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allow native and ssh-keygen public key check

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This commit adds the possibibility to use either the native golang
libraries or ssh-keygen to check public keys. The check is adjusted
depending on the settings, so that only supported keys are let through.

This commit also brings back the blacklist feature, which was removed in
7ef9a05588. This allows to blacklist
algorythms or keys based on the key length. This works with the native
and the ssh-keygen way.

Because of #2179 it also includes a way to adjust the path to
ssh-keygen and the working directory for ssh-keygen. With this,
sysadmins should be able to adjust the settings in a way, that SELinux
is okay with it. In the worst case, they can switch to the native
implementation and only loose support for ed25519 keys at the moment.
There are some other places which need adjustment to utilize the
parameters and the native implementation, but this sets the ground work.
This commit is contained in:
Gibheer 2016-02-16 23:01:56 +01:00
parent 3af1d3c581
commit 12403bdfb0
4 changed files with 227 additions and 15 deletions
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45
modules/setting/setting.go
View file

@ -30,9 +30,11 @@ import (
type Scheme string
const (
HTTP Scheme = "http"
HTTPS Scheme = "https"
FCGI Scheme = "fcgi"
HTTP Scheme = "http"
HTTPS Scheme = "https"
FCGI Scheme = "fcgi"
SSH_PUBLICKEY_CHECK_NATIVE = "native"
SSH_PUBLICKEY_CHECK_KEYGEN = "ssh-keygen"
)
type LandingPage string
@ -66,6 +68,9 @@ var (
SSHDomain string
SSHPort int
SSHRootPath string
SSHPublicKeyCheck string
SSHWorkPath string
SSHKeyGenPath string
OfflineMode bool
DisableRouterLog bool
CertFile, KeyFile string
@ -328,6 +333,29 @@ func NewContext() {
if err := os.MkdirAll(SSHRootPath, 0700); err != nil {
log.Fatal(4, "Fail to create '%s': %v", SSHRootPath, err)
}
checkDefault := SSH_PUBLICKEY_CHECK_KEYGEN
if DisableSSH {
checkDefault = SSH_PUBLICKEY_CHECK_NATIVE
}
SSHPublicKeyCheck = sec.Key("SSH_PUBLICKEY_CHECK").MustString(checkDefault)
if SSHPublicKeyCheck != SSH_PUBLICKEY_CHECK_NATIVE &&
SSHPublicKeyCheck != SSH_PUBLICKEY_CHECK_KEYGEN {
log.Fatal(4, "SSH_PUBLICKEY_CHECK must be ssh-keygen or native")
}
SSHWorkPath = sec.Key("SSH_WORK_PATH").MustString(os.TempDir())
if !DisableSSH && (!StartSSHServer || SSHPublicKeyCheck == SSH_PUBLICKEY_CHECK_KEYGEN) {
if tmpDirStat, err := os.Stat(SSHWorkPath); err != nil || !tmpDirStat.IsDir() {
log.Fatal(4, "directory '%s' set in SSHWorkPath is not a directory: %s", SSHWorkPath, err)
}
}
SSHKeyGenPath = sec.Key("SSH_KEYGEN_PATH").MustString("")
if !DisableSSH && !StartSSHServer &&
SSHKeyGenPath == "" && SSHPublicKeyCheck == SSH_PUBLICKEY_CHECK_KEYGEN {
SSHKeyGenPath, err = exec.LookPath("ssh-keygen")
if err != nil {
log.Fatal(4, "could not find ssh-keygen, maybe set DISABLE_SSH to use the internal ssh server")
}
}
OfflineMode = sec.Key("OFFLINE_MODE").MustBool()
DisableRouterLog = sec.Key("DISABLE_ROUTER_LOG").MustBool()
StaticRootPath = sec.Key("STATIC_ROOT_PATH").MustString(workDir)
@ -459,6 +487,8 @@ var Service struct {
EnableReverseProxyAuth bool
EnableReverseProxyAutoRegister bool
EnableCaptcha bool
EnableMinimumKeySizeCheck bool
MinimumKeySizes map[string]int
}
func newService() {
@ -471,6 +501,15 @@ func newService() {
Service.EnableReverseProxyAuth = sec.Key("ENABLE_REVERSE_PROXY_AUTHENTICATION").MustBool()
Service.EnableReverseProxyAutoRegister = sec.Key("ENABLE_REVERSE_PROXY_AUTO_REGISTRATION").MustBool()
Service.EnableCaptcha = sec.Key("ENABLE_CAPTCHA").MustBool()
Service.EnableMinimumKeySizeCheck = sec.Key("ENABLE_MINIMUM_KEY_SIZE_CHECK").MustBool()
Service.MinimumKeySizes = map[string]int{}
minimumKeySizes := Cfg.Section("service.minimum_key_sizes").Keys()
for _, key := range minimumKeySizes {
if key.MustInt() != -1 {
Service.MinimumKeySizes[strings.ToLower(key.Name())] = key.MustInt()
}
}
}
var logLevels = map[string]string{