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Microsoft connector: add support for Federated Identity to avoid secrets
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Fixes dexidp#3852

Maintaining shared secrets in the application's configuration is not good, and should be avoided as possible. This includes the client secret used by the Microsoft connector to exchange authorization codes for access tokens using Entra ID (fka Azure AD).

It is possible to avoid using secrets by leveraging a [signed assertion](https://learn.microsoft.com/en-us/entra/identity-platform/v2-oauth2-auth-code-flow#request-an-access-token-with-a-certificate-credential), which comes from managed identity (when the app is running on Azure) or [Workload Identity](https://learn.microsoft.com/en-us/entra/workload-id/workload-identity-federation) (when the app is running on a supported platform, including K8s anywhere).

This is configured with a new configuration key `federatedIdentity` which can have 3 values (all case-insensitive):

- `ManagedIdentity` -> Uses a system-assigned managed identity
- `ManagedIdentity=00000000-0000-0000-0000-000000000000` -> Uses a user-assigned managed identity, where the value is the client ID of the MI
- `WorkloadIdentity` -> uses Workload Identity

Signed-off-by: ItalyPaleAle <[email protected]>
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@ItalyPaleAle
ItalyPaleAle committed Dec 5, 2024
1 parent 2476f0e commit 6002ed3
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Showing 3 changed files with 96 additions and 4 deletions.
67 changes: 65 additions & 2 deletions connector/microsoft/microsoft.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,9 @@ import (
"sync"
"time"

"github.com/Azure/azure-sdk-for-go/sdk/azcore"
"github.com/Azure/azure-sdk-for-go/sdk/azcore/policy"
"github.com/Azure/azure-sdk-for-go/sdk/azidentity"
"golang.org/x/oauth2"

"github.com/dexidp/dex/connector"
Expand Down Expand Up @@ -46,6 +49,7 @@ const (
type Config struct {
ClientID string `json:"clientID"`
ClientSecret string `json:"clientSecret"`
FederatedIdentity string `json:"federatedIdentity"`
RedirectURI string `json:"redirectURI"`
Tenant string `json:"tenant"`
OnlySecurityGroups bool `json:"onlySecurityGroups"`
Expand Down Expand Up @@ -108,6 +112,15 @@ func (c *Config) Open(id string, logger *slog.Logger) (connector.Connector, erro
return nil, fmt.Errorf("invalid groupNameFormat: %s", m.groupNameFormat)
}

// Init Federated Identity Credentials if needed
// This is only done if there's no client secret
if c.ClientSecret == "" && c.FederatedIdentity != "" {
err := m.initFederatedIdentity(c.FederatedIdentity)
if err != nil {
return nil, fmt.Errorf("failed to init federated identity credentials: %w", err)
}
}

return &m, nil
}

Expand Down Expand Up @@ -138,6 +151,7 @@ type microsoftConnector struct {
promptType string
domainHint string
scopes []string
fic azcore.TokenCredential
}

func (c *microsoftConnector) isOrgTenant() bool {
Expand Down Expand Up @@ -175,12 +189,43 @@ func (c *microsoftConnector) oauth2Config(scopes connector.Scopes) *oauth2.Confi
}
}

func (c *microsoftConnector) initFederatedIdentity(afi string) (err error) {
// Crete the federated identity credential object depending on the kind of federated identity
afiLc := strings.ToLower(afi)
switch {
case strings.HasPrefix(afiLc, "managedidentity="):
// User-assigned managed identity
c.fic, err = azidentity.NewManagedIdentityCredential(&azidentity.ManagedIdentityCredentialOptions{
ID: azidentity.ClientID(afiLc[len("managedidentity="):]),
})
if err != nil {
return fmt.Errorf("failed to create managed identity credential object: %w", err)
}
case afiLc == "managedidentity":
// System-assigned managed identity
c.fic, err = azidentity.NewManagedIdentityCredential(nil)
if err != nil {
return fmt.Errorf("failed to create managed identity credential object: %w", err)
}
case afiLc == "workloadidentity":
// Workload Identity
c.fic, err = azidentity.NewWorkloadIdentityCredential(nil)
if err != nil {
return fmt.Errorf("failed to create workload identity credential object: %w", err)
}
default:
return fmt.Errorf("invalid value for configuration option 'azureFederatedIdentity': '%s'", afi)
}

return nil
}

func (c *microsoftConnector) LoginURL(scopes connector.Scopes, callbackURL, state string) (string, error) {
if c.redirectURI != callbackURL {
return "", fmt.Errorf("expected callback URL %q did not match the URL in the config %q", callbackURL, c.redirectURI)
}

var options []oauth2.AuthCodeOption
options := make([]oauth2.AuthCodeOption, 0, 2)
if c.promptType != "" {
options = append(options, oauth2.SetAuthURLParam("prompt", c.promptType))
}
Expand All @@ -201,7 +246,25 @@ func (c *microsoftConnector) HandleCallback(s connector.Scopes, r *http.Request)

ctx := r.Context()

token, err := oauth2Config.Exchange(ctx, q.Get("code"))
opts := make([]oauth2.AuthCodeOption, 0, 2)
if c.fic != nil {
// Get the client assertion
clientAssertion, err := c.fic.GetToken(ctx, policy.TokenRequestOptions{
// This is a constant value
Scopes: []string{"api://AzureADTokenExchange"},
})
if err != nil {
return identity, fmt.Errorf("failed to obtain client assertion: %w", err)
}

// This is a constant value
opts = append(opts,
oauth2.SetAuthURLParam("client_assertion_type", "urn:ietf:params:oauth:client-assertion-type:jwt-bearer"),
oauth2.SetAuthURLParam("client_assertion", clientAssertion.Token),
)
}

