{"action":"created","comment":{"url":"https://api.github.com/repos/letsencrypt/boulder/pulls/comments/61482976","id":61482976,"diff_hunk":"@@ -0,0 +1,250 @@\n+package cdr\n+\n+import (\n+\t\"crypto/sha256\"\n+\t\"encoding/json\"\n+\t\"errors\"\n+\t\"fmt\"\n+\t\"io/ioutil\"\n+\t\"net/http\"\n+\t\"net/url\"\n+\t\"sort\"\n+\t\"time\"\n+\n+\t\"github.com/miekg/dns\"\n+\t\"golang.org/x/net/context\"\n+\t\"golang.org/x/net/context/ctxhttp\"\n+\n+\tblog \"github.com/letsencrypt/boulder/log\"\n+\t\"github.com/letsencrypt/boulder/metrics\"\n+)\n+\n+// We have found a number of network operators which block or drop CAA\n+// queries that pass through their network which leads to consistent\n+// timeout failures from certain network perspectives. We have been\n+// unable to find a network solution to this so we are required to\n+// implement a multi-path resolution technique. This is a real hack and\n+// to be honest probably not the best solution to this problem. Ideally\n+// we would control our own distributed multi-path resolver but there\n+// are no publicly available ones.\n+//\n+// This implementation talks to the Google Public DNS resolver over\n+// multiple paths using HTTP proxies with geographically distributed\n+// endpoints. In case the Google resolver encounters the same issues we do\n+// multiple queries for the same name in parallel and we require a M of N\n+// quorum of responses to return the SUCCESS return code. In order to prevent\n+// the case where an attacker may be able to exploit the Google resolver in\n+// some way we also require that the records returned from all requests are\n+// the same (as far as I can tell the Google DNS implementation doesn't share\n+// cache state between the distributed nodes so this should be safe).\n+//\n+// Since DNS isn't a super secure protocol and Google has recently introduced\n+// a public HTTPS API for their DNS resolver so instead we use that.\n+//\n+// API reference:\n+//   https://developers.google.com/speed/public-dns/docs/dns-over-https#api_specification\n+\n+var apiURI = \"https://dns.google.com/resolve\"\n+\n+type question struct {\n+\tName string `json:\"name\"`\n+\tType uint16 `json:\"type\"`\n+}\n+\n+type answer struct {\n+\tName string `json:\"name\"`\n+\tType uint16 `json:\"type\"`\n+\tTTL  int    `json:\"TTL\"`\n+\tData string `json:\"data\"`\n+}\n+\n+type response struct {\n+\t// Ignored fields\n+\t//   tc\n+\t//   rd\n+\t//   ra\n+\t//   ad\n+\t//   cd\n+\t//   question\n+\t//   additional\n+\t//   edns_client_subnet\n+\tStatus  int      `json:\"Status\"`\n+\tAnswer  []answer `json:\"Answer\"`\n+\tComment string   `json:\"Comment\"`\n+}\n+\n+func parseAnswer(as []answer) ([]*dns.CAA, error) {\n+\trrs := []*dns.CAA{}\n+\t// only bother parsing out CAA records\n+\tfor _, a := range as {\n+\t\tif a.Type != dns.TypeCAA {\n+\t\t\tcontinue\n+\t\t}\n+\t\trr, err := dns.NewRR(fmt.Sprintf(\"%s %d IN CAA %s\", a.Name, a.TTL, a.Data))\n+\t\tif err != nil {\n+\t\t\treturn nil, err\n+\t\t}\n+\t\tif caaRR, ok := rr.(*dns.CAA); ok {\n+\t\t\trrs = append(rrs, caaRR)\n+\t\t}\n+\t}\n+\treturn rrs, nil\n+}\n+\n+func createClient(proxy string) (*http.Client, string, error) {\n+\tu, err := url.Parse(proxy)\n+\tif err != nil {\n+\t\treturn nil, \"\", err\n+\t}\n+\ttransport := &http.Transport{\n+\t\tProxy:               http.ProxyURL(u),\n+\t\tTLSHandshakeTimeout: 10 * time.Second, // default, doesn't override context\n+\t}\n+\treturn &http.Client{\n+\t\tTransport: transport,\n+\t}, u.Host, nil\n+}\n+\n+// CAADistributedResolver holds state needed to talk to GPDNS\n+type CAADistributedResolver struct {\n+\tclients     map[string]*http.Client\n+\tstats       metrics.Scope\n+\tmaxFailures int\n+\ttimeout     time.Duration\n+\tlogger      blog.Logger\n+}\n+\n+// New returns a initialized CAADistributedResolver\n+func New(scope metrics.Scope, timeout time.Duration, maxFailures int, proxies []string) (*CAADistributedResolver, error) {\n+\tcdr := &CAADistributedResolver{stats: scope, maxFailures: maxFailures, timeout: timeout}\n+\tfor _, p := range proxies {\n+\t\tc, h, err := createClient(p)\n+\t\tif err != nil {\n+\t\t\treturn nil, err\n+\t\t}\n+\t\tcdr.clients[h] = c\n+\t}\n+\treturn cdr, nil\n+}\n+\n+func (cdr *CAADistributedResolver) queryCAA(ctx context.Context, req *http.Request, ic *http.Client) ([]*dns.CAA, error) {\n+\tapiResp, err := ctxhttp.Do(ctx, ic, req)\n+\tif err != nil {\n+\t\treturn nil, err\n+\t}\n+\tdefer func() {\n+\t\t_ = apiResp.Body.Close()\n+\t}()\n+\tbody, err := ioutil.ReadAll(apiResp.Body)\n+\tif err != nil {\n+\t\treturn nil, err\n+\t}\n+\tvar respObj response\n+\terr = json.Unmarshal(body, &respObj)\n+\tif err != nil {\n+\t\treturn nil, err\n+\t}\n+\tif respObj.Status != dns.RcodeSuccess {\n+\t\tif respObj.Comment != \"\" {\n+\t\t\treturn nil, fmt.Errorf(\"Query failed with %s: %s\", dns.RcodeToString[respObj.Status], respObj.Comment)\n+\t\t}\n+\t\treturn nil, fmt.Errorf(\"Query failed wtih %s\", dns.RcodeToString[respObj.Status])\n+\t}\n+\n+\treturn parseAnswer(respObj.Answer)\n+}\n+\n+type queryResult struct {\n+\trecords []*dns.CAA\n+\terr     error\n+}\n+\n+type caaSet []*dns.CAA\n+\n+func (cs caaSet) Len() int           { return len(cs) }\n+func (cs caaSet) Less(i, j int) bool { return cs[i].Value < cs[j].Value } // sort by value...?\n+func (cs caaSet) Swap(i, j int)      { cs[i], cs[j] = cs[j], cs[i] }\n+\n+func hashCAASet(set []*dns.CAA) ([32]byte, error) {\n+\tvar err error\n+\toffset, size := 0, 0\n+\tsortedSet := caaSet(set)\n+\tsort.Sort(sortedSet)\n+\tfor _, rr := range sortedSet {\n+\t\tsize += dns.Len(rr)\n+\t}\n+\ttbh := make([]byte, size)\n+\tfor _, rr := range sortedSet {\n+\t\tttl := rr.Hdr.Ttl\n+\t\trr.Hdr.Ttl = 0 // only variable that should jitter\n+\t\toffset, err = dns.PackRR(rr, tbh, offset, nil, false)\n+\t\tif err != nil {\n+\t\t\treturn [32]byte{}, err\n+\t\t}\n+\t\trr.Hdr.Ttl = ttl\n+\t}\n+\treturn sha256.Sum256(tbh), nil\n+}\n+\n+// LookupCAA performs a multipath CAA DNS lookup using GPDNS\n+func (cdr *CAADistributedResolver) LookupCAA(ctx context.Context, domain string) ([]*dns.CAA, error) {\n+\tquery := make(url.Values)\n+\tquery.Add(\"name\", domain)\n+\tquery.Add(\"type\", \"257\") // CAA\n+\n+\t// min of ctx deadline and time.Now().Add(cdr.timeout)\n+\tcaaCtx, cancel := context.WithTimeout(ctx, cdr.timeout)\n+\tresults := make(chan queryResult, len(cdr.clients))\n+\tdefer cancel()\n+\tfor addr, interfaceClient := range cdr.clients {\n+\t\treq, err := http.NewRequest(\"GET\", apiURI, nil)\n+\t\tif err != nil {\n+\t\t\treturn nil, err\n+\t\t}\n+\t\treq.URL.RawQuery = query.Encode()","path":"cdr/resolver.go","position":204,"original_position":204,"commit_id":"1831db576d7931fa0f54ee7afedd0fd39ec28599","original_commit_id":"1831db576d7931fa0f54ee7afedd0fd39ec28599","user":{"login":"riking","id":627891,"avatar_url":"https://avatars.githubusercontent.com/u/627891?v=3","gravatar_id":"","url":"https://api.github.com/users/riking","html_url":"https://github.com/riking","followers_url":"https://api.github.com/users/riking/followers","following_url":"https://api.github.com/users/riking/following{/other_user}","gists_url":"https://api.github.com/users/riking/gists{/gist_id}","starred_url":"https://api.github.com/users/riking/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/riking/subscriptions","organizations_url":"https://api.github.com/users/riking/orgs","repos_url":"https://api.github.com/users/riking/repos","events_url":"https://api.github.com/users/riking/events{/privacy}","received_events_url":"https://api.github.com/users/riking/received_events","type":"User","site_admin":false},"body":"query 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