A autenticação de chave pública SSH funciona na LAN e não na WAN

Question

Eu configurei meu servidor SSH para usar a autenticação de chave pública. Quando me conecto ao meu servidor na rede local, ele é autenticado. Mas isso não acontece quando me conecto pela internet.

Eu não acho que o problema seja o encaminhamento de porta. Ele costumava funcionar antes de desabilitar o login de senha no servidor.

Aqui está a saída de ssh -vvv [email protected]

OpenSSH_6.2p2, OSSLShim 0.9.8r 8 Dec 2011
debug1: Reading configuration data /etc/ssh_config
debug1: /etc/ssh_config line 20: Applying options for *
debug1: /etc/ssh_config line 53: Applying options for *
debug2: ssh_connect: needpriv 0
debug1: Connecting to example.com [1.2.3.4] port 22.
debug1: Connection established.
debug3: Incorrect RSA1 identifier
debug3: Could not load "/Users/myuser/.ssh/id_rsa" as a RSA1 public key
debug1: identity file /Users/myuser/.ssh/id_rsa type 1
debug1: identity file /Users/myuser/.ssh/id_rsa-cert type -1
debug1: identity file /Users/myuser/.ssh/id_dsa type -1
debug1: identity file /Users/myuser/.ssh/id_dsa-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.2
debug1: Remote protocol version 2.0, remote software version dropbear_0.52
debug1: no match: dropbear_0.52
debug2: fd 3 setting O_NONBLOCK
debug3: put_host_port: [example.com]:22
debug3: load_hostkeys: loading entries for host "[example.com]:22" from file "/Users/myuser/.ssh/known_hosts"
debug3: load_hostkeys: found key type RSA in file /Users/myuser/.ssh/known_hosts:2
debug3: load_hostkeys: loaded 1 keys
debug3: order_hostkeyalgs: prefer hostkeyalgs: [email protected],[email protected],ssh-rsa
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: [email protected],[email protected],ssh-rsa,[email protected],[email protected],ssh-dss
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,[email protected],[email protected],aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,[email protected]
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,[email protected],[email protected],aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,[email protected]
debug2: kex_parse_kexinit: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-md5,hmac-sha1,[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,[email protected],hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-md5,hmac-sha1,[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,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-group1-sha1
debug2: kex_parse_kexinit: ssh-rsa,ssh-dss
debug2: kex_parse_kexinit: aes128-ctr,3des-ctr,aes256-ctr,aes128-cbc,3des-cbc,aes256-cbc,twofish256-cbc,twofish-cbc,twofish128-cbc,blowfish-cbc
debug2: kex_parse_kexinit: aes128-ctr,3des-ctr,aes256-ctr,aes128-cbc,3des-cbc,aes256-cbc,twofish256-cbc,twofish-cbc,twofish128-cbc,blowfish-cbc
debug2: kex_parse_kexinit: hmac-sha1-96,hmac-sha1,hmac-md5
debug2: kex_parse_kexinit: hmac-sha1-96,hmac-sha1,hmac-md5
debug2: kex_parse_kexinit: none
debug2: kex_parse_kexinit: none
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-ctr hmac-md5 none
debug2: mac_setup: found hmac-md5
debug1: kex: client->server aes128-ctr hmac-md5 none
debug2: dh_gen_key: priv key bits set: 132/256
debug2: bits set: 501/1024
debug1: sending SSH2_MSG_KEXDH_INIT
debug1: expecting SSH2_MSG_KEXDH_REPLY
debug1: Server host key: RSA 10:21:9f:80:7b:a3:94:0d:ca:3b:15:fd:e1:37:20:ee
debug3: put_host_port: [1.2.3.4]:22
debug3: put_host_port: [example.com]:22
debug3: load_hostkeys: loading entries for host "[example.com]:22" from file "/Users/myuser/.ssh/known_hosts"
debug3: load_hostkeys: found key type RSA in file /Users/myuser/.ssh/known_hosts:2
debug3: load_hostkeys: loaded 1 keys
debug3: load_hostkeys: loading entries for host "[1.2.3.4]:22" from file "/Users/myuser/.ssh/known_hosts"
debug3: load_hostkeys: found key type RSA in file /Users/myuser/.ssh/known_hosts:2
debug3: load_hostkeys: loaded 1 keys
debug1: Host '[example.com]:22' is known and matches the RSA host key.
debug1: Found key in /Users/myuser/.ssh/known_hosts:2
debug2: bits set: 534/1024
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: Roaming not allowed by server
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug2: key: /Users/myuser/.ssh/id_rsa (0x7fc0336004b0),
debug2: key: /Users/myuser/.ssh/id_dsa (0x0),
debug1: Authentications that can continue: publickey,password
debug3: start over, passed a different list publickey,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 RSA public key: /Users/myuser/.ssh/id_rsa
debug3: send_pubkey_test
debug2: we sent a publickey packet, wait for reply
debug1: Authentications that can continue: publickey,password
debug1: Trying private key: /Users/myuser/.ssh/id_dsa
debug3: no such identity: /Users/myuser/.ssh/id_dsa: 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:

