libzfs: add keylocation=https://, backed by fetch(3) or libcurl

Add support for http and https to the keylocation properly to
allow encryption keys to be fetched from the specified URL.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Ryan Moeller <ryan@ixsystems.com>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Issue #9543
Closes #9947
Closes #11956

.github/workflows/zfs-tests-functional.yml

@@ -26,7 +26,8 @@ jobs:
           xfslibs-dev libattr1-dev libacl1-dev libudev-dev libdevmapper-dev \
           libssl-dev libffi-dev libaio-dev libelf-dev libmount-dev \
           libpam0g-dev pamtester python-dev python-setuptools python-cffi \
-          python3 python3-dev python3-setuptools python3-cffi python3-packaging
+          python3 python3-dev python3-setuptools python3-cffi python3-packaging \
+          libcurl4-openssl-dev
     - name: Autogen.sh
       run: |
         sh autogen.sh

.github/workflows/zfs-tests-sanity.yml

@@ -22,7 +22,8 @@ jobs:
           xfslibs-dev libattr1-dev libacl1-dev libudev-dev libdevmapper-dev \
           libssl-dev libffi-dev libaio-dev libelf-dev libmount-dev \
           libpam0g-dev pamtester python-dev python-setuptools python-cffi \
-          python3 python3-dev python3-setuptools python3-cffi python3-packaging
+          python3 python3-dev python3-setuptools python3-cffi python3-packaging \
+          libcurl4-openssl-dev
     - name: Autogen.sh
       run: |
         sh autogen.sh

config/Substfiles.am

@@ -15,7 +15,9 @@ subst_sed_cmd = \
 	-e 's|@PYTHON[@]|$(PYTHON)|g' \
 	-e 's|@PYTHON_SHEBANG[@]|$(PYTHON_SHEBANG)|g' \
 	-e 's|@DEFAULT_INIT_NFS_SERVER[@]|$(DEFAULT_INIT_NFS_SERVER)|g' \
-	-e 's|@DEFAULT_INIT_SHELL[@]|$(DEFAULT_INIT_SHELL)|g'
+	-e 's|@DEFAULT_INIT_SHELL[@]|$(DEFAULT_INIT_SHELL)|g' \
+	-e 's|@LIBFETCH_DYNAMIC[@]|$(LIBFETCH_DYNAMIC)|g' \
+	-e 's|@LIBFETCH_SONAME[@]|$(LIBFETCH_SONAME)|g'
 
 SUBSTFILES =
 CLEANFILES = $(SUBSTFILES)

config/user-libfetch.m4

@@ -0,0 +1,71 @@
+dnl #
+dnl # Check for a libfetch - either fetch(3) or libcurl.
+dnl #
+dnl # There are two configuration dimensions:
+dnl #   * fetch(3) vs libcurl
+dnl #   * static vs dynamic
+dnl #
+dnl # fetch(3) is only dynamic.
+dnl # We use sover 6, which first appeared in FreeBSD 8.0-RELEASE.
+dnl #
+dnl # libcurl development packages include curl-config(1) – we want:
+dnl #   * HTTPS support
+dnl #   * version at least 7.16 (October 2006), for sover 4
+dnl #   * to decide if it's static or not
+dnl #
+AC_DEFUN([ZFS_AC_CONFIG_USER_LIBFETCH], [
+	AC_MSG_CHECKING([for libfetch])
+	LIBFETCH_LIBS=
+	LIBFETCH_IS_FETCH=0
+	LIBFETCH_IS_LIBCURL=0
+	LIBFETCH_DYNAMIC=0
+	LIBFETCH_SONAME=
+	have_libfetch=
+
+	saved_libs="$LIBS"
+	LIBS="$LIBS -lfetch"
+	AC_LINK_IFELSE([AC_LANG_PROGRAM([[
+		#include <sys/param.h>
+		#include <stdio.h>
+		#include <fetch.h>
+	]], [fetchGetURL("", "");])], [
+		have_libfetch=1
+		LIBFETCH_IS_FETCH=1
+		LIBFETCH_DYNAMIC=1
+		LIBFETCH_SONAME='"libfetch.so.6"'
+		LIBFETCH_LIBS="-ldl"
+		AC_MSG_RESULT([fetch(3)])
+	], [])
+	LIBS="$saved_libs"
+
+	if test -z "$have_libfetch"; then
+		if curl-config --protocols 2>/dev/null | grep -q HTTPS &&
+		    test "$(printf "%u" "0x$(curl-config --vernum)")" -ge "$(printf "%u" "0x071000")"; then
+			have_libfetch=1
+			LIBFETCH_IS_LIBCURL=1
+			if test "$(curl-config --built-shared)" = "yes"; then
+				LIBFETCH_DYNAMIC=1
+				LIBFETCH_SONAME='"libcurl.so.4"'
+				LIBFETCH_LIBS="-ldl"
+				AC_MSG_RESULT([libcurl])
+			else
+				LIBFETCH_LIBS="$(curl-config --libs)"
+				AC_MSG_RESULT([libcurl (static)])
+			fi
+
+			CCFLAGS="$CCFLAGS $(curl-config --cflags)"
+		fi
+	fi
+
+	if test -z "$have_libfetch"; then
+		AC_MSG_RESULT([none])
+	fi
+
+	AC_SUBST([LIBFETCH_LIBS])
+	AC_SUBST([LIBFETCH_DYNAMIC])
+	AC_SUBST([LIBFETCH_SONAME])
+	AC_DEFINE_UNQUOTED([LIBFETCH_IS_FETCH], [$LIBFETCH_IS_FETCH], [libfetch is fetch(3)])
+	AC_DEFINE_UNQUOTED([LIBFETCH_IS_LIBCURL], [$LIBFETCH_IS_LIBCURL], [libfetch is libcurl])
+	AC_DEFINE_UNQUOTED([LIBFETCH_DYNAMIC], [$LIBFETCH_DYNAMIC], [whether the chosen libfetch is to be loaded at run-time])
+	AC_DEFINE_UNQUOTED([LIBFETCH_SONAME], [$LIBFETCH_SONAME], [soname of chosen libfetch])
+])

config/user.m4

@@ -22,6 +22,7 @@ AC_DEFUN([ZFS_AC_CONFIG_USER], [
 	ZFS_AC_CONFIG_USER_LIBCRYPTO
 	ZFS_AC_CONFIG_USER_LIBAIO
 	ZFS_AC_CONFIG_USER_LIBATOMIC
+	ZFS_AC_CONFIG_USER_LIBFETCH
 	ZFS_AC_CONFIG_USER_CLOCK_GETTIME
 	ZFS_AC_CONFIG_USER_PAM
 	ZFS_AC_CONFIG_USER_RUNSTATEDIR

