+/*
+ * Daniel Kouril <kouril@users.sourceforge.net>
+ *
+ * Source and Documentation can be found at:
+ * http://modauthkerb.sourceforge.net/
+ *
+ * Based on work by
+ * James E. Robinson, III <james@ncstate.net>
+ * Daniel Henninger <daniel@ncsu.edu>
+ * Ludek Sulak <xsulak@fi.muni.cz>
+ */
+
+/* ====================================================================
+ * The Apache Software License, Version 1.1
+ *
+ * Copyright (c) 2000-2003 The Apache Software Foundation. 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.
+ *
+ * 3. The end-user documentation included with the redistribution,
+ * if any, must include the following acknowledgment:
+ * "This product includes software developed by the
+ * Apache Software Foundation (http://www.apache.org/)."
+ * Alternately, this acknowledgment may appear in the software itself,
+ * if and wherever such third-party acknowledgments normally appear.
+ *
+ * 4. The names "Apache" and "Apache Software Foundation" must
+ * not be used to endorse or promote products derived from this
+ * software without prior written permission. For written
+ * permission, please contact apache@apache.org.
+ *
+ * 5. Products derived from this software may not be called "Apache",
+ * nor may "Apache" appear in their name, without prior written
+ * permission of the Apache Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 APACHE SOFTWARE FOUNDATION OR
+ * ITS CONTRIBUTORS 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.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Software Foundation. For more
+ * information on the Apache Software Foundation, please see
+ * <http://www.apache.org/>.
+ *
+ * Portions of this software are based upon public domain software
+ * originally written at the National Center for Supercomputing Applications,
+ * University of Illinois, Urbana-Champaign.
+ */
+
#ident "$Id$"
+#include "config.h"
+
+#define MODAUTHKERB_VERSION "5.0-rc3"
+
#ifndef APXS1
#include "ap_compat.h"
#include "apr_strings.h"
#ifdef KRB5
#include <krb5.h>
-#include <gssapi.h>
+#ifdef HEIMDAL
+# include <gssapi.h>
+#else
+# include <gssapi/gssapi.h>
+# include <gssapi/gssapi_generic.h>
+# define GSS_C_NT_USER_NAME gss_nt_user_name
+# define GSS_C_NT_HOSTBASED_SERVICE gss_nt_service_name
+# define krb5_get_err_text(context,code) error_message(code)
+#endif
+#include "spnegokrb5.h"
#endif /* KRB5 */
#ifdef KRB4
+/*Prevent warning about closesocket redefinition (Apache's ap_config.h and
+ * MIT Kerberos' port-sockets.h both define it as close) */
+#ifdef closesocket
+# undef closesocket
+#endif
#include <krb.h>
+#include <netdb.h> /* gethostbyname() */
#endif /* KRB4 */
#ifdef APXS1
#ifdef APXS1
#define MK_POOL pool
#define MK_TABLE_GET ap_table_get
-#define MK_TABLE_SET ap_table_set
-#define MK_TABLE_TYPE table
-#define MK_PSTRDUP ap_pstrdup
#define MK_USER r->connection->user
#define MK_AUTH_TYPE r->connection->ap_auth_type
-#define MK_ARRAY_HEADER array_header
#else
#define MK_POOL apr_pool_t
#define MK_TABLE_GET apr_table_get
-#define MK_TABLE_SET apr_table_set
-#define MK_TABLE_TYPE apr_table_t
-#define MK_PSTRDUP apr_pstrdup
#define MK_USER r->user
#define MK_AUTH_TYPE r->ap_auth_type
-#define MK_ARRAY_HEADER apr_array_header_t
#endif /* APXS1 */
***************************************************************************/
typedef struct {
char *krb_auth_realms;
- int krb_fail_status;
- char *krb_force_instance;
int krb_save_credentials;
- char *krb_tmp_dir;
- char *service_name;
- char *krb_lifetime;
+ int krb_verify_kdc;
+ char *krb_service_name;
+ int krb_authoritative;
#ifdef KRB5
char *krb_5_keytab;
- int krb_forwardable;
int krb_method_gssapi;
int krb_method_k5pass;
#endif
#endif
static const command_rec kerb_auth_cmds[] = {
- command("KrbAuthRealm", krb5_save_realms, krb_auth_realms,
- RAW_ARGS, "Realms to attempt authentication against (can be multiple)."),
-
command("KrbAuthRealms", krb5_save_realms, krb_auth_realms,
- RAW_ARGS, "Alias for KrbAuthRealm."),
-
-#if 0
