599 lines
17 KiB
C
599 lines
17 KiB
C
/***************************************************************************
|
|
* _ _ ____ _
|
|
* Project ___| | | | _ \| |
|
|
* / __| | | | |_) | |
|
|
* | (__| |_| | _ <| |___
|
|
* \___|\___/|_| \_\_____|
|
|
*
|
|
* Copyright (C) 1998 - 2014, 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.
|
|
*
|
|
***************************************************************************/
|
|
|
|
#include "curl_setup.h"
|
|
|
|
#if !defined(CURL_DISABLE_HTTP) && !defined(CURL_DISABLE_CRYPTO_AUTH)
|
|
|
|
#include "urldata.h"
|
|
#include "rawstr.h"
|
|
#include "curl_base64.h"
|
|
#include "curl_md5.h"
|
|
#include "http_digest.h"
|
|
#include "strtok.h"
|
|
#include "curl_memory.h"
|
|
#include "vtls/vtls.h" /* for Curl_rand() */
|
|
#include "non-ascii.h" /* included for Curl_convert_... prototypes */
|
|
#include "warnless.h"
|
|
|
|
#define _MPRINTF_REPLACE /* use our functions only */
|
|
#include <curl/mprintf.h>
|
|
|
|
/* The last #include file should be: */
|
|
#include "memdebug.h"
|
|
|
|
#define MAX_VALUE_LENGTH 256
|
|
#define MAX_CONTENT_LENGTH 1024
|
|
|
|
static void digest_cleanup_one(struct digestdata *dig);
|
|
|
|
/*
|
|
* Return 0 on success and then the buffers are filled in fine.
|
|
*
|
|
* Non-zero means failure to parse.
|
|
*/
|
|
static int get_pair(const char *str, char *value, char *content,
|
|
const char **endptr)
|
|
{
|
|
int c;
|
|
bool starts_with_quote = FALSE;
|
|
bool escape = FALSE;
|
|
|
|
for(c=MAX_VALUE_LENGTH-1; (*str && (*str != '=') && c--); )
|
|
*value++ = *str++;
|
|
*value=0;
|
|
|
|
if('=' != *str++)
|
|
/* eek, no match */
|
|
return 1;
|
|
|
|
if('\"' == *str) {
|
|
/* this starts with a quote so it must end with one as well! */
|
|
str++;
|
|
starts_with_quote = TRUE;
|
|
}
|
|
|
|
for(c=MAX_CONTENT_LENGTH-1; *str && c--; str++) {
|
|
switch(*str) {
|
|
case '\\':
|
|
if(!escape) {
|
|
/* possibly the start of an escaped quote */
|
|
escape = TRUE;
|
|
*content++ = '\\'; /* even though this is an escape character, we still
|
|
store it as-is in the target buffer */
|
|
continue;
|
|
}
|
|
break;
|
|
case ',':
|
|
if(!starts_with_quote) {
|
|
/* this signals the end of the content if we didn't get a starting
|
|
quote and then we do "sloppy" parsing */
|
|
c=0; /* the end */
|
|
continue;
|
|
}
|
|
break;
|
|
case '\r':
|
|
case '\n':
|
|
/* end of string */
|
|
c=0;
|
|
continue;
|
|
case '\"':
|
|
if(!escape && starts_with_quote) {
|
|
/* end of string */
|
|
c=0;
|
|
continue;
|
|
}
|
|
break;
|
|
}
|
|
escape = FALSE;
|
|
*content++ = *str;
|
|
}
|
|
*content=0;
|
|
|
|
*endptr = str;
|
|
|
|
return 0; /* all is fine! */
|
|
}
|
|
|
|
/* Test example headers:
|
|
|
|
WWW-Authenticate: Digest realm="testrealm", nonce="1053604598"
|
|
Proxy-Authenticate: Digest realm="testrealm", nonce="1053604598"
|
|
|
|
*/
|
|
|
|
CURLdigest Curl_input_digest(struct connectdata *conn,
|
|
bool proxy,
|
|
const char *header) /* rest of the *-authenticate:
|
|
header */
|
|
{
|
|
char *token = NULL;
|
|
char *tmp = NULL;
|
|
bool foundAuth = FALSE;
|
|
bool foundAuthInt = FALSE;
|
|
struct SessionHandle *data=conn->data;
|
|
bool before = FALSE; /* got a nonce before */
|
|
struct digestdata *d;
|
|
|
|
if(proxy) {
|
|
d = &data->state.proxydigest;
|
|
}
|
|
else {
|
|
d = &data->state.digest;
|
|
}
|
|
|
|
if(checkprefix("Digest", header)) {
|
|
header += strlen("Digest");
|
|
|
|
/* If we already have received a nonce, keep that in mind */
|
|
if(d->nonce)
|
|
before = TRUE;
|
|
|
|
/* clear off any former leftovers and init to defaults */
|
|
digest_cleanup_one(d);
|
|
|
|
for(;;) {
|
|
char value[MAX_VALUE_LENGTH];
|
|
char content[MAX_CONTENT_LENGTH];
|
|
|
|
while(*header && ISSPACE(*header))
|
|
header++;
|
|
|
|
/* extract a value=content pair */
|
|
if(!get_pair(header, value, content, &header)) {
|
|
if(Curl_raw_equal(value, "nonce")) {
|
|
d->nonce = strdup(content);
|
|
if(!d->nonce)
|
|
return CURLDIGEST_NOMEM;
|
|
}
|
|
else if(Curl_raw_equal(value, "stale")) {
|
|
if(Curl_raw_equal(content, "true")) {
|
|
d->stale = TRUE;
|
|
d->nc = 1; /* we make a new nonce now */
|
|
}
|
|
}
|
|
else if(Curl_raw_equal(value, "realm")) {
|
|
d->realm = strdup(content);
|
|
if(!d->realm)
|
|
return CURLDIGEST_NOMEM;
|
|
}
|
|
else if(Curl_raw_equal(value, "opaque")) {
|
|
d->opaque = strdup(content);
|
|
if(!d->opaque)
|
|
return CURLDIGEST_NOMEM;
|
|
}
|
|
else if(Curl_raw_equal(value, "qop")) {
|
|
char *tok_buf;
|
|
/* tokenize the list and choose auth if possible, use a temporary
|
|
clone of the buffer since strtok_r() ruins it */
|
|
tmp = strdup(content);
|
|
if(!tmp)
|
|
return CURLDIGEST_NOMEM;
|
|
token = strtok_r(tmp, ",", &tok_buf);
|
|
while(token != NULL) {
|
|
if(Curl_raw_equal(token, "auth")) {
|
|
foundAuth = TRUE;
|
|
}
|
|
else if(Curl_raw_equal(token, "auth-int")) {
|
|
foundAuthInt = TRUE;
|
|
}
|
|
token = strtok_r(NULL, ",", &tok_buf);
|
|
}
|
|
free(tmp);
|
|
/*select only auth o auth-int. Otherwise, ignore*/
|
|
if(foundAuth) {
|
|
d->qop = strdup("auth");
|
|
if(!d->qop)
|
|
return CURLDIGEST_NOMEM;
|
|
}
|
|
else if(foundAuthInt) {
|
|
d->qop = strdup("auth-int");
|
|
if(!d->qop)
|
|
return CURLDIGEST_NOMEM;
|
|
}
|
|
}
|
|
else if(Curl_raw_equal(value, "algorithm")) {
|
|
d->algorithm = strdup(content);
|
|
if(!d->algorithm)
|
|
return CURLDIGEST_NOMEM;
|
|
if(Curl_raw_equal(content, "MD5-sess"))
|
|
d->algo = CURLDIGESTALGO_MD5SESS;
|
|
else if(Curl_raw_equal(content, "MD5"))
|
|
d->algo = CURLDIGESTALGO_MD5;
|
|
else
|
|
return CURLDIGEST_BADALGO;
|
|
}
|
|
else {
|
|
/* unknown specifier, ignore it! */
|
|
}
|
|
}
|
|
else
|
|
break; /* we're done here */
|
|
|
|
/* pass all additional spaces here */
|
|
while(*header && ISSPACE(*header))
|
|
header++;
|
|
if(',' == *header)
|
|
/* allow the list to be comma-separated */
|
|
header++;
|
|
}
|
|
/* We had a nonce since before, and we got another one now without
|
|
'stale=true'. This means we provided bad credentials in the previous
|
|
request */
|
|
if(before && !d->stale)
|
|
return CURLDIGEST_BAD;
|
|
|
|
/* We got this header without a nonce, that's a bad Digest line! */
|
|
if(!d->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++)
|
|
