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Copyright (c) 2020 Mr. Gecko's Media (James Coleman). http://mrgeckosmedia.com/
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

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# SSH Certificate Authority Toolkit
This is a toolkit for configuring a SSH certificate authority, mainly designed with a jump box in mind with a setup similar to the following as an example.
On the jump box, we have 2 groups. `production` and `dev`, where the production team has access to production servers and the dev team has access to development servers. As the jump box is managed by a trusted party, we can setup a certificate authority which automatically creates and signs ssh keys to grant the users of each group access to the servers they need access to. As the jump box is also a certificate authority server, we are also able to sign host certificates for each server.
This allows for the following benefits.
1. Short lived certificates can be issued on a regular basis. In the default configuration, a certificate is issued for 1 hour. With a cron job setup to run every 30 minutes, all users gets updated certificates before they expire. This allows for user accounts to be deactivated without concern of a stolen ssh key possibly being able to access servers.
2. As all servers have a signed host key, time of first use (TOFU) warnings can be eliminated with all servers with a signed host key being trusted. Any server which throws a TOFU warning can be treated as suspicious or potentially compromised.
## Example configuration
On the jump box, create the `/etc/ssh-ca/` directory and place a copy of the example configuration `config.json` in etc (change parameters as needed).
Create the certificate authority keys for product, dev, and server host key signing.
```bash
ssh-keygen -t ed25519 -N '' -C ca_production@example.com -f /etc/ssh-ca/ssh_ca_production
chmod 600 /etc/ssh-ca/ssh_ca_production
ssh-keygen -t ed25519 -N '' -C ca_dev@example.com -f /etc/ssh-ca/ssh_ca_dev
chmod 600 /etc/ssh-ca/ssh_ca_dev
ssh-keygen -t ed25519 -N '' -C ca_server@example.com -f /etc/ssh-ca/ssh_ca_server
chmod 600 /etc/ssh-ca/ssh_ca_server
```
Create a cron job to sign user certificates on the jump box.
```
@reboot /usr/local/bin/ssh-cert sign >/dev/null 2>&1
*/30 * * * * /usr/local/bin/ssh-cert sign >/dev/null 2>&1
```
Run the command after setup to generate and signed keys for each user in the account groups defined in the configuration file.
On the jump box, install the ssh-cert service by copying the ssh-cert.service file from the etc directory to /etc/systend/system/. Enable/start as follows.
```bash
systemctl enable ssh-cert.service
systemctl start ssh-cert.service
```
On all servers, create the `/etc/ssh-ca/` directory and copy the example config `client.json` (change parameters as needed).
Create a cron job to sign the host certificates. You can randomize the hour/minute to have servers request for certificates at different time frames to minimize load.
```
@reboot /usr/local/bin/ssh-host-client sign >/dev/null 2>&1
0 0 1 * * /usr/local/bin/ssh-host-client sign >/dev/null 2>&1
```
Run the sign command after setup to ensure that the servers get a signed certificate.
Create a global `known_hosts` file that sets the certificate as a known host for all accounts.
```bash
echo -n "@cert-authority * " > /etc/ssh/ssh_known_hosts
cat /etc/ssh-ca/ssh_ca_server.pub >> /etc/ssh/ssh_known_hosts
```
You can either distribute this `known_hosts` file to each user account, or you can leave it in the global `known_hosts` file and remove the existing known hosts files from each account to remove old signatures from accounts.
```bash
find /home/ -name known_hosts -print -delete
```
With the signed ssh keys being named different from the default names, we need to configure the global ssh_config file to include the identity. Edit `/etc/ssh/ssh_config` and, under the `Host *` host match, add the following.
```
IdentityFile ~/.ssh/id_cert_production
IdentityFile ~/.ssh/id_cert_dev
IdentityFile ~/.ssh/id_ed25519
IdentityFile ~/.ssh/id_rsa
```
On each server, setup a `TrustedUserCAKeys` in the `/etc/ssh/sshd_config` configuration like the following.
```
TrustedUserCAKeys /etc/ssh/trusted-keys
```
In the `/etc/ssh/trusted-keys` file, put the public key(s) for the environment(s) this server allows connections. Example:
```
ssh-ed25519 AAAAC3AzaI1lDDI1NTE5AAAAICyHsn8hRNxbCh7FnX1EbwCDSSI+WT6CHHcPpSAMb6Gs ca_production@example.com
```
And with that change, your environment is now configured.
# Adding a new user account
Now that you have a configuration with this, you can easily add a user account that will receive a key. For an example, adding a user account for `john`.
```bash
USER=john
useradd $USER
usermod -a -G production $USER
mkdir /home/$USER/.ssh/; chown $USER: /home/$USER/.ssh/
/usr/local/bin/ssh-cert sign
```
You do not have to run the last line if you prefer to wait for the cron job to run.
# Special Notes
I highly recommend that you have Nginx/Caddy in-front of the signing server to add SSL and also all for more filtering. The signing server does not have SSL support by default, and while you must have the private keys for the returned certificates to be useful. Better safe than sorry. I have support for `X-Forwarded-For` which can be a security risk if someone knew a range you have authorized in the configuration.
Example Nginx configuration.
```nginx
server {
listen 80;
listen [::]:80;
server_name ssh-ca.example.com;
return 301 https://$host$request_uri;
}
server {
listen 443 ssl;
listen [::]:443 ssl;
server_name ssh-ca.example.com;
ssl_certificate /etc/letsencrypt/live/ssh-ca.example.com/fullchain.pem;
ssl_certificate_key /etc/letsencrypt/live/ssh-ca.example.com/privkey.pem;
ssl_protocols TLSv1.2 TLSv1.3;# Requires nginx >= 1.13.0 else use TLSv1.2
ssl_prefer_server_ciphers on;
ssl_dhparam /etc/nginx/dhparam.pem; # openssl dhparam -out /etc/nginx/dhparam.pem 4096
ssl_ciphers "EECDH+AESGCM:EDH+AESGCM:AES256+EECDH:AES256+EDH:ECDHE-RSA-AES128-GCM-SHA384:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA128:DHE-RSA-AES128-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES128-GCM-SHA128:ECDHE-RSA-AES128-SHA384:ECDHE-RSA-AES128-SHA128:ECDHE-RSA-AES128-SHA:ECDHE-RSA-AES128-SHA:DHE-RSA-AES128-SHA128:DHE-RSA-AES128-SHA128:DHE-RSA-AES128-SHA:DHE-RSA-AES128-SHA:ECDHE-RSA-DES-CBC3-SHA:EDH-RSA-DES-CBC3-SHA:AES128-GCM-SHA384:AES128-GCM-SHA128:AES128-SHA128:AES128-SHA128:AES128-SHA:AES128-SHA:DES-CBC3-SHA:HIGH:!aNULL:!eNULL:!EXPORT:!DES:!MD5:!PSK:!RC4";
ssl_ecdh_curve secp384r1; # Requires nginx >= 1.1.0
ssl_session_timeout 10m;
ssl_session_cache shared:SSL:10m;
ssl_session_tickets off; # Requires nginx >= 1.5.9
ssl_stapling on; # Requires nginx >= 1.3.7
ssl_stapling_verify on; # Requires nginx => 1.3.7
resolver 8.8.4.4 8.8.8.8 valid=300s;
resolver_timeout 5s;
add_header X-Frame-Options DENY;
add_header X-Content-Type-Options nosniff;
add_header X-XSS-Protection "1; mode=block";
access_log /dev/null;
error_log /dev/null;
location / {
proxy_pass http://127.0.0.1:7789;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Remote-Port $remote_port;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_redirect off;
}
}
```

