mech_eap/gssapiP_eap.h

   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 #ifndef GSS_IOV_BUFFER_TYPE_MIC_TOKEN
  81 #define GSS_IOV_BUFFER_TYPE_MIC_TOKEN      12  /* MIC token destination */
  82 #endif
  83
  84 /* Kerberos headers */
  85 #include <krb5.h>
  86 #include <et/com_err.h>
  87
  88 /* EAP headers */
  89 #include <includes.h>
  90 #include <common.h>
  91 #include <eap_peer/eap.h>
  92 #include <eap_peer/eap_config.h>
  93 #include <eap_peer/eap_methods.h>
  94 #include <eap_common/eap_common.h>
  95 #include <wpabuf.h>
  96
  97 #ifdef GSSEAP_ENABLE_ACCEPTOR
  98 /* libradsec headers */
  99 #include <radsec/radsec.h>
 100 #include <radsec/request.h>
 101 #include <radsec/radius.h>
 102 #endif
 103
 104 #include "gssapi_headerfix.h"
 105 #include "gsseap_err.h"
 106 #include "radsec_err.h"
 107 #include "util.h"
 108
 109 #ifdef __cplusplus
 110 extern "C" {
 111 #endif
 112
 113 /* These name flags are informative and not actually used by anything yet */
 114 #define NAME_FLAG_NAI                       0x00000001
 115 #define NAME_FLAG_SERVICE                   0x00000002
 116 #define NAME_FLAG_COMPOSITE                 0x00000004
 117
 118 struct gss_eap_saml_attr_ctx;
 119 struct gss_eap_attr_ctx;
 120
 121 #ifdef HAVE_HEIMDAL_VERSION
 122 struct gss_name_t_desc_struct
 123 #else
 124 struct gss_name_struct
 125 #endif
 126 {
 127     GSSEAP_MUTEX mutex; /* mutex protects attrCtx */
 128     OM_uint32 flags;
 129     gss_OID mechanismUsed; /* this is immutable */
 130     krb5_principal krbPrincipal; /* this is immutable */
 131 #ifdef GSSEAP_ENABLE_ACCEPTOR
 132     struct gss_eap_attr_ctx *attrCtx;
 133 #endif
 134 };
 135
 136 #define CRED_FLAG_INITIATE                  0x00010000
 137 #define CRED_FLAG_ACCEPT                    0x00020000
 138 #define CRED_FLAG_PASSWORD                  0x00040000
 139 #define CRED_FLAG_DEFAULT_CCACHE            0x00080000
 140 #define CRED_FLAG_RESOLVED                  0x00100000
 141 #define CRED_FLAG_TARGET                    0x00200000
 142 #define CRED_FLAG_CERTIFICATE               0x00400000
 143 #define CRED_FLAG_CONFIG_BLOB               0x00800000
 144 #define CRED_FLAG_PUBLIC_MASK               0x0000FFFF
 145
 146 #ifdef HAVE_HEIMDAL_VERSION
 147 struct gss_cred_id_t_desc_struct
 148 #else
 149 struct gss_cred_id_struct
 150 #endif
 151 {
 152     GSSEAP_MUTEX mutex;
 153     OM_uint32 flags;
 154     gss_name_t name;
 155     gss_name_t target; /* for initiator */
 156     gss_buffer_desc password;
 157     gss_OID_set mechanisms;
 158     time_t expiryTime;
 159     gss_buffer_desc radiusConfigFile;
 160     gss_buffer_desc radiusConfigStanza;
 161     gss_buffer_desc caCertificate;
 162     gss_buffer_desc subjectNameConstraint;
 163     gss_buffer_desc subjectAltNameConstraint;
 164     gss_buffer_desc clientCertificate;
 165     gss_buffer_desc privateKey;
 166     gss_buffer_desc caCertificateBlob;
 167 #ifdef GSSEAP_ENABLE_REAUTH
 168     krb5_ccache krbCredCache;
 169     gss_cred_id_t reauthCred;
 170 #endif
 171 };
 172
 173 #define CTX_FLAG_INITIATOR                  0x00000001
 174 #define CTX_FLAG_KRB_REAUTH                 0x00000002
 175 #define CTX_FLAG_CHANNEL_BINDINGS_VERIFIED  0x00000004
 176
 177 #define CTX_IS_INITIATOR(ctx)               (((ctx)->flags & CTX_FLAG_INITIATOR) != 0)
 178
 179 #define CTX_IS_ESTABLISHED(ctx)             ((ctx)->state == GSSEAP_STATE_ESTABLISHED)
 180
 181 /* Initiator context flags */
 182 #define CTX_FLAG_EAP_SUCCESS                0x00010000
