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chore: prevent authentication of non-unique oidc subjects #16498

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Merged
merged 7 commits into from
Feb 10, 2025
Merged

chore: prevent authentication of non-unique oidc subjects #16498

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c9599f2
chore: prevent non-unqiue oidc subjects from authenticating
Emyrk Feb 7, 2025
846a50a
also log
Emyrk Feb 7, 2025
08ea3e4
test: add unit tests
Emyrk Feb 7, 2025
3a69f1a
fix tests without subjects
Emyrk Feb 7, 2025
29314e4
add sub field to more tests
Emyrk Feb 10, 2025
ae4fe6f
add sub field to more tests
Emyrk Feb 10, 2025
ade4eb4
add sub field to more tests
Emyrk Feb 10, 2025
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14 changes: 14 additions & 0 deletions coderd/userauth.go
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Original file line number Diff line number Diff line change
Expand Up @@ -1112,6 +1112,20 @@ func (api *API) userOIDC(rw http.ResponseWriter, r *http.Request) {
return
}

if idToken.Subject == "" {
logger.Error(ctx, "oauth2: missing 'sub' claim field in OIDC token",
slog.F("source", "id_token"),
slog.F("claim_fields", claimFields(idtokenClaims)),
slog.F("blank", blankFields(idtokenClaims)),
)
httpapi.Write(ctx, rw, http.StatusBadRequest, codersdk.Response{
Message: "OIDC token missing 'sub' claim field or 'sub' claim field is empty.",
Detail: "'sub' claim field is required to be unique for all users by a given issue, " +
"an empty field is invalid and this authentication attempt is rejected.",
})
return
}