token, err := oauth2Config.Exchange(ctx, q.Get("code"), opts...)
if err != nil {
return identity, fmt.Errorf("microsoft: failed to get token: %v", err)
}
Expand Down
6 changes: 6 additions & 0 deletions go.mod
View file
Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,8 @@ require (
cloud.google.com/go/compute/metadata v0.5.2
entgo.io/ent v0.14.0
github.com/AppsFlyer/go-sundheit v0.6.0
github.com/Azure/azure-sdk-for-go/sdk/azcore v1.16.0
github.com/Azure/azure-sdk-for-go/sdk/azidentity v1.8.0
github.com/Masterminds/semver v1.5.0
github.com/Masterminds/sprig/v3 v3.3.0
github.com/beevik/etree v1.4.0
Expand Down Expand Up @@ -47,7 +49,9 @@ require (
cloud.google.com/go/auth/oauth2adapt v0.2.4 // indirect
dario.cat/mergo v1.0.1 // indirect
filippo.io/edwards25519 v1.1.0 // indirect
github.com/Azure/azure-sdk-for-go/sdk/internal v1.10.0 // indirect
github.com/Azure/go-ntlmssp v0.0.0-20221128193559-754e69321358 // indirect
github.com/AzureAD/microsoft-authentication-library-for-go v1.2.2 // indirect
github.com/Masterminds/goutils v1.1.1 // indirect
github.com/Masterminds/semver/v3 v3.3.0 // indirect
github.com/agext/levenshtein v1.2.1 // indirect
Expand All @@ -63,6 +67,7 @@ require (
github.com/go-logr/stdr v1.2.2 // indirect
github.com/go-openapi/inflect v0.19.0 // indirect
github.com/gogo/protobuf v1.3.2 // indirect
github.com/golang-jwt/jwt/v5 v5.2.1 // indirect
github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
github.com/golang/protobuf v1.5.4 // indirect
github.com/google/go-cmp v0.6.0 // indirect
Expand All @@ -78,6 +83,7 @@ require (
github.com/mitchellh/go-wordwrap v0.0.0-20150314170334-ad45545899c7 // indirect
github.com/mitchellh/reflectwalk v1.0.2 // indirect
github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
github.com/pkg/browser v0.0.0-20240102092130-5ac0b6a4141c // indirect
github.com/pmezard/go-difflib v1.0.0 // indirect
github.com/prometheus/client_model v0.6.1 // indirect
github.com/prometheus/common v0.55.0 // indirect
Expand Down
27 changes: 25 additions & 2 deletions go.sum
View file
Original file line number Diff line number Diff line change
Expand Up @@ -15,8 +15,20 @@ filippo.io/edwards25519 v1.1.0 h1:FNf4tywRC1HmFuKW5xopWpigGjJKiJSV0Cqo0cJWDaA=
filippo.io/edwards25519 v1.1.0/go.mod h1:BxyFTGdWcka3PhytdK4V28tE5sGfRvvvRV7EaN4VDT4=
github.com/AppsFlyer/go-sundheit v0.6.0 h1:d2hBvCjBSb2lUsEWGfPigr4MCOt04sxB+Rppl0yUMSk=
github.com/AppsFlyer/go-sundheit v0.6.0/go.mod h1:LDdBHD6tQBtmHsdW+i1GwdTt6Wqc0qazf5ZEJVTbTME=
github.com/Azure/azure-sdk-for-go/sdk/azcore v1.16.0 h1:JZg6HRh6W6U4OLl6lk7BZ7BLisIzM9dG1R50zUk9C/M=
github.com/Azure/azure-sdk-for-go/sdk/azcore v1.16.0/go.mod h1:YL1xnZ6QejvQHWJrX/AvhFl4WW4rqHVoKspWNVwFk0M=
github.com/Azure/azure-sdk-for-go/sdk/azidentity v1.8.0 h1:B/dfvscEQtew9dVuoxqxrUKKv8Ih2f55PydknDamU+g=
github.com/Azure/azure-sdk-for-go/sdk/azidentity v1.8.0/go.mod h1:fiPSssYvltE08HJchL04dOy+RD4hgrjph0cwGGMntdI=
github.com/Azure/azure-sdk-for-go/sdk/azidentity/cache v0.3.0 h1:+m0M/LFxN43KvULkDNfdXOgrjtg6UYJPFBJyuEcRCAw=
