4 files changed, 902 insertions, 15 deletions

diff --git a/README.md b/README.md
index 3819ab5..7e7323b 100644
--- a/README.md
+++ b/README.md
@@ -14,6 +14,46 @@ service which provides dynamic credentials or environment variables, in which
 case you should still manually rotate credentials but have one choke-point to
 do that.
 
+## Hashicorp Vault Integration
+The server supports using Hashicorp Vault to retrieve an AWS IAM user
+credential using the AWS back-end. It will also renew this credential as
+long as possible. This functionality is not enabled by default but can
+be enabled with command line flags and environment variables.
+
+The [standard environment variables](
+https://developer.hashicorp.com/vault/docs/commands#environme nt-variables)
+are supported. Minimally ``VAULT_ADDR`` must be specified as a URL to the
+Vault server. Additionally, to support
+[AppRole](https://developer.hashicorp.com/vault/docs/auth/approle) authentication
+``VAULT_APPROLE_ROLE_ID`` and ``VAULT_APPROLE_SECRET_ID`` are supported. If
+these variables are found in the environment AppRole authentication will be
+automatically attempted and failure of that will cause the server to fail
+starting.
+
+Once the proper environment variables are setup, enable
+Vault integration by passing ``--enable-vault`` and
+``--vault-path=secret-path`` on the command line. For example, assuming that
+you have the AWS back-end mounted at ``aws/`` in Vault and you want to use an
+IAM user credential called ``email-server``, run the proxy like so:
+
+```
+VAULT_ADDR="https://your-vault-server:8200/" \
+VAULT_APPROLE_ROLE_ID="..." \
+VAULT_APPROLE_SECRET_ID="..." \
+    ./ses-smtpd-proxy --enable-vault \
+        --vault-path=aws/creds/email-server localhost:2500
+```
+
+## Prometheus Integration
+By default the server will log some Prometheus metrics for messages
+sent and errors. The Prometheus metrics will be served on ``:2501``
+at the path ``/metrics`` by default. The bind address and port can be
+customized by passing ``--prometheus-bind=bind-string`` in the format
+expected by Go's http.Server.
+
+Prometheus metric serving (though not metric aggregation) can be
+disabled by passing ``--disable-prometheus`` on the command line.
+
 ## Usage
 By default the command takes no arguments and will listen on port 2500 on all
 interfaces. The listen interfaces and port can be specified as the only
@@ -23,6 +63,9 @@ argument separated with a colon like so:
 ./ses-smtpd-proxy 127.0.0.1:2600
 ```
 
+If not using the Vault integration noted above, it is expected that your
+environment is configured in some way that is supported by the AWS SDK.
+
 ## Security Warning
 This server speaks plain unauthenticated SMTP (no TLS) so it's not suitable for
 use in an untrusted environment nor on the public internet. I don't have these
@@ -30,7 +73,7 @@ use-cases but I would accept pull requests implementing these features if you
 do have the use-case and want to add them.
 
 ## Building
-To build the binary run `make ses-smtpd-proxy`. 
+To build the binary run `make ses-smtpd-proxy`.
 
 To build a Docker image, which is based on Alpine Latest, run `make docker` or
 `make publish`. The later command will build and push the image. To override
diff --git a/go.mod b/go.mod
index 98dea2e..c9259ef 100644
--- a/go.mod
+++ b/go.mod
@@ -2,6 +2,63 @@ module code.crute.us/mcrute/ses-smtpd-proxy
 
 go 1.18
 
-require github.com/aws/aws-sdk-go v1.44.154
+require (
+        github.com/aws/aws-sdk-go v1.44.154
+        github.com/hashicorp/vault/api v1.8.2
+        github.com/hashicorp/vault/api/auth/approle v0.3.0
+        github.com/prometheus/client_golang v1.14.0
+)
 
-require github.com/jmespath/go-jmespath v0.4.0 // indirect
+require (
+        github.com/armon/go-metrics v0.3.9 // indirect
+        github.com/armon/go-radix v1.0.0 // indirect
+        github.com/beorn7/perks v1.0.1 // indirect
+        github.com/cenkalti/backoff/v3 v3.0.0 // indirect
+        github.com/cespare/xxhash/v2 v2.1.2 // indirect
+        github.com/fatih/color v1.7.0 // indirect
+        github.com/golang/protobuf v1.5.2 // indirect
+        github.com/golang/snappy v0.0.4 // indirect
+        github.com/hashicorp/errwrap v1.1.0 // indirect
+        github.com/hashicorp/go-cleanhttp v0.5.2 // indirect
+        github.com/hashicorp/go-hclog v0.16.2 // indirect
