/
query_permissions.go
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/
query_permissions.go
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// Copyright 2021 Workrise Technologies Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package eiam
import (
"bytes"
"fmt"
"io"
"os"
"os/exec"
"text/tabwriter"
"github.com/fatih/color"
"github.com/lithammer/dedent"
"github.com/spf13/cobra"
"github.com/rigup/ephemeral-iam/internal/appconfig"
util "github.com/rigup/ephemeral-iam/internal/eiamutil"
errorsutil "github.com/rigup/ephemeral-iam/internal/errors"
"github.com/rigup/ephemeral-iam/internal/gcpclient"
queryiam "github.com/rigup/ephemeral-iam/internal/gcpclient/query_iam"
"github.com/rigup/ephemeral-iam/pkg/options"
)
// Resource string templates.
var (
computeInstanceRes = "//compute.googleapis.com/projects/%s/zones/%s/instances/%s"
projectsRes = "//cloudresourcemanager.googleapis.com/projects/%s"
pubsubTopicsRes = "//pubsub.googleapis.com/projects/%s/topics/%s"
serviceAccountsRes = "//iam.googleapis.com/projects/%s/serviceAccounts/%s"
storageBucketsRes = "//storage.googleapis.com/projects/_/buckets/%s"
green = color.New(color.FgGreen).SprintFunc()
red = color.New(color.FgRed).SprintFunc()
)
var queryPermsCmdConfig options.CmdConfig
func newCmdQueryPermissions() *cobra.Command {
cmd := &cobra.Command{
Use: "query-permissions",
Short: "Query current permissions on a GCP resource",
Long: dedent.Dedent(`
Compare the list of permissions granted on a resource against the full list of
grantable permissions.
For example, the list of grantable permissions on a Cloud PubSub Topic are as follows:
pubsub.topics.attachSubscription
pubsub.topics.delete
pubsub.topics.detachSubscription
pubsub.topics.get
pubsub.topics.getIamPolicy
pubsub.topics.publish
pubsub.topics.setIamPolicy
pubsub.topics.update
pubsub.topics.updateTag
Say a user (user1) is granted the PubSub Viewer role on a topic (topic1). The PubSub Viewer role grants the
"pubsub.topics.get" permissions on Topics.
$ eiam query-permissions pubsub -t topic1
AVAILABLE GRANTED
pubsub.topics.attachSubscription ✖
pubsub.topics.delete ✖
pubsub.topics.detachSubscription ✖
pubsub.topics.get ✔
pubsub.topics.getIamPolicy ✖
pubsub.topics.publish ✖
pubsub.topics.setIamPolicy ✖
pubsub.topics.update ✖
pubsub.topics.updateTag ✖
If user1 can assume the privileges of a service account (sa1), they can query the permissions that sa1
has on the topic. Say sa1 has been granted the PubSub Admin role on topic1:
$ eiam query-permissions pubsub -t topic1 -s sa1@project.iam.gserviceaccount.com
AVAILABLE GRANTED
pubsub.topics.attachSubscription ✔
pubsub.topics.delete ✔
pubsub.topics.detachSubscription ✔
pubsub.topics.get ✔
pubsub.topics.getIamPolicy ✔
pubsub.topics.publish ✔
pubsub.topics.setIamPolicy ✔
pubsub.topics.update ✔
pubsub.topics.updateTag ✔
INFO sa1@project.iam.gserviceaccount.com has full access to this resource
`),
}
cmd.AddCommand(newCmdQueryComputeInstancePermissions())
cmd.AddCommand(newCmdQueryProjectPermissions())
cmd.AddCommand(newCmdQueryPubSubPermissions())
cmd.AddCommand(newCmdQueryServiceAccountPermissions())
cmd.AddCommand(newCmdQueryStorageBucketPermissions())
return cmd
}
func newCmdQueryComputeInstancePermissions() *cobra.Command {
var resourceString string
cmd := &cobra.Command{
Use: "compute-instance",
Short: "Query the permissions you are granted on a compute instance",
