gitea/modules/ssh/ssh.go

423 lines
12 KiB
Go
Raw Normal View History

// Copyright 2017 The Gitea Authors. All rights reserved.
2014-07-26 06:24:27 +02:00
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package ssh
import (
Add ssh certificate support (#12281) * Add ssh certificate support * Add ssh certificate support to builtin ssh * Write trusted-user-ca-keys.pem based on configuration * Update app.example.ini * Update templates/user/settings/keys_principal.tmpl Co-authored-by: silverwind <me@silverwind.io> * Remove unused locale string * Update options/locale/locale_en-US.ini Co-authored-by: silverwind <me@silverwind.io> * Update options/locale/locale_en-US.ini Co-authored-by: silverwind <me@silverwind.io> * Update models/ssh_key.go Co-authored-by: silverwind <me@silverwind.io> * Add missing creation of SSH.Rootpath * Update cheatsheet, example and locale strings * Update models/ssh_key.go Co-authored-by: zeripath <art27@cantab.net> * Update models/ssh_key.go Co-authored-by: zeripath <art27@cantab.net> * Update models/ssh_key.go Co-authored-by: zeripath <art27@cantab.net> * Update models/ssh_key.go Co-authored-by: zeripath <art27@cantab.net> * Update models/ssh_key.go * Optimizations based on feedback * Validate CA keys for external sshd * Add filename option and change default filename Add a SSH_TRUSTED_USER_CA_KEYS_FILENAME option which default is RUN_USER/.ssh/gitea-trusted-user-ca-keys.pem Do not write a file when SSH_TRUSTED_USER_CA_KEYS is empty. Add some more documentation. * Remove unneeded principalkey functions * Add blank line * Apply suggestions from code review Co-authored-by: zeripath <art27@cantab.net> * Add SSH_AUTHORIZED_PRINCIPALS_ALLOW option This adds a SSH_AUTHORIZED_PRINCIPALS_ALLOW which is default email,username this means that users only can add the principals that match their email or username. To allow anything the admin need to set the option anything. This allows for a safe default in gitea which protects against malicious users using other user's prinicipals. (before that user could set it). This commit also has some small other fixes from the last code review. * Rewrite principal keys file on user deletion * Use correct rewrite method * Set correct AuthorizedPrincipalsBackup default setting * Rewrite principalsfile when adding principals * Add update authorized_principals option to admin dashboard * Handle non-primary emails Signed-off-by: Andrew Thornton <art27@cantab.net> * Add the command actually to the dashboard template * Update models/ssh_key.go Co-authored-by: silverwind <me@silverwind.io> * By default do not show principal options unless there are CA keys set or they are explicitly set Signed-off-by: Andrew Thornton <art27@cantab.net> * allow settings when enabled * Fix typos in TrustedUserCAKeys path * Allow every CASignatureAlgorithms algorithm As this depends on the content of TrustedUserCAKeys we should allow all signature algorithms as admins can choose the specific algorithm on their signing CA * Update models/ssh_key.go Co-authored-by: Lauris BH <lauris@nix.lv> * Fix linting issue Co-authored-by: silverwind <me@silverwind.io> Co-authored-by: zeripath <art27@cantab.net> Co-authored-by: Lauris BH <lauris@nix.lv> Co-authored-by: techknowlogick <matti@mdranta.net> Co-authored-by: techknowlogick <techknowlogick@gitea.io>
2020-10-11 02:38:09 +02:00
"bytes"
"context"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"encoding/pem"
"fmt"
"io"
"net"
2014-07-26 06:24:27 +02:00
"os"
"os/exec"
"path/filepath"
"strconv"
2014-07-26 06:24:27 +02:00
"strings"
"sync"
"syscall"
2014-07-26 06:24:27 +02:00
asymkey_model "code.gitea.io/gitea/models/asymkey"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/util"
"github.com/gliderlabs/ssh"
gossh "golang.org/x/crypto/ssh"
2014-07-26 06:24:27 +02:00
)
type contextKey string
const giteaKeyID = contextKey("gitea-key-id")
func getExitStatusFromError(err error) int {
if err == nil {
return 0
}
exitErr, ok := err.(*exec.ExitError)
if !ok {
return 1
}
waitStatus, ok := exitErr.Sys().(syscall.WaitStatus)
if !ok {
// This is a fallback and should at least let us return something useful
// when running on Windows, even if it isn't completely accurate.
if exitErr.Success() {
return 0
2014-07-26 06:24:27 +02:00
}
return 1
2014-07-26 06:24:27 +02:00
}
return waitStatus.ExitStatus()
2014-07-26 06:24:27 +02:00
}
func sessionHandler(session ssh.Session) {
keyID := fmt.Sprintf("%d", session.Context().Value(giteaKeyID).(int64))
command := session.RawCommand()
log.Trace("SSH: Payload: %v", command)
args := []string{"serv", "key-" + keyID, "--config=" + setting.CustomConf}
log.Trace("SSH: Arguments: %v", args)
ctx, cancel := context.WithCancel(session.Context())
defer cancel()
cmd := exec.CommandContext(ctx, setting.AppPath, args...)
cmd.Env = append(
os.Environ(),
"SSH_ORIGINAL_COMMAND="+command,
"SKIP_MINWINSVC=1",
)
stdout, err := cmd.StdoutPipe()
2014-07-26 06:24:27 +02:00
if err != nil {
log.Error("SSH: StdoutPipe: %v", err)
return
2014-07-26 06:24:27 +02:00
}
defer stdout.Close()
stderr, err := cmd.StderrPipe()
if err != nil {
log.Error("SSH: StderrPipe: %v", err)
return
}
defer stderr.Close()
stdin, err := cmd.StdinPipe()
if err != nil {
log.Error("SSH: StdinPipe: %v", err)
return
}
defer stdin.Close()
wg := &sync.WaitGroup{}
wg.Add(2)
if err = cmd.Start(); err != nil {
log.Error("SSH: Start: %v", err)
return
}
go func() {
defer stdin.Close()
if _, err := io.Copy(stdin, session); err != nil {
log.Error("Failed to write session to stdin. %s", err)
}
}()
go func() {
defer wg.Done()
defer stdout.Close()
if _, err := io.Copy(session, stdout); err != nil {
log.Error("Failed to write stdout to session. %s", err)
}
}()
go func() {
defer wg.Done()
defer stderr.Close()
if _, err := io.Copy(session.Stderr(), stderr); err != nil {
log.Error("Failed to write stderr to session. %s", err)
2014-07-26 06:24:27 +02:00
}
}()
// Ensure all the output has been written before we wait on the command
// to exit.
