Sergiusz Bazanski | b13b7ff | 2019-08-29 20:12:24 +0200 | [diff] [blame] | 1 | package main |
| 2 | |
| 3 | import ( |
| 4 | "encoding/pem" |
| 5 | "fmt" |
| 6 | "time" |
| 7 | |
| 8 | "github.com/golang/glog" |
| 9 | corev1 "k8s.io/api/core/v1" |
| 10 | rbacv1 "k8s.io/api/rbac/v1" |
| 11 | "k8s.io/apimachinery/pkg/api/errors" |
| 12 | metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" |
| 13 | "k8s.io/client-go/kubernetes" |
| 14 | "k8s.io/client-go/rest" |
| 15 | |
| 16 | pb "code.hackerspace.pl/hscloud/cluster/prodvider/proto" |
| 17 | ) |
| 18 | |
| 19 | func (p *prodvider) kubernetesCreds(username string) (*pb.KubernetesKeys, error) { |
| 20 | o := fmt.Sprintf("sso:%s", username) |
| 21 | |
| 22 | csrPEM, keyPEM, err := p.makeKubernetesCSR(username+"@hackerspace.pl", o) |
| 23 | if err != nil { |
| 24 | return nil, err |
| 25 | } |
| 26 | |
| 27 | certPEM, err := p.makeKubernetesCertificate(csrPEM, time.Now().Add(13*time.Hour)) |
| 28 | if err != nil { |
| 29 | return nil, err |
| 30 | } |
| 31 | |
| 32 | caCert, _ := p.sign.Certificate("", "") |
| 33 | caPEM := pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: caCert.Raw}) |
| 34 | |
| 35 | // Build certificate chain from new cert and intermediate CA. |
| 36 | chainPEM := append(certPEM, caPEM...) |
| 37 | |
| 38 | glog.Infof("Generated k8s certificate for %q", username) |
| 39 | return &pb.KubernetesKeys{ |
| 40 | Cluster: "k0.hswaw.net", |
| 41 | // APIServerCA |
| 42 | Ca: p.kubeCAPEM, |
| 43 | // Chain of new cert + intermediate CA |
| 44 | Cert: chainPEM, |
| 45 | Key: keyPEM, |
| 46 | }, nil |
| 47 | } |
| 48 | |
| 49 | func (p *prodvider) kubernetesConnect() error { |
| 50 | csrPEM, keyPEM, err := p.makeKubernetesCSR("prodvider", "system:masters") |
| 51 | if err != nil { |
| 52 | return err |
| 53 | } |
| 54 | |
| 55 | certPEM, err := p.makeKubernetesCertificate(csrPEM, time.Now().Add(30*24*time.Hour)) |
| 56 | if err != nil { |
| 57 | return err |
| 58 | } |
| 59 | |
| 60 | caCert, _ := p.sign.Certificate("", "") |
| 61 | |
| 62 | caPEM := pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: caCert.Raw}) |
| 63 | |
| 64 | glog.Infof("Generated k8s certificate for self (system:masters)") |
| 65 | |
| 66 | // Build certificate chain from our cert and intermediate CA. |
| 67 | chainPEM := append(certPEM, caPEM...) |
| 68 | |
| 69 | config := &rest.Config{ |
| 70 | Host: flagKubernetesHost, |
| 71 | TLSClientConfig: rest.TLSClientConfig{ |
| 72 | // Chain to authenticate ourselves (us + intermediate CA). |
| 73 | CertData: chainPEM, |
| 74 | KeyData: keyPEM, |
| 75 | // APIServer CA for verification. |
| 76 | CAData: p.kubeCAPEM, |
| 77 | }, |
| 78 | } |
| 79 | |
| 80 | cs, err := kubernetes.NewForConfig(config) |
| 81 | if err != nil { |
| 82 | return err |
| 83 | } |
| 84 | |
| 85 | p.k8s = cs |
| 86 | |
| 87 | return nil |
| 88 | } |
| 89 | |
| 90 | // kubernetesSetupUser ensures that for a given SSO username we: |
| 91 | // - have a personal-<username> namespace |
| 92 | // - have a sso:<username>:personal rolebinding that binds |
| 93 | // system:admin-namespace to the user within their personal namespace |
| 94 | // - have a sso:<username>:global clusterrolebinding that binds |
| 95 | // system:viewer to the user at cluster level |
| 96 | func (p *prodvider) kubernetesSetupUser(username string) error { |
