Question

我有（com）区域的DNS服务器。我在Ubuntu中使用BIND 9.10.3。我想使用DNSSEC对此服务器进行DNS查询。我创建了ZSK和KSK，并且我有一个名为forward.com.signed的签名区域文件。

forward.com.signed文件内容如下：（注意：我将签名剪切为一行长度以使帖子缩短）：

; File written on Thu May 24 02:13:50 2018
; dnssec_signzone version 9.10.3-P4-Ubuntu
com.            604800  IN SOA  dns1.com. admin.com. (
                    33         ; serial
                    604820     ; refresh (1 week 20 seconds)
                    86600      ; retry (1 day 3 minutes 20 seconds)
                    2419600    ; expire (4 weeks 6 minutes 40 seconds)
                    604600     ; minimum (6 days 23 hours 56 minutes 40 seconds)
                    )
            604800  RRSIG   SOA 7 1 604800 (
                    20180623001350 20180524001350 12410 com.
                    Qfd9i1AndX/dmyQuksOo2CRXH5RyM7i52c3P
                    )
            604800  NS  dns1.com.
            604800  RRSIG   NS 7 1 604800 (
                    20180623001350 20180524001350 12410 com.
                    Qj1DMmEhfkU5KI9MVrIlgKmQ5DxTjGuRNJ8i
                    )
            604800  DNSKEY  256 3 7 (
                    AwEAAfZWrsuiFoAAGcOTDWyVlDoZjQC8CZc6
                    ) ; ZSK; alg = NSEC3RSASHA1; key id = 12410
            604800  DNSKEY  257 3 7 (
                    AwEAAbc92MYUBPIs1L6lNAbubqRmZCfgv1h7
                    ) ; KSK; alg = NSEC3RSASHA1; key id = 62649
            604800  RRSIG   DNSKEY 7 1 604800 (
                    20180623001350 20180524001350 12410 com.
                    MuNVIE6oWV03+dXnXu+VufPQqfIgQvNIBODh
                    )
            604800  RRSIG   DNSKEY 7 1 604800 (
                    20180623001350 20180524001350 62649 com.
                    HxKx8nsyZ/qtrAvhsFJ9r7EBBwhSCGh0FJfM
                    )
            0   NSEC3PARAM 1 0 10 1C5A91FD094B6845
            0   RRSIG   NSEC3PARAM 7 1 0 (
                    20180623001350 20180524001350 12410 com.
                    qXpHn0q2GG/BK71mMYqCELsoHiFT6Oel82Jv
                    )
dns1.com.       604800  IN A    192.168.56.3
            604800  RRSIG   A 7 2 604800 (
                    20180623001350 20180524001350 12410 com.
                    aHB7ZCD8dDV4jMHJsUg23jjcm48tTnUvS8hy
                    wYPPhwqjjYr/holMmg== )
a.com.      604800  IN A    192.168.56.7
            604800  RRSIG   A 7 2 604800 (
                    20180623001350 20180524001350 12410 com.
                    0V7mUWUOuru41Rkp+RFp6eV13AHOdPnEanrV
                    )
            604800  TXT "some-random-text"
            604800  RRSIG   TXT 7 2 604800 (
                    20180623001350 20180524001350 12410 com.
                    Uta2/oGszVJAhm/DlGd7vnD+irg/GzyXlKHp
                    )
b.com.      604800  IN A    192.168.56.8
            604800  RRSIG   A 7 2 604800 (
                    20180623001350 20180524001350 12410 com.
                    2ui9x3SjrrEvFkcPbfcfC/NQW0MQOv2jy/Bd
                    )
            604800  TXT ""
            604800  RRSIG   TXT 7 2 604800 (
                    20180623001350 20180524001350 12410 com.
                    etX8lM00XXK9hUMM4FVsc51zuYOCz2+6qNLM
                    )
8NRLOA7UP8TGKLFJ7A6KPTIS503NJ4NB.com. 604600 IN NSEC3 1 1 10 1C5A91FD094B6845 (
                    QNU3FGJ5VOCSBIP3N93ITKLM4OP6GMCO
                    A TXT RRSIG )
            604600  RRSIG   NSEC3 7 2 604600 (
                    20180623001350 20180524001350 12410 com.
                    0qFfv4wr6WYSb4JlrtOlmPWykmCUKNdADlH8
                    )
QNU3FGJ5VOCSBIP3N93ITKLM4OP6GMCO.com. 604600 IN NSEC3 1 1 10 1C5A91FD094B6845 (
                    TVQJ9TFT4DPK7IGFE32TKLFG6EH2CUH5
                    A RRSIG )
            604600  RRSIG   NSEC3 7 2 604600 (
                    20180623001350 20180524001350 12410 com.
                    qZCi11tgJWJwjK2NI9KTVkcaJ0Eln0NVDsjM
                    )
TVQJ9TFT4DPK7IGFE32TKLFG6EH2CUH5.com. 604600 IN NSEC3 1 1 10 1C5A91FD094B6845 (
                    0J67JF0QNUUEKT5VF6FQPCRR9T8I8RT7
                    NS SOA RRSIG DNSKEY NSEC3PARAM )
            604600  RRSIG   NSEC3 7 2 604600 (
                    20180623001350 20180524001350 12410 com.
                    gud9iAHIRi4vR6eCgwOe6Xz0fR5F1qksJz6x
                    )
0J67JF0QNUUEKT5VF6FQPCRR9T8I8RT7.com. 604600 IN NSEC3 1 1 10 1C5A91FD094B6845 (
                    8NRLOA7UP8TGKLFJ7A6KPTIS503NJ4NB
                    A TXT RRSIG )
            604600  RRSIG   NSEC3 7 2 604600 (
                    20180623001350 20180524001350 12410 com.
                    8ZowNBjQXgaAx89kjTmgCu/9lYLk14L+xTWr
                    )

