2 * Copyright (c) 2010, JANET(UK)
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
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.
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.
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
33 #include "gssapiP_eap.h"
35 #define RC_CONFIG_FILE SYSCONFDIR "/radiusclient/radiusclient.conf"
38 * Mark a context as ready for cryptographic operations
41 acceptReady(OM_uint32 *minor, gss_ctx_id_t ctx)
45 gss_buffer_desc nameBuf = GSS_C_EMPTY_BUFFER;
47 /* Cache encryption type derived from selected mechanism OID */
48 major = gssEapOidToEnctype(minor, ctx->mechanismUsed,
49 &ctx->encryptionType);
53 vp = rc_avpair_get(ctx->acceptorCtx.avps, PW_USER_NAME, 0);
55 nameBuf.length = vp->lvalue;
56 nameBuf.value = vp->strvalue;
57 } else if (ctx->initiatorName == GSS_C_NO_NAME) {
58 ctx->gssFlags |= GSS_C_ANON_FLAG;
61 if (nameBuf.length != 0 || ctx->initiatorName == GSS_C_NO_NAME) {
62 major = gssEapImportName(minor, &nameBuf, GSS_C_NT_USER_NAME,
68 vp = rc_avpair_get(ctx->acceptorCtx.avps, 0x01370010, 0);
69 if (ctx->encryptionType != ENCTYPE_NULL && vp != NULL) {
70 major = gssEapDeriveRfc3961Key(minor,
71 (unsigned char *)vp->strvalue,
78 major = rfc3961ChecksumTypeForKey(minor, &ctx->rfc3961Key,
84 * draft-howlett-eap-gss says that integrity/confidentialty should
85 * always be advertised as available, but if we have no keying
86 * material it seems confusing to the caller to advertise this.
88 ctx->gssFlags &= ~(GSS_C_INTEG_FLAG | GSS_C_CONF_FLAG);
91 major = sequenceInit(minor,
92 &ctx->seqState, ctx->recvSeq,
93 ((ctx->gssFlags & GSS_C_REPLAY_FLAG) != 0),
94 ((ctx->gssFlags & GSS_C_SEQUENCE_FLAG) != 0),
99 return GSS_S_COMPLETE;
103 eapGssSmAcceptIdentity(OM_uint32 *minor,
106 gss_buffer_t inputToken,
107 gss_channel_bindings_t chanBindings,
108 gss_buffer_t outputToken)
114 unsigned char data[5];
116 gss_buffer_desc pktBuffer;
117 char *config = RC_CONFIG_FILE;
119 if (inputToken != GSS_C_NO_BUFFER && inputToken->length != 0)
120 return GSS_S_DEFECTIVE_TOKEN;
122 assert(ctx->acceptorCtx.radHandle == NULL);
124 if (cred != GSS_C_NO_CREDENTIAL && cred->radiusConfigFile != NULL)
125 config = cred->radiusConfigFile;
127 rh = ctx->acceptorCtx.radHandle = rc_read_config(config);
130 return GSS_S_FAILURE;
133 if (rc_read_dictionary(rh, rc_conf_str(rh, "dictionary")) != 0) {
135 return GSS_S_FAILURE;
138 if (ctx->acceptorName == GSS_C_NO_NAME &&
139 cred != GSS_C_NO_CREDENTIAL &&
140 cred->name != GSS_C_NO_NAME) {
141 major = gss_duplicate_name(minor, cred->name, &ctx->acceptorName);
142 if (GSS_ERROR(major))
146 pkt.pdu.code = EAP_CODE_REQUEST;
147 pkt.pdu.identifier = 0;
148 pkt.pdu.length = htons(sizeof(pkt.data));
149 pkt.data[4] = EAP_TYPE_IDENTITY;
151 pktBuffer.length = sizeof(pkt.data);
152 pktBuffer.value = pkt.data;
154 major = duplicateBuffer(minor, &pktBuffer, outputToken);
155 if (GSS_ERROR(major))
158 ctx->state = EAP_STATE_AUTHENTICATE;
160 return GSS_S_CONTINUE_NEEDED;
164 importInitiatorIdentity(OM_uint32 *minor,
166 gss_buffer_t inputToken,
167 gss_buffer_t nameBuf)
169 OM_uint32 major, tmpMinor;
170 struct eap_hdr *pdu = (struct eap_hdr *)inputToken->value;
171 unsigned char *pos = (unsigned char *)(pdu + 1);
174 assert(pdu->code == EAP_CODE_RESPONSE);
175 assert(pos[0] == EAP_TYPE_IDENTITY);
