source: fedd/fixed_key.py @ afa43a8

#!/usr/local/bin/python

# Encode the set of fixed keys as a colon-separated user/key pairs.  This also
# includes a command line utility to manipulate the DB.

def read_db(file):
    """
    Read the set of fixed keys fom the file
    """
    keys = set()

    f = open(file, "r")
    for line in f:
        u, k = line.rstrip().split(':', 2)
        keys.add((u, k))
    f.close()
    return keys

def write_db(file, keys):
    """
    Write the set of keys to the given file
    """

    f = open(file, 'w')
    for t in keys:
        print >>f, "%s:%s" % t
    f.close()

# This is the command line utility
if __name__ =='__main__':
    import sys
    import MySQLdb
    from optparse import OptionParser

    actions = set(("init", "add", "delete"))

    def read_key_file(file):
        """
        Read a single line from a keyfile and trim the whitespace
        """
        f = open(file, 'r')
        key = f.readline().rstrip()
        f.close()
        return key

    class key_opts(OptionParser):
        def __init__(self):
            OptionParser.__init__(self, usage="%prog (init|add|delete) " + \
                    "[opts] (--help for details)", version="0.1")
            self.add_option('-A', '--all-users', dest='all', default=False,
                    action='store_true', help='add all users to the database')
            self.add_option('-u','--user', dest='user', default=None,
                    action='store', help='user to add/delete')
            self.add_option('-k','--key', dest='key', default=None,
                    action='store', help='key to add/delete (string)')
            self.add_option('-K','--keyfile', dest='keyfile', default=None,
                    action='store', help='key to add/delete (file)')
            self.add_option('-d', '--database', dest='file', default=None,
                    action='store', help='database file')
            self.add_option('-f', '--file', dest='file', action='store',
                    help='database file (synonym for --database)')


    parser = key_opts()
    action = sys.argv[1]
    keys = set()

    # Check the action
    if action in actions: del sys.argv[1]
    else: sys.exit("Bad action, must be one of %s" % ", ".join(actions))

    # Parse the options
    (opts, args) = parser.parse_args()
    if not opts.file:
        sys.exit("Must specify DB file")

    # If we're initializing, clear the DB unless we're adding all from the 
    # Emulab DB
    if action == 'init':
        if not opts.all:
            write_db(opts.file, keys)
            sys.exit(0)
    else:
        keys = read_db(opts.file)

    if opts.all:
        if action == 'delete':
            sys.exit("delete and --all don't mix")
        # Add all users from the Emulab DB
        try:
            db = MySQLdb.connect(db="tbdb")
        except:
            sys.exit("Cannot access the Emulab database")

        c = db.cursor()
        c.execute("SELECT uid, pubkey from user_pubkeys")
        for u, k in c.fetchall():
            keys.add((u, k))
        c.close()
        db.close()
        write_db(opts.file, keys)
    else:
        # Add/delete a single user
        if opts.user: user = opts.user
        else: sys.exit("Must provide user (--user)")

        if opts.key:
            key = opts.key
        elif opts.keyfile: 
            try:
                key = read_key_file(opts.keyfile)
            except IOError, e:
                sys.exit("Error reading keyfile: %s" % e)
        else:
            sys.exit("Must provide key (--key or --keyfile)")
        
        if action == 'add':
            keys.add((user, key))
            write_db(opts.file, keys)
        elif action == 'delete':
            if (user, key) in keys:
                keys.remove((user, key))
                write_db(opts.file, keys)
            else:
                print >>sys.stderr, "Cannot delete (%s, %s) not in db" % \
                        (user, key)
        else:
            sys.exit("How did we get here??")
    sys.exit(0)