[sword-devel] Sapphire, module cipher
DM Smith
dmsmith555 at yahoo.com
Thu Mar 2 12:44:14 MST 2006
IANASE (I am not a security expert), but I don't think that it is a
security risk.
I think the security risks are short and/or poorly chosen keys and p2p
sharing.
I like the "enciphered chunk of known data in DataPath" option, if that
is simple to implement.
Keep us posted as to what you do implement.
The code to encipher the module probably would need to drop it there.
While you have it open, perhaps put a quality check on the specified key
(e.g. minimum length, mixed char/digit/symbol).
Perhaps, the routine isKeyValid should delay on bad input before
returning, such as crypt does.
Troy A. Griffitts wrote:
> DM
> Sure, if we decide to provide a mechanism in the engine to
> determine if a key is valid, we can easily do such, and SWMgr, when
> reading the module configuration files, can check and not even load
> the module if it doesn't have a correct key.
>
> I would like to hear opinions of switching from our current security:
>
> you don't know if you have it right until a human looks at the result
> and decides it's intelligable output.
>
> to a programmatic
>
> bool isKeyValid(...)
>
>
> You make an interesting point that someone might be able to
> construct a reasonably successful bool isKeyValid(...) themselves
> based upon a reasonable definition of the domain for the result.
>
> PS. If we decide to implent an isKeyValid(), I'll probably implement
> it quickly by saving an enciphered chunk of known data in DataPath.
>
>
> DM Smith wrote:
>> Off the top of my head:
>> My basic thought is that perhaps it is possible to use something
>> known about the module to determine whether the unlock was good.
>>
>> Perhaps on entry of an unlock key, text could be grabbed from the
>> module and deciphered and then compared to something expected.
>>
>> Today a module is one of a few different markups (GBF, ThML, OSIS,
>> PlainText) and encodings (cp1252 and UTF-8).
>>
>> With regard to the encodings each has some bit patterns that are not
>> allowed. It may be possible to detect them for locked modules. E.g.
>> after decompression, read several hundred bytes from the beginning of
>> the file and look for bad characters or character sequences. E.g.
>> Latin 1 should have some sequences of words containing mostly
>> unaccented characters and spaces every few characters.
>>
>> With regard to markup, one would expect certain sequences to be
>> present for GBF, ThML and OSIS. And for xml certain characters (e.g.
>> control characters) are not allowed. I don't imagine that
>> non-whitespace control characters are of any use for GBF or PlainText
>> as well.
>>
>> Another thought, what if the "encryption" would place the key at the
>> end of the "block", which I think is outside of where the current
>> processes would look for it. If decryption of the block yielded the
>> key, then the key was correct.
>>
>> I don't think there is anything that can prevent a brute force
>> attack. The strength of encryption (i.e. key length and algorithm) is
>> what makes it hard to break. Having a system respond as to whether
>> the key is good or not does not make it any easier to break. (With
>> the code today, it would not be to hard to write a routine that would
>> provide feedback.)
>>
>> I think there is a greater risk to sharing of keys or outright
>> stealing once a key is legitimately obtained.
>>
>> Troy A. Griffitts wrote:
>>
>>> Hey guys,
>>> Sadly, we've known about this since we implemented cipher
>>> support. There may be a bug in sapphire, as DM points out, but
>>> here's the real problem:
>>>
>>> To implement cipher support more securely, we have no way to
>>> know if the user has entered a correct key.
>>>
>>> Consider why. If there was a confirmation of the correct key,
>>> then anyone could brute force all the unlock keys fairly easily. As
>>> it stands now, if they have the correct key, they see correct text,
>>> otherwise, they see jibberish.
>>>
>>> The major problem is that most of our filters don't do a good
>>> job with invalid markup (consider jibberish can have <>[] and other
>>> meta characters).
>>>
>>> So, now how do we protect against the situation which Martin
>>> points out:
>>>
>>> A user has a locked module installed and has entered an invalid
>>> key.
>>>
>>>
>>> Granted, a good first step is to make our filters' error
>>> handling more robust-- which could never be a bad thing, done
>>> without optization hits.
>>>
>>> Other suggestions are most welcomed.
>>>
>>> -Troy.
