Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 243 insertions, 0 deletions

diff --git a/net/sunrpc/auth_unix.c b/net/sunrpc/auth_unix.c
new file mode 100644
index 000000000..1e091d3fa
--- /dev/null
+++ b/net/sunrpc/auth_unix.c
@@ -0,0 +1,243 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * linux/net/sunrpc/auth_unix.c
+ *
+ * UNIX-style authentication; no AUTH_SHORT support
+ *
+ * Copyright (C) 1996, Olaf Kirch <okir@monad.swb.de>
+ */
+
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/module.h>
+#include <linux/mempool.h>
+#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/auth.h>
+#include <linux/user_namespace.h>
+
+
+#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
+# define RPCDBG_FACILITY	RPCDBG_AUTH
+#endif
+
+static struct rpc_auth		unix_auth;
+static const struct rpc_credops	unix_credops;
+static mempool_t		*unix_pool;
+
+static struct rpc_auth *
+unx_create(const struct rpc_auth_create_args *args, struct rpc_clnt *clnt)
+{
+	refcount_inc(&unix_auth.au_count);
+	return &unix_auth;
+}
+
+static void
+unx_destroy(struct rpc_auth *auth)
+{
+}
+
+/*
+ * Lookup AUTH_UNIX creds for current process
+ */
+static struct rpc_cred *unx_lookup_cred(struct rpc_auth *auth,
+					struct auth_cred *acred, int flags)
+{
+	struct rpc_cred *ret;
+
+	ret = kmalloc(sizeof(*ret), rpc_task_gfp_mask());
+	if (!ret) {
+		if (!(flags & RPCAUTH_LOOKUP_ASYNC))
+			return ERR_PTR(-ENOMEM);
+		ret = mempool_alloc(unix_pool, GFP_NOWAIT);
+		if (!ret)
+			return ERR_PTR(-ENOMEM);
+	}
+	rpcauth_init_cred(ret, acred, auth, &unix_credops);
+	ret->cr_flags = 1UL << RPCAUTH_CRED_UPTODATE;
+	return ret;
+}
+
+static void
+unx_free_cred_callback(struct rcu_head *head)
+{
+	struct rpc_cred *rpc_cred = container_of(head, struct rpc_cred, cr_rcu);
+
+	put_cred(rpc_cred->cr_cred);
+	mempool_free(rpc_cred, unix_pool);
+}
+
+static void
+unx_destroy_cred(struct rpc_cred *cred)
+{
+	call_rcu(&cred->cr_rcu, unx_free_cred_callback);
+}
+
+/*
+ * Match credentials against current the auth_cred.
+ */
+static int
+unx_match(struct auth_cred *acred, struct rpc_cred *cred, int flags)
+{
+	unsigned int groups = 0;
+	unsigned int i;
+
+	if (cred->cr_cred == acred->cred)
+		return 1;
+
+	if (!uid_eq(cred->cr_cred->fsuid, acred->cred->fsuid) || !gid_eq(cred->cr_cred->fsgid, acred->cred->fsgid))
+		return 0;
+
+	if (acred->cred->group_info != NULL)
+		groups = acred->cred->group_info->ngroups;
+	if (groups > UNX_NGROUPS)
+		groups = UNX_NGROUPS;
+	if (cred->cr_cred->group_info == NULL)
+		return groups == 0;
+	if (groups != cred->cr_cred->group_info->ngroups)
+		return 0;
+
+	for (i = 0; i < groups ; i++)
+		if (!gid_eq(cred->cr_cred->group_info->gid[i], acred->cred->group_info->gid[i]))
+			return 0;
+	return 1;
+}
+
+/*
+ * Marshal credentials.
+ * Maybe we should keep a cached credential for performance reasons.
+ */
+static int
+unx_marshal(struct rpc_task *task, struct xdr_stream *xdr)
+{
+	struct rpc_clnt	*clnt = task->tk_client;
+	struct rpc_cred	*cred = task->tk_rqstp->rq_cred;
+	__be32		*p, *cred_len, *gidarr_len;
+	int		i;
+	struct group_info *gi = cred->cr_cred->group_info;
+	struct user_namespace *userns = clnt->cl_cred ?
