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package image
import (
"encoding/base64"
"encoding/json"
"fmt"
"os"
"os/exec"
"strings"
"time"
argoexec "github.com/argoproj/pkg/exec"
"github.com/argoproj-labs/argocd-image-updater/registry-scanner/pkg/kube"
"github.com/argoproj-labs/argocd-image-updater/registry-scanner/pkg/log"
)
type CredentialSourceType int
const (
CredentialSourceUnknown CredentialSourceType = 0
CredentialSourcePullSecret CredentialSourceType = 1
CredentialSourceSecret CredentialSourceType = 2
CredentialSourceEnv CredentialSourceType = 3
CredentialSourceExt CredentialSourceType = 4
)
type CredentialSource struct {
Type CredentialSourceType
Registry string
SecretNamespace string
SecretName string
SecretField string
EnvName string
ScriptPath string
}
type Credential struct {
Username string
Password string
}
const pullSecretField = ".dockerconfigjson"
// gcr.io=secret:foo/bar#baz
// gcr.io=pullsecret:foo/bar
// gcr.io=env:FOOBAR
func ParseCredentialSource(credentialSource string, requirePrefix bool) (*CredentialSource, error) {
src := CredentialSource{}
var secretDef string
tokens := strings.SplitN(credentialSource, "=", 2)
if len(tokens) != 2 || tokens[0] == "" || tokens[1] == "" {
if requirePrefix {
return nil, fmt.Errorf("invalid credential spec: %s", credentialSource)
}
secretDef = credentialSource
} else {
src.Registry = tokens[0]
secretDef = tokens[1]
}
tokens = strings.Split(secretDef, ":")
if len(tokens) != 2 || tokens[0] == "" || tokens[1] == "" {
return nil, fmt.Errorf("invalid credential spec: %s", credentialSource)
}
var err error
switch strings.ToLower(tokens[0]) {
case "secret":
err = src.parseSecretDefinition(tokens[1])
src.Type = CredentialSourceSecret
case "pullsecret":
err = src.parsePullSecretDefinition(tokens[1])
src.Type = CredentialSourcePullSecret
case "env":
err = src.parseEnvDefinition(tokens[1])
src.Type = CredentialSourceEnv
case "ext":
err = src.parseExtDefinition(tokens[1])
src.Type = CredentialSourceExt
default:
err = fmt.Errorf("unknown credential source: %s", tokens[0])
}
if err != nil {
return nil, err
}
return &src, nil
}
// FetchCredentials fetches the credentials for a given registry according to
// the credential source.
func (src *CredentialSource) FetchCredentials(registryURL string, kubeclient *kube.KubernetesClient) (*Credential, error) {
var creds Credential
log.Tracef("Fetching credentials for registry %s", registryURL)
switch src.Type {
case CredentialSourceEnv:
credEnv := os.Getenv(src.EnvName)
if credEnv == "" {
return nil, fmt.Errorf("could not fetch credentials: env '%s' is not set", src.EnvName)
}
tokens := strings.SplitN(credEnv, ":", 2)
if len(tokens) != 2 || tokens[0] == "" || tokens[1] == "" {
return nil, fmt.Errorf("could not fetch credentials: value of %s is malformed", src.EnvName)
}
creds.Username = tokens[0]
creds.Password = tokens[1]
return &creds, nil
case CredentialSourceSecret:
if kubeclient == nil {
return nil, fmt.Errorf("could not fetch credentials: no Kubernetes client given")
}
data, err := kubeclient.GetSecretField(src.SecretNamespace, src.SecretName, src.SecretField)
if err != nil {
return nil, fmt.Errorf("could not fetch secret '%s' from namespace '%s' (field: '%s'): %v", src.SecretName, src.SecretNamespace, src.SecretField, err)
}
tokens := strings.SplitN(data, ":", 2)
if len(tokens) != 2 {
return nil, fmt.Errorf("invalid credentials in secret '%s' from namespace '%s' (field '%s')", src.SecretName, src.SecretNamespace, src.SecretField)
}
creds.Username = tokens[0]
creds.Password = tokens[1]
return &creds, nil
case CredentialSourcePullSecret:
if kubeclient == nil {
return nil, fmt.Errorf("could not fetch credentials: no Kubernetes client given")
}
src.SecretField = pullSecretField
data, err := kubeclient.GetSecretField(src.SecretNamespace, src.SecretName, src.SecretField)
if err != nil {
return nil, fmt.Errorf("could not fetch secret '%s' from namespace '%s' (field: '%s'): %v", src.SecretName, src.SecretNamespace, src.SecretField, err)
}
creds.Username, creds.Password, err = parseDockerConfigJson(registryURL, data)