e aqui o sshd_config do meu servidor:

# Package generated configuration file# See the sshd_config(5) manpage for details

# What ports, IPs and protocols we listen for
Port 22
# Use these options to restrict which interfaces/protocols sshd will bind to
#ListenAddress ::
#ListenAddress 0.0.0.0
Protocol 2
# HostKeys for protocol version 2
HostKey /etc/ssh/ssh_host_rsa_key
HostKey /etc/ssh/ssh_host_dsa_key
HostKey /etc/ssh/ssh_host_ecdsa_key
#Privilege Separation is turned on for security
UsePrivilegeSeparation yes

# Lifetime and size of ephemeral version 1 server key
KeyRegenerationInterval 3600
ServerKeyBits 768

# Logging
SyslogFacility AUTH
LogLevel INFO

# Authentication:
LoginGraceTime 120
PermitRootLogin no
StrictModes yes

RSAAuthentication yes
PubkeyAuthentication yes
AuthorizedKeysFile  %h/.ssh/authorized_keys

# Don't read the user's ~/.rhosts and ~/.shosts files
IgnoreRhosts yes
# For this to work you will also need host keys in /etc/ssh_known_hosts
RhostsRSAAuthentication no
# similar for protocol version 2
HostbasedAuthentication no
# Uncomment if you don't trust ~/.ssh/known_hosts for RhostsRSAAuthentication
#IgnoreUserKnownHosts yes

# To enable empty passwords, change to yes (NOT RECOMMENDED)
PermitEmptyPasswords no

# Change to yes to enable challenge-response passwords (beware issues with
# some PAM modules and threads)
ChallengeResponseAuthentication no

# Change to no to disable tunnelled clear text passwords
PasswordAuthentication no

# Kerberos options
#KerberosAuthentication no
#KerberosGetAFSToken no
#KerberosOrLocalPasswd yes
#KerberosTicketCleanup yes

# GSSAPI options
#GSSAPIAuthentication no
#GSSAPICleanupCredentials yes

X11Forwarding yes
X11DisplayOffset 10
PrintMotd no
PrintLastLog yes
TCPKeepAlive yes
#UseLogin no

#MaxStartups 10:30:60
#Banner /etc/issue.net

# Allow client to pass locale environment variables
AcceptEnv LANG LC_*

Subsystem sftp /usr/lib/openssh/sftp-server

# Set this to 'yes' to enable PAM authentication, account processing,
# and session processing. If this is enabled, PAM authentication will
# be allowed through the ChallengeResponseAuthentication and
# PasswordAuthentication.  Depending on your PAM configuration,
# PAM authentication via ChallengeResponseAuthentication may bypass
# the setting of "PermitRootLogin without-password".
# If you just want the PAM account and session checks to run without
# PAM authentication, then enable this but set PasswordAuthentication
# and ChallengeResponseAuthentication to 'no'.
UsePAM yes

Se for útil, meu servidor é Raspbian e meu cliente é o OS X Mavericks

EDIT: a permissão do diretório ~ / .ssh no servidor está configurada para 700. O arquivo authorized_keys está configurado para 600.