>>>
>>>
>>>
>>> Martin Gruner wrote:
>>>
>>>> Hi,
>>>>
>>>> sorry for my misunderstanding of how Sword internals work.
>>>>
>>>> However, the problem is there, it may be something in the
>>>> decompression algorithm. I'm attaching a valgrind trace of the
>>>> crash in BibleTime when I try to open the GerHfaLex2002 without a
>>>> valid key.
>>>>
>>>> mg
>>>>
>>>> --
>>>>
>>>> no room in outbuffer to during decompression. see zipcomp.cpp
>>>> ==6598==
>>>> ==6598== Conditional jump or move depends on uninitialised value(s)
>>>> ==6598== at 0x599FD16: sword::EntriesBlock::getMetaEntry(int,
>>>> unsigned long*, unsigned long*) (in /usr/lib/libsword.so.5.0.0)
>>>> ==6598== by 0x599FFC7: sword::EntriesBlock::getEntrySize(int)
>>>> (in /usr/lib/libsword.so.5.0.0)
>>>> ==6598== by 0x599EBDA: sword::zStr::getCompressedText(long,
>>>> long, char**) (in /usr/lib/libsword.so.5.0.0)
>>>> ==6598== by 0x599FB28: sword::zStr::getText(long, char**,
>>>> char**) (in /usr/lib/libsword.so.5.0.0)
>>>> ==6598== by 0x59F0644: sword::zLD::getEntry(long) (in
>>>> /usr/lib/libsword.so.5.0.0)
>>>> ==6598== by 0x59F08DF: sword::zLD::getRawEntryBuf() (in
>>>> /usr/lib/libsword.so.5.0.0)
>>>> ==6598== by 0x59EEC61:
>>>> sword::SWLD::setPosition(sword::SW_POSITION) (in
>>>> /usr/lib/libsword.so.5.0.0)
>>>> ==6598== by 0x812B19E: CSwordLexiconModuleInfo::entries() (in
>>>> /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x80ACF99: CLexiconKeyChooser::refreshContent() (in
>>>> /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x80AD702:
>>>> CLexiconKeyChooser::CLexiconKeyChooser(QValueList<CSwordModuleInfo*>,
>>>> CSwordKey*, QWidget*, char const*) (in
>>>> /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x80A45FE:
>>>> CKeyChooser::createInstance(QValueList<CSwordModuleInfo*>,
>>>> CSwordKey*, QWidget*) (in /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x808785B: CLexiconReadWindow::initView() (in
>>>> /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598==
>>>> ==6598== Conditional jump or move depends on uninitialised value(s)
>>>> ==6598== at 0x599FD16: sword::EntriesBlock::getMetaEntry(int,
>>>> unsigned long*, unsigned long*) (in /usr/lib/libsword.so.5.0.0)
>>>> ==6598== by 0x599FF78: sword::EntriesBlock::getEntry(int) (in
>>>> /usr/lib/libsword.so.5.0.0)
>>>> ==6598== by 0x599EC0F: sword::zStr::getCompressedText(long,
>>>> long, char**) (in /usr/lib/libsword.so.5.0.0)
>>>> ==6598== by 0x599FB28: sword::zStr::getText(long, char**,
>>>> char**) (in /usr/lib/libsword.so.5.0.0)
>>>> ==6598== by 0x59F0644: sword::zLD::getEntry(long) (in
>>>> /usr/lib/libsword.so.5.0.0)
>>>> ==6598== by 0x59F08DF: sword::zLD::getRawEntryBuf() (in
>>>> /usr/lib/libsword.so.5.0.0)
>>>> ==6598== by 0x59EEC61:
>>>> sword::SWLD::setPosition(sword::SW_POSITION) (in
>>>> /usr/lib/libsword.so.5.0.0)
>>>> ==6598== by 0x812B19E: CSwordLexiconModuleInfo::entries() (in
>>>> /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x80ACF99: CLexiconKeyChooser::refreshContent() (in
>>>> /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x80AD702:
>>>> CLexiconKeyChooser::CLexiconKeyChooser(QValueList<CSwordModuleInfo*>,
>>>> CSwordKey*, QWidget*, char const*) (in
>>>> /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x80A45FE:
>>>> CKeyChooser::createInstance(QValueList<CSwordModuleInfo*>,
>>>> CSwordKey*, QWidget*) (in /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x808785B: CLexiconReadWindow::initView() (in
>>>> /home/dev/bibletime/bibletime/bibletime)
>>>> no room in outbuffer to during decompression. see zipcomp.cpp
>>>> ==6598==
>>>> ==6598== Conditional jump or move depends on uninitialised value(s)