 183 #define CTX_FLAG_EAP_RESTART                0x00020000
 184 #define CTX_FLAG_EAP_FAIL                   0x00040000
 185 #define CTX_FLAG_EAP_RESP                   0x00080000
 186 #define CTX_FLAG_EAP_NO_RESP                0x00100000
 187 #define CTX_FLAG_EAP_REQ                    0x00200000
 188 #define CTX_FLAG_EAP_PORT_ENABLED           0x00400000
 189 #define CTX_FLAG_EAP_ALT_ACCEPT             0x00800000
 190 #define CTX_FLAG_EAP_ALT_REJECT             0x01000000
 191 #define CTX_FLAG_EAP_CHBIND_ACCEPT          0x02000000
 192 #define CTX_FLAG_EAP_TRIGGER_START          0x04000000
 193 #define CTX_FLAG_EAP_MASK                   0xFFFF0000
 194
 195 #define CONFIG_BLOB_CLIENT_CERT             0
 196 #define CONFIG_BLOB_PRIVATE_KEY             1
 197 #define CONFIG_BLOB_CA_CERT                 2
 198 #define CONFIG_BLOB_MAX                     3
 199
 200 struct gss_eap_initiator_ctx {
 201     unsigned int idleWhile;
 202     struct eap_peer_config eapPeerConfig;
 203     struct eap_sm *eap;
 204     struct wpabuf reqData;
 205     struct wpabuf *chbindData;
 206     unsigned int chbindReqFlags;
 207     struct wpa_config_blob configBlobs[CONFIG_BLOB_MAX];
 208 };
 209
 210 #ifdef GSSEAP_ENABLE_ACCEPTOR
 211 struct gss_eap_acceptor_ctx {
 212     struct rs_context *radContext;
 213     struct rs_connection *radConn;
 214     char *radServer;
 215     gss_buffer_desc state;
 216     rs_avp *vps;
 217 };
 218 #endif
 219
 220 #ifdef HAVE_HEIMDAL_VERSION
 221 struct gss_ctx_id_t_desc_struct
 222 #else
 223 struct gss_ctx_id_struct
 224 #endif
 225 {
 226     GSSEAP_MUTEX mutex;
 227     enum gss_eap_state state;
 228     OM_uint32 flags;
 229     OM_uint32 gssFlags;
 230     gss_OID mechanismUsed;
 231     krb5_cksumtype checksumType;
 232     krb5_enctype encryptionType;
 233     krb5_keyblock rfc3961Key;
 234     gss_name_t initiatorName;
 235     gss_name_t acceptorName;
 236     time_t expiryTime;
 237     uint64_t sendSeq, recvSeq;
 238     void *seqState;
 239     gss_cred_id_t cred;
 240     union {
 241         struct gss_eap_initiator_ctx initiator;
 242         #define initiatorCtx         ctxU.initiator
 243 #ifdef GSSEAP_ENABLE_ACCEPTOR
 244         struct gss_eap_acceptor_ctx  acceptor;
 245         #define acceptorCtx          ctxU.acceptor
 246 #endif
 247 #ifdef GSSEAP_ENABLE_REAUTH
 248         gss_ctx_id_t                 reauth;
 249         #define reauthCtx            ctxU.reauth
 250 #endif
 251     } ctxU;
 252     const struct gss_eap_token_buffer_set *inputTokens;
 253     const struct gss_eap_token_buffer_set *outputTokens;
 254 };
 255
 256
 257 #define TOK_FLAG_SENDER_IS_ACCEPTOR         0x01
 258 #define TOK_FLAG_WRAP_CONFIDENTIAL          0x02
 259 #define TOK_FLAG_ACCEPTOR_SUBKEY            0x04
 260
 261 #define KEY_USAGE_ACCEPTOR_SEAL             22
 262 #define KEY_USAGE_ACCEPTOR_SIGN             23
 263 #define KEY_USAGE_INITIATOR_SEAL            24
 264 #define KEY_USAGE_INITIATOR_SIGN            25
 265
 266 #define KEY_USAGE_GSSEAP_CHBIND_MIC         60
 267 #define KEY_USAGE_GSSEAP_ACCTOKEN_MIC       61
 268 #define KEY_USAGE_GSSEAP_INITOKEN_MIC       62
 269
 270 /* accept_sec_context.c */
 271 OM_uint32
 272 gssEapAcceptSecContext(OM_uint32 *minor,
 273                        gss_ctx_id_t ctx,
 274                        gss_cred_id_t cred,
 275                        gss_buffer_t input_token,
 276                        gss_channel_bindings_t input_chan_bindings,
