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revise *** Use models-as-data QL code directly (no graphical editor)

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Michael Hohn
2025-07-30 16:18:53 -07:00
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@@ -154,29 +154,30 @@
languages, making it possible to reuse modeling patterns from Java or Python
in C/C++ contexts.
*** TODO Use models-as-data QL code directly (no graphical editor).
summary
- The model definition files exist
- Data files exist
- There is no editor
- Generate YAML manually
*** Use models-as-data QL code directly (no graphical editor)
This section focuses on applying the models-as-data system without using the
graphical model editor. While model definition files and supporting data
already exist, we manually author YAML files for new models. This approach is
especially relevant for C, where graphical tooling is limited or nonexistent.
- Use the C version of the SQLite injection workshop as reinforcement.
1. Code: [[file:~/work-gh/codeql-lab/codeql-dataflow-sql-injection-c/add-user.c]]
2. Query: [[file:~/work-gh/codeql-lab/codeql-dataflow-sql-injection-c/SqlInjection.ql]]
- Apply models-as-data QL logic directly (no graphical editor).
1. [ ] Add model for: =count = read(STDIN_FILENO, buf, BUFSIZE);=
2. [ ] Add model for: =rc = sqlite3_exec(db, query, NULL, 0, &zErrMsg);=
3. [X] Reference Java version (structure only, not editor): [[file:~/work-gh/codeql-lab/codeql-sqlite-java/README.org::*Using sqlite to illustrate models-as-data][Using sqlite to illustrate models-as-data]]
4. [ ] C-specific walkthrough: [[file:~/work-gh/codeql-lab/codeql-dataflow-sql-injection-c/README.org::*Using sqlite to illustrate models-as-data][Using sqlite to illustrate models-as-data]]
- Manually define YAML models for standard functions (e.g., =read=) and test propagation via QL.
As reinforcement, we use the C version of the SQLite injection workshop:
- The code sample is at [[file:~/work-gh/codeql-lab/codeql-dataflow-sql-injection-c/add-user.c]].
- The accompanying query is [[file:~/work-gh/codeql-lab/codeql-dataflow-sql-injection-c/SqlInjection.ql]].
- customizations using models-as-data, via text
- continue with codeql-dataflow-sql-injection-c
- The ./ql/cpp/ql/src/Security/CWE/CWE-089/SqlTainted.ql query works out of
the box
- Add =char* get_user_info()= as extra source for illustration
We extend this example by modeling key functions manually:
- Add a source model for =count = read(STDIN_FILENO, buf, BUFSIZE);=
- Add a sink model for =rc = sqlite3_exec(db, query, NULL, 0, &zErrMsg);=
For reference, see the Java version’s structure (but not the graphical
editor): [[file:~/work-gh/codeql-lab/codeql-sqlite-java/README.org::*Using sqlite to illustrate models-as-data][Using sqlite to illustrate models-as-data]], and the corresponding
C-specific walkthrough: [[file:~/work-gh/codeql-lab/codeql-dataflow-sql-injection-c/README.org::*Using sqlite to illustrate models-as-data][Using sqlite to illustrate models-as-data]].
We demonstrate how to define YAML-based models for standard functions like
=read()= and verify their effect using the out-of-the-box query
[[./ql/cpp/ql/src/Security/CWE/CWE-089/SqlTainted.ql][SqlTainted.ql]]. As an additional example, we introduce the higher-level,
redundant =char* get_user_info()= as a custom source—even though it internally
calls a function already modeled as a source—to illustrate how user-defined
extensions propagate through the query logic.
** TODO codeql-bundling