示例#1
0
func (f *dockerFetcher) fetch(u *url.URL) (*os.File, error) {
	tmpDir, err := f.getTmpDir()
	if err != nil {
		return nil, err
	}
	defer os.RemoveAll(tmpDir)

	registryURL := strings.TrimPrefix(u.String(), "docker://")
	user, password := f.getCreds(registryURL)
	// for now, always use https:// when fetching docker images
	acis, err := docker2aci.Convert(registryURL, true /* squash */, tmpDir, tmpDir, user, password, false /* insecure */)
	if err != nil {
		return nil, fmt.Errorf("error converting docker image to ACI: %v", err)
	}

	aciFile, err := os.Open(acis[0])
	if err != nil {
		return nil, fmt.Errorf("error opening squashed ACI file: %v", err)
	}

	return aciFile, nil
}
示例#2
0
// fetch opens/downloads and verifies the remote ACI.
// If appName is not "", it will be used to check that the manifest contain the correct appName
// If ascFile is not nil, it will be used as the signature file and ascURL will be ignored.
// If Keystore is nil signature verification will be skipped, regardless of ascFile.
// fetch returns the signer, an *os.File representing the ACI, and an error if any.
// err will be nil if the ACI fetches successfully and the ACI is verified.
func (f *fetcher) fetch(appName string, aciURL, ascURL string, ascFile *os.File, etag string) (*openpgp.Entity, *os.File, *cacheData, error) {
	var (
		entity *openpgp.Entity
		cd     *cacheData
	)

	u, err := url.Parse(aciURL)
	if err != nil {
		return nil, nil, nil, fmt.Errorf("error parsing ACI url: %v", err)
	}
	if u.Scheme == "docker" {
		registryURL := strings.TrimPrefix(aciURL, "docker://")

		tmpDir, err := f.s.TmpDir()
		if err != nil {
			return nil, nil, nil, fmt.Errorf("error creating temporary dir for docker to ACI conversion: %v", err)
		}

		indexName := docker2aci.GetIndexName(registryURL)
		user := ""
		password := ""
		if creds, ok := f.dockerAuth[indexName]; ok {
			user = creds.User
			password = creds.Password
		}
		acis, err := docker2aci.Convert(registryURL, true, tmpDir, tmpDir, user, password)
		if err != nil {
			return nil, nil, nil, fmt.Errorf("error converting docker image to ACI: %v", err)
		}

		aciFile, err := os.Open(acis[0])
		if err != nil {
			return nil, nil, nil, fmt.Errorf("error opening squashed ACI file: %v", err)
		}

		return nil, aciFile, nil, nil
	}

	var retrySignature bool
	if f.ks != nil && ascFile == nil {
		u, err := url.Parse(ascURL)
		if err != nil {
			return nil, nil, nil, fmt.Errorf("error parsing ASC url: %v", err)
		}
		if u.Scheme == "file" {
			ascFile, err = os.Open(u.Path)
			if err != nil {
				return nil, nil, nil, fmt.Errorf("error opening signature file: %v", err)
			}
		} else {
			stderr("Downloading signature from %v\n", ascURL)
			ascFile, err = f.s.TmpFile()
			if err != nil {
				return nil, nil, nil, fmt.Errorf("error setting up temporary file: %v", err)
			}
			defer os.Remove(ascFile.Name())

			err = f.downloadSignatureFile(ascURL, ascFile)
			switch err {
			case errStatusAccepted:
				retrySignature = true
				stderr("rkt: server requested deferring the signature download")
			case nil:
				break
			default:
				return nil, nil, nil, fmt.Errorf("error downloading the signature file: %v", err)
			}
		}
		defer ascFile.Close()
	}

	// check if the identity used by the signature is in the store before a
	// possibly expensive download. This is only an optimization and it's
	// ok to skip the test if the signature will be downloaded later.
	if !retrySignature && f.ks != nil && appName != "" {
		if _, err := ascFile.Seek(0, 0); err != nil {
			return nil, nil, nil, fmt.Errorf("error seeking signature file: %v", err)
		}
		if entity, err = f.ks.CheckSignature(appName, bytes.NewReader([]byte{}), ascFile); err != nil {
			if _, ok := err.(pgperrors.SignatureError); !ok {
				return nil, nil, nil, err
			}
		}
	}

