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CURLOPT_SOCKS5_AUTH: allowed methods for SOCKS5 proxy auth

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If libcurl was built with GSS-API support, it unconditionally advertised
GSS-API authentication while connecting to a SOCKS5 proxy.  This caused
problems in environments with improperly configured Kerberos: a stock
libcurl failed to connect, despite libcurl built without GSS-API
connected fine using username and password.

This commit introduces the CURLOPT_SOCKS5_AUTH option to control the
allowed methods for SOCKS5 authentication at run time.

Note that a new option was preferred over reusing CURLOPT_PROXYAUTH
for compatibility reasons because the set of authentication methods
allowed by default was different for HTTP and SOCKS5 proxies.

Bug: https://curl.haxx.se/mail/lib-2017-01/0005.html
Closes https://github.com/curl/curl/pull/1454
This commit is contained in:
Kamil Dudka 2017-04-27 15:18:49 +02:00
parent cd1c9f0807
commit 8924f58c37
7 changed files with 99 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
docs/libcurl/curl_easy_setopt.3
View File

@ -173,6 +173,8 @@ Filter out hosts from proxy use. \fICURLOPT_NOPROXY(3)\fP
Tunnel through the HTTP proxy. \fICURLOPT_HTTPPROXYTUNNEL(3)\fP
.IP CURLOPT_CONNECT_TO
Connect to a specific host and port. See \fICURLOPT_CONNECT_TO(3)\fP
.IP CURLOPT_SOCKS5_AUTH
Socks5 authentication methods. See \fICURLOPT_SOCKS5_AUTH(3)\fP
.IP CURLOPT_SOCKS5_GSSAPI_SERVICE
Socks5 GSSAPI service name. \fICURLOPT_SOCKS5_GSSAPI_SERVICE(3)\fP
.IP CURLOPT_SOCKS5_GSSAPI_NEC

63
docs/libcurl/opts/CURLOPT_SOCKS5_AUTH.3 Normal file
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@ -0,0 +1,63 @@
.\" **************************************************************************
.\" * _ _ ____ _
.\" * Project ___| | | | _ \| |
.\" * / __| | | | |_) | |
.\" * | (__| |_| | _ <| |___
.\" * \___|\___/|_| \_\_____|
.\" *
.\" * Copyright (C) 1998 - 2017, 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 https://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.
.\" *
.\" **************************************************************************
.\"
.TH CURLOPT_SOCKS5_AUTH 3 "27 April 2017" "libcurl 7.55.0" "curl_easy_setopt options"
.SH NAME
CURLOPT_SOCKS5_AUTH \- set allowed methods for SOCKS5 proxy authentication
.SH SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_SOCKS5_AUTH, long bitmask);
.SH DESCRIPTION
Pass a long as parameter, which is set to a bitmask, to tell libcurl which
authentication method(s) are allowed for SOCKS5 proxy authentication. The only
supported flags are \fICURLAUTH_BASIC\fP, which allows username/password
authentication, \fICURLAUTH_GSSAPI\fP, which allows GSS-API authentication, and
\fICURLAUTH_NONE\fP, which allows no authentication. Set the actual user name
and password with the \fICURLOPT_PROXYUSERPWD(3)\fP option.
.SH DEFAULT
CURLAUTH_BASIC|CURLAUTH_GSSAPI
.SH PROTOCOLS
All
.SH EXAMPLE
.nf
CURL *curl = curl_easy_init();
if(curl) {
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");
/* request to use a SOCKS5 proxy */
curl_easy_setopt(curl, CURLOPT_PROXY, "socks5://user:pass@myproxy.com");
/* enable username/password authentication only */
curl_easy_setopt(curl, CURLOPT_SOCKS5_AUTH, CURLAUTH_BASIC);
/* Perform the request */
curl_easy_perform(curl);
}
.fi
.SH AVAILABILITY
Added in 7.55.0
.SH RETURN VALUE
Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or
CURLE_NOT_BUILT_IN if the bitmask contains unsupported flags.
.SH "SEE ALSO"
.BR CURLOPT_PROXY "(3), " CURLOPT_PROXYTYPE "(3)"

2
docs/libcurl/symbols-in-versions
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@ -17,6 +17,7 @@ CURLAUTH_ANYSAFE 7.10.6
CURLAUTH_BASIC 7.10.6
CURLAUTH_DIGEST 7.10.6
CURLAUTH_DIGEST_IE 7.19.3
CURLAUTH_GSSAPI 7.55.0
CURLAUTH_GSSNEGOTIATE 7.10.6 7.38.0
CURLAUTH_NEGOTIATE 7.38.0
CURLAUTH_NONE 7.10.6
@ -527,6 +528,7 @@ CURLOPT_SERVICE_NAME 7.43.0
CURLOPT_SHARE 7.10
CURLOPT_SOCKOPTDATA 7.16.0
CURLOPT_SOCKOPTFUNCTION 7.16.0
CURLOPT_SOCKS5_AUTH 7.55.0
CURLOPT_SOCKS5_GSSAPI_NEC 7.19.4
CURLOPT_SOCKS5_GSSAPI_SERVICE 7.19.4 7.49.0
CURLOPT_SOURCE_HOST 7.12.1 - 7.15.5

