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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2021, 2022 Oracle. All rights reserved.
*
* The AUTH_TLS credential is used only to probe a remote peer
* for RPC-over-TLS support.
*/
#include <linux/types.h>
#include <linux/module.h>
#include <linux/sunrpc/clnt.h>
static const char *starttls_token = "STARTTLS";
static const size_t starttls_len = 8;
static struct rpc_auth tls_auth;
static struct rpc_cred tls_cred;
static void tls_encode_probe(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
const void *obj)
{
}
static int tls_decode_probe(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
void *obj)
{
return 0;
}
static const struct rpc_procinfo rpcproc_tls_probe = {
.p_encode = tls_encode_probe,
.p_decode = tls_decode_probe,
};
static void rpc_tls_probe_call_prepare(struct rpc_task *task, void *data)
{
task->tk_flags &= ~RPC_TASK_NO_RETRANS_TIMEOUT;
rpc_call_start(task);
}
static void rpc_tls_probe_call_done(struct rpc_task *task, void *data)
{
}
static const struct rpc_call_ops rpc_tls_probe_ops = {
.rpc_call_prepare = rpc_tls_probe_call_prepare,
.rpc_call_done = rpc_tls_probe_call_done,
};
static int tls_probe(struct rpc_clnt *clnt)
{
struct rpc_message msg = {
.rpc_proc = &rpcproc_tls_probe,
};
struct rpc_task_setup task_setup_data = {
.rpc_client = clnt,
.rpc_message = &msg,
.rpc_op_cred = &tls_cred,
.callback_ops = &rpc_tls_probe_ops,
.flags = RPC_TASK_SOFT | RPC_TASK_SOFTCONN,
};
struct rpc_task *task;
int status;
task = rpc_run_task(&task_setup_data);
if (IS_ERR(task))
return PTR_ERR(task);
status = task->tk_status;
rpc_put_task(task);
return status;
}
static struct rpc_auth *tls_create(const struct rpc_auth_create_args *args,
struct rpc_clnt *clnt)
{
refcount_inc(&tls_auth.au_count);
return &tls_auth;
}
static void tls_destroy(struct rpc_auth *auth)
{
}
static struct rpc_cred *tls_lookup_cred(struct rpc_auth *auth,
struct auth_cred *acred, int flags)
{
return get_rpccred(&tls_cred);
}
static void tls_destroy_cred(struct rpc_cred *cred)
{
}
static int tls_match(struct auth_cred *acred, struct rpc_cred *cred, int taskflags)
{
return 1;
}
static int tls_marshal(struct rpc_task *task, struct xdr_stream *xdr)
{
__be32 *p;
p = xdr_reserve_space(xdr, 4 * XDR_UNIT);
if (!p)
return -EMSGSIZE;
/* Credential */
*p++ = rpc_auth_tls;
*p++ = xdr_zero;
/* Verifier */
*p++ = rpc_auth_null;
*p = xdr_zero;
return 0;
}
static int tls_refresh(struct rpc_task *task)
{
set_bit(RPCAUTH_CRED_UPTODATE, &task->tk_rqstp->rq_cred->cr_flags);
return 0;
}
static int tls_validate(struct rpc_task *task, struct xdr_stream *xdr)
{
__be32 *p;
void *str;
p = xdr_inline_decode(xdr, XDR_UNIT);
if (!p)
return -EIO;
if (*p != rpc_auth_null)
return -EIO;
if (xdr_stream_decode_opaque_inline(xdr, &str, starttls_len) != starttls_len)
return -EIO;
if (memcmp(str, starttls_token, starttls_len))
return -EIO;
return 0;
}
const struct rpc_authops authtls_ops = {
.owner = THIS_MODULE,
.au_flavor = RPC_AUTH_TLS,
.au_name = "NULL",
.create = tls_create,
.destroy = tls_destroy,
.lookup_cred = tls_lookup_cred,
.ping = tls_probe,
};
static struct rpc_auth tls_auth = {
.au_cslack = NUL_CALLSLACK,
.au_rslack = NUL_REPLYSLACK,
.au_verfsize = NUL_REPLYSLACK,
.au_ralign = NUL_REPLYSLACK,
.au_ops = &authtls_ops,
.au_flavor = RPC_AUTH_TLS,
.au_count = REFCOUNT_INIT(1),
};
static const struct rpc_credops tls_credops = {
.cr_name = "AUTH_TLS",
.crdestroy = tls_destroy_cred,
.crmatch = tls_match,
.crmarshal = tls_marshal,
.crwrap_req = rpcauth_wrap_req_encode,
.crrefresh = tls_refresh,
.crvalidate = tls_validate,
.crunwrap_resp = rpcauth_unwrap_resp_decode,
};
static struct rpc_cred tls_cred = {
.cr_lru = LIST_HEAD_INIT(tls_cred.cr_lru),
.cr_auth = &tls_auth,
.cr_ops = &tls_credops,
.cr_count = REFCOUNT_INIT(2),
.cr_flags = 1UL << RPCAUTH_CRED_UPTODATE,
};
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