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Date:      Wed, 10 Feb 2021 14:30:34 +0800
From:      PstreeM China <pstreem@gmail.com>
To:        Doug McIntyre <merlyn@geeks.org>
Cc:        "freebsd-questions@freebsd.org" <freebsd-questions@freebsd.org>
Subject:   Re: Permission denied via ssh over ipv6
Message-ID:  <CAPDFJPjL8EdVfeH43=35cLxRGyE388JYY9qD5JB=gsdwhTh6ag@mail.gmail.com>
In-Reply-To: <YCNsdWk019SBpLdg@geeks.org>
References:  <CAPDFJPjF19_9kRG0ff5r0cmD=-GpnYjdZNaCTyJEj-Bogw0qEw@mail.gmail.com> <YCNsdWk019SBpLdg@geeks.org>

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hi:

thanks for your quickly reply.
ssh -vvv log as below, we can see the connection has already established,
but after input the password, it's not work..
i'am sure the password is right, try modify the passwd has the same issue.

about the DNS PTRs, how should i do ? the source is my home pc, not have
DNS domain.

--------------------------------
rpi% ssh myuser@2607:f130::6287 -vvv
OpenSSH_7.9p1, OpenSSL 1.1.1h-freebsd  22 Sep 2020
debug1: Reading configuration data /etc/ssh/ssh_config
debug2: resolve_canonicalize: hostname 2607:f130::6287 is address
debug2: ssh_connect_direct
debug1: Connecting to 2607:f130::6287 [2607:f130::6287] port 22.
debug1: Connection established.
debug1: identity file /home/myuser/.ssh/id_rsa type 0
debug1: identity file /home/myuser/.ssh/id_rsa-cert type -1
debug1: identity file /home/myuser/.ssh/id_dsa type -1
debug1: identity file /home/myuser/.ssh/id_dsa-cert type -1
debug1: identity file /home/myuser/.ssh/id_ecdsa type -1
debug1: identity file /home/myuser/.ssh/id_ecdsa-cert type -1
debug1: identity file /home/myuser/.ssh/id_ed25519 type -1
debug1: identity file /home/myuser/.ssh/id_ed25519-cert type -1
debug1: identity file /home/myuser/.ssh/id_xmss type -1
debug1: identity file /home/myuser/.ssh/id_xmss-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_7.9 FreeBSD-20200214
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 2607:f130::6287:22 as 'myuser'
debug3: Fssh_hostkeys_foreach: reading file "/home/myuser/.ssh/known_hosts"
debug3: Fssh_record_hostkey: found key type ECDSA in file
/home/myuser/.ssh/known_hosts:21
debug3: Fssh_load_hostkeys: loaded 1 keys from 2607:f130::6287
debug3: order_hostkeyalgs: prefer hostkeyalgs:
ecdsa-sha2-nistp256-cert-v01@openssh.com,
ecdsa-sha2-nistp384-cert-v01@openssh.com
,ecdsa-sha2-nistp521-cert-v01@openssh.
 com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521
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@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,d

 iffie-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@openssh.com,
ecdsa-sha2-nistp384-cert-v01@openssh.com,
ecdsa-sha2-nistp521-cert-v01@openssh.com,ecdsa-sha2-nis
         tp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,
ssh-ed25519-cert-v01@openssh.com,rsa-sha2-512-cert-v01@openssh.com,
rsa-sha2-256-cert-v01@openssh.com,ssh-rsa-cert-v01@op
       enssh.com,ssh-ed25519,rsa-sha2-512,rsa-sha2-256,ssh-rsa
debug2: ciphers ctos: chacha20-poly1305@openssh.com
,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,
aes256-gcm@openssh.com,aes128-cbc,aes192-cbc,aes256-cbc
debug2: ciphers stoc: chacha20-poly1305@openssh.com
,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,
aes256-gcm@openssh.com,aes128-cbc,aes192-cbc,aes256-cbc
debug2: MACs ctos: umac-64-etm@openssh.com,umac-128-etm@openssh.com,
hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,
hmac-sha1-etm@openssh.com,umac-64@open                              ssh.com,
umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: umac-64-etm@openssh.com,umac-128-etm@openssh.com,
hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,
hmac-sha1-etm@openssh.com,umac-64@open                              ssh.com,
umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,zlib@openssh.com,zlib
debug2: compression stoc: none,zlib@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@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,d

