-/***************************************************************************
- Included Headers And Module Declaration
- ***************************************************************************/
-#ifdef APXS1
-#include "httpd.h"
-#include "http_config.h"
-#include "http_core.h"
-#include "http_log.h"
-#include "http_protocol.h"
-#include "http_request.h"
-
-module kerb_auth_module;
+/*
+ * 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>
+ */
+
+/*
+ * Copyright (c) 2004-2006 Masarykova universita
+ * (Masaryk University, Brno, Czech Republic)
+ * 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. Neither the name of the University nor the names of its contributors may
+ * be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT OWNER OR 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.
+ */
+
+#ident "$Id$"
+
+#include "config.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdarg.h>
+
+#define MODAUTHKERB_VERSION "5.1"
+
+#define MECH_NEGOTIATE "Negotiate"
+#define SERVICE_NAME "HTTP"
+
+#include <httpd.h>
+#include <http_config.h>
+#include <http_core.h>
+#include <http_log.h>
+#include <http_protocol.h>
+#include <http_request.h>
+
+#ifdef STANDARD20_MODULE_STUFF
+#include <apr_strings.h>
+#include <apr_base64.h>
#else
-#ifdef APXS2
-#include "apr_strings.h"
-#include "apr_lib.h"
-#include "ap_config.h"
-#include "httpd.h"
-#include "http_config.h"
-#include "http_core.h"
-#include "http_log.h"
-#include "http_protocol.h"
-#include "http_request.h"
-
-module AP_MODULE_DECLARE_DATA kerb_auth_module;
-#endif /* APXS2 */
-#endif /* APXS1 */
+#define apr_pstrdup ap_pstrdup
+#define apr_psprintf ap_psprintf
+#define apr_pstrcat ap_pstrcat
+#define apr_pcalloc ap_pcalloc
+#define apr_table_setn ap_table_setn
+#define apr_table_add ap_table_add
+#define apr_base64_decode_len ap_base64decode_len
+#define apr_base64_decode ap_base64decode
+#define apr_base64_encode_len ap_base64encode_len
+#define apr_base64_encode ap_base64encode
+#define apr_pool_cleanup_null ap_null_cleanup
+#define apr_pool_cleanup_register ap_register_cleanup
+#endif /* STANDARD20_MODULE_STUFF */
+
+#ifdef _WIN32
+#define vsnprintf _vsnprintf
+#define snprintf _snprintf
+#endif
#ifdef KRB5
#include <krb5.h>
+#ifdef HEIMDAL
+# include <gssapi.h>
+#else
+# include <gssapi/gssapi.h>
+# include <gssapi/gssapi_generic.h>
+# include <gssapi/gssapi_krb5.h>
+# define GSS_C_NT_USER_NAME gss_nt_user_name
+# define GSS_C_NT_HOSTBASED_SERVICE gss_nt_service_name
+# define GSS_KRB5_NT_PRINCIPAL_NAME gss_nt_krb5_name
+# define krb5_get_err_text(context,code) error_message(code)
+#endif
+#ifndef GSSAPI_SUPPORTS_SPNEGO
+# include "spnegokrb5.h"
+#endif
#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 */
+#ifndef _WIN32
+/* should be HAVE_UNISTD_H instead */
+#include <unistd.h>
+#endif
-
+#ifdef STANDARD20_MODULE_STUFF
+module AP_MODULE_DECLARE_DATA auth_kerb_module;
+#else
+module auth_kerb_module;
+#endif
/***************************************************************************
Macros To Ease Compatibility
***************************************************************************/
-#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_PROXY STD_PROXY
-#define MK_USER r->connection->user
-#define MK_AUTH_TYPE r->connection->ap_auth_type
-#define MK_ARRAY_HEADER array_header
-#else
-#ifdef APXS2
+#ifdef STANDARD20_MODULE_STUFF
#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_PROXY PROXYREQ_PROXY
#define MK_USER r->user
#define MK_AUTH_TYPE r->ap_auth_type
-#define MK_ARRAY_HEADER apr_array_header_t
-#endif /* APXS2 */
-#endif /* APXS1 */
-
-
-
+#else
+#define MK_POOL pool
+#define MK_TABLE_GET ap_table_get
+#define MK_USER r->connection->user
+#define MK_AUTH_TYPE r->connection->ap_auth_type
+#define PROXYREQ_PROXY STD_PROXY
+#endif
/***************************************************************************
Auth Configuration Structure
***************************************************************************/
typedef struct {
- char *krb_auth_type;
-#ifdef KRB4
- char *krb_4_srvtab;
-#endif /* KRB4 */
-#ifdef KRB5
- char *krb_5_keytab;
-#endif /* KRB5 */
+ char *krb_auth_realms;
+ int krb_save_credentials;
+ int krb_verify_kdc;
+ const char *krb_service_name;
int krb_authoritative;
- char *krb_default_realm;
- int krb_fail_status;
- char *krb_force_instance;
+ int krb_delegate_basic;
+#if 0
+ int krb_ssl_preauthentication;
+#endif
#ifdef KRB5
- int krb_forwardable;
-#endif /* KRB5 */
- char *krb_lifetime;
-#ifdef KRB5
- char *krb_renewable;
-#endif /* KRB5 */
- int krb_save_credentials;
- char *krb_tmp_dir;
+ char *krb_5_keytab;
+ int krb_method_gssapi;
+ int krb_method_k5pass;
+#endif
+#ifdef KRB4
+ char *krb_4_srvtab;
+ int krb_method_k4pass;
+#endif
} kerb_auth_config;
+static void
+set_kerb_auth_headers(request_rec *r, const kerb_auth_config *conf,
+ int use_krb4, int use_krb5pwd, char *negotiate_ret_value);
+static const char*
+krb5_save_realms(cmd_parms *cmd, void *sec, const char *arg);
+#ifdef STANDARD20_MODULE_STUFF
+#define command(name, func, var, type, usage) \
+ AP_INIT_ ## type (name, (void*) func, \
+ (void*)APR_OFFSETOF(kerb_auth_config, var), \
+ OR_AUTHCFG | RSRC_CONF, usage)
+#else
+#define command(name, func, var, type, usage) \
+ { name, func, \
+ (void*)XtOffsetOf(kerb_auth_config, var), \
+ OR_AUTHCFG | RSRC_CONF, type, usage }
+#endif
-/***************************************************************************
- Auth Configuration Initialization
- ***************************************************************************/
-static void *kerb_dir_config(MK_POOL *p, char *d)
+static const command_rec kerb_auth_cmds[] = {
+ command("KrbAuthRealms", krb5_save_realms, krb_auth_realms,
+ RAW_ARGS, "Realms to attempt authentication against (can be multiple)."),
+
+ 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("KrbVerifyKDC", ap_set_flag_slot, krb_verify_kdc,
+ FLAG, "Verify tickets against keytab to prevent KDC spoofing attacks."),
+
+ command("KrbServiceName", ap_set_string_slot, krb_service_name,
+ TAKE1, "Full or partial service name to be used by Apache for authentication."),
+
+ command("KrbAuthoritative", ap_set_flag_slot, krb_authoritative,
+ FLAG, "Set to 'off' to allow access control to be passed along to lower modules iff the UserID is not known to this module."),
+
+ command("KrbDelegateBasic", ap_set_flag_slot, krb_delegate_basic,
+ FLAG, "Always offer Basic authentication regardless of KrbMethodK5Pass and pass on authentication to lower modules if Basic headers arrive."),
+
+#if 0
+ command("KrbEnableSSLPreauthentication", ap_set_flag_slot, krb_ssl_preauthentication,
+ FLAG, "Don't do Kerberos authentication if the user is already authenticated using SSL and her client certificate."),
+#endif
+
+#ifdef KRB5
+ command("Krb5Keytab", ap_set_file_slot, krb_5_keytab,
+ TAKE1, "Location of Kerberos V5 keytab file."),
+
+ command("KrbMethodNegotiate", ap_set_flag_slot, krb_method_gssapi,
+ FLAG, "Enable Negotiate authentication method."),
+
+ command("KrbMethodK5Passwd", ap_set_flag_slot, krb_method_k5pass,
+ FLAG, "Enable Kerberos V5 password authentication."),