Example: dedent.Dedent(`
eiam query-permissions compute-instance \
--zone us-central1-a --instance my-instance
eiam query-permissions compute-instance \
--zone us-central1-a --instance my-instance \
--service-account-email example@my-project.iam.gserviceaccount.com
`),
PreRunE: func(cmd *cobra.Command, args []string) error {
if err := options.CheckRequired(cmd.Flags()); err != nil {
return err
}
resourceString = fmt.Sprintf(
computeInstanceRes,
queryPermsCmdConfig.Project,
queryPermsCmdConfig.Zone,
queryPermsCmdConfig.ComputeInstance,
)
return nil
},
RunE: func(cmd *cobra.Command, args []string) error {
util.Logger.Infof("Querying permissions granted on %s", resourceString)
testablePerms, err := queryiam.QueryTestablePermissionsOnResource(resourceString)
if err != nil {
msg := fmt.Sprintf("gcloud is configured to use %s as the default zone", queryPermsCmdConfig.Zone)
return errorsutil.New(msg, err)
}
userPerms, err := queryiam.QueryComputeInstancePermissions(
testablePerms,
queryPermsCmdConfig.Project,
queryPermsCmdConfig.Zone,
queryPermsCmdConfig.ComputeInstance,
queryPermsCmdConfig.ServiceAccountEmail,
queryPermsCmdConfig.Reason,
)
if err != nil {
return err
}
if queryPermsCmdConfig.ServiceAccountEmail != "" {
return printPermissions(util.Uniq(testablePerms), userPerms, queryPermsCmdConfig.ServiceAccountEmail)
}
userAcct, err := gcpclient.CheckActiveAccountSet()
if err != nil {
return err
}
return printPermissions(util.Uniq(testablePerms), userPerms, userAcct)
},
}
options.AddProjectFlag(cmd.Flags(), &queryPermsCmdConfig.Project, false)
options.AddZoneFlag(cmd.Flags(), &queryPermsCmdConfig.Zone, true)
options.AddComputeInstanceFlag(cmd.Flags(), &queryPermsCmdConfig.ComputeInstance, true)
options.AddServiceAccountEmailFlag(cmd.Flags(), &queryPermsCmdConfig.ServiceAccountEmail, false)
options.AddReasonFlag(cmd.Flags(), &queryPermsCmdConfig.Reason, false)
return cmd
}
func newCmdQueryProjectPermissions() *cobra.Command {
var resourceString string
cmd := &cobra.Command{
Use: "project",
Short: "Query the permissions you are granted at the project level",
Example: " eiam query-permissions project",
PreRun: func(cmd *cobra.Command, args []string) {
resourceString = fmt.Sprintf(projectsRes, queryPermsCmdConfig.Project)
},
RunE: func(cmd *cobra.Command, args []string) error {
util.Logger.Infof("Querying permissions granted on %s", resourceString)
testablePerms, err := queryiam.QueryTestablePermissionsOnResource(resourceString)
if err != nil {
return err
}
userPerms, err := queryiam.QueryProjectPermissions(
testablePerms,
queryPermsCmdConfig.Project,
queryPermsCmdConfig.ServiceAccountEmail,
queryPermsCmdConfig.Reason,
)
if err != nil {
return err
}
if queryPermsCmdConfig.ServiceAccountEmail != "" {
return printPermissions(util.Uniq(testablePerms), userPerms, queryPermsCmdConfig.ServiceAccountEmail)
}
userAcct, err := gcpclient.CheckActiveAccountSet()
if err != nil {
return err
}
return printPermissions(util.Uniq(testablePerms), userPerms, userAcct)
},
}
options.AddProjectFlag(cmd.Flags(), &queryPermsCmdConfig.Project, false)
options.AddServiceAccountEmailFlag(cmd.Flags(), &queryPermsCmdConfig.ServiceAccountEmail, false)
options.AddReasonFlag(cmd.Flags(), &queryPermsCmdConfig.Reason, false)
return cmd
}
func newCmdQueryPubSubPermissions() *cobra.Command {
var resourceString string
cmd := &cobra.Command{
