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connector/saml: Adding group filtering

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- 4 new tests
- Doc changes to use the group filtering
This commit is contained in:
Ken Perkins 2019-09-10 06:13:50 -07:00
parent 8427f0f15c
commit 285c1f162e
3 changed files with 150 additions and 27 deletions
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8
Documentation/connectors/saml.md
View file

@ -14,6 +14,10 @@ __The connector doesn't support refresh tokens__ since the SAML 2.0 protocol doe
The connector doesn't support signed AuthnRequests or encrypted attributes.
## Group Filtering
The SAML Connector supports providing a whitelist of SAML Groups to filter access based on, and when the `groupsattr` is set with a scope including groups, Dex will check for membership based on configured groups in the `allowedGroups` config setting for the SAML connector.
## Configuration
```yaml
@ -44,6 +48,10 @@ connectors:
emailAttr: email
groupsAttr: groups # optional
# List of groups to filter access based on membership
# allowedGroups
# - Admins
# CA's can also be provided inline as a base64'd blob.
#
# caData: ( RAW base64'd PEM encoded CA )

59
connector/saml/saml.go
View file

@ -15,6 +15,7 @@ import (
"github.com/beevik/etree"
"github.com/dexidp/dex/connector"
"github.com/dexidp/dex/pkg/groups"
"github.com/dexidp/dex/pkg/log"
dsig "github.com/russellhaering/goxmldsig"
"github.com/russellhaering/goxmldsig/etreeutils"
@ -97,9 +98,9 @@ type Config struct {
// If GroupsDelim is supplied the connector assumes groups are returned as a
// single string instead of multiple attribute values. This delimiter will be
// used split the groups string.
GroupsDelim string `json:"groupsDelim"`
RedirectURI string `json:"redirectURI"`
GroupsDelim string `json:"groupsDelim"`
AllowedGroups []string `json:"allowedGroups"`
RedirectURI string `json:"redirectURI"`
// Requested format of the NameID. The NameID value is is mapped to the ID Token
// 'sub' claim.
@ -154,16 +155,17 @@ func (c *Config) openConnector(logger log.Logger) (*provider, error) {
}
p := &provider{
entityIssuer: c.EntityIssuer,
ssoIssuer: c.SSOIssuer,
ssoURL: c.SSOURL,
now: time.Now,
usernameAttr: c.UsernameAttr,
emailAttr: c.EmailAttr,
groupsAttr: c.GroupsAttr,
groupsDelim: c.GroupsDelim,
redirectURI: c.RedirectURI,
logger: logger,
entityIssuer: c.EntityIssuer,
ssoIssuer: c.SSOIssuer,
ssoURL: c.SSOURL,
now: time.Now,
usernameAttr: c.UsernameAttr,
emailAttr: c.EmailAttr,
groupsAttr: c.GroupsAttr,
groupsDelim: c.GroupsDelim,
allowedGroups: c.AllowedGroups,
redirectURI: c.RedirectURI,
logger: logger,
nameIDPolicyFormat: c.NameIDPolicyFormat,
}
@ -232,10 +234,11 @@ type provider struct {
validator *dsig.ValidationContext
// Attribute mappings
usernameAttr string
emailAttr string
groupsAttr string
groupsDelim string
usernameAttr string
emailAttr string
groupsAttr string
groupsDelim string
allowedGroups []string
redirectURI string
@ -388,11 +391,16 @@ func (p *provider) HandlePOST(s connector.Scopes, samlResponse, inResponseTo str
return ident, fmt.Errorf("no attribute with name %q: %s", p.usernameAttr, attributes.names())
}
if !s.Groups || p.groupsAttr == "" {
if len(p.allowedGroups) == 0 && (!s.Groups || p.groupsAttr == "") {
// Groups not requested or not configured. We're done.
return ident, nil
}
if len(p.allowedGroups) > 0 && (!s.Groups || p.groupsAttr == "") {
// allowedGroups set but no groups or groupsAttr. Disallowing.
return ident, fmt.Errorf("User not a member of allowed groups")
}
// Grab the groups.
if p.groupsDelim != "" {
groupsStr, ok := attributes.get(p.groupsAttr)
@ -408,6 +416,21 @@ func (p *provider) HandlePOST(s connector.Scopes, samlResponse, inResponseTo str
}
ident.Groups = groups
}
if len(p.allowedGroups) == 0 {
// No allowed groups set, just return the ident
return ident, nil
}
// Look for membership in one of the allowed groups
groupMatches := groups.Filter(ident.Groups, p.allowedGroups)
if len(groupMatches) == 0 {
// No group membership matches found, disallowing
return ident, fmt.Errorf("User not a member of allowed groups")
}
// Otherwise, we're good
return ident, nil
}

110
connector/saml/saml_test.go
View file

@ -49,9 +49,10 @@ type responseTest struct {
entityIssuer string
// Attribute customization.