+#endif
+
+#ifdef KRB4
+ command("Krb4Srvtab", ap_set_file_slot, krb_4_srvtab,
+ TAKE1, "Location of Kerberos V4 srvtab file."),
+
+ command("KrbMethodK4Passwd", ap_set_flag_slot, krb_method_k4pass,
+ FLAG, "Enable Kerberos V4 password authentication."),
+#endif
+
+ { NULL }
+};
+
+#ifdef _WIN32
+int
+mkstemp(char *template)
{
- static void *rec;
- rec = (void *) ap_pcalloc(p, sizeof(kerb_auth_config));
- ((kerb_auth_config *)rec)->krb_fail_status = HTTP_UNAUTHORIZED;
- ((kerb_auth_config *)rec)->krb_authoritative = 0;
- ((kerb_auth_config *)rec)->krb_auth_type = MK_PSTRDUP(p, "None");
- return rec;
+ int start, i;
+ pid_t val;
+ val = getpid();
+ start = strlen(template) - 1;
+ while(template[start] == 'X') {
+ template[start] = '0' + val % 10;
+ val /= 10;
+ start--;
+ }
+
+ do{
+ int fd;
+ fd = open(template, O_RDWR | O_CREAT | O_EXCL, 0600);
+ if(fd >= 0 || errno != EEXIST)
+ return fd;
+ i = start + 1;
+ do{
+ if(template[i] == 0)
+ return -1;
+ template[i]++;
+ if(template[i] == '9' + 1)
+ template[i] = 'a';
+ if(template[i] <= 'z')
+ break;
+ template[i] = 'a';
+ i++;
+ }while(1);
+ }while(1);
}
+#endif
+
+#if defined(KRB5) && !defined(HEIMDAL)
+/* Needed to work around problems with replay caches */
+#include "mit-internals.h"
+/* This is our replacement krb5_rc_store function */
+static krb5_error_code KRB5_LIB_FUNCTION
+mod_auth_kerb_rc_store(krb5_context context, krb5_rcache rcache,
+ krb5_donot_replay_internal *donot_replay)
+{
+ return 0;
+}
+/* And this is the operations vector for our replay cache */
+const krb5_rc_ops_internal mod_auth_kerb_rc_ops = {
+ 0,
+ "dfl",
+ krb5_rc_dfl_init,
+ krb5_rc_dfl_recover,
+ krb5_rc_dfl_destroy,
+ krb5_rc_dfl_close,
+ mod_auth_kerb_rc_store,
+ krb5_rc_dfl_expunge,
+ krb5_rc_dfl_get_span,
+ krb5_rc_dfl_get_name,
+ krb5_rc_dfl_resolve
+};
+#endif
/***************************************************************************
- Auth Configuration Parsers
+ Auth Configuration Initialization
***************************************************************************/
-static const char *kerb_set_fail_slot(cmd_parms *cmd, void *struct_ptr,
- const char *arg)
+static void *kerb_dir_create_config(MK_POOL *p, char *d)
{
- 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;
+ kerb_auth_config *rec;
+
+ rec = (kerb_auth_config *) apr_pcalloc(p, sizeof(kerb_auth_config));
+ ((kerb_auth_config *)rec)->krb_verify_kdc = 1;
+ ((kerb_auth_config *)rec)->krb_service_name = NULL;
+ ((kerb_auth_config *)rec)->krb_authoritative = 1;
+ ((kerb_auth_config *)rec)->krb_delegate_basic = 0;
+#if 0
+ ((kerb_auth_config *)rec)->krb_ssl_preauthentication = 0;
+#endif
+#ifdef KRB5
+ ((kerb_auth_config *)rec)->krb_method_k5pass = 1;
+ ((kerb_auth_config *)rec)->krb_method_gssapi = 1;
+#endif
+#ifdef KRB4
+ ((kerb_auth_config *)rec)->krb_method_k4pass = 1;
+#endif
+ return rec;
}
-/* these are either char *struct_ptr, char *arg or void *struct_ptr, const char *arg */
-static const char *kerb_set_type_slot(cmd_parms *cmd, void *struct_ptr,
- const char *arg)
+static const char*
+krb5_save_realms(cmd_parms *cmd, void *vsec, const char *arg)
{
- int offset = (int) (long) cmd->info;
- if
-#ifdef KRB5
- (!strncasecmp(arg, "v5", 2))
- *(char **) ((char *)struct_ptr + offset) = MK_PSTRDUP(cmd->pool, "KerberosV5");
- else if
-#endif /* KRB5 */
-#ifdef KRB4
- (!strncasecmp(arg, "v4", 2))
- *(char **) ((char *)struct_ptr + offset) = MK_PSTRDUP(cmd->pool, "KerberosV4");
-#endif /* KRB4 */
- else if
- (!strncasecmp(arg, "dualv5v4", 8))
- *(char **) ((char *)struct_ptr + offset) = MK_PSTRDUP(cmd->pool, "KerberosDualV5V4");
- else if
- (!strncasecmp(arg, "dualv4v5", 8))
- *(char **) ((char *)struct_ptr + offset) = MK_PSTRDUP(cmd->pool, "KerberosDualV4V5");
-#if defined(KRB4) && defined(KRB5)
-#endif /* KRB4 && KRB5 */
- else
- return "AuthKerberos must be V5, V4, DualV4V5, or DualV5V4.";
- return NULL;
+ kerb_auth_config *sec = (kerb_auth_config *) vsec;
+ sec->krb_auth_realms= apr_pstrdup(cmd->pool, arg);
+ return NULL;
}
+static void
+log_rerror(const char *file, int line, int level, int status,
+ const request_rec *r, const char *fmt, ...)
+{
+ char errstr[1024];
+ va_list ap;
+ va_start(ap, fmt);
+ vsnprintf(errstr, sizeof(errstr), fmt, ap);
+ va_end(ap);
+
+#ifdef STANDARD20_MODULE_STUFF
+ ap_log_rerror(file, line, level | APLOG_NOERRNO, status, r, "%s", errstr);
+#else
+ ap_log_rerror(file, line, level | APLOG_NOERRNO, r, "%s", errstr);
+#endif
+}
+#ifdef KRB4
/***************************************************************************
- Auth Configuration Commands
+ Username/Password Validation for Krb4
***************************************************************************/
-#ifdef APXS1
-command_rec kerb_auth_cmds[] = {
- {
- "AuthKerberos",
- kerb_set_type_slot,
- (void*)XtOffsetOf(kerb_auth_config, krb_auth_type),
- OR_AUTHCFG,
- TAKE1,
- "Permit Kerberos auth without AuthType requirement."
- },
+static int
+verify_krb4_user(request_rec *r, const char *name, const char *instance,
+ const char *realm, const char *password, const char *linstance, const char *srvtab, int krb_verify_kdc)
+{
+ 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, (char *)linstance, phost, addr, &authdata, (char *)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;
+}
-#ifdef KRB4
- {
- "Krb4Srvtab",
- ap_set_file_slot,
- (void*)XtOffsetOf(kerb_auth_config, krb_4_srvtab),
- RSRC_CONF & ACCESS_CONF,
- TAKE1,
- "Location of Kerberos V4 srvtab file."
- },
+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, ':');
+
+ 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 = apr_pstrdup(r->pool, tkt_file);
+ apr_pool_cleanup_register(r->pool, tkt_file_p, krb4_cache_cleanup,
+ apr_pool_cleanup_null);
+
+ 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);
+ if (ret)
+ break;
+ realm = lrealm;
+ }
+
+ /* XXX conf->krb_service_name */
+ 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 = apr_pstrdup(r->pool, sent_name);
+ if (sent_instance)
+ user = apr_pstrcat(r->pool, user, ".", sent_instance, NULL);
+ user = apr_pstrcat(r->pool, user, "@", realm, NULL);
+
+ MK_USER = user;
+ MK_AUTH_TYPE = "Basic";
+ apr_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 */
#ifdef KRB5
- {
- "Krb5Keytab",
- ap_set_file_slot,
- (void*)XtOffsetOf(kerb_auth_config, krb_5_keytab),
- RSRC_CONF & ACCESS_CONF,
- TAKE1,
- "Location of Kerberos V5 keytab file."
- },
-#endif /* KRB5 */
+/***************************************************************************
+ Username/Password Validation for Krb5
+ ***************************************************************************/
- {
- "KrbAuthoritative",
- ap_set_flag_slot,
- (void*)XtOffsetOf(kerb_auth_config, krb_authoritative),
- OR_AUTHCFG,
- FLAG,
- "Refuse to pass request down to lower modules."
- },
-
- {
- "KrbDefaultRealm",
- ap_set_string_slot,
- (void*)XtOffsetOf(kerb_auth_config, krb_default_realm),
- OR_AUTHCFG,
- TAKE1,
- "Default realm to authenticate users against."
- },
-
- {
- "KrbFailStatus",
- kerb_set_fail_slot,
- (void*)XtOffsetOf(kerb_auth_config, krb_fail_status),
- OR_AUTHCFG,
- TAKE1,
- "If auth fails, return status set here."
