ZFS allow send:encrypted

A new `zfs allow` permissions that ONLY allows sending replication
streams in raw (encrypted) mode, so encrypted data will not be
decrypted as part of the replication process.

Sponsored-by: Klara, Inc.
Sponsored-by: Karakun AG
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com>
Co-authored-by: JT Pennington <jt.pennington@klarasystems.com>
Signed-off-by: Allan Jude <allan@klarasystems.com>
Closes #17543

cmd/zfs/zfs_main.c

@@ -5303,6 +5303,7 @@ zfs_do_receive(int argc, char **argv)
 #define	ZFS_DELEG_PERM_MOUNT		"mount"
 #define	ZFS_DELEG_PERM_SHARE		"share"
 #define	ZFS_DELEG_PERM_SEND		"send"
+#define	ZFS_DELEG_PERM_SEND_RAW		"send:raw"
 #define	ZFS_DELEG_PERM_RECEIVE		"receive"
 #define	ZFS_DELEG_PERM_RECEIVE_APPEND	"receive:append"
 #define	ZFS_DELEG_PERM_ALLOW		"allow"
@@ -5345,6 +5346,7 @@ static zfs_deleg_perm_tab_t zfs_deleg_perm_tbl[] = {
 	{ ZFS_DELEG_PERM_RENAME, ZFS_DELEG_NOTE_RENAME },
 	{ ZFS_DELEG_PERM_ROLLBACK, ZFS_DELEG_NOTE_ROLLBACK },
 	{ ZFS_DELEG_PERM_SEND, ZFS_DELEG_NOTE_SEND },
+	{ ZFS_DELEG_PERM_SEND_RAW, ZFS_DELEG_NOTE_SEND_RAW },
 	{ ZFS_DELEG_PERM_SHARE, ZFS_DELEG_NOTE_SHARE },
 	{ ZFS_DELEG_PERM_SNAPSHOT, ZFS_DELEG_NOTE_SNAPSHOT },
 	{ ZFS_DELEG_PERM_BOOKMARK, ZFS_DELEG_NOTE_BOOKMARK },
@@ -5929,6 +5931,10 @@ deleg_perm_comment(zfs_deleg_note_t note)
 	case ZFS_DELEG_NOTE_SEND:
 		str = gettext("");
 		break;
+	case ZFS_DELEG_NOTE_SEND_RAW:
+		str = gettext("Allow sending ONLY encrypted (raw) replication"
+		    "\n\t\t\t\tstreams");
+		break;
 	case ZFS_DELEG_NOTE_SHARE:
 		str = gettext("Allows sharing file systems over NFS or SMB"
 		    "\n\t\t\t\tprotocols");

include/sys/dsl_deleg.h

@@ -46,6 +46,7 @@ extern "C" {
 #define	ZFS_DELEG_PERM_MOUNT		"mount"
 #define	ZFS_DELEG_PERM_SHARE		"share"
 #define	ZFS_DELEG_PERM_SEND		"send"
+#define	ZFS_DELEG_PERM_SEND_RAW		"send:raw"
 #define	ZFS_DELEG_PERM_RECEIVE		"receive"
 #define	ZFS_DELEG_PERM_RECEIVE_APPEND	"receive:append"
 #define	ZFS_DELEG_PERM_ALLOW		"allow"

include/zfs_deleg.h

@@ -55,6 +55,7 @@ typedef enum {
 	ZFS_DELEG_NOTE_PROMOTE,
 	ZFS_DELEG_NOTE_RENAME,
 	ZFS_DELEG_NOTE_SEND,
+	ZFS_DELEG_NOTE_SEND_RAW,
 	ZFS_DELEG_NOTE_RECEIVE,
 	ZFS_DELEG_NOTE_ALLOW,
 	ZFS_DELEG_NOTE_USERPROP,

man/man8/zfs-allow.8

@@ -30,7 +30,7 @@
 .\" Copyright 2018 Nexenta Systems, Inc.
 .\" Copyright 2019 Joyent, Inc.
 .\"
-.Dd March 13, 2025
+.Dd September 8, 2025
 .Dt ZFS-ALLOW 8
 .Os
 .
@@ -212,7 +212,8 @@ receive	subcommand	Must also have the \fBmount\fR and \fBcreate\fR ability, requ
 release	subcommand	Allows releasing a user hold which might destroy the snapshot
 rename	subcommand	Must also have the \fBmount\fR and \fBcreate\fR ability in the new parent
 rollback	subcommand	Must also have the \fBmount\fR ability
-send	subcommand
+send	subcommand	Allows sending a replication stream of a dataset.
+send:raw	subcommand	Only allows sending raw replication streams, preventing encrypted datasets being sent in decrypted form.
 share	subcommand	Allows sharing file systems over NFS or SMB protocols
 snapshot	subcommand	Must also have the \fBmount\fR ability
 

module/zcommon/zfs_deleg.c

@@ -59,6 +59,7 @@ const zfs_deleg_perm_tab_t zfs_deleg_perm_tab[] = {
 	{ZFS_DELEG_PERM_SNAPSHOT},
 	{ZFS_DELEG_PERM_SHARE},
 	{ZFS_DELEG_PERM_SEND},
+	{ZFS_DELEG_PERM_SEND_RAW},
 	{ZFS_DELEG_PERM_USERPROP},
 	{ZFS_DELEG_PERM_USERQUOTA},
 	{ZFS_DELEG_PERM_GROUPQUOTA},

module/zfs/zfs_ioctl.c

@@ -683,6 +683,7 @@ zfs_secpolicy_send(zfs_cmd_t *zc, nvlist_t *innvl, cred_t *cr)
 	dsl_dataset_t *ds;
 	const char *cp;
 	int error;
+	boolean_t rawok = (zc->zc_flags & 0x8);
 
 	/*
 	 * Generate the current snapshot name from the given objsetid, then
@@ -705,6 +706,10 @@ zfs_secpolicy_send(zfs_cmd_t *zc, nvlist_t *innvl, cred_t *cr)
 
 	error = zfs_secpolicy_write_perms_ds(zc->zc_name, ds,
 	    ZFS_DELEG_PERM_SEND, cr);
+	if (error != 0 && rawok == B_TRUE) {
+		error = zfs_secpolicy_write_perms_ds(zc->zc_name, ds,
+		    ZFS_DELEG_PERM_SEND_RAW, cr);
+	}
 	dsl_dataset_rele(ds, FTAG);
 	dsl_pool_rele(dp, FTAG);
 
@@ -714,9 +719,17 @@ zfs_secpolicy_send(zfs_cmd_t *zc, nvlist_t *innvl, cred_t *cr)
 static int
 zfs_secpolicy_send_new(zfs_cmd_t *zc, nvlist_t *innvl, cred_t *cr)
 {
+	boolean_t rawok = nvlist_exists(innvl, "rawok");
+	int error;
+
 	(void) innvl;
-	return (zfs_secpolicy_write_perms(zc->zc_name,
+	error = zfs_secpolicy_write_perms(zc->zc_name,
-	    ZFS_DELEG_PERM_SEND, cr));
+	    ZFS_DELEG_PERM_SEND, cr);
+	if (error != 0 && rawok == B_TRUE) {
+		error = zfs_secpolicy_write_perms(zc->zc_name,
+		    ZFS_DELEG_PERM_SEND_RAW, cr);
+	}
+	return (error);
 }
 
 static int