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SUNRPC: Support TLS handshake in the server-side TCP socket code

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This patch adds opportunitistic RPC-with-TLS to the Linux in-kernel
NFS server. If the client requests RPC-with-TLS and the user space
handshake agent is running, the server will set up a TLS session.

There are no policy settings yet. For example, the server cannot
yet require the use of RPC-with-TLS to access its data.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever 2023-04-20 13:56:24 -04:00
parent 22b620ec0b
commit b3cbf98e2f
6 changed files with 132 additions and 8 deletions
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5
include/linux/sunrpc/svc_xprt.h
View File

@ -27,7 +27,7 @@ struct svc_xprt_ops {
void (*xpo_detach)(struct svc_xprt *);
void (*xpo_free)(struct svc_xprt *);
void (*xpo_kill_temp_xprt)(struct svc_xprt *);
void (*xpo_start_tls)(struct svc_xprt *);
void (*xpo_handshake)(struct svc_xprt *xprt);
};
struct svc_xprt_class {
@ -70,6 +70,9 @@ struct svc_xprt {
#define XPT_LOCAL 12 /* connection from loopback interface */
#define XPT_KILL_TEMP 13 /* call xpo_kill_temp_xprt before closing */
#define XPT_CONG_CTRL 14 /* has congestion control */
#define XPT_HANDSHAKE 15 /* xprt requests a handshake */
#define XPT_TLS_SESSION 16 /* transport-layer security established */
#define XPT_PEER_AUTH 17 /* peer has been authenticated */
struct svc_serv *xpt_server; /* service for transport */
atomic_t xpt_reserved; /* space on outq that is rsvd */

2
include/linux/sunrpc/svcsock.h
View File

@ -38,6 +38,8 @@ struct svc_sock {
/* Number of queued send requests */
atomic_t sk_sendqlen;
struct completion sk_handshake_done;
struct page * sk_pages[RPCSVC_MAXPAGES]; /* received data */
};

16
include/trace/events/sunrpc.h
View File

@ -1857,7 +1857,10 @@ TRACE_EVENT(svc_stats_latency,
{ BIT(XPT_CACHE_AUTH), "CACHE_AUTH" }, \
{ BIT(XPT_LOCAL), "LOCAL" }, \
{ BIT(XPT_KILL_TEMP), "KILL_TEMP" }, \
{ BIT(XPT_CONG_CTRL), "CONG_CTRL" })
{ BIT(XPT_CONG_CTRL), "CONG_CTRL" }, \
{ BIT(XPT_HANDSHAKE), "HANDSHAKE" }, \
{ BIT(XPT_TLS_SESSION), "TLS_SESSION" }, \
{ BIT(XPT_PEER_AUTH), "PEER_AUTH" })
TRACE_EVENT(svc_xprt_create_err,
TP_PROTO(
@ -1990,6 +1993,17 @@ DEFINE_SVC_XPRT_EVENT(close);
DEFINE_SVC_XPRT_EVENT(detach);
DEFINE_SVC_XPRT_EVENT(free);
#define DEFINE_SVC_TLS_EVENT(name) \
DEFINE_EVENT(svc_xprt_event, svc_tls_##name, \
TP_PROTO(const struct svc_xprt *xprt), \
TP_ARGS(xprt))
DEFINE_SVC_TLS_EVENT(start);
DEFINE_SVC_TLS_EVENT(upcall);
DEFINE_SVC_TLS_EVENT(unavailable);
DEFINE_SVC_TLS_EVENT(not_started);
DEFINE_SVC_TLS_EVENT(timed_out);
TRACE_EVENT(svc_xprt_accept,
TP_PROTO(
const struct svc_xprt *xprt,

