Add script to check reseeder host certificate validity

build.xml

@@ -1407,6 +1407,12 @@
     </target>
 
 
+    <target name="testscripts-net" >
+        <exec executable="tests/scripts/checkremotecerts.sh" failonerror="true" />
+    </target>
+
+    <target name="testscripts-all" depends="testscripts,testscripts-net" />
+
     <!-- <target name="syndie" >
         <ant dir="apps/syndie/java/" target="standalone" />
         <copy file="apps/syndie/java/syndie-standalone.zip" todir="." />

tests/scripts/checkremotecerts.sh

@@ -0,0 +1,84 @@
+#!/bin/sh
+set -e
+set -u
+
+if ! which openssl > /dev/null 2>&1 || ! which gnutls-cli > /dev/null 2>&1; then
+    echo "This script (currently) requires both gnutls and openssl" >&2
+    exit
+fi
+
+if pidof /usr/bin/tor > /dev/null 2>&1 && which torify > /dev/null 2>&1; then
+    echo "-- Detected Tor, will try using it --"
+    GNUTLS="torify gnutls-cli"
+else
+    GNUTLS="gnutls-cli"
+fi
+
+BASEDIR="$(dirname $0)/../../"
+cd "$BASEDIR"
+RESEEDHOSTS=$(sed -e '/\s\+"https:\/\/[-a-z0-9.]/!d' -e 's/.*"https:\/\/\([-a-z0-9.]\+\).*/\1/' router/java/src/net/i2p/router/networkdb/reseed/Reseeder.java)
+CACERTS=$(mktemp)
+WORK=$(mktemp -d)
+FAIL=0
+CERTHOME="installer/resources/certificates"
+
+
+assemble_ca() {
+    # Combine system certificates with the certificates shipped with I2P into
+    # a large CA file for use with gnutls-cli later
+    cat /etc/ssl/certs/ca-certificates.crt "$CERTHOME"/*/*.crt > "$CACERTS"
+}
+
+retry ()
+# retry function borrowed from zzz's sync-mtn script
+{
+    if [ $# -eq 0 ]
+    then
+        echo 'usage: $0 command args...'
+        exit 1
+    fi
+
+    i=1
+    while ! "$@"
+    do
+        echo "$0: try $i of $MAX failed for command $@"
+        if [ $i -ge $MAX ]
+        then
+            break
+        fi
+        i=$(expr $i + 1)
+        sleep 15
+    done
+}
+
+normalize(){
+    # The format displayed by gnutls-cli. This function is not used yet.
+    sed -e 's/^.*=//;s/://g;y/ABCDEF/abcdef/'
+}
+
+check() {
+for HOST in $RESEEDHOSTS; do
+    echo -n "Checking $HOST..."
+    # Using --insecure here for those cases in which our
+    retry $GNUTLS --insecure --print-cert --x509cafile="$CACERTS" "$HOST"  < /dev/null > "$WORK/$HOST.test"
+    if $(grep -q 'The certificate issuer is unknown' "$WORK/$HOST.test"); then
+        # If we end up here it's for one of two probable reasons:
+        # 1) the the CN in the certificate doesn't match the hostname.
+        # 2) the certificate is invalid
+        openssl x509 -in "$CERTHOME/ssl/$HOST.crt" -fingerprint -noout > "$WORK/$HOST.expected.finger"
+        openssl x509 -in "$WORK/$HOST.test" -fingerprint -noout > "$WORK/$HOST.real.finger"
+        if [ "$(cat "$WORK/$HOST.expected.finger")" != "$(cat "$WORK/$HOST.real.finger")" ]; then
+            echo -n "invalid certificate for $HOST"
+            FAIL=1
+            echo $HOST >> $WORK/bad
+        fi
+    fi
+    echo
+done
+}
+
+assemble_ca
+check
+
+rm -rf $CACERTS $WORK
+exit $FAIL