- command("KrbFailStatus", kerb_set_fail_slot, krb_fail_status,
- TAKE1, "If auth fails, return status set here."),
-#endif
+ RAW_ARGS, "Realms to attempt authentication against (can be multiple)."),
- command("KrbForceInstance", ap_set_string_slot, krb_force_instance,
- TAKE1, "Force authentication against an instance specified here."),
+ command("KrbAuthRealm", krb5_save_realms, krb_auth_realms,
+ RAW_ARGS, "Alias for KrbAuthRealms."),
command("KrbSaveCredentials", ap_set_flag_slot, krb_save_credentials,
FLAG, "Save and store credentials/tickets retrieved during auth."),
- command("KrbSaveTickets", ap_set_flag_slot, krb_save_credentials,
- FLAG, "Alias for KrbSaveCredentials."),
-
- command("KrbTmpdir", ap_set_string_slot, krb_tmp_dir,
- TAKE1, "Path to store ticket files and such in."),
+ command("KrbVerifyKDC", ap_set_flag_slot, krb_verify_kdc,
+ FLAG, "Verify tickets against keytab to prevent KDC spoofing attacks."),
- command("KrbServiceName", ap_set_string_slot, service_name,
- TAKE1, "Kerberos service name to be used by apache."),
+ command("KrbServiceName", ap_set_string_slot, krb_service_name,
+ TAKE1, "Service name to be used by Apache for authentication."),
-#if 0
- command("KrbLifetime", ap_set_string_slot, krb_lifetime,
- TAKE1, "Kerberos ticket lifetime."),
-#endif
+ command("KrbAuthoritative", ap_set_flag_slot, krb_authoritative,
+ FLAG, "Set to 'off' to allow access control to be passed along to lower modules if the UserID is not known to this module."),
#ifdef KRB5
command("Krb5Keytab", ap_set_file_slot, krb_5_keytab,
TAKE1, "Location of Kerberos V5 keytab file."),
- command("KrbForwardable", ap_set_flag_slot, krb_forwardable,
- FLAG, "Credentials retrieved will be flagged as forwardable."),
-
- command("KrbMethodGSSAPI", ap_set_flag_slot, krb_method_gssapi,
- FLAG, "Enable GSSAPI authentication."),
+ command("KrbMethodNegotiate", ap_set_flag_slot, krb_method_gssapi,
+ FLAG, "Enable Negotiate authentication method."),
command("KrbMethodK5Pass", ap_set_flag_slot, krb_method_k5pass,
FLAG, "Enable Kerberos V5 password authentication."),
kerb_auth_config *rec;
rec = (kerb_auth_config *) ap_pcalloc(p, sizeof(kerb_auth_config));
- ((kerb_auth_config *)rec)->krb_fail_status = HTTP_UNAUTHORIZED;
+ ((kerb_auth_config *)rec)->krb_verify_kdc = 1;
+ ((kerb_auth_config *)rec)->krb_service_name = "khttp";
+ ((kerb_auth_config *)rec)->krb_authoritative = 1;
#ifdef KRB5
((kerb_auth_config *)rec)->krb_method_k5pass = 1;
((kerb_auth_config *)rec)->krb_method_gssapi = 1;
const request_rec *r, const char *fmt, ...)
{
char errstr[1024];
+ char errnostr[1024];
va_list ap;
va_start(ap, fmt);
vsnprintf(errstr, sizeof(errstr), fmt, ap);
va_end(ap);
+ errnostr[0] = '\0';
+ if (errno)
+ snprintf(errnostr, sizeof(errnostr), "%s: (%s)", errstr, strerror(errno));
+ else
+ snprintf(errnostr, sizeof(errnostr), "%s", errstr);
+
#ifdef APXS1
- ap_log_rerror(file, line, level, r, "%s", errstr);
+ ap_log_rerror(file, line, level | APLOG_NOERRNO, r, "%s", errnostr);
#else
- ap_log_rerror(file, line, level, status, r, "%s", errstr);
+ ap_log_rerror(file, line, level | APLOG_NOERRNO, status, r, "%s", errnostr);
#endif
}
-#if 0
-static const char *kerb_set_fail_slot(cmd_parms *cmd, void *struct_ptr,
- const char *arg)
-{
- int offset = (int) (long) cmd->info;
- if (!strncasecmp(arg, "unauthorized", 12))
- *(int *) ((char *)struct_ptr + offset) = HTTP_UNAUTHORIZED;
- else if (!strncasecmp(arg, "forbidden", 9))
- *(int *) ((char *)struct_ptr + offset) = HTTP_FORBIDDEN;
- else if (!strncasecmp(arg, "declined", 8))
- *(int *) ((char *)struct_ptr + offset) = DECLINED;
- else
- return "KrbAuthFailStatus must be Forbidden, Unauthorized, or Declined.";
- return NULL;
-}
-#endif
-
#ifdef KRB4
/***************************************************************************
Username/Password Validation for Krb4
***************************************************************************/
-int kerb4_password_validate(request_rec *r, const char *user, const char *pass)
+static int
