freebsd stable - Mar 2016 - svn commit: r296462 - in stable/9: crypto/openssl/crypto/bio crypto/openssl/crypto/bn crypto/openssl/doc/apps crypto/openssl/ssl secure/usr.bin/openssl/man

On 3/8/2016 1:13 PM, Craig Green wrote:
> 
> 
> On 2016-03-08 7:45 AM, Mike Tancsa wrote:
>> Hi,
>>     I tried on 2 separate boxes, and sshd segfaults when this rev is
>> applied
>>
>>     ---Mike
> 
> Just adding some debug logs showing a couple places where sshd exited.
> Encryption algorithm, kex and hmac didn't seem to matter.
Here is an example of where sshd chokes

good trace - pre openssl commit
....
debug2: kex_parse_kexinit:
hmac-sha1,hmac-sha1-96,hmac-md5,hmac-md5-96,umac-64 at openssh.com [preauth]
debug2: kex_parse_kexinit:
hmac-sha1,hmac-sha1-96,hmac-md5,hmac-md5-96,umac-64 at openssh.com [preauth]
debug2: kex_parse_kexinit: none [preauth]
debug2: kex_parse_kexinit: none [preauth]
debug2: kex_parse_kexinit:  [preauth]
debug2: kex_parse_kexinit:  [preauth]
debug2: kex_parse_kexinit: first_kex_follows 0  [preauth]
debug2: kex_parse_kexinit: reserved 0  [preauth]
debug2: mac_setup: setup hmac-sha1 [preauth]
debug1: kex: client->server aes256-ctr hmac-sha1 none [preauth]
debug2: mac_setup: setup hmac-sha1 [preauth]
debug1: kex: server->client aes256-ctr hmac-sha1 none [preauth]
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST received [preauth]
debug3: mm_request_send entering: type 0 [preauth]
debug3: mm_request_receive entering
debug3: monitor_read: checking request 0
debug3: mm_answer_moduli: got parameters: 1024 2048 2048
debug3: mm_request_send entering: type 1
debug2: monitor_read: 0 used once, disabling now
debug3: mm_choose_dh: waiting for MONITOR_ANS_MODULI [preauth]
debug3: mm_request_receive_expect entering: type 1 [preauth]
debug3: mm_request_receive entering [preauth]
debug3: mm_choose_dh: remaining 0 [preauth]
*debug1: SSH2_MSG_KEX_DH_GEX_GROUP sent [preauth]*
*debug2: bits set: 1063/2048 [preauth]*
debug1: expecting SSH2_MSG_KEX_DH_GEX_INIT [preauth]
debug2: bits set: 1041/2048 [preauth]
debug3: mm_key_sign entering [preauth]
debug3: mm_request_send entering: type 6 [preauth]
debug3: mm_request_receive entering
debug3: monitor_read: checking request 6
debug3: mm_answer_sign
debug3: mm_answer_sign: signature 0x8034173c0(55)
debug3: mm_request_send entering: type 7
debug2: monitor_read: 6 used once, disabling now
debug3: mm_key_sign: waiting for MONITOR_ANS_SIGN [preauth]



bad trace - with openssl commit.

debug1: SSH2_MSG_KEX_DH_GEX_REQUEST received [preauth]
debug3: mm_request_send entering: type 0 [preauth]
debug3: mm_choose_dh: waiting for MONITOR_ANS_MODULI [preauth]
debug3: mm_request_receive_expect entering: type 1 [preauth]
debug3: mm_request_receive entering [preauth]
debug3: mm_request_receive entering
debug3: monitor_read: checking request 0
debug3: mm_answer_moduli: got parameters: 1024 2048 2048
debug3: mm_request_send entering: type 1
debug2: monitor_read: 0 used once, disabling now
debug3: mm_choose_dh: remaining 0 [preauth]
*debug1: SSH2_MSG_KEX_DH_GEX_GROUP sent [preauth]*
debug1: monitor_read_log: child log fd closed
debug3: mm_request_receive entering
debug1: do_cleanup
debug3: PAM: sshpam_thread_cleanup entering
debug1: Killing privsep child 1837



-- 
-------------------
Mike Tancsa, tel +1 519 651 3400
Sentex Communications, mike at sentex.net
Providing Internet services since 1994 www.sentex.net
Cambridge, Ontario Canada   http://www.tancsa.com/

Mike Tancsa <mike at sentex.net> writes:

Hi,
> good trace - pre openssl commit
> ....
> debug2: kex_parse_kexinit:
> hmac-sha1,hmac-sha1-96,hmac-md5,hmac-md5-96,umac-64 at openssh.com
[preauth]
> debug2: kex_parse_kexinit:
> hmac-sha1,hmac-sha1-96,hmac-md5,hmac-md5-96,umac-64 at openssh.com
[preauth]
> debug2: kex_parse_kexinit: none [preauth]
> debug2: kex_parse_kexinit: none [preauth]
> debug2: kex_parse_kexinit:  [preauth]
> debug2: kex_parse_kexinit:  [preauth]
> debug2: kex_parse_kexinit: first_kex_follows 0  [preauth]
> debug2: kex_parse_kexinit: reserved 0  [preauth]
> debug2: mac_setup: setup hmac-sha1 [preauth]
> debug1: kex: client->server aes256-ctr hmac-sha1 none [preauth]
> debug2: mac_setup: setup hmac-sha1 [preauth]
> debug1: kex: server->client aes256-ctr hmac-sha1 none [preauth]
> debug1: SSH2_MSG_KEX_DH_GEX_REQUEST received [preauth]
> debug3: mm_request_send entering: type 0 [preauth]
> debug3: mm_request_receive entering
> debug3: monitor_read: checking request 0
> debug3: mm_answer_moduli: got parameters: 1024 2048 2048
> bad trace - with openssl commit.
>
> debug1: SSH2_MSG_KEX_DH_GEX_REQUEST received [preauth]
> debug3: mm_request_send entering: type 0 [preauth]
> debug3: mm_choose_dh: waiting for MONITOR_ANS_MODULI [preauth]
> debug3: mm_request_receive_expect entering: type 1 [preauth]
> debug3: mm_request_receive entering [preauth]
> debug3: mm_request_receive entering
> debug3: monitor_read: checking request 0
> debug3: mm_answer_moduli: got parameters: 1024 2048 2048
> debug3: mm_request_send entering: type 1
> debug2: monitor_read: 0 used once, disabling now
> debug3: mm_choose_dh: remaining 0 [preauth]
> *debug1: SSH2_MSG_KEX_DH_GEX_GROUP sent [preauth]*
> debug1: monitor_read_log: child log fd closed
> debug3: mm_request_receive entering
> debug1: do_cleanup
> debug3: PAM: sshpam_thread_cleanup entering
> debug1: Killing privsep child 1837
Similar symptoms on 9.3-p37 when trying to connect with putty from a Win
7 station.

Using cygwin's openssh client doesn't trigger the issue.

?ric Masson

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