5
include/curl/curl.h
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@ -677,6 +677,8 @@ typedef enum {
#define CURLAUTH_NEGOTIATE (((unsigned long)1)<<2)
/* Deprecated since the advent of CURLAUTH_NEGOTIATE */
#define CURLAUTH_GSSNEGOTIATE CURLAUTH_NEGOTIATE
/* Used for CURLOPT_SOCKS5_AUTH to stay terminologically correct */
#define CURLAUTH_GSSAPI CURLAUTH_NEGOTIATE
#define CURLAUTH_NTLM (((unsigned long)1)<<3)
#define CURLAUTH_DIGEST_IE (((unsigned long)1)<<4)
#define CURLAUTH_NTLM_WB (((unsigned long)1)<<5)
@ -1783,6 +1785,9 @@ typedef enum {
/* The request target, instead of extracted from the URL */
CINIT(REQUEST_TARGET, STRINGPOINT, 266),
/* bitmask of allowed auth methods for connections to SOCKS5 proxies */
CINIT(SOCKS5_AUTH, LONG, 267),
CURLOPT_LASTENTRY /* the last unused */
} CURLoption;

27
lib/socks.c
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@ -387,6 +387,8 @@ CURLcode Curl_SOCKS5(const char *proxy_user,
(conn->socks_proxy.proxytype == CURLPROXY_SOCKS5) ? TRUE : FALSE;
const size_t hostname_len = strlen(hostname);
ssize_t len = 0;
const unsigned long auth = data->set.socks5auth;
bool allow_gssapi = FALSE;
if(conn->bits.httpproxy)
infof(conn->data, "SOCKS5: connecting to HTTP proxy %s port %d\n",
@ -427,13 +429,24 @@ CURLcode Curl_SOCKS5(const char *proxy_user,
return CURLE_COULDNT_CONNECT;
}
if(auth & ~(CURLAUTH_BASIC | CURLAUTH_GSSAPI))
infof(conn->data,
"warning: unsupported value passed to CURLOPT_SOCKS5_AUTH: %lu\n",
auth);
if(!(auth & CURLAUTH_BASIC))
/* disable username/password auth */
proxy_user = NULL;
#if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
if(auth & CURLAUTH_GSSAPI)
allow_gssapi = TRUE;
#endif
idx = 0;
socksreq[idx++] = 5; /* version */
idx++; /* reserve for the number of authentication methods */
socksreq[idx++] = 0; /* no authentication */
#if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
socksreq[idx++] = 1; /* GSS-API */
#endif
if(allow_gssapi)
socksreq[idx++] = 1; /* GSS-API */
if(proxy_user)
socksreq[idx++] = 2; /* username/password */
/* write the number of authentication methods */
@ -485,7 +498,7 @@ CURLcode Curl_SOCKS5(const char *proxy_user,
;
}
#if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
else if(socksreq[1] == 1) {
else if(allow_gssapi && (socksreq[1] == 1)) {
code = Curl_SOCKS5_gssapi_negotiate(sockindex, conn);
if(code) {
failf(data, "Unable to negotiate SOCKS5 GSS-API context.");
@ -546,16 +559,12 @@ CURLcode Curl_SOCKS5(const char *proxy_user,
}
else {
/* error */
#if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
if(socksreq[1] == 255) {
#else
if(socksreq[1] == 1) {
if(!allow_gssapi && (socksreq[1] == 1)) {
failf(data,
"SOCKS5 GSSAPI per-message authentication is not supported.");
return CURLE_COULDNT_CONNECT;
}
if(socksreq[1] == 255) {
#endif
if(!proxy_user || !*proxy_user) {
failf(data,
"No authentication method was acceptable. (It is quite likely"

8
lib/url.c
View File

@ -545,6 +545,9 @@ CURLcode Curl_init_userdefined(struct UserDefined *set)
set->httpauth = CURLAUTH_BASIC; /* defaults to basic */
set->proxyauth = CURLAUTH_BASIC; /* defaults to basic */
/* SOCKS5 proxy auth defaults to username/password + GSS-API */
set->socks5auth = CURLAUTH_BASIC | CURLAUTH_GSSAPI;
/* make libcurl quiet by default: */
set->hide_progress = TRUE; /* CURLOPT_NOPROGRESS changes these */
@ -1541,6 +1544,11 @@ CURLcode Curl_setopt(struct Curl_easy *data, CURLoption option,
break;
#endif /* CURL_DISABLE_PROXY */
case CURLOPT_SOCKS5_AUTH:
data->set.socks5auth = va_arg(param, unsigned long);
if(data->set.socks5auth & ~(CURLAUTH_BASIC | CURLAUTH_GSSAPI))
result = CURLE_NOT_BUILT_IN;
break;
#if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
case CURLOPT_SOCKS5_GSSAPI_NEC:
/*

1
lib/urldata.h
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@ -1615,6 +1615,7 @@ struct UserDefined {
long use_port; /* which port to use (when not using default) */
unsigned long httpauth; /* kind of HTTP authentication to use (bitmask) */
unsigned long proxyauth; /* kind of proxy authentication to use (bitmask) */
unsigned long socks5auth;/* kind of SOCKS5 authentication to use (bitmask) */
long followlocation; /* as in HTTP Location: */
long maxredirs; /* maximum no. of http(s) redirects to follow, set to -1
for infinity */