+verify_krb4_user(request_rec *r, char *name, char *instance, char *realm,
+ char *password, char *linstance, char *srvtab, int krb_verify_kdc)
{
- kerb_auth_config *conf =
- (kerb_auth_config *)ap_get_module_config(r->per_dir_config,
- &auth_kerb_module);
- int ret;
- int lifetime = DEFAULT_TKT_LIFE;
- char *c, *tfname;
- char *username = NULL;
- char *instance = NULL;
- char *realm = NULL;
-
- username = (char *)ap_pstrdup(r->pool, user);
- if (!username) {
- return 0;
- }
-
- instance = strchr(username, '.');
- if (instance) {
- *instance++ = '\0';
- }
- else {
- instance = "";
- }
-
- realm = strchr(username, '@');
- if (realm) {
- *realm++ = '\0';
- }
- else {
- realm = "";
- }
-
- if (conf->krb_lifetime) {
- lifetime = atoi(conf->krb_lifetime);
- }
-
- if (conf->krb_force_instance) {
- instance = conf->krb_force_instance;
- }
-
- if (conf->krb_save_credentials) {
- tfname = (char *)malloc(sizeof(char) * MAX_STRING_LEN);
- sprintf(tfname, "%s/k5cc_ap_%s",
- conf->krb_tmp_dir ? conf->krb_tmp_dir : "/tmp",
- MK_USER);
-
- if (!strcmp(instance, "")) {
- tfname = strcat(tfname, ".");
- tfname = strcat(tfname, instance);
- }
-
- if (!strcmp(realm, "")) {
- tfname = strcat(tfname, ".");
- tfname = strcat(tfname, realm);
- }
-
- for (c = tfname + strlen(conf->krb_tmp_dir ? conf->krb_tmp_dir :
- "/tmp") + 1; *c; c++) {
- if (*c == '/')
- *c = '.';
- }
-
- krb_set_tkt_string(tfname);
- }
-
- if (!strcmp(realm, "")) {
- realm = (char *)malloc(sizeof(char) * (REALM_SZ + 1));
- ret = krb_get_lrealm(realm, 1);
- if (ret != KSUCCESS)
- return 0;
- }
-
- ret = krb_get_pw_in_tkt((char *)user, instance, realm, "krbtgt", realm,
- lifetime, (char *)pass);
- switch (ret) {
- case INTK_OK:
- case INTK_W_NOTALL:
- return 1;
- break;
-
- default:
- return 0;
- break;
- }
+ int ret;
+ char *phost;
+ unsigned long addr;
+ struct hostent *hp;
+ const char *hostname;
+ KTEXT_ST ticket;
+ AUTH_DAT authdata;
+ char lrealm[REALM_SZ];
+
+ ret = krb_get_pw_in_tkt(name, instance, realm, "krbtgt", realm,
+ DEFAULT_TKT_LIFE, password);
+ if (ret) {
+ log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
+ "Cannot get krb4 ticket: krb_get_pw_in_tkt() failed: %s",
+ krb_get_err_text(ret));
+ return ret;
+ }
+
+ if (!krb_verify_kdc)
+ return ret;
+
+ hostname = ap_get_server_name(r);
+
+ hp = gethostbyname(hostname);
+ if (hp == NULL) {
+ dest_tkt();
+ log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
+ "Cannot verify krb4 ticket: gethostbyname() failed: %s",
+ hstrerror(h_errno));
+ return h_errno;
+ }
+ memcpy(&addr, hp->h_addr, sizeof(addr));
+
+ phost = krb_get_phost((char *)hostname);
+
+ krb_get_lrealm(lrealm, 1);
+
+ ret = krb_mk_req(&ticket, linstance, phost, lrealm, 0);
+ if (ret) {
+ log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
+ "Cannot verify krb4 ticket: krb_mk_req() failed: %s",
+ krb_get_err_text(ret));
+ dest_tkt();
+ return ret;
+ }
+
+ ret = krb_rd_req(&ticket, linstance, phost, addr, &authdata, srvtab);
+ if (ret) {
+ log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
+ "Cannot verify krb4 ticket: krb_rd_req() failed: %s",
+ krb_get_err_text(ret));
+ dest_tkt();
+ }
+
+ return ret;
+}
+
+static int
+krb4_cache_cleanup(void *data)
+{
+ char *tkt_file = (char *) data;
+
+ krb_set_tkt_string(tkt_file);
+ dest_tkt();
+ return OK;
+}
+
+static int
+authenticate_user_krb4pwd(request_rec *r,
+ kerb_auth_config *conf,
+ const char *auth_line)
+{
+ int ret;
+ const char *sent_pw;
+ const char *sent_name;
+ char *sent_instance;
+ char tkt_file[32];
+ char *tkt_file_p = NULL;
+ int fd;
+ const char *realms;
+ const char *realm;
+ char *user;
+ char lrealm[REALM_SZ];
+ int all_principals_unkown;
+
+ sent_pw = ap_pbase64decode(r->pool, auth_line);
+ sent_name = ap_getword (r->pool, &sent_pw, ':');
+
+ /* do not allow user to override realm setting of server */
+ if (strchr(sent_name, '@')) {
+ log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
+ "specifying realm in user name is prohibited");
+ return HTTP_UNAUTHORIZED;
+ }
+
+ sent_instance = strchr(sent_name, '.');
+ if (sent_instance)
+ *sent_instance++ = '\0';
+
+ snprintf(tkt_file, sizeof(tkt_file), "/tmp/apache_tkt_XXXXXX");
+ fd = mkstemp(tkt_file);
+ if (fd < 0) {
+ log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
+ "Cannot create krb4 ccache: mkstemp() failed: %s",
+ strerror(errno));
+ return HTTP_INTERNAL_SERVER_ERROR;
+ }
+
+ tkt_file_p = ap_pstrdup(r->pool, tkt_file);
+ ap_register_cleanup(r->pool, tkt_file_p,
+ krb4_cache_cleanup, ap_null_cleanup);
+
+ krb_set_tkt_string(tkt_file);
+
+ all_principals_unkown = 1;
+ realms = conf->krb_auth_realms;
+ do {
+ memset(lrealm, 0, sizeof(lrealm));
+ realm = NULL;
+ if (realms)
+ realm = ap_getword_white(r->pool, &realms);
+
+ if (realm == NULL) {
+ ret = krb_get_lrealm(lrealm, 1);
+ realm = lrealm;
+ }
+ if (realm == NULL || *realm == '\0')
+ break;
+
+ ret = verify_krb4_user(r, (char *)sent_name,
+ (sent_instance) ? sent_instance : "",
+ (char *)realm, (char *)sent_pw,
+ conf->krb_service_name,
+ conf->krb_4_srvtab, conf->krb_verify_kdc);
+ if (!conf->krb_authoritative && ret) {
+ /* if we're not authoritative, we allow authentication to pass on
+ * to another modules if (and only if) the user is not known to us */
+ if (all_principals_unkown && ret != KDC_PR_UNKNOWN)
+ all_principals_unkown = 0;
+ }
+
+ if (ret == 0)
+ break;
+ } while (realms && *realms);
+
+ if (ret) {
+ /* XXX log only in the verify_krb4_user() call */
+ log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "Verifying krb4 password failed");
+ ret = (!conf->krb_authoritative && all_principals_unkown == 1 && ret == KDC_PR_UNKNOWN) ?
+ DECLINED : HTTP_UNAUTHORIZED;
+ goto end;
+ }
+
+ user = ap_pstrdup(r->pool, sent_name);
+ if (sent_instance)
+ user = ap_pstrcat(r->pool, user, ".", sent_instance, NULL);
+ user = ap_pstrcat(r->pool, user, "@", realm, NULL);
+
+ MK_USER = user;
+ MK_AUTH_TYPE = "Basic";
+ ap_table_setn(r->subprocess_env, "KRBTKFILE", tkt_file_p);
+
+ if (!conf->krb_save_credentials)
+ krb4_cache_cleanup(tkt_file);
+
+end:
+ if (ret)
+ krb4_cache_cleanup(tkt_file);
+ close(fd);
+ tf_close();
+
+ return ret;
}
#endif /* KRB4 */
/***************************************************************************
Username/Password Validation for Krb5
***************************************************************************/
-#ifndef HEIMDAL
-krb5_error_code
-krb5_verify_user(krb5_context context, krb5_principal principal,
- krb5_ccache ccache, const char *password, krb5_boolean secure,
- const char *service)
+/* Inspired by krb5_verify_user from Heimdal */
+static krb5_error_code
+verify_krb5_user(request_rec *r, krb5_context context, krb5_principal principal,
+ krb5_ccache ccache, const char *password, const char *service,
+ krb5_keytab keytab, int krb_verify_kdc)
{
- int ret;
- krb5_context kcontext;
- krb5_principal server, client;
- krb5_timestamp now;
- krb5_creds my_creds;
- krb5_flags options = 0;
- krb5_principal me = NULL;
- krb5_data tgtname = {
- 0,
- KRB5_TGS_NAME_SIZE,
- KRB5_TGS_NAME
- };
-
- memset((char *)&my_creds, 0, sizeof(my_creds));
- my_creds.client = principal;
-
- if (krb5_build_principal_ext(kcontext, &server,
- krb5_princ_realm(kcontext, me)->length,
- krb5_princ_realm(kcontext, me)->data,
- tgtname.length, tgtname.data,
- krb5_princ_realm(kcontext, me)->length,
- krb5_princ_realm(kcontext, me)->data,
- 0)) {
- return ret;
- }
+ krb5_creds creds;
+ krb5_principal server = NULL;
+ krb5_error_code ret;
+ krb5_verify_init_creds_opt opt;
- my_creds.server = server;
- if (krb5_timeofday(kcontext, &now))
- return -1;
+ memset(&creds, 0, sizeof(creds));
- my_creds.times.starttime = 0;
- /* XXX
- my_creds.times.endtime = now + lifetime;
- my_creds.times.renew_till = now + renewal;
- */
+ ret = krb5_get_init_creds_password(context, &creds, principal,
+ (char *)password, krb5_prompter_posix,
+ NULL, 0, NULL, NULL);
+ if (ret)
+ return ret;
- ret = krb5_get_in_tkt_with_password(kcontext, options, 0, NULL, 0,
- password, ccache, &my_creds, 0);
- if (ret) {
- return ret;
+ ret = krb5_sname_to_principal(context, ap_get_server_name(r), service,
+ KRB5_NT_SRV_HST, &server);
+ if (ret)
+ goto end;
+
+ krb5_verify_init_creds_opt_init(&opt);
+ krb5_verify_init_creds_opt_set_ap_req_nofail(&opt, krb_verify_kdc);
+
+ ret = krb5_verify_init_creds(context, &creds, server, keytab, NULL, &opt);
+ if (ret)
+ goto end;
+
+ if (ccache) {
+ ret = krb5_cc_initialize(context, ccache, principal);
+ if (ret == 0)
+ ret = krb5_cc_store_cred(context, ccache, &creds);
}
- return 0;
+end:
+ krb5_free_cred_contents(context, &creds);
+ if (server)
+ krb5_free_principal(context, server);
+ return ret;
}
-#endif
-
static int
krb5_cache_cleanup(void *data)
krb5_principal princ,
krb5_ccache *ccache)
{
- char *c, ccname[MAX_STRING_LEN];
- krb5_error_code problem;
- int ret;
- krb5_ccache tmp_ccache = NULL;
-
- snprintf(ccname, sizeof(ccname), "FILE:%s/k5cc_ap_%s",
- conf->krb_tmp_dir ? conf->krb_tmp_dir : "/tmp",
- MK_USER);
-
- for (c = ccname + strlen(conf->krb_tmp_dir ? conf->krb_tmp_dir :
- "/tmp") + 1; *c; c++) {
- if (*c == '/')
- *c = '.';
- }
-
- problem = krb5_cc_resolve(kcontext, ccname, &tmp_ccache);
- if (problem) {
- log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
- "Cannot create krb5 ccache: krb5_cc_resolve() failed: %s",
- krb5_get_err_text(kcontext, problem));
- ret = HTTP_INTERNAL_SERVER_ERROR;
- goto end;
- }
-
- problem = krb5_cc_initialize(kcontext, tmp_ccache, princ);
- if (problem) {
- log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
- "Cannot create krb5 ccache: krb5_cc_initialize() failed: %s",
- krb5_get_err_text(kcontext, problem));
- ret = HTTP_INTERNAL_SERVER_ERROR;
- goto end;
- }
-
- ap_table_setn(r->subprocess_env, "KRB5CCNAME", ccname);
- ap_register_cleanup(r->pool, ccname,
- krb5_cache_cleanup, ap_null_cleanup);
-
- *ccache = tmp_ccache;
- tmp_ccache = NULL;
-
- ret = OK;
+ char *ccname;
+ krb5_error_code problem;
+ int ret;
+ krb5_ccache tmp_ccache = NULL;
+
+#ifdef HAVE_KRB5_CC_GEN_NEW
+ problem = krb5_cc_gen_new(kcontext, &krb5_fcc_ops, &tmp_ccache);
+#else
+ /* only older MIT seem to not have the krb5_cc_gen_new() call, so we use
+ * MIT specific call here */
+ problem = krb5_fcc_generate_new(kcontext, &tmp_ccache);
+ /* krb5_fcc_generate_new() doesn't set KRB5_TC_OPENCLOSE, which makes
+ krb5_cc_initialize() fail */
+ krb5_fcc_set_flags(kcontext, tmp_ccache, KRB5_TC_OPENCLOSE);
+#endif
+ if (problem) {
+ log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
+ "Cannot create file for new krb5 ccache: %s",
+ krb5_get_err_text(kcontext, problem));
+ ret = HTTP_INTERNAL_SERVER_ERROR;
+ goto end;
+ }
+
+ ccname = ap_pstrdup(r->pool, krb5_cc_get_name(kcontext, tmp_ccache));
+
+ problem = krb5_cc_initialize(kcontext, tmp_ccache, princ);
+ if (problem) {
+ log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
+ "Cannot initialize krb5 ccache %s: krb5_cc_initialize() failed: %s",
+ ccname, krb5_get_err_text(kcontext, problem));
+ ret = HTTP_INTERNAL_SERVER_ERROR;
+ goto end;
+ }
+
+ ap_table_setn(r->subprocess_env, "KRB5CCNAME", ccname);
+ ap_register_cleanup(r->pool, ccname,
+ krb5_cache_cleanup, ap_null_cleanup);
+
+ *ccache = tmp_ccache;
+ tmp_ccache = NULL;
+
+ ret = OK;
end:
- if (tmp_ccache)
- krb5_cc_destroy(kcontext, tmp_ccache);
+ if (tmp_ccache)
+ krb5_cc_destroy(kcontext, tmp_ccache);
- return ret;
+ return ret;
}
static int
return ret;
}
+#ifdef HEIMDAL
problem = krb5_cc_copy_cache(kcontext, delegated_cred, ccache);
+#else
+ problem = krb5_cc_copy_creds(kcontext, delegated_cred, ccache);
+#endif
krb5_free_principal(kcontext, princ);
if (problem) {
- snprintf(errstr, sizeof(errstr), "krb5_cc_copy_cache() failed: %s",
+ snprintf(errstr, sizeof(errstr), "Failed to store credentials: %s",
krb5_get_err_text(kcontext, problem));
krb5_cc_destroy(kcontext, ccache);
return HTTP_INTERNAL_SERVER_ERROR;
const char *auth_line)
{
const char *sent_pw = NULL;
+ const char *sent_name = NULL;
const char *realms = NULL;
krb5_context kcontext = NULL;
krb5_error_code code;
krb5_principal client = NULL;
