Cryptographic software

A Solution for Mosh Scrollback

Wednesday, July 22, 2015 

Mosh is a pretty good tool, almost indispensable when working in places with crappy internet. While it is designed to help with situations like “LTE on the beach,” it actually works very well in places where internet connectivity is genuinely bad: 1500msec RT, latency, 30% packet loss, and frequent drops in connectivity that last seconds to hours, otherwise known as most of the world. On a good day I lose an SSH connection randomly about every 3-6 hours but I’ve only ever lost a Mosh session when my system went down.

It does a lot of things, but two are key for my use: it syncs user input in the background while local echoing what you type so you can finish your command (and correct a typo) without waiting 1500msec for the remote echo to update; and it creates persistent connections that survive drop off of almost any type except killing the terminal application on one end or the other (anything between can die and when it recovers, you catch up). This means compiles finish and you actually get the output warnings…

…well…

…some of them. Because Mosh’s one giant, glaring, painful, almost debilitating weakness is that it doesn’t support scrollback. So compared to tmux or something else that you can reconnect to after your SSH session drops, you really lose screen content, which is a PITA when ls-ing a directory. I mean, it isn’t that much of an efficiency gain to have to type “ls | less” instead of just “ls” every time you want to see a directory.

I found a solution that works for me. I also use Tmux with Mosh because Tmux will survive a dead client and working with Windows client reboots are a fact of life (I know, sad, but there are some tools I still need on windows, hopefully not for much longer).

Tmux has a facility for creating a local log file, which I then “tail -f” using a separate SSH window. If the SSH client disconnects, no loss, I can pick up the log anytime. It is just mirroring everything that the mosh terminal is doing and the scroll bar scroll back works fine. And it is a raw text file, so you can pipe the output through grep to limit what’s displayed to something of interest and review the log asynchronously as, say, a build is progressing.

Although there are some nice advantages to this, when/if Mosh supports scrollback, it’ll be far more convenient having it in the same window, but for now this is the easiest solution I could come up with.

FreeBSD:

# portmaster sysutils/tmux
# portmaster net/mosh
# ee ~/.tmux.conf
-> bind-key H pipe-pane -o "exec cat >>$HOME/'#W-tmux.log'" \; display-message 'Logging enabled to $HOME/#W-tmux.log'
-> set -g history-limit 30000
Start a Mosh session (for example with Mobaxterm on windows)
# tmux
# [CTRL]-b H
start SSH session (Mobaxterm or Putty on windows)
# tail -f csh-tmux.log
("csh" will be the name of the mosh window - so really "(MoshWindowName)-tmux.log"

You can tmux the ssh session too and still have scrollback and then just reconnect into the same tail command, which preserves the whole scrollback. If you’re on a connection like I’m on, your scrollback logfile will drop off a couple of times a day, but you won’t lose your Mosh session, and it’ll be waiting for you when you’re reminded that you need to see those security warnings from the compile that just scrolled off the Mosh screen forever.

Posted at 00:57:12 UTC

Category: FreeBSDHowToLinuxtechnology

What’s Right About PGP

Thursday, August 14, 2014 

Occasionally you find the crankypants commentary about the “problems” with PGP. These commentaries are invariably written by people who fail to recognize the use modality that PGP is meant to address.

PGP is a cryptographic tool that is, genuinely, annoying to use in most current implementations (though I find the APG extension to the K9 mail app on the android as easy or easier to use than the current Enigmail implementation for Thunderbird.)  The purpose of PGP is to encrypt the contents of mail messages sent between correspondents.  Characteristics of these messages are that they have more than ephemeral value (you might need to reference them again in the future) and that the correspondents are not attempting to hide the fact that they correspond.

It is intrinsic to the capabilities of the tool that it does not serve to hide with whom you are communicating (there are tools for doing this, but they involve additional complexity) and all messages encrypted with a single key can be decrypted with that key. As such keys are typically protected by a password the user must remember. It is a sufficiently accurate simplification of the process to consider the messages themselves protected by a password that the owner of the messages must remember and might possibly be forced to divulge as the fundamental limit on the security of the messages so protected. There are different tools for different purposes that exchange ephemeral keys that the user doesn’t ever know, aren’t protected by a mnemonic password, and therefore can never be forced to divulge).

