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authn.go
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authn.go
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//
// Copyright The Athenz Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package sia
import (
"encoding/json"
"github.com/AthenZ/athenz/libs/go/sia/aws/options"
"github.com/AthenZ/athenz/libs/go/sia/util"
"log"
"os"
"time"
"github.com/AthenZ/athenz/libs/go/sia/aws/meta"
)
func getDocValue(docMap map[string]interface{}, key string) string {
value := docMap[key]
if value == nil {
return ""
} else {
return value.(string)
}
}
func GetEC2DocumentDetails(metaEndPoint string) ([]byte, []byte, string, string, string, string, *time.Time, error) {
document, err := meta.GetData(metaEndPoint, "/latest/dynamic/instance-identity/document")
if err != nil {
return nil, nil, "", "", "", "", nil, err
}
signature, err := meta.GetData(metaEndPoint, "/latest/dynamic/instance-identity/pkcs7")
if err != nil {
return nil, nil, "", "", "", "", nil, err
}
var docMap map[string]interface{}
err = json.Unmarshal(document, &docMap)
if err != nil {
return nil, nil, "", "", "", "", nil, err
}
account := getDocValue(docMap, "accountId")
region := getDocValue(docMap, "region")
instanceId := getDocValue(docMap, "instanceId")
privateIp := getDocValue(docMap, "privateIp")
timeCheck, _ := time.Parse(time.RFC3339, getDocValue(docMap, "pendingTime"))
return document, signature, account, instanceId, region, privateIp, &timeCheck, err
}
func GetEC2PublicIP(metaEndPoint string) (string, error) {
publicIP, err := meta.GetData(metaEndPoint, "/latest/meta-data/public-ipv4")
if err != nil {
return "", err
}
return string(publicIP), nil
}
func GetECSOnEC2TaskId() string {
ecs := os.Getenv("ECS_CONTAINER_METADATA_FILE")
if ecs == "" {
log.Println("Not ECS on EC2 instance")
return ""
}
ecsMetaData, err := os.ReadFile(ecs)
if err != nil {
log.Printf("Unable to read ECS on EC2 instance metadata: %s - %v\n", ecs, err)
return ""
}
var docMap map[string]interface{}
err = json.Unmarshal(ecsMetaData, &docMap)
if err != nil {
log.Printf("Unable to parse ECS on EC2 instance metadata: %s - %v\n", ecs, err)
return ""
}
taskArn := getDocValue(docMap, "TaskARN")
_, taskId, _, err := util.ParseTaskArn(taskArn)
if err != nil {
log.Printf("Unable to parse ECS on EC2 task id: %s - %v\n", taskArn, err)
return ""
}
return taskId
}
func GetEC2Config(configFile, profileConfigFile, profileRestrictToKey, metaEndpoint string, useRegionalSTS bool, region, account string) (*options.Config, *options.ConfigAccount, *options.AccessProfileConfig, error) {
config, configAccount, err := options.InitFileConfig(configFile, metaEndpoint, useRegionalSTS, region, account)
if err != nil {
log.Printf("Unable to process configuration file '%s': %v\n", configFile, err)
log.Println("Trying to determine service details from the environment variables...")
config, configAccount, err = options.InitEnvConfig(config)
if err != nil {
log.Printf("Unable to process environment settings: %v\n", err)
// if we do not have settings in our environment, we're going
// to use fallback to <domain>.<service>-service naming structure
log.Println("Trying to determine service name security credentials...")
configAccount, _, err = options.InitCredsConfig("-service", "@", useRegionalSTS, region)
if err != nil {
log.Printf("Unable to process security credentials: %v\n", err)
log.Println("Trying to determine service name from profile arn...")
configAccount, _, err = options.InitProfileConfig(metaEndpoint, "-service", "@")
if err != nil {
return config, nil, nil, err
}
}
}
}
profileConfig, err := GetEC2AccessProfile(profileConfigFile, profileRestrictToKey, metaEndpoint, useRegionalSTS, region)
if err != nil {
log.Printf("Unable to determine profile information: %v\n", err)
}
return config, configAccount, profileConfig, nil
}
func GetEC2AccessProfile(configFile, profileRestrictToKey, metaEndpoint string, useRegionalSTS bool, region string) (*options.AccessProfileConfig, error) {
accessProfileConfig, err := options.InitAccessProfileFileConfig(configFile)
if err != nil {
log.Printf("Unable to process configuration file '%s': %v\n", configFile, err)
log.Println("Trying to determine profile details from the environment variables...")
accessProfileConfig, err = options.InitAccessProfileEnvConfig()
if err != nil {
log.Printf("Unable to process environment settings: %v\n", err)
// if we do not have settings in our environment, we're going
// to use fallback to <domain>.<service>-service@access-profile naming structure
log.Println("Trying to determine profile name from security credentials...")
_, accessProfileConfig, err = options.InitCredsConfig("-service", "@", useRegionalSTS, region)
// if the profile is empty try to determine access profile info from instance profile
if accessProfileConfig == nil || accessProfileConfig.Profile == "" {
if err != nil {
log.Printf("Unable to obtain access profile info from security credentials, err: %v\n", err)
}
log.Println("Trying to determine access profile details from instance profile arn...")
_, accessProfileConfig, err = options.InitProfileConfig(metaEndpoint, "-service", "@")
if err != nil {
return nil, err
}
}
}
}
// If tags is not provided through file then check if value is provided through ec2 instance tags
if accessProfileConfig.ProfileRestrictTo == "" && profileRestrictToKey != "" {
log.Printf("Trying to determine profile tag value %v from instance tags\n", profileRestrictToKey)
value, err := options.GetInstanceTagValue(metaEndpoint, profileRestrictToKey)
if err == nil {
accessProfileConfig.ProfileRestrictTo = value
}
}
return accessProfileConfig, err
}