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package controllers
import (
"bytes"
"net/http"
"text/template"
"time"
"code.crute.us/mcrute/cloud-identity-broker/cloud/aws"
"code.crute.us/mcrute/golib/echo/controller"
"github.com/labstack/echo/v4"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promauto"
)
var credsAllowed = promauto.NewCounterVec(prometheus.CounterOpts{
Namespace: "aws_access", // Legacy namespace
Name: "broker_cred_access_total",
Help: "Total number of credential accesses allowed by broker",
}, []string{"account", "region"})
type jsonCredential struct {
AccessKeyId *string `json:"access_key"`
SecretAccessKey *string `json:"secret_key"`
SessionToken *string `json:"session_token"`
Expiration *time.Time `json:"expiration"`
ShortName string `json:"-"`
}
var (
bashTemplate = template.Must(template.New("").Parse(
`export AWS_CREDS_EXPIRATION="{{ .Expiration }}"
export AWS_ACCESS_KEY_ID="{{ .AccessKeyId }}"
export AWS_SECRET_ACCESS_KEY="{{ .SecretAccessKey }}"
export AWS_SESSION_TOKEN="{{ .SessionToken }}"
`))
pslTemplate = template.Must(template.New("").Parse(
`Set-Item -path env:AWS_CREDS_EXPIRATION -value '{{ .Expiration }}'
Set-Item -path env:AWS_ACCESS_KEY_ID -value '{{ .AccessKeyId }}'
Set-Item -path env:AWS_SECRET_ACCESS_KEY -value '{{ .SecretAccessKey }}'
Set-Item -path env:AWS_SESSION_TOKEN -value '{{ .SessionToken }}'
`))
iniTemplate = template.Must(template.New("").Parse(
`[profile {{ .ShortName }}]
aws_access_key_id={{ .AccessKeyId }}
aws_secret_access_key={{ .SecretAccessKey }}
aws_session_token={{ .SessionToken }}
expiration={{ .Expiration }}
`))
)
type APICredentialsHandler struct {
*AWSAPI
}
func NewAPICredentialsHandler(a *AWSAPI) echo.HandlerFunc {
al := &APICredentialsHandler{a}
h := &controller.ContentTypeNegotiatingHandler{
DefaultHandler: al.HandleJSONV1,
Handlers: map[string]echo.HandlerFunc{
contentTypeV1: al.HandleJSONV1,
contentTypeV2: al.HandleJSONV1,
contentTypeV2AWSBash: al.HandleBashV2,
contentTypeV2AWSPowershell: al.HandlePSLV2,
contentTypeV2AWSConfig: al.HandleINIV2,
},
}
return h.Handle
}
func (h *APICredentialsHandler) getAWSCredential(c echo.Context) (*jsonCredential, error) {
rc, err := h.GetContext(c) // Does authorization checks
if err != nil {
return nil, err
}
region := c.Param("region")
creds, err := rc.AWS.AssumeRole(rc.Principal.Username, ®ion)
if err != nil {
if aws.IsRegionNotExist(err) {
return nil, echo.NotFoundHandler(c)
}
c.Logger().Errorf("Error retrieving credentials: %w", err)
return nil, echo.ErrInternalServerError
}
c.Logger().Infof(
"Allowing '%s' to access account credential '%s'",
rc.Principal.Username, rc.Account.Name,
)
credsAllowed.With(prometheus.Labels{
"account": rc.Account.ShortName,
"region": region,
}).Inc()
c.Response().Header().Set("Expires", creds.Expiration.Add(-5*time.Minute).Format(time.RFC1123))
return &jsonCredential{
AccessKeyId: creds.AccessKeyId,
SecretAccessKey: creds.SecretAccessKey,
SessionToken: creds.SessionToken,
Expiration: creds.Expiration,
ShortName: rc.Account.ShortName,
}, nil
}
func (h *APICredentialsHandler) renderTemplate(c echo.Context, t *template.Template, ct string) error {
creds, err := h.getAWSCredential(c)
if err != nil {
return err
}
buf := &bytes.Buffer{}
if err = t.Execute(buf, creds); err != nil {
return echo.ErrInternalServerError
}
return c.Blob(http.StatusOK, ct, buf.Bytes())
}
func (h *APICredentialsHandler) HandleJSONV1(c echo.Context) error {
creds, err := h.getAWSCredential(c)
if err != nil {
return err
}
return c.JSON(http.StatusOK, creds)
}
func (h *APICredentialsHandler) HandleBashV2(c echo.Context) error {
return h.renderTemplate(c, bashTemplate, contentTypeV2AWSBash)
}
func (h *APICredentialsHandler) HandlePSLV2(c echo.Context) error {
return h.renderTemplate(c, pslTemplate, contentTypeV2AWSPowershell)
}
func (h *APICredentialsHandler) HandleINIV2(c echo.Context) error {
return h.renderTemplate(c, iniTemplate, contentTypeV2AWSConfig)
}
|
