Add sorting of the processed key lines so that "good" keys are output

at the end.  This is done so that they take precedence over "bad" when
being processed in key files.  If bad keys are processed after good
keys, there is a possibility of malicious bad key causing good keys to
be continually removed from key files, which would be a big nuisance.

1 files changed, 6 insertions, 4 deletions

diff --git a/src/common b/src/common
index 9c76bd1..17955a7 100644
--- a/src/common
+++ b/src/common
@@ -484,7 +484,10 @@ process_user_id() {
 		fi
 		;;
 	esac
-    done
+    done | sort -t: -k1 -n -r
+    # NOTE: this last sort is important so that the "good" keys (key
+    # flag '0') come last.  This is so that they take precedence when
+    # being processed in the key files over "bad" keys (key flag '1')
 }
 
 # process a single host in the known_host file
@@ -498,16 +501,15 @@ process_host_known_hosts() {
     local tmpfile
 
     host="$1"
+    userID="ssh://${host}"
 
     log "processing: $host"
 
-    userID="ssh://${host}"
-
     nKeys=0
     nKeysOK=0
 
     IFS=$'\n'
-    for line in $(process_user_id "ssh://${host}") ; do
+    for line in $(process_user_id "${userID}") ; do
 	# note that key was found
 	nKeys=$((nKeys+1))