libssh - How to dynamically allow users in OpenSSH?

I want to be able to block or allow users based on the result of an external script using OpenSSH. I see that libssh has support for callbacks, but after reading the OpenSSH man pages I cannot find anywhere that this functionality is handed to the user.For example, I'd like to be able to maintain either a file or even an API that contains a username blacklist or whitelist, and have OpenSSH consult these lists during the authentication process.Ideas I've had so far, and why they are insufficient:Make use of sshd_config: AllowUsers. This is a sta...Read more

OPENSSH - unable to connect local windows through ssh

I installed openssh server using below url,https://howtech.tv/basics/how-to-install-openssh-to-windows/It installed successfully on my local machine which is windows 8.1 and my login is domain login. But when i am trying to connect to ssh server, it is throwing error saying "Permission denied" and after three attempts it comes out of ssh.ssh username@myhostnameIt asks for password but does not connect.username@myhostname's password:Permission denied, please try again.username@myhostname's password:Permission denied, please try again.username@my...Read more

Change log time format of OpenSSH

OpenSSH log in my system are spitting log in following format.Aug 21 14:34:44 systemHostName sshd[1952]: Server listening on 0.0.0.0 port 22.I need to get the year also, in the log time. something like following2012 Aug 21 14:34:44 systemHostName sshd[1952]: Server listening on 0.0.0.0 port 22.I tried to look into sshd_config and other web resources but could not find anything useful. Anybody know, how to change openSSH log time format?...Read more

beagleboneblack - Start OpenSSH sshd automatically on the BeagleBone Black

Does anybody know how to start sshd automatically on the BeagleBone Black ? I've replaced dropbear with OpenSSH. The standard systemctl enable sshd doesn't work, but strangely systemctl start sshd does. I'm quite new to systems with systemd replacing init, so hopefully I'm not just missing something trivial / simple. The BeagleBone Black in question is running Angstrom Linux and is using the opkg package manager. OpenSSH was installed with opkg install openssh. When I run systemctl enable sshd@.service, I get the following message:The unit file...Read more

terraform provider aws - aws_key_pair.auth: Error import KeyPair: InvalidKey.Format: Key is not in valid OpenSSH public key format

terraform to create an EC2 instance and use a public key to login to EC2 instance is not working.aws_key_pair.auth: Error import KeyPair: InvalidKey.Format: Key is not in valid OpenSSH public key formatthis is part of the main.tf to create a keypair main.tf resource "aws_key_pair" "auth" { key_name = "${var.key_name}" public_key = "${file(var.public_key_path)}" }declaring the variable variable.tf variable "public_key_path" { description = <<DESCRIPTION Path to the SSH public key to be used for authentica...Read more

openssh - ssh permission denied

I am trying to ssh into a remote machine and I get the following debug messages:debug1: Reading configuration data /etc/ssh/ssh_configdebug1: Applying options for *debug2: ssh_connect: needpriv 0debug1: Connecting to xxx.xxx.x.xx [xxx.xxx.xx.x] port 22.debug1: Connection established.debug3: Not a RSA1 key file /home/hadoop/.ssh/id_rsa.debug2: key_type_from_name: unknown key type '-----BEGIN'debug3: key_read: missing keytypedebug3: key_read: missing whitespacedebug3: key_read: missing whitespacedebug3: key_read: missing whitespacedebug3: key_rea...Read more

Can openssh be installed on MSYS?

I'm using MSYS in windows 7 and now i need it to provide ssh server service. can openssh be installed in msys like it is in cygwin? i can find ssh in /msys/bin, and it can be used as ssh client. but no server seems to be installed. how can i install one? i googled a lot but almost every theads leads to openssh in cygwin, that does not apply to my situation. i compared cygwin and msys and decide to use msys. We need to run some applications both built and supposed to be ran in windows. what i've tried:mingw-get install mysys-opensshtest@WIN-L3L6...Read more

GSS authentication for openssh client (Scientific Linux)

The task in hand is to look for an authentication mechanism from Linuix client (Scietific Linux 6.1) to a HyperV Server. I'm using openwsman to establish the connection; it seems openwsman does not support kerbose/gssapi as openssl/openssh internally used does not support the protocol. Googling about GSS and openssh support, I was able to find a git project maintained by Simon Wilkinson (https://github.com/SimonWilkinson/gss-openssh) and also a webpage maintaining the patches against openssh releases (http://www.sxw.org.uk/computing/patches/ope...Read more

vulnerability - If a CVE database lists my version of OpenSSH as vulnerable, is it possible that it has been patched but retains the version number?

I am using OpenSSH version 7.4p1, in CVE database I found that cpe:/a:openbsd:openssh:7.4:p1 is vulnerable to CVE-2017-15906 https://www.cvedetails.com/cve/CVE-2017-15906/.Does this mean that for sure my version is affected or is it possible that this version has the same number but is already patched? How can I verify this?...Read more

logs - Where does openssh-server get the "Last Login" information from?

Where does openssh-server get the "Last Login" information from?I recently logged in remotely from a Windows machine using SSH Secure Shell 3.2.9 and the reported last login was from a network location I do not recognize. I then checked auth.log (more specifically, auth.log.1) and found no log entries pertaining to the reported network location. I usually remote in via VPN so I know the IP of the computer logged-in changes. However, it typically takes the form of an IP address where as this particular attempt was recorded as unknownComputerName...Read more

Can I build openssh-portable source code in Alpine linux

For my projects I have to customize the openssh code and I am planning to build the openssh-portable(https://github.com/openssh/openssh-portable) source code in the Alpine linux. But I am getting the following error while doing so.*/home/openssh-portable # make(cd openbsd-compat && make)make[1]: Entering directory '/home/openssh-portable/openbsd-compat'cc -g -O2 -pipe -Wall -Wpointer-arith -Wuninitialized -Wsign-compare -Wformat-security -Wsizeof-pointer-memaccess -Wno-pointer-sign -Wno-unused-result -fno-strict-aliasing -D_FORTIFY_SOUR...Read more