src/auth/digest/eDirectory/digest_pw_auth.cc

   1 /*
   2  * Copyright (C) 1996-2020 The Squid Software Foundation and contributors
   3  *
   4  * Squid software is distributed under GPLv2+ license and includes
   5  * contributions from numerous individuals and organizations.
   6  * Please see the COPYING and CONTRIBUTORS files for details.
   7  */
   8
   9 /*
  10  * AUTHOR: Robert Collins. Based on ncsa_auth.c by Arjan de Vet
  11  * <Arjan.deVet@adv.iae.nl>
  12  * LDAP backend extension by Flavio Pescuma, MARA Systems AB <flavio@marasystems.com>
  13  *
  14  * Example digest authentication program for Squid, based on the original
  15  * proxy_auth code from client_side.c, written by
  16  * Jon Thackray <jrmt@uk.gdscorp.com>.
  17  *
  18  * - comment lines are possible and should start with a '#';
  19  * - empty or blank lines are possible;
  20  * - file format is username:password
  21  *
  22  * To build a directory integrated backend, you need to be able to
  23  * calculate the HA1 returned to squid. To avoid storing a plaintext
  24  * password you can calculate MD5(username:realm:password) when the
  25  * user changes their password, and store the tuple username:realm:HA1.
  26  * then find the matching username:realm when squid asks for the
  27  * HA1.
  28  *
  29  * This implementation could be improved by using such a triple for
  30  * the file format.  However storing such a triple does little to
  31  * improve security: If compromised the username:realm:HA1 combination
  32  * is "plaintext equivalent" - for the purposes of digest authentication
  33  * they allow the user access. Password synchronization is not tackled
  34  * by digest - just preventing on the wire compromise.
  35  *
  36  * Copyright (c) 2003  Robert Collins  <robertc@squid-cache.org>
  37  */
  38 #include "squid.h"
  39 #include "auth/digest/eDirectory/digest_common.h"
  40 #include "auth/digest/eDirectory/ldap_backend.h"
  41 #include "helper/protocol_defines.h"
  42
  43 #define PROGRAM_NAME "digest_edirectory_auth"
  44
  45 static void
  46 GetHHA1(RequestData * requestData)
  47 {
  48     LDAPHHA1(requestData);
  49 }
  50
  51 static void
  52 ParseBuffer(char *buf, RequestData * requestData)
  53 {
  54     char *p;
  55     requestData->parsed = 0;
  56     if ((p = strchr(buf, '\n')) != NULL)
  57         *p = '\0';      /* strip \n */
  58
  59     p = NULL;
  60     requestData->channelId = strtoll(buf, &p, 10);
  61     if (*p != ' ') // not a channel-ID
  62         requestData->channelId = -1;
  63     else
  64         buf = ++p;
  65
  66     if ((requestData->user = strtok(buf, "\"")) == NULL)
  67         return;
  68     if ((requestData->realm = strtok(NULL, "\"")) == NULL)
  69         return;
  70     if ((requestData->realm = strtok(NULL, "\"")) == NULL)
  71         return;
  72     requestData->parsed = -1;
  73 }
  74
  75 static void
  76 OutputHHA1(RequestData * requestData)
  77 {
  78     requestData->error = 0;
  79     GetHHA1(requestData);
  80     if (requestData->channelId >= 0)
  81         printf("%u ", requestData->channelId);
  82     if (requestData->error) {
  83         SEND_ERR("message=\"No such user\"");
  84         return;
  85     }
  86     printf("OK ha1=\"%s\"\n", requestData->HHA1);
  87 }
  88
  89 static void
  90 DoOneRequest(char *buf)
  91 {
  92     RequestData requestData;
  93     ParseBuffer(buf, &requestData);
  94     if (!requestData.parsed) {
  95         if (requestData.channelId >= 0)
  96             printf("%u ", requestData.channelId);
  97         SEND_BH("message=\"Invalid line received\"");
  98         return;
  99     }
 100     OutputHHA1(&requestData);
 101 }
 102
 103 static void
 104 ProcessArguments(int argc, char **argv)
 105 {
 106     if (int i = LDAPArguments(argc, argv))
 107         exit(i);
 108 }
 109
 110 int
 111 main(int argc, char **argv)
 112 {
 113     char buf[HELPER_INPUT_BUFFER];
 114     setbuf(stdout, NULL);
 115     ProcessArguments(argc, argv);
 116     while (fgets(buf, HELPER_INPUT_BUFFER, stdin) != NULL)
 117         DoOneRequest(buf);
 118     return EXIT_SUCCESS;
 119 }
 120