Sergiusz Bazanski | b13b7ff | 2019-08-29 20:12:24 +0200 | [diff] [blame] | 1 | package main |
| 2 | |
| 3 | import ( |
Serge Bazanski | 0754ed8 | 2020-11-27 09:42:59 +0000 | [diff] [blame] | 4 | "context" |
Sergiusz Bazanski | b13b7ff | 2019-08-29 20:12:24 +0200 | [diff] [blame] | 5 | "encoding/pem" |
| 6 | "fmt" |
| 7 | "time" |
| 8 | |
| 9 | "github.com/golang/glog" |
| 10 | corev1 "k8s.io/api/core/v1" |
| 11 | rbacv1 "k8s.io/api/rbac/v1" |
| 12 | "k8s.io/apimachinery/pkg/api/errors" |
| 13 | metav1 "k8s.io/apimachinery/pkg/apis/meta/v1" |
| 14 | "k8s.io/client-go/kubernetes" |
| 15 | "k8s.io/client-go/rest" |
| 16 | |
| 17 | pb "code.hackerspace.pl/hscloud/cluster/prodvider/proto" |
| 18 | ) |
| 19 | |
| 20 | func (p *prodvider) kubernetesCreds(username string) (*pb.KubernetesKeys, error) { |
| 21 | o := fmt.Sprintf("sso:%s", username) |
| 22 | |
| 23 | csrPEM, keyPEM, err := p.makeKubernetesCSR(username+"@hackerspace.pl", o) |
| 24 | if err != nil { |
| 25 | return nil, err |
| 26 | } |
| 27 | |
| 28 | certPEM, err := p.makeKubernetesCertificate(csrPEM, time.Now().Add(13*time.Hour)) |
| 29 | if err != nil { |
| 30 | return nil, err |
| 31 | } |
| 32 | |
| 33 | caCert, _ := p.sign.Certificate("", "") |
| 34 | caPEM := pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: caCert.Raw}) |
| 35 | |
| 36 | // Build certificate chain from new cert and intermediate CA. |
| 37 | chainPEM := append(certPEM, caPEM...) |
| 38 | |
| 39 | glog.Infof("Generated k8s certificate for %q", username) |
| 40 | return &pb.KubernetesKeys{ |
| 41 | Cluster: "k0.hswaw.net", |
| 42 | // APIServerCA |
| 43 | Ca: p.kubeCAPEM, |
| 44 | // Chain of new cert + intermediate CA |
| 45 | Cert: chainPEM, |
| 46 | Key: keyPEM, |
| 47 | }, nil |
| 48 | } |
| 49 | |
| 50 | func (p *prodvider) kubernetesConnect() error { |
| 51 | csrPEM, keyPEM, err := p.makeKubernetesCSR("prodvider", "system:masters") |
| 52 | if err != nil { |
| 53 | return err |
| 54 | } |
| 55 | |
| 56 | certPEM, err := p.makeKubernetesCertificate(csrPEM, time.Now().Add(30*24*time.Hour)) |
| 57 | if err != nil { |
| 58 | return err |
| 59 | } |
| 60 | |
| 61 | caCert, _ := p.sign.Certificate("", "") |
| 62 | |
| 63 | caPEM := pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: caCert.Raw}) |
| 64 | |
| 65 | glog.Infof("Generated k8s certificate for self (system:masters)") |
| 66 | |
| 67 | // Build certificate chain from our cert and intermediate CA. |
| 68 | chainPEM := append(certPEM, caPEM...) |
| 69 | |
| 70 | config := &rest.Config{ |
| 71 | Host: flagKubernetesHost, |
| 72 | TLSClientConfig: rest.TLSClientConfig{ |
| 73 | // Chain to authenticate ourselves (us + intermediate CA). |
| 74 | CertData: chainPEM, |
| 75 | KeyData: keyPEM, |
| 76 | // APIServer CA for verification. |
| 77 | CAData: p.kubeCAPEM, |
| 78 | }, |
| 79 | } |
| 80 | |
| 81 | cs, err := kubernetes.NewForConfig(config) |
| 82 | if err != nil { |
| 83 | return err |
| 84 | } |
| 85 | |
| 86 | p.k8s = cs |
| 87 | |
| 88 | return nil |
| 89 | } |
