From 32563766ab38bce038e42c1b53e5e359369614bb Mon Sep 17 00:00:00 2001
From: Erich Eckner <git@eckner.net>
Date: Tue, 1 Dec 2020 09:13:20 +0100
Subject: crypt-expiry-check: learn how to download cert file before checking
 ("-r" / "REMOTEFILE")

---
 crypt-expiry-check.in | 41 +++++++++++++++++++++++++++++++++++++++--
 1 file changed, 39 insertions(+), 2 deletions(-)

diff --git a/crypt-expiry-check.in b/crypt-expiry-check.in
index 25988ce..3846d7f 100755
--- a/crypt-expiry-check.in
+++ b/crypt-expiry-check.in
@@ -303,6 +303,32 @@ check_server_status() {
     fi
 }
 
+#####################################################
+### Check the expiration status of a certificate file
+### on a remote location
+### Accepts three parameters:
+###  $1 -> certificate file to process
+###  $2 -> Server name
+###  $3 -> Port number of certificate
+#####################################################
+check_remote_file_status() {
+
+    CERTURL=${1}
+    HOST=${2}
+    PORT=${3}
+    FWARNDAYS=${4:-${WARNDAYS}}
+
+    if ! curl -so "${CERT_TMP}" "${CERTURL}"
+    then
+        >&2 echo "ERROR: Could not retrieve the certificate at '${CERTURL}'."
+        set_returncode 1
+        return
+    fi
+
+    check_file_status "${CERT_TMP}" "${HOST}" "${PORT}" "${FWARNDAYS}"
+
+}
+
 #####################################################
 ### Check the expiration status of a certificate file
 ### Accepts three parameters:
@@ -461,7 +487,7 @@ check_gpg_key_status() {
 #################################
 ### Start of main program
 #################################
-while getopts abc:e:f:g:G:hik:nqs:t:x:v:VZ option
+while getopts abc:e:f:g:G:hik:nqr:s:t:x:v:VZ option
 do
     case "${option}"
     in
@@ -500,6 +526,9 @@ do
         q)
             QUIET=true
             ;;
+        r)
+            REMOTECERTFILES[${#REMOTECERTFILES[@]}]=${OPTARG}
+            ;;
         s)
             HOSTS[${#HOSTS[@]}]=${OPTARG%:*}
             PORTS[${#PORTS[@]}]=${OPTARG#*:}
@@ -600,7 +629,7 @@ else
     exit 1
 fi
 
-if [ $[${#HOSTS[@]} + ${#SERVERFILES[@]} + ${#CERTFILES[@]} + ${#CHECKADDRESSES[@]}] -eq 0 ]
+if [ $[${#HOSTS[@]} + ${#SERVERFILES[@]} + ${#CERTFILES[@]} + ${#REMOTECERTFILES[@]} + ${#CHECKADDRESSES[@]}] -eq 0 ]
 then
     >&2 echo "ERROR: Nothing to check."
     usage
@@ -621,6 +650,9 @@ do
         if [ "${PORT}" = "FILE" ]
         then
             check_file_status "${HOST}" "FILE" "${HOST}" "${FWARNDAYS}"
+        elif [ "${PORT}" = "REMOTEFILE" ]
+        then
+            check_remote_file_status "${HOST}" "REMOTEFILE" "${HOST}" "${FWARNDAYS}"
         elif [ "${PORT}" = "GPG" ]
         then
             check_gpg_key_status "${GPG}" "${HOST}" "${FWARNDAYS}"
@@ -645,6 +677,11 @@ do
     check_file_status "${CERTFILES[${i}]}" "FILE"  "${CERTFILES[${i}]}"
 done
 
+for (( i=0; i<${#REMOTECERTFILES[@]}; i++ ))
+do
+    check_remote_file_status "${REMOTECERTFILES[${i}]}" "REMOTEFILE"  "${REMOTECERTFILES[${i}]}"
+done
+
 for (( i=0; i<${#CHECKADDRESSES[@]}; i++ ))
 do
     check_gpg_key_status "${CHECKADDRESSBINARIES[${i}]}" "${CHECKADDRESSES[${i}]}"
-- 
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