Re: Authentication method

[Fabio Leone <fab.leo@xxxxxxxxx>]

Hello.
I just have to call ssh_userauth_none() more than once.
In fact, the function returns SSH_AUTH_AGAIN.

So problem solved.
Have a nice day.

Fabio



2014-07-13 11:27 GMT+02:00 Fabio Leone <fab.leo@xxxxxxxxx>:

>
> Hi guys.
> Here is the verbose log generated by following code with
> SSH_OPTIONS_LOG_VERBOSITY set to SSH_LOG_FUNCTIONS:
>
>   int verbosity = SSH_LOG_FUNCTIONS;
>
>   node.session = ssh_new ();
>
>   if (node.session == NULL)
>     return (NULL);
>
>   ssh_options_set (node.session, SSH_OPTIONS_HOST, p_auth->host);
>   ssh_options_set (node.session, SSH_OPTIONS_USER, p_auth->user);
>   ssh_options_set (node.session, SSH_OPTIONS_PORT, &p_auth->port);
>   ssh_options_set (node.session, SSH_OPTIONS_TIMEOUT, &prefs.ssh_timeout);
>   ssh_options_set (node.session, SSH_OPTIONS_LOG_VERBOSITY, &verbosity);
>
>   rc = ssh_connect (node.session);
>
>   printf ("calling ssh_userauth_none()...\n");
>   ssh_userauth_none (node.session, NULL);
>
>   printf ("calling ssh_userauth_list()...\n");
>
>   node.auth_methods = ssh_userauth_list (node.session, NULL);
>
>   printf ("returned value: %d\n", node.auth_methods);
>
> I notice that ssh_userauth_list() does not write any message.
> Could my problem be generated by a too short timeout value (2 seconds)?
>
> -- LOG: -----------------------------
> [2014/07/13 11:07:39.215006, 1] ssh_connect:  libssh 0.6.3 (c) 2003-2014
> Aris Adamantiadis, Andreas Schneider, and libssh contributors. Distributed
> under the LGPL, please refer to COPYING file for information about your
> rights, using threading threads_noop
> [2014/07/13 11:07:39.215050, 3] getai:  host 10.104.101.21 matches an IP
> address
> [2014/07/13 11:07:39.215141, 2] ssh_socket_connect:  Nonblocking
> connection socket: 15
> [2014/07/13 11:07:39.215165, 2] ssh_connect:  Socket connecting, now
> waiting for the callbacks to work
> [2014/07/13 11:07:39.215182, 3] ssh_connect:  ssh_connect: Actual timeout
> : 2000
> [2014/07/13 11:07:39.249256, 3] ssh_socket_pollcallback:  Received POLLOUT
> in connecting state
> [2014/07/13 11:07:39.249350, 1] socket_callback_connected:  Socket
> connection callback: 1 (0)
> [2014/07/13 11:07:39.418040, 3] callback_receive_banner:  Received banner:
> SSH-2.0-OpenSSH_5.1p1 Debian-5
> [2014/07/13 11:07:39.418127, 1] ssh_client_connection_callback:  SSH
> server banner: SSH-2.0-OpenSSH_5.1p1 Debian-5
> [2014/07/13 11:07:39.418204, 1] ssh_analyze_banner:  Analyzing banner:
> SSH-2.0-OpenSSH_5.1p1 Debian-5
> [2014/07/13 11:07:39.418238, 1] ssh_analyze_banner:  We are talking to an
> OpenSSH client version: 5.1 (50100)
> [2014/07/13 11:07:39.418266, 3] ssh_socket_unbuffered_write:  Enabling
> POLLOUT for socket
> [2014/07/13 11:07:39.462543, 3] ssh_packet_socket_callback:  packet: read
> type 20 [len=780,padding=10,comp=769,payload=769]
> [2014/07/13 11:07:39.462626, 3] ssh_packet_process:  Dispatching handler
> for packet type 20
> [2014/07/13 11:07:39.462680, 4] ssh_list_kex:  kex algos:
> diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
> [2014/07/13 11:07:39.462751, 4] ssh_list_kex:  server host key algo:
> ssh-rsa,ssh-dss
> [2014/07/13 11:07:39.462764, 4] ssh_list_kex:  encryption client->server:
> aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour128,arcfour256,arcfour,aes192-cbc,aes256-cbc,
> rijndael-cbc@xxxxxxxxxxxxxx,aes128-ctr,aes192-ctr,aes256-ctr
> [2014/07/13 11:07:39.462781, 4] ssh_list_kex:  encryption server->client:
> aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour128,arcfour256,arcfour,aes192-cbc,aes256-cbc,
> rijndael-cbc@xxxxxxxxxxxxxx,aes128-ctr,aes192-ctr,aes256-ctr
> [2014/07/13 11:07:39.462797, 4] ssh_list_kex:  mac algo client->server:
> hmac-md5,hmac-sha1,umac-64@xxxxxxxxxxx,hmac-ripemd160,
> hmac-ripemd160@xxxxxxxxxxx,hmac-sha1-96,hmac-md5-96
> [2014/07/13 11:07:39.462815, 4] ssh_list_kex:  mac algo server->client:
> hmac-md5,hmac-sha1,umac-64@xxxxxxxxxxx,hmac-ripemd160,
> hmac-ripemd160@xxxxxxxxxxx,hmac-sha1-96,hmac-md5-96
> [2014/07/13 11:07:39.462831, 4] ssh_list_kex:  compression algo
> client->server: none,zlib@xxxxxxxxxxx
> [2014/07/13 11:07:39.462845, 4] ssh_list_kex:  compression algo
> server->client: none,zlib@xxxxxxxxxxx
> [2014/07/13 11:07:39.462859, 4] ssh_list_kex:  languages client->server:
> [2014/07/13 11:07:39.462873, 4] ssh_list_kex:  languages server->client:
> [2014/07/13 11:07:39.462969, 3] match_hashed_host:  Matching a hashed
> host: 10.104.101.21 match=0
> [2014/07/13 11:07:39.463031, 3] match_hashed_host:  Matching a hashed
> host: [10.104.101.21]:22 match=0
> [2014/07/13 11:07:39.463084, 3] match_hashed_host:  Matching a hashed
> host: 10.104.101.21 match=0
> [2014/07/13 11:07:39.463132, 3] match_hashed_host:  Matching a hashed
> host: [10.104.101.21]:22 match=0
> [2014/07/13 11:07:39.463156, 3] match_hashed_host:  Matching a hashed
> host: 10.104.101.21 match=0
> [2014/07/13 11:07:39.463178, 3] match_hashed_host:  Matching a hashed
> host: [10.104.101.21]:22 match=0
> [2014/07/13 11:07:39.463202, 3] match_hashed_host:  Matching a hashed
> host: 10.104.101.21 match=0
> [2014/07/13 11:07:39.463224, 3] match_hashed_host:  Matching a hashed
> host: [10.104.101.21]:22 match=0
> [2014/07/13 11:07:39.463250, 3] match_hashed_host:  Matching a hashed
> host: 10.104.101.21 match=0
> [2014/07/13 11:07:39.463273, 3] match_hashed_host:  Matching a hashed
> host: [10.104.101.21]:22 match=0
> [2014/07/13 11:07:39.463295, 3] match_hashed_host:  Matching a hashed
> host: 10.104.101.21 match=0
> [2014/07/13 11:07:39.463318, 3] match_hashed_host:  Matching a hashed
> host: [10.104.101.21]:22 match=0
> [2014/07/13 11:07:39.463341, 3] match_hashed_host:  Matching a hashed
> host: 10.104.101.21 match=0
> [2014/07/13 11:07:39.463363, 3] match_hashed_host:  Matching a hashed
> host: [10.104.101.21]:22 match=0
> [2014/07/13 11:07:39.463386, 3] match_hashed_host:  Matching a hashed
> host: 10.104.101.21 match=0
> [2014/07/13 11:07:39.463419, 3] match_hashed_host:  Matching a hashed
> host: [10.104.101.21]:22 match=0
> [2014/07/13 11:07:39.463447, 3] match_hashed_host:  Matching a hashed
> host: 10.104.101.21 match=0
> [2014/07/13 11:07:39.463475, 3] match_hashed_host:  Matching a hashed
> host: [10.104.101.21]:22 match=0
> [2014/07/13 11:07:39.463496, 3] match_hashed_host:  Matching a hashed
> host: 10.104.101.21 match=0
> [2014/07/13 11:07:39.463522, 3] match_hashed_host:  Matching a hashed
> host: [10.104.101.21]:22 match=0
> [2014/07/13 11:07:39.463542, 3] match_hashed_host:  Matching a hashed
> host: 10.104.101.21 match=0
> [2014/07/13 11:07:39.463559, 3] match_hashed_host:  Matching a hashed
> host: [10.104.101.21]:22 match=0
> [2014/07/13 11:07:39.463577, 3] match_hashed_host:  Matching a hashed
> host: 10.104.101.21 match=0
> [2014/07/13 11:07:39.463594, 3] match_hashed_host:  Matching a hashed
> host: [10.104.101.21]:22 match=0
> [2014/07/13 11:07:39.463612, 3] match_hashed_host:  Matching a hashed
> host: 10.104.101.21 match=0
> [2014/07/13 11:07:39.463626, 3] match_hashed_host:  Matching a hashed
> host: [10.104.101.21]:22 match=0
> [2014/07/13 11:07:39.463641, 3] match_hashed_host:  Matching a hashed
> host: 10.104.101.21 match=0
> [2014/07/13 11:07:39.463656, 3] match_hashed_host:  Matching a hashed
> host: [10.104.101.21]:22 match=0
> [2014/07/13 11:07:39.463672, 3] match_hashed_host:  Matching a hashed
> host: 10.104.101.21 match=0
> [2014/07/13 11:07:39.463686, 3] match_hashed_host:  Matching a hashed
> host: [10.104.101.21]:22 match=0
> [2014/07/13 11:07:39.463701, 3] match_hashed_host:  Matching a hashed
> host: 10.104.101.21 match=0
> [2014/07/13 11:07:39.463715, 3] match_hashed_host:  Matching a hashed
> host: [10.104.101.21]:22 match=0
> [2014/07/13 11:07:39.463731, 3] match_hashed_host:  Matching a hashed
> host: 10.104.101.21 match=0
> [2014/07/13 11:07:39.463745, 3] match_hashed_host:  Matching a hashed
> host: [10.104.101.21]:22 match=0
> [2014/07/13 11:07:39.463760, 3] match_hashed_host:  Matching a hashed
> host: 10.104.101.21 match=0
> [2014/07/13 11:07:39.463775, 3] match_hashed_host:  Matching a hashed
> host: [10.104.101.21]:22 match=0
> [2014/07/13 11:07:39.463790, 3] match_hashed_host:  Matching a hashed
> host: 10.104.101.21 match=0
> [2014/07/13 11:07:39.463805, 3] match_hashed_host:  Matching a hashed
> host: [10.104.101.21]:22 match=0
> [2014/07/13 11:07:39.463820, 3] match_hashed_host:  Matching a hashed
> host: 10.104.101.21 match=0
> [2014/07/13 11:07:39.463834, 3] match_hashed_host:  Matching a hashed
> host: [10.104.101.21]:22 match=0
> [2014/07/13 11:07:39.463851, 3] match_hashed_host:  Matching a hashed
> host: 10.104.101.21 match=0
> [2014/07/13 11:07:39.463865, 3] match_hashed_host:  Matching a hashed
> host: [10.104.101.21]:22 match=0
> [2014/07/13 11:07:39.463880, 3] match_hashed_host:  Matching a hashed
> host: 10.104.101.21 match=0
> [2014/07/13 11:07:39.463895, 3] match_hashed_host:  Matching a hashed
> host: [10.104.101.21]:22 match=0
> [2014/07/13 11:07:39.463910, 3] match_hashed_host:  Matching a hashed
> host: 10.104.101.21 match=0
> [2014/07/13 11:07:39.463924, 3] match_hashed_host:  Matching a hashed
> host: [10.104.101.21]:22 match=0
> [2014/07/13 11:07:39.463976, 4] ssh_list_kex:  kex algos:
> curve25519-sha256@xxxxxxxxxx
> ,ecdh-sha2-nistp256,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
> [2014/07/13 11:07:39.463989, 4] ssh_list_kex:  server host key algo:
> ecdsa-sha2-nistp256,ssh-rsa,ssh-dss
> [2014/07/13 11:07:39.464008, 4] ssh_list_kex:  encryption client->server:
> aes256-ctr,aes192-ctr,aes128-ctr,aes256-cbc,aes192-cbc,aes128-cbc,blowfish-cbc,3des-cbc,des-cbc-ssh1
> [2014/07/13 11:07:39.464017, 4] ssh_list_kex:  encryption server->client:
> aes256-ctr,aes192-ctr,aes128-ctr,aes256-cbc,aes192-cbc,aes128-cbc,blowfish-cbc,3des-cbc,des-cbc-ssh1
> [2014/07/13 11:07:39.464027, 4] ssh_list_kex:  mac algo client->server:
> hmac-sha1
> [2014/07/13 11:07:39.464036, 4] ssh_list_kex:  mac algo server->client:
> hmac-sha1
> [2014/07/13 11:07:39.464045, 4] ssh_list_kex:  compression algo
> client->server: none
> [2014/07/13 11:07:39.464054, 4] ssh_list_kex:  compression algo
> server->client: none
> [2014/07/13 11:07:39.464063, 4] ssh_list_kex:  languages client->server:
> [2014/07/13 11:07:39.464071, 4] ssh_list_kex:  languages server->client:
> [2014/07/13 11:07:39.464101, 3] ssh_socket_unbuffered_write:  Enabling
> POLLOUT for socket
> [2014/07/13 11:07:39.464123, 3] packet_send2:  packet: wrote
> [len=436,padding=10,comp=425,payload=425]
> [2014/07/13 11:07:39.464475, 3] packet_send2:  packet: wrote
> [len=268,padding=5,comp=262,payload=262]
> [2014/07/13 11:07:39.464494, 3] ssh_socket_unbuffered_write:  Enabling
> POLLOUT for socket
> [2014/07/13 11:07:39.825566, 3] ssh_packet_socket_callback:  packet: read
> type 31 [len=828,padding=10,comp=817,payload=817]
> [2014/07/13 11:07:39.825650, 3] ssh_packet_process:  Dispatching handler
> for packet type 31
> [2014/07/13 11:07:39.825728, 2] ssh_packet_dh_reply:  Received
> SSH_KEXDH_REPLY
> [2014/07/13 11:07:39.826669, 3] ssh_socket_unbuffered_write:  Enabling
> POLLOUT for socket
> [2014/07/13 11:07:39.826717, 3] packet_send2:  packet: wrote
> [len=12,padding=10,comp=1,payload=1]
> [2014/07/13 11:07:39.826753, 2] ssh_client_dh_reply:  SSH_MSG_NEWKEYS sent
> [2014/07/13 11:07:39.826812, 3] ssh_packet_socket_callback:  Processing 16
> bytes left in socket buffer
> [2014/07/13 11:07:39.826850, 3] ssh_packet_socket_callback:  packet: read
> type 21 [len=12,padding=10,comp=1,payload=1]
> [2014/07/13 11:07:39.826887, 3] ssh_packet_process:  Dispatching handler
> for packet type 21
> [2014/07/13 11:07:39.826923, 2] ssh_packet_newkeys:  Received
> SSH_MSG_NEWKEYS
> [2014/07/13 11:07:39.827006, 3] crypt_set_algorithms2:  Set output
> algorithm to aes256-ctr
> [2014/07/13 11:07:39.827045, 3] crypt_set_algorithms2:  Set input
> algorithm to aes256-ctr
> [2014/07/13 11:07:39.827150, 4] ssh_pki_signature_verify_blob:  Going to
> verify a ssh-rsa type signature
> [2014/07/13 11:07:39.827354, 2] ssh_packet_newkeys:  Signature verified
> and valid
> [2014/07/13 11:07:39.827399, 3] ssh_connect:  ssh_connect: Actual state : 7
> calling ssh_userauth_none()...
> [2014/07/13 11:07:39.830043, 3] packet_send2:  packet: wrote
> [len=28,padding=10,comp=17,payload=17]
> [2014/07/13 11:07:39.830137, 3] ssh_service_request:  Sent
> SSH_MSG_SERVICE_REQUEST (service ssh-userauth)
> [2014/07/13 11:07:39.830187, 3] ssh_socket_unbuffered_write:  Enabling
> POLLOUT for socket
> [2014/07/13 11:07:39.910069, 3] ssh_packet_socket_callback:  packet: read
> type 6 [len=28,padding=10,comp=17,payload=17]
> [2014/07/13 11:07:39.910150, 3] ssh_packet_process:  Dispatching handler
> for packet type 6
> [2014/07/13 11:07:39.910223, 3] ssh_packet_service_accept:  Received
> SSH_MSG_SERVICE_ACCEPT
> [2014/07/13 11:07:39.910311, 3] ssh_socket_unbuffered_write:  Enabling
> POLLOUT for socket
> [2014/07/13 11:07:39.910362, 3] packet_send2:  packet: wrote
> [len=44,padding=8,comp=35,payload=35]
> calling ssh_userauth_list()...
> returned value: 0
>
>
>
> 2014-07-12 21:43 GMT+02:00 Aris Adamantiadis <aris@xxxxxxxxxxxx>:
>
> Hi Fabio,
>>
>> This looks correct. Could you provide us the verbose log so we can see
>> what the server is sending back?
>> Thanks,
>>
>> Aris
>>
>> Le 12/07/14 10:28, Fabio Leone a écrit :
>> > Hi.
>> > I'm using libssh version 0.6.3.
>> > When logging in on some servers ssh_userauth_list() returns zero (I
>> > call ssh_userauth_none before).
>> > What is the right way to access the server in that case?
>> >
>> > This is a snippet of my code:
>> >
>> >   ssh_userauth_none (node.session, NULL);
>> >   node.auth_methods = ssh_userauth_list (node.session, NULL);
>> >
>> >   if (node.auth_methods & SSH_AUTH_METHOD_PASSWORD)
>> >     {
>> >       ...
>> >     }
>> >   else if (node.auth_methods & SSH_AUTH_METHOD_INTERACTIVE)
>> >     {
>> >       ...
>> >     }
>> >   else if ...
>> >      ...
>> >   else
>> >     {
>> >       sprintf (p_auth->error_s, "Unknown authentication method for
>> > server %s\n", p_auth->host);
>> >       ...
>> >     }
>>
>>
>>
>