>>>> ==6598== at 0x599FFD0: sword::EntriesBlock::getEntrySize(int)
>>>> (in /usr/lib/libsword.so.5.0.0)
>>>> ==6598== by 0x599EBDA: sword::zStr::getCompressedText(long,
>>>> long, char**) (in /usr/lib/libsword.so.5.0.0)
>>>> ==6598== by 0x599FB28: sword::zStr::getText(long, char**,
>>>> char**) (in /usr/lib/libsword.so.5.0.0)
>>>> ==6598== by 0x59F0644: sword::zLD::getEntry(long) (in
>>>> /usr/lib/libsword.so.5.0.0)
>>>> ==6598== by 0x59F0824: sword::zLD::increment(int) (in
>>>> /usr/lib/libsword.so.5.0.0)
>>>> ==6598== by 0x812B263: CSwordLexiconModuleInfo::entries() (in
>>>> /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x80ACF99: CLexiconKeyChooser::refreshContent() (in
>>>> /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x80AD702:
>>>> CLexiconKeyChooser::CLexiconKeyChooser(QValueList<CSwordModuleInfo*>,
>>>> CSwordKey*, QWidget*, char const*) (in
>>>> /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x80A45FE:
>>>> CKeyChooser::createInstance(QValueList<CSwordModuleInfo*>,
>>>> CSwordKey*, QWidget*) (in /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x808785B: CLexiconReadWindow::initView() (in
>>>> /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x80868AE: CDisplayWindow::init() (in
>>>> /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x807E11E:
>>>> BibleTime::createReadDisplayWindow(QValueList<CSwordModuleInfo*>,
>>>> QString const&) (in /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598==
>>>> ==6598== Conditional jump or move depends on uninitialised value(s)
>>>> ==6598== at 0x599FF81: sword::EntriesBlock::getEntry(int) (in
>>>> /usr/lib/libsword.so.5.0.0)
>>>> ==6598== by 0x599EC0F: sword::zStr::getCompressedText(long,
>>>> long, char**) (in /usr/lib/libsword.so.5.0.0)
>>>> ==6598== by 0x599FB28: sword::zStr::getText(long, char**,
>>>> char**) (in /usr/lib/libsword.so.5.0.0)
>>>> ==6598== by 0x59F0644: sword::zLD::getEntry(long) (in
>>>> /usr/lib/libsword.so.5.0.0)
>>>> ==6598== by 0x59F0824: sword::zLD::increment(int) (in
>>>> /usr/lib/libsword.so.5.0.0)
>>>> ==6598== by 0x812B263: CSwordLexiconModuleInfo::entries() (in
>>>> /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x80ACF99: CLexiconKeyChooser::refreshContent() (in
>>>> /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x80AD702:
>>>> CLexiconKeyChooser::CLexiconKeyChooser(QValueList<CSwordModuleInfo*>,
>>>> CSwordKey*, QWidget*, char const*) (in
>>>> /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x80A45FE:
>>>> CKeyChooser::createInstance(QValueList<CSwordModuleInfo*>,
>>>> CSwordKey*, QWidget*) (in /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x808785B: CLexiconReadWindow::initView() (in
>>>> /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x80868AE: CDisplayWindow::init() (in
>>>> /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x807E11E:
>>>> BibleTime::createReadDisplayWindow(QValueList<CSwordModuleInfo*>,
>>>> QString const&) (in /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598==
>>>> ==6598== Conditional jump or move depends on uninitialised value(s)
>>>> ==6598== at 0x401D917: realloc (vg_replace_malloc.c:306)
>>>> ==6598== by 0x599EBF7: sword::zStr::getCompressedText(long,
>>>> long, char**) (in /usr/lib/libsword.so.5.0.0)
>>>> ==6598== by 0x599FB28: sword::zStr::getText(long, char**,
>>>> char**) (in /usr/lib/libsword.so.5.0.0)
>>>> ==6598== by 0x59F0644: sword::zLD::getEntry(long) (in
>>>> /usr/lib/libsword.so.5.0.0)
>>>> ==6598== by 0x59F0824: sword::zLD::increment(int) (in
>>>> /usr/lib/libsword.so.5.0.0)
>>>> ==6598== by 0x812B263: CSwordLexiconModuleInfo::entries() (in
