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Use hashicorp's LRU cache for DNS & certificates (#315)

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Taken from #301

Co-authored-by: Moritz Marquardt <git@momar.de>
Reviewed-on: https://codeberg.org/Codeberg/pages-server/pulls/315
This commit is contained in:
crapStone 2024-05-26 20:05:46 +00:00
parent b9a9467dba
commit 2c41e11f2f
10 changed files with 50 additions and 33 deletions
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6
flake.lock
View File

@ -19,11 +19,11 @@
},
"nixpkgs": {
"locked": {
"lastModified": 1714030708,
"narHash": "sha256-JOGPOxa8N6ySzB7SQBsh0OVz+UXZriyahgvfNHMIY0Y=",
"lastModified": 1716715802,
"narHash": "sha256-usk0vE7VlxPX8jOavrtpOqphdfqEQpf9lgedlY/r66c=",
"owner": "NixOS",
"repo": "nixpkgs",
"rev": "b0d52b31f7f4d80f8bf38f0253652125579c35ff",
"rev": "e2dd4e18cc1c7314e24154331bae07df76eb582f",
"type": "github"
},
"original": {

1
flake.nix
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@ -16,6 +16,7 @@
gcc
go
gofumpt
golangci-lint
gopls
gotools
go-tools

1
go.mod
View File

@ -10,6 +10,7 @@ require (
github.com/creasty/defaults v1.7.0
github.com/go-acme/lego/v4 v4.5.3
github.com/go-sql-driver/mysql v1.6.0
github.com/hashicorp/golang-lru/v2 v2.0.7
github.com/joho/godotenv v1.4.0
github.com/lib/pq v1.10.7
github.com/mattn/go-sqlite3 v1.14.16

2
go.sum
View File

@ -323,6 +323,8 @@ github.com/hashicorp/go-version v1.6.0/go.mod h1:fltr4n8CU8Ke44wwGCBoEymUuxUHl09
github.com/hashicorp/go.net v0.0.1/go.mod h1:hjKkEWcCURg++eb33jQU7oqQcI9XDCnUzHA0oac0k90=
github.com/hashicorp/golang-lru v0.5.0/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
github.com/hashicorp/golang-lru v0.5.1/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
github.com/hashicorp/golang-lru/v2 v2.0.7 h1:a+bsQ5rvGLjzHuww6tVxozPZFVghXaHOwFs4luLUK2k=
github.com/hashicorp/golang-lru/v2 v2.0.7/go.mod h1:QeFd9opnmA6QUJc5vARoKUSoFhyfM2/ZepoAG6RGpeM=
github.com/hashicorp/hcl v1.0.0/go.mod h1:E5yfLk+7swimpb2L/Alb/PJmXilQ/rhwaUYs4T20WEQ=
github.com/hashicorp/logutils v1.0.0/go.mod h1:QIAnNjmIWmVIIkWDTG1z5v++HQmx9WQRO+LraFDTW64=
github.com/hashicorp/mdns v1.0.0/go.mod h1:tL+uN++7HEJ6SQLQ2/p+z2pH24WQKWjBPkE0mNTz8vQ=

