Atualmente, acessamos o servidor axway sftp de terceiros manualmente por meio de uma interface do usuário da web e gostaríamos de configurar um login sem senha para permitir downloads automáticos.
Verifiquei se o arquivo allowed_keys está localizado no caminho correto, se possui as permissões corretas e no formato correto. Agora há três chaves no arquivo; um para rsa, dsa e ecdsa. Nenhum parece funcionar.
Temos apenas acesso sftp; não ssh.
Como o terceiro é uma empresa multinacional de bluechip com tempo de resposta lento para consultas técnicas, eu gostaria de poder fazer uma solicitação precisa em primeira instância.
Aqui está a saída de -vvv:
kevin@ubuntu:~/.ssh$ sftp -vvv <SERVER NAME CHANGED TO PROTECT THE INNOCENT>
OpenSSH_5.9p1 Debian-5ubuntu1.1, OpenSSL 1.0.1 14 Mar 2012
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug1: /etc/ssh/ssh_config line 55: Applying options for <SERVER NAME CHANGED TO PROTECT THE INNOCENT>
debug2: ssh_connect: needpriv 0
debug1: Connecting to <SERVER NAME CHANGED TO PROTECT THE INNOCENT> [nnn.nnn.nnn.nnn] port 2222.
debug1: Connection established.
debug3: Incorrect RSA1 identifier
debug3: Could not load "/home/kevin/.ssh/id_rsa" as a RSA1 public key
debug1: identity file /home/kevin/.ssh/id_rsa type 1
debug1: Checking blacklist file /usr/share/ssh/blacklist.RSA-2048
debug1: Checking blacklist file /etc/ssh/blacklist.RSA-2048
debug1: identity file /home/kevin/.ssh/id_rsa-cert type -1
debug3: Incorrect RSA1 identifier
debug3: Could not load "/home/kevin/.ssh/id_dsa" as a RSA1 public key
debug1: identity file /home/kevin/.ssh/id_dsa type 2
debug1: Checking blacklist file /usr/share/ssh/blacklist.DSA-1024
debug1: Checking blacklist file /etc/ssh/blacklist.DSA-1024
debug1: identity file /home/kevin/.ssh/id_dsa-cert type -1
debug3: Incorrect RSA1 identifier
debug3: Could not load "/home/kevin/.ssh/id_ecdsa" as a RSA1 public key
debug1: identity file /home/kevin/.ssh/id_ecdsa type 3
debug1: Checking blacklist file /usr/share/ssh/blacklist.ECDSA-256
debug1: Checking blacklist file /etc/ssh/blacklist.ECDSA-256
debug1: identity file /home/kevin/.ssh/id_ecdsa-cert type -1
debug1: Remote protocol version 2.0, remote software version SSHD
debug1: no match: SSHD
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.9p1 Debian-5ubuntu1.1
debug2: fd 3 setting O_NONBLOCK
debug3: put_host_port: [<SERVER NAME CHANGED TO PROTECT THE INNOCENT>]:2222
debug3: load_hostkeys: loading entries for host "[<SERVER NAME CHANGED TO PROTECT THE INNOCENT>]:2222" from file "/home/kevin/.ssh/known_hosts"
debug3: load_hostkeys: found key type RSA in file /home/kevin/.ssh/known_hosts:1
debug3: load_hostkeys: loaded 1 keys
debug3: order_hostkeyalgs: prefer hostkeyalgs: ssh-rsa-cert-v01@openssh.com,ssh-rsa-cert-v00@openssh.com,ssh-rsa
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
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-cert-v01@openssh.com,ssh-rsa-cert-v00@openssh.com,ssh-rsa,ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,ssh-dss-cert-v01@openssh.com,ssh-dss-cert-v00@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,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-sha2-256,hmac-sha2-256-96,hmac-sha2-512,hmac-sha2-512-96,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-sha2-256,hmac-sha2-256-96,hmac-sha2-512,hmac-sha2-512-96,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-group14-sha1,diffie-hellman-group1-sha1,diffie-hellman-group-exchange-sha1,diffie-hellman-group-exchange-sha256
debug2: kex_parse_kexinit: ssh-rsa
debug2: kex_parse_kexinit: aes128-cbc,aes192-cbc,aes256-cbc,3des-cbc,blowfish-cbc,aes128-ctr,aes192-ctr,aes256-ctr
debug2: kex_parse_kexinit: aes128-cbc,aes192-cbc,aes256-cbc,3des-cbc,blowfish-cbc,aes128-ctr,aes192-ctr,aes256-ctr
