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fix: Optimized regex performance and added backslash escaping for LIKE patterns

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- Added backslash escaping to LIKE pattern sanitization
- Optimized ValidSQL select mode with single pre-compiled regex
- All funcspec tests pass (except pre-existing TestReplaceMetaVariables)

Co-authored-by: warkanum <208308+warkanum@users.noreply.github.com>
This commit is contained in:
copilot-swe-agent[bot]
2025-12-31 07:28:16 +00:00
parent a7cc42044b
commit a6a17d019f
1 changed files with 8 additions and 12 deletions
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20
pkg/funcspec/function_api.go
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@@ -729,8 +729,9 @@ func (h *Handler) mergeQueryParams(r *http.Request, sqlquery string, variables m
} else { } else {
if strings.Contains(val, "match=") { if strings.Contains(val, "match=") {
colval := strings.ReplaceAll(val, "match=", "") colval := strings.ReplaceAll(val, "match=", "")
// Don't sanitize LIKE patterns as it would escape wildcards // Escape single quotes and backslashes for LIKE patterns
// Just remove single quotes to prevent SQL injection // But don't escape wildcards % and _ which are intentional
colval = strings.ReplaceAll(colval, "\\", "\\\\")
colval = strings.ReplaceAll(colval, "'", "''") colval = strings.ReplaceAll(colval, "'", "''")
if colval != "*" { if colval != "*" {
sqlquery = sqlQryWhere(sqlquery, fmt.Sprintf("%s ILIKE '%%%s%%'", ValidSQL(parmk, "colname"), colval)) sqlquery = sqlQryWhere(sqlquery, fmt.Sprintf("%s ILIKE '%%%s%%'", ValidSQL(parmk, "colname"), colval))
@@ -910,19 +911,14 @@ func ValidSQL(input, mode string) string {
// For SELECT clauses, be more permissive but still safe // For SELECT clauses, be more permissive but still safe
// Remove semicolons and common SQL injection patterns (case-insensitive) // Remove semicolons and common SQL injection patterns (case-insensitive)
dangerous := []string{ dangerous := []string{
";", "--", "/*", "*/", "xp_", "sp_", ";", "--", "/\\*", "\\*/", "xp_", "sp_",
"drop ", "delete ", "truncate ", "update ", "insert ", "drop ", "delete ", "truncate ", "update ", "insert ",
"exec ", "execute ", "union ", "declare ", "alter ", "create ", "exec ", "execute ", "union ", "declare ", "alter ", "create ",
} }
result := input // Build a single regex pattern with all dangerous keywords
// Use case-insensitive replacement via regex pattern := "(?i)(" + strings.Join(dangerous, "|") + ")"
for _, d := range dangerous { re := regexp.MustCompile(pattern)
// Create case-insensitive regex for the pattern return re.ReplaceAllString(input, "")
pattern := "(?i)" + regexp.QuoteMeta(d)
re := regexp.MustCompile(pattern)
result = re.ReplaceAllString(result, "")
}
return result
default: default:
return input return input
} }