	var aciFile *os.File
	if u.Scheme == "file" {
		aciFile, err = os.Open(u.Path)
		if err != nil {
			return nil, nil, nil, fmt.Errorf("error opening ACI file: %v", err)
		}
	} else {
		aciFile, err = f.s.TmpFile()
		if err != nil {
			return nil, aciFile, nil, fmt.Errorf("error setting up temporary file: %v", err)
		}
		defer os.Remove(aciFile.Name())

		if cd, err = f.downloadACI(aciURL, aciFile, etag); err != nil {
			return nil, nil, nil, fmt.Errorf("error downloading ACI: %v", err)
		}
		if cd.useCached {
			return nil, nil, cd, nil
		}
	}

	if retrySignature {
		if err = f.downloadSignatureFile(ascURL, ascFile); err != nil {
			return nil, aciFile, nil, fmt.Errorf("error downloading the signature file: %v", err)
		}
	}

	manifest, err := aci.ManifestFromImage(aciFile)
	if err != nil {
		return nil, aciFile, nil, err
	}
	// Check if the downloaded ACI has the correct app name.
	// The check is only performed when the aci is downloaded through the
	// discovery protocol, but not with local files or full URL.
	if appName != "" && manifest.Name.String() != appName {
		return nil, aciFile, nil,
			fmt.Errorf("error when reading the app name: %q expected but %q found",
				appName, manifest.Name.String())
	}

	if f.ks != nil {
		if _, err := aciFile.Seek(0, 0); err != nil {
			return nil, aciFile, nil, fmt.Errorf("error seeking ACI file: %v", err)
		}
		if _, err := ascFile.Seek(0, 0); err != nil {
			return nil, aciFile, nil, fmt.Errorf("error seeking signature file: %v", err)
		}
		if entity, err = f.ks.CheckSignature(manifest.Name.String(), aciFile, ascFile); err != nil {
			return nil, aciFile, nil, err
		}
	}

	if _, err := aciFile.Seek(0, 0); err != nil {
		return nil, aciFile, nil, fmt.Errorf("error seeking ACI file: %v", err)
	}
	return entity, aciFile, cd, nil
}
示例#3
0
文件: images.go 项目: liugenping/rkt
// fetch opens/downloads and verifies the remote ACI.
// If appName is not "", it will be used to check that the manifest contain the correct appName
// If ascFile is not nil, it will be used as the signature file and ascURL will be ignored.
// If Keystore is nil signature verification will be skipped, regardless of ascFile.
// fetch returns the signer, an *os.File representing the ACI, and an error if any.
// err will be nil if the ACI fetches successfully and the ACI is verified.
func (f *fetcher) fetch(appName string, aciURL, ascURL string, ascFile *os.File, etag string) (*openpgp.Entity, *os.File, *cacheData, error) {
	var (
		entity *openpgp.Entity
		cd     *cacheData
	)

	u, err := url.Parse(aciURL)
	if err != nil {
		return nil, nil, nil, fmt.Errorf("error parsing ACI url: %v", err)
	}
	if u.Scheme == "docker" {
		registryURL := strings.TrimPrefix(aciURL, "docker://")

		storeTmpDir, err := f.s.TmpDir()
		if err != nil {
			return nil, nil, nil, fmt.Errorf("error creating temporary dir for docker to ACI conversion: %v", err)
		}
		tmpDir, err := ioutil.TempDir(storeTmpDir, "docker2aci-")
		if err != nil {
			return nil, nil, nil, err
		}
		defer os.RemoveAll(tmpDir)

		indexName := docker2aci.GetIndexName(registryURL)
		user := ""
		password := ""
		if creds, ok := f.dockerAuth[indexName]; ok {
			user = creds.User
			password = creds.Password
		}
		acis, err := docker2aci.Convert(registryURL, true, tmpDir, tmpDir, user, password)
		if err != nil {
			return nil, nil, nil, fmt.Errorf("error converting docker image to ACI: %v", err)
		}

		aciFile, err := os.Open(acis[0])
		if err != nil {
			return nil, nil, nil, fmt.Errorf("error opening squashed ACI file: %v", err)
		}

