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   1 /*
   2  * Copyright (c) 2011, JANET(UK)
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  *
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * 3. Neither the name of JANET(UK) nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  21  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #ifndef _GSSAPIP_EAP_H_
  34 #define _GSSAPIP_EAP_H_ 1
  35
  36 #include "config.h"
  37
  38 #ifdef HAVE_HEIMDAL_VERSION
  39 #define KRB5_DEPRECATED         /* so we can use krb5_free_unparsed_name() */
  40 #endif
  41
  42 #include <assert.h>
  43 #include <string.h>
  44 #include <errno.h>
  45 #ifdef HAVE_UNISTD_H
  46 #include <unistd.h>
  47 #endif
  48 #ifdef HAVE_STDLIB_H
  49 #include <stdlib.h>
  50 #endif
  51 #ifdef HAVE_STDARG_H
  52 #include <stdarg.h>
  53 #endif
  54 #include <time.h>
  55 #ifdef HAVE_SYS_PARAM_H
  56 #include <sys/param.h>
  57 #endif
  58
  59 #ifdef WIN32
  60 #ifndef MAXHOSTNAMELEN
  61 # include <WinSock2.h>
  62 # define MAXHOSTNAMELEN NI_MAXHOST
  63 #endif
  64 #endif
  65
  66 /* GSS headers */
  67 #include <gssapi/gssapi.h>
  68 #include <gssapi/gssapi_krb5.h>
  69 #ifdef HAVE_HEIMDAL_VERSION
  70 typedef struct gss_any *gss_any_t;
  71 #else
  72 #include <gssapi/gssapi_ext.h>
  73 #endif
  74 #include "gssapi_eap.h"
  75
  76 #ifndef HAVE_GSS_INQUIRE_ATTRS_FOR_MECH
  77 typedef const gss_OID_desc *gss_const_OID;
  78 #endif
  79
  80 /* Kerberos headers */
  81 #include <krb5.h>
  82
  83 /* EAP headers */
  84 #include <includes.h>
  85 #include <common.h>
  86 #include <eap_peer/eap.h>
  87 #include <eap_peer/eap_config.h>
  88 #include <eap_peer/eap_methods.h>
  89 #include <eap_common/eap_common.h>
  90 #include <wpabuf.h>
  91
  92 #ifdef GSSEAP_ENABLE_ACCEPTOR
  93 /* FreeRADIUS headers */
  94 #ifdef __cplusplus
  95 extern "C" {
  96 #ifndef WIN32
  97 #define operator fr_operator
  98 #endif
  99 #endif
 100 #include <freeradius/libradius.h>
 101 #include <freeradius/radius.h>
 102
 103 #undef pid_t
 104
 105 /* libradsec headers */
 106 #include <radsec/radsec.h>
 107 #include <radsec/request.h>
 108 #ifdef __cplusplus
 109 #ifndef WIN32
 110 #undef operator
 111 #endif
 112 }
 113 #endif
 114 #endif /* GSSEAP_ENABLE_ACCEPTOR */
 115
 116 #include "gsseap_err.h"
 117 #include "radsec_err.h"
 118 #include "util.h"
 119
 120 #ifdef __cplusplus
 121 extern "C" {
 122 #endif
 123
 124 /* These name flags are informative and not actually used by anything yet */
 125 #define NAME_FLAG_NAI                       0x00000001
 126 #define NAME_FLAG_SERVICE                   0x00000002
 127 #define NAME_FLAG_COMPOSITE                 0x00000004
 128
 129 struct gss_eap_saml_attr_ctx;
 130 struct gss_eap_attr_ctx;
 131
 132 #ifdef HAVE_HEIMDAL_VERSION
 133 struct gss_name_t_desc_struct
 134 #else
 135 struct gss_name_struct
 136 #endif
 137 {
 138     GSSEAP_MUTEX mutex; /* mutex protects attrCtx */
 139     OM_uint32 flags;
 140     gss_OID mechanismUsed; /* this is immutable */
 141     krb5_principal krbPrincipal; /* this is immutable */
 142 #ifdef GSSEAP_ENABLE_ACCEPTOR
 143     struct gss_eap_attr_ctx *attrCtx;
 144 #endif
 145 };
 146
 147 #define CRED_FLAG_INITIATE                  0x00010000
 148 #define CRED_FLAG_ACCEPT                    0x00020000
 149 #define CRED_FLAG_PASSWORD                  0x00040000
 150 #define CRED_FLAG_DEFAULT_CCACHE            0x00080000
 151 #define CRED_FLAG_RESOLVED                  0x00100000
 152 #define CRED_FLAG_PUBLIC_MASK               0x0000FFFF
 153
 154 #ifdef HAVE_HEIMDAL_VERSION
 155 struct gss_cred_id_t_desc_struct
 156 #else
 157 struct gss_cred_id_struct
 158 #endif
 159 {
 160     GSSEAP_MUTEX mutex;
 161     OM_uint32 flags;
 162     gss_name_t name;
 163     gss_name_t target; /* for initiator */
 164     gss_buffer_desc password;
