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authorRemi Collet <fedora@famillecollet.com>2012-06-13 18:43:31 +0200
committerRemi Collet <fedora@famillecollet.com>2012-06-13 18:43:31 +0200
commit6a0492dd00a3ca23503e3aeafdb686c937adecb9 (patch)
tree716c90a275d377b387f6fe24832a3e99153ad792 /mod_auth_kerb-5.4-s4u2proxy.patch
reorg repo
Diffstat (limited to 'mod_auth_kerb-5.4-s4u2proxy.patch')
-rw-r--r--mod_auth_kerb-5.4-s4u2proxy.patch571
1 files changed, 571 insertions, 0 deletions
diff --git a/mod_auth_kerb-5.4-s4u2proxy.patch b/mod_auth_kerb-5.4-s4u2proxy.patch
new file mode 100644
index 0000000..23185f3
--- /dev/null
+++ b/mod_auth_kerb-5.4-s4u2proxy.patch
@@ -0,0 +1,571 @@
+diff -up --recursive mod_auth_kerb-5.4.orig/README mod_auth_kerb-5.4/README
+--- mod_auth_kerb-5.4.orig/README 2008-11-26 11:51:05.000000000 -0500
++++ mod_auth_kerb-5.4/README 2012-01-04 11:17:22.000000000 -0500
+@@ -122,4 +122,16 @@ KrbSaveCredentials, the tickets will be
+ credential cache that will be available for the request handler. The ticket
+ file will be removed after request is handled.
+
++Constrained Delegation
++----------------------
++S4U2Proxy, or constrained delegation, enables a service to use a client's
++ticket to itself to request another ticket for delegation. The KDC
++checks krbAllowedToDelegateTo to decide if it will issue a new ticket.
++If KrbConstrainedDelegation is enabled the server will use its own credentials
++to retrieve a delegated ticket for the user. For this to work the user must
++have a forwardable ticket (though the delegation flag need not be set).
++The server needs a valid credentials cache for this to work.
++
++The module itself will obtain and manage the necessary credentials.
++
+ $Id: README,v 1.12 2008/09/17 14:01:55 baalberith Exp $
+diff -up --recursive mod_auth_kerb-5.4.orig/src/mod_auth_kerb.c mod_auth_kerb-5.4/src/mod_auth_kerb.c
+--- mod_auth_kerb-5.4.orig/src/mod_auth_kerb.c 2011-12-09 17:55:05.000000000 -0500
++++ mod_auth_kerb-5.4/src/mod_auth_kerb.c 2012-03-01 14:19:40.000000000 -0500
+@@ -42,6 +42,31 @@
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
++/*
++ * Locking mechanism inspired by mod_rewrite.
++ *
++ * Licensed to the Apache Software Foundation (ASF) under one or more
++ * contributor license agreements. See the NOTICE file distributed with
++ * this work for additional information regarding copyright ownership.
++ * The ASF licenses this file to You under the Apache License, Version 2.0
++ * (the "License"); you may not use this file except in compliance with
++ * the License. You may obtain a copy of the License at
++ *
++ * http://www.apache.org/licenses/LICENSE-2.0
++ *
++ * Unless required by applicable law or agreed to in writing, software
++ * distributed under the License is distributed on an "AS IS" BASIS,
++ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
++ * See the License for the specific language governing permissions and
++ * limitations under the License.
