I have a Postfix mail server running on my eMac, and been looking at /var/log/mail.log.
I am new to administrating a mail server.
I notice some servers tried to relay messages to unkown recipients in my server, and my Postfix denied access. The "from" and "rcpt to" look very phony.
I did a... (3 Replies)
Can other users delete / replace this file if the directory and file have the following permissions
/test drwxrwxrwx
/test/file _rw_r__r__
I guess what I really want to know is what the security riskis of having teh directory completely open when the access to a particular file is... (3 Replies)
I just wanted to know when dealing with key loggers, What would be a normal routine for searching them out. I really don't know what I am looking for other than odd process. Also packet sniffers. What are signs? (0 Replies)
Hi there,
Due to limited resource available in my network, I had to allow users comming from internet to telnet my SCO UNIXWARE box directly, like:
telnet 23.1.1.2, anyone can access. I can't make it secure based on IP addresses or hostnames since IP address is dynamic. I have made all the... (9 Replies)
Hi,
I have a question about the Java that comes with the Solaris 9/10 OS.
All my boxes are servers, only ssh allowed, no x windows, hardened, firewaled, etc...
Their purpose is Oracle DB's and Sun One Dir servers. None of which use the OS version of Java as far as know.
Question IS, can... (1 Reply)
This may seems simple but I am unaware of this.
Is there anyway to fetch the date & time of a user ID created on AIX? (actually I need answer for HP-UX,Solaris & Linux as well. But AIX is what I am most interested in.)
I use ls command but it does not show the creation date. It just shows the... (2 Replies)
Hello everyone ,
I want to implement a new firewall, detection system on my network composed of some 200 computers as follows: The fire wall would be a linux box with router, L7 iptable and also snort as IDPS system. These are my questions:
1. Is there any security consideration regarding... (0 Replies)
Hi,
Recently my has been hacked. A .pl script has been uploaded in the root of the directory, which uploaded lot of unwanted files and changed their file permission to 777.
I have no clue how did they upload that .pl file in my hosting.
Website is in shared hosting. Could they access my web... (3 Replies)
Recently the network auditor found a security hole at port 50000. The port 50000 is used by db2.
When I enter command "netstat -Aan |grep 50000", it showed some established connections and are all db2 processes.
I have asked the application team and they answered that the port 50000 connection... (2 Replies)
Discussion started by: skeyeung
2 Replies
LEARN ABOUT OSF1
rsh
rsh(1) General Commands Manual rsh(1)NAME
rsh - Executes the specified command at the remote host or logs into a remote host
SYNOPSIS
rsh [-dn] [-l user] remote_host [command] [argument...]
The remote shell command (rsh) executes command at the remote_host, or, if no command is specified, logs into remote_host.
OPTIONS
Turns on socket debugging (using setsockopt()) on the TCP sockets used for communication with the remote host. Specifies that rsh is to
log into the remote host as user instead of the local username. If this option is not specified, the local and remote usernames are the
same. Specifies that rsh is to ignore input from STDIN. Use this option if you put rsh in the background without redirecting its input
away from the terminal. If you do not use this option in this situation, rsh blocks even if no reads are posted by the remote command.
DESCRIPTION
The rsh command sends standard input from the local host to the remote command and receives standard output and standard error from the
remote command. If you do not specify a command, rsh executes rlogin instead.
If you do not specify the -l option, the local username is used at the remote host. If -l user is entered, the specified username is used
at the remote host. In either case, the remote host allows access only if at least one of the following conditions is satisfied: The local
user ID is not superuser, and the name of the local host is listed as an equivalent host in the remote /etc/hosts.equiv file. If either
the local user ID is superuser or the check of /etc/hosts.equiv fails, the remote user's home directory must contain a $HOME/.rhosts file
that lists the local host and username.
For security reasons, any $HOME/.rhosts file must be owned by either the remote user or the root user, and should have permissions set to
600 (read and write by owner only).
In addition to the preceding conditions, rsh also allows access to the remote host if the remote user account does not have a password
defined. However, for security reasons, use of a password on all user accounts is recommended.
While the remote command is executing, pressing the Interrupt, Terminate, or Quit key sequences sends the corresponding signal to the
remote process. However, pressing the Stop key sequence stops only the local process. Normally, when the remote command terminates, the
local rsh process terminates.
To have shell metacharacters interpreted on the remote host, place the metacharacters inside (double quotes). Otherwise, the metacharac-
ters are interpreted by the local shell.
RESTRICTIONS
The rsh command is confused by output generated by commands in a file on the remote host. In particular, the messages, where are you? and
stty: Can't assign requested address can result if output is generated by the startup file.
EXAMPLES
In the following examples, the local host host1 is listed in the /etc/hosts.equiv file at the remote host host2. To check the amount of
free disk space on the remote host host2, enter: $ rsh host2 df To append a remote file to another file on the remote host, place the >>
metacharacters in (double quotes): $ rsh host2 cat test1 ">>" test2 To append a remote file at the remote host to a local file, omit the
double quotes: $ rsh host2 cat test2 >> test3 To append a remote file to a local file and use a remote user's permissions at the remote
host, use the -l option: $ rsh host2 -l jane cat test4 >> test5
FILES
Specifies remote hosts from which users can execute commands on the local host (provided these users have an account on the local host).
Specifies remote users that can use a local user account.
SEE ALSO
Commands: rcp(1), rlogin(1), rshd(8), telnet(1)
Functions: rexec(3)
Files: rhosts(4)rsh(1)