+        github.com/hashicorp/go-immutable-radix v1.3.1 // indirect
+        github.com/hashicorp/go-multierror v1.1.1 // indirect
+        github.com/hashicorp/go-plugin v1.4.5 // indirect
+        github.com/hashicorp/go-retryablehttp v0.6.6 // indirect
+        github.com/hashicorp/go-rootcerts v1.0.2 // indirect
+        github.com/hashicorp/go-secure-stdlib/mlock v0.1.1 // indirect
+        github.com/hashicorp/go-secure-stdlib/parseutil v0.1.6 // indirect
+        github.com/hashicorp/go-secure-stdlib/strutil v0.1.2 // indirect
+        github.com/hashicorp/go-sockaddr v1.0.2 // indirect
+        github.com/hashicorp/go-uuid v1.0.2 // indirect
+        github.com/hashicorp/go-version v1.2.0 // indirect
+        github.com/hashicorp/golang-lru v0.5.4 // indirect
+        github.com/hashicorp/hcl v1.0.0 // indirect
+        github.com/hashicorp/vault/sdk v0.6.0 // indirect
+        github.com/hashicorp/yamux v0.0.0-20180604194846-3520598351bb // indirect
+        github.com/jmespath/go-jmespath v0.4.0 // indirect
+        github.com/mattn/go-colorable v0.1.6 // indirect
+        github.com/mattn/go-isatty v0.0.12 // indirect
+        github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect
+        github.com/mitchellh/copystructure v1.0.0 // indirect
+        github.com/mitchellh/go-homedir v1.1.0 // indirect
+        github.com/mitchellh/go-testing-interface v1.0.0 // indirect
+        github.com/mitchellh/mapstructure v1.5.0 // indirect
+        github.com/mitchellh/reflectwalk v1.0.0 // indirect
+        github.com/oklog/run v1.0.0 // indirect
+        github.com/pierrec/lz4 v2.5.2+incompatible // indirect
+        github.com/prometheus/client_model v0.3.0 // indirect
+        github.com/prometheus/common v0.37.0 // indirect
+        github.com/prometheus/procfs v0.8.0 // indirect
+        github.com/ryanuber/go-glob v1.0.0 // indirect
+        go.uber.org/atomic v1.9.0 // indirect
+        golang.org/x/crypto v0.0.0-20210921155107-089bfa567519 // indirect
+        golang.org/x/net v0.1.0 // indirect
+        golang.org/x/sys v0.1.0 // indirect
+        golang.org/x/text v0.4.0 // indirect
+        golang.org/x/time v0.0.0-20200416051211-89c76fbcd5d1 // indirect
+        google.golang.org/genproto v0.0.0-20200825200019-8632dd797987 // indirect
+        google.golang.org/grpc v1.41.0 // indirect
+        google.golang.org/protobuf v1.28.1 // indirect
+        gopkg.in/square/go-jose.v2 v2.5.1 // indirect
+)
diff --git a/go.sum b/go.sum
index 41d1fcf..4ff8836 100644
--- a/go.sum
+++ b/go.sum
@@ -1,42 +1,669 @@
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
+cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
+cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
+cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
+cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
+cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
+cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4=
+cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M=
+cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc=
+cloud.google.com/go v0.56.0/go.mod h1:jr7tqZxxKOVYizybht9+26Z/gUq7tiRzu+ACVAMbKVk=
+cloud.google.com/go v0.57.0/go.mod h1:oXiQ6Rzq3RAkkY7N6t3TcE6jE+CIBBbA36lwQ1JyzZs=
+cloud.google.com/go v0.62.0/go.mod h1:jmCYTdRCQuc1PHIIJ/maLInMho30T/Y0M4hTdTShOYc=
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diff --git a/main.go b/main.go
index a1a2625..6c153fa 100644
--- a/main.go
+++ b/main.go
@@ -2,13 +2,23 @@ package main
 
 import (
         "bytes"
+        "context"
+        "flag"
         "fmt"
         "log"
+        "net/http"
         "os"
 
         "code.crute.us/mcrute/ses-smtpd-proxy/smtpd"
+        "github.com/aws/aws-sdk-go/aws"
+        "github.com/aws/aws-sdk-go/aws/credentials"
         "github.com/aws/aws-sdk-go/aws/session"
         "github.com/aws/aws-sdk-go/service/ses"
+        "github.com/hashicorp/vault/api"
+        "github.com/hashicorp/vault/api/auth/approle"
+        "github.com/prometheus/client_golang/prometheus"
+        "github.com/prometheus/client_golang/prometheus/promauto"
+        "github.com/prometheus/client_golang/prometheus/promhttp"
 )
 
 const (
@@ -18,6 +28,34 @@ const (
 
 var sesClient *ses.SES
 
+var (
+        emailSent = promauto.NewCounter(prometheus.CounterOpts{
+                Namespace: "smtpd",