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package main
import (
"fmt"
"log"
"net"
"os"
"os/user"
"path/filepath"
"regexp"
"time"
"github.com/jinzhu/configor"
"github.com/urfave/cli"
)
// Configuration Structure.
type Config struct {
BindAddr string `default:""`
Port uint `default:"7789"`
KeyDefaults struct {
Type string `default:"OKP"`
Curve string `default:"Ed25519"`
Size int `default:"2048"`
}
Evironments []struct {
Name string `required:"true"`
CAKeyFile string `required:"true"`
SystemGroup string
APIServer bool `default:"false"`
APIKey string
APIWhitelist []string
HostKey bool `default:"false"`
UserKey bool `default:"false"`
SignOptions struct {
KeyID string `default:"USERNAME"`
AllowAPIOverrideKeyID bool `default:"false"`
ValidPrincipals []string
AllowAPIOverrideValidPrincipals bool `default:"false"`
Options map[string]string
AllowAPIOverrideOptions bool `default:"false"`
Extensions map[string]string
AllowAPIOverrideExtensions bool `default:"false"`
Duration time.Duration `default:"3600"`
AllowAPIOverrideDuration bool `default:"false"`
}
}
}
// Load the configuration.
func initConfig(c *cli.Context) Config {
usr, err := user.Current()
if err != nil {
log.Fatal(err)
}
// Configuration paths.
localConfig, _ := filepath.Abs("./config.json")
homeDirConfig := usr.HomeDir + "/.config/ssh-ca/config.json"
etcConfig := "/etc/ssh-ca/config.json"
// Determine which configuration to use.
var configFile string
if _, err := os.Stat(c.String("config")); err == nil {
configFile = c.String("config")
} else if _, err := os.Stat(localConfig); err == nil {
configFile = localConfig
} else if _, err := os.Stat(homeDirConfig); err == nil {
configFile = homeDirConfig
} else if _, err := os.Stat(etcConfig); err == nil {
configFile = etcConfig
} else {
log.Fatal("Unable to find a configuration file.")
}
// Load the configuration file.
config := Config{}
err = configor.Load(&config, configFile)
if config.Port == 0 {
fmt.Println(err)
log.Fatal("Unable to load the configuration file.")
}
return config
}
// Flags for the server command.
func configTestFlags() []cli.Flag {
return []cli.Flag{}
}
func configTest(c *cli.Context) error {
config := initConfig(c)
foundError := false
if config.BindAddr != "" && net.ParseIP(config.BindAddr) == nil {
fmt.Println("Invalid bind address.")
foundError = true
}
if config.Port > 65535 {
fmt.Println("Invalid port number.")
foundError = true
}
switch config.KeyDefaults.Type {
case "EC":
switch config.KeyDefaults.Curve {
case "P-256":
case "P-384":
case "P-521":
// We are valid.
break
default:
fmt.Println("Invalid curve setting in KeyDefaults.")
foundError = true
}
break
case "RSA":
switch config.KeyDefaults.Size {
case 512:
case 1024:
case 2048:
case 4096:
case 8192:
case 16384:
// We are valid.
break
default:
fmt.Println("Invalid size setting in KeyDefaults.")
foundError = true
}
break
case "OKP":
if config.KeyDefaults.Curve != "Ed25519" {
fmt.Println("Invalid curve setting in KeyDefaults.")
foundError = true
}
break
case "oct":
// We are valid.
break
default:
fmt.Println("Invalid key type in KeyDefaults.")
foundError = true
}
var validName = regexp.MustCompile(`^[a-zA-Z0-9_-]+$`)
for _, environment := range config.Evironments {
if !validName.MatchString(environment.Name) {
fmt.Println("Invalid environment name:", environment.Name)
foundError = true
}
if environment.SystemGroup != "" && !validName.MatchString(environment.SystemGroup) {
fmt.Println("Invalid environment system group:", environment.SystemGroup)
foundError = true
}
if _, err := os.Stat(environment.CAKeyFile); err != nil {
fmt.Println("Key file does not exist:", environment.CAKeyFile)
foundError = true
}
}
if !foundError {
fmt.Println("All configurations appear to be fine.")
}
return nil
}

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{
"CertServer": "https://ssh-ca.example.com",
"SignOptions": {
"Environment": "server",
"APIKey": "RANDOM_STRING"
}
}

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{
"Evironments": [
{
"Name": "production",
"CAKeyFile": "/etc/ssh-ca/ssh_ca_production",
"SystemGroup": "production",
"UserKey": true,
"SignOptions": {
"KeyID": "USERNAME@example.com",
"ValidPrincipals": [
"root"
],
"Extensions": {
"permit-X11-forwarding": "",
"permit-agent-forwarding": "",
"permit-port-forwarding": "",
"permit-pty": "",
"permit-user-rc": ""
}
}
},
{
"Name": "dev",
"CAKeyFile": "/etc/ssh-ca/ssh_ca_dev",
"SystemGroup": "dev",
"UserKey": true,
"SignOptions": {
"KeyID": "USERNAME@example.com",
"ValidPrincipals": [
"root"
],
"Extensions": {
"permit-X11-forwarding": "",
"permit-agent-forwarding": "",
"permit-port-forwarding": "",
"permit-pty": "",
"permit-user-rc": ""
}
}
},
{
"Name": "server",
"CAKeyFile": "/etc/ssh-ca/ssh_ca_server",
"APIServer": true,
"APIKey": "RANDOM_STRING",
"APIWhitelist": [
"1.1.1.0/24"
],
"HostKey": true,
"SignOptions": {
"AllowAPIOverrideKeyID": true,
"Duration": 31557600
}
}
]
}

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[Unit]
Description=ssh-cert CA Server
After=network.target
[Service]
Type=simple
ExecStart=/usr/local/bin/ssh-cert server
Restart=on-failure
RestartSec=10
[Install]
WantedBy=multi-user.target

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module github.com/grmrgecko/ssh-cert
go 1.14
require (
github.com/jinzhu/configor v1.1.1
github.com/manifoldco/promptui v0.7.0 // indirect
github.com/pkg/errors v0.9.1
github.com/smallstep/cli v0.14.0-rc.3
github.com/stretchr/testify v1.5.1 // indirect
github.com/urfave/cli v1.22.2
golang.org/x/crypto v0.0.0-20200302210943-78000ba7a073
)

