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34 * Context establishment state machine.
37 #include "gssapiP_eap.h"
40 #define SM_FLAG_TRANSITED 0x80000000
42 #define SM_ASSERT_VALID(ctx, status) do { \
43 assert(GSS_ERROR((status)) || \
44 ((status) == GSS_S_CONTINUE_NEEDED && ((ctx)->state > GSSEAP_STATE_INITIAL && (ctx)->state < GSSEAP_STATE_ESTABLISHED)) || \
45 ((status) == GSS_S_COMPLETE && (ctx)->state == GSSEAP_STATE_ESTABLISHED)); \
50 gssEapStateToString(enum gss_eap_state state)
55 case GSSEAP_STATE_INITIAL:
58 case GSSEAP_STATE_AUTHENTICATE:
61 case GSSEAP_STATE_INITIATOR_EXTS:
64 case GSSEAP_STATE_ACCEPTOR_EXTS:
67 #ifdef GSSEAP_ENABLE_REAUTH
68 case GSSEAP_STATE_REAUTHENTICATE:
72 case GSSEAP_STATE_ESTABLISHED:
84 gssEapSmTransition(gss_ctx_id_t ctx, enum gss_eap_state state)
86 assert(state >= GSSEAP_STATE_INITIAL);
87 assert(state <= GSSEAP_STATE_ESTABLISHED);
89 fprintf(stderr, "GSS-EAP: state transition %s->%s\n",
90 gssEapStateToString(GSSEAP_SM_STATE(ctx)),
91 gssEapStateToString(state));
95 #endif /* GSSEAP_DEBUG */
98 makeErrorToken(OM_uint32 *minor,
99 OM_uint32 majorStatus,
100 OM_uint32 minorStatus,
101 gss_buffer_set_t *outputToken)
104 unsigned char errorData[8];
105 gss_buffer_desc errorBuffer;
107 assert(GSS_ERROR(majorStatus));
109 major = gss_create_empty_buffer_set(minor, outputToken);
110 if (GSS_ERROR(major))
114 * Only return error codes that the initiator could have caused,
115 * to avoid information leakage.
117 #ifdef GSSEAP_ENABLE_ACCEPTOR
118 if (IS_RADIUS_ERROR(minorStatus)) {
119 /* Squash RADIUS error codes */
120 minorStatus = GSSEAP_RADIUS_PROT_FAILURE;
123 if (!IS_WIRE_ERROR(minorStatus)) {
124 /* Don't return non-wire error codes */
125 return GSS_S_COMPLETE;
128 minorStatus -= ERROR_TABLE_BASE_eapg;
130 store_uint32_be(majorStatus, &errorData[0]);
131 store_uint32_be(minorStatus, &errorData[4]);
133 errorBuffer.length = sizeof(errorData);
134 errorBuffer.value = errorData;
136 major = gss_add_buffer_set_member(minor, &errorBuffer, outputToken);
137 if (GSS_ERROR(major))
140 return GSS_S_COMPLETE;
144 allocInnerTokens(OM_uint32 *minor,
146 gss_buffer_set_t *pTokens,
147 OM_uint32 **pTokenTypes)
149 OM_uint32 major, tmpMinor;
150 gss_buffer_set_t tokens = GSS_C_NO_BUFFER_SET;
151 OM_uint32 *tokenTypes = NULL;
153 major = gss_create_empty_buffer_set(minor, &tokens);
154 if (GSS_ERROR(major))
157 assert(tokens->count == 0);
158 assert(tokens->elements == NULL);
160 tokens->elements = (gss_buffer_desc *)GSSEAP_CALLOC(count, sizeof(gss_buffer_desc));
161 if (tokens->elements == NULL) {
162 major = GSS_S_FAILURE;
167 tokenTypes = (OM_uint32 *)GSSEAP_CALLOC(count, sizeof(OM_uint32));
168 if (tokenTypes == NULL) {
169 major = GSS_S_FAILURE;
174 major = GSS_S_COMPLETE;
178 if (GSS_ERROR(major)) {
179 gss_release_buffer_set(&tmpMinor, &tokens);
180 tokens = GSS_C_NO_BUFFER_SET;
181 if (tokenTypes != NULL) {
182 GSSEAP_FREE(tokenTypes);
188 *pTokenTypes = tokenTypes;
194 gssEapSmStep(OM_uint32 *minor,
201 gss_channel_bindings_t chanBindings,
202 gss_buffer_t inputToken,
203 gss_buffer_t outputToken,
204 struct gss_eap_sm *sm, /* ordered by state */
207 OM_uint32 major, tmpMajor, tmpMinor;
208 gss_buffer_desc unwrappedInputToken = GSS_C_EMPTY_BUFFER;
209 gss_buffer_desc unwrappedOutputToken = GSS_C_EMPTY_BUFFER;
210 gss_buffer_set_t innerInputTokens = GSS_C_NO_BUFFER_SET;
211 gss_buffer_set_t innerOutputTokens = GSS_C_NO_BUFFER_SET;
212 OM_uint32 *inputTokenTypes = NULL, *outputTokenTypes = NULL;
213 unsigned int smFlags = 0;