contrib/dracut/90zfs/module-setup.sh.in

@@ -60,6 +60,11 @@ install() {
 		# Fallback: Guess the path and include all matches
 		dracut_install /usr/lib*/gcc/**/libgcc_s.so*
 	fi
+	if [ @LIBFETCH_DYNAMIC@ != 0 ]; then
+		for d in $libdirs; do
+			[ -e "$d"/@LIBFETCH_SONAME@ ] && dracut_install "$d"/@LIBFETCH_SONAME@
+		done
+	fi
 	dracut_install @mounthelperdir@/mount.zfs
 	dracut_install @udevdir@/vdev_id
 	dracut_install awk

contrib/dracut/90zfs/zfs-env-bootfs.service.in

@@ -8,7 +8,7 @@ Before=zfs-import.target
 
 [Service]
 Type=oneshot
-ExecStart=/bin/sh -c "systemctl set-environment BOOTFS=$(@sbindir@/zpool list -H -o bootfs | grep -m1 -v '^-$')"
+ExecStart=/bin/sh -c "exec systemctl set-environment BOOTFS=$(@sbindir@/zpool list -H -o bootfs | grep -m1 -v '^-$')"
 
 [Install]
 WantedBy=zfs-import.target

contrib/dracut/90zfs/zfs-load-key.sh.in

@@ -43,13 +43,14 @@ if [ "$(zpool list -H -o feature@encryption "${BOOTFS%%/*}")" = 'active' ]; then
 
         KEYLOCATION="$(zfs get -H -o value keylocation "${ENCRYPTIONROOT}")"
         if ! [ "${KEYLOCATION}" = "prompt" ]; then
+            if ! [ "${KEYLOCATION#http}" = "${KEYLOCATION}" ]; then
+                systemctl start network-online.target
+            fi
             zfs load-key "${ENCRYPTIONROOT}"
         else
             # decrypt them
-            TRY_COUNT=5
+            for _ in 1 2 3 4 5; do
-            while [ $TRY_COUNT -gt 0 ]; do
                 systemd-ask-password "Encrypted ZFS password for ${BOOTFS}" --no-tty | zfs load-key "${ENCRYPTIONROOT}" && break
-                TRY_COUNT=$((TRY_COUNT - 1))
             done
         fi
     fi

contrib/dracut/90zfs/zfs-rollback-bootfs.service.in

@@ -10,5 +10,5 @@ ConditionKernelCommandLine=bootfs.rollback
 # ${BOOTFS} should have been set by zfs-env-bootfs.service
 Type=oneshot
 ExecStartPre=/bin/sh -c 'test -n "${BOOTFS}"'
-ExecStart=/bin/sh -c '. /lib/dracut-lib.sh; SNAPNAME="$(getarg bootfs.rollback)"; @sbindir@/zfs rollback -Rf "${BOOTFS}@${SNAPNAME:-%v}"'
+ExecStart=/bin/sh -c '. /lib/dracut-lib.sh; SNAPNAME="$(getarg bootfs.rollback)"; exec @sbindir@/zfs rollback -Rf "${BOOTFS}@${SNAPNAME:-%v}"'
 RemainAfterExit=yes

contrib/dracut/90zfs/zfs-snapshot-bootfs.service.in

@@ -10,5 +10,5 @@ ConditionKernelCommandLine=bootfs.snapshot
 # ${BOOTFS} should have been set by zfs-env-bootfs.service
 Type=oneshot
 ExecStartPre=/bin/sh -c 'test -n "${BOOTFS}"'
-ExecStart=-/bin/sh -c '. /lib/dracut-lib.sh; SNAPNAME="$(getarg bootfs.snapshot)"; @sbindir@/zfs snapshot "${BOOTFS}@${SNAPNAME:-%v}"'
+ExecStart=-/bin/sh -c '. /lib/dracut-lib.sh; SNAPNAME="$(getarg bootfs.snapshot)"; exec @sbindir@/zfs snapshot "${BOOTFS}@${SNAPNAME:-%v}"'
 RemainAfterExit=yes

contrib/initramfs/hooks/zfs.in

@@ -30,6 +30,13 @@ find /lib/ -type f -name "libgcc_s.so.[1-9]" | while read -r libgcc; do
 	copy_exec "$libgcc"
 done
 
+# shellcheck disable=SC2050
+if [ @LIBFETCH_DYNAMIC@ != 0 ]; then
+	find /lib/ -name @LIBFETCH_SONAME@ | while read -r libfetch; do
+		copy_exec "$libfetch"
+	done
+fi
+
 copy_file config "/etc/hostid"
 copy_file cache  "@sysconfdir@/zfs/zpool.cache"
 copy_file config "@initconfdir@/zfs"

contrib/initramfs/scripts/zfs

@@ -403,28 +403,25 @@ decrypt_fs()
 			KEYSTATUS="$(get_fs_value "${ENCRYPTIONROOT}" keystatus)"
 			# Continue only if the key needs to be loaded
 			[ "$KEYSTATUS" = "unavailable" ] || return 0
-			TRY_COUNT=3
 
-			# If key is stored in a file, do not prompt
+			# Do not prompt if key is stored noninteractively,
 			if ! [ "${KEYLOCATION}" = "prompt" ]; then
 				$ZFS load-key "${ENCRYPTIONROOT}"
 
 			# Prompt with plymouth, if active
-			elif [ -e /bin/plymouth ] && /bin/plymouth --ping 2>/dev/null; then
+			elif /bin/plymouth --ping 2>/dev/null; then
 				echo "plymouth" > /run/zfs_console_askpwd_cmd
-				while [ $TRY_COUNT -gt 0 ]; do
+				for _ in 1 2 3; do
 					plymouth ask-for-password --prompt "Encrypted ZFS password for ${ENCRYPTIONROOT}" | \
 						$ZFS load-key "${ENCRYPTIONROOT}" && break
-					TRY_COUNT=$((TRY_COUNT - 1))
 				done
 
 			# Prompt with systemd, if active
 			elif [ -e /run/systemd/system ]; then
 				echo "systemd-ask-password" > /run/zfs_console_askpwd_cmd
-				while [ $TRY_COUNT -gt 0 ]; do
+				for _ in 1 2 3; do
 					systemd-ask-password "Encrypted ZFS password for ${ENCRYPTIONROOT}" --no-tty | \
 						$ZFS load-key "${ENCRYPTIONROOT}" && break
-					TRY_COUNT=$((TRY_COUNT - 1))
 				done
 