krb5_ccache ccache = NULL;
+ krb5_keytab keytab = NULL;
int ret;
+ char *name = NULL;
+ int all_principals_unkown;
code = krb5_init_context(&kcontext);
if (code) {
}
sent_pw = ap_pbase64decode(r->pool, auth_line);
- MK_USER = ap_getword (r->pool, &sent_pw, ':');
- MK_AUTH_TYPE = "Basic";
-
+ sent_name = ap_getword (r->pool, &sent_pw, ':');
/* do not allow user to override realm setting of server */
- if (strchr(MK_USER, '@')) {
+ if (strchr(sent_name, '@')) {
log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
"specifying realm in user name is prohibited");
ret = HTTP_UNAUTHORIZED;
goto end;
}
-#ifdef HEIMDAL
+#ifdef HAVE_KRB5_CC_GEN_NEW
code = krb5_cc_gen_new(kcontext, &krb5_mcc_ops, &ccache);
#else
+ /* only older MIT seem to not have the krb5_cc_gen_new() call, so we use
+ * MIT specific call here */
code = krb5_mcc_generate_new(kcontext, &ccache);
#endif
if (code) {
}
if (conf->krb_5_keytab)
- /* setenv("KRB5_KTNAME", conf->krb_5_keytab, 1); */
- kcontext->default_keytab = conf->krb_5_keytab;
+ krb5_kt_resolve(kcontext, conf->krb_5_keytab, &keytab);
+ all_principals_unkown = 1;
realms = conf->krb_auth_realms;
do {
if (realms && (code = krb5_set_default_realm(kcontext,
ap_getword_white(r->pool, &realms))))
continue;
- code = krb5_parse_name(kcontext, MK_USER, &client);
+ if (client) {
+ krb5_free_principal(kcontext, client);
+ client = NULL;
+ }
+ code = krb5_parse_name(kcontext, sent_name, &client);
if (code)
continue;
- code = krb5_verify_user(kcontext, client, ccache, sent_pw, 1,
- (conf->service_name) ? conf->service_name : "khttp");
- krb5_free_principal(kcontext, client);
- client = NULL;
+ code = verify_krb5_user(r, kcontext, client, ccache, sent_pw,
+ conf->krb_service_name,
+ keytab, conf->krb_verify_kdc);
+ if (!conf->krb_authoritative && code) {
+ /* if we're not authoritative, we allow authentication to pass on
+ * to another modules if (and only if) the user is not known to us */
+ if (all_principals_unkown && code != KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN)
+ all_principals_unkown = 0;
+ }
+
if (code == 0)
break;
memset((char *)sent_pw, 0, strlen(sent_pw));
if (code) {
+ /* XXX log only in the verify_krb5_user() call */
log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
"Verifying krb5 password failed: %s",
krb5_get_err_text(kcontext, code));
- ret = HTTP_UNAUTHORIZED;
+ if (!conf->krb_authoritative && all_principals_unkown == 1 && code == KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN)
+ ret = DECLINED;
+ else
+ ret = HTTP_UNAUTHORIZED;
+
goto end;
}
- if (conf->krb_save_credentials) {
- ret = store_krb5_creds(kcontext, r, conf, ccache);
- if (ret) /* Ignore error ?? */
- goto end;
+ code = krb5_unparse_name(kcontext, client, &name);
+ if (code) {
+ log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "krb5_unparse_name() failed: %s",
+ krb5_get_err_text(kcontext, code));
+ ret = HTTP_UNAUTHORIZED;
+ goto end;
}
+ MK_USER = ap_pstrdup (r->pool, name);
+ MK_AUTH_TYPE = "Basic";
+ free(name);
+
+ if (conf->krb_save_credentials)
+ store_krb5_creds(kcontext, r, conf, ccache);
ret = OK;
krb5_free_principal(kcontext, client);
if (ccache)
krb5_cc_destroy(kcontext, ccache);
+ if (keytab)
+ krb5_kt_close(kcontext, keytab);
krb5_free_context(kcontext);
return ret;
if (gss_conn->server_creds != GSS_C_NO_CREDENTIAL)
gss_release_cred(&minor_status, &gss_conn->server_creds);
+ gss_connection = NULL;
+
return OK;
}
gss_buffer_desc input_token = GSS_C_EMPTY_BUFFER;
OM_uint32 major_status, minor_status, minor_status2;
gss_name_t server_name = GSS_C_NO_NAME;
+ char buf[1024];
+
+ snprintf(buf, sizeof(buf), "%s/%s", conf->krb_service_name, ap_get_server_name(r));
+
+ input_token.value = buf;
+ input_token.length = strlen(buf) + 1;
- if (conf->service_name) {
- input_token.value = conf->service_name;
- input_token.length = strlen(conf->service_name) + 1;
- }
- else {
- input_token.value = "khttp";
- input_token.length = 6;
- }
major_status = gss_import_name(&minor_status, &input_token,
- (conf->service_name) ?
