1 /* $OpenBSD: auth-krb5.c,v 1.20 2013/07/20 01:55:13 djm Exp $ */
3 * Kerberos v5 authentication and ticket-passing routines.
5 * $FreeBSD: 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.
33 #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;
82 char *client, *platform_client;
85 /* get platform-specific kerberos client principal name (if it exists) */
86 platform_client = platform_krb5_get_principal_name(authctxt->pw->pw_name);
87 client = platform_client ? platform_client : authctxt->pw->pw_name;
89 temporarily_use_uid(authctxt->pw);
91 problem = krb5_init(authctxt);
95 problem = krb5_parse_name(authctxt->krb5_ctx, client,
96 &authctxt->krb5_user);
101 # ifdef HAVE_KRB5_CC_NEW_UNIQUE
102 problem = krb5_cc_new_unique(authctxt->krb5_ctx,
103 krb5_mcc_ops.prefix, NULL, &ccache);
105 problem = krb5_cc_gen_new(authctxt->krb5_ctx, &krb5_mcc_ops, &ccache);
110 problem = krb5_cc_initialize(authctxt->krb5_ctx, ccache,
111 authctxt->krb5_user);
117 problem = krb5_verify_user(authctxt->krb5_ctx, authctxt->krb5_user,
118 ccache, password, 1, NULL);
120 temporarily_use_uid(authctxt->pw);
125 # ifdef HAVE_KRB5_CC_NEW_UNIQUE
126 problem = krb5_cc_new_unique(authctxt->krb5_ctx,
127 krb5_fcc_ops.prefix, NULL, &authctxt->krb5_fwd_ccache);
129 problem = krb5_cc_gen_new(authctxt->krb5_ctx, &krb5_fcc_ops,
130 &authctxt->krb5_fwd_ccache);
135 problem = krb5_cc_copy_cache(authctxt->krb5_ctx, ccache,
136 authctxt->krb5_fwd_ccache);
137 krb5_cc_destroy(authctxt->krb5_ctx, ccache);
143 problem = krb5_get_init_creds_password(authctxt->krb5_ctx, &creds,
144 authctxt->krb5_user, (char *)password, NULL, NULL, 0, NULL, NULL);
148 problem = krb5_sname_to_principal(authctxt->krb5_ctx, NULL, NULL,
149 KRB5_NT_SRV_HST, &server);
154 problem = krb5_verify_init_creds(authctxt->krb5_ctx, &creds, server,
156 krb5_free_principal(authctxt->krb5_ctx, server);
157 temporarily_use_uid(authctxt->pw);
161 if (!krb5_kuserok(authctxt->krb5_ctx, authctxt->krb5_user,
162 authctxt->pw->pw_name)) {
167 problem = ssh_krb5_cc_gen(authctxt->krb5_ctx, &authctxt->krb5_fwd_ccache);
171 problem = krb5_cc_initialize(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache,
172 authctxt->krb5_user);
176 problem= krb5_cc_store_cred(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache,
182 authctxt->krb5_ticket_file = (char *)krb5_cc_get_name(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache);
184 len = strlen(authctxt->krb5_ticket_file) + 6;
185 authctxt->krb5_ccname = xmalloc(len);
186 snprintf(authctxt->krb5_ccname, len, "FILE:%s",
187 authctxt->krb5_ticket_file);
191 do_pam_putenv("KRB5CCNAME", authctxt->krb5_ccname);
197 free(platform_client);
201 krb5_cc_destroy(authctxt->krb5_ctx, ccache);
203 if (authctxt->krb5_ctx != NULL && problem!=-1) {
204 errmsg = krb5_get_error_message(authctxt->krb5_ctx,
206 debug("Kerberos password authentication failed: %s",
208 krb5_free_error_message(authctxt->krb5_ctx, errmsg);
210 debug("Kerberos password authentication failed: %d",
213 krb5_cleanup_proc(authctxt);
215 if (options.kerberos_or_local_passwd)
220 return (authctxt->valid ? 1 : 0);
224 krb5_cleanup_proc(Authctxt *authctxt)
226 debug("krb5_cleanup_proc called");
227 if (authctxt->krb5_fwd_ccache) {
228 krb5_cc_destroy(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache);
229 authctxt->krb5_fwd_ccache = NULL;
231 if (authctxt->krb5_user) {
232 krb5_free_principal(authctxt->krb5_ctx, authctxt->krb5_user);
233 authctxt->krb5_user = NULL;
235 if (authctxt->krb5_ctx) {
236 krb5_free_context(authctxt->krb5_ctx);
237 authctxt->krb5_ctx = NULL;
243 ssh_krb5_cc_gen(krb5_context ctx, krb5_ccache *ccache) {
244 int tmpfd, ret, oerrno;
248 ret = snprintf(ccname, sizeof(ccname),
249 "FILE:/tmp/krb5cc_%d_XXXXXXXXXX", geteuid());
250 if (ret < 0 || (size_t)ret >= sizeof(ccname))
253 old_umask = umask(0177);
254 tmpfd = mkstemp(ccname + strlen("FILE:"));
258 logit("mkstemp(): %.100s", strerror(oerrno));
262 if (fchmod(tmpfd,S_IRUSR | S_IWUSR) == -1) {
264 logit("fchmod(): %.100s", strerror(oerrno));
270 return (krb5_cc_resolve(ctx, ccname, ccache));
272 #endif /* !HEIMDAL */