 			# Prompt with ZFS tty, otherwise

include/libzfs_impl.h

@@ -72,6 +72,8 @@ struct libzfs_handle {
 	boolean_t libzfs_prop_debug;
 	regex_t libzfs_urire;
 	uint64_t libzfs_max_nvlist;
+	void *libfetch;
+	char *libfetch_load_error;
 };
 
 struct zfs_handle {

lib/libzfs/Makefile.am

@@ -75,7 +75,7 @@ libzfs_la_LIBADD = \
 	$(abs_top_builddir)/lib/libnvpair/libnvpair.la \
 	$(abs_top_builddir)/lib/libuutil/libuutil.la
 
-libzfs_la_LIBADD += -lm $(LIBCRYPTO_LIBS) $(ZLIB_LIBS) $(LTLIBINTL)
+libzfs_la_LIBADD += -lm $(LIBCRYPTO_LIBS) $(ZLIB_LIBS) $(LIBFETCH_LIBS) $(LTLIBINTL)
 
 libzfs_la_LDFLAGS = -pthread
 

lib/libzfs/libzfs.abi

@@ -551,10 +551,6 @@
       <parameter type-id='e1c52942'/>
       <return type-id='95e97e5e'/>
     </function-decl>
-    <function-decl name='unlink' visibility='default' binding='global' size-in-bits='64'>
-      <parameter type-id='80f4b756'/>
-      <return type-id='95e97e5e'/>
-    </function-decl>
   </abi-instr>
   <abi-instr address-size='64' path='os/linux/smb.c' language='LANG_C99'>
     <array-type-def dimensions='1' type-id='a84c031d' size-in-bits='2040' id='11641789'>
@@ -1373,7 +1369,7 @@
     <typedef-decl name='zpool_handle_t' type-id='67002a8a' id='b1efc708'/>
     <typedef-decl name='libzfs_handle_t' type-id='c8a9d9d8' id='95942d0c'/>
     <typedef-decl name='zfs_iter_f' type-id='5571cde4' id='d8e49ab9'/>
-    <class-decl name='libzfs_handle' size-in-bits='20224' is-struct='yes' visibility='default' id='c8a9d9d8'>
+    <class-decl name='libzfs_handle' size-in-bits='20352' is-struct='yes' visibility='default' id='c8a9d9d8'>
       <data-member access='public' layout-offset-in-bits='0'>
         <var-decl name='libzfs_error' type-id='95e97e5e' visibility='default'/>
       </data-member>
@@ -1434,6 +1430,12 @@
       <data-member access='public' layout-offset-in-bits='20160'>
         <var-decl name='libzfs_max_nvlist' type-id='9c313c2d' visibility='default'/>
       </data-member>
+      <data-member access='public' layout-offset-in-bits='20224'>
+        <var-decl name='libfetch' type-id='eaa32e2f' visibility='default'/>
+      </data-member>
+      <data-member access='public' layout-offset-in-bits='20288'>
+        <var-decl name='libfetch_load_error' type-id='26a90f95' visibility='default'/>
+      </data-member>
     </class-decl>
     <class-decl name='zfs_handle' size-in-bits='4928' is-struct='yes' visibility='default' id='f6ee4445'>
       <data-member access='public' layout-offset-in-bits='0'>
@@ -3190,6 +3192,19 @@
     <function-decl name='__ctype_b_loc' visibility='default' binding='global' size-in-bits='64'>
       <return type-id='c59e1ef0'/>
     </function-decl>
+    <function-decl name='dlopen' visibility='default' binding='global' size-in-bits='64'>
+      <parameter type-id='80f4b756'/>
+      <parameter type-id='95e97e5e'/>
+      <return type-id='eaa32e2f'/>
+    </function-decl>
+    <function-decl name='dlsym' visibility='default' binding='global' size-in-bits='64'>
+      <parameter type-id='1b7446cd'/>
+      <parameter type-id='9d26089a'/>
+      <return type-id='eaa32e2f'/>
+    </function-decl>
+    <function-decl name='dlerror' visibility='default' binding='global' size-in-bits='64'>
+      <return type-id='26a90f95'/>
+    </function-decl>
     <function-decl name='PKCS5_PBKDF2_HMAC_SHA1' visibility='default' binding='global' size-in-bits='64'>
       <parameter type-id='80f4b756'/>
       <parameter type-id='95e97e5e'/>
@@ -3231,6 +3246,11 @@
       <parameter type-id='822cd80b'/>
       <return type-id='95e97e5e'/>
     </function-decl>
+    <function-decl name='fdopen' visibility='default' binding='global' size-in-bits='64'>
+      <parameter type-id='95e97e5e'/>
+      <parameter type-id='80f4b756'/>
+      <return type-id='822cd80b'/>
+    </function-decl>
     <function-decl name='printf' visibility='default' binding='global' size-in-bits='64'>
       <parameter type-id='80f4b756'/>
       <parameter is-variadic='yes'/>
@@ -3243,6 +3263,12 @@
       <parameter is-variadic='yes'/>
       <return type-id='95e97e5e'/>
     </function-decl>
+    <function-decl name='asprintf' visibility='default' binding='global' size-in-bits='64'>
+      <parameter type-id='8c85230f'/>
+      <parameter type-id='9d26089a'/>
+      <parameter is-variadic='yes'/>
+      <return type-id='95e97e5e'/>
+    </function-decl>
     <function-decl name='fputc' visibility='default' binding='global' size-in-bits='64'>
       <parameter type-id='95e97e5e'/>
       <parameter type-id='822cd80b'/>
@@ -3262,6 +3288,10 @@
       <parameter type-id='e75a27e9'/>
       <return type-id='b59d7dce'/>
     </function-decl>
+    <function-decl name='rewind' visibility='default' binding='global' size-in-bits='64'>
+      <parameter type-id='822cd80b'/>
+      <return type-id='48b5725f'/>
+    </function-decl>
     <function-decl name='ferror' visibility='default' binding='global' size-in-bits='64'>
       <parameter type-id='822cd80b'/>
       <return type-id='95e97e5e'/>
@@ -3285,6 +3315,10 @@
       <parameter type-id='b59d7dce'/>
       <return type-id='eaa32e2f'/>
     </function-decl>
+    <function-decl name='strdup' visibility='default' binding='global' size-in-bits='64'>
+      <parameter type-id='80f4b756'/>
+      <return type-id='26a90f95'/>
+    </function-decl>
     <function-decl name='strerror' visibility='default' binding='global' size-in-bits='64'>
       <parameter type-id='95e97e5e'/>
       <return type-id='26a90f95'/>
@@ -3317,6 +3351,10 @@
       <parameter type-id='95e97e5e'/>
       <return type-id='95e97e5e'/>
     </function-decl>
+    <function-decl name='unlink' visibility='default' binding='global' size-in-bits='64'>
+      <parameter type-id='80f4b756'/>
+      <return type-id='95e97e5e'/>
+    </function-decl>
     <function-type size-in-bits='64' id='ee076206'>
       <return type-id='48b5725f'/>
     </function-type>
@@ -4425,12 +4463,6 @@
       <parameter is-variadic='yes'/>
       <return type-id='95e97e5e'/>
     </function-decl>
-    <function-decl name='asprintf' visibility='default' binding='global' size-in-bits='64'>
-      <parameter type-id='8c85230f'/>
-      <parameter type-id='9d26089a'/>
-      <parameter is-variadic='yes'/>
-      <return type-id='95e97e5e'/>
-    </function-decl>
     <function-decl name='strtol' visibility='default' binding='global' size-in-bits='64'>
       <parameter type-id='9d26089a'/>
       <parameter type-id='8c85230f'/>
@@ -4452,10 +4484,6 @@
       <parameter type-id='b59d7dce'/>
       <return type-id='26a90f95'/>
     </function-decl>
-    <function-decl name='strdup' visibility='default' binding='global' size-in-bits='64'>
-      <parameter type-id='80f4b756'/>
-      <return type-id='26a90f95'/>
-    </function-decl>
     <function-decl name='strrchr' visibility='default' binding='global' size-in-bits='64'>
       <parameter type-id='80f4b756'/>
       <parameter type-id='95e97e5e'/>
@@ -4620,11 +4648,6 @@
       <parameter type-id='4051f5e7'/>
       <return type-id='95e97e5e'/>
     </function-decl>
-    <function-decl name='fdopen' visibility='default' binding='global' size-in-bits='64'>
-      <parameter type-id='95e97e5e'/>
-      <parameter type-id='80f4b756'/>
-      <return type-id='822cd80b'/>
-    </function-decl>
     <function-decl name='pipe2' visibility='default' binding='global' size-in-bits='64'>
       <parameter type-id='7292109c'/>
       <parameter type-id='95e97e5e'/>
@@ -6705,6 +6728,12 @@
       <parameter type-id='95e97e5e'/>
       <return type-id='48b5725f'/>
     </function-decl>
+    <function-decl name='avl_insert' visibility='default' binding='global' size-in-bits='64'>
+      <parameter type-id='a3681dea'/>
+      <parameter type-id='eaa32e2f'/>
+      <parameter type-id='fba6cb51'/>
+      <return type-id='48b5725f'/>
+    </function-decl>
     <function-decl name='nvlist_lookup_boolean' visibility='default' binding='global' size-in-bits='64'>
       <parameter type-id='5ce45b60'/>
       <parameter type-id='80f4b756'/>
@@ -7235,6 +7264,10 @@
     <function-decl name='__ctype_toupper_loc' visibility='default' binding='global' size-in-bits='64'>
       <return type-id='24f95ba5'/>
     </function-decl>
+    <function-decl name='dlclose' visibility='default' binding='global' size-in-bits='64'>
+      <parameter type-id='eaa32e2f'/>
+      <return type-id='95e97e5e'/>
+    </function-decl>
     <function-decl name='regcomp' visibility='default' binding='global' size-in-bits='64'>
       <parameter type-id='5c53ba29'/>
       <parameter type-id='9d26089a'/>

