/* * digest_pw_auth.c * * AUTHOR: Robert Collins. Based on ncsa_auth.c by Arjan de Vet * <Arjan.deVet@adv.iae.nl> * LDAP backend extension by Flavio Pescuma, MARA Systems AB <flavio@marasystems.com> * * Example digest authentication program for Squid, based on the original * proxy_auth code from client_side.c, written by * Jon Thackray <jrmt@uk.gdscorp.com>. * * - comment lines are possible and should start with a '#'; * - empty or blank lines are possible; * - file format is username:password *  * To build a directory integrated backend, you need to be able to * calculate the HA1 returned to squid. To avoid storing a plaintext * password you can calculate MD5(username:realm:password) when the * user changes their password, and store the tuple username:realm:HA1. * then find the matching username:realm when squid asks for the * HA1. * * This implementation could be improved by using such a triple for * the file format.  However storing such a triple does little to * improve security: If compromised the username:realm:HA1 combination * is "plaintext equivalent" - for the purposes of digest authentication * they allow the user access. Password syncronisation is not tackled * by digest - just preventing on the wire compromise. * * Copyright (c) 2003  Robert Collins  <robertc@squid-cache.org> */#include "digest_common.h"#include "text_backend.h"#define PROGRAM_NAME "digest_pw_auth"voidusage(){    fprintf(stderr, "\n\t\tYou need at least to specify the backend database\n");    fprintf(stderr, "\t\t%s -D LDAP or file\n", PROGRAM_NAME);    exit(1);}voidGetHHA1(RequestData * requestData){    TextHHA1(requestData);}static voidParseBuffer(char *buf, RequestData * requestData){    char *p;    requestData->parsed = 0;    if ((p = strchr(buf, '\n')) != NULL)	*p = '\0';		/* strip \n */    if ((requestData->user = strtok(buf, "\"")) == NULL)	return;    if ((requestData->realm = strtok(NULL, "\"")) == NULL)	return;    if ((requestData->realm = strtok(NULL, "\"")) == NULL)	return;    requestData->parsed = -1;}static voidOutputHHA1(RequestData * requestData){    requestData->error = 0;    GetHHA1(requestData);    if (requestData->error) {	printf("ERR No such user\n");	return;    }    printf("%s\n", requestData->HHA1);}static voidDoOneRequest(char *buf){    RequestData requestData;    ParseBuffer(buf, &requestData);    if (!requestData.parsed) {	printf("ERR\n");	return;    }    OutputHHA1(&requestData);}voidProcessArguments(int argc, char **argv){    TextArguments(argc, argv);}intmain(int argc, char **argv){    char buf[256];    setbuf(stdout, NULL);    ProcessArguments(argc, argv);    while (fgets(buf, 256, stdin) != NULL)	DoOneRequest(buf);    exit(0);}