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cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
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cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
contrib.go.opencensus.io/exporter/stackdriver v0.12.1/go.mod h1:iwB6wGarfphGGe/e5CWqyUk/cLzKnWsOKPVW3no6OTw=
contrib.go.opencensus.io/resource v0.1.1/go.mod h1:F361eGI91LCmW1I/Saf+rX0+OFcigGlFvXwEGEnkRLA=
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github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
github.com/Masterminds/glide v0.13.2/go.mod h1:STyF5vcenH/rUqTEv+/hBXlSTo7KYwg2oc2f4tzPWic=
github.com/Masterminds/goutils v1.1.0/go.mod h1:8cTjp+g8YejhMuvIA5y2vz3BpJxksy863GQaJW2MFNU=
github.com/Masterminds/semver v1.4.2/go.mod h1:MB6lktGJrhw8PrUyiEoblNEGEQ+RzHPF078ddwwvV3Y=
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github.com/Microsoft/go-winio v0.4.14/go.mod h1:qXqCSQ3Xa7+6tgxaGTIe4Kpcdsi+P8jBhyzoq1bpyYA=
github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
github.com/OpenPeeDeeP/depguard v1.0.0/go.mod h1:7/4sitnI9YlQgTLLk734QlzXT8DuHVnAyztLplQjk+o=
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github.com/ThomasRooney/gexpect v0.0.0-20161231170123-5482f0350944/go.mod h1:sPML5WwI6oxLRLPuuqbtoOKhtmpVDCYtwsps+I+vjIY=
github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
github.com/antihax/optional v0.0.0-20180407024304-ca021399b1a6/go.mod h1:V8iCPQYkqmusNa815XgQio277wI47sdRh1dUOLdyC6Q=
github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6/go.mod h1:grANhF5doyWs3UAsr3K4I6qtAmlQcZDesFNEHPZAzj8=
github.com/asaskevich/govalidator v0.0.0-20180315120708-ccb8e960c48f/go.mod h1:lB+ZfQJz7igIIfQNfa7Ml4HSf2uFQQRzpGGRXenZAgY=
github.com/asaskevich/govalidator v0.0.0-20190424111038-f61b66f89f4a/go.mod h1:lB+ZfQJz7igIIfQNfa7Ml4HSf2uFQQRzpGGRXenZAgY=
github.com/asaskevich/govalidator v0.0.0-20200108200545-475eaeb16496/go.mod h1:oGkLhpf+kjZl6xBf758TQhh5XrAeiJv/7FRz/2spLIg=
github.com/aws/aws-sdk-go v1.19.18/go.mod h1:KmX6BPdI08NWTb3/sm4ZGu5ShLoqVDhKgpiN924inxo=
github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
github.com/bgentry/speakeasy v0.1.0/go.mod h1:+zsyZBPWlz7T6j88CTgSN5bM796AkVf0kBD4zp0CCIs=
github.com/bombsimon/wsl/v2 v2.0.0/go.mod h1:mf25kr/SqFEPhhcxW1+7pxzGlW+hIl/hYTKY95VwV8U=
github.com/boombuler/barcode v1.0.0/go.mod h1:paBWMcWSl3LHKBqUq+rly7CNSldXjb2rDl3JlRe0mD8=
github.com/census-instrumentation/opencensus-proto v0.2.0/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghfAqPWnc=
github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
github.com/chzyer/logex v1.1.10 h1:Swpa1K6QvQznwJRcfTfQJmTE72DqScAa40E+fbHEXEE=
github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
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github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI=
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github.com/grpc-ecosystem/go-grpc-middleware v1.0.0/go.mod h1:FiyG127CGDf3tlThmgyCl78X/SZQqEOJBCDaAfeWzPs=
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github.com/urfave/cli v1.22.2 h1:gsqYFH8bb9ekPA12kRo0hfjngWQjkJPlN9R0N78BoUo=
github.com/urfave/cli v1.22.2/go.mod h1:Gos4lmkARVdJ6EkW0WaNv/tZAAMe9V7XWyB60NtXRu0=
github.com/uudashr/gocognit v1.0.1/go.mod h1:j44Ayx2KW4+oB6SWMv8KsmHzZrOInQav7D3cQMJ5JUM=
github.com/valyala/bytebufferpool v1.0.0/go.mod h1:6bBcMArwyJ5K/AmCkWv1jt77kVWyCJ6HpOuEn7z0Csc=
github.com/valyala/fasthttp v1.2.0/go.mod h1:4vX61m6KN+xDduDNwXrhIAVZaZaZiQ1luJk8LWSxF3s=
github.com/valyala/quicktemplate v1.1.1/go.mod h1:EH+4AkTd43SvgIbQHYu59/cJyxDoOVRUAfrukLPuGJ4=
github.com/valyala/quicktemplate v1.2.0/go.mod h1:EH+4AkTd43SvgIbQHYu59/cJyxDoOVRUAfrukLPuGJ4=
github.com/valyala/tcplisten v0.0.0-20161114210144-ceec8f93295a/go.mod h1:v3UYOV9WzVtRmSR+PDvWpU/qWl4Wa5LApYYX4ZtKbio=
github.com/weppos/publicsuffix-go v0.4.0/go.mod h1:z3LCPQ38eedDQSwmsSRW4Y7t2L8Ln16JPQ02lHAdn5k=
github.com/weppos/publicsuffix-go v0.10.0/go.mod h1:z3LCPQ38eedDQSwmsSRW4Y7t2L8Ln16JPQ02lHAdn5k=
github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2/go.mod h1:UETIi67q53MR2AWcXfiuqkDkRtnGDLqkBTpCHuJHxtU=
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go.etcd.io/etcd v3.3.18+incompatible/go.mod h1:yaeTdrJi5lOmYerz05bd8+V7KubZs8YSFZfzsF9A6aI=
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go.opencensus.io v0.22.0/go.mod h1:+kGneAE2xo2IficOXnaByMWTGM9T73dGwxeWcUqIpI8=
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golang.org/x/crypto v0.0.0-20180904163835-0709b304e793/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
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golang.org/x/crypto v0.0.0-20190911031432-227b76d455e7/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
golang.org/x/crypto v0.0.0-20190923035154-9ee001bba392/go.mod h1:/lpIB1dKB+9EgE3H3cr1v9wB50oz8l4C4h62xy7jSTY=
golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
golang.org/x/crypto v0.0.0-20191227163750-53104e6ec876/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
golang.org/x/crypto v0.0.0-20200302210943-78000ba7a073 h1:xMPOj6Pz6UipU1wXLkrtqpHbR0AVFnyPEQq/wRWz9lM=
golang.org/x/crypto v0.0.0-20200302210943-78000ba7a073/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
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golang.org/x/lint v0.0.0-20190409202823-959b441ac422/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
