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sftpd: explicitly configure supported SFTP extensions

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update pkg/sftp to a git revision that includes the needed patch

https://github.com/pkg/sftp/pull/315
This commit is contained in:
Nicola Murino 2019-11-12 07:37:47 +01:00
parent 74367a65cc
commit 363b9ccc7f
4 changed files with 30 additions and 3 deletions
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2
go.mod
View file

@ -14,7 +14,7 @@ require (
github.com/miekg/dns v1.1.22 // indirect
github.com/nathanaelle/password v1.0.0
github.com/pelletier/go-toml v1.6.0 // indirect
github.com/pkg/sftp v1.10.2-0.20191102210727-6d50bf4a2122
github.com/pkg/sftp v1.10.2-0.20191111234405-8488d36edee7
github.com/prometheus/client_golang v1.2.1
github.com/rs/xid v1.2.1
github.com/rs/zerolog v1.16.0

4
go.sum
View file

@ -113,8 +113,8 @@ github.com/pelletier/go-toml v1.6.0/go.mod h1:5N711Q9dKgbdkxHL+MEfF31hpT7l0S0s/t
github.com/pkg/errors v0.8.0/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I=
github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
github.com/pkg/sftp v1.10.2-0.20191102210727-6d50bf4a2122 h1:sb1Pv18vtpHTpRq4zlPIaiBw815nIkFIrARKIRSVBjM=
github.com/pkg/sftp v1.10.2-0.20191102210727-6d50bf4a2122/go.mod h1:lYOWFsE0bwd1+KfKJaKeuokY15vzFx25BLbzYYoAxZI=
github.com/pkg/sftp v1.10.2-0.20191111234405-8488d36edee7 h1:0aliGCO3gzhJZYrCyPwl/H631u53ol99CoxH1Xx3ROk=
github.com/pkg/sftp v1.10.2-0.20191111234405-8488d36edee7/go.mod h1:lYOWFsE0bwd1+KfKJaKeuokY15vzFx25BLbzYYoAxZI=
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/prometheus/client_golang v0.9.1/go.mod h1:7SWBe2y4D6OKWSNQJUaRYU/AaXPKyh/dDVn+NZz0KFw=

15
sftpd/internal_test.go
View file

@ -802,3 +802,18 @@ func TestConnectionStatusStruct(t *testing.T) {
t.Errorf("error getting connection info")
}
}
func TestSFTPExtensions(t *testing.T) {
initialSFTPExtensions := sftpExtensions
c := Configuration{}
err := c.configureSFTPExtensions()
if err != nil {
t.Errorf("error configuring SFTP extensions")
}
sftpExtensions = append(sftpExtensions, "invalid@example.com")
err = c.configureSFTPExtensions()
if err == nil {
t.Errorf("configuring invalid SFTP extensions must fail")
}
sftpExtensions = initialSFTPExtensions
}

12
sftpd/server.go
View file

@ -28,6 +28,8 @@ import (
const defaultPrivateKeyName = "id_rsa"
var sftpExtensions = []string{"posix-rename@openssh.com"}
// Configuration for the SFTP server
type Configuration struct {
// Identification string used by the server
@ -153,6 +155,7 @@ func (c Configuration) Initialize(configDir string) error {
c.configureSecurityOptions(serverConfig)
c.configureLoginBanner(serverConfig, configDir)
c.configureSFTPExtensions()
listener, err := net.Listen("tcp", fmt.Sprintf("%s:%d", c.BindAddress, c.BindPort))
if err != nil {
@ -208,6 +211,15 @@ func (c Configuration) configureLoginBanner(serverConfig *ssh.ServerConfig, conf
return err
}
func (c Configuration) configureSFTPExtensions() error {
err := sftp.SetSFTPExtensions(sftpExtensions...)
if err != nil {
logger.WarnToConsole("unable to configure SFTP extensions: %v", err)
logger.Warn(logSender, "", "unable to configure SFTP extensions: %v", err)
}
return err
}
// AcceptInboundConnection handles an inbound connection to the server instance and determines if the request should be served or not.
func (c Configuration) AcceptInboundConnection(conn net.Conn, config *ssh.ServerConfig) {