usernameAttr string
emailAttr string
groupsAttr string
usernameAttr string
emailAttr string
groupsAttr string
allowedGroups []string
// Expected outcome of the test.
wantErr bool
@ -98,6 +99,96 @@ func TestGroups(t *testing.T) {
test.run(t)
}
func TestGroupsWhitelist(t *testing.T) {
test := responseTest{
caFile: "testdata/ca.crt",
respFile: "testdata/good-resp.xml",
now: "2017-04-04T04:34:59.330Z",
usernameAttr: "Name",
emailAttr: "email",
groupsAttr: "groups",
allowedGroups: []string{"Admins"},
inResponseTo: "6zmm5mguyebwvajyf2sdwwcw6m",
redirectURI: "http://127.0.0.1:5556/dex/callback",
wantIdent: connector.Identity{
UserID: "eric.chiang+okta@coreos.com",
Username: "Eric",
Email: "eric.chiang+okta@coreos.com",
EmailVerified: true,
Groups: []string{"Admins", "Everyone"},
},
}
test.run(t)
}
func TestGroupsWhitelistEmpty(t *testing.T) {
test := responseTest{
caFile: "testdata/ca.crt",
respFile: "testdata/good-resp.xml",
now: "2017-04-04T04:34:59.330Z",
usernameAttr: "Name",
emailAttr: "email",
groupsAttr: "groups",
allowedGroups: []string{},
inResponseTo: "6zmm5mguyebwvajyf2sdwwcw6m",
redirectURI: "http://127.0.0.1:5556/dex/callback",
wantIdent: connector.Identity{
UserID: "eric.chiang+okta@coreos.com",
Username: "Eric",
Email: "eric.chiang+okta@coreos.com",
EmailVerified: true,
Groups: []string{"Admins", "Everyone"},
},
}
test.run(t)
}
func TestGroupsWhitelistDisallowed(t *testing.T) {
test := responseTest{
wantErr: true,
caFile: "testdata/ca.crt",
respFile: "testdata/good-resp.xml",
now: "2017-04-04T04:34:59.330Z",
usernameAttr: "Name",
emailAttr: "email",
groupsAttr: "groups",
allowedGroups: []string{"Nope"},
inResponseTo: "6zmm5mguyebwvajyf2sdwwcw6m",
redirectURI: "http://127.0.0.1:5556/dex/callback",
wantIdent: connector.Identity{
UserID: "eric.chiang+okta@coreos.com",
Username: "Eric",
Email: "eric.chiang+okta@coreos.com",
EmailVerified: true,
Groups: []string{"Admins", "Everyone"},
},
}
test.run(t)
}
func TestGroupsWhitelistDisallowedNoGroupsOnIdent(t *testing.T) {
test := responseTest{
wantErr: true,
caFile: "testdata/ca.crt",
respFile: "testdata/good-resp.xml",
now: "2017-04-04T04:34:59.330Z",
usernameAttr: "Name",
emailAttr: "email",
groupsAttr: "groups",
allowedGroups: []string{"Nope"},
inResponseTo: "6zmm5mguyebwvajyf2sdwwcw6m",
redirectURI: "http://127.0.0.1:5556/dex/callback",
wantIdent: connector.Identity{
UserID: "eric.chiang+okta@coreos.com",
Username: "Eric",
Email: "eric.chiang+okta@coreos.com",
EmailVerified: true,
Groups: []string{},
},
}
test.run(t)
}
// TestOkta tests against an actual response from Okta.
func TestOkta(t *testing.T) {
test := responseTest{
@ -290,12 +381,13 @@ func loadCert(ca string) (*x509.Certificate, error) {
func (r responseTest) run(t *testing.T) {
c := Config{
CA: r.caFile,
UsernameAttr: r.usernameAttr,
EmailAttr: r.emailAttr,
GroupsAttr: r.groupsAttr,
RedirectURI: r.redirectURI,
EntityIssuer: r.entityIssuer,
CA: r.caFile,
UsernameAttr: r.usernameAttr,
EmailAttr: r.emailAttr,
GroupsAttr: r.groupsAttr,
RedirectURI: r.redirectURI,
EntityIssuer: r.entityIssuer,
AllowedGroups: r.allowedGroups,
// Never logging in, don't need this.
SSOURL: "http://foo.bar/",
}