Thank you, -d surfaced the issue - now to decide what to do about it...
________________________________
From: bind-users <
bind-users-bounces@lists.isc.org> on behalf of Kevin Darcy <
kevin.darcy@fcagroup.com>
Sent: Tuesday, August 4, 2020 3:28 PM
To:
bind-users@lists.isc.org <
bind-users@lists.isc.org>
Subject: [EXTERNAL] Re: CNAME restrictions
CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe.
[ Classification Level: GENERAL BUSINESS ]
Offhand, it looks like the server side is configured to only allow authenticated updates, but you're sending an unauthenticated one.
A more nuanced issue might be if the ID you're running the nsupdate as, can't read the key files, so even though you may have intended the update to be signed, it actually wasn't.
Did you try adding a -d to the nsupdate command? If so, does the debug output give any clues?
- Kevin
On Tue, Aug 4, 2020 at 1:30 PM Leroy Tennison <
leroy@datavoiceint.com<mailto:
leroy@datavoiceint.com>> wrote:
I have a situation where, due to the system's location (IP subnet), its DNS name is <webserver>.<internal subdomain>.datavoiceint.com<
https://linkprotect.cudasvc.com/url?a=http%3a%2f%2fdatavoiceint.com&c=E,1,0gSBGzOV_9iJ4F-vOfqNwsk4Kjf6AQvm_
Nt3gjCZAng77d3CYgiVYS_-yNeGK3M-LLCuD8B-erwPcTNMkAxJaTdxayw90W-cIVfFe6TBpYonsjiZafcGPSBGsgSS&typo=1>. We have a certificate for *.datavoiceint.com<
https://linkprotect.cudasvc.com/url?a=http%3a%2f%2fdatavoiceint.com&c=E,1,e3FlEDT18o4d4tQSRMvBH_pJRuK7156_
n6wtGIzdpwjQt88Y_j375seki-O4IjtqsVLmsYGablGT9qnLV7jap1khSDSeV8Qt3U6JQ73WAhGbMMeoi10k&typo=1> which we prefer to use instead of having to acquire a certificate for <internal subdomain>.datavoiceint.com<
https://linkprotect.cudasvc.com/url?a=http%3a%2f%
2fdatavoiceint.com&c=E,1,6-PPelQOIFl5wSdbP2RNe2N6pkrhqneq6Ezfx3p5-pXYgNrt6J521WJEJJKFmvxtsjfuSzRbWHJnSbpTUyu6XqeAeCg6OO0-KzDJiXfe1ccW7qg9pN7g2CgI&typo=1> since this is a one-off internal-only web server. Our (ISC) DNS servers (version 9.10.3-P4-Ubuntu
that comes with Ubuntu 16.04) serve both domains. I thought a solution would be to use a CNAME but, when I attempt this (via nsupdate with the update key which works for A and PTR adds and deletes) I get (on "send"):
TSIG error with server: expected a TSIG or SIG(0)
update failed: NOTIMP
What I tried (on both <internal subdomain>.datavoiceint.com<
https://linkprotect.cudasvc.com/url?a=http%3a%2f%2fdatavoiceint.com&c=E,1,WqKTpCcatx2SaWvqy4SyBLF0mNa1-gW8LKH80Ec2eWBinE3E7c5lEHLpjRuSiRnF_xc32FO_Ke1HOfMD3_RKS1c_-Gb4quMBWrNQrHh74wi-HJkg&typo=1>.
and datavoiceint.com<
https://linkprotect.cudasvc.com/url?a=http%3a%2f%2fdatavoiceint.com&c=E,1,gDRbc9b7Hocp2adLEqMg2H4aBk9B80nSlj9DRUkwds45t2gqX4OYSPpS7T0rTc7SpPNhIUwv5Qxh01PYiNrEy5_9cB7--c16EqfcCxXOM4w,&typo=1>.) was:
update add <webserver>.datavoiceint.com<
https://linkprotect.cudasvc.com/url?a=http%3a%2f%2fdatavoiceint.com&c=E,1,LMSRr0xOj2dbcOJlyj5U8VIFyRH5ecttdkU4Je538OMUPmbLfqBLc5uT1bH4P4-AQWj7eME7APcmrfzjgPYOORSQ1gGlo41FqXQQU67iTV6fGo1tYi-G3-c,&typo=1>. 86400 IN
CNAME <webserver>.<internal subdomain>.datavoiceint.com<
https://linkprotect.cudasvc.com/url?a=http%3a%2f%2fdatavoiceint.com&c=E,1,K69ghu-8VkYZl4XrnMCfdzlp4UUfK2BGmh9Q9xWS3VzeXkVGOtpJequZa-J_gQCYM2J904MVlyeH5VboQjCatM-y6QbI5FtcIV32w9Cx&typo=1>.
