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Main.cpp
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Main.cpp
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// Yara4Ida plugin main
#include "stdafx.h"
#include "MainDialog.h"
#ifndef _DEBUG
#pragma comment(lib, "libyara/Release/libyara64.lib")
#else
#pragma comment(lib, "libyara/Debug/libyara64.lib")
#endif
#define DEFAULT_RULES_FOLDER L"yara4ida_rules\\default.yar"
#define DEFAULT_SHORTCUT "Ctrl-Y"
#define COMMENT_TAG "#YARA: "
static plugmod_t* idaapi init();
static void idaapi term();
static bool idaapi run(size_t);
extern BOOL ScanSegments(__out MATCHES& matches);
LPCSTR YaraStatusString(int error);
BOOL optionPlaceComments = TRUE;
BOOL optionSingleThread = FALSE;
BOOL optionVerbose = FALSE;
//
static WCHAR rulesPath[MAX_PATH] = { 0 };
static char basePath[MAX_PATH] = { 0 };
static char lastRulesFile[MAX_PATH] = { 0 };
static BOOL listChooserUp = FALSE;
static BOOL initResourcesOnce = FALSE;
static int chooserIcon = 0;
// YARA and other data that must be persistent while chooser control is up
static int yaraInitalized = -1;
static YR_COMPILER *s_compiler = NULL;
YR_RULES *g_rules = NULL;
static MATCHES matches;
static std::map<segment_t*, qstring> seg2name;
// ------------------------------------------------------------------------------------------------
// Plug-in description block
__declspec(dllexport) plugin_t PLUGIN =
{
IDP_INTERFACE_VERSION,
PLUGIN_PROC,
init,
term,
run,
"Yara4Ida: (\"Yara for IDA\"). Yara: \"The pattern matching swiss knife\". Unofficial YARA IDA plugin.",
" ",
"Yara4Ida",
DEFAULT_SHORTCUT
};
static plugmod_t* idaapi init()
{
return PLUGIN_KEEP; // PLUGIN_OK
}
// Normally doesn't hit as we need to stay resident for the modal windows
static void idaapi term()
{
try
{
if (g_rules)
{
yr_rules_destroy(g_rules);
g_rules = NULL;
}
if (s_compiler)
{
yr_compiler_destroy(s_compiler);
s_compiler = NULL;
}
if (yaraInitalized == ERROR_SUCCESS)
{
yr_finalize();
yaraInitalized = -1;
}
matches.clear();
seg2name.clear();
listChooserUp = FALSE;
if (initResourcesOnce)
{
if (chooserIcon)
{
free_custom_icon(chooserIcon);
chooserIcon = 0;
}
Q_CLEANUP_RESOURCE(PlugInRes);
initResourcesOnce = FALSE;
}
}
CATCH("term()")
}
// ------------------------------------------------------------------------------------------------
// Rules match IDA chooser/list view
class MatchChooser : public chooser_multi_t
{
enum COLUMNS
{
COL_ADDRESS,
COL_DESCRIPTION,
COL_TAGS,
COL_FILE,
COL_COUNT
};
static int _widths[COL_COUNT];
static const char *_header[COL_COUNT];
static const char _title[];
public:
MatchChooser() : chooser_multi_t(CH_QFTYP_DEFAULT, _countof(_header), _widths, _header, _title)
{
seg2name.clear();
// Setup hex address display to the minimal length plus a leading zero
ea_t maxAddress = 0;
size_t maxSegStr = 0;
for (MATCH& m : matches)
{
if (m.address > maxAddress)
maxAddress = m.address;
if (segment_t* seg = getseg(m.address))
{
qstring name;
get_segm_name(&name, seg);
seg2name.try_emplace(seg, name);
if (name.size() > maxSegStr)
maxSegStr = name.size();
}
}
char buffer[32];
size_t digits = strlen(_ui64toa((UINT64)maxAddress, buffer, 16));
if (++digits > 16) digits = 16;
sprintf_s(addressFormat, sizeof(addressFormat), "%%s:%%0%ullX", (UINT32)digits);
