2 * Kerberos v5 authentication and ticket-passing routines.
4 * $FreeBSD: src/crypto/openssh/auth-krb5.c,v 1.6 2001/02/13 16:58:04 assar Exp $
7 * Copyright (c) 2002 Daniel Kouril. All rights reserved.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
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.
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.
31 RCSID("$OpenBSD: auth-krb5.c,v 1.15 2003/11/21 11:57:02 djm Exp $");
45 extern ServerOptions options;
48 krb5_init(void *context)
50 Authctxt *authctxt = (Authctxt *)context;
51 krb5_error_code problem;
53 if (authctxt->krb5_ctx == NULL) {
54 problem = krb5_init_context(&authctxt->krb5_ctx);
62 auth_krb5_password(Authctxt *authctxt, const char *password)
66 krb5_principal server;
68 krb5_error_code problem;
69 krb5_ccache ccache = NULL;
75 temporarily_use_uid(authctxt->pw);
77 problem = krb5_init(authctxt);
81 problem = krb5_parse_name(authctxt->krb5_ctx, authctxt->pw->pw_name,
82 &authctxt->krb5_user);
87 problem = krb5_cc_gen_new(authctxt->krb5_ctx, &krb5_mcc_ops, &ccache);
91 problem = krb5_cc_initialize(authctxt->krb5_ctx, ccache,
98 problem = krb5_verify_user(authctxt->krb5_ctx, authctxt->krb5_user,
99 ccache, password, 1, NULL);
101 temporarily_use_uid(authctxt->pw);
106 problem = krb5_cc_gen_new(authctxt->krb5_ctx, &krb5_fcc_ops,
107 &authctxt->krb5_fwd_ccache);
111 problem = krb5_cc_copy_cache(authctxt->krb5_ctx, ccache,
112 authctxt->krb5_fwd_ccache);
113 krb5_cc_destroy(authctxt->krb5_ctx, ccache);
119 problem = krb5_get_init_creds_password(authctxt->krb5_ctx, &creds,
120 authctxt->krb5_user, (char *)password, NULL, NULL, 0, NULL, NULL);
124 problem = krb5_sname_to_principal(authctxt->krb5_ctx, NULL, NULL,
125 KRB5_NT_SRV_HST, &server);
130 problem = krb5_verify_init_creds(authctxt->krb5_ctx, &creds, server,
132 krb5_free_principal(authctxt->krb5_ctx, server);
133 temporarily_use_uid(authctxt->pw);
137 if (!krb5_kuserok(authctxt->krb5_ctx, authctxt->krb5_user,
138 authctxt->pw->pw_name)) {
143 problem = ssh_krb5_cc_gen(authctxt->krb5_ctx, &authctxt->krb5_fwd_ccache);
147 problem = krb5_cc_initialize(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache,
148 authctxt->krb5_user);
152 problem= krb5_cc_store_cred(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache,
158 authctxt->krb5_ticket_file = (char *)krb5_cc_get_name(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache);
160 len = strlen(authctxt->krb5_ticket_file) + 6;
161 authctxt->krb5_ccname = xmalloc(len);
162 snprintf(authctxt->krb5_ccname, len, "FILE:%s",
163 authctxt->krb5_ticket_file);
167 do_pam_putenv("KRB5CCNAME", authctxt->krb5_ccname);
175 krb5_cc_destroy(authctxt->krb5_ctx, ccache);
177 if (authctxt->krb5_ctx != NULL && problem!=-1)
178 debug("Kerberos password authentication failed: %s",
179 krb5_get_err_text(authctxt->krb5_ctx, problem));
181 debug("Kerberos password authentication failed: %d",
184 krb5_cleanup_proc(authctxt);
186 if (options.kerberos_or_local_passwd)
195 krb5_cleanup_proc(Authctxt *authctxt)
197 debug("krb5_cleanup_proc called");
198 if (authctxt->krb5_fwd_ccache) {
199 krb5_cc_destroy(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache);
200 authctxt->krb5_fwd_ccache = NULL;
202 if (authctxt->krb5_user) {
203 krb5_free_principal(authctxt->krb5_ctx, authctxt->krb5_user);
204 authctxt->krb5_user = NULL;
206 if (authctxt->krb5_ctx) {
207 krb5_free_context(authctxt->krb5_ctx);
208 authctxt->krb5_ctx = NULL;
214 ssh_krb5_cc_gen(krb5_context ctx, krb5_ccache *ccache) {
219 ret = snprintf(ccname, sizeof(ccname),
220 "FILE:/tmp/krb5cc_%d_XXXXXXXXXX", geteuid());
221 if (ret == -1 || ret >= sizeof(ccname))
224 old_umask = umask(0177);
225 tmpfd = mkstemp(ccname + strlen("FILE:"));
228 logit("mkstemp(): %.100s", strerror(errno));
232 if (fchmod(tmpfd,S_IRUSR | S_IWUSR) == -1) {
233 logit("fchmod(): %.100s", strerror(errno));
239 return (krb5_cc_resolve(ctx, ccname, ccache));
241 #endif /* !HEIMDAL */