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aws_account.go
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aws_account.go
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package saml2aws
import (
"bytes"
"fmt"
"io"
"net/http"
"net/url"
"github.com/PuerkitoBio/goquery"
"github.com/pkg/errors"
)
// AWSAccount holds the AWS account name and roles
type AWSAccount struct {
Name string
Roles []*AWSRole
}
// ParseAWSAccounts extract the aws accounts from the saml assertion
func ParseAWSAccounts(audience string, samlAssertion string) ([]*AWSAccount, error) {
res, err := http.PostForm(audience, url.Values{"SAMLResponse": {samlAssertion}})
if err != nil {
return nil, errors.Wrap(err, "error retrieving AWS login form")
}
data, err := io.ReadAll(res.Body)
if err != nil {
return nil, errors.Wrap(err, "error retrieving AWS login body")
}
return ExtractAWSAccounts(data)
}
// ExtractAWSAccounts extract the accounts from the AWS html page
func ExtractAWSAccounts(data []byte) ([]*AWSAccount, error) {
accounts := []*AWSAccount{}
doc, err := goquery.NewDocumentFromReader(bytes.NewBuffer(data))
if err != nil {
return nil, errors.Wrap(err, "failed to build document from response")
}
doc.Find("fieldset > div.saml-account").Each(func(i int, s *goquery.Selection) {
account := new(AWSAccount)
account.Name = s.Find("div.saml-account-name").Text()
s.Find("label").Each(func(i int, s *goquery.Selection) {
role := new(AWSRole)
role.Name = s.Text()
role.RoleARN, _ = s.Attr("for")
account.Roles = append(account.Roles, role)
})
accounts = append(accounts, account)
})
return accounts, nil
}
// AssignPrincipals assign principal from roles
func AssignPrincipals(awsRoles []*AWSRole, awsAccounts []*AWSAccount) {
awsPrincipalARNs := make(map[string]string)
for _, awsRole := range awsRoles {
awsPrincipalARNs[awsRole.RoleARN] = awsRole.PrincipalARN
}
for _, awsAccount := range awsAccounts {
for _, awsRole := range awsAccount.Roles {
awsRole.PrincipalARN = awsPrincipalARNs[awsRole.RoleARN]
}
}
}
// LocateRole locate role by name
func LocateRole(awsRoles []*AWSRole, roleName string) (*AWSRole, error) {
for _, awsRole := range awsRoles {
if awsRole.RoleARN == roleName {
return awsRole, nil
}
}
return nil, fmt.Errorf("Supplied RoleArn not found in saml assertion: %s", roleName)
}