		return nil, aciFile, nil, nil
	}

	// attempt to automatically fetch the public key in case it is available on a TLS connection.
	if globalFlags.TrustKeysFromHttps && !globalFlags.InsecureFlags.SkipTlsCheck() && appName != "" && f.ks != nil {
		m := &pubkey.Manager{
			AuthPerHost:        f.headers,
			InsecureAllowHttp:  false,
			TrustKeysFromHttps: true,
			Ks:                 f.ks,
			Debug:              globalFlags.Debug,
		}
		pkls, err := m.GetPubKeyLocations(appName)
		if err != nil {
			stderr("Error determining key location: %v", err)
		} else {
			if err := m.AddKeys(pkls, appName, pubkey.AcceptForce, pubkey.OverrideDeny); err != nil {
				stderr("Error adding keys: %v", err)
			}
		}
	}

	var retrySignature bool
	if f.ks != nil && ascFile == nil {
		u, err := url.Parse(ascURL)
		if err != nil {
			return nil, nil, nil, fmt.Errorf("error parsing ASC url: %v", err)
		}
		if u.Scheme == "file" {
			ascFile, err = os.Open(u.Path)
			if err != nil {
				return nil, nil, nil, fmt.Errorf("error opening signature file: %v", err)
			}
		} else {
			stderr("Downloading signature from %v\n", ascURL)
			ascFile, err = f.s.TmpFile()
			if err != nil {
				return nil, nil, nil, fmt.Errorf("error setting up temporary file: %v", err)
			}
			defer os.Remove(ascFile.Name())

			err = f.downloadSignatureFile(ascURL, ascFile)
			switch err {
			case errStatusAccepted:
				retrySignature = true
				stderr("rkt: server requested deferring the signature download")
			case nil:
				break
			default:
				return nil, nil, nil, fmt.Errorf("error downloading the signature file: %v", err)
			}
		}
		defer ascFile.Close()
	}

	// check if the identity used by the signature is in the store before a
	// possibly expensive download. This is only an optimization and it's
	// ok to skip the test if the signature will be downloaded later.
	if !retrySignature && f.ks != nil && appName != "" {
		if _, err := ascFile.Seek(0, 0); err != nil {
			return nil, nil, nil, fmt.Errorf("error seeking signature file: %v", err)
		}
		if entity, err = f.ks.CheckSignature(appName, bytes.NewReader([]byte{}), ascFile); err != nil {
			if _, ok := err.(pgperrors.SignatureError); !ok {
				return nil, nil, nil, err
			}
		}
	}

	var aciFile *os.File
	if u.Scheme == "file" {
		aciFile, err = os.Open(u.Path)
		if err != nil {
			return nil, nil, nil, fmt.Errorf("error opening ACI file: %v", err)
		}
	} else {
		h := sha512.New()
		h.Write([]byte(aciURL))
		aciURLHash := f.s.HashToKey(h)

		aciFile, err = f.s.TmpNamedFile(aciURLHash)
		if err != nil {
			return nil, aciFile, nil, fmt.Errorf("error setting up temporary file: %v", err)
		}
		defer os.Remove(aciFile.Name())

		if cd, err = f.downloadACI(aciURL, aciFile, etag); err != nil {
			return nil, nil, nil, fmt.Errorf("error downloading ACI: %v", err)
		}
		if cd.useCached {
			return nil, nil, cd, nil
		}
	}

	if retrySignature {
		if err = f.downloadSignatureFile(ascURL, ascFile); err != nil {
			return nil, aciFile, nil, fmt.Errorf("error downloading the signature file: %v", err)
		}
	}

	manifest, err := aci.ManifestFromImage(aciFile)
	if err != nil {
		return nil, aciFile, nil, fmt.Errorf("invalid image manifest: %v", err)
	}
	// Check if the downloaded ACI has the correct app name.
	// The check is only performed when the aci is downloaded through the
	// discovery protocol, but not with local files or full URL.
	if appName != "" && manifest.Name.String() != appName {
		return nil, aciFile, nil,
			fmt.Errorf("error when reading the app name: %q expected but %q found",
				appName, manifest.Name.String())
	}

	if f.ks != nil {
		if _, err := aciFile.Seek(0, 0); err != nil {
			return nil, aciFile, nil, fmt.Errorf("error seeking ACI file: %v", err)
		}
		if _, err := ascFile.Seek(0, 0); err != nil {
			return nil, aciFile, nil, fmt.Errorf("error seeking signature file: %v", err)
		}
		if entity, err = f.ks.CheckSignature(manifest.Name.String(), aciFile, ascFile); err != nil {
			return nil, aciFile, nil, err
		}
	}