Apparently I'm mis-understanding CNAME usage, if I actually can use a CNAME record what should the format be (or do I need to configure bind differently to use it since part of the reply is NOTIMP)? If that's not possible due to CNAME restrictions are
there any alternatives?
Thanks for your help.
Harriscomputer
Leroy Tennison
Network Information/Cyber Security Specialist
E:
leroy@datavoiceint.com<mailto:
leroy@datavoiceint.com>
P:
[cid:Data-Voice-International-LOGO_aa3d1c6e-5cfb-451f-ba2c-af8059e69609.PNG]
2220 Bush Dr
McKinney, Texas
75070
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Harriscomputer
Leroy Tennison
Network Information/Cyber Security Specialist
E:
leroy@datavoiceint.com
P:
[cid:Data-Voice-International-LOGO_aa3d1c6e-5cfb-451f-ba2c-af8059e69609.PNG]
2220 Bush Dr
McKinney, Texas
75070
www.datavoiceint.com<
http://www..com>
This message has been sent on behalf of a company that is part of the Harris Operating Group of Constellation Software Inc.
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<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Thank you, -d surfaced the issue - now to decide what to do about it...</div> <div>
<div id="appendonsend"></div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> bind-users <
bind-users-bounces@lists.isc.org> on behalf of Kevin Darcy <
kevin.darcy@fcagroup.com><br>
<b>Sent:</b> Tuesday, August 4, 2020 3:28 PM<br>
<b>To:</b>
bind-users@lists.isc.org <
bind-users@lists.isc.org><br> <b>Subject:</b> [EXTERNAL] Re: CNAME restrictions</font>
<div> </div>
</div>
<div>
<p></p>
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<span style="color:#9C6500">CAUTION:</span> This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe.</div>
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<div dir="ltr">
<div>[ Classification Level: <font color="blue">GENERAL BUSINESS</font> ]</div> <br class="x_cursAfter">
Offhand, it looks like the server side is configured to only allow authenticated updates, but you're sending an unauthenticated one.
<div><br>
</div>
<div>A more nuanced issue might be if the ID you're running the nsupdate as, can't read the key files, so even though you may have intended the update to be signed, it actually wasn't.</div>
<div><br>
</div>
<div>Did you try adding a -d to the nsupdate command? If so, does the debug output give any clues?</div>
<div><br>
</div>
<div> &
nbsp; - Kevin</div>
<div><br>
<div class="x_gmail_quote">
<div dir="ltr" class="x_gmail_attr">On Tue, Aug 4, 2020 at 1:30 PM Leroy Tennison <<a href="mailto:
leroy@datavoiceint.com">
leroy@datavoiceint.com</a>> wrote:<br>
</div>
<blockquote class="x_gmail_quote" style="margin:0 0 0 .8ex; border-left:1px #ccc solid; padding-left:1ex">
<div dir="ltr">
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
<span style="color:rgb(0,0,0); font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt">I have a situation where, due to the system's location (IP subnet), its DNS name is <webserver>.<internal subdomain>.<a href="
https://linkprotect.
cudasvc.com/url?a=http%3a%2f%2fdatavoiceint.com&c=E,1,0gSBGzOV_9iJ4F-vOfqNwsk4Kjf6AQvm_Nt3gjCZAng77d3CYgiVYS_-yNeGK3M-LLCuD8B-erwPcTNMkAxJaTdxayw90W-cIVfFe6TBpYonsjiZafcGPSBGsgSS&typo=1" target="_blank">datavoiceint.com</a>.