- GSS_C_NT_USER_NAME : GSS_C_NT_HOSTBASED_SERVICE,
+ GSS_C_NT_USER_NAME,
&server_name);
if (GSS_ERROR(major_status)) {
log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
}
static int
+cmp_gss_type(gss_buffer_t token, gss_OID oid)
+{
+ unsigned char *p;
+ size_t len;
+
+ if (token->length == 0)
+ return GSS_S_DEFECTIVE_TOKEN;
+
+ p = token->value;
+ if (*p++ != 0x60)
+ return GSS_S_DEFECTIVE_TOKEN;
+ len = *p++;
+ if (len & 0x80) {
+ if ((len & 0x7f) > 4)
+ return GSS_S_DEFECTIVE_TOKEN;
+ p += len & 0x7f;
+ }
+ if (*p++ != 0x06)
+ return GSS_S_DEFECTIVE_TOKEN;
+
+ if (((OM_uint32) *p++) != oid->length)
+ return GSS_S_DEFECTIVE_TOKEN;
+
+ return memcmp(p, oid->elements, oid->length);
+}
+
+static int
authenticate_user_gss(request_rec *r,
kerb_auth_config *conf,
const char *auth_line)
int ret;
gss_name_t client_name = GSS_C_NO_NAME;
gss_cred_id_t delegated_cred = GSS_C_NO_CREDENTIAL;
+ OM_uint32 (*accept_sec_token)();
+ gss_OID_desc spnego_oid;
+
+ spnego_oid.length = 6;
+ spnego_oid.elements = (void *)"\x2b\x06\x01\x05\x05\x02";
if (gss_connection == NULL) {
gss_connection = ap_pcalloc(r->connection->pool, sizeof(*gss_connection));
ap_register_cleanup(r->connection->pool, gss_connection, cleanup_gss_connection, ap_null_cleanup);
}
- if (conf->krb_5_keytab)
- setenv("KRB5_KTNAME", conf->krb_5_keytab, 1);
+ if (conf->krb_5_keytab) {
+ char *ktname;
+ /* we don't use the ap_* calls here, since the string passed to putenv()
+ * will become part of the enviroment and shouldn't be free()ed by apache
+ */
+ ktname = malloc(strlen("KRB5_KTNAME=") + strlen(conf->krb_5_keytab) + 1);
+ if (ktname == NULL) {
+ log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "malloc() failed: not enough memory");
+ ret = HTTP_INTERNAL_SERVER_ERROR;
+ goto end;
+ }
+ sprintf(ktname, "KRB5_KTNAME=%s", conf->krb_5_keytab);
+ putenv(ktname);
+ }
if (gss_connection->server_creds == GSS_C_NO_CREDENTIAL) {
ret = get_gss_creds(r, conf, &gss_connection->server_creds);
}
input_token.length = ap_base64decode(input_token.value, auth_param);
- major_status = gss_accept_sec_context(&minor_status,
- &gss_connection->context,
- gss_connection->server_creds,
- &input_token,
- GSS_C_NO_CHANNEL_BINDINGS,
- &client_name,
- NULL,
- &output_token,
- NULL,
- NULL,
- &delegated_cred);
+ accept_sec_token = (cmp_gss_type(&input_token, &spnego_oid) == 0) ?
+ gss_accept_sec_context_spnego : gss_accept_sec_context;
+
+ major_status = accept_sec_token(&minor_status,
+ &gss_connection->context,
+ gss_connection->server_creds,
+ &input_token,
+ GSS_C_NO_CHANNEL_BINDINGS,
+ &client_name,
+ NULL,
+ &output_token,
+ NULL,
+ NULL,
+ &delegated_cred);
if (output_token.length) {
char *token = NULL;
size_t len;
ap_base64encode(token, output_token.value, output_token.length);
token[len] = '\0';
ap_table_set(r->err_headers_out, "WWW-Authenticate",
- ap_pstrcat(r->pool, "GSS-Negotiate ", token, NULL));
+ ap_pstrcat(r->pool, "Negotiate ", token, NULL));
gss_release_buffer(&minor_status2, &output_token);
}
gss_release_buffer(&minor_status, &output_token);
-
-#if 0
- /* If the user comes from a realm specified by configuration don't include
- its realm name in the username so that the authorization routine could
- work for both Password-based and Ticket-based authentication. It's
- administrators responsibility to include only such realm that have
- unified principal instances, i.e. if the same principal name occures in
- multiple realms, it must be always assigned to a single user.
