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MathiasVPMathiasVP
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C++: Make the new SQL abstract classes extend 'Function' instead. This is more in line with how we model RemoteFlowFunction.
1 parent 90fe5c5 commit 90633b9

9 files changed

Lines changed: 167 additions & 166 deletions

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‎cpp/ql/src/Security/CWE/CWE-089/SqlTainted.ql‎

Lines changed: 3 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -16,7 +16,6 @@ import cpp
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import semmle.code.cpp.security.Security
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import semmle.code.cpp.security.FunctionWithWrappers
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import semmle.code.cpp.security.TaintTracking
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import semmle.code.cpp.security.Sql
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import TaintedWithPath
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class SQLLikeFunction extends FunctionWithWrappers {
@@ -35,10 +34,10 @@ class Configuration extends TaintTrackingConfiguration {
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or
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e.getUnspecifiedType() instanceof IntegralType
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or
38-
exists(SqlFunctionality sql, int arg, Function func, FunctionInput input |
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e = func.getACallToThisFunction().getArgument(arg) and
37+
exists(SqlBarrier sqlFunc, int arg, FunctionInput input |
38+
e = sqlFunc.getACallToThisFunction().getArgument(arg) and
4039
input.isParameterDeref(arg) and
41-
sql.getAnEscapedParameter(func, input, _)
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sqlFunc.getAnEscapedParameter(input, _)
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)
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}
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}

‎cpp/ql/src/semmle/code/cpp/models/Models.qll‎

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Original file line numberDiff line numberDiff line change
@@ -33,3 +33,6 @@ private import implementations.Recv
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private import implementations.Accept
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private import implementations.Poll
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private import implementations.Select
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private import implementations.MySql
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private import implementations.SqLite3
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private import implementations.PostgreSql

‎cpp/ql/src/semmle/code/cpp/models/implementations/MySql.qll‎

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,8 @@
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private import semmle.code.cpp.models.interfaces.Sql
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private import semmle.code.cpp.models.interfaces.FunctionInputsAndOutputs
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private class MySqlSink extends SqlSink {
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MySqlSink() { this.hasName(["mysql_query", "mysql_real_query"]) }
6+
7+
override predicate getAnSqlParameter(FunctionInput input) { input.isParameterDeref(1) }
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}

‎cpp/ql/src/semmle/code/cpp/models/implementations/PostgreSql.qll‎

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,93 @@
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private import semmle.code.cpp.models.interfaces.Sql
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private import semmle.code.cpp.models.interfaces.FunctionInputsAndOutputs
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private predicate pqxxTransactionSqlArgument(string function, int arg) {
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function = "exec" and arg = 0
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or
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function = "exec0" and arg = 0
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or
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function = "exec1" and arg = 0
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or
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function = "exec_n" and arg = 1
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or
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function = "exec_params" and arg = 0
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or
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function = "exec_params0" and arg = 0
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or
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function = "exec_params1" and arg = 0
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or
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function = "exec_params_n" and arg = 1
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or
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function = "query_value" and arg = 0
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or
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function = "stream" and arg = 0
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}
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private predicate pqxxConnectionSqlArgument(string function, int arg) {
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function = "prepare" and arg = 1
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}
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private predicate pqxxTransationClassNames(string className, string namespace) {
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namespace = "pqxx" and
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className in [
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"dbtransaction", "nontransaction", "basic_robusttransaction", "robusttransaction",
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"subtransaction", "transaction", "basic_transaction", "transaction_base", "work"
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]
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}
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private predicate pqxxConnectionClassNames(string className, string namespace) {
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namespace = "pqxx" and
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className in ["connection_base", "basic_connection", "connection"]
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}
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private predicate pqxxEscapeArgument(string function, int arg) {
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arg = 0 and
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function in ["esc", "esc_raw", "quote", "quote_raw", "quote_name", "quote_table", "esc_like"]
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}
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private class PostgreSqlSink extends SqlSink {
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PostgreSqlSink() {
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exists(Class c |
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this.getDeclaringType() = c and
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// transaction exec and connection prepare variations
53+
(
54+
pqxxTransationClassNames(c.getName(), c.getNamespace().getName()) and
55+
pqxxTransactionSqlArgument(this.getName(), _)
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or
57+
pqxxConnectionSqlArgument(this.getName(), _) and
58+
pqxxConnectionClassNames(c.getName(), c.getNamespace().getName())
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)
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)
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}
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override predicate getAnSqlParameter(FunctionInput input) {
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exists(int argIndex |
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pqxxTransactionSqlArgument(this.getName(), argIndex)
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or
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pqxxConnectionSqlArgument(this.getName(), argIndex)
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|
69+
input.isParameterDeref(argIndex)
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)
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}
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}
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private class PostgreSqlBarrier extends SqlBarrier {
75+
PostgreSqlBarrier() {
76+
exists(Class c |
77+
this.getDeclaringType() = c and
78+
// transaction and connection escape functions
79+
(
80+
pqxxTransationClassNames(c.getName(), c.getNamespace().getName()) or
81+
pqxxConnectionClassNames(c.getName(), c.getNamespace().getName())
82+
) and
83+
pqxxEscapeArgument(this.getName(), _)
84+
)
85+
}
86+
87+
override predicate getAnEscapedParameter(FunctionInput input, FunctionOutput output) {
88+
exists(int argIndex |
89+
input.isParameterDeref(argIndex) and
90+
output.isReturnValueDeref()
91+
)
92+
}
93+
}