- },
-
- {
- "KrbForceInstance",
- ap_set_string_slot,
- (void*)XtOffsetOf(kerb_auth_config, krb_force_instance),
- OR_AUTHCFG,
- TAKE1,
- "Force authentication against an instance specified here."
- },
+/* MIT kerberos uses replay cache checks even during credential verification
+ * (i.e. in krb5_verify_init_creds()), which is obviosuly useless. In order to
+ * avoid problems with multiple apache processes accessing the same rcache file
+ * we had to use this call instead, which is only a bit modified version of
+ * krb5_verify_init_creds() */
+static krb5_error_code
+verify_krb5_init_creds(request_rec *r, krb5_context context, krb5_creds *creds,
+ krb5_principal ap_req_server, krb5_keytab ap_req_keytab)
+{
+ krb5_error_code ret;
+ krb5_data req;
+ krb5_ccache local_ccache = NULL;
+ krb5_creds *new_creds = NULL;
+ krb5_auth_context auth_context = NULL;
+ krb5_keytab keytab = NULL;
+ char *server_name;
+
+ memset(&req, 0, sizeof(req));
+
+ if (ap_req_keytab == NULL) {
+ ret = krb5_kt_default (context, &keytab);
+ if (ret)
+ return ret;
+ } else
+ keytab = ap_req_keytab;
+
+ ret = krb5_cc_resolve(context, "MEMORY:", &local_ccache);
+ if (ret) {
+ log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
+ "krb5_cc_resolve() failed when verifying KDC");
+ return ret;
+ }
+
+ ret = krb5_cc_initialize(context, local_ccache, creds->client);
+ if (ret) {
+ log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
+ "krb5_cc_initialize() failed when verifying KDC");
+ goto end;
+ }
+
+ ret = krb5_cc_store_cred (context, local_ccache, creds);
+ if (ret) {
+ log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
+ "krb5_cc_initialize() failed when verifying KDC");
+ goto end;
+ }
+
+ ret = krb5_unparse_name(context, ap_req_server, &server_name);
+ if (ret) {
+ log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
+ "krb5_unparse_name() failed when verifying KDC");
+ goto end;
+ }
+ log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
+ "Trying to verify authenticity of KDC using principal %s", server_name);
+ free(server_name);
+
+ if (!krb5_principal_compare (context, ap_req_server, creds->server)) {
+ krb5_creds match_cred;
+
+ memset (&match_cred, 0, sizeof(match_cred));
+
+ match_cred.client = creds->client;
+ match_cred.server = ap_req_server;
+
+ ret = krb5_get_credentials (context, 0, local_ccache,
+ &match_cred, &new_creds);
+ if (ret) {
+ log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
+ "krb5_get_credentials() failed when verifying KDC");
+ goto end;
+ }
+ creds = new_creds;
+ }
+
+ ret = krb5_mk_req_extended (context, &auth_context, 0, NULL, creds, &req);
+ if (ret) {
+ log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
+ "krb5_mk_req_extended() failed when verifying KDC");
+ goto end;
+ }
+
+ krb5_auth_con_free (context, auth_context);
+ auth_context = NULL;
+ ret = krb5_auth_con_init(context, &auth_context);
+ if (ret) {
+ log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
+ "krb5_auth_con_init() failed when verifying KDC");
+ goto end;
+ }
+ /* use KRB5_AUTH_CONTEXT_DO_SEQUENCE to skip replay cache checks */
+ krb5_auth_con_setflags(context, auth_context, KRB5_AUTH_CONTEXT_DO_SEQUENCE);
+
+ ret = krb5_rd_req (context, &auth_context, &req, ap_req_server,
+ keytab, 0, NULL);
+ if (ret) {
+ log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
+ "krb5_rd_req() failed when verifying KDC");
+ goto end;
+ }
+
+end:
+#ifdef HEIMDAL
+ /* XXX Do I ever want to support Heimdal 0.4 ??? */
+ krb5_data_free(&req);
+#else
+ krb5_free_data_contents(context, &req);
+#endif
+ if (auth_context)
+ krb5_auth_con_free (context, auth_context);
+ if (new_creds)
+ krb5_free_creds (context, new_creds);
+ if (ap_req_keytab == NULL && keytab)
+ krb5_kt_close (context, keytab);
+ if (local_ccache)
+ krb5_cc_destroy (context, local_ccache);
+
+ return ret;
+}
-#ifdef KRB5
- {
- "KrbForwardable",
- ap_set_flag_slot,
- (void*)XtOffsetOf(kerb_auth_config, krb_forwardable),
- OR_AUTHCFG,
- FLAG,
- "Credentials retrieved will be flagged as forwardable."
- },
-#endif /* KRB5 */
+/* Inspired by krb5_verify_user from Heimdal */
+static krb5_error_code
+verify_krb5_user(request_rec *r, krb5_context context, krb5_principal principal,
+ const char *password, krb5_principal server,
+ krb5_keytab keytab, int krb_verify_kdc, krb5_ccache *ccache)
+{
+ krb5_creds creds;
+ krb5_error_code ret;
+ krb5_ccache ret_ccache = NULL;
+ char *name = NULL;
+
+ /* XXX error messages shouldn't be logged here (and in the while() loop in
+ * authenticate_user_krb5pwd() as weell), in order to avoid confusing log
+ * entries when using multiple realms */
+
+ memset(&creds, 0, sizeof(creds));
+
+ ret = krb5_unparse_name(context, principal, &name);
+ if (ret == 0) {
+ log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
+ "Trying to get TGT for user %s", name);
+ free(name);
+ }
+
+ ret = krb5_get_init_creds_password(context, &creds, principal,
+ (char *)password, NULL,
+ NULL, 0, NULL, NULL);
+ if (ret) {
+ log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
+ "krb5_get_init_creds_password() failed: %s",
+ krb5_get_err_text(context, ret));
+ goto end;
+ }
+
+ /* XXX
+ {
+ char *realm;
+
+ krb5_get_default_realm(context, &realm);
+ log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
+ "trying to verify password using key for %s/%s@%s",
+ service, ap_get_server_name(r), realm);
+ }
+ */
+
+ if (krb_verify_kdc &&
+ (ret = verify_krb5_init_creds(r, context, &creds, server, keytab))) {
+ log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
+ "failed to verify krb5 credentials: %s",
+ krb5_get_err_text(context, ret));
+ goto end;
+ }
+
+ ret = krb5_cc_resolve(context, "MEMORY:", &ret_ccache);
+ if (ret) {
+ log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
+ "generating new memory ccache failed: %s",
+ krb5_get_err_text(context, ret));
+ goto end;
+ }
+
+ ret = krb5_cc_initialize(context, ret_ccache, principal);
+ if (ret) {
+ log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
+ "krb5_cc_initialize() failed: %s",
+ krb5_get_err_text(context, ret));
+ goto end;
+ }
+
+ ret = krb5_cc_store_cred(context, ret_ccache, &creds);
+ if (ret) {
+ log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
+ "krb5_cc_store_cred() failed: %s",
+ krb5_get_err_text(context, ret));
+ goto end;
+ }
+ *ccache = ret_ccache;
+ ret_ccache = NULL;
+
+end:
+ krb5_free_cred_contents(context, &creds);
+ if (ret_ccache)
+ krb5_cc_destroy(context, ret_ccache);
+
+ return ret;
+}
- {
- "KrbLifetime",
- ap_set_string_slot,
- (void*)XtOffsetOf(kerb_auth_config, krb_lifetime),
- OR_AUTHCFG,
- TAKE1,
- "Lifetime of tickets retrieved."
- },
+static int
+krb5_cache_cleanup(void *data)
+{
+ krb5_context context;
+ krb5_ccache cache;
+ krb5_error_code problem;
+ char *cache_name = (char *) data;
+
+ problem = krb5_init_context(&context);
+ if (problem) {
+ /* ap_log_error(APLOG_MARK, APLOG_ERR, 0, NULL, "krb5_init_context() failed"); */
+ return HTTP_INTERNAL_SERVER_ERROR;
+ }
+
+ problem = krb5_cc_resolve(context, cache_name, &cache);
+ if (problem) {
+ /* log_error(APLOG_MARK, APLOG_ERR, 0, NULL,
+ "krb5_cc_resolve() failed (%s: %s)",
+ cache_name, krb5_get_err_text(context, problem)); */
+ return HTTP_INTERNAL_SERVER_ERROR;
+ }
+
+ krb5_cc_destroy(context, cache);
+ krb5_free_context(context);
+ return OK;
+}
-#ifdef KRB5
- {
- "KrbRenewable",
- ap_set_string_slot,
- (void*)XtOffsetOf(kerb_auth_config, krb_renewable),
- OR_AUTHCFG,
- TAKE1,
- "Credentials retrieved will be renewable for this length."