EDIT: Log da conexão interna:

$ ssh 192.168.2.145 -l user -vvv                                                                                                          [14:48:01]
OpenSSH_6.2p2, OSSLShim 0.9.8r 8 Dec 2011
debug1: Reading configuration data /etc/ssh_config
debug1: /etc/ssh_config line 20: Applying options for *
debug1: /etc/ssh_config line 53: Applying options for *
debug2: ssh_connect: needpriv 0
debug1: Connecting to 192.168.2.145 [192.168.2.145] port 22.
debug1: Connection established.
debug3: Incorrect RSA1 identifier
debug3: Could not load "/Users/myuser/.ssh/id_rsa" as a RSA1 public key
debug1: identity file /Users/myuser/.ssh/id_rsa type 1
debug1: identity file /Users/myuser/.ssh/id_rsa-cert type -1
debug1: identity file /Users/myuser/.ssh/id_dsa type -1
debug1: identity file /Users/myuser/.ssh/id_dsa-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.2
debug1: Remote protocol version 2.0, remote software version OpenSSH_6.0p1 Debian-4
debug1: match: OpenSSH_6.0p1 Debian-4 pat OpenSSH*
debug2: fd 3 setting O_NONBLOCK
debug3: put_host_port: [192.168.2.145]:22
debug3: load_hostkeys: loading entries for host "[192.168.2.145]:22" from file "/Users/myuser/.ssh/known_hosts"
debug3: load_hostkeys: found key type RSA in file /Users/myuser/.ssh/known_hosts:1
debug3: load_hostkeys: loaded 1 keys
debug3: order_hostkeyalgs: prefer hostkeyalgs: [email protected],[email protected],ssh-rsa
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: [email protected],[email protected],ssh-rsa,[email protected],[email protected],ssh-dss
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,[email protected],[email protected],aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,[email protected]
debug2: kex_parse_kexinit: aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,[email protected],[email protected],aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc,aes256-cbc,arcfour,[email protected]
debug2: kex_parse_kexinit: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-md5,hmac-sha1,[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-ripemd160,[email protected],hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-md5,hmac-sha1,[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,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: ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,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,ecdsa-sha2-nistp256
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,[email protected]
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,[email protected]
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,[email protected],hmac-sha2-256,hmac-sha2-256-96,hmac-sha2-512,hmac-sha2-512-96,hmac-ripemd160,[email protected],hmac-sha1-96,hmac-md5-96
debug2: kex_parse_kexinit: hmac-md5,hmac-sha1,[email protected],hmac-sha2-256,hmac-sha2-256-96,hmac-sha2-512,hmac-sha2-512-96,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-ctr hmac-md5 none
debug2: mac_setup: found hmac-md5
debug1: kex: client->server aes128-ctr 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: 128/256
debug2: bits set: 514/1024
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug1: Server host key: RSA 12:1b:b5:5b:ab:f9:55:ed:e9:e9:56:cf:8c:a1:4c:4e
debug3: put_host_port: [192.168.2.145]:22
debug3: put_host_port: [192.168.2.145]:22
debug3: load_hostkeys: loading entries for host "[192.168.2.145]:22" from file "/Users/myuser/.ssh/known_hosts"
debug3: load_hostkeys: found key type RSA in file /Users/myuser/.ssh/known_hosts:1
debug3: load_hostkeys: loaded 1 keys
debug3: load_hostkeys: loading entries for host "[192.168.2.145]:22" from file "/Users/myuser/.ssh/known_hosts"
debug3: load_hostkeys: found key type RSA in file /Users/myuser/.ssh/known_hosts:1
debug3: load_hostkeys: loaded 1 keys
debug1: Host '[192.168.2.145]:22' is known and matches the RSA host key.
debug1: Found key in /Users/myuser/.ssh/known_hosts:1
debug2: bits set: 534/1024
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: Roaming not allowed by server
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug2: key: /Users/myuser/.ssh/id_rsa (0x7ffeda40b940),
debug2: key: /Users/myuser/.ssh/id_dsa (0x0),
debug1: Authentications that can continue: publickey
debug3: start over, passed a different list publickey
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 RSA public key: /Users/myuser/.ssh/id_rsa
debug3: send_pubkey_test
debug2: we sent a publickey packet, wait for reply
debug1: Server accepts key: pkalg ssh-rsa blen 279
debug2: input_userauth_pk_ok: fp 8e:81:e9:af:21:99:69:37:61:69:3a:76:b9:42:00:00
debug3: sign_and_send_pubkey: RSA 8e:81:e9:af:21:99:69:37:61:69:3a:76:b9:42:00:00
debug1: read PEM private key done: type RSA
debug1: Authentication succeeded (publickey).
Authenticated to 192.168.2.145 ([192.168.2.145]:22).
debug1: channel 0: new [client-session]
debug3: ssh_session2_open: channel_new: 0
debug2: channel 0: send open
debug1: Requesting [email protected]
debug1: Entering interactive session.
debug2: callback start
debug2: fd 3 setting TCP_NODELAY
debug3: packet_set_tos: set IP_TOS 0x10
debug2: client_session2_setup: id 0
debug2: channel 0: request pty-req confirm 1
debug1: Sending environment.
debug3: Ignored env PATH
debug3: Ignored env TMPDIR
debug3: Ignored env SHELL
debug3: Ignored env HOME
debug3: Ignored env USER
debug3: Ignored env LOGNAME
debug3: Ignored env SSH_AUTH_SOCK
debug3: Ignored env Apple_PubSub_Socket_Render
debug3: Ignored env DISPLAY
debug3: Ignored env __CHECKFIX1436934
debug3: Ignored env __CF_USER_TEXT_ENCODING
debug3: Ignored env SECURITYSESSIONID
debug3: Ignored env TERM_PROGRAM
debug3: Ignored env PWD
debug1: Sending env LC_CTYPE = 
debug2: channel 0: request env confirm 0
debug3: Ignored env TERM
debug3: Ignored env ITERM_SESSION_ID
debug3: Ignored env ITERM_PROFILE
debug3: Ignored env SHLVL
debug3: Ignored env OLDPWD
debug3: Ignored env GREP_OPTIONS
debug3: Ignored env GREP_COLOR
debug3: Ignored env PAGER
debug3: Ignored env LESS
debug3: Ignored env LSCOLORS
debug3: Ignored env LS_COLORS
debug1: Sending env LC_ALL = en_US.UTF-8
debug2: channel 0: request env confirm 0
debug1: Sending env LANG = en_US.UTF-8
debug2: channel 0: request env confirm 0
debug3: Ignored env _
debug2: channel 0: request shell confirm 1
debug2: callback done
debug2: channel 0: open confirm rwindow 0 rmax 32768
debug2: channel_input_status_confirm: type 99 id 0
debug2: PTY allocation request accepted on channel 0
debug2: channel 0: rcvd adjust 2097152
debug2: channel_input_status_confirm: type 99 id 0
debug2: shell request accepted on channel 0