我使用dnspython库使用以下客户端python脚本：

import dns.name
import dns.query
import dns.dnssec
import dns.message
import dns.resolver
import dns.rdatatype

# get nameservers for target domain
response = dns.resolver.query('com.',dns.rdatatype.NS)

# we'll use the first nameserver in this example
nsname = response.rrset[0] # name
response = dns.resolver.query(nsname,dns.rdatatype.A)

print("DONE")

但我收到了这个错误：

Traceback (most recent call last):
  File "test-3-dnssec.py", line 13, in <module>
    response = dns.resolver.query(nsname,dns.rdatatype.A)
  File "C:\Python36\lib\site-packages\dns\resolver.py", line 1132, in query
    raise_on_no_answer, source_port)
  File "C:\Python36\lib\site-packages\dns\resolver.py", line 907, in query
    if qname.is_absolute():
AttributeError: 'NS' object has no attribute 'is_absolute'

客户的完整代码来自此答案here：

import dns.name
import dns.query
import dns.dnssec
import dns.message
import dns.resolver
import dns.rdatatype

# get nameservers for target domain
response = dns.resolver.query('example.com.',dns.rdatatype.NS)

# we'll use the first nameserver in this example
nsname = response.rrset[0] # name
response = dns.resolver.query(nsname,dns.rdatatype.A)
nsaddr = response.rrset[0].to_text() # IPv4

# get DNSKEY for zone
request = dns.message.make_query('example.com.',
                                 dns.rdatatype.DNSKEY,
                                 want_dnssec=True)

# send the query
response = dns.query.udp(request,nsaddr)
if response.rcode() != 0:
    # HANDLE QUERY FAILED (SERVER ERROR OR NO DNSKEY RECORD)

# answer should contain two RRSET: DNSKEY and RRSIG(DNSKEY)
answer = response.answer
if len(answer) != 2:
    # SOMETHING WENT WRONG

# the DNSKEY should be self signed, validate it
name = dns.name.from_text('example.com.')
try:
    dns.dnssec.validate(answer[0],answer[1],{name:answer[0]})
except dns.dnssec.ValidationFailure:
    # BE SUSPICIOUS
else:
    # WE'RE GOOD, THERE'S A VALID DNSSEC SELF-SIGNED KEY FOR example.com

我无法确定问题所在。你能帮帮我吗？

Answer 1

dns.resolver.query() API为query(qname, rdtype=1, rdclass=1, tcp=False, source=None, raise_on_no_answer=True, source_port=0)且qname必须为ns.name.Name对象或字符串，每http://www.dnspython.org/docs/1.15.0/dns.resolver-module.html#query

您正在为它提供2个参数，第一个参数基于它的创建方式，类型为dns.rdtypes.ANY.NS.NS，因此与API不匹配。

如果你改为：

response = dns.resolver.query(str(nsname), rdtype=dns.rdatatype.A)

然后它起作用（rdtype=并非严格必要，但更清晰。）

In [1]: response = dns.resolver.query('com.',dns.rdatatype.NS)

In [2]: nsname = response.rrset[0]

In [3]: response = dns.resolver.query(str(nsname), rdtype=dns.rdatatype.A)

In [4]: print response
<dns.resolver.Answer object at 0x103c22090>

In [5]: print response.rrset[0].to_text()
192.42.93.30

DNSSEC使用dnspython错误：AttributeError：＆＃39; NS＆＃39;对象没有属性＆＃39; is_absolute＆＃39;

1 个答案: