author | Oleksandr Gavenko <gavenkoa@gmail.com> |
Wed, 06 Apr 2022 19:31:47 +0300 | |
changeset 2520 | 787ff2658636 |
parent 2408 | c19423f2e7ee |
child 2538 | 1f827ee55f7c |
permissions | -rw-r--r-- |
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Include common header with quick links.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
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.. -*- coding: utf-8; -*- |
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=========== |
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SSH/sshd. |
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=========== |
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Fix coding and contents.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1002
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.. contents:: |
1904 | 7 |
:local: |
1002 | 8 |
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acb36dfe5d09
Debugging ssh client.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1384
diff
changeset
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Debugging ssh client. |
acb36dfe5d09
Debugging ssh client.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1384
diff
changeset
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===================== |
acb36dfe5d09
Debugging ssh client.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1384
diff
changeset
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:: |
acb36dfe5d09
Debugging ssh client.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1384
diff
changeset
|
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|
acb36dfe5d09
Debugging ssh client.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1384
diff
changeset
|
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$ ssh -vvv ... |
acb36dfe5d09
Debugging ssh client.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1384
diff
changeset
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2397 | 15 |
Maintaining key pair |
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==================== |
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1957
cd6f239a8dd3
Check available key types.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1956
diff
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cd6f239a8dd3
Check available key types.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1956
diff
changeset
|
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Check available key types:: |
cd6f239a8dd3
Check available key types.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1956
diff
changeset
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cd6f239a8dd3
Check available key types.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1956
diff
changeset
|
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$ ssh -Q key |
cd6f239a8dd3
Check available key types.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1956
diff
changeset
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cd6f239a8dd3
Check available key types.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1956
diff
changeset
|
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Generate keys:: |
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$ ssh-keygen -t dsa # for DSA |
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$ ssh-keygen -t rsa # for RSA |
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$ ssh-keygen -t dsa -C comment # put own comment instead user@host |
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$ ssh-keygen -t dsa -f my_dsa_key # store priv key under my_dsa_key |
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# and pub key under my_dsa_key.pub |
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ssh-keygen -f my.key |
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Recover pub key from priv.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2397
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changeset
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Recover pub key from priv:: |
c19423f2e7ee
Recover pub key from priv.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2397
diff
changeset
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2520 | 34 |
ssh-keygen -y -f ~/.ssh/id_dsa >~/.ssh/id_dsa.pub |
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Show fingerprint:: |
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ssh-keygen -l -f ~/.ssh/id_dsa |
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c19423f2e7ee
Recover pub key from priv.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2397
diff
changeset
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c19423f2e7ee
Recover pub key from priv.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2397
diff
changeset
|
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Change passphrase of priv key:: |
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$ ssh-keygen -p -N "newphrase" -P "oldphrase" -f ~/.ssh/id_dsa |
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Coping and deleting public keys |
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=============================== |
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c6dc48292ee8
Coping and deleting public keys.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1680
diff
changeset
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46 |
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c6dc48292ee8
Coping and deleting public keys.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1680
diff
changeset
|
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To copy your public key to remote host (for automatic login by pubkey |
c6dc48292ee8
Coping and deleting public keys.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1680
diff
changeset
|
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authentication):: |
c6dc48292ee8
Coping and deleting public keys.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1680
diff
changeset
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$ ssh $user@$host cat ">>" "~/.ssh/authorized_keys" <~/.ssh/id_rsa.pub |
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# public pub key on remote host |
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$ ssh-copy-id $user@$host # alternative to previous command |
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1858
c6dc48292ee8