golang.org/x/lint v0.0.0-20190930215403-16217165b5de/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
golang.org/x/lint v0.0.0-20191125180803-fdd1cda4f05f/go.mod h1:5qLYkcX4OjUUV8bRuDixDT3tpyyb+LUpUlRWLxfhWrs=
golang.org/x/mod v0.0.0-20190513183733-4bf6d317e70e/go.mod h1:mXi4GBBbnImb6dmsKGUJ2LatrhH/nqhxcFungHvyanc=
golang.org/x/mod v0.1.1-0.20191105210325-c90efee705ee/go.mod h1:QqPTAvyqsEbceGzBzNggFXnrqF1CaUcvgkdR5Ot7KZg=
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golang.org/x/net v0.0.0-20190613194153-d28f0bde5980/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/net v0.0.0-20190923162816-aa69164e4478/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/net v0.0.0-20191002035440-2ec189313ef0/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/net v0.0.0-20191209160850-c0dbc17a3553 h1:efeOvDhwQ29Dj3SdAV/MJf8oukgn+8D8WgaCaRMchF8=
golang.org/x/net v0.0.0-20191209160850-c0dbc17a3553/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
golang.org/x/oauth2 v0.0.0-20190226205417-e64efc72b421/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
golang.org/x/oauth2 v0.0.0-20190402181905-9f3314589c9a/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
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golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
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golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
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golang.org/x/sys v0.0.0-20171026204733-164713f0dfce/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20180202135801-37707fdb30a5/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
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golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20180909124046-d0be0721c37e/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20181107165924-66b7b1311ac8/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20181116152217-5ac8a444bdc5/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20181122145206-62eef0e2fa9b/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20181205085412-a5c9d58dba9a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
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golang.org/x/sys v0.0.0-20190312061237-fead79001313/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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golang.org/x/sys v0.0.0-20190502145724-3ef323f4f1fd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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golang.org/x/sys v0.0.0-20200106162015-b016eb3dc98e h1:LwyF2AFISC9nVbS6MgzsaQNSUsRXI49GS+YQ5KX/QH0=
golang.org/x/sys v0.0.0-20200106162015-b016eb3dc98e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
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golang.org/x/time v0.0.0-20191024005414-555d28b269f0/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
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golang.org/x/tools v0.0.0-20180221164845-07fd8470d635/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
golang.org/x/tools v0.0.0-20180525024113-a5b4c53f6e8b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
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golang.org/x/tools v0.0.0-20181030221726-6c7e314b6563/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
golang.org/x/tools v0.0.0-20181117154741-2ddaf7f79a09/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
golang.org/x/tools v0.0.0-20190110163146-51295c7ec13a/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
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gopkg.in/airbrake/gobrake.v2 v2.0.9/go.mod h1:/h5ZAUhDkGaJfjzjKLSjv6zCL6O0LLBxU4K+aSYdM/U=
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gopkg.in/cheggaaa/pb.v1 v1.0.28/go.mod h1:V/YB90LKu/1FcN3WVnfiiE5oMCibMjukxqG/qStrOgw=
gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
gopkg.in/gemnasium/logrus-airbrake-hook.v2 v2.1.2/go.mod h1:Xk6kEKp8OKb+X14hQBKWaSkCsqBpgog8nAV2xsGOxlo=
gopkg.in/ini.v1 v1.51.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
gopkg.in/ini.v1 v1.51.1/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
gopkg.in/square/go-jose.v2 v2.3.1/go.mod h1:M9dMgbHiYLoDGQrXy7OpJDJWiKiU//h+vD76mk0e1AI=
gopkg.in/square/go-jose.v2 v2.4.0/go.mod h1:M9dMgbHiYLoDGQrXy7OpJDJWiKiU//h+vD76mk0e1AI=
gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
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howett.net/plist v0.0.0-20181124034731-591f970eefbb/go.mod h1:vMygbs4qMhSZSc4lCUl2OEE+rDiIIJAIdR4m7MiMcm0=
mvdan.cc/interfacer v0.0.0-20180901003855-c20040233aed/go.mod h1:Xkxe497xwlCKkIaQYRfC7CSLworTXY9RMqwhhCm+8Nc=
mvdan.cc/lint v0.0.0-20170908181259-adc824a0674b/go.mod h1:2odslEg/xrtNQqCYg2/jCoyKnw3vv5biOc3JnIcYfL4=
mvdan.cc/unparam v0.0.0-20190209190245-fbb59629db34/go.mod h1:H6SUd1XjIs+qQCyskXg5OFSrilMRUkD8ePJpHKDPaeY=
mvdan.cc/unparam v0.0.0-20190720180237-d51796306d8f/go.mod h1:4G1h5nDURzA3bwVMZIVpwbkw+04kSxk3rAtzlimaUJw=
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sigs.k8s.io/yaml v1.1.0/go.mod h1:UJmg0vDUVViEyp3mgSv9WPwZCDxu4rQW1olrI1uml+o=
sourcegraph.com/sqs/pbtypes v0.0.0-20180604144634-d3ebe8f20ae4/go.mod h1:ketZ/q3QxT9HOBeFhu6RdvsftgpsbFHBF5Cas6cDKZ0=
sourcegraph.com/sqs/pbtypes v1.0.0/go.mod h1:3AciMUv4qUuRHRHhOG4TZOB+72GdPVz5k+c648qsFS4=

