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fleet/server/sso/authorization_response.go

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Server Side SSO Support (#1498) This PR partially addresses #1456, providing SSO SAML support. The flow of the code is as follows. A Kolide user attempts to access a protected resource and is directed to log in. If SSO identity providers (IDP) have been configured by an admin, the user is presented with SSO log in. The user selects SSO, which invokes a call the InitiateSSO passing the URL of the protected resource that the user was originally trying access. Kolide server loads the IDP metadata and caches it along with the URL. We then build an auth request URL for the IDP which is returned to the front end. The IDP calls the server, invoking CallbackSSO with the auth response. We extract the original request id from the response and use it to fetch the cached metadata and the URL. We check the signature of the response, and validate the timestamps. If everything passes we get the user id from the IDP response and use it to create a login session. We then build a page which executes some javascript that will write the token to web local storage, and redirect to the original URL. I've created a test web page in tools/app/authtest.html that can be used to test and debug new IDP's which also illustrates how a front end would interact with the IDP and the server. This page can be loaded by starting Kolide with the environment variable KOLIDE_TEST_PAGE_PATH to the full path of the page and then accessed at https://localhost:8080/test
2017-05-09 00:43:48 +00:00
package sso
import (
"bytes"
"encoding/base64"
"encoding/xml"
Rename project to Kolide Fleet (#1529)
2017-06-22 19:50:45 +00:00
"github.com/kolide/fleet/server/kolide"
Server Side SSO Support (#1498) This PR partially addresses #1456, providing SSO SAML support. The flow of the code is as follows. A Kolide user attempts to access a protected resource and is directed to log in. If SSO identity providers (IDP) have been configured by an admin, the user is presented with SSO log in. The user selects SSO, which invokes a call the InitiateSSO passing the URL of the protected resource that the user was originally trying access. Kolide server loads the IDP metadata and caches it along with the URL. We then build an auth request URL for the IDP which is returned to the front end. The IDP calls the server, invoking CallbackSSO with the auth response. We extract the original request id from the response and use it to fetch the cached metadata and the URL. We check the signature of the response, and validate the timestamps. If everything passes we get the user id from the IDP response and use it to create a login session. We then build a page which executes some javascript that will write the token to web local storage, and redirect to the original URL. I've created a test web page in tools/app/authtest.html that can be used to test and debug new IDP's which also illustrates how a front end would interact with the IDP and the server. This page can be loaded by starting Kolide with the environment variable KOLIDE_TEST_PAGE_PATH to the full path of the page and then accessed at https://localhost:8080/test
2017-05-09 00:43:48 +00:00
"github.com/pkg/errors"
)
const (
// These are response status codes described in the core SAML spec section
// 3.2.2.1 See http://docs.oasis-open.org/security/saml/v2.0/saml-core-2.0-os.pdf
Success int = iota
Requestor
Responder
VersionMismatch
AuthnFailed
InvalidAttrNameOrValue
InvalidNameIDPolicy
NoAuthnContext
NoAvailableIDP
NoPassive
NoSupportedIDP
PartialLogout
ProxyCountExceeded
RequestDenied
RequestUnsupported
RequestVersionDeprecated
RequestVersionTooHigh
RequestVersionTooLow
ResourceNotRecognized
TooManyResponses
UnknownAttrProfile
UnknownPrincipal
UnsupportedBinding
)
var statusMap = map[string]int{
"urn:oasis:names:tc:SAML:2.0:status:Success": Success,
"urn:oasis:names:tc:SAML:2.0:status:Requester": Requestor,
"urn:oasis:names:tc:SAML:2.0:status:Responder": Responder,
"urn:oasis:names:tc:SAML:2.0:status:VersionMismatch": VersionMismatch,
"urn:oasis:names:tc:SAML:2.0:status:AuthnFailed": AuthnFailed,
"urn:oasis:names:tc:SAML:2.0:status:InvalidAttrNameOrValue": InvalidAttrNameOrValue,
"urn:oasis:names:tc:SAML:2.0:status:InvalidNameIDPolicy": InvalidNameIDPolicy,
"urn:oasis:names:tc:SAML:2.0:status:NoAuthnContext": NoAuthnContext,
"urn:oasis:names:tc:SAML:2.0:status:NoAvailableIDP": NoAvailableIDP,
"urn:oasis:names:tc:SAML:2.0:status:NoPassive": NoPassive,
"urn:oasis:names:tc:SAML:2.0:status:NoSupportedIDP": NoSupportedIDP,
"urn:oasis:names:tc:SAML:2.0:status:PartialLogout": PartialLogout,
"urn:oasis:names:tc:SAML:2.0:status:ProxyCountExceeded": ProxyCountExceeded,
"urn:oasis:names:tc:SAML:2.0:status:RequestDenied": RequestDenied,
"urn:oasis:names:tc:SAML:2.0:status:RequestUnsupported": RequestUnsupported,
"urn:oasis:names:tc:SAML:2.0:status:RequestVersionDeprecated": RequestVersionDeprecated,
"urn:oasis:names:tc:SAML:2.0:status:RequestVersionTooLow": RequestVersionTooLow,
"urn:oasis:names:tc:SAML:2.0:status:ResourceNotRecognized": ResourceNotRecognized,
"urn:oasis:names:tc:SAML:2.0:status:TooManyResponses": TooManyResponses,
"urn:oasis:names:tc:SAML:2.0:status:UnknownAttrProfile": UnknownAttrProfile,
"urn:oasis:names:tc:SAML:2.0:status:UnknownPrincipal": UnknownPrincipal,
"urn:oasis:names:tc:SAML:2.0:status:UnsupportedBinding": UnsupportedBinding,
}
type resp struct {
response *Response
rawResp string
}
func (r *resp) setResponse(val *Response) {
r.response = val
}
func (r resp) statusDescription() string {
if r.response != nil {
return r.response.Status.StatusCode.Value
}
return "missing response"
}
func (r resp) UserID() string {
if r.response != nil {
return r.response.Assertion.Subject.NameID.Value
}
return ""
}
func (r resp) status() (int, error) {
if r.response != nil {
statusURI := r.response.Status.StatusCode.Value
if code, ok := statusMap[statusURI]; ok {
return code, nil
}
}
return AuthnFailed, errors.New("malformed or missing auth response")
}
func (r resp) RequestID() string {
if r.response != nil {
return r.response.InResponseTo
}
return ""
}
func (r resp) rawResponse() string {
return r.rawResp
}
func (r resp) authResponse() (*Response, error) {
if r.response != nil {
return r.response, nil
}
return nil, errors.New("missing SAML response")
}
// DecodeAuthResponse extracts SAML assertions from IDP response
func DecodeAuthResponse(samlResponse string) (kolide.Auth, error) {
var authInfo resp
authInfo.rawResp = samlResponse
decoded, err := base64.StdEncoding.DecodeString(samlResponse)
if err != nil {
return nil, errors.Wrap(err, "decoding saml response")
}
var saml Response
err = xml.NewDecoder(bytes.NewBuffer(decoded)).Decode(&saml)
if err != nil {
return nil, errors.Wrap(err, "decoding response xml")
}
authInfo.response = &saml
return &authInfo, nil
}
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