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  • simonw · 4 ✖

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  • Protect against malicious SQL that causes damage even though our DB is immutable · 4 ✖

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id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions issue performed_via_github_app
340787868 https://github.com/simonw/datasette/issues/39#issuecomment-340787868 https://api.github.com/repos/simonw/datasette/issues/39 MDEyOklzc3VlQ29tbWVudDM0MDc4Nzg2OA== simonw 9599 2017-10-31T14:54:14Z 2017-10-31T14:54:14Z OWNER

Here’s how I can (I think) provide safe execution of arbitrary SQL while blocking PRAGMA calls: let people use names parameters in their SQL and apply strict filtering to the SQL query but not to the parameter values.

cur.execute(
    "select * from people where name_last=:who and age=:age", {
        "who": who,
        "age": age
})

In URL form:

?sql=select...&who=Terry&age=34

Now we can apply strict, dumb validation rules to the SQL part while allowing anything in the named queries - so people can execute a search for PRAGMA without being able to execute a PRAGMA statement.

 
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 Protect against malicious SQL that causes damage even though our DB is immutable 268469569  
339510770 https://github.com/simonw/datasette/issues/39#issuecomment-339510770 https://api.github.com/repos/simonw/datasette/issues/39 MDEyOklzc3VlQ29tbWVudDMzOTUxMDc3MA== simonw 9599 2017-10-26T00:07:40Z 2017-10-26T00:07:40Z OWNER

It looks like I should double quote my columns and ensure they are correctly escaped https://blog.christosoft.de/2012/10/sqlite-escaping-table-acolumn-names/ - hopefully using ? placeholders for column names will work. I should use ? for tables too.

 
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 Protect against malicious SQL that causes damage even though our DB is immutable 268469569  
339413825 https://github.com/simonw/datasette/issues/39#issuecomment-339413825 https://api.github.com/repos/simonw/datasette/issues/39 MDEyOklzc3VlQ29tbWVudDMzOTQxMzgyNQ== simonw 9599 2017-10-25T17:48:48Z 2017-10-25T17:48:48Z OWNER

Could I use https://sqlparse.readthedocs.io/en/latest/ to parse incoming statements and ensure they are pure SELECTs? Would that prevent people from using a compound SELECT statement to trigger an evil PRAGMA of some sort?

 
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 Protect against malicious SQL that causes damage even though our DB is immutable 268469569  
339406634 https://github.com/simonw/datasette/issues/39#issuecomment-339406634 https://api.github.com/repos/simonw/datasette/issues/39 MDEyOklzc3VlQ29tbWVudDMzOTQwNjYzNA== simonw 9599 2017-10-25T17:27:10Z 2017-10-25T17:27:10Z OWNER

It certainly looks like some of the stuff in https://sqlite.org/pragma.html could be used to screw around with things. Example: PRAGMA case_sensitive_like = 1 - would that affect future queries?

 
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 Protect against malicious SQL that causes damage even though our DB is immutable 268469569  

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