53
main.go Executable file
View File

@ -0,0 +1,53 @@
package main
/*
The SSH Certificate Authority Toolkit
*/
import (
"log"
"os"
"github.com/urfave/cli"
)
func main() {
app := cli.NewApp()
app.Name = "ssh-cert"
app.Usage = "SSH Certificate Authority Toolkit"
app.EnableBashCompletion = true
app.Version = "0.1"
app.Flags = []cli.Flag{
cli.StringFlag{
Name: "config, c",
Usage: "Load configuration from `FILE`",
},
}
app.Commands = []cli.Command{
{
Name: "sign",
Usage: "Sign user certificates for environments",
Flags: signFlags(),
Action: sign,
},
{
Name: "server",
Usage: "Run the API Server",
Flags: serverFlags(),
Action: runServer,
},
{
Name: "test",
Usage: "Test the configuration file to ensure it follows standards.",
Flags: configTestFlags(),
Action: configTest,
},
}
err := app.Run(os.Args)
if err != nil {
log.Fatal(err)
}
}

263
server.go Executable file
View File

@ -0,0 +1,263 @@
package main
/*
Run a API server for signing public keys.
*/
import (
"crypto/rand"
"encoding/json"
"fmt"
"io/ioutil"
"log"
"net"
"net/http"
"strings"
"time"
"github.com/urfave/cli"
"golang.org/x/crypto/ssh"
)
// Flags for the server command.
func serverFlags() []cli.Flag {
return []cli.Flag{
cli.StringFlag{Name: "bind, b"},
cli.UintFlag{Name: "port, p"},
}
}
// We need to read the server configuration on each request. So the server functions are apart of a http server struct.
type httpServer struct {
config Config
}
// Options available via a signing request.
type httpSignRequest struct {
Environment string
APIKey string
Type string
KeyID string
ValidPrincipals []string
Options map[string]string
Extensions map[string]string
PublicKeys []string
Duration time.Duration
}
// The standard API responses.
type httpSignResponse struct {
Successful bool
Message string
SignedKeys []string
}
// Standard function to send JSON responses.
func (s httpServer) JSONResponse(w http.ResponseWriter, resp interface{}) {
js, err := json.Marshal(resp)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/json")
w.Write(js)
}
// The sign request handler.
func (s httpServer) SignHandler(w http.ResponseWriter, r *http.Request) {
resp := httpSignResponse{}
// We only allow POST method with a JSON body.
if r.Method != "POST" {
http.Error(w, "Method Not Allowed", 405)
return
}
// Read the JSON body.
decoder := json.NewDecoder(r.Body)
var sr httpSignRequest
err := decoder.Decode(&sr)
if err != nil {
resp.Successful = false
resp.Message = err.Error()
s.JSONResponse(w, resp)
return
}
// Find the environment in the request.
for _, environment := range s.config.Evironments {
// Only if API key matches and the environment allows API requests.
if environment.Name == sr.Environment && environment.APIServer && environment.APIKey == sr.APIKey {
// Verify that the requested type is allowed in this environment.
if sr.Type == "host" && !environment.HostKey {
continue
} else if sr.Type == "user" && !environment.UserKey {
continue
}
// If the environment has a whitelist, verify the IP address of the request is whitelisted.
if len(environment.APIWhitelist) >= 1 {
allowed := false
clientIP := strings.Split(r.RemoteAddr, ":")[0]
// We recommend running the server behind a Nginx proxy with SSL.
// This X-Forwarded-For section is a security risk if not behind Nginx.
if r.Header.Get("X-Forwarded-For") != "" {
forwardedIPs := strings.Split(r.Header.Get("X-Forwarded-For"), ", ")
clientIP = forwardedIPs[len(forwardedIPs)-1]
}
for _, ipAddr := range environment.APIWhitelist {
if strings.Contains(ipAddr, "/") {
_, subnet, _ := net.ParseCIDR(ipAddr)
ip := net.ParseIP(clientIP)
if subnet.Contains(ip) {
allowed = true
break
}
} else if ipAddr == clientIP {
allowed = true
break
}
}
// If IP address of client does not match whitelisted IP addresses.
if !allowed {
resp.Successful = false
resp.Message = clientIP + " is Forbidden"
s.JSONResponse(w, resp)
return
}
}
// Read the environment's private key.
privKeyFile, err := ioutil.ReadFile(environment.CAKeyFile)
if err != nil {
log.Printf("Unable to read private key: %v", err)
resp.Successful = false
resp.Message = "Unable to read private key."
s.JSONResponse(w, resp)
return
}
// Create the Signer for this private key.
authority, err := ssh.ParsePrivateKey(privKeyFile)
if err != nil {
log.Printf("Unable to read private key: %v", err)
resp.Successful = false
resp.Message = "Unable to read private key."
s.JSONResponse(w, resp)
return
}
// Current time used for validation date range.
now := time.Now()
// Get options for sign request.
options := environment.SignOptions.Options
if environment.SignOptions.AllowAPIOverrideOptions && len(sr.Options) != 0 {
options = sr.Options
}
extensions := environment.SignOptions.Extensions
if environment.SignOptions.AllowAPIOverrideExtensions && len(sr.Extensions) != 0 {
options = sr.Extensions
}
keyID := environment.SignOptions.KeyID
if environment.SignOptions.AllowAPIOverrideKeyID && len(sr.KeyID) != 0 {
keyID = sr.KeyID
}
validPrincipals := environment.SignOptions.ValidPrincipals
if environment.SignOptions.AllowAPIOverrideValidPrincipals && len(sr.ValidPrincipals) != 0 {
validPrincipals = sr.ValidPrincipals
}
var certType uint32 = ssh.HostCert
if sr.Type == "user" {
certType = ssh.UserCert
}
duration := environment.SignOptions.Duration
if environment.SignOptions.AllowAPIOverrideDuration && sr.Duration != 0 {
duration = sr.Duration
}
for _, publicKey := range sr.PublicKeys {
// Read the provided public key.
pubKey, _, _, rest, err := ssh.ParseAuthorizedKey([]byte(publicKey))
if err != nil {
log.Printf("Unable to read public key: %v %v", err, publicKey)
resp.Successful = false
resp.Message = "Unable to read public key."
s.JSONResponse(w, resp)
return
}
if len(rest) > 0 {
log.Printf("rest: got %q, want empty %v", rest, publicKey)
resp.Successful = false
resp.Message = "Unable to read public key."
s.JSONResponse(w, resp)
return
}
// Create certificate.
cert := &ssh.Certificate{
Key: pubKey,
Serial: 0,
CertType: certType,
KeyId: keyID,
ValidPrincipals: validPrincipals,
ValidAfter: uint64(now.Add(-10 * time.Minute).Unix()),
ValidBefore: uint64(now.Add(time.Second * duration).Unix()),
Permissions: ssh.Permissions{
CriticalOptions: options,
Extensions: extensions,
},
}
// Sign the certificate.
cert.SignCert(rand.Reader, authority)
// Get the signed certificate in an authorized key format.
data := ssh.MarshalAuthorizedKey(cert)
resp.SignedKeys = append(resp.SignedKeys, string(data))
}
// Provide response.
resp.Successful = true
s.JSONResponse(w, resp)
return
}
}
// No environment was found that matches the request.
resp.Successful = false
resp.Message = "No environment found."
s.JSONResponse(w, resp)
}
// Start the server with provided options.
func runServer(c *cli.Context) error {
config := initConfig(c)
// Get the configuration/
bindAddr := config.BindAddr
port := config.Port
if c.String("bind") != "" {
bindAddr = c.String("bind")
}
if c.Uint("port") != 0 {
port = c.Uint("port")
}
// Create the server.
server := httpServer{}
server.config = config
// Set the handlers.
http.HandleFunc("/sign", server.SignHandler)
// Start the server.
fmt.Println("Starting server on port", port)
err := http.ListenAndServe(fmt.Sprintf("%s:%d", bindAddr, port), nil)
return err
}