215 int initialContextToken = 0;
216 enum gss_eap_token_type tokType;
222 outputToken->length = 0;
223 outputToken->value = NULL;
225 if (inputToken != GSS_C_NO_BUFFER && inputToken->length != 0) {
226 major = gssEapVerifyToken(minor, ctx, inputToken, &tokType,
227 &unwrappedInputToken);
228 if (GSS_ERROR(major))
231 if (tokType != (CTX_IS_INITIATOR(ctx)
232 ? TOK_TYPE_ACCEPTOR_CONTEXT : TOK_TYPE_INITIATOR_CONTEXT)) {
233 major = GSS_S_DEFECTIVE_TOKEN;
234 *minor = GSSEAP_WRONG_TOK_ID;
237 } else if (!CTX_IS_INITIATOR(ctx) || ctx->state != GSSEAP_STATE_INITIAL) {
238 major = GSS_S_DEFECTIVE_TOKEN;
239 *minor = GSSEAP_WRONG_SIZE;
242 initialContextToken = 1;
245 if (CTX_IS_ESTABLISHED(ctx)) {
246 major = GSS_S_BAD_STATUS;
247 *minor = GSSEAP_CONTEXT_ESTABLISHED;
251 assert(ctx->state < GSSEAP_STATE_ESTABLISHED);
253 major = gssEapDecodeInnerTokens(minor, &unwrappedInputToken,
254 &innerInputTokens, &inputTokenTypes);
255 if (GSS_ERROR(major))
258 assert(innerInputTokens != GSS_C_NO_BUFFER_SET);
260 major = allocInnerTokens(minor, smCount, &innerOutputTokens, &outputTokenTypes);
261 if (GSS_ERROR(major))
264 /* Process all the tokens that are valid for the current state. */
265 for (i = 0; i < smCount; i++) {
266 struct gss_eap_sm *smp = &sm[i];
267 int processToken = 0;
268 gss_buffer_t innerInputToken = GSS_C_NO_BUFFER;
269 OM_uint32 *inputTokenType = NULL;
270 gss_buffer_desc innerOutputToken = GSS_C_EMPTY_BUFFER;
272 if ((smp->validStates & ctx->state) == 0)
276 * We special case the first call to gss_init_sec_context so that
277 * all token providers have the opportunity to generate an initial
278 * context token. Providers where inputTokenType is ITOK_TYPE_NONE
279 * are always called and generally act on state transition boundaries,
280 * for example to advance the state after a series of optional tokens
281 * (as is the case with the extension token exchange) or to generate
282 * a new token after the state was advanced by a provider which did
285 if (smp->inputTokenType == ITOK_TYPE_NONE || initialContextToken) {
287 } else if ((smFlags & SM_FLAG_TRANSITED) == 0) {
288 /* Don't regurgitate a token which belonds to a previous state. */
289 for (j = 0; j < innerInputTokens->count; j++) {
290 if ((inputTokenTypes[j] & ITOK_TYPE_MASK) == smp->inputTokenType) {
292 /* Check for duplicate inner tokens */
293 major = GSS_S_DEFECTIVE_TOKEN;
294 *minor = GSSEAP_DUPLICATE_ITOK;
298 innerInputToken = &innerInputTokens->elements[j];
299 inputTokenType = &inputTokenTypes[j];
302 if (GSS_ERROR(major))
307 enum gss_eap_state oldState = ctx->state;
310 if (inputTokenType != NULL && (*inputTokenType & ITOK_FLAG_CRITICAL))
311 smFlags |= SM_FLAG_INPUT_TOKEN_CRITICAL;
313 major = smp->processToken(minor, cred, ctx, target, mech, reqFlags,
314 timeReq, chanBindings, innerInputToken,
315 &innerOutputToken, &smFlags);
316 if (GSS_ERROR(major))
319 if (inputTokenType != NULL)
320 *inputTokenType |= ITOK_FLAG_VERIFIED;
321 if (ctx->state < oldState)
323 else if (ctx->state != oldState)
324 smFlags |= SM_FLAG_TRANSITED;
326 if (innerOutputToken.value != NULL) {
327 innerOutputTokens->elements[innerOutputTokens->count] = innerOutputToken;
328 assert(smp->outputTokenType != ITOK_TYPE_NONE);
329 outputTokenTypes[innerOutputTokens->count] = smp->outputTokenType;
330 if (smFlags & SM_FLAG_OUTPUT_TOKEN_CRITICAL)
331 outputTokenTypes[innerOutputTokens->count] |= ITOK_FLAG_CRITICAL;
332 innerOutputTokens->count++;
335 * Break out if we made a state transition and have some tokens to send.
