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yara-python.c
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2389 lines (1997 loc) · 53 KB
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/*
Copyright (c) 2007-2013. The YARA Authors. All Rights Reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
/* headers */
#define PY_SSIZE_T_CLEAN
#include <Python.h>
#include "structmember.h"
#if PY_VERSION_HEX >= 0x02060000
#include "bytesobject.h"
#elif PY_VERSION_HEX < 0x02060000
#define PyBytes_AsString PyString_AsString
#define PyBytes_Check PyString_Check
#define PyBytes_FromStringAndSize PyString_FromStringAndSize
#endif
#include <time.h>
#include <yara.h>
#if PY_VERSION_HEX < 0x02050000 && !defined(PY_SSIZE_T_MIN)
typedef int Py_ssize_t;
#define PY_SSIZE_T_MAX INT_MAX
#define PY_SSIZE_T_MIN INT_MIN
#endif
#ifndef PyVarObject_HEAD_INIT
#define PyVarObject_HEAD_INIT(type, size) PyObject_HEAD_INIT(type) size,
#endif
#if PY_VERSION_HEX < 0x03020000
typedef long Py_hash_t;
#endif
#if PY_MAJOR_VERSION >= 3
#define PY_STRING(x) PyUnicode_FromString(x)
#define PY_STRING_TO_C(x) PyUnicode_AsUTF8(x)
#define PY_STRING_CHECK(x) PyUnicode_Check(x)
#else
#define PY_STRING(x) PyString_FromString(x)
#define PY_STRING_TO_C(x) PyString_AsString(x)
#define PY_STRING_CHECK(x) (PyString_Check(x) || PyUnicode_Check(x))
#endif
/* Module globals */
static PyObject* YaraError = NULL;
static PyObject* YaraSyntaxError = NULL;
static PyObject* YaraTimeoutError = NULL;
static PyObject* YaraWarningError = NULL;
#define YARA_DOC "\
This module allows you to apply YARA rules to files or strings.\n\
\n\
For complete documentation please visit:\n\
https://plusvic.github.io/yara\n"
#if defined(_WIN32) || defined(__CYGWIN__)
#include <string.h>
#define strdup _strdup
#endif
// Match object
typedef struct
{
PyObject_HEAD
PyObject* rule;
PyObject* ns;
PyObject* tags;
PyObject* meta;
PyObject* strings;
} Match;
static PyMemberDef Match_members[] = {
{
"rule",
T_OBJECT_EX,
offsetof(Match, rule),
READONLY,
"Name of the matching rule"
},
{
"namespace",
T_OBJECT_EX,
offsetof(Match, ns),
READONLY,
"Namespace of the matching rule"
},
{
"tags",
T_OBJECT_EX,
offsetof(Match, tags),
READONLY,
"List of tags associated to the rule"
},
{
"meta",
T_OBJECT_EX,
offsetof(Match, meta),
READONLY,
"Dictionary with metadata associated to the rule"
},
{
"strings",
T_OBJECT_EX,
offsetof(Match, strings),
READONLY,
"Dictionary with offsets and strings that matched the file"
},
{ NULL } // End marker
};
static PyObject* Match_NEW(
const char* rule,
const char* ns,
PyObject* tags,
PyObject* meta,
PyObject* strings);
static void Match_dealloc(
PyObject* self);
static PyObject* Match_repr(
PyObject* self);
static PyObject* Match_getattro(
PyObject* self,
PyObject* name);
static PyObject* Match_richcompare(
PyObject* self,
PyObject* other,
int op);
static Py_hash_t Match_hash(
PyObject* self);
static PyMethodDef Match_methods[] =
{
{ NULL },
};
static PyTypeObject Match_Type = {
PyVarObject_HEAD_INIT(NULL, 0)
"yara.Match", /*tp_name*/
sizeof(Match), /*tp_basicsize*/
0, /*tp_itemsize*/
(destructor)Match_dealloc, /*tp_dealloc*/
0, /*tp_print*/
0, /*tp_getattr*/
0, /*tp_setattr*/
0, /*tp_compare*/
Match_repr, /*tp_repr*/
0, /*tp_as_number*/
0, /*tp_as_sequence*/
0, /*tp_as_mapping*/
Match_hash, /*tp_hash */
0, /*tp_call*/
0, /*tp_str*/
Match_getattro, /*tp_getattro*/
0, /*tp_setattro*/
0, /*tp_as_buffer*/
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /*tp_flags*/
"Match class", /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
Match_richcompare, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
Match_methods, /* tp_methods */
Match_members, /* tp_members */
0, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
0, /* tp_dictoffset */
0, /* tp_init */
0, /* tp_alloc */
0, /* tp_new */
};
// Rule object
typedef struct
{
PyObject_HEAD
PyObject* identifier;
PyObject* tags;
PyObject* meta;
} Rule;
static void Rule_dealloc(
PyObject* self);
static PyObject* Rule_getattro(
PyObject* self,
PyObject* name);
static PyMemberDef Rule_members[] = {
{
"identifier",
T_OBJECT_EX,
offsetof(Rule, identifier),
READONLY,
"Name of the rule"
},
{
"tags",
T_OBJECT_EX,
offsetof(Rule, tags),
READONLY,
"Tags for the rule"
},
{
"meta",
T_OBJECT_EX,
offsetof(Rule, meta),
READONLY,
"Meta for the rule"
},
{ NULL } // End marker
};
static PyMethodDef Rule_methods[] =
{
{ NULL, NULL }
};
static PyTypeObject Rule_Type = {
PyVarObject_HEAD_INIT(NULL, 0)
"yara.Rule", /*tp_name*/
sizeof(Rule), /*tp_basicsize*/
0, /*tp_itemsize*/
(destructor) Rule_dealloc, /*tp_dealloc*/
0, /*tp_print*/
0, /*tp_getattr*/
0, /*tp_setattr*/
0, /*tp_compare*/
0, /*tp_repr*/
0, /*tp_as_number*/
0, /*tp_as_sequence*/
0, /*tp_as_mapping*/
0, /*tp_hash */
0, /*tp_call*/
0, /*tp_str*/
Rule_getattro, /*tp_getattro*/
0, /*tp_setattro*/
0, /*tp_as_buffer*/
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /*tp_flags*/
"Rule class", /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
Rule_methods, /* tp_methods */
Rule_members, /* tp_members */
0, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
0, /* tp_dictoffset */
0, /* tp_init */
0, /* tp_alloc */
0, /* tp_new */
};
// Rules object
typedef struct
{
PyObject_HEAD
PyObject* externals;
YR_RULES* rules;
YR_RULE* iter_current_rule;
} Rules;
static Rules* Rules_NEW(void);
static void Rules_dealloc(
PyObject* self);
static PyObject* Rules_match(
PyObject* self,
PyObject* args,
PyObject* keywords);
static PyObject* Rules_save(
PyObject* self,
PyObject* args,
PyObject* keywords);
static PyObject* Rules_profiling_info(
PyObject* self,
PyObject* args);
static PyObject* Rules_getattro(
PyObject* self,
PyObject* name);
static PyObject* Rules_next(
PyObject* self);
static PyMethodDef Rules_methods[] =
{
{
"match",
(PyCFunction) Rules_match,
METH_VARARGS | METH_KEYWORDS
},
{
"save",
(PyCFunction) Rules_save,
METH_VARARGS | METH_KEYWORDS
},
{
"profiling_info",
(PyCFunction) Rules_profiling_info,
METH_NOARGS
},
{
NULL,
NULL
}
};
static PyTypeObject Rules_Type = {
PyVarObject_HEAD_INIT(NULL, 0)
"yara.Rules", /*tp_name*/
sizeof(Rules), /*tp_basicsize*/
0, /*tp_itemsize*/
(destructor) Rules_dealloc, /*tp_dealloc*/
0, /*tp_print*/
0, /*tp_getattr*/
0, /*tp_setattr*/
0, /*tp_compare*/
0, /*tp_repr*/
0, /*tp_as_number*/
0, /*tp_as_sequence*/
0, /*tp_as_mapping*/
0, /*tp_hash */
0, /*tp_call*/
0, /*tp_str*/
Rules_getattro, /*tp_getattro*/
0, /*tp_setattro*/
0, /*tp_as_buffer*/
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /*tp_flags*/
"Rules class", /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
PyObject_SelfIter, /* tp_iter */
(iternextfunc) Rules_next, /* tp_iternext */
Rules_methods, /* tp_methods */
0, /* tp_members */
0, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
0, /* tp_dictoffset */
0, /* tp_init */
0, /* tp_alloc */
0, /* tp_new */
};
typedef struct _CALLBACK_DATA
{
PyObject* matches;
PyObject* callback;
PyObject* modules_data;
PyObject* modules_callback;
int which;
} CALLBACK_DATA;
// Forward declarations for handling module data.