410
sign.go Executable file
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@ -0,0 +1,410 @@
package main
/*
Generates keys and signs keys for users in each environment.
*/
import (
"bufio"
"crypto"
"crypto/rand"
"encoding/pem"
"fmt"
"io"
"io/ioutil"
"os"
"path/filepath"
"strconv"
"strings"
"time"
"github.com/pkg/errors"
"github.com/smallstep/cli/crypto/keys"
"github.com/smallstep/cli/crypto/pemutil"
"github.com/urfave/cli"
"golang.org/x/crypto/ssh"
)
// Flags for the sign command.
func signFlags() []cli.Flag {
return []cli.Flag{
cli.StringFlag{Name: "environment, e"},
}
}
// Group and user data structure.
type Group struct {
Name string
ID uint64
Users []string
}
type User struct {
Name string
ID uint64
GID uint64
FullName string
HomeDir string
Shell string
Disabled bool
}
// UNIX Accounts tool set designed to easily get a group or user's information.
type UNIXAccounts struct {
Groups []*Group
Users []*User
}
// Read the /etc/group and /etc/passwd files to parse information.
func (u *UNIXAccounts) init() error {
// We do not want to parse twice.
if len(u.Groups) != 0 || len(u.Users) != 0 {
return fmt.Errorf("Already parsed accounts.")
}
// Open the group file.
groupFile, err := os.Open("/etc/group")
if err != nil {
return err
}
defer groupFile.Close()
groupReader := bufio.NewReader(groupFile)
for {
// Read a line and truncate it.
line, err := groupReader.ReadString('\n')
line = strings.TrimSuffix(line, "\n")
// If end of line, we are done reading.
if err == io.EOF {
break
}
// If error, something is wrong.
if err != nil {
return err
}
// Ignore comments.
if line[0] == '#' {
continue
}
// Fields are separated with a :.
fields := strings.Split(line, ":")
// Groups should have 4 fields. Nothing more, nothing less.
if len(fields) != 4 {
continue
}
// Parse information.
group := new(Group)
group.Name = fields[0]
group.ID, _ = strconv.ParseUint(fields[2], 10, 32)
group.Users = strings.Split(fields[3], ",")
// Add group to array.
u.Groups = append(u.Groups, group)
}
// Open the user file.
passwdFile, err := os.Open("/etc/passwd")
if err != nil {
return err
}
defer passwdFile.Close()
passwdReader := bufio.NewReader(passwdFile)
for {
// Read a line and truncate it.
line, err := passwdReader.ReadString('\n')
line = strings.TrimSuffix(line, "\n")
// If end of line, we are done.
if err == io.EOF {
break
}
// If error, something is wrong.
if err != nil {
return err
}
// Ignore comments.
if line[0] == '#' {
continue
}
// Fields are separated with a :.
fields := strings.Split(line, ":")
// Users have 7 fields. No more or less.
if len(fields) != 7 {
continue
}
// Prase information.
user := new(User)
user.Name = fields[0]
user.ID, _ = strconv.ParseUint(fields[2], 10, 32)
user.GID, _ = strconv.ParseUint(fields[3], 10, 32)
user.FullName = fields[4]
user.HomeDir = filepath.Clean(fields[5])
user.Shell = fields[6]
// A user is disabled if their shell is set to nologin or false. Users with no shell should also be disabled.
user.Disabled = false
if strings.Contains(user.Shell, "nologin") {
user.Disabled = true
}
if strings.Contains(user.Shell, "false") {
user.Disabled = true
}
if user.Shell == "" {
user.Disabled = true
}
// Add user to array.
u.Users = append(u.Users, user)
}
return nil
}
// Find user info for ID.
func (u *UNIXAccounts) userWithID(id uint64) *User {
for _, user := range u.Users {
if user.ID == id {
return user
}
}
return nil
}
// Find user info for name.
func (u *UNIXAccounts) userWithName(name string) *User {
for _, user := range u.Users {
if user.Name == name {
return user
}
}
return nil
}
// Find group info for ID.
func (u *UNIXAccounts) groupWithID(id uint64) *Group {
for _, group := range u.Groups {
if group.ID == id {
return group
}
}
return nil
}
// Find group info for name.
func (u *UNIXAccounts) groupWithName(name string) *Group {
for _, group := range u.Groups {
if group.Name == name {
return group
}
}
return nil
}
// Get all user accounts which are members of a group.
func (u *UNIXAccounts) usersInGroup(group *Group) []*User {
var users []*User
// Users with the Group ID set to the group's ID are a member.
for _, user := range u.Users {
if user.GID == group.ID {
users = append(users, user)
}
}
// Find user info for each member.
for _, name := range group.Users {
user := u.userWithName(name)
if user == nil {
continue
}
// If the member was added previously, we do not want duplicates.
alreadyExists := false
for _, usr := range users {
if usr == user {
alreadyExists = true
break
}
}
if !alreadyExists {
// The member is not a duplicate, so we add it to the array.
users = append(users, user)
}
}
return users
}
// The sign command calls this function.
func sign(c *cli.Context) error {
// Load the configuration.
config := initConfig(c)
environmentFilter := c.String("environment")
// Get all UNIX Accounts.
accounts := new(UNIXAccounts)
err := accounts.init()
if err != nil {
return err
}
// Go through the environments.
for _, environment := range config.Evironments {
// If we are filtering to a sepcific environment, ones which are not that environment should be skipped.
if environmentFilter != "" && environmentFilter != environment.Name {
continue
}
// If the system group is not set or if this is not setup to sign user keys, we ignore this environment.
if environment.SystemGroup == "" || !environment.UserKey {
continue
}
fmt.Println("Signing keys for environment", environment.Name)
// Get the group for the environment from the UNIX Accounts.
group := accounts.groupWithName(environment.SystemGroup)
if group == nil {
continue
}
// Find all members of the group and loop to sign a key for each member.
users := accounts.usersInGroup(group)
for _, user := range users {
// If the user is disabled, we need to ignore.
if user.Disabled {
continue
}
// If the user does not already have an .ssh directory... We will ignore it.
if _, err := os.Stat(user.HomeDir + "/.ssh"); err != nil {
continue
}
// Get the path for the user key.
userPrivKey := user.HomeDir + "/.ssh/id_cert_" + environment.Name
userPubKey := userPrivKey + ".pub"
// If the user key was not generated, we need to make a new key.
if _, err := os.Stat(userPrivKey); err != nil {
// Make a key using our default type.
pub, priv, err := keys.GenerateKeyPair(config.KeyDefaults.Type, config.KeyDefaults.Curve, config.KeyDefaults.Size)
if err != nil {
return err
}
// If we cannot sign with the key, something is wrong.
if _, ok := priv.(crypto.Signer); !ok {
return errors.Errorf("key of type %T is not a crypto.Signer", priv)
}
// Get the public key in a form that we can generate an authorized key file.
sshKey, err := ssh.NewPublicKey(pub)
if err != nil {
return errors.Wrapf(err, "error converting public key")
}
// Get the private key in a format which can be saved to disk.
p, err := pemutil.Serialize(priv, pemutil.WithOpenSSH(true))
if err != nil {
return err
}
privKeyB := pem.EncodeToMemory(p)
// Prepare the authorized key.
pubKeyB := ssh.MarshalAuthorizedKey(sshKey)
// Save the private key.
f, err := os.Create(userPrivKey)
if err != nil {
return err
}
f.Write(privKeyB)
f.Close()
os.Chmod(userPrivKey, 0600)
os.Chown(userPrivKey, int(user.ID), int(user.GID))
// Save the public key.
f, err = os.Create(userPubKey)
if err != nil {
return err
}
f.Write(pubKeyB)
f.Close()
os.Chmod(userPubKey, 0600)
os.Chown(userPubKey, int(user.ID), int(user.GID))
}
// Read the environment's private key.
privKeyFile, err := ioutil.ReadFile(environment.CAKeyFile)
if err != nil {
return errors.Errorf("Unable to read private key: %v", err)
}
// Create the Signer for this private key.
authority, err := ssh.ParsePrivateKey(privKeyFile)
if err != nil {
return errors.Errorf("Unable to read private key: %v", err)
}
// Read the user's public key.
pubKeyFile, err := ioutil.ReadFile(userPubKey)
if err != nil {
return errors.Errorf("Unable to read public key: %v", err)
}
// Read the provided public key.
pubKey, _, _, rest, err := ssh.ParseAuthorizedKey(pubKeyFile)
if err != nil {
return errors.Errorf("Unable to read public key: %v", err)
}
if len(rest) > 0 {
return errors.Errorf("rest: got %q, want empty", rest)
}
// Current time used for validation date range.
now := time.Now()
// The key ID can have a place holder for the username.
keyID := environment.SignOptions.KeyID
keyID = strings.Replace(keyID, "USERNAME", user.Name, 10)
// Create certificate.
cert := &ssh.Certificate{
Key: pubKey,
Serial: 0,
CertType: ssh.UserCert,
KeyId: keyID,
ValidPrincipals: environment.SignOptions.ValidPrincipals,
ValidAfter: uint64(now.Add(-10 * time.Minute).Unix()),
ValidBefore: uint64(now.Add(time.Second * environment.SignOptions.Duration).Unix()),
Permissions: ssh.Permissions{
CriticalOptions: environment.SignOptions.Options,
Extensions: environment.SignOptions.Extensions,
},
}
// Sign the certificate.
cert.SignCert(rand.Reader, authority)
// Get the signed certificate in an authorized key format.
data := ssh.MarshalAuthorizedKey(cert)
// Save the certificate to disk.
certPath := userPrivKey + "-cert.pub"
f, err := os.Create(certPath)
if err != nil {
return err
}
f.Write(data)
f.Close()
os.Chmod(certPath, 0600)
os.Chown(certPath, int(user.ID), int(user.GID))
fmt.Println("Signed key for", user.Name)
}
}
return nil
}