++ */
++
++/*
++ * S4U2Proxy code
++ *
++ * Copyright (C) 2012 Red Hat
++ */
++
+ #ident "$Id: mod_auth_kerb.c,v 1.150 2008/12/04 10:14:03 baalberith Exp $"
+
+ #include "config.h"
+@@ -49,6 +74,7 @@
+ #include <stdlib.h>
+ #include <stdio.h>
+ #include <stdarg.h>
++#include <unixd.h>
+
+ #define MODAUTHKERB_VERSION "5.4"
+
+@@ -131,6 +157,12 @@ module AP_MODULE_DECLARE_DATA auth_kerb_
+ module auth_kerb_module;
+ #endif
+
++#ifdef STANDARD20_MODULE_STUFF
++/* s4u2proxy only supported in 2.0+ */
++static const char *lockname;
++static apr_global_mutex_t *s4u2proxy_lock = NULL;
++#endif
++
+ /***************************************************************************
+ Macros To Ease Compatibility
+ ***************************************************************************/
+@@ -165,6 +197,7 @@ typedef struct {
+ int krb_method_gssapi;
+ int krb_method_k5pass;
+ int krb5_do_auth_to_local;
++ int krb5_s4u2proxy;
+ #endif
+ #ifdef KRB4
+ char *krb_4_srvtab;
+@@ -185,6 +218,11 @@ set_kerb_auth_headers(request_rec *r, co
+
+ static const char*
+ krb5_save_realms(cmd_parms *cmd, void *sec, const char *arg);
++static const char *
++cmd_delegationlock(cmd_parms *cmd, void *dconf, const char *a1);
++
++static int
++obtain_server_credentials(request_rec *r, const char *service_name);
+
+ #ifdef STANDARD20_MODULE_STUFF
+ #define command(name, func, var, type, usage) \
+@@ -237,6 +275,12 @@ static const command_rec kerb_auth_cmds[
+
+ command("KrbLocalUserMapping", ap_set_flag_slot, krb5_do_auth_to_local,
+ FLAG, "Set to 'on' to have Kerberos do auth_to_local mapping of principal names to system user names."),
++
++ command("KrbConstrainedDelegation", ap_set_flag_slot, krb5_s4u2proxy,
++ FLAG, "Set to 'on' to have Kerberos use S4U2Proxy delegation."),
++
++ AP_INIT_TAKE1("KrbConstrainedDelegationLock", cmd_delegationlock, NULL,
++ RSRC_CONF, "the filename of a lockfile used for inter-process synchronization"),
+ #endif
+
+ #ifdef KRB4
+@@ -302,6 +346,7 @@ static void *kerb_dir_create_config(MK_P
+ #endif
+ #ifdef KRB5
+ ((kerb_auth_config *)rec)->krb5_do_auth_to_local = 0;
++ ((kerb_auth_config *)rec)->krb5_s4u2proxy = 0;
+ ((kerb_auth_config *)rec)->krb_method_k5pass = 1;
+ ((kerb_auth_config *)rec)->krb_method_gssapi = 1;
+ #endif
+@@ -319,6 +364,24 @@ krb5_save_realms(cmd_parms *cmd, void *v
+ return NULL;
+ }
+
++static const char *
++cmd_delegationlock(cmd_parms *cmd, void *dconf, const char *a1)
++{
++ const char *error;
++
++ if ((error = ap_check_cmd_context(cmd, GLOBAL_ONLY)) != NULL)
++ return error;
++
++ /* fixup the path, especially for s4u2proxylock_remove() */
++ lockname = ap_server_root_relative(cmd->pool, a1);
++
++ if (!lockname) {
++ return apr_pstrcat(cmd->pool, "Invalid KrbConstrainedDelegationLock path ", a1, NULL);
++ }
++
++ return NULL;
++}
++
+ static void
+ log_rerror(const char *file, int line, int level, int status,
+ const request_rec *r, const char *fmt, ...)
+@@ -1170,6 +1233,7 @@ get_gss_creds(request_rec *r,
+ gss_buffer_desc token = GSS_C_EMPTY_BUFFER;
+ OM_uint32 major_status, minor_status, minor_status2;
+ gss_name_t server_name = GSS_C_NO_NAME;
++ gss_cred_usage_t usage = GSS_C_ACCEPT;
+ char buf[1024];
+ int have_server_princ;
+
+@@ -1212,10 +1276,14 @@ get_gss_creds(request_rec *r,
+
+ log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, "Acquiring creds for %s",
+ token.value);
++ if (conf->krb5_s4u2proxy) {
++ usage = GSS_C_BOTH;
++ obtain_server_credentials(r, conf->krb_service_name);
++ }
+ gss_release_buffer(&minor_status, &token);
+
+ major_status = gss_acquire_cred(&minor_status, server_name, GSS_C_INDEFINITE,
+- GSS_C_NO_OID_SET, GSS_C_ACCEPT,
++ GSS_C_NO_OID_SET, usage,
+ server_creds, NULL, NULL);
+ gss_release_name(&minor_status2, &server_name);
+ if (GSS_ERROR(major_status)) {
+@@ -1257,6 +1325,293 @@ cmp_gss_type(gss_buffer_t token, gss_OID
+ }
+ #endif
+
++/* Renew the ticket if it will expire in under a minute */
++#define RENEWAL_TIME 60
++
++/*
++ * Services4U2Proxy lets a server prinicipal request another service
++ * principal on behalf of a user. To do this the Apache service needs
++ * to have its own ccache. This will ensure that the ccache has a valid
++ * principal and will initialize or renew new credentials when needed.