    

Answer 1

Acontece que eu tinha habilitado o SSH no meu roteador Tomato na mesma porta. Minha tentativa de conexão foi ao roteador, não ao meu host. Eu mudei as portas e tudo está bem.

    

Answer 2

Editar 2 :
Você deve considerar t usar o IP correto Não sei o que você está tentando, mas é estranho: Trabalhando : debug1: Connecting to 192.168.2.145 [192.168.2.145] port 22.
[...]
debug1: Remote protocol version 2.0, remote software version OpenSSH_6.0p1 Debian-4

Não funciona : debug1: Connecting to example.com [1.2.3.4] port 22.
[...]
Remote protocol version 2.0, remote software version dropbear_0.52

Aposto que você está se conectando ao ip errado e outro deamon está respondendo a você provavelmente o da sua caixa de provedor de internet e você deve pensar em mudar o ISP, já que habilitar sshd no IP externo para uma caixa de provedor não é realmente seguro.

Extrair da página inicial do deamon dropbear

Dropbear is a relatively small SSH server and client. It runs on a variety of POSIX-based platforms. Dropbear is open source software, distributed under a MIT-style license. Dropbear is particularly useful for "embedded"-type Linux (or other Unix) systems, such as wireless routers.

Fonte

Editar 1 :
OpenSSH_6.2p2, OSSLShim 0.9.8r 8 Dec 2011
seu deamon ssh foi compilado em 2011?
Não parece realista você afirmou que você está usando wheezy e OS X dissidente. Você tem certeza de autenticar contra o mesmo deamon em sua LAN e na WAN?

Resposta original
Seu servidor usa autenticação de certificado e senha:

debug1: Authentications that can continue: publickey,password
debug1: Trying private key: /Users/myuser/.ssh/id_dsa
debug3: no such identity: /Users/myuser/.ssh/id_dsa: No such file or directory
debug2: we did not send a packet, disable method

Mas o computador que você usa fora não fornece um certificado et:
no such identity:/Users/myuser/.ssh/id_dsa

Sua identidade não é conhecida pelo servidor e o certificado não existe em seu cliente, então você volta para a autenticação de senha do usuário.

Você tentou com o mesmo computador de fora da sua rede?

    

Answer 3

Do log, parece que seu id_rsa (você não parece ter id_dsa) não está correspondendo ao servidor.

Eu recomendo que você altere o servidor de volta para aceitar senhas e, em seguida, use ssh-copy-id para copiar seu ID para o servidor e, em seguida, desative as senhas.