 277                        gss_name_t *src_name,
 278                        gss_OID *mech_type,
 279                        gss_buffer_t output_token,
 280                        OM_uint32 *ret_flags,
 281                        OM_uint32 *time_rec,
 282                        gss_cred_id_t *delegated_cred_handle);
 283
 284 /* init_sec_context.c */
 285 OM_uint32
 286 gssEapInitSecContext(OM_uint32 *minor,
 287                      gss_cred_id_t cred,
 288                      gss_ctx_id_t ctx,
 289                      gss_const_name_t target_name,
 290                      gss_OID mech_type,
 291                      OM_uint32 req_flags,
 292                      OM_uint32 time_req,
 293                      gss_channel_bindings_t input_chan_bindings,
 294                      gss_buffer_t input_token,
 295                      gss_OID *actual_mech_type,
 296                      gss_buffer_t output_token,
 297                      OM_uint32 *ret_flags,
 298                      OM_uint32 *time_rec);
 299
 300 /* wrap_iov.c */
 301 OM_uint32
 302 gssEapWrapOrGetMIC(OM_uint32 *minor,
 303                    gss_ctx_id_t ctx,
 304                    int conf_req_flag,
 305                    int *conf_state,
 306                    gss_iov_buffer_desc *iov,
 307                    int iov_count,
 308                    enum gss_eap_token_type toktype);
 309
 310 OM_uint32
 311 gssEapUnwrapOrVerifyMIC(OM_uint32 *minor_status,
 312                         gss_ctx_id_t ctx,
 313                         int *conf_state,
 314                         gss_qop_t *qop_state,
 315                         gss_iov_buffer_desc *iov,
 316                         int iov_count,
 317                         enum gss_eap_token_type toktype);
 318
 319 OM_uint32
 320 gssEapWrapIovLength(OM_uint32 *minor,
 321                     gss_const_ctx_id_t ctx,
 322                     int conf_req_flag,
 323                     gss_qop_t qop_req,
 324                     int *conf_state,
 325                     gss_iov_buffer_desc *iov,
 326                     int iov_count,
 327                     enum gss_eap_token_type tokType);
 328
 329 OM_uint32
 330 gssEapWrap(OM_uint32 *minor,
 331            gss_ctx_id_t ctx,
 332            int conf_req_flag,
 333            gss_qop_t qop_req,
 334            gss_buffer_t input_message_buffer,
 335            int *conf_state,
 336            gss_buffer_t output_message_buffer);
 337
 338 unsigned char
 339 rfc4121Flags(gss_const_ctx_id_t ctx, int receiving);
 340
 341 /* display_status.c */
 342 void
 343 gssEapSaveStatusInfo(OM_uint32 minor, const char *format, ...);
 344
 345 OM_uint32
 346 gssEapDisplayStatus(OM_uint32 *minor,
 347                     OM_uint32 status_value,
 348                     gss_buffer_t status_string);
 349
 350 #define IS_WIRE_ERROR(err)              ((err) >= GSSEAP_RESERVED && \
 351                                          (err) <= GSSEAP_RADIUS_PROT_FAILURE)
 352
 353 #ifdef GSSEAP_ENABLE_ACCEPTOR
 354 #define IS_RADIUS_ERROR(err)            ((err) >= ERROR_TABLE_BASE_rse && \
 355                                          (err) <= ERROR_TABLE_BASE_rse + RSE_MAX)
 356 #else
 357 #define IS_RADIUS_ERROR(err)            (0)
 358 #endif
 359
 360 /* exchange_meta_data.c */
 361 OM_uint32 GSSAPI_CALLCONV
 362 gssEapExchangeMetaData(OM_uint32 *minor,
 363                        gss_const_OID mech,
 364                        gss_cred_id_t cred,
 365                        gss_ctx_id_t *ctx,
