Mercurial > gemma

annotate pkg/middleware/modifyquery.go @ 467:73c7b2d6246e

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Used hex-encoded usernames and a stored procedure to decode them to impersonate with the metamorph user.
author Sascha L. Teichmann <sascha.teichmann@intevation.de>
date Wed, 22 Aug 2018 17:43:30 +0200
parents ffdb507d5b42
children 1b08432a0e5d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
419
6627c48363a0 First attempt for user injection of proxy for using GeoServer with role based security.
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1 package middleware
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2
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3 import (
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4 "encoding/hex"
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5 "log"
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6 "net/http"
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7 "net/url"
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8 "strings"
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9
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10 "gemma.intevation.de/gemma/pkg/auth"
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11 )
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12
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13 // ParseQuery is a modified version of the internal query
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14 // parser of the url.parseQuery of the standard library.
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15 func ParseQuery(
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16 m url.Values,
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17 query string,
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18 keySep, valueSep string,
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19 unescape func(string) (string, error),
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20 ) error {
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21 if unescape == nil {
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22 unescape = url.QueryUnescape
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23 }
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24 for query != "" {
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25 key := query
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26 if i := strings.Index(key, keySep); i >= 0 {
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27 key, query = key[:i], key[i+1:]
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28
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29 } else {
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30 query = ""
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31 }
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32 if key == "" {
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33 continue
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34 }
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35 value := ""
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36 if i := strings.Index(key, valueSep); i >= 0 {
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37 key, value = key[:i], key[i+1:]
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38 }
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39 key, err := unescape(key)
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40 if err != nil {
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41 return err
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42 }
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43 value, err = unescape(value)
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44 if err != nil {
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45 return err
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46 }
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47 m[key] = append(m[key], value)
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48 }
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49 return nil
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50 }
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51
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52 func ModifyQuery(next http.Handler, modify func(*http.Request, url.Values) error) http.Handler {
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53
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54 return http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
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55
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56 // GeoServer query parameters contain ';' as sub key separators.
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57 // If we would use req.URL.Query() this would be split
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58 // at the wrong level resulting in broken key/value pairs.
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59 // So we do the splitting ourselves.
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60
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61 parameters := make(url.Values)
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62
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63 if err := ParseQuery(parameters, req.URL.RawQuery, "&", "=", nil); err != nil {
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64 log.Printf("parsing query failed: %v\n", err)
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65 http.Error(rw, http.StatusText(http.StatusBadRequest), http.StatusBadRequest)
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66 return
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67 }
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68
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69 if err := modify(req, parameters); err != nil {
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70 log.Printf("modifying query parameters failed: %v\n", err)
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71 http.Error(rw, http.StatusText(http.StatusBadRequest), http.StatusBadRequest)
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72 }
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73
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74 req.URL.RawQuery = parameters.Encode()
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75
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76 next.ServeHTTP(rw, req)
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77 })
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78 }
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79
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80 func InjectUser(req *http.Request, parameters url.Values) error {
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81 // To prevent SQL injections
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82 parameters.Del("env")
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83
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84 session, ok := auth.GetSession(req)
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85 if ok {
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86 log.Printf("Injecting user %s\n", session.User)
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87 parameters.Set("env", "user:"+hex.EncodeToString([]byte(session.User)))
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88 }
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89 return nil
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90 }