+/* $OpenBSD: auth-krb5.c,v 1.19 2006/08/03 03:34:41 deraadt Exp $ */
/*
* 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 1.5 2002/02/15 23:54:10 markus 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"
+
+#include <sys/types.h>
+#include <pwd.h>
+#include <stdarg.h>
+
+#include "xmalloc.h"
#include "ssh.h"
#include "ssh1.h"
#include "packet.h"
-#include "xmalloc.h"
#include "log.h"
+#include "buffer.h"
#include "servconf.h"
#include "uidswap.h"
+#include "key.h"
+#include "hostfile.h"
#include "auth.h"
#ifdef KRB5
+#include <errno.h>
+#include <unistd.h>
+#include <string.h>
#include <krb5.h>
extern ServerOptions options;
{
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)
return (problem);
- krb5_init_ets(authctxt->krb5_ctx);
- }
- if (!cleanup_registered) {
- fatal_add_cleanup(krb5_cleanup_proc, authctxt);
- cleanup_registered = 1;
}
return (0);
}
-/*
- * Try krb5 authentication. server_user is passed for logging purposes
- * only, in auth is received ticket, in client is returned principal
- * from the ticket
- */
int
-auth_krb5(Authctxt *authctxt, krb5_data *auth, char **client)
+auth_krb5_password(Authctxt *authctxt, const char *password)
{
- krb5_error_code problem;
+#ifndef HEIMDAL
+ krb5_creds creds;
krb5_principal server;
- krb5_data reply;
- krb5_ticket *ticket;
- int fd, ret;
-
- ret = 0;
- server = NULL;
- ticket = NULL;
- reply.length = 0;
-
- problem = krb5_init(authctxt);
- if (problem)
- goto err;
+#endif
+ krb5_error_code problem;
+ krb5_ccache ccache = NULL;
+ int len;
+ char *client, *platform_client;
- problem = krb5_auth_con_init(authctxt->krb5_ctx,
- &authctxt->krb5_auth_ctx);
- if (problem)
- goto err;
+ /* get platform-specific kerberos client principal name (if it exists) */
+ platform_client = platform_krb5_get_principal_name(authctxt->pw->pw_name);
+ client = platform_client ? platform_client : authctxt->pw->pw_name;
- fd = packet_get_connection_in();
- problem = krb5_auth_con_setaddrs_from_fd(authctxt->krb5_ctx,
- authctxt->krb5_auth_ctx, &fd);
- if (problem)
- goto err;
+ temporarily_use_uid(authctxt->pw);
- problem = krb5_sname_to_principal(authctxt->krb5_ctx, NULL, NULL ,
- KRB5_NT_SRV_HST, &server);
+ problem = krb5_init(authctxt);
if (problem)
- goto err;
+ goto out;
- problem = krb5_rd_req(authctxt->krb5_ctx, &authctxt->krb5_auth_ctx,
- auth, server, NULL, NULL, &ticket);
+ problem = krb5_parse_name(authctxt->krb5_ctx, client,
+ &authctxt->krb5_user);
if (problem)
- goto err;
+ goto out;
- problem = krb5_copy_principal(authctxt->krb5_ctx, ticket->client,
- &authctxt->krb5_user);
+#ifdef HEIMDAL
+ problem = krb5_cc_gen_new(authctxt->krb5_ctx, &krb5_mcc_ops, &ccache);
if (problem)
- goto err;
+ goto out;
- /* if client wants mutual auth */
- problem = krb5_mk_rep(authctxt->krb5_ctx, authctxt->krb5_auth_ctx,
- &reply);
+ problem = krb5_cc_initialize(authctxt->krb5_ctx, ccache,
+ authctxt->krb5_user);
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:
- if (server)
- krb5_free_principal(authctxt->krb5_ctx, server);
- if (ticket)
- krb5_free_ticket(authctxt->krb5_ctx, ticket);
- if (reply.length)
- xfree(reply.data);
-
- 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);
-}
+ goto out;
-int
-auth_krb5_tgt(Authctxt *authctxt, krb5_data *tgt)
-{
- krb5_error_code problem;
- krb5_ccache ccache = NULL;
- char *pname;
+ restore_uid();
- if (authctxt->pw == NULL || authctxt->krb5_user == NULL)
- return (0);
+ problem = krb5_verify_user(authctxt->krb5_ctx, authctxt->krb5_user,
+ ccache, password, 1, NULL);
temporarily_use_uid(authctxt->pw);
- problem = krb5_cc_gen_new(authctxt->krb5_ctx, &krb5_fcc_ops, &ccache);
- if (problem)
- goto fail;
-
- problem = krb5_cc_initialize(authctxt->krb5_ctx, ccache,
- authctxt->krb5_user);
if (problem)
- goto fail;
+ goto out;
- problem = krb5_rd_cred2(authctxt->krb5_ctx, authctxt->krb5_auth_ctx,
- ccache, tgt);
+ problem = krb5_cc_gen_new(authctxt->krb5_ctx, &krb5_fcc_ops,