wg.Wait()
// Wait for the command to exit and log any errors we get
err = cmd.Wait()
if err != nil {
log.Error("SSH: Wait: %v", err)
}
if err := session.Exit(getExitStatusFromError(err)); err != nil {
log.Error("Session failed to exit. %s", err)
}
}
func publicKeyHandler(ctx ssh.Context, key ssh.PublicKey) bool {
if log.IsDebug() { // <- FingerprintSHA256 is kinda expensive so only calculate it if necessary
log.Debug("Handle Public Key: Fingerprint: %s from %s", gossh.FingerprintSHA256(key), ctx.RemoteAddr())
}
if ctx.User() != setting.SSH.BuiltinServerUser {
log.Warn("Invalid SSH username %s - must use %s for all git operations via ssh", ctx.User(), setting.SSH.BuiltinServerUser)
log.Warn("Failed authentication attempt from %s", ctx.RemoteAddr())
return false
}
Add ssh certificate support (#12281) * Add ssh certificate support * Add ssh certificate support to builtin ssh * Write trusted-user-ca-keys.pem based on configuration * Update app.example.ini * Update templates/user/settings/keys_principal.tmpl Co-authored-by: silverwind <me@silverwind.io> * Remove unused locale string * Update options/locale/locale_en-US.ini Co-authored-by: silverwind <me@silverwind.io> * Update options/locale/locale_en-US.ini Co-authored-by: silverwind <me@silverwind.io> * Update models/ssh_key.go Co-authored-by: silverwind <me@silverwind.io> * Add missing creation of SSH.Rootpath * Update cheatsheet, example and locale strings * Update models/ssh_key.go Co-authored-by: zeripath <art27@cantab.net> * Update models/ssh_key.go Co-authored-by: zeripath <art27@cantab.net> * Update models/ssh_key.go Co-authored-by: zeripath <art27@cantab.net> * Update models/ssh_key.go Co-authored-by: zeripath <art27@cantab.net> * Update models/ssh_key.go * Optimizations based on feedback * Validate CA keys for external sshd * Add filename option and change default filename Add a SSH_TRUSTED_USER_CA_KEYS_FILENAME option which default is RUN_USER/.ssh/gitea-trusted-user-ca-keys.pem Do not write a file when SSH_TRUSTED_USER_CA_KEYS is empty. Add some more documentation. * Remove unneeded principalkey functions * Add blank line * Apply suggestions from code review Co-authored-by: zeripath <art27@cantab.net> * Add SSH_AUTHORIZED_PRINCIPALS_ALLOW option This adds a SSH_AUTHORIZED_PRINCIPALS_ALLOW which is default email,username this means that users only can add the principals that match their email or username. To allow anything the admin need to set the option anything. This allows for a safe default in gitea which protects against malicious users using other user's prinicipals. (before that user could set it). This commit also has some small other fixes from the last code review. * Rewrite principal keys file on user deletion * Use correct rewrite method * Set correct AuthorizedPrincipalsBackup default setting * Rewrite principalsfile when adding principals * Add update authorized_principals option to admin dashboard * Handle non-primary emails Signed-off-by: Andrew Thornton <art27@cantab.net> * Add the command actually to the dashboard template * Update models/ssh_key.go Co-authored-by: silverwind <me@silverwind.io> * By default do not show principal options unless there are CA keys set or they are explicitly set Signed-off-by: Andrew Thornton <art27@cantab.net> * allow settings when enabled * Fix typos in TrustedUserCAKeys path * Allow every CASignatureAlgorithms algorithm As this depends on the content of TrustedUserCAKeys we should allow all signature algorithms as admins can choose the specific algorithm on their signing CA * Update models/ssh_key.go Co-authored-by: Lauris BH <lauris@nix.lv> * Fix linting issue Co-authored-by: silverwind <me@silverwind.io> Co-authored-by: zeripath <art27@cantab.net> Co-authored-by: Lauris BH <lauris@nix.lv> Co-authored-by: techknowlogick <matti@mdranta.net> Co-authored-by: techknowlogick <techknowlogick@gitea.io>
2020-10-11 02:38:09 +02:00
// check if we have a certificate
if cert, ok := key.(*gossh.Certificate); ok {
if log.IsDebug() { // <- FingerprintSHA256 is kinda expensive so only calculate it if necessary
log.Debug("Handle Certificate: %s Fingerprint: %s is a certificate", ctx.RemoteAddr(), gossh.FingerprintSHA256(key))
}
Add ssh certificate support (#12281) * Add ssh certificate support * Add ssh certificate support to builtin ssh * Write trusted-user-ca-keys.pem based on configuration * Update app.example.ini * Update templates/user/settings/keys_principal.tmpl Co-authored-by: silverwind <me@silverwind.io> * Remove unused locale string * Update options/locale/locale_en-US.ini Co-authored-by: silverwind <me@silverwind.io> * Update options/locale/locale_en-US.ini Co-authored-by: silverwind <me@silverwind.io> * Update models/ssh_key.go Co-authored-by: silverwind <me@silverwind.io> * Add missing creation of SSH.Rootpath * Update cheatsheet, example and locale strings * Update models/ssh_key.go Co-authored-by: zeripath <art27@cantab.net> * Update models/ssh_key.go Co-authored-by: zeripath <art27@cantab.net> * Update models/ssh_key.go Co-authored-by: zeripath <art27@cantab.net> * Update models/ssh_key.go Co-authored-by: zeripath <art27@cantab.net> * Update models/ssh_key.go * Optimizations based on feedback * Validate CA keys for external sshd * Add filename option and change default filename Add a SSH_TRUSTED_USER_CA_KEYS_FILENAME option which default is RUN_USER/.ssh/gitea-trusted-user-ca-keys.pem Do not write a file when SSH_TRUSTED_USER_CA_KEYS is empty. Add some more documentation. * Remove unneeded principalkey functions * Add blank line * Apply suggestions from code review Co-authored-by: zeripath <art27@cantab.net> * Add SSH_AUTHORIZED_PRINCIPALS_ALLOW option This adds a SSH_AUTHORIZED_PRINCIPALS_ALLOW which is default email,username this means that users only can add the principals that match their email or username. To allow anything the admin need to set the option anything. This allows for a safe default in gitea which protects against malicious users using other user's prinicipals. (before that user could set it). This commit also has some small other fixes from the last code review. * Rewrite principal keys file on user deletion * Use correct rewrite method * Set correct AuthorizedPrincipalsBackup default setting * Rewrite principalsfile when adding principals * Add update authorized_principals option to admin dashboard * Handle non-primary emails Signed-off-by: Andrew Thornton <art27@cantab.net> * Add the command actually to the dashboard template * Update models/ssh_key.go Co-authored-by: silverwind <me@silverwind.io> * By default do not show principal options unless there are CA keys set or they are explicitly set Signed-off-by: Andrew Thornton <art27@cantab.net> * allow settings when enabled * Fix typos in TrustedUserCAKeys path * Allow every CASignatureAlgorithms algorithm As this depends on the content of TrustedUserCAKeys we should allow all signature algorithms as admins can choose the specific algorithm on their signing CA * Update models/ssh_key.go Co-authored-by: Lauris BH <lauris@nix.lv> * Fix linting issue Co-authored-by: silverwind <me@silverwind.io> Co-authored-by: zeripath <art27@cantab.net> Co-authored-by: Lauris BH <lauris@nix.lv> Co-authored-by: techknowlogick <matti@mdranta.net> Co-authored-by: techknowlogick <techknowlogick@gitea.io>