+		clnt->cl_cred->user_ns : &init_user_ns;
+
+	/* Credential */
+
+	p = xdr_reserve_space(xdr, 3 * sizeof(*p));
+	if (!p)
+		goto marshal_failed;
+	*p++ = rpc_auth_unix;
+	cred_len = p++;
+	*p++ = xdr_zero;	/* stamp */
+	if (xdr_stream_encode_opaque(xdr, clnt->cl_nodename,
+				     clnt->cl_nodelen) < 0)
+		goto marshal_failed;
+	p = xdr_reserve_space(xdr, 3 * sizeof(*p));
+	if (!p)
+		goto marshal_failed;
+	*p++ = cpu_to_be32(from_kuid_munged(userns, cred->cr_cred->fsuid));
+	*p++ = cpu_to_be32(from_kgid_munged(userns, cred->cr_cred->fsgid));
+
+	gidarr_len = p++;
+	if (gi)
+		for (i = 0; i < UNX_NGROUPS && i < gi->ngroups; i++)
+			*p++ = cpu_to_be32(from_kgid_munged(userns, gi->gid[i]));
+	*gidarr_len = cpu_to_be32(p - gidarr_len - 1);
+	*cred_len = cpu_to_be32((p - cred_len - 1) << 2);
+	p = xdr_reserve_space(xdr, (p - gidarr_len - 1) << 2);
+	if (!p)
+		goto marshal_failed;
+
+	/* Verifier */
+
+	p = xdr_reserve_space(xdr, 2 * sizeof(*p));
+	if (!p)
+		goto marshal_failed;
+	*p++ = rpc_auth_null;
+	*p   = xdr_zero;
+
+	return 0;
+
+marshal_failed:
+	return -EMSGSIZE;
+}
+
+/*
+ * Refresh credentials. This is a no-op for AUTH_UNIX
+ */
+static int
+unx_refresh(struct rpc_task *task)
+{
+	set_bit(RPCAUTH_CRED_UPTODATE, &task->tk_rqstp->rq_cred->cr_flags);
+	return 0;
+}
+
+static int
+unx_validate(struct rpc_task *task, struct xdr_stream *xdr)
+{
+	struct rpc_auth *auth = task->tk_rqstp->rq_cred->cr_auth;
+	__be32 *p;
+	u32 size;
+
+	p = xdr_inline_decode(xdr, 2 * sizeof(*p));
+	if (!p)
+		return -EIO;
+	switch (*p++) {
+	case rpc_auth_null:
+	case rpc_auth_unix:
+	case rpc_auth_short:
+		break;
+	default:
+		return -EIO;
+	}
+	size = be32_to_cpup(p);
+	if (size > RPC_MAX_AUTH_SIZE)
+		return -EIO;
+	p = xdr_inline_decode(xdr, size);
+	if (!p)
+		return -EIO;
+
+	auth->au_verfsize = XDR_QUADLEN(size) + 2;
+	auth->au_rslack = XDR_QUADLEN(size) + 2;
+	auth->au_ralign = XDR_QUADLEN(size) + 2;
+	return 0;
+}
+
+int __init rpc_init_authunix(void)
+{
+	unix_pool = mempool_create_kmalloc_pool(16, sizeof(struct rpc_cred));
+	return unix_pool ? 0 : -ENOMEM;
+}
+
+void rpc_destroy_authunix(void)
+{
+	mempool_destroy(unix_pool);
+}
+
+const struct rpc_authops authunix_ops = {
+	.owner		= THIS_MODULE,
+	.au_flavor	= RPC_AUTH_UNIX,
+	.au_name	= "UNIX",
+	.create		= unx_create,
+	.destroy	= unx_destroy,
+	.lookup_cred	= unx_lookup_cred,
+};
+
+static
+struct rpc_auth		unix_auth = {
+	.au_cslack	= UNX_CALLSLACK,
+	.au_rslack	= NUL_REPLYSLACK,
+	.au_verfsize	= NUL_REPLYSLACK,
+	.au_ops		= &authunix_ops,
+	.au_flavor	= RPC_AUTH_UNIX,
+	.au_count	= REFCOUNT_INIT(1),
+};
+
+static
+const struct rpc_credops unix_credops = {
+	.cr_name	= "AUTH_UNIX",
+	.crdestroy	= unx_destroy_cred,
+	.crmatch	= unx_match,
+	.crmarshal	= unx_marshal,
+	.crwrap_req	= rpcauth_wrap_req_encode,
+	.crrefresh	= unx_refresh,
+	.crvalidate	= unx_validate,
+	.crunwrap_resp	= rpcauth_unwrap_resp_decode,
+};