 165     gss_OID_set mechanisms;
 166     time_t expiryTime;
 167     gss_buffer_desc radiusConfigFile;
 168     gss_buffer_desc radiusConfigStanza;
 169     gss_buffer_desc caCertificate;
 170     gss_buffer_desc subjectNameConstraint;
 171     gss_buffer_desc subjectAltNameConstraint;
 172 #ifdef GSSEAP_ENABLE_REAUTH
 173     krb5_ccache krbCredCache;
 174     gss_cred_id_t reauthCred;
 175 #endif
 176 };
 177
 178 #define CTX_FLAG_INITIATOR                  0x00000001
 179 #define CTX_FLAG_KRB_REAUTH                 0x00000002
 180
 181 #define CTX_IS_INITIATOR(ctx)               (((ctx)->flags & CTX_FLAG_INITIATOR) != 0)
 182
 183 #define CTX_IS_ESTABLISHED(ctx)             ((ctx)->state == GSSEAP_STATE_ESTABLISHED)
 184
 185 /* Initiator context flags */
 186 #define CTX_FLAG_EAP_SUCCESS                0x00010000
 187 #define CTX_FLAG_EAP_RESTART                0x00020000
 188 #define CTX_FLAG_EAP_FAIL                   0x00040000
 189 #define CTX_FLAG_EAP_RESP                   0x00080000
 190 #define CTX_FLAG_EAP_NO_RESP                0x00100000
 191 #define CTX_FLAG_EAP_REQ                    0x00200000
 192 #define CTX_FLAG_EAP_PORT_ENABLED           0x00400000
 193 #define CTX_FLAG_EAP_ALT_ACCEPT             0x00800000
 194 #define CTX_FLAG_EAP_ALT_REJECT             0x01000000
 195 #define CTX_FLAG_EAP_MASK                   0xFFFF0000
 196
 197 struct gss_eap_initiator_ctx {
 198     unsigned int idleWhile;
 199     struct eap_peer_config eapPeerConfig;
 200     struct eap_sm *eap;
 201     struct wpabuf reqData;
 202 };
 203
 204 #ifdef GSSEAP_ENABLE_ACCEPTOR
 205 struct gss_eap_acceptor_ctx {
 206     struct rs_context *radContext;
 207     struct rs_connection *radConn;
 208     char *radServer;
 209     gss_buffer_desc state;
 210     VALUE_PAIR *vps;
 211 };
 212 #endif
 213
 214 #ifdef HAVE_HEIMDAL_VERSION
 215 struct gss_ctx_id_t_desc_struct
 216 #else
 217 struct gss_ctx_id_struct
 218 #endif
 219 {
 220     GSSEAP_MUTEX mutex;
 221     enum gss_eap_state state;
 222     OM_uint32 flags;
 223     OM_uint32 gssFlags;
 224     gss_OID mechanismUsed;
 225     krb5_cksumtype checksumType;
 226     krb5_enctype encryptionType;
 227     krb5_keyblock rfc3961Key;
 228     gss_name_t initiatorName;
 229     gss_name_t acceptorName;
 230     time_t expiryTime;
 231     uint64_t sendSeq, recvSeq;
 232     void *seqState;
 233     gss_cred_id_t cred;
 234     union {
 235         struct gss_eap_initiator_ctx initiator;
 236         #define initiatorCtx         ctxU.initiator
 237 #ifdef GSSEAP_ENABLE_ACCEPTOR
 238         struct gss_eap_acceptor_ctx  acceptor;
 239         #define acceptorCtx          ctxU.acceptor
 240 #endif
 241 #ifdef GSSEAP_ENABLE_REAUTH
 242         gss_ctx_id_t                 reauth;
 243         #define reauthCtx            ctxU.reauth
 244 #endif
 245     } ctxU;
 246     const struct gss_eap_token_buffer_set *inputTokens;
 247     const struct gss_eap_token_buffer_set *outputTokens;
 248 };
 249
 250 #define TOK_FLAG_SENDER_IS_ACCEPTOR         0x01
 251 #define TOK_FLAG_WRAP_CONFIDENTIAL          0x02
 252 #define TOK_FLAG_ACCEPTOR_SUBKEY            0x04
 253
 254 #define KEY_USAGE_ACCEPTOR_SEAL             22
 255 #define KEY_USAGE_ACCEPTOR_SIGN             23
 256 #define KEY_USAGE_INITIATOR_SEAL            24
 257 #define KEY_USAGE_INITIATOR_SIGN            25
 258
 259 /* accept_sec_context.c */
 260 OM_uint32
 261 gssEapAcceptSecContext(OM_uint32 *minor,
 262                        gss_ctx_id_t ctx,
 263                        gss_cred_id_t cred,
 264                        gss_buffer_t input_token,
 265                        gss_channel_bindings_t input_chan_bindings,
 266                        gss_name_t *src_name,
 267                        gss_OID *mech_type,
 268                        gss_buffer_t output_token,
 269                        OM_uint32 *ret_flags,
