1

I have two hosts with Red Hat 7.4 , HostA and HostB.
The rsh-server and rsh packages was installed in both.
At both hosts, the rsh deamon was activated, the commands rsh,rlogin,rexec was added to /etc/securetty, at /etc/hosts.equiv the HostA and HostB was added.

From hostA, with root, when I run rsh hostb, connects successfully without ask password.
From hostA, with any other user, give the error : rcmd: socket: Permission denied.

From hostB, with root, when I run rsh hosta, connects successfully without ask password.
From hostB, with any other user, connects successfully without ask password.

I already try add the set bit : chmod +a $(which rsh) , but have no effect. The SELINUX is disabled on both hosts.
The firewall is disabled on both hosts.

Improve this question
3
  • 1
    Try giving rsh and the user CAP_NET_ADMIN or CAP_NET_BIND_SERVICE (see stackoverflow.com/questions/1956732/… for more info) Commented Feb 26, 2018 at 15:17
  • I update my question with more details. As you can see they work only from one host to another, but not the inverse. Commented Feb 26, 2018 at 15:33
  • be sure that rsh is not ssh in disguise, from memory access control is set by host.allow/host.deny and .rhosts in $HOME dir. Commented Feb 26, 2018 at 15:35

1 Answer 1

Reset to default
2

I got this solved.
But unfortunately I do not discover why this happen.

When I run at hostA :

# getcap /bin/rsh

They return nothing.
At hostB they return :

getcap /bin/rsh
/bin/rsh = cap_net_bind_service+ep

I just remove the package and reinstalled using yum and then they get the permissions.

But why that occur at first ? What is missing at first time it was installed ? Weird.

Improve this answer
1
  • 1
    You can run rpm -V $(rpm -q -f /usr/bin/rsh) periodically to make sure it's still installed correctly. Commented Feb 26, 2018 at 18:55

You must log in to answer this question.

Start asking to get answers

Find the answer to your question by asking.

Ask question

Explore related questions

See similar questions with these tags.