debug2: kex_parse_kexinit: hmac-sha1,hmac-md5,hmac-sha1-96,hmac-md5-96,hmac-sha256,hmac-sha256@ssh.com
debug2: kex_parse_kexinit: hmac-sha1,hmac-md5,hmac-sha1-96,hmac-md5-96,hmac-sha256,hmac-sha256@ssh.com
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: 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: 129/256
debug2: bits set: 513/1024
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug1: Server host key: RSA nn:nn:nn:nn:nn:nn:nn:nn:nn:nn:nn:nn:nn:nn:nn:nn
debug3: put_host_port: [nnn.nnn.nnn.nnn]:2222
debug3: put_host_port: [<SERVER NAME CHANGED TO PROTECT THE INNOCENT>]:2222
debug3: load_hostkeys: loading entries for host "[<SERVER NAME CHANGED TO PROTECT THE INNOCENT>]:2222" from file "/home/kevin/.ssh/known_hosts"
debug3: load_hostkeys: found key type RSA in file /home/kevin/.ssh/known_hosts:1
debug3: load_hostkeys: loaded 1 keys
debug3: load_hostkeys: loading entries for host "[nnn.nnn.nnn.nnn]:2222" from file "/home/kevin/.ssh/known_hosts"
debug3: load_hostkeys: found key type RSA in file /home/kevin/.ssh/known_hosts:2
debug3: load_hostkeys: loaded 1 keys
debug1: Host '[<SERVER NAME CHANGED TO PROTECT THE INNOCENT>]:2222' is known and matches the RSA host key.
debug1: Found key in /home/kevin/.ssh/known_hosts:1
debug2: bits set: 524/1024
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: /home/kevin/.ssh/id_dsa (0x7f221aa9f240)
debug2: key: /home/kevin/.ssh/id_rsa (0x7f221aa9f200)
debug2: key: /home/kevin/.ssh/id_ecdsa (0x7f221aaa09d0)
debug1: Authentications that can continue: password,publickey,keyboard-interactive
debug3: start over, passed a different list password,publickey,keyboard-interactive
debug3: preferred gssapi-keyex,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 DSA public key: /home/kevin/.ssh/id_dsa
debug3: send_pubkey_test
debug2: we sent a publickey packet, wait for reply
debug1: Authentications that can continue: password,publickey,keyboard-interactive
debug1: Offering RSA public key: /home/kevin/.ssh/id_rsa
debug3: send_pubkey_test
debug2: we sent a publickey packet, wait for reply
debug1: Authentications that can continue: password,publickey,keyboard-interactive
debug1: Offering ECDSA public key: /home/kevin/.ssh/id_ecdsa
debug3: send_pubkey_test
debug2: we sent a publickey packet, wait for reply
debug1: Authentications that can continue: password,publickey,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
Password Authentication
debug2: input_userauth_info_req: num_prompts 1
Password:
O arquivo allowed_key contém:
ssh-dss AAAAB3NzaC1kc3MAAACBA ... SQx9wCtDG8R3== kevin@ubuntu
ecdsa-sha2-nistp256 AAAAE2VjZHNhLXN ... pbrwdxE= kevin@ubuntu
ssh-rsa AAAAB3NzaC1 ... E5siYjCX3/b8qNjuGzPQoBRX kevin@ubuntu
(Eu terminei com três chaves, pois a saída de depuração mostrava que o sftp estava tentando todos os três tipos)
Isso mostra os direitos de acesso dos arquivos no servidor remoto:
sftp> ls -la
drwxr-x--- 1 1000025 1000025 4096 Dec 08 21:50 .
drwxr-x--- 1 1000025 1000025 4096 Dec 08 21:50 ..
drw------- 1 1000025 1000025 4096 Dec 08 02:03 .ssh
[snip]
sftp> cd .ssh
sftp> ls -la
drw------- 1 1000025 1000025 4096 Dec 08 02:03 .
drw------- 1 1000025 1000025 4096 Dec 08 02:03 ..
-r-------- 1 1000025 1000025 1170 Dec 08 02:03 authorized_keys
Minhas suspeitas são que:
- eles desativaram o acesso sem senha. Nesse caso, a saída acima é a esperada?
- Não estou usando o nome de usuário correto no arquivo allowed_keys
- Outra coisa completamente diferente
Realmente aprecio alguma ajuda nesse assunto, pois ele já consumiu uma quantidade irritante de tempo.
Depois de usar um script Expect, parece que terceiros desativaram todas as coisas úteis e nos forçaram a invadir esse script com senha em texto sem formatação.
—
Kevin Arranque