CVE-2020-24710 (published 2020-10-28T20:15Z)

Gophish before 0.11.0 allows SSRF attacks.

Severity: MEDIUM
CVSS v2 base score: 5.0 (AV:N/AC:L/Au:N/C:P/I:N/A:N)
CVSS v3 base score: 5.3, MEDIUM (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N)

Weakness information:
cwe_id: CWE-918
cwe_name: Server-Side Request Forgery (SSRF)
description: The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.
extended_description: By providing URLs to unexpected hosts or ports, attackers can make it appear that the server is sending the request, possibly bypassing access controls such as firewalls that prevent the attackers from accessing the URLs directly. The server can be used as a proxy to conduct port scanning of hosts in internal networks, use other URLs such as that can access documents on the system (using file://), or use other protocols such as gopher:// or tftp://, which may provide greater control over the contents of requests.
         

Fix information:
repo_url: https://github.com/gophish/gophish
commit_details: repo_url: https://github.com/gophish/gophish
author: Jordan Wright
author_date: 2020-08-20 09:36:18-05:00
msg: Implement SSRF Mitigations (#1940)

Initial commit of SSRF mitigations.

This fixes #1908 by creating a *net.Dialer which restricts outbound connections to only allowed IP ranges. This implementation is based on the blog post at https://www.agwa.name/blog/post/preventing_server_side_request_forgery_in_golang

To keep things backwards compatible, by default we'll only block connections to 169.254.169.254, the link-local IP address commonly used in cloud environments to retrieve metadata about the running instance. For other internal addresses (e.g. localhost or RFC 1918 addresses), it's assumed that those are available to Gophish.

To support more secure environments, we introduce the `allowed_internal_hosts` configuration option where an admin can set one or more IP ranges in CIDR format. If addresses are specified here, then all internal connections will be blocked except to these hosts.

There are various bits about this approach I don't really like. For example, since various packages all need this functionality, I had to make the RestrictedDialer a global singleton rather than a dependency off of, say, the admin server. Additionally, since webhooks are implemented via a singleton, I had to introduce a new function, `SetTransport`.

Finally, I had to make an update in the gomail package to support a custom net.Dialer.
repository: repo_url: https://github.com/gophish/gophish
repo_name: gophish/gophish
description: Open-Source Phishing Toolkit
repo_language: Go
owner: gophish
file_changes: filename: config.go
change_type: ModificationType.MODIFY
diff: @@ -9,11 +9,12 @@ import (
 
 // AdminServer represents the Admin server configuration details
 type AdminServer struct {
-	ListenURL string `json:"listen_url"`
-	UseTLS    bool   `json:"use_tls"`
-	CertPath  string `json:"cert_path"`
-	KeyPath   string `json:"key_path"`
-	CSRFKey   string `json:"csrf_key"`
+	ListenURL            string   `json:"listen_url"`
+	UseTLS               bool     `json:"use_tls"`
+	CertPath             string   `json:"cert_path"`
+	KeyPath              string   `json:"key_path"`
+	CSRFKey              string   `json:"csrf_key"`
+	AllowedInternalHosts []string `json:"allowed_internal_hosts"`
 }
 
 // PhishServer represents the Phish server configuration details

programming_language: Go
filename: import.go
change_type: ModificationType.MODIFY
diff: @@ -10,6 +10,7 @@ import (
 	"strings"
 
 	"github.com/PuerkitoBio/goquery"
+	"github.com/gophish/gophish/dialer"
 	log "github.com/gophish/gophish/logger"
 	"github.com/gophish/gophish/models"
 	"github.com/gophish/gophish/util"
@@ -113,7 +114,9 @@ func (as *Server) ImportSite(w http.ResponseWriter, r *http.Request) {
 		JSONResponse(w, models.Response{Success: false, Message: err.Error()}, http.StatusBadRequest)
 		return
 	}
+	restrictedDialer := dialer.Dialer()
 	tr := &http.Transport{
+		DialContext: restrictedDialer.DialContext,
 		TLSClientConfig: &tls.Config{
 			InsecureSkipVerify: true,
 		},