5
net/sunrpc/svc_xprt.c
View File

@ -427,7 +427,7 @@ static bool svc_xprt_ready(struct svc_xprt *xprt)
if (xpt_flags & BIT(XPT_BUSY))
return false;
if (xpt_flags & (BIT(XPT_CONN) | BIT(XPT_CLOSE)))
if (xpt_flags & (BIT(XPT_CONN) | BIT(XPT_CLOSE) | BIT(XPT_HANDSHAKE)))
return true;
if (xpt_flags & (BIT(XPT_DATA) | BIT(XPT_DEFERRED))) {
if (xprt->xpt_ops->xpo_has_wspace(xprt) &&
@ -828,6 +828,9 @@ static int svc_handle_xprt(struct svc_rqst *rqstp, struct svc_xprt *xprt)
module_put(xprt->xpt_class->xcl_owner);
}
svc_xprt_received(xprt);
} else if (test_bit(XPT_HANDSHAKE, &xprt->xpt_flags)) {
xprt->xpt_ops->xpo_handshake(xprt);
svc_xprt_received(xprt);
} else if (svc_xprt_reserve_slot(rqstp, xprt)) {
/* XPT_DATA|XPT_DEFERRED case: */
dprintk("svc: server %p, pool %u, transport %p, inuse=%d\n",

11
net/sunrpc/svcauth_unix.c
View File

@ -17,8 +17,9 @@
#include <net/ipv6.h>
#include <linux/kernel.h>
#include <linux/user_namespace.h>
#define RPCDBG_FACILITY RPCDBG_AUTH
#include <trace/events/sunrpc.h>
#define RPCDBG_FACILITY RPCDBG_AUTH
#include "netns.h"
@ -832,6 +833,7 @@ svcauth_tls_accept(struct svc_rqst *rqstp)
{
struct xdr_stream *xdr = &rqstp->rq_arg_stream;
struct svc_cred *cred = &rqstp->rq_cred;
struct svc_xprt *xprt = rqstp->rq_xprt;
u32 flavor, len;
void *body;
__be32 *p;
@ -865,14 +867,19 @@ svcauth_tls_accept(struct svc_rqst *rqstp)
if (cred->cr_group_info == NULL)
return SVC_CLOSE;
if (rqstp->rq_xprt->xpt_ops->xpo_start_tls) {
if (xprt->xpt_ops->xpo_handshake) {
p = xdr_reserve_space(&rqstp->rq_res_stream, XDR_UNIT * 2 + 8);
if (!p)
return SVC_CLOSE;
trace_svc_tls_start(xprt);
*p++ = rpc_auth_null;
*p++ = cpu_to_be32(8);
memcpy(p, "STARTTLS", 8);
set_bit(XPT_HANDSHAKE, &xprt->xpt_flags);
svc_xprt_enqueue(xprt);
} else {
trace_svc_tls_unavailable(xprt);
if (xdr_stream_encode_opaque_auth(&rqstp->rq_res_stream,
RPC_AUTH_NULL, NULL, 0) < 0)
return SVC_CLOSE;

