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Improve pty handling; Add sentry support; Kill zombies; Proper exit-status
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,138 @@ | ||
| /* | ||
| Copyright 2017 Resin.io | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
|
|
||
| package main | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "crypto/md5" | ||
| "crypto/subtle" | ||
| "errors" | ||
| "fmt" | ||
| "strings" | ||
| "text/template" | ||
|
|
||
| "github.com/resin-io/pinejs-client-go" | ||
| "golang.org/x/crypto/ssh" | ||
| ) | ||
|
|
||
| type authHandler struct { | ||
| baseURL, apiKey string | ||
| template string | ||
| rejectedSessions map[string]int | ||
| } | ||
|
|
||
| func newAuthHandler(baseURL, apiKey string) authHandler { | ||
| return authHandler{ | ||
| baseURL: baseURL, | ||
| apiKey: apiKey, | ||
| template: "", | ||
| rejectedSessions: map[string]int{}, | ||
| } | ||
| } | ||
|
|
||
| func (a *authHandler) getUserKeys(username string) ([]ssh.PublicKey, error) { | ||
| url := fmt.Sprintf("%s/%s", a.baseURL, "v1") | ||
| client := pinejs.NewClient(url, a.apiKey) | ||
|
|
||
| users := make([]map[string]interface{}, 1) | ||
| users[0] = make(map[string]interface{}) | ||
| users[0]["pinejs"] = "user__has__public_key" | ||
|
|
||
| filter := pinejs.QueryOption{ | ||
| Type: pinejs.Filter, | ||
| Content: []string{fmt.Sprintf("user/any(u:((tolower(u/username)) eq ('%s')))", | ||
| strings.ToLower(username))}, | ||
| Raw: true} | ||
| fields := pinejs.QueryOption{ | ||
| Type: pinejs.Select, | ||
| Content: []string{"user", "public_key"}, | ||
| } | ||
| if err := client.List(&users, filter, fields); err != nil { | ||
| return nil, err | ||
| } else if len(users) == 0 { | ||
| return nil, errors.New("Invalid User") | ||
| } | ||
|
|
||
| keys := make([]ssh.PublicKey, 0) | ||
| for _, user := range users { | ||
| if key, _, _, _, err := ssh.ParseAuthorizedKey([]byte(user["public_key"].(string))); err == nil { | ||
| keys = append(keys, key) | ||
| } | ||
| } | ||
|
|
||
| return keys, nil | ||
| } | ||
|
|
||
| func (a *authHandler) publicKeyCallback(meta ssh.ConnMetadata, key ssh.PublicKey) (*ssh.Permissions, error) { | ||
| keys, err := a.getUserKeys(meta.User()) | ||
| if err != nil { | ||
| return nil, errors.New("Unauthorised") | ||
| } | ||
|
|
||
| for _, k := range keys { | ||
| if subtle.ConstantTimeCompare(k.Marshal(), key.Marshal()) == 1 { | ||
| return nil, nil | ||
| } | ||
| } | ||
|
|
||
| return nil, errors.New("Unauthorised") | ||
| } | ||
|
|
||
| func (a *authHandler) keyboardInteractiveCallback(meta ssh.ConnMetadata, client ssh.KeyboardInteractiveChallenge) (*ssh.Permissions, error) { | ||
| // check if this session has already been rejected, only send the banner once | ||
| sessionKey := string(meta.SessionID()) | ||
| if _, ok := a.rejectedSessions[sessionKey]; ok { | ||
| // this operates on the assumption that `keyboard-interactive` will be attempted three times | ||
| // and then cleans up the state | ||
| a.rejectedSessions[sessionKey]++ | ||
| if a.rejectedSessions[sessionKey] == 3 { | ||
| delete(a.rejectedSessions, sessionKey) | ||
| } | ||
| return nil, errors.New("Unauthorised") | ||
| } | ||
| a.rejectedSessions[sessionKey] = 1 | ||
|
|
||
| // fetch user's keys... | ||
| keys, err := a.getUserKeys(meta.User()) | ||
| if err != nil { | ||
| return nil, errors.New("Unauthorised") | ||
| } | ||
| // ...and generate their fingerprints | ||
| fingerprints := make([]string, 0) | ||
| for _, key := range keys { | ||
| hash := md5.New() | ||
| if _, err := hash.Write(key.Marshal()); err != nil { | ||
| return nil, err | ||
| } | ||
| fingerprint := fmt.Sprintf("%x", hash.Sum(nil)) | ||
| fingerprints = append(fingerprints, fingerprint) | ||
| } | ||
|
|
||
| tmpl := template.Must(template.New("auth_failed_template").Parse(a.template)) | ||
| msg := bytes.NewBuffer(nil) | ||
| // pass `user` and `fingerprints` vars to template and render | ||
| if err := tmpl.Execute(msg, map[string]interface{}{"user": meta.User(), "fingerprints": fingerprints}); err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| // send the rendered template as an auth challenge with no questions | ||
| if _, err := client(meta.User(), msg.String(), nil, nil); err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return nil, errors.New("Unauthorised") | ||
| } |
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