programming_language: Go
filename: import_test.go
change_type: ModificationType.ADD
diff: @@ -0,0 +1,84 @@
+package api
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"github.com/gophish/gophish/dialer"
+	"github.com/gophish/gophish/models"
+)
+
+func makeImportRequest(ctx *testContext, allowedHosts []string, url string) *httptest.ResponseRecorder {
+	orig := dialer.DefaultDialer.AllowedHosts()
+	dialer.SetAllowedHosts(allowedHosts)
+	req := httptest.NewRequest(http.MethodPost, "/api/import/site",
+		bytes.NewBuffer([]byte(fmt.Sprintf(`
+			{
+				"url" : "%s"
+			}
+		`, url))))
+	req.Header.Set("Content-Type", "application/json")
+	response := httptest.NewRecorder()
+	ctx.apiServer.ImportSite(response, req)
+	dialer.SetAllowedHosts(orig)
+	return response
+}
+
+func TestDefaultDeniedImport(t *testing.T) {
+	ctx := setupTest(t)
+	metadataURL := "http://169.254.169.254/latest/meta-data/"
+	response := makeImportRequest(ctx, []string{}, metadataURL)
+	expectedCode := http.StatusBadRequest
+	if response.Code != expectedCode {
+		t.Fatalf("incorrect status code received. expected %d got %d", expectedCode, response.Code)
+	}
+	got := &models.Response{}
+	err := json.NewDecoder(response.Body).Decode(got)
+	if err != nil {
+		t.Fatalf("error decoding body: %v", err)
+	}
+	if !strings.Contains(got.Message, "upstream connection denied") {
+		t.Fatalf("incorrect response error provided: %s", got.Message)
+	}
+}
+
+func TestDefaultAllowedImport(t *testing.T) {
+	ctx := setupTest(t)
+	h := "<html><head></head><body><img src=\"/test.png\"/></body></html>"
+	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		fmt.Fprintln(w, h)
+	}))
+	defer ts.Close()
+	response := makeImportRequest(ctx, []string{}, ts.URL)
+	expectedCode := http.StatusOK
+	if response.Code != expectedCode {
+		t.Fatalf("incorrect status code received. expected %d got %d", expectedCode, response.Code)
+	}
+}
+
+func TestCustomDeniedImport(t *testing.T) {
+	ctx := setupTest(t)
+	h := "<html><head></head><body><img src=\"/test.png\"/></body></html>"
+	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		fmt.Fprintln(w, h)
+	}))
+	defer ts.Close()
+	response := makeImportRequest(ctx, []string{"192.168.1.1"}, ts.URL)
+	expectedCode := http.StatusBadRequest
+	if response.Code != expectedCode {
+		t.Fatalf("incorrect status code received. expected %d got %d", expectedCode, response.Code)
+	}
+	got := &models.Response{}
+	err := json.NewDecoder(response.Body).Decode(got)
+	if err != nil {
+		t.Fatalf("error decoding body: %v", err)
+	}
+	if !strings.Contains(got.Message, "upstream connection denied") {
+		t.Fatalf("incorrect response error provided: %s", got.Message)
+	}
+}

