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  • Passwordless SSH with public key between 2 servers – troubleshooting /home permission issue

    Posted on May 15th, 2012 by fath

    Hi All,

    Whenever we faced issue during SSH between 2 servers with public key, remember always to run with verbose option (-vvv) to troubleshoot the issue. Below is what I saw in the terminal with -vvv option:

    [XXX@XXXXX .ssh]$ ssh -vvv XXXX@XX.XX.XX.XX
    OpenSSH_3.9p1, OpenSSL 0.9.7a Feb 19 2003
    debug1: Reading configuration data /etc/ssh/ssh_config
    debug1: Applying options for *
    debug2: ssh_connect: needpriv 0
    debug1: Connecting to XX.XX.XX.XX [XX.XX.XX.XX] port 22.
    debug1: Connection established.
    debug1: identity file /home/aia/.ssh/identity type 0
    debug3: Not a RSA1 key file /home/aia/.ssh/id_rsa.
    debug2: key_type_from_name: unknown key type ‘—–BEGIN’
    debug3: key_read: missing keytype
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug2: key_type_from_name: unknown key type ‘—–END’
    debug3: key_read: missing keytype
    debug1: identity file /home/aia/.ssh/id_rsa type 1
    debug3: Not a RSA1 key file /home/aia/.ssh/id_dsa.
    debug2: key_type_from_name: unknown key type ‘—–BEGIN’
    debug3: key_read: missing keytype
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug3: key_read: missing whitespace
    debug2: key_type_from_name: unknown key type ‘—–END’
    debug3: key_read: missing keytype
    debug1: identity file /home/aia/.ssh/id_dsa type 2
    debug1: Remote protocol version 2.0, remote software version OpenSSH_4.5p1+sftpfilecontrol-v1.1-hpn12v14
    debug1: match: OpenSSH_4.5p1+sftpfilecontrol-v1.1-hpn12v14 pat OpenSSH*
    debug1: Enabling compatibility mode for protocol 2.0
    debug1: Local version string SSH-2.0-OpenSSH_3.9p1
    debug2: fd 3 setting O_NONBLOCK
    debug1: SSH2_MSG_KEXINIT sent
    debug1: SSH2_MSG_KEXINIT received
    debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman group1-sha1
    debug2: kex_parse_kexinit: ssh-rsa,ssh-dss
    debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,aes192-cbc,aes256 cbc,rijndael-cbc@lysator.liu.se,aes128-ctr,aes192-ctr,aes256-ctr
    debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se,aes128-ctr,aes192-ctr,aes256-ctr
    debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
    debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
    debug2: kex_parse_kexinit: none,zlib
    debug2: kex_parse_kexinit: none,zlib
    debug2: kex_parse_kexinit:
    debug2: kex_parse_kexinit:
    debug2: kex_parse_kexinit: first_kex_follows 0
    debug2: kex_parse_kexinit: reserved 0
    debug2: kex_parse_kexinit: diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
    debug2: kex_parse_kexinit: ssh-rsa,ssh-dss
    debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour128,arcfour256,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se,aes128-ctr,aes192-ctr,aes256-ctr
    debug2: kex_parse_kexinit: aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour128,arcfour256,arcfour,aes192-cbc,aes256-cbc,rijndael-cbc@lysator.liu.se,aes128-ctr,aes192-ctr,aes256-ctr
    debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
    debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
    debug2: kex_parse_kexinit: none,zlib@openssh.com
    debug2: kex_parse_kexinit: none,zlib@openssh.com
    debug2: kex_parse_kexinit:
    debug2: kex_parse_kexinit:
    debug2: kex_parse_kexinit: first_kex_follows 0
    debug2: kex_parse_kexinit: reserved 0
    debug2: mac_init: found hmac-md5
    debug1: kex: server->client aes128-cbc hmac-md5 none
    debug2: mac_init: found hmac-md5
    debug1: kex: client->server aes128-cbc hmac-md5 none
    debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent
    debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
    debug2: dh_gen_key: priv key bits set: 137/256
    debug2: bits set: 536/1024
    debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
    debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
    debug3: check_host_in_hostfile: filename /home/aia/.ssh/known_hosts
    debug3: check_host_in_hostfile: match line 2
    debug1: Host ‘10.14.24.114’ is known and matches the RSA host key.
    debug1: Found key in /home/aia/.ssh/known_hosts:2
    debug2: bits set: 489/1024
    debug1: ssh_rsa_verify: signature correct
    debug2: kex_derive_keys
    debug2: set_newkeys: mode 1
    debug1: SSH2_MSG_NEWKEYS sent
    debug1: expecting SSH2_MSG_NEWKEYS
    debug2: set_newkeys: mode 0
    debug1: SSH2_MSG_NEWKEYS received
    debug1: SSH2_MSG_SERVICE_REQUEST sent
    debug2: service_accept: ssh-userauth
    debug1: SSH2_MSG_SERVICE_ACCEPT received
    debug2: key: /home/aia/.ssh/id_rsa (0x552ac03c40)
    debug2: key: /home/aia/.ssh/id_dsa (0x552ac04190)
    debug1: Authentications that can continue: publickey,password,keyboard-interactive
    debug3: start over, passed a different list publickey,password,keyboard-interactive
    debug3: preferred gssapi-with-mic,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/aia/.ssh/id_rsa
    debug3: send_pubkey_test
    debug2: we sent a publickey packet, wait for reply
    debug1: Authentications that can continue: publickey,password,keyboard-interactive
    debug1: Offering public key: /home/aia/.ssh/id_dsa
    debug3: send_pubkey_test
    debug2: we sent a publickey packet, wait for reply
    debug1: Authentications that can continue: publickey,password,keyboard-interactive
    debug2: we did not send a packet, disable method
    debug3: authmethod_lookup keyboard-interactive
    debug3: remaining preferred: password
    debug3: authmethod_is_enabled keyboard-interactive
    debug1: Next authentication method: keyboard-interactive
    debug2: userauth_kbdint
    debug2: we sent a keyboard-interactive packet, wait for reply
    debug2: input_userauth_info_req
    debug2: input_userauth_info_req: num_prompts 1
    Password:

     

    Looks like we’re asked about the password although we’ve concatenate the source public key into target authorized_keys. Hmm.. So, what’s the issue? Permission! From what I saw in the server, authorized_keys, .ssh directory, were set with correct permission. Hm.. what else? Let’s see the server syslog.

    May 15 14:50:43 XXXXXX sshd[12193]: Authentication refused: bad ownership or modes for directory /home/staging

     

    Yeah, now we got a clue.. There’s issue with our home directory permission. Below is the permission set:

    drwxrwxr-x   3 staging    staging       8192 May 15 08:55 staging

    Probably 775 is too much for this directory. Let’s make it 755.
    Now we can SSH successfully without password. 🙂

     

    Rights for non-DOD U.S. Government Departments and Agencies are as set
    forth in FAR 52.227-19(c)(1,2).
    You have mail.
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