* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
+/*
+ * Copyright 2008 by the Massachusetts Institute of Technology.
+ * All Rights Reserved.
+ *
+ * Export of this software from the United States of America may
+ * require a specific license from the United States Government.
+ * It is the responsibility of any person or organization contemplating
+ * export to obtain such a license before exporting.
+ *
+ * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
+ * distribute this software and its documentation for any purpose and
+ * without fee is hereby granted, provided that the above copyright
+ * notice appear in all copies and that both that copyright notice and
+ * this permission notice appear in supporting documentation, and that
+ * the name of M.I.T. not be used in advertising or publicity pertaining
+ * to distribution of the software without specific, written prior
+ * permission. Furthermore if you modify this software you must label
+ * your software as modified software and not distribute it in such a
+ * fashion that it might be confused with the original M.I.T. software.
+ * M.I.T. makes no representations about the suitability of
+ * this software for any purpose. It is provided "as is" without express
+ * or implied warranty.
+ */
+
+/*
+ * Message protection services: wrap with scatter-gather API.
+ */
#include "gssapiP_eap.h"
+unsigned char
+rfc4121Flags(gss_ctx_id_t ctx, int receiving)
+{
+ unsigned char flags;
+ int isAcceptor;
+
+ isAcceptor = !CTX_IS_INITIATOR(ctx);
+ if (receiving)
+ isAcceptor = !isAcceptor;
+
+ flags = 0;
+ if (isAcceptor)
+ flags |= TOK_FLAG_SENDER_IS_ACCEPTOR;
+
+ if ((ctx->flags & CTX_FLAG_KRB_REAUTH) &&
+ (ctx->gssFlags & GSS_C_MUTUAL_FLAG))
+ flags |= TOK_FLAG_ACCEPTOR_SUBKEY;
+
+ return flags;
+}
+
+OM_uint32
+gssEapWrapOrGetMIC(OM_uint32 *minor,
+ gss_ctx_id_t ctx,
+ int conf_req_flag,
+ int *conf_state,
+ gss_iov_buffer_desc *iov,
+ int iov_count,
+ enum gss_eap_token_type toktype)
+{
+ krb5_error_code code = 0;
+ gss_iov_buffer_t header;
+ gss_iov_buffer_t padding;
+ gss_iov_buffer_t trailer;
+ unsigned char flags;
+ unsigned char *outbuf = NULL;
+ unsigned char *tbuf = NULL;
+ int keyUsage;
+ size_t rrc = 0;
+ size_t gssHeaderLen, gssTrailerLen;
+ size_t dataLen, assocDataLen;
+ krb5_context krbContext;
+#ifdef HAVE_HEIMDAL_VERSION
+ krb5_crypto krbCrypto = NULL;
+#endif
+
+ if (ctx->encryptionType == ENCTYPE_NULL) {
+ *minor = GSSEAP_KEY_UNAVAILABLE;
+ return GSS_S_UNAVAILABLE;
+ }
+
+ GSSEAP_KRB_INIT(&krbContext);
+
+ flags = rfc4121Flags(ctx, FALSE);
+
+ if (toktype == TOK_TYPE_WRAP) {
+ keyUsage = CTX_IS_INITIATOR(ctx)
+ ? KEY_USAGE_INITIATOR_SEAL
+ : KEY_USAGE_ACCEPTOR_SEAL;
+ } else {
+ keyUsage = CTX_IS_INITIATOR(ctx)
+ ? KEY_USAGE_INITIATOR_SIGN
+ : KEY_USAGE_ACCEPTOR_SIGN;
+ }
+
+ gssEapIovMessageLength(iov, iov_count, &dataLen, &assocDataLen);
+
+ header = gssEapLocateIov(iov, iov_count, GSS_IOV_BUFFER_TYPE_HEADER);
+ if (header == NULL) {
+ *minor = GSSEAP_MISSING_IOV;
+ return GSS_S_FAILURE;
+ }
+
+ padding = gssEapLocateIov(iov, iov_count, GSS_IOV_BUFFER_TYPE_PADDING);
+ if (padding != NULL)
+ padding->buffer.length = 0;
+
+ trailer = gssEapLocateIov(iov, iov_count, GSS_IOV_BUFFER_TYPE_TRAILER);
+
+#ifdef HAVE_HEIMDAL_VERSION
+ code = krb5_crypto_init(krbContext, &ctx->rfc3961Key, ETYPE_NULL, &krbCrypto);
+ if (code != 0)
+ goto cleanup;
+#endif
+
+ if (toktype == TOK_TYPE_WRAP && conf_req_flag) {
+ size_t krbHeaderLen, krbTrailerLen, krbPadLen;
+ size_t ec = 0, confDataLen = dataLen - assocDataLen;
+
+ code = krbCryptoLength(krbContext, KRB_CRYPTO_CONTEXT(ctx),
+ KRB5_CRYPTO_TYPE_HEADER, &krbHeaderLen);
+ if (code != 0)
+ goto cleanup;
+
+ code = krbPaddingLength(krbContext, KRB_CRYPTO_CONTEXT(ctx),
+ confDataLen + 16 /* E(Header) */,
+ &krbPadLen);
+ if (code != 0)
+ goto cleanup;
+
+ if (krbPadLen == 0 && (ctx->gssFlags & GSS_C_DCE_STYLE)) {
+ /* Windows rejects AEAD tokens with non-zero EC */
+ code = krbBlockSize(krbContext, KRB_CRYPTO_CONTEXT(ctx), &ec);
+ if (code != 0)
+ goto cleanup;
+ } else
+ ec = krbPadLen;
+
+ code = krbCryptoLength(krbContext, KRB_CRYPTO_CONTEXT(ctx),
+ KRB5_CRYPTO_TYPE_TRAILER, &krbTrailerLen);
+ if (code != 0)
+ goto cleanup;
+
+ gssHeaderLen = 16 /* Header */ + krbHeaderLen;
+ gssTrailerLen = ec + 16 /* E(Header) */ + krbTrailerLen;
+
+ if (trailer == NULL) {
+ rrc = gssTrailerLen;
+ /* Workaround for Windows bug where it rotates by EC + RRC */
+ if (ctx->gssFlags & GSS_C_DCE_STYLE)
+ rrc -= ec;
+ gssHeaderLen += gssTrailerLen;
+ }
+
+ if (header->type & GSS_IOV_BUFFER_FLAG_ALLOCATE) {
+ code = gssEapAllocIov(header, (size_t)gssHeaderLen);
+ } else if (header->buffer.length < gssHeaderLen)
+ code = GSSEAP_WRONG_SIZE;
+ if (code != 0)
+ goto cleanup;
+ outbuf = (unsigned char *)header->buffer.value;
+ header->buffer.length = (size_t)gssHeaderLen;
+
+ if (trailer != NULL) {
+ if (trailer->type & GSS_IOV_BUFFER_FLAG_ALLOCATE)
+ code = gssEapAllocIov(trailer, (size_t)gssTrailerLen);
+ else if (trailer->buffer.length < gssTrailerLen)
+ code = GSSEAP_WRONG_SIZE;
+ if (code != 0)
+ goto cleanup;
+ trailer->buffer.length = (size_t)gssTrailerLen;
+ }
+
+ /* TOK_ID */
+ store_uint16_be((uint16_t)toktype, outbuf);
+ /* flags */
+ outbuf[2] = flags
+ | (conf_req_flag ? TOK_FLAG_WRAP_CONFIDENTIAL : 0);
+ /* filler */
+ outbuf[3] = 0xFF;
+ /* EC */
+ store_uint16_be(ec, outbuf + 4);
+ /* RRC */
+ store_uint16_be(0, outbuf + 6);
+ store_uint64_be(ctx->sendSeq, outbuf + 8);
+
+ /*
+ * EC | copy of header to be encrypted, located in
+ * (possibly rotated) trailer
+ */
+ if (trailer == NULL)
+ tbuf = (unsigned char *)header->buffer.value + 16; /* Header */
+ else
+ tbuf = (unsigned char *)trailer->buffer.value;
+
+ memset(tbuf, 0xFF, ec);
+ memcpy(tbuf + ec, header->buffer.value, 16);
+
+ code = gssEapEncrypt(krbContext,
+ ((ctx->gssFlags & GSS_C_DCE_STYLE) != 0),
+ ec, rrc, KRB_CRYPTO_CONTEXT(ctx),
+ keyUsage, iov, iov_count);
+ if (code != 0)
+ goto cleanup;
+
+ /* RRC */
+ store_uint16_be(rrc, outbuf + 6);
+
+ ctx->sendSeq++;
+ } else if (toktype == TOK_TYPE_WRAP && !conf_req_flag) {
+ wrap_with_checksum:
+
+ gssHeaderLen = 16;
+
+ code = krbCryptoLength(krbContext, KRB_CRYPTO_CONTEXT(ctx),
+ KRB5_CRYPTO_TYPE_CHECKSUM, &gssTrailerLen);
+ if (code != 0)
+ goto cleanup;
+
+ assert(gssTrailerLen <= 0xFFFF);
+
+ if (trailer == NULL) {
+ rrc = gssTrailerLen;
+ gssHeaderLen += gssTrailerLen;
+ }
+
+ if (header->type & GSS_IOV_BUFFER_FLAG_ALLOCATE)
+ code = gssEapAllocIov(header, (size_t)gssHeaderLen);
+ else if (header->buffer.length < gssHeaderLen)
+ code = GSSEAP_WRONG_SIZE;
+ if (code != 0)
+ goto cleanup;
+ outbuf = (unsigned char *)header->buffer.value;
+ header->buffer.length = (size_t)gssHeaderLen;
+
+ if (trailer != NULL) {
+ if (trailer->type & GSS_IOV_BUFFER_FLAG_ALLOCATE)
+ code = gssEapAllocIov(trailer, (size_t)gssTrailerLen);
+ else if (trailer->buffer.length < gssTrailerLen)
+ code = GSSEAP_WRONG_SIZE;
+ if (code != 0)
+ goto cleanup;
+ trailer->buffer.length = (size_t)gssTrailerLen;
+ }
+
+ /* TOK_ID */
+ store_uint16_be((uint16_t)toktype, outbuf);
+ /* flags */
+ outbuf[2] = flags;
+ /* filler */
+ outbuf[3] = 0xFF;
+ if (toktype == TOK_TYPE_WRAP) {
+ /* Use 0 for checksum calculation, substitute
+ * checksum length later.
