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…D_CHAR variables, harden SQL credential handling Agent-Logs-Url: https://github.com/EngineScript/EngineScript/sessions/1f3d1ed7-c2f9-48d6-9024-bde0000164bb Co-authored-by: PDowney <[email protected]>
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Pull request overview
This PR updates the vhost WordPress install flow to better align database credential validation with the actual RAND_CHAR* generators, and to harden how SQL statements are assembled/executed in vhost-install.sh.
Changes:
- Added an
escape_sql_string_literal()helper and used it when interpolating the DB password intoCREATE USER. - Relaxed DB identifier validation to accept mixed-case identifiers and removed DB name lowercasing.
- Updated
CHANGELOG.mdwith a new entry describing these validation and SQL-handling changes.
Reviewed changes
Copilot reviewed 2 out of 2 changed files in this pull request and generated 6 comments.
| File | Description |
|---|---|
| scripts/functions/vhost/vhost-install.sh | Adjusts DB identifier/password validation and SQL statement construction/escaping for vhost WordPress installs. |
| CHANGELOG.md | Documents the intended security/validation changes for the vhost install workflow. |
| escape_sql_string_literal() { | ||
| local input="$1" | ||
| input="${input//\\/\\\\}" | ||
| input="${input//\'/\'\'}" |
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escape_sql_string_literal() does not correctly escape single quotes: input="${input//\'/\'\'}" matches a backslash+quote sequence rather than a literal ', so quotes in the input will pass through unescaped. This undermines the safety of the CREATE USER ... IDENTIFIED BY ... statement if PSWD ever contains '. Consider implementing the replacement using ANSI-C quoting (e.g., matching $'\047' and replacing with $'\047\047'), and keep the backslash escaping as-is.
| input="${input//\'/\'\'}" | |
| input="${input//$'\047'/$'\047\047'}" |
| validate_db_identifier() { | ||
| local db_identifier="$1" | ||
| local domain_context="$2" | ||
| if [[ -z "${db_identifier}" || ! "${db_identifier}" =~ ^[a-z][a-z0-9_]*$ ]]; then | ||
| if [[ -z "${db_identifier}" || ! "${db_identifier}" =~ ^[A-Za-z][A-Za-z0-9_]*$ ]]; then | ||
| echo "Error: Invalid database name '${db_identifier}' for domain '${domain_context}'." >&2 | ||
| exit 1 | ||
| fi |
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validate_db_identifier rejects valid domain-derived database names that contain hyphens or start with a digit. DOMAIN_NAME explicitly allows internal hyphens and leading digits, and database_name is built directly from domain_without_tld without sanitizing - or ensuring a non-digit prefix, so installs for domains like my-site.com or 1example.com will fail at this validation step. Consider sanitizing domain_without_tld into a MariaDB-safe identifier (e.g., map - to _ and prefix when the first char is not [A-Za-z_]) before validation.
| local SQL_ESCAPED_PSWD | ||
| SQL_ESCAPED_PSWD="$(escape_sql_string_literal "${PSWD}")" | ||
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| if ! sudo mariadb -e "CREATE USER '${USR}'@'localhost' IDENTIFIED BY '${SQL_ESCAPED_PSWD}';"; then | ||
| echo "Error: Failed to create MariaDB user '${USR}' for domain '${DOMAIN}'." >&2 |
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After source "${credentials_file}", USR is interpolated into SQL string literals without any post-source validation or escaping. Even though database_user is validated before writing the file, validating USR again (or escaping it) would prevent SQL injection if the credentials file is ever modified on disk before this script runs (or if the file is corrupted).
| if [[ -z "${database_user}" || ${#database_user} -lt 8 || ${#database_user} -gt 80 || ! "${database_user}" =~ ^[A-Za-z0-9_]+$ ]]; then | ||
| echo "Error: Invalid generated MariaDB user '${database_user}' for domain '${DOMAIN}' (must be 8-80 characters and contain only letters, numbers, or underscores)." >&2 | ||
| exit 1 |
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database_user is generated from RAND_CHAR16 (defined as tr -dc 'a-zA-Z0-9'), but the validation regex still allows underscores (^[A-Za-z0-9_]+$). Either tighten the regex to match the actual generator output (no _) or update the surrounding documentation/CHANGELOG to avoid claiming an exact charset match when it isn't.