// Custom chooser icon
icon = chooserIcon;
}
virtual void closed()
{
// Clean up
term();
}
virtual const void* get_obj_id(size_t *len) const
{
*len = strlen(title);
return title;
}
virtual size_t get_count() const { return matches.size(); }
// On row clicked or enter pressed
virtual cbres_t enter(sizevec_t* sel)
{
size_t n = sel->front();
if (n < get_count())
jumpto(matches[n].address);
return NOTHING_CHANGED;
}
// Generate a row info
virtual void get_row(qstrvec_t *cols_, int *icon_, chooser_item_attrs_t *attributes, size_t n) const
{
try
{
qstrvec_t &cols = *cols_;
MATCH &m = matches[n];
LPCSTR name;
segment_t *seg = getseg(m.address);
if (seg && (seg2name.find(seg) != seg2name.end()))
name = seg2name[seg].c_str();
else
name = "?????";
cols[COL_ADDRESS].sprnt(addressFormat, name, (UINT64)m.address);
// Get description string if rule has one
BOOL gotDescription = FALSE;
YR_META *meta;
yr_rule_metas_foreach(m.rule, meta)
{
if ((meta->type == META_TYPE_STRING) && (meta->identifier))
{
if (strcmp(meta->identifier, "description") == 0)
{
if (meta->string)
{
cols[COL_DESCRIPTION] = meta->string;
gotDescription = TRUE;
}
break;
}
}
}
// Use rule name if there's no description
if (!gotDescription)
cols[COL_DESCRIPTION] = ((m.rule->identifier != NULL) ? m.rule->identifier : "?????");
qstring tags;
LPCSTR tag_name;
yr_rule_tags_foreach(m.rule, tag_name)
{
tags += tag_name;
tags += ' ';
}
cols[COL_TAGS] = tags;
cols[COL_FILE] = ((m.rule->ns && m.rule->ns->name) ? m.rule->ns->name : "?????");
*icon_ = -1;
}
CATCH("MatchChooser:get_row()")
}
private:
char addressFormat[16];
};
const char MatchChooser::_title[] = { "{ YARA Matches }" };
const char* MatchChooser::_header[COL_COUNT] = { "Address", "Description", "Tags", "File" };
int MatchChooser::_widths[COL_COUNT] = { /*Address*/ 12, /*Description*/ 40, /*Tags*/ 8, /*File. Auto-extends to the end*/ 20 };
// ------------------------------------------------------------------------------------------------
// YARA compile warnings and error callback
static void YaraCompilerStatusCallback(int error_level, __in const char *file_name, int line_number, __in const YR_RULE *rule, __in const char *message, __in void *user_data)
{
__try
{
switch (error_level)
{
case YARA_ERROR_LEVEL_ERROR:
{
// On return from this error, the compiler will abort
msg("\n ** Rule compile ERROR: **\n");
*((LPBOOL) user_data) = TRUE;
}
break;
case YARA_ERROR_LEVEL_WARNING:
{
if (!optionVerbose)
return;
msg("\n Rule compile WARNING:\n");
}
break;
};
msg(" File: \"%s\", line: %d\n", file_name, line_number);
if (rule && rule->metas && rule->metas->identifier)
msg(" Desc: \"%s\"\n", rule->metas->identifier);
msg(" Reason: \"%s\"\n", message);
REFRESH_UI();
}
__except (ReportException("YaraCompilerStatusCallback", GetExceptionInformation()))
{
*((LPBOOL)user_data) = TRUE;
}
}
// YARA compile include file callback
static const char* YaraCompilerIncludesCallback(__in const char *include_name, __in const char *calling_rule_filename, __in const char *calling_rule_namespace, __in void *user_data)
{
// Need this for two reasons:
// 1) To resolve relative paths for "include" directive files.
// 2) Verbose log/msg output for showing the inclusion of "include" directive files.