Use: "pubsub",
Short: "Query the permissions you are granted on a pubsub topic",
Example: dedent.Dedent(`
eiam query-permissions pubsub -t topic1
eiam query-permissions pubsub -t topic1 \
--service-account-email example@my-project.iam.gserviceaccount.com
`),
PreRunE: func(cmd *cobra.Command, args []string) error {
if err := options.CheckRequired(cmd.Flags()); err != nil {
return err
}
resourceString = fmt.Sprintf(pubsubTopicsRes, queryPermsCmdConfig.Project, queryPermsCmdConfig.PubSubTopic)
return nil
},
RunE: func(cmd *cobra.Command, args []string) error {
util.Logger.Infof("Querying permissions granted on %s", resourceString)
testablePerms, err := queryiam.QueryTestablePermissionsOnResource(resourceString)
if err != nil {
return err
}
userPerms, err := queryiam.QueryPubSubPermissions(
testablePerms,
queryPermsCmdConfig.Project,
queryPermsCmdConfig.PubSubTopic,
queryPermsCmdConfig.ServiceAccountEmail,
queryPermsCmdConfig.Reason,
)
if err != nil {
return err
}
if queryPermsCmdConfig.ServiceAccountEmail != "" {
return printPermissions(util.Uniq(testablePerms), userPerms, queryPermsCmdConfig.ServiceAccountEmail)
}
userAcct, err := gcpclient.CheckActiveAccountSet()
if err != nil {
return err
}
return printPermissions(util.Uniq(testablePerms), userPerms, userAcct)
},
}
options.AddProjectFlag(cmd.Flags(), &queryPermsCmdConfig.Project, false)
options.AddPubSubTopicFlag(cmd.Flags(), &queryPermsCmdConfig.PubSubTopic, true)
options.AddServiceAccountEmailFlag(cmd.Flags(), &queryPermsCmdConfig.ServiceAccountEmail, false)
options.AddReasonFlag(cmd.Flags(), &queryPermsCmdConfig.Reason, false)
return cmd
}
func newCmdQueryServiceAccountPermissions() *cobra.Command {
var resourceString string
cmd := &cobra.Command{
Use: "service-account",
Short: "Query the permissions you are granted on a service account",
Example: dedent.Dedent(`
eiam query-permissions service-account \
--service-account-email example@my-project.iam.gserviceaccount.com
`),
PreRunE: func(cmd *cobra.Command, args []string) error {
if err := options.CheckRequired(cmd.Flags()); err != nil {
return err
}
resourceString = fmt.Sprintf(
serviceAccountsRes,
queryPermsCmdConfig.Project,
queryPermsCmdConfig.ServiceAccountEmail,
)
return nil
},
RunE: func(cmd *cobra.Command, args []string) error {
util.Logger.Infof("Querying permissions granted on %s", resourceString)
testablePerms, err := queryiam.QueryTestablePermissionsOnResource(resourceString)
if err != nil {
return err
}
userPerms, err := queryiam.QueryServiceAccountPermissions(
testablePerms,
queryPermsCmdConfig.Project,
queryPermsCmdConfig.ServiceAccountEmail,
)
if err != nil {
return err
}
if queryPermsCmdConfig.ServiceAccountEmail != "" {
return printPermissions(util.Uniq(testablePerms), userPerms, queryPermsCmdConfig.ServiceAccountEmail)
}
userAcct, err := gcpclient.CheckActiveAccountSet()
if err != nil {
return err
}
return printPermissions(util.Uniq(testablePerms), userPerms, userAcct)
},
}
options.AddServiceAccountEmailFlag(cmd.Flags(), &queryPermsCmdConfig.ServiceAccountEmail, true)
options.AddProjectFlag(cmd.Flags(), &queryPermsCmdConfig.Project, false)
return cmd
}
func newCmdQueryStorageBucketPermissions() *cobra.Command {
var resourceString string
cmd := &cobra.Command{
Use: "storage-bucket",
Short: "Query the permissions you are granted on a storage bucket",
Example: dedent.Dedent(`
