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mukul975 27c6414ca5 Add folder anatomy (scripts/agent.py + references/api-reference.md) for 648 cybersecurity skills

Complete skill folder anatomy across all cybersecurity skills:
- scripts/agent.py: 80-150 line Python agents using real libraries (impacket,
  boto3, azure-mgmt-*, kubernetes, pefile, yara, scapy, shodan, stix2, etc.)
- references/api-reference.md: real API documentation with method signatures
- LICENSE: MIT license for all skill folders

2026-03-10 21:02:12 +01:00

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API Reference: Email Security (SPF/DKIM/DMARC)

dnspython TXT Query

import dns.resolver
answers = dns.resolver.resolve("example.com", "TXT")
for rdata in answers:
    txt = b"".join(rdata.strings).decode("utf-8")

SPF Record Format

v=spf1 [mechanisms] [qualifier]all

Mechanism	Example	Description
`include:`	`include:_spf.google.com`	Include other SPF record
`ip4:`	`ip4:203.0.113.0/24`	Allow IPv4 range
`ip6:`	`ip6:2001:db8::/32`	Allow IPv6 range
`a:`	`a:mail.example.com`	Allow A record IP
`mx:`	`mx:example.com`	Allow MX record IPs
`redirect=`	`redirect=_spf.example.com`	Redirect to another SPF

Qualifier	Meaning	Effect
`-all`	Fail	Reject unauthorized senders
`~all`	Softfail	Accept but mark
`?all`	Neutral	No policy
`+all`	Pass	Allow all (insecure)

Limit: Max 10 DNS lookups (includes, a, mx, ptr, exists, redirect).

DKIM Record Query

{selector}._domainkey.{domain} TXT

v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEB...

Tag	Description
`v`	Version (DKIM1)
`k`	Key type (rsa, ed25519)
`p`	Public key (Base64)
`t`	Flags (y=testing, s=strict)

Common selectors: google, default, selector1, selector2, k1, mail, dkim, s1, s2, mandrill, smtpapi

DMARC Record Query

_dmarc.{domain} TXT

v=DMARC1; p=reject; rua=mailto:dmarc@example.com; pct=100

Tag	Values	Description
`p`	none/quarantine/reject	Policy for domain
`sp`	none/quarantine/reject	Subdomain policy
`pct`	0-100	Percentage of messages to apply policy
`rua`	mailto:URI	Aggregate report destination
`ruf`	mailto:URI	Forensic report destination
`adkim`	r/s	DKIM alignment (relaxed/strict)
`aspf`	r/s	SPF alignment (relaxed/strict)

Risk Scoring

Condition	Score
No SPF record	+40 critical
SPF +all	+40 critical
SPF ~all	+10 medium
No DKIM	+25 high
No DMARC	+40 critical
DMARC p=none	+25 high
DMARC pct < 100	+10 medium

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