 270                        OM_uint32 *time_rec,
 271                        gss_cred_id_t *delegated_cred_handle);
 272
 273 /* init_sec_context.c */
 274 OM_uint32
 275 gssEapInitSecContext(OM_uint32 *minor,
 276                      gss_cred_id_t cred,
 277                      gss_ctx_id_t ctx,
 278                      gss_name_t target_name,
 279                      gss_OID mech_type,
 280                      OM_uint32 req_flags,
 281                      OM_uint32 time_req,
 282                      gss_channel_bindings_t input_chan_bindings,
 283                      gss_buffer_t input_token,
 284                      gss_OID *actual_mech_type,
 285                      gss_buffer_t output_token,
 286                      OM_uint32 *ret_flags,
 287                      OM_uint32 *time_rec);
 288
 289 /* wrap_iov.c */
 290 OM_uint32
 291 gssEapWrapOrGetMIC(OM_uint32 *minor,
 292                    gss_ctx_id_t ctx,
 293                    int conf_req_flag,
 294                    int *conf_state,
 295                    gss_iov_buffer_desc *iov,
 296                    int iov_count,
 297                    enum gss_eap_token_type toktype);
 298
 299 OM_uint32
 300 gssEapUnwrapOrVerifyMIC(OM_uint32 *minor_status,
 301                         gss_ctx_id_t ctx,
 302                         int *conf_state,
 303                         gss_qop_t *qop_state,
 304                         gss_iov_buffer_desc *iov,
 305                         int iov_count,
 306                         enum gss_eap_token_type toktype);
 307
 308 OM_uint32
 309 gssEapWrapIovLength(OM_uint32 *minor,
 310                     gss_ctx_id_t ctx,
 311                     int conf_req_flag,
 312                     gss_qop_t qop_req,
 313                     int *conf_state,
 314                     gss_iov_buffer_desc *iov,
 315                     int iov_count);
 316 OM_uint32
 317 gssEapWrap(OM_uint32 *minor,
 318            gss_ctx_id_t ctx,
 319            int conf_req_flag,
 320            gss_qop_t qop_req,
 321            gss_buffer_t input_message_buffer,
 322            int *conf_state,
 323            gss_buffer_t output_message_buffer);
 324
 325 unsigned char
 326 rfc4121Flags(gss_ctx_id_t ctx, int receiving);
 327
 328 /* display_status.c */
 329 void
 330 gssEapSaveStatusInfo(OM_uint32 minor, const char *format, ...);
 331
 332 OM_uint32
 333 gssEapDisplayStatus(OM_uint32 *minor,
 334                     OM_uint32 status_value,
 335                     gss_buffer_t status_string);
 336
 337 #define IS_WIRE_ERROR(err)              ((err) > GSSEAP_RESERVED && \
 338                                          (err) <= GSSEAP_RADIUS_PROT_FAILURE)
 339
 340 /* upper bound of RADIUS error range must be kept in sync with radsec.h */
 341 #define IS_RADIUS_ERROR(err)            ((err) >= ERROR_TABLE_BASE_rse && \
 342                                          (err) <= ERROR_TABLE_BASE_rse + 20)
 343
 344 /* export_sec_context.c */
 345 OM_uint32
 346 gssEapExportSecContext(OM_uint32 *minor,
 347                        gss_ctx_id_t ctx,
 348                        gss_buffer_t token);
 349
 350 /* import_sec_context.c */
 351 OM_uint32
 352 gssEapImportContext(OM_uint32 *minor,
 353                     gss_buffer_t token,
 354                     gss_ctx_id_t ctx);
 355
 356 /* pseudo_random.c */
 357 OM_uint32
 358 gssEapPseudoRandom(OM_uint32 *minor,
 359                    gss_ctx_id_t ctx,
 360                    int prf_key,
 361                    const gss_buffer_t prf_in,
 362                    ssize_t desired_output_len,
 363                    gss_buffer_t prf_out);
 364
 365 /* eap_mech.c */
 366 OM_uint32
 367 gssEapInitiatorInit(OM_uint32 *minor);
 368
 369 void
 370 gssEapFinalize(void);
 371
 372 #ifdef __cplusplus
 373 }
 374 #endif
 375
 376 #endif /* _GSSAPIP_EAP_H_ */