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workspaceresourceauth.go
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/
workspaceresourceauth.go
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package coderd
import (
"database/sql"
"encoding/json"
"errors"
"fmt"
"net/http"
"github.com/coder/coder/coderd/awsidentity"
"github.com/coder/coder/coderd/azureidentity"
"github.com/coder/coder/coderd/database"
"github.com/coder/coder/coderd/httpapi"
"github.com/coder/coder/coderd/provisionerdserver"
"github.com/coder/coder/codersdk"
"github.com/mitchellh/mapstructure"
)
// Azure supports instance identity verification:
// https://docs.microsoft.com/en-us/azure/virtual-machines/windows/instance-metadata-service?tabs=linux#tabgroup_14
func (api *API) postWorkspaceAuthAzureInstanceIdentity(rw http.ResponseWriter, r *http.Request) {
ctx := r.Context()
var req codersdk.AzureInstanceIdentityToken
if !httpapi.Read(ctx, rw, r, &req) {
return
}
instanceID, err := azureidentity.Validate(ctx, req.Signature, api.AzureCertificates)
if err != nil {
httpapi.Write(ctx, rw, http.StatusUnauthorized, codersdk.Response{
Message: "Invalid Azure identity.",
Detail: err.Error(),
})
return
}
api.handleAuthInstanceID(rw, r, instanceID)
}
// AWS supports instance identity verification:
// https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/instance-identity-documents.html
// Using this, we can exchange a signed instance payload for an agent token.
func (api *API) postWorkspaceAuthAWSInstanceIdentity(rw http.ResponseWriter, r *http.Request) {
ctx := r.Context()
var req codersdk.AWSInstanceIdentityToken
if !httpapi.Read(ctx, rw, r, &req) {
return
}
identity, err := awsidentity.Validate(req.Signature, req.Document, api.AWSCertificates)
if err != nil {
httpapi.Write(ctx, rw, http.StatusUnauthorized, codersdk.Response{
Message: "Invalid AWS identity.",
Detail: err.Error(),
})
return
}
api.handleAuthInstanceID(rw, r, identity.InstanceID)
}
// Google Compute Engine supports instance identity verification:
// https://cloud.google.com/compute/docs/instances/verifying-instance-identity
// Using this, we can exchange a signed instance payload for an agent token.
func (api *API) postWorkspaceAuthGoogleInstanceIdentity(rw http.ResponseWriter, r *http.Request) {
ctx := r.Context()
var req codersdk.GoogleInstanceIdentityToken
if !httpapi.Read(ctx, rw, r, &req) {
return
}
// We leave the audience blank. It's not important we validate who made the token.
payload, err := api.GoogleTokenValidator.Validate(ctx, req.JSONWebToken, "")
if err != nil {
httpapi.Write(ctx, rw, http.StatusUnauthorized, codersdk.Response{
Message: "Invalid GCP identity.",
Detail: err.Error(),
})
return
}
claims := struct {
Google struct {
ComputeEngine struct {
InstanceID string `mapstructure:"instance_id"`
} `mapstructure:"compute_engine"`
} `mapstructure:"google"`
}{}
err = mapstructure.Decode(payload.Claims, &claims)
if err != nil {
httpapi.Write(ctx, rw, http.StatusBadRequest, codersdk.Response{
Message: "Error decoding JWT claims.",
Detail: err.Error(),
})
return
}
api.handleAuthInstanceID(rw, r, claims.Google.ComputeEngine.InstanceID)
}
func (api *API) handleAuthInstanceID(rw http.ResponseWriter, r *http.Request, instanceID string) {
ctx := r.Context()
agent, err := api.Database.GetWorkspaceAgentByInstanceID(ctx, instanceID)
if errors.Is(err, sql.ErrNoRows) {
httpapi.Write(ctx, rw, http.StatusNotFound, codersdk.Response{
Message: fmt.Sprintf("Instance with id %q not found.", instanceID),
})
return
}
if err != nil {
httpapi.Write(ctx, rw, http.StatusInternalServerError, codersdk.Response{
Message: "Internal error fetching provisioner job agent.",
Detail: err.Error(),
})
return
}
resource, err := api.Database.GetWorkspaceResourceByID(ctx, agent.ResourceID)
if err != nil {
httpapi.Write(ctx, rw, http.StatusInternalServerError, codersdk.Response{
Message: "Internal error fetching provisioner job resource.",
Detail: err.Error(),
})
return
}
job, err := api.Database.GetProvisionerJobByID(ctx, resource.JobID)
if err != nil {
httpapi.Write(ctx, rw, http.StatusInternalServerError, codersdk.Response{
Message: "Internal error fetching provisioner job.",
Detail: err.Error(),
})
return
}
if job.Type != database.ProvisionerJobTypeWorkspaceBuild {
httpapi.Write(ctx, rw, http.StatusBadRequest, codersdk.Response{
Message: fmt.Sprintf("%q jobs cannot be authenticated.", job.Type),
})
return
}
var jobData provisionerdserver.WorkspaceProvisionJob
err = json.Unmarshal(job.Input, &jobData)
if err != nil {
httpapi.Write(ctx, rw, http.StatusInternalServerError, codersdk.Response{
Message: "Internal error extracting job data.",
Detail: err.Error(),
})
return
}
resourceHistory, err := api.Database.GetWorkspaceBuildByID(ctx, jobData.WorkspaceBuildID)
if err != nil {
httpapi.Write(ctx, rw, http.StatusInternalServerError, codersdk.Response{
Message: "Internal error fetching workspace build.",
Detail: err.Error(),
})
return
}
// This token should only be exchanged if the instance ID is valid
// for the latest history. If an instance ID is recycled by a cloud,
// we'd hate to leak access to a user's workspace.
latestHistory, err := api.Database.GetLatestWorkspaceBuildByWorkspaceID(ctx, resourceHistory.WorkspaceID)
if err != nil {
httpapi.Write(ctx, rw, http.StatusInternalServerError, codersdk.Response{
Message: "Internal error fetching the latest workspace build.",
Detail: err.Error(),
})
return
}
if latestHistory.ID != resourceHistory.ID {
httpapi.Write(ctx, rw, http.StatusBadRequest, codersdk.Response{
Message: fmt.Sprintf("Resource found for id %q, but isn't registered on the latest history.", instanceID),
})
return
}
httpapi.Write(ctx, rw, http.StatusOK, codersdk.WorkspaceAgentAuthenticateResponse{
SessionToken: agent.AuthToken.String(),
})
}