issue_comments: 813113175
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| html_url | issue_url | id | node_id | user | created_at | updated_at | author_association | body | reactions | issue | performed_via_github_app |
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| https://github.com/simonw/datasette/issues/1293#issuecomment-813113175 | https://api.github.com/repos/simonw/datasette/issues/1293 | 813113175 | MDEyOklzc3VlQ29tbWVudDgxMzExMzE3NQ== | 9599 | 2021-04-04T23:07:01Z | 2021-04-04T23:07:01Z | OWNER | A more promising route I found involved the `db.set_authorizer` method. This can be used to log the permission checks that SQLite uses, including checks for permission to access specific columns of specific tables. For a while I thought this could work! ```pycon >>> def print_args(*args, **kwargs): ... print("args", args, "kwargs", kwargs) ... return sqlite3.SQLITE_OK >>> db = sqlite3.connect("fixtures.db") >>> db.execute('select * from compound_primary_key join facetable on rowid').fetchall() args (21, None, None, None, None) kwargs {} args (20, 'compound_primary_key', 'pk1', 'main', None) kwargs {} args (20, 'compound_primary_key', 'pk2', 'main', None) kwargs {} args (20, 'compound_primary_key', 'content', 'main', None) kwargs {} args (20, 'facetable', 'pk', 'main', None) kwargs {} args (20, 'facetable', 'created', 'main', None) kwargs {} args (20, 'facetable', 'planet_int', 'main', None) kwargs {} args (20, 'facetable', 'on_earth', 'main', None) kwargs {} args (20, 'facetable', 'state', 'main', None) kwargs {} args (20, 'facetable', 'city_id', 'main', None) kwargs {} args (20, 'facetable', 'neighborhood', 'main', None) kwargs {} args (20, 'facetable', 'tags', 'main', None) kwargs {} args (20, 'facetable', 'complex_array', 'main', None) kwargs {} args (20, 'facetable', 'distinct_some_null', 'main', None) kwargs {} ``` Those `20` values (where 20 is `SQLITE_READ`) looked like they were checking permissions for the columns in the order they would be returned! Then I found a snag: ```pycon In [18]: db.execute('select 1 + 1 + (select max(rowid) from facetable)') args (21, None, None, None, None) kwargs {} args (31, None, 'max', None, None) kwargs {} args (20, 'facetable', 'pk', 'main', None) kwargs {} args (21, None, None, None, None) kwargs {} args (20, 'facetable', '', None, None) kwargs {} ``` Once a subselect is involved the order of the `20` checks no longer matches the order in which the columns are returned from the query. | {"total_count": 0, "+1": 0, "-1": 0, "laugh": 0, "hooray": 0, "confused": 0, "heart": 0, "rocket": 0, "eyes": 0} | 849978964 |