	if _, err := aciFile.Seek(0, 0); err != nil {
		return nil, aciFile, nil, fmt.Errorf("error seeking ACI file: %v", err)
	}
	return entity, aciFile, cd, nil
}
示例#4
0
// fetch opens/downloads and verifies the remote ACI.
// If ascFile is not nil, it will be used as the signature file and ascURL will be ignored.
// If Keystore is nil signature verification will be skipped, regardless of ascFile.
// fetch returns the signer, an *os.File representing the ACI, and an error if any.
// err will be nil if the ACI fetches successfully and the ACI is verified.
func (f *fetcher) fetch(aciURL, ascURL string, ascFile *os.File) (*openpgp.Entity, *os.File, error) {
	var entity *openpgp.Entity
	u, err := url.Parse(aciURL)
	if err != nil {
		return nil, nil, fmt.Errorf("error parsing ACI url: %v", err)
	}
	if u.Scheme == "docker" {
		registryURL := strings.TrimPrefix(aciURL, "docker://")

		tmpDir, err := f.s.TmpDir()
		if err != nil {
			return nil, nil, fmt.Errorf("error creating temporary dir for docker to ACI conversion: %v", err)
		}

		indexName := docker2aci.GetIndexName(registryURL)
		user := ""
		password := ""
		if creds, ok := f.dockerAuth[indexName]; ok {
			user = creds.User
			password = creds.Password
		}
		acis, err := docker2aci.Convert(registryURL, true, tmpDir, tmpDir, user, password)
		if err != nil {
			return nil, nil, fmt.Errorf("error converting docker image to ACI: %v", err)
		}

		aciFile, err := os.Open(acis[0])
		if err != nil {
			return nil, nil, fmt.Errorf("error opening squashed ACI file: %v", err)
		}

		return nil, aciFile, nil
	}

	var retrySignature bool
	if f.ks != nil && ascFile == nil {
		u, err := url.Parse(ascURL)
		if err != nil {
			return nil, nil, fmt.Errorf("error parsing ASC url: %v", err)
		}
		if u.Scheme == "file" {
			ascFile, err = os.Open(u.Path)
			if err != nil {
				return nil, nil, fmt.Errorf("error opening signature file: %v", err)
			}
		} else {
			stderr("Downloading signature from %v\n", ascURL)
			ascFile, err = f.s.TmpFile()
			if err != nil {
				return nil, nil, fmt.Errorf("error setting up temporary file: %v", err)
			}
			defer os.Remove(ascFile.Name())

			err = f.downloadSignatureFile(ascURL, ascFile)
			switch err {
			case errStatusAccepted:
				retrySignature = true
				stderr("rkt: server requested deferring the signature download")
			case nil:
				break
			default:
				return nil, nil, fmt.Errorf("error downloading the signature file: %v", err)
			}
		}
		defer ascFile.Close()
	}

	var aciFile *os.File
	if u.Scheme == "file" {
		aciFile, err = os.Open(u.Path)
		if err != nil {
			return nil, nil, fmt.Errorf("error opening ACI file: %v", err)
		}
	} else {
		aciFile, err = f.s.TmpFile()
		if err != nil {
			return nil, aciFile, fmt.Errorf("error setting up temporary file: %v", err)
		}
		defer os.Remove(aciFile.Name())

		if err = f.downloadACI(aciURL, aciFile); err != nil {
			return nil, nil, fmt.Errorf("error downloading ACI: %v", err)
		}
	}

	if retrySignature {
		if err = f.downloadSignatureFile(ascURL, ascFile); err != nil {
			return nil, aciFile, fmt.Errorf("error downloading the signature file: %v", err)
		}
	}

	if f.ks != nil {
		manifest, err := aci.ManifestFromImage(aciFile)
		if err != nil {
			return nil, aciFile, err
		}

		if _, err := aciFile.Seek(0, 0); err != nil {
			return nil, aciFile, fmt.Errorf("error seeking ACI file: %v", err)
		}
		if _, err := ascFile.Seek(0, 0); err != nil {
			return nil, aciFile, fmt.Errorf("error seeking signature file: %v", err)
		}
		if entity, err = f.ks.CheckSignature(manifest.Name.String(), aciFile, ascFile); err != nil {
			return nil, aciFile, err
		}
	}

	if _, err := aciFile.Seek(0, 0); err != nil {
		return nil, aciFile, fmt.Errorf("error seeking ACI file: %v", err)
	}
	return entity, aciFile, nil
}