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Added a user certificate signing client.

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This commit is contained in:
GRMrGecko 2020-06-20 16:34:59 -05:00
parent bda19c1939
commit 166a2285aa
7 changed files with 1456 additions and 0 deletions
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11
etc/ssh-ca/user-client.json Executable file
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{
"CertServer": "https://ssh-ca.example.com",
"SignOptions": {
"Environment": "server",
"APIKey": "RANDOM_STRING",
"KeyPath": "/etc/ssh-ca/id_server_cert",
"UID": 993,
"GID": 989,
"Duration": 86400
}
}

3
ssh-user-client/build.sh Executable file
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#!/bin/bash
go build -ldflags "-s -w"

176
ssh-user-client/config.go Executable file
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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
KeyDefaults struct {
Type string `default:"OKP"`
Curve string `default:"Ed25519"`
Size int `default:"2048"`
}
Evironments []struct {
Name string `required:"true"`
SystemGroup string
APIKey string
SignOptions struct {
KeyID string `default:"USERNAME"`
ValidPrincipals []string
Options map[string]string
Extensions map[string]string
Duration time.Duration
}
}
SignOptions struct {
Environment string
APIKey string
KeyPath string
UID int
GID int
KeyID string
ValidPrincipals []string
Options map[string]string
Extensions map[string]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("./user-client.json")
homeDirConfig := usr.HomeDir + "/.config/ssh-ca/user-client.json"
etcConfig := "/etc/ssh-ca/user-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
}
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_-]+$`)
if len(config.Evironments) != 0 {
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
}
}
} else if config.SignOptions.KeyPath != "" {
if !validName.MatchString(config.SignOptions.Environment) {
fmt.Println("Invalid environment name")
foundError = true
}
} else {
fmt.Println("There has to be some key signing configuration, rather it be in SignOptions or Environments.")
foundError = true
}
if !foundError {
fmt.Println("All configurations appear to be fine.")
}
return nil
}

11
ssh-user-client/go.mod Executable file
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module github.com/grmrgecko/ssh-cert/ssh-user-client
go 1.14
require (
github.com/jinzhu/configor v1.1.1
github.com/pkg/errors v0.9.1
github.com/smallstep/cli v0.14.4
github.com/urfave/cli v1.22.3
golang.org/x/crypto v0.0.0-20200602180216-279210d13fed
)

636
ssh-user-client/go.sum Executable file
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@ -0,0 +1,636 @@
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github.com/smartystreets/goconvey v1.6.4/go.mod h1:syvi0/a8iFYH4r/RixwvyeAJjdLS9QV7WQ/tjFTllLA=
github.com/soheilhy/cmux v0.1.4/go.mod h1:IM3LyeVVIOuxMH7sFAkER9+bJ4dT7Ms6E4xg4kGIyLM=
github.com/sourcegraph/go-diff v0.5.1/go.mod h1:j2dHj3m8aZgQO8lMTcTnBcXkRRRqi34cd2MNlA9u1mE=
github.com/spaolacci/murmur3 v0.0.0-20180118202830-f09979ecbc72/go.mod h1:JwIasOWyU6f++ZhiEuf87xNszmSA2myDM2Kzu9HwQUA=
github.com/spaolacci/murmur3 v1.1.0/go.mod h1:JwIasOWyU6f++ZhiEuf87xNszmSA2myDM2Kzu9HwQUA=
github.com/spf13/afero v1.1.0/go.mod h1:j4pytiNVoe2o6bmDsKpLACNPDBIoEAkihy7loJ1B0CQ=
github.com/spf13/afero v1.1.2/go.mod h1:j4pytiNVoe2o6bmDsKpLACNPDBIoEAkihy7loJ1B0CQ=
github.com/spf13/afero v1.2.2/go.mod h1:9ZxEEn6pIJ8Rxe320qSDBk6AsU0r9pR7Q4OcevTdifk=
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github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
github.com/stretchr/objx v0.1.1/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
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github.com/subosito/gotenv v1.2.0/go.mod h1:N0PQaV/YGNqwC0u51sEeR/aUtSLEXKX9iv69rRypqCw=
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github.com/urfave/cli v1.20.0/go.mod h1:70zkFmudgCuE/ngEzBv17Jvp/497gISqfk5gWijbERA=
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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=
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github.com/weppos/publicsuffix-go v0.4.0/go.mod h1:z3LCPQ38eedDQSwmsSRW4Y7t2L8Ln16JPQ02lHAdn5k=
github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2/go.mod h1:UETIi67q53MR2AWcXfiuqkDkRtnGDLqkBTpCHuJHxtU=
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github.com/zmap/zcertificate v0.0.0-20190521191901-30e388164f71/go.mod h1:gIZi1KPgkZNUQzPZXsZrNnUnxy05nTc0+tmlqvIkhRw=
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go.etcd.io/bbolt v1.3.2/go.mod h1:IbVyRI1SCnLcuJnV2u8VeU0CEYM7e686BmAb1XKL+uU=
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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 v0.0.0-20200323165209-0ec3e9974c59/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
golang.org/x/crypto v0.0.0-20200602180216-279210d13fed h1:g4KENRiCMEx58Q7/ecwfT0N2o8z35Fnbsjig/Alf2T4=
golang.org/x/crypto v0.0.0-20200602180216-279210d13fed/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
golang.org/x/exp v0.0.0-20190306152737-a1d7652674e8/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
golang.org/x/exp v0.0.0-20190510132918-efd6b22b2522/go.mod h1:ZjyILWgesfNpC6sMxTJOJm9Kp84zZh5NQWvqDGG3Qr8=
golang.org/x/exp v0.0.0-20190829153037-c13cbed26979/go.mod h1:86+5VVa7VpoJ4kLfm080zCjGlMRFzhUhsZKEZO7MGek=
golang.org/x/exp v0.0.0-20191227195350-da58074b4299/go.mod h1:2RIsYlXP63K8oxa1u096TMicItID8zy7Y6sNkU49FU4=
golang.org/x/image v0.0.0-20190227222117-0694c2d4d067/go.mod h1:kZ7UVZpmo3dzQBMxlp+ypCbDeSB+sBbTgSJuh5dn5js=
golang.org/x/image v0.0.0-20190802002840-cff245a6509b/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
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golang.org/x/lint v0.0.0-20190301231843-5614ed5bae6f/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
golang.org/x/lint v0.0.0-20190313153728-d0100b6bd8b3/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
golang.org/x/lint v0.0.0-20190409202823-959b441ac422/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
golang.org/x/lint v0.0.0-20190909230951-414d861bb4ac/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/mobile v0.0.0-20190312151609-d3739f865fa6/go.mod h1:z+o9i4GpDbdi3rU15maQ/Ox0txvL9dWGYEHz965HBQE=
golang.org/x/mobile v0.0.0-20190719004257-d2bd2a29d028/go.mod h1:E/iHnbuqvinMTCcRqshq8CkpyQDoeVncDDYHnLhea+o=
golang.org/x/mod v0.0.0-20190513183733-4bf6d317e70e/go.mod h1:mXi4GBBbnImb6dmsKGUJ2LatrhH/nqhxcFungHvyanc=
golang.org/x/mod v0.1.0/go.mod h1:0QHyrYULN0/3qlju5TqG8bIK38QM8yzMo5ekMj3DlcY=
golang.org/x/mod v0.1.1-0.20191105210325-c90efee705ee/go.mod h1:QqPTAvyqsEbceGzBzNggFXnrqF1CaUcvgkdR5Ot7KZg=
golang.org/x/net v0.0.0-20170915142106-8351a756f30f/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20180906233101-161cd47e91fd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
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golang.org/x/net v0.0.0-20181114220301-adae6a3d119a/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20181220203305-927f97764cc3/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20190108225652-1e06a53dbb7e/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20190213061140-3a22650c66bd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20190301231341-16b79f2e4e95/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
golang.org/x/net v0.0.0-20190501004415-9ce7a6920f09/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
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google.golang.org/grpc v1.24.0/go.mod h1:XDChyiUovWa60DnaeDeZmSW86xtLtjtZbwvSiRnRtcA=
google.golang.org/grpc v1.26.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
gopkg.in/airbrake/gobrake.v2 v2.0.9/go.mod h1:/h5ZAUhDkGaJfjzjKLSjv6zCL6O0LLBxU4K+aSYdM/U=
gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
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gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
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 v2.4.0/go.mod h1:M9dMgbHiYLoDGQrXy7OpJDJWiKiU//h+vD76mk0e1AI=
gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
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gopkg.in/yaml.v2 v2.2.3/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.2.7 h1:VUgggvou5XRW9mHwD/yXxIYSMtY0zoKQf/v226p2nyo=
gopkg.in/yaml.v2 v2.2.7/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
howett.net/plist v0.0.0-20200419221736-3b63eb3a43b5/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=
mvdan.cc/unparam v0.0.0-20191111180625-960b1ec0f2c2/go.mod h1:rCqoQrfAmpTX/h2APczwM7UymU/uvaOluiVPIYCSY/k=
rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
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=

47
ssh-user-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-user-client"
app.Usage = "SSH Certificate Authority Toolkit - User Key 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 user 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)
}
}

572
ssh-user-client/sign.go Executable file
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@ -0,0 +1,572 @@
package main
/*
Signs all host keys.
*/
import (
"bufio"
"bytes"
"crypto"
"encoding/json"
"encoding/pem"
"fmt"
"io"
"io/ioutil"
"net/http"
"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"
)
// 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: "environment, e"},
cli.StringFlag{Name: "key, k"},
}
}
// 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)
// If we want to just sign a single key, pass it via the argument.
userKey := c.String("key")
// Filter the environments to a single environment.
environmentFilter := c.String("environment")
// If key path set in config or user key is passed in arguments,
// we will ignore environments in configuration and just sign the user key.
if config.SignOptions.KeyPath != "" || userKey != "" {
userPrivKey := config.SignOptions.KeyPath
if userKey != "" {
userPrivKey = userKey
}
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(config.SignOptions.UID), int(config.SignOptions.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(config.SignOptions.UID), int(config.SignOptions.GID))
}
// Setup a signing request.
sr := httpSignRequest{}
sr.Environment = config.SignOptions.Environment
sr.APIKey = config.SignOptions.APIKey
sr.Type = "user"
sr.KeyID = config.SignOptions.KeyID
sr.ValidPrincipals = config.SignOptions.ValidPrincipals
sr.Options = config.SignOptions.Options
sr.Extensions = config.SignOptions.Extensions
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 user public key.
pubKeyFile, err := ioutil.ReadFile(userPubKey)
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 && len(signResponse.SignedKeys) == 1 {
// 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(userPubKey, ".pub", "-cert.pub", 1)
// Save the certificate file.
f, err := os.Create(certKeyFile)
if err != nil {
return err
}
f.WriteString(signResponse.SignedKeys[0])
f.Close()
os.Chmod(certKeyFile, 0600)
os.Chown(certKeyFile, int(config.SignOptions.UID), int(config.SignOptions.GID))
} else {
fmt.Println("Response from server:")
// The request was not successful, so there is likely a message with an error.
fmt.Println(signResponse.Message)
}
} else {
// 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 == "" {
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))
}
// Setup a signing request.
sr := httpSignRequest{}
sr.Environment = environment.Name
sr.APIKey = environment.APIKey
sr.Type = "user"
// The key ID can have a place holder for the username.
keyID := environment.SignOptions.KeyID
keyID = strings.Replace(keyID, "USERNAME", user.Name, 10)
sr.KeyID = keyID
sr.ValidPrincipals = environment.SignOptions.ValidPrincipals
sr.Options = environment.SignOptions.Options
sr.Extensions = environment.SignOptions.Extensions
sr.Duration = environment.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 user public key.
pubKeyFile, err := ioutil.ReadFile(userPubKey)
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 && len(signResponse.SignedKeys) == 1 {
// 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(userPubKey, ".pub", "-cert.pub", 1)
// Save the certificate file.
f, err := os.Create(certKeyFile)
if err != nil {
return err
}
f.WriteString(signResponse.SignedKeys[0])
f.Close()
os.Chmod(certKeyFile, 0600)
os.Chown(certKeyFile, int(user.ID), int(user.GID))
fmt.Println("Signed key for", user.Name)
} else {
fmt.Println("Unable to sign key for", user.Name)
// The request was not successful, so there is likely a message with an error.
fmt.Println(signResponse.Message)
}
}
}
}
return nil
}