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|
package client
import (
"bytes"
"context"
"fmt"
"crypto/ed25519"
"crypto/tls"
"crypto/x509"
"encoding/base64"
"encoding/json"
"io/ioutil"
"net/http"
"github.com/golang/glog"
"github.com/google/trillian/merkle/rfc6962"
"github.com/system-transparency/stfe"
"github.com/system-transparency/stfe/descriptor"
"github.com/system-transparency/stfe/x509util"
"golang.org/x/net/context/ctxhttp"
)
// Client is an HTTP(S) client that talks to an ST log
type Client struct {
Log *descriptor.Log
Client *http.Client
Chain []*x509.Certificate
PrivateKey *ed25519.PrivateKey
useHttp bool
}
// NewClient returns a new log client
func NewClient(log *descriptor.Log, client *http.Client, useHttp bool, chain []*x509.Certificate, privateKey *ed25519.PrivateKey) *Client {
return &Client{
Log: log,
Chain: chain,
Client: client,
PrivateKey: privateKey,
useHttp: useHttp,
}
}
// NewClientFromPath loads necessary data from file before creating a new
// client, namely, a pem-encoded certificate chain, a pem-encoded ed25519
// private key, and a json-encoded list of log operators (see descriptor).
func NewClientFromPath(logId, chainPath, keyPath, operatorsPath string, cli *http.Client, useHttp bool) (*Client, error) {
c, err := x509util.LoadChain(chainPath)
if err != nil {
return nil, err
}
k, err := x509util.LoadEd25519SigningKey(keyPath)
if err != nil && keyPath != "" {
return nil, err
}
ops, err := descriptor.LoadOperators(operatorsPath)
if err != nil {
return nil, err
}
id, err := base64.StdEncoding.DecodeString(logId)
if err != nil {
return nil, fmt.Errorf("failed decoding log identifier: %v", err)
}
log, err := descriptor.FindLog(ops, id)
if err != nil {
return nil, err
}
return NewClient(log, cli, useHttp, c, &k), nil
}
// AddEntry creates, signs, and adds a new ChecksumV1 entry to the log
func (c *Client) AddEntry(ctx context.Context, name, checksum []byte) (*stfe.StItem, error) {
leaf, err := stfe.NewChecksumV1(name, checksum).Marshal()
if err != nil {
return nil, fmt.Errorf("failed marshaling StItem: %v", err)
}
data, err := json.Marshal(stfe.AddEntryRequest{
Item: leaf,
Signature: ed25519.Sign(*c.PrivateKey, leaf),
SignatureScheme: uint16(tls.Ed25519),
Chain: c.chain(),
})
if err != nil {
return nil, fmt.Errorf("failed creating post data: %v", err)
}
glog.V(3).Infof("created post data: %s", string(data))
req, err := http.NewRequest("POST", c.protocol()+c.Log.BaseUrl+"/add-entry", bytes.NewBuffer(data))
if err != nil {
return nil, fmt.Errorf("failed creating http request: %v", err)
}
req.Header.Set("Content-Type", "application/json")
glog.V(2).Infof("created http request: %s %s", req.Method, req.URL)
item, err := c.doRequestWithStItemResponse(ctx, req)
if err != nil {
return nil, err
}
if item.Format != stfe.StFormatSignedDebugInfoV1 {
return nil, fmt.Errorf("bad StItem format: %v", item.Format)
}
if err := VerifySignedDebugInfoV1(item, c.Log.Scheme, c.Log.Key(), leaf); err != nil {
return nil, fmt.Errorf("bad SignedDebugInfoV1 signature: %v", err)
}
return item, nil
}
func (c *Client) GetSth(ctx context.Context) (*stfe.StItem, error) {
req, err := http.NewRequest("GET", c.protocol()+c.Log.BaseUrl+"/get-sth", nil)
if err != nil {
return nil, fmt.Errorf("failed creating http request: %v", err)
}
glog.V(2).Infof("created http request: %s %s", req.Method, req.URL)
item, err := c.doRequestWithStItemResponse(ctx, req)
if err != nil {
return nil, err
}
if item.Format != stfe.StFormatSignedTreeHeadV1 {
return nil, fmt.Errorf("bad StItem format: %v", item.Format)
}
if err := VerifySignedTreeHeadV1(item, c.Log.Scheme, c.Log.Key()); err != nil {
return nil, fmt.Errorf("bad SignedDebugInfoV1 signature: %v", err)
}
return item, nil
}
func (c *Client) GetConsistencyProof(ctx context.Context, first, second *stfe.StItem) (*stfe.StItem, error) {
