forked from TrueCloudLab/certificates
111 lines
3.5 KiB
Go
111 lines
3.5 KiB
Go
package pki
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import (
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"os"
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"path/filepath"
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"github.com/pkg/errors"
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"github.com/smallstep/certificates/templates"
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"github.com/smallstep/cli/config"
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"github.com/smallstep/cli/errs"
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"github.com/smallstep/cli/utils"
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)
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// sshTemplates contains the configuration of default templates used on ssh.
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// Relative paths are relative to the StepPath.
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var sshTemplates = &templates.SSHTemplates{
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User: []templates.Template{
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{Name: "include.tpl", Type: templates.Snippet, TemplatePath: "templates/ssh/include.tpl", Path: "~/.ssh/config", Comment: "#"},
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{Name: "config.tpl", Type: templates.File, TemplatePath: "templates/ssh/config.tpl", Path: "ssh/config", Comment: "#"},
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{Name: "known_hosts.tpl", Type: templates.File, TemplatePath: "templates/ssh/known_hosts.tpl", Path: "ssh/known_hosts", Comment: "#"},
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},
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Host: []templates.Template{
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{Name: "sshd_config.tpl", Type: templates.Snippet, TemplatePath: "templates/ssh/sshd_config.tpl", Path: "/etc/ssh/sshd_config", Comment: "#"},
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{Name: "ca.tpl", Type: templates.Snippet, TemplatePath: "templates/ssh/ca.tpl", Path: "/etc/ssh/ca.pub", Comment: "#"},
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},
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}
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// sshTemplateData contains the data of the default templates used on ssh.
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var sshTemplateData = map[string]string{
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// include.tpl adds the step ssh config file
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"include.tpl": `Host *
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Include {{.User.StepPath}}/ssh/config`,
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// config.tpl is the step ssh config file, it includes the Match rule
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// and references the step known_hosts file
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"config.tpl": `Match exec "step ssh check-host %h"
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ForwardAgent yes
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UserKnownHostsFile {{.User.StepPath}}/ssh/known_hosts
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ProxyCommand step ssh proxycommand %r %h %p`,
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// known_hosts.tpl authorizes the ssh hosts key
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"known_hosts.tpl": `@cert-authority * {{.Step.SSH.HostKey.Type}} {{.Step.SSH.HostKey.Marshal | toString | b64enc}}
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{{- range .Step.SSH.HostFederatedKeys}}
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@cert-authority * {{.Type}} {{.Marshal | toString | b64enc}}
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{{- end}}
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`,
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// sshd_config.tpl adds the configuration to support certificates
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"sshd_config.tpl": `TrustedUserCAKeys /etc/ssh/ca.pub
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HostCertificate /etc/ssh/{{.User.Certificate}}
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HostKey /etc/ssh/{{.User.Key}}`,
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// ca.tpl contains the public key used to authorized clients
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"ca.tpl": `{{.Step.SSH.UserKey.Type}} {{.Step.SSH.UserKey.Marshal | toString | b64enc}}
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{{- range .Step.SSH.UserFederatedKeys}}
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{{.Type}} {{.Marshal | toString | b64enc}}
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{{- end}}
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`,
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}
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// getTemplates returns all the templates enabled
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func (p *PKI) getTemplates() *templates.Templates {
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if !p.enableSSH {
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return nil
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}
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return &templates.Templates{
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SSH: sshTemplates,
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Data: map[string]interface{}{},
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}
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}
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// generateTemplates generates given templates.
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func generateTemplates(t *templates.Templates) error {
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if t == nil {
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return nil
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}
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base := GetTemplatesPath()
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// Generate SSH templates
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if t.SSH != nil {
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// all ssh templates are under ssh:
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sshDir := filepath.Join(base, "ssh")
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if _, err := os.Stat(sshDir); os.IsNotExist(err) {
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if err = os.MkdirAll(sshDir, 0700); err != nil {
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return errs.FileError(err, sshDir)
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}
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}
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// Create all templates
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for _, t := range t.SSH.User {
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data, ok := sshTemplateData[t.Name]
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if !ok {
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return errors.Errorf("template %s does not exists", t.Name)
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}
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if err := utils.WriteFile(config.StepAbs(t.TemplatePath), []byte(data), 0644); err != nil {
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return err
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}
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}
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for _, t := range t.SSH.Host {
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data, ok := sshTemplateData[t.Name]
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if !ok {
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return errors.Errorf("template %s does not exists", t.Name)
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}
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if err := utils.WriteFile(config.StepAbs(t.TemplatePath), []byte(data), 0644); err != nil {
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return err
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}
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}
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}
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return nil
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}
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