 iffie-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,ssh-ed25519
debug2: ciphers ctos: chacha20-poly1305@openssh.com
,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,
aes256-gcm@openssh.com,aes128-cbc,aes192-cbc,aes256-cbc,bl
             owfish-cbc,cast128-cbc,3des-cbc
debug2: ciphers stoc: chacha20-poly1305@openssh.com
,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,
aes256-gcm@openssh.com,aes128-cbc,aes192-cbc,aes256-cbc,bl
             owfish-cbc,cast128-cbc,3des-cbc
debug2: MACs ctos: umac-64-etm@openssh.com,umac-128-etm@openssh.com,
hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,
hmac-sha1-etm@openssh.com,umac-64@open                              ssh.com,
umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: umac-64-etm@openssh.com,umac-128-etm@openssh.com,
hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,
hmac-sha1-etm@openssh.com,umac-64@open                              ssh.com,
umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,zlib@openssh.com
debug2: compression stoc: none,zlib@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
debug1: kex: server->client cipher: chacha20-poly1305@openssh.com MAC:
<implicit> compression: none
debug1: kex: client->server cipher: chacha20-poly1305@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 key: ecdsa-sha2-nistp256
SHA256:9b7zNAYeCT72LITVCmeGsXsT5IEsPWXh0FGtzIaR7rw
debug3: verify_host_key_dns
debug1: skipped DNS lookup for numerical hostname
debug3: Fssh_hostkeys_foreach: reading file "/home/myuser/.ssh/known_hosts"
debug3: Fssh_record_hostkey: found key type ECDSA in file
/home/myuser/.ssh/known_hosts:21
debug3: Fssh_load_hostkeys: loaded 1 keys from 2607:f130::6287
debug1: Host '2607:f130::6287' is known and matches the ECDSA host key.
debug1: Found key in /home/myuser/.ssh/known_hosts:21
debug3: send packet: type 21
debug2: set_newkeys: mode 1
debug1: rekey 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 after 134217728 blocks
debug1: Will attempt key: /home/myuser/.ssh/id_rsa RSA
SHA256:uJkEs7DCUCz5Rsn8sSrWFEeJo8VSHZRRkDKrER8Obic
debug1: Will attempt key: /home/myuser/.ssh/id_dsa
debug1: Will attempt key: /home/myuser/.ssh/id_ecdsa
debug1: Will attempt key: /home/myuser/.ssh/id_ed25519
debug1: Will attempt key: /home/myuser/.ssh/id_xmss
debug2: pubkey_prepare: done
debug3: send packet: type 5
debug3: receive packet: type 7
debug1: SSH2_MSG_EXT_INFO received
debug1: Fssh_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,gssapi-keyex,gssapi-with-mic,password
debug3: start over, passed a different list
publickey,gssapi-keyex,gssapi-with-mic,password
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/myuser/.ssh/id_rsa RSA
SHA256:uJkEs7DCUCz5Rsn8sSrWFEeJo8VSHZRRkDKrER8Obic
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,gssapi-keyex,gssapi-with-mic,password
debug1: Trying private key: /home/myuser/.ssh/id_dsa
debug3: no such identity: /home/myuser/.ssh/id_dsa: No such file or
directory
debug1: Trying private key: /home/myuser/.ssh/id_ecdsa
debug3: no such identity: /home/myuser/.ssh/id_ecdsa: No such file or
directory
debug1: Trying private key: /home/myuser/.ssh/id_ed25519
debug3: no such identity: /home/myuser/.ssh/id_ed25519: No such file or
directory
debug1: Trying private key: /home/myuser/.ssh/id_xmss
debug3: no such identity: /home/myuser/.ssh/id_xmss: No such file or
directory
debug2: we did not send a packet, disable method
debug3: authmethod_lookup password
debug3: remaining preferred: ,password
debug3: authmethod_is_enabled password
debug1: Next authentication method: password
myuser@2607:f130::6287's password:
debug3: send packet: type 50
debug2: we sent a password packet, wait for reply
debug3: receive packet: type 51
debug1: Authentications that can continue:
publickey,gssapi-keyex,gssapi-with-mic,password
Permission denied, please try again.
myuser@2607:f130::6287's password:
debug3: send packet: type 50
debug2: we sent a password packet, wait for reply
debug3: receive packet: type 51
debug1: Authentications that can continue:
publickey,gssapi-keyex,gssapi-with-mic,password
Permission denied, please try again.
myuser@2607:f130::6287's password:

On Wed, Feb 10, 2021 at 1:18 PM Doug McIntyre <merlyn@geeks.org> wrote:

> On Wed, Feb 10, 2021 at 11:47:08AM +0800, PstreeM China wrote:
> > Very thanks, this problem has searched from google, but not find the
> > solution to fix this issue.
> >
> > new install FreeBSD in virtual machine.
> > Freebsd version is 12.2
> > Duel stack support ipv4 and ipv6; enable sshd as default.
> > I can ping the ipv4 and ipv6 address.
> >
> > The problem is:
> > SSH over ipv4 is work well.
> > But ssh over ipv6, Can be connected, but after input the password, it is
> > failed , give the notify : permission denied.
> > can not log into the server.
> > I am sure the password is right.
>
>
> Have you run 'ssh -vvv' to see all the very verbose debug information?
>
> Do you have proper DNS PTRs setup for your IPv6 block? It could be
> blocked by mismatch reverse DNS.
>
> _______________________________________________
> freebsd-questions@freebsd.org mailing list
> https://lists.freebsd.org/mailman/listinfo/freebsd-questions
> To unsubscribe, send any mail to "
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