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fix(generic): escape SQL identifiers and literals in metadata/DDL paths (#1914)#2199

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OtterMind:mainfrom
HandSonic:fix/sqli2-generic
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fix(generic): escape SQL identifiers and literals in metadata/DDL paths (#1914)#2199
HandSonic wants to merge 3 commits into
OtterMind:mainfrom
HandSonic:fix/sqli2-generic

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Part of the SQL-injection hardening tracked in #1914. Prior art: #2052 (Oracle), #2053 (SQL Server), and the wave-1 batch (#2172-#2177).

These are second-order injection paths: values such as table/schema/view/index names originate from the connected database's own metadata, so exploitation requires a maliciously named object in a target database.

What changed (2 sites)

Template-driven fix: sanitizeTemplateValue inspects each generic.json placeholder — quoted-literal positions get quote doubling, bare-identifier positions get strict whitelist. Covers DuckDB/TDengine dialects.

Verification

mvn -B -pl chat2db-community-plugins/chat2db-community-generic -f chat2db-community-server/pom.xml -Dmaven.test.skip=false -DskipTests=false -Dsurefire.includes=**/*Test.java -Dsurefire.failIfNoSpecifiedTests=false -Dmaven.test.failure.ignore=false test

Result: Tests run: 10, Failures: 0, Errors: 0, Skipped: 0.

This branch also passed a two-lens adversarial review (escape-correctness/coverage + regression/test-efficacy); all blocking findings were fixed and re-tested before submission.

…maintainer review (OtterMind#1914)

- new GenericIdentifierProcessor (SPI ISQLIdentifierProcessor): quoteIdentifier
  with double-quote default + dialect-parameterized char variant, escapeString
  with single-quote doubling
- GenericMetaData overrides getSQLIdentifierProcessor()
- template-aware validation moved to GenericSqlGuards (sanitizeTemplateValue,
  requireSafeIdentifier AS-IS), escaping delegated to the processor
- GenericSqlEscapes removed; tests migrated (12 green)
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