>>>> /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x80ACF99: CLexiconKeyChooser::refreshContent() (in
>>>> /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x80AD702:
>>>> CLexiconKeyChooser::CLexiconKeyChooser(QValueList<CSwordModuleInfo*>,
>>>> CSwordKey*, QWidget*, char const*) (in
>>>> /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x80A45FE:
>>>> CKeyChooser::createInstance(QValueList<CSwordModuleInfo*>,
>>>> CSwordKey*, QWidget*) (in /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x808785B: CLexiconReadWindow::initView() (in
>>>> /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x80868AE: CDisplayWindow::init() (in
>>>> /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x807E11E:
>>>> BibleTime::createReadDisplayWindow(QValueList<CSwordModuleInfo*>,
>>>> QString const&) (in /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598==
>>>> ==6598== Use of uninitialised value of size 4
>>>> ==6598== at 0x401E7AA: strcpy (mac_replace_strmem.c:269)
>>>> ==6598== by 0x599EC1D: sword::zStr::getCompressedText(long,
>>>> long, char**) (in /usr/lib/libsword.so.5.0.0)
>>>> ==6598== by 0x599FB28: sword::zStr::getText(long, char**,
>>>> char**) (in /usr/lib/libsword.so.5.0.0)
>>>> ==6598== by 0x59F0644: sword::zLD::getEntry(long) (in
>>>> /usr/lib/libsword.so.5.0.0)
>>>> ==6598== by 0x59F0824: sword::zLD::increment(int) (in
>>>> /usr/lib/libsword.so.5.0.0)
>>>> ==6598== by 0x812B263: CSwordLexiconModuleInfo::entries() (in
>>>> /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x80ACF99: CLexiconKeyChooser::refreshContent() (in
>>>> /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x80AD702:
>>>> CLexiconKeyChooser::CLexiconKeyChooser(QValueList<CSwordModuleInfo*>,
>>>> CSwordKey*, QWidget*, char const*) (in
>>>> /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x80A45FE:
>>>> CKeyChooser::createInstance(QValueList<CSwordModuleInfo*>,
>>>> CSwordKey*, QWidget*) (in /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x808785B: CLexiconReadWindow::initView() (in
>>>> /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x80868AE: CDisplayWindow::init() (in
>>>> /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x807E11E:
>>>> BibleTime::createReadDisplayWindow(QValueList<CSwordModuleInfo*>,
>>>> QString const&) (in /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598==
>>>> ==6598== Conditional jump or move depends on uninitialised value(s)
>>>> ==6598== at 0x401E7B3: strcpy (mac_replace_strmem.c:269)
>>>> ==6598== by 0x599EC1D: sword::zStr::getCompressedText(long,
>>>> long, char**) (in /usr/lib/libsword.so.5.0.0)
>>>> ==6598== by 0x599FB28: sword::zStr::getText(long, char**,
>>>> char**) (in /usr/lib/libsword.so.5.0.0)
>>>> ==6598== by 0x59F0644: sword::zLD::getEntry(long) (in
>>>> /usr/lib/libsword.so.5.0.0)
>>>> ==6598== by 0x59F0824: sword::zLD::increment(int) (in
>>>> /usr/lib/libsword.so.5.0.0)
>>>> ==6598== by 0x812B263: CSwordLexiconModuleInfo::entries() (in
>>>> /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x80ACF99: CLexiconKeyChooser::refreshContent() (in
>>>> /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x80AD702:
>>>> CLexiconKeyChooser::CLexiconKeyChooser(QValueList<CSwordModuleInfo*>,
>>>> CSwordKey*, QWidget*, char const*) (in
>>>> /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x80A45FE:
>>>> CKeyChooser::createInstance(QValueList<CSwordModuleInfo*>,
>>>> CSwordKey*, QWidget*) (in /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x808785B: CLexiconReadWindow::initView() (in
>>>> /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x80868AE: CDisplayWindow::init() (in
>>>> /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x807E11E:
>>>> BibleTime::createReadDisplayWindow(QValueList<CSwordModuleInfo*>,
>>>> QString const&) (in /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598==
>>>> ==6598== Conditional jump or move depends on uninitialised value(s)
>>>> ==6598== at 0x401E7DC: strcpy (mac_replace_strmem.c:69)
>>>> ==6598== by 0x599EC1D: sword::zStr::getCompressedText(long,
>>>> long, char**) (in /usr/lib/libsword.so.5.0.0)
>>>> ==6598== by 0x599FB28: sword::zStr::getText(long, char**,
>>>> char**) (in /usr/lib/libsword.so.5.0.0)
>>>> ==6598== by 0x59F0644: sword::zLD::getEntry(long) (in
>>>> /usr/lib/libsword.so.5.0.0)
>>>> ==6598== by 0x59F0824: sword::zLD::increment(int) (in
>>>> /usr/lib/libsword.so.5.0.0)
>>>> ==6598== by 0x812B263: CSwordLexiconModuleInfo::entries() (in
>>>> /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x80ACF99: CLexiconKeyChooser::refreshContent() (in
>>>> /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x80AD702:
>>>> CLexiconKeyChooser::CLexiconKeyChooser(QValueList<CSwordModuleInfo*>,
>>>> CSwordKey*, QWidget*, char const*) (in
>>>> /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x80A45FE:
>>>> CKeyChooser::createInstance(QValueList<CSwordModuleInfo*>,
>>>> CSwordKey*, QWidget*) (in /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x808785B: CLexiconReadWindow::initView() (in
>>>> /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x80868AE: CDisplayWindow::init() (in
>>>> /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x807E11E:
>>>> BibleTime::createReadDisplayWindow(QValueList<CSwordModuleInfo*>,
>>>> QString const&) (in /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== Warning: set address range perms: large range 243302452, a
>>>> 0, v 1
>>>> ==6598== Warning: set address range perms: large range 243302481, a
>>>> 1, v 1
>>>> ==6598== Warning: silly arg (-2147483639) to realloc()
>>>> ==6598==
>>>> ==6598== Invalid write of size 1
>>>> ==6598== at 0x401E7C0: strcpy (mac_replace_strmem.c:269)
>>>> ==6598== by 0x599EC1D: sword::zStr::getCompressedText(long,
>>>> long, char**) (in /usr/lib/libsword.so.5.0.0)
>>>> ==6598== by 0x599FB28: sword::zStr::getText(long, char**,
>>>> char**) (in /usr/lib/libsword.so.5.0.0)
>>>> ==6598== by 0x59F0644: sword::zLD::getEntry(long) (in
>>>> /usr/lib/libsword.so.5.0.0)
>>>> ==6598== by 0x59F0824: sword::zLD::increment(int) (in
>>>> /usr/lib/libsword.so.5.0.0)
>>>> ==6598== by 0x812B263: CSwordLexiconModuleInfo::entries() (in
>>>> /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x80ACF99: CLexiconKeyChooser::refreshContent() (in
>>>> /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x80AD702:
>>>> CLexiconKeyChooser::CLexiconKeyChooser(QValueList<CSwordModuleInfo*>,
>>>> CSwordKey*, QWidget*, char const*) (in
>>>> /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x80A45FE:
>>>> CKeyChooser::createInstance(QValueList<CSwordModuleInfo*>,
>>>> CSwordKey*, QWidget*) (in /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x808785B: CLexiconReadWindow::initView() (in
>>>> /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x80868AE: CDisplayWindow::init() (in
>>>> /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== by 0x807E11E:
>>>> BibleTime::createReadDisplayWindow(QValueList<CSwordModuleInfo*>,
>>>> QString const&) (in /home/dev/bibletime/bibletime/bibletime)
>>>> ==6598== Address 0x0 is not stack'd, malloc'd or (recently) free'd
>>>> *** BibleTime got signal 11 (Crashing). Trying to save settings.
>>>> _______________________________________________
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>>>
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