lib/libzfs/libzfs_crypto.c

@@ -26,6 +26,16 @@
 #include <signal.h>
 #include <errno.h>
 #include <openssl/evp.h>
+#if LIBFETCH_DYNAMIC
+#include <dlfcn.h>
+#endif
+#if LIBFETCH_IS_FETCH
+#include <sys/param.h>
+#include <stdio.h>
+#include <fetch.h>
+#elif LIBFETCH_IS_LIBCURL
+#include <curl/curl.h>
+#endif
 #include <libzfs.h>
 #include "libzfs_impl.h"
 #include "zfeature_common.h"
@@ -59,9 +69,13 @@ static int caught_interrupt;
 
 static int get_key_material_file(libzfs_handle_t *, const char *, const char *,
     zfs_keyformat_t, boolean_t, uint8_t **, size_t *);
+static int get_key_material_https(libzfs_handle_t *, const char *, const char *,
+    zfs_keyformat_t, boolean_t, uint8_t **, size_t *);
 
 static zfs_uri_handler_t uri_handlers[] = {
 	{ "file", get_key_material_file },
+	{ "https", get_key_material_https },
+	{ "http", get_key_material_https },
 	{ NULL, NULL }
 };
 
@@ -483,6 +497,178 @@ get_key_material_file(libzfs_handle_t *hdl, const char *uri,
 	return (ret);
 }
 
