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/*
* AEAD support
*/
#include "mech_locl.h"
/**
* Encrypts or sign the data.
*
* This is a more complicated version of gss_wrap(), it allows the
* caller to use AEAD data (signed header/trailer) and allow greater
* controll over where the encrypted data is placed.
*
* The maximum packet size is gss_context_stream_sizes.max_msg_size.
*
* The caller needs provide the folloing buffers when using in conf_req_flag=1 mode:
*
* - HEADER (of size gss_context_stream_sizes.header)
* { DATA or SIGN_ONLY } (optional, zero or more)
* PADDING (of size gss_context_stream_sizes.blocksize, if zero padding is zero, can be omitted)
* TRAILER (of size gss_context_stream_sizes.trailer)
*
* - on DCE-RPC mode, the caller can skip PADDING and TRAILER if the
* DATA elements is padded to a block bountry and header is of at
* least size gss_context_stream_sizes.header + gss_context_stream_sizes.trailer.
*
* HEADER, PADDING, TRAILER will be shrunken to the size required to transmit any of them too large.
*
* To generate gss_wrap() compatible packets, use: HEADER | DATA | PADDING | TRAILER
*
* When used in conf_req_flag=0,
*
* - HEADER (of size gss_context_stream_sizes.header)
* { DATA or SIGN_ONLY } (optional, zero or more)
* PADDING (of size gss_context_stream_sizes.blocksize, if zero padding is zero, can be omitted)
* TRAILER (of size gss_context_stream_sizes.trailer)
*
*
* The input sizes of HEADER, PADDING and TRAILER can be fetched using gss_wrap_iov_length() or
* gss_context_query_attributes().
*
* @ingroup gssapi
*/
OM_uint32 GSSAPI_LIB_FUNCTION
gss_wrap_iov(OM_uint32 * minor_status,
gss_ctx_id_t context_handle,
int conf_req_flag,
gss_qop_t qop_req,
int * conf_state,
gss_iov_buffer_desc *iov,
int iov_count)
{
struct _gss_context *ctx = (struct _gss_context *) context_handle;
gssapi_mech_interface m;
if (minor_status)
*minor_status = 0;
if (conf_state)
*conf_state = 0;
if (ctx == NULL)
return GSS_S_NO_CONTEXT;
if (iov == NULL && iov_count != 0)
return GSS_S_CALL_INACCESSIBLE_READ;
m = ctx->gc_mech;
if (m->gm_wrap_iov == NULL)
return GSS_S_UNAVAILABLE;
return (m->gm_wrap_iov)(minor_status, ctx->gc_ctx,
conf_req_flag, qop_req, conf_state,
iov, iov_count);
}
/**
* Decrypt or verifies the signature on the data.
*
*
* @ingroup gssapi
*/
OM_uint32 GSSAPI_LIB_FUNCTION
gss_unwrap_iov(OM_uint32 *minor_status,
gss_ctx_id_t context_handle,
int *conf_state,
gss_qop_t *qop_state,
gss_iov_buffer_desc *iov,
int iov_count)
{
struct _gss_context *ctx = (struct _gss_context *) context_handle;
gssapi_mech_interface m;
if (minor_status)
*minor_status = 0;
if (conf_state)
*conf_state = 0;
if (qop_state)
*qop_state = 0;
if (ctx == NULL)
return GSS_S_NO_CONTEXT;
if (iov == NULL && iov_count != 0)
return GSS_S_CALL_INACCESSIBLE_READ;
m = ctx->gc_mech;
if (m->gm_unwrap_iov == NULL)
return GSS_S_UNAVAILABLE;
return (m->gm_unwrap_iov)(minor_status, ctx->gc_ctx,
conf_state, qop_state,
iov, iov_count);
}
/**
* Update the length fields in iov buffer for the types:
* - GSS_IOV_BUFFER_TYPE_HEADER
* - GSS_IOV_BUFFER_TYPE_PADDING
* - GSS_IOV_BUFFER_TYPE_TRAILER
*
* Consider using gss_context_query_attributes() to fetch the data instead.
*
* @ingroup gssapi
*/
OM_uint32 GSSAPI_LIB_FUNCTION
gss_wrap_iov_length(OM_uint32 * minor_status,
gss_ctx_id_t context_handle,
int conf_req_flag,
gss_qop_t qop_req,
int *conf_state,
gss_iov_buffer_desc *iov,
int iov_count)
{
struct _gss_context *ctx = (struct _gss_context *) context_handle;
gssapi_mech_interface m;
if (minor_status)
*minor_status = 0;
if (conf_state)
*conf_state = 0;
if (ctx == NULL)
return GSS_S_NO_CONTEXT;
if (iov == NULL && iov_count != 0)
return GSS_S_CALL_INACCESSIBLE_READ;
m = ctx->gc_mech;
if (m->gm_wrap_iov_length == NULL)
return GSS_S_UNAVAILABLE;
return (m->gm_wrap_iov_length)(minor_status, ctx->gc_ctx,
conf_req_flag, qop_req, conf_state,
iov, iov_count);
}
/**
* Free all buffer allocated by gss_wrap_iov() or gss_unwrap_iov() by
* looking at the GSS_IOV_BUFFER_TYPE_FLAG_ALLOCATED flag.
*
* @ingroup gssapi
*/
OM_uint32 GSSAPI_LIB_FUNCTION
gss_release_iov_buffer(OM_uint32 *minor_status,
gss_iov_buffer_desc *iov,
int iov_count)
{
OM_uint32 junk;
size_t i;
if (minor_status)
*minor_status = 0;
if (iov == NULL && iov_count != 0)
return GSS_S_CALL_INACCESSIBLE_READ;
for (i = 0; i < iov_count; i++) {
if ((iov[i].type & GSS_IOV_BUFFER_TYPE_FLAG_ALLOCATED) == 0)
continue;
gss_release_buffer(&junk, &iov[i].buffer);
iov[i].type &= ~GSS_IOV_BUFFER_TYPE_FLAG_ALLOCATED;
}
return GSS_S_COMPLETE;
}
/**
* Query the context for parameters.
*
* SSPI equivalent if this function is QueryContextAttributes.
*
* - GSS_C_ATTR_STREAM_SIZES data is a gss_context_stream_sizes.
*
* @ingroup gssapi
*/
static gss_OID_desc gss_c_attr_stream_sizes_desc =
{10, rk_UNCONST("\x2a\x86\x48\x86\xf7\x12\x01\x02\x01\x03")};
gss_OID GSSAPI_LIB_VARIABLE GSS_C_ATTR_STREAM_SIZES =
&gss_c_attr_stream_sizes_desc;
OM_uint32 GSSAPI_LIB_FUNCTION
gss_context_query_attributes(OM_uint32 *minor_status,
gss_OID attribute,
void *data,
size_t len)
{
if (minor_status)
*minor_status = 0;
if (gss_oid_equal(GSS_C_ATTR_STREAM_SIZES, attribute)) {
memset(data, 0, len);
return GSS_S_COMPLETE;
}
return GSS_S_FAILURE;
}
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