Ability to remove hosts from the states, refactoring

[tofuproxy.git] / httpauth.go

diff --git a/httpauth.go b/httpauth.go
new file mode 100644 (file)
index 0000000..5e97636
--- /dev/null
+++ b/httpauth.go
@@ -0,0 +1,98 @@
+/*
+tofuproxy -- HTTP proxy with TLS certificates management
+Copyright (C) 2021 Sergey Matveev <stargrave@stargrave.org>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, version 3 of the License.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package tofuproxy
+
+import (
+       "bytes"
+       "errors"
+       "fmt"
+       "io/ioutil"
+       "log"
+       "os"
+       "os/exec"
+       "path/filepath"
+       "strings"
+)
+
+func findInNetrc(host string) (string, string) {
+       netrcPath, ok := os.LookupEnv("NETRC")
+       if !ok {
+               netrcPath = filepath.Join(os.Getenv("HOME"), ".netrc")
+       }
+       data, err := ioutil.ReadFile(netrcPath)
+       if err != nil {
+               if os.IsNotExist(err) {
+                       return "", ""
+               }
+               log.Fatalln(err)
+       }
+       var login string
+       var password string
+       for _, line := range strings.Split(string(data), "\n") {
+               if i := strings.Index(line, "#"); i >= 0 {
+                       line = line[:i]
+               }
+               f := strings.Fields(line)
+               if len(f) >= 6 &&
+                       f[0] == "machine" && f[1] == host &&
+                       f[2] == "login" && f[4] == "password" {
+                       login, password = f[3], f[5]
+                       break
+               }
+       }
+       return login, password
+}
+
+func authDialog(host, realm string) (string, string, error) {
+       var b bytes.Buffer
+       userInit, passInit := findInNetrc(host)
+       b.WriteString(fmt.Sprintf(`
+wm title . "Unauthorized: %s"
+
+label .luser -text "User"
+set userinit "%s"
+set u [entry .user -textvariable userinit]
+grid .luser .user
+
+label .lpass -text "Password"
+set passinit "%s"
+set p [entry .pass -show "*" -textvariable passinit]
+grid .lpass .pass
+
+proc submit {} {
+    global u p
+    puts [$u get]
+    puts [$p get]
+    exit
+}
+
+button .submit -text "Submit" -command submit
+grid .submit
+`, realm, userInit, passInit))
+       cmd := exec.Command(CmdWish)
+       cmd.Stdin = &b
+       out, err := cmd.Output()
+       if err != nil {
+               return "", "", err
+       }
+       lines := strings.Split(string(out), "\n")
+       if len(lines) < 2 {
+               return "", "", errors.New("invalid output from authorization form")
+       }
+       return lines[0], lines[1], nil
+}