static int gssx_dec_option(struct xdr_stream *xdr,
struct gssx_option *opt)
{
int err;
err = gssx_dec_buffer(xdr, &opt->option);
if (err)
return err;
err = gssx_dec_buffer(xdr, &opt->value);
return err;
}
int gssx_dec_accept_sec_context(struct rpc_rqst *rqstp,
struct xdr_stream *xdr,
void *data)
{
struct gssx_res_accept_sec_context *res = data;
u32 value_follows;
int err;
struct page *scratch;
scratch = alloc_page(GFP_KERNEL);
if (!scratch)
return -ENOMEM;
xdr_set_scratch_buffer(xdr, page_address(scratch), PAGE_SIZE);
/* res->status */
err = gssx_dec_status(xdr, &res->status);
if (err)
goto out_free;
/* res->context_handle */
err = gssx_dec_bool(xdr, &value_follows);
if (err)
goto out_free;
if (value_follows) {
err = gssx_dec_ctx(xdr, res->context_handle);
if (err)
goto out_free;
} else {
res->context_handle = NULL;
}
/* res->output_token */
err = gssx_dec_bool(xdr, &value_follows);
if (err)
goto out_free;
if (value_follows) {
err = gssx_dec_buffer(xdr, res->output_token);
if (err)
goto out_free;
} else {
res->output_token = NULL;
}
/* res->delegated_cred_handle */
err = gssx_dec_bool(xdr, &value_follows);
if (err)
goto out_free;
if (value_follows) {
/* we do not support upcall servers sending this data. */
err = -EINVAL;
goto out_free;
}
/* res->options */
err = gssx_dec_option_array(xdr, &res->options);
out_free:
__free_page(scratch);
return err;
}
static int gssx_dec_status(struct xdr_stream *xdr,
struct gssx_status *status)
{
__be32 *p;
int err;
/* status->major_status */
p = xdr_inline_decode(xdr, 8);
if (unlikely(p == NULL))
return -ENOSPC;
p = xdr_decode_hyper(p, &status->major_status);
/* status->mech */
err = gssx_dec_buffer(xdr, &status->mech);
if (err)
return err;
/* status->minor_status */
p = xdr_inline_decode(xdr, 8);
if (unlikely(p == NULL))
return -ENOSPC;
p = xdr_decode_hyper(p, &status->minor_status);
/* status->major_status_string */
err = gssx_dec_buffer(xdr, &status->major_status_string);
if (err)
return err;
/* status->minor_status_string */
err = gssx_dec_buffer(xdr, &status->minor_status_string);
if (err)
return err;
/* status->server_ctx */
err = gssx_dec_buffer(xdr, &status->server_ctx);
if (err)
return err;
/* we assume we have no options for now, so simply consume them */
/* status->options */
err = dummy_dec_opt_array(xdr, &status->options);
return err;
}
static int gssx_dec_name_attr(struct xdr_stream *xdr,
struct gssx_name_attr *attr)
{
int err;
/* attr->attr */
err = gssx_dec_buffer(xdr, &attr->attr);
if (err)
return err;
/* attr->value */
err = gssx_dec_buffer(xdr, &attr->value);
if (err)
return err;
/* attr->extensions */
err = dummy_dec_opt_array(xdr, &attr->extensions);
return err;
}
int gssx_dec_accept_sec_context(struct rpc_rqst *rqstp,
struct xdr_stream *xdr,
struct gssx_res_accept_sec_context *res)
{
u32 value_follows;
int err;
/* res->status */
err = gssx_dec_status(xdr, &res->status);
if (err)
return err;
/* res->context_handle */
err = gssx_dec_bool(xdr, &value_follows);
if (err)
return err;
if (value_follows) {
err = gssx_dec_ctx(xdr, res->context_handle);
if (err)
return err;
} else {
res->context_handle = NULL;
}
/* res->output_token */
err = gssx_dec_bool(xdr, &value_follows);
if (err)
return err;
if (value_follows) {
err = gssx_dec_buffer(xdr, res->output_token);
if (err)
return err;
} else {
res->output_token = NULL;
}
/* res->delegated_cred_handle */
err = gssx_dec_bool(xdr, &value_follows);
if (err)
return err;
if (value_follows) {
/* we do not support upcall servers sending this data. */
return -EINVAL;
}
/* res->options */
err = gssx_dec_option_array(xdr, &res->options);
return err;
}
static int gssx_dec_ctx(struct xdr_stream *xdr,
struct gssx_ctx *ctx)
{
__be32 *p;
int err;
/* ctx->exported_context_token */
err = gssx_dec_buffer(xdr, &ctx->exported_context_token);
if (err)
return err;
/* ctx->state */
err = gssx_dec_buffer(xdr, &ctx->state);
if (err)
return err;
/* ctx->need_release */
err = gssx_dec_bool(xdr, &ctx->need_release);
if (err)
return err;
/* ctx->mech */
err = gssx_dec_buffer(xdr, &ctx->mech);
if (err)
return err;
/* ctx->src_name */
err = gssx_dec_name(xdr, &ctx->src_name);
if (err)
return err;
/* ctx->targ_name */
err = gssx_dec_name(xdr, &ctx->targ_name);
if (err)
return err;
/* ctx->lifetime */
p = xdr_inline_decode(xdr, 8+8);
if (unlikely(p == NULL))
return -ENOSPC;
p = xdr_decode_hyper(p, &ctx->lifetime);
/* ctx->ctx_flags */
p = xdr_decode_hyper(p, &ctx->ctx_flags);
/* ctx->locally_initiated */
err = gssx_dec_bool(xdr, &ctx->locally_initiated);
if (err)
return err;
/* ctx->open */
err = gssx_dec_bool(xdr, &ctx->open);
if (err)
return err;
/* we assume we have no options for now, so simply consume them */
/* ctx->options */
err = dummy_dec_opt_array(xdr, &ctx->options);
return err;
}
static int gssx_dec_name(struct xdr_stream *xdr,
struct gssx_name *name)
{
struct xdr_netobj dummy_netobj = { .len = 0 };
struct gssx_name_attr_array dummy_name_attr_array = { .count = 0 };
struct gssx_option_array dummy_option_array = { .count = 0 };
int err;
/* name->display_name */
err = gssx_dec_buffer(xdr, &name->display_name);
if (err)
return err;
/* name->name_type */
err = gssx_dec_buffer(xdr, &dummy_netobj);
if (err)
return err;
/* name->exported_name */
err = gssx_dec_buffer(xdr, &dummy_netobj);
if (err)
return err;
/* name->exported_composite_name */
err = gssx_dec_buffer(xdr, &dummy_netobj);
if (err)
return err;
/* we assume we have no attributes for now, so simply consume them */
/* name->name_attributes */
err = dummy_dec_nameattr_array(xdr, &dummy_name_attr_array);
if (err)
return err;
/* we assume we have no options for now, so simply consume them */
/* name->extensions */
err = dummy_dec_opt_array(xdr, &dummy_option_array);
return err;
}
static int dummy_enc_credel_array(struct xdr_stream *xdr,
struct gssx_cred_element_array *cea)
{
__be32 *p;
if (cea->count != 0)
return -EINVAL;
p = xdr_reserve_space(xdr, 4);
if (!p)
return -ENOSPC;
*p = 0;
return 0;
}
static int gssx_enc_cred(struct xdr_stream *xdr,
struct gssx_cred *cred)
{
int err;
/* cred->desired_name */
err = gssx_enc_name(xdr, &cred->desired_name);
if (err)
return err;
/* cred->elements */
err = dummy_enc_credel_array(xdr, &cred->elements);
if (err)
return err;
/* cred->cred_handle_reference */
err = gssx_enc_buffer(xdr, &cred->cred_handle_reference);
if (err)
return err;
/* cred->needs_release */
err = gssx_enc_bool(xdr, cred->needs_release);
return err;
}
static int gssx_enc_ctx(struct xdr_stream *xdr,
struct gssx_ctx *ctx)
{
__be32 *p;
int err;
/* ctx->exported_context_token */
err = gssx_enc_buffer(xdr, &ctx->exported_context_token);
if (err)
return err;
/* ctx->state */
err = gssx_enc_buffer(xdr, &ctx->state);
if (err)
return err;
/* ctx->need_release */
err = gssx_enc_bool(xdr, ctx->need_release);
if (err)
return err;
/* ctx->mech */
err = gssx_enc_buffer(xdr, &ctx->mech);
if (err)
return err;
/* ctx->src_name */
err = gssx_enc_name(xdr, &ctx->src_name);
if (err)
return err;
/* ctx->targ_name */
err = gssx_enc_name(xdr, &ctx->targ_name);
if (err)
return err;
/* ctx->lifetime */
p = xdr_reserve_space(xdr, 8+8);
if (!p)
return -ENOSPC;
p = xdr_encode_hyper(p, ctx->lifetime);
/* ctx->ctx_flags */
p = xdr_encode_hyper(p, ctx->ctx_flags);
/* ctx->locally_initiated */
err = gssx_enc_bool(xdr, ctx->locally_initiated);
if (err)
return err;
/* ctx->open */
err = gssx_enc_bool(xdr, ctx->open);
if (err)
return err;
/* leave options empty for now, will add once we have any options
* to pass up at all */
/* ctx->options */
err = dummy_enc_opt_array(xdr, &ctx->options);
return err;
}
static int gssx_dec_option_array(struct xdr_stream *xdr,
struct gssx_option_array *oa)
{
struct svc_cred *creds;
u32 count, i;
__be32 *p;
int err;
p = xdr_inline_decode(xdr, 4);
if (unlikely(p == NULL))
return -ENOSPC;
count = be32_to_cpup(p++);
if (!count)
return 0;
/* we recognize only 1 currently: CREDS_VALUE */
oa->count = 1;
oa->data = kmalloc(sizeof(struct gssx_option), GFP_KERNEL);
if (!oa->data)
return -ENOMEM;
creds = kzalloc(sizeof(struct svc_cred), GFP_KERNEL);
if (!creds) {
kfree(oa->data);
return -ENOMEM;
}
oa->data[0].option.data = CREDS_VALUE;
oa->data[0].option.len = sizeof(CREDS_VALUE);
oa->data[0].value.data = (void *)creds;
oa->data[0].value.len = 0;
for (i = 0; i < count; i++) {
gssx_buffer dummy = { 0, NULL };
u32 length;
/* option buffer */
p = xdr_inline_decode(xdr, 4);
if (unlikely(p == NULL))
return -ENOSPC;
length = be32_to_cpup(p);
p = xdr_inline_decode(xdr, length);
if (unlikely(p == NULL))
return -ENOSPC;
if (length == sizeof(CREDS_VALUE) &&
memcmp(p, CREDS_VALUE, sizeof(CREDS_VALUE)) == 0) {
/* We have creds here. parse them */
err = gssx_dec_linux_creds(xdr, creds);
if (err)
return err;
oa->data[0].value.len = 1; /* presence */
} else {
/* consume uninteresting buffer */
err = gssx_dec_buffer(xdr, &dummy);
if (err)
return err;
}
}
return 0;
}