Coping and deleting public keys.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1680
diff
changeset
|
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To remove ``known_hosts`` key (usually need if you change server pubkey or |
c6dc48292ee8
Coping and deleting public keys.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1680
diff
changeset
|
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change server):: |
c6dc48292ee8
Coping and deleting public keys.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1680
diff
changeset
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c6dc48292ee8
Coping and deleting public keys.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1680
diff
changeset
|
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$ ssh-keygen -R hostname |
c6dc48292ee8
Coping and deleting public keys.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1680
diff
changeset
|
59 |
$ ssh-keygen -R hostname -f ~/.ssh/known_hosts |
c6dc48292ee8
Coping and deleting public keys.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1680
diff
changeset
|
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Disabling pubkey |
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================ |
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:: |
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ssh -o PreferredAuthentications=password -o PubkeyAuthentication=no user@host |
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Shell login. |
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============ |
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:: |
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$ ssh $user@$host |
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$ ssh $user@$host:$port |
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$ ssh -i ~/.ssh/my_dsa_key $user@$host |
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or:: |
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$ ssh -l $user $host |
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$ ssh -l $user $host:$port |
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X11 forwarding |
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============== |
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Enable X11 forwarding on remote host in ``~/.ssh/config`` or ``/etc/ssh_config``:: |
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X11Forwarding yes |
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then login to this host by:: |
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$ ssh -X $user@$host |
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or by using trusted X11 forwarding:: |
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$ ssh -Y $user@$host |
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X11Forwarding does not work with OpenSSH under Cygwin
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1385
diff
changeset
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See: |
864237ce5f1b
X11Forwarding does not work with OpenSSH under Cygwin
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1385
diff
changeset
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Removed indentation that compiled into <blockquote>.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1957
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http://x.cygwin.com/docs/faq/cygwin-x-faq.html#q-ssh-no-x11forwarding |
837f1337c59b
Removed indentation that compiled into <blockquote>.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1957
diff
changeset
|
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X11Forwarding does not work with OpenSSH under Cygwin |
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Multiply private keys |
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===================== |
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``ssh`` tries to use all provided keys:: |
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$ ssh -i ./priv1 -i ./priv2 $user@$host |
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Alternatively place them to ``~/.ssh/config``:: |
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Host * |
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IdentityFile ~/.ssh/identity # standard search path for protocol ver. 1 |
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IdentityFile ~/.ssh/id_dsa # standard search path for RSA key protocol ver. 2 |
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IdentityFile ~/.ssh/id_rsa # standard search path for DSA key protocol ver. 2 |
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IdentityFile ~/.ssh/my_dsa |
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IdentityFile ~/.ssh/another_dsa |
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or per host private key:: |
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Host host1 # alias, that user provide at CLI |
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HostName host1.example.com # real host name to log into |
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User iam |
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IdentifyFile ~/.ssh/iam_priv_dsa |
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Host host2 # alias, that user provide at CLI |
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HostName 192.168.1.2 # real host IP to log into |
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User admin |
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IdentifyFile ~/.ssh/admin_priv_dsa |
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Installing sshd on Cygwin |
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========================= |
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* Install base packages and openssh. |
1954
307ce848ea6a
Update instruction for sshd under Cygwin.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1912
diff
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* Create Windows user and set its password. |
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* Recreate /etc/passwd:: |
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$ mkpasswd -l -u user >>/etc/passwd |
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or:: |
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$ mkpasswd -l >/etc/passwd |
