User-id with chroot prompt for password!

[Ahmed_58]

Dears,
I setup a sftp/scp user using chroot script to limite access and use only for file transfer...with below steps. everything works perfect, only one problem, it is prompting for password! although I use the key-gen.

1. SSH version must be 5.10.x and above
2. use chroot to create the sftp/scp user
3. change /etc/passwd to include /./
4. after using chroot,,, remeber to restart ssh

Regards,
Ahmed

[Ivan Krastev]

Enable more detailed logging in ssh daemon to see what is error denying direct access without password. In most cases this is file/directory permissions.

regards,
ivan

[Ahmed_58]

Ivan,
I still can't figure out where is the problem....

$ sftp -vvv machnet@bat-bc2
Connecting to bat-bc2...
OpenSSH_5.1p1+sftpfilecontrol-v1.2-hpn13v5, OpenSSL 0.9.7m 23 Feb 2007
HP-UX Secure Shell-A.05.10.006, HP-UX Secure Shell version
debug1: Reading configuration data /opt/ssh/etc/ssh_config
debug3: Seeding PRNG from /opt/ssh/libexec/ssh-rand-helper
debug2: ssh_connect: needpriv 0
debug1: Connecting to bat-bc2 [10.3.4.17] port 22.
debug1: Connection established.
debug3: Not a RSA1 key file /home/machnet/.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
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/machnet/.ssh/id_rsa type 1
debug1: identity file /home/machnet/.ssh/id_dsa type -1
debug1: Remote protocol version 1.99, remote software version OpenSSH_5.2p1+sftpfilecontrol-v1.3
debug1: match: OpenSSH_5.2p1+sftpfilecontrol-v1.3 pat OpenSSH*
debug1: Remote is NON-HPN aware
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.1p1+sftpfilecontrol-v1.2-hpn13v5
debug2: fd 4 setting O_NONBLOCK
debug3: RNG is ready, skipping seeding
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: AUTH STATE IS 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,umac-64@openssh.com,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,umac-64@openssh.com,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: none,zlib@openssh.com,zlib
debug2: kex_parse_kexinit: none,zlib@openssh.com,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-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,rijndael-cbc@lysator.liu.se
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,umac-64@openssh.com,hmac-ripemd160,hmac-ripemd160@openssh.com,hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,umac-64@openssh.com,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_setup: found hmac-md5
debug1: REQUESTED ENC.NAME is 'aes128-cbc'
debug1: kex: server->client aes128-cbc hmac-md5 none
debug2: mac_setup: found hmac-md5
debug1: REQUESTED ENC.NAME is 'aes128-cbc'
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: 521/1024
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug3: check_host_in_hostfile: filename /home/machnet/.ssh/known_hosts
debug3: check_host_in_hostfile: match line 1
debug3: check_host_in_hostfile: filename /home/machnet/.ssh/known_hosts
debug3: check_host_in_hostfile: match line 2
debug1: Host 'bat-bc2' is known and matches the RSA host key.
debug1: Found key in /home/machnet/.ssh/known_hosts:1
debug2: bits set: 490/1024
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/machnet/.ssh/id_rsa (40031c98)
debug2: key: /home/machnet/.ssh/id_dsa (0)
debug1: Authentications that can continue: publickey,password,keyboard-interactive
debug3: start over, passed a different list publickey,password,keyboard-interactive
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/machnet/.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: Trying private key: /home/machnet/.ssh/id_dsa
debug3: no such identity: /home/machnet/.ssh/id_dsa
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:

[Aneesh Mohan]

Hi Ahmed,

Please re-generate the ssh key in the client server and copy id_rsa.pub on the destination server $HOME/.ssh/authorized_keys.

/opt/ssh/bin/ssh-keygen -t rsa


Regards,
Aneesh

[Ahmed_58]

Hi Aneesh,

still the same,.... asking for password.

Ahmed

[Aneesh Mohan]

Hi Ahmed,

Could you please post

a)
#sftp -v machnet@bat-bc2

b)on client machine
$ cat id_rsa.pub

c)on bat-bc2
$cat authorized_keys


Regards,
Aneesh

[Ahmed_58]

HI Aneesh,..

