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