Bug 3249

Summary:	openssh support for openssl 3.0 (alpha 6)
Product:	Portable OpenSSH	Reporter:	rajesh satya <rajesh.satya>
Component:	sshd	Assignee:	Assigned to nobody <unassigned-bugs>
Status:	CLOSED DUPLICATE
Severity:	major	CC:	djm, mkl
Priority:	P5
Version:	8.4p1
Hardware:	Other
OS:	Linux

Description rajesh satya 2021-01-05 23:45:28 AEDT

After upgrade to openssl 3.0 (alpha 6), openssh login fails.

Bad Packet length: 1868080485
debug3: send packet type 1
ssh_dispatch_run_fatal: connection to <IP> port 22: connection corrupted

I enabled debug logging to DEBUG3, but this is the only failure message i am seeing.

Openssh version: 8.4p1
openssl version: 3.0.0-alpha6

If there is already a plan to support openssl 3.0, kindly share

Comment 1 rajesh satya 2021-01-06 17:52:26 AEDT

Some debugging logs:

sshd[1088]: debug1: SSH2_MSG_NEWKEYS sent [preauth]
sshd[1088]: debug1: expecting SSH2_MSG_NEWKEYS [preauth]
sshd[1088]: debug3: receive packet: type 21 [preauth]
sshd[1088]: debug1: SSH2_MSG_NEWKEYS received [preauth]
sshd[1088]: debug2: set_newkeys: mode 0 [preauth]
sshd[1088]: debug1: rekey in after 4294967296 blocks [preauth]
sshd[1088]: debug1: KEX done [preauth]
sshd[1088]: debug3: receive packet: type 5 [preauth]
sshd[1088]: debug3: send packet: type 6 [preauth]
sshd[1088]: Connection closed by <IP> port 48946 [preauth]   ---> error happening here
sshd[1088]: debug1: do_cleanup [preauth]
sshd[1088]: debug3: PAM: sshpam_thread_cleanup entering [preauth]
sshd[1088]: debug1: monitor_read_log: child log fd closed

With openssl 1.1.1g/1.1.1i, it was working fine.
Problem with openssl-3.0.0 (tried alpha6)

Kindly suggest.

Comment 2 Damien Miller 2021-01-07 14:08:58 AEDT

We're waiting for OpenSSL to rename an incompatible API

https://github.com/openssl/openssl/issues/13411

Until then, please consider OpenSSL 3.* unsupported by OpenSSH.

Comment 3 Damien Miller 2021-01-08 13:11:29 AEDT


*** This bug has been marked as a duplicate of bug 3238 ***

Comment 4 Marc Kleine-Budde 2021-01-08 19:14:45 AEDT

Hey rajesh,

a recent openssl + patch "v2" from https://bugzilla.mindrot.org/show_bug.cgi?id=3238 works for me.

Comment 5 rajesh satya 2021-01-08 20:05:57 AEDT

I tried the same of v2 patch, the issue still persists.

Comment 6 Marc Kleine-Budde 2021-01-08 23:59:24 AEDT

Forgot to mention, that chacha20 is broken, too. Make sure to use recent openssl together with my patches:

https://github.com/marckleinebudde/openssh-portable/tree/workaround-openssl-3

Comment 7 Damien Miller 2021-03-04 09:51:38 AEDT

close bugs that were resolved in OpenSSH 8.5 release cycle