+ */
+ /* EC */
+ store_uint16_be(0, outbuf + 4);
+ /* RRC */
+ store_uint16_be(0, outbuf + 6);
+ } else {
+ /* MIC and DEL store 0xFF in EC and RRC */
+ store_uint16_be(0xFFFF, outbuf + 4);
+ store_uint16_be(0xFFFF, outbuf + 6);
+ }
+ store_uint64_be(ctx->sendSeq, outbuf + 8);
+
+ code = gssEapSign(krbContext, ctx->checksumType, rrc,
+ KRB_CRYPTO_CONTEXT(ctx), keyUsage,
+ iov, iov_count);
+ if (code != 0)
+ goto cleanup;
+
+ ctx->sendSeq++;
+
+ if (toktype == TOK_TYPE_WRAP) {
+ /* Fix up EC field */
+ store_uint16_be(gssTrailerLen, outbuf + 4);
+ /* Fix up RRC field */
+ store_uint16_be(rrc, outbuf + 6);
+ }
+ } else if (toktype == TOK_TYPE_MIC) {
+ trailer = NULL;
+ goto wrap_with_checksum;
+ } else if (toktype == TOK_TYPE_DELETE_CONTEXT) {
+ trailer = NULL;
+ goto wrap_with_checksum;
+ } else {
+ abort();
+ }
+
+ code = 0;
+ if (conf_state != NULL)
+ *conf_state = conf_req_flag;
+
+cleanup:
+ if (code != 0)
+ gssEapReleaseIov(iov, iov_count);
+#ifdef HAVE_HEIMDAL_VERSION
+ if (krbCrypto != NULL)
+ krb5_crypto_destroy(krbContext, krbCrypto);
+#endif
+
+ *minor = code;
+
+ return (code == 0) ? GSS_S_COMPLETE : GSS_S_FAILURE;
+}
+
+OM_uint32
+gss_wrap_iov(OM_uint32 *minor,
+ gss_ctx_id_t ctx,
+ int conf_req_flag,
+ gss_qop_t qop_req,
+ int *conf_state,
+ gss_iov_buffer_desc *iov,
+ int iov_count)
+{
+ OM_uint32 major;
+
+ if (ctx == GSS_C_NO_CONTEXT) {
+ *minor = EINVAL;
+ return GSS_S_CALL_INACCESSIBLE_READ | GSS_S_NO_CONTEXT;
+ }
+
+ if (qop_req != GSS_C_QOP_DEFAULT) {
+ *minor = GSSEAP_UNKNOWN_QOP;
+ return GSS_S_UNAVAILABLE;
+ }
+
+ *minor = 0;
+
+ GSSEAP_MUTEX_LOCK(&ctx->mutex);
+
+ if (!CTX_IS_ESTABLISHED(ctx)) {
+ major = GSS_S_NO_CONTEXT;
+ *minor = GSSEAP_CONTEXT_INCOMPLETE;
+ goto cleanup;
+ }
+
+ major = gssEapWrapOrGetMIC(minor, ctx, conf_req_flag, conf_state,
+ iov, iov_count, TOK_TYPE_WRAP);
+ if (GSS_ERROR(major))
+ goto cleanup;
+
+cleanup:
+ GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
+
+ return major;
+}
projects / mech_eap.orig / blobdiff