08-28-2007
Passwordless authentication via SSH
I am trying to implement passwordless authentication via ssh2. I have used the well documented technique of generating a key pair with a blank passphrase on my client machine, and installing the public key on the destination server (AIX 5.3) in the user's .ssh2 directory. I have used this technique successfully in the past on other flavours of Unix.
However when I connect (e.g. using sftp2) it still asks for a password, and I have to supply the user's Unix account password before it lets me in. What have I missed? Is there a setting somewhere else that is overriding those in the sshd2 config file?
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LEARN ABOUT PHP
ssh2_publickey_list
SSH2_PUBLICKEY_LIST(3) 1 SSH2_PUBLICKEY_LIST(3)
ssh2_publickey_list - List currently authorized publickeys
SYNOPSIS
array ssh2_publickey_list (resource $pkey)
DESCRIPTION
List currently authorized publickeys.
PARAMETERS
o $pkey
- Publickey Subsystem resource
RETURN VALUES
Returns a numerically indexed array of keys, each of which is an associative array containing: name, blob, and attrs elements.
Publickey elements
+----------+---------------------------------------------------+
|Array Key | |
| | |
| | Meaning |
| | |
+----------+---------------------------------------------------+
| name | |
| | |
| | Name of algorithm used by this publickey, for |
| | example: ssh-dss or ssh-rsa. |
| | |
| blob | |
| | |
| | Publickey blob as raw binary data. |
| | |
| attrs | |
| | |
| | Attributes assigned to this publickey. The most |
| | common attribute, and the only one supported by |
| | publickey version 1 servers, is comment, which |
| | may be any freeform string. |
| | |
+----------+---------------------------------------------------+
EXAMPLES
Example #1
Listing authorized keys with ssh2_publickey_list(3)
<?php
$ssh2 = ssh2_connect('shell.example.com', 22);
ssh2_auth_password($ssh2, 'jdoe', 'secret');
$pkey = ssh2_publickey_init($ssh2);
$list = ssh2_publickey_list($pkey);
foreach($list as $key) {
echo "Key: {$key['name']}
";
echo "Blob: " . chunk_split(base64_encode($key['blob']), 40, "
") . "
";
echo "Comment: {$key['attrs']['comment']}
";
}
?>
The above example will output:
Key: ssh-rsa
Blob: AAAAB3NzaC1yc2EAAAABIwAAAIEA5HVt6VqSGd5P
TrLRdjNONxXH1tVFGn0Bd26BF0aCP9qyJRlvdJ3j
4WBeX4ZmrveGrjMgkseSYc4xZ26sDHwfL351xjza
LpipuBGRrw17mWVBhuCExo476ri5tQFzbTc54VE
HYckxQ16CjSTibI5X69GmnYC9PNqEYq/1TP+HF10
Comment: John's Key
Key: ssh-rsa
Blob: AAAAB3NzaHVt6VqSGd5C1yc2EAAAABIwA232dnJA
AIEA5HVt6VqSGd5PTrLRdjNONxX/1TP+HF1HVt6V
qSGd50H1tVFGn0BB3NzaC1yc2EAd26BF0aCP9qyJ
RlvdJ3j4WBeX4ZmrveGrjMgkseSYc4xZ26HVt6Vq
SGd5sDHwfL351xjzaLpipuBGB3NzaC1yc2EA/1T
Comment: Alice's Key
NOTES
Note
The public key subsystem is used for managing public keys on a server to which the client is already authenticated. To authenticate
to a remote system using public key authentication, use the ssh2_auth_pubkey_file(3) function instead.
SEE ALSO
ssh2_publickey_init(3), ssh2_publickey_add(3), ssh2_publickey_remove(3).
PHP Documentation Group SSH2_PUBLICKEY_LIST(3)