/*
* Kerberos v5 authentication and ticket-passing routines.
- *
+ *
* $FreeBSD: src/crypto/openssh/auth-krb5.c,v 1.6 2001/02/13 16:58:04 assar Exp $
- * $OpenBSD: auth-krb5.c,v 1.2 2001/11/12 01:47:09 dugsong Exp $
+ */
+/*
+ * Copyright (c) 2002 Daniel Kouril. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "includes.h"
+RCSID("$OpenBSD: auth-krb5.c,v 1.10 2002/11/21 23:03:51 deraadt Exp $");
+
#include "ssh.h"
#include "ssh1.h"
#include "packet.h"
Authctxt *authctxt = (Authctxt *)context;
krb5_error_code problem;
static int cleanup_registered = 0;
-
+
if (authctxt->krb5_ctx == NULL) {
problem = krb5_init_context(&authctxt->krb5_ctx);
if (problem)
* only, in auth is received ticket, in client is returned principal
* from the ticket
*/
-int
-auth_krb5(Authctxt *authctxt, krb5_data *auth, char **client)
+int
+auth_krb5(Authctxt *authctxt, krb5_data *auth, char **client, krb5_data *reply)
{
krb5_error_code problem;
krb5_principal server;
- krb5_data reply;
krb5_ticket *ticket;
int fd, ret;
ret = 0;
server = NULL;
ticket = NULL;
- reply.length = 0;
-
+ reply->length = 0;
+
problem = krb5_init(authctxt);
- if (problem)
+ if (problem)
goto err;
-
+
problem = krb5_auth_con_init(authctxt->krb5_ctx,
&authctxt->krb5_auth_ctx);
if (problem)
goto err;
-
+
fd = packet_get_connection_in();
#ifdef HEIMDAL
problem = krb5_auth_con_setaddrs_from_fd(authctxt->krb5_ctx,
#endif
if (problem)
goto err;
-
- problem = krb5_sname_to_principal(authctxt->krb5_ctx, NULL, NULL ,
+
+ problem = krb5_sname_to_principal(authctxt->krb5_ctx, NULL, NULL,
KRB5_NT_SRV_HST, &server);
if (problem)
goto err;
-
+
problem = krb5_rd_req(authctxt->krb5_ctx, &authctxt->krb5_auth_ctx,
auth, server, NULL, NULL, &ticket);
if (problem)
goto err;
-
-#ifdef HEIMDAL
+
+#ifdef HEIMDAL
problem = krb5_copy_principal(authctxt->krb5_ctx, ticket->client,
&authctxt->krb5_user);
#else
- problem = krb5_copy_principal(authctxt->krb5_ctx, ticket->enc_part2->client,
- &authctxt->krb5_user);
+ problem = krb5_copy_principal(authctxt->krb5_ctx,
+ ticket->enc_part2->client,
+ &authctxt->krb5_user);
#endif
if (problem)
goto err;
-
+
/* if client wants mutual auth */
problem = krb5_mk_rep(authctxt->krb5_ctx, authctxt->krb5_auth_ctx,
- &reply);
+ reply);
if (problem)
goto err;
-
+
/* Check .k5login authorization now. */
if (!krb5_kuserok(authctxt->krb5_ctx, authctxt->krb5_user,
authctxt->pw->pw_name))
goto err;
-
+
if (client)
krb5_unparse_name(authctxt->krb5_ctx, authctxt->krb5_user,
client);
-
- packet_start(SSH_SMSG_AUTH_KERBEROS_RESPONSE);
- packet_put_string((char *) reply.data, reply.length);
- packet_send();
- packet_write_wait();
ret = 1;
err:
krb5_free_principal(authctxt->krb5_ctx, server);
if (ticket)
krb5_free_ticket(authctxt->krb5_ctx, ticket);
- if (reply.length)
- xfree(reply.data);
-
- if (problem)
- debug("Kerberos v5 authentication failed: %s",
- krb5_get_err_text(authctxt->krb5_ctx, problem));
+ if (!ret && reply->length) {
+ xfree(reply->data);
+ memset(reply, 0, sizeof(*reply));
+ }
+
+ if (problem) {
