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utils.go
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utils.go
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package lib
import (
"encoding/base64"
"encoding/xml"
"fmt"
"strings"
"github.com/segmentio/aws-okta/lib/saml"
"golang.org/x/net/html"
)
//TODO: Move those functions into saml package
func GetRoleFromSAML(resp *saml.Response, profileARN string) (string, string, error) {
for _, a := range resp.Assertion.AttributeStatement.Attributes {
if strings.HasSuffix(a.Name, "SAML/Attributes/Role") {
for _, v := range a.AttributeValues {
tokens := strings.Split(v.Value, ",")
if len(tokens) != 2 {
continue
}
// Amazon's documentation suggests that the
// Role ARN should appear first in the comma-delimited
// set in the Role Attribute that SAML IdP returns.
//
// See the section titled "An Attribute element with the Name attribute set
// to https://aws.amazon.com/SAML/Attributes/Role" on this page:
// https://docs.aws.amazon.com/IAM/latest/UserGuide/id_roles_providers_create_saml_assertions.html
//
// In practice, though, Okta SAML integrations with AWS will succeed
// with either the role or principal ARN first, and these `if` statements
// allow that behavior in this program.
if tokens[0] == profileARN {
// if true, Role attribute is formatted like:
// arn:aws:iam::account:role/roleName,arn:aws:iam::ACCOUNT:saml-provider/provider
return tokens[1], tokens[0], nil
} else if tokens[1] == profileARN {
// if true, Role attribute is formatted like:
// arn:aws:iam::ACCOUNT:saml-provider/provider,arn:aws:iam::account:role/roleName
return tokens[0], tokens[1], nil
}
}
}
}
return "", "", fmt.Errorf("Role '%s' not authorized by Okta. Contact Okta admin to make sure that the AWS app is configured properly.", profileARN)
}
func ParseSAML(body []byte, resp *SAMLAssertion) (err error) {
var val string
var data []byte
var doc *html.Node
doc, err = html.Parse(strings.NewReader(string(body)))
if err != nil {
return
}
val, _ = GetNode(doc, "SAMLResponse")
if val != "" {
resp.RawData = []byte(val)
val = strings.Replace(val, "+", "+", -1)
val = strings.Replace(val, "=", "=", -1)
data, err = base64.StdEncoding.DecodeString(val)
if err != nil {
return
}
}
err = xml.Unmarshal(data, &resp.Resp)
return
}
func GetNode(n *html.Node, name string) (val string, node *html.Node) {
var isMatch bool
if n.Type == html.ElementNode && n.Data == "input" {
for _, a := range n.Attr {
if a.Key == "name" && a.Val == name {
isMatch = true
}
if a.Key == "value" && isMatch {
val = a.Val
}
}
}
if node == nil || val == "" {
for c := n.FirstChild; c != nil; c = c.NextSibling {
val, node = GetNode(c, name)
if val != "" {
return
}
}
}
return
}