mirror of
https://gogs.blitter.com/RLabs/xs
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106 lines
2.3 KiB
Go
106 lines
2.3 KiB
Go
// Authentication routines for the HKExSh
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//
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// Copyright (c) 2017-2018 Russell Magee
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// Licensed under the terms of the MIT license (see LICENSE.mit in this
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// distribution)
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//
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// golang implementation by Russ Magee (rmagee_at_gmail.com)
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package hkexsh
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import (
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"bytes"
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"encoding/csv"
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"fmt"
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"io"
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"io/ioutil"
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"log"
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"os/user"
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"runtime"
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"strings"
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"github.com/jameskeane/bcrypt"
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)
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func AuthUserByPasswd(username string, auth string, fname string) (valid bool, allowedCmds string) {
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b, e := ioutil.ReadFile(fname)
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if e != nil {
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valid = false
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log.Println("ERROR: Cannot read hkexsh.passwd file!")
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log.Fatal(e)
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}
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r := csv.NewReader(bytes.NewReader(b))
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r.Comma = ':'
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r.Comment = '#'
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r.FieldsPerRecord = 3 // username:salt:authCookie [TODO:disallowedCmdList (a,b,...)]
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for {
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record, err := r.Read()
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if err == io.EOF {
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// Use dummy entry if user not found
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// (prevent user enumeration attack via obvious timing diff;
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// ie., not attempting any auth at all)
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record = []string{"$nosuchuser$",
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"$2a$12$l0coBlRDNEJeQVl6GdEPbU",
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"$2a$12$l0coBlRDNEJeQVl6GdEPbUC/xmuOANvqgmrMVum6S4i.EXPgnTXy6"}
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username = "$nosuchuser$"
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err = nil
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}
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if err != nil {
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log.Fatal(err)
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}
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if username == record[0] {
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tmp, _ := bcrypt.Hash(auth, record[1])
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if tmp == record[2] && username != "$nosuchuser$" {
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valid = true
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}
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break
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}
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}
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// Security scrub
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for i := range b {
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b[i] = 0
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}
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b = nil
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r = nil
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runtime.GC()
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return
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}
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func AuthUserByToken(username string, connhostname string, auth string) (valid bool) {
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auth = strings.TrimSpace(auth)
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u, ue := user.Lookup(username)
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if ue != nil {
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return false
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}
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b, e := ioutil.ReadFile(fmt.Sprintf("%s/.hkexsh_id", u.HomeDir))
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if e != nil {
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log.Printf("INFO: Cannot read %s/.hkexsh_id\n", u.HomeDir)
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return false
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}
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r := csv.NewReader(bytes.NewReader(b))
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r.Comma = ':'
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r.Comment = '#'
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r.FieldsPerRecord = 2 // connhost:authtoken
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for {
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record, err := r.Read()
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if err == io.EOF {
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return false
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}
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record[0] = strings.TrimSpace(record[0])
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record[1] = strings.TrimSpace(record[1])
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//fmt.Println("auth:", auth, "record:",
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// strings.Join([]string{record[0], record[1]}, ":"))
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if (connhostname == record[0]) &&
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(auth == strings.Join([]string{record[0], record[1]}, ":")) {
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return true
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}
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}
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return
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}
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