unbound: log openssl-1.0.2 lacks TLS host verification

ssl_set1_host() is not available without openssl-1.1.0. Unbound can not do
host cert verification. DNS over TLS connects, but hosts are unverified. A
patch for log err is added with a noitce in README.md.
(see: https://www.nlnetlabs.nl/bugs-script/show_bug.cgi?id=658)

Also, squash some minor robustness and TLS usability fixes.

Signed-off-by: Eric Luehrsen <ericluehrsen@gmail.com>

5 files changed, 67 insertions, 20 deletions

diff --git a/net/unbound/files/README.md b/net/unbound/files/README.md
index d22d56681..812d9a607 100644
--- a/net/unbound/files/README.md
+++ b/net/unbound/files/README.md
@@ -166,11 +166,9 @@ config zone
 ```
 
 ## HOW TO: TLS Over DNS
-Unbound has the ability to be client and server in TLS mode. UCI can configure Unbound to be a client forwarding queries in TLS mode for selected domains. (Server is more complex to setup and needs to be done manually). This may be desired for privacy against stealth market tracking in some cases. Some public DNS servers seem to advertise help in this quest.
+Unbound can use TLS as a client or server. UCI supports Unbound as a forwarding client with TLS. Servers are more complex and need manual configuration. This may be desired for privacy against stealth tracking. Some public DNS servers seem to advertise help in this quest. If your looking for a better understanding, then some information can be found at [Cloudflare](https://www.cloudflare.com/) DNS [1.1.1.1](https://1.1.1.1/). The following is a generic example. You can mix providers by using complete server specificaiton to override the zones common port and certificate domain index.
 
-Unbound will make TLS connections without validation unless you install the 'ca-bundle' package. Do **not**  however forget to maintain the certification bundle. The validation chain otherwise will expire and connections will go dead. Unbound makes and breaks TCP connections per connection. To reduce the lag from TLS handshaking it may help to use more cache memory `resource`, increase record exirations `ttl_min`, enable `aggressive` searching, or manually enable prefetch options.
-
-The following is a generic example. If your looking for a better understanding, then some information can be found at [Cloudflare](https://www.cloudflare.com/) DNS [1.1.1.1](https://1.1.1.1/) for one place.
+**NOTICE:** Unbound requires openssl-1.1.0 to verify host certificates. OpenWrt at present is configured with openssl-1.0.2. Connections will be over TLS, but theoretically, certificates may not be from a trusted source. See report [Unbound #658](https://www.nlnetlabs.nl/bugs-script/show_bug.cgi?id=658). When this is resolved, it will be recommended again to install `ca-bundle`, maintain it, and be sure to include the TLS certificate domain index with the host addresses.
 
 **/etc/config/unbound**:
 ```
@@ -179,10 +177,14 @@ config zone
   # question: do you want to recurse when TLS fails or not?
   option fallback '0'
   option tls_index 'dns.example.net'
+  option tls_port '853'
   option tls_upstream '1'
   option zone_type 'forward_zone'
+  # these servers assume a common TLS port/index
   list server '192.0.2.53'
   list server '2001:db8::53'
+  # this alternate server is fully specified inline
+  list server '192.0.2.153@443#dns.alternate.example.org'
   list zone_name '.'
 ```
 
diff --git a/net/unbound/files/dnsmasq.sh b/net/unbound/files/dnsmasq.sh
index 7ab77592d..8eb1d03c6 100644
--- a/net/unbound/files/dnsmasq.sh
+++ b/net/unbound/files/dnsmasq.sh
@@ -80,7 +80,7 @@ create_host_record() {
 
 
     case $ip in
-      fe80:*|169.254.*)
+      fe[89ab][0-9a-f]:*|169.254.*)
         debug_ip="$ip@$host"
         ;;
 
diff --git a/net/unbound/files/iptools.sh b/net/unbound/files/iptools.sh
index c2ec7a06b..4919a9973 100644
--- a/net/unbound/files/iptools.sh
+++ b/net/unbound/files/iptools.sh
@@ -124,6 +124,20 @@ valid_subnet4() {
 
 ##############################################################################
 
+valid_subnet_any() {
+  local subnet=$1
+  local validip4=$( valid_subnet4 $subnet )
+  local validip6=$( valid_subnet6 $subnet )
+
+
+  if [ "$validip4" = "ok" -o "$validip6" = "ok" ] ; then
+    echo "ok"
+  else
+    echo "not"
+  fi
