SFTP não alterna para o modo de senha

Question

Dois servidores, configurações sincronizadas e ssh keys. Ao conectar-se ao destino, o primeiro servidor alternou para o modo de senha:

debug1: Authentications that can continue: password,publickey,keyboard-interactive
debug3: start over, passed a different list password,publickey,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: /root/.ssh/id_dsa
debug3: send_pubkey_test
debug2: we sent a publickey packet, wait for reply
debug1: Server accepts key: pkalg ssh-dss blen 433
debug2: input_userauth_pk_ok: fp xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx
debug3: sign_and_send_pubkey
debug1: read PEM private key done: type DSA
Authenticated with partial success.
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:

Enquanto o segundo servidor entra em loop infinito:

debug1: Authentications that can continue: password,publickey,keyboard-interactive
debug1: Next authentication method: publickey
debug1: Offering DSA public key: /root/.ssh/id_dsa
debug2: we sent a publickey packet, wait for reply
debug1: Server accepts key: pkalg ssh-dss blen 433
debug2: input_userauth_pk_ok: fp xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx [MD5]
debug1: key_parse_private2: missing begin marker
debug1: read PEM private key done: type DSA
Authenticated with partial success.
debug2: key: /root/.ssh/id_dsa ((nil)), explicit
debug1: Authentications that can continue: password,publickey,keyboard-interactive
debug1: Trying private key: /root/.ssh/id_dsa
debug1: key_parse_private2: missing begin marker
debug1: read PEM private key done: type DSA
debug2: we sent a publickey packet, wait for reply
Authenticated with partial success.
debug2: key: /root/.ssh/id_dsa ((nil)), explicit
debug1: Authentications that can continue: password,publickey,keyboard-interactive
debug1: Trying private key: /root/.ssh/id_dsa
debug1: key_parse_private2: missing begin marker
debug1: read PEM private key done: type DSA
debug2: we sent a publickey packet, wait for reply
Authenticated with partial success.
debug2: key: /root/.ssh/id_dsa ((nil)), explicit
debug1: Authentications that can continue: password,publickey,keyboard-interactive
debug1: Trying private key: /root/.ssh/id_dsa
debug1: key_parse_private2: missing begin marker
debug1: read PEM private key done: type DSA
debug2: we sent a publickey packet, wait for reply
Authenticated with partial success.
debug2: key: /root/.ssh/id_dsa ((nil)), explicit
debug1: Authentications that can continue: password,publickey,keyboard-interactive
debug1: Trying private key: /root/.ssh/id_dsa
debug1: key_parse_private2: missing begin marker
debug1: read PEM private key done: type DSA
debug2: we sent a publickey packet, wait for reply
....

Alguma ideia do porquê?

    

Answer 1

Parece que o problema era com o binário do cliente ssh:

OpenSSH_6.6.1p1, OpenSSL 0.9.8j-fips 07 Jan 2009

Depois de copiar o binário ssh antigo, consigo conectar-me ao servidor de destino.

    

Answer 2

Eu tenho uma situação ligeiramente diferente. Eu tenho um script que baixa arquivos do servidor remoto por sftp com autenticação de senha (com a ajuda de esperar). Quando atualizei o sistema operacional (Solaris10 x86), o sftp parou repentinamente de perguntar a senha:

$ sftp -b batches/batch_file [email protected]
Permission denied (password).
Connection closed

Quando adicionei -o BatchMode=no à linha de comando, o prompt de senha apareceu:

$ sftp -o BatchMode=no -b batches/batch_file  [email protected]
[email protected]'s password: