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permissions.go
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permissions.go
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package aws
import (
"context"
"encoding/json"
"errors"
"fmt"
"net/url"
"path/filepath"
"strconv"
"time"
"github.com/BishopFox/cloudfox/console"
"github.com/BishopFox/cloudfox/utils"
"github.com/aws/aws-sdk-go-v2/aws"
"github.com/aws/aws-sdk-go-v2/service/iam"
"github.com/aws/aws-sdk-go-v2/service/iam/types"
"github.com/aws/aws-sdk-go-v2/service/sts"
"github.com/sirupsen/logrus"
)
type IamPermissionsModule struct {
// General configuration data
IAMClient *iam.Client
Caller sts.GetCallerIdentityOutput
AWSRegions []string
OutputFormat string
AWSProfile string
// Main module data
Policies []GAADPolicy
Users []GAADUser
Roles []GAADRole
Groups []GAADGroup
Rows []PermissionsRow
CommandCounter console.CommandCounter
// Used to store output data for pretty printing
output utils.OutputData2
modLog *logrus.Entry
}
type GAADPolicy struct {
Name string
Arn string
PolicyVersionList []types.PolicyVersion
}
type GAADUser struct {
Name string
Arn string
AttachedPolicies []types.AttachedPolicy
InlinePolicies []types.PolicyDetail
GroupList []string
}
type GAADRole struct {
Arn string
Name string
AttachedPolicies []types.AttachedPolicy
InlinePolicies []types.PolicyDetail
}
type GAADGroup struct {
Arn string
Name string
AttachedPolicies []types.AttachedPolicy
InlinePolicies []types.PolicyDetail
}
type PermissionsRow struct {
AWSService string
Type string
Name string
Arn string
PolicyType string
PolicyName string
Effect string
Action string
Resource string
}
func (m *IamPermissionsModule) PrintIamPermissions(outputFormat string, outputDirectory string, verbosity int, principal string) {
// These stuct values are used by the output module
m.output.Verbosity = verbosity
m.output.Directory = outputDirectory
m.output.CallingModule = "permissions"
m.output.FullFilename = m.output.CallingModule
m.modLog = utils.TxtLogger.WithFields(logrus.Fields{
"module": m.output.CallingModule,
})
if m.AWSProfile == "" {
m.AWSProfile = fmt.Sprintf("%s-%s", aws.ToString(m.Caller.Account), aws.ToString(m.Caller.UserId))
}
m.output.FilePath = filepath.Join(outputDirectory, "cloudfox-output", "aws", m.AWSProfile)
fmt.Printf("[%s] Enumerating IAM permissions for account %s.\n", cyan(m.output.CallingModule), aws.ToString(m.Caller.Account))
if principal != "" {
m.output.FullFilename = filepath.Join(fmt.Sprintf("%s-custom-%s", m.output.CallingModule, strconv.FormatInt((time.Now().Unix()), 10)))
}
m.getGAAD(principal)
m.parsePermissions()
m.output.Headers = []string{
"Service",
"Principal Type",
"Name",
//"Arn",
"Policy Type",
"Policy Name",
"Effect",
"Action",
"Resource",
}
//Table rows
for i := range m.Rows {
m.output.Body = append(
m.output.Body,
[]string{
m.Rows[i].AWSService,
m.Rows[i].Type,
m.Rows[i].Name,
//m.Rows[i].Arn,
m.Rows[i].PolicyType,
m.Rows[i].PolicyName,
m.Rows[i].Effect,
m.Rows[i].Action,
m.Rows[i].Resource,
},
)
}
if len(m.output.Body) > 0 {
m.output.FilePath = filepath.Join(outputDirectory, "cloudfox-output", "aws", m.AWSProfile)
//m.output.OutputSelector3(outputFormat)
utils.OutputSelector(verbosity, outputFormat, m.output.Headers, m.output.Body, m.output.FilePath, m.output.FullFilename, m.output.CallingModule)
fmt.Printf("[%s] %s unique permissions identified.\n", cyan(m.output.CallingModule), strconv.Itoa(len(m.output.Body)))
} else {
fmt.Printf("[%s] No IAM permissions found. skipping the creation of an output file.\n", cyan(m.output.CallingModule))
}
}
func (m *IamPermissionsModule) getGAAD(principal string) {
// "PaginationMarker" is a control variable used for output continuity, as AWS return the output in pages.
var PaginationControl *string
//var totalRoles int
// var attachedPolicies []types.AttachedPolicy
// var inlinePolicies []types.PolicyDetail
for {
GAAD, err := m.IAMClient.GetAccountAuthorizationDetails(
context.TODO(),
&iam.GetAccountAuthorizationDetailsInput{
Marker: PaginationControl,
},
)
if err != nil {
m.modLog.Error(err.Error())
m.CommandCounter.Error++
break
}
for _, policy := range GAAD.Policies {
//var IAMtype = "Role"
arn := aws.ToString(policy.Arn)
name := aws.ToString(policy.PolicyName)
m.Policies = append(m.Policies, GAADPolicy{
Arn: arn,
Name: name,
PolicyVersionList: policy.PolicyVersionList,
})
}
for _, role := range GAAD.RoleDetailList {
arn := aws.ToString(role.Arn)
name := aws.ToString(role.RoleName)
if principal == "" {
m.Roles = append(m.Roles, GAADRole{
Arn: arn,
Name: name,
AttachedPolicies: role.AttachedManagedPolicies,
InlinePolicies: role.RolePolicyList,
})
} else {
if arn == principal {
m.Roles = append(m.Roles, GAADRole{
Arn: arn,
Name: name,
AttachedPolicies: role.AttachedManagedPolicies,
InlinePolicies: role.RolePolicyList,
})
}
}
}
// i think the error here is pagination!!
for _, user := range GAAD.UserDetailList {
//var IAMtype = "User"
arn := aws.ToString(user.Arn)
name := aws.ToString(user.UserName)
groupList := user.GroupList
if principal == "" {
m.Users = append(m.Users, GAADUser{
Arn: arn,
Name: name,
AttachedPolicies: user.AttachedManagedPolicies,
InlinePolicies: user.UserPolicyList,
GroupList: groupList,
})
} else {
if arn == principal {
m.Users = append(m.Users, GAADUser{
Arn: arn,
Name: name,
AttachedPolicies: user.AttachedManagedPolicies,
InlinePolicies: user.UserPolicyList,
GroupList: groupList,
})
}
}
}
for _, group := range GAAD.GroupDetailList {
arn := aws.ToString(group.Arn)
name := aws.ToString(group.GroupName)
if principal == "" {
m.Groups = append(m.Groups, GAADGroup{
Arn: arn,
Name: name,
AttachedPolicies: group.AttachedManagedPolicies,
InlinePolicies: group.GroupPolicyList,
})
} else {
if arn == principal {
m.Groups = append(m.Groups, GAADGroup{
Arn: arn,
Name: name,
AttachedPolicies: group.AttachedManagedPolicies,
InlinePolicies: group.GroupPolicyList,
})
}
}
}
// Pagination control. After the last page of output, the for loop exits.
if GAAD.Marker != nil {
PaginationControl = GAAD.Marker
} else {
PaginationControl = nil
break
}
}
}
func (m *IamPermissionsModule) parsePermissions() {
for i := range m.Roles {
for _, attachedPolicy := range m.Roles[i].AttachedPolicies {
m.getPermissionsFromAttachedPolicy(m.Roles[i].Arn, attachedPolicy, "Role", m.Roles[i].Name)
}
for _, inlinePolicy := range m.Roles[i].InlinePolicies {
m.getPermissionsFromInlinePolicy(m.Roles[i].Arn, inlinePolicy, "Role", m.Roles[i].Name)
}
}
for i := range m.Users {
for _, attachedPolicy := range m.Users[i].AttachedPolicies {
m.getPermissionsFromAttachedPolicy(m.Users[i].Arn, attachedPolicy, "User", m.Users[i].Name)
}
for _, inlinePolicy := range m.Users[i].InlinePolicies {
m.getPermissionsFromInlinePolicy(m.Users[i].Arn, inlinePolicy, "User", m.Users[i].Name)
}
for j, group := range m.Users[i].GroupList {
for _, gaadGroup := range m.Groups {
if gaadGroup.Name == group {
for _, attachedPolicy := range m.Groups[j].AttachedPolicies {
m.getPermissionsFromAttachedPolicy(m.Users[i].Arn, attachedPolicy, "User", m.Users[i].Name)
}
for _, inlinePolicy := range m.Groups[j].InlinePolicies {
m.getPermissionsFromInlinePolicy(m.Users[i].Arn, inlinePolicy, "User", m.Users[i].Name)
}
}
}
}
}
}
func (m *IamPermissionsModule) getPermissionsFromAttachedPolicy(arn string, attachedPolicy types.AttachedPolicy, IAMtype string, name string) {
//var policies []types.ManagedPolicyDetail
var s StatementEntry
var AWSService = "IAM"
for _, p := range m.Policies {
if p.Name == aws.ToString(attachedPolicy.PolicyName) {
for _, d := range p.PolicyVersionList {
if d.IsDefaultVersion {
parsedPolicyDocument, _ := parsePolicyDocument(d.Document)
for _, s = range parsedPolicyDocument.Statement {
//version := parsedPolicyDocument.Version
effect := s.Effect
for _, action := range s.Action {
for _, resource := range s.Resource {
m.Rows = append(
m.Rows,
PermissionsRow{
AWSService: AWSService,
Arn: arn,
Name: name,
Type: IAMtype,
PolicyType: "Managed",
PolicyName: p.Name,
Effect: effect,
Action: action,
Resource: resource,
})
}
}
}
}
}
}
}
}
func (m *IamPermissionsModule) getPermissionsFromInlinePolicy(arn string, inlinePolicy types.PolicyDetail, IAMtype string, name string) {
//var policies []types.ManagedPolicyDetail
var s StatementEntry
var AWSService = "IAM"
parsedPolicyDocument, _ := parsePolicyDocument(inlinePolicy.PolicyDocument)
for _, s = range parsedPolicyDocument.Statement {
//version := parsedPolicyDocument.Version
effect := s.Effect
for _, action := range s.Action {
for _, resource := range s.Resource {
m.Rows = append(
m.Rows,
PermissionsRow{
AWSService: AWSService,
Arn: arn,
Name: name,
Type: IAMtype,
PolicyType: "Inline",
PolicyName: aws.ToString(inlinePolicy.PolicyName),
Effect: effect,
Action: action,
Resource: resource,
})
}
}
}
}
type policyDocument struct {
Version string `json:"Version"`
Statement []StatementEntry `json:"Statement"`
}
type StatementEntry struct {
Effect string `json:"Effect"`
Action ListOfItems `json:"Action"`
Resource ListOfItems `json:"Resource"`
Condition ListOfItems `json:"Condition"`
}
func parsePolicyDocument(doc *string) (policyDocument, error) {
document, _ := url.QueryUnescape(aws.ToString(doc))
var parsedDocumentToJSON policyDocument
_ = json.Unmarshal([]byte(document), &parsedDocumentToJSON)
return parsedDocumentToJSON, nil
}
// A custom unmarshaller is necessary because the list of principals can be an array of strings or a string.
// https://stackoverflow.com/questions/65854778/parsing-arn-from-iam-policy-using-regex
type ListOfItems []string
func (r *ListOfItems) UnmarshalJSON(b []byte) error {
var s string
if err := json.Unmarshal(b, &s); err == nil {
*r = append(*r, s)
return nil
}
var ss []string
if err := json.Unmarshal(b, &ss); err == nil {
*r = ss
return nil
}
return errors.New("cannot unmarshal neither to a string nor a slice of strings")
}