+static int
+get_key_material_https(libzfs_handle_t *hdl, const char *uri,
+    const char *fsname, zfs_keyformat_t keyformat, boolean_t newkey,
+    uint8_t **restrict buf, size_t *restrict len_out)
+{
+	int ret = 0;
+	FILE *key = NULL;
+	boolean_t is_http = strncmp(uri, "http:", strlen("http:")) == 0;
+
+	if (strlen(uri) < (is_http ? 7 : 8)) {
+		ret = EINVAL;
+		goto end;
+	}
+
+#if LIBFETCH_DYNAMIC
+#define	LOAD_FUNCTION(func) \
+	__typeof__(func) *func = dlsym(hdl->libfetch, #func);
+
+	if (hdl->libfetch == NULL)
+		hdl->libfetch = dlopen(LIBFETCH_SONAME, RTLD_LAZY);
+
+	if (hdl->libfetch == NULL) {
+		hdl->libfetch = (void *)-1;
+		char *err = dlerror();
+		if (err)
+			hdl->libfetch_load_error = strdup(err);
+	}
+
+	if (hdl->libfetch == (void *)-1) {
+		ret = ENOSYS;
+		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
+		    "Couldn't load %s: %s"),
+		    LIBFETCH_SONAME, hdl->libfetch_load_error ?: "(?)");
+		goto end;
+	}
+
+	boolean_t ok;
+#if LIBFETCH_IS_FETCH
+	LOAD_FUNCTION(fetchGetURL);
+	char *fetchLastErrString = dlsym(hdl->libfetch, "fetchLastErrString");
+
+	ok = fetchGetURL && fetchLastErrString;
+#elif LIBFETCH_IS_LIBCURL
+	LOAD_FUNCTION(curl_easy_init);
+	LOAD_FUNCTION(curl_easy_setopt);
+	LOAD_FUNCTION(curl_easy_perform);
+	LOAD_FUNCTION(curl_easy_cleanup);
+	LOAD_FUNCTION(curl_easy_strerror);
+	LOAD_FUNCTION(curl_easy_getinfo);
+
+	ok = curl_easy_init && curl_easy_setopt && curl_easy_perform &&
+	    curl_easy_cleanup && curl_easy_strerror && curl_easy_getinfo;
+#endif
+	if (!ok) {
+		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
+		    "keylocation=%s back-end %s missing symbols."),
+		    is_http ? "http://" : "https://", LIBFETCH_SONAME);
+		ret = ENOSYS;
+		goto end;
+	}
+#endif
+
+#if LIBFETCH_IS_FETCH
+	key = fetchGetURL(uri, "");
+	if (key == NULL) {
+		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
+		    "Couldn't GET %s: %s"),
+		    uri, fetchLastErrString);
+		ret = ENETDOWN;
+	}
+#elif LIBFETCH_IS_LIBCURL
+	CURL *curl = curl_easy_init();
+	if (curl == NULL) {
+		ret = ENOTSUP;
+		goto end;
+	}
+
+	int kfd = -1;
+#ifdef O_TMPFILE
+	kfd = open(getenv("TMPDIR") ?: "/tmp",
+	    O_RDWR | O_TMPFILE | O_EXCL | O_CLOEXEC, 0600);
+	if (kfd != -1)
+		goto kfdok;
+#endif
+
+	char *path;
+	if (asprintf(&path,
+	    "%s/libzfs-XXXXXXXX.https", getenv("TMPDIR") ?: "/tmp") == -1) {
+		ret = ENOMEM;
+		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "%s"),
+		    strerror(ret));
+		goto end;
+	}
+
+	kfd = mkostemps(path, strlen(".https"), O_CLOEXEC);
+	if (kfd == -1) {
+		ret = errno;
+		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
+		    "Couldn't create temporary file %s: %s"),
+		    path, strerror(ret));
+		free(path);
+		goto end;
+	}
+	(void) unlink(path);
+	free(path);
+
+kfdok:
+	if ((key = fdopen(kfd, "r+")) == NULL) {
+		ret = errno;
+		free(path);
+		(void) close(kfd);
+		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
+		    "Couldn't reopen temporary file: %s"), strerror(ret));
+		goto end;
+	}
+
+	char errbuf[CURL_ERROR_SIZE] = "";
+	char *cainfo = getenv("SSL_CA_CERT_FILE"); /* matches fetch(3) */
+	char *capath = getenv("SSL_CA_CERT_PATH"); /* matches fetch(3) */
+	char *clcert = getenv("SSL_CLIENT_CERT_FILE"); /* matches fetch(3) */
+	char *clkey  = getenv("SSL_CLIENT_KEY_FILE"); /* matches fetch(3) */
+	(void) curl_easy_setopt(curl, CURLOPT_URL, uri);
+	(void) curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1L);
+	(void) curl_easy_setopt(curl, CURLOPT_TIMEOUT_MS, 30000L);
+	(void) curl_easy_setopt(curl, CURLOPT_WRITEDATA, key);
+	(void) curl_easy_setopt(curl, CURLOPT_ERRORBUFFER, errbuf);
+	if (cainfo != NULL)
+		(void) curl_easy_setopt(curl, CURLOPT_CAINFO, cainfo);
+	if (capath != NULL)
+		(void) curl_easy_setopt(curl, CURLOPT_CAPATH, capath);
+	if (clcert != NULL)
+		(void) curl_easy_setopt(curl, CURLOPT_SSLCERT, clcert);
+	if (clkey != NULL)
+		(void) curl_easy_setopt(curl, CURLOPT_SSLKEY, clkey);
+
+	CURLcode res = curl_easy_perform(curl);
+
+	if (res != CURLE_OK) {
+		zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
+		    "Failed to connect to %s: %s"),
+		    uri, strlen(errbuf) ? errbuf : curl_easy_strerror(res));
+		ret = ENETDOWN;
+	} else {
+		long resp = 200;
+		(void) curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &resp);
+
+		if (resp < 200 || resp >= 300) {
+			zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
+			    "Couldn't GET %s: %ld"),
+			    uri, resp);
+			ret = ENOENT;
+		} else
+			rewind(key);
+	}
+
+	curl_easy_cleanup(curl);
+#else
+	zfs_error_aux(hdl, dgettext(TEXT_DOMAIN,
+	    "No keylocation=%s back-end."), is_http ? "http://" : "https://");
+	ret = ENOSYS;
+#endif
+
+end:
+	if (ret == 0)
+		ret = get_key_material_raw(key, keyformat, buf, len_out);
+
+	if (key != NULL)
+		fclose(key);
+
+	return (ret);
+}
+
 /*
  * Attempts to fetch key material, no matter where it might live. The key
  * material is allocated and returned in km_out. *can_retry_out will be set

lib/libzfs/libzfs_util.c

@@ -44,6 +44,9 @@
 #include <strings.h>
 #include <unistd.h>
 #include <math.h>
+#if LIBFETCH_DYNAMIC
+#include <dlfcn.h>
+#endif
 #include <sys/stat.h>
 #include <sys/mnttab.h>
 #include <sys/mntent.h>
@@ -1101,6 +1104,11 @@ libzfs_fini(libzfs_handle_t *hdl)
 	libzfs_core_fini();
 	regfree(&hdl->libzfs_urire);
 	fletcher_4_fini();
+#if LIBFETCH_DYNAMIC
+	if (hdl->libfetch != (void *)-1 && hdl->libfetch != NULL)
+		(void) dlclose(hdl->libfetch);
+	free(hdl->libfetch_load_error);
+#endif
 	free(hdl);
 }
 