2020-10-11 02:38:09 +02:00
if len(setting.SSH.TrustedUserCAKeys) == 0 {
log.Warn("Certificate Rejected: No trusted certificate authorities for this server")
log.Warn("Failed authentication attempt from %s", ctx.RemoteAddr())
Add ssh certificate support (#12281) * Add ssh certificate support * Add ssh certificate support to builtin ssh * Write trusted-user-ca-keys.pem based on configuration * Update app.example.ini * Update templates/user/settings/keys_principal.tmpl Co-authored-by: silverwind <me@silverwind.io> * Remove unused locale string * Update options/locale/locale_en-US.ini Co-authored-by: silverwind <me@silverwind.io> * Update options/locale/locale_en-US.ini Co-authored-by: silverwind <me@silverwind.io> * Update models/ssh_key.go Co-authored-by: silverwind <me@silverwind.io> * Add missing creation of SSH.Rootpath * Update cheatsheet, example and locale strings * Update models/ssh_key.go Co-authored-by: zeripath <art27@cantab.net> * Update models/ssh_key.go Co-authored-by: zeripath <art27@cantab.net> * Update models/ssh_key.go Co-authored-by: zeripath <art27@cantab.net> * Update models/ssh_key.go Co-authored-by: zeripath <art27@cantab.net> * Update models/ssh_key.go * Optimizations based on feedback * Validate CA keys for external sshd * Add filename option and change default filename Add a SSH_TRUSTED_USER_CA_KEYS_FILENAME option which default is RUN_USER/.ssh/gitea-trusted-user-ca-keys.pem Do not write a file when SSH_TRUSTED_USER_CA_KEYS is empty. Add some more documentation. * Remove unneeded principalkey functions * Add blank line * Apply suggestions from code review Co-authored-by: zeripath <art27@cantab.net> * Add SSH_AUTHORIZED_PRINCIPALS_ALLOW option This adds a SSH_AUTHORIZED_PRINCIPALS_ALLOW which is default email,username this means that users only can add the principals that match their email or username. To allow anything the admin need to set the option anything. This allows for a safe default in gitea which protects against malicious users using other user's prinicipals. (before that user could set it). This commit also has some small other fixes from the last code review. * Rewrite principal keys file on user deletion * Use correct rewrite method * Set correct AuthorizedPrincipalsBackup default setting * Rewrite principalsfile when adding principals * Add update authorized_principals option to admin dashboard * Handle non-primary emails Signed-off-by: Andrew Thornton <art27@cantab.net> * Add the command actually to the dashboard template * Update models/ssh_key.go Co-authored-by: silverwind <me@silverwind.io> * By default do not show principal options unless there are CA keys set or they are explicitly set Signed-off-by: Andrew Thornton <art27@cantab.net> * allow settings when enabled * Fix typos in TrustedUserCAKeys path * Allow every CASignatureAlgorithms algorithm As this depends on the content of TrustedUserCAKeys we should allow all signature algorithms as admins can choose the specific algorithm on their signing CA * Update models/ssh_key.go Co-authored-by: Lauris BH <lauris@nix.lv> * Fix linting issue Co-authored-by: silverwind <me@silverwind.io> Co-authored-by: zeripath <art27@cantab.net> Co-authored-by: Lauris BH <lauris@nix.lv> Co-authored-by: techknowlogick <matti@mdranta.net> Co-authored-by: techknowlogick <techknowlogick@gitea.io>
2020-10-11 02:38:09 +02:00
return false
}
// look for the exact principal
principalLoop:
Add ssh certificate support (#12281) * Add ssh certificate support * Add ssh certificate support to builtin ssh * Write trusted-user-ca-keys.pem based on configuration * Update app.example.ini * Update templates/user/settings/keys_principal.tmpl Co-authored-by: silverwind <me@silverwind.io> * Remove unused locale string * Update options/locale/locale_en-US.ini Co-authored-by: silverwind <me@silverwind.io> * Update options/locale/locale_en-US.ini Co-authored-by: silverwind <me@silverwind.io> * Update models/ssh_key.go Co-authored-by: silverwind <me@silverwind.io> * Add missing creation of SSH.Rootpath * Update cheatsheet, example and locale strings * Update models/ssh_key.go Co-authored-by: zeripath <art27@cantab.net> * Update models/ssh_key.go Co-authored-by: zeripath <art27@cantab.net> * Update models/ssh_key.go Co-authored-by: zeripath <art27@cantab.net> * Update models/ssh_key.go Co-authored-by: zeripath <art27@cantab.net> * Update models/ssh_key.go * Optimizations based on feedback * Validate CA keys for external sshd * Add filename option and change default filename Add a SSH_TRUSTED_USER_CA_KEYS_FILENAME option which default is RUN_USER/.ssh/gitea-trusted-user-ca-keys.pem Do not write a file when SSH_TRUSTED_USER_CA_KEYS is empty. Add some more documentation. * Remove unneeded principalkey functions * Add blank line * Apply suggestions from code review Co-authored-by: zeripath <art27@cantab.net> * Add SSH_AUTHORIZED_PRINCIPALS_ALLOW option This adds a SSH_AUTHORIZED_PRINCIPALS_ALLOW which is default email,username this means that users only can add the principals that match their email or username. To allow anything the admin need to set the option anything. This allows for a safe default in gitea which protects against malicious users using other user's prinicipals. (before that user could set it). This commit also has some small other fixes from the last code review. * Rewrite principal keys file on user deletion * Use correct rewrite method * Set correct AuthorizedPrincipalsBackup default setting * Rewrite principalsfile when adding principals * Add update authorized_principals option to admin dashboard * Handle non-primary emails Signed-off-by: Andrew Thornton <art27@cantab.net> * Add the command actually to the dashboard template * Update models/ssh_key.go Co-authored-by: silverwind <me@silverwind.io> * By default do not show principal options unless there are CA keys set or they are explicitly set Signed-off-by: Andrew Thornton <art27@cantab.net> * allow settings when enabled * Fix typos in TrustedUserCAKeys path * Allow every CASignatureAlgorithms algorithm As this depends on the content of TrustedUserCAKeys we should allow all signature algorithms as admins can choose the specific algorithm on their signing CA * Update models/ssh_key.go Co-authored-by: Lauris BH <lauris@nix.lv> * Fix linting issue Co-authored-by: silverwind <me@silverwind.io> Co-authored-by: zeripath <art27@cantab.net> Co-authored-by: Lauris BH <lauris@nix.lv> Co-authored-by: techknowlogick <matti@mdranta.net> Co-authored-by: techknowlogick <techknowlogick@gitea.io>