34
server/certificates/certificates.go
View File

@ -14,6 +14,7 @@ import (
"github.com/go-acme/lego/v4/certificate"
"github.com/go-acme/lego/v4/challenge/tlsalpn01"
"github.com/go-acme/lego/v4/lego"
"github.com/hashicorp/golang-lru/v2/expirable"
"github.com/reugn/equalizer"
"github.com/rs/zerolog/log"
@ -31,11 +32,14 @@ func TLSConfig(mainDomainSuffix string,
giteaClient *gitea.Client,
acmeClient *AcmeClient,
firstDefaultBranch string,
keyCache, challengeCache, dnsLookupCache, canonicalDomainCache cache.ICache,
challengeCache, canonicalDomainCache cache.ICache,
certDB database.CertDB,
noDNS01 bool,
rawDomain string,
) *tls.Config {
// every cert is at most 24h in the cache and 7 days before expiry the cert is renewed
keyCache := expirable.NewLRU[string, *tls.Certificate](32, nil, 24*time.Hour)
return &tls.Config{
// check DNS name & get certificate from Let's Encrypt
GetCertificate: func(info *tls.ClientHelloInfo) (*tls.Certificate, error) {
@ -86,7 +90,7 @@ func TLSConfig(mainDomainSuffix string,
}
} else {
var targetRepo, targetBranch string
targetOwner, targetRepo, targetBranch = dnsutils.GetTargetFromDNS(domain, mainDomainSuffix, firstDefaultBranch, dnsLookupCache)
targetOwner, targetRepo, targetBranch = dnsutils.GetTargetFromDNS(domain, mainDomainSuffix, firstDefaultBranch)
if targetOwner == "" {
// DNS not set up, return main certificate to redirect to the docs
domain = mainDomainSuffix
@ -107,7 +111,7 @@ func TLSConfig(mainDomainSuffix string,
if tlsCertificate, ok := keyCache.Get(domain); ok {
// we can use an existing certificate object
return tlsCertificate.(*tls.Certificate), nil
return tlsCertificate, nil
}
var tlsCertificate *tls.Certificate
@ -132,9 +136,8 @@ func TLSConfig(mainDomainSuffix string,
}
}
if err := keyCache.Set(domain, tlsCertificate, 15*time.Minute); err != nil {
return nil, err
}
keyCache.Add(domain, tlsCertificate)
return tlsCertificate, nil
},
NextProtos: []string{
@ -186,11 +189,10 @@ func (c *AcmeClient) retrieveCertFromDB(sni, mainDomainSuffix string, useDnsProv
// TODO: document & put into own function
if !strings.EqualFold(sni, mainDomainSuffix) {
tlsCertificate.Leaf, err = x509.ParseCertificate(tlsCertificate.Certificate[0])
tlsCertificate.Leaf, err = leaf(&tlsCertificate)
if err != nil {
return nil, fmt.Errorf("error parsing leaf tlsCert: %w", err)
return nil, err
}
// renew certificates 7 days before they expire
if tlsCertificate.Leaf.NotAfter.Before(time.Now().Add(7 * 24 * time.Hour)) {
// TODO: use ValidTill of custom cert struct
@ -291,6 +293,7 @@ func (c *AcmeClient) obtainCert(acmeClient *lego.Client, domains []string, renew
}
leaf, err := leaf(&tlsCertificate)
if err == nil && leaf.NotAfter.After(time.Now()) {
tlsCertificate.Leaf = leaf
// avoid sending a mock cert instead of a still valid cert, instead abuse CSR field to store time to try again at
renew.CSR = []byte(strconv.FormatInt(time.Now().Add(6*time.Hour).Unix(), 10))
if err := keyDatabase.Put(name, renew); err != nil {
@ -388,11 +391,20 @@ func MaintainCertDB(ctx context.Context, interval time.Duration, acmeClient *Acm
}
}
// leaf returns the parsed leaf certificate, either from c.leaf or by parsing
// leaf returns the parsed leaf certificate, either from c.Leaf or by parsing
// the corresponding c.Certificate[0].
// After successfully parsing the cert c.Leaf gets set to the parsed cert.
func leaf(c *tls.Certificate) (*x509.Certificate, error) {
if c.Leaf != nil {
return c.Leaf, nil
}
return x509.ParseCertificate(c.Certificate[0])
leaf, err := x509.ParseCertificate(c.Certificate[0])
if err != nil {
return nil, fmt.Errorf("tlsCert - failed to parse leaf: %w", err)
}
c.Leaf = leaf
return leaf, err
}

20
server/dns/dns.go
View File

@ -5,22 +5,26 @@ import (
"strings"
"time"
"codeberg.org/codeberg/pages/server/cache"
"github.com/hashicorp/golang-lru/v2/expirable"
)
// lookupCacheTimeout specifies the timeout for the DNS lookup cache.
var lookupCacheTimeout = 15 * time.Minute
const (
lookupCacheValidity = 30 * time.Second
defaultPagesRepo = "pages"
)
var defaultPagesRepo = "pages"
// TODO(#316): refactor to not use global variables
var lookupCache *expirable.LRU[string, string] = expirable.NewLRU[string, string](4096, nil, lookupCacheValidity)
// GetTargetFromDNS searches for CNAME or TXT entries on the request domain ending with MainDomainSuffix.
// If everything is fine, it returns the target data.
func GetTargetFromDNS(domain, mainDomainSuffix, firstDefaultBranch string, dnsLookupCache cache.ICache) (targetOwner, targetRepo, targetBranch string) {
func GetTargetFromDNS(domain, mainDomainSuffix, firstDefaultBranch string) (targetOwner, targetRepo, targetBranch string) {
// Get CNAME or TXT
var cname string
var err error
if cachedName, ok := dnsLookupCache.Get(domain); ok {
cname = cachedName.(string)
if entry, ok := lookupCache.Get(domain); ok {
cname = entry
} else {
cname, err = net.LookupCNAME(domain)
cname = strings.TrimSuffix(cname, ".")
@ -38,7 +42,7 @@ func GetTargetFromDNS(domain, mainDomainSuffix, firstDefaultBranch string, dnsLo
}
}
}
_ = dnsLookupCache.Set(domain, cname, lookupCacheTimeout)
_ = lookupCache.Add(domain, cname)
}
if cname == "" {
return

