517 lines
15 KiB
C
517 lines
15 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 - 2008, 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: http_digest.c,v 1.44 2008-10-23 11:49:19 bagder Exp $
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***************************************************************************/
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#include "setup.h"
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#if !defined(CURL_DISABLE_HTTP) && !defined(CURL_DISABLE_CRYPTO_AUTH)
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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 "rawstr.h"
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#include "curl_base64.h"
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#include "curl_md5.h"
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#include "http_digest.h"
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#include "strtok.h"
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#include "url.h" /* for Curl_safefree() */
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#include "memory.h"
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#include "easyif.h" /* included for Curl_convert_... prototypes */
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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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#include "memdebug.h"
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/* Test example headers:
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WWW-Authenticate: Digest realm="testrealm", nonce="1053604598"
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Proxy-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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bool proxy,
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const char *header) /* rest of the *-authenticate:
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header */
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{
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bool more = TRUE;
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char *token = NULL;
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char *tmp = NULL;
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bool foundAuth = FALSE;
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bool foundAuthInt = FALSE;
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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;
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if(proxy) {
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d = &data->state.proxydigest;
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}
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else {
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d = &data->state.digest;
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}
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/* skip initial whitespaces */
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while(*header && ISSPACE(*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_one(d);
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while(more) {
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char value[256];
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char content[1024];
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size_t totlen=0;
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while(*header && ISSPACE(*header))
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header++;
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/* how big can these strings be? */
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if((2 == sscanf(header, "%255[^=]=\"%1023[^\"]\"",
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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, newline or carriage return */
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(2 == sscanf(header, "%255[^=]=%1023[^\r\n,]",
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value, content)) ) {
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if(!strcmp("\"\"", content)) {
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/* for the name="" case where we get only the "" in the content variable,
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* simply clear the content then
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*/
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content[0]=0;
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}
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if(Curl_raw_equal(value, "nonce")) {
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d->nonce = strdup(content);
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if(!d->nonce)
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return CURLDIGEST_NOMEM;
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}
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else if(Curl_raw_equal(value, "stale")) {
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if(Curl_raw_equal(content, "true")) {
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d->stale = TRUE;
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d->nc = 1; /* we make a new nonce now */
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}
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}
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else if(Curl_raw_equal(value, "realm")) {
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d->realm = strdup(content);
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if(!d->realm)
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return CURLDIGEST_NOMEM;
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}
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else if(Curl_raw_equal(value, "opaque")) {
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d->opaque = strdup(content);
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if(!d->opaque)
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return CURLDIGEST_NOMEM;
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}
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else if(Curl_raw_equal(value, "qop")) {
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char *tok_buf;
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/* tokenize the list and choose auth if possible, use a temporary
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clone of the buffer since strtok_r() ruins it */
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tmp = strdup(content);
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if(!tmp)
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return CURLDIGEST_NOMEM;
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token = strtok_r(tmp, ",", &tok_buf);
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while(token != NULL) {
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if(Curl_raw_equal(token, "auth")) {
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foundAuth = TRUE;
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}
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else if(Curl_raw_equal(token, "auth-int")) {
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foundAuthInt = TRUE;
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}
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token = strtok_r(NULL, ",", &tok_buf);
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}
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free(tmp);
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/*select only auth o auth-int. Otherwise, ignore*/
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if(foundAuth) {
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d->qop = strdup("auth");
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if(!d->qop)
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return CURLDIGEST_NOMEM;
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}
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else if(foundAuthInt) {
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d->qop = strdup("auth-int");
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if(!d->qop)
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return CURLDIGEST_NOMEM;
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}
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}
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else if(Curl_raw_equal(value, "algorithm")) {
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d->algorithm = strdup(content);
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if(!d->algorithm)
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return CURLDIGEST_NOMEM;
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if(Curl_raw_equal(content, "MD5-sess"))
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d->algo = CURLDIGESTALGO_MD5SESS;
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else if(Curl_raw_equal(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)+1;
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if(header[strlen(value)+1] == '\"')
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/* the contents were within quotes, then add 2 for them to the
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length */
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totlen += 2;
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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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/* pass all additional spaces here */
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while(*header && ISSPACE(*header))
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header++;
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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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snprintf((char *)&dest[i*2], 3, "%02x", source[i]);
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}
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CURLcode Curl_output_digest(struct connectdata *conn,
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bool proxy,
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const unsigned char *request,
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const 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 request_digest[33];
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unsigned char *md5this;
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unsigned char *ha1;
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unsigned char ha2[33];/* 32 digits and 1 zero byte */
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char cnoncebuf[7];
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char *cnonce;
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char *tmp = NULL;
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struct timeval now;
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char **allocuserpwd;
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const char *userp;
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const char *passwdp;
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struct auth *authp;
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struct SessionHandle *data = conn->data;
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struct digestdata *d;
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#ifdef CURL_DOES_CONVERSIONS
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CURLcode rc;
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/* The CURL_OUTPUT_DIGEST_CONV macro below is for non-ASCII machines.