man/man7/zfsprops.7

@@ -1099,7 +1099,7 @@ Even though the encryption suite cannot be changed after dataset creation,
 the keyformat can be with
 .Nm zfs Cm change-key .
 .It Xo
-.Sy keylocation Ns = Ns Sy prompt Ns | Ns Sy file:// Ns Em </absolute/file/path>
+.Sy keylocation Ns = Ns Sy prompt Ns | Ns Sy file:// Ns Em </absolute/file/path> Ns | Ns Sy https:// Ns Em <address> | Ns Sy http:// Ns Em <address>
 .Xc
 Controls where the user's encryption key will be loaded from by default for
 commands such as
@@ -1126,6 +1126,24 @@ but users should be careful not to place keys which should be kept secret on
 the command line.
 If a file URI is selected, the key will be loaded from the
 specified absolute file path.
+If an HTTPS or HTTP URL is selected, it will be GETted using
+.Xr fetch 3 ,
+libcurl, or nothing, depending on compile-time configuration and run-time
+availability.
+The
+.Ev SSL_CA_CERT_FILE
+environment variable can be set to set the location
+of the concatenated certificate store.
+The
+.Ev SSL_CA_CERT_PATH
+environment variable can be set to override the location
+of the directory containing the certificate authority bundle.
+The
+.Ev SSL_CLIENT_CERT_FILE
+and
+.Ev SSL_CLIENT_KEY_FILE
+environment variables can be set to configure the path
+to the client certificate and its key.
 .It Sy pbkdf2iters Ns = Ns Ar iterations
 Controls the number of PBKDF2 iterations that a
 .Sy passphrase

module/zcommon/zfs_prop.c

@@ -583,7 +583,7 @@ zfs_prop_init(void)
 	    "ENCROOT");
 	zprop_register_string(ZFS_PROP_KEYLOCATION, "keylocation",
 	    "none", PROP_DEFAULT, ZFS_TYPE_FILESYSTEM | ZFS_TYPE_VOLUME,
-	    "prompt | <file URI>", "KEYLOCATION");
+	    "prompt | <file URI> | <https URL> | <http URL>", "KEYLOCATION");
 	zprop_register_string(ZFS_PROP_REDACT_SNAPS,
 	    "redact_snaps", NULL, PROP_READONLY,
 	    ZFS_TYPE_DATASET | ZFS_TYPE_BOOKMARK, "<snapshot>[,...]",
@@ -936,6 +936,10 @@ zfs_prop_valid_keylocation(const char *str, boolean_t encrypted)
 		return (B_TRUE);
 	else if (strlen(str) > 8 && strncmp("file:///", str, 8) == 0)
 		return (B_TRUE);
+	else if (strlen(str) > 8 && strncmp("https://", str, 8) == 0)
+		return (B_TRUE);
+	else if (strlen(str) > 7 && strncmp("http://", str, 7) == 0)
+		return (B_TRUE);
 
 	return (B_FALSE);
 }

tests/runfiles/common.run

@@ -198,7 +198,8 @@ tags = ['functional', 'cli_root', 'zfs_inherit']
 
 [tests/functional/cli_root/zfs_load-key]
 tests = ['zfs_load-key', 'zfs_load-key_all', 'zfs_load-key_file',
-    'zfs_load-key_location', 'zfs_load-key_noop', 'zfs_load-key_recursive']
+    'zfs_load-key_https', 'zfs_load-key_location', 'zfs_load-key_noop',
+    'zfs_load-key_recursive']
 tags = ['functional', 'cli_root', 'zfs_load-key']
 
 [tests/functional/cli_root/zfs_mount]

tests/runfiles/sanity.run

@@ -146,7 +146,8 @@ tags = ['functional', 'cli_root', 'zfs_inherit']
 
 [tests/functional/cli_root/zfs_load-key]
 tests = ['zfs_load-key', 'zfs_load-key_all', 'zfs_load-key_file',
-    'zfs_load-key_location', 'zfs_load-key_noop', 'zfs_load-key_recursive']
+    'zfs_load-key_https', 'zfs_load-key_location', 'zfs_load-key_noop',
+    'zfs_load-key_recursive']
 tags = ['functional', 'cli_root', 'zfs_load-key']
 
 [tests/functional/cli_root/zfs_mount]

tests/zfs-tests/tests/functional/cli_root/zfs_load-key/Makefile.am

@@ -5,6 +5,7 @@ dist_pkgdata_SCRIPTS = \
 	zfs_load-key.ksh \
 	zfs_load-key_all.ksh \
 	zfs_load-key_file.ksh \
+	zfs_load-key_https.ksh \
 	zfs_load-key_location.ksh \
 	zfs_load-key_noop.ksh \
 	zfs_load-key_recursive.ksh

tests/zfs-tests/tests/functional/cli_root/zfs_load-key/cleanup.ksh

@@ -26,5 +26,7 @@
 #
 
 . $STF_SUITE/include/libtest.shlib
+. $STF_SUITE/tests/functional/cli_root/zfs_load-key/zfs_load-key_common.kshlib
 
+cleanup_https
 default_cleanup

tests/zfs-tests/tests/functional/cli_root/zfs_load-key/setup.ksh

@@ -26,7 +26,10 @@
 #
 
 . $STF_SUITE/include/libtest.shlib
+. $STF_SUITE/tests/functional/cli_root/zfs_load-key/zfs_load-key_common.kshlib
 
 DISK=${DISKS%% *}
 
-default_setup $DISK
+default_setup_noexit $DISK
+setup_https
+log_pass

tests/zfs-tests/tests/functional/cli_root/zfs_load-key/zfs_load-key.cfg

@@ -27,3 +27,31 @@ export HEXKEY="000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F"
 export HEXKEY1="201F1E1D1C1B1A191817161514131211100F0E0D0C0B0A090807060504030201"
 export RAWKEY="aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
 export RAWKEY1="bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb"
+
+export SSL_CA_CERT_FILE="/$TESTPOOL/snakeoil.crt"
+export HTTPS_PORT_FILE="/$TESTPOOL/snakeoil.port"
+export HTTPS_HOSTNAME="localhost"
+export HTTPS_PORT=
+export HTTPS_BASE_URL=
+
+function get_https_port
+{
+	if [ -z "$HTTPS_PORT" ]; then
+		read -r HTTPS_PORT < "$HTTPS_PORT_FILE" || return
+	fi
+
+	echo "$HTTPS_PORT"
+}
+
+function get_https_base_url
+{
+	if [ -z "$HTTPS_BASE_URL" ]; then
+		HTTPS_BASE_URL="https://$HTTPS_HOSTNAME:$(get_https_port)" || {
+			typeset ret=$?
+			HTTPS_BASE_URL=
+			return $ret
+		}
+	fi
+
+	echo "$HTTPS_BASE_URL"
+}

tests/zfs-tests/tests/functional/cli_root/zfs_load-key/zfs_load-key_all.ksh

@@ -38,6 +38,7 @@ verify_runnable "both"
 function cleanup
 {
 	datasetexists $TESTPOOL/$TESTFS1 && destroy_dataset $TESTPOOL/$TESTFS1
+	datasetexists $TESTPOOL/$TESTFS2 && destroy_dataset $TESTPOOL/$TESTFS2
 	datasetexists $TESTPOOL/zvol && destroy_dataset $TESTPOOL/zvol
 	poolexists $TESTPOOL1 && log_must destroy_pool $TESTPOOL1
 }
@@ -49,6 +50,9 @@ log_must eval "echo $PASSPHRASE1 > /$TESTPOOL/pkey"
 log_must zfs create -o encryption=on -o keyformat=passphrase \
 	-o keylocation=file:///$TESTPOOL/pkey $TESTPOOL/$TESTFS1
 
