OM_uint32
gssEapExportSecContext(OM_uint32 *minor,
gss_ctx_id_t ctx,
gss_buffer_t token)
{
OM_uint32 major, tmpMinor;
size_t length;
gss_buffer_desc initiatorName = GSS_C_EMPTY_BUFFER;
gss_buffer_desc acceptorName = GSS_C_EMPTY_BUFFER;
gss_buffer_desc partialCtx = GSS_C_EMPTY_BUFFER;
gss_buffer_desc key;
unsigned char *p;
if ((CTX_IS_INITIATOR(ctx) && !CTX_IS_ESTABLISHED(ctx)) ||
ctx->mechanismUsed == GSS_C_NO_OID) {
*minor = GSSEAP_CONTEXT_INCOMPLETE;
return GSS_S_NO_CONTEXT;
}
key.length = KRB_KEY_LENGTH(&ctx->rfc3961Key);
key.value = KRB_KEY_DATA(&ctx->rfc3961Key);
if (ctx->initiatorName != GSS_C_NO_NAME) {
major = gssEapExportNameInternal(minor, ctx->initiatorName,
&initiatorName,
EXPORT_NAME_FLAG_COMPOSITE);
if (GSS_ERROR(major))
goto cleanup;
}
if (ctx->acceptorName != GSS_C_NO_NAME) {
major = gssEapExportNameInternal(minor, ctx->acceptorName,
&acceptorName,
EXPORT_NAME_FLAG_COMPOSITE);
if (GSS_ERROR(major))
goto cleanup;
}
#ifdef GSSEAP_ENABLE_ACCEPTOR
/*
* The partial context is only transmitted for unestablished acceptor
* contexts.
*/
if (!CTX_IS_INITIATOR(ctx) && !CTX_IS_ESTABLISHED(ctx) &&
(ctx->flags & CTX_FLAG_KRB_REAUTH) == 0) {
major = gssEapExportPartialContext(minor, ctx, &partialCtx);
if (GSS_ERROR(major))
goto cleanup;
}
#endif
length = 16; /* version, state, flags, */
length += 4 + ctx->mechanismUsed->length; /* mechanismUsed */
length += 12 + key.length; /* rfc3961Key.value */
length += 4 + initiatorName.length; /* initiatorName.value */
length += 4 + acceptorName.length; /* acceptorName.value */
length += 24 + sequenceSize(ctx->seqState); /* seqState */
if (partialCtx.value != NULL)
length += 4 + partialCtx.length; /* partialCtx.value */
token->value = GSSEAP_MALLOC(length);
if (token->value == NULL) {
major = GSS_S_FAILURE;
*minor = ENOMEM;
goto cleanup;
}
token->length = length;
p = (unsigned char *)token->value;
store_uint32_be(EAP_EXPORT_CONTEXT_V1, &p[0]); /* version */
store_uint32_be(GSSEAP_SM_STATE(ctx), &p[4]);
store_uint32_be(ctx->flags, &p[8]);
store_uint32_be(ctx->gssFlags, &p[12]);
p = store_oid(ctx->mechanismUsed, &p[16]);
store_uint32_be(ctx->checksumType, &p[0]);
store_uint32_be(ctx->encryptionType, &p[4]);
p = store_buffer(&key, &p[8], FALSE);
p = store_buffer(&initiatorName, p, FALSE);
p = store_buffer(&acceptorName, p, FALSE);
store_uint64_be(ctx->expiryTime, &p[0]);
store_uint64_be(ctx->sendSeq, &p[8]);
store_uint64_be(ctx->recvSeq, &p[16]);
p += 24;
major = sequenceExternalize(minor, ctx->seqState, &p, &length);
if (GSS_ERROR(major))
goto cleanup;
if (partialCtx.value != NULL)
p = store_buffer(&partialCtx, p, FALSE);
GSSEAP_ASSERT(p == (unsigned char *)token->value + token->length);