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* Register sshd:: |
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$ mkdir -p /home/user |
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$ ssh-host-config -y |
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* Start:: |
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$ net start sshd |
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or:: |
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$ cygrunsrv -S sshd |
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* Check from remote host:: |
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$ ssh $gygwin_host -l user |
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To stop service use:: |
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$ net stop sshd |
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connection closed fix.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1626
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$ cygrunsrv -E sshd |
1002 | 162 |
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1954
307ce848ea6a
Update instruction for sshd under Cygwin.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1912
diff
changeset
|
163 |
To delete service:: |
307ce848ea6a
Update instruction for sshd under Cygwin.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1912
diff
changeset
|
164 |
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307ce848ea6a
Update instruction for sshd under Cygwin.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1912
diff
changeset
|
165 |
$ cygrunsrv -E sshd |
307ce848ea6a
Update instruction for sshd under Cygwin.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1912
diff
changeset
|
166 |
$ cygrunsrv -R sshd |
307ce848ea6a
Update instruction for sshd under Cygwin.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1912
diff
changeset
|
167 |
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1680
826133768ee5
connection closed fix.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1626
diff
changeset
|
168 |
If you have ``connection closed`` error check permission for ``/home/*/.ssh`` |
826133768ee5
connection closed fix.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1626
diff
changeset
|
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directories. If you start service from ``user`` account - add write permission |
826133768ee5
connection closed fix.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1626
diff
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to ``/home/*/.ssh``. I fix by:: |
1002 | 171 |
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1680
826133768ee5
connection closed fix.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1626
diff
changeset
|
172 |
$ rm -r /home/*/.ssh |
826133768ee5
connection closed fix.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1626
diff
changeset
|
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cmd> icacls c:\opt\cygwin\home /t /grant:r cyg_server:(f) |
1002 | 174 |
|
1954
307ce848ea6a
Update instruction for sshd under Cygwin.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1912
diff
changeset
|
175 |
In order to enable logging from ``sshd`` uncomment in ``/etc/ssh/sshd_config``:: |
1002 | 176 |
|
1954
307ce848ea6a
Update instruction for sshd under Cygwin.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1912
diff
changeset
|
177 |
SyslogFacility AUTH |
307ce848ea6a
Update instruction for sshd under Cygwin.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1912
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|
178 |
LogLevel INFO |
1002 | 179 |
|
1954
307ce848ea6a
Update instruction for sshd under Cygwin.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1912
diff
changeset
|
180 |
and start syslogd from ``inetutils`` package (don't forget to restart |
307ce848ea6a
Update instruction for sshd under Cygwin.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1912
diff
changeset
|
181 |
``sshd``!):: |
1002 | 182 |
|
1954
307ce848ea6a
Update instruction for sshd under Cygwin.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1912
diff
changeset
|
183 |
$ /bin/syslogd-config |
307ce848ea6a
Update instruction for sshd under Cygwin.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1912
diff
changeset
|
184 |
$ net start syslogd |
1002 | 185 |
|
1954
307ce848ea6a
Update instruction for sshd under Cygwin.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1912
diff
changeset
|
186 |
Check ``/var/log/messages`` for logging messages. |
1955
62735335fcef
userauth_pubkey: key type ssh-dss not in PubkeyAcceptedKeyTypes
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1954
diff
changeset
|
187 |
|
62735335fcef
userauth_pubkey: key type ssh-dss not in PubkeyAcceptedKeyTypes
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1954
diff
changeset
|
188 |
.. note:: |
62735335fcef
userauth_pubkey: key type ssh-dss not in PubkeyAcceptedKeyTypes
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1954
diff
changeset
|
189 |
|
62735335fcef
userauth_pubkey: key type ssh-dss not in PubkeyAcceptedKeyTypes
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1954
diff
changeset
|
190 |
In order to allow pubkey login and to avoid error:: |
62735335fcef
userauth_pubkey: key type ssh-dss not in PubkeyAcceptedKeyTypes
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1954
diff
changeset
|
191 |
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62735335fcef
userauth_pubkey: key type ssh-dss not in PubkeyAcceptedKeyTypes
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1954
diff
changeset
|
192 |
userauth_pubkey: key type ssh-dss not in PubkeyAcceptedKeyTypes |
62735335fcef
userauth_pubkey: key type ssh-dss not in PubkeyAcceptedKeyTypes
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1954
diff
changeset
|
193 |
|
1956
5f39abb7d5b0
DSS keys are depricated at all
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1955
diff
changeset
|
194 |
add ``PubkeyAcceptedKeyTypes *`` or ``PubkeyAcceptedKeyTypes=+ssh-dss`` to |
5f39abb7d5b0
DSS keys are depricated at all
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1955
diff
changeset
|
195 |
``/etc/ssh/sshd_config`` but DSS keys are depricated at all. |
1955
62735335fcef
userauth_pubkey: key type ssh-dss not in PubkeyAcceptedKeyTypes
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1954
diff
changeset
|
196 |