- },
-#endif /* KRB5 */
+static int
+create_krb5_ccache(krb5_context kcontext,
+ request_rec *r,
+ kerb_auth_config *conf,
+ krb5_principal princ,
+ krb5_ccache *ccache)
+{
+ char *ccname;
+ int fd;
+ krb5_error_code problem;
+ int ret;
+ krb5_ccache tmp_ccache = NULL;
+
+ ccname = apr_psprintf(r->pool, "FILE:%s/krb5cc_apache_XXXXXX", P_tmpdir);
+ fd = mkstemp(ccname + strlen("FILE:"));
+ if (fd < 0) {
+ log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
+ "mkstemp() failed: %s", strerror(errno));
+ ret = HTTP_INTERNAL_SERVER_ERROR;
+ goto end;
+ }
+ close(fd);
+
+ problem = krb5_cc_resolve(kcontext, ccname, &tmp_ccache);
+ if (problem) {
+ log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
+ "krb5_cc_resolve() failed: %s",
+ krb5_get_err_text(kcontext, problem));
+ ret = HTTP_INTERNAL_SERVER_ERROR;
+ unlink(ccname);
+ goto end;
+ }
+
+ 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;
+ }
+
+ apr_table_setn(r->subprocess_env, "KRB5CCNAME", ccname);
+ apr_pool_cleanup_register(r->pool, ccname, krb5_cache_cleanup,
+ apr_pool_cleanup_null);
+
+ *ccache = tmp_ccache;
+ tmp_ccache = NULL;
+
+ ret = OK;
+
+end:
+ if (tmp_ccache)
+ krb5_cc_destroy(kcontext, tmp_ccache);
+
+ return ret;
+}
- {
- "KrbSaveCredentials",
- ap_set_flag_slot,
- (void*)XtOffsetOf(kerb_auth_config, krb_save_credentials),
- OR_AUTHCFG,
- FLAG,
- "Save and store credentials/tickets retrieved during auth."
- },
-
- {
- "KrbSaveTickets",
- ap_set_flag_slot,
- (void*)XtOffsetOf(kerb_auth_config, krb_save_credentials),
- OR_AUTHCFG,
- FLAG,
- "Alias for KrbSaveCredentials."
- },
-
- {
- "KrbTmpdir",
- ap_set_string_slot,
- (void*)XtOffsetOf(kerb_auth_config, krb_tmp_dir),
- RSRC_CONF & ACCESS_CONF,
- TAKE1,
- "Path to store ticket files and such in."
- },
-
- { NULL }
-};
+static int
+store_krb5_creds(krb5_context kcontext,
+ request_rec *r,
+ kerb_auth_config *conf,
+ krb5_ccache delegated_cred)
+{
+ char errstr[1024];
+ krb5_error_code problem;
+ krb5_principal princ;
+ krb5_ccache ccache;
+ int ret;
+
+ problem = krb5_cc_get_principal(kcontext, delegated_cred, &princ);
+ if (problem) {
+ snprintf(errstr, sizeof(errstr), "krb5_cc_get_principal() failed: %s",
+ krb5_get_err_text(kcontext, problem));
+ return HTTP_INTERNAL_SERVER_ERROR;
+ }
+
+ ret = create_krb5_ccache(kcontext, r, conf, princ, &ccache);
+ if (ret) {
+ krb5_free_principal(kcontext, princ);
+ return ret;
+ }
+
+#ifdef HEIMDAL
+ problem = krb5_cc_copy_cache(kcontext, delegated_cred, ccache);
#else
-#ifdef APXS2
-static const command_rec kerb_auth_cmds[] = {
- AP_INIT_TAKE1(
- "AuthKerberos",
- kerb_set_type_slot,
- (void*)APR_XtOffsetOf(kerb_auth_config, krb_auth_type),
- OR_AUTHCFG,
- "Permit Kerberos auth without AuthType requirement."
- ),
-
-#ifdef KRB4
- AP_INIT_TAKE1(
- "Krb4Srvtab",
- ap_set_file_slot,
- (void*)APR_XtOffsetOf(kerb_auth_config, krb_4_srvtab),
- RSRC_CONF & ACCESS_CONF,
- "Location of Kerberos V4 srvtab file."
- ),
-#endif /* KRB4 */
-
-#ifdef KRB5
- AP_INIT_TAKE1(
- "Krb5Keytab",
- ap_set_file_slot,
- (void*)APR_XtOffsetOf(kerb_auth_config, krb_5_keytab),
- RSRC_CONF & ACCESS_CONF,
- "Location of Kerberos V5 keytab file."
- ),
-#endif /* KRB5 */
+ problem = krb5_cc_copy_creds(kcontext, delegated_cred, ccache);
+#endif
+ krb5_free_principal(kcontext, princ);
+ if (problem) {
+ 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;
+ }
+
+ krb5_cc_close(kcontext, ccache);
+ return OK;
+}
- AP_INIT_FLAG(
- "KrbAuthoritative",
- ap_set_flag_slot,
- (void*)APR_XtOffsetOf(kerb_auth_config, krb_authoritative),
- OR_AUTHCFG,
- "Refuse to pass request down to lower modules."
- ),
-
- AP_INIT_TAKE1(
- "KrbDefaultRealm",
- ap_set_string_slot,
- (void*)APR_XtOffsetOf(kerb_auth_config, krb_default_realm),
- OR_AUTHCFG,
- "Default realm to authenticate users against."
- ),
-
- AP_INIT_TAKE1(
- "KrbFailStatus",
- kerb_set_fail_slot,
- (void*)APR_XtOffsetOf(kerb_auth_config, krb_fail_status),
- OR_AUTHCFG,
- "If auth fails, return status set here."
- ),
-
- AP_INIT_TAKE1(
- "KrbForceInstance",
- ap_set_string_slot,
- (void*)APR_XtOffsetOf(kerb_auth_config, krb_force_instance),
- OR_AUTHCFG,
- "Force authentication against an instance specified here."
- ),
-#ifdef KRB5
- AP_INIT_FLAG(
- "KrbForwardable",
- ap_set_flag_slot,
- (void*)APR_XtOffsetOf(kerb_auth_config, krb_forwardable),
- OR_AUTHCFG,
- "Credentials retrieved will be flagged as forwardable."
- ),
-#endif /* KRB5 */
-
- AP_INIT_TAKE1(
- "KrbLifetime",
- ap_set_string_slot,
- (void*)APR_XtOffsetOf(kerb_auth_config, krb_lifetime),
- OR_AUTHCFG,
- "Lifetime of tickets retrieved."
- ),
+static int
+authenticate_user_krb5pwd(request_rec *r,
+ kerb_auth_config *conf,
+ const char *auth_line)
+{
+ const char *sent_pw = NULL;
+ const char *sent_name = NULL;
+ const char *realms = NULL;
+ const char *realm = NULL;
+ krb5_context kcontext = NULL;
+ krb5_error_code code;
+ krb5_principal client = NULL;
+ krb5_principal server = NULL;
+ krb5_ccache ccache = NULL;
+ krb5_keytab keytab = NULL;
+ int ret;
+ char *name = NULL;
+ int all_principals_unkown;
+ char *p = NULL;
+
+ code = krb5_init_context(&kcontext);
+ if (code) {
+ log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
+ "Cannot initialize Kerberos5 context (%d)", code);
+ return HTTP_INTERNAL_SERVER_ERROR;
+ }
+
+ sent_pw = ap_pbase64decode(r->pool, auth_line);
+ sent_name = ap_getword (r->pool, &sent_pw, ':');
+
+ if (sent_pw == NULL || *sent_pw == '\0') {
+ log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
+ "empty passwords are not accepted");
+ ret = HTTP_UNAUTHORIZED;
+ goto end;
+ }
+
+ if (conf->krb_5_keytab)
+ krb5_kt_resolve(kcontext, conf->krb_5_keytab, &keytab);
+
+ if (conf->krb_service_name && strchr(conf->krb_service_name, '/') != NULL)
+ ret = krb5_parse_name (kcontext, conf->krb_service_name, &server);
+ else
+ ret = krb5_sname_to_principal(kcontext, ap_get_server_name(r),
+ (conf->krb_service_name) ? conf->krb_service_name : SERVICE_NAME,
+ KRB5_NT_SRV_HST, &server);
+
+ if (ret) {
+ log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
+ "Error parsing server name (%s): %s",
+ (conf->krb_service_name) ? conf->krb_service_name : SERVICE_NAME,
+ krb5_get_err_text(kcontext, ret));
+ ret = HTTP_UNAUTHORIZED;
+ goto end;
+ }
+
+ code = krb5_unparse_name(kcontext, server, &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;
+ }
+ log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, "Using %s as server principal for password verification", name);
+ free(name);
+ name = NULL;
+
+ p = strchr(sent_name, '@');
+ if (p) {
+ *p++ = '\0';
+ if (conf->krb_auth_realms && !ap_find_token(r->pool, conf->krb_auth_realms, p)) {
+ log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
+ "Specified realm `%s' not allowed by configuration", p);
+ ret = HTTP_UNAUTHORIZED;
+ goto end;
+ }
+ }
+
+ realms = (p) ? p : conf->krb_auth_realms;
+ all_principals_unkown = 1;
+ do {
+ name = (char *) sent_name;
+ if (realms && (realm = ap_getword_white(r->pool, &realms)))
+ name = apr_psprintf(r->pool, "%s@%s", sent_name, realm);
+
+ if (client) {
+ krb5_free_principal(kcontext, client);
+ client = NULL;
+ }
+
+ code = krb5_parse_name(kcontext, name, &client);
+ if (code) {
+ log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
+ "krb5_parse_name() failed: %s",
+ krb5_get_err_text(kcontext, code));
+ continue;
+ }
+
+ code = verify_krb5_user(r, kcontext, client, sent_pw,
+ server, keytab, conf->krb_verify_kdc, &ccache);
+ 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;
+
+ /* ap_getword_white() used above shifts the parameter, so it's not
+ needed to touch the realms variable */
+ } while (realms && *realms);
+
+ memset((char *)sent_pw, 0, strlen(sent_pw));
+
+ if (code) {
+ if (!conf->krb_authoritative && all_principals_unkown == 1 && code == KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN)
+ ret = DECLINED;
+ else
+ ret = HTTP_UNAUTHORIZED;
+
+ 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 = apr_pstrdup (r->pool, name);
+ MK_AUTH_TYPE = "Basic";
+ free(name);
+
+ if (conf->krb_save_credentials)
+ store_krb5_creds(kcontext, r, conf, ccache);
+
+ ret = OK;
+
+end:
+ log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
+ "kerb_authenticate_user_krb5pwd ret=%d user=%s authtype=%s",
+ ret, (MK_USER)?MK_USER:"(NULL)", (MK_AUTH_TYPE)?MK_AUTH_TYPE:"(NULL)");
+ if (client)
+ krb5_free_principal(kcontext, client);
+ if (server)
+ krb5_free_principal(kcontext, server);
+ if (ccache)
+ krb5_cc_destroy(kcontext, ccache);
+ if (keytab)
+ krb5_kt_close(kcontext, keytab);
+ krb5_free_context(kcontext);
+
+ return ret;
+}
-#ifdef KRB5
- AP_INIT_TAKE1(
- "KrbRenewable",
- ap_set_string_slot,
- (void*)APR_XtOffsetOf(kerb_auth_config, krb_renewable),
- OR_AUTHCFG,
- "Credentials retrieved will be renewable for this length."
- ),
-#endif /* KRB5 */
+/*********************************************************************
+ * GSSAPI Authentication
+ ********************************************************************/
- AP_INIT_FLAG(
- "KrbSaveCredentials",
- ap_set_flag_slot,
- (void*)APR_XtOffsetOf(kerb_auth_config, krb_save_credentials),
- OR_AUTHCFG,
- "Save and store credentials/tickets retrieved during auth."
- ),
-
- AP_INIT_FLAG(
- "KrbSaveTickets",
- ap_set_flag_slot,
- (void*)APR_XtOffsetOf(kerb_auth_config, krb_save_credentials),
- OR_AUTHCFG,
- "Alias for KrbSaveCredentials."
- ),
-
- AP_INIT_TAKE1(
- "KrbTmpdir",
- ap_set_string_slot,
- (void*)APR_XtOffsetOf(kerb_auth_config, krb_tmp_dir),
- RSRC_CONF & ACCESS_CONF,
- "Path to store ticket files and such in."
- ),
-
- { NULL }
-};
-#endif /* APXS2 */
-#endif /* APXS1 */
+static const char *
+get_gss_error(MK_POOL *p, OM_uint32 err_maj, OM_uint32 err_min, char *prefix)
+{
+ OM_uint32 maj_stat, min_stat;
+ OM_uint32 msg_ctx = 0;
+ gss_buffer_desc status_string;
+ char *err_msg;
+
+ err_msg = apr_pstrdup(p, prefix);
+ do {
+ maj_stat = gss_display_status (&min_stat,
+ err_maj,
+ GSS_C_GSS_CODE,
+ GSS_C_NO_OID,
+ &msg_ctx,
+ &status_string);
+ if (GSS_ERROR(maj_stat))
+ break;
+ err_msg = apr_pstrcat(p, err_msg, ": ", (char*) status_string.value, NULL);
+ gss_release_buffer(&min_stat, &status_string);
+
+ maj_stat = gss_display_status (&min_stat,
+ err_min,
+ GSS_C_MECH_CODE,
+ GSS_C_NULL_OID,
+ &msg_ctx,
+ &status_string);
+ if (!GSS_ERROR(maj_stat)) {
+ err_msg = apr_pstrcat(p, err_msg,
+ " (", (char*) status_string.value, ")", NULL);
+ gss_release_buffer(&min_stat, &status_string);
+ }
+ } while (!GSS_ERROR(maj_stat) && msg_ctx != 0);
+
+ return err_msg;
+}
+static int
+store_gss_creds(request_rec *r, kerb_auth_config *conf, char *princ_name,
+ gss_cred_id_t delegated_cred)
+{
+ OM_uint32 maj_stat, min_stat;
+ krb5_principal princ = NULL;
+ krb5_ccache ccache = NULL;
+ krb5_error_code problem;
+ krb5_context context;
+ int ret = HTTP_INTERNAL_SERVER_ERROR;
+
+ problem = krb5_init_context(&context);
+ if (problem) {
+ log_rerror(APLOG_MARK, APLOG_ERR, 0, r, "Cannot initialize krb5 context");
+ return HTTP_INTERNAL_SERVER_ERROR;
+ }
+
+ problem = krb5_parse_name(context, princ_name, &princ);
+ if (problem) {
+ log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
+ "Cannot parse delegated username (%s)", krb5_get_err_text(context, problem));
+ goto end;
+ }
+
+ problem = create_krb5_ccache(context, r, conf, princ, &ccache);
+ if (problem) {
+ log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
+ "Cannot create krb5 ccache (%s)", krb5_get_err_text(context, problem));
+ goto end;
+ }
+
+ maj_stat = gss_krb5_copy_ccache(&min_stat, delegated_cred, ccache);
+ if (GSS_ERROR(maj_stat)) {
+ log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
+ "Cannot store delegated credential (%s)",
+ get_gss_error(r->pool, maj_stat, min_stat, "gss_krb5_copy_ccache"));
+ goto end;
+ }
+
+ krb5_cc_close(context, ccache);
+ ccache = NULL;
+ ret = 0;
+
+end:
+ if (princ)
+ krb5_free_principal(context, princ);
+ if (ccache)
+ krb5_cc_destroy(context, ccache);
+ krb5_free_context(context);
+ return ret;
+}
+static int
+get_gss_creds(request_rec *r,
+ kerb_auth_config *conf,
+ gss_cred_id_t *server_creds)
+{
+ 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;
+ char buf[1024];
+ int have_server_princ;
+
+
+ have_server_princ = conf->krb_service_name && strchr(conf->krb_service_name, '/') != NULL;
+ if (have_server_princ)
+ strncpy(buf, conf->krb_service_name, sizeof(buf));
+ else
+ snprintf(buf, sizeof(buf), "%s@%s",
+ (conf->krb_service_name) ? conf->krb_service_name : SERVICE_NAME,
+ ap_get_server_name(r));
+
+ token.value = buf;
+ token.length = strlen(buf) + 1;
+
+ major_status = gss_import_name(&minor_status, &token,
+ (have_server_princ) ? GSS_KRB5_NT_PRINCIPAL_NAME : GSS_C_NT_HOSTBASED_SERVICE,
+ &server_name);
+ memset(&token, 0, sizeof(token));
+ if (GSS_ERROR(major_status)) {
+ log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
+ "%s", get_gss_error(r->pool, major_status, minor_status,
+ "gss_import_name() failed"));
+ return HTTP_INTERNAL_SERVER_ERROR;
+ }
+
+ major_status = gss_display_name(&minor_status, server_name, &token, NULL);
+ if (GSS_ERROR(major_status)) {
+ /* Perhaps we could just ignore this error but it's safer to give up now,
+ I think */
+ log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
+ "%s", get_gss_error(r->pool, major_status, minor_status,
+ "gss_display_name() failed"));
+ return HTTP_INTERNAL_SERVER_ERROR;
+ }
+
+ log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, "Acquiring creds for %s",
+ token.value);
+ 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,
+ server_creds, NULL, NULL);
+ gss_release_name(&minor_status2, &server_name);
+ if (GSS_ERROR(major_status)) {
+ log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
+ "%s", get_gss_error(r->pool, major_status, minor_status,
+ "gss_acquire_cred() failed"));
+ return HTTP_INTERNAL_SERVER_ERROR;
+ }
+
+#ifndef HEIMDAL
+ /*
+ * With MIT Kerberos 5 1.3.x the gss_cred_id_t is the same as
+ * krb5_gss_cred_id_t and krb5_gss_cred_id_rec contains a pointer to
+ * the replay cache.
