QuecManager non-beta

Its about time I did this!

ipk-source/sdxpinn-quecmanager/root/www/cgi-bin/quecmanager/auth.sh

@@ -0,0 +1,62 @@
+#!/bin/sh
+
+# Set Content-Type for CGI script
+echo "Content-type: application/json"
+echo ""
+
+# Read POST data
+read -r POST_DATA
+
+# Debug log for generated hash
+DEBUG_LOG="/tmp/auth.log"
+
+# Extract the password from POST data (URL encoded)
+USER="root"
+INPUT_PASSWORD=$(echo "$POST_DATA" | grep -o 'password=[^&]*' | cut -d= -f2-)
+
+# URL-decode the password while preserving most special characters
+# First decode percent-encoded sequences
+urldecode() {
+    local encoded="${1//+/ }"
+    printf '%b' "${encoded//%/\\x}"
+}
+
+# Decode the password
+INPUT_PASSWORD=$(urldecode "$INPUT_PASSWORD")
+
+# Basic validation to reject & and $ characters
+if echo "$INPUT_PASSWORD" | grep -q '[&$]'; then
+    echo '{"state":"failed", "message":"Password contains forbidden characters (& or $)"}'
+    exit 1
+fi
+
+# Sanitize the password for shell usage
+INPUT_PASSWORD=$(printf '%s' "$INPUT_PASSWORD" | sed 's/[\"]/\\&/g')
+
+# Extract the hashed password from /etc/shadow for the specified user
+USER_SHADOW_ENTRY=$(grep "^$USER:" /etc/shadow)
+
+if [ -z "$USER_SHADOW_ENTRY" ]; then
+    echo '{"state":"failed", "message":"User not found"}'
+    exit 1
+fi
+
+# Extract the password hash (it's the second field, colon-separated)
+USER_HASH=$(echo "$USER_SHADOW_ENTRY" | cut -d: -f2)
+
+# Extract the salt (MD5 uses the $1$ prefix followed by the salt)
+SALT=$(echo "$USER_HASH" | cut -d'$' -f3)
+
+# Generate a hash from the input password using the same salt
+# Use printf to avoid issues with special characters in echo
+GENERATED_HASH=$(printf '%s' "$INPUT_PASSWORD" | openssl passwd -1 -salt "$SALT" -stdin)
+
+# Log generated hash for debugging
+printf "Generated hash: %s\n" "$GENERATED_HASH" >> "$DEBUG_LOG"
+
+# Compare the generated hash with the one in the shadow file
+if [ "$GENERATED_HASH" = "$USER_HASH" ]; then
+    echo '{"state":"success"}'
+else
+    echo '{"state":"failed", "message":"Authentication failed"}'
+fi