BOOL success = FALSE;
FILE *fp = NULL;
LPSTR fileBuffer = NULL;
try
{
if (optionVerbose)
//msg(" Include: \"%s\", Calling rule: \"%s\", \"%s\"\n", include_name, calling_rule_filename, calling_rule_namespace);
msg(" Include: Path: \"%s\", Calling rule: \"%s\"\n", include_name, calling_rule_filename);
// Convert the usual relative to absolute path as needed
char fixedPath[MAX_PATH];
if (PathIsRelativeA(include_name))
{
// Combine with base path derived from the root input file
char combinedPath[MAX_PATH] = { 0 };
if (!PathCombineA(combinedPath, basePath, include_name))
{
msg("YaraCompilerIncludesCallback: ** Failed to combine paths! **\n");
return NULL;
}
// Clean up combined path
GetFullPathNameA(combinedPath, sizeof(fixedPath), fixedPath, NULL);
include_name = fixedPath;
}
// Read the text file into a buffer and return it
qwstring includePath;
utf8_utf16(&includePath, include_name);
errno_t err = _wfopen_s(&fp, includePath.c_str(), L"rbS");
if (err != 0)
goto exit;
long fileSize = fsize(fp);
if (fileSize == -1)
goto exit;
fileBuffer = (LPSTR) _aligned_malloc((size_t)fileSize + 1, 32);
if (!fileBuffer)
goto exit;
success = (fread(fileBuffer, (size_t)fileSize, 1, fp) == 1);
fileBuffer[fileSize] = 0;
}
CATCH("YaraCompilerIncludesCallback()")
exit:;
if (fp)
{
fclose(fp);
fp = NULL;
}
if (success)
return fileBuffer;
else
{
_aligned_free(fileBuffer);
fileBuffer = NULL;
return NULL;
}
}
//
static void YaraCompilerIncludesFree(__in const char *callback_result_ptr, __in void *user_data)
{
_aligned_free((PVOID) callback_result_ptr);
}
// ------------------------------------------------------------------------------------------------
void AltFileBtnHandler()
{
if (LPSTR sigPathUtf8 = ask_file(FALSE, "*.yar;*.yara;*.rules", "Yara4Ida: Select YARA rules file"))
{
// From UTF-8 to WCHAR'ish
qwstring tmp;
utf8_utf16(&tmp, sigPathUtf8);
wcsncpy_s(rulesPath, MAX_PATH, tmp.c_str(), tmp.size());
}
}
static bool idaapi run(size_t arg)
{
// Don't run again while our chooser is already up
if (listChooserUp)
{
PlaySound((LPCSTR) SND_ALIAS_SYSTEMEXCLAMATION, NULL, (SND_ALIAS_ID | SND_ASYNC));
return true;
}
BOOL success = FALSE;
BOOL compileError = FALSE;
FILE *fp = NULL;
try
{
qstring version, tmp;
version.sprnt("v%s, built %s", GetVersionString(MY_VERSION, tmp).c_str(), __DATE__);
msg("\n>> " MSG_TAG "%s\n", version.c_str());
REFRESH_UI();
if (!auto_is_ok())
{
msg(MSG_TAG "* Please wait for IDA analysis to complete first!, Aborted *\n");
goto exit;
}
// Get the default relative to the IDA plugin rules file path
HMODULE myModule = NULL;
GetModuleHandleExA((GET_MODULE_HANDLE_EX_FLAG_UNCHANGED_REFCOUNT | GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS), (LPCTSTR) &run, &myModule);
GetModuleFileNameExW(GetCurrentProcess(), myModule, rulesPath, SIZESTR(rulesPath));
PathRemoveFileSpecW(rulesPath);
wcscat(rulesPath, L"\\" DEFAULT_RULES_FOLDER);
if (!initResourcesOnce)
{
initResourcesOnce = TRUE;
Q_INIT_RESOURCE(PlugInRes);
QFile file(STYLE_PATH "icon.png");
if (file.open(QFile::ReadOnly))
{
QByteArray ba = file.readAll();
chooserIcon = load_custom_icon(ba.constData(), ba.size(), "png");
}
}
// -------------------------------------------
// 1) Do main dialog
if (doMainDialog(optionPlaceComments, optionSingleThread, optionVerbose))
{
msg("- Canceled -\n\n");
success = TRUE;
return true;
}
// -------------------------------------------
// 2) Initialize libyara and open the rules file
WaitBox::show("Yara for IDA", "Scanning..", "url(" STYLE_PATH "progress-style.qss)", STYLE_PATH "icon.png");
WaitBox::updateAndCancelCheck(-1);
REFRESH_UI();
char numBuff[32], timeBuff[64];