‎cpp/ql/src/semmle/code/cpp/models/implementations/SqLite3.qll‎

Lines changed: 8 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,8 @@
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private import semmle.code.cpp.models.interfaces.Sql
2+
private import semmle.code.cpp.models.interfaces.FunctionInputsAndOutputs
3+
4+
private class SqLite3Sink extends SqlSink {
5+
SqLite3Sink() { this.hasName("sqlite3_exec") }
6+
7+
override predicate getAnSqlParameter(FunctionInput input) { input.isParameterDeref(1) }
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}

‎cpp/ql/src/semmle/code/cpp/models/interfaces/Sql.qll‎

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,30 @@
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/**
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* Provides abstract classes for modeling functions that execute and escape SQL query strings.
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* To use this QL library, create a QL class extending `SqlSink` or `SqlBarrier` with a
4+
* characteristic predicate that selects the function or set of functions you are modeling.
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* Within that class, override the predicates provided by the class to match the way a
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* parameter flows into the function and, in the case of `SqlBarrier`, out of the function.
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*/
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9+
private import cpp
10+
11+
/**
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* An abstract class that represents a function that executes an SQL query.
13+
*/
14+
abstract class SqlSink extends Function {
15+
/**
16+
* Holds if `input` to this function represents data that is passed to an SQL server.
17+
*/
18+
abstract predicate getAnSqlParameter(FunctionInput input);
19+
}
20+
21+
/**
22+
* An abstract class that represents a function that escapes an SQL query string.
23+
*/
24+
abstract class SqlBarrier extends Function {
25+
/**
26+
* Holds if the `output` escapes the SQL input `input` such that is it safe to pass to
27+
* an `SqlSink`.
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*/
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abstract predicate getAnEscapedParameter(FunctionInput input, FunctionOutput output);
30+
}

‎cpp/ql/src/semmle/code/cpp/security/Security.qll‎

Lines changed: 4 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@ import semmle.code.cpp.exprs.Expr
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import semmle.code.cpp.commons.Environment
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import semmle.code.cpp.security.SecurityOptions
99
import semmle.code.cpp.models.interfaces.FlowSource
10-
private import Sql
10+
import semmle.code.cpp.models.interfaces.Sql
1111

1212
/**
1313
* Extend this class to customize the security queries for
@@ -35,10 +35,10 @@ class SecurityOptions extends string {
3535
* An argument to a function that is passed to a SQL server.
3636
*/
3737
predicate sqlArgument(string function, int arg) {
38-
exists(Function func, FunctionInput input, SqlFunctionality sql |
39-
func.hasName(function) and
38+
exists(FunctionInput input, SqlSink sqlSink |
39+
sqlSink.hasName(function) and
4040
input.isParameterDeref(arg) and
41-
sql.getAnSqlParameter(func, input)
41+
sqlSink.getAnSqlParameter(input)
4242
)
4343
}
4444

‎cpp/ql/src/semmle/code/cpp/security/Sql.qll‎

Lines changed: 0 additions & 140 deletions
This file was deleted.