snprintf((char *)&dest[i*2], 3, "%02x", source[i]);
|
|
}
|
|
|
|
/* Perform quoted-string escaping as described in RFC2616 and its errata */
|
|
static char *string_quoted(const char *source)
|
|
{
|
|
char *dest, *d;
|
|
const char *s = source;
|
|
size_t n = 1; /* null terminator */
|
|
|
|
/* Calculate size needed */
|
|
while(*s) {
|
|
++n;
|
|
if(*s == '"' || *s == '\\') {
|
|
++n;
|
|
}
|
|
++s;
|
|
}
|
|
|
|
dest = malloc(n);
|
|
if(dest) {
|
|
s = source;
|
|
d = dest;
|
|
while(*s) {
|
|
if(*s == '"' || *s == '\\') {
|
|
*d++ = '\\';
|
|
}
|
|
*d++ = *s++;
|
|
}
|
|
*d = 0;
|
|
}
|
|
|
|
return dest;
|
|
}
|
|
|
|
CURLcode Curl_output_digest(struct connectdata *conn,
|
|
bool proxy,
|
|
const unsigned char *request,
|
|
const 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, */
|
|
size_t urilen;
|
|
unsigned char md5buf[16]; /* 16 bytes/128 bits */
|
|
unsigned char request_digest[33];
|
|
unsigned char *md5this;
|
|
unsigned char ha1[33];/* 32 digits and 1 zero byte */
|
|
unsigned char ha2[33];/* 32 digits and 1 zero byte */
|
|
char cnoncebuf[33];
|
|
char *cnonce = NULL;
|
|
size_t cnonce_sz = 0;
|
|
char *tmp = NULL;
|
|
char **allocuserpwd;
|
|
size_t userlen;
|
|
const char *userp;
|
|
char *userp_quoted;
|
|
const char *passwdp;
|
|
struct auth *authp;
|
|
|
|
struct SessionHandle *data = conn->data;
|
|
struct digestdata *d;
|
|
CURLcode rc;
|
|
/* The CURL_OUTPUT_DIGEST_CONV macro below is for non-ASCII machines.
|
|
It converts digest text to ASCII so the MD5 will be correct for
|
|
what ultimately goes over the network.
|
|
*/
|
|
#define CURL_OUTPUT_DIGEST_CONV(a, b) \
|
|
rc = Curl_convert_to_network(a, (char *)b, strlen((const char*)b)); \
|
|
if(rc != CURLE_OK) { \
|
|
free(b); \
|
|
return rc; \
|
|
}
|
|
|
|
if(proxy) {
|
|
d = &data->state.proxydigest;
|
|
allocuserpwd = &conn->allocptr.proxyuserpwd;
|
|
userp = conn->proxyuser;
|
|
passwdp = conn->proxypasswd;
|
|
authp = &data->state.authproxy;
|
|
}
|
|
else {
|
|
d = &data->state.digest;
|
|
allocuserpwd = &conn->allocptr.userpwd;
|
|
userp = conn->user;
|
|
passwdp = conn->passwd;
|
|
authp = &data->state.authhost;
|
|
}
|
|
|
|
Curl_safefree(*allocuserpwd);
|
|
|
|
/* not set means empty */
|
|
if(!userp)
|
|
userp="";
|
|
|
|
if(!passwdp)
|
|
passwdp="";
|
|
|
|
if(!d->nonce) {
|
|
authp->done = FALSE;
|
|
return CURLE_OK;
|
|
}
|
|
authp->done = TRUE;
|
|
|
|
if(!d->nc)
|
|
d->nc = 1;
|
|
|
|
if(!d->cnonce) {
|
|
snprintf(cnoncebuf, sizeof(cnoncebuf), "%08x%08x%08x%08x",
|
|
Curl_rand(data), Curl_rand(data),
|
|
Curl_rand(data), Curl_rand(data));
|
|
rc = Curl_base64_encode(data, cnoncebuf, strlen(cnoncebuf),
|
|
&cnonce, &cnonce_sz);
|
|
if(rc)
|
|
return rc;
|
|
d->cnonce = cnonce;
|
|
}
|
|
|
|
/*
|
|
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)
|
|
*/
|
|
|
|
md5this = (unsigned char *)
|
|
aprintf("%s:%s:%s", userp, d->realm, passwdp);
|
|
if(!md5this)
|
|
return CURLE_OUT_OF_MEMORY;
|
|
|
|
CURL_OUTPUT_DIGEST_CONV(data, md5this); /* convert on non-ASCII machines */
|
|
Curl_md5it(md5buf, md5this);
|
|
Curl_safefree(md5this);
|
|
md5_to_ascii(md5buf, ha1);
