Call for testing: OpenSSH 8.0

Adam Eijdenberg adam at continusec.com
Fri Mar 29 16:46:09 AEDT 2019 

On Wed, Mar 27, 2019 at 10:04 PM Damien Miller <djm at mindrot.org> wrote:
>
> OpenSSH 8.0p1 is almost ready for release, so we would appreciate testing
> on as many platforms and systems as possible.
>
> Snapshot releases for portable OpenSSH are available from
> http://www.mindrot.org/openssh_snap/

Hi Damien,

I pull today's snapshot from the link above onto an Ubuntu 18.04.2 and
was able to successfully build and run the regression tests.

I then tried to use the new ssh binary to connect to one of our
production servers (which run OpenSSH_7.4p1) and observed an error
connecting, after authentication appeared to succeed.

$ ./ssh -p 4444 ec2-user at our.server.in.the.cloud
client_loop: Broken pipe

When I execute the same command with the built-in SSH (OpenSSH_7.6p1)
it succeeds.

If relevant, we use short-lived RSA certificates that are in our local
SSH agent, and the private keys are not written to disk.

Full verbose output below - I've changed the server names / IPs / port
numbers a little but otherwise as is:

$ ssh-add -L
ssh-rsa AA...AN /home/me/.ssh/id_rsa
ssh-rsa-cert-v01 at openssh.com AAAAH...MJskQ== id_dtacld_shortlived_rsa

