|
| 1 | +package main |
| 2 | + |
| 3 | +import ( |
| 4 | + "bytes" |
| 5 | + "crypto/tls" |
| 6 | + "encoding/json" |
| 7 | + "flag" |
| 8 | + "fmt" |
| 9 | + "io/ioutil" |
| 10 | + "log" |
| 11 | + "net/http" |
| 12 | + "os" |
| 13 | + "strings" |
| 14 | +) |
| 15 | + |
| 16 | +var ( |
| 17 | + url = flag.String("url", "https://localhost", "CFSSL URL") |
| 18 | + username = flag.String("user", "", "user name to use for basic auth") |
| 19 | + password = flag.String("password", "", "password to use for basic auth") |
| 20 | + verifySSL = flag.Bool("verifySSL", true, "Verify certificate chain") |
| 21 | + certType = flag.String("type", "client-server", "The certificatle type to request: server, client, client-server") |
| 22 | + certName = flag.String("name", "", "Only used for client certificates, for server and client-server we use the hostname as the identifier.") |
| 23 | + caCertURL = flag.String("ca_cert_url", "", "Specify an url where to downlaod the CA's certificate") |
| 24 | + dir = flag.String("dir", "/etc/certificates", "directory where to store the certificates") |
| 25 | + force = flag.Bool("force", false, "If certificates exist, overwrite them by requesting new certificates") |
| 26 | +) |
| 27 | + |
| 28 | +func main() { |
| 29 | + |
| 30 | + flag.Parse() |
| 31 | + |
| 32 | + if ok := reqClientCert(); !ok { |
| 33 | + log.Fatal("Failed to get retrieve a new certificate from cfssl") |
| 34 | + } |
| 35 | + os.Exit(0) |
| 36 | +} |
| 37 | + |
| 38 | +func reqClientCert() bool { |
| 39 | + log.Println("Requesting New certificates") |
| 40 | + jsonStr := "" |
| 41 | + |
| 42 | + hostname, _ := os.Hostname() |
| 43 | + |
| 44 | + switch *certType { |
| 45 | + case "client": |
| 46 | + if _, err := os.Stat(fmt.Sprintf("%s/%s.pem", *dir, *certName)); err == nil { |
| 47 | + if !*force { |
| 48 | + fmt.Println("File already exists exiting") |
| 49 | + os.Exit(0) |
| 50 | + } |
| 51 | + } |
| 52 | + jsonStr = fmt.Sprintf("{ \"profile\": \"%s\", \"request\": { \"CN\": \"%s\", \"hosts\": [\"\"], \"key\": { \"algo\": \"rsa\", \"size\": 2048 }, \"names\": [ { \"C\": \"US\", \"L\": \"San Antonio\", \"O\": \"test\", \"OU\": \"kumoru.org\", \"ST\": \"Texas\" } ] } } ", *certType, *certName) |
| 53 | + case "server", "client-server": |
| 54 | + if _, err := os.Stat(fmt.Sprintf("%s/%s.pem", *dir, hostname)); err == nil { |
| 55 | + if !*force { |
| 56 | + fmt.Println("File already exists exiting") |
| 57 | + os.Exit(0) |
| 58 | + } |
| 59 | + } |
| 60 | + jsonStr = fmt.Sprintf("{ \"profile\": \"%s\", \"request\": { \"CN\": \"%s\", \"hosts\": [\"%s\"], \"key\": { \"algo\": \"rsa\", \"size\": 2048 }, \"names\": [ { \"C\": \"US\", \"L\": \"San Antonio\", \"O\": \"test\", \"OU\": \"kumoru.org\", \"ST\": \"Texas\" } ] } } ", *certType, hostname, hostname) |
| 61 | + } |
| 62 | + |
| 63 | + tr := &http.Transport{ |
| 64 | + TLSClientConfig: &tls.Config{ |
| 65 | + MaxVersion: tls.VersionTLS11, |
| 66 | + InsecureSkipVerify: *verifySSL, |
| 67 | + }, |
| 68 | + } |
| 69 | + |
| 70 | + user := "" |
| 71 | + pass := "" |
| 72 | + |
| 73 | + if os.Getenv("CFSSL_USERNAME") != "" { |
| 74 | + user = os.Getenv("CFSSL_USERNAME") |
| 75 | + pass = os.Getenv("CFSSL_PASSWORD") |