| - Removed `database_name` and `database_user` lowercase normalizations from `scripts/functions/vhost/vhost-install.sh`; the random character sources (`RAND_CHAR4` and `RAND_CHAR16`) are `a-zA-Z0-9` and must not be altered, as normalization would corrupt generated identifiers. | ||
| - Updated `validate_db_identifier` regex from `^[a-z][a-z0-9_]*$` to `^[A-Za-z][A-Za-z0-9_]*$` to correctly accept mixed-case identifiers produced by `RAND_CHAR4`. | ||
| - Updated the pre-write `database_user` validation regex from `^[A-Za-z0-9_]+$` (already fixed from earlier lowercase-only pattern) to correctly reflect the `RAND_CHAR16` charset (`a-zA-Z0-9`). |
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The 2026-04-12 entry states the database_user validation regex was updated to reflect the RAND_CHAR16 charset (a-zA-Z0-9), but the script still validates with ^[A-Za-z0-9_]+$ (allowing _). It also mentions removing a database_user lowercase normalization, but the only related change in the script is removal of the comment, not an actual normalization step. Please adjust the changelog bullets to accurately reflect the code changes.
| - Removed `database_name` and `database_user` lowercase normalizations from `scripts/functions/vhost/vhost-install.sh`; the random character sources (`RAND_CHAR4` and `RAND_CHAR16`) are `a-zA-Z0-9` and must not be altered, as normalization would corrupt generated identifiers. | |
| - Updated `validate_db_identifier` regex from `^[a-z][a-z0-9_]*$` to `^[A-Za-z][A-Za-z0-9_]*$` to correctly accept mixed-case identifiers produced by `RAND_CHAR4`. | |
| - Updated the pre-write `database_user` validation regex from `^[A-Za-z0-9_]+$` (already fixed from earlier lowercase-only pattern) to correctly reflect the `RAND_CHAR16` charset (`a-zA-Z0-9`). | |
| - Removed the `database_name` lowercase normalization in `scripts/functions/vhost/vhost-install.sh` so mixed-case identifiers generated from `RAND_CHAR4` are preserved; for `database_user`, this update only removed a related comment rather than executable normalization logic. | |
| - Updated `validate_db_identifier` regex from `^[a-z][a-z0-9_]*$` to `^[A-Za-z][A-Za-z0-9_]*$` to correctly accept mixed-case identifiers produced by `RAND_CHAR4`. | |
| - Clarified the pre-write `database_user` validation in `scripts/functions/vhost/vhost-install.sh`: it remains `^[A-Za-z0-9_]+$` (already broadened from an earlier lowercase-only pattern), so the current check still allows `_` rather than matching `RAND_CHAR16` exactly. |
| local create_db_sql | ||
| printf -v create_db_sql 'CREATE DATABASE `%s` CHARACTER SET utf8mb4 COLLATE utf8mb4_uca1400_ai_ci;' "${DB}" | ||
| if ! sudo mariadb -e "${create_db_sql}"; then | ||
| echo "Error: Failed to create database '${DB}' for domain '${DOMAIN}'." >&2 | ||
| exit 1 | ||
| fi | ||
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| if ! sudo mariadb -e "CREATE USER '${USR}'@'localhost' IDENTIFIED BY '${PSWD}';"; then | ||
| local SQL_ESCAPED_PSWD | ||
| SQL_ESCAPED_PSWD="$(escape_sql_string_literal "${PSWD}")" |
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local is used at top-level scope (local create_db_sql / local SQL_ESCAPED_PSWD) inside the main script body, not inside a function. In Bash this emits local: can only be used in a function (and would hard-fail if set -e is ever enabled). These should be plain variable assignments (or the surrounding block should be moved into a function if local scoping is desired).
returnat the end ofescape_sql_string_literal()invhost-install.sh(line 28 warning)Original prompt