/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 1998 - 2004, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at http://curl.haxx.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
* $Id$
***************************************************************************/
#include "setup.h"
#ifndef CURL_DISABLE_HTTP
/* -- WIN32 approved -- */
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
#include <stdlib.h>
#include <ctype.h>
#include "urldata.h"
#include "sendf.h"
#include "strequal.h"
#include "md5.h"
#include "http_digest.h"
#define _MPRINTF_REPLACE /* use our functions only */
#include <curl/mprintf.h>
/* The last #include file should be: */
#ifdef CURLDEBUG
#include "memdebug.h"
#endif
/* Test example header:
WWW-Authenticate: Digest realm="testrealm", nonce="1053604598"
*/
CURLdigest Curl_input_digest(struct connectdata *conn,
char *header) /* rest of the www-authenticate:
header */
{
bool more = TRUE;
struct SessionHandle *data=conn->data;
/* skip initial whitespaces */
while(*header && isspace((int)*header))
header++;
if(checkprefix("Digest", header)) {
header += strlen("Digest");
/* clear off any former leftovers and init to defaults */
Curl_digest_cleanup(data);
while(more) {
char value[32];
char content[128];
int totlen=0;
while(*header && isspace((int)*header))
header++;
/* how big can these strings be? */
if(2 == sscanf(header, "%31[^=]=\"%127[^\"]\"",
value, content)) {
if(strequal(value, "nonce")) {
data->state.digest.nonce = strdup(content);
}
else if(strequal(value, "cnonce")) {
data->state.digest.cnonce = strdup(content);
}
else if(strequal(value, "realm")) {
data->state.digest.realm = strdup(content);
}
else if(strequal(value, "algorithm")) {
if(strequal(content, "MD5-sess"))
data->state.digest.algo = CURLDIGESTALGO_MD5SESS;
/* else, remain using the default md5 */
}
else {
/* unknown specifier, ignore it! */
}
totlen = strlen(value)+strlen(content)+3;
}
else
break; /* we're done here */
header += totlen;
if(',' == *header)
/* allow the list to be comma-separated */
header++;
}
if(!data->state.digest.nonce)
return CURLDIGEST_BAD;
}
else
/* else not a digest, get out */
return CURLDIGEST_NONE;
return CURLDIGEST_FINE;
}
/* convert md5 chunk to RFC2617 (section 3.1.3) -suitable ascii string*/
static void md5_to_ascii(unsigned char *source, /* 16 bytes */
unsigned char *dest) /* 33 bytes */
{
int i;
for(i=0; i<16; i++)
sprintf((char *)&dest[i*2], "%02x", source[i]);
}
CURLcode Curl_output_digest(struct connectdata *conn,
unsigned char *request,
unsigned char *uripath)
{
/* We have a Digest setup for this, use it! Now, to get all the details for
this sorted out, I must urge you dear friend to read up on the RFC2617
section 3.2.2, */
unsigned char md5buf[16]; /* 16 bytes/128 bits */
unsigned char ha1[33]; /* 32 digits and 1 zero byte */
unsigned char ha2[33];
unsigned char request_digest[33];
unsigned char *md5this;
struct SessionHandle *data = conn->data;
/*
if the algorithm is "MD5" or unspecified (which then defaults to MD5):
A1 = unq(username-value) ":" unq(realm-value) ":" passwd
if the algorithm is "MD5-sess" then:
A1 = H( unq(username-value) ":" unq(realm-value) ":" passwd )
":" unq(nonce-value) ":" unq(cnonce-value)
*/
if(data->state.digest.algo == CURLDIGESTALGO_MD5SESS) {
md5this = (unsigned char *)
aprintf("%s:%s:%s:%s:%s",
conn->user,
data->state.digest.realm,
conn->passwd,
data->state.digest.nonce,
data->state.digest.cnonce);
}
else {
md5this = (unsigned char *)
aprintf("%s:%s:%s",
conn->user,
data->state.digest.realm,
conn->passwd);
}
Curl_md5it(md5buf, md5this);
free(md5this); /* free this again */
md5_to_ascii(md5buf, ha1);
/*
A2 = Method ":" digest-uri-value
(The "Method" value is the HTTP request method as specified in section
5.1.1 of RFC 2616)
*/
md5this = (unsigned char *)aprintf("%s:%s", request, uripath);
Curl_md5it(md5buf, md5this);
free(md5this); /* free this again */
md5_to_ascii(md5buf, ha2);
md5this = (unsigned char *)aprintf("%s:%s:%s", ha1, data->state.digest.nonce,
ha2);
Curl_md5it(md5buf, md5this);
free(md5this); /* free this again */
md5_to_ascii(md5buf, request_digest);
/* for test case 64 (snooped from a Mozilla 1.3a request)
Authorization: Digest username="testuser", realm="testrealm", \
nonce="1053604145", uri="/64", response="c55f7f30d83d774a3d2dcacf725abaca"
*/
conn->allocptr.userpwd =
aprintf( "Authorization: Digest "
"username=\"%s\", "
"realm=\"%s\", "
"nonce=\"%s\", "
"uri=\"%s\", "
"response=\"%s\"\r\n",
conn->user,
data->state.digest.realm,
data->state.digest.nonce,
uripath, /* this is the PATH part of the URL */
request_digest );
return CURLE_OK;
}
void Curl_digest_cleanup(struct SessionHandle *data)
{
if(data->state.digest.nonce)
free(data->state.digest.nonce);
data->state.digest.nonce = NULL;
if(data->state.digest.cnonce)
free(data->state.digest.cnonce);
data->state.digest.cnonce = NULL;
if(data->state.digest.realm)
free(data->state.digest.realm);
data->state.digest.realm = NULL;
data->state.digest.algo = CURLDIGESTALGO_MD5; /* default algorithm */
}
#endif