[PATCH nfs-utils] exportfs: make "insecure" the default for all exports

[Jeff Layton <jlayton@kernel.org>]

Back in the 80's someone thought it was a good idea to carve out a set
of ports that only privileged users could use. When NFS was originally
conceived, Sun made its server require that clients use low ports.
Since Linux was following suit with Sun in those days, exportfs has
always defaulted to requiring connections from low ports.

These days, anyone can be root on their laptop, so limiting connections
to low source ports is of little value.

Make the default be "insecure" when creating exports.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
In discussion at the Bake-a-thon, we decided to just go for making
"insecure" the default for all exports.
---
 support/nfs/exports.c      | 7 +++++--
 utils/exportfs/exports.man | 4 ++--
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/support/nfs/exports.c b/support/nfs/exports.c
index 21ec6486ba3d3945df0800972ba1dfd03bd65375..69f8ca8b5e2ed50b837ef287ca0685af3e70ed0b 100644
--- a/support/nfs/exports.c
+++ b/support/nfs/exports.c
@@ -34,8 +34,11 @@
 #include "reexport.h"
 #include "nfsd_path.h"
 
-#define EXPORT_DEFAULT_FLAGS	\
-  (NFSEXP_READONLY|NFSEXP_ROOTSQUASH|NFSEXP_GATHERED_WRITES|NFSEXP_NOSUBTREECHECK)
+#define EXPORT_DEFAULT_FLAGS	(NFSEXP_READONLY |	\
+				 NFSEXP_ROOTSQUASH |	\
+				 NFSEXP_GATHERED_WRITES |\
+				 NFSEXP_NOSUBTREECHECK | \
+				 NFSEXP_INSECURE_PORT)
 
 struct flav_info flav_map[] = {
 	{ "krb5",	RPC_AUTH_GSS_KRB5,	1},
diff --git a/utils/exportfs/exports.man b/utils/exportfs/exports.man
index 39dc30fb8290213990ca7a14b1b3971140b0d120..0b62bb3a82b0e74bc2a7eb84301c4ec97b14d003 100644
--- a/utils/exportfs/exports.man
+++ b/utils/exportfs/exports.man
@@ -180,8 +180,8 @@ understands the following export options:
 .TP
 .IR secure
 This option requires that requests not using gss originate on an
-Internet port less than IPPORT_RESERVED (1024). This option is on by default.
-To turn it off, specify
+Internet port less than IPPORT_RESERVED (1024). This option is off by default
+but can be explicitly disabled by specifying
 .IR insecure .
 (NOTE: older kernels (before upstream kernel version 4.17) enforced this
 requirement on gss requests as well.)

---
base-commit: 2cf015ea4312f37598efe9733fef3232ab67f784
change-id: 20250513-master-89974087bb04

Best regards,
-- 
Jeff Layton <jlayton@kernel.org>