$ ./ssh -vvv -p 4444 ec2-user at our.server.in.the.cloud
OpenSSH_7.9p1-snap20190329, OpenSSL 1.1.0g  2 Nov 2017
debug2: resolving "our.server.in.the.cloud" port 4444
debug2: ssh_connect_direct
debug1: Connecting to our.server.in.the.cloud [our.ip.in.the.cloud] port 4444.
debug1: Connection established.
debug1: identity file /home/me/.ssh/id_rsa type 0
debug1: identity file /home/me/.ssh/id_rsa-cert type -1
debug1: identity file /home/me/.ssh/id_dsa type -1
debug1: identity file /home/me/.ssh/id_dsa-cert type -1
debug1: identity file /home/me/.ssh/id_ecdsa type -1
debug1: identity file /home/me/.ssh/id_ecdsa-cert type -1
debug1: identity file /home/me/.ssh/id_ed25519 type -1
debug1: identity file /home/me/.ssh/id_ed25519-cert type -1
debug1: identity file /home/me/.ssh/id_xmss type -1
debug1: identity file /home/me/.ssh/id_xmss-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_7.9
debug1: Remote protocol version 2.0, remote software version OpenSSH_7.4
debug1: match: OpenSSH_7.4 pat
OpenSSH_7.0*,OpenSSH_7.1*,OpenSSH_7.2*,OpenSSH_7.3*,OpenSSH_7.4*,OpenSSH_7.5*,OpenSSH_7.6*,OpenSSH_7.7*
compat 0x04000002
debug2: fd 3 setting O_NONBLOCK
debug1: Authenticating to our.server.in.the.cloud:4444 as 'ec2-user'
debug3: put_host_port: [our.server.in.the.cloud]:4444
debug3: hostkeys_foreach: reading file "/home/me/.ssh/known_hosts"
debug3: send packet: type 20
debug1: SSH2_MSG_KEXINIT sent
debug3: receive packet: type 20
debug1: SSH2_MSG_KEXINIT received
debug2: local client KEXINIT proposal
debug2: KEX algorithms:
curve25519-sha256,curve25519-sha256 at libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1,ext-info-c
debug2: host key algorithms:
ecdsa-sha2-nistp256-cert-v01 at openssh.com,ecdsa-sha2-nistp384-cert-v01 at openssh.com,ecdsa-sha2-nistp521-cert-v01 at openssh.com,ssh-ed25519-cert-v01 at openssh.com,rsa-sha2-512-cert-v01 at openssh.com,rsa-sha2-256-cert-v01 at openssh.com,ssh-rsa-cert-v01 at openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-ed25519,rsa-sha2-512,rsa-sha2-256,ssh-rsa
debug2: ciphers ctos:
chacha20-poly1305 at openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm at openssh.com,aes256-gcm at openssh.com
debug2: ciphers stoc:
chacha20-poly1305 at openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm at openssh.com,aes256-gcm at openssh.com
debug2: MACs ctos:
umac-64-etm at openssh.com,umac-128-etm at openssh.com,hmac-sha2-256-etm at openssh.com,hmac-sha2-512-etm at openssh.com,hmac-sha1-etm at openssh.com,umac-64 at openssh.com,umac-128 at openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc:
umac-64-etm at openssh.com,umac-128-etm at openssh.com,hmac-sha2-256-etm at openssh.com,hmac-sha2-512-etm at openssh.com,hmac-sha1-etm at openssh.com,umac-64 at openssh.com,umac-128 at openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,zlib at openssh.com,zlib
debug2: compression stoc: none,zlib at openssh.com,zlib
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug2: peer server KEXINIT proposal
debug2: KEX algorithms:
curve25519-sha256,curve25519-sha256 at libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
debug2: host key algorithms:
ssh-rsa,rsa-sha2-512,rsa-sha2-256,ecdsa-sha2-nistp256,ecdsa-sha2-nistp256-cert-v01 at openssh.com,ssh-ed25519
debug2: ciphers ctos:
chacha20-poly1305 at openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm at openssh.com,aes256-gcm at openssh.com,aes128-cbc,aes192-cbc,aes256-cbc,blowfish-cbc,cast128-cbc,3des-cbc
debug2: ciphers stoc:
chacha20-poly1305 at openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm at openssh.com,aes256-gcm at openssh.com,aes128-cbc,aes192-cbc,aes256-cbc,blowfish-cbc,cast128-cbc,3des-cbc
debug2: MACs ctos:
umac-64-etm at openssh.com,umac-128-etm at openssh.com,hmac-sha2-256-etm at openssh.com,hmac-sha2-512-etm at openssh.com,hmac-sha1-etm at openssh.com,umac-64 at openssh.com,umac-128 at openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc:
umac-64-etm at openssh.com,umac-128-etm at openssh.com,hmac-sha2-256-etm at openssh.com,hmac-sha2-512-etm at openssh.com,hmac-sha1-etm at openssh.com,umac-64 at openssh.com,umac-128 at openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,zlib at openssh.com
debug2: compression stoc: none,zlib at openssh.com
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug1: kex: algorithm: curve25519-sha256
debug1: kex: host key algorithm: ecdsa-sha2-nistp256-cert-v01 at openssh.com
debug1: kex: server->client cipher: chacha20-poly1305 at openssh.com MAC:
<implicit> compression: none
debug1: kex: client->server cipher: chacha20-poly1305 at openssh.com MAC:
