109 lines
2.7 KiB
Go
109 lines
2.7 KiB
Go
// Copyright (c) 2026 Probo Inc <hello@probo.com>.
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice appear in all copies.
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//
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// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
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// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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// AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
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// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
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// OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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// PERFORMANCE OF THIS SOFTWARE.
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package security
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import (
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"context"
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"fmt"
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"strings"
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"codeberg.org/miekg/dns"
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"go.probo.inc/probo/pkg/agent"
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)
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type (
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dnssecParams struct {
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Domain string `json:"domain" jsonschema:"The domain to check DNSSEC for (e.g. example.com)"`
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}
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dnssecResult struct {
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Enabled bool `json:"enabled"`
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HasDNSKEY bool `json:"has_dnskey"`
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KeyCount int `json:"key_count,omitempty"`
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Details string `json:"details,omitempty"`
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ErrorDetail string `json:"error_detail,omitempty"`
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}
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)
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func CheckDNSSECTool() agent.Tool {
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return agent.FunctionTool(
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"check_dnssec",
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"Check if DNSSEC is enabled for a domain by looking up DNSKEY records.",
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func(ctx context.Context, p dnssecParams) (agent.ToolResult, error) {
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fqdn := p.Domain
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if !strings.HasSuffix(fqdn, ".") {
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fqdn = fqdn + "."
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}
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client := dns.NewClient()
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answers, err := queryDNS(
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ctx,
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client,
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&dns.DNSKEY{
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Hdr: dns.Header{
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Name: fqdn,
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Class: dns.ClassINET,
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},
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},
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withDNSSEC(),
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)
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if err != nil {
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return agent.ResultJSON(
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dnssecResult{
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Enabled: false,
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ErrorDetail: fmt.Sprintf("cannot query DNSKEY records: %s", err),
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},
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), nil
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}
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var (
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keyCount int
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keyDetails []string
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)
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for _, answer := range answers {
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if key, ok := answer.(*dns.DNSKEY); ok {
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keyCount++
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flags := "ZSK"
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// SEP (Secure Entry Point) flag is bit 15 (value 1)
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if key.Flags&0x0001 != 0 {
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flags = "KSK"
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}
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keyDetails = append(
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keyDetails,
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fmt.Sprintf("%s (algorithm=%d, flags=%d)", flags, key.Algorithm, key.Flags),
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)
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}
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}
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hasDNSKEY := keyCount > 0
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result := dnssecResult{
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Enabled: hasDNSKEY,
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HasDNSKEY: hasDNSKEY,
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KeyCount: keyCount,
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Details: strings.Join(keyDetails, "; "),
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}
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if !hasDNSKEY {
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result.Details = "no DNSKEY records found"
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}
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return agent.ResultJSON(result), nil
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},
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)
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}
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