+ &authctxt->krb5_fwd_ccache);
if (problem)
- goto fail;
+ goto out;
- authctxt->krb5_fwd_ccache = ccache;
+ problem = krb5_cc_copy_cache(authctxt->krb5_ctx, ccache,
+ authctxt->krb5_fwd_ccache);
+ krb5_cc_destroy(authctxt->krb5_ctx, 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();
+ goto out;
- return (1);
+#else
+ problem = krb5_get_init_creds_password(authctxt->krb5_ctx, &creds,
+ authctxt->krb5_user, (char *)password, NULL, NULL, 0, NULL, NULL);
+ if (problem)
+ goto out;
- fail:
+ problem = krb5_sname_to_principal(authctxt->krb5_ctx, NULL, NULL,
+ KRB5_NT_SRV_HST, &server);
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);
+ goto out;
restore_uid();
-
- return (0);
-}
-
-int
-auth_krb5_password(Authctxt *authctxt, const char *password)
-{
- krb5_error_code problem;
-
- if (authctxt->pw == NULL)
- return (0);
-
+ 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);
-
- problem = krb5_init(authctxt);
if (problem)
goto out;
- problem = krb5_parse_name(authctxt->krb5_ctx, authctxt->pw->pw_name,
- &authctxt->krb5_user);
- if (problem)
+ if (!krb5_kuserok(authctxt->krb5_ctx, authctxt->krb5_user, client)) {
+ problem = -1;
goto out;
+ }
- problem = krb5_cc_gen_new(authctxt->krb5_ctx, &krb5_mcc_ops,
- &authctxt->krb5_fwd_ccache);
+ problem = ssh_krb5_cc_gen(authctxt->krb5_ctx, &authctxt->krb5_fwd_ccache);
if (problem)
goto out;
- problem = krb5_cc_initialize(authctxt->krb5_ctx,
- authctxt->krb5_fwd_ccache, authctxt->krb5_user);
+ problem = krb5_cc_initialize(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache,
+ authctxt->krb5_user);
if (problem)
goto out;
- restore_uid();
- problem = krb5_verify_user(authctxt->krb5_ctx, authctxt->krb5_user,
- authctxt->krb5_fwd_ccache, password, 1, NULL);
- temporarily_use_uid(authctxt->pw);
-
+ 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);
+ len = strlen(authctxt->krb5_ticket_file) + 6;
+ authctxt->krb5_ccname = xmalloc(len);
+ snprintf(authctxt->krb5_ccname, len, "FILE:%s",
+ authctxt->krb5_ticket_file);
+
+#ifdef USE_PAM
+ if (options.use_pam)
+ do_pam_putenv("KRB5CCNAME", authctxt->krb5_ccname);
+#endif
+
out:
restore_uid();
+
+ if (platform_client != NULL)
+ xfree(platform_client);
if (problem) {
- if (authctxt->krb5_ctx != NULL)
+ if (ccache)
+ krb5_cc_destroy(authctxt->krb5_ctx, ccache);
+
+ if (authctxt->krb5_ctx != NULL && problem!=-1)
debug("Kerberos password authentication failed: %s",
krb5_get_err_text(authctxt->krb5_ctx, problem));
else
else
return (0);
}
- return (1);
+ return (authctxt->valid ? 1 : 0);
}
void
-krb5_cleanup_proc(void *context)
+krb5_cleanup_proc(Authctxt *authctxt)
{
- Authctxt *authctxt = (Authctxt *)context;
-
debug("krb5_cleanup_proc called");
if (authctxt->krb5_fwd_ccache) {
krb5_cc_destroy(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache);
krb5_free_principal(authctxt->krb5_ctx, authctxt->krb5_user);
authctxt->krb5_user = NULL;
}
- if (authctxt->krb5_auth_ctx) {
- krb5_auth_con_free(authctxt->krb5_ctx,
- authctxt->krb5_auth_ctx);
- authctxt->krb5_auth_ctx = NULL;
- }
if (authctxt->krb5_ctx) {
krb5_free_context(authctxt->krb5_ctx);
authctxt->krb5_ctx = NULL;
}
}
+#ifndef HEIMDAL
+krb5_error_code
+ssh_krb5_cc_gen(krb5_context ctx, krb5_ccache *ccache) {
+ int tmpfd, ret;
+ char ccname[40];
+ mode_t old_umask;
+
+ ret = snprintf(ccname, sizeof(ccname),
+ "FILE:/tmp/krb5cc_%d_XXXXXXXXXX", geteuid());
+ if (ret < 0 || (size_t)ret >= sizeof(ccname))
+ return ENOMEM;
+
+ old_umask = umask(0177);
+ tmpfd = mkstemp(ccname + strlen("FILE:"));
+ umask(old_umask);
+ if (tmpfd == -1) {
+ logit("mkstemp(): %.100s", strerror(errno));
+ return errno;
+ }
+
+ if (fchmod(tmpfd,S_IRUSR | S_IWUSR) == -1) {
+ logit("fchmod(): %.100s", strerror(errno));
+ close(tmpfd);
+ return errno;
+ }
+ close(tmpfd);
+
+ return (krb5_cc_resolve(ctx, ccname, ccache));
+}
+#endif /* !HEIMDAL */
#endif /* KRB5 */
andersk / openssh.git / blobdiff