PyObject* convert_structure_to_python(
YR_OBJECT_STRUCTURE* structure);
PyObject* convert_array_to_python(
YR_OBJECT_ARRAY* array);
PyObject* convert_dictionary_to_python(
YR_OBJECT_DICTIONARY* dictionary);
PyObject* convert_object_to_python(
YR_OBJECT* object)
{
PyObject* result = NULL;
if (object == NULL)
return NULL;
switch(object->type)
{
case OBJECT_TYPE_INTEGER:
if (object->value.i != UNDEFINED)
result = Py_BuildValue("l", object->value.i);
break;
case OBJECT_TYPE_STRING:
if (object->value.ss != NULL)
result = PyBytes_FromStringAndSize(
object->value.ss->c_string,
object->value.ss->length);
break;
case OBJECT_TYPE_STRUCTURE:
result = convert_structure_to_python(object_as_structure(object));
break;
case OBJECT_TYPE_ARRAY:
result = convert_array_to_python(object_as_array(object));
break;
case OBJECT_TYPE_FUNCTION:
// Do nothing with functions...
break;
case OBJECT_TYPE_DICTIONARY:
result = convert_dictionary_to_python(object_as_dictionary(object));
break;
case OBJECT_TYPE_FLOAT:
if (!isnan(object->value.d))
result = Py_BuildValue("d", object->value.d);
break;
default:
break;
}
return result;
}
PyObject* convert_structure_to_python(
YR_OBJECT_STRUCTURE* structure)
{
YR_STRUCTURE_MEMBER* member;
PyObject* py_object;
PyObject* py_dict = PyDict_New();
if (py_dict == NULL)
return py_dict;
member = structure->members;
while (member != NULL)
{
py_object = convert_object_to_python(member->object);
if (py_object != NULL)
{
PyDict_SetItemString(py_dict, member->object->identifier, py_object);
Py_DECREF(py_object);
}
member =member->next;
}
return py_dict;
}
PyObject* convert_array_to_python(
YR_OBJECT_ARRAY* array)
{
int i;
PyObject* py_object;
PyObject* py_list = PyList_New(0);
if (py_list == NULL)
return py_list;
// If there is nothing in the list, return an empty Python list
if (array->items == NULL)
return py_list;
for (i = 0; i < array->items->count; i++)
{
py_object = convert_object_to_python(array->items->objects[i]);
if (py_object != NULL)
{
PyList_Append(py_list, py_object);
Py_DECREF(py_object);
}
}
return py_list;
}
PyObject* convert_dictionary_to_python(
YR_OBJECT_DICTIONARY* dictionary)
{
int i;
PyObject* py_object;
PyObject* py_dict = PyDict_New();
if (py_dict == NULL)
return py_dict;
// If there is nothing in the YARA dictionary, return an empty Python dict
if (dictionary->items == NULL)
return py_dict;
for (i = 0; i < dictionary->items->used; i++)
{
py_object = convert_object_to_python(dictionary->items->objects[i].obj);
if (py_object != NULL)
{
PyDict_SetItemString(
py_dict,
dictionary->items->objects[i].key,
py_object);
Py_DECREF(py_object);
}
}
return py_dict;
}
#define CALLBACK_MATCHES 0x01
#define CALLBACK_NON_MATCHES 0x02
#define CALLBACK_ALL CALLBACK_MATCHES | CALLBACK_NON_MATCHES
int yara_callback(
int message,
void* message_data,
void* user_data)
{
YR_STRING* string;
YR_MATCH* m;
YR_META* meta;
YR_RULE* rule;
YR_MODULE_IMPORT* module_import;
const char* tag;
PyObject* tag_list = NULL;
PyObject* string_list = NULL;
PyObject* meta_list = NULL;
PyObject* match;
PyObject* callback_dict;
PyObject* object;
PyObject* tuple;
PyObject* matches = ((CALLBACK_DATA*) user_data)->matches;
PyObject* callback = ((CALLBACK_DATA*) user_data)->callback;
PyObject* modules_data = ((CALLBACK_DATA*) user_data)->modules_data;
PyObject* modules_callback = ((CALLBACK_DATA*) user_data)->modules_callback;
PyObject* module_data;
PyObject* callback_result;
PyObject* module_info_dict;
int which = ((CALLBACK_DATA*) user_data)->which;
Py_ssize_t data_size;
PyGILState_STATE gil_state;
int result = CALLBACK_CONTINUE;
if (message == CALLBACK_MSG_SCAN_FINISHED)
return CALLBACK_CONTINUE;
if (message == CALLBACK_MSG_IMPORT_MODULE && modules_data == NULL)
