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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; | |
7e82606e | 72 | mode_t old_umask; |
540d72c3 | 73 | #endif |
3c0ef626 | 74 | krb5_error_code problem; |
7cac2b65 | 75 | krb5_ccache ccache = NULL; |
12a403af | 76 | int len; |
e9702f7d | 77 | |
540d72c3 | 78 | if (!authctxt->valid) |
3c0ef626 | 79 | return (0); |
e9702f7d | 80 | |
3c0ef626 | 81 | temporarily_use_uid(authctxt->pw); |
e9702f7d | 82 | |
3c0ef626 | 83 | problem = krb5_init(authctxt); |
84 | if (problem) | |
85 | goto out; | |
e9702f7d | 86 | |
3c0ef626 | 87 | problem = krb5_parse_name(authctxt->krb5_ctx, authctxt->pw->pw_name, |
88 | &authctxt->krb5_user); | |
89 | if (problem) | |
90 | goto out; | |
905081a4 | 91 | |
92 | #ifdef HEIMDAL | |
7cac2b65 | 93 | problem = krb5_cc_gen_new(authctxt->krb5_ctx, &krb5_mcc_ops, &ccache); |
3c0ef626 | 94 | if (problem) |
95 | goto out; | |
e9702f7d | 96 | |
7cac2b65 | 97 | problem = krb5_cc_initialize(authctxt->krb5_ctx, ccache, |
98 | authctxt->krb5_user); | |
3c0ef626 | 99 | if (problem) |
100 | goto out; | |
905081a4 | 101 | |
e9702f7d | 102 | restore_uid(); |
540d72c3 | 103 | |
3c0ef626 | 104 | problem = krb5_verify_user(authctxt->krb5_ctx, authctxt->krb5_user, |
7cac2b65 | 105 | ccache, password, 1, NULL); |
540d72c3 | 106 | |
e444f4cb | 107 | temporarily_use_uid(authctxt->pw); |
108 | ||
109 | if (problem) | |
3c0ef626 | 110 | goto out; |
540d72c3 | 111 | |
7cac2b65 | 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; | |
e444f4cb | 123 | |
63119dd9 | 124 | #else |
905081a4 | 125 | problem = krb5_get_init_creds_password(authctxt->krb5_ctx, &creds, |
e444f4cb | 126 | authctxt->krb5_user, (char *)password, NULL, NULL, 0, NULL, NULL); |
127 | if (problem) | |
905081a4 | 128 | goto out; |
e444f4cb | 129 | |
905081a4 | 130 | problem = krb5_sname_to_principal(authctxt->krb5_ctx, NULL, NULL, |
131 | KRB5_NT_SRV_HST, &server); | |
e444f4cb | 132 | if (problem) |
905081a4 | 133 | goto out; |
e444f4cb | 134 | |
135 | restore_uid(); | |
905081a4 | 136 | problem = krb5_verify_init_creds(authctxt->krb5_ctx, &creds, server, |
137 | NULL, NULL, NULL); | |
905081a4 | 138 | krb5_free_principal(authctxt->krb5_ctx, server); |
63119dd9 | 139 | temporarily_use_uid(authctxt->pw); |
e444f4cb | 140 | if (problem) |
141 | goto out; | |
540d72c3 | 142 | |
143 | if (!krb5_kuserok(authctxt->krb5_ctx, authctxt->krb5_user, | |
e444f4cb | 144 | authctxt->pw->pw_name)) { |
44a053a3 | 145 | problem = -1; |
e444f4cb | 146 | goto out; |
540d72c3 | 147 | } |
e444f4cb | 148 | |
149 | snprintf(ccname,sizeof(ccname),"FILE:/tmp/krb5cc_%d_XXXXXX",geteuid()); | |
540d72c3 | 150 | |
7e82606e | 151 | old_umask = umask(0177); |
152 | tmpfd = mkstemp(ccname + strlen("FILE:")); | |
153 | umask(old_umask); | |
154 | if (tmpfd == -1) { | |
7cac2b65 | 155 | logit("mkstemp(): %.100s", strerror(errno)); |
e444f4cb | 156 | problem = errno; |
905081a4 | 157 | goto out; |
158 | } | |
540d72c3 | 159 | |
e444f4cb | 160 | if (fchmod(tmpfd,S_IRUSR | S_IWUSR) == -1) { |
7cac2b65 | 161 | logit("fchmod(): %.100s", strerror(errno)); |
e444f4cb | 162 | close(tmpfd); |
163 | problem = errno; | |
905081a4 | 164 | goto out; |
165 | } | |
e444f4cb | 166 | close(tmpfd); |
167 | ||
168 | problem = krb5_cc_resolve(authctxt->krb5_ctx, ccname, &authctxt->krb5_fwd_ccache); | |
169 | if (problem) | |
170 | goto out; | |
63119dd9 | 171 | |
e444f4cb | 172 | problem = krb5_cc_initialize(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache, |
173 | authctxt->krb5_user); | |
905081a4 | 174 | if (problem) |
175 | goto out; | |
540d72c3 | 176 | |
e444f4cb | 177 | problem= krb5_cc_store_cred(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache, |
178 | &creds); | |
179 | if (problem) | |
180 | goto out; | |
540d72c3 | 181 | #endif |
63119dd9 | 182 | |
3c0ef626 | 183 | authctxt->krb5_ticket_file = (char *)krb5_cc_get_name(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache); |
e9702f7d | 184 | |
12a403af | 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 | ||
dfddba3d | 190 | #ifdef USE_PAM |
191 | if (options.use_pam) | |
192 | do_pam_putenv("KRB5CCNAME", authctxt->krb5_ccname); | |
193 | #endif | |
194 | ||
3c0ef626 | 195 | out: |
196 | restore_uid(); | |
e9702f7d | 197 | |
3c0ef626 | 198 | if (problem) { |
7cac2b65 | 199 | if (ccache) |
200 | krb5_cc_destroy(authctxt->krb5_ctx, ccache); | |
201 | ||
e444f4cb | 202 | if (authctxt->krb5_ctx != NULL && problem!=-1) |
e9702f7d | 203 | debug("Kerberos password authentication failed: %s", |
204 | krb5_get_err_text(authctxt->krb5_ctx, problem)); | |
205 | else | |
206 | debug("Kerberos password authentication failed: %d", | |
207 | problem); | |
208 | ||
3c0ef626 | 209 | krb5_cleanup_proc(authctxt); |
e9702f7d | 210 | |
3c0ef626 | 211 | if (options.kerberos_or_local_passwd) |
212 | return (-1); | |
213 | else | |
214 | return (0); | |
215 | } | |
216 | return (1); | |
217 | } | |
218 | ||
219 | void | |
540d72c3 | 220 | krb5_cleanup_proc(Authctxt *authctxt) |
3c0ef626 | 221 | { |
3c0ef626 | 222 | debug("krb5_cleanup_proc called"); |
223 | if (authctxt->krb5_fwd_ccache) { | |
224 | krb5_cc_destroy(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache); | |
225 | authctxt->krb5_fwd_ccache = NULL; | |
226 | } | |
227 | if (authctxt->krb5_user) { | |
228 | krb5_free_principal(authctxt->krb5_ctx, authctxt->krb5_user); | |
229 | authctxt->krb5_user = NULL; | |
230 | } | |
3c0ef626 | 231 | if (authctxt->krb5_ctx) { |
232 | krb5_free_context(authctxt->krb5_ctx); | |
233 | authctxt->krb5_ctx = NULL; | |
234 | } | |
235 | } | |
236 | ||
237 | #endif /* KRB5 */ |