++ */
++
++static int
++verify_server_credentials(request_rec *r,
++ krb5_context kcontext,
++ krb5_ccache ccache,
++ krb5_principal princ,
++ int *renew
++)
++{
++ krb5_creds match_cred;
++ krb5_creds creds;
++ char * princ_name = NULL;
++ char *tgs_princ_name = NULL;
++ krb5_timestamp now;
++ krb5_error_code kerr = 0;
++
++ *renew = 0;
++
++ memset (&match_cred, 0, sizeof(match_cred));
++ memset (&creds, 0, sizeof(creds));
++
++ if (NULL == ccache || NULL == princ) {
++ /* Nothing to verify */
++ *renew = 1;
++ goto cleanup;
++ }
++
++ if ((kerr = krb5_unparse_name(kcontext, princ, &princ_name))) {
++ log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
++ "Could not unparse principal %s (%d)",
++ error_message(kerr), kerr);
++ goto cleanup;
++ }
++
++ log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
++ "Using principal %s for s4u2proxy", princ_name);
++
++ tgs_princ_name = apr_psprintf(r->pool, "%s/%.*s@%.*s", KRB5_TGS_NAME,
++ krb5_princ_realm(kcontext, princ)->length,
++ krb5_princ_realm(kcontext, princ)->data,
++ krb5_princ_realm(kcontext, princ)->length,
++ krb5_princ_realm(kcontext, princ)->data);
++
++ if ((kerr = krb5_parse_name(kcontext, tgs_princ_name, &match_cred.server)))
++ {
++ log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
++ "Could not parse principal %s: %s (%d)",
++ tgs_princ_name, error_message(kerr), kerr);
++ goto cleanup;
++ }
++
++ match_cred.client = princ;
++
++ if ((kerr = krb5_cc_retrieve_cred(kcontext, ccache, 0, &match_cred, &creds)))
++ {
++ krb5_unparse_name(kcontext, princ, &princ_name);
++ log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
++ "Could not unparse principal %s: %s (%d)",
++ princ_name, error_message(kerr), kerr);
++ goto cleanup;
++ }
++
++ if ((kerr = krb5_timeofday(kcontext, &now))) {
++ log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
++ "Could not get current time: %d (%s)",
++ kerr, error_message(kerr));
++ goto cleanup;
++ }
++
++ if (now > (creds.times.endtime + RENEWAL_TIME)) {
++ log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
++ "Credentials for %s have expired or will soon "
++ "expire - now %d endtime %d",
++ princ_name, now, creds.times.endtime);
++ *renew = 1;
++ } else {
++ log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
++ "Credentials for %s will expire at "
++ "%d, it is now %d", princ_name, creds.times.endtime, now);
++ }
++
++cleanup:
++ /* Closing context, ccache, etc happens elsewhere */
++ if (match_cred.server) {
++ krb5_free_principal(kcontext, match_cred.server);
++ }
++ if (creds.client) {
++ krb5_free_cred_contents(kcontext, &creds);
++ }
++
++ return kerr;
++}
++
++static int
++obtain_server_credentials(request_rec *r,
++ const char *service_name)
++{
++ krb5_context kcontext = NULL;
++ krb5_keytab keytab = NULL;
++ krb5_ccache ccache = NULL;
++ char * princ_name = NULL;
++ char *tgs_princ_name = NULL;
++ krb5_error_code kerr = 0;
++ krb5_principal princ = NULL;
++ krb5_creds creds;
++ krb5_get_init_creds_opt gicopts;
++ int renew = 0;
++ apr_status_t rv = 0;
++
++ memset(&creds, 0, sizeof(creds));
++
++ if ((kerr = krb5_init_context(&kcontext))) {
++ log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
++ "Kerberos context initialization failed: %s (%d)", error_message(kerr), kerr);
++ goto done;
++ }
++
++ if ((kerr = krb5_cc_default(kcontext, &ccache))) {
++ log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
++ "Could not get default Kerberos ccache: %s (%d)",
++ error_message(kerr), kerr);
++ goto done;
++ }
++
++ if ((kerr = krb5_cc_get_principal(kcontext, ccache, &princ))) {
++ char * name = NULL;
++
++ if ((asprintf(&name, "%s:%s", krb5_cc_get_type(kcontext, ccache),
++ krb5_cc_get_name(kcontext, ccache))) == -1) {
++ kerr = KRB5_CC_NOMEM;
++ goto done;
++ }
++
++ if (KRB5_FCC_NOFILE == kerr) {
++ log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
++ "Credentials cache %s not found, create one", name);
++ krb5_cc_close(kcontext, ccache);
++ ccache = NULL;
++ free(name);
++ } else {
++ log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
++ "Failure to open credentials cache %s: %s (%d)",
++ name, error_message(kerr), kerr);
++ free(name);
++ goto done;
++ }
++ }
++
++ kerr = verify_server_credentials(r, kcontext, ccache, princ, &renew);
++
++ if (kerr || !renew) {
++ goto done;
++ }
++
++#ifdef STANDARD20_MODULE_STUFF
++ if (s4u2proxy_lock) {
++ rv = apr_global_mutex_lock(s4u2proxy_lock);
++ if (rv != APR_SUCCESS) {
++ ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
++ "apr_global_mutex_lock(s4u2proxy_lock) "
++ "failed");
++ }
++ }
++#endif
++
++ /* We have the lock, check again to be sure another process hasn't already
++ * renewed the ticket.