$ sftp -v machnet@bat-bc2
Connecting to bat-bc2...
OpenSSH_5.1p1+sftpfilecontrol-v1.2-hpn13v5, OpenSSL 0.9.7m 23 Feb 2007
HP-UX Secure Shell-A.05.10.006, HP-UX Secure Shell version
debug1: Reading configuration data /opt/ssh/etc/ssh_config
debug1: Connecting to bat-bc2 [10.3.4.17] port 22.
debug1: Connection established.
debug1: identity file /home/machnet/.ssh/id_rsa type 1
debug1: identity file /home/machnet/.ssh/id_dsa type -1
debug1: Remote protocol version 1.99, remote software version OpenSSH_5.2p1+sftpfilecontrol-v1.3
debug1: match: OpenSSH_5.2p1+sftpfilecontrol-v1.3 pat OpenSSH*
debug1: Remote is NON-HPN aware
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.1p1+sftpfilecontrol-v1.2-hpn13v5
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: AUTH STATE IS 0
debug1: REQUESTED ENC.NAME is 'aes128-cbc'
debug1: kex: server->client aes128-cbc hmac-md5 none
debug1: REQUESTED ENC.NAME is 'aes128-cbc'
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
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug1: Host 'bat-bc2' is known and matches the RSA host key.
debug1: Found key in /home/machnet/.ssh/known_hosts:1
debug1: ssh_rsa_verify: signature correct
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey,password,keyboard-interactive
debug1: Next authentication method: publickey
debug1: Offering public key: /home/machnet/.ssh/id_rsa
debug1: Authentications that can continue: publickey,password,keyboard-interactive
debug1: Trying private key: /home/machnet/.ssh/id_dsa
debug1: Next authentication method: keyboard-interactive
Password:
$ cat id_rsa.pub
ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEA4fqnijOjAg9IX4FOrBJ7mi1nLVSEV96vNthjHbprm+NiQHP1LEsaUMA5VRlEFE5QpYvYIM02s1MiuScRDfeuQtP0PwVdBNhZzfUw6rVh1V6FCr1PV7a/ZjcpqbyLZRdXMrWMyjdMd1v1Sp+gnsJ8afUg4K5SjRgmvWAN3nQHmhc1N7YGk6/tRQpg4J0CcjIGg2sAApwhcpzhPrdikDk7ItMItpTIOJLW8B4JWoP3B/jJv3XQgt9Nj9ALx5jWOOl6BQA2s35AL6a+KLeByvyV28QzUFhUiJ2srJi8iY9gc/qhzDq9C3Yquob2Y+JF+tLpAXUL8zW//0sXmC24ksXElQ== machnet@bat-fms1
------------------------------------

# cat authorized_keys
ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEA4fqnijOjAg9IX4FOrBJ7mi1nLVSEV96vNthjHbprm+NiQHP1LEsaUMA5VRlEFE5QpYvYIM02s1MiuScRDfeuQtP0PwVdBNhZzfUw6rVh1V6FCr1PV7a/ZjcpqbyLZRdXMrWMyjdMd1v1Sp+gnsJ8afUg4K5SjRgmvWAN3nQHmhc1N7YGk6/tRQpg4J0CcjIGg2sAApwhcpzhPrdikDk7ItMItpTIOJLW8B4JWoP3B/jJv3XQgt9Nj9ALx5jWOOl6BQA2s35AL6a+KLeByvyV28QzUFhUiJ2srJi8iY9gc/qhzDq9C3Yquob2Y+JF+tLpAXUL8zW//0sXmC24ksXElQ== machnet@bat-fms1

Regards,
Ahmed

[Ganesan R]

Hi Ahmed,

Most of the time it would be the permission issue. Make sure the following permission for password less login should work.

Users home directory should have 755 permission
$HOME/.ssh directory should have 700 permission
$HOME/.ssh/authorized_keys file should have 600 permission

[Aneesh Mohan]

Hi Ahmed,

I feel the problem is just because of the version mismatch.

I can see on client you have version
OpenSSH_5.1p1+sftpfilecontrol-v1.2-hpn13v5 on client.

I suggest you can upgrade to the latest version 5.2 on client and re-generate the keys should work.

You can download the 5.2 version from the below link.

http://h20392.www2.hp.com/portal/swdepot/displayProductInfo.do?productNumber=T1471AA


Regards,
Aneesh

[Ahmed_58]

Hi,
Permissions checked all OK. but still getting prompt for password.

Regards,
Ahmed