2020-10-11 02:38:09 +02:00
for _, principal := range cert.ValidPrincipals {
pkey, err := asymkey_model.SearchPublicKeyByContentExact(principal)
Add ssh certificate support (#12281) * Add ssh certificate support * Add ssh certificate support to builtin ssh * Write trusted-user-ca-keys.pem based on configuration * Update app.example.ini * Update templates/user/settings/keys_principal.tmpl Co-authored-by: silverwind <me@silverwind.io> * Remove unused locale string * Update options/locale/locale_en-US.ini Co-authored-by: silverwind <me@silverwind.io> * Update options/locale/locale_en-US.ini Co-authored-by: silverwind <me@silverwind.io> * Update models/ssh_key.go Co-authored-by: silverwind <me@silverwind.io> * Add missing creation of SSH.Rootpath * Update cheatsheet, example and locale strings * Update models/ssh_key.go Co-authored-by: zeripath <art27@cantab.net> * Update models/ssh_key.go Co-authored-by: zeripath <art27@cantab.net> * Update models/ssh_key.go Co-authored-by: zeripath <art27@cantab.net> * Update models/ssh_key.go Co-authored-by: zeripath <art27@cantab.net> * Update models/ssh_key.go * Optimizations based on feedback * Validate CA keys for external sshd * Add filename option and change default filename Add a SSH_TRUSTED_USER_CA_KEYS_FILENAME option which default is RUN_USER/.ssh/gitea-trusted-user-ca-keys.pem Do not write a file when SSH_TRUSTED_USER_CA_KEYS is empty. Add some more documentation. * Remove unneeded principalkey functions * Add blank line * Apply suggestions from code review Co-authored-by: zeripath <art27@cantab.net> * Add SSH_AUTHORIZED_PRINCIPALS_ALLOW option This adds a SSH_AUTHORIZED_PRINCIPALS_ALLOW which is default email,username this means that users only can add the principals that match their email or username. To allow anything the admin need to set the option anything. This allows for a safe default in gitea which protects against malicious users using other user's prinicipals. (before that user could set it). This commit also has some small other fixes from the last code review. * Rewrite principal keys file on user deletion * Use correct rewrite method * Set correct AuthorizedPrincipalsBackup default setting * Rewrite principalsfile when adding principals * Add update authorized_principals option to admin dashboard * Handle non-primary emails Signed-off-by: Andrew Thornton <art27@cantab.net> * Add the command actually to the dashboard template * Update models/ssh_key.go Co-authored-by: silverwind <me@silverwind.io> * By default do not show principal options unless there are CA keys set or they are explicitly set Signed-off-by: Andrew Thornton <art27@cantab.net> * allow settings when enabled * Fix typos in TrustedUserCAKeys path * Allow every CASignatureAlgorithms algorithm As this depends on the content of TrustedUserCAKeys we should allow all signature algorithms as admins can choose the specific algorithm on their signing CA * Update models/ssh_key.go Co-authored-by: Lauris BH <lauris@nix.lv> * Fix linting issue Co-authored-by: silverwind <me@silverwind.io> Co-authored-by: zeripath <art27@cantab.net> Co-authored-by: Lauris BH <lauris@nix.lv> Co-authored-by: techknowlogick <matti@mdranta.net> Co-authored-by: techknowlogick <techknowlogick@gitea.io>
2020-10-11 02:38:09 +02:00
if err != nil {
if asymkey_model.IsErrKeyNotExist(err) {
log.Debug("Principal Rejected: %s Unknown Principal: %s", ctx.RemoteAddr(), principal)
continue principalLoop
}
Add ssh certificate support (#12281) * Add ssh certificate support * Add ssh certificate support to builtin ssh * Write trusted-user-ca-keys.pem based on configuration * Update app.example.ini * Update templates/user/settings/keys_principal.tmpl Co-authored-by: silverwind <me@silverwind.io> * Remove unused locale string * Update options/locale/locale_en-US.ini Co-authored-by: silverwind <me@silverwind.io> * Update options/locale/locale_en-US.ini Co-authored-by: silverwind <me@silverwind.io> * Update models/ssh_key.go Co-authored-by: silverwind <me@silverwind.io> * Add missing creation of SSH.Rootpath * Update cheatsheet, example and locale strings * Update models/ssh_key.go Co-authored-by: zeripath <art27@cantab.net> * Update models/ssh_key.go Co-authored-by: zeripath <art27@cantab.net> * Update models/ssh_key.go Co-authored-by: zeripath <art27@cantab.net> * Update models/ssh_key.go Co-authored-by: zeripath <art27@cantab.net> * Update models/ssh_key.go * Optimizations based on feedback * Validate CA keys for external sshd * Add filename option and change default filename Add a SSH_TRUSTED_USER_CA_KEYS_FILENAME option which default is RUN_USER/.ssh/gitea-trusted-user-ca-keys.pem Do not write a file when SSH_TRUSTED_USER_CA_KEYS is empty. Add some more documentation. * Remove unneeded principalkey functions * Add blank line * Apply suggestions from code review Co-authored-by: zeripath <art27@cantab.net> * Add SSH_AUTHORIZED_PRINCIPALS_ALLOW option This adds a SSH_AUTHORIZED_PRINCIPALS_ALLOW which is default email,username this means that users only can add the principals that match their email or username. To allow anything the admin need to set the option anything. This allows for a safe default in gitea which protects against malicious users using other user's prinicipals. (before that user could set it). This commit also has some small other fixes from the last code review. * Rewrite principal keys file on user deletion * Use correct rewrite method * Set correct AuthorizedPrincipalsBackup default setting * Rewrite principalsfile when adding principals * Add update authorized_principals option to admin dashboard * Handle non-primary emails Signed-off-by: Andrew Thornton <art27@cantab.net> * Add the command actually to the dashboard template * Update models/ssh_key.go Co-authored-by: silverwind <me@silverwind.io> * By default do not show principal options unless there are CA keys set or they are explicitly set Signed-off-by: Andrew Thornton <art27@cantab.net> * allow settings when enabled * Fix typos in TrustedUserCAKeys path * Allow every CASignatureAlgorithms algorithm As this depends on the content of TrustedUserCAKeys we should allow all signature algorithms as admins can choose the specific algorithm on their signing CA * Update models/ssh_key.go Co-authored-by: Lauris BH <lauris@nix.lv> * Fix linting issue Co-authored-by: silverwind <me@silverwind.io> Co-authored-by: zeripath <art27@cantab.net> Co-authored-by: Lauris BH <lauris@nix.lv> Co-authored-by: techknowlogick <matti@mdranta.net> Co-authored-by: techknowlogick <techknowlogick@gitea.io>