These rants against PGP annoy me because PGP is an excellent tool that is marred by minor usability problems. Energy expended on ignorantly dismissing the tool is energy that could be better spent improving it.  By far the most important use cases for the vast majority of users that have any real reason to consider cryptography are only addressed by PGP.  I make such a claim based on the following:

  • Most business and important correspondence is conducted by email and despite the hyperventilation of some ignorant children, will remain so for the foreseeable future.
  • Important correspondence, more or less by definition, has a useful shelf life of more than one read and generally serves as a durable (and legally admissible) record.
  • There are people who have legitimate reasons to obfuscate their correspondents: email, even PGP encrypted email, is not a suitable tool for this task.
  • There are people who have legitimate reason to communicate messages that must not be permanently recorded and for which either the value of the communication is ephemeral or the risk is so great that destroying the archive is a reasonable trade-off: email, even with PGP, is not a suitable tool for this task.
  • There’s some noise in the rant about not being sufficient to protect against NSA targeted intercept or thwarting NSA data archiving, which makes an implicit claim that the author has some solution that might provide such protection to end users. I consider such claims tantamount to homicide.  If someone is targeted by state-level surveillance, they can’t use a Turing-complete device (any digital device) to communicate information that puts them at risk; any suggestion to the contrary is dangerous misinformation.

Current implementations of PGP have flaws:

  • For some reason, mail clients still don’t prompt for the import or generation of PGP keys whenever a new account is set up.  That’s somewhat pathetic.
  • For some reason, address books integrated into mail clients don’t have a field for the public key of the associate.  This is a bizarre omission that necessitates add-on key management plug-ins that just make the process more complicated.
  • It is somewhat complicated by IMAP, but no client stores encrypted messages locally in unencrypted form, which makes them difficult to search and reduces their value as an archival record.  This has trivial security value: your storage device is, of course, encrypted or exposing your email should your device be lost is likely to be the least of your problems.

PGP is, despite these shortcomings, one of the most important cryptographic tools available.

Awesome properties of PGP keys no other cryptographic system can touch

PGP keys are (like all cryptographic keys in use by any system) long strings of seemingly random data.  The more seemingly random, the better.  They are, by that very nature, nonmnemonic.  Public key cryptosystems, like PGP, have an awesome, incredibly useful characteristic that you can publish your public key (a long, random string of numbers) and someone you’ve never met can encrypt a message using that public key and only your private key can decrypt it.

Conversely, you can “sign” data with your “private key” and anyone can verify that you signed it by decrypting it with your public key (or more precisely a short mathematical summary of your message).  This is so secure, it is a federally accepted signature mechanism.

There’s a hypothesized attack called a Man In The Middle attack (often abbreviated “MITM”) that exploits the fact these keys aren’t really human readable (you can, but they’re so long you won’t) whereby an attacker (traditionally the much maligned Eve) intercepts messages between two parties (traditionally the secretive Alice and Bob), pretending to be Bob whilst communicating with Alice and pretending to be Alice whilst communicating with Bob.  By substituting her keys for Alice’s and Bob’s, both Bob and Alice inadvertently send messages that Eve can decrypt and she “simply” forwards Bob’s to Alice using Alice’s public key and vice versa so they decrypt as expected, despite coming from the evil Eve.

Eve must, however, be able to intercept all of Alice and Bob’s communication or her attack may be discovered when the keys change, which is not practical in the real world on an ongoing basis (but, ironically, is easier with ephemeral keys). Pretending to be someone famous is easier and could be more valuable as people you don’t know might send you unsolicited private correspondence intended for the famous person: the cure is widely disseminating key “fingerprints” to make the discovery of false keys very hard to prevent.  And if you expect people to blindly send you high-priority information with your public key, you have an obligation to mitigate the risk of a false recipient.

Occasionally it is hypothesized that this attack compromises the utility of PGP; it is a shortcoming of all cryptographic systems that the keys are not human readable if they are even marginally secure.  It is intrinsic to a public key infrastructure that the public keys must be exchanged.  It is therefore axiomatic that a PKI-based cryptographic system will be predicated on mechanisms to exchange nonmnemonic key information. And hidden key exchange, as implemented by OTR or other ephemeral key systems makes MITM attacks harder to detect.

While it is true that elliptic curve PKI algorithms achieve equivalent security with shorter keys, they are still far too long to be mnemonic.  One might nominally equivalence a 4k RSA key with a 0.5k elliptic curve key, a non-trivial factor of 8 reduction with some significance to algorithmic efficiency, but no practical difference in human readability.  Migrating to elliptic curves is on the roadmap for PGP (with GPG 2.1, now in beta) and should be expedited.