3
ssh-host-client/build.sh Executable file
View File

@ -0,0 +1,3 @@
#!/bin/bash
go build -ldflags "-s -w"

91
ssh-host-client/config.go Executable file
View File

@ -0,0 +1,91 @@
package main
import (
"fmt"
"log"
"os"
"os/user"
"path/filepath"
"regexp"
"time"
"github.com/jinzhu/configor"
"github.com/urfave/cli"
)
// Configuration Structure.
type Config struct {
CertServer string
SignOptions struct {
Environment string
APIKey string
KeyID string
Duration time.Duration
}
}
// Load the configuration.
func initConfig(c *cli.Context) Config {
usr, err := user.Current()
if err != nil {
log.Fatal(err)
}
// Configuration paths.
localConfig, _ := filepath.Abs("./client.json")
homeDirConfig := usr.HomeDir + "/.config/ssh-ca/client.json"
etcConfig := "/etc/ssh-ca/client.json"
// Determine which configuration to use.
var configFile string
if _, err := os.Stat(c.String("config")); err == nil {
configFile = c.String("config")
} else if _, err := os.Stat(localConfig); err == nil {
configFile = localConfig
} else if _, err := os.Stat(homeDirConfig); err == nil {
configFile = homeDirConfig
} else if _, err := os.Stat(etcConfig); err == nil {
configFile = etcConfig
} else {
log.Fatal("Unable to find a configuration file.")
}
// Load the configuration file.
config := Config{}
err = configor.Load(&config, configFile)
if config.CertServer == "" {
fmt.Println(err)
log.Fatal("Unable to load the configuration file.")
}
return config
}
// Flags for the server command.
func configTestFlags() []cli.Flag {
return []cli.Flag{}
}
func configTest(c *cli.Context) error {
config := initConfig(c)
foundError := false
if config.CertServer == "" {
fmt.Println("Cert server address.")
foundError = true
}
var validName = regexp.MustCompile(`^[a-zA-Z0-9_-]+$`)
if !validName.MatchString(config.SignOptions.Environment) {
fmt.Println("Invalid environment name")
foundError = true
}
if !foundError {
fmt.Println("All configurations appear to be fine.")
}
return nil
}

9
ssh-host-client/go.mod Executable file
View File

@ -0,0 +1,9 @@
module github.com/grmrgecko/ssh-cert/ssh-host-client
go 1.14
require (
github.com/jinzhu/configor v1.1.1
github.com/pkg/errors v0.9.1
github.com/urfave/cli v1.22.3
)

18
ssh-host-client/go.sum Executable file
View File

@ -0,0 +1,18 @@
github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d h1:U+s90UTSYgptZMwQh2aRr3LuazLJIa+Pg3Kc1ylSYVY=
github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
github.com/jinzhu/configor v1.1.1 h1:gntDP+ffGhs7aJ0u8JvjCDts2OsxsI7bnz3q+jC+hSY=
github.com/jinzhu/configor v1.1.1/go.mod h1:nX89/MOmDba7ZX7GCyU/VIaQ2Ar2aizBl2d3JLF/rDc=
github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/russross/blackfriday/v2 v2.0.1 h1:lPqVAte+HuHNfhJ/0LC98ESWRz8afy9tM/0RK8m9o+Q=
github.com/russross/blackfriday/v2 v2.0.1/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
github.com/shurcooL/sanitized_anchor_name v1.0.0 h1:PdmoCO6wvbs+7yrJyMORt4/BmY5IYyJwS/kOiWx8mHo=
github.com/shurcooL/sanitized_anchor_name v1.0.0/go.mod h1:1NzhyTcUVG4SuEtjjoZeVRXNmyL/1OwPU0+IJeTBvfc=
github.com/urfave/cli v1.22.3 h1:FpNT6zq26xNpHZy08emi755QwzLPs6Pukqjlc7RfOMU=
github.com/urfave/cli v1.22.3/go.mod h1:Gos4lmkARVdJ6EkW0WaNv/tZAAMe9V7XWyB60NtXRu0=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

47
ssh-host-client/main.go Executable file
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@ -0,0 +1,47 @@
package main
/*
SSH Certificate Host Client
*/
import (
"log"
"os"
"github.com/urfave/cli"
)
func main() {
app := cli.NewApp()
app.Name = "ssh-host-client"
app.Usage = "SSH Certificate Authority Toolkit - Host Signing Client"
app.EnableBashCompletion = true
app.Version = "0.1"
app.Flags = []cli.Flag{
cli.StringFlag{
Name: "config, c",
Usage: "Load configuration from `FILE`",
},
}
app.Commands = []cli.Command{
{
Name: "sign",
Usage: "Sign host certificates.",
Flags: signFlags(),
Action: sign,
},
{
Name: "test",
Usage: "Test the configuration file to ensure it follows standards.",
Flags: configTestFlags(),
Action: configTest,
},
}
err := app.Run(os.Args)
if err != nil {
log.Fatal(err)
}
}