req, err := http.NewRequest("GET", c.protocol()+c.Log.BaseUrl+"/get-consistency-proof", nil)
if err != nil {
return nil, fmt.Errorf("failed creating http request: %v", err)
}
req.Header.Set("Content-Type", "application/json")
q := req.URL.Query()
q.Add("first", fmt.Sprintf("%d", first.SignedTreeHeadV1.TreeHead.TreeSize))
q.Add("second", fmt.Sprintf("%d", second.SignedTreeHeadV1.TreeHead.TreeSize))
req.URL.RawQuery = q.Encode()
glog.V(2).Infof("created http request: %s %s", req.Method, req.URL)
item, err := c.doRequestWithStItemResponse(ctx, req)
if err != nil {
return nil, err
}
if item.Format != stfe.StFormatConsistencyProofV1 {
return nil, fmt.Errorf("bad StItem format: %v", item.Format)
}
if err := VerifyConsistencyProofV1(item, first, second); err != nil {
return nil, fmt.Errorf("bad consistency proof: %v", err)
}
return item, nil
}
func (c *Client) GetProofByHash(ctx context.Context, treeSize uint64, rootHash, leaf []byte) (*stfe.StItem, error) {
leafHash := rfc6962.DefaultHasher.HashLeaf(leaf)
req, err := http.NewRequest("GET", c.protocol()+c.Log.BaseUrl+"/get-proof-by-hash", nil)
if err != nil {
return nil, fmt.Errorf("failed creating http request: %v", err)
}
req.Header.Set("Content-Type", "application/json")
q := req.URL.Query()
q.Add("hash", base64.StdEncoding.EncodeToString(leafHash))
q.Add("tree_size", fmt.Sprintf("%d", treeSize))
req.URL.RawQuery = q.Encode()
glog.V(2).Infof("created http request: %s %s", req.Method, req.URL)
item, err := c.doRequestWithStItemResponse(ctx, req)
if err != nil {
return nil, err
}
if item.Format != stfe.StFormatInclusionProofV1 {
return nil, fmt.Errorf("bad StItem format: %v", item.Format)
}
if err := VerifyInclusionProofV1(item, rootHash, leafHash); err != nil {
return nil, fmt.Errorf("bad inclusion proof: %v", err)
}
return item, nil
}
func (c *Client) GetEntries(ctx context.Context, start, end uint64) (*stfe.StItem, error) {
return nil, fmt.Errorf("TODO: Client.GetEntries()")
}
func (c *Client) GetAnchors(ctx context.Context, start, end uint64) ([]*x509.Certificate, error) {
return nil, fmt.Errorf("TODO: Client.GetAnchors()")
}
func (c *Client) chain() [][]byte {
chain := make([][]byte, 0, len(c.Chain))
for _, cert := range c.Chain {
chain = append(chain, cert.Raw)
}
return chain
}
// doRequest sends an HTTP request and decodes the resulting json body into out
func (c *Client) doRequest(ctx context.Context, req *http.Request, out interface{}) error {
rsp, err := ctxhttp.Do(ctx, c.Client, req)
if err != nil {
return fmt.Errorf("http request failed: %v", err)
}
body, err := ioutil.ReadAll(rsp.Body)
rsp.Body.Close()
if err != nil {
return fmt.Errorf("http body read failed: %v", err)
}
if rsp.StatusCode != http.StatusOK {
return fmt.Errorf("http status code not ok: %v", rsp.StatusCode)
}
if err := json.Unmarshal(body, out); err != nil {
return fmt.Errorf("failed decoding json body: %v", err)
}
return nil
}
// doRequestWithStItemResponse sends an HTTP request and returns a decoded
// StItem that the resulting HTTP response contained json:ed and marshaled
func (c *Client) doRequestWithStItemResponse(ctx context.Context, req *http.Request) (*stfe.StItem, error) {
var itemStr string
if err := c.doRequest(ctx, req, &itemStr); err != nil {
return nil, err
}
b, err := base64.StdEncoding.DecodeString(itemStr)
if err != nil {
return nil, fmt.Errorf("failed decoding base64 body: %v", err)
}
var item stfe.StItem
if err := item.Unmarshal(b); err != nil {
return nil, fmt.Errorf("failed decoding StItem: %v", err)
}
glog.V(3).Infof("got StItem: %s", item)
return &item, nil
}
// protocol returns a protocol string that preceeds the log's base url
func (c *Client) protocol() string {
if c.useHttp {
return "http://"
}
return "https://"
}
|