programming_language: Go
filename: dialer.go
change_type: ModificationType.ADD
diff: @@ -0,0 +1,158 @@
+package dialer
+
+import (
+	"fmt"
+	"net"
+	"syscall"
+	"time"
+)
+
+// RestrictedDialer is used to create a net.Dialer which restricts outbound
+// connections to only allowlisted IP ranges.
+type RestrictedDialer struct {
+	allowedHosts []*net.IPNet
+}
+
+// DefaultDialer is a global instance of a RestrictedDialer
+var DefaultDialer = &RestrictedDialer{}
+
+// SetAllowedHosts sets the list of allowed hosts or IP ranges for the default
+// dialer.
+func SetAllowedHosts(allowed []string) {
+	DefaultDialer.SetAllowedHosts(allowed)
+}
+
+// AllowedHosts returns the configured hosts that are allowed for the dialer.
+func (d *RestrictedDialer) AllowedHosts() []string {
+	ranges := []string{}
+	for _, ipRange := range d.allowedHosts {
+		ranges = append(ranges, ipRange.String())
+	}
+	return ranges
+}
+
+// SetAllowedHosts sets the list of allowed hosts or IP ranges for the dialer.
+func (d *RestrictedDialer) SetAllowedHosts(allowed []string) error {
+	for _, ipRange := range allowed {
+		// For flexibility, try to parse as an IP first since this will
+		// undoubtedly cause issues. If it works, then just append the
+		// appropriate subnet mask, then parse as CIDR
+		if singleIP := net.ParseIP(ipRange); singleIP != nil {
+			if singleIP.To4() != nil {
+				ipRange += "/32"
+			} else {
+				ipRange += "/128"
+			}
+		}
+		_, parsed, err := net.ParseCIDR(ipRange)
+		if err != nil {
+			return fmt.Errorf("provided ip range is not valid CIDR notation: %v", err)
+		}
+		d.allowedHosts = append(d.allowedHosts, parsed)
+	}
+	return nil
+}
+
+// Dialer returns a net.Dialer that restricts outbound connections to only the
+// addresses allowed by the DefaultDialer.
+func Dialer() *net.Dialer {
+	return DefaultDialer.Dialer()
+}
+
+// Dialer returns a net.Dialer that restricts outbound connections to only the
+// allowed addresses over TCP.
+//
+// By default, since Gophish anticipates connections originating to hosts on
+// the local network, we only deny access to the link-local addresses at
+// 169.254.0.0/16.
+//
+// If hosts are provided, then Gophish blocks access to all local addresses
+// except the ones provided.
+//
+// This implementation is based on the blog post by Andrew Ayer at
+// https://www.agwa.name/blog/post/preventing_server_side_request_forgery_in_golang
+func (d *RestrictedDialer) Dialer() *net.Dialer {
+	return &net.Dialer{
+		Timeout:   30 * time.Second,
+		KeepAlive: 30 * time.Second,
+		Control:   restrictedControl(d.allowedHosts),
+	}
+}
+
+// defaultDeny represents the list of IP ranges that we want to block unless
+// explicitly overriden.
+var defaultDeny = []string{
+	"169.254.0.0/16", // Link-local (used for VPS instance metadata)
+}
+
+// allInternal represents all internal hosts such that the only connections
+// allowed are external ones.
+var allInternal = []string{
+	"0.0.0.0/8",
+	"127.0.0.0/8",        // IPv4 loopback
+	"10.0.0.0/8",         // RFC1918
+	"100.64.0.0/10",      // CGNAT
+	"172.16.0.0/12",      // RFC1918
+	"169.254.0.0/16",     // RFC3927 link-local
+	"192.88.99.0/24",     // IPv6 to IPv4 Relay
+	"192.168.0.0/16",     // RFC1918
+	"198.51.100.0/24",    // TEST-NET-2
+	"203.0.113.0/24",     // TEST-NET-3
+	"224.0.0.0/4",        // Multicast
+	"240.0.0.0/4",        // Reserved
+	"255.255.255.255/32", // Broadcast
+	"::/0",               // Default route
+	"::/128",             // Unspecified address
+	"::1/128",            // IPv6 loopback
+	"::ffff:0:0/96",      // IPv4 mapped addresses.
+	"::ffff:0:0:0/96",    // IPv4 translated addresses.
+	"fe80::/10",          // IPv6 link-local
+	"fc00::/7",           // IPv6 unique local addr
+}
+
+type dialControl = func(network, address string, c syscall.RawConn) error
+
+type restrictedDialer struct {
+	*net.Dialer
+	allowed []string
+}
+
+func restrictedControl(allowed []*net.IPNet) dialControl {
+	return func(network string, address string, conn syscall.RawConn) error {
+		if !(network == "tcp4" || network == "tcp6") {
+			return fmt.Errorf("%s is not a safe network type", network)
+		}
+
+		host, _, err := net.SplitHostPort(address)
+		if err != nil {
+			return fmt.Errorf("%s is not a valid host/port pair: %s", address, err)
+		}
+
+		ip := net.ParseIP(host)
+		if ip == nil {
+			return fmt.Errorf("%s is not a valid IP address", host)
+		}
+
+		denyList := defaultDeny
+		if len(allowed) > 0 {
+			denyList = allInternal
+		}
+
+		for _, ipRange := range allowed {
+			if ipRange.Contains(ip) {
+				return nil
+			}
+		}
+
+		for _, ipRange := range denyList {
+			_, parsed, err := net.ParseCIDR(ipRange)
+			if err != nil {
+				return fmt.Errorf("error parsing denied range: %v", err)
+			}
+			if parsed.Contains(ip) {
+				return fmt.Errorf("upstream connection denied to internal host")
+			}
+		}
+		return nil
+	}
+}

programming_language: Go
filename: dialer_test.go
change_type: ModificationType.ADD
diff: @@ -0,0 +1,85 @@
+package dialer
+
+import (
+	"fmt"
+	"net"
+	"strings"
+	"syscall"
+	"testing"
+)
+
+func TestDefaultDeny(t *testing.T) {
+	control := restrictedControl([]*net.IPNet{})
+	host := "169.254.169.254"
+	expected := fmt.Errorf("upstream connection denied to internal host at %s", host)
+	conn := new(syscall.RawConn)
+	got := control("tcp4", fmt.Sprintf("%s:80", host), *conn)
+	if !strings.Contains(got.Error(), "upstream connection denied") {
+		t.Fatalf("unexpected error dialing denylisted host. expected %v got %v", expected, got)
+	}
+}
+
+func TestDefaultAllow(t *testing.T) {
+	control := restrictedControl([]*net.IPNet{})
+	host := "1.1.1.1"
+	conn := new(syscall.RawConn)
+	got := control("tcp4", fmt.Sprintf("%s:80", host), *conn)
+	if got != nil {
+		t.Fatalf("error dialing allowed host. got %v", got)
+	}
+}
+
+func TestCustomAllow(t *testing.T) {
+	host := "127.0.0.1"
+	_, ipRange, _ := net.ParseCIDR(fmt.Sprintf("%s/32", host))
+	allowed := []*net.IPNet{ipRange}
+	control := restrictedControl(allowed)
+	conn := new(syscall.RawConn)
+	got := control("tcp4", fmt.Sprintf("%s:80", host), *conn)
+	if got != nil {
+		t.Fatalf("error dialing allowed host. got %v", got)
+	}
+}
+
+func TestCustomDeny(t *testing.T) {
+	host := "127.0.0.1"
+	_, ipRange, _ := net.ParseCIDR(fmt.Sprintf("%s/32", host))
+	allowed := []*net.IPNet{ipRange}
+	control := restrictedControl(allowed)
+	conn := new(syscall.RawConn)
+	expected := fmt.Errorf("upstream connection denied to internal host at %s", host)
+	got := control("tcp4", "192.168.1.2:80", *conn)
+	if !strings.Contains(got.Error(), "upstream connection denied") {
+		t.Fatalf("unexpected error dialing denylisted host. expected %v got %v", expected, got)
+	}
+}
+
+func TestSingleIP(t *testing.T) {
+	orig := DefaultDialer.AllowedHosts()
+	host := "127.0.0.1"
+	DefaultDialer.SetAllowedHosts([]string{host})
+	control := DefaultDialer.Dialer().Control
+	conn := new(syscall.RawConn)
+	expected := fmt.Errorf("upstream connection denied to internal host at %s", host)
+	got := control("tcp4", "192.168.1.2:80", *conn)
+	if !strings.Contains(got.Error(), "upstream connection denied") {
+		t.Fatalf("unexpected error dialing denylisted host. expected %v got %v", expected, got)
+	}
+
+	host = "::1"
+	DefaultDialer.SetAllowedHosts([]string{host})
+	control = DefaultDialer.Dialer().Control
+	conn = new(syscall.RawConn)
+	expected = fmt.Errorf("upstream connection denied to internal host at %s", host)
+	got = control("tcp4", "192.168.1.2:80", *conn)
+	if !strings.Contains(got.Error(), "upstream connection denied") {
+		t.Fatalf("unexpected error dialing denylisted host. expected %v got %v", expected, got)
+	}
+
+	// Test an allowed connection
+	got = control("tcp4", fmt.Sprintf("[%s]:80", host), *conn)
+	if got != nil {
+		t.Fatalf("error dialing allowed host. got %v", got)
+	}
+	DefaultDialer.SetAllowedHosts(orig)
+}