++ */
++ kerr = verify_server_credentials(r, kcontext, ccache, princ, &renew);
++ if (kerr || !renew) {
++ goto unlock;
++ }
++
++ if (NULL == princ) {
++ princ_name = apr_psprintf(r->pool, "%s/%s",
++ (service_name) ? service_name : SERVICE_NAME,
++ ap_get_server_name(r));
++
++ if ((kerr = krb5_parse_name(kcontext, princ_name, &princ))) {
++ log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
++ "Could not parse principal %s: %s (%d) ",
++ princ_name, error_message(kerr), kerr);
++ goto unlock;
++ }
++ } else if (NULL == princ_name) {
++ if ((kerr = krb5_unparse_name(kcontext, princ, &princ_name))) {
++ log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
++ "Could not unparse principal %s: %s (%d)",
++ princ_name, error_message(kerr), kerr);
++ goto unlock;
++ }
++ }
++
++ if ((kerr = krb5_kt_default(kcontext, &keytab))) {
++ log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
++ "Unable to get default keytab: %s (%d)",
++ error_message(kerr), kerr);
++ goto unlock;
++ }
++
++ log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
++ "Obtaining new credentials for %s", princ_name);
++ krb5_get_init_creds_opt_init(&gicopts);
++ krb5_get_init_creds_opt_set_forwardable(&gicopts, 1);
++
++ tgs_princ_name = apr_psprintf(r->pool, "%s/%.*s@%.*s", KRB5_TGS_NAME,
++ krb5_princ_realm(kcontext, princ)->length,
++ krb5_princ_realm(kcontext, princ)->data,
++ krb5_princ_realm(kcontext, princ)->length,
++ krb5_princ_realm(kcontext, princ)->data);
++
++ if ((kerr = krb5_get_init_creds_keytab(kcontext, &creds, princ, keytab,
++ 0, tgs_princ_name, &gicopts))) {
++ log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
++ "Failed to obtain credentials for principal %s: "
++ "%s (%d)", princ_name, error_message(kerr), kerr);
++ goto unlock;
++ }
++
++ krb5_kt_close(kcontext, keytab);
++ keytab = NULL;
++
++ if (NULL == ccache) {
++ if ((kerr = krb5_cc_default(kcontext, &ccache))) {
++ log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
++ "Failed to open default ccache: %s (%d)",
++ error_message(kerr), kerr);
++ goto unlock;
++ }
++ }
++
++ if ((kerr = krb5_cc_initialize(kcontext, ccache, princ))) {
++ log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
++ "Failed to initialize ccache for %s: %s (%d)",
++ princ_name, error_message(kerr), kerr);
++ goto unlock;
++ }
++
++ if ((kerr = krb5_cc_store_cred(kcontext, ccache, &creds))) {
++ log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
++ "Failed to store %s in ccache: %s (%d)",
++ princ_name, error_message(kerr), kerr);
++ goto unlock;
++ }
++
++unlock:
++#ifdef STANDARD20_MODULE_STUFF
++ if (s4u2proxy_lock) {
++ apr_global_mutex_unlock(s4u2proxy_lock);
++ if (rv != APR_SUCCESS) {
++ ap_log_rerror(APLOG_MARK, APLOG_ERR, rv, r,
++ "apr_global_mutex_unlock(s4u2proxy_lock) "
++ "failed");
++ }
++ }
++#endif
++
++done:
++ if (0 == kerr)
++ log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
++ "Done obtaining credentials for s4u2proxy");
++ else
++ log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
++ "Failed to obtain credentials for s4u2proxy");
++
++ if (creds.client) {
++ krb5_free_cred_contents(kcontext, &creds);
++ }
++ if (ccache) {
++ krb5_cc_close(kcontext, ccache);
++ }
++ if (kcontext) {
++ krb5_free_context(kcontext);
++ }
++
++ return kerr;
++}
++