|
|
|
|
if(d->algo == CURLDIGESTALGO_MD5SESS) {
|
|
/* nonce and cnonce are OUTSIDE the hash */
|
|
tmp = aprintf("%s:%s:%s", ha1, d->nonce, d->cnonce);
|
|
if(!tmp)
|
|
return CURLE_OUT_OF_MEMORY;
|
|
CURL_OUTPUT_DIGEST_CONV(data, tmp); /* convert on non-ASCII machines */
|
|
Curl_md5it(md5buf, (unsigned char *)tmp);
|
|
Curl_safefree(tmp);
|
|
md5_to_ascii(md5buf, ha1);
|
|
}
|
|
|
|
/*
|
|
If the "qop" directive's value is "auth" or is unspecified, then A2 is:
|
|
|
|
A2 = Method ":" digest-uri-value
|
|
|
|
If the "qop" value is "auth-int", then A2 is:
|
|
|
|
A2 = Method ":" digest-uri-value ":" H(entity-body)
|
|
|
|
(The "Method" value is the HTTP request method as specified in section
|
|
5.1.1 of RFC 2616)
|
|
*/
|
|
|
|
/* So IE browsers < v7 cut off the URI part at the query part when they
|
|
evaluate the MD5 and some (IIS?) servers work with them so we may need to
|
|
do the Digest IE-style. Note that the different ways cause different MD5
|
|
sums to get sent.
|
|
|
|
Apache servers can be set to do the Digest IE-style automatically using
|
|
the BrowserMatch feature:
|
|
http://httpd.apache.org/docs/2.2/mod/mod_auth_digest.html#msie
|
|
|
|
Further details on Digest implementation differences:
|
|
http://www.fngtps.com/2006/09/http-authentication
|
|
*/
|
|
|
|
if(authp->iestyle && ((tmp = strchr((char *)uripath, '?')) != NULL))
|
|
urilen = tmp - (char *)uripath;
|
|
else
|
|
urilen = strlen((char *)uripath);
|
|
|
|
md5this = (unsigned char *)aprintf("%s:%.*s", request, urilen, uripath);
|
|
|
|
if(d->qop && Curl_raw_equal(d->qop, "auth-int")) {
|
|
/* We don't support auth-int for PUT or POST at the moment.
|
|
TODO: replace md5 of empty string with entity-body for PUT/POST */
|
|
unsigned char *md5this2 = (unsigned char *)
|
|
aprintf("%s:%s", md5this, "d41d8cd98f00b204e9800998ecf8427e");
|
|
Curl_safefree(md5this);
|
|
md5this = md5this2;
|
|
}
|
|
|
|
if(!md5this)
|
|
return CURLE_OUT_OF_MEMORY;
|
|
|
|
CURL_OUTPUT_DIGEST_CONV(data, md5this); /* convert on non-ASCII machines */
|
|
Curl_md5it(md5buf, md5this);
|
|
Curl_safefree(md5this);
|
|
md5_to_ascii(md5buf, ha2);
|
|
|
|
if(d->qop) {
|
|
md5this = (unsigned char *)aprintf("%s:%s:%08x:%s:%s:%s",
|
|
ha1,
|
|
d->nonce,
|
|
d->nc,
|
|
d->cnonce,
|
|
d->qop,
|
|
ha2);
|
|
}
|
|
else {
|
|
md5this = (unsigned char *)aprintf("%s:%s:%s",
|
|
ha1,
|
|
d->nonce,
|
|
ha2);
|
|
}
|
|
if(!md5this)
|
|
return CURLE_OUT_OF_MEMORY;
|
|
|
|
CURL_OUTPUT_DIGEST_CONV(data, md5this); /* convert on non-ASCII machines */
|
|
Curl_md5it(md5buf, md5this);
|
|
Curl_safefree(md5this);
|
|
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"
|
|
|
|
Digest parameters are all quoted strings. Username which is provided by
|
|
the user will need double quotes and backslashes within it escaped. For
|
|
the other fields, this shouldn't be an issue. realm, nonce, and opaque
|
|
are copied as is from the server, escapes and all. cnonce is generated
|
|
with web-safe characters. uri is already percent encoded. nc is 8 hex
|
|
characters. algorithm and qop with standard values only contain web-safe
|
|
chracters.
