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Add support for ssl.SSLContext.

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Taus Brock-Nannestad
2018-11-28 17:48:09 +01:00
parent 0a839f8468
commit a893dca06e
5 changed files with 66 additions and 24 deletions
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18
python/ql/src/Security/CWE-327/InsecureDefaultProtocol.ql
View File

@@ -16,11 +16,23 @@ FunctionObject ssl_wrap_socket() {
result = any(ModuleObject ssl | ssl.getName() = "ssl").getAttribute("wrap_socket")
}
from CallNode call
ClassObject ssl_Context_class() {
result = any(ModuleObject ssl | ssl.getName() = "ssl").getAttribute("SSLContext")
}
CallNode unsafe_call(string method_name) {
result = ssl_wrap_socket().getACall() and
method_name = "deprecated method ssl.wrap_socket"
or
result = ssl_Context_class().getACall() and
method_name = "ssl.SSLContext"
}
from CallNode call, string method_name
where
call = ssl_wrap_socket().getACall() and
call = unsafe_call(method_name) and
not exists(call.getArgByName("ssl_version"))
select call, "Call to ssl.wrap_socket does not specify a protocol, which may result in an insecure default being used."
select call, "Call to " + method_name + " does not specify a protocol, which may result in an insecure default being used."

43
python/ql/src/Security/CWE-327/InsecureProtocol.ql
View File

@@ -13,7 +13,11 @@
import python
FunctionObject ssl_wrap_socket() {
result = any(ModuleObject ssl | ssl.getName() = "ssl").getAttribute("wrap_socket")
result = the_ssl_module().getAttribute("wrap_socket")
}
ClassObject ssl_Context_class() {
result = the_ssl_module().getAttribute("SSLContext")
}
string insecure_version_name() {
@@ -33,13 +37,27 @@ private ModuleObject the_ssl_module() {
}
private ModuleObject the_pyOpenSSL_module() {
result = any(ModuleObject m | m.getName() = "pyOpenSSL").getAttribute("SSL")
result = any(ModuleObject m | m.getName() = "pyOpenSSL.SSL")
}
predicate unsafe_ssl_wrap_method_call(CallNode call) {
call = ssl_wrap_socket().getACall() and
exists(ControlFlowNode arg | arg = call.getArgByName("ssl_version") |
arg.(AttrNode).getObject(insecure_version_name()).refersTo(the_ssl_module())
predicate unsafe_ssl_wrap_socket_call(CallNode call, string method_name, string insecure_version) {
(
call = ssl_wrap_socket().getACall() and
method_name = "deprecated method ssl.wrap_socket"
or
call = ssl_Context_class().getACall() and
method_name = "ssl.SSLContext"
)
and
insecure_version = insecure_version_name()
and
(
call.getArgByName("ssl_version").refersTo(the_ssl_module().getAttribute(insecure_version))
or
// syntactic match, in case the version in question has been deprecated
exists(ControlFlowNode arg | arg = call.getArgByName("ssl_version") |
arg.(AttrNode).getObject(insecure_version).refersTo(the_ssl_module())
)
)
}
@@ -47,14 +65,15 @@ ClassObject the_pyOpenSSL_Context_class() {
result = any(ModuleObject m | m.getName() = "pyOpenSSL.SSL").getAttribute("Context")
}
predicate unsafe_pyOpenSSL_Context_call(CallNode call) {
predicate unsafe_pyOpenSSL_Context_call(CallNode call, string insecure_version) {
call = the_pyOpenSSL_Context_class().getACall() and
call.getArgByName("method").refersTo(the_pyOpenSSL_module().getAttribute(insecure_version_name()))
insecure_version = insecure_version_name() and
call.getArgByName("method").refersTo(the_pyOpenSSL_module().getAttribute(insecure_version))
}
from CallNode call, string method_name
from CallNode call, string method_name, string insecure_version
where
unsafe_ssl_wrap_method_call(call) and method_name = "ssl.wrap_socket"
unsafe_ssl_wrap_socket_call(call, method_name, insecure_version)
or
unsafe_pyOpenSSL_Context_call(call) and method_name = "pyOpenSSL.SSL.Context"
select call, "Insecure SSL/TLS protocol version specified in call to " + method_name + "."
unsafe_pyOpenSSL_Context_call(call, insecure_version) and method_name = "pyOpenSSL.SSL.Context"
select call, "Insecure SSL/TLS protocol version " + insecure_version + " specified in call to " + method_name + "."