We have a certificate for *.<a href="
https://linkprotect.cudasvc.com/url?a=http%3a%2f%2fdatavoiceint.com&c=E,1,e3FlEDT18o4d4tQSRMvBH_pJRuK7156_n6wtGIzdpwjQt88Y_j375seki-O4IjtqsVLmsYGablGT9qnLV7jap1khSDSeV8Qt3U6JQ73WAhGbMMeoi10k&typo=1" target="_
blank">datavoiceint.com</a>
which </span><span style="color:rgb(0,0,0); font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt">we prefer to use instead of having to acquire a certificate for <internal subdomain>.<a href="
https://linkprotect.cudasvc.com/url?a=
http%3a%2f%2fdatavoiceint.com&c=E,1,6-PPelQOIFl5wSdbP2RNe2N6pkrhqneq6Ezfx3p5-pXYgNrt6J521WJEJJKFmvxtsjfuSzRbWHJnSbpTUyu6XqeAeCg6OO0-KzDJiXfe1ccW7qg9pN7g2CgI&typo=1" target="_blank">datavoiceint.com</a>
since this is a one-off internal-only web server. Our (ISC) DNS servers (version 9.10.3-P4-Ubuntu that comes with Ubuntu 16.04) serve both domains. I thought a solution would be to use a CNAME but, when I attempt this (via nsupdate with the
update key which
works for A and PTR adds and deletes) I get (on "send"):</span><br> </div>
<div>
<div dir="ltr">
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
<span style="font-family:Calibri,Arial,Helvetica,sans-serif; background-color:rgb(255,255,255); display:inline!important"><br>
</span></div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
<span style="font-family:Calibri,Arial,Helvetica,sans-serif; background-color:rgb(255,255,255); display:inline!important"> TSIG error with server: expected a TSIG or SIG(0)</span></div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
<span style="font-family:Calibri,Arial,Helvetica,sans-serif; background-color:rgb(255,255,255); display:inline!important">update failed: NOTIMP<br>
</span></div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
<span style="font-family:Calibri,Arial,Helvetica,sans-serif; background-color:rgb(255,255,255); display:inline!important"><br>
</span></div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
<span style="font-family:Calibri,Arial,Helvetica,sans-serif; background-color:rgb(255,255,255); display:inline!important">What I tried (on both <internal subdomain>.<a href="
https://linkprotect.cudasvc.com/url?a=http%3a%2f%2fdatavoiceint.com&c=
E,1,WqKTpCcatx2SaWvqy4SyBLF0mNa1-gW8LKH80Ec2eWBinE3E7c5lEHLpjRuSiRnF_xc32FO_Ke1HOfMD3_RKS1c_-Gb4quMBWrNQrHh74wi-HJkg&typo=1" target="_blank">datavoiceint.com</a>.
and <a href="
https://linkprotect.cudasvc.com/url?a=http%3a%2f%2fdatavoiceint.com&c=E,1,gDRbc9b7Hocp2adLEqMg2H4aBk9B80nSlj9DRUkwds45t2gqX4OYSPpS7T0rTc7SpPNhIUwv5Qxh01PYiNrEy5_9cB7--c16EqfcCxXOM4w,&typo=1" target="_blank">datavoiceint.com</a>.
) was:</span></div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
<span style="font-family:Calibri,Arial,Helvetica,sans-serif; background-color:rgb(255,255,255); display:inline!important"><br>
</span></div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
<span style="font-family:Calibri,Arial,Helvetica,sans-serif; background-color:rgb(255,255,255); display:inline!important">update add <<span style="font-family:Calibri,Arial,Helvetica,sans-serif; background-color:rgb(255,255,255); display:inline!
important">webserver></span>.<a href="
https://linkprotect.cudasvc.com/url?a=http%3a%2f%2fdatavoiceint.com&c=E,1,LMSRr0xOj2dbcOJlyj5U8VIFyRH5ecttdkU4Je538OMUPmbLfqBLc5uT1bH4P4-AQWj7eME7APcmrfzjgPYOORSQ1gGlo41FqXQQU67iTV6fGo1tYi-G3-c,&typo=1"
target="_blank">datavoiceint.com</a>.
86400 IN CNAME <span style="font-family:Calibri,Arial,Helvetica,sans-serif; background-color:rgb(255,255,255); display:inline!important"><webserver>.<internal subdomain></span>.<a href="
https://linkprotect.cudasvc.com/url?a=http%3a%2f%
2fdatavoiceint.com&c=E,1,K69ghu-8VkYZl4XrnMCfdzlp4UUfK2BGmh9Q9xWS3VzeXkVGOtpJequZa-J_gQCYM2J904MVlyeH5VboQjCatM-y6QbI5FtcIV32w9Cx&typo=1" target="_blank">datavoiceint.com</a>.<br>
</span></div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
<span style="font-family:Calibri,Arial,Helvetica,sans-serif; background-color:rgb(255,255,255); display:inline!important"><br>
</span></div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
<span style="font-family:Calibri,Arial,Helvetica,sans-serif; background-color:rgb(255,255,255); display:inline!important">Apparently I'm mis-understanding CNAME usage, if I actually can use a CNAME record what should the format be (or do I need to
configure
bind differently to use it since part of the reply is NOTIMP)? If that's not possible due to CNAME restrictions are there any alternatives?</span></div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
