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SUNRPC: Use xdr_stream to encode Reply verifier in svcauth_tls_accept()

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Done as part of hardening the server-side RPC header encoding path.

Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever 2023-01-08 11:30:09 -05:00
parent 3b03f3c5d4
commit df18f9ccb9
1 changed files with 13 additions and 9 deletions
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22
net/sunrpc/svcauth_unix.c
View file

@ -822,9 +822,9 @@ svcauth_tls_accept(struct svc_rqst *rqstp)
{
struct xdr_stream *xdr = &rqstp->rq_arg_stream;
struct svc_cred *cred = &rqstp->rq_cred;
struct kvec *resv = rqstp->rq_res.head;
u32 flavor, len;
void *body;
__be32 *p;
/* Length of Call's credential body field: */
if (xdr_stream_decode_u32(xdr, &len) < 0)
@ -855,17 +855,21 @@ svcauth_tls_accept(struct svc_rqst *rqstp)
if (cred->cr_group_info == NULL)
return SVC_CLOSE;
/* Reply's verifier */
svc_putnl(resv, RPC_AUTH_NULL);
svcxdr_init_encode(rqstp);
if (rqstp->rq_xprt->xpt_ops->xpo_start_tls) {
svc_putnl(resv, 8);
memcpy(resv->iov_base + resv->iov_len, "STARTTLS", 8);
resv->iov_len += 8;
} else
svc_putnl(resv, 0);
p = xdr_reserve_space(&rqstp->rq_res_stream, XDR_UNIT * 2 + 8);
if (!p)
return SVC_CLOSE;
*p++ = rpc_auth_null;
*p++ = cpu_to_be32(8);
memcpy(p, "STARTTLS", 8);
} else {
if (xdr_stream_encode_opaque_auth(&rqstp->rq_res_stream,
RPC_AUTH_NULL, NULL, 0) < 0)
return SVC_CLOSE;
}
rqstp->rq_cred.cr_flavor = RPC_AUTH_TLS;
svcxdr_init_encode(rqstp);
return SVC_OK;
}