2020-10-11 02:38:09 +02:00
log.Error("SearchPublicKeyByContentExact: %v", err)
return false
}
c := &gossh.CertChecker{
IsUserAuthority: func(auth gossh.PublicKey) bool {
for _, k := range setting.SSH.TrustedUserCAKeysParsed {
if bytes.Equal(auth.Marshal(), k.Marshal()) {
return true
}
}
return false
},
}
// check the CA of the cert
if !c.IsUserAuthority(cert.SignatureKey) {
if log.IsDebug() {
log.Debug("Principal Rejected: %s Untrusted Authority Signature Fingerprint %s for Principal: %s", ctx.RemoteAddr(), gossh.FingerprintSHA256(cert.SignatureKey), principal)
}
continue principalLoop
Add ssh certificate support (#12281) * Add ssh certificate support * Add ssh certificate support to builtin ssh * Write trusted-user-ca-keys.pem based on configuration * Update app.example.ini * Update templates/user/settings/keys_principal.tmpl Co-authored-by: silverwind <me@silverwind.io> * Remove unused locale string * Update options/locale/locale_en-US.ini Co-authored-by: silverwind <me@silverwind.io> * Update options/locale/locale_en-US.ini Co-authored-by: silverwind <me@silverwind.io> * Update models/ssh_key.go Co-authored-by: silverwind <me@silverwind.io> * Add missing creation of SSH.Rootpath * Update cheatsheet, example and locale strings * Update models/ssh_key.go Co-authored-by: zeripath <art27@cantab.net> * Update models/ssh_key.go Co-authored-by: zeripath <art27@cantab.net> * Update models/ssh_key.go Co-authored-by: zeripath <art27@cantab.net> * Update models/ssh_key.go Co-authored-by: zeripath <art27@cantab.net> * Update models/ssh_key.go * Optimizations based on feedback * Validate CA keys for external sshd * Add filename option and change default filename Add a SSH_TRUSTED_USER_CA_KEYS_FILENAME option which default is RUN_USER/.ssh/gitea-trusted-user-ca-keys.pem Do not write a file when SSH_TRUSTED_USER_CA_KEYS is empty. Add some more documentation. * Remove unneeded principalkey functions * Add blank line * Apply suggestions from code review Co-authored-by: zeripath <art27@cantab.net> * Add SSH_AUTHORIZED_PRINCIPALS_ALLOW option This adds a SSH_AUTHORIZED_PRINCIPALS_ALLOW which is default email,username this means that users only can add the principals that match their email or username. To allow anything the admin need to set the option anything. This allows for a safe default in gitea which protects against malicious users using other user's prinicipals. (before that user could set it). This commit also has some small other fixes from the last code review. * Rewrite principal keys file on user deletion * Use correct rewrite method * Set correct AuthorizedPrincipalsBackup default setting * Rewrite principalsfile when adding principals * Add update authorized_principals option to admin dashboard * Handle non-primary emails Signed-off-by: Andrew Thornton <art27@cantab.net> * Add the command actually to the dashboard template * Update models/ssh_key.go Co-authored-by: silverwind <me@silverwind.io> * By default do not show principal options unless there are CA keys set or they are explicitly set Signed-off-by: Andrew Thornton <art27@cantab.net> * allow settings when enabled * Fix typos in TrustedUserCAKeys path * Allow every CASignatureAlgorithms algorithm As this depends on the content of TrustedUserCAKeys we should allow all signature algorithms as admins can choose the specific algorithm on their signing CA * Update models/ssh_key.go Co-authored-by: Lauris BH <lauris@nix.lv> * Fix linting issue Co-authored-by: silverwind <me@silverwind.io> Co-authored-by: zeripath <art27@cantab.net> Co-authored-by: Lauris BH <lauris@nix.lv> Co-authored-by: techknowlogick <matti@mdranta.net> Co-authored-by: techknowlogick <techknowlogick@gitea.io>
2020-10-11 02:38:09 +02:00
}
// validate the cert for this principal
if err := c.CheckCert(principal, cert); err != nil {
// User is presenting an invalid certificate - STOP any further processing
if log.IsError() {
log.Error("Invalid Certificate KeyID %s with Signature Fingerprint %s presented for Principal: %s from %s", cert.KeyId, gossh.FingerprintSHA256(cert.SignatureKey), principal, ctx.RemoteAddr())
}
log.Warn("Failed authentication attempt from %s", ctx.RemoteAddr())
Add ssh certificate support (#12281) * Add ssh certificate support * Add ssh certificate support to builtin ssh * Write trusted-user-ca-keys.pem based on configuration * Update app.example.ini * Update templates/user/settings/keys_principal.tmpl Co-authored-by: silverwind <me@silverwind.io> * Remove unused locale string * Update options/locale/locale_en-US.ini Co-authored-by: silverwind <me@silverwind.io> * Update options/locale/locale_en-US.ini Co-authored-by: silverwind <me@silverwind.io> * Update models/ssh_key.go Co-authored-by: silverwind <me@silverwind.io> * Add missing creation of SSH.Rootpath * Update cheatsheet, example and locale strings * Update models/ssh_key.go Co-authored-by: zeripath <art27@cantab.net> * Update models/ssh_key.go Co-authored-by: zeripath <art27@cantab.net> * Update models/ssh_key.go Co-authored-by: zeripath <art27@cantab.net> * Update models/ssh_key.go Co-authored-by: zeripath <art27@cantab.net> * Update models/ssh_key.go * Optimizations based on feedback * Validate CA keys for external sshd * Add filename option and change default filename Add a SSH_TRUSTED_USER_CA_KEYS_FILENAME option which default is RUN_USER/.ssh/gitea-trusted-user-ca-keys.pem Do not write a file when SSH_TRUSTED_USER_CA_KEYS is empty. Add some more documentation. * Remove unneeded principalkey functions * Add blank line * Apply suggestions from code review Co-authored-by: zeripath <art27@cantab.net> * Add SSH_AUTHORIZED_PRINCIPALS_ALLOW option This adds a SSH_AUTHORIZED_PRINCIPALS_ALLOW which is default email,username this means that users only can add the principals that