PGP Key management is a little annoying

Actually, it  isn’t so much PGP that makes this true, but rather the fact that mail clients haven’t integrated PGP into the client.  That Gmail and Yahoo mail will soon be integrating PGP into their mail clients is a huge step in the right direction even if integrating encryption into a webmail client is kind of pointless since the user is already clearly utterly unconcerned with privacy at all if they’re gifting Google or Yahoo their correspondence.  Why people who should know better still use Gmail is a mystery to me.  When people who care about data security use a gmail address it is like passing the temperance preacher passed out drunk in the gutter.  With every single message sent.  Even so, this is a step in the right direction by some good people at Google.

It is tragic that Mozilla has back-burnered Thunderbird, but on the plus side they don’t screw up the interface with pointless changes to justify otherwise irrelevant UX designers as does every idiotic change in Firefox with each release.  Hopefully the remaining community will rally around full integration of PGP following the astonishingly ironic lead of the privacy exploiting industry.

If keys were integrated into address books in every client and every corporate LDAP server, it would go a long way toward solving the valid annoyances with PGP key management; however, in my experience key management is never the sticking point, it is either key generation or the hassle of trying to deal with data rendered opaque and nearly useless by residual encryption of the data once it has reached me.

Forward Secrecy has a place.  It isn’t email.

A complaint levied against PGP that proves beyond any doubt that the complainant doesn’t understand the use case of PGP is that it doesn’t incorporate forward secrecy.  Forward secrecy is a consequence of a cryptosystem that negotiates a new key for each message thread which is not shared with the users and which the system doesn’t store.  By doing this, the correspondents cannot be forced to reveal the keys to decrypt the contents of stored or captured messages since they don’t know them.  Which also means they can’t access the contents of their stored messages because they’re encrypted with keys they don’t know.  You can’t read your own messages.  There are messaging modalities where such a “feature” isn’t crippling, but email isn’t one of them; sexting perhaps, but not email.

Indeed, the biggest, most annoying, most discouraging problem with PGP is that clients do not insert the unencrypted message into the local message store after decrypting it.  This forces the user to decrypt the message again each time they need to reference it, if they can ever find it again.  One of the problems with this is you can’t search encrypted messages without decrypting them.  No open source client I’m aware of has faced this debilitating failure of use awareness, though Symantec’s PGP desktop does (so it is solvable).  Being naive about message use wouldn’t have been surprising for the first few months of GPG’s general use, but that this failure persists after decades is somewhat shocking and frustrating.  It is my belief that the geekiness of most PGP interfaces has so limited use that most people (myself included) aren’t crippled by not being able to find PGP encrypted mail because we get so little of it.  If even a small percentage of our mail was encrypted, not ever being able to find it again would be a disaster and we’d stop using encryption.

This is really annoying because messages have the frequently intolerable drawbacks of being ephemeral without the cryptographic value of forward secrecy.

Email is normally used as a messaging modality of record.  It is the way in which we exchange contemplative comments and data that exceeds a sentence or so.  This capability remains important to almost all collaborative efforts.  The record thus created has archival value and is a fundamental requirement in many environments.  Maximizing the availability, searchability, and ease of recall of this archive is essential.  Indeed, even short form communication (“chat” in various forms), which is typically amenable to forward secrecy because of the generally low content value thus communicated, should have the option of PGP encryption instead of just OTR in order to create a secure but archival communications channel.

A modest proposal

I’ve been using PGP since the mid 1990s.  I have a key from early correspondence on PGP from 1997 and mine is from 1998.  Yet while I have about 2,967 contacts in my address book I have only 139 keys in my GPG keyring.  An adoption rate of 4.7% for encrypted email isn’t exactly a wild success.  I don’t think the problems are challenging and while I very much appreciate the emergence of cryptographically secure communications modalities such as OTR for chat and ZRTP for voice, I’ve been waiting for decades for easy-to-use secure email.  And yet, when people ask me to help them set up encrypted email, I generally tell them it is complicated, I’m willing to help them out, but they probably won’t end up using it.  Over the years, a few relatively easy to fix issues have retarded even my own use:

  • The fact that users have to find and install a somewhat complex plugin to handle encryption is daunting to the vast majority of users.  Enigmail is complicated enough that it is unusable without in-person walk-through support for most users.  Even phone support doesn’t get most people through setup. Basic GPG key generation and management should be built into the mail client.  Every time one sets up a new account, you should have to opt out of setting up a public key and there’s no reason for any options by default other than entering a password to protect the private key.
  • Key fields should be built into the address book of every mail client by default.  Any mail client that doesn’t support a public key field should be shamed and ridiculed.  That’s all of them until Gmail releases end-to-end as a default feature, though that may never happen as that breaks Google’s advertising model.  Remember, Google pays all their developers and buys them all lunch solely by selling your private data to advertisers.  That is their entire business model. They do not consider this “evil,” but you might.
  • I have no idea why my received encrypted mail is stored encrypted on my encrypted hard disk along with hundreds of thousands of unencrypted messages and tens of thousands of unencrypted documents.  Like any sensible person who takes a digital device out of the house (or leaves it unprotected in the house), I encrypt my local storage to protect those messages and documents from theft and exploitation.  My encrypted email messages are merely data cruft I can’t make much use of since I can’t search for them.  That’s idiotic and cripples the most important use modality of email: the persistent record. Any mail client should permanently decrypt the local message store unless the user specifically requests a message be stored encrypted, an option that should be the same for a message that arrived encrypted or unencrypted.
  • Once we solve the client storage failure and make encrypted email useful for something other than sending attachments (which you can save, ZOMG, in unencrypted form) and feeling clever for having gotten the magic decoder ring to work, then it would make sense to modify mail servers to encrypt all unencrypted incoming mail with the user’s public key, which mitigates a huge risk in having a mail server accessible on the internet: that the historical store of data there contained is remotely compromised.  This protects data at rest (data which is often, but not assuredly, already protected in transit by encrypted transport protocols.)  End-to-End encryption using shared public keys is still optimal, but leaving the mail store unencrypted at rest is an easily solved security failure and in protection in transit is largely solved (and would be quickly if gmail bounced any SMTP connection not protected by TLS 1.2+.)

Fixing the obvious usability flaws in encrypted email are fairly easy.  Public key cryptography in the form of PGP/GPG is an incredibly powerful and tremendously useful tool that has been hindered in uptake by limitations of perception and by overly stringent use cases that have created onerous limitations.  Adjusting the use model to match requirements would make PGP far more useful and far easier to convince people to use.

Phil Zimmerman’s essay “why I wrote PGP” applies today as much as it did in 1991:

What if everyone believed that law-abiding citizens should use postcards for their mail? If a nonconformist tried to assert his privacy by using an envelope for his mail, it would draw suspicion. Perhaps the authorities would open his mail to see what he’s hiding.

It has been almost 25 years and never has the need for universally encrypted mail been more obvious.  It is time to integrate PGP into all mail clients.

 

Posted at 14:39:09 UTC

Category: FreeBSDLinuxtechnology

Xabber now uses Orbot: OTR+Tor

Sunday, November 3, 2013 

As of Sept 30 2013, Xabber added Orbot support. This is a huge win for chat security. (Gibberbot has done this for a long time, but it isn’t as user-friendly or pretty as Xabber and it is hard to convince people to use it).

The combination of Xabber and Orbot solves the three most critical problems in chat privacy: obscuring what you say via message encryption, obscuring who you’re talking to via transport encryption, and obscuring what servers to subpoena for at least the last information by onion routing. OTR solves the first and Tor fixes the last two (SSL solves the middle one too, though Tor has a fairly secure SSL ciphersuite, who knows what that random SSL-enabled chat server uses – “none?”)

There’s a fly in the ointment of all this crypto: we’ve recently learned a few entirely predictable (and predicted) things about how communications are monitored:

1) All communications are captured and stored indefinitely. Nothing is ephemeral; neither a phone conversation nor an email, nor the web sites you visit. It is all stored and indexed should somebody sometime in the future decide that your actions are immoral or illegal or insidious or insufficiently respectful this record may be used to prove your guilt or otherwise tag you for punishment; who knows what clever future algorithms will be used in concert with big data and cloud services to identify and segregate the optimal scapegoat population for whatever political crises is thus most expediently deflected. Therefore, when you encrypt a conversation it has to be safe not just against current cryptanalytic attacks, but against those that might emerge before the sins of the present are sufficiently in the past to exceed the limitations of whatever entity is enforcing whatever rules. A lifetime is probably a safe bet. YMMV.

2) Those that specialize in snooping at the national scale have tools that aren’t available to the academic community and there are cryptanalytic attacks of unknown efficacy against some or all of the current cryptographic protocols. I heard someone who should know better poo poo the idea that the NSA might have better cryptographers than the commercial world because the commercial world pays better, as if the obsessive brilliance that defines a world-class cryptographer is motivated by remuneration. Not.