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It converts digest text to ASCII so the MD5 will be correct for
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what ultimately goes over the network.
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*/
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#define CURL_OUTPUT_DIGEST_CONV(a, b) \
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rc = Curl_convert_to_network(a, (char *)b, strlen((const char*)b)); \
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if(rc != CURLE_OK) { \
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free(b); \
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return rc; \
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}
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#else
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#define CURL_OUTPUT_DIGEST_CONV(a, b)
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#endif /* CURL_DOES_CONVERSIONS */
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if(proxy) {
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d = &data->state.proxydigest;
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allocuserpwd = &conn->allocptr.proxyuserpwd;
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userp = conn->proxyuser;
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passwdp = conn->proxypasswd;
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authp = &data->state.authproxy;
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}
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else {
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d = &data->state.digest;
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allocuserpwd = &conn->allocptr.userpwd;
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userp = conn->user;
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passwdp = conn->passwd;
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authp = &data->state.authhost;
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}
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if(*allocuserpwd) {
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Curl_safefree(*allocuserpwd);
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*allocuserpwd = NULL;
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}
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/* not set means empty */
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if(!userp)
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userp="";
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if(!passwdp)
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passwdp="";
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if(!d->nonce) {
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authp->done = FALSE;
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return CURLE_OK;
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}
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authp->done = TRUE;
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if(!d->nc)
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d->nc = 1;
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if(!d->cnonce) {
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/* Generate a cnonce */
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now = Curl_tvnow();
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snprintf(cnoncebuf, sizeof(cnoncebuf), "%06ld", (long)now.tv_sec);
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if(Curl_base64_encode(data, cnoncebuf, strlen(cnoncebuf), &cnonce))
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d->cnonce = cnonce;
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else
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return CURLE_OUT_OF_MEMORY;
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}
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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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md5this = (unsigned char *)
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aprintf("%s:%s:%s", userp, d->realm, passwdp);
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if(!md5this)
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return CURLE_OUT_OF_MEMORY;
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CURL_OUTPUT_DIGEST_CONV(data, md5this); /* convert on non-ASCII machines */
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Curl_md5it(md5buf, md5this);
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free(md5this); /* free this again */
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ha1 = malloc(33); /* 32 digits and 1 zero byte */
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if(!ha1)
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return CURLE_OUT_OF_MEMORY;
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md5_to_ascii(md5buf, ha1);
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if(d->algo == CURLDIGESTALGO_MD5SESS) {
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/* nonce and cnonce are OUTSIDE the hash */
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tmp = aprintf("%s:%s:%s", ha1, d->nonce, d->cnonce);
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if(!tmp)
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return CURLE_OUT_OF_MEMORY;
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CURL_OUTPUT_DIGEST_CONV(data, tmp); /* convert on non-ASCII machines */
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Curl_md5it(md5buf, (unsigned char *)tmp);
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free(tmp); /* free this again */
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md5_to_ascii(md5buf, ha1);
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}
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/*
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If the "qop" directive's value is "auth" or is unspecified, then A2 is:
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A2 = Method ":" digest-uri-value
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If the "qop" value is "auth-int", then A2 is:
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A2 = Method ":" digest-uri-value ":" H(entity-body)
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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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if(!md5this) {
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free(ha1);
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return CURLE_OUT_OF_MEMORY;
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}
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if(d->qop && Curl_raw_equal(d->qop, "auth-int")) {
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/* We don't support auth-int at the moment. I can't see a easy way to get
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entity-body here */
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/* TODO: Append H(entity-body)*/
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}
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CURL_OUTPUT_DIGEST_CONV(data, md5this); /* convert on non-ASCII machines */