| 90 | |
| 91 | // kubernetesSetupUser ensures that for a given SSO username we: |
| 92 | // - have a personal-<username> namespace |
| 93 | // - have a sso:<username>:personal rolebinding that binds |
| 94 | // system:admin-namespace to the user within their personal namespace |
| 95 | // - have a sso:<username>:global clusterrolebinding that binds |
| 96 | // system:viewer to the user at cluster level |
Serge Bazanski | 0754ed8 | 2020-11-27 09:42:59 +0000 | [diff] [blame] | 97 | func (p *prodvider) kubernetesSetupUser(ctx context.Context, username string) error { |
Sergiusz Bazanski | b13b7ff | 2019-08-29 20:12:24 +0200 | [diff] [blame] | 98 | namespace := "personal-" + username |
Serge Bazanski | 0754ed8 | 2020-11-27 09:42:59 +0000 | [diff] [blame] | 99 | if err := p.ensureNamespace(ctx, namespace); err != nil { |
Sergiusz Bazanski | b13b7ff | 2019-08-29 20:12:24 +0200 | [diff] [blame] | 100 | return err |
| 101 | } |
Serge Bazanski | 0754ed8 | 2020-11-27 09:42:59 +0000 | [diff] [blame] | 102 | if err := p.ensureRoleBindingPersonal(ctx, namespace, username); err != nil { |
Sergiusz Bazanski | b13b7ff | 2019-08-29 20:12:24 +0200 | [diff] [blame] | 103 | return err |
| 104 | } |
Serge Bazanski | 0754ed8 | 2020-11-27 09:42:59 +0000 | [diff] [blame] | 105 | if err := p.ensureClusterRoleBindingGlobal(ctx, username); err != nil { |
Sergiusz Bazanski | b13b7ff | 2019-08-29 20:12:24 +0200 | [diff] [blame] | 106 | return err |
| 107 | } |
| 108 | |
| 109 | return nil |
| 110 | } |
| 111 | |
Serge Bazanski | 0754ed8 | 2020-11-27 09:42:59 +0000 | [diff] [blame] | 112 | func (p *prodvider) ensureNamespace(ctx context.Context, name string) error { |
| 113 | _, err := p.k8s.CoreV1().Namespaces().Get(ctx, name, metav1.GetOptions{}) |
Sergiusz Bazanski | b13b7ff | 2019-08-29 20:12:24 +0200 | [diff] [blame] | 114 | switch { |
| 115 | case err == nil: |
| 116 | // Already exists, nothing to do |
| 117 | return nil |
| 118 | case errors.IsNotFound(err): |
| 119 | break |
| 120 | default: |
| 121 | // Something went wrong. |
| 122 | return err |
| 123 | } |
| 124 | ns := &corev1.Namespace{ |
| 125 | ObjectMeta: metav1.ObjectMeta{ |
| 126 | Name: name, |
| 127 | }, |
| 128 | } |
Serge Bazanski | 0754ed8 | 2020-11-27 09:42:59 +0000 | [diff] [blame] | 129 | _, err = p.k8s.CoreV1().Namespaces().Create(ctx, ns, metav1.CreateOptions{}) |
Sergiusz Bazanski | b13b7ff | 2019-08-29 20:12:24 +0200 | [diff] [blame] | 130 | return err |
| 131 | } |
| 132 | |
Serge Bazanski | 0754ed8 | 2020-11-27 09:42:59 +0000 | [diff] [blame] | 133 | func (p *prodvider) ensureRoleBindingPersonal(ctx context.Context, namespace, username string) error { |
Sergiusz Bazanski | b13b7ff | 2019-08-29 20:12:24 +0200 | [diff] [blame] | 134 | name := "sso:" + username + ":personal" |
| 135 | rb := &rbacv1.RoleBinding{ |
| 136 | ObjectMeta: metav1.ObjectMeta{ |
| 137 | Name: name, |
| 138 | Namespace: namespace, |
| 139 | }, |
| 140 | Subjects: []rbacv1.Subject{ |
| 141 | { |
| 142 | APIGroup: "rbac.authorization.k8s.io", |
| 143 | Kind: "User", |
| 144 | Name: username + "@hackerspace.pl", |
| 145 | }, |
| 146 | }, |
| 147 | RoleRef: rbacv1.RoleRef{ |
| 148 | APIGroup: "rbac.authorization.k8s.io", |
| 149 | Kind: "ClusterRole", |
| 150 | Name: "system:admin-namespace", |
| 151 | }, |
| 152 | } |
| 153 | |
| 154 | rbs := p.k8s.RbacV1().RoleBindings(namespace) |
Serge Bazanski | 0754ed8 | 2020-11-27 09:42:59 +0000 | [diff] [blame] | 155 | _, err := rbs.Get(ctx, name, metav1.GetOptions{}) |
Sergiusz Bazanski | b13b7ff | 2019-08-29 20:12:24 +0200 | [diff] [blame] | 156 | switch { |
| 157 | case err == nil: |
| 158 | // Already exists, update. |
Serge Bazanski | 0754ed8 | 2020-11-27 09:42:59 +0000 | [diff] [blame] | 159 | _, err = rbs.Update(ctx, rb, metav1.UpdateOptions{}) |
Sergiusz Bazanski | b13b7ff | 2019-08-29 20:12:24 +0200 | [diff] [blame] | 160 | return err |
| 161 | case errors.IsNotFound(err): |
| 162 | // Create. |
Serge Bazanski | 0754ed8 | 2020-11-27 09:42:59 +0000 | [diff] [blame] | 163 | _, err = rbs.Create(ctx, rb, metav1.CreateOptions{}) |
Sergiusz Bazanski | b13b7ff | 2019-08-29 20:12:24 +0200 | [diff] [blame] | 164 | return err |
| 165 | default: |
| 166 | // Something went wrong. |
| 167 | return err |
| 168 | } |
| 169 | } |
| 170 | |
Serge Bazanski | 0754ed8 | 2020-11-27 09:42:59 +0000 | [diff] [blame] | 171 | func (p *prodvider) ensureClusterRoleBindingGlobal(ctx context.Context, username string) error { |
Sergiusz Bazanski | b13b7ff | 2019-08-29 20:12:24 +0200 | [diff] [blame] | 172 | name := "sso:" + username + ":global" |
| 173 | rb := &rbacv1.ClusterRoleBinding{ |
| 174 | ObjectMeta: metav1.ObjectMeta{ |
| 175 | Name: name, |
| 176 | }, |
| 177 | Subjects: []rbacv1.Subject{ |
| 178 | { |
| 179 | APIGroup: "rbac.authorization.k8s.io", |
| 180 | Kind: "User", |
| 181 | Name: username + "@hackerspace.pl", |
| 182 | }, |
| 183 | }, |
| 184 | RoleRef: rbacv1.RoleRef{ |
| 185 | APIGroup: "rbac.authorization.k8s.io", |
| 186 | Kind: "ClusterRole", |
| 187 | Name: "system:viewer", |
| 188 | }, |
| 189 | } |
| 190 | |
| 191 | crbs := p.k8s.RbacV1().ClusterRoleBindings() |
Serge Bazanski | 0754ed8 | 2020-11-27 09:42:59 +0000 | [diff] [blame] | 192 | _, err := crbs.Get(ctx, name, metav1.GetOptions{}) |
Sergiusz Bazanski | b13b7ff | 2019-08-29 20:12:24 +0200 | [diff] [blame] | 193 | switch { |
| 194 | case err == nil: |
| 195 | // Already exists, update. |
Serge Bazanski | 0754ed8 | 2020-11-27 09:42:59 +0000 | [diff] [blame] | 196 | _, err = crbs.Update(ctx, rb, metav1.UpdateOptions{}) |
Sergiusz Bazanski | b13b7ff | 2019-08-29 20:12:24 +0200 | [diff] [blame] | 197 | return err |
| 198 | case errors.IsNotFound(err): |
| 199 | // Create. |
Serge Bazanski | 0754ed8 | 2020-11-27 09:42:59 +0000 | [diff] [blame] | 200 | _, err = crbs.Create(ctx, rb, metav1.CreateOptions{}) |
Sergiusz Bazanski | b13b7ff | 2019-08-29 20:12:24 +0200 | [diff] [blame] | 201 | return err |
| 202 | default: |
| 203 | // Something went wrong. |
| 204 | return err |
| 205 | } |
| 206 | } |