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Add alias types for IAM and GCE logins #89

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merged 5 commits into from
Apr 24, 2020
Merged

Add alias types for IAM and GCE logins #89

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1391e80
Add alias types for IAM and GCE logins
pcman312 Apr 22, 2020
6bb1c8f
Remove commented out code
pcman312 Apr 22, 2020
d0ab734
Removed unused variable
pcman312 Apr 22, 2020
275be17
Minor cleanup
pcman312 Apr 23, 2020
c3ba638
retrieveRole -> role for consistency across plugins
pcman312 Apr 23, 2020
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3 changes: 3 additions & 0 deletions Makefile
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Original file line number Diff line number Diff line change
Expand Up @@ -51,5 +51,8 @@ fmtcheck:
fmt:
gofmt -w $(GOFMT_FILES)

mocks:
mockgen -destination ${CURDIR}/plugin/mocks_test.go -package gcpauth github.com/hashicorp/vault/sdk/logical SystemView,Storage


.PHONY: bin default generate test vet bootstrap fmt fmtcheck
2 changes: 2 additions & 0 deletions go.mod
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Original file line number Diff line number Diff line change
Expand Up @@ -3,10 +3,12 @@ module github.com/hashicorp/vault-plugin-auth-gcp
go 1.12

require (
github.com/golang/mock v1.4.3
github.com/hashicorp/errwrap v1.0.0
github.com/hashicorp/go-cleanhttp v0.5.1
github.com/hashicorp/go-gcp-common v0.6.0
github.com/hashicorp/go-hclog v0.12.0
github.com/hashicorp/go-uuid v1.0.2
github.com/hashicorp/vault/api v1.0.5-0.20200215224050-f6547fa8e820
github.com/hashicorp/vault/sdk v0.1.14-0.20200215224050-f6547fa8e820
github.com/hashicorp/yamux v0.0.0-20181012175058-2f1d1f20f75d // indirect
Expand Down
10 changes: 10 additions & 0 deletions go.sum
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Original file line number Diff line number Diff line change
Expand Up @@ -43,7 +43,10 @@ github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b h1:VKtxabqXZkF25pY9ekf
github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
github.com/golang/lint v0.0.0-20180702182130-06c8688daad7/go.mod h1:tluoj9z5200jBnyusfRPU2LqT6J+DAorxEvtC7LHB+E=
github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
github.com/golang/mock v1.2.0 h1:28o5sBqPkBsMGnC6b4MvE2TzSr5/AT4c/1fLqVGIwlk=
github.com/golang/mock v1.2.0/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
github.com/golang/mock v1.4.3 h1:GV+pQPG/EUUbkh47niozDcADz6go/dUwhVzdUQHIVRw=
github.com/golang/mock v1.4.3/go.mod h1:UOMv5ysSaYNkG+OFQykRIcU/QvvxJf3p21QfJ2Bt3cw=
github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
github.com/golang/protobuf v1.3.2 h1:6nsPYzhq5kReh6QImI3k5qWzO4PEbvbIW2cwSfR/6xs=
github.com/golang/protobuf v1.3.2/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
Expand Down Expand Up @@ -215,6 +218,7 @@ golang.org/x/sys v0.0.0-20190403152447-81d4e9dc473e h1:nFYrTHrdrAOpShe27kaFHjsqY
golang.org/x/sys v0.0.0-20190403152447-81d4e9dc473e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20191008105621-543471e840be h1:QAcqgptGM8IQBC9K/RC4o+O9YmqEm0diQn9QmZw/0mU=
golang.org/x/sys v0.0.0-20191008105621-543471e840be/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
golang.org/x/text v0.3.1-0.20181227161524-e6919f6577db h1:6/JqlYfC1CCaLnGceQTI+sDGhC9UBSPAsBqI0Gun6kU=
golang.org/x/text v0.3.1-0.20181227161524-e6919f6577db/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
Expand All @@ -227,6 +231,8 @@ golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGm
golang.org/x/tools v0.0.0-20190226205152-f727befe758c/go.mod h1:9Yl7xja0Znq3iFh3HoIrodX9oNMXvdceNzlUR8zjMvY=
golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
golang.org/x/tools v0.0.0-20190312170243-e65039ee4138/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
golang.org/x/tools v0.0.0-20190425150028-36563e24a262/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
golang.org/x/tools v0.0.0-20190524140312-2c0ae7006135 h1:5Beo0mZN8dRzgrMMkDp0jc8YXQKx9DiJ2k1dkvGsn5A=
golang.org/x/tools v0.0.0-20190524140312-2c0ae7006135/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
google.golang.org/api v0.0.0-20181220000619-583d854617af/go.mod h1:4mhQ8q/RsB7i+udVvVy5NUi08OU8ZlA0gRVgrF7VFY0=
google.golang.org/api v0.2.0/go.mod h1:IfRCZScioGtypHNTlz3gFk67J8uePVW7uDTBzXuIkhU=
Expand Down Expand Up @@ -262,3 +268,7 @@ honnef.co/go/tools v0.0.0-20180728063816-88497007e858/go.mod h1:rf3lG4BRIbNafJWh
honnef.co/go/tools v0.0.0-20180920025451-e3ad64cb4ed3/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
rsc.io/quote/v3 v3.1.0 h1:9JKUTTIUgS6kzR9mK1YuGKv6Nl+DijDNIc0ghT58FaY=
rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
rsc.io/sampler v1.3.0 h1:7uVkIFmeBqHfdjD+gZwtXXI+RODJ2Wc4O7MPEh/QiW4=
rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
97 changes: 97 additions & 0 deletions plugin/aliasing.go
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Original file line number Diff line number Diff line change
@@ -0,0 +1,97 @@
package gcpauth

import (
"fmt"
"sort"
"strconv"
"strings"

"google.golang.org/api/compute/v1"
"google.golang.org/api/iam/v1"
)

type aliasData struct {
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role *gcpRole
svcAccount *iam.ServiceAccount
instance *compute.Instance
}

type iamAliaser func(role *gcpRole, svcAccount *iam.ServiceAccount) (alias string)
type gceAliaser func(role *gcpRole, instance *compute.Instance) (alias string)

const (
defaultIAMAlias = "unique_id"
defaultGCEAlias = "instance_id"
)

var (
allowedIAMAliases = map[string]iamAliaser{
defaultIAMAlias: getIAMSvcAccountUniqueID,
"": getIAMSvcAccountUniqueID, // For backwards compatibility

"role_id": getIAMRoleID,
}
allowedGCEAliases = map[string]gceAliaser{
defaultGCEAlias: getGCEInstanceID,
"": getGCEInstanceID, // For backwards compatibility

"role_id": getGCERoleID,
}

allowedIAMAliasesSlice = iamMapKeyToSlice(allowedIAMAliases)
allowedGCEAliasesSlice = gceMapKeyToSlice(allowedGCEAliases)
)

func iamMapKeyToSlice(m map[string]iamAliaser) (s []string) {
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These could probably be reduced into a single function that accepts an interface and is type switched. Same with many of the get.. functions below.

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Unfortunately it wouldn't really help here. The function would have the same code in it (including both versions of the for loop), but wrapped up into a single function rather than two. There isn't a generic map type that can be used as a variable type that would allow the type coercion needed here. Additionally it's generally frowned upon to pass the empty interface around unless necessary.

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@tyrannosaurus-becks tyrannosaurus-becks Apr 23, 2020 •
edited
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I have generally found the same thing as well - when I have tried that approach it read awkwardly, but just in a different way. I don't think there's any "perfect" answer here, but I do like the more direct approach taken here because type conversions can be expensive.

Thank you for your review, by the way, broamski!

for key := range m {
if key == "" {
continue
}
s = append(s, key)
}
sort.Strings(s)
return s
}

func gceMapKeyToSlice(m map[string]gceAliaser) (s []string) {
for key := range m {
if key == "" {
continue
}
s = append(s, key)
}
sort.Strings(s)
return s
}

func getIAMSvcAccountUniqueID(_ *gcpRole, svcAccount *iam.ServiceAccount) (alias string) {
return svcAccount.UniqueId
}

func getIAMRoleID(role *gcpRole, _ *iam.ServiceAccount) (alias string) {
return role.RoleID
}

func getGCEInstanceID(_ *gcpRole, instance *compute.Instance) (alias string) {
return fmt.Sprintf("gce-%s", strconv.FormatUint(instance.Id, 10))
}

func getGCERoleID(role *gcpRole, _ *compute.Instance) (alias string) {
return role.RoleID
}