+                Name:      "email_send_success_total",
+                Help:      "Total number of successfuly sent emails",
+        })
+        emailError = promauto.NewCounterVec(prometheus.CounterOpts{
+                Namespace: "smtpd",
+                Name:      "email_send_fail_total",
+                Help:      "Total number emails that failed to send",
+        }, []string{"type"})
+        sesError = promauto.NewCounter(prometheus.CounterOpts{
+                Namespace: "smtpd",
+                Name:      "ses_error_total",
+                Help:      "Total number errors with SES",
+        })
+        credentialRenewalSuccess = promauto.NewCounter(prometheus.CounterOpts{
+                Namespace: "smtpd",
+                Name:      "credential_renewal_success_total",
+                Help:      "Total number successful credential renewals",
+        })
+        credentialRenewalError = promauto.NewCounter(prometheus.CounterOpts{
+                Namespace: "smtpd",
+                Name:      "credential_renewal_error_total",
+                Help:      "Total number errors during credential renewal",
+        })
+)
+
 type Envelope struct {
         from  string
         rcpts []*string
@@ -32,6 +70,7 @@ func (e *Envelope) AddRecipient(rcpt smtpd.MailAddress) error {
 
 func (e *Envelope) BeginData() error {
         if len(e.rcpts) == 0 {
+                emailError.With(prometheus.Labels{"type": "no valid recipients"}).Inc()
                 return smtpd.SMTPError("554 5.5.1 Error: no valid recipients")
         }
         return nil
@@ -40,7 +79,8 @@ func (e *Envelope) BeginData() error {
 func (e *Envelope) Write(line []byte) error {
         e.b.Write(line)
         if e.b.Len() > SesSizeLimit { // SES limitation
-                log.Printf("message size %d exceeds SES limit of %d\n", e.b.Len(), SesSizeLimit)
+                emailError.With(prometheus.Labels{"type": "minimum message size exceed"}).Inc()
+                log.Printf("message size %d exceeds SES limit of %d", e.b.Len(), SesSizeLimit)
                 return smtpd.SMTPError("554 5.5.1 Error: maximum message size exceeded")
         }
         return nil
@@ -52,10 +92,10 @@ func (e *Envelope) logMessageSend() {
                 dr[i] = *e.rcpts[i]
         }
         log.Printf("sending message from %+v to %+v", e.from, dr)
+        emailSent.Inc()
 }
 
 func (e *Envelope) Close() error {
-        e.logMessageSend()
         r := &ses.SendRawEmailInput{
                 Source:       &e.from,
                 Destinations: e.rcpts,
@@ -64,30 +104,150 @@ func (e *Envelope) Close() error {
         _, err := sesClient.SendRawEmail(r)
         if err != nil {
                 log.Printf("ERROR: ses: %v", err)
-                return smtpd.SMTPError(fmt.Sprintf("451 4.5.1 Temporary server error. Please try again later: %v", err))
+                emailError.With(prometheus.Labels{"type": "ses error"}).Inc()
+                sesError.Inc()
+                return smtpd.SMTPError("451 4.5.1 Temporary server error. Please try again later")
         }
+        e.logMessageSend()
         return err
 }
 
+func renewSecret(vc *api.Client, s *api.Secret) error {
+        w, err := vc.NewLifetimeWatcher(&api.LifetimeWatcherInput{Secret: s})
+        if err != nil {
+                return err
+        }
+        go w.Start()
+
+        go func() {
+                for {
+                        select {
+                        case err := <-w.DoneCh():
+                                if err != nil {
+                                        credentialRenewalError.Inc()
+                                        log.Fatalf("Error renewing credential: %s", err)
+                                }
+                        case renewal := <-w.RenewCh():
+                                credentialRenewalSuccess.Inc()
+                                log.Printf("Successfully renewed: %#v", renewal)
+                        }
+                }
+        }()
+
+        return nil
+}
+
+func getVaultSecret(path string) (credentials.Value, error) {
+        var r credentials.Value
+
+        vc, err := api.NewClient(api.DefaultConfig())
+        if err != nil {
+                return r, err
+        }
+
+        // Use AppRole if it's in the environment, otherwise assume VAULT_TOKEN
+        // was provided in the environment.