But you can still do better than nothing while understanding that a vulnerability to the NSA isn’t likely to be an issue for many, though if PRISM access is already being disseminated downstream to the DEA, it is only a matter of time before politically affiliated hate groups are trolling emails looking for evidence of moral turpitude with which to tar the unfaithful. Any complacency that might be engendered by not being a terrorist may be short lived. Enjoy it while it lasts.

And thus (assuming you have an Android device) you can download Xabber and Orbot. Xabber supports real OTR, not the fake-we-stole-your-acronym-for-our-marketing-good-luck-suing-us “OTR” that Google hugger-muggers and caromshotts you into believing your chats are ephemeral with (of course they and all their intelligence and commercial data mining partners store your chats, they just make it harder for your SO to read your flirty transgressions). Real OTR is a fairly strong, cryptographically secured protocol that transparently and securely negotiates a cryptographic key to secure each chat, which you never know and which is lost forever when the chat is over. There’s no open community way to recover your chat (that is, the NSA might be able to but we can’t). Sure, your chat partner can screen shot or copy-pasta the chat, but if you trust the person you’re chatting with and you aren’t a target of the NSA or DEA, your chat is probably secure.

But there’s still a flaw. You’re probably using Google. So anyone can just go to Google and ask them who you were chatting with, for how long, and about how many words you exchanged. The content is lost, but there’s a lot of meta-data there to play with.

So don’t use gchat if you care about that. It isn’t that hard to set up a chat server.

But maybe you’re a little concerned that your ISP not know who you’re chatting with. Given that your ISP (at the local or national level) might have a bluecoat device and could easily be man-in-the-middling every user on their network simultaneously, you might have reason to doubt Google’s SSL connection. While OTR still protects the content of your chat, an inexpensive bluecoat device renders the meta information visible to whoever along your coms path has bought one. This is where Tor comes in. While Google will still know (you’re still using Google even after they lied to you about PRISM and said, in court, that nobody using Gmail has any reasonable expectation of privacy?) your ISP (commercial or national) is going to have a very hard time figuring out that you’re even talking to Google, let alone with whom. Even the fact that you’re using chat is obscured.

So give Xabber a try. Check out Orbot, the effortless way to run it over Tor. And look into alternatives to cloud providers for everything you do.

Posted at 08:50:47 UTC

Category: FreeBSDself-publishingtechnology

Awesome SSL client cert fun

Tuesday, May 31, 2011 

Client cert authentication is oddly elusive given the practical value. I found a neat bug:

with
SSLVerifyClient optional
SSLVerifyDepth 3
SSLCADNRequestPath /usr/local/openssl/certs/clientcerts/

I get a request for identification in firefox, no problem. If I choose the right certificate to respond with I get an instant child pid 61501 exit signal Bus error (10). Every click on the “OK” button gets another seg fault. Yay. Magic.

client_cert.jpg

signal_bus_error.jpg
Posted at 00:36:09 UTC

Category: FreeBSDtechnology

OpenSSL 1.0.0_4 Install Issues

Sunday, January 16, 2011 

Updating my server’s install of OpenSSL on FreeBSD 8.1 to 1.0.0_4 (openssl-1.0.0c) I ran into a problem where some of the patch files had been updated but the distinfo file in /usr/ports/security/openssl hasn’t (hadn’t?) been updated to match.

The symptoms are that the update of OpenSSL fails with two errors:

  • tls-extractor.patch line count is 1235, distinfo says 1234,
  • dtls-sctp-20.patch SHA256 hash is wrong,
  • (the tls-extractor.patch hash is wrong too, but the line count hits first).

- SHA256 (openssl-1.0.0c/tls-extractor.patch) = bb1aa486327fd96f9d6b870f0a1ad2c83dd4c06a96284eb64dde3f833ba5e0d0
- SIZE (openssl-1.0.0c/tls-extractor.patch) = 1234
- SHA256 (openssl-1.0.0c/dtls-sctp-20.patch) = 3b451618b64d7dbc917942759c26cbc717be3077e9d73cb3c5bd12a82a132268
+ SHA256 (openssl-1.0.0c/tls-extractor.patch) = b7dfb15b6ab7d62348eaa191fc8ba06565c92ecdd5d08bb5e9eb01a2e7433bb2
+ SIZE (openssl-1.0.0c/tls-extractor.patch) = 1235
+ SHA256 (openssl-1.0.0c/dtls-sctp-20.patch) = f002b13fead7c08270a9cfaf556be49c62be5b46f492ad59db29af4d3e9a4e67

Posted at 19:28:58 UTC

Category: FreeBSDtechnology