AWS backend: Add user_path option for role.

builtin/logical/aws/backend_test.go

@@ -7,6 +7,7 @@ import (
 	"net/http"
 	"os"
 	"reflect"
+	"strings"
 	"sync"
 	"testing"
 	"time"
@@ -556,6 +557,27 @@ func describeAzsTestUnauthorized(accessKey, secretKey, token string) error {
 	})
 }
 
+func assertCreatedIAMUser(accessKey, secretKey, token string) error {
+	creds := credentials.NewStaticCredentials(accessKey, secretKey, token)
+	awsConfig := &aws.Config{
+		Credentials: creds,
+		Region:      aws.String("us-east-1"),
+		HTTPClient:  cleanhttp.DefaultClient(),
+	}
+	client := iam.New(session.New(awsConfig))
+	log.Printf("[WARN] Checking if IAM User is created properly...")
+	userOutput, err := client.GetUser(&iam.GetUserInput{})
+	if err != nil {
+		return err
+	}
+
+	if *userOutput.User.Path != "/path/" {
+		return fmt.Errorf("bad: got: %#v\nexpected: %#v", userOutput.User.Path, "/path/")
+	}
+
+	return nil
+}
+
 func listIamUsersTest(accessKey, secretKey, token string) error {
 	creds := credentials.NewStaticCredentials(accessKey, secretKey, token)
 	awsConfig := &aws.Config{
@@ -650,9 +672,10 @@ func testAccStepReadPolicy(t *testing.T, name string, value string) logicaltest.
 				"policy_arns":     []string(nil),
 				"role_arns":       []string(nil),
 				"policy_document": value,
-				"credential_types": []string{iamUserCred, federationTokenCred},
+				"credential_type": strings.Join([]string{iamUserCred, federationTokenCred}, ","),
 				"default_sts_ttl": int64(0),
 				"max_sts_ttl":     int64(0),
+				"user_path":       "",
 			}
 			if !reflect.DeepEqual(resp.Data, expected) {
 				return fmt.Errorf("bad: got: %#v\nexpected: %#v", resp.Data, expected)
@@ -743,15 +766,18 @@ func TestBackend_iamUserManagedInlinePolicies(t *testing.T) {
 		"policy_document": testDynamoPolicy,
 		"policy_arns":     []string{ec2PolicyArn, iamPolicyArn},
 		"credential_type": iamUserCred,
+		"user_path":       "/path/",
 	}
 	expectedRoleData := map[string]interface{}{
 		"policy_document": compacted,
 		"policy_arns":     []string{ec2PolicyArn, iamPolicyArn},
-		"credential_types": []string{iamUserCred},
+		"credential_type": iamUserCred,
 		"role_arns":       []string(nil),
 		"default_sts_ttl": int64(0),
 		"max_sts_ttl":     int64(0),
+		"user_path":       "/path/",
 	}
+
 	logicaltest.Test(t, logicaltest.TestCase{
 		AcceptanceTest: true,
 		PreCheck:       func() { testAccPreCheck(t) },
@@ -760,7 +786,7 @@ func TestBackend_iamUserManagedInlinePolicies(t *testing.T) {
 			testAccStepConfig(t),
 			testAccStepWriteRole(t, "test", roleData),
 			testAccStepReadRole(t, "test", expectedRoleData),
-			testAccStepRead(t, "creds", "test", []credentialTestFunc{describeInstancesTest, listIamUsersTest, listDynamoTablesTest}),
+			testAccStepRead(t, "creds", "test", []credentialTestFunc{describeInstancesTest, listIamUsersTest, listDynamoTablesTest, assertCreatedIAMUser}),
 			testAccStepRead(t, "sts", "test", []credentialTestFunc{describeInstancesTest, listIamUsersTest, listDynamoTablesTest}),
 		},
 	})
@@ -884,9 +910,10 @@ func testAccStepReadArnPolicy(t *testing.T, name string, value string) logicalte
 				"policy_arns":     []string{value},
 				"role_arns":       []string(nil),
 				"policy_document": "",
-				"credential_types": []string{iamUserCred},
+				"credential_type": iamUserCred,
 				"default_sts_ttl": int64(0),
 				"max_sts_ttl":     int64(0),
+				"user_path":       "",
 			}
 			if !reflect.DeepEqual(resp.Data, expected) {
 				return fmt.Errorf("bad: got: %#v\nexpected: %#v", resp.Data, expected)

builtin/logical/aws/path_roles.go

@@ -6,6 +6,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"regexp"
 	"strings"
 	"time"
 
@@ -16,6 +17,10 @@ import (
 	"github.com/hashicorp/vault/logical/framework"
 )
 
+var (
+	userPathRegex = regexp.MustCompile(`^\/([\x21-\x7F]{0,510}\/)?$`)
+)
+
 func pathListRoles(b *backend) *framework.Path {
 	return &framework.Path{
 		Pattern: "roles/?$",
@@ -89,6 +94,13 @@ or IAM role to assume`,
 				Description: "Deprecated; use policy_document instead. IAM policy document",
 				Deprecated:  true,
 			},
+
+			"user_path": &framework.FieldSchema{
+				Type:        framework.TypeString,
+				Description: "Path for IAM User. Only valid when credential_type is " + iamUserCred,
+				DisplayName: "User Path",
+				Default:     "/",
+			},
 		},
 