 366                        const gss_name_t name,
 367                        OM_uint32 req_flags,
 368                        gss_const_buffer_t meta_data);
 369
 370 /* export_sec_context.c */
 371 OM_uint32
 372 gssEapExportSecContext(OM_uint32 *minor,
 373                        gss_ctx_id_t ctx,
 374                        gss_buffer_t token);
 375
 376 /* import_sec_context.c */
 377 OM_uint32
 378 gssEapImportContext(OM_uint32 *minor,
 379                     gss_buffer_t token,
 380                     gss_ctx_id_t ctx);
 381
 382 /* inquire_sec_context_by_oid.c */
 383 #define NEGOEX_INITIATOR_SALT      "gss-eap-negoex-initiator"
 384 #define NEGOEX_INITIATOR_SALT_LEN  (sizeof(NEGOEX_INITIATOR_SALT) - 1)
 385
 386 #define NEGOEX_ACCEPTOR_SALT       "gss-eap-negoex-acceptor"
 387 #define NEGOEX_ACCEPTOR_SALT_LEN   (sizeof(NEGOEX_ACCEPTOR_SALT) - 1)
 388
 389 /* pseudo_random.c */
 390 OM_uint32
 391 gssEapPseudoRandom(OM_uint32 *minor,
 392                    gss_const_ctx_id_t ctx,
 393                    int prf_key,
 394                    const gss_buffer_t prf_in,
 395                    gss_buffer_t prf_out);
 396
 397 /* query_mechanism_info.c */
 398 OM_uint32
 399 gssQueryMechanismInfo(OM_uint32 *minor,
 400                       gss_const_OID mech_oid,
 401                       unsigned char auth_scheme[16]);
 402
 403 /* query_meta_data.c */
 404 OM_uint32
 405 gssEapQueryMetaData(OM_uint32 *minor,
 406                     gss_const_OID mech GSSEAP_UNUSED,
 407                     gss_cred_id_t cred,
 408                     gss_ctx_id_t *context_handle,
 409                     const gss_name_t name,
 410                     OM_uint32 req_flags GSSEAP_UNUSED,
 411                     gss_buffer_t meta_data);
 412
 413 /* eap_mech.c */
 414 OM_uint32
 415 gssEapInitiatorInit(OM_uint32 *minor);
 416
 417 void
 418 gssEapFinalize(void);
 419
 420 /* Debugging and tracing */
 421
 422 static inline void
 423 gssEapTraceStatus(const char *function,
 424                   OM_uint32 major,
 425                   OM_uint32 minor)
 426 {
 427     gss_buffer_desc gssErrorCodeBuf = GSS_C_EMPTY_BUFFER;
 428     gss_buffer_desc gssMechBuf = GSS_C_EMPTY_BUFFER;
 429     OM_uint32 tmpMajor, tmpMinor;
 430     OM_uint32 messageCtx = 0;
 431
 432     tmpMajor = gss_display_status(&tmpMinor, major,
 433                                   GSS_C_GSS_CODE, GSS_C_NO_OID,
 434                                   &messageCtx, &gssErrorCodeBuf);
 435     if (!GSS_ERROR(tmpMajor)) {
 436         if (minor == 0)
 437             tmpMajor = makeStringBuffer(&tmpMinor, "no minor", &gssMechBuf);
 438         else
 439             tmpMajor = gssEapDisplayStatus(&tmpMinor, minor, &gssMechBuf);
 440     }
 441
 442     if (!GSS_ERROR(tmpMajor))
 443         wpa_printf(MSG_INFO, "%s: %.*s/%.*s",
 444                    function,
 445                    (int)gssErrorCodeBuf.length, (char *)gssErrorCodeBuf.value,
 446                    (int)gssMechBuf.length, (char *)gssMechBuf.value);
 447     else
 448         wpa_printf(MSG_INFO, "%s: %u/%u",
 449                     function, major, minor);
 450
 451     gss_release_buffer(&tmpMinor, &gssErrorCodeBuf);
 452     gss_release_buffer(&tmpMinor, &gssMechBuf);
 453 }
 454
 455 /* If built as a library on Linux, don't respect environment when set*uid */
 456 #ifdef HAVE_SECURE_GETENV
 457 #define getenv secure_getenv
 458 #endif
 459
 460 #ifdef __cplusplus
 461 }
 462 #endif
 463
 464 #endif /* _GSSAPIP_EAP_H_ */