SSH login to same machine with ssh-key keeps prompting for password

xcy7e 웃 asked:

I want user ‘redmine’ to login to the same machine via ssh without a password. However it always asks for a password.
I am on Centos 7, the key has no password.

Content of redmine’s home-dir:

drwx------  redmine redmine   ~/.ssh

-rwx------  redmine redmine   ~/.ssh/id_rsa.pub      
-rwx------  redmine redmine   ~/.ssh/id_rsa         
-rw-------  redmine redmine   ~/.ssh/authorized_keys  (same content as id_rsa.pub)

(I need this to automatically fetch git repositories also stored on the same machine. Suggestions for different approaches are welcome)

Now I type
ssh [email protected] -vvv (when already logged in as user redmine in the shell)

result:

[[email protected]/opt/redmine> ssh [email protected] -vvv
OpenSSH_7.4p1, OpenSSL 1.0.2k-fips  26 Jan 2017
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 58: Applying options for *
debug2: resolving "134.255.217.111" port 22
debug2: ssh_connect_direct: needpriv 0
debug1: Connecting to 134.255.217.111 [134.255.217.111] port 22.
debug1: Connection established.
debug1: identity file /opt/redmine/.ssh/id_rsa type 1
debug1: key_load_public: No such file or directory
debug1: identity file /opt/redmine/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /opt/redmine/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /opt/redmine/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /opt/redmine/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /opt/redmine/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /opt/redmine/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /opt/redmine/.ssh/id_ed25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_7.4
debug1: Remote protocol version 2.0, remote software version OpenSSH_7.4
debug1: match: OpenSSH_7.4 pat OpenSSH* compat 0x04000000
debug2: fd 3 setting O_NONBLOCK
debug1: Authenticating to 134.255.217.111:22 as 'redmine'
debug3: hostkeys_foreach: reading file "/opt/redmine/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /opt/redmine/.ssh/known_hosts:1
debug3: load_hostkeys: loaded 1 keys from 134.255.217.111
debug3: order_hostkeyalgs: prefer hostkeyalgs: [email protected],[email protected],[email protected],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,[email protected],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,ext-info-c
debug2: host key algorithms: [email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,[email protected],[email protected],[email protected],ssh-ed25519,rsa-sha2-512,rsa-sha2-256,ssh-rsa,ssh-dss
debug2: ciphers ctos: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected],aes128-cbc,aes192-cbc,aes256-cbc
debug2: ciphers stoc: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected],aes128-cbc,aes192-cbc,aes256-cbc
debug2: MACs ctos: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,[email protected],zlib
debug2: compression stoc: none,[email protected],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,[email protected],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,ssh-ed25519
debug2: ciphers ctos: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected],aes128-cbc,aes192-cbc,aes256-cbc,blowfish-cbc,cast128-cbc,3des-cbc
debug2: ciphers stoc: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected],aes128-cbc,aes192-cbc,aes256-cbc,blowfish-cbc,cast128-cbc,3des-cbc
debug2: MACs ctos: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,[email protected]
debug2: compression stoc: none,[email protected]
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: [email protected] MAC: <implicit> compression: none
debug1: kex: client->server cipher: [email protected] MAC: <implicit> compression: none
debug1: kex: curve25519-sha256 need=64 dh_need=64
debug1: kex: curve25519-sha256 need=64 dh_need=64
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:RagTUBrGcVX310yTRIfOWqDOhqDi4Un/79pnUOlApIY
debug3: hostkeys_foreach: reading file "/opt/redmine/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /opt/redmine/.ssh/known_hosts:1
debug3: load_hostkeys: loaded 1 keys from 134.255.217.111
debug1: Host '134.255.217.111' is known and matches the ECDSA host key.
debug1: Found key in /opt/redmine/.ssh/known_hosts:1
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
debug2: key: /opt/redmine/.ssh/id_rsa (0x55f227cd00a0)
debug2: key: /opt/redmine/.ssh/id_dsa ((nil))
debug2: key: /opt/redmine/.ssh/id_ecdsa ((nil))
debug2: key: /opt/redmine/.ssh/id_ed25519 ((nil))
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,gssapi-keyex,gssapi-with-mic,password
debug3: start over, passed a different list publickey,gssapi-keyex,gssapi-with-mic,password
debug3: preferred gssapi-keyex,gssapi-with-mic,publickey,keyboard-interactive,password
debug3: authmethod_lookup gssapi-keyex
debug3: remaining preferred: gssapi-with-mic,publickey,keyboard-interactive,password
debug3: authmethod_is_enabled gssapi-keyex
debug1: Next authentication method: gssapi-keyex
debug1: No valid Key exchange context
debug2: we did not send a packet, disable method
debug3: authmethod_lookup gssapi-with-mic
debug3: remaining preferred: publickey,keyboard-interactive,password
debug3: authmethod_is_enabled gssapi-with-mic
debug1: Next authentication method: gssapi-with-mic
debug1: Unspecified GSS failure.  Minor code may provide more information
No Kerberos credentials available (default cache: KEYRING:persistent:1001)

debug1: Unspecified GSS failure.  Minor code may provide more information
No Kerberos credentials available (default cache: KEYRING:persistent:1001)

debug2: we did not send a packet, disable method
debug3: authmethod_lookup publickey
debug3: remaining preferred: keyboard-interactive,password
debug3: authmethod_is_enabled publickey
debug1: Next authentication method: publickey
debug1: Offering RSA public key: /opt/redmine/.ssh/id_rsa
debug3: send_pubkey_test
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: /opt/redmine/.ssh/id_dsa
debug3: no such identity: /opt/redmine/.ssh/id_dsa: No such file or directory
debug1: Trying private key: /opt/redmine/.ssh/id_ecdsa
debug3: no such identity: /opt/redmine/.ssh/id_ecdsa: No such file or directory
debug1: Trying private key: /opt/redmine/.ssh/id_ed25519
debug3: no such identity: /opt/redmine/.ssh/id_ed25519: 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
[email protected]'s password:

Content of /var/log/secure

Feb  4 00:22:14 vps-ts su: pam_unix(su:session): session opened for user redmine by john(uid=0)
Feb  4 00:22:22 vps-ts sshd[20705]: Authentication refused: bad ownership or modes for directory /opt/redmine

Unrecommended workaround:
sshd_config:

StrictMode no

My answer:


The ssh log tells you what the problem is:

Authentication refused: bad ownership or modes for directory /opt/redmine

Notice that it tells you exactly which directory it is concerned with: In this case, it’s the home directory itself.

The user’s home directory cannot be group or world writable, and must be owned by the same user.


View the full question and any other answers on Server Fault.

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