 		Callbacks: map[logical.Operation]framework.OperationFunc{
@@ -245,6 +257,20 @@ func (b *backend) pathRolesWrite(ctx context.Context, req *logical.Request, d *f
 		roleEntry.MaxSTSTTL = time.Duration(maxSTSTTLRaw.(int)) * time.Second
 	}
 
+	if userPathRaw, ok := d.GetOk("user_path"); ok {
+		if legacyRole != "" {
+			return logical.ErrorResponse("cannot supply deprecated role or policy parameters with user_path"), nil
+		}
+		if !strutil.StrListContains(roleEntry.CredentialTypes, iamUserCred) {
+			return logical.ErrorResponse(fmt.Sprintf("user_path parameter only valid for %s credential type", iamUserCred)), nil
+		}
+		if !userPathRegex.MatchString(userPathRaw.(string)) {
+			return logical.ErrorResponse(fmt.Sprintf("The specified value for user_path is invalid. It must match '%s' regexp", userPathRegex.String())), nil
+		}
+
+		roleEntry.UserPath = userPathRaw.(string)
+	}
+
 	if roleEntry.MaxSTSTTL > 0 &&
 		roleEntry.DefaultSTSTTL > 0 &&
 		roleEntry.DefaultSTSTTL > roleEntry.MaxSTSTTL {
@@ -432,6 +458,7 @@ type awsRoleEntry struct {
 	Version                  int           `json:"version"`                               // Version number of the role format
 	DefaultSTSTTL            time.Duration `json:"default_sts_ttl"`                       // Default TTL for STS credentials
 	MaxSTSTTL                time.Duration `json:"max_sts_ttl"`                           // Max allowed TTL for STS credentials
+	UserPath                 string        `json:"user_path"`                             // The path for the IAM user when using "iam_user" credential type
 }
 
 func (r *awsRoleEntry) toResponseData() map[string]interface{} {
@@ -442,7 +469,9 @@ func (r *awsRoleEntry) toResponseData() map[string]interface{} {
 		"policy_document": r.PolicyDocument,
 		"default_sts_ttl": int64(r.DefaultSTSTTL.Seconds()),
 		"max_sts_ttl":     int64(r.MaxSTSTTL.Seconds()),
+		"user_path":       r.UserPath,
 	}
+
 	if r.InvalidData != "" {
 		respData["invalid_data"] = r.InvalidData
 	}

builtin/logical/aws/path_roles_test.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"reflect"
 	"strconv"
+	"strings"
 	"testing"
 
 	"github.com/hashicorp/vault/logical"
@@ -154,3 +155,61 @@ func TestUpgradeLegacyPolicyEntry(t *testing.T) {
 		t.Fatalf("bad: expected %#v; received %#v", expected, *output)
 	}
 }
+
+func TestUserPathValidity(t *testing.T) {
+
+	testCases := []struct {
+		description string
+		userPath    string
+		isValid     bool
+	}{
+		{
+			description: "Default",
+			userPath:    "/",
+			isValid:     true,
+		},
+		{
+			description: "Empty",
+			userPath:    "",
+			isValid:     false,
+		},
+		{
+			description: "Valid",
+			userPath:    "/path/",
+			isValid:     true,
+		},
+		{
+			description: "Missing leading slash",
+			userPath:    "path/",
+			isValid:     false,
+		},
+		{
+			description: "Missing trailing slash",
+			userPath:    "/path",
+			isValid:     false,
+		},
+		{
+			description: "Invalid character",
+			userPath:    "/šiauliai/",
+			isValid:     false,
+		},
+		{
+			description: "Max length",
+			userPath:    "/" + strings.Repeat("a", 510) + "/",
+			isValid:     true,
+		},
+		{
+			description: "Too long",
+			userPath:    "/" + strings.Repeat("a", 511) + "/",
+			isValid:     false,
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.description, func(t *testing.T) {
+			if tc.isValid != userPathRegex.MatchString(tc.userPath) {
+				t.Fatalf("bad: expected %s", strconv.FormatBool(tc.isValid))
+			}
+		})
+	}
+}

builtin/logical/aws/secret_access_keys.go

@@ -180,9 +180,15 @@ func (b *backend) secretAccessKeysCreate(
 		return nil, errwrap.Wrapf("error writing WAL entry: {{err}}", err)
 	}
 
+	userPath := role.UserPath
+	if userPath == "" {
+		userPath = "/"
+	}
+
 	// Create the user
 	_, err = iamClient.CreateUser(&iam.CreateUserInput{
 		UserName: aws.String(username),
+		Path:     aws.String(userPath),
 	})
 	if err != nil {
 		if walErr := framework.DeleteWAL(ctx, s, walID); walErr != nil {

website/source/api/secret/aws/index.html.md

@@ -230,6 +230,9 @@ updated with the new attributes.
   TTL are capped to `max_sts_ttl`). Valid only when `credential_type` is one of 
   `assumed_role` or `federation_token`.
 
+- `user_path` `(string)` - The path for the user name. Valid only when
+  `credential_type` is `iam_user`. Default is `/`
+
 Legacy parameters:
 
 These parameters are supported for backwards compatibility only. They cannot be