101
net/sunrpc/svcsock.c
View File

@ -44,9 +44,11 @@
#include <net/tcp.h>
#include <net/tcp_states.h>
#include <net/tls.h>
#include <net/handshake.h>
#include <linux/uaccess.h>
#include <linux/highmem.h>
#include <asm/ioctls.h>
#include <linux/key.h>
#include <linux/sunrpc/types.h>
#include <linux/sunrpc/clnt.h>
@ -64,6 +66,12 @@
#define RPCDBG_FACILITY RPCDBG_SVCXPRT
/* To-do: to avoid tying up an nfsd thread while waiting for a
* handshake request, the request could instead be deferred.
*/
enum {
SVC_HANDSHAKE_TO = 5U * HZ
};
static struct svc_sock *svc_setup_socket(struct svc_serv *, struct socket *,
int flags);
@ -359,6 +367,8 @@ static void svc_data_ready(struct sock *sk)
rmb();
svsk->sk_odata(sk);
trace_svcsock_data_ready(&svsk->sk_xprt, 0);
if (test_bit(XPT_HANDSHAKE, &svsk->sk_xprt.xpt_flags))
return;
if (!test_and_set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags))
svc_xprt_enqueue(&svsk->sk_xprt);
}
@ -396,6 +406,88 @@ static void svc_tcp_kill_temp_xprt(struct svc_xprt *xprt)
sock_no_linger(svsk->sk_sock->sk);
}
/**
* svc_tcp_handshake_done - Handshake completion handler
* @data: address of xprt to wake
* @status: status of handshake
* @peerid: serial number of key containing the remote peer's identity
*
* If a security policy is specified as an export option, we don't
* have a specific export here to check. So we set a "TLS session
* is present" flag on the xprt and let an upper layer enforce local
* security policy.
*/
static void svc_tcp_handshake_done(void *data, int status, key_serial_t peerid)
{
struct svc_xprt *xprt = data;
struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
if (!status) {
if (peerid != TLS_NO_PEERID)
set_bit(XPT_PEER_AUTH, &xprt->xpt_flags);
set_bit(XPT_TLS_SESSION, &xprt->xpt_flags);
}
clear_bit(XPT_HANDSHAKE, &xprt->xpt_flags);
complete_all(&svsk->sk_handshake_done);
}
/**
* svc_tcp_handshake - Perform a transport-layer security handshake
* @xprt: connected transport endpoint
*
*/
static void svc_tcp_handshake(struct svc_xprt *xprt)
{
struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
struct sock *sk = svsk->sk_sock->sk;
struct tls_handshake_args args = {
.ta_sock = svsk->sk_sock,
.ta_done = svc_tcp_handshake_done,
.ta_data = xprt,
};
int ret;
trace_svc_tls_upcall(xprt);
clear_bit(XPT_TLS_SESSION, &xprt->xpt_flags);
init_completion(&svsk->sk_handshake_done);
ret = tls_server_hello_x509(&args, GFP_KERNEL);
if (ret) {
trace_svc_tls_not_started(xprt);
goto out_failed;
}
ret = wait_for_completion_interruptible_timeout(&svsk->sk_handshake_done,
SVC_HANDSHAKE_TO);
if (ret <= 0) {
if (tls_handshake_cancel(sk)) {
trace_svc_tls_timed_out(xprt);
goto out_close;
}
}
if (!test_bit(XPT_TLS_SESSION, &xprt->xpt_flags)) {
trace_svc_tls_unavailable(xprt);
goto out_close;
}
/* Mark the transport ready in case the remote sent RPC
* traffic before the kernel received the handshake
* completion downcall.
*/
set_bit(XPT_DATA, &xprt->xpt_flags);
svc_xprt_enqueue(xprt);
return;
out_close:
set_bit(XPT_CLOSE, &xprt->xpt_flags);
out_failed:
clear_bit(XPT_HANDSHAKE, &xprt->xpt_flags);
set_bit(XPT_DATA, &xprt->xpt_flags);
svc_xprt_enqueue(xprt);
}
/*
* See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo
*/
@ -1257,6 +1349,7 @@ static const struct svc_xprt_ops svc_tcp_ops = {
.xpo_has_wspace = svc_tcp_has_wspace,
.xpo_accept = svc_tcp_accept,
.xpo_kill_temp_xprt = svc_tcp_kill_temp_xprt,
.xpo_handshake = svc_tcp_handshake,
};
static struct svc_xprt_class svc_tcp_class = {
@ -1580,10 +1673,12 @@ static void svc_tcp_sock_detach(struct svc_xprt *xprt)
static void svc_sock_free(struct svc_xprt *xprt)
{
struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
struct socket *sock = svsk->sk_sock;
if (svsk->sk_sock->file)
sockfd_put(svsk->sk_sock);
tls_handshake_cancel(sock->sk);
if (sock->file)
sockfd_put(sock);
else
sock_release(svsk->sk_sock);
sock_release(sock);
kfree(svsk);
}