+ if (authctxt->krb5_ctx != NULL)
+ debug("Kerberos v5 authentication failed: %s",
+ krb5_get_err_text(authctxt->krb5_ctx, problem));
+ else
+ debug("Kerberos v5 authentication failed: %d",
+ problem);
+ }
return (ret);
}
krb5_ccache ccache = NULL;
char *pname;
krb5_creds **creds;
-
+
if (authctxt->pw == NULL || authctxt->krb5_user == NULL)
return (0);
-
+
temporarily_use_uid(authctxt->pw);
-
-#ifdef HEIMDAL
+
+#ifdef HEIMDAL
problem = krb5_cc_gen_new(authctxt->krb5_ctx, &krb5_fcc_ops, &ccache);
#else
{
- char ccname[35];
+ char ccname[40];
+ int tmpfd;
+
+ snprintf(ccname,sizeof(ccname),"FILE:/tmp/krb5cc_%d_XXXXXX",geteuid());
- snprintf(ccname, sizeof(ccname), "FILE:/tmp/krb5cc_%d", authctxt->pw->pw_uid);
+ if ((tmpfd = mkstemp(ccname+strlen("FILE:")))==-1) {
+ log("mkstemp(): %.100s", strerror(errno));
+ problem = errno;
+ goto fail;
+ }
+ if (fchmod(tmpfd,S_IRUSR | S_IWUSR) == -1) {
+ log("fchmod(): %.100s", strerror(errno));
+ close(tmpfd);
+ problem = errno;
+ goto fail;
+ }
+ close(tmpfd);
problem = krb5_cc_resolve(authctxt->krb5_ctx, ccname, &ccache);
}
#endif
if (problem)
goto fail;
-
+
problem = krb5_cc_initialize(authctxt->krb5_ctx, ccache,
authctxt->krb5_user);
if (problem)
goto fail;
-
-#ifdef HEIMDAL
+
+#ifdef HEIMDAL
problem = krb5_rd_cred2(authctxt->krb5_ctx, authctxt->krb5_auth_ctx,
ccache, tgt);
if (problem)
#else
problem = krb5_rd_cred(authctxt->krb5_ctx, authctxt->krb5_auth_ctx,
tgt, &creds, NULL);
- if (problem)
+ if (problem)
goto fail;
problem = krb5_cc_store_cred(authctxt->krb5_ctx, ccache, *creds);
if (problem)
- goto fail;
+ goto fail;
#endif
-
+
authctxt->krb5_fwd_ccache = ccache;
ccache = NULL;
-
+
authctxt->krb5_ticket_file = (char *)krb5_cc_get_name(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache);
-
+
problem = krb5_unparse_name(authctxt->krb5_ctx, authctxt->krb5_user,
&pname);
if (problem)
goto fail;
-
+
debug("Kerberos v5 TGT accepted (%s)", pname);
-
+
restore_uid();
-
+
return (1);
-
+
fail:
if (problem)
debug("Kerberos v5 TGT passing failed: %s",
krb5_get_err_text(authctxt->krb5_ctx, problem));
if (ccache)
krb5_cc_destroy(authctxt->krb5_ctx, ccache);
-
+
restore_uid();
-
+
return (0);
}
auth_krb5_password(Authctxt *authctxt, const char *password)
{
#ifndef HEIMDAL
- krb5_creds creds;
+ krb5_creds creds;
krb5_principal server;
+ char ccname[40];
+ int tmpfd;
#endif
krb5_error_code problem;
-
+
if (authctxt->pw == NULL)
return (0);
-
+
temporarily_use_uid(authctxt->pw);
-
+
problem = krb5_init(authctxt);
if (problem)
goto out;
-
+
problem = krb5_parse_name(authctxt->krb5_ctx, authctxt->pw->pw_name,
&authctxt->krb5_user);
if (problem)
goto out;
-
-#ifdef HEIMDAL
+
+#ifdef HEIMDAL
problem = krb5_cc_gen_new(authctxt->krb5_ctx, &krb5_mcc_ops,
&authctxt->krb5_fwd_ccache);
-#else
- problem = krb5_cc_resolve(authctxt->krb5_ctx, "MEMORY:",
- &authctxt->krb5_fwd_ccache);
-#endif
if (problem)
goto out;
-
+
problem = krb5_cc_initialize(authctxt->krb5_ctx,
authctxt->krb5_fwd_ccache, authctxt->krb5_user);
if (problem)
goto out;
-
-#ifdef HEIMDAL