177 nameBuf->value = pos + 1;
178 nameBuf->length = inputToken->length - sizeof(*pdu) - 1;
180 major = gssEapImportName(minor, nameBuf, GSS_C_NT_USER_NAME, &name);
181 if (GSS_ERROR(major))
184 gssEapReleaseName(&tmpMinor, &ctx->initiatorName);
185 ctx->initiatorName = name;
187 return GSS_S_COMPLETE;
191 eapGssSmAcceptAuthenticate(OM_uint32 *minor,
194 gss_buffer_t inputToken,
195 gss_channel_bindings_t chanBindings,
196 gss_buffer_t outputToken)
198 OM_uint32 major, tmpMinor;
200 VALUE_PAIR *send = NULL;
201 VALUE_PAIR *received = NULL;
202 rc_handle *rh = ctx->acceptorCtx.radHandle;
203 char msgBuffer[4096];
206 gss_buffer_desc nameBuf = GSS_C_EMPTY_BUFFER;
208 pdu = (struct eap_hdr *)inputToken->value;
209 pos = (unsigned char *)(pdu + 1);
211 if (inputToken->length > sizeof(*pdu) &&
212 pdu->code == EAP_CODE_RESPONSE &&
213 pos[0] == EAP_TYPE_IDENTITY) {
214 major = importInitiatorIdentity(minor, ctx, inputToken, &nameBuf);
215 if (GSS_ERROR(major))
218 major = addAvpFromBuffer(minor, rh, &send, PW_USER_NAME, &nameBuf);
219 if (GSS_ERROR(major))
223 major = addAvpFromBuffer(minor, rh, &send, PW_EAP_MESSAGE, inputToken);
224 if (GSS_ERROR(major))
227 if (ctx->acceptorCtx.lastStatus == CHALLENGE_RC) {
228 major = addAvpFromBuffer(minor, rh, &send, PW_STATE,
229 &ctx->acceptorCtx.state);
230 if (GSS_ERROR(major))
233 gss_release_buffer(&tmpMinor, &ctx->acceptorCtx.state);
236 code = rc_auth(rh, 0, send, &received, msgBuffer);
240 major = GSS_S_CONTINUE_NEEDED;
243 major = GSS_S_UNAVAILABLE;
246 major = GSS_S_DEFECTIVE_CREDENTIAL;
249 major = GSS_S_FAILURE;
253 if (GSS_ERROR(major))
256 ctx->acceptorCtx.lastStatus = code;
258 major = getBufferFromAvps(minor, received, PW_EAP_MESSAGE,
260 if ((major == GSS_S_UNAVAILABLE && code != OK_RC) ||
264 if (code == CHALLENGE_RC) {
265 major = getBufferFromAvps(minor, received, PW_STATE,
266 &ctx->acceptorCtx.state, TRUE);
267 if (major != GSS_S_UNAVAILABLE && GSS_ERROR(major))
270 ctx->acceptorCtx.avps = received;
273 major = acceptReady(minor, ctx);
274 if (GSS_ERROR(major))
277 ctx->state = EAP_STATE_GSS_CHANNEL_BINDINGS;
280 major = GSS_S_CONTINUE_NEEDED;
283 if (received != NULL)
284 rc_avpair_free(received);
290 eapGssSmAcceptGssChannelBindings(OM_uint32 *minor,
293 gss_buffer_t inputToken,
294 gss_channel_bindings_t chanBindings,
295 gss_buffer_t outputToken)
298 gss_iov_buffer_desc iov[2];
300 outputToken->length = 0;
301 outputToken->value = NULL;
303 if (chanBindings == GSS_C_NO_CHANNEL_BINDINGS) {
304 ctx->state = EAP_STATE_ESTABLISHED;
305 return GSS_S_COMPLETE;
308 if (inputToken->length < 14) {
309 return GSS_S_DEFECTIVE_TOKEN;
312 iov[0].type = GSS_IOV_BUFFER_TYPE_DATA;
313 iov[0].buffer.length = 0;
314 iov[0].buffer.value = NULL;
316 if (chanBindings != GSS_C_NO_CHANNEL_BINDINGS)
317 iov[0].buffer = chanBindings->application_data;
319 iov[1].type = GSS_IOV_BUFFER_TYPE_HEADER;
320 iov[1].buffer.length = 16;
321 iov[1].buffer.value = (unsigned char *)inputToken->value - 2;
323 assert(load_uint16_be(iov[1].buffer.value) == TOK_TYPE_GSS_CB);
325 iov[2].type = GSS_IOV_BUFFER_TYPE_TRAILER;
326 iov[2].buffer.length = inputToken->length - 14;
327 iov[2].buffer.value = (unsigned char *)inputToken->value + 14;
329 major = gssEapUnwrapOrVerifyMIC(minor, ctx, NULL, NULL,
330 iov, 3, TOK_TYPE_GSS_CB);
331 if (major == GSS_S_COMPLETE) {