+}
+##############################################################################
+
 private_subnet() {
   case "$1" in
     10"."*) echo "ok" ;;
diff --git a/net/unbound/files/unbound.init b/net/unbound/files/unbound.init
index ff827c4f0..c90839964 100755
--- a/net/unbound/files/unbound.init
+++ b/net/unbound/files/unbound.init
@@ -64,10 +64,9 @@ service_triggers() {
   if [ ! -f "$UB_TOTAL_CONF" -o -n "$UB_BOOT" ] ; then
     # Unbound is can be a bit heavy, so wait some on first start but any
     # interface coming up affects the trigger and delay so guarantee start
-    procd_add_raw_trigger "interface.*.up" 5000 /etc/init.d/unbound restart
+    procd_add_raw_trigger "interface.*.up" 3000 /etc/init.d/unbound restart
 
   elif [ -n "$triggers" ] ; then
-    PROCD_RELOAD_DELAY=2000
     procd_add_reload_trigger "unbound" "dhcp"
 
 
@@ -77,7 +76,6 @@ service_triggers() {
     done
 
   else
-    PROCD_RELOAD_DELAY=2000
     procd_add_reload_trigger "unbound" "dhcp"
   fi
 }
diff --git a/net/unbound/files/unbound.sh b/net/unbound/files/unbound.sh
index 49a015788..061331220 100644
--- a/net/unbound/files/unbound.sh
+++ b/net/unbound/files/unbound.sh
@@ -85,9 +85,8 @@ UB_LIST_ZONE_NAMES=""
 
 bundle_all_networks() {
   local cfg="$1"
-  local ifname ifdashname
+  local ifname ifdashname validip
   local subnet subnets subnets4 subnets6
-  local validip4 validip6
 
   network_get_subnets  subnets4 "$cfg"
   network_get_subnets6 subnets6 "$cfg"
@@ -99,11 +98,10 @@ bundle_all_networks() {
 
   if [ -n "$subnets" ] ; then
     for subnet in $subnets ; do
-      validip4=$( valid_subnet4 $subnet )
-      validip6=$( valid_subnet6 $subnet )
+      validip=$( valid_subnet_any $subnet )
 
 
-      if [ "$validip4" = "ok" -o "$validip6" = "ok" ] ; then
+      if [ "$validip" = "ok" ] ; then
         UB_LIST_NETW_ALL="$UB_LIST_NETW_ALL $ifdashname@$subnet"
       fi
     done
@@ -375,8 +373,10 @@ unbound_control() {
 
 unbound_zone() {
   local cfg=$1
+  local servers_ip=""
+  local servers_host=""
   local zone_sym zone_name zone_type zone_enabled zone_file
-  local tls_upstream fallback proivder
+  local tls_upstream fallback
   local server port tls_port tls_index tls_suffix url_dir
 
   if [ ! -f "$UB_ZONE_CONF" ] ; then
@@ -464,17 +464,50 @@ unbound_zone() {
 
 
       if [ -n "$UB_LIST_ZONE_NAMES" -a -n "$UB_LIST_ZONE_SERVERS" ] ; then
+        for server in $UB_LIST_ZONE_SERVERS ; do
+          if [ "$( valid_subnet_any $server )" = "not" ] ; then
+            case $server in
+              *@[0-9]*)
+                # unique Unbound option for server host name
+                servers_host="$servers_host $server"
+                ;;
+
+              *)
+                if [ "$tls_upstream" = "yes" ] ; then
+                  servers_host="$servers_host $server${tls_port:+@${tls_port}}"
+                else
+                  servers_host="$servers_host $server${port:+@${port}}"
+                fi
+            esac
+
+          else
+            case $server in
+              *[0-9]@[0-9]*)
+                # unique Unbound option for server address
+                servers_ip="$servers_ip $server"
+                ;;
+
+              *)
+                if [ "$tls_upstream" = "yes" ] ; then
+                  servers_ip="$servers_ip $server$tls_suffix"
+                else
+                  servers_ip="$servers_ip $server${port:+@${port}}"
+                fi
+            esac
+          fi
+        done
+
+
         for zonename in $UB_LIST_ZONE_NAMES ; do
           {
             # generate a forward-zone with or without tls
             echo "forward-zone:"
             echo "  name: $zonename"
-            for server in $UB_LIST_ZONE_SERVERS ; do
-              if [ "$tls_upstream" = "yes" ] ; then
-                echo "  forward-addr: $server${tls_suffix}"
-              else
-                echo "  forward-addr: $server${port:+@${port}}"
-              fi
+            for server in $servers_host ; do
+              echo "  forward-host: $server"
+            done
+            for server in $servers_ip ; do
+              echo "  forward-addr: $server"
             done
             echo "  forward-first: $fallback"
             echo "  forward-tls-upstream: $tls_upstream"