[openssl-dev] In ssl3_write_bytes, some checks related to hanlding write failure are missing
Raja ashok
raja.ashok at huawei.com
Wed Apr 5 04:59:52 UTC 2017
Hi Matt,
I created a Pull request for the second change on master, 1.0.2 and 1.1.0. I am creating PR in github for the first time, so if anything else I missed please update me.
https://github.com/openssl/openssl/pull/3124
https://github.com/openssl/openssl/pull/3123
https://github.com/openssl/openssl/pull/3122
Regards,
Ashok
Raja Ashok V K
Huawei Technologies
Bangalore, India
http://www.huawei.com
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-----Original Message-----
From: openssl-dev [mailto:openssl-dev-bounces at openssl.org] On Behalf Of Matt Caswell
Sent: 03 April 2017 14:40
To: openssl-dev at openssl.org
Subject: Re: [openssl-dev] In ssl3_write_bytes, some checks related to hanlding write failure are missing
On 31/03/17 18:54, Raja ashok wrote:
> Hi All,
>
>
>
> In ssl3_write_bytes, if (len < tot) we are returning failure with
> SSL_R_BAD_LENGTH error. In this place I hope we should set “tot” back
> to “s->s3->wnum”. Otherwise when application calls back SSL_write with
> correct buffer, it causes serious problem (“tot” is 0 and iLeft is not
> NULL). I hope we should do like below.
>
>
>
> if (len < tot) {
>
> s->s3->wnum = tot;
>
> SSLerr(SSL_F_SSL3_WRITE_BYTES, SSL_R_BAD_LENGTH);
>
> return (-1);
>
> }
This is 1.0.2 code. The check appears to be earlier in master/1.1.0 (before wnum is reset) and so this isn't an issue there. Really, if an application passes a bad len value, then this is an application bug and shouldn't ever happen in a well-behaved application. I'm not sure you could really describe this as an OpenSSL bug (its a bit border line) so I'm not sure it justifies a patch to 1.0.2 (which only takes bug fixes).
>
> And also we should do one additional check for “len” as mentioned in
> my previous mail.
>
>
>
> if ((len < tot) || ((tot != 0) && (len < (tot +
> s->s3->wpend_tot)))){
>
> s->s3->wnum = tot;
>
> SSLerr(SSL_F_SSL3_WRITE_BYTES, SSL_R_BAD_LENGTH);
>
> return (-1);
>
> }
Please could you raise a github pull request for this suggestion? You will probably need two versions: one targeting master and one targeting
1.0.2 as the the code looks a little different in this area.
Matt
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