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client_certificate_authorizer.go
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client_certificate_authorizer.go
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package auth
import (
"context"
"fmt"
"os"
"github.com/hashicorp/go-azure-sdk/sdk/environments"
"golang.org/x/crypto/pkcs12"
)
type ClientCertificateAuthorizerOptions struct {
// Environment is the Azure environment/cloud being targeted
Environment environments.Environment
// Api describes the Azure API being used
Api environments.Api
// TenantId is the tenant to authenticate against
TenantId string
// AuxTenantIds lists additional tenants to authenticate against, currently only
// used for Resource Manager when auxiliary tenants are needed.
// e.g. https://learn.microsoft.com/en-us/azure/azure-resource-manager/management/authenticate-multi-tenant
AuxTenantIds []string
// ClientId is the client ID used when authenticating
ClientId string
// Pkcs12Data is the binary PKCS#12 archive data containing the certificate and private key
Pkcs12Data []byte
// Pkcs12Path is a path to a binary PKCS#12 archive on the filesystem
Pkcs12Path string
// Pkcs12Pass is the challenge passphrase to decrypt the PKCS#12 archive
Pkcs12Pass string
}
// NewClientCertificateAuthorizer returns an authorizer which uses client certificate authentication.
func NewClientCertificateAuthorizer(ctx context.Context, options ClientCertificateAuthorizerOptions) (Authorizer, error) {
if len(options.Pkcs12Data) == 0 {
var err error
options.Pkcs12Data, err = os.ReadFile(options.Pkcs12Path)
if err != nil {
return nil, fmt.Errorf("could not read PKCS#12 archive at %q: %s", options.Pkcs12Path, err)
}
}
key, cert, err := pkcs12.Decode(options.Pkcs12Data, options.Pkcs12Pass)
if err != nil {
return nil, fmt.Errorf("could not decode PKCS#12 archive: %s", err)
}
scope, err := environments.Scope(options.Api)
if err != nil {
return nil, fmt.Errorf("determining scope for %q: %+v", options.Api.Name(), err)
}
conf := clientCredentialsConfig{
Environment: options.Environment,
TenantID: options.TenantId,
AuxiliaryTenantIDs: options.AuxTenantIds,
ClientID: options.ClientId,
PrivateKey: key,
Certificate: cert,
Scopes: []string{
*scope,
},
}
return conf.TokenSource(ctx, clientCredentialsAssertionType)
}