337 if ((smFlags & SM_FLAG_TRANSITED) &&
338 ((smFlags & SM_FLAG_FORCE_SEND_TOKEN) || innerOutputTokens->count != 0)) {
339 SM_ASSERT_VALID(ctx, major);
342 } else if ((smp->itokFlags & SM_ITOK_FLAG_REQUIRED) &&
343 smp->inputTokenType != ITOK_TYPE_NONE) {
344 /* Check for required inner tokens */
345 major = GSS_S_DEFECTIVE_TOKEN;
346 *minor = GSSEAP_MISSING_REQUIRED_ITOK;
351 assert(innerOutputTokens->count <= smCount);
353 /* Check we understood all critical tokens sent by peer */
354 if (!GSS_ERROR(major)) {
355 for (j = 0; j < innerInputTokens->count; j++) {
356 if ((inputTokenTypes[j] & ITOK_FLAG_CRITICAL) &&
357 (inputTokenTypes[j] & ITOK_FLAG_VERIFIED) == 0) {
358 major = GSS_S_UNAVAILABLE;
359 *minor = GSSEAP_CRIT_ITOK_UNAVAILABLE;
365 /* Optionaly emit an error token if we are the acceptor */
366 if (GSS_ERROR(major)) {
367 if (CTX_IS_INITIATOR(ctx))
368 goto cleanup; /* return error directly to caller */
370 /* replace any emitted tokens with error token */
371 gss_release_buffer_set(&tmpMinor, &innerOutputTokens);
373 tmpMajor = makeErrorToken(&tmpMinor, major, *minor, &innerOutputTokens);
374 if (GSS_ERROR(tmpMajor)) {
380 if (innerOutputTokens->count != 0)
381 outputTokenTypes[0] = ITOK_TYPE_CONTEXT_ERR | ITOK_FLAG_CRITICAL;
384 /* Format output token from inner tokens */
385 if (innerOutputTokens->count != 0 || /* inner tokens to send */
386 !CTX_IS_INITIATOR(ctx) || /* any leg acceptor */
387 !CTX_IS_ESTABLISHED(ctx)) { /* non-last leg initiator */
388 tmpMajor = gssEapEncodeInnerTokens(&tmpMinor, innerOutputTokens,
389 outputTokenTypes, &unwrappedOutputToken);
390 if (tmpMajor == GSS_S_COMPLETE) {
391 if (CTX_IS_INITIATOR(ctx))
392 tokType = TOK_TYPE_INITIATOR_CONTEXT;
394 tokType = TOK_TYPE_ACCEPTOR_CONTEXT;
396 tmpMajor = gssEapMakeToken(&tmpMinor, ctx, &unwrappedOutputToken,
397 tokType, outputToken);
398 if (GSS_ERROR(tmpMajor)) {
406 /* If the context is established, empty tokens only to be emitted by initiator */
407 assert(!CTX_IS_ESTABLISHED(ctx) || ((outputToken->length == 0) == CTX_IS_INITIATOR(ctx)));
409 SM_ASSERT_VALID(ctx, major);
412 gss_release_buffer_set(&tmpMinor, &innerInputTokens);
413 gss_release_buffer_set(&tmpMinor, &innerOutputTokens);
414 if (inputTokenTypes != NULL)
415 GSSEAP_FREE(inputTokenTypes);
416 if (outputTokenTypes != NULL)
417 gss_release_buffer(&tmpMinor, &unwrappedOutputToken);
418 GSSEAP_FREE(outputTokenTypes);