2 * Copyright (c) 2011, JANET(UK)
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6 * modification, are permitted provided that the following conditions
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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"
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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
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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
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29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * Deserialise a context handle.
37 #include "gssapiP_eap.h"
39 #define UPDATE_REMAIN(n) do { \
44 #define CHECK_REMAIN(n) do { \
46 *minor = GSSEAP_TOK_TRUNC; \
47 return GSS_S_DEFECTIVE_TOKEN; \
51 #ifdef GSSEAP_ENABLE_ACCEPTOR
53 gssEapImportPartialContext(OM_uint32 *minor,
59 unsigned char *p = *pBuf;
60 size_t remain = *pRemain;
62 size_t ctxLength, serverLen;
64 /* Length of partial RADIUS context */
66 ctxLength = load_uint32_be(p);
69 CHECK_REMAIN(ctxLength);
70 remain = ctxLength; /* check against partial context length */
72 /* Selected RADIUS server */
74 serverLen = load_uint32_be(p);
78 CHECK_REMAIN(serverLen);
80 ctx->acceptorCtx.radServer = GSSEAP_MALLOC(serverLen + 1);
81 if (ctx->acceptorCtx.radServer == NULL) {
85 memcpy(ctx->acceptorCtx.radServer, p, serverLen);
86 ctx->acceptorCtx.radServer[serverLen] = '\0';
88 UPDATE_REMAIN(serverLen);
91 /* RADIUS state blob */
93 buf.length = load_uint32_be(p);
96 if (buf.length != 0) {
97 CHECK_REMAIN(buf.length);
101 major = duplicateBuffer(minor, &buf, &ctx->acceptorCtx.state);
102 if (GSS_ERROR(major))
105 UPDATE_REMAIN(buf.length);
113 *pRemain -= 4 + ctxLength;
115 return GSS_S_COMPLETE;
117 #endif /* GSSEAP_ENABLE_ACCEPTOR */
120 importMechanismOid(OM_uint32 *minor,
121 unsigned char **pBuf,
126 unsigned char *p = *pBuf;
127 size_t remain = *pRemain;
130 oidBuf.length = load_uint32_be(p);
131 if (remain < 4 + oidBuf.length || oidBuf.length == 0) {
132 *minor = GSSEAP_TOK_TRUNC;
133 return GSS_S_DEFECTIVE_TOKEN;
136 oidBuf.elements = &p[4];
138 major = gssEapCanonicalizeOid(minor, &oidBuf, 0, pOid);
139 if (GSS_ERROR(major))
142 *pBuf += 4 + oidBuf.length;
143 *pRemain -= 4 + oidBuf.length;
146 return GSS_S_COMPLETE;
150 importKerberosKey(OM_uint32 *minor,
151 unsigned char **pBuf,
153 krb5_cksumtype *checksumType,
154 krb5_enctype *pEncryptionType,
157 unsigned char *p = *pBuf;
158 size_t remain = *pRemain;
159 OM_uint32 encryptionType;
164 *minor = GSSEAP_TOK_TRUNC;
165 return GSS_S_DEFECTIVE_TOKEN;
168 *checksumType = load_uint32_be(&p[0]);
169 encryptionType = load_uint32_be(&p[4]);
170 length = load_uint32_be(&p[8]);
172 if ((length != 0) != (encryptionType != ENCTYPE_NULL)) {
173 *minor = GSSEAP_BAD_CONTEXT_TOKEN;
174 return GSS_S_DEFECTIVE_TOKEN;
177 if (remain - 12 < length) {
178 *minor = GSSEAP_TOK_TRUNC;
179 return GSS_S_DEFECTIVE_TOKEN;
182 if (load_buffer(&p[12], length, &tmp) == NULL) {
184 return GSS_S_FAILURE;
187 KRB_KEY_TYPE(key) = encryptionType;
188 KRB_KEY_LENGTH(key) = tmp.length;
189 KRB_KEY_DATA(key) = (unsigned char *)tmp.value;
191 *pBuf += 12 + length;
192 *pRemain -= 12 + length;
193 *pEncryptionType = encryptionType;
196 return GSS_S_COMPLETE;
200 importName(OM_uint32 *minor,
201 unsigned char **pBuf,
206 unsigned char *p = *pBuf;
207 size_t remain = *pRemain;
211 *minor = GSSEAP_TOK_TRUNC;
212 return GSS_S_DEFECTIVE_TOKEN;
215 tmp.length = load_uint32_be(p);
216 if (tmp.length != 0) {
217 if (remain - 4 < tmp.length) {
218 *minor = GSSEAP_TOK_TRUNC;
219 return GSS_S_DEFECTIVE_TOKEN;
224 major = gssEapImportNameInternal(minor, &tmp, pName,
225 EXPORT_NAME_FLAG_COMPOSITE);
226 if (GSS_ERROR(major))
230 *pBuf += 4 + tmp.length;
231 *pRemain -= 4 + tmp.length;
234 return GSS_S_COMPLETE;
238 gssEapImportContext(OM_uint32 *minor,
243 unsigned char *p = (unsigned char *)token->value;
244 size_t remain = token->length;
247 *minor = GSSEAP_TOK_TRUNC;
248 return GSS_S_DEFECTIVE_TOKEN;
250 if (load_uint32_be(&p[0]) != EAP_EXPORT_CONTEXT_V1) {
251 *minor = GSSEAP_BAD_CONTEXT_TOKEN;
252 return GSS_S_DEFECTIVE_TOKEN;
254 ctx->state = load_uint32_be(&p[4]);
255 ctx->flags = load_uint32_be(&p[8]);
256 ctx->gssFlags = load_uint32_be(&p[12]);
261 if (GSSEAP_SM_STATE(ctx) < GSSEAP_STATE_INITIAL ||
262 GSSEAP_SM_STATE(ctx) > GSSEAP_STATE_ESTABLISHED)
263 return GSS_S_DEFECTIVE_TOKEN;
265 /* Only acceptor can export partial context tokens */
266 if (CTX_IS_INITIATOR(ctx) && !CTX_IS_ESTABLISHED(ctx))
267 return GSS_S_DEFECTIVE_TOKEN;
269 major = importMechanismOid(minor, &p, &remain, &ctx->mechanismUsed);
270 if (GSS_ERROR(major))
273 major = importKerberosKey(minor, &p, &remain,
275 &ctx->encryptionType,
277 if (GSS_ERROR(major))
280 major = importName(minor, &p, &remain, &ctx->initiatorName);
281 if (GSS_ERROR(major))
284 major = importName(minor, &p, &remain, &ctx->acceptorName);
285 if (GSS_ERROR(major))
288 /* Check that, if context is established, names are valid */
289 if (CTX_IS_ESTABLISHED(ctx) &&
290 (CTX_IS_INITIATOR(ctx) ? ctx->acceptorName == GSS_C_NO_NAME
291 : ctx->initiatorName == GSS_C_NO_NAME)) {
292 return GSS_S_DEFECTIVE_TOKEN;
295 if (remain < 24 + sequenceSize(ctx->seqState)) {
296 *minor = GSSEAP_TOK_TRUNC;
297 return GSS_S_DEFECTIVE_TOKEN;
299 ctx->expiryTime = (time_t)load_uint64_be(&p[0]);
300 ctx->sendSeq = load_uint64_be(&p[8]);
301 ctx->recvSeq = load_uint64_be(&p[16]);
305 major = sequenceInternalize(minor, &ctx->seqState, &p, &remain);
306 if (GSS_ERROR(major))
308 #ifdef GSSEAP_ENABLE_ACCEPTOR
310 * The partial context should only be expected for unestablished
313 if (!CTX_IS_INITIATOR(ctx) && !CTX_IS_ESTABLISHED(ctx) &&
314 (ctx->flags & CTX_FLAG_KRB_REAUTH) == 0) {
315 major = gssEapImportPartialContext(minor, &p, &remain, ctx);
316 if (GSS_ERROR(major))
325 major = GSS_S_COMPLETE;
331 OM_uint32 KRB5_CALLCONV
332 gss_import_sec_context(OM_uint32 *minor,
333 gss_buffer_t interprocess_token,
334 gss_ctx_id_t *context_handle)
336 OM_uint32 major, tmpMinor;
337 gss_ctx_id_t ctx = GSS_C_NO_CONTEXT;
339 *context_handle = GSS_C_NO_CONTEXT;
341 if (interprocess_token == GSS_C_NO_BUFFER ||
342 interprocess_token->length == 0) {
343 *minor = GSSEAP_TOK_TRUNC;
344 return GSS_S_DEFECTIVE_TOKEN;
347 major = gssEapAllocContext(minor, &ctx);
348 if (GSS_ERROR(major))
351 major = gssEapImportContext(minor, interprocess_token, ctx);
352 if (GSS_ERROR(major))
355 *context_handle = ctx;
358 if (GSS_ERROR(major))
359 gssEapReleaseContext(&tmpMinor, &ctx);