Re: [bitcoin-dev] New Bitcoin Core macOS signing key

2018-01-31 Thread Cory Fields via bitcoin-dev 
A public key was published recently for future macOS releases. Sadly,
that key was created the wrong way (iPhone OS instead of macOS), so
another had to be generated.

The new, working pubkey for Bitcoin Core releases starting with
0.16.0rc1 is included in the message below. That message is signed
with the key mentioned in the previous mail.
It can be verified with: openssl smime -verify -noverify -in msg.pem

Sorry for the noise.

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Re: [bitcoin-dev] New Bitcoin Core macOS signing key

2018-01-12 Thread nullius via bitcoin-dev 

On 2018-01-12 at 08:54:12 +, Peter Todd  wrote:
While a clunky way to do it, you can use the `-signer` option to tell 
OpenSSL to write the signer's certificate to a file. That certificate 
can then be compared to the one from the repo, which was still in the 
repo as of the (signed!) v0.15.1 tag.



Fun fact: OpenTimestamps has git integration, which means you can 
extract a OTS proof from 2016 for that certificate from the repo:


   $ git checkout v0.15.1
   $ ots git-extract share/certs/BitcoinFoundation_Apple_Cert.pem 
share/certs/BitcoinFoundation_Apple_Cert.pem.ots 
36f60a5d5b1bc9a12b87d6475e3245b8236775e4
   $ ots verify share/certs/BitcoinFoundation_Apple_Cert.pem.ots
   Assuming target filename is 'share/certs/BitcoinFoundation_Apple_Cert.pem'
   Success! Bitcoin attests data existed as of Thu Oct 13 14:08:59 2016 EDT

Homework problem: write a paragraph explaining how the proof generated 
by the above three commands are crypto snakeoil that proved little. :)


It says, “Bitcoin attests data existed”.  Within the scope of those 
three commands, I don’t see any proof of who put it there.  Does OTS 
check the PGP signatures on *commits* when it does that `git-extract`?  
The signature on the v0.15.1 tag is irrelevant to that question; and 
FWIW, I don’t see *that* signature being verified here, either.  

Second paragraph:  Moreover, with the breaking of SHA-1, it *may* be 
feasible for some scenario to play out involving two different PEMs with 
the same hash, but different public keys (and thus different 
corresponding private keys).  I don’t know off the top of my head if 
somewhere could be found to stash the magic bits; and the overall 
scenario would need to be a bit convoluted.  I think a malicious 
committer who lacked access to the signing key *may* be able to create a 
collision between the real certificate, and a certificate as for which 
he has the private key—then switch them, later.  Maybe.  I would not 
discount the possibility off-hand.  OTS would prove nothing, if he had 
the foresight to obtain timestamps proving that both certificates 
existed at the appropriate time (which they would need to anyway; it is 
not a post facto preimage attack).



[...]

What's nice about OpenPGP's "clearsigned" format is how it ignores 
whitespace; a replica of that might be a nice thing for OTS to be able 
to do too. Though that's on low priority, as there's some tricky design 
choices(1) to be made about how to nicely nest clearsigned PGP within 
OTS.



1) For example, I recently found a security hole related to clearsigned 
PGP recently. Basically the issue was that gpg --verify will return 
true on a file that looks like the following:


   1d7a363ce12430881ec56c9cf1409c49c491043618e598c356e2959040872f5a  
foo-v2.0.tar.gz
   -BEGIN PGP SIGNED MESSAGE-
   Hash: SHA256

   e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855  
foo-v1.0.tar.gz
   -BEGIN PGP SIGNATURE-

   
   -END PGP SIGNATURE-

The system I was auditing then did something like this to verify that 
the file was signed:


   set -e # exit immediately on error
   gpg --verify SHA256SUMS.asc
   cat SHA256SUMS.asc | grep foo-v2.0.tar.gz
   

While it makes it a bit less user friendly, the fact that PKCS7's 
encoding made it impossible to see the message you signed until it's 
been properly verified is a good thing re: security.


Potential solutions using PGP:

0. Don’t use clearsigning.

1. Use a detached signature.

2. Use `gpg --verify -o -` and pipe that to `grep`, rather than 
illogically separating verification from use of data.  (By the way, 
where is the *hash* verified?  Was `grep` piped to `sha256sum -c`?)


3. Have shell scripts written by somebody who knows how to think about 
security, and/or who knows how to RTFM; quoting gpg(1):


Note: When verifying a cleartext signature, gpg verifies only what  
makes up the cleartext signed data and not any extra data outside of 
the cleartext signature or the header lines directly following the dash 
marker line.  The option --output may be used to write out the actual 
signed data, but there are other pitfalls with this format as well.  It 
is suggested to avoid cleartext signatures in favor of detached 
signatures.


4. Obtain an audit from Peter Todd.

And yes, I checked: Bitcoin Core's contrib/verifybinaries/verify.sh 
isn't vulnerable to this mistake. :)


P.S., oh my!  *Unsigned data:*


___
bitcoin-dev mailing list
bitcoin-dev@lists.linuxfoundation.org
https://lists.linuxfoundation.org/mailman/listinfo/bitcoin-dev


--
null...@nym.zone | PGP ECC: 0xC2E91CD74A4C57A105F6C21B5A00591B2F307E0C
Bitcoin: bc1qcash96s5jqppzsp8hy8swkggf7f6agex98an7h | (Segwit nested:
3NULL3ZCUXr7RDLxXeLPDMZDZYxuaYkCnG)  (PGP RSA: 0x36EBB4AB699A10EE)
“‘If you’re not doing anything wrong, you have nothing to hide.’
No!  Because I do nothing wrong, I have nothing to show.” — nullius


signature.asc

[bitcoin-dev] New Bitcoin Core macOS signing key

2018-01-11 Thread Cory Fields via bitcoin-dev 
Hi all

As discussed in a few of the last weekly meetings, Bitcoin Core's
macOS code signing certificate expired today.

We are (Greg is ;) in the process of establishing a new threshold
signing scheme that will allow us to handle code signing without any
single point of failure. But until then, releases will be signed as
before, just with a new certificate.

As a matter of record, I used the old code-signing key/certificate to
sign a message containing the pubkey that matches the new
key/certificate. It's attached at the end of this message.

The pkcs7 format is rather clunky, but I wanted to include the current
signing certificate to make verification easier. I'll leave it to the
reader to extract the certificate from a previous release in order to
make sure that they match. It was also in the Core git repo until it
was removed recently.

To verify, you can use something like:
openssl smime -verify -in sig.pkcs7 -inform pem -ignore_critical -purpose any

- "ignore_critical" setting tells openssl to ignore the Apple-specific
critical extensions that it doesn't understand.
- "-purpose any" allows the "purpose == smimesign" check to be
skipped. This would otherwise fail because this certificate is only
authorized to sign code, not arbitrary messages.

By now, the signature will probably fail to validate because the
certificate has expired.

The signed message below is timestamped on the Bitcoin blockchain
using OpenTimestamps. See the attached ots file containing the
timestamp proof. If the attachment gets scrubbed and doesn't make it
to the list, don't be afraid to nag Peter Todd about a mail-friendly
format for these proofs :)

Regards,
Cory

expire.txt.sig:
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