+log_must zfs create -o encryption=on -o keyformat=passphrase \
+	-o keylocation=$(get_https_base_url)/PASSPHRASE $TESTPOOL/$TESTFS2
+
 log_must zfs create -V 64M -o encryption=on -o keyformat=passphrase \
 	-o keylocation=file:///$TESTPOOL/pkey $TESTPOOL/zvol
 
@@ -59,6 +63,9 @@ log_must zpool create -O encryption=on -O keyformat=passphrase \
 log_must zfs unmount $TESTPOOL/$TESTFS1
 log_must_busy zfs unload-key $TESTPOOL/$TESTFS1
 
+log_must zfs unmount $TESTPOOL/$TESTFS2
+log_must_busy zfs unload-key $TESTPOOL/$TESTFS2
+
 log_must_busy zfs unload-key $TESTPOOL/zvol
 
 log_must zfs unmount $TESTPOOL1
@@ -69,8 +76,10 @@ log_must zfs load-key -a
 log_must key_available $TESTPOOL1
 log_must key_available $TESTPOOL/zvol
 log_must key_available $TESTPOOL/$TESTFS1
+log_must key_available $TESTPOOL/$TESTFS2
 
 log_must zfs mount $TESTPOOL1
 log_must zfs mount $TESTPOOL/$TESTFS1
+log_must zfs mount $TESTPOOL/$TESTFS2
 
 log_pass "'zfs load-key -a' loads keys for all datasets"

tests/zfs-tests/tests/functional/cli_root/zfs_load-key/zfs_load-key_common.kshlib

@@ -99,3 +99,66 @@ function verify_origin
 
 	return 0
 }
+
+function setup_https
+{
+	log_must openssl req -x509 -newkey rsa:4096 -sha256 -days 1 -nodes -keyout "/$TESTPOOL/snakeoil.key" -out "$SSL_CA_CERT_FILE" -subj "/CN=$HTTPS_HOSTNAME"
+
+	python3 -uc "
+import http.server, ssl, sys, os, time, random
+
+sys.stdin.close()
+
+httpd, err, port = None, None, None
+for i in range(1, 100):
+	port = random.randint(0xC000, 0xFFFF) # ephemeral range
+	try:
+		httpd = http.server.HTTPServer(('$HTTPS_HOSTNAME', port), http.server.SimpleHTTPRequestHandler)
+		break
+	except:
+		err = sys.exc_info()[1]
+		time.sleep(i / 100)
+if not httpd:
+	raise err
+
+with open('$HTTPS_PORT_FILE', 'w') as portf:
+	print(port, file=portf)
+
+httpd.socket = ssl.wrap_socket(httpd.socket, server_side=True, keyfile='/$TESTPOOL/snakeoil.key', certfile='$SSL_CA_CERT_FILE', ssl_version=ssl.PROTOCOL_TLS)
+
+os.chdir('$STF_SUITE/tests/functional/cli_root/zfs_load-key')
+
+with open('/$TESTPOOL/snakeoil.pid', 'w') as pidf:
+	if os.fork() != 0:
+	  os._exit(0)
+	print(os.getpid(), file=pidf)
+
+sys.stdout.close()
+sys.stderr.close()
+try:
+	sys.stdout = sys.stderr = open('/tmp/ZTS-snakeoil.log', 'w', buffering=1) # line
+except:
+	sys.stdout = sys.stderr = open('/dev/null', 'w')
+
+print('{} start on {}'.format(os.getpid(), port))
+httpd.serve_forever()
+" || log_fail
+
+	typeset https_pid=
+	for d in $(seq 0 0.1 5); do
+		read -r https_pid 2>/dev/null < "/$TESTPOOL/snakeoil.pid" && [ -n "$https_pid" ] && break
+		sleep "$d"
+	done
+	[ -z "$https_pid" ] && log_fail "Couldn't start HTTPS server"
+	log_note "Started HTTPS server as $https_pid on port $(get_https_port)"
+}
+
+function cleanup_https
+{
+	typeset https_pid=
+	read -r https_pid 2>/dev/null < "/$TESTPOOL/snakeoil.pid" || return 0
+
+	log_must kill "$https_pid"
+	cat /tmp/ZTS-snakeoil.log
+	rm -f "/$TESTPOOL/snakeoil.pid" "/tmp/ZTS-snakeoil.log"
+}