programming_language: Go
filename: go.mod
change_type: ModificationType.MODIFY
diff: @@ -11,7 +11,7 @@ require (
 	github.com/emersion/go-imap v1.0.4
 	github.com/emersion/go-message v0.12.0
 	github.com/go-sql-driver/mysql v1.5.0
-	github.com/gophish/gomail v0.0.0-20180314010319-cf7e1a5479be
+	github.com/gophish/gomail v0.0.0-20200818021916-1f6d0dfd512e
 	github.com/gorilla/context v1.1.1
 	github.com/gorilla/csrf v1.6.2
 	github.com/gorilla/handlers v1.4.2
@@ -29,7 +29,5 @@ require (
 	golang.org/x/crypto v0.0.0-20200128174031-69ecbb4d6d5d
 	golang.org/x/time v0.0.0-20200416051211-89c76fbcd5d1
 	gopkg.in/alecthomas/kingpin.v2 v2.2.6
-	gopkg.in/alexcesaro/quotedprintable.v3 v3.0.0-20150716171945-2caba252f4dc // indirect
 	gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405
-	gopkg.in/gomail.v2 v2.0.0-20160411212932-81ebce5c23df // indirect
 )

programming_language: Go
filename: go.sum
change_type: ModificationType.MODIFY
diff: @@ -32,8 +32,8 @@ github.com/go-sql-driver/mysql v1.5.0/go.mod h1:DCzpHaOWr8IXmIStZouvnhqoel9Qv2LB
 github.com/golang-sql/civil v0.0.0-20190719163853-cb61b32ac6fe h1:lXe2qZdvpiX5WZkZR4hgp4KJVfY3nMkvmwbVkpv1rVY=
 github.com/golang-sql/civil v0.0.0-20190719163853-cb61b32ac6fe/go.mod h1:8vg3r2VgvsThLBIFL93Qb5yWzgyZWhEmBwUJWevAkK0=
 github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
-github.com/gophish/gomail v0.0.0-20180314010319-cf7e1a5479be h1:VTe1cdyqSi/wLowKNz/shz6E0G+9/XzldZbyAmt+0Yw=
-github.com/gophish/gomail v0.0.0-20180314010319-cf7e1a5479be/go.mod h1:MpSuP7kw+gRy2z+4gIFZeF3DwhhdQhEXwRmPVQYD9ig=
+github.com/gophish/gomail v0.0.0-20200818021916-1f6d0dfd512e h1:URNpXdOxXAfuZ8wsr/DY27KTffVenKDjtNVAEwcR2Oo=
+github.com/gophish/gomail v0.0.0-20200818021916-1f6d0dfd512e/go.mod h1:JGlHttcLdDp3F4g8bPHqqQnUUDuB3poB4zLXozQ0xCY=
 github.com/gorilla/context v1.1.1 h1:AWwleXJkX/nhcU9bZSnZoi3h/qGYqQAGhq6zZe/aQW8=
 github.com/gorilla/context v1.1.1/go.mod h1:kBGZzfjB9CEq2AlWe17Uuf7NDRt0dE0s8S51q0aT7Yg=
 github.com/gorilla/csrf v1.6.2 h1:QqQ/OWwuFp4jMKgBFAzJVW3FMULdyUW7JoM4pEWuqKg=
@@ -110,7 +110,5 @@ gopkg.in/alexcesaro/quotedprintable.v3 v3.0.0-20150716171945-2caba252f4dc h1:2gG
 gopkg.in/alexcesaro/quotedprintable.v3 v3.0.0-20150716171945-2caba252f4dc/go.mod h1:m7x9LTH6d71AHyAX77c9yqWCCa3UKHcVEj9y7hAtKDk=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/gomail.v2 v2.0.0-20160411212932-81ebce5c23df h1:n7WqCuqOuCbNr617RXOY0AWRXxgwEyPp2z+p0+hgMuE=
-gopkg.in/gomail.v2 v2.0.0-20160411212932-81ebce5c23df/go.mod h1:LRQQ+SO6ZHR7tOkpBDuZnXENFzX8qRjMDMyPD6BRkCw=
 gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

programming_language: Go
filename: gophish.go
change_type: ModificationType.MODIFY
diff: @@ -28,6 +28,7 @@ THE SOFTWARE.
 import (
 	"fmt"
 	"io/ioutil"
+	"net/http"
 	"os"
 	"os/signal"
 