4
server/handler/handler.go
View File

@ -23,7 +23,7 @@ const (
func Handler(
cfg config.ServerConfig,
giteaClient *gitea.Client,
dnsLookupCache, canonicalDomainCache, redirectsCache cache.ICache,
canonicalDomainCache, redirectsCache cache.ICache,
) http.HandlerFunc {
return func(w http.ResponseWriter, req *http.Request) {
log.Debug().Msg("\n----------------------------------------------------------")
@ -108,7 +108,7 @@ func Handler(
trimmedHost,
pathElements,
cfg.PagesBranches[0],
dnsLookupCache, canonicalDomainCache, redirectsCache)
canonicalDomainCache, redirectsCache)
}
}
}

6
server/handler/handler_custom_domain.go
View File

@ -19,10 +19,10 @@ func handleCustomDomain(log zerolog.Logger, ctx *context.Context, giteaClient *g
trimmedHost string,
pathElements []string,
firstDefaultBranch string,
dnsLookupCache, canonicalDomainCache, redirectsCache cache.ICache,
canonicalDomainCache, redirectsCache cache.ICache,
) {
// Serve pages from custom domains
targetOwner, targetRepo, targetBranch := dns.GetTargetFromDNS(trimmedHost, mainDomainSuffix, firstDefaultBranch, dnsLookupCache)
targetOwner, targetRepo, targetBranch := dns.GetTargetFromDNS(trimmedHost, mainDomainSuffix, firstDefaultBranch)
if targetOwner == "" {
html.ReturnErrorPage(ctx,
"could not obtain repo owner from custom domain",
@ -53,7 +53,7 @@ func handleCustomDomain(log zerolog.Logger, ctx *context.Context, giteaClient *g
return
} else if canonicalDomain != trimmedHost {
// only redirect if the target is also a codeberg page!
targetOwner, _, _ = dns.GetTargetFromDNS(strings.SplitN(canonicalDomain, "/", 2)[0], mainDomainSuffix, firstDefaultBranch, dnsLookupCache)
targetOwner, _, _ = dns.GetTargetFromDNS(strings.SplitN(canonicalDomain, "/", 2)[0], mainDomainSuffix, firstDefaultBranch)
if targetOwner != "" {
ctx.Redirect("https://"+canonicalDomain+"/"+targetOpt.TargetPath, http.StatusTemporaryRedirect)
return

2
server/handler/handler_test.go
View File

@ -29,7 +29,7 @@ func TestHandlerPerformance(t *testing.T) {
AllowedCorsDomains: []string{"raw.codeberg.org", "fonts.codeberg.org", "design.codeberg.org"},
PagesBranches: []string{"pages"},
}
testHandler := Handler(serverCfg, giteaClient, cache.NewInMemoryCache(), cache.NewInMemoryCache(), cache.NewInMemoryCache())
testHandler := Handler(serverCfg, giteaClient, cache.NewInMemoryCache(), cache.NewInMemoryCache())
testCase := func(uri string, status int) {
t.Run(uri, func(t *testing.T) {

7
server/startup.go
View File

@ -66,12 +66,9 @@ func Serve(ctx *cli.Context) error {
}
defer closeFn()
keyCache := cache.NewInMemoryCache()
challengeCache := cache.NewInMemoryCache()
// canonicalDomainCache stores canonical domains
canonicalDomainCache := cache.NewInMemoryCache()
// dnsLookupCache stores DNS lookups for custom domains
dnsLookupCache := cache.NewInMemoryCache()
// redirectsCache stores redirects in _redirects files
redirectsCache := cache.NewInMemoryCache()
// clientResponseCache stores responses from the Gitea server
@ -104,7 +101,7 @@ func Serve(ctx *cli.Context) error {
giteaClient,
acmeClient,
cfg.Server.PagesBranches[0],
keyCache, challengeCache, dnsLookupCache, canonicalDomainCache,
challengeCache, canonicalDomainCache,
certDB,
cfg.ACME.NoDNS01,
cfg.Server.RawDomain,
@ -134,7 +131,7 @@ func Serve(ctx *cli.Context) error {
}
// Create ssl handler based on settings
sslHandler := handler.Handler(cfg.Server, giteaClient, dnsLookupCache, canonicalDomainCache, redirectsCache)
sslHandler := handler.Handler(cfg.Server, giteaClient, canonicalDomainCache, redirectsCache)
// Start the ssl listener
log.Info().Msgf("Start SSL server using TCP listener on %s", listener.Addr())