TIMESTAMP startTime = GetTimestamp();
yaraInitalized = yr_initialize();
if (yaraInitalized != ERROR_SUCCESS)
{
msg(MSG_TAG "** YARA yr_initialize() failed with: %s **\n", YaraStatusString(yaraInitalized));
goto exit;
}
// Create compiler object
int yaraResult = yr_compiler_create(&s_compiler);
if (yaraResult != ERROR_SUCCESS)
{
msg(MSG_TAG "** YARA yr_compiler_create() failed with: %s **\n", YaraStatusString(yaraResult));
goto exit;
}
yr_compiler_set_callback(s_compiler, YaraCompilerStatusCallback, &compileError);
yr_compiler_set_include_callback(s_compiler, YaraCompilerIncludesCallback, YaraCompilerIncludesFree, NULL);
//msg("yr_compiler_create time: %s\n", TimestampString(GetTimestamp() - startTime, buffer2));
// Open rules file
qstring utf8Path;
utf16_utf8(&utf8Path, rulesPath);
strncpy_s(lastRulesFile, sizeof(lastRulesFile), utf8Path.c_str(), SIZESTR(lastRulesFile));
strncpy_s(basePath, sizeof(basePath), utf8Path.c_str(), SIZESTR(basePath) - 1);
if (LPSTR filename = PathFindFileNameA(basePath))
*filename = 0;
msg("Loading rules from: \"%s\"\n", lastRulesFile);
REFRESH_UI();
errno_t err = _wfopen_s(&fp, rulesPath, L"rbS");
if (err != 0)
{
char buffer[1024];
strerror_s(buffer, sizeof(buffer), err);
msg(MSG_TAG "** Rules open failed with: \"%s\" **\n", buffer);
goto exit;
}
// -------------------------------------------
// 3) Compile rules from rules file by handle
yaraResult = yr_compiler_add_file(s_compiler, fp, utf8Path.c_str(), utf8Path.c_str());
if (compileError)
{
// If compile error, bail out here since the yaraResult usually doesn't match the error
goto exit;
}
else
if (yaraResult != ERROR_SUCCESS)
{
msg(MSG_TAG "** YARA yr_compiler_add_file() failed with: %s **\n", YaraStatusString(yaraResult));
goto exit;
}
fclose(fp);
fp = NULL;
// Get a rule set ref from the compiler instance
yaraResult = yr_compiler_get_rules(s_compiler, &g_rules);
if (yaraResult != ERROR_SUCCESS)
{
msg(MSG_TAG "** YARA yr_compiler_get_rules() failed with: %s **\n", YaraStatusString(yaraResult));
goto exit;
}
msg("%s rules loaded in %s\n", NumberCommaString(g_rules->num_rules, numBuff), TimestampString(GetTimestamp() - startTime, timeBuff));
if (g_rules->num_rules == 0)
{
msg("* No rules loaded, aborted *\n");
goto exit;
}
REFRESH_UI();
// -------------------------------------------
// 4) Scan segments with compiled YARA rules
if (ScanSegments(matches))
{
// On user abort or failure
success = FALSE;
goto exit;
}
// -------------------------------------------
// 5) Optionally place comments, and show a match result IDA chooser
if (!matches.empty())
{
if (optionPlaceComments)
{
for (MATCH &m : matches)
{
// Snap address to nearest item address
ea_t address = get_item_head(m.address);
// Already has comment?
qstring comment;
int size = (int) get_cmt(&comment, address, TRUE);
if (size > 0)
{
// Yes. Skip if already has a comment from us from a previous run
if ((size > sizeof(COMMENT_TAG)) && (comment.find(COMMENT_TAG) != qstring::npos))
size = -1;
if (size != -1)
{
// If large string add a line break else use a space to separate them
if (size >= 54)
{
comment.append('\n');
size += SIZESTR("\n");
}
else
{
comment.append(' ');
size += SIZESTR(" ");
}
}
}
else
size = 0;
if (size >= 0)
{
// Get description string if rule has one
LPCSTR description = NULL;
YR_META *meta;
yr_rule_metas_foreach(m.rule, meta)
{
if ((meta->type == META_TYPE_STRING) && (meta->identifier))
{
if (strcmp(meta->identifier, "description") == 0)
{
if (meta->string)
description = meta->string;
break;
}
}
}
// If no description use rule name
if (!description || !description[0])
