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Add default DKIM selector, note about dynamic selectors, TXT example

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Corbin 2024-06-10 14:37:41 -04:00
parent ada63855c0
commit 58212611ba
2 changed files with 24 additions and 9 deletions
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28
README.md
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@ -1,8 +1,8 @@
# email_dns.py # email_dns.py
A simple Python script to resolve all email-related DNS records for a domain A Python script to resolve email-related DNS records for a domain.
Example Example:
``` ```
$ python email_dns.py cbarts.net $ python email_dns.py cbarts.net
@ -18,18 +18,32 @@ $ python email_dns.py cbarts.net
"preference": "20" "preference": "20"
} }
], ],
"spf": "v=spf1 include:_spf.protonmail.ch mx -all", "spf": "v=spf1 a include:spf.protection.outlook.com -all",
"dkim": [ "dkim": [
{ {
"type": "CNAME", "application": "not specified",
"value": "protonmail.domainkey.d54jb2xmwmmyjawzyztmko2lix3f4dz4uwu2rptmnailfrd6hqgeq.domains.proton.ch." "selector": "default",
"type": "TXT",
"value": "v=DKIM1; k=rsa; p=MIIBI...;"
}, },
{ {
"application": "exchange",
"selector": "selector1",
"type": "CNAME", "type": "CNAME",
"value": "protonmail2.domainkey.d54jb2xmwmmyjawzyztmko2lix3f4dz4uwu2rptmnailfrd6hqgeq.domains.proton.ch." "value": "selector1-contoso-com._domainkey.contoso.onmicrosoft.com."
},
{
"application": "exchange",
"selector": "selector2",
"type": "CNAME",
"value": "selector2-contoso-com._domainkey.contoso.onmicrosoft.com."
} }
], ],
"dmarc": "v=DMARC1; p=quarantine; rua=mailto:admin@cbarts.net,mailto:86be0037@mxtoolbox.dmarc-report.com; ruf=mailto:admin@cbarts.net,mailto:86be0037@forensics.dmarc-report.com" "dmarc": "v=DMARC1; p=quarantine; adkim=s; aspf=s; fo=1; ri=3600;"
} }
} }
``` ```
## Limitations
Applications with *dynamic* selector names will not be detected, e.g. smtp2go (`s12345._domainkey.<domain>`)

5
email_dns.py
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@ -6,8 +6,9 @@ import re
import json import json
dkim_selectors = { # <selector>._domainkey.<domain> dkim_selectors = { # <selector>._domainkey.<domain>
'none': [ # Applications with dynamic selector names will not be detected, e.g. smtp2go (s12345._domainkey.<domain>)
'dkim' 'not specified': [
'dkim', 'default'
], ],
'google': [ 'google': [
'google' 'google'