273
ssh-host-client/sign.go Executable file
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@ -0,0 +1,273 @@
package main
/*
Signs all host keys.
*/
import (
"bufio"
"bytes"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"net/http"
"os"
"strconv"
"strings"
"syscall"
"time"
"github.com/urfave/cli"
)
// Options available via a signing request.
type httpSignRequest struct {
Environment string
APIKey string
Type string
KeyID string
ValidPrincipals []string
Options map[string]string
Extensions map[string]string
PublicKeys []string
Duration time.Duration
}
// The standard API responses.
type httpSignResponse struct {
Successful bool
Message string
SignedKeys []string
}
// Flags for the sign command.
func signFlags() []cli.Flag {
return []cli.Flag{
cli.StringFlag{Name: "key, k"},
}
}
// The sign command calls this function.
func sign(c *cli.Context) error {
// Load the configuration.
config := initConfig(c)
// If we want to just sign a single key, pass it via the argument.
hostKey := c.String("key")
// All host key files.
var hostKeys []string
// If a host key file was provided, we just use it. Otherwise we find system host keys.
if hostKey != "" {
hostKeys = append(hostKeys, hostKey)
} else {
// Host keys are stored in /etc/ssh/.
files, err := ioutil.ReadDir("/etc/ssh/")
if err != nil {
return err
}
// Host keys end in .pub, but are not certificates.
for _, f := range files {
if strings.Contains(f.Name(), ".pub") && !strings.Contains(f.Name(), "-cert") && f.Name() != "ssh_host_key.pub" {
hostKeys = append(hostKeys, "/etc/ssh/"+f.Name())
}
}
}
// Setup a signing request.
sr := httpSignRequest{}
sr.Environment = config.SignOptions.Environment
sr.APIKey = config.SignOptions.APIKey
sr.Type = "host"
sr.KeyID = config.SignOptions.KeyID
sr.Duration = config.SignOptions.Duration
// If a key ID is not set in the configuration, we will use the hostname.
if sr.KeyID == "" {
sr.KeyID, _ = os.Hostname()
}
// Read the host keys into the signing request.
for _, hostKey := range hostKeys {
// Read the host public key.
pubKeyFile, err := ioutil.ReadFile(hostKey)
if err != nil {
return fmt.Errorf("Unable to read public key: %v", err)
}
sr.PublicKeys = append(sr.PublicKeys, string(pubKeyFile))
}
// Convert signing request into JSON for the request.
srData, err := json.Marshal(sr)
if err != nil {
return err
}
// Setup request.
req, _ := http.NewRequest("POST", config.CertServer+"/sign", bytes.NewBuffer(srData))
req.Header.Add("content-type", "application/json")
// Send the request.
res, err := http.DefaultClient.Do(req)
if err != nil {
return err
}
defer res.Body.Close()
// Parse the response.
var signResponse httpSignResponse
decoder := json.NewDecoder(res.Body)
err = decoder.Decode(&signResponse)
if err != nil {
return err
}
// If successful, we need to pull the signed keys and store them/update the sshd configurations.
if signResponse.Successful {
// The configuration file path.
sshdConfig := "/etc/ssh/sshd_config"
// Open the sshd_config file.
sshdConfigFile, err := os.Open(sshdConfig)
if err != nil {
return err
}
defer sshdConfigFile.Close()
configReader := bufio.NewReader(sshdConfigFile)
// We save our changes to the _new configuration file temporarily during edits.
newConfig, err := os.Create(sshdConfig + "_new")
if err != nil {
return err
}
// We go through the file until all host key configurations are found.
// Once found, we then insert our certificate configurations.
foundHostKeys := false
// This is the last line read that is not a host key configuration.
// We need to write this line after adding the certificate configurations.
var lastReadLine string
for {
// Read a line.
line, err := configReader.ReadString('\n')
// If end of line, we are done reading.
if err == io.EOF {
break
}
// If error, something is wrong.
if err != nil {
return err
}
// Configurations in sshd_config is white space separated. If a whitepsace is not found, it is not a configuration line.
i := strings.IndexByte(line, ' ')
if i != -1 {
// We pull the configuration name.
conf := line[:i]
// If we found the host keys already, we check to see if this line is another host key or host certificate.
// If it is not, we are done reading at this point and we need to store the line for writing after we isnert our config.
if foundHostKeys && conf != "HostKey" && conf != "HostCertificate" {
lastReadLine = line
break
}
// If this is a host certificate configuration, we need to ignore it.
if conf == "HostCertificate" {
continue
}
// If this is a host key configuration, we need to set the fact we found the host key configurations.
if conf == "HostKey" {
foundHostKeys = true
}
}
// Write this line to the new configuration.
newConfig.WriteString(line)
}
// Go through each of the signed keys, and save them/add to the sshd configuration.
for i, signedKey := range signResponse.SignedKeys {
// The signed key result should be in the same order we sent them,
// that means that the host key files will be in the same order.
// The name of the host certificate file is the same as the public key,
// but with `-cert` pre-pended to the extension.
certKeyFile := strings.Replace(hostKeys[i], ".pub", "-cert.pub", 1)
// Save the certificate file.
f, err := os.Create(certKeyFile)
if err != nil {
return err
}
f.WriteString(signedKey)
f.Close()
os.Chmod(certKeyFile, 0644)
// Append to the new sshd configuration file the certificate configuration.
newConfig.WriteString("HostCertificate " + certKeyFile + "\n")
}
// Append the line we last read before we inserted our host certificates.
newConfig.WriteString(lastReadLine)
for {
// Read the next line available.
line, err := configReader.ReadString('\n')
// If end of line, we are done reading.
if err == io.EOF {
break
}
// If error, something is wrong.
if err != nil {
return err
}
// Configurations in sshd_config is white space separated. If a whitepsace is not found, it is not a configuration line.
i := strings.IndexByte(line, ' ')
if i != -1 {
// We pull the configuration name.
conf := line[:i]
// If this is a host certificate configuration, we need to ignore it.
if conf == "HostCertificate" {
continue
}
}
// Write line to the new sshd configuration file.
newConfig.WriteString(line)
}
// We can finialize the new configuration file and replace the old one.
newConfig.Close()
err = os.Rename(sshdConfig+"_new", sshdConfig)
if err != nil {
return err
}
// We need the PID of sshd so that we can signal it to re-load its configuration file.
pidB, err := ioutil.ReadFile("/var/run/sshd.pid")
if err != nil {
return err
}
pid, err := strconv.Atoi(string(pidB[:len(pidB)-1]))
if err != nil {
return err
}
// Find the active process for SSHD based on its pid.
sshd, err := os.FindProcess(pid)
if err != nil {
return err
}
// Signal SSHD to reload its configuration file.
sshd.Signal(syscall.SIGHUP)
} else {
// The request was not successful, so there is likely a message with an error.
fmt.Println(signResponse.Message)
}
return nil
}