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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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if(d->qop) {
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md5this = (unsigned char *)aprintf("%s:%s:%08x:%s:%s:%s",
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ha1,
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d->nonce,
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d->nc,
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d->cnonce,
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d->qop,
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ha2);
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}
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else {
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md5this = (unsigned char *)aprintf("%s:%s:%s",
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ha1,
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d->nonce,
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ha2);
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}
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free(ha1);
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if(!md5this)
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return CURLE_OUT_OF_MEMORY;
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CURL_OUTPUT_DIGEST_CONV(data, md5this); /* convert on non-ASCII machines */
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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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if(d->qop) {
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*allocuserpwd =
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aprintf( "%sAuthorization: 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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"cnonce=\"%s\", "
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"nc=%08x, "
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"qop=\"%s\", "
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"response=\"%s\"",
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proxy?"Proxy-":"",
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userp,
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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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d->cnonce,
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d->nc,
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d->qop,
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request_digest);
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if(Curl_raw_equal(d->qop, "auth"))
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d->nc++; /* The nc (from RFC) has to be a 8 hex digit number 0 padded
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which tells to the server how many times you are using the
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same nonce in the qop=auth mode. */
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}
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else {
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*allocuserpwd =
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aprintf( "%sAuthorization: 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\"",
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proxy?"Proxy-":"",
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userp,
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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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}
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if(!*allocuserpwd)
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return CURLE_OUT_OF_MEMORY;
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/* Add optional fields */
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if(d->opaque) {
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/* append opaque */
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tmp = aprintf("%s, opaque=\"%s\"", *allocuserpwd, d->opaque);
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if(!tmp)
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return CURLE_OUT_OF_MEMORY;
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free(*allocuserpwd);
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*allocuserpwd = tmp;
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}
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if(d->algorithm) {
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/* append algorithm */
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tmp = aprintf("%s, algorithm=\"%s\"", *allocuserpwd, d->algorithm);
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if(!tmp)
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return CURLE_OUT_OF_MEMORY;
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free(*allocuserpwd);
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*allocuserpwd = tmp;
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}
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/* append CRLF to the userpwd header */
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tmp = realloc(*allocuserpwd, strlen(*allocuserpwd) + 3 + 1);
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if(!tmp)
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return CURLE_OUT_OF_MEMORY;
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strcat(tmp, "\r\n");
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*allocuserpwd = tmp;
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return CURLE_OK;
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}
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void Curl_digest_cleanup_one(struct digestdata *d)
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{
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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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if(d->opaque)
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free(d->opaque);
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d->opaque = NULL;
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if(d->qop)
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free(d->qop);
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d->qop = NULL;
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if(d->algorithm)
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free(d->algorithm);
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d->algorithm = NULL;
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d->nc = 0;
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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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void Curl_digest_cleanup(struct SessionHandle *data)
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{
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Curl_digest_cleanup_one(&data->state.digest);
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Curl_digest_cleanup_one(&data->state.proxydigest);
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}
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#endif
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