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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"
08822d99 31RCSID("$OpenBSD: auth-krb5.c,v 1.16 2005/11/21 09:42:10 dtucker 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
45extern ServerOptions options;
46
47static int
48krb5_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);
3c0ef626 57 }
3c0ef626 58 return (0);
59}
60
3c0ef626 61int
62auth_krb5_password(Authctxt *authctxt, const char *password)
63{
63119dd9 64#ifndef HEIMDAL
e444f4cb 65 krb5_creds creds;
63119dd9 66 krb5_principal server;
540d72c3 67#endif
3c0ef626 68 krb5_error_code problem;
7cac2b65 69 krb5_ccache ccache = NULL;
12a403af 70 int len;
e9702f7d 71
3c0ef626 72 temporarily_use_uid(authctxt->pw);
e9702f7d 73
3c0ef626 74 problem = krb5_init(authctxt);
75 if (problem)
76 goto out;
e9702f7d 77
3c0ef626 78 problem = krb5_parse_name(authctxt->krb5_ctx, authctxt->pw->pw_name,
79 &authctxt->krb5_user);
80 if (problem)
81 goto out;
905081a4 82
83#ifdef HEIMDAL
7cac2b65 84 problem = krb5_cc_gen_new(authctxt->krb5_ctx, &krb5_mcc_ops, &ccache);
3c0ef626 85 if (problem)
86 goto out;
e9702f7d 87
7cac2b65 88 problem = krb5_cc_initialize(authctxt->krb5_ctx, ccache,
89 authctxt->krb5_user);
3c0ef626 90 if (problem)
91 goto out;
905081a4 92
e9702f7d 93 restore_uid();
540d72c3 94
3c0ef626 95 problem = krb5_verify_user(authctxt->krb5_ctx, authctxt->krb5_user,
7cac2b65 96 ccache, password, 1, NULL);
540d72c3 97
e444f4cb 98 temporarily_use_uid(authctxt->pw);
99
100 if (problem)
3c0ef626 101 goto out;
540d72c3 102
7cac2b65 103 problem = krb5_cc_gen_new(authctxt->krb5_ctx, &krb5_fcc_ops,
104 &authctxt->krb5_fwd_ccache);
105 if (problem)
106 goto out;
107
108 problem = krb5_cc_copy_cache(authctxt->krb5_ctx, ccache,
109 authctxt->krb5_fwd_ccache);
110 krb5_cc_destroy(authctxt->krb5_ctx, ccache);
111 ccache = NULL;
112 if (problem)
113 goto out;
e444f4cb 114
63119dd9 115#else
905081a4 116 problem = krb5_get_init_creds_password(authctxt->krb5_ctx, &creds,
e444f4cb 117 authctxt->krb5_user, (char *)password, NULL, NULL, 0, NULL, NULL);
118 if (problem)
905081a4 119 goto out;
e444f4cb 120
905081a4 121 problem = krb5_sname_to_principal(authctxt->krb5_ctx, NULL, NULL,
122 KRB5_NT_SRV_HST, &server);
e444f4cb 123 if (problem)
905081a4 124 goto out;
e444f4cb 125
126 restore_uid();
905081a4 127 problem = krb5_verify_init_creds(authctxt->krb5_ctx, &creds, server,
128 NULL, NULL, NULL);
905081a4 129 krb5_free_principal(authctxt->krb5_ctx, server);
63119dd9 130 temporarily_use_uid(authctxt->pw);
e444f4cb 131 if (problem)
132 goto out;
540d72c3 133
134 if (!krb5_kuserok(authctxt->krb5_ctx, authctxt->krb5_user,
e444f4cb 135 authctxt->pw->pw_name)) {
44a053a3 136 problem = -1;
e444f4cb 137 goto out;
540d72c3 138 }
e444f4cb 139
2ce0bfe4 140 problem = ssh_krb5_cc_gen(authctxt->krb5_ctx, &authctxt->krb5_fwd_ccache);
e444f4cb 141 if (problem)
142 goto out;
63119dd9 143
e444f4cb 144 problem = krb5_cc_initialize(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache,
145 authctxt->krb5_user);
905081a4 146 if (problem)
147 goto out;
540d72c3 148