func getIAMAlias(role *gcpRole, svcAccount *iam.ServiceAccount) (alias string, err error) {
aliaser, exists := allowedIAMAliases[role.IAMAliasType]
if !exists {
return "", fmt.Errorf("invalid IAM alias type: must be one of: %s", strings.Join(allowedIAMAliasesSlice, ", "))
}
return aliaser(role, svcAccount), nil
}

func getGCEAlias(role *gcpRole, instance *compute.Instance) (alias string, err error) {
aliaser, exists := allowedGCEAliases[role.GCEAliasType]
if !exists {
return "", fmt.Errorf("invalid GCE alias type: must be one of: %s", strings.Join(allowedIAMAliasesSlice, ", "))
}
return aliaser(role, instance), nil
}
150 changes: 150 additions & 0 deletions plugin/aliasing_test.go
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@@ -0,0 +1,150 @@
package gcpauth

import (
"testing"

"google.golang.org/api/compute/v1"
"google.golang.org/api/iam/v1"
)

func TestGetIAMAlias(t *testing.T) {
type testCase struct {
role *gcpRole
svcAccount *iam.ServiceAccount
expectedAlias string
expectErr bool
}

tests := map[string]testCase{
"invalid type": {
role: &gcpRole{
IAMAliasType: "bogus",
RoleID: "testRoleID",
},
svcAccount: &iam.ServiceAccount{
UniqueId: "iamUniqueID",
},
expectedAlias: "",
expectErr: true,
},
"empty type goes to default": {
role: &gcpRole{
IAMAliasType: "",
RoleID: "testRoleID",
},
svcAccount: &iam.ServiceAccount{
UniqueId: "iamUniqueID",
},
expectedAlias: "iamUniqueID",
expectErr: false,
},
"default type": {
role: &gcpRole{
IAMAliasType: defaultIAMAlias,
RoleID: "testRoleID",
},
svcAccount: &iam.ServiceAccount{
UniqueId: "iamUniqueID",
},
expectedAlias: "iamUniqueID",
expectErr: false,
},
"role_id": {
role: &gcpRole{
IAMAliasType: "role_id",
RoleID: "testRoleID",
},
svcAccount: &iam.ServiceAccount{
UniqueId: "iamUniqueID",
},
expectedAlias: "testRoleID",
expectErr: false,
},
}

for name, test := range tests {
t.Run(name, func(t *testing.T) {
actualAlias, err := getIAMAlias(test.role, test.svcAccount)
if test.expectErr && err == nil {
t.Fatalf("err expected, got nil")
}
if !test.expectErr && err != nil {
t.Fatalf("no error expected, got: %s", err)
}
if actualAlias != test.expectedAlias {
t.Fatalf("Actual alias: %s Expected Alias: %s", actualAlias, test.expectedAlias)
}
})
}
}

func TestGetGCEAlias(t *testing.T) {
type testCase struct {
role *gcpRole
instance *compute.Instance
expectedAlias string
expectErr bool
}

tests := map[string]testCase{
"invalid type": {
role: &gcpRole{
GCEAliasType: "bogus",
RoleID: "testRoleID",
},
instance: &compute.Instance{
Id: 123,
},
expectedAlias: "",
expectErr: true,
},
"empty type goes to default": {
role: &gcpRole{
GCEAliasType: "",
RoleID: "testRoleID",
},
instance: &compute.Instance{
Id: 123,
},
expectedAlias: "gce-123",
expectErr: false,
},
"default type": {
role: &gcpRole{
GCEAliasType: defaultGCEAlias,
RoleID: "testRoleID",
},
instance: &compute.Instance{
Id: 123,
},
expectedAlias: "gce-123",
expectErr: false,
},
"role_id": {
role: &gcpRole{
GCEAliasType: "role_id",
RoleID: "testRoleID",
},
instance: &compute.Instance{
Id: 123,
},
expectedAlias: "testRoleID",
expectErr: false,
},
}

for name, test := range tests {
t.Run(name, func(t *testing.T) {
actualAlias, err := getGCEAlias(test.role, test.instance)
if test.expectErr && err == nil {
t.Fatalf("err expected, got nil")
}
if !test.expectErr && err != nil {
t.Fatalf("no error expected, got: %s", err)
}
if actualAlias != test.expectedAlias {
t.Fatalf("Actual alias: %s Expected Alias: %s", actualAlias, test.expectedAlias)
}
})
}
}
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