- */
- p = strchr(r->connection->user, '@');
- if (p != NULL) {
- const char *realms = conf->gss_krb5_realms;
-
- while (realms && *realms) {
- if (strcmp(p+1, ap_getword_white(r->pool, &realms)) == 0) {
- *p = '\0';
- break;
- }
- }
- }
-#endif
-
ret = OK;
end:
if (client_name != GSS_C_NO_NAME)
gss_release_name(&minor_status, &client_name);
+ cleanup_gss_connection(gss_connection);
+
return ret;
}
#endif /* KRB5 */
+static int
+already_succeeded(request_rec *r)
+{
+ if (ap_is_initial_req(r) || MK_AUTH_TYPE == NULL)
+ return 0;
+ if (strcmp(MK_AUTH_TYPE, "Negotiate") ||
+ (strcmp(MK_AUTH_TYPE, "Basic") && strchr(MK_USER, '@')))
+ return 1;
+ return 0;
+}
static void
-note_kerb_auth_failure(request_rec *r, const kerb_auth_config *conf)
+note_kerb_auth_failure(request_rec *r, const kerb_auth_config *conf,
+ int use_krb4, int use_krb5)
{
const char *auth_name = NULL;
+ int set_basic = 0;
/* get the user realm specified in .htaccess */
auth_name = ap_auth_name(r);
- /* XXX check AuthType */
-
/* XXX should the WWW-Authenticate header be cleared first? */
#ifdef KRB5
- if (conf->krb_method_gssapi)
- ap_table_add(r->err_headers_out, "WWW-Authenticate", "GSS-Negotiate ");
- if (conf->krb_method_k5pass)
+ if (use_krb5 && conf->krb_method_gssapi)
+ ap_table_add(r->err_headers_out, "WWW-Authenticate", "Negotiate");
+ if (use_krb5 && conf->krb_method_k5pass) {
ap_table_add(r->err_headers_out, "WWW-Authenticate",
ap_pstrcat(r->pool, "Basic realm=\"", auth_name, "\"", NULL));
+ set_basic = 1;
+ }
#endif
#ifdef KRB4
- if (conf->krb_method_k4pass)
+ if (use_krb4 && conf->krb_method_k4pass && !set_basic)
ap_table_add(r->err_headers_out, "WWW-Authenticate",
ap_pstrcat(r->pool, "Basic realm=\"", auth_name, "\"", NULL));
#endif
const char *type = NULL;
int use_krb5 = 0, use_krb4 = 0;
int ret;
+ static int last_return = HTTP_UNAUTHORIZED;
/* get the type specified in .htaccess */
type = ap_auth_type(r);
use_krb5 = use_krb4 = 1;
else if(type && strcasecmp(type, "KerberosV5") == 0)
use_krb4 = 0;
- else if (type && strcasecmp(type, "KerberosV4") == 0)
+ else if(type && strcasecmp(type, "KerberosV4") == 0)
use_krb5 = 0;
else
return DECLINED;
/* get what the user sent us in the HTTP header */
auth_line = MK_TABLE_GET(r->headers_in, "Authorization");
if (!auth_line) {
- note_kerb_auth_failure(r, conf);
+ note_kerb_auth_failure(r, conf, use_krb4, use_krb5);
return HTTP_UNAUTHORIZED;
}
auth_type = ap_getword_white(r->pool, &auth_line);
+ if (already_succeeded(r))
+ return last_return;
+
ret = HTTP_UNAUTHORIZED;
#ifdef KRB5
if (use_krb5 && conf->krb_method_gssapi &&
- strcasecmp(auth_type, "GSS-Negotiate") == 0) {
+ strcasecmp(auth_type, "Negotiate") == 0) {
ret = authenticate_user_gss(r, conf, auth_line);
} else if (use_krb5 && conf->krb_method_k5pass &&
strcasecmp(auth_type, "Basic") == 0) {
#endif
if (ret == HTTP_UNAUTHORIZED)
- note_kerb_auth_failure(r, conf);
+ note_kerb_auth_failure(r, conf, use_krb4, use_krb5);
+ last_return = ret;
return ret;
}
NULL /* [ 1] post read_request handling */
};
#else
+static int
+kerb_init_handler(apr_pool_t *p, apr_pool_t *plog,
+ apr_pool_t *ptemp, server_rec *s)
+{
+ ap_add_version_component(p, "mod_auth_kerb/" MODAUTHKERB_VERSION);
+ return OK;
+}
+
void kerb_register_hooks(apr_pool_t *p)
{
+ ap_hook_post_config(kerb_init_handler, NULL, NULL, APR_HOOK_MIDDLE);
ap_hook_check_user_id(kerb_authenticate_user, NULL, NULL, APR_HOOK_MIDDLE);
}
projects / mod_auth_kerb.git / blobdiff