return CALLBACK_CONTINUE;
if (message == CALLBACK_MSG_MODULE_IMPORTED && modules_callback == NULL)
return CALLBACK_CONTINUE;
if (message == CALLBACK_MSG_IMPORT_MODULE)
{
gil_state = PyGILState_Ensure();
module_import = (YR_MODULE_IMPORT*) message_data;
module_data = PyDict_GetItemString(
modules_data,
module_import->module_name);
#if PY_MAJOR_VERSION >= 3
if (module_data != NULL && PyBytes_Check(module_data))
#else
if (module_data != NULL && PyString_Check(module_data))
#endif
{
#if PY_MAJOR_VERSION >= 3
PyBytes_AsStringAndSize(
module_data,
(char**) &module_import->module_data,
&data_size);
#else
PyString_AsStringAndSize(
module_data,
(char**) &module_import->module_data,
&data_size);
#endif
module_import->module_data_size = data_size;
}
PyGILState_Release(gil_state);
return CALLBACK_CONTINUE;
}
if (message == CALLBACK_MSG_MODULE_IMPORTED)
{
gil_state = PyGILState_Ensure();
module_info_dict = convert_structure_to_python(
object_as_structure(message_data));
if (module_info_dict == NULL)
return CALLBACK_CONTINUE;
object = PY_STRING(object_as_structure(message_data)->identifier);
PyDict_SetItemString(module_info_dict, "module", object);
Py_DECREF(object);
Py_INCREF(modules_callback);
callback_result = PyObject_CallFunctionObjArgs(
modules_callback,
module_info_dict,
NULL);
if (callback_result != NULL)
{
#if PY_MAJOR_VERSION >= 3
if (PyLong_Check(callback_result))
#else
if (PyLong_Check(callback_result) || PyInt_Check(callback_result))
#endif
{
result = (int) PyLong_AsLong(callback_result);
}
Py_DECREF(callback_result);
}
else
{
result = CALLBACK_ERROR;
}
Py_DECREF(module_info_dict);
Py_DECREF(modules_callback);
PyGILState_Release(gil_state);
return result;
}
rule = (YR_RULE*) message_data;
gil_state = PyGILState_Ensure();
tag_list = PyList_New(0);
string_list = PyList_New(0);
meta_list = PyDict_New();
if (tag_list == NULL || string_list == NULL || meta_list == NULL)
{
Py_XDECREF(tag_list);
Py_XDECREF(string_list);
Py_XDECREF(meta_list);
PyGILState_Release(gil_state);
return CALLBACK_ERROR;
}
yr_rule_tags_foreach(rule, tag)
{
object = PY_STRING(tag);
PyList_Append(tag_list, object);
Py_DECREF(object);
}
yr_rule_metas_foreach(rule, meta)
{
if (meta->type == META_TYPE_INTEGER)
object = Py_BuildValue("i", meta->integer);
else if (meta->type == META_TYPE_BOOLEAN)
object = PyBool_FromLong((long) meta->integer);
else
object = PY_STRING(meta->string);
PyDict_SetItemString(meta_list, meta->identifier, object);
Py_DECREF(object);
}
yr_rule_strings_foreach(rule, string)
{
yr_string_matches_foreach(string, m)
{
object = PyBytes_FromStringAndSize((char*) m->data, m->data_length);
tuple = Py_BuildValue(
"(L,s,O)",
m->base + m->offset,
string->identifier,
object);
PyList_Append(string_list, tuple);
Py_DECREF(object);
Py_DECREF(tuple);
}
}
if (message == CALLBACK_MSG_RULE_MATCHING)
{
match = Match_NEW(
rule->identifier,
rule->ns->name,
tag_list,
meta_list,
string_list);
if (match != NULL)
{
PyList_Append(matches, match);
Py_DECREF(match);
}
else
{
Py_DECREF(tag_list);
Py_DECREF(string_list);
Py_DECREF(meta_list);
PyGILState_Release(gil_state);
return CALLBACK_ERROR;
}
}
if (callback != NULL &&
((message == CALLBACK_MSG_RULE_MATCHING && (which & CALLBACK_MATCHES)) ||
(message == CALLBACK_MSG_RULE_NOT_MATCHING && (which & CALLBACK_NON_MATCHES))))
{
Py_INCREF(callback);
callback_dict = PyDict_New();
object = PyBool_FromLong(message == CALLBACK_MSG_RULE_MATCHING);
PyDict_SetItemString(callback_dict, "matches", object);
Py_DECREF(object);
object = PY_STRING(rule->identifier);
PyDict_SetItemString(callback_dict, "rule", object);
Py_DECREF(object);
object = PY_STRING(rule->ns->name);
PyDict_SetItemString(callback_dict, "namespace", object);