+        if roleID := os.Getenv("VAULT_APPROLE_ROLE_ID"); roleID != "" {
+                appRoleAuth, err := approle.NewAppRoleAuth(roleID, &approle.SecretID{
+                        FromEnv: "VAULT_APPROLE_SECRET_ID",
+                })
+                if err != nil {
+                        return r, fmt.Errorf("unable to initialize AppRole auth method: %w", err)
+                }
+                if loginSecret, err := vc.Auth().Login(context.Background(), appRoleAuth); err != nil {
+                        return r, fmt.Errorf("unable to login to AppRole auth method: %w", err)
+                } else {
+                        if err := renewSecret(vc, loginSecret); err != nil {
+                                return r, err
+                        }
+                }
+        }
+
+        secret, err := vc.Logical().Read(path)
+        if err != nil {
+                return r, err
+        }
+        if secret == nil {
+                return r, fmt.Errorf("Vault returned no AWS secret")
+        }
+
+        keyId, ok := secret.Data["access_key"]
+        if !ok {
+                return r, fmt.Errorf("Vault secret had no access_key")
+        }
+
+        secretKey, ok := secret.Data["secret_key"]
+        if !ok {
+                return r, fmt.Errorf("Vault secret had no secret_key")
+        }
+
+        r.AccessKeyID = keyId.(string)
+        r.SecretAccessKey = secretKey.(string)
+
+        return r, renewSecret(vc, secret)
+}
+
+func makeSesClient(enableVault bool, vaultPath string) (*ses.SES, error) {
+        var err error
+        var s *session.Session
+
+        if enableVault {
+                cred, err := getVaultSecret(vaultPath)
+                if err != nil {
+                        return nil, err
+                }
+
+                s, err = session.NewSession(&aws.Config{
+                        Credentials: credentials.NewStaticCredentialsFromCreds(cred),
+                })
+        } else {
+                s, err = session.NewSession()
+        }
+        if err != nil {
+                return nil, err
+        }
+
+        return ses.New(s), nil
+}
+
 func main() {
-        sesClient = ses.New(session.Must(session.NewSession()))
-        addr := DefaultAddr
+        var err error
+
+        disablePrometheus := flag.Bool("disable-prometheus", false, "Disables prometheus metrics server")
+        prometheusBind := flag.String("prometheus-bind", ":2501", "Address/port on which to bind Prometheus server")
+        enableVault := flag.Bool("enable-vault", false, "Enable fetching AWS IAM credentials from a Vault server")
+        vaultPath := flag.String("vault-path", "", "Full path to Vault credential (ex: \"aws/creds/my-mail-user\")")
+
+        flag.Parse()
+
+        sesClient, err = makeSesClient(*enableVault, *vaultPath)
+        if err != nil {
+                log.Fatalf("Error creating AWS session: %s", err)
+        }
 
-        if len(os.Args) == 2 {
-                addr = os.Args[1]
-        } else if len(os.Args) > 2 {
+        addr := DefaultAddr
+        if flag.Arg(0) != "" {
+                addr = flag.Arg(0)
+        } else if flag.NArg() > 1 {
                 log.Fatalf("usage: %s [listen_host:port]", os.Args[0])
         }
 
+        if !*disablePrometheus {
+                sm := http.NewServeMux()
+                ps := &http.Server{Addr: *prometheusBind, Handler: sm}
+                sm.Handle("/metrics", promhttp.Handler())
+                go ps.ListenAndServe()
+        }
+
         s := &smtpd.Server{
                 Addr: addr,
                 OnNewMail: func(c smtpd.Connection, from smtpd.MailAddress) (smtpd.Envelope, error) {
                         return &Envelope{from: from.Email()}, nil
                 },
         }
+
         log.Printf("ListenAndServe on %s", addr)
-        err := s.ListenAndServe()
-        if err != nil {
+        if err := s.ListenAndServe(); err != nil {
                 log.Fatalf("ListenAndServe: %v", err)
         }
 }