‎cpp/ql/test/query-tests/Security/CWE/CWE-089/SqlTainted/SqlTainted.expected‎

Lines changed: 18 additions & 18 deletions
Original file line numberDiff line numberDiff line change
@@ -5,14 +5,14 @@ edges
55
| test.c:15:20:15:23 | argv | test.c:21:18:21:23 | query1 |
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| test.c:15:20:15:23 | argv | test.c:21:18:21:23 | query1 indirection |
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| test.c:15:20:15:23 | argv | test.c:21:18:21:23 | query1 indirection |
8-
| test.cpp:44:27:44:30 | argv | test.cpp:44:27:44:33 | (const char *)... |
9-
| test.cpp:44:27:44:30 | argv | test.cpp:44:27:44:33 | (const char *)... |
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| test.cpp:44:27:44:30 | argv | test.cpp:44:27:44:33 | access to array |
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| test.cpp:44:27:44:30 | argv | test.cpp:44:27:44:33 | access to array |
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| test.cpp:44:27:44:30 | argv | test.cpp:44:27:44:33 | access to array |
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| test.cpp:44:27:44:30 | argv | test.cpp:44:27:44:33 | access to array |
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| test.cpp:44:27:44:30 | argv | test.cpp:44:27:44:33 | access to array indirection |
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| test.cpp:44:27:44:30 | argv | test.cpp:44:27:44:33 | access to array indirection |
8+
| test.cpp:43:27:43:30 | argv | test.cpp:43:27:43:33 | (const char *)... |
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| test.cpp:43:27:43:30 | argv | test.cpp:43:27:43:33 | (const char *)... |
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| test.cpp:43:27:43:30 | argv | test.cpp:43:27:43:33 | access to array |
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| test.cpp:43:27:43:30 | argv | test.cpp:43:27:43:33 | access to array |
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| test.cpp:43:27:43:30 | argv | test.cpp:43:27:43:33 | access to array |
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| test.cpp:43:27:43:30 | argv | test.cpp:43:27:43:33 | access to array |
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| test.cpp:43:27:43:30 | argv | test.cpp:43:27:43:33 | access to array indirection |
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| test.cpp:43:27:43:30 | argv | test.cpp:43:27:43:33 | access to array indirection |
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nodes
1717
| test.c:15:20:15:23 | argv | semmle.label | argv |
1818
| test.c:15:20:15:23 | argv | semmle.label | argv |
@@ -21,15 +21,15 @@ nodes
2121
| test.c:21:18:21:23 | query1 | semmle.label | query1 |
2222
| test.c:21:18:21:23 | query1 indirection | semmle.label | query1 indirection |
2323
| test.c:21:18:21:23 | query1 indirection | semmle.label | query1 indirection |
24-
| test.cpp:44:27:44:30 | argv | semmle.label | argv |
25-
| test.cpp:44:27:44:30 | argv | semmle.label | argv |
26-
| test.cpp:44:27:44:33 | (const char *)... | semmle.label | (const char *)... |
27-
| test.cpp:44:27:44:33 | (const char *)... | semmle.label | (const char *)... |
28-
| test.cpp:44:27:44:33 | access to array | semmle.label | access to array |
29-
| test.cpp:44:27:44:33 | access to array | semmle.label | access to array |
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| test.cpp:44:27:44:33 | access to array | semmle.label | access to array |
31-
| test.cpp:44:27:44:33 | access to array indirection | semmle.label | access to array indirection |
32-
| test.cpp:44:27:44:33 | access to array indirection | semmle.label | access to array indirection |
24+
| test.cpp:43:27:43:30 | argv | semmle.label | argv |
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| test.cpp:43:27:43:30 | argv | semmle.label | argv |
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| test.cpp:43:27:43:33 | (const char *)... | semmle.label | (const char *)... |
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| test.cpp:43:27:43:33 | (const char *)... | semmle.label | (const char *)... |
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| test.cpp:43:27:43:33 | access to array | semmle.label | access to array |
29+
| test.cpp:43:27:43:33 | access to array | semmle.label | access to array |
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| test.cpp:43:27:43:33 | access to array | semmle.label | access to array |
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| test.cpp:43:27:43:33 | access to array indirection | semmle.label | access to array indirection |
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| test.cpp:43:27:43:33 | access to array indirection | semmle.label | access to array indirection |
3333
#select
3434
| test.c:21:18:21:23 | query1 | test.c:15:20:15:23 | argv | test.c:21:18:21:23 | query1 | This argument to a SQL query function is derived from $@ and then passed to mysql_query(sqlArg) | test.c:15:20:15:23 | argv | user input (argv) |
35-
| test.cpp:44:27:44:33 | access to array | test.cpp:44:27:44:30 | argv | test.cpp:44:27:44:33 | access to array | This argument to a SQL query function is derived from $@ and then passed to pqxx::work::exec1((unnamed parameter 0)) | test.cpp:44:27:44:30 | argv | user input (argv) |
35+
| test.cpp:43:27:43:33 | access to array | test.cpp:43:27:43:30 | argv | test.cpp:43:27:43:33 | access to array | This argument to a SQL query function is derived from $@ and then passed to pqxx::work::exec1((unnamed parameter 0)) | test.cpp:43:27:43:30 | argv | user input (argv) |

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