<implicit> compression: none
debug3: send packet: type 30
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug3: receive packet: type 31
debug1: Server host certificate:
ecdsa-sha2-nistp256-cert-v01 at openssh.com
SHA256:AH8vtFSfhKUE41ankmoB/tpo9Duxe7ZHA5S1sja36Fk, serial 0 ID
"our.server.in.the.cloud" CA ssh-rsa
SHA256:QtxnpSvhjow+Z68+z5VMnNGitHHc+nkoDMiJM0C+JtM valid from
2019-03-29T11:00:01 to 2019-03-30T11:00:01
debug2: Server host certificate hostname: our.server.in.the.cloud
debug3: put_host_port: [our.ip.in.the.cloud]:4444
debug3: put_host_port: [our.server.in.the.cloud]:4444
debug3: hostkeys_foreach: reading file "/home/me/.ssh/known_hosts"
debug1: checking without port identifier
debug3: hostkeys_foreach: reading file "/home/me/.ssh/known_hosts"
debug3: record_hostkey: found ca key type RSA in file
/home/me/.ssh/known_hosts:11
debug3: load_hostkeys: loaded 1 keys from our.server.in.the.cloud
debug1: Host 'our.server.in.the.cloud' is known and matches the
ECDSA-CERT host certificate.
debug1: Found CA key in /home/me/.ssh/known_hosts:11
debug1: found matching key w/out port
debug3: send packet: type 21
debug2: set_newkeys: mode 1
debug1: rekey out after 134217728 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug3: receive packet: type 21
debug1: SSH2_MSG_NEWKEYS received
debug2: set_newkeys: mode 0
debug1: rekey in after 134217728 blocks
debug1: Will attempt key: /home/me/.ssh/id_rsa RSA
SHA256:jFWK2zuc3SuLroIcpk/awobdgD43pu0G9iWtst1lLzg agent
debug1: Will attempt key: id_dtacld_shortlived_rsa RSA-CERT
SHA256:AeEypypDIQ7DXiFtXfpEGmNZHHSpDoD9Hppg+YzU+O0 agent
debug1: Will attempt key: /home/me/.ssh/id_dsa
debug1: Will attempt key: /home/me/.ssh/id_ecdsa
debug1: Will attempt key: /home/me/.ssh/id_ed25519
debug1: Will attempt key: /home/me/.ssh/id_xmss
debug2: pubkey_prepare: done
debug3: send packet: type 5
debug3: receive packet: type 7
debug1: SSH2_MSG_EXT_INFO received
debug1: kex_input_ext_info: server-sig-algs=<rsa-sha2-256,rsa-sha2-512>
debug3: receive packet: type 6
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug3: send packet: type 50
debug3: receive packet: type 51
debug1: Authentications that can continue: publickey
debug3: start over, passed a different list publickey
debug3: preferred publickey,keyboard-interactive,password
debug3: authmethod_lookup publickey
debug3: remaining preferred: keyboard-interactive,password
debug3: authmethod_is_enabled publickey
debug1: Next authentication method: publickey
debug1: Offering public key: /home/me/.ssh/id_rsa RSA
SHA256:jFWK2zuc3SuLroIcpk/awobdgD43pu0G9iWtst1lLzg agent
debug3: send packet: type 50
debug2: we sent a publickey packet, wait for reply
debug3: receive packet: type 51
debug1: Authentications that can continue: publickey
debug1: Offering public key: id_dtacld_shortlived_rsa RSA-CERT
SHA256:AeEypypDIQ7DXiFtXfpEGmNZHHSpDoD9Hppg+YzU+O0 agent
debug3: send packet: type 50
debug2: we sent a publickey packet, wait for reply
debug3: receive packet: type 60
debug1: Server accepts key: id_dtacld_shortlived_rsa RSA-CERT
SHA256:AeEypypDIQ7DXiFtXfpEGmNZHHSpDoD9Hppg+YzU+O0 agent
debug3: sign_and_send_pubkey: RSA-CERT
SHA256:AeEypypDIQ7DXiFtXfpEGmNZHHSpDoD9Hppg+YzU+O0
debug1: sign_and_send_pubkey: no separate private key for certificate
"id_dtacld_shortlived_rsa"
debug3: sign_and_send_pubkey: signing using ssh-rsa-cert-v01 at openssh.com
debug3: send packet: type 50
debug3: receive packet: type 52
debug1: Authentication succeeded (publickey).
Authenticated to our.server.in.the.cloud ([our.ip.in.the.cloud]:4444).
debug1: channel 0: new [client-session]
debug3: ssh_session2_open: channel_new: 0
debug2: channel 0: send open
debug3: send packet: type 90
debug1: Requesting no-more-sessions at openssh.com
debug3: send packet: type 80
debug1: Entering interactive session.
debug1: pledge: network
debug3: receive packet: type 80
debug1: client_input_global_request: rtype hostkeys-00 at openssh.com want_reply 0
debug3: receive packet: type 91
debug2: channel_input_open_confirmation: channel 0: callback start
debug2: fd 3 setting TCP_NODELAY
debug3: ssh_packet_set_tos: set IP_TOS 0x48
debug2: client_session2_setup: id 0
debug2: channel 0: request pty-req confirm 1
debug3: send packet: type 98
debug2: channel 0: request shell confirm 1
debug3: send packet: type 98
debug2: channel_input_open_confirmation: channel 0: callback done
debug2: channel 0: open confirm rwindow 0 rmax 32768
debug3: send packet: type 1
client_loop: Broken pipe

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