match their email or username. To allow anything the admin need to set the option anything. This allows for a safe default in gitea which protects against malicious users using other user's prinicipals. (before that user could set it). This commit also has some small other fixes from the last code review. * Rewrite principal keys file on user deletion * Use correct rewrite method * Set correct AuthorizedPrincipalsBackup default setting * Rewrite principalsfile when adding principals * Add update authorized_principals option to admin dashboard * Handle non-primary emails Signed-off-by: Andrew Thornton <art27@cantab.net> * Add the command actually to the dashboard template * Update models/ssh_key.go Co-authored-by: silverwind <me@silverwind.io> * By default do not show principal options unless there are CA keys set or they are explicitly set Signed-off-by: Andrew Thornton <art27@cantab.net> * allow settings when enabled * Fix typos in TrustedUserCAKeys path * Allow every CASignatureAlgorithms algorithm As this depends on the content of TrustedUserCAKeys we should allow all signature algorithms as admins can choose the specific algorithm on their signing CA * Update models/ssh_key.go Co-authored-by: Lauris BH <lauris@nix.lv> * Fix linting issue Co-authored-by: silverwind <me@silverwind.io> Co-authored-by: zeripath <art27@cantab.net> Co-authored-by: Lauris BH <lauris@nix.lv> Co-authored-by: techknowlogick <matti@mdranta.net> Co-authored-by: techknowlogick <techknowlogick@gitea.io>
2020-10-11 02:38:09 +02:00
return false
}
if log.IsDebug() { // <- FingerprintSHA256 is kinda expensive so only calculate it if necessary
log.Debug("Successfully authenticated: %s Certificate Fingerprint: %s Principal: %s", ctx.RemoteAddr(), gossh.FingerprintSHA256(key), principal)
}
Add ssh certificate support (#12281) * Add ssh certificate support * Add ssh certificate support to builtin ssh * Write trusted-user-ca-keys.pem based on configuration * Update app.example.ini * Update templates/user/settings/keys_principal.tmpl Co-authored-by: silverwind <me@silverwind.io> * Remove unused locale string * Update options/locale/locale_en-US.ini Co-authored-by: silverwind <me@silverwind.io> * Update options/locale/locale_en-US.ini Co-authored-by: silverwind <me@silverwind.io> * Update models/ssh_key.go Co-authored-by: silverwind <me@silverwind.io> * Add missing creation of SSH.Rootpath * Update cheatsheet, example and locale strings * Update models/ssh_key.go Co-authored-by: zeripath <art27@cantab.net> * Update models/ssh_key.go Co-authored-by: zeripath <art27@cantab.net> * Update models/ssh_key.go Co-authored-by: zeripath <art27@cantab.net> * Update models/ssh_key.go Co-authored-by: zeripath <art27@cantab.net> * Update models/ssh_key.go * Optimizations based on feedback * Validate CA keys for external sshd * Add filename option and change default filename Add a SSH_TRUSTED_USER_CA_KEYS_FILENAME option which default is RUN_USER/.ssh/gitea-trusted-user-ca-keys.pem Do not write a file when SSH_TRUSTED_USER_CA_KEYS is empty. Add some more documentation. * Remove unneeded principalkey functions * Add blank line * Apply suggestions from code review Co-authored-by: zeripath <art27@cantab.net> * Add SSH_AUTHORIZED_PRINCIPALS_ALLOW option This adds a SSH_AUTHORIZED_PRINCIPALS_ALLOW which is default email,username this means that users only can add the principals that match their email or username. To allow anything the admin need to set the option anything. This allows for a safe default in gitea which protects against malicious users using other user's prinicipals. (before that user could set it). This commit also has some small other fixes from the last code review. * Rewrite principal keys file on user deletion * Use correct rewrite method * Set correct AuthorizedPrincipalsBackup default setting * Rewrite principalsfile when adding principals * Add update authorized_principals option to admin dashboard * Handle non-primary emails Signed-off-by: Andrew Thornton <art27@cantab.net> * Add the command actually to the dashboard template * Update models/ssh_key.go Co-authored-by: silverwind <me@silverwind.io> * By default do not show principal options unless there are CA keys set or they are explicitly set Signed-off-by: Andrew Thornton <art27@cantab.net> * allow settings when enabled * Fix typos in TrustedUserCAKeys path * Allow every CASignatureAlgorithms algorithm As this depends on the content of TrustedUserCAKeys we should allow all signature algorithms as admins can choose the specific algorithm on their signing CA * Update models/ssh_key.go Co-authored-by: Lauris BH <lauris@nix.lv> * Fix linting issue Co-authored-by: silverwind <me@silverwind.io> Co-authored-by: zeripath <art27@cantab.net> Co-authored-by: Lauris BH <lauris@nix.lv> Co-authored-by: techknowlogick <matti@mdranta.net> Co-authored-by: techknowlogick <techknowlogick@gitea.io>
2020-10-11 02:38:09 +02:00
ctx.SetValue(giteaKeyID, pkey.ID)
return true
}
if log.IsWarn() {
log.Warn("From %s Fingerprint: %s is a certificate, but no valid principals found", ctx.RemoteAddr(), gossh.FingerprintSHA256(key))
log.Warn("Failed authentication attempt from %s", ctx.RemoteAddr())
}
return false
}
if log.IsDebug() { // <- FingerprintSHA256 is kinda expensive so only calculate it if necessary
log.Debug("Handle Public Key: %s Fingerprint: %s is not a certificate", ctx.RemoteAddr(), gossh.FingerprintSHA256(key))
Add ssh certificate support (#12281) * Add ssh certificate support * Add ssh certificate support to builtin ssh * Write trusted-user-ca-keys.pem based on configuration * Update app.example.ini * Update templates/user/settings/keys_principal.tmpl Co-authored-by: silverwind <me@silverwind.io> * Remove unused locale string * Update options/locale/locale_en-US.ini Co-authored-by: silverwind <me@silverwind.io> * Update options/locale/locale_en-US.ini Co-authored-by: silverwind <me@silverwind.io> * Update models/ssh_key.go Co-authored-by: silverwind <me@silverwind.io> * Add missing creation of SSH.Rootpath * Update cheatsheet, example and locale strings * Update models/ssh_key.go Co-authored-by: zeripath <art27@cantab.net> * Update models/ssh_key.go Co-authored-by: zeripath <art27@cantab.net> * Update models/ssh_key.go Co-authored-by: zeripath <art27@cantab.net> * Update models/ssh_key.go Co-authored-by: zeripath <art27@cantab.net> * Update models/ssh_key.go * Optimizations based on feedback * Validate CA keys for external sshd * Add filename option and change default filename Add a SSH_TRUSTED_USER_CA_KEYS_FILENAME