forked from TrueCloudLab/certificates
129 lines
3.7 KiB
Go
129 lines
3.7 KiB
Go
package templates
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import (
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"golang.org/x/crypto/ssh"
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)
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// Step represents the default variables available in the CA.
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type Step struct {
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SSH StepSSH
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}
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// StepSSH holds SSH-related values for the CA.
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type StepSSH struct {
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HostKey ssh.PublicKey
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UserKey ssh.PublicKey
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HostFederatedKeys []ssh.PublicKey
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UserFederatedKeys []ssh.PublicKey
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}
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// DefaultSSHTemplates 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 DefaultSSHTemplates = SSHTemplates{
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User: []Template{
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{
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Name: "include.tpl",
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Type: Snippet,
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TemplatePath: "templates/ssh/include.tpl",
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Path: "~/.ssh/config",
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Comment: "#",
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},
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{
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Name: "config.tpl",
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Type: File,
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TemplatePath: "templates/ssh/config.tpl",
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Path: "ssh/config",
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Comment: "#",
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},
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{
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Name: "known_hosts.tpl",
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Type: File,
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TemplatePath: "templates/ssh/known_hosts.tpl",
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Path: "ssh/known_hosts",
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Comment: "#",
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},
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},
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Host: []Template{
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{
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Name: "sshd_config.tpl",
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Type: Snippet,
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TemplatePath: "templates/ssh/sshd_config.tpl",
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Path: "/etc/ssh/sshd_config",
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Comment: "#",
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RequiredData: []string{"Certificate", "Key"},
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},
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{
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Name: "ca.tpl",
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Type: Snippet,
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TemplatePath: "templates/ssh/ca.tpl",
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Path: "/etc/ssh/ca.pub",
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Comment: "#",
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},
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},
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}
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// DefaultSSHTemplateData contains the data of the default templates used on ssh.
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var DefaultSSHTemplateData = map[string]string{
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// include.tpl adds the step ssh config file.
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//
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// Note: on windows `Include C:\...` is treated as a relative path.
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"include.tpl": `Host *
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{{- if or .User.GOOS "none" | eq "windows" }}
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Include "{{ .User.StepPath | replace "\\" "/" | trimPrefix "C:" }}/ssh/config"
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{{- else }}
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Include "{{.User.StepPath}}/ssh/config"
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{{- end }}`,
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// config.tpl is the step ssh config file, it includes the Match rule and
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// references the step known_hosts file.
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//
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// Note: on windows ProxyCommand requires the full path
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"config.tpl": `Match exec "step ssh check-host %h"
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{{- if .User.User }}
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User {{.User.User}}
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{{- end }}
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{{- if or .User.GOOS "none" | eq "windows" }}
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UserKnownHostsFile "{{.User.StepPath}}\ssh\known_hosts"
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ProxyCommand C:\Windows\System32\cmd.exe /c step ssh proxycommand %r %h %p
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{{- else }}
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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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{{- end }}
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`,
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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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// DefaultTemplates returns the default templates.
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func DefaultTemplates() *Templates {
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sshTemplates := DefaultSSHTemplates
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for i, t := range sshTemplates.User {
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sshTemplates.User[i].TemplatePath = ""
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sshTemplates.User[i].Content = []byte(DefaultSSHTemplateData[t.Name])
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}
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for i, t := range sshTemplates.Host {
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sshTemplates.Host[i].TemplatePath = ""
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sshTemplates.Host[i].Content = []byte(DefaultSSHTemplateData[t.Name])
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}
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return &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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