Py_DECREF(object);
PyDict_SetItemString(callback_dict, "tags", tag_list);
PyDict_SetItemString(callback_dict, "meta", meta_list);
PyDict_SetItemString(callback_dict, "strings", string_list);
callback_result = PyObject_CallFunctionObjArgs(
callback,
callback_dict,
NULL);
if (callback_result != NULL)
{
#if PY_MAJOR_VERSION >= 3
if (PyLong_Check(callback_result))
#else
if (PyLong_Check(callback_result) || PyInt_Check(callback_result))
#endif
{
result = (int) PyLong_AsLong(callback_result);
}
Py_DECREF(callback_result);
}
else
{
result = CALLBACK_ERROR;
}
Py_DECREF(callback_dict);
Py_DECREF(callback);
}
Py_DECREF(tag_list);
Py_DECREF(string_list);
Py_DECREF(meta_list);
PyGILState_Release(gil_state);
return result;
}
/* YR_STREAM read method for "file-like objects" */
static size_t flo_read(
void* ptr,
size_t size,
size_t count,
void* user_data)
{
size_t i;
for (i = 0; i < count; i++)
{
PyGILState_STATE gil_state = PyGILState_Ensure();
PyObject* bytes = PyObject_CallMethod(
(PyObject*) user_data, "read", "n", (Py_ssize_t) size);
PyGILState_Release(gil_state);
if (bytes != NULL)
{
Py_ssize_t len;
char* buffer;
int result = PyBytes_AsStringAndSize(bytes, &buffer, &len);
if (result == -1 || (size_t) len < size)
{
Py_DECREF(bytes);
return i;
}
memcpy((char*) ptr + i * size, buffer, size);
Py_DECREF(bytes);
}
else
{
return i;
}
}
return count;
}
/* YR_STREAM write method for "file-like objects" */
static size_t flo_write(
const void* ptr,
size_t size,
size_t count,
void* user_data)
{
size_t i;
for (i = 0; i < count; i++)
{
PyGILState_STATE gil_state = PyGILState_Ensure();
PyObject* result = PyObject_CallMethod(
#if PY_MAJOR_VERSION >= 3
(PyObject*) user_data, "write", "y#", (char*) ptr + i * size, size);
#else
(PyObject*) user_data, "write", "s#", (char*) ptr + i * size, size);
#endif
PyGILState_Release(gil_state);
if (result == NULL)
return i;
Py_DECREF(result);
}
return count;
}
PyObject* handle_error(
int error,
char* extra)
{
switch(error)
{
case ERROR_COULD_NOT_ATTACH_TO_PROCESS:
return PyErr_Format(
YaraError,
"access denied");
case ERROR_INSUFFICIENT_MEMORY:
return PyErr_NoMemory();
case ERROR_COULD_NOT_OPEN_FILE:
return PyErr_Format(
YaraError,
"could not open file \"%s\"",
extra);
case ERROR_COULD_NOT_MAP_FILE:
return PyErr_Format(
YaraError,
"could not map file \"%s\" into memory",
extra);
case ERROR_INVALID_FILE:
return PyErr_Format(
YaraError,
"invalid rules file \"%s\"",
extra);
case ERROR_CORRUPT_FILE:
return PyErr_Format(
YaraError,
"corrupt rules file \"%s\"",
extra);
case ERROR_SCAN_TIMEOUT:
return PyErr_Format(
YaraTimeoutError,
"scanning timed out");
case ERROR_INVALID_EXTERNAL_VARIABLE_TYPE:
return PyErr_Format(
YaraError,
"external variable \"%s\" was already defined with a different type",
extra);
case ERROR_UNSUPPORTED_FILE_VERSION:
return PyErr_Format(
YaraError,
"rules file \"%s\" is incompatible with this version of YARA",
extra);
default:
return PyErr_Format(
YaraError,
"internal error: %d",
error);
}
}
int process_compile_externals(
PyObject* externals,
YR_COMPILER* compiler)
{
PyObject* key;
PyObject* value;
Py_ssize_t pos = 0;
char* identifier = NULL;
int result;
while (PyDict_Next(externals, &pos, &key, &value))
{
identifier = PY_STRING_TO_C(key);
if (PyBool_Check(value))
{
result = yr_compiler_define_boolean_variable(
compiler,
identifier,
PyObject_IsTrue(value));
}
#if PY_MAJOR_VERSION >= 3
else if (PyLong_Check(value))
#else
else if (PyLong_Check(value) || PyInt_Check(value))
#endif
{
result = yr_compiler_define_integer_variable(
compiler,
identifier,
PyLong_AsLong(value));
}
else if (PyFloat_Check(value))
{
result = yr_compiler_define_float_variable(
compiler,
identifier,