e444f4cb 149 problem= krb5_cc_store_cred(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache,
150 &creds);
151 if (problem)
152 goto out;
540d72c3 153#endif
63119dd9 154
3c0ef626 155 authctxt->krb5_ticket_file = (char *)krb5_cc_get_name(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache);
e9702f7d 156
12a403af 157 len = strlen(authctxt->krb5_ticket_file) + 6;
158 authctxt->krb5_ccname = xmalloc(len);
fe4ad273 159#ifdef USE_CCAPI
160 snprintf(authctxt->krb5_ccname, len, "API:%s",
161 authctxt->krb5_ticket_file);
162#else
12a403af 163 snprintf(authctxt->krb5_ccname, len, "FILE:%s",
164 authctxt->krb5_ticket_file);
fe4ad273 165#endif
12a403af 166
dfddba3d 167#ifdef USE_PAM
168 if (options.use_pam)
169 do_pam_putenv("KRB5CCNAME", authctxt->krb5_ccname);
170#endif
171
3c0ef626 172 out:
173 restore_uid();
e9702f7d 174
3c0ef626 175 if (problem) {
7cac2b65 176 if (ccache)
177 krb5_cc_destroy(authctxt->krb5_ctx, ccache);
178
e444f4cb 179 if (authctxt->krb5_ctx != NULL && problem!=-1)
e9702f7d 180 debug("Kerberos password authentication failed: %s",
181 krb5_get_err_text(authctxt->krb5_ctx, problem));
182 else
183 debug("Kerberos password authentication failed: %d",
184 problem);
185
3c0ef626 186 krb5_cleanup_proc(authctxt);
e9702f7d 187
3c0ef626 188 if (options.kerberos_or_local_passwd)
189 return (-1);
190 else
191 return (0);
192 }
08822d99 193 return (authctxt->valid ? 1 : 0);
3c0ef626 194}
195
196void
540d72c3 197krb5_cleanup_proc(Authctxt *authctxt)
3c0ef626 198{
3c0ef626 199 debug("krb5_cleanup_proc called");
200 if (authctxt->krb5_fwd_ccache) {
201 krb5_cc_destroy(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache);
202 authctxt->krb5_fwd_ccache = NULL;
203 }
204 if (authctxt->krb5_user) {
205 krb5_free_principal(authctxt->krb5_ctx, authctxt->krb5_user);
206 authctxt->krb5_user = NULL;
207 }
3c0ef626 208 if (authctxt->krb5_ctx) {
209 krb5_free_context(authctxt->krb5_ctx);
210 authctxt->krb5_ctx = NULL;
211 }
212}
213
2ce0bfe4 214#ifndef HEIMDAL
215krb5_error_code
216ssh_krb5_cc_gen(krb5_context ctx, krb5_ccache *ccache) {
fe4ad273 217 int ret;
2ce0bfe4 218 char ccname[40];
219 mode_t old_umask;
fe4ad273 220#ifdef USE_CCAPI
221 char cctemplate[] = "API:krb5cc_%d";
222#else
223 char cctemplate[] = "FILE:/tmp/krb5cc_%d_XXXXXXXXXX";
224 int tmpfd;
225#endif
2ce0bfe4 226
227 ret = snprintf(ccname, sizeof(ccname),
fe4ad273 228 cctemplate, geteuid());
c06c9ae8 229 if (ret < 0 || (size_t)ret >= sizeof(ccname))
2ce0bfe4 230 return ENOMEM;
231
fe4ad273 232#ifndef USE_CCAPI
2ce0bfe4 233 old_umask = umask(0177);
234 tmpfd = mkstemp(ccname + strlen("FILE:"));
235 umask(old_umask);
236 if (tmpfd == -1) {
237 logit("mkstemp(): %.100s", strerror(errno));
238 return errno;
239 }
240
241 if (fchmod(tmpfd,S_IRUSR | S_IWUSR) == -1) {
242 logit("fchmod(): %.100s", strerror(errno));
243 close(tmpfd);
244 return errno;
245 }
246 close(tmpfd);
fe4ad273 247#endif
2ce0bfe4 248
249 return (krb5_cc_resolve(ctx, ccname, ccache));
250}
251#endif /* !HEIMDAL */
3c0ef626 252#endif /* KRB5 */
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