logger.Debug(ctx, "got oidc claims",
slog.F("source", "id_token"),
slog.F("claim_fields", claimFields(idtokenClaims)),
Expand Down
34 changes: 34 additions & 0 deletions coderd/userauth_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -899,10 +899,19 @@ func TestUserOIDC(t *testing.T) {
IgnoreEmailVerified bool
IgnoreUserInfo bool
}{
{
Name: "NoSub",
IDTokenClaims: jwt.MapClaims{
"email": "kyle@kwc.io",
},
AllowSignups: true,
StatusCode: http.StatusBadRequest,
},
{
Name: "EmailOnly",
IDTokenClaims: jwt.MapClaims{
"email": "kyle@kwc.io",
"sub": uuid.NewString(),
},
AllowSignups: true,
StatusCode: http.StatusOK,
Expand All @@ -915,6 +924,7 @@ func TestUserOIDC(t *testing.T) {
IDTokenClaims: jwt.MapClaims{
"email": "kyle@kwc.io",
"email_verified": false,
"sub": uuid.NewString(),
},
AllowSignups: true,
StatusCode: http.StatusForbidden,
Expand All @@ -924,6 +934,7 @@ func TestUserOIDC(t *testing.T) {
IDTokenClaims: jwt.MapClaims{
"email": 3.14159,
"email_verified": false,
"sub": uuid.NewString(),
},
AllowSignups: true,
StatusCode: http.StatusBadRequest,
Expand All @@ -933,6 +944,7 @@ func TestUserOIDC(t *testing.T) {
IDTokenClaims: jwt.MapClaims{
"email": "kyle@kwc.io",
"email_verified": false,
"sub": uuid.NewString(),
},
AllowSignups: true,
StatusCode: http.StatusOK,
Expand All @@ -946,6 +958,7 @@ func TestUserOIDC(t *testing.T) {
IDTokenClaims: jwt.MapClaims{
"email": "kyle@kwc.io",
"email_verified": true,
"sub": uuid.NewString(),
},
AllowSignups: true,
EmailDomain: []string{
Expand All @@ -958,6 +971,7 @@ func TestUserOIDC(t *testing.T) {
IDTokenClaims: jwt.MapClaims{
"email": "cian@coder.com",
"email_verified": true,
"sub": uuid.NewString(),
},
AllowSignups: true,
EmailDomain: []string{
Expand All @@ -970,6 +984,7 @@ func TestUserOIDC(t *testing.T) {
IDTokenClaims: jwt.MapClaims{
"email": "kyle@kwc.io",
"email_verified": true,
"sub": uuid.NewString(),
},
AllowSignups: true,
EmailDomain: []string{
Expand All @@ -982,6 +997,7 @@ func TestUserOIDC(t *testing.T) {
IDTokenClaims: jwt.MapClaims{
"email": "kyle@KWC.io",
"email_verified": true,
"sub": uuid.NewString(),
},
AllowSignups: true,
AssertUser: func(t testing.TB, u codersdk.User) {
Expand All @@ -997,6 +1013,7 @@ func TestUserOIDC(t *testing.T) {
IDTokenClaims: jwt.MapClaims{
"email": "colin@gmail.com",
"email_verified": true,
"sub": uuid.NewString(),
},
AllowSignups: true,
EmailDomain: []string{
Expand All @@ -1015,6 +1032,7 @@ func TestUserOIDC(t *testing.T) {
IDTokenClaims: jwt.MapClaims{
"email": "kyle@kwc.io",
"email_verified": true,
"sub": uuid.NewString(),
},
StatusCode: http.StatusForbidden,
},
Expand All @@ -1023,6 +1041,7 @@ func TestUserOIDC(t *testing.T) {
IDTokenClaims: jwt.MapClaims{
"email": "kyle@kwc.io",
"email_verified": true,
"sub": uuid.NewString(),
},
AssertUser: func(t testing.TB, u codersdk.User) {
assert.Equal(t, "kyle", u.Username)
Expand All @@ -1036,6 +1055,7 @@ func TestUserOIDC(t *testing.T) {
"email": "kyle@kwc.io",
"email_verified": true,
"preferred_username": "hotdog",
"sub": uuid.NewString(),
},
AssertUser: func(t testing.TB, u codersdk.User) {
assert.Equal(t, "hotdog", u.Username)
Expand All @@ -1049,6 +1069,7 @@ func TestUserOIDC(t *testing.T) {
"email": "kyle@kwc.io",
"email_verified": true,
"name": "Hot Dog",
"sub": uuid.NewString(),
},
AssertUser: func(t testing.TB, u codersdk.User) {
assert.Equal(t, "Hot Dog", u.Name)
Expand All @@ -1065,6 +1086,7 @@ func TestUserOIDC(t *testing.T) {
// However, we should not fail to log someone in if their name is too long.
// Just truncate it.
"name": strings.Repeat("a", 129),
"sub": uuid.NewString(),
},
AllowSignups: true,
StatusCode: http.StatusOK,
Expand All @@ -1080,6 +1102,7 @@ func TestUserOIDC(t *testing.T) {
// Full names must not have leading or trailing whitespace, but this is a
// daft reason to fail a login.
"name": " Bobby Whitespace ",
"sub": uuid.NewString(),
},
AllowSignups: true,
StatusCode: http.StatusOK,
Expand All @@ -1096,6 +1119,7 @@ func TestUserOIDC(t *testing.T) {
"email_verified": true,
"name": "Kylium Carbonate",
"preferred_username": "kyle@kwc.io",
"sub": uuid.NewString(),
},
AssertUser: func(t testing.TB, u codersdk.User) {
assert.Equal(t, "kyle", u.Username)
Expand All @@ -1108,6 +1132,7 @@ func TestUserOIDC(t *testing.T) {
Name: "UsernameIsEmail",
IDTokenClaims: jwt.MapClaims{
"preferred_username": "kyle@kwc.io",
"sub": uuid.NewString(),
},
AssertUser: func(t testing.TB, u codersdk.User) {
assert.Equal(t, "kyle", u.Username)
Expand All @@ -1123,6 +1148,7 @@ func TestUserOIDC(t *testing.T) {
"email_verified": true,
"preferred_username": "kyle",
"picture": "/example.png",
"sub": uuid.NewString(),
},
AssertUser: func(t testing.TB, u codersdk.User) {
assert.Equal(t, "/example.png", u.AvatarURL)
Expand All @@ -1136,6 +1162,7 @@ func TestUserOIDC(t *testing.T) {
IDTokenClaims: jwt.MapClaims{
"email": "kyle@kwc.io",
"email_verified": true,
"sub": uuid.NewString(),
},
UserInfoClaims: jwt.MapClaims{
"preferred_username": "potato",
Expand All @@ -1155,6 +1182,7 @@ func TestUserOIDC(t *testing.T) {
IDTokenClaims: jwt.MapClaims{
"email": "coolin@coder.com",
"groups": []string{"pingpong"},
"sub": uuid.NewString(),
},
AllowSignups: true,
StatusCode: http.StatusOK,
Expand All @@ -1164,6 +1192,7 @@ func TestUserOIDC(t *testing.T) {
IDTokenClaims: jwt.MapClaims{
"email": "internaluser@internal.domain",
"email_verified": false,
"sub": uuid.NewString(),
},
UserInfoClaims: jwt.MapClaims{
"email": "externaluser@external.domain",
Expand All @@ -1182,6 +1211,7 @@ func TestUserOIDC(t *testing.T) {
IDTokenClaims: jwt.MapClaims{
"email": "internaluser@internal.domain",
"email_verified": false,
"sub": uuid.NewString(),
},
UserInfoClaims: jwt.MapClaims{
"email": 1,
Expand All @@ -1197,6 +1227,7 @@ func TestUserOIDC(t *testing.T) {
"email_verified": true,
"name": "User McName",
"preferred_username": "user",
"sub": uuid.NewString(),
},
UserInfoClaims: jwt.MapClaims{
"email": "user.mcname@external.domain",
Expand All @@ -1216,6 +1247,7 @@ func TestUserOIDC(t *testing.T) {
IDTokenClaims: inflateClaims(t, jwt.MapClaims{
"email": "user@domain.tld",
"email_verified": true,
"sub": uuid.NewString(),
}, 65536),
AssertUser: func(t testing.TB, u codersdk.User) {
assert.Equal(t, "user", u.Username)
Expand All @@ -1228,6 +1260,7 @@ func TestUserOIDC(t *testing.T) {
IDTokenClaims: jwt.MapClaims{
"email": "user@domain.tld",
"email_verified": true,
"sub": uuid.NewString(),
},
UserInfoClaims: inflateClaims(t, jwt.MapClaims{}, 65536),
AssertUser: func(t testing.TB, u codersdk.User) {
Expand All @@ -1242,6 +1275,7 @@ func TestUserOIDC(t *testing.T) {
"iss": "https://mismatch.com",
"email": "user@domain.tld",
"email_verified": true,
"sub": uuid.NewString(),
},
AllowSignups: true,
StatusCode: http.StatusBadRequest,
Expand Down
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