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Roy Rico
Asked: 2009-05-20 14:36:31 +0800 CST

ssh keys + RHEL5

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I've been able to set up SSH authentication keys on my ubuntu, fedora core and mac systems, however, I'm not able to get SSH keys to work properly with redhat enterprise linux 5 (RHEL5). I've tried created the keys with 2048 bit encryption, but nothing seems to work. Here's the debug output that i get when i try to connect via my mac osx leopard (10.5.7)

I've checked permissions and i'm not able to figure it out... thanks

UPDATE: I've doubled checked my permissions, and they are 0700 for .ssh, and 0600 for .ssh/authorized_keys

royrico@mac ~ $ ssh -vv linuxbox
OpenSSH_5.1p1, OpenSSL 0.9.7l 28 Sep 2006
debug1: Reading configuration data /etc/ssh_config
debug2: ssh_connect: needpriv 0
debug1: Connecting to linuxbox [192.168.2.3] port 22.
debug1: Connection established.
debug1: identity file /Users/royrico/.ssh/identity type -1
debug2: key_type_from_name: unknown key type '-----BEGIN'
debug2: key_type_from_name: unknown key type '-----END'
debug1: identity file /Users/royrico/.ssh/id_rsa type 1
debug1: identity file /Users/royrico/.ssh/id_dsa type -1
debug1: Remote protocol version 2.0, remote software version OpenSSH_4.3
debug1: match: OpenSSH_4.3 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.1
debug2: fd 3 setting O_NONBLOCK
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
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,[email protected],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,[email protected],aes128-ctr,aes192-ctr,aes256-ctr
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,[email protected],hmac-ripemd160,[email protected],hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,[email protected],hmac-ripemd160,[email protected],hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,[email protected],zlib
debug2: kex_parse_kexinit: none,[email protected],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-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,[email protected],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,[email protected],aes128-ctr,aes192-ctr,aes256-ctr
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,hmac-ripemd160,[email protected],hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,hmac-ripemd160,[email protected],hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,[email protected]
debug2: kex_parse_kexinit: none,[email protected]
debug2: kex_parse_kexinit: 
debug2: kex_parse_kexinit: 
debug2: kex_parse_kexinit: first_kex_follows 0 
debug2: kex_parse_kexinit: reserved 0 
debug2: mac_setup: found hmac-md5
debug1: kex: server->client aes128-cbc hmac-md5 none
debug2: mac_setup: 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: 138/256
debug2: bits set: 493/1024
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug1: Host 'linuxbox' is known and matches the RSA host key.
debug1: Found key in /Users/royrico/.ssh/known_hosts:1
debug2: bits set: 504/1024
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: /Users/royrico/.ssh/identity (0x0)
debug2: key: /Users/royrico/.ssh/id_rsa (0x107ea0)
debug2: key: /Users/royrico/.ssh/id_dsa (0x0)
debug1: Authentications that can continue: publickey,gssapi-with-mic,password
debug1: Next authentication method: publickey
debug1: Trying private key: /Users/royrico/.ssh/identity
debug1: Offering public key: /Users/royrico/.ssh/id_rsa
debug2: we sent a publickey packet, wait for reply
debug1: Authentications that can continue: publickey,gssapi-with-mic,password
debug1: Trying private key: /Users/royrico/.ssh/id_dsa
debug2: we did not send a packet, disable method
debug1: Next authentication method: password
royrico@linuxbox's password:
ssh rhel5

5 Answers

  1. Best Answer

    Check the permissions on your ~/.ssh/authorized_keys file. They should be 0600.

    % chmod 0700 .ssh
% chmod 0600 .ssh/authorized_keys

    Is my standard pattern

    Update: Check that your home directory is owned by you alone, ensure that your primary group does not have write access to your home directory. There is an attach vector where someone in your primary group could move your .ssh directory away if they have write permission to the root of your $HOME

    • 3 
  2. debug2: key_type_from_name: unknown key type '-----BEGIN'
debug2: key_type_from_name: unknown key type '-----END'

    These messages look pretty important. It appears you have the wrong type of key in your identity file.

    • 0

  3. When you generate a key pair, you generally have a public key named id_rsa.pub or id_dsa.pub. The contents of this file is what gets pasted into the authorized_keys file on the remote server. Double-check to make sure you added the public half of the key pair to authorized_keys.

    The private key is generally named the same as your public key but without the .pub extension e.g. id_rsa or id_dsa. Perhaps your local system can't find the correct private key to use? Try ssh -i /path/to/private/key linuxbox.

    • 0

  4. It should not require more than (example)

    ssh-keygen -t rsa 
ssh-copy-id -i ~/.ssh/id_rsa.pub [email protected]
ssh-copy-id -i ~/.ssh/id_rsa.pub [email protected]
ssh-copy-id -i ~/.ssh/id_rsa.pub [email protected]
    • 0

  5. hum quick question how is your selinux settings ? what does getenforce says ? if you haven't desactived selinux, maybe you can take a look at the /var/log/audit.log and use audit2why: http://linux.die.net/man/8/audit2why

    or you can as well desactive selinux, editing /etc/sysconfig/selinux

    hope this helps

    • 0