diff options
Diffstat (limited to 'www-apache/mod_auth_kerb/files/mod_auth_kerb-5.4-s4u2proxy.patch')
| -rw-r--r-- | www-apache/mod_auth_kerb/files/mod_auth_kerb-5.4-s4u2proxy.patch | 601 |
1 files changed, 0 insertions, 601 deletions
diff --git a/www-apache/mod_auth_kerb/files/mod_auth_kerb-5.4-s4u2proxy.patch b/www-apache/mod_auth_kerb/files/mod_auth_kerb-5.4-s4u2proxy.patch deleted file mode 100644 index 07a6e3b7c8ef..000000000000 --- a/www-apache/mod_auth_kerb/files/mod_auth_kerb-5.4-s4u2proxy.patch +++ /dev/null @@ -1,601 +0,0 @@ - -Add S4U2Proxy feature: - -http://sourceforge.net/mailarchive/forum.php?thread_name=4EE665D1.3000308%40redhat.com&forum_name=modauthkerb-help - -The attached patches add support for using s4u2proxy -(http://k5wiki.kerberos.org/wiki/Projects/Services4User) to allow the -web service to obtain credentials on behalf of the authenticated user. - -The first patch adds basic support for s4u2proxy. This requires the web -administrator to manually create and manage the credentails cache for -the apache user (via a cron job, for example). - -The second patch builds on this and makes mod_auth_kerb manage the -ccache instead. - -These are patches against the current CVS HEAD (mod_auth_krb 5.4). - -I've added a new module option to enable this support, -KrbConstrainedDelegation. The default is off. - -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 2014-01-21 13:46:21.482223432 -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 2014-01-21 13:45:21.605538007 -0500 -+++ mod_auth_kerb-5.4/src/mod_auth_kerb.c 2014-01-21 13:46:46.746668762 -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 +1325,302 @@ 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) { -+ if (strchr(service_name, '/') != NULL) -+ kerr = krb5_parse_name(kcontext, service_name, &princ); -+ else -+ kerr = krb5_sname_to_principal(kcontext, ap_get_server_name(r), -+ (service_name) ? service_name : SERVICE_NAME, -+ KRB5_NT_SRV_HST, &princ); -+ -+ if (kerr) { -+ log_rerror(APLOG_MARK, APLOG_ERR, 0, r, -+ "Could not parse principal: %s (%d) ", -+ error_message(kerr), kerr); -+ goto unlock; -+ } -+ -+ 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); -+ } -+ } 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 +2061,60 @@ 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 +2155,7 @@ 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 +2163,41 @@ 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); - } - |