@@ -35,10 +36,12 @@ import (
 
 	"github.com/gophish/gophish/config"
 	"github.com/gophish/gophish/controllers"
+	"github.com/gophish/gophish/dialer"
 	"github.com/gophish/gophish/imap"
 	log "github.com/gophish/gophish/logger"
 	"github.com/gophish/gophish/middleware"
 	"github.com/gophish/gophish/models"
+	"github.com/gophish/gophish/webhook"
 )
 
 const (
@@ -79,6 +82,13 @@ func main() {
 	}
 	config.Version = string(version)
 
+	// Configure our various upstream clients to make sure that we restrict
+	// outbound connections as needed.
+	dialer.SetAllowedHosts(conf.AdminConf.AllowedInternalHosts)
+	webhook.SetTransport(&http.Transport{
+		DialContext: dialer.Dialer().DialContext,
+	})
+
 	err = log.Setup(conf.Logging)
 	if err != nil {
 		log.Fatal(err)

programming_language: Go
filename: imap.go
change_type: ModificationType.MODIFY
diff: @@ -11,6 +11,7 @@ import (
 	"github.com/emersion/go-imap"
 	"github.com/emersion/go-imap/client"
 	"github.com/emersion/go-message/charset"
+	"github.com/gophish/gophish/dialer"
 	log "github.com/gophish/gophish/logger"
 	"github.com/gophish/gophish/models"
 
@@ -184,12 +185,13 @@ func (mbox *Mailbox) GetUnread(markAsRead, delete bool) ([]Email, error) {
 func (mbox *Mailbox) newClient() (*client.Client, error) {
 	var imapClient *client.Client
 	var err error
+	restrictedDialer := dialer.Dialer()
 	if mbox.TLS {
 		config := new(tls.Config)
 		config.InsecureSkipVerify = mbox.IgnoreCertErrors
-		imapClient, err = client.DialTLS(mbox.Host, config)
+		imapClient, err = client.DialWithDialerTLS(restrictedDialer, mbox.Host, config)
 	} else {
-		imapClient, err = client.Dial(mbox.Host)
+		imapClient, err = client.DialWithDialer(restrictedDialer, mbox.Host)
 	}
 	if err != nil {
 		return imapClient, err

programming_language: Go
filename: smtp.go
change_type: ModificationType.MODIFY
diff: @@ -10,6 +10,7 @@ import (
 	"time"
 
 	"github.com/gophish/gomail"
+	"github.com/gophish/gophish/dialer"
 	log "github.com/gophish/gophish/logger"
 	"github.com/gophish/gophish/mailer"
 	"github.com/jinzhu/gorm"
@@ -109,7 +110,8 @@ func (s *SMTP) GetDialer() (mailer.Dialer, error) {
 		log.Error(err)
 		return nil, err
 	}
-	d := gomail.NewDialer(host, port, s.Username, s.Password)
+	dialer := dialer.Dialer()
+	d := gomail.NewWithDialer(dialer, host, port, s.Username, s.Password)
 	d.TLSConfig = &tls.Config{
 		ServerName:         host,
 		InsecureSkipVerify: s.IgnoreCertErrors,

programming_language: Go
filename: smtp_test.go
change_type: ModificationType.MODIFY
diff: @@ -81,3 +81,15 @@ func (s *ModelsSuite) TestGetInvalidSMTP(ch *check.C) {
 	_, err := GetSMTP(-1, 1)
 	ch.Assert(err, check.Equals, gorm.ErrRecordNotFound)
 }
+
+func (s *ModelsSuite) TestDefaultDeniedDial(ch *check.C) {
+	host := "169.254.169.254"
+	port := 25
+	smtp := SMTP{
+		Host: fmt.Sprintf("%s:%d", host, port),
+	}
+	d, err := smtp.GetDialer()
+	ch.Assert(err, check.Equals, nil)
+	_, err = d.Dial()
+	ch.Assert(err, check.ErrorMatches, ".*upstream connection denied.*")
+}

programming_language: Go
filename: webhook.go
change_type: ModificationType.MODIFY
diff: @@ -51,6 +51,11 @@ var senderInstance = &defaultSender{
 	},
 }
 
+// SetTransport sets the underlying transport for the default webhook client.
+func SetTransport(tr *http.Transport) {
+	senderInstance.client.Transport = tr
+}
+
 // EndPoint represents a URL to send the webhook to, as well as a secret used
 // to sign the event
 type EndPoint struct {

programming_language: Go