+ static int
+ authenticate_user_gss(request_rec *r, kerb_auth_config *conf,
+ const char *auth_line, char **negotiate_ret_value)
+@@ -1697,10 +2052,60 @@ have_rcache_type(const char *type)
+ /***************************************************************************
+ Module Setup/Configuration
+ ***************************************************************************/
++#ifdef STANDARD20_MODULE_STUFF
++static apr_status_t
++s4u2proxylock_create(server_rec *s, apr_pool_t *p)
++{
++ apr_status_t rc;
++
++ /* only operate if a lockfile is used */
++ if (lockname == NULL || *(lockname) == '\0') {
++ return APR_SUCCESS;
++ }
++
++ /* create the lockfile */
++ rc = apr_global_mutex_create(&s4u2proxy_lock, lockname,
++ APR_LOCK_DEFAULT, p);
++ if (rc != APR_SUCCESS) {
++ ap_log_error(APLOG_MARK, APLOG_CRIT, rc, s,
++ "Parent could not create lock file %s", lockname);
++ return rc;
++ }
++
++#ifdef AP_NEED_SET_MUTEX_PERMS
++ rc = unixd_set_global_mutex_perms(s4u2proxy_lock);
++ if (rc != APR_SUCCESS) {
++ ap_log_error(APLOG_MARK, APLOG_CRIT, rc, s,
++ "mod_auth_kerb: Parent could not set permissions "
++ "on lock; check User and Group directives");
++ return rc;
++ }
++#endif
++
++ return APR_SUCCESS;
++}
++
++static apr_status_t
++s4u2proxylock_remove(void *unused)
++{
++ /* only operate if a lockfile is used */
++ if (lockname == NULL || *(lockname) == '\0') {
++ return APR_SUCCESS;
++ }
++
++ /* destroy the rewritelock */
++ apr_global_mutex_destroy(s4u2proxy_lock);
++ s4u2proxy_lock = NULL;
++ lockname = NULL;
++ return APR_SUCCESS;
++}
++#endif
++
+ #ifndef STANDARD20_MODULE_STUFF
+ static void
+ kerb_module_init(server_rec *dummy, pool *p)
+ {
++ apr_status_t status;
+ #ifndef HEIMDAL
+ /* Suppress the MIT replay cache. Requires MIT Kerberos 1.4.0 or later.
+ 1.3.x are covered by the hack overiding the replay calls */
+@@ -1741,6 +2146,7 @@ static int
+ kerb_init_handler(apr_pool_t *p, apr_pool_t *plog,
+ apr_pool_t *ptemp, server_rec *s)
+ {
++ apr_status_t rv;
+ ap_add_version_component(p, "mod_auth_kerb/" MODAUTHKERB_VERSION);
+ #ifndef HEIMDAL
+ /* Suppress the MIT replay cache. Requires MIT Kerberos 1.4.0 or later.
+@@ -1748,14 +2154,41 @@ kerb_init_handler(apr_pool_t *p, apr_poo
+ if (getenv("KRB5RCACHETYPE") == NULL && have_rcache_type("none"))
+ putenv(strdup("KRB5RCACHETYPE=none"));
+ #endif
++#ifdef STANDARD20_MODULE_STUFF
++ rv = s4u2proxylock_create(s, p);
++ if (rv != APR_SUCCESS) {
++ return HTTP_INTERNAL_SERVER_ERROR;
++ }
++
++ apr_pool_cleanup_register(p, (void *)s, s4u2proxylock_remove,
++ apr_pool_cleanup_null);
++#endif
+
+ return OK;
+ }
+
+ static void
++initialize_child(apr_pool_t *p, server_rec *s)
++{
++ apr_status_t rv = 0;
++
++#ifdef STANDARD20_MODULE_STUFF
++ if (lockname != NULL && *(lockname) != '\0') {
++ rv = apr_global_mutex_child_init(&s4u2proxy_lock, lockname, p);
++ if (rv != APR_SUCCESS) {
++ ap_log_error(APLOG_MARK, APLOG_CRIT, rv, s,
++ "mod_auth_kerb: could not init s4u2proxy_lock"
++ " in child");
++ }
++ }
++#endif
++}
++
++static void
+ kerb_register_hooks(apr_pool_t *p)
+ {
+ ap_hook_post_config(kerb_init_handler, NULL, NULL, APR_HOOK_MIDDLE);
++ ap_hook_child_init(initialize_child, NULL, NULL, APR_HOOK_MIDDLE);
+ ap_hook_check_user_id(kerb_authenticate_user, NULL, NULL, APR_HOOK_MIDDLE);
+ }
+