tests/zfs-tests/tests/functional/cli_root/zfs_load-key/zfs_load-key_https.ksh

@@ -0,0 +1,78 @@
+#!/bin/ksh -p
+#
+# CDDL HEADER START
+#
+# This file and its contents are supplied under the terms of the
+# Common Development and Distribution License ("CDDL"), version 1.0.
+# You may only use this file in accordance with the terms of version
+# 1.0 of the CDDL.
+#
+# A full copy of the text of the CDDL should have accompanied this
+# source.  A copy of the CDDL is also available via the Internet at
+# http://www.illumos.org/license/CDDL.
+#
+# CDDL HEADER END
+#
+
+. $STF_SUITE/include/libtest.shlib
+. $STF_SUITE/tests/functional/cli_root/zfs_load-key/zfs_load-key_common.kshlib
+
+#
+# DESCRIPTION:
+# 'zfs load-key' should load a dataset's key from an https:// URL,
+# but fail to do so if the domain doesn't exist or the file 404s.
+#
+# STRATEGY:
+# 1. Try to create a dataset pointing to an RFC6761-guaranteed unresolvable domain,
+#    one to the sshd port (which will be either unoccupied (ECONNREFUSED)
+#                          or have sshd on it ("wrong version number")).
+#    and one pointing to an URL that will always 404.
+# 2. Create encrypted datasets with keylocation=https://address
+# 3. Unmount the datasets and unload their keys
+# 4. Attempt to load the keys
+# 5. Verify the keys are loaded
+# 6. Attempt to mount the datasets
+#
+
+verify_runnable "both"
+
+function cleanup
+{
+	for fs in "$TESTFS1" "$TESTFS2" "$TESTFS3"; do
+		datasetexists $TESTPOOL/$fs && \
+			log_must zfs destroy $TESTPOOL/$fs
+	done
+}
+log_onexit cleanup
+
+log_assert "'zfs load-key' should load a key from a file"
+
+log_mustnot zfs create -o encryption=on -o keyformat=passphrase \
+	-o keylocation=https://invalid./where-ever $TESTPOOL/$TESTFS1
+
+log_mustnot zfs create -o encryption=on -o keyformat=passphrase \
+	-o keylocation=https://$HTTPS_HOSTNAME:22 $TESTPOOL/$TESTFS1
+
+log_mustnot zfs create -o encryption=on -o keyformat=passphrase \
+	-o keylocation=$(get_https_base_url)/ENOENT $TESTPOOL/$TESTFS1
+
+log_must zfs create -o encryption=on -o keyformat=passphrase \
+	-o keylocation=$(get_https_base_url)/PASSPHRASE $TESTPOOL/$TESTFS1
+
+log_must zfs create -o encryption=on -o keyformat=hex \
+	-o keylocation=$(get_https_base_url)/HEXKEY $TESTPOOL/$TESTFS2
+
+log_must zfs create -o encryption=on -o keyformat=raw \
+	-o keylocation=$(get_https_base_url)/RAWKEY $TESTPOOL/$TESTFS3
+
+for fs in "$TESTFS1" "$TESTFS2" "$TESTFS3"; do
+	log_must zfs unmount $TESTPOOL/$fs
+	log_must zfs unload-key $TESTPOOL/$fs
+done
+for fs in "$TESTFS1" "$TESTFS2" "$TESTFS3"; do
+	log_must zfs load-key $TESTPOOL/$fs
+	log_must key_available $TESTPOOL/$fs
+	log_must zfs mount $TESTPOOL/$fs
+done
+
+log_pass "'zfs load-key' loads a key from a file"

tests/zfs-tests/tests/functional/cli_root/zfs_load-key/zfs_load-key_location.ksh

@@ -70,4 +70,9 @@ log_must eval "echo $PASSPHRASE | zfs load-key -L prompt $TESTPOOL/$TESTFS1"
 log_must key_available $TESTPOOL/$TESTFS1
 log_must verify_keylocation $TESTPOOL/$TESTFS1 "file://$key_location"
 
+log_must zfs unload-key $TESTPOOL/$TESTFS1
+log_must zfs load-key -L $(get_https_base_url)/PASSPHRASE $TESTPOOL/$TESTFS1
+log_must key_available $TESTPOOL/$TESTFS1
+log_must verify_keylocation $TESTPOOL/$TESTFS1 "file://$key_location"
+
 log_pass "'zfs load-key -L' overrides keylocation with provided value"

tests/zfs-tests/tests/functional/cli_root/zfs_load-key/zfs_load-key_recursive.ksh

@@ -52,15 +52,21 @@ log_must zfs create -o encryption=on -o keyformat=passphrase \
 log_must zfs create -o keyformat=passphrase \
 	-o keylocation=file:///$TESTPOOL/pkey $TESTPOOL/$TESTFS1/child
 
+log_must zfs create -o keyformat=passphrase \
+	-o keylocation=$(get_https_base_url)/PASSPHRASE $TESTPOOL/$TESTFS1/child/child
+
 log_must zfs unmount $TESTPOOL/$TESTFS1
+log_must zfs unload-key $TESTPOOL/$TESTFS1/child/child
 log_must zfs unload-key $TESTPOOL/$TESTFS1/child
 log_must zfs unload-key $TESTPOOL/$TESTFS1
 
 log_must zfs load-key -r $TESTPOOL
 log_must key_available $TESTPOOL/$TESTFS1
 log_must key_available $TESTPOOL/$TESTFS1/child
+log_must key_available $TESTPOOL/$TESTFS1/child/child
 
 log_must zfs mount $TESTPOOL/$TESTFS1
 log_must zfs mount $TESTPOOL/$TESTFS1/child
+log_must zfs mount $TESTPOOL/$TESTFS1/child/child
 
 log_pass "'zfs load-key -r' recursively loads keys"

tests/zfs-tests/tests/functional/cli_root/zfs_set/zfs_set_keylocation.ksh

@@ -50,8 +50,8 @@ function cleanup
 }
 log_onexit cleanup
 
-log_assert "Key location can only be 'prompt' or a file path for encryption" \
+log_assert "Key location can only be 'prompt', 'file://', or 'https://'" \
-	"roots, and 'none' for unencrypted volumes"
+	"for encryption roots, and 'none' for unencrypted volumes"
 
 log_must eval "echo $PASSPHRASE > /$TESTPOOL/pkey"
 
@@ -65,19 +65,15 @@ log_must zfs create -o encryption=on -o keyformat=passphrase \
 	-o keylocation=file:///$TESTPOOL/pkey $TESTPOOL/$TESTFS1
 
 log_mustnot zfs set keylocation=none $TESTPOOL/$TESTFS1
-if true; then
 log_mustnot zfs set keylocation=/$TESTPOOL/pkey $TESTPOOL/$TESTFS1
-else
-	### SOON: ###
-	# file:///$TESTPOOL/pkey and /$TESTPOOL/pkey are equivalent on FreeBSD
-	# thanks to libfetch. Eventually we want to make the other platforms
-	# work this way as well, either by porting libfetch or by other means.
-	log_must zfs set keylocation=/$TESTPOOL/pkey $TESTPOOL/$TESTFS1
-fi
 
 log_must zfs set keylocation=file:///$TESTPOOL/pkey $TESTPOOL/$TESTFS1
 log_must verify_keylocation $TESTPOOL/$TESTFS1 "file:///$TESTPOOL/pkey"
 
+setup_https
+log_must zfs set keylocation=$(get_https_base_url)/PASSPHRASE $TESTPOOL/$TESTFS1
+log_must verify_keylocation $TESTPOOL/$TESTFS1 "$(get_https_base_url)/PASSPHRASE"
+
 log_must zfs set keylocation=prompt $TESTPOOL/$TESTFS1
 log_must verify_keylocation $TESTPOOL/$TESTFS1 "prompt"
 
@@ -98,5 +94,5 @@ log_mustnot zfs set keylocation=/$TESTPOOL/pkey $TESTPOOL/$TESTFS1/child
 
 log_must verify_keylocation $TESTPOOL/$TESTFS1/child "none"
 
-log_pass "Key location can only be 'prompt' or a file path for encryption" \
+log_pass "Key location can only be 'prompt', 'file://', or 'https://'" \
-	"roots, and 'none' for unencrypted volumes"
+	"for encryption roots, and 'none' for unencrypted volumes"