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Do we want to implement built-in row-level security? Currently, users have to define views and use stored functions. See here for example:
https://mariadb.com/resources/blog/protect-your-data-row-level-security-in-mariadb-10-0/
https://mariadb.com/resources/blog/protect-your-data-2-a-row-level-security-walkthrough-in-mariadb-10-0/
Competitors' Row-level Security Functionality
The competitor's row-level security options are outlined below.
PostgreSQL
PostgreSQL has had built-in row-level security since PostgreSQL 9.5. It is implemented via ALTER TABLE ... ENABLE ROW LEVEL SECURITY and the CREATE POLICY, ALTER POLICY, and DROP POLICY statements.
https://www.postgresql.org/docs/9.5/ddl-rowsecurity.html
i.e.:
CREATE TABLE accounts (manager text, company text, contact_email text);
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ALTER TABLE accounts ENABLE ROW LEVEL SECURITY;
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CREATE POLICY account_managers ON accounts TO managers
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USING (manager = current_user);
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Oracle Database
Oracle has also had built-in row-level security since Oracle Database 9i. It appears to be implemented as a set of built-in functions.
https://www.oracle.com/database/technologies/security/label-security.html
https://docs.oracle.com/database/121/OLSAG/intro.htm#OLSAG001
http://mohamednabeel.blogspot.com/2014/08/oracle-label-security-12c-quick-start.html
i.e.:
SQL> conn lbacsys/password@cdb1_pdb1
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Connected.
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SQL> BEGIN
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2 -- Create OLS Policy
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3 -- Notice that the default_options is set to no_control to disable the policy
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4 -- in order add labels to the existing data items
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5 SA_SYSDBA.CREATE_POLICY(
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6 policy_name => 'ols_pol1',
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7 column_name => 'lb_col',
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8 default_options => 'no_control'
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9 );
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10
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11 -- Create label component levels
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12 -- TOP_SECRET has the highest level of access
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13 SA_COMPONENTS.CREATE_LEVEL(
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14 policy_name => 'ols_pol1',
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15 level_num => 4,
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16 short_name => 'TS',
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17 long_name => 'top_secret'
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18 );
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19
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20
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21 SA_COMPONENTS.CREATE_LEVEL(
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22 policy_name => 'ols_pol1',
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23 level_num => 3,
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24 short_name => 'S',
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25 long_name => 'secret'
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26 );
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27
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28 SA_COMPONENTS.CREATE_LEVEL(
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29 policy_name => 'ols_pol1',
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30 level_num => 2,
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31 short_name => 'C',
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32 long_name => 'confidential'
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33 );
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34
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35 SA_COMPONENTS.CREATE_LEVEL(
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36 policy_name => 'ols_pol1',
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37 level_num => 1,
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38 short_name => 'UC',
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39 long_name => 'unclassified'
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40 );
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41
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42 -- Create data labels
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43 SA_LABEL_ADMIN.CREATE_LABEL(
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44 policy_name => 'ols_pol1',
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45 label_tag => 40,
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46 label_value => 'TS',
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47 data_label => TRUE
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48 );
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49
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50 SA_LABEL_ADMIN.CREATE_LABEL(
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51 policy_name => 'ols_pol1',
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52 label_tag => 30,
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53 label_value => 'S',
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54 data_label => TRUE
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55 );
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56
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57 SA_LABEL_ADMIN.CREATE_LABEL(
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58 policy_name => 'ols_pol1',
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59 label_tag => 20,
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60 label_value => 'C',
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61 data_label => TRUE
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62 );
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63
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64 SA_LABEL_ADMIN.CREATE_LABEL(
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65 policy_name => 'ols_pol1',
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66 label_tag => 10,
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67 label_value => 'UC',
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68 data_label => TRUE
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69 );
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70
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71 -- Apply access_pol policy on table gov.flight
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72 SA_POLICY_ADMIN.APPLY_TABLE_POLICY(
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73 policy_name => 'ols_pol1',
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74 schema_name => 'gov',
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75 table_name => 'flight',
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76 table_options => null,
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77 label_function => null,
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78 predicate => null
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79 );
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80
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81 -- Add user authorizations (i.e. clearance levels)
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82 SA_USER_ADMIN.SET_LEVELS(
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83 policy_name => 'ols_pol1',
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84 user_name => 'bob',
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85 max_level => 'S',
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86 min_level => 'UC',
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87 def_level => 'S',
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88 row_level => 'S'
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89 );
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90
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91 SA_USER_ADMIN.SET_LEVELS(
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92 policy_name => 'ols_pol1',
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93 user_name => 'tim',
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94 max_level => 'UC',
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95 min_level => 'UC',
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96 def_level => 'UC',
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97 row_level => 'UC'
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98 );
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99 END;
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100 /
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Microsoft SQL Server
Microsoft SQL Server has had built-in row-level security since SQL Server 2016. It is implemented via CREATE SECURITY POLICY, ALTER SECURITY POLICY, and the DROP SECURITY POLICY statements.
https://docs.microsoft.com/en-us/sql/relational-databases/security/row-level-security?view=sql-server-ver15
i.e.:
CREATE SECURITY POLICY rls.SecPol
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ADD FILTER PREDICATE rls.tenantAccessPredicate(TenantId) ON dbo.Sales,
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ADD BLOCK PREDICATE rls.tenantAccessPredicate(TenantId) ON dbo.Sales AFTER INSERT;
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