eiam query-permissions storage-bucket --bucket bucket-name
eiam query-permissions storage-bucket --bucket bucket-name \
--service-account-email example@my-project.iam.gserviceaccount.com
`),
PreRunE: func(cmd *cobra.Command, args []string) error {
if err := options.CheckRequired(cmd.Flags()); err != nil {
return err
}
resourceString = fmt.Sprintf(storageBucketsRes, queryPermsCmdConfig.StorageBucket)
return nil
},
RunE: func(cmd *cobra.Command, args []string) error {
util.Logger.Infof("Querying permissions granted on %s", resourceString)
testablePerms, err := queryiam.QueryTestablePermissionsOnResource(resourceString)
if err != nil {
return err
}
userPerms, err := queryiam.QueryStorageBucketPermissions(
testablePerms,
queryPermsCmdConfig.StorageBucket,
queryPermsCmdConfig.ServiceAccountEmail,
queryPermsCmdConfig.Reason,
)
if err != nil {
return err
}
if queryPermsCmdConfig.ServiceAccountEmail != "" {
return printPermissions(util.Uniq(testablePerms), userPerms, queryPermsCmdConfig.ServiceAccountEmail)
}
userAcct, err := gcpclient.CheckActiveAccountSet()
if err != nil {
return err
}
return printPermissions(util.Uniq(testablePerms), userPerms, userAcct)
},
}
options.AddStorageBucketFlag(cmd.Flags(), &queryPermsCmdConfig.StorageBucket, true)
options.AddServiceAccountEmailFlag(cmd.Flags(), &queryPermsCmdConfig.ServiceAccountEmail, false)
options.AddReasonFlag(cmd.Flags(), &queryPermsCmdConfig.Reason, false)
return cmd
}
func printPermissions(fullPerms, userPerms []string, acctEmail string) error {
userPermsMap := makePermsMap(userPerms)
if len(fullPerms) > 100 {
// If the list of permissions is really long and the user has the less command
// available, pipe the command to less to paginate the output.
lessPath, err := appconfig.CheckCommandExists("less")
if err != nil {
printPermissionsList(os.Stderr, fullPerms, userPermsMap, acctEmail, true)
}
// Create command for less with a stdin pipe that we can write to.
cmd := exec.Command(lessPath)
cmd.Stdout = os.Stdout
stdin, err := cmd.StdinPipe()
if err != nil {
return errorsutil.New("Failed to create stdin pipe for less command", err)
}
// Write the output in a goroutine so less can be ready to read it.
go func() {
defer stdin.Close()
printPermissionsList(stdin, fullPerms, userPermsMap, acctEmail, false)
}()
if err := cmd.Run(); err != nil {
printPermissionsList(os.Stderr, fullPerms, userPermsMap, acctEmail, true)
}
} else {
printPermissionsList(os.Stderr, fullPerms, userPermsMap, acctEmail, true)
}
return nil
}
func printPermissionsList(out io.Writer, fullPerms []string, userPerms map[string]bool, acct string, colorOutput bool) {
yes, no := "✔", "✖"
if colorOutput {
yes, no = green(yes), red(no)
}
var buf bytes.Buffer
w := tabwriter.NewWriter(&buf, 0, 4, 4, ' ', 0)
fmt.Fprintln(w, "AVAILABLE\tGRANTED")
for _, perm := range fullPerms {
if _, ok := userPerms[perm]; ok {
fmt.Fprintf(w, "%s\t%s\n", perm, yes)
} else {
fmt.Fprintf(w, "%s\t%s\n", perm, no)
}
}
w.Flush()
fmt.Fprintf(out, "\n%s\n\n", buf.String())
fmt.Println()
if len(userPerms) == 0 {
util.Logger.Warnf("%s does not have any access to this resource", acct)
} else if len(userPerms) == len(fullPerms) {
util.Logger.Infof("%s has full access to this resource", acct)
}
}
func makePermsMap(perms []string) map[string]bool {
m := make(map[string]bool, len(perms))
for _, perm := range perms {
m[perm] = true
}
return m
}