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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1 +1,89 @@ | ||
| package bgpchecks | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "strings" | ||
|
|
||
| "github.com/5amu/dnshunter/pkg/output" | ||
| "github.com/5amu/dnshunter/pkg/utils" | ||
| "github.com/miekg/dns" | ||
| ) | ||
|
|
||
| type GEOCkeck struct { | ||
| description []string | ||
| client *dns.Client | ||
| output *output.CheckOutput | ||
| } | ||
|
|
||
| func (c *GEOCkeck) Init(client *dns.Client) error { | ||
| c.client = client | ||
| c.description = []string{ | ||
| "For, ASNs, one important thing to check is georedundancy", | ||
| "Always check the geographic zone in which an ASN is located.", | ||
| "This is important to guarantee availability.", | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func (c *GEOCkeck) Start(domain string, nameservers *utils.Nameservers) error { | ||
| c.output = &output.CheckOutput{ | ||
| Name: "BGP Georedundancy", | ||
| Domain: domain, | ||
| Nameservers: nameservers.FQDNs, | ||
| Description: c.description, | ||
| } | ||
|
|
||
| locations := map[string]int{} | ||
| for _, fqdn := range nameservers.FQDNs { | ||
| var res output.SingleCheckResult | ||
| res.Nameserver = fqdn | ||
| res.Zone = domain | ||
|
|
||
| asn, err := utils.NewASN(nameservers.GetIP(fqdn)) | ||
| if err != nil { | ||
| continue | ||
| } | ||
|
|
||
| nameSplitted := strings.Split(asn.Name, ",") | ||
| if len(nameSplitted) > 1 { | ||
| key := strings.ReplaceAll(nameSplitted[1], " ", "") | ||
| locations[key] += 1 | ||
| } | ||
| c.output.Results = append(c.output.Results, res) | ||
| } | ||
|
|
||
| var totalASN, totalGeo int | ||
| var countries []string | ||
| for k, v := range locations { | ||
| totalASN += v | ||
| totalGeo += 1 | ||
| countries = append(countries, k) | ||
| } | ||
|
|
||
| if totalASN < 2 { | ||
| for i := range c.output.Results { | ||
| c.output.Results[i].Vulnerable = true | ||
| c.output.Results[i].Information = append(c.output.Results[i].Information, "bad georedundancy: 1 location") | ||
| } | ||
| } | ||
|
|
||
| if totalASN/2 > totalGeo { | ||
| for i := range c.output.Results { | ||
| c.output.Results[i].Vulnerable = true | ||
| msg := "ideally, you should have every 1 or 2 ASNs in different countries" | ||
| c.output.Results[i].Information = append(c.output.Results[i].Information, msg) | ||
| } | ||
| } | ||
|
|
||
| for i := range c.output.Results { | ||
| msg := fmt.Sprintf("%d distrubuted over %d locations", totalASN, totalGeo) | ||
| c.output.Results[i].Information = append(c.output.Results[i].Information, msg) | ||
| msg = fmt.Sprintf("countries: %v", countries) | ||
| c.output.Results[i].Information = append(c.output.Results[i].Information, msg) | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func (c *GEOCkeck) Results() *output.CheckOutput { | ||
| return c.output | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,38 @@ | ||
| package utils | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "net" | ||
| "strings" | ||
|
|
||
| "github.com/5amu/dnshunter/pkg/defaults" | ||
| "github.com/likexian/whois" | ||
| ) | ||
|
|
||
| type ASN struct { | ||
| ID string | ||
| IP net.IP | ||
| Name string | ||
| } | ||
|
|
||
| func NewASN(nameserver net.IP) (*ASN, error) { | ||
| r, err := whois.Whois(nameserver.String(), defaults.DefaultWhoisServer) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| lines := strings.Split(r, "\n") | ||
| if len(lines) < 2 { | ||
| return nil, fmt.Errorf("no result found") | ||
| } | ||
|
|
||
| fields := strings.Split(strings.TrimSpace(lines[1]), "|") | ||
| if len(fields) != 3 { | ||
| return nil, fmt.Errorf("not enough fields") | ||
| } | ||
| return &ASN{ | ||
| ID: fields[0], | ||
| IP: net.ParseIP(strings.ReplaceAll(fields[1], " ", "")), | ||
| Name: fields[2], | ||
| }, nil | ||
| } |