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SUNRPC: Use new helpers to handle TLS Alerts

Browse source 
Use the helpers to parse the level and description fields in
incoming alerts. "Warning" alerts are discarded, and "fatal"
alerts mean the session is no longer valid.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Link: https://lore.kernel.org/r/169047944747.5241.1974889594004407123.stgit@oracle-102.nfsv4bat.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Chuck Lever 2023-07-27 13:37:37 -04:00 • committed by Jakub Kicinski
parent 39d0e38dcc
commit 39067dda1d
2 changed files with 46 additions and 39 deletions
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45
net/sunrpc/svcsock.c
View file

@ -43,7 +43,6 @@
#include <net/udp.h>
#include <net/tcp.h>
#include <net/tcp_states.h>
#include <net/tls.h>
#include <net/tls_prot.h>
#include <net/handshake.h>
#include <linux/uaccess.h>
@ -227,27 +226,30 @@ static int svc_one_sock_name(struct svc_sock *svsk, char *buf, int remaining)
}
static int
svc_tcp_sock_process_cmsg(struct svc_sock *svsk, struct msghdr *msg,
svc_tcp_sock_process_cmsg(struct socket *sock, struct msghdr *msg,
struct cmsghdr *cmsg, int ret)
{
if (cmsg->cmsg_level == SOL_TLS &&
cmsg->cmsg_type == TLS_GET_RECORD_TYPE) {
u8 content_type = *((u8 *)CMSG_DATA(cmsg));
u8 content_type = tls_get_record_type(sock->sk, cmsg);
u8 level, description;
switch (content_type) {
case TLS_RECORD_TYPE_DATA:
/* TLS sets EOR at the end of each application data
* record, even though there might be more frames
* waiting to be decrypted.
*/
msg->msg_flags &= ~MSG_EOR;
break;
case TLS_RECORD_TYPE_ALERT:
ret = -ENOTCONN;
break;
default:
ret = -EAGAIN;
}
switch (content_type) {
case 0:
break;
case TLS_RECORD_TYPE_DATA:
/* TLS sets EOR at the end of each application data
* record, even though there might be more frames
* waiting to be decrypted.
*/
msg->msg_flags &= ~MSG_EOR;
break;
case TLS_RECORD_TYPE_ALERT:
tls_alert_recv(sock->sk, msg, &level, &description);
ret = (level == TLS_ALERT_LEVEL_FATAL) ?
-ENOTCONN : -EAGAIN;
break;
default:
/* discard this record type */
ret = -EAGAIN;
}
return ret;
}
@ -259,13 +261,14 @@ svc_tcp_sock_recv_cmsg(struct svc_sock *svsk, struct msghdr *msg)
struct cmsghdr cmsg;
u8 buf[CMSG_SPACE(sizeof(u8))];
} u;
struct socket *sock = svsk->sk_sock;
int ret;
msg->msg_control = &u;
msg->msg_controllen = sizeof(u);
ret = sock_recvmsg(svsk->sk_sock, msg, MSG_DONTWAIT);
ret = sock_recvmsg(sock, msg, MSG_DONTWAIT);
if (unlikely(msg->msg_controllen != sizeof(u)))
ret = svc_tcp_sock_process_cmsg(svsk, msg, &u.cmsg, ret);
ret = svc_tcp_sock_process_cmsg(sock, msg, &u.cmsg, ret);
return ret;
}

40
net/sunrpc/xprtsock.c
View file

@ -47,7 +47,6 @@
#include <net/checksum.h>
#include <net/udp.h>
#include <net/tcp.h>
#include <net/tls.h>
#include <net/tls_prot.h>
#include <net/handshake.h>
@ -361,24 +360,27 @@ static int
xs_sock_process_cmsg(struct socket *sock, struct msghdr *msg,
struct cmsghdr *cmsg, int ret)
{
if (cmsg->cmsg_level == SOL_TLS &&
cmsg->cmsg_type == TLS_GET_RECORD_TYPE) {
u8 content_type = *((u8 *)CMSG_DATA(cmsg));
u8 content_type = tls_get_record_type(sock->sk, cmsg);
u8 level, description;
switch (content_type) {
case TLS_RECORD_TYPE_DATA:
/* TLS sets EOR at the end of each application data
* record, even though there might be more frames
* waiting to be decrypted.
*/
msg->msg_flags &= ~MSG_EOR;
break;
case TLS_RECORD_TYPE_ALERT:
ret = -ENOTCONN;
break;
default:
ret = -EAGAIN;
}
switch (content_type) {
case 0:
break;
case TLS_RECORD_TYPE_DATA:
/* TLS sets EOR at the end of each application data
* record, even though there might be more frames
* waiting to be decrypted.
*/
msg->msg_flags &= ~MSG_EOR;
break;
case TLS_RECORD_TYPE_ALERT:
tls_alert_recv(sock->sk, msg, &level, &description);
ret = (level == TLS_ALERT_LEVEL_FATAL) ?
-EACCES : -EAGAIN;
break;
default:
/* discard this record type */
ret = -EAGAIN;
}
return ret;
}
@ -778,6 +780,8 @@ static void xs_stream_data_receive(struct sock_xprt *transport)
}
if (ret == -ESHUTDOWN)
kernel_sock_shutdown(transport->sock, SHUT_RDWR);
else if (ret == -EACCES)
xprt_wake_pending_tasks(&transport->xprt, -EACCES);
else
xs_poll_check_readable(transport);
out: