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 1.16 2005/11/21 09:42:10 dtucker 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;
72 temporarily_use_uid(authctxt->pw);
74 problem = krb5_init(authctxt);
78 problem = krb5_parse_name(authctxt->krb5_ctx, authctxt->pw->pw_name,
79 &authctxt->krb5_user);
84 problem = krb5_cc_gen_new(authctxt->krb5_ctx, &krb5_mcc_ops, &ccache);
88 problem = krb5_cc_initialize(authctxt->krb5_ctx, ccache,
95 problem = krb5_verify_user(authctxt->krb5_ctx, authctxt->krb5_user,
96 ccache, password, 1, NULL);
98 temporarily_use_uid(authctxt->pw);
103 problem = krb5_cc_gen_new(authctxt->krb5_ctx, &krb5_fcc_ops,
104 &authctxt->krb5_fwd_ccache);
108 problem = krb5_cc_copy_cache(authctxt->krb5_ctx, ccache,
109 authctxt->krb5_fwd_ccache);
110 krb5_cc_destroy(authctxt->krb5_ctx, ccache);
116 problem = krb5_get_init_creds_password(authctxt->krb5_ctx, &creds,
117 authctxt->krb5_user, (char *)password, NULL, NULL, 0, NULL, NULL);
121 problem = krb5_sname_to_principal(authctxt->krb5_ctx, NULL, NULL,
122 KRB5_NT_SRV_HST, &server);
127 problem = krb5_verify_init_creds(authctxt->krb5_ctx, &creds, server,
129 krb5_free_principal(authctxt->krb5_ctx, server);
130 temporarily_use_uid(authctxt->pw);
134 if (!krb5_kuserok(authctxt->krb5_ctx, authctxt->krb5_user,
135 authctxt->pw->pw_name)) {
140 problem = ssh_krb5_cc_gen(authctxt->krb5_ctx, &authctxt->krb5_fwd_ccache);
144 problem = krb5_cc_initialize(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache,
145 authctxt->krb5_user);
149 problem= krb5_cc_store_cred(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache,
155 authctxt->krb5_ticket_file = (char *)krb5_cc_get_name(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache);
157 len = strlen(authctxt->krb5_ticket_file) + 6;
158 authctxt->krb5_ccname = xmalloc(len);
160 snprintf(authctxt->krb5_ccname, len, "API:%s",
161 authctxt->krb5_ticket_file);
163 snprintf(authctxt->krb5_ccname, len, "FILE:%s",
164 authctxt->krb5_ticket_file);
169 do_pam_putenv("KRB5CCNAME", authctxt->krb5_ccname);
177 krb5_cc_destroy(authctxt->krb5_ctx, ccache);
179 if (authctxt->krb5_ctx != NULL && problem!=-1)
180 debug("Kerberos password authentication failed: %s",
181 krb5_get_err_text(authctxt->krb5_ctx, problem));
183 debug("Kerberos password authentication failed: %d",
186 krb5_cleanup_proc(authctxt);
188 if (options.kerberos_or_local_passwd)
193 return (authctxt->valid ? 1 : 0);
197 krb5_cleanup_proc(Authctxt *authctxt)
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;
204 if (authctxt->krb5_user) {
205 krb5_free_principal(authctxt->krb5_ctx, authctxt->krb5_user);
206 authctxt->krb5_user = NULL;
208 if (authctxt->krb5_ctx) {
209 krb5_free_context(authctxt->krb5_ctx);
210 authctxt->krb5_ctx = NULL;
216 ssh_krb5_cc_gen(krb5_context ctx, krb5_ccache *ccache) {
221 char cctemplate[] = "API:krb5cc_%d";
223 char cctemplate[] = "FILE:/tmp/krb5cc_%d_XXXXXXXXXX";
227 ret = snprintf(ccname, sizeof(ccname),
228 cctemplate, geteuid());
229 if (ret < 0 || (size_t)ret >= sizeof(ccname))
233 old_umask = umask(0177);
234 tmpfd = mkstemp(ccname + strlen("FILE:"));
237 logit("mkstemp(): %.100s", strerror(errno));
241 if (fchmod(tmpfd,S_IRUSR | S_IWUSR) == -1) {
242 logit("fchmod(): %.100s", strerror(errno));
249 return (krb5_cc_resolve(ctx, ccname, ccache));
251 #endif /* !HEIMDAL */