description = ((m.rule->identifier != NULL) ? m.rule->identifier : "????");
char buffer[MAXSTR];
if (comment.empty())
_snprintf_s(buffer, sizeof(buffer), SIZESTR(buffer), COMMENT_TAG "\"%s\" ", description);
else
_snprintf_s(buffer, sizeof(buffer), SIZESTR(buffer), "%s" COMMENT_TAG "\"%s\" ", comment.c_str(), description);
set_cmt(address, buffer, TRUE);
}
}
}
// Show the match chooser
//if (iconID == -1)
// iconID = load_custom_icon(iconData, sizeof(iconData), "png");
MatchChooser *chooser = new MatchChooser();
success = listChooserUp = (chooser && (chooser->choose() == 0));
msg(MSG_TAG "Found %s matches in %s\n", NumberCommaString(matches.size(), numBuff), TimestampString(GetTimestamp() - startTime, timeBuff));
}
else
{
msg("Done. No rule matches found.\n");
goto exit;
}
}
CATCH("run()")
exit:;
if (fp)
{
fclose(fp);
fp = NULL;
}
if (!success)
{
// Clean up YARA data on abort or failure
msg("* Aborted *\n");
//term();
}
if (optionPlaceComments)
refresh_idaview_anyway();
WaitBox::hide();
REFRESH_UI();
return TRUE;
}
// ------------------------------------------------------------------------------------------------
// In the libyara source there's a "yr_debug_error_as_string()", but not exposed from the library
LPCSTR YaraStatusString(int error)
{
if ((error >= ERROR_SUCCESS) && (error <= ERROR_IDENTIFIER_MATCHES_WILDCARD))
{
const char* strings[] =
{
"ERROR_SUCCESS", // 0
"ERROR_INSUFFICIENT_MEMORY", // 1
"ERROR_COULD_NOT_ATTACH_TO_PROCESS", // 2
"ERROR_COULD_NOT_OPEN_FILE", // 3
"ERROR_COULD_NOT_MAP_FILE", // 4
"ERROR_INVALID_FILE", // 6
"ERROR_CORRUPT_FILE", // 7
"ERROR_UNSUPPORTED_FILE_VERSION", // 8
"ERROR_INVALID_REGULAR_EXPRESSION", // 9
"ERROR_INVALID_HEX_STRING", // 10
"ERROR_SYNTAX_ERROR", // 11
"ERROR_LOOP_NESTING_LIMIT_EXCEEDED", // 12
"ERROR_DUPLICATED_LOOP_IDENTIFIER", // 13
"ERROR_DUPLICATED_IDENTIFIER", // 14
"ERROR_DUPLICATED_TAG_IDENTIFIER", // 15
"ERROR_DUPLICATED_META_IDENTIFIER", // 16
"ERROR_DUPLICATED_STRING_IDENTIFIER", // 17
"ERROR_UNREFERENCED_STRING", // 18
"ERROR_UNDEFINED_STRING", // 19
"ERROR_UNDEFINED_IDENTIFIER", // 20
"ERROR_MISPLACED_ANONYMOUS_STRING", // 21
"ERROR_INCLUDES_CIRCULAR_REFERENCE", // 22
"ERROR_INCLUDE_DEPTH_EXCEEDED", // 23
"ERROR_WRONG_TYPE", // 24
"ERROR_EXEC_STACK_OVERFLOW", // 25
"ERROR_SCAN_TIMEOUT", // 26
"ERROR_TOO_MANY_SCAN_THREADS", // 27
"ERROR_CALLBACK_ERROR", // 28
"ERROR_INVALID_ARGUMENT", // 29
"ERROR_TOO_MANY_MATCHES", // 30
"ERROR_INTERNAL_FATAL_ERROR", // 31
"ERROR_NESTED_FOR_OF_LOOP", // 32
"ERROR_INVALID_FIELD_NAME", // 33
"ERROR_UNKNOWN_MODULE", // 34
"ERROR_NOT_A_STRUCTURE", // 35
"ERROR_NOT_INDEXABLE", // 36
"ERROR_NOT_A_FUNCTION", // 37
"ERROR_INVALID_FORMAT", // 38
"ERROR_TOO_MANY_ARGUMENTS", // 39
"ERROR_WRONG_ARGUMENTS", // 40
"ERROR_WRONG_RETURN_TYPE", // 41
"ERROR_DUPLICATED_STRUCTURE_MEMBER", // 42
"ERROR_EMPTY_STRING", // 43
"ERROR_DIVISION_BY_ZERO", // 44
"ERROR_REGULAR_EXPRESSION_TOO_LARGE", // 45
"ERROR_TOO_MANY_RE_FIBERS", // 46
"ERROR_COULD_NOT_READ_PROCESS_MEMORY", // 47
"ERROR_INVALID_EXTERNAL_VARIABLE_TYPE", // 48
"ERROR_REGULAR_EXPRESSION_TOO_COMPLEX", // 49
"ERROR_INVALID_MODULE_NAME", // 50
"ERROR_TOO_MANY_STRINGS", // 51
"ERROR_INTEGER_OVERFLOW", // 52
"ERROR_CALLBACK_REQUIRED", // 53
"ERROR_INVALID_OPERAND", // 54
"ERROR_COULD_NOT_READ_FILE", // 55
"ERROR_DUPLICATED_EXTERNAL_VARIABLE", // 56
"ERROR_INVALID_MODULE_DATA", // 57
"ERROR_WRITING_FILE", // 58
"ERROR_INVALID_MODIFIER", // 59
"ERROR_DUPLICATED_MODIFIER", // 60
"ERROR_BLOCK_NOT_READY", // 61
"ERROR_INVALID_PERCENTAGE", // 62
"ERROR_IDENTIFIER_MATCHES_WILDCARD" // 63
};
return strings[error];
}
else
return "UNKNOWN";
}