if err != nil {
return nil, err
}
return &creds, nil
case CredentialSourceExt:
if !strings.HasPrefix(src.ScriptPath, "/") {
return nil, fmt.Errorf("path to script must be absolute, but is '%s'", src.ScriptPath)
}
_, err := os.Stat(src.ScriptPath)
if err != nil {
return nil, fmt.Errorf("could not stat %s: %v", src.ScriptPath, err)
}
cmd := exec.Command(src.ScriptPath)
out, err := argoexec.RunCommandExt(cmd, argoexec.CmdOpts{Timeout: 10 * time.Second})
if err != nil {
return nil, fmt.Errorf("error executing %s: %v", src.ScriptPath, err)
}
tokens := strings.SplitN(out, ":", 2)
if len(tokens) != 2 {
return nil, fmt.Errorf("invalid script output, must be single line with syntax <username>:<password>")
}
creds.Username = tokens[0]
creds.Password = tokens[1]
return &creds, nil
default:
return nil, fmt.Errorf("unknown credential type")
}
}
// Parse a secret definition in form of 'namespace/name#field'
func (src *CredentialSource) parseSecretDefinition(definition string) error {
tokens := strings.Split(definition, "#")
if len(tokens) != 2 || tokens[0] == "" || tokens[1] == "" {
return fmt.Errorf("invalid secret definition: %s", definition)
}
src.SecretField = tokens[1]
tokens = strings.Split(tokens[0], "/")
if len(tokens) != 2 || tokens[0] == "" || tokens[1] == "" {
return fmt.Errorf("invalid secret definition: %s", definition)
}
src.SecretNamespace = tokens[0]
src.SecretName = tokens[1]
return nil
}
// Parse an image pull secret definition in form of 'namespace/name'
func (src *CredentialSource) parsePullSecretDefinition(definition string) error {
tokens := strings.Split(definition, "/")
if len(tokens) != 2 || tokens[0] == "" || tokens[1] == "" {
return fmt.Errorf("invalid secret definition: %s", definition)
}
src.SecretNamespace = tokens[0]
src.SecretName = tokens[1]
src.SecretField = pullSecretField
return nil
}
// Parse an environment definition
// nolint:unparam
func (src *CredentialSource) parseEnvDefinition(definition string) error {
src.EnvName = definition
return nil
}
// Parse an external script definition
// nolint:unparam
func (src *CredentialSource) parseExtDefinition(definition string) error {
src.ScriptPath = definition
return nil
}
// This unmarshals & parses Docker's config.json file, returning username and
// password for given registry URL
func parseDockerConfigJson(registryURL string, jsonSource string) (string, string, error) {
var dockerConf map[string]interface{}
err := json.Unmarshal([]byte(jsonSource), &dockerConf)
if err != nil {
return "", "", err
}
auths, ok := dockerConf["auths"].(map[string]interface{})
if !ok {
return "", "", fmt.Errorf("no credentials in image pull secret")
}
var regPrefix string
if strings.HasPrefix(registryURL, "http://") {
regPrefix = strings.TrimPrefix(registryURL, "http://")
} else if strings.HasPrefix(registryURL, "https://") {
regPrefix = strings.TrimPrefix(registryURL, "https://")
} else {
regPrefix = registryURL
}
regPrefix = strings.TrimSuffix(regPrefix, "/")
for registry, authConf := range auths {
if !strings.HasPrefix(registry, registryURL) && !strings.HasPrefix(registry, regPrefix) {
log.Tracef("found registry %s in image pull secret, but we want %s (%s) - skipping", registry, registryURL, regPrefix)
continue
}
authEntry, ok := authConf.(map[string]interface{})
if !ok {
return "", "", fmt.Errorf("invalid auth entry for registry entry %s ('auths' entry should be map)", registry)
}
authString, ok := authEntry["auth"].(string)
if !ok {
return "", "", fmt.Errorf("invalid auth token for registry entry %s ('auth' should be string')", registry)
}
authToken, err := base64.StdEncoding.DecodeString(authString)
if err != nil {
return "", "", fmt.Errorf("could not base64-decode auth data for registry entry %s: %v", registry, err)
}
tokens := strings.SplitN(string(authToken), ":", 2)
if len(tokens) != 2 {
return "", "", fmt.Errorf("invalid data after base64 decoding auth entry for registry entry %s", registry)
}
return tokens[0], tokens[1], nil
}
return "", "", fmt.Errorf("no valid auth entry for registry %s found in image pull secret", registryURL)
}
|