option which default is RUN_USER/.ssh/gitea-trusted-user-ca-keys.pem Do not write a file when SSH_TRUSTED_USER_CA_KEYS is empty. Add some more documentation. * Remove unneeded principalkey functions * Add blank line * Apply suggestions from code review Co-authored-by: zeripath <art27@cantab.net> * Add SSH_AUTHORIZED_PRINCIPALS_ALLOW option This adds a SSH_AUTHORIZED_PRINCIPALS_ALLOW which is default email,username this means that users only can add the principals that match their email or username. To allow anything the admin need to set the option anything. This allows for a safe default in gitea which protects against malicious users using other user's prinicipals. (before that user could set it). This commit also has some small other fixes from the last code review. * Rewrite principal keys file on user deletion * Use correct rewrite method * Set correct AuthorizedPrincipalsBackup default setting * Rewrite principalsfile when adding principals * Add update authorized_principals option to admin dashboard * Handle non-primary emails Signed-off-by: Andrew Thornton <art27@cantab.net> * Add the command actually to the dashboard template * Update models/ssh_key.go Co-authored-by: silverwind <me@silverwind.io> * By default do not show principal options unless there are CA keys set or they are explicitly set Signed-off-by: Andrew Thornton <art27@cantab.net> * allow settings when enabled * Fix typos in TrustedUserCAKeys path * Allow every CASignatureAlgorithms algorithm As this depends on the content of TrustedUserCAKeys we should allow all signature algorithms as admins can choose the specific algorithm on their signing CA * Update models/ssh_key.go Co-authored-by: Lauris BH <lauris@nix.lv> * Fix linting issue Co-authored-by: silverwind <me@silverwind.io> Co-authored-by: zeripath <art27@cantab.net> Co-authored-by: Lauris BH <lauris@nix.lv> Co-authored-by: techknowlogick <matti@mdranta.net> Co-authored-by: techknowlogick <techknowlogick@gitea.io>
2020-10-11 02:38:09 +02:00
}
pkey, err := asymkey_model.SearchPublicKeyByContent(strings.TrimSpace(string(gossh.MarshalAuthorizedKey(key))))
if err != nil {
if asymkey_model.IsErrKeyNotExist(err) {
if log.IsWarn() {
log.Warn("Unknown public key: %s from %s", gossh.FingerprintSHA256(key), ctx.RemoteAddr())
log.Warn("Failed authentication attempt from %s", ctx.RemoteAddr())
}
return false
}
log.Error("SearchPublicKeyByContent: %v", err)
return false
2014-07-26 06:24:27 +02:00
}
if log.IsDebug() { // <- FingerprintSHA256 is kinda expensive so only calculate it if necessary
log.Debug("Successfully authenticated: %s Public Key Fingerprint: %s", ctx.RemoteAddr(), gossh.FingerprintSHA256(key))
}
ctx.SetValue(giteaKeyID, pkey.ID)
return true
2014-07-26 06:24:27 +02:00
}
// sshConnectionFailed logs a failed connection
// - this mainly exists to give a nice function name in logging
func sshConnectionFailed(conn net.Conn, err error) {
// Log the underlying error with a specific message
log.Warn("Failed connection from %s with error: %v", conn.RemoteAddr(), err)
// Log with the standard failed authentication from message for simpler fail2ban configuration
log.Warn("Failed authentication attempt from %s", conn.RemoteAddr())
}
2014-07-26 06:24:27 +02:00
// Listen starts a SSH server listens on given port.
func Listen(host string, port int, ciphers, keyExchanges, macs []string) {
srv := ssh.Server{
Addr: net.JoinHostPort(host, strconv.Itoa(port)),
PublicKeyHandler: publicKeyHandler,
Handler: sessionHandler,
ServerConfigCallback: func(ctx ssh.Context) *gossh.ServerConfig {
config := &gossh.ServerConfig{}
config.KeyExchanges = keyExchanges
config.MACs = macs
config.Ciphers = ciphers
return config
},
ConnectionFailedCallback: sshConnectionFailed,
// We need to explicitly disable the PtyCallback so text displays
// properly.
PtyCallback: func(ctx ssh.Context, pty ssh.Pty) bool {
return false
2014-07-26 06:24:27 +02:00
},
}
keys := make([]string, 0, len(setting.SSH.ServerHostKeys))
for _, key := range setting.SSH.ServerHostKeys {
isExist, err := util.IsExist(key)
if err != nil {
log.Fatal("Unable to check if %s exists. Error: %v", setting.SSH.ServerHostKeys, err)
}
if isExist {
keys = append(keys, key)
}
}
if len(keys) == 0 {
filePath := filepath.Dir(setting.SSH.ServerHostKeys[0])
2016-12-01 00:56:15 +01:00
if err := os.MkdirAll(filePath, os.ModePerm); err != nil {
Better logging (#6038) (#6095) * Panic don't fatal on create new logger Fixes #5854 Signed-off-by: Andrew Thornton <art27@cantab.net> * partial broken * Update the logging infrastrcture Signed-off-by: Andrew Thornton <art27@cantab.net> * Reset the skip levels for Fatal and Error Signed-off-by: Andrew Thornton <art27@cantab.net> * broken ncsa * More log.Error fixes Signed-off-by: Andrew Thornton <art27@cantab.net> * Remove nal * set log-levels to lowercase * Make console_test test all levels * switch to lowercased levels * OK now working * Fix vetting issues * Fix lint * Fix tests * change default logging to match current gitea * Improve log testing Signed-off-by: Andrew Thornton <art27@cantab.net> * reset error skip levels to 0 * Update documentation and access logger configuration * Redirect the router log back to gitea if redirect macaron log but also allow setting the log level - i.e. TRACE * Fix broken level caching * Refactor the router log * Add Router logger * Add colorizing options * Adjust router colors * Only create logger if they will be used * update app.ini.sample * rename Attribute ColorAttribute * Change from white to green for function * Set fatal/error levels * Restore initial trace logger * Fix Trace arguments in modules/auth/auth.go * Properly handle XORMLogger * Improve admin/config page * fix fmt * Add auto-compression of old logs * Update error log levels * Remove the unnecessary skip argument from Error, Fatal and Critical * Add stacktrace support * Fix tests * Remove x/sync from vendors? * Add stderr option to console logger * Use filepath.ToSlash to protect against Windows in tests * Remove prefixed underscores from names in colors.go * Remove not implemented database logger This was removed from Gogs on 4 Mar 2016 but left in the configuration since then. * Ensure that log paths are relative to ROOT_PATH * use path.Join * rename jsonConfig to logConfig * Rename "config" to "jsonConfig" to make it clearer * Requested changes * Requested changes: XormLogger * Try to color the windows terminal If successful default to colorizing the console logs * fixup * Colorize initially too * update vendor * Colorize logs on default and remove if this is not a colorizing logger * Fix documentation * fix test * Use go-isatty to detect if on windows we are on msys or cygwin * Fix spelling mistake * Add missing vendors * More changes * Rationalise the ANSI writer protection * Adjust colors on advice from @0x5c * Make Flags a comma separated list * Move to use the windows constant for ENABLE_VIRTUAL_TERMINAL_PROCESSING * Ensure matching is done on the non-colored message - to simpify EXPRESSION
2019-04-02 09:48:31 +02:00
log.Error("Failed to create dir %s: %v", filePath, err)
2016-12-01 00:56:15 +01:00
}
err := GenKeyPair(setting.SSH.ServerHostKeys[0])
2015-11-14 19:21:31 +01:00
if err != nil {
Better logging (#6038) (#6095) * Panic don't fatal on create new logger Fixes #5854 Signed-off-by: Andrew Thornton <art27@cantab.net> * partial broken * Update the logging infrastrcture Signed-off-by: Andrew Thornton <art27@cantab.net> * Reset the skip levels for Fatal and Error Signed-off-by: Andrew Thornton <art27@cantab.net> * broken ncsa * More log.Error fixes Signed-off-by: Andrew Thornton <art27@cantab.net> * Remove nal * set log-levels to lowercase * Make console_test test all levels * switch to lowercased levels * OK now working * Fix vetting issues * Fix lint * Fix tests * change default logging to match current gitea * Improve log testing Signed-off-by: Andrew Thornton <art27@cantab.net> * reset error skip levels to 0 * Update documentation and access logger configuration * Redirect the router log back to gitea if redirect macaron log but also allow setting the log level - i.e. TRACE * Fix broken level caching * Refactor the router log * Add Router logger * Add colorizing options * Adjust router colors * Only create logger if they will be used * update app.ini.sample * rename Attribute ColorAttribute * Change from white to green for function * Set fatal/error levels * Restore initial trace logger * Fix Trace arguments in modules/auth/auth.go * Properly handle XORMLogger * Improve admin/config page * fix fmt * Add auto-compression of old logs * Update error log levels * Remove the unnecessary skip argument from Error, Fatal and Critical * Add stacktrace support * Fix tests * Remove x/sync from vendors? * Add stderr option to console logger * Use filepath.ToSlash to protect against Windows in tests * Remove prefixed underscores from names in colors.go * Remove not implemented database logger This was removed from Gogs on 4 Mar 2016 but left in the configuration since then. * Ensure that log paths are relative to ROOT_PATH * use path.Join * rename jsonConfig to logConfig * Rename "config" to "jsonConfig" to make it clearer * Requested changes * Requested changes: XormLogger * Try to color the windows terminal If successful default to colorizing the console logs * fixup * Colorize initially too * update vendor * Colorize logs on default and remove if this is not a colorizing logger * Fix documentation * fix test * Use go-isatty to detect if on windows we are on msys or cygwin * Fix spelling mistake * Add missing vendors * More changes * Rationalise the ANSI writer protection * Adjust colors on advice from @0x5c * Make Flags a comma separated list * Move to use the windows constant for ENABLE_VIRTUAL_TERMINAL_PROCESSING * Ensure matching is done on the non-colored message - to simpify EXPRESSION
2019-04-02 09:48:31 +02:00
log.Fatal("Failed to generate private key: %v", err)
2015-11-14 19:21:31 +01:00
}
log.Trace("New private key is generated: %s", setting.SSH.ServerHostKeys[0])
keys = append(keys, setting.SSH.ServerHostKeys[0])
2015-11-14 19:21:31 +01:00
}
for _, key := range keys {
log.Info("Adding SSH host key: %s", key)
err := srv.SetOption(ssh.HostKeyFile(key))
if err != nil {
log.Error("Failed to set Host Key. %s", err)
}
2014-07-26 06:24:27 +02:00
}
// Workaround slightly broken behaviour in x/crypto/ssh/handshake.go:458-463
//
// Fundamentally the issue here is that HostKeyAlgos make the incorrect assumption
// that the PublicKey().Type() matches the signature algorithm.
//
// Therefore we need to add duplicates for the RSA with different signing algorithms.
signers := make([]ssh.Signer, 0, len(srv.HostSigners))
for _, signer := range srv.HostSigners {
if signer.PublicKey().Type() == "ssh-rsa" {
signers = append(signers,
&wrapSigner{
Signer: signer,
algorithm: gossh.SigAlgoRSASHA2512,
},
&wrapSigner{
Signer: signer,
algorithm: gossh.SigAlgoRSASHA2256,
},
)
}
signers = append(signers, signer)
}
srv.HostSigners = signers
go listen(&srv)
2014-07-26 06:24:27 +02:00
}
// wrapSigner wraps a signer and overrides its public key type with the provided algorithm
type wrapSigner struct {
ssh.Signer
algorithm string
}
// PublicKey returns an associated PublicKey instance.
func (s *wrapSigner) PublicKey() gossh.PublicKey {
return &wrapPublicKey{
PublicKey: s.Signer.PublicKey(),
algorithm: s.algorithm,
}
}
// Sign returns raw signature for the given data. This method
// will apply the hash specified for the keytype to the data using
// the algorithm assigned for this key
func (s *wrapSigner) Sign(rand io.Reader, data []byte) (*gossh.Signature, error) {
return s.Signer.(gossh.AlgorithmSigner).SignWithAlgorithm(rand, data, s.algorithm)
}
// wrapPublicKey wraps a PublicKey and overrides its type
type wrapPublicKey struct {
gossh.PublicKey
algorithm string
}
// Type returns the algorithm
func (k *wrapPublicKey) Type() string {
return k.algorithm
}
// GenKeyPair make a pair of public and private keys for SSH access.
// Public key is encoded in the format for inclusion in an OpenSSH authorized_keys file.
// Private Key generated is PEM encoded
func GenKeyPair(keyPath string) error {
privateKey, err := rsa.GenerateKey(rand.Reader, 4096)
if err != nil {
return err
}
privateKeyPEM := &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(privateKey)}
f, err := os.OpenFile(keyPath, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0600)
if err != nil {
return err
}
2019-06-12 21:41:28 +02:00
defer func() {
if err = f.Close(); err != nil {
log.Error("Close: %v", err)
}
}()
if err := pem.Encode(f, privateKeyPEM); err != nil {
return err
}
// generate public key
pub, err := gossh.NewPublicKey(&privateKey.PublicKey)
if err != nil {
return err
}
public := gossh.MarshalAuthorizedKey(pub)
p, err := os.OpenFile(keyPath+".pub", os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0600)
if err != nil {
return err
}
2019-06-12 21:41:28 +02:00
defer func() {
if err = p.Close(); err != nil {
log.Error("Close: %v", err)
}
}()
_, err = p.Write(public)
return err
}