| 76 | + } |
| 77 | + |
| 78 | + if *username != "" { |
| 79 | + user = *username |
| 80 | + pass = *password |
| 81 | + } |
| 82 | + |
| 83 | + if !strings.Contains("https", *url) { |
| 84 | + fmt.Println("Please provide an https url") |
| 85 | + os.Exit(1) |
| 86 | + } |
| 87 | + |
| 88 | + req, _ := http.NewRequest("POST", "https://ca.kumoru.org/api/v1/cfssl/newcert", |
| 89 | + bytes.NewBuffer([]byte(jsonStr))) // TODO: Replace host with variable |
| 90 | + |
| 91 | + if user != "" { |
| 92 | + req.SetBasicAuth(user, pass) |
| 93 | + } |
| 94 | + |
| 95 | + client := &http.Client{Transport: tr} |
| 96 | + resp, err := client.Do(req) |
| 97 | + if err != nil { |
| 98 | + fmt.Printf("%s\n", err) |
| 99 | + os.Exit(1) |
| 100 | + } |
| 101 | + body, _ := ioutil.ReadAll(resp.Body) |
| 102 | + defer resp.Body.Close() |
| 103 | + |
| 104 | + r := new(CfsslResponse) |
| 105 | + if err = json.Unmarshal(body, &r); err != nil { |
| 106 | + log.Fatal("Failed to generage CFSLL Certificate") |
| 107 | + } |
| 108 | + |
| 109 | + fmt.Printf("CFSSL response: %+v\n", r) |
| 110 | + |
| 111 | + if err := ioutil.WriteFile("/etc/certificates/client.pem", []byte(r.Result.Certificate), 0644); err != nil { |
| 112 | + return false |
| 113 | + } |
| 114 | + if err := ioutil.WriteFile("/etc/certificates/client-key.pem", []byte(r.Result.PrivateKey), 0644); err != nil { |
| 115 | + return false |
| 116 | + } |
| 117 | + |
| 118 | + if getCAcert() != nil { |
| 119 | + return false |
| 120 | + } |
| 121 | + |
| 122 | + return true |
| 123 | +} |
| 124 | + |
| 125 | +func getCAcert() error { |
| 126 | + caURL := "" |
| 127 | + |
| 128 | + if os.Getenv("CA_CERT_URL") != "" { |
| 129 | + caURL = os.Getenv("CA_CERT_URL") |
| 130 | + } |
| 131 | + |
| 132 | + if *caCertURL != "" { |
| 133 | + caURL = *caCertURL |
| 134 | + |
| 135 | + } |
| 136 | + |
| 137 | + if caURL == "" { |
| 138 | + return nil |
| 139 | + } |
| 140 | + |
| 141 | + resp, err := http.Get(os.Getenv("CA_CERT_URL")) // TODO: Replace host with variable |
| 142 | + if err != nil { |
| 143 | + panic(err.Error()) |
| 144 | + } |
| 145 | + body, _ := ioutil.ReadAll(resp.Body) |
| 146 | + defer resp.Body.Close() |
| 147 | + |
| 148 | + return ioutil.WriteFile("/etc/certificates/ca.pem", body, 0644) |
| 149 | + |
| 150 | +} |
| 151 | + |
| 152 | +// CfsslResponse struct |
| 153 | +type CfsslResponse struct { |
| 154 | + Success bool `json:"success"` |
| 155 | + Result struct { |
| 156 | + Certificate string `json:"certificate"` |
| 157 | + CertificateRequest string `json:"certificate_request"` |
| 158 | + PrivateKey string `json:"private_key"` |
| 159 | + Sums struct { |
| 160 | + Certificate struct { |
| 161 | + Md5 string `json:"md5"` |
| 162 | + Sha1 string `json:"sha-1"` |
| 163 | + } `json:"certificate"` |
| 164 | + CertificateRequest struct { |
| 165 | + Md5 string `json:"md5"` |
| 166 | + Sha1 string `json:"sha-1"` |
| 167 | + } `json:"certificate_request"` |
| 168 | + } `json:"sums"` |
| 169 | + } `json:"result"` |
| 170 | + Errors []interface{} `json:"errors"` |
| 171 | + Messages []interface{} `json:"messages"` |
| 172 | +} |
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