<span style="font-family:Calibri,Arial,Helvetica,sans-serif; background-color:rgb(255,255,255); display:inline!important"><br>
</span></div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
<span style="font-family:Calibri,Arial,Helvetica,sans-serif; background-color:rgb(255,255,255); display:inline!important">Thanks for your help.</span></div>
</div>
</div>
<p id="x_m_-6032679741644376038c1-id-7" style="font-size:0px; font-family:Arial; color:#fff">
Harriscomputer</p>
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<p align="left" style="font-size:10pt; font-family:Arial"><b id="x_m_-6032679741644376038c1-id-30"><font id="x_m_-6032679741644376038c1-id-31" face="Arial">Leroy Tennison<br id="x_m_-6032679741644376038c1-id-32">
</font></b><font id="x_m_-6032679741644376038c1-id-33" size="2" face="Arial">Network Information/Cyber Security Specialist<br id="x_m_-6032679741644376038c1-id-38">
<span id="x_m_-6032679741644376038c1-id-39" style="font-size:8pt">E: <a href="mailto:
leroy@datavoiceint.com" target="_blank">
leroy@datavoiceint.com</a><br>
P:</span></font></p>
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<img border="0" data-outlook-trace="F:0|T:1" src="cid:Data-Voice-International-LOGO_aa3d1c6e-5cfb-451f-ba2c-af8059e69609.PNG"></p>
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<font id="x_m_-6032679741644376038c1-id-47" face="Arial" style="font-size:8pt">2220 Bush Dr<br id="x_m_-6032679741644376038c1-id-48">
McKinney, Texas<br id="x_m_-6032679741644376038c1-id-49">
75070<br>
<font id="x_m_-6032679741644376038c1-id-51" face="Arial" style="font-size:8pt"><a href="
http://www..com" target="_blank">www.datavoiceint.com</a></font></font><font id="x_m_-6032679741644376038c1-id-56" size="3"> </font></p>
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_______________________________________________<br>
Please visit <a href="
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<P id=c1-id-7
style="FONT-SIZE: 0px; FONT-FAMILY: Arial; COLOR: #fff">Harriscomputer</P> <TABLE id=c1-id-8
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<COLGROUP id=c1-id-15>
<COL id=c1-id-16>
<COL id=c1-id-17>
<COL id=c1-id-18></COL></COL></COL></COLGROUP>
<TBODY id=c1-id-19>
<TR id=c1-id-27>
<TD id=c1-id-28 style="WIDTH: 33%">
<P style="FONT-SIZE: 10pt; FONT-FAMILY: Arial" align=left><B
id=c1-id-30><FONT id=c1-id-31 face=Arial>Leroy Tennison<BR
id=c1-id-32></FONT></B><FONT id=c1-id-33 size=2
face=Arial>Network Information/Cyber Security Specialist<BR id=c1-id-38><SPAN id=c1-id-39
style="FONT-SIZE: 8pt">E:
leroy@datavoiceint.com<BR>P:</SPAN></FONT></P></TD>
<TD id=c1-id-40 style="WIDTH: 33%">
<P style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; TEXT-ALIGN: center"
align=center><BR id=c1-id-43><IMG border=0
src="cid:Data-Voice-International-LOGO_aa3d1c6e-5cfb-451f-ba2c-af8059e69609.PNG"></P></TD>
<TD id=c1-id-45 style="WIDTH: 33%">
<P id=c1-id-46
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial; TEXT-ALIGN: right"
align=right><FONT id=c1-id-47 style="FONT-SIZE: 8pt"
face=Arial>2220 Bush Dr<BR id=c1-id-48>McKinney, Texas<BR
id=c1-id-49>75070<BR><FONT id=c1-id-51
style="FONT-SIZE: 8pt" face=Arial><A
href="
http://www..com">www.datavoiceint.com</A></FONT></FONT><FONT
id=c1-id-56 size=3> </FONT></P></TD></TR></TBODY></TABLE>
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<P id=c1-id-65
style="MARGIN-BOTTOM: 0px; FONT-SIZE: 10pt; FONT-FAMILY: Arial; MARGIN-TOP: 0px"><FONT
id=c1-id-66 size=1 face=Arial>This message has been sent on behalf
of a company that is part of the Harris Operating Group of
Constellation Software Inc.</FONT></P>
<P
style="MARGIN-BOTTOM: 0px; FONT-SIZE: 10pt; FONT-FAMILY: Arial; MARGIN-TOP: 0px"><FONT
size=1 face=Arial>If you prefer not to be contacted by Harris
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size=1 face=Arial></FONT></P>
<P
style="MARGIN-BOTTOM: 0px; FONT-SIZE: 10pt; FONT-FAMILY: Arial; MARGIN-TOP: 0px"><FONT
size=1 face=Arial>This message is intended exclusively for the
individual or entity to which it is addressed. This communication
may contain information that is proprietary, privileged or
confidential or otherwise legally exempt from disclosure. If you are
not the named addressee, you are not authorized to read, print,
retain, copy or disseminate this message or any part of it. If you
have received this message in error, please notify the sender
immediately by e-mail and delete all copies of the
message.</FONT></P></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE>
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