* 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.
+ */
#include "gssapiP_eap.h"
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 acceptor_flag;
+ unsigned char *outbuf = NULL;
+ unsigned char *tbuf = NULL;
+ int key_usage;
+ size_t rrc = 0;
+ unsigned int gss_headerlen, gss_trailerlen;
+ size_t data_length, assoc_data_length;
+
+ if (!CTX_IS_ESTABLISHED(ctx)) {
+ return GSS_S_NO_CONTEXT;
+ }
+
+ acceptor_flag = CTX_IS_INITIATOR(ctx) ? 0 : TOK_FLAG_SENDER_IS_ACCEPTOR;
+ key_usage = ((toktype == TOK_TYPE_WRAP)
+ ? (CTX_IS_INITIATOR(ctx)
+ ? KRB_USAGE_INITIATOR_SEAL
+ : KRB_USAGE_ACCEPTOR_SEAL)
+ : (CTX_IS_INITIATOR(ctx)
+ ? KRB_USAGE_INITIATOR_SIGN
+ : KRB_USAGE_ACCEPTOR_SIGN));
+
+ gssEapIovMessageLength(iov, iov_count, &data_length, &assoc_data_length);
+
+ header = gssEapLocateIov(iov, iov_count, GSS_IOV_BUFFER_TYPE_HEADER);
+ if (header == NULL) {
+ *minor = EINVAL;
+ 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);
+
+ if (toktype == TOK_TYPE_WRAP && conf_req_flag) {
+ unsigned int k5_headerlen, k5_trailerlen, k5_padlen;
+ size_t ec = 0;
+ size_t conf_data_length = data_length - assoc_data_length;
+
+ code = krb5_c_crypto_length(ctx->kerberosCtx, ctx->encryptionType,
+ KRB5_CRYPTO_TYPE_HEADER, &k5_headerlen);
+ if (code != 0)
+ goto cleanup;
+
+ code = krb5_c_padding_length(ctx->kerberosCtx, ctx->encryptionType,
+ conf_data_length + 16 /* E(Header) */,
+ &k5_padlen);
+ if (code != 0)
+ goto cleanup;
+
+ if (k5_padlen == 0 && (ctx->gssFlags & GSS_C_DCE_STYLE)) {
+ /* Windows rejects AEAD tokens with non-zero EC */
+ code = krb5_c_block_size(ctx->kerberosCtx, ctx->encryptionType, &ec);
+ if (code != 0)
+ goto cleanup;
+ } else
+ ec = k5_padlen;
+
+ code = krb5_c_crypto_length(ctx->kerberosCtx, ctx->encryptionType,
+ KRB5_CRYPTO_TYPE_TRAILER, &k5_trailerlen);
+ if (code != 0)
+ goto cleanup;
+
+ gss_headerlen = 16 /* Header */ + k5_headerlen;
+ gss_trailerlen = ec + 16 /* E(Header) */ + k5_trailerlen;
+
+ if (trailer == NULL) {
+ rrc = gss_trailerlen;
+ /* Workaround for Windows bug where it rotates by EC + RRC */
+ if (ctx->gssFlags & GSS_C_DCE_STYLE)
+ rrc -= ec;
+ gss_headerlen += gss_trailerlen;
+ }
+
+ if (header->type & GSS_IOV_BUFFER_FLAG_ALLOCATE) {
+ code = gssEapAllocIov(header, (size_t) gss_headerlen);
+ } else if (header->buffer.length < gss_headerlen)
+ code = KRB5_BAD_MSIZE;
+ if (code != 0)
+ goto cleanup;
+ outbuf = (unsigned char *)header->buffer.value;
+ header->buffer.length = (size_t) gss_headerlen;
+
+ if (trailer != NULL) {
+ if (trailer->type & GSS_IOV_BUFFER_FLAG_ALLOCATE)
+ code = gssEapAllocIov(trailer, (size_t) gss_trailerlen);
+ else if (trailer->buffer.length < gss_trailerlen)
+ code = KRB5_BAD_MSIZE;
+ if (code != 0)
+ goto cleanup;
+ trailer->buffer.length = (size_t) gss_trailerlen;
+ }
+
+ /* TOK_ID */
+ store_16_be((uint16_t)toktype, outbuf);
+ /* flags */
+ outbuf[2] = (acceptor_flag
+ | (conf_req_flag ? TOK_FLAG_WRAP_CONFIDENTIAL : 0)
+ | (0 ? TOK_FLAG_ACCEPTOR_SUBKEY : 0));
+ /* filler */
+ outbuf[3] = 0xFF;
+ /* EC */
+ store_16_be(ec, outbuf + 4);
+ /* RRC */
+ store_16_be(0, outbuf + 6);
+ store_64_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(ctx->kerberosCtx,
+ ((ctx->gssFlags & GSS_C_DCE_STYLE) != 0),
+ ec, rrc, ctx->encryptionKey,
+ key_usage, 0, iov, iov_count);
+ if (code != 0)
+ goto cleanup;
+
+ /* RRC */
+ store_16_be(rrc, outbuf + 6);
+
+ ctx->sendSeq++;
+ } else if (toktype == TOK_TYPE_WRAP && !conf_req_flag) {
+ wrap_with_checksum:
+
+ gss_headerlen = 16;
+
+ code = krb5_c_crypto_length(ctx->kerberosCtx, ctx->encryptionType,
+ KRB5_CRYPTO_TYPE_CHECKSUM,
+ &gss_trailerlen);
+ if (code != 0)
+ goto cleanup;
+
+ assert(gss_trailerlen <= 0xFFFF);
+
+ if (trailer == NULL) {
+ rrc = gss_trailerlen;
+ gss_headerlen += gss_trailerlen;
+ }
+
+ if (header->type & GSS_IOV_BUFFER_FLAG_ALLOCATE)
+ code = gssEapAllocIov(header, (size_t) gss_headerlen);
+ else if (header->buffer.length < gss_headerlen)
+ code = KRB5_BAD_MSIZE;
+ if (code != 0)
+ goto cleanup;
+ outbuf = (unsigned char *)header->buffer.value;
+ header->buffer.length = (size_t) gss_headerlen;
+
+ if (trailer != NULL) {
+ if (trailer->type & GSS_IOV_BUFFER_FLAG_ALLOCATE)
+ code = gssEapAllocIov(trailer, (size_t) gss_trailerlen);
+ else if (trailer->buffer.length < gss_trailerlen)
+ code = KRB5_BAD_MSIZE;
+ if (code != 0)
+ goto cleanup;
+ trailer->buffer.length = (size_t) gss_trailerlen;
+ }
+
+ /* TOK_ID */
+ store_16_be((uint16_t)toktype, outbuf);
+ /* flags */
+ outbuf[2] = (acceptor_flag
+ | (0 ? TOK_FLAG_ACCEPTOR_SUBKEY : 0));
+ /* filler */
+ outbuf[3] = 0xFF;
+ if (toktype == TOK_TYPE_WRAP) {
+ /* Use 0 for checksum calculation, substitute
+ * checksum length later.
+ */
+ /* EC */
+ store_16_be(0, outbuf + 4);
+ /* RRC */
+ store_16_be(0, outbuf + 6);
+ } else {
+ /* MIC and DEL store 0xFF in EC and RRC */
+ store_16_be(0xFFFF, outbuf + 4);
+ store_16_be(0xFFFF, outbuf + 6);
+ }
+ store_64_be(ctx->sendSeq, outbuf + 8);
+
+ code = gssEapSign(ctx->kerberosCtx, ctx->checksumType,
+ rrc, ctx->encryptionKey, key_usage,
+ iov, iov_count);
+ if (code != 0)
+ goto cleanup;
+
+ ctx->sendSeq++;
+
+ if (toktype == TOK_TYPE_WRAP) {
+ /* Fix up EC field */
+ store_16_be(gss_trailerlen, outbuf + 4);
+ /* Fix up RRC field */
+ store_16_be(rrc, outbuf + 6);
+ }
+ } else if (toktype == TOK_TYPE_MIC) {
+ trailer = NULL;
+ goto wrap_with_checksum;
+ } else if (toktype == TOK_TYPE_DELETE) {
+ goto wrap_with_checksum;
+ } else {
+ abort();
+ }
+
+ code = 0;
+
+cleanup:
+ if (code != 0)
+ gssEapReleaseIov(iov, iov_count);
+
+ *minor = code;
+
+ if (code == 0)
+ return GSS_S_FAILURE;
+ else
+ return GSS_S_COMPLETE;
+}
+
+OM_uint32
gss_wrap_iov(OM_uint32 *minor,
gss_ctx_id_t ctx,
int conf_req_flag,
gss_iov_buffer_desc *iov,
int iov_count)
{
- GSSEAP_NOT_IMPLEMENTED;
+ return gssEapWrapOrGetMIC(minor, ctx, conf_req_flag, conf_state,
+ iov, iov_count, TOK_TYPE_WRAP);
}
projects / mech_eap.orig / blobdiff