332 ctx->state = EAP_STATE_ESTABLISHED;
336 gss_release_buffer(&tmpMinor, &iov[0].buffer);
343 eapGssSmAcceptEstablished(OM_uint32 *minor,
346 gss_buffer_t inputToken,
347 gss_channel_bindings_t chanBindings,
348 gss_buffer_t outputToken)
350 /* Called with already established context */
352 return GSS_S_BAD_STATUS;
355 static struct gss_eap_acceptor_sm {
356 enum gss_eap_token_type inputTokenType;
357 enum gss_eap_token_type outputTokenType;
358 OM_uint32 (*processToken)(OM_uint32 *,
362 gss_channel_bindings_t,
364 } eapGssAcceptorSm[] = {
365 { TOK_TYPE_EAP_RESP, TOK_TYPE_EAP_REQ, eapGssSmAcceptIdentity },
366 { TOK_TYPE_EAP_RESP, TOK_TYPE_EAP_REQ, eapGssSmAcceptAuthenticate },
367 { TOK_TYPE_GSS_CB, TOK_TYPE_NONE, eapGssSmAcceptGssChannelBindings },
368 { TOK_TYPE_NONE, TOK_TYPE_NONE, eapGssSmAcceptEstablished },
372 gss_accept_sec_context(OM_uint32 *minor,
373 gss_ctx_id_t *context_handle,
375 gss_buffer_t input_token,
376 gss_channel_bindings_t input_chan_bindings,
377 gss_name_t *src_name,
379 gss_buffer_t output_token,
380 OM_uint32 *ret_flags,
382 gss_cred_id_t *delegated_cred_handle)
385 OM_uint32 tmpMajor, tmpMinor;
386 gss_ctx_id_t ctx = *context_handle;
387 struct gss_eap_acceptor_sm *sm = NULL;
388 gss_buffer_desc innerInputToken = GSS_C_EMPTY_BUFFER;
389 gss_buffer_desc innerOutputToken = GSS_C_EMPTY_BUFFER;
393 output_token->length = 0;
394 output_token->value = NULL;
396 if (cred != GSS_C_NO_CREDENTIAL && !(cred->flags & CRED_FLAG_ACCEPT)) {
397 return GSS_S_NO_CRED;
400 if (input_token == GSS_C_NO_BUFFER || input_token->length == 0) {
401 return GSS_S_DEFECTIVE_TOKEN;
404 if (ctx == GSS_C_NO_CONTEXT) {
405 major = gssEapAllocContext(minor, &ctx);
406 if (GSS_ERROR(major))
409 *context_handle = ctx;
412 GSSEAP_MUTEX_LOCK(&ctx->mutex);
414 sm = &eapGssAcceptorSm[ctx->state];
416 major = gssEapVerifyToken(minor, ctx, input_token,
417 sm->inputTokenType, &innerInputToken);
418 if (GSS_ERROR(major))
421 /* If credentials were provided, check they're usable with this mech */
422 if (!gssEapCredAvailable(cred, ctx->mechanismUsed)) {
423 major = GSS_S_BAD_MECH;
428 sm = &eapGssAcceptorSm[ctx->state];
430 major = (sm->processToken)(minor,
436 if (GSS_ERROR(major))
438 } while (major == GSS_S_CONTINUE_NEEDED && innerOutputToken.length == 0);
440 if (mech_type != NULL) {
441 if (!gssEapInternalizeOid(ctx->mechanismUsed, mech_type))
442 duplicateOid(&tmpMinor, ctx->mechanismUsed, mech_type);
444 if (innerOutputToken.length != 0) {
445 tmpMajor = gssEapMakeToken(&tmpMinor, ctx, &innerOutputToken,
446 sm->outputTokenType, output_token);
447 if (GSS_ERROR(tmpMajor)) {
453 if (ret_flags != NULL)
454 *ret_flags = ctx->gssFlags;
455 if (delegated_cred_handle != NULL)
456 *delegated_cred_handle = GSS_C_NO_CREDENTIAL;
458 if (major == GSS_S_COMPLETE) {
459 if (src_name != NULL && ctx->initiatorName != GSS_C_NO_NAME) {
460 major = gss_duplicate_name(&tmpMinor, ctx->initiatorName, src_name);
461 if (GSS_ERROR(major))
464 if (time_rec != NULL)
465 gss_context_time(&tmpMinor, ctx, time_rec);
468 assert(ctx->state == EAP_STATE_ESTABLISHED || major == GSS_S_CONTINUE_NEEDED);
471 GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
473 if (GSS_ERROR(major))
474 gssEapReleaseContext(&tmpMinor, context_handle);
476 gss_release_buffer(&tmpMinor, &innerOutputToken);