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Annotation of cci/usr/src/man/man8/rexecd.8c, revision 1.1

1.1     ! root        1: .TH REXECD 8C "4 March 1983"
        !             2: .UC 4
        !             3: .SH NAME
        !             4: rexecd \- remote execution server
        !             5: .SH SYNOPSIS
        !             6: .B /etc/rexecd
        !             7: .SH DESCRIPTION
        !             8: .I Rexecd
        !             9: is the server for the 
        !            10: .IR rexec (3X)
        !            11: routine.  The server provides remote execution facilities
        !            12: with authentication based on user names and encrypted
        !            13: passwords.
        !            14: .PP
        !            15: .I Rexecd
        !            16: listens for service requests at the port indicated in
        !            17: the ``exec'' service specification; see
        !            18: .IR services (5).
        !            19: When a service request is received the following protocol
        !            20: is initiated:
        !            21: .IP 1)
        !            22: The server reads characters from the socket up
        !            23: to a null (`\e0') byte.  The resultant string is
        !            24: interpreted as an ASCII number, base 10.
        !            25: .IP 2)
        !            26: If the number received in step 1 is non-zero,
        !            27: it is interpreted as the port number of a secondary
        !            28: stream to be used for the 
        !            29: .BR stderr .
        !            30: A second connection is then created to the specified
        !            31: port on the client's machine.
        !            32: .IP 3)
        !            33: A null terminated user name of at most 16 characters
        !            34: is retrieved on the initial socket.
        !            35: .IP 4)
        !            36: A null terminated, encrypted, password of at most
        !            37: 16 characters is retrieved on the initial socket.  
        !            38: .IP 5)
        !            39: A null terminated command to be passed to a
        !            40: shell is retrieved on the initial socket.  The length of
        !            41: the command is limited by the upper bound on the size of
        !            42: the system's argument list.  
        !            43: .IP 6)
        !            44: .I Rexecd
        !            45: then validates the user as is done at login time
        !            46: and, if the authentication was successful, changes
        !            47: to the user's home directory, and establishes the user
        !            48: and group protections of the user.
        !            49: If any of these steps fail the connection is
        !            50: aborted with a diagnostic message returned.
        !            51: .IP 7)
        !            52: A null byte is returned on the connection associated
        !            53: with the
        !            54: .B stderr 
        !            55: and the command line is passed to the normal login
        !            56: shell of the user.  The
        !            57: shell inherits the network connections established
        !            58: by
        !            59: .IR rexecd .
        !            60: .SH DIAGNOSTICS
        !            61: All diagnostic messages are returned on the connection
        !            62: associated with the
        !            63: .BR stderr ,
        !            64: after which any network connections are closed.
        !            65: An error is indicated by a leading byte with a value of
        !            66: 1 (0 is returned in step 7 above upon successful completion
        !            67: of all the steps prior to the command execution).
        !            68: .PP
        !            69: .B ``username too long''
        !            70: .br
        !            71: The name is
        !            72: longer than 16 characters.
        !            73: .PP
        !            74: .B ``password too long''
        !            75: .br
        !            76: The password is longer than 16 characters.
        !            77: .PP
        !            78: .B ``command too long ''
        !            79: .br
        !            80: The command line passed exceeds the size of the argument
        !            81: list (as configured into the system).
        !            82: .PP
        !            83: .B ``Login incorrect.''
        !            84: .br
        !            85: No password file entry for the user name existed.
        !            86: .PP
        !            87: .B ``Password incorrect.''
        !            88: .br
        !            89: The wrong was password supplied.
        !            90: .PP
        !            91: .B ``No remote directory.''
        !            92: .br
        !            93: The 
        !            94: .I chdir
        !            95: command to the home directory failed.
        !            96: .PP
        !            97: .B ``Try again.''
        !            98: .br
        !            99: A
        !           100: .I fork
        !           101: by the server failed.
        !           102: .PP
        !           103: .B ``/bin/sh: ...''
        !           104: .br
        !           105: The user's login shell could not be started.
        !           106: .SH BUGS
        !           107: Indicating ``Login incorrect'' as opposed to ``Password incorrect''
        !           108: is a security breach which allows people to probe a system for users
        !           109: with null passwords.
        !           110: .PP
        !           111: A facility to allow all data exchanges to be encrypted should be
        !           112: present.

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