server.py 文件源码

def get_user_auth_keys (self, username):
        """Parse the users's authorized_keys file if any to look for authorized keys"""
        if username in self.users_keys:
            return self.users_keys[username]

        self.users_keys[username] = []

        userdir = os.path.expanduser("~" + username)
        if not userdir:
            return self.users_keys[username]

        keyfile = os.path.join(userdir, ".ssh/authorized_keys")
        if not keyfile or not os.path.exists(keyfile):
            return self.users_keys[username]

        with open(keyfile) as f:
            for line in f.readlines():
                line = line.strip()
                if not line or line.startswith("#"):
                    continue
                values = [ x.strip() for x in line.split() ]

                exp = None
                try:
                    int(values[0])      # bits value?
                except ValueError:
                    # Type 1 or type 2, type 1 is bits in second value
                    options_ktype = values[0]
                    try:
                        int(values[1])  # bits value?
                    except ValueError:
                        # type 2 with options
                        ktype = options_ktype
                        data = values[1]
                    else:
                        # Type 1 no options.
                        exp = int(values[1])
                        data = values[2]
                else:
                    # Type 1 no options.
                    exp = int(values[1])
                    data = values[2]

                # XXX For now skip type 1 keys
                if exp is not None:
                    continue

                if data:
                    import base64
                    if ktype == "ssh-rsa":
                        key = ssh.RSAKey(data=base64.decodebytes(data.encode('ascii')))
                    elif ktype == "ssh-dss":
                        key = ssh.DSSKey(data=base64.decodebytes(data.encode('ascii')))
                    else:
                        key = None
                    if key:
                        self.users_keys[username].append(key)
        return self.users_keys[username]