+ * This allows us to override the replay cache function vector with
+ * our own one.
+ * Note that this is a dirty hack to get things working and there may
+ * well be unknown side-effects.
+ */
+ {
+ krb5_gss_cred_id_t gss_creds = (krb5_gss_cred_id_t) *server_creds;
+
+ /* First we try to verify we are linked with 1.3.x to prevent from
+ crashing when linked with 1.4.x */
+ if (gss_creds && (gss_creds->usage == GSS_C_ACCEPT)) {
+ if (gss_creds->rcache && gss_creds->rcache->ops &&
+ gss_creds->rcache->ops->type &&
+ memcmp(gss_creds->rcache->ops->type, "dfl", 3) == 0)
+ /* Override the rcache operations */
+ gss_creds->rcache->ops = &mod_auth_kerb_rc_ops;
+ }
+ }
+#endif
+
+ return 0;
+}
+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);
+}
-/***************************************************************************
- Username/Password Validation
- ***************************************************************************/
-#ifdef KRB5
-int kerb5_password_validate(request_rec *r, const char *user, const char *pass)
+static int
+authenticate_user_gss(request_rec *r, kerb_auth_config *conf,
+ const char *auth_line, char **negotiate_ret_value)
{
- kerb_auth_config *conf =
- (kerb_auth_config *)ap_get_module_config(r->per_dir_config,
- &kerb_auth_module);
- int ret;
- krb5_context kcontext;
- krb5_principal server, me;
- krb5_creds my_creds;
- krb5_timestamp now;
- krb5_ccache ccache = NULL;
- krb5_deltat lifetime = 300; /* 5 minutes */
- krb5_deltat renewal = 0;
- krb5_flags options = 0;
- krb5_data tgtname = {
- 0,
- KRB5_TGS_NAME_SIZE,
- KRB5_TGS_NAME
- };
- char *c, ccname[MAX_STRING_LEN];
-
- if (krb5_init_context(&kcontext))
- return 0;
-
- if (conf->krb_save_credentials) {
- lifetime = 1800; /* 30 minutes */
-
- if (conf->krb_forwardable) {
- options |= KDC_OPT_FORWARDABLE;
- }
-
- if (conf->krb_renewable) {
- options |= KDC_OPT_RENEWABLE;
- renewal = 86400; /* 24 hours */
- }
-
- sprintf(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 = '.';
- }
-
- ap_table_setn(r->subprocess_env, "KRB5CCNAME", ccname);
- if (krb5_cc_set_default_name(kcontext, ccname)) {
- return 0;
- }
- unlink(ccname+strlen("FILE:"));
- }
-
- if (conf->krb_lifetime) {
- lifetime = atoi(conf->krb_lifetime);
- }
-
- memset((char *)&my_creds, 0, sizeof(my_creds));
- if(krb5_parse_name(kcontext, user, &me))
- return 0;
- my_creds.client = me;
-
- 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 0;
- }
- my_creds.server = server;
- if (krb5_timeofday(kcontext, &now))
- return 0;
- my_creds.times.starttime = 0;
- my_creds.times.endtime = now + lifetime;
- my_creds.times.renew_till = now + renewal;
-
- if (conf->krb_save_credentials) {
- if (krb5_cc_resolve(kcontext, ccname, &ccache))
- return 0;
-
- if (krb5_cc_initialize(kcontext, ccache, me))
- return 0;
- }
-
- ret = krb5_get_in_tkt_with_password(kcontext, options, 0, NULL, 0,
- pass, ccache, &my_creds, 0);
- if (ret) {
- return 0;
- }
-
- krb5_free_cred_contents(kcontext, &my_creds);
-
- return 1;
+ OM_uint32 major_status, minor_status, minor_status2;
+ gss_buffer_desc input_token = GSS_C_EMPTY_BUFFER;
+ gss_buffer_desc output_token = GSS_C_EMPTY_BUFFER;
+ const char *auth_param = NULL;
+ int ret;
+ gss_name_t client_name = GSS_C_NO_NAME;
+ gss_cred_id_t delegated_cred = GSS_C_NO_CREDENTIAL;
+ OM_uint32 (KRB5_LIB_FUNCTION *accept_sec_token)
+ (OM_uint32 *, gss_ctx_id_t *, const gss_cred_id_t,
+ const gss_buffer_t, const gss_channel_bindings_t,
+ gss_name_t *, gss_OID *, gss_buffer_t, OM_uint32 *,
+ OM_uint32 *, gss_cred_id_t *);
+ gss_OID_desc spnego_oid;
+ gss_ctx_id_t context = GSS_C_NO_CONTEXT;
+ gss_cred_id_t server_creds = GSS_C_NO_CREDENTIAL;
+
+ *negotiate_ret_value = "\0";
+
+ spnego_oid.length = 6;
+ spnego_oid.elements = (void *)"\x2b\x06\x01\x05\x05\x02";
+
+ 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);
+#ifdef HEIMDAL
+ /* Seems to be also supported by latest MIT */
+ gsskrb5_register_acceptor_identity(conf->krb_5_keytab);
+#endif
+ }
+
+ ret = get_gss_creds(r, conf, &server_creds);
+ if (ret)
+ goto end;
+
+ /* ap_getword() shifts parameter */
+ auth_param = ap_getword_white(r->pool, &auth_line);
+ if (auth_param == NULL) {
+ log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
+ "No Authorization parameter in request from client");
+ ret = HTTP_UNAUTHORIZED;
+ goto end;
+ }
+
+ input_token.length = apr_base64_decode_len(auth_param) + 1;
+ input_token.value = apr_pcalloc(r->connection->pool, input_token.length);
+ if (input_token.value == NULL) {
+ log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
+ "ap_pcalloc() failed (not enough memory)");
+ ret = HTTP_INTERNAL_SERVER_ERROR;
+ goto end;
+ }
+ input_token.length = apr_base64_decode(input_token.value, auth_param);
+
+#ifdef GSSAPI_SUPPORTS_SPNEGO
+ accept_sec_token = gss_accept_sec_context;
+#else
+ accept_sec_token = (cmp_gss_type(&input_token, &spnego_oid) == 0) ?