+
+ restore_uid();
problem = krb5_verify_user(authctxt->krb5_ctx, authctxt->krb5_user,
authctxt->krb5_fwd_ccache, password, 1, NULL);
+ temporarily_use_uid(authctxt->pw);
+
if (problem)
goto out;
-
+
#else
- problem = krb5_get_init_creds_password(authctxt->krb5_ctx, &creds,
- authctxt->krb5_user, password, NULL, NULL, 0, NULL, NULL);
- if (problem)
- goto out;
+ problem = krb5_get_init_creds_password(authctxt->krb5_ctx, &creds,
+ authctxt->krb5_user, (char *)password, NULL, NULL, 0, NULL, NULL);
+ if (problem)
+ goto out;
- problem = krb5_sname_to_principal(authctxt->krb5_ctx, NULL, NULL,
- KRB5_NT_SRV_HST, &server);
- if (problem)
- goto out;
+ problem = krb5_sname_to_principal(authctxt->krb5_ctx, NULL, NULL,
+ KRB5_NT_SRV_HST, &server);
+ if (problem)
+ goto out;
restore_uid();
- problem = krb5_verify_init_creds(authctxt->krb5_ctx, &creds, server, NULL, NULL,
- NULL);
+ problem = krb5_verify_init_creds(authctxt->krb5_ctx, &creds, server,
+ NULL, NULL, NULL);
+ krb5_free_principal(authctxt->krb5_ctx, server);
temporarily_use_uid(authctxt->pw);
+ if (problem)
+ goto out;
- krb5_free_principal(authctxt->krb5_ctx, server);
- if (problem)
- goto out;
+ if (!krb5_kuserok(authctxt->krb5_ctx, authctxt->krb5_user,
+ authctxt->pw->pw_name)) {
+ problem = -1;
+ goto out;
+ }
- problem = krb5_cc_store_cred(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache, &creds);
+ snprintf(ccname,sizeof(ccname),"FILE:/tmp/krb5cc_%d_XXXXXX",geteuid());
+
+ if ((tmpfd = mkstemp(ccname+strlen("FILE:")))==-1) {
+ log("mkstemp(): %.100s", strerror(errno));
+ problem = errno;
+ goto out;
+ }
+
+ if (fchmod(tmpfd,S_IRUSR | S_IWUSR) == -1) {
+ log("fchmod(): %.100s", strerror(errno));
+ close(tmpfd);
+ problem = errno;
+ goto out;
+ }
+ close(tmpfd);
+
+ problem = krb5_cc_resolve(authctxt->krb5_ctx, ccname, &authctxt->krb5_fwd_ccache);
if (problem)
goto out;
-#endif /* HEIMDAL */
+ problem = krb5_cc_initialize(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache,
+ authctxt->krb5_user);
+ if (problem)
+ goto out;
+
+ problem= krb5_cc_store_cred(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache,
+ &creds);
+ if (problem)
+ goto out;
+#endif
authctxt->krb5_ticket_file = (char *)krb5_cc_get_name(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache);
-
+
out:
restore_uid();
-
+
if (problem) {
- debug("Kerberos password authentication failed: %s",
- krb5_get_err_text(authctxt->krb5_ctx, problem));
-
+ if (authctxt->krb5_ctx != NULL && problem!=-1)
+ debug("Kerberos password authentication failed: %s",
+ krb5_get_err_text(authctxt->krb5_ctx, problem));
+ else
+ debug("Kerberos password authentication failed: %d",
+ problem);
+
krb5_cleanup_proc(authctxt);
-
+
if (options.kerberos_or_local_passwd)
return (-1);
else
krb5_cleanup_proc(void *context)
{
Authctxt *authctxt = (Authctxt *)context;
-
+
debug("krb5_cleanup_proc called");
if (authctxt->krb5_fwd_ccache) {
krb5_cc_destroy(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache);
andersk / gssapi-openssh.git / blobdiff