|
|
*/
|
|
userp_quoted = string_quoted(userp);
|
|
if(!userp_quoted)
|
|
return CURLE_OUT_OF_MEMORY;
|
|
|
|
if(d->qop) {
|
|
*allocuserpwd =
|
|
aprintf( "%sAuthorization: Digest "
|
|
"username=\"%s\", "
|
|
"realm=\"%s\", "
|
|
"nonce=\"%s\", "
|
|
"uri=\"%.*s\", "
|
|
"cnonce=\"%s\", "
|
|
"nc=%08x, "
|
|
"qop=%s, "
|
|
"response=\"%s\"",
|
|
proxy?"Proxy-":"",
|
|
userp_quoted,
|
|
d->realm,
|
|
d->nonce,
|
|
urilen, uripath, /* this is the PATH part of the URL */
|
|
d->cnonce,
|
|
d->nc,
|
|
d->qop,
|
|
request_digest);
|
|
|
|
if(Curl_raw_equal(d->qop, "auth"))
|
|
d->nc++; /* The nc (from RFC) has to be a 8 hex digit number 0 padded
|
|
which tells to the server how many times you are using the
|
|
same nonce in the qop=auth mode. */
|
|
}
|
|
else {
|
|
*allocuserpwd =
|
|
aprintf( "%sAuthorization: Digest "
|
|
"username=\"%s\", "
|
|
"realm=\"%s\", "
|
|
"nonce=\"%s\", "
|
|
"uri=\"%.*s\", "
|
|
"response=\"%s\"",
|
|
proxy?"Proxy-":"",
|
|
userp_quoted,
|
|
d->realm,
|
|
d->nonce,
|
|
urilen, uripath, /* this is the PATH part of the URL */
|
|
request_digest);
|
|
}
|
|
Curl_safefree(userp_quoted);
|
|
if(!*allocuserpwd)
|
|
return CURLE_OUT_OF_MEMORY;
|
|
|
|
/* Add optional fields */
|
|
if(d->opaque) {
|
|
/* append opaque */
|
|
tmp = aprintf("%s, opaque=\"%s\"", *allocuserpwd, d->opaque);
|
|
if(!tmp)
|
|
return CURLE_OUT_OF_MEMORY;
|
|
free(*allocuserpwd);
|
|
*allocuserpwd = tmp;
|
|
}
|
|
|
|
if(d->algorithm) {
|
|
/* append algorithm */
|
|
tmp = aprintf("%s, algorithm=\"%s\"", *allocuserpwd, d->algorithm);
|
|
if(!tmp)
|
|
return CURLE_OUT_OF_MEMORY;
|
|
free(*allocuserpwd);
|
|
*allocuserpwd = tmp;
|
|
}
|
|
|
|
/* append CRLF + zero (3 bytes) to the userpwd header */
|
|
userlen = strlen(*allocuserpwd);
|
|
tmp = realloc(*allocuserpwd, userlen + 3);
|
|
if(!tmp)
|
|
return CURLE_OUT_OF_MEMORY;
|
|
strcpy(&tmp[userlen], "\r\n"); /* append the data */
|
|
*allocuserpwd = tmp;
|
|
|
|
return CURLE_OK;
|
|
}
|
|
|
|
static void digest_cleanup_one(struct digestdata *d)
|
|
{
|
|
Curl_safefree(d->nonce);
|
|
Curl_safefree(d->cnonce);
|
|
Curl_safefree(d->realm);
|
|
Curl_safefree(d->opaque);
|
|
Curl_safefree(d->qop);
|
|
Curl_safefree(d->algorithm);
|
|
|
|
d->nc = 0;
|
|
d->algo = CURLDIGESTALGO_MD5; /* default algorithm */
|
|
d->stale = FALSE; /* default means normal, not stale */
|
|
}
|
|
|
|
|
|
void Curl_digest_cleanup(struct SessionHandle *data)
|
|
{
|
|
digest_cleanup_one(&data->state.digest);
|
|
digest_cleanup_one(&data->state.proxydigest);
|
|
}
|
|
|
|
#endif
|