+ gss_accept_sec_context_spnego : gss_accept_sec_context;
+#endif
+
+ log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, "Verifying client data using %s",
+ (accept_sec_token == gss_accept_sec_context)
+ ? "KRB5 GSS-API"
+ : "SPNEGO GSS-API");
+
+ major_status = accept_sec_token(&minor_status,
+ &context,
+ server_creds,
+ &input_token,
+ GSS_C_NO_CHANNEL_BINDINGS,
+ &client_name,
+ NULL,
+ &output_token,
+ NULL,
+ NULL,
+ &delegated_cred);
+ log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
+ "Verification returned code %d", major_status);
+ if (output_token.length) {
+ char *token = NULL;
+ size_t len;
+
+ len = apr_base64_encode_len(output_token.length) + 1;
+ token = apr_pcalloc(r->connection->pool, len + 1);
+ if (token == NULL) {
+ log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
+ "ap_pcalloc() failed (not enough memory)");
+ ret = HTTP_INTERNAL_SERVER_ERROR;
+ gss_release_buffer(&minor_status2, &output_token);
+ goto end;
+ }
+ apr_base64_encode(token, output_token.value, output_token.length);
+ token[len] = '\0';
+ *negotiate_ret_value = token;
+ log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
+ "GSS-API token of length %d bytes will be sent back",
+ output_token.length);
+ gss_release_buffer(&minor_status2, &output_token);
+ set_kerb_auth_headers(r, conf, 0, 0, *negotiate_ret_value);
+ }
+
+ if (GSS_ERROR(major_status)) {
+ if (input_token.length > 7 && memcmp(input_token.value, "NTLMSSP", 7) == 0)
+ log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
+ "Warning: received token seems to be NTLM, which isn't supported by the Kerberos module. Check your IE configuration.");
+
+ log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
+ "%s", get_gss_error(r->pool, major_status, minor_status,
+ "gss_accept_sec_context() failed"));
+ /* Don't offer the Negotiate method again if call to GSS layer failed */
+ *negotiate_ret_value = NULL;
+ ret = HTTP_UNAUTHORIZED;
+ goto end;
+ }
+
+#if 0
+ /* This is a _Kerberos_ module so multiple authentication rounds aren't
+ * supported. If we wanted a generic GSS authentication we would have to do
+ * some magic with exporting context etc. */
+ if (major_status & GSS_S_CONTINUE_NEEDED) {
+ ret = HTTP_UNAUTHORIZED;
+ goto end;
+ }
+#endif
+
+ major_status = gss_display_name(&minor_status, client_name, &output_token, NULL);
+ gss_release_name(&minor_status, &client_name);
+ if (GSS_ERROR(major_status)) {
+ log_rerror(APLOG_MARK, APLOG_ERR, 0, r,
+ "%s", get_gss_error(r->pool, major_status, minor_status,
+ "gss_display_name() failed"));
+ ret = HTTP_INTERNAL_SERVER_ERROR;
+ goto end;
+ }
+
+ MK_AUTH_TYPE = MECH_NEGOTIATE;
+ MK_USER = apr_pstrdup(r->pool, output_token.value);
+
+ if (conf->krb_save_credentials && delegated_cred != GSS_C_NO_CREDENTIAL)
+ store_gss_creds(r, conf, (char *)output_token.value, delegated_cred);
+
+ gss_release_buffer(&minor_status, &output_token);
+
+ ret = OK;
+
+end:
+ if (delegated_cred)
+ gss_release_cred(&minor_status, &delegated_cred);
+
+ if (output_token.length)
+ gss_release_buffer(&minor_status, &output_token);
+
+ if (client_name != GSS_C_NO_NAME)
+ gss_release_name(&minor_status, &client_name);
+
+ if (server_creds != GSS_C_NO_CREDENTIAL)
+ gss_release_cred(&minor_status, &server_creds);
+
+ if (context != GSS_C_NO_CONTEXT)
+ gss_delete_sec_context(&minor_status, &context, GSS_C_NO_BUFFER);
+
+ return ret;
}
#endif /* KRB5 */
-#ifdef KRB4
-int kerb4_password_validate(request_rec *r, const char *user, const char *pass)
+static int
+already_succeeded(request_rec *r)
{
- kerb_auth_config *conf =
- (kerb_auth_config *)ap_get_module_config(r->per_dir_config,
- &kerb_auth_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;
- }
+ if (ap_is_initial_req(r) || MK_AUTH_TYPE == NULL)
+ return 0;
+ if (strcmp(MK_AUTH_TYPE, MECH_NEGOTIATE) ||
+ (strcmp(MK_AUTH_TYPE, "Basic") && strchr(MK_USER, '@')))
+ return 1;
+ return 0;
}
-#endif /* KRB4 */
+static void
+set_kerb_auth_headers(request_rec *r, const kerb_auth_config *conf,
+ int use_krb4, int use_krb5pwd, char *negotiate_ret_value)
+{
+ const char *auth_name = NULL;
+ int set_basic = 0;
+ char *negoauth_param;
+ const char *header_name =
+ (r->proxyreq == PROXYREQ_PROXY) ? "Proxy-Authenticate" : "WWW-Authenticate";
+ /* get the user realm specified in .htaccess */
+ auth_name = ap_auth_name(r);
+ /* XXX should the WWW-Authenticate header be cleared first?
+ * apache in the proxy mode should retain client's authN headers? */
+#ifdef KRB5
+ if (negotiate_ret_value != NULL && conf->krb_method_gssapi) {
+ negoauth_param = (*negotiate_ret_value == '\0') ? MECH_NEGOTIATE :
+ apr_pstrcat(r->pool, MECH_NEGOTIATE " ", negotiate_ret_value, NULL);
+ apr_table_add(r->err_headers_out, header_name, negoauth_param);
+ }
+ if ((use_krb5pwd && conf->krb_method_k5pass) || conf->krb_delegate_basic) {
+ apr_table_add(r->err_headers_out, header_name,
+ apr_pstrcat(r->pool, "Basic realm=\"", auth_name, "\"", NULL));
+ set_basic = 1;
+ }
+#endif
-/***************************************************************************
- User Authentication
- ***************************************************************************/
-int kerb_authenticate_user(request_rec *r)
+#ifdef KRB4
+ if (!set_basic &&
+ ((use_krb4 && conf->krb_method_k4pass) || conf->krb_delegate_basic))
+ apr_table_add(r->err_headers_out, header_name,
+ apr_pstrcat(r->pool, "Basic realm=\"", auth_name, "\"", NULL));
+#endif
+}
+
+static int
+kerb_authenticate_user(request_rec *r)
{
- const char *name; /* AuthName specified */
- const char *type; /* AuthType specified */
- int KerberosV5 = 0; /* Kerberos V5 check enabled */
- int KerberosV4 = 0; /* Kerberos V4 check enabled */
- int KerberosV4first = 0; /* Kerberos V4 check first */
- const char *sent_pw; /* Password sent by browser */
- int res; /* Response holder */
- int retcode; /* Return code holder */
- const char *t; /* Decoded auth_line */
- const char *authtype; /* AuthType to send back to browser */
- const char *auth_line = MK_TABLE_GET(r->headers_in,
- (r->proxyreq == MK_PROXY)
- ? "Proxy-Authorization"
- : "Authorization");
- kerb_auth_config *conf =
- (kerb_auth_config *)ap_get_module_config(r->per_dir_config,
- &kerb_auth_module);
-
- type = ap_auth_type(r);
-
- if (type != NULL) {
+ kerb_auth_config *conf =
+ (kerb_auth_config *) ap_get_module_config(r->per_dir_config,
+ &auth_kerb_module);
+ const char *auth_type = NULL;
+ const char *auth_line = NULL;
+ const char *type = NULL;
+ int use_krb5 = 0, use_krb4 = 0;
+ int ret;
+ static int last_return = HTTP_UNAUTHORIZED;
+ char *negotiate_ret_value = NULL;
+
+ /* get the type specified in .htaccess */
+ type = ap_auth_type(r);
+
+ log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r,
+ "kerb_authenticate_user entered with user %s and auth_type %s",
+ (MK_USER)?MK_USER:"(NULL)",type?type:"(NULL)");
+
+ if (type && strcasecmp(type, "Kerberos") == 0)
+ use_krb5 = use_krb4 = 1;
+ else if(type && strcasecmp(type, "KerberosV5") == 0)
+ use_krb5 = 1;
+ else if(type && strcasecmp(type, "KerberosV4") == 0)
+ use_krb4 = 1;
+ else
+ return DECLINED;
+
+#if 0
+ if (conf->krb_ssl_preauthentication) {
+ const char *ssl_client_verify = ssl_var_lookup(r->pool, r->server,
+ r->connection, r, "SSL_CLIENT_VERIFY");
+
+ if (ssl_client_verify && strcmp(ssl_client_verify, "SUCCESS") == 0)
+ return OK;
+ }
+#endif
+
+ /* get what the user sent us in the HTTP header */
+ auth_line = MK_TABLE_GET(r->headers_in, (r->proxyreq == PROXYREQ_PROXY)
+ ? "Proxy-Authorization"
+ : "Authorization");
+ if (!auth_line) {
+ set_kerb_auth_headers(r, conf, use_krb4, use_krb5,
+ (use_krb5) ? "\0" : NULL);
