1 /* $OpenBSD: auth-krb5.c,v 1.19 2006/08/03 03:34:41 deraadt Exp $ */
3 * Kerberos v5 authentication and ticket-passing routines.
5 * $xFreeBSD: src/crypto/openssh/auth-krb5.c,v 1.6 2001/02/13 16:58:04 assar Exp$
8 * Copyright (c) 2002 Daniel Kouril. All rights reserved.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 #include <sys/types.h>
56 extern ServerOptions options;
59 krb5_init(void *context)
61 Authctxt *authctxt = (Authctxt *)context;
62 krb5_error_code problem;
64 if (authctxt->krb5_ctx == NULL) {
65 problem = krb5_init_context(&authctxt->krb5_ctx);
73 auth_krb5_password(Authctxt *authctxt, const char *password)
77 krb5_principal server;
79 krb5_error_code problem;
80 krb5_ccache ccache = NULL;
83 temporarily_use_uid(authctxt->pw);
85 problem = krb5_init(authctxt);
89 problem = krb5_parse_name(authctxt->krb5_ctx, authctxt->pw->pw_name,
90 &authctxt->krb5_user);
95 problem = krb5_cc_gen_new(authctxt->krb5_ctx, &krb5_mcc_ops, &ccache);
99 problem = krb5_cc_initialize(authctxt->krb5_ctx, ccache,
100 authctxt->krb5_user);
106 problem = krb5_verify_user(authctxt->krb5_ctx, authctxt->krb5_user,
107 ccache, password, 1, NULL);
109 temporarily_use_uid(authctxt->pw);
114 problem = krb5_cc_gen_new(authctxt->krb5_ctx, &krb5_fcc_ops,
115 &authctxt->krb5_fwd_ccache);
119 problem = krb5_cc_copy_cache(authctxt->krb5_ctx, ccache,
120 authctxt->krb5_fwd_ccache);
121 krb5_cc_destroy(authctxt->krb5_ctx, ccache);
127 problem = krb5_get_init_creds_password(authctxt->krb5_ctx, &creds,
128 authctxt->krb5_user, (char *)password, NULL, NULL, 0, NULL, NULL);
132 problem = krb5_sname_to_principal(authctxt->krb5_ctx, NULL, NULL,
133 KRB5_NT_SRV_HST, &server);
138 problem = krb5_verify_init_creds(authctxt->krb5_ctx, &creds, server,
140 krb5_free_principal(authctxt->krb5_ctx, server);
141 temporarily_use_uid(authctxt->pw);
145 if (!krb5_kuserok(authctxt->krb5_ctx, authctxt->krb5_user,
146 authctxt->pw->pw_name)) {
151 problem = ssh_krb5_cc_gen(authctxt->krb5_ctx, &authctxt->krb5_fwd_ccache);
155 problem = krb5_cc_initialize(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache,
156 authctxt->krb5_user);
160 problem= krb5_cc_store_cred(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache,
166 authctxt->krb5_ticket_file = (char *)krb5_cc_get_name(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache);
168 len = strlen(authctxt->krb5_ticket_file) + 6;
169 authctxt->krb5_ccname = xmalloc(len);
170 snprintf(authctxt->krb5_ccname, len, "FILE:%s",
171 authctxt->krb5_ticket_file);
175 do_pam_putenv("KRB5CCNAME", authctxt->krb5_ccname);
183 krb5_cc_destroy(authctxt->krb5_ctx, ccache);
185 if (authctxt->krb5_ctx != NULL && problem!=-1)
186 debug("Kerberos password authentication failed: %s",
187 krb5_get_err_text(authctxt->krb5_ctx, problem));
189 debug("Kerberos password authentication failed: %d",
192 krb5_cleanup_proc(authctxt);
194 if (options.kerberos_or_local_passwd)
199 return (authctxt->valid ? 1 : 0);
203 krb5_cleanup_proc(Authctxt *authctxt)
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;
210 if (authctxt->krb5_user) {
211 krb5_free_principal(authctxt->krb5_ctx, authctxt->krb5_user);
212 authctxt->krb5_user = NULL;
214 if (authctxt->krb5_ctx) {
215 krb5_free_context(authctxt->krb5_ctx);
216 authctxt->krb5_ctx = NULL;
222 ssh_krb5_cc_gen(krb5_context ctx, krb5_ccache *ccache) {
227 ret = snprintf(ccname, sizeof(ccname),
228 "FILE:/tmp/krb5cc_%d_XXXXXXXXXX", geteuid());
229 if (ret < 0 || (size_t)ret >= sizeof(ccname))
232 old_umask = umask(0177);
233 tmpfd = mkstemp(ccname + strlen("FILE:"));
236 logit("mkstemp(): %.100s", strerror(errno));
240 if (fchmod(tmpfd,S_IRUSR | S_IWUSR) == -1) {
241 logit("fchmod(): %.100s", strerror(errno));
247 return (krb5_cc_resolve(ctx, ccname, ccache));
249 #endif /* !HEIMDAL */