github.com/Azure/azure-sdk-for-go/sdk/azidentity/cache v0.3.0/go.mod h1:PwOyop78lveYMRs6oCxjiVyBdyCgIYH6XHIVZO9/SFQ=
github.com/Azure/azure-sdk-for-go/sdk/internal v1.10.0 h1:ywEEhmNahHBihViHepv3xPBn1663uRv2t2q/ESv9seY=
github.com/Azure/azure-sdk-for-go/sdk/internal v1.10.0/go.mod h1:iZDifYGJTIgIIkYRNWPENUnqx6bJ2xnSDFI2tjwZNuY=
github.com/Azure/go-ntlmssp v0.0.0-20221128193559-754e69321358 h1:mFRzDkZVAjdal+s7s0MwaRv9igoPqLRdzOLzw/8Xvq8=
github.com/Azure/go-ntlmssp v0.0.0-20221128193559-754e69321358/go.mod h1:chxPXzSsl7ZWRAuOIE23GDNzjWuZquvFlgA8xmpunjU=
github.com/AzureAD/microsoft-authentication-extensions-for-go/cache v0.1.1 h1:WJTmL004Abzc5wDB5VtZG2PJk5ndYDgVacGqfirKxjM=
github.com/AzureAD/microsoft-authentication-extensions-for-go/cache v0.1.1/go.mod h1:tCcJZ0uHAmvjsVYzEFivsRTN00oz5BEsRgQHu5JZ9WE=
github.com/AzureAD/microsoft-authentication-library-for-go v1.2.2 h1:XHOnouVk1mxXfQidrMEnLlPk9UMeRtyBTnEFtxkV0kU=
github.com/AzureAD/microsoft-authentication-library-for-go v1.2.2/go.mod h1:wP83P5OoQ5p6ip3ScPr0BAq0BvuPAvacpEuSzyouqAI=
github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
github.com/DATA-DOG/go-sqlmock v1.5.0 h1:Shsta01QNfFxHCfpW6YH2STWB0MudeXXEWMr20OEh60=
github.com/DATA-DOG/go-sqlmock v1.5.0/go.mod h1:f/Ixk793poVmq4qj/V1dPUg2JEAKC73Q5eFN3EC/SaM=
Expand Down Expand Up @@ -55,6 +67,8 @@ github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ3
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f h1:lO4WD4F/rVNCu3HqELle0jiPLLBs70cWOduZpkS1E78=
github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f/go.mod h1:cuUVRXasLTGF7a8hSLbxyZXjz+1KgoB3wDUb6vlszIc=
github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
github.com/envoyproxy/go-control-plane v0.9.4/go.mod h1:6rpuAdCZL397s3pYoYcLgu1mIlRU8Am5FuJP05cCM98=
Expand Down Expand Up @@ -89,6 +103,8 @@ github.com/go-test/deep v1.0.3/go.mod h1:wGDj63lr65AM2AQyKZd/NYHGb0R+1RLqB8NKt3a
github.com/godbus/dbus/v5 v5.0.4/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA=
github.com/gogo/protobuf v1.3.2 h1:Ov1cvc58UF3b5XjBnZv7+opcTcQFZebYjWzi34vdm4Q=
github.com/gogo/protobuf v1.3.2/go.mod h1:P1XiOD3dCwIKUDQYPy72D8LYyHL2YPYrpS2s69NZV8Q=
github.com/golang-jwt/jwt/v5 v5.2.1 h1:OuVbFODueb089Lh128TAcimifWaLhJwVflnrgM17wHk=
github.com/golang-jwt/jwt/v5 v5.2.1/go.mod h1:pqrtFR0X4osieyHYxtmOUWsAWrfe1Q5UVIyoH402zdk=
github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
github.com/golang/groupcache v0.0.0-20200121045136-8c9f03a8e57e/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da h1:oI5xCqsCo564l8iNU+DwB5epxmsaqB+rhGL0m5jtYqE=
Expand Down Expand Up @@ -155,6 +171,8 @@ github.com/jcmturner/rpc/v2 v2.0.3 h1:7FXXj8Ti1IaVFpSAziCZWNzbNuZmnvw/i6CqLNdWfZ
github.com/jcmturner/rpc/v2 v2.0.3/go.mod h1:VUJYCIDm3PVOEHw8sgt091/20OJjskO/YJki3ELg/Hc=
github.com/jonboulle/clockwork v0.2.2 h1:UOGuzwb1PwsrDAObMuhUnj0p5ULPj8V/xJ7Kx9qUBdQ=
github.com/jonboulle/clockwork v0.2.2/go.mod h1:Pkfl5aHPm1nk2H9h0bjmnJD/BcgbGXUBGnn1kMkgxc8=