major = GSS_S_COMPLETE;
*minor = 0;
cleanup:
if (GSS_ERROR(major))
gss_release_buffer(&tmpMinor, token);
gss_release_buffer(&tmpMinor, &initiatorName);
gss_release_buffer(&tmpMinor, &acceptorName);
gss_release_buffer(&tmpMinor, &partialCtx);
return major;
}
OM_uint32
gssEapImportContext(OM_uint32 *minor,
gss_buffer_t token,
gss_ctx_id_t ctx)
{
OM_uint32 major;
unsigned char *p = (unsigned char *)token->value;
size_t remain = token->length;
if (remain < 16) {
*minor = GSSEAP_TOK_TRUNC;
return GSS_S_DEFECTIVE_TOKEN;
}
if (load_uint32_be(&p[0]) != EAP_EXPORT_CONTEXT_V1) {
*minor = GSSEAP_BAD_CONTEXT_TOKEN;
return GSS_S_DEFECTIVE_TOKEN;
}
ctx->state = load_uint32_be(&p[4]);
ctx->flags = load_uint32_be(&p[8]);
ctx->gssFlags = load_uint32_be(&p[12]);
p += 16;
remain -= 16;
/* Validate state */
if (GSSEAP_SM_STATE(ctx) < GSSEAP_STATE_INITIAL ||
GSSEAP_SM_STATE(ctx) > GSSEAP_STATE_ESTABLISHED)
return GSS_S_DEFECTIVE_TOKEN;
/* Only acceptor can export partial context tokens */
if (CTX_IS_INITIATOR(ctx) && !CTX_IS_ESTABLISHED(ctx))
return GSS_S_DEFECTIVE_TOKEN;
major = importMechanismOid(minor, &p, &remain, &ctx->mechanismUsed);
if (GSS_ERROR(major))
return major;
major = importKerberosKey(minor, &p, &remain,
&ctx->checksumType,
&ctx->encryptionType,
&ctx->rfc3961Key);
if (GSS_ERROR(major))
return major;
/* Initiator name OID matches the context mechanism, so it's not encoded */
major = importName(minor, ctx->mechanismUsed, &p, &remain, &ctx->initiatorName);
if (GSS_ERROR(major))
return major;
major = importName(minor, GSS_C_NO_OID, &p, &remain, &ctx->acceptorName);
if (GSS_ERROR(major))
return major;
/* Check that, if context is established, names are valid */
if (CTX_IS_ESTABLISHED(ctx) &&
(CTX_IS_INITIATOR(ctx) ? ctx->acceptorName == GSS_C_NO_NAME
: ctx->initiatorName == GSS_C_NO_NAME)) {
return GSS_S_DEFECTIVE_TOKEN;
}
if (remain < 24 + sequenceSize(ctx->seqState)) {
*minor = GSSEAP_TOK_TRUNC;
return GSS_S_DEFECTIVE_TOKEN;
}
ctx->expiryTime = (time_t)load_uint64_be(&p[0]);
ctx->sendSeq = load_uint64_be(&p[8]);
ctx->recvSeq = load_uint64_be(&p[16]);
p += 24;
remain -= 24;
major = sequenceInternalize(minor, &ctx->seqState, &p, &remain);
if (GSS_ERROR(major))
return major;
#ifdef GSSEAP_ENABLE_ACCEPTOR
/*
* The partial context should only be expected for unestablished
* acceptor contexts.
*/
if (!CTX_IS_INITIATOR(ctx) && !CTX_IS_ESTABLISHED(ctx) &&
(ctx->flags & CTX_FLAG_KRB_REAUTH) == 0) {
major = gssEapImportPartialContext(minor, &p, &remain, ctx);
if (GSS_ERROR(major))
return major;
}
#ifdef GSSEAP_DEBUG
GSSEAP_ASSERT(remain == 0);
#endif
#endif /* GSSEAP_ENABLE_ACCEPTOR */
major = GSS_S_COMPLETE;
*minor = 0;
return major;
}
