem = krb5_parse_name(authctxt->krb5_ctx, authctxt->pw->pw_name, |
87 | &authctxt->krb5_user); | |
88 | if (problem) | |
89 | goto out; | |
905081a4 | 90 | |
91 | #ifdef HEIMDAL | |
7cac2b65 | 92 | problem = krb5_cc_gen_new(authctxt->krb5_ctx, &krb5_mcc_ops, &ccache); |
3c0ef626 | 93 | if (problem) |
94 | goto out; | |
e9702f7d | 95 | |
7cac2b65 | 96 | problem = krb5_cc_initialize(authctxt->krb5_ctx, ccache, |
97 | authctxt->krb5_user); | |
3c0ef626 | 98 | if (problem) |
99 | goto out; | |
905081a4 | 100 | |
e9702f7d | 101 | restore_uid(); |
540d72c3 | 102 | |
3c0ef626 | 103 | problem = krb5_verify_user(authctxt->krb5_ctx, authctxt->krb5_user, |
7cac2b65 | 104 | ccache, password, 1, NULL); |
540d72c3 | 105 | |
e444f4cb | 106 | temporarily_use_uid(authctxt->pw); |
107 | ||
108 | if (problem) | |
3c0ef626 | 109 | goto out; |
540d72c3 | 110 | |
7cac2b65 | 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; | |
e444f4cb | 122 | |
63119dd9 | 123 | #else |
905081a4 | 124 | problem = krb5_get_init_creds_password(authctxt->krb5_ctx, &creds, |
e444f4cb | 125 | authctxt->krb5_user, (char *)password, NULL, NULL, 0, NULL, NULL); |
126 | if (problem) | |
905081a4 | 127 | goto out; |
e444f4cb | 128 | |
905081a4 | 129 | problem = krb5_sname_to_principal(authctxt->krb5_ctx, NULL, NULL, |
130 | KRB5_NT_SRV_HST, &server); | |
e444f4cb | 131 | if (problem) |
905081a4 | 132 | goto out; |
e444f4cb | 133 | |
134 | restore_uid(); | |
905081a4 | 135 | problem = krb5_verify_init_creds(authctxt->krb5_ctx, &creds, server, |
136 | NULL, NULL, NULL); | |
905081a4 | 137 | krb5_free_principal(authctxt->krb5_ctx, server); |
63119dd9 | 138 | temporarily_use_uid(authctxt->pw); |
e444f4cb | 139 | if (problem) |
140 | goto out; | |
540d72c3 | 141 | |
142 | if (!krb5_kuserok(authctxt->krb5_ctx, authctxt->krb5_user, | |
e444f4cb | 143 | authctxt->pw->pw_name)) { |
44a053a3 | 144 | problem = -1; |
e444f4cb | 145 | goto out; |
540d72c3 | 146 | } |
e444f4cb | 147 | |
148 | snprintf(ccname,sizeof(ccname),"FILE:/tmp/krb5cc_%d_XXXXXX",geteuid()); | |
540d72c3 | 149 | |
e444f4cb | 150 | if ((tmpfd = mkstemp(ccname+strlen("FILE:")))==-1) { |
7cac2b65 | 151 | logit("mkstemp(): %.100s", strerror(errno)); |
e444f4cb | 152 | problem = errno; |
905081a4 | 153 | goto out; |
154 | } | |
540d72c3 | 155 | |
e444f4cb | 156 | if (fchmod(tmpfd,S_IRUSR | S_IWUSR) == -1) { |
7cac2b65 | 157 | logit("fchmod(): %.100s", strerror(errno)); |
e444f4cb | 158 | close(tmpfd); |
159 | problem = errno; | |
905081a4 | 160 | goto out; |
161 | } | |
e444f4cb | 162 | close(tmpfd); |
163 | ||
164 | problem = krb5_cc_resolve(authctxt->krb5_ctx, ccname, &authctxt->krb5_fwd_ccache); | |
165 | if (problem) | |
166 | goto out; | |
63119dd9 | 167 | |
e444f4cb | 168 | problem = krb5_cc_initialize(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache, |
169 | authctxt->krb5_user); | |
905081a4 | 170 | if (problem) |
171 | goto out; | |
540d72c3 | 172 | |
e444f4cb | 173 | problem= krb5_cc_store_cred(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache, |
174 | &creds); | |
175 | if (problem) | |
176 | goto out; | |
540d72c3 | 177 | #endif |
63119dd9 | 178 | |
3c0ef626 | 179 | authctxt->krb5_ticket_file = (char *)krb5_cc_get_name(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache); |
e9702f7d | 180 | |
12a403af | 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 | ||
3c0ef626 | 186 | out: |
187 | restore_uid(); | |
e9702f7d | 188 | |
3c0ef626 | 189 | if (problem) { |
7cac2b65 | 190 | if (ccache) |
191 | krb5_cc_destroy(authctxt->krb5_ctx, ccache); | |
192 | ||
e444f4cb | 193 | if (authctxt->krb5_ctx != NULL && problem!=-1) |
e9702f7d | 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 | ||
3c0ef626 | 200 | krb5_cleanup_proc(authctxt); |
e9702f7d | 201 | |
3c0ef626 | 202 | if (options.kerberos_or_local_passwd) |
203 | return (-1); | |
204 | else | |
205 | return (0); | |
206 | } | |
207 | return (1); | |
208 | } | |
209 | ||
210 | void | |
540d72c3 | 211 | krb5_cleanup_proc(Authctxt *authctxt) |
3c0ef626 | 212 | { |
3c0ef626 | 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 | } | |
3c0ef626 | 222 | if (authctxt->krb5_ctx) { |
223 | krb5_free_context(authctxt->krb5_ctx); | |
224 | authctxt->krb5_ctx = NULL; | |
225 | } | |
226 | } | |
227 | ||
228 | #endif /* KRB5 */ |