github.com/keybase/go-keychain v0.0.0-20231219164618-57a3676c3af6 h1:IsMZxCuZqKuao2vNdfD82fjjgPLfyHLpR41Z88viRWs=
github.com/keybase/go-keychain v0.0.0-20231219164618-57a3676c3af6/go.mod h1:3VeWNIJaW+O5xpRQbPp0Ybqu1vJd/pm7s2F473HRrkw=
github.com/kisielk/errcheck v1.5.0/go.mod h1:pFxgyoBC7bSaBwPgfKdkLd5X25qrDl4LWUI2bnpBCr8=
github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
github.com/klauspost/compress v1.17.9 h1:6KIumPrER1LHsvBVuDa0r5xaG0Es51mhhB9BQB2qeMA=
Expand Down Expand Up @@ -186,6 +204,8 @@ github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 h1:C3w9PqII01/Oq
github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822/go.mod h1:+n7T8mK8HuQTcFwEeznm/DIxMOiR9yIdICNftLE1DvQ=
github.com/oklog/run v1.1.0 h1:GEenZ1cK0+q0+wsJew9qUg/DyD8k3JzYsZAi5gYi2mA=
github.com/oklog/run v1.1.0/go.mod h1:sVPdnTZT1zYwAJeCMu2Th4T21pA3FPOQRfWjQlk7DVU=
github.com/pkg/browser v0.0.0-20240102092130-5ac0b6a4141c h1:+mdjkGKdHQG3305AYmdv1U2eRNDiU2ErMBj1gwrq8eQ=
github.com/pkg/browser v0.0.0-20240102092130-5ac0b6a4141c/go.mod h1:7rwL4CYBLnjLxUqIJNnCWiEdr3bn6IUYi15bNlnbCCU=
github.com/pkg/diff v0.0.0-20210226163009-20ebb0f2a09e/go.mod h1:pJLUxLENpZxwdsKMEsNbx1VGcRFpLqf3715MtcvvzbA=
github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
Expand All @@ -201,10 +221,12 @@ github.com/prometheus/common v0.55.0 h1:KEi6DK7lXW/m7Ig5i47x0vRzuBsHuvJdi5ee6Y3G
github.com/prometheus/common v0.55.0/go.mod h1:2SECS4xJG1kd8XF9IcM1gMX6510RAEL65zxzNImwdc8=
github.com/prometheus/procfs v0.15.1 h1:YagwOFzUgYfKKHX6Dr+sHT7km/hxC76UB0learggepc=
github.com/prometheus/procfs v0.15.1/go.mod h1:fB45yRUv8NstnjriLhBQLuOUt+WW4BsoGhij/e3PBqk=
github.com/redis/go-redis/v9 v9.6.1 h1:HHDteefn6ZkTtY5fGUE8tj8uy85AHk6zP7CpzIAM0y4=
github.com/redis/go-redis/v9 v9.6.1/go.mod h1:0C0c6ycQsdpVNQpxb1njEQIqkx5UcsM8FJCQLgE9+RA=
github.com/rogpeppe/go-internal v1.6.1/go.mod h1:xXDCJY+GAPziupqXw64V24skbSoqbTEfhy4qGm1nDQc=
github.com/rogpeppe/go-internal v1.8.0/go.mod h1:WmiCO8CzOY8rg0OYDC4/i/2WRWAB6poM+XZ2dLUbcbE=
github.com/rogpeppe/go-internal v1.10.0 h1:TMyTOH3F/DB16zRVcYyreMH6GnZZrwQVAoYjRBZyWFQ=
github.com/rogpeppe/go-internal v1.10.0/go.mod h1:UQnix2H7Ngw/k4C5ijL5+65zddjncjaFoBhdsK/akog=
github.com/rogpeppe/go-internal v1.12.0 h1:exVL4IDcn6na9z1rAb56Vxr+CgyK3nn3O+epU5NdKM8=
github.com/rogpeppe/go-internal v1.12.0/go.mod h1:E+RYuTGaKKdloAfM02xzb0FW3Paa99yedzYV+kq4uf4=
github.com/russellhaering/goxmldsig v1.4.0 h1:8UcDh/xGyQiyrW+Fq5t8f+l2DLB1+zlhYzkPUJ7Qhys=
github.com/russellhaering/goxmldsig v1.4.0/go.mod h1:gM4MDENBQf7M+V824SGfyIUVFWydB7n0KkEubVJl+Tw=
github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
Expand Down Expand Up @@ -326,6 +348,7 @@ golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7w
golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.1.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.8.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.17.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
Expand Down

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