| 97 | namespace := "personal-" + username |
| 98 | if err := p.ensureNamespace(namespace); err != nil { |
| 99 | return err |
| 100 | } |
| 101 | if err := p.ensureRoleBindingPersonal(namespace, username); err != nil { |
| 102 | return err |
| 103 | } |
| 104 | if err := p.ensureClusterRoleBindingGlobal(username); err != nil { |
| 105 | return err |
| 106 | } |
| 107 | |
| 108 | return nil |
| 109 | } |
| 110 | |
| 111 | func (p *prodvider) ensureNamespace(name string) error { |
| 112 | _, err := p.k8s.CoreV1().Namespaces().Get(name, metav1.GetOptions{}) |
| 113 | switch { |
| 114 | case err == nil: |
| 115 | // Already exists, nothing to do |
| 116 | return nil |
| 117 | case errors.IsNotFound(err): |
| 118 | break |
| 119 | default: |
| 120 | // Something went wrong. |
| 121 | return err |
| 122 | } |
| 123 | ns := &corev1.Namespace{ |
| 124 | ObjectMeta: metav1.ObjectMeta{ |
| 125 | Name: name, |
| 126 | }, |
| 127 | } |
| 128 | _, err = p.k8s.CoreV1().Namespaces().Create(ns) |
| 129 | return err |
| 130 | } |
| 131 | |
| 132 | func (p *prodvider) ensureRoleBindingPersonal(namespace, username string) error { |
| 133 | name := "sso:" + username + ":personal" |
| 134 | rb := &rbacv1.RoleBinding{ |
| 135 | ObjectMeta: metav1.ObjectMeta{ |
| 136 | Name: name, |
| 137 | Namespace: namespace, |
| 138 | }, |
| 139 | Subjects: []rbacv1.Subject{ |
| 140 | { |
| 141 | APIGroup: "rbac.authorization.k8s.io", |
| 142 | Kind: "User", |
| 143 | Name: username + "@hackerspace.pl", |
| 144 | }, |
| 145 | }, |
| 146 | RoleRef: rbacv1.RoleRef{ |
| 147 | APIGroup: "rbac.authorization.k8s.io", |
| 148 | Kind: "ClusterRole", |
| 149 | Name: "system:admin-namespace", |
| 150 | }, |
| 151 | } |
| 152 | |
| 153 | rbs := p.k8s.RbacV1().RoleBindings(namespace) |
| 154 | _, err := rbs.Get(name, metav1.GetOptions{}) |
| 155 | switch { |
| 156 | case err == nil: |
| 157 | // Already exists, update. |
| 158 | _, err = rbs.Update(rb) |
| 159 | return err |
| 160 | case errors.IsNotFound(err): |
| 161 | // Create. |
| 162 | _, err = rbs.Create(rb) |
| 163 | return err |
| 164 | default: |
| 165 | // Something went wrong. |
| 166 | return err |
| 167 | } |
| 168 | } |
| 169 | |
| 170 | func (p *prodvider) ensureClusterRoleBindingGlobal(username string) error { |
| 171 | name := "sso:" + username + ":global" |
| 172 | rb := &rbacv1.ClusterRoleBinding{ |
| 173 | ObjectMeta: metav1.ObjectMeta{ |
| 174 | Name: name, |
| 175 | }, |
| 176 | Subjects: []rbacv1.Subject{ |
| 177 | { |
| 178 | APIGroup: "rbac.authorization.k8s.io", |
| 179 | Kind: "User", |
| 180 | Name: username + "@hackerspace.pl", |
| 181 | }, |
| 182 | }, |
| 183 | RoleRef: rbacv1.RoleRef{ |
| 184 | APIGroup: "rbac.authorization.k8s.io", |
| 185 | Kind: "ClusterRole", |
| 186 | Name: "system:viewer", |
| 187 | }, |
| 188 | } |
| 189 | |
| 190 | crbs := p.k8s.RbacV1().ClusterRoleBindings() |
| 191 | _, err := crbs.Get(name, metav1.GetOptions{}) |
| 192 | switch { |
| 193 | case err == nil: |
| 194 | // Already exists, update. |
| 195 | _, err = crbs.Update(rb) |
| 196 | return err |
| 197 | case errors.IsNotFound(err): |
| 198 | // Create. |
| 199 | _, err = crbs.Create(rb) |
| 200 | return err |
| 201 | default: |
| 202 | // Something went wrong. |
| 203 | return err |
| 204 | } |
| 205 | } |