+ return HTTP_UNAUTHORIZED;
+ }
+ auth_type = ap_getword_white(r->pool, &auth_line);
+
+ /* If we are delegating Basic to other modules, DECLINE the request */
+ if (conf->krb_delegate_basic &&
#ifdef KRB5
- if ((strncasecmp(type, "KerberosV5", 10) == 0) ||
- (strncasecmp(conf->krb_auth_type, "KerberosV5", 10) == 0)) {
- KerberosV5 = 1;
- }
-#endif /* KRB5 */
-
+ !conf->krb_method_k5pass &&
+#endif
#ifdef KRB4
- if ((strncasecmp(type, "KerberosV4", 10) == 0) ||
- (strncasecmp(conf->krb_auth_type, "KerberosV4", 10) == 0)) {
- KerberosV4 = 1;
- }
-#endif /* KRB4 */
+ !conf->krb_method_k4pass &&
+#endif
+ (strcasecmp(auth_type, "Basic") == 0))
+ return DECLINED;
+
+ if (already_succeeded(r))
+ return last_return;
-#if defined(KRB5) && defined(KRB4)
- if ((strncasecmp(type, "KerberosDualV5V4", 15) == 0) ||
- (strncasecmp(conf->krb_auth_type, "KerberosDualV5V4", 15) == 0)) {
- KerberosV5 = 1;
- KerberosV4 = 1;
- }
-
- if ((strncasecmp(type, "KerberosDualV4V5", 15) == 0) ||
- (strncasecmp(conf->krb_auth_type, "KerberosDualV4V5", 15) == 0)) {
- KerberosV5 = 1;
- KerberosV4 = 1;
- KerberosV4first = 1;
- }
-#endif /* KRB5 && KRB4 */
- }
-
- if (!KerberosV4 && !KerberosV5) {
- if (conf->krb_authoritative) {
- return HTTP_UNAUTHORIZED;
- }
- else {
- return DECLINED;
- }
- }
-
- name = ap_auth_name(r);
- if (!name) {
- return HTTP_INTERNAL_SERVER_ERROR;
- }
-
- if (!auth_line) {
- MK_TABLE_SET(r->err_headers_out, "WWW-Authenticate",
- (char *)ap_pstrcat(r->pool,
- "Basic realm=\"", name, "\"", NULL));
- return HTTP_UNAUTHORIZED;
- }
-
- type = ap_getword_white(r->pool, &auth_line);
- t = ap_pbase64decode(r->pool, auth_line);
- MK_USER = ap_getword_nulls(r->pool, &t, ':');
- MK_AUTH_TYPE = "Kerberos";
- sent_pw = ap_getword_white(r->pool, &t);
-
- retcode = DECLINED;
+ ret = HTTP_UNAUTHORIZED;
#ifdef KRB5
- if (KerberosV5 && !KerberosV4first && retcode != OK) {
- MK_AUTH_TYPE = "KerberosV5";
- if (kerb5_password_validate(r, MK_USER, sent_pw)) {
- retcode = OK;
- }
- else {
- retcode = conf->krb_fail_status;
- }
- }
-#endif /* KRB5 */
+ if (use_krb5 && conf->krb_method_gssapi &&
+ strcasecmp(auth_type, MECH_NEGOTIATE) == 0) {
+ ret = authenticate_user_gss(r, conf, auth_line, &negotiate_ret_value);
+ } else if (use_krb5 && conf->krb_method_k5pass &&
+ strcasecmp(auth_type, "Basic") == 0) {
+ ret = authenticate_user_krb5pwd(r, conf, auth_line);
+ }
+#endif
#ifdef KRB4
- if (KerberosV4 && retcode != OK) {
- MK_AUTH_TYPE = "KerberosV4";
- if (kerb4_password_validate(r, MK_USER, sent_pw)) {
- retcode = OK;
- }
- else {
- retcode = conf->krb_fail_status;
- }
- }
-#endif /* KRB4 */
-
-#if defined(KRB5) && defined(KRB4)
- if (KerberosV5 && KerberosV4first && retcode != OK) {
- MK_AUTH_TYPE = "KerberosV5";
- if (kerb5_password_validate(r, MK_USER, sent_pw)) {
- retcode = OK;
- }
- else {
- retcode = conf->krb_fail_status;
- }
- }
-#endif /* KRB5 && KRB4 */
-
- if (conf->krb_authoritative && retcode == DECLINED) {
- return HTTP_UNAUTHORIZED;
- }
- else {
- return retcode;
- }
-}
+ if (ret == HTTP_UNAUTHORIZED && use_krb4 && conf->krb_method_k4pass &&
+ strcasecmp(auth_type, "Basic") == 0)
+ ret = authenticate_user_krb4pwd(r, conf, auth_line);
+#endif
+ if (ret == HTTP_UNAUTHORIZED)
+ set_kerb_auth_headers(r, conf, use_krb4, use_krb5, negotiate_ret_value);
+ /* XXX log_debug: if ret==OK, log(user XY authenticated) */
+ last_return = ret;
+ return ret;
+}
-/***************************************************************************
- Access Verification
- ***************************************************************************/
-int kerb_check_user_access(request_rec *r)
+int
+have_rcache_type(const char *type)
{
- register int x;
- const char *t, *w;
- const MK_ARRAY_HEADER *reqs_arr = ap_requires(r);
- require_line *reqs;
- kerb_auth_config *conf =
- (kerb_auth_config *)ap_get_module_config(r->per_dir_config,
- &kerb_auth_module);
-
- if (reqs_arr == NULL) {
- return OK;
- }
- reqs = (require_line *)reqs_arr->elts;
-
- for (x = 0; x < reqs_arr->nelts; x++) {
- t = reqs[x].requirement;
- w = ap_getword_white(r->pool, &t);
- if (strcmp(w, "realm") == 0) {
- while (t[0] != '\0') {
- w = ap_getword_conf(r->pool, &t);
- if (strcmp(MK_USER, w) == 0) {
- return OK;
- }
- }
- }
- }
-
- return DECLINED;
-}
+ krb5_error_code ret;
+ krb5_context context;
+ krb5_rcache id = NULL;
+ int found;
+
+ ret = krb5_init_context(&context);
+ if (ret)
+ return 0;
+ ret = krb5_rc_resolve_full(context, &id, "none:");
+ found = (ret == 0);
+ if (ret == 0)
+ krb5_rc_destroy(context, id);
+ krb5_free_context(context);
+ return found;
+}
/***************************************************************************
Module Setup/Configuration
***************************************************************************/
-#ifdef APXS1
-module MODULE_VAR_EXPORT kerb_auth_module = {
+#ifndef STANDARD20_MODULE_STUFF
+static void
+kerb_module_init(server_rec *dummy, pool *p)
+{
+#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 */
+ if (getenv("KRB5RCACHETYPE") == NULL && have_rcache_type("none"))
+ putenv(strdup("KRB5RCACHETYPE=none"));
+#endif
+}
+
+module MODULE_VAR_EXPORT auth_kerb_module = {
STANDARD_MODULE_STUFF,
- NULL, /* module initializer */
- kerb_dir_config, /* per-directory config creator */
+ kerb_module_init, /* module initializer */
+ kerb_dir_create_config, /* per-directory config creator */
NULL, /* per-directory config merger */
NULL, /* per-server config creator */
NULL, /* per-server config merger */
NULL, /* [ 9] content handlers */
NULL, /* [ 2] URI-to-filename translation */
kerb_authenticate_user, /* [ 5] check/validate user_id */
- kerb_check_user_access, /* [ 6] check user_id is valid *here* */
+ NULL, /* [ 6] check user_id is valid *here* */
NULL, /* [ 4] check access by host address */
NULL, /* [ 7] MIME type checker/setter */
NULL, /* [ 8] fixups */
NULL, /* process exit/cleanup */
NULL /* [ 1] post read_request handling */
#ifdef EAPI
- , /* EAPI Additions */
- NULL, /* EAPI add module */
- NULL, /* EAPI remove module */
- NULL, /* EAPI rewrite command */
- NULL /* EAPI new connection */
-#endif /* EAPI */
+ ,NULL, /* EAPI: add_module */
+ NULL, /* EAPI: remove_module */
+ NULL, /* EAPI: rewrite_command */
+ NULL /* EAPI: new_connection */
+#endif
};
#else
-#ifdef APXS2
-void kerb_register_hooks(apr_pool_t *p)
+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);
+#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 */
+ if (getenv("KRB5RCACHETYPE") == NULL && have_rcache_type("none"))
+ putenv(strdup("KRB5RCACHETYPE=none"));
+#endif
+
+ return OK;
+}
+
+static void
+kerb_register_hooks(apr_pool_t *p)
{
- ap_hook_check_user_id(kerb_authenticate_user, NULL, NULL, APR_HOOK_MIDDLE);
- ap_hook_access_checker(kerb_check_user_access, NULL, NULL, APR_HOOK_MIDDLE);
+ 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);
}
-module AP_MODULE_DECLARE_DATA kerb_auth_module =
+module AP_MODULE_DECLARE_DATA auth_kerb_module =
{
- STANDARD20_MODULE_STUFF,
- kerb_dir_config, /* create per-dir conf structures */
- NULL, /* merge per-dir conf structures */
- NULL, /* create per-server conf structures */
- NULL, /* merge per-server conf structures */
- kerb_auth_cmds, /* table of configuration directives */
- kerb_register_hooks /* register hooks */
+ STANDARD20_MODULE_STUFF,
+ kerb_dir_create_config, /* create per-dir conf structures */
+ NULL, /* merge per-dir conf structures */
+ NULL, /* create per-server conf structures */
+ NULL, /* merge per-server conf structures */
+ kerb_auth_cmds, /* table of configuration directives */
+ kerb_register_hooks /* register hooks */
};
-#endif /* APXS2 */
-#endif /* APXS1 */
+#endif